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Merge tag 'kvm-x86-mmu-6.7' of https://github.com/kvm-x86/linux into HEAD
[thirdparty/kernel/stable.git] / net / xfrm / xfrm_policy.c
CommitLineData
457c8996 1// SPDX-License-Identifier: GPL-2.0-only
a716c119 2/*
1da177e4
LT		 3 * xfrm_policy.c
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 * Kazunori MIYAZAWA @USAGI
11 * YOSHIFUJI Hideaki
12 * Split up af-specific portion
13 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
df71837d 14 *
1da177e4
LT		 15 */
16
66cdb3ca 17#include <linux/err.h>
1da177e4
LT		 18#include <linux/slab.h>
19#include <linux/kmod.h>
20#include <linux/list.h>
21#include <linux/spinlock.h>
22#include <linux/workqueue.h>
23#include <linux/notifier.h>
24#include <linux/netdevice.h>
eb9c7ebe 25#include <linux/netfilter.h>
1da177e4 26#include <linux/module.h>
2518c7c2 27#include <linux/cache.h>
ec30d78c 28#include <linux/cpu.h>
68277acc 29#include <linux/audit.h>
24969fac 30#include <linux/rhashtable.h>
c53ac41e 31#include <linux/if_tunnel.h>
25ee3286 32#include <net/dst.h>
6ce74ec7 33#include <net/flow.h>
23e7b1bf 34#include <net/inet_ecn.h>
1da177e4
LT		 35#include <net/xfrm.h>
36#include <net/ip.h>
bcf141b2 37#include <net/gre.h>
c53ac41e
FW		 38#if IS_ENABLED(CONFIG_IPV6_MIP6)
39#include <net/mip6.h>
40#endif
558f82ef
MN		 41#ifdef CONFIG_XFRM_STATISTICS
42#include <net/snmp.h>
43#endif
95a35b42 44#ifdef CONFIG_XFRM_ESPINTCP
e27cca96
SD		 45#include <net/espintcp.h>
46#endif
1da177e4 47
44e36b42
DM		 48#include "xfrm_hash.h"
49
a0073fe1
SK		 50#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
51#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
52#define XFRM_MAX_QUEUE_LEN 100
53
b8c203b2
SK		 54struct xfrm_flo {
55 struct dst_entry *dst_orig;
56 u8 flags;
57};
58
6be3b0db
FW		 59/* prefixes smaller than this are stored in lists, not trees. */
60#define INEXACT_PREFIXLEN_IPV4 16
61#define INEXACT_PREFIXLEN_IPV6 48
9cf545eb
FW		 62
63struct xfrm_pol_inexact_node {
64 struct rb_node node;
65 union {
66 xfrm_address_t addr;
67 struct rcu_head rcu;
68 };
69 u8 prefixlen;
70
6ac098b2
FW		 71 struct rb_root root;
72
9cf545eb
FW		 73 /* the policies matching this node, can be empty list */
74 struct hlist_head hhead;
75};
76
77/* xfrm inexact policy search tree:
78 * xfrm_pol_inexact_bin = hash(dir,type,family,if_id);
79 * |
80 * +---- root_d: sorted by daddr:prefix
81 * | |
82 * | xfrm_pol_inexact_node
83 * | |
6ac098b2
FW		 84 * | +- root: sorted by saddr/prefix
85 * | | |
86 * | | xfrm_pol_inexact_node
87 * | | |
88 * | | + root: unused
89 * | | |
90 * | | + hhead: saddr:daddr policies
91 * | |
9cf545eb
FW		 92 * | +- coarse policies and all any:daddr policies
93 * |
64a09a7b
FW		 94 * +---- root_s: sorted by saddr:prefix
95 * | |
96 * | xfrm_pol_inexact_node
97 * | |
98 * | + root: unused
99 * | |
100 * | + hhead: saddr:any policies
101 * |
9cf545eb
FW		 102 * +---- coarse policies and all any:any policies
103 *
6ac098b2 104 * Lookups return four candidate lists:
9cf545eb
FW		 105 * 1. any:any list from top-level xfrm_pol_inexact_bin
106 * 2. any:daddr list from daddr tree
6ac098b2
FW		 107 * 3. saddr:daddr list from 2nd level daddr tree
108 * 4. saddr:any list from saddr tree
9cf545eb
FW		 109 *
110 * This result set then needs to be searched for the policy with
111 * the lowest priority. If two results have same prio, youngest one wins.
112 */
113
24969fac
FW		 114struct xfrm_pol_inexact_key {
115 possible_net_t net;
b5fe22e2 116 u32 if_id;
24969fac
FW		 117 u16 family;
118 u8 dir, type;
119};
120
121struct xfrm_pol_inexact_bin {
122 struct xfrm_pol_inexact_key k;
123 struct rhash_head head;
6be3b0db 124 /* list containing '*:*' policies */
24969fac
FW		 125 struct hlist_head hhead;
126
77cc278f 127 seqcount_spinlock_t count;
9cf545eb
FW		 128 /* tree sorted by daddr/prefix */
129 struct rb_root root_d;
130
64a09a7b
FW		 131 /* tree sorted by saddr/prefix */
132 struct rb_root root_s;
133
24969fac
FW		 134 /* slow path below */
135 struct list_head inexact_bins;
136 struct rcu_head rcu;
137};
138
6be3b0db 139enum xfrm_pol_inexact_candidate_type {
6ac098b2 140 XFRM_POL_CAND_BOTH,
64a09a7b 141 XFRM_POL_CAND_SADDR,
9cf545eb 142 XFRM_POL_CAND_DADDR,
6be3b0db
FW		 143 XFRM_POL_CAND_ANY,
144
145 XFRM_POL_CAND_MAX,
146};
147
148struct xfrm_pol_inexact_candidates {
149 struct hlist_head *res[XFRM_POL_CAND_MAX];
150};
151
f203b76d
SK		 152static DEFINE_SPINLOCK(xfrm_if_cb_lock);
153static struct xfrm_if_cb const __rcu *xfrm_if_cb __read_mostly;
154
418a99ac 155static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
37b10383 156static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
418a99ac 157 __read_mostly;
1da177e4 158
f8c3d0dd 159static struct kmem_cache *xfrm_dst_cache __ro_after_init;
1da177e4 160
24969fac
FW		 161static struct rhashtable xfrm_policy_inexact_table;
162static const struct rhashtable_params xfrm_pol_inexact_params;
163
5492093d 164static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr);
80c802f3 165static int stale_bundle(struct dst_entry *dst);
12fdb4d3 166static int xfrm_bundle_ok(struct xfrm_dst *xdst);
c3aed709 167static void xfrm_policy_queue_process(struct timer_list *t);
1da177e4 168
12bfa8bd 169static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
29fa0b30
WY		 170static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
171 int dir);
172
24969fac 173static struct xfrm_pol_inexact_bin *
b5fe22e2
FW		 174xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family, u8 dir,
175 u32 if_id);
24969fac
FW		 176
177static struct xfrm_pol_inexact_bin *
178xfrm_policy_inexact_lookup_rcu(struct net *net,
b5fe22e2 179 u8 type, u16 family, u8 dir, u32 if_id);
24969fac
FW		 180static struct xfrm_policy *
181xfrm_policy_insert_list(struct hlist_head *chain, struct xfrm_policy *policy,
182 bool excl);
183static void xfrm_policy_insert_inexact_list(struct hlist_head *chain,
184 struct xfrm_policy *policy);
185
6be3b0db
FW		 186static bool
187xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand,
188 struct xfrm_pol_inexact_bin *b,
189 const xfrm_address_t *saddr,
190 const xfrm_address_t *daddr);
191
e37cc8ad
FW		 192static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
193{
850a6212 194 return refcount_inc_not_zero(&policy->refcnt);
e37cc8ad
FW		 195}
196
bc9b35ad 197static inline bool
200ce96e 198__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 199{
7e1dc7b6
DM		 200 const struct flowi4 *fl4 = &fl->u.ip4;
201
26bff940
AD		 202 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
203 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 204 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
205 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
206 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
207 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 208}
209
bc9b35ad 210static inline bool
200ce96e 211__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 212{
7e1dc7b6
DM		 213 const struct flowi6 *fl6 = &fl->u.ip6;
214
215 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
216 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
217 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
218 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
219 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
220 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 221}
222
bc9b35ad
DM		 223bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
224 unsigned short family)
77681021
AM		 225{
226 switch (family) {
227 case AF_INET:
228 return __xfrm4_selector_match(sel, fl);
229 case AF_INET6:
230 return __xfrm6_selector_match(sel, fl);
231 }
bc9b35ad 232 return false;
77681021
AM		 233}
234
a2817d8b 235static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
ef8531b6 236{
a2817d8b 237 const struct xfrm_policy_afinfo *afinfo;
ef8531b6 238
a2817d8b 239 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
ef8531b6
ED		 240 return NULL;
241 rcu_read_lock();
242 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
243 if (unlikely(!afinfo))
244 rcu_read_unlock();
245 return afinfo;
246}
247
f203b76d
SK		 248/* Called with rcu_read_lock(). */
249static const struct xfrm_if_cb *xfrm_if_get_cb(void)
250{
251 return rcu_dereference(xfrm_if_cb);
252}
253
d77e38e6
SK		 254struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
255 const xfrm_address_t *saddr,
256 const xfrm_address_t *daddr,
077fbac4 257 int family, u32 mark)
9bb182a7 258{
37b10383 259 const struct xfrm_policy_afinfo *afinfo;
9bb182a7
YH		 260 struct dst_entry *dst;
261
262 afinfo = xfrm_policy_get_afinfo(family);
263 if (unlikely(afinfo == NULL))
264 return ERR_PTR(-EAFNOSUPPORT);
265
077fbac4 266 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark);
9bb182a7 267
bdba9fe0 268 rcu_read_unlock();
9bb182a7
YH		 269
270 return dst;
271}
d77e38e6 272EXPORT_SYMBOL(__xfrm_dst_lookup);
9bb182a7 273
42a7b32b
DA		 274static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
275 int tos, int oif,
9bb182a7
YH		 276 xfrm_address_t *prev_saddr,
277 xfrm_address_t *prev_daddr,
077fbac4 278 int family, u32 mark)
1da177e4 279{
c5b3cf46 280 struct net *net = xs_net(x);
66cdb3ca
HX		 281 xfrm_address_t *saddr = &x->props.saddr;
282 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 283 struct dst_entry *dst;
284
9bb182a7 285 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 286 saddr = x->coaddr;
9bb182a7
YH		 287 daddr = prev_daddr;
288 }
289 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
290 saddr = prev_saddr;
66cdb3ca 291 daddr = x->coaddr;
9bb182a7 292 }
1da177e4 293
077fbac4 294 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark);
9bb182a7
YH		 295
296 if (!IS_ERR(dst)) {
297 if (prev_saddr != saddr)
298 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
299 if (prev_daddr != daddr)
300 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
301 }
1da177e4 302
66cdb3ca 303 return dst;
1da177e4 304}
1da177e4 305
1da177e4
LT		 306static inline unsigned long make_jiffies(long secs)
307{
308 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
309 return MAX_SCHEDULE_TIMEOUT-1;
310 else
a716c119 311 return secs*HZ;
1da177e4
LT		 312}
313
c3aed709 314static void xfrm_policy_timer(struct timer_list *t)
1da177e4 315{
c3aed709 316 struct xfrm_policy *xp = from_timer(xp, t, timer);
386c5680
AB		 317 time64_t now = ktime_get_real_seconds();
318 time64_t next = TIME64_MAX;
1da177e4
LT		 319 int warn = 0;
320 int dir;
321
322 read_lock(&xp->lock);
323
ea2dea9d 324 if (unlikely(xp->walk.dead))
1da177e4
LT		 325 goto out;
326
77d8d7a6 327 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 328
329 if (xp->lft.hard_add_expires_seconds) {
386c5680 330 time64_t tmo = xp->lft.hard_add_expires_seconds +
1da177e4
LT		 331 xp->curlft.add_time - now;
332 if (tmo <= 0)
333 goto expired;
334 if (tmo < next)
335 next = tmo;
336 }
337 if (xp->lft.hard_use_expires_seconds) {
386c5680 338 time64_t tmo = xp->lft.hard_use_expires_seconds +
0a9e5794 339 (READ_ONCE(xp->curlft.use_time) ? : xp->curlft.add_time) - now;
1da177e4
LT		 340 if (tmo <= 0)
341 goto expired;
342 if (tmo < next)
343 next = tmo;
344 }
345 if (xp->lft.soft_add_expires_seconds) {
386c5680 346 time64_t tmo = xp->lft.soft_add_expires_seconds +
1da177e4
LT		 347 xp->curlft.add_time - now;
348 if (tmo <= 0) {
349 warn = 1;
350 tmo = XFRM_KM_TIMEOUT;
351 }
352 if (tmo < next)
353 next = tmo;
354 }
355 if (xp->lft.soft_use_expires_seconds) {
386c5680 356 time64_t tmo = xp->lft.soft_use_expires_seconds +
0a9e5794 357 (READ_ONCE(xp->curlft.use_time) ? : xp->curlft.add_time) - now;
1da177e4
LT		 358 if (tmo <= 0) {
359 warn = 1;
360 tmo = XFRM_KM_TIMEOUT;
361 }
362 if (tmo < next)
363 next = tmo;
364 }
365
366 if (warn)
6c5c8ca7 367 km_policy_expired(xp, dir, 0, 0);
386c5680 368 if (next != TIME64_MAX &&
1da177e4
LT		 369 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
370 xfrm_pol_hold(xp);
371
372out:
373 read_unlock(&xp->lock);
374 xfrm_pol_put(xp);
375 return;
376
377expired:
378 read_unlock(&xp->lock);
4666faab 379 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 380 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 381 xfrm_pol_put(xp);
382}
383
1da177e4
LT		 384/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
385 * SPD calls.
386 */
387
0331b1f3 388struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 389{
390 struct xfrm_policy *policy;
391
0da974f4 392 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 393
394 if (policy) {
0331b1f3 395 write_pnet(&policy->xp_net, net);
12a169e7 396 INIT_LIST_HEAD(&policy->walk.all);
24969fac 397 INIT_HLIST_NODE(&policy->bydst_inexact_list);
2518c7c2
DM		 398 INIT_HLIST_NODE(&policy->bydst);
399 INIT_HLIST_NODE(&policy->byidx);
1da177e4 400 rwlock_init(&policy->lock);
850a6212 401 refcount_set(&policy->refcnt, 1);
a0073fe1 402 skb_queue_head_init(&policy->polq.hold_queue);
c3aed709
KC		 403 timer_setup(&policy->timer, xfrm_policy_timer, 0);
404 timer_setup(&policy->polq.hold_timer,
405 xfrm_policy_queue_process, 0);
1da177e4
LT		 406 }
407 return policy;
408}
409EXPORT_SYMBOL(xfrm_policy_alloc);
410
56f04730
ED		 411static void xfrm_policy_destroy_rcu(struct rcu_head *head)
412{
413 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
414
415 security_xfrm_policy_free(policy->security);
416 kfree(policy);
417}
418
1da177e4
LT		 419/* Destroy xfrm_policy: descendant resources must be released to this moment. */
420
64c31b3f 421void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 422{
12a169e7 423 BUG_ON(!policy->walk.dead);
1da177e4 424
0659eea9 425 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 426 BUG();
427
919e43fa 428 xfrm_dev_policy_free(policy);
56f04730 429 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
1da177e4 430}
64c31b3f 431EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 432
1365e547 433/* Rule must be locked. Release descendant resources, announce
1da177e4
LT		 434 * entry dead. The rule must be unlinked from lists to the moment.
435 */
436
437static void xfrm_policy_kill(struct xfrm_policy *policy)
438{
4c59406e 439 write_lock_bh(&policy->lock);
12a169e7 440 policy->walk.dead = 1;
4c59406e 441 write_unlock_bh(&policy->lock);
1da177e4 442
285ead17 443 atomic_inc(&policy->genid);
1da177e4 444
e7d8f6cb
SK		 445 if (del_timer(&policy->polq.hold_timer))
446 xfrm_pol_put(policy);
1ee5e667 447 skb_queue_purge(&policy->polq.hold_queue);
a0073fe1 448
285ead17
TT		 449 if (del_timer(&policy->timer))
450 xfrm_pol_put(policy);
451
452 xfrm_pol_put(policy);
1da177e4
LT		 453}
454
2518c7c2
DM		 455static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
456
e92303f8 457static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 458{
e92303f8 459 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 460}
461
b58555f1
CG		 462/* calculate policy hash thresholds */
463static void __get_hash_thresh(struct net *net,
464 unsigned short family, int dir,
465 u8 *dbits, u8 *sbits)
466{
467 switch (family) {
468 case AF_INET:
469 *dbits = net->xfrm.policy_bydst[dir].dbits4;
470 *sbits = net->xfrm.policy_bydst[dir].sbits4;
471 break;
472
473 case AF_INET6:
474 *dbits = net->xfrm.policy_bydst[dir].dbits6;
475 *sbits = net->xfrm.policy_bydst[dir].sbits6;
476 break;
477
478 default:
479 *dbits = 0;
480 *sbits = 0;
481 }
482}
483
5f803b58
DM		 484static struct hlist_head *policy_hash_bysel(struct net *net,
485 const struct xfrm_selector *sel,
486 unsigned short family, int dir)
2518c7c2 487{
1121994c 488 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 489 unsigned int hash;
490 u8 dbits;
491 u8 sbits;
492
493 __get_hash_thresh(net, family, dir, &dbits, &sbits);
494 hash = __sel_hash(sel, family, hmask, dbits, sbits);
2518c7c2 495
e1e551bc 496 if (hash == hmask + 1)
cc1bb845 497 return NULL;
e1e551bc
FW		 498
499 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
500 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 501}
502
5f803b58
DM		 503static struct hlist_head *policy_hash_direct(struct net *net,
504 const xfrm_address_t *daddr,
505 const xfrm_address_t *saddr,
506 unsigned short family, int dir)
2518c7c2 507{
1121994c 508 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
b58555f1
CG		 509 unsigned int hash;
510 u8 dbits;
511 u8 sbits;
512
513 __get_hash_thresh(net, family, dir, &dbits, &sbits);
514 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
2518c7c2 515
e1e551bc
FW		 516 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
517 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
2518c7c2
DM		 518}
519
b58555f1
CG		 520static void xfrm_dst_hash_transfer(struct net *net,
521 struct hlist_head *list,
2518c7c2 522 struct hlist_head *ndsttable,
b58555f1
CG		 523 unsigned int nhashmask,
524 int dir)
2518c7c2 525{
b67bfe0d 526 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 527 struct xfrm_policy *pol;
b791160b 528 unsigned int h0 = 0;
b58555f1
CG		 529 u8 dbits;
530 u8 sbits;
2518c7c2 531
b791160b 532redo:
b67bfe0d 533 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 534 unsigned int h;
535
b58555f1 536 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
2518c7c2 537 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
b58555f1 538 pol->family, nhashmask, dbits, sbits);
3c611d40 539 if (!entry0 || pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
a5eefc1d
FW		 540 hlist_del_rcu(&pol->bydst);
541 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
b791160b
YH		 542 h0 = h;
543 } else {
544 if (h != h0)
545 continue;
a5eefc1d
FW		 546 hlist_del_rcu(&pol->bydst);
547 hlist_add_behind_rcu(&pol->bydst, entry0);
b791160b 548 }
b67bfe0d 549 entry0 = &pol->bydst;
b791160b
YH		 550 }
551 if (!hlist_empty(list)) {
552 entry0 = NULL;
553 goto redo;
2518c7c2
DM		 554 }
555}
556
557static void xfrm_idx_hash_transfer(struct hlist_head *list,
558 struct hlist_head *nidxtable,
559 unsigned int nhashmask)
560{
b67bfe0d 561 struct hlist_node *tmp;
2518c7c2
DM		 562 struct xfrm_policy *pol;
563
b67bfe0d 564 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 565 unsigned int h;
566
567 h = __idx_hash(pol->index, nhashmask);
568 hlist_add_head(&pol->byidx, nidxtable+h);
569 }
570}
571
572static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
573{
574 return ((old_hmask + 1) << 1) - 1;
575}
576
66caf628 577static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 578{
66caf628 579 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 580 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
581 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
44e36b42 582 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
e1e551bc 583 struct hlist_head *odst;
2518c7c2
DM		 584 int i;
585
586 if (!ndst)
587 return;
588
9d0380df 589 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2580d3f4 590 write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation);
30846090 591
e1e551bc
FW		 592 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
593 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
594
2518c7c2 595 for (i = hmask; i >= 0; i--)
b58555f1 596 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
2518c7c2 597
e1e551bc 598 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
66caf628 599 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 600
2580d3f4 601 write_seqcount_end(&net->xfrm.xfrm_policy_hash_generation);
9d0380df 602 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 603
e1e551bc
FW		 604 synchronize_rcu();
605
44e36b42 606 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 607}
608
cc2bbbfd 609static void xfrm_byidx_resize(struct net *net)
2518c7c2 610{
66caf628 611 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 612 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
613 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 614 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 615 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 616 int i;
617
618 if (!nidx)
619 return;
620
9d0380df 621 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 622
623 for (i = hmask; i >= 0; i--)
624 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
625
66caf628
AD		 626 net->xfrm.policy_byidx = nidx;
627 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 628
9d0380df 629 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 630
44e36b42 631 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 632}
633
66caf628 634static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 635{
66caf628
AD		 636 unsigned int cnt = net->xfrm.policy_count[dir];
637 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 638
639 if (total)
640 *total += cnt;
641
642 if ((hmask + 1) < xfrm_policy_hashmax &&
643 cnt > hmask)
644 return 1;
645
646 return 0;
647}
648
66caf628 649static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 650{
66caf628 651 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 652
653 if ((hmask + 1) < xfrm_policy_hashmax &&
654 total > hmask)
655 return 1;
656
657 return 0;
658}
659
e071041b 660void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 661{
e071041b
AD		 662 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
663 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
664 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
665 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
666 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
667 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
668 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 669 si->spdhmcnt = xfrm_policy_hashmax;
ecfd6b18
JHS		 670}
671EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 672
ecfd6b18 673static DEFINE_MUTEX(hash_resize_mutex);
66caf628 674static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 675{
66caf628 676 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 677 int dir, total;
678
679 mutex_lock(&hash_resize_mutex);
680
681 total = 0;
53c2e285 682 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
66caf628
AD		 683 if (xfrm_bydst_should_resize(net, dir, &total))
684 xfrm_bydst_resize(net, dir);
2518c7c2 685 }
66caf628 686 if (xfrm_byidx_should_resize(net, total))
cc2bbbfd 687 xfrm_byidx_resize(net);
2518c7c2
DM		 688
689 mutex_unlock(&hash_resize_mutex);
690}
691
24969fac 692/* Make sure *pol can be inserted into fastbin.
aa8ef1b9 693 * Useful to check that later insert requests will be successful
24969fac
FW		 694 * (provided xfrm_policy_lock is held throughout).
695 */
696static struct xfrm_pol_inexact_bin *
697xfrm_policy_inexact_alloc_bin(const struct xfrm_policy *pol, u8 dir)
698{
699 struct xfrm_pol_inexact_bin *bin, *prev;
700 struct xfrm_pol_inexact_key k = {
701 .family = pol->family,
702 .type = pol->type,
703 .dir = dir,
b5fe22e2 704 .if_id = pol->if_id,
24969fac
FW		 705 };
706 struct net *net = xp_net(pol);
707
708 lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
709
710 write_pnet(&k.net, net);
711 bin = rhashtable_lookup_fast(&xfrm_policy_inexact_table, &k,
712 xfrm_pol_inexact_params);
713 if (bin)
714 return bin;
715
716 bin = kzalloc(sizeof(*bin), GFP_ATOMIC);
717 if (!bin)
718 return NULL;
719
720 bin->k = k;
721 INIT_HLIST_HEAD(&bin->hhead);
9cf545eb 722 bin->root_d = RB_ROOT;
64a09a7b 723 bin->root_s = RB_ROOT;
77cc278f 724 seqcount_spinlock_init(&bin->count, &net->xfrm.xfrm_policy_lock);
24969fac
FW		 725
726 prev = rhashtable_lookup_get_insert_key(&xfrm_policy_inexact_table,
727 &bin->k, &bin->head,
728 xfrm_pol_inexact_params);
729 if (!prev) {
730 list_add(&bin->inexact_bins, &net->xfrm.inexact_bins);
731 return bin;
732 }
733
734 kfree(bin);
735
736 return IS_ERR(prev) ? NULL : prev;
737}
738
6be3b0db
FW		 739static bool xfrm_pol_inexact_addr_use_any_list(const xfrm_address_t *addr,
740 int family, u8 prefixlen)
24969fac 741{
6be3b0db
FW		 742 if (xfrm_addr_any(addr, family))
743 return true;
744
745 if (family == AF_INET6 && prefixlen < INEXACT_PREFIXLEN_IPV6)
746 return true;
747
748 if (family == AF_INET && prefixlen < INEXACT_PREFIXLEN_IPV4)
749 return true;
750
751 return false;
752}
753
754static bool
755xfrm_policy_inexact_insert_use_any_list(const struct xfrm_policy *policy)
756{
757 const xfrm_address_t *addr;
758 bool saddr_any, daddr_any;
759 u8 prefixlen;
760
761 addr = &policy->selector.saddr;
762 prefixlen = policy->selector.prefixlen_s;
24969fac 763
6be3b0db
FW		 764 saddr_any = xfrm_pol_inexact_addr_use_any_list(addr,
765 policy->family,
766 prefixlen);
767 addr = &policy->selector.daddr;
768 prefixlen = policy->selector.prefixlen_d;
769 daddr_any = xfrm_pol_inexact_addr_use_any_list(addr,
770 policy->family,
771 prefixlen);
772 return saddr_any && daddr_any;
773}
774
9cf545eb
FW		 775static void xfrm_pol_inexact_node_init(struct xfrm_pol_inexact_node *node,
776 const xfrm_address_t *addr, u8 prefixlen)
777{
778 node->addr = *addr;
779 node->prefixlen = prefixlen;
780}
781
782static struct xfrm_pol_inexact_node *
783xfrm_pol_inexact_node_alloc(const xfrm_address_t *addr, u8 prefixlen)
784{
785 struct xfrm_pol_inexact_node *node;
786
787 node = kzalloc(sizeof(*node), GFP_ATOMIC);
788 if (node)
789 xfrm_pol_inexact_node_init(node, addr, prefixlen);
790
791 return node;
792}
793
794static int xfrm_policy_addr_delta(const xfrm_address_t *a,
795 const xfrm_address_t *b,
796 u8 prefixlen, u16 family)
797{
da64ae2d 798 u32 ma, mb, mask;
9cf545eb
FW		 799 unsigned int pdw, pbi;
800 int delta = 0;
801
802 switch (family) {
803 case AF_INET:
da64ae2d
VH		 804 if (prefixlen == 0)
805 return 0;
806 mask = ~0U << (32 - prefixlen);
807 ma = ntohl(a->a4) & mask;
808 mb = ntohl(b->a4) & mask;
809 if (ma < mb)
810 delta = -1;
811 else if (ma > mb)
812 delta = 1;
813 break;
9cf545eb
FW		 814 case AF_INET6:
815 pdw = prefixlen >> 5;
816 pbi = prefixlen & 0x1f;
817
818 if (pdw) {
819 delta = memcmp(a->a6, b->a6, pdw << 2);
820 if (delta)
821 return delta;
822 }
823 if (pbi) {
da64ae2d
VH		 824 mask = ~0U << (32 - pbi);
825 ma = ntohl(a->a6[pdw]) & mask;
826 mb = ntohl(b->a6[pdw]) & mask;
827 if (ma < mb)
828 delta = -1;
829 else if (ma > mb)
830 delta = 1;
9cf545eb
FW		 831 }
832 break;
833 default:
834 break;
835 }
836
837 return delta;
838}
839
840static void xfrm_policy_inexact_list_reinsert(struct net *net,
841 struct xfrm_pol_inexact_node *n,
842 u16 family)
843{
e901cbc2 844 unsigned int matched_s, matched_d;
9cf545eb
FW		 845 struct xfrm_policy *policy, *p;
846
e901cbc2
FW		 847 matched_s = 0;
848 matched_d = 0;
849
9cf545eb 850 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
1d38900c 851 struct hlist_node *newpos = NULL;
e901cbc2
FW		 852 bool matches_s, matches_d;
853
6d41d4fe 854 if (policy->walk.dead || !policy->bydst_reinsert)
9cf545eb
FW		 855 continue;
856
857 WARN_ON_ONCE(policy->family != family);
858
859 policy->bydst_reinsert = false;
860 hlist_for_each_entry(p, &n->hhead, bydst) {
1d38900c
FW		 861 if (policy->priority > p->priority)
862 newpos = &p->bydst;
863 else if (policy->priority == p->priority &&
864 policy->pos > p->pos)
9cf545eb
FW		 865 newpos = &p->bydst;
866 else
867 break;
868 }
869
3c611d40 870 if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
355b00d1 871 hlist_add_behind_rcu(&policy->bydst, newpos);
9cf545eb 872 else
355b00d1 873 hlist_add_head_rcu(&policy->bydst, &n->hhead);
e901cbc2
FW		 874
875 /* paranoia checks follow.
876 * Check that the reinserted policy matches at least
877 * saddr or daddr for current node prefix.
878 *
879 * Matching both is fine, matching saddr in one policy
880 * (but not daddr) and then matching only daddr in another
881 * is a bug.
882 */
883 matches_s = xfrm_policy_addr_delta(&policy->selector.saddr,
884 &n->addr,
885 n->prefixlen,
886 family) == 0;
887 matches_d = xfrm_policy_addr_delta(&policy->selector.daddr,
888 &n->addr,
889 n->prefixlen,
890 family) == 0;
891 if (matches_s && matches_d)
892 continue;
893
894 WARN_ON_ONCE(!matches_s && !matches_d);
895 if (matches_s)
896 matched_s++;
897 if (matches_d)
898 matched_d++;
899 WARN_ON_ONCE(matched_s && matched_d);
9cf545eb
FW		 900 }
901}
902
6ac098b2
FW		 903static void xfrm_policy_inexact_node_reinsert(struct net *net,
904 struct xfrm_pol_inexact_node *n,
905 struct rb_root *new,
906 u16 family)
907{
6ac098b2 908 struct xfrm_pol_inexact_node *node;
12750aba 909 struct rb_node **p, *parent;
6ac098b2
FW		 910
911 /* we should not have another subtree here */
912 WARN_ON_ONCE(!RB_EMPTY_ROOT(&n->root));
12750aba
FW		 913restart:
914 parent = NULL;
6ac098b2
FW		 915 p = &new->rb_node;
916 while (*p) {
917 u8 prefixlen;
918 int delta;
919
920 parent = *p;
921 node = rb_entry(*p, struct xfrm_pol_inexact_node, node);
922
923 prefixlen = min(node->prefixlen, n->prefixlen);
924
925 delta = xfrm_policy_addr_delta(&n->addr, &node->addr,
926 prefixlen, family);
927 if (delta < 0) {
928 p = &parent->rb_left;
929 } else if (delta > 0) {
930 p = &parent->rb_right;
931 } else {
769a807d 932 bool same_prefixlen = node->prefixlen == n->prefixlen;
6ac098b2
FW		 933 struct xfrm_policy *tmp;
934
12750aba 935 hlist_for_each_entry(tmp, &n->hhead, bydst) {
6ac098b2 936 tmp->bydst_reinsert = true;
12750aba
FW		 937 hlist_del_rcu(&tmp->bydst);
938 }
6ac098b2 939
769a807d
FW		 940 node->prefixlen = prefixlen;
941
6ac098b2
FW		 942 xfrm_policy_inexact_list_reinsert(net, node, family);
943
769a807d 944 if (same_prefixlen) {
6ac098b2
FW		 945 kfree_rcu(n, rcu);
946 return;
947 }
948
949 rb_erase(*p, new);
950 kfree_rcu(n, rcu);
951 n = node;
12750aba 952 goto restart;
6ac098b2
FW		 953 }
954 }
955
956 rb_link_node_rcu(&n->node, parent, p);
957 rb_insert_color(&n->node, new);
958}
959
9cf545eb
FW		 960/* merge nodes v and n */
961static void xfrm_policy_inexact_node_merge(struct net *net,
962 struct xfrm_pol_inexact_node *v,
963 struct xfrm_pol_inexact_node *n,
964 u16 family)
965{
6ac098b2 966 struct xfrm_pol_inexact_node *node;
9cf545eb 967 struct xfrm_policy *tmp;
6ac098b2
FW		 968 struct rb_node *rnode;
969
970 /* To-be-merged node v has a subtree.
971 *
972 * Dismantle it and insert its nodes to n->root.
973 */
974 while ((rnode = rb_first(&v->root)) != NULL) {
975 node = rb_entry(rnode, struct xfrm_pol_inexact_node, node);
976 rb_erase(&node->node, &v->root);
977 xfrm_policy_inexact_node_reinsert(net, node, &n->root,
978 family);
979 }
9cf545eb 980
1d38900c 981 hlist_for_each_entry(tmp, &v->hhead, bydst) {
9cf545eb 982 tmp->bydst_reinsert = true;
1d38900c
FW		 983 hlist_del_rcu(&tmp->bydst);
984 }
9cf545eb 985
9cf545eb
FW		 986 xfrm_policy_inexact_list_reinsert(net, n, family);
987}
988
989static struct xfrm_pol_inexact_node *
990xfrm_policy_inexact_insert_node(struct net *net,
991 struct rb_root *root,
992 xfrm_address_t *addr,
993 u16 family, u8 prefixlen, u8 dir)
994{
995 struct xfrm_pol_inexact_node *cached = NULL;
996 struct rb_node **p, *parent = NULL;
997 struct xfrm_pol_inexact_node *node;
998
999 p = &root->rb_node;
1000 while (*p) {
1001 int delta;
1002
1003 parent = *p;
1004 node = rb_entry(*p, struct xfrm_pol_inexact_node, node);
1005
1006 delta = xfrm_policy_addr_delta(addr, &node->addr,
1007 node->prefixlen,
1008 family);
1009 if (delta == 0 && prefixlen >= node->prefixlen) {
1010 WARN_ON_ONCE(cached); /* ipsec policies got lost */
1011 return node;
1012 }
1013
1014 if (delta < 0)
1015 p = &parent->rb_left;
1016 else
1017 p = &parent->rb_right;
1018
1019 if (prefixlen < node->prefixlen) {
1020 delta = xfrm_policy_addr_delta(addr, &node->addr,
1021 prefixlen,
1022 family);
1023 if (delta)
1024 continue;
1025
1026 /* This node is a subnet of the new prefix. It needs
1027 * to be removed and re-inserted with the smaller
1028 * prefix and all nodes that are now also covered
1029 * by the reduced prefixlen.
1030 */
1031 rb_erase(&node->node, root);
1032
1033 if (!cached) {
1034 xfrm_pol_inexact_node_init(node, addr,
1035 prefixlen);
1036 cached = node;
1037 } else {
1038 /* This node also falls within the new
1039 * prefixlen. Merge the to-be-reinserted
1040 * node and this one.
1041 */
1042 xfrm_policy_inexact_node_merge(net, node,
1043 cached, family);
1044 kfree_rcu(node, rcu);
1045 }
1046
1047 /* restart */
1048 p = &root->rb_node;
1049 parent = NULL;
1050 }
1051 }
1052
1053 node = cached;
1054 if (!node) {
1055 node = xfrm_pol_inexact_node_alloc(addr, prefixlen);
1056 if (!node)
1057 return NULL;
1058 }
1059
1060 rb_link_node_rcu(&node->node, parent, p);
1061 rb_insert_color(&node->node, root);
1062
1063 return node;
1064}
1065
1066static void xfrm_policy_inexact_gc_tree(struct rb_root *r, bool rm)
1067{
1068 struct xfrm_pol_inexact_node *node;
1069 struct rb_node *rn = rb_first(r);
1070
1071 while (rn) {
1072 node = rb_entry(rn, struct xfrm_pol_inexact_node, node);
1073
6ac098b2 1074 xfrm_policy_inexact_gc_tree(&node->root, rm);
9cf545eb
FW		 1075 rn = rb_next(rn);
1076
6ac098b2 1077 if (!hlist_empty(&node->hhead) || !RB_EMPTY_ROOT(&node->root)) {
9cf545eb
FW		 1078 WARN_ON_ONCE(rm);
1079 continue;
1080 }
1081
1082 rb_erase(&node->node, r);
1083 kfree_rcu(node, rcu);
1084 }
1085}
1086
6be3b0db
FW		 1087static void __xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b, bool net_exit)
1088{
9cf545eb
FW		 1089 write_seqcount_begin(&b->count);
1090 xfrm_policy_inexact_gc_tree(&b->root_d, net_exit);
64a09a7b 1091 xfrm_policy_inexact_gc_tree(&b->root_s, net_exit);
9cf545eb
FW		 1092 write_seqcount_end(&b->count);
1093
64a09a7b 1094 if (!RB_EMPTY_ROOT(&b->root_d) || !RB_EMPTY_ROOT(&b->root_s) ||
9cf545eb 1095 !hlist_empty(&b->hhead)) {
6be3b0db 1096 WARN_ON_ONCE(net_exit);
24969fac 1097 return;
6be3b0db 1098 }
24969fac
FW		 1099
1100 if (rhashtable_remove_fast(&xfrm_policy_inexact_table, &b->head,
1101 xfrm_pol_inexact_params) == 0) {
1102 list_del(&b->inexact_bins);
1103 kfree_rcu(b, rcu);
1104 }
1105}
1106
6be3b0db
FW		 1107static void xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b)
1108{
1109 struct net *net = read_pnet(&b->k.net);
1110
1111 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1112 __xfrm_policy_inexact_prune_bin(b, false);
1113 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1114}
1115
24969fac
FW		 1116static void __xfrm_policy_inexact_flush(struct net *net)
1117{
6be3b0db 1118 struct xfrm_pol_inexact_bin *bin, *t;
24969fac
FW		 1119
1120 lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
1121
6be3b0db
FW		 1122 list_for_each_entry_safe(bin, t, &net->xfrm.inexact_bins, inexact_bins)
1123 __xfrm_policy_inexact_prune_bin(bin, false);
24969fac
FW		 1124}
1125
9cf545eb
FW		 1126static struct hlist_head *
1127xfrm_policy_inexact_alloc_chain(struct xfrm_pol_inexact_bin *bin,
1128 struct xfrm_policy *policy, u8 dir)
1129{
1130 struct xfrm_pol_inexact_node *n;
1131 struct net *net;
1132
1133 net = xp_net(policy);
1134 lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
1135
1136 if (xfrm_policy_inexact_insert_use_any_list(policy))
1137 return &bin->hhead;
1138
64a09a7b
FW		 1139 if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.daddr,
1140 policy->family,
1141 policy->selector.prefixlen_d)) {
1142 write_seqcount_begin(&bin->count);
1143 n = xfrm_policy_inexact_insert_node(net,
1144 &bin->root_s,
1145 &policy->selector.saddr,
1146 policy->family,
1147 policy->selector.prefixlen_s,
1148 dir);
1149 write_seqcount_end(&bin->count);
1150 if (!n)
1151 return NULL;
1152
1153 return &n->hhead;
1154 }
1155
9cf545eb
FW		 1156 /* daddr is fixed */
1157 write_seqcount_begin(&bin->count);
1158 n = xfrm_policy_inexact_insert_node(net,
1159 &bin->root_d,
1160 &policy->selector.daddr,
1161 policy->family,
1162 policy->selector.prefixlen_d, dir);
1163 write_seqcount_end(&bin->count);
1164 if (!n)
1165 return NULL;
6ac098b2
FW		 1166
1167 /* saddr is wildcard */
1168 if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.saddr,
1169 policy->family,
1170 policy->selector.prefixlen_s))
1171 return &n->hhead;
1172
1173 write_seqcount_begin(&bin->count);
1174 n = xfrm_policy_inexact_insert_node(net,
1175 &n->root,
1176 &policy->selector.saddr,
1177 policy->family,
1178 policy->selector.prefixlen_s, dir);
1179 write_seqcount_end(&bin->count);
1180 if (!n)
1181 return NULL;
1182
9cf545eb
FW		 1183 return &n->hhead;
1184}
1185
24969fac
FW		 1186static struct xfrm_policy *
1187xfrm_policy_inexact_insert(struct xfrm_policy *policy, u8 dir, int excl)
1188{
1189 struct xfrm_pol_inexact_bin *bin;
1190 struct xfrm_policy *delpol;
1191 struct hlist_head *chain;
1192 struct net *net;
1193
1194 bin = xfrm_policy_inexact_alloc_bin(policy, dir);
1195 if (!bin)
1196 return ERR_PTR(-ENOMEM);
1197
6be3b0db
FW		 1198 net = xp_net(policy);
1199 lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
1200
9cf545eb
FW		 1201 chain = xfrm_policy_inexact_alloc_chain(bin, policy, dir);
1202 if (!chain) {
1203 __xfrm_policy_inexact_prune_bin(bin, false);
1204 return ERR_PTR(-ENOMEM);
6be3b0db
FW		 1205 }
1206
6be3b0db
FW		 1207 delpol = xfrm_policy_insert_list(chain, policy, excl);
1208 if (delpol && excl) {
1209 __xfrm_policy_inexact_prune_bin(bin, false);
24969fac 1210 return ERR_PTR(-EEXIST);
6be3b0db 1211 }
24969fac 1212
24969fac
FW		 1213 chain = &net->xfrm.policy_inexact[dir];
1214 xfrm_policy_insert_inexact_list(chain, policy);
1215
6be3b0db
FW		 1216 if (delpol)
1217 __xfrm_policy_inexact_prune_bin(bin, false);
1218
24969fac
FW		 1219 return delpol;
1220}
1221
880a6fab
CG		 1222static void xfrm_hash_rebuild(struct work_struct *work)
1223{
1224 struct net *net = container_of(work, struct net,
1225 xfrm.policy_hthresh.work);
1226 unsigned int hmask;
1227 struct xfrm_policy *pol;
1228 struct xfrm_policy *policy;
1229 struct hlist_head *chain;
1230 struct hlist_head *odst;
1231 struct hlist_node *newpos;
1232 int i;
1233 int dir;
1234 unsigned seq;
1235 u8 lbits4, rbits4, lbits6, rbits6;
1236
1237 mutex_lock(&hash_resize_mutex);
1238
1239 /* read selector prefixlen thresholds */
1240 do {
1241 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1242
1243 lbits4 = net->xfrm.policy_hthresh.lbits4;
1244 rbits4 = net->xfrm.policy_hthresh.rbits4;
1245 lbits6 = net->xfrm.policy_hthresh.lbits6;
1246 rbits6 = net->xfrm.policy_hthresh.rbits6;
1247 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
1248
9d0380df 1249 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
2580d3f4 1250 write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation);
880a6fab 1251
24969fac
FW		 1252 /* make sure that we can insert the indirect policies again before
1253 * we start with destructive action.
1254 */
1255 list_for_each_entry(policy, &net->xfrm.policy_all, walk.all) {
6be3b0db 1256 struct xfrm_pol_inexact_bin *bin;
24969fac
FW		 1257 u8 dbits, sbits;
1258
6d41d4fe
DC		 1259 if (policy->walk.dead)
1260 continue;
1261
24969fac 1262 dir = xfrm_policy_id2dir(policy->index);
6d41d4fe 1263 if (dir >= XFRM_POLICY_MAX)
24969fac
FW		 1264 continue;
1265
1266 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
1267 if (policy->family == AF_INET) {
1268 dbits = rbits4;
1269 sbits = lbits4;
1270 } else {
1271 dbits = rbits6;
1272 sbits = lbits6;
1273 }
1274 } else {
1275 if (policy->family == AF_INET) {
1276 dbits = lbits4;
1277 sbits = rbits4;
1278 } else {
1279 dbits = lbits6;
1280 sbits = rbits6;
1281 }
1282 }
1283
1284 if (policy->selector.prefixlen_d < dbits ||
1285 policy->selector.prefixlen_s < sbits)
1286 continue;
1287
6be3b0db
FW		 1288 bin = xfrm_policy_inexact_alloc_bin(policy, dir);
1289 if (!bin)
24969fac 1290 goto out_unlock;
9cf545eb
FW		 1291
1292 if (!xfrm_policy_inexact_alloc_chain(bin, policy, dir))
1293 goto out_unlock;
24969fac
FW		 1294 }
1295
880a6fab 1296 /* reset the bydst and inexact table in all directions */
53c2e285 1297 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
1548bc4e
FW		 1298 struct hlist_node *n;
1299
1300 hlist_for_each_entry_safe(policy, n,
1301 &net->xfrm.policy_inexact[dir],
fd709721
FW		 1302 bydst_inexact_list) {
1303 hlist_del_rcu(&policy->bydst);
1548bc4e 1304 hlist_del_init(&policy->bydst_inexact_list);
fd709721 1305 }
1548bc4e 1306
880a6fab
CG		 1307 hmask = net->xfrm.policy_bydst[dir].hmask;
1308 odst = net->xfrm.policy_bydst[dir].table;
fd709721
FW		 1309 for (i = hmask; i >= 0; i--) {
1310 hlist_for_each_entry_safe(policy, n, odst + i, bydst)
1311 hlist_del_rcu(&policy->bydst);
1312 }
880a6fab
CG		 1313 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
1314 /* dir out => dst = remote, src = local */
1315 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
1316 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
1317 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
1318 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
1319 } else {
1320 /* dir in/fwd => dst = local, src = remote */
1321 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
1322 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
1323 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
1324 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
1325 }
1326 }
1327
1328 /* re-insert all policies by order of creation */
1329 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
88584c30
FW		 1330 if (policy->walk.dead)
1331 continue;
1332 dir = xfrm_policy_id2dir(policy->index);
1333 if (dir >= XFRM_POLICY_MAX) {
6916fb3b
TB		 1334 /* skip socket policies */
1335 continue;
1336 }
880a6fab
CG		 1337 newpos = NULL;
1338 chain = policy_hash_bysel(net, &policy->selector,
88584c30 1339 policy->family, dir);
1548bc4e 1340
24969fac
FW		 1341 if (!chain) {
1342 void *p = xfrm_policy_inexact_insert(policy, dir, 0);
1343
1344 WARN_ONCE(IS_ERR(p), "reinsert: %ld\n", PTR_ERR(p));
1345 continue;
1346 }
1347
880a6fab
CG		 1348 hlist_for_each_entry(pol, chain, bydst) {
1349 if (policy->priority >= pol->priority)
1350 newpos = &pol->bydst;
1351 else
1352 break;
1353 }
3c611d40 1354 if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
9dffff20 1355 hlist_add_behind_rcu(&policy->bydst, newpos);
880a6fab 1356 else
9dffff20 1357 hlist_add_head_rcu(&policy->bydst, chain);
880a6fab
CG		 1358 }
1359
24969fac 1360out_unlock:
6be3b0db 1361 __xfrm_policy_inexact_flush(net);
2580d3f4 1362 write_seqcount_end(&net->xfrm.xfrm_policy_hash_generation);
9d0380df 1363 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
880a6fab
CG		 1364
1365 mutex_unlock(&hash_resize_mutex);
1366}
1367
1368void xfrm_policy_hash_rebuild(struct net *net)
1369{
1370 schedule_work(&net->xfrm.policy_hthresh.work);
1371}
1372EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
1373
1da177e4
LT		 1374/* Generate new index... KAME seems to generate them ordered by cost
1375 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 1376static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 1377{
1da177e4 1378 for (;;) {
2518c7c2
DM		 1379 struct hlist_head *list;
1380 struct xfrm_policy *p;
1381 u32 idx;
1382 int found;
1383
e682adf0 1384 if (!index) {
3e4bc239
ED		 1385 idx = (net->xfrm.idx_generator | dir);
1386 net->xfrm.idx_generator += 8;
e682adf0
FD		 1387 } else {
1388 idx = index;
1389 index = 0;
1390 }
1391
1da177e4
LT		 1392 if (idx == 0)
1393 idx = 8;
1121994c 1394 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 1395 found = 0;
b67bfe0d 1396 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 1397 if (p->index == idx) {
1398 found = 1;
1da177e4 1399 break;
2518c7c2 1400 }
1da177e4 1401 }
2518c7c2 1402 if (!found)
1da177e4
LT		 1403 return idx;
1404 }
1405}
1406
2518c7c2
DM		 1407static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
1408{
1409 u32 *p1 = (u32 *) s1;
1410 u32 *p2 = (u32 *) s2;
1411 int len = sizeof(struct xfrm_selector) / sizeof(u32);
1412 int i;
1413
1414 for (i = 0; i < len; i++) {
1415 if (p1[i] != p2[i])
1416 return 1;
1417 }
1418
1419 return 0;
1420}
1421
a0073fe1
SK		 1422static void xfrm_policy_requeue(struct xfrm_policy *old,
1423 struct xfrm_policy *new)
1424{
1425 struct xfrm_policy_queue *pq = &old->polq;
1426 struct sk_buff_head list;
1427
de2ad486
LR		 1428 if (skb_queue_empty(&pq->hold_queue))
1429 return;
1430
a0073fe1
SK		 1431 __skb_queue_head_init(&list);
1432
1433 spin_lock_bh(&pq->hold_queue.lock);
1434 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 1435 if (del_timer(&pq->hold_timer))
1436 xfrm_pol_put(old);
a0073fe1
SK		 1437 spin_unlock_bh(&pq->hold_queue.lock);
1438
a0073fe1
SK		 1439 pq = &new->polq;
1440
1441 spin_lock_bh(&pq->hold_queue.lock);
1442 skb_queue_splice(&list, &pq->hold_queue);
1443 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 1444 if (!mod_timer(&pq->hold_timer, jiffies))
1445 xfrm_pol_hold(new);
a0073fe1
SK		 1446 spin_unlock_bh(&pq->hold_queue.lock);
1447}
1448
4f47e8ab
XL		 1449static inline bool xfrm_policy_mark_match(const struct xfrm_mark *mark,
1450 struct xfrm_policy *pol)
7cb8a939 1451{
4f47e8ab 1452 return mark->v == pol->mark.v && mark->m == pol->mark.m;
7cb8a939
SK		 1453}
1454
24969fac
FW		 1455static u32 xfrm_pol_bin_key(const void *data, u32 len, u32 seed)
1456{
1457 const struct xfrm_pol_inexact_key *k = data;
1458 u32 a = k->type << 24 | k->dir << 16 | k->family;
1459
b5fe22e2
FW		 1460 return jhash_3words(a, k->if_id, net_hash_mix(read_pnet(&k->net)),
1461 seed);
24969fac
FW		 1462}
1463
1464static u32 xfrm_pol_bin_obj(const void *data, u32 len, u32 seed)
1465{
1466 const struct xfrm_pol_inexact_bin *b = data;
1467
1468 return xfrm_pol_bin_key(&b->k, 0, seed);
1469}
1470
1471static int xfrm_pol_bin_cmp(struct rhashtable_compare_arg *arg,
1472 const void *ptr)
1473{
1474 const struct xfrm_pol_inexact_key *key = arg->key;
1475 const struct xfrm_pol_inexact_bin *b = ptr;
1476 int ret;
1477
1478 if (!net_eq(read_pnet(&b->k.net), read_pnet(&key->net)))
1479 return -1;
1480
1481 ret = b->k.dir ^ key->dir;
1482 if (ret)
1483 return ret;
1484
1485 ret = b->k.type ^ key->type;
1486 if (ret)
1487 return ret;
1488
1489 ret = b->k.family ^ key->family;
1490 if (ret)
1491 return ret;
1492
b5fe22e2 1493 return b->k.if_id ^ key->if_id;
24969fac
FW		 1494}
1495
1496static const struct rhashtable_params xfrm_pol_inexact_params = {
1497 .head_offset = offsetof(struct xfrm_pol_inexact_bin, head),
1498 .hashfn = xfrm_pol_bin_key,
1499 .obj_hashfn = xfrm_pol_bin_obj,
1500 .obj_cmpfn = xfrm_pol_bin_cmp,
1501 .automatic_shrinking = true,
1502};
1503
1504static void xfrm_policy_insert_inexact_list(struct hlist_head *chain,
1505 struct xfrm_policy *policy)
1506{
1507 struct xfrm_policy *pol, *delpol = NULL;
1508 struct hlist_node *newpos = NULL;
6be3b0db 1509 int i = 0;
24969fac
FW		 1510
1511 hlist_for_each_entry(pol, chain, bydst_inexact_list) {
1512 if (pol->type == policy->type &&
1513 pol->if_id == policy->if_id &&
1514 !selector_cmp(&pol->selector, &policy->selector) &&
4f47e8ab 1515 xfrm_policy_mark_match(&policy->mark, pol) &&
24969fac
FW		 1516 xfrm_sec_ctx_match(pol->security, policy->security) &&
1517 !WARN_ON(delpol)) {
1518 delpol = pol;
1519 if (policy->priority > pol->priority)
1520 continue;
1521 } else if (policy->priority >= pol->priority) {
1522 newpos = &pol->bydst_inexact_list;
1523 continue;
1524 }
1525 if (delpol)
1526 break;
1527 }
1528
3c611d40 1529 if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
24969fac
FW		 1530 hlist_add_behind_rcu(&policy->bydst_inexact_list, newpos);
1531 else
1532 hlist_add_head_rcu(&policy->bydst_inexact_list, chain);
6be3b0db
FW		 1533
1534 hlist_for_each_entry(pol, chain, bydst_inexact_list) {
1535 pol->pos = i;
1536 i++;
1537 }
24969fac
FW		 1538}
1539
a927d6af
FW		 1540static struct xfrm_policy *xfrm_policy_insert_list(struct hlist_head *chain,
1541 struct xfrm_policy *policy,
1542 bool excl)
1da177e4 1543{
a927d6af 1544 struct xfrm_policy *pol, *newpos = NULL, *delpol = NULL;
1da177e4 1545
b67bfe0d 1546 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 1547 if (pol->type == policy->type &&
7e652640 1548 pol->if_id == policy->if_id &&
2518c7c2 1549 !selector_cmp(&pol->selector, &policy->selector) &&
4f47e8ab 1550 xfrm_policy_mark_match(&policy->mark, pol) &&
a6c7ab55
HX		 1551 xfrm_sec_ctx_match(pol->security, policy->security) &&
1552 !WARN_ON(delpol)) {
a927d6af
FW		 1553 if (excl)
1554 return ERR_PTR(-EEXIST);
1da177e4
LT		 1555 delpol = pol;
1556 if (policy->priority > pol->priority)
1557 continue;
1558 } else if (policy->priority >= pol->priority) {
a927d6af 1559 newpos = pol;
1da177e4
LT		 1560 continue;
1561 }
1da177e4
LT		 1562 if (delpol)
1563 break;
1da177e4 1564 }
24969fac 1565
3c611d40 1566 if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
a927d6af 1567 hlist_add_behind_rcu(&policy->bydst, &newpos->bydst);
2518c7c2 1568 else
3c611d40
LR		 1569 /* Packet offload policies enter to the head
1570 * to speed-up lookups.
1571 */
9dffff20 1572 hlist_add_head_rcu(&policy->bydst, chain);
a927d6af
FW		 1573
1574 return delpol;
1575}
1576
1577int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
1578{
1579 struct net *net = xp_net(policy);
1580 struct xfrm_policy *delpol;
1581 struct hlist_head *chain;
1582
1583 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1584 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
24969fac 1585 if (chain)
cc1bb845 1586 delpol = xfrm_policy_insert_list(chain, policy, excl);
24969fac
FW		 1587 else
1588 delpol = xfrm_policy_inexact_insert(policy, dir, excl);
a927d6af
FW		 1589
1590 if (IS_ERR(delpol)) {
1591 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1592 return PTR_ERR(delpol);
1593 }
1594
12bfa8bd 1595 __xfrm_policy_link(policy, dir);
ca4c3fc2 1596
1597 /* After previous checking, family can either be AF_INET or AF_INET6 */
1598 if (policy->family == AF_INET)
1599 rt_genid_bump_ipv4(net);
1600 else
1601 rt_genid_bump_ipv6(net);
1602
a0073fe1
SK		 1603 if (delpol) {
1604 xfrm_policy_requeue(delpol, policy);
29fa0b30 1605 __xfrm_policy_unlink(delpol, dir);
a0073fe1 1606 }
e682adf0 1607 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 1608 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
386c5680 1609 policy->curlft.add_time = ktime_get_real_seconds();
1da177e4
LT		 1610 policy->curlft.use_time = 0;
1611 if (!mod_timer(&policy->timer, jiffies + HZ))
1612 xfrm_pol_hold(policy);
9d0380df 1613 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1614
9b78a82c 1615 if (delpol)
1da177e4 1616 xfrm_policy_kill(delpol);
1121994c
AD		 1617 else if (xfrm_bydst_should_resize(net, dir, NULL))
1618 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 1619
1da177e4
LT		 1620 return 0;
1621}
1622EXPORT_SYMBOL(xfrm_policy_insert);
1623
6be3b0db 1624static struct xfrm_policy *
4f47e8ab
XL		 1625__xfrm_policy_bysel_ctx(struct hlist_head *chain, const struct xfrm_mark *mark,
1626 u32 if_id, u8 type, int dir, struct xfrm_selector *sel,
6be3b0db
FW		 1627 struct xfrm_sec_ctx *ctx)
1628{
1629 struct xfrm_policy *pol;
1630
1631 if (!chain)
1632 return NULL;
1633
1634 hlist_for_each_entry(pol, chain, bydst) {
1635 if (pol->type == type &&
1636 pol->if_id == if_id &&
4f47e8ab 1637 xfrm_policy_mark_match(mark, pol) &&
6be3b0db
FW		 1638 !selector_cmp(sel, &pol->selector) &&
1639 xfrm_sec_ctx_match(ctx, pol->security))
1640 return pol;
1641 }
1642
1643 return NULL;
1644}
1645
4f47e8ab
XL		 1646struct xfrm_policy *
1647xfrm_policy_bysel_ctx(struct net *net, const struct xfrm_mark *mark, u32 if_id,
1648 u8 type, int dir, struct xfrm_selector *sel,
1649 struct xfrm_sec_ctx *ctx, int delete, int *err)
1da177e4 1650{
24969fac
FW		 1651 struct xfrm_pol_inexact_bin *bin = NULL;
1652 struct xfrm_policy *pol, *ret = NULL;
2518c7c2 1653 struct hlist_head *chain;
1da177e4 1654
ef41aaa0 1655 *err = 0;
9d0380df 1656 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 1657 chain = policy_hash_bysel(net, sel, sel->family, dir);
24969fac 1658 if (!chain) {
6be3b0db
FW		 1659 struct xfrm_pol_inexact_candidates cand;
1660 int i;
1661
24969fac 1662 bin = xfrm_policy_inexact_lookup(net, type,
b5fe22e2 1663 sel->family, dir, if_id);
24969fac
FW		 1664 if (!bin) {
1665 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1666 return NULL;
1667 }
1668
6be3b0db
FW		 1669 if (!xfrm_policy_find_inexact_candidates(&cand, bin,
1670 &sel->saddr,
1671 &sel->daddr)) {
1672 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1673 return NULL;
1674 }
1675
1676 pol = NULL;
1677 for (i = 0; i < ARRAY_SIZE(cand.res); i++) {
1678 struct xfrm_policy *tmp;
1679
1680 tmp = __xfrm_policy_bysel_ctx(cand.res[i], mark,
1681 if_id, type, dir,
1682 sel, ctx);
39aa6928
FW		 1683 if (!tmp)
1684 continue;
1685
1686 if (!pol || tmp->pos < pol->pos)
6be3b0db
FW		 1687 pol = tmp;
1688 }
1689 } else {
1690 pol = __xfrm_policy_bysel_ctx(chain, mark, if_id, type, dir,
1691 sel, ctx);
24969fac
FW		 1692 }
1693
6be3b0db
FW		 1694 if (pol) {
1695 xfrm_pol_hold(pol);
1696 if (delete) {
1697 *err = security_xfrm_policy_delete(pol->security);
1698 if (*err) {
1699 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1700 return pol;
2518c7c2 1701 }
6be3b0db 1702 __xfrm_policy_unlink(pol, dir);
1da177e4 1703 }
6be3b0db 1704 ret = pol;
1da177e4 1705 }
9d0380df 1706 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1707
fe1a5f03 1708 if (ret && delete)
2518c7c2 1709 xfrm_policy_kill(ret);
6be3b0db
FW		 1710 if (bin && delete)
1711 xfrm_policy_inexact_prune_bin(bin);
2518c7c2 1712 return ret;
1da177e4 1713}
df71837d 1714EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 1715
4f47e8ab
XL		 1716struct xfrm_policy *
1717xfrm_policy_byid(struct net *net, const struct xfrm_mark *mark, u32 if_id,
1718 u8 type, int dir, u32 id, int delete, int *err)
1da177e4 1719{
2518c7c2
DM		 1720 struct xfrm_policy *pol, *ret;
1721 struct hlist_head *chain;
1da177e4 1722
b5505c6e
HX		 1723 *err = -ENOENT;
1724 if (xfrm_policy_id2dir(id) != dir)
1725 return NULL;
1726
ef41aaa0 1727 *err = 0;
9d0380df 1728 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 1729 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 1730 ret = NULL;
b67bfe0d 1731 hlist_for_each_entry(pol, chain, byidx) {
34f8d884 1732 if (pol->type == type && pol->index == id &&
4f47e8ab 1733 pol->if_id == if_id && xfrm_policy_mark_match(mark, pol)) {
1da177e4 1734 xfrm_pol_hold(pol);
2518c7c2 1735 if (delete) {
03e1ad7b
PM		 1736 *err = security_xfrm_policy_delete(
1737 pol->security);
ef41aaa0 1738 if (*err) {
9d0380df 1739 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 1740 return pol;
1741 }
29fa0b30 1742 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 1743 }
1744 ret = pol;
1da177e4
LT		 1745 break;
1746 }
1747 }
9d0380df 1748 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1749
fe1a5f03 1750 if (ret && delete)
2518c7c2 1751 xfrm_policy_kill(ret);
2518c7c2 1752 return ret;
1da177e4
LT		 1753}
1754EXPORT_SYMBOL(xfrm_policy_byid);
1755
4aa2e62c
JL		 1756#ifdef CONFIG_SECURITY_NETWORK_XFRM
1757static inline int
2e71029e 1758xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
1da177e4 1759{
ceb159e3
FW		 1760 struct xfrm_policy *pol;
1761 int err = 0;
4aa2e62c 1762
ceb159e3
FW		 1763 list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
1764 if (pol->walk.dead ||
1765 xfrm_policy_id2dir(pol->index) >= XFRM_POLICY_MAX ||
1766 pol->type != type)
1767 continue;
4aa2e62c 1768
ceb159e3
FW		 1769 err = security_xfrm_policy_delete(pol->security);
1770 if (err) {
1771 xfrm_audit_policy_delete(pol, 0, task_valid);
1772 return err;
4aa2e62c
JL		 1773 }
1774 }
1775 return err;
1776}
919e43fa
LR		 1777
1778static inline int xfrm_dev_policy_flush_secctx_check(struct net *net,
1779 struct net_device *dev,
1780 bool task_valid)
1781{
1782 struct xfrm_policy *pol;
1783 int err = 0;
1784
1785 list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
1786 if (pol->walk.dead ||
1787 xfrm_policy_id2dir(pol->index) >= XFRM_POLICY_MAX ||
1788 pol->xdo.dev != dev)
1789 continue;
1790
1791 err = security_xfrm_policy_delete(pol->security);
1792 if (err) {
1793 xfrm_audit_policy_delete(pol, 0, task_valid);
1794 return err;
1795 }
1796 }
1797 return err;
1798}
4aa2e62c
JL		 1799#else
1800static inline int
2e71029e 1801xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
4aa2e62c
JL		 1802{
1803 return 0;
1804}
919e43fa
LR		 1805
1806static inline int xfrm_dev_policy_flush_secctx_check(struct net *net,
1807 struct net_device *dev,
1808 bool task_valid)
1809{
1810 return 0;
1811}
4aa2e62c
JL		 1812#endif
1813
2e71029e 1814int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
4aa2e62c 1815{
2f1eb65f 1816 int dir, err = 0, cnt = 0;
ceb159e3 1817 struct xfrm_policy *pol;
1da177e4 1818
9d0380df 1819 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 1820
2e71029e 1821 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
4aa2e62c
JL		 1822 if (err)
1823 goto out;
1824
ceb159e3
FW		 1825again:
1826 list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
6d41d4fe
DC		 1827 if (pol->walk.dead)
1828 continue;
1829
ceb159e3 1830 dir = xfrm_policy_id2dir(pol->index);
6d41d4fe 1831 if (dir >= XFRM_POLICY_MAX ||
ceb159e3
FW		 1832 pol->type != type)
1833 continue;
2518c7c2 1834
ceb159e3
FW		 1835 __xfrm_policy_unlink(pol, dir);
1836 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
bf06fcf4 1837 xfrm_dev_policy_delete(pol);
ceb159e3
FW		 1838 cnt++;
1839 xfrm_audit_policy_delete(pol, 1, task_valid);
1840 xfrm_policy_kill(pol);
1841 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1842 goto again;
1da177e4 1843 }
24969fac
FW		 1844 if (cnt)
1845 __xfrm_policy_inexact_flush(net);
1846 else
2f1eb65f 1847 err = -ESRCH;
4aa2e62c 1848out:
9d0380df 1849 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 1850 return err;
1da177e4
LT		 1851}
1852EXPORT_SYMBOL(xfrm_policy_flush);
1853
919e43fa
LR		 1854int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
1855 bool task_valid)
1856{
1857 int dir, err = 0, cnt = 0;
1858 struct xfrm_policy *pol;
1859
1860 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1861
1862 err = xfrm_dev_policy_flush_secctx_check(net, dev, task_valid);
1863 if (err)
1864 goto out;
1865
1866again:
1867 list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
6d41d4fe
DC		 1868 if (pol->walk.dead)
1869 continue;
1870
919e43fa 1871 dir = xfrm_policy_id2dir(pol->index);
6d41d4fe 1872 if (dir >= XFRM_POLICY_MAX ||
919e43fa
LR		 1873 pol->xdo.dev != dev)
1874 continue;
1875
1876 __xfrm_policy_unlink(pol, dir);
1877 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
bf06fcf4 1878 xfrm_dev_policy_delete(pol);
919e43fa
LR		 1879 cnt++;
1880 xfrm_audit_policy_delete(pol, 1, task_valid);
1881 xfrm_policy_kill(pol);
1882 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1883 goto again;
1884 }
1885 if (cnt)
1886 __xfrm_policy_inexact_flush(net);
1887 else
1888 err = -ESRCH;
1889out:
1890 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1891 return err;
1892}
1893EXPORT_SYMBOL(xfrm_dev_policy_flush);
1894
cdcbca7c 1895int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 1896 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 1897 void *data)
1898{
12a169e7
HX		 1899 struct xfrm_policy *pol;
1900 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 1901 int error = 0;
1902
1903 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1904 walk->type != XFRM_POLICY_TYPE_ANY)
1905 return -EINVAL;
1da177e4 1906
12a169e7 1907 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 1908 return 0;
1909
9d0380df 1910 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 1911 if (list_empty(&walk->walk.all))
cdcbca7c 1912 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7 1913 else
80077702
LR		 1914 x = list_first_entry(&walk->walk.all,
1915 struct xfrm_policy_walk_entry, all);
1916
cdcbca7c 1917 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 1918 if (x->dead)
4c563f76 1919 continue;
12a169e7
HX		 1920 pol = container_of(x, struct xfrm_policy, walk);
1921 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1922 walk->type != pol->type)
1923 continue;
1924 error = func(pol, xfrm_policy_id2dir(pol->index),
1925 walk->seq, data);
1926 if (error) {
1927 list_move_tail(&walk->walk.all, &x->all);
1928 goto out;
2518c7c2 1929 }
12a169e7 1930 walk->seq++;
1da177e4 1931 }
12a169e7 1932 if (walk->seq == 0) {
baf5d743
JHS		 1933 error = -ENOENT;
1934 goto out;
1935 }
12a169e7 1936 list_del_init(&walk->walk.all);
1da177e4 1937out:
9d0380df 1938 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1939 return error;
1940}
1941EXPORT_SYMBOL(xfrm_policy_walk);
1942
12a169e7
HX		 1943void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1944{
1945 INIT_LIST_HEAD(&walk->walk.all);
1946 walk->walk.dead = 1;
1947 walk->type = type;
1948 walk->seq = 0;
1949}
1950EXPORT_SYMBOL(xfrm_policy_walk_init);
1951
283bc9f3 1952void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 1953{
1954 if (list_empty(&walk->walk.all))
1955 return;
1956
9d0380df 1957 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 1958 list_del(&walk->walk.all);
9d0380df 1959 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 1960}
1961EXPORT_SYMBOL(xfrm_policy_walk_done);
1962
134b0fc5
JM		 1963/*
1964 * Find policy to apply to this flow.
1965 *
1966 * Returns 0 if policy found, else an -errno.
1967 */
f299d557
DM		 1968static int xfrm_policy_match(const struct xfrm_policy *pol,
1969 const struct flowi *fl,
0de19788 1970 u8 type, u16 family, u32 if_id)
1da177e4 1971{
f299d557 1972 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 1973 int ret = -ESRCH;
1974 bool match;
1da177e4 1975
2518c7c2 1976 if (pol->family != family ||
bc56b334 1977 pol->if_id != if_id ||
1d28f42c 1978 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 1979 pol->type != type)
134b0fc5 1980 return ret;
1da177e4 1981
2518c7c2 1982 match = xfrm_selector_match(sel, fl, family);
134b0fc5 1983 if (match)
8a922805 1984 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid);
134b0fc5 1985 return ret;
2518c7c2 1986}
1da177e4 1987
9cf545eb
FW		 1988static struct xfrm_pol_inexact_node *
1989xfrm_policy_lookup_inexact_addr(const struct rb_root *r,
77cc278f 1990 seqcount_spinlock_t *count,
9cf545eb
FW		 1991 const xfrm_address_t *addr, u16 family)
1992{
1993 const struct rb_node *parent;
1994 int seq;
1995
1996again:
1997 seq = read_seqcount_begin(count);
1998
1999 parent = rcu_dereference_raw(r->rb_node);
2000 while (parent) {
2001 struct xfrm_pol_inexact_node *node;
2002 int delta;
2003
2004 node = rb_entry(parent, struct xfrm_pol_inexact_node, node);
2005
2006 delta = xfrm_policy_addr_delta(addr, &node->addr,
2007 node->prefixlen, family);
2008 if (delta < 0) {
2009 parent = rcu_dereference_raw(parent->rb_left);
2010 continue;
2011 } else if (delta > 0) {
2012 parent = rcu_dereference_raw(parent->rb_right);
2013 continue;
2014 }
2015
2016 return node;
2017 }
2018
2019 if (read_seqcount_retry(count, seq))
2020 goto again;
2021
2022 return NULL;
2023}
2024
6be3b0db
FW		 2025static bool
2026xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand,
2027 struct xfrm_pol_inexact_bin *b,
2028 const xfrm_address_t *saddr,
2029 const xfrm_address_t *daddr)
2030{
9cf545eb
FW		 2031 struct xfrm_pol_inexact_node *n;
2032 u16 family;
2033
6be3b0db
FW		 2034 if (!b)
2035 return false;
2036
9cf545eb 2037 family = b->k.family;
6be3b0db
FW		 2038 memset(cand, 0, sizeof(*cand));
2039 cand->res[XFRM_POL_CAND_ANY] = &b->hhead;
9cf545eb
FW		 2040
2041 n = xfrm_policy_lookup_inexact_addr(&b->root_d, &b->count, daddr,
2042 family);
6ac098b2 2043 if (n) {
9cf545eb 2044 cand->res[XFRM_POL_CAND_DADDR] = &n->hhead;
6ac098b2
FW		 2045 n = xfrm_policy_lookup_inexact_addr(&n->root, &b->count, saddr,
2046 family);
2047 if (n)
2048 cand->res[XFRM_POL_CAND_BOTH] = &n->hhead;
2049 }
9cf545eb 2050
64a09a7b
FW		 2051 n = xfrm_policy_lookup_inexact_addr(&b->root_s, &b->count, saddr,
2052 family);
2053 if (n)
2054 cand->res[XFRM_POL_CAND_SADDR] = &n->hhead;
2055
6be3b0db
FW		 2056 return true;
2057}
2058
24969fac 2059static struct xfrm_pol_inexact_bin *
b5fe22e2
FW		 2060xfrm_policy_inexact_lookup_rcu(struct net *net, u8 type, u16 family,
2061 u8 dir, u32 if_id)
24969fac
FW		 2062{
2063 struct xfrm_pol_inexact_key k = {
2064 .family = family,
2065 .type = type,
2066 .dir = dir,
b5fe22e2 2067 .if_id = if_id,
24969fac
FW		 2068 };
2069
2070 write_pnet(&k.net, net);
2071
2072 return rhashtable_lookup(&xfrm_policy_inexact_table, &k,
2073 xfrm_pol_inexact_params);
2074}
2075
2076static struct xfrm_pol_inexact_bin *
b5fe22e2
FW		 2077xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family,
2078 u8 dir, u32 if_id)
24969fac
FW		 2079{
2080 struct xfrm_pol_inexact_bin *bin;
2081
2082 lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
2083
2084 rcu_read_lock();
b5fe22e2 2085 bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id);
24969fac
FW		 2086 rcu_read_unlock();
2087
2088 return bin;
2089}
2090
6be3b0db
FW		 2091static struct xfrm_policy *
2092__xfrm_policy_eval_candidates(struct hlist_head *chain,
2093 struct xfrm_policy *prefer,
2094 const struct flowi *fl,
0de19788 2095 u8 type, u16 family, u32 if_id)
6be3b0db
FW		 2096{
2097 u32 priority = prefer ? prefer->priority : ~0u;
2098 struct xfrm_policy *pol;
2099
2100 if (!chain)
2101 return NULL;
2102
2103 hlist_for_each_entry_rcu(pol, chain, bydst) {
2104 int err;
2105
2106 if (pol->priority > priority)
2107 break;
2108
0de19788 2109 err = xfrm_policy_match(pol, fl, type, family, if_id);
6be3b0db
FW		 2110 if (err) {
2111 if (err != -ESRCH)
2112 return ERR_PTR(err);
2113
2114 continue;
2115 }
2116
2117 if (prefer) {
2118 /* matches. Is it older than *prefer? */
2119 if (pol->priority == priority &&
2120 prefer->pos < pol->pos)
2121 return prefer;
2122 }
2123
2124 return pol;
2125 }
2126
2127 return NULL;
2128}
2129
2130static struct xfrm_policy *
2131xfrm_policy_eval_candidates(struct xfrm_pol_inexact_candidates *cand,
2132 struct xfrm_policy *prefer,
2133 const struct flowi *fl,
0de19788 2134 u8 type, u16 family, u32 if_id)
6be3b0db
FW		 2135{
2136 struct xfrm_policy *tmp;
2137 int i;
2138
2139 for (i = 0; i < ARRAY_SIZE(cand->res); i++) {
2140 tmp = __xfrm_policy_eval_candidates(cand->res[i],
2141 prefer,
0de19788 2142 fl, type, family, if_id);
6be3b0db
FW		 2143 if (!tmp)
2144 continue;
2145
2146 if (IS_ERR(tmp))
2147 return tmp;
2148 prefer = tmp;
2149 }
2150
2151 return prefer;
2152}
2153
52479b62 2154static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 2155 const struct flowi *fl,
bc56b334
BW		 2156 u16 family, u8 dir,
2157 u32 if_id)
2518c7c2 2158{
6be3b0db 2159 struct xfrm_pol_inexact_candidates cand;
0b597e7e 2160 const xfrm_address_t *daddr, *saddr;
24969fac
FW		 2161 struct xfrm_pol_inexact_bin *bin;
2162 struct xfrm_policy *pol, *ret;
2518c7c2 2163 struct hlist_head *chain;
30846090 2164 unsigned int sequence;
24969fac 2165 int err;
df71837d 2166
2518c7c2
DM		 2167 daddr = xfrm_flowi_daddr(fl, family);
2168 saddr = xfrm_flowi_saddr(fl, family);
2169 if (unlikely(!daddr || !saddr))
2170 return NULL;
2171
d7b04089 2172 rcu_read_lock();
eaf22826
SK		 2173 retry:
2174 do {
2580d3f4 2175 sequence = read_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation);
eaf22826 2176 chain = policy_hash_direct(net, daddr, saddr, family, dir);
2580d3f4 2177 } while (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence));
30846090 2178
2518c7c2 2179 ret = NULL;
a5eefc1d 2180 hlist_for_each_entry_rcu(pol, chain, bydst) {
0de19788 2181 err = xfrm_policy_match(pol, fl, type, family, if_id);
134b0fc5
JM		 2182 if (err) {
2183 if (err == -ESRCH)
2184 continue;
2185 else {
2186 ret = ERR_PTR(err);
2187 goto fail;
2188 }
2189 } else {
2518c7c2
DM		 2190 ret = pol;
2191 break;
2192 }
2193 }
3c611d40
LR		 2194 if (ret && ret->xdo.type == XFRM_DEV_OFFLOAD_PACKET)
2195 goto skip_inexact;
2196
b5fe22e2 2197 bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id);
6be3b0db
FW		 2198 if (!bin || !xfrm_policy_find_inexact_candidates(&cand, bin, saddr,
2199 daddr))
24969fac 2200 goto skip_inexact;
8faf491e 2201
6be3b0db 2202 pol = xfrm_policy_eval_candidates(&cand, ret, fl, type,
0de19788 2203 family, if_id);
6be3b0db
FW		 2204 if (pol) {
2205 ret = pol;
2206 if (IS_ERR(pol))
2207 goto fail;
1da177e4 2208 }
586f2eb4 2209
24969fac 2210skip_inexact:
2580d3f4 2211 if (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence))
30846090
FW		 2212 goto retry;
2213
eaf22826 2214 if (ret && !xfrm_pol_hold_rcu(ret))
e37cc8ad 2215 goto retry;
134b0fc5 2216fail:
a7c44247 2217 rcu_read_unlock();
4e81bb83 2218
2518c7c2 2219 return ret;
4e81bb83
MN		 2220}
2221
bc56b334
BW		 2222static struct xfrm_policy *xfrm_policy_lookup(struct net *net,
2223 const struct flowi *fl,
2224 u16 family, u8 dir, u32 if_id)
80c802f3
TT		 2225{
2226#ifdef CONFIG_XFRM_SUB_POLICY
2227 struct xfrm_policy *pol;
2228
bc56b334
BW		 2229 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family,
2230 dir, if_id);
80c802f3
TT		 2231 if (pol != NULL)
2232 return pol;
2233#endif
bc56b334
BW		 2234 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family,
2235 dir, if_id);
80c802f3
TT		 2236}
2237
6f9c9615 2238static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
bc56b334
BW		 2239 const struct flowi *fl,
2240 u16 family, u32 if_id)
1da177e4
LT		 2241{
2242 struct xfrm_policy *pol;
2243
d188ba86 2244 rcu_read_lock();
ae33786f 2245 again:
d188ba86
ED		 2246 pol = rcu_dereference(sk->sk_policy[dir]);
2247 if (pol != NULL) {
ddc47e44 2248 bool match;
a716c119 2249 int err = 0;
df71837d 2250
ddc47e44
SK		 2251 if (pol->family != family) {
2252 pol = NULL;
2253 goto out;
2254 }
2255
2256 match = xfrm_selector_match(&pol->selector, fl, family);
3bccfbc7 2257 if (match) {
3c5b4d69 2258 if ((READ_ONCE(sk->sk_mark) & pol->mark.m) != pol->mark.v ||
bc56b334 2259 pol->if_id != if_id) {
34f8d884
JHS		 2260 pol = NULL;
2261 goto out;
2262 }
03e1ad7b 2263 err = security_xfrm_policy_lookup(pol->security,
8a922805 2264 fl->flowi_secid);
330e832a
FW		 2265 if (!err) {
2266 if (!xfrm_pol_hold_rcu(pol))
2267 goto again;
2268 } else if (err == -ESRCH) {
3bccfbc7 2269 pol = NULL;
330e832a 2270 } else {
3bccfbc7 2271 pol = ERR_PTR(err);
330e832a 2272 }
3bccfbc7 2273 } else
1da177e4
LT		 2274 pol = NULL;
2275 }
34f8d884 2276out:
d188ba86 2277 rcu_read_unlock();
1da177e4
LT		 2278 return pol;
2279}
2280
2281static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
2282{
98806f75 2283 struct net *net = xp_net(pol);
4e81bb83 2284
98806f75 2285 list_add(&pol->walk.all, &net->xfrm.policy_all);
98806f75 2286 net->xfrm.policy_count[dir]++;
1da177e4
LT		 2287 xfrm_pol_hold(pol);
2288}
2289
2290static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
2291 int dir)
2292{
98806f75
AD		 2293 struct net *net = xp_net(pol);
2294
53c2e285 2295 if (list_empty(&pol->walk.all))
2518c7c2 2296 return NULL;
1da177e4 2297
53c2e285
HX		 2298 /* Socket policies are not hashed. */
2299 if (!hlist_unhashed(&pol->bydst)) {
a5eefc1d 2300 hlist_del_rcu(&pol->bydst);
24969fac 2301 hlist_del_init(&pol->bydst_inexact_list);
53c2e285
HX		 2302 hlist_del(&pol->byidx);
2303 }
2304
2305 list_del_init(&pol->walk.all);
98806f75 2306 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 2307
2308 return pol;
1da177e4
LT		 2309}
2310
53c2e285
HX		 2311static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
2312{
2313 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
2314}
2315
2316static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
2317{
2318 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
2319}
2320
4666faab 2321int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 2322{
283bc9f3
FD		 2323 struct net *net = xp_net(pol);
2324
9d0380df 2325 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 2326 pol = __xfrm_policy_unlink(pol, dir);
9d0380df 2327 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 2328 if (pol) {
919e43fa 2329 xfrm_dev_policy_delete(pol);
1da177e4 2330 xfrm_policy_kill(pol);
4666faab 2331 return 0;
1da177e4 2332 }
4666faab 2333 return -ENOENT;
1da177e4 2334}
a70fcb0b 2335EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 2336
2337int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
2338{
be8f8284 2339 struct net *net = sock_net(sk);
1da177e4
LT		 2340 struct xfrm_policy *old_pol;
2341
4e81bb83
MN		 2342#ifdef CONFIG_XFRM_SUB_POLICY
2343 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
2344 return -EINVAL;
2345#endif
2346
9d0380df 2347 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
d188ba86
ED		 2348 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
2349 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
1da177e4 2350 if (pol) {
386c5680 2351 pol->curlft.add_time = ktime_get_real_seconds();
e682adf0 2352 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
53c2e285 2353 xfrm_sk_policy_link(pol, dir);
1da177e4 2354 }
d188ba86 2355 rcu_assign_pointer(sk->sk_policy[dir], pol);
a0073fe1
SK		 2356 if (old_pol) {
2357 if (pol)
2358 xfrm_policy_requeue(old_pol, pol);
2359
ea2dea9d
TT		 2360 /* Unlinking succeeds always. This is the only function
2361 * allowed to delete or replace socket policy.
2362 */
53c2e285 2363 xfrm_sk_policy_unlink(old_pol, dir);
a0073fe1 2364 }
9d0380df 2365 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 2366
2367 if (old_pol) {
2368 xfrm_policy_kill(old_pol);
2369 }
2370 return 0;
2371}
2372
d3e40a9f 2373static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 2374{
0331b1f3 2375 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 2376 struct net *net = xp_net(old);
1da177e4
LT		 2377
2378 if (newp) {
2379 newp->selector = old->selector;
03e1ad7b
PM		 2380 if (security_xfrm_policy_clone(old->security,
2381 &newp->security)) {
df71837d
TJ		 2382 kfree(newp);
2383 return NULL; /* ENOMEM */
2384 }
1da177e4
LT		 2385 newp->lft = old->lft;
2386 newp->curlft = old->curlft;
fb977e2c 2387 newp->mark = old->mark;
7e652640 2388 newp->if_id = old->if_id;
1da177e4
LT		 2389 newp->action = old->action;
2390 newp->flags = old->flags;
2391 newp->xfrm_nr = old->xfrm_nr;
2392 newp->index = old->index;
4e81bb83 2393 newp->type = old->type;
0e74aa1d 2394 newp->family = old->family;
1da177e4
LT		 2395 memcpy(newp->xfrm_vec, old->xfrm_vec,
2396 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
9d0380df 2397 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
53c2e285 2398 xfrm_sk_policy_link(newp, dir);
9d0380df 2399 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 2400 xfrm_pol_put(newp);
2401 }
2402 return newp;
2403}
2404
d188ba86 2405int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
1da177e4 2406{
d188ba86
ED		 2407 const struct xfrm_policy *p;
2408 struct xfrm_policy *np;
2409 int i, ret = 0;
2410
2411 rcu_read_lock();
2412 for (i = 0; i < 2; i++) {
2413 p = rcu_dereference(osk->sk_policy[i]);
2414 if (p) {
2415 np = clone_policy(p, i);
2416 if (unlikely(!np)) {
2417 ret = -ENOMEM;
2418 break;
2419 }
2420 rcu_assign_pointer(sk->sk_policy[i], np);
2421 }
2422 }
2423 rcu_read_unlock();
2424 return ret;
1da177e4
LT		 2425}
2426
a1e59abf 2427static int
42a7b32b 2428xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
077fbac4 2429 xfrm_address_t *remote, unsigned short family, u32 mark)
a1e59abf
PM		 2430{
2431 int err;
37b10383 2432 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
a1e59abf
PM		 2433
2434 if (unlikely(afinfo == NULL))
2435 return -EINVAL;
077fbac4 2436 err = afinfo->get_saddr(net, oif, local, remote, mark);
bdba9fe0 2437 rcu_read_unlock();
a1e59abf
PM		 2438 return err;
2439}
2440
1da177e4
LT		 2441/* Resolve list of templates for the flow, given policy. */
2442
2443static int
a6c2e611
DM		 2444xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
2445 struct xfrm_state **xfrm, unsigned short family)
1da177e4 2446{
fbda33b2 2447 struct net *net = xp_net(policy);
1da177e4
LT		 2448 int nx;
2449 int i, error;
94802151
SK		 2450 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
2451 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 2452 xfrm_address_t tmp;
1da177e4 2453
9b7a787d 2454 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4 2455 struct xfrm_state *x;
94802151
SK		 2456 xfrm_address_t *remote = daddr;
2457 xfrm_address_t *local = saddr;
1da177e4
LT		 2458 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
2459
94802151
SK		 2460 if (tmpl->mode == XFRM_MODE_TUNNEL ||
2461 tmpl->mode == XFRM_MODE_BEET) {
2462 remote = &tmpl->id.daddr;
2463 local = &tmpl->saddr;
2464 if (xfrm_addr_any(local, tmpl->encap_family)) {
2465 error = xfrm_get_saddr(net, fl->flowi_oif,
2466 &tmp, remote,
2467 tmpl->encap_family, 0);
2468 if (error)
2469 goto fail;
2470 local = &tmp;
2471 }
1da177e4
LT		 2472 }
2473
bc56b334
BW		 2474 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error,
2475 family, policy->if_id);
1da177e4
LT		 2476
2477 if (x && x->km.state == XFRM_STATE_VALID) {
2478 xfrm[nx++] = x;
94802151
SK		 2479 daddr = remote;
2480 saddr = local;
1da177e4
LT		 2481 continue;
2482 }
2483 if (x) {
2484 error = (x->km.state == XFRM_STATE_ERROR ?
2485 -EINVAL : -EAGAIN);
2486 xfrm_state_put(x);
42054569 2487 } else if (error == -ESRCH) {
a4322266 2488 error = -EAGAIN;
42054569 2489 }
1da177e4
LT		 2490
2491 if (!tmpl->optional)
2492 goto fail;
2493 }
2494 return nx;
2495
2496fail:
9b7a787d 2497 for (nx--; nx >= 0; nx--)
1da177e4
LT		 2498 xfrm_state_put(xfrm[nx]);
2499 return error;
2500}
2501
4e81bb83 2502static int
a6c2e611
DM		 2503xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
2504 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 2505{
41a49cc3
MN		 2506 struct xfrm_state *tp[XFRM_MAX_DEPTH];
2507 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 2508 int cnx = 0;
2509 int error;
2510 int ret;
2511 int i;
2512
2513 for (i = 0; i < npols; i++) {
2514 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
2515 error = -ENOBUFS;
2516 goto fail;
2517 }
41a49cc3
MN		 2518
2519 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 2520 if (ret < 0) {
2521 error = ret;
2522 goto fail;
2523 } else
2524 cnx += ret;
2525 }
2526
41a49cc3
MN		 2527 /* found states are sorted for outbound processing */
2528 if (npols > 1)
2529 xfrm_state_sort(xfrm, tpp, cnx, family);
2530
4e81bb83
MN		 2531 return cnx;
2532
2533 fail:
9b7a787d 2534 for (cnx--; cnx >= 0; cnx--)
41a49cc3 2535 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 2536 return error;
2537
2538}
2539
f5e2bb4f 2540static int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286 2541{
f24ea528
FW		 2542 if (family == AF_INET)
2543 return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos;
143a4454 2544
f24ea528 2545 return 0;
25ee3286
HX		 2546}
2547
d7c7544c 2548static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 2549{
37b10383 2550 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 2551 struct dst_ops *dst_ops;
25ee3286
HX		 2552 struct xfrm_dst *xdst;
2553
2554 if (!afinfo)
2555 return ERR_PTR(-EINVAL);
2556
d7c7544c
AD		 2557 switch (family) {
2558 case AF_INET:
2559 dst_ops = &net->xfrm.xfrm4_dst_ops;
2560 break;
dfd56b8b 2561#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 2562 case AF_INET6:
2563 dst_ops = &net->xfrm.xfrm6_dst_ops;
2564 break;
2565#endif
2566 default:
2567 BUG();
2568 }
b2a9c0ed 2569 xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
25ee3286 2570
d4cae562 2571 if (likely(xdst)) {
caf283d0 2572 memset_after(xdst, 0, u.dst);
d4cae562 2573 } else
0b150932 2574 xdst = ERR_PTR(-ENOBUFS);
80c802f3 2575
bdba9fe0 2576 rcu_read_unlock();
d4cae562 2577
25ee3286
HX		 2578 return xdst;
2579}
2580
2e8b4aa8
FW		 2581static void xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
2582 int nfheader_len)
a1b05140 2583{
2e8b4aa8
FW		 2584 if (dst->ops->family == AF_INET6) {
2585 struct rt6_info *rt = (struct rt6_info *)dst;
2586 path->path_cookie = rt6_get_cookie(rt);
2587 path->u.rt6.rt6i_nfheader_len = nfheader_len;
2588 }
a1b05140
MN		 2589}
2590
87c1e12b 2591static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 2592 const struct flowi *fl)
25ee3286 2593{
37b10383 2594 const struct xfrm_policy_afinfo *afinfo =
25ee3286
HX		 2595 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
2596 int err;
2597
2598 if (!afinfo)
1da177e4 2599 return -EINVAL;
25ee3286 2600
87c1e12b 2601 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 2602
bdba9fe0 2603 rcu_read_unlock();
25ee3286 2604
1da177e4
LT		 2605 return err;
2606}
2607
80c802f3 2608
25ee3286
HX		 2609/* Allocate chain of dst_entry's, attach known xfrm's, calculate
2610 * all the metrics... Shortly, bundle a bundle.
2611 */
2612
2613static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
5492093d
DM		 2614 struct xfrm_state **xfrm,
2615 struct xfrm_dst **bundle,
2616 int nx,
98313ada 2617 const struct flowi *fl,
25ee3286
HX		 2618 struct dst_entry *dst)
2619{
733a5fac 2620 const struct xfrm_state_afinfo *afinfo;
4c145dce 2621 const struct xfrm_mode *inner_mode;
d7c7544c 2622 struct net *net = xp_net(policy);
25ee3286
HX		 2623 unsigned long now = jiffies;
2624 struct net_device *dev;
45b018be
DM		 2625 struct xfrm_dst *xdst_prev = NULL;
2626 struct xfrm_dst *xdst0 = NULL;
25ee3286
HX		 2627 int i = 0;
2628 int err;
2629 int header_len = 0;
a1b05140 2630 int nfheader_len = 0;
25ee3286
HX		 2631 int trailer_len = 0;
2632 int tos;
2633 int family = policy->selector.family;
9bb182a7
YH		 2634 xfrm_address_t saddr, daddr;
2635
2636 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 2637
2638 tos = xfrm_get_tos(fl, family);
25ee3286
HX		 2639
2640 dst_hold(dst);
2641
2642 for (; i < nx; i++) {
d7c7544c 2643 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 2644 struct dst_entry *dst1 = &xdst->u.dst;
2645
2646 err = PTR_ERR(xdst);
2647 if (IS_ERR(xdst)) {
2648 dst_release(dst);
2649 goto put_states;
2650 }
2651
5492093d 2652 bundle[i] = xdst;
45b018be
DM		 2653 if (!xdst_prev)
2654 xdst0 = xdst;
10a7ef33
DM		 2655 else
2656 /* Ref count is taken during xfrm_alloc_dst()
2657 * No need to do dst_clone() on dst1
2658 */
45b018be 2659 xfrm_dst_set_child(xdst_prev, &xdst->u.dst);
10a7ef33 2660
43a4dea4
SK		 2661 if (xfrm[i]->sel.family == AF_UNSPEC) {
2662 inner_mode = xfrm_ip2inner_mode(xfrm[i],
2663 xfrm_af2proto(family));
2664 if (!inner_mode) {
2665 err = -EAFNOSUPPORT;
2666 dst_release(dst);
2667 goto put_states;
2668 }
2669 } else
c9500d7b 2670 inner_mode = &xfrm[i]->inner_mode;
43a4dea4 2671
25ee3286 2672 xdst->route = dst;
defb3519 2673 dst_copy_metrics(dst1, dst);
25ee3286
HX		 2674
2675 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
e2612cd4 2676 __u32 mark = 0;
748b82c2 2677 int oif;
e2612cd4
BW		 2678
2679 if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m)
2680 mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
9b42c1f1 2681
25ee3286 2682 family = xfrm[i]->props.family;
748b82c2
DA		 2683 oif = fl->flowi_oif ? : fl->flowi_l3mdev;
2684 dst = xfrm_dst_lookup(xfrm[i], tos, oif,
9b42c1f1 2685 &saddr, &daddr, family, mark);
25ee3286
HX		 2686 err = PTR_ERR(dst);
2687 if (IS_ERR(dst))
2688 goto put_states;
2689 } else
2690 dst_hold(dst);
2691
2692 dst1->xfrm = xfrm[i];
80c802f3 2693 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 2694
f5b0a874 2695 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 2696 dst1->lastuse = now;
2697
2698 dst1->input = dst_discard;
733a5fac
FW		 2699
2700 rcu_read_lock();
2701 afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family);
2702 if (likely(afinfo))
2703 dst1->output = afinfo->output;
2704 else
2705 dst1->output = dst_discard_out;
2706 rcu_read_unlock();
25ee3286 2707
45b018be 2708 xdst_prev = xdst;
25ee3286
HX		 2709
2710 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 2711 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
2712 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 2713 trailer_len += xfrm[i]->props.trailer_len;
2714 }
2715
45b018be 2716 xfrm_dst_set_child(xdst_prev, dst);
0f6c480f 2717 xdst0->path = dst;
25ee3286
HX		 2718
2719 err = -ENODEV;
2720 dev = dst->dev;
2721 if (!dev)
2722 goto free_dst;
2723
45b018be 2724 xfrm_init_path(xdst0, dst, nfheader_len);
5492093d 2725 xfrm_init_pmtu(bundle, nx);
25ee3286 2726
45b018be
DM		 2727 for (xdst_prev = xdst0; xdst_prev != (struct xfrm_dst *)dst;
2728 xdst_prev = (struct xfrm_dst *) xfrm_dst_child(&xdst_prev->u.dst)) {
2729 err = xfrm_fill_dst(xdst_prev, dev, fl);
25ee3286
HX		 2730 if (err)
2731 goto free_dst;
2732
45b018be
DM		 2733 xdst_prev->u.dst.header_len = header_len;
2734 xdst_prev->u.dst.trailer_len = trailer_len;
2735 header_len -= xdst_prev->u.dst.xfrm->props.header_len;
2736 trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len;
25ee3286
HX		 2737 }
2738
45b018be 2739 return &xdst0->u.dst;
25ee3286
HX		 2740
2741put_states:
2742 for (; i < nx; i++)
2743 xfrm_state_put(xfrm[i]);
2744free_dst:
45b018be
DM		 2745 if (xdst0)
2746 dst_release_immediate(&xdst0->u.dst);
38369f54
SK		 2747
2748 return ERR_PTR(err);
25ee3286
HX		 2749}
2750
73ff93cd 2751static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 2752 struct xfrm_policy **pols,
2753 int *num_pols, int *num_xfrms)
2754{
2755 int i;
2756
2757 if (*num_pols == 0 || !pols[0]) {
2758 *num_pols = 0;
2759 *num_xfrms = 0;
2760 return 0;
2761 }
f85daf0e
HH		 2762 if (IS_ERR(pols[0])) {
2763 *num_pols = 0;
80c802f3 2764 return PTR_ERR(pols[0]);
f85daf0e 2765 }
80c802f3
TT		 2766
2767 *num_xfrms = pols[0]->xfrm_nr;
2768
2769#ifdef CONFIG_XFRM_SUB_POLICY
ac1077e9 2770 if (pols[0]->action == XFRM_POLICY_ALLOW &&
80c802f3
TT		 2771 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2772 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
2773 XFRM_POLICY_TYPE_MAIN,
2774 fl, family,
bc56b334
BW		 2775 XFRM_POLICY_OUT,
2776 pols[0]->if_id);
80c802f3
TT		 2777 if (pols[1]) {
2778 if (IS_ERR(pols[1])) {
2779 xfrm_pols_put(pols, *num_pols);
f85daf0e 2780 *num_pols = 0;
80c802f3
TT		 2781 return PTR_ERR(pols[1]);
2782 }
02d0892f 2783 (*num_pols)++;
80c802f3
TT		 2784 (*num_xfrms) += pols[1]->xfrm_nr;
2785 }
2786 }
2787#endif
2788 for (i = 0; i < *num_pols; i++) {
2789 if (pols[i]->action != XFRM_POLICY_ALLOW) {
2790 *num_xfrms = -1;
2791 break;
2792 }
2793 }
2794
2795 return 0;
2796
2797}
2798
2799static struct xfrm_dst *
2800xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 2801 const struct flowi *fl, u16 family,
80c802f3
TT		 2802 struct dst_entry *dst_orig)
2803{
2804 struct net *net = xp_net(pols[0]);
2805 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
5492093d 2806 struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
e4db5b61 2807 struct xfrm_dst *xdst;
80c802f3 2808 struct dst_entry *dst;
80c802f3
TT		 2809 int err;
2810
cf379667
FW		 2811 /* Try to instantiate a bundle */
2812 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
2813 if (err <= 0) {
934ffce1
Y		 2814 if (err == 0)
2815 return NULL;
2816
2817 if (err != -EAGAIN)
cf379667
FW		 2818 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2819 return ERR_PTR(err);
2820 }
2821
5492093d 2822 dst = xfrm_bundle_create(pols[0], xfrm, bundle, err, fl, dst_orig);
80c802f3
TT		 2823 if (IS_ERR(dst)) {
2824 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
2825 return ERR_CAST(dst);
2826 }
2827
2828 xdst = (struct xfrm_dst *)dst;
2829 xdst->num_xfrms = err;
80c802f3 2830 xdst->num_pols = num_pols;
3e94c2dc 2831 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2832 xdst->policy_genid = atomic_read(&pols[0]->genid);
2833
2834 return xdst;
2835}
2836
c3aed709 2837static void xfrm_policy_queue_process(struct timer_list *t)
a0073fe1 2838{
a0073fe1
SK		 2839 struct sk_buff *skb;
2840 struct sock *sk;
2841 struct dst_entry *dst;
c3aed709 2842 struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer);
3f5312ae 2843 struct net *net = xp_net(pol);
a0073fe1
SK		 2844 struct xfrm_policy_queue *pq = &pol->polq;
2845 struct flowi fl;
2846 struct sk_buff_head list;
b328ecc4 2847 __u32 skb_mark;
a0073fe1
SK		 2848
2849 spin_lock(&pq->hold_queue.lock);
2850 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 2851 if (!skb) {
2852 spin_unlock(&pq->hold_queue.lock);
2853 goto out;
2854 }
a0073fe1
SK		 2855 dst = skb_dst(skb);
2856 sk = skb->sk;
b328ecc4
SK		 2857
2858 /* Fixup the mark to support VTI. */
2859 skb_mark = skb->mark;
2860 skb->mark = pol->mark.v;
a0073fe1 2861 xfrm_decode_session(skb, &fl, dst->ops->family);
b328ecc4 2862 skb->mark = skb_mark;
a0073fe1
SK		 2863 spin_unlock(&pq->hold_queue.lock);
2864
0f6c480f 2865 dst_hold(xfrm_dst_path(dst));
2471c981 2866 dst = xfrm_lookup(net, xfrm_dst_path(dst), &fl, sk, XFRM_LOOKUP_QUEUE);
a0073fe1
SK		 2867 if (IS_ERR(dst))
2868 goto purge_queue;
2869
2870 if (dst->flags & DST_XFRM_QUEUE) {
2871 dst_release(dst);
2872
2873 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
2874 goto purge_queue;
2875
2876 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 2877 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
2878 xfrm_pol_hold(pol);
7759d6a8 2879 goto out;
a0073fe1
SK		 2880 }
2881
2882 dst_release(dst);
2883
2884 __skb_queue_head_init(&list);
2885
2886 spin_lock(&pq->hold_queue.lock);
2887 pq->timeout = 0;
2888 skb_queue_splice_init(&pq->hold_queue, &list);
2889 spin_unlock(&pq->hold_queue.lock);
2890
2891 while (!skb_queue_empty(&list)) {
2892 skb = __skb_dequeue(&list);
2893
b328ecc4
SK		 2894 /* Fixup the mark to support VTI. */
2895 skb_mark = skb->mark;
2896 skb->mark = pol->mark.v;
a0073fe1 2897 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
b328ecc4
SK		 2898 skb->mark = skb_mark;
2899
0f6c480f
DM		 2900 dst_hold(xfrm_dst_path(skb_dst(skb)));
2901 dst = xfrm_lookup(net, xfrm_dst_path(skb_dst(skb)), &fl, skb->sk, 0);
a0073fe1 2902 if (IS_ERR(dst)) {
a0073fe1
SK		 2903 kfree_skb(skb);
2904 continue;
2905 }
2906
895b5c9f 2907 nf_reset_ct(skb);
a0073fe1
SK		 2908 skb_dst_drop(skb);
2909 skb_dst_set(skb, dst);
2910
13206b6b 2911 dst_output(net, skb->sk, skb);
a0073fe1
SK		 2912 }
2913
e7d8f6cb
SK		 2914out:
2915 xfrm_pol_put(pol);
a0073fe1
SK		 2916 return;
2917
2918purge_queue:
2919 pq->timeout = 0;
1ee5e667 2920 skb_queue_purge(&pq->hold_queue);
e7d8f6cb 2921 xfrm_pol_put(pol);
a0073fe1
SK		 2922}
2923
ede2059d 2924static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
a0073fe1
SK		 2925{
2926 unsigned long sched_next;
2927 struct dst_entry *dst = skb_dst(skb);
2928 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 2929 struct xfrm_policy *pol = xdst->pols[0];
2930 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4 2931
39bb5e62 2932 if (unlikely(skb_fclone_busy(sk, skb))) {
4d53eff4
SK		 2933 kfree_skb(skb);
2934 return 0;
2935 }
a0073fe1
SK		 2936
2937 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
2938 kfree_skb(skb);
2939 return -EAGAIN;
2940 }
2941
2942 skb_dst_force(skb);
a0073fe1
SK		 2943
2944 spin_lock_bh(&pq->hold_queue.lock);
2945
2946 if (!pq->timeout)
2947 pq->timeout = XFRM_QUEUE_TMO_MIN;
2948
2949 sched_next = jiffies + pq->timeout;
2950
2951 if (del_timer(&pq->hold_timer)) {
2952 if (time_before(pq->hold_timer.expires, sched_next))
2953 sched_next = pq->hold_timer.expires;
e7d8f6cb 2954 xfrm_pol_put(pol);
a0073fe1
SK		 2955 }
2956
2957 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 2958 if (!mod_timer(&pq->hold_timer, sched_next))
2959 xfrm_pol_hold(pol);
a0073fe1
SK		 2960
2961 spin_unlock_bh(&pq->hold_queue.lock);
2962
2963 return 0;
2964}
2965
2966static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
b8c203b2 2967 struct xfrm_flo *xflo,
a0073fe1
SK		 2968 const struct flowi *fl,
2969 int num_xfrms,
2970 u16 family)
2971{
2972 int err;
2973 struct net_device *dev;
b8c203b2 2974 struct dst_entry *dst;
a0073fe1
SK		 2975 struct dst_entry *dst1;
2976 struct xfrm_dst *xdst;
2977
2978 xdst = xfrm_alloc_dst(net, family);
2979 if (IS_ERR(xdst))
2980 return xdst;
2981
b8c203b2
SK		 2982 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2983 net->xfrm.sysctl_larval_drop ||
2984 num_xfrms <= 0)
a0073fe1
SK		 2985 return xdst;
2986
b8c203b2 2987 dst = xflo->dst_orig;
a0073fe1
SK		 2988 dst1 = &xdst->u.dst;
2989 dst_hold(dst);
2990 xdst->route = dst;
2991
2992 dst_copy_metrics(dst1, dst);
2993
2994 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
af13b3c3 2995 dst1->flags |= DST_XFRM_QUEUE;
a0073fe1
SK		 2996 dst1->lastuse = jiffies;
2997
2998 dst1->input = dst_discard;
2999 dst1->output = xdst_queue_output;
3000
3001 dst_hold(dst);
45b018be 3002 xfrm_dst_set_child(xdst, dst);
0f6c480f 3003 xdst->path = dst;
a0073fe1
SK		 3004
3005 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
3006
3007 err = -ENODEV;
3008 dev = dst->dev;
3009 if (!dev)
3010 goto free_dst;
3011
3012 err = xfrm_fill_dst(xdst, dev, fl);
3013 if (err)
3014 goto free_dst;
3015
3016out:
3017 return xdst;
3018
3019free_dst:
3020 dst_release(dst1);
3021 xdst = ERR_PTR(err);
3022 goto out;
3023}
3024
bc56b334
BW		 3025static struct xfrm_dst *xfrm_bundle_lookup(struct net *net,
3026 const struct flowi *fl,
3027 u16 family, u8 dir,
3028 struct xfrm_flo *xflo, u32 if_id)
80c802f3 3029{
80c802f3 3030 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
855dad99 3031 int num_pols = 0, num_xfrms = 0, err;
bd45c539 3032 struct xfrm_dst *xdst;
80c802f3 3033
80c802f3
TT		 3034 /* Resolve policies to use if we couldn't get them from
3035 * previous cache entry */
855dad99 3036 num_pols = 1;
bc56b334 3037 pols[0] = xfrm_policy_lookup(net, fl, family, dir, if_id);
855dad99 3038 err = xfrm_expand_policies(fl, family, pols,
80c802f3 3039 &num_pols, &num_xfrms);
855dad99
FW		 3040 if (err < 0)
3041 goto inc_error;
3042 if (num_pols == 0)
3043 return NULL;
3044 if (num_xfrms <= 0)
3045 goto make_dummy_bundle;
80c802f3 3046
bd45c539 3047 xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
76a42011 3048 xflo->dst_orig);
bd45c539
FW		 3049 if (IS_ERR(xdst)) {
3050 err = PTR_ERR(xdst);
f203b76d
SK		 3051 if (err == -EREMOTE) {
3052 xfrm_pols_put(pols, num_pols);
3053 return NULL;
3054 }
3055
80c802f3
TT		 3056 if (err != -EAGAIN)
3057 goto error;
855dad99 3058 goto make_dummy_bundle;
bd45c539 3059 } else if (xdst == NULL) {
d809ec89 3060 num_xfrms = 0;
855dad99 3061 goto make_dummy_bundle;
80c802f3
TT		 3062 }
3063
bd45c539 3064 return xdst;
80c802f3
TT		 3065
3066make_dummy_bundle:
3067 /* We found policies, but there's no bundles to instantiate:
3068 * either because the policy blocks, has no transformations or
3069 * we could not build template (no xfrm_states).*/
b8c203b2 3070 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
80c802f3
TT		 3071 if (IS_ERR(xdst)) {
3072 xfrm_pols_put(pols, num_pols);
3073 return ERR_CAST(xdst);
3074 }
3075 xdst->num_pols = num_pols;
3076 xdst->num_xfrms = num_xfrms;
3e94c2dc 3077 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3 3078
bd45c539 3079 return xdst;
80c802f3
TT		 3080
3081inc_error:
3082 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
3083error:
855dad99 3084 xfrm_pols_put(pols, num_pols);
80c802f3
TT		 3085 return ERR_PTR(err);
3086}
1da177e4 3087
2774c131
DM		 3088static struct dst_entry *make_blackhole(struct net *net, u16 family,
3089 struct dst_entry *dst_orig)
3090{
37b10383 3091 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2774c131
DM		 3092 struct dst_entry *ret;
3093
3094 if (!afinfo) {
3095 dst_release(dst_orig);
433a1954 3096 return ERR_PTR(-EINVAL);
2774c131
DM		 3097 } else {
3098 ret = afinfo->blackhole_route(net, dst_orig);
3099 }
bdba9fe0 3100 rcu_read_unlock();
2774c131
DM		 3101
3102 return ret;
3103}
3104
bc56b334 3105/* Finds/creates a bundle for given flow and if_id
1da177e4
LT		 3106 *
3107 * At the moment we eat a raw IP route. Mostly to speed up lookups
3108 * on interfaces with disabled IPsec.
bc56b334
BW		 3109 *
3110 * xfrm_lookup uses an if_id of 0 by default, and is provided for
3111 * compatibility
1da177e4 3112 */
bc56b334
BW		 3113struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
3114 struct dst_entry *dst_orig,
3115 const struct flowi *fl,
3116 const struct sock *sk,
3117 int flags, u32 if_id)
1da177e4 3118{
4e81bb83 3119 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3 3120 struct xfrm_dst *xdst;
452edd59 3121 struct dst_entry *dst, *route;
80c802f3 3122 u16 family = dst_orig->ops->family;
aff669bc 3123 u8 dir = XFRM_POLICY_OUT;
4b021628 3124 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 3125
80c802f3
TT		 3126 dst = NULL;
3127 xdst = NULL;
3128 route = NULL;
4e81bb83 3129
bd5eb35f 3130 sk = sk_const_to_full_sk(sk);
f7944fb1 3131 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3 3132 num_pols = 1;
bc56b334
BW		 3133 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family,
3134 if_id);
80c802f3
TT		 3135 err = xfrm_expand_policies(fl, family, pols,
3136 &num_pols, &num_xfrms);
3137 if (err < 0)
75b8c133 3138 goto dropdst;
80c802f3
TT		 3139
3140 if (num_pols) {
3141 if (num_xfrms <= 0) {
3142 drop_pols = num_pols;
3143 goto no_transform;
3144 }
3145
3146 xdst = xfrm_resolve_and_create_bundle(
3147 pols, num_pols, fl,
3148 family, dst_orig);
76a42011 3149
80c802f3
TT		 3150 if (IS_ERR(xdst)) {
3151 xfrm_pols_put(pols, num_pols);
3152 err = PTR_ERR(xdst);
f203b76d
SK		 3153 if (err == -EREMOTE)
3154 goto nopol;
3155
80c802f3 3156 goto dropdst;
d809ec89
TT		 3157 } else if (xdst == NULL) {
3158 num_xfrms = 0;
3159 drop_pols = num_pols;
3160 goto no_transform;
80c802f3
TT		 3161 }
3162
80c802f3 3163 route = xdst->route;
0aa64774 3164 }
3bccfbc7 3165 }
1da177e4 3166
80c802f3 3167 if (xdst == NULL) {
b8c203b2
SK		 3168 struct xfrm_flo xflo;
3169
3170 xflo.dst_orig = dst_orig;
3171 xflo.flags = flags;
3172
1da177e4 3173 /* To accelerate a bit... */
9f8550e4
EB		 3174 if (!if_id && ((dst_orig->flags & DST_NOXFRM) ||
3175 !net->xfrm.policy_count[XFRM_POLICY_OUT]))
8b7817f3 3176 goto nopol;
1da177e4 3177
bc56b334 3178 xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo, if_id);
bd45c539 3179 if (xdst == NULL)
80c802f3 3180 goto nopol;
bd45c539
FW		 3181 if (IS_ERR(xdst)) {
3182 err = PTR_ERR(xdst);
75b8c133 3183 goto dropdst;
d66e37a9 3184 }
80c802f3
TT		 3185
3186 num_pols = xdst->num_pols;
3187 num_xfrms = xdst->num_xfrms;
3e94c2dc 3188 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 3189 route = xdst->route;
3190 }
3191
3192 dst = &xdst->u.dst;
3193 if (route == NULL && num_xfrms > 0) {
3194 /* The only case when xfrm_bundle_lookup() returns a
3195 * bundle with null route, is when the template could
3196 * not be resolved. It means policies are there, but
3197 * bundle could not be created, since we don't yet
3198 * have the xfrm_state's. We need to wait for KM to
3199 * negotiate new SA's or bail out with error.*/
3200 if (net->xfrm.sysctl_larval_drop) {
80c802f3 3201 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
ac37e251
W		 3202 err = -EREMOTE;
3203 goto error;
80c802f3 3204 }
80c802f3 3205
5b8ef341 3206 err = -EAGAIN;
80c802f3
TT		 3207
3208 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
3209 goto error;
1da177e4
LT		 3210 }
3211
80c802f3
TT		 3212no_transform:
3213 if (num_pols == 0)
8b7817f3 3214 goto nopol;
1da177e4 3215
80c802f3
TT		 3216 if ((flags & XFRM_LOOKUP_ICMP) &&
3217 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
3218 err = -ENOENT;
8b7817f3 3219 goto error;
80c802f3 3220 }
8b7817f3 3221
80c802f3 3222 for (i = 0; i < num_pols; i++)
de5724ca 3223 WRITE_ONCE(pols[i]->curlft.use_time, ktime_get_real_seconds());
8b7817f3 3224
80c802f3 3225 if (num_xfrms < 0) {
1da177e4 3226 /* Prohibit the flow */
59c9940e 3227 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 3228 err = -EPERM;
3229 goto error;
80c802f3
TT		 3230 } else if (num_xfrms > 0) {
3231 /* Flow transformed */
80c802f3
TT		 3232 dst_release(dst_orig);
3233 } else {
3234 /* Flow passes untransformed */
3235 dst_release(dst);
452edd59 3236 dst = dst_orig;
1da177e4 3237 }
80c802f3
TT		 3238ok:
3239 xfrm_pols_put(pols, drop_pols);
0c183379
G		 3240 if (dst && dst->xfrm &&
3241 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
3242 dst->flags |= DST_XFRM_TUNNEL;
452edd59 3243 return dst;
1da177e4 3244
80c802f3 3245nopol:
17ecd4a4 3246 if ((!dst_orig->dev || !(dst_orig->dev->flags & IFF_LOOPBACK)) &&
b58b1f56 3247 net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) {
2d151d39
SK		 3248 err = -EPERM;
3249 goto error;
3250 }
452edd59
DM		 3251 if (!(flags & XFRM_LOOKUP_ICMP)) {
3252 dst = dst_orig;
80c802f3 3253 goto ok;
452edd59 3254 }
80c802f3 3255 err = -ENOENT;
1da177e4 3256error:
80c802f3 3257 dst_release(dst);
75b8c133 3258dropdst:
ac37e251
W		 3259 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
3260 dst_release(dst_orig);
80c802f3 3261 xfrm_pols_put(pols, drop_pols);
452edd59 3262 return ERR_PTR(err);
1da177e4 3263}
bc56b334
BW		 3264EXPORT_SYMBOL(xfrm_lookup_with_ifid);
3265
3266/* Main function: finds/creates a bundle for given flow.
3267 *
3268 * At the moment we eat a raw IP route. Mostly to speed up lookups
3269 * on interfaces with disabled IPsec.
3270 */
3271struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
3272 const struct flowi *fl, const struct sock *sk,
3273 int flags)
3274{
3275 return xfrm_lookup_with_ifid(net, dst_orig, fl, sk, flags, 0);
3276}
1da177e4
LT		 3277EXPORT_SYMBOL(xfrm_lookup);
3278
f92ee619
SK		 3279/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
3280 * Otherwise we may send out blackholed packets.
3281 */
3282struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
3283 const struct flowi *fl,
6f9c9615 3284 const struct sock *sk, int flags)
f92ee619 3285{
b8c203b2 3286 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
ac37e251
W		 3287 flags | XFRM_LOOKUP_QUEUE |
3288 XFRM_LOOKUP_KEEP_DST_REF);
f92ee619 3289
45586c70 3290 if (PTR_ERR(dst) == -EREMOTE)
f92ee619
SK		 3291 return make_blackhole(net, dst_orig->ops->family, dst_orig);
3292
8cc88773
TR		 3293 if (IS_ERR(dst))
3294 dst_release(dst_orig);
3295
f92ee619
SK		 3296 return dst;
3297}
3298EXPORT_SYMBOL(xfrm_lookup_route);
3299
df0ba92a 3300static inline int
8f029de2 3301xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a 3302{
2294be0f 3303 struct sec_path *sp = skb_sec_path(skb);
df0ba92a 3304 struct xfrm_state *x;
df0ba92a 3305
2294be0f 3306 if (!sp || idx < 0 || idx >= sp->len)
df0ba92a 3307 return 0;
2294be0f 3308 x = sp->xvec[idx];
df0ba92a
MN		 3309 if (!x->type->reject)
3310 return 0;
1ecafede 3311 return x->type->reject(x, skb, fl);
df0ba92a
MN		 3312}
3313
1da177e4
LT		 3314/* When skb is transformed back to its "native" form, we have to
3315 * check policy restrictions. At the moment we make this in maximally
3316 * stupid way. Shame on me. :-) Of course, connected sockets must
3317 * have policy cached at them.
3318 */
3319
3320static inline int
7db454b9 3321xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
8680407b 3322 unsigned short family, u32 if_id)
1da177e4
LT		 3323{
3324 if (xfrm_state_kern(x))
928ba416 3325 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 3326 return x->id.proto == tmpl->id.proto &&
3327 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
3328 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
3329 x->props.mode == tmpl->mode &&
c5d18e98 3330 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 3331 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de 3332 !(x->props.mode != XFRM_MODE_TRANSPORT &&
8680407b
BW		 3333 xfrm_state_addr_cmp(tmpl, x, family)) &&
3334 (if_id == 0 || if_id == x->if_id);
1da177e4
LT		 3335}
3336
df0ba92a
MN		 3337/*
3338 * 0 or more than 0 is returned when validation is succeeded (either bypass
7a7ae1eb 3339 * because of optional transport mode, or next index of the matched secpath
df0ba92a
MN		 3340 * state with the template.
3341 * -1 is returned when no matching template is found.
3342 * Otherwise "-2 - errored_index" is returned.
3343 */
1da177e4 3344static inline int
22cccb7e 3345xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
8680407b 3346 unsigned short family, u32 if_id)
1da177e4
LT		 3347{
3348 int idx = start;
3349
3350 if (tmpl->optional) {
7e49e6de 3351 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 3352 return start;
3353 } else
3354 start = -1;
3355 for (; idx < sp->len; idx++) {
8680407b 3356 if (xfrm_state_ok(tmpl, sp->xvec[idx], family, if_id))
1da177e4 3357 return ++idx;
df0ba92a 3358 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1f8b6df6
BW		 3359 if (idx < sp->verified_cnt) {
3360 /* Secpath entry previously verified, consider optional and
3361 * continue searching
3362 */
3363 continue;
3364 }
3365
df0ba92a
MN		 3366 if (start == -1)
3367 start = -2-idx;
1da177e4 3368 break;
df0ba92a 3369 }
1da177e4
LT		 3370 }
3371 return start;
3372}
3373
c53ac41e
FW		 3374static void
3375decode_session4(struct sk_buff *skb, struct flowi *fl, bool reverse)
3376{
3377 const struct iphdr *iph = ip_hdr(skb);
858e5400
FW		 3378 int ihl = iph->ihl;
3379 u8 *xprth = skb_network_header(skb) + ihl * 4;
c53ac41e
FW		 3380 struct flowi4 *fl4 = &fl->u.ip4;
3381 int oif = 0;
3382
c3b4c3a4 3383 if (skb_dst(skb) && skb_dst(skb)->dev)
c53ac41e
FW		 3384 oif = skb_dst(skb)->dev->ifindex;
3385
3386 memset(fl4, 0, sizeof(struct flowi4));
3387 fl4->flowi4_mark = skb->mark;
3388 fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
3389
858e5400
FW		 3390 fl4->flowi4_proto = iph->protocol;
3391 fl4->daddr = reverse ? iph->saddr : iph->daddr;
3392 fl4->saddr = reverse ? iph->daddr : iph->saddr;
23e7b1bf 3393 fl4->flowi4_tos = iph->tos & ~INET_ECN_MASK;
858e5400 3394
c53ac41e
FW		 3395 if (!ip_is_fragment(iph)) {
3396 switch (iph->protocol) {
3397 case IPPROTO_UDP:
3398 case IPPROTO_UDPLITE:
3399 case IPPROTO_TCP:
3400 case IPPROTO_SCTP:
3401 case IPPROTO_DCCP:
3402 if (xprth + 4 < skb->data ||
3403 pskb_may_pull(skb, xprth + 4 - skb->data)) {
3404 __be16 *ports;
3405
858e5400 3406 xprth = skb_network_header(skb) + ihl * 4;
c53ac41e
FW		 3407 ports = (__be16 *)xprth;
3408
3409 fl4->fl4_sport = ports[!!reverse];
3410 fl4->fl4_dport = ports[!reverse];
3411 }
3412 break;
3413 case IPPROTO_ICMP:
3414 if (xprth + 2 < skb->data ||
3415 pskb_may_pull(skb, xprth + 2 - skb->data)) {
3416 u8 *icmp;
3417
858e5400 3418 xprth = skb_network_header(skb) + ihl * 4;
c53ac41e
FW		 3419 icmp = xprth;
3420
3421 fl4->fl4_icmp_type = icmp[0];
3422 fl4->fl4_icmp_code = icmp[1];
3423 }
3424 break;
c53ac41e
FW		 3425 case IPPROTO_GRE:
3426 if (xprth + 12 < skb->data ||
3427 pskb_may_pull(skb, xprth + 12 - skb->data)) {
3428 __be16 *greflags;
3429 __be32 *gre_hdr;
3430
858e5400 3431 xprth = skb_network_header(skb) + ihl * 4;
c53ac41e
FW		 3432 greflags = (__be16 *)xprth;
3433 gre_hdr = (__be32 *)xprth;
3434
3435 if (greflags[0] & GRE_KEY) {
3436 if (greflags[0] & GRE_CSUM)
3437 gre_hdr++;
3438 fl4->fl4_gre_key = gre_hdr[1];
3439 }
3440 }
3441 break;
3442 default:
c53ac41e
FW		 3443 break;
3444 }
3445 }
c53ac41e
FW		 3446}
3447
3448#if IS_ENABLED(CONFIG_IPV6)
3449static void
3450decode_session6(struct sk_buff *skb, struct flowi *fl, bool reverse)
3451{
3452 struct flowi6 *fl6 = &fl->u.ip6;
3453 int onlyproto = 0;
3454 const struct ipv6hdr *hdr = ipv6_hdr(skb);
3455 u32 offset = sizeof(*hdr);
3456 struct ipv6_opt_hdr *exthdr;
3457 const unsigned char *nh = skb_network_header(skb);
3458 u16 nhoff = IP6CB(skb)->nhoff;
3459 int oif = 0;
3460 u8 nexthdr;
3461
3462 if (!nhoff)
3463 nhoff = offsetof(struct ipv6hdr, nexthdr);
3464
3465 nexthdr = nh[nhoff];
3466
c3b4c3a4 3467 if (skb_dst(skb) && skb_dst(skb)->dev)
c53ac41e
FW		 3468 oif = skb_dst(skb)->dev->ifindex;
3469
3470 memset(fl6, 0, sizeof(struct flowi6));
3471 fl6->flowi6_mark = skb->mark;
3472 fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
3473
3474 fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
3475 fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
3476
3477 while (nh + offset + sizeof(*exthdr) < skb->data ||
3478 pskb_may_pull(skb, nh + offset + sizeof(*exthdr) - skb->data)) {
3479 nh = skb_network_header(skb);
3480 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
3481
3482 switch (nexthdr) {
3483 case NEXTHDR_FRAGMENT:
3484 onlyproto = 1;
df561f66 3485 fallthrough;
c53ac41e
FW		 3486 case NEXTHDR_ROUTING:
3487 case NEXTHDR_HOP:
3488 case NEXTHDR_DEST:
3489 offset += ipv6_optlen(exthdr);
3490 nexthdr = exthdr->nexthdr;
c53ac41e
FW		 3491 break;
3492 case IPPROTO_UDP:
3493 case IPPROTO_UDPLITE:
3494 case IPPROTO_TCP:
3495 case IPPROTO_SCTP:
3496 case IPPROTO_DCCP:
3497 if (!onlyproto && (nh + offset + 4 < skb->data ||
3498 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
3499 __be16 *ports;
3500
3501 nh = skb_network_header(skb);
3502 ports = (__be16 *)(nh + offset);
3503 fl6->fl6_sport = ports[!!reverse];
3504 fl6->fl6_dport = ports[!reverse];
3505 }
3506 fl6->flowi6_proto = nexthdr;
3507 return;
3508 case IPPROTO_ICMPV6:
3509 if (!onlyproto && (nh + offset + 2 < skb->data ||
3510 pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
3511 u8 *icmp;
3512
3513 nh = skb_network_header(skb);
3514 icmp = (u8 *)(nh + offset);
3515 fl6->fl6_icmp_type = icmp[0];
3516 fl6->fl6_icmp_code = icmp[1];
3517 }
3518 fl6->flowi6_proto = nexthdr;
3519 return;
bcf141b2
GB		 3520 case IPPROTO_GRE:
3521 if (!onlyproto &&
3522 (nh + offset + 12 < skb->data ||
3523 pskb_may_pull(skb, nh + offset + 12 - skb->data))) {
3524 struct gre_base_hdr *gre_hdr;
3525 __be32 *gre_key;
3526
3527 nh = skb_network_header(skb);
3528 gre_hdr = (struct gre_base_hdr *)(nh + offset);
3529 gre_key = (__be32 *)(gre_hdr + 1);
3530
3531 if (gre_hdr->flags & GRE_KEY) {
3532 if (gre_hdr->flags & GRE_CSUM)
3533 gre_key++;
3534 fl6->fl6_gre_key = *gre_key;
3535 }
3536 }
3537 fl6->flowi6_proto = nexthdr;
3538 return;
3539
c53ac41e
FW		 3540#if IS_ENABLED(CONFIG_IPV6_MIP6)
3541 case IPPROTO_MH:
3542 offset += ipv6_optlen(exthdr);
3543 if (!onlyproto && (nh + offset + 3 < skb->data ||
3544 pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
3545 struct ip6_mh *mh;
3546
3547 nh = skb_network_header(skb);
3548 mh = (struct ip6_mh *)(nh + offset);
3549 fl6->fl6_mh_type = mh->ip6mh_type;
3550 }
3551 fl6->flowi6_proto = nexthdr;
3552 return;
3553#endif
c53ac41e 3554 default:
c53ac41e
FW		 3555 fl6->flowi6_proto = nexthdr;
3556 return;
3557 }
3558 }
3559}
3560#endif
3561
d5422efe
HX		 3562int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
3563 unsigned int family, int reverse)
1da177e4 3564{
c53ac41e
FW		 3565 switch (family) {
3566 case AF_INET:
3567 decode_session4(skb, fl, reverse);
3568 break;
3569#if IS_ENABLED(CONFIG_IPV6)
3570 case AF_INET6:
3571 decode_session6(skb, fl, reverse);
3572 break;
3573#endif
3574 default:
1da177e4 3575 return -EAFNOSUPPORT;
c53ac41e 3576 }
1da177e4 3577
c53ac41e 3578 return security_xfrm_decode_session(skb, &fl->flowi_secid);
1da177e4 3579}
d5422efe 3580EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 3581
9a7386ec 3582static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 3583{
3584 for (; k < sp->len; k++) {
df0ba92a 3585 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 3586 *idxp = k;
1da177e4 3587 return 1;
df0ba92a 3588 }
1da177e4
LT		 3589 }
3590
3591 return 0;
3592}
3593
a716c119 3594int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 3595 unsigned short family)
3596{
f6e1e25d 3597 struct net *net = dev_net(skb->dev);
1da177e4 3598 struct xfrm_policy *pol;
4e81bb83
MN		 3599 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
3600 int npols = 0;
3601 int xfrm_nr;
3602 int pi;
d5422efe 3603 int reverse;
1da177e4 3604 struct flowi fl;
df0ba92a 3605 int xerr_idx = -1;
bc56b334 3606 const struct xfrm_if_cb *ifcb;
2294be0f 3607 struct sec_path *sp;
bc56b334
BW		 3608 u32 if_id = 0;
3609
3610 rcu_read_lock();
3611 ifcb = xfrm_if_get_cb();
3612
3613 if (ifcb) {
abc340b3
EB		 3614 struct xfrm_if_decode_session_result r;
3615
3616 if (ifcb->decode_session(skb, family, &r)) {
3617 if_id = r.if_id;
3618 net = r.net;
660899dd 3619 }
bc56b334
BW		 3620 }
3621 rcu_read_unlock();
1da177e4 3622
d5422efe
HX		 3623 reverse = dir & ~XFRM_POLICY_MASK;
3624 dir &= XFRM_POLICY_MASK;
d5422efe 3625
0aa64774 3626 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 3627 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 3628 return 0;
0aa64774
MN		 3629 }
3630
eb9c7ebe 3631 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 3632
3633 /* First, check used SA against their selectors. */
2294be0f
FW		 3634 sp = skb_sec_path(skb);
3635 if (sp) {
1da177e4
LT		 3636 int i;
3637
2294be0f
FW		 3638 for (i = sp->len - 1; i >= 0; i--) {
3639 struct xfrm_state *x = sp->xvec[i];
0aa64774 3640 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 3641 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 3642 return 0;
0aa64774 3643 }
1da177e4
LT		 3644 }
3645 }
3646
3647 pol = NULL;
bd5eb35f 3648 sk = sk_to_full_sk(sk);
3bccfbc7 3649 if (sk && sk->sk_policy[dir]) {
bc56b334 3650 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family, if_id);
0aa64774 3651 if (IS_ERR(pol)) {
59c9940e 3652 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 3653 return 0;
0aa64774 3654 }
3bccfbc7 3655 }
1da177e4 3656
86dc8ee0 3657 if (!pol)
bc56b334 3658 pol = xfrm_policy_lookup(net, &fl, family, dir, if_id);
1da177e4 3659
0aa64774 3660 if (IS_ERR(pol)) {
59c9940e 3661 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 3662 return 0;
0aa64774 3663 }
134b0fc5 3664
df0ba92a 3665 if (!pol) {
b58b1f56 3666 if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) {
2d151d39
SK		 3667 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
3668 return 0;
3669 }
3670
2294be0f 3671 if (sp && secpath_has_nontransport(sp, 0, &xerr_idx)) {
df0ba92a 3672 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 3673 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 3674 return 0;
3675 }
3676 return 1;
3677 }
1da177e4 3678
0a9e5794
ED		 3679 /* This lockless write can happen from different cpus. */
3680 WRITE_ONCE(pol->curlft.use_time, ktime_get_real_seconds());
1da177e4 3681
4e81bb83 3682 pols[0] = pol;
02d0892f 3683 npols++;
4e81bb83
MN		 3684#ifdef CONFIG_XFRM_SUB_POLICY
3685 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 3686 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83 3687 &fl, family,
bc56b334 3688 XFRM_POLICY_IN, if_id);
4e81bb83 3689 if (pols[1]) {
0aa64774 3690 if (IS_ERR(pols[1])) {
59c9940e 3691 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
9c9cb23e 3692 xfrm_pol_put(pols[0]);
134b0fc5 3693 return 0;
0aa64774 3694 }
0a9e5794
ED		 3695 /* This write can happen from different cpus. */
3696 WRITE_ONCE(pols[1]->curlft.use_time,
3697 ktime_get_real_seconds());
02d0892f 3698 npols++;
4e81bb83
MN		 3699 }
3700 }
3701#endif
3702
1da177e4 3703 if (pol->action == XFRM_POLICY_ALLOW) {
1da177e4 3704 static struct sec_path dummy;
4e81bb83 3705 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 3706 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 3707 struct xfrm_tmpl **tpp = tp;
3708 int ti = 0;
1da177e4
LT		 3709 int i, k;
3710
2294be0f
FW		 3711 sp = skb_sec_path(skb);
3712 if (!sp)
1da177e4
LT		 3713 sp = &dummy;
3714
4e81bb83
MN		 3715 for (pi = 0; pi < npols; pi++) {
3716 if (pols[pi] != pol &&
0aa64774 3717 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 3718 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 3719 goto reject;
0aa64774
MN		 3720 }
3721 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 3722 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 3723 goto reject_error;
0aa64774 3724 }
4e81bb83
MN		 3725 for (i = 0; i < pols[pi]->xfrm_nr; i++)
3726 tpp[ti++] = &pols[pi]->xfrm_vec[i];
3727 }
3728 xfrm_nr = ti;
2d151d39 3729
41a49cc3 3730 if (npols > 1) {
3aaf3915 3731 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
41a49cc3
MN		 3732 tpp = stp;
3733 }
4e81bb83 3734
1da177e4
LT		 3735 /* For each tunnel xfrm, find the first matching tmpl.
3736 * For each tmpl before that, find corresponding xfrm.
3737 * Order is _important_. Later we will implement
3738 * some barriers, but at the moment barriers
3739 * are implied between each two transformations.
1f8b6df6
BW		 3740 * Upon success, marks secpath entries as having been
3741 * verified to allow them to be skipped in future policy
3742 * checks (e.g. nested tunnels).
1da177e4 3743 */
4e81bb83 3744 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
8680407b 3745 k = xfrm_policy_ok(tpp[i], sp, k, family, if_id);
df0ba92a 3746 if (k < 0) {
d1d9facf
JM		 3747 if (k < -1)
3748 /* "-2 - errored_index" returned */
3749 xerr_idx = -(2+k);
59c9940e 3750 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 3751 goto reject;
df0ba92a 3752 }
1da177e4
LT		 3753 }
3754
0aa64774 3755 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 3756 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 3757 goto reject;
0aa64774 3758 }
1da177e4 3759
4e81bb83 3760 xfrm_pols_put(pols, npols);
1f8b6df6
BW		 3761 sp->verified_cnt = k;
3762
1da177e4
LT		 3763 return 1;
3764 }
59c9940e 3765 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 3766
3767reject:
df0ba92a 3768 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 3769reject_error:
3770 xfrm_pols_put(pols, npols);
1da177e4
LT		 3771 return 0;
3772}
3773EXPORT_SYMBOL(__xfrm_policy_check);
3774
3775int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
3776{
99a66657 3777 struct net *net = dev_net(skb->dev);
1da177e4 3778 struct flowi fl;
adf30907 3779 struct dst_entry *dst;
73137147 3780 int res = 1;
1da177e4 3781
0aa64774 3782 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 3783 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 3784 return 0;
0aa64774 3785 }
1da177e4 3786
fafeeb6c 3787 skb_dst_force(skb);
9e143793
SK		 3788 if (!skb_dst(skb)) {
3789 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
3790 return 0;
3791 }
adf30907 3792
b8c203b2 3793 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
452edd59 3794 if (IS_ERR(dst)) {
73137147 3795 res = 0;
452edd59
DM		 3796 dst = NULL;
3797 }
adf30907
ED		 3798 skb_dst_set(skb, dst);
3799 return res;
1da177e4
LT		 3800}
3801EXPORT_SYMBOL(__xfrm_route_forward);
3802
d49c73c7
DM		 3803/* Optimize later using cookies and generation ids. */
3804
1da177e4
LT		 3805static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
3806{
d49c73c7 3807 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 3808 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
3809 * get validated by dst_ops->check on every use. We do this
3810 * because when a normal route referenced by an XFRM dst is
3811 * obsoleted we do not go looking around for all parent
3812 * referencing XFRM dsts so that we can invalidate them. It
3813 * is just too much work. Instead we make the checks here on
3814 * every use. For example:
d49c73c7
DM		 3815 *
3816 * XFRM dst A --> IPv4 dst X
3817 *
3818 * X is the "xdst->route" of A (X is also the "dst->path" of A
3819 * in this example). If X is marked obsolete, "A" will not
3820 * notice. That's what we are validating here via the
3821 * stale_bundle() check.
3822 *
52df157f
WW		 3823 * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will
3824 * be marked on it.
09c75704 3825 * This will force stale_bundle() to fail on any xdst bundle with
52df157f 3826 * this dst linked in it.
399c180a 3827 */
d49c73c7
DM		 3828 if (dst->obsolete < 0 && !stale_bundle(dst))
3829 return dst;
3830
1da177e4
LT		 3831 return NULL;
3832}
3833
3834static int stale_bundle(struct dst_entry *dst)
3835{
12fdb4d3 3836 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 3837}
3838
aabc9761 3839void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 3840{
b92cf4aa 3841 while ((dst = xfrm_dst_child(dst)) && dst->xfrm && dst->dev == dev) {
4d33ab08 3842 dst->dev = blackhole_netdev;
de3cb747 3843 dev_hold(dst->dev);
1da177e4
LT		 3844 dev_put(dev);
3845 }
3846}
aabc9761 3847EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 3848
3849static void xfrm_link_failure(struct sk_buff *skb)
3850{
3851 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 3852}
3853
3854static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
3855{
3856 if (dst) {
3857 if (dst->obsolete) {
3858 dst_release(dst);
3859 dst = NULL;
3860 }
3861 }
3862 return dst;
3863}
3864
5492093d 3865static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr)
1da177e4 3866{
5492093d
DM		 3867 while (nr--) {
3868 struct xfrm_dst *xdst = bundle[nr];
1da177e4 3869 u32 pmtu, route_mtu_cached;
5492093d 3870 struct dst_entry *dst;
1da177e4 3871
5492093d 3872 dst = &xdst->u.dst;
b92cf4aa 3873 pmtu = dst_mtu(xfrm_dst_child(dst));
1da177e4
LT		 3874 xdst->child_mtu_cached = pmtu;
3875
3876 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
3877
3878 route_mtu_cached = dst_mtu(xdst->route);
3879 xdst->route_mtu_cached = route_mtu_cached;
3880
3881 if (pmtu > route_mtu_cached)
3882 pmtu = route_mtu_cached;
3883
defb3519 3884 dst_metric_set(dst, RTAX_MTU, pmtu);
5492093d 3885 }
1da177e4
LT		 3886}
3887
1da177e4
LT		 3888/* Check that the bundle accepts the flow and its components are
3889 * still valid.
3890 */
3891
12fdb4d3 3892static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4 3893{
5492093d 3894 struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
1da177e4 3895 struct dst_entry *dst = &first->u.dst;
5492093d
DM		 3896 struct xfrm_dst *xdst;
3897 int start_from, nr;
1da177e4
LT		 3898 u32 mtu;
3899
0f6c480f 3900 if (!dst_check(xfrm_dst_path(dst), ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 3901 (dst->dev && !netif_running(dst->dev)))
3902 return 0;
3903
a0073fe1
SK		 3904 if (dst->flags & DST_XFRM_QUEUE)
3905 return 1;
3906
5492093d 3907 start_from = nr = 0;
1da177e4
LT		 3908 do {
3909 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
3910
1da177e4
LT		 3911 if (dst->xfrm->km.state != XFRM_STATE_VALID)
3912 return 0;
80c802f3
TT		 3913 if (xdst->xfrm_genid != dst->xfrm->genid)
3914 return 0;
b1312c89
TT		 3915 if (xdst->num_pols > 0 &&
3916 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 3917 return 0;
e53820de 3918
5492093d
DM		 3919 bundle[nr++] = xdst;
3920
b92cf4aa 3921 mtu = dst_mtu(xfrm_dst_child(dst));
1da177e4 3922 if (xdst->child_mtu_cached != mtu) {
5492093d 3923 start_from = nr;
1da177e4
LT		 3924 xdst->child_mtu_cached = mtu;
3925 }
3926
92d63dec 3927 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 3928 return 0;
3929 mtu = dst_mtu(xdst->route);
3930 if (xdst->route_mtu_cached != mtu) {
5492093d 3931 start_from = nr;
1da177e4
LT		 3932 xdst->route_mtu_cached = mtu;
3933 }
3934
b92cf4aa 3935 dst = xfrm_dst_child(dst);
1da177e4
LT		 3936 } while (dst->xfrm);
3937
5492093d 3938 if (likely(!start_from))
1da177e4
LT		 3939 return 1;
3940
5492093d
DM		 3941 xdst = bundle[start_from - 1];
3942 mtu = xdst->child_mtu_cached;
3943 while (start_from--) {
3944 dst = &xdst->u.dst;
1da177e4
LT		 3945
3946 mtu = xfrm_state_mtu(dst->xfrm, mtu);
5492093d
DM		 3947 if (mtu > xdst->route_mtu_cached)
3948 mtu = xdst->route_mtu_cached;
defb3519 3949 dst_metric_set(dst, RTAX_MTU, mtu);
5492093d 3950 if (!start_from)
1da177e4
LT		 3951 break;
3952
5492093d
DM		 3953 xdst = bundle[start_from - 1];
3954 xdst->child_mtu_cached = mtu;
1da177e4
LT		 3955 }
3956
3957 return 1;
3958}
3959
0dbaee3b
DM		 3960static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
3961{
0f6c480f 3962 return dst_metric_advmss(xfrm_dst_path(dst));
0dbaee3b
DM		 3963}
3964
ebb762f2 3965static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 3966{
618f9bc7
SK		 3967 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
3968
0f6c480f 3969 return mtu ? : dst_mtu(xfrm_dst_path(dst));
d33e4553
DM		 3970}
3971
1ecc9ad0
JA		 3972static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
3973 const void *daddr)
63fca65d 3974{
0f6c480f 3975 while (dst->xfrm) {
63fca65d
JA		 3976 const struct xfrm_state *xfrm = dst->xfrm;
3977
013cb81e
SK		 3978 dst = xfrm_dst_child(dst);
3979
63fca65d
JA		 3980 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
3981 continue;
3982 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
3983 daddr = xfrm->coaddr;
3984 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
3985 daddr = &xfrm->id.daddr;
3986 }
1ecc9ad0
JA		 3987 return daddr;
3988}
3989
3990static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
3991 struct sk_buff *skb,
3992 const void *daddr)
3993{
0f6c480f 3994 const struct dst_entry *path = xfrm_dst_path(dst);
1ecc9ad0
JA		 3995
3996 if (!skb)
3997 daddr = xfrm_get_dst_nexthop(dst, daddr);
3998 return path->ops->neigh_lookup(path, skb, daddr);
3999}
4000
4001static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
4002{
0f6c480f 4003 const struct dst_entry *path = xfrm_dst_path(dst);
1ecc9ad0
JA		 4004
4005 daddr = xfrm_get_dst_nexthop(dst, daddr);
63fca65d
JA		 4006 path->ops->confirm_neigh(path, daddr);
4007}
4008
a2817d8b 4009int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
1da177e4
LT		 4010{
4011 int err = 0;
a2817d8b
FW		 4012
4013 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
1da177e4 4014 return -EAFNOSUPPORT;
a2817d8b 4015
ef8531b6 4016 spin_lock(&xfrm_policy_afinfo_lock);
a2817d8b 4017 if (unlikely(xfrm_policy_afinfo[family] != NULL))
f31e8d4f 4018 err = -EEXIST;
1da177e4
LT		 4019 else {
4020 struct dst_ops *dst_ops = afinfo->dst_ops;
4021 if (likely(dst_ops->kmem_cachep == NULL))
4022 dst_ops->kmem_cachep = xfrm_dst_cache;
4023 if (likely(dst_ops->check == NULL))
4024 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 4025 if (likely(dst_ops->default_advmss == NULL))
4026 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 4027 if (likely(dst_ops->mtu == NULL))
4028 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 4029 if (likely(dst_ops->negative_advice == NULL))
4030 dst_ops->negative_advice = xfrm_negative_advice;
4031 if (likely(dst_ops->link_failure == NULL))
4032 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 4033 if (likely(dst_ops->neigh_lookup == NULL))
4034 dst_ops->neigh_lookup = xfrm_neigh_lookup;
63fca65d
JA		 4035 if (likely(!dst_ops->confirm_neigh))
4036 dst_ops->confirm_neigh = xfrm_confirm_neigh;
a2817d8b 4037 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
1da177e4 4038 }
ef8531b6 4039 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c 4040
1da177e4
LT		 4041 return err;
4042}
4043EXPORT_SYMBOL(xfrm_policy_register_afinfo);
4044
a2817d8b 4045void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
1da177e4 4046{
2b61997a 4047 struct dst_ops *dst_ops = afinfo->dst_ops;
a2817d8b 4048 int i;
2b61997a 4049
a2817d8b
FW		 4050 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
4051 if (xfrm_policy_afinfo[i] != afinfo)
4052 continue;
4053 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
4054 break;
ef8531b6 4055 }
ef8531b6 4056
2b61997a 4057 synchronize_rcu();
ef8531b6 4058
2b61997a
FW		 4059 dst_ops->kmem_cachep = NULL;
4060 dst_ops->check = NULL;
4061 dst_ops->negative_advice = NULL;
4062 dst_ops->link_failure = NULL;
1da177e4
LT		 4063}
4064EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
4065
f203b76d
SK		 4066void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb)
4067{
4068 spin_lock(&xfrm_if_cb_lock);
4069 rcu_assign_pointer(xfrm_if_cb, ifcb);
4070 spin_unlock(&xfrm_if_cb_lock);
4071}
4072EXPORT_SYMBOL(xfrm_if_register_cb);
4073
4074void xfrm_if_unregister_cb(void)
4075{
4076 RCU_INIT_POINTER(xfrm_if_cb, NULL);
4077 synchronize_rcu();
4078}
4079EXPORT_SYMBOL(xfrm_if_unregister_cb);
4080
558f82ef 4081#ifdef CONFIG_XFRM_STATISTICS
59c9940e 4082static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 4083{
c68cd1a0 4084 int rv;
698365fa
WC		 4085 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
4086 if (!net->mib.xfrm_statistics)
558f82ef 4087 return -ENOMEM;
c68cd1a0
AD		 4088 rv = xfrm_proc_init(net);
4089 if (rv < 0)
698365fa 4090 free_percpu(net->mib.xfrm_statistics);
c68cd1a0 4091 return rv;
558f82ef 4092}
59c9940e
AD		 4093
4094static void xfrm_statistics_fini(struct net *net)
4095{
c68cd1a0 4096 xfrm_proc_fini(net);
698365fa 4097 free_percpu(net->mib.xfrm_statistics);
59c9940e
AD		 4098}
4099#else
4100static int __net_init xfrm_statistics_init(struct net *net)
4101{
4102 return 0;
4103}
4104
4105static void xfrm_statistics_fini(struct net *net)
4106{
4107}
558f82ef
MN		 4108#endif
4109
d62ddc21 4110static int __net_init xfrm_policy_init(struct net *net)
1da177e4 4111{
2518c7c2 4112 unsigned int hmask, sz;
24969fac 4113 int dir, err;
2518c7c2 4114
24969fac 4115 if (net_eq(net, &init_net)) {
d62ddc21 4116 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 4117 sizeof(struct xfrm_dst),
e5d679f3 4118 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 4119 NULL);
24969fac
FW		 4120 err = rhashtable_init(&xfrm_policy_inexact_table,
4121 &xfrm_pol_inexact_params);
4122 BUG_ON(err);
4123 }
1da177e4 4124
2518c7c2
DM		 4125 hmask = 8 - 1;
4126 sz = (hmask+1) * sizeof(struct hlist_head);
4127
93b851c1
AD		 4128 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
4129 if (!net->xfrm.policy_byidx)
4130 goto out_byidx;
8100bea7 4131 net->xfrm.policy_idx_hmask = hmask;
2518c7c2 4132
53c2e285 4133 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM		 4134 struct xfrm_policy_hash *htab;
4135
dc2caba7 4136 net->xfrm.policy_count[dir] = 0;
53c2e285 4137 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
8b18f8ea 4138 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 4139
a35f6c5d 4140 htab = &net->xfrm.policy_bydst[dir];
44e36b42 4141 htab->table = xfrm_hash_alloc(sz);
2518c7c2 4142 if (!htab->table)
a35f6c5d
AD		 4143 goto out_bydst;
4144 htab->hmask = hmask;
b58555f1
CG		 4145 htab->dbits4 = 32;
4146 htab->sbits4 = 32;
4147 htab->dbits6 = 128;
4148 htab->sbits6 = 128;
2518c7c2 4149 }
880a6fab
CG		 4150 net->xfrm.policy_hthresh.lbits4 = 32;
4151 net->xfrm.policy_hthresh.rbits4 = 32;
4152 net->xfrm.policy_hthresh.lbits6 = 128;
4153 net->xfrm.policy_hthresh.rbits6 = 128;
4154
4155 seqlock_init(&net->xfrm.policy_hthresh.lock);
2518c7c2 4156
adfcf0b2 4157 INIT_LIST_HEAD(&net->xfrm.policy_all);
24969fac 4158 INIT_LIST_HEAD(&net->xfrm.inexact_bins);
66caf628 4159 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
880a6fab 4160 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
d62ddc21 4161 return 0;
93b851c1 4162
a35f6c5d
AD		 4163out_bydst:
4164 for (dir--; dir >= 0; dir--) {
4165 struct xfrm_policy_hash *htab;
4166
4167 htab = &net->xfrm.policy_bydst[dir];
4168 xfrm_hash_free(htab->table, sz);
4169 }
4170 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 4171out_byidx:
4172 return -ENOMEM;
d62ddc21
AD		 4173}
4174
4175static void xfrm_policy_fini(struct net *net)
4176{
6be3b0db 4177 struct xfrm_pol_inexact_bin *b, *t;
93b851c1 4178 unsigned int sz;
8b18f8ea 4179 int dir;
93b851c1 4180
7c2776ee
AD		 4181 flush_work(&net->xfrm.policy_hash_work);
4182#ifdef CONFIG_XFRM_SUB_POLICY
2e71029e 4183 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
7c2776ee 4184#endif
2e71029e 4185 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
7c2776ee 4186
adfcf0b2 4187 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 4188
53c2e285 4189 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
a35f6c5d
AD		 4190 struct xfrm_policy_hash *htab;
4191
8b18f8ea 4192 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 4193
4194 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 4195 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 4196 WARN_ON(!hlist_empty(htab->table));
4197 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 4198 }
4199
8100bea7 4200 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 4201 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
4202 xfrm_hash_free(net->xfrm.policy_byidx, sz);
24969fac 4203
6be3b0db
FW		 4204 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
4205 list_for_each_entry_safe(b, t, &net->xfrm.inexact_bins, inexact_bins)
4206 __xfrm_policy_inexact_prune_bin(b, true);
4207 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 4208}
4209
d62ddc21
AD		 4210static int __net_init xfrm_net_init(struct net *net)
4211{
4212 int rv;
4213
c282222a
FW		 4214 /* Initialize the per-net locks here */
4215 spin_lock_init(&net->xfrm.xfrm_state_lock);
4216 spin_lock_init(&net->xfrm.xfrm_policy_lock);
2580d3f4 4217 seqcount_spinlock_init(&net->xfrm.xfrm_policy_hash_generation, &net->xfrm.xfrm_policy_lock);
c282222a 4218 mutex_init(&net->xfrm.xfrm_cfg_mutex);
b58b1f56
ND		 4219 net->xfrm.policy_default[XFRM_POLICY_IN] = XFRM_USERPOLICY_ACCEPT;
4220 net->xfrm.policy_default[XFRM_POLICY_FWD] = XFRM_USERPOLICY_ACCEPT;
4221 net->xfrm.policy_default[XFRM_POLICY_OUT] = XFRM_USERPOLICY_ACCEPT;
c282222a 4222
59c9940e
AD		 4223 rv = xfrm_statistics_init(net);
4224 if (rv < 0)
4225 goto out_statistics;
d62ddc21
AD		 4226 rv = xfrm_state_init(net);
4227 if (rv < 0)
4228 goto out_state;
4229 rv = xfrm_policy_init(net);
4230 if (rv < 0)
4231 goto out_policy;
b27aeadb
AD		 4232 rv = xfrm_sysctl_init(net);
4233 if (rv < 0)
4234 goto out_sysctl;
283bc9f3 4235
d62ddc21
AD		 4236 return 0;
4237
b27aeadb
AD		 4238out_sysctl:
4239 xfrm_policy_fini(net);
d62ddc21
AD		 4240out_policy:
4241 xfrm_state_fini(net);
4242out_state:
59c9940e
AD		 4243 xfrm_statistics_fini(net);
4244out_statistics:
d62ddc21
AD		 4245 return rv;
4246}
4247
4248static void __net_exit xfrm_net_exit(struct net *net)
4249{
b27aeadb 4250 xfrm_sysctl_fini(net);
d62ddc21
AD		 4251 xfrm_policy_fini(net);
4252 xfrm_state_fini(net);
59c9940e 4253 xfrm_statistics_fini(net);
d62ddc21
AD		 4254}
4255
4256static struct pernet_operations __net_initdata xfrm_net_ops = {
4257 .init = xfrm_net_init,
4258 .exit = xfrm_net_exit,
4259};
4260
1da177e4
LT		 4261void __init xfrm_init(void)
4262{
d62ddc21 4263 register_pernet_subsys(&xfrm_net_ops);
e9a441b6 4264 xfrm_dev_init();
1da177e4 4265 xfrm_input_init();
f203b76d 4266
95a35b42 4267#ifdef CONFIG_XFRM_ESPINTCP
e27cca96
SD		 4268 espintcp_init();
4269#endif
1da177e4
LT		 4270}
4271
ab5f5e8b 4272#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 4273static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
4274 struct audit_buffer *audit_buf)
ab5f5e8b 4275{
875179fa
PM		 4276 struct xfrm_sec_ctx *ctx = xp->security;
4277 struct xfrm_selector *sel = &xp->selector;
4278
4279 if (ctx)
ab5f5e8b 4280 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 4281 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 4282
9b7a787d 4283 switch (sel->family) {
ab5f5e8b 4284 case AF_INET:
21454aaa 4285 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 4286 if (sel->prefixlen_s != 32)
4287 audit_log_format(audit_buf, " src_prefixlen=%d",
4288 sel->prefixlen_s);
21454aaa 4289 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 4290 if (sel->prefixlen_d != 32)
4291 audit_log_format(audit_buf, " dst_prefixlen=%d",
4292 sel->prefixlen_d);
ab5f5e8b
JL		 4293 break;
4294 case AF_INET6:
5b095d98 4295 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 4296 if (sel->prefixlen_s != 128)
4297 audit_log_format(audit_buf, " src_prefixlen=%d",
4298 sel->prefixlen_s);
5b095d98 4299 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 4300 if (sel->prefixlen_d != 128)
4301 audit_log_format(audit_buf, " dst_prefixlen=%d",
4302 sel->prefixlen_d);
ab5f5e8b
JL		 4303 break;
4304 }
4305}
4306
2e71029e 4307void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
ab5f5e8b
JL		 4308{
4309 struct audit_buffer *audit_buf;
ab5f5e8b 4310
afeb14b4 4311 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 4312 if (audit_buf == NULL)
4313 return;
2e71029e 4314 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 4315 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 4316 xfrm_audit_common_policyinfo(xp, audit_buf);
4317 audit_log_end(audit_buf);
4318}
4319EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
4320
68277acc 4321void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2e71029e 4322 bool task_valid)
ab5f5e8b
JL		 4323{
4324 struct audit_buffer *audit_buf;
ab5f5e8b 4325
afeb14b4 4326 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 4327 if (audit_buf == NULL)
4328 return;
2e71029e 4329 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4 4330 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 4331 xfrm_audit_common_policyinfo(xp, audit_buf);
4332 audit_log_end(audit_buf);
4333}
4334EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
4335#endif
4336
80c9abaa 4337#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 4338static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
4339 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 4340{
4341 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
4342 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 4343 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
4344 sel_cmp->family) &&
4345 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
4346 sel_cmp->family) &&
80c9abaa
SS		 4347 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
4348 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 4349 return true;
80c9abaa
SS		 4350 }
4351 } else {
4352 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 4353 return true;
80c9abaa
SS		 4354 }
4355 }
bc9b35ad 4356 return false;
80c9abaa
SS		 4357}
4358
3e94c2dc 4359static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
c1aca308 4360 u8 dir, u8 type, struct net *net, u32 if_id)
80c9abaa
SS		 4361{
4362 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 4363 struct hlist_head *chain;
4364 u32 priority = ~0U;
4365
9d0380df 4366 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
8d549c4f 4367 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 4368 hlist_for_each_entry(pol, chain, bydst) {
c1aca308
YY		 4369 if ((if_id == 0 || pol->if_id == if_id) &&
4370 xfrm_migrate_selector_match(sel, &pol->selector) &&
80c9abaa
SS		 4371 pol->type == type) {
4372 ret = pol;
4373 priority = ret->priority;
4374 break;
4375 }
4376 }
8d549c4f 4377 chain = &net->xfrm.policy_inexact[dir];
24969fac 4378 hlist_for_each_entry(pol, chain, bydst_inexact_list) {
8faf491e
LR		 4379 if ((pol->priority >= priority) && ret)
4380 break;
4381
c1aca308
YY		 4382 if ((if_id == 0 || pol->if_id == if_id) &&
4383 xfrm_migrate_selector_match(sel, &pol->selector) &&
8faf491e 4384 pol->type == type) {
80c9abaa
SS		 4385 ret = pol;
4386 break;
4387 }
4388 }
4389
586f2eb4 4390 xfrm_pol_hold(ret);
80c9abaa 4391
9d0380df 4392 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 4393
4394 return ret;
4395}
4396
dd701754 4397static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 4398{
4399 int match = 0;
4400
4401 if (t->mode == m->mode && t->id.proto == m->proto &&
4402 (m->reqid == 0 || t->reqid == m->reqid)) {
4403 switch (t->mode) {
4404 case XFRM_MODE_TUNNEL:
4405 case XFRM_MODE_BEET:
70e94e66
YH		 4406 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
4407 m->old_family) &&
4408 xfrm_addr_equal(&t->saddr, &m->old_saddr,
4409 m->old_family)) {
80c9abaa
SS		 4410 match = 1;
4411 }
4412 break;
4413 case XFRM_MODE_TRANSPORT:
4414 /* in case of transport mode, template does not store
4415 any IP addresses, hence we just compare mode and
4416 protocol */
4417 match = 1;
4418 break;
4419 default:
4420 break;
4421 }
4422 }
4423 return match;
4424}
4425
4426/* update endpoint address(es) of template(s) */
4427static int xfrm_policy_migrate(struct xfrm_policy *pol,
bd122403
SD		 4428 struct xfrm_migrate *m, int num_migrate,
4429 struct netlink_ext_ack *extack)
80c9abaa
SS		 4430{
4431 struct xfrm_migrate *mp;
80c9abaa
SS		 4432 int i, j, n = 0;
4433
4434 write_lock_bh(&pol->lock);
12a169e7 4435 if (unlikely(pol->walk.dead)) {
80c9abaa 4436 /* target policy has been deleted */
bd122403 4437 NL_SET_ERR_MSG(extack, "Target policy not found");
80c9abaa
SS		 4438 write_unlock_bh(&pol->lock);
4439 return -ENOENT;
4440 }
4441
4442 for (i = 0; i < pol->xfrm_nr; i++) {
4443 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
4444 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
4445 continue;
4446 n++;
1bfcb10f
HX		 4447 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
4448 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 4449 continue;
4450 /* update endpoints */
4451 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
4452 sizeof(pol->xfrm_vec[i].id.daddr));
4453 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
4454 sizeof(pol->xfrm_vec[i].saddr));
4455 pol->xfrm_vec[i].encap_family = mp->new_family;
4456 /* flush bundles */
80c802f3 4457 atomic_inc(&pol->genid);
80c9abaa
SS		 4458 }
4459 }
4460
4461 write_unlock_bh(&pol->lock);
4462
4463 if (!n)
4464 return -ENODATA;
4465
4466 return 0;
4467}
4468
bd122403
SD		 4469static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate,
4470 struct netlink_ext_ack *extack)
80c9abaa
SS		 4471{
4472 int i, j;
4473
bd122403
SD		 4474 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) {
4475 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
80c9abaa 4476 return -EINVAL;
bd122403 4477 }
80c9abaa
SS		 4478
4479 for (i = 0; i < num_migrate; i++) {
80c9abaa 4480 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
bd122403
SD		 4481 xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) {
4482 NL_SET_ERR_MSG(extack, "Addresses in the MIGRATE attribute's list cannot be null");
80c9abaa 4483 return -EINVAL;
bd122403 4484 }
80c9abaa
SS		 4485
4486 /* check if there is any duplicated entry */
4487 for (j = i + 1; j < num_migrate; j++) {
4488 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
4489 sizeof(m[i].old_daddr)) &&
4490 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
4491 sizeof(m[i].old_saddr)) &&
4492 m[i].proto == m[j].proto &&
4493 m[i].mode == m[j].mode &&
4494 m[i].reqid == m[j].reqid &&
bd122403
SD		 4495 m[i].old_family == m[j].old_family) {
4496 NL_SET_ERR_MSG(extack, "Entries in the MIGRATE attribute's list must be unique");
80c9abaa 4497 return -EINVAL;
bd122403 4498 }
80c9abaa
SS		 4499 }
4500 }
4501
4502 return 0;
4503}
4504
b4b7c0b3 4505int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 4506 struct xfrm_migrate *m, int num_migrate,
4ab47d47 4507 struct xfrm_kmaddress *k, struct net *net,
bd122403
SD		 4508 struct xfrm_encap_tmpl *encap, u32 if_id,
4509 struct netlink_ext_ack *extack)
80c9abaa
SS		 4510{
4511 int i, err, nx_cur = 0, nx_new = 0;
4512 struct xfrm_policy *pol = NULL;
4513 struct xfrm_state *x, *xc;
4514 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
4515 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
4516 struct xfrm_migrate *mp;
4517
7bab0963 4518 /* Stage 0 - sanity checks */
bd122403 4519 err = xfrm_migrate_check(m, num_migrate, extack);
f157c416 4520 if (err < 0)
80c9abaa
SS		 4521 goto out;
4522
7bab0963 4523 if (dir >= XFRM_POLICY_MAX) {
bd122403 4524 NL_SET_ERR_MSG(extack, "Invalid policy direction");
7bab0963
VD		 4525 err = -EINVAL;
4526 goto out;
4527 }
4528
80c9abaa 4529 /* Stage 1 - find policy */
f157c416
SD		 4530 pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id);
4531 if (!pol) {
bd122403 4532 NL_SET_ERR_MSG(extack, "Target policy not found");
80c9abaa
SS		 4533 err = -ENOENT;
4534 goto out;
4535 }
4536
4537 /* Stage 2 - find and update state(s) */
4538 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
c1aca308 4539 if ((x = xfrm_migrate_state_find(mp, net, if_id))) {
80c9abaa
SS		 4540 x_cur[nx_cur] = x;
4541 nx_cur++;
4ab47d47
AA		 4542 xc = xfrm_state_migrate(x, mp, encap);
4543 if (xc) {
80c9abaa
SS		 4544 x_new[nx_new] = xc;
4545 nx_new++;
4546 } else {
4547 err = -ENODATA;
4548 goto restore_state;
4549 }
4550 }
4551 }
4552
4553 /* Stage 3 - update policy */
bd122403 4554 err = xfrm_policy_migrate(pol, m, num_migrate, extack);
f157c416 4555 if (err < 0)
80c9abaa
SS		 4556 goto restore_state;
4557
4558 /* Stage 4 - delete old state(s) */
4559 if (nx_cur) {
4560 xfrm_states_put(x_cur, nx_cur);
4561 xfrm_states_delete(x_cur, nx_cur);
4562 }
4563
4564 /* Stage 5 - announce */
8bafd730 4565 km_migrate(sel, dir, type, m, num_migrate, k, encap);
80c9abaa
SS		 4566
4567 xfrm_pol_put(pol);
4568
4569 return 0;
4570out:
4571 return err;
4572
4573restore_state:
4574 if (pol)
4575 xfrm_pol_put(pol);
4576 if (nx_cur)
4577 xfrm_states_put(x_cur, nx_cur);
4578 if (nx_new)
4579 xfrm_states_delete(x_new, nx_new);
4580
4581 return err;
4582}
e610e679 4583EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 4584#endif
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git