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/compat.h>
18 #include <linux/workqueue.h>
19 #include <net/xfrm.h>
20 #include <linux/pfkeyv2.h>
21 #include <linux/ipsec.h>
22 #include <linux/module.h>
23 #include <linux/cache.h>
24 #include <linux/audit.h>
25 #include <linux/uaccess.h>
26 #include <linux/ktime.h>
27 #include <linux/slab.h>
28 #include <linux/interrupt.h>
29 #include <linux/kernel.h>
30
31 #include <crypto/aead.h>
32
33 #include "xfrm_hash.h"
34
35 #define xfrm_state_deref_prot(table, net) \
36 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
37
38 static void xfrm_state_gc_task(struct work_struct *work);
39
40 /* Each xfrm_state may be linked to two tables:
41
42 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
43 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
44 destination/tunnel endpoint. (output)
45 */
46
47 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
48 static struct kmem_cache *xfrm_state_cache __ro_after_init;
49
50 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
51 static HLIST_HEAD(xfrm_state_gc_list);
52
xfrm_state_hold_rcu(struct xfrm_state __rcu * x)53 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
54 {
55 return refcount_inc_not_zero(&x->refcnt);
56 }
57
xfrm_dst_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u32 reqid,unsigned short family)58 static inline unsigned int xfrm_dst_hash(struct net *net,
59 const xfrm_address_t *daddr,
60 const xfrm_address_t *saddr,
61 u32 reqid,
62 unsigned short family)
63 {
64 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
65 }
66
xfrm_src_hash(struct net * net,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)67 static inline unsigned int xfrm_src_hash(struct net *net,
68 const xfrm_address_t *daddr,
69 const xfrm_address_t *saddr,
70 unsigned short family)
71 {
72 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
73 }
74
75 static inline unsigned int
xfrm_spi_hash(struct net * net,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)76 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
77 __be32 spi, u8 proto, unsigned short family)
78 {
79 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
80 }
81
xfrm_seq_hash(struct net * net,u32 seq)82 static unsigned int xfrm_seq_hash(struct net *net, u32 seq)
83 {
84 return __xfrm_seq_hash(seq, net->xfrm.state_hmask);
85 }
86
xfrm_hash_transfer(struct hlist_head * list,struct hlist_head * ndsttable,struct hlist_head * nsrctable,struct hlist_head * nspitable,struct hlist_head * nseqtable,unsigned int nhashmask)87 static void xfrm_hash_transfer(struct hlist_head *list,
88 struct hlist_head *ndsttable,
89 struct hlist_head *nsrctable,
90 struct hlist_head *nspitable,
91 struct hlist_head *nseqtable,
92 unsigned int nhashmask)
93 {
94 struct hlist_node *tmp;
95 struct xfrm_state *x;
96
97 hlist_for_each_entry_safe(x, tmp, list, bydst) {
98 unsigned int h;
99
100 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
101 x->props.reqid, x->props.family,
102 nhashmask);
103 hlist_add_head_rcu(&x->bydst, ndsttable + h);
104
105 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
106 x->props.family,
107 nhashmask);
108 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
109
110 if (x->id.spi) {
111 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
112 x->id.proto, x->props.family,
113 nhashmask);
114 hlist_add_head_rcu(&x->byspi, nspitable + h);
115 }
116
117 if (x->km.seq) {
118 h = __xfrm_seq_hash(x->km.seq, nhashmask);
119 hlist_add_head_rcu(&x->byseq, nseqtable + h);
120 }
121 }
122 }
123
xfrm_hash_new_size(unsigned int state_hmask)124 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
125 {
126 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
127 }
128
xfrm_hash_resize(struct work_struct * work)129 static void xfrm_hash_resize(struct work_struct *work)
130 {
131 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
132 struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
133 unsigned long nsize, osize;
134 unsigned int nhashmask, ohashmask;
135 int i;
136
137 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
138 ndst = xfrm_hash_alloc(nsize);
139 if (!ndst)
140 return;
141 nsrc = xfrm_hash_alloc(nsize);
142 if (!nsrc) {
143 xfrm_hash_free(ndst, nsize);
144 return;
145 }
146 nspi = xfrm_hash_alloc(nsize);
147 if (!nspi) {
148 xfrm_hash_free(ndst, nsize);
149 xfrm_hash_free(nsrc, nsize);
150 return;
151 }
152 nseq = xfrm_hash_alloc(nsize);
153 if (!nseq) {
154 xfrm_hash_free(ndst, nsize);
155 xfrm_hash_free(nsrc, nsize);
156 xfrm_hash_free(nspi, nsize);
157 return;
158 }
159
160 spin_lock_bh(&net->xfrm.xfrm_state_lock);
161 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
162
163 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
164 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
165 for (i = net->xfrm.state_hmask; i >= 0; i--)
166 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
167
168 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
169 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
170 oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
171 ohashmask = net->xfrm.state_hmask;
172
173 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
174 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
175 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
176 rcu_assign_pointer(net->xfrm.state_byseq, nseq);
177 net->xfrm.state_hmask = nhashmask;
178
179 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
180 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
181
182 osize = (ohashmask + 1) * sizeof(struct hlist_head);
183
184 synchronize_rcu();
185
186 xfrm_hash_free(odst, osize);
187 xfrm_hash_free(osrc, osize);
188 xfrm_hash_free(ospi, osize);
189 xfrm_hash_free(oseq, osize);
190 }
191
192 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
193 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
194
195 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
196
197 int __xfrm_state_delete(struct xfrm_state *x);
198
199 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
200 static bool km_is_alive(const struct km_event *c);
201 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
202
xfrm_register_type(const struct xfrm_type * type,unsigned short family)203 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
204 {
205 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
206 int err = 0;
207
208 if (!afinfo)
209 return -EAFNOSUPPORT;
210
211 #define X(afi, T, name) do { \
212 WARN_ON((afi)->type_ ## name); \
213 (afi)->type_ ## name = (T); \
214 } while (0)
215
216 switch (type->proto) {
217 case IPPROTO_COMP:
218 X(afinfo, type, comp);
219 break;
220 case IPPROTO_AH:
221 X(afinfo, type, ah);
222 break;
223 case IPPROTO_ESP:
224 X(afinfo, type, esp);
225 break;
226 case IPPROTO_IPIP:
227 X(afinfo, type, ipip);
228 break;
229 case IPPROTO_DSTOPTS:
230 X(afinfo, type, dstopts);
231 break;
232 case IPPROTO_ROUTING:
233 X(afinfo, type, routing);
234 break;
235 case IPPROTO_IPV6:
236 X(afinfo, type, ipip6);
237 break;
238 default:
239 WARN_ON(1);
240 err = -EPROTONOSUPPORT;
241 break;
242 }
243 #undef X
244 rcu_read_unlock();
245 return err;
246 }
247 EXPORT_SYMBOL(xfrm_register_type);
248
xfrm_unregister_type(const struct xfrm_type * type,unsigned short family)249 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
250 {
251 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
252
253 if (unlikely(afinfo == NULL))
254 return;
255
256 #define X(afi, T, name) do { \
257 WARN_ON((afi)->type_ ## name != (T)); \
258 (afi)->type_ ## name = NULL; \
259 } while (0)
260
261 switch (type->proto) {
262 case IPPROTO_COMP:
263 X(afinfo, type, comp);
264 break;
265 case IPPROTO_AH:
266 X(afinfo, type, ah);
267 break;
268 case IPPROTO_ESP:
269 X(afinfo, type, esp);
270 break;
271 case IPPROTO_IPIP:
272 X(afinfo, type, ipip);
273 break;
274 case IPPROTO_DSTOPTS:
275 X(afinfo, type, dstopts);
276 break;
277 case IPPROTO_ROUTING:
278 X(afinfo, type, routing);
279 break;
280 case IPPROTO_IPV6:
281 X(afinfo, type, ipip6);
282 break;
283 default:
284 WARN_ON(1);
285 break;
286 }
287 #undef X
288 rcu_read_unlock();
289 }
290 EXPORT_SYMBOL(xfrm_unregister_type);
291
xfrm_get_type(u8 proto,unsigned short family)292 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
293 {
294 const struct xfrm_type *type = NULL;
295 struct xfrm_state_afinfo *afinfo;
296 int modload_attempted = 0;
297
298 retry:
299 afinfo = xfrm_state_get_afinfo(family);
300 if (unlikely(afinfo == NULL))
301 return NULL;
302
303 switch (proto) {
304 case IPPROTO_COMP:
305 type = afinfo->type_comp;
306 break;
307 case IPPROTO_AH:
308 type = afinfo->type_ah;
309 break;
310 case IPPROTO_ESP:
311 type = afinfo->type_esp;
312 break;
313 case IPPROTO_IPIP:
314 type = afinfo->type_ipip;
315 break;
316 case IPPROTO_DSTOPTS:
317 type = afinfo->type_dstopts;
318 break;
319 case IPPROTO_ROUTING:
320 type = afinfo->type_routing;
321 break;
322 case IPPROTO_IPV6:
323 type = afinfo->type_ipip6;
324 break;
325 default:
326 break;
327 }
328
329 if (unlikely(type && !try_module_get(type->owner)))
330 type = NULL;
331
332 rcu_read_unlock();
333
334 if (!type && !modload_attempted) {
335 request_module("xfrm-type-%d-%d", family, proto);
336 modload_attempted = 1;
337 goto retry;
338 }
339
340 return type;
341 }
342
xfrm_put_type(const struct xfrm_type * type)343 static void xfrm_put_type(const struct xfrm_type *type)
344 {
345 module_put(type->owner);
346 }
347
xfrm_register_type_offload(const struct xfrm_type_offload * type,unsigned short family)348 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
349 unsigned short family)
350 {
351 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
352 int err = 0;
353
354 if (unlikely(afinfo == NULL))
355 return -EAFNOSUPPORT;
356
357 switch (type->proto) {
358 case IPPROTO_ESP:
359 WARN_ON(afinfo->type_offload_esp);
360 afinfo->type_offload_esp = type;
361 break;
362 default:
363 WARN_ON(1);
364 err = -EPROTONOSUPPORT;
365 break;
366 }
367
368 rcu_read_unlock();
369 return err;
370 }
371 EXPORT_SYMBOL(xfrm_register_type_offload);
372
xfrm_unregister_type_offload(const struct xfrm_type_offload * type,unsigned short family)373 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
374 unsigned short family)
375 {
376 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
377
378 if (unlikely(afinfo == NULL))
379 return;
380
381 switch (type->proto) {
382 case IPPROTO_ESP:
383 WARN_ON(afinfo->type_offload_esp != type);
384 afinfo->type_offload_esp = NULL;
385 break;
386 default:
387 WARN_ON(1);
388 break;
389 }
390 rcu_read_unlock();
391 }
392 EXPORT_SYMBOL(xfrm_unregister_type_offload);
393
394 static const struct xfrm_type_offload *
xfrm_get_type_offload(u8 proto,unsigned short family,bool try_load)395 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
396 {
397 const struct xfrm_type_offload *type = NULL;
398 struct xfrm_state_afinfo *afinfo;
399
400 retry:
401 afinfo = xfrm_state_get_afinfo(family);
402 if (unlikely(afinfo == NULL))
403 return NULL;
404
405 switch (proto) {
406 case IPPROTO_ESP:
407 type = afinfo->type_offload_esp;
408 break;
409 default:
410 break;
411 }
412
413 if ((type && !try_module_get(type->owner)))
414 type = NULL;
415
416 rcu_read_unlock();
417
418 if (!type && try_load) {
419 request_module("xfrm-offload-%d-%d", family, proto);
420 try_load = false;
421 goto retry;
422 }
423
424 return type;
425 }
426
xfrm_put_type_offload(const struct xfrm_type_offload * type)427 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
428 {
429 module_put(type->owner);
430 }
431
432 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
433 [XFRM_MODE_BEET] = {
434 .encap = XFRM_MODE_BEET,
435 .flags = XFRM_MODE_FLAG_TUNNEL,
436 .family = AF_INET,
437 },
438 [XFRM_MODE_TRANSPORT] = {
439 .encap = XFRM_MODE_TRANSPORT,
440 .family = AF_INET,
441 },
442 [XFRM_MODE_TUNNEL] = {
443 .encap = XFRM_MODE_TUNNEL,
444 .flags = XFRM_MODE_FLAG_TUNNEL,
445 .family = AF_INET,
446 },
447 };
448
449 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
450 [XFRM_MODE_BEET] = {
451 .encap = XFRM_MODE_BEET,
452 .flags = XFRM_MODE_FLAG_TUNNEL,
453 .family = AF_INET6,
454 },
455 [XFRM_MODE_ROUTEOPTIMIZATION] = {
456 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
457 .family = AF_INET6,
458 },
459 [XFRM_MODE_TRANSPORT] = {
460 .encap = XFRM_MODE_TRANSPORT,
461 .family = AF_INET6,
462 },
463 [XFRM_MODE_TUNNEL] = {
464 .encap = XFRM_MODE_TUNNEL,
465 .flags = XFRM_MODE_FLAG_TUNNEL,
466 .family = AF_INET6,
467 },
468 };
469
xfrm_get_mode(unsigned int encap,int family)470 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
471 {
472 const struct xfrm_mode *mode;
473
474 if (unlikely(encap >= XFRM_MODE_MAX))
475 return NULL;
476
477 switch (family) {
478 case AF_INET:
479 mode = &xfrm4_mode_map[encap];
480 if (mode->family == family)
481 return mode;
482 break;
483 case AF_INET6:
484 mode = &xfrm6_mode_map[encap];
485 if (mode->family == family)
486 return mode;
487 break;
488 default:
489 break;
490 }
491
492 return NULL;
493 }
494
xfrm_state_free(struct xfrm_state * x)495 void xfrm_state_free(struct xfrm_state *x)
496 {
497 kmem_cache_free(xfrm_state_cache, x);
498 }
499 EXPORT_SYMBOL(xfrm_state_free);
500
___xfrm_state_destroy(struct xfrm_state * x)501 static void ___xfrm_state_destroy(struct xfrm_state *x)
502 {
503 hrtimer_cancel(&x->mtimer);
504 del_timer_sync(&x->rtimer);
505 kfree(x->aead);
506 kfree(x->aalg);
507 kfree(x->ealg);
508 kfree(x->calg);
509 kfree(x->encap);
510 kfree(x->coaddr);
511 kfree(x->replay_esn);
512 kfree(x->preplay_esn);
513 if (x->type_offload)
514 xfrm_put_type_offload(x->type_offload);
515 if (x->type) {
516 x->type->destructor(x);
517 xfrm_put_type(x->type);
518 }
519 if (x->xfrag.page)
520 put_page(x->xfrag.page);
521 xfrm_dev_state_free(x);
522 security_xfrm_state_free(x);
523 xfrm_state_free(x);
524 }
525
xfrm_state_gc_task(struct work_struct * work)526 static void xfrm_state_gc_task(struct work_struct *work)
527 {
528 struct xfrm_state *x;
529 struct hlist_node *tmp;
530 struct hlist_head gc_list;
531
532 spin_lock_bh(&xfrm_state_gc_lock);
533 hlist_move_list(&xfrm_state_gc_list, &gc_list);
534 spin_unlock_bh(&xfrm_state_gc_lock);
535
536 synchronize_rcu();
537
538 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
539 ___xfrm_state_destroy(x);
540 }
541
xfrm_timer_handler(struct hrtimer * me)542 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
543 {
544 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
545 enum hrtimer_restart ret = HRTIMER_NORESTART;
546 time64_t now = ktime_get_real_seconds();
547 time64_t next = TIME64_MAX;
548 int warn = 0;
549 int err = 0;
550
551 spin_lock(&x->lock);
552 if (x->km.state == XFRM_STATE_DEAD)
553 goto out;
554 if (x->km.state == XFRM_STATE_EXPIRED)
555 goto expired;
556 if (x->lft.hard_add_expires_seconds) {
557 long tmo = x->lft.hard_add_expires_seconds +
558 x->curlft.add_time - now;
559 if (tmo <= 0) {
560 if (x->xflags & XFRM_SOFT_EXPIRE) {
561 /* enter hard expire without soft expire first?!
562 * setting a new date could trigger this.
563 * workaround: fix x->curflt.add_time by below:
564 */
565 x->curlft.add_time = now - x->saved_tmo - 1;
566 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
567 } else
568 goto expired;
569 }
570 if (tmo < next)
571 next = tmo;
572 }
573 if (x->lft.hard_use_expires_seconds) {
574 long tmo = x->lft.hard_use_expires_seconds +
575 (READ_ONCE(x->curlft.use_time) ? : now) - now;
576 if (tmo <= 0)
577 goto expired;
578 if (tmo < next)
579 next = tmo;
580 }
581 if (x->km.dying)
582 goto resched;
583 if (x->lft.soft_add_expires_seconds) {
584 long tmo = x->lft.soft_add_expires_seconds +
585 x->curlft.add_time - now;
586 if (tmo <= 0) {
587 warn = 1;
588 x->xflags &= ~XFRM_SOFT_EXPIRE;
589 } else if (tmo < next) {
590 next = tmo;
591 x->xflags |= XFRM_SOFT_EXPIRE;
592 x->saved_tmo = tmo;
593 }
594 }
595 if (x->lft.soft_use_expires_seconds) {
596 long tmo = x->lft.soft_use_expires_seconds +
597 (READ_ONCE(x->curlft.use_time) ? : now) - now;
598 if (tmo <= 0)
599 warn = 1;
600 else if (tmo < next)
601 next = tmo;
602 }
603
604 x->km.dying = warn;
605 if (warn)
606 km_state_expired(x, 0, 0);
607 resched:
608 if (next != TIME64_MAX) {
609 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
610 ret = HRTIMER_RESTART;
611 }
612
613 goto out;
614
615 expired:
616 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
617 x->km.state = XFRM_STATE_EXPIRED;
618
619 err = __xfrm_state_delete(x);
620 if (!err)
621 km_state_expired(x, 1, 0);
622
623 xfrm_audit_state_delete(x, err ? 0 : 1, true);
624
625 out:
626 spin_unlock(&x->lock);
627 return ret;
628 }
629
630 static void xfrm_replay_timer_handler(struct timer_list *t);
631
xfrm_state_alloc(struct net * net)632 struct xfrm_state *xfrm_state_alloc(struct net *net)
633 {
634 struct xfrm_state *x;
635
636 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
637
638 if (x) {
639 write_pnet(&x->xs_net, net);
640 refcount_set(&x->refcnt, 1);
641 atomic_set(&x->tunnel_users, 0);
642 INIT_LIST_HEAD(&x->km.all);
643 INIT_HLIST_NODE(&x->bydst);
644 INIT_HLIST_NODE(&x->bysrc);
645 INIT_HLIST_NODE(&x->byspi);
646 INIT_HLIST_NODE(&x->byseq);
647 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
648 x->mtimer.function = xfrm_timer_handler;
649 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
650 x->curlft.add_time = ktime_get_real_seconds();
651 x->lft.soft_byte_limit = XFRM_INF;
652 x->lft.soft_packet_limit = XFRM_INF;
653 x->lft.hard_byte_limit = XFRM_INF;
654 x->lft.hard_packet_limit = XFRM_INF;
655 x->replay_maxage = 0;
656 x->replay_maxdiff = 0;
657 spin_lock_init(&x->lock);
658 }
659 return x;
660 }
661 EXPORT_SYMBOL(xfrm_state_alloc);
662
__xfrm_state_destroy(struct xfrm_state * x,bool sync)663 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
664 {
665 WARN_ON(x->km.state != XFRM_STATE_DEAD);
666
667 if (sync) {
668 synchronize_rcu();
669 ___xfrm_state_destroy(x);
670 } else {
671 spin_lock_bh(&xfrm_state_gc_lock);
672 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
673 spin_unlock_bh(&xfrm_state_gc_lock);
674 schedule_work(&xfrm_state_gc_work);
675 }
676 }
677 EXPORT_SYMBOL(__xfrm_state_destroy);
678
__xfrm_state_delete(struct xfrm_state * x)679 int __xfrm_state_delete(struct xfrm_state *x)
680 {
681 struct net *net = xs_net(x);
682 int err = -ESRCH;
683
684 if (x->km.state != XFRM_STATE_DEAD) {
685 x->km.state = XFRM_STATE_DEAD;
686 spin_lock(&net->xfrm.xfrm_state_lock);
687 list_del(&x->km.all);
688 hlist_del_rcu(&x->bydst);
689 hlist_del_rcu(&x->bysrc);
690 if (x->km.seq)
691 hlist_del_rcu(&x->byseq);
692 if (x->id.spi)
693 hlist_del_rcu(&x->byspi);
694 net->xfrm.state_num--;
695 spin_unlock(&net->xfrm.xfrm_state_lock);
696
697 if (x->encap_sk)
698 sock_put(rcu_dereference_raw(x->encap_sk));
699
700 xfrm_dev_state_delete(x);
701
702 /* All xfrm_state objects are created by xfrm_state_alloc.
703 * The xfrm_state_alloc call gives a reference, and that
704 * is what we are dropping here.
705 */
706 xfrm_state_put(x);
707 err = 0;
708 }
709
710 return err;
711 }
712 EXPORT_SYMBOL(__xfrm_state_delete);
713
xfrm_state_delete(struct xfrm_state * x)714 int xfrm_state_delete(struct xfrm_state *x)
715 {
716 int err;
717
718 spin_lock_bh(&x->lock);
719 err = __xfrm_state_delete(x);
720 spin_unlock_bh(&x->lock);
721
722 return err;
723 }
724 EXPORT_SYMBOL(xfrm_state_delete);
725
726 #ifdef CONFIG_SECURITY_NETWORK_XFRM
727 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)728 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
729 {
730 int i, err = 0;
731
732 for (i = 0; i <= net->xfrm.state_hmask; i++) {
733 struct xfrm_state *x;
734
735 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
736 if (xfrm_id_proto_match(x->id.proto, proto) &&
737 (err = security_xfrm_state_delete(x)) != 0) {
738 xfrm_audit_state_delete(x, 0, task_valid);
739 return err;
740 }
741 }
742 }
743
744 return err;
745 }
746
747 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)748 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
749 {
750 int i, err = 0;
751
752 for (i = 0; i <= net->xfrm.state_hmask; i++) {
753 struct xfrm_state *x;
754 struct xfrm_dev_offload *xso;
755
756 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
757 xso = &x->xso;
758
759 if (xso->dev == dev &&
760 (err = security_xfrm_state_delete(x)) != 0) {
761 xfrm_audit_state_delete(x, 0, task_valid);
762 return err;
763 }
764 }
765 }
766
767 return err;
768 }
769 #else
770 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)771 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
772 {
773 return 0;
774 }
775
776 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)777 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
778 {
779 return 0;
780 }
781 #endif
782
xfrm_state_flush(struct net * net,u8 proto,bool task_valid,bool sync)783 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
784 {
785 int i, err = 0, cnt = 0;
786
787 spin_lock_bh(&net->xfrm.xfrm_state_lock);
788 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
789 if (err)
790 goto out;
791
792 err = -ESRCH;
793 for (i = 0; i <= net->xfrm.state_hmask; i++) {
794 struct xfrm_state *x;
795 restart:
796 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
797 if (!xfrm_state_kern(x) &&
798 xfrm_id_proto_match(x->id.proto, proto)) {
799 xfrm_state_hold(x);
800 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
801
802 err = xfrm_state_delete(x);
803 xfrm_audit_state_delete(x, err ? 0 : 1,
804 task_valid);
805 if (sync)
806 xfrm_state_put_sync(x);
807 else
808 xfrm_state_put(x);
809 if (!err)
810 cnt++;
811
812 spin_lock_bh(&net->xfrm.xfrm_state_lock);
813 goto restart;
814 }
815 }
816 }
817 out:
818 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
819 if (cnt)
820 err = 0;
821
822 return err;
823 }
824 EXPORT_SYMBOL(xfrm_state_flush);
825
xfrm_dev_state_flush(struct net * net,struct net_device * dev,bool task_valid)826 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
827 {
828 int i, err = 0, cnt = 0;
829
830 spin_lock_bh(&net->xfrm.xfrm_state_lock);
831 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
832 if (err)
833 goto out;
834
835 err = -ESRCH;
836 for (i = 0; i <= net->xfrm.state_hmask; i++) {
837 struct xfrm_state *x;
838 struct xfrm_dev_offload *xso;
839 restart:
840 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
841 xso = &x->xso;
842
843 if (!xfrm_state_kern(x) && xso->dev == dev) {
844 xfrm_state_hold(x);
845 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
846
847 err = xfrm_state_delete(x);
848 xfrm_audit_state_delete(x, err ? 0 : 1,
849 task_valid);
850 xfrm_state_put(x);
851 if (!err)
852 cnt++;
853
854 spin_lock_bh(&net->xfrm.xfrm_state_lock);
855 goto restart;
856 }
857 }
858 }
859 if (cnt)
860 err = 0;
861
862 out:
863 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
864 return err;
865 }
866 EXPORT_SYMBOL(xfrm_dev_state_flush);
867
xfrm_sad_getinfo(struct net * net,struct xfrmk_sadinfo * si)868 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
869 {
870 spin_lock_bh(&net->xfrm.xfrm_state_lock);
871 si->sadcnt = net->xfrm.state_num;
872 si->sadhcnt = net->xfrm.state_hmask + 1;
873 si->sadhmcnt = xfrm_state_hashmax;
874 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
875 }
876 EXPORT_SYMBOL(xfrm_sad_getinfo);
877
878 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)879 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
880 {
881 const struct flowi4 *fl4 = &fl->u.ip4;
882
883 sel->daddr.a4 = fl4->daddr;
884 sel->saddr.a4 = fl4->saddr;
885 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
886 sel->dport_mask = htons(0xffff);
887 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
888 sel->sport_mask = htons(0xffff);
889 sel->family = AF_INET;
890 sel->prefixlen_d = 32;
891 sel->prefixlen_s = 32;
892 sel->proto = fl4->flowi4_proto;
893 sel->ifindex = fl4->flowi4_oif;
894 }
895
896 static void
__xfrm6_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)897 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
898 {
899 const struct flowi6 *fl6 = &fl->u.ip6;
900
901 /* Initialize temporary selector matching only to current session. */
902 *(struct in6_addr *)&sel->daddr = fl6->daddr;
903 *(struct in6_addr *)&sel->saddr = fl6->saddr;
904 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
905 sel->dport_mask = htons(0xffff);
906 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
907 sel->sport_mask = htons(0xffff);
908 sel->family = AF_INET6;
909 sel->prefixlen_d = 128;
910 sel->prefixlen_s = 128;
911 sel->proto = fl6->flowi6_proto;
912 sel->ifindex = fl6->flowi6_oif;
913 }
914
915 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)916 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
917 const struct xfrm_tmpl *tmpl,
918 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
919 unsigned short family)
920 {
921 switch (family) {
922 case AF_INET:
923 __xfrm4_init_tempsel(&x->sel, fl);
924 break;
925 case AF_INET6:
926 __xfrm6_init_tempsel(&x->sel, fl);
927 break;
928 }
929
930 x->id = tmpl->id;
931
932 switch (tmpl->encap_family) {
933 case AF_INET:
934 if (x->id.daddr.a4 == 0)
935 x->id.daddr.a4 = daddr->a4;
936 x->props.saddr = tmpl->saddr;
937 if (x->props.saddr.a4 == 0)
938 x->props.saddr.a4 = saddr->a4;
939 break;
940 case AF_INET6:
941 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
942 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
943 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
944 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
945 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
946 break;
947 }
948
949 x->props.mode = tmpl->mode;
950 x->props.reqid = tmpl->reqid;
951 x->props.family = tmpl->encap_family;
952 }
953
__xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)954 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
955 const xfrm_address_t *daddr,
956 __be32 spi, u8 proto,
957 unsigned short family)
958 {
959 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
960 struct xfrm_state *x;
961
962 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
963 if (x->props.family != family ||
964 x->id.spi != spi ||
965 x->id.proto != proto ||
966 !xfrm_addr_equal(&x->id.daddr, daddr, 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
__xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)979 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
980 const xfrm_address_t *daddr,
981 const xfrm_address_t *saddr,
982 u8 proto, unsigned short family)
983 {
984 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
985 struct xfrm_state *x;
986
987 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
988 if (x->props.family != family ||
989 x->id.proto != proto ||
990 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
991 !xfrm_addr_equal(&x->props.saddr, saddr, family))
992 continue;
993
994 if ((mark & x->mark.m) != x->mark.v)
995 continue;
996 if (!xfrm_state_hold_rcu(x))
997 continue;
998 return x;
999 }
1000
1001 return NULL;
1002 }
1003
1004 static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state * x,int use_spi,int family)1005 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1006 {
1007 struct net *net = xs_net(x);
1008 u32 mark = x->mark.v & x->mark.m;
1009
1010 if (use_spi)
1011 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1012 x->id.spi, x->id.proto, family);
1013 else
1014 return __xfrm_state_lookup_byaddr(net, mark,
1015 &x->id.daddr,
1016 &x->props.saddr,
1017 x->id.proto, family);
1018 }
1019
xfrm_hash_grow_check(struct net * net,int have_hash_collision)1020 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
1021 {
1022 if (have_hash_collision &&
1023 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1024 net->xfrm.state_num > net->xfrm.state_hmask)
1025 schedule_work(&net->xfrm.state_hash_work);
1026 }
1027
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)1028 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1029 const struct flowi *fl, unsigned short family,
1030 struct xfrm_state **best, int *acq_in_progress,
1031 int *error)
1032 {
1033 /* Resolution logic:
1034 * 1. There is a valid state with matching selector. Done.
1035 * 2. Valid state with inappropriate selector. Skip.
1036 *
1037 * Entering area of "sysdeps".
1038 *
1039 * 3. If state is not valid, selector is temporary, it selects
1040 * only session which triggered previous resolution. Key
1041 * manager will do something to install a state with proper
1042 * selector.
1043 */
1044 if (x->km.state == XFRM_STATE_VALID) {
1045 if ((x->sel.family &&
1046 (x->sel.family != family ||
1047 !xfrm_selector_match(&x->sel, fl, family))) ||
1048 !security_xfrm_state_pol_flow_match(x, pol,
1049 &fl->u.__fl_common))
1050 return;
1051
1052 if (!*best ||
1053 (*best)->km.dying > x->km.dying ||
1054 ((*best)->km.dying == x->km.dying &&
1055 (*best)->curlft.add_time < x->curlft.add_time))
1056 *best = x;
1057 } else if (x->km.state == XFRM_STATE_ACQ) {
1058 *acq_in_progress = 1;
1059 } else if (x->km.state == XFRM_STATE_ERROR ||
1060 x->km.state == XFRM_STATE_EXPIRED) {
1061 if ((!x->sel.family ||
1062 (x->sel.family == family &&
1063 xfrm_selector_match(&x->sel, fl, family))) &&
1064 security_xfrm_state_pol_flow_match(x, pol,
1065 &fl->u.__fl_common))
1066 *error = -ESRCH;
1067 }
1068 }
1069
1070 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)1071 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1072 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1073 struct xfrm_policy *pol, int *err,
1074 unsigned short family, u32 if_id)
1075 {
1076 static xfrm_address_t saddr_wildcard = { };
1077 struct net *net = xp_net(pol);
1078 unsigned int h, h_wildcard;
1079 struct xfrm_state *x, *x0, *to_put;
1080 int acquire_in_progress = 0;
1081 int error = 0;
1082 struct xfrm_state *best = NULL;
1083 u32 mark = pol->mark.v & pol->mark.m;
1084 unsigned short encap_family = tmpl->encap_family;
1085 unsigned int sequence;
1086 struct km_event c;
1087
1088 to_put = NULL;
1089
1090 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1091
1092 rcu_read_lock();
1093 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1094 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1095 if (x->props.family == encap_family &&
1096 x->props.reqid == tmpl->reqid &&
1097 (mark & x->mark.m) == x->mark.v &&
1098 x->if_id == if_id &&
1099 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1100 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1101 tmpl->mode == x->props.mode &&
1102 tmpl->id.proto == x->id.proto &&
1103 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1104 xfrm_state_look_at(pol, x, fl, family,
1105 &best, &acquire_in_progress, &error);
1106 }
1107 if (best || acquire_in_progress)
1108 goto found;
1109
1110 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1111 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1112 if (x->props.family == encap_family &&
1113 x->props.reqid == tmpl->reqid &&
1114 (mark & x->mark.m) == x->mark.v &&
1115 x->if_id == if_id &&
1116 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1117 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1118 tmpl->mode == x->props.mode &&
1119 tmpl->id.proto == x->id.proto &&
1120 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1121 xfrm_state_look_at(pol, x, fl, family,
1122 &best, &acquire_in_progress, &error);
1123 }
1124
1125 found:
1126 x = best;
1127 if (!x && !error && !acquire_in_progress) {
1128 if (tmpl->id.spi &&
1129 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1130 tmpl->id.proto, encap_family)) != NULL) {
1131 to_put = x0;
1132 error = -EEXIST;
1133 goto out;
1134 }
1135
1136 c.net = net;
1137 /* If the KMs have no listeners (yet...), avoid allocating an SA
1138 * for each and every packet - garbage collection might not
1139 * handle the flood.
1140 */
1141 if (!km_is_alive(&c)) {
1142 error = -ESRCH;
1143 goto out;
1144 }
1145
1146 x = xfrm_state_alloc(net);
1147 if (x == NULL) {
1148 error = -ENOMEM;
1149 goto out;
1150 }
1151 /* Initialize temporary state matching only
1152 * to current session. */
1153 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1154 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1155 x->if_id = if_id;
1156
1157 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1158 if (error) {
1159 x->km.state = XFRM_STATE_DEAD;
1160 to_put = x;
1161 x = NULL;
1162 goto out;
1163 }
1164
1165 if (km_query(x, tmpl, pol) == 0) {
1166 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1167 x->km.state = XFRM_STATE_ACQ;
1168 list_add(&x->km.all, &net->xfrm.state_all);
1169 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1170 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1171 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1172 if (x->id.spi) {
1173 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1174 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1175 }
1176 if (x->km.seq) {
1177 h = xfrm_seq_hash(net, x->km.seq);
1178 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1179 }
1180 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1181 hrtimer_start(&x->mtimer,
1182 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1183 HRTIMER_MODE_REL_SOFT);
1184 net->xfrm.state_num++;
1185 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1186 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1187 } else {
1188 x->km.state = XFRM_STATE_DEAD;
1189 to_put = x;
1190 x = NULL;
1191 error = -ESRCH;
1192 }
1193 }
1194 out:
1195 if (x) {
1196 if (!xfrm_state_hold_rcu(x)) {
1197 *err = -EAGAIN;
1198 x = NULL;
1199 }
1200 } else {
1201 *err = acquire_in_progress ? -EAGAIN : error;
1202 }
1203 rcu_read_unlock();
1204 if (to_put)
1205 xfrm_state_put(to_put);
1206
1207 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1208 *err = -EAGAIN;
1209 if (x) {
1210 xfrm_state_put(x);
1211 x = NULL;
1212 }
1213 }
1214
1215 return x;
1216 }
1217
1218 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)1219 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1220 xfrm_address_t *daddr, xfrm_address_t *saddr,
1221 unsigned short family, u8 mode, u8 proto, u32 reqid)
1222 {
1223 unsigned int h;
1224 struct xfrm_state *rx = NULL, *x = NULL;
1225
1226 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1227 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1228 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1229 if (x->props.family == family &&
1230 x->props.reqid == reqid &&
1231 (mark & x->mark.m) == x->mark.v &&
1232 x->if_id == if_id &&
1233 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1234 xfrm_state_addr_check(x, daddr, saddr, family) &&
1235 mode == x->props.mode &&
1236 proto == x->id.proto &&
1237 x->km.state == XFRM_STATE_VALID) {
1238 rx = x;
1239 break;
1240 }
1241 }
1242
1243 if (rx)
1244 xfrm_state_hold(rx);
1245 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1246
1247
1248 return rx;
1249 }
1250 EXPORT_SYMBOL(xfrm_stateonly_find);
1251
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1252 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1253 unsigned short family)
1254 {
1255 struct xfrm_state *x;
1256 struct xfrm_state_walk *w;
1257
1258 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1259 list_for_each_entry(w, &net->xfrm.state_all, all) {
1260 x = container_of(w, struct xfrm_state, km);
1261 if (x->props.family != family ||
1262 x->id.spi != spi)
1263 continue;
1264
1265 xfrm_state_hold(x);
1266 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1267 return x;
1268 }
1269 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1270 return NULL;
1271 }
1272 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1273
__xfrm_state_insert(struct xfrm_state * x)1274 static void __xfrm_state_insert(struct xfrm_state *x)
1275 {
1276 struct net *net = xs_net(x);
1277 unsigned int h;
1278
1279 list_add(&x->km.all, &net->xfrm.state_all);
1280
1281 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1282 x->props.reqid, x->props.family);
1283 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1284
1285 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1286 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1287
1288 if (x->id.spi) {
1289 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1290 x->props.family);
1291
1292 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1293 }
1294
1295 if (x->km.seq) {
1296 h = xfrm_seq_hash(net, x->km.seq);
1297
1298 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1299 }
1300
1301 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1302 if (x->replay_maxage)
1303 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1304
1305 net->xfrm.state_num++;
1306
1307 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1308 }
1309
1310 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1311 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1312 {
1313 struct net *net = xs_net(xnew);
1314 unsigned short family = xnew->props.family;
1315 u32 reqid = xnew->props.reqid;
1316 struct xfrm_state *x;
1317 unsigned int h;
1318 u32 mark = xnew->mark.v & xnew->mark.m;
1319 u32 if_id = xnew->if_id;
1320
1321 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1322 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1323 if (x->props.family == family &&
1324 x->props.reqid == reqid &&
1325 x->if_id == if_id &&
1326 (mark & x->mark.m) == x->mark.v &&
1327 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1328 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1329 x->genid++;
1330 }
1331 }
1332
xfrm_state_insert(struct xfrm_state * x)1333 void xfrm_state_insert(struct xfrm_state *x)
1334 {
1335 struct net *net = xs_net(x);
1336
1337 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1338 __xfrm_state_bump_genids(x);
1339 __xfrm_state_insert(x);
1340 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1341 }
1342 EXPORT_SYMBOL(xfrm_state_insert);
1343
1344 /* 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)1345 static struct xfrm_state *__find_acq_core(struct net *net,
1346 const struct xfrm_mark *m,
1347 unsigned short family, u8 mode,
1348 u32 reqid, u32 if_id, u8 proto,
1349 const xfrm_address_t *daddr,
1350 const xfrm_address_t *saddr,
1351 int create)
1352 {
1353 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1354 struct xfrm_state *x;
1355 u32 mark = m->v & m->m;
1356
1357 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1358 if (x->props.reqid != reqid ||
1359 x->props.mode != mode ||
1360 x->props.family != family ||
1361 x->km.state != XFRM_STATE_ACQ ||
1362 x->id.spi != 0 ||
1363 x->id.proto != proto ||
1364 (mark & x->mark.m) != x->mark.v ||
1365 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1366 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1367 continue;
1368
1369 xfrm_state_hold(x);
1370 return x;
1371 }
1372
1373 if (!create)
1374 return NULL;
1375
1376 x = xfrm_state_alloc(net);
1377 if (likely(x)) {
1378 switch (family) {
1379 case AF_INET:
1380 x->sel.daddr.a4 = daddr->a4;
1381 x->sel.saddr.a4 = saddr->a4;
1382 x->sel.prefixlen_d = 32;
1383 x->sel.prefixlen_s = 32;
1384 x->props.saddr.a4 = saddr->a4;
1385 x->id.daddr.a4 = daddr->a4;
1386 break;
1387
1388 case AF_INET6:
1389 x->sel.daddr.in6 = daddr->in6;
1390 x->sel.saddr.in6 = saddr->in6;
1391 x->sel.prefixlen_d = 128;
1392 x->sel.prefixlen_s = 128;
1393 x->props.saddr.in6 = saddr->in6;
1394 x->id.daddr.in6 = daddr->in6;
1395 break;
1396 }
1397
1398 x->km.state = XFRM_STATE_ACQ;
1399 x->id.proto = proto;
1400 x->props.family = family;
1401 x->props.mode = mode;
1402 x->props.reqid = reqid;
1403 x->if_id = if_id;
1404 x->mark.v = m->v;
1405 x->mark.m = m->m;
1406 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1407 xfrm_state_hold(x);
1408 hrtimer_start(&x->mtimer,
1409 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1410 HRTIMER_MODE_REL_SOFT);
1411 list_add(&x->km.all, &net->xfrm.state_all);
1412 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1413 h = xfrm_src_hash(net, daddr, saddr, family);
1414 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1415
1416 net->xfrm.state_num++;
1417
1418 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1419 }
1420
1421 return x;
1422 }
1423
1424 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1425
xfrm_state_add(struct xfrm_state * x)1426 int xfrm_state_add(struct xfrm_state *x)
1427 {
1428 struct net *net = xs_net(x);
1429 struct xfrm_state *x1, *to_put;
1430 int family;
1431 int err;
1432 u32 mark = x->mark.v & x->mark.m;
1433 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1434
1435 family = x->props.family;
1436
1437 to_put = NULL;
1438
1439 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1440
1441 x1 = __xfrm_state_locate(x, use_spi, family);
1442 if (x1) {
1443 to_put = x1;
1444 x1 = NULL;
1445 err = -EEXIST;
1446 goto out;
1447 }
1448
1449 if (use_spi && x->km.seq) {
1450 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1451 if (x1 && ((x1->id.proto != x->id.proto) ||
1452 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1453 to_put = x1;
1454 x1 = NULL;
1455 }
1456 }
1457
1458 if (use_spi && !x1)
1459 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1460 x->props.reqid, x->if_id, x->id.proto,
1461 &x->id.daddr, &x->props.saddr, 0);
1462
1463 __xfrm_state_bump_genids(x);
1464 __xfrm_state_insert(x);
1465 err = 0;
1466
1467 out:
1468 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1469
1470 if (x1) {
1471 xfrm_state_delete(x1);
1472 xfrm_state_put(x1);
1473 }
1474
1475 if (to_put)
1476 xfrm_state_put(to_put);
1477
1478 return err;
1479 }
1480 EXPORT_SYMBOL(xfrm_state_add);
1481
1482 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1483 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1484 {
1485 struct xfrm_user_sec_ctx *uctx;
1486 int size = sizeof(*uctx) + security->ctx_len;
1487 int err;
1488
1489 uctx = kmalloc(size, GFP_KERNEL);
1490 if (!uctx)
1491 return -ENOMEM;
1492
1493 uctx->exttype = XFRMA_SEC_CTX;
1494 uctx->len = size;
1495 uctx->ctx_doi = security->ctx_doi;
1496 uctx->ctx_alg = security->ctx_alg;
1497 uctx->ctx_len = security->ctx_len;
1498 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1499 err = security_xfrm_state_alloc(x, uctx);
1500 kfree(uctx);
1501 if (err)
1502 return err;
1503
1504 return 0;
1505 }
1506
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1507 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1508 struct xfrm_encap_tmpl *encap)
1509 {
1510 struct net *net = xs_net(orig);
1511 struct xfrm_state *x = xfrm_state_alloc(net);
1512 if (!x)
1513 goto out;
1514
1515 memcpy(&x->id, &orig->id, sizeof(x->id));
1516 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1517 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1518 x->props.mode = orig->props.mode;
1519 x->props.replay_window = orig->props.replay_window;
1520 x->props.reqid = orig->props.reqid;
1521 x->props.family = orig->props.family;
1522 x->props.saddr = orig->props.saddr;
1523
1524 if (orig->aalg) {
1525 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1526 if (!x->aalg)
1527 goto error;
1528 }
1529 x->props.aalgo = orig->props.aalgo;
1530
1531 if (orig->aead) {
1532 x->aead = xfrm_algo_aead_clone(orig->aead);
1533 x->geniv = orig->geniv;
1534 if (!x->aead)
1535 goto error;
1536 }
1537 if (orig->ealg) {
1538 x->ealg = xfrm_algo_clone(orig->ealg);
1539 if (!x->ealg)
1540 goto error;
1541 }
1542 x->props.ealgo = orig->props.ealgo;
1543
1544 if (orig->calg) {
1545 x->calg = xfrm_algo_clone(orig->calg);
1546 if (!x->calg)
1547 goto error;
1548 }
1549 x->props.calgo = orig->props.calgo;
1550
1551 if (encap || orig->encap) {
1552 if (encap)
1553 x->encap = kmemdup(encap, sizeof(*x->encap),
1554 GFP_KERNEL);
1555 else
1556 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1557 GFP_KERNEL);
1558
1559 if (!x->encap)
1560 goto error;
1561 }
1562
1563 if (orig->security)
1564 if (clone_security(x, orig->security))
1565 goto error;
1566
1567 if (orig->coaddr) {
1568 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1569 GFP_KERNEL);
1570 if (!x->coaddr)
1571 goto error;
1572 }
1573
1574 if (orig->replay_esn) {
1575 if (xfrm_replay_clone(x, orig))
1576 goto error;
1577 }
1578
1579 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1580 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1581
1582 x->props.flags = orig->props.flags;
1583 x->props.extra_flags = orig->props.extra_flags;
1584
1585 x->if_id = orig->if_id;
1586 x->tfcpad = orig->tfcpad;
1587 x->replay_maxdiff = orig->replay_maxdiff;
1588 x->replay_maxage = orig->replay_maxage;
1589 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1590 x->km.state = orig->km.state;
1591 x->km.seq = orig->km.seq;
1592 x->replay = orig->replay;
1593 x->preplay = orig->preplay;
1594 x->mapping_maxage = orig->mapping_maxage;
1595 x->lastused = orig->lastused;
1596 x->new_mapping = 0;
1597 x->new_mapping_sport = 0;
1598
1599 return x;
1600
1601 error:
1602 xfrm_state_put(x);
1603 out:
1604 return NULL;
1605 }
1606
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1607 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1608 u32 if_id)
1609 {
1610 unsigned int h;
1611 struct xfrm_state *x = NULL;
1612
1613 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1614
1615 if (m->reqid) {
1616 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1617 m->reqid, m->old_family);
1618 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1619 if (x->props.mode != m->mode ||
1620 x->id.proto != m->proto)
1621 continue;
1622 if (m->reqid && x->props.reqid != m->reqid)
1623 continue;
1624 if (if_id != 0 && x->if_id != if_id)
1625 continue;
1626 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1627 m->old_family) ||
1628 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1629 m->old_family))
1630 continue;
1631 xfrm_state_hold(x);
1632 break;
1633 }
1634 } else {
1635 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1636 m->old_family);
1637 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1638 if (x->props.mode != m->mode ||
1639 x->id.proto != m->proto)
1640 continue;
1641 if (if_id != 0 && x->if_id != if_id)
1642 continue;
1643 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1644 m->old_family) ||
1645 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1646 m->old_family))
1647 continue;
1648 xfrm_state_hold(x);
1649 break;
1650 }
1651 }
1652
1653 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1654
1655 return x;
1656 }
1657 EXPORT_SYMBOL(xfrm_migrate_state_find);
1658
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1659 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1660 struct xfrm_migrate *m,
1661 struct xfrm_encap_tmpl *encap)
1662 {
1663 struct xfrm_state *xc;
1664
1665 xc = xfrm_state_clone(x, encap);
1666 if (!xc)
1667 return NULL;
1668
1669 xc->props.family = m->new_family;
1670
1671 if (xfrm_init_state(xc) < 0)
1672 goto error;
1673
1674 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1675 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1676
1677 /* add state */
1678 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1679 /* a care is needed when the destination address of the
1680 state is to be updated as it is a part of triplet */
1681 xfrm_state_insert(xc);
1682 } else {
1683 if (xfrm_state_add(xc) < 0)
1684 goto error;
1685 }
1686
1687 return xc;
1688 error:
1689 xfrm_state_put(xc);
1690 return NULL;
1691 }
1692 EXPORT_SYMBOL(xfrm_state_migrate);
1693 #endif
1694
xfrm_state_update(struct xfrm_state * x)1695 int xfrm_state_update(struct xfrm_state *x)
1696 {
1697 struct xfrm_state *x1, *to_put;
1698 int err;
1699 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1700 struct net *net = xs_net(x);
1701
1702 to_put = NULL;
1703
1704 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1705 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1706
1707 err = -ESRCH;
1708 if (!x1)
1709 goto out;
1710
1711 if (xfrm_state_kern(x1)) {
1712 to_put = x1;
1713 err = -EEXIST;
1714 goto out;
1715 }
1716
1717 if (x1->km.state == XFRM_STATE_ACQ) {
1718 __xfrm_state_insert(x);
1719 x = NULL;
1720 }
1721 err = 0;
1722
1723 out:
1724 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1725
1726 if (to_put)
1727 xfrm_state_put(to_put);
1728
1729 if (err)
1730 return err;
1731
1732 if (!x) {
1733 xfrm_state_delete(x1);
1734 xfrm_state_put(x1);
1735 return 0;
1736 }
1737
1738 err = -EINVAL;
1739 spin_lock_bh(&x1->lock);
1740 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1741 if (x->encap && x1->encap &&
1742 x->encap->encap_type == x1->encap->encap_type)
1743 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1744 else if (x->encap || x1->encap)
1745 goto fail;
1746
1747 if (x->coaddr && x1->coaddr) {
1748 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1749 }
1750 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1751 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1752 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1753 x1->km.dying = 0;
1754
1755 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1756 HRTIMER_MODE_REL_SOFT);
1757 if (READ_ONCE(x1->curlft.use_time))
1758 xfrm_state_check_expire(x1);
1759
1760 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1761 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1762
1763 if (x->props.smark.m || x->props.smark.v)
1764 x1->props.smark = x->props.smark;
1765
1766 if (x->if_id)
1767 x1->if_id = x->if_id;
1768
1769 __xfrm_state_bump_genids(x1);
1770 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1771 }
1772
1773 err = 0;
1774 x->km.state = XFRM_STATE_DEAD;
1775 __xfrm_state_put(x);
1776 }
1777
1778 fail:
1779 spin_unlock_bh(&x1->lock);
1780
1781 xfrm_state_put(x1);
1782
1783 return err;
1784 }
1785 EXPORT_SYMBOL(xfrm_state_update);
1786
xfrm_state_check_expire(struct xfrm_state * x)1787 int xfrm_state_check_expire(struct xfrm_state *x)
1788 {
1789 if (!READ_ONCE(x->curlft.use_time))
1790 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds());
1791
1792 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1793 x->curlft.packets >= x->lft.hard_packet_limit) {
1794 x->km.state = XFRM_STATE_EXPIRED;
1795 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1796 return -EINVAL;
1797 }
1798
1799 if (!x->km.dying &&
1800 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1801 x->curlft.packets >= x->lft.soft_packet_limit)) {
1802 x->km.dying = 1;
1803 km_state_expired(x, 0, 0);
1804 }
1805 return 0;
1806 }
1807 EXPORT_SYMBOL(xfrm_state_check_expire);
1808
1809 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1810 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1811 u8 proto, unsigned short family)
1812 {
1813 struct xfrm_state *x;
1814
1815 rcu_read_lock();
1816 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1817 rcu_read_unlock();
1818 return x;
1819 }
1820 EXPORT_SYMBOL(xfrm_state_lookup);
1821
1822 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)1823 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1824 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1825 u8 proto, unsigned short family)
1826 {
1827 struct xfrm_state *x;
1828
1829 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1830 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1831 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1832 return x;
1833 }
1834 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1835
1836 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)1837 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1838 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1839 const xfrm_address_t *saddr, int create, unsigned short family)
1840 {
1841 struct xfrm_state *x;
1842
1843 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1844 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1845 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1846
1847 return x;
1848 }
1849 EXPORT_SYMBOL(xfrm_find_acq);
1850
1851 #ifdef CONFIG_XFRM_SUB_POLICY
1852 #if IS_ENABLED(CONFIG_IPV6)
1853 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1854 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1855 __xfrm6_sort(void **dst, void **src, int n,
1856 int (*cmp)(const void *p), int maxclass)
1857 {
1858 int count[XFRM_MAX_DEPTH] = { };
1859 int class[XFRM_MAX_DEPTH];
1860 int i;
1861
1862 for (i = 0; i < n; i++) {
1863 int c = cmp(src[i]);
1864
1865 class[i] = c;
1866 count[c]++;
1867 }
1868
1869 for (i = 2; i < maxclass; i++)
1870 count[i] += count[i - 1];
1871
1872 for (i = 0; i < n; i++) {
1873 dst[count[class[i] - 1]++] = src[i];
1874 src[i] = NULL;
1875 }
1876 }
1877
1878 /* Rule for xfrm_state:
1879 *
1880 * rule 1: select IPsec transport except AH
1881 * rule 2: select MIPv6 RO or inbound trigger
1882 * rule 3: select IPsec transport AH
1883 * rule 4: select IPsec tunnel
1884 * rule 5: others
1885 */
__xfrm6_state_sort_cmp(const void * p)1886 static int __xfrm6_state_sort_cmp(const void *p)
1887 {
1888 const struct xfrm_state *v = p;
1889
1890 switch (v->props.mode) {
1891 case XFRM_MODE_TRANSPORT:
1892 if (v->id.proto != IPPROTO_AH)
1893 return 1;
1894 else
1895 return 3;
1896 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1897 case XFRM_MODE_ROUTEOPTIMIZATION:
1898 case XFRM_MODE_IN_TRIGGER:
1899 return 2;
1900 #endif
1901 case XFRM_MODE_TUNNEL:
1902 case XFRM_MODE_BEET:
1903 return 4;
1904 }
1905 return 5;
1906 }
1907
1908 /* Rule for xfrm_tmpl:
1909 *
1910 * rule 1: select IPsec transport
1911 * rule 2: select MIPv6 RO or inbound trigger
1912 * rule 3: select IPsec tunnel
1913 * rule 4: others
1914 */
__xfrm6_tmpl_sort_cmp(const void * p)1915 static int __xfrm6_tmpl_sort_cmp(const void *p)
1916 {
1917 const struct xfrm_tmpl *v = p;
1918
1919 switch (v->mode) {
1920 case XFRM_MODE_TRANSPORT:
1921 return 1;
1922 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1923 case XFRM_MODE_ROUTEOPTIMIZATION:
1924 case XFRM_MODE_IN_TRIGGER:
1925 return 2;
1926 #endif
1927 case XFRM_MODE_TUNNEL:
1928 case XFRM_MODE_BEET:
1929 return 3;
1930 }
1931 return 4;
1932 }
1933 #else
__xfrm6_state_sort_cmp(const void * p)1934 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)1935 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1936
1937 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)1938 __xfrm6_sort(void **dst, void **src, int n,
1939 int (*cmp)(const void *p), int maxclass)
1940 {
1941 int i;
1942
1943 for (i = 0; i < n; i++)
1944 dst[i] = src[i];
1945 }
1946 #endif /* CONFIG_IPV6 */
1947
1948 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)1949 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1950 unsigned short family)
1951 {
1952 int i;
1953
1954 if (family == AF_INET6)
1955 __xfrm6_sort((void **)dst, (void **)src, n,
1956 __xfrm6_tmpl_sort_cmp, 5);
1957 else
1958 for (i = 0; i < n; i++)
1959 dst[i] = src[i];
1960 }
1961
1962 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)1963 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1964 unsigned short family)
1965 {
1966 int i;
1967
1968 if (family == AF_INET6)
1969 __xfrm6_sort((void **)dst, (void **)src, n,
1970 __xfrm6_state_sort_cmp, 6);
1971 else
1972 for (i = 0; i < n; i++)
1973 dst[i] = src[i];
1974 }
1975 #endif
1976
1977 /* Silly enough, but I'm lazy to build resolution list */
1978
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1979 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1980 {
1981 unsigned int h = xfrm_seq_hash(net, seq);
1982 struct xfrm_state *x;
1983
1984 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
1985 if (x->km.seq == seq &&
1986 (mark & x->mark.m) == x->mark.v &&
1987 x->km.state == XFRM_STATE_ACQ) {
1988 xfrm_state_hold(x);
1989 return x;
1990 }
1991 }
1992
1993 return NULL;
1994 }
1995
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)1996 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1997 {
1998 struct xfrm_state *x;
1999
2000 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2001 x = __xfrm_find_acq_byseq(net, mark, seq);
2002 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2003 return x;
2004 }
2005 EXPORT_SYMBOL(xfrm_find_acq_byseq);
2006
xfrm_get_acqseq(void)2007 u32 xfrm_get_acqseq(void)
2008 {
2009 u32 res;
2010 static atomic_t acqseq;
2011
2012 do {
2013 res = atomic_inc_return(&acqseq);
2014 } while (!res);
2015
2016 return res;
2017 }
2018 EXPORT_SYMBOL(xfrm_get_acqseq);
2019
verify_spi_info(u8 proto,u32 min,u32 max)2020 int verify_spi_info(u8 proto, u32 min, u32 max)
2021 {
2022 switch (proto) {
2023 case IPPROTO_AH:
2024 case IPPROTO_ESP:
2025 break;
2026
2027 case IPPROTO_COMP:
2028 /* IPCOMP spi is 16-bits. */
2029 if (max >= 0x10000)
2030 return -EINVAL;
2031 break;
2032
2033 default:
2034 return -EINVAL;
2035 }
2036
2037 if (min > max)
2038 return -EINVAL;
2039
2040 return 0;
2041 }
2042 EXPORT_SYMBOL(verify_spi_info);
2043
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high)2044 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2045 {
2046 struct net *net = xs_net(x);
2047 unsigned int h;
2048 struct xfrm_state *x0;
2049 int err = -ENOENT;
2050 __be32 minspi = htonl(low);
2051 __be32 maxspi = htonl(high);
2052 __be32 newspi = 0;
2053 u32 mark = x->mark.v & x->mark.m;
2054
2055 spin_lock_bh(&x->lock);
2056 if (x->km.state == XFRM_STATE_DEAD)
2057 goto unlock;
2058
2059 err = 0;
2060 if (x->id.spi)
2061 goto unlock;
2062
2063 err = -ENOENT;
2064
2065 if (minspi == maxspi) {
2066 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2067 if (x0) {
2068 xfrm_state_put(x0);
2069 goto unlock;
2070 }
2071 newspi = minspi;
2072 } else {
2073 u32 spi = 0;
2074 for (h = 0; h < high-low+1; h++) {
2075 spi = low + prandom_u32_max(high - low + 1);
2076 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2077 if (x0 == NULL) {
2078 newspi = htonl(spi);
2079 break;
2080 }
2081 xfrm_state_put(x0);
2082 }
2083 }
2084 if (newspi) {
2085 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2086 x->id.spi = newspi;
2087 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2088 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2089 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2090
2091 err = 0;
2092 }
2093
2094 unlock:
2095 spin_unlock_bh(&x->lock);
2096
2097 return err;
2098 }
2099 EXPORT_SYMBOL(xfrm_alloc_spi);
2100
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2101 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2102 struct xfrm_address_filter *filter)
2103 {
2104 if (filter) {
2105 if ((filter->family == AF_INET ||
2106 filter->family == AF_INET6) &&
2107 x->props.family != filter->family)
2108 return false;
2109
2110 return addr_match(&x->props.saddr, &filter->saddr,
2111 filter->splen) &&
2112 addr_match(&x->id.daddr, &filter->daddr,
2113 filter->dplen);
2114 }
2115 return true;
2116 }
2117
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2118 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2119 int (*func)(struct xfrm_state *, int, void*),
2120 void *data)
2121 {
2122 struct xfrm_state *state;
2123 struct xfrm_state_walk *x;
2124 int err = 0;
2125
2126 if (walk->seq != 0 && list_empty(&walk->all))
2127 return 0;
2128
2129 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2130 if (list_empty(&walk->all))
2131 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2132 else
2133 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2134 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2135 if (x->state == XFRM_STATE_DEAD)
2136 continue;
2137 state = container_of(x, struct xfrm_state, km);
2138 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2139 continue;
2140 if (!__xfrm_state_filter_match(state, walk->filter))
2141 continue;
2142 err = func(state, walk->seq, data);
2143 if (err) {
2144 list_move_tail(&walk->all, &x->all);
2145 goto out;
2146 }
2147 walk->seq++;
2148 }
2149 if (walk->seq == 0) {
2150 err = -ENOENT;
2151 goto out;
2152 }
2153 list_del_init(&walk->all);
2154 out:
2155 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2156 return err;
2157 }
2158 EXPORT_SYMBOL(xfrm_state_walk);
2159
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2160 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2161 struct xfrm_address_filter *filter)
2162 {
2163 INIT_LIST_HEAD(&walk->all);
2164 walk->proto = proto;
2165 walk->state = XFRM_STATE_DEAD;
2166 walk->seq = 0;
2167 walk->filter = filter;
2168 }
2169 EXPORT_SYMBOL(xfrm_state_walk_init);
2170
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2171 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2172 {
2173 kfree(walk->filter);
2174
2175 if (list_empty(&walk->all))
2176 return;
2177
2178 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2179 list_del(&walk->all);
2180 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2181 }
2182 EXPORT_SYMBOL(xfrm_state_walk_done);
2183
xfrm_replay_timer_handler(struct timer_list * t)2184 static void xfrm_replay_timer_handler(struct timer_list *t)
2185 {
2186 struct xfrm_state *x = from_timer(x, t, rtimer);
2187
2188 spin_lock(&x->lock);
2189
2190 if (x->km.state == XFRM_STATE_VALID) {
2191 if (xfrm_aevent_is_on(xs_net(x)))
2192 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2193 else
2194 x->xflags |= XFRM_TIME_DEFER;
2195 }
2196
2197 spin_unlock(&x->lock);
2198 }
2199
2200 static LIST_HEAD(xfrm_km_list);
2201
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2202 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2203 {
2204 struct xfrm_mgr *km;
2205
2206 rcu_read_lock();
2207 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2208 if (km->notify_policy)
2209 km->notify_policy(xp, dir, c);
2210 rcu_read_unlock();
2211 }
2212
km_state_notify(struct xfrm_state * x,const struct km_event * c)2213 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2214 {
2215 struct xfrm_mgr *km;
2216 rcu_read_lock();
2217 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2218 if (km->notify)
2219 km->notify(x, c);
2220 rcu_read_unlock();
2221 }
2222
2223 EXPORT_SYMBOL(km_policy_notify);
2224 EXPORT_SYMBOL(km_state_notify);
2225
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2226 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2227 {
2228 struct km_event c;
2229
2230 c.data.hard = hard;
2231 c.portid = portid;
2232 c.event = XFRM_MSG_EXPIRE;
2233 km_state_notify(x, &c);
2234 }
2235
2236 EXPORT_SYMBOL(km_state_expired);
2237 /*
2238 * We send to all registered managers regardless of failure
2239 * We are happy with one success
2240 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2241 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2242 {
2243 int err = -EINVAL, acqret;
2244 struct xfrm_mgr *km;
2245
2246 rcu_read_lock();
2247 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2248 acqret = km->acquire(x, t, pol);
2249 if (!acqret)
2250 err = acqret;
2251 }
2252 rcu_read_unlock();
2253 return err;
2254 }
2255 EXPORT_SYMBOL(km_query);
2256
__km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2257 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2258 {
2259 int err = -EINVAL;
2260 struct xfrm_mgr *km;
2261
2262 rcu_read_lock();
2263 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2264 if (km->new_mapping)
2265 err = km->new_mapping(x, ipaddr, sport);
2266 if (!err)
2267 break;
2268 }
2269 rcu_read_unlock();
2270 return err;
2271 }
2272
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2273 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2274 {
2275 int ret = 0;
2276
2277 if (x->mapping_maxage) {
2278 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2279 x->new_mapping_sport != sport) {
2280 x->new_mapping_sport = sport;
2281 x->new_mapping = jiffies / HZ;
2282 ret = __km_new_mapping(x, ipaddr, sport);
2283 }
2284 } else {
2285 ret = __km_new_mapping(x, ipaddr, sport);
2286 }
2287
2288 return ret;
2289 }
2290 EXPORT_SYMBOL(km_new_mapping);
2291
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2292 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2293 {
2294 struct km_event c;
2295
2296 c.data.hard = hard;
2297 c.portid = portid;
2298 c.event = XFRM_MSG_POLEXPIRE;
2299 km_policy_notify(pol, dir, &c);
2300 }
2301 EXPORT_SYMBOL(km_policy_expired);
2302
2303 #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)2304 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2305 const struct xfrm_migrate *m, int num_migrate,
2306 const struct xfrm_kmaddress *k,
2307 const struct xfrm_encap_tmpl *encap)
2308 {
2309 int err = -EINVAL;
2310 int ret;
2311 struct xfrm_mgr *km;
2312
2313 rcu_read_lock();
2314 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2315 if (km->migrate) {
2316 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2317 encap);
2318 if (!ret)
2319 err = ret;
2320 }
2321 }
2322 rcu_read_unlock();
2323 return err;
2324 }
2325 EXPORT_SYMBOL(km_migrate);
2326 #endif
2327
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2328 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2329 {
2330 int err = -EINVAL;
2331 int ret;
2332 struct xfrm_mgr *km;
2333
2334 rcu_read_lock();
2335 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2336 if (km->report) {
2337 ret = km->report(net, proto, sel, addr);
2338 if (!ret)
2339 err = ret;
2340 }
2341 }
2342 rcu_read_unlock();
2343 return err;
2344 }
2345 EXPORT_SYMBOL(km_report);
2346
km_is_alive(const struct km_event * c)2347 static bool km_is_alive(const struct km_event *c)
2348 {
2349 struct xfrm_mgr *km;
2350 bool is_alive = false;
2351
2352 rcu_read_lock();
2353 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2354 if (km->is_alive && km->is_alive(c)) {
2355 is_alive = true;
2356 break;
2357 }
2358 }
2359 rcu_read_unlock();
2360
2361 return is_alive;
2362 }
2363
2364 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2365 static DEFINE_SPINLOCK(xfrm_translator_lock);
2366 static struct xfrm_translator __rcu *xfrm_translator;
2367
xfrm_get_translator(void)2368 struct xfrm_translator *xfrm_get_translator(void)
2369 {
2370 struct xfrm_translator *xtr;
2371
2372 rcu_read_lock();
2373 xtr = rcu_dereference(xfrm_translator);
2374 if (unlikely(!xtr))
2375 goto out;
2376 if (!try_module_get(xtr->owner))
2377 xtr = NULL;
2378 out:
2379 rcu_read_unlock();
2380 return xtr;
2381 }
2382 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2383
xfrm_put_translator(struct xfrm_translator * xtr)2384 void xfrm_put_translator(struct xfrm_translator *xtr)
2385 {
2386 module_put(xtr->owner);
2387 }
2388 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2389
xfrm_register_translator(struct xfrm_translator * xtr)2390 int xfrm_register_translator(struct xfrm_translator *xtr)
2391 {
2392 int err = 0;
2393
2394 spin_lock_bh(&xfrm_translator_lock);
2395 if (unlikely(xfrm_translator != NULL))
2396 err = -EEXIST;
2397 else
2398 rcu_assign_pointer(xfrm_translator, xtr);
2399 spin_unlock_bh(&xfrm_translator_lock);
2400
2401 return err;
2402 }
2403 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2404
xfrm_unregister_translator(struct xfrm_translator * xtr)2405 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2406 {
2407 int err = 0;
2408
2409 spin_lock_bh(&xfrm_translator_lock);
2410 if (likely(xfrm_translator != NULL)) {
2411 if (rcu_access_pointer(xfrm_translator) != xtr)
2412 err = -EINVAL;
2413 else
2414 RCU_INIT_POINTER(xfrm_translator, NULL);
2415 }
2416 spin_unlock_bh(&xfrm_translator_lock);
2417 synchronize_rcu();
2418
2419 return err;
2420 }
2421 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2422 #endif
2423
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2424 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2425 {
2426 int err;
2427 u8 *data;
2428 struct xfrm_mgr *km;
2429 struct xfrm_policy *pol = NULL;
2430
2431 if (sockptr_is_null(optval) && !optlen) {
2432 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2433 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2434 __sk_dst_reset(sk);
2435 return 0;
2436 }
2437
2438 if (optlen <= 0 || optlen > PAGE_SIZE)
2439 return -EMSGSIZE;
2440
2441 data = memdup_sockptr(optval, optlen);
2442 if (IS_ERR(data))
2443 return PTR_ERR(data);
2444
2445 /* Use the 64-bit / untranslated format on Android, even for compat */
2446 if (!IS_ENABLED(CONFIG_GKI_NET_XFRM_HACKS) || IS_ENABLED(CONFIG_XFRM_USER_COMPAT)) {
2447 if (in_compat_syscall()) {
2448 struct xfrm_translator *xtr = xfrm_get_translator();
2449
2450 if (!xtr) {
2451 kfree(data);
2452 return -EOPNOTSUPP;
2453 }
2454
2455 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2456 xfrm_put_translator(xtr);
2457 if (err) {
2458 kfree(data);
2459 return err;
2460 }
2461 }
2462 }
2463
2464 err = -EINVAL;
2465 rcu_read_lock();
2466 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2467 pol = km->compile_policy(sk, optname, data,
2468 optlen, &err);
2469 if (err >= 0)
2470 break;
2471 }
2472 rcu_read_unlock();
2473
2474 if (err >= 0) {
2475 xfrm_sk_policy_insert(sk, err, pol);
2476 xfrm_pol_put(pol);
2477 __sk_dst_reset(sk);
2478 err = 0;
2479 }
2480
2481 kfree(data);
2482 return err;
2483 }
2484 EXPORT_SYMBOL(xfrm_user_policy);
2485
2486 static DEFINE_SPINLOCK(xfrm_km_lock);
2487
xfrm_register_km(struct xfrm_mgr * km)2488 void xfrm_register_km(struct xfrm_mgr *km)
2489 {
2490 spin_lock_bh(&xfrm_km_lock);
2491 list_add_tail_rcu(&km->list, &xfrm_km_list);
2492 spin_unlock_bh(&xfrm_km_lock);
2493 }
2494 EXPORT_SYMBOL(xfrm_register_km);
2495
xfrm_unregister_km(struct xfrm_mgr * km)2496 void xfrm_unregister_km(struct xfrm_mgr *km)
2497 {
2498 spin_lock_bh(&xfrm_km_lock);
2499 list_del_rcu(&km->list);
2500 spin_unlock_bh(&xfrm_km_lock);
2501 synchronize_rcu();
2502 }
2503 EXPORT_SYMBOL(xfrm_unregister_km);
2504
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2505 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2506 {
2507 int err = 0;
2508
2509 if (WARN_ON(afinfo->family >= NPROTO))
2510 return -EAFNOSUPPORT;
2511
2512 spin_lock_bh(&xfrm_state_afinfo_lock);
2513 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2514 err = -EEXIST;
2515 else
2516 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2517 spin_unlock_bh(&xfrm_state_afinfo_lock);
2518 return err;
2519 }
2520 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2521
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2522 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2523 {
2524 int err = 0, family = afinfo->family;
2525
2526 if (WARN_ON(family >= NPROTO))
2527 return -EAFNOSUPPORT;
2528
2529 spin_lock_bh(&xfrm_state_afinfo_lock);
2530 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2531 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2532 err = -EINVAL;
2533 else
2534 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2535 }
2536 spin_unlock_bh(&xfrm_state_afinfo_lock);
2537 synchronize_rcu();
2538 return err;
2539 }
2540 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2541
xfrm_state_afinfo_get_rcu(unsigned int family)2542 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2543 {
2544 if (unlikely(family >= NPROTO))
2545 return NULL;
2546
2547 return rcu_dereference(xfrm_state_afinfo[family]);
2548 }
2549 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2550
xfrm_state_get_afinfo(unsigned int family)2551 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2552 {
2553 struct xfrm_state_afinfo *afinfo;
2554 if (unlikely(family >= NPROTO))
2555 return NULL;
2556 rcu_read_lock();
2557 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2558 if (unlikely(!afinfo))
2559 rcu_read_unlock();
2560 return afinfo;
2561 }
2562
xfrm_flush_gc(void)2563 void xfrm_flush_gc(void)
2564 {
2565 flush_work(&xfrm_state_gc_work);
2566 }
2567 EXPORT_SYMBOL(xfrm_flush_gc);
2568
2569 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2570 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2571 {
2572 if (x->tunnel) {
2573 struct xfrm_state *t = x->tunnel;
2574
2575 if (atomic_read(&t->tunnel_users) == 2)
2576 xfrm_state_delete(t);
2577 atomic_dec(&t->tunnel_users);
2578 xfrm_state_put_sync(t);
2579 x->tunnel = NULL;
2580 }
2581 }
2582 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2583
xfrm_state_mtu(struct xfrm_state * x,int mtu)2584 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2585 {
2586 const struct xfrm_type *type = READ_ONCE(x->type);
2587 struct crypto_aead *aead;
2588 u32 blksize, net_adj = 0;
2589
2590 if (x->km.state != XFRM_STATE_VALID ||
2591 !type || type->proto != IPPROTO_ESP)
2592 return mtu - x->props.header_len;
2593
2594 aead = x->data;
2595 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2596
2597 switch (x->props.mode) {
2598 case XFRM_MODE_TRANSPORT:
2599 case XFRM_MODE_BEET:
2600 if (x->props.family == AF_INET)
2601 net_adj = sizeof(struct iphdr);
2602 else if (x->props.family == AF_INET6)
2603 net_adj = sizeof(struct ipv6hdr);
2604 break;
2605 case XFRM_MODE_TUNNEL:
2606 break;
2607 default:
2608 WARN_ON_ONCE(1);
2609 break;
2610 }
2611
2612 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2613 net_adj) & ~(blksize - 1)) + net_adj - 2;
2614 }
2615 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2616
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload,struct netlink_ext_ack * extack)2617 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2618 struct netlink_ext_ack *extack)
2619 {
2620 const struct xfrm_mode *inner_mode;
2621 const struct xfrm_mode *outer_mode;
2622 int family = x->props.family;
2623 int err;
2624
2625 if (family == AF_INET &&
2626 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2627 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2628
2629 err = -EPROTONOSUPPORT;
2630
2631 if (x->sel.family != AF_UNSPEC) {
2632 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2633 if (inner_mode == NULL) {
2634 NL_SET_ERR_MSG(extack, "Requested mode not found");
2635 goto error;
2636 }
2637
2638 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2639 family != x->sel.family) {
2640 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
2641 goto error;
2642 }
2643
2644 x->inner_mode = *inner_mode;
2645 } else {
2646 const struct xfrm_mode *inner_mode_iaf;
2647 int iafamily = AF_INET;
2648
2649 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2650 if (inner_mode == NULL) {
2651 NL_SET_ERR_MSG(extack, "Requested mode not found");
2652 goto error;
2653 }
2654
2655 x->inner_mode = *inner_mode;
2656
2657 if (x->props.family == AF_INET)
2658 iafamily = AF_INET6;
2659
2660 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2661 if (inner_mode_iaf) {
2662 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2663 x->inner_mode_iaf = *inner_mode_iaf;
2664 }
2665 }
2666
2667 x->type = xfrm_get_type(x->id.proto, family);
2668 if (x->type == NULL) {
2669 NL_SET_ERR_MSG(extack, "Requested type not found");
2670 goto error;
2671 }
2672
2673 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2674
2675 err = x->type->init_state(x, extack);
2676 if (err)
2677 goto error;
2678
2679 outer_mode = xfrm_get_mode(x->props.mode, family);
2680 if (!outer_mode) {
2681 NL_SET_ERR_MSG(extack, "Requested mode not found");
2682 err = -EPROTONOSUPPORT;
2683 goto error;
2684 }
2685
2686 x->outer_mode = *outer_mode;
2687 if (init_replay) {
2688 err = xfrm_init_replay(x, extack);
2689 if (err)
2690 goto error;
2691 }
2692
2693 error:
2694 return err;
2695 }
2696
2697 EXPORT_SYMBOL(__xfrm_init_state);
2698
xfrm_init_state(struct xfrm_state * x)2699 int xfrm_init_state(struct xfrm_state *x)
2700 {
2701 int err;
2702
2703 err = __xfrm_init_state(x, true, false, NULL);
2704 if (!err)
2705 x->km.state = XFRM_STATE_VALID;
2706
2707 return err;
2708 }
2709
2710 EXPORT_SYMBOL(xfrm_init_state);
2711
xfrm_state_init(struct net * net)2712 int __net_init xfrm_state_init(struct net *net)
2713 {
2714 unsigned int sz;
2715
2716 if (net_eq(net, &init_net))
2717 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2718 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2719
2720 INIT_LIST_HEAD(&net->xfrm.state_all);
2721
2722 sz = sizeof(struct hlist_head) * 8;
2723
2724 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2725 if (!net->xfrm.state_bydst)
2726 goto out_bydst;
2727 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2728 if (!net->xfrm.state_bysrc)
2729 goto out_bysrc;
2730 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2731 if (!net->xfrm.state_byspi)
2732 goto out_byspi;
2733 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2734 if (!net->xfrm.state_byseq)
2735 goto out_byseq;
2736 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2737
2738 net->xfrm.state_num = 0;
2739 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2740 spin_lock_init(&net->xfrm.xfrm_state_lock);
2741 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2742 &net->xfrm.xfrm_state_lock);
2743 return 0;
2744
2745 out_byseq:
2746 xfrm_hash_free(net->xfrm.state_byspi, sz);
2747 out_byspi:
2748 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2749 out_bysrc:
2750 xfrm_hash_free(net->xfrm.state_bydst, sz);
2751 out_bydst:
2752 return -ENOMEM;
2753 }
2754
xfrm_state_fini(struct net * net)2755 void xfrm_state_fini(struct net *net)
2756 {
2757 unsigned int sz;
2758
2759 flush_work(&net->xfrm.state_hash_work);
2760 flush_work(&xfrm_state_gc_work);
2761 xfrm_state_flush(net, 0, false, true);
2762
2763 WARN_ON(!list_empty(&net->xfrm.state_all));
2764
2765 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2766 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2767 xfrm_hash_free(net->xfrm.state_byseq, sz);
2768 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2769 xfrm_hash_free(net->xfrm.state_byspi, sz);
2770 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2771 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2772 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2773 xfrm_hash_free(net->xfrm.state_bydst, sz);
2774 }
2775
2776 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2777 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2778 struct audit_buffer *audit_buf)
2779 {
2780 struct xfrm_sec_ctx *ctx = x->security;
2781 u32 spi = ntohl(x->id.spi);
2782
2783 if (ctx)
2784 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2785 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2786
2787 switch (x->props.family) {
2788 case AF_INET:
2789 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2790 &x->props.saddr.a4, &x->id.daddr.a4);
2791 break;
2792 case AF_INET6:
2793 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2794 x->props.saddr.a6, x->id.daddr.a6);
2795 break;
2796 }
2797
2798 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2799 }
2800
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2801 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2802 struct audit_buffer *audit_buf)
2803 {
2804 const struct iphdr *iph4;
2805 const struct ipv6hdr *iph6;
2806
2807 switch (family) {
2808 case AF_INET:
2809 iph4 = ip_hdr(skb);
2810 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2811 &iph4->saddr, &iph4->daddr);
2812 break;
2813 case AF_INET6:
2814 iph6 = ipv6_hdr(skb);
2815 audit_log_format(audit_buf,
2816 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2817 &iph6->saddr, &iph6->daddr,
2818 iph6->flow_lbl[0] & 0x0f,
2819 iph6->flow_lbl[1],
2820 iph6->flow_lbl[2]);
2821 break;
2822 }
2823 }
2824
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2825 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2826 {
2827 struct audit_buffer *audit_buf;
2828
2829 audit_buf = xfrm_audit_start("SAD-add");
2830 if (audit_buf == NULL)
2831 return;
2832 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2833 xfrm_audit_helper_sainfo(x, audit_buf);
2834 audit_log_format(audit_buf, " res=%u", result);
2835 audit_log_end(audit_buf);
2836 }
2837 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2838
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)2839 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2840 {
2841 struct audit_buffer *audit_buf;
2842
2843 audit_buf = xfrm_audit_start("SAD-delete");
2844 if (audit_buf == NULL)
2845 return;
2846 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2847 xfrm_audit_helper_sainfo(x, audit_buf);
2848 audit_log_format(audit_buf, " res=%u", result);
2849 audit_log_end(audit_buf);
2850 }
2851 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2852
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)2853 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2854 struct sk_buff *skb)
2855 {
2856 struct audit_buffer *audit_buf;
2857 u32 spi;
2858
2859 audit_buf = xfrm_audit_start("SA-replay-overflow");
2860 if (audit_buf == NULL)
2861 return;
2862 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2863 /* don't record the sequence number because it's inherent in this kind
2864 * of audit message */
2865 spi = ntohl(x->id.spi);
2866 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2867 audit_log_end(audit_buf);
2868 }
2869 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2870
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)2871 void xfrm_audit_state_replay(struct xfrm_state *x,
2872 struct sk_buff *skb, __be32 net_seq)
2873 {
2874 struct audit_buffer *audit_buf;
2875 u32 spi;
2876
2877 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2878 if (audit_buf == NULL)
2879 return;
2880 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2881 spi = ntohl(x->id.spi);
2882 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2883 spi, spi, ntohl(net_seq));
2884 audit_log_end(audit_buf);
2885 }
2886 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2887
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)2888 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2889 {
2890 struct audit_buffer *audit_buf;
2891
2892 audit_buf = xfrm_audit_start("SA-notfound");
2893 if (audit_buf == NULL)
2894 return;
2895 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2896 audit_log_end(audit_buf);
2897 }
2898 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2899
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)2900 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2901 __be32 net_spi, __be32 net_seq)
2902 {
2903 struct audit_buffer *audit_buf;
2904 u32 spi;
2905
2906 audit_buf = xfrm_audit_start("SA-notfound");
2907 if (audit_buf == NULL)
2908 return;
2909 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2910 spi = ntohl(net_spi);
2911 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2912 spi, spi, ntohl(net_seq));
2913 audit_log_end(audit_buf);
2914 }
2915 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2916
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)2917 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2918 struct sk_buff *skb, u8 proto)
2919 {
2920 struct audit_buffer *audit_buf;
2921 __be32 net_spi;
2922 __be32 net_seq;
2923
2924 audit_buf = xfrm_audit_start("SA-icv-failure");
2925 if (audit_buf == NULL)
2926 return;
2927 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2928 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2929 u32 spi = ntohl(net_spi);
2930 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2931 spi, spi, ntohl(net_seq));
2932 }
2933 audit_log_end(audit_buf);
2934 }
2935 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2936 #endif /* CONFIG_AUDITSYSCALL */
2937