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Merge tag 'docs-4.15-2' of git://git.lwn.net/linux
[linux.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 <[email protected]>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <[email protected]> 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>
ec30d78c 27#include <linux/cpu.h>
68277acc 28#include <linux/audit.h>
25ee3286 29#include <net/dst.h>
6ce74ec7 30#include <net/flow.h>
1da177e4
LT		 31#include <net/xfrm.h>
32#include <net/ip.h>
558f82ef
MN		 33#ifdef CONFIG_XFRM_STATISTICS
34#include <net/snmp.h>
35#endif
1da177e4 36
44e36b42
DM		 37#include "xfrm_hash.h"
38
a0073fe1
SK		 39#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
40#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
41#define XFRM_MAX_QUEUE_LEN 100
42
b8c203b2
SK		 43struct xfrm_flo {
44 struct dst_entry *dst_orig;
45 u8 flags;
46};
47
ec30d78c
FW		 48static DEFINE_PER_CPU(struct xfrm_dst *, xfrm_last_dst);
49static struct work_struct *xfrm_pcpu_work __read_mostly;
418a99ac 50static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
37b10383 51static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
418a99ac 52 __read_mostly;
1da177e4 53
e18b890b 54static struct kmem_cache *xfrm_dst_cache __read_mostly;
30846090 55static __read_mostly seqcount_t xfrm_policy_hash_generation;
1da177e4 56
25ee3286 57static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 58static int stale_bundle(struct dst_entry *dst);
12fdb4d3 59static int xfrm_bundle_ok(struct xfrm_dst *xdst);
c3aed709 60static void xfrm_policy_queue_process(struct timer_list *t);
1da177e4 61
12bfa8bd 62static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
29fa0b30
WY		 63static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
64 int dir);
65
e37cc8ad
FW		 66static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
67{
850a6212 68 return refcount_inc_not_zero(&policy->refcnt);
e37cc8ad
FW		 69}
70
bc9b35ad 71static inline bool
200ce96e 72__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 73{
7e1dc7b6
DM		 74 const struct flowi4 *fl4 = &fl->u.ip4;
75
26bff940
AD		 76 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
77 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 78 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
79 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
80 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
81 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 82}
83
bc9b35ad 84static inline bool
200ce96e 85__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 86{
7e1dc7b6
DM		 87 const struct flowi6 *fl6 = &fl->u.ip6;
88
89 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
90 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
91 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
92 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
93 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
94 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 95}
96
bc9b35ad
DM		 97bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
98 unsigned short family)
77681021
AM		 99{
100 switch (family) {
101 case AF_INET:
102 return __xfrm4_selector_match(sel, fl);
103 case AF_INET6:
104 return __xfrm6_selector_match(sel, fl);
105 }
bc9b35ad 106 return false;
77681021
AM		 107}
108
a2817d8b 109static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
ef8531b6 110{
a2817d8b 111 const struct xfrm_policy_afinfo *afinfo;
ef8531b6 112
a2817d8b 113 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
ef8531b6
ED		 114 return NULL;
115 rcu_read_lock();
116 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
117 if (unlikely(!afinfo))
118 rcu_read_unlock();
119 return afinfo;
120}
121
d77e38e6
SK		 122struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
123 const xfrm_address_t *saddr,
124 const xfrm_address_t *daddr,
077fbac4 125 int family, u32 mark)
9bb182a7 126{
37b10383 127 const struct xfrm_policy_afinfo *afinfo;
9bb182a7
YH		 128 struct dst_entry *dst;
129
130 afinfo = xfrm_policy_get_afinfo(family);
131 if (unlikely(afinfo == NULL))
132 return ERR_PTR(-EAFNOSUPPORT);
133
077fbac4 134 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark);
9bb182a7 135
bdba9fe0 136 rcu_read_unlock();
9bb182a7
YH		 137
138 return dst;
139}
d77e38e6 140EXPORT_SYMBOL(__xfrm_dst_lookup);
9bb182a7 141
42a7b32b
DA		 142static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
143 int tos, int oif,
9bb182a7
YH		 144 xfrm_address_t *prev_saddr,
145 xfrm_address_t *prev_daddr,
077fbac4 146 int family, u32 mark)
1da177e4 147{
c5b3cf46 148 struct net *net = xs_net(x);
66cdb3ca
HX		 149 xfrm_address_t *saddr = &x->props.saddr;
150 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 151 struct dst_entry *dst;
152
9bb182a7 153 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 154 saddr = x->coaddr;
9bb182a7
YH		 155 daddr = prev_daddr;
156 }
157 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
158 saddr = prev_saddr;
66cdb3ca 159 daddr = x->coaddr;
9bb182a7 160 }
1da177e4 161
077fbac4 162 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark);
9bb182a7
YH		 163
164 if (!IS_ERR(dst)) {
165 if (prev_saddr != saddr)
166 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
167 if (prev_daddr != daddr)
168 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
169 }
1da177e4 170
66cdb3ca 171 return dst;
1da177e4 172}
1da177e4 173
1da177e4
LT		 174static inline unsigned long make_jiffies(long secs)
175{
176 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
177 return MAX_SCHEDULE_TIMEOUT-1;
178 else
a716c119 179 return secs*HZ;
1da177e4
LT		 180}
181
c3aed709 182static void xfrm_policy_timer(struct timer_list *t)
1da177e4 183{
c3aed709 184 struct xfrm_policy *xp = from_timer(xp, t, timer);
9d729f72 185 unsigned long now = get_seconds();
1da177e4
LT		 186 long next = LONG_MAX;
187 int warn = 0;
188 int dir;
189
190 read_lock(&xp->lock);
191
ea2dea9d 192 if (unlikely(xp->walk.dead))
1da177e4
LT		 193 goto out;
194
77d8d7a6 195 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 196
197 if (xp->lft.hard_add_expires_seconds) {
198 long tmo = xp->lft.hard_add_expires_seconds +
199 xp->curlft.add_time - now;
200 if (tmo <= 0)
201 goto expired;
202 if (tmo < next)
203 next = tmo;
204 }
205 if (xp->lft.hard_use_expires_seconds) {
206 long tmo = xp->lft.hard_use_expires_seconds +
207 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
208 if (tmo <= 0)
209 goto expired;
210 if (tmo < next)
211 next = tmo;
212 }
213 if (xp->lft.soft_add_expires_seconds) {
214 long tmo = xp->lft.soft_add_expires_seconds +
215 xp->curlft.add_time - now;
216 if (tmo <= 0) {
217 warn = 1;
218 tmo = XFRM_KM_TIMEOUT;
219 }
220 if (tmo < next)
221 next = tmo;
222 }
223 if (xp->lft.soft_use_expires_seconds) {
224 long tmo = xp->lft.soft_use_expires_seconds +
225 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
226 if (tmo <= 0) {
227 warn = 1;
228 tmo = XFRM_KM_TIMEOUT;
229 }
230 if (tmo < next)
231 next = tmo;
232 }
233
234 if (warn)
6c5c8ca7 235 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT		 236 if (next != LONG_MAX &&
237 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
238 xfrm_pol_hold(xp);
239
240out:
241 read_unlock(&xp->lock);
242 xfrm_pol_put(xp);
243 return;
244
245expired:
246 read_unlock(&xp->lock);
4666faab 247 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 248 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 249 xfrm_pol_put(xp);
250}
251
1da177e4
LT		 252/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
253 * SPD calls.
254 */
255
0331b1f3 256struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 257{
258 struct xfrm_policy *policy;
259
0da974f4 260 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 261
262 if (policy) {
0331b1f3 263 write_pnet(&policy->xp_net, net);
12a169e7 264 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM		 265 INIT_HLIST_NODE(&policy->bydst);
266 INIT_HLIST_NODE(&policy->byidx);
1da177e4 267 rwlock_init(&policy->lock);
850a6212 268 refcount_set(&policy->refcnt, 1);
a0073fe1 269 skb_queue_head_init(&policy->polq.hold_queue);
c3aed709
KC		 270 timer_setup(&policy->timer, xfrm_policy_timer, 0);
271 timer_setup(&policy->polq.hold_timer,
272 xfrm_policy_queue_process, 0);
1da177e4
LT		 273 }
274 return policy;
275}
276EXPORT_SYMBOL(xfrm_policy_alloc);
277
56f04730
ED		 278static void xfrm_policy_destroy_rcu(struct rcu_head *head)
279{
280 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
281
282 security_xfrm_policy_free(policy->security);
283 kfree(policy);
284}
285
1da177e4
LT		 286/* Destroy xfrm_policy: descendant resources must be released to this moment. */
287
64c31b3f 288void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 289{
12a169e7 290 BUG_ON(!policy->walk.dead);
1da177e4 291
0659eea9 292 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 293 BUG();
294
56f04730 295 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
1da177e4 296}
64c31b3f 297EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 298
1365e547 299/* Rule must be locked. Release descendant resources, announce
1da177e4
LT		 300 * entry dead. The rule must be unlinked from lists to the moment.
301 */
302
303static void xfrm_policy_kill(struct xfrm_policy *policy)
304{
12a169e7 305 policy->walk.dead = 1;
1da177e4 306
285ead17 307 atomic_inc(&policy->genid);
1da177e4 308
e7d8f6cb
SK		 309 if (del_timer(&policy->polq.hold_timer))
310 xfrm_pol_put(policy);
1ee5e667 311 skb_queue_purge(&policy->polq.hold_queue);
a0073fe1 312
285ead17
TT		 313 if (del_timer(&policy->timer))
314 xfrm_pol_put(policy);
315
316 xfrm_pol_put(policy);
1da177e4
LT		 317}
318
2518c7c2
DM		 319static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
320
e92303f8 321static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 322{
e92303f8 323 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 324}
325
b58555f1
CG		 326/* calculate policy hash thresholds */
327static void __get_hash_thresh(struct net *net,
328 unsigned short family, int dir,
329 u8 *dbits, u8 *sbits)
330{
331 switch (family) {
332 case AF_INET:
333 *dbits = net->xfrm.policy_bydst[dir].dbits4;
334 *sbits = net->xfrm.policy_bydst[dir].sbits4;
335 break;
336
337 case AF_INET6:
338 *dbits = net->xfrm.policy_bydst[dir].dbits6;
339 *sbits = net->xfrm.policy_bydst[dir].sbits6;
340 break;
341
342 default:
343 *dbits = 0;
344 *sbits = 0;
345 }
346}
347
5f803b58
DM		 348static struct hlist_head *policy_hash_bysel(struct net *net,
349 const struct xfrm_selector *sel,
350 unsigned short family, int dir)
2518c7c2 351{
1121994c 352 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 353 unsigned int hash;
354 u8 dbits;
355 u8 sbits;
356
357 __get_hash_thresh(net, family, dir, &dbits, &sbits);
358 hash = __sel_hash(sel, family, hmask, dbits, sbits);
2518c7c2 359
e1e551bc
FW		 360 if (hash == hmask + 1)
361 return &net->xfrm.policy_inexact[dir];
362
363 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
364 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 365}
366
5f803b58
DM		 367static struct hlist_head *policy_hash_direct(struct net *net,
368 const xfrm_address_t *daddr,
369 const xfrm_address_t *saddr,
370 unsigned short family, int dir)
2518c7c2 371{
1121994c 372 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 373 unsigned int hash;
374 u8 dbits;
375 u8 sbits;
376
377 __get_hash_thresh(net, family, dir, &dbits, &sbits);
378 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
2518c7c2 379
e1e551bc
FW		 380 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
381 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 382}
383
b58555f1
CG		 384static void xfrm_dst_hash_transfer(struct net *net,
385 struct hlist_head *list,
2518c7c2 386 struct hlist_head *ndsttable,
b58555f1
CG		 387 unsigned int nhashmask,
388 int dir)
2518c7c2 389{
b67bfe0d 390 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 391 struct xfrm_policy *pol;
b791160b 392 unsigned int h0 = 0;
b58555f1
CG		 393 u8 dbits;
394 u8 sbits;
2518c7c2 395
b791160b 396redo:
b67bfe0d 397 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 398 unsigned int h;
399
b58555f1 400 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
2518c7c2 401 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
b58555f1 402 pol->family, nhashmask, dbits, sbits);
b791160b 403 if (!entry0) {
a5eefc1d
FW		 404 hlist_del_rcu(&pol->bydst);
405 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
b791160b
YH		 406 h0 = h;
407 } else {
408 if (h != h0)
409 continue;
a5eefc1d
FW		 410 hlist_del_rcu(&pol->bydst);
411 hlist_add_behind_rcu(&pol->bydst, entry0);
b791160b 412 }
b67bfe0d 413 entry0 = &pol->bydst;
b791160b
YH		 414 }
415 if (!hlist_empty(list)) {
416 entry0 = NULL;
417 goto redo;
2518c7c2
DM		 418 }
419}
420
421static void xfrm_idx_hash_transfer(struct hlist_head *list,
422 struct hlist_head *nidxtable,
423 unsigned int nhashmask)
424{
b67bfe0d 425 struct hlist_node *tmp;
2518c7c2
DM		 426 struct xfrm_policy *pol;
427
b67bfe0d 428 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 429 unsigned int h;
430
431 h = __idx_hash(pol->index, nhashmask);
432 hlist_add_head(&pol->byidx, nidxtable+h);
433 }
434}
435
436static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
437{
438 return ((old_hmask + 1) << 1) - 1;
439}
440
66caf628 441static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 442{
66caf628 443 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 444 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
445 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
44e36b42 446 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
e1e551bc 447 struct hlist_head *odst;
2518c7c2
DM		 448 int i;
449
450 if (!ndst)
451 return;
452
9d0380df 453 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
30846090
FW		 454 write_seqcount_begin(&xfrm_policy_hash_generation);
455
456 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
457 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
2518c7c2 458
e1e551bc
FW		 459 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
460 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
461
2518c7c2 462 for (i = hmask; i >= 0; i--)
b58555f1 463 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
2518c7c2 464
e1e551bc 465 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
66caf628 466 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 467
30846090 468 write_seqcount_end(&xfrm_policy_hash_generation);
9d0380df 469 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 470
e1e551bc
FW		 471 synchronize_rcu();
472
44e36b42 473 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 474}
475
66caf628 476static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 477{
66caf628 478 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 479 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
480 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 481 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 482 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 483 int i;
484
485 if (!nidx)
486 return;
487
9d0380df 488 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 489
490 for (i = hmask; i >= 0; i--)
491 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
492
66caf628
AD		 493 net->xfrm.policy_byidx = nidx;
494 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 495
9d0380df 496 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 497
44e36b42 498 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 499}
500
66caf628 501static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 502{
66caf628
AD		 503 unsigned int cnt = net->xfrm.policy_count[dir];
504 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 505
506 if (total)
507 *total += cnt;
508
509 if ((hmask + 1) < xfrm_policy_hashmax &&
510 cnt > hmask)
511 return 1;
512
513 return 0;
514}
515
66caf628 516static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 517{
66caf628 518 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 519
520 if ((hmask + 1) < xfrm_policy_hashmax &&
521 total > hmask)
522 return 1;
523
524 return 0;
525}
526
e071041b 527void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 528{
e071041b
AD		 529 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
530 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
531 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
532 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
533 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
534 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
535 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 536 si->spdhmcnt = xfrm_policy_hashmax;
ecfd6b18
JHS		 537}
538EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 539
ecfd6b18 540static DEFINE_MUTEX(hash_resize_mutex);
66caf628 541static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 542{
66caf628 543 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 544 int dir, total;
545
546 mutex_lock(&hash_resize_mutex);
547
548 total = 0;
53c2e285 549 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
66caf628
AD		 550 if (xfrm_bydst_should_resize(net, dir, &total))
551 xfrm_bydst_resize(net, dir);
2518c7c2 552 }
66caf628
AD		 553 if (xfrm_byidx_should_resize(net, total))
554 xfrm_byidx_resize(net, total);
2518c7c2
DM		 555
556 mutex_unlock(&hash_resize_mutex);
557}
558
880a6fab
CG		 559static void xfrm_hash_rebuild(struct work_struct *work)
560{
561 struct net *net = container_of(work, struct net,
562 xfrm.policy_hthresh.work);
563 unsigned int hmask;
564 struct xfrm_policy *pol;
565 struct xfrm_policy *policy;
566 struct hlist_head *chain;
567 struct hlist_head *odst;
568 struct hlist_node *newpos;
569 int i;
570 int dir;
571 unsigned seq;
572 u8 lbits4, rbits4, lbits6, rbits6;
573
574 mutex_lock(&hash_resize_mutex);
575
576 /* read selector prefixlen thresholds */
577 do {
578 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
579
580 lbits4 = net->xfrm.policy_hthresh.lbits4;
581 rbits4 = net->xfrm.policy_hthresh.rbits4;
582 lbits6 = net->xfrm.policy_hthresh.lbits6;
583 rbits6 = net->xfrm.policy_hthresh.rbits6;
584 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
585
9d0380df 586 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 587
588 /* reset the bydst and inexact table in all directions */
53c2e285 589 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
880a6fab
CG		 590 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
591 hmask = net->xfrm.policy_bydst[dir].hmask;
592 odst = net->xfrm.policy_bydst[dir].table;
593 for (i = hmask; i >= 0; i--)
594 INIT_HLIST_HEAD(odst + i);
595 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
596 /* dir out => dst = remote, src = local */
597 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
598 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
599 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
600 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
601 } else {
602 /* dir in/fwd => dst = local, src = remote */
603 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
604 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
605 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
606 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
607 }
608 }
609
610 /* re-insert all policies by order of creation */
611 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
6916fb3b
TB		 612 if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
613 /* skip socket policies */
614 continue;
615 }
880a6fab
CG		 616 newpos = NULL;
617 chain = policy_hash_bysel(net, &policy->selector,
618 policy->family,
619 xfrm_policy_id2dir(policy->index));
620 hlist_for_each_entry(pol, chain, bydst) {
621 if (policy->priority >= pol->priority)
622 newpos = &pol->bydst;
623 else
624 break;
625 }
626 if (newpos)
627 hlist_add_behind(&policy->bydst, newpos);
628 else
629 hlist_add_head(&policy->bydst, chain);
630 }
631
9d0380df 632 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 633
634 mutex_unlock(&hash_resize_mutex);
635}
636
637void xfrm_policy_hash_rebuild(struct net *net)
638{
639 schedule_work(&net->xfrm.policy_hthresh.work);
640}
641EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
642
1da177e4
LT		 643/* Generate new index... KAME seems to generate them ordered by cost
644 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 645static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 646{
1da177e4
LT		 647 static u32 idx_generator;
648
649 for (;;) {
2518c7c2
DM		 650 struct hlist_head *list;
651 struct xfrm_policy *p;
652 u32 idx;
653 int found;
654
e682adf0
FD		 655 if (!index) {
656 idx = (idx_generator | dir);
657 idx_generator += 8;
658 } else {
659 idx = index;
660 index = 0;
661 }
662
1da177e4
LT		 663 if (idx == 0)
664 idx = 8;
1121994c 665 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 666 found = 0;
b67bfe0d 667 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 668 if (p->index == idx) {
669 found = 1;
1da177e4 670 break;
2518c7c2 671 }
1da177e4 672 }
2518c7c2 673 if (!found)
1da177e4
LT		 674 return idx;
675 }
676}
677
2518c7c2
DM		 678static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
679{
680 u32 *p1 = (u32 *) s1;
681 u32 *p2 = (u32 *) s2;
682 int len = sizeof(struct xfrm_selector) / sizeof(u32);
683 int i;
684
685 for (i = 0; i < len; i++) {
686 if (p1[i] != p2[i])
687 return 1;
688 }
689
690 return 0;
691}
692
a0073fe1
SK		 693static void xfrm_policy_requeue(struct xfrm_policy *old,
694 struct xfrm_policy *new)
695{
696 struct xfrm_policy_queue *pq = &old->polq;
697 struct sk_buff_head list;
698
de2ad486
LR		 699 if (skb_queue_empty(&pq->hold_queue))
700 return;
701
a0073fe1
SK		 702 __skb_queue_head_init(&list);
703
704 spin_lock_bh(&pq->hold_queue.lock);
705 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 706 if (del_timer(&pq->hold_timer))
707 xfrm_pol_put(old);
a0073fe1
SK		 708 spin_unlock_bh(&pq->hold_queue.lock);
709
a0073fe1
SK		 710 pq = &new->polq;
711
712 spin_lock_bh(&pq->hold_queue.lock);
713 skb_queue_splice(&list, &pq->hold_queue);
714 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 715 if (!mod_timer(&pq->hold_timer, jiffies))
716 xfrm_pol_hold(new);
a0073fe1
SK		 717 spin_unlock_bh(&pq->hold_queue.lock);
718}
719
7cb8a939
SK		 720static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
721 struct xfrm_policy *pol)
722{
723 u32 mark = policy->mark.v & policy->mark.m;
724
725 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
726 return true;
727
728 if ((mark & pol->mark.m) == pol->mark.v &&
729 policy->priority == pol->priority)
730 return true;
731
732 return false;
733}
734
1da177e4
LT		 735int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
736{
1121994c 737 struct net *net = xp_net(policy);
2518c7c2
DM		 738 struct xfrm_policy *pol;
739 struct xfrm_policy *delpol;
740 struct hlist_head *chain;
b67bfe0d 741 struct hlist_node *newpos;
1da177e4 742
9d0380df 743 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1121994c 744 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM		 745 delpol = NULL;
746 newpos = NULL;
b67bfe0d 747 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 748 if (pol->type == policy->type &&
2518c7c2 749 !selector_cmp(&pol->selector, &policy->selector) &&
7cb8a939 750 xfrm_policy_mark_match(policy, pol) &&
a6c7ab55
HX		 751 xfrm_sec_ctx_match(pol->security, policy->security) &&
752 !WARN_ON(delpol)) {
1da177e4 753 if (excl) {
9d0380df 754 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 755 return -EEXIST;
756 }
1da177e4
LT		 757 delpol = pol;
758 if (policy->priority > pol->priority)
759 continue;
760 } else if (policy->priority >= pol->priority) {
a6c7ab55 761 newpos = &pol->bydst;
1da177e4
LT		 762 continue;
763 }
1da177e4
LT		 764 if (delpol)
765 break;
1da177e4
LT		 766 }
767 if (newpos)
1d023284 768 hlist_add_behind(&policy->bydst, newpos);
2518c7c2
DM		 769 else
770 hlist_add_head(&policy->bydst, chain);
12bfa8bd 771 __xfrm_policy_link(policy, dir);
ca4c3fc2 772
773 /* After previous checking, family can either be AF_INET or AF_INET6 */
774 if (policy->family == AF_INET)
775 rt_genid_bump_ipv4(net);
776 else
777 rt_genid_bump_ipv6(net);
778
a0073fe1
SK		 779 if (delpol) {
780 xfrm_policy_requeue(delpol, policy);
29fa0b30 781 __xfrm_policy_unlink(delpol, dir);
a0073fe1 782 }
e682adf0 783 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 784 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 785 policy->curlft.add_time = get_seconds();
1da177e4
LT		 786 policy->curlft.use_time = 0;
787 if (!mod_timer(&policy->timer, jiffies + HZ))
788 xfrm_pol_hold(policy);
9d0380df 789 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 790
9b78a82c 791 if (delpol)
1da177e4 792 xfrm_policy_kill(delpol);
1121994c
AD		 793 else if (xfrm_bydst_should_resize(net, dir, NULL))
794 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 795
1da177e4
LT		 796 return 0;
797}
798EXPORT_SYMBOL(xfrm_policy_insert);
799
8ca2e93b
JHS		 800struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
801 int dir, struct xfrm_selector *sel,
ef41aaa0
EP		 802 struct xfrm_sec_ctx *ctx, int delete,
803 int *err)
1da177e4 804{
2518c7c2
DM		 805 struct xfrm_policy *pol, *ret;
806 struct hlist_head *chain;
1da177e4 807
ef41aaa0 808 *err = 0;
9d0380df 809 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 810 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2 811 ret = NULL;
b67bfe0d 812 hlist_for_each_entry(pol, chain, bydst) {
2518c7c2 813 if (pol->type == type &&
34f8d884 814 (mark & pol->mark.m) == pol->mark.v &&
2518c7c2
DM		 815 !selector_cmp(sel, &pol->selector) &&
816 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 817 xfrm_pol_hold(pol);
2518c7c2 818 if (delete) {
03e1ad7b
PM		 819 *err = security_xfrm_policy_delete(
820 pol->security);
ef41aaa0 821 if (*err) {
9d0380df 822 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 823 return pol;
824 }
29fa0b30 825 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 826 }
827 ret = pol;
1da177e4
LT		 828 break;
829 }
830 }
9d0380df 831 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 832
fe1a5f03 833 if (ret && delete)
2518c7c2 834 xfrm_policy_kill(ret);
2518c7c2 835 return ret;
1da177e4 836}
df71837d 837EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 838
8ca2e93b
JHS		 839struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
840 int dir, u32 id, int delete, int *err)
1da177e4 841{
2518c7c2
DM		 842 struct xfrm_policy *pol, *ret;
843 struct hlist_head *chain;
1da177e4 844
b5505c6e
HX		 845 *err = -ENOENT;
846 if (xfrm_policy_id2dir(id) != dir)
847 return NULL;
848
ef41aaa0 849 *err = 0;
9d0380df 850 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 851 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 852 ret = NULL;
b67bfe0d 853 hlist_for_each_entry(pol, chain, byidx) {
34f8d884
JHS		 854 if (pol->type == type && pol->index == id &&
855 (mark & pol->mark.m) == pol->mark.v) {
1da177e4 856 xfrm_pol_hold(pol);
2518c7c2 857 if (delete) {
03e1ad7b
PM		 858 *err = security_xfrm_policy_delete(
859 pol->security);
ef41aaa0 860 if (*err) {
9d0380df 861 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 862 return pol;
863 }
29fa0b30 864 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 865 }
866 ret = pol;
1da177e4
LT		 867 break;
868 }
869 }
9d0380df 870 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 871
fe1a5f03 872 if (ret && delete)
2518c7c2 873 xfrm_policy_kill(ret);
2518c7c2 874 return ret;
1da177e4
LT		 875}
876EXPORT_SYMBOL(xfrm_policy_byid);
877
4aa2e62c
JL		 878#ifdef CONFIG_SECURITY_NETWORK_XFRM
879static inline int
2e71029e 880xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
1da177e4 881{
4aa2e62c
JL		 882 int dir, err = 0;
883
884 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
885 struct xfrm_policy *pol;
4aa2e62c
JL		 886 int i;
887
b67bfe0d 888 hlist_for_each_entry(pol,
33ffbbd5 889 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL		 890 if (pol->type != type)
891 continue;
03e1ad7b 892 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 893 if (err) {
2e71029e 894 xfrm_audit_policy_delete(pol, 0, task_valid);
4aa2e62c
JL		 895 return err;
896 }
7dc12d6d 897 }
33ffbbd5 898 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
b67bfe0d 899 hlist_for_each_entry(pol,
33ffbbd5 900 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL		 901 bydst) {
902 if (pol->type != type)
903 continue;
03e1ad7b
PM		 904 err = security_xfrm_policy_delete(
905 pol->security);
4aa2e62c 906 if (err) {
ab5f5e8b 907 xfrm_audit_policy_delete(pol, 0,
2e71029e 908 task_valid);
4aa2e62c
JL		 909 return err;
910 }
911 }
912 }
913 }
914 return err;
915}
916#else
917static inline int
2e71029e 918xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
4aa2e62c
JL		 919{
920 return 0;
921}
922#endif
923
2e71029e 924int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
4aa2e62c 925{
2f1eb65f 926 int dir, err = 0, cnt = 0;
1da177e4 927
9d0380df 928 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 929
2e71029e 930 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
4aa2e62c
JL		 931 if (err)
932 goto out;
933
1da177e4 934 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2 935 struct xfrm_policy *pol;
29fa0b30 936 int i;
2518c7c2
DM		 937
938 again1:
b67bfe0d 939 hlist_for_each_entry(pol,
33ffbbd5 940 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM		 941 if (pol->type != type)
942 continue;
ea2dea9d 943 __xfrm_policy_unlink(pol, dir);
9d0380df 944 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 945 cnt++;
1da177e4 946
2e71029e 947 xfrm_audit_policy_delete(pol, 1, task_valid);
161a09e7 948
2518c7c2 949 xfrm_policy_kill(pol);
1da177e4 950
4141b36a 951 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 952 goto again1;
953 }
954
33ffbbd5 955 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2 956 again2:
b67bfe0d 957 hlist_for_each_entry(pol,
33ffbbd5 958 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM		 959 bydst) {
960 if (pol->type != type)
961 continue;
ea2dea9d 962 __xfrm_policy_unlink(pol, dir);
9d0380df 963 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 964 cnt++;
2518c7c2 965
2e71029e 966 xfrm_audit_policy_delete(pol, 1, task_valid);
2518c7c2
DM		 967 xfrm_policy_kill(pol);
968
9d0380df 969 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 970 goto again2;
971 }
1da177e4 972 }
2518c7c2 973
1da177e4 974 }
2f1eb65f
JHS		 975 if (!cnt)
976 err = -ESRCH;
ec30d78c
FW		 977 else
978 xfrm_policy_cache_flush();
4aa2e62c 979out:
9d0380df 980 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 981 return err;
1da177e4
LT		 982}
983EXPORT_SYMBOL(xfrm_policy_flush);
984
cdcbca7c 985int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 986 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 987 void *data)
988{
12a169e7
HX		 989 struct xfrm_policy *pol;
990 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 991 int error = 0;
992
993 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
994 walk->type != XFRM_POLICY_TYPE_ANY)
995 return -EINVAL;
1da177e4 996
12a169e7 997 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 998 return 0;
999
9d0380df 1000 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 1001 if (list_empty(&walk->walk.all))
cdcbca7c 1002 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7 1003 else
80077702
LR		 1004 x = list_first_entry(&walk->walk.all,
1005 struct xfrm_policy_walk_entry, all);
1006
cdcbca7c 1007 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 1008 if (x->dead)
4c563f76 1009 continue;
12a169e7
HX		 1010 pol = container_of(x, struct xfrm_policy, walk);
1011 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1012 walk->type != pol->type)
1013 continue;
1014 error = func(pol, xfrm_policy_id2dir(pol->index),
1015 walk->seq, data);
1016 if (error) {
1017 list_move_tail(&walk->walk.all, &x->all);
1018 goto out;
2518c7c2 1019 }
12a169e7 1020 walk->seq++;
1da177e4 1021 }
12a169e7 1022 if (walk->seq == 0) {
baf5d743
JHS		 1023 error = -ENOENT;
1024 goto out;
1025 }
12a169e7 1026 list_del_init(&walk->walk.all);
1da177e4 1027out:
9d0380df 1028 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1029 return error;
1030}
1031EXPORT_SYMBOL(xfrm_policy_walk);
1032
12a169e7
HX		 1033void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1034{
1035 INIT_LIST_HEAD(&walk->walk.all);
1036 walk->walk.dead = 1;
1037 walk->type = type;
1038 walk->seq = 0;
1039}
1040EXPORT_SYMBOL(xfrm_policy_walk_init);
1041
283bc9f3 1042void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 1043{
1044 if (list_empty(&walk->walk.all))
1045 return;
1046
9d0380df 1047 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 1048 list_del(&walk->walk.all);
9d0380df 1049 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 1050}
1051EXPORT_SYMBOL(xfrm_policy_walk_done);
1052
134b0fc5
JM		 1053/*
1054 * Find policy to apply to this flow.
1055 *
1056 * Returns 0 if policy found, else an -errno.
1057 */
f299d557
DM		 1058static int xfrm_policy_match(const struct xfrm_policy *pol,
1059 const struct flowi *fl,
2518c7c2 1060 u8 type, u16 family, int dir)
1da177e4 1061{
f299d557 1062 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 1063 int ret = -ESRCH;
1064 bool match;
1da177e4 1065
2518c7c2 1066 if (pol->family != family ||
1d28f42c 1067 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 1068 pol->type != type)
134b0fc5 1069 return ret;
1da177e4 1070
2518c7c2 1071 match = xfrm_selector_match(sel, fl, family);
134b0fc5 1072 if (match)
1d28f42c 1073 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 1074 dir);
2518c7c2 1075
134b0fc5 1076 return ret;
2518c7c2 1077}
1da177e4 1078
52479b62 1079static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 1080 const struct flowi *fl,
2518c7c2
DM		 1081 u16 family, u8 dir)
1082{
134b0fc5 1083 int err;
2518c7c2 1084 struct xfrm_policy *pol, *ret;
0b597e7e 1085 const xfrm_address_t *daddr, *saddr;
2518c7c2 1086 struct hlist_head *chain;
30846090
FW		 1087 unsigned int sequence;
1088 u32 priority;
df71837d 1089
2518c7c2
DM		 1090 daddr = xfrm_flowi_daddr(fl, family);
1091 saddr = xfrm_flowi_saddr(fl, family);
1092 if (unlikely(!daddr || !saddr))
1093 return NULL;
1094
a7c44247 1095 rcu_read_lock();
30846090
FW		 1096 retry:
1097 do {
1098 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1099 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1100 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1101
1102 priority = ~0U;
2518c7c2 1103 ret = NULL;
a5eefc1d 1104 hlist_for_each_entry_rcu(pol, chain, bydst) {
134b0fc5
JM		 1105 err = xfrm_policy_match(pol, fl, type, family, dir);
1106 if (err) {
1107 if (err == -ESRCH)
1108 continue;
1109 else {
1110 ret = ERR_PTR(err);
1111 goto fail;
1112 }
1113 } else {
2518c7c2 1114 ret = pol;
acba48e1 1115 priority = ret->priority;
2518c7c2
DM		 1116 break;
1117 }
1118 }
52479b62 1119 chain = &net->xfrm.policy_inexact[dir];
a5eefc1d 1120 hlist_for_each_entry_rcu(pol, chain, bydst) {
8faf491e
LR		 1121 if ((pol->priority >= priority) && ret)
1122 break;
1123
134b0fc5
JM		 1124 err = xfrm_policy_match(pol, fl, type, family, dir);
1125 if (err) {
1126 if (err == -ESRCH)
1127 continue;
1128 else {
1129 ret = ERR_PTR(err);
1130 goto fail;
1131 }
8faf491e 1132 } else {
acba48e1
DM		 1133 ret = pol;
1134 break;
1da177e4
LT		 1135 }
1136 }
586f2eb4 1137
30846090
FW		 1138 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1139 goto retry;
1140
e37cc8ad
FW		 1141 if (ret && !xfrm_pol_hold_rcu(ret))
1142 goto retry;
134b0fc5 1143fail:
a7c44247 1144 rcu_read_unlock();
4e81bb83 1145
2518c7c2 1146 return ret;
4e81bb83
MN		 1147}
1148
80c802f3 1149static struct xfrm_policy *
86dc8ee0 1150xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1151{
1152#ifdef CONFIG_XFRM_SUB_POLICY
1153 struct xfrm_policy *pol;
1154
1155 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1156 if (pol != NULL)
1157 return pol;
1158#endif
1159 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1160}
1161
6f9c9615 1162static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
4c86d777 1163 const struct flowi *fl, u16 family)
1da177e4
LT		 1164{
1165 struct xfrm_policy *pol;
1166
d188ba86 1167 rcu_read_lock();
ae33786f 1168 again:
d188ba86
ED		 1169 pol = rcu_dereference(sk->sk_policy[dir]);
1170 if (pol != NULL) {
4c86d777 1171 bool match = xfrm_selector_match(&pol->selector, fl, family);
a716c119 1172 int err = 0;
df71837d 1173
3bccfbc7 1174 if (match) {
34f8d884
JHS		 1175 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1176 pol = NULL;
1177 goto out;
1178 }
03e1ad7b 1179 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1180 fl->flowi_secid,
aff669bc 1181 dir);
330e832a
FW		 1182 if (!err) {
1183 if (!xfrm_pol_hold_rcu(pol))
1184 goto again;
1185 } else if (err == -ESRCH) {
3bccfbc7 1186 pol = NULL;
330e832a 1187 } else {
3bccfbc7 1188 pol = ERR_PTR(err);
330e832a 1189 }
3bccfbc7 1190 } else
1da177e4
LT		 1191 pol = NULL;
1192 }
34f8d884 1193out:
d188ba86 1194 rcu_read_unlock();
1da177e4
LT		 1195 return pol;
1196}
1197
1198static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1199{
98806f75 1200 struct net *net = xp_net(pol);
4e81bb83 1201
98806f75 1202 list_add(&pol->walk.all, &net->xfrm.policy_all);
98806f75 1203 net->xfrm.policy_count[dir]++;
1da177e4
LT		 1204 xfrm_pol_hold(pol);
1205}
1206
1207static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1208 int dir)
1209{
98806f75
AD		 1210 struct net *net = xp_net(pol);
1211
53c2e285 1212 if (list_empty(&pol->walk.all))
2518c7c2 1213 return NULL;
1da177e4 1214
53c2e285
HX		 1215 /* Socket policies are not hashed. */
1216 if (!hlist_unhashed(&pol->bydst)) {
a5eefc1d 1217 hlist_del_rcu(&pol->bydst);
53c2e285
HX		 1218 hlist_del(&pol->byidx);
1219 }
1220
1221 list_del_init(&pol->walk.all);
98806f75 1222 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1223
1224 return pol;
1da177e4
LT		 1225}
1226
53c2e285
HX		 1227static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1228{
1229 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1230}
1231
1232static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1233{
1234 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1235}
1236
4666faab 1237int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1238{
283bc9f3
FD		 1239 struct net *net = xp_net(pol);
1240
9d0380df 1241 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1242 pol = __xfrm_policy_unlink(pol, dir);
9d0380df 1243 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1244 if (pol) {
1da177e4 1245 xfrm_policy_kill(pol);
4666faab 1246 return 0;
1da177e4 1247 }
4666faab 1248 return -ENOENT;
1da177e4 1249}
a70fcb0b 1250EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1251
1252int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1253{
1121994c 1254 struct net *net = xp_net(pol);
1da177e4
LT		 1255 struct xfrm_policy *old_pol;
1256
4e81bb83
MN		 1257#ifdef CONFIG_XFRM_SUB_POLICY
1258 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1259 return -EINVAL;
1260#endif
1261
9d0380df 1262 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
d188ba86
ED		 1263 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1264 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1da177e4 1265 if (pol) {
9d729f72 1266 pol->curlft.add_time = get_seconds();
e682adf0 1267 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
53c2e285 1268 xfrm_sk_policy_link(pol, dir);
1da177e4 1269 }
d188ba86 1270 rcu_assign_pointer(sk->sk_policy[dir], pol);
a0073fe1
SK		 1271 if (old_pol) {
1272 if (pol)
1273 xfrm_policy_requeue(old_pol, pol);
1274
ea2dea9d
TT		 1275 /* Unlinking succeeds always. This is the only function
1276 * allowed to delete or replace socket policy.
1277 */
53c2e285 1278 xfrm_sk_policy_unlink(old_pol, dir);
a0073fe1 1279 }
9d0380df 1280 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1281
1282 if (old_pol) {
1283 xfrm_policy_kill(old_pol);
1284 }
1285 return 0;
1286}
1287
d3e40a9f 1288static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1289{
0331b1f3 1290 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1291 struct net *net = xp_net(old);
1da177e4
LT		 1292
1293 if (newp) {
1294 newp->selector = old->selector;
03e1ad7b
PM		 1295 if (security_xfrm_policy_clone(old->security,
1296 &newp->security)) {
df71837d
TJ		 1297 kfree(newp);
1298 return NULL; /* ENOMEM */
1299 }
1da177e4
LT		 1300 newp->lft = old->lft;
1301 newp->curlft = old->curlft;
fb977e2c 1302 newp->mark = old->mark;
1da177e4
LT		 1303 newp->action = old->action;
1304 newp->flags = old->flags;
1305 newp->xfrm_nr = old->xfrm_nr;
1306 newp->index = old->index;
4e81bb83 1307 newp->type = old->type;
0e74aa1d 1308 newp->family = old->family;
1da177e4
LT		 1309 memcpy(newp->xfrm_vec, old->xfrm_vec,
1310 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
9d0380df 1311 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
53c2e285 1312 xfrm_sk_policy_link(newp, dir);
9d0380df 1313 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1314 xfrm_pol_put(newp);
1315 }
1316 return newp;
1317}
1318
d188ba86 1319int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1da177e4 1320{
d188ba86
ED		 1321 const struct xfrm_policy *p;
1322 struct xfrm_policy *np;
1323 int i, ret = 0;
1324
1325 rcu_read_lock();
1326 for (i = 0; i < 2; i++) {
1327 p = rcu_dereference(osk->sk_policy[i]);
1328 if (p) {
1329 np = clone_policy(p, i);
1330 if (unlikely(!np)) {
1331 ret = -ENOMEM;
1332 break;
1333 }
1334 rcu_assign_pointer(sk->sk_policy[i], np);
1335 }
1336 }
1337 rcu_read_unlock();
1338 return ret;
1da177e4
LT		 1339}
1340
a1e59abf 1341static int
42a7b32b 1342xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
077fbac4 1343 xfrm_address_t *remote, unsigned short family, u32 mark)
a1e59abf
PM		 1344{
1345 int err;
37b10383 1346 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
a1e59abf
PM		 1347
1348 if (unlikely(afinfo == NULL))
1349 return -EINVAL;
077fbac4 1350 err = afinfo->get_saddr(net, oif, local, remote, mark);
bdba9fe0 1351 rcu_read_unlock();
a1e59abf
PM		 1352 return err;
1353}
1354
1da177e4
LT		 1355/* Resolve list of templates for the flow, given policy. */
1356
1357static int
a6c2e611
DM		 1358xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1359 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1360{
fbda33b2 1361 struct net *net = xp_net(policy);
1da177e4
LT		 1362 int nx;
1363 int i, error;
94802151
SK		 1364 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1365 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1366 xfrm_address_t tmp;
1da177e4 1367
9b7a787d 1368 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4 1369 struct xfrm_state *x;
94802151
SK		 1370 xfrm_address_t *remote = daddr;
1371 xfrm_address_t *local = saddr;
1da177e4
LT		 1372 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1373
94802151
SK		 1374 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1375 tmpl->mode == XFRM_MODE_BEET) {
1376 remote = &tmpl->id.daddr;
1377 local = &tmpl->saddr;
1378 if (xfrm_addr_any(local, tmpl->encap_family)) {
1379 error = xfrm_get_saddr(net, fl->flowi_oif,
1380 &tmp, remote,
1381 tmpl->encap_family, 0);
1382 if (error)
1383 goto fail;
1384 local = &tmp;
1385 }
1da177e4
LT		 1386 }
1387
1388 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1389
1390 if (x && x->km.state == XFRM_STATE_VALID) {
1391 xfrm[nx++] = x;
94802151
SK		 1392 daddr = remote;
1393 saddr = local;
1da177e4
LT		 1394 continue;
1395 }
1396 if (x) {
1397 error = (x->km.state == XFRM_STATE_ERROR ?
1398 -EINVAL : -EAGAIN);
1399 xfrm_state_put(x);
42054569 1400 } else if (error == -ESRCH) {
a4322266 1401 error = -EAGAIN;
42054569 1402 }
1da177e4
LT		 1403
1404 if (!tmpl->optional)
1405 goto fail;
1406 }
1407 return nx;
1408
1409fail:
9b7a787d 1410 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1411 xfrm_state_put(xfrm[nx]);
1412 return error;
1413}
1414
4e81bb83 1415static int
a6c2e611
DM		 1416xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1417 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1418{
41a49cc3
MN		 1419 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1420 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1421 int cnx = 0;
1422 int error;
1423 int ret;
1424 int i;
1425
1426 for (i = 0; i < npols; i++) {
1427 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1428 error = -ENOBUFS;
1429 goto fail;
1430 }
41a49cc3
MN		 1431
1432 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1433 if (ret < 0) {
1434 error = ret;
1435 goto fail;
1436 } else
1437 cnx += ret;
1438 }
1439
41a49cc3
MN		 1440 /* found states are sorted for outbound processing */
1441 if (npols > 1)
1442 xfrm_state_sort(xfrm, tpp, cnx, family);
1443
4e81bb83
MN		 1444 return cnx;
1445
1446 fail:
9b7a787d 1447 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1448 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1449 return error;
1450
1451}
1452
f5e2bb4f 1453static int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286 1454{
37b10383 1455 const struct xfrm_policy_afinfo *afinfo;
f5e2bb4f 1456 int tos = 0;
1da177e4 1457
f5e2bb4f
FW		 1458 afinfo = xfrm_policy_get_afinfo(family);
1459 tos = afinfo ? afinfo->get_tos(fl) : 0;
25ee3286 1460
bdba9fe0 1461 rcu_read_unlock();
25ee3286
HX		 1462
1463 return tos;
1464}
1465
d7c7544c 1466static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1467{
37b10383 1468 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1469 struct dst_ops *dst_ops;
25ee3286
HX		 1470 struct xfrm_dst *xdst;
1471
1472 if (!afinfo)
1473 return ERR_PTR(-EINVAL);
1474
d7c7544c
AD		 1475 switch (family) {
1476 case AF_INET:
1477 dst_ops = &net->xfrm.xfrm4_dst_ops;
1478 break;
dfd56b8b 1479#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1480 case AF_INET6:
1481 dst_ops = &net->xfrm.xfrm6_dst_ops;
1482 break;
1483#endif
1484 default:
1485 BUG();
1486 }
b2a9c0ed 1487 xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
25ee3286 1488
d4cae562 1489 if (likely(xdst)) {
141e369d
SK		 1490 struct dst_entry *dst = &xdst->u.dst;
1491
1492 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
d4cae562 1493 } else
0b150932 1494 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1495
bdba9fe0 1496 rcu_read_unlock();
d4cae562 1497
25ee3286
HX		 1498 return xdst;
1499}
1500
a1b05140
MN		 1501static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1502 int nfheader_len)
1503{
37b10383 1504 const struct xfrm_policy_afinfo *afinfo =
a1b05140
MN		 1505 xfrm_policy_get_afinfo(dst->ops->family);
1506 int err;
1507
1508 if (!afinfo)
1509 return -EINVAL;
1510
1511 err = afinfo->init_path(path, dst, nfheader_len);
1512
bdba9fe0 1513 rcu_read_unlock();
a1b05140
MN		 1514
1515 return err;
1516}
1517
87c1e12b 1518static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1519 const struct flowi *fl)
25ee3286 1520{
37b10383 1521 const struct xfrm_policy_afinfo *afinfo =
25ee3286
HX		 1522 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1523 int err;
1524
1525 if (!afinfo)
1da177e4 1526 return -EINVAL;
25ee3286 1527
87c1e12b 1528 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1529
bdba9fe0 1530 rcu_read_unlock();
25ee3286 1531
1da177e4
LT		 1532 return err;
1533}
1534
80c802f3 1535
25ee3286
HX		 1536/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1537 * all the metrics... Shortly, bundle a bundle.
1538 */
1539
1540static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1541 struct xfrm_state **xfrm, int nx,
98313ada 1542 const struct flowi *fl,
25ee3286
HX		 1543 struct dst_entry *dst)
1544{
d7c7544c 1545 struct net *net = xp_net(policy);
25ee3286
HX		 1546 unsigned long now = jiffies;
1547 struct net_device *dev;
43a4dea4 1548 struct xfrm_mode *inner_mode;
25ee3286
HX		 1549 struct dst_entry *dst_prev = NULL;
1550 struct dst_entry *dst0 = NULL;
1551 int i = 0;
1552 int err;
1553 int header_len = 0;
a1b05140 1554 int nfheader_len = 0;
25ee3286
HX		 1555 int trailer_len = 0;
1556 int tos;
1557 int family = policy->selector.family;
9bb182a7
YH		 1558 xfrm_address_t saddr, daddr;
1559
1560 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1561
1562 tos = xfrm_get_tos(fl, family);
25ee3286
HX		 1563
1564 dst_hold(dst);
1565
1566 for (; i < nx; i++) {
d7c7544c 1567 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1568 struct dst_entry *dst1 = &xdst->u.dst;
1569
1570 err = PTR_ERR(xdst);
1571 if (IS_ERR(xdst)) {
1572 dst_release(dst);
1573 goto put_states;
1574 }
1575
10a7ef33
DM		 1576 if (!dst_prev)
1577 dst0 = dst1;
1578 else
1579 /* Ref count is taken during xfrm_alloc_dst()
1580 * No need to do dst_clone() on dst1
1581 */
1582 dst_prev->child = dst1;
1583
43a4dea4
SK		 1584 if (xfrm[i]->sel.family == AF_UNSPEC) {
1585 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1586 xfrm_af2proto(family));
1587 if (!inner_mode) {
1588 err = -EAFNOSUPPORT;
1589 dst_release(dst);
1590 goto put_states;
1591 }
1592 } else
1593 inner_mode = xfrm[i]->inner_mode;
1594
25ee3286 1595 xdst->route = dst;
defb3519 1596 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1597
1598 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1599 family = xfrm[i]->props.family;
42a7b32b 1600 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
077fbac4
LC		 1601 &saddr, &daddr, family,
1602 xfrm[i]->props.output_mark);
25ee3286
HX		 1603 err = PTR_ERR(dst);
1604 if (IS_ERR(dst))
1605 goto put_states;
1606 } else
1607 dst_hold(dst);
1608
1609 dst1->xfrm = xfrm[i];
80c802f3 1610 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1611
f5b0a874 1612 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1613 dst1->flags |= DST_HOST;
1614 dst1->lastuse = now;
1615
1616 dst1->input = dst_discard;
43a4dea4 1617 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1618
1619 dst1->next = dst_prev;
1620 dst_prev = dst1;
1621
1622 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1623 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1624 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1625 trailer_len += xfrm[i]->props.trailer_len;
1626 }
1627
1628 dst_prev->child = dst;
1629 dst0->path = dst;
1630
1631 err = -ENODEV;
1632 dev = dst->dev;
1633 if (!dev)
1634 goto free_dst;
1635
a1b05140 1636 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1637 xfrm_init_pmtu(dst_prev);
1638
1639 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1640 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1641
87c1e12b 1642 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1643 if (err)
1644 goto free_dst;
1645
1646 dst_prev->header_len = header_len;
1647 dst_prev->trailer_len = trailer_len;
1648 header_len -= xdst->u.dst.xfrm->props.header_len;
1649 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1650 }
1651
1652out:
1653 return dst0;
1654
1655put_states:
1656 for (; i < nx; i++)
1657 xfrm_state_put(xfrm[i]);
1658free_dst:
1659 if (dst0)
52df157f 1660 dst_release_immediate(dst0);
25ee3286
HX		 1661 dst0 = ERR_PTR(err);
1662 goto out;
1663}
1664
73ff93cd 1665static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1666 struct xfrm_policy **pols,
1667 int *num_pols, int *num_xfrms)
1668{
1669 int i;
1670
1671 if (*num_pols == 0 || !pols[0]) {
1672 *num_pols = 0;
1673 *num_xfrms = 0;
1674 return 0;
1675 }
1676 if (IS_ERR(pols[0]))
1677 return PTR_ERR(pols[0]);
1678
1679 *num_xfrms = pols[0]->xfrm_nr;
1680
1681#ifdef CONFIG_XFRM_SUB_POLICY
1682 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1683 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1684 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1685 XFRM_POLICY_TYPE_MAIN,
1686 fl, family,
1687 XFRM_POLICY_OUT);
1688 if (pols[1]) {
1689 if (IS_ERR(pols[1])) {
1690 xfrm_pols_put(pols, *num_pols);
1691 return PTR_ERR(pols[1]);
1692 }
02d0892f 1693 (*num_pols)++;
80c802f3
TT		 1694 (*num_xfrms) += pols[1]->xfrm_nr;
1695 }
1696 }
1697#endif
1698 for (i = 0; i < *num_pols; i++) {
1699 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1700 *num_xfrms = -1;
1701 break;
1702 }
1703 }
1704
1705 return 0;
1706
1707}
1708
ec30d78c
FW		 1709static void xfrm_last_dst_update(struct xfrm_dst *xdst, struct xfrm_dst *old)
1710{
1711 this_cpu_write(xfrm_last_dst, xdst);
1712 if (old)
1713 dst_release(&old->u.dst);
1714}
1715
1716static void __xfrm_pcpu_work_fn(void)
1717{
1718 struct xfrm_dst *old;
1719
1720 old = this_cpu_read(xfrm_last_dst);
1721 if (old && !xfrm_bundle_ok(old))
1722 xfrm_last_dst_update(NULL, old);
1723}
1724
1725static void xfrm_pcpu_work_fn(struct work_struct *work)
1726{
1727 local_bh_disable();
1728 rcu_read_lock();
1729 __xfrm_pcpu_work_fn();
1730 rcu_read_unlock();
1731 local_bh_enable();
1732}
1733
1734void xfrm_policy_cache_flush(void)
1735{
1736 struct xfrm_dst *old;
1737 bool found = 0;
1738 int cpu;
1739
1740 local_bh_disable();
1741 rcu_read_lock();
1742 for_each_possible_cpu(cpu) {
1743 old = per_cpu(xfrm_last_dst, cpu);
1744 if (old && !xfrm_bundle_ok(old)) {
1745 if (smp_processor_id() == cpu) {
1746 __xfrm_pcpu_work_fn();
1747 continue;
1748 }
1749 found = true;
1750 break;
1751 }
1752 }
1753
1754 rcu_read_unlock();
1755 local_bh_enable();
1756
1757 if (!found)
1758 return;
1759
1760 get_online_cpus();
1761
1762 for_each_possible_cpu(cpu) {
1763 bool bundle_release;
1764
1765 rcu_read_lock();
1766 old = per_cpu(xfrm_last_dst, cpu);
1767 bundle_release = old && !xfrm_bundle_ok(old);
1768 rcu_read_unlock();
1769
1770 if (!bundle_release)
1771 continue;
1772
1773 if (cpu_online(cpu)) {
1774 schedule_work_on(cpu, &xfrm_pcpu_work[cpu]);
1775 continue;
1776 }
1777
1778 rcu_read_lock();
1779 old = per_cpu(xfrm_last_dst, cpu);
1780 if (old && !xfrm_bundle_ok(old)) {
1781 per_cpu(xfrm_last_dst, cpu) = NULL;
1782 dst_release(&old->u.dst);
1783 }
1784 rcu_read_unlock();
1785 }
1786
1787 put_online_cpus();
1788}
1789
cf379667
FW		 1790static bool xfrm_xdst_can_reuse(struct xfrm_dst *xdst,
1791 struct xfrm_state * const xfrm[],
1792 int num)
ec30d78c 1793{
cf379667
FW		 1794 const struct dst_entry *dst = &xdst->u.dst;
1795 int i;
ec30d78c 1796
cf379667
FW		 1797 if (xdst->num_xfrms != num)
1798 return false;
ec30d78c 1799
cf379667
FW		 1800 for (i = 0; i < num; i++) {
1801 if (!dst || dst->xfrm != xfrm[i])
1802 return false;
1803 dst = dst->child;
1804 }
ec30d78c 1805
cf379667 1806 return xfrm_bundle_ok(xdst);
ec30d78c
FW		 1807}
1808
80c802f3
TT		 1809static struct xfrm_dst *
1810xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1811 const struct flowi *fl, u16 family,
80c802f3
TT		 1812 struct dst_entry *dst_orig)
1813{
1814 struct net *net = xp_net(pols[0]);
1815 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
ec30d78c 1816 struct xfrm_dst *xdst, *old;
80c802f3 1817 struct dst_entry *dst;
80c802f3
TT		 1818 int err;
1819
cf379667
FW		 1820 /* Try to instantiate a bundle */
1821 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1822 if (err <= 0) {
1823 if (err != 0 && err != -EAGAIN)
1824 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1825 return ERR_PTR(err);
1826 }
1827
ec30d78c
FW		 1828 xdst = this_cpu_read(xfrm_last_dst);
1829 if (xdst &&
1830 xdst->u.dst.dev == dst_orig->dev &&
1831 xdst->num_pols == num_pols &&
ec30d78c 1832 memcmp(xdst->pols, pols,
13ead5c4 1833 sizeof(struct xfrm_policy *) * num_pols) == 0 &&
cf379667 1834 xfrm_xdst_can_reuse(xdst, xfrm, err)) {
ec30d78c 1835 dst_hold(&xdst->u.dst);
cf379667
FW		 1836 while (err > 0)
1837 xfrm_state_put(xfrm[--err]);
ec30d78c
FW		 1838 return xdst;
1839 }
1840
1841 old = xdst;
80c802f3
TT		 1842
1843 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1844 if (IS_ERR(dst)) {
1845 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1846 return ERR_CAST(dst);
1847 }
1848
1849 xdst = (struct xfrm_dst *)dst;
1850 xdst->num_xfrms = err;
80c802f3 1851 xdst->num_pols = num_pols;
3e94c2dc 1852 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1853 xdst->policy_genid = atomic_read(&pols[0]->genid);
1854
ec30d78c
FW		 1855 atomic_set(&xdst->u.dst.__refcnt, 2);
1856 xfrm_last_dst_update(xdst, old);
1857
80c802f3
TT		 1858 return xdst;
1859}
1860
c3aed709 1861static void xfrm_policy_queue_process(struct timer_list *t)
a0073fe1 1862{
a0073fe1
SK		 1863 struct sk_buff *skb;
1864 struct sock *sk;
1865 struct dst_entry *dst;
c3aed709 1866 struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer);
3f5312ae 1867 struct net *net = xp_net(pol);
a0073fe1
SK		 1868 struct xfrm_policy_queue *pq = &pol->polq;
1869 struct flowi fl;
1870 struct sk_buff_head list;
1871
1872 spin_lock(&pq->hold_queue.lock);
1873 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1874 if (!skb) {
1875 spin_unlock(&pq->hold_queue.lock);
1876 goto out;
1877 }
a0073fe1
SK		 1878 dst = skb_dst(skb);
1879 sk = skb->sk;
1880 xfrm_decode_session(skb, &fl, dst->ops->family);
1881 spin_unlock(&pq->hold_queue.lock);
1882
1883 dst_hold(dst->path);
3f5312ae 1884 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
a0073fe1
SK		 1885 if (IS_ERR(dst))
1886 goto purge_queue;
1887
1888 if (dst->flags & DST_XFRM_QUEUE) {
1889 dst_release(dst);
1890
1891 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1892 goto purge_queue;
1893
1894 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1895 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1896 xfrm_pol_hold(pol);
1897 goto out;
a0073fe1
SK		 1898 }
1899
1900 dst_release(dst);
1901
1902 __skb_queue_head_init(&list);
1903
1904 spin_lock(&pq->hold_queue.lock);
1905 pq->timeout = 0;
1906 skb_queue_splice_init(&pq->hold_queue, &list);
1907 spin_unlock(&pq->hold_queue.lock);
1908
1909 while (!skb_queue_empty(&list)) {
1910 skb = __skb_dequeue(&list);
1911
1912 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1913 dst_hold(skb_dst(skb)->path);
3f5312ae 1914 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
a0073fe1 1915 if (IS_ERR(dst)) {
a0073fe1
SK		 1916 kfree_skb(skb);
1917 continue;
1918 }
1919
1920 nf_reset(skb);
1921 skb_dst_drop(skb);
1922 skb_dst_set(skb, dst);
1923
13206b6b 1924 dst_output(net, skb->sk, skb);
a0073fe1
SK		 1925 }
1926
e7d8f6cb
SK		 1927out:
1928 xfrm_pol_put(pol);
a0073fe1
SK		 1929 return;
1930
1931purge_queue:
1932 pq->timeout = 0;
1ee5e667 1933 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 1934 xfrm_pol_put(pol);
a0073fe1
SK		 1935}
1936
ede2059d 1937static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 1938{
1939 unsigned long sched_next;
1940 struct dst_entry *dst = skb_dst(skb);
1941 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 1942 struct xfrm_policy *pol = xdst->pols[0];
1943 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 1944
39bb5e62 1945 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 1946 kfree_skb(skb);
1947 return 0;
1948 }
a0073fe1
SK		 1949
1950 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1951 kfree_skb(skb);
1952 return -EAGAIN;
1953 }
1954
1955 skb_dst_force(skb);
a0073fe1
SK		 1956
1957 spin_lock_bh(&pq->hold_queue.lock);
1958
1959 if (!pq->timeout)
1960 pq->timeout = XFRM_QUEUE_TMO_MIN;
1961
1962 sched_next = jiffies + pq->timeout;
1963
1964 if (del_timer(&pq->hold_timer)) {
1965 if (time_before(pq->hold_timer.expires, sched_next))
1966 sched_next = pq->hold_timer.expires;
e7d8f6cb 1967 xfrm_pol_put(pol);
a0073fe1
SK		 1968 }
1969
1970 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 1971 if (!mod_timer(&pq->hold_timer, sched_next))
1972 xfrm_pol_hold(pol);
a0073fe1
SK		 1973
1974 spin_unlock_bh(&pq->hold_queue.lock);
1975
1976 return 0;
1977}
1978
1979static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 1980 struct xfrm_flo *xflo,
a0073fe1
SK		 1981 const struct flowi *fl,
1982 int num_xfrms,
1983 u16 family)
1984{
1985 int err;
1986 struct net_device *dev;
b8c203b2 1987 struct dst_entry *dst;
a0073fe1
SK		 1988 struct dst_entry *dst1;
1989 struct xfrm_dst *xdst;
1990
1991 xdst = xfrm_alloc_dst(net, family);
1992 if (IS_ERR(xdst))
1993 return xdst;
1994
b8c203b2
SK		 1995 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
1996 net->xfrm.sysctl_larval_drop ||
1997 num_xfrms <= 0)
a0073fe1
SK		 1998 return xdst;
1999
b8c203b2 2000 dst = xflo->dst_orig;
a0073fe1
SK		 2001 dst1 = &xdst->u.dst;
2002 dst_hold(dst);
2003 xdst->route = dst;
2004
2005 dst_copy_metrics(dst1, dst);
2006
2007 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2008 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2009 dst1->lastuse = jiffies;
2010
2011 dst1->input = dst_discard;
2012 dst1->output = xdst_queue_output;
2013
2014 dst_hold(dst);
2015 dst1->child = dst;
2016 dst1->path = dst;
2017
2018 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2019
2020 err = -ENODEV;
2021 dev = dst->dev;
2022 if (!dev)
2023 goto free_dst;
2024
2025 err = xfrm_fill_dst(xdst, dev, fl);
2026 if (err)
2027 goto free_dst;
2028
2029out:
2030 return xdst;
2031
2032free_dst:
2033 dst_release(dst1);
2034 xdst = ERR_PTR(err);
2035 goto out;
2036}
2037
bd45c539 2038static struct xfrm_dst *
3ca28286 2039xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, struct xfrm_flo *xflo)
80c802f3 2040{
80c802f3 2041 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
855dad99 2042 int num_pols = 0, num_xfrms = 0, err;
bd45c539 2043 struct xfrm_dst *xdst;
80c802f3 2044
80c802f3
TT		 2045 /* Resolve policies to use if we couldn't get them from
2046 * previous cache entry */
855dad99 2047 num_pols = 1;
86dc8ee0 2048 pols[0] = xfrm_policy_lookup(net, fl, family, dir);
855dad99 2049 err = xfrm_expand_policies(fl, family, pols,
80c802f3 2050 &num_pols, &num_xfrms);
855dad99
FW		 2051 if (err < 0)
2052 goto inc_error;
2053 if (num_pols == 0)
2054 return NULL;
2055 if (num_xfrms <= 0)
2056 goto make_dummy_bundle;
80c802f3 2057
bd45c539 2058 xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
b8c203b2 2059 xflo->dst_orig);
bd45c539
FW		 2060 if (IS_ERR(xdst)) {
2061 err = PTR_ERR(xdst);
80c802f3
TT		 2062 if (err != -EAGAIN)
2063 goto error;
855dad99 2064 goto make_dummy_bundle;
bd45c539 2065 } else if (xdst == NULL) {
d809ec89 2066 num_xfrms = 0;
855dad99 2067 goto make_dummy_bundle;
80c802f3
TT		 2068 }
2069
bd45c539 2070 return xdst;
80c802f3
TT		 2071
2072make_dummy_bundle:
2073 /* We found policies, but there's no bundles to instantiate:
2074 * either because the policy blocks, has no transformations or
2075 * we could not build template (no xfrm_states).*/
b8c203b2 2076 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 2077 if (IS_ERR(xdst)) {
2078 xfrm_pols_put(pols, num_pols);
2079 return ERR_CAST(xdst);
2080 }
2081 xdst->num_pols = num_pols;
2082 xdst->num_xfrms = num_xfrms;
3e94c2dc 2083 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3 2084
bd45c539 2085 return xdst;
80c802f3
TT		 2086
2087inc_error:
2088 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2089error:
855dad99 2090 xfrm_pols_put(pols, num_pols);
80c802f3
TT		 2091 return ERR_PTR(err);
2092}
1da177e4 2093
2774c131
DM		 2094static struct dst_entry *make_blackhole(struct net *net, u16 family,
2095 struct dst_entry *dst_orig)
2096{
37b10383 2097 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2774c131
DM		 2098 struct dst_entry *ret;
2099
2100 if (!afinfo) {
2101 dst_release(dst_orig);
433a1954 2102 return ERR_PTR(-EINVAL);
2774c131
DM		 2103 } else {
2104 ret = afinfo->blackhole_route(net, dst_orig);
2105 }
bdba9fe0 2106 rcu_read_unlock();
2774c131
DM		 2107
2108 return ret;
2109}
2110
1da177e4
LT		 2111/* Main function: finds/creates a bundle for given flow.
2112 *
2113 * At the moment we eat a raw IP route. Mostly to speed up lookups
2114 * on interfaces with disabled IPsec.
2115 */
452edd59
DM		 2116struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2117 const struct flowi *fl,
6f9c9615 2118 const struct sock *sk, int flags)
1da177e4 2119{
4e81bb83 2120 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3 2121 struct xfrm_dst *xdst;
452edd59 2122 struct dst_entry *dst, *route;
80c802f3 2123 u16 family = dst_orig->ops->family;
aff669bc 2124 u8 dir = XFRM_POLICY_OUT;
4b021628 2125 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2126
80c802f3
TT		 2127 dst = NULL;
2128 xdst = NULL;
2129 route = NULL;
4e81bb83 2130
bd5eb35f 2131 sk = sk_const_to_full_sk(sk);
f7944fb1 2132 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3 2133 num_pols = 1;
4c86d777 2134 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
80c802f3
TT		 2135 err = xfrm_expand_policies(fl, family, pols,
2136 &num_pols, &num_xfrms);
2137 if (err < 0)
75b8c133 2138 goto dropdst;
80c802f3
TT		 2139
2140 if (num_pols) {
2141 if (num_xfrms <= 0) {
2142 drop_pols = num_pols;
2143 goto no_transform;
2144 }
2145
2146 xdst = xfrm_resolve_and_create_bundle(
2147 pols, num_pols, fl,
2148 family, dst_orig);
2149 if (IS_ERR(xdst)) {
2150 xfrm_pols_put(pols, num_pols);
2151 err = PTR_ERR(xdst);
2152 goto dropdst;
d809ec89
TT		 2153 } else if (xdst == NULL) {
2154 num_xfrms = 0;
2155 drop_pols = num_pols;
2156 goto no_transform;
80c802f3
TT		 2157 }
2158
80c802f3 2159 route = xdst->route;
0aa64774 2160 }
3bccfbc7 2161 }
1da177e4 2162
80c802f3 2163 if (xdst == NULL) {
b8c203b2
SK		 2164 struct xfrm_flo xflo;
2165
2166 xflo.dst_orig = dst_orig;
2167 xflo.flags = flags;
2168
1da177e4 2169 /* To accelerate a bit... */
2518c7c2 2170 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2171 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2172 goto nopol;
1da177e4 2173
bd45c539
FW		 2174 xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo);
2175 if (xdst == NULL)
80c802f3 2176 goto nopol;
bd45c539
FW		 2177 if (IS_ERR(xdst)) {
2178 err = PTR_ERR(xdst);
75b8c133 2179 goto dropdst;
d66e37a9 2180 }
80c802f3
TT		 2181
2182 num_pols = xdst->num_pols;
2183 num_xfrms = xdst->num_xfrms;
3e94c2dc 2184 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2185 route = xdst->route;
2186 }
2187
2188 dst = &xdst->u.dst;
2189 if (route == NULL && num_xfrms > 0) {
2190 /* The only case when xfrm_bundle_lookup() returns a
2191 * bundle with null route, is when the template could
2192 * not be resolved. It means policies are there, but
2193 * bundle could not be created, since we don't yet
2194 * have the xfrm_state's. We need to wait for KM to
2195 * negotiate new SA's or bail out with error.*/
2196 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2197 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 2198 err = -EREMOTE;
2199 goto error;
80c802f3 2200 }
80c802f3 2201
5b8ef341 2202 err = -EAGAIN;
80c802f3
TT		 2203
2204 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2205 goto error;
1da177e4
LT		 2206 }
2207
80c802f3
TT		 2208no_transform:
2209 if (num_pols == 0)
8b7817f3 2210 goto nopol;
1da177e4 2211
80c802f3
TT		 2212 if ((flags & XFRM_LOOKUP_ICMP) &&
2213 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2214 err = -ENOENT;
8b7817f3 2215 goto error;
80c802f3 2216 }
8b7817f3 2217
80c802f3
TT		 2218 for (i = 0; i < num_pols; i++)
2219 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2220
80c802f3 2221 if (num_xfrms < 0) {
1da177e4 2222 /* Prohibit the flow */
59c9940e 2223 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2224 err = -EPERM;
2225 goto error;
80c802f3
TT		 2226 } else if (num_xfrms > 0) {
2227 /* Flow transformed */
80c802f3
TT		 2228 dst_release(dst_orig);
2229 } else {
2230 /* Flow passes untransformed */
2231 dst_release(dst);
452edd59 2232 dst = dst_orig;
1da177e4 2233 }
80c802f3
TT		 2234ok:
2235 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2236 if (dst && dst->xfrm &&
2237 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2238 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2239 return dst;
1da177e4 2240
80c802f3 2241nopol:
452edd59
DM		 2242 if (!(flags & XFRM_LOOKUP_ICMP)) {
2243 dst = dst_orig;
80c802f3 2244 goto ok;
452edd59 2245 }
80c802f3 2246 err = -ENOENT;
1da177e4 2247error:
80c802f3 2248 dst_release(dst);
75b8c133 2249dropdst:
ac37e251
W		 2250 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2251 dst_release(dst_orig);
80c802f3 2252 xfrm_pols_put(pols, drop_pols);
452edd59 2253 return ERR_PTR(err);
1da177e4
LT		 2254}
2255EXPORT_SYMBOL(xfrm_lookup);
2256
f92ee619
SK		 2257/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2258 * Otherwise we may send out blackholed packets.
2259 */
2260struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2261 const struct flowi *fl,
6f9c9615 2262 const struct sock *sk, int flags)
f92ee619 2263{
b8c203b2 2264 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 2265 flags | XFRM_LOOKUP_QUEUE |
2266 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619
SK		 2267
2268 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2269 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2270
2271 return dst;
2272}
2273EXPORT_SYMBOL(xfrm_lookup_route);
2274
df0ba92a 2275static inline int
8f029de2 2276xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2277{
2278 struct xfrm_state *x;
df0ba92a
MN		 2279
2280 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2281 return 0;
2282 x = skb->sp->xvec[idx];
2283 if (!x->type->reject)
2284 return 0;
1ecafede 2285 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2286}
2287
1da177e4
LT		 2288/* When skb is transformed back to its "native" form, we have to
2289 * check policy restrictions. At the moment we make this in maximally
2290 * stupid way. Shame on me. :-) Of course, connected sockets must
2291 * have policy cached at them.
2292 */
2293
2294static inline int
7db454b9 2295xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2296 unsigned short family)
2297{
2298 if (xfrm_state_kern(x))
928ba416 2299 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2300 return x->id.proto == tmpl->id.proto &&
2301 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2302 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2303 x->props.mode == tmpl->mode &&
c5d18e98 2304 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2305 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2306 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2307 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2308}
2309
df0ba92a
MN		 2310/*
2311 * 0 or more than 0 is returned when validation is succeeded (either bypass
2312 * because of optional transport mode, or next index of the mathced secpath
2313 * state with the template.
2314 * -1 is returned when no matching template is found.
2315 * Otherwise "-2 - errored_index" is returned.
2316 */
1da177e4 2317static inline int
22cccb7e 2318xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2319 unsigned short family)
2320{
2321 int idx = start;
2322
2323 if (tmpl->optional) {
7e49e6de 2324 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2325 return start;
2326 } else
2327 start = -1;
2328 for (; idx < sp->len; idx++) {
dbe5b4aa 2329 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2330 return ++idx;
df0ba92a
MN		 2331 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2332 if (start == -1)
2333 start = -2-idx;
1da177e4 2334 break;
df0ba92a 2335 }
1da177e4
LT		 2336 }
2337 return start;
2338}
2339
d5422efe
HX		 2340int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2341 unsigned int family, int reverse)
1da177e4 2342{
37b10383 2343 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2344 int err;
1da177e4
LT		 2345
2346 if (unlikely(afinfo == NULL))
2347 return -EAFNOSUPPORT;
2348
d5422efe 2349 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2350 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
bdba9fe0 2351 rcu_read_unlock();
e0d1caa7 2352 return err;
1da177e4 2353}
d5422efe 2354EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2355
9a7386ec 2356static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2357{
2358 for (; k < sp->len; k++) {
df0ba92a 2359 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2360 *idxp = k;
1da177e4 2361 return 1;
df0ba92a 2362 }
1da177e4
LT		 2363 }
2364
2365 return 0;
2366}
2367
a716c119 2368int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2369 unsigned short family)
2370{
f6e1e25d 2371 struct net *net = dev_net(skb->dev);
1da177e4 2372 struct xfrm_policy *pol;
4e81bb83
MN		 2373 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2374 int npols = 0;
2375 int xfrm_nr;
2376 int pi;
d5422efe 2377 int reverse;
1da177e4 2378 struct flowi fl;
df0ba92a 2379 int xerr_idx = -1;
1da177e4 2380
d5422efe
HX		 2381 reverse = dir & ~XFRM_POLICY_MASK;
2382 dir &= XFRM_POLICY_MASK;
d5422efe 2383
0aa64774 2384 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2385 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2386 return 0;
0aa64774
MN		 2387 }
2388
eb9c7ebe 2389 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2390
2391 /* First, check used SA against their selectors. */
2392 if (skb->sp) {
2393 int i;
2394
9b7a787d 2395 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2396 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2397 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2398 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2399 return 0;
0aa64774 2400 }
1da177e4
LT		 2401 }
2402 }
2403
2404 pol = NULL;
bd5eb35f 2405 sk = sk_to_full_sk(sk);
3bccfbc7 2406 if (sk && sk->sk_policy[dir]) {
4c86d777 2407 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
0aa64774 2408 if (IS_ERR(pol)) {
59c9940e 2409 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2410 return 0;
0aa64774 2411 }
3bccfbc7 2412 }
1da177e4 2413
86dc8ee0
FW		 2414 if (!pol)
2415 pol = xfrm_policy_lookup(net, &fl, family, dir);
1da177e4 2416
0aa64774 2417 if (IS_ERR(pol)) {
59c9940e 2418 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2419 return 0;
0aa64774 2420 }
134b0fc5 2421
df0ba92a 2422 if (!pol) {
d1d9facf 2423 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2424 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2425 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2426 return 0;
2427 }
2428 return 1;
2429 }
1da177e4 2430
9d729f72 2431 pol->curlft.use_time = get_seconds();
1da177e4 2432
4e81bb83 2433 pols[0] = pol;
02d0892f 2434 npols++;
4e81bb83
MN		 2435#ifdef CONFIG_XFRM_SUB_POLICY
2436 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2437 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2438 &fl, family,
2439 XFRM_POLICY_IN);
2440 if (pols[1]) {
0aa64774 2441 if (IS_ERR(pols[1])) {
59c9940e 2442 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2443 return 0;
0aa64774 2444 }
9d729f72 2445 pols[1]->curlft.use_time = get_seconds();
02d0892f 2446 npols++;
4e81bb83
MN		 2447 }
2448 }
2449#endif
2450
1da177e4
LT		 2451 if (pol->action == XFRM_POLICY_ALLOW) {
2452 struct sec_path *sp;
2453 static struct sec_path dummy;
4e81bb83 2454 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2455 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2456 struct xfrm_tmpl **tpp = tp;
2457 int ti = 0;
1da177e4
LT		 2458 int i, k;
2459
2460 if ((sp = skb->sp) == NULL)
2461 sp = &dummy;
2462
4e81bb83
MN		 2463 for (pi = 0; pi < npols; pi++) {
2464 if (pols[pi] != pol &&
0aa64774 2465 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2466 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2467 goto reject;
0aa64774
MN		 2468 }
2469 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2470 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2471 goto reject_error;
0aa64774 2472 }
4e81bb83
MN		 2473 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2474 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2475 }
2476 xfrm_nr = ti;
41a49cc3 2477 if (npols > 1) {
283bc9f3 2478 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2479 tpp = stp;
2480 }
4e81bb83 2481
1da177e4
LT		 2482 /* For each tunnel xfrm, find the first matching tmpl.
2483 * For each tmpl before that, find corresponding xfrm.
2484 * Order is _important_. Later we will implement
2485 * some barriers, but at the moment barriers
2486 * are implied between each two transformations.
2487 */
4e81bb83
MN		 2488 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2489 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2490 if (k < 0) {
d1d9facf
JM		 2491 if (k < -1)
2492 /* "-2 - errored_index" returned */
2493 xerr_idx = -(2+k);
59c9940e 2494 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2495 goto reject;
df0ba92a 2496 }
1da177e4
LT		 2497 }
2498
0aa64774 2499 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2500 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2501 goto reject;
0aa64774 2502 }
1da177e4 2503
4e81bb83 2504 xfrm_pols_put(pols, npols);
1da177e4
LT		 2505 return 1;
2506 }
59c9940e 2507 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2508
2509reject:
df0ba92a 2510 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2511reject_error:
2512 xfrm_pols_put(pols, npols);
1da177e4
LT		 2513 return 0;
2514}
2515EXPORT_SYMBOL(__xfrm_policy_check);
2516
2517int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2518{
99a66657 2519 struct net *net = dev_net(skb->dev);
1da177e4 2520 struct flowi fl;
adf30907 2521 struct dst_entry *dst;
73137147 2522 int res = 1;
1da177e4 2523
0aa64774 2524 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2525 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2526 return 0;
0aa64774 2527 }
1da177e4 2528
fafeeb6c 2529 skb_dst_force(skb);
adf30907 2530
b8c203b2 2531 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 2532 if (IS_ERR(dst)) {
73137147 2533 res = 0;
452edd59
DM		 2534 dst = NULL;
2535 }
adf30907
ED		 2536 skb_dst_set(skb, dst);
2537 return res;
1da177e4
LT		 2538}
2539EXPORT_SYMBOL(__xfrm_route_forward);
2540
d49c73c7
DM		 2541/* Optimize later using cookies and generation ids. */
2542
1da177e4
LT		 2543static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2544{
d49c73c7 2545 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2546 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2547 * get validated by dst_ops->check on every use. We do this
2548 * because when a normal route referenced by an XFRM dst is
2549 * obsoleted we do not go looking around for all parent
2550 * referencing XFRM dsts so that we can invalidate them. It
2551 * is just too much work. Instead we make the checks here on
2552 * every use. For example:
d49c73c7
DM		 2553 *
2554 * XFRM dst A --> IPv4 dst X
2555 *
2556 * X is the "xdst->route" of A (X is also the "dst->path" of A
2557 * in this example). If X is marked obsolete, "A" will not
2558 * notice. That's what we are validating here via the
2559 * stale_bundle() check.
2560 *
52df157f
WW		 2561 * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will
2562 * be marked on it.
09c75704 2563 * This will force stale_bundle() to fail on any xdst bundle with
52df157f 2564 * this dst linked in it.
399c180a 2565 */
d49c73c7
DM		 2566 if (dst->obsolete < 0 && !stale_bundle(dst))
2567 return dst;
2568
1da177e4
LT		 2569 return NULL;
2570}
2571
2572static int stale_bundle(struct dst_entry *dst)
2573{
12fdb4d3 2574 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2575}
2576
aabc9761 2577void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2578{
1da177e4 2579 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2580 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2581 dev_hold(dst->dev);
1da177e4
LT		 2582 dev_put(dev);
2583 }
2584}
aabc9761 2585EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2586
2587static void xfrm_link_failure(struct sk_buff *skb)
2588{
2589 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2590}
2591
2592static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2593{
2594 if (dst) {
2595 if (dst->obsolete) {
2596 dst_release(dst);
2597 dst = NULL;
2598 }
2599 }
2600 return dst;
2601}
2602
25ee3286 2603static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2604{
2605 do {
2606 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2607 u32 pmtu, route_mtu_cached;
2608
2609 pmtu = dst_mtu(dst->child);
2610 xdst->child_mtu_cached = pmtu;
2611
2612 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2613
2614 route_mtu_cached = dst_mtu(xdst->route);
2615 xdst->route_mtu_cached = route_mtu_cached;
2616
2617 if (pmtu > route_mtu_cached)
2618 pmtu = route_mtu_cached;
2619
defb3519 2620 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2621 } while ((dst = dst->next));
2622}
2623
1da177e4
LT		 2624/* Check that the bundle accepts the flow and its components are
2625 * still valid.
2626 */
2627
12fdb4d3 2628static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2629{
2630 struct dst_entry *dst = &first->u.dst;
2631 struct xfrm_dst *last;
2632 u32 mtu;
2633
92d63dec 2634 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2635 (dst->dev && !netif_running(dst->dev)))
2636 return 0;
2637
a0073fe1
SK		 2638 if (dst->flags & DST_XFRM_QUEUE)
2639 return 1;
2640
1da177e4
LT		 2641 last = NULL;
2642
2643 do {
2644 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2645
1da177e4
LT		 2646 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2647 return 0;
80c802f3
TT		 2648 if (xdst->xfrm_genid != dst->xfrm->genid)
2649 return 0;
b1312c89
TT		 2650 if (xdst->num_pols > 0 &&
2651 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2652 return 0;
e53820de 2653
1da177e4
LT		 2654 mtu = dst_mtu(dst->child);
2655 if (xdst->child_mtu_cached != mtu) {
2656 last = xdst;
2657 xdst->child_mtu_cached = mtu;
2658 }
2659
92d63dec 2660 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2661 return 0;
2662 mtu = dst_mtu(xdst->route);
2663 if (xdst->route_mtu_cached != mtu) {
2664 last = xdst;
2665 xdst->route_mtu_cached = mtu;
2666 }
2667
2668 dst = dst->child;
2669 } while (dst->xfrm);
2670
2671 if (likely(!last))
2672 return 1;
2673
2674 mtu = last->child_mtu_cached;
2675 for (;;) {
2676 dst = &last->u.dst;
2677
2678 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2679 if (mtu > last->route_mtu_cached)
2680 mtu = last->route_mtu_cached;
defb3519 2681 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2682
2683 if (last == first)
2684 break;
2685
bd0bf076 2686 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2687 last->child_mtu_cached = mtu;
2688 }
2689
2690 return 1;
2691}
2692
0dbaee3b
DM		 2693static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2694{
2695 return dst_metric_advmss(dst->path);
2696}
2697
ebb762f2 2698static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2699{
618f9bc7
SK		 2700 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2701
2702 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2703}
2704
1ecc9ad0
JA		 2705static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2706 const void *daddr)
63fca65d
JA		 2707{
2708 const struct dst_entry *path = dst->path;
2709
2710 for (; dst != path; dst = dst->child) {
2711 const struct xfrm_state *xfrm = dst->xfrm;
2712
2713 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2714 continue;
2715 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2716 daddr = xfrm->coaddr;
2717 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2718 daddr = &xfrm->id.daddr;
2719 }
1ecc9ad0
JA		 2720 return daddr;
2721}
2722
2723static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2724 struct sk_buff *skb,
2725 const void *daddr)
2726{
2727 const struct dst_entry *path = dst->path;
2728
2729 if (!skb)
2730 daddr = xfrm_get_dst_nexthop(dst, daddr);
2731 return path->ops->neigh_lookup(path, skb, daddr);
2732}
2733
2734static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2735{
2736 const struct dst_entry *path = dst->path;
2737
2738 daddr = xfrm_get_dst_nexthop(dst, daddr);
63fca65d
JA		 2739 path->ops->confirm_neigh(path, daddr);
2740}
2741
a2817d8b 2742int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
1da177e4
LT		 2743{
2744 int err = 0;
a2817d8b
FW		 2745
2746 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
1da177e4 2747 return -EAFNOSUPPORT;
a2817d8b 2748
ef8531b6 2749 spin_lock(&xfrm_policy_afinfo_lock);
a2817d8b 2750 if (unlikely(xfrm_policy_afinfo[family] != NULL))
f31e8d4f 2751 err = -EEXIST;
1da177e4
LT		 2752 else {
2753 struct dst_ops *dst_ops = afinfo->dst_ops;
2754 if (likely(dst_ops->kmem_cachep == NULL))
2755 dst_ops->kmem_cachep = xfrm_dst_cache;
2756 if (likely(dst_ops->check == NULL))
2757 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2758 if (likely(dst_ops->default_advmss == NULL))
2759 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2760 if (likely(dst_ops->mtu == NULL))
2761 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2762 if (likely(dst_ops->negative_advice == NULL))
2763 dst_ops->negative_advice = xfrm_negative_advice;
2764 if (likely(dst_ops->link_failure == NULL))
2765 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2766 if (likely(dst_ops->neigh_lookup == NULL))
2767 dst_ops->neigh_lookup = xfrm_neigh_lookup;
63fca65d
JA		 2768 if (likely(!dst_ops->confirm_neigh))
2769 dst_ops->confirm_neigh = xfrm_confirm_neigh;
a2817d8b 2770 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
1da177e4 2771 }
ef8531b6 2772 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 2773
1da177e4
LT		 2774 return err;
2775}
2776EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2777
a2817d8b 2778void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
1da177e4 2779{
2b61997a 2780 struct dst_ops *dst_ops = afinfo->dst_ops;
a2817d8b 2781 int i;
2b61997a 2782
a2817d8b
FW		 2783 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2784 if (xfrm_policy_afinfo[i] != afinfo)
2785 continue;
2786 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2787 break;
ef8531b6 2788 }
ef8531b6 2789
2b61997a 2790 synchronize_rcu();
ef8531b6 2791
2b61997a
FW		 2792 dst_ops->kmem_cachep = NULL;
2793 dst_ops->check = NULL;
2794 dst_ops->negative_advice = NULL;
2795 dst_ops->link_failure = NULL;
1da177e4
LT		 2796}
2797EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2798
558f82ef 2799#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2800static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2801{
c68cd1a0 2802 int rv;
698365fa
WC		 2803 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2804 if (!net->mib.xfrm_statistics)
558f82ef 2805 return -ENOMEM;
c68cd1a0
AD		 2806 rv = xfrm_proc_init(net);
2807 if (rv < 0)
698365fa 2808 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 2809 return rv;
558f82ef 2810}
59c9940e
AD		 2811
2812static void xfrm_statistics_fini(struct net *net)
2813{
c68cd1a0 2814 xfrm_proc_fini(net);
698365fa 2815 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 2816}
2817#else
2818static int __net_init xfrm_statistics_init(struct net *net)
2819{
2820 return 0;
2821}
2822
2823static void xfrm_statistics_fini(struct net *net)
2824{
2825}
558f82ef
MN		 2826#endif
2827
d62ddc21 2828static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2829{
2518c7c2
DM		 2830 unsigned int hmask, sz;
2831 int dir;
2832
d62ddc21
AD		 2833 if (net_eq(net, &init_net))
2834 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2835 sizeof(struct xfrm_dst),
e5d679f3 2836 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2837 NULL);
1da177e4 2838
2518c7c2
DM		 2839 hmask = 8 - 1;
2840 sz = (hmask+1) * sizeof(struct hlist_head);
2841
93b851c1
AD		 2842 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2843 if (!net->xfrm.policy_byidx)
2844 goto out_byidx;
8100bea7 2845 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 2846
53c2e285 2847 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 2848 struct xfrm_policy_hash *htab;
2849
dc2caba7 2850 net->xfrm.policy_count[dir] = 0;
53c2e285 2851 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 2852 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 2853
a35f6c5d 2854 htab = &net->xfrm.policy_bydst[dir];
44e36b42 2855 htab->table = xfrm_hash_alloc(sz);
2518c7c2 2856 if (!htab->table)
a35f6c5d
AD		 2857 goto out_bydst;
2858 htab->hmask = hmask;
b58555f1
CG		 2859 htab->dbits4 = 32;
2860 htab->sbits4 = 32;
2861 htab->dbits6 = 128;
2862 htab->sbits6 = 128;
2518c7c2 2863 }
880a6fab
CG		 2864 net->xfrm.policy_hthresh.lbits4 = 32;
2865 net->xfrm.policy_hthresh.rbits4 = 32;
2866 net->xfrm.policy_hthresh.lbits6 = 128;
2867 net->xfrm.policy_hthresh.rbits6 = 128;
2868
2869 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 2870
adfcf0b2 2871 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 2872 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 2873 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21 2874 if (net_eq(net, &init_net))
21f42cc9 2875 xfrm_dev_init();
d62ddc21 2876 return 0;
93b851c1 2877
a35f6c5d
AD		 2878out_bydst:
2879 for (dir--; dir >= 0; dir--) {
2880 struct xfrm_policy_hash *htab;
2881
2882 htab = &net->xfrm.policy_bydst[dir];
2883 xfrm_hash_free(htab->table, sz);
2884 }
2885 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 2886out_byidx:
2887 return -ENOMEM;
d62ddc21
AD		 2888}
2889
2890static void xfrm_policy_fini(struct net *net)
2891{
93b851c1 2892 unsigned int sz;
8b18f8ea 2893 int dir;
93b851c1 2894
7c2776ee
AD		 2895 flush_work(&net->xfrm.policy_hash_work);
2896#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 2897 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 2898#endif
2e71029e 2899 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 2900
adfcf0b2 2901 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 2902
53c2e285 2903 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 2904 struct xfrm_policy_hash *htab;
2905
8b18f8ea 2906 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 2907
2908 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 2909 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 2910 WARN_ON(!hlist_empty(htab->table));
2911 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 2912 }
2913
8100bea7 2914 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 2915 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2916 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 2917}
2918
d62ddc21
AD		 2919static int __net_init xfrm_net_init(struct net *net)
2920{
2921 int rv;
2922
c282222a
FW		 2923 /* Initialize the per-net locks here */
2924 spin_lock_init(&net->xfrm.xfrm_state_lock);
2925 spin_lock_init(&net->xfrm.xfrm_policy_lock);
2926 mutex_init(&net->xfrm.xfrm_cfg_mutex);
2927
59c9940e
AD		 2928 rv = xfrm_statistics_init(net);
2929 if (rv < 0)
2930 goto out_statistics;
d62ddc21
AD		 2931 rv = xfrm_state_init(net);
2932 if (rv < 0)
2933 goto out_state;
2934 rv = xfrm_policy_init(net);
2935 if (rv < 0)
2936 goto out_policy;
b27aeadb
AD		 2937 rv = xfrm_sysctl_init(net);
2938 if (rv < 0)
2939 goto out_sysctl;
283bc9f3 2940
d62ddc21
AD		 2941 return 0;
2942
b27aeadb
AD		 2943out_sysctl:
2944 xfrm_policy_fini(net);
d62ddc21
AD		 2945out_policy:
2946 xfrm_state_fini(net);
2947out_state:
59c9940e
AD		 2948 xfrm_statistics_fini(net);
2949out_statistics:
d62ddc21
AD		 2950 return rv;
2951}
2952
2953static void __net_exit xfrm_net_exit(struct net *net)
2954{
b27aeadb 2955 xfrm_sysctl_fini(net);
d62ddc21
AD		 2956 xfrm_policy_fini(net);
2957 xfrm_state_fini(net);
59c9940e 2958 xfrm_statistics_fini(net);
d62ddc21
AD		 2959}
2960
2961static struct pernet_operations __net_initdata xfrm_net_ops = {
2962 .init = xfrm_net_init,
2963 .exit = xfrm_net_exit,
2964};
2965
1da177e4
LT		 2966void __init xfrm_init(void)
2967{
ec30d78c
FW		 2968 int i;
2969
2970 xfrm_pcpu_work = kmalloc_array(NR_CPUS, sizeof(*xfrm_pcpu_work),
2971 GFP_KERNEL);
2972 BUG_ON(!xfrm_pcpu_work);
2973
2974 for (i = 0; i < NR_CPUS; i++)
2975 INIT_WORK(&xfrm_pcpu_work[i], xfrm_pcpu_work_fn);
2976
d62ddc21 2977 register_pernet_subsys(&xfrm_net_ops);
30846090 2978 seqcount_init(&xfrm_policy_hash_generation);
1da177e4
LT		 2979 xfrm_input_init();
2980}
2981
ab5f5e8b 2982#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 2983static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2984 struct audit_buffer *audit_buf)
ab5f5e8b 2985{
875179fa
PM		 2986 struct xfrm_sec_ctx *ctx = xp->security;
2987 struct xfrm_selector *sel = &xp->selector;
2988
2989 if (ctx)
ab5f5e8b 2990 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 2991 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2992
9b7a787d 2993 switch (sel->family) {
ab5f5e8b 2994 case AF_INET:
21454aaa 2995 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 2996 if (sel->prefixlen_s != 32)
2997 audit_log_format(audit_buf, " src_prefixlen=%d",
2998 sel->prefixlen_s);
21454aaa 2999 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 3000 if (sel->prefixlen_d != 32)
3001 audit_log_format(audit_buf, " dst_prefixlen=%d",
3002 sel->prefixlen_d);
ab5f5e8b
JL		 3003 break;
3004 case AF_INET6:
5b095d98 3005 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3006 if (sel->prefixlen_s != 128)
3007 audit_log_format(audit_buf, " src_prefixlen=%d",
3008 sel->prefixlen_s);
5b095d98 3009 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3010 if (sel->prefixlen_d != 128)
3011 audit_log_format(audit_buf, " dst_prefixlen=%d",
3012 sel->prefixlen_d);
ab5f5e8b
JL		 3013 break;
3014 }
3015}
3016
2e71029e 3017void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 3018{
3019 struct audit_buffer *audit_buf;
ab5f5e8b 3020
afeb14b4 3021 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3022 if (audit_buf == NULL)
3023 return;
2e71029e 3024 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3025 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3026 xfrm_audit_common_policyinfo(xp, audit_buf);
3027 audit_log_end(audit_buf);
3028}
3029EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3030
68277acc 3031void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 3032 bool task_valid)
ab5f5e8b
JL		 3033{
3034 struct audit_buffer *audit_buf;
ab5f5e8b 3035
afeb14b4 3036 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3037 if (audit_buf == NULL)
3038 return;
2e71029e 3039 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3040 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3041 xfrm_audit_common_policyinfo(xp, audit_buf);
3042 audit_log_end(audit_buf);
3043}
3044EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3045#endif
3046
80c9abaa 3047#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3048static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3049 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3050{
3051 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3052 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3053 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3054 sel_cmp->family) &&
3055 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3056 sel_cmp->family) &&
80c9abaa
SS		 3057 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3058 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3059 return true;
80c9abaa
SS		 3060 }
3061 } else {
3062 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3063 return true;
80c9abaa
SS		 3064 }
3065 }
bc9b35ad 3066 return false;
80c9abaa
SS		 3067}
3068
3e94c2dc
WC		 3069static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3070 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3071{
3072 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3073 struct hlist_head *chain;
3074 u32 priority = ~0U;
3075
9d0380df 3076 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 3077 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3078 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3079 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3080 pol->type == type) {
3081 ret = pol;
3082 priority = ret->priority;
3083 break;
3084 }
3085 }
8d549c4f 3086 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3087 hlist_for_each_entry(pol, chain, bydst) {
8faf491e
LR		 3088 if ((pol->priority >= priority) && ret)
3089 break;
3090
80c9abaa 3091 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 3092 pol->type == type) {
80c9abaa
SS		 3093 ret = pol;
3094 break;
3095 }
3096 }
3097
586f2eb4 3098 xfrm_pol_hold(ret);
80c9abaa 3099
9d0380df 3100 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3101
3102 return ret;
3103}
3104
dd701754 3105static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3106{
3107 int match = 0;
3108
3109 if (t->mode == m->mode && t->id.proto == m->proto &&
3110 (m->reqid == 0 || t->reqid == m->reqid)) {
3111 switch (t->mode) {
3112 case XFRM_MODE_TUNNEL:
3113 case XFRM_MODE_BEET:
70e94e66
YH		 3114 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3115 m->old_family) &&
3116 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3117 m->old_family)) {
80c9abaa
SS		 3118 match = 1;
3119 }
3120 break;
3121 case XFRM_MODE_TRANSPORT:
3122 /* in case of transport mode, template does not store
3123 any IP addresses, hence we just compare mode and
3124 protocol */
3125 match = 1;
3126 break;
3127 default:
3128 break;
3129 }
3130 }
3131 return match;
3132}
3133
3134/* update endpoint address(es) of template(s) */
3135static int xfrm_policy_migrate(struct xfrm_policy *pol,
3136 struct xfrm_migrate *m, int num_migrate)
3137{
3138 struct xfrm_migrate *mp;
80c9abaa
SS		 3139 int i, j, n = 0;
3140
3141 write_lock_bh(&pol->lock);
12a169e7 3142 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3143 /* target policy has been deleted */
3144 write_unlock_bh(&pol->lock);
3145 return -ENOENT;
3146 }
3147
3148 for (i = 0; i < pol->xfrm_nr; i++) {
3149 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3150 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3151 continue;
3152 n++;
1bfcb10f
HX		 3153 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3154 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3155 continue;
3156 /* update endpoints */
3157 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3158 sizeof(pol->xfrm_vec[i].id.daddr));
3159 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3160 sizeof(pol->xfrm_vec[i].saddr));
3161 pol->xfrm_vec[i].encap_family = mp->new_family;
3162 /* flush bundles */
80c802f3 3163 atomic_inc(&pol->genid);
80c9abaa
SS		 3164 }
3165 }
3166
3167 write_unlock_bh(&pol->lock);
3168
3169 if (!n)
3170 return -ENODATA;
3171
3172 return 0;
3173}
3174
dd701754 3175static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3176{
3177 int i, j;
3178
3179 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3180 return -EINVAL;
3181
3182 for (i = 0; i < num_migrate; i++) {
80c9abaa
SS		 3183 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3184 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3185 return -EINVAL;
3186
3187 /* check if there is any duplicated entry */
3188 for (j = i + 1; j < num_migrate; j++) {
3189 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3190 sizeof(m[i].old_daddr)) &&
3191 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3192 sizeof(m[i].old_saddr)) &&
3193 m[i].proto == m[j].proto &&
3194 m[i].mode == m[j].mode &&
3195 m[i].reqid == m[j].reqid &&
3196 m[i].old_family == m[j].old_family)
3197 return -EINVAL;
3198 }
3199 }
3200
3201 return 0;
3202}
3203
b4b7c0b3 3204int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3205 struct xfrm_migrate *m, int num_migrate,
4ab47d47
AA		 3206 struct xfrm_kmaddress *k, struct net *net,
3207 struct xfrm_encap_tmpl *encap)
80c9abaa
SS		 3208{
3209 int i, err, nx_cur = 0, nx_new = 0;
3210 struct xfrm_policy *pol = NULL;
3211 struct xfrm_state *x, *xc;
3212 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3213 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3214 struct xfrm_migrate *mp;
3215
7bab0963 3216 /* Stage 0 - sanity checks */
80c9abaa
SS		 3217 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3218 goto out;
3219
7bab0963
VD		 3220 if (dir >= XFRM_POLICY_MAX) {
3221 err = -EINVAL;
3222 goto out;
3223 }
3224
80c9abaa 3225 /* Stage 1 - find policy */
8d549c4f 3226 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3227 err = -ENOENT;
3228 goto out;
3229 }
3230
3231 /* Stage 2 - find and update state(s) */
3232 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3233 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3234 x_cur[nx_cur] = x;
3235 nx_cur++;
4ab47d47
AA		 3236 xc = xfrm_state_migrate(x, mp, encap);
3237 if (xc) {
80c9abaa
SS		 3238 x_new[nx_new] = xc;
3239 nx_new++;
3240 } else {
3241 err = -ENODATA;
3242 goto restore_state;
3243 }
3244 }
3245 }
3246
3247 /* Stage 3 - update policy */
3248 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3249 goto restore_state;
3250
3251 /* Stage 4 - delete old state(s) */
3252 if (nx_cur) {
3253 xfrm_states_put(x_cur, nx_cur);
3254 xfrm_states_delete(x_cur, nx_cur);
3255 }
3256
3257 /* Stage 5 - announce */
8bafd730 3258 km_migrate(sel, dir, type, m, num_migrate, k, encap);
80c9abaa
SS		 3259
3260 xfrm_pol_put(pol);
3261
3262 return 0;
3263out:
3264 return err;
3265
3266restore_state:
3267 if (pol)
3268 xfrm_pol_put(pol);
3269 if (nx_cur)
3270 xfrm_states_put(x_cur, nx_cur);
3271 if (nx_new)
3272 xfrm_states_delete(x_new, nx_new);
3273
3274 return err;
3275}
e610e679 3276EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3277#endif
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