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