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netdevsim: add Makefile for selftests
[linux.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 <[email protected]>
9 * IPv6 support
10 * YOSHIFUJI Hideaki @USAGI
11 * Split up af-specific functions
12 * Derek Atkins <[email protected]>
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
3c611d40
LR		 87#define XFRM_STATE_INSERT(by, _n, _h, _type) \
88 { \
89 struct xfrm_state *_x = NULL; \
90 \
91 if (_type != XFRM_DEV_OFFLOAD_PACKET) { \
92 hlist_for_each_entry_rcu(_x, _h, by) { \
93 if (_x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \
94 continue; \
95 break; \
96 } \
97 } \
98 \
99 if (!_x || _x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \
100 /* SAD is empty or consist from HW SAs only */ \
101 hlist_add_head_rcu(_n, _h); \
102 else \
103 hlist_add_before_rcu(_n, &_x->by); \
104 }
105
f034b5d4
DM		 106static void xfrm_hash_transfer(struct hlist_head *list,
107 struct hlist_head *ndsttable,
108 struct hlist_head *nsrctable,
109 struct hlist_head *nspitable,
fe9f1d87 110 struct hlist_head *nseqtable,
f034b5d4
DM		 111 unsigned int nhashmask)
112{
b67bfe0d 113 struct hlist_node *tmp;
f034b5d4
DM		 114 struct xfrm_state *x;
115
b67bfe0d 116 hlist_for_each_entry_safe(x, tmp, list, bydst) {
f034b5d4
DM		 117 unsigned int h;
118
c1969f29
DM		 119 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
120 x->props.reqid, x->props.family,
121 nhashmask);
3c611d40 122 XFRM_STATE_INSERT(bydst, &x->bydst, ndsttable + h, x->xso.type);
f034b5d4 123
667bbcb6
MN		 124 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
125 x->props.family,
f034b5d4 126 nhashmask);
3c611d40 127 XFRM_STATE_INSERT(bysrc, &x->bysrc, nsrctable + h, x->xso.type);
f034b5d4 128
7b4dc360
MN		 129 if (x->id.spi) {
130 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
131 x->id.proto, x->props.family,
132 nhashmask);
3c611d40
LR		 133 XFRM_STATE_INSERT(byspi, &x->byspi, nspitable + h,
134 x->xso.type);
7b4dc360 135 }
fe9f1d87
SD		 136
137 if (x->km.seq) {
138 h = __xfrm_seq_hash(x->km.seq, nhashmask);
3c611d40
LR		 139 XFRM_STATE_INSERT(byseq, &x->byseq, nseqtable + h,
140 x->xso.type);
fe9f1d87 141 }
f034b5d4
DM		 142 }
143}
144
63082733 145static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
f034b5d4 146{
63082733 147 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
f034b5d4
DM		 148}
149
63082733 150static void xfrm_hash_resize(struct work_struct *work)
f034b5d4 151{
63082733 152 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
fe9f1d87 153 struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
f034b5d4
DM		 154 unsigned long nsize, osize;
155 unsigned int nhashmask, ohashmask;
156 int i;
157
63082733 158 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
44e36b42 159 ndst = xfrm_hash_alloc(nsize);
f034b5d4 160 if (!ndst)
0244790c 161 return;
44e36b42 162 nsrc = xfrm_hash_alloc(nsize);
f034b5d4 163 if (!nsrc) {
44e36b42 164 xfrm_hash_free(ndst, nsize);
0244790c 165 return;
f034b5d4 166 }
44e36b42 167 nspi = xfrm_hash_alloc(nsize);
f034b5d4 168 if (!nspi) {
44e36b42
DM		 169 xfrm_hash_free(ndst, nsize);
170 xfrm_hash_free(nsrc, nsize);
0244790c 171 return;
f034b5d4 172 }
fe9f1d87
SD		 173 nseq = xfrm_hash_alloc(nsize);
174 if (!nseq) {
175 xfrm_hash_free(ndst, nsize);
176 xfrm_hash_free(nsrc, nsize);
177 xfrm_hash_free(nspi, nsize);
178 return;
179 }
f034b5d4 180
283bc9f3 181 spin_lock_bh(&net->xfrm.xfrm_state_lock);
e88add19 182 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
f034b5d4
DM		 183
184 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
c8406998 185 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
63082733 186 for (i = net->xfrm.state_hmask; i >= 0; i--)
fe9f1d87 187 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
f034b5d4 188
c8406998
FW		 189 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
190 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
fe9f1d87 191 oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
63082733 192 ohashmask = net->xfrm.state_hmask;
f034b5d4 193
c8406998
FW		 194 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
195 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
196 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
fe9f1d87 197 rcu_assign_pointer(net->xfrm.state_byseq, nseq);
63082733 198 net->xfrm.state_hmask = nhashmask;
f034b5d4 199
e88add19 200 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
283bc9f3 201 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
f034b5d4
DM		 202
203 osize = (ohashmask + 1) * sizeof(struct hlist_head);
df7274eb
FW		 204
205 synchronize_rcu();
206
44e36b42
DM		 207 xfrm_hash_free(odst, osize);
208 xfrm_hash_free(osrc, osize);
209 xfrm_hash_free(ospi, osize);
fe9f1d87 210 xfrm_hash_free(oseq, osize);
f034b5d4
DM		 211}
212
44abdc30
CW		 213static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
214static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
1da177e4 215
1da177e4
LT		 216static DEFINE_SPINLOCK(xfrm_state_gc_lock);
217
53bc6b4d 218int __xfrm_state_delete(struct xfrm_state *x);
1da177e4 219
980ebd25 220int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
bb9cd077 221static bool km_is_alive(const struct km_event *c);
15e47304 222void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
1da177e4 223
533cb5b0 224int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
aa5d62cc 225{
7a9885b9 226 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
aa5d62cc
HX		 227 int err = 0;
228
4f518e80 229 if (!afinfo)
aa5d62cc 230 return -EAFNOSUPPORT;
4f518e80
FW		 231
232#define X(afi, T, name) do { \
233 WARN_ON((afi)->type_ ## name); \
234 (afi)->type_ ## name = (T); \
235 } while (0)
236
237 switch (type->proto) {
238 case IPPROTO_COMP:
239 X(afinfo, type, comp);
240 break;
241 case IPPROTO_AH:
242 X(afinfo, type, ah);
243 break;
244 case IPPROTO_ESP:
245 X(afinfo, type, esp);
246 break;
247 case IPPROTO_IPIP:
248 X(afinfo, type, ipip);
249 break;
250 case IPPROTO_DSTOPTS:
251 X(afinfo, type, dstopts);
252 break;
253 case IPPROTO_ROUTING:
254 X(afinfo, type, routing);
255 break;
256 case IPPROTO_IPV6:
257 X(afinfo, type, ipip6);
258 break;
259 default:
260 WARN_ON(1);
261 err = -EPROTONOSUPPORT;
262 break;
263 }
264#undef X
af5d27c4 265 rcu_read_unlock();
aa5d62cc
HX		 266 return err;
267}
268EXPORT_SYMBOL(xfrm_register_type);
269
4f518e80 270void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
aa5d62cc 271{
7a9885b9 272 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
aa5d62cc
HX		 273
274 if (unlikely(afinfo == NULL))
4f518e80
FW		 275 return;
276
277#define X(afi, T, name) do { \
278 WARN_ON((afi)->type_ ## name != (T)); \
279 (afi)->type_ ## name = NULL; \
280 } while (0)
281
282 switch (type->proto) {
283 case IPPROTO_COMP:
284 X(afinfo, type, comp);
285 break;
286 case IPPROTO_AH:
287 X(afinfo, type, ah);
288 break;
289 case IPPROTO_ESP:
290 X(afinfo, type, esp);
291 break;
292 case IPPROTO_IPIP:
293 X(afinfo, type, ipip);
294 break;
295 case IPPROTO_DSTOPTS:
296 X(afinfo, type, dstopts);
297 break;
298 case IPPROTO_ROUTING:
299 X(afinfo, type, routing);
300 break;
301 case IPPROTO_IPV6:
302 X(afinfo, type, ipip6);
303 break;
304 default:
305 WARN_ON(1);
306 break;
307 }
308#undef X
af5d27c4 309 rcu_read_unlock();
aa5d62cc
HX		 310}
311EXPORT_SYMBOL(xfrm_unregister_type);
312
533cb5b0 313static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
aa5d62cc 314{
4f518e80 315 const struct xfrm_type *type = NULL;
aa5d62cc 316 struct xfrm_state_afinfo *afinfo;
aa5d62cc
HX		 317 int modload_attempted = 0;
318
319retry:
320 afinfo = xfrm_state_get_afinfo(family);
321 if (unlikely(afinfo == NULL))
322 return NULL;
aa5d62cc 323
4f518e80
FW		 324 switch (proto) {
325 case IPPROTO_COMP:
326 type = afinfo->type_comp;
327 break;
328 case IPPROTO_AH:
329 type = afinfo->type_ah;
330 break;
331 case IPPROTO_ESP:
332 type = afinfo->type_esp;
333 break;
334 case IPPROTO_IPIP:
335 type = afinfo->type_ipip;
336 break;
337 case IPPROTO_DSTOPTS:
338 type = afinfo->type_dstopts;
339 break;
340 case IPPROTO_ROUTING:
341 type = afinfo->type_routing;
342 break;
343 case IPPROTO_IPV6:
344 type = afinfo->type_ipip6;
345 break;
346 default:
347 break;
348 }
349
aa5d62cc
HX		 350 if (unlikely(type && !try_module_get(type->owner)))
351 type = NULL;
75cda62d
FW		 352
353 rcu_read_unlock();
354
aa5d62cc 355 if (!type && !modload_attempted) {
aa5d62cc
HX		 356 request_module("xfrm-type-%d-%d", family, proto);
357 modload_attempted = 1;
358 goto retry;
359 }
360
aa5d62cc
HX		 361 return type;
362}
363
533cb5b0 364static void xfrm_put_type(const struct xfrm_type *type)
aa5d62cc
HX		 365{
366 module_put(type->owner);
367}
368
9d389d7f
SK		 369int xfrm_register_type_offload(const struct xfrm_type_offload *type,
370 unsigned short family)
371{
372 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
9d389d7f
SK		 373 int err = 0;
374
375 if (unlikely(afinfo == NULL))
376 return -EAFNOSUPPORT;
4f518e80
FW		 377
378 switch (type->proto) {
379 case IPPROTO_ESP:
380 WARN_ON(afinfo->type_offload_esp);
381 afinfo->type_offload_esp = type;
382 break;
383 default:
384 WARN_ON(1);
385 err = -EPROTONOSUPPORT;
386 break;
387 }
388
9d389d7f
SK		 389 rcu_read_unlock();
390 return err;
391}
392EXPORT_SYMBOL(xfrm_register_type_offload);
393
4f518e80
FW		 394void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
395 unsigned short family)
9d389d7f
SK		 396{
397 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
9d389d7f
SK		 398
399 if (unlikely(afinfo == NULL))
4f518e80
FW		 400 return;
401
402 switch (type->proto) {
403 case IPPROTO_ESP:
404 WARN_ON(afinfo->type_offload_esp != type);
405 afinfo->type_offload_esp = NULL;
406 break;
407 default:
408 WARN_ON(1);
409 break;
410 }
9d389d7f 411 rcu_read_unlock();
9d389d7f
SK		 412}
413EXPORT_SYMBOL(xfrm_unregister_type_offload);
414
ffdb5211
IT		 415static const struct xfrm_type_offload *
416xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
9d389d7f 417{
4f518e80 418 const struct xfrm_type_offload *type = NULL;
9d389d7f 419 struct xfrm_state_afinfo *afinfo;
9d389d7f 420
ffdb5211 421retry:
9d389d7f
SK		 422 afinfo = xfrm_state_get_afinfo(family);
423 if (unlikely(afinfo == NULL))
424 return NULL;
9d389d7f 425
4f518e80
FW		 426 switch (proto) {
427 case IPPROTO_ESP:
428 type = afinfo->type_offload_esp;
429 break;
430 default:
431 break;
432 }
433
9d389d7f
SK		 434 if ((type && !try_module_get(type->owner)))
435 type = NULL;
436
2f10a61c
SD		 437 rcu_read_unlock();
438
ffdb5211
IT		 439 if (!type && try_load) {
440 request_module("xfrm-offload-%d-%d", family, proto);
545d8ae7 441 try_load = false;
ffdb5211
IT		 442 goto retry;
443 }
444
9d389d7f
SK		 445 return type;
446}
447
448static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
449{
450 module_put(type->owner);
451}
452
4c145dce
FW		 453static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
454 [XFRM_MODE_BEET] = {
455 .encap = XFRM_MODE_BEET,
456 .flags = XFRM_MODE_FLAG_TUNNEL,
457 .family = AF_INET,
458 },
459 [XFRM_MODE_TRANSPORT] = {
460 .encap = XFRM_MODE_TRANSPORT,
461 .family = AF_INET,
462 },
463 [XFRM_MODE_TUNNEL] = {
464 .encap = XFRM_MODE_TUNNEL,
465 .flags = XFRM_MODE_FLAG_TUNNEL,
466 .family = AF_INET,
467 },
468};
469
470static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
471 [XFRM_MODE_BEET] = {
472 .encap = XFRM_MODE_BEET,
473 .flags = XFRM_MODE_FLAG_TUNNEL,
474 .family = AF_INET6,
475 },
476 [XFRM_MODE_ROUTEOPTIMIZATION] = {
477 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
478 .family = AF_INET6,
479 },
480 [XFRM_MODE_TRANSPORT] = {
481 .encap = XFRM_MODE_TRANSPORT,
482 .family = AF_INET6,
483 },
484 [XFRM_MODE_TUNNEL] = {
485 .encap = XFRM_MODE_TUNNEL,
486 .flags = XFRM_MODE_FLAG_TUNNEL,
487 .family = AF_INET6,
488 },
489};
490
491static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
492{
493 const struct xfrm_mode *mode;
aa5d62cc
HX		 494
495 if (unlikely(encap >= XFRM_MODE_MAX))
496 return NULL;
497
4c145dce
FW		 498 switch (family) {
499 case AF_INET:
500 mode = &xfrm4_mode_map[encap];
501 if (mode->family == family)
502 return mode;
503 break;
504 case AF_INET6:
505 mode = &xfrm6_mode_map[encap];
506 if (mode->family == family)
507 return mode;
508 break;
509 default:
510 break;
aa5d62cc
HX		 511 }
512
4c145dce 513 return NULL;
aa5d62cc
HX		 514}
515
4a135e53
MK		 516void xfrm_state_free(struct xfrm_state *x)
517{
518 kmem_cache_free(xfrm_state_cache, x);
519}
520EXPORT_SYMBOL(xfrm_state_free);
521
f75a2804 522static void ___xfrm_state_destroy(struct xfrm_state *x)
1da177e4 523{
671422b2 524 hrtimer_cancel(&x->mtimer);
a47f0ce0 525 del_timer_sync(&x->rtimer);
b5884793 526 kfree(x->aead);
a51482bd
JJ		 527 kfree(x->aalg);
528 kfree(x->ealg);
529 kfree(x->calg);
530 kfree(x->encap);
060f02a3 531 kfree(x->coaddr);
d8647b79
SK		 532 kfree(x->replay_esn);
533 kfree(x->preplay_esn);
9d389d7f
SK		 534 if (x->type_offload)
535 xfrm_put_type_offload(x->type_offload);
1da177e4
LT		 536 if (x->type) {
537 x->type->destructor(x);
538 xfrm_put_type(x->type);
539 }
86c6739e
SK		 540 if (x->xfrag.page)
541 put_page(x->xfrag.page);
d77e38e6 542 xfrm_dev_state_free(x);
df71837d 543 security_xfrm_state_free(x);
4a135e53 544 xfrm_state_free(x);
1da177e4
LT		 545}
546
c7837144 547static void xfrm_state_gc_task(struct work_struct *work)
1da177e4 548{
12a169e7 549 struct xfrm_state *x;
b67bfe0d 550 struct hlist_node *tmp;
12a169e7 551 struct hlist_head gc_list;
1da177e4 552
1da177e4 553 spin_lock_bh(&xfrm_state_gc_lock);
35db57bb 554 hlist_move_list(&xfrm_state_gc_list, &gc_list);
1da177e4
LT		 555 spin_unlock_bh(&xfrm_state_gc_lock);
556
df7274eb
FW		 557 synchronize_rcu();
558
b67bfe0d 559 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
f75a2804 560 ___xfrm_state_destroy(x);
1da177e4
LT		 561}
562
3e94c2dc 563static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
1da177e4 564{
671422b2
TG		 565 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
566 enum hrtimer_restart ret = HRTIMER_NORESTART;
386c5680
AB		 567 time64_t now = ktime_get_real_seconds();
568 time64_t next = TIME64_MAX;
1da177e4 569 int warn = 0;
161a09e7 570 int err = 0;
1da177e4
LT		 571
572 spin_lock(&x->lock);
f3da86dc
LR		 573 xfrm_dev_state_update_curlft(x);
574
1da177e4
LT		 575 if (x->km.state == XFRM_STATE_DEAD)
576 goto out;
577 if (x->km.state == XFRM_STATE_EXPIRED)
578 goto expired;
579 if (x->lft.hard_add_expires_seconds) {
195e4aac 580 time64_t tmo = x->lft.hard_add_expires_seconds +
1da177e4 581 x->curlft.add_time - now;
e3c0d047
FD		 582 if (tmo <= 0) {
583 if (x->xflags & XFRM_SOFT_EXPIRE) {
584 /* enter hard expire without soft expire first?!
585 * setting a new date could trigger this.
1365e547 586 * workaround: fix x->curflt.add_time by below:
e3c0d047
FD		 587 */
588 x->curlft.add_time = now - x->saved_tmo - 1;
589 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
590 } else
591 goto expired;
592 }
1da177e4
LT		 593 if (tmo < next)
594 next = tmo;
595 }
596 if (x->lft.hard_use_expires_seconds) {
195e4aac 597 time64_t tmo = x->lft.hard_use_expires_seconds +
0a9e5794 598 (READ_ONCE(x->curlft.use_time) ? : now) - now;
1da177e4
LT		 599 if (tmo <= 0)
600 goto expired;
601 if (tmo < next)
602 next = tmo;
603 }
604 if (x->km.dying)
605 goto resched;
606 if (x->lft.soft_add_expires_seconds) {
195e4aac 607 time64_t tmo = x->lft.soft_add_expires_seconds +
1da177e4 608 x->curlft.add_time - now;
e3c0d047 609 if (tmo <= 0) {
1da177e4 610 warn = 1;
e3c0d047
FD		 611 x->xflags &= ~XFRM_SOFT_EXPIRE;
612 } else if (tmo < next) {
1da177e4 613 next = tmo;
e3c0d047
FD		 614 x->xflags |= XFRM_SOFT_EXPIRE;
615 x->saved_tmo = tmo;
616 }
1da177e4
LT		 617 }
618 if (x->lft.soft_use_expires_seconds) {
195e4aac 619 time64_t tmo = x->lft.soft_use_expires_seconds +
0a9e5794 620 (READ_ONCE(x->curlft.use_time) ? : now) - now;
1da177e4
LT		 621 if (tmo <= 0)
622 warn = 1;
623 else if (tmo < next)
624 next = tmo;
625 }
626
4666faab 627 x->km.dying = warn;
1da177e4 628 if (warn)
53bc6b4d 629 km_state_expired(x, 0, 0);
1da177e4 630resched:
386c5680 631 if (next != TIME64_MAX) {
671422b2
TG		 632 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
633 ret = HRTIMER_RESTART;
9e0d57fd 634 }
a47f0ce0 635
1da177e4
LT		 636 goto out;
637
638expired:
5b8ef341 639 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
1da177e4 640 x->km.state = XFRM_STATE_EXPIRED;
161a09e7
JL		 641
642 err = __xfrm_state_delete(x);
0806ae4c 643 if (!err)
53bc6b4d 644 km_state_expired(x, 1, 0);
1da177e4 645
2e71029e 646 xfrm_audit_state_delete(x, err ? 0 : 1, true);
161a09e7 647
1da177e4
LT		 648out:
649 spin_unlock(&x->lock);
671422b2 650 return ret;
1da177e4
LT		 651}
652
e99e88a9 653static void xfrm_replay_timer_handler(struct timer_list *t);
0ac84752 654
673c09be 655struct xfrm_state *xfrm_state_alloc(struct net *net)
1da177e4
LT		 656{
657 struct xfrm_state *x;
658
a4c278d1 659 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
1da177e4
LT		 660
661 if (x) {
673c09be 662 write_pnet(&x->xs_net, net);
88755e9c 663 refcount_set(&x->refcnt, 1);
1da177e4 664 atomic_set(&x->tunnel_users, 0);
12a169e7 665 INIT_LIST_HEAD(&x->km.all);
8f126e37
DM		 666 INIT_HLIST_NODE(&x->bydst);
667 INIT_HLIST_NODE(&x->bysrc);
668 INIT_HLIST_NODE(&x->byspi);
fe9f1d87 669 INIT_HLIST_NODE(&x->byseq);
671422b2
TG		 670 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
671 x->mtimer.function = xfrm_timer_handler;
e99e88a9 672 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
386c5680 673 x->curlft.add_time = ktime_get_real_seconds();
1da177e4
LT		 674 x->lft.soft_byte_limit = XFRM_INF;
675 x->lft.soft_packet_limit = XFRM_INF;
676 x->lft.hard_byte_limit = XFRM_INF;
677 x->lft.hard_packet_limit = XFRM_INF;
f8cd5488
JHS		 678 x->replay_maxage = 0;
679 x->replay_maxdiff = 0;
1da177e4
LT		 680 spin_lock_init(&x->lock);
681 }
682 return x;
683}
684EXPORT_SYMBOL(xfrm_state_alloc);
685
f75a2804 686void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
1da177e4 687{
547b792c 688 WARN_ON(x->km.state != XFRM_STATE_DEAD);
1da177e4 689
f75a2804
CW		 690 if (sync) {
691 synchronize_rcu();
692 ___xfrm_state_destroy(x);
693 } else {
694 spin_lock_bh(&xfrm_state_gc_lock);
695 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
696 spin_unlock_bh(&xfrm_state_gc_lock);
697 schedule_work(&xfrm_state_gc_work);
698 }
1da177e4
LT		 699}
700EXPORT_SYMBOL(__xfrm_state_destroy);
701
53bc6b4d 702int __xfrm_state_delete(struct xfrm_state *x)
1da177e4 703{
98806f75 704 struct net *net = xs_net(x);
26b15dad
JHS		 705 int err = -ESRCH;
706
1da177e4
LT		 707 if (x->km.state != XFRM_STATE_DEAD) {
708 x->km.state = XFRM_STATE_DEAD;
283bc9f3 709 spin_lock(&net->xfrm.xfrm_state_lock);
12a169e7 710 list_del(&x->km.all);
ae3fb6d3
FW		 711 hlist_del_rcu(&x->bydst);
712 hlist_del_rcu(&x->bysrc);
fe9f1d87
SD		 713 if (x->km.seq)
714 hlist_del_rcu(&x->byseq);
a47f0ce0 715 if (x->id.spi)
ae3fb6d3 716 hlist_del_rcu(&x->byspi);
98806f75 717 net->xfrm.state_num--;
283bc9f3 718 spin_unlock(&net->xfrm.xfrm_state_lock);
1da177e4 719
e27cca96
SD		 720 if (x->encap_sk)
721 sock_put(rcu_dereference_raw(x->encap_sk));
722
d77e38e6
SK		 723 xfrm_dev_state_delete(x);
724
1da177e4
LT		 725 /* All xfrm_state objects are created by xfrm_state_alloc.
726 * The xfrm_state_alloc call gives a reference, and that
727 * is what we are dropping here.
728 */
5dba4797 729 xfrm_state_put(x);
26b15dad 730 err = 0;
1da177e4 731 }
26b15dad
JHS		 732
733 return err;
1da177e4 734}
53bc6b4d 735EXPORT_SYMBOL(__xfrm_state_delete);
1da177e4 736
26b15dad 737int xfrm_state_delete(struct xfrm_state *x)
1da177e4 738{
26b15dad
JHS		 739 int err;
740
1da177e4 741 spin_lock_bh(&x->lock);
26b15dad 742 err = __xfrm_state_delete(x);
1da177e4 743 spin_unlock_bh(&x->lock);
26b15dad
JHS		 744
745 return err;
1da177e4
LT		 746}
747EXPORT_SYMBOL(xfrm_state_delete);
748
4aa2e62c
JL		 749#ifdef CONFIG_SECURITY_NETWORK_XFRM
750static inline int
2e71029e 751xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
1da177e4 752{
4aa2e62c
JL		 753 int i, err = 0;
754
0e602451 755 for (i = 0; i <= net->xfrm.state_hmask; i++) {
4aa2e62c
JL		 756 struct xfrm_state *x;
757
b67bfe0d 758 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
4aa2e62c
JL		 759 if (xfrm_id_proto_match(x->id.proto, proto) &&
760 (err = security_xfrm_state_delete(x)) != 0) {
2e71029e 761 xfrm_audit_state_delete(x, 0, task_valid);
4aa2e62c
JL		 762 return err;
763 }
764 }
765 }
766
767 return err;
768}
d77e38e6
SK		 769
770static inline int
771xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
772{
773 int i, err = 0;
774
775 for (i = 0; i <= net->xfrm.state_hmask; i++) {
776 struct xfrm_state *x;
87e0a94e 777 struct xfrm_dev_offload *xso;
d77e38e6
SK		 778
779 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
780 xso = &x->xso;
781
782 if (xso->dev == dev &&
783 (err = security_xfrm_state_delete(x)) != 0) {
784 xfrm_audit_state_delete(x, 0, task_valid);
785 return err;
786 }
787 }
788 }
789
790 return err;
791}
4aa2e62c
JL		 792#else
793static inline int
2e71029e 794xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
4aa2e62c
JL		 795{
796 return 0;
797}
d77e38e6
SK		 798
799static inline int
800xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
801{
802 return 0;
803}
4aa2e62c
JL		 804#endif
805
f75a2804 806int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
4aa2e62c 807{
9e64cc95 808 int i, err = 0, cnt = 0;
1da177e4 809
283bc9f3 810 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2e71029e 811 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
4aa2e62c
JL		 812 if (err)
813 goto out;
814
9e64cc95 815 err = -ESRCH;
0e602451 816 for (i = 0; i <= net->xfrm.state_hmask; i++) {
8f126e37 817 struct xfrm_state *x;
1da177e4 818restart:
b67bfe0d 819 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1da177e4 820 if (!xfrm_state_kern(x) &&
5794708f 821 xfrm_id_proto_match(x->id.proto, proto)) {
1da177e4 822 xfrm_state_hold(x);
283bc9f3 823 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 824
161a09e7 825 err = xfrm_state_delete(x);
ab5f5e8b 826 xfrm_audit_state_delete(x, err ? 0 : 1,
2e71029e 827 task_valid);
f75a2804
CW		 828 if (sync)
829 xfrm_state_put_sync(x);
830 else
831 xfrm_state_put(x);
9e64cc95
JHS		 832 if (!err)
833 cnt++;
1da177e4 834
283bc9f3 835 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 836 goto restart;
837 }
838 }
839 }
dd269db8
AS		 840out:
841 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
e4db5b61 842 if (cnt)
9e64cc95 843 err = 0;
e4db5b61 844
4aa2e62c 845 return err;
1da177e4
LT		 846}
847EXPORT_SYMBOL(xfrm_state_flush);
848
d77e38e6
SK		 849int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
850{
851 int i, err = 0, cnt = 0;
852
853 spin_lock_bh(&net->xfrm.xfrm_state_lock);
854 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
855 if (err)
856 goto out;
857
858 err = -ESRCH;
859 for (i = 0; i <= net->xfrm.state_hmask; i++) {
860 struct xfrm_state *x;
87e0a94e 861 struct xfrm_dev_offload *xso;
d77e38e6
SK		 862restart:
863 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
864 xso = &x->xso;
865
866 if (!xfrm_state_kern(x) && xso->dev == dev) {
867 xfrm_state_hold(x);
868 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
869
870 err = xfrm_state_delete(x);
871 xfrm_audit_state_delete(x, err ? 0 : 1,
872 task_valid);
873 xfrm_state_put(x);
874 if (!err)
875 cnt++;
876
877 spin_lock_bh(&net->xfrm.xfrm_state_lock);
878 goto restart;
879 }
880 }
881 }
882 if (cnt)
883 err = 0;
884
885out:
886 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
887 return err;
888}
889EXPORT_SYMBOL(xfrm_dev_state_flush);
890
e071041b 891void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
28d8909b 892{
283bc9f3 893 spin_lock_bh(&net->xfrm.xfrm_state_lock);
e071041b 894 si->sadcnt = net->xfrm.state_num;
ca92e173 895 si->sadhcnt = net->xfrm.state_hmask + 1;
28d8909b 896 si->sadhmcnt = xfrm_state_hashmax;
283bc9f3 897 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
28d8909b
JHS		 898}
899EXPORT_SYMBOL(xfrm_sad_getinfo);
900
bac95935
FW		 901static void
902__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
903{
904 const struct flowi4 *fl4 = &fl->u.ip4;
905
906 sel->daddr.a4 = fl4->daddr;
907 sel->saddr.a4 = fl4->saddr;
908 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
909 sel->dport_mask = htons(0xffff);
910 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
911 sel->sport_mask = htons(0xffff);
912 sel->family = AF_INET;
913 sel->prefixlen_d = 32;
914 sel->prefixlen_s = 32;
915 sel->proto = fl4->flowi4_proto;
916 sel->ifindex = fl4->flowi4_oif;
917}
918
919static void
920__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
921{
922 const struct flowi6 *fl6 = &fl->u.ip6;
923
924 /* Initialize temporary selector matching only to current session. */
925 *(struct in6_addr *)&sel->daddr = fl6->daddr;
926 *(struct in6_addr *)&sel->saddr = fl6->saddr;
927 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
928 sel->dport_mask = htons(0xffff);
929 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
930 sel->sport_mask = htons(0xffff);
931 sel->family = AF_INET6;
932 sel->prefixlen_d = 128;
933 sel->prefixlen_s = 128;
934 sel->proto = fl6->flowi6_proto;
935 sel->ifindex = fl6->flowi6_oif;
936}
937
711059b9 938static void
1a898592 939xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
04686013 940 const struct xfrm_tmpl *tmpl,
33765d06 941 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
8444cf71 942 unsigned short family)
1da177e4 943{
bac95935
FW		 944 switch (family) {
945 case AF_INET:
946 __xfrm4_init_tempsel(&x->sel, fl);
947 break;
948 case AF_INET6:
949 __xfrm6_init_tempsel(&x->sel, fl);
950 break;
951 }
952
5c1b9ab3 953 x->id = tmpl->id;
bac95935 954
5c1b9ab3
FW		 955 switch (tmpl->encap_family) {
956 case AF_INET:
957 if (x->id.daddr.a4 == 0)
958 x->id.daddr.a4 = daddr->a4;
959 x->props.saddr = tmpl->saddr;
960 if (x->props.saddr.a4 == 0)
961 x->props.saddr.a4 = saddr->a4;
962 break;
963 case AF_INET6:
964 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
965 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
966 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
967 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
968 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
969 break;
970 }
3819a35f 971
5c1b9ab3
FW		 972 x->props.mode = tmpl->mode;
973 x->props.reqid = tmpl->reqid;
974 x->props.family = tmpl->encap_family;
1da177e4
LT		 975}
976
f8a70afa
LR		 977static struct xfrm_state *__xfrm_state_lookup_all(struct net *net, u32 mark,
978 const xfrm_address_t *daddr,
979 __be32 spi, u8 proto,
980 unsigned short family,
981 struct xfrm_dev_offload *xdo)
982{
983 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
984 struct xfrm_state *x;
985
986 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
987#ifdef CONFIG_XFRM_OFFLOAD
988 if (xdo->type == XFRM_DEV_OFFLOAD_PACKET) {
989 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
990 /* HW states are in the head of list, there is
991 * no need to iterate further.
992 */
993 break;
994
995 /* Packet offload: both policy and SA should
996 * have same device.
997 */
998 if (xdo->dev != x->xso.dev)
999 continue;
1000 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1001 /* Skip HW policy for SW lookups */
1002 continue;
1003#endif
1004 if (x->props.family != family ||
1005 x->id.spi != spi ||
1006 x->id.proto != proto ||
1007 !xfrm_addr_equal(&x->id.daddr, daddr, family))
1008 continue;
1009
1010 if ((mark & x->mark.m) != x->mark.v)
1011 continue;
1012 if (!xfrm_state_hold_rcu(x))
1013 continue;
1014 return x;
1015 }
1016
1017 return NULL;
1018}
1019
9aa60088
DM		 1020static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
1021 const xfrm_address_t *daddr,
1022 __be32 spi, u8 proto,
1023 unsigned short family)
edcd5821 1024{
221df1ed 1025 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
edcd5821
DM		 1026 struct xfrm_state *x;
1027
ae3fb6d3 1028 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
edcd5821
DM		 1029 if (x->props.family != family ||
1030 x->id.spi != spi ||
1802571b 1031 x->id.proto != proto ||
70e94e66 1032 !xfrm_addr_equal(&x->id.daddr, daddr, family))
edcd5821
DM		 1033 continue;
1034
3d6acfa7
JHS		 1035 if ((mark & x->mark.m) != x->mark.v)
1036 continue;
02efdff7
FW		 1037 if (!xfrm_state_hold_rcu(x))
1038 continue;
edcd5821
DM		 1039 return x;
1040 }
1041
1042 return NULL;
1043}
1044
9aa60088
DM		 1045static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1046 const xfrm_address_t *daddr,
1047 const xfrm_address_t *saddr,
1048 u8 proto, unsigned short family)
edcd5821 1049{
221df1ed 1050 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
edcd5821
DM		 1051 struct xfrm_state *x;
1052
ae3fb6d3 1053 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
edcd5821 1054 if (x->props.family != family ||
1802571b 1055 x->id.proto != proto ||
70e94e66
YH		 1056 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1057 !xfrm_addr_equal(&x->props.saddr, saddr, family))
edcd5821
DM		 1058 continue;
1059
3d6acfa7
JHS		 1060 if ((mark & x->mark.m) != x->mark.v)
1061 continue;
02efdff7
FW		 1062 if (!xfrm_state_hold_rcu(x))
1063 continue;
edcd5821
DM		 1064 return x;
1065 }
1066
1067 return NULL;
1068}
1069
1070static inline struct xfrm_state *
1071__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1072{
221df1ed 1073 struct net *net = xs_net(x);
bd55775c 1074 u32 mark = x->mark.v & x->mark.m;
221df1ed 1075
edcd5821 1076 if (use_spi)
bd55775c
JHS		 1077 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1078 x->id.spi, x->id.proto, family);
edcd5821 1079 else
bd55775c
JHS		 1080 return __xfrm_state_lookup_byaddr(net, mark,
1081 &x->id.daddr,
edcd5821
DM		 1082 &x->props.saddr,
1083 x->id.proto, family);
1084}
1085
98806f75 1086static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
2fab22f2
PM		 1087{
1088 if (have_hash_collision &&
98806f75
AD		 1089 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1090 net->xfrm.state_num > net->xfrm.state_hmask)
1091 schedule_work(&net->xfrm.state_hash_work);
2fab22f2
PM		 1092}
1093
08ec9af1 1094static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
4a08ab0f 1095 const struct flowi *fl, unsigned short family,
08ec9af1
DM		 1096 struct xfrm_state **best, int *acq_in_progress,
1097 int *error)
1098{
1099 /* Resolution logic:
1100 * 1. There is a valid state with matching selector. Done.
1101 * 2. Valid state with inappropriate selector. Skip.
1102 *
1103 * Entering area of "sysdeps".
1104 *
1105 * 3. If state is not valid, selector is temporary, it selects
1106 * only session which triggered previous resolution. Key
1107 * manager will do something to install a state with proper
1108 * selector.
1109 */
1110 if (x->km.state == XFRM_STATE_VALID) {
1111 if ((x->sel.family &&
e94ee171
HX		 1112 (x->sel.family != family ||
1113 !xfrm_selector_match(&x->sel, fl, family))) ||
3df98d79
PM		 1114 !security_xfrm_state_pol_flow_match(x, pol,
1115 &fl->u.__fl_common))
08ec9af1
DM		 1116 return;
1117
1118 if (!*best ||
1119 (*best)->km.dying > x->km.dying ||
1120 ((*best)->km.dying == x->km.dying &&
1121 (*best)->curlft.add_time < x->curlft.add_time))
1122 *best = x;
1123 } else if (x->km.state == XFRM_STATE_ACQ) {
1124 *acq_in_progress = 1;
1125 } else if (x->km.state == XFRM_STATE_ERROR ||
1126 x->km.state == XFRM_STATE_EXPIRED) {
e94ee171
HX		 1127 if ((!x->sel.family ||
1128 (x->sel.family == family &&
1129 xfrm_selector_match(&x->sel, fl, family))) &&
3df98d79
PM		 1130 security_xfrm_state_pol_flow_match(x, pol,
1131 &fl->u.__fl_common))
08ec9af1
DM		 1132 *error = -ESRCH;
1133 }
1134}
1135
1da177e4 1136struct xfrm_state *
33765d06 1137xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
b520e9f6 1138 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1da177e4 1139 struct xfrm_policy *pol, int *err,
bc56b334 1140 unsigned short family, u32 if_id)
1da177e4 1141{
08ec9af1 1142 static xfrm_address_t saddr_wildcard = { };
5447c5e4 1143 struct net *net = xp_net(pol);
6a783c90 1144 unsigned int h, h_wildcard;
37b08e34 1145 struct xfrm_state *x, *x0, *to_put;
1da177e4
LT		 1146 int acquire_in_progress = 0;
1147 int error = 0;
1148 struct xfrm_state *best = NULL;
bd55775c 1149 u32 mark = pol->mark.v & pol->mark.m;
8444cf71 1150 unsigned short encap_family = tmpl->encap_family;
b65e3d7b 1151 unsigned int sequence;
0f24558e 1152 struct km_event c;
a716c119 1153
37b08e34
DM		 1154 to_put = NULL;
1155
e88add19 1156 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
b65e3d7b 1157
d737a580 1158 rcu_read_lock();
8444cf71 1159 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
ae3fb6d3 1160 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
f8a70afa
LR		 1161#ifdef CONFIG_XFRM_OFFLOAD
1162 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1163 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1164 /* HW states are in the head of list, there is
1165 * no need to iterate further.
1166 */
1167 break;
1168
1169 /* Packet offload: both policy and SA should
1170 * have same device.
1171 */
1172 if (pol->xdo.dev != x->xso.dev)
1173 continue;
1174 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1175 /* Skip HW policy for SW lookups */
1176 continue;
1177#endif
8444cf71 1178 if (x->props.family == encap_family &&
1da177e4 1179 x->props.reqid == tmpl->reqid &&
3d6acfa7 1180 (mark & x->mark.m) == x->mark.v &&
7e652640 1181 x->if_id == if_id &&
fbd9a5b4 1182 !(x->props.flags & XFRM_STATE_WILDRECV) &&
8444cf71 1183 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1da177e4
LT		 1184 tmpl->mode == x->props.mode &&
1185 tmpl->id.proto == x->id.proto &&
08ec9af1 1186 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
e94ee171 1187 xfrm_state_look_at(pol, x, fl, family,
08ec9af1
DM		 1188 &best, &acquire_in_progress, &error);
1189 }
6f115638 1190 if (best || acquire_in_progress)
08ec9af1
DM		 1191 goto found;
1192
8444cf71 1193 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
ae3fb6d3 1194 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
f8a70afa
LR		 1195#ifdef CONFIG_XFRM_OFFLOAD
1196 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1197 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1198 /* HW states are in the head of list, there is
1199 * no need to iterate further.
1200 */
1201 break;
1202
1203 /* Packet offload: both policy and SA should
1204 * have same device.
1205 */
1206 if (pol->xdo.dev != x->xso.dev)
1207 continue;
1208 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1209 /* Skip HW policy for SW lookups */
1210 continue;
1211#endif
8444cf71 1212 if (x->props.family == encap_family &&
08ec9af1 1213 x->props.reqid == tmpl->reqid &&
3d6acfa7 1214 (mark & x->mark.m) == x->mark.v &&
7e652640 1215 x->if_id == if_id &&
08ec9af1 1216 !(x->props.flags & XFRM_STATE_WILDRECV) &&
f59bbdfa 1217 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
08ec9af1
DM		 1218 tmpl->mode == x->props.mode &&
1219 tmpl->id.proto == x->id.proto &&
1220 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
e94ee171 1221 xfrm_state_look_at(pol, x, fl, family,
08ec9af1 1222 &best, &acquire_in_progress, &error);
1da177e4
LT		 1223 }
1224
08ec9af1 1225found:
1da177e4
LT		 1226 x = best;
1227 if (!x && !error && !acquire_in_progress) {
5c5d281a 1228 if (tmpl->id.spi &&
f8a70afa
LR		 1229 (x0 = __xfrm_state_lookup_all(net, mark, daddr,
1230 tmpl->id.spi, tmpl->id.proto,
1231 encap_family,
1232 &pol->xdo)) != NULL) {
37b08e34 1233 to_put = x0;
1da177e4
LT		 1234 error = -EEXIST;
1235 goto out;
1236 }
0f24558e
HG		 1237
1238 c.net = net;
1239 /* If the KMs have no listeners (yet...), avoid allocating an SA
1240 * for each and every packet - garbage collection might not
1241 * handle the flood.
1242 */
1243 if (!km_is_alive(&c)) {
1244 error = -ESRCH;
1245 goto out;
1246 }
1247
5447c5e4 1248 x = xfrm_state_alloc(net);
1da177e4
LT		 1249 if (x == NULL) {
1250 error = -ENOMEM;
1251 goto out;
1252 }
8444cf71 1253 /* Initialize temporary state matching only
1da177e4 1254 * to current session. */
8444cf71 1255 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
bd55775c 1256 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
7e652640 1257 x->if_id = if_id;
1da177e4 1258
1d28f42c 1259 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
e0d1caa7
VY		 1260 if (error) {
1261 x->km.state = XFRM_STATE_DEAD;
37b08e34 1262 to_put = x;
e0d1caa7
VY		 1263 x = NULL;
1264 goto out;
1265 }
f8a70afa
LR		 1266#ifdef CONFIG_XFRM_OFFLOAD
1267 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1268 struct xfrm_dev_offload *xdo = &pol->xdo;
1269 struct xfrm_dev_offload *xso = &x->xso;
1270
1271 xso->type = XFRM_DEV_OFFLOAD_PACKET;
1272 xso->dir = xdo->dir;
1273 xso->dev = xdo->dev;
1274 xso->real_dev = xdo->real_dev;
e0aeb9b9 1275 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ;
f8a70afa
LR		 1276 netdev_tracker_alloc(xso->dev, &xso->dev_tracker,
1277 GFP_ATOMIC);
7681a4f5 1278 error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
f8a70afa
LR		 1279 if (error) {
1280 xso->dir = 0;
1281 netdev_put(xso->dev, &xso->dev_tracker);
1282 xso->dev = NULL;
1283 xso->real_dev = NULL;
1284 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1285 x->km.state = XFRM_STATE_DEAD;
1286 to_put = x;
1287 x = NULL;
1288 goto out;
1289 }
1290 }
1291#endif
1da177e4 1292 if (km_query(x, tmpl, pol) == 0) {
d737a580 1293 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1294 x->km.state = XFRM_STATE_ACQ;
5447c5e4 1295 list_add(&x->km.all, &net->xfrm.state_all);
3c611d40
LR		 1296 XFRM_STATE_INSERT(bydst, &x->bydst,
1297 net->xfrm.state_bydst + h,
1298 x->xso.type);
8444cf71 1299 h = xfrm_src_hash(net, daddr, saddr, encap_family);
3c611d40
LR		 1300 XFRM_STATE_INSERT(bysrc, &x->bysrc,
1301 net->xfrm.state_bysrc + h,
1302 x->xso.type);
1da177e4 1303 if (x->id.spi) {
8444cf71 1304 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
3c611d40
LR		 1305 XFRM_STATE_INSERT(byspi, &x->byspi,
1306 net->xfrm.state_byspi + h,
1307 x->xso.type);
1da177e4 1308 }
fe9f1d87
SD		 1309 if (x->km.seq) {
1310 h = xfrm_seq_hash(net, x->km.seq);
3c611d40
LR		 1311 XFRM_STATE_INSERT(byseq, &x->byseq,
1312 net->xfrm.state_byseq + h,
1313 x->xso.type);
fe9f1d87 1314 }
b27aeadb 1315 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
671422b2
TG		 1316 hrtimer_start(&x->mtimer,
1317 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1318 HRTIMER_MODE_REL_SOFT);
5447c5e4
AD		 1319 net->xfrm.state_num++;
1320 xfrm_hash_grow_check(net, x->bydst.next != NULL);
d737a580 1321 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1322 } else {
f8a70afa
LR		 1323#ifdef CONFIG_XFRM_OFFLOAD
1324 struct xfrm_dev_offload *xso = &x->xso;
1325
1326 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) {
f3ec2b5d
LR		 1327 xfrm_dev_state_delete(x);
1328 xfrm_dev_state_free(x);
f8a70afa
LR		 1329 }
1330#endif
1da177e4 1331 x->km.state = XFRM_STATE_DEAD;
37b08e34 1332 to_put = x;
1da177e4
LT		 1333 x = NULL;
1334 error = -ESRCH;
1335 }
1336 }
1337out:
02efdff7
FW		 1338 if (x) {
1339 if (!xfrm_state_hold_rcu(x)) {
1340 *err = -EAGAIN;
1341 x = NULL;
1342 }
1343 } else {
1da177e4 1344 *err = acquire_in_progress ? -EAGAIN : error;
02efdff7 1345 }
d737a580 1346 rcu_read_unlock();
37b08e34
DM		 1347 if (to_put)
1348 xfrm_state_put(to_put);
b65e3d7b 1349
e88add19 1350 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
b65e3d7b
FW		 1351 *err = -EAGAIN;
1352 if (x) {
1353 xfrm_state_put(x);
1354 x = NULL;
1355 }
1356 }
1357
1da177e4
LT		 1358 return x;
1359}
1360
628529b6 1361struct xfrm_state *
7e652640 1362xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
5447c5e4 1363 xfrm_address_t *daddr, xfrm_address_t *saddr,
628529b6
JHS		 1364 unsigned short family, u8 mode, u8 proto, u32 reqid)
1365{
4bda4f25 1366 unsigned int h;
628529b6 1367 struct xfrm_state *rx = NULL, *x = NULL;
628529b6 1368
4ae770bf 1369 spin_lock_bh(&net->xfrm.xfrm_state_lock);
5447c5e4 1370 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
b67bfe0d 1371 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
628529b6
JHS		 1372 if (x->props.family == family &&
1373 x->props.reqid == reqid &&
3d6acfa7 1374 (mark & x->mark.m) == x->mark.v &&
7e652640 1375 x->if_id == if_id &&
628529b6
JHS		 1376 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1377 xfrm_state_addr_check(x, daddr, saddr, family) &&
1378 mode == x->props.mode &&
1379 proto == x->id.proto &&
1380 x->km.state == XFRM_STATE_VALID) {
1381 rx = x;
1382 break;
1383 }
1384 }
1385
1386 if (rx)
1387 xfrm_state_hold(rx);
4ae770bf 1388 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
628529b6
JHS		 1389
1390
1391 return rx;
1392}
1393EXPORT_SYMBOL(xfrm_stateonly_find);
1394
c454997e
FD		 1395struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1396 unsigned short family)
1397{
1398 struct xfrm_state *x;
1399 struct xfrm_state_walk *w;
1400
1401 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1402 list_for_each_entry(w, &net->xfrm.state_all, all) {
1403 x = container_of(w, struct xfrm_state, km);
1404 if (x->props.family != family ||
1405 x->id.spi != spi)
1406 continue;
1407
c454997e 1408 xfrm_state_hold(x);
bdddbf69 1409 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
c454997e
FD		 1410 return x;
1411 }
1412 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1413 return NULL;
1414}
1415EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1416
1da177e4
LT		 1417static void __xfrm_state_insert(struct xfrm_state *x)
1418{
98806f75 1419 struct net *net = xs_net(x);
a624c108 1420 unsigned int h;
1da177e4 1421
98806f75 1422 list_add(&x->km.all, &net->xfrm.state_all);
4c563f76 1423
98806f75 1424 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
c1969f29 1425 x->props.reqid, x->props.family);
3c611d40
LR		 1426 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1427 x->xso.type);
1da177e4 1428
98806f75 1429 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
3c611d40
LR		 1430 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1431 x->xso.type);
1da177e4 1432
7b4dc360 1433 if (x->id.spi) {
98806f75 1434 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
6c44e6b7
MN		 1435 x->props.family);
1436
3c611d40
LR		 1437 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
1438 x->xso.type);
6c44e6b7
MN		 1439 }
1440
fe9f1d87
SD		 1441 if (x->km.seq) {
1442 h = xfrm_seq_hash(net, x->km.seq);
1443
3c611d40
LR		 1444 XFRM_STATE_INSERT(byseq, &x->byseq, net->xfrm.state_byseq + h,
1445 x->xso.type);
fe9f1d87
SD		 1446 }
1447
671422b2 1448 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
a47f0ce0
DM		 1449 if (x->replay_maxage)
1450 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
f8cd5488 1451
98806f75 1452 net->xfrm.state_num++;
f034b5d4 1453
98806f75 1454 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1da177e4
LT		 1455}
1456
283bc9f3 1457/* net->xfrm.xfrm_state_lock is held */
c7f5ea3a
DM		 1458static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1459{
98806f75 1460 struct net *net = xs_net(xnew);
c7f5ea3a
DM		 1461 unsigned short family = xnew->props.family;
1462 u32 reqid = xnew->props.reqid;
1463 struct xfrm_state *x;
c7f5ea3a 1464 unsigned int h;
3d6acfa7 1465 u32 mark = xnew->mark.v & xnew->mark.m;
7e652640 1466 u32 if_id = xnew->if_id;
c7f5ea3a 1467
98806f75 1468 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
b67bfe0d 1469 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
c7f5ea3a
DM		 1470 if (x->props.family == family &&
1471 x->props.reqid == reqid &&
7e652640 1472 x->if_id == if_id &&
3d6acfa7 1473 (mark & x->mark.m) == x->mark.v &&
70e94e66
YH		 1474 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1475 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
34996cb9 1476 x->genid++;
c7f5ea3a
DM		 1477 }
1478}
1479
1da177e4
LT		 1480void xfrm_state_insert(struct xfrm_state *x)
1481{
283bc9f3
FD		 1482 struct net *net = xs_net(x);
1483
1484 spin_lock_bh(&net->xfrm.xfrm_state_lock);
c7f5ea3a 1485 __xfrm_state_bump_genids(x);
1da177e4 1486 __xfrm_state_insert(x);
283bc9f3 1487 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 1488}
1489EXPORT_SYMBOL(xfrm_state_insert);
1490
283bc9f3 1491/* net->xfrm.xfrm_state_lock is held */
e473fcb4
MK		 1492static struct xfrm_state *__find_acq_core(struct net *net,
1493 const struct xfrm_mark *m,
a70486f0 1494 unsigned short family, u8 mode,
7e652640 1495 u32 reqid, u32 if_id, u8 proto,
a70486f0 1496 const xfrm_address_t *daddr,
e473fcb4
MK		 1497 const xfrm_address_t *saddr,
1498 int create)
2770834c 1499{
5447c5e4 1500 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
2770834c 1501 struct xfrm_state *x;
3d6acfa7 1502 u32 mark = m->v & m->m;
2770834c 1503
b67bfe0d 1504 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
2770834c
DM		 1505 if (x->props.reqid != reqid ||
1506 x->props.mode != mode ||
1507 x->props.family != family ||
1508 x->km.state != XFRM_STATE_ACQ ||
75e252d9 1509 x->id.spi != 0 ||
1802571b 1510 x->id.proto != proto ||
3d6acfa7 1511 (mark & x->mark.m) != x->mark.v ||
70e94e66
YH		 1512 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1513 !xfrm_addr_equal(&x->props.saddr, saddr, family))
2770834c
DM		 1514 continue;
1515
2770834c
DM		 1516 xfrm_state_hold(x);
1517 return x;
1518 }
1519
1520 if (!create)
1521 return NULL;
1522
5447c5e4 1523 x = xfrm_state_alloc(net);
2770834c
DM		 1524 if (likely(x)) {
1525 switch (family) {
1526 case AF_INET:
1527 x->sel.daddr.a4 = daddr->a4;
1528 x->sel.saddr.a4 = saddr->a4;
1529 x->sel.prefixlen_d = 32;
1530 x->sel.prefixlen_s = 32;
1531 x->props.saddr.a4 = saddr->a4;
1532 x->id.daddr.a4 = daddr->a4;
1533 break;
1534
1535 case AF_INET6:
15e318bd
JB		 1536 x->sel.daddr.in6 = daddr->in6;
1537 x->sel.saddr.in6 = saddr->in6;
2770834c
DM		 1538 x->sel.prefixlen_d = 128;
1539 x->sel.prefixlen_s = 128;
15e318bd
JB		 1540 x->props.saddr.in6 = saddr->in6;
1541 x->id.daddr.in6 = daddr->in6;
2770834c 1542 break;
3ff50b79 1543 }
2770834c
DM		 1544
1545 x->km.state = XFRM_STATE_ACQ;
1546 x->id.proto = proto;
1547 x->props.family = family;
1548 x->props.mode = mode;
1549 x->props.reqid = reqid;
7e652640 1550 x->if_id = if_id;
bd55775c
JHS		 1551 x->mark.v = m->v;
1552 x->mark.m = m->m;
b27aeadb 1553 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
2770834c 1554 xfrm_state_hold(x);
671422b2
TG		 1555 hrtimer_start(&x->mtimer,
1556 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1557 HRTIMER_MODE_REL_SOFT);
5447c5e4 1558 list_add(&x->km.all, &net->xfrm.state_all);
3c611d40
LR		 1559 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1560 x->xso.type);
5447c5e4 1561 h = xfrm_src_hash(net, daddr, saddr, family);
3c611d40
LR		 1562 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1563 x->xso.type);
918049f0 1564
5447c5e4 1565 net->xfrm.state_num++;
918049f0 1566
5447c5e4 1567 xfrm_hash_grow_check(net, x->bydst.next != NULL);
2770834c
DM		 1568 }
1569
1570 return x;
1571}
1572
bd55775c 1573static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1da177e4
LT		 1574
1575int xfrm_state_add(struct xfrm_state *x)
1576{
5447c5e4 1577 struct net *net = xs_net(x);
37b08e34 1578 struct xfrm_state *x1, *to_put;
1da177e4
LT		 1579 int family;
1580 int err;
bd55775c 1581 u32 mark = x->mark.v & x->mark.m;
eb2971b6 1582 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1da177e4
LT		 1583
1584 family = x->props.family;
1da177e4 1585
37b08e34
DM		 1586 to_put = NULL;
1587
283bc9f3 1588 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1589
edcd5821 1590 x1 = __xfrm_state_locate(x, use_spi, family);
1da177e4 1591 if (x1) {
37b08e34 1592 to_put = x1;
1da177e4
LT		 1593 x1 = NULL;
1594 err = -EEXIST;
1595 goto out;
1596 }
1597
eb2971b6 1598 if (use_spi && x->km.seq) {
bd55775c 1599 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
75e252d9 1600 if (x1 && ((x1->id.proto != x->id.proto) ||
70e94e66 1601 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
37b08e34 1602 to_put = x1;
1da177e4
LT		 1603 x1 = NULL;
1604 }
1605 }
1606
eb2971b6 1607 if (use_spi && !x1)
bd55775c 1608 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
7e652640 1609 x->props.reqid, x->if_id, x->id.proto,
2770834c 1610 &x->id.daddr, &x->props.saddr, 0);
1da177e4 1611
c7f5ea3a 1612 __xfrm_state_bump_genids(x);
1da177e4
LT		 1613 __xfrm_state_insert(x);
1614 err = 0;
1615
1616out:
283bc9f3 1617 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 1618
1619 if (x1) {
1620 xfrm_state_delete(x1);
1621 xfrm_state_put(x1);
1622 }
1623
37b08e34
DM		 1624 if (to_put)
1625 xfrm_state_put(to_put);
1626
1da177e4
LT		 1627 return err;
1628}
1629EXPORT_SYMBOL(xfrm_state_add);
1630
80c9abaa 1631#ifdef CONFIG_XFRM_MIGRATE
7aa05d30
AA		 1632static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1633{
1634 struct xfrm_user_sec_ctx *uctx;
1635 int size = sizeof(*uctx) + security->ctx_len;
1636 int err;
1637
1638 uctx = kmalloc(size, GFP_KERNEL);
1639 if (!uctx)
1640 return -ENOMEM;
1641
1642 uctx->exttype = XFRMA_SEC_CTX;
1643 uctx->len = size;
1644 uctx->ctx_doi = security->ctx_doi;
1645 uctx->ctx_alg = security->ctx_alg;
1646 uctx->ctx_len = security->ctx_len;
1647 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1648 err = security_xfrm_state_alloc(x, uctx);
1649 kfree(uctx);
1650 if (err)
1651 return err;
1652
1653 return 0;
1654}
1655
4ab47d47
AA		 1656static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1657 struct xfrm_encap_tmpl *encap)
80c9abaa 1658{
98806f75 1659 struct net *net = xs_net(orig);
98806f75 1660 struct xfrm_state *x = xfrm_state_alloc(net);
80c9abaa 1661 if (!x)
553f9118 1662 goto out;
80c9abaa
SS		 1663
1664 memcpy(&x->id, &orig->id, sizeof(x->id));
1665 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1666 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1667 x->props.mode = orig->props.mode;
1668 x->props.replay_window = orig->props.replay_window;
1669 x->props.reqid = orig->props.reqid;
1670 x->props.family = orig->props.family;
1671 x->props.saddr = orig->props.saddr;
1672
1673 if (orig->aalg) {
4447bb33 1674 x->aalg = xfrm_algo_auth_clone(orig->aalg);
80c9abaa
SS		 1675 if (!x->aalg)
1676 goto error;
1677 }
1678 x->props.aalgo = orig->props.aalgo;
1679
ee5c2317
SK		 1680 if (orig->aead) {
1681 x->aead = xfrm_algo_aead_clone(orig->aead);
75bf50f4 1682 x->geniv = orig->geniv;
ee5c2317
SK		 1683 if (!x->aead)
1684 goto error;
1685 }
80c9abaa
SS		 1686 if (orig->ealg) {
1687 x->ealg = xfrm_algo_clone(orig->ealg);
1688 if (!x->ealg)
1689 goto error;
1690 }
1691 x->props.ealgo = orig->props.ealgo;
1692
1693 if (orig->calg) {
1694 x->calg = xfrm_algo_clone(orig->calg);
1695 if (!x->calg)
1696 goto error;
1697 }
1698 x->props.calgo = orig->props.calgo;
1699
4ab47d47
AA		 1700 if (encap || orig->encap) {
1701 if (encap)
1702 x->encap = kmemdup(encap, sizeof(*x->encap),
1703 GFP_KERNEL);
1704 else
1705 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1706 GFP_KERNEL);
1707
80c9abaa
SS		 1708 if (!x->encap)
1709 goto error;
1710 }
1711
7aa05d30
AA		 1712 if (orig->security)
1713 if (clone_security(x, orig->security))
1714 goto error;
1715
80c9abaa
SS		 1716 if (orig->coaddr) {
1717 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1718 GFP_KERNEL);
1719 if (!x->coaddr)
1720 goto error;
1721 }
1722
af2f464e 1723 if (orig->replay_esn) {
cc9ab60e 1724 if (xfrm_replay_clone(x, orig))
af2f464e
SK		 1725 goto error;
1726 }
1727
bd55775c 1728 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
545e5c57 1729 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
bd55775c 1730
80c9abaa 1731 x->props.flags = orig->props.flags;
a947b0a9 1732 x->props.extra_flags = orig->props.extra_flags;
80c9abaa 1733
7e652640 1734 x->if_id = orig->if_id;
ee5c2317
SK		 1735 x->tfcpad = orig->tfcpad;
1736 x->replay_maxdiff = orig->replay_maxdiff;
1737 x->replay_maxage = orig->replay_maxage;
8366685b 1738 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
80c9abaa
SS		 1739 x->km.state = orig->km.state;
1740 x->km.seq = orig->km.seq;
a486cd23
AA		 1741 x->replay = orig->replay;
1742 x->preplay = orig->preplay;
4e484b3e 1743 x->mapping_maxage = orig->mapping_maxage;
6aa811ac 1744 x->lastused = orig->lastused;
4e484b3e
AA		 1745 x->new_mapping = 0;
1746 x->new_mapping_sport = 0;
80c9abaa
SS		 1747
1748 return x;
1749
1750 error:
553f9118
HX		 1751 xfrm_state_put(x);
1752out:
80c9abaa
SS		 1753 return NULL;
1754}
80c9abaa 1755
c1aca308
YY		 1756struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1757 u32 if_id)
80c9abaa
SS		 1758{
1759 unsigned int h;
8c0cba22
SK		 1760 struct xfrm_state *x = NULL;
1761
1762 spin_lock_bh(&net->xfrm.xfrm_state_lock);
80c9abaa
SS		 1763
1764 if (m->reqid) {
283bc9f3 1765 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
80c9abaa 1766 m->reqid, m->old_family);
283bc9f3 1767 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
80c9abaa
SS		 1768 if (x->props.mode != m->mode ||
1769 x->id.proto != m->proto)
1770 continue;
1771 if (m->reqid && x->props.reqid != m->reqid)
1772 continue;
c1aca308
YY		 1773 if (if_id != 0 && x->if_id != if_id)
1774 continue;
70e94e66
YH		 1775 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1776 m->old_family) ||
1777 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1778 m->old_family))
80c9abaa
SS		 1779 continue;
1780 xfrm_state_hold(x);
8c0cba22 1781 break;
80c9abaa
SS		 1782 }
1783 } else {
283bc9f3 1784 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
80c9abaa 1785 m->old_family);
283bc9f3 1786 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
80c9abaa
SS		 1787 if (x->props.mode != m->mode ||
1788 x->id.proto != m->proto)
1789 continue;
c1aca308
YY		 1790 if (if_id != 0 && x->if_id != if_id)
1791 continue;
70e94e66
YH		 1792 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1793 m->old_family) ||
1794 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1795 m->old_family))
80c9abaa
SS		 1796 continue;
1797 xfrm_state_hold(x);
8c0cba22 1798 break;
80c9abaa
SS		 1799 }
1800 }
1801
8c0cba22
SK		 1802 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1803
1804 return x;
80c9abaa
SS		 1805}
1806EXPORT_SYMBOL(xfrm_migrate_state_find);
1807
3e94c2dc 1808struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
4ab47d47
AA		 1809 struct xfrm_migrate *m,
1810 struct xfrm_encap_tmpl *encap)
80c9abaa
SS		 1811{
1812 struct xfrm_state *xc;
80c9abaa 1813
4ab47d47 1814 xc = xfrm_state_clone(x, encap);
80c9abaa
SS		 1815 if (!xc)
1816 return NULL;
1817
e03c3bba
YY		 1818 xc->props.family = m->new_family;
1819
1820 if (xfrm_init_state(xc) < 0)
1821 goto error;
1822
80c9abaa
SS		 1823 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1824 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1825
1826 /* add state */
70e94e66 1827 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
80c9abaa
SS		 1828 /* a care is needed when the destination address of the
1829 state is to be updated as it is a part of triplet */
1830 xfrm_state_insert(xc);
1831 } else {
cc9ab60e 1832 if (xfrm_state_add(xc) < 0)
80c9abaa
SS		 1833 goto error;
1834 }
1835
1836 return xc;
1837error:
78347c8c 1838 xfrm_state_put(xc);
80c9abaa
SS		 1839 return NULL;
1840}
1841EXPORT_SYMBOL(xfrm_state_migrate);
1842#endif
1843
1da177e4
LT		 1844int xfrm_state_update(struct xfrm_state *x)
1845{
37b08e34 1846 struct xfrm_state *x1, *to_put;
1da177e4 1847 int err;
eb2971b6 1848 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
283bc9f3 1849 struct net *net = xs_net(x);
1da177e4 1850
37b08e34
DM		 1851 to_put = NULL;
1852
283bc9f3 1853 spin_lock_bh(&net->xfrm.xfrm_state_lock);
edcd5821 1854 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1da177e4
LT		 1855
1856 err = -ESRCH;
1857 if (!x1)
1858 goto out;
1859
1860 if (xfrm_state_kern(x1)) {
37b08e34 1861 to_put = x1;
1da177e4
LT		 1862 err = -EEXIST;
1863 goto out;
1864 }
1865
1866 if (x1->km.state == XFRM_STATE_ACQ) {
1867 __xfrm_state_insert(x);
1868 x = NULL;
1869 }
1870 err = 0;
1871
1872out:
283bc9f3 1873 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4 1874
37b08e34
DM		 1875 if (to_put)
1876 xfrm_state_put(to_put);
1877
1da177e4
LT		 1878 if (err)
1879 return err;
1880
1881 if (!x) {
1882 xfrm_state_delete(x1);
1883 xfrm_state_put(x1);
1884 return 0;
1885 }
1886
1887 err = -EINVAL;
1888 spin_lock_bh(&x1->lock);
1889 if (likely(x1->km.state == XFRM_STATE_VALID)) {
257a4b01
HX		 1890 if (x->encap && x1->encap &&
1891 x->encap->encap_type == x1->encap->encap_type)
1da177e4 1892 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
257a4b01
HX		 1893 else if (x->encap || x1->encap)
1894 goto fail;
1895
060f02a3
NT		 1896 if (x->coaddr && x1->coaddr) {
1897 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1898 }
1899 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1900 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1da177e4
LT		 1901 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1902 x1->km.dying = 0;
1903
671422b2
TG		 1904 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1905 HRTIMER_MODE_REL_SOFT);
0a9e5794 1906 if (READ_ONCE(x1->curlft.use_time))
1da177e4
LT		 1907 xfrm_state_check_expire(x1);
1908
5baf4f9c 1909 if (x->props.smark.m || x->props.smark.v || x->if_id) {
6d8e85ff
NH		 1910 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1911
5baf4f9c
NH		 1912 if (x->props.smark.m || x->props.smark.v)
1913 x1->props.smark = x->props.smark;
1914
1915 if (x->if_id)
1916 x1->if_id = x->if_id;
6d8e85ff
NH		 1917
1918 __xfrm_state_bump_genids(x1);
1919 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1920 }
1921
1da177e4 1922 err = 0;
8fcbc637
TG		 1923 x->km.state = XFRM_STATE_DEAD;
1924 __xfrm_state_put(x);
1da177e4 1925 }
257a4b01
HX		 1926
1927fail:
1da177e4
LT		 1928 spin_unlock_bh(&x1->lock);
1929
1930 xfrm_state_put(x1);
1931
1932 return err;
1933}
1934EXPORT_SYMBOL(xfrm_state_update);
1935
1936int xfrm_state_check_expire(struct xfrm_state *x)
1937{
f3da86dc
LR		 1938 xfrm_dev_state_update_curlft(x);
1939
0a9e5794
ED		 1940 if (!READ_ONCE(x->curlft.use_time))
1941 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds());
1da177e4 1942
1da177e4
LT		 1943 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1944 x->curlft.packets >= x->lft.hard_packet_limit) {
4666faab 1945 x->km.state = XFRM_STATE_EXPIRED;
671422b2 1946 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1da177e4
LT		 1947 return -EINVAL;
1948 }
1949
1950 if (!x->km.dying &&
1951 (x->curlft.bytes >= x->lft.soft_byte_limit ||
4666faab
HX		 1952 x->curlft.packets >= x->lft.soft_packet_limit)) {
1953 x->km.dying = 1;
53bc6b4d 1954 km_state_expired(x, 0, 0);
4666faab 1955 }
1da177e4
LT		 1956 return 0;
1957}
1958EXPORT_SYMBOL(xfrm_state_check_expire);
1959
1da177e4 1960struct xfrm_state *
a70486f0 1961xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
bd55775c 1962 u8 proto, unsigned short family)
1da177e4
LT		 1963{
1964 struct xfrm_state *x;
1da177e4 1965
c2f672fc 1966 rcu_read_lock();
bd55775c 1967 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
c2f672fc 1968 rcu_read_unlock();
1da177e4
LT		 1969 return x;
1970}
1971EXPORT_SYMBOL(xfrm_state_lookup);
1972
1973struct xfrm_state *
bd55775c 1974xfrm_state_lookup_byaddr(struct net *net, u32 mark,
a70486f0 1975 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
eb2971b6
MN		 1976 u8 proto, unsigned short family)
1977{
1978 struct xfrm_state *x;
eb2971b6 1979
283bc9f3 1980 spin_lock_bh(&net->xfrm.xfrm_state_lock);
bd55775c 1981 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
283bc9f3 1982 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
eb2971b6
MN		 1983 return x;
1984}
1985EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1986
1987struct xfrm_state *
e473fcb4 1988xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
7e652640 1989 u32 if_id, u8 proto, const xfrm_address_t *daddr,
e473fcb4 1990 const xfrm_address_t *saddr, int create, unsigned short family)
1da177e4
LT		 1991{
1992 struct xfrm_state *x;
1da177e4 1993
283bc9f3 1994 spin_lock_bh(&net->xfrm.xfrm_state_lock);
7e652640 1995 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
283bc9f3 1996 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2770834c 1997
1da177e4
LT		 1998 return x;
1999}
2000EXPORT_SYMBOL(xfrm_find_acq);
2001
41a49cc3 2002#ifdef CONFIG_XFRM_SUB_POLICY
3aaf3915
FW		 2003#if IS_ENABLED(CONFIG_IPV6)
2004/* distribution counting sort function for xfrm_state and xfrm_tmpl */
2005static void
2006__xfrm6_sort(void **dst, void **src, int n,
2007 int (*cmp)(const void *p), int maxclass)
2008{
2009 int count[XFRM_MAX_DEPTH] = { };
2010 int class[XFRM_MAX_DEPTH];
2011 int i;
2012
2013 for (i = 0; i < n; i++) {
2014 int c = cmp(src[i]);
2015
2016 class[i] = c;
2017 count[c]++;
2018 }
2019
2020 for (i = 2; i < maxclass; i++)
2021 count[i] += count[i - 1];
2022
2023 for (i = 0; i < n; i++) {
2024 dst[count[class[i] - 1]++] = src[i];
2025 src[i] = NULL;
2026 }
2027}
2028
2029/* Rule for xfrm_state:
2030 *
2031 * rule 1: select IPsec transport except AH
2032 * rule 2: select MIPv6 RO or inbound trigger
2033 * rule 3: select IPsec transport AH
2034 * rule 4: select IPsec tunnel
2035 * rule 5: others
2036 */
2037static int __xfrm6_state_sort_cmp(const void *p)
2038{
2039 const struct xfrm_state *v = p;
2040
2041 switch (v->props.mode) {
2042 case XFRM_MODE_TRANSPORT:
2043 if (v->id.proto != IPPROTO_AH)
2044 return 1;
2045 else
2046 return 3;
2047#if IS_ENABLED(CONFIG_IPV6_MIP6)
2048 case XFRM_MODE_ROUTEOPTIMIZATION:
2049 case XFRM_MODE_IN_TRIGGER:
2050 return 2;
2051#endif
2052 case XFRM_MODE_TUNNEL:
2053 case XFRM_MODE_BEET:
2054 return 4;
2055 }
2056 return 5;
2057}
2058
2059/* Rule for xfrm_tmpl:
2060 *
2061 * rule 1: select IPsec transport
2062 * rule 2: select MIPv6 RO or inbound trigger
2063 * rule 3: select IPsec tunnel
2064 * rule 4: others
2065 */
2066static int __xfrm6_tmpl_sort_cmp(const void *p)
2067{
2068 const struct xfrm_tmpl *v = p;
2069
2070 switch (v->mode) {
2071 case XFRM_MODE_TRANSPORT:
2072 return 1;
2073#if IS_ENABLED(CONFIG_IPV6_MIP6)
2074 case XFRM_MODE_ROUTEOPTIMIZATION:
2075 case XFRM_MODE_IN_TRIGGER:
2076 return 2;
2077#endif
2078 case XFRM_MODE_TUNNEL:
2079 case XFRM_MODE_BEET:
2080 return 3;
2081 }
2082 return 4;
2083}
2084#else
2085static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
2086static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
2087
2088static inline void
2089__xfrm6_sort(void **dst, void **src, int n,
2090 int (*cmp)(const void *p), int maxclass)
2091{
2092 int i;
2093
2094 for (i = 0; i < n; i++)
2095 dst[i] = src[i];
2096}
2097#endif /* CONFIG_IPV6 */
2098
2099void
41a49cc3 2100xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
3aaf3915 2101 unsigned short family)
41a49cc3 2102{
3f5a95ad 2103 int i;
41a49cc3 2104
3aaf3915
FW		 2105 if (family == AF_INET6)
2106 __xfrm6_sort((void **)dst, (void **)src, n,
2107 __xfrm6_tmpl_sort_cmp, 5);
3f5a95ad
KD		 2108 else
2109 for (i = 0; i < n; i++)
2110 dst[i] = src[i];
41a49cc3 2111}
41a49cc3 2112
3aaf3915 2113void
41a49cc3
MN		 2114xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
2115 unsigned short family)
2116{
3f5a95ad 2117 int i;
283bc9f3 2118
3aaf3915
FW		 2119 if (family == AF_INET6)
2120 __xfrm6_sort((void **)dst, (void **)src, n,
2121 __xfrm6_state_sort_cmp, 6);
3f5a95ad
KD		 2122 else
2123 for (i = 0; i < n; i++)
2124 dst[i] = src[i];
41a49cc3 2125}
41a49cc3
MN		 2126#endif
2127
1da177e4
LT		 2128/* Silly enough, but I'm lazy to build resolution list */
2129
bd55775c 2130static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1da177e4 2131{
fe9f1d87
SD		 2132 unsigned int h = xfrm_seq_hash(net, seq);
2133 struct xfrm_state *x;
8f126e37 2134
fe9f1d87
SD		 2135 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
2136 if (x->km.seq == seq &&
2137 (mark & x->mark.m) == x->mark.v &&
2138 x->km.state == XFRM_STATE_ACQ) {
2139 xfrm_state_hold(x);
2140 return x;
1da177e4
LT		 2141 }
2142 }
fe9f1d87 2143
1da177e4
LT		 2144 return NULL;
2145}
2146
bd55775c 2147struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1da177e4
LT		 2148{
2149 struct xfrm_state *x;
2150
283bc9f3 2151 spin_lock_bh(&net->xfrm.xfrm_state_lock);
bd55775c 2152 x = __xfrm_find_acq_byseq(net, mark, seq);
283bc9f3 2153 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 2154 return x;
2155}
2156EXPORT_SYMBOL(xfrm_find_acq_byseq);
2157
2158u32 xfrm_get_acqseq(void)
2159{
2160 u32 res;
6836b9bd 2161 static atomic_t acqseq;
2162
2163 do {
2164 res = atomic_inc_return(&acqseq);
2165 } while (!res);
1da177e4 2166
1da177e4
LT		 2167 return res;
2168}
2169EXPORT_SYMBOL(xfrm_get_acqseq);
2170
c2dad11e 2171int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
776e9dd9
FD		 2172{
2173 switch (proto) {
2174 case IPPROTO_AH:
2175 case IPPROTO_ESP:
2176 break;
2177
2178 case IPPROTO_COMP:
2179 /* IPCOMP spi is 16-bits. */
c2dad11e
SD		 2180 if (max >= 0x10000) {
2181 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
776e9dd9 2182 return -EINVAL;
c2dad11e 2183 }
776e9dd9
FD		 2184 break;
2185
2186 default:
c2dad11e 2187 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
776e9dd9
FD		 2188 return -EINVAL;
2189 }
2190
c2dad11e
SD		 2191 if (min > max) {
2192 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
776e9dd9 2193 return -EINVAL;
c2dad11e 2194 }
776e9dd9
FD		 2195
2196 return 0;
2197}
2198EXPORT_SYMBOL(verify_spi_info);
2199
c2dad11e
SD		 2200int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
2201 struct netlink_ext_ack *extack)
1da177e4 2202{
221df1ed 2203 struct net *net = xs_net(x);
f034b5d4 2204 unsigned int h;
1da177e4 2205 struct xfrm_state *x0;
658b219e
HX		 2206 int err = -ENOENT;
2207 __be32 minspi = htonl(low);
2208 __be32 maxspi = htonl(high);
a779d913 2209 __be32 newspi = 0;
bd55775c 2210 u32 mark = x->mark.v & x->mark.m;
1da177e4 2211
658b219e 2212 spin_lock_bh(&x->lock);
c2dad11e
SD		 2213 if (x->km.state == XFRM_STATE_DEAD) {
2214 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
658b219e 2215 goto unlock;
c2dad11e 2216 }
658b219e
HX		 2217
2218 err = 0;
1da177e4 2219 if (x->id.spi)
658b219e
HX		 2220 goto unlock;
2221
2222 err = -ENOENT;
1da177e4
LT		 2223
2224 if (minspi == maxspi) {
bd55775c 2225 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1da177e4 2226 if (x0) {
c2dad11e 2227 NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
1da177e4 2228 xfrm_state_put(x0);
658b219e 2229 goto unlock;
1da177e4 2230 }
a779d913 2231 newspi = minspi;
1da177e4
LT		 2232 } else {
2233 u32 spi = 0;
9b7a787d 2234 for (h = 0; h < high-low+1; h++) {
e8a533cb 2235 spi = get_random_u32_inclusive(low, high);
bd55775c 2236 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1da177e4 2237 if (x0 == NULL) {
a779d913 2238 newspi = htonl(spi);
1da177e4
LT		 2239 break;
2240 }
2241 xfrm_state_put(x0);
2242 }
2243 }
a779d913 2244 if (newspi) {
283bc9f3 2245 spin_lock_bh(&net->xfrm.xfrm_state_lock);
a779d913 2246 x->id.spi = newspi;
12604d8a 2247 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
3c611d40
LR		 2248 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
2249 x->xso.type);
283bc9f3 2250 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
658b219e
HX		 2251
2252 err = 0;
c2dad11e
SD		 2253 } else {
2254 NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
1da177e4 2255 }
658b219e
HX		 2256
2257unlock:
2258 spin_unlock_bh(&x->lock);
2259
2260 return err;
1da177e4
LT		 2261}
2262EXPORT_SYMBOL(xfrm_alloc_spi);
2263
d3623099 2264static bool __xfrm_state_filter_match(struct xfrm_state *x,
870a2df4 2265 struct xfrm_address_filter *filter)
d3623099
ND		 2266{
2267 if (filter) {
2268 if ((filter->family == AF_INET ||
2269 filter->family == AF_INET6) &&
2270 x->props.family != filter->family)
2271 return false;
2272
2273 return addr_match(&x->props.saddr, &filter->saddr,
2274 filter->splen) &&
2275 addr_match(&x->id.daddr, &filter->daddr,
2276 filter->dplen);
2277 }
2278 return true;
2279}
2280
284fa7da 2281int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
4c563f76 2282 int (*func)(struct xfrm_state *, int, void*),
1da177e4
LT		 2283 void *data)
2284{
12a169e7
HX		 2285 struct xfrm_state *state;
2286 struct xfrm_state_walk *x;
1da177e4
LT		 2287 int err = 0;
2288
12a169e7 2289 if (walk->seq != 0 && list_empty(&walk->all))
4c563f76
TT		 2290 return 0;
2291
283bc9f3 2292 spin_lock_bh(&net->xfrm.xfrm_state_lock);
12a169e7 2293 if (list_empty(&walk->all))
284fa7da 2294 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
12a169e7 2295 else
80077702 2296 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
284fa7da 2297 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
12a169e7 2298 if (x->state == XFRM_STATE_DEAD)
4c563f76 2299 continue;
12a169e7
HX		 2300 state = container_of(x, struct xfrm_state, km);
2301 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
4c563f76 2302 continue;
d3623099
ND		 2303 if (!__xfrm_state_filter_match(state, walk->filter))
2304 continue;
12a169e7
HX		 2305 err = func(state, walk->seq, data);
2306 if (err) {
2307 list_move_tail(&walk->all, &x->all);
2308 goto out;
1da177e4 2309 }
12a169e7 2310 walk->seq++;
1da177e4 2311 }
12a169e7 2312 if (walk->seq == 0) {
1da177e4
LT		 2313 err = -ENOENT;
2314 goto out;
2315 }
12a169e7 2316 list_del_init(&walk->all);
1da177e4 2317out:
283bc9f3 2318 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1da177e4
LT		 2319 return err;
2320}
2321EXPORT_SYMBOL(xfrm_state_walk);
2322
d3623099 2323void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
870a2df4 2324 struct xfrm_address_filter *filter)
5c182458 2325{
12a169e7 2326 INIT_LIST_HEAD(&walk->all);
5c182458 2327 walk->proto = proto;
12a169e7
HX		 2328 walk->state = XFRM_STATE_DEAD;
2329 walk->seq = 0;
d3623099 2330 walk->filter = filter;
5c182458
HX		 2331}
2332EXPORT_SYMBOL(xfrm_state_walk_init);
2333
283bc9f3 2334void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
abb81c4f 2335{
d3623099
ND		 2336 kfree(walk->filter);
2337
12a169e7 2338 if (list_empty(&walk->all))
5c182458 2339 return;
5c182458 2340
283bc9f3 2341 spin_lock_bh(&net->xfrm.xfrm_state_lock);
12a169e7 2342 list_del(&walk->all);
283bc9f3 2343 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
abb81c4f
HX		 2344}
2345EXPORT_SYMBOL(xfrm_state_walk_done);
2346
e99e88a9 2347static void xfrm_replay_timer_handler(struct timer_list *t)
f8cd5488 2348{
e99e88a9 2349 struct xfrm_state *x = from_timer(x, t, rtimer);
f8cd5488
JHS		 2350
2351 spin_lock(&x->lock);
2352
2717096a 2353 if (x->km.state == XFRM_STATE_VALID) {
a6483b79 2354 if (xfrm_aevent_is_on(xs_net(x)))
cfc61c59 2355 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2717096a
JHS		 2356 else
2357 x->xflags |= XFRM_TIME_DEFER;
2358 }
f8cd5488
JHS		 2359
2360 spin_unlock(&x->lock);
2361}
2362
df01812e 2363static LIST_HEAD(xfrm_km_list);
1da177e4 2364
214e005b 2365void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4
LT		 2366{
2367 struct xfrm_mgr *km;
2368
85168c00
CW		 2369 rcu_read_lock();
2370 list_for_each_entry_rcu(km, &xfrm_km_list, list)
26b15dad
JHS		 2371 if (km->notify_policy)
2372 km->notify_policy(xp, dir, c);
85168c00 2373 rcu_read_unlock();
26b15dad 2374}
1da177e4 2375
214e005b 2376void km_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2377{
2378 struct xfrm_mgr *km;
85168c00
CW		 2379 rcu_read_lock();
2380 list_for_each_entry_rcu(km, &xfrm_km_list, list)
26b15dad
JHS		 2381 if (km->notify)
2382 km->notify(x, c);
85168c00 2383 rcu_read_unlock();
26b15dad
JHS		 2384}
2385
2386EXPORT_SYMBOL(km_policy_notify);
2387EXPORT_SYMBOL(km_state_notify);
2388
15e47304 2389void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
26b15dad
JHS		 2390{
2391 struct km_event c;
2392
bf08867f 2393 c.data.hard = hard;
15e47304 2394 c.portid = portid;
f60f6b8f 2395 c.event = XFRM_MSG_EXPIRE;
26b15dad 2396 km_state_notify(x, &c);
1da177e4
LT		 2397}
2398
53bc6b4d 2399EXPORT_SYMBOL(km_state_expired);
26b15dad
JHS		 2400/*
2401 * We send to all registered managers regardless of failure
2402 * We are happy with one success
2403*/
980ebd25 2404int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1da177e4 2405{
26b15dad 2406 int err = -EINVAL, acqret;
1da177e4
LT		 2407 struct xfrm_mgr *km;
2408
85168c00
CW		 2409 rcu_read_lock();
2410 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
65e0736b 2411 acqret = km->acquire(x, t, pol);
26b15dad
JHS		 2412 if (!acqret)
2413 err = acqret;
1da177e4 2414 }
85168c00 2415 rcu_read_unlock();
1da177e4
LT		 2416 return err;
2417}
980ebd25 2418EXPORT_SYMBOL(km_query);
1da177e4 2419
4e484b3e 2420static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1da177e4
LT		 2421{
2422 int err = -EINVAL;
2423 struct xfrm_mgr *km;
2424
85168c00
CW		 2425 rcu_read_lock();
2426 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1da177e4
LT		 2427 if (km->new_mapping)
2428 err = km->new_mapping(x, ipaddr, sport);
2429 if (!err)
2430 break;
2431 }
85168c00 2432 rcu_read_unlock();
1da177e4
LT		 2433 return err;
2434}
4e484b3e
AA		 2435
2436int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2437{
2438 int ret = 0;
2439
2440 if (x->mapping_maxage) {
2441 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2442 x->new_mapping_sport != sport) {
2443 x->new_mapping_sport = sport;
2444 x->new_mapping = jiffies / HZ;
2445 ret = __km_new_mapping(x, ipaddr, sport);
2446 }
2447 } else {
2448 ret = __km_new_mapping(x, ipaddr, sport);
2449 }
2450
2451 return ret;
2452}
1da177e4
LT		 2453EXPORT_SYMBOL(km_new_mapping);
2454
15e47304 2455void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1da177e4 2456{
26b15dad 2457 struct km_event c;
1da177e4 2458
bf08867f 2459 c.data.hard = hard;
15e47304 2460 c.portid = portid;
f60f6b8f 2461 c.event = XFRM_MSG_POLEXPIRE;
26b15dad 2462 km_policy_notify(pol, dir, &c);
1da177e4 2463}
a70fcb0b 2464EXPORT_SYMBOL(km_policy_expired);
1da177e4 2465
2d60abc2 2466#ifdef CONFIG_XFRM_MIGRATE
183cad12
DM		 2467int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2468 const struct xfrm_migrate *m, int num_migrate,
8bafd730
AA		 2469 const struct xfrm_kmaddress *k,
2470 const struct xfrm_encap_tmpl *encap)
80c9abaa
SS		 2471{
2472 int err = -EINVAL;
2473 int ret;
2474 struct xfrm_mgr *km;
2475
85168c00
CW		 2476 rcu_read_lock();
2477 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
80c9abaa 2478 if (km->migrate) {
8bafd730
AA		 2479 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2480 encap);
80c9abaa
SS		 2481 if (!ret)
2482 err = ret;
2483 }
2484 }
85168c00 2485 rcu_read_unlock();
80c9abaa
SS		 2486 return err;
2487}
2488EXPORT_SYMBOL(km_migrate);
2d60abc2 2489#endif
80c9abaa 2490
db983c11 2491int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2492{
2493 int err = -EINVAL;
2494 int ret;
2495 struct xfrm_mgr *km;
2496
85168c00
CW		 2497 rcu_read_lock();
2498 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
97a64b45 2499 if (km->report) {
db983c11 2500 ret = km->report(net, proto, sel, addr);
97a64b45
MN		 2501 if (!ret)
2502 err = ret;
2503 }
2504 }
85168c00 2505 rcu_read_unlock();
97a64b45
MN		 2506 return err;
2507}
2508EXPORT_SYMBOL(km_report);
2509
bb9cd077 2510static bool km_is_alive(const struct km_event *c)
0f24558e
HG		 2511{
2512 struct xfrm_mgr *km;
2513 bool is_alive = false;
2514
2515 rcu_read_lock();
2516 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2517 if (km->is_alive && km->is_alive(c)) {
2518 is_alive = true;
2519 break;
2520 }
2521 }
2522 rcu_read_unlock();
2523
2524 return is_alive;
2525}
0f24558e 2526
c9e7c76d
DS		 2527#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2528static DEFINE_SPINLOCK(xfrm_translator_lock);
2529static struct xfrm_translator __rcu *xfrm_translator;
2530
2531struct xfrm_translator *xfrm_get_translator(void)
2532{
2533 struct xfrm_translator *xtr;
2534
2535 rcu_read_lock();
2536 xtr = rcu_dereference(xfrm_translator);
2537 if (unlikely(!xtr))
2538 goto out;
2539 if (!try_module_get(xtr->owner))
2540 xtr = NULL;
2541out:
2542 rcu_read_unlock();
2543 return xtr;
2544}
2545EXPORT_SYMBOL_GPL(xfrm_get_translator);
2546
2547void xfrm_put_translator(struct xfrm_translator *xtr)
2548{
2549 module_put(xtr->owner);
2550}
2551EXPORT_SYMBOL_GPL(xfrm_put_translator);
2552
2553int xfrm_register_translator(struct xfrm_translator *xtr)
2554{
2555 int err = 0;
2556
2557 spin_lock_bh(&xfrm_translator_lock);
2558 if (unlikely(xfrm_translator != NULL))
2559 err = -EEXIST;
2560 else
2561 rcu_assign_pointer(xfrm_translator, xtr);
2562 spin_unlock_bh(&xfrm_translator_lock);
2563
2564 return err;
2565}
2566EXPORT_SYMBOL_GPL(xfrm_register_translator);
2567
2568int xfrm_unregister_translator(struct xfrm_translator *xtr)
2569{
2570 int err = 0;
2571
2572 spin_lock_bh(&xfrm_translator_lock);
2573 if (likely(xfrm_translator != NULL)) {
2574 if (rcu_access_pointer(xfrm_translator) != xtr)
2575 err = -EINVAL;
2576 else
2577 RCU_INIT_POINTER(xfrm_translator, NULL);
2578 }
2579 spin_unlock_bh(&xfrm_translator_lock);
2580 synchronize_rcu();
2581
2582 return err;
2583}
2584EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2585#endif
2586
c6d1b26a 2587int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
1da177e4
LT		 2588{
2589 int err;
2590 u8 *data;
2591 struct xfrm_mgr *km;
2592 struct xfrm_policy *pol = NULL;
2593
c6d1b26a 2594 if (sockptr_is_null(optval) && !optlen) {
be8f8284
LC		 2595 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2596 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2597 __sk_dst_reset(sk);
2598 return 0;
2599 }
2600
1da177e4
LT		 2601 if (optlen <= 0 || optlen > PAGE_SIZE)
2602 return -EMSGSIZE;
2603
c6d1b26a 2604 data = memdup_sockptr(optval, optlen);
a133d930
GT		 2605 if (IS_ERR(data))
2606 return PTR_ERR(data);
1da177e4 2607
96392ee5
DS		 2608 if (in_compat_syscall()) {
2609 struct xfrm_translator *xtr = xfrm_get_translator();
2610
48f486e1
YK		 2611 if (!xtr) {
2612 kfree(data);
96392ee5 2613 return -EOPNOTSUPP;
48f486e1 2614 }
96392ee5
DS		 2615
2616 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2617 xfrm_put_translator(xtr);
2618 if (err) {
2619 kfree(data);
2620 return err;
2621 }
2622 }
2623
1da177e4 2624 err = -EINVAL;
85168c00
CW		 2625 rcu_read_lock();
2626 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
cb969f07 2627 pol = km->compile_policy(sk, optname, data,
1da177e4
LT		 2628 optlen, &err);
2629 if (err >= 0)
2630 break;
2631 }
85168c00 2632 rcu_read_unlock();
1da177e4
LT		 2633
2634 if (err >= 0) {
2635 xfrm_sk_policy_insert(sk, err, pol);
2636 xfrm_pol_put(pol);
2b06cdf3 2637 __sk_dst_reset(sk);
1da177e4
LT		 2638 err = 0;
2639 }
2640
1da177e4
LT		 2641 kfree(data);
2642 return err;
2643}
2644EXPORT_SYMBOL(xfrm_user_policy);
2645
85168c00
CW		 2646static DEFINE_SPINLOCK(xfrm_km_lock);
2647
f41b284a 2648void xfrm_register_km(struct xfrm_mgr *km)
1da177e4 2649{
85168c00
CW		 2650 spin_lock_bh(&xfrm_km_lock);
2651 list_add_tail_rcu(&km->list, &xfrm_km_list);
2652 spin_unlock_bh(&xfrm_km_lock);
1da177e4
LT		 2653}
2654EXPORT_SYMBOL(xfrm_register_km);
2655
f41b284a 2656void xfrm_unregister_km(struct xfrm_mgr *km)
1da177e4 2657{
85168c00
CW		 2658 spin_lock_bh(&xfrm_km_lock);
2659 list_del_rcu(&km->list);
2660 spin_unlock_bh(&xfrm_km_lock);
2661 synchronize_rcu();
1da177e4
LT		 2662}
2663EXPORT_SYMBOL(xfrm_unregister_km);
2664
2665int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2666{
2667 int err = 0;
423826a7
FW		 2668
2669 if (WARN_ON(afinfo->family >= NPROTO))
1da177e4 2670 return -EAFNOSUPPORT;
423826a7 2671
44abdc30 2672 spin_lock_bh(&xfrm_state_afinfo_lock);
1da177e4 2673 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
f31e8d4f 2674 err = -EEXIST;
edcd5821 2675 else
44abdc30
CW		 2676 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2677 spin_unlock_bh(&xfrm_state_afinfo_lock);
1da177e4
LT		 2678 return err;
2679}
2680EXPORT_SYMBOL(xfrm_state_register_afinfo);
2681
2682int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2683{
423826a7
FW		 2684 int err = 0, family = afinfo->family;
2685
2686 if (WARN_ON(family >= NPROTO))
1da177e4 2687 return -EAFNOSUPPORT;
423826a7 2688
44abdc30 2689 spin_lock_bh(&xfrm_state_afinfo_lock);
1da177e4 2690 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
423826a7 2691 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
1da177e4 2692 err = -EINVAL;
edcd5821 2693 else
44abdc30 2694 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1da177e4 2695 }
44abdc30
CW		 2696 spin_unlock_bh(&xfrm_state_afinfo_lock);
2697 synchronize_rcu();
1da177e4
LT		 2698 return err;
2699}
2700EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2701
711059b9
FW		 2702struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2703{
2704 if (unlikely(family >= NPROTO))
2705 return NULL;
2706
2707 return rcu_dereference(xfrm_state_afinfo[family]);
2708}
733a5fac 2709EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
711059b9 2710
628e341f 2711struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1da177e4
LT		 2712{
2713 struct xfrm_state_afinfo *afinfo;
2714 if (unlikely(family >= NPROTO))
2715 return NULL;
44abdc30
CW		 2716 rcu_read_lock();
2717 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
546be240 2718 if (unlikely(!afinfo))
44abdc30 2719 rcu_read_unlock();
1da177e4
LT		 2720 return afinfo;
2721}
2722
b48c05ab
SK		 2723void xfrm_flush_gc(void)
2724{
2725 flush_work(&xfrm_state_gc_work);
2726}
2727EXPORT_SYMBOL(xfrm_flush_gc);
2728
1da177e4
LT		 2729/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2730void xfrm_state_delete_tunnel(struct xfrm_state *x)
2731{
2732 if (x->tunnel) {
2733 struct xfrm_state *t = x->tunnel;
2734
2735 if (atomic_read(&t->tunnel_users) == 2)
2736 xfrm_state_delete(t);
2737 atomic_dec(&t->tunnel_users);
f75a2804 2738 xfrm_state_put_sync(t);
1da177e4
LT		 2739 x->tunnel = NULL;
2740 }
2741}
2742EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2743
a6d95c5a 2744u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
1da177e4 2745{
b3b73b8e 2746 const struct xfrm_type *type = READ_ONCE(x->type);
c7b37c76
FW		 2747 struct crypto_aead *aead;
2748 u32 blksize, net_adj = 0;
2749
2750 if (x->km.state != XFRM_STATE_VALID ||
2751 !type || type->proto != IPPROTO_ESP)
2752 return mtu - x->props.header_len;
2753
2754 aead = x->data;
2755 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
1da177e4 2756
c7b37c76
FW		 2757 switch (x->props.mode) {
2758 case XFRM_MODE_TRANSPORT:
2759 case XFRM_MODE_BEET:
2760 if (x->props.family == AF_INET)
2761 net_adj = sizeof(struct iphdr);
2762 else if (x->props.family == AF_INET6)
2763 net_adj = sizeof(struct ipv6hdr);
2764 break;
2765 case XFRM_MODE_TUNNEL:
2766 break;
2767 default:
2768 WARN_ON_ONCE(1);
2769 break;
2770 }
b3b73b8e 2771
c7b37c76
FW		 2772 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2773 net_adj) & ~(blksize - 1)) + net_adj - 2;
1da177e4 2774}
a6d95c5a 2775EXPORT_SYMBOL_GPL(xfrm_state_mtu);
1da177e4 2776
741f9a10
SD		 2777int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2778 struct netlink_ext_ack *extack)
72cb6962 2779{
c9500d7b
FW		 2780 const struct xfrm_mode *inner_mode;
2781 const struct xfrm_mode *outer_mode;
d094cd83 2782 int family = x->props.family;
72cb6962
HX		 2783 int err;
2784
e4681747 2785 if (family == AF_INET &&
0968d2a4 2786 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
e4681747 2787 x->props.flags |= XFRM_STATE_NOPMTUDISC;
d094cd83
HX		 2788
2789 err = -EPROTONOSUPPORT;
13996378 2790
df9dcb45
KM		 2791 if (x->sel.family != AF_UNSPEC) {
2792 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
741f9a10
SD		 2793 if (inner_mode == NULL) {
2794 NL_SET_ERR_MSG(extack, "Requested mode not found");
df9dcb45 2795 goto error;
741f9a10 2796 }
df9dcb45
KM		 2797
2798 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
741f9a10
SD		 2799 family != x->sel.family) {
2800 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
df9dcb45 2801 goto error;
741f9a10 2802 }
df9dcb45 2803
c9500d7b 2804 x->inner_mode = *inner_mode;
df9dcb45 2805 } else {
4c145dce 2806 const struct xfrm_mode *inner_mode_iaf;
d81d2285 2807 int iafamily = AF_INET;
df9dcb45 2808
d81d2285 2809 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
741f9a10
SD		 2810 if (inner_mode == NULL) {
2811 NL_SET_ERR_MSG(extack, "Requested mode not found");
df9dcb45 2812 goto error;
741f9a10 2813 }
df9dcb45 2814
c9500d7b 2815 x->inner_mode = *inner_mode;
df9dcb45 2816
d81d2285
MW		 2817 if (x->props.family == AF_INET)
2818 iafamily = AF_INET6;
df9dcb45 2819
d81d2285
MW		 2820 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2821 if (inner_mode_iaf) {
2822 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
c9500d7b 2823 x->inner_mode_iaf = *inner_mode_iaf;
df9dcb45
KM		 2824 }
2825 }
13996378 2826
d094cd83 2827 x->type = xfrm_get_type(x->id.proto, family);
741f9a10
SD		 2828 if (x->type == NULL) {
2829 NL_SET_ERR_MSG(extack, "Requested type not found");
72cb6962 2830 goto error;
741f9a10 2831 }
72cb6962 2832
ffdb5211 2833 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
9d389d7f 2834
e1e10b44 2835 err = x->type->init_state(x, extack);
72cb6962
HX		 2836 if (err)
2837 goto error;
2838
c9500d7b
FW		 2839 outer_mode = xfrm_get_mode(x->props.mode, family);
2840 if (!outer_mode) {
741f9a10 2841 NL_SET_ERR_MSG(extack, "Requested mode not found");
599901c3 2842 err = -EPROTONOSUPPORT;
b59f45d0 2843 goto error;
599901c3 2844 }
b59f45d0 2845
c9500d7b 2846 x->outer_mode = *outer_mode;
a454f0cc 2847 if (init_replay) {
1cf9a3ae 2848 err = xfrm_init_replay(x, extack);
a454f0cc
WY		 2849 if (err)
2850 goto error;
2851 }
2852
72cb6962
HX		 2853error:
2854 return err;
2855}
2856
a454f0cc
WY		 2857EXPORT_SYMBOL(__xfrm_init_state);
2858
2859int xfrm_init_state(struct xfrm_state *x)
2860{
cc01572e
YK		 2861 int err;
2862
741f9a10 2863 err = __xfrm_init_state(x, true, false, NULL);
cc01572e
YK		 2864 if (!err)
2865 x->km.state = XFRM_STATE_VALID;
2866
2867 return err;
a454f0cc
WY		 2868}
2869
72cb6962 2870EXPORT_SYMBOL(xfrm_init_state);
a716c119 2871
d62ddc21 2872int __net_init xfrm_state_init(struct net *net)
1da177e4 2873{
f034b5d4
DM		 2874 unsigned int sz;
2875
565f0fa9
MK		 2876 if (net_eq(net, &init_net))
2877 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2878 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2879
9d4139c7
AD		 2880 INIT_LIST_HEAD(&net->xfrm.state_all);
2881
f034b5d4
DM		 2882 sz = sizeof(struct hlist_head) * 8;
2883
73d189dc
AD		 2884 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2885 if (!net->xfrm.state_bydst)
2886 goto out_bydst;
d320bbb3
AD		 2887 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2888 if (!net->xfrm.state_bysrc)
2889 goto out_bysrc;
b754a4fd
AD		 2890 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2891 if (!net->xfrm.state_byspi)
2892 goto out_byspi;
fe9f1d87
SD		 2893 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2894 if (!net->xfrm.state_byseq)
2895 goto out_byseq;
529983ec 2896 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
1da177e4 2897
0bf7c5b0 2898 net->xfrm.state_num = 0;
63082733 2899 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
283bc9f3 2900 spin_lock_init(&net->xfrm.xfrm_state_lock);
bc8e0adf
AD		 2901 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2902 &net->xfrm.xfrm_state_lock);
d62ddc21 2903 return 0;
73d189dc 2904
fe9f1d87
SD		 2905out_byseq:
2906 xfrm_hash_free(net->xfrm.state_byspi, sz);
b754a4fd
AD		 2907out_byspi:
2908 xfrm_hash_free(net->xfrm.state_bysrc, sz);
d320bbb3
AD		 2909out_bysrc:
2910 xfrm_hash_free(net->xfrm.state_bydst, sz);
73d189dc
AD		 2911out_bydst:
2912 return -ENOMEM;
d62ddc21
AD		 2913}
2914
2915void xfrm_state_fini(struct net *net)
2916{
73d189dc
AD		 2917 unsigned int sz;
2918
7c2776ee 2919 flush_work(&net->xfrm.state_hash_work);
35db57bb 2920 flush_work(&xfrm_state_gc_work);
dbb2483b 2921 xfrm_state_flush(net, 0, false, true);
7c2776ee 2922
9d4139c7 2923 WARN_ON(!list_empty(&net->xfrm.state_all));
73d189dc 2924
529983ec 2925 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
fe9f1d87
SD		 2926 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2927 xfrm_hash_free(net->xfrm.state_byseq, sz);
b754a4fd
AD		 2928 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2929 xfrm_hash_free(net->xfrm.state_byspi, sz);
d320bbb3
AD		 2930 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2931 xfrm_hash_free(net->xfrm.state_bysrc, sz);
73d189dc
AD		 2932 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2933 xfrm_hash_free(net->xfrm.state_bydst, sz);
1da177e4
LT		 2934}
2935
ab5f5e8b 2936#ifdef CONFIG_AUDITSYSCALL
cf35f43e
IJ		 2937static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2938 struct audit_buffer *audit_buf)
ab5f5e8b 2939{
68277acc
PM		 2940 struct xfrm_sec_ctx *ctx = x->security;
2941 u32 spi = ntohl(x->id.spi);
2942
2943 if (ctx)
ab5f5e8b 2944 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
68277acc 2945 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2946
9b7a787d 2947 switch (x->props.family) {
ab5f5e8b 2948 case AF_INET:
21454aaa
HH		 2949 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2950 &x->props.saddr.a4, &x->id.daddr.a4);
ab5f5e8b
JL		 2951 break;
2952 case AF_INET6:
5b095d98 2953 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
fdb46ee7 2954 x->props.saddr.a6, x->id.daddr.a6);
ab5f5e8b
JL		 2955 break;
2956 }
68277acc
PM		 2957
2958 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
ab5f5e8b
JL		 2959}
2960
cf35f43e
IJ		 2961static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2962 struct audit_buffer *audit_buf)
afeb14b4 2963{
b71d1d42
ED		 2964 const struct iphdr *iph4;
2965 const struct ipv6hdr *iph6;
afeb14b4
PM		 2966
2967 switch (family) {
2968 case AF_INET:
2969 iph4 = ip_hdr(skb);
21454aaa
HH		 2970 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2971 &iph4->saddr, &iph4->daddr);
afeb14b4
PM		 2972 break;
2973 case AF_INET6:
2974 iph6 = ipv6_hdr(skb);
2975 audit_log_format(audit_buf,
5b095d98 2976 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
9b7a787d 2977 &iph6->saddr, &iph6->daddr,
afeb14b4
PM		 2978 iph6->flow_lbl[0] & 0x0f,
2979 iph6->flow_lbl[1],
2980 iph6->flow_lbl[2]);
2981 break;
2982 }
2983}
2984
2e71029e 2985void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
ab5f5e8b
JL		 2986{
2987 struct audit_buffer *audit_buf;
ab5f5e8b 2988
afeb14b4 2989 audit_buf = xfrm_audit_start("SAD-add");
ab5f5e8b
JL		 2990 if (audit_buf == NULL)
2991 return;
2e71029e 2992 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4
PM		 2993 xfrm_audit_helper_sainfo(x, audit_buf);
2994 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 2995 audit_log_end(audit_buf);
2996}
2997EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2998
2e71029e 2999void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
ab5f5e8b
JL		 3000{
3001 struct audit_buffer *audit_buf;
ab5f5e8b 3002
afeb14b4 3003 audit_buf = xfrm_audit_start("SAD-delete");
ab5f5e8b
JL		 3004 if (audit_buf == NULL)
3005 return;
2e71029e 3006 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
afeb14b4
PM		 3007 xfrm_audit_helper_sainfo(x, audit_buf);
3008 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3009 audit_log_end(audit_buf);
3010}
3011EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
afeb14b4
PM		 3012
3013void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
3014 struct sk_buff *skb)
3015{
3016 struct audit_buffer *audit_buf;
3017 u32 spi;
3018
3019 audit_buf = xfrm_audit_start("SA-replay-overflow");
3020 if (audit_buf == NULL)
3021 return;
3022 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3023 /* don't record the sequence number because it's inherent in this kind
3024 * of audit message */
3025 spi = ntohl(x->id.spi);
3026 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
3027 audit_log_end(audit_buf);
3028}
3029EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
3030
9fdc4883 3031void xfrm_audit_state_replay(struct xfrm_state *x,
afeb14b4
PM		 3032 struct sk_buff *skb, __be32 net_seq)
3033{
3034 struct audit_buffer *audit_buf;
3035 u32 spi;
3036
3037 audit_buf = xfrm_audit_start("SA-replayed-pkt");
3038 if (audit_buf == NULL)
3039 return;
3040 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3041 spi = ntohl(x->id.spi);
3042 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3043 spi, spi, ntohl(net_seq));
3044 audit_log_end(audit_buf);
3045}
9fdc4883 3046EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
afeb14b4
PM		 3047
3048void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
3049{
3050 struct audit_buffer *audit_buf;
3051
3052 audit_buf = xfrm_audit_start("SA-notfound");
3053 if (audit_buf == NULL)
3054 return;
3055 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3056 audit_log_end(audit_buf);
3057}
3058EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
3059
3060void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
3061 __be32 net_spi, __be32 net_seq)
3062{
3063 struct audit_buffer *audit_buf;
3064 u32 spi;
3065
3066 audit_buf = xfrm_audit_start("SA-notfound");
3067 if (audit_buf == NULL)
3068 return;
3069 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3070 spi = ntohl(net_spi);
3071 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3072 spi, spi, ntohl(net_seq));
3073 audit_log_end(audit_buf);
3074}
3075EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
3076
3077void xfrm_audit_state_icvfail(struct xfrm_state *x,
3078 struct sk_buff *skb, u8 proto)
3079{
3080 struct audit_buffer *audit_buf;
3081 __be32 net_spi;
3082 __be32 net_seq;
3083
3084 audit_buf = xfrm_audit_start("SA-icv-failure");
3085 if (audit_buf == NULL)
3086 return;
3087 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3088 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
3089 u32 spi = ntohl(net_spi);
3090 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3091 spi, spi, ntohl(net_seq));
3092 }
3093 audit_log_end(audit_buf);
3094}
3095EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
ab5f5e8b 3096#endif /* CONFIG_AUDITSYSCALL */
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