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_hold(xso->dev, &xso->dev_tracker, GFP_ATOMIC);
1277 error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
1278 if (error) {
1279 xso->dir = 0;
1280 netdev_put(xso->dev, &xso->dev_tracker);
1281 xso->dev = NULL;
1282 xso->real_dev = NULL;
1283 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1284 x->km.state = XFRM_STATE_DEAD;
1285 to_put = x;
1286 x = NULL;
1287 goto out;
1288 }
1289 }
1290 #endif
1291 if (km_query(x, tmpl, pol) == 0) {
1292 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1293 x->km.state = XFRM_STATE_ACQ;
1294 list_add(&x->km.all, &net->xfrm.state_all);
1295 XFRM_STATE_INSERT(bydst, &x->bydst,
1296 net->xfrm.state_bydst + h,
1297 x->xso.type);
1298 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1299 XFRM_STATE_INSERT(bysrc, &x->bysrc,
1300 net->xfrm.state_bysrc + h,
1301 x->xso.type);
1302 if (x->id.spi) {
1303 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1304 XFRM_STATE_INSERT(byspi, &x->byspi,
1305 net->xfrm.state_byspi + h,
1306 x->xso.type);
1307 }
1308 if (x->km.seq) {
1309 h = xfrm_seq_hash(net, x->km.seq);
1310 XFRM_STATE_INSERT(byseq, &x->byseq,
1311 net->xfrm.state_byseq + h,
1312 x->xso.type);
1313 }
1314 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1315 hrtimer_start(&x->mtimer,
1316 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1317 HRTIMER_MODE_REL_SOFT);
1318 net->xfrm.state_num++;
1319 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1320 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1321 } else {
1322 #ifdef CONFIG_XFRM_OFFLOAD
1323 struct xfrm_dev_offload *xso = &x->xso;
1324
1325 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) {
1326 xfrm_dev_state_delete(x);
1327 xfrm_dev_state_free(x);
1328 }
1329 #endif
1330 x->km.state = XFRM_STATE_DEAD;
1331 to_put = x;
1332 x = NULL;
1333 error = -ESRCH;
1334 }
1335 }
1336 out:
1337 if (x) {
1338 if (!xfrm_state_hold_rcu(x)) {
1339 *err = -EAGAIN;
1340 x = NULL;
1341 }
1342 } else {
1343 *err = acquire_in_progress ? -EAGAIN : error;
1344 }
1345 rcu_read_unlock();
1346 if (to_put)
1347 xfrm_state_put(to_put);
1348
1349 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1350 *err = -EAGAIN;
1351 if (x) {
1352 xfrm_state_put(x);
1353 x = NULL;
1354 }
1355 }
1356
1357 return x;
1358 }
1359
1360 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)1361 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1362 xfrm_address_t *daddr, xfrm_address_t *saddr,
1363 unsigned short family, u8 mode, u8 proto, u32 reqid)
1364 {
1365 unsigned int h;
1366 struct xfrm_state *rx = NULL, *x = NULL;
1367
1368 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1369 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1370 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1371 if (x->props.family == family &&
1372 x->props.reqid == reqid &&
1373 (mark & x->mark.m) == x->mark.v &&
1374 x->if_id == if_id &&
1375 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1376 xfrm_state_addr_check(x, daddr, saddr, family) &&
1377 mode == x->props.mode &&
1378 proto == x->id.proto &&
1379 x->km.state == XFRM_STATE_VALID) {
1380 rx = x;
1381 break;
1382 }
1383 }
1384
1385 if (rx)
1386 xfrm_state_hold(rx);
1387 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1388
1389
1390 return rx;
1391 }
1392 EXPORT_SYMBOL(xfrm_stateonly_find);
1393
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1394 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1395 unsigned short family)
1396 {
1397 struct xfrm_state *x;
1398 struct xfrm_state_walk *w;
1399
1400 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1401 list_for_each_entry(w, &net->xfrm.state_all, all) {
1402 x = container_of(w, struct xfrm_state, km);
1403 if (x->props.family != family ||
1404 x->id.spi != spi)
1405 continue;
1406
1407 xfrm_state_hold(x);
1408 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1409 return x;
1410 }
1411 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1412 return NULL;
1413 }
1414 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1415
__xfrm_state_insert(struct xfrm_state * x)1416 static void __xfrm_state_insert(struct xfrm_state *x)
1417 {
1418 struct net *net = xs_net(x);
1419 unsigned int h;
1420
1421 list_add(&x->km.all, &net->xfrm.state_all);
1422
1423 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1424 x->props.reqid, x->props.family);
1425 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1426 x->xso.type);
1427
1428 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1429 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1430 x->xso.type);
1431
1432 if (x->id.spi) {
1433 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1434 x->props.family);
1435
1436 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
1437 x->xso.type);
1438 }
1439
1440 if (x->km.seq) {
1441 h = xfrm_seq_hash(net, x->km.seq);
1442
1443 XFRM_STATE_INSERT(byseq, &x->byseq, net->xfrm.state_byseq + h,
1444 x->xso.type);
1445 }
1446
1447 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1448 if (x->replay_maxage)
1449 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1450
1451 net->xfrm.state_num++;
1452
1453 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1454 }
1455
1456 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1457 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1458 {
1459 struct net *net = xs_net(xnew);
1460 unsigned short family = xnew->props.family;
1461 u32 reqid = xnew->props.reqid;
1462 struct xfrm_state *x;
1463 unsigned int h;
1464 u32 mark = xnew->mark.v & xnew->mark.m;
1465 u32 if_id = xnew->if_id;
1466
1467 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1468 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1469 if (x->props.family == family &&
1470 x->props.reqid == reqid &&
1471 x->if_id == if_id &&
1472 (mark & x->mark.m) == x->mark.v &&
1473 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1474 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1475 x->genid++;
1476 }
1477 }
1478
xfrm_state_insert(struct xfrm_state * x)1479 void xfrm_state_insert(struct xfrm_state *x)
1480 {
1481 struct net *net = xs_net(x);
1482
1483 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1484 __xfrm_state_bump_genids(x);
1485 __xfrm_state_insert(x);
1486 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1487 }
1488 EXPORT_SYMBOL(xfrm_state_insert);
1489
1490 /* 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)1491 static struct xfrm_state *__find_acq_core(struct net *net,
1492 const struct xfrm_mark *m,
1493 unsigned short family, u8 mode,
1494 u32 reqid, u32 if_id, u8 proto,
1495 const xfrm_address_t *daddr,
1496 const xfrm_address_t *saddr,
1497 int create)
1498 {
1499 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1500 struct xfrm_state *x;
1501 u32 mark = m->v & m->m;
1502
1503 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1504 if (x->props.reqid != reqid ||
1505 x->props.mode != mode ||
1506 x->props.family != family ||
1507 x->km.state != XFRM_STATE_ACQ ||
1508 x->id.spi != 0 ||
1509 x->id.proto != proto ||
1510 (mark & x->mark.m) != x->mark.v ||
1511 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1512 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1513 continue;
1514
1515 xfrm_state_hold(x);
1516 return x;
1517 }
1518
1519 if (!create)
1520 return NULL;
1521
1522 x = xfrm_state_alloc(net);
1523 if (likely(x)) {
1524 switch (family) {
1525 case AF_INET:
1526 x->sel.daddr.a4 = daddr->a4;
1527 x->sel.saddr.a4 = saddr->a4;
1528 x->sel.prefixlen_d = 32;
1529 x->sel.prefixlen_s = 32;
1530 x->props.saddr.a4 = saddr->a4;
1531 x->id.daddr.a4 = daddr->a4;
1532 break;
1533
1534 case AF_INET6:
1535 x->sel.daddr.in6 = daddr->in6;
1536 x->sel.saddr.in6 = saddr->in6;
1537 x->sel.prefixlen_d = 128;
1538 x->sel.prefixlen_s = 128;
1539 x->props.saddr.in6 = saddr->in6;
1540 x->id.daddr.in6 = daddr->in6;
1541 break;
1542 }
1543
1544 x->km.state = XFRM_STATE_ACQ;
1545 x->id.proto = proto;
1546 x->props.family = family;
1547 x->props.mode = mode;
1548 x->props.reqid = reqid;
1549 x->if_id = if_id;
1550 x->mark.v = m->v;
1551 x->mark.m = m->m;
1552 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1553 xfrm_state_hold(x);
1554 hrtimer_start(&x->mtimer,
1555 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1556 HRTIMER_MODE_REL_SOFT);
1557 list_add(&x->km.all, &net->xfrm.state_all);
1558 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1559 x->xso.type);
1560 h = xfrm_src_hash(net, daddr, saddr, family);
1561 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1562 x->xso.type);
1563
1564 net->xfrm.state_num++;
1565
1566 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1567 }
1568
1569 return x;
1570 }
1571
1572 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1573
xfrm_state_add(struct xfrm_state * x)1574 int xfrm_state_add(struct xfrm_state *x)
1575 {
1576 struct net *net = xs_net(x);
1577 struct xfrm_state *x1, *to_put;
1578 int family;
1579 int err;
1580 u32 mark = x->mark.v & x->mark.m;
1581 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1582
1583 family = x->props.family;
1584
1585 to_put = NULL;
1586
1587 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1588
1589 x1 = __xfrm_state_locate(x, use_spi, family);
1590 if (x1) {
1591 to_put = x1;
1592 x1 = NULL;
1593 err = -EEXIST;
1594 goto out;
1595 }
1596
1597 if (use_spi && x->km.seq) {
1598 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1599 if (x1 && ((x1->id.proto != x->id.proto) ||
1600 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1601 to_put = x1;
1602 x1 = NULL;
1603 }
1604 }
1605
1606 if (use_spi && !x1)
1607 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1608 x->props.reqid, x->if_id, x->id.proto,
1609 &x->id.daddr, &x->props.saddr, 0);
1610
1611 __xfrm_state_bump_genids(x);
1612 __xfrm_state_insert(x);
1613 err = 0;
1614
1615 out:
1616 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1617
1618 if (x1) {
1619 xfrm_state_delete(x1);
1620 xfrm_state_put(x1);
1621 }
1622
1623 if (to_put)
1624 xfrm_state_put(to_put);
1625
1626 return err;
1627 }
1628 EXPORT_SYMBOL(xfrm_state_add);
1629
1630 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1631 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1632 {
1633 struct xfrm_user_sec_ctx *uctx;
1634 int size = sizeof(*uctx) + security->ctx_len;
1635 int err;
1636
1637 uctx = kmalloc(size, GFP_KERNEL);
1638 if (!uctx)
1639 return -ENOMEM;
1640
1641 uctx->exttype = XFRMA_SEC_CTX;
1642 uctx->len = size;
1643 uctx->ctx_doi = security->ctx_doi;
1644 uctx->ctx_alg = security->ctx_alg;
1645 uctx->ctx_len = security->ctx_len;
1646 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1647 err = security_xfrm_state_alloc(x, uctx);
1648 kfree(uctx);
1649 if (err)
1650 return err;
1651
1652 return 0;
1653 }
1654
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1655 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1656 struct xfrm_encap_tmpl *encap)
1657 {
1658 struct net *net = xs_net(orig);
1659 struct xfrm_state *x = xfrm_state_alloc(net);
1660 if (!x)
1661 goto out;
1662
1663 memcpy(&x->id, &orig->id, sizeof(x->id));
1664 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1665 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1666 x->props.mode = orig->props.mode;
1667 x->props.replay_window = orig->props.replay_window;
1668 x->props.reqid = orig->props.reqid;
1669 x->props.family = orig->props.family;
1670 x->props.saddr = orig->props.saddr;
1671
1672 if (orig->aalg) {
1673 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1674 if (!x->aalg)
1675 goto error;
1676 }
1677 x->props.aalgo = orig->props.aalgo;
1678
1679 if (orig->aead) {
1680 x->aead = xfrm_algo_aead_clone(orig->aead);
1681 x->geniv = orig->geniv;
1682 if (!x->aead)
1683 goto error;
1684 }
1685 if (orig->ealg) {
1686 x->ealg = xfrm_algo_clone(orig->ealg);
1687 if (!x->ealg)
1688 goto error;
1689 }
1690 x->props.ealgo = orig->props.ealgo;
1691
1692 if (orig->calg) {
1693 x->calg = xfrm_algo_clone(orig->calg);
1694 if (!x->calg)
1695 goto error;
1696 }
1697 x->props.calgo = orig->props.calgo;
1698
1699 if (encap || orig->encap) {
1700 if (encap)
1701 x->encap = kmemdup(encap, sizeof(*x->encap),
1702 GFP_KERNEL);
1703 else
1704 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1705 GFP_KERNEL);
1706
1707 if (!x->encap)
1708 goto error;
1709 }
1710
1711 if (orig->security)
1712 if (clone_security(x, orig->security))
1713 goto error;
1714
1715 if (orig->coaddr) {
1716 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1717 GFP_KERNEL);
1718 if (!x->coaddr)
1719 goto error;
1720 }
1721
1722 if (orig->replay_esn) {
1723 if (xfrm_replay_clone(x, orig))
1724 goto error;
1725 }
1726
1727 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1728 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1729
1730 x->props.flags = orig->props.flags;
1731 x->props.extra_flags = orig->props.extra_flags;
1732
1733 x->if_id = orig->if_id;
1734 x->tfcpad = orig->tfcpad;
1735 x->replay_maxdiff = orig->replay_maxdiff;
1736 x->replay_maxage = orig->replay_maxage;
1737 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1738 x->km.state = orig->km.state;
1739 x->km.seq = orig->km.seq;
1740 x->replay = orig->replay;
1741 x->preplay = orig->preplay;
1742 x->mapping_maxage = orig->mapping_maxage;
1743 x->lastused = orig->lastused;
1744 x->new_mapping = 0;
1745 x->new_mapping_sport = 0;
1746
1747 return x;
1748
1749 error:
1750 xfrm_state_put(x);
1751 out:
1752 return NULL;
1753 }
1754
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1755 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1756 u32 if_id)
1757 {
1758 unsigned int h;
1759 struct xfrm_state *x = NULL;
1760
1761 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1762
1763 if (m->reqid) {
1764 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1765 m->reqid, m->old_family);
1766 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1767 if (x->props.mode != m->mode ||
1768 x->id.proto != m->proto)
1769 continue;
1770 if (m->reqid && x->props.reqid != m->reqid)
1771 continue;
1772 if (if_id != 0 && x->if_id != if_id)
1773 continue;
1774 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1775 m->old_family) ||
1776 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1777 m->old_family))
1778 continue;
1779 xfrm_state_hold(x);
1780 break;
1781 }
1782 } else {
1783 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1784 m->old_family);
1785 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1786 if (x->props.mode != m->mode ||
1787 x->id.proto != m->proto)
1788 continue;
1789 if (if_id != 0 && x->if_id != if_id)
1790 continue;
1791 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1792 m->old_family) ||
1793 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1794 m->old_family))
1795 continue;
1796 xfrm_state_hold(x);
1797 break;
1798 }
1799 }
1800
1801 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1802
1803 return x;
1804 }
1805 EXPORT_SYMBOL(xfrm_migrate_state_find);
1806
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1807 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1808 struct xfrm_migrate *m,
1809 struct xfrm_encap_tmpl *encap)
1810 {
1811 struct xfrm_state *xc;
1812
1813 xc = xfrm_state_clone(x, encap);
1814 if (!xc)
1815 return NULL;
1816
1817 xc->props.family = m->new_family;
1818
1819 if (xfrm_init_state(xc) < 0)
1820 goto error;
1821
1822 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1823 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1824
1825 /* add state */
1826 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1827 /* a care is needed when the destination address of the
1828 state is to be updated as it is a part of triplet */
1829 xfrm_state_insert(xc);
1830 } else {
1831 if (xfrm_state_add(xc) < 0)
1832 goto error;
1833 }
1834
1835 return xc;
1836 error:
1837 xfrm_state_put(xc);
1838 return NULL;
1839 }
1840 EXPORT_SYMBOL(xfrm_state_migrate);
1841 #endif
1842
xfrm_state_update(struct xfrm_state * x)1843 int xfrm_state_update(struct xfrm_state *x)
1844 {
1845 struct xfrm_state *x1, *to_put;
1846 int err;
1847 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1848 struct net *net = xs_net(x);
1849
1850 to_put = NULL;
1851
1852 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1853 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1854
1855 err = -ESRCH;
1856 if (!x1)
1857 goto out;
1858
1859 if (xfrm_state_kern(x1)) {
1860 to_put = x1;
1861 err = -EEXIST;
1862 goto out;
1863 }
1864
1865 if (x1->km.state == XFRM_STATE_ACQ) {
1866 __xfrm_state_insert(x);
1867 x = NULL;
1868 }
1869 err = 0;
1870
1871 out:
1872 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1873
1874 if (to_put)
1875 xfrm_state_put(to_put);
1876
1877 if (err)
1878 return err;
1879
1880 if (!x) {
1881 xfrm_state_delete(x1);
1882 xfrm_state_put(x1);
1883 return 0;
1884 }
1885
1886 err = -EINVAL;
1887 spin_lock_bh(&x1->lock);
1888 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1889 if (x->encap && x1->encap &&
1890 x->encap->encap_type == x1->encap->encap_type)
1891 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1892 else if (x->encap || x1->encap)
1893 goto fail;
1894
1895 if (x->coaddr && x1->coaddr) {
1896 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1897 }
1898 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1899 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1900 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1901 x1->km.dying = 0;
1902
1903 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1904 HRTIMER_MODE_REL_SOFT);
1905 if (READ_ONCE(x1->curlft.use_time))
1906 xfrm_state_check_expire(x1);
1907
1908 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1909 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1910
1911 if (x->props.smark.m || x->props.smark.v)
1912 x1->props.smark = x->props.smark;
1913
1914 if (x->if_id)
1915 x1->if_id = x->if_id;
1916
1917 __xfrm_state_bump_genids(x1);
1918 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1919 }
1920
1921 err = 0;
1922 x->km.state = XFRM_STATE_DEAD;
1923 __xfrm_state_put(x);
1924 }
1925
1926 fail:
1927 spin_unlock_bh(&x1->lock);
1928
1929 xfrm_state_put(x1);
1930
1931 return err;
1932 }
1933 EXPORT_SYMBOL(xfrm_state_update);
1934
xfrm_state_check_expire(struct xfrm_state * x)1935 int xfrm_state_check_expire(struct xfrm_state *x)
1936 {
1937 xfrm_dev_state_update_curlft(x);
1938
1939 if (!READ_ONCE(x->curlft.use_time))
1940 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds());
1941
1942 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1943 x->curlft.packets >= x->lft.hard_packet_limit) {
1944 x->km.state = XFRM_STATE_EXPIRED;
1945 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1946 return -EINVAL;
1947 }
1948
1949 if (!x->km.dying &&
1950 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1951 x->curlft.packets >= x->lft.soft_packet_limit)) {
1952 x->km.dying = 1;
1953 km_state_expired(x, 0, 0);
1954 }
1955 return 0;
1956 }
1957 EXPORT_SYMBOL(xfrm_state_check_expire);
1958
1959 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1960 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1961 u8 proto, unsigned short family)
1962 {
1963 struct xfrm_state *x;
1964
1965 rcu_read_lock();
1966 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1967 rcu_read_unlock();
1968 return x;
1969 }
1970 EXPORT_SYMBOL(xfrm_state_lookup);
1971
1972 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)1973 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1974 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1975 u8 proto, unsigned short family)
1976 {
1977 struct xfrm_state *x;
1978
1979 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1980 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1981 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1982 return x;
1983 }
1984 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1985
1986 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)1987 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1988 u32 if_id, u8 proto, const xfrm_address_t *daddr,
1989 const xfrm_address_t *saddr, int create, unsigned short family)
1990 {
1991 struct xfrm_state *x;
1992
1993 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1994 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1995 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1996
1997 return x;
1998 }
1999 EXPORT_SYMBOL(xfrm_find_acq);
2000
2001 #ifdef CONFIG_XFRM_SUB_POLICY
2002 #if IS_ENABLED(CONFIG_IPV6)
2003 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
2004 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2005 __xfrm6_sort(void **dst, void **src, int n,
2006 int (*cmp)(const void *p), int maxclass)
2007 {
2008 int count[XFRM_MAX_DEPTH] = { };
2009 int class[XFRM_MAX_DEPTH];
2010 int i;
2011
2012 for (i = 0; i < n; i++) {
2013 int c = cmp(src[i]);
2014
2015 class[i] = c;
2016 count[c]++;
2017 }
2018
2019 for (i = 2; i < maxclass; i++)
2020 count[i] += count[i - 1];
2021
2022 for (i = 0; i < n; i++) {
2023 dst[count[class[i] - 1]++] = src[i];
2024 src[i] = NULL;
2025 }
2026 }
2027
2028 /* Rule for xfrm_state:
2029 *
2030 * rule 1: select IPsec transport except AH
2031 * rule 2: select MIPv6 RO or inbound trigger
2032 * rule 3: select IPsec transport AH
2033 * rule 4: select IPsec tunnel
2034 * rule 5: others
2035 */
__xfrm6_state_sort_cmp(const void * p)2036 static int __xfrm6_state_sort_cmp(const void *p)
2037 {
2038 const struct xfrm_state *v = p;
2039
2040 switch (v->props.mode) {
2041 case XFRM_MODE_TRANSPORT:
2042 if (v->id.proto != IPPROTO_AH)
2043 return 1;
2044 else
2045 return 3;
2046 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2047 case XFRM_MODE_ROUTEOPTIMIZATION:
2048 case XFRM_MODE_IN_TRIGGER:
2049 return 2;
2050 #endif
2051 case XFRM_MODE_TUNNEL:
2052 case XFRM_MODE_BEET:
2053 return 4;
2054 }
2055 return 5;
2056 }
2057
2058 /* Rule for xfrm_tmpl:
2059 *
2060 * rule 1: select IPsec transport
2061 * rule 2: select MIPv6 RO or inbound trigger
2062 * rule 3: select IPsec tunnel
2063 * rule 4: others
2064 */
__xfrm6_tmpl_sort_cmp(const void * p)2065 static int __xfrm6_tmpl_sort_cmp(const void *p)
2066 {
2067 const struct xfrm_tmpl *v = p;
2068
2069 switch (v->mode) {
2070 case XFRM_MODE_TRANSPORT:
2071 return 1;
2072 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2073 case XFRM_MODE_ROUTEOPTIMIZATION:
2074 case XFRM_MODE_IN_TRIGGER:
2075 return 2;
2076 #endif
2077 case XFRM_MODE_TUNNEL:
2078 case XFRM_MODE_BEET:
2079 return 3;
2080 }
2081 return 4;
2082 }
2083 #else
__xfrm6_state_sort_cmp(const void * p)2084 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)2085 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
2086
2087 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2088 __xfrm6_sort(void **dst, void **src, int n,
2089 int (*cmp)(const void *p), int maxclass)
2090 {
2091 int i;
2092
2093 for (i = 0; i < n; i++)
2094 dst[i] = src[i];
2095 }
2096 #endif /* CONFIG_IPV6 */
2097
2098 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)2099 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
2100 unsigned short family)
2101 {
2102 int i;
2103
2104 if (family == AF_INET6)
2105 __xfrm6_sort((void **)dst, (void **)src, n,
2106 __xfrm6_tmpl_sort_cmp, 5);
2107 else
2108 for (i = 0; i < n; i++)
2109 dst[i] = src[i];
2110 }
2111
2112 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)2113 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
2114 unsigned short family)
2115 {
2116 int i;
2117
2118 if (family == AF_INET6)
2119 __xfrm6_sort((void **)dst, (void **)src, n,
2120 __xfrm6_state_sort_cmp, 6);
2121 else
2122 for (i = 0; i < n; i++)
2123 dst[i] = src[i];
2124 }
2125 #endif
2126
2127 /* Silly enough, but I'm lazy to build resolution list */
2128
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2129 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2130 {
2131 unsigned int h = xfrm_seq_hash(net, seq);
2132 struct xfrm_state *x;
2133
2134 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
2135 if (x->km.seq == seq &&
2136 (mark & x->mark.m) == x->mark.v &&
2137 x->km.state == XFRM_STATE_ACQ) {
2138 xfrm_state_hold(x);
2139 return x;
2140 }
2141 }
2142
2143 return NULL;
2144 }
2145
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2146 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2147 {
2148 struct xfrm_state *x;
2149
2150 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2151 x = __xfrm_find_acq_byseq(net, mark, seq);
2152 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2153 return x;
2154 }
2155 EXPORT_SYMBOL(xfrm_find_acq_byseq);
2156
xfrm_get_acqseq(void)2157 u32 xfrm_get_acqseq(void)
2158 {
2159 u32 res;
2160 static atomic_t acqseq;
2161
2162 do {
2163 res = atomic_inc_return(&acqseq);
2164 } while (!res);
2165
2166 return res;
2167 }
2168 EXPORT_SYMBOL(xfrm_get_acqseq);
2169
verify_spi_info(u8 proto,u32 min,u32 max,struct netlink_ext_ack * extack)2170 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
2171 {
2172 switch (proto) {
2173 case IPPROTO_AH:
2174 case IPPROTO_ESP:
2175 break;
2176
2177 case IPPROTO_COMP:
2178 /* IPCOMP spi is 16-bits. */
2179 if (max >= 0x10000) {
2180 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
2181 return -EINVAL;
2182 }
2183 break;
2184
2185 default:
2186 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
2187 return -EINVAL;
2188 }
2189
2190 if (min > max) {
2191 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
2192 return -EINVAL;
2193 }
2194
2195 return 0;
2196 }
2197 EXPORT_SYMBOL(verify_spi_info);
2198
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high,struct netlink_ext_ack * extack)2199 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
2200 struct netlink_ext_ack *extack)
2201 {
2202 struct net *net = xs_net(x);
2203 unsigned int h;
2204 struct xfrm_state *x0;
2205 int err = -ENOENT;
2206 __be32 minspi = htonl(low);
2207 __be32 maxspi = htonl(high);
2208 __be32 newspi = 0;
2209 u32 mark = x->mark.v & x->mark.m;
2210
2211 spin_lock_bh(&x->lock);
2212 if (x->km.state == XFRM_STATE_DEAD) {
2213 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
2214 goto unlock;
2215 }
2216
2217 err = 0;
2218 if (x->id.spi)
2219 goto unlock;
2220
2221 err = -ENOENT;
2222
2223 if (minspi == maxspi) {
2224 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2225 if (x0) {
2226 NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
2227 xfrm_state_put(x0);
2228 goto unlock;
2229 }
2230 newspi = minspi;
2231 } else {
2232 u32 spi = 0;
2233 for (h = 0; h < high-low+1; h++) {
2234 spi = get_random_u32_inclusive(low, high);
2235 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2236 if (x0 == NULL) {
2237 newspi = htonl(spi);
2238 break;
2239 }
2240 xfrm_state_put(x0);
2241 }
2242 }
2243 if (newspi) {
2244 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2245 x->id.spi = newspi;
2246 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2247 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
2248 x->xso.type);
2249 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2250
2251 err = 0;
2252 } else {
2253 NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
2254 }
2255
2256 unlock:
2257 spin_unlock_bh(&x->lock);
2258
2259 return err;
2260 }
2261 EXPORT_SYMBOL(xfrm_alloc_spi);
2262
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2263 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2264 struct xfrm_address_filter *filter)
2265 {
2266 if (filter) {
2267 if ((filter->family == AF_INET ||
2268 filter->family == AF_INET6) &&
2269 x->props.family != filter->family)
2270 return false;
2271
2272 return addr_match(&x->props.saddr, &filter->saddr,
2273 filter->splen) &&
2274 addr_match(&x->id.daddr, &filter->daddr,
2275 filter->dplen);
2276 }
2277 return true;
2278 }
2279
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2280 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2281 int (*func)(struct xfrm_state *, int, void*),
2282 void *data)
2283 {
2284 struct xfrm_state *state;
2285 struct xfrm_state_walk *x;
2286 int err = 0;
2287
2288 if (walk->seq != 0 && list_empty(&walk->all))
2289 return 0;
2290
2291 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2292 if (list_empty(&walk->all))
2293 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2294 else
2295 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2296 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2297 if (x->state == XFRM_STATE_DEAD)
2298 continue;
2299 state = container_of(x, struct xfrm_state, km);
2300 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2301 continue;
2302 if (!__xfrm_state_filter_match(state, walk->filter))
2303 continue;
2304 err = func(state, walk->seq, data);
2305 if (err) {
2306 list_move_tail(&walk->all, &x->all);
2307 goto out;
2308 }
2309 walk->seq++;
2310 }
2311 if (walk->seq == 0) {
2312 err = -ENOENT;
2313 goto out;
2314 }
2315 list_del_init(&walk->all);
2316 out:
2317 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2318 return err;
2319 }
2320 EXPORT_SYMBOL(xfrm_state_walk);
2321
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2322 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2323 struct xfrm_address_filter *filter)
2324 {
2325 INIT_LIST_HEAD(&walk->all);
2326 walk->proto = proto;
2327 walk->state = XFRM_STATE_DEAD;
2328 walk->seq = 0;
2329 walk->filter = filter;
2330 }
2331 EXPORT_SYMBOL(xfrm_state_walk_init);
2332
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2333 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2334 {
2335 kfree(walk->filter);
2336
2337 if (list_empty(&walk->all))
2338 return;
2339
2340 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2341 list_del(&walk->all);
2342 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2343 }
2344 EXPORT_SYMBOL(xfrm_state_walk_done);
2345
xfrm_replay_timer_handler(struct timer_list * t)2346 static void xfrm_replay_timer_handler(struct timer_list *t)
2347 {
2348 struct xfrm_state *x = from_timer(x, t, rtimer);
2349
2350 spin_lock(&x->lock);
2351
2352 if (x->km.state == XFRM_STATE_VALID) {
2353 if (xfrm_aevent_is_on(xs_net(x)))
2354 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2355 else
2356 x->xflags |= XFRM_TIME_DEFER;
2357 }
2358
2359 spin_unlock(&x->lock);
2360 }
2361
2362 static LIST_HEAD(xfrm_km_list);
2363
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2364 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2365 {
2366 struct xfrm_mgr *km;
2367
2368 rcu_read_lock();
2369 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2370 if (km->notify_policy)
2371 km->notify_policy(xp, dir, c);
2372 rcu_read_unlock();
2373 }
2374
km_state_notify(struct xfrm_state * x,const struct km_event * c)2375 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2376 {
2377 struct xfrm_mgr *km;
2378 rcu_read_lock();
2379 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2380 if (km->notify)
2381 km->notify(x, c);
2382 rcu_read_unlock();
2383 }
2384
2385 EXPORT_SYMBOL(km_policy_notify);
2386 EXPORT_SYMBOL(km_state_notify);
2387
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2388 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2389 {
2390 struct km_event c;
2391
2392 c.data.hard = hard;
2393 c.portid = portid;
2394 c.event = XFRM_MSG_EXPIRE;
2395 km_state_notify(x, &c);
2396 }
2397
2398 EXPORT_SYMBOL(km_state_expired);
2399 /*
2400 * We send to all registered managers regardless of failure
2401 * We are happy with one success
2402 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2403 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2404 {
2405 int err = -EINVAL, acqret;
2406 struct xfrm_mgr *km;
2407
2408 rcu_read_lock();
2409 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2410 acqret = km->acquire(x, t, pol);
2411 if (!acqret)
2412 err = acqret;
2413 }
2414 rcu_read_unlock();
2415 return err;
2416 }
2417 EXPORT_SYMBOL(km_query);
2418
__km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2419 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2420 {
2421 int err = -EINVAL;
2422 struct xfrm_mgr *km;
2423
2424 rcu_read_lock();
2425 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2426 if (km->new_mapping)
2427 err = km->new_mapping(x, ipaddr, sport);
2428 if (!err)
2429 break;
2430 }
2431 rcu_read_unlock();
2432 return err;
2433 }
2434
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2435 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2436 {
2437 int ret = 0;
2438
2439 if (x->mapping_maxage) {
2440 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2441 x->new_mapping_sport != sport) {
2442 x->new_mapping_sport = sport;
2443 x->new_mapping = jiffies / HZ;
2444 ret = __km_new_mapping(x, ipaddr, sport);
2445 }
2446 } else {
2447 ret = __km_new_mapping(x, ipaddr, sport);
2448 }
2449
2450 return ret;
2451 }
2452 EXPORT_SYMBOL(km_new_mapping);
2453
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2454 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2455 {
2456 struct km_event c;
2457
2458 c.data.hard = hard;
2459 c.portid = portid;
2460 c.event = XFRM_MSG_POLEXPIRE;
2461 km_policy_notify(pol, dir, &c);
2462 }
2463 EXPORT_SYMBOL(km_policy_expired);
2464
2465 #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)2466 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2467 const struct xfrm_migrate *m, int num_migrate,
2468 const struct xfrm_kmaddress *k,
2469 const struct xfrm_encap_tmpl *encap)
2470 {
2471 int err = -EINVAL;
2472 int ret;
2473 struct xfrm_mgr *km;
2474
2475 rcu_read_lock();
2476 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2477 if (km->migrate) {
2478 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2479 encap);
2480 if (!ret)
2481 err = ret;
2482 }
2483 }
2484 rcu_read_unlock();
2485 return err;
2486 }
2487 EXPORT_SYMBOL(km_migrate);
2488 #endif
2489
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2490 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2491 {
2492 int err = -EINVAL;
2493 int ret;
2494 struct xfrm_mgr *km;
2495
2496 rcu_read_lock();
2497 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2498 if (km->report) {
2499 ret = km->report(net, proto, sel, addr);
2500 if (!ret)
2501 err = ret;
2502 }
2503 }
2504 rcu_read_unlock();
2505 return err;
2506 }
2507 EXPORT_SYMBOL(km_report);
2508
km_is_alive(const struct km_event * c)2509 static bool km_is_alive(const struct km_event *c)
2510 {
2511 struct xfrm_mgr *km;
2512 bool is_alive = false;
2513
2514 rcu_read_lock();
2515 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2516 if (km->is_alive && km->is_alive(c)) {
2517 is_alive = true;
2518 break;
2519 }
2520 }
2521 rcu_read_unlock();
2522
2523 return is_alive;
2524 }
2525
2526 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2527 static DEFINE_SPINLOCK(xfrm_translator_lock);
2528 static struct xfrm_translator __rcu *xfrm_translator;
2529
xfrm_get_translator(void)2530 struct xfrm_translator *xfrm_get_translator(void)
2531 {
2532 struct xfrm_translator *xtr;
2533
2534 rcu_read_lock();
2535 xtr = rcu_dereference(xfrm_translator);
2536 if (unlikely(!xtr))
2537 goto out;
2538 if (!try_module_get(xtr->owner))
2539 xtr = NULL;
2540 out:
2541 rcu_read_unlock();
2542 return xtr;
2543 }
2544 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2545
xfrm_put_translator(struct xfrm_translator * xtr)2546 void xfrm_put_translator(struct xfrm_translator *xtr)
2547 {
2548 module_put(xtr->owner);
2549 }
2550 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2551
xfrm_register_translator(struct xfrm_translator * xtr)2552 int xfrm_register_translator(struct xfrm_translator *xtr)
2553 {
2554 int err = 0;
2555
2556 spin_lock_bh(&xfrm_translator_lock);
2557 if (unlikely(xfrm_translator != NULL))
2558 err = -EEXIST;
2559 else
2560 rcu_assign_pointer(xfrm_translator, xtr);
2561 spin_unlock_bh(&xfrm_translator_lock);
2562
2563 return err;
2564 }
2565 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2566
xfrm_unregister_translator(struct xfrm_translator * xtr)2567 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2568 {
2569 int err = 0;
2570
2571 spin_lock_bh(&xfrm_translator_lock);
2572 if (likely(xfrm_translator != NULL)) {
2573 if (rcu_access_pointer(xfrm_translator) != xtr)
2574 err = -EINVAL;
2575 else
2576 RCU_INIT_POINTER(xfrm_translator, NULL);
2577 }
2578 spin_unlock_bh(&xfrm_translator_lock);
2579 synchronize_rcu();
2580
2581 return err;
2582 }
2583 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2584 #endif
2585
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2586 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2587 {
2588 int err;
2589 u8 *data;
2590 struct xfrm_mgr *km;
2591 struct xfrm_policy *pol = NULL;
2592
2593 if (sockptr_is_null(optval) && !optlen) {
2594 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2595 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2596 __sk_dst_reset(sk);
2597 return 0;
2598 }
2599
2600 if (optlen <= 0 || optlen > PAGE_SIZE)
2601 return -EMSGSIZE;
2602
2603 data = memdup_sockptr(optval, optlen);
2604 if (IS_ERR(data))
2605 return PTR_ERR(data);
2606
2607 /* Use the 64-bit / untranslated format on Android, even for compat */
2608 if (!IS_ENABLED(CONFIG_GKI_NET_XFRM_HACKS) || IS_ENABLED(CONFIG_XFRM_USER_COMPAT)) {
2609 if (in_compat_syscall()) {
2610 struct xfrm_translator *xtr = xfrm_get_translator();
2611
2612 if (!xtr) {
2613 kfree(data);
2614 return -EOPNOTSUPP;
2615 }
2616
2617 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2618 xfrm_put_translator(xtr);
2619 if (err) {
2620 kfree(data);
2621 return err;
2622 }
2623 }
2624 }
2625
2626 err = -EINVAL;
2627 rcu_read_lock();
2628 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2629 pol = km->compile_policy(sk, optname, data,
2630 optlen, &err);
2631 if (err >= 0)
2632 break;
2633 }
2634 rcu_read_unlock();
2635
2636 if (err >= 0) {
2637 xfrm_sk_policy_insert(sk, err, pol);
2638 xfrm_pol_put(pol);
2639 __sk_dst_reset(sk);
2640 err = 0;
2641 }
2642
2643 kfree(data);
2644 return err;
2645 }
2646 EXPORT_SYMBOL(xfrm_user_policy);
2647
2648 static DEFINE_SPINLOCK(xfrm_km_lock);
2649
xfrm_register_km(struct xfrm_mgr * km)2650 void xfrm_register_km(struct xfrm_mgr *km)
2651 {
2652 spin_lock_bh(&xfrm_km_lock);
2653 list_add_tail_rcu(&km->list, &xfrm_km_list);
2654 spin_unlock_bh(&xfrm_km_lock);
2655 }
2656 EXPORT_SYMBOL(xfrm_register_km);
2657
xfrm_unregister_km(struct xfrm_mgr * km)2658 void xfrm_unregister_km(struct xfrm_mgr *km)
2659 {
2660 spin_lock_bh(&xfrm_km_lock);
2661 list_del_rcu(&km->list);
2662 spin_unlock_bh(&xfrm_km_lock);
2663 synchronize_rcu();
2664 }
2665 EXPORT_SYMBOL(xfrm_unregister_km);
2666
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2667 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2668 {
2669 int err = 0;
2670
2671 if (WARN_ON(afinfo->family >= NPROTO))
2672 return -EAFNOSUPPORT;
2673
2674 spin_lock_bh(&xfrm_state_afinfo_lock);
2675 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2676 err = -EEXIST;
2677 else
2678 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2679 spin_unlock_bh(&xfrm_state_afinfo_lock);
2680 return err;
2681 }
2682 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2683
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2684 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2685 {
2686 int err = 0, family = afinfo->family;
2687
2688 if (WARN_ON(family >= NPROTO))
2689 return -EAFNOSUPPORT;
2690
2691 spin_lock_bh(&xfrm_state_afinfo_lock);
2692 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2693 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2694 err = -EINVAL;
2695 else
2696 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2697 }
2698 spin_unlock_bh(&xfrm_state_afinfo_lock);
2699 synchronize_rcu();
2700 return err;
2701 }
2702 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2703
xfrm_state_afinfo_get_rcu(unsigned int family)2704 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2705 {
2706 if (unlikely(family >= NPROTO))
2707 return NULL;
2708
2709 return rcu_dereference(xfrm_state_afinfo[family]);
2710 }
2711 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2712
xfrm_state_get_afinfo(unsigned int family)2713 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2714 {
2715 struct xfrm_state_afinfo *afinfo;
2716 if (unlikely(family >= NPROTO))
2717 return NULL;
2718 rcu_read_lock();
2719 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2720 if (unlikely(!afinfo))
2721 rcu_read_unlock();
2722 return afinfo;
2723 }
2724
xfrm_flush_gc(void)2725 void xfrm_flush_gc(void)
2726 {
2727 flush_work(&xfrm_state_gc_work);
2728 }
2729 EXPORT_SYMBOL(xfrm_flush_gc);
2730
2731 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2732 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2733 {
2734 if (x->tunnel) {
2735 struct xfrm_state *t = x->tunnel;
2736
2737 if (atomic_read(&t->tunnel_users) == 2)
2738 xfrm_state_delete(t);
2739 atomic_dec(&t->tunnel_users);
2740 xfrm_state_put_sync(t);
2741 x->tunnel = NULL;
2742 }
2743 }
2744 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2745
xfrm_state_mtu(struct xfrm_state * x,int mtu)2746 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2747 {
2748 const struct xfrm_type *type = READ_ONCE(x->type);
2749 struct crypto_aead *aead;
2750 u32 blksize, net_adj = 0;
2751
2752 if (x->km.state != XFRM_STATE_VALID ||
2753 !type || type->proto != IPPROTO_ESP)
2754 return mtu - x->props.header_len;
2755
2756 aead = x->data;
2757 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2758
2759 switch (x->props.mode) {
2760 case XFRM_MODE_TRANSPORT:
2761 case XFRM_MODE_BEET:
2762 if (x->props.family == AF_INET)
2763 net_adj = sizeof(struct iphdr);
2764 else if (x->props.family == AF_INET6)
2765 net_adj = sizeof(struct ipv6hdr);
2766 break;
2767 case XFRM_MODE_TUNNEL:
2768 break;
2769 default:
2770 WARN_ON_ONCE(1);
2771 break;
2772 }
2773
2774 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2775 net_adj) & ~(blksize - 1)) + net_adj - 2;
2776 }
2777 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2778
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload,struct netlink_ext_ack * extack)2779 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2780 struct netlink_ext_ack *extack)
2781 {
2782 const struct xfrm_mode *inner_mode;
2783 const struct xfrm_mode *outer_mode;
2784 int family = x->props.family;
2785 int err;
2786
2787 if (family == AF_INET &&
2788 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2789 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2790
2791 err = -EPROTONOSUPPORT;
2792
2793 if (x->sel.family != AF_UNSPEC) {
2794 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2795 if (inner_mode == NULL) {
2796 NL_SET_ERR_MSG(extack, "Requested mode not found");
2797 goto error;
2798 }
2799
2800 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2801 family != x->sel.family) {
2802 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
2803 goto error;
2804 }
2805
2806 x->inner_mode = *inner_mode;
2807 } else {
2808 const struct xfrm_mode *inner_mode_iaf;
2809 int iafamily = AF_INET;
2810
2811 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2812 if (inner_mode == NULL) {
2813 NL_SET_ERR_MSG(extack, "Requested mode not found");
2814 goto error;
2815 }
2816
2817 x->inner_mode = *inner_mode;
2818
2819 if (x->props.family == AF_INET)
2820 iafamily = AF_INET6;
2821
2822 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2823 if (inner_mode_iaf) {
2824 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2825 x->inner_mode_iaf = *inner_mode_iaf;
2826 }
2827 }
2828
2829 x->type = xfrm_get_type(x->id.proto, family);
2830 if (x->type == NULL) {
2831 NL_SET_ERR_MSG(extack, "Requested type not found");
2832 goto error;
2833 }
2834
2835 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2836
2837 err = x->type->init_state(x, extack);
2838 if (err)
2839 goto error;
2840
2841 outer_mode = xfrm_get_mode(x->props.mode, family);
2842 if (!outer_mode) {
2843 NL_SET_ERR_MSG(extack, "Requested mode not found");
2844 err = -EPROTONOSUPPORT;
2845 goto error;
2846 }
2847
2848 x->outer_mode = *outer_mode;
2849 if (init_replay) {
2850 err = xfrm_init_replay(x, extack);
2851 if (err)
2852 goto error;
2853 }
2854
2855 error:
2856 return err;
2857 }
2858
2859 EXPORT_SYMBOL(__xfrm_init_state);
2860
xfrm_init_state(struct xfrm_state * x)2861 int xfrm_init_state(struct xfrm_state *x)
2862 {
2863 int err;
2864
2865 err = __xfrm_init_state(x, true, false, NULL);
2866 if (!err)
2867 x->km.state = XFRM_STATE_VALID;
2868
2869 return err;
2870 }
2871
2872 EXPORT_SYMBOL(xfrm_init_state);
2873
xfrm_state_init(struct net * net)2874 int __net_init xfrm_state_init(struct net *net)
2875 {
2876 unsigned int sz;
2877
2878 if (net_eq(net, &init_net))
2879 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2880 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2881
2882 INIT_LIST_HEAD(&net->xfrm.state_all);
2883
2884 sz = sizeof(struct hlist_head) * 8;
2885
2886 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2887 if (!net->xfrm.state_bydst)
2888 goto out_bydst;
2889 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2890 if (!net->xfrm.state_bysrc)
2891 goto out_bysrc;
2892 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2893 if (!net->xfrm.state_byspi)
2894 goto out_byspi;
2895 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2896 if (!net->xfrm.state_byseq)
2897 goto out_byseq;
2898 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2899
2900 net->xfrm.state_num = 0;
2901 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2902 spin_lock_init(&net->xfrm.xfrm_state_lock);
2903 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2904 &net->xfrm.xfrm_state_lock);
2905 return 0;
2906
2907 out_byseq:
2908 xfrm_hash_free(net->xfrm.state_byspi, sz);
2909 out_byspi:
2910 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2911 out_bysrc:
2912 xfrm_hash_free(net->xfrm.state_bydst, sz);
2913 out_bydst:
2914 return -ENOMEM;
2915 }
2916
xfrm_state_fini(struct net * net)2917 void xfrm_state_fini(struct net *net)
2918 {
2919 unsigned int sz;
2920
2921 flush_work(&net->xfrm.state_hash_work);
2922 flush_work(&xfrm_state_gc_work);
2923 xfrm_state_flush(net, 0, false, true);
2924
2925 WARN_ON(!list_empty(&net->xfrm.state_all));
2926
2927 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2928 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2929 xfrm_hash_free(net->xfrm.state_byseq, sz);
2930 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2931 xfrm_hash_free(net->xfrm.state_byspi, sz);
2932 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2933 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2934 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2935 xfrm_hash_free(net->xfrm.state_bydst, sz);
2936 }
2937
2938 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2939 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2940 struct audit_buffer *audit_buf)
2941 {
2942 struct xfrm_sec_ctx *ctx = x->security;
2943 u32 spi = ntohl(x->id.spi);
2944
2945 if (ctx)
2946 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2947 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2948
2949 switch (x->props.family) {
2950 case AF_INET:
2951 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2952 &x->props.saddr.a4, &x->id.daddr.a4);
2953 break;
2954 case AF_INET6:
2955 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2956 x->props.saddr.a6, x->id.daddr.a6);
2957 break;
2958 }
2959
2960 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2961 }
2962
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2963 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2964 struct audit_buffer *audit_buf)
2965 {
2966 const struct iphdr *iph4;
2967 const struct ipv6hdr *iph6;
2968
2969 switch (family) {
2970 case AF_INET:
2971 iph4 = ip_hdr(skb);
2972 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2973 &iph4->saddr, &iph4->daddr);
2974 break;
2975 case AF_INET6:
2976 iph6 = ipv6_hdr(skb);
2977 audit_log_format(audit_buf,
2978 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2979 &iph6->saddr, &iph6->daddr,
2980 iph6->flow_lbl[0] & 0x0f,
2981 iph6->flow_lbl[1],
2982 iph6->flow_lbl[2]);
2983 break;
2984 }
2985 }
2986
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)2987 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2988 {
2989 struct audit_buffer *audit_buf;
2990
2991 audit_buf = xfrm_audit_start("SAD-add");
2992 if (audit_buf == NULL)
2993 return;
2994 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2995 xfrm_audit_helper_sainfo(x, audit_buf);
2996 audit_log_format(audit_buf, " res=%u", result);
2997 audit_log_end(audit_buf);
2998 }
2999 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
3000
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)3001 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
3002 {
3003 struct audit_buffer *audit_buf;
3004
3005 audit_buf = xfrm_audit_start("SAD-delete");
3006 if (audit_buf == NULL)
3007 return;
3008 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3009 xfrm_audit_helper_sainfo(x, audit_buf);
3010 audit_log_format(audit_buf, " res=%u", result);
3011 audit_log_end(audit_buf);
3012 }
3013 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
3014
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)3015 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
3016 struct sk_buff *skb)
3017 {
3018 struct audit_buffer *audit_buf;
3019 u32 spi;
3020
3021 audit_buf = xfrm_audit_start("SA-replay-overflow");
3022 if (audit_buf == NULL)
3023 return;
3024 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3025 /* don't record the sequence number because it's inherent in this kind
3026 * of audit message */
3027 spi = ntohl(x->id.spi);
3028 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
3029 audit_log_end(audit_buf);
3030 }
3031 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
3032
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)3033 void xfrm_audit_state_replay(struct xfrm_state *x,
3034 struct sk_buff *skb, __be32 net_seq)
3035 {
3036 struct audit_buffer *audit_buf;
3037 u32 spi;
3038
3039 audit_buf = xfrm_audit_start("SA-replayed-pkt");
3040 if (audit_buf == NULL)
3041 return;
3042 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3043 spi = ntohl(x->id.spi);
3044 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3045 spi, spi, ntohl(net_seq));
3046 audit_log_end(audit_buf);
3047 }
3048 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
3049
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)3050 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
3051 {
3052 struct audit_buffer *audit_buf;
3053
3054 audit_buf = xfrm_audit_start("SA-notfound");
3055 if (audit_buf == NULL)
3056 return;
3057 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3058 audit_log_end(audit_buf);
3059 }
3060 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
3061
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)3062 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
3063 __be32 net_spi, __be32 net_seq)
3064 {
3065 struct audit_buffer *audit_buf;
3066 u32 spi;
3067
3068 audit_buf = xfrm_audit_start("SA-notfound");
3069 if (audit_buf == NULL)
3070 return;
3071 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3072 spi = ntohl(net_spi);
3073 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3074 spi, spi, ntohl(net_seq));
3075 audit_log_end(audit_buf);
3076 }
3077 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
3078
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)3079 void xfrm_audit_state_icvfail(struct xfrm_state *x,
3080 struct sk_buff *skb, u8 proto)
3081 {
3082 struct audit_buffer *audit_buf;
3083 __be32 net_spi;
3084 __be32 net_seq;
3085
3086 audit_buf = xfrm_audit_start("SA-icv-failure");
3087 if (audit_buf == NULL)
3088 return;
3089 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3090 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
3091 u32 spi = ntohl(net_spi);
3092 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3093 spi, spi, ntohl(net_seq));
3094 }
3095 audit_log_end(audit_buf);
3096 }
3097 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
3098 #endif /* CONFIG_AUDITSYSCALL */
3099