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[mirror_ubuntu-bionic-kernel.git] / net / xfrm / xfrm_policy.c
CommitLineData
a716c119 1/*
1da177e4
LT		 2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
df71837d 13 *
1da177e4
LT		 14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT		 17#include <linux/slab.h>
18#include <linux/kmod.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/workqueue.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
6ce74ec7 29#include <net/flow.h>
1da177e4
LT		 30#include <net/xfrm.h>
31#include <net/ip.h>
558f82ef
MN		 32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
1da177e4 35
44e36b42
DM		 36#include "xfrm_hash.h"
37
a0073fe1
SK		 38#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
b8c203b2
SK		 42struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45};
46
418a99ac 47static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
37b10383 48static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
418a99ac 49 __read_mostly;
1da177e4 50
e18b890b 51static struct kmem_cache *xfrm_dst_cache __read_mostly;
30846090 52static __read_mostly seqcount_t xfrm_policy_hash_generation;
1da177e4 53
25ee3286 54static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 55static int stale_bundle(struct dst_entry *dst);
12fdb4d3 56static int xfrm_bundle_ok(struct xfrm_dst *xdst);
a0073fe1 57static void xfrm_policy_queue_process(unsigned long arg);
1da177e4 58
12bfa8bd 59static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
29fa0b30
WY		 60static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 int dir);
62
e37cc8ad
FW		 63static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
64{
65 return atomic_inc_not_zero(&policy->refcnt);
66}
67
bc9b35ad 68static inline bool
200ce96e 69__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 70{
7e1dc7b6
DM		 71 const struct flowi4 *fl4 = &fl->u.ip4;
72
26bff940
AD		 73 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
74 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 75 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
77 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
78 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 79}
80
bc9b35ad 81static inline bool
200ce96e 82__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 83{
7e1dc7b6
DM		 84 const struct flowi6 *fl6 = &fl->u.ip6;
85
86 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
87 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
88 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
89 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
90 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
91 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 92}
93
bc9b35ad
DM		 94bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
95 unsigned short family)
77681021
AM		 96{
97 switch (family) {
98 case AF_INET:
99 return __xfrm4_selector_match(sel, fl);
100 case AF_INET6:
101 return __xfrm6_selector_match(sel, fl);
102 }
bc9b35ad 103 return false;
77681021
AM		 104}
105
a2817d8b 106static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
ef8531b6 107{
a2817d8b 108 const struct xfrm_policy_afinfo *afinfo;
ef8531b6 109
a2817d8b 110 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
ef8531b6
ED		 111 return NULL;
112 rcu_read_lock();
113 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
114 if (unlikely(!afinfo))
115 rcu_read_unlock();
116 return afinfo;
117}
118
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);
4aa2e62c 1009 return err;
1da177e4
LT		 1010}
1011EXPORT_SYMBOL(xfrm_policy_flush);
1012
cdcbca7c 1013int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 1014 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 1015 void *data)
1016{
12a169e7
HX		 1017 struct xfrm_policy *pol;
1018 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 1019 int error = 0;
1020
1021 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1022 walk->type != XFRM_POLICY_TYPE_ANY)
1023 return -EINVAL;
1da177e4 1024
12a169e7 1025 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 1026 return 0;
1027
9d0380df 1028 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 1029 if (list_empty(&walk->walk.all))
cdcbca7c 1030 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7 1031 else
80077702
LR		 1032 x = list_first_entry(&walk->walk.all,
1033 struct xfrm_policy_walk_entry, all);
1034
cdcbca7c 1035 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 1036 if (x->dead)
4c563f76 1037 continue;
12a169e7
HX		 1038 pol = container_of(x, struct xfrm_policy, walk);
1039 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1040 walk->type != pol->type)
1041 continue;
1042 error = func(pol, xfrm_policy_id2dir(pol->index),
1043 walk->seq, data);
1044 if (error) {
1045 list_move_tail(&walk->walk.all, &x->all);
1046 goto out;
2518c7c2 1047 }
12a169e7 1048 walk->seq++;
1da177e4 1049 }
12a169e7 1050 if (walk->seq == 0) {
baf5d743
JHS		 1051 error = -ENOENT;
1052 goto out;
1053 }
12a169e7 1054 list_del_init(&walk->walk.all);
1da177e4 1055out:
9d0380df 1056 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1057 return error;
1058}
1059EXPORT_SYMBOL(xfrm_policy_walk);
1060
12a169e7
HX		 1061void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1062{
1063 INIT_LIST_HEAD(&walk->walk.all);
1064 walk->walk.dead = 1;
1065 walk->type = type;
1066 walk->seq = 0;
1067}
1068EXPORT_SYMBOL(xfrm_policy_walk_init);
1069
283bc9f3 1070void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 1071{
1072 if (list_empty(&walk->walk.all))
1073 return;
1074
9d0380df 1075 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 1076 list_del(&walk->walk.all);
9d0380df 1077 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 1078}
1079EXPORT_SYMBOL(xfrm_policy_walk_done);
1080
134b0fc5
JM		 1081/*
1082 * Find policy to apply to this flow.
1083 *
1084 * Returns 0 if policy found, else an -errno.
1085 */
f299d557
DM		 1086static int xfrm_policy_match(const struct xfrm_policy *pol,
1087 const struct flowi *fl,
2518c7c2 1088 u8 type, u16 family, int dir)
1da177e4 1089{
f299d557 1090 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 1091 int ret = -ESRCH;
1092 bool match;
1da177e4 1093
2518c7c2 1094 if (pol->family != family ||
1d28f42c 1095 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 1096 pol->type != type)
134b0fc5 1097 return ret;
1da177e4 1098
2518c7c2 1099 match = xfrm_selector_match(sel, fl, family);
134b0fc5 1100 if (match)
1d28f42c 1101 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 1102 dir);
2518c7c2 1103
134b0fc5 1104 return ret;
2518c7c2 1105}
1da177e4 1106
52479b62 1107static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 1108 const struct flowi *fl,
2518c7c2
DM		 1109 u16 family, u8 dir)
1110{
134b0fc5 1111 int err;
2518c7c2 1112 struct xfrm_policy *pol, *ret;
0b597e7e 1113 const xfrm_address_t *daddr, *saddr;
2518c7c2 1114 struct hlist_head *chain;
30846090
FW		 1115 unsigned int sequence;
1116 u32 priority;
df71837d 1117
2518c7c2
DM		 1118 daddr = xfrm_flowi_daddr(fl, family);
1119 saddr = xfrm_flowi_saddr(fl, family);
1120 if (unlikely(!daddr || !saddr))
1121 return NULL;
1122
a7c44247 1123 rcu_read_lock();
30846090
FW		 1124 retry:
1125 do {
1126 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1127 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1128 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1129
1130 priority = ~0U;
2518c7c2 1131 ret = NULL;
a5eefc1d 1132 hlist_for_each_entry_rcu(pol, chain, bydst) {
134b0fc5
JM		 1133 err = xfrm_policy_match(pol, fl, type, family, dir);
1134 if (err) {
1135 if (err == -ESRCH)
1136 continue;
1137 else {
1138 ret = ERR_PTR(err);
1139 goto fail;
1140 }
1141 } else {
2518c7c2 1142 ret = pol;
acba48e1 1143 priority = ret->priority;
2518c7c2
DM		 1144 break;
1145 }
1146 }
52479b62 1147 chain = &net->xfrm.policy_inexact[dir];
a5eefc1d 1148 hlist_for_each_entry_rcu(pol, chain, bydst) {
8faf491e
LR		 1149 if ((pol->priority >= priority) && ret)
1150 break;
1151
134b0fc5
JM		 1152 err = xfrm_policy_match(pol, fl, type, family, dir);
1153 if (err) {
1154 if (err == -ESRCH)
1155 continue;
1156 else {
1157 ret = ERR_PTR(err);
1158 goto fail;
1159 }
8faf491e 1160 } else {
acba48e1
DM		 1161 ret = pol;
1162 break;
1da177e4
LT		 1163 }
1164 }
586f2eb4 1165
30846090
FW		 1166 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1167 goto retry;
1168
e37cc8ad
FW		 1169 if (ret && !xfrm_pol_hold_rcu(ret))
1170 goto retry;
134b0fc5 1171fail:
a7c44247 1172 rcu_read_unlock();
4e81bb83 1173
2518c7c2 1174 return ret;
4e81bb83
MN		 1175}
1176
80c802f3 1177static struct xfrm_policy *
73ff93cd 1178__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1179{
1180#ifdef CONFIG_XFRM_SUB_POLICY
1181 struct xfrm_policy *pol;
1182
1183 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1184 if (pol != NULL)
1185 return pol;
1186#endif
1187 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1188}
1189
b5fb82c4
BZ		 1190static int flow_to_policy_dir(int dir)
1191{
1192 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1193 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1194 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1195 return dir;
1196
1197 switch (dir) {
1198 default:
1199 case FLOW_DIR_IN:
1200 return XFRM_POLICY_IN;
1201 case FLOW_DIR_OUT:
1202 return XFRM_POLICY_OUT;
1203 case FLOW_DIR_FWD:
1204 return XFRM_POLICY_FWD;
1205 }
1206}
1207
fe1a5f03 1208static struct flow_cache_object *
dee9f4bc 1209xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
fe1a5f03 1210 u8 dir, struct flow_cache_object *old_obj, void *ctx)
4e81bb83
MN		 1211{
1212 struct xfrm_policy *pol;
fe1a5f03
TT		 1213
1214 if (old_obj)
1215 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
4e81bb83 1216
b5fb82c4 1217 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
80c802f3 1218 if (IS_ERR_OR_NULL(pol))
fe1a5f03 1219 return ERR_CAST(pol);
fe1a5f03 1220
fe1a5f03
TT		 1221 /* Resolver returns two references:
1222 * one for cache and one for caller of flow_cache_lookup() */
1223 xfrm_pol_hold(pol);
1224
1225 return &pol->flo;
1da177e4
LT		 1226}
1227
df71837d
TJ		 1228static inline int policy_to_flow_dir(int dir)
1229{
1230 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH		 1231 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1232 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1233 return dir;
1234 switch (dir) {
1235 default:
1236 case XFRM_POLICY_IN:
1237 return FLOW_DIR_IN;
1238 case XFRM_POLICY_OUT:
1239 return FLOW_DIR_OUT;
1240 case XFRM_POLICY_FWD:
1241 return FLOW_DIR_FWD;
3ff50b79 1242 }
df71837d
TJ		 1243}
1244
6f9c9615 1245static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
4c86d777 1246 const struct flowi *fl, u16 family)
1da177e4
LT		 1247{
1248 struct xfrm_policy *pol;
1249
d188ba86 1250 rcu_read_lock();
ae33786f 1251 again:
d188ba86
ED		 1252 pol = rcu_dereference(sk->sk_policy[dir]);
1253 if (pol != NULL) {
4c86d777 1254 bool match = xfrm_selector_match(&pol->selector, fl, family);
a716c119 1255 int err = 0;
df71837d 1256
3bccfbc7 1257 if (match) {
34f8d884
JHS		 1258 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1259 pol = NULL;
1260 goto out;
1261 }
03e1ad7b 1262 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1263 fl->flowi_secid,
03e1ad7b 1264 policy_to_flow_dir(dir));
330e832a
FW		 1265 if (!err) {
1266 if (!xfrm_pol_hold_rcu(pol))
1267 goto again;
1268 } else if (err == -ESRCH) {
3bccfbc7 1269 pol = NULL;
330e832a 1270 } else {
3bccfbc7 1271 pol = ERR_PTR(err);
330e832a 1272 }
3bccfbc7 1273 } else
1da177e4
LT		 1274 pol = NULL;
1275 }
34f8d884 1276out:
d188ba86 1277 rcu_read_unlock();
1da177e4
LT		 1278 return pol;
1279}
1280
1281static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1282{
98806f75 1283 struct net *net = xp_net(pol);
4e81bb83 1284
98806f75 1285 list_add(&pol->walk.all, &net->xfrm.policy_all);
98806f75 1286 net->xfrm.policy_count[dir]++;
1da177e4
LT		 1287 xfrm_pol_hold(pol);
1288}
1289
1290static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1291 int dir)
1292{
98806f75
AD		 1293 struct net *net = xp_net(pol);
1294
53c2e285 1295 if (list_empty(&pol->walk.all))
2518c7c2 1296 return NULL;
1da177e4 1297
53c2e285
HX		 1298 /* Socket policies are not hashed. */
1299 if (!hlist_unhashed(&pol->bydst)) {
a5eefc1d 1300 hlist_del_rcu(&pol->bydst);
53c2e285
HX		 1301 hlist_del(&pol->byidx);
1302 }
1303
1304 list_del_init(&pol->walk.all);
98806f75 1305 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1306
1307 return pol;
1da177e4
LT		 1308}
1309
53c2e285
HX		 1310static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1311{
1312 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1313}
1314
1315static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1316{
1317 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1318}
1319
4666faab 1320int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1321{
283bc9f3
FD		 1322 struct net *net = xp_net(pol);
1323
9d0380df 1324 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1325 pol = __xfrm_policy_unlink(pol, dir);
9d0380df 1326 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1327 if (pol) {
1da177e4 1328 xfrm_policy_kill(pol);
4666faab 1329 return 0;
1da177e4 1330 }
4666faab 1331 return -ENOENT;
1da177e4 1332}
a70fcb0b 1333EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1334
1335int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1336{
1121994c 1337 struct net *net = xp_net(pol);
1da177e4
LT		 1338 struct xfrm_policy *old_pol;
1339
4e81bb83
MN		 1340#ifdef CONFIG_XFRM_SUB_POLICY
1341 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1342 return -EINVAL;
1343#endif
1344
9d0380df 1345 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
d188ba86
ED		 1346 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1347 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1da177e4 1348 if (pol) {
9d729f72 1349 pol->curlft.add_time = get_seconds();
e682adf0 1350 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
53c2e285 1351 xfrm_sk_policy_link(pol, dir);
1da177e4 1352 }
d188ba86 1353 rcu_assign_pointer(sk->sk_policy[dir], pol);
a0073fe1
SK		 1354 if (old_pol) {
1355 if (pol)
1356 xfrm_policy_requeue(old_pol, pol);
1357
ea2dea9d
TT		 1358 /* Unlinking succeeds always. This is the only function
1359 * allowed to delete or replace socket policy.
1360 */
53c2e285 1361 xfrm_sk_policy_unlink(old_pol, dir);
a0073fe1 1362 }
9d0380df 1363 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1364
1365 if (old_pol) {
1366 xfrm_policy_kill(old_pol);
1367 }
1368 return 0;
1369}
1370
d3e40a9f 1371static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1372{
0331b1f3 1373 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1374 struct net *net = xp_net(old);
1da177e4
LT		 1375
1376 if (newp) {
1377 newp->selector = old->selector;
03e1ad7b
PM		 1378 if (security_xfrm_policy_clone(old->security,
1379 &newp->security)) {
df71837d
TJ		 1380 kfree(newp);
1381 return NULL; /* ENOMEM */
1382 }
1da177e4
LT		 1383 newp->lft = old->lft;
1384 newp->curlft = old->curlft;
fb977e2c 1385 newp->mark = old->mark;
1da177e4
LT		 1386 newp->action = old->action;
1387 newp->flags = old->flags;
1388 newp->xfrm_nr = old->xfrm_nr;
1389 newp->index = old->index;
4e81bb83 1390 newp->type = old->type;
1da177e4
LT		 1391 memcpy(newp->xfrm_vec, old->xfrm_vec,
1392 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
9d0380df 1393 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
53c2e285 1394 xfrm_sk_policy_link(newp, dir);
9d0380df 1395 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1396 xfrm_pol_put(newp);
1397 }
1398 return newp;
1399}
1400
d188ba86 1401int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1da177e4 1402{
d188ba86
ED		 1403 const struct xfrm_policy *p;
1404 struct xfrm_policy *np;
1405 int i, ret = 0;
1406
1407 rcu_read_lock();
1408 for (i = 0; i < 2; i++) {
1409 p = rcu_dereference(osk->sk_policy[i]);
1410 if (p) {
1411 np = clone_policy(p, i);
1412 if (unlikely(!np)) {
1413 ret = -ENOMEM;
1414 break;
1415 }
1416 rcu_assign_pointer(sk->sk_policy[i], np);
1417 }
1418 }
1419 rcu_read_unlock();
1420 return ret;
1da177e4
LT		 1421}
1422
a1e59abf 1423static int
42a7b32b
DA		 1424xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1425 xfrm_address_t *remote, unsigned short family)
a1e59abf
PM		 1426{
1427 int err;
37b10383 1428 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
a1e59abf
PM		 1429
1430 if (unlikely(afinfo == NULL))
1431 return -EINVAL;
42a7b32b 1432 err = afinfo->get_saddr(net, oif, local, remote);
bdba9fe0 1433 rcu_read_unlock();
a1e59abf
PM		 1434 return err;
1435}
1436
1da177e4
LT		 1437/* Resolve list of templates for the flow, given policy. */
1438
1439static int
a6c2e611
DM		 1440xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1441 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1442{
fbda33b2 1443 struct net *net = xp_net(policy);
1da177e4
LT		 1444 int nx;
1445 int i, error;
1446 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1447 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1448 xfrm_address_t tmp;
1da177e4 1449
9b7a787d 1450 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4
LT		 1451 struct xfrm_state *x;
1452 xfrm_address_t *remote = daddr;
1453 xfrm_address_t *local = saddr;
1454 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1455
48b8d783
JK		 1456 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1457 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT		 1458 remote = &tmpl->id.daddr;
1459 local = &tmpl->saddr;
8444cf71 1460 if (xfrm_addr_any(local, tmpl->encap_family)) {
42a7b32b
DA		 1461 error = xfrm_get_saddr(net, fl->flowi_oif,
1462 &tmp, remote,
1463 tmpl->encap_family);
a1e59abf
PM		 1464 if (error)
1465 goto fail;
1466 local = &tmp;
1467 }
1da177e4
LT		 1468 }
1469
1470 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1471
1472 if (x && x->km.state == XFRM_STATE_VALID) {
1473 xfrm[nx++] = x;
1474 daddr = remote;
1475 saddr = local;
1476 continue;
1477 }
1478 if (x) {
1479 error = (x->km.state == XFRM_STATE_ERROR ?
1480 -EINVAL : -EAGAIN);
1481 xfrm_state_put(x);
42054569 1482 } else if (error == -ESRCH) {
a4322266 1483 error = -EAGAIN;
42054569 1484 }
1da177e4
LT		 1485
1486 if (!tmpl->optional)
1487 goto fail;
1488 }
1489 return nx;
1490
1491fail:
9b7a787d 1492 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1493 xfrm_state_put(xfrm[nx]);
1494 return error;
1495}
1496
4e81bb83 1497static int
a6c2e611
DM		 1498xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1499 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1500{
41a49cc3
MN		 1501 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1502 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1503 int cnx = 0;
1504 int error;
1505 int ret;
1506 int i;
1507
1508 for (i = 0; i < npols; i++) {
1509 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1510 error = -ENOBUFS;
1511 goto fail;
1512 }
41a49cc3
MN		 1513
1514 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1515 if (ret < 0) {
1516 error = ret;
1517 goto fail;
1518 } else
1519 cnx += ret;
1520 }
1521
41a49cc3
MN		 1522 /* found states are sorted for outbound processing */
1523 if (npols > 1)
1524 xfrm_state_sort(xfrm, tpp, cnx, family);
1525
4e81bb83
MN		 1526 return cnx;
1527
1528 fail:
9b7a787d 1529 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1530 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1531 return error;
1532
1533}
1534
f5e2bb4f 1535static int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286 1536{
37b10383 1537 const struct xfrm_policy_afinfo *afinfo;
f5e2bb4f 1538 int tos = 0;
1da177e4 1539
f5e2bb4f
FW		 1540 afinfo = xfrm_policy_get_afinfo(family);
1541 tos = afinfo ? afinfo->get_tos(fl) : 0;
25ee3286 1542
bdba9fe0 1543 rcu_read_unlock();
25ee3286
HX		 1544
1545 return tos;
1546}
1547
80c802f3
TT		 1548static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1549{
1550 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1551 struct dst_entry *dst = &xdst->u.dst;
1552
1553 if (xdst->route == NULL) {
1554 /* Dummy bundle - if it has xfrms we were not
1555 * able to build bundle as template resolution failed.
1556 * It means we need to try again resolving. */
1557 if (xdst->num_xfrms > 0)
1558 return NULL;
a0073fe1
SK		 1559 } else if (dst->flags & DST_XFRM_QUEUE) {
1560 return NULL;
80c802f3
TT		 1561 } else {
1562 /* Real bundle */
1563 if (stale_bundle(dst))
1564 return NULL;
1565 }
1566
1567 dst_hold(dst);
1568 return flo;
1569}
1570
1571static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1572{
1573 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1574 struct dst_entry *dst = &xdst->u.dst;
1575
1576 if (!xdst->route)
1577 return 0;
1578 if (stale_bundle(dst))
1579 return 0;
1580
1581 return 1;
1582}
1583
1584static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1585{
1586 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1587 struct dst_entry *dst = &xdst->u.dst;
1588
1589 dst_free(dst);
1590}
1591
1592static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1593 .get = xfrm_bundle_flo_get,
1594 .check = xfrm_bundle_flo_check,
1595 .delete = xfrm_bundle_flo_delete,
1596};
1597
d7c7544c 1598static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1599{
37b10383 1600 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1601 struct dst_ops *dst_ops;
25ee3286
HX		 1602 struct xfrm_dst *xdst;
1603
1604 if (!afinfo)
1605 return ERR_PTR(-EINVAL);
1606
d7c7544c
AD		 1607 switch (family) {
1608 case AF_INET:
1609 dst_ops = &net->xfrm.xfrm4_dst_ops;
1610 break;
dfd56b8b 1611#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1612 case AF_INET6:
1613 dst_ops = &net->xfrm.xfrm6_dst_ops;
1614 break;
1615#endif
1616 default:
1617 BUG();
1618 }
f5b0a874 1619 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
25ee3286 1620
d4cae562 1621 if (likely(xdst)) {
141e369d
SK		 1622 struct dst_entry *dst = &xdst->u.dst;
1623
1624 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
0b150932 1625 xdst->flo.ops = &xfrm_bundle_fc_ops;
d4cae562 1626 } else
0b150932 1627 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1628
bdba9fe0 1629 rcu_read_unlock();
d4cae562 1630
25ee3286
HX		 1631 return xdst;
1632}
1633
a1b05140
MN		 1634static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1635 int nfheader_len)
1636{
37b10383 1637 const struct xfrm_policy_afinfo *afinfo =
a1b05140
MN		 1638 xfrm_policy_get_afinfo(dst->ops->family);
1639 int err;
1640
1641 if (!afinfo)
1642 return -EINVAL;
1643
1644 err = afinfo->init_path(path, dst, nfheader_len);
1645
bdba9fe0 1646 rcu_read_unlock();
a1b05140
MN		 1647
1648 return err;
1649}
1650
87c1e12b 1651static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1652 const struct flowi *fl)
25ee3286 1653{
37b10383 1654 const struct xfrm_policy_afinfo *afinfo =
25ee3286
HX		 1655 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1656 int err;
1657
1658 if (!afinfo)
1da177e4 1659 return -EINVAL;
25ee3286 1660
87c1e12b 1661 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1662
bdba9fe0 1663 rcu_read_unlock();
25ee3286 1664
1da177e4
LT		 1665 return err;
1666}
1667
80c802f3 1668
25ee3286
HX		 1669/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1670 * all the metrics... Shortly, bundle a bundle.
1671 */
1672
1673static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1674 struct xfrm_state **xfrm, int nx,
98313ada 1675 const struct flowi *fl,
25ee3286
HX		 1676 struct dst_entry *dst)
1677{
d7c7544c 1678 struct net *net = xp_net(policy);
25ee3286
HX		 1679 unsigned long now = jiffies;
1680 struct net_device *dev;
43a4dea4 1681 struct xfrm_mode *inner_mode;
25ee3286
HX		 1682 struct dst_entry *dst_prev = NULL;
1683 struct dst_entry *dst0 = NULL;
1684 int i = 0;
1685 int err;
1686 int header_len = 0;
a1b05140 1687 int nfheader_len = 0;
25ee3286
HX		 1688 int trailer_len = 0;
1689 int tos;
1690 int family = policy->selector.family;
9bb182a7
YH		 1691 xfrm_address_t saddr, daddr;
1692
1693 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1694
1695 tos = xfrm_get_tos(fl, family);
25ee3286
HX		 1696
1697 dst_hold(dst);
1698
1699 for (; i < nx; i++) {
d7c7544c 1700 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1701 struct dst_entry *dst1 = &xdst->u.dst;
1702
1703 err = PTR_ERR(xdst);
1704 if (IS_ERR(xdst)) {
1705 dst_release(dst);
1706 goto put_states;
1707 }
1708
43a4dea4
SK		 1709 if (xfrm[i]->sel.family == AF_UNSPEC) {
1710 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1711 xfrm_af2proto(family));
1712 if (!inner_mode) {
1713 err = -EAFNOSUPPORT;
1714 dst_release(dst);
1715 goto put_states;
1716 }
1717 } else
1718 inner_mode = xfrm[i]->inner_mode;
1719
25ee3286
HX		 1720 if (!dst_prev)
1721 dst0 = dst1;
1722 else {
1723 dst_prev->child = dst_clone(dst1);
1724 dst1->flags |= DST_NOHASH;
1725 }
1726
1727 xdst->route = dst;
defb3519 1728 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1729
1730 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1731 family = xfrm[i]->props.family;
42a7b32b
DA		 1732 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1733 &saddr, &daddr, family);
25ee3286
HX		 1734 err = PTR_ERR(dst);
1735 if (IS_ERR(dst))
1736 goto put_states;
1737 } else
1738 dst_hold(dst);
1739
1740 dst1->xfrm = xfrm[i];
80c802f3 1741 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1742
f5b0a874 1743 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1744 dst1->flags |= DST_HOST;
1745 dst1->lastuse = now;
1746
1747 dst1->input = dst_discard;
43a4dea4 1748 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1749
1750 dst1->next = dst_prev;
1751 dst_prev = dst1;
1752
1753 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1754 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1755 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1756 trailer_len += xfrm[i]->props.trailer_len;
1757 }
1758
1759 dst_prev->child = dst;
1760 dst0->path = dst;
1761
1762 err = -ENODEV;
1763 dev = dst->dev;
1764 if (!dev)
1765 goto free_dst;
1766
a1b05140 1767 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1768 xfrm_init_pmtu(dst_prev);
1769
1770 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1771 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1772
87c1e12b 1773 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1774 if (err)
1775 goto free_dst;
1776
1777 dst_prev->header_len = header_len;
1778 dst_prev->trailer_len = trailer_len;
1779 header_len -= xdst->u.dst.xfrm->props.header_len;
1780 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1781 }
1782
1783out:
1784 return dst0;
1785
1786put_states:
1787 for (; i < nx; i++)
1788 xfrm_state_put(xfrm[i]);
1789free_dst:
1790 if (dst0)
1791 dst_free(dst0);
1792 dst0 = ERR_PTR(err);
1793 goto out;
1794}
1795
da7c224b 1796#ifdef CONFIG_XFRM_SUB_POLICY
be7928d2 1797static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
157bfc25
MN		 1798{
1799 if (!*target) {
1800 *target = kmalloc(size, GFP_ATOMIC);
1801 if (!*target)
1802 return -ENOMEM;
1803 }
be7928d2 1804
157bfc25
MN		 1805 memcpy(*target, src, size);
1806 return 0;
1807}
da7c224b 1808#endif
157bfc25 1809
be7928d2
DB		 1810static int xfrm_dst_update_parent(struct dst_entry *dst,
1811 const struct xfrm_selector *sel)
157bfc25
MN		 1812{
1813#ifdef CONFIG_XFRM_SUB_POLICY
1814 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1815 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1816 sel, sizeof(*sel));
1817#else
1818 return 0;
1819#endif
1820}
1821
be7928d2
DB		 1822static int xfrm_dst_update_origin(struct dst_entry *dst,
1823 const struct flowi *fl)
157bfc25
MN		 1824{
1825#ifdef CONFIG_XFRM_SUB_POLICY
1826 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1827 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1828#else
1829 return 0;
1830#endif
1831}
1da177e4 1832
73ff93cd 1833static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1834 struct xfrm_policy **pols,
1835 int *num_pols, int *num_xfrms)
1836{
1837 int i;
1838
1839 if (*num_pols == 0 || !pols[0]) {
1840 *num_pols = 0;
1841 *num_xfrms = 0;
1842 return 0;
1843 }
1844 if (IS_ERR(pols[0]))
1845 return PTR_ERR(pols[0]);
1846
1847 *num_xfrms = pols[0]->xfrm_nr;
1848
1849#ifdef CONFIG_XFRM_SUB_POLICY
1850 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1851 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1852 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1853 XFRM_POLICY_TYPE_MAIN,
1854 fl, family,
1855 XFRM_POLICY_OUT);
1856 if (pols[1]) {
1857 if (IS_ERR(pols[1])) {
1858 xfrm_pols_put(pols, *num_pols);
1859 return PTR_ERR(pols[1]);
1860 }
02d0892f 1861 (*num_pols)++;
80c802f3
TT		 1862 (*num_xfrms) += pols[1]->xfrm_nr;
1863 }
1864 }
1865#endif
1866 for (i = 0; i < *num_pols; i++) {
1867 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1868 *num_xfrms = -1;
1869 break;
1870 }
1871 }
1872
1873 return 0;
1874
1875}
1876
1877static struct xfrm_dst *
1878xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1879 const struct flowi *fl, u16 family,
80c802f3
TT		 1880 struct dst_entry *dst_orig)
1881{
1882 struct net *net = xp_net(pols[0]);
1883 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1884 struct dst_entry *dst;
1885 struct xfrm_dst *xdst;
1886 int err;
1887
1888 /* Try to instantiate a bundle */
1889 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1890 if (err <= 0) {
1891 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1892 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1893 return ERR_PTR(err);
1894 }
1895
1896 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1897 if (IS_ERR(dst)) {
1898 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1899 return ERR_CAST(dst);
1900 }
1901
1902 xdst = (struct xfrm_dst *)dst;
1903 xdst->num_xfrms = err;
1904 if (num_pols > 1)
1905 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1906 else
1907 err = xfrm_dst_update_origin(dst, fl);
1908 if (unlikely(err)) {
1909 dst_free(dst);
1910 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1911 return ERR_PTR(err);
1912 }
1913
1914 xdst->num_pols = num_pols;
3e94c2dc 1915 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1916 xdst->policy_genid = atomic_read(&pols[0]->genid);
1917
1918 return xdst;
1919}
1920
a0073fe1
SK		 1921static void xfrm_policy_queue_process(unsigned long arg)
1922{
a0073fe1
SK		 1923 struct sk_buff *skb;
1924 struct sock *sk;
1925 struct dst_entry *dst;
a0073fe1 1926 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
3f5312ae 1927 struct net *net = xp_net(pol);
a0073fe1
SK		 1928 struct xfrm_policy_queue *pq = &pol->polq;
1929 struct flowi fl;
1930 struct sk_buff_head list;
1931
1932 spin_lock(&pq->hold_queue.lock);
1933 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1934 if (!skb) {
1935 spin_unlock(&pq->hold_queue.lock);
1936 goto out;
1937 }
a0073fe1
SK		 1938 dst = skb_dst(skb);
1939 sk = skb->sk;
1940 xfrm_decode_session(skb, &fl, dst->ops->family);
1941 spin_unlock(&pq->hold_queue.lock);
1942
1943 dst_hold(dst->path);
3f5312ae 1944 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
a0073fe1
SK		 1945 if (IS_ERR(dst))
1946 goto purge_queue;
1947
1948 if (dst->flags & DST_XFRM_QUEUE) {
1949 dst_release(dst);
1950
1951 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1952 goto purge_queue;
1953
1954 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1955 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1956 xfrm_pol_hold(pol);
1957 goto out;
a0073fe1
SK		 1958 }
1959
1960 dst_release(dst);
1961
1962 __skb_queue_head_init(&list);
1963
1964 spin_lock(&pq->hold_queue.lock);
1965 pq->timeout = 0;
1966 skb_queue_splice_init(&pq->hold_queue, &list);
1967 spin_unlock(&pq->hold_queue.lock);
1968
1969 while (!skb_queue_empty(&list)) {
1970 skb = __skb_dequeue(&list);
1971
1972 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1973 dst_hold(skb_dst(skb)->path);
3f5312ae 1974 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
a0073fe1 1975 if (IS_ERR(dst)) {
a0073fe1
SK		 1976 kfree_skb(skb);
1977 continue;
1978 }
1979
1980 nf_reset(skb);
1981 skb_dst_drop(skb);
1982 skb_dst_set(skb, dst);
1983
13206b6b 1984 dst_output(net, skb->sk, skb);
a0073fe1
SK		 1985 }
1986
e7d8f6cb
SK		 1987out:
1988 xfrm_pol_put(pol);
a0073fe1
SK		 1989 return;
1990
1991purge_queue:
1992 pq->timeout = 0;
1ee5e667 1993 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 1994 xfrm_pol_put(pol);
a0073fe1
SK		 1995}
1996
ede2059d 1997static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 1998{
1999 unsigned long sched_next;
2000 struct dst_entry *dst = skb_dst(skb);
2001 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 2002 struct xfrm_policy *pol = xdst->pols[0];
2003 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 2004
39bb5e62 2005 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 2006 kfree_skb(skb);
2007 return 0;
2008 }
a0073fe1
SK		 2009
2010 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
2011 kfree_skb(skb);
2012 return -EAGAIN;
2013 }
2014
2015 skb_dst_force(skb);
a0073fe1
SK		 2016
2017 spin_lock_bh(&pq->hold_queue.lock);
2018
2019 if (!pq->timeout)
2020 pq->timeout = XFRM_QUEUE_TMO_MIN;
2021
2022 sched_next = jiffies + pq->timeout;
2023
2024 if (del_timer(&pq->hold_timer)) {
2025 if (time_before(pq->hold_timer.expires, sched_next))
2026 sched_next = pq->hold_timer.expires;
e7d8f6cb 2027 xfrm_pol_put(pol);
a0073fe1
SK		 2028 }
2029
2030 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 2031 if (!mod_timer(&pq->hold_timer, sched_next))
2032 xfrm_pol_hold(pol);
a0073fe1
SK		 2033
2034 spin_unlock_bh(&pq->hold_queue.lock);
2035
2036 return 0;
2037}
2038
2039static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 2040 struct xfrm_flo *xflo,
a0073fe1
SK		 2041 const struct flowi *fl,
2042 int num_xfrms,
2043 u16 family)
2044{
2045 int err;
2046 struct net_device *dev;
b8c203b2 2047 struct dst_entry *dst;
a0073fe1
SK		 2048 struct dst_entry *dst1;
2049 struct xfrm_dst *xdst;
2050
2051 xdst = xfrm_alloc_dst(net, family);
2052 if (IS_ERR(xdst))
2053 return xdst;
2054
b8c203b2
SK		 2055 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2056 net->xfrm.sysctl_larval_drop ||
2057 num_xfrms <= 0)
a0073fe1
SK		 2058 return xdst;
2059
b8c203b2 2060 dst = xflo->dst_orig;
a0073fe1
SK		 2061 dst1 = &xdst->u.dst;
2062 dst_hold(dst);
2063 xdst->route = dst;
2064
2065 dst_copy_metrics(dst1, dst);
2066
2067 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2068 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2069 dst1->lastuse = jiffies;
2070
2071 dst1->input = dst_discard;
2072 dst1->output = xdst_queue_output;
2073
2074 dst_hold(dst);
2075 dst1->child = dst;
2076 dst1->path = dst;
2077
2078 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2079
2080 err = -ENODEV;
2081 dev = dst->dev;
2082 if (!dev)
2083 goto free_dst;
2084
2085 err = xfrm_fill_dst(xdst, dev, fl);
2086 if (err)
2087 goto free_dst;
2088
2089out:
2090 return xdst;
2091
2092free_dst:
2093 dst_release(dst1);
2094 xdst = ERR_PTR(err);
2095 goto out;
2096}
2097
80c802f3 2098static struct flow_cache_object *
dee9f4bc 2099xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 2100 struct flow_cache_object *oldflo, void *ctx)
2101{
b8c203b2 2102 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
80c802f3
TT		 2103 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2104 struct xfrm_dst *xdst, *new_xdst;
2105 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2106
2107 /* Check if the policies from old bundle are usable */
2108 xdst = NULL;
2109 if (oldflo) {
2110 xdst = container_of(oldflo, struct xfrm_dst, flo);
2111 num_pols = xdst->num_pols;
2112 num_xfrms = xdst->num_xfrms;
2113 pol_dead = 0;
2114 for (i = 0; i < num_pols; i++) {
2115 pols[i] = xdst->pols[i];
2116 pol_dead |= pols[i]->walk.dead;
2117 }
2118 if (pol_dead) {
2119 dst_free(&xdst->u.dst);
2120 xdst = NULL;
2121 num_pols = 0;
2122 num_xfrms = 0;
2123 oldflo = NULL;
2124 }
2125 }
2126
2127 /* Resolve policies to use if we couldn't get them from
2128 * previous cache entry */
2129 if (xdst == NULL) {
2130 num_pols = 1;
b5fb82c4
BZ		 2131 pols[0] = __xfrm_policy_lookup(net, fl, family,
2132 flow_to_policy_dir(dir));
80c802f3
TT		 2133 err = xfrm_expand_policies(fl, family, pols,
2134 &num_pols, &num_xfrms);
2135 if (err < 0)
2136 goto inc_error;
2137 if (num_pols == 0)
2138 return NULL;
2139 if (num_xfrms <= 0)
2140 goto make_dummy_bundle;
2141 }
2142
b8c203b2
SK		 2143 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2144 xflo->dst_orig);
80c802f3
TT		 2145 if (IS_ERR(new_xdst)) {
2146 err = PTR_ERR(new_xdst);
2147 if (err != -EAGAIN)
2148 goto error;
2149 if (oldflo == NULL)
2150 goto make_dummy_bundle;
2151 dst_hold(&xdst->u.dst);
2152 return oldflo;
d809ec89
TT		 2153 } else if (new_xdst == NULL) {
2154 num_xfrms = 0;
2155 if (oldflo == NULL)
2156 goto make_dummy_bundle;
2157 xdst->num_xfrms = 0;
2158 dst_hold(&xdst->u.dst);
2159 return oldflo;
80c802f3
TT		 2160 }
2161
2162 /* Kill the previous bundle */
2163 if (xdst) {
2164 /* The policies were stolen for newly generated bundle */
2165 xdst->num_pols = 0;
2166 dst_free(&xdst->u.dst);
2167 }
2168
2169 /* Flow cache does not have reference, it dst_free()'s,
2170 * but we do need to return one reference for original caller */
2171 dst_hold(&new_xdst->u.dst);
2172 return &new_xdst->flo;
2173
2174make_dummy_bundle:
2175 /* We found policies, but there's no bundles to instantiate:
2176 * either because the policy blocks, has no transformations or
2177 * we could not build template (no xfrm_states).*/
b8c203b2 2178 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 2179 if (IS_ERR(xdst)) {
2180 xfrm_pols_put(pols, num_pols);
2181 return ERR_CAST(xdst);
2182 }
2183 xdst->num_pols = num_pols;
2184 xdst->num_xfrms = num_xfrms;
3e94c2dc 2185 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2186
2187 dst_hold(&xdst->u.dst);
2188 return &xdst->flo;
2189
2190inc_error:
2191 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2192error:
2193 if (xdst != NULL)
2194 dst_free(&xdst->u.dst);
2195 else
2196 xfrm_pols_put(pols, num_pols);
2197 return ERR_PTR(err);
2198}
1da177e4 2199
2774c131
DM		 2200static struct dst_entry *make_blackhole(struct net *net, u16 family,
2201 struct dst_entry *dst_orig)
2202{
37b10383 2203 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2774c131
DM		 2204 struct dst_entry *ret;
2205
2206 if (!afinfo) {
2207 dst_release(dst_orig);
433a1954 2208 return ERR_PTR(-EINVAL);
2774c131
DM		 2209 } else {
2210 ret = afinfo->blackhole_route(net, dst_orig);
2211 }
bdba9fe0 2212 rcu_read_unlock();
2774c131
DM		 2213
2214 return ret;
2215}
2216
1da177e4
LT		 2217/* Main function: finds/creates a bundle for given flow.
2218 *
2219 * At the moment we eat a raw IP route. Mostly to speed up lookups
2220 * on interfaces with disabled IPsec.
2221 */
452edd59
DM		 2222struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2223 const struct flowi *fl,
6f9c9615 2224 const struct sock *sk, int flags)
1da177e4 2225{
4e81bb83 2226 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2227 struct flow_cache_object *flo;
2228 struct xfrm_dst *xdst;
452edd59 2229 struct dst_entry *dst, *route;
80c802f3 2230 u16 family = dst_orig->ops->family;
df71837d 2231 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2232 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2233
80c802f3
TT		 2234 dst = NULL;
2235 xdst = NULL;
2236 route = NULL;
4e81bb83 2237
bd5eb35f 2238 sk = sk_const_to_full_sk(sk);
f7944fb1 2239 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3 2240 num_pols = 1;
4c86d777 2241 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
80c802f3
TT		 2242 err = xfrm_expand_policies(fl, family, pols,
2243 &num_pols, &num_xfrms);
2244 if (err < 0)
75b8c133 2245 goto dropdst;
80c802f3
TT		 2246
2247 if (num_pols) {
2248 if (num_xfrms <= 0) {
2249 drop_pols = num_pols;
2250 goto no_transform;
2251 }
2252
2253 xdst = xfrm_resolve_and_create_bundle(
2254 pols, num_pols, fl,
2255 family, dst_orig);
2256 if (IS_ERR(xdst)) {
2257 xfrm_pols_put(pols, num_pols);
2258 err = PTR_ERR(xdst);
2259 goto dropdst;
d809ec89
TT		 2260 } else if (xdst == NULL) {
2261 num_xfrms = 0;
2262 drop_pols = num_pols;
2263 goto no_transform;
80c802f3
TT		 2264 }
2265
b7eea454
SK		 2266 dst_hold(&xdst->u.dst);
2267 xdst->u.dst.flags |= DST_NOCACHE;
80c802f3 2268 route = xdst->route;
0aa64774 2269 }
3bccfbc7 2270 }
1da177e4 2271
80c802f3 2272 if (xdst == NULL) {
b8c203b2
SK		 2273 struct xfrm_flo xflo;
2274
2275 xflo.dst_orig = dst_orig;
2276 xflo.flags = flags;
2277
1da177e4 2278 /* To accelerate a bit... */
2518c7c2 2279 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2280 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2281 goto nopol;
1da177e4 2282
80c802f3 2283 flo = flow_cache_lookup(net, fl, family, dir,
b8c203b2 2284 xfrm_bundle_lookup, &xflo);
80c802f3
TT		 2285 if (flo == NULL)
2286 goto nopol;
fe1a5f03 2287 if (IS_ERR(flo)) {
80c802f3 2288 err = PTR_ERR(flo);
75b8c133 2289 goto dropdst;
d66e37a9 2290 }
80c802f3
TT		 2291 xdst = container_of(flo, struct xfrm_dst, flo);
2292
2293 num_pols = xdst->num_pols;
2294 num_xfrms = xdst->num_xfrms;
3e94c2dc 2295 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2296 route = xdst->route;
2297 }
2298
2299 dst = &xdst->u.dst;
2300 if (route == NULL && num_xfrms > 0) {
2301 /* The only case when xfrm_bundle_lookup() returns a
2302 * bundle with null route, is when the template could
2303 * not be resolved. It means policies are there, but
2304 * bundle could not be created, since we don't yet
2305 * have the xfrm_state's. We need to wait for KM to
2306 * negotiate new SA's or bail out with error.*/
2307 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2308 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 2309 err = -EREMOTE;
2310 goto error;
80c802f3 2311 }
80c802f3 2312
5b8ef341 2313 err = -EAGAIN;
80c802f3
TT		 2314
2315 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2316 goto error;
1da177e4
LT		 2317 }
2318
80c802f3
TT		 2319no_transform:
2320 if (num_pols == 0)
8b7817f3 2321 goto nopol;
1da177e4 2322
80c802f3
TT		 2323 if ((flags & XFRM_LOOKUP_ICMP) &&
2324 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2325 err = -ENOENT;
8b7817f3 2326 goto error;
80c802f3 2327 }
8b7817f3 2328
80c802f3
TT		 2329 for (i = 0; i < num_pols; i++)
2330 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2331
80c802f3 2332 if (num_xfrms < 0) {
1da177e4 2333 /* Prohibit the flow */
59c9940e 2334 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2335 err = -EPERM;
2336 goto error;
80c802f3
TT		 2337 } else if (num_xfrms > 0) {
2338 /* Flow transformed */
80c802f3
TT		 2339 dst_release(dst_orig);
2340 } else {
2341 /* Flow passes untransformed */
2342 dst_release(dst);
452edd59 2343 dst = dst_orig;
1da177e4 2344 }
80c802f3
TT		 2345ok:
2346 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2347 if (dst && dst->xfrm &&
2348 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2349 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2350 return dst;
1da177e4 2351
80c802f3 2352nopol:
452edd59
DM		 2353 if (!(flags & XFRM_LOOKUP_ICMP)) {
2354 dst = dst_orig;
80c802f3 2355 goto ok;
452edd59 2356 }
80c802f3 2357 err = -ENOENT;
1da177e4 2358error:
80c802f3 2359 dst_release(dst);
75b8c133 2360dropdst:
ac37e251
W		 2361 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2362 dst_release(dst_orig);
80c802f3 2363 xfrm_pols_put(pols, drop_pols);
452edd59 2364 return ERR_PTR(err);
1da177e4
LT		 2365}
2366EXPORT_SYMBOL(xfrm_lookup);
2367
f92ee619
SK		 2368/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2369 * Otherwise we may send out blackholed packets.
2370 */
2371struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2372 const struct flowi *fl,
6f9c9615 2373 const struct sock *sk, int flags)
f92ee619 2374{
b8c203b2 2375 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 2376 flags | XFRM_LOOKUP_QUEUE |
2377 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619
SK		 2378
2379 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2380 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2381
2382 return dst;
2383}
2384EXPORT_SYMBOL(xfrm_lookup_route);
2385
df0ba92a 2386static inline int
8f029de2 2387xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2388{
2389 struct xfrm_state *x;
df0ba92a
MN		 2390
2391 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2392 return 0;
2393 x = skb->sp->xvec[idx];
2394 if (!x->type->reject)
2395 return 0;
1ecafede 2396 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2397}
2398
1da177e4
LT		 2399/* When skb is transformed back to its "native" form, we have to
2400 * check policy restrictions. At the moment we make this in maximally
2401 * stupid way. Shame on me. :-) Of course, connected sockets must
2402 * have policy cached at them.
2403 */
2404
2405static inline int
7db454b9 2406xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2407 unsigned short family)
2408{
2409 if (xfrm_state_kern(x))
928ba416 2410 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2411 return x->id.proto == tmpl->id.proto &&
2412 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2413 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2414 x->props.mode == tmpl->mode &&
c5d18e98 2415 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2416 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2417 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2418 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2419}
2420
df0ba92a
MN		 2421/*
2422 * 0 or more than 0 is returned when validation is succeeded (either bypass
2423 * because of optional transport mode, or next index of the mathced secpath
2424 * state with the template.
2425 * -1 is returned when no matching template is found.
2426 * Otherwise "-2 - errored_index" is returned.
2427 */
1da177e4 2428static inline int
22cccb7e 2429xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2430 unsigned short family)
2431{
2432 int idx = start;
2433
2434 if (tmpl->optional) {
7e49e6de 2435 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2436 return start;
2437 } else
2438 start = -1;
2439 for (; idx < sp->len; idx++) {
dbe5b4aa 2440 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2441 return ++idx;
df0ba92a
MN		 2442 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2443 if (start == -1)
2444 start = -2-idx;
1da177e4 2445 break;
df0ba92a 2446 }
1da177e4
LT		 2447 }
2448 return start;
2449}
2450
d5422efe
HX		 2451int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2452 unsigned int family, int reverse)
1da177e4 2453{
37b10383 2454 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2455 int err;
1da177e4
LT		 2456
2457 if (unlikely(afinfo == NULL))
2458 return -EAFNOSUPPORT;
2459
d5422efe 2460 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2461 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
bdba9fe0 2462 rcu_read_unlock();
e0d1caa7 2463 return err;
1da177e4 2464}
d5422efe 2465EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2466
9a7386ec 2467static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2468{
2469 for (; k < sp->len; k++) {
df0ba92a 2470 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2471 *idxp = k;
1da177e4 2472 return 1;
df0ba92a 2473 }
1da177e4
LT		 2474 }
2475
2476 return 0;
2477}
2478
a716c119 2479int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2480 unsigned short family)
2481{
f6e1e25d 2482 struct net *net = dev_net(skb->dev);
1da177e4 2483 struct xfrm_policy *pol;
4e81bb83
MN		 2484 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2485 int npols = 0;
2486 int xfrm_nr;
2487 int pi;
d5422efe 2488 int reverse;
1da177e4 2489 struct flowi fl;
d5422efe 2490 u8 fl_dir;
df0ba92a 2491 int xerr_idx = -1;
1da177e4 2492
d5422efe
HX		 2493 reverse = dir & ~XFRM_POLICY_MASK;
2494 dir &= XFRM_POLICY_MASK;
2495 fl_dir = policy_to_flow_dir(dir);
2496
0aa64774 2497 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2498 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2499 return 0;
0aa64774
MN		 2500 }
2501
eb9c7ebe 2502 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2503
2504 /* First, check used SA against their selectors. */
2505 if (skb->sp) {
2506 int i;
2507
9b7a787d 2508 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2509 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2510 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2511 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2512 return 0;
0aa64774 2513 }
1da177e4
LT		 2514 }
2515 }
2516
2517 pol = NULL;
bd5eb35f 2518 sk = sk_to_full_sk(sk);
3bccfbc7 2519 if (sk && sk->sk_policy[dir]) {
4c86d777 2520 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
0aa64774 2521 if (IS_ERR(pol)) {
59c9940e 2522 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2523 return 0;
0aa64774 2524 }
3bccfbc7 2525 }
1da177e4 2526
fe1a5f03
TT		 2527 if (!pol) {
2528 struct flow_cache_object *flo;
2529
2530 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2531 xfrm_policy_lookup, NULL);
2532 if (IS_ERR_OR_NULL(flo))
2533 pol = ERR_CAST(flo);
2534 else
2535 pol = container_of(flo, struct xfrm_policy, flo);
2536 }
1da177e4 2537
0aa64774 2538 if (IS_ERR(pol)) {
59c9940e 2539 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2540 return 0;
0aa64774 2541 }
134b0fc5 2542
df0ba92a 2543 if (!pol) {
d1d9facf 2544 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2545 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2546 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2547 return 0;
2548 }
2549 return 1;
2550 }
1da177e4 2551
9d729f72 2552 pol->curlft.use_time = get_seconds();
1da177e4 2553
4e81bb83 2554 pols[0] = pol;
02d0892f 2555 npols++;
4e81bb83
MN		 2556#ifdef CONFIG_XFRM_SUB_POLICY
2557 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2558 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2559 &fl, family,
2560 XFRM_POLICY_IN);
2561 if (pols[1]) {
0aa64774 2562 if (IS_ERR(pols[1])) {
59c9940e 2563 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2564 return 0;
0aa64774 2565 }
9d729f72 2566 pols[1]->curlft.use_time = get_seconds();
02d0892f 2567 npols++;
4e81bb83
MN		 2568 }
2569 }
2570#endif
2571
1da177e4
LT		 2572 if (pol->action == XFRM_POLICY_ALLOW) {
2573 struct sec_path *sp;
2574 static struct sec_path dummy;
4e81bb83 2575 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2576 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2577 struct xfrm_tmpl **tpp = tp;
2578 int ti = 0;
1da177e4
LT		 2579 int i, k;
2580
2581 if ((sp = skb->sp) == NULL)
2582 sp = &dummy;
2583
4e81bb83
MN		 2584 for (pi = 0; pi < npols; pi++) {
2585 if (pols[pi] != pol &&
0aa64774 2586 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2587 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2588 goto reject;
0aa64774
MN		 2589 }
2590 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2591 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2592 goto reject_error;
0aa64774 2593 }
4e81bb83
MN		 2594 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2595 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2596 }
2597 xfrm_nr = ti;
41a49cc3 2598 if (npols > 1) {
283bc9f3 2599 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2600 tpp = stp;
2601 }
4e81bb83 2602
1da177e4
LT		 2603 /* For each tunnel xfrm, find the first matching tmpl.
2604 * For each tmpl before that, find corresponding xfrm.
2605 * Order is _important_. Later we will implement
2606 * some barriers, but at the moment barriers
2607 * are implied between each two transformations.
2608 */
4e81bb83
MN		 2609 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2610 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2611 if (k < 0) {
d1d9facf
JM		 2612 if (k < -1)
2613 /* "-2 - errored_index" returned */
2614 xerr_idx = -(2+k);
59c9940e 2615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2616 goto reject;
df0ba92a 2617 }
1da177e4
LT		 2618 }
2619
0aa64774 2620 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2621 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2622 goto reject;
0aa64774 2623 }
1da177e4 2624
4e81bb83 2625 xfrm_pols_put(pols, npols);
1da177e4
LT		 2626 return 1;
2627 }
59c9940e 2628 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2629
2630reject:
df0ba92a 2631 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2632reject_error:
2633 xfrm_pols_put(pols, npols);
1da177e4
LT		 2634 return 0;
2635}
2636EXPORT_SYMBOL(__xfrm_policy_check);
2637
2638int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2639{
99a66657 2640 struct net *net = dev_net(skb->dev);
1da177e4 2641 struct flowi fl;
adf30907 2642 struct dst_entry *dst;
73137147 2643 int res = 1;
1da177e4 2644
0aa64774 2645 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2646 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2647 return 0;
0aa64774 2648 }
1da177e4 2649
fafeeb6c 2650 skb_dst_force(skb);
adf30907 2651
b8c203b2 2652 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 2653 if (IS_ERR(dst)) {
73137147 2654 res = 0;
452edd59
DM		 2655 dst = NULL;
2656 }
adf30907
ED		 2657 skb_dst_set(skb, dst);
2658 return res;
1da177e4
LT		 2659}
2660EXPORT_SYMBOL(__xfrm_route_forward);
2661
d49c73c7
DM		 2662/* Optimize later using cookies and generation ids. */
2663
1da177e4
LT		 2664static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2665{
d49c73c7 2666 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2667 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2668 * get validated by dst_ops->check on every use. We do this
2669 * because when a normal route referenced by an XFRM dst is
2670 * obsoleted we do not go looking around for all parent
2671 * referencing XFRM dsts so that we can invalidate them. It
2672 * is just too much work. Instead we make the checks here on
2673 * every use. For example:
d49c73c7
DM		 2674 *
2675 * XFRM dst A --> IPv4 dst X
2676 *
2677 * X is the "xdst->route" of A (X is also the "dst->path" of A
2678 * in this example). If X is marked obsolete, "A" will not
2679 * notice. That's what we are validating here via the
2680 * stale_bundle() check.
2681 *
2682 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2683 * dst which causes it's ->obsolete field to be set to
2684 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2685 * this, we want to force a new route lookup.
399c180a 2686 */
d49c73c7
DM		 2687 if (dst->obsolete < 0 && !stale_bundle(dst))
2688 return dst;
2689
1da177e4
LT		 2690 return NULL;
2691}
2692
2693static int stale_bundle(struct dst_entry *dst)
2694{
12fdb4d3 2695 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2696}
2697
aabc9761 2698void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2699{
1da177e4 2700 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2701 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2702 dev_hold(dst->dev);
1da177e4
LT		 2703 dev_put(dev);
2704 }
2705}
aabc9761 2706EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2707
2708static void xfrm_link_failure(struct sk_buff *skb)
2709{
2710 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2711}
2712
2713static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2714{
2715 if (dst) {
2716 if (dst->obsolete) {
2717 dst_release(dst);
2718 dst = NULL;
2719 }
2720 }
2721 return dst;
2722}
2723
e4c17216 2724void xfrm_garbage_collect(struct net *net)
c0ed1c14 2725{
ca925cf1 2726 flow_cache_flush(net);
c0ed1c14 2727}
e4c17216 2728EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14 2729
3d7d25a6 2730void xfrm_garbage_collect_deferred(struct net *net)
c0ed1c14 2731{
ca925cf1 2732 flow_cache_flush_deferred(net);
c0ed1c14 2733}
3d7d25a6 2734EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
c0ed1c14 2735
25ee3286 2736static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2737{
2738 do {
2739 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2740 u32 pmtu, route_mtu_cached;
2741
2742 pmtu = dst_mtu(dst->child);
2743 xdst->child_mtu_cached = pmtu;
2744
2745 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2746
2747 route_mtu_cached = dst_mtu(xdst->route);
2748 xdst->route_mtu_cached = route_mtu_cached;
2749
2750 if (pmtu > route_mtu_cached)
2751 pmtu = route_mtu_cached;
2752
defb3519 2753 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2754 } while ((dst = dst->next));
2755}
2756
1da177e4
LT		 2757/* Check that the bundle accepts the flow and its components are
2758 * still valid.
2759 */
2760
12fdb4d3 2761static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2762{
2763 struct dst_entry *dst = &first->u.dst;
2764 struct xfrm_dst *last;
2765 u32 mtu;
2766
92d63dec 2767 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2768 (dst->dev && !netif_running(dst->dev)))
2769 return 0;
2770
a0073fe1
SK		 2771 if (dst->flags & DST_XFRM_QUEUE)
2772 return 1;
2773
1da177e4
LT		 2774 last = NULL;
2775
2776 do {
2777 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2778
1da177e4
LT		 2779 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2780 return 0;
80c802f3
TT		 2781 if (xdst->xfrm_genid != dst->xfrm->genid)
2782 return 0;
b1312c89
TT		 2783 if (xdst->num_pols > 0 &&
2784 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2785 return 0;
e53820de 2786
1da177e4
LT		 2787 mtu = dst_mtu(dst->child);
2788 if (xdst->child_mtu_cached != mtu) {
2789 last = xdst;
2790 xdst->child_mtu_cached = mtu;
2791 }
2792
92d63dec 2793 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2794 return 0;
2795 mtu = dst_mtu(xdst->route);
2796 if (xdst->route_mtu_cached != mtu) {
2797 last = xdst;
2798 xdst->route_mtu_cached = mtu;
2799 }
2800
2801 dst = dst->child;
2802 } while (dst->xfrm);
2803
2804 if (likely(!last))
2805 return 1;
2806
2807 mtu = last->child_mtu_cached;
2808 for (;;) {
2809 dst = &last->u.dst;
2810
2811 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2812 if (mtu > last->route_mtu_cached)
2813 mtu = last->route_mtu_cached;
defb3519 2814 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2815
2816 if (last == first)
2817 break;
2818
bd0bf076 2819 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2820 last->child_mtu_cached = mtu;
2821 }
2822
2823 return 1;
2824}
2825
0dbaee3b
DM		 2826static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2827{
2828 return dst_metric_advmss(dst->path);
2829}
2830
ebb762f2 2831static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2832{
618f9bc7
SK		 2833 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2834
2835 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2836}
2837
1ecc9ad0
JA		 2838static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2839 const void *daddr)
63fca65d
JA		 2840{
2841 const struct dst_entry *path = dst->path;
2842
2843 for (; dst != path; dst = dst->child) {
2844 const struct xfrm_state *xfrm = dst->xfrm;
2845
2846 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2847 continue;
2848 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2849 daddr = xfrm->coaddr;
2850 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2851 daddr = &xfrm->id.daddr;
2852 }
1ecc9ad0
JA		 2853 return daddr;
2854}
2855
2856static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2857 struct sk_buff *skb,
2858 const void *daddr)
2859{
2860 const struct dst_entry *path = dst->path;
2861
2862 if (!skb)
2863 daddr = xfrm_get_dst_nexthop(dst, daddr);
2864 return path->ops->neigh_lookup(path, skb, daddr);
2865}
2866
2867static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2868{
2869 const struct dst_entry *path = dst->path;
2870
2871 daddr = xfrm_get_dst_nexthop(dst, daddr);
63fca65d
JA		 2872 path->ops->confirm_neigh(path, daddr);
2873}
2874
a2817d8b 2875int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
1da177e4
LT		 2876{
2877 int err = 0;
a2817d8b
FW		 2878
2879 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
1da177e4 2880 return -EAFNOSUPPORT;
a2817d8b 2881
ef8531b6 2882 spin_lock(&xfrm_policy_afinfo_lock);
a2817d8b 2883 if (unlikely(xfrm_policy_afinfo[family] != NULL))
f31e8d4f 2884 err = -EEXIST;
1da177e4
LT		 2885 else {
2886 struct dst_ops *dst_ops = afinfo->dst_ops;
2887 if (likely(dst_ops->kmem_cachep == NULL))
2888 dst_ops->kmem_cachep = xfrm_dst_cache;
2889 if (likely(dst_ops->check == NULL))
2890 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2891 if (likely(dst_ops->default_advmss == NULL))
2892 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2893 if (likely(dst_ops->mtu == NULL))
2894 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2895 if (likely(dst_ops->negative_advice == NULL))
2896 dst_ops->negative_advice = xfrm_negative_advice;
2897 if (likely(dst_ops->link_failure == NULL))
2898 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2899 if (likely(dst_ops->neigh_lookup == NULL))
2900 dst_ops->neigh_lookup = xfrm_neigh_lookup;
63fca65d
JA		 2901 if (likely(!dst_ops->confirm_neigh))
2902 dst_ops->confirm_neigh = xfrm_confirm_neigh;
a2817d8b 2903 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
1da177e4 2904 }
ef8531b6 2905 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 2906
1da177e4
LT		 2907 return err;
2908}
2909EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2910
a2817d8b 2911void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
1da177e4 2912{
2b61997a 2913 struct dst_ops *dst_ops = afinfo->dst_ops;
a2817d8b 2914 int i;
2b61997a 2915
a2817d8b
FW		 2916 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2917 if (xfrm_policy_afinfo[i] != afinfo)
2918 continue;
2919 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2920 break;
ef8531b6 2921 }
ef8531b6 2922
2b61997a 2923 synchronize_rcu();
ef8531b6 2924
2b61997a
FW		 2925 dst_ops->kmem_cachep = NULL;
2926 dst_ops->check = NULL;
2927 dst_ops->negative_advice = NULL;
2928 dst_ops->link_failure = NULL;
1da177e4
LT		 2929}
2930EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2931
1da177e4
LT		 2932static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2933{
351638e7 2934 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
e9dc8653 2935
1da177e4
LT		 2936 switch (event) {
2937 case NETDEV_DOWN:
c0ed1c14 2938 xfrm_garbage_collect(dev_net(dev));
1da177e4
LT		 2939 }
2940 return NOTIFY_DONE;
2941}
2942
2943static struct notifier_block xfrm_dev_notifier = {
d5917a35 2944 .notifier_call = xfrm_dev_event,
1da177e4
LT		 2945};
2946
558f82ef 2947#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2948static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2949{
c68cd1a0 2950 int rv;
698365fa
WC		 2951 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2952 if (!net->mib.xfrm_statistics)
558f82ef 2953 return -ENOMEM;
c68cd1a0
AD		 2954 rv = xfrm_proc_init(net);
2955 if (rv < 0)
698365fa 2956 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 2957 return rv;
558f82ef 2958}
59c9940e
AD		 2959
2960static void xfrm_statistics_fini(struct net *net)
2961{
c68cd1a0 2962 xfrm_proc_fini(net);
698365fa 2963 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 2964}
2965#else
2966static int __net_init xfrm_statistics_init(struct net *net)
2967{
2968 return 0;
2969}
2970
2971static void xfrm_statistics_fini(struct net *net)
2972{
2973}
558f82ef
MN		 2974#endif
2975
d62ddc21 2976static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2977{
2518c7c2
DM		 2978 unsigned int hmask, sz;
2979 int dir;
2980
d62ddc21
AD		 2981 if (net_eq(net, &init_net))
2982 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2983 sizeof(struct xfrm_dst),
e5d679f3 2984 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2985 NULL);
1da177e4 2986
2518c7c2
DM		 2987 hmask = 8 - 1;
2988 sz = (hmask+1) * sizeof(struct hlist_head);
2989
93b851c1
AD		 2990 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2991 if (!net->xfrm.policy_byidx)
2992 goto out_byidx;
8100bea7 2993 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 2994
53c2e285 2995 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 2996 struct xfrm_policy_hash *htab;
2997
dc2caba7 2998 net->xfrm.policy_count[dir] = 0;
53c2e285 2999 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 3000 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 3001
a35f6c5d 3002 htab = &net->xfrm.policy_bydst[dir];
44e36b42 3003 htab->table = xfrm_hash_alloc(sz);
2518c7c2 3004 if (!htab->table)
a35f6c5d
AD		 3005 goto out_bydst;
3006 htab->hmask = hmask;
b58555f1
CG		 3007 htab->dbits4 = 32;
3008 htab->sbits4 = 32;
3009 htab->dbits6 = 128;
3010 htab->sbits6 = 128;
2518c7c2 3011 }
880a6fab
CG		 3012 net->xfrm.policy_hthresh.lbits4 = 32;
3013 net->xfrm.policy_hthresh.rbits4 = 32;
3014 net->xfrm.policy_hthresh.lbits6 = 128;
3015 net->xfrm.policy_hthresh.rbits6 = 128;
3016
3017 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 3018
adfcf0b2 3019 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 3020 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 3021 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21
AD		 3022 if (net_eq(net, &init_net))
3023 register_netdevice_notifier(&xfrm_dev_notifier);
3024 return 0;
93b851c1 3025
a35f6c5d
AD		 3026out_bydst:
3027 for (dir--; dir >= 0; dir--) {
3028 struct xfrm_policy_hash *htab;
3029
3030 htab = &net->xfrm.policy_bydst[dir];
3031 xfrm_hash_free(htab->table, sz);
3032 }
3033 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 3034out_byidx:
3035 return -ENOMEM;
d62ddc21
AD		 3036}
3037
3038static void xfrm_policy_fini(struct net *net)
3039{
93b851c1 3040 unsigned int sz;
8b18f8ea 3041 int dir;
93b851c1 3042
7c2776ee
AD		 3043 flush_work(&net->xfrm.policy_hash_work);
3044#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 3045 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 3046#endif
2e71029e 3047 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 3048
adfcf0b2 3049 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 3050
53c2e285 3051 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 3052 struct xfrm_policy_hash *htab;
3053
8b18f8ea 3054 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 3055
3056 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 3057 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 3058 WARN_ON(!hlist_empty(htab->table));
3059 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 3060 }
3061
8100bea7 3062 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 3063 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3064 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 3065}
3066
d62ddc21
AD		 3067static int __net_init xfrm_net_init(struct net *net)
3068{
3069 int rv;
3070
c282222a
FW		 3071 /* Initialize the per-net locks here */
3072 spin_lock_init(&net->xfrm.xfrm_state_lock);
3073 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3074 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3075
59c9940e
AD		 3076 rv = xfrm_statistics_init(net);
3077 if (rv < 0)
3078 goto out_statistics;
d62ddc21
AD		 3079 rv = xfrm_state_init(net);
3080 if (rv < 0)
3081 goto out_state;
3082 rv = xfrm_policy_init(net);
3083 if (rv < 0)
3084 goto out_policy;
b27aeadb
AD		 3085 rv = xfrm_sysctl_init(net);
3086 if (rv < 0)
3087 goto out_sysctl;
4a93f509
SK		 3088 rv = flow_cache_init(net);
3089 if (rv < 0)
3090 goto out;
283bc9f3 3091
d62ddc21
AD		 3092 return 0;
3093
4a93f509
SK		 3094out:
3095 xfrm_sysctl_fini(net);
b27aeadb
AD		 3096out_sysctl:
3097 xfrm_policy_fini(net);
d62ddc21
AD		 3098out_policy:
3099 xfrm_state_fini(net);
3100out_state:
59c9940e
AD		 3101 xfrm_statistics_fini(net);
3102out_statistics:
d62ddc21
AD		 3103 return rv;
3104}
3105
3106static void __net_exit xfrm_net_exit(struct net *net)
3107{
4a93f509 3108 flow_cache_fini(net);
b27aeadb 3109 xfrm_sysctl_fini(net);
d62ddc21
AD		 3110 xfrm_policy_fini(net);
3111 xfrm_state_fini(net);
59c9940e 3112 xfrm_statistics_fini(net);
d62ddc21
AD		 3113}
3114
3115static struct pernet_operations __net_initdata xfrm_net_ops = {
3116 .init = xfrm_net_init,
3117 .exit = xfrm_net_exit,
3118};
3119
1da177e4
LT		 3120void __init xfrm_init(void)
3121{
a4fc1bfc 3122 flow_cache_hp_init();
d62ddc21 3123 register_pernet_subsys(&xfrm_net_ops);
30846090 3124 seqcount_init(&xfrm_policy_hash_generation);
1da177e4
LT		 3125 xfrm_input_init();
3126}
3127
ab5f5e8b 3128#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 3129static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3130 struct audit_buffer *audit_buf)
ab5f5e8b 3131{
875179fa
PM		 3132 struct xfrm_sec_ctx *ctx = xp->security;
3133 struct xfrm_selector *sel = &xp->selector;
3134
3135 if (ctx)
ab5f5e8b 3136 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 3137 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 3138
9b7a787d 3139 switch (sel->family) {
ab5f5e8b 3140 case AF_INET:
21454aaa 3141 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 3142 if (sel->prefixlen_s != 32)
3143 audit_log_format(audit_buf, " src_prefixlen=%d",
3144 sel->prefixlen_s);
21454aaa 3145 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 3146 if (sel->prefixlen_d != 32)
3147 audit_log_format(audit_buf, " dst_prefixlen=%d",
3148 sel->prefixlen_d);
ab5f5e8b
JL		 3149 break;
3150 case AF_INET6:
5b095d98 3151 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3152 if (sel->prefixlen_s != 128)
3153 audit_log_format(audit_buf, " src_prefixlen=%d",
3154 sel->prefixlen_s);
5b095d98 3155 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3156 if (sel->prefixlen_d != 128)
3157 audit_log_format(audit_buf, " dst_prefixlen=%d",
3158 sel->prefixlen_d);
ab5f5e8b
JL		 3159 break;
3160 }
3161}
3162
2e71029e 3163void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 3164{
3165 struct audit_buffer *audit_buf;
ab5f5e8b 3166
afeb14b4 3167 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3168 if (audit_buf == NULL)
3169 return;
2e71029e 3170 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3171 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3172 xfrm_audit_common_policyinfo(xp, audit_buf);
3173 audit_log_end(audit_buf);
3174}
3175EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3176
68277acc 3177void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 3178 bool task_valid)
ab5f5e8b
JL		 3179{
3180 struct audit_buffer *audit_buf;
ab5f5e8b 3181
afeb14b4 3182 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3183 if (audit_buf == NULL)
3184 return;
2e71029e 3185 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3186 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3187 xfrm_audit_common_policyinfo(xp, audit_buf);
3188 audit_log_end(audit_buf);
3189}
3190EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3191#endif
3192
80c9abaa 3193#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3194static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3195 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3196{
3197 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3198 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3199 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3200 sel_cmp->family) &&
3201 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3202 sel_cmp->family) &&
80c9abaa
SS		 3203 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3204 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3205 return true;
80c9abaa
SS		 3206 }
3207 } else {
3208 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3209 return true;
80c9abaa
SS		 3210 }
3211 }
bc9b35ad 3212 return false;
80c9abaa
SS		 3213}
3214
3e94c2dc
WC		 3215static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3216 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3217{
3218 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3219 struct hlist_head *chain;
3220 u32 priority = ~0U;
3221
9d0380df 3222 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 3223 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3224 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3225 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3226 pol->type == type) {
3227 ret = pol;
3228 priority = ret->priority;
3229 break;
3230 }
3231 }
8d549c4f 3232 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3233 hlist_for_each_entry(pol, chain, bydst) {
8faf491e
LR		 3234 if ((pol->priority >= priority) && ret)
3235 break;
3236
80c9abaa 3237 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 3238 pol->type == type) {
80c9abaa
SS		 3239 ret = pol;
3240 break;
3241 }
3242 }
3243
586f2eb4 3244 xfrm_pol_hold(ret);
80c9abaa 3245
9d0380df 3246 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3247
3248 return ret;
3249}
3250
dd701754 3251static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3252{
3253 int match = 0;
3254
3255 if (t->mode == m->mode && t->id.proto == m->proto &&
3256 (m->reqid == 0 || t->reqid == m->reqid)) {
3257 switch (t->mode) {
3258 case XFRM_MODE_TUNNEL:
3259 case XFRM_MODE_BEET:
70e94e66
YH		 3260 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3261 m->old_family) &&
3262 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3263 m->old_family)) {
80c9abaa
SS		 3264 match = 1;
3265 }
3266 break;
3267 case XFRM_MODE_TRANSPORT:
3268 /* in case of transport mode, template does not store
3269 any IP addresses, hence we just compare mode and
3270 protocol */
3271 match = 1;
3272 break;
3273 default:
3274 break;
3275 }
3276 }
3277 return match;
3278}
3279
3280/* update endpoint address(es) of template(s) */
3281static int xfrm_policy_migrate(struct xfrm_policy *pol,
3282 struct xfrm_migrate *m, int num_migrate)
3283{
3284 struct xfrm_migrate *mp;
80c9abaa
SS		 3285 int i, j, n = 0;
3286
3287 write_lock_bh(&pol->lock);
12a169e7 3288 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3289 /* target policy has been deleted */
3290 write_unlock_bh(&pol->lock);
3291 return -ENOENT;
3292 }
3293
3294 for (i = 0; i < pol->xfrm_nr; i++) {
3295 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3296 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3297 continue;
3298 n++;
1bfcb10f
HX		 3299 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3300 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3301 continue;
3302 /* update endpoints */
3303 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3304 sizeof(pol->xfrm_vec[i].id.daddr));
3305 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3306 sizeof(pol->xfrm_vec[i].saddr));
3307 pol->xfrm_vec[i].encap_family = mp->new_family;
3308 /* flush bundles */
80c802f3 3309 atomic_inc(&pol->genid);
80c9abaa
SS		 3310 }
3311 }
3312
3313 write_unlock_bh(&pol->lock);
3314
3315 if (!n)
3316 return -ENODATA;
3317
3318 return 0;
3319}
3320
dd701754 3321static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3322{
3323 int i, j;
3324
3325 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3326 return -EINVAL;
3327
3328 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3329 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3330 m[i].old_family) &&
3331 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3332 m[i].old_family))
80c9abaa
SS		 3333 return -EINVAL;
3334 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3335 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3336 return -EINVAL;
3337
3338 /* check if there is any duplicated entry */
3339 for (j = i + 1; j < num_migrate; j++) {
3340 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3341 sizeof(m[i].old_daddr)) &&
3342 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3343 sizeof(m[i].old_saddr)) &&
3344 m[i].proto == m[j].proto &&
3345 m[i].mode == m[j].mode &&
3346 m[i].reqid == m[j].reqid &&
3347 m[i].old_family == m[j].old_family)
3348 return -EINVAL;
3349 }
3350 }
3351
3352 return 0;
3353}
3354
b4b7c0b3 3355int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3356 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3357 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3358{
3359 int i, err, nx_cur = 0, nx_new = 0;
3360 struct xfrm_policy *pol = NULL;
3361 struct xfrm_state *x, *xc;
3362 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3363 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3364 struct xfrm_migrate *mp;
3365
3366 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3367 goto out;
3368
3369 /* Stage 1 - find policy */
8d549c4f 3370 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3371 err = -ENOENT;
3372 goto out;
3373 }
3374
3375 /* Stage 2 - find and update state(s) */
3376 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3377 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3378 x_cur[nx_cur] = x;
3379 nx_cur++;
3380 if ((xc = xfrm_state_migrate(x, mp))) {
3381 x_new[nx_new] = xc;
3382 nx_new++;
3383 } else {
3384 err = -ENODATA;
3385 goto restore_state;
3386 }
3387 }
3388 }
3389
3390 /* Stage 3 - update policy */
3391 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3392 goto restore_state;
3393
3394 /* Stage 4 - delete old state(s) */
3395 if (nx_cur) {
3396 xfrm_states_put(x_cur, nx_cur);
3397 xfrm_states_delete(x_cur, nx_cur);
3398 }
3399
3400 /* Stage 5 - announce */
13c1d189 3401 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3402
3403 xfrm_pol_put(pol);
3404
3405 return 0;
3406out:
3407 return err;
3408
3409restore_state:
3410 if (pol)
3411 xfrm_pol_put(pol);
3412 if (nx_cur)
3413 xfrm_states_put(x_cur, nx_cur);
3414 if (nx_new)
3415 xfrm_states_delete(x_new, nx_new);
3416
3417 return err;
3418}
e610e679 3419EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3420#endif
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