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->mapping_maxage = orig->mapping_maxage;
1560 x->lastused = orig->lastused;
1561 x->new_mapping = 0;
1562 x->new_mapping_sport = 0;
1563
1564 return x;
1565
1566 error:
1567 xfrm_state_put(x);
1568 out:
1569 return NULL;
1570 }
1571
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1572 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1573 u32 if_id)
1574 {
1575 unsigned int h;
1576 struct xfrm_state *x = NULL;
1577
1578 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1579
1580 if (m->reqid) {
1581 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1582 m->reqid, m->old_family);
1583 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1584 if (x->props.mode != m->mode ||
1585 x->id.proto != m->proto)
1586 continue;
1587 if (m->reqid && x->props.reqid != m->reqid)
1588 continue;
1589 if (if_id != 0 && x->if_id != if_id)
1590 continue;
1591 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1592 m->old_family) ||
1593 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1594 m->old_family))
1595 continue;
1596 xfrm_state_hold(x);
1597 break;
1598 }
1599 } else {
1600 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1601 m->old_family);
1602 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1603 if (x->props.mode != m->mode ||
1604 x->id.proto != m->proto)
1605 continue;
1606 if (if_id != 0 && x->if_id != if_id)
1607 continue;
1608 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1609 m->old_family) ||
1610 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1611 m->old_family))
1612 continue;
1613 xfrm_state_hold(x);
1614 break;
1615 }
1616 }
1617
1618 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1619
1620 return x;
1621 }
1622 EXPORT_SYMBOL(xfrm_migrate_state_find);
1623
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1624 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1625 struct xfrm_migrate *m,
1626 struct xfrm_encap_tmpl *encap)
1627 {
1628 struct xfrm_state *xc;
1629
1630 xc = xfrm_state_clone(x, encap);
1631 if (!xc)
1632 return NULL;
1633
1634 xc->props.family = m->new_family;
1635
1636 if (xfrm_init_state(xc) < 0)
1637 goto error;
1638
1639 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1640 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1641
1642 /* add state */
1643 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1644 /* a care is needed when the destination address of the
1645 state is to be updated as it is a part of triplet */
1646 xfrm_state_insert(xc);
1647 } else {
1648 if (xfrm_state_add(xc) < 0)
1649 goto error;
1650 }
1651
1652 return xc;
1653 error:
1654 xfrm_state_put(xc);
1655 return NULL;
1656 }
1657 EXPORT_SYMBOL(xfrm_state_migrate);
1658 #endif
1659
xfrm_state_update(struct xfrm_state * x)1660 int xfrm_state_update(struct xfrm_state *x)
1661 {
1662 struct xfrm_state *x1, *to_put;
1663 int err;
1664 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1665 struct net *net = xs_net(x);
1666
1667 to_put = NULL;
1668
1669 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1670 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1671
1672 err = -ESRCH;
1673 if (!x1)
1674 goto out;
1675
1676 if (xfrm_state_kern(x1)) {
1677 to_put = x1;
1678 err = -EEXIST;
1679 goto out;
1680 }
1681
1682 if (x1->km.state == XFRM_STATE_ACQ) {
1683 __xfrm_state_insert(x);
1684 x = NULL;
1685 }
1686 err = 0;
1687
1688 out:
1689 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1690
1691 if (to_put)
1692 xfrm_state_put(to_put);
1693
1694 if (err)
1695 return err;
1696
1697 if (!x) {
1698 xfrm_state_delete(x1);
1699 xfrm_state_put(x1);
1700 return 0;
1701 }
1702
1703 err = -EINVAL;
1704 spin_lock_bh(&x1->lock);
1705 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1706 if (x->encap && x1->encap &&
1707 x->encap->encap_type == x1->encap->encap_type)
1708 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1709 else if (x->encap || x1->encap)
1710 goto fail;
1711
1712 if (x->coaddr && x1->coaddr) {
1713 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1714 }
1715 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1716 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1717 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1718 x1->km.dying = 0;
1719
1720 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1721 HRTIMER_MODE_REL_SOFT);
1722 if (x1->curlft.use_time)
1723 xfrm_state_check_expire(x1);
1724
1725 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1726 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1727
1728 if (x->props.smark.m || x->props.smark.v)
1729 x1->props.smark = x->props.smark;
1730
1731 if (x->if_id)
1732 x1->if_id = x->if_id;
1733
1734 __xfrm_state_bump_genids(x1);
1735 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1736 }
1737
1738 err = 0;
1739 x->km.state = XFRM_STATE_DEAD;
1740 __xfrm_state_put(x);
1741 }
1742
1743 fail:
1744 spin_unlock_bh(&x1->lock);
1745
1746 xfrm_state_put(x1);
1747
1748 return err;
1749 }
1750 EXPORT_SYMBOL(xfrm_state_update);
1751
xfrm_state_check_expire(struct xfrm_state * x)1752 int xfrm_state_check_expire(struct xfrm_state *x)
1753 {
1754 if (!x->curlft.use_time)
1755 x->curlft.use_time = ktime_get_real_seconds();
1756
1757 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1758 x->curlft.packets >= x->lft.hard_packet_limit) {
1759 x->km.state = XFRM_STATE_EXPIRED;
1760 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1761 return -EINVAL;
1762 }
1763
1764 if (!x->km.dying &&
1765 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1766 x->curlft.packets >= x->lft.soft_packet_limit)) {
1767 x->km.dying = 1;
1768 km_state_expired(x, 0, 0);
1769 }
1770 return 0;
1771 }
1772 EXPORT_SYMBOL(xfrm_state_check_expire);
1773
1774 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1775 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1776 u8 proto, unsigned short family)
1777 {
1778 struct xfrm_state *x;
1779
1780 rcu_read_lock();
1781 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1782 rcu_read_unlock();
1783 return x;
1784 }
1785 EXPORT_SYMBOL(xfrm_state_lookup);
1786
1787 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)1788 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1789 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1790 u8 proto, unsigned short family)
1791 {
1792 struct xfrm_state *x;
1793
1794 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1795 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1796 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1797 return x;
1798 }
1799 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1800
1801 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)1802 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1803 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1804 const xfrm_address_t *saddr, int create, unsigned short family)
1805 {
1806 struct xfrm_state *x;
1807
1808 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1809 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1810 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1811
1812 return x;
1813 }
1814 EXPORT_SYMBOL(xfrm_find_acq);
1815
1816 #ifdef CONFIG_XFRM_SUB_POLICY
1817 #if IS_ENABLED(CONFIG_IPV6)
1818 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1819 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1820 __xfrm6_sort(void **dst, void **src, int n,
1821 int (*cmp)(const void *p), int maxclass)
1822 {
1823 int count[XFRM_MAX_DEPTH] = { };
1824 int class[XFRM_MAX_DEPTH];
1825 int i;
1826
1827 for (i = 0; i < n; i++) {
1828 int c = cmp(src[i]);
1829
1830 class[i] = c;
1831 count[c]++;
1832 }
1833
1834 for (i = 2; i < maxclass; i++)
1835 count[i] += count[i - 1];
1836
1837 for (i = 0; i < n; i++) {
1838 dst[count[class[i] - 1]++] = src[i];
1839 src[i] = NULL;
1840 }
1841 }
1842
1843 /* Rule for xfrm_state:
1844 *
1845 * rule 1: select IPsec transport except AH
1846 * rule 2: select MIPv6 RO or inbound trigger
1847 * rule 3: select IPsec transport AH
1848 * rule 4: select IPsec tunnel
1849 * rule 5: others
1850 */
__xfrm6_state_sort_cmp(const void * p)1851 static int __xfrm6_state_sort_cmp(const void *p)
1852 {
1853 const struct xfrm_state *v = p;
1854
1855 switch (v->props.mode) {
1856 case XFRM_MODE_TRANSPORT:
1857 if (v->id.proto != IPPROTO_AH)
1858 return 1;
1859 else
1860 return 3;
1861 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1862 case XFRM_MODE_ROUTEOPTIMIZATION:
1863 case XFRM_MODE_IN_TRIGGER:
1864 return 2;
1865 #endif
1866 case XFRM_MODE_TUNNEL:
1867 case XFRM_MODE_BEET:
1868 return 4;
1869 }
1870 return 5;
1871 }
1872
1873 /* Rule for xfrm_tmpl:
1874 *
1875 * rule 1: select IPsec transport
1876 * rule 2: select MIPv6 RO or inbound trigger
1877 * rule 3: select IPsec tunnel
1878 * rule 4: others
1879 */
__xfrm6_tmpl_sort_cmp(const void * p)1880 static int __xfrm6_tmpl_sort_cmp(const void *p)
1881 {
1882 const struct xfrm_tmpl *v = p;
1883
1884 switch (v->mode) {
1885 case XFRM_MODE_TRANSPORT:
1886 return 1;
1887 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1888 case XFRM_MODE_ROUTEOPTIMIZATION:
1889 case XFRM_MODE_IN_TRIGGER:
1890 return 2;
1891 #endif
1892 case XFRM_MODE_TUNNEL:
1893 case XFRM_MODE_BEET:
1894 return 3;
1895 }
1896 return 4;
1897 }
1898 #else
__xfrm6_state_sort_cmp(const void * p)1899 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)1900 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1901
1902 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1903 __xfrm6_sort(void **dst, void **src, int n,
1904 int (*cmp)(const void *p), int maxclass)
1905 {
1906 int i;
1907
1908 for (i = 0; i < n; i++)
1909 dst[i] = src[i];
1910 }
1911 #endif /* CONFIG_IPV6 */
1912
1913 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)1914 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1915 unsigned short family)
1916 {
1917 int i;
1918
1919 if (family == AF_INET6)
1920 __xfrm6_sort((void **)dst, (void **)src, n,
1921 __xfrm6_tmpl_sort_cmp, 5);
1922 else
1923 for (i = 0; i < n; i++)
1924 dst[i] = src[i];
1925 }
1926
1927 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)1928 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1929 unsigned short family)
1930 {
1931 int i;
1932
1933 if (family == AF_INET6)
1934 __xfrm6_sort((void **)dst, (void **)src, n,
1935 __xfrm6_state_sort_cmp, 6);
1936 else
1937 for (i = 0; i < n; i++)
1938 dst[i] = src[i];
1939 }
1940 #endif
1941
1942 /* Silly enough, but I'm lazy to build resolution list */
1943
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1944 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1945 {
1946 int i;
1947
1948 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1949 struct xfrm_state *x;
1950
1951 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1952 if (x->km.seq == seq &&
1953 (mark & x->mark.m) == x->mark.v &&
1954 x->km.state == XFRM_STATE_ACQ) {
1955 xfrm_state_hold(x);
1956 return x;
1957 }
1958 }
1959 }
1960 return NULL;
1961 }
1962
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1963 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1964 {
1965 struct xfrm_state *x;
1966
1967 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1968 x = __xfrm_find_acq_byseq(net, mark, seq);
1969 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1970 return x;
1971 }
1972 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1973
xfrm_get_acqseq(void)1974 u32 xfrm_get_acqseq(void)
1975 {
1976 u32 res;
1977 static atomic_t acqseq;
1978
1979 do {
1980 res = atomic_inc_return(&acqseq);
1981 } while (!res);
1982
1983 return res;
1984 }
1985 EXPORT_SYMBOL(xfrm_get_acqseq);
1986
verify_spi_info(u8 proto,u32 min,u32 max)1987 int verify_spi_info(u8 proto, u32 min, u32 max)
1988 {
1989 switch (proto) {
1990 case IPPROTO_AH:
1991 case IPPROTO_ESP:
1992 break;
1993
1994 case IPPROTO_COMP:
1995 /* IPCOMP spi is 16-bits. */
1996 if (max >= 0x10000)
1997 return -EINVAL;
1998 break;
1999
2000 default:
2001 return -EINVAL;
2002 }
2003
2004 if (min > max)
2005 return -EINVAL;
2006
2007 return 0;
2008 }
2009 EXPORT_SYMBOL(verify_spi_info);
2010
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high)2011 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2012 {
2013 struct net *net = xs_net(x);
2014 unsigned int h;
2015 struct xfrm_state *x0;
2016 int err = -ENOENT;
2017 __be32 minspi = htonl(low);
2018 __be32 maxspi = htonl(high);
2019 __be32 newspi = 0;
2020 u32 mark = x->mark.v & x->mark.m;
2021
2022 spin_lock_bh(&x->lock);
2023 if (x->km.state == XFRM_STATE_DEAD)
2024 goto unlock;
2025
2026 err = 0;
2027 if (x->id.spi)
2028 goto unlock;
2029
2030 err = -ENOENT;
2031
2032 if (minspi == maxspi) {
2033 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2034 if (x0) {
2035 xfrm_state_put(x0);
2036 goto unlock;
2037 }
2038 newspi = minspi;
2039 } else {
2040 u32 spi = 0;
2041 for (h = 0; h < high-low+1; h++) {
2042 spi = low + prandom_u32()%(high-low+1);
2043 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2044 if (x0 == NULL) {
2045 newspi = htonl(spi);
2046 break;
2047 }
2048 xfrm_state_put(x0);
2049 }
2050 }
2051 if (newspi) {
2052 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2053 x->id.spi = newspi;
2054 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2055 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2056 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2057
2058 err = 0;
2059 }
2060
2061 unlock:
2062 spin_unlock_bh(&x->lock);
2063
2064 return err;
2065 }
2066 EXPORT_SYMBOL(xfrm_alloc_spi);
2067
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2068 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2069 struct xfrm_address_filter *filter)
2070 {
2071 if (filter) {
2072 if ((filter->family == AF_INET ||
2073 filter->family == AF_INET6) &&
2074 x->props.family != filter->family)
2075 return false;
2076
2077 return addr_match(&x->props.saddr, &filter->saddr,
2078 filter->splen) &&
2079 addr_match(&x->id.daddr, &filter->daddr,
2080 filter->dplen);
2081 }
2082 return true;
2083 }
2084
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2085 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2086 int (*func)(struct xfrm_state *, int, void*),
2087 void *data)
2088 {
2089 struct xfrm_state *state;
2090 struct xfrm_state_walk *x;
2091 int err = 0;
2092
2093 if (walk->seq != 0 && list_empty(&walk->all))
2094 return 0;
2095
2096 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2097 if (list_empty(&walk->all))
2098 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2099 else
2100 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2101 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2102 if (x->state == XFRM_STATE_DEAD)
2103 continue;
2104 state = container_of(x, struct xfrm_state, km);
2105 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2106 continue;
2107 if (!__xfrm_state_filter_match(state, walk->filter))
2108 continue;
2109 err = func(state, walk->seq, data);
2110 if (err) {
2111 list_move_tail(&walk->all, &x->all);
2112 goto out;
2113 }
2114 walk->seq++;
2115 }
2116 if (walk->seq == 0) {
2117 err = -ENOENT;
2118 goto out;
2119 }
2120 list_del_init(&walk->all);
2121 out:
2122 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2123 return err;
2124 }
2125 EXPORT_SYMBOL(xfrm_state_walk);
2126
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2127 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2128 struct xfrm_address_filter *filter)
2129 {
2130 INIT_LIST_HEAD(&walk->all);
2131 walk->proto = proto;
2132 walk->state = XFRM_STATE_DEAD;
2133 walk->seq = 0;
2134 walk->filter = filter;
2135 }
2136 EXPORT_SYMBOL(xfrm_state_walk_init);
2137
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2138 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2139 {
2140 kfree(walk->filter);
2141
2142 if (list_empty(&walk->all))
2143 return;
2144
2145 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2146 list_del(&walk->all);
2147 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2148 }
2149 EXPORT_SYMBOL(xfrm_state_walk_done);
2150
xfrm_replay_timer_handler(struct timer_list * t)2151 static void xfrm_replay_timer_handler(struct timer_list *t)
2152 {
2153 struct xfrm_state *x = from_timer(x, t, rtimer);
2154
2155 spin_lock(&x->lock);
2156
2157 if (x->km.state == XFRM_STATE_VALID) {
2158 if (xfrm_aevent_is_on(xs_net(x)))
2159 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2160 else
2161 x->xflags |= XFRM_TIME_DEFER;
2162 }
2163
2164 spin_unlock(&x->lock);
2165 }
2166
2167 static LIST_HEAD(xfrm_km_list);
2168
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2169 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2170 {
2171 struct xfrm_mgr *km;
2172
2173 rcu_read_lock();
2174 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2175 if (km->notify_policy)
2176 km->notify_policy(xp, dir, c);
2177 rcu_read_unlock();
2178 }
2179
km_state_notify(struct xfrm_state * x,const struct km_event * c)2180 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2181 {
2182 struct xfrm_mgr *km;
2183 rcu_read_lock();
2184 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2185 if (km->notify)
2186 km->notify(x, c);
2187 rcu_read_unlock();
2188 }
2189
2190 EXPORT_SYMBOL(km_policy_notify);
2191 EXPORT_SYMBOL(km_state_notify);
2192
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2193 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2194 {
2195 struct km_event c;
2196
2197 c.data.hard = hard;
2198 c.portid = portid;
2199 c.event = XFRM_MSG_EXPIRE;
2200 km_state_notify(x, &c);
2201 }
2202
2203 EXPORT_SYMBOL(km_state_expired);
2204 /*
2205 * We send to all registered managers regardless of failure
2206 * We are happy with one success
2207 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2208 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2209 {
2210 int err = -EINVAL, acqret;
2211 struct xfrm_mgr *km;
2212
2213 rcu_read_lock();
2214 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2215 acqret = km->acquire(x, t, pol);
2216 if (!acqret)
2217 err = acqret;
2218 }
2219 rcu_read_unlock();
2220 return err;
2221 }
2222 EXPORT_SYMBOL(km_query);
2223
__km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2224 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2225 {
2226 int err = -EINVAL;
2227 struct xfrm_mgr *km;
2228
2229 rcu_read_lock();
2230 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2231 if (km->new_mapping)
2232 err = km->new_mapping(x, ipaddr, sport);
2233 if (!err)
2234 break;
2235 }
2236 rcu_read_unlock();
2237 return err;
2238 }
2239
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2240 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2241 {
2242 int ret = 0;
2243
2244 if (x->mapping_maxage) {
2245 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2246 x->new_mapping_sport != sport) {
2247 x->new_mapping_sport = sport;
2248 x->new_mapping = jiffies / HZ;
2249 ret = __km_new_mapping(x, ipaddr, sport);
2250 }
2251 } else {
2252 ret = __km_new_mapping(x, ipaddr, sport);
2253 }
2254
2255 return ret;
2256 }
2257 EXPORT_SYMBOL(km_new_mapping);
2258
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2259 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2260 {
2261 struct km_event c;
2262
2263 c.data.hard = hard;
2264 c.portid = portid;
2265 c.event = XFRM_MSG_POLEXPIRE;
2266 km_policy_notify(pol, dir, &c);
2267 }
2268 EXPORT_SYMBOL(km_policy_expired);
2269
2270 #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)2271 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2272 const struct xfrm_migrate *m, int num_migrate,
2273 const struct xfrm_kmaddress *k,
2274 const struct xfrm_encap_tmpl *encap)
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->migrate) {
2283 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2284 encap);
2285 if (!ret)
2286 err = ret;
2287 }
2288 }
2289 rcu_read_unlock();
2290 return err;
2291 }
2292 EXPORT_SYMBOL(km_migrate);
2293 #endif
2294
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2295 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2296 {
2297 int err = -EINVAL;
2298 int ret;
2299 struct xfrm_mgr *km;
2300
2301 rcu_read_lock();
2302 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2303 if (km->report) {
2304 ret = km->report(net, proto, sel, addr);
2305 if (!ret)
2306 err = ret;
2307 }
2308 }
2309 rcu_read_unlock();
2310 return err;
2311 }
2312 EXPORT_SYMBOL(km_report);
2313
km_is_alive(const struct km_event * c)2314 static bool km_is_alive(const struct km_event *c)
2315 {
2316 struct xfrm_mgr *km;
2317 bool is_alive = false;
2318
2319 rcu_read_lock();
2320 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2321 if (km->is_alive && km->is_alive(c)) {
2322 is_alive = true;
2323 break;
2324 }
2325 }
2326 rcu_read_unlock();
2327
2328 return is_alive;
2329 }
2330
2331 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2332 static DEFINE_SPINLOCK(xfrm_translator_lock);
2333 static struct xfrm_translator __rcu *xfrm_translator;
2334
xfrm_get_translator(void)2335 struct xfrm_translator *xfrm_get_translator(void)
2336 {
2337 struct xfrm_translator *xtr;
2338
2339 rcu_read_lock();
2340 xtr = rcu_dereference(xfrm_translator);
2341 if (unlikely(!xtr))
2342 goto out;
2343 if (!try_module_get(xtr->owner))
2344 xtr = NULL;
2345 out:
2346 rcu_read_unlock();
2347 return xtr;
2348 }
2349 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2350
xfrm_put_translator(struct xfrm_translator * xtr)2351 void xfrm_put_translator(struct xfrm_translator *xtr)
2352 {
2353 module_put(xtr->owner);
2354 }
2355 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2356
xfrm_register_translator(struct xfrm_translator * xtr)2357 int xfrm_register_translator(struct xfrm_translator *xtr)
2358 {
2359 int err = 0;
2360
2361 spin_lock_bh(&xfrm_translator_lock);
2362 if (unlikely(xfrm_translator != NULL))
2363 err = -EEXIST;
2364 else
2365 rcu_assign_pointer(xfrm_translator, xtr);
2366 spin_unlock_bh(&xfrm_translator_lock);
2367
2368 return err;
2369 }
2370 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2371
xfrm_unregister_translator(struct xfrm_translator * xtr)2372 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2373 {
2374 int err = 0;
2375
2376 spin_lock_bh(&xfrm_translator_lock);
2377 if (likely(xfrm_translator != NULL)) {
2378 if (rcu_access_pointer(xfrm_translator) != xtr)
2379 err = -EINVAL;
2380 else
2381 RCU_INIT_POINTER(xfrm_translator, NULL);
2382 }
2383 spin_unlock_bh(&xfrm_translator_lock);
2384 synchronize_rcu();
2385
2386 return err;
2387 }
2388 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2389 #endif
2390
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2391 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2392 {
2393 int err;
2394 u8 *data;
2395 struct xfrm_mgr *km;
2396 struct xfrm_policy *pol = NULL;
2397
2398 if (sockptr_is_null(optval) && !optlen) {
2399 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2400 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2401 __sk_dst_reset(sk);
2402 return 0;
2403 }
2404
2405 if (optlen <= 0 || optlen > PAGE_SIZE)
2406 return -EMSGSIZE;
2407
2408 data = memdup_sockptr(optval, optlen);
2409 if (IS_ERR(data))
2410 return PTR_ERR(data);
2411
2412 if (in_compat_syscall()) {
2413 struct xfrm_translator *xtr = xfrm_get_translator();
2414
2415 if (!xtr) {
2416 kfree(data);
2417 return -EOPNOTSUPP;
2418 }
2419
2420 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2421 xfrm_put_translator(xtr);
2422 if (err) {
2423 kfree(data);
2424 return err;
2425 }
2426 }
2427
2428 err = -EINVAL;
2429 rcu_read_lock();
2430 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2431 pol = km->compile_policy(sk, optname, data,
2432 optlen, &err);
2433 if (err >= 0)
2434 break;
2435 }
2436 rcu_read_unlock();
2437
2438 if (err >= 0) {
2439 xfrm_sk_policy_insert(sk, err, pol);
2440 xfrm_pol_put(pol);
2441 __sk_dst_reset(sk);
2442 err = 0;
2443 }
2444
2445 kfree(data);
2446 return err;
2447 }
2448 EXPORT_SYMBOL(xfrm_user_policy);
2449
2450 static DEFINE_SPINLOCK(xfrm_km_lock);
2451
xfrm_register_km(struct xfrm_mgr * km)2452 int xfrm_register_km(struct xfrm_mgr *km)
2453 {
2454 spin_lock_bh(&xfrm_km_lock);
2455 list_add_tail_rcu(&km->list, &xfrm_km_list);
2456 spin_unlock_bh(&xfrm_km_lock);
2457 return 0;
2458 }
2459 EXPORT_SYMBOL(xfrm_register_km);
2460
xfrm_unregister_km(struct xfrm_mgr * km)2461 int xfrm_unregister_km(struct xfrm_mgr *km)
2462 {
2463 spin_lock_bh(&xfrm_km_lock);
2464 list_del_rcu(&km->list);
2465 spin_unlock_bh(&xfrm_km_lock);
2466 synchronize_rcu();
2467 return 0;
2468 }
2469 EXPORT_SYMBOL(xfrm_unregister_km);
2470
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2471 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2472 {
2473 int err = 0;
2474
2475 if (WARN_ON(afinfo->family >= NPROTO))
2476 return -EAFNOSUPPORT;
2477
2478 spin_lock_bh(&xfrm_state_afinfo_lock);
2479 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2480 err = -EEXIST;
2481 else
2482 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2483 spin_unlock_bh(&xfrm_state_afinfo_lock);
2484 return err;
2485 }
2486 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2487
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2488 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2489 {
2490 int err = 0, family = afinfo->family;
2491
2492 if (WARN_ON(family >= NPROTO))
2493 return -EAFNOSUPPORT;
2494
2495 spin_lock_bh(&xfrm_state_afinfo_lock);
2496 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2497 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2498 err = -EINVAL;
2499 else
2500 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2501 }
2502 spin_unlock_bh(&xfrm_state_afinfo_lock);
2503 synchronize_rcu();
2504 return err;
2505 }
2506 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2507
xfrm_state_afinfo_get_rcu(unsigned int family)2508 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2509 {
2510 if (unlikely(family >= NPROTO))
2511 return NULL;
2512
2513 return rcu_dereference(xfrm_state_afinfo[family]);
2514 }
2515 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2516
xfrm_state_get_afinfo(unsigned int family)2517 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2518 {
2519 struct xfrm_state_afinfo *afinfo;
2520 if (unlikely(family >= NPROTO))
2521 return NULL;
2522 rcu_read_lock();
2523 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2524 if (unlikely(!afinfo))
2525 rcu_read_unlock();
2526 return afinfo;
2527 }
2528
xfrm_flush_gc(void)2529 void xfrm_flush_gc(void)
2530 {
2531 flush_work(&xfrm_state_gc_work);
2532 }
2533 EXPORT_SYMBOL(xfrm_flush_gc);
2534
2535 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2536 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2537 {
2538 if (x->tunnel) {
2539 struct xfrm_state *t = x->tunnel;
2540
2541 if (atomic_read(&t->tunnel_users) == 2)
2542 xfrm_state_delete(t);
2543 atomic_dec(&t->tunnel_users);
2544 xfrm_state_put_sync(t);
2545 x->tunnel = NULL;
2546 }
2547 }
2548 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2549
xfrm_state_mtu(struct xfrm_state * x,int mtu)2550 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2551 {
2552 const struct xfrm_type *type = READ_ONCE(x->type);
2553 struct crypto_aead *aead;
2554 u32 blksize, net_adj = 0;
2555
2556 if (x->km.state != XFRM_STATE_VALID ||
2557 !type || type->proto != IPPROTO_ESP)
2558 return mtu - x->props.header_len;
2559
2560 aead = x->data;
2561 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2562
2563 switch (x->props.mode) {
2564 case XFRM_MODE_TRANSPORT:
2565 case XFRM_MODE_BEET:
2566 if (x->props.family == AF_INET)
2567 net_adj = sizeof(struct iphdr);
2568 else if (x->props.family == AF_INET6)
2569 net_adj = sizeof(struct ipv6hdr);
2570 break;
2571 case XFRM_MODE_TUNNEL:
2572 break;
2573 default:
2574 WARN_ON_ONCE(1);
2575 break;
2576 }
2577
2578 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2579 net_adj) & ~(blksize - 1)) + net_adj - 2;
2580 }
2581 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2582
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload)2583 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2584 {
2585 const struct xfrm_mode *inner_mode;
2586 const struct xfrm_mode *outer_mode;
2587 int family = x->props.family;
2588 int err;
2589
2590 if (family == AF_INET &&
2591 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2592 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2593
2594 err = -EPROTONOSUPPORT;
2595
2596 if (x->sel.family != AF_UNSPEC) {
2597 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2598 if (inner_mode == NULL)
2599 goto error;
2600
2601 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2602 family != x->sel.family)
2603 goto error;
2604
2605 x->inner_mode = *inner_mode;
2606 } else {
2607 const struct xfrm_mode *inner_mode_iaf;
2608 int iafamily = AF_INET;
2609
2610 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2611 if (inner_mode == NULL)
2612 goto error;
2613
2614 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2615 goto error;
2616
2617 x->inner_mode = *inner_mode;
2618
2619 if (x->props.family == AF_INET)
2620 iafamily = AF_INET6;
2621
2622 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2623 if (inner_mode_iaf) {
2624 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2625 x->inner_mode_iaf = *inner_mode_iaf;
2626 }
2627 }
2628
2629 x->type = xfrm_get_type(x->id.proto, family);
2630 if (x->type == NULL)
2631 goto error;
2632
2633 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2634
2635 err = x->type->init_state(x);
2636 if (err)
2637 goto error;
2638
2639 outer_mode = xfrm_get_mode(x->props.mode, family);
2640 if (!outer_mode) {
2641 err = -EPROTONOSUPPORT;
2642 goto error;
2643 }
2644
2645 x->outer_mode = *outer_mode;
2646 if (init_replay) {
2647 err = xfrm_init_replay(x);
2648 if (err)
2649 goto error;
2650 }
2651
2652 error:
2653 return err;
2654 }
2655
2656 EXPORT_SYMBOL(__xfrm_init_state);
2657
xfrm_init_state(struct xfrm_state * x)2658 int xfrm_init_state(struct xfrm_state *x)
2659 {
2660 int err;
2661
2662 err = __xfrm_init_state(x, true, false);
2663 if (!err)
2664 x->km.state = XFRM_STATE_VALID;
2665
2666 return err;
2667 }
2668
2669 EXPORT_SYMBOL(xfrm_init_state);
2670
xfrm_state_init(struct net * net)2671 int __net_init xfrm_state_init(struct net *net)
2672 {
2673 unsigned int sz;
2674
2675 if (net_eq(net, &init_net))
2676 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2677 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2678
2679 INIT_LIST_HEAD(&net->xfrm.state_all);
2680
2681 sz = sizeof(struct hlist_head) * 8;
2682
2683 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2684 if (!net->xfrm.state_bydst)
2685 goto out_bydst;
2686 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2687 if (!net->xfrm.state_bysrc)
2688 goto out_bysrc;
2689 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2690 if (!net->xfrm.state_byspi)
2691 goto out_byspi;
2692 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2693
2694 net->xfrm.state_num = 0;
2695 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2696 spin_lock_init(&net->xfrm.xfrm_state_lock);
2697 seqcount_init(&net->xfrm.xfrm_state_hash_generation);
2698 return 0;
2699
2700 out_byspi:
2701 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2702 out_bysrc:
2703 xfrm_hash_free(net->xfrm.state_bydst, sz);
2704 out_bydst:
2705 return -ENOMEM;
2706 }
2707
xfrm_state_fini(struct net * net)2708 void xfrm_state_fini(struct net *net)
2709 {
2710 unsigned int sz;
2711
2712 flush_work(&net->xfrm.state_hash_work);
2713 flush_work(&xfrm_state_gc_work);
2714 xfrm_state_flush(net, 0, false, true);
2715
2716 WARN_ON(!list_empty(&net->xfrm.state_all));
2717
2718 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2719 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2720 xfrm_hash_free(net->xfrm.state_byspi, sz);
2721 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2722 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2723 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2724 xfrm_hash_free(net->xfrm.state_bydst, sz);
2725 }
2726
2727 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2728 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2729 struct audit_buffer *audit_buf)
2730 {
2731 struct xfrm_sec_ctx *ctx = x->security;
2732 u32 spi = ntohl(x->id.spi);
2733
2734 if (ctx)
2735 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2736 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2737
2738 switch (x->props.family) {
2739 case AF_INET:
2740 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2741 &x->props.saddr.a4, &x->id.daddr.a4);
2742 break;
2743 case AF_INET6:
2744 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2745 x->props.saddr.a6, x->id.daddr.a6);
2746 break;
2747 }
2748
2749 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2750 }
2751
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2752 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2753 struct audit_buffer *audit_buf)
2754 {
2755 const struct iphdr *iph4;
2756 const struct ipv6hdr *iph6;
2757
2758 switch (family) {
2759 case AF_INET:
2760 iph4 = ip_hdr(skb);
2761 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2762 &iph4->saddr, &iph4->daddr);
2763 break;
2764 case AF_INET6:
2765 iph6 = ipv6_hdr(skb);
2766 audit_log_format(audit_buf,
2767 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2768 &iph6->saddr, &iph6->daddr,
2769 iph6->flow_lbl[0] & 0x0f,
2770 iph6->flow_lbl[1],
2771 iph6->flow_lbl[2]);
2772 break;
2773 }
2774 }
2775
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2776 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2777 {
2778 struct audit_buffer *audit_buf;
2779
2780 audit_buf = xfrm_audit_start("SAD-add");
2781 if (audit_buf == NULL)
2782 return;
2783 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2784 xfrm_audit_helper_sainfo(x, audit_buf);
2785 audit_log_format(audit_buf, " res=%u", result);
2786 audit_log_end(audit_buf);
2787 }
2788 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2789
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)2790 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2791 {
2792 struct audit_buffer *audit_buf;
2793
2794 audit_buf = xfrm_audit_start("SAD-delete");
2795 if (audit_buf == NULL)
2796 return;
2797 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2798 xfrm_audit_helper_sainfo(x, audit_buf);
2799 audit_log_format(audit_buf, " res=%u", result);
2800 audit_log_end(audit_buf);
2801 }
2802 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2803
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)2804 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2805 struct sk_buff *skb)
2806 {
2807 struct audit_buffer *audit_buf;
2808 u32 spi;
2809
2810 audit_buf = xfrm_audit_start("SA-replay-overflow");
2811 if (audit_buf == NULL)
2812 return;
2813 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2814 /* don't record the sequence number because it's inherent in this kind
2815 * of audit message */
2816 spi = ntohl(x->id.spi);
2817 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2818 audit_log_end(audit_buf);
2819 }
2820 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2821
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)2822 void xfrm_audit_state_replay(struct xfrm_state *x,
2823 struct sk_buff *skb, __be32 net_seq)
2824 {
2825 struct audit_buffer *audit_buf;
2826 u32 spi;
2827
2828 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2829 if (audit_buf == NULL)
2830 return;
2831 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2832 spi = ntohl(x->id.spi);
2833 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2834 spi, spi, ntohl(net_seq));
2835 audit_log_end(audit_buf);
2836 }
2837 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2838
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)2839 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2840 {
2841 struct audit_buffer *audit_buf;
2842
2843 audit_buf = xfrm_audit_start("SA-notfound");
2844 if (audit_buf == NULL)
2845 return;
2846 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2847 audit_log_end(audit_buf);
2848 }
2849 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2850
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)2851 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2852 __be32 net_spi, __be32 net_seq)
2853 {
2854 struct audit_buffer *audit_buf;
2855 u32 spi;
2856
2857 audit_buf = xfrm_audit_start("SA-notfound");
2858 if (audit_buf == NULL)
2859 return;
2860 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2861 spi = ntohl(net_spi);
2862 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2863 spi, spi, ntohl(net_seq));
2864 audit_log_end(audit_buf);
2865 }
2866 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2867
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)2868 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2869 struct sk_buff *skb, u8 proto)
2870 {
2871 struct audit_buffer *audit_buf;
2872 __be32 net_spi;
2873 __be32 net_seq;
2874
2875 audit_buf = xfrm_audit_start("SA-icv-failure");
2876 if (audit_buf == NULL)
2877 return;
2878 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2879 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2880 u32 spi = ntohl(net_spi);
2881 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2882 spi, spi, ntohl(net_seq));
2883 }
2884 audit_log_end(audit_buf);
2885 }
2886 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2887 #endif /* CONFIG_AUDITSYSCALL */
2888