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
87 #define XFRM_STATE_INSERT(by, _n, _h, _type) \
88 { \
89 struct xfrm_state *_x = NULL; \
90 \
91 if (_type != XFRM_DEV_OFFLOAD_PACKET) { \
92 hlist_for_each_entry_rcu(_x, _h, by) { \
93 if (_x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \
94 continue; \
95 break; \
96 } \
97 } \
98 \
99 if (!_x || _x->xso.type == XFRM_DEV_OFFLOAD_PACKET) \
100 /* SAD is empty or consist from HW SAs only */ \
101 hlist_add_head_rcu(_n, _h); \
102 else \
103 hlist_add_before_rcu(_n, &_x->by); \
104 }
105
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)106 static void xfrm_hash_transfer(struct hlist_head *list,
107 struct hlist_head *ndsttable,
108 struct hlist_head *nsrctable,
109 struct hlist_head *nspitable,
110 struct hlist_head *nseqtable,
111 unsigned int nhashmask)
112 {
113 struct hlist_node *tmp;
114 struct xfrm_state *x;
115
116 hlist_for_each_entry_safe(x, tmp, list, bydst) {
117 unsigned int h;
118
119 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
120 x->props.reqid, x->props.family,
121 nhashmask);
122 XFRM_STATE_INSERT(bydst, &x->bydst, ndsttable + h, x->xso.type);
123
124 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
125 x->props.family,
126 nhashmask);
127 XFRM_STATE_INSERT(bysrc, &x->bysrc, nsrctable + h, x->xso.type);
128
129 if (x->id.spi) {
130 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
131 x->id.proto, x->props.family,
132 nhashmask);
133 XFRM_STATE_INSERT(byspi, &x->byspi, nspitable + h,
134 x->xso.type);
135 }
136
137 if (x->km.seq) {
138 h = __xfrm_seq_hash(x->km.seq, nhashmask);
139 XFRM_STATE_INSERT(byseq, &x->byseq, nseqtable + h,
140 x->xso.type);
141 }
142 }
143 }
144
xfrm_hash_new_size(unsigned int state_hmask)145 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
146 {
147 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
148 }
149
xfrm_hash_resize(struct work_struct * work)150 static void xfrm_hash_resize(struct work_struct *work)
151 {
152 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
153 struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
154 unsigned long nsize, osize;
155 unsigned int nhashmask, ohashmask;
156 int i;
157
158 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
159 ndst = xfrm_hash_alloc(nsize);
160 if (!ndst)
161 return;
162 nsrc = xfrm_hash_alloc(nsize);
163 if (!nsrc) {
164 xfrm_hash_free(ndst, nsize);
165 return;
166 }
167 nspi = xfrm_hash_alloc(nsize);
168 if (!nspi) {
169 xfrm_hash_free(ndst, nsize);
170 xfrm_hash_free(nsrc, nsize);
171 return;
172 }
173 nseq = xfrm_hash_alloc(nsize);
174 if (!nseq) {
175 xfrm_hash_free(ndst, nsize);
176 xfrm_hash_free(nsrc, nsize);
177 xfrm_hash_free(nspi, nsize);
178 return;
179 }
180
181 spin_lock_bh(&net->xfrm.xfrm_state_lock);
182 write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
183
184 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
185 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
186 for (i = net->xfrm.state_hmask; i >= 0; i--)
187 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
188
189 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
190 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
191 oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
192 ohashmask = net->xfrm.state_hmask;
193
194 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
195 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
196 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
197 rcu_assign_pointer(net->xfrm.state_byseq, nseq);
198 net->xfrm.state_hmask = nhashmask;
199
200 write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
201 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
202
203 osize = (ohashmask + 1) * sizeof(struct hlist_head);
204
205 synchronize_rcu();
206
207 xfrm_hash_free(odst, osize);
208 xfrm_hash_free(osrc, osize);
209 xfrm_hash_free(ospi, osize);
210 xfrm_hash_free(oseq, osize);
211 }
212
213 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
214 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
215
216 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
217
218 int __xfrm_state_delete(struct xfrm_state *x);
219
220 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
221 static bool km_is_alive(const struct km_event *c);
222 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
223
xfrm_register_type(const struct xfrm_type * type,unsigned short family)224 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
225 {
226 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
227 int err = 0;
228
229 if (!afinfo)
230 return -EAFNOSUPPORT;
231
232 #define X(afi, T, name) do { \
233 WARN_ON((afi)->type_ ## name); \
234 (afi)->type_ ## name = (T); \
235 } while (0)
236
237 switch (type->proto) {
238 case IPPROTO_COMP:
239 X(afinfo, type, comp);
240 break;
241 case IPPROTO_AH:
242 X(afinfo, type, ah);
243 break;
244 case IPPROTO_ESP:
245 X(afinfo, type, esp);
246 break;
247 case IPPROTO_IPIP:
248 X(afinfo, type, ipip);
249 break;
250 case IPPROTO_DSTOPTS:
251 X(afinfo, type, dstopts);
252 break;
253 case IPPROTO_ROUTING:
254 X(afinfo, type, routing);
255 break;
256 case IPPROTO_IPV6:
257 X(afinfo, type, ipip6);
258 break;
259 default:
260 WARN_ON(1);
261 err = -EPROTONOSUPPORT;
262 break;
263 }
264 #undef X
265 rcu_read_unlock();
266 return err;
267 }
268 EXPORT_SYMBOL(xfrm_register_type);
269
xfrm_unregister_type(const struct xfrm_type * type,unsigned short family)270 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
271 {
272 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
273
274 if (unlikely(afinfo == NULL))
275 return;
276
277 #define X(afi, T, name) do { \
278 WARN_ON((afi)->type_ ## name != (T)); \
279 (afi)->type_ ## name = NULL; \
280 } while (0)
281
282 switch (type->proto) {
283 case IPPROTO_COMP:
284 X(afinfo, type, comp);
285 break;
286 case IPPROTO_AH:
287 X(afinfo, type, ah);
288 break;
289 case IPPROTO_ESP:
290 X(afinfo, type, esp);
291 break;
292 case IPPROTO_IPIP:
293 X(afinfo, type, ipip);
294 break;
295 case IPPROTO_DSTOPTS:
296 X(afinfo, type, dstopts);
297 break;
298 case IPPROTO_ROUTING:
299 X(afinfo, type, routing);
300 break;
301 case IPPROTO_IPV6:
302 X(afinfo, type, ipip6);
303 break;
304 default:
305 WARN_ON(1);
306 break;
307 }
308 #undef X
309 rcu_read_unlock();
310 }
311 EXPORT_SYMBOL(xfrm_unregister_type);
312
xfrm_get_type(u8 proto,unsigned short family)313 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
314 {
315 const struct xfrm_type *type = NULL;
316 struct xfrm_state_afinfo *afinfo;
317 int modload_attempted = 0;
318
319 retry:
320 afinfo = xfrm_state_get_afinfo(family);
321 if (unlikely(afinfo == NULL))
322 return NULL;
323
324 switch (proto) {
325 case IPPROTO_COMP:
326 type = afinfo->type_comp;
327 break;
328 case IPPROTO_AH:
329 type = afinfo->type_ah;
330 break;
331 case IPPROTO_ESP:
332 type = afinfo->type_esp;
333 break;
334 case IPPROTO_IPIP:
335 type = afinfo->type_ipip;
336 break;
337 case IPPROTO_DSTOPTS:
338 type = afinfo->type_dstopts;
339 break;
340 case IPPROTO_ROUTING:
341 type = afinfo->type_routing;
342 break;
343 case IPPROTO_IPV6:
344 type = afinfo->type_ipip6;
345 break;
346 default:
347 break;
348 }
349
350 if (unlikely(type && !try_module_get(type->owner)))
351 type = NULL;
352
353 rcu_read_unlock();
354
355 if (!type && !modload_attempted) {
356 request_module("xfrm-type-%d-%d", family, proto);
357 modload_attempted = 1;
358 goto retry;
359 }
360
361 return type;
362 }
363
xfrm_put_type(const struct xfrm_type * type)364 static void xfrm_put_type(const struct xfrm_type *type)
365 {
366 module_put(type->owner);
367 }
368
xfrm_register_type_offload(const struct xfrm_type_offload * type,unsigned short family)369 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
370 unsigned short family)
371 {
372 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
373 int err = 0;
374
375 if (unlikely(afinfo == NULL))
376 return -EAFNOSUPPORT;
377
378 switch (type->proto) {
379 case IPPROTO_ESP:
380 WARN_ON(afinfo->type_offload_esp);
381 afinfo->type_offload_esp = type;
382 break;
383 default:
384 WARN_ON(1);
385 err = -EPROTONOSUPPORT;
386 break;
387 }
388
389 rcu_read_unlock();
390 return err;
391 }
392 EXPORT_SYMBOL(xfrm_register_type_offload);
393
xfrm_unregister_type_offload(const struct xfrm_type_offload * type,unsigned short family)394 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
395 unsigned short family)
396 {
397 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
398
399 if (unlikely(afinfo == NULL))
400 return;
401
402 switch (type->proto) {
403 case IPPROTO_ESP:
404 WARN_ON(afinfo->type_offload_esp != type);
405 afinfo->type_offload_esp = NULL;
406 break;
407 default:
408 WARN_ON(1);
409 break;
410 }
411 rcu_read_unlock();
412 }
413 EXPORT_SYMBOL(xfrm_unregister_type_offload);
414
415 static const struct xfrm_type_offload *
xfrm_get_type_offload(u8 proto,unsigned short family,bool try_load)416 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
417 {
418 const struct xfrm_type_offload *type = NULL;
419 struct xfrm_state_afinfo *afinfo;
420
421 retry:
422 afinfo = xfrm_state_get_afinfo(family);
423 if (unlikely(afinfo == NULL))
424 return NULL;
425
426 switch (proto) {
427 case IPPROTO_ESP:
428 type = afinfo->type_offload_esp;
429 break;
430 default:
431 break;
432 }
433
434 if ((type && !try_module_get(type->owner)))
435 type = NULL;
436
437 rcu_read_unlock();
438
439 if (!type && try_load) {
440 request_module("xfrm-offload-%d-%d", family, proto);
441 try_load = false;
442 goto retry;
443 }
444
445 return type;
446 }
447
xfrm_put_type_offload(const struct xfrm_type_offload * type)448 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
449 {
450 module_put(type->owner);
451 }
452
453 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
454 [XFRM_MODE_BEET] = {
455 .encap = XFRM_MODE_BEET,
456 .flags = XFRM_MODE_FLAG_TUNNEL,
457 .family = AF_INET,
458 },
459 [XFRM_MODE_TRANSPORT] = {
460 .encap = XFRM_MODE_TRANSPORT,
461 .family = AF_INET,
462 },
463 [XFRM_MODE_TUNNEL] = {
464 .encap = XFRM_MODE_TUNNEL,
465 .flags = XFRM_MODE_FLAG_TUNNEL,
466 .family = AF_INET,
467 },
468 };
469
470 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
471 [XFRM_MODE_BEET] = {
472 .encap = XFRM_MODE_BEET,
473 .flags = XFRM_MODE_FLAG_TUNNEL,
474 .family = AF_INET6,
475 },
476 [XFRM_MODE_ROUTEOPTIMIZATION] = {
477 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
478 .family = AF_INET6,
479 },
480 [XFRM_MODE_TRANSPORT] = {
481 .encap = XFRM_MODE_TRANSPORT,
482 .family = AF_INET6,
483 },
484 [XFRM_MODE_TUNNEL] = {
485 .encap = XFRM_MODE_TUNNEL,
486 .flags = XFRM_MODE_FLAG_TUNNEL,
487 .family = AF_INET6,
488 },
489 };
490
xfrm_get_mode(unsigned int encap,int family)491 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
492 {
493 const struct xfrm_mode *mode;
494
495 if (unlikely(encap >= XFRM_MODE_MAX))
496 return NULL;
497
498 switch (family) {
499 case AF_INET:
500 mode = &xfrm4_mode_map[encap];
501 if (mode->family == family)
502 return mode;
503 break;
504 case AF_INET6:
505 mode = &xfrm6_mode_map[encap];
506 if (mode->family == family)
507 return mode;
508 break;
509 default:
510 break;
511 }
512
513 return NULL;
514 }
515
xfrm_state_free(struct xfrm_state * x)516 void xfrm_state_free(struct xfrm_state *x)
517 {
518 kmem_cache_free(xfrm_state_cache, x);
519 }
520 EXPORT_SYMBOL(xfrm_state_free);
521
___xfrm_state_destroy(struct xfrm_state * x)522 static void ___xfrm_state_destroy(struct xfrm_state *x)
523 {
524 hrtimer_cancel(&x->mtimer);
525 del_timer_sync(&x->rtimer);
526 kfree(x->aead);
527 kfree(x->aalg);
528 kfree(x->ealg);
529 kfree(x->calg);
530 kfree(x->encap);
531 kfree(x->coaddr);
532 kfree(x->replay_esn);
533 kfree(x->preplay_esn);
534 if (x->type_offload)
535 xfrm_put_type_offload(x->type_offload);
536 if (x->type) {
537 x->type->destructor(x);
538 xfrm_put_type(x->type);
539 }
540 if (x->xfrag.page)
541 put_page(x->xfrag.page);
542 xfrm_dev_state_free(x);
543 security_xfrm_state_free(x);
544 xfrm_state_free(x);
545 }
546
xfrm_state_gc_task(struct work_struct * work)547 static void xfrm_state_gc_task(struct work_struct *work)
548 {
549 struct xfrm_state *x;
550 struct hlist_node *tmp;
551 struct hlist_head gc_list;
552
553 spin_lock_bh(&xfrm_state_gc_lock);
554 hlist_move_list(&xfrm_state_gc_list, &gc_list);
555 spin_unlock_bh(&xfrm_state_gc_lock);
556
557 synchronize_rcu();
558
559 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
560 ___xfrm_state_destroy(x);
561 }
562
xfrm_timer_handler(struct hrtimer * me)563 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
564 {
565 struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
566 enum hrtimer_restart ret = HRTIMER_NORESTART;
567 time64_t now = ktime_get_real_seconds();
568 time64_t next = TIME64_MAX;
569 int warn = 0;
570 int err = 0;
571
572 spin_lock(&x->lock);
573 xfrm_dev_state_update_curlft(x);
574
575 if (x->km.state == XFRM_STATE_DEAD)
576 goto out;
577 if (x->km.state == XFRM_STATE_EXPIRED)
578 goto expired;
579 if (x->lft.hard_add_expires_seconds) {
580 time64_t tmo = x->lft.hard_add_expires_seconds +
581 x->curlft.add_time - now;
582 if (tmo <= 0) {
583 if (x->xflags & XFRM_SOFT_EXPIRE) {
584 /* enter hard expire without soft expire first?!
585 * setting a new date could trigger this.
586 * workaround: fix x->curflt.add_time by below:
587 */
588 x->curlft.add_time = now - x->saved_tmo - 1;
589 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
590 } else
591 goto expired;
592 }
593 if (tmo < next)
594 next = tmo;
595 }
596 if (x->lft.hard_use_expires_seconds) {
597 time64_t tmo = x->lft.hard_use_expires_seconds +
598 (READ_ONCE(x->curlft.use_time) ? : now) - now;
599 if (tmo <= 0)
600 goto expired;
601 if (tmo < next)
602 next = tmo;
603 }
604 if (x->km.dying)
605 goto resched;
606 if (x->lft.soft_add_expires_seconds) {
607 time64_t tmo = x->lft.soft_add_expires_seconds +
608 x->curlft.add_time - now;
609 if (tmo <= 0) {
610 warn = 1;
611 x->xflags &= ~XFRM_SOFT_EXPIRE;
612 } else if (tmo < next) {
613 next = tmo;
614 x->xflags |= XFRM_SOFT_EXPIRE;
615 x->saved_tmo = tmo;
616 }
617 }
618 if (x->lft.soft_use_expires_seconds) {
619 time64_t tmo = x->lft.soft_use_expires_seconds +
620 (READ_ONCE(x->curlft.use_time) ? : now) - now;
621 if (tmo <= 0)
622 warn = 1;
623 else if (tmo < next)
624 next = tmo;
625 }
626
627 x->km.dying = warn;
628 if (warn)
629 km_state_expired(x, 0, 0);
630 resched:
631 if (next != TIME64_MAX) {
632 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
633 ret = HRTIMER_RESTART;
634 }
635
636 goto out;
637
638 expired:
639 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
640 x->km.state = XFRM_STATE_EXPIRED;
641
642 err = __xfrm_state_delete(x);
643 if (!err)
644 km_state_expired(x, 1, 0);
645
646 xfrm_audit_state_delete(x, err ? 0 : 1, true);
647
648 out:
649 spin_unlock(&x->lock);
650 return ret;
651 }
652
653 static void xfrm_replay_timer_handler(struct timer_list *t);
654
xfrm_state_alloc(struct net * net)655 struct xfrm_state *xfrm_state_alloc(struct net *net)
656 {
657 struct xfrm_state *x;
658
659 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
660
661 if (x) {
662 write_pnet(&x->xs_net, net);
663 refcount_set(&x->refcnt, 1);
664 atomic_set(&x->tunnel_users, 0);
665 INIT_LIST_HEAD(&x->km.all);
666 INIT_HLIST_NODE(&x->bydst);
667 INIT_HLIST_NODE(&x->bysrc);
668 INIT_HLIST_NODE(&x->byspi);
669 INIT_HLIST_NODE(&x->byseq);
670 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
671 x->mtimer.function = xfrm_timer_handler;
672 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
673 x->curlft.add_time = ktime_get_real_seconds();
674 x->lft.soft_byte_limit = XFRM_INF;
675 x->lft.soft_packet_limit = XFRM_INF;
676 x->lft.hard_byte_limit = XFRM_INF;
677 x->lft.hard_packet_limit = XFRM_INF;
678 x->replay_maxage = 0;
679 x->replay_maxdiff = 0;
680 spin_lock_init(&x->lock);
681 }
682 return x;
683 }
684 EXPORT_SYMBOL(xfrm_state_alloc);
685
__xfrm_state_destroy(struct xfrm_state * x,bool sync)686 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
687 {
688 WARN_ON(x->km.state != XFRM_STATE_DEAD);
689
690 if (sync) {
691 synchronize_rcu();
692 ___xfrm_state_destroy(x);
693 } else {
694 spin_lock_bh(&xfrm_state_gc_lock);
695 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
696 spin_unlock_bh(&xfrm_state_gc_lock);
697 schedule_work(&xfrm_state_gc_work);
698 }
699 }
700 EXPORT_SYMBOL(__xfrm_state_destroy);
701
__xfrm_state_delete(struct xfrm_state * x)702 int __xfrm_state_delete(struct xfrm_state *x)
703 {
704 struct net *net = xs_net(x);
705 int err = -ESRCH;
706
707 if (x->km.state != XFRM_STATE_DEAD) {
708 x->km.state = XFRM_STATE_DEAD;
709 spin_lock(&net->xfrm.xfrm_state_lock);
710 list_del(&x->km.all);
711 hlist_del_rcu(&x->bydst);
712 hlist_del_rcu(&x->bysrc);
713 if (x->km.seq)
714 hlist_del_rcu(&x->byseq);
715 if (x->id.spi)
716 hlist_del_rcu(&x->byspi);
717 net->xfrm.state_num--;
718 spin_unlock(&net->xfrm.xfrm_state_lock);
719
720 if (x->encap_sk)
721 sock_put(rcu_dereference_raw(x->encap_sk));
722
723 xfrm_dev_state_delete(x);
724
725 /* All xfrm_state objects are created by xfrm_state_alloc.
726 * The xfrm_state_alloc call gives a reference, and that
727 * is what we are dropping here.
728 */
729 xfrm_state_put(x);
730 err = 0;
731 }
732
733 return err;
734 }
735 EXPORT_SYMBOL(__xfrm_state_delete);
736
xfrm_state_delete(struct xfrm_state * x)737 int xfrm_state_delete(struct xfrm_state *x)
738 {
739 int err;
740
741 spin_lock_bh(&x->lock);
742 err = __xfrm_state_delete(x);
743 spin_unlock_bh(&x->lock);
744
745 return err;
746 }
747 EXPORT_SYMBOL(xfrm_state_delete);
748
749 #ifdef CONFIG_SECURITY_NETWORK_XFRM
750 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)751 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
752 {
753 int i, err = 0;
754
755 for (i = 0; i <= net->xfrm.state_hmask; i++) {
756 struct xfrm_state *x;
757
758 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
759 if (xfrm_id_proto_match(x->id.proto, proto) &&
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
770 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)771 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
772 {
773 int i, err = 0;
774
775 for (i = 0; i <= net->xfrm.state_hmask; i++) {
776 struct xfrm_state *x;
777 struct xfrm_dev_offload *xso;
778
779 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
780 xso = &x->xso;
781
782 if (xso->dev == dev &&
783 (err = security_xfrm_state_delete(x)) != 0) {
784 xfrm_audit_state_delete(x, 0, task_valid);
785 return err;
786 }
787 }
788 }
789
790 return err;
791 }
792 #else
793 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)794 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
795 {
796 return 0;
797 }
798
799 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)800 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
801 {
802 return 0;
803 }
804 #endif
805
xfrm_state_flush(struct net * net,u8 proto,bool task_valid,bool sync)806 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
807 {
808 int i, err = 0, cnt = 0;
809
810 spin_lock_bh(&net->xfrm.xfrm_state_lock);
811 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
812 if (err)
813 goto out;
814
815 err = -ESRCH;
816 for (i = 0; i <= net->xfrm.state_hmask; i++) {
817 struct xfrm_state *x;
818 restart:
819 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
820 if (!xfrm_state_kern(x) &&
821 xfrm_id_proto_match(x->id.proto, proto)) {
822 xfrm_state_hold(x);
823 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
824
825 err = xfrm_state_delete(x);
826 xfrm_audit_state_delete(x, err ? 0 : 1,
827 task_valid);
828 if (sync)
829 xfrm_state_put_sync(x);
830 else
831 xfrm_state_put(x);
832 if (!err)
833 cnt++;
834
835 spin_lock_bh(&net->xfrm.xfrm_state_lock);
836 goto restart;
837 }
838 }
839 }
840 out:
841 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
842 if (cnt)
843 err = 0;
844
845 return err;
846 }
847 EXPORT_SYMBOL(xfrm_state_flush);
848
xfrm_dev_state_flush(struct net * net,struct net_device * dev,bool task_valid)849 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
850 {
851 int i, err = 0, cnt = 0;
852
853 spin_lock_bh(&net->xfrm.xfrm_state_lock);
854 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
855 if (err)
856 goto out;
857
858 err = -ESRCH;
859 for (i = 0; i <= net->xfrm.state_hmask; i++) {
860 struct xfrm_state *x;
861 struct xfrm_dev_offload *xso;
862 restart:
863 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
864 xso = &x->xso;
865
866 if (!xfrm_state_kern(x) && xso->dev == dev) {
867 xfrm_state_hold(x);
868 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
869
870 err = xfrm_state_delete(x);
871 xfrm_audit_state_delete(x, err ? 0 : 1,
872 task_valid);
873 xfrm_state_put(x);
874 if (!err)
875 cnt++;
876
877 spin_lock_bh(&net->xfrm.xfrm_state_lock);
878 goto restart;
879 }
880 }
881 }
882 if (cnt)
883 err = 0;
884
885 out:
886 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
887 return err;
888 }
889 EXPORT_SYMBOL(xfrm_dev_state_flush);
890
xfrm_sad_getinfo(struct net * net,struct xfrmk_sadinfo * si)891 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
892 {
893 spin_lock_bh(&net->xfrm.xfrm_state_lock);
894 si->sadcnt = net->xfrm.state_num;
895 si->sadhcnt = net->xfrm.state_hmask + 1;
896 si->sadhmcnt = xfrm_state_hashmax;
897 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
898 }
899 EXPORT_SYMBOL(xfrm_sad_getinfo);
900
901 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)902 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
903 {
904 const struct flowi4 *fl4 = &fl->u.ip4;
905
906 sel->daddr.a4 = fl4->daddr;
907 sel->saddr.a4 = fl4->saddr;
908 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
909 sel->dport_mask = htons(0xffff);
910 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
911 sel->sport_mask = htons(0xffff);
912 sel->family = AF_INET;
913 sel->prefixlen_d = 32;
914 sel->prefixlen_s = 32;
915 sel->proto = fl4->flowi4_proto;
916 sel->ifindex = fl4->flowi4_oif;
917 }
918
919 static void
__xfrm6_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)920 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
921 {
922 const struct flowi6 *fl6 = &fl->u.ip6;
923
924 /* Initialize temporary selector matching only to current session. */
925 *(struct in6_addr *)&sel->daddr = fl6->daddr;
926 *(struct in6_addr *)&sel->saddr = fl6->saddr;
927 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
928 sel->dport_mask = htons(0xffff);
929 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
930 sel->sport_mask = htons(0xffff);
931 sel->family = AF_INET6;
932 sel->prefixlen_d = 128;
933 sel->prefixlen_s = 128;
934 sel->proto = fl6->flowi6_proto;
935 sel->ifindex = fl6->flowi6_oif;
936 }
937
938 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)939 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
940 const struct xfrm_tmpl *tmpl,
941 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
942 unsigned short family)
943 {
944 switch (family) {
945 case AF_INET:
946 __xfrm4_init_tempsel(&x->sel, fl);
947 break;
948 case AF_INET6:
949 __xfrm6_init_tempsel(&x->sel, fl);
950 break;
951 }
952
953 x->id = tmpl->id;
954
955 switch (tmpl->encap_family) {
956 case AF_INET:
957 if (x->id.daddr.a4 == 0)
958 x->id.daddr.a4 = daddr->a4;
959 x->props.saddr = tmpl->saddr;
960 if (x->props.saddr.a4 == 0)
961 x->props.saddr.a4 = saddr->a4;
962 break;
963 case AF_INET6:
964 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
965 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
966 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
967 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
968 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
969 break;
970 }
971
972 x->props.mode = tmpl->mode;
973 x->props.reqid = tmpl->reqid;
974 x->props.family = tmpl->encap_family;
975 }
976
__xfrm_state_lookup_all(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family,struct xfrm_dev_offload * xdo)977 static struct xfrm_state *__xfrm_state_lookup_all(struct net *net, u32 mark,
978 const xfrm_address_t *daddr,
979 __be32 spi, u8 proto,
980 unsigned short family,
981 struct xfrm_dev_offload *xdo)
982 {
983 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
984 struct xfrm_state *x;
985
986 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
987 #ifdef CONFIG_XFRM_OFFLOAD
988 if (xdo->type == XFRM_DEV_OFFLOAD_PACKET) {
989 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
990 /* HW states are in the head of list, there is
991 * no need to iterate further.
992 */
993 break;
994
995 /* Packet offload: both policy and SA should
996 * have same device.
997 */
998 if (xdo->dev != x->xso.dev)
999 continue;
1000 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1001 /* Skip HW policy for SW lookups */
1002 continue;
1003 #endif
1004 if (x->props.family != family ||
1005 x->id.spi != spi ||
1006 x->id.proto != proto ||
1007 !xfrm_addr_equal(&x->id.daddr, daddr, family))
1008 continue;
1009
1010 if ((mark & x->mark.m) != x->mark.v)
1011 continue;
1012 if (!xfrm_state_hold_rcu(x))
1013 continue;
1014 return x;
1015 }
1016
1017 return NULL;
1018 }
1019
__xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1020 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
1021 const xfrm_address_t *daddr,
1022 __be32 spi, u8 proto,
1023 unsigned short family)
1024 {
1025 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
1026 struct xfrm_state *x;
1027
1028 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
1029 if (x->props.family != family ||
1030 x->id.spi != spi ||
1031 x->id.proto != proto ||
1032 !xfrm_addr_equal(&x->id.daddr, daddr, family))
1033 continue;
1034
1035 if ((mark & x->mark.m) != x->mark.v)
1036 continue;
1037 if (!xfrm_state_hold_rcu(x))
1038 continue;
1039 return x;
1040 }
1041
1042 return NULL;
1043 }
1044
__xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)1045 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1046 const xfrm_address_t *daddr,
1047 const xfrm_address_t *saddr,
1048 u8 proto, unsigned short family)
1049 {
1050 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
1051 struct xfrm_state *x;
1052
1053 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
1054 if (x->props.family != family ||
1055 x->id.proto != proto ||
1056 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1057 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1058 continue;
1059
1060 if ((mark & x->mark.m) != x->mark.v)
1061 continue;
1062 if (!xfrm_state_hold_rcu(x))
1063 continue;
1064 return x;
1065 }
1066
1067 return NULL;
1068 }
1069
1070 static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state * x,int use_spi,int family)1071 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1072 {
1073 struct net *net = xs_net(x);
1074 u32 mark = x->mark.v & x->mark.m;
1075
1076 if (use_spi)
1077 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1078 x->id.spi, x->id.proto, family);
1079 else
1080 return __xfrm_state_lookup_byaddr(net, mark,
1081 &x->id.daddr,
1082 &x->props.saddr,
1083 x->id.proto, family);
1084 }
1085
xfrm_hash_grow_check(struct net * net,int have_hash_collision)1086 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
1087 {
1088 if (have_hash_collision &&
1089 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1090 net->xfrm.state_num > net->xfrm.state_hmask)
1091 schedule_work(&net->xfrm.state_hash_work);
1092 }
1093
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)1094 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1095 const struct flowi *fl, unsigned short family,
1096 struct xfrm_state **best, int *acq_in_progress,
1097 int *error)
1098 {
1099 /* Resolution logic:
1100 * 1. There is a valid state with matching selector. Done.
1101 * 2. Valid state with inappropriate selector. Skip.
1102 *
1103 * Entering area of "sysdeps".
1104 *
1105 * 3. If state is not valid, selector is temporary, it selects
1106 * only session which triggered previous resolution. Key
1107 * manager will do something to install a state with proper
1108 * selector.
1109 */
1110 if (x->km.state == XFRM_STATE_VALID) {
1111 if ((x->sel.family &&
1112 (x->sel.family != family ||
1113 !xfrm_selector_match(&x->sel, fl, family))) ||
1114 !security_xfrm_state_pol_flow_match(x, pol,
1115 &fl->u.__fl_common))
1116 return;
1117
1118 if (!*best ||
1119 (*best)->km.dying > x->km.dying ||
1120 ((*best)->km.dying == x->km.dying &&
1121 (*best)->curlft.add_time < x->curlft.add_time))
1122 *best = x;
1123 } else if (x->km.state == XFRM_STATE_ACQ) {
1124 *acq_in_progress = 1;
1125 } else if (x->km.state == XFRM_STATE_ERROR ||
1126 x->km.state == XFRM_STATE_EXPIRED) {
1127 if ((!x->sel.family ||
1128 (x->sel.family == family &&
1129 xfrm_selector_match(&x->sel, fl, family))) &&
1130 security_xfrm_state_pol_flow_match(x, pol,
1131 &fl->u.__fl_common))
1132 *error = -ESRCH;
1133 }
1134 }
1135
1136 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)1137 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1138 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1139 struct xfrm_policy *pol, int *err,
1140 unsigned short family, u32 if_id)
1141 {
1142 static xfrm_address_t saddr_wildcard = { };
1143 struct net *net = xp_net(pol);
1144 unsigned int h, h_wildcard;
1145 struct xfrm_state *x, *x0, *to_put;
1146 int acquire_in_progress = 0;
1147 int error = 0;
1148 struct xfrm_state *best = NULL;
1149 u32 mark = pol->mark.v & pol->mark.m;
1150 unsigned short encap_family = tmpl->encap_family;
1151 unsigned int sequence;
1152 struct km_event c;
1153
1154 to_put = NULL;
1155
1156 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1157
1158 rcu_read_lock();
1159 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1160 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1161 #ifdef CONFIG_XFRM_OFFLOAD
1162 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1163 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1164 /* HW states are in the head of list, there is
1165 * no need to iterate further.
1166 */
1167 break;
1168
1169 /* Packet offload: both policy and SA should
1170 * have same device.
1171 */
1172 if (pol->xdo.dev != x->xso.dev)
1173 continue;
1174 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1175 /* Skip HW policy for SW lookups */
1176 continue;
1177 #endif
1178 if (x->props.family == encap_family &&
1179 x->props.reqid == tmpl->reqid &&
1180 (mark & x->mark.m) == x->mark.v &&
1181 x->if_id == if_id &&
1182 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1183 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1184 tmpl->mode == x->props.mode &&
1185 tmpl->id.proto == x->id.proto &&
1186 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1187 xfrm_state_look_at(pol, x, fl, family,
1188 &best, &acquire_in_progress, &error);
1189 }
1190 if (best || acquire_in_progress)
1191 goto found;
1192
1193 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1194 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1195 #ifdef CONFIG_XFRM_OFFLOAD
1196 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1197 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1198 /* HW states are in the head of list, there is
1199 * no need to iterate further.
1200 */
1201 break;
1202
1203 /* Packet offload: both policy and SA should
1204 * have same device.
1205 */
1206 if (pol->xdo.dev != x->xso.dev)
1207 continue;
1208 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1209 /* Skip HW policy for SW lookups */
1210 continue;
1211 #endif
1212 if (x->props.family == encap_family &&
1213 x->props.reqid == tmpl->reqid &&
1214 (mark & x->mark.m) == x->mark.v &&
1215 x->if_id == if_id &&
1216 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1217 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1218 tmpl->mode == x->props.mode &&
1219 tmpl->id.proto == x->id.proto &&
1220 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1221 xfrm_state_look_at(pol, x, fl, family,
1222 &best, &acquire_in_progress, &error);
1223 }
1224
1225 found:
1226 x = best;
1227 if (!x && !error && !acquire_in_progress) {
1228 if (tmpl->id.spi &&
1229 (x0 = __xfrm_state_lookup_all(net, mark, daddr,
1230 tmpl->id.spi, tmpl->id.proto,
1231 encap_family,
1232 &pol->xdo)) != NULL) {
1233 to_put = x0;
1234 error = -EEXIST;
1235 goto out;
1236 }
1237
1238 c.net = net;
1239 /* If the KMs have no listeners (yet...), avoid allocating an SA
1240 * for each and every packet - garbage collection might not
1241 * handle the flood.
1242 */
1243 if (!km_is_alive(&c)) {
1244 error = -ESRCH;
1245 goto out;
1246 }
1247
1248 x = xfrm_state_alloc(net);
1249 if (x == NULL) {
1250 error = -ENOMEM;
1251 goto out;
1252 }
1253 /* Initialize temporary state matching only
1254 * to current session. */
1255 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1256 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1257 x->if_id = if_id;
1258
1259 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1260 if (error) {
1261 x->km.state = XFRM_STATE_DEAD;
1262 to_put = x;
1263 x = NULL;
1264 goto out;
1265 }
1266 #ifdef CONFIG_XFRM_OFFLOAD
1267 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1268 struct xfrm_dev_offload *xdo = &pol->xdo;
1269 struct xfrm_dev_offload *xso = &x->xso;
1270
1271 xso->type = XFRM_DEV_OFFLOAD_PACKET;
1272 xso->dir = xdo->dir;
1273 xso->dev = xdo->dev;
1274 xso->real_dev = xdo->real_dev;
1275 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ;
1276 netdev_tracker_alloc(xso->dev, &xso->dev_tracker,
1277 GFP_ATOMIC);
1278 error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
1279 if (error) {
1280 xso->dir = 0;
1281 netdev_put(xso->dev, &xso->dev_tracker);
1282 xso->dev = NULL;
1283 xso->real_dev = NULL;
1284 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1285 x->km.state = XFRM_STATE_DEAD;
1286 to_put = x;
1287 x = NULL;
1288 goto out;
1289 }
1290 }
1291 #endif
1292 if (km_query(x, tmpl, pol) == 0) {
1293 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1294 x->km.state = XFRM_STATE_ACQ;
1295 list_add(&x->km.all, &net->xfrm.state_all);
1296 XFRM_STATE_INSERT(bydst, &x->bydst,
1297 net->xfrm.state_bydst + h,
1298 x->xso.type);
1299 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1300 XFRM_STATE_INSERT(bysrc, &x->bysrc,
1301 net->xfrm.state_bysrc + h,
1302 x->xso.type);
1303 if (x->id.spi) {
1304 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1305 XFRM_STATE_INSERT(byspi, &x->byspi,
1306 net->xfrm.state_byspi + h,
1307 x->xso.type);
1308 }
1309 if (x->km.seq) {
1310 h = xfrm_seq_hash(net, x->km.seq);
1311 XFRM_STATE_INSERT(byseq, &x->byseq,
1312 net->xfrm.state_byseq + h,
1313 x->xso.type);
1314 }
1315 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1316 hrtimer_start(&x->mtimer,
1317 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1318 HRTIMER_MODE_REL_SOFT);
1319 net->xfrm.state_num++;
1320 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1321 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1322 } else {
1323 #ifdef CONFIG_XFRM_OFFLOAD
1324 struct xfrm_dev_offload *xso = &x->xso;
1325
1326 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) {
1327 xfrm_dev_state_delete(x);
1328 xfrm_dev_state_free(x);
1329 }
1330 #endif
1331 x->km.state = XFRM_STATE_DEAD;
1332 to_put = x;
1333 x = NULL;
1334 error = -ESRCH;
1335 }
1336 }
1337 out:
1338 if (x) {
1339 if (!xfrm_state_hold_rcu(x)) {
1340 *err = -EAGAIN;
1341 x = NULL;
1342 }
1343 } else {
1344 *err = acquire_in_progress ? -EAGAIN : error;
1345 }
1346 rcu_read_unlock();
1347 if (to_put)
1348 xfrm_state_put(to_put);
1349
1350 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1351 *err = -EAGAIN;
1352 if (x) {
1353 xfrm_state_put(x);
1354 x = NULL;
1355 }
1356 }
1357
1358 return x;
1359 }
1360
1361 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)1362 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1363 xfrm_address_t *daddr, xfrm_address_t *saddr,
1364 unsigned short family, u8 mode, u8 proto, u32 reqid)
1365 {
1366 unsigned int h;
1367 struct xfrm_state *rx = NULL, *x = NULL;
1368
1369 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1370 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1371 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1372 if (x->props.family == family &&
1373 x->props.reqid == reqid &&
1374 (mark & x->mark.m) == x->mark.v &&
1375 x->if_id == if_id &&
1376 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1377 xfrm_state_addr_check(x, daddr, saddr, family) &&
1378 mode == x->props.mode &&
1379 proto == x->id.proto &&
1380 x->km.state == XFRM_STATE_VALID) {
1381 rx = x;
1382 break;
1383 }
1384 }
1385
1386 if (rx)
1387 xfrm_state_hold(rx);
1388 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1389
1390
1391 return rx;
1392 }
1393 EXPORT_SYMBOL(xfrm_stateonly_find);
1394
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1395 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1396 unsigned short family)
1397 {
1398 struct xfrm_state *x;
1399 struct xfrm_state_walk *w;
1400
1401 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1402 list_for_each_entry(w, &net->xfrm.state_all, all) {
1403 x = container_of(w, struct xfrm_state, km);
1404 if (x->props.family != family ||
1405 x->id.spi != spi)
1406 continue;
1407
1408 xfrm_state_hold(x);
1409 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1410 return x;
1411 }
1412 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1413 return NULL;
1414 }
1415 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1416
__xfrm_state_insert(struct xfrm_state * x)1417 static void __xfrm_state_insert(struct xfrm_state *x)
1418 {
1419 struct net *net = xs_net(x);
1420 unsigned int h;
1421
1422 list_add(&x->km.all, &net->xfrm.state_all);
1423
1424 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1425 x->props.reqid, x->props.family);
1426 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1427 x->xso.type);
1428
1429 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1430 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1431 x->xso.type);
1432
1433 if (x->id.spi) {
1434 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1435 x->props.family);
1436
1437 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
1438 x->xso.type);
1439 }
1440
1441 if (x->km.seq) {
1442 h = xfrm_seq_hash(net, x->km.seq);
1443
1444 XFRM_STATE_INSERT(byseq, &x->byseq, net->xfrm.state_byseq + h,
1445 x->xso.type);
1446 }
1447
1448 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1449 if (x->replay_maxage)
1450 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1451
1452 net->xfrm.state_num++;
1453
1454 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1455 }
1456
1457 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1458 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1459 {
1460 struct net *net = xs_net(xnew);
1461 unsigned short family = xnew->props.family;
1462 u32 reqid = xnew->props.reqid;
1463 struct xfrm_state *x;
1464 unsigned int h;
1465 u32 mark = xnew->mark.v & xnew->mark.m;
1466 u32 if_id = xnew->if_id;
1467
1468 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1469 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1470 if (x->props.family == family &&
1471 x->props.reqid == reqid &&
1472 x->if_id == if_id &&
1473 (mark & x->mark.m) == x->mark.v &&
1474 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1475 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1476 x->genid++;
1477 }
1478 }
1479
xfrm_state_insert(struct xfrm_state * x)1480 void xfrm_state_insert(struct xfrm_state *x)
1481 {
1482 struct net *net = xs_net(x);
1483
1484 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1485 __xfrm_state_bump_genids(x);
1486 __xfrm_state_insert(x);
1487 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1488 }
1489 EXPORT_SYMBOL(xfrm_state_insert);
1490
1491 /* 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)1492 static struct xfrm_state *__find_acq_core(struct net *net,
1493 const struct xfrm_mark *m,
1494 unsigned short family, u8 mode,
1495 u32 reqid, u32 if_id, u8 proto,
1496 const xfrm_address_t *daddr,
1497 const xfrm_address_t *saddr,
1498 int create)
1499 {
1500 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1501 struct xfrm_state *x;
1502 u32 mark = m->v & m->m;
1503
1504 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1505 if (x->props.reqid != reqid ||
1506 x->props.mode != mode ||
1507 x->props.family != family ||
1508 x->km.state != XFRM_STATE_ACQ ||
1509 x->id.spi != 0 ||
1510 x->id.proto != proto ||
1511 (mark & x->mark.m) != x->mark.v ||
1512 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1513 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1514 continue;
1515
1516 xfrm_state_hold(x);
1517 return x;
1518 }
1519
1520 if (!create)
1521 return NULL;
1522
1523 x = xfrm_state_alloc(net);
1524 if (likely(x)) {
1525 switch (family) {
1526 case AF_INET:
1527 x->sel.daddr.a4 = daddr->a4;
1528 x->sel.saddr.a4 = saddr->a4;
1529 x->sel.prefixlen_d = 32;
1530 x->sel.prefixlen_s = 32;
1531 x->props.saddr.a4 = saddr->a4;
1532 x->id.daddr.a4 = daddr->a4;
1533 break;
1534
1535 case AF_INET6:
1536 x->sel.daddr.in6 = daddr->in6;
1537 x->sel.saddr.in6 = saddr->in6;
1538 x->sel.prefixlen_d = 128;
1539 x->sel.prefixlen_s = 128;
1540 x->props.saddr.in6 = saddr->in6;
1541 x->id.daddr.in6 = daddr->in6;
1542 break;
1543 }
1544
1545 x->km.state = XFRM_STATE_ACQ;
1546 x->id.proto = proto;
1547 x->props.family = family;
1548 x->props.mode = mode;
1549 x->props.reqid = reqid;
1550 x->if_id = if_id;
1551 x->mark.v = m->v;
1552 x->mark.m = m->m;
1553 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1554 xfrm_state_hold(x);
1555 hrtimer_start(&x->mtimer,
1556 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1557 HRTIMER_MODE_REL_SOFT);
1558 list_add(&x->km.all, &net->xfrm.state_all);
1559 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1560 x->xso.type);
1561 h = xfrm_src_hash(net, daddr, saddr, family);
1562 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1563 x->xso.type);
1564
1565 net->xfrm.state_num++;
1566
1567 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1568 }
1569
1570 return x;
1571 }
1572
1573 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1574
xfrm_state_add(struct xfrm_state * x)1575 int xfrm_state_add(struct xfrm_state *x)
1576 {
1577 struct net *net = xs_net(x);
1578 struct xfrm_state *x1, *to_put;
1579 int family;
1580 int err;
1581 u32 mark = x->mark.v & x->mark.m;
1582 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1583
1584 family = x->props.family;
1585
1586 to_put = NULL;
1587
1588 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1589
1590 x1 = __xfrm_state_locate(x, use_spi, family);
1591 if (x1) {
1592 to_put = x1;
1593 x1 = NULL;
1594 err = -EEXIST;
1595 goto out;
1596 }
1597
1598 if (use_spi && x->km.seq) {
1599 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1600 if (x1 && ((x1->id.proto != x->id.proto) ||
1601 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1602 to_put = x1;
1603 x1 = NULL;
1604 }
1605 }
1606
1607 if (use_spi && !x1)
1608 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1609 x->props.reqid, x->if_id, x->id.proto,
1610 &x->id.daddr, &x->props.saddr, 0);
1611
1612 __xfrm_state_bump_genids(x);
1613 __xfrm_state_insert(x);
1614 err = 0;
1615
1616 out:
1617 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1618
1619 if (x1) {
1620 xfrm_state_delete(x1);
1621 xfrm_state_put(x1);
1622 }
1623
1624 if (to_put)
1625 xfrm_state_put(to_put);
1626
1627 return err;
1628 }
1629 EXPORT_SYMBOL(xfrm_state_add);
1630
1631 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1632 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1633 {
1634 struct xfrm_user_sec_ctx *uctx;
1635 int size = sizeof(*uctx) + security->ctx_len;
1636 int err;
1637
1638 uctx = kmalloc(size, GFP_KERNEL);
1639 if (!uctx)
1640 return -ENOMEM;
1641
1642 uctx->exttype = XFRMA_SEC_CTX;
1643 uctx->len = size;
1644 uctx->ctx_doi = security->ctx_doi;
1645 uctx->ctx_alg = security->ctx_alg;
1646 uctx->ctx_len = security->ctx_len;
1647 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1648 err = security_xfrm_state_alloc(x, uctx);
1649 kfree(uctx);
1650 if (err)
1651 return err;
1652
1653 return 0;
1654 }
1655
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1656 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1657 struct xfrm_encap_tmpl *encap)
1658 {
1659 struct net *net = xs_net(orig);
1660 struct xfrm_state *x = xfrm_state_alloc(net);
1661 if (!x)
1662 goto out;
1663
1664 memcpy(&x->id, &orig->id, sizeof(x->id));
1665 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1666 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1667 x->props.mode = orig->props.mode;
1668 x->props.replay_window = orig->props.replay_window;
1669 x->props.reqid = orig->props.reqid;
1670 x->props.family = orig->props.family;
1671 x->props.saddr = orig->props.saddr;
1672
1673 if (orig->aalg) {
1674 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1675 if (!x->aalg)
1676 goto error;
1677 }
1678 x->props.aalgo = orig->props.aalgo;
1679
1680 if (orig->aead) {
1681 x->aead = xfrm_algo_aead_clone(orig->aead);
1682 x->geniv = orig->geniv;
1683 if (!x->aead)
1684 goto error;
1685 }
1686 if (orig->ealg) {
1687 x->ealg = xfrm_algo_clone(orig->ealg);
1688 if (!x->ealg)
1689 goto error;
1690 }
1691 x->props.ealgo = orig->props.ealgo;
1692
1693 if (orig->calg) {
1694 x->calg = xfrm_algo_clone(orig->calg);
1695 if (!x->calg)
1696 goto error;
1697 }
1698 x->props.calgo = orig->props.calgo;
1699
1700 if (encap || orig->encap) {
1701 if (encap)
1702 x->encap = kmemdup(encap, sizeof(*x->encap),
1703 GFP_KERNEL);
1704 else
1705 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1706 GFP_KERNEL);
1707
1708 if (!x->encap)
1709 goto error;
1710 }
1711
1712 if (orig->security)
1713 if (clone_security(x, orig->security))
1714 goto error;
1715
1716 if (orig->coaddr) {
1717 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1718 GFP_KERNEL);
1719 if (!x->coaddr)
1720 goto error;
1721 }
1722
1723 if (orig->replay_esn) {
1724 if (xfrm_replay_clone(x, orig))
1725 goto error;
1726 }
1727
1728 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1729 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1730
1731 x->props.flags = orig->props.flags;
1732 x->props.extra_flags = orig->props.extra_flags;
1733
1734 x->if_id = orig->if_id;
1735 x->tfcpad = orig->tfcpad;
1736 x->replay_maxdiff = orig->replay_maxdiff;
1737 x->replay_maxage = orig->replay_maxage;
1738 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1739 x->km.state = orig->km.state;
1740 x->km.seq = orig->km.seq;
1741 x->replay = orig->replay;
1742 x->preplay = orig->preplay;
1743 x->mapping_maxage = orig->mapping_maxage;
1744 x->lastused = orig->lastused;
1745 x->new_mapping = 0;
1746 x->new_mapping_sport = 0;
1747
1748 return x;
1749
1750 error:
1751 xfrm_state_put(x);
1752 out:
1753 return NULL;
1754 }
1755
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1756 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1757 u32 if_id)
1758 {
1759 unsigned int h;
1760 struct xfrm_state *x = NULL;
1761
1762 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1763
1764 if (m->reqid) {
1765 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1766 m->reqid, m->old_family);
1767 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1768 if (x->props.mode != m->mode ||
1769 x->id.proto != m->proto)
1770 continue;
1771 if (m->reqid && x->props.reqid != m->reqid)
1772 continue;
1773 if (if_id != 0 && x->if_id != if_id)
1774 continue;
1775 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1776 m->old_family) ||
1777 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1778 m->old_family))
1779 continue;
1780 xfrm_state_hold(x);
1781 break;
1782 }
1783 } else {
1784 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1785 m->old_family);
1786 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1787 if (x->props.mode != m->mode ||
1788 x->id.proto != m->proto)
1789 continue;
1790 if (if_id != 0 && x->if_id != if_id)
1791 continue;
1792 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1793 m->old_family) ||
1794 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1795 m->old_family))
1796 continue;
1797 xfrm_state_hold(x);
1798 break;
1799 }
1800 }
1801
1802 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1803
1804 return x;
1805 }
1806 EXPORT_SYMBOL(xfrm_migrate_state_find);
1807
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1808 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1809 struct xfrm_migrate *m,
1810 struct xfrm_encap_tmpl *encap)
1811 {
1812 struct xfrm_state *xc;
1813
1814 xc = xfrm_state_clone(x, encap);
1815 if (!xc)
1816 return NULL;
1817
1818 xc->props.family = m->new_family;
1819
1820 if (xfrm_init_state(xc) < 0)
1821 goto error;
1822
1823 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1824 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1825
1826 /* add state */
1827 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1828 /* a care is needed when the destination address of the
1829 state is to be updated as it is a part of triplet */
1830 xfrm_state_insert(xc);
1831 } else {
1832 if (xfrm_state_add(xc) < 0)
1833 goto error;
1834 }
1835
1836 return xc;
1837 error:
1838 xfrm_state_put(xc);
1839 return NULL;
1840 }
1841 EXPORT_SYMBOL(xfrm_state_migrate);
1842 #endif
1843
xfrm_state_update(struct xfrm_state * x)1844 int xfrm_state_update(struct xfrm_state *x)
1845 {
1846 struct xfrm_state *x1, *to_put;
1847 int err;
1848 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1849 struct net *net = xs_net(x);
1850
1851 to_put = NULL;
1852
1853 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1854 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1855
1856 err = -ESRCH;
1857 if (!x1)
1858 goto out;
1859
1860 if (xfrm_state_kern(x1)) {
1861 to_put = x1;
1862 err = -EEXIST;
1863 goto out;
1864 }
1865
1866 if (x1->km.state == XFRM_STATE_ACQ) {
1867 __xfrm_state_insert(x);
1868 x = NULL;
1869 }
1870 err = 0;
1871
1872 out:
1873 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1874
1875 if (to_put)
1876 xfrm_state_put(to_put);
1877
1878 if (err)
1879 return err;
1880
1881 if (!x) {
1882 xfrm_state_delete(x1);
1883 xfrm_state_put(x1);
1884 return 0;
1885 }
1886
1887 err = -EINVAL;
1888 spin_lock_bh(&x1->lock);
1889 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1890 if (x->encap && x1->encap &&
1891 x->encap->encap_type == x1->encap->encap_type)
1892 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1893 else if (x->encap || x1->encap)
1894 goto fail;
1895
1896 if (x->coaddr && x1->coaddr) {
1897 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1898 }
1899 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1900 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1901 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1902 x1->km.dying = 0;
1903
1904 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1905 HRTIMER_MODE_REL_SOFT);
1906 if (READ_ONCE(x1->curlft.use_time))
1907 xfrm_state_check_expire(x1);
1908
1909 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1910 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1911
1912 if (x->props.smark.m || x->props.smark.v)
1913 x1->props.smark = x->props.smark;
1914
1915 if (x->if_id)
1916 x1->if_id = x->if_id;
1917
1918 __xfrm_state_bump_genids(x1);
1919 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1920 }
1921
1922 err = 0;
1923 x->km.state = XFRM_STATE_DEAD;
1924 __xfrm_state_put(x);
1925 }
1926
1927 fail:
1928 spin_unlock_bh(&x1->lock);
1929
1930 xfrm_state_put(x1);
1931
1932 return err;
1933 }
1934 EXPORT_SYMBOL(xfrm_state_update);
1935
xfrm_state_check_expire(struct xfrm_state * x)1936 int xfrm_state_check_expire(struct xfrm_state *x)
1937 {
1938 xfrm_dev_state_update_curlft(x);
1939
1940 if (!READ_ONCE(x->curlft.use_time))
1941 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds());
1942
1943 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1944 x->curlft.packets >= x->lft.hard_packet_limit) {
1945 x->km.state = XFRM_STATE_EXPIRED;
1946 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1947 return -EINVAL;
1948 }
1949
1950 if (!x->km.dying &&
1951 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1952 x->curlft.packets >= x->lft.soft_packet_limit)) {
1953 x->km.dying = 1;
1954 km_state_expired(x, 0, 0);
1955 }
1956 return 0;
1957 }
1958 EXPORT_SYMBOL(xfrm_state_check_expire);
1959
1960 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1961 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1962 u8 proto, unsigned short family)
1963 {
1964 struct xfrm_state *x;
1965
1966 rcu_read_lock();
1967 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1968 rcu_read_unlock();
1969 return x;
1970 }
1971 EXPORT_SYMBOL(xfrm_state_lookup);
1972
1973 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)1974 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1975 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1976 u8 proto, unsigned short family)
1977 {
1978 struct xfrm_state *x;
1979
1980 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1981 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1982 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1983 return x;
1984 }
1985 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1986
1987 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)1988 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1989 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1990 const xfrm_address_t *saddr, int create, unsigned short family)
1991 {
1992 struct xfrm_state *x;
1993
1994 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1995 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1996 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1997
1998 return x;
1999 }
2000 EXPORT_SYMBOL(xfrm_find_acq);
2001
2002 #ifdef CONFIG_XFRM_SUB_POLICY
2003 #if IS_ENABLED(CONFIG_IPV6)
2004 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
2005 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2006 __xfrm6_sort(void **dst, void **src, int n,
2007 int (*cmp)(const void *p), int maxclass)
2008 {
2009 int count[XFRM_MAX_DEPTH] = { };
2010 int class[XFRM_MAX_DEPTH];
2011 int i;
2012
2013 for (i = 0; i < n; i++) {
2014 int c = cmp(src[i]);
2015
2016 class[i] = c;
2017 count[c]++;
2018 }
2019
2020 for (i = 2; i < maxclass; i++)
2021 count[i] += count[i - 1];
2022
2023 for (i = 0; i < n; i++) {
2024 dst[count[class[i] - 1]++] = src[i];
2025 src[i] = NULL;
2026 }
2027 }
2028
2029 /* Rule for xfrm_state:
2030 *
2031 * rule 1: select IPsec transport except AH
2032 * rule 2: select MIPv6 RO or inbound trigger
2033 * rule 3: select IPsec transport AH
2034 * rule 4: select IPsec tunnel
2035 * rule 5: others
2036 */
__xfrm6_state_sort_cmp(const void * p)2037 static int __xfrm6_state_sort_cmp(const void *p)
2038 {
2039 const struct xfrm_state *v = p;
2040
2041 switch (v->props.mode) {
2042 case XFRM_MODE_TRANSPORT:
2043 if (v->id.proto != IPPROTO_AH)
2044 return 1;
2045 else
2046 return 3;
2047 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2048 case XFRM_MODE_ROUTEOPTIMIZATION:
2049 case XFRM_MODE_IN_TRIGGER:
2050 return 2;
2051 #endif
2052 case XFRM_MODE_TUNNEL:
2053 case XFRM_MODE_BEET:
2054 return 4;
2055 }
2056 return 5;
2057 }
2058
2059 /* Rule for xfrm_tmpl:
2060 *
2061 * rule 1: select IPsec transport
2062 * rule 2: select MIPv6 RO or inbound trigger
2063 * rule 3: select IPsec tunnel
2064 * rule 4: others
2065 */
__xfrm6_tmpl_sort_cmp(const void * p)2066 static int __xfrm6_tmpl_sort_cmp(const void *p)
2067 {
2068 const struct xfrm_tmpl *v = p;
2069
2070 switch (v->mode) {
2071 case XFRM_MODE_TRANSPORT:
2072 return 1;
2073 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2074 case XFRM_MODE_ROUTEOPTIMIZATION:
2075 case XFRM_MODE_IN_TRIGGER:
2076 return 2;
2077 #endif
2078 case XFRM_MODE_TUNNEL:
2079 case XFRM_MODE_BEET:
2080 return 3;
2081 }
2082 return 4;
2083 }
2084 #else
__xfrm6_state_sort_cmp(const void * p)2085 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)2086 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
2087
2088 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2089 __xfrm6_sort(void **dst, void **src, int n,
2090 int (*cmp)(const void *p), int maxclass)
2091 {
2092 int i;
2093
2094 for (i = 0; i < n; i++)
2095 dst[i] = src[i];
2096 }
2097 #endif /* CONFIG_IPV6 */
2098
2099 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)2100 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
2101 unsigned short family)
2102 {
2103 int i;
2104
2105 if (family == AF_INET6)
2106 __xfrm6_sort((void **)dst, (void **)src, n,
2107 __xfrm6_tmpl_sort_cmp, 5);
2108 else
2109 for (i = 0; i < n; i++)
2110 dst[i] = src[i];
2111 }
2112
2113 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)2114 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
2115 unsigned short family)
2116 {
2117 int i;
2118
2119 if (family == AF_INET6)
2120 __xfrm6_sort((void **)dst, (void **)src, n,
2121 __xfrm6_state_sort_cmp, 6);
2122 else
2123 for (i = 0; i < n; i++)
2124 dst[i] = src[i];
2125 }
2126 #endif
2127
2128 /* Silly enough, but I'm lazy to build resolution list */
2129
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2130 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2131 {
2132 unsigned int h = xfrm_seq_hash(net, seq);
2133 struct xfrm_state *x;
2134
2135 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
2136 if (x->km.seq == seq &&
2137 (mark & x->mark.m) == x->mark.v &&
2138 x->km.state == XFRM_STATE_ACQ) {
2139 xfrm_state_hold(x);
2140 return x;
2141 }
2142 }
2143
2144 return NULL;
2145 }
2146
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2147 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2148 {
2149 struct xfrm_state *x;
2150
2151 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2152 x = __xfrm_find_acq_byseq(net, mark, seq);
2153 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2154 return x;
2155 }
2156 EXPORT_SYMBOL(xfrm_find_acq_byseq);
2157
xfrm_get_acqseq(void)2158 u32 xfrm_get_acqseq(void)
2159 {
2160 u32 res;
2161 static atomic_t acqseq;
2162
2163 do {
2164 res = atomic_inc_return(&acqseq);
2165 } while (!res);
2166
2167 return res;
2168 }
2169 EXPORT_SYMBOL(xfrm_get_acqseq);
2170
verify_spi_info(u8 proto,u32 min,u32 max,struct netlink_ext_ack * extack)2171 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
2172 {
2173 switch (proto) {
2174 case IPPROTO_AH:
2175 case IPPROTO_ESP:
2176 break;
2177
2178 case IPPROTO_COMP:
2179 /* IPCOMP spi is 16-bits. */
2180 if (max >= 0x10000) {
2181 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
2182 return -EINVAL;
2183 }
2184 break;
2185
2186 default:
2187 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
2188 return -EINVAL;
2189 }
2190
2191 if (min > max) {
2192 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
2193 return -EINVAL;
2194 }
2195
2196 return 0;
2197 }
2198 EXPORT_SYMBOL(verify_spi_info);
2199
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high,struct netlink_ext_ack * extack)2200 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
2201 struct netlink_ext_ack *extack)
2202 {
2203 struct net *net = xs_net(x);
2204 unsigned int h;
2205 struct xfrm_state *x0;
2206 int err = -ENOENT;
2207 __be32 minspi = htonl(low);
2208 __be32 maxspi = htonl(high);
2209 __be32 newspi = 0;
2210 u32 mark = x->mark.v & x->mark.m;
2211
2212 spin_lock_bh(&x->lock);
2213 if (x->km.state == XFRM_STATE_DEAD) {
2214 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
2215 goto unlock;
2216 }
2217
2218 err = 0;
2219 if (x->id.spi)
2220 goto unlock;
2221
2222 err = -ENOENT;
2223
2224 if (minspi == maxspi) {
2225 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2226 if (x0) {
2227 NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
2228 xfrm_state_put(x0);
2229 goto unlock;
2230 }
2231 newspi = minspi;
2232 } else {
2233 u32 spi = 0;
2234 for (h = 0; h < high-low+1; h++) {
2235 spi = get_random_u32_inclusive(low, high);
2236 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2237 if (x0 == NULL) {
2238 newspi = htonl(spi);
2239 break;
2240 }
2241 xfrm_state_put(x0);
2242 }
2243 }
2244 if (newspi) {
2245 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2246 x->id.spi = newspi;
2247 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2248 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
2249 x->xso.type);
2250 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2251
2252 err = 0;
2253 } else {
2254 NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
2255 }
2256
2257 unlock:
2258 spin_unlock_bh(&x->lock);
2259
2260 return err;
2261 }
2262 EXPORT_SYMBOL(xfrm_alloc_spi);
2263
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2264 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2265 struct xfrm_address_filter *filter)
2266 {
2267 if (filter) {
2268 if ((filter->family == AF_INET ||
2269 filter->family == AF_INET6) &&
2270 x->props.family != filter->family)
2271 return false;
2272
2273 return addr_match(&x->props.saddr, &filter->saddr,
2274 filter->splen) &&
2275 addr_match(&x->id.daddr, &filter->daddr,
2276 filter->dplen);
2277 }
2278 return true;
2279 }
2280
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2281 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2282 int (*func)(struct xfrm_state *, int, void*),
2283 void *data)
2284 {
2285 struct xfrm_state *state;
2286 struct xfrm_state_walk *x;
2287 int err = 0;
2288
2289 if (walk->seq != 0 && list_empty(&walk->all))
2290 return 0;
2291
2292 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2293 if (list_empty(&walk->all))
2294 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2295 else
2296 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2297 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2298 if (x->state == XFRM_STATE_DEAD)
2299 continue;
2300 state = container_of(x, struct xfrm_state, km);
2301 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2302 continue;
2303 if (!__xfrm_state_filter_match(state, walk->filter))
2304 continue;
2305 err = func(state, walk->seq, data);
2306 if (err) {
2307 list_move_tail(&walk->all, &x->all);
2308 goto out;
2309 }
2310 walk->seq++;
2311 }
2312 if (walk->seq == 0) {
2313 err = -ENOENT;
2314 goto out;
2315 }
2316 list_del_init(&walk->all);
2317 out:
2318 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2319 return err;
2320 }
2321 EXPORT_SYMBOL(xfrm_state_walk);
2322
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2323 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2324 struct xfrm_address_filter *filter)
2325 {
2326 INIT_LIST_HEAD(&walk->all);
2327 walk->proto = proto;
2328 walk->state = XFRM_STATE_DEAD;
2329 walk->seq = 0;
2330 walk->filter = filter;
2331 }
2332 EXPORT_SYMBOL(xfrm_state_walk_init);
2333
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2334 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2335 {
2336 kfree(walk->filter);
2337
2338 if (list_empty(&walk->all))
2339 return;
2340
2341 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2342 list_del(&walk->all);
2343 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2344 }
2345 EXPORT_SYMBOL(xfrm_state_walk_done);
2346
xfrm_replay_timer_handler(struct timer_list * t)2347 static void xfrm_replay_timer_handler(struct timer_list *t)
2348 {
2349 struct xfrm_state *x = from_timer(x, t, rtimer);
2350
2351 spin_lock(&x->lock);
2352
2353 if (x->km.state == XFRM_STATE_VALID) {
2354 if (xfrm_aevent_is_on(xs_net(x)))
2355 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2356 else
2357 x->xflags |= XFRM_TIME_DEFER;
2358 }
2359
2360 spin_unlock(&x->lock);
2361 }
2362
2363 static LIST_HEAD(xfrm_km_list);
2364
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2365 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2366 {
2367 struct xfrm_mgr *km;
2368
2369 rcu_read_lock();
2370 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2371 if (km->notify_policy)
2372 km->notify_policy(xp, dir, c);
2373 rcu_read_unlock();
2374 }
2375
km_state_notify(struct xfrm_state * x,const struct km_event * c)2376 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2377 {
2378 struct xfrm_mgr *km;
2379 rcu_read_lock();
2380 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2381 if (km->notify)
2382 km->notify(x, c);
2383 rcu_read_unlock();
2384 }
2385
2386 EXPORT_SYMBOL(km_policy_notify);
2387 EXPORT_SYMBOL(km_state_notify);
2388
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2389 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2390 {
2391 struct km_event c;
2392
2393 c.data.hard = hard;
2394 c.portid = portid;
2395 c.event = XFRM_MSG_EXPIRE;
2396 km_state_notify(x, &c);
2397 }
2398
2399 EXPORT_SYMBOL(km_state_expired);
2400 /*
2401 * We send to all registered managers regardless of failure
2402 * We are happy with one success
2403 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2404 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2405 {
2406 int err = -EINVAL, acqret;
2407 struct xfrm_mgr *km;
2408
2409 rcu_read_lock();
2410 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2411 acqret = km->acquire(x, t, pol);
2412 if (!acqret)
2413 err = acqret;
2414 }
2415 rcu_read_unlock();
2416 return err;
2417 }
2418 EXPORT_SYMBOL(km_query);
2419
__km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2420 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2421 {
2422 int err = -EINVAL;
2423 struct xfrm_mgr *km;
2424
2425 rcu_read_lock();
2426 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2427 if (km->new_mapping)
2428 err = km->new_mapping(x, ipaddr, sport);
2429 if (!err)
2430 break;
2431 }
2432 rcu_read_unlock();
2433 return err;
2434 }
2435
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2436 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2437 {
2438 int ret = 0;
2439
2440 if (x->mapping_maxage) {
2441 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2442 x->new_mapping_sport != sport) {
2443 x->new_mapping_sport = sport;
2444 x->new_mapping = jiffies / HZ;
2445 ret = __km_new_mapping(x, ipaddr, sport);
2446 }
2447 } else {
2448 ret = __km_new_mapping(x, ipaddr, sport);
2449 }
2450
2451 return ret;
2452 }
2453 EXPORT_SYMBOL(km_new_mapping);
2454
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2455 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2456 {
2457 struct km_event c;
2458
2459 c.data.hard = hard;
2460 c.portid = portid;
2461 c.event = XFRM_MSG_POLEXPIRE;
2462 km_policy_notify(pol, dir, &c);
2463 }
2464 EXPORT_SYMBOL(km_policy_expired);
2465
2466 #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)2467 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2468 const struct xfrm_migrate *m, int num_migrate,
2469 const struct xfrm_kmaddress *k,
2470 const struct xfrm_encap_tmpl *encap)
2471 {
2472 int err = -EINVAL;
2473 int ret;
2474 struct xfrm_mgr *km;
2475
2476 rcu_read_lock();
2477 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2478 if (km->migrate) {
2479 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2480 encap);
2481 if (!ret)
2482 err = ret;
2483 }
2484 }
2485 rcu_read_unlock();
2486 return err;
2487 }
2488 EXPORT_SYMBOL(km_migrate);
2489 #endif
2490
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2491 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2492 {
2493 int err = -EINVAL;
2494 int ret;
2495 struct xfrm_mgr *km;
2496
2497 rcu_read_lock();
2498 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2499 if (km->report) {
2500 ret = km->report(net, proto, sel, addr);
2501 if (!ret)
2502 err = ret;
2503 }
2504 }
2505 rcu_read_unlock();
2506 return err;
2507 }
2508 EXPORT_SYMBOL(km_report);
2509
km_is_alive(const struct km_event * c)2510 static bool km_is_alive(const struct km_event *c)
2511 {
2512 struct xfrm_mgr *km;
2513 bool is_alive = false;
2514
2515 rcu_read_lock();
2516 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2517 if (km->is_alive && km->is_alive(c)) {
2518 is_alive = true;
2519 break;
2520 }
2521 }
2522 rcu_read_unlock();
2523
2524 return is_alive;
2525 }
2526
2527 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2528 static DEFINE_SPINLOCK(xfrm_translator_lock);
2529 static struct xfrm_translator __rcu *xfrm_translator;
2530
xfrm_get_translator(void)2531 struct xfrm_translator *xfrm_get_translator(void)
2532 {
2533 struct xfrm_translator *xtr;
2534
2535 rcu_read_lock();
2536 xtr = rcu_dereference(xfrm_translator);
2537 if (unlikely(!xtr))
2538 goto out;
2539 if (!try_module_get(xtr->owner))
2540 xtr = NULL;
2541 out:
2542 rcu_read_unlock();
2543 return xtr;
2544 }
2545 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2546
xfrm_put_translator(struct xfrm_translator * xtr)2547 void xfrm_put_translator(struct xfrm_translator *xtr)
2548 {
2549 module_put(xtr->owner);
2550 }
2551 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2552
xfrm_register_translator(struct xfrm_translator * xtr)2553 int xfrm_register_translator(struct xfrm_translator *xtr)
2554 {
2555 int err = 0;
2556
2557 spin_lock_bh(&xfrm_translator_lock);
2558 if (unlikely(xfrm_translator != NULL))
2559 err = -EEXIST;
2560 else
2561 rcu_assign_pointer(xfrm_translator, xtr);
2562 spin_unlock_bh(&xfrm_translator_lock);
2563
2564 return err;
2565 }
2566 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2567
xfrm_unregister_translator(struct xfrm_translator * xtr)2568 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2569 {
2570 int err = 0;
2571
2572 spin_lock_bh(&xfrm_translator_lock);
2573 if (likely(xfrm_translator != NULL)) {
2574 if (rcu_access_pointer(xfrm_translator) != xtr)
2575 err = -EINVAL;
2576 else
2577 RCU_INIT_POINTER(xfrm_translator, NULL);
2578 }
2579 spin_unlock_bh(&xfrm_translator_lock);
2580 synchronize_rcu();
2581
2582 return err;
2583 }
2584 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2585 #endif
2586
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2587 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2588 {
2589 int err;
2590 u8 *data;
2591 struct xfrm_mgr *km;
2592 struct xfrm_policy *pol = NULL;
2593
2594 if (sockptr_is_null(optval) && !optlen) {
2595 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2596 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2597 __sk_dst_reset(sk);
2598 return 0;
2599 }
2600
2601 if (optlen <= 0 || optlen > PAGE_SIZE)
2602 return -EMSGSIZE;
2603
2604 data = memdup_sockptr(optval, optlen);
2605 if (IS_ERR(data))
2606 return PTR_ERR(data);
2607
2608 if (in_compat_syscall()) {
2609 struct xfrm_translator *xtr = xfrm_get_translator();
2610
2611 if (!xtr) {
2612 kfree(data);
2613 return -EOPNOTSUPP;
2614 }
2615
2616 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2617 xfrm_put_translator(xtr);
2618 if (err) {
2619 kfree(data);
2620 return err;
2621 }
2622 }
2623
2624 err = -EINVAL;
2625 rcu_read_lock();
2626 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2627 pol = km->compile_policy(sk, optname, data,
2628 optlen, &err);
2629 if (err >= 0)
2630 break;
2631 }
2632 rcu_read_unlock();
2633
2634 if (err >= 0) {
2635 xfrm_sk_policy_insert(sk, err, pol);
2636 xfrm_pol_put(pol);
2637 __sk_dst_reset(sk);
2638 err = 0;
2639 }
2640
2641 kfree(data);
2642 return err;
2643 }
2644 EXPORT_SYMBOL(xfrm_user_policy);
2645
2646 static DEFINE_SPINLOCK(xfrm_km_lock);
2647
xfrm_register_km(struct xfrm_mgr * km)2648 void xfrm_register_km(struct xfrm_mgr *km)
2649 {
2650 spin_lock_bh(&xfrm_km_lock);
2651 list_add_tail_rcu(&km->list, &xfrm_km_list);
2652 spin_unlock_bh(&xfrm_km_lock);
2653 }
2654 EXPORT_SYMBOL(xfrm_register_km);
2655
xfrm_unregister_km(struct xfrm_mgr * km)2656 void xfrm_unregister_km(struct xfrm_mgr *km)
2657 {
2658 spin_lock_bh(&xfrm_km_lock);
2659 list_del_rcu(&km->list);
2660 spin_unlock_bh(&xfrm_km_lock);
2661 synchronize_rcu();
2662 }
2663 EXPORT_SYMBOL(xfrm_unregister_km);
2664
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2665 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2666 {
2667 int err = 0;
2668
2669 if (WARN_ON(afinfo->family >= NPROTO))
2670 return -EAFNOSUPPORT;
2671
2672 spin_lock_bh(&xfrm_state_afinfo_lock);
2673 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2674 err = -EEXIST;
2675 else
2676 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2677 spin_unlock_bh(&xfrm_state_afinfo_lock);
2678 return err;
2679 }
2680 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2681
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2682 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2683 {
2684 int err = 0, family = afinfo->family;
2685
2686 if (WARN_ON(family >= NPROTO))
2687 return -EAFNOSUPPORT;
2688
2689 spin_lock_bh(&xfrm_state_afinfo_lock);
2690 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2691 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2692 err = -EINVAL;
2693 else
2694 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2695 }
2696 spin_unlock_bh(&xfrm_state_afinfo_lock);
2697 synchronize_rcu();
2698 return err;
2699 }
2700 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2701
xfrm_state_afinfo_get_rcu(unsigned int family)2702 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2703 {
2704 if (unlikely(family >= NPROTO))
2705 return NULL;
2706
2707 return rcu_dereference(xfrm_state_afinfo[family]);
2708 }
2709 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2710
xfrm_state_get_afinfo(unsigned int family)2711 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2712 {
2713 struct xfrm_state_afinfo *afinfo;
2714 if (unlikely(family >= NPROTO))
2715 return NULL;
2716 rcu_read_lock();
2717 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2718 if (unlikely(!afinfo))
2719 rcu_read_unlock();
2720 return afinfo;
2721 }
2722
xfrm_flush_gc(void)2723 void xfrm_flush_gc(void)
2724 {
2725 flush_work(&xfrm_state_gc_work);
2726 }
2727 EXPORT_SYMBOL(xfrm_flush_gc);
2728
2729 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2730 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2731 {
2732 if (x->tunnel) {
2733 struct xfrm_state *t = x->tunnel;
2734
2735 if (atomic_read(&t->tunnel_users) == 2)
2736 xfrm_state_delete(t);
2737 atomic_dec(&t->tunnel_users);
2738 xfrm_state_put_sync(t);
2739 x->tunnel = NULL;
2740 }
2741 }
2742 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2743
xfrm_state_mtu(struct xfrm_state * x,int mtu)2744 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2745 {
2746 const struct xfrm_type *type = READ_ONCE(x->type);
2747 struct crypto_aead *aead;
2748 u32 blksize, net_adj = 0;
2749
2750 if (x->km.state != XFRM_STATE_VALID ||
2751 !type || type->proto != IPPROTO_ESP)
2752 return mtu - x->props.header_len;
2753
2754 aead = x->data;
2755 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2756
2757 switch (x->props.mode) {
2758 case XFRM_MODE_TRANSPORT:
2759 case XFRM_MODE_BEET:
2760 if (x->props.family == AF_INET)
2761 net_adj = sizeof(struct iphdr);
2762 else if (x->props.family == AF_INET6)
2763 net_adj = sizeof(struct ipv6hdr);
2764 break;
2765 case XFRM_MODE_TUNNEL:
2766 break;
2767 default:
2768 WARN_ON_ONCE(1);
2769 break;
2770 }
2771
2772 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2773 net_adj) & ~(blksize - 1)) + net_adj - 2;
2774 }
2775 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2776
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload,struct netlink_ext_ack * extack)2777 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2778 struct netlink_ext_ack *extack)
2779 {
2780 const struct xfrm_mode *inner_mode;
2781 const struct xfrm_mode *outer_mode;
2782 int family = x->props.family;
2783 int err;
2784
2785 if (family == AF_INET &&
2786 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2787 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2788
2789 err = -EPROTONOSUPPORT;
2790
2791 if (x->sel.family != AF_UNSPEC) {
2792 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2793 if (inner_mode == NULL) {
2794 NL_SET_ERR_MSG(extack, "Requested mode not found");
2795 goto error;
2796 }
2797
2798 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2799 family != x->sel.family) {
2800 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
2801 goto error;
2802 }
2803
2804 x->inner_mode = *inner_mode;
2805 } else {
2806 const struct xfrm_mode *inner_mode_iaf;
2807 int iafamily = AF_INET;
2808
2809 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2810 if (inner_mode == NULL) {
2811 NL_SET_ERR_MSG(extack, "Requested mode not found");
2812 goto error;
2813 }
2814
2815 x->inner_mode = *inner_mode;
2816
2817 if (x->props.family == AF_INET)
2818 iafamily = AF_INET6;
2819
2820 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2821 if (inner_mode_iaf) {
2822 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2823 x->inner_mode_iaf = *inner_mode_iaf;
2824 }
2825 }
2826
2827 x->type = xfrm_get_type(x->id.proto, family);
2828 if (x->type == NULL) {
2829 NL_SET_ERR_MSG(extack, "Requested type not found");
2830 goto error;
2831 }
2832
2833 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2834
2835 err = x->type->init_state(x, extack);
2836 if (err)
2837 goto error;
2838
2839 outer_mode = xfrm_get_mode(x->props.mode, family);
2840 if (!outer_mode) {
2841 NL_SET_ERR_MSG(extack, "Requested mode not found");
2842 err = -EPROTONOSUPPORT;
2843 goto error;
2844 }
2845
2846 x->outer_mode = *outer_mode;
2847 if (init_replay) {
2848 err = xfrm_init_replay(x, extack);
2849 if (err)
2850 goto error;
2851 }
2852
2853 error:
2854 return err;
2855 }
2856
2857 EXPORT_SYMBOL(__xfrm_init_state);
2858
xfrm_init_state(struct xfrm_state * x)2859 int xfrm_init_state(struct xfrm_state *x)
2860 {
2861 int err;
2862
2863 err = __xfrm_init_state(x, true, false, NULL);
2864 if (!err)
2865 x->km.state = XFRM_STATE_VALID;
2866
2867 return err;
2868 }
2869
2870 EXPORT_SYMBOL(xfrm_init_state);
2871
xfrm_state_init(struct net * net)2872 int __net_init xfrm_state_init(struct net *net)
2873 {
2874 unsigned int sz;
2875
2876 if (net_eq(net, &init_net))
2877 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2878 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2879
2880 INIT_LIST_HEAD(&net->xfrm.state_all);
2881
2882 sz = sizeof(struct hlist_head) * 8;
2883
2884 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2885 if (!net->xfrm.state_bydst)
2886 goto out_bydst;
2887 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2888 if (!net->xfrm.state_bysrc)
2889 goto out_bysrc;
2890 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2891 if (!net->xfrm.state_byspi)
2892 goto out_byspi;
2893 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2894 if (!net->xfrm.state_byseq)
2895 goto out_byseq;
2896 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2897
2898 net->xfrm.state_num = 0;
2899 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2900 spin_lock_init(&net->xfrm.xfrm_state_lock);
2901 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2902 &net->xfrm.xfrm_state_lock);
2903 return 0;
2904
2905 out_byseq:
2906 xfrm_hash_free(net->xfrm.state_byspi, sz);
2907 out_byspi:
2908 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2909 out_bysrc:
2910 xfrm_hash_free(net->xfrm.state_bydst, sz);
2911 out_bydst:
2912 return -ENOMEM;
2913 }
2914
xfrm_state_fini(struct net * net)2915 void xfrm_state_fini(struct net *net)
2916 {
2917 unsigned int sz;
2918
2919 flush_work(&net->xfrm.state_hash_work);
2920 flush_work(&xfrm_state_gc_work);
2921 xfrm_state_flush(net, 0, false, true);
2922
2923 WARN_ON(!list_empty(&net->xfrm.state_all));
2924
2925 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2926 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2927 xfrm_hash_free(net->xfrm.state_byseq, sz);
2928 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2929 xfrm_hash_free(net->xfrm.state_byspi, sz);
2930 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2931 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2932 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2933 xfrm_hash_free(net->xfrm.state_bydst, sz);
2934 }
2935
2936 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2937 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2938 struct audit_buffer *audit_buf)
2939 {
2940 struct xfrm_sec_ctx *ctx = x->security;
2941 u32 spi = ntohl(x->id.spi);
2942
2943 if (ctx)
2944 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2945 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2946
2947 switch (x->props.family) {
2948 case AF_INET:
2949 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2950 &x->props.saddr.a4, &x->id.daddr.a4);
2951 break;
2952 case AF_INET6:
2953 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2954 x->props.saddr.a6, x->id.daddr.a6);
2955 break;
2956 }
2957
2958 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2959 }
2960
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2961 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2962 struct audit_buffer *audit_buf)
2963 {
2964 const struct iphdr *iph4;
2965 const struct ipv6hdr *iph6;
2966
2967 switch (family) {
2968 case AF_INET:
2969 iph4 = ip_hdr(skb);
2970 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2971 &iph4->saddr, &iph4->daddr);
2972 break;
2973 case AF_INET6:
2974 iph6 = ipv6_hdr(skb);
2975 audit_log_format(audit_buf,
2976 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2977 &iph6->saddr, &iph6->daddr,
2978 iph6->flow_lbl[0] & 0x0f,
2979 iph6->flow_lbl[1],
2980 iph6->flow_lbl[2]);
2981 break;
2982 }
2983 }
2984
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2985 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2986 {
2987 struct audit_buffer *audit_buf;
2988
2989 audit_buf = xfrm_audit_start("SAD-add");
2990 if (audit_buf == NULL)
2991 return;
2992 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2993 xfrm_audit_helper_sainfo(x, audit_buf);
2994 audit_log_format(audit_buf, " res=%u", result);
2995 audit_log_end(audit_buf);
2996 }
2997 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2998
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)2999 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
3000 {
3001 struct audit_buffer *audit_buf;
3002
3003 audit_buf = xfrm_audit_start("SAD-delete");
3004 if (audit_buf == NULL)
3005 return;
3006 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3007 xfrm_audit_helper_sainfo(x, audit_buf);
3008 audit_log_format(audit_buf, " res=%u", result);
3009 audit_log_end(audit_buf);
3010 }
3011 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
3012
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)3013 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
3014 struct sk_buff *skb)
3015 {
3016 struct audit_buffer *audit_buf;
3017 u32 spi;
3018
3019 audit_buf = xfrm_audit_start("SA-replay-overflow");
3020 if (audit_buf == NULL)
3021 return;
3022 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3023 /* don't record the sequence number because it's inherent in this kind
3024 * of audit message */
3025 spi = ntohl(x->id.spi);
3026 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
3027 audit_log_end(audit_buf);
3028 }
3029 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
3030
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)3031 void xfrm_audit_state_replay(struct xfrm_state *x,
3032 struct sk_buff *skb, __be32 net_seq)
3033 {
3034 struct audit_buffer *audit_buf;
3035 u32 spi;
3036
3037 audit_buf = xfrm_audit_start("SA-replayed-pkt");
3038 if (audit_buf == NULL)
3039 return;
3040 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3041 spi = ntohl(x->id.spi);
3042 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3043 spi, spi, ntohl(net_seq));
3044 audit_log_end(audit_buf);
3045 }
3046 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
3047
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)3048 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
3049 {
3050 struct audit_buffer *audit_buf;
3051
3052 audit_buf = xfrm_audit_start("SA-notfound");
3053 if (audit_buf == NULL)
3054 return;
3055 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3056 audit_log_end(audit_buf);
3057 }
3058 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
3059
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)3060 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
3061 __be32 net_spi, __be32 net_seq)
3062 {
3063 struct audit_buffer *audit_buf;
3064 u32 spi;
3065
3066 audit_buf = xfrm_audit_start("SA-notfound");
3067 if (audit_buf == NULL)
3068 return;
3069 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3070 spi = ntohl(net_spi);
3071 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3072 spi, spi, ntohl(net_seq));
3073 audit_log_end(audit_buf);
3074 }
3075 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
3076
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)3077 void xfrm_audit_state_icvfail(struct xfrm_state *x,
3078 struct sk_buff *skb, u8 proto)
3079 {
3080 struct audit_buffer *audit_buf;
3081 __be32 net_spi;
3082 __be32 net_seq;
3083
3084 audit_buf = xfrm_audit_start("SA-icv-failure");
3085 if (audit_buf == NULL)
3086 return;
3087 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3088 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
3089 u32 spi = ntohl(net_spi);
3090 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3091 spi, spi, ntohl(net_seq));
3092 }
3093 audit_log_end(audit_buf);
3094 }
3095 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
3096 #endif /* CONFIG_AUDITSYSCALL */
3097