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_stats(x);
574
575 if (x->km.state == XFRM_STATE_DEAD)
576 goto out;
577 if (x->km.state == XFRM_STATE_EXPIRED)
578 goto expired;
579 if (x->lft.hard_add_expires_seconds) {
580 time64_t tmo = x->lft.hard_add_expires_seconds +
581 x->curlft.add_time - now;
582 if (tmo <= 0) {
583 if (x->xflags & XFRM_SOFT_EXPIRE) {
584 /* enter hard expire without soft expire first?!
585 * setting a new date could trigger this.
586 * workaround: fix x->curflt.add_time by below:
587 */
588 x->curlft.add_time = now - x->saved_tmo - 1;
589 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
590 } else
591 goto expired;
592 }
593 if (tmo < next)
594 next = tmo;
595 }
596 if (x->lft.hard_use_expires_seconds) {
597 time64_t tmo = x->lft.hard_use_expires_seconds +
598 (READ_ONCE(x->curlft.use_time) ? : now) - now;
599 if (tmo <= 0)
600 goto expired;
601 if (tmo < next)
602 next = tmo;
603 }
604 if (x->km.dying)
605 goto resched;
606 if (x->lft.soft_add_expires_seconds) {
607 time64_t tmo = x->lft.soft_add_expires_seconds +
608 x->curlft.add_time - now;
609 if (tmo <= 0) {
610 warn = 1;
611 x->xflags &= ~XFRM_SOFT_EXPIRE;
612 } else if (tmo < next) {
613 next = tmo;
614 x->xflags |= XFRM_SOFT_EXPIRE;
615 x->saved_tmo = tmo;
616 }
617 }
618 if (x->lft.soft_use_expires_seconds) {
619 time64_t tmo = x->lft.soft_use_expires_seconds +
620 (READ_ONCE(x->curlft.use_time) ? : now) - now;
621 if (tmo <= 0)
622 warn = 1;
623 else if (tmo < next)
624 next = tmo;
625 }
626
627 x->km.dying = warn;
628 if (warn)
629 km_state_expired(x, 0, 0);
630 resched:
631 if (next != TIME64_MAX) {
632 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
633 ret = HRTIMER_RESTART;
634 }
635
636 goto out;
637
638 expired:
639 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
640 x->km.state = XFRM_STATE_EXPIRED;
641
642 err = __xfrm_state_delete(x);
643 if (!err)
644 km_state_expired(x, 1, 0);
645
646 xfrm_audit_state_delete(x, err ? 0 : 1, true);
647
648 out:
649 spin_unlock(&x->lock);
650 return ret;
651 }
652
653 static void xfrm_replay_timer_handler(struct timer_list *t);
654
xfrm_state_alloc(struct net * net)655 struct xfrm_state *xfrm_state_alloc(struct net *net)
656 {
657 struct xfrm_state *x;
658
659 x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
660
661 if (x) {
662 write_pnet(&x->xs_net, net);
663 refcount_set(&x->refcnt, 1);
664 atomic_set(&x->tunnel_users, 0);
665 INIT_LIST_HEAD(&x->km.all);
666 INIT_HLIST_NODE(&x->bydst);
667 INIT_HLIST_NODE(&x->bysrc);
668 INIT_HLIST_NODE(&x->byspi);
669 INIT_HLIST_NODE(&x->byseq);
670 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
671 x->mtimer.function = xfrm_timer_handler;
672 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
673 x->curlft.add_time = ktime_get_real_seconds();
674 x->lft.soft_byte_limit = XFRM_INF;
675 x->lft.soft_packet_limit = XFRM_INF;
676 x->lft.hard_byte_limit = XFRM_INF;
677 x->lft.hard_packet_limit = XFRM_INF;
678 x->replay_maxage = 0;
679 x->replay_maxdiff = 0;
680 spin_lock_init(&x->lock);
681 }
682 return x;
683 }
684 EXPORT_SYMBOL(xfrm_state_alloc);
685
__xfrm_state_destroy(struct xfrm_state * x,bool sync)686 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
687 {
688 WARN_ON(x->km.state != XFRM_STATE_DEAD);
689
690 if (sync) {
691 synchronize_rcu();
692 ___xfrm_state_destroy(x);
693 } else {
694 spin_lock_bh(&xfrm_state_gc_lock);
695 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
696 spin_unlock_bh(&xfrm_state_gc_lock);
697 schedule_work(&xfrm_state_gc_work);
698 }
699 }
700 EXPORT_SYMBOL(__xfrm_state_destroy);
701
__xfrm_state_delete(struct xfrm_state * x)702 int __xfrm_state_delete(struct xfrm_state *x)
703 {
704 struct net *net = xs_net(x);
705 int err = -ESRCH;
706
707 if (x->km.state != XFRM_STATE_DEAD) {
708 x->km.state = XFRM_STATE_DEAD;
709 spin_lock(&net->xfrm.xfrm_state_lock);
710 list_del(&x->km.all);
711 hlist_del_rcu(&x->bydst);
712 hlist_del_rcu(&x->bysrc);
713 if (x->km.seq)
714 hlist_del_rcu(&x->byseq);
715 if (x->id.spi)
716 hlist_del_rcu(&x->byspi);
717 net->xfrm.state_num--;
718 spin_unlock(&net->xfrm.xfrm_state_lock);
719
720 if (x->encap_sk)
721 sock_put(rcu_dereference_raw(x->encap_sk));
722
723 xfrm_dev_state_delete(x);
724
725 /* All xfrm_state objects are created by xfrm_state_alloc.
726 * The xfrm_state_alloc call gives a reference, and that
727 * is what we are dropping here.
728 */
729 xfrm_state_put(x);
730 err = 0;
731 }
732
733 return err;
734 }
735 EXPORT_SYMBOL(__xfrm_state_delete);
736
xfrm_state_delete(struct xfrm_state * x)737 int xfrm_state_delete(struct xfrm_state *x)
738 {
739 int err;
740
741 spin_lock_bh(&x->lock);
742 err = __xfrm_state_delete(x);
743 spin_unlock_bh(&x->lock);
744
745 return err;
746 }
747 EXPORT_SYMBOL(xfrm_state_delete);
748
749 #ifdef CONFIG_SECURITY_NETWORK_XFRM
750 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)751 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
752 {
753 int i, err = 0;
754
755 for (i = 0; i <= net->xfrm.state_hmask; i++) {
756 struct xfrm_state *x;
757
758 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
759 if (xfrm_id_proto_match(x->id.proto, proto) &&
760 (err = security_xfrm_state_delete(x)) != 0) {
761 xfrm_audit_state_delete(x, 0, task_valid);
762 return err;
763 }
764 }
765 }
766
767 return err;
768 }
769
770 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)771 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
772 {
773 int i, err = 0;
774
775 for (i = 0; i <= net->xfrm.state_hmask; i++) {
776 struct xfrm_state *x;
777 struct xfrm_dev_offload *xso;
778
779 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
780 xso = &x->xso;
781
782 if (xso->dev == dev &&
783 (err = security_xfrm_state_delete(x)) != 0) {
784 xfrm_audit_state_delete(x, 0, task_valid);
785 return err;
786 }
787 }
788 }
789
790 return err;
791 }
792 #else
793 static inline int
xfrm_state_flush_secctx_check(struct net * net,u8 proto,bool task_valid)794 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
795 {
796 return 0;
797 }
798
799 static inline int
xfrm_dev_state_flush_secctx_check(struct net * net,struct net_device * dev,bool task_valid)800 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
801 {
802 return 0;
803 }
804 #endif
805
xfrm_state_flush(struct net * net,u8 proto,bool task_valid,bool sync)806 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
807 {
808 int i, err = 0, cnt = 0;
809
810 spin_lock_bh(&net->xfrm.xfrm_state_lock);
811 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
812 if (err)
813 goto out;
814
815 err = -ESRCH;
816 for (i = 0; i <= net->xfrm.state_hmask; i++) {
817 struct xfrm_state *x;
818 restart:
819 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
820 if (!xfrm_state_kern(x) &&
821 xfrm_id_proto_match(x->id.proto, proto)) {
822 xfrm_state_hold(x);
823 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
824
825 err = xfrm_state_delete(x);
826 xfrm_audit_state_delete(x, err ? 0 : 1,
827 task_valid);
828 if (sync)
829 xfrm_state_put_sync(x);
830 else
831 xfrm_state_put(x);
832 if (!err)
833 cnt++;
834
835 spin_lock_bh(&net->xfrm.xfrm_state_lock);
836 goto restart;
837 }
838 }
839 }
840 out:
841 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
842 if (cnt)
843 err = 0;
844
845 return err;
846 }
847 EXPORT_SYMBOL(xfrm_state_flush);
848
xfrm_dev_state_flush(struct net * net,struct net_device * dev,bool task_valid)849 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
850 {
851 int i, err = 0, cnt = 0;
852
853 spin_lock_bh(&net->xfrm.xfrm_state_lock);
854 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
855 if (err)
856 goto out;
857
858 err = -ESRCH;
859 for (i = 0; i <= net->xfrm.state_hmask; i++) {
860 struct xfrm_state *x;
861 struct xfrm_dev_offload *xso;
862 restart:
863 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
864 xso = &x->xso;
865
866 if (!xfrm_state_kern(x) && xso->dev == dev) {
867 xfrm_state_hold(x);
868 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
869
870 err = xfrm_state_delete(x);
871 xfrm_audit_state_delete(x, err ? 0 : 1,
872 task_valid);
873 xfrm_state_put(x);
874 if (!err)
875 cnt++;
876
877 spin_lock_bh(&net->xfrm.xfrm_state_lock);
878 goto restart;
879 }
880 }
881 }
882 if (cnt)
883 err = 0;
884
885 out:
886 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
887 return err;
888 }
889 EXPORT_SYMBOL(xfrm_dev_state_flush);
890
xfrm_sad_getinfo(struct net * net,struct xfrmk_sadinfo * si)891 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
892 {
893 spin_lock_bh(&net->xfrm.xfrm_state_lock);
894 si->sadcnt = net->xfrm.state_num;
895 si->sadhcnt = net->xfrm.state_hmask + 1;
896 si->sadhmcnt = xfrm_state_hashmax;
897 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
898 }
899 EXPORT_SYMBOL(xfrm_sad_getinfo);
900
901 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)902 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
903 {
904 const struct flowi4 *fl4 = &fl->u.ip4;
905
906 sel->daddr.a4 = fl4->daddr;
907 sel->saddr.a4 = fl4->saddr;
908 sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
909 sel->dport_mask = htons(0xffff);
910 sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
911 sel->sport_mask = htons(0xffff);
912 sel->family = AF_INET;
913 sel->prefixlen_d = 32;
914 sel->prefixlen_s = 32;
915 sel->proto = fl4->flowi4_proto;
916 sel->ifindex = fl4->flowi4_oif;
917 }
918
919 static void
__xfrm6_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)920 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
921 {
922 const struct flowi6 *fl6 = &fl->u.ip6;
923
924 /* Initialize temporary selector matching only to current session. */
925 *(struct in6_addr *)&sel->daddr = fl6->daddr;
926 *(struct in6_addr *)&sel->saddr = fl6->saddr;
927 sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
928 sel->dport_mask = htons(0xffff);
929 sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
930 sel->sport_mask = htons(0xffff);
931 sel->family = AF_INET6;
932 sel->prefixlen_d = 128;
933 sel->prefixlen_s = 128;
934 sel->proto = fl6->flowi6_proto;
935 sel->ifindex = fl6->flowi6_oif;
936 }
937
938 static void
xfrm_init_tempstate(struct xfrm_state * x,const struct flowi * fl,const struct xfrm_tmpl * tmpl,const xfrm_address_t * daddr,const xfrm_address_t * saddr,unsigned short family)939 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
940 const struct xfrm_tmpl *tmpl,
941 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
942 unsigned short family)
943 {
944 switch (family) {
945 case AF_INET:
946 __xfrm4_init_tempsel(&x->sel, fl);
947 break;
948 case AF_INET6:
949 __xfrm6_init_tempsel(&x->sel, fl);
950 break;
951 }
952
953 x->id = tmpl->id;
954
955 switch (tmpl->encap_family) {
956 case AF_INET:
957 if (x->id.daddr.a4 == 0)
958 x->id.daddr.a4 = daddr->a4;
959 x->props.saddr = tmpl->saddr;
960 if (x->props.saddr.a4 == 0)
961 x->props.saddr.a4 = saddr->a4;
962 break;
963 case AF_INET6:
964 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
965 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
966 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
967 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
968 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
969 break;
970 }
971
972 x->props.mode = tmpl->mode;
973 x->props.reqid = tmpl->reqid;
974 x->props.family = tmpl->encap_family;
975 }
976
__xfrm_state_lookup_all(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family,struct xfrm_dev_offload * xdo)977 static struct xfrm_state *__xfrm_state_lookup_all(struct net *net, u32 mark,
978 const xfrm_address_t *daddr,
979 __be32 spi, u8 proto,
980 unsigned short family,
981 struct xfrm_dev_offload *xdo)
982 {
983 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
984 struct xfrm_state *x;
985
986 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
987 #ifdef CONFIG_XFRM_OFFLOAD
988 if (xdo->type == XFRM_DEV_OFFLOAD_PACKET) {
989 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
990 /* HW states are in the head of list, there is
991 * no need to iterate further.
992 */
993 break;
994
995 /* Packet offload: both policy and SA should
996 * have same device.
997 */
998 if (xdo->dev != x->xso.dev)
999 continue;
1000 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1001 /* Skip HW policy for SW lookups */
1002 continue;
1003 #endif
1004 if (x->props.family != family ||
1005 x->id.spi != spi ||
1006 x->id.proto != proto ||
1007 !xfrm_addr_equal(&x->id.daddr, daddr, family))
1008 continue;
1009
1010 if ((mark & x->mark.m) != x->mark.v)
1011 continue;
1012 if (!xfrm_state_hold_rcu(x))
1013 continue;
1014 return x;
1015 }
1016
1017 return NULL;
1018 }
1019
__xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1020 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
1021 const xfrm_address_t *daddr,
1022 __be32 spi, u8 proto,
1023 unsigned short family)
1024 {
1025 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
1026 struct xfrm_state *x;
1027
1028 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
1029 if (x->props.family != family ||
1030 x->id.spi != spi ||
1031 x->id.proto != proto ||
1032 !xfrm_addr_equal(&x->id.daddr, daddr, family))
1033 continue;
1034
1035 if ((mark & x->mark.m) != x->mark.v)
1036 continue;
1037 if (!xfrm_state_hold_rcu(x))
1038 continue;
1039 return x;
1040 }
1041
1042 return NULL;
1043 }
1044
__xfrm_state_lookup_byaddr(struct net * net,u32 mark,const xfrm_address_t * daddr,const xfrm_address_t * saddr,u8 proto,unsigned short family)1045 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1046 const xfrm_address_t *daddr,
1047 const xfrm_address_t *saddr,
1048 u8 proto, unsigned short family)
1049 {
1050 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
1051 struct xfrm_state *x;
1052
1053 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
1054 if (x->props.family != family ||
1055 x->id.proto != proto ||
1056 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1057 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1058 continue;
1059
1060 if ((mark & x->mark.m) != x->mark.v)
1061 continue;
1062 if (!xfrm_state_hold_rcu(x))
1063 continue;
1064 return x;
1065 }
1066
1067 return NULL;
1068 }
1069
1070 static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state * x,int use_spi,int family)1071 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1072 {
1073 struct net *net = xs_net(x);
1074 u32 mark = x->mark.v & x->mark.m;
1075
1076 if (use_spi)
1077 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1078 x->id.spi, x->id.proto, family);
1079 else
1080 return __xfrm_state_lookup_byaddr(net, mark,
1081 &x->id.daddr,
1082 &x->props.saddr,
1083 x->id.proto, family);
1084 }
1085
xfrm_hash_grow_check(struct net * net,int have_hash_collision)1086 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
1087 {
1088 if (have_hash_collision &&
1089 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1090 net->xfrm.state_num > net->xfrm.state_hmask)
1091 schedule_work(&net->xfrm.state_hash_work);
1092 }
1093
xfrm_state_look_at(struct xfrm_policy * pol,struct xfrm_state * x,const struct flowi * fl,unsigned short family,struct xfrm_state ** best,int * acq_in_progress,int * error)1094 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1095 const struct flowi *fl, unsigned short family,
1096 struct xfrm_state **best, int *acq_in_progress,
1097 int *error)
1098 {
1099 /* Resolution logic:
1100 * 1. There is a valid state with matching selector. Done.
1101 * 2. Valid state with inappropriate selector. Skip.
1102 *
1103 * Entering area of "sysdeps".
1104 *
1105 * 3. If state is not valid, selector is temporary, it selects
1106 * only session which triggered previous resolution. Key
1107 * manager will do something to install a state with proper
1108 * selector.
1109 */
1110 if (x->km.state == XFRM_STATE_VALID) {
1111 if ((x->sel.family &&
1112 (x->sel.family != family ||
1113 !xfrm_selector_match(&x->sel, fl, family))) ||
1114 !security_xfrm_state_pol_flow_match(x, pol,
1115 &fl->u.__fl_common))
1116 return;
1117
1118 if (!*best ||
1119 (*best)->km.dying > x->km.dying ||
1120 ((*best)->km.dying == x->km.dying &&
1121 (*best)->curlft.add_time < x->curlft.add_time))
1122 *best = x;
1123 } else if (x->km.state == XFRM_STATE_ACQ) {
1124 *acq_in_progress = 1;
1125 } else if (x->km.state == XFRM_STATE_ERROR ||
1126 x->km.state == XFRM_STATE_EXPIRED) {
1127 if ((!x->sel.family ||
1128 (x->sel.family == family &&
1129 xfrm_selector_match(&x->sel, fl, family))) &&
1130 security_xfrm_state_pol_flow_match(x, pol,
1131 &fl->u.__fl_common))
1132 *error = -ESRCH;
1133 }
1134 }
1135
1136 struct xfrm_state *
xfrm_state_find(const xfrm_address_t * daddr,const xfrm_address_t * saddr,const struct flowi * fl,struct xfrm_tmpl * tmpl,struct xfrm_policy * pol,int * err,unsigned short family,u32 if_id)1137 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1138 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1139 struct xfrm_policy *pol, int *err,
1140 unsigned short family, u32 if_id)
1141 {
1142 static xfrm_address_t saddr_wildcard = { };
1143 struct net *net = xp_net(pol);
1144 unsigned int h, h_wildcard;
1145 struct xfrm_state *x, *x0, *to_put;
1146 int acquire_in_progress = 0;
1147 int error = 0;
1148 struct xfrm_state *best = NULL;
1149 u32 mark = pol->mark.v & pol->mark.m;
1150 unsigned short encap_family = tmpl->encap_family;
1151 unsigned int sequence;
1152 struct km_event c;
1153
1154 to_put = NULL;
1155
1156 sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1157
1158 rcu_read_lock();
1159 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1160 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1161 #ifdef CONFIG_XFRM_OFFLOAD
1162 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1163 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1164 /* HW states are in the head of list, there is
1165 * no need to iterate further.
1166 */
1167 break;
1168
1169 /* Packet offload: both policy and SA should
1170 * have same device.
1171 */
1172 if (pol->xdo.dev != x->xso.dev)
1173 continue;
1174 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1175 /* Skip HW policy for SW lookups */
1176 continue;
1177 #endif
1178 if (x->props.family == encap_family &&
1179 x->props.reqid == tmpl->reqid &&
1180 (mark & x->mark.m) == x->mark.v &&
1181 x->if_id == if_id &&
1182 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1183 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1184 tmpl->mode == x->props.mode &&
1185 tmpl->id.proto == x->id.proto &&
1186 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1187 xfrm_state_look_at(pol, x, fl, family,
1188 &best, &acquire_in_progress, &error);
1189 }
1190 if (best || acquire_in_progress)
1191 goto found;
1192
1193 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1194 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1195 #ifdef CONFIG_XFRM_OFFLOAD
1196 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1197 if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET)
1198 /* HW states are in the head of list, there is
1199 * no need to iterate further.
1200 */
1201 break;
1202
1203 /* Packet offload: both policy and SA should
1204 * have same device.
1205 */
1206 if (pol->xdo.dev != x->xso.dev)
1207 continue;
1208 } else if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET)
1209 /* Skip HW policy for SW lookups */
1210 continue;
1211 #endif
1212 if (x->props.family == encap_family &&
1213 x->props.reqid == tmpl->reqid &&
1214 (mark & x->mark.m) == x->mark.v &&
1215 x->if_id == if_id &&
1216 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1217 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1218 tmpl->mode == x->props.mode &&
1219 tmpl->id.proto == x->id.proto &&
1220 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1221 xfrm_state_look_at(pol, x, fl, family,
1222 &best, &acquire_in_progress, &error);
1223 }
1224
1225 found:
1226 x = best;
1227 if (!x && !error && !acquire_in_progress) {
1228 if (tmpl->id.spi &&
1229 (x0 = __xfrm_state_lookup_all(net, mark, daddr,
1230 tmpl->id.spi, tmpl->id.proto,
1231 encap_family,
1232 &pol->xdo)) != NULL) {
1233 to_put = x0;
1234 error = -EEXIST;
1235 goto out;
1236 }
1237
1238 c.net = net;
1239 /* If the KMs have no listeners (yet...), avoid allocating an SA
1240 * for each and every packet - garbage collection might not
1241 * handle the flood.
1242 */
1243 if (!km_is_alive(&c)) {
1244 error = -ESRCH;
1245 goto out;
1246 }
1247
1248 x = xfrm_state_alloc(net);
1249 if (x == NULL) {
1250 error = -ENOMEM;
1251 goto out;
1252 }
1253 /* Initialize temporary state matching only
1254 * to current session. */
1255 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1256 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1257 x->if_id = if_id;
1258
1259 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1260 if (error) {
1261 x->km.state = XFRM_STATE_DEAD;
1262 to_put = x;
1263 x = NULL;
1264 goto out;
1265 }
1266 #ifdef CONFIG_XFRM_OFFLOAD
1267 if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
1268 struct xfrm_dev_offload *xdo = &pol->xdo;
1269 struct xfrm_dev_offload *xso = &x->xso;
1270
1271 xso->type = XFRM_DEV_OFFLOAD_PACKET;
1272 xso->dir = xdo->dir;
1273 xso->dev = xdo->dev;
1274 xso->real_dev = xdo->real_dev;
1275 xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ;
1276 netdev_tracker_alloc(xso->dev, &xso->dev_tracker,
1277 GFP_ATOMIC);
1278 error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
1279 if (error) {
1280 xso->dir = 0;
1281 netdev_put(xso->dev, &xso->dev_tracker);
1282 xso->dev = NULL;
1283 xso->real_dev = NULL;
1284 xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
1285 x->km.state = XFRM_STATE_DEAD;
1286 to_put = x;
1287 x = NULL;
1288 goto out;
1289 }
1290 }
1291 #endif
1292 if (km_query(x, tmpl, pol) == 0) {
1293 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1294 x->km.state = XFRM_STATE_ACQ;
1295 x->dir = XFRM_SA_DIR_OUT;
1296 list_add(&x->km.all, &net->xfrm.state_all);
1297 XFRM_STATE_INSERT(bydst, &x->bydst,
1298 net->xfrm.state_bydst + h,
1299 x->xso.type);
1300 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1301 XFRM_STATE_INSERT(bysrc, &x->bysrc,
1302 net->xfrm.state_bysrc + h,
1303 x->xso.type);
1304 if (x->id.spi) {
1305 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1306 XFRM_STATE_INSERT(byspi, &x->byspi,
1307 net->xfrm.state_byspi + h,
1308 x->xso.type);
1309 }
1310 if (x->km.seq) {
1311 h = xfrm_seq_hash(net, x->km.seq);
1312 XFRM_STATE_INSERT(byseq, &x->byseq,
1313 net->xfrm.state_byseq + h,
1314 x->xso.type);
1315 }
1316 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1317 hrtimer_start(&x->mtimer,
1318 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1319 HRTIMER_MODE_REL_SOFT);
1320 net->xfrm.state_num++;
1321 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1322 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1323 } else {
1324 #ifdef CONFIG_XFRM_OFFLOAD
1325 struct xfrm_dev_offload *xso = &x->xso;
1326
1327 if (xso->type == XFRM_DEV_OFFLOAD_PACKET) {
1328 xfrm_dev_state_delete(x);
1329 xfrm_dev_state_free(x);
1330 }
1331 #endif
1332 x->km.state = XFRM_STATE_DEAD;
1333 to_put = x;
1334 x = NULL;
1335 error = -ESRCH;
1336 }
1337 }
1338 out:
1339 if (x) {
1340 if (!xfrm_state_hold_rcu(x)) {
1341 *err = -EAGAIN;
1342 x = NULL;
1343 }
1344 } else {
1345 *err = acquire_in_progress ? -EAGAIN : error;
1346 }
1347 rcu_read_unlock();
1348 if (to_put)
1349 xfrm_state_put(to_put);
1350
1351 if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1352 *err = -EAGAIN;
1353 if (x) {
1354 xfrm_state_put(x);
1355 x = NULL;
1356 }
1357 }
1358
1359 return x;
1360 }
1361
1362 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)1363 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1364 xfrm_address_t *daddr, xfrm_address_t *saddr,
1365 unsigned short family, u8 mode, u8 proto, u32 reqid)
1366 {
1367 unsigned int h;
1368 struct xfrm_state *rx = NULL, *x = NULL;
1369
1370 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1371 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1372 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1373 if (x->props.family == family &&
1374 x->props.reqid == reqid &&
1375 (mark & x->mark.m) == x->mark.v &&
1376 x->if_id == if_id &&
1377 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1378 xfrm_state_addr_check(x, daddr, saddr, family) &&
1379 mode == x->props.mode &&
1380 proto == x->id.proto &&
1381 x->km.state == XFRM_STATE_VALID) {
1382 rx = x;
1383 break;
1384 }
1385 }
1386
1387 if (rx)
1388 xfrm_state_hold(rx);
1389 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1390
1391
1392 return rx;
1393 }
1394 EXPORT_SYMBOL(xfrm_stateonly_find);
1395
xfrm_state_lookup_byspi(struct net * net,__be32 spi,unsigned short family)1396 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1397 unsigned short family)
1398 {
1399 struct xfrm_state *x;
1400 struct xfrm_state_walk *w;
1401
1402 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1403 list_for_each_entry(w, &net->xfrm.state_all, all) {
1404 x = container_of(w, struct xfrm_state, km);
1405 if (x->props.family != family ||
1406 x->id.spi != spi)
1407 continue;
1408
1409 xfrm_state_hold(x);
1410 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1411 return x;
1412 }
1413 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1414 return NULL;
1415 }
1416 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1417
__xfrm_state_insert(struct xfrm_state * x)1418 static void __xfrm_state_insert(struct xfrm_state *x)
1419 {
1420 struct net *net = xs_net(x);
1421 unsigned int h;
1422
1423 list_add(&x->km.all, &net->xfrm.state_all);
1424
1425 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1426 x->props.reqid, x->props.family);
1427 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1428 x->xso.type);
1429
1430 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1431 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1432 x->xso.type);
1433
1434 if (x->id.spi) {
1435 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1436 x->props.family);
1437
1438 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
1439 x->xso.type);
1440 }
1441
1442 if (x->km.seq) {
1443 h = xfrm_seq_hash(net, x->km.seq);
1444
1445 XFRM_STATE_INSERT(byseq, &x->byseq, net->xfrm.state_byseq + h,
1446 x->xso.type);
1447 }
1448
1449 hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1450 if (x->replay_maxage)
1451 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1452
1453 net->xfrm.state_num++;
1454
1455 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1456 }
1457
1458 /* net->xfrm.xfrm_state_lock is held */
__xfrm_state_bump_genids(struct xfrm_state * xnew)1459 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1460 {
1461 struct net *net = xs_net(xnew);
1462 unsigned short family = xnew->props.family;
1463 u32 reqid = xnew->props.reqid;
1464 struct xfrm_state *x;
1465 unsigned int h;
1466 u32 mark = xnew->mark.v & xnew->mark.m;
1467 u32 if_id = xnew->if_id;
1468
1469 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1470 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1471 if (x->props.family == family &&
1472 x->props.reqid == reqid &&
1473 x->if_id == if_id &&
1474 (mark & x->mark.m) == x->mark.v &&
1475 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1476 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1477 x->genid++;
1478 }
1479 }
1480
xfrm_state_insert(struct xfrm_state * x)1481 void xfrm_state_insert(struct xfrm_state *x)
1482 {
1483 struct net *net = xs_net(x);
1484
1485 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1486 __xfrm_state_bump_genids(x);
1487 __xfrm_state_insert(x);
1488 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1489 }
1490 EXPORT_SYMBOL(xfrm_state_insert);
1491
1492 /* 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)1493 static struct xfrm_state *__find_acq_core(struct net *net,
1494 const struct xfrm_mark *m,
1495 unsigned short family, u8 mode,
1496 u32 reqid, u32 if_id, u8 proto,
1497 const xfrm_address_t *daddr,
1498 const xfrm_address_t *saddr,
1499 int create)
1500 {
1501 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1502 struct xfrm_state *x;
1503 u32 mark = m->v & m->m;
1504
1505 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1506 if (x->props.reqid != reqid ||
1507 x->props.mode != mode ||
1508 x->props.family != family ||
1509 x->km.state != XFRM_STATE_ACQ ||
1510 x->id.spi != 0 ||
1511 x->id.proto != proto ||
1512 (mark & x->mark.m) != x->mark.v ||
1513 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1514 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1515 continue;
1516
1517 xfrm_state_hold(x);
1518 return x;
1519 }
1520
1521 if (!create)
1522 return NULL;
1523
1524 x = xfrm_state_alloc(net);
1525 if (likely(x)) {
1526 switch (family) {
1527 case AF_INET:
1528 x->sel.daddr.a4 = daddr->a4;
1529 x->sel.saddr.a4 = saddr->a4;
1530 x->sel.prefixlen_d = 32;
1531 x->sel.prefixlen_s = 32;
1532 x->props.saddr.a4 = saddr->a4;
1533 x->id.daddr.a4 = daddr->a4;
1534 break;
1535
1536 case AF_INET6:
1537 x->sel.daddr.in6 = daddr->in6;
1538 x->sel.saddr.in6 = saddr->in6;
1539 x->sel.prefixlen_d = 128;
1540 x->sel.prefixlen_s = 128;
1541 x->props.saddr.in6 = saddr->in6;
1542 x->id.daddr.in6 = daddr->in6;
1543 break;
1544 }
1545
1546 x->km.state = XFRM_STATE_ACQ;
1547 x->id.proto = proto;
1548 x->props.family = family;
1549 x->props.mode = mode;
1550 x->props.reqid = reqid;
1551 x->if_id = if_id;
1552 x->mark.v = m->v;
1553 x->mark.m = m->m;
1554 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1555 xfrm_state_hold(x);
1556 hrtimer_start(&x->mtimer,
1557 ktime_set(net->xfrm.sysctl_acq_expires, 0),
1558 HRTIMER_MODE_REL_SOFT);
1559 list_add(&x->km.all, &net->xfrm.state_all);
1560 XFRM_STATE_INSERT(bydst, &x->bydst, net->xfrm.state_bydst + h,
1561 x->xso.type);
1562 h = xfrm_src_hash(net, daddr, saddr, family);
1563 XFRM_STATE_INSERT(bysrc, &x->bysrc, net->xfrm.state_bysrc + h,
1564 x->xso.type);
1565
1566 net->xfrm.state_num++;
1567
1568 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1569 }
1570
1571 return x;
1572 }
1573
1574 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1575
xfrm_state_add(struct xfrm_state * x)1576 int xfrm_state_add(struct xfrm_state *x)
1577 {
1578 struct net *net = xs_net(x);
1579 struct xfrm_state *x1, *to_put;
1580 int family;
1581 int err;
1582 u32 mark = x->mark.v & x->mark.m;
1583 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1584
1585 family = x->props.family;
1586
1587 to_put = NULL;
1588
1589 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1590
1591 x1 = __xfrm_state_locate(x, use_spi, family);
1592 if (x1) {
1593 to_put = x1;
1594 x1 = NULL;
1595 err = -EEXIST;
1596 goto out;
1597 }
1598
1599 if (use_spi && x->km.seq) {
1600 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1601 if (x1 && ((x1->id.proto != x->id.proto) ||
1602 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1603 to_put = x1;
1604 x1 = NULL;
1605 }
1606 }
1607
1608 if (use_spi && !x1)
1609 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1610 x->props.reqid, x->if_id, x->id.proto,
1611 &x->id.daddr, &x->props.saddr, 0);
1612
1613 __xfrm_state_bump_genids(x);
1614 __xfrm_state_insert(x);
1615 err = 0;
1616
1617 out:
1618 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1619
1620 if (x1) {
1621 xfrm_state_delete(x1);
1622 xfrm_state_put(x1);
1623 }
1624
1625 if (to_put)
1626 xfrm_state_put(to_put);
1627
1628 return err;
1629 }
1630 EXPORT_SYMBOL(xfrm_state_add);
1631
1632 #ifdef CONFIG_XFRM_MIGRATE
clone_security(struct xfrm_state * x,struct xfrm_sec_ctx * security)1633 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1634 {
1635 struct xfrm_user_sec_ctx *uctx;
1636 int size = sizeof(*uctx) + security->ctx_len;
1637 int err;
1638
1639 uctx = kmalloc(size, GFP_KERNEL);
1640 if (!uctx)
1641 return -ENOMEM;
1642
1643 uctx->exttype = XFRMA_SEC_CTX;
1644 uctx->len = size;
1645 uctx->ctx_doi = security->ctx_doi;
1646 uctx->ctx_alg = security->ctx_alg;
1647 uctx->ctx_len = security->ctx_len;
1648 memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1649 err = security_xfrm_state_alloc(x, uctx);
1650 kfree(uctx);
1651 if (err)
1652 return err;
1653
1654 return 0;
1655 }
1656
xfrm_state_clone(struct xfrm_state * orig,struct xfrm_encap_tmpl * encap)1657 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1658 struct xfrm_encap_tmpl *encap)
1659 {
1660 struct net *net = xs_net(orig);
1661 struct xfrm_state *x = xfrm_state_alloc(net);
1662 if (!x)
1663 goto out;
1664
1665 memcpy(&x->id, &orig->id, sizeof(x->id));
1666 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1667 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1668 x->props.mode = orig->props.mode;
1669 x->props.replay_window = orig->props.replay_window;
1670 x->props.reqid = orig->props.reqid;
1671 x->props.family = orig->props.family;
1672 x->props.saddr = orig->props.saddr;
1673
1674 if (orig->aalg) {
1675 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1676 if (!x->aalg)
1677 goto error;
1678 }
1679 x->props.aalgo = orig->props.aalgo;
1680
1681 if (orig->aead) {
1682 x->aead = xfrm_algo_aead_clone(orig->aead);
1683 x->geniv = orig->geniv;
1684 if (!x->aead)
1685 goto error;
1686 }
1687 if (orig->ealg) {
1688 x->ealg = xfrm_algo_clone(orig->ealg);
1689 if (!x->ealg)
1690 goto error;
1691 }
1692 x->props.ealgo = orig->props.ealgo;
1693
1694 if (orig->calg) {
1695 x->calg = xfrm_algo_clone(orig->calg);
1696 if (!x->calg)
1697 goto error;
1698 }
1699 x->props.calgo = orig->props.calgo;
1700
1701 if (encap || orig->encap) {
1702 if (encap)
1703 x->encap = kmemdup(encap, sizeof(*x->encap),
1704 GFP_KERNEL);
1705 else
1706 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1707 GFP_KERNEL);
1708
1709 if (!x->encap)
1710 goto error;
1711 }
1712
1713 if (orig->security)
1714 if (clone_security(x, orig->security))
1715 goto error;
1716
1717 if (orig->coaddr) {
1718 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1719 GFP_KERNEL);
1720 if (!x->coaddr)
1721 goto error;
1722 }
1723
1724 if (orig->replay_esn) {
1725 if (xfrm_replay_clone(x, orig))
1726 goto error;
1727 }
1728
1729 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1730 memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1731
1732 x->props.flags = orig->props.flags;
1733 x->props.extra_flags = orig->props.extra_flags;
1734
1735 x->if_id = orig->if_id;
1736 x->tfcpad = orig->tfcpad;
1737 x->replay_maxdiff = orig->replay_maxdiff;
1738 x->replay_maxage = orig->replay_maxage;
1739 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1740 x->km.state = orig->km.state;
1741 x->km.seq = orig->km.seq;
1742 x->replay = orig->replay;
1743 x->preplay = orig->preplay;
1744 x->mapping_maxage = orig->mapping_maxage;
1745 x->lastused = orig->lastused;
1746 x->new_mapping = 0;
1747 x->new_mapping_sport = 0;
1748 x->dir = orig->dir;
1749
1750 return x;
1751
1752 error:
1753 xfrm_state_put(x);
1754 out:
1755 return NULL;
1756 }
1757
xfrm_migrate_state_find(struct xfrm_migrate * m,struct net * net,u32 if_id)1758 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
1759 u32 if_id)
1760 {
1761 unsigned int h;
1762 struct xfrm_state *x = NULL;
1763
1764 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1765
1766 if (m->reqid) {
1767 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1768 m->reqid, m->old_family);
1769 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1770 if (x->props.mode != m->mode ||
1771 x->id.proto != m->proto)
1772 continue;
1773 if (m->reqid && x->props.reqid != m->reqid)
1774 continue;
1775 if (if_id != 0 && x->if_id != if_id)
1776 continue;
1777 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1778 m->old_family) ||
1779 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1780 m->old_family))
1781 continue;
1782 xfrm_state_hold(x);
1783 break;
1784 }
1785 } else {
1786 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1787 m->old_family);
1788 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1789 if (x->props.mode != m->mode ||
1790 x->id.proto != m->proto)
1791 continue;
1792 if (if_id != 0 && x->if_id != if_id)
1793 continue;
1794 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1795 m->old_family) ||
1796 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1797 m->old_family))
1798 continue;
1799 xfrm_state_hold(x);
1800 break;
1801 }
1802 }
1803
1804 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1805
1806 return x;
1807 }
1808 EXPORT_SYMBOL(xfrm_migrate_state_find);
1809
xfrm_state_migrate(struct xfrm_state * x,struct xfrm_migrate * m,struct xfrm_encap_tmpl * encap)1810 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1811 struct xfrm_migrate *m,
1812 struct xfrm_encap_tmpl *encap)
1813 {
1814 struct xfrm_state *xc;
1815
1816 xc = xfrm_state_clone(x, encap);
1817 if (!xc)
1818 return NULL;
1819
1820 xc->props.family = m->new_family;
1821
1822 if (xfrm_init_state(xc) < 0)
1823 goto error;
1824
1825 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1826 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1827
1828 /* add state */
1829 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1830 /* a care is needed when the destination address of the
1831 state is to be updated as it is a part of triplet */
1832 xfrm_state_insert(xc);
1833 } else {
1834 if (xfrm_state_add(xc) < 0)
1835 goto error;
1836 }
1837
1838 return xc;
1839 error:
1840 xfrm_state_put(xc);
1841 return NULL;
1842 }
1843 EXPORT_SYMBOL(xfrm_state_migrate);
1844 #endif
1845
xfrm_state_update(struct xfrm_state * x)1846 int xfrm_state_update(struct xfrm_state *x)
1847 {
1848 struct xfrm_state *x1, *to_put;
1849 int err;
1850 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1851 struct net *net = xs_net(x);
1852
1853 to_put = NULL;
1854
1855 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1856 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1857
1858 err = -ESRCH;
1859 if (!x1)
1860 goto out;
1861
1862 if (xfrm_state_kern(x1)) {
1863 to_put = x1;
1864 err = -EEXIST;
1865 goto out;
1866 }
1867
1868 if (x1->km.state == XFRM_STATE_ACQ) {
1869 if (x->dir && x1->dir != x->dir)
1870 goto out;
1871
1872 __xfrm_state_insert(x);
1873 x = NULL;
1874 } else {
1875 if (x1->dir != x->dir)
1876 goto out;
1877 }
1878 err = 0;
1879
1880 out:
1881 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1882
1883 if (to_put)
1884 xfrm_state_put(to_put);
1885
1886 if (err)
1887 return err;
1888
1889 if (!x) {
1890 xfrm_state_delete(x1);
1891 xfrm_state_put(x1);
1892 return 0;
1893 }
1894
1895 err = -EINVAL;
1896 spin_lock_bh(&x1->lock);
1897 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1898 if (x->encap && x1->encap &&
1899 x->encap->encap_type == x1->encap->encap_type)
1900 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1901 else if (x->encap || x1->encap)
1902 goto fail;
1903
1904 if (x->coaddr && x1->coaddr) {
1905 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1906 }
1907 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1908 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1909 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1910 x1->km.dying = 0;
1911
1912 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1913 HRTIMER_MODE_REL_SOFT);
1914 if (READ_ONCE(x1->curlft.use_time))
1915 xfrm_state_check_expire(x1);
1916
1917 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1918 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1919
1920 if (x->props.smark.m || x->props.smark.v)
1921 x1->props.smark = x->props.smark;
1922
1923 if (x->if_id)
1924 x1->if_id = x->if_id;
1925
1926 __xfrm_state_bump_genids(x1);
1927 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1928 }
1929
1930 err = 0;
1931 x->km.state = XFRM_STATE_DEAD;
1932 __xfrm_state_put(x);
1933 }
1934
1935 fail:
1936 spin_unlock_bh(&x1->lock);
1937
1938 xfrm_state_put(x1);
1939
1940 return err;
1941 }
1942 EXPORT_SYMBOL(xfrm_state_update);
1943
xfrm_state_check_expire(struct xfrm_state * x)1944 int xfrm_state_check_expire(struct xfrm_state *x)
1945 {
1946 xfrm_dev_state_update_stats(x);
1947
1948 if (!READ_ONCE(x->curlft.use_time))
1949 WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds());
1950
1951 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1952 x->curlft.packets >= x->lft.hard_packet_limit) {
1953 x->km.state = XFRM_STATE_EXPIRED;
1954 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1955 return -EINVAL;
1956 }
1957
1958 if (!x->km.dying &&
1959 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1960 x->curlft.packets >= x->lft.soft_packet_limit)) {
1961 x->km.dying = 1;
1962 km_state_expired(x, 0, 0);
1963 }
1964 return 0;
1965 }
1966 EXPORT_SYMBOL(xfrm_state_check_expire);
1967
xfrm_state_update_stats(struct net * net)1968 void xfrm_state_update_stats(struct net *net)
1969 {
1970 struct xfrm_state *x;
1971 int i;
1972
1973 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1974 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1975 hlist_for_each_entry(x, net->xfrm.state_bydst + i, bydst)
1976 xfrm_dev_state_update_stats(x);
1977 }
1978 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1979 }
1980
1981 struct xfrm_state *
xfrm_state_lookup(struct net * net,u32 mark,const xfrm_address_t * daddr,__be32 spi,u8 proto,unsigned short family)1982 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1983 u8 proto, unsigned short family)
1984 {
1985 struct xfrm_state *x;
1986
1987 rcu_read_lock();
1988 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1989 rcu_read_unlock();
1990 return x;
1991 }
1992 EXPORT_SYMBOL(xfrm_state_lookup);
1993
1994 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)1995 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1996 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1997 u8 proto, unsigned short family)
1998 {
1999 struct xfrm_state *x;
2000
2001 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2002 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
2003 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2004 return x;
2005 }
2006 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
2007
2008 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)2009 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
2010 u32 if_id, u8 proto, const xfrm_address_t *daddr,
2011 const xfrm_address_t *saddr, int create, unsigned short family)
2012 {
2013 struct xfrm_state *x;
2014
2015 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2016 x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
2017 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2018
2019 return x;
2020 }
2021 EXPORT_SYMBOL(xfrm_find_acq);
2022
2023 #ifdef CONFIG_XFRM_SUB_POLICY
2024 #if IS_ENABLED(CONFIG_IPV6)
2025 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
2026 static void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2027 __xfrm6_sort(void **dst, void **src, int n,
2028 int (*cmp)(const void *p), int maxclass)
2029 {
2030 int count[XFRM_MAX_DEPTH] = { };
2031 int class[XFRM_MAX_DEPTH];
2032 int i;
2033
2034 for (i = 0; i < n; i++) {
2035 int c = cmp(src[i]);
2036
2037 class[i] = c;
2038 count[c]++;
2039 }
2040
2041 for (i = 2; i < maxclass; i++)
2042 count[i] += count[i - 1];
2043
2044 for (i = 0; i < n; i++) {
2045 dst[count[class[i] - 1]++] = src[i];
2046 src[i] = NULL;
2047 }
2048 }
2049
2050 /* Rule for xfrm_state:
2051 *
2052 * rule 1: select IPsec transport except AH
2053 * rule 2: select MIPv6 RO or inbound trigger
2054 * rule 3: select IPsec transport AH
2055 * rule 4: select IPsec tunnel
2056 * rule 5: others
2057 */
__xfrm6_state_sort_cmp(const void * p)2058 static int __xfrm6_state_sort_cmp(const void *p)
2059 {
2060 const struct xfrm_state *v = p;
2061
2062 switch (v->props.mode) {
2063 case XFRM_MODE_TRANSPORT:
2064 if (v->id.proto != IPPROTO_AH)
2065 return 1;
2066 else
2067 return 3;
2068 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2069 case XFRM_MODE_ROUTEOPTIMIZATION:
2070 case XFRM_MODE_IN_TRIGGER:
2071 return 2;
2072 #endif
2073 case XFRM_MODE_TUNNEL:
2074 case XFRM_MODE_BEET:
2075 return 4;
2076 }
2077 return 5;
2078 }
2079
2080 /* Rule for xfrm_tmpl:
2081 *
2082 * rule 1: select IPsec transport
2083 * rule 2: select MIPv6 RO or inbound trigger
2084 * rule 3: select IPsec tunnel
2085 * rule 4: others
2086 */
__xfrm6_tmpl_sort_cmp(const void * p)2087 static int __xfrm6_tmpl_sort_cmp(const void *p)
2088 {
2089 const struct xfrm_tmpl *v = p;
2090
2091 switch (v->mode) {
2092 case XFRM_MODE_TRANSPORT:
2093 return 1;
2094 #if IS_ENABLED(CONFIG_IPV6_MIP6)
2095 case XFRM_MODE_ROUTEOPTIMIZATION:
2096 case XFRM_MODE_IN_TRIGGER:
2097 return 2;
2098 #endif
2099 case XFRM_MODE_TUNNEL:
2100 case XFRM_MODE_BEET:
2101 return 3;
2102 }
2103 return 4;
2104 }
2105 #else
__xfrm6_state_sort_cmp(const void * p)2106 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
__xfrm6_tmpl_sort_cmp(const void * p)2107 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
2108
2109 static inline void
__xfrm6_sort(void ** dst,void ** src,int n,int (* cmp)(const void * p),int maxclass)2110 __xfrm6_sort(void **dst, void **src, int n,
2111 int (*cmp)(const void *p), int maxclass)
2112 {
2113 int i;
2114
2115 for (i = 0; i < n; i++)
2116 dst[i] = src[i];
2117 }
2118 #endif /* CONFIG_IPV6 */
2119
2120 void
xfrm_tmpl_sort(struct xfrm_tmpl ** dst,struct xfrm_tmpl ** src,int n,unsigned short family)2121 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
2122 unsigned short family)
2123 {
2124 int i;
2125
2126 if (family == AF_INET6)
2127 __xfrm6_sort((void **)dst, (void **)src, n,
2128 __xfrm6_tmpl_sort_cmp, 5);
2129 else
2130 for (i = 0; i < n; i++)
2131 dst[i] = src[i];
2132 }
2133
2134 void
xfrm_state_sort(struct xfrm_state ** dst,struct xfrm_state ** src,int n,unsigned short family)2135 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
2136 unsigned short family)
2137 {
2138 int i;
2139
2140 if (family == AF_INET6)
2141 __xfrm6_sort((void **)dst, (void **)src, n,
2142 __xfrm6_state_sort_cmp, 6);
2143 else
2144 for (i = 0; i < n; i++)
2145 dst[i] = src[i];
2146 }
2147 #endif
2148
2149 /* Silly enough, but I'm lazy to build resolution list */
2150
__xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2151 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2152 {
2153 unsigned int h = xfrm_seq_hash(net, seq);
2154 struct xfrm_state *x;
2155
2156 hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
2157 if (x->km.seq == seq &&
2158 (mark & x->mark.m) == x->mark.v &&
2159 x->km.state == XFRM_STATE_ACQ) {
2160 xfrm_state_hold(x);
2161 return x;
2162 }
2163 }
2164
2165 return NULL;
2166 }
2167
xfrm_find_acq_byseq(struct net * net,u32 mark,u32 seq)2168 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
2169 {
2170 struct xfrm_state *x;
2171
2172 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2173 x = __xfrm_find_acq_byseq(net, mark, seq);
2174 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2175 return x;
2176 }
2177 EXPORT_SYMBOL(xfrm_find_acq_byseq);
2178
xfrm_get_acqseq(void)2179 u32 xfrm_get_acqseq(void)
2180 {
2181 u32 res;
2182 static atomic_t acqseq;
2183
2184 do {
2185 res = atomic_inc_return(&acqseq);
2186 } while (!res);
2187
2188 return res;
2189 }
2190 EXPORT_SYMBOL(xfrm_get_acqseq);
2191
verify_spi_info(u8 proto,u32 min,u32 max,struct netlink_ext_ack * extack)2192 int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack)
2193 {
2194 switch (proto) {
2195 case IPPROTO_AH:
2196 case IPPROTO_ESP:
2197 break;
2198
2199 case IPPROTO_COMP:
2200 /* IPCOMP spi is 16-bits. */
2201 if (max >= 0x10000) {
2202 NL_SET_ERR_MSG(extack, "IPCOMP SPI must be <= 65535");
2203 return -EINVAL;
2204 }
2205 break;
2206
2207 default:
2208 NL_SET_ERR_MSG(extack, "Invalid protocol, must be one of AH, ESP, IPCOMP");
2209 return -EINVAL;
2210 }
2211
2212 if (min > max) {
2213 NL_SET_ERR_MSG(extack, "Invalid SPI range: min > max");
2214 return -EINVAL;
2215 }
2216
2217 return 0;
2218 }
2219 EXPORT_SYMBOL(verify_spi_info);
2220
xfrm_alloc_spi(struct xfrm_state * x,u32 low,u32 high,struct netlink_ext_ack * extack)2221 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high,
2222 struct netlink_ext_ack *extack)
2223 {
2224 struct net *net = xs_net(x);
2225 unsigned int h;
2226 struct xfrm_state *x0;
2227 int err = -ENOENT;
2228 __be32 minspi = htonl(low);
2229 __be32 maxspi = htonl(high);
2230 __be32 newspi = 0;
2231 u32 mark = x->mark.v & x->mark.m;
2232
2233 spin_lock_bh(&x->lock);
2234 if (x->km.state == XFRM_STATE_DEAD) {
2235 NL_SET_ERR_MSG(extack, "Target ACQUIRE is in DEAD state");
2236 goto unlock;
2237 }
2238
2239 err = 0;
2240 if (x->id.spi)
2241 goto unlock;
2242
2243 err = -ENOENT;
2244
2245 if (minspi == maxspi) {
2246 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2247 if (x0) {
2248 NL_SET_ERR_MSG(extack, "Requested SPI is already in use");
2249 xfrm_state_put(x0);
2250 goto unlock;
2251 }
2252 newspi = minspi;
2253 } else {
2254 u32 spi = 0;
2255 for (h = 0; h < high-low+1; h++) {
2256 spi = get_random_u32_inclusive(low, high);
2257 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2258 if (x0 == NULL) {
2259 newspi = htonl(spi);
2260 break;
2261 }
2262 xfrm_state_put(x0);
2263 }
2264 }
2265 if (newspi) {
2266 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2267 x->id.spi = newspi;
2268 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2269 XFRM_STATE_INSERT(byspi, &x->byspi, net->xfrm.state_byspi + h,
2270 x->xso.type);
2271 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2272
2273 err = 0;
2274 } else {
2275 NL_SET_ERR_MSG(extack, "No SPI available in the requested range");
2276 }
2277
2278 unlock:
2279 spin_unlock_bh(&x->lock);
2280
2281 return err;
2282 }
2283 EXPORT_SYMBOL(xfrm_alloc_spi);
2284
__xfrm_state_filter_match(struct xfrm_state * x,struct xfrm_address_filter * filter)2285 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2286 struct xfrm_address_filter *filter)
2287 {
2288 if (filter) {
2289 if ((filter->family == AF_INET ||
2290 filter->family == AF_INET6) &&
2291 x->props.family != filter->family)
2292 return false;
2293
2294 return addr_match(&x->props.saddr, &filter->saddr,
2295 filter->splen) &&
2296 addr_match(&x->id.daddr, &filter->daddr,
2297 filter->dplen);
2298 }
2299 return true;
2300 }
2301
xfrm_state_walk(struct net * net,struct xfrm_state_walk * walk,int (* func)(struct xfrm_state *,int,void *),void * data)2302 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2303 int (*func)(struct xfrm_state *, int, void*),
2304 void *data)
2305 {
2306 struct xfrm_state *state;
2307 struct xfrm_state_walk *x;
2308 int err = 0;
2309
2310 if (walk->seq != 0 && list_empty(&walk->all))
2311 return 0;
2312
2313 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2314 if (list_empty(&walk->all))
2315 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2316 else
2317 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2318 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2319 if (x->state == XFRM_STATE_DEAD)
2320 continue;
2321 state = container_of(x, struct xfrm_state, km);
2322 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2323 continue;
2324 if (!__xfrm_state_filter_match(state, walk->filter))
2325 continue;
2326 err = func(state, walk->seq, data);
2327 if (err) {
2328 list_move_tail(&walk->all, &x->all);
2329 goto out;
2330 }
2331 walk->seq++;
2332 }
2333 if (walk->seq == 0) {
2334 err = -ENOENT;
2335 goto out;
2336 }
2337 list_del_init(&walk->all);
2338 out:
2339 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2340 return err;
2341 }
2342 EXPORT_SYMBOL(xfrm_state_walk);
2343
xfrm_state_walk_init(struct xfrm_state_walk * walk,u8 proto,struct xfrm_address_filter * filter)2344 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2345 struct xfrm_address_filter *filter)
2346 {
2347 INIT_LIST_HEAD(&walk->all);
2348 walk->proto = proto;
2349 walk->state = XFRM_STATE_DEAD;
2350 walk->seq = 0;
2351 walk->filter = filter;
2352 }
2353 EXPORT_SYMBOL(xfrm_state_walk_init);
2354
xfrm_state_walk_done(struct xfrm_state_walk * walk,struct net * net)2355 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2356 {
2357 kfree(walk->filter);
2358
2359 if (list_empty(&walk->all))
2360 return;
2361
2362 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2363 list_del(&walk->all);
2364 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2365 }
2366 EXPORT_SYMBOL(xfrm_state_walk_done);
2367
xfrm_replay_timer_handler(struct timer_list * t)2368 static void xfrm_replay_timer_handler(struct timer_list *t)
2369 {
2370 struct xfrm_state *x = from_timer(x, t, rtimer);
2371
2372 spin_lock(&x->lock);
2373
2374 if (x->km.state == XFRM_STATE_VALID) {
2375 if (xfrm_aevent_is_on(xs_net(x)))
2376 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2377 else
2378 x->xflags |= XFRM_TIME_DEFER;
2379 }
2380
2381 spin_unlock(&x->lock);
2382 }
2383
2384 static LIST_HEAD(xfrm_km_list);
2385
km_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2386 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2387 {
2388 struct xfrm_mgr *km;
2389
2390 rcu_read_lock();
2391 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2392 if (km->notify_policy)
2393 km->notify_policy(xp, dir, c);
2394 rcu_read_unlock();
2395 }
2396
km_state_notify(struct xfrm_state * x,const struct km_event * c)2397 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2398 {
2399 struct xfrm_mgr *km;
2400 rcu_read_lock();
2401 list_for_each_entry_rcu(km, &xfrm_km_list, list)
2402 if (km->notify)
2403 km->notify(x, c);
2404 rcu_read_unlock();
2405 }
2406
2407 EXPORT_SYMBOL(km_policy_notify);
2408 EXPORT_SYMBOL(km_state_notify);
2409
km_state_expired(struct xfrm_state * x,int hard,u32 portid)2410 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2411 {
2412 struct km_event c;
2413
2414 c.data.hard = hard;
2415 c.portid = portid;
2416 c.event = XFRM_MSG_EXPIRE;
2417 km_state_notify(x, &c);
2418 }
2419
2420 EXPORT_SYMBOL(km_state_expired);
2421 /*
2422 * We send to all registered managers regardless of failure
2423 * We are happy with one success
2424 */
km_query(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * pol)2425 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2426 {
2427 int err = -EINVAL, acqret;
2428 struct xfrm_mgr *km;
2429
2430 rcu_read_lock();
2431 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2432 acqret = km->acquire(x, t, pol);
2433 if (!acqret)
2434 err = acqret;
2435 }
2436 rcu_read_unlock();
2437 return err;
2438 }
2439 EXPORT_SYMBOL(km_query);
2440
__km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2441 static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2442 {
2443 int err = -EINVAL;
2444 struct xfrm_mgr *km;
2445
2446 rcu_read_lock();
2447 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2448 if (km->new_mapping)
2449 err = km->new_mapping(x, ipaddr, sport);
2450 if (!err)
2451 break;
2452 }
2453 rcu_read_unlock();
2454 return err;
2455 }
2456
km_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)2457 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2458 {
2459 int ret = 0;
2460
2461 if (x->mapping_maxage) {
2462 if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
2463 x->new_mapping_sport != sport) {
2464 x->new_mapping_sport = sport;
2465 x->new_mapping = jiffies / HZ;
2466 ret = __km_new_mapping(x, ipaddr, sport);
2467 }
2468 } else {
2469 ret = __km_new_mapping(x, ipaddr, sport);
2470 }
2471
2472 return ret;
2473 }
2474 EXPORT_SYMBOL(km_new_mapping);
2475
km_policy_expired(struct xfrm_policy * pol,int dir,int hard,u32 portid)2476 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2477 {
2478 struct km_event c;
2479
2480 c.data.hard = hard;
2481 c.portid = portid;
2482 c.event = XFRM_MSG_POLEXPIRE;
2483 km_policy_notify(pol, dir, &c);
2484 }
2485 EXPORT_SYMBOL(km_policy_expired);
2486
2487 #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)2488 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2489 const struct xfrm_migrate *m, int num_migrate,
2490 const struct xfrm_kmaddress *k,
2491 const struct xfrm_encap_tmpl *encap)
2492 {
2493 int err = -EINVAL;
2494 int ret;
2495 struct xfrm_mgr *km;
2496
2497 rcu_read_lock();
2498 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2499 if (km->migrate) {
2500 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2501 encap);
2502 if (!ret)
2503 err = ret;
2504 }
2505 }
2506 rcu_read_unlock();
2507 return err;
2508 }
2509 EXPORT_SYMBOL(km_migrate);
2510 #endif
2511
km_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)2512 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2513 {
2514 int err = -EINVAL;
2515 int ret;
2516 struct xfrm_mgr *km;
2517
2518 rcu_read_lock();
2519 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2520 if (km->report) {
2521 ret = km->report(net, proto, sel, addr);
2522 if (!ret)
2523 err = ret;
2524 }
2525 }
2526 rcu_read_unlock();
2527 return err;
2528 }
2529 EXPORT_SYMBOL(km_report);
2530
km_is_alive(const struct km_event * c)2531 static bool km_is_alive(const struct km_event *c)
2532 {
2533 struct xfrm_mgr *km;
2534 bool is_alive = false;
2535
2536 rcu_read_lock();
2537 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2538 if (km->is_alive && km->is_alive(c)) {
2539 is_alive = true;
2540 break;
2541 }
2542 }
2543 rcu_read_unlock();
2544
2545 return is_alive;
2546 }
2547
2548 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2549 static DEFINE_SPINLOCK(xfrm_translator_lock);
2550 static struct xfrm_translator __rcu *xfrm_translator;
2551
xfrm_get_translator(void)2552 struct xfrm_translator *xfrm_get_translator(void)
2553 {
2554 struct xfrm_translator *xtr;
2555
2556 rcu_read_lock();
2557 xtr = rcu_dereference(xfrm_translator);
2558 if (unlikely(!xtr))
2559 goto out;
2560 if (!try_module_get(xtr->owner))
2561 xtr = NULL;
2562 out:
2563 rcu_read_unlock();
2564 return xtr;
2565 }
2566 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2567
xfrm_put_translator(struct xfrm_translator * xtr)2568 void xfrm_put_translator(struct xfrm_translator *xtr)
2569 {
2570 module_put(xtr->owner);
2571 }
2572 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2573
xfrm_register_translator(struct xfrm_translator * xtr)2574 int xfrm_register_translator(struct xfrm_translator *xtr)
2575 {
2576 int err = 0;
2577
2578 spin_lock_bh(&xfrm_translator_lock);
2579 if (unlikely(xfrm_translator != NULL))
2580 err = -EEXIST;
2581 else
2582 rcu_assign_pointer(xfrm_translator, xtr);
2583 spin_unlock_bh(&xfrm_translator_lock);
2584
2585 return err;
2586 }
2587 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2588
xfrm_unregister_translator(struct xfrm_translator * xtr)2589 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2590 {
2591 int err = 0;
2592
2593 spin_lock_bh(&xfrm_translator_lock);
2594 if (likely(xfrm_translator != NULL)) {
2595 if (rcu_access_pointer(xfrm_translator) != xtr)
2596 err = -EINVAL;
2597 else
2598 RCU_INIT_POINTER(xfrm_translator, NULL);
2599 }
2600 spin_unlock_bh(&xfrm_translator_lock);
2601 synchronize_rcu();
2602
2603 return err;
2604 }
2605 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2606 #endif
2607
xfrm_user_policy(struct sock * sk,int optname,sockptr_t optval,int optlen)2608 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2609 {
2610 int err;
2611 u8 *data;
2612 struct xfrm_mgr *km;
2613 struct xfrm_policy *pol = NULL;
2614
2615 if (sockptr_is_null(optval) && !optlen) {
2616 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2617 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2618 __sk_dst_reset(sk);
2619 return 0;
2620 }
2621
2622 if (optlen <= 0 || optlen > PAGE_SIZE)
2623 return -EMSGSIZE;
2624
2625 data = memdup_sockptr(optval, optlen);
2626 if (IS_ERR(data))
2627 return PTR_ERR(data);
2628
2629 if (in_compat_syscall()) {
2630 struct xfrm_translator *xtr = xfrm_get_translator();
2631
2632 if (!xtr) {
2633 kfree(data);
2634 return -EOPNOTSUPP;
2635 }
2636
2637 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2638 xfrm_put_translator(xtr);
2639 if (err) {
2640 kfree(data);
2641 return err;
2642 }
2643 }
2644
2645 err = -EINVAL;
2646 rcu_read_lock();
2647 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2648 pol = km->compile_policy(sk, optname, data,
2649 optlen, &err);
2650 if (err >= 0)
2651 break;
2652 }
2653 rcu_read_unlock();
2654
2655 if (err >= 0) {
2656 xfrm_sk_policy_insert(sk, err, pol);
2657 xfrm_pol_put(pol);
2658 __sk_dst_reset(sk);
2659 err = 0;
2660 }
2661
2662 kfree(data);
2663 return err;
2664 }
2665 EXPORT_SYMBOL(xfrm_user_policy);
2666
2667 static DEFINE_SPINLOCK(xfrm_km_lock);
2668
xfrm_register_km(struct xfrm_mgr * km)2669 void xfrm_register_km(struct xfrm_mgr *km)
2670 {
2671 spin_lock_bh(&xfrm_km_lock);
2672 list_add_tail_rcu(&km->list, &xfrm_km_list);
2673 spin_unlock_bh(&xfrm_km_lock);
2674 }
2675 EXPORT_SYMBOL(xfrm_register_km);
2676
xfrm_unregister_km(struct xfrm_mgr * km)2677 void xfrm_unregister_km(struct xfrm_mgr *km)
2678 {
2679 spin_lock_bh(&xfrm_km_lock);
2680 list_del_rcu(&km->list);
2681 spin_unlock_bh(&xfrm_km_lock);
2682 synchronize_rcu();
2683 }
2684 EXPORT_SYMBOL(xfrm_unregister_km);
2685
xfrm_state_register_afinfo(struct xfrm_state_afinfo * afinfo)2686 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2687 {
2688 int err = 0;
2689
2690 if (WARN_ON(afinfo->family >= NPROTO))
2691 return -EAFNOSUPPORT;
2692
2693 spin_lock_bh(&xfrm_state_afinfo_lock);
2694 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2695 err = -EEXIST;
2696 else
2697 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2698 spin_unlock_bh(&xfrm_state_afinfo_lock);
2699 return err;
2700 }
2701 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2702
xfrm_state_unregister_afinfo(struct xfrm_state_afinfo * afinfo)2703 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2704 {
2705 int err = 0, family = afinfo->family;
2706
2707 if (WARN_ON(family >= NPROTO))
2708 return -EAFNOSUPPORT;
2709
2710 spin_lock_bh(&xfrm_state_afinfo_lock);
2711 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2712 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2713 err = -EINVAL;
2714 else
2715 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2716 }
2717 spin_unlock_bh(&xfrm_state_afinfo_lock);
2718 synchronize_rcu();
2719 return err;
2720 }
2721 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2722
xfrm_state_afinfo_get_rcu(unsigned int family)2723 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2724 {
2725 if (unlikely(family >= NPROTO))
2726 return NULL;
2727
2728 return rcu_dereference(xfrm_state_afinfo[family]);
2729 }
2730 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2731
xfrm_state_get_afinfo(unsigned int family)2732 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2733 {
2734 struct xfrm_state_afinfo *afinfo;
2735 if (unlikely(family >= NPROTO))
2736 return NULL;
2737 rcu_read_lock();
2738 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2739 if (unlikely(!afinfo))
2740 rcu_read_unlock();
2741 return afinfo;
2742 }
2743
xfrm_flush_gc(void)2744 void xfrm_flush_gc(void)
2745 {
2746 flush_work(&xfrm_state_gc_work);
2747 }
2748 EXPORT_SYMBOL(xfrm_flush_gc);
2749
2750 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
xfrm_state_delete_tunnel(struct xfrm_state * x)2751 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2752 {
2753 if (x->tunnel) {
2754 struct xfrm_state *t = x->tunnel;
2755
2756 if (atomic_read(&t->tunnel_users) == 2)
2757 xfrm_state_delete(t);
2758 atomic_dec(&t->tunnel_users);
2759 xfrm_state_put_sync(t);
2760 x->tunnel = NULL;
2761 }
2762 }
2763 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2764
xfrm_state_mtu(struct xfrm_state * x,int mtu)2765 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2766 {
2767 const struct xfrm_type *type = READ_ONCE(x->type);
2768 struct crypto_aead *aead;
2769 u32 blksize, net_adj = 0;
2770
2771 if (x->km.state != XFRM_STATE_VALID ||
2772 !type || type->proto != IPPROTO_ESP)
2773 return mtu - x->props.header_len;
2774
2775 aead = x->data;
2776 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2777
2778 switch (x->props.mode) {
2779 case XFRM_MODE_TRANSPORT:
2780 case XFRM_MODE_BEET:
2781 if (x->props.family == AF_INET)
2782 net_adj = sizeof(struct iphdr);
2783 else if (x->props.family == AF_INET6)
2784 net_adj = sizeof(struct ipv6hdr);
2785 break;
2786 case XFRM_MODE_TUNNEL:
2787 break;
2788 default:
2789 WARN_ON_ONCE(1);
2790 break;
2791 }
2792
2793 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2794 net_adj) & ~(blksize - 1)) + net_adj - 2;
2795 }
2796 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2797
__xfrm_init_state(struct xfrm_state * x,bool init_replay,bool offload,struct netlink_ext_ack * extack)2798 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload,
2799 struct netlink_ext_ack *extack)
2800 {
2801 const struct xfrm_mode *inner_mode;
2802 const struct xfrm_mode *outer_mode;
2803 int family = x->props.family;
2804 int err;
2805
2806 if (family == AF_INET &&
2807 READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc))
2808 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2809
2810 err = -EPROTONOSUPPORT;
2811
2812 if (x->sel.family != AF_UNSPEC) {
2813 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2814 if (inner_mode == NULL) {
2815 NL_SET_ERR_MSG(extack, "Requested mode not found");
2816 goto error;
2817 }
2818
2819 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2820 family != x->sel.family) {
2821 NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family");
2822 goto error;
2823 }
2824
2825 x->inner_mode = *inner_mode;
2826 } else {
2827 const struct xfrm_mode *inner_mode_iaf;
2828 int iafamily = AF_INET;
2829
2830 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2831 if (inner_mode == NULL) {
2832 NL_SET_ERR_MSG(extack, "Requested mode not found");
2833 goto error;
2834 }
2835
2836 x->inner_mode = *inner_mode;
2837
2838 if (x->props.family == AF_INET)
2839 iafamily = AF_INET6;
2840
2841 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2842 if (inner_mode_iaf) {
2843 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2844 x->inner_mode_iaf = *inner_mode_iaf;
2845 }
2846 }
2847
2848 x->type = xfrm_get_type(x->id.proto, family);
2849 if (x->type == NULL) {
2850 NL_SET_ERR_MSG(extack, "Requested type not found");
2851 goto error;
2852 }
2853
2854 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2855
2856 err = x->type->init_state(x, extack);
2857 if (err)
2858 goto error;
2859
2860 outer_mode = xfrm_get_mode(x->props.mode, family);
2861 if (!outer_mode) {
2862 NL_SET_ERR_MSG(extack, "Requested mode not found");
2863 err = -EPROTONOSUPPORT;
2864 goto error;
2865 }
2866
2867 x->outer_mode = *outer_mode;
2868 if (init_replay) {
2869 err = xfrm_init_replay(x, extack);
2870 if (err)
2871 goto error;
2872 }
2873
2874 error:
2875 return err;
2876 }
2877
2878 EXPORT_SYMBOL(__xfrm_init_state);
2879
xfrm_init_state(struct xfrm_state * x)2880 int xfrm_init_state(struct xfrm_state *x)
2881 {
2882 int err;
2883
2884 err = __xfrm_init_state(x, true, false, NULL);
2885 if (!err)
2886 x->km.state = XFRM_STATE_VALID;
2887
2888 return err;
2889 }
2890
2891 EXPORT_SYMBOL(xfrm_init_state);
2892
xfrm_state_init(struct net * net)2893 int __net_init xfrm_state_init(struct net *net)
2894 {
2895 unsigned int sz;
2896
2897 if (net_eq(net, &init_net))
2898 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2899 SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2900
2901 INIT_LIST_HEAD(&net->xfrm.state_all);
2902
2903 sz = sizeof(struct hlist_head) * 8;
2904
2905 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2906 if (!net->xfrm.state_bydst)
2907 goto out_bydst;
2908 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2909 if (!net->xfrm.state_bysrc)
2910 goto out_bysrc;
2911 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2912 if (!net->xfrm.state_byspi)
2913 goto out_byspi;
2914 net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2915 if (!net->xfrm.state_byseq)
2916 goto out_byseq;
2917 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2918
2919 net->xfrm.state_num = 0;
2920 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2921 spin_lock_init(&net->xfrm.xfrm_state_lock);
2922 seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2923 &net->xfrm.xfrm_state_lock);
2924 return 0;
2925
2926 out_byseq:
2927 xfrm_hash_free(net->xfrm.state_byspi, sz);
2928 out_byspi:
2929 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2930 out_bysrc:
2931 xfrm_hash_free(net->xfrm.state_bydst, sz);
2932 out_bydst:
2933 return -ENOMEM;
2934 }
2935
xfrm_state_fini(struct net * net)2936 void xfrm_state_fini(struct net *net)
2937 {
2938 unsigned int sz;
2939
2940 flush_work(&net->xfrm.state_hash_work);
2941 flush_work(&xfrm_state_gc_work);
2942 xfrm_state_flush(net, 0, false, true);
2943
2944 WARN_ON(!list_empty(&net->xfrm.state_all));
2945
2946 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2947 WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2948 xfrm_hash_free(net->xfrm.state_byseq, sz);
2949 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2950 xfrm_hash_free(net->xfrm.state_byspi, sz);
2951 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2952 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2953 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2954 xfrm_hash_free(net->xfrm.state_bydst, sz);
2955 }
2956
2957 #ifdef CONFIG_AUDITSYSCALL
xfrm_audit_helper_sainfo(struct xfrm_state * x,struct audit_buffer * audit_buf)2958 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2959 struct audit_buffer *audit_buf)
2960 {
2961 struct xfrm_sec_ctx *ctx = x->security;
2962 u32 spi = ntohl(x->id.spi);
2963
2964 if (ctx)
2965 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2966 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2967
2968 switch (x->props.family) {
2969 case AF_INET:
2970 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2971 &x->props.saddr.a4, &x->id.daddr.a4);
2972 break;
2973 case AF_INET6:
2974 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2975 x->props.saddr.a6, x->id.daddr.a6);
2976 break;
2977 }
2978
2979 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2980 }
2981
xfrm_audit_helper_pktinfo(struct sk_buff * skb,u16 family,struct audit_buffer * audit_buf)2982 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2983 struct audit_buffer *audit_buf)
2984 {
2985 const struct iphdr *iph4;
2986 const struct ipv6hdr *iph6;
2987
2988 switch (family) {
2989 case AF_INET:
2990 iph4 = ip_hdr(skb);
2991 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2992 &iph4->saddr, &iph4->daddr);
2993 break;
2994 case AF_INET6:
2995 iph6 = ipv6_hdr(skb);
2996 audit_log_format(audit_buf,
2997 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2998 &iph6->saddr, &iph6->daddr,
2999 iph6->flow_lbl[0] & 0x0f,
3000 iph6->flow_lbl[1],
3001 iph6->flow_lbl[2]);
3002 break;
3003 }
3004 }
3005
xfrm_audit_state_add(struct xfrm_state * x,int result,bool task_valid)3006 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
3007 {
3008 struct audit_buffer *audit_buf;
3009
3010 audit_buf = xfrm_audit_start("SAD-add");
3011 if (audit_buf == NULL)
3012 return;
3013 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3014 xfrm_audit_helper_sainfo(x, audit_buf);
3015 audit_log_format(audit_buf, " res=%u", result);
3016 audit_log_end(audit_buf);
3017 }
3018 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
3019
xfrm_audit_state_delete(struct xfrm_state * x,int result,bool task_valid)3020 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
3021 {
3022 struct audit_buffer *audit_buf;
3023
3024 audit_buf = xfrm_audit_start("SAD-delete");
3025 if (audit_buf == NULL)
3026 return;
3027 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
3028 xfrm_audit_helper_sainfo(x, audit_buf);
3029 audit_log_format(audit_buf, " res=%u", result);
3030 audit_log_end(audit_buf);
3031 }
3032 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
3033
xfrm_audit_state_replay_overflow(struct xfrm_state * x,struct sk_buff * skb)3034 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
3035 struct sk_buff *skb)
3036 {
3037 struct audit_buffer *audit_buf;
3038 u32 spi;
3039
3040 audit_buf = xfrm_audit_start("SA-replay-overflow");
3041 if (audit_buf == NULL)
3042 return;
3043 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3044 /* don't record the sequence number because it's inherent in this kind
3045 * of audit message */
3046 spi = ntohl(x->id.spi);
3047 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
3048 audit_log_end(audit_buf);
3049 }
3050 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
3051
xfrm_audit_state_replay(struct xfrm_state * x,struct sk_buff * skb,__be32 net_seq)3052 void xfrm_audit_state_replay(struct xfrm_state *x,
3053 struct sk_buff *skb, __be32 net_seq)
3054 {
3055 struct audit_buffer *audit_buf;
3056 u32 spi;
3057
3058 audit_buf = xfrm_audit_start("SA-replayed-pkt");
3059 if (audit_buf == NULL)
3060 return;
3061 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3062 spi = ntohl(x->id.spi);
3063 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3064 spi, spi, ntohl(net_seq));
3065 audit_log_end(audit_buf);
3066 }
3067 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
3068
xfrm_audit_state_notfound_simple(struct sk_buff * skb,u16 family)3069 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
3070 {
3071 struct audit_buffer *audit_buf;
3072
3073 audit_buf = xfrm_audit_start("SA-notfound");
3074 if (audit_buf == NULL)
3075 return;
3076 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3077 audit_log_end(audit_buf);
3078 }
3079 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
3080
xfrm_audit_state_notfound(struct sk_buff * skb,u16 family,__be32 net_spi,__be32 net_seq)3081 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
3082 __be32 net_spi, __be32 net_seq)
3083 {
3084 struct audit_buffer *audit_buf;
3085 u32 spi;
3086
3087 audit_buf = xfrm_audit_start("SA-notfound");
3088 if (audit_buf == NULL)
3089 return;
3090 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
3091 spi = ntohl(net_spi);
3092 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3093 spi, spi, ntohl(net_seq));
3094 audit_log_end(audit_buf);
3095 }
3096 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
3097
xfrm_audit_state_icvfail(struct xfrm_state * x,struct sk_buff * skb,u8 proto)3098 void xfrm_audit_state_icvfail(struct xfrm_state *x,
3099 struct sk_buff *skb, u8 proto)
3100 {
3101 struct audit_buffer *audit_buf;
3102 __be32 net_spi;
3103 __be32 net_seq;
3104
3105 audit_buf = xfrm_audit_start("SA-icv-failure");
3106 if (audit_buf == NULL)
3107 return;
3108 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
3109 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
3110 u32 spi = ntohl(net_spi);
3111 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
3112 spi, spi, ntohl(net_seq));
3113 }
3114 audit_log_end(audit_buf);
3115 }
3116 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
3117 #endif /* CONFIG_AUDITSYSCALL */
3118