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 struct kmem_cache *xfrm_state_cache __ro_after_init;
48
49 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
50 static HLIST_HEAD(xfrm_state_gc_list);
51
xfrm_state_hold_rcu(struct xfrm_state __rcu * x)52 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
53 {
54 return refcount_inc_not_zero(&x->refcnt);
55 }
56
xfrm_dst_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u32 reqid,unsigned short family)57 static inline unsigned int xfrm_dst_hash(struct net *net,
58 const xfrm_address_t *daddr,
59 const xfrm_address_t *saddr,
60 u32 reqid,
61 unsigned short family)
62 {
63 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
64 }
65
xfrm_src_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)66 static inline unsigned int xfrm_src_hash(struct net *net,
67 const xfrm_address_t *daddr,
68 const xfrm_address_t *saddr,
69 unsigned short family)
70 {
71 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
72 }
73
74 static inline unsigned int
xfrm_spi_hash(struct net * net,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)75 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
76 __be32 spi, u8 proto, unsigned short family)
77 {
78 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
79 }
80
xfrm_hash_transfer(struct hlist_head * list,struct hlist_head * ndsttable,struct hlist_head * nsrctable,struct hlist_head * nspitable,unsigned int nhashmask)81 static void xfrm_hash_transfer(struct hlist_head *list,
82 struct hlist_head *ndsttable,
83 struct hlist_head *nsrctable,
84 struct hlist_head *nspitable,
85 unsigned int nhashmask)
86 {
87 struct hlist_node *tmp;
88 struct xfrm_state *x;
89
90 hlist_for_each_entry_safe(x, tmp, list, bydst) {
91 unsigned int h;
92
93 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
94 x->props.reqid, x->props.family,
95 nhashmask);
96 hlist_add_head_rcu(&x->bydst, ndsttable + h);
97
98 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
99 x->props.family,
100 nhashmask);
101 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
102
103 if (x->id.spi) {
104 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
105 x->id.proto, x->props.family,
106 nhashmask);
107 hlist_add_head_rcu(&x->byspi, nspitable + h);
108 }
109 }
110 }
111
xfrm_hash_new_size(unsigned int state_hmask)112 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
113 {
114 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
115 }
116
xfrm_hash_resize(struct work_struct * work)117 static void xfrm_hash_resize(struct work_struct *work)
118 {
119 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
120 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
121 unsigned long nsize, osize;
122 unsigned int nhashmask, ohashmask;
123 int i;
124
125 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
126 ndst = xfrm_hash_alloc(nsize);
127 if (!ndst)
128 return;
129 nsrc = xfrm_hash_alloc(nsize);
130 if (!nsrc) {
131 xfrm_hash_free(ndst, nsize);
132 return;
133 }
134 nspi = xfrm_hash_alloc(nsize);
135 if (!nspi) {
136 xfrm_hash_free(ndst, nsize);
137 xfrm_hash_free(nsrc, nsize);
138 return;
139 }
140
141 spin_lock_bh(&net->xfrm.xfrm_state_lock);
142 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
143
144 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
145 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
146 for (i = net->xfrm.state_hmask; i >= 0; i--)
147 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
148
149 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
150 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
151 ohashmask = net->xfrm.state_hmask;
152
153 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
154 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
155 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
156 net->xfrm.state_hmask = nhashmask;
157
158 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
159 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
160
161 osize = (ohashmask + 1) * sizeof(struct hlist_head);
162
163 synchronize_rcu();
164
165 xfrm_hash_free(odst, osize);
166 xfrm_hash_free(osrc, osize);
167 xfrm_hash_free(ospi, osize);
168 }
169
170 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
171 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
172
173 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
174
175 int __xfrm_state_delete(struct xfrm_state *x);
176
177 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
178 static bool km_is_alive(const struct km_event *c);
179 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
180
xfrm_register_type(const struct xfrm_type * type,unsigned short family)181 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
182 {
183 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
184 int err = 0;
185
186 if (!afinfo)
187 return -EAFNOSUPPORT;
188
189 #define X(afi, T, name) do { \
190 WARN_ON((afi)->type_ ## name); \
191 (afi)->type_ ## name = (T); \
192 } while (0)
193
194 switch (type->proto) {
195 case IPPROTO_COMP:
196 X(afinfo, type, comp);
197 break;
198 case IPPROTO_AH:
199 X(afinfo, type, ah);
200 break;
201 case IPPROTO_ESP:
202 X(afinfo, type, esp);
203 break;
204 case IPPROTO_IPIP:
205 X(afinfo, type, ipip);
206 break;
207 case IPPROTO_DSTOPTS:
208 X(afinfo, type, dstopts);
209 break;
210 case IPPROTO_ROUTING:
211 X(afinfo, type, routing);
212 break;
213 case IPPROTO_IPV6:
214 X(afinfo, type, ipip6);
215 break;
216 default:
217 WARN_ON(1);
218 err = -EPROTONOSUPPORT;
219 break;
220 }
221 #undef X
222 rcu_read_unlock();
223 return err;
224 }
225 EXPORT_SYMBOL(xfrm_register_type);
226
xfrm_unregister_type(const struct xfrm_type * type,unsigned short family)227 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
228 {
229 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
230
231 if (unlikely(afinfo == NULL))
232 return;
233
234 #define X(afi, T, name) do { \
235 WARN_ON((afi)->type_ ## name != (T)); \
236 (afi)->type_ ## name = NULL; \
237 } while (0)
238
239 switch (type->proto) {
240 case IPPROTO_COMP:
241 X(afinfo, type, comp);
242 break;
243 case IPPROTO_AH:
244 X(afinfo, type, ah);
245 break;
246 case IPPROTO_ESP:
247 X(afinfo, type, esp);
248 break;
249 case IPPROTO_IPIP:
250 X(afinfo, type, ipip);
251 break;
252 case IPPROTO_DSTOPTS:
253 X(afinfo, type, dstopts);
254 break;
255 case IPPROTO_ROUTING:
256 X(afinfo, type, routing);
257 break;
258 case IPPROTO_IPV6:
259 X(afinfo, type, ipip6);
260 break;
261 default:
262 WARN_ON(1);
263 break;
264 }
265 #undef X
266 rcu_read_unlock();
267 }
268 EXPORT_SYMBOL(xfrm_unregister_type);
269
xfrm_get_type(u8 proto,unsigned short family)270 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
271 {
272 const struct xfrm_type *type = NULL;
273 struct xfrm_state_afinfo *afinfo;
274 int modload_attempted = 0;
275
276 retry:
277 afinfo = xfrm_state_get_afinfo(family);
278 if (unlikely(afinfo == NULL))
279 return NULL;
280
281 switch (proto) {
282 case IPPROTO_COMP:
283 type = afinfo->type_comp;
284 break;
285 case IPPROTO_AH:
286 type = afinfo->type_ah;
287 break;
288 case IPPROTO_ESP:
289 type = afinfo->type_esp;
290 break;
291 case IPPROTO_IPIP:
292 type = afinfo->type_ipip;
293 break;
294 case IPPROTO_DSTOPTS:
295 type = afinfo->type_dstopts;
296 break;
297 case IPPROTO_ROUTING:
298 type = afinfo->type_routing;
299 break;
300 case IPPROTO_IPV6:
301 type = afinfo->type_ipip6;
302 break;
303 default:
304 break;
305 }
306
307 if (unlikely(type && !try_module_get(type->owner)))
308 type = NULL;
309
310 rcu_read_unlock();
311
312 if (!type && !modload_attempted) {
313 request_module("xfrm-type-%d-%d", family, proto);
314 modload_attempted = 1;
315 goto retry;
316 }
317
318 return type;
319 }
320
xfrm_put_type(const struct xfrm_type * type)321 static void xfrm_put_type(const struct xfrm_type *type)
322 {
323 module_put(type->owner);
324 }
325
xfrm_register_type_offload(const struct xfrm_type_offload * type,unsigned short family)326 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
327 unsigned short family)
328 {
329 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
330 int err = 0;
331
332 if (unlikely(afinfo == NULL))
333 return -EAFNOSUPPORT;
334
335 switch (type->proto) {
336 case IPPROTO_ESP:
337 WARN_ON(afinfo->type_offload_esp);
338 afinfo->type_offload_esp = type;
339 break;
340 default:
341 WARN_ON(1);
342 err = -EPROTONOSUPPORT;
343 break;
344 }
345
346 rcu_read_unlock();
347 return err;
348 }
349 EXPORT_SYMBOL(xfrm_register_type_offload);
350
xfrm_unregister_type_offload(const struct xfrm_type_offload * type,unsigned short family)351 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
352 unsigned short family)
353 {
354 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
355
356 if (unlikely(afinfo == NULL))
357 return;
358
359 switch (type->proto) {
360 case IPPROTO_ESP:
361 WARN_ON(afinfo->type_offload_esp != type);
362 afinfo->type_offload_esp = NULL;
363 break;
364 default:
365 WARN_ON(1);
366 break;
367 }
368 rcu_read_unlock();
369 }
370 EXPORT_SYMBOL(xfrm_unregister_type_offload);
371
372 static const struct xfrm_type_offload *
xfrm_get_type_offload(u8 proto,unsigned short family,bool try_load)373 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
374 {
375 const struct xfrm_type_offload *type = NULL;
376 struct xfrm_state_afinfo *afinfo;
377
378 retry:
379 afinfo = xfrm_state_get_afinfo(family);
380 if (unlikely(afinfo == NULL))
381 return NULL;
382
383 switch (proto) {
384 case IPPROTO_ESP:
385 type = afinfo->type_offload_esp;
386 break;
387 default:
388 break;
389 }
390
391 if ((type && !try_module_get(type->owner)))
392 type = NULL;
393
394 rcu_read_unlock();
395
396 if (!type && try_load) {
397 request_module("xfrm-offload-%d-%d", family, proto);
398 try_load = false;
399 goto retry;
400 }
401
402 return type;
403 }
404
xfrm_put_type_offload(const struct xfrm_type_offload * type)405 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
406 {
407 module_put(type->owner);
408 }
409
410 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
411 [XFRM_MODE_BEET] = {
412 .encap = XFRM_MODE_BEET,
413 .flags = XFRM_MODE_FLAG_TUNNEL,
414 .family = AF_INET,
415 },
416 [XFRM_MODE_TRANSPORT] = {
417 .encap = XFRM_MODE_TRANSPORT,
418 .family = AF_INET,
419 },
420 [XFRM_MODE_TUNNEL] = {
421 .encap = XFRM_MODE_TUNNEL,
422 .flags = XFRM_MODE_FLAG_TUNNEL,
423 .family = AF_INET,
424 },
425 };
426
427 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
428 [XFRM_MODE_BEET] = {
429 .encap = XFRM_MODE_BEET,
430 .flags = XFRM_MODE_FLAG_TUNNEL,
431 .family = AF_INET6,
432 },
433 [XFRM_MODE_ROUTEOPTIMIZATION] = {
434 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
435 .family = AF_INET6,
436 },
437 [XFRM_MODE_TRANSPORT] = {
438 .encap = XFRM_MODE_TRANSPORT,
439 .family = AF_INET6,
440 },
441 [XFRM_MODE_TUNNEL] = {
442 .encap = XFRM_MODE_TUNNEL,
443 .flags = XFRM_MODE_FLAG_TUNNEL,
444 .family = AF_INET6,
445 },
446 };
447
xfrm_get_mode(unsigned int encap,int family)448 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
449 {
450 const struct xfrm_mode *mode;
451
452 if (unlikely(encap >= XFRM_MODE_MAX))
453 return NULL;
454
455 switch (family) {
456 case AF_INET:
457 mode = &xfrm4_mode_map[encap];
458 if (mode->family == family)
459 return mode;
460 break;
461 case AF_INET6:
462 mode = &xfrm6_mode_map[encap];
463 if (mode->family == family)
464 return mode;
465 break;
466 default:
467 break;
468 }
469
470 return NULL;
471 }
472
xfrm_state_free(struct xfrm_state * x)473 void xfrm_state_free(struct xfrm_state *x)
474 {
475 kmem_cache_free(xfrm_state_cache, x);
476 }
477 EXPORT_SYMBOL(xfrm_state_free);
478
___xfrm_state_destroy(struct xfrm_state * x)479 static void ___xfrm_state_destroy(struct xfrm_state *x)
480 {
481 hrtimer_cancel(&x->mtimer);
482 del_timer_sync(&x->rtimer);
483 kfree(x->aead);
484 kfree(x->aalg);
485 kfree(x->ealg);
486 kfree(x->calg);
487 kfree(x->encap);
488 kfree(x->coaddr);
489 kfree(x->replay_esn);
490 kfree(x->preplay_esn);
491 if (x->type_offload)
492 xfrm_put_type_offload(x->type_offload);
493 if (x->type) {
494 x->type->destructor(x);
495 xfrm_put_type(x->type);
496 }
497 if (x->xfrag.page)
498 put_page(x->xfrag.page);
499 xfrm_dev_state_free(x);
500 security_xfrm_state_free(x);
501 xfrm_state_free(x);
502 }
503
xfrm_state_gc_task(struct work_struct * work)504 static void xfrm_state_gc_task(struct work_struct *work)
505 {
506 struct xfrm_state *x;
507 struct hlist_node *tmp;
508 struct hlist_head gc_list;
509
510 spin_lock_bh(&xfrm_state_gc_lock);
511 hlist_move_list(&xfrm_state_gc_list, &gc_list);
512 spin_unlock_bh(&xfrm_state_gc_lock);
513
514 synchronize_rcu();
515
516 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
517 ___xfrm_state_destroy(x);
518 }
519
xfrm_timer_handler(struct hrtimer * me)520 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
521 {
522 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
523 enum hrtimer_restart ret = HRTIMER_NORESTART;
524 time64_t now = ktime_get_real_seconds();
525 time64_t next = TIME64_MAX;
526 int warn = 0;
527 int err = 0;
528
529 spin_lock(&x->lock);
530 if (x->km.state == XFRM_STATE_DEAD)
531 goto out;
532 if (x->km.state == XFRM_STATE_EXPIRED)
533 goto expired;
534 if (x->lft.hard_add_expires_seconds) {
535 long tmo = x->lft.hard_add_expires_seconds +
536 x->curlft.add_time - now;
537 if (tmo <= 0) {
538 if (x->xflags & XFRM_SOFT_EXPIRE) {
539 /* enter hard expire without soft expire first?!
540 * setting a new date could trigger this.
541 * workaround: fix x->curflt.add_time by below:
542 */
543 x->curlft.add_time = now - x->saved_tmo - 1;
544 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
545 } else
546 goto expired;
547 }
548 if (tmo < next)
549 next = tmo;
550 }
551 if (x->lft.hard_use_expires_seconds) {
552 long tmo = x->lft.hard_use_expires_seconds +
553 (x->curlft.use_time ? : now) - now;
554 if (tmo <= 0)
555 goto expired;
556 if (tmo < next)
557 next = tmo;
558 }
559 if (x->km.dying)
560 goto resched;
561 if (x->lft.soft_add_expires_seconds) {
562 long tmo = x->lft.soft_add_expires_seconds +
563 x->curlft.add_time - now;
564 if (tmo <= 0) {
565 warn = 1;
566 x->xflags &= ~XFRM_SOFT_EXPIRE;
567 } else if (tmo < next) {
568 next = tmo;
569 x->xflags |= XFRM_SOFT_EXPIRE;
570 x->saved_tmo = tmo;
571 }
572 }
573 if (x->lft.soft_use_expires_seconds) {
574 long tmo = x->lft.soft_use_expires_seconds +
575 (x->curlft.use_time ? : now) - now;
576 if (tmo <= 0)
577 warn = 1;
578 else if (tmo < next)
579 next = tmo;
580 }
581
582 x->km.dying = warn;
583 if (warn)
584 km_state_expired(x, 0, 0);
585 resched:
586 if (next != TIME64_MAX) {
587 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
588 ret = HRTIMER_RESTART;
589 }
590
591 goto out;
592
593 expired:
594 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
595 x->km.state = XFRM_STATE_EXPIRED;
596
597 err = __xfrm_state_delete(x);
598 if (!err)
599 km_state_expired(x, 1, 0);
600
601 xfrm_audit_state_delete(x, err ? 0 : 1, true);
602
603 out:
604 spin_unlock(&x->lock);
605 return ret;
606 }
607
608 static void xfrm_replay_timer_handler(struct timer_list *t);
609
xfrm_state_alloc(struct net * net)610 struct xfrm_state *xfrm_state_alloc(struct net *net)
611 {
612 struct xfrm_state *x;
613
614 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
615
616 if (x) {
617 write_pnet(&x->xs_net, net);
618 refcount_set(&x->refcnt, 1);
619 atomic_set(&x->tunnel_users, 0);
620 INIT_LIST_HEAD(&x->km.all);
621 INIT_HLIST_NODE(&x->bydst);
622 INIT_HLIST_NODE(&x->bysrc);
623 INIT_HLIST_NODE(&x->byspi);
624 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
625 x->mtimer.function = xfrm_timer_handler;
626 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
627 x->curlft.add_time = ktime_get_real_seconds();
628 x->lft.soft_byte_limit = XFRM_INF;
629 x->lft.soft_packet_limit = XFRM_INF;
630 x->lft.hard_byte_limit = XFRM_INF;
631 x->lft.hard_packet_limit = XFRM_INF;
632 x->replay_maxage = 0;
633 x->replay_maxdiff = 0;
634 spin_lock_init(&x->lock);
635 }
636 return x;
637 }
638 EXPORT_SYMBOL(xfrm_state_alloc);
639
__xfrm_state_destroy(struct xfrm_state * x,bool sync)640 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
641 {
642 WARN_ON(x->km.state != XFRM_STATE_DEAD);
643
644 if (sync) {
645 synchronize_rcu();
646 ___xfrm_state_destroy(x);
647 } else {
648 spin_lock_bh(&xfrm_state_gc_lock);
649 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
650 spin_unlock_bh(&xfrm_state_gc_lock);
651 schedule_work(&xfrm_state_gc_work);
652 }
653 }
654 EXPORT_SYMBOL(__xfrm_state_destroy);
655
__xfrm_state_delete(struct xfrm_state * x)656 int __xfrm_state_delete(struct xfrm_state *x)
657 {
658 struct net *net = xs_net(x);
659 int err = -ESRCH;
660
661 if (x->km.state != XFRM_STATE_DEAD) {
662 x->km.state = XFRM_STATE_DEAD;
663 spin_lock(&net->xfrm.xfrm_state_lock);
664 list_del(&x->km.all);
665 hlist_del_rcu(&x->bydst);
666 hlist_del_rcu(&x->bysrc);
667 if (x->id.spi)
668 hlist_del_rcu(&x->byspi);
669 net->xfrm.state_num--;
670 spin_unlock(&net->xfrm.xfrm_state_lock);
671
672 if (x->encap_sk)
673 sock_put(rcu_dereference_raw(x->encap_sk));
674
675 xfrm_dev_state_delete(x);
676
677 /* All xfrm_state objects are created by xfrm_state_alloc.
678 * The xfrm_state_alloc call gives a reference, and that
679 * is what we are dropping here.
680 */
681 xfrm_state_put(x);
682 err = 0;
683 }
684
685 return err;
686 }
687 EXPORT_SYMBOL(__xfrm_state_delete);
688
xfrm_state_delete(struct xfrm_state * x)689 int xfrm_state_delete(struct xfrm_state *x)
690 {
691 int err;
692
693 spin_lock_bh(&x->lock);
694 err = __xfrm_state_delete(x);
695 spin_unlock_bh(&x->lock);
696
697 return err;
698 }
699 EXPORT_SYMBOL(xfrm_state_delete);
700
701 #ifdef CONFIG_SECURITY_NETWORK_XFRM
702 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)703 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
704 {
705 int i, err = 0;
706
707 for (i = 0; i <= net->xfrm.state_hmask; i++) {
708 struct xfrm_state *x;
709
710 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
711 if (xfrm_id_proto_match(x->id.proto, proto) &&
712 (err = security_xfrm_state_delete(x)) != 0) {
713 xfrm_audit_state_delete(x, 0, task_valid);
714 return err;
715 }
716 }
717 }
718
719 return err;
720 }
721
722 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)723 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
724 {
725 int i, err = 0;
726
727 for (i = 0; i <= net->xfrm.state_hmask; i++) {
728 struct xfrm_state *x;
729 struct xfrm_state_offload *xso;
730
731 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
732 xso = &x->xso;
733
734 if (xso->dev == dev &&
735 (err = security_xfrm_state_delete(x)) != 0) {
736 xfrm_audit_state_delete(x, 0, task_valid);
737 return err;
738 }
739 }
740 }
741
742 return err;
743 }
744 #else
745 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)746 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
747 {
748 return 0;
749 }
750
751 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)752 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
753 {
754 return 0;
755 }
756 #endif
757
xfrm_state_flush(struct net * net,u8 proto,bool task_valid,bool sync)758 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
759 {
760 int i, err = 0, cnt = 0;
761
762 spin_lock_bh(&net->xfrm.xfrm_state_lock);
763 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
764 if (err)
765 goto out;
766
767 err = -ESRCH;
768 for (i = 0; i <= net->xfrm.state_hmask; i++) {
769 struct xfrm_state *x;
770 restart:
771 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
772 if (!xfrm_state_kern(x) &&
773 xfrm_id_proto_match(x->id.proto, proto)) {
774 xfrm_state_hold(x);
775 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
776
777 err = xfrm_state_delete(x);
778 xfrm_audit_state_delete(x, err ? 0 : 1,
779 task_valid);
780 if (sync)
781 xfrm_state_put_sync(x);
782 else
783 xfrm_state_put(x);
784 if (!err)
785 cnt++;
786
787 spin_lock_bh(&net->xfrm.xfrm_state_lock);
788 goto restart;
789 }
790 }
791 }
792 out:
793 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
794 if (cnt)
795 err = 0;
796
797 return err;
798 }
799 EXPORT_SYMBOL(xfrm_state_flush);
800
xfrm_dev_state_flush(struct net * net,struct net_device * dev,bool task_valid)801 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
802 {
803 int i, err = 0, cnt = 0;
804
805 spin_lock_bh(&net->xfrm.xfrm_state_lock);
806 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
807 if (err)
808 goto out;
809
810 err = -ESRCH;
811 for (i = 0; i <= net->xfrm.state_hmask; i++) {
812 struct xfrm_state *x;
813 struct xfrm_state_offload *xso;
814 restart:
815 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
816 xso = &x->xso;
817
818 if (!xfrm_state_kern(x) && xso->dev == dev) {
819 xfrm_state_hold(x);
820 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
821
822 err = xfrm_state_delete(x);
823 xfrm_audit_state_delete(x, err ? 0 : 1,
824 task_valid);
825 xfrm_state_put(x);
826 if (!err)
827 cnt++;
828
829 spin_lock_bh(&net->xfrm.xfrm_state_lock);
830 goto restart;
831 }
832 }
833 }
834 if (cnt)
835 err = 0;
836
837 out:
838 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
839 return err;
840 }
841 EXPORT_SYMBOL(xfrm_dev_state_flush);
842
xfrm_sad_getinfo(struct net * net,struct xfrmk_sadinfo * si)843 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
844 {
845 spin_lock_bh(&net->xfrm.xfrm_state_lock);
846 si->sadcnt = net->xfrm.state_num;
847 si->sadhcnt = net->xfrm.state_hmask + 1;
848 si->sadhmcnt = xfrm_state_hashmax;
849 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
850 }
851 EXPORT_SYMBOL(xfrm_sad_getinfo);
852
853 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)854 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
855 {
856 const struct flowi4 *fl4 = &fl->u.ip4;
857
858 sel->daddr.a4 = fl4->daddr;
859 sel->saddr.a4 = fl4->saddr;
860 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
861 sel->dport_mask = htons(0xffff);
862 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
863 sel->sport_mask = htons(0xffff);
864 sel->family = AF_INET;
865 sel->prefixlen_d = 32;
866 sel->prefixlen_s = 32;
867 sel->proto = fl4->flowi4_proto;
868 sel->ifindex = fl4->flowi4_oif;
869 }
870
871 static void
__xfrm6_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)872 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
873 {
874 const struct flowi6 *fl6 = &fl->u.ip6;
875
876 /* Initialize temporary selector matching only to current session. */
877 *(struct in6_addr *)&sel->daddr = fl6->daddr;
878 *(struct in6_addr *)&sel->saddr = fl6->saddr;
879 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
880 sel->dport_mask = htons(0xffff);
881 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
882 sel->sport_mask = htons(0xffff);
883 sel->family = AF_INET6;
884 sel->prefixlen_d = 128;
885 sel->prefixlen_s = 128;
886 sel->proto = fl6->flowi6_proto;
887 sel->ifindex = fl6->flowi6_oif;
888 }
889
890 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)891 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
892 const struct xfrm_tmpl *tmpl,
893 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
894 unsigned short family)
895 {
896 switch (family) {
897 case AF_INET:
898 __xfrm4_init_tempsel(&x->sel, fl);
899 break;
900 case AF_INET6:
901 __xfrm6_init_tempsel(&x->sel, fl);
902 break;
903 }
904
905 x->id = tmpl->id;
906
907 switch (tmpl->encap_family) {
908 case AF_INET:
909 if (x->id.daddr.a4 == 0)
910 x->id.daddr.a4 = daddr->a4;
911 x->props.saddr = tmpl->saddr;
912 if (x->props.saddr.a4 == 0)
913 x->props.saddr.a4 = saddr->a4;
914 break;
915 case AF_INET6:
916 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
917 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
918 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
919 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
920 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
921 break;
922 }
923
924 x->props.mode = tmpl->mode;
925 x->props.reqid = tmpl->reqid;
926 x->props.family = tmpl->encap_family;
927 }
928
__xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)929 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
930 const xfrm_address_t *daddr,
931 __be32 spi, u8 proto,
932 unsigned short family)
933 {
934 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
935 struct xfrm_state *x;
936
937 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
938 if (x->props.family != family ||
939 x->id.spi != spi ||
940 x->id.proto != proto ||
941 !xfrm_addr_equal(&x->id.daddr, daddr, family))
942 continue;
943
944 if ((mark & x->mark.m) != x->mark.v)
945 continue;
946 if (!xfrm_state_hold_rcu(x))
947 continue;
948 return x;
949 }
950
951 return NULL;
952 }
953
__xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)954 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
955 const xfrm_address_t *daddr,
956 const xfrm_address_t *saddr,
957 u8 proto, unsigned short family)
958 {
959 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
960 struct xfrm_state *x;
961
962 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
963 if (x->props.family != family ||
964 x->id.proto != proto ||
965 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
966 !xfrm_addr_equal(&x->props.saddr, saddr, family))
967 continue;
968
969 if ((mark & x->mark.m) != x->mark.v)
970 continue;
971 if (!xfrm_state_hold_rcu(x))
972 continue;
973 return x;
974 }
975
976 return NULL;
977 }
978
979 static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state * x,int use_spi,int family)980 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
981 {
982 struct net *net = xs_net(x);
983 u32 mark = x->mark.v & x->mark.m;
984
985 if (use_spi)
986 return __xfrm_state_lookup(net, mark, &x->id.daddr,
987 x->id.spi, x->id.proto, family);
988 else
989 return __xfrm_state_lookup_byaddr(net, mark,
990 &x->id.daddr,
991 &x->props.saddr,
992 x->id.proto, family);
993 }
994
xfrm_hash_grow_check(struct net * net,int have_hash_collision)995 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
996 {
997 if (have_hash_collision &&
998 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
999 net->xfrm.state_num > net->xfrm.state_hmask)
1000 schedule_work(&net->xfrm.state_hash_work);
1001 }
1002
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)1003 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1004 const struct flowi *fl, unsigned short family,
1005 struct xfrm_state **best, int *acq_in_progress,
1006 int *error)
1007 {
1008 /* Resolution logic:
1009 * 1. There is a valid state with matching selector. Done.
1010 * 2. Valid state with inappropriate selector. Skip.
1011 *
1012 * Entering area of "sysdeps".
1013 *
1014 * 3. If state is not valid, selector is temporary, it selects
1015 * only session which triggered previous resolution. Key
1016 * manager will do something to install a state with proper
1017 * selector.
1018 */
1019 if (x->km.state == XFRM_STATE_VALID) {
1020 if ((x->sel.family &&
1021 (x->sel.family != family ||
1022 !xfrm_selector_match(&x->sel, fl, family))) ||
1023 !security_xfrm_state_pol_flow_match(x, pol,
1024 &fl->u.__fl_common))
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,
1040 &fl->u.__fl_common))
1041 *error = -ESRCH;
1042 }
1043 }
1044
1045 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)1046 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1047 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1048 struct xfrm_policy *pol, int *err,
1049 unsigned short family, u32 if_id)
1050 {
1051 static xfrm_address_t saddr_wildcard = { };
1052 struct net *net = xp_net(pol);
1053 unsigned int h, h_wildcard;
1054 struct xfrm_state *x, *x0, *to_put;
1055 int acquire_in_progress = 0;
1056 int error = 0;
1057 struct xfrm_state *best = NULL;
1058 u32 mark = pol->mark.v & pol->mark.m;
1059 unsigned short encap_family = tmpl->encap_family;
1060 unsigned int sequence;
1061 struct km_event c;
1062
1063 to_put = NULL;
1064
1065 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1066
1067 rcu_read_lock();
1068 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1069 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1070 if (x->props.family == encap_family &&
1071 x->props.reqid == tmpl->reqid &&
1072 (mark & x->mark.m) == x->mark.v &&
1073 x->if_id == if_id &&
1074 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1075 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1076 tmpl->mode == x->props.mode &&
1077 tmpl->id.proto == x->id.proto &&
1078 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1079 xfrm_state_look_at(pol, x, fl, family,
1080 &best, &acquire_in_progress, &error);
1081 }
1082 if (best || acquire_in_progress)
1083 goto found;
1084
1085 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1086 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1087 if (x->props.family == encap_family &&
1088 x->props.reqid == tmpl->reqid &&
1089 (mark & x->mark.m) == x->mark.v &&
1090 x->if_id == if_id &&
1091 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1092 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1093 tmpl->mode == x->props.mode &&
1094 tmpl->id.proto == x->id.proto &&
1095 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1096 xfrm_state_look_at(pol, x, fl, family,
1097 &best, &acquire_in_progress, &error);
1098 }
1099
1100 found:
1101 x = best;
1102 if (!x && !error && !acquire_in_progress) {
1103 if (tmpl->id.spi &&
1104 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1105 tmpl->id.proto, encap_family)) != NULL) {
1106 to_put = x0;
1107 error = -EEXIST;
1108 goto out;
1109 }
1110
1111 c.net = net;
1112 /* If the KMs have no listeners (yet...), avoid allocating an SA
1113 * for each and every packet - garbage collection might not
1114 * handle the flood.
1115 */
1116 if (!km_is_alive(&c)) {
1117 error = -ESRCH;
1118 goto out;
1119 }
1120
1121 x = xfrm_state_alloc(net);
1122 if (x == NULL) {
1123 error = -ENOMEM;
1124 goto out;
1125 }
1126 /* Initialize temporary state matching only
1127 * to current session. */
1128 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1129 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1130 x->if_id = if_id;
1131
1132 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1133 if (error) {
1134 x->km.state = XFRM_STATE_DEAD;
1135 to_put = x;
1136 x = NULL;
1137 goto out;
1138 }
1139
1140 if (km_query(x, tmpl, pol) == 0) {
1141 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1142 x->km.state = XFRM_STATE_ACQ;
1143 list_add(&x->km.all, &net->xfrm.state_all);
1144 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1145 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1146 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1147 if (x->id.spi) {
1148 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1149 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1150 }
1151 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1152 hrtimer_start(&x->mtimer,
1153 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1154 HRTIMER_MODE_REL_SOFT);
1155 net->xfrm.state_num++;
1156 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1157 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1158 } else {
1159 x->km.state = XFRM_STATE_DEAD;
1160 to_put = x;
1161 x = NULL;
1162 error = -ESRCH;
1163 }
1164 }
1165 out:
1166 if (x) {
1167 if (!xfrm_state_hold_rcu(x)) {
1168 *err = -EAGAIN;
1169 x = NULL;
1170 }
1171 } else {
1172 *err = acquire_in_progress ? -EAGAIN : error;
1173 }
1174 rcu_read_unlock();
1175 if (to_put)
1176 xfrm_state_put(to_put);
1177
1178 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1179 *err = -EAGAIN;
1180 if (x) {
1181 xfrm_state_put(x);
1182 x = NULL;
1183 }
1184 }
1185
1186 return x;
1187 }
1188
1189 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)1190 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1191 xfrm_address_t *daddr, xfrm_address_t *saddr,
1192 unsigned short family, u8 mode, u8 proto, u32 reqid)
1193 {
1194 unsigned int h;
1195 struct xfrm_state *rx = NULL, *x = NULL;
1196
1197 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1198 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1199 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1200 if (x->props.family == family &&
1201 x->props.reqid == reqid &&
1202 (mark & x->mark.m) == x->mark.v &&
1203 x->if_id == if_id &&
1204 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1205 xfrm_state_addr_check(x, daddr, saddr, family) &&
1206 mode == x->props.mode &&
1207 proto == x->id.proto &&
1208 x->km.state == XFRM_STATE_VALID) {
1209 rx = x;
1210 break;
1211 }
1212 }
1213
1214 if (rx)
1215 xfrm_state_hold(rx);
1216 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1217
1218
1219 return rx;
1220 }
1221 EXPORT_SYMBOL(xfrm_stateonly_find);
1222
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1223 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1224 unsigned short family)
1225 {
1226 struct xfrm_state *x;
1227 struct xfrm_state_walk *w;
1228
1229 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1230 list_for_each_entry(w, &net->xfrm.state_all, all) {
1231 x = container_of(w, struct xfrm_state, km);
1232 if (x->props.family != family ||
1233 x->id.spi != spi)
1234 continue;
1235
1236 xfrm_state_hold(x);
1237 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1238 return x;
1239 }
1240 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1241 return NULL;
1242 }
1243 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1244
__xfrm_state_insert(struct xfrm_state * x)1245 static void __xfrm_state_insert(struct xfrm_state *x)
1246 {
1247 struct net *net = xs_net(x);
1248 unsigned int h;
1249
1250 list_add(&x->km.all, &net->xfrm.state_all);
1251
1252 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1253 x->props.reqid, x->props.family);
1254 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1255
1256 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1257 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1258
1259 if (x->id.spi) {
1260 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1261 x->props.family);
1262
1263 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1264 }
1265
1266 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1267 if (x->replay_maxage)
1268 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1269
1270 net->xfrm.state_num++;
1271
1272 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1273 }
1274
1275 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1276 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1277 {
1278 struct net *net = xs_net(xnew);
1279 unsigned short family = xnew->props.family;
1280 u32 reqid = xnew->props.reqid;
1281 struct xfrm_state *x;
1282 unsigned int h;
1283 u32 mark = xnew->mark.v & xnew->mark.m;
1284 u32 if_id = xnew->if_id;
1285
1286 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1287 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1288 if (x->props.family == family &&
1289 x->props.reqid == reqid &&
1290 x->if_id == if_id &&
1291 (mark & x->mark.m) == x->mark.v &&
1292 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1293 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1294 x->genid++;
1295 }
1296 }
1297
xfrm_state_insert(struct xfrm_state * x)1298 void xfrm_state_insert(struct xfrm_state *x)
1299 {
1300 struct net *net = xs_net(x);
1301
1302 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1303 __xfrm_state_bump_genids(x);
1304 __xfrm_state_insert(x);
1305 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1306 }
1307 EXPORT_SYMBOL(xfrm_state_insert);
1308
1309 /* 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)1310 static struct xfrm_state *__find_acq_core(struct net *net,
1311 const struct xfrm_mark *m,
1312 unsigned short family, u8 mode,
1313 u32 reqid, u32 if_id, u8 proto,
1314 const xfrm_address_t *daddr,
1315 const xfrm_address_t *saddr,
1316 int create)
1317 {
1318 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1319 struct xfrm_state *x;
1320 u32 mark = m->v & m->m;
1321
1322 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1323 if (x->props.reqid != reqid ||
1324 x->props.mode != mode ||
1325 x->props.family != family ||
1326 x->km.state != XFRM_STATE_ACQ ||
1327 x->id.spi != 0 ||
1328 x->id.proto != proto ||
1329 (mark & x->mark.m) != x->mark.v ||
1330 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1331 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1332 continue;
1333
1334 xfrm_state_hold(x);
1335 return x;
1336 }
1337
1338 if (!create)
1339 return NULL;
1340
1341 x = xfrm_state_alloc(net);
1342 if (likely(x)) {
1343 switch (family) {
1344 case AF_INET:
1345 x->sel.daddr.a4 = daddr->a4;
1346 x->sel.saddr.a4 = saddr->a4;
1347 x->sel.prefixlen_d = 32;
1348 x->sel.prefixlen_s = 32;
1349 x->props.saddr.a4 = saddr->a4;
1350 x->id.daddr.a4 = daddr->a4;
1351 break;
1352
1353 case AF_INET6:
1354 x->sel.daddr.in6 = daddr->in6;
1355 x->sel.saddr.in6 = saddr->in6;
1356 x->sel.prefixlen_d = 128;
1357 x->sel.prefixlen_s = 128;
1358 x->props.saddr.in6 = saddr->in6;
1359 x->id.daddr.in6 = daddr->in6;
1360 break;
1361 }
1362
1363 x->km.state = XFRM_STATE_ACQ;
1364 x->id.proto = proto;
1365 x->props.family = family;
1366 x->props.mode = mode;
1367 x->props.reqid = reqid;
1368 x->if_id = if_id;
1369 x->mark.v = m->v;
1370 x->mark.m = m->m;
1371 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1372 xfrm_state_hold(x);
1373 hrtimer_start(&x->mtimer,
1374 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1375 HRTIMER_MODE_REL_SOFT);
1376 list_add(&x->km.all, &net->xfrm.state_all);
1377 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1378 h = xfrm_src_hash(net, daddr, saddr, family);
1379 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1380
1381 net->xfrm.state_num++;
1382
1383 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1384 }
1385
1386 return x;
1387 }
1388
1389 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1390
xfrm_state_add(struct xfrm_state * x)1391 int xfrm_state_add(struct xfrm_state *x)
1392 {
1393 struct net *net = xs_net(x);
1394 struct xfrm_state *x1, *to_put;
1395 int family;
1396 int err;
1397 u32 mark = x->mark.v & x->mark.m;
1398 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1399
1400 family = x->props.family;
1401
1402 to_put = NULL;
1403
1404 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1405
1406 x1 = __xfrm_state_locate(x, use_spi, family);
1407 if (x1) {
1408 to_put = x1;
1409 x1 = NULL;
1410 err = -EEXIST;
1411 goto out;
1412 }
1413
1414 if (use_spi && x->km.seq) {
1415 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1416 if (x1 && ((x1->id.proto != x->id.proto) ||
1417 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1418 to_put = x1;
1419 x1 = NULL;
1420 }
1421 }
1422
1423 if (use_spi && !x1)
1424 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1425 x->props.reqid, x->if_id, x->id.proto,
1426 &x->id.daddr, &x->props.saddr, 0);
1427
1428 __xfrm_state_bump_genids(x);
1429 __xfrm_state_insert(x);
1430 err = 0;
1431
1432 out:
1433 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1434
1435 if (x1) {
1436 xfrm_state_delete(x1);
1437 xfrm_state_put(x1);
1438 }
1439
1440 if (to_put)
1441 xfrm_state_put(to_put);
1442
1443 return err;
1444 }
1445 EXPORT_SYMBOL(xfrm_state_add);
1446
1447 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1448 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1449 {
1450 struct xfrm_user_sec_ctx *uctx;
1451 int size = sizeof(*uctx) + security->ctx_len;
1452 int err;
1453
1454 uctx = kmalloc(size, GFP_KERNEL);
1455 if (!uctx)
1456 return -ENOMEM;
1457
1458 uctx->exttype = XFRMA_SEC_CTX;
1459 uctx->len = size;
1460 uctx->ctx_doi = security->ctx_doi;
1461 uctx->ctx_alg = security->ctx_alg;
1462 uctx->ctx_len = security->ctx_len;
1463 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1464 err = security_xfrm_state_alloc(x, uctx);
1465 kfree(uctx);
1466 if (err)
1467 return err;
1468
1469 return 0;
1470 }
1471
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1472 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1473 struct xfrm_encap_tmpl *encap)
1474 {
1475 struct net *net = xs_net(orig);
1476 struct xfrm_state *x = xfrm_state_alloc(net);
1477 if (!x)
1478 goto out;
1479
1480 memcpy(&x->id, &orig->id, sizeof(x->id));
1481 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1482 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1483 x->props.mode = orig->props.mode;
1484 x->props.replay_window = orig->props.replay_window;
1485 x->props.reqid = orig->props.reqid;
1486 x->props.family = orig->props.family;
1487 x->props.saddr = orig->props.saddr;
1488
1489 if (orig->aalg) {
1490 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1491 if (!x->aalg)
1492 goto error;
1493 }
1494 x->props.aalgo = orig->props.aalgo;
1495
1496 if (orig->aead) {
1497 x->aead = xfrm_algo_aead_clone(orig->aead);
1498 x->geniv = orig->geniv;
1499 if (!x->aead)
1500 goto error;
1501 }
1502 if (orig->ealg) {
1503 x->ealg = xfrm_algo_clone(orig->ealg);
1504 if (!x->ealg)
1505 goto error;
1506 }
1507 x->props.ealgo = orig->props.ealgo;
1508
1509 if (orig->calg) {
1510 x->calg = xfrm_algo_clone(orig->calg);
1511 if (!x->calg)
1512 goto error;
1513 }
1514 x->props.calgo = orig->props.calgo;
1515
1516 if (encap || orig->encap) {
1517 if (encap)
1518 x->encap = kmemdup(encap, sizeof(*x->encap),
1519 GFP_KERNEL);
1520 else
1521 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1522 GFP_KERNEL);
1523
1524 if (!x->encap)
1525 goto error;
1526 }
1527
1528 if (orig->security)
1529 if (clone_security(x, orig->security))
1530 goto error;
1531
1532 if (orig->coaddr) {
1533 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1534 GFP_KERNEL);
1535 if (!x->coaddr)
1536 goto error;
1537 }
1538
1539 if (orig->replay_esn) {
1540 if (xfrm_replay_clone(x, orig))
1541 goto error;
1542 }
1543
1544 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1545 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1546
1547 x->props.flags = orig->props.flags;
1548 x->props.extra_flags = orig->props.extra_flags;
1549
1550 x->if_id = orig->if_id;
1551 x->tfcpad = orig->tfcpad;
1552 x->replay_maxdiff = orig->replay_maxdiff;
1553 x->replay_maxage = orig->replay_maxage;
1554 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1555 x->km.state = orig->km.state;
1556 x->km.seq = orig->km.seq;
1557 x->replay = orig->replay;
1558 x->preplay = orig->preplay;
1559 x->lastused = orig->lastused;
1560
1561 return x;
1562
1563 error:
1564 xfrm_state_put(x);
1565 out:
1566 return NULL;
1567 }
1568
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1569 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1570 u32 if_id)
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 (if_id != 0 && x->if_id != if_id)
1587 continue;
1588 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1589 m->old_family) ||
1590 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1591 m->old_family))
1592 continue;
1593 xfrm_state_hold(x);
1594 break;
1595 }
1596 } else {
1597 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1598 m->old_family);
1599 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1600 if (x->props.mode != m->mode ||
1601 x->id.proto != m->proto)
1602 continue;
1603 if (if_id != 0 && x->if_id != if_id)
1604 continue;
1605 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1606 m->old_family) ||
1607 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1608 m->old_family))
1609 continue;
1610 xfrm_state_hold(x);
1611 break;
1612 }
1613 }
1614
1615 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1616
1617 return x;
1618 }
1619 EXPORT_SYMBOL(xfrm_migrate_state_find);
1620
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1621 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1622 struct xfrm_migrate *m,
1623 struct xfrm_encap_tmpl *encap)
1624 {
1625 struct xfrm_state *xc;
1626
1627 xc = xfrm_state_clone(x, encap);
1628 if (!xc)
1629 return NULL;
1630
1631 xc->props.family = m->new_family;
1632
1633 if (xfrm_init_state(xc) < 0)
1634 goto error;
1635
1636 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1637 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1638
1639 /* add state */
1640 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1641 /* a care is needed when the destination address of the
1642 state is to be updated as it is a part of triplet */
1643 xfrm_state_insert(xc);
1644 } else {
1645 if (xfrm_state_add(xc) < 0)
1646 goto error;
1647 }
1648
1649 return xc;
1650 error:
1651 xfrm_state_put(xc);
1652 return NULL;
1653 }
1654 EXPORT_SYMBOL(xfrm_state_migrate);
1655 #endif
1656
xfrm_state_update(struct xfrm_state * x)1657 int xfrm_state_update(struct xfrm_state *x)
1658 {
1659 struct xfrm_state *x1, *to_put;
1660 int err;
1661 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1662 struct net *net = xs_net(x);
1663
1664 to_put = NULL;
1665
1666 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1667 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1668
1669 err = -ESRCH;
1670 if (!x1)
1671 goto out;
1672
1673 if (xfrm_state_kern(x1)) {
1674 to_put = x1;
1675 err = -EEXIST;
1676 goto out;
1677 }
1678
1679 if (x1->km.state == XFRM_STATE_ACQ) {
1680 __xfrm_state_insert(x);
1681 x = NULL;
1682 }
1683 err = 0;
1684
1685 out:
1686 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1687
1688 if (to_put)
1689 xfrm_state_put(to_put);
1690
1691 if (err)
1692 return err;
1693
1694 if (!x) {
1695 xfrm_state_delete(x1);
1696 xfrm_state_put(x1);
1697 return 0;
1698 }
1699
1700 err = -EINVAL;
1701 spin_lock_bh(&x1->lock);
1702 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1703 if (x->encap && x1->encap &&
1704 x->encap->encap_type == x1->encap->encap_type)
1705 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1706 else if (x->encap || x1->encap)
1707 goto fail;
1708
1709 if (x->coaddr && x1->coaddr) {
1710 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1711 }
1712 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1713 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1714 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1715 x1->km.dying = 0;
1716
1717 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1718 HRTIMER_MODE_REL_SOFT);
1719 if (x1->curlft.use_time)
1720 xfrm_state_check_expire(x1);
1721
1722 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1723 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1724
1725 if (x->props.smark.m || x->props.smark.v)
1726 x1->props.smark = x->props.smark;
1727
1728 if (x->if_id)
1729 x1->if_id = x->if_id;
1730
1731 __xfrm_state_bump_genids(x1);
1732 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1733 }
1734
1735 err = 0;
1736 x->km.state = XFRM_STATE_DEAD;
1737 __xfrm_state_put(x);
1738 }
1739
1740 fail:
1741 spin_unlock_bh(&x1->lock);
1742
1743 xfrm_state_put(x1);
1744
1745 return err;
1746 }
1747 EXPORT_SYMBOL(xfrm_state_update);
1748
xfrm_state_check_expire(struct xfrm_state * x)1749 int xfrm_state_check_expire(struct xfrm_state *x)
1750 {
1751 if (!x->curlft.use_time)
1752 x->curlft.use_time = ktime_get_real_seconds();
1753
1754 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1755 x->curlft.packets >= x->lft.hard_packet_limit) {
1756 x->km.state = XFRM_STATE_EXPIRED;
1757 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1758 return -EINVAL;
1759 }
1760
1761 if (!x->km.dying &&
1762 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1763 x->curlft.packets >= x->lft.soft_packet_limit)) {
1764 x->km.dying = 1;
1765 km_state_expired(x, 0, 0);
1766 }
1767 return 0;
1768 }
1769 EXPORT_SYMBOL(xfrm_state_check_expire);
1770
1771 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1772 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1773 u8 proto, unsigned short family)
1774 {
1775 struct xfrm_state *x;
1776
1777 rcu_read_lock();
1778 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1779 rcu_read_unlock();
1780 return x;
1781 }
1782 EXPORT_SYMBOL(xfrm_state_lookup);
1783
1784 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)1785 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1786 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1787 u8 proto, unsigned short family)
1788 {
1789 struct xfrm_state *x;
1790
1791 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1792 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1793 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1794 return x;
1795 }
1796 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1797
1798 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)1799 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1800 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1801 const xfrm_address_t *saddr, int create, unsigned short family)
1802 {
1803 struct xfrm_state *x;
1804
1805 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1806 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1807 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1808
1809 return x;
1810 }
1811 EXPORT_SYMBOL(xfrm_find_acq);
1812
1813 #ifdef CONFIG_XFRM_SUB_POLICY
1814 #if IS_ENABLED(CONFIG_IPV6)
1815 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1816 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1817 __xfrm6_sort(void **dst, void **src, int n,
1818 int (*cmp)(const void *p), int maxclass)
1819 {
1820 int count[XFRM_MAX_DEPTH] = { };
1821 int class[XFRM_MAX_DEPTH];
1822 int i;
1823
1824 for (i = 0; i < n; i++) {
1825 int c = cmp(src[i]);
1826
1827 class[i] = c;
1828 count[c]++;
1829 }
1830
1831 for (i = 2; i < maxclass; i++)
1832 count[i] += count[i - 1];
1833
1834 for (i = 0; i < n; i++) {
1835 dst[count[class[i] - 1]++] = src[i];
1836 src[i] = NULL;
1837 }
1838 }
1839
1840 /* Rule for xfrm_state:
1841 *
1842 * rule 1: select IPsec transport except AH
1843 * rule 2: select MIPv6 RO or inbound trigger
1844 * rule 3: select IPsec transport AH
1845 * rule 4: select IPsec tunnel
1846 * rule 5: others
1847 */
__xfrm6_state_sort_cmp(const void * p)1848 static int __xfrm6_state_sort_cmp(const void *p)
1849 {
1850 const struct xfrm_state *v = p;
1851
1852 switch (v->props.mode) {
1853 case XFRM_MODE_TRANSPORT:
1854 if (v->id.proto != IPPROTO_AH)
1855 return 1;
1856 else
1857 return 3;
1858 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1859 case XFRM_MODE_ROUTEOPTIMIZATION:
1860 case XFRM_MODE_IN_TRIGGER:
1861 return 2;
1862 #endif
1863 case XFRM_MODE_TUNNEL:
1864 case XFRM_MODE_BEET:
1865 return 4;
1866 }
1867 return 5;
1868 }
1869
1870 /* Rule for xfrm_tmpl:
1871 *
1872 * rule 1: select IPsec transport
1873 * rule 2: select MIPv6 RO or inbound trigger
1874 * rule 3: select IPsec tunnel
1875 * rule 4: others
1876 */
__xfrm6_tmpl_sort_cmp(const void * p)1877 static int __xfrm6_tmpl_sort_cmp(const void *p)
1878 {
1879 const struct xfrm_tmpl *v = p;
1880
1881 switch (v->mode) {
1882 case XFRM_MODE_TRANSPORT:
1883 return 1;
1884 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1885 case XFRM_MODE_ROUTEOPTIMIZATION:
1886 case XFRM_MODE_IN_TRIGGER:
1887 return 2;
1888 #endif
1889 case XFRM_MODE_TUNNEL:
1890 case XFRM_MODE_BEET:
1891 return 3;
1892 }
1893 return 4;
1894 }
1895 #else
__xfrm6_state_sort_cmp(const void * p)1896 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)1897 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1898
1899 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1900 __xfrm6_sort(void **dst, void **src, int n,
1901 int (*cmp)(const void *p), int maxclass)
1902 {
1903 int i;
1904
1905 for (i = 0; i < n; i++)
1906 dst[i] = src[i];
1907 }
1908 #endif /* CONFIG_IPV6 */
1909
1910 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)1911 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1912 unsigned short family)
1913 {
1914 int i;
1915
1916 if (family == AF_INET6)
1917 __xfrm6_sort((void **)dst, (void **)src, n,
1918 __xfrm6_tmpl_sort_cmp, 5);
1919 else
1920 for (i = 0; i < n; i++)
1921 dst[i] = src[i];
1922 }
1923
1924 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)1925 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1926 unsigned short family)
1927 {
1928 int i;
1929
1930 if (family == AF_INET6)
1931 __xfrm6_sort((void **)dst, (void **)src, n,
1932 __xfrm6_state_sort_cmp, 6);
1933 else
1934 for (i = 0; i < n; i++)
1935 dst[i] = src[i];
1936 }
1937 #endif
1938
1939 /* Silly enough, but I'm lazy to build resolution list */
1940
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1941 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1942 {
1943 int i;
1944
1945 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1946 struct xfrm_state *x;
1947
1948 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1949 if (x->km.seq == seq &&
1950 (mark & x->mark.m) == x->mark.v &&
1951 x->km.state == XFRM_STATE_ACQ) {
1952 xfrm_state_hold(x);
1953 return x;
1954 }
1955 }
1956 }
1957 return NULL;
1958 }
1959
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1960 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1961 {
1962 struct xfrm_state *x;
1963
1964 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1965 x = __xfrm_find_acq_byseq(net, mark, seq);
1966 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1967 return x;
1968 }
1969 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1970
xfrm_get_acqseq(void)1971 u32 xfrm_get_acqseq(void)
1972 {
1973 u32 res;
1974 static atomic_t acqseq;
1975
1976 do {
1977 res = atomic_inc_return(&acqseq);
1978 } while (!res);
1979
1980 return res;
1981 }
1982 EXPORT_SYMBOL(xfrm_get_acqseq);
1983
verify_spi_info(u8 proto,u32 min,u32 max)1984 int verify_spi_info(u8 proto, u32 min, u32 max)
1985 {
1986 switch (proto) {
1987 case IPPROTO_AH:
1988 case IPPROTO_ESP:
1989 break;
1990
1991 case IPPROTO_COMP:
1992 /* IPCOMP spi is 16-bits. */
1993 if (max >= 0x10000)
1994 return -EINVAL;
1995 break;
1996
1997 default:
1998 return -EINVAL;
1999 }
2000
2001 if (min > max)
2002 return -EINVAL;
2003
2004 return 0;
2005 }
2006 EXPORT_SYMBOL(verify_spi_info);
2007
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high)2008 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2009 {
2010 struct net *net = xs_net(x);
2011 unsigned int h;
2012 struct xfrm_state *x0;
2013 int err = -ENOENT;
2014 __be32 minspi = htonl(low);
2015 __be32 maxspi = htonl(high);
2016 __be32 newspi = 0;
2017 u32 mark = x->mark.v & x->mark.m;
2018
2019 spin_lock_bh(&x->lock);
2020 if (x->km.state == XFRM_STATE_DEAD)
2021 goto unlock;
2022
2023 err = 0;
2024 if (x->id.spi)
2025 goto unlock;
2026
2027 err = -ENOENT;
2028
2029 if (minspi == maxspi) {
2030 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2031 if (x0) {
2032 xfrm_state_put(x0);
2033 goto unlock;
2034 }
2035 newspi = minspi;
2036 } else {
2037 u32 spi = 0;
2038 for (h = 0; h < high-low+1; h++) {
2039 spi = low + prandom_u32()%(high-low+1);
2040 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2041 if (x0 == NULL) {
2042 newspi = htonl(spi);
2043 break;
2044 }
2045 xfrm_state_put(x0);
2046 }
2047 }
2048 if (newspi) {
2049 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2050 x->id.spi = newspi;
2051 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2052 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2053 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2054
2055 err = 0;
2056 }
2057
2058 unlock:
2059 spin_unlock_bh(&x->lock);
2060
2061 return err;
2062 }
2063 EXPORT_SYMBOL(xfrm_alloc_spi);
2064
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2065 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2066 struct xfrm_address_filter *filter)
2067 {
2068 if (filter) {
2069 if ((filter->family == AF_INET ||
2070 filter->family == AF_INET6) &&
2071 x->props.family != filter->family)
2072 return false;
2073
2074 return addr_match(&x->props.saddr, &filter->saddr,
2075 filter->splen) &&
2076 addr_match(&x->id.daddr, &filter->daddr,
2077 filter->dplen);
2078 }
2079 return true;
2080 }
2081
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2082 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2083 int (*func)(struct xfrm_state *, int, void*),
2084 void *data)
2085 {
2086 struct xfrm_state *state;
2087 struct xfrm_state_walk *x;
2088 int err = 0;
2089
2090 if (walk->seq != 0 && list_empty(&walk->all))
2091 return 0;
2092
2093 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2094 if (list_empty(&walk->all))
2095 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2096 else
2097 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2098 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2099 if (x->state == XFRM_STATE_DEAD)
2100 continue;
2101 state = container_of(x, struct xfrm_state, km);
2102 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2103 continue;
2104 if (!__xfrm_state_filter_match(state, walk->filter))
2105 continue;
2106 err = func(state, walk->seq, data);
2107 if (err) {
2108 list_move_tail(&walk->all, &x->all);
2109 goto out;
2110 }
2111 walk->seq++;
2112 }
2113 if (walk->seq == 0) {
2114 err = -ENOENT;
2115 goto out;
2116 }
2117 list_del_init(&walk->all);
2118 out:
2119 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2120 return err;
2121 }
2122 EXPORT_SYMBOL(xfrm_state_walk);
2123
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2124 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2125 struct xfrm_address_filter *filter)
2126 {
2127 INIT_LIST_HEAD(&walk->all);
2128 walk->proto = proto;
2129 walk->state = XFRM_STATE_DEAD;
2130 walk->seq = 0;
2131 walk->filter = filter;
2132 }
2133 EXPORT_SYMBOL(xfrm_state_walk_init);
2134
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2135 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2136 {
2137 kfree(walk->filter);
2138
2139 if (list_empty(&walk->all))
2140 return;
2141
2142 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2143 list_del(&walk->all);
2144 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2145 }
2146 EXPORT_SYMBOL(xfrm_state_walk_done);
2147
xfrm_replay_timer_handler(struct timer_list * t)2148 static void xfrm_replay_timer_handler(struct timer_list *t)
2149 {
2150 struct xfrm_state *x = from_timer(x, t, rtimer);
2151
2152 spin_lock(&x->lock);
2153
2154 if (x->km.state == XFRM_STATE_VALID) {
2155 if (xfrm_aevent_is_on(xs_net(x)))
2156 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2157 else
2158 x->xflags |= XFRM_TIME_DEFER;
2159 }
2160
2161 spin_unlock(&x->lock);
2162 }
2163
2164 static LIST_HEAD(xfrm_km_list);
2165
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2166 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2167 {
2168 struct xfrm_mgr *km;
2169
2170 rcu_read_lock();
2171 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2172 if (km->notify_policy)
2173 km->notify_policy(xp, dir, c);
2174 rcu_read_unlock();
2175 }
2176
km_state_notify(struct xfrm_state * x,const struct km_event * c)2177 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2178 {
2179 struct xfrm_mgr *km;
2180 rcu_read_lock();
2181 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2182 if (km->notify)
2183 km->notify(x, c);
2184 rcu_read_unlock();
2185 }
2186
2187 EXPORT_SYMBOL(km_policy_notify);
2188 EXPORT_SYMBOL(km_state_notify);
2189
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2190 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2191 {
2192 struct km_event c;
2193
2194 c.data.hard = hard;
2195 c.portid = portid;
2196 c.event = XFRM_MSG_EXPIRE;
2197 km_state_notify(x, &c);
2198 }
2199
2200 EXPORT_SYMBOL(km_state_expired);
2201 /*
2202 * We send to all registered managers regardless of failure
2203 * We are happy with one success
2204 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2205 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2206 {
2207 int err = -EINVAL, acqret;
2208 struct xfrm_mgr *km;
2209
2210 rcu_read_lock();
2211 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2212 acqret = km->acquire(x, t, pol);
2213 if (!acqret)
2214 err = acqret;
2215 }
2216 rcu_read_unlock();
2217 return err;
2218 }
2219 EXPORT_SYMBOL(km_query);
2220
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2221 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2222 {
2223 int err = -EINVAL;
2224 struct xfrm_mgr *km;
2225
2226 rcu_read_lock();
2227 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2228 if (km->new_mapping)
2229 err = km->new_mapping(x, ipaddr, sport);
2230 if (!err)
2231 break;
2232 }
2233 rcu_read_unlock();
2234 return err;
2235 }
2236 EXPORT_SYMBOL(km_new_mapping);
2237
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2238 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2239 {
2240 struct km_event c;
2241
2242 c.data.hard = hard;
2243 c.portid = portid;
2244 c.event = XFRM_MSG_POLEXPIRE;
2245 km_policy_notify(pol, dir, &c);
2246 }
2247 EXPORT_SYMBOL(km_policy_expired);
2248
2249 #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)2250 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2251 const struct xfrm_migrate *m, int num_migrate,
2252 const struct xfrm_kmaddress *k,
2253 const struct xfrm_encap_tmpl *encap)
2254 {
2255 int err = -EINVAL;
2256 int ret;
2257 struct xfrm_mgr *km;
2258
2259 rcu_read_lock();
2260 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2261 if (km->migrate) {
2262 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2263 encap);
2264 if (!ret)
2265 err = ret;
2266 }
2267 }
2268 rcu_read_unlock();
2269 return err;
2270 }
2271 EXPORT_SYMBOL(km_migrate);
2272 #endif
2273
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2274 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2275 {
2276 int err = -EINVAL;
2277 int ret;
2278 struct xfrm_mgr *km;
2279
2280 rcu_read_lock();
2281 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2282 if (km->report) {
2283 ret = km->report(net, proto, sel, addr);
2284 if (!ret)
2285 err = ret;
2286 }
2287 }
2288 rcu_read_unlock();
2289 return err;
2290 }
2291 EXPORT_SYMBOL(km_report);
2292
km_is_alive(const struct km_event * c)2293 static bool km_is_alive(const struct km_event *c)
2294 {
2295 struct xfrm_mgr *km;
2296 bool is_alive = false;
2297
2298 rcu_read_lock();
2299 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2300 if (km->is_alive && km->is_alive(c)) {
2301 is_alive = true;
2302 break;
2303 }
2304 }
2305 rcu_read_unlock();
2306
2307 return is_alive;
2308 }
2309
2310 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2311 static DEFINE_SPINLOCK(xfrm_translator_lock);
2312 static struct xfrm_translator __rcu *xfrm_translator;
2313
xfrm_get_translator(void)2314 struct xfrm_translator *xfrm_get_translator(void)
2315 {
2316 struct xfrm_translator *xtr;
2317
2318 rcu_read_lock();
2319 xtr = rcu_dereference(xfrm_translator);
2320 if (unlikely(!xtr))
2321 goto out;
2322 if (!try_module_get(xtr->owner))
2323 xtr = NULL;
2324 out:
2325 rcu_read_unlock();
2326 return xtr;
2327 }
2328 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2329
xfrm_put_translator(struct xfrm_translator * xtr)2330 void xfrm_put_translator(struct xfrm_translator *xtr)
2331 {
2332 module_put(xtr->owner);
2333 }
2334 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2335
xfrm_register_translator(struct xfrm_translator * xtr)2336 int xfrm_register_translator(struct xfrm_translator *xtr)
2337 {
2338 int err = 0;
2339
2340 spin_lock_bh(&xfrm_translator_lock);
2341 if (unlikely(xfrm_translator != NULL))
2342 err = -EEXIST;
2343 else
2344 rcu_assign_pointer(xfrm_translator, xtr);
2345 spin_unlock_bh(&xfrm_translator_lock);
2346
2347 return err;
2348 }
2349 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2350
xfrm_unregister_translator(struct xfrm_translator * xtr)2351 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2352 {
2353 int err = 0;
2354
2355 spin_lock_bh(&xfrm_translator_lock);
2356 if (likely(xfrm_translator != NULL)) {
2357 if (rcu_access_pointer(xfrm_translator) != xtr)
2358 err = -EINVAL;
2359 else
2360 RCU_INIT_POINTER(xfrm_translator, NULL);
2361 }
2362 spin_unlock_bh(&xfrm_translator_lock);
2363 synchronize_rcu();
2364
2365 return err;
2366 }
2367 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2368 #endif
2369
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2370 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2371 {
2372 int err;
2373 u8 *data;
2374 struct xfrm_mgr *km;
2375 struct xfrm_policy *pol = NULL;
2376
2377 if (sockptr_is_null(optval) && !optlen) {
2378 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2379 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2380 __sk_dst_reset(sk);
2381 return 0;
2382 }
2383
2384 if (optlen <= 0 || optlen > PAGE_SIZE)
2385 return -EMSGSIZE;
2386
2387 data = memdup_sockptr(optval, optlen);
2388 if (IS_ERR(data))
2389 return PTR_ERR(data);
2390
2391 /* Use the 64-bit / untranslated format on Android, even for compat */
2392 if (!IS_ENABLED(CONFIG_ANDROID) || IS_ENABLED(CONFIG_XFRM_USER_COMPAT)) {
2393 if (in_compat_syscall()) {
2394 struct xfrm_translator *xtr = xfrm_get_translator();
2395
2396 if (!xtr) {
2397 kfree(data);
2398 return -EOPNOTSUPP;
2399 }
2400
2401 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2402 xfrm_put_translator(xtr);
2403 if (err) {
2404 kfree(data);
2405 return err;
2406 }
2407 }
2408 }
2409
2410 err = -EINVAL;
2411 rcu_read_lock();
2412 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2413 pol = km->compile_policy(sk, optname, data,
2414 optlen, &err);
2415 if (err >= 0)
2416 break;
2417 }
2418 rcu_read_unlock();
2419
2420 if (err >= 0) {
2421 xfrm_sk_policy_insert(sk, err, pol);
2422 xfrm_pol_put(pol);
2423 __sk_dst_reset(sk);
2424 err = 0;
2425 }
2426
2427 kfree(data);
2428 return err;
2429 }
2430 EXPORT_SYMBOL(xfrm_user_policy);
2431
2432 static DEFINE_SPINLOCK(xfrm_km_lock);
2433
xfrm_register_km(struct xfrm_mgr * km)2434 int xfrm_register_km(struct xfrm_mgr *km)
2435 {
2436 spin_lock_bh(&xfrm_km_lock);
2437 list_add_tail_rcu(&km->list, &xfrm_km_list);
2438 spin_unlock_bh(&xfrm_km_lock);
2439 return 0;
2440 }
2441 EXPORT_SYMBOL(xfrm_register_km);
2442
xfrm_unregister_km(struct xfrm_mgr * km)2443 int xfrm_unregister_km(struct xfrm_mgr *km)
2444 {
2445 spin_lock_bh(&xfrm_km_lock);
2446 list_del_rcu(&km->list);
2447 spin_unlock_bh(&xfrm_km_lock);
2448 synchronize_rcu();
2449 return 0;
2450 }
2451 EXPORT_SYMBOL(xfrm_unregister_km);
2452
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2453 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2454 {
2455 int err = 0;
2456
2457 if (WARN_ON(afinfo->family >= NPROTO))
2458 return -EAFNOSUPPORT;
2459
2460 spin_lock_bh(&xfrm_state_afinfo_lock);
2461 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2462 err = -EEXIST;
2463 else
2464 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2465 spin_unlock_bh(&xfrm_state_afinfo_lock);
2466 return err;
2467 }
2468 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2469
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2470 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2471 {
2472 int err = 0, family = afinfo->family;
2473
2474 if (WARN_ON(family >= NPROTO))
2475 return -EAFNOSUPPORT;
2476
2477 spin_lock_bh(&xfrm_state_afinfo_lock);
2478 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2479 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2480 err = -EINVAL;
2481 else
2482 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2483 }
2484 spin_unlock_bh(&xfrm_state_afinfo_lock);
2485 synchronize_rcu();
2486 return err;
2487 }
2488 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2489
xfrm_state_afinfo_get_rcu(unsigned int family)2490 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2491 {
2492 if (unlikely(family >= NPROTO))
2493 return NULL;
2494
2495 return rcu_dereference(xfrm_state_afinfo[family]);
2496 }
2497 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2498
xfrm_state_get_afinfo(unsigned int family)2499 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2500 {
2501 struct xfrm_state_afinfo *afinfo;
2502 if (unlikely(family >= NPROTO))
2503 return NULL;
2504 rcu_read_lock();
2505 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2506 if (unlikely(!afinfo))
2507 rcu_read_unlock();
2508 return afinfo;
2509 }
2510
xfrm_flush_gc(void)2511 void xfrm_flush_gc(void)
2512 {
2513 flush_work(&xfrm_state_gc_work);
2514 }
2515 EXPORT_SYMBOL(xfrm_flush_gc);
2516
2517 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2518 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2519 {
2520 if (x->tunnel) {
2521 struct xfrm_state *t = x->tunnel;
2522
2523 if (atomic_read(&t->tunnel_users) == 2)
2524 xfrm_state_delete(t);
2525 atomic_dec(&t->tunnel_users);
2526 xfrm_state_put_sync(t);
2527 x->tunnel = NULL;
2528 }
2529 }
2530 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2531
xfrm_state_mtu(struct xfrm_state * x,int mtu)2532 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2533 {
2534 const struct xfrm_type *type = READ_ONCE(x->type);
2535 struct crypto_aead *aead;
2536 u32 blksize, net_adj = 0;
2537
2538 if (x->km.state != XFRM_STATE_VALID ||
2539 !type || type->proto != IPPROTO_ESP)
2540 return mtu - x->props.header_len;
2541
2542 aead = x->data;
2543 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2544
2545 switch (x->props.mode) {
2546 case XFRM_MODE_TRANSPORT:
2547 case XFRM_MODE_BEET:
2548 if (x->props.family == AF_INET)
2549 net_adj = sizeof(struct iphdr);
2550 else if (x->props.family == AF_INET6)
2551 net_adj = sizeof(struct ipv6hdr);
2552 break;
2553 case XFRM_MODE_TUNNEL:
2554 break;
2555 default:
2556 WARN_ON_ONCE(1);
2557 break;
2558 }
2559
2560 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2561 net_adj) & ~(blksize - 1)) + net_adj - 2;
2562 }
2563 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2564
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload)2565 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2566 {
2567 const struct xfrm_mode *inner_mode;
2568 const struct xfrm_mode *outer_mode;
2569 int family = x->props.family;
2570 int err;
2571
2572 if (family == AF_INET &&
2573 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2574 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2575
2576 err = -EPROTONOSUPPORT;
2577
2578 if (x->sel.family != AF_UNSPEC) {
2579 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2580 if (inner_mode == NULL)
2581 goto error;
2582
2583 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2584 family != x->sel.family)
2585 goto error;
2586
2587 x->inner_mode = *inner_mode;
2588 } else {
2589 const struct xfrm_mode *inner_mode_iaf;
2590 int iafamily = AF_INET;
2591
2592 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2593 if (inner_mode == NULL)
2594 goto error;
2595
2596 x->inner_mode = *inner_mode;
2597
2598 if (x->props.family == AF_INET)
2599 iafamily = AF_INET6;
2600
2601 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2602 if (inner_mode_iaf) {
2603 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2604 x->inner_mode_iaf = *inner_mode_iaf;
2605 }
2606 }
2607
2608 x->type = xfrm_get_type(x->id.proto, family);
2609 if (x->type == NULL)
2610 goto error;
2611
2612 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2613
2614 err = x->type->init_state(x);
2615 if (err)
2616 goto error;
2617
2618 outer_mode = xfrm_get_mode(x->props.mode, family);
2619 if (!outer_mode) {
2620 err = -EPROTONOSUPPORT;
2621 goto error;
2622 }
2623
2624 x->outer_mode = *outer_mode;
2625 if (init_replay) {
2626 err = xfrm_init_replay(x);
2627 if (err)
2628 goto error;
2629 }
2630
2631 error:
2632 return err;
2633 }
2634
2635 EXPORT_SYMBOL(__xfrm_init_state);
2636
xfrm_init_state(struct xfrm_state * x)2637 int xfrm_init_state(struct xfrm_state *x)
2638 {
2639 int err;
2640
2641 err = __xfrm_init_state(x, true, false);
2642 if (!err)
2643 x->km.state = XFRM_STATE_VALID;
2644
2645 return err;
2646 }
2647
2648 EXPORT_SYMBOL(xfrm_init_state);
2649
xfrm_state_init(struct net * net)2650 int __net_init xfrm_state_init(struct net *net)
2651 {
2652 unsigned int sz;
2653
2654 if (net_eq(net, &init_net))
2655 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2656 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2657
2658 INIT_LIST_HEAD(&net->xfrm.state_all);
2659
2660 sz = sizeof(struct hlist_head) * 8;
2661
2662 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2663 if (!net->xfrm.state_bydst)
2664 goto out_bydst;
2665 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2666 if (!net->xfrm.state_bysrc)
2667 goto out_bysrc;
2668 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2669 if (!net->xfrm.state_byspi)
2670 goto out_byspi;
2671 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2672
2673 net->xfrm.state_num = 0;
2674 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2675 spin_lock_init(&net->xfrm.xfrm_state_lock);
2676 seqcount_init(&net->xfrm.xfrm_state_hash_generation);
2677 return 0;
2678
2679 out_byspi:
2680 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2681 out_bysrc:
2682 xfrm_hash_free(net->xfrm.state_bydst, sz);
2683 out_bydst:
2684 return -ENOMEM;
2685 }
2686
xfrm_state_fini(struct net * net)2687 void xfrm_state_fini(struct net *net)
2688 {
2689 unsigned int sz;
2690
2691 flush_work(&net->xfrm.state_hash_work);
2692 flush_work(&xfrm_state_gc_work);
2693 xfrm_state_flush(net, 0, false, true);
2694
2695 WARN_ON(!list_empty(&net->xfrm.state_all));
2696
2697 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2698 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2699 xfrm_hash_free(net->xfrm.state_byspi, sz);
2700 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2701 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2702 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2703 xfrm_hash_free(net->xfrm.state_bydst, sz);
2704 }
2705
2706 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2707 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2708 struct audit_buffer *audit_buf)
2709 {
2710 struct xfrm_sec_ctx *ctx = x->security;
2711 u32 spi = ntohl(x->id.spi);
2712
2713 if (ctx)
2714 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2715 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2716
2717 switch (x->props.family) {
2718 case AF_INET:
2719 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2720 &x->props.saddr.a4, &x->id.daddr.a4);
2721 break;
2722 case AF_INET6:
2723 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2724 x->props.saddr.a6, x->id.daddr.a6);
2725 break;
2726 }
2727
2728 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2729 }
2730
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2731 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2732 struct audit_buffer *audit_buf)
2733 {
2734 const struct iphdr *iph4;
2735 const struct ipv6hdr *iph6;
2736
2737 switch (family) {
2738 case AF_INET:
2739 iph4 = ip_hdr(skb);
2740 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2741 &iph4->saddr, &iph4->daddr);
2742 break;
2743 case AF_INET6:
2744 iph6 = ipv6_hdr(skb);
2745 audit_log_format(audit_buf,
2746 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2747 &iph6->saddr, &iph6->daddr,
2748 iph6->flow_lbl[0] & 0x0f,
2749 iph6->flow_lbl[1],
2750 iph6->flow_lbl[2]);
2751 break;
2752 }
2753 }
2754
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2755 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2756 {
2757 struct audit_buffer *audit_buf;
2758
2759 audit_buf = xfrm_audit_start("SAD-add");
2760 if (audit_buf == NULL)
2761 return;
2762 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2763 xfrm_audit_helper_sainfo(x, audit_buf);
2764 audit_log_format(audit_buf, " res=%u", result);
2765 audit_log_end(audit_buf);
2766 }
2767 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2768
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)2769 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2770 {
2771 struct audit_buffer *audit_buf;
2772
2773 audit_buf = xfrm_audit_start("SAD-delete");
2774 if (audit_buf == NULL)
2775 return;
2776 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2777 xfrm_audit_helper_sainfo(x, audit_buf);
2778 audit_log_format(audit_buf, " res=%u", result);
2779 audit_log_end(audit_buf);
2780 }
2781 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2782
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)2783 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2784 struct sk_buff *skb)
2785 {
2786 struct audit_buffer *audit_buf;
2787 u32 spi;
2788
2789 audit_buf = xfrm_audit_start("SA-replay-overflow");
2790 if (audit_buf == NULL)
2791 return;
2792 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2793 /* don't record the sequence number because it's inherent in this kind
2794 * of audit message */
2795 spi = ntohl(x->id.spi);
2796 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2797 audit_log_end(audit_buf);
2798 }
2799 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2800
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)2801 void xfrm_audit_state_replay(struct xfrm_state *x,
2802 struct sk_buff *skb, __be32 net_seq)
2803 {
2804 struct audit_buffer *audit_buf;
2805 u32 spi;
2806
2807 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2808 if (audit_buf == NULL)
2809 return;
2810 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2811 spi = ntohl(x->id.spi);
2812 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2813 spi, spi, ntohl(net_seq));
2814 audit_log_end(audit_buf);
2815 }
2816 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2817
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)2818 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2819 {
2820 struct audit_buffer *audit_buf;
2821
2822 audit_buf = xfrm_audit_start("SA-notfound");
2823 if (audit_buf == NULL)
2824 return;
2825 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2826 audit_log_end(audit_buf);
2827 }
2828 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2829
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)2830 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2831 __be32 net_spi, __be32 net_seq)
2832 {
2833 struct audit_buffer *audit_buf;
2834 u32 spi;
2835
2836 audit_buf = xfrm_audit_start("SA-notfound");
2837 if (audit_buf == NULL)
2838 return;
2839 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2840 spi = ntohl(net_spi);
2841 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2842 spi, spi, ntohl(net_seq));
2843 audit_log_end(audit_buf);
2844 }
2845 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2846
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)2847 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2848 struct sk_buff *skb, u8 proto)
2849 {
2850 struct audit_buffer *audit_buf;
2851 __be32 net_spi;
2852 __be32 net_seq;
2853
2854 audit_buf = xfrm_audit_start("SA-icv-failure");
2855 if (audit_buf == NULL)
2856 return;
2857 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2858 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2859 u32 spi = ntohl(net_spi);
2860 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2861 spi, spi, ntohl(net_seq));
2862 }
2863 audit_log_end(audit_buf);
2864 }
2865 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2866 #endif /* CONFIG_AUDITSYSCALL */
2867