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xfrm: do the garbage collection after flushing policy
[mirror_ubuntu-artful-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
42a7b32b
DA		 119static inline struct dst_entry *__xfrm_dst_lookup(struct net *net,
120 int tos, int oif,
6418c4e0
DM		 121 const xfrm_address_t *saddr,
122 const xfrm_address_t *daddr,
9bb182a7
YH		 123 int family)
124{
37b10383 125 const struct xfrm_policy_afinfo *afinfo;
9bb182a7
YH		 126 struct dst_entry *dst;
127
128 afinfo = xfrm_policy_get_afinfo(family);
129 if (unlikely(afinfo == NULL))
130 return ERR_PTR(-EAFNOSUPPORT);
131
42a7b32b 132 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
9bb182a7 133
bdba9fe0 134 rcu_read_unlock();
9bb182a7
YH		 135
136 return dst;
137}
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
da7c224b 1800#ifdef CONFIG_XFRM_SUB_POLICY
be7928d2 1801static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
157bfc25
MN		 1802{
1803 if (!*target) {
1804 *target = kmalloc(size, GFP_ATOMIC);
1805 if (!*target)
1806 return -ENOMEM;
1807 }
be7928d2 1808
157bfc25
MN		 1809 memcpy(*target, src, size);
1810 return 0;
1811}
da7c224b 1812#endif
157bfc25 1813
be7928d2
DB		 1814static int xfrm_dst_update_parent(struct dst_entry *dst,
1815 const struct xfrm_selector *sel)
157bfc25
MN		 1816{
1817#ifdef CONFIG_XFRM_SUB_POLICY
1818 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1819 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1820 sel, sizeof(*sel));
1821#else
1822 return 0;
1823#endif
1824}
1825
be7928d2
DB		 1826static int xfrm_dst_update_origin(struct dst_entry *dst,
1827 const struct flowi *fl)
157bfc25
MN		 1828{
1829#ifdef CONFIG_XFRM_SUB_POLICY
1830 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1831 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1832#else
1833 return 0;
1834#endif
1835}
1da177e4 1836
73ff93cd 1837static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1838 struct xfrm_policy **pols,
1839 int *num_pols, int *num_xfrms)
1840{
1841 int i;
1842
1843 if (*num_pols == 0 || !pols[0]) {
1844 *num_pols = 0;
1845 *num_xfrms = 0;
1846 return 0;
1847 }
1848 if (IS_ERR(pols[0]))
1849 return PTR_ERR(pols[0]);
1850
1851 *num_xfrms = pols[0]->xfrm_nr;
1852
1853#ifdef CONFIG_XFRM_SUB_POLICY
1854 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1855 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1856 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1857 XFRM_POLICY_TYPE_MAIN,
1858 fl, family,
1859 XFRM_POLICY_OUT);
1860 if (pols[1]) {
1861 if (IS_ERR(pols[1])) {
1862 xfrm_pols_put(pols, *num_pols);
1863 return PTR_ERR(pols[1]);
1864 }
02d0892f 1865 (*num_pols)++;
80c802f3
TT		 1866 (*num_xfrms) += pols[1]->xfrm_nr;
1867 }
1868 }
1869#endif
1870 for (i = 0; i < *num_pols; i++) {
1871 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1872 *num_xfrms = -1;
1873 break;
1874 }
1875 }
1876
1877 return 0;
1878
1879}
1880
1881static struct xfrm_dst *
1882xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1883 const struct flowi *fl, u16 family,
80c802f3
TT		 1884 struct dst_entry *dst_orig)
1885{
1886 struct net *net = xp_net(pols[0]);
1887 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1888 struct dst_entry *dst;
1889 struct xfrm_dst *xdst;
1890 int err;
1891
1892 /* Try to instantiate a bundle */
1893 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1894 if (err <= 0) {
1895 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1896 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1897 return ERR_PTR(err);
1898 }
1899
1900 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1901 if (IS_ERR(dst)) {
1902 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1903 return ERR_CAST(dst);
1904 }
1905
1906 xdst = (struct xfrm_dst *)dst;
1907 xdst->num_xfrms = err;
1908 if (num_pols > 1)
1909 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1910 else
1911 err = xfrm_dst_update_origin(dst, fl);
1912 if (unlikely(err)) {
1913 dst_free(dst);
1914 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1915 return ERR_PTR(err);
1916 }
1917
1918 xdst->num_pols = num_pols;
3e94c2dc 1919 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1920 xdst->policy_genid = atomic_read(&pols[0]->genid);
1921
1922 return xdst;
1923}
1924
a0073fe1
SK		 1925static void xfrm_policy_queue_process(unsigned long arg)
1926{
a0073fe1
SK		 1927 struct sk_buff *skb;
1928 struct sock *sk;
1929 struct dst_entry *dst;
a0073fe1 1930 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
3f5312ae 1931 struct net *net = xp_net(pol);
a0073fe1
SK		 1932 struct xfrm_policy_queue *pq = &pol->polq;
1933 struct flowi fl;
1934 struct sk_buff_head list;
1935
1936 spin_lock(&pq->hold_queue.lock);
1937 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1938 if (!skb) {
1939 spin_unlock(&pq->hold_queue.lock);
1940 goto out;
1941 }
a0073fe1
SK		 1942 dst = skb_dst(skb);
1943 sk = skb->sk;
1944 xfrm_decode_session(skb, &fl, dst->ops->family);
1945 spin_unlock(&pq->hold_queue.lock);
1946
1947 dst_hold(dst->path);
3f5312ae 1948 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
a0073fe1
SK		 1949 if (IS_ERR(dst))
1950 goto purge_queue;
1951
1952 if (dst->flags & DST_XFRM_QUEUE) {
1953 dst_release(dst);
1954
1955 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1956 goto purge_queue;
1957
1958 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1959 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1960 xfrm_pol_hold(pol);
1961 goto out;
a0073fe1
SK		 1962 }
1963
1964 dst_release(dst);
1965
1966 __skb_queue_head_init(&list);
1967
1968 spin_lock(&pq->hold_queue.lock);
1969 pq->timeout = 0;
1970 skb_queue_splice_init(&pq->hold_queue, &list);
1971 spin_unlock(&pq->hold_queue.lock);
1972
1973 while (!skb_queue_empty(&list)) {
1974 skb = __skb_dequeue(&list);
1975
1976 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1977 dst_hold(skb_dst(skb)->path);
3f5312ae 1978 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
a0073fe1 1979 if (IS_ERR(dst)) {
a0073fe1
SK		 1980 kfree_skb(skb);
1981 continue;
1982 }
1983
1984 nf_reset(skb);
1985 skb_dst_drop(skb);
1986 skb_dst_set(skb, dst);
1987
13206b6b 1988 dst_output(net, skb->sk, skb);
a0073fe1
SK		 1989 }
1990
e7d8f6cb
SK		 1991out:
1992 xfrm_pol_put(pol);
a0073fe1
SK		 1993 return;
1994
1995purge_queue:
1996 pq->timeout = 0;
1ee5e667 1997 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 1998 xfrm_pol_put(pol);
a0073fe1
SK		 1999}
2000
ede2059d 2001static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 2002{
2003 unsigned long sched_next;
2004 struct dst_entry *dst = skb_dst(skb);
2005 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 2006 struct xfrm_policy *pol = xdst->pols[0];
2007 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 2008
39bb5e62 2009 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 2010 kfree_skb(skb);
2011 return 0;
2012 }
a0073fe1
SK		 2013
2014 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
2015 kfree_skb(skb);
2016 return -EAGAIN;
2017 }
2018
2019 skb_dst_force(skb);
a0073fe1
SK		 2020
2021 spin_lock_bh(&pq->hold_queue.lock);
2022
2023 if (!pq->timeout)
2024 pq->timeout = XFRM_QUEUE_TMO_MIN;
2025
2026 sched_next = jiffies + pq->timeout;
2027
2028 if (del_timer(&pq->hold_timer)) {
2029 if (time_before(pq->hold_timer.expires, sched_next))
2030 sched_next = pq->hold_timer.expires;
e7d8f6cb 2031 xfrm_pol_put(pol);
a0073fe1
SK		 2032 }
2033
2034 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 2035 if (!mod_timer(&pq->hold_timer, sched_next))
2036 xfrm_pol_hold(pol);
a0073fe1
SK		 2037
2038 spin_unlock_bh(&pq->hold_queue.lock);
2039
2040 return 0;
2041}
2042
2043static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 2044 struct xfrm_flo *xflo,
a0073fe1
SK		 2045 const struct flowi *fl,
2046 int num_xfrms,
2047 u16 family)
2048{
2049 int err;
2050 struct net_device *dev;
b8c203b2 2051 struct dst_entry *dst;
a0073fe1
SK		 2052 struct dst_entry *dst1;
2053 struct xfrm_dst *xdst;
2054
2055 xdst = xfrm_alloc_dst(net, family);
2056 if (IS_ERR(xdst))
2057 return xdst;
2058
b8c203b2
SK		 2059 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2060 net->xfrm.sysctl_larval_drop ||
2061 num_xfrms <= 0)
a0073fe1
SK		 2062 return xdst;
2063
b8c203b2 2064 dst = xflo->dst_orig;
a0073fe1
SK		 2065 dst1 = &xdst->u.dst;
2066 dst_hold(dst);
2067 xdst->route = dst;
2068
2069 dst_copy_metrics(dst1, dst);
2070
2071 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2072 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2073 dst1->lastuse = jiffies;
2074
2075 dst1->input = dst_discard;
2076 dst1->output = xdst_queue_output;
2077
2078 dst_hold(dst);
2079 dst1->child = dst;
2080 dst1->path = dst;
2081
2082 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2083
2084 err = -ENODEV;
2085 dev = dst->dev;
2086 if (!dev)
2087 goto free_dst;
2088
2089 err = xfrm_fill_dst(xdst, dev, fl);
2090 if (err)
2091 goto free_dst;
2092
2093out:
2094 return xdst;
2095
2096free_dst:
2097 dst_release(dst1);
2098 xdst = ERR_PTR(err);
2099 goto out;
2100}
2101
80c802f3 2102static struct flow_cache_object *
dee9f4bc 2103xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 2104 struct flow_cache_object *oldflo, void *ctx)
2105{
b8c203b2 2106 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
80c802f3
TT		 2107 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2108 struct xfrm_dst *xdst, *new_xdst;
2109 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2110
2111 /* Check if the policies from old bundle are usable */
2112 xdst = NULL;
2113 if (oldflo) {
2114 xdst = container_of(oldflo, struct xfrm_dst, flo);
2115 num_pols = xdst->num_pols;
2116 num_xfrms = xdst->num_xfrms;
2117 pol_dead = 0;
2118 for (i = 0; i < num_pols; i++) {
2119 pols[i] = xdst->pols[i];
2120 pol_dead |= pols[i]->walk.dead;
2121 }
2122 if (pol_dead) {
2123 dst_free(&xdst->u.dst);
2124 xdst = NULL;
2125 num_pols = 0;
2126 num_xfrms = 0;
2127 oldflo = NULL;
2128 }
2129 }
2130
2131 /* Resolve policies to use if we couldn't get them from
2132 * previous cache entry */
2133 if (xdst == NULL) {
2134 num_pols = 1;
b5fb82c4
BZ		 2135 pols[0] = __xfrm_policy_lookup(net, fl, family,
2136 flow_to_policy_dir(dir));
80c802f3
TT		 2137 err = xfrm_expand_policies(fl, family, pols,
2138 &num_pols, &num_xfrms);
2139 if (err < 0)
2140 goto inc_error;
2141 if (num_pols == 0)
2142 return NULL;
2143 if (num_xfrms <= 0)
2144 goto make_dummy_bundle;
2145 }
2146
b8c203b2
SK		 2147 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2148 xflo->dst_orig);
80c802f3
TT		 2149 if (IS_ERR(new_xdst)) {
2150 err = PTR_ERR(new_xdst);
2151 if (err != -EAGAIN)
2152 goto error;
2153 if (oldflo == NULL)
2154 goto make_dummy_bundle;
2155 dst_hold(&xdst->u.dst);
2156 return oldflo;
d809ec89
TT		 2157 } else if (new_xdst == NULL) {
2158 num_xfrms = 0;
2159 if (oldflo == NULL)
2160 goto make_dummy_bundle;
2161 xdst->num_xfrms = 0;
2162 dst_hold(&xdst->u.dst);
2163 return oldflo;
80c802f3
TT		 2164 }
2165
2166 /* Kill the previous bundle */
2167 if (xdst) {
2168 /* The policies were stolen for newly generated bundle */
2169 xdst->num_pols = 0;
2170 dst_free(&xdst->u.dst);
2171 }
2172
2173 /* Flow cache does not have reference, it dst_free()'s,
2174 * but we do need to return one reference for original caller */
2175 dst_hold(&new_xdst->u.dst);
2176 return &new_xdst->flo;
2177
2178make_dummy_bundle:
2179 /* We found policies, but there's no bundles to instantiate:
2180 * either because the policy blocks, has no transformations or
2181 * we could not build template (no xfrm_states).*/
b8c203b2 2182 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 2183 if (IS_ERR(xdst)) {
2184 xfrm_pols_put(pols, num_pols);
2185 return ERR_CAST(xdst);
2186 }
2187 xdst->num_pols = num_pols;
2188 xdst->num_xfrms = num_xfrms;
3e94c2dc 2189 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2190
2191 dst_hold(&xdst->u.dst);
2192 return &xdst->flo;
2193
2194inc_error:
2195 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2196error:
2197 if (xdst != NULL)
2198 dst_free(&xdst->u.dst);
2199 else
2200 xfrm_pols_put(pols, num_pols);
2201 return ERR_PTR(err);
2202}
1da177e4 2203
2774c131
DM		 2204static struct dst_entry *make_blackhole(struct net *net, u16 family,
2205 struct dst_entry *dst_orig)
2206{
37b10383 2207 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2774c131
DM		 2208 struct dst_entry *ret;
2209
2210 if (!afinfo) {
2211 dst_release(dst_orig);
433a1954 2212 return ERR_PTR(-EINVAL);
2774c131
DM		 2213 } else {
2214 ret = afinfo->blackhole_route(net, dst_orig);
2215 }
bdba9fe0 2216 rcu_read_unlock();
2774c131
DM		 2217
2218 return ret;
2219}
2220
1da177e4
LT		 2221/* Main function: finds/creates a bundle for given flow.
2222 *
2223 * At the moment we eat a raw IP route. Mostly to speed up lookups
2224 * on interfaces with disabled IPsec.
2225 */
452edd59
DM		 2226struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2227 const struct flowi *fl,
6f9c9615 2228 const struct sock *sk, int flags)
1da177e4 2229{
4e81bb83 2230 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2231 struct flow_cache_object *flo;
2232 struct xfrm_dst *xdst;
452edd59 2233 struct dst_entry *dst, *route;
80c802f3 2234 u16 family = dst_orig->ops->family;
df71837d 2235 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2236 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2237
80c802f3
TT		 2238 dst = NULL;
2239 xdst = NULL;
2240 route = NULL;
4e81bb83 2241
bd5eb35f 2242 sk = sk_const_to_full_sk(sk);
f7944fb1 2243 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3 2244 num_pols = 1;
4c86d777 2245 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
80c802f3
TT		 2246 err = xfrm_expand_policies(fl, family, pols,
2247 &num_pols, &num_xfrms);
2248 if (err < 0)
75b8c133 2249 goto dropdst;
80c802f3
TT		 2250
2251 if (num_pols) {
2252 if (num_xfrms <= 0) {
2253 drop_pols = num_pols;
2254 goto no_transform;
2255 }
2256
2257 xdst = xfrm_resolve_and_create_bundle(
2258 pols, num_pols, fl,
2259 family, dst_orig);
2260 if (IS_ERR(xdst)) {
2261 xfrm_pols_put(pols, num_pols);
2262 err = PTR_ERR(xdst);
2263 goto dropdst;
d809ec89
TT		 2264 } else if (xdst == NULL) {
2265 num_xfrms = 0;
2266 drop_pols = num_pols;
2267 goto no_transform;
80c802f3
TT		 2268 }
2269
b7eea454
SK		 2270 dst_hold(&xdst->u.dst);
2271 xdst->u.dst.flags |= DST_NOCACHE;
80c802f3 2272 route = xdst->route;
0aa64774 2273 }
3bccfbc7 2274 }
1da177e4 2275
80c802f3 2276 if (xdst == NULL) {
b8c203b2
SK		 2277 struct xfrm_flo xflo;
2278
2279 xflo.dst_orig = dst_orig;
2280 xflo.flags = flags;
2281
1da177e4 2282 /* To accelerate a bit... */
2518c7c2 2283 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2284 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2285 goto nopol;
1da177e4 2286
80c802f3 2287 flo = flow_cache_lookup(net, fl, family, dir,
b8c203b2 2288 xfrm_bundle_lookup, &xflo);
80c802f3
TT		 2289 if (flo == NULL)
2290 goto nopol;
fe1a5f03 2291 if (IS_ERR(flo)) {
80c802f3 2292 err = PTR_ERR(flo);
75b8c133 2293 goto dropdst;
d66e37a9 2294 }
80c802f3
TT		 2295 xdst = container_of(flo, struct xfrm_dst, flo);
2296
2297 num_pols = xdst->num_pols;
2298 num_xfrms = xdst->num_xfrms;
3e94c2dc 2299 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2300 route = xdst->route;
2301 }
2302
2303 dst = &xdst->u.dst;
2304 if (route == NULL && num_xfrms > 0) {
2305 /* The only case when xfrm_bundle_lookup() returns a
2306 * bundle with null route, is when the template could
2307 * not be resolved. It means policies are there, but
2308 * bundle could not be created, since we don't yet
2309 * have the xfrm_state's. We need to wait for KM to
2310 * negotiate new SA's or bail out with error.*/
2311 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2312 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 2313 err = -EREMOTE;
2314 goto error;
80c802f3 2315 }
80c802f3 2316
5b8ef341 2317 err = -EAGAIN;
80c802f3
TT		 2318
2319 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2320 goto error;
1da177e4
LT		 2321 }
2322
80c802f3
TT		 2323no_transform:
2324 if (num_pols == 0)
8b7817f3 2325 goto nopol;
1da177e4 2326
80c802f3
TT		 2327 if ((flags & XFRM_LOOKUP_ICMP) &&
2328 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2329 err = -ENOENT;
8b7817f3 2330 goto error;
80c802f3 2331 }
8b7817f3 2332
80c802f3
TT		 2333 for (i = 0; i < num_pols; i++)
2334 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2335
80c802f3 2336 if (num_xfrms < 0) {
1da177e4 2337 /* Prohibit the flow */
59c9940e 2338 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2339 err = -EPERM;
2340 goto error;
80c802f3
TT		 2341 } else if (num_xfrms > 0) {
2342 /* Flow transformed */
80c802f3
TT		 2343 dst_release(dst_orig);
2344 } else {
2345 /* Flow passes untransformed */
2346 dst_release(dst);
452edd59 2347 dst = dst_orig;
1da177e4 2348 }
80c802f3
TT		 2349ok:
2350 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2351 if (dst && dst->xfrm &&
2352 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2353 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2354 return dst;
1da177e4 2355
80c802f3 2356nopol:
452edd59
DM		 2357 if (!(flags & XFRM_LOOKUP_ICMP)) {
2358 dst = dst_orig;
80c802f3 2359 goto ok;
452edd59 2360 }
80c802f3 2361 err = -ENOENT;
1da177e4 2362error:
80c802f3 2363 dst_release(dst);
75b8c133 2364dropdst:
ac37e251
W		 2365 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2366 dst_release(dst_orig);
80c802f3 2367 xfrm_pols_put(pols, drop_pols);
452edd59 2368 return ERR_PTR(err);
1da177e4
LT		 2369}
2370EXPORT_SYMBOL(xfrm_lookup);
2371
f92ee619
SK		 2372/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2373 * Otherwise we may send out blackholed packets.
2374 */
2375struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2376 const struct flowi *fl,
6f9c9615 2377 const struct sock *sk, int flags)
f92ee619 2378{
b8c203b2 2379 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 2380 flags | XFRM_LOOKUP_QUEUE |
2381 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619
SK		 2382
2383 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2384 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2385
2386 return dst;
2387}
2388EXPORT_SYMBOL(xfrm_lookup_route);
2389
df0ba92a 2390static inline int
8f029de2 2391xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2392{
2393 struct xfrm_state *x;
df0ba92a
MN		 2394
2395 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2396 return 0;
2397 x = skb->sp->xvec[idx];
2398 if (!x->type->reject)
2399 return 0;
1ecafede 2400 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2401}
2402
1da177e4
LT		 2403/* When skb is transformed back to its "native" form, we have to
2404 * check policy restrictions. At the moment we make this in maximally
2405 * stupid way. Shame on me. :-) Of course, connected sockets must
2406 * have policy cached at them.
2407 */
2408
2409static inline int
7db454b9 2410xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2411 unsigned short family)
2412{
2413 if (xfrm_state_kern(x))
928ba416 2414 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2415 return x->id.proto == tmpl->id.proto &&
2416 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2417 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2418 x->props.mode == tmpl->mode &&
c5d18e98 2419 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2420 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2421 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2422 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2423}
2424
df0ba92a
MN		 2425/*
2426 * 0 or more than 0 is returned when validation is succeeded (either bypass
2427 * because of optional transport mode, or next index of the mathced secpath
2428 * state with the template.
2429 * -1 is returned when no matching template is found.
2430 * Otherwise "-2 - errored_index" is returned.
2431 */
1da177e4 2432static inline int
22cccb7e 2433xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2434 unsigned short family)
2435{
2436 int idx = start;
2437
2438 if (tmpl->optional) {
7e49e6de 2439 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2440 return start;
2441 } else
2442 start = -1;
2443 for (; idx < sp->len; idx++) {
dbe5b4aa 2444 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2445 return ++idx;
df0ba92a
MN		 2446 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2447 if (start == -1)
2448 start = -2-idx;
1da177e4 2449 break;
df0ba92a 2450 }
1da177e4
LT		 2451 }
2452 return start;
2453}
2454
d5422efe
HX		 2455int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2456 unsigned int family, int reverse)
1da177e4 2457{
37b10383 2458 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2459 int err;
1da177e4
LT		 2460
2461 if (unlikely(afinfo == NULL))
2462 return -EAFNOSUPPORT;
2463
d5422efe 2464 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2465 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
bdba9fe0 2466 rcu_read_unlock();
e0d1caa7 2467 return err;
1da177e4 2468}
d5422efe 2469EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2470
9a7386ec 2471static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2472{
2473 for (; k < sp->len; k++) {
df0ba92a 2474 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2475 *idxp = k;
1da177e4 2476 return 1;
df0ba92a 2477 }
1da177e4
LT		 2478 }
2479
2480 return 0;
2481}
2482
a716c119 2483int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2484 unsigned short family)
2485{
f6e1e25d 2486 struct net *net = dev_net(skb->dev);
1da177e4 2487 struct xfrm_policy *pol;
4e81bb83
MN		 2488 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2489 int npols = 0;
2490 int xfrm_nr;
2491 int pi;
d5422efe 2492 int reverse;
1da177e4 2493 struct flowi fl;
d5422efe 2494 u8 fl_dir;
df0ba92a 2495 int xerr_idx = -1;
1da177e4 2496
d5422efe
HX		 2497 reverse = dir & ~XFRM_POLICY_MASK;
2498 dir &= XFRM_POLICY_MASK;
2499 fl_dir = policy_to_flow_dir(dir);
2500
0aa64774 2501 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2502 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2503 return 0;
0aa64774
MN		 2504 }
2505
eb9c7ebe 2506 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2507
2508 /* First, check used SA against their selectors. */
2509 if (skb->sp) {
2510 int i;
2511
9b7a787d 2512 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2513 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2514 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2515 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2516 return 0;
0aa64774 2517 }
1da177e4
LT		 2518 }
2519 }
2520
2521 pol = NULL;
bd5eb35f 2522 sk = sk_to_full_sk(sk);
3bccfbc7 2523 if (sk && sk->sk_policy[dir]) {
4c86d777 2524 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
0aa64774 2525 if (IS_ERR(pol)) {
59c9940e 2526 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2527 return 0;
0aa64774 2528 }
3bccfbc7 2529 }
1da177e4 2530
fe1a5f03
TT		 2531 if (!pol) {
2532 struct flow_cache_object *flo;
2533
2534 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2535 xfrm_policy_lookup, NULL);
2536 if (IS_ERR_OR_NULL(flo))
2537 pol = ERR_CAST(flo);
2538 else
2539 pol = container_of(flo, struct xfrm_policy, flo);
2540 }
1da177e4 2541
0aa64774 2542 if (IS_ERR(pol)) {
59c9940e 2543 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2544 return 0;
0aa64774 2545 }
134b0fc5 2546
df0ba92a 2547 if (!pol) {
d1d9facf 2548 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2549 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2550 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2551 return 0;
2552 }
2553 return 1;
2554 }
1da177e4 2555
9d729f72 2556 pol->curlft.use_time = get_seconds();
1da177e4 2557
4e81bb83 2558 pols[0] = pol;
02d0892f 2559 npols++;
4e81bb83
MN		 2560#ifdef CONFIG_XFRM_SUB_POLICY
2561 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2562 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2563 &fl, family,
2564 XFRM_POLICY_IN);
2565 if (pols[1]) {
0aa64774 2566 if (IS_ERR(pols[1])) {
59c9940e 2567 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2568 return 0;
0aa64774 2569 }
9d729f72 2570 pols[1]->curlft.use_time = get_seconds();
02d0892f 2571 npols++;
4e81bb83
MN		 2572 }
2573 }
2574#endif
2575
1da177e4
LT		 2576 if (pol->action == XFRM_POLICY_ALLOW) {
2577 struct sec_path *sp;
2578 static struct sec_path dummy;
4e81bb83 2579 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2580 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2581 struct xfrm_tmpl **tpp = tp;
2582 int ti = 0;
1da177e4
LT		 2583 int i, k;
2584
2585 if ((sp = skb->sp) == NULL)
2586 sp = &dummy;
2587
4e81bb83
MN		 2588 for (pi = 0; pi < npols; pi++) {
2589 if (pols[pi] != pol &&
0aa64774 2590 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2591 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2592 goto reject;
0aa64774
MN		 2593 }
2594 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2595 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2596 goto reject_error;
0aa64774 2597 }
4e81bb83
MN		 2598 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2599 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2600 }
2601 xfrm_nr = ti;
41a49cc3 2602 if (npols > 1) {
283bc9f3 2603 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2604 tpp = stp;
2605 }
4e81bb83 2606
1da177e4
LT		 2607 /* For each tunnel xfrm, find the first matching tmpl.
2608 * For each tmpl before that, find corresponding xfrm.
2609 * Order is _important_. Later we will implement
2610 * some barriers, but at the moment barriers
2611 * are implied between each two transformations.
2612 */
4e81bb83
MN		 2613 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2614 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2615 if (k < 0) {
d1d9facf
JM		 2616 if (k < -1)
2617 /* "-2 - errored_index" returned */
2618 xerr_idx = -(2+k);
59c9940e 2619 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2620 goto reject;
df0ba92a 2621 }
1da177e4
LT		 2622 }
2623
0aa64774 2624 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2625 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2626 goto reject;
0aa64774 2627 }
1da177e4 2628
4e81bb83 2629 xfrm_pols_put(pols, npols);
1da177e4
LT		 2630 return 1;
2631 }
59c9940e 2632 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2633
2634reject:
df0ba92a 2635 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2636reject_error:
2637 xfrm_pols_put(pols, npols);
1da177e4
LT		 2638 return 0;
2639}
2640EXPORT_SYMBOL(__xfrm_policy_check);
2641
2642int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2643{
99a66657 2644 struct net *net = dev_net(skb->dev);
1da177e4 2645 struct flowi fl;
adf30907 2646 struct dst_entry *dst;
73137147 2647 int res = 1;
1da177e4 2648
0aa64774 2649 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2650 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2651 return 0;
0aa64774 2652 }
1da177e4 2653
fafeeb6c 2654 skb_dst_force(skb);
adf30907 2655
b8c203b2 2656 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 2657 if (IS_ERR(dst)) {
73137147 2658 res = 0;
452edd59
DM		 2659 dst = NULL;
2660 }
adf30907
ED		 2661 skb_dst_set(skb, dst);
2662 return res;
1da177e4
LT		 2663}
2664EXPORT_SYMBOL(__xfrm_route_forward);
2665
d49c73c7
DM		 2666/* Optimize later using cookies and generation ids. */
2667
1da177e4
LT		 2668static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2669{
d49c73c7 2670 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2671 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2672 * get validated by dst_ops->check on every use. We do this
2673 * because when a normal route referenced by an XFRM dst is
2674 * obsoleted we do not go looking around for all parent
2675 * referencing XFRM dsts so that we can invalidate them. It
2676 * is just too much work. Instead we make the checks here on
2677 * every use. For example:
d49c73c7
DM		 2678 *
2679 * XFRM dst A --> IPv4 dst X
2680 *
2681 * X is the "xdst->route" of A (X is also the "dst->path" of A
2682 * in this example). If X is marked obsolete, "A" will not
2683 * notice. That's what we are validating here via the
2684 * stale_bundle() check.
2685 *
2686 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2687 * dst which causes it's ->obsolete field to be set to
2688 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2689 * this, we want to force a new route lookup.
399c180a 2690 */
d49c73c7
DM		 2691 if (dst->obsolete < 0 && !stale_bundle(dst))
2692 return dst;
2693
1da177e4
LT		 2694 return NULL;
2695}
2696
2697static int stale_bundle(struct dst_entry *dst)
2698{
12fdb4d3 2699 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2700}
2701
aabc9761 2702void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2703{
1da177e4 2704 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2705 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2706 dev_hold(dst->dev);
1da177e4
LT		 2707 dev_put(dev);
2708 }
2709}
aabc9761 2710EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2711
2712static void xfrm_link_failure(struct sk_buff *skb)
2713{
2714 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2715}
2716
2717static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2718{
2719 if (dst) {
2720 if (dst->obsolete) {
2721 dst_release(dst);
2722 dst = NULL;
2723 }
2724 }
2725 return dst;
2726}
2727
e4c17216 2728void xfrm_garbage_collect(struct net *net)
c0ed1c14 2729{
ca925cf1 2730 flow_cache_flush(net);
c0ed1c14 2731}
e4c17216 2732EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14 2733
3d7d25a6 2734void xfrm_garbage_collect_deferred(struct net *net)
c0ed1c14 2735{
ca925cf1 2736 flow_cache_flush_deferred(net);
c0ed1c14 2737}
3d7d25a6 2738EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
c0ed1c14 2739
25ee3286 2740static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2741{
2742 do {
2743 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2744 u32 pmtu, route_mtu_cached;
2745
2746 pmtu = dst_mtu(dst->child);
2747 xdst->child_mtu_cached = pmtu;
2748
2749 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2750
2751 route_mtu_cached = dst_mtu(xdst->route);
2752 xdst->route_mtu_cached = route_mtu_cached;
2753
2754 if (pmtu > route_mtu_cached)
2755 pmtu = route_mtu_cached;
2756
defb3519 2757 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2758 } while ((dst = dst->next));
2759}
2760
1da177e4
LT		 2761/* Check that the bundle accepts the flow and its components are
2762 * still valid.
2763 */
2764
12fdb4d3 2765static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2766{
2767 struct dst_entry *dst = &first->u.dst;
2768 struct xfrm_dst *last;
2769 u32 mtu;
2770
92d63dec 2771 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2772 (dst->dev && !netif_running(dst->dev)))
2773 return 0;
2774
a0073fe1
SK		 2775 if (dst->flags & DST_XFRM_QUEUE)
2776 return 1;
2777
1da177e4
LT		 2778 last = NULL;
2779
2780 do {
2781 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2782
1da177e4
LT		 2783 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2784 return 0;
80c802f3
TT		 2785 if (xdst->xfrm_genid != dst->xfrm->genid)
2786 return 0;
b1312c89
TT		 2787 if (xdst->num_pols > 0 &&
2788 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2789 return 0;
e53820de 2790
1da177e4
LT		 2791 mtu = dst_mtu(dst->child);
2792 if (xdst->child_mtu_cached != mtu) {
2793 last = xdst;
2794 xdst->child_mtu_cached = mtu;
2795 }
2796
92d63dec 2797 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2798 return 0;
2799 mtu = dst_mtu(xdst->route);
2800 if (xdst->route_mtu_cached != mtu) {
2801 last = xdst;
2802 xdst->route_mtu_cached = mtu;
2803 }
2804
2805 dst = dst->child;
2806 } while (dst->xfrm);
2807
2808 if (likely(!last))
2809 return 1;
2810
2811 mtu = last->child_mtu_cached;
2812 for (;;) {
2813 dst = &last->u.dst;
2814
2815 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2816 if (mtu > last->route_mtu_cached)
2817 mtu = last->route_mtu_cached;
defb3519 2818 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2819
2820 if (last == first)
2821 break;
2822
bd0bf076 2823 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2824 last->child_mtu_cached = mtu;
2825 }
2826
2827 return 1;
2828}
2829
0dbaee3b
DM		 2830static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2831{
2832 return dst_metric_advmss(dst->path);
2833}
2834
ebb762f2 2835static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2836{
618f9bc7
SK		 2837 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2838
2839 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2840}
2841
1ecc9ad0
JA		 2842static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2843 const void *daddr)
63fca65d
JA		 2844{
2845 const struct dst_entry *path = dst->path;
2846
2847 for (; dst != path; dst = dst->child) {
2848 const struct xfrm_state *xfrm = dst->xfrm;
2849
2850 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2851 continue;
2852 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2853 daddr = xfrm->coaddr;
2854 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2855 daddr = &xfrm->id.daddr;
2856 }
1ecc9ad0
JA		 2857 return daddr;
2858}
2859
2860static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2861 struct sk_buff *skb,
2862 const void *daddr)
2863{
2864 const struct dst_entry *path = dst->path;
2865
2866 if (!skb)
2867 daddr = xfrm_get_dst_nexthop(dst, daddr);
2868 return path->ops->neigh_lookup(path, skb, daddr);
2869}
2870
2871static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2872{
2873 const struct dst_entry *path = dst->path;
2874
2875 daddr = xfrm_get_dst_nexthop(dst, daddr);
63fca65d
JA		 2876 path->ops->confirm_neigh(path, daddr);
2877}
2878
a2817d8b 2879int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
1da177e4
LT		 2880{
2881 int err = 0;
a2817d8b
FW		 2882
2883 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
1da177e4 2884 return -EAFNOSUPPORT;
a2817d8b 2885
ef8531b6 2886 spin_lock(&xfrm_policy_afinfo_lock);
a2817d8b 2887 if (unlikely(xfrm_policy_afinfo[family] != NULL))
f31e8d4f 2888 err = -EEXIST;
1da177e4
LT		 2889 else {
2890 struct dst_ops *dst_ops = afinfo->dst_ops;
2891 if (likely(dst_ops->kmem_cachep == NULL))
2892 dst_ops->kmem_cachep = xfrm_dst_cache;
2893 if (likely(dst_ops->check == NULL))
2894 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2895 if (likely(dst_ops->default_advmss == NULL))
2896 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2897 if (likely(dst_ops->mtu == NULL))
2898 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2899 if (likely(dst_ops->negative_advice == NULL))
2900 dst_ops->negative_advice = xfrm_negative_advice;
2901 if (likely(dst_ops->link_failure == NULL))
2902 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2903 if (likely(dst_ops->neigh_lookup == NULL))
2904 dst_ops->neigh_lookup = xfrm_neigh_lookup;
63fca65d
JA		 2905 if (likely(!dst_ops->confirm_neigh))
2906 dst_ops->confirm_neigh = xfrm_confirm_neigh;
a2817d8b 2907 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
1da177e4 2908 }
ef8531b6 2909 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 2910
1da177e4
LT		 2911 return err;
2912}
2913EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2914
a2817d8b 2915void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
1da177e4 2916{
2b61997a 2917 struct dst_ops *dst_ops = afinfo->dst_ops;
a2817d8b 2918 int i;
2b61997a 2919
a2817d8b
FW		 2920 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2921 if (xfrm_policy_afinfo[i] != afinfo)
2922 continue;
2923 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2924 break;
ef8531b6 2925 }
ef8531b6 2926
2b61997a 2927 synchronize_rcu();
ef8531b6 2928
2b61997a
FW		 2929 dst_ops->kmem_cachep = NULL;
2930 dst_ops->check = NULL;
2931 dst_ops->negative_advice = NULL;
2932 dst_ops->link_failure = NULL;
1da177e4
LT		 2933}
2934EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2935
1da177e4
LT		 2936static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2937{
351638e7 2938 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
e9dc8653 2939
1da177e4
LT		 2940 switch (event) {
2941 case NETDEV_DOWN:
c0ed1c14 2942 xfrm_garbage_collect(dev_net(dev));
1da177e4
LT		 2943 }
2944 return NOTIFY_DONE;
2945}
2946
2947static struct notifier_block xfrm_dev_notifier = {
d5917a35 2948 .notifier_call = xfrm_dev_event,
1da177e4
LT		 2949};
2950
558f82ef 2951#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2952static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2953{
c68cd1a0 2954 int rv;
698365fa
WC		 2955 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2956 if (!net->mib.xfrm_statistics)
558f82ef 2957 return -ENOMEM;
c68cd1a0
AD		 2958 rv = xfrm_proc_init(net);
2959 if (rv < 0)
698365fa 2960 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 2961 return rv;
558f82ef 2962}
59c9940e
AD		 2963
2964static void xfrm_statistics_fini(struct net *net)
2965{
c68cd1a0 2966 xfrm_proc_fini(net);
698365fa 2967 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 2968}
2969#else
2970static int __net_init xfrm_statistics_init(struct net *net)
2971{
2972 return 0;
2973}
2974
2975static void xfrm_statistics_fini(struct net *net)
2976{
2977}
558f82ef
MN		 2978#endif
2979
d62ddc21 2980static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2981{
2518c7c2
DM		 2982 unsigned int hmask, sz;
2983 int dir;
2984
d62ddc21
AD		 2985 if (net_eq(net, &init_net))
2986 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2987 sizeof(struct xfrm_dst),
e5d679f3 2988 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2989 NULL);
1da177e4 2990
2518c7c2
DM		 2991 hmask = 8 - 1;
2992 sz = (hmask+1) * sizeof(struct hlist_head);
2993
93b851c1
AD		 2994 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2995 if (!net->xfrm.policy_byidx)
2996 goto out_byidx;
8100bea7 2997 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 2998
53c2e285 2999 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 3000 struct xfrm_policy_hash *htab;
3001
dc2caba7 3002 net->xfrm.policy_count[dir] = 0;
53c2e285 3003 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 3004 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 3005
a35f6c5d 3006 htab = &net->xfrm.policy_bydst[dir];
44e36b42 3007 htab->table = xfrm_hash_alloc(sz);
2518c7c2 3008 if (!htab->table)
a35f6c5d
AD		 3009 goto out_bydst;
3010 htab->hmask = hmask;
b58555f1
CG		 3011 htab->dbits4 = 32;
3012 htab->sbits4 = 32;
3013 htab->dbits6 = 128;
3014 htab->sbits6 = 128;
2518c7c2 3015 }
880a6fab
CG		 3016 net->xfrm.policy_hthresh.lbits4 = 32;
3017 net->xfrm.policy_hthresh.rbits4 = 32;
3018 net->xfrm.policy_hthresh.lbits6 = 128;
3019 net->xfrm.policy_hthresh.rbits6 = 128;
3020
3021 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 3022
adfcf0b2 3023 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 3024 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 3025 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21
AD		 3026 if (net_eq(net, &init_net))
3027 register_netdevice_notifier(&xfrm_dev_notifier);
3028 return 0;
93b851c1 3029
a35f6c5d
AD		 3030out_bydst:
3031 for (dir--; dir >= 0; dir--) {
3032 struct xfrm_policy_hash *htab;
3033
3034 htab = &net->xfrm.policy_bydst[dir];
3035 xfrm_hash_free(htab->table, sz);
3036 }
3037 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 3038out_byidx:
3039 return -ENOMEM;
d62ddc21
AD		 3040}
3041
3042static void xfrm_policy_fini(struct net *net)
3043{
93b851c1 3044 unsigned int sz;
8b18f8ea 3045 int dir;
93b851c1 3046
7c2776ee
AD		 3047 flush_work(&net->xfrm.policy_hash_work);
3048#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 3049 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 3050#endif
2e71029e 3051 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 3052
adfcf0b2 3053 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 3054
53c2e285 3055 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 3056 struct xfrm_policy_hash *htab;
3057
8b18f8ea 3058 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 3059
3060 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 3061 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 3062 WARN_ON(!hlist_empty(htab->table));
3063 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 3064 }
3065
8100bea7 3066 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 3067 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3068 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 3069}
3070
d62ddc21
AD		 3071static int __net_init xfrm_net_init(struct net *net)
3072{
3073 int rv;
3074
c282222a
FW		 3075 /* Initialize the per-net locks here */
3076 spin_lock_init(&net->xfrm.xfrm_state_lock);
3077 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3078 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3079
59c9940e
AD		 3080 rv = xfrm_statistics_init(net);
3081 if (rv < 0)
3082 goto out_statistics;
d62ddc21
AD		 3083 rv = xfrm_state_init(net);
3084 if (rv < 0)
3085 goto out_state;
3086 rv = xfrm_policy_init(net);
3087 if (rv < 0)
3088 goto out_policy;
b27aeadb
AD		 3089 rv = xfrm_sysctl_init(net);
3090 if (rv < 0)
3091 goto out_sysctl;
4a93f509
SK		 3092 rv = flow_cache_init(net);
3093 if (rv < 0)
3094 goto out;
283bc9f3 3095
d62ddc21
AD		 3096 return 0;
3097
4a93f509
SK		 3098out:
3099 xfrm_sysctl_fini(net);
b27aeadb
AD		 3100out_sysctl:
3101 xfrm_policy_fini(net);
d62ddc21
AD		 3102out_policy:
3103 xfrm_state_fini(net);
3104out_state:
59c9940e
AD		 3105 xfrm_statistics_fini(net);
3106out_statistics:
d62ddc21
AD		 3107 return rv;
3108}
3109
3110static void __net_exit xfrm_net_exit(struct net *net)
3111{
4a93f509 3112 flow_cache_fini(net);
b27aeadb 3113 xfrm_sysctl_fini(net);
d62ddc21
AD		 3114 xfrm_policy_fini(net);
3115 xfrm_state_fini(net);
59c9940e 3116 xfrm_statistics_fini(net);
d62ddc21
AD		 3117}
3118
3119static struct pernet_operations __net_initdata xfrm_net_ops = {
3120 .init = xfrm_net_init,
3121 .exit = xfrm_net_exit,
3122};
3123
1da177e4
LT		 3124void __init xfrm_init(void)
3125{
a4fc1bfc 3126 flow_cache_hp_init();
d62ddc21 3127 register_pernet_subsys(&xfrm_net_ops);
30846090 3128 seqcount_init(&xfrm_policy_hash_generation);
1da177e4
LT		 3129 xfrm_input_init();
3130}
3131
ab5f5e8b 3132#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 3133static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3134 struct audit_buffer *audit_buf)
ab5f5e8b 3135{
875179fa
PM		 3136 struct xfrm_sec_ctx *ctx = xp->security;
3137 struct xfrm_selector *sel = &xp->selector;
3138
3139 if (ctx)
ab5f5e8b 3140 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 3141 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 3142
9b7a787d 3143 switch (sel->family) {
ab5f5e8b 3144 case AF_INET:
21454aaa 3145 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 3146 if (sel->prefixlen_s != 32)
3147 audit_log_format(audit_buf, " src_prefixlen=%d",
3148 sel->prefixlen_s);
21454aaa 3149 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 3150 if (sel->prefixlen_d != 32)
3151 audit_log_format(audit_buf, " dst_prefixlen=%d",
3152 sel->prefixlen_d);
ab5f5e8b
JL		 3153 break;
3154 case AF_INET6:
5b095d98 3155 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3156 if (sel->prefixlen_s != 128)
3157 audit_log_format(audit_buf, " src_prefixlen=%d",
3158 sel->prefixlen_s);
5b095d98 3159 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3160 if (sel->prefixlen_d != 128)
3161 audit_log_format(audit_buf, " dst_prefixlen=%d",
3162 sel->prefixlen_d);
ab5f5e8b
JL		 3163 break;
3164 }
3165}
3166
2e71029e 3167void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 3168{
3169 struct audit_buffer *audit_buf;
ab5f5e8b 3170
afeb14b4 3171 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3172 if (audit_buf == NULL)
3173 return;
2e71029e 3174 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3175 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3176 xfrm_audit_common_policyinfo(xp, audit_buf);
3177 audit_log_end(audit_buf);
3178}
3179EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3180
68277acc 3181void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 3182 bool task_valid)
ab5f5e8b
JL		 3183{
3184 struct audit_buffer *audit_buf;
ab5f5e8b 3185
afeb14b4 3186 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3187 if (audit_buf == NULL)
3188 return;
2e71029e 3189 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3190 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3191 xfrm_audit_common_policyinfo(xp, audit_buf);
3192 audit_log_end(audit_buf);
3193}
3194EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3195#endif
3196
80c9abaa 3197#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3198static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3199 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3200{
3201 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3202 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3203 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3204 sel_cmp->family) &&
3205 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3206 sel_cmp->family) &&
80c9abaa
SS		 3207 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3208 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3209 return true;
80c9abaa
SS		 3210 }
3211 } else {
3212 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3213 return true;
80c9abaa
SS		 3214 }
3215 }
bc9b35ad 3216 return false;
80c9abaa
SS		 3217}
3218
3e94c2dc
WC		 3219static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3220 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3221{
3222 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3223 struct hlist_head *chain;
3224 u32 priority = ~0U;
3225
9d0380df 3226 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 3227 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3228 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3229 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3230 pol->type == type) {
3231 ret = pol;
3232 priority = ret->priority;
3233 break;
3234 }
3235 }
8d549c4f 3236 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3237 hlist_for_each_entry(pol, chain, bydst) {
8faf491e
LR		 3238 if ((pol->priority >= priority) && ret)
3239 break;
3240
80c9abaa 3241 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 3242 pol->type == type) {
80c9abaa
SS		 3243 ret = pol;
3244 break;
3245 }
3246 }
3247
586f2eb4 3248 xfrm_pol_hold(ret);
80c9abaa 3249
9d0380df 3250 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3251
3252 return ret;
3253}
3254
dd701754 3255static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3256{
3257 int match = 0;
3258
3259 if (t->mode == m->mode && t->id.proto == m->proto &&
3260 (m->reqid == 0 || t->reqid == m->reqid)) {
3261 switch (t->mode) {
3262 case XFRM_MODE_TUNNEL:
3263 case XFRM_MODE_BEET:
70e94e66
YH		 3264 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3265 m->old_family) &&
3266 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3267 m->old_family)) {
80c9abaa
SS		 3268 match = 1;
3269 }
3270 break;
3271 case XFRM_MODE_TRANSPORT:
3272 /* in case of transport mode, template does not store
3273 any IP addresses, hence we just compare mode and
3274 protocol */
3275 match = 1;
3276 break;
3277 default:
3278 break;
3279 }
3280 }
3281 return match;
3282}
3283
3284/* update endpoint address(es) of template(s) */
3285static int xfrm_policy_migrate(struct xfrm_policy *pol,
3286 struct xfrm_migrate *m, int num_migrate)
3287{
3288 struct xfrm_migrate *mp;
80c9abaa
SS		 3289 int i, j, n = 0;
3290
3291 write_lock_bh(&pol->lock);
12a169e7 3292 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3293 /* target policy has been deleted */
3294 write_unlock_bh(&pol->lock);
3295 return -ENOENT;
3296 }
3297
3298 for (i = 0; i < pol->xfrm_nr; i++) {
3299 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3300 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3301 continue;
3302 n++;
1bfcb10f
HX		 3303 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3304 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3305 continue;
3306 /* update endpoints */
3307 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3308 sizeof(pol->xfrm_vec[i].id.daddr));
3309 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3310 sizeof(pol->xfrm_vec[i].saddr));
3311 pol->xfrm_vec[i].encap_family = mp->new_family;
3312 /* flush bundles */
80c802f3 3313 atomic_inc(&pol->genid);
80c9abaa
SS		 3314 }
3315 }
3316
3317 write_unlock_bh(&pol->lock);
3318
3319 if (!n)
3320 return -ENODATA;
3321
3322 return 0;
3323}
3324
dd701754 3325static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3326{
3327 int i, j;
3328
3329 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3330 return -EINVAL;
3331
3332 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3333 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3334 m[i].old_family) &&
3335 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3336 m[i].old_family))
80c9abaa
SS		 3337 return -EINVAL;
3338 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3339 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3340 return -EINVAL;
3341
3342 /* check if there is any duplicated entry */
3343 for (j = i + 1; j < num_migrate; j++) {
3344 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3345 sizeof(m[i].old_daddr)) &&
3346 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3347 sizeof(m[i].old_saddr)) &&
3348 m[i].proto == m[j].proto &&
3349 m[i].mode == m[j].mode &&
3350 m[i].reqid == m[j].reqid &&
3351 m[i].old_family == m[j].old_family)
3352 return -EINVAL;
3353 }
3354 }
3355
3356 return 0;
3357}
3358
b4b7c0b3 3359int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3360 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3361 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3362{
3363 int i, err, nx_cur = 0, nx_new = 0;
3364 struct xfrm_policy *pol = NULL;
3365 struct xfrm_state *x, *xc;
3366 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3367 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3368 struct xfrm_migrate *mp;
3369
3370 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3371 goto out;
3372
3373 /* Stage 1 - find policy */
8d549c4f 3374 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3375 err = -ENOENT;
3376 goto out;
3377 }
3378
3379 /* Stage 2 - find and update state(s) */
3380 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3381 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3382 x_cur[nx_cur] = x;
3383 nx_cur++;
3384 if ((xc = xfrm_state_migrate(x, mp))) {
3385 x_new[nx_new] = xc;
3386 nx_new++;
3387 } else {
3388 err = -ENODATA;
3389 goto restore_state;
3390 }
3391 }
3392 }
3393
3394 /* Stage 3 - update policy */
3395 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3396 goto restore_state;
3397
3398 /* Stage 4 - delete old state(s) */
3399 if (nx_cur) {
3400 xfrm_states_put(x_cur, nx_cur);
3401 xfrm_states_delete(x_cur, nx_cur);
3402 }
3403
3404 /* Stage 5 - announce */
13c1d189 3405 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3406
3407 xfrm_pol_put(pol);
3408
3409 return 0;
3410out:
3411 return err;
3412
3413restore_state:
3414 if (pol)
3415 xfrm_pol_put(pol);
3416 if (nx_cur)
3417 xfrm_states_put(x_cur, nx_cur);
3418 if (nx_new)
3419 xfrm_states_delete(x_new, nx_new);
3420
3421 return err;
3422}
e610e679 3423EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3424#endif
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