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14#include <linux/crypto.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/socket.h>
20#include <linux/string.h>
21#include <linux/net.h>
22#include <linux/skbuff.h>
23#include <linux/pfkeyv2.h>
24#include <linux/ipsec.h>
25#include <linux/init.h>
26#include <linux/security.h>
27#include <net/sock.h>
28#include <net/xfrm.h>
29#include <net/netlink.h>
30#include <net/ah.h>
31#include <linux/uaccess.h>
32#if IS_ENABLED(CONFIG_IPV6)
33#include <linux/in6.h>
34#endif
35#include <asm/unaligned.h>
36
37static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38{
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61}
62
63static int verify_auth_trunc(struct nlattr **attrs)
64{
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77}
78
79static int verify_aead(struct nlattr **attrs)
80{
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93}
94
95static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97{
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102}
103
104static inline int verify_sec_ctx_len(struct nlattr **attrs)
105{
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118}
119
120static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122{
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146}
147
148static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150{
151 int err;
152
153 err = -EINVAL;
154 switch (p->family) {
155 case AF_INET:
156 break;
157
158 case AF_INET6:
159#if IS_ENABLED(CONFIG_IPV6)
160 break;
161#else
162 err = -EAFNOSUPPORT;
163 goto out;
164#endif
165
166 default:
167 goto out;
168 }
169
170 switch (p->sel.family) {
171 case AF_UNSPEC:
172 break;
173
174 case AF_INET:
175 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
176 goto out;
177
178 break;
179
180 case AF_INET6:
181#if IS_ENABLED(CONFIG_IPV6)
182 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
183 goto out;
184
185 break;
186#else
187 err = -EAFNOSUPPORT;
188 goto out;
189#endif
190
191 default:
192 goto out;
193 }
194
195 err = -EINVAL;
196 switch (p->id.proto) {
197 case IPPROTO_AH:
198 if ((!attrs[XFRMA_ALG_AUTH] &&
199 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_CRYPT] ||
202 attrs[XFRMA_ALG_COMP] ||
203 attrs[XFRMA_TFCPAD])
204 goto out;
205 break;
206
207 case IPPROTO_ESP:
208 if (attrs[XFRMA_ALG_COMP])
209 goto out;
210 if (!attrs[XFRMA_ALG_AUTH] &&
211 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
212 !attrs[XFRMA_ALG_CRYPT] &&
213 !attrs[XFRMA_ALG_AEAD])
214 goto out;
215 if ((attrs[XFRMA_ALG_AUTH] ||
216 attrs[XFRMA_ALG_AUTH_TRUNC] ||
217 attrs[XFRMA_ALG_CRYPT]) &&
218 attrs[XFRMA_ALG_AEAD])
219 goto out;
220 if (attrs[XFRMA_TFCPAD] &&
221 p->mode != XFRM_MODE_TUNNEL)
222 goto out;
223 break;
224
225 case IPPROTO_COMP:
226 if (!attrs[XFRMA_ALG_COMP] ||
227 attrs[XFRMA_ALG_AEAD] ||
228 attrs[XFRMA_ALG_AUTH] ||
229 attrs[XFRMA_ALG_AUTH_TRUNC] ||
230 attrs[XFRMA_ALG_CRYPT] ||
231 attrs[XFRMA_TFCPAD] ||
232 (ntohl(p->id.spi) >= 0x10000))
233 goto out;
234 break;
235
236#if IS_ENABLED(CONFIG_IPV6)
237 case IPPROTO_DSTOPTS:
238 case IPPROTO_ROUTING:
239 if (attrs[XFRMA_ALG_COMP] ||
240 attrs[XFRMA_ALG_AUTH] ||
241 attrs[XFRMA_ALG_AUTH_TRUNC] ||
242 attrs[XFRMA_ALG_AEAD] ||
243 attrs[XFRMA_ALG_CRYPT] ||
244 attrs[XFRMA_ENCAP] ||
245 attrs[XFRMA_SEC_CTX] ||
246 attrs[XFRMA_TFCPAD] ||
247 !attrs[XFRMA_COADDR])
248 goto out;
249 break;
250#endif
251
252 default:
253 goto out;
254 }
255
256 if ((err = verify_aead(attrs)))
257 goto out;
258 if ((err = verify_auth_trunc(attrs)))
259 goto out;
260 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
261 goto out;
262 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
265 goto out;
266 if ((err = verify_sec_ctx_len(attrs)))
267 goto out;
268 if ((err = verify_replay(p, attrs)))
269 goto out;
270
271 err = -EINVAL;
272 switch (p->mode) {
273 case XFRM_MODE_TRANSPORT:
274 case XFRM_MODE_TUNNEL:
275 case XFRM_MODE_ROUTEOPTIMIZATION:
276 case XFRM_MODE_BEET:
277 break;
278
279 default:
280 goto out;
281 }
282
283 err = 0;
284
285out:
286 return err;
287}
288
289static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
290 struct xfrm_algo_desc *(*get_byname)(const char *, int),
291 struct nlattr *rta)
292{
293 struct xfrm_algo *p, *ualg;
294 struct xfrm_algo_desc *algo;
295
296 if (!rta)
297 return 0;
298
299 ualg = nla_data(rta);
300
301 algo = get_byname(ualg->alg_name, 1);
302 if (!algo)
303 return -ENOSYS;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 *algpp = p;
312 return 0;
313}
314
315static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
316{
317 struct xfrm_algo *p, *ualg;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 x->props.ealgo = algo->desc.sadb_alg_id;
329
330 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 x->ealg = p;
336 x->geniv = algo->uinfo.encr.geniv;
337 return 0;
338}
339
340static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
341 struct nlattr *rta)
342{
343 struct xfrm_algo *ualg;
344 struct xfrm_algo_auth *p;
345 struct xfrm_algo_desc *algo;
346
347 if (!rta)
348 return 0;
349
350 ualg = nla_data(rta);
351
352 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
353 if (!algo)
354 return -ENOSYS;
355 *props = algo->desc.sadb_alg_id;
356
357 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
358 if (!p)
359 return -ENOMEM;
360
361 strcpy(p->alg_name, algo->name);
362 p->alg_key_len = ualg->alg_key_len;
363 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
364 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
365
366 *algpp = p;
367 return 0;
368}
369
370static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
371 struct nlattr *rta)
372{
373 struct xfrm_algo_auth *p, *ualg;
374 struct xfrm_algo_desc *algo;
375
376 if (!rta)
377 return 0;
378
379 ualg = nla_data(rta);
380
381 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
382 if (!algo)
383 return -ENOSYS;
384 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
385 return -EINVAL;
386 *props = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 if (!p->alg_trunc_len)
394 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
395
396 *algpp = p;
397 return 0;
398}
399
400static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
401{
402 struct xfrm_algo_aead *p, *ualg;
403 struct xfrm_algo_desc *algo;
404
405 if (!rta)
406 return 0;
407
408 ualg = nla_data(rta);
409
410 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
411 if (!algo)
412 return -ENOSYS;
413 x->props.ealgo = algo->desc.sadb_alg_id;
414
415 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 strcpy(p->alg_name, algo->name);
420 x->aead = p;
421 x->geniv = algo->uinfo.aead.geniv;
422 return 0;
423}
424
425static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
426 struct nlattr *rp)
427{
428 struct xfrm_replay_state_esn *up;
429 unsigned int ulen;
430
431 if (!replay_esn || !rp)
432 return 0;
433
434 up = nla_data(rp);
435 ulen = xfrm_replay_state_esn_len(up);
436
437
438
439 if (nla_len(rp) < (int)ulen ||
440 xfrm_replay_state_esn_len(replay_esn) != ulen ||
441 replay_esn->bmp_len != up->bmp_len)
442 return -EINVAL;
443
444 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
445 return -EINVAL;
446
447 return 0;
448}
449
450static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
451 struct xfrm_replay_state_esn **preplay_esn,
452 struct nlattr *rta)
453{
454 struct xfrm_replay_state_esn *p, *pp, *up;
455 unsigned int klen, ulen;
456
457 if (!rta)
458 return 0;
459
460 up = nla_data(rta);
461 klen = xfrm_replay_state_esn_len(up);
462 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
463
464 p = kzalloc(klen, GFP_KERNEL);
465 if (!p)
466 return -ENOMEM;
467
468 pp = kzalloc(klen, GFP_KERNEL);
469 if (!pp) {
470 kfree(p);
471 return -ENOMEM;
472 }
473
474 memcpy(p, up, ulen);
475 memcpy(pp, up, ulen);
476
477 *replay_esn = p;
478 *preplay_esn = pp;
479
480 return 0;
481}
482
483static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
484{
485 unsigned int len = 0;
486
487 if (xfrm_ctx) {
488 len += sizeof(struct xfrm_user_sec_ctx);
489 len += xfrm_ctx->ctx_len;
490 }
491 return len;
492}
493
494static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
495{
496 memcpy(&x->id, &p->id, sizeof(x->id));
497 memcpy(&x->sel, &p->sel, sizeof(x->sel));
498 memcpy(&x->lft, &p->lft, sizeof(x->lft));
499 x->props.mode = p->mode;
500 x->props.replay_window = min_t(unsigned int, p->replay_window,
501 sizeof(x->replay.bitmap) * 8);
502 x->props.reqid = p->reqid;
503 x->props.family = p->family;
504 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
505 x->props.flags = p->flags;
506
507 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
508 x->sel.family = p->family;
509}
510
511
512
513
514
515
516static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
517 int update_esn)
518{
519 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
520 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
521 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
522 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
523 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
524
525 if (re) {
526 struct xfrm_replay_state_esn *replay_esn;
527 replay_esn = nla_data(re);
528 memcpy(x->replay_esn, replay_esn,
529 xfrm_replay_state_esn_len(replay_esn));
530 memcpy(x->preplay_esn, replay_esn,
531 xfrm_replay_state_esn_len(replay_esn));
532 }
533
534 if (rp) {
535 struct xfrm_replay_state *replay;
536 replay = nla_data(rp);
537 memcpy(&x->replay, replay, sizeof(*replay));
538 memcpy(&x->preplay, replay, sizeof(*replay));
539 }
540
541 if (lt) {
542 struct xfrm_lifetime_cur *ltime;
543 ltime = nla_data(lt);
544 x->curlft.bytes = ltime->bytes;
545 x->curlft.packets = ltime->packets;
546 x->curlft.add_time = ltime->add_time;
547 x->curlft.use_time = ltime->use_time;
548 }
549
550 if (et)
551 x->replay_maxage = nla_get_u32(et);
552
553 if (rt)
554 x->replay_maxdiff = nla_get_u32(rt);
555}
556
557static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
558{
559 if (attrs[XFRMA_SET_MARK]) {
560 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
561 if (attrs[XFRMA_SET_MARK_MASK])
562 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
563 else
564 m->m = 0xffffffff;
565 } else {
566 m->v = m->m = 0;
567 }
568}
569
570static struct xfrm_state *xfrm_state_construct(struct net *net,
571 struct xfrm_usersa_info *p,
572 struct nlattr **attrs,
573 int *errp)
574{
575 struct xfrm_state *x = xfrm_state_alloc(net);
576 int err = -ENOMEM;
577
578 if (!x)
579 goto error_no_put;
580
581 copy_from_user_state(x, p);
582
583 if (attrs[XFRMA_ENCAP]) {
584 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
585 sizeof(*x->encap), GFP_KERNEL);
586 if (x->encap == NULL)
587 goto error;
588 }
589
590 if (attrs[XFRMA_COADDR]) {
591 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
592 sizeof(*x->coaddr), GFP_KERNEL);
593 if (x->coaddr == NULL)
594 goto error;
595 }
596
597 if (attrs[XFRMA_SA_EXTRA_FLAGS])
598 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
599
600 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
601 goto error;
602 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
603 attrs[XFRMA_ALG_AUTH_TRUNC])))
604 goto error;
605 if (!x->props.aalgo) {
606 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
607 attrs[XFRMA_ALG_AUTH])))
608 goto error;
609 }
610 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
611 goto error;
612 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
613 xfrm_calg_get_byname,
614 attrs[XFRMA_ALG_COMP])))
615 goto error;
616
617 if (attrs[XFRMA_TFCPAD])
618 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
619
620 xfrm_mark_get(attrs, &x->mark);
621
622 xfrm_smark_init(attrs, &x->props.smark);
623
624 if (attrs[XFRMA_IF_ID])
625 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
626
627 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
628 if (err)
629 goto error;
630
631 if (attrs[XFRMA_SEC_CTX]) {
632 err = security_xfrm_state_alloc(x,
633 nla_data(attrs[XFRMA_SEC_CTX]));
634 if (err)
635 goto error;
636 }
637
638 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
639 attrs[XFRMA_REPLAY_ESN_VAL])))
640 goto error;
641
642 x->km.seq = p->seq;
643 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
644
645 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
646
647 if ((err = xfrm_init_replay(x)))
648 goto error;
649
650
651 xfrm_update_ae_params(x, attrs, 0);
652
653
654 if (attrs[XFRMA_OFFLOAD_DEV]) {
655 err = xfrm_dev_state_add(net, x,
656 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
657 if (err)
658 goto error;
659 }
660
661 return x;
662
663error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666error_no_put:
667 *errp = err;
668 return NULL;
669}
670
671static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673{
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_usersa_info *p = nlmsg_data(nlh);
676 struct xfrm_state *x;
677 int err;
678 struct km_event c;
679
680 err = verify_newsa_info(p, attrs);
681 if (err)
682 return err;
683
684 x = xfrm_state_construct(net, p, attrs, &err);
685 if (!x)
686 return err;
687
688 xfrm_state_hold(x);
689 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
690 err = xfrm_state_add(x);
691 else
692 err = xfrm_state_update(x);
693
694 xfrm_audit_state_add(x, err ? 0 : 1, true);
695
696 if (err < 0) {
697 x->km.state = XFRM_STATE_DEAD;
698 xfrm_dev_state_delete(x);
699 __xfrm_state_put(x);
700 goto out;
701 }
702
703 if (x->km.state == XFRM_STATE_VOID)
704 x->km.state = XFRM_STATE_VALID;
705
706 c.seq = nlh->nlmsg_seq;
707 c.portid = nlh->nlmsg_pid;
708 c.event = nlh->nlmsg_type;
709
710 km_state_notify(x, &c);
711out:
712 xfrm_state_put(x);
713 return err;
714}
715
716static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
717 struct xfrm_usersa_id *p,
718 struct nlattr **attrs,
719 int *errp)
720{
721 struct xfrm_state *x = NULL;
722 struct xfrm_mark m;
723 int err;
724 u32 mark = xfrm_mark_get(attrs, &m);
725
726 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
727 err = -ESRCH;
728 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
729 } else {
730 xfrm_address_t *saddr = NULL;
731
732 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
733 if (!saddr) {
734 err = -EINVAL;
735 goto out;
736 }
737
738 err = -ESRCH;
739 x = xfrm_state_lookup_byaddr(net, mark,
740 &p->daddr, saddr,
741 p->proto, p->family);
742 }
743
744 out:
745 if (!x && errp)
746 *errp = err;
747 return x;
748}
749
750static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
751 struct nlattr **attrs)
752{
753 struct net *net = sock_net(skb->sk);
754 struct xfrm_state *x;
755 int err = -ESRCH;
756 struct km_event c;
757 struct xfrm_usersa_id *p = nlmsg_data(nlh);
758
759 x = xfrm_user_state_lookup(net, p, attrs, &err);
760 if (x == NULL)
761 return err;
762
763 if ((err = security_xfrm_state_delete(x)) != 0)
764 goto out;
765
766 if (xfrm_state_kern(x)) {
767 err = -EPERM;
768 goto out;
769 }
770
771 err = xfrm_state_delete(x);
772
773 if (err < 0)
774 goto out;
775
776 c.seq = nlh->nlmsg_seq;
777 c.portid = nlh->nlmsg_pid;
778 c.event = nlh->nlmsg_type;
779 km_state_notify(x, &c);
780
781out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785}
786
787static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
788{
789 memset(p, 0, sizeof(*p));
790 memcpy(&p->id, &x->id, sizeof(p->id));
791 memcpy(&p->sel, &x->sel, sizeof(p->sel));
792 memcpy(&p->lft, &x->lft, sizeof(p->lft));
793 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
794 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
795 put_unaligned(x->stats.replay, &p->stats.replay);
796 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
797 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
798 p->mode = x->props.mode;
799 p->replay_window = x->props.replay_window;
800 p->reqid = x->props.reqid;
801 p->family = x->props.family;
802 p->flags = x->props.flags;
803 p->seq = x->km.seq;
804}
805
806struct xfrm_dump_info {
807 struct sk_buff *in_skb;
808 struct sk_buff *out_skb;
809 u32 nlmsg_seq;
810 u16 nlmsg_flags;
811};
812
813static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
814{
815 struct xfrm_user_sec_ctx *uctx;
816 struct nlattr *attr;
817 int ctx_size = sizeof(*uctx) + s->ctx_len;
818
819 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 uctx = nla_data(attr);
824 uctx->exttype = XFRMA_SEC_CTX;
825 uctx->len = ctx_size;
826 uctx->ctx_doi = s->ctx_doi;
827 uctx->ctx_alg = s->ctx_alg;
828 uctx->ctx_len = s->ctx_len;
829 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
830
831 return 0;
832}
833
834static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
835{
836 struct xfrm_user_offload *xuo;
837 struct nlattr *attr;
838
839 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
840 if (attr == NULL)
841 return -EMSGSIZE;
842
843 xuo = nla_data(attr);
844 memset(xuo, 0, sizeof(*xuo));
845 xuo->ifindex = xso->dev->ifindex;
846 xuo->flags = xso->flags;
847
848 return 0;
849}
850
851static bool xfrm_redact(void)
852{
853 return IS_ENABLED(CONFIG_SECURITY) &&
854 security_locked_down(LOCKDOWN_XFRM_SECRET);
855}
856
857static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
858{
859 struct xfrm_algo *algo;
860 struct xfrm_algo_auth *ap;
861 struct nlattr *nla;
862 bool redact_secret = xfrm_redact();
863
864 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
865 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
866 if (!nla)
867 return -EMSGSIZE;
868 algo = nla_data(nla);
869 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
870
871 if (redact_secret && auth->alg_key_len)
872 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
873 else
874 memcpy(algo->alg_key, auth->alg_key,
875 (auth->alg_key_len + 7) / 8);
876 algo->alg_key_len = auth->alg_key_len;
877
878 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
879 if (!nla)
880 return -EMSGSIZE;
881 ap = nla_data(nla);
882 memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
883 if (redact_secret && auth->alg_key_len)
884 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
885 else
886 memcpy(ap->alg_key, auth->alg_key,
887 (auth->alg_key_len + 7) / 8);
888 return 0;
889}
890
891static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
892{
893 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
894 struct xfrm_algo_aead *ap;
895 bool redact_secret = xfrm_redact();
896
897 if (!nla)
898 return -EMSGSIZE;
899
900 ap = nla_data(nla);
901 memcpy(ap, aead, sizeof(*aead));
902
903 if (redact_secret && aead->alg_key_len)
904 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
905 else
906 memcpy(ap->alg_key, aead->alg_key,
907 (aead->alg_key_len + 7) / 8);
908 return 0;
909}
910
911static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
912{
913 struct xfrm_algo *ap;
914 bool redact_secret = xfrm_redact();
915 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
916 xfrm_alg_len(ealg));
917 if (!nla)
918 return -EMSGSIZE;
919
920 ap = nla_data(nla);
921 memcpy(ap, ealg, sizeof(*ealg));
922
923 if (redact_secret && ealg->alg_key_len)
924 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
925 else
926 memcpy(ap->alg_key, ealg->alg_key,
927 (ealg->alg_key_len + 7) / 8);
928
929 return 0;
930}
931
932static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
933{
934 int ret = 0;
935
936 if (m->v | m->m) {
937 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
938 if (!ret)
939 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
940 }
941 return ret;
942}
943
944
945static int copy_to_user_state_extra(struct xfrm_state *x,
946 struct xfrm_usersa_info *p,
947 struct sk_buff *skb)
948{
949 int ret = 0;
950
951 copy_to_user_state(x, p);
952
953 if (x->props.extra_flags) {
954 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
955 x->props.extra_flags);
956 if (ret)
957 goto out;
958 }
959
960 if (x->coaddr) {
961 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
962 if (ret)
963 goto out;
964 }
965 if (x->lastused) {
966 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
967 XFRMA_PAD);
968 if (ret)
969 goto out;
970 }
971 if (x->aead) {
972 ret = copy_to_user_aead(x->aead, skb);
973 if (ret)
974 goto out;
975 }
976 if (x->aalg) {
977 ret = copy_to_user_auth(x->aalg, skb);
978 if (ret)
979 goto out;
980 }
981 if (x->ealg) {
982 ret = copy_to_user_ealg(x->ealg, skb);
983 if (ret)
984 goto out;
985 }
986 if (x->calg) {
987 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
988 if (ret)
989 goto out;
990 }
991 if (x->encap) {
992 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
993 if (ret)
994 goto out;
995 }
996 if (x->tfcpad) {
997 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
998 if (ret)
999 goto out;
1000 }
1001 ret = xfrm_mark_put(skb, &x->mark);
1002 if (ret)
1003 goto out;
1004
1005 ret = xfrm_smark_put(skb, &x->props.smark);
1006 if (ret)
1007 goto out;
1008
1009 if (x->replay_esn)
1010 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1011 xfrm_replay_state_esn_len(x->replay_esn),
1012 x->replay_esn);
1013 else
1014 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1015 &x->replay);
1016 if (ret)
1017 goto out;
1018 if(x->xso.dev)
1019 ret = copy_user_offload(&x->xso, skb);
1020 if (ret)
1021 goto out;
1022 if (x->if_id) {
1023 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1024 if (ret)
1025 goto out;
1026 }
1027 if (x->security)
1028 ret = copy_sec_ctx(x->security, skb);
1029out:
1030 return ret;
1031}
1032
1033static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1034{
1035 struct xfrm_dump_info *sp = ptr;
1036 struct sk_buff *in_skb = sp->in_skb;
1037 struct sk_buff *skb = sp->out_skb;
1038 struct xfrm_translator *xtr;
1039 struct xfrm_usersa_info *p;
1040 struct nlmsghdr *nlh;
1041 int err;
1042
1043 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1044 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1045 if (nlh == NULL)
1046 return -EMSGSIZE;
1047
1048 p = nlmsg_data(nlh);
1049
1050 err = copy_to_user_state_extra(x, p, skb);
1051 if (err) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
1055 nlmsg_end(skb, nlh);
1056
1057 xtr = xfrm_get_translator();
1058 if (xtr) {
1059 err = xtr->alloc_compat(skb, nlh);
1060
1061 xfrm_put_translator(xtr);
1062 if (err) {
1063 nlmsg_cancel(skb, nlh);
1064 return err;
1065 }
1066 }
1067
1068 return 0;
1069}
1070
1071static int xfrm_dump_sa_done(struct netlink_callback *cb)
1072{
1073 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1074 struct sock *sk = cb->skb->sk;
1075 struct net *net = sock_net(sk);
1076
1077 if (cb->args[0])
1078 xfrm_state_walk_done(walk, net);
1079 return 0;
1080}
1081
1082static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1083{
1084 struct net *net = sock_net(skb->sk);
1085 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1086 struct xfrm_dump_info info;
1087
1088 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1089 sizeof(cb->args) - sizeof(cb->args[0]));
1090
1091 info.in_skb = cb->skb;
1092 info.out_skb = skb;
1093 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1094 info.nlmsg_flags = NLM_F_MULTI;
1095
1096 if (!cb->args[0]) {
1097 struct nlattr *attrs[XFRMA_MAX+1];
1098 struct xfrm_address_filter *filter = NULL;
1099 u8 proto = 0;
1100 int err;
1101
1102 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1103 xfrma_policy, cb->extack);
1104 if (err < 0)
1105 return err;
1106
1107 if (attrs[XFRMA_ADDRESS_FILTER]) {
1108 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1109 sizeof(*filter), GFP_KERNEL);
1110 if (filter == NULL)
1111 return -ENOMEM;
1112 }
1113
1114 if (attrs[XFRMA_PROTO])
1115 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1116
1117 xfrm_state_walk_init(walk, proto, filter);
1118 cb->args[0] = 1;
1119 }
1120
1121 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1122
1123 return skb->len;
1124}
1125
1126static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1127 struct xfrm_state *x, u32 seq)
1128{
1129 struct xfrm_dump_info info;
1130 struct sk_buff *skb;
1131 int err;
1132
1133 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1134 if (!skb)
1135 return ERR_PTR(-ENOMEM);
1136
1137 info.in_skb = in_skb;
1138 info.out_skb = skb;
1139 info.nlmsg_seq = seq;
1140 info.nlmsg_flags = 0;
1141
1142 err = dump_one_state(x, 0, &info);
1143 if (err) {
1144 kfree_skb(skb);
1145 return ERR_PTR(err);
1146 }
1147
1148 return skb;
1149}
1150
1151
1152
1153
1154static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1155 u32 pid, unsigned int group)
1156{
1157 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1158 struct xfrm_translator *xtr;
1159
1160 if (!nlsk) {
1161 kfree_skb(skb);
1162 return -EPIPE;
1163 }
1164
1165 xtr = xfrm_get_translator();
1166 if (xtr) {
1167 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1168
1169 xfrm_put_translator(xtr);
1170 if (err) {
1171 kfree_skb(skb);
1172 return err;
1173 }
1174 }
1175
1176 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1177}
1178
1179static inline unsigned int xfrm_spdinfo_msgsize(void)
1180{
1181 return NLMSG_ALIGN(4)
1182 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1183 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1184 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1185 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1186}
1187
1188static int build_spdinfo(struct sk_buff *skb, struct net *net,
1189 u32 portid, u32 seq, u32 flags)
1190{
1191 struct xfrmk_spdinfo si;
1192 struct xfrmu_spdinfo spc;
1193 struct xfrmu_spdhinfo sph;
1194 struct xfrmu_spdhthresh spt4, spt6;
1195 struct nlmsghdr *nlh;
1196 int err;
1197 u32 *f;
1198 unsigned lseq;
1199
1200 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1201 if (nlh == NULL)
1202 return -EMSGSIZE;
1203
1204 f = nlmsg_data(nlh);
1205 *f = flags;
1206 xfrm_spd_getinfo(net, &si);
1207 spc.incnt = si.incnt;
1208 spc.outcnt = si.outcnt;
1209 spc.fwdcnt = si.fwdcnt;
1210 spc.inscnt = si.inscnt;
1211 spc.outscnt = si.outscnt;
1212 spc.fwdscnt = si.fwdscnt;
1213 sph.spdhcnt = si.spdhcnt;
1214 sph.spdhmcnt = si.spdhmcnt;
1215
1216 do {
1217 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1218
1219 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1220 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1221 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1222 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1223 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1224
1225 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1226 if (!err)
1227 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1228 if (!err)
1229 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1230 if (!err)
1231 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1232 if (err) {
1233 nlmsg_cancel(skb, nlh);
1234 return err;
1235 }
1236
1237 nlmsg_end(skb, nlh);
1238 return 0;
1239}
1240
1241static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1242 struct nlattr **attrs)
1243{
1244 struct net *net = sock_net(skb->sk);
1245 struct xfrmu_spdhthresh *thresh4 = NULL;
1246 struct xfrmu_spdhthresh *thresh6 = NULL;
1247
1248
1249 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1250 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1251
1252 if (nla_len(rta) < sizeof(*thresh4))
1253 return -EINVAL;
1254 thresh4 = nla_data(rta);
1255 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1256 return -EINVAL;
1257 }
1258 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1259 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1260
1261 if (nla_len(rta) < sizeof(*thresh6))
1262 return -EINVAL;
1263 thresh6 = nla_data(rta);
1264 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1265 return -EINVAL;
1266 }
1267
1268 if (thresh4 || thresh6) {
1269 write_seqlock(&net->xfrm.policy_hthresh.lock);
1270 if (thresh4) {
1271 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1272 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1273 }
1274 if (thresh6) {
1275 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1276 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1277 }
1278 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1279
1280 xfrm_policy_hash_rebuild(net);
1281 }
1282
1283 return 0;
1284}
1285
1286static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1287 struct nlattr **attrs)
1288{
1289 struct net *net = sock_net(skb->sk);
1290 struct sk_buff *r_skb;
1291 u32 *flags = nlmsg_data(nlh);
1292 u32 sportid = NETLINK_CB(skb).portid;
1293 u32 seq = nlh->nlmsg_seq;
1294 int err;
1295
1296 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1297 if (r_skb == NULL)
1298 return -ENOMEM;
1299
1300 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1301 BUG_ON(err < 0);
1302
1303 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1304}
1305
1306static inline unsigned int xfrm_sadinfo_msgsize(void)
1307{
1308 return NLMSG_ALIGN(4)
1309 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1310 + nla_total_size(4);
1311}
1312
1313static int build_sadinfo(struct sk_buff *skb, struct net *net,
1314 u32 portid, u32 seq, u32 flags)
1315{
1316 struct xfrmk_sadinfo si;
1317 struct xfrmu_sadhinfo sh;
1318 struct nlmsghdr *nlh;
1319 int err;
1320 u32 *f;
1321
1322 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1323 if (nlh == NULL)
1324 return -EMSGSIZE;
1325
1326 f = nlmsg_data(nlh);
1327 *f = flags;
1328 xfrm_sad_getinfo(net, &si);
1329
1330 sh.sadhmcnt = si.sadhmcnt;
1331 sh.sadhcnt = si.sadhcnt;
1332
1333 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1334 if (!err)
1335 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1336 if (err) {
1337 nlmsg_cancel(skb, nlh);
1338 return err;
1339 }
1340
1341 nlmsg_end(skb, nlh);
1342 return 0;
1343}
1344
1345static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1346 struct nlattr **attrs)
1347{
1348 struct net *net = sock_net(skb->sk);
1349 struct sk_buff *r_skb;
1350 u32 *flags = nlmsg_data(nlh);
1351 u32 sportid = NETLINK_CB(skb).portid;
1352 u32 seq = nlh->nlmsg_seq;
1353 int err;
1354
1355 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1356 if (r_skb == NULL)
1357 return -ENOMEM;
1358
1359 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1360 BUG_ON(err < 0);
1361
1362 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1363}
1364
1365static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1366 struct nlattr **attrs)
1367{
1368 struct net *net = sock_net(skb->sk);
1369 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1370 struct xfrm_state *x;
1371 struct sk_buff *resp_skb;
1372 int err = -ESRCH;
1373
1374 x = xfrm_user_state_lookup(net, p, attrs, &err);
1375 if (x == NULL)
1376 goto out_noput;
1377
1378 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1379 if (IS_ERR(resp_skb)) {
1380 err = PTR_ERR(resp_skb);
1381 } else {
1382 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1383 }
1384 xfrm_state_put(x);
1385out_noput:
1386 return err;
1387}
1388
1389static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1390 struct nlattr **attrs)
1391{
1392 struct net *net = sock_net(skb->sk);
1393 struct xfrm_state *x;
1394 struct xfrm_userspi_info *p;
1395 struct xfrm_translator *xtr;
1396 struct sk_buff *resp_skb;
1397 xfrm_address_t *daddr;
1398 int family;
1399 int err;
1400 u32 mark;
1401 struct xfrm_mark m;
1402 u32 if_id = 0;
1403
1404 p = nlmsg_data(nlh);
1405 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1406 if (err)
1407 goto out_noput;
1408
1409 family = p->info.family;
1410 daddr = &p->info.id.daddr;
1411
1412 x = NULL;
1413
1414 mark = xfrm_mark_get(attrs, &m);
1415
1416 if (attrs[XFRMA_IF_ID])
1417 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1418
1419 if (p->info.seq) {
1420 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1421 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1422 xfrm_state_put(x);
1423 x = NULL;
1424 }
1425 }
1426
1427 if (!x)
1428 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1429 if_id, p->info.id.proto, daddr,
1430 &p->info.saddr, 1,
1431 family);
1432 err = -ENOENT;
1433 if (x == NULL)
1434 goto out_noput;
1435
1436 err = xfrm_alloc_spi(x, p->min, p->max);
1437 if (err)
1438 goto out;
1439
1440 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1441 if (IS_ERR(resp_skb)) {
1442 err = PTR_ERR(resp_skb);
1443 goto out;
1444 }
1445
1446 xtr = xfrm_get_translator();
1447 if (xtr) {
1448 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1449
1450 xfrm_put_translator(xtr);
1451 if (err) {
1452 kfree_skb(resp_skb);
1453 goto out;
1454 }
1455 }
1456
1457 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1458
1459out:
1460 xfrm_state_put(x);
1461out_noput:
1462 return err;
1463}
1464
1465static int verify_policy_dir(u8 dir)
1466{
1467 switch (dir) {
1468 case XFRM_POLICY_IN:
1469 case XFRM_POLICY_OUT:
1470 case XFRM_POLICY_FWD:
1471 break;
1472
1473 default:
1474 return -EINVAL;
1475 }
1476
1477 return 0;
1478}
1479
1480static int verify_policy_type(u8 type)
1481{
1482 switch (type) {
1483 case XFRM_POLICY_TYPE_MAIN:
1484#ifdef CONFIG_XFRM_SUB_POLICY
1485 case XFRM_POLICY_TYPE_SUB:
1486#endif
1487 break;
1488
1489 default:
1490 return -EINVAL;
1491 }
1492
1493 return 0;
1494}
1495
1496static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1497{
1498 int ret;
1499
1500 switch (p->share) {
1501 case XFRM_SHARE_ANY:
1502 case XFRM_SHARE_SESSION:
1503 case XFRM_SHARE_USER:
1504 case XFRM_SHARE_UNIQUE:
1505 break;
1506
1507 default:
1508 return -EINVAL;
1509 }
1510
1511 switch (p->action) {
1512 case XFRM_POLICY_ALLOW:
1513 case XFRM_POLICY_BLOCK:
1514 break;
1515
1516 default:
1517 return -EINVAL;
1518 }
1519
1520 switch (p->sel.family) {
1521 case AF_INET:
1522 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1523 return -EINVAL;
1524
1525 break;
1526
1527 case AF_INET6:
1528#if IS_ENABLED(CONFIG_IPV6)
1529 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1530 return -EINVAL;
1531
1532 break;
1533#else
1534 return -EAFNOSUPPORT;
1535#endif
1536
1537 default:
1538 return -EINVAL;
1539 }
1540
1541 ret = verify_policy_dir(p->dir);
1542 if (ret)
1543 return ret;
1544 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1545 return -EINVAL;
1546
1547 return 0;
1548}
1549
1550static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1551{
1552 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1553 struct xfrm_user_sec_ctx *uctx;
1554
1555 if (!rt)
1556 return 0;
1557
1558 uctx = nla_data(rt);
1559 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1560}
1561
1562static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1563 int nr)
1564{
1565 int i;
1566
1567 xp->xfrm_nr = nr;
1568 for (i = 0; i < nr; i++, ut++) {
1569 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1570
1571 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1572 memcpy(&t->saddr, &ut->saddr,
1573 sizeof(xfrm_address_t));
1574 t->reqid = ut->reqid;
1575 t->mode = ut->mode;
1576 t->share = ut->share;
1577 t->optional = ut->optional;
1578 t->aalgos = ut->aalgos;
1579 t->ealgos = ut->ealgos;
1580 t->calgos = ut->calgos;
1581
1582 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1583 t->encap_family = ut->family;
1584 }
1585}
1586
1587static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1588{
1589 u16 prev_family;
1590 int i;
1591
1592 if (nr > XFRM_MAX_DEPTH)
1593 return -EINVAL;
1594
1595 prev_family = family;
1596
1597 for (i = 0; i < nr; i++) {
1598
1599
1600
1601
1602
1603
1604
1605 if (!ut[i].family)
1606 ut[i].family = family;
1607
1608 switch (ut[i].mode) {
1609 case XFRM_MODE_TUNNEL:
1610 case XFRM_MODE_BEET:
1611 break;
1612 default:
1613 if (ut[i].family != prev_family)
1614 return -EINVAL;
1615 break;
1616 }
1617 if (ut[i].mode >= XFRM_MODE_MAX)
1618 return -EINVAL;
1619
1620 prev_family = ut[i].family;
1621
1622 switch (ut[i].family) {
1623 case AF_INET:
1624 break;
1625#if IS_ENABLED(CONFIG_IPV6)
1626 case AF_INET6:
1627 break;
1628#endif
1629 default:
1630 return -EINVAL;
1631 }
1632
1633 if (!xfrm_id_proto_valid(ut[i].id.proto))
1634 return -EINVAL;
1635 }
1636
1637 return 0;
1638}
1639
1640static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1641{
1642 struct nlattr *rt = attrs[XFRMA_TMPL];
1643
1644 if (!rt) {
1645 pol->xfrm_nr = 0;
1646 } else {
1647 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1648 int nr = nla_len(rt) / sizeof(*utmpl);
1649 int err;
1650
1651 err = validate_tmpl(nr, utmpl, pol->family);
1652 if (err)
1653 return err;
1654
1655 copy_templates(pol, utmpl, nr);
1656 }
1657 return 0;
1658}
1659
1660static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1661{
1662 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1663 struct xfrm_userpolicy_type *upt;
1664 u8 type = XFRM_POLICY_TYPE_MAIN;
1665 int err;
1666
1667 if (rt) {
1668 upt = nla_data(rt);
1669 type = upt->type;
1670 }
1671
1672 err = verify_policy_type(type);
1673 if (err)
1674 return err;
1675
1676 *tp = type;
1677 return 0;
1678}
1679
1680static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1681{
1682 xp->priority = p->priority;
1683 xp->index = p->index;
1684 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1685 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1686 xp->action = p->action;
1687 xp->flags = p->flags;
1688 xp->family = p->sel.family;
1689
1690}
1691
1692static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1693{
1694 memset(p, 0, sizeof(*p));
1695 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1696 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1697 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1698 p->priority = xp->priority;
1699 p->index = xp->index;
1700 p->sel.family = xp->family;
1701 p->dir = dir;
1702 p->action = xp->action;
1703 p->flags = xp->flags;
1704 p->share = XFRM_SHARE_ANY;
1705}
1706
1707static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1708{
1709 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1710 int err;
1711
1712 if (!xp) {
1713 *errp = -ENOMEM;
1714 return NULL;
1715 }
1716
1717 copy_from_user_policy(xp, p);
1718
1719 err = copy_from_user_policy_type(&xp->type, attrs);
1720 if (err)
1721 goto error;
1722
1723 if (!(err = copy_from_user_tmpl(xp, attrs)))
1724 err = copy_from_user_sec_ctx(xp, attrs);
1725 if (err)
1726 goto error;
1727
1728 xfrm_mark_get(attrs, &xp->mark);
1729
1730 if (attrs[XFRMA_IF_ID])
1731 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1732
1733 return xp;
1734 error:
1735 *errp = err;
1736 xp->walk.dead = 1;
1737 xfrm_policy_destroy(xp);
1738 return NULL;
1739}
1740
1741static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1742 struct nlattr **attrs)
1743{
1744 struct net *net = sock_net(skb->sk);
1745 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1746 struct xfrm_policy *xp;
1747 struct km_event c;
1748 int err;
1749 int excl;
1750
1751 err = verify_newpolicy_info(p);
1752 if (err)
1753 return err;
1754 err = verify_sec_ctx_len(attrs);
1755 if (err)
1756 return err;
1757
1758 xp = xfrm_policy_construct(net, p, attrs, &err);
1759 if (!xp)
1760 return err;
1761
1762
1763
1764
1765
1766 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1767 err = xfrm_policy_insert(p->dir, xp, excl);
1768 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1769
1770 if (err) {
1771 security_xfrm_policy_free(xp->security);
1772 kfree(xp);
1773 return err;
1774 }
1775
1776 c.event = nlh->nlmsg_type;
1777 c.seq = nlh->nlmsg_seq;
1778 c.portid = nlh->nlmsg_pid;
1779 km_policy_notify(xp, p->dir, &c);
1780
1781 xfrm_pol_put(xp);
1782
1783 return 0;
1784}
1785
1786static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1787{
1788 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1789 int i;
1790
1791 if (xp->xfrm_nr == 0)
1792 return 0;
1793
1794 for (i = 0; i < xp->xfrm_nr; i++) {
1795 struct xfrm_user_tmpl *up = &vec[i];
1796 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1797
1798 memset(up, 0, sizeof(*up));
1799 memcpy(&up->id, &kp->id, sizeof(up->id));
1800 up->family = kp->encap_family;
1801 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1802 up->reqid = kp->reqid;
1803 up->mode = kp->mode;
1804 up->share = kp->share;
1805 up->optional = kp->optional;
1806 up->aalgos = kp->aalgos;
1807 up->ealgos = kp->ealgos;
1808 up->calgos = kp->calgos;
1809 }
1810
1811 return nla_put(skb, XFRMA_TMPL,
1812 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1813}
1814
1815static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1816{
1817 if (x->security) {
1818 return copy_sec_ctx(x->security, skb);
1819 }
1820 return 0;
1821}
1822
1823static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1824{
1825 if (xp->security)
1826 return copy_sec_ctx(xp->security, skb);
1827 return 0;
1828}
1829static inline unsigned int userpolicy_type_attrsize(void)
1830{
1831#ifdef CONFIG_XFRM_SUB_POLICY
1832 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1833#else
1834 return 0;
1835#endif
1836}
1837
1838#ifdef CONFIG_XFRM_SUB_POLICY
1839static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1840{
1841 struct xfrm_userpolicy_type upt;
1842
1843
1844 memset(&upt, 0, sizeof(upt));
1845 upt.type = type;
1846
1847 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1848}
1849
1850#else
1851static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1852{
1853 return 0;
1854}
1855#endif
1856
1857static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1858{
1859 struct xfrm_dump_info *sp = ptr;
1860 struct xfrm_userpolicy_info *p;
1861 struct sk_buff *in_skb = sp->in_skb;
1862 struct sk_buff *skb = sp->out_skb;
1863 struct xfrm_translator *xtr;
1864 struct nlmsghdr *nlh;
1865 int err;
1866
1867 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1868 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1869 if (nlh == NULL)
1870 return -EMSGSIZE;
1871
1872 p = nlmsg_data(nlh);
1873 copy_to_user_policy(xp, p, dir);
1874 err = copy_to_user_tmpl(xp, skb);
1875 if (!err)
1876 err = copy_to_user_sec_ctx(xp, skb);
1877 if (!err)
1878 err = copy_to_user_policy_type(xp->type, skb);
1879 if (!err)
1880 err = xfrm_mark_put(skb, &xp->mark);
1881 if (!err)
1882 err = xfrm_if_id_put(skb, xp->if_id);
1883 if (err) {
1884 nlmsg_cancel(skb, nlh);
1885 return err;
1886 }
1887 nlmsg_end(skb, nlh);
1888
1889 xtr = xfrm_get_translator();
1890 if (xtr) {
1891 err = xtr->alloc_compat(skb, nlh);
1892
1893 xfrm_put_translator(xtr);
1894 if (err) {
1895 nlmsg_cancel(skb, nlh);
1896 return err;
1897 }
1898 }
1899
1900 return 0;
1901}
1902
1903static int xfrm_dump_policy_done(struct netlink_callback *cb)
1904{
1905 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1906 struct net *net = sock_net(cb->skb->sk);
1907
1908 xfrm_policy_walk_done(walk, net);
1909 return 0;
1910}
1911
1912static int xfrm_dump_policy_start(struct netlink_callback *cb)
1913{
1914 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1915
1916 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1917
1918 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1919 return 0;
1920}
1921
1922static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1923{
1924 struct net *net = sock_net(skb->sk);
1925 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1926 struct xfrm_dump_info info;
1927
1928 info.in_skb = cb->skb;
1929 info.out_skb = skb;
1930 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1931 info.nlmsg_flags = NLM_F_MULTI;
1932
1933 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1934
1935 return skb->len;
1936}
1937
1938static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1939 struct xfrm_policy *xp,
1940 int dir, u32 seq)
1941{
1942 struct xfrm_dump_info info;
1943 struct sk_buff *skb;
1944 int err;
1945
1946 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1947 if (!skb)
1948 return ERR_PTR(-ENOMEM);
1949
1950 info.in_skb = in_skb;
1951 info.out_skb = skb;
1952 info.nlmsg_seq = seq;
1953 info.nlmsg_flags = 0;
1954
1955 err = dump_one_policy(xp, dir, 0, &info);
1956 if (err) {
1957 kfree_skb(skb);
1958 return ERR_PTR(err);
1959 }
1960
1961 return skb;
1962}
1963
1964static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1965 struct nlattr **attrs)
1966{
1967 struct net *net = sock_net(skb->sk);
1968 struct xfrm_policy *xp;
1969 struct xfrm_userpolicy_id *p;
1970 u8 type = XFRM_POLICY_TYPE_MAIN;
1971 int err;
1972 struct km_event c;
1973 int delete;
1974 struct xfrm_mark m;
1975 u32 if_id = 0;
1976
1977 p = nlmsg_data(nlh);
1978 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1979
1980 err = copy_from_user_policy_type(&type, attrs);
1981 if (err)
1982 return err;
1983
1984 err = verify_policy_dir(p->dir);
1985 if (err)
1986 return err;
1987
1988 if (attrs[XFRMA_IF_ID])
1989 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1990
1991 xfrm_mark_get(attrs, &m);
1992
1993 if (p->index)
1994 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1995 p->index, delete, &err);
1996 else {
1997 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1998 struct xfrm_sec_ctx *ctx;
1999
2000 err = verify_sec_ctx_len(attrs);
2001 if (err)
2002 return err;
2003
2004 ctx = NULL;
2005 if (rt) {
2006 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2007
2008 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2009 if (err)
2010 return err;
2011 }
2012 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2013 &p->sel, ctx, delete, &err);
2014 security_xfrm_policy_free(ctx);
2015 }
2016 if (xp == NULL)
2017 return -ENOENT;
2018
2019 if (!delete) {
2020 struct sk_buff *resp_skb;
2021
2022 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2023 if (IS_ERR(resp_skb)) {
2024 err = PTR_ERR(resp_skb);
2025 } else {
2026 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2027 NETLINK_CB(skb).portid);
2028 }
2029 } else {
2030 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2031
2032 if (err != 0)
2033 goto out;
2034
2035 c.data.byid = p->index;
2036 c.event = nlh->nlmsg_type;
2037 c.seq = nlh->nlmsg_seq;
2038 c.portid = nlh->nlmsg_pid;
2039 km_policy_notify(xp, p->dir, &c);
2040 }
2041
2042out:
2043 xfrm_pol_put(xp);
2044 return err;
2045}
2046
2047static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2048 struct nlattr **attrs)
2049{
2050 struct net *net = sock_net(skb->sk);
2051 struct km_event c;
2052 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2053 int err;
2054
2055 err = xfrm_state_flush(net, p->proto, true, false);
2056 if (err) {
2057 if (err == -ESRCH)
2058 return 0;
2059 return err;
2060 }
2061 c.data.proto = p->proto;
2062 c.event = nlh->nlmsg_type;
2063 c.seq = nlh->nlmsg_seq;
2064 c.portid = nlh->nlmsg_pid;
2065 c.net = net;
2066 km_state_notify(NULL, &c);
2067
2068 return 0;
2069}
2070
2071static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2072{
2073 unsigned int replay_size = x->replay_esn ?
2074 xfrm_replay_state_esn_len(x->replay_esn) :
2075 sizeof(struct xfrm_replay_state);
2076
2077 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2078 + nla_total_size(replay_size)
2079 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2080 + nla_total_size(sizeof(struct xfrm_mark))
2081 + nla_total_size(4)
2082 + nla_total_size(4);
2083}
2084
2085static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2086{
2087 struct xfrm_aevent_id *id;
2088 struct nlmsghdr *nlh;
2089 int err;
2090
2091 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2092 if (nlh == NULL)
2093 return -EMSGSIZE;
2094
2095 id = nlmsg_data(nlh);
2096 memset(&id->sa_id, 0, sizeof(id->sa_id));
2097 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2098 id->sa_id.spi = x->id.spi;
2099 id->sa_id.family = x->props.family;
2100 id->sa_id.proto = x->id.proto;
2101 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2102 id->reqid = x->props.reqid;
2103 id->flags = c->data.aevent;
2104
2105 if (x->replay_esn) {
2106 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2107 xfrm_replay_state_esn_len(x->replay_esn),
2108 x->replay_esn);
2109 } else {
2110 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2111 &x->replay);
2112 }
2113 if (err)
2114 goto out_cancel;
2115 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2116 XFRMA_PAD);
2117 if (err)
2118 goto out_cancel;
2119
2120 if (id->flags & XFRM_AE_RTHR) {
2121 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2122 if (err)
2123 goto out_cancel;
2124 }
2125 if (id->flags & XFRM_AE_ETHR) {
2126 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2127 x->replay_maxage * 10 / HZ);
2128 if (err)
2129 goto out_cancel;
2130 }
2131 err = xfrm_mark_put(skb, &x->mark);
2132 if (err)
2133 goto out_cancel;
2134
2135 err = xfrm_if_id_put(skb, x->if_id);
2136 if (err)
2137 goto out_cancel;
2138
2139 nlmsg_end(skb, nlh);
2140 return 0;
2141
2142out_cancel:
2143 nlmsg_cancel(skb, nlh);
2144 return err;
2145}
2146
2147static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2148 struct nlattr **attrs)
2149{
2150 struct net *net = sock_net(skb->sk);
2151 struct xfrm_state *x;
2152 struct sk_buff *r_skb;
2153 int err;
2154 struct km_event c;
2155 u32 mark;
2156 struct xfrm_mark m;
2157 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2158 struct xfrm_usersa_id *id = &p->sa_id;
2159
2160 mark = xfrm_mark_get(attrs, &m);
2161
2162 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2163 if (x == NULL)
2164 return -ESRCH;
2165
2166 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2167 if (r_skb == NULL) {
2168 xfrm_state_put(x);
2169 return -ENOMEM;
2170 }
2171
2172
2173
2174
2175
2176
2177 spin_lock_bh(&x->lock);
2178 c.data.aevent = p->flags;
2179 c.seq = nlh->nlmsg_seq;
2180 c.portid = nlh->nlmsg_pid;
2181
2182 err = build_aevent(r_skb, x, &c);
2183 BUG_ON(err < 0);
2184
2185 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2186 spin_unlock_bh(&x->lock);
2187 xfrm_state_put(x);
2188 return err;
2189}
2190
2191static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2192 struct nlattr **attrs)
2193{
2194 struct net *net = sock_net(skb->sk);
2195 struct xfrm_state *x;
2196 struct km_event c;
2197 int err = -EINVAL;
2198 u32 mark = 0;
2199 struct xfrm_mark m;
2200 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2201 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2202 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2203 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2204 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2205 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2206
2207 if (!lt && !rp && !re && !et && !rt)
2208 return err;
2209
2210
2211 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2212 return err;
2213
2214 mark = xfrm_mark_get(attrs, &m);
2215
2216 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2217 if (x == NULL)
2218 return -ESRCH;
2219
2220 if (x->km.state != XFRM_STATE_VALID)
2221 goto out;
2222
2223 err = xfrm_replay_verify_len(x->replay_esn, re);
2224 if (err)
2225 goto out;
2226
2227 spin_lock_bh(&x->lock);
2228 xfrm_update_ae_params(x, attrs, 1);
2229 spin_unlock_bh(&x->lock);
2230
2231 c.event = nlh->nlmsg_type;
2232 c.seq = nlh->nlmsg_seq;
2233 c.portid = nlh->nlmsg_pid;
2234 c.data.aevent = XFRM_AE_CU;
2235 km_state_notify(x, &c);
2236 err = 0;
2237out:
2238 xfrm_state_put(x);
2239 return err;
2240}
2241
2242static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2243 struct nlattr **attrs)
2244{
2245 struct net *net = sock_net(skb->sk);
2246 struct km_event c;
2247 u8 type = XFRM_POLICY_TYPE_MAIN;
2248 int err;
2249
2250 err = copy_from_user_policy_type(&type, attrs);
2251 if (err)
2252 return err;
2253
2254 err = xfrm_policy_flush(net, type, true);
2255 if (err) {
2256 if (err == -ESRCH)
2257 return 0;
2258 return err;
2259 }
2260
2261 c.data.type = type;
2262 c.event = nlh->nlmsg_type;
2263 c.seq = nlh->nlmsg_seq;
2264 c.portid = nlh->nlmsg_pid;
2265 c.net = net;
2266 km_policy_notify(NULL, 0, &c);
2267 return 0;
2268}
2269
2270static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2271 struct nlattr **attrs)
2272{
2273 struct net *net = sock_net(skb->sk);
2274 struct xfrm_policy *xp;
2275 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2276 struct xfrm_userpolicy_info *p = &up->pol;
2277 u8 type = XFRM_POLICY_TYPE_MAIN;
2278 int err = -ENOENT;
2279 struct xfrm_mark m;
2280 u32 if_id = 0;
2281
2282 err = copy_from_user_policy_type(&type, attrs);
2283 if (err)
2284 return err;
2285
2286 err = verify_policy_dir(p->dir);
2287 if (err)
2288 return err;
2289
2290 if (attrs[XFRMA_IF_ID])
2291 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2292
2293 xfrm_mark_get(attrs, &m);
2294
2295 if (p->index)
2296 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2297 0, &err);
2298 else {
2299 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2300 struct xfrm_sec_ctx *ctx;
2301
2302 err = verify_sec_ctx_len(attrs);
2303 if (err)
2304 return err;
2305
2306 ctx = NULL;
2307 if (rt) {
2308 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2309
2310 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2311 if (err)
2312 return err;
2313 }
2314 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2315 &p->sel, ctx, 0, &err);
2316 security_xfrm_policy_free(ctx);
2317 }
2318 if (xp == NULL)
2319 return -ENOENT;
2320
2321 if (unlikely(xp->walk.dead))
2322 goto out;
2323
2324 err = 0;
2325 if (up->hard) {
2326 xfrm_policy_delete(xp, p->dir);
2327 xfrm_audit_policy_delete(xp, 1, true);
2328 }
2329 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2330
2331out:
2332 xfrm_pol_put(xp);
2333 return err;
2334}
2335
2336static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2337 struct nlattr **attrs)
2338{
2339 struct net *net = sock_net(skb->sk);
2340 struct xfrm_state *x;
2341 int err;
2342 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2343 struct xfrm_usersa_info *p = &ue->state;
2344 struct xfrm_mark m;
2345 u32 mark = xfrm_mark_get(attrs, &m);
2346
2347 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2348
2349 err = -ENOENT;
2350 if (x == NULL)
2351 return err;
2352
2353 spin_lock_bh(&x->lock);
2354 err = -EINVAL;
2355 if (x->km.state != XFRM_STATE_VALID)
2356 goto out;
2357 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2358
2359 if (ue->hard) {
2360 __xfrm_state_delete(x);
2361 xfrm_audit_state_delete(x, 1, true);
2362 }
2363 err = 0;
2364out:
2365 spin_unlock_bh(&x->lock);
2366 xfrm_state_put(x);
2367 return err;
2368}
2369
2370static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2371 struct nlattr **attrs)
2372{
2373 struct net *net = sock_net(skb->sk);
2374 struct xfrm_policy *xp;
2375 struct xfrm_user_tmpl *ut;
2376 int i;
2377 struct nlattr *rt = attrs[XFRMA_TMPL];
2378 struct xfrm_mark mark;
2379
2380 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2381 struct xfrm_state *x = xfrm_state_alloc(net);
2382 int err = -ENOMEM;
2383
2384 if (!x)
2385 goto nomem;
2386
2387 xfrm_mark_get(attrs, &mark);
2388
2389 err = verify_newpolicy_info(&ua->policy);
2390 if (err)
2391 goto free_state;
2392 err = verify_sec_ctx_len(attrs);
2393 if (err)
2394 goto free_state;
2395
2396
2397 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2398 if (!xp)
2399 goto free_state;
2400
2401 memcpy(&x->id, &ua->id, sizeof(ua->id));
2402 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2403 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2404 xp->mark.m = x->mark.m = mark.m;
2405 xp->mark.v = x->mark.v = mark.v;
2406 ut = nla_data(rt);
2407
2408 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2409 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2410 memcpy(&x->id, &t->id, sizeof(x->id));
2411 x->props.mode = t->mode;
2412 x->props.reqid = t->reqid;
2413 x->props.family = ut->family;
2414 t->aalgos = ua->aalgos;
2415 t->ealgos = ua->ealgos;
2416 t->calgos = ua->calgos;
2417 err = km_query(x, t, xp);
2418
2419 }
2420
2421 xfrm_state_free(x);
2422 kfree(xp);
2423
2424 return 0;
2425
2426free_state:
2427 xfrm_state_free(x);
2428nomem:
2429 return err;
2430}
2431
2432#ifdef CONFIG_XFRM_MIGRATE
2433static int copy_from_user_migrate(struct xfrm_migrate *ma,
2434 struct xfrm_kmaddress *k,
2435 struct nlattr **attrs, int *num)
2436{
2437 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2438 struct xfrm_user_migrate *um;
2439 int i, num_migrate;
2440
2441 if (k != NULL) {
2442 struct xfrm_user_kmaddress *uk;
2443
2444 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2445 memcpy(&k->local, &uk->local, sizeof(k->local));
2446 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2447 k->family = uk->family;
2448 k->reserved = uk->reserved;
2449 }
2450
2451 um = nla_data(rt);
2452 num_migrate = nla_len(rt) / sizeof(*um);
2453
2454 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2455 return -EINVAL;
2456
2457 for (i = 0; i < num_migrate; i++, um++, ma++) {
2458 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2459 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2460 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2461 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2462
2463 ma->proto = um->proto;
2464 ma->mode = um->mode;
2465 ma->reqid = um->reqid;
2466
2467 ma->old_family = um->old_family;
2468 ma->new_family = um->new_family;
2469 }
2470
2471 *num = i;
2472 return 0;
2473}
2474
2475static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2476 struct nlattr **attrs)
2477{
2478 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2479 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2480 struct xfrm_kmaddress km, *kmp;
2481 u8 type;
2482 int err;
2483 int n = 0;
2484 struct net *net = sock_net(skb->sk);
2485 struct xfrm_encap_tmpl *encap = NULL;
2486
2487 if (attrs[XFRMA_MIGRATE] == NULL)
2488 return -EINVAL;
2489
2490 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2491
2492 err = copy_from_user_policy_type(&type, attrs);
2493 if (err)
2494 return err;
2495
2496 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2497 if (err)
2498 return err;
2499
2500 if (!n)
2501 return 0;
2502
2503 if (attrs[XFRMA_ENCAP]) {
2504 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2505 sizeof(*encap), GFP_KERNEL);
2506 if (!encap)
2507 return -ENOMEM;
2508 }
2509
2510 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2511
2512 kfree(encap);
2513
2514 return err;
2515}
2516#else
2517static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2518 struct nlattr **attrs)
2519{
2520 return -ENOPROTOOPT;
2521}
2522#endif
2523
2524#ifdef CONFIG_XFRM_MIGRATE
2525static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2526{
2527 struct xfrm_user_migrate um;
2528
2529 memset(&um, 0, sizeof(um));
2530 um.proto = m->proto;
2531 um.mode = m->mode;
2532 um.reqid = m->reqid;
2533 um.old_family = m->old_family;
2534 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2535 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2536 um.new_family = m->new_family;
2537 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2538 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2539
2540 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2541}
2542
2543static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2544{
2545 struct xfrm_user_kmaddress uk;
2546
2547 memset(&uk, 0, sizeof(uk));
2548 uk.family = k->family;
2549 uk.reserved = k->reserved;
2550 memcpy(&uk.local, &k->local, sizeof(uk.local));
2551 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2552
2553 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2554}
2555
2556static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2557 int with_encp)
2558{
2559 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2560 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2561 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2562 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2563 + userpolicy_type_attrsize();
2564}
2565
2566static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2567 int num_migrate, const struct xfrm_kmaddress *k,
2568 const struct xfrm_selector *sel,
2569 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2570{
2571 const struct xfrm_migrate *mp;
2572 struct xfrm_userpolicy_id *pol_id;
2573 struct nlmsghdr *nlh;
2574 int i, err;
2575
2576 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2577 if (nlh == NULL)
2578 return -EMSGSIZE;
2579
2580 pol_id = nlmsg_data(nlh);
2581
2582 memset(pol_id, 0, sizeof(*pol_id));
2583 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2584 pol_id->dir = dir;
2585
2586 if (k != NULL) {
2587 err = copy_to_user_kmaddress(k, skb);
2588 if (err)
2589 goto out_cancel;
2590 }
2591 if (encap) {
2592 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2593 if (err)
2594 goto out_cancel;
2595 }
2596 err = copy_to_user_policy_type(type, skb);
2597 if (err)
2598 goto out_cancel;
2599 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2600 err = copy_to_user_migrate(mp, skb);
2601 if (err)
2602 goto out_cancel;
2603 }
2604
2605 nlmsg_end(skb, nlh);
2606 return 0;
2607
2608out_cancel:
2609 nlmsg_cancel(skb, nlh);
2610 return err;
2611}
2612
2613static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2614 const struct xfrm_migrate *m, int num_migrate,
2615 const struct xfrm_kmaddress *k,
2616 const struct xfrm_encap_tmpl *encap)
2617{
2618 struct net *net = &init_net;
2619 struct sk_buff *skb;
2620 int err;
2621
2622 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2623 GFP_ATOMIC);
2624 if (skb == NULL)
2625 return -ENOMEM;
2626
2627
2628 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2629 BUG_ON(err < 0);
2630
2631 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2632}
2633#else
2634static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2635 const struct xfrm_migrate *m, int num_migrate,
2636 const struct xfrm_kmaddress *k,
2637 const struct xfrm_encap_tmpl *encap)
2638{
2639 return -ENOPROTOOPT;
2640}
2641#endif
2642
2643#define XMSGSIZE(type) sizeof(struct type)
2644
2645const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2646 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2647 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2648 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2649 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2650 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2651 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2652 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2653 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2654 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2655 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2656 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2657 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2658 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2659 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2660 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2661 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2662 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2663 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2664 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2665 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2666 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2667};
2668EXPORT_SYMBOL_GPL(xfrm_msg_min);
2669
2670#undef XMSGSIZE
2671
2672const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2673 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2674 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2675 [XFRMA_LASTUSED] = { .type = NLA_U64},
2676 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2677 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2678 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2679 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2680 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2681 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2682 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2683 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2684 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2685 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2686 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2687 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2688 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2689 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2690 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2691 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2692 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2693 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2694 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2695 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2696 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2697 [XFRMA_PROTO] = { .type = NLA_U8 },
2698 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2699 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2700 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2701 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2702 [XFRMA_IF_ID] = { .type = NLA_U32 },
2703};
2704EXPORT_SYMBOL_GPL(xfrma_policy);
2705
2706static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2707 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2708 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2709};
2710
2711static const struct xfrm_link {
2712 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2713 int (*start)(struct netlink_callback *);
2714 int (*dump)(struct sk_buff *, struct netlink_callback *);
2715 int (*done)(struct netlink_callback *);
2716 const struct nla_policy *nla_pol;
2717 int nla_max;
2718} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2719 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2720 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2721 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2722 .dump = xfrm_dump_sa,
2723 .done = xfrm_dump_sa_done },
2724 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2725 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2726 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2727 .start = xfrm_dump_policy_start,
2728 .dump = xfrm_dump_policy,
2729 .done = xfrm_dump_policy_done },
2730 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2731 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2732 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2733 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2734 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2735 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2736 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2737 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2738 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2739 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2740 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2741 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2742 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2743 .nla_pol = xfrma_spd_policy,
2744 .nla_max = XFRMA_SPD_MAX },
2745 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2746};
2747
2748static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2749 struct netlink_ext_ack *extack)
2750{
2751 struct net *net = sock_net(skb->sk);
2752 struct nlattr *attrs[XFRMA_MAX+1];
2753 const struct xfrm_link *link;
2754 struct nlmsghdr *nlh64 = NULL;
2755 int type, err;
2756
2757 type = nlh->nlmsg_type;
2758 if (type > XFRM_MSG_MAX)
2759 return -EINVAL;
2760
2761 type -= XFRM_MSG_BASE;
2762 link = &xfrm_dispatch[type];
2763
2764
2765 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2766 return -EPERM;
2767
2768 if (in_compat_syscall()) {
2769 struct xfrm_translator *xtr = xfrm_get_translator();
2770
2771 if (!xtr)
2772 return -EOPNOTSUPP;
2773
2774 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2775 link->nla_pol, extack);
2776 xfrm_put_translator(xtr);
2777 if (IS_ERR(nlh64))
2778 return PTR_ERR(nlh64);
2779 if (nlh64)
2780 nlh = nlh64;
2781 }
2782
2783 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2784 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2785 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2786 struct netlink_dump_control c = {
2787 .start = link->start,
2788 .dump = link->dump,
2789 .done = link->done,
2790 };
2791
2792 if (link->dump == NULL) {
2793 err = -EINVAL;
2794 goto err;
2795 }
2796
2797 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2798 goto err;
2799 }
2800
2801 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2802 link->nla_max ? : XFRMA_MAX,
2803 link->nla_pol ? : xfrma_policy, extack);
2804 if (err < 0)
2805 goto err;
2806
2807 if (link->doit == NULL) {
2808 err = -EINVAL;
2809 goto err;
2810 }
2811
2812 err = link->doit(skb, nlh, attrs);
2813
2814
2815
2816
2817
2818
2819 if (skb_has_frag_list(skb)) {
2820 kfree_skb(skb_shinfo(skb)->frag_list);
2821 skb_shinfo(skb)->frag_list = NULL;
2822 }
2823
2824err:
2825 kvfree(nlh64);
2826 return err;
2827}
2828
2829static void xfrm_netlink_rcv(struct sk_buff *skb)
2830{
2831 struct net *net = sock_net(skb->sk);
2832
2833 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2834 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2835 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2836}
2837
2838static inline unsigned int xfrm_expire_msgsize(void)
2839{
2840 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2841 + nla_total_size(sizeof(struct xfrm_mark));
2842}
2843
2844static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2845{
2846 struct xfrm_user_expire *ue;
2847 struct nlmsghdr *nlh;
2848 int err;
2849
2850 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2851 if (nlh == NULL)
2852 return -EMSGSIZE;
2853
2854 ue = nlmsg_data(nlh);
2855 copy_to_user_state(x, &ue->state);
2856 ue->hard = (c->data.hard != 0) ? 1 : 0;
2857
2858 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2859
2860 err = xfrm_mark_put(skb, &x->mark);
2861 if (err)
2862 return err;
2863
2864 err = xfrm_if_id_put(skb, x->if_id);
2865 if (err)
2866 return err;
2867
2868 nlmsg_end(skb, nlh);
2869 return 0;
2870}
2871
2872static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2873{
2874 struct net *net = xs_net(x);
2875 struct sk_buff *skb;
2876
2877 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2878 if (skb == NULL)
2879 return -ENOMEM;
2880
2881 if (build_expire(skb, x, c) < 0) {
2882 kfree_skb(skb);
2883 return -EMSGSIZE;
2884 }
2885
2886 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2887}
2888
2889static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2890{
2891 struct net *net = xs_net(x);
2892 struct sk_buff *skb;
2893 int err;
2894
2895 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2896 if (skb == NULL)
2897 return -ENOMEM;
2898
2899 err = build_aevent(skb, x, c);
2900 BUG_ON(err < 0);
2901
2902 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2903}
2904
2905static int xfrm_notify_sa_flush(const struct km_event *c)
2906{
2907 struct net *net = c->net;
2908 struct xfrm_usersa_flush *p;
2909 struct nlmsghdr *nlh;
2910 struct sk_buff *skb;
2911 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2912
2913 skb = nlmsg_new(len, GFP_ATOMIC);
2914 if (skb == NULL)
2915 return -ENOMEM;
2916
2917 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2918 if (nlh == NULL) {
2919 kfree_skb(skb);
2920 return -EMSGSIZE;
2921 }
2922
2923 p = nlmsg_data(nlh);
2924 p->proto = c->data.proto;
2925
2926 nlmsg_end(skb, nlh);
2927
2928 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2929}
2930
2931static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2932{
2933 unsigned int l = 0;
2934 if (x->aead)
2935 l += nla_total_size(aead_len(x->aead));
2936 if (x->aalg) {
2937 l += nla_total_size(sizeof(struct xfrm_algo) +
2938 (x->aalg->alg_key_len + 7) / 8);
2939 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2940 }
2941 if (x->ealg)
2942 l += nla_total_size(xfrm_alg_len(x->ealg));
2943 if (x->calg)
2944 l += nla_total_size(sizeof(*x->calg));
2945 if (x->encap)
2946 l += nla_total_size(sizeof(*x->encap));
2947 if (x->tfcpad)
2948 l += nla_total_size(sizeof(x->tfcpad));
2949 if (x->replay_esn)
2950 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2951 else
2952 l += nla_total_size(sizeof(struct xfrm_replay_state));
2953 if (x->security)
2954 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2955 x->security->ctx_len);
2956 if (x->coaddr)
2957 l += nla_total_size(sizeof(*x->coaddr));
2958 if (x->props.extra_flags)
2959 l += nla_total_size(sizeof(x->props.extra_flags));
2960 if (x->xso.dev)
2961 l += nla_total_size(sizeof(x->xso));
2962 if (x->props.smark.v | x->props.smark.m) {
2963 l += nla_total_size(sizeof(x->props.smark.v));
2964 l += nla_total_size(sizeof(x->props.smark.m));
2965 }
2966 if (x->if_id)
2967 l += nla_total_size(sizeof(x->if_id));
2968
2969
2970 l += nla_total_size_64bit(sizeof(u64));
2971
2972 return l;
2973}
2974
2975static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2976{
2977 struct net *net = xs_net(x);
2978 struct xfrm_usersa_info *p;
2979 struct xfrm_usersa_id *id;
2980 struct nlmsghdr *nlh;
2981 struct sk_buff *skb;
2982 unsigned int len = xfrm_sa_len(x);
2983 unsigned int headlen;
2984 int err;
2985
2986 headlen = sizeof(*p);
2987 if (c->event == XFRM_MSG_DELSA) {
2988 len += nla_total_size(headlen);
2989 headlen = sizeof(*id);
2990 len += nla_total_size(sizeof(struct xfrm_mark));
2991 }
2992 len += NLMSG_ALIGN(headlen);
2993
2994 skb = nlmsg_new(len, GFP_ATOMIC);
2995 if (skb == NULL)
2996 return -ENOMEM;
2997
2998 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2999 err = -EMSGSIZE;
3000 if (nlh == NULL)
3001 goto out_free_skb;
3002
3003 p = nlmsg_data(nlh);
3004 if (c->event == XFRM_MSG_DELSA) {
3005 struct nlattr *attr;
3006
3007 id = nlmsg_data(nlh);
3008 memset(id, 0, sizeof(*id));
3009 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3010 id->spi = x->id.spi;
3011 id->family = x->props.family;
3012 id->proto = x->id.proto;
3013
3014 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3015 err = -EMSGSIZE;
3016 if (attr == NULL)
3017 goto out_free_skb;
3018
3019 p = nla_data(attr);
3020 }
3021 err = copy_to_user_state_extra(x, p, skb);
3022 if (err)
3023 goto out_free_skb;
3024
3025 nlmsg_end(skb, nlh);
3026
3027 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3028
3029out_free_skb:
3030 kfree_skb(skb);
3031 return err;
3032}
3033
3034static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3035{
3036
3037 switch (c->event) {
3038 case XFRM_MSG_EXPIRE:
3039 return xfrm_exp_state_notify(x, c);
3040 case XFRM_MSG_NEWAE:
3041 return xfrm_aevent_state_notify(x, c);
3042 case XFRM_MSG_DELSA:
3043 case XFRM_MSG_UPDSA:
3044 case XFRM_MSG_NEWSA:
3045 return xfrm_notify_sa(x, c);
3046 case XFRM_MSG_FLUSHSA:
3047 return xfrm_notify_sa_flush(c);
3048 default:
3049 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3050 c->event);
3051 break;
3052 }
3053
3054 return 0;
3055
3056}
3057
3058static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3059 struct xfrm_policy *xp)
3060{
3061 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3062 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3063 + nla_total_size(sizeof(struct xfrm_mark))
3064 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3065 + userpolicy_type_attrsize();
3066}
3067
3068static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3069 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3070{
3071 __u32 seq = xfrm_get_acqseq();
3072 struct xfrm_user_acquire *ua;
3073 struct nlmsghdr *nlh;
3074 int err;
3075
3076 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3077 if (nlh == NULL)
3078 return -EMSGSIZE;
3079
3080 ua = nlmsg_data(nlh);
3081 memcpy(&ua->id, &x->id, sizeof(ua->id));
3082 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3083 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3084 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3085 ua->aalgos = xt->aalgos;
3086 ua->ealgos = xt->ealgos;
3087 ua->calgos = xt->calgos;
3088 ua->seq = x->km.seq = seq;
3089
3090 err = copy_to_user_tmpl(xp, skb);
3091 if (!err)
3092 err = copy_to_user_state_sec_ctx(x, skb);
3093 if (!err)
3094 err = copy_to_user_policy_type(xp->type, skb);
3095 if (!err)
3096 err = xfrm_mark_put(skb, &xp->mark);
3097 if (!err)
3098 err = xfrm_if_id_put(skb, xp->if_id);
3099 if (err) {
3100 nlmsg_cancel(skb, nlh);
3101 return err;
3102 }
3103
3104 nlmsg_end(skb, nlh);
3105 return 0;
3106}
3107
3108static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3109 struct xfrm_policy *xp)
3110{
3111 struct net *net = xs_net(x);
3112 struct sk_buff *skb;
3113 int err;
3114
3115 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3116 if (skb == NULL)
3117 return -ENOMEM;
3118
3119 err = build_acquire(skb, x, xt, xp);
3120 BUG_ON(err < 0);
3121
3122 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3123}
3124
3125
3126
3127
3128static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3129 u8 *data, int len, int *dir)
3130{
3131 struct net *net = sock_net(sk);
3132 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3133 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3134 struct xfrm_policy *xp;
3135 int nr;
3136
3137 switch (sk->sk_family) {
3138 case AF_INET:
3139 if (opt != IP_XFRM_POLICY) {
3140 *dir = -EOPNOTSUPP;
3141 return NULL;
3142 }
3143 break;
3144#if IS_ENABLED(CONFIG_IPV6)
3145 case AF_INET6:
3146 if (opt != IPV6_XFRM_POLICY) {
3147 *dir = -EOPNOTSUPP;
3148 return NULL;
3149 }
3150 break;
3151#endif
3152 default:
3153 *dir = -EINVAL;
3154 return NULL;
3155 }
3156
3157 *dir = -EINVAL;
3158
3159 if (len < sizeof(*p) ||
3160 verify_newpolicy_info(p))
3161 return NULL;
3162
3163 nr = ((len - sizeof(*p)) / sizeof(*ut));
3164 if (validate_tmpl(nr, ut, p->sel.family))
3165 return NULL;
3166
3167 if (p->dir > XFRM_POLICY_OUT)
3168 return NULL;
3169
3170 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3171 if (xp == NULL) {
3172 *dir = -ENOBUFS;
3173 return NULL;
3174 }
3175
3176 copy_from_user_policy(xp, p);
3177 xp->type = XFRM_POLICY_TYPE_MAIN;
3178 copy_templates(xp, ut, nr);
3179
3180 *dir = p->dir;
3181
3182 return xp;
3183}
3184
3185static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3186{
3187 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3188 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3189 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3190 + nla_total_size(sizeof(struct xfrm_mark))
3191 + userpolicy_type_attrsize();
3192}
3193
3194static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3195 int dir, const struct km_event *c)
3196{
3197 struct xfrm_user_polexpire *upe;
3198 int hard = c->data.hard;
3199 struct nlmsghdr *nlh;
3200 int err;
3201
3202 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3203 if (nlh == NULL)
3204 return -EMSGSIZE;
3205
3206 upe = nlmsg_data(nlh);
3207 copy_to_user_policy(xp, &upe->pol, dir);
3208 err = copy_to_user_tmpl(xp, skb);
3209 if (!err)
3210 err = copy_to_user_sec_ctx(xp, skb);
3211 if (!err)
3212 err = copy_to_user_policy_type(xp->type, skb);
3213 if (!err)
3214 err = xfrm_mark_put(skb, &xp->mark);
3215 if (!err)
3216 err = xfrm_if_id_put(skb, xp->if_id);
3217 if (err) {
3218 nlmsg_cancel(skb, nlh);
3219 return err;
3220 }
3221 upe->hard = !!hard;
3222
3223 nlmsg_end(skb, nlh);
3224 return 0;
3225}
3226
3227static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3228{
3229 struct net *net = xp_net(xp);
3230 struct sk_buff *skb;
3231 int err;
3232
3233 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3234 if (skb == NULL)
3235 return -ENOMEM;
3236
3237 err = build_polexpire(skb, xp, dir, c);
3238 BUG_ON(err < 0);
3239
3240 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3241}
3242
3243static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3244{
3245 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3246 struct net *net = xp_net(xp);
3247 struct xfrm_userpolicy_info *p;
3248 struct xfrm_userpolicy_id *id;
3249 struct nlmsghdr *nlh;
3250 struct sk_buff *skb;
3251 unsigned int headlen;
3252 int err;
3253
3254 headlen = sizeof(*p);
3255 if (c->event == XFRM_MSG_DELPOLICY) {
3256 len += nla_total_size(headlen);
3257 headlen = sizeof(*id);
3258 }
3259 len += userpolicy_type_attrsize();
3260 len += nla_total_size(sizeof(struct xfrm_mark));
3261 len += NLMSG_ALIGN(headlen);
3262
3263 skb = nlmsg_new(len, GFP_ATOMIC);
3264 if (skb == NULL)
3265 return -ENOMEM;
3266
3267 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3268 err = -EMSGSIZE;
3269 if (nlh == NULL)
3270 goto out_free_skb;
3271
3272 p = nlmsg_data(nlh);
3273 if (c->event == XFRM_MSG_DELPOLICY) {
3274 struct nlattr *attr;
3275
3276 id = nlmsg_data(nlh);
3277 memset(id, 0, sizeof(*id));
3278 id->dir = dir;
3279 if (c->data.byid)
3280 id->index = xp->index;
3281 else
3282 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3283
3284 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3285 err = -EMSGSIZE;
3286 if (attr == NULL)
3287 goto out_free_skb;
3288
3289 p = nla_data(attr);
3290 }
3291
3292 copy_to_user_policy(xp, p, dir);
3293 err = copy_to_user_tmpl(xp, skb);
3294 if (!err)
3295 err = copy_to_user_policy_type(xp->type, skb);
3296 if (!err)
3297 err = xfrm_mark_put(skb, &xp->mark);
3298 if (!err)
3299 err = xfrm_if_id_put(skb, xp->if_id);
3300 if (err)
3301 goto out_free_skb;
3302
3303 nlmsg_end(skb, nlh);
3304
3305 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3306
3307out_free_skb:
3308 kfree_skb(skb);
3309 return err;
3310}
3311
3312static int xfrm_notify_policy_flush(const struct km_event *c)
3313{
3314 struct net *net = c->net;
3315 struct nlmsghdr *nlh;
3316 struct sk_buff *skb;
3317 int err;
3318
3319 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3320 if (skb == NULL)
3321 return -ENOMEM;
3322
3323 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3324 err = -EMSGSIZE;
3325 if (nlh == NULL)
3326 goto out_free_skb;
3327 err = copy_to_user_policy_type(c->data.type, skb);
3328 if (err)
3329 goto out_free_skb;
3330
3331 nlmsg_end(skb, nlh);
3332
3333 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3334
3335out_free_skb:
3336 kfree_skb(skb);
3337 return err;
3338}
3339
3340static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3341{
3342
3343 switch (c->event) {
3344 case XFRM_MSG_NEWPOLICY:
3345 case XFRM_MSG_UPDPOLICY:
3346 case XFRM_MSG_DELPOLICY:
3347 return xfrm_notify_policy(xp, dir, c);
3348 case XFRM_MSG_FLUSHPOLICY:
3349 return xfrm_notify_policy_flush(c);
3350 case XFRM_MSG_POLEXPIRE:
3351 return xfrm_exp_policy_notify(xp, dir, c);
3352 default:
3353 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3354 c->event);
3355 }
3356
3357 return 0;
3358
3359}
3360
3361static inline unsigned int xfrm_report_msgsize(void)
3362{
3363 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3364}
3365
3366static int build_report(struct sk_buff *skb, u8 proto,
3367 struct xfrm_selector *sel, xfrm_address_t *addr)
3368{
3369 struct xfrm_user_report *ur;
3370 struct nlmsghdr *nlh;
3371
3372 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3373 if (nlh == NULL)
3374 return -EMSGSIZE;
3375
3376 ur = nlmsg_data(nlh);
3377 ur->proto = proto;
3378 memcpy(&ur->sel, sel, sizeof(ur->sel));
3379
3380 if (addr) {
3381 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3382 if (err) {
3383 nlmsg_cancel(skb, nlh);
3384 return err;
3385 }
3386 }
3387 nlmsg_end(skb, nlh);
3388 return 0;
3389}
3390
3391static int xfrm_send_report(struct net *net, u8 proto,
3392 struct xfrm_selector *sel, xfrm_address_t *addr)
3393{
3394 struct sk_buff *skb;
3395 int err;
3396
3397 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3398 if (skb == NULL)
3399 return -ENOMEM;
3400
3401 err = build_report(skb, proto, sel, addr);
3402 BUG_ON(err < 0);
3403
3404 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3405}
3406
3407static inline unsigned int xfrm_mapping_msgsize(void)
3408{
3409 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3410}
3411
3412static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3413 xfrm_address_t *new_saddr, __be16 new_sport)
3414{
3415 struct xfrm_user_mapping *um;
3416 struct nlmsghdr *nlh;
3417
3418 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3419 if (nlh == NULL)
3420 return -EMSGSIZE;
3421
3422 um = nlmsg_data(nlh);
3423
3424 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3425 um->id.spi = x->id.spi;
3426 um->id.family = x->props.family;
3427 um->id.proto = x->id.proto;
3428 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3429 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3430 um->new_sport = new_sport;
3431 um->old_sport = x->encap->encap_sport;
3432 um->reqid = x->props.reqid;
3433
3434 nlmsg_end(skb, nlh);
3435 return 0;
3436}
3437
3438static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3439 __be16 sport)
3440{
3441 struct net *net = xs_net(x);
3442 struct sk_buff *skb;
3443 int err;
3444
3445 if (x->id.proto != IPPROTO_ESP)
3446 return -EINVAL;
3447
3448 if (!x->encap)
3449 return -EINVAL;
3450
3451 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3452 if (skb == NULL)
3453 return -ENOMEM;
3454
3455 err = build_mapping(skb, x, ipaddr, sport);
3456 BUG_ON(err < 0);
3457
3458 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3459}
3460
3461static bool xfrm_is_alive(const struct km_event *c)
3462{
3463 return (bool)xfrm_acquire_is_on(c->net);
3464}
3465
3466static struct xfrm_mgr netlink_mgr = {
3467 .notify = xfrm_send_state_notify,
3468 .acquire = xfrm_send_acquire,
3469 .compile_policy = xfrm_compile_policy,
3470 .notify_policy = xfrm_send_policy_notify,
3471 .report = xfrm_send_report,
3472 .migrate = xfrm_send_migrate,
3473 .new_mapping = xfrm_send_mapping,
3474 .is_alive = xfrm_is_alive,
3475};
3476
3477static int __net_init xfrm_user_net_init(struct net *net)
3478{
3479 struct sock *nlsk;
3480 struct netlink_kernel_cfg cfg = {
3481 .groups = XFRMNLGRP_MAX,
3482 .input = xfrm_netlink_rcv,
3483 };
3484
3485 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3486 if (nlsk == NULL)
3487 return -ENOMEM;
3488 net->xfrm.nlsk_stash = nlsk;
3489 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3490 return 0;
3491}
3492
3493static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3494{
3495 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3496}
3497
3498static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3499{
3500 struct net *net;
3501
3502 list_for_each_entry(net, net_exit_list, exit_list)
3503 netlink_kernel_release(net->xfrm.nlsk_stash);
3504}
3505
3506static struct pernet_operations xfrm_user_net_ops = {
3507 .init = xfrm_user_net_init,
3508 .pre_exit = xfrm_user_net_pre_exit,
3509 .exit_batch = xfrm_user_net_exit,
3510};
3511
3512static int __init xfrm_user_init(void)
3513{
3514 int rv;
3515
3516 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3517
3518 rv = register_pernet_subsys(&xfrm_user_net_ops);
3519 if (rv < 0)
3520 return rv;
3521 rv = xfrm_register_km(&netlink_mgr);
3522 if (rv < 0)
3523 unregister_pernet_subsys(&xfrm_user_net_ops);
3524 return rv;
3525}
3526
3527static void __exit xfrm_user_exit(void)
3528{
3529 xfrm_unregister_km(&netlink_mgr);
3530 unregister_pernet_subsys(&xfrm_user_net_ops);
3531}
3532
3533module_init(xfrm_user_init);
3534module_exit(xfrm_user_exit);
3535MODULE_LICENSE("GPL");
3536MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3537
