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treewide: use get_random_u32_below() instead of deprecated function
[linux-block.git] / net / xfrm / xfrm_state.c
CommitLineData
457c8996 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * xfrm_state.c
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 * YOSHIFUJI Hideaki @USAGI
11 * Split up af-specific functions
12 * Derek Atkins <derek@ihtfp.com>
13 * Add UDP Encapsulation
df71837d 14 *
1da177e4
LT		 15 */
16
b6459415 17#include <linux/compat.h>
1da177e4
LT		 18#include <linux/workqueue.h>
19#include <net/xfrm.h>
20#include <linux/pfkeyv2.h>
21#include <linux/ipsec.h>
22#include <linux/module.h>
f034b5d4 23#include <linux/cache.h>
68277acc 24#include <linux/audit.h>
7c0f6ba6 25#include <linux/uaccess.h>
9e0d57fd 26#include <linux/ktime.h>
5a0e3ad6 27#include <linux/slab.h>
9e0d57fd
YP		 28#include <linux/interrupt.h>
29#include <linux/kernel.h>
1da177e4 30
c7b37c76
FW		 31#include <crypto/aead.h>
32
44e36b42
DM		 33#include "xfrm_hash.h"
34
c8406998
FW		 35#define xfrm_state_deref_prot(table, net) \
36 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
37
35db57bb
FW		 38static void xfrm_state_gc_task(struct work_struct *work);
39
1da177e4
LT		 40/* Each xfrm_state may be linked to two tables:
41
42 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
a624c108 43 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
1da177e4
LT		 44 destination/tunnel endpoint. (output)
45 */
46
f034b5d4 47static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
565f0fa9 48static struct kmem_cache *xfrm_state_cache __ro_after_init;
f034b5d4 49
35db57bb
FW		 50static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
51static HLIST_HEAD(xfrm_state_gc_list);
52
02efdff7
FW		 53static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
54{
88755e9c 55 return refcount_inc_not_zero(&x->refcnt);
02efdff7
FW		 56}
57
64d0cd00 58static inline unsigned int xfrm_dst_hash(struct net *net,
2ab38503
DM		 59 const xfrm_address_t *daddr,
60 const xfrm_address_t *saddr,
c1969f29 61 u32 reqid,
a624c108 62 unsigned short family)
f034b5d4 63{
64d0cd00 64 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
f034b5d4
DM		 65}
66
64d0cd00 67static inline unsigned int xfrm_src_hash(struct net *net,
2ab38503
DM		 68 const xfrm_address_t *daddr,
69 const xfrm_address_t *saddr,
44e36b42 70 unsigned short family)
f034b5d4 71{
64d0cd00 72 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
f034b5d4
DM		 73}
74
f034b5d4 75static inline unsigned int
2ab38503
DM		 76xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
77 __be32 spi, u8 proto, unsigned short family)
f034b5d4 78{
64d0cd00 79 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
f034b5d4
DM		 80}
81
fe9f1d87
SD		 82static unsigned int xfrm_seq_hash(struct net *net, u32 seq)
83{
84 return __xfrm_seq_hash(seq, net->xfrm.state_hmask);
85}
86
f034b5d4
DM		 87static void xfrm_hash_transfer(struct hlist_head *list,
88 struct hlist_head *ndsttable,
89 struct hlist_head *nsrctable,
90 struct hlist_head *nspitable,
fe9f1d87 91 struct hlist_head *nseqtable,
f034b5d4
DM		 92 unsigned int nhashmask)
93{
b67bfe0d 94 struct hlist_node *tmp;
f034b5d4
DM		 95 struct xfrm_state *x;
96
b67bfe0d 97 hlist_for_each_entry_safe(x, tmp, list, bydst) {
f034b5d4
DM		 98 unsigned int h;
99
c1969f29
DM		 100 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
101 x->props.reqid, x->props.family,
102 nhashmask);
ae3fb6d3 103 hlist_add_head_rcu(&x->bydst, ndsttable + h);
f034b5d4 104
667bbcb6
MN		 105 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
106 x->props.family,
f034b5d4 107 nhashmask);
ae3fb6d3 108 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
f034b5d4 109
7b4dc360
MN		 110 if (x->id.spi) {
111 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
112 x->id.proto, x->props.family,
113 nhashmask);
ae3fb6d3 114 hlist_add_head_rcu(&x->byspi, nspitable + h);
7b4dc360 115 }
fe9f1d87
SD		 116
117 if (x->km.seq) {
118 h = __xfrm_seq_hash(x->km.seq, nhashmask);
119 hlist_add_head_rcu(&x->byseq, nseqtable + h);
120 }
f034b5d4
DM		 121 }
122}
123
63082733 124static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
f034b5d4 125{
63082733 126 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
f034b5d4
DM		 127}
128
63082733 129static void xfrm_hash_resize(struct work_struct *work)
f034b5d4 130{
63082733 131 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
fe9f1d87 132 struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
f034b5d4
DM		 133 unsigned long nsize, osize;
134 unsigned int nhashmask, ohashmask;
135 int i;
136
63082733 137 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
44e36b42 138 ndst = xfrm_hash_alloc(nsize);
f034b5d4 139 if (!ndst)
0244790c 140 return;
44e36b42 141 nsrc = xfrm_hash_alloc(nsize);
f034b5d4 142 if (!nsrc) {
44e36b42 143 xfrm_hash_free(ndst, nsize);
0244790c 144 return;
f034b5d4 145 }
44e36b42 146 nspi = xfrm_hash_alloc(nsize);
f034b5d4 147 if (!nspi) {
44e36b42
DM		 148 xfrm_hash_free(ndst, nsize);
149 xfrm_hash_free(nsrc, nsize);
0244790c 150 return;
f034b5d4 151 }
fe9f1d87
SD		 152 nseq = xfrm_hash_alloc(nsize);
153 if (!nseq) {
154 xfrm_hash_free(ndst, nsize);
155 xfrm_hash_free(nsrc, nsize);
156 xfrm_hash_free(nspi, nsize);
157 return;
158 }
f034b5d4 159
283bc9f3 160 spin_lock_bh(&net->xfrm.xfrm_state_lock);
e88add19 161 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
f034b5d4
DM		 162
163 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
c8406998 164 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
63082733 165 for (i = net->xfrm.state_hmask; i >= 0; i--)
fe9f1d87 166 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
f034b5d4 167
c8406998
FW		 168 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
169 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
fe9f1d87 170 oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
63082733 171 ohashmask = net->xfrm.state_hmask;
f034b5d4 172
c8406998
FW		 173 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
174 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
175 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
fe9f1d87 176 rcu_assign_pointer(net->xfrm.state_byseq, nseq);
63082733 177 net->xfrm.state_hmask = nhashmask;
f034b5d4 178
e88add19 179 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
283bc9f3 180 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
f034b5d4
DM		 181
182 osize = (ohashmask + 1) * sizeof(struct hlist_head);
df7274eb
FW		 183
184 synchronize_rcu();
185
44e36b42
DM		 186 xfrm_hash_free(odst, osize);
187 xfrm_hash_free(osrc, osize);
188 xfrm_hash_free(ospi, osize);
fe9f1d87 189 xfrm_hash_free(oseq, osize);
f034b5d4
DM		 190}
191
44abdc30
CW		 192static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
193static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
1da177e4 194
1da177e4
LT		 195static DEFINE_SPINLOCK(xfrm_state_gc_lock);
196
53bc6b4d 197int __xfrm_state_delete(struct xfrm_state *x);
1da177e4 198
980ebd25 199int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
bb9cd077 200static bool km_is_alive(const struct km_event *c);
15e47304 201void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
1da177e4 202
533cb5b0 203int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
aa5d62cc 204{
7a9885b9 205 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
aa5d62cc
HX		 206 int err = 0;
207
4f518e80 208 if (!afinfo)
aa5d62cc 209 return -EAFNOSUPPORT;
4f518e80
FW		 210
211#define X(afi, T, name) do { \
212 WARN_ON((afi)->type_ ## name); \
213 (afi)->type_ ## name = (T); \
214 } while (0)
215
216 switch (type->proto) {
217 case IPPROTO_COMP:
218 X(afinfo, type, comp);
219 break;
220 case IPPROTO_AH:
221 X(afinfo, type, ah);
222 break;
223 case IPPROTO_ESP:
224 X(afinfo, type, esp);
225 break;
226 case IPPROTO_IPIP:
227 X(afinfo, type, ipip);
228 break;
229 case IPPROTO_DSTOPTS:
230 X(afinfo, type, dstopts);
231 break;
232 case IPPROTO_ROUTING:
233 X(afinfo, type, routing);
234 break;
235 case IPPROTO_IPV6:
236 X(afinfo, type, ipip6);
237 break;
238 default:
239 WARN_ON(1);
240 err = -EPROTONOSUPPORT;
241 break;
242 }
243#undef X
af5d27c4 244 rcu_read_unlock();
aa5d62cc
HX		 245 return err;
246}
247EXPORT_SYMBOL(xfrm_register_type);
248
4f518e80 249void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
aa5d62cc 250{
7a9885b9 251 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
aa5d62cc
HX		 252
253 if (unlikely(afinfo == NULL))
4f518e80
FW		 254 return;
255
256#define X(afi, T, name) do { \
257 WARN_ON((afi)->type_ ## name != (T)); \
258 (afi)->type_ ## name = NULL; \
259 } while (0)
260
261 switch (type->proto) {
262 case IPPROTO_COMP:
263 X(afinfo, type, comp);
264 break;
265 case IPPROTO_AH:
266 X(afinfo, type, ah);
267 break;
268 case IPPROTO_ESP:
269 X(afinfo, type, esp);
270 break;
271 case IPPROTO_IPIP:
272 X(afinfo, type, ipip);
273 break;
274 case IPPROTO_DSTOPTS:
275 X(afinfo, type, dstopts);
276 break;
277 case IPPROTO_ROUTING:
278 X(afinfo, type, routing);
279 break;
280 case IPPROTO_IPV6:
281 X(afinfo, type, ipip6);
282 break;
283 default:
284 WARN_ON(1);
285 break;
286 }
287#undef X
af5d27c4 288 rcu_read_unlock();
aa5d62cc
HX		 289}
290EXPORT_SYMBOL(xfrm_unregister_type);
291
533cb5b0 292static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
aa5d62cc 293{
4f518e80 294 const struct xfrm_type *type = NULL;
aa5d62cc 295 struct xfrm_state_afinfo *afinfo;
aa5d62cc
HX		 296 int modload_attempted = 0;
297
298retry:
299 afinfo = xfrm_state_get_afinfo(family);
300 if (unlikely(afinfo == NULL))
301 return NULL;
aa5d62cc 302
4f518e80
FW		 303 switch (proto) {
304 case IPPROTO_COMP:
305 type = afinfo->type_comp;
306 break;
307 case IPPROTO_AH:
308 type = afinfo->type_ah;
309 break;
310 case IPPROTO_ESP:
311 type = afinfo->type_esp;
312 break;
313 case IPPROTO_IPIP:
314 type = afinfo->type_ipip;
315 break;
316 case IPPROTO_DSTOPTS:
317 type = afinfo->type_dstopts;
318 break;
319 case IPPROTO_ROUTING:
320 type = afinfo->type_routing;
321 break;
322 case IPPROTO_IPV6:
323 type = afinfo->type_ipip6;
324 break;
325 default:
326 break;
327 }
328
aa5d62cc
HX		 329 if (unlikely(type && !try_module_get(type->owner)))
330 type = NULL;
75cda62d
FW		 331
332 rcu_read_unlock();
333
aa5d62cc 334 if (!type && !modload_attempted) {
aa5d62cc
HX		 335 request_module("xfrm-type-%d-%d", family, proto);
336 modload_attempted = 1;
337 goto retry;
338 }
339
aa5d62cc
HX		 340 return type;
341}
342
533cb5b0 343static void xfrm_put_type(const struct xfrm_type *type)
aa5d62cc
HX		 344{
345 module_put(type->owner);
346}
347
9d389d7f
SK		 348int xfrm_register_type_offload(const struct xfrm_type_offload *type,
349 unsigned short family)
350{
351 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
9d389d7f
SK		 352 int err = 0;
353
354 if (unlikely(afinfo == NULL))
355 return -EAFNOSUPPORT;
4f518e80
FW		 356
357 switch (type->proto) {
358 case IPPROTO_ESP:
359 WARN_ON(afinfo->type_offload_esp);
360 afinfo->type_offload_esp = type;
361 break;
362 default:
363 WARN_ON(1);
364 err = -EPROTONOSUPPORT;
365 break;
366 }
367
9d389d7f
SK		 368 rcu_read_unlock();
369 return err;
370}
371EXPORT_SYMBOL(xfrm_register_type_offload);
372
4f518e80
FW		 373void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
374 unsigned short family)
9d389d7f
SK		 375{
376 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
9d389d7f
SK		 377
378 if (unlikely(afinfo == NULL))
4f518e80
FW		 379 return;
380
381 switch (type->proto) {
382 case IPPROTO_ESP:
383 WARN_ON(afinfo->type_offload_esp != type);
384 afinfo->type_offload_esp = NULL;
385 break;
386 default:
387 WARN_ON(1);
388 break;
389 }
9d389d7f 390 rcu_read_unlock();
9d389d7f
SK		 391}
392EXPORT_SYMBOL(xfrm_unregister_type_offload);
393
ffdb5211
IT		 394static const struct xfrm_type_offload *
395xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
9d389d7f 396{
4f518e80 397 const struct xfrm_type_offload *type = NULL;
9d389d7f 398 struct xfrm_state_afinfo *afinfo;
9d389d7f 399
ffdb5211 400retry:
9d389d7f
SK		 401 afinfo = xfrm_state_get_afinfo(family);
402 if (unlikely(afinfo == NULL))
403 return NULL;
9d389d7f 404
4f518e80
FW		 405 switch (proto) {
406 case IPPROTO_ESP:
407 type = afinfo->type_offload_esp;
408 break;
409 default:
410 break;
411 }
412
9d389d7f
SK		 413 if ((type && !try_module_get(type->owner)))
414 type = NULL;
415
2f10a61c
SD		 416 rcu_read_unlock();
417
ffdb5211
IT		 418 if (!type && try_load) {
419 request_module("xfrm-offload-%d-%d", family, proto);
545d8ae7 420 try_load = false;
ffdb5211
IT		 421 goto retry;
422 }
423
9d389d7f
SK		 424 return type;
425}
426
427static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
428{
429 module_put(type->owner);
430}
431
4c145dce
FW		 432static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
433 [XFRM_MODE_BEET] = {
434 .encap = XFRM_MODE_BEET,
435 .flags = XFRM_MODE_FLAG_TUNNEL,
436 .family = AF_INET,
437 },
438 [XFRM_MODE_TRANSPORT] = {
439 .encap = XFRM_MODE_TRANSPORT,
440 .family = AF_INET,
441 },
442 [XFRM_MODE_TUNNEL] = {
443 .encap = XFRM_MODE_TUNNEL,
444 .flags = XFRM_MODE_FLAG_TUNNEL,
445 .family = AF_INET,
446 },
447};
448
449static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
450 [XFRM_MODE_BEET] = {
451 .encap = XFRM_MODE_BEET,
452 .flags = XFRM_MODE_FLAG_TUNNEL,
453 .family = AF_INET6,
454 },
455 [XFRM_MODE_ROUTEOPTIMIZATION] = {
456 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
457 .family = AF_INET6,
458 },
459 [XFRM_MODE_TRANSPORT] = {
460 .encap = XFRM_MODE_TRANSPORT,
461 .family = AF_INET6,
462 },
463 [XFRM_MODE_TUNNEL] = {
464 .encap = XFRM_MODE_TUNNEL,
465 .flags = XFRM_MODE_FLAG_TUNNEL,
466 .family = AF_INET6,
467 },
468};
469
470static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
471{
472 const struct xfrm_mode *mode;
aa5d62cc
HX		 473
474 if (unlikely(encap >= XFRM_MODE_MAX))
475 return NULL;
476
4c145dce
FW		 477 switch (family) {
478 case AF_INET:
479 mode = &xfrm4_mode_map[encap];
480 if (mode->family == family)
481 return mode;
482 break;
483 case AF_INET6:
484 mode = &xfrm6_mode_map[encap];
485 if (mode->family == family)
486 return mode;
487 break;
488 default:
489 break;
aa5d62cc
HX		 490 }
491
4c145dce 492 return NULL;
aa5d62cc
HX		 493}
494
4a135e53
MK		 495void xfrm_state_free(struct xfrm_state *x)
496{
497 kmem_cache_free(xfrm_state_cache, x);
498}
499EXPORT_SYMBOL(xfrm_state_free);
500
f75a2804 501static void ___xfrm_state_destroy(struct xfrm_state *x)
1da177e4 502{
671422b2 503 hrtimer_cancel(&x->mtimer);
a47f0ce0 504 del_timer_sync(&x->rtimer);
b5884793 505 kfree(x->aead);
a51482bd
JJ		 506 kfree(x->aalg);
507 kfree(x->ealg);
508 kfree(x->calg);
509 kfree(x->encap);
060f02a3 510 kfree(x->coaddr);
d8647b79
SK		 511 kfree(x->replay_esn);
512 kfree(x->preplay_esn);
9d389d7f
SK		 513 if (x->type_offload)
514 xfrm_put_type_offload(x->type_offload);
1da177e4
LT		 515 if (x->type) {
516 x->type->destructor(x);
517 xfrm_put_type(x->type);
518 }
86c6739e
SK		 519 if (x->xfrag.page)
520 put_page(x->xfrag.page);
d77e38e6 521 xfrm_dev_state_free(x);
df71837d 522 security_xfrm_state_free(x);
4a135e53 523 xfrm_state_free(x);
1da177e4
LT		 524}
525
c7837144 526static void xfrm_state_gc_task(struct work_struct *work)
1da177e4 527{
12a169e7 528 struct xfrm_state *x;
b67bfe0d 529 struct hlist_node *tmp;
12a169e7 530 struct hlist_head gc_list;
1da177e4 531
1da177e4 532 spin_lock_bh(&xfrm_state_gc_lock);
35db57bb 533 hlist_move_list(&xfrm_state_gc_list, &gc_list);
1da177e4
LT		 534 spin_unlock_bh(&xfrm_state_gc_lock);
535
df7274eb
FW		 536 synchronize_rcu();
537
b67bfe0d 538 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
f75a2804 539 ___xfrm_state_destroy(x);
1da177e4
LT		 540}
541
3e94c2dc 542static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
1da177e4 543{
671422b2
TG		 544 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
545 enum hrtimer_restart ret = HRTIMER_NORESTART;
386c5680
AB		 546 time64_t now = ktime_get_real_seconds();
547 time64_t next = TIME64_MAX;
1da177e4 548 int warn = 0;
161a09e7 549 int err = 0;
1da177e4
LT		 550
551 spin_lock(&x->lock);
552 if (x->km.state == XFRM_STATE_DEAD)
553 goto out;
554 if (x->km.state == XFRM_STATE_EXPIRED)
555 goto expired;
556 if (x->lft.hard_add_expires_seconds) {
557 long tmo = x->lft.hard_add_expires_seconds +
558 x->curlft.add_time - now;
e3c0d047
FD		 559 if (tmo <= 0) {
560 if (x->xflags & XFRM_SOFT_EXPIRE) {
561 /* enter hard expire without soft expire first?!
562 * setting a new date could trigger this.
1365e547 563 * workaround: fix x->curflt.add_time by below:
e3c0d047
FD		 564 */
565 x->curlft.add_time = now - x->saved_tmo - 1;
566 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
567 } else
568 goto expired;
569 }
1da177e4
LT		 570 if (tmo < next)
571 next = tmo;
572 }
573 if (x->lft.hard_use_expires_seconds) {
574 long tmo = x->lft.hard_use_expires_seconds +
575 (x->curlft.use_time ? : now) - now;
576 if (tmo <= 0)
577 goto expired;
578 if (tmo < next)
579 next = tmo;
580 }
581 if (x->km.dying)
582 goto resched;
583 if (x->lft.soft_add_expires_seconds) {
584 long tmo = x->lft.soft_add_expires_seconds +
585 x->curlft.add_time - now;
e3c0d047 586 if (tmo <= 0) {
1da177e4 587 warn = 1;
e3c0d047
FD		 588 x->xflags &= ~XFRM_SOFT_EXPIRE;
589 } else if (tmo < next) {
1da177e4 590 next = tmo;
e3c0d047
FD		 591 x->xflags |= XFRM_SOFT_EXPIRE;
592 x->saved_tmo = tmo;
593 }
1da177e4
LT		 594 }
595 if (x->lft.soft_use_expires_seconds) {
596 long tmo = x->lft.soft_use_expires_seconds +
597 (x->curlft.use_time ? : now) - now;
598 if (tmo <= 0)
599 warn = 1;
600 else if (tmo < next)
601 next = tmo;
602 }
603
4666faab 604 x->km.dying = warn;
1da177e4 605 if (warn)
53bc6b4d 606 km_state_expired(x, 0, 0);
1da177e4 607resched:
386c5680 608 if (next != TIME64_MAX) {
671422b2
TG		 609 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
610 ret = HRTIMER_RESTART;
9e0d57fd 611 }
a47f0ce0 612
1da177e4
LT		 613 goto out;
614
615expired:
5b8ef341 616 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
1da177e4 617 x->km.state = XFRM_STATE_EXPIRED;
161a09e7
JL		 618
619 err = __xfrm_state_delete(x);
0806ae4c 620 if (!err)
53bc6b4d 621 km_state_expired(x, 1, 0);
1da177e4 622
2e71029e 623 xfrm_audit_state_delete(x, err ? 0 : 1, true);
161a09e7 624
1da177e4
LT		 625out:
626 spin_unlock(&x->lock);
671422b2 627 return ret;
1da177e4
LT		 628}
629
e99e88a9 630static void xfrm_replay_timer_handler(struct timer_list *t);
0ac84752 631
673c09be 632struct xfrm_state *xfrm_state_alloc(struct net *net)
1da177e4
LT		 633{
634 struct xfrm_state *x;
635
a4c278d1 636 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
1da177e4
LT		 637
638 if (x) {
673c09be 639 write_pnet(&x->xs_net, net);
88755e9c 640 refcount_set(&x->refcnt, 1);
1da177e4 641 atomic_set(&x->tunnel_users, 0);
12a169e7 642 INIT_LIST_HEAD(&x->km.all);
8f126e37
DM		 643 INIT_HLIST_NODE(&x->bydst);
644 INIT_HLIST_NODE(&x->bysrc);
645 INIT_HLIST_NODE(&x->byspi);
fe9f1d87 646 INIT_HLIST_NODE(&x->byseq);
671422b2
TG		 647 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
648 x->mtimer.function = xfrm_timer_handler;
e99e88a9 649 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
386c5680 650 x->curlft.add_time = ktime_get_real_seconds();
1da177e4
LT		 651 x->lft.soft_byte_limit = XFRM_INF;
652 x->lft.soft_packet_limit = XFRM_INF;
653 x->lft.hard_byte_limit = XFRM_INF;
654 x->lft.hard_packet_limit = XFRM_INF;
f8cd5488
JHS		 655 x->replay_maxage = 0;
656 x->replay_maxdiff = 0;
1da177e4
LT		 657 spin_lock_init(&x->lock);
658 }
659 return x;
660}
661EXPORT_SYMBOL(xfrm_state_alloc);
662
f75a2804 663void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
1da177e4 664{
547b792c 665 WARN_ON(x->km.state != XFRM_STATE_DEAD);
1da177e4 666
f75a2804
CW		 667 if (sync) {
668 synchronize_rcu();
669 ___xfrm_state_destroy(x);
670 } else {
671 spin_lock_bh(&xfrm_state_gc_lock);
672 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
673 spin_unlock_bh(&xfrm_state_gc_lock);
674 schedule_work(&xfrm_state_gc_work);
675 }
1da177e4
LT		 676}
677EXPORT_SYMBOL(__xfrm_state_destroy);
678
53bc6b4d 679int __xfrm_state_delete(struct xfrm_state *x)
1da177e4 680{
98806f75 681 struct net *net = xs_net(x);
26b15dad
JHS		 682 int err = -ESRCH;
683
1da177e4
LT		 684 if (x->km.state != XFRM_STATE_DEAD) {
685 x->km.state = XFRM_STATE_DEAD;
283bc9f3 686 spin_lock(&net->xfrm.xfrm_state_lock);
12a169e7 687 list_del(&x->km.all);
ae3fb6d3
FW		 688 hlist_del_rcu(&x->bydst);
689 hlist_del_rcu(&x->bysrc);
fe9f1d87
SD		 690 if (x->km.seq)
691 hlist_del_rcu(&x->byseq);
a47f0ce0 692 if (x->id.spi)
ae3fb6d3 693 hlist_del_rcu(&x->byspi);
98806f75 694 net->xfrm.state_num--;
283bc9f3 695 spin_unlock(&net->xfrm.xfrm_state_lock);
1da177e4 696
e27cca96
SD		 697 if (x->encap_sk)
698 sock_put(rcu_dereference_raw(x->encap_sk));
699
d77e38e6
SK		 700 xfrm_dev_state_delete(x);
701
1da177e4
LT		 702 /* All xfrm_state objects are created by xfrm_state_alloc.
703 * The xfrm_state_alloc call gives a reference, and that
704 * is what we are dropping here.
705 */
5dba4797 706 xfrm_state_put(x);
26b15dad 707 err = 0;
1da177e4 708 }
26b15dad
JHS		 709
710 return err;
1da177e4 711}
53bc6b4d 712EXPORT_SYMBOL(__xfrm_state_delete);
1da177e4 713
26b15dad 714int xfrm_state_delete(struct xfrm_state *x)
1da177e4 715{
26b15dad
JHS		 716 int err;
717
1da177e4 718 spin_lock_bh(&x->lock);
26b15dad 719 err = __xfrm_state_delete(x);
1da177e4 720 spin_unlock_bh(&x->lock);
26b15dad
JHS		 721
722 return err;
1da177e4
LT		 723}
724EXPORT_SYMBOL(xfrm_state_delete);
725
4aa2e62c
JL		 726#ifdef CONFIG_SECURITY_NETWORK_XFRM
727static inline int
2e71029e 728xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
1da177e4 729{
4aa2e62c
JL		 730 int i, err = 0;
731
0e602451 732 for (i = 0; i <= net->xfrm.state_hmask; i++) {
4aa2e62c
JL		 733 struct xfrm_state *x;
734
b67bfe0d 735 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
4aa2e62c
JL		 736 if (xfrm_id_proto_match(x->id.proto, proto) &&
737 (err = security_xfrm_state_delete(x)) != 0) {
2e71029e 738 xfrm_audit_state_delete(x, 0, task_valid);
4aa2e62c
JL		 739 return err;
740 }
741 }
742 }
743
744 return err;
745}
d77e38e6
SK		 746
747static inline int
748xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
749{
750 int i, err = 0;
751
752 for (i = 0; i <= net->xfrm.state_hmask; i++) {
753 struct xfrm_state *x;
87e0a94e 754 struct xfrm_dev_offload *xso;
d77e38e6
SK		 755
756 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
757 xso = &x->xso;
758
759 if (xso->dev == dev &&
760 (err = security_xfrm_state_delete(x)) != 0) {
761 xfrm_audit_state_delete(x, 0, task_valid);
762 return err;
763 }
764 }
765 }
766
767 return err;
768}
4aa2e62c
JL		 769#else
770static inline int
2e71029e 771xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
4aa2e62c
JL		 772{
773 return 0;
774}
d77e38e6
SK		 775
776static inline int
777xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
778{
779 return 0;
780}
4aa2e62c
JL		 781#endif
782
f75a2804 783int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
4aa2e62c 784{
9e64cc95 785 int i, err = 0, cnt = 0;
1da177e4 786
283bc9f3 787 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2e71029e 788 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
4aa2e62c
JL		 789 if (err)
790 goto out;
791
9e64cc95 792 err = -ESRCH;
0e602451 793 for (i = 0; i <= net->xfrm.state_hmask; i++) {
8f126e37 794 struct xfrm_state *x;
1da177e4 795restart:
b67bfe0d 796 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1da177e4 797 if (!xfrm_state_kern(x) &&
5794708f 798 xfrm_id_proto_match(x->id.proto, proto)) {
1da177e4 799 xfrm_state_hold(x);
283bc9f3 800 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 801
161a09e7 802 err = xfrm_state_delete(x);
ab5f5e8b 803 xfrm_audit_state_delete(x, err ? 0 : 1,
2e71029e 804 task_valid);
f75a2804
CW		 805 if (sync)
806 xfrm_state_put_sync(x);
807 else
808 xfrm_state_put(x);
9e64cc95
JHS		 809 if (!err)
810 cnt++;
1da177e4 811
283bc9f3 812 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 813 goto restart;
814 }
815 }
816 }
dd269db8
AS		 817out:
818 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
e4db5b61 819 if (cnt)
9e64cc95 820 err = 0;
e4db5b61 821
4aa2e62c 822 return err;
1da177e4
LT		 823}
824EXPORT_SYMBOL(xfrm_state_flush);
825
d77e38e6
SK		 826int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
827{
828 int i, err = 0, cnt = 0;
829
830 spin_lock_bh(&net->xfrm.xfrm_state_lock);
831 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
832 if (err)
833 goto out;
834
835 err = -ESRCH;
836 for (i = 0; i <= net->xfrm.state_hmask; i++) {
837 struct xfrm_state *x;
87e0a94e 838 struct xfrm_dev_offload *xso;
d77e38e6
SK		 839restart:
840 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
841 xso = &x->xso;
842
843 if (!xfrm_state_kern(x) && xso->dev == dev) {
844 xfrm_state_hold(x);
845 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
846
847 err = xfrm_state_delete(x);
848 xfrm_audit_state_delete(x, err ? 0 : 1,
849 task_valid);
850 xfrm_state_put(x);
851 if (!err)
852 cnt++;
853
854 spin_lock_bh(&net->xfrm.xfrm_state_lock);
855 goto restart;
856 }
857 }
858 }
859 if (cnt)
860 err = 0;
861
862out:
863 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
864 return err;
865}
866EXPORT_SYMBOL(xfrm_dev_state_flush);
867
e071041b 868void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
28d8909b 869{
283bc9f3 870 spin_lock_bh(&net->xfrm.xfrm_state_lock);
e071041b 871 si->sadcnt = net->xfrm.state_num;
ca92e173 872 si->sadhcnt = net->xfrm.state_hmask + 1;
28d8909b 873 si->sadhmcnt = xfrm_state_hashmax;
283bc9f3 874 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
28d8909b
JHS		 875}
876EXPORT_SYMBOL(xfrm_sad_getinfo);
877
bac95935
FW		 878static void
879__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
880{
881 const struct flowi4 *fl4 = &fl->u.ip4;
882
883 sel->daddr.a4 = fl4->daddr;
884 sel->saddr.a4 = fl4->saddr;
885 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
886 sel->dport_mask = htons(0xffff);
887 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
888 sel->sport_mask = htons(0xffff);
889 sel->family = AF_INET;
890 sel->prefixlen_d = 32;
891 sel->prefixlen_s = 32;
892 sel->proto = fl4->flowi4_proto;
893 sel->ifindex = fl4->flowi4_oif;
894}
895
896static void
897__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
898{
899 const struct flowi6 *fl6 = &fl->u.ip6;
900
901 /* Initialize temporary selector matching only to current session. */
902 *(struct in6_addr *)&sel->daddr = fl6->daddr;
903 *(struct in6_addr *)&sel->saddr = fl6->saddr;
904 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
905 sel->dport_mask = htons(0xffff);
906 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
907 sel->sport_mask = htons(0xffff);
908 sel->family = AF_INET6;
909 sel->prefixlen_d = 128;
910 sel->prefixlen_s = 128;
911 sel->proto = fl6->flowi6_proto;
912 sel->ifindex = fl6->flowi6_oif;
913}
914
711059b9 915static void
1a898592 916xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
04686013 917 const struct xfrm_tmpl *tmpl,
33765d06 918 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
8444cf71 919 unsigned short family)
1da177e4 920{
bac95935
FW		 921 switch (family) {
922 case AF_INET:
923 __xfrm4_init_tempsel(&x->sel, fl);
924 break;
925 case AF_INET6:
926 __xfrm6_init_tempsel(&x->sel, fl);
927 break;
928 }
929
5c1b9ab3 930 x->id = tmpl->id;
bac95935 931
5c1b9ab3
FW		 932 switch (tmpl->encap_family) {
933 case AF_INET:
934 if (x->id.daddr.a4 == 0)
935 x->id.daddr.a4 = daddr->a4;
936 x->props.saddr = tmpl->saddr;
937 if (x->props.saddr.a4 == 0)
938 x->props.saddr.a4 = saddr->a4;
939 break;
940 case AF_INET6:
941 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
942 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
943 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
944 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
945 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
946 break;
947 }
3819a35f 948
5c1b9ab3
FW		 949 x->props.mode = tmpl->mode;
950 x->props.reqid = tmpl->reqid;
951 x->props.family = tmpl->encap_family;
1da177e4
LT		 952}
953
9aa60088
DM		 954static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
955 const xfrm_address_t *daddr,
956 __be32 spi, u8 proto,
957 unsigned short family)
edcd5821 958{
221df1ed 959 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
edcd5821
DM		 960 struct xfrm_state *x;
961
ae3fb6d3 962 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
edcd5821
DM		 963 if (x->props.family != family ||
964 x->id.spi != spi ||
1802571b 965 x->id.proto != proto ||
70e94e66 966 !xfrm_addr_equal(&x->id.daddr, daddr, family))
edcd5821
DM		 967 continue;
968
3d6acfa7
JHS		 969 if ((mark & x->mark.m) != x->mark.v)
970 continue;
02efdff7
FW		 971 if (!xfrm_state_hold_rcu(x))
972 continue;
edcd5821
DM		 973 return x;
974 }
975
976 return NULL;
977}
978
9aa60088
DM		 979static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
980 const xfrm_address_t *daddr,
981 const xfrm_address_t *saddr,
982 u8 proto, unsigned short family)
edcd5821 983{
221df1ed 984 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
edcd5821
DM		 985 struct xfrm_state *x;
986
ae3fb6d3 987 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
edcd5821 988 if (x->props.family != family ||
1802571b 989 x->id.proto != proto ||
70e94e66
YH		 990 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
991 !xfrm_addr_equal(&x->props.saddr, saddr, family))
edcd5821
DM		 992 continue;
993
3d6acfa7
JHS		 994 if ((mark & x->mark.m) != x->mark.v)
995 continue;
02efdff7
FW		 996 if (!xfrm_state_hold_rcu(x))
997 continue;
edcd5821
DM		 998 return x;
999 }
1000
1001 return NULL;
1002}
1003
1004static inline struct xfrm_state *
1005__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1006{
221df1ed 1007 struct net *net = xs_net(x);
bd55775c 1008 u32 mark = x->mark.v & x->mark.m;
221df1ed 1009
edcd5821 1010 if (use_spi)
bd55775c
JHS		 1011 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1012 x->id.spi, x->id.proto, family);
edcd5821 1013 else
bd55775c
JHS		 1014 return __xfrm_state_lookup_byaddr(net, mark,
1015 &x->id.daddr,
edcd5821
DM		 1016 &x->props.saddr,
1017 x->id.proto, family);
1018}
1019
98806f75 1020static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
2fab22f2
PM		 1021{
1022 if (have_hash_collision &&
98806f75
AD		 1023 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1024 net->xfrm.state_num > net->xfrm.state_hmask)
1025 schedule_work(&net->xfrm.state_hash_work);
2fab22f2
PM		 1026}
1027
08ec9af1 1028static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
4a08ab0f 1029 const struct flowi *fl, unsigned short family,
08ec9af1
DM		 1030 struct xfrm_state **best, int *acq_in_progress,
1031 int *error)
1032{
1033 /* Resolution logic:
1034 * 1. There is a valid state with matching selector. Done.
1035 * 2. Valid state with inappropriate selector. Skip.
1036 *
1037 * Entering area of "sysdeps".
1038 *
1039 * 3. If state is not valid, selector is temporary, it selects
1040 * only session which triggered previous resolution. Key
1041 * manager will do something to install a state with proper
1042 * selector.
1043 */
1044 if (x->km.state == XFRM_STATE_VALID) {
1045 if ((x->sel.family &&
e94ee171
HX		 1046 (x->sel.family != family ||
1047 !xfrm_selector_match(&x->sel, fl, family))) ||
3df98d79
PM		 1048 !security_xfrm_state_pol_flow_match(x, pol,
1049 &fl->u.__fl_common))
08ec9af1
DM		 1050 return;
1051
1052 if (!*best ||
1053 (*best)->km.dying > x->km.dying ||
1054 ((*best)->km.dying == x->km.dying &&
1055 (*best)->curlft.add_time < x->curlft.add_time))
1056 *best = x;
1057 } else if (x->km.state == XFRM_STATE_ACQ) {
1058 *acq_in_progress = 1;
1059 } else if (x->km.state == XFRM_STATE_ERROR ||
1060 x->km.state == XFRM_STATE_EXPIRED) {
e94ee171
HX		 1061 if ((!x->sel.family ||
1062 (x->sel.family == family &&
1063 xfrm_selector_match(&x->sel, fl, family))) &&
3df98d79
PM		 1064 security_xfrm_state_pol_flow_match(x, pol,
1065 &fl->u.__fl_common))
08ec9af1
DM		 1066 *error = -ESRCH;
1067 }
1068}
1069
1da177e4 1070struct xfrm_state *
33765d06 1071xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
b520e9f6 1072 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1da177e4 1073 struct xfrm_policy *pol, int *err,
bc56b334 1074 unsigned short family, u32 if_id)
1da177e4 1075{
08ec9af1 1076 static xfrm_address_t saddr_wildcard = { };
5447c5e4 1077 struct net *net = xp_net(pol);
6a783c90 1078 unsigned int h, h_wildcard;
37b08e34 1079 struct xfrm_state *x, *x0, *to_put;
1da177e4
LT		 1080 int acquire_in_progress = 0;
1081 int error = 0;
1082 struct xfrm_state *best = NULL;
bd55775c 1083 u32 mark = pol->mark.v & pol->mark.m;
8444cf71 1084 unsigned short encap_family = tmpl->encap_family;
b65e3d7b 1085 unsigned int sequence;
0f24558e 1086 struct km_event c;
a716c119 1087
37b08e34
DM		 1088 to_put = NULL;
1089
e88add19 1090 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
b65e3d7b 1091
d737a580 1092 rcu_read_lock();
8444cf71 1093 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
ae3fb6d3 1094 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
8444cf71 1095 if (x->props.family == encap_family &&
1da177e4 1096 x->props.reqid == tmpl->reqid &&
3d6acfa7 1097 (mark & x->mark.m) == x->mark.v &&
7e652640 1098 x->if_id == if_id &&
fbd9a5b4 1099 !(x->props.flags & XFRM_STATE_WILDRECV) &&
8444cf71 1100 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1da177e4
LT		 1101 tmpl->mode == x->props.mode &&
1102 tmpl->id.proto == x->id.proto &&
08ec9af1 1103 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
e94ee171 1104 xfrm_state_look_at(pol, x, fl, family,
08ec9af1
DM		 1105 &best, &acquire_in_progress, &error);
1106 }
6f115638 1107 if (best || acquire_in_progress)
08ec9af1
DM		 1108 goto found;
1109
8444cf71 1110 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
ae3fb6d3 1111 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
8444cf71 1112 if (x->props.family == encap_family &&
08ec9af1 1113 x->props.reqid == tmpl->reqid &&
3d6acfa7 1114 (mark & x->mark.m) == x->mark.v &&
7e652640 1115 x->if_id == if_id &&
08ec9af1 1116 !(x->props.flags & XFRM_STATE_WILDRECV) &&
f59bbdfa 1117 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
08ec9af1
DM		 1118 tmpl->mode == x->props.mode &&
1119 tmpl->id.proto == x->id.proto &&
1120 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
e94ee171 1121 xfrm_state_look_at(pol, x, fl, family,
08ec9af1 1122 &best, &acquire_in_progress, &error);
1da177e4
LT		 1123 }
1124
08ec9af1 1125found:
1da177e4
LT		 1126 x = best;
1127 if (!x && !error && !acquire_in_progress) {
5c5d281a 1128 if (tmpl->id.spi &&
bd55775c 1129 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
8444cf71 1130 tmpl->id.proto, encap_family)) != NULL) {
37b08e34 1131 to_put = x0;
1da177e4
LT		 1132 error = -EEXIST;
1133 goto out;
1134 }
0f24558e
HG		 1135
1136 c.net = net;
1137 /* If the KMs have no listeners (yet...), avoid allocating an SA
1138 * for each and every packet - garbage collection might not
1139 * handle the flood.
1140 */
1141 if (!km_is_alive(&c)) {
1142 error = -ESRCH;
1143 goto out;
1144 }
1145
5447c5e4 1146 x = xfrm_state_alloc(net);
1da177e4
LT		 1147 if (x == NULL) {
1148 error = -ENOMEM;
1149 goto out;
1150 }
8444cf71 1151 /* Initialize temporary state matching only
1da177e4 1152 * to current session. */
8444cf71 1153 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
bd55775c 1154 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
7e652640 1155 x->if_id = if_id;
1da177e4 1156
1d28f42c 1157 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
e0d1caa7
VY		 1158 if (error) {
1159 x->km.state = XFRM_STATE_DEAD;
37b08e34 1160 to_put = x;
e0d1caa7
VY		 1161 x = NULL;
1162 goto out;
1163 }
1164
1da177e4 1165 if (km_query(x, tmpl, pol) == 0) {
d737a580 1166 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1167 x->km.state = XFRM_STATE_ACQ;
5447c5e4 1168 list_add(&x->km.all, &net->xfrm.state_all);
ae3fb6d3 1169 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
8444cf71 1170 h = xfrm_src_hash(net, daddr, saddr, encap_family);
ae3fb6d3 1171 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1da177e4 1172 if (x->id.spi) {
8444cf71 1173 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
ae3fb6d3 1174 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1da177e4 1175 }
fe9f1d87
SD		 1176 if (x->km.seq) {
1177 h = xfrm_seq_hash(net, x->km.seq);
1178 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1179 }
b27aeadb 1180 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
671422b2
TG		 1181 hrtimer_start(&x->mtimer,
1182 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1183 HRTIMER_MODE_REL_SOFT);
5447c5e4
AD		 1184 net->xfrm.state_num++;
1185 xfrm_hash_grow_check(net, x->bydst.next != NULL);
d737a580 1186 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 1187 } else {
1188 x->km.state = XFRM_STATE_DEAD;
37b08e34 1189 to_put = x;
1da177e4
LT		 1190 x = NULL;
1191 error = -ESRCH;
1192 }
1193 }
1194out:
02efdff7
FW		 1195 if (x) {
1196 if (!xfrm_state_hold_rcu(x)) {
1197 *err = -EAGAIN;
1198 x = NULL;
1199 }
1200 } else {
1da177e4 1201 *err = acquire_in_progress ? -EAGAIN : error;
02efdff7 1202 }
d737a580 1203 rcu_read_unlock();
37b08e34
DM		 1204 if (to_put)
1205 xfrm_state_put(to_put);
b65e3d7b 1206
e88add19 1207 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
b65e3d7b
FW		 1208 *err = -EAGAIN;
1209 if (x) {
1210 xfrm_state_put(x);
1211 x = NULL;
1212 }
1213 }
1214
1da177e4
LT		 1215 return x;
1216}
1217
628529b6 1218struct xfrm_state *
7e652640 1219xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
5447c5e4 1220 xfrm_address_t *daddr, xfrm_address_t *saddr,
628529b6
JHS		 1221 unsigned short family, u8 mode, u8 proto, u32 reqid)
1222{
4bda4f25 1223 unsigned int h;
628529b6 1224 struct xfrm_state *rx = NULL, *x = NULL;
628529b6 1225
4ae770bf 1226 spin_lock_bh(&net->xfrm.xfrm_state_lock);
5447c5e4 1227 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
b67bfe0d 1228 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
628529b6
JHS		 1229 if (x->props.family == family &&
1230 x->props.reqid == reqid &&
3d6acfa7 1231 (mark & x->mark.m) == x->mark.v &&
7e652640 1232 x->if_id == if_id &&
628529b6
JHS		 1233 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1234 xfrm_state_addr_check(x, daddr, saddr, family) &&
1235 mode == x->props.mode &&
1236 proto == x->id.proto &&
1237 x->km.state == XFRM_STATE_VALID) {
1238 rx = x;
1239 break;
1240 }
1241 }
1242
1243 if (rx)
1244 xfrm_state_hold(rx);
4ae770bf 1245 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
628529b6
JHS		 1246
1247
1248 return rx;
1249}
1250EXPORT_SYMBOL(xfrm_stateonly_find);
1251
c454997e
FD		 1252struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1253 unsigned short family)
1254{
1255 struct xfrm_state *x;
1256 struct xfrm_state_walk *w;
1257
1258 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1259 list_for_each_entry(w, &net->xfrm.state_all, all) {
1260 x = container_of(w, struct xfrm_state, km);
1261 if (x->props.family != family ||
1262 x->id.spi != spi)
1263 continue;
1264
c454997e 1265 xfrm_state_hold(x);
bdddbf69 1266 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
c454997e
FD		 1267 return x;
1268 }
1269 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1270 return NULL;
1271}
1272EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1273
1da177e4
LT		 1274static void __xfrm_state_insert(struct xfrm_state *x)
1275{
98806f75 1276 struct net *net = xs_net(x);
a624c108 1277 unsigned int h;
1da177e4 1278
98806f75 1279 list_add(&x->km.all, &net->xfrm.state_all);
4c563f76 1280
98806f75 1281 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
c1969f29 1282 x->props.reqid, x->props.family);
ae3fb6d3 1283 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1da177e4 1284
98806f75 1285 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
ae3fb6d3 1286 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1da177e4 1287
7b4dc360 1288 if (x->id.spi) {
98806f75 1289 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
6c44e6b7
MN		 1290 x->props.family);
1291
ae3fb6d3 1292 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
6c44e6b7
MN		 1293 }
1294
fe9f1d87
SD		 1295 if (x->km.seq) {
1296 h = xfrm_seq_hash(net, x->km.seq);
1297
1298 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1299 }
1300
671422b2 1301 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
a47f0ce0
DM		 1302 if (x->replay_maxage)
1303 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
f8cd5488 1304
98806f75 1305 net->xfrm.state_num++;
f034b5d4 1306
98806f75 1307 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1da177e4
LT		 1308}
1309
283bc9f3 1310/* net->xfrm.xfrm_state_lock is held */
c7f5ea3a
DM		 1311static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1312{
98806f75 1313 struct net *net = xs_net(xnew);
c7f5ea3a
DM		 1314 unsigned short family = xnew->props.family;
1315 u32 reqid = xnew->props.reqid;
1316 struct xfrm_state *x;
c7f5ea3a 1317 unsigned int h;
3d6acfa7 1318 u32 mark = xnew->mark.v & xnew->mark.m;
7e652640 1319 u32 if_id = xnew->if_id;
c7f5ea3a 1320
98806f75 1321 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
b67bfe0d 1322 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
c7f5ea3a
DM		 1323 if (x->props.family == family &&
1324 x->props.reqid == reqid &&
7e652640 1325 x->if_id == if_id &&
3d6acfa7 1326 (mark & x->mark.m) == x->mark.v &&
70e94e66
YH		 1327 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1328 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
34996cb9 1329 x->genid++;
c7f5ea3a
DM		 1330 }
1331}
1332
1da177e4
LT		 1333void xfrm_state_insert(struct xfrm_state *x)
1334{
283bc9f3
FD		 1335 struct net *net = xs_net(x);
1336
1337 spin_lock_bh(&net->xfrm.xfrm_state_lock);
c7f5ea3a 1338 __xfrm_state_bump_genids(x);
1da177e4 1339 __xfrm_state_insert(x);
283bc9f3 1340 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 1341}
1342EXPORT_SYMBOL(xfrm_state_insert);
1343
283bc9f3 1344/* net->xfrm.xfrm_state_lock is held */
e473fcb4
MK		 1345static struct xfrm_state *__find_acq_core(struct net *net,
1346 const struct xfrm_mark *m,
a70486f0 1347 unsigned short family, u8 mode,
7e652640 1348 u32 reqid, u32 if_id, u8 proto,
a70486f0 1349 const xfrm_address_t *daddr,
e473fcb4
MK		 1350 const xfrm_address_t *saddr,
1351 int create)
2770834c 1352{
5447c5e4 1353 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
2770834c 1354 struct xfrm_state *x;
3d6acfa7 1355 u32 mark = m->v & m->m;
2770834c 1356
b67bfe0d 1357 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
2770834c
DM		 1358 if (x->props.reqid != reqid ||
1359 x->props.mode != mode ||
1360 x->props.family != family ||
1361 x->km.state != XFRM_STATE_ACQ ||
75e252d9 1362 x->id.spi != 0 ||
1802571b 1363 x->id.proto != proto ||
3d6acfa7 1364 (mark & x->mark.m) != x->mark.v ||
70e94e66
YH		 1365 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1366 !xfrm_addr_equal(&x->props.saddr, saddr, family))
2770834c
DM		 1367 continue;
1368
2770834c
DM		 1369 xfrm_state_hold(x);
1370 return x;
1371 }
1372
1373 if (!create)
1374 return NULL;
1375
5447c5e4 1376 x = xfrm_state_alloc(net);
2770834c
DM		 1377 if (likely(x)) {
1378 switch (family) {
1379 case AF_INET:
1380 x->sel.daddr.a4 = daddr->a4;
1381 x->sel.saddr.a4 = saddr->a4;
1382 x->sel.prefixlen_d = 32;
1383 x->sel.prefixlen_s = 32;
1384 x->props.saddr.a4 = saddr->a4;
1385 x->id.daddr.a4 = daddr->a4;
1386 break;
1387
1388 case AF_INET6:
15e318bd
JB		 1389 x->sel.daddr.in6 = daddr->in6;
1390 x->sel.saddr.in6 = saddr->in6;
2770834c
DM		 1391 x->sel.prefixlen_d = 128;
1392 x->sel.prefixlen_s = 128;
15e318bd
JB		 1393 x->props.saddr.in6 = saddr->in6;
1394 x->id.daddr.in6 = daddr->in6;
2770834c 1395 break;
3ff50b79 1396 }
2770834c
DM		 1397
1398 x->km.state = XFRM_STATE_ACQ;
1399 x->id.proto = proto;
1400 x->props.family = family;
1401 x->props.mode = mode;
1402 x->props.reqid = reqid;
7e652640 1403 x->if_id = if_id;
bd55775c
JHS		 1404 x->mark.v = m->v;
1405 x->mark.m = m->m;
b27aeadb 1406 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
2770834c 1407 xfrm_state_hold(x);
671422b2
TG		 1408 hrtimer_start(&x->mtimer,
1409 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1410 HRTIMER_MODE_REL_SOFT);
5447c5e4 1411 list_add(&x->km.all, &net->xfrm.state_all);
ae3fb6d3 1412 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
5447c5e4 1413 h = xfrm_src_hash(net, daddr, saddr, family);
ae3fb6d3 1414 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
918049f0 1415
5447c5e4 1416 net->xfrm.state_num++;
918049f0 1417
5447c5e4 1418 xfrm_hash_grow_check(net, x->bydst.next != NULL);
2770834c
DM		 1419 }
1420
1421 return x;
1422}
1423
bd55775c 1424static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1da177e4
LT		 1425
1426int xfrm_state_add(struct xfrm_state *x)
1427{
5447c5e4 1428 struct net *net = xs_net(x);
37b08e34 1429 struct xfrm_state *x1, *to_put;
1da177e4
LT		 1430 int family;
1431 int err;
bd55775c 1432 u32 mark = x->mark.v & x->mark.m;
eb2971b6 1433 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1da177e4
LT		 1434
1435 family = x->props.family;
1da177e4 1436
37b08e34
DM		 1437 to_put = NULL;
1438
283bc9f3 1439 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1440
edcd5821 1441 x1 = __xfrm_state_locate(x, use_spi, family);
1da177e4 1442 if (x1) {
37b08e34 1443 to_put = x1;
1da177e4
LT		 1444 x1 = NULL;
1445 err = -EEXIST;
1446 goto out;
1447 }
1448
eb2971b6 1449 if (use_spi && x->km.seq) {
bd55775c 1450 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
75e252d9 1451 if (x1 && ((x1->id.proto != x->id.proto) ||
70e94e66 1452 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
37b08e34 1453 to_put = x1;
1da177e4
LT		 1454 x1 = NULL;
1455 }
1456 }
1457
eb2971b6 1458 if (use_spi && !x1)
bd55775c 1459 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
7e652640 1460 x->props.reqid, x->if_id, x->id.proto,
2770834c 1461 &x->id.daddr, &x->props.saddr, 0);
1da177e4 1462
c7f5ea3a 1463 __xfrm_state_bump_genids(x);
1da177e4
LT		 1464 __xfrm_state_insert(x);
1465 err = 0;
1466
1467out:
283bc9f3 1468 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 1469
1470 if (x1) {
1471 xfrm_state_delete(x1);
1472 xfrm_state_put(x1);
1473 }
1474
37b08e34
DM		 1475 if (to_put)
1476 xfrm_state_put(to_put);
1477
1da177e4
LT		 1478 return err;
1479}
1480EXPORT_SYMBOL(xfrm_state_add);
1481
80c9abaa 1482#ifdef CONFIG_XFRM_MIGRATE
7aa05d30
AA		 1483static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1484{
1485 struct xfrm_user_sec_ctx *uctx;
1486 int size = sizeof(*uctx) + security->ctx_len;
1487 int err;
1488
1489 uctx = kmalloc(size, GFP_KERNEL);
1490 if (!uctx)
1491 return -ENOMEM;
1492
1493 uctx->exttype = XFRMA_SEC_CTX;
1494 uctx->len = size;
1495 uctx->ctx_doi = security->ctx_doi;
1496 uctx->ctx_alg = security->ctx_alg;
1497 uctx->ctx_len = security->ctx_len;
1498 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1499 err = security_xfrm_state_alloc(x, uctx);
1500 kfree(uctx);
1501 if (err)
1502 return err;
1503
1504 return 0;
1505}
1506
4ab47d47
AA		 1507static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1508 struct xfrm_encap_tmpl *encap)
80c9abaa 1509{
98806f75 1510 struct net *net = xs_net(orig);
98806f75 1511 struct xfrm_state *x = xfrm_state_alloc(net);
80c9abaa 1512 if (!x)
553f9118 1513 goto out;
80c9abaa
SS		 1514
1515 memcpy(&x->id, &orig->id, sizeof(x->id));
1516 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1517 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1518 x->props.mode = orig->props.mode;
1519 x->props.replay_window = orig->props.replay_window;
1520 x->props.reqid = orig->props.reqid;
1521 x->props.family = orig->props.family;
1522 x->props.saddr = orig->props.saddr;
1523
1524 if (orig->aalg) {
4447bb33 1525 x->aalg = xfrm_algo_auth_clone(orig->aalg);
80c9abaa
SS		 1526 if (!x->aalg)
1527 goto error;
1528 }
1529 x->props.aalgo = orig->props.aalgo;
1530
ee5c2317
SK		 1531 if (orig->aead) {
1532 x->aead = xfrm_algo_aead_clone(orig->aead);
75bf50f4 1533 x->geniv = orig->geniv;
ee5c2317
SK		 1534 if (!x->aead)
1535 goto error;
1536 }
80c9abaa
SS		 1537 if (orig->ealg) {
1538 x->ealg = xfrm_algo_clone(orig->ealg);
1539 if (!x->ealg)
1540 goto error;
1541 }
1542 x->props.ealgo = orig->props.ealgo;
1543
1544 if (orig->calg) {
1545 x->calg = xfrm_algo_clone(orig->calg);
1546 if (!x->calg)
1547 goto error;
1548 }
1549 x->props.calgo = orig->props.calgo;
1550
4ab47d47
AA		 1551 if (encap || orig->encap) {
1552 if (encap)
1553 x->encap = kmemdup(encap, sizeof(*x->encap),
1554 GFP_KERNEL);
1555 else
1556 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1557 GFP_KERNEL);
1558
80c9abaa
SS		 1559 if (!x->encap)
1560 goto error;
1561 }
1562
7aa05d30
AA		 1563 if (orig->security)
1564 if (clone_security(x, orig->security))
1565 goto error;
1566
80c9abaa
SS		 1567 if (orig->coaddr) {
1568 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1569 GFP_KERNEL);
1570 if (!x->coaddr)
1571 goto error;
1572 }
1573
af2f464e 1574 if (orig->replay_esn) {
cc9ab60e 1575 if (xfrm_replay_clone(x, orig))
af2f464e
SK		 1576 goto error;
1577 }
1578
bd55775c 1579 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
545e5c57 1580 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
bd55775c 1581
80c9abaa 1582 x->props.flags = orig->props.flags;
a947b0a9 1583 x->props.extra_flags = orig->props.extra_flags;
80c9abaa 1584
7e652640 1585 x->if_id = orig->if_id;
ee5c2317
SK		 1586 x->tfcpad = orig->tfcpad;
1587 x->replay_maxdiff = orig->replay_maxdiff;
1588 x->replay_maxage = orig->replay_maxage;
8366685b 1589 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
80c9abaa
SS		 1590 x->km.state = orig->km.state;
1591 x->km.seq = orig->km.seq;
a486cd23
AA		 1592 x->replay = orig->replay;
1593 x->preplay = orig->preplay;
4e484b3e 1594 x->mapping_maxage = orig->mapping_maxage;
6aa811ac 1595 x->lastused = orig->lastused;
4e484b3e
AA		 1596 x->new_mapping = 0;
1597 x->new_mapping_sport = 0;
80c9abaa
SS		 1598
1599 return x;
1600
1601 error:
553f9118
HX		 1602 xfrm_state_put(x);
1603out:
80c9abaa
SS		 1604 return NULL;
1605}
80c9abaa 1606
c1aca308
YY		 1607struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1608 u32 if_id)
80c9abaa
SS		 1609{
1610 unsigned int h;
8c0cba22
SK		 1611 struct xfrm_state *x = NULL;
1612
1613 spin_lock_bh(&net->xfrm.xfrm_state_lock);
80c9abaa
SS		 1614
1615 if (m->reqid) {
283bc9f3 1616 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
80c9abaa 1617 m->reqid, m->old_family);
283bc9f3 1618 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
80c9abaa
SS		 1619 if (x->props.mode != m->mode ||
1620 x->id.proto != m->proto)
1621 continue;
1622 if (m->reqid && x->props.reqid != m->reqid)
1623 continue;
c1aca308
YY		 1624 if (if_id != 0 && x->if_id != if_id)
1625 continue;
70e94e66
YH		 1626 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1627 m->old_family) ||
1628 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1629 m->old_family))
80c9abaa
SS		 1630 continue;
1631 xfrm_state_hold(x);
8c0cba22 1632 break;
80c9abaa
SS		 1633 }
1634 } else {
283bc9f3 1635 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
80c9abaa 1636 m->old_family);
283bc9f3 1637 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
80c9abaa
SS		 1638 if (x->props.mode != m->mode ||
1639 x->id.proto != m->proto)
1640 continue;
c1aca308
YY		 1641 if (if_id != 0 && x->if_id != if_id)
1642 continue;
70e94e66
YH		 1643 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1644 m->old_family) ||
1645 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1646 m->old_family))
80c9abaa
SS		 1647 continue;
1648 xfrm_state_hold(x);
8c0cba22 1649 break;
80c9abaa
SS		 1650 }
1651 }
1652
8c0cba22
SK		 1653 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1654
1655 return x;
80c9abaa
SS		 1656}
1657EXPORT_SYMBOL(xfrm_migrate_state_find);
1658
3e94c2dc 1659struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
4ab47d47
AA		 1660 struct xfrm_migrate *m,
1661 struct xfrm_encap_tmpl *encap)
80c9abaa
SS		 1662{
1663 struct xfrm_state *xc;
80c9abaa 1664
4ab47d47 1665 xc = xfrm_state_clone(x, encap);
80c9abaa
SS		 1666 if (!xc)
1667 return NULL;
1668
e03c3bba
YY		 1669 xc->props.family = m->new_family;
1670
1671 if (xfrm_init_state(xc) < 0)
1672 goto error;
1673
80c9abaa
SS		 1674 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1675 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1676
1677 /* add state */
70e94e66 1678 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
80c9abaa
SS		 1679 /* a care is needed when the destination address of the
1680 state is to be updated as it is a part of triplet */
1681 xfrm_state_insert(xc);
1682 } else {
cc9ab60e 1683 if (xfrm_state_add(xc) < 0)
80c9abaa
SS		 1684 goto error;
1685 }
1686
1687 return xc;
1688error:
78347c8c 1689 xfrm_state_put(xc);
80c9abaa
SS		 1690 return NULL;
1691}
1692EXPORT_SYMBOL(xfrm_state_migrate);
1693#endif
1694
1da177e4
LT		 1695int xfrm_state_update(struct xfrm_state *x)
1696{
37b08e34 1697 struct xfrm_state *x1, *to_put;
1da177e4 1698 int err;
eb2971b6 1699 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
283bc9f3 1700 struct net *net = xs_net(x);
1da177e4 1701
37b08e34
DM		 1702 to_put = NULL;
1703
283bc9f3 1704 spin_lock_bh(&net->xfrm.xfrm_state_lock);
edcd5821 1705 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1da177e4
LT		 1706
1707 err = -ESRCH;
1708 if (!x1)
1709 goto out;
1710
1711 if (xfrm_state_kern(x1)) {
37b08e34 1712 to_put = x1;
1da177e4
LT		 1713 err = -EEXIST;
1714 goto out;
1715 }
1716
1717 if (x1->km.state == XFRM_STATE_ACQ) {
1718 __xfrm_state_insert(x);
1719 x = NULL;
1720 }
1721 err = 0;
1722
1723out:
283bc9f3 1724 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1725
37b08e34
DM		 1726 if (to_put)
1727 xfrm_state_put(to_put);
1728
1da177e4
LT		 1729 if (err)
1730 return err;
1731
1732 if (!x) {
1733 xfrm_state_delete(x1);
1734 xfrm_state_put(x1);
1735 return 0;
1736 }
1737
1738 err = -EINVAL;
1739 spin_lock_bh(&x1->lock);
1740 if (likely(x1->km.state == XFRM_STATE_VALID)) {
257a4b01
HX		 1741 if (x->encap && x1->encap &&
1742 x->encap->encap_type == x1->encap->encap_type)
1da177e4 1743 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
257a4b01
HX		 1744 else if (x->encap || x1->encap)
1745 goto fail;
1746
060f02a3
NT		 1747 if (x->coaddr && x1->coaddr) {
1748 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1749 }
1750 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1751 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1da177e4
LT		 1752 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1753 x1->km.dying = 0;
1754
671422b2
TG		 1755 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1756 HRTIMER_MODE_REL_SOFT);
1da177e4
LT		 1757 if (x1->curlft.use_time)
1758 xfrm_state_check_expire(x1);
1759
5baf4f9c 1760 if (x->props.smark.m || x->props.smark.v || x->if_id) {
6d8e85ff
NH		 1761 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1762
5baf4f9c
NH		 1763 if (x->props.smark.m || x->props.smark.v)
1764 x1->props.smark = x->props.smark;
1765
1766 if (x->if_id)
1767 x1->if_id = x->if_id;
6d8e85ff
NH		 1768
1769 __xfrm_state_bump_genids(x1);
1770 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1771 }
1772
1da177e4 1773 err = 0;
8fcbc637
TG		 1774 x->km.state = XFRM_STATE_DEAD;
1775 __xfrm_state_put(x);
1da177e4 1776 }
257a4b01
HX		 1777
1778fail:
1da177e4
LT		 1779 spin_unlock_bh(&x1->lock);
1780
1781 xfrm_state_put(x1);
1782
1783 return err;
1784}
1785EXPORT_SYMBOL(xfrm_state_update);
1786
1787int xfrm_state_check_expire(struct xfrm_state *x)
1788{
1789 if (!x->curlft.use_time)
386c5680 1790 x->curlft.use_time = ktime_get_real_seconds();
1da177e4 1791
1da177e4
LT		 1792 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1793 x->curlft.packets >= x->lft.hard_packet_limit) {
4666faab 1794 x->km.state = XFRM_STATE_EXPIRED;
671422b2 1795 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1da177e4
LT		 1796 return -EINVAL;
1797 }
1798
1799 if (!x->km.dying &&
1800 (x->curlft.bytes >= x->lft.soft_byte_limit ||
4666faab
HX		 1801 x->curlft.packets >= x->lft.soft_packet_limit)) {
1802 x->km.dying = 1;
53bc6b4d 1803 km_state_expired(x, 0, 0);
4666faab 1804 }
1da177e4
LT		 1805 return 0;
1806}
1807EXPORT_SYMBOL(xfrm_state_check_expire);
1808
1da177e4 1809struct xfrm_state *
a70486f0 1810xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
bd55775c 1811 u8 proto, unsigned short family)
1da177e4
LT		 1812{
1813 struct xfrm_state *x;
1da177e4 1814
c2f672fc 1815 rcu_read_lock();
bd55775c 1816 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
c2f672fc 1817 rcu_read_unlock();
1da177e4
LT		 1818 return x;
1819}
1820EXPORT_SYMBOL(xfrm_state_lookup);
1821
1822struct xfrm_state *
bd55775c 1823xfrm_state_lookup_byaddr(struct net *net, u32 mark,
a70486f0 1824 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
eb2971b6
MN		 1825 u8 proto, unsigned short family)
1826{
1827 struct xfrm_state *x;
eb2971b6 1828
283bc9f3 1829 spin_lock_bh(&net->xfrm.xfrm_state_lock);
bd55775c 1830 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
283bc9f3 1831 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
eb2971b6
MN		 1832 return x;
1833}
1834EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1835
1836struct xfrm_state *
e473fcb4 1837xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
7e652640 1838 u32 if_id, u8 proto, const xfrm_address_t *daddr,
e473fcb4 1839 const xfrm_address_t *saddr, int create, unsigned short family)
1da177e4
LT		 1840{
1841 struct xfrm_state *x;
1da177e4 1842
283bc9f3 1843 spin_lock_bh(&net->xfrm.xfrm_state_lock);
7e652640 1844 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
283bc9f3 1845 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2770834c 1846
1da177e4
LT		 1847 return x;
1848}
1849EXPORT_SYMBOL(xfrm_find_acq);
1850
41a49cc3 1851#ifdef CONFIG_XFRM_SUB_POLICY
3aaf3915
FW		 1852#if IS_ENABLED(CONFIG_IPV6)
1853/* distribution counting sort function for xfrm_state and xfrm_tmpl */
1854static void
1855__xfrm6_sort(void **dst, void **src, int n,
1856 int (*cmp)(const void *p), int maxclass)
1857{
1858 int count[XFRM_MAX_DEPTH] = { };
1859 int class[XFRM_MAX_DEPTH];
1860 int i;
1861
1862 for (i = 0; i < n; i++) {
1863 int c = cmp(src[i]);
1864
1865 class[i] = c;
1866 count[c]++;
1867 }
1868
1869 for (i = 2; i < maxclass; i++)
1870 count[i] += count[i - 1];
1871
1872 for (i = 0; i < n; i++) {
1873 dst[count[class[i] - 1]++] = src[i];
1874 src[i] = NULL;
1875 }
1876}
1877
1878/* Rule for xfrm_state:
1879 *
1880 * rule 1: select IPsec transport except AH
1881 * rule 2: select MIPv6 RO or inbound trigger
1882 * rule 3: select IPsec transport AH
1883 * rule 4: select IPsec tunnel
1884 * rule 5: others
1885 */
1886static int __xfrm6_state_sort_cmp(const void *p)
1887{
1888 const struct xfrm_state *v = p;
1889
1890 switch (v->props.mode) {
1891 case XFRM_MODE_TRANSPORT:
1892 if (v->id.proto != IPPROTO_AH)
1893 return 1;
1894 else
1895 return 3;
1896#if IS_ENABLED(CONFIG_IPV6_MIP6)
1897 case XFRM_MODE_ROUTEOPTIMIZATION:
1898 case XFRM_MODE_IN_TRIGGER:
1899 return 2;
1900#endif
1901 case XFRM_MODE_TUNNEL:
1902 case XFRM_MODE_BEET:
1903 return 4;
1904 }
1905 return 5;
1906}
1907
1908/* Rule for xfrm_tmpl:
1909 *
1910 * rule 1: select IPsec transport
1911 * rule 2: select MIPv6 RO or inbound trigger
1912 * rule 3: select IPsec tunnel
1913 * rule 4: others
1914 */
1915static int __xfrm6_tmpl_sort_cmp(const void *p)
1916{
1917 const struct xfrm_tmpl *v = p;
1918
1919 switch (v->mode) {
1920 case XFRM_MODE_TRANSPORT:
1921 return 1;
1922#if IS_ENABLED(CONFIG_IPV6_MIP6)
1923 case XFRM_MODE_ROUTEOPTIMIZATION:
1924 case XFRM_MODE_IN_TRIGGER:
1925 return 2;
1926#endif
1927 case XFRM_MODE_TUNNEL:
1928 case XFRM_MODE_BEET:
1929 return 3;
1930 }
1931 return 4;
1932}
1933#else
1934static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1935static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1936
1937static inline void
1938__xfrm6_sort(void **dst, void **src, int n,
1939 int (*cmp)(const void *p), int maxclass)
1940{
1941 int i;
1942
1943 for (i = 0; i < n; i++)
1944 dst[i] = src[i];
1945}
1946#endif /* CONFIG_IPV6 */
1947
1948void
41a49cc3 1949xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
3aaf3915 1950 unsigned short family)
41a49cc3 1951{
3f5a95ad 1952 int i;
41a49cc3 1953
3aaf3915
FW		 1954 if (family == AF_INET6)
1955 __xfrm6_sort((void **)dst, (void **)src, n,
1956 __xfrm6_tmpl_sort_cmp, 5);
3f5a95ad
KD		 1957 else
1958 for (i = 0; i < n; i++)
1959 dst[i] = src[i];
41a49cc3 1960}
41a49cc3 1961
3aaf3915 1962void
41a49cc3
MN		 1963xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1964 unsigned short family)
1965{
3f5a95ad 1966 int i;
283bc9f3 1967
3aaf3915
FW		 1968 if (family == AF_INET6)
1969 __xfrm6_sort((void **)dst, (void **)src, n,
1970 __xfrm6_state_sort_cmp, 6);
3f5a95ad
KD		 1971 else
1972 for (i = 0; i < n; i++)
1973 dst[i] = src[i];
41a49cc3 1974}
41a49cc3
MN		 1975#endif
1976
1da177e4
LT		 1977/* Silly enough, but I'm lazy to build resolution list */
1978
bd55775c 1979static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1da177e4 1980{
fe9f1d87
SD		 1981 unsigned int h = xfrm_seq_hash(net, seq);
1982 struct xfrm_state *x;
8f126e37 1983
fe9f1d87
SD		 1984 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
1985 if (x->km.seq == seq &&
1986 (mark & x->mark.m) == x->mark.v &&
1987 x->km.state == XFRM_STATE_ACQ) {
1988 xfrm_state_hold(x);
1989 return x;
1da177e4
LT		 1990 }
1991 }
fe9f1d87 1992
1da177e4
LT		 1993 return NULL;
1994}
1995
bd55775c 1996struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1da177e4
LT		 1997{
1998 struct xfrm_state *x;
1999
283bc9f3 2000 spin_lock_bh(&net->xfrm.xfrm_state_lock);
bd55775c 2001 x = __xfrm_find_acq_byseq(net, mark, seq);
283bc9f3 2002 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 2003 return x;
2004}
2005EXPORT_SYMBOL(xfrm_find_acq_byseq);
2006
2007u32 xfrm_get_acqseq(void)
2008{
2009 u32 res;
6836b9bd 2010 static atomic_t acqseq;
2011
2012 do {
2013 res = atomic_inc_return(&acqseq);
2014 } while (!res);
1da177e4 2015
1da177e4
LT		 2016 return res;
2017}
2018EXPORT_SYMBOL(xfrm_get_acqseq);
2019
776e9dd9
FD		 2020int verify_spi_info(u8 proto, u32 min, u32 max)
2021{
2022 switch (proto) {
2023 case IPPROTO_AH:
2024 case IPPROTO_ESP:
2025 break;
2026
2027 case IPPROTO_COMP:
2028 /* IPCOMP spi is 16-bits. */
2029 if (max >= 0x10000)
2030 return -EINVAL;
2031 break;
2032
2033 default:
2034 return -EINVAL;
2035 }
2036
2037 if (min > max)
2038 return -EINVAL;
2039
2040 return 0;
2041}
2042EXPORT_SYMBOL(verify_spi_info);
2043
658b219e 2044int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1da177e4 2045{
221df1ed 2046 struct net *net = xs_net(x);
f034b5d4 2047 unsigned int h;
1da177e4 2048 struct xfrm_state *x0;
658b219e
HX		 2049 int err = -ENOENT;
2050 __be32 minspi = htonl(low);
2051 __be32 maxspi = htonl(high);
a779d913 2052 __be32 newspi = 0;
bd55775c 2053 u32 mark = x->mark.v & x->mark.m;
1da177e4 2054
658b219e
HX		 2055 spin_lock_bh(&x->lock);
2056 if (x->km.state == XFRM_STATE_DEAD)
2057 goto unlock;
2058
2059 err = 0;
1da177e4 2060 if (x->id.spi)
658b219e
HX		 2061 goto unlock;
2062
2063 err = -ENOENT;
1da177e4
LT		 2064
2065 if (minspi == maxspi) {
bd55775c 2066 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1da177e4
LT		 2067 if (x0) {
2068 xfrm_state_put(x0);
658b219e 2069 goto unlock;
1da177e4 2070 }
a779d913 2071 newspi = minspi;
1da177e4
LT		 2072 } else {
2073 u32 spi = 0;
9b7a787d 2074 for (h = 0; h < high-low+1; h++) {
8032bf12 2075 spi = low + get_random_u32_below(high - low + 1);
bd55775c 2076 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1da177e4 2077 if (x0 == NULL) {
a779d913 2078 newspi = htonl(spi);
1da177e4
LT		 2079 break;
2080 }
2081 xfrm_state_put(x0);
2082 }
2083 }
a779d913 2084 if (newspi) {
283bc9f3 2085 spin_lock_bh(&net->xfrm.xfrm_state_lock);
a779d913 2086 x->id.spi = newspi;
12604d8a 2087 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
ae3fb6d3 2088 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
283bc9f3 2089 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
658b219e
HX		 2090
2091 err = 0;
1da177e4 2092 }
658b219e
HX		 2093
2094unlock:
2095 spin_unlock_bh(&x->lock);
2096
2097 return err;
1da177e4
LT		 2098}
2099EXPORT_SYMBOL(xfrm_alloc_spi);
2100
d3623099 2101static bool __xfrm_state_filter_match(struct xfrm_state *x,
870a2df4 2102 struct xfrm_address_filter *filter)
d3623099
ND		 2103{
2104 if (filter) {
2105 if ((filter->family == AF_INET ||
2106 filter->family == AF_INET6) &&
2107 x->props.family != filter->family)
2108 return false;
2109
2110 return addr_match(&x->props.saddr, &filter->saddr,
2111 filter->splen) &&
2112 addr_match(&x->id.daddr, &filter->daddr,
2113 filter->dplen);
2114 }
2115 return true;
2116}
2117
284fa7da 2118int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
4c563f76 2119 int (*func)(struct xfrm_state *, int, void*),
1da177e4
LT		 2120 void *data)
2121{
12a169e7
HX		 2122 struct xfrm_state *state;
2123 struct xfrm_state_walk *x;
1da177e4
LT		 2124 int err = 0;
2125
12a169e7 2126 if (walk->seq != 0 && list_empty(&walk->all))
4c563f76
TT		 2127 return 0;
2128
283bc9f3 2129 spin_lock_bh(&net->xfrm.xfrm_state_lock);
12a169e7 2130 if (list_empty(&walk->all))
284fa7da 2131 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
12a169e7 2132 else
80077702 2133 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
284fa7da 2134 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
12a169e7 2135 if (x->state == XFRM_STATE_DEAD)
4c563f76 2136 continue;
12a169e7
HX		 2137 state = container_of(x, struct xfrm_state, km);
2138 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
4c563f76 2139 continue;
d3623099
ND		 2140 if (!__xfrm_state_filter_match(state, walk->filter))
2141 continue;
12a169e7
HX		 2142 err = func(state, walk->seq, data);
2143 if (err) {
2144 list_move_tail(&walk->all, &x->all);
2145 goto out;
1da177e4 2146 }
12a169e7 2147 walk->seq++;
1da177e4 2148 }
12a169e7 2149 if (walk->seq == 0) {
1da177e4
LT		 2150 err = -ENOENT;
2151 goto out;
2152 }
12a169e7 2153 list_del_init(&walk->all);
1da177e4 2154out:
283bc9f3 2155 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 2156 return err;
2157}
2158EXPORT_SYMBOL(xfrm_state_walk);
2159
d3623099 2160void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
870a2df4 2161 struct xfrm_address_filter *filter)
5c182458 2162{
12a169e7 2163 INIT_LIST_HEAD(&walk->all);
5c182458 2164 walk->proto = proto;
12a169e7
HX		 2165 walk->state = XFRM_STATE_DEAD;
2166 walk->seq = 0;
d3623099 2167 walk->filter = filter;
5c182458
HX		 2168}
2169EXPORT_SYMBOL(xfrm_state_walk_init);
2170
283bc9f3 2171void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
abb81c4f 2172{
d3623099
ND		 2173 kfree(walk->filter);
2174
12a169e7 2175 if (list_empty(&walk->all))
5c182458 2176 return;
5c182458 2177
283bc9f3 2178 spin_lock_bh(&net->xfrm.xfrm_state_lock);
12a169e7 2179 list_del(&walk->all);
283bc9f3 2180 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
abb81c4f
HX		 2181}
2182EXPORT_SYMBOL(xfrm_state_walk_done);
2183
e99e88a9 2184static void xfrm_replay_timer_handler(struct timer_list *t)
f8cd5488 2185{
e99e88a9 2186 struct xfrm_state *x = from_timer(x, t, rtimer);
f8cd5488
JHS		 2187
2188 spin_lock(&x->lock);
2189
2717096a 2190 if (x->km.state == XFRM_STATE_VALID) {
a6483b79 2191 if (xfrm_aevent_is_on(xs_net(x)))
cfc61c59 2192 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2717096a
JHS		 2193 else
2194 x->xflags |= XFRM_TIME_DEFER;
2195 }
f8cd5488
JHS		 2196
2197 spin_unlock(&x->lock);
2198}
2199
df01812e 2200static LIST_HEAD(xfrm_km_list);
1da177e4 2201
214e005b 2202void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4
LT		 2203{
2204 struct xfrm_mgr *km;
2205
85168c00
CW		 2206 rcu_read_lock();
2207 list_for_each_entry_rcu(km, &xfrm_km_list, list)
26b15dad
JHS		 2208 if (km->notify_policy)
2209 km->notify_policy(xp, dir, c);
85168c00 2210 rcu_read_unlock();
26b15dad 2211}
1da177e4 2212
214e005b 2213void km_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2214{
2215 struct xfrm_mgr *km;
85168c00
CW		 2216 rcu_read_lock();
2217 list_for_each_entry_rcu(km, &xfrm_km_list, list)
26b15dad
JHS		 2218 if (km->notify)
2219 km->notify(x, c);
85168c00 2220 rcu_read_unlock();
26b15dad
JHS		 2221}
2222
2223EXPORT_SYMBOL(km_policy_notify);
2224EXPORT_SYMBOL(km_state_notify);
2225
15e47304 2226void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
26b15dad
JHS		 2227{
2228 struct km_event c;
2229
bf08867f 2230 c.data.hard = hard;
15e47304 2231 c.portid = portid;
f60f6b8f 2232 c.event = XFRM_MSG_EXPIRE;
26b15dad 2233 km_state_notify(x, &c);
1da177e4
LT		 2234}
2235
53bc6b4d 2236EXPORT_SYMBOL(km_state_expired);
26b15dad
JHS		 2237/*
2238 * We send to all registered managers regardless of failure
2239 * We are happy with one success
2240*/
980ebd25 2241int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1da177e4 2242{
26b15dad 2243 int err = -EINVAL, acqret;
1da177e4
LT		 2244 struct xfrm_mgr *km;
2245
85168c00
CW		 2246 rcu_read_lock();
2247 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
65e0736b 2248 acqret = km->acquire(x, t, pol);
26b15dad
JHS		 2249 if (!acqret)
2250 err = acqret;
1da177e4 2251 }
85168c00 2252 rcu_read_unlock();
1da177e4
LT		 2253 return err;
2254}
980ebd25 2255EXPORT_SYMBOL(km_query);
1da177e4 2256
4e484b3e 2257static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1da177e4
LT		 2258{
2259 int err = -EINVAL;
2260 struct xfrm_mgr *km;
2261
85168c00
CW		 2262 rcu_read_lock();
2263 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1da177e4
LT		 2264 if (km->new_mapping)
2265 err = km->new_mapping(x, ipaddr, sport);
2266 if (!err)
2267 break;
2268 }
85168c00 2269 rcu_read_unlock();
1da177e4
LT		 2270 return err;
2271}
4e484b3e
AA		 2272
2273int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2274{
2275 int ret = 0;
2276
2277 if (x->mapping_maxage) {
2278 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2279 x->new_mapping_sport != sport) {
2280 x->new_mapping_sport = sport;
2281 x->new_mapping = jiffies / HZ;
2282 ret = __km_new_mapping(x, ipaddr, sport);
2283 }
2284 } else {
2285 ret = __km_new_mapping(x, ipaddr, sport);
2286 }
2287
2288 return ret;
2289}
1da177e4
LT		 2290EXPORT_SYMBOL(km_new_mapping);
2291
15e47304 2292void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1da177e4 2293{
26b15dad 2294 struct km_event c;
1da177e4 2295
bf08867f 2296 c.data.hard = hard;
15e47304 2297 c.portid = portid;
f60f6b8f 2298 c.event = XFRM_MSG_POLEXPIRE;
26b15dad 2299 km_policy_notify(pol, dir, &c);
1da177e4 2300}
a70fcb0b 2301EXPORT_SYMBOL(km_policy_expired);
1da177e4 2302
2d60abc2 2303#ifdef CONFIG_XFRM_MIGRATE
183cad12
DM		 2304int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2305 const struct xfrm_migrate *m, int num_migrate,
8bafd730
AA		 2306 const struct xfrm_kmaddress *k,
2307 const struct xfrm_encap_tmpl *encap)
80c9abaa
SS		 2308{
2309 int err = -EINVAL;
2310 int ret;
2311 struct xfrm_mgr *km;
2312
85168c00
CW		 2313 rcu_read_lock();
2314 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
80c9abaa 2315 if (km->migrate) {
8bafd730
AA		 2316 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2317 encap);
80c9abaa
SS		 2318 if (!ret)
2319 err = ret;
2320 }
2321 }
85168c00 2322 rcu_read_unlock();
80c9abaa
SS		 2323 return err;
2324}
2325EXPORT_SYMBOL(km_migrate);
2d60abc2 2326#endif
80c9abaa 2327
db983c11 2328int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2329{
2330 int err = -EINVAL;
2331 int ret;
2332 struct xfrm_mgr *km;
2333
85168c00
CW		 2334 rcu_read_lock();
2335 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
97a64b45 2336 if (km->report) {
db983c11 2337 ret = km->report(net, proto, sel, addr);
97a64b45
MN		 2338 if (!ret)
2339 err = ret;
2340 }
2341 }
85168c00 2342 rcu_read_unlock();
97a64b45
MN		 2343 return err;
2344}
2345EXPORT_SYMBOL(km_report);
2346
bb9cd077 2347static bool km_is_alive(const struct km_event *c)
0f24558e
HG		 2348{
2349 struct xfrm_mgr *km;
2350 bool is_alive = false;
2351
2352 rcu_read_lock();
2353 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2354 if (km->is_alive && km->is_alive(c)) {
2355 is_alive = true;
2356 break;
2357 }
2358 }
2359 rcu_read_unlock();
2360
2361 return is_alive;
2362}
0f24558e 2363
c9e7c76d
DS		 2364#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2365static DEFINE_SPINLOCK(xfrm_translator_lock);
2366static struct xfrm_translator __rcu *xfrm_translator;
2367
2368struct xfrm_translator *xfrm_get_translator(void)
2369{
2370 struct xfrm_translator *xtr;
2371
2372 rcu_read_lock();
2373 xtr = rcu_dereference(xfrm_translator);
2374 if (unlikely(!xtr))
2375 goto out;
2376 if (!try_module_get(xtr->owner))
2377 xtr = NULL;
2378out:
2379 rcu_read_unlock();
2380 return xtr;
2381}
2382EXPORT_SYMBOL_GPL(xfrm_get_translator);
2383
2384void xfrm_put_translator(struct xfrm_translator *xtr)
2385{
2386 module_put(xtr->owner);
2387}
2388EXPORT_SYMBOL_GPL(xfrm_put_translator);
2389
2390int xfrm_register_translator(struct xfrm_translator *xtr)
2391{
2392 int err = 0;
2393
2394 spin_lock_bh(&xfrm_translator_lock);
2395 if (unlikely(xfrm_translator != NULL))
2396 err = -EEXIST;
2397 else
2398 rcu_assign_pointer(xfrm_translator, xtr);
2399 spin_unlock_bh(&xfrm_translator_lock);
2400
2401 return err;
2402}
2403EXPORT_SYMBOL_GPL(xfrm_register_translator);
2404
2405int xfrm_unregister_translator(struct xfrm_translator *xtr)
2406{
2407 int err = 0;
2408
2409 spin_lock_bh(&xfrm_translator_lock);
2410 if (likely(xfrm_translator != NULL)) {
2411 if (rcu_access_pointer(xfrm_translator) != xtr)
2412 err = -EINVAL;
2413 else
2414 RCU_INIT_POINTER(xfrm_translator, NULL);
2415 }
2416 spin_unlock_bh(&xfrm_translator_lock);
2417 synchronize_rcu();
2418
2419 return err;
2420}
2421EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2422#endif
2423
c6d1b26a 2424int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
1da177e4
LT		 2425{
2426 int err;
2427 u8 *data;
2428 struct xfrm_mgr *km;
2429 struct xfrm_policy *pol = NULL;
2430
c6d1b26a 2431 if (sockptr_is_null(optval) && !optlen) {
be8f8284
LC		 2432 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2433 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2434 __sk_dst_reset(sk);
2435 return 0;
2436 }
2437
1da177e4
LT		 2438 if (optlen <= 0 || optlen > PAGE_SIZE)
2439 return -EMSGSIZE;
2440
c6d1b26a 2441 data = memdup_sockptr(optval, optlen);
a133d930
GT		 2442 if (IS_ERR(data))
2443 return PTR_ERR(data);
1da177e4 2444
96392ee5
DS		 2445 if (in_compat_syscall()) {
2446 struct xfrm_translator *xtr = xfrm_get_translator();
2447
48f486e1
YK		 2448 if (!xtr) {
2449 kfree(data);
96392ee5 2450 return -EOPNOTSUPP;
48f486e1 2451 }
96392ee5
DS		 2452
2453 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2454 xfrm_put_translator(xtr);
2455 if (err) {
2456 kfree(data);
2457 return err;
2458 }
2459 }
2460
1da177e4 2461 err = -EINVAL;
85168c00
CW		 2462 rcu_read_lock();
2463 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
cb969f07 2464 pol = km->compile_policy(sk, optname, data,
1da177e4
LT		 2465 optlen, &err);
2466 if (err >= 0)
2467 break;
2468 }
85168c00 2469 rcu_read_unlock();
1da177e4
LT		 2470
2471 if (err >= 0) {
2472 xfrm_sk_policy_insert(sk, err, pol);
2473 xfrm_pol_put(pol);
2b06cdf3 2474 __sk_dst_reset(sk);
1da177e4
LT		 2475 err = 0;
2476 }
2477
1da177e4
LT		 2478 kfree(data);
2479 return err;
2480}
2481EXPORT_SYMBOL(xfrm_user_policy);
2482
85168c00
CW		 2483static DEFINE_SPINLOCK(xfrm_km_lock);
2484
f41b284a 2485void xfrm_register_km(struct xfrm_mgr *km)
1da177e4 2486{
85168c00
CW		 2487 spin_lock_bh(&xfrm_km_lock);
2488 list_add_tail_rcu(&km->list, &xfrm_km_list);
2489 spin_unlock_bh(&xfrm_km_lock);
1da177e4
LT		 2490}
2491EXPORT_SYMBOL(xfrm_register_km);
2492
f41b284a 2493void xfrm_unregister_km(struct xfrm_mgr *km)
1da177e4 2494{
85168c00
CW		 2495 spin_lock_bh(&xfrm_km_lock);
2496 list_del_rcu(&km->list);
2497 spin_unlock_bh(&xfrm_km_lock);
2498 synchronize_rcu();
1da177e4
LT		 2499}
2500EXPORT_SYMBOL(xfrm_unregister_km);
2501
2502int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2503{
2504 int err = 0;
423826a7
FW		 2505
2506 if (WARN_ON(afinfo->family >= NPROTO))
1da177e4 2507 return -EAFNOSUPPORT;
423826a7 2508
44abdc30 2509 spin_lock_bh(&xfrm_state_afinfo_lock);
1da177e4 2510 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
f31e8d4f 2511 err = -EEXIST;
edcd5821 2512 else
44abdc30
CW		 2513 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2514 spin_unlock_bh(&xfrm_state_afinfo_lock);
1da177e4
LT		 2515 return err;
2516}
2517EXPORT_SYMBOL(xfrm_state_register_afinfo);
2518
2519int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2520{
423826a7
FW		 2521 int err = 0, family = afinfo->family;
2522
2523 if (WARN_ON(family >= NPROTO))
1da177e4 2524 return -EAFNOSUPPORT;
423826a7 2525
44abdc30 2526 spin_lock_bh(&xfrm_state_afinfo_lock);
1da177e4 2527 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
423826a7 2528 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
1da177e4 2529 err = -EINVAL;
edcd5821 2530 else
44abdc30 2531 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1da177e4 2532 }
44abdc30
CW		 2533 spin_unlock_bh(&xfrm_state_afinfo_lock);
2534 synchronize_rcu();
1da177e4
LT		 2535 return err;
2536}
2537EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2538
711059b9
FW		 2539struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2540{
2541 if (unlikely(family >= NPROTO))
2542 return NULL;
2543
2544 return rcu_dereference(xfrm_state_afinfo[family]);
2545}
733a5fac 2546EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
711059b9 2547
628e341f 2548struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1da177e4
LT		 2549{
2550 struct xfrm_state_afinfo *afinfo;
2551 if (unlikely(family >= NPROTO))
2552 return NULL;
44abdc30
CW		 2553 rcu_read_lock();
2554 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
546be240 2555 if (unlikely(!afinfo))
44abdc30 2556 rcu_read_unlock();
1da177e4
LT		 2557 return afinfo;
2558}
2559
b48c05ab
SK		 2560void xfrm_flush_gc(void)
2561{
2562 flush_work(&xfrm_state_gc_work);
2563}
2564EXPORT_SYMBOL(xfrm_flush_gc);
2565
1da177e4
LT		 2566/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2567void xfrm_state_delete_tunnel(struct xfrm_state *x)
2568{
2569 if (x->tunnel) {
2570 struct xfrm_state *t = x->tunnel;
2571
2572 if (atomic_read(&t->tunnel_users) == 2)
2573 xfrm_state_delete(t);
2574 atomic_dec(&t->tunnel_users);
f75a2804 2575 xfrm_state_put_sync(t);
1da177e4
LT		 2576 x->tunnel = NULL;
2577 }
2578}
2579EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2580
a6d95c5a 2581u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
1da177e4 2582{
b3b73b8e 2583 const struct xfrm_type *type = READ_ONCE(x->type);
c7b37c76
FW		 2584 struct crypto_aead *aead;
2585 u32 blksize, net_adj = 0;
2586
2587 if (x->km.state != XFRM_STATE_VALID ||
2588 !type || type->proto != IPPROTO_ESP)
2589 return mtu - x->props.header_len;
2590
2591 aead = x->data;
2592 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
1da177e4 2593
c7b37c76
FW		 2594 switch (x->props.mode) {
2595 case XFRM_MODE_TRANSPORT:
2596 case XFRM_MODE_BEET:
2597 if (x->props.family == AF_INET)
2598 net_adj = sizeof(struct iphdr);
2599 else if (x->props.family == AF_INET6)
2600 net_adj = sizeof(struct ipv6hdr);
2601 break;
2602 case XFRM_MODE_TUNNEL:
2603 break;
2604 default:
2605 WARN_ON_ONCE(1);
2606 break;
2607 }
b3b73b8e 2608
c7b37c76
FW		 2609 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2610 net_adj) & ~(blksize - 1)) + net_adj - 2;
1da177e4 2611}
a6d95c5a 2612EXPORT_SYMBOL_GPL(xfrm_state_mtu);
1da177e4 2613
741f9a10
SD		 2614int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2615 struct netlink_ext_ack *extack)
72cb6962 2616{
c9500d7b
FW		 2617 const struct xfrm_mode *inner_mode;
2618 const struct xfrm_mode *outer_mode;
d094cd83 2619 int family = x->props.family;
72cb6962
HX		 2620 int err;
2621
e4681747 2622 if (family == AF_INET &&
0968d2a4 2623 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
e4681747 2624 x->props.flags |= XFRM_STATE_NOPMTUDISC;
d094cd83
HX		 2625
2626 err = -EPROTONOSUPPORT;
13996378 2627
df9dcb45
KM		 2628 if (x->sel.family != AF_UNSPEC) {
2629 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
741f9a10
SD		 2630 if (inner_mode == NULL) {
2631 NL_SET_ERR_MSG(extack, "Requested mode not found");
df9dcb45 2632 goto error;
741f9a10 2633 }
df9dcb45
KM		 2634
2635 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
741f9a10
SD		 2636 family != x->sel.family) {
2637 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
df9dcb45 2638 goto error;
741f9a10 2639 }
df9dcb45 2640
c9500d7b 2641 x->inner_mode = *inner_mode;
df9dcb45 2642 } else {
4c145dce 2643 const struct xfrm_mode *inner_mode_iaf;
d81d2285 2644 int iafamily = AF_INET;
df9dcb45 2645
d81d2285 2646 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
741f9a10
SD		 2647 if (inner_mode == NULL) {
2648 NL_SET_ERR_MSG(extack, "Requested mode not found");
df9dcb45 2649 goto error;
741f9a10 2650 }
df9dcb45 2651
741f9a10
SD		 2652 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2653 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate an AF_UNSPEC selector");
df9dcb45 2654 goto error;
741f9a10 2655 }
4c145dce 2656
c9500d7b 2657 x->inner_mode = *inner_mode;
df9dcb45 2658
d81d2285
MW		 2659 if (x->props.family == AF_INET)
2660 iafamily = AF_INET6;
df9dcb45 2661
d81d2285
MW		 2662 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2663 if (inner_mode_iaf) {
2664 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
c9500d7b 2665 x->inner_mode_iaf = *inner_mode_iaf;
df9dcb45
KM		 2666 }
2667 }
13996378 2668
d094cd83 2669 x->type = xfrm_get_type(x->id.proto, family);
741f9a10
SD		 2670 if (x->type == NULL) {
2671 NL_SET_ERR_MSG(extack, "Requested type not found");
72cb6962 2672 goto error;
741f9a10 2673 }
72cb6962 2674
ffdb5211 2675 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
9d389d7f 2676
e1e10b44 2677 err = x->type->init_state(x, extack);
72cb6962
HX		 2678 if (err)
2679 goto error;
2680
c9500d7b
FW		 2681 outer_mode = xfrm_get_mode(x->props.mode, family);
2682 if (!outer_mode) {
741f9a10 2683 NL_SET_ERR_MSG(extack, "Requested mode not found");
599901c3 2684 err = -EPROTONOSUPPORT;
b59f45d0 2685 goto error;
599901c3 2686 }
b59f45d0 2687
c9500d7b 2688 x->outer_mode = *outer_mode;
a454f0cc 2689 if (init_replay) {
1cf9a3ae 2690 err = xfrm_init_replay(x, extack);
a454f0cc
WY		 2691 if (err)
2692 goto error;
2693 }
2694
72cb6962
HX		 2695error:
2696 return err;
2697}
2698
a454f0cc
WY		 2699EXPORT_SYMBOL(__xfrm_init_state);
2700
2701int xfrm_init_state(struct xfrm_state *x)
2702{
cc01572e
YK		 2703 int err;
2704
741f9a10 2705 err = __xfrm_init_state(x, true, false, NULL);
cc01572e
YK		 2706 if (!err)
2707 x->km.state = XFRM_STATE_VALID;
2708
2709 return err;
a454f0cc
WY		 2710}
2711
72cb6962 2712EXPORT_SYMBOL(xfrm_init_state);
a716c119 2713
d62ddc21 2714int __net_init xfrm_state_init(struct net *net)
1da177e4 2715{
f034b5d4
DM		 2716 unsigned int sz;
2717
565f0fa9
MK		 2718 if (net_eq(net, &init_net))
2719 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2720 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2721
9d4139c7
AD		 2722 INIT_LIST_HEAD(&net->xfrm.state_all);
2723
f034b5d4
DM		 2724 sz = sizeof(struct hlist_head) * 8;
2725
73d189dc
AD		 2726 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2727 if (!net->xfrm.state_bydst)
2728 goto out_bydst;
d320bbb3
AD		 2729 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2730 if (!net->xfrm.state_bysrc)
2731 goto out_bysrc;
b754a4fd
AD		 2732 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2733 if (!net->xfrm.state_byspi)
2734 goto out_byspi;
fe9f1d87
SD		 2735 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2736 if (!net->xfrm.state_byseq)
2737 goto out_byseq;
529983ec 2738 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
1da177e4 2739
0bf7c5b0 2740 net->xfrm.state_num = 0;
63082733 2741 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
283bc9f3 2742 spin_lock_init(&net->xfrm.xfrm_state_lock);
bc8e0adf
AD		 2743 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2744 &net->xfrm.xfrm_state_lock);
d62ddc21 2745 return 0;
73d189dc 2746
fe9f1d87
SD		 2747out_byseq:
2748 xfrm_hash_free(net->xfrm.state_byspi, sz);
b754a4fd
AD		 2749out_byspi:
2750 xfrm_hash_free(net->xfrm.state_bysrc, sz);
d320bbb3
AD		 2751out_bysrc:
2752 xfrm_hash_free(net->xfrm.state_bydst, sz);
73d189dc
AD		 2753out_bydst:
2754 return -ENOMEM;
d62ddc21
AD		 2755}
2756
2757void xfrm_state_fini(struct net *net)
2758{
73d189dc
AD		 2759 unsigned int sz;
2760
7c2776ee 2761 flush_work(&net->xfrm.state_hash_work);
35db57bb 2762 flush_work(&xfrm_state_gc_work);
dbb2483b 2763 xfrm_state_flush(net, 0, false, true);
7c2776ee 2764
9d4139c7 2765 WARN_ON(!list_empty(&net->xfrm.state_all));
73d189dc 2766
529983ec 2767 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
fe9f1d87
SD		 2768 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2769 xfrm_hash_free(net->xfrm.state_byseq, sz);
b754a4fd
AD		 2770 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2771 xfrm_hash_free(net->xfrm.state_byspi, sz);
d320bbb3
AD		 2772 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2773 xfrm_hash_free(net->xfrm.state_bysrc, sz);
73d189dc
AD		 2774 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2775 xfrm_hash_free(net->xfrm.state_bydst, sz);
1da177e4
LT		 2776}
2777
ab5f5e8b 2778#ifdef CONFIG_AUDITSYSCALL
cf35f43e
IJ		 2779static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2780 struct audit_buffer *audit_buf)
ab5f5e8b 2781{
68277acc
PM		 2782 struct xfrm_sec_ctx *ctx = x->security;
2783 u32 spi = ntohl(x->id.spi);
2784
2785 if (ctx)
ab5f5e8b 2786 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
68277acc 2787 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2788
9b7a787d 2789 switch (x->props.family) {
ab5f5e8b 2790 case AF_INET:
21454aaa
HH		 2791 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2792 &x->props.saddr.a4, &x->id.daddr.a4);
ab5f5e8b
JL		 2793 break;
2794 case AF_INET6:
5b095d98 2795 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
fdb46ee7 2796 x->props.saddr.a6, x->id.daddr.a6);
ab5f5e8b
JL		 2797 break;
2798 }
68277acc
PM		 2799
2800 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
ab5f5e8b
JL		 2801}
2802
cf35f43e
IJ		 2803static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2804 struct audit_buffer *audit_buf)
afeb14b4 2805{
b71d1d42
ED		 2806 const struct iphdr *iph4;
2807 const struct ipv6hdr *iph6;
afeb14b4
PM		 2808
2809 switch (family) {
2810 case AF_INET:
2811 iph4 = ip_hdr(skb);
21454aaa
HH		 2812 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2813 &iph4->saddr, &iph4->daddr);
afeb14b4
PM		 2814 break;
2815 case AF_INET6:
2816 iph6 = ipv6_hdr(skb);
2817 audit_log_format(audit_buf,
5b095d98 2818 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
9b7a787d 2819 &iph6->saddr, &iph6->daddr,
afeb14b4
PM		 2820 iph6->flow_lbl[0] & 0x0f,
2821 iph6->flow_lbl[1],
2822 iph6->flow_lbl[2]);
2823 break;
2824 }
2825}
2826
2e71029e 2827void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
ab5f5e8b
JL		 2828{
2829 struct audit_buffer *audit_buf;
ab5f5e8b 2830
afeb14b4 2831 audit_buf = xfrm_audit_start("SAD-add");
ab5f5e8b
JL		 2832 if (audit_buf == NULL)
2833 return;
2e71029e 2834 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4
PM		 2835 xfrm_audit_helper_sainfo(x, audit_buf);
2836 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 2837 audit_log_end(audit_buf);
2838}
2839EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2840
2e71029e 2841void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
ab5f5e8b
JL		 2842{
2843 struct audit_buffer *audit_buf;
ab5f5e8b 2844
afeb14b4 2845 audit_buf = xfrm_audit_start("SAD-delete");
ab5f5e8b
JL		 2846 if (audit_buf == NULL)
2847 return;
2e71029e 2848 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4
PM		 2849 xfrm_audit_helper_sainfo(x, audit_buf);
2850 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 2851 audit_log_end(audit_buf);
2852}
2853EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
afeb14b4
PM		 2854
2855void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2856 struct sk_buff *skb)
2857{
2858 struct audit_buffer *audit_buf;
2859 u32 spi;
2860
2861 audit_buf = xfrm_audit_start("SA-replay-overflow");
2862 if (audit_buf == NULL)
2863 return;
2864 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2865 /* don't record the sequence number because it's inherent in this kind
2866 * of audit message */
2867 spi = ntohl(x->id.spi);
2868 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2869 audit_log_end(audit_buf);
2870}
2871EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2872
9fdc4883 2873void xfrm_audit_state_replay(struct xfrm_state *x,
afeb14b4
PM		 2874 struct sk_buff *skb, __be32 net_seq)
2875{
2876 struct audit_buffer *audit_buf;
2877 u32 spi;
2878
2879 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2880 if (audit_buf == NULL)
2881 return;
2882 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2883 spi = ntohl(x->id.spi);
2884 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2885 spi, spi, ntohl(net_seq));
2886 audit_log_end(audit_buf);
2887}
9fdc4883 2888EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
afeb14b4
PM		 2889
2890void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2891{
2892 struct audit_buffer *audit_buf;
2893
2894 audit_buf = xfrm_audit_start("SA-notfound");
2895 if (audit_buf == NULL)
2896 return;
2897 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2898 audit_log_end(audit_buf);
2899}
2900EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2901
2902void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2903 __be32 net_spi, __be32 net_seq)
2904{
2905 struct audit_buffer *audit_buf;
2906 u32 spi;
2907
2908 audit_buf = xfrm_audit_start("SA-notfound");
2909 if (audit_buf == NULL)
2910 return;
2911 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2912 spi = ntohl(net_spi);
2913 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2914 spi, spi, ntohl(net_seq));
2915 audit_log_end(audit_buf);
2916}
2917EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2918
2919void xfrm_audit_state_icvfail(struct xfrm_state *x,
2920 struct sk_buff *skb, u8 proto)
2921{
2922 struct audit_buffer *audit_buf;
2923 __be32 net_spi;
2924 __be32 net_seq;
2925
2926 audit_buf = xfrm_audit_start("SA-icv-failure");
2927 if (audit_buf == NULL)
2928 return;
2929 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2930 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2931 u32 spi = ntohl(net_spi);
2932 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2933 spi, spi, ntohl(net_seq));
2934 }
2935 audit_log_end(audit_buf);
2936}
2937EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
ab5f5e8b 2938#endif /* CONFIG_AUDITSYSCALL */
Linux 6.x block layer and io_uring tree(s)