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1// SPDX-License-Identifier: GPL-2.0-only
2/* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
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 != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
114 return -EINVAL;
115
116 return 0;
117}
118
119static inline int verify_replay(struct xfrm_usersa_info *p,
120 struct nlattr **attrs)
121{
122 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
123 struct xfrm_replay_state_esn *rs;
124
125 if (!rt)
126 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136
137 /* As only ESP and AH support ESN feature. */
138 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
139 return -EINVAL;
140
141 if (p->replay_window != 0)
142 return -EINVAL;
143
144 return 0;
145}
146
147static int verify_newsa_info(struct xfrm_usersa_info *p,
148 struct nlattr **attrs)
149{
150 int err;
151
152 err = -EINVAL;
153 switch (p->family) {
154 case AF_INET:
155 break;
156
157 case AF_INET6:
158#if IS_ENABLED(CONFIG_IPV6)
159 break;
160#else
161 err = -EAFNOSUPPORT;
162 goto out;
163#endif
164
165 default:
166 goto out;
167 }
168
169 switch (p->sel.family) {
170 case AF_UNSPEC:
171 break;
172
173 case AF_INET:
174 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
175 goto out;
176
177 break;
178
179 case AF_INET6:
180#if IS_ENABLED(CONFIG_IPV6)
181 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
182 goto out;
183
184 break;
185#else
186 err = -EAFNOSUPPORT;
187 goto out;
188#endif
189
190 default:
191 goto out;
192 }
193
194 err = -EINVAL;
195 switch (p->id.proto) {
196 case IPPROTO_AH:
197 if ((!attrs[XFRMA_ALG_AUTH] &&
198 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
199 attrs[XFRMA_ALG_AEAD] ||
200 attrs[XFRMA_ALG_CRYPT] ||
201 attrs[XFRMA_ALG_COMP] ||
202 attrs[XFRMA_TFCPAD])
203 goto out;
204 break;
205
206 case IPPROTO_ESP:
207 if (attrs[XFRMA_ALG_COMP])
208 goto out;
209 if (!attrs[XFRMA_ALG_AUTH] &&
210 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
211 !attrs[XFRMA_ALG_CRYPT] &&
212 !attrs[XFRMA_ALG_AEAD])
213 goto out;
214 if ((attrs[XFRMA_ALG_AUTH] ||
215 attrs[XFRMA_ALG_AUTH_TRUNC] ||
216 attrs[XFRMA_ALG_CRYPT]) &&
217 attrs[XFRMA_ALG_AEAD])
218 goto out;
219 if (attrs[XFRMA_TFCPAD] &&
220 p->mode != XFRM_MODE_TUNNEL)
221 goto out;
222 break;
223
224 case IPPROTO_COMP:
225 if (!attrs[XFRMA_ALG_COMP] ||
226 attrs[XFRMA_ALG_AEAD] ||
227 attrs[XFRMA_ALG_AUTH] ||
228 attrs[XFRMA_ALG_AUTH_TRUNC] ||
229 attrs[XFRMA_ALG_CRYPT] ||
230 attrs[XFRMA_TFCPAD] ||
231 (ntohl(p->id.spi) >= 0x10000))
232 goto out;
233 break;
234
235#if IS_ENABLED(CONFIG_IPV6)
236 case IPPROTO_DSTOPTS:
237 case IPPROTO_ROUTING:
238 if (attrs[XFRMA_ALG_COMP] ||
239 attrs[XFRMA_ALG_AUTH] ||
240 attrs[XFRMA_ALG_AUTH_TRUNC] ||
241 attrs[XFRMA_ALG_AEAD] ||
242 attrs[XFRMA_ALG_CRYPT] ||
243 attrs[XFRMA_ENCAP] ||
244 attrs[XFRMA_SEC_CTX] ||
245 attrs[XFRMA_TFCPAD] ||
246 !attrs[XFRMA_COADDR])
247 goto out;
248 break;
249#endif
250
251 default:
252 goto out;
253 }
254
255 if ((err = verify_aead(attrs)))
256 goto out;
257 if ((err = verify_auth_trunc(attrs)))
258 goto out;
259 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
260 goto out;
261 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
262 goto out;
263 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
264 goto out;
265 if ((err = verify_sec_ctx_len(attrs)))
266 goto out;
267 if ((err = verify_replay(p, attrs)))
268 goto out;
269
270 err = -EINVAL;
271 switch (p->mode) {
272 case XFRM_MODE_TRANSPORT:
273 case XFRM_MODE_TUNNEL:
274 case XFRM_MODE_ROUTEOPTIMIZATION:
275 case XFRM_MODE_BEET:
276 break;
277
278 default:
279 goto out;
280 }
281
282 err = 0;
283
284out:
285 return err;
286}
287
288static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
289 struct xfrm_algo_desc *(*get_byname)(const char *, int),
290 struct nlattr *rta)
291{
292 struct xfrm_algo *p, *ualg;
293 struct xfrm_algo_desc *algo;
294
295 if (!rta)
296 return 0;
297
298 ualg = nla_data(rta);
299
300 algo = get_byname(ualg->alg_name, 1);
301 if (!algo)
302 return -ENOSYS;
303 *props = algo->desc.sadb_alg_id;
304
305 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
306 if (!p)
307 return -ENOMEM;
308
309 strcpy(p->alg_name, algo->name);
310 *algpp = p;
311 return 0;
312}
313
314static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
315{
316 struct xfrm_algo *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 x->props.ealgo = algo->desc.sadb_alg_id;
328
329 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
330 if (!p)
331 return -ENOMEM;
332
333 strcpy(p->alg_name, algo->name);
334 x->ealg = p;
335 x->geniv = algo->uinfo.encr.geniv;
336 return 0;
337}
338
339static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
340 struct nlattr *rta)
341{
342 struct xfrm_algo *ualg;
343 struct xfrm_algo_auth *p;
344 struct xfrm_algo_desc *algo;
345
346 if (!rta)
347 return 0;
348
349 ualg = nla_data(rta);
350
351 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
352 if (!algo)
353 return -ENOSYS;
354 *props = algo->desc.sadb_alg_id;
355
356 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
357 if (!p)
358 return -ENOMEM;
359
360 strcpy(p->alg_name, algo->name);
361 p->alg_key_len = ualg->alg_key_len;
362 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
363 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
364
365 *algpp = p;
366 return 0;
367}
368
369static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
370 struct nlattr *rta)
371{
372 struct xfrm_algo_auth *p, *ualg;
373 struct xfrm_algo_desc *algo;
374
375 if (!rta)
376 return 0;
377
378 ualg = nla_data(rta);
379
380 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
381 if (!algo)
382 return -ENOSYS;
383 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
384 return -EINVAL;
385 *props = algo->desc.sadb_alg_id;
386
387 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
388 if (!p)
389 return -ENOMEM;
390
391 strcpy(p->alg_name, algo->name);
392 if (!p->alg_trunc_len)
393 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
394
395 *algpp = p;
396 return 0;
397}
398
399static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
400{
401 struct xfrm_algo_aead *p, *ualg;
402 struct xfrm_algo_desc *algo;
403
404 if (!rta)
405 return 0;
406
407 ualg = nla_data(rta);
408
409 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
410 if (!algo)
411 return -ENOSYS;
412 x->props.ealgo = algo->desc.sadb_alg_id;
413
414 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
415 if (!p)
416 return -ENOMEM;
417
418 strcpy(p->alg_name, algo->name);
419 x->aead = p;
420 x->geniv = algo->uinfo.aead.geniv;
421 return 0;
422}
423
424static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
425 struct nlattr *rp)
426{
427 struct xfrm_replay_state_esn *up;
428 unsigned int ulen;
429
430 if (!replay_esn || !rp)
431 return 0;
432
433 up = nla_data(rp);
434 ulen = xfrm_replay_state_esn_len(up);
435
436 /* Check the overall length and the internal bitmap length to avoid
437 * potential overflow. */
438 if (nla_len(rp) < (int)ulen ||
439 xfrm_replay_state_esn_len(replay_esn) != ulen ||
440 replay_esn->bmp_len != up->bmp_len)
441 return -EINVAL;
442
443 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
444 return -EINVAL;
445
446 return 0;
447}
448
449static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
450 struct xfrm_replay_state_esn **preplay_esn,
451 struct nlattr *rta)
452{
453 struct xfrm_replay_state_esn *p, *pp, *up;
454 unsigned int klen, ulen;
455
456 if (!rta)
457 return 0;
458
459 up = nla_data(rta);
460 klen = xfrm_replay_state_esn_len(up);
461 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
462
463 p = kzalloc(klen, GFP_KERNEL);
464 if (!p)
465 return -ENOMEM;
466
467 pp = kzalloc(klen, GFP_KERNEL);
468 if (!pp) {
469 kfree(p);
470 return -ENOMEM;
471 }
472
473 memcpy(p, up, ulen);
474 memcpy(pp, up, ulen);
475
476 *replay_esn = p;
477 *preplay_esn = pp;
478
479 return 0;
480}
481
482static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
483{
484 unsigned int len = 0;
485
486 if (xfrm_ctx) {
487 len += sizeof(struct xfrm_user_sec_ctx);
488 len += xfrm_ctx->ctx_len;
489 }
490 return len;
491}
492
493static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
494{
495 memcpy(&x->id, &p->id, sizeof(x->id));
496 memcpy(&x->sel, &p->sel, sizeof(x->sel));
497 memcpy(&x->lft, &p->lft, sizeof(x->lft));
498 x->props.mode = p->mode;
499 x->props.replay_window = min_t(unsigned int, p->replay_window,
500 sizeof(x->replay.bitmap) * 8);
501 x->props.reqid = p->reqid;
502 x->props.family = p->family;
503 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
504 x->props.flags = p->flags;
505
506 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
507 x->sel.family = p->family;
508}
509
510/*
511 * someday when pfkey also has support, we could have the code
512 * somehow made shareable and move it to xfrm_state.c - JHS
513 *
514*/
515static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
516 int update_esn)
517{
518 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
519 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
520 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
521 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
522 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
523
524 if (re) {
525 struct xfrm_replay_state_esn *replay_esn;
526 replay_esn = nla_data(re);
527 memcpy(x->replay_esn, replay_esn,
528 xfrm_replay_state_esn_len(replay_esn));
529 memcpy(x->preplay_esn, replay_esn,
530 xfrm_replay_state_esn_len(replay_esn));
531 }
532
533 if (rp) {
534 struct xfrm_replay_state *replay;
535 replay = nla_data(rp);
536 memcpy(&x->replay, replay, sizeof(*replay));
537 memcpy(&x->preplay, replay, sizeof(*replay));
538 }
539
540 if (lt) {
541 struct xfrm_lifetime_cur *ltime;
542 ltime = nla_data(lt);
543 x->curlft.bytes = ltime->bytes;
544 x->curlft.packets = ltime->packets;
545 x->curlft.add_time = ltime->add_time;
546 x->curlft.use_time = ltime->use_time;
547 }
548
549 if (et)
550 x->replay_maxage = nla_get_u32(et);
551
552 if (rt)
553 x->replay_maxdiff = nla_get_u32(rt);
554}
555
556static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
557{
558 if (attrs[XFRMA_SET_MARK]) {
559 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
560 if (attrs[XFRMA_SET_MARK_MASK])
561 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
562 else
563 m->m = 0xffffffff;
564 } else {
565 m->v = m->m = 0;
566 }
567}
568
569static struct xfrm_state *xfrm_state_construct(struct net *net,
570 struct xfrm_usersa_info *p,
571 struct nlattr **attrs,
572 int *errp)
573{
574 struct xfrm_state *x = xfrm_state_alloc(net);
575 int err = -ENOMEM;
576
577 if (!x)
578 goto error_no_put;
579
580 copy_from_user_state(x, p);
581
582 if (attrs[XFRMA_SA_EXTRA_FLAGS])
583 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
584
585 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
586 goto error;
587 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
588 attrs[XFRMA_ALG_AUTH_TRUNC])))
589 goto error;
590 if (!x->props.aalgo) {
591 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
592 attrs[XFRMA_ALG_AUTH])))
593 goto error;
594 }
595 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
596 goto error;
597 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
598 xfrm_calg_get_byname,
599 attrs[XFRMA_ALG_COMP])))
600 goto error;
601
602 if (attrs[XFRMA_ENCAP]) {
603 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
604 sizeof(*x->encap), GFP_KERNEL);
605 if (x->encap == NULL)
606 goto error;
607 }
608
609 if (attrs[XFRMA_TFCPAD])
610 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
611
612 if (attrs[XFRMA_COADDR]) {
613 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
614 sizeof(*x->coaddr), GFP_KERNEL);
615 if (x->coaddr == NULL)
616 goto error;
617 }
618
619 xfrm_mark_get(attrs, &x->mark);
620
621 xfrm_smark_init(attrs, &x->props.smark);
622
623 if (attrs[XFRMA_IF_ID])
624 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
625
626 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
627 if (err)
628 goto error;
629
630 if (attrs[XFRMA_SEC_CTX]) {
631 err = security_xfrm_state_alloc(x,
632 nla_data(attrs[XFRMA_SEC_CTX]));
633 if (err)
634 goto error;
635 }
636
637 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
638 attrs[XFRMA_REPLAY_ESN_VAL])))
639 goto error;
640
641 x->km.seq = p->seq;
642 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
643 /* sysctl_xfrm_aevent_etime is in 100ms units */
644 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
645
646 if ((err = xfrm_init_replay(x)))
647 goto error;
648
649 /* override default values from above */
650 xfrm_update_ae_params(x, attrs, 0);
651
652 /* configure the hardware if offload is requested */
653 if (attrs[XFRMA_OFFLOAD_DEV]) {
654 err = xfrm_dev_state_add(net, x,
655 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
656 if (err)
657 goto error;
658 }
659
660 return x;
661
662error:
663 x->km.state = XFRM_STATE_DEAD;
664 xfrm_state_put(x);
665error_no_put:
666 *errp = err;
667 return NULL;
668}
669
670static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
671 struct nlattr **attrs)
672{
673 struct net *net = sock_net(skb->sk);
674 struct xfrm_usersa_info *p = nlmsg_data(nlh);
675 struct xfrm_state *x;
676 int err;
677 struct km_event c;
678
679 err = verify_newsa_info(p, attrs);
680 if (err)
681 return err;
682
683 x = xfrm_state_construct(net, p, attrs, &err);
684 if (!x)
685 return err;
686
687 xfrm_state_hold(x);
688 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
689 err = xfrm_state_add(x);
690 else
691 err = xfrm_state_update(x);
692
693 xfrm_audit_state_add(x, err ? 0 : 1, true);
694
695 if (err < 0) {
696 x->km.state = XFRM_STATE_DEAD;
697 xfrm_dev_state_delete(x);
698 __xfrm_state_put(x);
699 goto out;
700 }
701
702 if (x->km.state == XFRM_STATE_VOID)
703 x->km.state = XFRM_STATE_VALID;
704
705 c.seq = nlh->nlmsg_seq;
706 c.portid = nlh->nlmsg_pid;
707 c.event = nlh->nlmsg_type;
708
709 km_state_notify(x, &c);
710out:
711 xfrm_state_put(x);
712 return err;
713}
714
715static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
716 struct xfrm_usersa_id *p,
717 struct nlattr **attrs,
718 int *errp)
719{
720 struct xfrm_state *x = NULL;
721 struct xfrm_mark m;
722 int err;
723 u32 mark = xfrm_mark_get(attrs, &m);
724
725 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
726 err = -ESRCH;
727 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
728 } else {
729 xfrm_address_t *saddr = NULL;
730
731 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
732 if (!saddr) {
733 err = -EINVAL;
734 goto out;
735 }
736
737 err = -ESRCH;
738 x = xfrm_state_lookup_byaddr(net, mark,
739 &p->daddr, saddr,
740 p->proto, p->family);
741 }
742
743 out:
744 if (!x && errp)
745 *errp = err;
746 return x;
747}
748
749static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
750 struct nlattr **attrs)
751{
752 struct net *net = sock_net(skb->sk);
753 struct xfrm_state *x;
754 int err = -ESRCH;
755 struct km_event c;
756 struct xfrm_usersa_id *p = nlmsg_data(nlh);
757
758 x = xfrm_user_state_lookup(net, p, attrs, &err);
759 if (x == NULL)
760 return err;
761
762 if ((err = security_xfrm_state_delete(x)) != 0)
763 goto out;
764
765 if (xfrm_state_kern(x)) {
766 err = -EPERM;
767 goto out;
768 }
769
770 err = xfrm_state_delete(x);
771
772 if (err < 0)
773 goto out;
774
775 c.seq = nlh->nlmsg_seq;
776 c.portid = nlh->nlmsg_pid;
777 c.event = nlh->nlmsg_type;
778 km_state_notify(x, &c);
779
780out:
781 xfrm_audit_state_delete(x, err ? 0 : 1, true);
782 xfrm_state_put(x);
783 return err;
784}
785
786static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
787{
788 memset(p, 0, sizeof(*p));
789 memcpy(&p->id, &x->id, sizeof(p->id));
790 memcpy(&p->sel, &x->sel, sizeof(p->sel));
791 memcpy(&p->lft, &x->lft, sizeof(p->lft));
792 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
793 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
794 put_unaligned(x->stats.replay, &p->stats.replay);
795 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
796 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
797 p->mode = x->props.mode;
798 p->replay_window = x->props.replay_window;
799 p->reqid = x->props.reqid;
800 p->family = x->props.family;
801 p->flags = x->props.flags;
802 p->seq = x->km.seq;
803}
804
805struct xfrm_dump_info {
806 struct sk_buff *in_skb;
807 struct sk_buff *out_skb;
808 u32 nlmsg_seq;
809 u16 nlmsg_flags;
810};
811
812static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
813{
814 struct xfrm_user_sec_ctx *uctx;
815 struct nlattr *attr;
816 int ctx_size = sizeof(*uctx) + s->ctx_len;
817
818 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
819 if (attr == NULL)
820 return -EMSGSIZE;
821
822 uctx = nla_data(attr);
823 uctx->exttype = XFRMA_SEC_CTX;
824 uctx->len = ctx_size;
825 uctx->ctx_doi = s->ctx_doi;
826 uctx->ctx_alg = s->ctx_alg;
827 uctx->ctx_len = s->ctx_len;
828 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
829
830 return 0;
831}
832
833static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
834{
835 struct xfrm_user_offload *xuo;
836 struct nlattr *attr;
837
838 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
839 if (attr == NULL)
840 return -EMSGSIZE;
841
842 xuo = nla_data(attr);
843 memset(xuo, 0, sizeof(*xuo));
844 xuo->ifindex = xso->dev->ifindex;
845 xuo->flags = xso->flags;
846
847 return 0;
848}
849
850static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
851{
852 struct xfrm_algo *algo;
853 struct nlattr *nla;
854
855 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
856 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
857 if (!nla)
858 return -EMSGSIZE;
859
860 algo = nla_data(nla);
861 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
862 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
863 algo->alg_key_len = auth->alg_key_len;
864
865 return 0;
866}
867
868static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
869{
870 int ret = 0;
871
872 if (m->v | m->m) {
873 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
874 if (!ret)
875 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
876 }
877 return ret;
878}
879
880/* Don't change this without updating xfrm_sa_len! */
881static int copy_to_user_state_extra(struct xfrm_state *x,
882 struct xfrm_usersa_info *p,
883 struct sk_buff *skb)
884{
885 int ret = 0;
886
887 copy_to_user_state(x, p);
888
889 if (x->props.extra_flags) {
890 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
891 x->props.extra_flags);
892 if (ret)
893 goto out;
894 }
895
896 if (x->coaddr) {
897 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
898 if (ret)
899 goto out;
900 }
901 if (x->lastused) {
902 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
903 XFRMA_PAD);
904 if (ret)
905 goto out;
906 }
907 if (x->aead) {
908 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
909 if (ret)
910 goto out;
911 }
912 if (x->aalg) {
913 ret = copy_to_user_auth(x->aalg, skb);
914 if (!ret)
915 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
916 xfrm_alg_auth_len(x->aalg), x->aalg);
917 if (ret)
918 goto out;
919 }
920 if (x->ealg) {
921 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
922 if (ret)
923 goto out;
924 }
925 if (x->calg) {
926 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
927 if (ret)
928 goto out;
929 }
930 if (x->encap) {
931 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
932 if (ret)
933 goto out;
934 }
935 if (x->tfcpad) {
936 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
937 if (ret)
938 goto out;
939 }
940 ret = xfrm_mark_put(skb, &x->mark);
941 if (ret)
942 goto out;
943
944 ret = xfrm_smark_put(skb, &x->props.smark);
945 if (ret)
946 goto out;
947
948 if (x->replay_esn)
949 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
950 xfrm_replay_state_esn_len(x->replay_esn),
951 x->replay_esn);
952 else
953 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
954 &x->replay);
955 if (ret)
956 goto out;
957 if(x->xso.dev)
958 ret = copy_user_offload(&x->xso, skb);
959 if (ret)
960 goto out;
961 if (x->if_id) {
962 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
963 if (ret)
964 goto out;
965 }
966 if (x->security)
967 ret = copy_sec_ctx(x->security, skb);
968out:
969 return ret;
970}
971
972static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
973{
974 struct xfrm_dump_info *sp = ptr;
975 struct sk_buff *in_skb = sp->in_skb;
976 struct sk_buff *skb = sp->out_skb;
977 struct xfrm_usersa_info *p;
978 struct nlmsghdr *nlh;
979 int err;
980
981 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
982 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
983 if (nlh == NULL)
984 return -EMSGSIZE;
985
986 p = nlmsg_data(nlh);
987
988 err = copy_to_user_state_extra(x, p, skb);
989 if (err) {
990 nlmsg_cancel(skb, nlh);
991 return err;
992 }
993 nlmsg_end(skb, nlh);
994 return 0;
995}
996
997static int xfrm_dump_sa_done(struct netlink_callback *cb)
998{
999 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1000 struct sock *sk = cb->skb->sk;
1001 struct net *net = sock_net(sk);
1002
1003 if (cb->args[0])
1004 xfrm_state_walk_done(walk, net);
1005 return 0;
1006}
1007
1008static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1009static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1010{
1011 struct net *net = sock_net(skb->sk);
1012 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1013 struct xfrm_dump_info info;
1014
1015 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1016 sizeof(cb->args) - sizeof(cb->args[0]));
1017
1018 info.in_skb = cb->skb;
1019 info.out_skb = skb;
1020 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1021 info.nlmsg_flags = NLM_F_MULTI;
1022
1023 if (!cb->args[0]) {
1024 struct nlattr *attrs[XFRMA_MAX+1];
1025 struct xfrm_address_filter *filter = NULL;
1026 u8 proto = 0;
1027 int err;
1028
1029 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1030 xfrma_policy, cb->extack);
1031 if (err < 0)
1032 return err;
1033
1034 if (attrs[XFRMA_ADDRESS_FILTER]) {
1035 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1036 sizeof(*filter), GFP_KERNEL);
1037 if (filter == NULL)
1038 return -ENOMEM;
1039 }
1040
1041 if (attrs[XFRMA_PROTO])
1042 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1043
1044 xfrm_state_walk_init(walk, proto, filter);
1045 cb->args[0] = 1;
1046 }
1047
1048 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1049
1050 return skb->len;
1051}
1052
1053static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1054 struct xfrm_state *x, u32 seq)
1055{
1056 struct xfrm_dump_info info;
1057 struct sk_buff *skb;
1058 int err;
1059
1060 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1061 if (!skb)
1062 return ERR_PTR(-ENOMEM);
1063
1064 info.in_skb = in_skb;
1065 info.out_skb = skb;
1066 info.nlmsg_seq = seq;
1067 info.nlmsg_flags = 0;
1068
1069 err = dump_one_state(x, 0, &info);
1070 if (err) {
1071 kfree_skb(skb);
1072 return ERR_PTR(err);
1073 }
1074
1075 return skb;
1076}
1077
1078/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1079 * Must be called with RCU read lock.
1080 */
1081static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1082 u32 pid, unsigned int group)
1083{
1084 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1085
1086 if (!nlsk) {
1087 kfree_skb(skb);
1088 return -EPIPE;
1089 }
1090
1091 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1092}
1093
1094static inline unsigned int xfrm_spdinfo_msgsize(void)
1095{
1096 return NLMSG_ALIGN(4)
1097 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1098 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1099 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1100 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1101}
1102
1103static int build_spdinfo(struct sk_buff *skb, struct net *net,
1104 u32 portid, u32 seq, u32 flags)
1105{
1106 struct xfrmk_spdinfo si;
1107 struct xfrmu_spdinfo spc;
1108 struct xfrmu_spdhinfo sph;
1109 struct xfrmu_spdhthresh spt4, spt6;
1110 struct nlmsghdr *nlh;
1111 int err;
1112 u32 *f;
1113 unsigned lseq;
1114
1115 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1116 if (nlh == NULL) /* shouldn't really happen ... */
1117 return -EMSGSIZE;
1118
1119 f = nlmsg_data(nlh);
1120 *f = flags;
1121 xfrm_spd_getinfo(net, &si);
1122 spc.incnt = si.incnt;
1123 spc.outcnt = si.outcnt;
1124 spc.fwdcnt = si.fwdcnt;
1125 spc.inscnt = si.inscnt;
1126 spc.outscnt = si.outscnt;
1127 spc.fwdscnt = si.fwdscnt;
1128 sph.spdhcnt = si.spdhcnt;
1129 sph.spdhmcnt = si.spdhmcnt;
1130
1131 do {
1132 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1133
1134 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1135 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1136 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1137 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1138 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1139
1140 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1141 if (!err)
1142 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1143 if (!err)
1144 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1145 if (!err)
1146 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1147 if (err) {
1148 nlmsg_cancel(skb, nlh);
1149 return err;
1150 }
1151
1152 nlmsg_end(skb, nlh);
1153 return 0;
1154}
1155
1156static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1157 struct nlattr **attrs)
1158{
1159 struct net *net = sock_net(skb->sk);
1160 struct xfrmu_spdhthresh *thresh4 = NULL;
1161 struct xfrmu_spdhthresh *thresh6 = NULL;
1162
1163 /* selector prefixlen thresholds to hash policies */
1164 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1165 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1166
1167 if (nla_len(rta) < sizeof(*thresh4))
1168 return -EINVAL;
1169 thresh4 = nla_data(rta);
1170 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1171 return -EINVAL;
1172 }
1173 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1174 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1175
1176 if (nla_len(rta) < sizeof(*thresh6))
1177 return -EINVAL;
1178 thresh6 = nla_data(rta);
1179 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1180 return -EINVAL;
1181 }
1182
1183 if (thresh4 || thresh6) {
1184 write_seqlock(&net->xfrm.policy_hthresh.lock);
1185 if (thresh4) {
1186 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1187 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1188 }
1189 if (thresh6) {
1190 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1191 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1192 }
1193 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1194
1195 xfrm_policy_hash_rebuild(net);
1196 }
1197
1198 return 0;
1199}
1200
1201static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1202 struct nlattr **attrs)
1203{
1204 struct net *net = sock_net(skb->sk);
1205 struct sk_buff *r_skb;
1206 u32 *flags = nlmsg_data(nlh);
1207 u32 sportid = NETLINK_CB(skb).portid;
1208 u32 seq = nlh->nlmsg_seq;
1209 int err;
1210
1211 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1212 if (r_skb == NULL)
1213 return -ENOMEM;
1214
1215 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1216 BUG_ON(err < 0);
1217
1218 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1219}
1220
1221static inline unsigned int xfrm_sadinfo_msgsize(void)
1222{
1223 return NLMSG_ALIGN(4)
1224 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1225 + nla_total_size(4); /* XFRMA_SAD_CNT */
1226}
1227
1228static int build_sadinfo(struct sk_buff *skb, struct net *net,
1229 u32 portid, u32 seq, u32 flags)
1230{
1231 struct xfrmk_sadinfo si;
1232 struct xfrmu_sadhinfo sh;
1233 struct nlmsghdr *nlh;
1234 int err;
1235 u32 *f;
1236
1237 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1238 if (nlh == NULL) /* shouldn't really happen ... */
1239 return -EMSGSIZE;
1240
1241 f = nlmsg_data(nlh);
1242 *f = flags;
1243 xfrm_sad_getinfo(net, &si);
1244
1245 sh.sadhmcnt = si.sadhmcnt;
1246 sh.sadhcnt = si.sadhcnt;
1247
1248 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1249 if (!err)
1250 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1251 if (err) {
1252 nlmsg_cancel(skb, nlh);
1253 return err;
1254 }
1255
1256 nlmsg_end(skb, nlh);
1257 return 0;
1258}
1259
1260static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1261 struct nlattr **attrs)
1262{
1263 struct net *net = sock_net(skb->sk);
1264 struct sk_buff *r_skb;
1265 u32 *flags = nlmsg_data(nlh);
1266 u32 sportid = NETLINK_CB(skb).portid;
1267 u32 seq = nlh->nlmsg_seq;
1268 int err;
1269
1270 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1271 if (r_skb == NULL)
1272 return -ENOMEM;
1273
1274 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1275 BUG_ON(err < 0);
1276
1277 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1278}
1279
1280static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1281 struct nlattr **attrs)
1282{
1283 struct net *net = sock_net(skb->sk);
1284 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1285 struct xfrm_state *x;
1286 struct sk_buff *resp_skb;
1287 int err = -ESRCH;
1288
1289 x = xfrm_user_state_lookup(net, p, attrs, &err);
1290 if (x == NULL)
1291 goto out_noput;
1292
1293 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1294 if (IS_ERR(resp_skb)) {
1295 err = PTR_ERR(resp_skb);
1296 } else {
1297 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1298 }
1299 xfrm_state_put(x);
1300out_noput:
1301 return err;
1302}
1303
1304static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1305 struct nlattr **attrs)
1306{
1307 struct net *net = sock_net(skb->sk);
1308 struct xfrm_state *x;
1309 struct xfrm_userspi_info *p;
1310 struct sk_buff *resp_skb;
1311 xfrm_address_t *daddr;
1312 int family;
1313 int err;
1314 u32 mark;
1315 struct xfrm_mark m;
1316 u32 if_id = 0;
1317
1318 p = nlmsg_data(nlh);
1319 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1320 if (err)
1321 goto out_noput;
1322
1323 family = p->info.family;
1324 daddr = &p->info.id.daddr;
1325
1326 x = NULL;
1327
1328 mark = xfrm_mark_get(attrs, &m);
1329
1330 if (attrs[XFRMA_IF_ID])
1331 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1332
1333 if (p->info.seq) {
1334 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1335 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1336 xfrm_state_put(x);
1337 x = NULL;
1338 }
1339 }
1340
1341 if (!x)
1342 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1343 if_id, p->info.id.proto, daddr,
1344 &p->info.saddr, 1,
1345 family);
1346 err = -ENOENT;
1347 if (x == NULL)
1348 goto out_noput;
1349
1350 err = xfrm_alloc_spi(x, p->min, p->max);
1351 if (err)
1352 goto out;
1353
1354 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1355 if (IS_ERR(resp_skb)) {
1356 err = PTR_ERR(resp_skb);
1357 goto out;
1358 }
1359
1360 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1361
1362out:
1363 xfrm_state_put(x);
1364out_noput:
1365 return err;
1366}
1367
1368static int verify_policy_dir(u8 dir)
1369{
1370 switch (dir) {
1371 case XFRM_POLICY_IN:
1372 case XFRM_POLICY_OUT:
1373 case XFRM_POLICY_FWD:
1374 break;
1375
1376 default:
1377 return -EINVAL;
1378 }
1379
1380 return 0;
1381}
1382
1383static int verify_policy_type(u8 type)
1384{
1385 switch (type) {
1386 case XFRM_POLICY_TYPE_MAIN:
1387#ifdef CONFIG_XFRM_SUB_POLICY
1388 case XFRM_POLICY_TYPE_SUB:
1389#endif
1390 break;
1391
1392 default:
1393 return -EINVAL;
1394 }
1395
1396 return 0;
1397}
1398
1399static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1400{
1401 int ret;
1402
1403 switch (p->share) {
1404 case XFRM_SHARE_ANY:
1405 case XFRM_SHARE_SESSION:
1406 case XFRM_SHARE_USER:
1407 case XFRM_SHARE_UNIQUE:
1408 break;
1409
1410 default:
1411 return -EINVAL;
1412 }
1413
1414 switch (p->action) {
1415 case XFRM_POLICY_ALLOW:
1416 case XFRM_POLICY_BLOCK:
1417 break;
1418
1419 default:
1420 return -EINVAL;
1421 }
1422
1423 switch (p->sel.family) {
1424 case AF_INET:
1425 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1426 return -EINVAL;
1427
1428 break;
1429
1430 case AF_INET6:
1431#if IS_ENABLED(CONFIG_IPV6)
1432 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1433 return -EINVAL;
1434
1435 break;
1436#else
1437 return -EAFNOSUPPORT;
1438#endif
1439
1440 default:
1441 return -EINVAL;
1442 }
1443
1444 ret = verify_policy_dir(p->dir);
1445 if (ret)
1446 return ret;
1447 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1448 return -EINVAL;
1449
1450 return 0;
1451}
1452
1453static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1454{
1455 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1456 struct xfrm_user_sec_ctx *uctx;
1457
1458 if (!rt)
1459 return 0;
1460
1461 uctx = nla_data(rt);
1462 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1463}
1464
1465static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1466 int nr)
1467{
1468 int i;
1469
1470 xp->xfrm_nr = nr;
1471 for (i = 0; i < nr; i++, ut++) {
1472 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1473
1474 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1475 memcpy(&t->saddr, &ut->saddr,
1476 sizeof(xfrm_address_t));
1477 t->reqid = ut->reqid;
1478 t->mode = ut->mode;
1479 t->share = ut->share;
1480 t->optional = ut->optional;
1481 t->aalgos = ut->aalgos;
1482 t->ealgos = ut->ealgos;
1483 t->calgos = ut->calgos;
1484 /* If all masks are ~0, then we allow all algorithms. */
1485 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1486 t->encap_family = ut->family;
1487 }
1488}
1489
1490static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1491{
1492 u16 prev_family;
1493 int i;
1494
1495 if (nr > XFRM_MAX_DEPTH)
1496 return -EINVAL;
1497
1498 prev_family = family;
1499
1500 for (i = 0; i < nr; i++) {
1501 /* We never validated the ut->family value, so many
1502 * applications simply leave it at zero. The check was
1503 * never made and ut->family was ignored because all
1504 * templates could be assumed to have the same family as
1505 * the policy itself. Now that we will have ipv4-in-ipv6
1506 * and ipv6-in-ipv4 tunnels, this is no longer true.
1507 */
1508 if (!ut[i].family)
1509 ut[i].family = family;
1510
1511 switch (ut[i].mode) {
1512 case XFRM_MODE_TUNNEL:
1513 case XFRM_MODE_BEET:
1514 break;
1515 default:
1516 if (ut[i].family != prev_family)
1517 return -EINVAL;
1518 break;
1519 }
1520 if (ut[i].mode >= XFRM_MODE_MAX)
1521 return -EINVAL;
1522
1523 prev_family = ut[i].family;
1524
1525 switch (ut[i].family) {
1526 case AF_INET:
1527 break;
1528#if IS_ENABLED(CONFIG_IPV6)
1529 case AF_INET6:
1530 break;
1531#endif
1532 default:
1533 return -EINVAL;
1534 }
1535
1536 if (!xfrm_id_proto_valid(ut[i].id.proto))
1537 return -EINVAL;
1538 }
1539
1540 return 0;
1541}
1542
1543static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1544{
1545 struct nlattr *rt = attrs[XFRMA_TMPL];
1546
1547 if (!rt) {
1548 pol->xfrm_nr = 0;
1549 } else {
1550 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1551 int nr = nla_len(rt) / sizeof(*utmpl);
1552 int err;
1553
1554 err = validate_tmpl(nr, utmpl, pol->family);
1555 if (err)
1556 return err;
1557
1558 copy_templates(pol, utmpl, nr);
1559 }
1560 return 0;
1561}
1562
1563static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1564{
1565 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1566 struct xfrm_userpolicy_type *upt;
1567 u8 type = XFRM_POLICY_TYPE_MAIN;
1568 int err;
1569
1570 if (rt) {
1571 upt = nla_data(rt);
1572 type = upt->type;
1573 }
1574
1575 err = verify_policy_type(type);
1576 if (err)
1577 return err;
1578
1579 *tp = type;
1580 return 0;
1581}
1582
1583static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1584{
1585 xp->priority = p->priority;
1586 xp->index = p->index;
1587 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1588 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1589 xp->action = p->action;
1590 xp->flags = p->flags;
1591 xp->family = p->sel.family;
1592 /* XXX xp->share = p->share; */
1593}
1594
1595static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1596{
1597 memset(p, 0, sizeof(*p));
1598 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1599 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1600 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1601 p->priority = xp->priority;
1602 p->index = xp->index;
1603 p->sel.family = xp->family;
1604 p->dir = dir;
1605 p->action = xp->action;
1606 p->flags = xp->flags;
1607 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1608}
1609
1610static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1611{
1612 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1613 int err;
1614
1615 if (!xp) {
1616 *errp = -ENOMEM;
1617 return NULL;
1618 }
1619
1620 copy_from_user_policy(xp, p);
1621
1622 err = copy_from_user_policy_type(&xp->type, attrs);
1623 if (err)
1624 goto error;
1625
1626 if (!(err = copy_from_user_tmpl(xp, attrs)))
1627 err = copy_from_user_sec_ctx(xp, attrs);
1628 if (err)
1629 goto error;
1630
1631 xfrm_mark_get(attrs, &xp->mark);
1632
1633 if (attrs[XFRMA_IF_ID])
1634 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1635
1636 return xp;
1637 error:
1638 *errp = err;
1639 xp->walk.dead = 1;
1640 xfrm_policy_destroy(xp);
1641 return NULL;
1642}
1643
1644static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1645 struct nlattr **attrs)
1646{
1647 struct net *net = sock_net(skb->sk);
1648 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1649 struct xfrm_policy *xp;
1650 struct km_event c;
1651 int err;
1652 int excl;
1653
1654 err = verify_newpolicy_info(p);
1655 if (err)
1656 return err;
1657 err = verify_sec_ctx_len(attrs);
1658 if (err)
1659 return err;
1660
1661 xp = xfrm_policy_construct(net, p, attrs, &err);
1662 if (!xp)
1663 return err;
1664
1665 /* shouldn't excl be based on nlh flags??
1666 * Aha! this is anti-netlink really i.e more pfkey derived
1667 * in netlink excl is a flag and you wouldnt need
1668 * a type XFRM_MSG_UPDPOLICY - JHS */
1669 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1670 err = xfrm_policy_insert(p->dir, xp, excl);
1671 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1672
1673 if (err) {
1674 security_xfrm_policy_free(xp->security);
1675 kfree(xp);
1676 return err;
1677 }
1678
1679 c.event = nlh->nlmsg_type;
1680 c.seq = nlh->nlmsg_seq;
1681 c.portid = nlh->nlmsg_pid;
1682 km_policy_notify(xp, p->dir, &c);
1683
1684 xfrm_pol_put(xp);
1685
1686 return 0;
1687}
1688
1689static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1690{
1691 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1692 int i;
1693
1694 if (xp->xfrm_nr == 0)
1695 return 0;
1696
1697 for (i = 0; i < xp->xfrm_nr; i++) {
1698 struct xfrm_user_tmpl *up = &vec[i];
1699 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1700
1701 memset(up, 0, sizeof(*up));
1702 memcpy(&up->id, &kp->id, sizeof(up->id));
1703 up->family = kp->encap_family;
1704 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1705 up->reqid = kp->reqid;
1706 up->mode = kp->mode;
1707 up->share = kp->share;
1708 up->optional = kp->optional;
1709 up->aalgos = kp->aalgos;
1710 up->ealgos = kp->ealgos;
1711 up->calgos = kp->calgos;
1712 }
1713
1714 return nla_put(skb, XFRMA_TMPL,
1715 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1716}
1717
1718static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1719{
1720 if (x->security) {
1721 return copy_sec_ctx(x->security, skb);
1722 }
1723 return 0;
1724}
1725
1726static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1727{
1728 if (xp->security)
1729 return copy_sec_ctx(xp->security, skb);
1730 return 0;
1731}
1732static inline unsigned int userpolicy_type_attrsize(void)
1733{
1734#ifdef CONFIG_XFRM_SUB_POLICY
1735 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1736#else
1737 return 0;
1738#endif
1739}
1740
1741#ifdef CONFIG_XFRM_SUB_POLICY
1742static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1743{
1744 struct xfrm_userpolicy_type upt;
1745
1746 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1747 memset(&upt, 0, sizeof(upt));
1748 upt.type = type;
1749
1750 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1751}
1752
1753#else
1754static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1755{
1756 return 0;
1757}
1758#endif
1759
1760static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1761{
1762 struct xfrm_dump_info *sp = ptr;
1763 struct xfrm_userpolicy_info *p;
1764 struct sk_buff *in_skb = sp->in_skb;
1765 struct sk_buff *skb = sp->out_skb;
1766 struct nlmsghdr *nlh;
1767 int err;
1768
1769 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1770 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1771 if (nlh == NULL)
1772 return -EMSGSIZE;
1773
1774 p = nlmsg_data(nlh);
1775 copy_to_user_policy(xp, p, dir);
1776 err = copy_to_user_tmpl(xp, skb);
1777 if (!err)
1778 err = copy_to_user_sec_ctx(xp, skb);
1779 if (!err)
1780 err = copy_to_user_policy_type(xp->type, skb);
1781 if (!err)
1782 err = xfrm_mark_put(skb, &xp->mark);
1783 if (!err)
1784 err = xfrm_if_id_put(skb, xp->if_id);
1785 if (err) {
1786 nlmsg_cancel(skb, nlh);
1787 return err;
1788 }
1789 nlmsg_end(skb, nlh);
1790 return 0;
1791}
1792
1793static int xfrm_dump_policy_done(struct netlink_callback *cb)
1794{
1795 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1796 struct net *net = sock_net(cb->skb->sk);
1797
1798 xfrm_policy_walk_done(walk, net);
1799 return 0;
1800}
1801
1802static int xfrm_dump_policy_start(struct netlink_callback *cb)
1803{
1804 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1805
1806 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1807
1808 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1809 return 0;
1810}
1811
1812static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1813{
1814 struct net *net = sock_net(skb->sk);
1815 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1816 struct xfrm_dump_info info;
1817
1818 info.in_skb = cb->skb;
1819 info.out_skb = skb;
1820 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1821 info.nlmsg_flags = NLM_F_MULTI;
1822
1823 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1824
1825 return skb->len;
1826}
1827
1828static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1829 struct xfrm_policy *xp,
1830 int dir, u32 seq)
1831{
1832 struct xfrm_dump_info info;
1833 struct sk_buff *skb;
1834 int err;
1835
1836 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1837 if (!skb)
1838 return ERR_PTR(-ENOMEM);
1839
1840 info.in_skb = in_skb;
1841 info.out_skb = skb;
1842 info.nlmsg_seq = seq;
1843 info.nlmsg_flags = 0;
1844
1845 err = dump_one_policy(xp, dir, 0, &info);
1846 if (err) {
1847 kfree_skb(skb);
1848 return ERR_PTR(err);
1849 }
1850
1851 return skb;
1852}
1853
1854static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1855 struct nlattr **attrs)
1856{
1857 struct net *net = sock_net(skb->sk);
1858 struct xfrm_policy *xp;
1859 struct xfrm_userpolicy_id *p;
1860 u8 type = XFRM_POLICY_TYPE_MAIN;
1861 int err;
1862 struct km_event c;
1863 int delete;
1864 struct xfrm_mark m;
1865 u32 mark = xfrm_mark_get(attrs, &m);
1866 u32 if_id = 0;
1867
1868 p = nlmsg_data(nlh);
1869 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1870
1871 err = copy_from_user_policy_type(&type, attrs);
1872 if (err)
1873 return err;
1874
1875 err = verify_policy_dir(p->dir);
1876 if (err)
1877 return err;
1878
1879 if (attrs[XFRMA_IF_ID])
1880 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1881
1882 if (p->index)
1883 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err);
1884 else {
1885 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1886 struct xfrm_sec_ctx *ctx;
1887
1888 err = verify_sec_ctx_len(attrs);
1889 if (err)
1890 return err;
1891
1892 ctx = NULL;
1893 if (rt) {
1894 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1895
1896 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1897 if (err)
1898 return err;
1899 }
1900 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
1901 ctx, delete, &err);
1902 security_xfrm_policy_free(ctx);
1903 }
1904 if (xp == NULL)
1905 return -ENOENT;
1906
1907 if (!delete) {
1908 struct sk_buff *resp_skb;
1909
1910 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1911 if (IS_ERR(resp_skb)) {
1912 err = PTR_ERR(resp_skb);
1913 } else {
1914 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1915 NETLINK_CB(skb).portid);
1916 }
1917 } else {
1918 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1919
1920 if (err != 0)
1921 goto out;
1922
1923 c.data.byid = p->index;
1924 c.event = nlh->nlmsg_type;
1925 c.seq = nlh->nlmsg_seq;
1926 c.portid = nlh->nlmsg_pid;
1927 km_policy_notify(xp, p->dir, &c);
1928 }
1929
1930out:
1931 xfrm_pol_put(xp);
1932 return err;
1933}
1934
1935static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1936 struct nlattr **attrs)
1937{
1938 struct net *net = sock_net(skb->sk);
1939 struct km_event c;
1940 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1941 int err;
1942
1943 err = xfrm_state_flush(net, p->proto, true, false);
1944 if (err) {
1945 if (err == -ESRCH) /* empty table */
1946 return 0;
1947 return err;
1948 }
1949 c.data.proto = p->proto;
1950 c.event = nlh->nlmsg_type;
1951 c.seq = nlh->nlmsg_seq;
1952 c.portid = nlh->nlmsg_pid;
1953 c.net = net;
1954 km_state_notify(NULL, &c);
1955
1956 return 0;
1957}
1958
1959static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1960{
1961 unsigned int replay_size = x->replay_esn ?
1962 xfrm_replay_state_esn_len(x->replay_esn) :
1963 sizeof(struct xfrm_replay_state);
1964
1965 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1966 + nla_total_size(replay_size)
1967 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1968 + nla_total_size(sizeof(struct xfrm_mark))
1969 + nla_total_size(4) /* XFRM_AE_RTHR */
1970 + nla_total_size(4); /* XFRM_AE_ETHR */
1971}
1972
1973static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1974{
1975 struct xfrm_aevent_id *id;
1976 struct nlmsghdr *nlh;
1977 int err;
1978
1979 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1980 if (nlh == NULL)
1981 return -EMSGSIZE;
1982
1983 id = nlmsg_data(nlh);
1984 memset(&id->sa_id, 0, sizeof(id->sa_id));
1985 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1986 id->sa_id.spi = x->id.spi;
1987 id->sa_id.family = x->props.family;
1988 id->sa_id.proto = x->id.proto;
1989 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1990 id->reqid = x->props.reqid;
1991 id->flags = c->data.aevent;
1992
1993 if (x->replay_esn) {
1994 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1995 xfrm_replay_state_esn_len(x->replay_esn),
1996 x->replay_esn);
1997 } else {
1998 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1999 &x->replay);
2000 }
2001 if (err)
2002 goto out_cancel;
2003 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2004 XFRMA_PAD);
2005 if (err)
2006 goto out_cancel;
2007
2008 if (id->flags & XFRM_AE_RTHR) {
2009 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2010 if (err)
2011 goto out_cancel;
2012 }
2013 if (id->flags & XFRM_AE_ETHR) {
2014 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2015 x->replay_maxage * 10 / HZ);
2016 if (err)
2017 goto out_cancel;
2018 }
2019 err = xfrm_mark_put(skb, &x->mark);
2020 if (err)
2021 goto out_cancel;
2022
2023 err = xfrm_if_id_put(skb, x->if_id);
2024 if (err)
2025 goto out_cancel;
2026
2027 nlmsg_end(skb, nlh);
2028 return 0;
2029
2030out_cancel:
2031 nlmsg_cancel(skb, nlh);
2032 return err;
2033}
2034
2035static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2036 struct nlattr **attrs)
2037{
2038 struct net *net = sock_net(skb->sk);
2039 struct xfrm_state *x;
2040 struct sk_buff *r_skb;
2041 int err;
2042 struct km_event c;
2043 u32 mark;
2044 struct xfrm_mark m;
2045 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2046 struct xfrm_usersa_id *id = &p->sa_id;
2047
2048 mark = xfrm_mark_get(attrs, &m);
2049
2050 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2051 if (x == NULL)
2052 return -ESRCH;
2053
2054 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2055 if (r_skb == NULL) {
2056 xfrm_state_put(x);
2057 return -ENOMEM;
2058 }
2059
2060 /*
2061 * XXX: is this lock really needed - none of the other
2062 * gets lock (the concern is things getting updated
2063 * while we are still reading) - jhs
2064 */
2065 spin_lock_bh(&x->lock);
2066 c.data.aevent = p->flags;
2067 c.seq = nlh->nlmsg_seq;
2068 c.portid = nlh->nlmsg_pid;
2069
2070 err = build_aevent(r_skb, x, &c);
2071 BUG_ON(err < 0);
2072
2073 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2074 spin_unlock_bh(&x->lock);
2075 xfrm_state_put(x);
2076 return err;
2077}
2078
2079static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2080 struct nlattr **attrs)
2081{
2082 struct net *net = sock_net(skb->sk);
2083 struct xfrm_state *x;
2084 struct km_event c;
2085 int err = -EINVAL;
2086 u32 mark = 0;
2087 struct xfrm_mark m;
2088 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2089 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2090 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2091 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2092 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2093 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2094
2095 if (!lt && !rp && !re && !et && !rt)
2096 return err;
2097
2098 /* pedantic mode - thou shalt sayeth replaceth */
2099 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2100 return err;
2101
2102 mark = xfrm_mark_get(attrs, &m);
2103
2104 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2105 if (x == NULL)
2106 return -ESRCH;
2107
2108 if (x->km.state != XFRM_STATE_VALID)
2109 goto out;
2110
2111 err = xfrm_replay_verify_len(x->replay_esn, re);
2112 if (err)
2113 goto out;
2114
2115 spin_lock_bh(&x->lock);
2116 xfrm_update_ae_params(x, attrs, 1);
2117 spin_unlock_bh(&x->lock);
2118
2119 c.event = nlh->nlmsg_type;
2120 c.seq = nlh->nlmsg_seq;
2121 c.portid = nlh->nlmsg_pid;
2122 c.data.aevent = XFRM_AE_CU;
2123 km_state_notify(x, &c);
2124 err = 0;
2125out:
2126 xfrm_state_put(x);
2127 return err;
2128}
2129
2130static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2131 struct nlattr **attrs)
2132{
2133 struct net *net = sock_net(skb->sk);
2134 struct km_event c;
2135 u8 type = XFRM_POLICY_TYPE_MAIN;
2136 int err;
2137
2138 err = copy_from_user_policy_type(&type, attrs);
2139 if (err)
2140 return err;
2141
2142 err = xfrm_policy_flush(net, type, true);
2143 if (err) {
2144 if (err == -ESRCH) /* empty table */
2145 return 0;
2146 return err;
2147 }
2148
2149 c.data.type = type;
2150 c.event = nlh->nlmsg_type;
2151 c.seq = nlh->nlmsg_seq;
2152 c.portid = nlh->nlmsg_pid;
2153 c.net = net;
2154 km_policy_notify(NULL, 0, &c);
2155 return 0;
2156}
2157
2158static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2159 struct nlattr **attrs)
2160{
2161 struct net *net = sock_net(skb->sk);
2162 struct xfrm_policy *xp;
2163 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2164 struct xfrm_userpolicy_info *p = &up->pol;
2165 u8 type = XFRM_POLICY_TYPE_MAIN;
2166 int err = -ENOENT;
2167 struct xfrm_mark m;
2168 u32 mark = xfrm_mark_get(attrs, &m);
2169 u32 if_id = 0;
2170
2171 err = copy_from_user_policy_type(&type, attrs);
2172 if (err)
2173 return err;
2174
2175 err = verify_policy_dir(p->dir);
2176 if (err)
2177 return err;
2178
2179 if (attrs[XFRMA_IF_ID])
2180 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2181
2182 if (p->index)
2183 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err);
2184 else {
2185 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2186 struct xfrm_sec_ctx *ctx;
2187
2188 err = verify_sec_ctx_len(attrs);
2189 if (err)
2190 return err;
2191
2192 ctx = NULL;
2193 if (rt) {
2194 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2195
2196 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2197 if (err)
2198 return err;
2199 }
2200 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
2201 &p->sel, ctx, 0, &err);
2202 security_xfrm_policy_free(ctx);
2203 }
2204 if (xp == NULL)
2205 return -ENOENT;
2206
2207 if (unlikely(xp->walk.dead))
2208 goto out;
2209
2210 err = 0;
2211 if (up->hard) {
2212 xfrm_policy_delete(xp, p->dir);
2213 xfrm_audit_policy_delete(xp, 1, true);
2214 }
2215 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2216
2217out:
2218 xfrm_pol_put(xp);
2219 return err;
2220}
2221
2222static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2223 struct nlattr **attrs)
2224{
2225 struct net *net = sock_net(skb->sk);
2226 struct xfrm_state *x;
2227 int err;
2228 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2229 struct xfrm_usersa_info *p = &ue->state;
2230 struct xfrm_mark m;
2231 u32 mark = xfrm_mark_get(attrs, &m);
2232
2233 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2234
2235 err = -ENOENT;
2236 if (x == NULL)
2237 return err;
2238
2239 spin_lock_bh(&x->lock);
2240 err = -EINVAL;
2241 if (x->km.state != XFRM_STATE_VALID)
2242 goto out;
2243 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2244
2245 if (ue->hard) {
2246 __xfrm_state_delete(x);
2247 xfrm_audit_state_delete(x, 1, true);
2248 }
2249 err = 0;
2250out:
2251 spin_unlock_bh(&x->lock);
2252 xfrm_state_put(x);
2253 return err;
2254}
2255
2256static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2257 struct nlattr **attrs)
2258{
2259 struct net *net = sock_net(skb->sk);
2260 struct xfrm_policy *xp;
2261 struct xfrm_user_tmpl *ut;
2262 int i;
2263 struct nlattr *rt = attrs[XFRMA_TMPL];
2264 struct xfrm_mark mark;
2265
2266 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2267 struct xfrm_state *x = xfrm_state_alloc(net);
2268 int err = -ENOMEM;
2269
2270 if (!x)
2271 goto nomem;
2272
2273 xfrm_mark_get(attrs, &mark);
2274
2275 err = verify_newpolicy_info(&ua->policy);
2276 if (err)
2277 goto free_state;
2278
2279 /* build an XP */
2280 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2281 if (!xp)
2282 goto free_state;
2283
2284 memcpy(&x->id, &ua->id, sizeof(ua->id));
2285 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2286 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2287 xp->mark.m = x->mark.m = mark.m;
2288 xp->mark.v = x->mark.v = mark.v;
2289 ut = nla_data(rt);
2290 /* extract the templates and for each call km_key */
2291 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2292 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2293 memcpy(&x->id, &t->id, sizeof(x->id));
2294 x->props.mode = t->mode;
2295 x->props.reqid = t->reqid;
2296 x->props.family = ut->family;
2297 t->aalgos = ua->aalgos;
2298 t->ealgos = ua->ealgos;
2299 t->calgos = ua->calgos;
2300 err = km_query(x, t, xp);
2301
2302 }
2303
2304 xfrm_state_free(x);
2305 kfree(xp);
2306
2307 return 0;
2308
2309free_state:
2310 xfrm_state_free(x);
2311nomem:
2312 return err;
2313}
2314
2315#ifdef CONFIG_XFRM_MIGRATE
2316static int copy_from_user_migrate(struct xfrm_migrate *ma,
2317 struct xfrm_kmaddress *k,
2318 struct nlattr **attrs, int *num)
2319{
2320 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2321 struct xfrm_user_migrate *um;
2322 int i, num_migrate;
2323
2324 if (k != NULL) {
2325 struct xfrm_user_kmaddress *uk;
2326
2327 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2328 memcpy(&k->local, &uk->local, sizeof(k->local));
2329 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2330 k->family = uk->family;
2331 k->reserved = uk->reserved;
2332 }
2333
2334 um = nla_data(rt);
2335 num_migrate = nla_len(rt) / sizeof(*um);
2336
2337 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2338 return -EINVAL;
2339
2340 for (i = 0; i < num_migrate; i++, um++, ma++) {
2341 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2342 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2343 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2344 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2345
2346 ma->proto = um->proto;
2347 ma->mode = um->mode;
2348 ma->reqid = um->reqid;
2349
2350 ma->old_family = um->old_family;
2351 ma->new_family = um->new_family;
2352 }
2353
2354 *num = i;
2355 return 0;
2356}
2357
2358static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2359 struct nlattr **attrs)
2360{
2361 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2362 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2363 struct xfrm_kmaddress km, *kmp;
2364 u8 type;
2365 int err;
2366 int n = 0;
2367 struct net *net = sock_net(skb->sk);
2368 struct xfrm_encap_tmpl *encap = NULL;
2369
2370 if (attrs[XFRMA_MIGRATE] == NULL)
2371 return -EINVAL;
2372
2373 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2374
2375 err = copy_from_user_policy_type(&type, attrs);
2376 if (err)
2377 return err;
2378
2379 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2380 if (err)
2381 return err;
2382
2383 if (!n)
2384 return 0;
2385
2386 if (attrs[XFRMA_ENCAP]) {
2387 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2388 sizeof(*encap), GFP_KERNEL);
2389 if (!encap)
2390 return 0;
2391 }
2392
2393 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2394
2395 kfree(encap);
2396
2397 return err;
2398}
2399#else
2400static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2401 struct nlattr **attrs)
2402{
2403 return -ENOPROTOOPT;
2404}
2405#endif
2406
2407#ifdef CONFIG_XFRM_MIGRATE
2408static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2409{
2410 struct xfrm_user_migrate um;
2411
2412 memset(&um, 0, sizeof(um));
2413 um.proto = m->proto;
2414 um.mode = m->mode;
2415 um.reqid = m->reqid;
2416 um.old_family = m->old_family;
2417 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2418 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2419 um.new_family = m->new_family;
2420 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2421 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2422
2423 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2424}
2425
2426static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2427{
2428 struct xfrm_user_kmaddress uk;
2429
2430 memset(&uk, 0, sizeof(uk));
2431 uk.family = k->family;
2432 uk.reserved = k->reserved;
2433 memcpy(&uk.local, &k->local, sizeof(uk.local));
2434 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2435
2436 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2437}
2438
2439static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2440 int with_encp)
2441{
2442 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2443 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2444 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2445 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2446 + userpolicy_type_attrsize();
2447}
2448
2449static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2450 int num_migrate, const struct xfrm_kmaddress *k,
2451 const struct xfrm_selector *sel,
2452 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2453{
2454 const struct xfrm_migrate *mp;
2455 struct xfrm_userpolicy_id *pol_id;
2456 struct nlmsghdr *nlh;
2457 int i, err;
2458
2459 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2460 if (nlh == NULL)
2461 return -EMSGSIZE;
2462
2463 pol_id = nlmsg_data(nlh);
2464 /* copy data from selector, dir, and type to the pol_id */
2465 memset(pol_id, 0, sizeof(*pol_id));
2466 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2467 pol_id->dir = dir;
2468
2469 if (k != NULL) {
2470 err = copy_to_user_kmaddress(k, skb);
2471 if (err)
2472 goto out_cancel;
2473 }
2474 if (encap) {
2475 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2476 if (err)
2477 goto out_cancel;
2478 }
2479 err = copy_to_user_policy_type(type, skb);
2480 if (err)
2481 goto out_cancel;
2482 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2483 err = copy_to_user_migrate(mp, skb);
2484 if (err)
2485 goto out_cancel;
2486 }
2487
2488 nlmsg_end(skb, nlh);
2489 return 0;
2490
2491out_cancel:
2492 nlmsg_cancel(skb, nlh);
2493 return err;
2494}
2495
2496static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2497 const struct xfrm_migrate *m, int num_migrate,
2498 const struct xfrm_kmaddress *k,
2499 const struct xfrm_encap_tmpl *encap)
2500{
2501 struct net *net = &init_net;
2502 struct sk_buff *skb;
2503 int err;
2504
2505 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2506 GFP_ATOMIC);
2507 if (skb == NULL)
2508 return -ENOMEM;
2509
2510 /* build migrate */
2511 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2512 BUG_ON(err < 0);
2513
2514 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2515}
2516#else
2517static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2518 const struct xfrm_migrate *m, int num_migrate,
2519 const struct xfrm_kmaddress *k,
2520 const struct xfrm_encap_tmpl *encap)
2521{
2522 return -ENOPROTOOPT;
2523}
2524#endif
2525
2526#define XMSGSIZE(type) sizeof(struct type)
2527
2528static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2529 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2530 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2531 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2532 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2533 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2534 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2535 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2536 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2537 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2538 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2539 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2540 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2541 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2542 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2543 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2544 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2545 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2546 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2547 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2548 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2549 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2550};
2551
2552#undef XMSGSIZE
2553
2554static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2555 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2556 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2557 [XFRMA_LASTUSED] = { .type = NLA_U64},
2558 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2559 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2560 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2561 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2562 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2563 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2564 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2565 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2566 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2567 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2568 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2569 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2570 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2571 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2572 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2573 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2574 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2575 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2576 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2577 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2578 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2579 [XFRMA_PROTO] = { .type = NLA_U8 },
2580 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2581 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2582 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2583 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2584 [XFRMA_IF_ID] = { .type = NLA_U32 },
2585};
2586
2587static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2588 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2589 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2590};
2591
2592static const struct xfrm_link {
2593 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2594 int (*start)(struct netlink_callback *);
2595 int (*dump)(struct sk_buff *, struct netlink_callback *);
2596 int (*done)(struct netlink_callback *);
2597 const struct nla_policy *nla_pol;
2598 int nla_max;
2599} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2600 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2601 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2602 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2603 .dump = xfrm_dump_sa,
2604 .done = xfrm_dump_sa_done },
2605 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2606 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2607 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2608 .start = xfrm_dump_policy_start,
2609 .dump = xfrm_dump_policy,
2610 .done = xfrm_dump_policy_done },
2611 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2612 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2613 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2614 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2615 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2616 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2617 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2618 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2619 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2620 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2621 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2622 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2623 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2624 .nla_pol = xfrma_spd_policy,
2625 .nla_max = XFRMA_SPD_MAX },
2626 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2627};
2628
2629static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2630 struct netlink_ext_ack *extack)
2631{
2632 struct net *net = sock_net(skb->sk);
2633 struct nlattr *attrs[XFRMA_MAX+1];
2634 const struct xfrm_link *link;
2635 int type, err;
2636
2637 if (in_compat_syscall())
2638 return -EOPNOTSUPP;
2639
2640 type = nlh->nlmsg_type;
2641 if (type > XFRM_MSG_MAX)
2642 return -EINVAL;
2643
2644 type -= XFRM_MSG_BASE;
2645 link = &xfrm_dispatch[type];
2646
2647 /* All operations require privileges, even GET */
2648 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2649 return -EPERM;
2650
2651 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2652 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2653 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2654 if (link->dump == NULL)
2655 return -EINVAL;
2656
2657 {
2658 struct netlink_dump_control c = {
2659 .start = link->start,
2660 .dump = link->dump,
2661 .done = link->done,
2662 };
2663 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2664 }
2665 }
2666
2667 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2668 link->nla_max ? : XFRMA_MAX,
2669 link->nla_pol ? : xfrma_policy, extack);
2670 if (err < 0)
2671 return err;
2672
2673 if (link->doit == NULL)
2674 return -EINVAL;
2675
2676 return link->doit(skb, nlh, attrs);
2677}
2678
2679static void xfrm_netlink_rcv(struct sk_buff *skb)
2680{
2681 struct net *net = sock_net(skb->sk);
2682
2683 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2684 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2685 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2686}
2687
2688static inline unsigned int xfrm_expire_msgsize(void)
2689{
2690 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2691 + nla_total_size(sizeof(struct xfrm_mark));
2692}
2693
2694static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2695{
2696 struct xfrm_user_expire *ue;
2697 struct nlmsghdr *nlh;
2698 int err;
2699
2700 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2701 if (nlh == NULL)
2702 return -EMSGSIZE;
2703
2704 ue = nlmsg_data(nlh);
2705 copy_to_user_state(x, &ue->state);
2706 ue->hard = (c->data.hard != 0) ? 1 : 0;
2707 /* clear the padding bytes */
2708 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2709
2710 err = xfrm_mark_put(skb, &x->mark);
2711 if (err)
2712 return err;
2713
2714 err = xfrm_if_id_put(skb, x->if_id);
2715 if (err)
2716 return err;
2717
2718 nlmsg_end(skb, nlh);
2719 return 0;
2720}
2721
2722static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2723{
2724 struct net *net = xs_net(x);
2725 struct sk_buff *skb;
2726
2727 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2728 if (skb == NULL)
2729 return -ENOMEM;
2730
2731 if (build_expire(skb, x, c) < 0) {
2732 kfree_skb(skb);
2733 return -EMSGSIZE;
2734 }
2735
2736 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2737}
2738
2739static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2740{
2741 struct net *net = xs_net(x);
2742 struct sk_buff *skb;
2743 int err;
2744
2745 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2746 if (skb == NULL)
2747 return -ENOMEM;
2748
2749 err = build_aevent(skb, x, c);
2750 BUG_ON(err < 0);
2751
2752 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2753}
2754
2755static int xfrm_notify_sa_flush(const struct km_event *c)
2756{
2757 struct net *net = c->net;
2758 struct xfrm_usersa_flush *p;
2759 struct nlmsghdr *nlh;
2760 struct sk_buff *skb;
2761 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2762
2763 skb = nlmsg_new(len, GFP_ATOMIC);
2764 if (skb == NULL)
2765 return -ENOMEM;
2766
2767 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2768 if (nlh == NULL) {
2769 kfree_skb(skb);
2770 return -EMSGSIZE;
2771 }
2772
2773 p = nlmsg_data(nlh);
2774 p->proto = c->data.proto;
2775
2776 nlmsg_end(skb, nlh);
2777
2778 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2779}
2780
2781static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2782{
2783 unsigned int l = 0;
2784 if (x->aead)
2785 l += nla_total_size(aead_len(x->aead));
2786 if (x->aalg) {
2787 l += nla_total_size(sizeof(struct xfrm_algo) +
2788 (x->aalg->alg_key_len + 7) / 8);
2789 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2790 }
2791 if (x->ealg)
2792 l += nla_total_size(xfrm_alg_len(x->ealg));
2793 if (x->calg)
2794 l += nla_total_size(sizeof(*x->calg));
2795 if (x->encap)
2796 l += nla_total_size(sizeof(*x->encap));
2797 if (x->tfcpad)
2798 l += nla_total_size(sizeof(x->tfcpad));
2799 if (x->replay_esn)
2800 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2801 else
2802 l += nla_total_size(sizeof(struct xfrm_replay_state));
2803 if (x->security)
2804 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2805 x->security->ctx_len);
2806 if (x->coaddr)
2807 l += nla_total_size(sizeof(*x->coaddr));
2808 if (x->props.extra_flags)
2809 l += nla_total_size(sizeof(x->props.extra_flags));
2810 if (x->xso.dev)
2811 l += nla_total_size(sizeof(x->xso));
2812 if (x->props.smark.v | x->props.smark.m) {
2813 l += nla_total_size(sizeof(x->props.smark.v));
2814 l += nla_total_size(sizeof(x->props.smark.m));
2815 }
2816 if (x->if_id)
2817 l += nla_total_size(sizeof(x->if_id));
2818
2819 /* Must count x->lastused as it may become non-zero behind our back. */
2820 l += nla_total_size_64bit(sizeof(u64));
2821
2822 return l;
2823}
2824
2825static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2826{
2827 struct net *net = xs_net(x);
2828 struct xfrm_usersa_info *p;
2829 struct xfrm_usersa_id *id;
2830 struct nlmsghdr *nlh;
2831 struct sk_buff *skb;
2832 unsigned int len = xfrm_sa_len(x);
2833 unsigned int headlen;
2834 int err;
2835
2836 headlen = sizeof(*p);
2837 if (c->event == XFRM_MSG_DELSA) {
2838 len += nla_total_size(headlen);
2839 headlen = sizeof(*id);
2840 len += nla_total_size(sizeof(struct xfrm_mark));
2841 }
2842 len += NLMSG_ALIGN(headlen);
2843
2844 skb = nlmsg_new(len, GFP_ATOMIC);
2845 if (skb == NULL)
2846 return -ENOMEM;
2847
2848 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2849 err = -EMSGSIZE;
2850 if (nlh == NULL)
2851 goto out_free_skb;
2852
2853 p = nlmsg_data(nlh);
2854 if (c->event == XFRM_MSG_DELSA) {
2855 struct nlattr *attr;
2856
2857 id = nlmsg_data(nlh);
2858 memset(id, 0, sizeof(*id));
2859 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2860 id->spi = x->id.spi;
2861 id->family = x->props.family;
2862 id->proto = x->id.proto;
2863
2864 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2865 err = -EMSGSIZE;
2866 if (attr == NULL)
2867 goto out_free_skb;
2868
2869 p = nla_data(attr);
2870 }
2871 err = copy_to_user_state_extra(x, p, skb);
2872 if (err)
2873 goto out_free_skb;
2874
2875 nlmsg_end(skb, nlh);
2876
2877 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2878
2879out_free_skb:
2880 kfree_skb(skb);
2881 return err;
2882}
2883
2884static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2885{
2886
2887 switch (c->event) {
2888 case XFRM_MSG_EXPIRE:
2889 return xfrm_exp_state_notify(x, c);
2890 case XFRM_MSG_NEWAE:
2891 return xfrm_aevent_state_notify(x, c);
2892 case XFRM_MSG_DELSA:
2893 case XFRM_MSG_UPDSA:
2894 case XFRM_MSG_NEWSA:
2895 return xfrm_notify_sa(x, c);
2896 case XFRM_MSG_FLUSHSA:
2897 return xfrm_notify_sa_flush(c);
2898 default:
2899 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2900 c->event);
2901 break;
2902 }
2903
2904 return 0;
2905
2906}
2907
2908static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2909 struct xfrm_policy *xp)
2910{
2911 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2912 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2913 + nla_total_size(sizeof(struct xfrm_mark))
2914 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2915 + userpolicy_type_attrsize();
2916}
2917
2918static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2919 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2920{
2921 __u32 seq = xfrm_get_acqseq();
2922 struct xfrm_user_acquire *ua;
2923 struct nlmsghdr *nlh;
2924 int err;
2925
2926 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2927 if (nlh == NULL)
2928 return -EMSGSIZE;
2929
2930 ua = nlmsg_data(nlh);
2931 memcpy(&ua->id, &x->id, sizeof(ua->id));
2932 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2933 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2934 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2935 ua->aalgos = xt->aalgos;
2936 ua->ealgos = xt->ealgos;
2937 ua->calgos = xt->calgos;
2938 ua->seq = x->km.seq = seq;
2939
2940 err = copy_to_user_tmpl(xp, skb);
2941 if (!err)
2942 err = copy_to_user_state_sec_ctx(x, skb);
2943 if (!err)
2944 err = copy_to_user_policy_type(xp->type, skb);
2945 if (!err)
2946 err = xfrm_mark_put(skb, &xp->mark);
2947 if (!err)
2948 err = xfrm_if_id_put(skb, xp->if_id);
2949 if (err) {
2950 nlmsg_cancel(skb, nlh);
2951 return err;
2952 }
2953
2954 nlmsg_end(skb, nlh);
2955 return 0;
2956}
2957
2958static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2959 struct xfrm_policy *xp)
2960{
2961 struct net *net = xs_net(x);
2962 struct sk_buff *skb;
2963 int err;
2964
2965 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2966 if (skb == NULL)
2967 return -ENOMEM;
2968
2969 err = build_acquire(skb, x, xt, xp);
2970 BUG_ON(err < 0);
2971
2972 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2973}
2974
2975/* User gives us xfrm_user_policy_info followed by an array of 0
2976 * or more templates.
2977 */
2978static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2979 u8 *data, int len, int *dir)
2980{
2981 struct net *net = sock_net(sk);
2982 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2983 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2984 struct xfrm_policy *xp;
2985 int nr;
2986
2987 switch (sk->sk_family) {
2988 case AF_INET:
2989 if (opt != IP_XFRM_POLICY) {
2990 *dir = -EOPNOTSUPP;
2991 return NULL;
2992 }
2993 break;
2994#if IS_ENABLED(CONFIG_IPV6)
2995 case AF_INET6:
2996 if (opt != IPV6_XFRM_POLICY) {
2997 *dir = -EOPNOTSUPP;
2998 return NULL;
2999 }
3000 break;
3001#endif
3002 default:
3003 *dir = -EINVAL;
3004 return NULL;
3005 }
3006
3007 *dir = -EINVAL;
3008
3009 if (len < sizeof(*p) ||
3010 verify_newpolicy_info(p))
3011 return NULL;
3012
3013 nr = ((len - sizeof(*p)) / sizeof(*ut));
3014 if (validate_tmpl(nr, ut, p->sel.family))
3015 return NULL;
3016
3017 if (p->dir > XFRM_POLICY_OUT)
3018 return NULL;
3019
3020 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3021 if (xp == NULL) {
3022 *dir = -ENOBUFS;
3023 return NULL;
3024 }
3025
3026 copy_from_user_policy(xp, p);
3027 xp->type = XFRM_POLICY_TYPE_MAIN;
3028 copy_templates(xp, ut, nr);
3029
3030 *dir = p->dir;
3031
3032 return xp;
3033}
3034
3035static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3036{
3037 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3038 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3039 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3040 + nla_total_size(sizeof(struct xfrm_mark))
3041 + userpolicy_type_attrsize();
3042}
3043
3044static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3045 int dir, const struct km_event *c)
3046{
3047 struct xfrm_user_polexpire *upe;
3048 int hard = c->data.hard;
3049 struct nlmsghdr *nlh;
3050 int err;
3051
3052 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3053 if (nlh == NULL)
3054 return -EMSGSIZE;
3055
3056 upe = nlmsg_data(nlh);
3057 copy_to_user_policy(xp, &upe->pol, dir);
3058 err = copy_to_user_tmpl(xp, skb);
3059 if (!err)
3060 err = copy_to_user_sec_ctx(xp, skb);
3061 if (!err)
3062 err = copy_to_user_policy_type(xp->type, skb);
3063 if (!err)
3064 err = xfrm_mark_put(skb, &xp->mark);
3065 if (!err)
3066 err = xfrm_if_id_put(skb, xp->if_id);
3067 if (err) {
3068 nlmsg_cancel(skb, nlh);
3069 return err;
3070 }
3071 upe->hard = !!hard;
3072
3073 nlmsg_end(skb, nlh);
3074 return 0;
3075}
3076
3077static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3078{
3079 struct net *net = xp_net(xp);
3080 struct sk_buff *skb;
3081 int err;
3082
3083 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3084 if (skb == NULL)
3085 return -ENOMEM;
3086
3087 err = build_polexpire(skb, xp, dir, c);
3088 BUG_ON(err < 0);
3089
3090 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3091}
3092
3093static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3094{
3095 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3096 struct net *net = xp_net(xp);
3097 struct xfrm_userpolicy_info *p;
3098 struct xfrm_userpolicy_id *id;
3099 struct nlmsghdr *nlh;
3100 struct sk_buff *skb;
3101 unsigned int headlen;
3102 int err;
3103
3104 headlen = sizeof(*p);
3105 if (c->event == XFRM_MSG_DELPOLICY) {
3106 len += nla_total_size(headlen);
3107 headlen = sizeof(*id);
3108 }
3109 len += userpolicy_type_attrsize();
3110 len += nla_total_size(sizeof(struct xfrm_mark));
3111 len += NLMSG_ALIGN(headlen);
3112
3113 skb = nlmsg_new(len, GFP_ATOMIC);
3114 if (skb == NULL)
3115 return -ENOMEM;
3116
3117 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3118 err = -EMSGSIZE;
3119 if (nlh == NULL)
3120 goto out_free_skb;
3121
3122 p = nlmsg_data(nlh);
3123 if (c->event == XFRM_MSG_DELPOLICY) {
3124 struct nlattr *attr;
3125
3126 id = nlmsg_data(nlh);
3127 memset(id, 0, sizeof(*id));
3128 id->dir = dir;
3129 if (c->data.byid)
3130 id->index = xp->index;
3131 else
3132 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3133
3134 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3135 err = -EMSGSIZE;
3136 if (attr == NULL)
3137 goto out_free_skb;
3138
3139 p = nla_data(attr);
3140 }
3141
3142 copy_to_user_policy(xp, p, dir);
3143 err = copy_to_user_tmpl(xp, skb);
3144 if (!err)
3145 err = copy_to_user_policy_type(xp->type, skb);
3146 if (!err)
3147 err = xfrm_mark_put(skb, &xp->mark);
3148 if (!err)
3149 err = xfrm_if_id_put(skb, xp->if_id);
3150 if (err)
3151 goto out_free_skb;
3152
3153 nlmsg_end(skb, nlh);
3154
3155 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3156
3157out_free_skb:
3158 kfree_skb(skb);
3159 return err;
3160}
3161
3162static int xfrm_notify_policy_flush(const struct km_event *c)
3163{
3164 struct net *net = c->net;
3165 struct nlmsghdr *nlh;
3166 struct sk_buff *skb;
3167 int err;
3168
3169 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3170 if (skb == NULL)
3171 return -ENOMEM;
3172
3173 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3174 err = -EMSGSIZE;
3175 if (nlh == NULL)
3176 goto out_free_skb;
3177 err = copy_to_user_policy_type(c->data.type, skb);
3178 if (err)
3179 goto out_free_skb;
3180
3181 nlmsg_end(skb, nlh);
3182
3183 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3184
3185out_free_skb:
3186 kfree_skb(skb);
3187 return err;
3188}
3189
3190static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3191{
3192
3193 switch (c->event) {
3194 case XFRM_MSG_NEWPOLICY:
3195 case XFRM_MSG_UPDPOLICY:
3196 case XFRM_MSG_DELPOLICY:
3197 return xfrm_notify_policy(xp, dir, c);
3198 case XFRM_MSG_FLUSHPOLICY:
3199 return xfrm_notify_policy_flush(c);
3200 case XFRM_MSG_POLEXPIRE:
3201 return xfrm_exp_policy_notify(xp, dir, c);
3202 default:
3203 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3204 c->event);
3205 }
3206
3207 return 0;
3208
3209}
3210
3211static inline unsigned int xfrm_report_msgsize(void)
3212{
3213 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3214}
3215
3216static int build_report(struct sk_buff *skb, u8 proto,
3217 struct xfrm_selector *sel, xfrm_address_t *addr)
3218{
3219 struct xfrm_user_report *ur;
3220 struct nlmsghdr *nlh;
3221
3222 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3223 if (nlh == NULL)
3224 return -EMSGSIZE;
3225
3226 ur = nlmsg_data(nlh);
3227 ur->proto = proto;
3228 memcpy(&ur->sel, sel, sizeof(ur->sel));
3229
3230 if (addr) {
3231 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3232 if (err) {
3233 nlmsg_cancel(skb, nlh);
3234 return err;
3235 }
3236 }
3237 nlmsg_end(skb, nlh);
3238 return 0;
3239}
3240
3241static int xfrm_send_report(struct net *net, u8 proto,
3242 struct xfrm_selector *sel, xfrm_address_t *addr)
3243{
3244 struct sk_buff *skb;
3245 int err;
3246
3247 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3248 if (skb == NULL)
3249 return -ENOMEM;
3250
3251 err = build_report(skb, proto, sel, addr);
3252 BUG_ON(err < 0);
3253
3254 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3255}
3256
3257static inline unsigned int xfrm_mapping_msgsize(void)
3258{
3259 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3260}
3261
3262static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3263 xfrm_address_t *new_saddr, __be16 new_sport)
3264{
3265 struct xfrm_user_mapping *um;
3266 struct nlmsghdr *nlh;
3267
3268 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3269 if (nlh == NULL)
3270 return -EMSGSIZE;
3271
3272 um = nlmsg_data(nlh);
3273
3274 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3275 um->id.spi = x->id.spi;
3276 um->id.family = x->props.family;
3277 um->id.proto = x->id.proto;
3278 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3279 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3280 um->new_sport = new_sport;
3281 um->old_sport = x->encap->encap_sport;
3282 um->reqid = x->props.reqid;
3283
3284 nlmsg_end(skb, nlh);
3285 return 0;
3286}
3287
3288static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3289 __be16 sport)
3290{
3291 struct net *net = xs_net(x);
3292 struct sk_buff *skb;
3293 int err;
3294
3295 if (x->id.proto != IPPROTO_ESP)
3296 return -EINVAL;
3297
3298 if (!x->encap)
3299 return -EINVAL;
3300
3301 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3302 if (skb == NULL)
3303 return -ENOMEM;
3304
3305 err = build_mapping(skb, x, ipaddr, sport);
3306 BUG_ON(err < 0);
3307
3308 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3309}
3310
3311static bool xfrm_is_alive(const struct km_event *c)
3312{
3313 return (bool)xfrm_acquire_is_on(c->net);
3314}
3315
3316static struct xfrm_mgr netlink_mgr = {
3317 .notify = xfrm_send_state_notify,
3318 .acquire = xfrm_send_acquire,
3319 .compile_policy = xfrm_compile_policy,
3320 .notify_policy = xfrm_send_policy_notify,
3321 .report = xfrm_send_report,
3322 .migrate = xfrm_send_migrate,
3323 .new_mapping = xfrm_send_mapping,
3324 .is_alive = xfrm_is_alive,
3325};
3326
3327static int __net_init xfrm_user_net_init(struct net *net)
3328{
3329 struct sock *nlsk;
3330 struct netlink_kernel_cfg cfg = {
3331 .groups = XFRMNLGRP_MAX,
3332 .input = xfrm_netlink_rcv,
3333 };
3334
3335 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3336 if (nlsk == NULL)
3337 return -ENOMEM;
3338 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3339 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3340 return 0;
3341}
3342
3343static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3344{
3345 struct net *net;
3346 list_for_each_entry(net, net_exit_list, exit_list)
3347 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3348 synchronize_net();
3349 list_for_each_entry(net, net_exit_list, exit_list)
3350 netlink_kernel_release(net->xfrm.nlsk_stash);
3351}
3352
3353static struct pernet_operations xfrm_user_net_ops = {
3354 .init = xfrm_user_net_init,
3355 .exit_batch = xfrm_user_net_exit,
3356};
3357
3358static int __init xfrm_user_init(void)
3359{
3360 int rv;
3361
3362 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3363
3364 rv = register_pernet_subsys(&xfrm_user_net_ops);
3365 if (rv < 0)
3366 return rv;
3367 rv = xfrm_register_km(&netlink_mgr);
3368 if (rv < 0)
3369 unregister_pernet_subsys(&xfrm_user_net_ops);
3370 return rv;
3371}
3372
3373static void __exit xfrm_user_exit(void)
3374{
3375 xfrm_unregister_km(&netlink_mgr);
3376 unregister_pernet_subsys(&xfrm_user_net_ops);
3377}
3378
3379module_init(xfrm_user_init);
3380module_exit(xfrm_user_exit);
3381MODULE_LICENSE("GPL");
3382MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13#include <linux/crypto.h>
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
28#include <net/netlink.h>
29#include <net/ah.h>
30#include <asm/uaccess.h>
31#if IS_ENABLED(CONFIG_IPV6)
32#include <linux/in6.h>
33#endif
34
35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41{
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < xfrm_alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 case XFRMA_ALG_CRYPT:
55 case XFRMA_ALG_COMP:
56 break;
57
58 default:
59 return -EINVAL;
60 }
61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 xfrm_address_t **addrp)
100{
101 struct nlattr *rt = attrs[type];
102
103 if (rt && addrp)
104 *addrp = nla_data(rt);
105}
106
107static inline int verify_sec_ctx_len(struct nlattr **attrs)
108{
109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 struct xfrm_user_sec_ctx *uctx;
111
112 if (!rt)
113 return 0;
114
115 uctx = nla_data(rt);
116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 return -EINVAL;
118
119 return 0;
120}
121
122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
130 if (!rt)
131 return 0;
132
133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140}
141
142static int verify_newsa_info(struct xfrm_usersa_info *p,
143 struct nlattr **attrs)
144{
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
153#if IS_ENABLED(CONFIG_IPV6)
154 break;
155#else
156 err = -EAFNOSUPPORT;
157 goto out;
158#endif
159
160 default:
161 goto out;
162 }
163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
169 attrs[XFRMA_ALG_AEAD] ||
170 attrs[XFRMA_ALG_CRYPT] ||
171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
173 goto out;
174 break;
175
176 case IPPROTO_ESP:
177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
188 goto out;
189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
192 break;
193
194 case IPPROTO_COMP:
195 if (!attrs[XFRMA_ALG_COMP] ||
196 attrs[XFRMA_ALG_AEAD] ||
197 attrs[XFRMA_ALG_AUTH] ||
198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
201 goto out;
202 break;
203
204#if IS_ENABLED(CONFIG_IPV6)
205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
210 attrs[XFRMA_ALG_AEAD] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
214 attrs[XFRMA_TFCPAD] ||
215 !attrs[XFRMA_COADDR])
216 goto out;
217 break;
218#endif
219
220 default:
221 goto out;
222 }
223
224 if ((err = verify_aead(attrs)))
225 goto out;
226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
229 goto out;
230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
231 goto out;
232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
233 goto out;
234 if ((err = verify_sec_ctx_len(attrs)))
235 goto out;
236 if ((err = verify_replay(p, attrs)))
237 goto out;
238
239 err = -EINVAL;
240 switch (p->mode) {
241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
243 case XFRM_MODE_ROUTEOPTIMIZATION:
244 case XFRM_MODE_BEET:
245 break;
246
247 default:
248 goto out;
249 }
250
251 err = 0;
252
253out:
254 return err;
255}
256
257static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
259 struct nlattr *rta)
260{
261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
267 ualg = nla_data(rta);
268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
275 if (!p)
276 return -ENOMEM;
277
278 strcpy(p->alg_name, algo->name);
279 *algpp = p;
280 return 0;
281}
282
283static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285{
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311}
312
313static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315{
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342}
343
344static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346{
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367}
368
369static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371{
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384}
385
386static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389{
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411}
412
413static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
414{
415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422}
423
424static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425{
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
434 x->props.flags = p->flags;
435
436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
437 x->sel.family = p->family;
438}
439
440/*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444*/
445static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
446{
447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
452
453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
462 if (rp) {
463 struct xfrm_replay_state *replay;
464 replay = nla_data(rp);
465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
471 ltime = nla_data(lt);
472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
478 if (et)
479 x->replay_maxage = nla_get_u32(et);
480
481 if (rt)
482 x->replay_maxdiff = nla_get_u32(rt);
483}
484
485static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
487 struct nlattr **attrs,
488 int *errp)
489{
490 struct xfrm_state *x = xfrm_state_alloc(net);
491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
503 goto error;
504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
511 attrs[XFRMA_ALG_CRYPT])))
512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
515 attrs[XFRMA_ALG_COMP])))
516 goto error;
517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
535 xfrm_mark_get(attrs, &x->mark);
536
537 err = __xfrm_init_state(x, false);
538 if (err)
539 goto error;
540
541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
543 goto error;
544
545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
549 x->km.seq = p->seq;
550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
551 /* sysctl_xfrm_aevent_etime is in 100ms units */
552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
553
554 if ((err = xfrm_init_replay(x)))
555 goto error;
556
557 /* override default values from above */
558 xfrm_update_ae_params(x, attrs);
559
560 return x;
561
562error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565error_no_put:
566 *errp = err;
567 return NULL;
568}
569
570static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
571 struct nlattr **attrs)
572{
573 struct net *net = sock_net(skb->sk);
574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
575 struct xfrm_state *x;
576 int err;
577 struct km_event c;
578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
581
582 err = verify_newsa_info(p, attrs);
583 if (err)
584 return err;
585
586 x = xfrm_state_construct(net, p, attrs, &err);
587 if (!x)
588 return err;
589
590 xfrm_state_hold(x);
591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
596 security_task_getsecid(current, &sid);
597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
598
599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
601 __xfrm_state_put(x);
602 goto out;
603 }
604
605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
607 c.event = nlh->nlmsg_type;
608
609 km_state_notify(x, &c);
610out:
611 xfrm_state_put(x);
612 return err;
613}
614
615static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
617 struct nlattr **attrs,
618 int *errp)
619{
620 struct xfrm_state *x = NULL;
621 struct xfrm_mark m;
622 int err;
623 u32 mark = xfrm_mark_get(attrs, &m);
624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
628 } else {
629 xfrm_address_t *saddr = NULL;
630
631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
637 err = -ESRCH;
638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
640 p->proto, p->family);
641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647}
648
649static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
650 struct nlattr **attrs)
651{
652 struct net *net = sock_net(skb->sk);
653 struct xfrm_state *x;
654 int err = -ESRCH;
655 struct km_event c;
656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
660
661 x = xfrm_user_state_lookup(net, p, attrs, &err);
662 if (x == NULL)
663 return err;
664
665 if ((err = security_xfrm_state_delete(x)) != 0)
666 goto out;
667
668 if (xfrm_state_kern(x)) {
669 err = -EPERM;
670 goto out;
671 }
672
673 err = xfrm_state_delete(x);
674
675 if (err < 0)
676 goto out;
677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
680 c.event = nlh->nlmsg_type;
681 km_state_notify(x, &c);
682
683out:
684 security_task_getsecid(current, &sid);
685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
686 xfrm_state_put(x);
687 return err;
688}
689
690static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691{
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704}
705
706struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
711};
712
713static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714{
715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
717 int ctx_size = sizeof(*uctx) + s->ctx_len;
718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732}
733
734static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735{
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
745 strcpy(algo->alg_name, auth->alg_name);
746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750}
751
752/* Don't change this without updating xfrm_sa_len! */
753static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
756{
757 copy_to_user_state(x, p);
758
759 if (x->coaddr &&
760 nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr))
761 goto nla_put_failure;
762
763 if (x->lastused &&
764 nla_put_u64(skb, XFRMA_LASTUSED, x->lastused))
765 goto nla_put_failure;
766
767 if (x->aead &&
768 nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead))
769 goto nla_put_failure;
770
771 if (x->aalg &&
772 (copy_to_user_auth(x->aalg, skb) ||
773 nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
774 xfrm_alg_auth_len(x->aalg), x->aalg)))
775 goto nla_put_failure;
776
777 if (x->ealg &&
778 nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg))
779 goto nla_put_failure;
780
781 if (x->calg &&
782 nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg))
783 goto nla_put_failure;
784
785 if (x->encap &&
786 nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap))
787 goto nla_put_failure;
788
789 if (x->tfcpad &&
790 nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad))
791 goto nla_put_failure;
792
793 if (xfrm_mark_put(skb, &x->mark))
794 goto nla_put_failure;
795
796 if (x->replay_esn &&
797 nla_put(skb, XFRMA_REPLAY_ESN_VAL,
798 xfrm_replay_state_esn_len(x->replay_esn),
799 x->replay_esn))
800 goto nla_put_failure;
801
802 if (x->security && copy_sec_ctx(x->security, skb))
803 goto nla_put_failure;
804
805 return 0;
806
807nla_put_failure:
808 return -EMSGSIZE;
809}
810
811static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
812{
813 struct xfrm_dump_info *sp = ptr;
814 struct sk_buff *in_skb = sp->in_skb;
815 struct sk_buff *skb = sp->out_skb;
816 struct xfrm_usersa_info *p;
817 struct nlmsghdr *nlh;
818 int err;
819
820 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
821 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
822 if (nlh == NULL)
823 return -EMSGSIZE;
824
825 p = nlmsg_data(nlh);
826
827 err = copy_to_user_state_extra(x, p, skb);
828 if (err)
829 goto nla_put_failure;
830
831 nlmsg_end(skb, nlh);
832 return 0;
833
834nla_put_failure:
835 nlmsg_cancel(skb, nlh);
836 return err;
837}
838
839static int xfrm_dump_sa_done(struct netlink_callback *cb)
840{
841 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
842 xfrm_state_walk_done(walk);
843 return 0;
844}
845
846static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
847{
848 struct net *net = sock_net(skb->sk);
849 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
850 struct xfrm_dump_info info;
851
852 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
853 sizeof(cb->args) - sizeof(cb->args[0]));
854
855 info.in_skb = cb->skb;
856 info.out_skb = skb;
857 info.nlmsg_seq = cb->nlh->nlmsg_seq;
858 info.nlmsg_flags = NLM_F_MULTI;
859
860 if (!cb->args[0]) {
861 cb->args[0] = 1;
862 xfrm_state_walk_init(walk, 0);
863 }
864
865 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
866
867 return skb->len;
868}
869
870static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
871 struct xfrm_state *x, u32 seq)
872{
873 struct xfrm_dump_info info;
874 struct sk_buff *skb;
875
876 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
877 if (!skb)
878 return ERR_PTR(-ENOMEM);
879
880 info.in_skb = in_skb;
881 info.out_skb = skb;
882 info.nlmsg_seq = seq;
883 info.nlmsg_flags = 0;
884
885 if (dump_one_state(x, 0, &info)) {
886 kfree_skb(skb);
887 return NULL;
888 }
889
890 return skb;
891}
892
893static inline size_t xfrm_spdinfo_msgsize(void)
894{
895 return NLMSG_ALIGN(4)
896 + nla_total_size(sizeof(struct xfrmu_spdinfo))
897 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
898}
899
900static int build_spdinfo(struct sk_buff *skb, struct net *net,
901 u32 pid, u32 seq, u32 flags)
902{
903 struct xfrmk_spdinfo si;
904 struct xfrmu_spdinfo spc;
905 struct xfrmu_spdhinfo sph;
906 struct nlmsghdr *nlh;
907 u32 *f;
908
909 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
910 if (nlh == NULL) /* shouldn't really happen ... */
911 return -EMSGSIZE;
912
913 f = nlmsg_data(nlh);
914 *f = flags;
915 xfrm_spd_getinfo(net, &si);
916 spc.incnt = si.incnt;
917 spc.outcnt = si.outcnt;
918 spc.fwdcnt = si.fwdcnt;
919 spc.inscnt = si.inscnt;
920 spc.outscnt = si.outscnt;
921 spc.fwdscnt = si.fwdscnt;
922 sph.spdhcnt = si.spdhcnt;
923 sph.spdhmcnt = si.spdhmcnt;
924
925 if (nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc) ||
926 nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph))
927 goto nla_put_failure;
928
929 return nlmsg_end(skb, nlh);
930
931nla_put_failure:
932 nlmsg_cancel(skb, nlh);
933 return -EMSGSIZE;
934}
935
936static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
937 struct nlattr **attrs)
938{
939 struct net *net = sock_net(skb->sk);
940 struct sk_buff *r_skb;
941 u32 *flags = nlmsg_data(nlh);
942 u32 spid = NETLINK_CB(skb).pid;
943 u32 seq = nlh->nlmsg_seq;
944
945 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
946 if (r_skb == NULL)
947 return -ENOMEM;
948
949 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
950 BUG();
951
952 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
953}
954
955static inline size_t xfrm_sadinfo_msgsize(void)
956{
957 return NLMSG_ALIGN(4)
958 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
959 + nla_total_size(4); /* XFRMA_SAD_CNT */
960}
961
962static int build_sadinfo(struct sk_buff *skb, struct net *net,
963 u32 pid, u32 seq, u32 flags)
964{
965 struct xfrmk_sadinfo si;
966 struct xfrmu_sadhinfo sh;
967 struct nlmsghdr *nlh;
968 u32 *f;
969
970 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
971 if (nlh == NULL) /* shouldn't really happen ... */
972 return -EMSGSIZE;
973
974 f = nlmsg_data(nlh);
975 *f = flags;
976 xfrm_sad_getinfo(net, &si);
977
978 sh.sadhmcnt = si.sadhmcnt;
979 sh.sadhcnt = si.sadhcnt;
980
981 if (nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt) ||
982 nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh))
983 goto nla_put_failure;
984
985 return nlmsg_end(skb, nlh);
986
987nla_put_failure:
988 nlmsg_cancel(skb, nlh);
989 return -EMSGSIZE;
990}
991
992static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
993 struct nlattr **attrs)
994{
995 struct net *net = sock_net(skb->sk);
996 struct sk_buff *r_skb;
997 u32 *flags = nlmsg_data(nlh);
998 u32 spid = NETLINK_CB(skb).pid;
999 u32 seq = nlh->nlmsg_seq;
1000
1001 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1002 if (r_skb == NULL)
1003 return -ENOMEM;
1004
1005 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
1006 BUG();
1007
1008 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
1009}
1010
1011static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1012 struct nlattr **attrs)
1013{
1014 struct net *net = sock_net(skb->sk);
1015 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1016 struct xfrm_state *x;
1017 struct sk_buff *resp_skb;
1018 int err = -ESRCH;
1019
1020 x = xfrm_user_state_lookup(net, p, attrs, &err);
1021 if (x == NULL)
1022 goto out_noput;
1023
1024 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1025 if (IS_ERR(resp_skb)) {
1026 err = PTR_ERR(resp_skb);
1027 } else {
1028 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1029 }
1030 xfrm_state_put(x);
1031out_noput:
1032 return err;
1033}
1034
1035static int verify_userspi_info(struct xfrm_userspi_info *p)
1036{
1037 switch (p->info.id.proto) {
1038 case IPPROTO_AH:
1039 case IPPROTO_ESP:
1040 break;
1041
1042 case IPPROTO_COMP:
1043 /* IPCOMP spi is 16-bits. */
1044 if (p->max >= 0x10000)
1045 return -EINVAL;
1046 break;
1047
1048 default:
1049 return -EINVAL;
1050 }
1051
1052 if (p->min > p->max)
1053 return -EINVAL;
1054
1055 return 0;
1056}
1057
1058static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1059 struct nlattr **attrs)
1060{
1061 struct net *net = sock_net(skb->sk);
1062 struct xfrm_state *x;
1063 struct xfrm_userspi_info *p;
1064 struct sk_buff *resp_skb;
1065 xfrm_address_t *daddr;
1066 int family;
1067 int err;
1068 u32 mark;
1069 struct xfrm_mark m;
1070
1071 p = nlmsg_data(nlh);
1072 err = verify_userspi_info(p);
1073 if (err)
1074 goto out_noput;
1075
1076 family = p->info.family;
1077 daddr = &p->info.id.daddr;
1078
1079 x = NULL;
1080
1081 mark = xfrm_mark_get(attrs, &m);
1082 if (p->info.seq) {
1083 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1084 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1085 xfrm_state_put(x);
1086 x = NULL;
1087 }
1088 }
1089
1090 if (!x)
1091 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1092 p->info.id.proto, daddr,
1093 &p->info.saddr, 1,
1094 family);
1095 err = -ENOENT;
1096 if (x == NULL)
1097 goto out_noput;
1098
1099 err = xfrm_alloc_spi(x, p->min, p->max);
1100 if (err)
1101 goto out;
1102
1103 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1104 if (IS_ERR(resp_skb)) {
1105 err = PTR_ERR(resp_skb);
1106 goto out;
1107 }
1108
1109 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1110
1111out:
1112 xfrm_state_put(x);
1113out_noput:
1114 return err;
1115}
1116
1117static int verify_policy_dir(u8 dir)
1118{
1119 switch (dir) {
1120 case XFRM_POLICY_IN:
1121 case XFRM_POLICY_OUT:
1122 case XFRM_POLICY_FWD:
1123 break;
1124
1125 default:
1126 return -EINVAL;
1127 }
1128
1129 return 0;
1130}
1131
1132static int verify_policy_type(u8 type)
1133{
1134 switch (type) {
1135 case XFRM_POLICY_TYPE_MAIN:
1136#ifdef CONFIG_XFRM_SUB_POLICY
1137 case XFRM_POLICY_TYPE_SUB:
1138#endif
1139 break;
1140
1141 default:
1142 return -EINVAL;
1143 }
1144
1145 return 0;
1146}
1147
1148static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1149{
1150 switch (p->share) {
1151 case XFRM_SHARE_ANY:
1152 case XFRM_SHARE_SESSION:
1153 case XFRM_SHARE_USER:
1154 case XFRM_SHARE_UNIQUE:
1155 break;
1156
1157 default:
1158 return -EINVAL;
1159 }
1160
1161 switch (p->action) {
1162 case XFRM_POLICY_ALLOW:
1163 case XFRM_POLICY_BLOCK:
1164 break;
1165
1166 default:
1167 return -EINVAL;
1168 }
1169
1170 switch (p->sel.family) {
1171 case AF_INET:
1172 break;
1173
1174 case AF_INET6:
1175#if IS_ENABLED(CONFIG_IPV6)
1176 break;
1177#else
1178 return -EAFNOSUPPORT;
1179#endif
1180
1181 default:
1182 return -EINVAL;
1183 }
1184
1185 return verify_policy_dir(p->dir);
1186}
1187
1188static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1189{
1190 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1191 struct xfrm_user_sec_ctx *uctx;
1192
1193 if (!rt)
1194 return 0;
1195
1196 uctx = nla_data(rt);
1197 return security_xfrm_policy_alloc(&pol->security, uctx);
1198}
1199
1200static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1201 int nr)
1202{
1203 int i;
1204
1205 xp->xfrm_nr = nr;
1206 for (i = 0; i < nr; i++, ut++) {
1207 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1208
1209 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1210 memcpy(&t->saddr, &ut->saddr,
1211 sizeof(xfrm_address_t));
1212 t->reqid = ut->reqid;
1213 t->mode = ut->mode;
1214 t->share = ut->share;
1215 t->optional = ut->optional;
1216 t->aalgos = ut->aalgos;
1217 t->ealgos = ut->ealgos;
1218 t->calgos = ut->calgos;
1219 /* If all masks are ~0, then we allow all algorithms. */
1220 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1221 t->encap_family = ut->family;
1222 }
1223}
1224
1225static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1226{
1227 int i;
1228
1229 if (nr > XFRM_MAX_DEPTH)
1230 return -EINVAL;
1231
1232 for (i = 0; i < nr; i++) {
1233 /* We never validated the ut->family value, so many
1234 * applications simply leave it at zero. The check was
1235 * never made and ut->family was ignored because all
1236 * templates could be assumed to have the same family as
1237 * the policy itself. Now that we will have ipv4-in-ipv6
1238 * and ipv6-in-ipv4 tunnels, this is no longer true.
1239 */
1240 if (!ut[i].family)
1241 ut[i].family = family;
1242
1243 switch (ut[i].family) {
1244 case AF_INET:
1245 break;
1246#if IS_ENABLED(CONFIG_IPV6)
1247 case AF_INET6:
1248 break;
1249#endif
1250 default:
1251 return -EINVAL;
1252 }
1253 }
1254
1255 return 0;
1256}
1257
1258static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1259{
1260 struct nlattr *rt = attrs[XFRMA_TMPL];
1261
1262 if (!rt) {
1263 pol->xfrm_nr = 0;
1264 } else {
1265 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1266 int nr = nla_len(rt) / sizeof(*utmpl);
1267 int err;
1268
1269 err = validate_tmpl(nr, utmpl, pol->family);
1270 if (err)
1271 return err;
1272
1273 copy_templates(pol, utmpl, nr);
1274 }
1275 return 0;
1276}
1277
1278static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1279{
1280 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1281 struct xfrm_userpolicy_type *upt;
1282 u8 type = XFRM_POLICY_TYPE_MAIN;
1283 int err;
1284
1285 if (rt) {
1286 upt = nla_data(rt);
1287 type = upt->type;
1288 }
1289
1290 err = verify_policy_type(type);
1291 if (err)
1292 return err;
1293
1294 *tp = type;
1295 return 0;
1296}
1297
1298static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1299{
1300 xp->priority = p->priority;
1301 xp->index = p->index;
1302 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1303 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1304 xp->action = p->action;
1305 xp->flags = p->flags;
1306 xp->family = p->sel.family;
1307 /* XXX xp->share = p->share; */
1308}
1309
1310static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1311{
1312 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1313 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1314 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1315 p->priority = xp->priority;
1316 p->index = xp->index;
1317 p->sel.family = xp->family;
1318 p->dir = dir;
1319 p->action = xp->action;
1320 p->flags = xp->flags;
1321 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1322}
1323
1324static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1325{
1326 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1327 int err;
1328
1329 if (!xp) {
1330 *errp = -ENOMEM;
1331 return NULL;
1332 }
1333
1334 copy_from_user_policy(xp, p);
1335
1336 err = copy_from_user_policy_type(&xp->type, attrs);
1337 if (err)
1338 goto error;
1339
1340 if (!(err = copy_from_user_tmpl(xp, attrs)))
1341 err = copy_from_user_sec_ctx(xp, attrs);
1342 if (err)
1343 goto error;
1344
1345 xfrm_mark_get(attrs, &xp->mark);
1346
1347 return xp;
1348 error:
1349 *errp = err;
1350 xp->walk.dead = 1;
1351 xfrm_policy_destroy(xp);
1352 return NULL;
1353}
1354
1355static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1356 struct nlattr **attrs)
1357{
1358 struct net *net = sock_net(skb->sk);
1359 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1360 struct xfrm_policy *xp;
1361 struct km_event c;
1362 int err;
1363 int excl;
1364 uid_t loginuid = audit_get_loginuid(current);
1365 u32 sessionid = audit_get_sessionid(current);
1366 u32 sid;
1367
1368 err = verify_newpolicy_info(p);
1369 if (err)
1370 return err;
1371 err = verify_sec_ctx_len(attrs);
1372 if (err)
1373 return err;
1374
1375 xp = xfrm_policy_construct(net, p, attrs, &err);
1376 if (!xp)
1377 return err;
1378
1379 /* shouldn't excl be based on nlh flags??
1380 * Aha! this is anti-netlink really i.e more pfkey derived
1381 * in netlink excl is a flag and you wouldnt need
1382 * a type XFRM_MSG_UPDPOLICY - JHS */
1383 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1384 err = xfrm_policy_insert(p->dir, xp, excl);
1385 security_task_getsecid(current, &sid);
1386 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1387
1388 if (err) {
1389 security_xfrm_policy_free(xp->security);
1390 kfree(xp);
1391 return err;
1392 }
1393
1394 c.event = nlh->nlmsg_type;
1395 c.seq = nlh->nlmsg_seq;
1396 c.pid = nlh->nlmsg_pid;
1397 km_policy_notify(xp, p->dir, &c);
1398
1399 xfrm_pol_put(xp);
1400
1401 return 0;
1402}
1403
1404static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1405{
1406 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1407 int i;
1408
1409 if (xp->xfrm_nr == 0)
1410 return 0;
1411
1412 for (i = 0; i < xp->xfrm_nr; i++) {
1413 struct xfrm_user_tmpl *up = &vec[i];
1414 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1415
1416 memcpy(&up->id, &kp->id, sizeof(up->id));
1417 up->family = kp->encap_family;
1418 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1419 up->reqid = kp->reqid;
1420 up->mode = kp->mode;
1421 up->share = kp->share;
1422 up->optional = kp->optional;
1423 up->aalgos = kp->aalgos;
1424 up->ealgos = kp->ealgos;
1425 up->calgos = kp->calgos;
1426 }
1427
1428 return nla_put(skb, XFRMA_TMPL,
1429 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1430}
1431
1432static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1433{
1434 if (x->security) {
1435 return copy_sec_ctx(x->security, skb);
1436 }
1437 return 0;
1438}
1439
1440static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1441{
1442 if (xp->security) {
1443 return copy_sec_ctx(xp->security, skb);
1444 }
1445 return 0;
1446}
1447static inline size_t userpolicy_type_attrsize(void)
1448{
1449#ifdef CONFIG_XFRM_SUB_POLICY
1450 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1451#else
1452 return 0;
1453#endif
1454}
1455
1456#ifdef CONFIG_XFRM_SUB_POLICY
1457static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1458{
1459 struct xfrm_userpolicy_type upt = {
1460 .type = type,
1461 };
1462
1463 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1464}
1465
1466#else
1467static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1468{
1469 return 0;
1470}
1471#endif
1472
1473static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1474{
1475 struct xfrm_dump_info *sp = ptr;
1476 struct xfrm_userpolicy_info *p;
1477 struct sk_buff *in_skb = sp->in_skb;
1478 struct sk_buff *skb = sp->out_skb;
1479 struct nlmsghdr *nlh;
1480
1481 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1482 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1483 if (nlh == NULL)
1484 return -EMSGSIZE;
1485
1486 p = nlmsg_data(nlh);
1487 copy_to_user_policy(xp, p, dir);
1488 if (copy_to_user_tmpl(xp, skb) < 0)
1489 goto nlmsg_failure;
1490 if (copy_to_user_sec_ctx(xp, skb))
1491 goto nlmsg_failure;
1492 if (copy_to_user_policy_type(xp->type, skb) < 0)
1493 goto nlmsg_failure;
1494 if (xfrm_mark_put(skb, &xp->mark))
1495 goto nla_put_failure;
1496
1497 nlmsg_end(skb, nlh);
1498 return 0;
1499
1500nla_put_failure:
1501nlmsg_failure:
1502 nlmsg_cancel(skb, nlh);
1503 return -EMSGSIZE;
1504}
1505
1506static int xfrm_dump_policy_done(struct netlink_callback *cb)
1507{
1508 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1509
1510 xfrm_policy_walk_done(walk);
1511 return 0;
1512}
1513
1514static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1515{
1516 struct net *net = sock_net(skb->sk);
1517 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1518 struct xfrm_dump_info info;
1519
1520 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1521 sizeof(cb->args) - sizeof(cb->args[0]));
1522
1523 info.in_skb = cb->skb;
1524 info.out_skb = skb;
1525 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1526 info.nlmsg_flags = NLM_F_MULTI;
1527
1528 if (!cb->args[0]) {
1529 cb->args[0] = 1;
1530 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1531 }
1532
1533 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1534
1535 return skb->len;
1536}
1537
1538static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1539 struct xfrm_policy *xp,
1540 int dir, u32 seq)
1541{
1542 struct xfrm_dump_info info;
1543 struct sk_buff *skb;
1544
1545 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1546 if (!skb)
1547 return ERR_PTR(-ENOMEM);
1548
1549 info.in_skb = in_skb;
1550 info.out_skb = skb;
1551 info.nlmsg_seq = seq;
1552 info.nlmsg_flags = 0;
1553
1554 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1555 kfree_skb(skb);
1556 return NULL;
1557 }
1558
1559 return skb;
1560}
1561
1562static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1563 struct nlattr **attrs)
1564{
1565 struct net *net = sock_net(skb->sk);
1566 struct xfrm_policy *xp;
1567 struct xfrm_userpolicy_id *p;
1568 u8 type = XFRM_POLICY_TYPE_MAIN;
1569 int err;
1570 struct km_event c;
1571 int delete;
1572 struct xfrm_mark m;
1573 u32 mark = xfrm_mark_get(attrs, &m);
1574
1575 p = nlmsg_data(nlh);
1576 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1577
1578 err = copy_from_user_policy_type(&type, attrs);
1579 if (err)
1580 return err;
1581
1582 err = verify_policy_dir(p->dir);
1583 if (err)
1584 return err;
1585
1586 if (p->index)
1587 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1588 else {
1589 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1590 struct xfrm_sec_ctx *ctx;
1591
1592 err = verify_sec_ctx_len(attrs);
1593 if (err)
1594 return err;
1595
1596 ctx = NULL;
1597 if (rt) {
1598 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1599
1600 err = security_xfrm_policy_alloc(&ctx, uctx);
1601 if (err)
1602 return err;
1603 }
1604 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1605 ctx, delete, &err);
1606 security_xfrm_policy_free(ctx);
1607 }
1608 if (xp == NULL)
1609 return -ENOENT;
1610
1611 if (!delete) {
1612 struct sk_buff *resp_skb;
1613
1614 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1615 if (IS_ERR(resp_skb)) {
1616 err = PTR_ERR(resp_skb);
1617 } else {
1618 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1619 NETLINK_CB(skb).pid);
1620 }
1621 } else {
1622 uid_t loginuid = audit_get_loginuid(current);
1623 u32 sessionid = audit_get_sessionid(current);
1624 u32 sid;
1625
1626 security_task_getsecid(current, &sid);
1627 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1628 sid);
1629
1630 if (err != 0)
1631 goto out;
1632
1633 c.data.byid = p->index;
1634 c.event = nlh->nlmsg_type;
1635 c.seq = nlh->nlmsg_seq;
1636 c.pid = nlh->nlmsg_pid;
1637 km_policy_notify(xp, p->dir, &c);
1638 }
1639
1640out:
1641 xfrm_pol_put(xp);
1642 return err;
1643}
1644
1645static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1646 struct nlattr **attrs)
1647{
1648 struct net *net = sock_net(skb->sk);
1649 struct km_event c;
1650 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1651 struct xfrm_audit audit_info;
1652 int err;
1653
1654 audit_info.loginuid = audit_get_loginuid(current);
1655 audit_info.sessionid = audit_get_sessionid(current);
1656 security_task_getsecid(current, &audit_info.secid);
1657 err = xfrm_state_flush(net, p->proto, &audit_info);
1658 if (err) {
1659 if (err == -ESRCH) /* empty table */
1660 return 0;
1661 return err;
1662 }
1663 c.data.proto = p->proto;
1664 c.event = nlh->nlmsg_type;
1665 c.seq = nlh->nlmsg_seq;
1666 c.pid = nlh->nlmsg_pid;
1667 c.net = net;
1668 km_state_notify(NULL, &c);
1669
1670 return 0;
1671}
1672
1673static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1674{
1675 size_t replay_size = x->replay_esn ?
1676 xfrm_replay_state_esn_len(x->replay_esn) :
1677 sizeof(struct xfrm_replay_state);
1678
1679 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1680 + nla_total_size(replay_size)
1681 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1682 + nla_total_size(sizeof(struct xfrm_mark))
1683 + nla_total_size(4) /* XFRM_AE_RTHR */
1684 + nla_total_size(4); /* XFRM_AE_ETHR */
1685}
1686
1687static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1688{
1689 struct xfrm_aevent_id *id;
1690 struct nlmsghdr *nlh;
1691
1692 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1693 if (nlh == NULL)
1694 return -EMSGSIZE;
1695
1696 id = nlmsg_data(nlh);
1697 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1698 id->sa_id.spi = x->id.spi;
1699 id->sa_id.family = x->props.family;
1700 id->sa_id.proto = x->id.proto;
1701 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1702 id->reqid = x->props.reqid;
1703 id->flags = c->data.aevent;
1704
1705 if (x->replay_esn) {
1706 if (nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1707 xfrm_replay_state_esn_len(x->replay_esn),
1708 x->replay_esn))
1709 goto nla_put_failure;
1710 } else {
1711 if (nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1712 &x->replay))
1713 goto nla_put_failure;
1714 }
1715 if (nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft))
1716 goto nla_put_failure;
1717
1718 if ((id->flags & XFRM_AE_RTHR) &&
1719 nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff))
1720 goto nla_put_failure;
1721
1722 if ((id->flags & XFRM_AE_ETHR) &&
1723 nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1724 x->replay_maxage * 10 / HZ))
1725 goto nla_put_failure;
1726
1727 if (xfrm_mark_put(skb, &x->mark))
1728 goto nla_put_failure;
1729
1730 return nlmsg_end(skb, nlh);
1731
1732nla_put_failure:
1733 nlmsg_cancel(skb, nlh);
1734 return -EMSGSIZE;
1735}
1736
1737static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1738 struct nlattr **attrs)
1739{
1740 struct net *net = sock_net(skb->sk);
1741 struct xfrm_state *x;
1742 struct sk_buff *r_skb;
1743 int err;
1744 struct km_event c;
1745 u32 mark;
1746 struct xfrm_mark m;
1747 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1748 struct xfrm_usersa_id *id = &p->sa_id;
1749
1750 mark = xfrm_mark_get(attrs, &m);
1751
1752 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1753 if (x == NULL)
1754 return -ESRCH;
1755
1756 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1757 if (r_skb == NULL) {
1758 xfrm_state_put(x);
1759 return -ENOMEM;
1760 }
1761
1762 /*
1763 * XXX: is this lock really needed - none of the other
1764 * gets lock (the concern is things getting updated
1765 * while we are still reading) - jhs
1766 */
1767 spin_lock_bh(&x->lock);
1768 c.data.aevent = p->flags;
1769 c.seq = nlh->nlmsg_seq;
1770 c.pid = nlh->nlmsg_pid;
1771
1772 if (build_aevent(r_skb, x, &c) < 0)
1773 BUG();
1774 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1775 spin_unlock_bh(&x->lock);
1776 xfrm_state_put(x);
1777 return err;
1778}
1779
1780static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1781 struct nlattr **attrs)
1782{
1783 struct net *net = sock_net(skb->sk);
1784 struct xfrm_state *x;
1785 struct km_event c;
1786 int err = - EINVAL;
1787 u32 mark = 0;
1788 struct xfrm_mark m;
1789 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1790 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1791 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1792 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1793
1794 if (!lt && !rp && !re)
1795 return err;
1796
1797 /* pedantic mode - thou shalt sayeth replaceth */
1798 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1799 return err;
1800
1801 mark = xfrm_mark_get(attrs, &m);
1802
1803 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1804 if (x == NULL)
1805 return -ESRCH;
1806
1807 if (x->km.state != XFRM_STATE_VALID)
1808 goto out;
1809
1810 err = xfrm_replay_verify_len(x->replay_esn, rp);
1811 if (err)
1812 goto out;
1813
1814 spin_lock_bh(&x->lock);
1815 xfrm_update_ae_params(x, attrs);
1816 spin_unlock_bh(&x->lock);
1817
1818 c.event = nlh->nlmsg_type;
1819 c.seq = nlh->nlmsg_seq;
1820 c.pid = nlh->nlmsg_pid;
1821 c.data.aevent = XFRM_AE_CU;
1822 km_state_notify(x, &c);
1823 err = 0;
1824out:
1825 xfrm_state_put(x);
1826 return err;
1827}
1828
1829static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 struct nlattr **attrs)
1831{
1832 struct net *net = sock_net(skb->sk);
1833 struct km_event c;
1834 u8 type = XFRM_POLICY_TYPE_MAIN;
1835 int err;
1836 struct xfrm_audit audit_info;
1837
1838 err = copy_from_user_policy_type(&type, attrs);
1839 if (err)
1840 return err;
1841
1842 audit_info.loginuid = audit_get_loginuid(current);
1843 audit_info.sessionid = audit_get_sessionid(current);
1844 security_task_getsecid(current, &audit_info.secid);
1845 err = xfrm_policy_flush(net, type, &audit_info);
1846 if (err) {
1847 if (err == -ESRCH) /* empty table */
1848 return 0;
1849 return err;
1850 }
1851
1852 c.data.type = type;
1853 c.event = nlh->nlmsg_type;
1854 c.seq = nlh->nlmsg_seq;
1855 c.pid = nlh->nlmsg_pid;
1856 c.net = net;
1857 km_policy_notify(NULL, 0, &c);
1858 return 0;
1859}
1860
1861static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1862 struct nlattr **attrs)
1863{
1864 struct net *net = sock_net(skb->sk);
1865 struct xfrm_policy *xp;
1866 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1867 struct xfrm_userpolicy_info *p = &up->pol;
1868 u8 type = XFRM_POLICY_TYPE_MAIN;
1869 int err = -ENOENT;
1870 struct xfrm_mark m;
1871 u32 mark = xfrm_mark_get(attrs, &m);
1872
1873 err = copy_from_user_policy_type(&type, attrs);
1874 if (err)
1875 return err;
1876
1877 err = verify_policy_dir(p->dir);
1878 if (err)
1879 return err;
1880
1881 if (p->index)
1882 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1883 else {
1884 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1885 struct xfrm_sec_ctx *ctx;
1886
1887 err = verify_sec_ctx_len(attrs);
1888 if (err)
1889 return err;
1890
1891 ctx = NULL;
1892 if (rt) {
1893 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1894
1895 err = security_xfrm_policy_alloc(&ctx, uctx);
1896 if (err)
1897 return err;
1898 }
1899 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1900 &p->sel, ctx, 0, &err);
1901 security_xfrm_policy_free(ctx);
1902 }
1903 if (xp == NULL)
1904 return -ENOENT;
1905
1906 if (unlikely(xp->walk.dead))
1907 goto out;
1908
1909 err = 0;
1910 if (up->hard) {
1911 uid_t loginuid = audit_get_loginuid(current);
1912 u32 sessionid = audit_get_sessionid(current);
1913 u32 sid;
1914
1915 security_task_getsecid(current, &sid);
1916 xfrm_policy_delete(xp, p->dir);
1917 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1918
1919 } else {
1920 // reset the timers here?
1921 WARN(1, "Dont know what to do with soft policy expire\n");
1922 }
1923 km_policy_expired(xp, p->dir, up->hard, current->pid);
1924
1925out:
1926 xfrm_pol_put(xp);
1927 return err;
1928}
1929
1930static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1931 struct nlattr **attrs)
1932{
1933 struct net *net = sock_net(skb->sk);
1934 struct xfrm_state *x;
1935 int err;
1936 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1937 struct xfrm_usersa_info *p = &ue->state;
1938 struct xfrm_mark m;
1939 u32 mark = xfrm_mark_get(attrs, &m);
1940
1941 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1942
1943 err = -ENOENT;
1944 if (x == NULL)
1945 return err;
1946
1947 spin_lock_bh(&x->lock);
1948 err = -EINVAL;
1949 if (x->km.state != XFRM_STATE_VALID)
1950 goto out;
1951 km_state_expired(x, ue->hard, current->pid);
1952
1953 if (ue->hard) {
1954 uid_t loginuid = audit_get_loginuid(current);
1955 u32 sessionid = audit_get_sessionid(current);
1956 u32 sid;
1957
1958 security_task_getsecid(current, &sid);
1959 __xfrm_state_delete(x);
1960 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1961 }
1962 err = 0;
1963out:
1964 spin_unlock_bh(&x->lock);
1965 xfrm_state_put(x);
1966 return err;
1967}
1968
1969static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1970 struct nlattr **attrs)
1971{
1972 struct net *net = sock_net(skb->sk);
1973 struct xfrm_policy *xp;
1974 struct xfrm_user_tmpl *ut;
1975 int i;
1976 struct nlattr *rt = attrs[XFRMA_TMPL];
1977 struct xfrm_mark mark;
1978
1979 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1980 struct xfrm_state *x = xfrm_state_alloc(net);
1981 int err = -ENOMEM;
1982
1983 if (!x)
1984 goto nomem;
1985
1986 xfrm_mark_get(attrs, &mark);
1987
1988 err = verify_newpolicy_info(&ua->policy);
1989 if (err)
1990 goto bad_policy;
1991
1992 /* build an XP */
1993 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1994 if (!xp)
1995 goto free_state;
1996
1997 memcpy(&x->id, &ua->id, sizeof(ua->id));
1998 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1999 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2000 xp->mark.m = x->mark.m = mark.m;
2001 xp->mark.v = x->mark.v = mark.v;
2002 ut = nla_data(rt);
2003 /* extract the templates and for each call km_key */
2004 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2005 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2006 memcpy(&x->id, &t->id, sizeof(x->id));
2007 x->props.mode = t->mode;
2008 x->props.reqid = t->reqid;
2009 x->props.family = ut->family;
2010 t->aalgos = ua->aalgos;
2011 t->ealgos = ua->ealgos;
2012 t->calgos = ua->calgos;
2013 err = km_query(x, t, xp);
2014
2015 }
2016
2017 kfree(x);
2018 kfree(xp);
2019
2020 return 0;
2021
2022bad_policy:
2023 WARN(1, "BAD policy passed\n");
2024free_state:
2025 kfree(x);
2026nomem:
2027 return err;
2028}
2029
2030#ifdef CONFIG_XFRM_MIGRATE
2031static int copy_from_user_migrate(struct xfrm_migrate *ma,
2032 struct xfrm_kmaddress *k,
2033 struct nlattr **attrs, int *num)
2034{
2035 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2036 struct xfrm_user_migrate *um;
2037 int i, num_migrate;
2038
2039 if (k != NULL) {
2040 struct xfrm_user_kmaddress *uk;
2041
2042 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2043 memcpy(&k->local, &uk->local, sizeof(k->local));
2044 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2045 k->family = uk->family;
2046 k->reserved = uk->reserved;
2047 }
2048
2049 um = nla_data(rt);
2050 num_migrate = nla_len(rt) / sizeof(*um);
2051
2052 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2053 return -EINVAL;
2054
2055 for (i = 0; i < num_migrate; i++, um++, ma++) {
2056 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2057 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2058 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2059 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2060
2061 ma->proto = um->proto;
2062 ma->mode = um->mode;
2063 ma->reqid = um->reqid;
2064
2065 ma->old_family = um->old_family;
2066 ma->new_family = um->new_family;
2067 }
2068
2069 *num = i;
2070 return 0;
2071}
2072
2073static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2074 struct nlattr **attrs)
2075{
2076 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2077 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2078 struct xfrm_kmaddress km, *kmp;
2079 u8 type;
2080 int err;
2081 int n = 0;
2082
2083 if (attrs[XFRMA_MIGRATE] == NULL)
2084 return -EINVAL;
2085
2086 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2087
2088 err = copy_from_user_policy_type(&type, attrs);
2089 if (err)
2090 return err;
2091
2092 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2093 if (err)
2094 return err;
2095
2096 if (!n)
2097 return 0;
2098
2099 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2100
2101 return 0;
2102}
2103#else
2104static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2105 struct nlattr **attrs)
2106{
2107 return -ENOPROTOOPT;
2108}
2109#endif
2110
2111#ifdef CONFIG_XFRM_MIGRATE
2112static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2113{
2114 struct xfrm_user_migrate um;
2115
2116 memset(&um, 0, sizeof(um));
2117 um.proto = m->proto;
2118 um.mode = m->mode;
2119 um.reqid = m->reqid;
2120 um.old_family = m->old_family;
2121 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2122 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2123 um.new_family = m->new_family;
2124 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2125 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2126
2127 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2128}
2129
2130static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2131{
2132 struct xfrm_user_kmaddress uk;
2133
2134 memset(&uk, 0, sizeof(uk));
2135 uk.family = k->family;
2136 uk.reserved = k->reserved;
2137 memcpy(&uk.local, &k->local, sizeof(uk.local));
2138 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2139
2140 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2141}
2142
2143static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2144{
2145 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2146 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2147 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2148 + userpolicy_type_attrsize();
2149}
2150
2151static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2152 int num_migrate, const struct xfrm_kmaddress *k,
2153 const struct xfrm_selector *sel, u8 dir, u8 type)
2154{
2155 const struct xfrm_migrate *mp;
2156 struct xfrm_userpolicy_id *pol_id;
2157 struct nlmsghdr *nlh;
2158 int i;
2159
2160 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2161 if (nlh == NULL)
2162 return -EMSGSIZE;
2163
2164 pol_id = nlmsg_data(nlh);
2165 /* copy data from selector, dir, and type to the pol_id */
2166 memset(pol_id, 0, sizeof(*pol_id));
2167 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2168 pol_id->dir = dir;
2169
2170 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2171 goto nlmsg_failure;
2172
2173 if (copy_to_user_policy_type(type, skb) < 0)
2174 goto nlmsg_failure;
2175
2176 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2177 if (copy_to_user_migrate(mp, skb) < 0)
2178 goto nlmsg_failure;
2179 }
2180
2181 return nlmsg_end(skb, nlh);
2182nlmsg_failure:
2183 nlmsg_cancel(skb, nlh);
2184 return -EMSGSIZE;
2185}
2186
2187static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2188 const struct xfrm_migrate *m, int num_migrate,
2189 const struct xfrm_kmaddress *k)
2190{
2191 struct net *net = &init_net;
2192 struct sk_buff *skb;
2193
2194 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2195 if (skb == NULL)
2196 return -ENOMEM;
2197
2198 /* build migrate */
2199 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2200 BUG();
2201
2202 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2203}
2204#else
2205static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2206 const struct xfrm_migrate *m, int num_migrate,
2207 const struct xfrm_kmaddress *k)
2208{
2209 return -ENOPROTOOPT;
2210}
2211#endif
2212
2213#define XMSGSIZE(type) sizeof(struct type)
2214
2215static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2216 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2217 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2218 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2219 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2220 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2221 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2222 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2223 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2224 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2225 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2226 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2227 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2228 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2229 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2230 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2231 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2232 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2233 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2234 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2235 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2236};
2237
2238#undef XMSGSIZE
2239
2240static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2241 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2242 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2243 [XFRMA_LASTUSED] = { .type = NLA_U64},
2244 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2245 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2246 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2247 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2248 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2249 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2250 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2251 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2252 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2253 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2254 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2255 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2256 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2257 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2258 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2259 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2260 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2261 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2262 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2263 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2264};
2265
2266static struct xfrm_link {
2267 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2268 int (*dump)(struct sk_buff *, struct netlink_callback *);
2269 int (*done)(struct netlink_callback *);
2270} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2271 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2272 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2273 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2274 .dump = xfrm_dump_sa,
2275 .done = xfrm_dump_sa_done },
2276 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2277 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2278 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2279 .dump = xfrm_dump_policy,
2280 .done = xfrm_dump_policy_done },
2281 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2282 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2283 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2284 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2285 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2286 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2287 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2288 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2289 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2290 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2291 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2292 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2293 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2294};
2295
2296static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2297{
2298 struct net *net = sock_net(skb->sk);
2299 struct nlattr *attrs[XFRMA_MAX+1];
2300 struct xfrm_link *link;
2301 int type, err;
2302
2303 type = nlh->nlmsg_type;
2304 if (type > XFRM_MSG_MAX)
2305 return -EINVAL;
2306
2307 type -= XFRM_MSG_BASE;
2308 link = &xfrm_dispatch[type];
2309
2310 /* All operations require privileges, even GET */
2311 if (!capable(CAP_NET_ADMIN))
2312 return -EPERM;
2313
2314 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2315 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2316 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2317 if (link->dump == NULL)
2318 return -EINVAL;
2319
2320 {
2321 struct netlink_dump_control c = {
2322 .dump = link->dump,
2323 .done = link->done,
2324 };
2325 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2326 }
2327 }
2328
2329 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2330 xfrma_policy);
2331 if (err < 0)
2332 return err;
2333
2334 if (link->doit == NULL)
2335 return -EINVAL;
2336
2337 return link->doit(skb, nlh, attrs);
2338}
2339
2340static void xfrm_netlink_rcv(struct sk_buff *skb)
2341{
2342 mutex_lock(&xfrm_cfg_mutex);
2343 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2344 mutex_unlock(&xfrm_cfg_mutex);
2345}
2346
2347static inline size_t xfrm_expire_msgsize(void)
2348{
2349 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2350 + nla_total_size(sizeof(struct xfrm_mark));
2351}
2352
2353static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2354{
2355 struct xfrm_user_expire *ue;
2356 struct nlmsghdr *nlh;
2357
2358 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2359 if (nlh == NULL)
2360 return -EMSGSIZE;
2361
2362 ue = nlmsg_data(nlh);
2363 copy_to_user_state(x, &ue->state);
2364 ue->hard = (c->data.hard != 0) ? 1 : 0;
2365
2366 if (xfrm_mark_put(skb, &x->mark))
2367 goto nla_put_failure;
2368
2369 return nlmsg_end(skb, nlh);
2370
2371nla_put_failure:
2372 return -EMSGSIZE;
2373}
2374
2375static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2376{
2377 struct net *net = xs_net(x);
2378 struct sk_buff *skb;
2379
2380 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2381 if (skb == NULL)
2382 return -ENOMEM;
2383
2384 if (build_expire(skb, x, c) < 0) {
2385 kfree_skb(skb);
2386 return -EMSGSIZE;
2387 }
2388
2389 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2390}
2391
2392static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2393{
2394 struct net *net = xs_net(x);
2395 struct sk_buff *skb;
2396
2397 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2398 if (skb == NULL)
2399 return -ENOMEM;
2400
2401 if (build_aevent(skb, x, c) < 0)
2402 BUG();
2403
2404 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2405}
2406
2407static int xfrm_notify_sa_flush(const struct km_event *c)
2408{
2409 struct net *net = c->net;
2410 struct xfrm_usersa_flush *p;
2411 struct nlmsghdr *nlh;
2412 struct sk_buff *skb;
2413 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2414
2415 skb = nlmsg_new(len, GFP_ATOMIC);
2416 if (skb == NULL)
2417 return -ENOMEM;
2418
2419 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2420 if (nlh == NULL) {
2421 kfree_skb(skb);
2422 return -EMSGSIZE;
2423 }
2424
2425 p = nlmsg_data(nlh);
2426 p->proto = c->data.proto;
2427
2428 nlmsg_end(skb, nlh);
2429
2430 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2431}
2432
2433static inline size_t xfrm_sa_len(struct xfrm_state *x)
2434{
2435 size_t l = 0;
2436 if (x->aead)
2437 l += nla_total_size(aead_len(x->aead));
2438 if (x->aalg) {
2439 l += nla_total_size(sizeof(struct xfrm_algo) +
2440 (x->aalg->alg_key_len + 7) / 8);
2441 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2442 }
2443 if (x->ealg)
2444 l += nla_total_size(xfrm_alg_len(x->ealg));
2445 if (x->calg)
2446 l += nla_total_size(sizeof(*x->calg));
2447 if (x->encap)
2448 l += nla_total_size(sizeof(*x->encap));
2449 if (x->tfcpad)
2450 l += nla_total_size(sizeof(x->tfcpad));
2451 if (x->replay_esn)
2452 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2453 if (x->security)
2454 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2455 x->security->ctx_len);
2456 if (x->coaddr)
2457 l += nla_total_size(sizeof(*x->coaddr));
2458
2459 /* Must count x->lastused as it may become non-zero behind our back. */
2460 l += nla_total_size(sizeof(u64));
2461
2462 return l;
2463}
2464
2465static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2466{
2467 struct net *net = xs_net(x);
2468 struct xfrm_usersa_info *p;
2469 struct xfrm_usersa_id *id;
2470 struct nlmsghdr *nlh;
2471 struct sk_buff *skb;
2472 int len = xfrm_sa_len(x);
2473 int headlen;
2474
2475 headlen = sizeof(*p);
2476 if (c->event == XFRM_MSG_DELSA) {
2477 len += nla_total_size(headlen);
2478 headlen = sizeof(*id);
2479 len += nla_total_size(sizeof(struct xfrm_mark));
2480 }
2481 len += NLMSG_ALIGN(headlen);
2482
2483 skb = nlmsg_new(len, GFP_ATOMIC);
2484 if (skb == NULL)
2485 return -ENOMEM;
2486
2487 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2488 if (nlh == NULL)
2489 goto nla_put_failure;
2490
2491 p = nlmsg_data(nlh);
2492 if (c->event == XFRM_MSG_DELSA) {
2493 struct nlattr *attr;
2494
2495 id = nlmsg_data(nlh);
2496 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2497 id->spi = x->id.spi;
2498 id->family = x->props.family;
2499 id->proto = x->id.proto;
2500
2501 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2502 if (attr == NULL)
2503 goto nla_put_failure;
2504
2505 p = nla_data(attr);
2506 }
2507
2508 if (copy_to_user_state_extra(x, p, skb))
2509 goto nla_put_failure;
2510
2511 nlmsg_end(skb, nlh);
2512
2513 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2514
2515nla_put_failure:
2516 /* Somebody screwed up with xfrm_sa_len! */
2517 WARN_ON(1);
2518 kfree_skb(skb);
2519 return -1;
2520}
2521
2522static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2523{
2524
2525 switch (c->event) {
2526 case XFRM_MSG_EXPIRE:
2527 return xfrm_exp_state_notify(x, c);
2528 case XFRM_MSG_NEWAE:
2529 return xfrm_aevent_state_notify(x, c);
2530 case XFRM_MSG_DELSA:
2531 case XFRM_MSG_UPDSA:
2532 case XFRM_MSG_NEWSA:
2533 return xfrm_notify_sa(x, c);
2534 case XFRM_MSG_FLUSHSA:
2535 return xfrm_notify_sa_flush(c);
2536 default:
2537 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2538 c->event);
2539 break;
2540 }
2541
2542 return 0;
2543
2544}
2545
2546static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2547 struct xfrm_policy *xp)
2548{
2549 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2550 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2551 + nla_total_size(sizeof(struct xfrm_mark))
2552 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2553 + userpolicy_type_attrsize();
2554}
2555
2556static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2557 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2558 int dir)
2559{
2560 struct xfrm_user_acquire *ua;
2561 struct nlmsghdr *nlh;
2562 __u32 seq = xfrm_get_acqseq();
2563
2564 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2565 if (nlh == NULL)
2566 return -EMSGSIZE;
2567
2568 ua = nlmsg_data(nlh);
2569 memcpy(&ua->id, &x->id, sizeof(ua->id));
2570 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2571 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2572 copy_to_user_policy(xp, &ua->policy, dir);
2573 ua->aalgos = xt->aalgos;
2574 ua->ealgos = xt->ealgos;
2575 ua->calgos = xt->calgos;
2576 ua->seq = x->km.seq = seq;
2577
2578 if (copy_to_user_tmpl(xp, skb) < 0)
2579 goto nlmsg_failure;
2580 if (copy_to_user_state_sec_ctx(x, skb))
2581 goto nlmsg_failure;
2582 if (copy_to_user_policy_type(xp->type, skb) < 0)
2583 goto nlmsg_failure;
2584 if (xfrm_mark_put(skb, &xp->mark))
2585 goto nla_put_failure;
2586
2587 return nlmsg_end(skb, nlh);
2588
2589nla_put_failure:
2590nlmsg_failure:
2591 nlmsg_cancel(skb, nlh);
2592 return -EMSGSIZE;
2593}
2594
2595static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2596 struct xfrm_policy *xp, int dir)
2597{
2598 struct net *net = xs_net(x);
2599 struct sk_buff *skb;
2600
2601 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2602 if (skb == NULL)
2603 return -ENOMEM;
2604
2605 if (build_acquire(skb, x, xt, xp, dir) < 0)
2606 BUG();
2607
2608 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2609}
2610
2611/* User gives us xfrm_user_policy_info followed by an array of 0
2612 * or more templates.
2613 */
2614static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2615 u8 *data, int len, int *dir)
2616{
2617 struct net *net = sock_net(sk);
2618 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2619 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2620 struct xfrm_policy *xp;
2621 int nr;
2622
2623 switch (sk->sk_family) {
2624 case AF_INET:
2625 if (opt != IP_XFRM_POLICY) {
2626 *dir = -EOPNOTSUPP;
2627 return NULL;
2628 }
2629 break;
2630#if IS_ENABLED(CONFIG_IPV6)
2631 case AF_INET6:
2632 if (opt != IPV6_XFRM_POLICY) {
2633 *dir = -EOPNOTSUPP;
2634 return NULL;
2635 }
2636 break;
2637#endif
2638 default:
2639 *dir = -EINVAL;
2640 return NULL;
2641 }
2642
2643 *dir = -EINVAL;
2644
2645 if (len < sizeof(*p) ||
2646 verify_newpolicy_info(p))
2647 return NULL;
2648
2649 nr = ((len - sizeof(*p)) / sizeof(*ut));
2650 if (validate_tmpl(nr, ut, p->sel.family))
2651 return NULL;
2652
2653 if (p->dir > XFRM_POLICY_OUT)
2654 return NULL;
2655
2656 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2657 if (xp == NULL) {
2658 *dir = -ENOBUFS;
2659 return NULL;
2660 }
2661
2662 copy_from_user_policy(xp, p);
2663 xp->type = XFRM_POLICY_TYPE_MAIN;
2664 copy_templates(xp, ut, nr);
2665
2666 *dir = p->dir;
2667
2668 return xp;
2669}
2670
2671static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2672{
2673 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2674 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2675 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2676 + nla_total_size(sizeof(struct xfrm_mark))
2677 + userpolicy_type_attrsize();
2678}
2679
2680static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2681 int dir, const struct km_event *c)
2682{
2683 struct xfrm_user_polexpire *upe;
2684 struct nlmsghdr *nlh;
2685 int hard = c->data.hard;
2686
2687 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2688 if (nlh == NULL)
2689 return -EMSGSIZE;
2690
2691 upe = nlmsg_data(nlh);
2692 copy_to_user_policy(xp, &upe->pol, dir);
2693 if (copy_to_user_tmpl(xp, skb) < 0)
2694 goto nlmsg_failure;
2695 if (copy_to_user_sec_ctx(xp, skb))
2696 goto nlmsg_failure;
2697 if (copy_to_user_policy_type(xp->type, skb) < 0)
2698 goto nlmsg_failure;
2699 if (xfrm_mark_put(skb, &xp->mark))
2700 goto nla_put_failure;
2701 upe->hard = !!hard;
2702
2703 return nlmsg_end(skb, nlh);
2704
2705nla_put_failure:
2706nlmsg_failure:
2707 nlmsg_cancel(skb, nlh);
2708 return -EMSGSIZE;
2709}
2710
2711static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2712{
2713 struct net *net = xp_net(xp);
2714 struct sk_buff *skb;
2715
2716 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2717 if (skb == NULL)
2718 return -ENOMEM;
2719
2720 if (build_polexpire(skb, xp, dir, c) < 0)
2721 BUG();
2722
2723 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2724}
2725
2726static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2727{
2728 struct net *net = xp_net(xp);
2729 struct xfrm_userpolicy_info *p;
2730 struct xfrm_userpolicy_id *id;
2731 struct nlmsghdr *nlh;
2732 struct sk_buff *skb;
2733 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2734 int headlen;
2735
2736 headlen = sizeof(*p);
2737 if (c->event == XFRM_MSG_DELPOLICY) {
2738 len += nla_total_size(headlen);
2739 headlen = sizeof(*id);
2740 }
2741 len += userpolicy_type_attrsize();
2742 len += nla_total_size(sizeof(struct xfrm_mark));
2743 len += NLMSG_ALIGN(headlen);
2744
2745 skb = nlmsg_new(len, GFP_ATOMIC);
2746 if (skb == NULL)
2747 return -ENOMEM;
2748
2749 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2750 if (nlh == NULL)
2751 goto nlmsg_failure;
2752
2753 p = nlmsg_data(nlh);
2754 if (c->event == XFRM_MSG_DELPOLICY) {
2755 struct nlattr *attr;
2756
2757 id = nlmsg_data(nlh);
2758 memset(id, 0, sizeof(*id));
2759 id->dir = dir;
2760 if (c->data.byid)
2761 id->index = xp->index;
2762 else
2763 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2764
2765 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2766 if (attr == NULL)
2767 goto nlmsg_failure;
2768
2769 p = nla_data(attr);
2770 }
2771
2772 copy_to_user_policy(xp, p, dir);
2773 if (copy_to_user_tmpl(xp, skb) < 0)
2774 goto nlmsg_failure;
2775 if (copy_to_user_policy_type(xp->type, skb) < 0)
2776 goto nlmsg_failure;
2777
2778 if (xfrm_mark_put(skb, &xp->mark))
2779 goto nla_put_failure;
2780
2781 nlmsg_end(skb, nlh);
2782
2783 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2784
2785nla_put_failure:
2786nlmsg_failure:
2787 kfree_skb(skb);
2788 return -1;
2789}
2790
2791static int xfrm_notify_policy_flush(const struct km_event *c)
2792{
2793 struct net *net = c->net;
2794 struct nlmsghdr *nlh;
2795 struct sk_buff *skb;
2796
2797 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2798 if (skb == NULL)
2799 return -ENOMEM;
2800
2801 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2802 if (nlh == NULL)
2803 goto nlmsg_failure;
2804 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2805 goto nlmsg_failure;
2806
2807 nlmsg_end(skb, nlh);
2808
2809 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2810
2811nlmsg_failure:
2812 kfree_skb(skb);
2813 return -1;
2814}
2815
2816static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2817{
2818
2819 switch (c->event) {
2820 case XFRM_MSG_NEWPOLICY:
2821 case XFRM_MSG_UPDPOLICY:
2822 case XFRM_MSG_DELPOLICY:
2823 return xfrm_notify_policy(xp, dir, c);
2824 case XFRM_MSG_FLUSHPOLICY:
2825 return xfrm_notify_policy_flush(c);
2826 case XFRM_MSG_POLEXPIRE:
2827 return xfrm_exp_policy_notify(xp, dir, c);
2828 default:
2829 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2830 c->event);
2831 }
2832
2833 return 0;
2834
2835}
2836
2837static inline size_t xfrm_report_msgsize(void)
2838{
2839 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2840}
2841
2842static int build_report(struct sk_buff *skb, u8 proto,
2843 struct xfrm_selector *sel, xfrm_address_t *addr)
2844{
2845 struct xfrm_user_report *ur;
2846 struct nlmsghdr *nlh;
2847
2848 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2849 if (nlh == NULL)
2850 return -EMSGSIZE;
2851
2852 ur = nlmsg_data(nlh);
2853 ur->proto = proto;
2854 memcpy(&ur->sel, sel, sizeof(ur->sel));
2855
2856 if (addr &&
2857 nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr))
2858 goto nla_put_failure;
2859
2860 return nlmsg_end(skb, nlh);
2861
2862nla_put_failure:
2863 nlmsg_cancel(skb, nlh);
2864 return -EMSGSIZE;
2865}
2866
2867static int xfrm_send_report(struct net *net, u8 proto,
2868 struct xfrm_selector *sel, xfrm_address_t *addr)
2869{
2870 struct sk_buff *skb;
2871
2872 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2873 if (skb == NULL)
2874 return -ENOMEM;
2875
2876 if (build_report(skb, proto, sel, addr) < 0)
2877 BUG();
2878
2879 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2880}
2881
2882static inline size_t xfrm_mapping_msgsize(void)
2883{
2884 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2885}
2886
2887static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2888 xfrm_address_t *new_saddr, __be16 new_sport)
2889{
2890 struct xfrm_user_mapping *um;
2891 struct nlmsghdr *nlh;
2892
2893 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2894 if (nlh == NULL)
2895 return -EMSGSIZE;
2896
2897 um = nlmsg_data(nlh);
2898
2899 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2900 um->id.spi = x->id.spi;
2901 um->id.family = x->props.family;
2902 um->id.proto = x->id.proto;
2903 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2904 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2905 um->new_sport = new_sport;
2906 um->old_sport = x->encap->encap_sport;
2907 um->reqid = x->props.reqid;
2908
2909 return nlmsg_end(skb, nlh);
2910}
2911
2912static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2913 __be16 sport)
2914{
2915 struct net *net = xs_net(x);
2916 struct sk_buff *skb;
2917
2918 if (x->id.proto != IPPROTO_ESP)
2919 return -EINVAL;
2920
2921 if (!x->encap)
2922 return -EINVAL;
2923
2924 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2925 if (skb == NULL)
2926 return -ENOMEM;
2927
2928 if (build_mapping(skb, x, ipaddr, sport) < 0)
2929 BUG();
2930
2931 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2932}
2933
2934static struct xfrm_mgr netlink_mgr = {
2935 .id = "netlink",
2936 .notify = xfrm_send_state_notify,
2937 .acquire = xfrm_send_acquire,
2938 .compile_policy = xfrm_compile_policy,
2939 .notify_policy = xfrm_send_policy_notify,
2940 .report = xfrm_send_report,
2941 .migrate = xfrm_send_migrate,
2942 .new_mapping = xfrm_send_mapping,
2943};
2944
2945static int __net_init xfrm_user_net_init(struct net *net)
2946{
2947 struct sock *nlsk;
2948
2949 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2950 xfrm_netlink_rcv, NULL, THIS_MODULE);
2951 if (nlsk == NULL)
2952 return -ENOMEM;
2953 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2954 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2955 return 0;
2956}
2957
2958static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2959{
2960 struct net *net;
2961 list_for_each_entry(net, net_exit_list, exit_list)
2962 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2963 synchronize_net();
2964 list_for_each_entry(net, net_exit_list, exit_list)
2965 netlink_kernel_release(net->xfrm.nlsk_stash);
2966}
2967
2968static struct pernet_operations xfrm_user_net_ops = {
2969 .init = xfrm_user_net_init,
2970 .exit_batch = xfrm_user_net_exit,
2971};
2972
2973static int __init xfrm_user_init(void)
2974{
2975 int rv;
2976
2977 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2978
2979 rv = register_pernet_subsys(&xfrm_user_net_ops);
2980 if (rv < 0)
2981 return rv;
2982 rv = xfrm_register_km(&netlink_mgr);
2983 if (rv < 0)
2984 unregister_pernet_subsys(&xfrm_user_net_ops);
2985 return rv;
2986}
2987
2988static void __exit xfrm_user_exit(void)
2989{
2990 xfrm_unregister_km(&netlink_mgr);
2991 unregister_pernet_subsys(&xfrm_user_net_ops);
2992}
2993
2994module_init(xfrm_user_init);
2995module_exit(xfrm_user_exit);
2996MODULE_LICENSE("GPL");
2997MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2998