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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_policy.c
CommitLineData
a716c119 1/*
1da177e4
LT		 2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
df71837d 13 *
1da177e4
LT		 14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT		 17#include <linux/slab.h>
18#include <linux/kmod.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/workqueue.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
6ce74ec7 29#include <net/flow.h>
1da177e4
LT		 30#include <net/xfrm.h>
31#include <net/ip.h>
558f82ef
MN		 32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
1da177e4 35
44e36b42
DM		 36#include "xfrm_hash.h"
37
a0073fe1
SK		 38#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
80c802f3 42static struct dst_entry *xfrm_policy_sk_bundles;
1da177e4 43
418a99ac
PJ		 44static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
45static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
46 __read_mostly;
1da177e4 47
e18b890b 48static struct kmem_cache *xfrm_dst_cache __read_mostly;
1da177e4 49
25ee3286 50static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 51static int stale_bundle(struct dst_entry *dst);
12fdb4d3 52static int xfrm_bundle_ok(struct xfrm_dst *xdst);
a0073fe1 53static void xfrm_policy_queue_process(unsigned long arg);
1da177e4 54
29fa0b30
WY		 55static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
56 int dir);
57
bc9b35ad 58static inline bool
200ce96e 59__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 60{
7e1dc7b6
DM		 61 const struct flowi4 *fl4 = &fl->u.ip4;
62
26bff940
AD		 63 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
64 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 65 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
66 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
67 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
68 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 69}
70
bc9b35ad 71static inline bool
200ce96e 72__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 73{
7e1dc7b6
DM		 74 const struct flowi6 *fl6 = &fl->u.ip6;
75
76 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
77 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
78 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
79 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
80 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
81 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 82}
83
bc9b35ad
DM		 84bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
85 unsigned short family)
77681021
AM		 86{
87 switch (family) {
88 case AF_INET:
89 return __xfrm4_selector_match(sel, fl);
90 case AF_INET6:
91 return __xfrm6_selector_match(sel, fl);
92 }
bc9b35ad 93 return false;
77681021
AM		 94}
95
ef8531b6
ED		 96static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
97{
98 struct xfrm_policy_afinfo *afinfo;
99
100 if (unlikely(family >= NPROTO))
101 return NULL;
102 rcu_read_lock();
103 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
104 if (unlikely(!afinfo))
105 rcu_read_unlock();
106 return afinfo;
107}
108
109static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
110{
111 rcu_read_unlock();
112}
113
c5b3cf46 114static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
6418c4e0
DM		 115 const xfrm_address_t *saddr,
116 const xfrm_address_t *daddr,
9bb182a7
YH		 117 int family)
118{
119 struct xfrm_policy_afinfo *afinfo;
120 struct dst_entry *dst;
121
122 afinfo = xfrm_policy_get_afinfo(family);
123 if (unlikely(afinfo == NULL))
124 return ERR_PTR(-EAFNOSUPPORT);
125
c5b3cf46 126 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
9bb182a7
YH		 127
128 xfrm_policy_put_afinfo(afinfo);
129
130 return dst;
131}
132
25ee3286 133static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
9bb182a7
YH		 134 xfrm_address_t *prev_saddr,
135 xfrm_address_t *prev_daddr,
25ee3286 136 int family)
1da177e4 137{
c5b3cf46 138 struct net *net = xs_net(x);
66cdb3ca
HX		 139 xfrm_address_t *saddr = &x->props.saddr;
140 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 141 struct dst_entry *dst;
142
9bb182a7 143 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 144 saddr = x->coaddr;
9bb182a7
YH		 145 daddr = prev_daddr;
146 }
147 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
148 saddr = prev_saddr;
66cdb3ca 149 daddr = x->coaddr;
9bb182a7 150 }
1da177e4 151
c5b3cf46 152 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
9bb182a7
YH		 153
154 if (!IS_ERR(dst)) {
155 if (prev_saddr != saddr)
156 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
157 if (prev_daddr != daddr)
158 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
159 }
1da177e4 160
66cdb3ca 161 return dst;
1da177e4 162}
1da177e4 163
1da177e4
LT		 164static inline unsigned long make_jiffies(long secs)
165{
166 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
167 return MAX_SCHEDULE_TIMEOUT-1;
168 else
a716c119 169 return secs*HZ;
1da177e4
LT		 170}
171
172static void xfrm_policy_timer(unsigned long data)
173{
3e94c2dc 174 struct xfrm_policy *xp = (struct xfrm_policy *)data;
9d729f72 175 unsigned long now = get_seconds();
1da177e4
LT		 176 long next = LONG_MAX;
177 int warn = 0;
178 int dir;
179
180 read_lock(&xp->lock);
181
ea2dea9d 182 if (unlikely(xp->walk.dead))
1da177e4
LT		 183 goto out;
184
77d8d7a6 185 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 186
187 if (xp->lft.hard_add_expires_seconds) {
188 long tmo = xp->lft.hard_add_expires_seconds +
189 xp->curlft.add_time - now;
190 if (tmo <= 0)
191 goto expired;
192 if (tmo < next)
193 next = tmo;
194 }
195 if (xp->lft.hard_use_expires_seconds) {
196 long tmo = xp->lft.hard_use_expires_seconds +
197 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
198 if (tmo <= 0)
199 goto expired;
200 if (tmo < next)
201 next = tmo;
202 }
203 if (xp->lft.soft_add_expires_seconds) {
204 long tmo = xp->lft.soft_add_expires_seconds +
205 xp->curlft.add_time - now;
206 if (tmo <= 0) {
207 warn = 1;
208 tmo = XFRM_KM_TIMEOUT;
209 }
210 if (tmo < next)
211 next = tmo;
212 }
213 if (xp->lft.soft_use_expires_seconds) {
214 long tmo = xp->lft.soft_use_expires_seconds +
215 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
216 if (tmo <= 0) {
217 warn = 1;
218 tmo = XFRM_KM_TIMEOUT;
219 }
220 if (tmo < next)
221 next = tmo;
222 }
223
224 if (warn)
6c5c8ca7 225 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT		 226 if (next != LONG_MAX &&
227 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
228 xfrm_pol_hold(xp);
229
230out:
231 read_unlock(&xp->lock);
232 xfrm_pol_put(xp);
233 return;
234
235expired:
236 read_unlock(&xp->lock);
4666faab 237 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 238 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 239 xfrm_pol_put(xp);
240}
241
fe1a5f03
TT		 242static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
243{
244 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
245
246 if (unlikely(pol->walk.dead))
247 flo = NULL;
248 else
249 xfrm_pol_hold(pol);
250
251 return flo;
252}
253
254static int xfrm_policy_flo_check(struct flow_cache_object *flo)
255{
256 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
257
258 return !pol->walk.dead;
259}
260
261static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
262{
263 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
264}
265
266static const struct flow_cache_ops xfrm_policy_fc_ops = {
267 .get = xfrm_policy_flo_get,
268 .check = xfrm_policy_flo_check,
269 .delete = xfrm_policy_flo_delete,
270};
1da177e4
LT		 271
272/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
273 * SPD calls.
274 */
275
0331b1f3 276struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 277{
278 struct xfrm_policy *policy;
279
0da974f4 280 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 281
282 if (policy) {
0331b1f3 283 write_pnet(&policy->xp_net, net);
12a169e7 284 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM		 285 INIT_HLIST_NODE(&policy->bydst);
286 INIT_HLIST_NODE(&policy->byidx);
1da177e4 287 rwlock_init(&policy->lock);
2518c7c2 288 atomic_set(&policy->refcnt, 1);
a0073fe1 289 skb_queue_head_init(&policy->polq.hold_queue);
b24b8a24
PE		 290 setup_timer(&policy->timer, xfrm_policy_timer,
291 (unsigned long)policy);
a0073fe1
SK		 292 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
293 (unsigned long)policy);
fe1a5f03 294 policy->flo.ops = &xfrm_policy_fc_ops;
1da177e4
LT		 295 }
296 return policy;
297}
298EXPORT_SYMBOL(xfrm_policy_alloc);
299
300/* Destroy xfrm_policy: descendant resources must be released to this moment. */
301
64c31b3f 302void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 303{
12a169e7 304 BUG_ON(!policy->walk.dead);
1da177e4 305
0659eea9 306 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 307 BUG();
308
03e1ad7b 309 security_xfrm_policy_free(policy->security);
1da177e4
LT		 310 kfree(policy);
311}
64c31b3f 312EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 313
a0073fe1
SK		 314static void xfrm_queue_purge(struct sk_buff_head *list)
315{
316 struct sk_buff *skb;
317
302a50bc 318 while ((skb = skb_dequeue(list)) != NULL)
a0073fe1 319 kfree_skb(skb);
a0073fe1
SK		 320}
321
1da177e4
LT		 322/* Rule must be locked. Release descentant resources, announce
323 * entry dead. The rule must be unlinked from lists to the moment.
324 */
325
326static void xfrm_policy_kill(struct xfrm_policy *policy)
327{
12a169e7 328 policy->walk.dead = 1;
1da177e4 329
285ead17 330 atomic_inc(&policy->genid);
1da177e4 331
e7d8f6cb
SK		 332 if (del_timer(&policy->polq.hold_timer))
333 xfrm_pol_put(policy);
a0073fe1
SK		 334 xfrm_queue_purge(&policy->polq.hold_queue);
335
285ead17
TT		 336 if (del_timer(&policy->timer))
337 xfrm_pol_put(policy);
338
339 xfrm_pol_put(policy);
1da177e4
LT		 340}
341
2518c7c2
DM		 342static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
343
e92303f8 344static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 345{
e92303f8 346 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 347}
348
5f803b58
DM		 349static struct hlist_head *policy_hash_bysel(struct net *net,
350 const struct xfrm_selector *sel,
351 unsigned short family, int dir)
2518c7c2 352{
1121994c 353 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 354 unsigned int hash = __sel_hash(sel, family, hmask);
355
356 return (hash == hmask + 1 ?
1121994c
AD		 357 &net->xfrm.policy_inexact[dir] :
358 net->xfrm.policy_bydst[dir].table + hash);
2518c7c2
DM		 359}
360
5f803b58
DM		 361static struct hlist_head *policy_hash_direct(struct net *net,
362 const xfrm_address_t *daddr,
363 const xfrm_address_t *saddr,
364 unsigned short family, int dir)
2518c7c2 365{
1121994c 366 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 367 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
368
1121994c 369 return net->xfrm.policy_bydst[dir].table + hash;
2518c7c2
DM		 370}
371
2518c7c2
DM		 372static void xfrm_dst_hash_transfer(struct hlist_head *list,
373 struct hlist_head *ndsttable,
374 unsigned int nhashmask)
375{
b67bfe0d 376 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 377 struct xfrm_policy *pol;
b791160b 378 unsigned int h0 = 0;
2518c7c2 379
b791160b 380redo:
b67bfe0d 381 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 382 unsigned int h;
383
384 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
385 pol->family, nhashmask);
b791160b 386 if (!entry0) {
b67bfe0d 387 hlist_del(&pol->bydst);
b791160b
YH		 388 hlist_add_head(&pol->bydst, ndsttable+h);
389 h0 = h;
390 } else {
391 if (h != h0)
392 continue;
b67bfe0d 393 hlist_del(&pol->bydst);
b791160b
YH		 394 hlist_add_after(entry0, &pol->bydst);
395 }
b67bfe0d 396 entry0 = &pol->bydst;
b791160b
YH		 397 }
398 if (!hlist_empty(list)) {
399 entry0 = NULL;
400 goto redo;
2518c7c2
DM		 401 }
402}
403
404static void xfrm_idx_hash_transfer(struct hlist_head *list,
405 struct hlist_head *nidxtable,
406 unsigned int nhashmask)
407{
b67bfe0d 408 struct hlist_node *tmp;
2518c7c2
DM		 409 struct xfrm_policy *pol;
410
b67bfe0d 411 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 412 unsigned int h;
413
414 h = __idx_hash(pol->index, nhashmask);
415 hlist_add_head(&pol->byidx, nidxtable+h);
416 }
417}
418
419static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
420{
421 return ((old_hmask + 1) << 1) - 1;
422}
423
66caf628 424static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 425{
66caf628 426 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 427 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
428 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 429 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
44e36b42 430 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
2518c7c2
DM		 431 int i;
432
433 if (!ndst)
434 return;
435
283bc9f3 436 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 437
438 for (i = hmask; i >= 0; i--)
439 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
440
66caf628
AD		 441 net->xfrm.policy_bydst[dir].table = ndst;
442 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 443
283bc9f3 444 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 445
44e36b42 446 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 447}
448
66caf628 449static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 450{
66caf628 451 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 452 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
453 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 454 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 455 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 456 int i;
457
458 if (!nidx)
459 return;
460
283bc9f3 461 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 462
463 for (i = hmask; i >= 0; i--)
464 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
465
66caf628
AD		 466 net->xfrm.policy_byidx = nidx;
467 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 468
283bc9f3 469 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 470
44e36b42 471 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 472}
473
66caf628 474static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 475{
66caf628
AD		 476 unsigned int cnt = net->xfrm.policy_count[dir];
477 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 478
479 if (total)
480 *total += cnt;
481
482 if ((hmask + 1) < xfrm_policy_hashmax &&
483 cnt > hmask)
484 return 1;
485
486 return 0;
487}
488
66caf628 489static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 490{
66caf628 491 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 492
493 if ((hmask + 1) < xfrm_policy_hashmax &&
494 total > hmask)
495 return 1;
496
497 return 0;
498}
499
e071041b 500void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 501{
283bc9f3 502 read_lock_bh(&net->xfrm.xfrm_policy_lock);
e071041b
AD		 503 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
504 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
505 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
506 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
507 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
508 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
509 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 510 si->spdhmcnt = xfrm_policy_hashmax;
283bc9f3 511 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
ecfd6b18
JHS		 512}
513EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 514
ecfd6b18 515static DEFINE_MUTEX(hash_resize_mutex);
66caf628 516static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 517{
66caf628 518 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 519 int dir, total;
520
521 mutex_lock(&hash_resize_mutex);
522
523 total = 0;
524 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
66caf628
AD		 525 if (xfrm_bydst_should_resize(net, dir, &total))
526 xfrm_bydst_resize(net, dir);
2518c7c2 527 }
66caf628
AD		 528 if (xfrm_byidx_should_resize(net, total))
529 xfrm_byidx_resize(net, total);
2518c7c2
DM		 530
531 mutex_unlock(&hash_resize_mutex);
532}
533
1da177e4
LT		 534/* Generate new index... KAME seems to generate them ordered by cost
535 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 536static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 537{
1da177e4
LT		 538 static u32 idx_generator;
539
540 for (;;) {
2518c7c2
DM		 541 struct hlist_head *list;
542 struct xfrm_policy *p;
543 u32 idx;
544 int found;
545
e682adf0
FD		 546 if (!index) {
547 idx = (idx_generator | dir);
548 idx_generator += 8;
549 } else {
550 idx = index;
551 index = 0;
552 }
553
1da177e4
LT		 554 if (idx == 0)
555 idx = 8;
1121994c 556 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 557 found = 0;
b67bfe0d 558 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 559 if (p->index == idx) {
560 found = 1;
1da177e4 561 break;
2518c7c2 562 }
1da177e4 563 }
2518c7c2 564 if (!found)
1da177e4
LT		 565 return idx;
566 }
567}
568
2518c7c2
DM		 569static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
570{
571 u32 *p1 = (u32 *) s1;
572 u32 *p2 = (u32 *) s2;
573 int len = sizeof(struct xfrm_selector) / sizeof(u32);
574 int i;
575
576 for (i = 0; i < len; i++) {
577 if (p1[i] != p2[i])
578 return 1;
579 }
580
581 return 0;
582}
583
a0073fe1
SK		 584static void xfrm_policy_requeue(struct xfrm_policy *old,
585 struct xfrm_policy *new)
586{
587 struct xfrm_policy_queue *pq = &old->polq;
588 struct sk_buff_head list;
589
590 __skb_queue_head_init(&list);
591
592 spin_lock_bh(&pq->hold_queue.lock);
593 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 594 if (del_timer(&pq->hold_timer))
595 xfrm_pol_put(old);
a0073fe1
SK		 596 spin_unlock_bh(&pq->hold_queue.lock);
597
598 if (skb_queue_empty(&list))
599 return;
600
601 pq = &new->polq;
602
603 spin_lock_bh(&pq->hold_queue.lock);
604 skb_queue_splice(&list, &pq->hold_queue);
605 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 606 if (!mod_timer(&pq->hold_timer, jiffies))
607 xfrm_pol_hold(new);
a0073fe1
SK		 608 spin_unlock_bh(&pq->hold_queue.lock);
609}
610
7cb8a939
SK		 611static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
612 struct xfrm_policy *pol)
613{
614 u32 mark = policy->mark.v & policy->mark.m;
615
616 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
617 return true;
618
619 if ((mark & pol->mark.m) == pol->mark.v &&
620 policy->priority == pol->priority)
621 return true;
622
623 return false;
624}
625
1da177e4
LT		 626int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
627{
1121994c 628 struct net *net = xp_net(policy);
2518c7c2
DM		 629 struct xfrm_policy *pol;
630 struct xfrm_policy *delpol;
631 struct hlist_head *chain;
b67bfe0d 632 struct hlist_node *newpos;
1da177e4 633
283bc9f3 634 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1121994c 635 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM		 636 delpol = NULL;
637 newpos = NULL;
b67bfe0d 638 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 639 if (pol->type == policy->type &&
2518c7c2 640 !selector_cmp(&pol->selector, &policy->selector) &&
7cb8a939 641 xfrm_policy_mark_match(policy, pol) &&
a6c7ab55
HX		 642 xfrm_sec_ctx_match(pol->security, policy->security) &&
643 !WARN_ON(delpol)) {
1da177e4 644 if (excl) {
283bc9f3 645 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 646 return -EEXIST;
647 }
1da177e4
LT		 648 delpol = pol;
649 if (policy->priority > pol->priority)
650 continue;
651 } else if (policy->priority >= pol->priority) {
a6c7ab55 652 newpos = &pol->bydst;
1da177e4
LT		 653 continue;
654 }
1da177e4
LT		 655 if (delpol)
656 break;
1da177e4
LT		 657 }
658 if (newpos)
2518c7c2
DM		 659 hlist_add_after(newpos, &policy->bydst);
660 else
661 hlist_add_head(&policy->bydst, chain);
1da177e4 662 xfrm_pol_hold(policy);
1121994c 663 net->xfrm.policy_count[dir]++;
1da177e4 664 atomic_inc(&flow_cache_genid);
ca4c3fc2 665
666 /* After previous checking, family can either be AF_INET or AF_INET6 */
667 if (policy->family == AF_INET)
668 rt_genid_bump_ipv4(net);
669 else
670 rt_genid_bump_ipv6(net);
671
a0073fe1
SK		 672 if (delpol) {
673 xfrm_policy_requeue(delpol, policy);
29fa0b30 674 __xfrm_policy_unlink(delpol, dir);
a0073fe1 675 }
e682adf0 676 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 677 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 678 policy->curlft.add_time = get_seconds();
1da177e4
LT		 679 policy->curlft.use_time = 0;
680 if (!mod_timer(&policy->timer, jiffies + HZ))
681 xfrm_pol_hold(policy);
1121994c 682 list_add(&policy->walk.all, &net->xfrm.policy_all);
283bc9f3 683 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 684
9b78a82c 685 if (delpol)
1da177e4 686 xfrm_policy_kill(delpol);
1121994c
AD		 687 else if (xfrm_bydst_should_resize(net, dir, NULL))
688 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 689
1da177e4
LT		 690 return 0;
691}
692EXPORT_SYMBOL(xfrm_policy_insert);
693
8ca2e93b
JHS		 694struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
695 int dir, struct xfrm_selector *sel,
ef41aaa0
EP		 696 struct xfrm_sec_ctx *ctx, int delete,
697 int *err)
1da177e4 698{
2518c7c2
DM		 699 struct xfrm_policy *pol, *ret;
700 struct hlist_head *chain;
1da177e4 701
ef41aaa0 702 *err = 0;
283bc9f3 703 write_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 704 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2 705 ret = NULL;
b67bfe0d 706 hlist_for_each_entry(pol, chain, bydst) {
2518c7c2 707 if (pol->type == type &&
34f8d884 708 (mark & pol->mark.m) == pol->mark.v &&
2518c7c2
DM		 709 !selector_cmp(sel, &pol->selector) &&
710 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 711 xfrm_pol_hold(pol);
2518c7c2 712 if (delete) {
03e1ad7b
PM		 713 *err = security_xfrm_policy_delete(
714 pol->security);
ef41aaa0 715 if (*err) {
283bc9f3 716 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 717 return pol;
718 }
29fa0b30 719 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 720 }
721 ret = pol;
1da177e4
LT		 722 break;
723 }
724 }
283bc9f3 725 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 726
fe1a5f03 727 if (ret && delete)
2518c7c2 728 xfrm_policy_kill(ret);
2518c7c2 729 return ret;
1da177e4 730}
df71837d 731EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 732
8ca2e93b
JHS		 733struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
734 int dir, u32 id, int delete, int *err)
1da177e4 735{
2518c7c2
DM		 736 struct xfrm_policy *pol, *ret;
737 struct hlist_head *chain;
1da177e4 738
b5505c6e
HX		 739 *err = -ENOENT;
740 if (xfrm_policy_id2dir(id) != dir)
741 return NULL;
742
ef41aaa0 743 *err = 0;
283bc9f3 744 write_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 745 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 746 ret = NULL;
b67bfe0d 747 hlist_for_each_entry(pol, chain, byidx) {
34f8d884
JHS		 748 if (pol->type == type && pol->index == id &&
749 (mark & pol->mark.m) == pol->mark.v) {
1da177e4 750 xfrm_pol_hold(pol);
2518c7c2 751 if (delete) {
03e1ad7b
PM		 752 *err = security_xfrm_policy_delete(
753 pol->security);
ef41aaa0 754 if (*err) {
283bc9f3 755 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 756 return pol;
757 }
29fa0b30 758 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 759 }
760 ret = pol;
1da177e4
LT		 761 break;
762 }
763 }
283bc9f3 764 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 765
fe1a5f03 766 if (ret && delete)
2518c7c2 767 xfrm_policy_kill(ret);
2518c7c2 768 return ret;
1da177e4
LT		 769}
770EXPORT_SYMBOL(xfrm_policy_byid);
771
4aa2e62c
JL		 772#ifdef CONFIG_SECURITY_NETWORK_XFRM
773static inline int
33ffbbd5 774xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
1da177e4 775{
4aa2e62c
JL		 776 int dir, err = 0;
777
778 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
779 struct xfrm_policy *pol;
4aa2e62c
JL		 780 int i;
781
b67bfe0d 782 hlist_for_each_entry(pol,
33ffbbd5 783 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL		 784 if (pol->type != type)
785 continue;
03e1ad7b 786 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 787 if (err) {
ab5f5e8b
JL		 788 xfrm_audit_policy_delete(pol, 0,
789 audit_info->loginuid,
2532386f 790 audit_info->sessionid,
ab5f5e8b 791 audit_info->secid);
4aa2e62c
JL		 792 return err;
793 }
7dc12d6d 794 }
33ffbbd5 795 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
b67bfe0d 796 hlist_for_each_entry(pol,
33ffbbd5 797 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL		 798 bydst) {
799 if (pol->type != type)
800 continue;
03e1ad7b
PM		 801 err = security_xfrm_policy_delete(
802 pol->security);
4aa2e62c 803 if (err) {
ab5f5e8b
JL		 804 xfrm_audit_policy_delete(pol, 0,
805 audit_info->loginuid,
2532386f 806 audit_info->sessionid,
ab5f5e8b 807 audit_info->secid);
4aa2e62c
JL		 808 return err;
809 }
810 }
811 }
812 }
813 return err;
814}
815#else
816static inline int
33ffbbd5 817xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c
JL		 818{
819 return 0;
820}
821#endif
822
33ffbbd5 823int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c 824{
2f1eb65f 825 int dir, err = 0, cnt = 0;
1da177e4 826
283bc9f3 827 write_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 828
33ffbbd5 829 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
4aa2e62c
JL		 830 if (err)
831 goto out;
832
1da177e4 833 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2 834 struct xfrm_policy *pol;
29fa0b30 835 int i;
2518c7c2
DM		 836
837 again1:
b67bfe0d 838 hlist_for_each_entry(pol,
33ffbbd5 839 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM		 840 if (pol->type != type)
841 continue;
ea2dea9d 842 __xfrm_policy_unlink(pol, dir);
283bc9f3 843 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 844 cnt++;
1da177e4 845
ab5f5e8b 846 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
2532386f 847 audit_info->sessionid,
ab5f5e8b 848 audit_info->secid);
161a09e7 849
2518c7c2 850 xfrm_policy_kill(pol);
1da177e4 851
283bc9f3 852 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 853 goto again1;
854 }
855
33ffbbd5 856 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2 857 again2:
b67bfe0d 858 hlist_for_each_entry(pol,
33ffbbd5 859 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM		 860 bydst) {
861 if (pol->type != type)
862 continue;
ea2dea9d 863 __xfrm_policy_unlink(pol, dir);
283bc9f3 864 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 865 cnt++;
2518c7c2 866
ab5f5e8b
JL		 867 xfrm_audit_policy_delete(pol, 1,
868 audit_info->loginuid,
2532386f 869 audit_info->sessionid,
ab5f5e8b 870 audit_info->secid);
2518c7c2
DM		 871 xfrm_policy_kill(pol);
872
283bc9f3 873 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 874 goto again2;
875 }
1da177e4 876 }
2518c7c2 877
1da177e4 878 }
2f1eb65f
JHS		 879 if (!cnt)
880 err = -ESRCH;
4aa2e62c 881out:
283bc9f3 882 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 883 return err;
1da177e4
LT		 884}
885EXPORT_SYMBOL(xfrm_policy_flush);
886
cdcbca7c 887int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 888 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 889 void *data)
890{
12a169e7
HX		 891 struct xfrm_policy *pol;
892 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 893 int error = 0;
894
895 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
896 walk->type != XFRM_POLICY_TYPE_ANY)
897 return -EINVAL;
1da177e4 898
12a169e7 899 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 900 return 0;
901
283bc9f3 902 write_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 903 if (list_empty(&walk->walk.all))
cdcbca7c 904 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7
HX		 905 else
906 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
cdcbca7c 907 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 908 if (x->dead)
4c563f76 909 continue;
12a169e7
HX		 910 pol = container_of(x, struct xfrm_policy, walk);
911 if (walk->type != XFRM_POLICY_TYPE_ANY &&
912 walk->type != pol->type)
913 continue;
914 error = func(pol, xfrm_policy_id2dir(pol->index),
915 walk->seq, data);
916 if (error) {
917 list_move_tail(&walk->walk.all, &x->all);
918 goto out;
2518c7c2 919 }
12a169e7 920 walk->seq++;
1da177e4 921 }
12a169e7 922 if (walk->seq == 0) {
baf5d743
JHS		 923 error = -ENOENT;
924 goto out;
925 }
12a169e7 926 list_del_init(&walk->walk.all);
1da177e4 927out:
283bc9f3 928 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 929 return error;
930}
931EXPORT_SYMBOL(xfrm_policy_walk);
932
12a169e7
HX		 933void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
934{
935 INIT_LIST_HEAD(&walk->walk.all);
936 walk->walk.dead = 1;
937 walk->type = type;
938 walk->seq = 0;
939}
940EXPORT_SYMBOL(xfrm_policy_walk_init);
941
283bc9f3 942void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 943{
944 if (list_empty(&walk->walk.all))
945 return;
946
283bc9f3 947 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 948 list_del(&walk->walk.all);
283bc9f3 949 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 950}
951EXPORT_SYMBOL(xfrm_policy_walk_done);
952
134b0fc5
JM		 953/*
954 * Find policy to apply to this flow.
955 *
956 * Returns 0 if policy found, else an -errno.
957 */
f299d557
DM		 958static int xfrm_policy_match(const struct xfrm_policy *pol,
959 const struct flowi *fl,
2518c7c2 960 u8 type, u16 family, int dir)
1da177e4 961{
f299d557 962 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 963 int ret = -ESRCH;
964 bool match;
1da177e4 965
2518c7c2 966 if (pol->family != family ||
1d28f42c 967 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 968 pol->type != type)
134b0fc5 969 return ret;
1da177e4 970
2518c7c2 971 match = xfrm_selector_match(sel, fl, family);
134b0fc5 972 if (match)
1d28f42c 973 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 974 dir);
2518c7c2 975
134b0fc5 976 return ret;
2518c7c2 977}
1da177e4 978
52479b62 979static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 980 const struct flowi *fl,
2518c7c2
DM		 981 u16 family, u8 dir)
982{
134b0fc5 983 int err;
2518c7c2 984 struct xfrm_policy *pol, *ret;
0b597e7e 985 const xfrm_address_t *daddr, *saddr;
2518c7c2 986 struct hlist_head *chain;
acba48e1 987 u32 priority = ~0U;
df71837d 988
2518c7c2
DM		 989 daddr = xfrm_flowi_daddr(fl, family);
990 saddr = xfrm_flowi_saddr(fl, family);
991 if (unlikely(!daddr || !saddr))
992 return NULL;
993
283bc9f3 994 read_lock_bh(&net->xfrm.xfrm_policy_lock);
52479b62 995 chain = policy_hash_direct(net, daddr, saddr, family, dir);
2518c7c2 996 ret = NULL;
b67bfe0d 997 hlist_for_each_entry(pol, chain, bydst) {
134b0fc5
JM		 998 err = xfrm_policy_match(pol, fl, type, family, dir);
999 if (err) {
1000 if (err == -ESRCH)
1001 continue;
1002 else {
1003 ret = ERR_PTR(err);
1004 goto fail;
1005 }
1006 } else {
2518c7c2 1007 ret = pol;
acba48e1 1008 priority = ret->priority;
2518c7c2
DM		 1009 break;
1010 }
1011 }
52479b62 1012 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 1013 hlist_for_each_entry(pol, chain, bydst) {
134b0fc5
JM		 1014 err = xfrm_policy_match(pol, fl, type, family, dir);
1015 if (err) {
1016 if (err == -ESRCH)
1017 continue;
1018 else {
1019 ret = ERR_PTR(err);
1020 goto fail;
1021 }
1022 } else if (pol->priority < priority) {
acba48e1
DM		 1023 ret = pol;
1024 break;
1da177e4
LT		 1025 }
1026 }
acba48e1
DM		 1027 if (ret)
1028 xfrm_pol_hold(ret);
134b0fc5 1029fail:
283bc9f3 1030 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
4e81bb83 1031
2518c7c2 1032 return ret;
4e81bb83
MN		 1033}
1034
80c802f3 1035static struct xfrm_policy *
73ff93cd 1036__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1037{
1038#ifdef CONFIG_XFRM_SUB_POLICY
1039 struct xfrm_policy *pol;
1040
1041 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1042 if (pol != NULL)
1043 return pol;
1044#endif
1045 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1046}
1047
b5fb82c4
BZ		 1048static int flow_to_policy_dir(int dir)
1049{
1050 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1051 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1052 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1053 return dir;
1054
1055 switch (dir) {
1056 default:
1057 case FLOW_DIR_IN:
1058 return XFRM_POLICY_IN;
1059 case FLOW_DIR_OUT:
1060 return XFRM_POLICY_OUT;
1061 case FLOW_DIR_FWD:
1062 return XFRM_POLICY_FWD;
1063 }
1064}
1065
fe1a5f03 1066static struct flow_cache_object *
dee9f4bc 1067xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
fe1a5f03 1068 u8 dir, struct flow_cache_object *old_obj, void *ctx)
4e81bb83
MN		 1069{
1070 struct xfrm_policy *pol;
fe1a5f03
TT		 1071
1072 if (old_obj)
1073 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
4e81bb83 1074
b5fb82c4 1075 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
80c802f3 1076 if (IS_ERR_OR_NULL(pol))
fe1a5f03 1077 return ERR_CAST(pol);
fe1a5f03 1078
fe1a5f03
TT		 1079 /* Resolver returns two references:
1080 * one for cache and one for caller of flow_cache_lookup() */
1081 xfrm_pol_hold(pol);
1082
1083 return &pol->flo;
1da177e4
LT		 1084}
1085
df71837d
TJ		 1086static inline int policy_to_flow_dir(int dir)
1087{
1088 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH		 1089 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1090 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1091 return dir;
1092 switch (dir) {
1093 default:
1094 case XFRM_POLICY_IN:
1095 return FLOW_DIR_IN;
1096 case XFRM_POLICY_OUT:
1097 return FLOW_DIR_OUT;
1098 case XFRM_POLICY_FWD:
1099 return FLOW_DIR_FWD;
3ff50b79 1100 }
df71837d
TJ		 1101}
1102
dee9f4bc
DM		 1103static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1104 const struct flowi *fl)
1da177e4
LT		 1105{
1106 struct xfrm_policy *pol;
283bc9f3 1107 struct net *net = sock_net(sk);
1da177e4 1108
283bc9f3 1109 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1110 if ((pol = sk->sk_policy[dir]) != NULL) {
bc9b35ad
DM		 1111 bool match = xfrm_selector_match(&pol->selector, fl,
1112 sk->sk_family);
a716c119 1113 int err = 0;
df71837d 1114
3bccfbc7 1115 if (match) {
34f8d884
JHS		 1116 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1117 pol = NULL;
1118 goto out;
1119 }
03e1ad7b 1120 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1121 fl->flowi_secid,
03e1ad7b 1122 policy_to_flow_dir(dir));
3bccfbc7
VY		 1123 if (!err)
1124 xfrm_pol_hold(pol);
1125 else if (err == -ESRCH)
1126 pol = NULL;
1127 else
1128 pol = ERR_PTR(err);
1129 } else
1da177e4
LT		 1130 pol = NULL;
1131 }
34f8d884 1132out:
283bc9f3 1133 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1134 return pol;
1135}
1136
1137static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1138{
98806f75 1139 struct net *net = xp_net(pol);
1121994c 1140 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
2518c7c2 1141 pol->family, dir);
4e81bb83 1142
98806f75 1143 list_add(&pol->walk.all, &net->xfrm.policy_all);
2518c7c2 1144 hlist_add_head(&pol->bydst, chain);
e92303f8 1145 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
98806f75 1146 net->xfrm.policy_count[dir]++;
1da177e4 1147 xfrm_pol_hold(pol);
2518c7c2 1148
98806f75
AD		 1149 if (xfrm_bydst_should_resize(net, dir, NULL))
1150 schedule_work(&net->xfrm.policy_hash_work);
1da177e4
LT		 1151}
1152
1153static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1154 int dir)
1155{
98806f75
AD		 1156 struct net *net = xp_net(pol);
1157
2518c7c2
DM		 1158 if (hlist_unhashed(&pol->bydst))
1159 return NULL;
1da177e4 1160
2518c7c2
DM		 1161 hlist_del(&pol->bydst);
1162 hlist_del(&pol->byidx);
12a169e7 1163 list_del(&pol->walk.all);
98806f75 1164 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1165
1166 return pol;
1da177e4
LT		 1167}
1168
4666faab 1169int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1170{
283bc9f3
FD		 1171 struct net *net = xp_net(pol);
1172
1173 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1174 pol = __xfrm_policy_unlink(pol, dir);
283bc9f3 1175 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1176 if (pol) {
1da177e4 1177 xfrm_policy_kill(pol);
4666faab 1178 return 0;
1da177e4 1179 }
4666faab 1180 return -ENOENT;
1da177e4 1181}
a70fcb0b 1182EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1183
1184int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1185{
1121994c 1186 struct net *net = xp_net(pol);
1da177e4
LT		 1187 struct xfrm_policy *old_pol;
1188
4e81bb83
MN		 1189#ifdef CONFIG_XFRM_SUB_POLICY
1190 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1191 return -EINVAL;
1192#endif
1193
283bc9f3 1194 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1195 old_pol = sk->sk_policy[dir];
1196 sk->sk_policy[dir] = pol;
1197 if (pol) {
9d729f72 1198 pol->curlft.add_time = get_seconds();
e682adf0 1199 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1da177e4
LT		 1200 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1201 }
a0073fe1
SK		 1202 if (old_pol) {
1203 if (pol)
1204 xfrm_policy_requeue(old_pol, pol);
1205
ea2dea9d
TT		 1206 /* Unlinking succeeds always. This is the only function
1207 * allowed to delete or replace socket policy.
1208 */
1da177e4 1209 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
a0073fe1 1210 }
283bc9f3 1211 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1212
1213 if (old_pol) {
1214 xfrm_policy_kill(old_pol);
1215 }
1216 return 0;
1217}
1218
d3e40a9f 1219static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1220{
0331b1f3 1221 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1222 struct net *net = xp_net(old);
1da177e4
LT		 1223
1224 if (newp) {
1225 newp->selector = old->selector;
03e1ad7b
PM		 1226 if (security_xfrm_policy_clone(old->security,
1227 &newp->security)) {
df71837d
TJ		 1228 kfree(newp);
1229 return NULL; /* ENOMEM */
1230 }
1da177e4
LT		 1231 newp->lft = old->lft;
1232 newp->curlft = old->curlft;
fb977e2c 1233 newp->mark = old->mark;
1da177e4
LT		 1234 newp->action = old->action;
1235 newp->flags = old->flags;
1236 newp->xfrm_nr = old->xfrm_nr;
1237 newp->index = old->index;
4e81bb83 1238 newp->type = old->type;
1da177e4
LT		 1239 memcpy(newp->xfrm_vec, old->xfrm_vec,
1240 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
283bc9f3 1241 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1242 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
283bc9f3 1243 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1244 xfrm_pol_put(newp);
1245 }
1246 return newp;
1247}
1248
1249int __xfrm_sk_clone_policy(struct sock *sk)
1250{
1251 struct xfrm_policy *p0 = sk->sk_policy[0],
1252 *p1 = sk->sk_policy[1];
1253
1254 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1255 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1256 return -ENOMEM;
1257 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1258 return -ENOMEM;
1259 return 0;
1260}
1261
a1e59abf 1262static int
fbda33b2 1263xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
a1e59abf
PM		 1264 unsigned short family)
1265{
1266 int err;
1267 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1268
1269 if (unlikely(afinfo == NULL))
1270 return -EINVAL;
fbda33b2 1271 err = afinfo->get_saddr(net, local, remote);
a1e59abf
PM		 1272 xfrm_policy_put_afinfo(afinfo);
1273 return err;
1274}
1275
1da177e4
LT		 1276/* Resolve list of templates for the flow, given policy. */
1277
1278static int
a6c2e611
DM		 1279xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1280 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1281{
fbda33b2 1282 struct net *net = xp_net(policy);
1da177e4
LT		 1283 int nx;
1284 int i, error;
1285 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1286 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1287 xfrm_address_t tmp;
1da177e4 1288
9b7a787d 1289 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4
LT		 1290 struct xfrm_state *x;
1291 xfrm_address_t *remote = daddr;
1292 xfrm_address_t *local = saddr;
1293 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1294
48b8d783
JK		 1295 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1296 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT		 1297 remote = &tmpl->id.daddr;
1298 local = &tmpl->saddr;
8444cf71
TE		 1299 if (xfrm_addr_any(local, tmpl->encap_family)) {
1300 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
a1e59abf
PM		 1301 if (error)
1302 goto fail;
1303 local = &tmp;
1304 }
1da177e4
LT		 1305 }
1306
1307 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1308
1309 if (x && x->km.state == XFRM_STATE_VALID) {
1310 xfrm[nx++] = x;
1311 daddr = remote;
1312 saddr = local;
1313 continue;
1314 }
1315 if (x) {
1316 error = (x->km.state == XFRM_STATE_ERROR ?
1317 -EINVAL : -EAGAIN);
1318 xfrm_state_put(x);
42054569 1319 } else if (error == -ESRCH) {
a4322266 1320 error = -EAGAIN;
42054569 1321 }
1da177e4
LT		 1322
1323 if (!tmpl->optional)
1324 goto fail;
1325 }
1326 return nx;
1327
1328fail:
9b7a787d 1329 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1330 xfrm_state_put(xfrm[nx]);
1331 return error;
1332}
1333
4e81bb83 1334static int
a6c2e611
DM		 1335xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1336 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1337{
41a49cc3
MN		 1338 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1339 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1340 int cnx = 0;
1341 int error;
1342 int ret;
1343 int i;
1344
1345 for (i = 0; i < npols; i++) {
1346 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1347 error = -ENOBUFS;
1348 goto fail;
1349 }
41a49cc3
MN		 1350
1351 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1352 if (ret < 0) {
1353 error = ret;
1354 goto fail;
1355 } else
1356 cnx += ret;
1357 }
1358
41a49cc3
MN		 1359 /* found states are sorted for outbound processing */
1360 if (npols > 1)
1361 xfrm_state_sort(xfrm, tpp, cnx, family);
1362
4e81bb83
MN		 1363 return cnx;
1364
1365 fail:
9b7a787d 1366 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1367 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1368 return error;
1369
1370}
1371
1da177e4
LT		 1372/* Check that the bundle accepts the flow and its components are
1373 * still valid.
1374 */
1375
05d84025 1376static inline int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286
HX		 1377{
1378 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1379 int tos;
1da177e4 1380
25ee3286
HX		 1381 if (!afinfo)
1382 return -EINVAL;
1383
1384 tos = afinfo->get_tos(fl);
1385
1386 xfrm_policy_put_afinfo(afinfo);
1387
1388 return tos;
1389}
1390
80c802f3
TT		 1391static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1392{
1393 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1394 struct dst_entry *dst = &xdst->u.dst;
1395
1396 if (xdst->route == NULL) {
1397 /* Dummy bundle - if it has xfrms we were not
1398 * able to build bundle as template resolution failed.
1399 * It means we need to try again resolving. */
1400 if (xdst->num_xfrms > 0)
1401 return NULL;
a0073fe1
SK		 1402 } else if (dst->flags & DST_XFRM_QUEUE) {
1403 return NULL;
80c802f3
TT		 1404 } else {
1405 /* Real bundle */
1406 if (stale_bundle(dst))
1407 return NULL;
1408 }
1409
1410 dst_hold(dst);
1411 return flo;
1412}
1413
1414static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1415{
1416 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1417 struct dst_entry *dst = &xdst->u.dst;
1418
1419 if (!xdst->route)
1420 return 0;
1421 if (stale_bundle(dst))
1422 return 0;
1423
1424 return 1;
1425}
1426
1427static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1428{
1429 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1430 struct dst_entry *dst = &xdst->u.dst;
1431
1432 dst_free(dst);
1433}
1434
1435static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1436 .get = xfrm_bundle_flo_get,
1437 .check = xfrm_bundle_flo_check,
1438 .delete = xfrm_bundle_flo_delete,
1439};
1440
d7c7544c 1441static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1442{
1da177e4 1443 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1444 struct dst_ops *dst_ops;
25ee3286
HX		 1445 struct xfrm_dst *xdst;
1446
1447 if (!afinfo)
1448 return ERR_PTR(-EINVAL);
1449
d7c7544c
AD		 1450 switch (family) {
1451 case AF_INET:
1452 dst_ops = &net->xfrm.xfrm4_dst_ops;
1453 break;
dfd56b8b 1454#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1455 case AF_INET6:
1456 dst_ops = &net->xfrm.xfrm6_dst_ops;
1457 break;
1458#endif
1459 default:
1460 BUG();
1461 }
f5b0a874 1462 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
25ee3286 1463
d4cae562 1464 if (likely(xdst)) {
141e369d
SK		 1465 struct dst_entry *dst = &xdst->u.dst;
1466
1467 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
0b150932 1468 xdst->flo.ops = &xfrm_bundle_fc_ops;
9d7b0fc1
PM		 1469 if (afinfo->init_dst)
1470 afinfo->init_dst(net, xdst);
d4cae562 1471 } else
0b150932 1472 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1473
d4cae562
MB		 1474 xfrm_policy_put_afinfo(afinfo);
1475
25ee3286
HX		 1476 return xdst;
1477}
1478
a1b05140
MN		 1479static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1480 int nfheader_len)
1481{
1482 struct xfrm_policy_afinfo *afinfo =
1483 xfrm_policy_get_afinfo(dst->ops->family);
1484 int err;
1485
1486 if (!afinfo)
1487 return -EINVAL;
1488
1489 err = afinfo->init_path(path, dst, nfheader_len);
1490
1491 xfrm_policy_put_afinfo(afinfo);
1492
1493 return err;
1494}
1495
87c1e12b 1496static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1497 const struct flowi *fl)
25ee3286
HX		 1498{
1499 struct xfrm_policy_afinfo *afinfo =
1500 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1501 int err;
1502
1503 if (!afinfo)
1da177e4 1504 return -EINVAL;
25ee3286 1505
87c1e12b 1506 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1507
1da177e4 1508 xfrm_policy_put_afinfo(afinfo);
25ee3286 1509
1da177e4
LT		 1510 return err;
1511}
1512
80c802f3 1513
25ee3286
HX		 1514/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1515 * all the metrics... Shortly, bundle a bundle.
1516 */
1517
1518static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1519 struct xfrm_state **xfrm, int nx,
98313ada 1520 const struct flowi *fl,
25ee3286
HX		 1521 struct dst_entry *dst)
1522{
d7c7544c 1523 struct net *net = xp_net(policy);
25ee3286
HX		 1524 unsigned long now = jiffies;
1525 struct net_device *dev;
43a4dea4 1526 struct xfrm_mode *inner_mode;
25ee3286
HX		 1527 struct dst_entry *dst_prev = NULL;
1528 struct dst_entry *dst0 = NULL;
1529 int i = 0;
1530 int err;
1531 int header_len = 0;
a1b05140 1532 int nfheader_len = 0;
25ee3286
HX		 1533 int trailer_len = 0;
1534 int tos;
1535 int family = policy->selector.family;
9bb182a7
YH		 1536 xfrm_address_t saddr, daddr;
1537
1538 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1539
1540 tos = xfrm_get_tos(fl, family);
1541 err = tos;
1542 if (tos < 0)
1543 goto put_states;
1544
1545 dst_hold(dst);
1546
1547 for (; i < nx; i++) {
d7c7544c 1548 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1549 struct dst_entry *dst1 = &xdst->u.dst;
1550
1551 err = PTR_ERR(xdst);
1552 if (IS_ERR(xdst)) {
1553 dst_release(dst);
1554 goto put_states;
1555 }
1556
43a4dea4
SK		 1557 if (xfrm[i]->sel.family == AF_UNSPEC) {
1558 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1559 xfrm_af2proto(family));
1560 if (!inner_mode) {
1561 err = -EAFNOSUPPORT;
1562 dst_release(dst);
1563 goto put_states;
1564 }
1565 } else
1566 inner_mode = xfrm[i]->inner_mode;
1567
25ee3286
HX		 1568 if (!dst_prev)
1569 dst0 = dst1;
1570 else {
1571 dst_prev->child = dst_clone(dst1);
1572 dst1->flags |= DST_NOHASH;
1573 }
1574
1575 xdst->route = dst;
defb3519 1576 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1577
1578 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1579 family = xfrm[i]->props.family;
9bb182a7
YH		 1580 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1581 family);
25ee3286
HX		 1582 err = PTR_ERR(dst);
1583 if (IS_ERR(dst))
1584 goto put_states;
1585 } else
1586 dst_hold(dst);
1587
1588 dst1->xfrm = xfrm[i];
80c802f3 1589 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1590
f5b0a874 1591 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1592 dst1->flags |= DST_HOST;
1593 dst1->lastuse = now;
1594
1595 dst1->input = dst_discard;
43a4dea4 1596 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1597
1598 dst1->next = dst_prev;
1599 dst_prev = dst1;
1600
1601 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1602 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1603 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1604 trailer_len += xfrm[i]->props.trailer_len;
1605 }
1606
1607 dst_prev->child = dst;
1608 dst0->path = dst;
1609
1610 err = -ENODEV;
1611 dev = dst->dev;
1612 if (!dev)
1613 goto free_dst;
1614
a1b05140 1615 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1616 xfrm_init_pmtu(dst_prev);
1617
1618 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1619 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1620
87c1e12b 1621 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1622 if (err)
1623 goto free_dst;
1624
1625 dst_prev->header_len = header_len;
1626 dst_prev->trailer_len = trailer_len;
1627 header_len -= xdst->u.dst.xfrm->props.header_len;
1628 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1629 }
1630
1631out:
1632 return dst0;
1633
1634put_states:
1635 for (; i < nx; i++)
1636 xfrm_state_put(xfrm[i]);
1637free_dst:
1638 if (dst0)
1639 dst_free(dst0);
1640 dst0 = ERR_PTR(err);
1641 goto out;
1642}
1643
da7c224b 1644#ifdef CONFIG_XFRM_SUB_POLICY
be7928d2 1645static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
157bfc25
MN		 1646{
1647 if (!*target) {
1648 *target = kmalloc(size, GFP_ATOMIC);
1649 if (!*target)
1650 return -ENOMEM;
1651 }
be7928d2 1652
157bfc25
MN		 1653 memcpy(*target, src, size);
1654 return 0;
1655}
da7c224b 1656#endif
157bfc25 1657
be7928d2
DB		 1658static int xfrm_dst_update_parent(struct dst_entry *dst,
1659 const struct xfrm_selector *sel)
157bfc25
MN		 1660{
1661#ifdef CONFIG_XFRM_SUB_POLICY
1662 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1663 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1664 sel, sizeof(*sel));
1665#else
1666 return 0;
1667#endif
1668}
1669
be7928d2
DB		 1670static int xfrm_dst_update_origin(struct dst_entry *dst,
1671 const struct flowi *fl)
157bfc25
MN		 1672{
1673#ifdef CONFIG_XFRM_SUB_POLICY
1674 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1675 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1676#else
1677 return 0;
1678#endif
1679}
1da177e4 1680
73ff93cd 1681static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1682 struct xfrm_policy **pols,
1683 int *num_pols, int *num_xfrms)
1684{
1685 int i;
1686
1687 if (*num_pols == 0 || !pols[0]) {
1688 *num_pols = 0;
1689 *num_xfrms = 0;
1690 return 0;
1691 }
1692 if (IS_ERR(pols[0]))
1693 return PTR_ERR(pols[0]);
1694
1695 *num_xfrms = pols[0]->xfrm_nr;
1696
1697#ifdef CONFIG_XFRM_SUB_POLICY
1698 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1699 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1700 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1701 XFRM_POLICY_TYPE_MAIN,
1702 fl, family,
1703 XFRM_POLICY_OUT);
1704 if (pols[1]) {
1705 if (IS_ERR(pols[1])) {
1706 xfrm_pols_put(pols, *num_pols);
1707 return PTR_ERR(pols[1]);
1708 }
02d0892f 1709 (*num_pols)++;
80c802f3
TT		 1710 (*num_xfrms) += pols[1]->xfrm_nr;
1711 }
1712 }
1713#endif
1714 for (i = 0; i < *num_pols; i++) {
1715 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1716 *num_xfrms = -1;
1717 break;
1718 }
1719 }
1720
1721 return 0;
1722
1723}
1724
1725static struct xfrm_dst *
1726xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1727 const struct flowi *fl, u16 family,
80c802f3
TT		 1728 struct dst_entry *dst_orig)
1729{
1730 struct net *net = xp_net(pols[0]);
1731 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1732 struct dst_entry *dst;
1733 struct xfrm_dst *xdst;
1734 int err;
1735
1736 /* Try to instantiate a bundle */
1737 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1738 if (err <= 0) {
1739 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1740 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1741 return ERR_PTR(err);
1742 }
1743
1744 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1745 if (IS_ERR(dst)) {
1746 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1747 return ERR_CAST(dst);
1748 }
1749
1750 xdst = (struct xfrm_dst *)dst;
1751 xdst->num_xfrms = err;
1752 if (num_pols > 1)
1753 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1754 else
1755 err = xfrm_dst_update_origin(dst, fl);
1756 if (unlikely(err)) {
1757 dst_free(dst);
1758 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1759 return ERR_PTR(err);
1760 }
1761
1762 xdst->num_pols = num_pols;
3e94c2dc 1763 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1764 xdst->policy_genid = atomic_read(&pols[0]->genid);
1765
1766 return xdst;
1767}
1768
a0073fe1
SK		 1769static void xfrm_policy_queue_process(unsigned long arg)
1770{
1771 int err = 0;
1772 struct sk_buff *skb;
1773 struct sock *sk;
1774 struct dst_entry *dst;
a0073fe1
SK		 1775 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1776 struct xfrm_policy_queue *pq = &pol->polq;
1777 struct flowi fl;
1778 struct sk_buff_head list;
1779
1780 spin_lock(&pq->hold_queue.lock);
1781 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1782 if (!skb) {
1783 spin_unlock(&pq->hold_queue.lock);
1784 goto out;
1785 }
a0073fe1
SK		 1786 dst = skb_dst(skb);
1787 sk = skb->sk;
1788 xfrm_decode_session(skb, &fl, dst->ops->family);
1789 spin_unlock(&pq->hold_queue.lock);
1790
1791 dst_hold(dst->path);
1792 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1793 sk, 0);
1794 if (IS_ERR(dst))
1795 goto purge_queue;
1796
1797 if (dst->flags & DST_XFRM_QUEUE) {
1798 dst_release(dst);
1799
1800 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1801 goto purge_queue;
1802
1803 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1804 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1805 xfrm_pol_hold(pol);
1806 goto out;
a0073fe1
SK		 1807 }
1808
1809 dst_release(dst);
1810
1811 __skb_queue_head_init(&list);
1812
1813 spin_lock(&pq->hold_queue.lock);
1814 pq->timeout = 0;
1815 skb_queue_splice_init(&pq->hold_queue, &list);
1816 spin_unlock(&pq->hold_queue.lock);
1817
1818 while (!skb_queue_empty(&list)) {
1819 skb = __skb_dequeue(&list);
1820
1821 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1822 dst_hold(skb_dst(skb)->path);
1823 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1824 &fl, skb->sk, 0);
1825 if (IS_ERR(dst)) {
a0073fe1
SK		 1826 kfree_skb(skb);
1827 continue;
1828 }
1829
1830 nf_reset(skb);
1831 skb_dst_drop(skb);
1832 skb_dst_set(skb, dst);
1833
a0073fe1 1834 err = dst_output(skb);
a0073fe1
SK		 1835 }
1836
e7d8f6cb
SK		 1837out:
1838 xfrm_pol_put(pol);
a0073fe1
SK		 1839 return;
1840
1841purge_queue:
1842 pq->timeout = 0;
1843 xfrm_queue_purge(&pq->hold_queue);
e7d8f6cb 1844 xfrm_pol_put(pol);
a0073fe1
SK		 1845}
1846
1847static int xdst_queue_output(struct sk_buff *skb)
1848{
1849 unsigned long sched_next;
1850 struct dst_entry *dst = skb_dst(skb);
1851 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 1852 struct xfrm_policy *pol = xdst->pols[0];
1853 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4
SK		 1854 const struct sk_buff *fclone = skb + 1;
1855
1856 if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
1857 fclone->fclone == SKB_FCLONE_CLONE)) {
1858 kfree_skb(skb);
1859 return 0;
1860 }
a0073fe1
SK		 1861
1862 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1863 kfree_skb(skb);
1864 return -EAGAIN;
1865 }
1866
1867 skb_dst_force(skb);
a0073fe1
SK		 1868
1869 spin_lock_bh(&pq->hold_queue.lock);
1870
1871 if (!pq->timeout)
1872 pq->timeout = XFRM_QUEUE_TMO_MIN;
1873
1874 sched_next = jiffies + pq->timeout;
1875
1876 if (del_timer(&pq->hold_timer)) {
1877 if (time_before(pq->hold_timer.expires, sched_next))
1878 sched_next = pq->hold_timer.expires;
e7d8f6cb 1879 xfrm_pol_put(pol);
a0073fe1
SK		 1880 }
1881
1882 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 1883 if (!mod_timer(&pq->hold_timer, sched_next))
1884 xfrm_pol_hold(pol);
a0073fe1
SK		 1885
1886 spin_unlock_bh(&pq->hold_queue.lock);
1887
1888 return 0;
1889}
1890
1891static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
1892 struct dst_entry *dst,
1893 const struct flowi *fl,
1894 int num_xfrms,
1895 u16 family)
1896{
1897 int err;
1898 struct net_device *dev;
1899 struct dst_entry *dst1;
1900 struct xfrm_dst *xdst;
1901
1902 xdst = xfrm_alloc_dst(net, family);
1903 if (IS_ERR(xdst))
1904 return xdst;
1905
5b8ef341 1906 if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0)
a0073fe1
SK		 1907 return xdst;
1908
1909 dst1 = &xdst->u.dst;
1910 dst_hold(dst);
1911 xdst->route = dst;
1912
1913 dst_copy_metrics(dst1, dst);
1914
1915 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1916 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
1917 dst1->lastuse = jiffies;
1918
1919 dst1->input = dst_discard;
1920 dst1->output = xdst_queue_output;
1921
1922 dst_hold(dst);
1923 dst1->child = dst;
1924 dst1->path = dst;
1925
1926 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
1927
1928 err = -ENODEV;
1929 dev = dst->dev;
1930 if (!dev)
1931 goto free_dst;
1932
1933 err = xfrm_fill_dst(xdst, dev, fl);
1934 if (err)
1935 goto free_dst;
1936
1937out:
1938 return xdst;
1939
1940free_dst:
1941 dst_release(dst1);
1942 xdst = ERR_PTR(err);
1943 goto out;
1944}
1945
80c802f3 1946static struct flow_cache_object *
dee9f4bc 1947xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 1948 struct flow_cache_object *oldflo, void *ctx)
1949{
1950 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1951 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1952 struct xfrm_dst *xdst, *new_xdst;
1953 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1954
1955 /* Check if the policies from old bundle are usable */
1956 xdst = NULL;
1957 if (oldflo) {
1958 xdst = container_of(oldflo, struct xfrm_dst, flo);
1959 num_pols = xdst->num_pols;
1960 num_xfrms = xdst->num_xfrms;
1961 pol_dead = 0;
1962 for (i = 0; i < num_pols; i++) {
1963 pols[i] = xdst->pols[i];
1964 pol_dead |= pols[i]->walk.dead;
1965 }
1966 if (pol_dead) {
1967 dst_free(&xdst->u.dst);
1968 xdst = NULL;
1969 num_pols = 0;
1970 num_xfrms = 0;
1971 oldflo = NULL;
1972 }
1973 }
1974
1975 /* Resolve policies to use if we couldn't get them from
1976 * previous cache entry */
1977 if (xdst == NULL) {
1978 num_pols = 1;
b5fb82c4
BZ		 1979 pols[0] = __xfrm_policy_lookup(net, fl, family,
1980 flow_to_policy_dir(dir));
80c802f3
TT		 1981 err = xfrm_expand_policies(fl, family, pols,
1982 &num_pols, &num_xfrms);
1983 if (err < 0)
1984 goto inc_error;
1985 if (num_pols == 0)
1986 return NULL;
1987 if (num_xfrms <= 0)
1988 goto make_dummy_bundle;
1989 }
1990
1991 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1992 if (IS_ERR(new_xdst)) {
1993 err = PTR_ERR(new_xdst);
1994 if (err != -EAGAIN)
1995 goto error;
1996 if (oldflo == NULL)
1997 goto make_dummy_bundle;
1998 dst_hold(&xdst->u.dst);
1999 return oldflo;
d809ec89
TT		 2000 } else if (new_xdst == NULL) {
2001 num_xfrms = 0;
2002 if (oldflo == NULL)
2003 goto make_dummy_bundle;
2004 xdst->num_xfrms = 0;
2005 dst_hold(&xdst->u.dst);
2006 return oldflo;
80c802f3
TT		 2007 }
2008
2009 /* Kill the previous bundle */
2010 if (xdst) {
2011 /* The policies were stolen for newly generated bundle */
2012 xdst->num_pols = 0;
2013 dst_free(&xdst->u.dst);
2014 }
2015
2016 /* Flow cache does not have reference, it dst_free()'s,
2017 * but we do need to return one reference for original caller */
2018 dst_hold(&new_xdst->u.dst);
2019 return &new_xdst->flo;
2020
2021make_dummy_bundle:
2022 /* We found policies, but there's no bundles to instantiate:
2023 * either because the policy blocks, has no transformations or
2024 * we could not build template (no xfrm_states).*/
a0073fe1 2025 xdst = xfrm_create_dummy_bundle(net, dst_orig, fl, num_xfrms, family);
80c802f3
TT		 2026 if (IS_ERR(xdst)) {
2027 xfrm_pols_put(pols, num_pols);
2028 return ERR_CAST(xdst);
2029 }
2030 xdst->num_pols = num_pols;
2031 xdst->num_xfrms = num_xfrms;
3e94c2dc 2032 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2033
2034 dst_hold(&xdst->u.dst);
2035 return &xdst->flo;
2036
2037inc_error:
2038 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2039error:
2040 if (xdst != NULL)
2041 dst_free(&xdst->u.dst);
2042 else
2043 xfrm_pols_put(pols, num_pols);
2044 return ERR_PTR(err);
2045}
1da177e4 2046
2774c131
DM		 2047static struct dst_entry *make_blackhole(struct net *net, u16 family,
2048 struct dst_entry *dst_orig)
2049{
2050 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2051 struct dst_entry *ret;
2052
2053 if (!afinfo) {
2054 dst_release(dst_orig);
433a1954 2055 return ERR_PTR(-EINVAL);
2774c131
DM		 2056 } else {
2057 ret = afinfo->blackhole_route(net, dst_orig);
2058 }
2059 xfrm_policy_put_afinfo(afinfo);
2060
2061 return ret;
2062}
2063
1da177e4
LT		 2064/* Main function: finds/creates a bundle for given flow.
2065 *
2066 * At the moment we eat a raw IP route. Mostly to speed up lookups
2067 * on interfaces with disabled IPsec.
2068 */
452edd59
DM		 2069struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2070 const struct flowi *fl,
2071 struct sock *sk, int flags)
1da177e4 2072{
4e81bb83 2073 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2074 struct flow_cache_object *flo;
2075 struct xfrm_dst *xdst;
452edd59 2076 struct dst_entry *dst, *route;
80c802f3 2077 u16 family = dst_orig->ops->family;
df71837d 2078 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2079 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2080
80c802f3
TT		 2081 dst = NULL;
2082 xdst = NULL;
2083 route = NULL;
4e81bb83 2084
f7944fb1 2085 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3
TT		 2086 num_pols = 1;
2087 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2088 err = xfrm_expand_policies(fl, family, pols,
2089 &num_pols, &num_xfrms);
2090 if (err < 0)
75b8c133 2091 goto dropdst;
80c802f3
TT		 2092
2093 if (num_pols) {
2094 if (num_xfrms <= 0) {
2095 drop_pols = num_pols;
2096 goto no_transform;
2097 }
2098
2099 xdst = xfrm_resolve_and_create_bundle(
2100 pols, num_pols, fl,
2101 family, dst_orig);
2102 if (IS_ERR(xdst)) {
2103 xfrm_pols_put(pols, num_pols);
2104 err = PTR_ERR(xdst);
2105 goto dropdst;
d809ec89
TT		 2106 } else if (xdst == NULL) {
2107 num_xfrms = 0;
2108 drop_pols = num_pols;
2109 goto no_transform;
80c802f3
TT		 2110 }
2111
fbd50608
SK		 2112 dst_hold(&xdst->u.dst);
2113
283bc9f3 2114 spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
80c802f3
TT		 2115 xdst->u.dst.next = xfrm_policy_sk_bundles;
2116 xfrm_policy_sk_bundles = &xdst->u.dst;
283bc9f3 2117 spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
80c802f3
TT		 2118
2119 route = xdst->route;
0aa64774 2120 }
3bccfbc7 2121 }
1da177e4 2122
80c802f3 2123 if (xdst == NULL) {
1da177e4 2124 /* To accelerate a bit... */
2518c7c2 2125 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2126 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2127 goto nopol;
1da177e4 2128
80c802f3
TT		 2129 flo = flow_cache_lookup(net, fl, family, dir,
2130 xfrm_bundle_lookup, dst_orig);
2131 if (flo == NULL)
2132 goto nopol;
fe1a5f03 2133 if (IS_ERR(flo)) {
80c802f3 2134 err = PTR_ERR(flo);
75b8c133 2135 goto dropdst;
d66e37a9 2136 }
80c802f3
TT		 2137 xdst = container_of(flo, struct xfrm_dst, flo);
2138
2139 num_pols = xdst->num_pols;
2140 num_xfrms = xdst->num_xfrms;
3e94c2dc 2141 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2142 route = xdst->route;
2143 }
2144
2145 dst = &xdst->u.dst;
2146 if (route == NULL && num_xfrms > 0) {
2147 /* The only case when xfrm_bundle_lookup() returns a
2148 * bundle with null route, is when the template could
2149 * not be resolved. It means policies are there, but
2150 * bundle could not be created, since we don't yet
2151 * have the xfrm_state's. We need to wait for KM to
2152 * negotiate new SA's or bail out with error.*/
2153 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2154 dst_release(dst);
a1aa3483 2155 xfrm_pols_put(pols, drop_pols);
80c802f3 2156 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2774c131 2157
452edd59 2158 return make_blackhole(net, family, dst_orig);
80c802f3 2159 }
80c802f3 2160
5b8ef341 2161 err = -EAGAIN;
80c802f3
TT		 2162
2163 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2164 goto error;
1da177e4
LT		 2165 }
2166
80c802f3
TT		 2167no_transform:
2168 if (num_pols == 0)
8b7817f3 2169 goto nopol;
1da177e4 2170
80c802f3
TT		 2171 if ((flags & XFRM_LOOKUP_ICMP) &&
2172 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2173 err = -ENOENT;
8b7817f3 2174 goto error;
80c802f3 2175 }
8b7817f3 2176
80c802f3
TT		 2177 for (i = 0; i < num_pols; i++)
2178 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2179
80c802f3 2180 if (num_xfrms < 0) {
1da177e4 2181 /* Prohibit the flow */
59c9940e 2182 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2183 err = -EPERM;
2184 goto error;
80c802f3
TT		 2185 } else if (num_xfrms > 0) {
2186 /* Flow transformed */
80c802f3
TT		 2187 dst_release(dst_orig);
2188 } else {
2189 /* Flow passes untransformed */
2190 dst_release(dst);
452edd59 2191 dst = dst_orig;
1da177e4 2192 }
80c802f3
TT		 2193ok:
2194 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2195 if (dst && dst->xfrm &&
2196 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2197 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2198 return dst;
1da177e4 2199
80c802f3 2200nopol:
452edd59
DM		 2201 if (!(flags & XFRM_LOOKUP_ICMP)) {
2202 dst = dst_orig;
80c802f3 2203 goto ok;
452edd59 2204 }
80c802f3 2205 err = -ENOENT;
1da177e4 2206error:
80c802f3 2207 dst_release(dst);
75b8c133
HX		 2208dropdst:
2209 dst_release(dst_orig);
80c802f3 2210 xfrm_pols_put(pols, drop_pols);
452edd59 2211 return ERR_PTR(err);
1da177e4
LT		 2212}
2213EXPORT_SYMBOL(xfrm_lookup);
2214
df0ba92a 2215static inline int
8f029de2 2216xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2217{
2218 struct xfrm_state *x;
df0ba92a
MN		 2219
2220 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2221 return 0;
2222 x = skb->sp->xvec[idx];
2223 if (!x->type->reject)
2224 return 0;
1ecafede 2225 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2226}
2227
1da177e4
LT		 2228/* When skb is transformed back to its "native" form, we have to
2229 * check policy restrictions. At the moment we make this in maximally
2230 * stupid way. Shame on me. :-) Of course, connected sockets must
2231 * have policy cached at them.
2232 */
2233
2234static inline int
7db454b9 2235xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2236 unsigned short family)
2237{
2238 if (xfrm_state_kern(x))
928ba416 2239 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2240 return x->id.proto == tmpl->id.proto &&
2241 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2242 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2243 x->props.mode == tmpl->mode &&
c5d18e98 2244 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2245 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2246 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2247 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2248}
2249
df0ba92a
MN		 2250/*
2251 * 0 or more than 0 is returned when validation is succeeded (either bypass
2252 * because of optional transport mode, or next index of the mathced secpath
2253 * state with the template.
2254 * -1 is returned when no matching template is found.
2255 * Otherwise "-2 - errored_index" is returned.
2256 */
1da177e4 2257static inline int
22cccb7e 2258xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2259 unsigned short family)
2260{
2261 int idx = start;
2262
2263 if (tmpl->optional) {
7e49e6de 2264 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2265 return start;
2266 } else
2267 start = -1;
2268 for (; idx < sp->len; idx++) {
dbe5b4aa 2269 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2270 return ++idx;
df0ba92a
MN		 2271 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2272 if (start == -1)
2273 start = -2-idx;
1da177e4 2274 break;
df0ba92a 2275 }
1da177e4
LT		 2276 }
2277 return start;
2278}
2279
d5422efe
HX		 2280int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2281 unsigned int family, int reverse)
1da177e4
LT		 2282{
2283 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2284 int err;
1da177e4
LT		 2285
2286 if (unlikely(afinfo == NULL))
2287 return -EAFNOSUPPORT;
2288
d5422efe 2289 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2290 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
1da177e4 2291 xfrm_policy_put_afinfo(afinfo);
e0d1caa7 2292 return err;
1da177e4 2293}
d5422efe 2294EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2295
9a7386ec 2296static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2297{
2298 for (; k < sp->len; k++) {
df0ba92a 2299 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2300 *idxp = k;
1da177e4 2301 return 1;
df0ba92a 2302 }
1da177e4
LT		 2303 }
2304
2305 return 0;
2306}
2307
a716c119 2308int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2309 unsigned short family)
2310{
f6e1e25d 2311 struct net *net = dev_net(skb->dev);
1da177e4 2312 struct xfrm_policy *pol;
4e81bb83
MN		 2313 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2314 int npols = 0;
2315 int xfrm_nr;
2316 int pi;
d5422efe 2317 int reverse;
1da177e4 2318 struct flowi fl;
d5422efe 2319 u8 fl_dir;
df0ba92a 2320 int xerr_idx = -1;
1da177e4 2321
d5422efe
HX		 2322 reverse = dir & ~XFRM_POLICY_MASK;
2323 dir &= XFRM_POLICY_MASK;
2324 fl_dir = policy_to_flow_dir(dir);
2325
0aa64774 2326 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2327 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2328 return 0;
0aa64774
MN		 2329 }
2330
eb9c7ebe 2331 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2332
2333 /* First, check used SA against their selectors. */
2334 if (skb->sp) {
2335 int i;
2336
9b7a787d 2337 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2338 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2339 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2340 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2341 return 0;
0aa64774 2342 }
1da177e4
LT		 2343 }
2344 }
2345
2346 pol = NULL;
3bccfbc7 2347 if (sk && sk->sk_policy[dir]) {
e0d1caa7 2348 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
0aa64774 2349 if (IS_ERR(pol)) {
59c9940e 2350 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2351 return 0;
0aa64774 2352 }
3bccfbc7 2353 }
1da177e4 2354
fe1a5f03
TT		 2355 if (!pol) {
2356 struct flow_cache_object *flo;
2357
2358 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2359 xfrm_policy_lookup, NULL);
2360 if (IS_ERR_OR_NULL(flo))
2361 pol = ERR_CAST(flo);
2362 else
2363 pol = container_of(flo, struct xfrm_policy, flo);
2364 }
1da177e4 2365
0aa64774 2366 if (IS_ERR(pol)) {
59c9940e 2367 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2368 return 0;
0aa64774 2369 }
134b0fc5 2370
df0ba92a 2371 if (!pol) {
d1d9facf 2372 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2373 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2374 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2375 return 0;
2376 }
2377 return 1;
2378 }
1da177e4 2379
9d729f72 2380 pol->curlft.use_time = get_seconds();
1da177e4 2381
4e81bb83 2382 pols[0] = pol;
02d0892f 2383 npols++;
4e81bb83
MN		 2384#ifdef CONFIG_XFRM_SUB_POLICY
2385 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2386 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2387 &fl, family,
2388 XFRM_POLICY_IN);
2389 if (pols[1]) {
0aa64774 2390 if (IS_ERR(pols[1])) {
59c9940e 2391 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2392 return 0;
0aa64774 2393 }
9d729f72 2394 pols[1]->curlft.use_time = get_seconds();
02d0892f 2395 npols++;
4e81bb83
MN		 2396 }
2397 }
2398#endif
2399
1da177e4
LT		 2400 if (pol->action == XFRM_POLICY_ALLOW) {
2401 struct sec_path *sp;
2402 static struct sec_path dummy;
4e81bb83 2403 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2404 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2405 struct xfrm_tmpl **tpp = tp;
2406 int ti = 0;
1da177e4
LT		 2407 int i, k;
2408
2409 if ((sp = skb->sp) == NULL)
2410 sp = &dummy;
2411
4e81bb83
MN		 2412 for (pi = 0; pi < npols; pi++) {
2413 if (pols[pi] != pol &&
0aa64774 2414 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2415 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2416 goto reject;
0aa64774
MN		 2417 }
2418 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2419 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2420 goto reject_error;
0aa64774 2421 }
4e81bb83
MN		 2422 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2423 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2424 }
2425 xfrm_nr = ti;
41a49cc3 2426 if (npols > 1) {
283bc9f3 2427 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2428 tpp = stp;
2429 }
4e81bb83 2430
1da177e4
LT		 2431 /* For each tunnel xfrm, find the first matching tmpl.
2432 * For each tmpl before that, find corresponding xfrm.
2433 * Order is _important_. Later we will implement
2434 * some barriers, but at the moment barriers
2435 * are implied between each two transformations.
2436 */
4e81bb83
MN		 2437 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2438 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2439 if (k < 0) {
d1d9facf
JM		 2440 if (k < -1)
2441 /* "-2 - errored_index" returned */
2442 xerr_idx = -(2+k);
59c9940e 2443 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2444 goto reject;
df0ba92a 2445 }
1da177e4
LT		 2446 }
2447
0aa64774 2448 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2449 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2450 goto reject;
0aa64774 2451 }
1da177e4 2452
4e81bb83 2453 xfrm_pols_put(pols, npols);
1da177e4
LT		 2454 return 1;
2455 }
59c9940e 2456 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2457
2458reject:
df0ba92a 2459 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2460reject_error:
2461 xfrm_pols_put(pols, npols);
1da177e4
LT		 2462 return 0;
2463}
2464EXPORT_SYMBOL(__xfrm_policy_check);
2465
2466int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2467{
99a66657 2468 struct net *net = dev_net(skb->dev);
1da177e4 2469 struct flowi fl;
adf30907 2470 struct dst_entry *dst;
73137147 2471 int res = 1;
1da177e4 2472
0aa64774 2473 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2474 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2475 return 0;
0aa64774 2476 }
1da177e4 2477
fafeeb6c 2478 skb_dst_force(skb);
adf30907 2479
452edd59
DM		 2480 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2481 if (IS_ERR(dst)) {
73137147 2482 res = 0;
452edd59
DM		 2483 dst = NULL;
2484 }
adf30907
ED		 2485 skb_dst_set(skb, dst);
2486 return res;
1da177e4
LT		 2487}
2488EXPORT_SYMBOL(__xfrm_route_forward);
2489
d49c73c7
DM		 2490/* Optimize later using cookies and generation ids. */
2491
1da177e4
LT		 2492static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2493{
d49c73c7 2494 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2495 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2496 * get validated by dst_ops->check on every use. We do this
2497 * because when a normal route referenced by an XFRM dst is
2498 * obsoleted we do not go looking around for all parent
2499 * referencing XFRM dsts so that we can invalidate them. It
2500 * is just too much work. Instead we make the checks here on
2501 * every use. For example:
d49c73c7
DM		 2502 *
2503 * XFRM dst A --> IPv4 dst X
2504 *
2505 * X is the "xdst->route" of A (X is also the "dst->path" of A
2506 * in this example). If X is marked obsolete, "A" will not
2507 * notice. That's what we are validating here via the
2508 * stale_bundle() check.
2509 *
2510 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2511 * dst which causes it's ->obsolete field to be set to
2512 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2513 * this, we want to force a new route lookup.
399c180a 2514 */
d49c73c7
DM		 2515 if (dst->obsolete < 0 && !stale_bundle(dst))
2516 return dst;
2517
1da177e4
LT		 2518 return NULL;
2519}
2520
2521static int stale_bundle(struct dst_entry *dst)
2522{
12fdb4d3 2523 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2524}
2525
aabc9761 2526void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2527{
1da177e4 2528 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2529 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2530 dev_hold(dst->dev);
1da177e4
LT		 2531 dev_put(dev);
2532 }
2533}
aabc9761 2534EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2535
2536static void xfrm_link_failure(struct sk_buff *skb)
2537{
2538 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2539}
2540
2541static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2542{
2543 if (dst) {
2544 if (dst->obsolete) {
2545 dst_release(dst);
2546 dst = NULL;
2547 }
2548 }
2549 return dst;
2550}
2551
80c802f3 2552static void __xfrm_garbage_collect(struct net *net)
1da177e4 2553{
80c802f3 2554 struct dst_entry *head, *next;
1da177e4 2555
283bc9f3 2556 spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
80c802f3
TT		 2557 head = xfrm_policy_sk_bundles;
2558 xfrm_policy_sk_bundles = NULL;
283bc9f3 2559 spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
2518c7c2 2560
80c802f3
TT		 2561 while (head) {
2562 next = head->next;
2563 dst_free(head);
2564 head = next;
1da177e4
LT		 2565 }
2566}
2567
e4c17216 2568void xfrm_garbage_collect(struct net *net)
c0ed1c14
SK		 2569{
2570 flow_cache_flush();
2571 __xfrm_garbage_collect(net);
2572}
e4c17216 2573EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14
SK		 2574
2575static void xfrm_garbage_collect_deferred(struct net *net)
2576{
2577 flow_cache_flush_deferred();
2578 __xfrm_garbage_collect(net);
2579}
2580
25ee3286 2581static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2582{
2583 do {
2584 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2585 u32 pmtu, route_mtu_cached;
2586
2587 pmtu = dst_mtu(dst->child);
2588 xdst->child_mtu_cached = pmtu;
2589
2590 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2591
2592 route_mtu_cached = dst_mtu(xdst->route);
2593 xdst->route_mtu_cached = route_mtu_cached;
2594
2595 if (pmtu > route_mtu_cached)
2596 pmtu = route_mtu_cached;
2597
defb3519 2598 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2599 } while ((dst = dst->next));
2600}
2601
1da177e4
LT		 2602/* Check that the bundle accepts the flow and its components are
2603 * still valid.
2604 */
2605
12fdb4d3 2606static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2607{
2608 struct dst_entry *dst = &first->u.dst;
2609 struct xfrm_dst *last;
2610 u32 mtu;
2611
92d63dec 2612 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2613 (dst->dev && !netif_running(dst->dev)))
2614 return 0;
2615
a0073fe1
SK		 2616 if (dst->flags & DST_XFRM_QUEUE)
2617 return 1;
2618
1da177e4
LT		 2619 last = NULL;
2620
2621 do {
2622 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2623
1da177e4
LT		 2624 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2625 return 0;
80c802f3
TT		 2626 if (xdst->xfrm_genid != dst->xfrm->genid)
2627 return 0;
b1312c89
TT		 2628 if (xdst->num_pols > 0 &&
2629 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2630 return 0;
e53820de 2631
1da177e4
LT		 2632 mtu = dst_mtu(dst->child);
2633 if (xdst->child_mtu_cached != mtu) {
2634 last = xdst;
2635 xdst->child_mtu_cached = mtu;
2636 }
2637
92d63dec 2638 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2639 return 0;
2640 mtu = dst_mtu(xdst->route);
2641 if (xdst->route_mtu_cached != mtu) {
2642 last = xdst;
2643 xdst->route_mtu_cached = mtu;
2644 }
2645
2646 dst = dst->child;
2647 } while (dst->xfrm);
2648
2649 if (likely(!last))
2650 return 1;
2651
2652 mtu = last->child_mtu_cached;
2653 for (;;) {
2654 dst = &last->u.dst;
2655
2656 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2657 if (mtu > last->route_mtu_cached)
2658 mtu = last->route_mtu_cached;
defb3519 2659 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2660
2661 if (last == first)
2662 break;
2663
bd0bf076 2664 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2665 last->child_mtu_cached = mtu;
2666 }
2667
2668 return 1;
2669}
2670
0dbaee3b
DM		 2671static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2672{
2673 return dst_metric_advmss(dst->path);
2674}
2675
ebb762f2 2676static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2677{
618f9bc7
SK		 2678 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2679
2680 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2681}
2682
f894cbf8
DM		 2683static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2684 struct sk_buff *skb,
2685 const void *daddr)
d3aaeb38 2686{
f894cbf8 2687 return dst->path->ops->neigh_lookup(dst, skb, daddr);
d3aaeb38
DM		 2688}
2689
1da177e4
LT		 2690int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2691{
d7c7544c 2692 struct net *net;
1da177e4
LT		 2693 int err = 0;
2694 if (unlikely(afinfo == NULL))
2695 return -EINVAL;
2696 if (unlikely(afinfo->family >= NPROTO))
2697 return -EAFNOSUPPORT;
ef8531b6 2698 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4
LT		 2699 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2700 err = -ENOBUFS;
2701 else {
2702 struct dst_ops *dst_ops = afinfo->dst_ops;
2703 if (likely(dst_ops->kmem_cachep == NULL))
2704 dst_ops->kmem_cachep = xfrm_dst_cache;
2705 if (likely(dst_ops->check == NULL))
2706 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2707 if (likely(dst_ops->default_advmss == NULL))
2708 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2709 if (likely(dst_ops->mtu == NULL))
2710 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2711 if (likely(dst_ops->negative_advice == NULL))
2712 dst_ops->negative_advice = xfrm_negative_advice;
2713 if (likely(dst_ops->link_failure == NULL))
2714 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2715 if (likely(dst_ops->neigh_lookup == NULL))
2716 dst_ops->neigh_lookup = xfrm_neigh_lookup;
1da177e4 2717 if (likely(afinfo->garbage_collect == NULL))
c0ed1c14 2718 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
418a99ac 2719 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
1da177e4 2720 }
ef8531b6 2721 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c
AD		 2722
2723 rtnl_lock();
2724 for_each_net(net) {
2725 struct dst_ops *xfrm_dst_ops;
2726
2727 switch (afinfo->family) {
2728 case AF_INET:
2729 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2730 break;
dfd56b8b 2731#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 2732 case AF_INET6:
2733 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2734 break;
2735#endif
2736 default:
2737 BUG();
2738 }
2739 *xfrm_dst_ops = *afinfo->dst_ops;
2740 }
2741 rtnl_unlock();
2742
1da177e4
LT		 2743 return err;
2744}
2745EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2746
2747int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2748{
2749 int err = 0;
2750 if (unlikely(afinfo == NULL))
2751 return -EINVAL;
2752 if (unlikely(afinfo->family >= NPROTO))
2753 return -EAFNOSUPPORT;
ef8531b6 2754 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4
LT		 2755 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2756 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2757 err = -EINVAL;
ef8531b6
ED		 2758 else
2759 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2760 NULL);
2761 }
2762 spin_unlock(&xfrm_policy_afinfo_lock);
2763 if (!err) {
2764 struct dst_ops *dst_ops = afinfo->dst_ops;
2765
2766 synchronize_rcu();
2767
2768 dst_ops->kmem_cachep = NULL;
2769 dst_ops->check = NULL;
2770 dst_ops->negative_advice = NULL;
2771 dst_ops->link_failure = NULL;
2772 afinfo->garbage_collect = NULL;
1da177e4 2773 }
1da177e4
LT		 2774 return err;
2775}
2776EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2777
d7c7544c
AD		 2778static void __net_init xfrm_dst_ops_init(struct net *net)
2779{
2780 struct xfrm_policy_afinfo *afinfo;
2781
ef8531b6
ED		 2782 rcu_read_lock();
2783 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
d7c7544c
AD		 2784 if (afinfo)
2785 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
dfd56b8b 2786#if IS_ENABLED(CONFIG_IPV6)
ef8531b6 2787 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
d7c7544c
AD		 2788 if (afinfo)
2789 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2790#endif
418a99ac 2791 rcu_read_unlock();
546be240
HX		 2792}
2793
1da177e4
LT		 2794static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2795{
351638e7 2796 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
e9dc8653 2797
1da177e4
LT		 2798 switch (event) {
2799 case NETDEV_DOWN:
c0ed1c14 2800 xfrm_garbage_collect(dev_net(dev));
1da177e4
LT		 2801 }
2802 return NOTIFY_DONE;
2803}
2804
2805static struct notifier_block xfrm_dev_notifier = {
d5917a35 2806 .notifier_call = xfrm_dev_event,
1da177e4
LT		 2807};
2808
558f82ef 2809#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2810static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2811{
c68cd1a0
AD		 2812 int rv;
2813
7d720c3e 2814 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
1823e4c8
ED		 2815 sizeof(struct linux_xfrm_mib),
2816 __alignof__(struct linux_xfrm_mib)) < 0)
558f82ef 2817 return -ENOMEM;
c68cd1a0
AD		 2818 rv = xfrm_proc_init(net);
2819 if (rv < 0)
7d720c3e 2820 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
c68cd1a0 2821 return rv;
558f82ef 2822}
59c9940e
AD		 2823
2824static void xfrm_statistics_fini(struct net *net)
2825{
c68cd1a0 2826 xfrm_proc_fini(net);
7d720c3e 2827 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
59c9940e
AD		 2828}
2829#else
2830static int __net_init xfrm_statistics_init(struct net *net)
2831{
2832 return 0;
2833}
2834
2835static void xfrm_statistics_fini(struct net *net)
2836{
2837}
558f82ef
MN		 2838#endif
2839
d62ddc21 2840static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2841{
2518c7c2
DM		 2842 unsigned int hmask, sz;
2843 int dir;
2844
d62ddc21
AD		 2845 if (net_eq(net, &init_net))
2846 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2847 sizeof(struct xfrm_dst),
e5d679f3 2848 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2849 NULL);
1da177e4 2850
2518c7c2
DM		 2851 hmask = 8 - 1;
2852 sz = (hmask+1) * sizeof(struct hlist_head);
2853
93b851c1
AD		 2854 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2855 if (!net->xfrm.policy_byidx)
2856 goto out_byidx;
8100bea7 2857 net->xfrm.policy_idx_hmask = hmask;
2518c7c2
DM		 2858
2859 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2860 struct xfrm_policy_hash *htab;
2861
dc2caba7 2862 net->xfrm.policy_count[dir] = 0;
8b18f8ea 2863 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 2864
a35f6c5d 2865 htab = &net->xfrm.policy_bydst[dir];
44e36b42 2866 htab->table = xfrm_hash_alloc(sz);
2518c7c2 2867 if (!htab->table)
a35f6c5d
AD		 2868 goto out_bydst;
2869 htab->hmask = hmask;
2518c7c2
DM		 2870 }
2871
adfcf0b2 2872 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 2873 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
d62ddc21
AD		 2874 if (net_eq(net, &init_net))
2875 register_netdevice_notifier(&xfrm_dev_notifier);
2876 return 0;
93b851c1 2877
a35f6c5d
AD		 2878out_bydst:
2879 for (dir--; dir >= 0; dir--) {
2880 struct xfrm_policy_hash *htab;
2881
2882 htab = &net->xfrm.policy_bydst[dir];
2883 xfrm_hash_free(htab->table, sz);
2884 }
2885 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 2886out_byidx:
2887 return -ENOMEM;
d62ddc21
AD		 2888}
2889
2890static void xfrm_policy_fini(struct net *net)
2891{
7c2776ee 2892 struct xfrm_audit audit_info;
93b851c1 2893 unsigned int sz;
8b18f8ea 2894 int dir;
93b851c1 2895
7c2776ee
AD		 2896 flush_work(&net->xfrm.policy_hash_work);
2897#ifdef CONFIG_XFRM_SUB_POLICY
e1760bd5 2898 audit_info.loginuid = INVALID_UID;
4440e854 2899 audit_info.sessionid = (unsigned int)-1;
7c2776ee
AD		 2900 audit_info.secid = 0;
2901 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2902#endif
e1760bd5 2903 audit_info.loginuid = INVALID_UID;
4440e854 2904 audit_info.sessionid = (unsigned int)-1;
7c2776ee
AD		 2905 audit_info.secid = 0;
2906 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
7c2776ee 2907
adfcf0b2 2908 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 2909
8b18f8ea 2910 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
a35f6c5d
AD		 2911 struct xfrm_policy_hash *htab;
2912
8b18f8ea 2913 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 2914
2915 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 2916 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 2917 WARN_ON(!hlist_empty(htab->table));
2918 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 2919 }
2920
8100bea7 2921 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 2922 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2923 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 2924}
2925
d62ddc21
AD		 2926static int __net_init xfrm_net_init(struct net *net)
2927{
2928 int rv;
2929
59c9940e
AD		 2930 rv = xfrm_statistics_init(net);
2931 if (rv < 0)
2932 goto out_statistics;
d62ddc21
AD		 2933 rv = xfrm_state_init(net);
2934 if (rv < 0)
2935 goto out_state;
2936 rv = xfrm_policy_init(net);
2937 if (rv < 0)
2938 goto out_policy;
d7c7544c 2939 xfrm_dst_ops_init(net);
b27aeadb
AD		 2940 rv = xfrm_sysctl_init(net);
2941 if (rv < 0)
2942 goto out_sysctl;
283bc9f3
FD		 2943
2944 /* Initialize the per-net locks here */
2945 spin_lock_init(&net->xfrm.xfrm_state_lock);
2946 rwlock_init(&net->xfrm.xfrm_policy_lock);
2947 spin_lock_init(&net->xfrm.xfrm_policy_sk_bundle_lock);
2948 mutex_init(&net->xfrm.xfrm_cfg_mutex);
2949
d62ddc21
AD		 2950 return 0;
2951
b27aeadb
AD		 2952out_sysctl:
2953 xfrm_policy_fini(net);
d62ddc21
AD		 2954out_policy:
2955 xfrm_state_fini(net);
2956out_state:
59c9940e
AD		 2957 xfrm_statistics_fini(net);
2958out_statistics:
d62ddc21
AD		 2959 return rv;
2960}
2961
2962static void __net_exit xfrm_net_exit(struct net *net)
2963{
b27aeadb 2964 xfrm_sysctl_fini(net);
d62ddc21
AD		 2965 xfrm_policy_fini(net);
2966 xfrm_state_fini(net);
59c9940e 2967 xfrm_statistics_fini(net);
d62ddc21
AD		 2968}
2969
2970static struct pernet_operations __net_initdata xfrm_net_ops = {
2971 .init = xfrm_net_init,
2972 .exit = xfrm_net_exit,
2973};
2974
1da177e4
LT		 2975void __init xfrm_init(void)
2976{
d62ddc21 2977 register_pernet_subsys(&xfrm_net_ops);
1da177e4
LT		 2978 xfrm_input_init();
2979}
2980
ab5f5e8b 2981#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 2982static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2983 struct audit_buffer *audit_buf)
ab5f5e8b 2984{
875179fa
PM		 2985 struct xfrm_sec_ctx *ctx = xp->security;
2986 struct xfrm_selector *sel = &xp->selector;
2987
2988 if (ctx)
ab5f5e8b 2989 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 2990 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2991
9b7a787d 2992 switch (sel->family) {
ab5f5e8b 2993 case AF_INET:
21454aaa 2994 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 2995 if (sel->prefixlen_s != 32)
2996 audit_log_format(audit_buf, " src_prefixlen=%d",
2997 sel->prefixlen_s);
21454aaa 2998 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 2999 if (sel->prefixlen_d != 32)
3000 audit_log_format(audit_buf, " dst_prefixlen=%d",
3001 sel->prefixlen_d);
ab5f5e8b
JL		 3002 break;
3003 case AF_INET6:
5b095d98 3004 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 3005 if (sel->prefixlen_s != 128)
3006 audit_log_format(audit_buf, " src_prefixlen=%d",
3007 sel->prefixlen_s);
5b095d98 3008 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 3009 if (sel->prefixlen_d != 128)
3010 audit_log_format(audit_buf, " dst_prefixlen=%d",
3011 sel->prefixlen_d);
ab5f5e8b
JL		 3012 break;
3013 }
3014}
3015
68277acc 3016void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
4440e854 3017 kuid_t auid, unsigned int sessionid, u32 secid)
ab5f5e8b
JL		 3018{
3019 struct audit_buffer *audit_buf;
ab5f5e8b 3020
afeb14b4 3021 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 3022 if (audit_buf == NULL)
3023 return;
2532386f 3024 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 3025 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3026 xfrm_audit_common_policyinfo(xp, audit_buf);
3027 audit_log_end(audit_buf);
3028}
3029EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3030
68277acc 3031void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
4440e854 3032 kuid_t auid, unsigned int sessionid, u32 secid)
ab5f5e8b
JL		 3033{
3034 struct audit_buffer *audit_buf;
ab5f5e8b 3035
afeb14b4 3036 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3037 if (audit_buf == NULL)
3038 return;
2532386f 3039 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 3040 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3041 xfrm_audit_common_policyinfo(xp, audit_buf);
3042 audit_log_end(audit_buf);
3043}
3044EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3045#endif
3046
80c9abaa 3047#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3048static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3049 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3050{
3051 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3052 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3053 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3054 sel_cmp->family) &&
3055 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3056 sel_cmp->family) &&
80c9abaa
SS		 3057 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3058 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3059 return true;
80c9abaa
SS		 3060 }
3061 } else {
3062 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3063 return true;
80c9abaa
SS		 3064 }
3065 }
bc9b35ad 3066 return false;
80c9abaa
SS		 3067}
3068
3e94c2dc
WC		 3069static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3070 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3071{
3072 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3073 struct hlist_head *chain;
3074 u32 priority = ~0U;
3075
283bc9f3 3076 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
8d549c4f 3077 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3078 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3079 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3080 pol->type == type) {
3081 ret = pol;
3082 priority = ret->priority;
3083 break;
3084 }
3085 }
8d549c4f 3086 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3087 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3088 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3089 pol->type == type &&
3090 pol->priority < priority) {
3091 ret = pol;
3092 break;
3093 }
3094 }
3095
3096 if (ret)
3097 xfrm_pol_hold(ret);
3098
283bc9f3 3099 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3100
3101 return ret;
3102}
3103
dd701754 3104static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3105{
3106 int match = 0;
3107
3108 if (t->mode == m->mode && t->id.proto == m->proto &&
3109 (m->reqid == 0 || t->reqid == m->reqid)) {
3110 switch (t->mode) {
3111 case XFRM_MODE_TUNNEL:
3112 case XFRM_MODE_BEET:
70e94e66
YH		 3113 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3114 m->old_family) &&
3115 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3116 m->old_family)) {
80c9abaa
SS		 3117 match = 1;
3118 }
3119 break;
3120 case XFRM_MODE_TRANSPORT:
3121 /* in case of transport mode, template does not store
3122 any IP addresses, hence we just compare mode and
3123 protocol */
3124 match = 1;
3125 break;
3126 default:
3127 break;
3128 }
3129 }
3130 return match;
3131}
3132
3133/* update endpoint address(es) of template(s) */
3134static int xfrm_policy_migrate(struct xfrm_policy *pol,
3135 struct xfrm_migrate *m, int num_migrate)
3136{
3137 struct xfrm_migrate *mp;
80c9abaa
SS		 3138 int i, j, n = 0;
3139
3140 write_lock_bh(&pol->lock);
12a169e7 3141 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3142 /* target policy has been deleted */
3143 write_unlock_bh(&pol->lock);
3144 return -ENOENT;
3145 }
3146
3147 for (i = 0; i < pol->xfrm_nr; i++) {
3148 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3149 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3150 continue;
3151 n++;
1bfcb10f
HX		 3152 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3153 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3154 continue;
3155 /* update endpoints */
3156 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3157 sizeof(pol->xfrm_vec[i].id.daddr));
3158 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3159 sizeof(pol->xfrm_vec[i].saddr));
3160 pol->xfrm_vec[i].encap_family = mp->new_family;
3161 /* flush bundles */
80c802f3 3162 atomic_inc(&pol->genid);
80c9abaa
SS		 3163 }
3164 }
3165
3166 write_unlock_bh(&pol->lock);
3167
3168 if (!n)
3169 return -ENODATA;
3170
3171 return 0;
3172}
3173
dd701754 3174static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3175{
3176 int i, j;
3177
3178 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3179 return -EINVAL;
3180
3181 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3182 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3183 m[i].old_family) &&
3184 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3185 m[i].old_family))
80c9abaa
SS		 3186 return -EINVAL;
3187 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3188 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3189 return -EINVAL;
3190
3191 /* check if there is any duplicated entry */
3192 for (j = i + 1; j < num_migrate; j++) {
3193 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3194 sizeof(m[i].old_daddr)) &&
3195 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3196 sizeof(m[i].old_saddr)) &&
3197 m[i].proto == m[j].proto &&
3198 m[i].mode == m[j].mode &&
3199 m[i].reqid == m[j].reqid &&
3200 m[i].old_family == m[j].old_family)
3201 return -EINVAL;
3202 }
3203 }
3204
3205 return 0;
3206}
3207
b4b7c0b3 3208int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3209 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3210 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3211{
3212 int i, err, nx_cur = 0, nx_new = 0;
3213 struct xfrm_policy *pol = NULL;
3214 struct xfrm_state *x, *xc;
3215 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3216 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3217 struct xfrm_migrate *mp;
3218
3219 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3220 goto out;
3221
3222 /* Stage 1 - find policy */
8d549c4f 3223 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3224 err = -ENOENT;
3225 goto out;
3226 }
3227
3228 /* Stage 2 - find and update state(s) */
3229 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3230 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3231 x_cur[nx_cur] = x;
3232 nx_cur++;
3233 if ((xc = xfrm_state_migrate(x, mp))) {
3234 x_new[nx_new] = xc;
3235 nx_new++;
3236 } else {
3237 err = -ENODATA;
3238 goto restore_state;
3239 }
3240 }
3241 }
3242
3243 /* Stage 3 - update policy */
3244 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3245 goto restore_state;
3246
3247 /* Stage 4 - delete old state(s) */
3248 if (nx_cur) {
3249 xfrm_states_put(x_cur, nx_cur);
3250 xfrm_states_delete(x_cur, nx_cur);
3251 }
3252
3253 /* Stage 5 - announce */
13c1d189 3254 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3255
3256 xfrm_pol_put(pol);
3257
3258 return 0;
3259out:
3260 return err;
3261
3262restore_state:
3263 if (pol)
3264 xfrm_pol_put(pol);
3265 if (nx_cur)
3266 xfrm_states_put(x_cur, nx_cur);
3267 if (nx_new)
3268 xfrm_states_delete(x_new, nx_new);
3269
3270 return err;
3271}
e610e679 3272EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3273#endif
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