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