1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * xfrm_state.c
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 * YOSHIFUJI Hideaki @USAGI
11 * Split up af-specific functions
12 * Derek Atkins <derek@ihtfp.com>
13 * Add UDP Encapsulation
14 *
15 */
16
17 #include <linux/workqueue.h>
18 #include <net/xfrm.h>
19 #include <linux/pfkeyv2.h>
20 #include <linux/ipsec.h>
21 #include <linux/module.h>
22 #include <linux/cache.h>
23 #include <linux/audit.h>
24 #include <linux/uaccess.h>
25 #include <linux/ktime.h>
26 #include <linux/slab.h>
27 #include <linux/interrupt.h>
28 #include <linux/kernel.h>
29
30 #include <crypto/aead.h>
31
32 #include "xfrm_hash.h"
33
34 #define xfrm_state_deref_prot(table, net) \
35 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
36
37 static void xfrm_state_gc_task(struct work_struct *work);
38
39 /* Each xfrm_state may be linked to two tables:
40
41 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
42 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
43 destination/tunnel endpoint. (output)
44 */
45
46 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
47 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
48 static struct kmem_cache *xfrm_state_cache __ro_after_init;
49
50 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
51 static HLIST_HEAD(xfrm_state_gc_list);
52
xfrm_state_hold_rcu(struct xfrm_state __rcu * x)53 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
54 {
55 return refcount_inc_not_zero(&x->refcnt);
56 }
57
xfrm_dst_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u32 reqid,unsigned short family)58 static inline unsigned int xfrm_dst_hash(struct net *net,
59 const xfrm_address_t *daddr,
60 const xfrm_address_t *saddr,
61 u32 reqid,
62 unsigned short family)
63 {
64 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
65 }
66
xfrm_src_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)67 static inline unsigned int xfrm_src_hash(struct net *net,
68 const xfrm_address_t *daddr,
69 const xfrm_address_t *saddr,
70 unsigned short family)
71 {
72 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
73 }
74
75 static inline unsigned int
xfrm_spi_hash(struct net * net,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)76 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
77 __be32 spi, u8 proto, unsigned short family)
78 {
79 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
80 }
81
xfrm_hash_transfer(struct hlist_head * list,struct hlist_head * ndsttable,struct hlist_head * nsrctable,struct hlist_head * nspitable,unsigned int nhashmask)82 static void xfrm_hash_transfer(struct hlist_head *list,
83 struct hlist_head *ndsttable,
84 struct hlist_head *nsrctable,
85 struct hlist_head *nspitable,
86 unsigned int nhashmask)
87 {
88 struct hlist_node *tmp;
89 struct xfrm_state *x;
90
91 hlist_for_each_entry_safe(x, tmp, list, bydst) {
92 unsigned int h;
93
94 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
95 x->props.reqid, x->props.family,
96 nhashmask);
97 hlist_add_head_rcu(&x->bydst, ndsttable + h);
98
99 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
100 x->props.family,
101 nhashmask);
102 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
103
104 if (x->id.spi) {
105 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
106 x->id.proto, x->props.family,
107 nhashmask);
108 hlist_add_head_rcu(&x->byspi, nspitable + h);
109 }
110 }
111 }
112
xfrm_hash_new_size(unsigned int state_hmask)113 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
114 {
115 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
116 }
117
xfrm_hash_resize(struct work_struct * work)118 static void xfrm_hash_resize(struct work_struct *work)
119 {
120 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
121 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
122 unsigned long nsize, osize;
123 unsigned int nhashmask, ohashmask;
124 int i;
125
126 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
127 ndst = xfrm_hash_alloc(nsize);
128 if (!ndst)
129 return;
130 nsrc = xfrm_hash_alloc(nsize);
131 if (!nsrc) {
132 xfrm_hash_free(ndst, nsize);
133 return;
134 }
135 nspi = xfrm_hash_alloc(nsize);
136 if (!nspi) {
137 xfrm_hash_free(ndst, nsize);
138 xfrm_hash_free(nsrc, nsize);
139 return;
140 }
141
142 spin_lock_bh(&net->xfrm.xfrm_state_lock);
143 write_seqcount_begin(&xfrm_state_hash_generation);
144
145 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
146 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
147 for (i = net->xfrm.state_hmask; i >= 0; i--)
148 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
149
150 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
151 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
152 ohashmask = net->xfrm.state_hmask;
153
154 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
155 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
156 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
157 net->xfrm.state_hmask = nhashmask;
158
159 write_seqcount_end(&xfrm_state_hash_generation);
160 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
161
162 osize = (ohashmask + 1) * sizeof(struct hlist_head);
163
164 synchronize_rcu();
165
166 xfrm_hash_free(odst, osize);
167 xfrm_hash_free(osrc, osize);
168 xfrm_hash_free(ospi, osize);
169 }
170
171 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
172 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
173
174 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
175
176 int __xfrm_state_delete(struct xfrm_state *x);
177
178 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
179 static bool km_is_alive(const struct km_event *c);
180 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
181
xfrm_register_type(const struct xfrm_type * type,unsigned short family)182 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
183 {
184 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
185 int err = 0;
186
187 if (!afinfo)
188 return -EAFNOSUPPORT;
189
190 #define X(afi, T, name) do { \
191 WARN_ON((afi)->type_ ## name); \
192 (afi)->type_ ## name = (T); \
193 } while (0)
194
195 switch (type->proto) {
196 case IPPROTO_COMP:
197 X(afinfo, type, comp);
198 break;
199 case IPPROTO_AH:
200 X(afinfo, type, ah);
201 break;
202 case IPPROTO_ESP:
203 X(afinfo, type, esp);
204 break;
205 case IPPROTO_IPIP:
206 X(afinfo, type, ipip);
207 break;
208 case IPPROTO_DSTOPTS:
209 X(afinfo, type, dstopts);
210 break;
211 case IPPROTO_ROUTING:
212 X(afinfo, type, routing);
213 break;
214 case IPPROTO_IPV6:
215 X(afinfo, type, ipip6);
216 break;
217 default:
218 WARN_ON(1);
219 err = -EPROTONOSUPPORT;
220 break;
221 }
222 #undef X
223 rcu_read_unlock();
224 return err;
225 }
226 EXPORT_SYMBOL(xfrm_register_type);
227
xfrm_unregister_type(const struct xfrm_type * type,unsigned short family)228 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
229 {
230 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
231
232 if (unlikely(afinfo == NULL))
233 return;
234
235 #define X(afi, T, name) do { \
236 WARN_ON((afi)->type_ ## name != (T)); \
237 (afi)->type_ ## name = NULL; \
238 } while (0)
239
240 switch (type->proto) {
241 case IPPROTO_COMP:
242 X(afinfo, type, comp);
243 break;
244 case IPPROTO_AH:
245 X(afinfo, type, ah);
246 break;
247 case IPPROTO_ESP:
248 X(afinfo, type, esp);
249 break;
250 case IPPROTO_IPIP:
251 X(afinfo, type, ipip);
252 break;
253 case IPPROTO_DSTOPTS:
254 X(afinfo, type, dstopts);
255 break;
256 case IPPROTO_ROUTING:
257 X(afinfo, type, routing);
258 break;
259 case IPPROTO_IPV6:
260 X(afinfo, type, ipip6);
261 break;
262 default:
263 WARN_ON(1);
264 break;
265 }
266 #undef X
267 rcu_read_unlock();
268 }
269 EXPORT_SYMBOL(xfrm_unregister_type);
270
xfrm_get_type(u8 proto,unsigned short family)271 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
272 {
273 const struct xfrm_type *type = NULL;
274 struct xfrm_state_afinfo *afinfo;
275 int modload_attempted = 0;
276
277 retry:
278 afinfo = xfrm_state_get_afinfo(family);
279 if (unlikely(afinfo == NULL))
280 return NULL;
281
282 switch (proto) {
283 case IPPROTO_COMP:
284 type = afinfo->type_comp;
285 break;
286 case IPPROTO_AH:
287 type = afinfo->type_ah;
288 break;
289 case IPPROTO_ESP:
290 type = afinfo->type_esp;
291 break;
292 case IPPROTO_IPIP:
293 type = afinfo->type_ipip;
294 break;
295 case IPPROTO_DSTOPTS:
296 type = afinfo->type_dstopts;
297 break;
298 case IPPROTO_ROUTING:
299 type = afinfo->type_routing;
300 break;
301 case IPPROTO_IPV6:
302 type = afinfo->type_ipip6;
303 break;
304 default:
305 break;
306 }
307
308 if (unlikely(type && !try_module_get(type->owner)))
309 type = NULL;
310
311 rcu_read_unlock();
312
313 if (!type && !modload_attempted) {
314 request_module("xfrm-type-%d-%d", family, proto);
315 modload_attempted = 1;
316 goto retry;
317 }
318
319 return type;
320 }
321
xfrm_put_type(const struct xfrm_type * type)322 static void xfrm_put_type(const struct xfrm_type *type)
323 {
324 module_put(type->owner);
325 }
326
xfrm_register_type_offload(const struct xfrm_type_offload * type,unsigned short family)327 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
328 unsigned short family)
329 {
330 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
331 int err = 0;
332
333 if (unlikely(afinfo == NULL))
334 return -EAFNOSUPPORT;
335
336 switch (type->proto) {
337 case IPPROTO_ESP:
338 WARN_ON(afinfo->type_offload_esp);
339 afinfo->type_offload_esp = type;
340 break;
341 default:
342 WARN_ON(1);
343 err = -EPROTONOSUPPORT;
344 break;
345 }
346
347 rcu_read_unlock();
348 return err;
349 }
350 EXPORT_SYMBOL(xfrm_register_type_offload);
351
xfrm_unregister_type_offload(const struct xfrm_type_offload * type,unsigned short family)352 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
353 unsigned short family)
354 {
355 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
356
357 if (unlikely(afinfo == NULL))
358 return;
359
360 switch (type->proto) {
361 case IPPROTO_ESP:
362 WARN_ON(afinfo->type_offload_esp != type);
363 afinfo->type_offload_esp = NULL;
364 break;
365 default:
366 WARN_ON(1);
367 break;
368 }
369 rcu_read_unlock();
370 }
371 EXPORT_SYMBOL(xfrm_unregister_type_offload);
372
373 static const struct xfrm_type_offload *
xfrm_get_type_offload(u8 proto,unsigned short family,bool try_load)374 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
375 {
376 const struct xfrm_type_offload *type = NULL;
377 struct xfrm_state_afinfo *afinfo;
378
379 retry:
380 afinfo = xfrm_state_get_afinfo(family);
381 if (unlikely(afinfo == NULL))
382 return NULL;
383
384 switch (proto) {
385 case IPPROTO_ESP:
386 type = afinfo->type_offload_esp;
387 break;
388 default:
389 break;
390 }
391
392 if ((type && !try_module_get(type->owner)))
393 type = NULL;
394
395 rcu_read_unlock();
396
397 if (!type && try_load) {
398 request_module("xfrm-offload-%d-%d", family, proto);
399 try_load = false;
400 goto retry;
401 }
402
403 return type;
404 }
405
xfrm_put_type_offload(const struct xfrm_type_offload * type)406 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
407 {
408 module_put(type->owner);
409 }
410
411 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
412 [XFRM_MODE_BEET] = {
413 .encap = XFRM_MODE_BEET,
414 .flags = XFRM_MODE_FLAG_TUNNEL,
415 .family = AF_INET,
416 },
417 [XFRM_MODE_TRANSPORT] = {
418 .encap = XFRM_MODE_TRANSPORT,
419 .family = AF_INET,
420 },
421 [XFRM_MODE_TUNNEL] = {
422 .encap = XFRM_MODE_TUNNEL,
423 .flags = XFRM_MODE_FLAG_TUNNEL,
424 .family = AF_INET,
425 },
426 };
427
428 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
429 [XFRM_MODE_BEET] = {
430 .encap = XFRM_MODE_BEET,
431 .flags = XFRM_MODE_FLAG_TUNNEL,
432 .family = AF_INET6,
433 },
434 [XFRM_MODE_ROUTEOPTIMIZATION] = {
435 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
436 .family = AF_INET6,
437 },
438 [XFRM_MODE_TRANSPORT] = {
439 .encap = XFRM_MODE_TRANSPORT,
440 .family = AF_INET6,
441 },
442 [XFRM_MODE_TUNNEL] = {
443 .encap = XFRM_MODE_TUNNEL,
444 .flags = XFRM_MODE_FLAG_TUNNEL,
445 .family = AF_INET6,
446 },
447 };
448
xfrm_get_mode(unsigned int encap,int family)449 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
450 {
451 const struct xfrm_mode *mode;
452
453 if (unlikely(encap >= XFRM_MODE_MAX))
454 return NULL;
455
456 switch (family) {
457 case AF_INET:
458 mode = &xfrm4_mode_map[encap];
459 if (mode->family == family)
460 return mode;
461 break;
462 case AF_INET6:
463 mode = &xfrm6_mode_map[encap];
464 if (mode->family == family)
465 return mode;
466 break;
467 default:
468 break;
469 }
470
471 return NULL;
472 }
473
xfrm_state_free(struct xfrm_state * x)474 void xfrm_state_free(struct xfrm_state *x)
475 {
476 kmem_cache_free(xfrm_state_cache, x);
477 }
478 EXPORT_SYMBOL(xfrm_state_free);
479
___xfrm_state_destroy(struct xfrm_state * x)480 static void ___xfrm_state_destroy(struct xfrm_state *x)
481 {
482 hrtimer_cancel(&x->mtimer);
483 del_timer_sync(&x->rtimer);
484 kfree(x->aead);
485 kfree(x->aalg);
486 kfree(x->ealg);
487 kfree(x->calg);
488 kfree(x->encap);
489 kfree(x->coaddr);
490 kfree(x->replay_esn);
491 kfree(x->preplay_esn);
492 if (x->type_offload)
493 xfrm_put_type_offload(x->type_offload);
494 if (x->type) {
495 x->type->destructor(x);
496 xfrm_put_type(x->type);
497 }
498 if (x->xfrag.page)
499 put_page(x->xfrag.page);
500 xfrm_dev_state_free(x);
501 security_xfrm_state_free(x);
502 xfrm_state_free(x);
503 }
504
xfrm_state_gc_task(struct work_struct * work)505 static void xfrm_state_gc_task(struct work_struct *work)
506 {
507 struct xfrm_state *x;
508 struct hlist_node *tmp;
509 struct hlist_head gc_list;
510
511 spin_lock_bh(&xfrm_state_gc_lock);
512 hlist_move_list(&xfrm_state_gc_list, &gc_list);
513 spin_unlock_bh(&xfrm_state_gc_lock);
514
515 synchronize_rcu();
516
517 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
518 ___xfrm_state_destroy(x);
519 }
520
xfrm_timer_handler(struct hrtimer * me)521 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
522 {
523 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
524 enum hrtimer_restart ret = HRTIMER_NORESTART;
525 time64_t now = ktime_get_real_seconds();
526 time64_t next = TIME64_MAX;
527 int warn = 0;
528 int err = 0;
529
530 spin_lock(&x->lock);
531 if (x->km.state == XFRM_STATE_DEAD)
532 goto out;
533 if (x->km.state == XFRM_STATE_EXPIRED)
534 goto expired;
535 if (x->lft.hard_add_expires_seconds) {
536 long tmo = x->lft.hard_add_expires_seconds +
537 x->curlft.add_time - now;
538 if (tmo <= 0) {
539 if (x->xflags & XFRM_SOFT_EXPIRE) {
540 /* enter hard expire without soft expire first?!
541 * setting a new date could trigger this.
542 * workaround: fix x->curflt.add_time by below:
543 */
544 x->curlft.add_time = now - x->saved_tmo - 1;
545 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
546 } else
547 goto expired;
548 }
549 if (tmo < next)
550 next = tmo;
551 }
552 if (x->lft.hard_use_expires_seconds) {
553 long tmo = x->lft.hard_use_expires_seconds +
554 (x->curlft.use_time ? : now) - now;
555 if (tmo <= 0)
556 goto expired;
557 if (tmo < next)
558 next = tmo;
559 }
560 if (x->km.dying)
561 goto resched;
562 if (x->lft.soft_add_expires_seconds) {
563 long tmo = x->lft.soft_add_expires_seconds +
564 x->curlft.add_time - now;
565 if (tmo <= 0) {
566 warn = 1;
567 x->xflags &= ~XFRM_SOFT_EXPIRE;
568 } else if (tmo < next) {
569 next = tmo;
570 x->xflags |= XFRM_SOFT_EXPIRE;
571 x->saved_tmo = tmo;
572 }
573 }
574 if (x->lft.soft_use_expires_seconds) {
575 long tmo = x->lft.soft_use_expires_seconds +
576 (x->curlft.use_time ? : now) - now;
577 if (tmo <= 0)
578 warn = 1;
579 else if (tmo < next)
580 next = tmo;
581 }
582
583 x->km.dying = warn;
584 if (warn)
585 km_state_expired(x, 0, 0);
586 resched:
587 if (next != TIME64_MAX) {
588 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
589 ret = HRTIMER_RESTART;
590 }
591
592 goto out;
593
594 expired:
595 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
596 x->km.state = XFRM_STATE_EXPIRED;
597
598 err = __xfrm_state_delete(x);
599 if (!err)
600 km_state_expired(x, 1, 0);
601
602 xfrm_audit_state_delete(x, err ? 0 : 1, true);
603
604 out:
605 spin_unlock(&x->lock);
606 return ret;
607 }
608
609 static void xfrm_replay_timer_handler(struct timer_list *t);
610
xfrm_state_alloc(struct net * net)611 struct xfrm_state *xfrm_state_alloc(struct net *net)
612 {
613 struct xfrm_state *x;
614
615 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
616
617 if (x) {
618 write_pnet(&x->xs_net, net);
619 refcount_set(&x->refcnt, 1);
620 atomic_set(&x->tunnel_users, 0);
621 INIT_LIST_HEAD(&x->km.all);
622 INIT_HLIST_NODE(&x->bydst);
623 INIT_HLIST_NODE(&x->bysrc);
624 INIT_HLIST_NODE(&x->byspi);
625 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
626 x->mtimer.function = xfrm_timer_handler;
627 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
628 x->curlft.add_time = ktime_get_real_seconds();
629 x->lft.soft_byte_limit = XFRM_INF;
630 x->lft.soft_packet_limit = XFRM_INF;
631 x->lft.hard_byte_limit = XFRM_INF;
632 x->lft.hard_packet_limit = XFRM_INF;
633 x->replay_maxage = 0;
634 x->replay_maxdiff = 0;
635 spin_lock_init(&x->lock);
636 }
637 return x;
638 }
639 EXPORT_SYMBOL(xfrm_state_alloc);
640
__xfrm_state_destroy(struct xfrm_state * x,bool sync)641 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
642 {
643 WARN_ON(x->km.state != XFRM_STATE_DEAD);
644
645 if (sync) {
646 synchronize_rcu();
647 ___xfrm_state_destroy(x);
648 } else {
649 spin_lock_bh(&xfrm_state_gc_lock);
650 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
651 spin_unlock_bh(&xfrm_state_gc_lock);
652 schedule_work(&xfrm_state_gc_work);
653 }
654 }
655 EXPORT_SYMBOL(__xfrm_state_destroy);
656
__xfrm_state_delete(struct xfrm_state * x)657 int __xfrm_state_delete(struct xfrm_state *x)
658 {
659 struct net *net = xs_net(x);
660 int err = -ESRCH;
661
662 if (x->km.state != XFRM_STATE_DEAD) {
663 x->km.state = XFRM_STATE_DEAD;
664 spin_lock(&net->xfrm.xfrm_state_lock);
665 list_del(&x->km.all);
666 hlist_del_rcu(&x->bydst);
667 hlist_del_rcu(&x->bysrc);
668 if (x->id.spi)
669 hlist_del_rcu(&x->byspi);
670 net->xfrm.state_num--;
671 spin_unlock(&net->xfrm.xfrm_state_lock);
672
673 if (x->encap_sk)
674 sock_put(rcu_dereference_raw(x->encap_sk));
675
676 xfrm_dev_state_delete(x);
677
678 /* All xfrm_state objects are created by xfrm_state_alloc.
679 * The xfrm_state_alloc call gives a reference, and that
680 * is what we are dropping here.
681 */
682 xfrm_state_put(x);
683 err = 0;
684 }
685
686 return err;
687 }
688 EXPORT_SYMBOL(__xfrm_state_delete);
689
xfrm_state_delete(struct xfrm_state * x)690 int xfrm_state_delete(struct xfrm_state *x)
691 {
692 int err;
693
694 spin_lock_bh(&x->lock);
695 err = __xfrm_state_delete(x);
696 spin_unlock_bh(&x->lock);
697
698 return err;
699 }
700 EXPORT_SYMBOL(xfrm_state_delete);
701
702 #ifdef CONFIG_SECURITY_NETWORK_XFRM
703 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)704 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
705 {
706 int i, err = 0;
707
708 for (i = 0; i <= net->xfrm.state_hmask; i++) {
709 struct xfrm_state *x;
710
711 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
712 if (xfrm_id_proto_match(x->id.proto, proto) &&
713 (err = security_xfrm_state_delete(x)) != 0) {
714 xfrm_audit_state_delete(x, 0, task_valid);
715 return err;
716 }
717 }
718 }
719
720 return err;
721 }
722
723 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)724 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
725 {
726 int i, err = 0;
727
728 for (i = 0; i <= net->xfrm.state_hmask; i++) {
729 struct xfrm_state *x;
730 struct xfrm_state_offload *xso;
731
732 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
733 xso = &x->xso;
734
735 if (xso->dev == dev &&
736 (err = security_xfrm_state_delete(x)) != 0) {
737 xfrm_audit_state_delete(x, 0, task_valid);
738 return err;
739 }
740 }
741 }
742
743 return err;
744 }
745 #else
746 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)747 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
748 {
749 return 0;
750 }
751
752 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)753 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
754 {
755 return 0;
756 }
757 #endif
758
xfrm_state_flush(struct net * net,u8 proto,bool task_valid,bool sync)759 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
760 {
761 int i, err = 0, cnt = 0;
762
763 spin_lock_bh(&net->xfrm.xfrm_state_lock);
764 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
765 if (err)
766 goto out;
767
768 err = -ESRCH;
769 for (i = 0; i <= net->xfrm.state_hmask; i++) {
770 struct xfrm_state *x;
771 restart:
772 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
773 if (!xfrm_state_kern(x) &&
774 xfrm_id_proto_match(x->id.proto, proto)) {
775 xfrm_state_hold(x);
776 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
777
778 err = xfrm_state_delete(x);
779 xfrm_audit_state_delete(x, err ? 0 : 1,
780 task_valid);
781 if (sync)
782 xfrm_state_put_sync(x);
783 else
784 xfrm_state_put(x);
785 if (!err)
786 cnt++;
787
788 spin_lock_bh(&net->xfrm.xfrm_state_lock);
789 goto restart;
790 }
791 }
792 }
793 out:
794 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
795 if (cnt)
796 err = 0;
797
798 return err;
799 }
800 EXPORT_SYMBOL(xfrm_state_flush);
801
xfrm_dev_state_flush(struct net * net,struct net_device * dev,bool task_valid)802 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
803 {
804 int i, err = 0, cnt = 0;
805
806 spin_lock_bh(&net->xfrm.xfrm_state_lock);
807 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
808 if (err)
809 goto out;
810
811 err = -ESRCH;
812 for (i = 0; i <= net->xfrm.state_hmask; i++) {
813 struct xfrm_state *x;
814 struct xfrm_state_offload *xso;
815 restart:
816 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
817 xso = &x->xso;
818
819 if (!xfrm_state_kern(x) && xso->dev == dev) {
820 xfrm_state_hold(x);
821 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
822
823 err = xfrm_state_delete(x);
824 xfrm_audit_state_delete(x, err ? 0 : 1,
825 task_valid);
826 xfrm_state_put(x);
827 if (!err)
828 cnt++;
829
830 spin_lock_bh(&net->xfrm.xfrm_state_lock);
831 goto restart;
832 }
833 }
834 }
835 if (cnt)
836 err = 0;
837
838 out:
839 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
840 return err;
841 }
842 EXPORT_SYMBOL(xfrm_dev_state_flush);
843
xfrm_sad_getinfo(struct net * net,struct xfrmk_sadinfo * si)844 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
845 {
846 spin_lock_bh(&net->xfrm.xfrm_state_lock);
847 si->sadcnt = net->xfrm.state_num;
848 si->sadhcnt = net->xfrm.state_hmask + 1;
849 si->sadhmcnt = xfrm_state_hashmax;
850 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
851 }
852 EXPORT_SYMBOL(xfrm_sad_getinfo);
853
854 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)855 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
856 {
857 const struct flowi4 *fl4 = &fl->u.ip4;
858
859 sel->daddr.a4 = fl4->daddr;
860 sel->saddr.a4 = fl4->saddr;
861 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
862 sel->dport_mask = htons(0xffff);
863 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
864 sel->sport_mask = htons(0xffff);
865 sel->family = AF_INET;
866 sel->prefixlen_d = 32;
867 sel->prefixlen_s = 32;
868 sel->proto = fl4->flowi4_proto;
869 sel->ifindex = fl4->flowi4_oif;
870 }
871
872 static void
__xfrm6_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)873 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
874 {
875 const struct flowi6 *fl6 = &fl->u.ip6;
876
877 /* Initialize temporary selector matching only to current session. */
878 *(struct in6_addr *)&sel->daddr = fl6->daddr;
879 *(struct in6_addr *)&sel->saddr = fl6->saddr;
880 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
881 sel->dport_mask = htons(0xffff);
882 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
883 sel->sport_mask = htons(0xffff);
884 sel->family = AF_INET6;
885 sel->prefixlen_d = 128;
886 sel->prefixlen_s = 128;
887 sel->proto = fl6->flowi6_proto;
888 sel->ifindex = fl6->flowi6_oif;
889 }
890
891 static void
xfrm_init_tempstate(struct xfrm_state * x,const struct flowi * fl,const struct xfrm_tmpl * tmpl,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)892 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
893 const struct xfrm_tmpl *tmpl,
894 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
895 unsigned short family)
896 {
897 switch (family) {
898 case AF_INET:
899 __xfrm4_init_tempsel(&x->sel, fl);
900 break;
901 case AF_INET6:
902 __xfrm6_init_tempsel(&x->sel, fl);
903 break;
904 }
905
906 x->id = tmpl->id;
907
908 switch (tmpl->encap_family) {
909 case AF_INET:
910 if (x->id.daddr.a4 == 0)
911 x->id.daddr.a4 = daddr->a4;
912 x->props.saddr = tmpl->saddr;
913 if (x->props.saddr.a4 == 0)
914 x->props.saddr.a4 = saddr->a4;
915 break;
916 case AF_INET6:
917 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
918 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
919 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
920 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
921 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
922 break;
923 }
924
925 x->props.mode = tmpl->mode;
926 x->props.reqid = tmpl->reqid;
927 x->props.family = tmpl->encap_family;
928 }
929
__xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)930 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
931 const xfrm_address_t *daddr,
932 __be32 spi, u8 proto,
933 unsigned short family)
934 {
935 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
936 struct xfrm_state *x;
937
938 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
939 if (x->props.family != family ||
940 x->id.spi != spi ||
941 x->id.proto != proto ||
942 !xfrm_addr_equal(&x->id.daddr, daddr, family))
943 continue;
944
945 if ((mark & x->mark.m) != x->mark.v)
946 continue;
947 if (!xfrm_state_hold_rcu(x))
948 continue;
949 return x;
950 }
951
952 return NULL;
953 }
954
__xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)955 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
956 const xfrm_address_t *daddr,
957 const xfrm_address_t *saddr,
958 u8 proto, unsigned short family)
959 {
960 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
961 struct xfrm_state *x;
962
963 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
964 if (x->props.family != family ||
965 x->id.proto != proto ||
966 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
967 !xfrm_addr_equal(&x->props.saddr, saddr, family))
968 continue;
969
970 if ((mark & x->mark.m) != x->mark.v)
971 continue;
972 if (!xfrm_state_hold_rcu(x))
973 continue;
974 return x;
975 }
976
977 return NULL;
978 }
979
980 static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state * x,int use_spi,int family)981 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
982 {
983 struct net *net = xs_net(x);
984 u32 mark = x->mark.v & x->mark.m;
985
986 if (use_spi)
987 return __xfrm_state_lookup(net, mark, &x->id.daddr,
988 x->id.spi, x->id.proto, family);
989 else
990 return __xfrm_state_lookup_byaddr(net, mark,
991 &x->id.daddr,
992 &x->props.saddr,
993 x->id.proto, family);
994 }
995
xfrm_hash_grow_check(struct net * net,int have_hash_collision)996 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
997 {
998 if (have_hash_collision &&
999 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1000 net->xfrm.state_num > net->xfrm.state_hmask)
1001 schedule_work(&net->xfrm.state_hash_work);
1002 }
1003
xfrm_state_look_at(struct xfrm_policy * pol,struct xfrm_state * x,const struct flowi * fl,unsigned short family,struct xfrm_state ** best,int * acq_in_progress,int * error)1004 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1005 const struct flowi *fl, unsigned short family,
1006 struct xfrm_state **best, int *acq_in_progress,
1007 int *error)
1008 {
1009 /* Resolution logic:
1010 * 1. There is a valid state with matching selector. Done.
1011 * 2. Valid state with inappropriate selector. Skip.
1012 *
1013 * Entering area of "sysdeps".
1014 *
1015 * 3. If state is not valid, selector is temporary, it selects
1016 * only session which triggered previous resolution. Key
1017 * manager will do something to install a state with proper
1018 * selector.
1019 */
1020 if (x->km.state == XFRM_STATE_VALID) {
1021 if ((x->sel.family &&
1022 (x->sel.family != family ||
1023 !xfrm_selector_match(&x->sel, fl, family))) ||
1024 !security_xfrm_state_pol_flow_match(x, pol, fl))
1025 return;
1026
1027 if (!*best ||
1028 (*best)->km.dying > x->km.dying ||
1029 ((*best)->km.dying == x->km.dying &&
1030 (*best)->curlft.add_time < x->curlft.add_time))
1031 *best = x;
1032 } else if (x->km.state == XFRM_STATE_ACQ) {
1033 *acq_in_progress = 1;
1034 } else if (x->km.state == XFRM_STATE_ERROR ||
1035 x->km.state == XFRM_STATE_EXPIRED) {
1036 if ((!x->sel.family ||
1037 (x->sel.family == family &&
1038 xfrm_selector_match(&x->sel, fl, family))) &&
1039 security_xfrm_state_pol_flow_match(x, pol, fl))
1040 *error = -ESRCH;
1041 }
1042 }
1043
1044 struct xfrm_state *
xfrm_state_find(const xfrm_address_t * daddr,const xfrm_address_t * saddr,const struct flowi * fl,struct xfrm_tmpl * tmpl,struct xfrm_policy * pol,int * err,unsigned short family,u32 if_id)1045 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1046 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1047 struct xfrm_policy *pol, int *err,
1048 unsigned short family, u32 if_id)
1049 {
1050 static xfrm_address_t saddr_wildcard = { };
1051 struct net *net = xp_net(pol);
1052 unsigned int h, h_wildcard;
1053 struct xfrm_state *x, *x0, *to_put;
1054 int acquire_in_progress = 0;
1055 int error = 0;
1056 struct xfrm_state *best = NULL;
1057 u32 mark = pol->mark.v & pol->mark.m;
1058 unsigned short encap_family = tmpl->encap_family;
1059 unsigned int sequence;
1060 struct km_event c;
1061
1062 to_put = NULL;
1063
1064 sequence = read_seqcount_begin(&xfrm_state_hash_generation);
1065
1066 rcu_read_lock();
1067 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1068 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1069 if (x->props.family == encap_family &&
1070 x->props.reqid == tmpl->reqid &&
1071 (mark & x->mark.m) == x->mark.v &&
1072 x->if_id == if_id &&
1073 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1074 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1075 tmpl->mode == x->props.mode &&
1076 tmpl->id.proto == x->id.proto &&
1077 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1078 xfrm_state_look_at(pol, x, fl, family,
1079 &best, &acquire_in_progress, &error);
1080 }
1081 if (best || acquire_in_progress)
1082 goto found;
1083
1084 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1085 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1086 if (x->props.family == encap_family &&
1087 x->props.reqid == tmpl->reqid &&
1088 (mark & x->mark.m) == x->mark.v &&
1089 x->if_id == if_id &&
1090 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1091 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1092 tmpl->mode == x->props.mode &&
1093 tmpl->id.proto == x->id.proto &&
1094 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1095 xfrm_state_look_at(pol, x, fl, family,
1096 &best, &acquire_in_progress, &error);
1097 }
1098
1099 found:
1100 x = best;
1101 if (!x && !error && !acquire_in_progress) {
1102 if (tmpl->id.spi &&
1103 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1104 tmpl->id.proto, encap_family)) != NULL) {
1105 to_put = x0;
1106 error = -EEXIST;
1107 goto out;
1108 }
1109
1110 c.net = net;
1111 /* If the KMs have no listeners (yet...), avoid allocating an SA
1112 * for each and every packet - garbage collection might not
1113 * handle the flood.
1114 */
1115 if (!km_is_alive(&c)) {
1116 error = -ESRCH;
1117 goto out;
1118 }
1119
1120 x = xfrm_state_alloc(net);
1121 if (x == NULL) {
1122 error = -ENOMEM;
1123 goto out;
1124 }
1125 /* Initialize temporary state matching only
1126 * to current session. */
1127 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1128 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1129 x->if_id = if_id;
1130
1131 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1132 if (error) {
1133 x->km.state = XFRM_STATE_DEAD;
1134 to_put = x;
1135 x = NULL;
1136 goto out;
1137 }
1138
1139 if (km_query(x, tmpl, pol) == 0) {
1140 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1141 x->km.state = XFRM_STATE_ACQ;
1142 list_add(&x->km.all, &net->xfrm.state_all);
1143 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1144 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1145 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1146 if (x->id.spi) {
1147 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1148 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1149 }
1150 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1151 hrtimer_start(&x->mtimer,
1152 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1153 HRTIMER_MODE_REL_SOFT);
1154 net->xfrm.state_num++;
1155 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1156 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1157 } else {
1158 x->km.state = XFRM_STATE_DEAD;
1159 to_put = x;
1160 x = NULL;
1161 error = -ESRCH;
1162 }
1163 }
1164 out:
1165 if (x) {
1166 if (!xfrm_state_hold_rcu(x)) {
1167 *err = -EAGAIN;
1168 x = NULL;
1169 }
1170 } else {
1171 *err = acquire_in_progress ? -EAGAIN : error;
1172 }
1173 rcu_read_unlock();
1174 if (to_put)
1175 xfrm_state_put(to_put);
1176
1177 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1178 *err = -EAGAIN;
1179 if (x) {
1180 xfrm_state_put(x);
1181 x = NULL;
1182 }
1183 }
1184
1185 return x;
1186 }
1187
1188 struct xfrm_state *
xfrm_stateonly_find(struct net * net,u32 mark,u32 if_id,xfrm_address_t * daddr,xfrm_address_t * saddr,unsigned short family,u8 mode,u8 proto,u32 reqid)1189 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1190 xfrm_address_t *daddr, xfrm_address_t *saddr,
1191 unsigned short family, u8 mode, u8 proto, u32 reqid)
1192 {
1193 unsigned int h;
1194 struct xfrm_state *rx = NULL, *x = NULL;
1195
1196 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1197 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1198 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1199 if (x->props.family == family &&
1200 x->props.reqid == reqid &&
1201 (mark & x->mark.m) == x->mark.v &&
1202 x->if_id == if_id &&
1203 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1204 xfrm_state_addr_check(x, daddr, saddr, family) &&
1205 mode == x->props.mode &&
1206 proto == x->id.proto &&
1207 x->km.state == XFRM_STATE_VALID) {
1208 rx = x;
1209 break;
1210 }
1211 }
1212
1213 if (rx)
1214 xfrm_state_hold(rx);
1215 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1216
1217
1218 return rx;
1219 }
1220 EXPORT_SYMBOL(xfrm_stateonly_find);
1221
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1222 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1223 unsigned short family)
1224 {
1225 struct xfrm_state *x;
1226 struct xfrm_state_walk *w;
1227
1228 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1229 list_for_each_entry(w, &net->xfrm.state_all, all) {
1230 x = container_of(w, struct xfrm_state, km);
1231 if (x->props.family != family ||
1232 x->id.spi != spi)
1233 continue;
1234
1235 xfrm_state_hold(x);
1236 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1237 return x;
1238 }
1239 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1240 return NULL;
1241 }
1242 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1243
__xfrm_state_insert(struct xfrm_state * x)1244 static void __xfrm_state_insert(struct xfrm_state *x)
1245 {
1246 struct net *net = xs_net(x);
1247 unsigned int h;
1248
1249 list_add(&x->km.all, &net->xfrm.state_all);
1250
1251 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1252 x->props.reqid, x->props.family);
1253 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1254
1255 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1256 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1257
1258 if (x->id.spi) {
1259 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1260 x->props.family);
1261
1262 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1263 }
1264
1265 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1266 if (x->replay_maxage)
1267 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1268
1269 net->xfrm.state_num++;
1270
1271 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1272 }
1273
1274 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1275 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1276 {
1277 struct net *net = xs_net(xnew);
1278 unsigned short family = xnew->props.family;
1279 u32 reqid = xnew->props.reqid;
1280 struct xfrm_state *x;
1281 unsigned int h;
1282 u32 mark = xnew->mark.v & xnew->mark.m;
1283 u32 if_id = xnew->if_id;
1284
1285 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1286 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1287 if (x->props.family == family &&
1288 x->props.reqid == reqid &&
1289 x->if_id == if_id &&
1290 (mark & x->mark.m) == x->mark.v &&
1291 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1292 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1293 x->genid++;
1294 }
1295 }
1296
xfrm_state_insert(struct xfrm_state * x)1297 void xfrm_state_insert(struct xfrm_state *x)
1298 {
1299 struct net *net = xs_net(x);
1300
1301 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1302 __xfrm_state_bump_genids(x);
1303 __xfrm_state_insert(x);
1304 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1305 }
1306 EXPORT_SYMBOL(xfrm_state_insert);
1307
1308 /* net->xfrm.xfrm_state_lock is held */
__find_acq_core(struct net * net,const struct xfrm_mark * m,unsigned short family,u8 mode,u32 reqid,u32 if_id,u8 proto,const xfrm_address_t * daddr,const xfrm_address_t * saddr,int create)1309 static struct xfrm_state *__find_acq_core(struct net *net,
1310 const struct xfrm_mark *m,
1311 unsigned short family, u8 mode,
1312 u32 reqid, u32 if_id, u8 proto,
1313 const xfrm_address_t *daddr,
1314 const xfrm_address_t *saddr,
1315 int create)
1316 {
1317 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1318 struct xfrm_state *x;
1319 u32 mark = m->v & m->m;
1320
1321 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1322 if (x->props.reqid != reqid ||
1323 x->props.mode != mode ||
1324 x->props.family != family ||
1325 x->km.state != XFRM_STATE_ACQ ||
1326 x->id.spi != 0 ||
1327 x->id.proto != proto ||
1328 (mark & x->mark.m) != x->mark.v ||
1329 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1330 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1331 continue;
1332
1333 xfrm_state_hold(x);
1334 return x;
1335 }
1336
1337 if (!create)
1338 return NULL;
1339
1340 x = xfrm_state_alloc(net);
1341 if (likely(x)) {
1342 switch (family) {
1343 case AF_INET:
1344 x->sel.daddr.a4 = daddr->a4;
1345 x->sel.saddr.a4 = saddr->a4;
1346 x->sel.prefixlen_d = 32;
1347 x->sel.prefixlen_s = 32;
1348 x->props.saddr.a4 = saddr->a4;
1349 x->id.daddr.a4 = daddr->a4;
1350 break;
1351
1352 case AF_INET6:
1353 x->sel.daddr.in6 = daddr->in6;
1354 x->sel.saddr.in6 = saddr->in6;
1355 x->sel.prefixlen_d = 128;
1356 x->sel.prefixlen_s = 128;
1357 x->props.saddr.in6 = saddr->in6;
1358 x->id.daddr.in6 = daddr->in6;
1359 break;
1360 }
1361
1362 x->km.state = XFRM_STATE_ACQ;
1363 x->id.proto = proto;
1364 x->props.family = family;
1365 x->props.mode = mode;
1366 x->props.reqid = reqid;
1367 x->if_id = if_id;
1368 x->mark.v = m->v;
1369 x->mark.m = m->m;
1370 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1371 xfrm_state_hold(x);
1372 hrtimer_start(&x->mtimer,
1373 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1374 HRTIMER_MODE_REL_SOFT);
1375 list_add(&x->km.all, &net->xfrm.state_all);
1376 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1377 h = xfrm_src_hash(net, daddr, saddr, family);
1378 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1379
1380 net->xfrm.state_num++;
1381
1382 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1383 }
1384
1385 return x;
1386 }
1387
1388 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1389
xfrm_state_add(struct xfrm_state * x)1390 int xfrm_state_add(struct xfrm_state *x)
1391 {
1392 struct net *net = xs_net(x);
1393 struct xfrm_state *x1, *to_put;
1394 int family;
1395 int err;
1396 u32 mark = x->mark.v & x->mark.m;
1397 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1398
1399 family = x->props.family;
1400
1401 to_put = NULL;
1402
1403 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1404
1405 x1 = __xfrm_state_locate(x, use_spi, family);
1406 if (x1) {
1407 to_put = x1;
1408 x1 = NULL;
1409 err = -EEXIST;
1410 goto out;
1411 }
1412
1413 if (use_spi && x->km.seq) {
1414 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1415 if (x1 && ((x1->id.proto != x->id.proto) ||
1416 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1417 to_put = x1;
1418 x1 = NULL;
1419 }
1420 }
1421
1422 if (use_spi && !x1)
1423 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1424 x->props.reqid, x->if_id, x->id.proto,
1425 &x->id.daddr, &x->props.saddr, 0);
1426
1427 __xfrm_state_bump_genids(x);
1428 __xfrm_state_insert(x);
1429 err = 0;
1430
1431 out:
1432 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1433
1434 if (x1) {
1435 xfrm_state_delete(x1);
1436 xfrm_state_put(x1);
1437 }
1438
1439 if (to_put)
1440 xfrm_state_put(to_put);
1441
1442 return err;
1443 }
1444 EXPORT_SYMBOL(xfrm_state_add);
1445
1446 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1447 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1448 {
1449 struct xfrm_user_sec_ctx *uctx;
1450 int size = sizeof(*uctx) + security->ctx_len;
1451 int err;
1452
1453 uctx = kmalloc(size, GFP_KERNEL);
1454 if (!uctx)
1455 return -ENOMEM;
1456
1457 uctx->exttype = XFRMA_SEC_CTX;
1458 uctx->len = size;
1459 uctx->ctx_doi = security->ctx_doi;
1460 uctx->ctx_alg = security->ctx_alg;
1461 uctx->ctx_len = security->ctx_len;
1462 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1463 err = security_xfrm_state_alloc(x, uctx);
1464 kfree(uctx);
1465 if (err)
1466 return err;
1467
1468 return 0;
1469 }
1470
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1471 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1472 struct xfrm_encap_tmpl *encap)
1473 {
1474 struct net *net = xs_net(orig);
1475 struct xfrm_state *x = xfrm_state_alloc(net);
1476 if (!x)
1477 goto out;
1478
1479 memcpy(&x->id, &orig->id, sizeof(x->id));
1480 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1481 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1482 x->props.mode = orig->props.mode;
1483 x->props.replay_window = orig->props.replay_window;
1484 x->props.reqid = orig->props.reqid;
1485 x->props.family = orig->props.family;
1486 x->props.saddr = orig->props.saddr;
1487
1488 if (orig->aalg) {
1489 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1490 if (!x->aalg)
1491 goto error;
1492 }
1493 x->props.aalgo = orig->props.aalgo;
1494
1495 if (orig->aead) {
1496 x->aead = xfrm_algo_aead_clone(orig->aead);
1497 x->geniv = orig->geniv;
1498 if (!x->aead)
1499 goto error;
1500 }
1501 if (orig->ealg) {
1502 x->ealg = xfrm_algo_clone(orig->ealg);
1503 if (!x->ealg)
1504 goto error;
1505 }
1506 x->props.ealgo = orig->props.ealgo;
1507
1508 if (orig->calg) {
1509 x->calg = xfrm_algo_clone(orig->calg);
1510 if (!x->calg)
1511 goto error;
1512 }
1513 x->props.calgo = orig->props.calgo;
1514
1515 if (encap || orig->encap) {
1516 if (encap)
1517 x->encap = kmemdup(encap, sizeof(*x->encap),
1518 GFP_KERNEL);
1519 else
1520 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1521 GFP_KERNEL);
1522
1523 if (!x->encap)
1524 goto error;
1525 }
1526
1527 if (orig->security)
1528 if (clone_security(x, orig->security))
1529 goto error;
1530
1531 if (orig->coaddr) {
1532 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1533 GFP_KERNEL);
1534 if (!x->coaddr)
1535 goto error;
1536 }
1537
1538 if (orig->replay_esn) {
1539 if (xfrm_replay_clone(x, orig))
1540 goto error;
1541 }
1542
1543 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1544 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1545
1546 if (xfrm_init_state(x) < 0)
1547 goto error;
1548
1549 x->props.flags = orig->props.flags;
1550 x->props.extra_flags = orig->props.extra_flags;
1551
1552 x->if_id = orig->if_id;
1553 x->tfcpad = orig->tfcpad;
1554 x->replay_maxdiff = orig->replay_maxdiff;
1555 x->replay_maxage = orig->replay_maxage;
1556 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1557 x->km.state = orig->km.state;
1558 x->km.seq = orig->km.seq;
1559 x->replay = orig->replay;
1560 x->preplay = orig->preplay;
1561
1562 return x;
1563
1564 error:
1565 xfrm_state_put(x);
1566 out:
1567 return NULL;
1568 }
1569
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net)1570 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1571 {
1572 unsigned int h;
1573 struct xfrm_state *x = NULL;
1574
1575 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1576
1577 if (m->reqid) {
1578 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1579 m->reqid, m->old_family);
1580 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1581 if (x->props.mode != m->mode ||
1582 x->id.proto != m->proto)
1583 continue;
1584 if (m->reqid && x->props.reqid != m->reqid)
1585 continue;
1586 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1587 m->old_family) ||
1588 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1589 m->old_family))
1590 continue;
1591 xfrm_state_hold(x);
1592 break;
1593 }
1594 } else {
1595 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1596 m->old_family);
1597 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1598 if (x->props.mode != m->mode ||
1599 x->id.proto != m->proto)
1600 continue;
1601 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1602 m->old_family) ||
1603 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1604 m->old_family))
1605 continue;
1606 xfrm_state_hold(x);
1607 break;
1608 }
1609 }
1610
1611 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1612
1613 return x;
1614 }
1615 EXPORT_SYMBOL(xfrm_migrate_state_find);
1616
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1617 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1618 struct xfrm_migrate *m,
1619 struct xfrm_encap_tmpl *encap)
1620 {
1621 struct xfrm_state *xc;
1622
1623 xc = xfrm_state_clone(x, encap);
1624 if (!xc)
1625 return NULL;
1626
1627 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1628 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1629
1630 /* add state */
1631 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1632 /* a care is needed when the destination address of the
1633 state is to be updated as it is a part of triplet */
1634 xfrm_state_insert(xc);
1635 } else {
1636 if (xfrm_state_add(xc) < 0)
1637 goto error;
1638 }
1639
1640 return xc;
1641 error:
1642 xfrm_state_put(xc);
1643 return NULL;
1644 }
1645 EXPORT_SYMBOL(xfrm_state_migrate);
1646 #endif
1647
xfrm_state_update(struct xfrm_state * x)1648 int xfrm_state_update(struct xfrm_state *x)
1649 {
1650 struct xfrm_state *x1, *to_put;
1651 int err;
1652 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1653 struct net *net = xs_net(x);
1654
1655 to_put = NULL;
1656
1657 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1658 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1659
1660 err = -ESRCH;
1661 if (!x1)
1662 goto out;
1663
1664 if (xfrm_state_kern(x1)) {
1665 to_put = x1;
1666 err = -EEXIST;
1667 goto out;
1668 }
1669
1670 if (x1->km.state == XFRM_STATE_ACQ) {
1671 __xfrm_state_insert(x);
1672 x = NULL;
1673 }
1674 err = 0;
1675
1676 out:
1677 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1678
1679 if (to_put)
1680 xfrm_state_put(to_put);
1681
1682 if (err)
1683 return err;
1684
1685 if (!x) {
1686 xfrm_state_delete(x1);
1687 xfrm_state_put(x1);
1688 return 0;
1689 }
1690
1691 err = -EINVAL;
1692 spin_lock_bh(&x1->lock);
1693 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1694 if (x->encap && x1->encap &&
1695 x->encap->encap_type == x1->encap->encap_type)
1696 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1697 else if (x->encap || x1->encap)
1698 goto fail;
1699
1700 if (x->coaddr && x1->coaddr) {
1701 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1702 }
1703 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1704 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1705 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1706 x1->km.dying = 0;
1707
1708 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1709 HRTIMER_MODE_REL_SOFT);
1710 if (x1->curlft.use_time)
1711 xfrm_state_check_expire(x1);
1712
1713 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1714 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1715
1716 if (x->props.smark.m || x->props.smark.v)
1717 x1->props.smark = x->props.smark;
1718
1719 if (x->if_id)
1720 x1->if_id = x->if_id;
1721
1722 __xfrm_state_bump_genids(x1);
1723 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1724 }
1725
1726 err = 0;
1727 x->km.state = XFRM_STATE_DEAD;
1728 __xfrm_state_put(x);
1729 }
1730
1731 fail:
1732 spin_unlock_bh(&x1->lock);
1733
1734 xfrm_state_put(x1);
1735
1736 return err;
1737 }
1738 EXPORT_SYMBOL(xfrm_state_update);
1739
xfrm_state_check_expire(struct xfrm_state * x)1740 int xfrm_state_check_expire(struct xfrm_state *x)
1741 {
1742 if (!x->curlft.use_time)
1743 x->curlft.use_time = ktime_get_real_seconds();
1744
1745 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1746 x->curlft.packets >= x->lft.hard_packet_limit) {
1747 x->km.state = XFRM_STATE_EXPIRED;
1748 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1749 return -EINVAL;
1750 }
1751
1752 if (!x->km.dying &&
1753 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1754 x->curlft.packets >= x->lft.soft_packet_limit)) {
1755 x->km.dying = 1;
1756 km_state_expired(x, 0, 0);
1757 }
1758 return 0;
1759 }
1760 EXPORT_SYMBOL(xfrm_state_check_expire);
1761
1762 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1763 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1764 u8 proto, unsigned short family)
1765 {
1766 struct xfrm_state *x;
1767
1768 rcu_read_lock();
1769 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1770 rcu_read_unlock();
1771 return x;
1772 }
1773 EXPORT_SYMBOL(xfrm_state_lookup);
1774
1775 struct xfrm_state *
xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)1776 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1777 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1778 u8 proto, unsigned short family)
1779 {
1780 struct xfrm_state *x;
1781
1782 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1783 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1784 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1785 return x;
1786 }
1787 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1788
1789 struct xfrm_state *
xfrm_find_acq(struct net * net,const struct xfrm_mark * mark,u8 mode,u32 reqid,u32 if_id,u8 proto,const xfrm_address_t * daddr,const xfrm_address_t * saddr,int create,unsigned short family)1790 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1791 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1792 const xfrm_address_t *saddr, int create, unsigned short family)
1793 {
1794 struct xfrm_state *x;
1795
1796 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1797 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1798 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1799
1800 return x;
1801 }
1802 EXPORT_SYMBOL(xfrm_find_acq);
1803
1804 #ifdef CONFIG_XFRM_SUB_POLICY
1805 #if IS_ENABLED(CONFIG_IPV6)
1806 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1807 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1808 __xfrm6_sort(void **dst, void **src, int n,
1809 int (*cmp)(const void *p), int maxclass)
1810 {
1811 int count[XFRM_MAX_DEPTH] = { };
1812 int class[XFRM_MAX_DEPTH];
1813 int i;
1814
1815 for (i = 0; i < n; i++) {
1816 int c = cmp(src[i]);
1817
1818 class[i] = c;
1819 count[c]++;
1820 }
1821
1822 for (i = 2; i < maxclass; i++)
1823 count[i] += count[i - 1];
1824
1825 for (i = 0; i < n; i++) {
1826 dst[count[class[i] - 1]++] = src[i];
1827 src[i] = NULL;
1828 }
1829 }
1830
1831 /* Rule for xfrm_state:
1832 *
1833 * rule 1: select IPsec transport except AH
1834 * rule 2: select MIPv6 RO or inbound trigger
1835 * rule 3: select IPsec transport AH
1836 * rule 4: select IPsec tunnel
1837 * rule 5: others
1838 */
__xfrm6_state_sort_cmp(const void * p)1839 static int __xfrm6_state_sort_cmp(const void *p)
1840 {
1841 const struct xfrm_state *v = p;
1842
1843 switch (v->props.mode) {
1844 case XFRM_MODE_TRANSPORT:
1845 if (v->id.proto != IPPROTO_AH)
1846 return 1;
1847 else
1848 return 3;
1849 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1850 case XFRM_MODE_ROUTEOPTIMIZATION:
1851 case XFRM_MODE_IN_TRIGGER:
1852 return 2;
1853 #endif
1854 case XFRM_MODE_TUNNEL:
1855 case XFRM_MODE_BEET:
1856 return 4;
1857 }
1858 return 5;
1859 }
1860
1861 /* Rule for xfrm_tmpl:
1862 *
1863 * rule 1: select IPsec transport
1864 * rule 2: select MIPv6 RO or inbound trigger
1865 * rule 3: select IPsec tunnel
1866 * rule 4: others
1867 */
__xfrm6_tmpl_sort_cmp(const void * p)1868 static int __xfrm6_tmpl_sort_cmp(const void *p)
1869 {
1870 const struct xfrm_tmpl *v = p;
1871
1872 switch (v->mode) {
1873 case XFRM_MODE_TRANSPORT:
1874 return 1;
1875 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1876 case XFRM_MODE_ROUTEOPTIMIZATION:
1877 case XFRM_MODE_IN_TRIGGER:
1878 return 2;
1879 #endif
1880 case XFRM_MODE_TUNNEL:
1881 case XFRM_MODE_BEET:
1882 return 3;
1883 }
1884 return 4;
1885 }
1886 #else
__xfrm6_state_sort_cmp(const void * p)1887 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)1888 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1889
1890 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1891 __xfrm6_sort(void **dst, void **src, int n,
1892 int (*cmp)(const void *p), int maxclass)
1893 {
1894 int i;
1895
1896 for (i = 0; i < n; i++)
1897 dst[i] = src[i];
1898 }
1899 #endif /* CONFIG_IPV6 */
1900
1901 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)1902 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1903 unsigned short family)
1904 {
1905 int i;
1906
1907 if (family == AF_INET6)
1908 __xfrm6_sort((void **)dst, (void **)src, n,
1909 __xfrm6_tmpl_sort_cmp, 5);
1910 else
1911 for (i = 0; i < n; i++)
1912 dst[i] = src[i];
1913 }
1914
1915 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)1916 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1917 unsigned short family)
1918 {
1919 int i;
1920
1921 if (family == AF_INET6)
1922 __xfrm6_sort((void **)dst, (void **)src, n,
1923 __xfrm6_state_sort_cmp, 6);
1924 else
1925 for (i = 0; i < n; i++)
1926 dst[i] = src[i];
1927 }
1928 #endif
1929
1930 /* Silly enough, but I'm lazy to build resolution list */
1931
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1932 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1933 {
1934 int i;
1935
1936 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1937 struct xfrm_state *x;
1938
1939 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1940 if (x->km.seq == seq &&
1941 (mark & x->mark.m) == x->mark.v &&
1942 x->km.state == XFRM_STATE_ACQ) {
1943 xfrm_state_hold(x);
1944 return x;
1945 }
1946 }
1947 }
1948 return NULL;
1949 }
1950
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1951 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1952 {
1953 struct xfrm_state *x;
1954
1955 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1956 x = __xfrm_find_acq_byseq(net, mark, seq);
1957 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1958 return x;
1959 }
1960 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1961
xfrm_get_acqseq(void)1962 u32 xfrm_get_acqseq(void)
1963 {
1964 u32 res;
1965 static atomic_t acqseq;
1966
1967 do {
1968 res = atomic_inc_return(&acqseq);
1969 } while (!res);
1970
1971 return res;
1972 }
1973 EXPORT_SYMBOL(xfrm_get_acqseq);
1974
verify_spi_info(u8 proto,u32 min,u32 max)1975 int verify_spi_info(u8 proto, u32 min, u32 max)
1976 {
1977 switch (proto) {
1978 case IPPROTO_AH:
1979 case IPPROTO_ESP:
1980 break;
1981
1982 case IPPROTO_COMP:
1983 /* IPCOMP spi is 16-bits. */
1984 if (max >= 0x10000)
1985 return -EINVAL;
1986 break;
1987
1988 default:
1989 return -EINVAL;
1990 }
1991
1992 if (min > max)
1993 return -EINVAL;
1994
1995 return 0;
1996 }
1997 EXPORT_SYMBOL(verify_spi_info);
1998
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high)1999 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2000 {
2001 struct net *net = xs_net(x);
2002 unsigned int h;
2003 struct xfrm_state *x0;
2004 int err = -ENOENT;
2005 __be32 minspi = htonl(low);
2006 __be32 maxspi = htonl(high);
2007 __be32 newspi = 0;
2008 u32 mark = x->mark.v & x->mark.m;
2009
2010 spin_lock_bh(&x->lock);
2011 if (x->km.state == XFRM_STATE_DEAD)
2012 goto unlock;
2013
2014 err = 0;
2015 if (x->id.spi)
2016 goto unlock;
2017
2018 err = -ENOENT;
2019
2020 if (minspi == maxspi) {
2021 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2022 if (x0) {
2023 xfrm_state_put(x0);
2024 goto unlock;
2025 }
2026 newspi = minspi;
2027 } else {
2028 u32 spi = 0;
2029 for (h = 0; h < high-low+1; h++) {
2030 spi = low + prandom_u32()%(high-low+1);
2031 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2032 if (x0 == NULL) {
2033 newspi = htonl(spi);
2034 break;
2035 }
2036 xfrm_state_put(x0);
2037 }
2038 }
2039 if (newspi) {
2040 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2041 x->id.spi = newspi;
2042 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2043 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2044 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2045
2046 err = 0;
2047 }
2048
2049 unlock:
2050 spin_unlock_bh(&x->lock);
2051
2052 return err;
2053 }
2054 EXPORT_SYMBOL(xfrm_alloc_spi);
2055
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2056 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2057 struct xfrm_address_filter *filter)
2058 {
2059 if (filter) {
2060 if ((filter->family == AF_INET ||
2061 filter->family == AF_INET6) &&
2062 x->props.family != filter->family)
2063 return false;
2064
2065 return addr_match(&x->props.saddr, &filter->saddr,
2066 filter->splen) &&
2067 addr_match(&x->id.daddr, &filter->daddr,
2068 filter->dplen);
2069 }
2070 return true;
2071 }
2072
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2073 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2074 int (*func)(struct xfrm_state *, int, void*),
2075 void *data)
2076 {
2077 struct xfrm_state *state;
2078 struct xfrm_state_walk *x;
2079 int err = 0;
2080
2081 if (walk->seq != 0 && list_empty(&walk->all))
2082 return 0;
2083
2084 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2085 if (list_empty(&walk->all))
2086 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2087 else
2088 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2089 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2090 if (x->state == XFRM_STATE_DEAD)
2091 continue;
2092 state = container_of(x, struct xfrm_state, km);
2093 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2094 continue;
2095 if (!__xfrm_state_filter_match(state, walk->filter))
2096 continue;
2097 err = func(state, walk->seq, data);
2098 if (err) {
2099 list_move_tail(&walk->all, &x->all);
2100 goto out;
2101 }
2102 walk->seq++;
2103 }
2104 if (walk->seq == 0) {
2105 err = -ENOENT;
2106 goto out;
2107 }
2108 list_del_init(&walk->all);
2109 out:
2110 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2111 return err;
2112 }
2113 EXPORT_SYMBOL(xfrm_state_walk);
2114
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2115 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2116 struct xfrm_address_filter *filter)
2117 {
2118 INIT_LIST_HEAD(&walk->all);
2119 walk->proto = proto;
2120 walk->state = XFRM_STATE_DEAD;
2121 walk->seq = 0;
2122 walk->filter = filter;
2123 }
2124 EXPORT_SYMBOL(xfrm_state_walk_init);
2125
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2126 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2127 {
2128 kfree(walk->filter);
2129
2130 if (list_empty(&walk->all))
2131 return;
2132
2133 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2134 list_del(&walk->all);
2135 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2136 }
2137 EXPORT_SYMBOL(xfrm_state_walk_done);
2138
xfrm_replay_timer_handler(struct timer_list * t)2139 static void xfrm_replay_timer_handler(struct timer_list *t)
2140 {
2141 struct xfrm_state *x = from_timer(x, t, rtimer);
2142
2143 spin_lock(&x->lock);
2144
2145 if (x->km.state == XFRM_STATE_VALID) {
2146 if (xfrm_aevent_is_on(xs_net(x)))
2147 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2148 else
2149 x->xflags |= XFRM_TIME_DEFER;
2150 }
2151
2152 spin_unlock(&x->lock);
2153 }
2154
2155 static LIST_HEAD(xfrm_km_list);
2156
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2157 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2158 {
2159 struct xfrm_mgr *km;
2160
2161 rcu_read_lock();
2162 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2163 if (km->notify_policy)
2164 km->notify_policy(xp, dir, c);
2165 rcu_read_unlock();
2166 }
2167
km_state_notify(struct xfrm_state * x,const struct km_event * c)2168 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2169 {
2170 struct xfrm_mgr *km;
2171 rcu_read_lock();
2172 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2173 if (km->notify)
2174 km->notify(x, c);
2175 rcu_read_unlock();
2176 }
2177
2178 EXPORT_SYMBOL(km_policy_notify);
2179 EXPORT_SYMBOL(km_state_notify);
2180
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2181 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2182 {
2183 struct km_event c;
2184
2185 c.data.hard = hard;
2186 c.portid = portid;
2187 c.event = XFRM_MSG_EXPIRE;
2188 km_state_notify(x, &c);
2189 }
2190
2191 EXPORT_SYMBOL(km_state_expired);
2192 /*
2193 * We send to all registered managers regardless of failure
2194 * We are happy with one success
2195 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2196 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2197 {
2198 int err = -EINVAL, acqret;
2199 struct xfrm_mgr *km;
2200
2201 rcu_read_lock();
2202 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2203 acqret = km->acquire(x, t, pol);
2204 if (!acqret)
2205 err = acqret;
2206 }
2207 rcu_read_unlock();
2208 return err;
2209 }
2210 EXPORT_SYMBOL(km_query);
2211
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2212 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2213 {
2214 int err = -EINVAL;
2215 struct xfrm_mgr *km;
2216
2217 rcu_read_lock();
2218 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2219 if (km->new_mapping)
2220 err = km->new_mapping(x, ipaddr, sport);
2221 if (!err)
2222 break;
2223 }
2224 rcu_read_unlock();
2225 return err;
2226 }
2227 EXPORT_SYMBOL(km_new_mapping);
2228
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2229 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2230 {
2231 struct km_event c;
2232
2233 c.data.hard = hard;
2234 c.portid = portid;
2235 c.event = XFRM_MSG_POLEXPIRE;
2236 km_policy_notify(pol, dir, &c);
2237 }
2238 EXPORT_SYMBOL(km_policy_expired);
2239
2240 #ifdef CONFIG_XFRM_MIGRATE
km_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)2241 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2242 const struct xfrm_migrate *m, int num_migrate,
2243 const struct xfrm_kmaddress *k,
2244 const struct xfrm_encap_tmpl *encap)
2245 {
2246 int err = -EINVAL;
2247 int ret;
2248 struct xfrm_mgr *km;
2249
2250 rcu_read_lock();
2251 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2252 if (km->migrate) {
2253 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2254 encap);
2255 if (!ret)
2256 err = ret;
2257 }
2258 }
2259 rcu_read_unlock();
2260 return err;
2261 }
2262 EXPORT_SYMBOL(km_migrate);
2263 #endif
2264
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2265 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2266 {
2267 int err = -EINVAL;
2268 int ret;
2269 struct xfrm_mgr *km;
2270
2271 rcu_read_lock();
2272 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2273 if (km->report) {
2274 ret = km->report(net, proto, sel, addr);
2275 if (!ret)
2276 err = ret;
2277 }
2278 }
2279 rcu_read_unlock();
2280 return err;
2281 }
2282 EXPORT_SYMBOL(km_report);
2283
km_is_alive(const struct km_event * c)2284 static bool km_is_alive(const struct km_event *c)
2285 {
2286 struct xfrm_mgr *km;
2287 bool is_alive = false;
2288
2289 rcu_read_lock();
2290 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2291 if (km->is_alive && km->is_alive(c)) {
2292 is_alive = true;
2293 break;
2294 }
2295 }
2296 rcu_read_unlock();
2297
2298 return is_alive;
2299 }
2300
2301 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2302 static DEFINE_SPINLOCK(xfrm_translator_lock);
2303 static struct xfrm_translator __rcu *xfrm_translator;
2304
xfrm_get_translator(void)2305 struct xfrm_translator *xfrm_get_translator(void)
2306 {
2307 struct xfrm_translator *xtr;
2308
2309 rcu_read_lock();
2310 xtr = rcu_dereference(xfrm_translator);
2311 if (unlikely(!xtr))
2312 goto out;
2313 if (!try_module_get(xtr->owner))
2314 xtr = NULL;
2315 out:
2316 rcu_read_unlock();
2317 return xtr;
2318 }
2319 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2320
xfrm_put_translator(struct xfrm_translator * xtr)2321 void xfrm_put_translator(struct xfrm_translator *xtr)
2322 {
2323 module_put(xtr->owner);
2324 }
2325 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2326
xfrm_register_translator(struct xfrm_translator * xtr)2327 int xfrm_register_translator(struct xfrm_translator *xtr)
2328 {
2329 int err = 0;
2330
2331 spin_lock_bh(&xfrm_translator_lock);
2332 if (unlikely(xfrm_translator != NULL))
2333 err = -EEXIST;
2334 else
2335 rcu_assign_pointer(xfrm_translator, xtr);
2336 spin_unlock_bh(&xfrm_translator_lock);
2337
2338 return err;
2339 }
2340 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2341
xfrm_unregister_translator(struct xfrm_translator * xtr)2342 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2343 {
2344 int err = 0;
2345
2346 spin_lock_bh(&xfrm_translator_lock);
2347 if (likely(xfrm_translator != NULL)) {
2348 if (rcu_access_pointer(xfrm_translator) != xtr)
2349 err = -EINVAL;
2350 else
2351 RCU_INIT_POINTER(xfrm_translator, NULL);
2352 }
2353 spin_unlock_bh(&xfrm_translator_lock);
2354 synchronize_rcu();
2355
2356 return err;
2357 }
2358 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2359 #endif
2360
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2361 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2362 {
2363 int err;
2364 u8 *data;
2365 struct xfrm_mgr *km;
2366 struct xfrm_policy *pol = NULL;
2367
2368 if (sockptr_is_null(optval) && !optlen) {
2369 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2370 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2371 __sk_dst_reset(sk);
2372 return 0;
2373 }
2374
2375 if (optlen <= 0 || optlen > PAGE_SIZE)
2376 return -EMSGSIZE;
2377
2378 data = memdup_sockptr(optval, optlen);
2379 if (IS_ERR(data))
2380 return PTR_ERR(data);
2381
2382 if (in_compat_syscall()) {
2383 struct xfrm_translator *xtr = xfrm_get_translator();
2384
2385 if (!xtr) {
2386 kfree(data);
2387 return -EOPNOTSUPP;
2388 }
2389
2390 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2391 xfrm_put_translator(xtr);
2392 if (err) {
2393 kfree(data);
2394 return err;
2395 }
2396 }
2397
2398 err = -EINVAL;
2399 rcu_read_lock();
2400 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2401 pol = km->compile_policy(sk, optname, data,
2402 optlen, &err);
2403 if (err >= 0)
2404 break;
2405 }
2406 rcu_read_unlock();
2407
2408 if (err >= 0) {
2409 xfrm_sk_policy_insert(sk, err, pol);
2410 xfrm_pol_put(pol);
2411 __sk_dst_reset(sk);
2412 err = 0;
2413 }
2414
2415 kfree(data);
2416 return err;
2417 }
2418 EXPORT_SYMBOL(xfrm_user_policy);
2419
2420 static DEFINE_SPINLOCK(xfrm_km_lock);
2421
xfrm_register_km(struct xfrm_mgr * km)2422 int xfrm_register_km(struct xfrm_mgr *km)
2423 {
2424 spin_lock_bh(&xfrm_km_lock);
2425 list_add_tail_rcu(&km->list, &xfrm_km_list);
2426 spin_unlock_bh(&xfrm_km_lock);
2427 return 0;
2428 }
2429 EXPORT_SYMBOL(xfrm_register_km);
2430
xfrm_unregister_km(struct xfrm_mgr * km)2431 int xfrm_unregister_km(struct xfrm_mgr *km)
2432 {
2433 spin_lock_bh(&xfrm_km_lock);
2434 list_del_rcu(&km->list);
2435 spin_unlock_bh(&xfrm_km_lock);
2436 synchronize_rcu();
2437 return 0;
2438 }
2439 EXPORT_SYMBOL(xfrm_unregister_km);
2440
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2441 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2442 {
2443 int err = 0;
2444
2445 if (WARN_ON(afinfo->family >= NPROTO))
2446 return -EAFNOSUPPORT;
2447
2448 spin_lock_bh(&xfrm_state_afinfo_lock);
2449 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2450 err = -EEXIST;
2451 else
2452 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2453 spin_unlock_bh(&xfrm_state_afinfo_lock);
2454 return err;
2455 }
2456 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2457
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2458 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2459 {
2460 int err = 0, family = afinfo->family;
2461
2462 if (WARN_ON(family >= NPROTO))
2463 return -EAFNOSUPPORT;
2464
2465 spin_lock_bh(&xfrm_state_afinfo_lock);
2466 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2467 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2468 err = -EINVAL;
2469 else
2470 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2471 }
2472 spin_unlock_bh(&xfrm_state_afinfo_lock);
2473 synchronize_rcu();
2474 return err;
2475 }
2476 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2477
xfrm_state_afinfo_get_rcu(unsigned int family)2478 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2479 {
2480 if (unlikely(family >= NPROTO))
2481 return NULL;
2482
2483 return rcu_dereference(xfrm_state_afinfo[family]);
2484 }
2485 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2486
xfrm_state_get_afinfo(unsigned int family)2487 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2488 {
2489 struct xfrm_state_afinfo *afinfo;
2490 if (unlikely(family >= NPROTO))
2491 return NULL;
2492 rcu_read_lock();
2493 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2494 if (unlikely(!afinfo))
2495 rcu_read_unlock();
2496 return afinfo;
2497 }
2498
xfrm_flush_gc(void)2499 void xfrm_flush_gc(void)
2500 {
2501 flush_work(&xfrm_state_gc_work);
2502 }
2503 EXPORT_SYMBOL(xfrm_flush_gc);
2504
2505 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2506 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2507 {
2508 if (x->tunnel) {
2509 struct xfrm_state *t = x->tunnel;
2510
2511 if (atomic_read(&t->tunnel_users) == 2)
2512 xfrm_state_delete(t);
2513 atomic_dec(&t->tunnel_users);
2514 xfrm_state_put_sync(t);
2515 x->tunnel = NULL;
2516 }
2517 }
2518 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2519
xfrm_state_mtu(struct xfrm_state * x,int mtu)2520 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2521 {
2522 const struct xfrm_type *type = READ_ONCE(x->type);
2523 struct crypto_aead *aead;
2524 u32 blksize, net_adj = 0;
2525
2526 if (x->km.state != XFRM_STATE_VALID ||
2527 !type || type->proto != IPPROTO_ESP)
2528 return mtu - x->props.header_len;
2529
2530 aead = x->data;
2531 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2532
2533 switch (x->props.mode) {
2534 case XFRM_MODE_TRANSPORT:
2535 case XFRM_MODE_BEET:
2536 if (x->props.family == AF_INET)
2537 net_adj = sizeof(struct iphdr);
2538 else if (x->props.family == AF_INET6)
2539 net_adj = sizeof(struct ipv6hdr);
2540 break;
2541 case XFRM_MODE_TUNNEL:
2542 break;
2543 default:
2544 WARN_ON_ONCE(1);
2545 break;
2546 }
2547
2548 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2549 net_adj) & ~(blksize - 1)) + net_adj - 2;
2550 }
2551 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2552
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload)2553 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2554 {
2555 const struct xfrm_mode *inner_mode;
2556 const struct xfrm_mode *outer_mode;
2557 int family = x->props.family;
2558 int err;
2559
2560 if (family == AF_INET &&
2561 xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
2562 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2563
2564 err = -EPROTONOSUPPORT;
2565
2566 if (x->sel.family != AF_UNSPEC) {
2567 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2568 if (inner_mode == NULL)
2569 goto error;
2570
2571 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2572 family != x->sel.family)
2573 goto error;
2574
2575 x->inner_mode = *inner_mode;
2576 } else {
2577 const struct xfrm_mode *inner_mode_iaf;
2578 int iafamily = AF_INET;
2579
2580 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2581 if (inner_mode == NULL)
2582 goto error;
2583
2584 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2585 goto error;
2586
2587 x->inner_mode = *inner_mode;
2588
2589 if (x->props.family == AF_INET)
2590 iafamily = AF_INET6;
2591
2592 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2593 if (inner_mode_iaf) {
2594 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2595 x->inner_mode_iaf = *inner_mode_iaf;
2596 }
2597 }
2598
2599 x->type = xfrm_get_type(x->id.proto, family);
2600 if (x->type == NULL)
2601 goto error;
2602
2603 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2604
2605 err = x->type->init_state(x);
2606 if (err)
2607 goto error;
2608
2609 outer_mode = xfrm_get_mode(x->props.mode, family);
2610 if (!outer_mode) {
2611 err = -EPROTONOSUPPORT;
2612 goto error;
2613 }
2614
2615 x->outer_mode = *outer_mode;
2616 if (init_replay) {
2617 err = xfrm_init_replay(x);
2618 if (err)
2619 goto error;
2620 }
2621
2622 error:
2623 return err;
2624 }
2625
2626 EXPORT_SYMBOL(__xfrm_init_state);
2627
xfrm_init_state(struct xfrm_state * x)2628 int xfrm_init_state(struct xfrm_state *x)
2629 {
2630 int err;
2631
2632 err = __xfrm_init_state(x, true, false);
2633 if (!err)
2634 x->km.state = XFRM_STATE_VALID;
2635
2636 return err;
2637 }
2638
2639 EXPORT_SYMBOL(xfrm_init_state);
2640
xfrm_state_init(struct net * net)2641 int __net_init xfrm_state_init(struct net *net)
2642 {
2643 unsigned int sz;
2644
2645 if (net_eq(net, &init_net))
2646 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2647 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2648
2649 INIT_LIST_HEAD(&net->xfrm.state_all);
2650
2651 sz = sizeof(struct hlist_head) * 8;
2652
2653 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2654 if (!net->xfrm.state_bydst)
2655 goto out_bydst;
2656 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2657 if (!net->xfrm.state_bysrc)
2658 goto out_bysrc;
2659 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2660 if (!net->xfrm.state_byspi)
2661 goto out_byspi;
2662 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2663
2664 net->xfrm.state_num = 0;
2665 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2666 spin_lock_init(&net->xfrm.xfrm_state_lock);
2667 return 0;
2668
2669 out_byspi:
2670 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2671 out_bysrc:
2672 xfrm_hash_free(net->xfrm.state_bydst, sz);
2673 out_bydst:
2674 return -ENOMEM;
2675 }
2676
xfrm_state_fini(struct net * net)2677 void xfrm_state_fini(struct net *net)
2678 {
2679 unsigned int sz;
2680
2681 flush_work(&net->xfrm.state_hash_work);
2682 flush_work(&xfrm_state_gc_work);
2683 xfrm_state_flush(net, 0, false, true);
2684
2685 WARN_ON(!list_empty(&net->xfrm.state_all));
2686
2687 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2688 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2689 xfrm_hash_free(net->xfrm.state_byspi, sz);
2690 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2691 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2692 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2693 xfrm_hash_free(net->xfrm.state_bydst, sz);
2694 }
2695
2696 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2697 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2698 struct audit_buffer *audit_buf)
2699 {
2700 struct xfrm_sec_ctx *ctx = x->security;
2701 u32 spi = ntohl(x->id.spi);
2702
2703 if (ctx)
2704 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2705 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2706
2707 switch (x->props.family) {
2708 case AF_INET:
2709 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2710 &x->props.saddr.a4, &x->id.daddr.a4);
2711 break;
2712 case AF_INET6:
2713 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2714 x->props.saddr.a6, x->id.daddr.a6);
2715 break;
2716 }
2717
2718 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2719 }
2720
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2721 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2722 struct audit_buffer *audit_buf)
2723 {
2724 const struct iphdr *iph4;
2725 const struct ipv6hdr *iph6;
2726
2727 switch (family) {
2728 case AF_INET:
2729 iph4 = ip_hdr(skb);
2730 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2731 &iph4->saddr, &iph4->daddr);
2732 break;
2733 case AF_INET6:
2734 iph6 = ipv6_hdr(skb);
2735 audit_log_format(audit_buf,
2736 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2737 &iph6->saddr, &iph6->daddr,
2738 iph6->flow_lbl[0] & 0x0f,
2739 iph6->flow_lbl[1],
2740 iph6->flow_lbl[2]);
2741 break;
2742 }
2743 }
2744
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2745 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2746 {
2747 struct audit_buffer *audit_buf;
2748
2749 audit_buf = xfrm_audit_start("SAD-add");
2750 if (audit_buf == NULL)
2751 return;
2752 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2753 xfrm_audit_helper_sainfo(x, audit_buf);
2754 audit_log_format(audit_buf, " res=%u", result);
2755 audit_log_end(audit_buf);
2756 }
2757 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2758
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)2759 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2760 {
2761 struct audit_buffer *audit_buf;
2762
2763 audit_buf = xfrm_audit_start("SAD-delete");
2764 if (audit_buf == NULL)
2765 return;
2766 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2767 xfrm_audit_helper_sainfo(x, audit_buf);
2768 audit_log_format(audit_buf, " res=%u", result);
2769 audit_log_end(audit_buf);
2770 }
2771 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2772
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)2773 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2774 struct sk_buff *skb)
2775 {
2776 struct audit_buffer *audit_buf;
2777 u32 spi;
2778
2779 audit_buf = xfrm_audit_start("SA-replay-overflow");
2780 if (audit_buf == NULL)
2781 return;
2782 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2783 /* don't record the sequence number because it's inherent in this kind
2784 * of audit message */
2785 spi = ntohl(x->id.spi);
2786 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2787 audit_log_end(audit_buf);
2788 }
2789 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2790
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)2791 void xfrm_audit_state_replay(struct xfrm_state *x,
2792 struct sk_buff *skb, __be32 net_seq)
2793 {
2794 struct audit_buffer *audit_buf;
2795 u32 spi;
2796
2797 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2798 if (audit_buf == NULL)
2799 return;
2800 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2801 spi = ntohl(x->id.spi);
2802 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2803 spi, spi, ntohl(net_seq));
2804 audit_log_end(audit_buf);
2805 }
2806 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2807
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)2808 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2809 {
2810 struct audit_buffer *audit_buf;
2811
2812 audit_buf = xfrm_audit_start("SA-notfound");
2813 if (audit_buf == NULL)
2814 return;
2815 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2816 audit_log_end(audit_buf);
2817 }
2818 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2819
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)2820 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2821 __be32 net_spi, __be32 net_seq)
2822 {
2823 struct audit_buffer *audit_buf;
2824 u32 spi;
2825
2826 audit_buf = xfrm_audit_start("SA-notfound");
2827 if (audit_buf == NULL)
2828 return;
2829 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2830 spi = ntohl(net_spi);
2831 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2832 spi, spi, ntohl(net_seq));
2833 audit_log_end(audit_buf);
2834 }
2835 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2836
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)2837 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2838 struct sk_buff *skb, u8 proto)
2839 {
2840 struct audit_buffer *audit_buf;
2841 __be32 net_spi;
2842 __be32 net_seq;
2843
2844 audit_buf = xfrm_audit_start("SA-icv-failure");
2845 if (audit_buf == NULL)
2846 return;
2847 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2848 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2849 u32 spi = ntohl(net_spi);
2850 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2851 spi, spi, ntohl(net_seq));
2852 }
2853 audit_log_end(audit_buf);
2854 }
2855 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2856 #endif /* CONFIG_AUDITSYSCALL */
2857
