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net: add confirm_neigh method to dst_ops
[mirror_ubuntu-zesty-kernel.git] / net / xfrm / xfrm_policy.c
CommitLineData
a716c119 1/*
1da177e4
LT		 2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
df71837d 13 *
1da177e4
LT		 14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT		 17#include <linux/slab.h>
18#include <linux/kmod.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/workqueue.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
6ce74ec7 29#include <net/flow.h>
1da177e4
LT		 30#include <net/xfrm.h>
31#include <net/ip.h>
558f82ef
MN		 32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
1da177e4 35
44e36b42
DM		 36#include "xfrm_hash.h"
37
a0073fe1
SK		 38#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
b8c203b2
SK		 42struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45};
46
418a99ac
PJ		 47static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
48static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
49 __read_mostly;
1da177e4 50
e18b890b 51static struct kmem_cache *xfrm_dst_cache __read_mostly;
30846090 52static __read_mostly seqcount_t xfrm_policy_hash_generation;
1da177e4 53
25ee3286 54static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 55static int stale_bundle(struct dst_entry *dst);
12fdb4d3 56static int xfrm_bundle_ok(struct xfrm_dst *xdst);
a0073fe1 57static void xfrm_policy_queue_process(unsigned long arg);
1da177e4 58
12bfa8bd 59static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
29fa0b30
WY		 60static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 int dir);
62
e37cc8ad
FW		 63static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
64{
65 return atomic_inc_not_zero(&policy->refcnt);
66}
67
bc9b35ad 68static inline bool
200ce96e 69__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 70{
7e1dc7b6
DM		 71 const struct flowi4 *fl4 = &fl->u.ip4;
72
26bff940
AD		 73 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
74 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 75 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
77 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
78 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 79}
80
bc9b35ad 81static inline bool
200ce96e 82__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 83{
7e1dc7b6
DM		 84 const struct flowi6 *fl6 = &fl->u.ip6;
85
86 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
87 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
88 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
89 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
90 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
91 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 92}
93
bc9b35ad
DM		 94bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
95 unsigned short family)
77681021
AM		 96{
97 switch (family) {
98 case AF_INET:
99 return __xfrm4_selector_match(sel, fl);
100 case AF_INET6:
101 return __xfrm6_selector_match(sel, fl);
102 }
bc9b35ad 103 return false;
77681021
AM		 104}
105
ef8531b6
ED		 106static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
107{
108 struct xfrm_policy_afinfo *afinfo;
109
110 if (unlikely(family >= NPROTO))
111 return NULL;
112 rcu_read_lock();
113 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
114 if (unlikely(!afinfo))
115 rcu_read_unlock();
116 return afinfo;
117}
118
119static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
120{
121 rcu_read_unlock();
122}
123
42a7b32b
DA		 124static inline struct dst_entry *__xfrm_dst_lookup(struct net *net,
125 int tos, int oif,
6418c4e0
DM		 126 const xfrm_address_t *saddr,
127 const xfrm_address_t *daddr,
9bb182a7
YH		 128 int family)
129{
130 struct xfrm_policy_afinfo *afinfo;
131 struct dst_entry *dst;
132
133 afinfo = xfrm_policy_get_afinfo(family);
134 if (unlikely(afinfo == NULL))
135 return ERR_PTR(-EAFNOSUPPORT);
136
42a7b32b 137 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
9bb182a7
YH		 138
139 xfrm_policy_put_afinfo(afinfo);
140
141 return dst;
142}
143
42a7b32b
DA		 144static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
145 int tos, int oif,
9bb182a7
YH		 146 xfrm_address_t *prev_saddr,
147 xfrm_address_t *prev_daddr,
25ee3286 148 int family)
1da177e4 149{
c5b3cf46 150 struct net *net = xs_net(x);
66cdb3ca
HX		 151 xfrm_address_t *saddr = &x->props.saddr;
152 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 153 struct dst_entry *dst;
154
9bb182a7 155 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 156 saddr = x->coaddr;
9bb182a7
YH		 157 daddr = prev_daddr;
158 }
159 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
160 saddr = prev_saddr;
66cdb3ca 161 daddr = x->coaddr;
9bb182a7 162 }
1da177e4 163
42a7b32b 164 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
9bb182a7
YH		 165
166 if (!IS_ERR(dst)) {
167 if (prev_saddr != saddr)
168 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
169 if (prev_daddr != daddr)
170 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
171 }
1da177e4 172
66cdb3ca 173 return dst;
1da177e4 174}
1da177e4 175
1da177e4
LT		 176static inline unsigned long make_jiffies(long secs)
177{
178 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
179 return MAX_SCHEDULE_TIMEOUT-1;
180 else
a716c119 181 return secs*HZ;
1da177e4
LT		 182}
183
184static void xfrm_policy_timer(unsigned long data)
185{
3e94c2dc 186 struct xfrm_policy *xp = (struct xfrm_policy *)data;
9d729f72 187 unsigned long now = get_seconds();
1da177e4
LT		 188 long next = LONG_MAX;
189 int warn = 0;
190 int dir;
191
192 read_lock(&xp->lock);
193
ea2dea9d 194 if (unlikely(xp->walk.dead))
1da177e4
LT		 195 goto out;
196
77d8d7a6 197 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 198
199 if (xp->lft.hard_add_expires_seconds) {
200 long tmo = xp->lft.hard_add_expires_seconds +
201 xp->curlft.add_time - now;
202 if (tmo <= 0)
203 goto expired;
204 if (tmo < next)
205 next = tmo;
206 }
207 if (xp->lft.hard_use_expires_seconds) {
208 long tmo = xp->lft.hard_use_expires_seconds +
209 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
210 if (tmo <= 0)
211 goto expired;
212 if (tmo < next)
213 next = tmo;
214 }
215 if (xp->lft.soft_add_expires_seconds) {
216 long tmo = xp->lft.soft_add_expires_seconds +
217 xp->curlft.add_time - now;
218 if (tmo <= 0) {
219 warn = 1;
220 tmo = XFRM_KM_TIMEOUT;
221 }
222 if (tmo < next)
223 next = tmo;
224 }
225 if (xp->lft.soft_use_expires_seconds) {
226 long tmo = xp->lft.soft_use_expires_seconds +
227 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
228 if (tmo <= 0) {
229 warn = 1;
230 tmo = XFRM_KM_TIMEOUT;
231 }
232 if (tmo < next)
233 next = tmo;
234 }
235
236 if (warn)
6c5c8ca7 237 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT		 238 if (next != LONG_MAX &&
239 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
240 xfrm_pol_hold(xp);
241
242out:
243 read_unlock(&xp->lock);
244 xfrm_pol_put(xp);
245 return;
246
247expired:
248 read_unlock(&xp->lock);
4666faab 249 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 250 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 251 xfrm_pol_put(xp);
252}
253
fe1a5f03
TT		 254static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
255{
256 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
257
258 if (unlikely(pol->walk.dead))
259 flo = NULL;
260 else
261 xfrm_pol_hold(pol);
262
263 return flo;
264}
265
266static int xfrm_policy_flo_check(struct flow_cache_object *flo)
267{
268 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
269
270 return !pol->walk.dead;
271}
272
273static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
274{
275 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
276}
277
278static const struct flow_cache_ops xfrm_policy_fc_ops = {
279 .get = xfrm_policy_flo_get,
280 .check = xfrm_policy_flo_check,
281 .delete = xfrm_policy_flo_delete,
282};
1da177e4
LT		 283
284/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
285 * SPD calls.
286 */
287
0331b1f3 288struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 289{
290 struct xfrm_policy *policy;
291
0da974f4 292 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 293
294 if (policy) {
0331b1f3 295 write_pnet(&policy->xp_net, net);
12a169e7 296 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM		 297 INIT_HLIST_NODE(&policy->bydst);
298 INIT_HLIST_NODE(&policy->byidx);
1da177e4 299 rwlock_init(&policy->lock);
2518c7c2 300 atomic_set(&policy->refcnt, 1);
a0073fe1 301 skb_queue_head_init(&policy->polq.hold_queue);
b24b8a24
PE		 302 setup_timer(&policy->timer, xfrm_policy_timer,
303 (unsigned long)policy);
a0073fe1
SK		 304 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
305 (unsigned long)policy);
fe1a5f03 306 policy->flo.ops = &xfrm_policy_fc_ops;
1da177e4
LT		 307 }
308 return policy;
309}
310EXPORT_SYMBOL(xfrm_policy_alloc);
311
56f04730
ED		 312static void xfrm_policy_destroy_rcu(struct rcu_head *head)
313{
314 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
315
316 security_xfrm_policy_free(policy->security);
317 kfree(policy);
318}
319
1da177e4
LT		 320/* Destroy xfrm_policy: descendant resources must be released to this moment. */
321
64c31b3f 322void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 323{
12a169e7 324 BUG_ON(!policy->walk.dead);
1da177e4 325
0659eea9 326 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 327 BUG();
328
56f04730 329 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
1da177e4 330}
64c31b3f 331EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 332
1da177e4
LT		 333/* Rule must be locked. Release descentant resources, announce
334 * entry dead. The rule must be unlinked from lists to the moment.
335 */
336
337static void xfrm_policy_kill(struct xfrm_policy *policy)
338{
12a169e7 339 policy->walk.dead = 1;
1da177e4 340
285ead17 341 atomic_inc(&policy->genid);
1da177e4 342
e7d8f6cb
SK		 343 if (del_timer(&policy->polq.hold_timer))
344 xfrm_pol_put(policy);
1ee5e667 345 skb_queue_purge(&policy->polq.hold_queue);
a0073fe1 346
285ead17
TT		 347 if (del_timer(&policy->timer))
348 xfrm_pol_put(policy);
349
350 xfrm_pol_put(policy);
1da177e4
LT		 351}
352
2518c7c2
DM		 353static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
354
e92303f8 355static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 356{
e92303f8 357 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 358}
359
b58555f1
CG		 360/* calculate policy hash thresholds */
361static void __get_hash_thresh(struct net *net,
362 unsigned short family, int dir,
363 u8 *dbits, u8 *sbits)
364{
365 switch (family) {
366 case AF_INET:
367 *dbits = net->xfrm.policy_bydst[dir].dbits4;
368 *sbits = net->xfrm.policy_bydst[dir].sbits4;
369 break;
370
371 case AF_INET6:
372 *dbits = net->xfrm.policy_bydst[dir].dbits6;
373 *sbits = net->xfrm.policy_bydst[dir].sbits6;
374 break;
375
376 default:
377 *dbits = 0;
378 *sbits = 0;
379 }
380}
381
5f803b58
DM		 382static struct hlist_head *policy_hash_bysel(struct net *net,
383 const struct xfrm_selector *sel,
384 unsigned short family, int dir)
2518c7c2 385{
1121994c 386 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 387 unsigned int hash;
388 u8 dbits;
389 u8 sbits;
390
391 __get_hash_thresh(net, family, dir, &dbits, &sbits);
392 hash = __sel_hash(sel, family, hmask, dbits, sbits);
2518c7c2 393
e1e551bc
FW		 394 if (hash == hmask + 1)
395 return &net->xfrm.policy_inexact[dir];
396
397 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
398 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 399}
400
5f803b58
DM		 401static struct hlist_head *policy_hash_direct(struct net *net,
402 const xfrm_address_t *daddr,
403 const xfrm_address_t *saddr,
404 unsigned short family, int dir)
2518c7c2 405{
1121994c 406 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 407 unsigned int hash;
408 u8 dbits;
409 u8 sbits;
410
411 __get_hash_thresh(net, family, dir, &dbits, &sbits);
412 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
2518c7c2 413
e1e551bc
FW		 414 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
415 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 416}
417
b58555f1
CG		 418static void xfrm_dst_hash_transfer(struct net *net,
419 struct hlist_head *list,
2518c7c2 420 struct hlist_head *ndsttable,
b58555f1
CG		 421 unsigned int nhashmask,
422 int dir)
2518c7c2 423{
b67bfe0d 424 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 425 struct xfrm_policy *pol;
b791160b 426 unsigned int h0 = 0;
b58555f1
CG		 427 u8 dbits;
428 u8 sbits;
2518c7c2 429
b791160b 430redo:
b67bfe0d 431 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 432 unsigned int h;
433
b58555f1 434 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
2518c7c2 435 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
b58555f1 436 pol->family, nhashmask, dbits, sbits);
b791160b 437 if (!entry0) {
a5eefc1d
FW		 438 hlist_del_rcu(&pol->bydst);
439 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
b791160b
YH		 440 h0 = h;
441 } else {
442 if (h != h0)
443 continue;
a5eefc1d
FW		 444 hlist_del_rcu(&pol->bydst);
445 hlist_add_behind_rcu(&pol->bydst, entry0);
b791160b 446 }
b67bfe0d 447 entry0 = &pol->bydst;
b791160b
YH		 448 }
449 if (!hlist_empty(list)) {
450 entry0 = NULL;
451 goto redo;
2518c7c2
DM		 452 }
453}
454
455static void xfrm_idx_hash_transfer(struct hlist_head *list,
456 struct hlist_head *nidxtable,
457 unsigned int nhashmask)
458{
b67bfe0d 459 struct hlist_node *tmp;
2518c7c2
DM		 460 struct xfrm_policy *pol;
461
b67bfe0d 462 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 463 unsigned int h;
464
465 h = __idx_hash(pol->index, nhashmask);
466 hlist_add_head(&pol->byidx, nidxtable+h);
467 }
468}
469
470static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
471{
472 return ((old_hmask + 1) << 1) - 1;
473}
474
66caf628 475static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 476{
66caf628 477 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 478 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
479 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
44e36b42 480 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
e1e551bc 481 struct hlist_head *odst;
2518c7c2
DM		 482 int i;
483
484 if (!ndst)
485 return;
486
9d0380df 487 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
30846090
FW		 488 write_seqcount_begin(&xfrm_policy_hash_generation);
489
490 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
491 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
2518c7c2 492
e1e551bc
FW		 493 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
494 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
495
2518c7c2 496 for (i = hmask; i >= 0; i--)
b58555f1 497 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
2518c7c2 498
e1e551bc 499 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
66caf628 500 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 501
30846090 502 write_seqcount_end(&xfrm_policy_hash_generation);
9d0380df 503 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 504
e1e551bc
FW		 505 synchronize_rcu();
506
44e36b42 507 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 508}
509
66caf628 510static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 511{
66caf628 512 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 513 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
514 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 515 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 516 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 517 int i;
518
519 if (!nidx)
520 return;
521
9d0380df 522 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 523
524 for (i = hmask; i >= 0; i--)
525 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
526
66caf628
AD		 527 net->xfrm.policy_byidx = nidx;
528 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 529
9d0380df 530 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 531
44e36b42 532 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 533}
534
66caf628 535static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 536{
66caf628
AD		 537 unsigned int cnt = net->xfrm.policy_count[dir];
538 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 539
540 if (total)
541 *total += cnt;
542
543 if ((hmask + 1) < xfrm_policy_hashmax &&
544 cnt > hmask)
545 return 1;
546
547 return 0;
548}
549
66caf628 550static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 551{
66caf628 552 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 553
554 if ((hmask + 1) < xfrm_policy_hashmax &&
555 total > hmask)
556 return 1;
557
558 return 0;
559}
560
e071041b 561void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 562{
e071041b
AD		 563 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
564 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
565 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
566 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
567 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
568 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
569 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 570 si->spdhmcnt = xfrm_policy_hashmax;
ecfd6b18
JHS		 571}
572EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 573
ecfd6b18 574static DEFINE_MUTEX(hash_resize_mutex);
66caf628 575static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 576{
66caf628 577 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 578 int dir, total;
579
580 mutex_lock(&hash_resize_mutex);
581
582 total = 0;
53c2e285 583 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
66caf628
AD		 584 if (xfrm_bydst_should_resize(net, dir, &total))
585 xfrm_bydst_resize(net, dir);
2518c7c2 586 }
66caf628
AD		 587 if (xfrm_byidx_should_resize(net, total))
588 xfrm_byidx_resize(net, total);
2518c7c2
DM		 589
590 mutex_unlock(&hash_resize_mutex);
591}
592
880a6fab
CG		 593static void xfrm_hash_rebuild(struct work_struct *work)
594{
595 struct net *net = container_of(work, struct net,
596 xfrm.policy_hthresh.work);
597 unsigned int hmask;
598 struct xfrm_policy *pol;
599 struct xfrm_policy *policy;
600 struct hlist_head *chain;
601 struct hlist_head *odst;
602 struct hlist_node *newpos;
603 int i;
604 int dir;
605 unsigned seq;
606 u8 lbits4, rbits4, lbits6, rbits6;
607
608 mutex_lock(&hash_resize_mutex);
609
610 /* read selector prefixlen thresholds */
611 do {
612 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
613
614 lbits4 = net->xfrm.policy_hthresh.lbits4;
615 rbits4 = net->xfrm.policy_hthresh.rbits4;
616 lbits6 = net->xfrm.policy_hthresh.lbits6;
617 rbits6 = net->xfrm.policy_hthresh.rbits6;
618 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
619
9d0380df 620 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 621
622 /* reset the bydst and inexact table in all directions */
53c2e285 623 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
880a6fab
CG		 624 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
625 hmask = net->xfrm.policy_bydst[dir].hmask;
626 odst = net->xfrm.policy_bydst[dir].table;
627 for (i = hmask; i >= 0; i--)
628 INIT_HLIST_HEAD(odst + i);
629 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
630 /* dir out => dst = remote, src = local */
631 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
632 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
633 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
634 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
635 } else {
636 /* dir in/fwd => dst = local, src = remote */
637 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
638 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
639 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
640 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
641 }
642 }
643
644 /* re-insert all policies by order of creation */
645 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
6916fb3b
TB		 646 if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
647 /* skip socket policies */
648 continue;
649 }
880a6fab
CG		 650 newpos = NULL;
651 chain = policy_hash_bysel(net, &policy->selector,
652 policy->family,
653 xfrm_policy_id2dir(policy->index));
654 hlist_for_each_entry(pol, chain, bydst) {
655 if (policy->priority >= pol->priority)
656 newpos = &pol->bydst;
657 else
658 break;
659 }
660 if (newpos)
661 hlist_add_behind(&policy->bydst, newpos);
662 else
663 hlist_add_head(&policy->bydst, chain);
664 }
665
9d0380df 666 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 667
668 mutex_unlock(&hash_resize_mutex);
669}
670
671void xfrm_policy_hash_rebuild(struct net *net)
672{
673 schedule_work(&net->xfrm.policy_hthresh.work);
674}
675EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
676
1da177e4
LT		 677/* Generate new index... KAME seems to generate them ordered by cost
678 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 679static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 680{
1da177e4
LT		 681 static u32 idx_generator;
682
683 for (;;) {
2518c7c2
DM		 684 struct hlist_head *list;
685 struct xfrm_policy *p;
686 u32 idx;
687 int found;
688
e682adf0
FD		 689 if (!index) {
690 idx = (idx_generator | dir);
691 idx_generator += 8;
692 } else {
693 idx = index;
694 index = 0;
695 }
696
1da177e4
LT		 697 if (idx == 0)
698 idx = 8;
1121994c 699 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 700 found = 0;
b67bfe0d 701 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 702 if (p->index == idx) {
703 found = 1;
1da177e4 704 break;
2518c7c2 705 }
1da177e4 706 }
2518c7c2 707 if (!found)
1da177e4
LT		 708 return idx;
709 }
710}
711
2518c7c2
DM		 712static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
713{
714 u32 *p1 = (u32 *) s1;
715 u32 *p2 = (u32 *) s2;
716 int len = sizeof(struct xfrm_selector) / sizeof(u32);
717 int i;
718
719 for (i = 0; i < len; i++) {
720 if (p1[i] != p2[i])
721 return 1;
722 }
723
724 return 0;
725}
726
a0073fe1
SK		 727static void xfrm_policy_requeue(struct xfrm_policy *old,
728 struct xfrm_policy *new)
729{
730 struct xfrm_policy_queue *pq = &old->polq;
731 struct sk_buff_head list;
732
de2ad486
LR		 733 if (skb_queue_empty(&pq->hold_queue))
734 return;
735
a0073fe1
SK		 736 __skb_queue_head_init(&list);
737
738 spin_lock_bh(&pq->hold_queue.lock);
739 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 740 if (del_timer(&pq->hold_timer))
741 xfrm_pol_put(old);
a0073fe1
SK		 742 spin_unlock_bh(&pq->hold_queue.lock);
743
a0073fe1
SK		 744 pq = &new->polq;
745
746 spin_lock_bh(&pq->hold_queue.lock);
747 skb_queue_splice(&list, &pq->hold_queue);
748 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 749 if (!mod_timer(&pq->hold_timer, jiffies))
750 xfrm_pol_hold(new);
a0073fe1
SK		 751 spin_unlock_bh(&pq->hold_queue.lock);
752}
753
7cb8a939
SK		 754static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
755 struct xfrm_policy *pol)
756{
757 u32 mark = policy->mark.v & policy->mark.m;
758
759 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
760 return true;
761
762 if ((mark & pol->mark.m) == pol->mark.v &&
763 policy->priority == pol->priority)
764 return true;
765
766 return false;
767}
768
1da177e4
LT		 769int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
770{
1121994c 771 struct net *net = xp_net(policy);
2518c7c2
DM		 772 struct xfrm_policy *pol;
773 struct xfrm_policy *delpol;
774 struct hlist_head *chain;
b67bfe0d 775 struct hlist_node *newpos;
1da177e4 776
9d0380df 777 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1121994c 778 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM		 779 delpol = NULL;
780 newpos = NULL;
b67bfe0d 781 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 782 if (pol->type == policy->type &&
2518c7c2 783 !selector_cmp(&pol->selector, &policy->selector) &&
7cb8a939 784 xfrm_policy_mark_match(policy, pol) &&
a6c7ab55
HX		 785 xfrm_sec_ctx_match(pol->security, policy->security) &&
786 !WARN_ON(delpol)) {
1da177e4 787 if (excl) {
9d0380df 788 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 789 return -EEXIST;
790 }
1da177e4
LT		 791 delpol = pol;
792 if (policy->priority > pol->priority)
793 continue;
794 } else if (policy->priority >= pol->priority) {
a6c7ab55 795 newpos = &pol->bydst;
1da177e4
LT		 796 continue;
797 }
1da177e4
LT		 798 if (delpol)
799 break;
1da177e4
LT		 800 }
801 if (newpos)
1d023284 802 hlist_add_behind(&policy->bydst, newpos);
2518c7c2
DM		 803 else
804 hlist_add_head(&policy->bydst, chain);
12bfa8bd 805 __xfrm_policy_link(policy, dir);
ca925cf1 806 atomic_inc(&net->xfrm.flow_cache_genid);
ca4c3fc2 807
808 /* After previous checking, family can either be AF_INET or AF_INET6 */
809 if (policy->family == AF_INET)
810 rt_genid_bump_ipv4(net);
811 else
812 rt_genid_bump_ipv6(net);
813
a0073fe1
SK		 814 if (delpol) {
815 xfrm_policy_requeue(delpol, policy);
29fa0b30 816 __xfrm_policy_unlink(delpol, dir);
a0073fe1 817 }
e682adf0 818 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 819 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 820 policy->curlft.add_time = get_seconds();
1da177e4
LT		 821 policy->curlft.use_time = 0;
822 if (!mod_timer(&policy->timer, jiffies + HZ))
823 xfrm_pol_hold(policy);
9d0380df 824 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 825
9b78a82c 826 if (delpol)
1da177e4 827 xfrm_policy_kill(delpol);
1121994c
AD		 828 else if (xfrm_bydst_should_resize(net, dir, NULL))
829 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 830
1da177e4
LT		 831 return 0;
832}
833EXPORT_SYMBOL(xfrm_policy_insert);
834
8ca2e93b
JHS		 835struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
836 int dir, struct xfrm_selector *sel,
ef41aaa0
EP		 837 struct xfrm_sec_ctx *ctx, int delete,
838 int *err)
1da177e4 839{
2518c7c2
DM		 840 struct xfrm_policy *pol, *ret;
841 struct hlist_head *chain;
1da177e4 842
ef41aaa0 843 *err = 0;
9d0380df 844 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 845 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2 846 ret = NULL;
b67bfe0d 847 hlist_for_each_entry(pol, chain, bydst) {
2518c7c2 848 if (pol->type == type &&
34f8d884 849 (mark & pol->mark.m) == pol->mark.v &&
2518c7c2
DM		 850 !selector_cmp(sel, &pol->selector) &&
851 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 852 xfrm_pol_hold(pol);
2518c7c2 853 if (delete) {
03e1ad7b
PM		 854 *err = security_xfrm_policy_delete(
855 pol->security);
ef41aaa0 856 if (*err) {
9d0380df 857 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 858 return pol;
859 }
29fa0b30 860 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 861 }
862 ret = pol;
1da177e4
LT		 863 break;
864 }
865 }
9d0380df 866 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 867
fe1a5f03 868 if (ret && delete)
2518c7c2 869 xfrm_policy_kill(ret);
2518c7c2 870 return ret;
1da177e4 871}
df71837d 872EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 873
8ca2e93b
JHS		 874struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
875 int dir, u32 id, int delete, int *err)
1da177e4 876{
2518c7c2
DM		 877 struct xfrm_policy *pol, *ret;
878 struct hlist_head *chain;
1da177e4 879
b5505c6e
HX		 880 *err = -ENOENT;
881 if (xfrm_policy_id2dir(id) != dir)
882 return NULL;
883
ef41aaa0 884 *err = 0;
9d0380df 885 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 886 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 887 ret = NULL;
b67bfe0d 888 hlist_for_each_entry(pol, chain, byidx) {
34f8d884
JHS		 889 if (pol->type == type && pol->index == id &&
890 (mark & pol->mark.m) == pol->mark.v) {
1da177e4 891 xfrm_pol_hold(pol);
2518c7c2 892 if (delete) {
03e1ad7b
PM		 893 *err = security_xfrm_policy_delete(
894 pol->security);
ef41aaa0 895 if (*err) {
9d0380df 896 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 897 return pol;
898 }
29fa0b30 899 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 900 }
901 ret = pol;
1da177e4
LT		 902 break;
903 }
904 }
9d0380df 905 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 906
fe1a5f03 907 if (ret && delete)
2518c7c2 908 xfrm_policy_kill(ret);
2518c7c2 909 return ret;
1da177e4
LT		 910}
911EXPORT_SYMBOL(xfrm_policy_byid);
912
4aa2e62c
JL		 913#ifdef CONFIG_SECURITY_NETWORK_XFRM
914static inline int
2e71029e 915xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
1da177e4 916{
4aa2e62c
JL		 917 int dir, err = 0;
918
919 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
920 struct xfrm_policy *pol;
4aa2e62c
JL		 921 int i;
922
b67bfe0d 923 hlist_for_each_entry(pol,
33ffbbd5 924 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL		 925 if (pol->type != type)
926 continue;
03e1ad7b 927 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 928 if (err) {
2e71029e 929 xfrm_audit_policy_delete(pol, 0, task_valid);
4aa2e62c
JL		 930 return err;
931 }
7dc12d6d 932 }
33ffbbd5 933 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
b67bfe0d 934 hlist_for_each_entry(pol,
33ffbbd5 935 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL		 936 bydst) {
937 if (pol->type != type)
938 continue;
03e1ad7b
PM		 939 err = security_xfrm_policy_delete(
940 pol->security);
4aa2e62c 941 if (err) {
ab5f5e8b 942 xfrm_audit_policy_delete(pol, 0,
2e71029e 943 task_valid);
4aa2e62c
JL		 944 return err;
945 }
946 }
947 }
948 }
949 return err;
950}
951#else
952static inline int
2e71029e 953xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
4aa2e62c
JL		 954{
955 return 0;
956}
957#endif
958
2e71029e 959int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
4aa2e62c 960{
2f1eb65f 961 int dir, err = 0, cnt = 0;
1da177e4 962
9d0380df 963 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 964
2e71029e 965 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
4aa2e62c
JL		 966 if (err)
967 goto out;
968
1da177e4 969 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2 970 struct xfrm_policy *pol;
29fa0b30 971 int i;
2518c7c2
DM		 972
973 again1:
b67bfe0d 974 hlist_for_each_entry(pol,
33ffbbd5 975 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM		 976 if (pol->type != type)
977 continue;
ea2dea9d 978 __xfrm_policy_unlink(pol, dir);
9d0380df 979 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 980 cnt++;
1da177e4 981
2e71029e 982 xfrm_audit_policy_delete(pol, 1, task_valid);
161a09e7 983
2518c7c2 984 xfrm_policy_kill(pol);
1da177e4 985
4141b36a 986 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 987 goto again1;
988 }
989
33ffbbd5 990 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2 991 again2:
b67bfe0d 992 hlist_for_each_entry(pol,
33ffbbd5 993 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM		 994 bydst) {
995 if (pol->type != type)
996 continue;
ea2dea9d 997 __xfrm_policy_unlink(pol, dir);
9d0380df 998 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 999 cnt++;
2518c7c2 1000
2e71029e 1001 xfrm_audit_policy_delete(pol, 1, task_valid);
2518c7c2
DM		 1002 xfrm_policy_kill(pol);
1003
9d0380df 1004 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 1005 goto again2;
1006 }
1da177e4 1007 }
2518c7c2 1008
1da177e4 1009 }
2f1eb65f
JHS		 1010 if (!cnt)
1011 err = -ESRCH;
4aa2e62c 1012out:
9d0380df 1013 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 1014 return err;
1da177e4
LT		 1015}
1016EXPORT_SYMBOL(xfrm_policy_flush);
1017
cdcbca7c 1018int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 1019 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 1020 void *data)
1021{
12a169e7
HX		 1022 struct xfrm_policy *pol;
1023 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 1024 int error = 0;
1025
1026 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1027 walk->type != XFRM_POLICY_TYPE_ANY)
1028 return -EINVAL;
1da177e4 1029
12a169e7 1030 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 1031 return 0;
1032
9d0380df 1033 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 1034 if (list_empty(&walk->walk.all))
cdcbca7c 1035 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7 1036 else
80077702
LR		 1037 x = list_first_entry(&walk->walk.all,
1038 struct xfrm_policy_walk_entry, all);
1039
cdcbca7c 1040 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 1041 if (x->dead)
4c563f76 1042 continue;
12a169e7
HX		 1043 pol = container_of(x, struct xfrm_policy, walk);
1044 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1045 walk->type != pol->type)
1046 continue;
1047 error = func(pol, xfrm_policy_id2dir(pol->index),
1048 walk->seq, data);
1049 if (error) {
1050 list_move_tail(&walk->walk.all, &x->all);
1051 goto out;
2518c7c2 1052 }
12a169e7 1053 walk->seq++;
1da177e4 1054 }
12a169e7 1055 if (walk->seq == 0) {
baf5d743
JHS		 1056 error = -ENOENT;
1057 goto out;
1058 }
12a169e7 1059 list_del_init(&walk->walk.all);
1da177e4 1060out:
9d0380df 1061 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1062 return error;
1063}
1064EXPORT_SYMBOL(xfrm_policy_walk);
1065
12a169e7
HX		 1066void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1067{
1068 INIT_LIST_HEAD(&walk->walk.all);
1069 walk->walk.dead = 1;
1070 walk->type = type;
1071 walk->seq = 0;
1072}
1073EXPORT_SYMBOL(xfrm_policy_walk_init);
1074
283bc9f3 1075void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 1076{
1077 if (list_empty(&walk->walk.all))
1078 return;
1079
9d0380df 1080 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 1081 list_del(&walk->walk.all);
9d0380df 1082 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 1083}
1084EXPORT_SYMBOL(xfrm_policy_walk_done);
1085
134b0fc5
JM		 1086/*
1087 * Find policy to apply to this flow.
1088 *
1089 * Returns 0 if policy found, else an -errno.
1090 */
f299d557
DM		 1091static int xfrm_policy_match(const struct xfrm_policy *pol,
1092 const struct flowi *fl,
2518c7c2 1093 u8 type, u16 family, int dir)
1da177e4 1094{
f299d557 1095 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 1096 int ret = -ESRCH;
1097 bool match;
1da177e4 1098
2518c7c2 1099 if (pol->family != family ||
1d28f42c 1100 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 1101 pol->type != type)
134b0fc5 1102 return ret;
1da177e4 1103
2518c7c2 1104 match = xfrm_selector_match(sel, fl, family);
134b0fc5 1105 if (match)
1d28f42c 1106 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 1107 dir);
2518c7c2 1108
134b0fc5 1109 return ret;
2518c7c2 1110}
1da177e4 1111
52479b62 1112static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 1113 const struct flowi *fl,
2518c7c2
DM		 1114 u16 family, u8 dir)
1115{
134b0fc5 1116 int err;
2518c7c2 1117 struct xfrm_policy *pol, *ret;
0b597e7e 1118 const xfrm_address_t *daddr, *saddr;
2518c7c2 1119 struct hlist_head *chain;
30846090
FW		 1120 unsigned int sequence;
1121 u32 priority;
df71837d 1122
2518c7c2
DM		 1123 daddr = xfrm_flowi_daddr(fl, family);
1124 saddr = xfrm_flowi_saddr(fl, family);
1125 if (unlikely(!daddr || !saddr))
1126 return NULL;
1127
a7c44247 1128 rcu_read_lock();
30846090
FW		 1129 retry:
1130 do {
1131 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1132 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1133 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1134
1135 priority = ~0U;
2518c7c2 1136 ret = NULL;
a5eefc1d 1137 hlist_for_each_entry_rcu(pol, chain, bydst) {
134b0fc5
JM		 1138 err = xfrm_policy_match(pol, fl, type, family, dir);
1139 if (err) {
1140 if (err == -ESRCH)
1141 continue;
1142 else {
1143 ret = ERR_PTR(err);
1144 goto fail;
1145 }
1146 } else {
2518c7c2 1147 ret = pol;
acba48e1 1148 priority = ret->priority;
2518c7c2
DM		 1149 break;
1150 }
1151 }
52479b62 1152 chain = &net->xfrm.policy_inexact[dir];
a5eefc1d 1153 hlist_for_each_entry_rcu(pol, chain, bydst) {
8faf491e
LR		 1154 if ((pol->priority >= priority) && ret)
1155 break;
1156
134b0fc5
JM		 1157 err = xfrm_policy_match(pol, fl, type, family, dir);
1158 if (err) {
1159 if (err == -ESRCH)
1160 continue;
1161 else {
1162 ret = ERR_PTR(err);
1163 goto fail;
1164 }
8faf491e 1165 } else {
acba48e1
DM		 1166 ret = pol;
1167 break;
1da177e4
LT		 1168 }
1169 }
586f2eb4 1170
30846090
FW		 1171 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1172 goto retry;
1173
e37cc8ad
FW		 1174 if (ret && !xfrm_pol_hold_rcu(ret))
1175 goto retry;
134b0fc5 1176fail:
a7c44247 1177 rcu_read_unlock();
4e81bb83 1178
2518c7c2 1179 return ret;
4e81bb83
MN		 1180}
1181
80c802f3 1182static struct xfrm_policy *
73ff93cd 1183__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1184{
1185#ifdef CONFIG_XFRM_SUB_POLICY
1186 struct xfrm_policy *pol;
1187
1188 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1189 if (pol != NULL)
1190 return pol;
1191#endif
1192 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1193}
1194
b5fb82c4
BZ		 1195static int flow_to_policy_dir(int dir)
1196{
1197 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1198 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1199 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1200 return dir;
1201
1202 switch (dir) {
1203 default:
1204 case FLOW_DIR_IN:
1205 return XFRM_POLICY_IN;
1206 case FLOW_DIR_OUT:
1207 return XFRM_POLICY_OUT;
1208 case FLOW_DIR_FWD:
1209 return XFRM_POLICY_FWD;
1210 }
1211}
1212
fe1a5f03 1213static struct flow_cache_object *
dee9f4bc 1214xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
fe1a5f03 1215 u8 dir, struct flow_cache_object *old_obj, void *ctx)
4e81bb83
MN		 1216{
1217 struct xfrm_policy *pol;
fe1a5f03
TT		 1218
1219 if (old_obj)
1220 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
4e81bb83 1221
b5fb82c4 1222 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
80c802f3 1223 if (IS_ERR_OR_NULL(pol))
fe1a5f03 1224 return ERR_CAST(pol);
fe1a5f03 1225
fe1a5f03
TT		 1226 /* Resolver returns two references:
1227 * one for cache and one for caller of flow_cache_lookup() */
1228 xfrm_pol_hold(pol);
1229
1230 return &pol->flo;
1da177e4
LT		 1231}
1232
df71837d
TJ		 1233static inline int policy_to_flow_dir(int dir)
1234{
1235 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH		 1236 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1237 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1238 return dir;
1239 switch (dir) {
1240 default:
1241 case XFRM_POLICY_IN:
1242 return FLOW_DIR_IN;
1243 case XFRM_POLICY_OUT:
1244 return FLOW_DIR_OUT;
1245 case XFRM_POLICY_FWD:
1246 return FLOW_DIR_FWD;
3ff50b79 1247 }
df71837d
TJ		 1248}
1249
6f9c9615 1250static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
dee9f4bc 1251 const struct flowi *fl)
1da177e4
LT		 1252{
1253 struct xfrm_policy *pol;
1254
d188ba86 1255 rcu_read_lock();
ae33786f 1256 again:
d188ba86
ED		 1257 pol = rcu_dereference(sk->sk_policy[dir]);
1258 if (pol != NULL) {
bc9b35ad
DM		 1259 bool match = xfrm_selector_match(&pol->selector, fl,
1260 sk->sk_family);
a716c119 1261 int err = 0;
df71837d 1262
3bccfbc7 1263 if (match) {
34f8d884
JHS		 1264 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1265 pol = NULL;
1266 goto out;
1267 }
03e1ad7b 1268 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1269 fl->flowi_secid,
03e1ad7b 1270 policy_to_flow_dir(dir));
330e832a
FW		 1271 if (!err) {
1272 if (!xfrm_pol_hold_rcu(pol))
1273 goto again;
1274 } else if (err == -ESRCH) {
3bccfbc7 1275 pol = NULL;
330e832a 1276 } else {
3bccfbc7 1277 pol = ERR_PTR(err);
330e832a 1278 }
3bccfbc7 1279 } else
1da177e4
LT		 1280 pol = NULL;
1281 }
34f8d884 1282out:
d188ba86 1283 rcu_read_unlock();
1da177e4
LT		 1284 return pol;
1285}
1286
1287static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1288{
98806f75 1289 struct net *net = xp_net(pol);
4e81bb83 1290
98806f75 1291 list_add(&pol->walk.all, &net->xfrm.policy_all);
98806f75 1292 net->xfrm.policy_count[dir]++;
1da177e4
LT		 1293 xfrm_pol_hold(pol);
1294}
1295
1296static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1297 int dir)
1298{
98806f75
AD		 1299 struct net *net = xp_net(pol);
1300
53c2e285 1301 if (list_empty(&pol->walk.all))
2518c7c2 1302 return NULL;
1da177e4 1303
53c2e285
HX		 1304 /* Socket policies are not hashed. */
1305 if (!hlist_unhashed(&pol->bydst)) {
a5eefc1d 1306 hlist_del_rcu(&pol->bydst);
53c2e285
HX		 1307 hlist_del(&pol->byidx);
1308 }
1309
1310 list_del_init(&pol->walk.all);
98806f75 1311 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1312
1313 return pol;
1da177e4
LT		 1314}
1315
53c2e285
HX		 1316static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1317{
1318 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1319}
1320
1321static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1322{
1323 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1324}
1325
4666faab 1326int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1327{
283bc9f3
FD		 1328 struct net *net = xp_net(pol);
1329
9d0380df 1330 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1331 pol = __xfrm_policy_unlink(pol, dir);
9d0380df 1332 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1333 if (pol) {
1da177e4 1334 xfrm_policy_kill(pol);
4666faab 1335 return 0;
1da177e4 1336 }
4666faab 1337 return -ENOENT;
1da177e4 1338}
a70fcb0b 1339EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1340
1341int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1342{
1121994c 1343 struct net *net = xp_net(pol);
1da177e4
LT		 1344 struct xfrm_policy *old_pol;
1345
4e81bb83
MN		 1346#ifdef CONFIG_XFRM_SUB_POLICY
1347 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1348 return -EINVAL;
1349#endif
1350
9d0380df 1351 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
d188ba86
ED		 1352 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1353 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1da177e4 1354 if (pol) {
9d729f72 1355 pol->curlft.add_time = get_seconds();
e682adf0 1356 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
53c2e285 1357 xfrm_sk_policy_link(pol, dir);
1da177e4 1358 }
d188ba86 1359 rcu_assign_pointer(sk->sk_policy[dir], pol);
a0073fe1
SK		 1360 if (old_pol) {
1361 if (pol)
1362 xfrm_policy_requeue(old_pol, pol);
1363
ea2dea9d
TT		 1364 /* Unlinking succeeds always. This is the only function
1365 * allowed to delete or replace socket policy.
1366 */
53c2e285 1367 xfrm_sk_policy_unlink(old_pol, dir);
a0073fe1 1368 }
9d0380df 1369 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1370
1371 if (old_pol) {
1372 xfrm_policy_kill(old_pol);
1373 }
1374 return 0;
1375}
1376
d3e40a9f 1377static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1378{
0331b1f3 1379 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1380 struct net *net = xp_net(old);
1da177e4
LT		 1381
1382 if (newp) {
1383 newp->selector = old->selector;
03e1ad7b
PM		 1384 if (security_xfrm_policy_clone(old->security,
1385 &newp->security)) {
df71837d
TJ		 1386 kfree(newp);
1387 return NULL; /* ENOMEM */
1388 }
1da177e4
LT		 1389 newp->lft = old->lft;
1390 newp->curlft = old->curlft;
fb977e2c 1391 newp->mark = old->mark;
1da177e4
LT		 1392 newp->action = old->action;
1393 newp->flags = old->flags;
1394 newp->xfrm_nr = old->xfrm_nr;
1395 newp->index = old->index;
4e81bb83 1396 newp->type = old->type;
1da177e4
LT		 1397 memcpy(newp->xfrm_vec, old->xfrm_vec,
1398 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
9d0380df 1399 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
53c2e285 1400 xfrm_sk_policy_link(newp, dir);
9d0380df 1401 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1402 xfrm_pol_put(newp);
1403 }
1404 return newp;
1405}
1406
d188ba86 1407int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1da177e4 1408{
d188ba86
ED		 1409 const struct xfrm_policy *p;
1410 struct xfrm_policy *np;
1411 int i, ret = 0;
1412
1413 rcu_read_lock();
1414 for (i = 0; i < 2; i++) {
1415 p = rcu_dereference(osk->sk_policy[i]);
1416 if (p) {
1417 np = clone_policy(p, i);
1418 if (unlikely(!np)) {
1419 ret = -ENOMEM;
1420 break;
1421 }
1422 rcu_assign_pointer(sk->sk_policy[i], np);
1423 }
1424 }
1425 rcu_read_unlock();
1426 return ret;
1da177e4
LT		 1427}
1428
a1e59abf 1429static int
42a7b32b
DA		 1430xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1431 xfrm_address_t *remote, unsigned short family)
a1e59abf
PM		 1432{
1433 int err;
1434 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1435
1436 if (unlikely(afinfo == NULL))
1437 return -EINVAL;
42a7b32b 1438 err = afinfo->get_saddr(net, oif, local, remote);
a1e59abf
PM		 1439 xfrm_policy_put_afinfo(afinfo);
1440 return err;
1441}
1442
1da177e4
LT		 1443/* Resolve list of templates for the flow, given policy. */
1444
1445static int
a6c2e611
DM		 1446xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1447 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1448{
fbda33b2 1449 struct net *net = xp_net(policy);
1da177e4
LT		 1450 int nx;
1451 int i, error;
1452 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1453 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1454 xfrm_address_t tmp;
1da177e4 1455
9b7a787d 1456 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4
LT		 1457 struct xfrm_state *x;
1458 xfrm_address_t *remote = daddr;
1459 xfrm_address_t *local = saddr;
1460 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1461
48b8d783
JK		 1462 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1463 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT		 1464 remote = &tmpl->id.daddr;
1465 local = &tmpl->saddr;
8444cf71 1466 if (xfrm_addr_any(local, tmpl->encap_family)) {
42a7b32b
DA		 1467 error = xfrm_get_saddr(net, fl->flowi_oif,
1468 &tmp, remote,
1469 tmpl->encap_family);
a1e59abf
PM		 1470 if (error)
1471 goto fail;
1472 local = &tmp;
1473 }
1da177e4
LT		 1474 }
1475
1476 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1477
1478 if (x && x->km.state == XFRM_STATE_VALID) {
1479 xfrm[nx++] = x;
1480 daddr = remote;
1481 saddr = local;
1482 continue;
1483 }
1484 if (x) {
1485 error = (x->km.state == XFRM_STATE_ERROR ?
1486 -EINVAL : -EAGAIN);
1487 xfrm_state_put(x);
42054569 1488 } else if (error == -ESRCH) {
a4322266 1489 error = -EAGAIN;
42054569 1490 }
1da177e4
LT		 1491
1492 if (!tmpl->optional)
1493 goto fail;
1494 }
1495 return nx;
1496
1497fail:
9b7a787d 1498 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1499 xfrm_state_put(xfrm[nx]);
1500 return error;
1501}
1502
4e81bb83 1503static int
a6c2e611
DM		 1504xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1505 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1506{
41a49cc3
MN		 1507 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1508 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1509 int cnx = 0;
1510 int error;
1511 int ret;
1512 int i;
1513
1514 for (i = 0; i < npols; i++) {
1515 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1516 error = -ENOBUFS;
1517 goto fail;
1518 }
41a49cc3
MN		 1519
1520 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1521 if (ret < 0) {
1522 error = ret;
1523 goto fail;
1524 } else
1525 cnx += ret;
1526 }
1527
41a49cc3
MN		 1528 /* found states are sorted for outbound processing */
1529 if (npols > 1)
1530 xfrm_state_sort(xfrm, tpp, cnx, family);
1531
4e81bb83
MN		 1532 return cnx;
1533
1534 fail:
9b7a787d 1535 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1536 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1537 return error;
1538
1539}
1540
1da177e4
LT		 1541/* Check that the bundle accepts the flow and its components are
1542 * still valid.
1543 */
1544
05d84025 1545static inline int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286
HX		 1546{
1547 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1548 int tos;
1da177e4 1549
25ee3286
HX		 1550 if (!afinfo)
1551 return -EINVAL;
1552
1553 tos = afinfo->get_tos(fl);
1554
1555 xfrm_policy_put_afinfo(afinfo);
1556
1557 return tos;
1558}
1559
80c802f3
TT		 1560static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1561{
1562 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1563 struct dst_entry *dst = &xdst->u.dst;
1564
1565 if (xdst->route == NULL) {
1566 /* Dummy bundle - if it has xfrms we were not
1567 * able to build bundle as template resolution failed.
1568 * It means we need to try again resolving. */
1569 if (xdst->num_xfrms > 0)
1570 return NULL;
a0073fe1
SK		 1571 } else if (dst->flags & DST_XFRM_QUEUE) {
1572 return NULL;
80c802f3
TT		 1573 } else {
1574 /* Real bundle */
1575 if (stale_bundle(dst))
1576 return NULL;
1577 }
1578
1579 dst_hold(dst);
1580 return flo;
1581}
1582
1583static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1584{
1585 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1586 struct dst_entry *dst = &xdst->u.dst;
1587
1588 if (!xdst->route)
1589 return 0;
1590 if (stale_bundle(dst))
1591 return 0;
1592
1593 return 1;
1594}
1595
1596static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1597{
1598 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1599 struct dst_entry *dst = &xdst->u.dst;
1600
1601 dst_free(dst);
1602}
1603
1604static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1605 .get = xfrm_bundle_flo_get,
1606 .check = xfrm_bundle_flo_check,
1607 .delete = xfrm_bundle_flo_delete,
1608};
1609
d7c7544c 1610static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1611{
1da177e4 1612 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1613 struct dst_ops *dst_ops;
25ee3286
HX		 1614 struct xfrm_dst *xdst;
1615
1616 if (!afinfo)
1617 return ERR_PTR(-EINVAL);
1618
d7c7544c
AD		 1619 switch (family) {
1620 case AF_INET:
1621 dst_ops = &net->xfrm.xfrm4_dst_ops;
1622 break;
dfd56b8b 1623#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1624 case AF_INET6:
1625 dst_ops = &net->xfrm.xfrm6_dst_ops;
1626 break;
1627#endif
1628 default:
1629 BUG();
1630 }
f5b0a874 1631 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
25ee3286 1632
d4cae562 1633 if (likely(xdst)) {
141e369d
SK		 1634 struct dst_entry *dst = &xdst->u.dst;
1635
1636 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
0b150932 1637 xdst->flo.ops = &xfrm_bundle_fc_ops;
d4cae562 1638 } else
0b150932 1639 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1640
d4cae562
MB		 1641 xfrm_policy_put_afinfo(afinfo);
1642
25ee3286
HX		 1643 return xdst;
1644}
1645
a1b05140
MN		 1646static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1647 int nfheader_len)
1648{
1649 struct xfrm_policy_afinfo *afinfo =
1650 xfrm_policy_get_afinfo(dst->ops->family);
1651 int err;
1652
1653 if (!afinfo)
1654 return -EINVAL;
1655
1656 err = afinfo->init_path(path, dst, nfheader_len);
1657
1658 xfrm_policy_put_afinfo(afinfo);
1659
1660 return err;
1661}
1662
87c1e12b 1663static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1664 const struct flowi *fl)
25ee3286
HX		 1665{
1666 struct xfrm_policy_afinfo *afinfo =
1667 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1668 int err;
1669
1670 if (!afinfo)
1da177e4 1671 return -EINVAL;
25ee3286 1672
87c1e12b 1673 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1674
1da177e4 1675 xfrm_policy_put_afinfo(afinfo);
25ee3286 1676
1da177e4
LT		 1677 return err;
1678}
1679
80c802f3 1680
25ee3286
HX		 1681/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1682 * all the metrics... Shortly, bundle a bundle.
1683 */
1684
1685static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1686 struct xfrm_state **xfrm, int nx,
98313ada 1687 const struct flowi *fl,
25ee3286
HX		 1688 struct dst_entry *dst)
1689{
d7c7544c 1690 struct net *net = xp_net(policy);
25ee3286
HX		 1691 unsigned long now = jiffies;
1692 struct net_device *dev;
43a4dea4 1693 struct xfrm_mode *inner_mode;
25ee3286
HX		 1694 struct dst_entry *dst_prev = NULL;
1695 struct dst_entry *dst0 = NULL;
1696 int i = 0;
1697 int err;
1698 int header_len = 0;
a1b05140 1699 int nfheader_len = 0;
25ee3286
HX		 1700 int trailer_len = 0;
1701 int tos;
1702 int family = policy->selector.family;
9bb182a7
YH		 1703 xfrm_address_t saddr, daddr;
1704
1705 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1706
1707 tos = xfrm_get_tos(fl, family);
1708 err = tos;
1709 if (tos < 0)
1710 goto put_states;
1711
1712 dst_hold(dst);
1713
1714 for (; i < nx; i++) {
d7c7544c 1715 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1716 struct dst_entry *dst1 = &xdst->u.dst;
1717
1718 err = PTR_ERR(xdst);
1719 if (IS_ERR(xdst)) {
1720 dst_release(dst);
1721 goto put_states;
1722 }
1723
43a4dea4
SK		 1724 if (xfrm[i]->sel.family == AF_UNSPEC) {
1725 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1726 xfrm_af2proto(family));
1727 if (!inner_mode) {
1728 err = -EAFNOSUPPORT;
1729 dst_release(dst);
1730 goto put_states;
1731 }
1732 } else
1733 inner_mode = xfrm[i]->inner_mode;
1734
25ee3286
HX		 1735 if (!dst_prev)
1736 dst0 = dst1;
1737 else {
1738 dst_prev->child = dst_clone(dst1);
1739 dst1->flags |= DST_NOHASH;
1740 }
1741
1742 xdst->route = dst;
defb3519 1743 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1744
1745 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1746 family = xfrm[i]->props.family;
42a7b32b
DA		 1747 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1748 &saddr, &daddr, family);
25ee3286
HX		 1749 err = PTR_ERR(dst);
1750 if (IS_ERR(dst))
1751 goto put_states;
1752 } else
1753 dst_hold(dst);
1754
1755 dst1->xfrm = xfrm[i];
80c802f3 1756 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1757
f5b0a874 1758 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1759 dst1->flags |= DST_HOST;
1760 dst1->lastuse = now;
1761
1762 dst1->input = dst_discard;
43a4dea4 1763 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1764
1765 dst1->next = dst_prev;
1766 dst_prev = dst1;
1767
1768 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1769 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1770 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1771 trailer_len += xfrm[i]->props.trailer_len;
1772 }
1773
1774 dst_prev->child = dst;
1775 dst0->path = dst;
1776
1777 err = -ENODEV;
1778 dev = dst->dev;
1779 if (!dev)
1780 goto free_dst;
1781
a1b05140 1782 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1783 xfrm_init_pmtu(dst_prev);
1784
1785 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1786 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1787
87c1e12b 1788 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1789 if (err)
1790 goto free_dst;
1791
1792 dst_prev->header_len = header_len;
1793 dst_prev->trailer_len = trailer_len;
1794 header_len -= xdst->u.dst.xfrm->props.header_len;
1795 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1796 }
1797
1798out:
1799 return dst0;
1800
1801put_states:
1802 for (; i < nx; i++)
1803 xfrm_state_put(xfrm[i]);
1804free_dst:
1805 if (dst0)
1806 dst_free(dst0);
1807 dst0 = ERR_PTR(err);
1808 goto out;
1809}
1810
da7c224b 1811#ifdef CONFIG_XFRM_SUB_POLICY
be7928d2 1812static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
157bfc25
MN		 1813{
1814 if (!*target) {
1815 *target = kmalloc(size, GFP_ATOMIC);
1816 if (!*target)
1817 return -ENOMEM;
1818 }
be7928d2 1819
157bfc25
MN		 1820 memcpy(*target, src, size);
1821 return 0;
1822}
da7c224b 1823#endif
157bfc25 1824
be7928d2
DB		 1825static int xfrm_dst_update_parent(struct dst_entry *dst,
1826 const struct xfrm_selector *sel)
157bfc25
MN		 1827{
1828#ifdef CONFIG_XFRM_SUB_POLICY
1829 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1830 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1831 sel, sizeof(*sel));
1832#else
1833 return 0;
1834#endif
1835}
1836
be7928d2
DB		 1837static int xfrm_dst_update_origin(struct dst_entry *dst,
1838 const struct flowi *fl)
157bfc25
MN		 1839{
1840#ifdef CONFIG_XFRM_SUB_POLICY
1841 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1842 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1843#else
1844 return 0;
1845#endif
1846}
1da177e4 1847
73ff93cd 1848static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1849 struct xfrm_policy **pols,
1850 int *num_pols, int *num_xfrms)
1851{
1852 int i;
1853
1854 if (*num_pols == 0 || !pols[0]) {
1855 *num_pols = 0;
1856 *num_xfrms = 0;
1857 return 0;
1858 }
1859 if (IS_ERR(pols[0]))
1860 return PTR_ERR(pols[0]);
1861
1862 *num_xfrms = pols[0]->xfrm_nr;
1863
1864#ifdef CONFIG_XFRM_SUB_POLICY
1865 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1866 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1867 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1868 XFRM_POLICY_TYPE_MAIN,
1869 fl, family,
1870 XFRM_POLICY_OUT);
1871 if (pols[1]) {
1872 if (IS_ERR(pols[1])) {
1873 xfrm_pols_put(pols, *num_pols);
1874 return PTR_ERR(pols[1]);
1875 }
02d0892f 1876 (*num_pols)++;
80c802f3
TT		 1877 (*num_xfrms) += pols[1]->xfrm_nr;
1878 }
1879 }
1880#endif
1881 for (i = 0; i < *num_pols; i++) {
1882 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1883 *num_xfrms = -1;
1884 break;
1885 }
1886 }
1887
1888 return 0;
1889
1890}
1891
1892static struct xfrm_dst *
1893xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1894 const struct flowi *fl, u16 family,
80c802f3
TT		 1895 struct dst_entry *dst_orig)
1896{
1897 struct net *net = xp_net(pols[0]);
1898 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1899 struct dst_entry *dst;
1900 struct xfrm_dst *xdst;
1901 int err;
1902
1903 /* Try to instantiate a bundle */
1904 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1905 if (err <= 0) {
1906 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1907 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1908 return ERR_PTR(err);
1909 }
1910
1911 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1912 if (IS_ERR(dst)) {
1913 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1914 return ERR_CAST(dst);
1915 }
1916
1917 xdst = (struct xfrm_dst *)dst;
1918 xdst->num_xfrms = err;
1919 if (num_pols > 1)
1920 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1921 else
1922 err = xfrm_dst_update_origin(dst, fl);
1923 if (unlikely(err)) {
1924 dst_free(dst);
1925 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1926 return ERR_PTR(err);
1927 }
1928
1929 xdst->num_pols = num_pols;
3e94c2dc 1930 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1931 xdst->policy_genid = atomic_read(&pols[0]->genid);
1932
1933 return xdst;
1934}
1935
a0073fe1
SK		 1936static void xfrm_policy_queue_process(unsigned long arg)
1937{
a0073fe1
SK		 1938 struct sk_buff *skb;
1939 struct sock *sk;
1940 struct dst_entry *dst;
a0073fe1 1941 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
3f5312ae 1942 struct net *net = xp_net(pol);
a0073fe1
SK		 1943 struct xfrm_policy_queue *pq = &pol->polq;
1944 struct flowi fl;
1945 struct sk_buff_head list;
1946
1947 spin_lock(&pq->hold_queue.lock);
1948 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1949 if (!skb) {
1950 spin_unlock(&pq->hold_queue.lock);
1951 goto out;
1952 }
a0073fe1
SK		 1953 dst = skb_dst(skb);
1954 sk = skb->sk;
1955 xfrm_decode_session(skb, &fl, dst->ops->family);
1956 spin_unlock(&pq->hold_queue.lock);
1957
1958 dst_hold(dst->path);
3f5312ae 1959 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
a0073fe1
SK		 1960 if (IS_ERR(dst))
1961 goto purge_queue;
1962
1963 if (dst->flags & DST_XFRM_QUEUE) {
1964 dst_release(dst);
1965
1966 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1967 goto purge_queue;
1968
1969 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1970 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1971 xfrm_pol_hold(pol);
1972 goto out;
a0073fe1
SK		 1973 }
1974
1975 dst_release(dst);
1976
1977 __skb_queue_head_init(&list);
1978
1979 spin_lock(&pq->hold_queue.lock);
1980 pq->timeout = 0;
1981 skb_queue_splice_init(&pq->hold_queue, &list);
1982 spin_unlock(&pq->hold_queue.lock);
1983
1984 while (!skb_queue_empty(&list)) {
1985 skb = __skb_dequeue(&list);
1986
1987 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1988 dst_hold(skb_dst(skb)->path);
3f5312ae 1989 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
a0073fe1 1990 if (IS_ERR(dst)) {
a0073fe1
SK		 1991 kfree_skb(skb);
1992 continue;
1993 }
1994
1995 nf_reset(skb);
1996 skb_dst_drop(skb);
1997 skb_dst_set(skb, dst);
1998
13206b6b 1999 dst_output(net, skb->sk, skb);
a0073fe1
SK		 2000 }
2001
e7d8f6cb
SK		 2002out:
2003 xfrm_pol_put(pol);
a0073fe1
SK		 2004 return;
2005
2006purge_queue:
2007 pq->timeout = 0;
1ee5e667 2008 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 2009 xfrm_pol_put(pol);
a0073fe1
SK		 2010}
2011
ede2059d 2012static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 2013{
2014 unsigned long sched_next;
2015 struct dst_entry *dst = skb_dst(skb);
2016 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 2017 struct xfrm_policy *pol = xdst->pols[0];
2018 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 2019
39bb5e62 2020 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 2021 kfree_skb(skb);
2022 return 0;
2023 }
a0073fe1
SK		 2024
2025 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
2026 kfree_skb(skb);
2027 return -EAGAIN;
2028 }
2029
2030 skb_dst_force(skb);
a0073fe1
SK		 2031
2032 spin_lock_bh(&pq->hold_queue.lock);
2033
2034 if (!pq->timeout)
2035 pq->timeout = XFRM_QUEUE_TMO_MIN;
2036
2037 sched_next = jiffies + pq->timeout;
2038
2039 if (del_timer(&pq->hold_timer)) {
2040 if (time_before(pq->hold_timer.expires, sched_next))
2041 sched_next = pq->hold_timer.expires;
e7d8f6cb 2042 xfrm_pol_put(pol);
a0073fe1
SK		 2043 }
2044
2045 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 2046 if (!mod_timer(&pq->hold_timer, sched_next))
2047 xfrm_pol_hold(pol);
a0073fe1
SK		 2048
2049 spin_unlock_bh(&pq->hold_queue.lock);
2050
2051 return 0;
2052}
2053
2054static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 2055 struct xfrm_flo *xflo,
a0073fe1
SK		 2056 const struct flowi *fl,
2057 int num_xfrms,
2058 u16 family)
2059{
2060 int err;
2061 struct net_device *dev;
b8c203b2 2062 struct dst_entry *dst;
a0073fe1
SK		 2063 struct dst_entry *dst1;
2064 struct xfrm_dst *xdst;
2065
2066 xdst = xfrm_alloc_dst(net, family);
2067 if (IS_ERR(xdst))
2068 return xdst;
2069
b8c203b2
SK		 2070 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2071 net->xfrm.sysctl_larval_drop ||
2072 num_xfrms <= 0)
a0073fe1
SK		 2073 return xdst;
2074
b8c203b2 2075 dst = xflo->dst_orig;
a0073fe1
SK		 2076 dst1 = &xdst->u.dst;
2077 dst_hold(dst);
2078 xdst->route = dst;
2079
2080 dst_copy_metrics(dst1, dst);
2081
2082 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2083 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2084 dst1->lastuse = jiffies;
2085
2086 dst1->input = dst_discard;
2087 dst1->output = xdst_queue_output;
2088
2089 dst_hold(dst);
2090 dst1->child = dst;
2091 dst1->path = dst;
2092
2093 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2094
2095 err = -ENODEV;
2096 dev = dst->dev;
2097 if (!dev)
2098 goto free_dst;
2099
2100 err = xfrm_fill_dst(xdst, dev, fl);
2101 if (err)
2102 goto free_dst;
2103
2104out:
2105 return xdst;
2106
2107free_dst:
2108 dst_release(dst1);
2109 xdst = ERR_PTR(err);
2110 goto out;
2111}
2112
80c802f3 2113static struct flow_cache_object *
dee9f4bc 2114xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 2115 struct flow_cache_object *oldflo, void *ctx)
2116{
b8c203b2 2117 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
80c802f3
TT		 2118 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2119 struct xfrm_dst *xdst, *new_xdst;
2120 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2121
2122 /* Check if the policies from old bundle are usable */
2123 xdst = NULL;
2124 if (oldflo) {
2125 xdst = container_of(oldflo, struct xfrm_dst, flo);
2126 num_pols = xdst->num_pols;
2127 num_xfrms = xdst->num_xfrms;
2128 pol_dead = 0;
2129 for (i = 0; i < num_pols; i++) {
2130 pols[i] = xdst->pols[i];
2131 pol_dead |= pols[i]->walk.dead;
2132 }
2133 if (pol_dead) {
2134 dst_free(&xdst->u.dst);
2135 xdst = NULL;
2136 num_pols = 0;
2137 num_xfrms = 0;
2138 oldflo = NULL;
2139 }
2140 }
2141
2142 /* Resolve policies to use if we couldn't get them from
2143 * previous cache entry */
2144 if (xdst == NULL) {
2145 num_pols = 1;
b5fb82c4
BZ		 2146 pols[0] = __xfrm_policy_lookup(net, fl, family,
2147 flow_to_policy_dir(dir));
80c802f3
TT		 2148 err = xfrm_expand_policies(fl, family, pols,
2149 &num_pols, &num_xfrms);
2150 if (err < 0)
2151 goto inc_error;
2152 if (num_pols == 0)
2153 return NULL;
2154 if (num_xfrms <= 0)
2155 goto make_dummy_bundle;
2156 }
2157
b8c203b2
SK		 2158 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2159 xflo->dst_orig);
80c802f3
TT		 2160 if (IS_ERR(new_xdst)) {
2161 err = PTR_ERR(new_xdst);
2162 if (err != -EAGAIN)
2163 goto error;
2164 if (oldflo == NULL)
2165 goto make_dummy_bundle;
2166 dst_hold(&xdst->u.dst);
2167 return oldflo;
d809ec89
TT		 2168 } else if (new_xdst == NULL) {
2169 num_xfrms = 0;
2170 if (oldflo == NULL)
2171 goto make_dummy_bundle;
2172 xdst->num_xfrms = 0;
2173 dst_hold(&xdst->u.dst);
2174 return oldflo;
80c802f3
TT		 2175 }
2176
2177 /* Kill the previous bundle */
2178 if (xdst) {
2179 /* The policies were stolen for newly generated bundle */
2180 xdst->num_pols = 0;
2181 dst_free(&xdst->u.dst);
2182 }
2183
2184 /* Flow cache does not have reference, it dst_free()'s,
2185 * but we do need to return one reference for original caller */
2186 dst_hold(&new_xdst->u.dst);
2187 return &new_xdst->flo;
2188
2189make_dummy_bundle:
2190 /* We found policies, but there's no bundles to instantiate:
2191 * either because the policy blocks, has no transformations or
2192 * we could not build template (no xfrm_states).*/
b8c203b2 2193 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 2194 if (IS_ERR(xdst)) {
2195 xfrm_pols_put(pols, num_pols);
2196 return ERR_CAST(xdst);
2197 }
2198 xdst->num_pols = num_pols;
2199 xdst->num_xfrms = num_xfrms;
3e94c2dc 2200 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2201
2202 dst_hold(&xdst->u.dst);
2203 return &xdst->flo;
2204
2205inc_error:
2206 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2207error:
2208 if (xdst != NULL)
2209 dst_free(&xdst->u.dst);
2210 else
2211 xfrm_pols_put(pols, num_pols);
2212 return ERR_PTR(err);
2213}
1da177e4 2214
2774c131
DM		 2215static struct dst_entry *make_blackhole(struct net *net, u16 family,
2216 struct dst_entry *dst_orig)
2217{
2218 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2219 struct dst_entry *ret;
2220
2221 if (!afinfo) {
2222 dst_release(dst_orig);
433a1954 2223 return ERR_PTR(-EINVAL);
2774c131
DM		 2224 } else {
2225 ret = afinfo->blackhole_route(net, dst_orig);
2226 }
2227 xfrm_policy_put_afinfo(afinfo);
2228
2229 return ret;
2230}
2231
1da177e4
LT		 2232/* Main function: finds/creates a bundle for given flow.
2233 *
2234 * At the moment we eat a raw IP route. Mostly to speed up lookups
2235 * on interfaces with disabled IPsec.
2236 */
452edd59
DM		 2237struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2238 const struct flowi *fl,
6f9c9615 2239 const struct sock *sk, int flags)
1da177e4 2240{
4e81bb83 2241 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2242 struct flow_cache_object *flo;
2243 struct xfrm_dst *xdst;
452edd59 2244 struct dst_entry *dst, *route;
80c802f3 2245 u16 family = dst_orig->ops->family;
df71837d 2246 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2247 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2248
80c802f3
TT		 2249 dst = NULL;
2250 xdst = NULL;
2251 route = NULL;
4e81bb83 2252
bd5eb35f 2253 sk = sk_const_to_full_sk(sk);
f7944fb1 2254 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3
TT		 2255 num_pols = 1;
2256 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2257 err = xfrm_expand_policies(fl, family, pols,
2258 &num_pols, &num_xfrms);
2259 if (err < 0)
75b8c133 2260 goto dropdst;
80c802f3
TT		 2261
2262 if (num_pols) {
2263 if (num_xfrms <= 0) {
2264 drop_pols = num_pols;
2265 goto no_transform;
2266 }
2267
2268 xdst = xfrm_resolve_and_create_bundle(
2269 pols, num_pols, fl,
2270 family, dst_orig);
2271 if (IS_ERR(xdst)) {
2272 xfrm_pols_put(pols, num_pols);
2273 err = PTR_ERR(xdst);
2274 goto dropdst;
d809ec89
TT		 2275 } else if (xdst == NULL) {
2276 num_xfrms = 0;
2277 drop_pols = num_pols;
2278 goto no_transform;
80c802f3
TT		 2279 }
2280
b7eea454
SK		 2281 dst_hold(&xdst->u.dst);
2282 xdst->u.dst.flags |= DST_NOCACHE;
80c802f3 2283 route = xdst->route;
0aa64774 2284 }
3bccfbc7 2285 }
1da177e4 2286
80c802f3 2287 if (xdst == NULL) {
b8c203b2
SK		 2288 struct xfrm_flo xflo;
2289
2290 xflo.dst_orig = dst_orig;
2291 xflo.flags = flags;
2292
1da177e4 2293 /* To accelerate a bit... */
2518c7c2 2294 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2295 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2296 goto nopol;
1da177e4 2297
80c802f3 2298 flo = flow_cache_lookup(net, fl, family, dir,
b8c203b2 2299 xfrm_bundle_lookup, &xflo);
80c802f3
TT		 2300 if (flo == NULL)
2301 goto nopol;
fe1a5f03 2302 if (IS_ERR(flo)) {
80c802f3 2303 err = PTR_ERR(flo);
75b8c133 2304 goto dropdst;
d66e37a9 2305 }
80c802f3
TT		 2306 xdst = container_of(flo, struct xfrm_dst, flo);
2307
2308 num_pols = xdst->num_pols;
2309 num_xfrms = xdst->num_xfrms;
3e94c2dc 2310 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2311 route = xdst->route;
2312 }
2313
2314 dst = &xdst->u.dst;
2315 if (route == NULL && num_xfrms > 0) {
2316 /* The only case when xfrm_bundle_lookup() returns a
2317 * bundle with null route, is when the template could
2318 * not be resolved. It means policies are there, but
2319 * bundle could not be created, since we don't yet
2320 * have the xfrm_state's. We need to wait for KM to
2321 * negotiate new SA's or bail out with error.*/
2322 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2323 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 2324 err = -EREMOTE;
2325 goto error;
80c802f3 2326 }
80c802f3 2327
5b8ef341 2328 err = -EAGAIN;
80c802f3
TT		 2329
2330 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2331 goto error;
1da177e4
LT		 2332 }
2333
80c802f3
TT		 2334no_transform:
2335 if (num_pols == 0)
8b7817f3 2336 goto nopol;
1da177e4 2337
80c802f3
TT		 2338 if ((flags & XFRM_LOOKUP_ICMP) &&
2339 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2340 err = -ENOENT;
8b7817f3 2341 goto error;
80c802f3 2342 }
8b7817f3 2343
80c802f3
TT		 2344 for (i = 0; i < num_pols; i++)
2345 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2346
80c802f3 2347 if (num_xfrms < 0) {
1da177e4 2348 /* Prohibit the flow */
59c9940e 2349 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2350 err = -EPERM;
2351 goto error;
80c802f3
TT		 2352 } else if (num_xfrms > 0) {
2353 /* Flow transformed */
80c802f3
TT		 2354 dst_release(dst_orig);
2355 } else {
2356 /* Flow passes untransformed */
2357 dst_release(dst);
452edd59 2358 dst = dst_orig;
1da177e4 2359 }
80c802f3
TT		 2360ok:
2361 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2362 if (dst && dst->xfrm &&
2363 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2364 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2365 return dst;
1da177e4 2366
80c802f3 2367nopol:
452edd59
DM		 2368 if (!(flags & XFRM_LOOKUP_ICMP)) {
2369 dst = dst_orig;
80c802f3 2370 goto ok;
452edd59 2371 }
80c802f3 2372 err = -ENOENT;
1da177e4 2373error:
80c802f3 2374 dst_release(dst);
75b8c133 2375dropdst:
ac37e251
W		 2376 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2377 dst_release(dst_orig);
80c802f3 2378 xfrm_pols_put(pols, drop_pols);
452edd59 2379 return ERR_PTR(err);
1da177e4
LT		 2380}
2381EXPORT_SYMBOL(xfrm_lookup);
2382
f92ee619
SK		 2383/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2384 * Otherwise we may send out blackholed packets.
2385 */
2386struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2387 const struct flowi *fl,
6f9c9615 2388 const struct sock *sk, int flags)
f92ee619 2389{
b8c203b2 2390 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 2391 flags | XFRM_LOOKUP_QUEUE |
2392 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619
SK		 2393
2394 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2395 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2396
2397 return dst;
2398}
2399EXPORT_SYMBOL(xfrm_lookup_route);
2400
df0ba92a 2401static inline int
8f029de2 2402xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2403{
2404 struct xfrm_state *x;
df0ba92a
MN		 2405
2406 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2407 return 0;
2408 x = skb->sp->xvec[idx];
2409 if (!x->type->reject)
2410 return 0;
1ecafede 2411 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2412}
2413
1da177e4
LT		 2414/* When skb is transformed back to its "native" form, we have to
2415 * check policy restrictions. At the moment we make this in maximally
2416 * stupid way. Shame on me. :-) Of course, connected sockets must
2417 * have policy cached at them.
2418 */
2419
2420static inline int
7db454b9 2421xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2422 unsigned short family)
2423{
2424 if (xfrm_state_kern(x))
928ba416 2425 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2426 return x->id.proto == tmpl->id.proto &&
2427 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2428 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2429 x->props.mode == tmpl->mode &&
c5d18e98 2430 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2431 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2432 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2433 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2434}
2435
df0ba92a
MN		 2436/*
2437 * 0 or more than 0 is returned when validation is succeeded (either bypass
2438 * because of optional transport mode, or next index of the mathced secpath
2439 * state with the template.
2440 * -1 is returned when no matching template is found.
2441 * Otherwise "-2 - errored_index" is returned.
2442 */
1da177e4 2443static inline int
22cccb7e 2444xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2445 unsigned short family)
2446{
2447 int idx = start;
2448
2449 if (tmpl->optional) {
7e49e6de 2450 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2451 return start;
2452 } else
2453 start = -1;
2454 for (; idx < sp->len; idx++) {
dbe5b4aa 2455 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2456 return ++idx;
df0ba92a
MN		 2457 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2458 if (start == -1)
2459 start = -2-idx;
1da177e4 2460 break;
df0ba92a 2461 }
1da177e4
LT		 2462 }
2463 return start;
2464}
2465
d5422efe
HX		 2466int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2467 unsigned int family, int reverse)
1da177e4
LT		 2468{
2469 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2470 int err;
1da177e4
LT		 2471
2472 if (unlikely(afinfo == NULL))
2473 return -EAFNOSUPPORT;
2474
d5422efe 2475 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2476 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
1da177e4 2477 xfrm_policy_put_afinfo(afinfo);
e0d1caa7 2478 return err;
1da177e4 2479}
d5422efe 2480EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2481
9a7386ec 2482static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2483{
2484 for (; k < sp->len; k++) {
df0ba92a 2485 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2486 *idxp = k;
1da177e4 2487 return 1;
df0ba92a 2488 }
1da177e4
LT		 2489 }
2490
2491 return 0;
2492}
2493
a716c119 2494int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2495 unsigned short family)
2496{
f6e1e25d 2497 struct net *net = dev_net(skb->dev);
1da177e4 2498 struct xfrm_policy *pol;
4e81bb83
MN		 2499 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2500 int npols = 0;
2501 int xfrm_nr;
2502 int pi;
d5422efe 2503 int reverse;
1da177e4 2504 struct flowi fl;
d5422efe 2505 u8 fl_dir;
df0ba92a 2506 int xerr_idx = -1;
1da177e4 2507
d5422efe
HX		 2508 reverse = dir & ~XFRM_POLICY_MASK;
2509 dir &= XFRM_POLICY_MASK;
2510 fl_dir = policy_to_flow_dir(dir);
2511
0aa64774 2512 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2513 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2514 return 0;
0aa64774
MN		 2515 }
2516
eb9c7ebe 2517 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2518
2519 /* First, check used SA against their selectors. */
2520 if (skb->sp) {
2521 int i;
2522
9b7a787d 2523 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2524 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2525 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2526 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2527 return 0;
0aa64774 2528 }
1da177e4
LT		 2529 }
2530 }
2531
2532 pol = NULL;
bd5eb35f 2533 sk = sk_to_full_sk(sk);
3bccfbc7 2534 if (sk && sk->sk_policy[dir]) {
e0d1caa7 2535 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
0aa64774 2536 if (IS_ERR(pol)) {
59c9940e 2537 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2538 return 0;
0aa64774 2539 }
3bccfbc7 2540 }
1da177e4 2541
fe1a5f03
TT		 2542 if (!pol) {
2543 struct flow_cache_object *flo;
2544
2545 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2546 xfrm_policy_lookup, NULL);
2547 if (IS_ERR_OR_NULL(flo))
2548 pol = ERR_CAST(flo);
2549 else
2550 pol = container_of(flo, struct xfrm_policy, flo);
2551 }
1da177e4 2552
0aa64774 2553 if (IS_ERR(pol)) {
59c9940e 2554 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2555 return 0;
0aa64774 2556 }
134b0fc5 2557
df0ba92a 2558 if (!pol) {
d1d9facf 2559 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2560 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2561 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2562 return 0;
2563 }
2564 return 1;
2565 }
1da177e4 2566
9d729f72 2567 pol->curlft.use_time = get_seconds();
1da177e4 2568
4e81bb83 2569 pols[0] = pol;
02d0892f 2570 npols++;
4e81bb83
MN		 2571#ifdef CONFIG_XFRM_SUB_POLICY
2572 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2573 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2574 &fl, family,
2575 XFRM_POLICY_IN);
2576 if (pols[1]) {
0aa64774 2577 if (IS_ERR(pols[1])) {
59c9940e 2578 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2579 return 0;
0aa64774 2580 }
9d729f72 2581 pols[1]->curlft.use_time = get_seconds();
02d0892f 2582 npols++;
4e81bb83
MN		 2583 }
2584 }
2585#endif
2586
1da177e4
LT		 2587 if (pol->action == XFRM_POLICY_ALLOW) {
2588 struct sec_path *sp;
2589 static struct sec_path dummy;
4e81bb83 2590 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2591 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2592 struct xfrm_tmpl **tpp = tp;
2593 int ti = 0;
1da177e4
LT		 2594 int i, k;
2595
2596 if ((sp = skb->sp) == NULL)
2597 sp = &dummy;
2598
4e81bb83
MN		 2599 for (pi = 0; pi < npols; pi++) {
2600 if (pols[pi] != pol &&
0aa64774 2601 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2602 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2603 goto reject;
0aa64774
MN		 2604 }
2605 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2606 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2607 goto reject_error;
0aa64774 2608 }
4e81bb83
MN		 2609 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2610 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2611 }
2612 xfrm_nr = ti;
41a49cc3 2613 if (npols > 1) {
283bc9f3 2614 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2615 tpp = stp;
2616 }
4e81bb83 2617
1da177e4
LT		 2618 /* For each tunnel xfrm, find the first matching tmpl.
2619 * For each tmpl before that, find corresponding xfrm.
2620 * Order is _important_. Later we will implement
2621 * some barriers, but at the moment barriers
2622 * are implied between each two transformations.
2623 */
4e81bb83
MN		 2624 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2625 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2626 if (k < 0) {
d1d9facf
JM		 2627 if (k < -1)
2628 /* "-2 - errored_index" returned */
2629 xerr_idx = -(2+k);
59c9940e 2630 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2631 goto reject;
df0ba92a 2632 }
1da177e4
LT		 2633 }
2634
0aa64774 2635 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2636 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2637 goto reject;
0aa64774 2638 }
1da177e4 2639
4e81bb83 2640 xfrm_pols_put(pols, npols);
1da177e4
LT		 2641 return 1;
2642 }
59c9940e 2643 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2644
2645reject:
df0ba92a 2646 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2647reject_error:
2648 xfrm_pols_put(pols, npols);
1da177e4
LT		 2649 return 0;
2650}
2651EXPORT_SYMBOL(__xfrm_policy_check);
2652
2653int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2654{
99a66657 2655 struct net *net = dev_net(skb->dev);
1da177e4 2656 struct flowi fl;
adf30907 2657 struct dst_entry *dst;
73137147 2658 int res = 1;
1da177e4 2659
0aa64774 2660 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2661 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2662 return 0;
0aa64774 2663 }
1da177e4 2664
fafeeb6c 2665 skb_dst_force(skb);
adf30907 2666
b8c203b2 2667 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 2668 if (IS_ERR(dst)) {
73137147 2669 res = 0;
452edd59
DM		 2670 dst = NULL;
2671 }
adf30907
ED		 2672 skb_dst_set(skb, dst);
2673 return res;
1da177e4
LT		 2674}
2675EXPORT_SYMBOL(__xfrm_route_forward);
2676
d49c73c7
DM		 2677/* Optimize later using cookies and generation ids. */
2678
1da177e4
LT		 2679static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2680{
d49c73c7 2681 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2682 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2683 * get validated by dst_ops->check on every use. We do this
2684 * because when a normal route referenced by an XFRM dst is
2685 * obsoleted we do not go looking around for all parent
2686 * referencing XFRM dsts so that we can invalidate them. It
2687 * is just too much work. Instead we make the checks here on
2688 * every use. For example:
d49c73c7
DM		 2689 *
2690 * XFRM dst A --> IPv4 dst X
2691 *
2692 * X is the "xdst->route" of A (X is also the "dst->path" of A
2693 * in this example). If X is marked obsolete, "A" will not
2694 * notice. That's what we are validating here via the
2695 * stale_bundle() check.
2696 *
2697 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2698 * dst which causes it's ->obsolete field to be set to
2699 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2700 * this, we want to force a new route lookup.
399c180a 2701 */
d49c73c7
DM		 2702 if (dst->obsolete < 0 && !stale_bundle(dst))
2703 return dst;
2704
1da177e4
LT		 2705 return NULL;
2706}
2707
2708static int stale_bundle(struct dst_entry *dst)
2709{
12fdb4d3 2710 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2711}
2712
aabc9761 2713void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2714{
1da177e4 2715 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2716 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2717 dev_hold(dst->dev);
1da177e4
LT		 2718 dev_put(dev);
2719 }
2720}
aabc9761 2721EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2722
2723static void xfrm_link_failure(struct sk_buff *skb)
2724{
2725 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2726}
2727
2728static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2729{
2730 if (dst) {
2731 if (dst->obsolete) {
2732 dst_release(dst);
2733 dst = NULL;
2734 }
2735 }
2736 return dst;
2737}
2738
e4c17216 2739void xfrm_garbage_collect(struct net *net)
c0ed1c14 2740{
ca925cf1 2741 flow_cache_flush(net);
c0ed1c14 2742}
e4c17216 2743EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14
SK		 2744
2745static void xfrm_garbage_collect_deferred(struct net *net)
2746{
ca925cf1 2747 flow_cache_flush_deferred(net);
c0ed1c14
SK		 2748}
2749
25ee3286 2750static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2751{
2752 do {
2753 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2754 u32 pmtu, route_mtu_cached;
2755
2756 pmtu = dst_mtu(dst->child);
2757 xdst->child_mtu_cached = pmtu;
2758
2759 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2760
2761 route_mtu_cached = dst_mtu(xdst->route);
2762 xdst->route_mtu_cached = route_mtu_cached;
2763
2764 if (pmtu > route_mtu_cached)
2765 pmtu = route_mtu_cached;
2766
defb3519 2767 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2768 } while ((dst = dst->next));
2769}
2770
1da177e4
LT		 2771/* Check that the bundle accepts the flow and its components are
2772 * still valid.
2773 */
2774
12fdb4d3 2775static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2776{
2777 struct dst_entry *dst = &first->u.dst;
2778 struct xfrm_dst *last;
2779 u32 mtu;
2780
92d63dec 2781 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2782 (dst->dev && !netif_running(dst->dev)))
2783 return 0;
2784
a0073fe1
SK		 2785 if (dst->flags & DST_XFRM_QUEUE)
2786 return 1;
2787
1da177e4
LT		 2788 last = NULL;
2789
2790 do {
2791 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2792
1da177e4
LT		 2793 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2794 return 0;
80c802f3
TT		 2795 if (xdst->xfrm_genid != dst->xfrm->genid)
2796 return 0;
b1312c89
TT		 2797 if (xdst->num_pols > 0 &&
2798 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2799 return 0;
e53820de 2800
1da177e4
LT		 2801 mtu = dst_mtu(dst->child);
2802 if (xdst->child_mtu_cached != mtu) {
2803 last = xdst;
2804 xdst->child_mtu_cached = mtu;
2805 }
2806
92d63dec 2807 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2808 return 0;
2809 mtu = dst_mtu(xdst->route);
2810 if (xdst->route_mtu_cached != mtu) {
2811 last = xdst;
2812 xdst->route_mtu_cached = mtu;
2813 }
2814
2815 dst = dst->child;
2816 } while (dst->xfrm);
2817
2818 if (likely(!last))
2819 return 1;
2820
2821 mtu = last->child_mtu_cached;
2822 for (;;) {
2823 dst = &last->u.dst;
2824
2825 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2826 if (mtu > last->route_mtu_cached)
2827 mtu = last->route_mtu_cached;
defb3519 2828 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2829
2830 if (last == first)
2831 break;
2832
bd0bf076 2833 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2834 last->child_mtu_cached = mtu;
2835 }
2836
2837 return 1;
2838}
2839
0dbaee3b
DM		 2840static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2841{
2842 return dst_metric_advmss(dst->path);
2843}
2844
ebb762f2 2845static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2846{
618f9bc7
SK		 2847 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2848
2849 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2850}
2851
f894cbf8
DM		 2852static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2853 struct sk_buff *skb,
2854 const void *daddr)
d3aaeb38 2855{
f894cbf8 2856 return dst->path->ops->neigh_lookup(dst, skb, daddr);
d3aaeb38
DM		 2857}
2858
111757e7
JA		 2859static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2860{
2861 const struct dst_entry *path = dst->path;
2862
2863 for (; dst != path; dst = dst->child) {
2864 const struct xfrm_state *xfrm = dst->xfrm;
2865
2866 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2867 continue;
2868 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2869 daddr = xfrm->coaddr;
2870 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2871 daddr = &xfrm->id.daddr;
2872 }
2873 path->ops->confirm_neigh(path, daddr);
2874}
2875
1da177e4
LT		 2876int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2877{
2878 int err = 0;
2879 if (unlikely(afinfo == NULL))
2880 return -EINVAL;
2881 if (unlikely(afinfo->family >= NPROTO))
2882 return -EAFNOSUPPORT;
ef8531b6 2883 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4 2884 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
f31e8d4f 2885 err = -EEXIST;
1da177e4
LT		 2886 else {
2887 struct dst_ops *dst_ops = afinfo->dst_ops;
2888 if (likely(dst_ops->kmem_cachep == NULL))
2889 dst_ops->kmem_cachep = xfrm_dst_cache;
2890 if (likely(dst_ops->check == NULL))
2891 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2892 if (likely(dst_ops->default_advmss == NULL))
2893 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2894 if (likely(dst_ops->mtu == NULL))
2895 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2896 if (likely(dst_ops->negative_advice == NULL))
2897 dst_ops->negative_advice = xfrm_negative_advice;
2898 if (likely(dst_ops->link_failure == NULL))
2899 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2900 if (likely(dst_ops->neigh_lookup == NULL))
2901 dst_ops->neigh_lookup = xfrm_neigh_lookup;
111757e7
JA		 2902 if (likely(!dst_ops->confirm_neigh))
2903 dst_ops->confirm_neigh = xfrm_confirm_neigh;
1da177e4 2904 if (likely(afinfo->garbage_collect == NULL))
c0ed1c14 2905 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
418a99ac 2906 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
1da177e4 2907 }
ef8531b6 2908 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 2909
1da177e4
LT		 2910 return err;
2911}
2912EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2913
2914int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2915{
2916 int err = 0;
2917 if (unlikely(afinfo == NULL))
2918 return -EINVAL;
2919 if (unlikely(afinfo->family >= NPROTO))
2920 return -EAFNOSUPPORT;
ef8531b6 2921 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4
LT		 2922 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2923 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2924 err = -EINVAL;
ef8531b6
ED		 2925 else
2926 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2927 NULL);
2928 }
2929 spin_unlock(&xfrm_policy_afinfo_lock);
2930 if (!err) {
2931 struct dst_ops *dst_ops = afinfo->dst_ops;
2932
2933 synchronize_rcu();
2934
2935 dst_ops->kmem_cachep = NULL;
2936 dst_ops->check = NULL;
2937 dst_ops->negative_advice = NULL;
2938 dst_ops->link_failure = NULL;
2939 afinfo->garbage_collect = NULL;
1da177e4 2940 }
1da177e4
LT		 2941 return err;
2942}
2943EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2944
1da177e4
LT		 2945static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2946{
351638e7 2947 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
e9dc8653 2948
1da177e4
LT		 2949 switch (event) {
2950 case NETDEV_DOWN:
c0ed1c14 2951 xfrm_garbage_collect(dev_net(dev));
1da177e4
LT		 2952 }
2953 return NOTIFY_DONE;
2954}
2955
2956static struct notifier_block xfrm_dev_notifier = {
d5917a35 2957 .notifier_call = xfrm_dev_event,
1da177e4
LT		 2958};
2959
558f82ef 2960#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2961static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2962{
c68cd1a0 2963 int rv;
698365fa
WC		 2964 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2965 if (!net->mib.xfrm_statistics)
558f82ef 2966 return -ENOMEM;
c68cd1a0
AD		 2967 rv = xfrm_proc_init(net);
2968 if (rv < 0)
698365fa 2969 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 2970 return rv;
558f82ef 2971}
59c9940e
AD		 2972
2973static void xfrm_statistics_fini(struct net *net)
2974{
c68cd1a0 2975 xfrm_proc_fini(net);
698365fa 2976 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 2977}
2978#else
2979static int __net_init xfrm_statistics_init(struct net *net)
2980{
2981 return 0;
2982}
2983
2984static void xfrm_statistics_fini(struct net *net)
2985{
2986}
558f82ef
MN		 2987#endif
2988
d62ddc21 2989static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2990{
2518c7c2
DM		 2991 unsigned int hmask, sz;
2992 int dir;
2993
d62ddc21
AD		 2994 if (net_eq(net, &init_net))
2995 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2996 sizeof(struct xfrm_dst),
e5d679f3 2997 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2998 NULL);
1da177e4 2999
2518c7c2
DM		 3000 hmask = 8 - 1;
3001 sz = (hmask+1) * sizeof(struct hlist_head);
3002
93b851c1
AD		 3003 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
3004 if (!net->xfrm.policy_byidx)
3005 goto out_byidx;
8100bea7 3006 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 3007
53c2e285 3008 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 3009 struct xfrm_policy_hash *htab;
3010
dc2caba7 3011 net->xfrm.policy_count[dir] = 0;
53c2e285 3012 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 3013 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 3014
a35f6c5d 3015 htab = &net->xfrm.policy_bydst[dir];
44e36b42 3016 htab->table = xfrm_hash_alloc(sz);
2518c7c2 3017 if (!htab->table)
a35f6c5d
AD		 3018 goto out_bydst;
3019 htab->hmask = hmask;
b58555f1
CG		 3020 htab->dbits4 = 32;
3021 htab->sbits4 = 32;
3022 htab->dbits6 = 128;
3023 htab->sbits6 = 128;
2518c7c2 3024 }
880a6fab
CG		 3025 net->xfrm.policy_hthresh.lbits4 = 32;
3026 net->xfrm.policy_hthresh.rbits4 = 32;
3027 net->xfrm.policy_hthresh.lbits6 = 128;
3028 net->xfrm.policy_hthresh.rbits6 = 128;
3029
3030 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 3031
adfcf0b2 3032 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 3033 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 3034 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21
AD		 3035 if (net_eq(net, &init_net))
3036 register_netdevice_notifier(&xfrm_dev_notifier);
3037 return 0;
93b851c1 3038
a35f6c5d
AD		 3039out_bydst:
3040 for (dir--; dir >= 0; dir--) {
3041 struct xfrm_policy_hash *htab;
3042
3043 htab = &net->xfrm.policy_bydst[dir];
3044 xfrm_hash_free(htab->table, sz);
3045 }
3046 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 3047out_byidx:
3048 return -ENOMEM;
d62ddc21
AD		 3049}
3050
3051static void xfrm_policy_fini(struct net *net)
3052{
93b851c1 3053 unsigned int sz;
8b18f8ea 3054 int dir;
93b851c1 3055
7c2776ee
AD		 3056 flush_work(&net->xfrm.policy_hash_work);
3057#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 3058 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 3059#endif
2e71029e 3060 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 3061
adfcf0b2 3062 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 3063
53c2e285 3064 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 3065 struct xfrm_policy_hash *htab;
3066
8b18f8ea 3067 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 3068
3069 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 3070 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 3071 WARN_ON(!hlist_empty(htab->table));
3072 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 3073 }
3074
8100bea7 3075 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 3076 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3077 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 3078}
3079
d62ddc21
AD		 3080static int __net_init xfrm_net_init(struct net *net)
3081{
3082 int rv;
3083
1e8ede7c
FW		 3084 /* Initialize the per-net locks here */
3085 spin_lock_init(&net->xfrm.xfrm_state_lock);
3086 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3087 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3088
59c9940e
AD		 3089 rv = xfrm_statistics_init(net);
3090 if (rv < 0)
3091 goto out_statistics;
d62ddc21
AD		 3092 rv = xfrm_state_init(net);
3093 if (rv < 0)
3094 goto out_state;
3095 rv = xfrm_policy_init(net);
3096 if (rv < 0)
3097 goto out_policy;
b27aeadb
AD		 3098 rv = xfrm_sysctl_init(net);
3099 if (rv < 0)
3100 goto out_sysctl;
4a93f509
SK		 3101 rv = flow_cache_init(net);
3102 if (rv < 0)
3103 goto out;
283bc9f3 3104
d62ddc21
AD		 3105 return 0;
3106
4a93f509
SK		 3107out:
3108 xfrm_sysctl_fini(net);
b27aeadb
AD		 3109out_sysctl:
3110 xfrm_policy_fini(net);
d62ddc21
AD		 3111out_policy:
3112 xfrm_state_fini(net);
3113out_state:
59c9940e
AD		 3114 xfrm_statistics_fini(net);
3115out_statistics:
d62ddc21
AD		 3116 return rv;
3117}
3118
3119static void __net_exit xfrm_net_exit(struct net *net)
3120{
4a93f509 3121 flow_cache_fini(net);
b27aeadb 3122 xfrm_sysctl_fini(net);
d62ddc21
AD		 3123 xfrm_policy_fini(net);
3124 xfrm_state_fini(net);
59c9940e 3125 xfrm_statistics_fini(net);
d62ddc21
AD		 3126}
3127
3128static struct pernet_operations __net_initdata xfrm_net_ops = {
3129 .init = xfrm_net_init,
3130 .exit = xfrm_net_exit,
3131};
3132
1da177e4
LT		 3133void __init xfrm_init(void)
3134{
a4fc1bfc 3135 flow_cache_hp_init();
d62ddc21 3136 register_pernet_subsys(&xfrm_net_ops);
30846090 3137 seqcount_init(&xfrm_policy_hash_generation);
1da177e4
LT		 3138 xfrm_input_init();
3139}
3140
ab5f5e8b 3141#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 3142static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3143 struct audit_buffer *audit_buf)
ab5f5e8b 3144{
875179fa
PM		 3145 struct xfrm_sec_ctx *ctx = xp->security;
3146 struct xfrm_selector *sel = &xp->selector;
3147
3148 if (ctx)
ab5f5e8b 3149 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 3150 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 3151
9b7a787d 3152 switch (sel->family) {
ab5f5e8b 3153 case AF_INET:
21454aaa 3154 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 3155 if (sel->prefixlen_s != 32)
3156 audit_log_format(audit_buf, " src_prefixlen=%d",
3157 sel->prefixlen_s);
21454aaa 3158 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 3159 if (sel->prefixlen_d != 32)
3160 audit_log_format(audit_buf, " dst_prefixlen=%d",
3161 sel->prefixlen_d);
ab5f5e8b
JL		 3162 break;
3163 case AF_INET6:
5b095d98 3164 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3165 if (sel->prefixlen_s != 128)
3166 audit_log_format(audit_buf, " src_prefixlen=%d",
3167 sel->prefixlen_s);
5b095d98 3168 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3169 if (sel->prefixlen_d != 128)
3170 audit_log_format(audit_buf, " dst_prefixlen=%d",
3171 sel->prefixlen_d);
ab5f5e8b
JL		 3172 break;
3173 }
3174}
3175
2e71029e 3176void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 3177{
3178 struct audit_buffer *audit_buf;
ab5f5e8b 3179
afeb14b4 3180 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3181 if (audit_buf == NULL)
3182 return;
2e71029e 3183 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3184 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3185 xfrm_audit_common_policyinfo(xp, audit_buf);
3186 audit_log_end(audit_buf);
3187}
3188EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3189
68277acc 3190void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 3191 bool task_valid)
ab5f5e8b
JL		 3192{
3193 struct audit_buffer *audit_buf;
ab5f5e8b 3194
afeb14b4 3195 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3196 if (audit_buf == NULL)
3197 return;
2e71029e 3198 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 3199 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3200 xfrm_audit_common_policyinfo(xp, audit_buf);
3201 audit_log_end(audit_buf);
3202}
3203EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3204#endif
3205
80c9abaa 3206#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3207static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3208 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3209{
3210 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3211 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3212 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3213 sel_cmp->family) &&
3214 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3215 sel_cmp->family) &&
80c9abaa
SS		 3216 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3217 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3218 return true;
80c9abaa
SS		 3219 }
3220 } else {
3221 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3222 return true;
80c9abaa
SS		 3223 }
3224 }
bc9b35ad 3225 return false;
80c9abaa
SS		 3226}
3227
3e94c2dc
WC		 3228static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3229 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3230{
3231 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3232 struct hlist_head *chain;
3233 u32 priority = ~0U;
3234
9d0380df 3235 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 3236 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3237 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3238 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3239 pol->type == type) {
3240 ret = pol;
3241 priority = ret->priority;
3242 break;
3243 }
3244 }
8d549c4f 3245 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3246 hlist_for_each_entry(pol, chain, bydst) {
8faf491e
LR		 3247 if ((pol->priority >= priority) && ret)
3248 break;
3249
80c9abaa 3250 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 3251 pol->type == type) {
80c9abaa
SS		 3252 ret = pol;
3253 break;
3254 }
3255 }
3256
586f2eb4 3257 xfrm_pol_hold(ret);
80c9abaa 3258
9d0380df 3259 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3260
3261 return ret;
3262}
3263
dd701754 3264static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3265{
3266 int match = 0;
3267
3268 if (t->mode == m->mode && t->id.proto == m->proto &&
3269 (m->reqid == 0 || t->reqid == m->reqid)) {
3270 switch (t->mode) {
3271 case XFRM_MODE_TUNNEL:
3272 case XFRM_MODE_BEET:
70e94e66
YH		 3273 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3274 m->old_family) &&
3275 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3276 m->old_family)) {
80c9abaa
SS		 3277 match = 1;
3278 }
3279 break;
3280 case XFRM_MODE_TRANSPORT:
3281 /* in case of transport mode, template does not store
3282 any IP addresses, hence we just compare mode and
3283 protocol */
3284 match = 1;
3285 break;
3286 default:
3287 break;
3288 }
3289 }
3290 return match;
3291}
3292
3293/* update endpoint address(es) of template(s) */
3294static int xfrm_policy_migrate(struct xfrm_policy *pol,
3295 struct xfrm_migrate *m, int num_migrate)
3296{
3297 struct xfrm_migrate *mp;
80c9abaa
SS		 3298 int i, j, n = 0;
3299
3300 write_lock_bh(&pol->lock);
12a169e7 3301 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3302 /* target policy has been deleted */
3303 write_unlock_bh(&pol->lock);
3304 return -ENOENT;
3305 }
3306
3307 for (i = 0; i < pol->xfrm_nr; i++) {
3308 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3309 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3310 continue;
3311 n++;
1bfcb10f
HX		 3312 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3313 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3314 continue;
3315 /* update endpoints */
3316 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3317 sizeof(pol->xfrm_vec[i].id.daddr));
3318 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3319 sizeof(pol->xfrm_vec[i].saddr));
3320 pol->xfrm_vec[i].encap_family = mp->new_family;
3321 /* flush bundles */
80c802f3 3322 atomic_inc(&pol->genid);
80c9abaa
SS		 3323 }
3324 }
3325
3326 write_unlock_bh(&pol->lock);
3327
3328 if (!n)
3329 return -ENODATA;
3330
3331 return 0;
3332}
3333
dd701754 3334static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3335{
3336 int i, j;
3337
3338 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3339 return -EINVAL;
3340
3341 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3342 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3343 m[i].old_family) &&
3344 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3345 m[i].old_family))
80c9abaa
SS		 3346 return -EINVAL;
3347 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3348 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3349 return -EINVAL;
3350
3351 /* check if there is any duplicated entry */
3352 for (j = i + 1; j < num_migrate; j++) {
3353 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3354 sizeof(m[i].old_daddr)) &&
3355 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3356 sizeof(m[i].old_saddr)) &&
3357 m[i].proto == m[j].proto &&
3358 m[i].mode == m[j].mode &&
3359 m[i].reqid == m[j].reqid &&
3360 m[i].old_family == m[j].old_family)
3361 return -EINVAL;
3362 }
3363 }
3364
3365 return 0;
3366}
3367
b4b7c0b3 3368int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3369 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3370 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3371{
3372 int i, err, nx_cur = 0, nx_new = 0;
3373 struct xfrm_policy *pol = NULL;
3374 struct xfrm_state *x, *xc;
3375 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3376 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3377 struct xfrm_migrate *mp;
3378
3379 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3380 goto out;
3381
3382 /* Stage 1 - find policy */
8d549c4f 3383 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3384 err = -ENOENT;
3385 goto out;
3386 }
3387
3388 /* Stage 2 - find and update state(s) */
3389 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3390 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3391 x_cur[nx_cur] = x;
3392 nx_cur++;
3393 if ((xc = xfrm_state_migrate(x, mp))) {
3394 x_new[nx_new] = xc;
3395 nx_new++;
3396 } else {
3397 err = -ENODATA;
3398 goto restore_state;
3399 }
3400 }
3401 }
3402
3403 /* Stage 3 - update policy */
3404 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3405 goto restore_state;
3406
3407 /* Stage 4 - delete old state(s) */
3408 if (nx_cur) {
3409 xfrm_states_put(x_cur, nx_cur);
3410 xfrm_states_delete(x_cur, nx_cur);
3411 }
3412
3413 /* Stage 5 - announce */
13c1d189 3414 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3415
3416 xfrm_pol_put(pol);
3417
3418 return 0;
3419out:
3420 return err;
3421
3422restore_state:
3423 if (pol)
3424 xfrm_pol_put(pol);
3425 if (nx_cur)
3426 xfrm_states_put(x_cur, nx_cur);
3427 if (nx_new)
3428 xfrm_states_delete(x_new, nx_new);
3429
3430 return err;
3431}
e610e679 3432EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3433#endif
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