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drm/amdgpu: fix rb setting for CZ
[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 = kmalloc(sizeof(*filter), GFP_KERNEL);
929 if (filter == NULL)
930 return -ENOMEM;
931
932 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
933 sizeof(*filter));
934 }
935
936 if (attrs[XFRMA_PROTO])
937 proto = nla_get_u8(attrs[XFRMA_PROTO]);
938
939 xfrm_state_walk_init(walk, proto, filter);
940 }
941
942 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
943
944 return skb->len;
945 }
946
947 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
948 struct xfrm_state *x, u32 seq)
949 {
950 struct xfrm_dump_info info;
951 struct sk_buff *skb;
952 int err;
953
954 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
955 if (!skb)
956 return ERR_PTR(-ENOMEM);
957
958 info.in_skb = in_skb;
959 info.out_skb = skb;
960 info.nlmsg_seq = seq;
961 info.nlmsg_flags = 0;
962
963 err = dump_one_state(x, 0, &info);
964 if (err) {
965 kfree_skb(skb);
966 return ERR_PTR(err);
967 }
968
969 return skb;
970 }
971
972 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
973 * Must be called with RCU read lock.
974 */
975 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
976 u32 pid, unsigned int group)
977 {
978 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
979
980 if (nlsk)
981 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
982 else
983 return -1;
984 }
985
986 static inline size_t xfrm_spdinfo_msgsize(void)
987 {
988 return NLMSG_ALIGN(4)
989 + nla_total_size(sizeof(struct xfrmu_spdinfo))
990 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
991 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
992 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
993 }
994
995 static int build_spdinfo(struct sk_buff *skb, struct net *net,
996 u32 portid, u32 seq, u32 flags)
997 {
998 struct xfrmk_spdinfo si;
999 struct xfrmu_spdinfo spc;
1000 struct xfrmu_spdhinfo sph;
1001 struct xfrmu_spdhthresh spt4, spt6;
1002 struct nlmsghdr *nlh;
1003 int err;
1004 u32 *f;
1005 unsigned lseq;
1006
1007 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1008 if (nlh == NULL) /* shouldn't really happen ... */
1009 return -EMSGSIZE;
1010
1011 f = nlmsg_data(nlh);
1012 *f = flags;
1013 xfrm_spd_getinfo(net, &si);
1014 spc.incnt = si.incnt;
1015 spc.outcnt = si.outcnt;
1016 spc.fwdcnt = si.fwdcnt;
1017 spc.inscnt = si.inscnt;
1018 spc.outscnt = si.outscnt;
1019 spc.fwdscnt = si.fwdscnt;
1020 sph.spdhcnt = si.spdhcnt;
1021 sph.spdhmcnt = si.spdhmcnt;
1022
1023 do {
1024 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1025
1026 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1027 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1028 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1029 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1030 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1031
1032 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1033 if (!err)
1034 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1035 if (!err)
1036 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1037 if (!err)
1038 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1039 if (err) {
1040 nlmsg_cancel(skb, nlh);
1041 return err;
1042 }
1043
1044 nlmsg_end(skb, nlh);
1045 return 0;
1046 }
1047
1048 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1049 struct nlattr **attrs)
1050 {
1051 struct net *net = sock_net(skb->sk);
1052 struct xfrmu_spdhthresh *thresh4 = NULL;
1053 struct xfrmu_spdhthresh *thresh6 = NULL;
1054
1055 /* selector prefixlen thresholds to hash policies */
1056 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1057 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1058
1059 if (nla_len(rta) < sizeof(*thresh4))
1060 return -EINVAL;
1061 thresh4 = nla_data(rta);
1062 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1063 return -EINVAL;
1064 }
1065 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1066 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1067
1068 if (nla_len(rta) < sizeof(*thresh6))
1069 return -EINVAL;
1070 thresh6 = nla_data(rta);
1071 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1072 return -EINVAL;
1073 }
1074
1075 if (thresh4 || thresh6) {
1076 write_seqlock(&net->xfrm.policy_hthresh.lock);
1077 if (thresh4) {
1078 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1079 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1080 }
1081 if (thresh6) {
1082 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1083 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1084 }
1085 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1086
1087 xfrm_policy_hash_rebuild(net);
1088 }
1089
1090 return 0;
1091 }
1092
1093 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1094 struct nlattr **attrs)
1095 {
1096 struct net *net = sock_net(skb->sk);
1097 struct sk_buff *r_skb;
1098 u32 *flags = nlmsg_data(nlh);
1099 u32 sportid = NETLINK_CB(skb).portid;
1100 u32 seq = nlh->nlmsg_seq;
1101
1102 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1103 if (r_skb == NULL)
1104 return -ENOMEM;
1105
1106 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1107 BUG();
1108
1109 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1110 }
1111
1112 static inline size_t xfrm_sadinfo_msgsize(void)
1113 {
1114 return NLMSG_ALIGN(4)
1115 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1116 + nla_total_size(4); /* XFRMA_SAD_CNT */
1117 }
1118
1119 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1120 u32 portid, u32 seq, u32 flags)
1121 {
1122 struct xfrmk_sadinfo si;
1123 struct xfrmu_sadhinfo sh;
1124 struct nlmsghdr *nlh;
1125 int err;
1126 u32 *f;
1127
1128 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1129 if (nlh == NULL) /* shouldn't really happen ... */
1130 return -EMSGSIZE;
1131
1132 f = nlmsg_data(nlh);
1133 *f = flags;
1134 xfrm_sad_getinfo(net, &si);
1135
1136 sh.sadhmcnt = si.sadhmcnt;
1137 sh.sadhcnt = si.sadhcnt;
1138
1139 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1140 if (!err)
1141 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1142 if (err) {
1143 nlmsg_cancel(skb, nlh);
1144 return err;
1145 }
1146
1147 nlmsg_end(skb, nlh);
1148 return 0;
1149 }
1150
1151 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1152 struct nlattr **attrs)
1153 {
1154 struct net *net = sock_net(skb->sk);
1155 struct sk_buff *r_skb;
1156 u32 *flags = nlmsg_data(nlh);
1157 u32 sportid = NETLINK_CB(skb).portid;
1158 u32 seq = nlh->nlmsg_seq;
1159
1160 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1161 if (r_skb == NULL)
1162 return -ENOMEM;
1163
1164 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1165 BUG();
1166
1167 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1168 }
1169
1170 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1171 struct nlattr **attrs)
1172 {
1173 struct net *net = sock_net(skb->sk);
1174 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1175 struct xfrm_state *x;
1176 struct sk_buff *resp_skb;
1177 int err = -ESRCH;
1178
1179 x = xfrm_user_state_lookup(net, p, attrs, &err);
1180 if (x == NULL)
1181 goto out_noput;
1182
1183 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1184 if (IS_ERR(resp_skb)) {
1185 err = PTR_ERR(resp_skb);
1186 } else {
1187 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1188 }
1189 xfrm_state_put(x);
1190 out_noput:
1191 return err;
1192 }
1193
1194 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1195 struct nlattr **attrs)
1196 {
1197 struct net *net = sock_net(skb->sk);
1198 struct xfrm_state *x;
1199 struct xfrm_userspi_info *p;
1200 struct sk_buff *resp_skb;
1201 xfrm_address_t *daddr;
1202 int family;
1203 int err;
1204 u32 mark;
1205 struct xfrm_mark m;
1206
1207 p = nlmsg_data(nlh);
1208 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1209 if (err)
1210 goto out_noput;
1211
1212 family = p->info.family;
1213 daddr = &p->info.id.daddr;
1214
1215 x = NULL;
1216
1217 mark = xfrm_mark_get(attrs, &m);
1218 if (p->info.seq) {
1219 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1220 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1221 xfrm_state_put(x);
1222 x = NULL;
1223 }
1224 }
1225
1226 if (!x)
1227 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1228 p->info.id.proto, daddr,
1229 &p->info.saddr, 1,
1230 family);
1231 err = -ENOENT;
1232 if (x == NULL)
1233 goto out_noput;
1234
1235 err = xfrm_alloc_spi(x, p->min, p->max);
1236 if (err)
1237 goto out;
1238
1239 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1240 if (IS_ERR(resp_skb)) {
1241 err = PTR_ERR(resp_skb);
1242 goto out;
1243 }
1244
1245 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1246
1247 out:
1248 xfrm_state_put(x);
1249 out_noput:
1250 return err;
1251 }
1252
1253 static int verify_policy_dir(u8 dir)
1254 {
1255 switch (dir) {
1256 case XFRM_POLICY_IN:
1257 case XFRM_POLICY_OUT:
1258 case XFRM_POLICY_FWD:
1259 break;
1260
1261 default:
1262 return -EINVAL;
1263 }
1264
1265 return 0;
1266 }
1267
1268 static int verify_policy_type(u8 type)
1269 {
1270 switch (type) {
1271 case XFRM_POLICY_TYPE_MAIN:
1272 #ifdef CONFIG_XFRM_SUB_POLICY
1273 case XFRM_POLICY_TYPE_SUB:
1274 #endif
1275 break;
1276
1277 default:
1278 return -EINVAL;
1279 }
1280
1281 return 0;
1282 }
1283
1284 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1285 {
1286 int ret;
1287
1288 switch (p->share) {
1289 case XFRM_SHARE_ANY:
1290 case XFRM_SHARE_SESSION:
1291 case XFRM_SHARE_USER:
1292 case XFRM_SHARE_UNIQUE:
1293 break;
1294
1295 default:
1296 return -EINVAL;
1297 }
1298
1299 switch (p->action) {
1300 case XFRM_POLICY_ALLOW:
1301 case XFRM_POLICY_BLOCK:
1302 break;
1303
1304 default:
1305 return -EINVAL;
1306 }
1307
1308 switch (p->sel.family) {
1309 case AF_INET:
1310 break;
1311
1312 case AF_INET6:
1313 #if IS_ENABLED(CONFIG_IPV6)
1314 break;
1315 #else
1316 return -EAFNOSUPPORT;
1317 #endif
1318
1319 default:
1320 return -EINVAL;
1321 }
1322
1323 ret = verify_policy_dir(p->dir);
1324 if (ret)
1325 return ret;
1326 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1327 return -EINVAL;
1328
1329 return 0;
1330 }
1331
1332 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1333 {
1334 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1335 struct xfrm_user_sec_ctx *uctx;
1336
1337 if (!rt)
1338 return 0;
1339
1340 uctx = nla_data(rt);
1341 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1342 }
1343
1344 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1345 int nr)
1346 {
1347 int i;
1348
1349 xp->xfrm_nr = nr;
1350 for (i = 0; i < nr; i++, ut++) {
1351 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1352
1353 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1354 memcpy(&t->saddr, &ut->saddr,
1355 sizeof(xfrm_address_t));
1356 t->reqid = ut->reqid;
1357 t->mode = ut->mode;
1358 t->share = ut->share;
1359 t->optional = ut->optional;
1360 t->aalgos = ut->aalgos;
1361 t->ealgos = ut->ealgos;
1362 t->calgos = ut->calgos;
1363 /* If all masks are ~0, then we allow all algorithms. */
1364 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1365 t->encap_family = ut->family;
1366 }
1367 }
1368
1369 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1370 {
1371 int i;
1372
1373 if (nr > XFRM_MAX_DEPTH)
1374 return -EINVAL;
1375
1376 for (i = 0; i < nr; i++) {
1377 /* We never validated the ut->family value, so many
1378 * applications simply leave it at zero. The check was
1379 * never made and ut->family was ignored because all
1380 * templates could be assumed to have the same family as
1381 * the policy itself. Now that we will have ipv4-in-ipv6
1382 * and ipv6-in-ipv4 tunnels, this is no longer true.
1383 */
1384 if (!ut[i].family)
1385 ut[i].family = family;
1386
1387 switch (ut[i].family) {
1388 case AF_INET:
1389 break;
1390 #if IS_ENABLED(CONFIG_IPV6)
1391 case AF_INET6:
1392 break;
1393 #endif
1394 default:
1395 return -EINVAL;
1396 }
1397 }
1398
1399 return 0;
1400 }
1401
1402 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1403 {
1404 struct nlattr *rt = attrs[XFRMA_TMPL];
1405
1406 if (!rt) {
1407 pol->xfrm_nr = 0;
1408 } else {
1409 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1410 int nr = nla_len(rt) / sizeof(*utmpl);
1411 int err;
1412
1413 err = validate_tmpl(nr, utmpl, pol->family);
1414 if (err)
1415 return err;
1416
1417 copy_templates(pol, utmpl, nr);
1418 }
1419 return 0;
1420 }
1421
1422 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1423 {
1424 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1425 struct xfrm_userpolicy_type *upt;
1426 u8 type = XFRM_POLICY_TYPE_MAIN;
1427 int err;
1428
1429 if (rt) {
1430 upt = nla_data(rt);
1431 type = upt->type;
1432 }
1433
1434 err = verify_policy_type(type);
1435 if (err)
1436 return err;
1437
1438 *tp = type;
1439 return 0;
1440 }
1441
1442 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1443 {
1444 xp->priority = p->priority;
1445 xp->index = p->index;
1446 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1447 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1448 xp->action = p->action;
1449 xp->flags = p->flags;
1450 xp->family = p->sel.family;
1451 /* XXX xp->share = p->share; */
1452 }
1453
1454 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1455 {
1456 memset(p, 0, sizeof(*p));
1457 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1458 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1459 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1460 p->priority = xp->priority;
1461 p->index = xp->index;
1462 p->sel.family = xp->family;
1463 p->dir = dir;
1464 p->action = xp->action;
1465 p->flags = xp->flags;
1466 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1467 }
1468
1469 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1470 {
1471 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1472 int err;
1473
1474 if (!xp) {
1475 *errp = -ENOMEM;
1476 return NULL;
1477 }
1478
1479 copy_from_user_policy(xp, p);
1480
1481 err = copy_from_user_policy_type(&xp->type, attrs);
1482 if (err)
1483 goto error;
1484
1485 if (!(err = copy_from_user_tmpl(xp, attrs)))
1486 err = copy_from_user_sec_ctx(xp, attrs);
1487 if (err)
1488 goto error;
1489
1490 xfrm_mark_get(attrs, &xp->mark);
1491
1492 return xp;
1493 error:
1494 *errp = err;
1495 xp->walk.dead = 1;
1496 xfrm_policy_destroy(xp);
1497 return NULL;
1498 }
1499
1500 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1501 struct nlattr **attrs)
1502 {
1503 struct net *net = sock_net(skb->sk);
1504 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1505 struct xfrm_policy *xp;
1506 struct km_event c;
1507 int err;
1508 int excl;
1509
1510 err = verify_newpolicy_info(p);
1511 if (err)
1512 return err;
1513 err = verify_sec_ctx_len(attrs);
1514 if (err)
1515 return err;
1516
1517 xp = xfrm_policy_construct(net, p, attrs, &err);
1518 if (!xp)
1519 return err;
1520
1521 /* shouldn't excl be based on nlh flags??
1522 * Aha! this is anti-netlink really i.e more pfkey derived
1523 * in netlink excl is a flag and you wouldnt need
1524 * a type XFRM_MSG_UPDPOLICY - JHS */
1525 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1526 err = xfrm_policy_insert(p->dir, xp, excl);
1527 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1528
1529 if (err) {
1530 security_xfrm_policy_free(xp->security);
1531 kfree(xp);
1532 return err;
1533 }
1534
1535 c.event = nlh->nlmsg_type;
1536 c.seq = nlh->nlmsg_seq;
1537 c.portid = nlh->nlmsg_pid;
1538 km_policy_notify(xp, p->dir, &c);
1539
1540 xfrm_pol_put(xp);
1541
1542 return 0;
1543 }
1544
1545 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1546 {
1547 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1548 int i;
1549
1550 if (xp->xfrm_nr == 0)
1551 return 0;
1552
1553 for (i = 0; i < xp->xfrm_nr; i++) {
1554 struct xfrm_user_tmpl *up = &vec[i];
1555 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1556
1557 memset(up, 0, sizeof(*up));
1558 memcpy(&up->id, &kp->id, sizeof(up->id));
1559 up->family = kp->encap_family;
1560 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1561 up->reqid = kp->reqid;
1562 up->mode = kp->mode;
1563 up->share = kp->share;
1564 up->optional = kp->optional;
1565 up->aalgos = kp->aalgos;
1566 up->ealgos = kp->ealgos;
1567 up->calgos = kp->calgos;
1568 }
1569
1570 return nla_put(skb, XFRMA_TMPL,
1571 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1572 }
1573
1574 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1575 {
1576 if (x->security) {
1577 return copy_sec_ctx(x->security, skb);
1578 }
1579 return 0;
1580 }
1581
1582 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1583 {
1584 if (xp->security)
1585 return copy_sec_ctx(xp->security, skb);
1586 return 0;
1587 }
1588 static inline size_t userpolicy_type_attrsize(void)
1589 {
1590 #ifdef CONFIG_XFRM_SUB_POLICY
1591 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1592 #else
1593 return 0;
1594 #endif
1595 }
1596
1597 #ifdef CONFIG_XFRM_SUB_POLICY
1598 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1599 {
1600 struct xfrm_userpolicy_type upt = {
1601 .type = type,
1602 };
1603
1604 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1605 }
1606
1607 #else
1608 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1609 {
1610 return 0;
1611 }
1612 #endif
1613
1614 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1615 {
1616 struct xfrm_dump_info *sp = ptr;
1617 struct xfrm_userpolicy_info *p;
1618 struct sk_buff *in_skb = sp->in_skb;
1619 struct sk_buff *skb = sp->out_skb;
1620 struct nlmsghdr *nlh;
1621 int err;
1622
1623 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1624 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1625 if (nlh == NULL)
1626 return -EMSGSIZE;
1627
1628 p = nlmsg_data(nlh);
1629 copy_to_user_policy(xp, p, dir);
1630 err = copy_to_user_tmpl(xp, skb);
1631 if (!err)
1632 err = copy_to_user_sec_ctx(xp, skb);
1633 if (!err)
1634 err = copy_to_user_policy_type(xp->type, skb);
1635 if (!err)
1636 err = xfrm_mark_put(skb, &xp->mark);
1637 if (err) {
1638 nlmsg_cancel(skb, nlh);
1639 return err;
1640 }
1641 nlmsg_end(skb, nlh);
1642 return 0;
1643 }
1644
1645 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1646 {
1647 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1648 struct net *net = sock_net(cb->skb->sk);
1649
1650 xfrm_policy_walk_done(walk, net);
1651 return 0;
1652 }
1653
1654 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1655 {
1656 struct net *net = sock_net(skb->sk);
1657 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1658 struct xfrm_dump_info info;
1659
1660 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1661 sizeof(cb->args) - sizeof(cb->args[0]));
1662
1663 info.in_skb = cb->skb;
1664 info.out_skb = skb;
1665 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1666 info.nlmsg_flags = NLM_F_MULTI;
1667
1668 if (!cb->args[0]) {
1669 cb->args[0] = 1;
1670 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1671 }
1672
1673 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1674
1675 return skb->len;
1676 }
1677
1678 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1679 struct xfrm_policy *xp,
1680 int dir, u32 seq)
1681 {
1682 struct xfrm_dump_info info;
1683 struct sk_buff *skb;
1684 int err;
1685
1686 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1687 if (!skb)
1688 return ERR_PTR(-ENOMEM);
1689
1690 info.in_skb = in_skb;
1691 info.out_skb = skb;
1692 info.nlmsg_seq = seq;
1693 info.nlmsg_flags = 0;
1694
1695 err = dump_one_policy(xp, dir, 0, &info);
1696 if (err) {
1697 kfree_skb(skb);
1698 return ERR_PTR(err);
1699 }
1700
1701 return skb;
1702 }
1703
1704 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1705 struct nlattr **attrs)
1706 {
1707 struct net *net = sock_net(skb->sk);
1708 struct xfrm_policy *xp;
1709 struct xfrm_userpolicy_id *p;
1710 u8 type = XFRM_POLICY_TYPE_MAIN;
1711 int err;
1712 struct km_event c;
1713 int delete;
1714 struct xfrm_mark m;
1715 u32 mark = xfrm_mark_get(attrs, &m);
1716
1717 p = nlmsg_data(nlh);
1718 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1719
1720 err = copy_from_user_policy_type(&type, attrs);
1721 if (err)
1722 return err;
1723
1724 err = verify_policy_dir(p->dir);
1725 if (err)
1726 return err;
1727
1728 if (p->index)
1729 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1730 else {
1731 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1732 struct xfrm_sec_ctx *ctx;
1733
1734 err = verify_sec_ctx_len(attrs);
1735 if (err)
1736 return err;
1737
1738 ctx = NULL;
1739 if (rt) {
1740 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1741
1742 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1743 if (err)
1744 return err;
1745 }
1746 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1747 ctx, delete, &err);
1748 security_xfrm_policy_free(ctx);
1749 }
1750 if (xp == NULL)
1751 return -ENOENT;
1752
1753 if (!delete) {
1754 struct sk_buff *resp_skb;
1755
1756 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1757 if (IS_ERR(resp_skb)) {
1758 err = PTR_ERR(resp_skb);
1759 } else {
1760 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1761 NETLINK_CB(skb).portid);
1762 }
1763 } else {
1764 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1765
1766 if (err != 0)
1767 goto out;
1768
1769 c.data.byid = p->index;
1770 c.event = nlh->nlmsg_type;
1771 c.seq = nlh->nlmsg_seq;
1772 c.portid = nlh->nlmsg_pid;
1773 km_policy_notify(xp, p->dir, &c);
1774 }
1775
1776 out:
1777 xfrm_pol_put(xp);
1778 if (delete && err == 0)
1779 xfrm_garbage_collect(net);
1780 return err;
1781 }
1782
1783 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1784 struct nlattr **attrs)
1785 {
1786 struct net *net = sock_net(skb->sk);
1787 struct km_event c;
1788 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1789 int err;
1790
1791 err = xfrm_state_flush(net, p->proto, true);
1792 if (err) {
1793 if (err == -ESRCH) /* empty table */
1794 return 0;
1795 return err;
1796 }
1797 c.data.proto = p->proto;
1798 c.event = nlh->nlmsg_type;
1799 c.seq = nlh->nlmsg_seq;
1800 c.portid = nlh->nlmsg_pid;
1801 c.net = net;
1802 km_state_notify(NULL, &c);
1803
1804 return 0;
1805 }
1806
1807 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1808 {
1809 size_t replay_size = x->replay_esn ?
1810 xfrm_replay_state_esn_len(x->replay_esn) :
1811 sizeof(struct xfrm_replay_state);
1812
1813 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1814 + nla_total_size(replay_size)
1815 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1816 + nla_total_size(sizeof(struct xfrm_mark))
1817 + nla_total_size(4) /* XFRM_AE_RTHR */
1818 + nla_total_size(4); /* XFRM_AE_ETHR */
1819 }
1820
1821 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1822 {
1823 struct xfrm_aevent_id *id;
1824 struct nlmsghdr *nlh;
1825 int err;
1826
1827 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1828 if (nlh == NULL)
1829 return -EMSGSIZE;
1830
1831 id = nlmsg_data(nlh);
1832 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1833 id->sa_id.spi = x->id.spi;
1834 id->sa_id.family = x->props.family;
1835 id->sa_id.proto = x->id.proto;
1836 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1837 id->reqid = x->props.reqid;
1838 id->flags = c->data.aevent;
1839
1840 if (x->replay_esn) {
1841 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1842 xfrm_replay_state_esn_len(x->replay_esn),
1843 x->replay_esn);
1844 } else {
1845 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1846 &x->replay);
1847 }
1848 if (err)
1849 goto out_cancel;
1850 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1851 if (err)
1852 goto out_cancel;
1853
1854 if (id->flags & XFRM_AE_RTHR) {
1855 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1856 if (err)
1857 goto out_cancel;
1858 }
1859 if (id->flags & XFRM_AE_ETHR) {
1860 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1861 x->replay_maxage * 10 / HZ);
1862 if (err)
1863 goto out_cancel;
1864 }
1865 err = xfrm_mark_put(skb, &x->mark);
1866 if (err)
1867 goto out_cancel;
1868
1869 nlmsg_end(skb, nlh);
1870 return 0;
1871
1872 out_cancel:
1873 nlmsg_cancel(skb, nlh);
1874 return err;
1875 }
1876
1877 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1878 struct nlattr **attrs)
1879 {
1880 struct net *net = sock_net(skb->sk);
1881 struct xfrm_state *x;
1882 struct sk_buff *r_skb;
1883 int err;
1884 struct km_event c;
1885 u32 mark;
1886 struct xfrm_mark m;
1887 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1888 struct xfrm_usersa_id *id = &p->sa_id;
1889
1890 mark = xfrm_mark_get(attrs, &m);
1891
1892 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1893 if (x == NULL)
1894 return -ESRCH;
1895
1896 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1897 if (r_skb == NULL) {
1898 xfrm_state_put(x);
1899 return -ENOMEM;
1900 }
1901
1902 /*
1903 * XXX: is this lock really needed - none of the other
1904 * gets lock (the concern is things getting updated
1905 * while we are still reading) - jhs
1906 */
1907 spin_lock_bh(&x->lock);
1908 c.data.aevent = p->flags;
1909 c.seq = nlh->nlmsg_seq;
1910 c.portid = nlh->nlmsg_pid;
1911
1912 if (build_aevent(r_skb, x, &c) < 0)
1913 BUG();
1914 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1915 spin_unlock_bh(&x->lock);
1916 xfrm_state_put(x);
1917 return err;
1918 }
1919
1920 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1921 struct nlattr **attrs)
1922 {
1923 struct net *net = sock_net(skb->sk);
1924 struct xfrm_state *x;
1925 struct km_event c;
1926 int err = -EINVAL;
1927 u32 mark = 0;
1928 struct xfrm_mark m;
1929 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1930 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1931 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1932 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1933
1934 if (!lt && !rp && !re)
1935 return err;
1936
1937 /* pedantic mode - thou shalt sayeth replaceth */
1938 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1939 return err;
1940
1941 mark = xfrm_mark_get(attrs, &m);
1942
1943 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1944 if (x == NULL)
1945 return -ESRCH;
1946
1947 if (x->km.state != XFRM_STATE_VALID)
1948 goto out;
1949
1950 err = xfrm_replay_verify_len(x->replay_esn, re);
1951 if (err)
1952 goto out;
1953
1954 spin_lock_bh(&x->lock);
1955 xfrm_update_ae_params(x, attrs, 1);
1956 spin_unlock_bh(&x->lock);
1957
1958 c.event = nlh->nlmsg_type;
1959 c.seq = nlh->nlmsg_seq;
1960 c.portid = nlh->nlmsg_pid;
1961 c.data.aevent = XFRM_AE_CU;
1962 km_state_notify(x, &c);
1963 err = 0;
1964 out:
1965 xfrm_state_put(x);
1966 return err;
1967 }
1968
1969 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1970 struct nlattr **attrs)
1971 {
1972 struct net *net = sock_net(skb->sk);
1973 struct km_event c;
1974 u8 type = XFRM_POLICY_TYPE_MAIN;
1975 int err;
1976
1977 err = copy_from_user_policy_type(&type, attrs);
1978 if (err)
1979 return err;
1980
1981 err = xfrm_policy_flush(net, type, true);
1982 if (err) {
1983 if (err == -ESRCH) /* empty table */
1984 return 0;
1985 return err;
1986 }
1987
1988 c.data.type = type;
1989 c.event = nlh->nlmsg_type;
1990 c.seq = nlh->nlmsg_seq;
1991 c.portid = nlh->nlmsg_pid;
1992 c.net = net;
1993 km_policy_notify(NULL, 0, &c);
1994 return 0;
1995 }
1996
1997 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1998 struct nlattr **attrs)
1999 {
2000 struct net *net = sock_net(skb->sk);
2001 struct xfrm_policy *xp;
2002 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2003 struct xfrm_userpolicy_info *p = &up->pol;
2004 u8 type = XFRM_POLICY_TYPE_MAIN;
2005 int err = -ENOENT;
2006 struct xfrm_mark m;
2007 u32 mark = xfrm_mark_get(attrs, &m);
2008
2009 err = copy_from_user_policy_type(&type, attrs);
2010 if (err)
2011 return err;
2012
2013 err = verify_policy_dir(p->dir);
2014 if (err)
2015 return err;
2016
2017 if (p->index)
2018 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2019 else {
2020 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2021 struct xfrm_sec_ctx *ctx;
2022
2023 err = verify_sec_ctx_len(attrs);
2024 if (err)
2025 return err;
2026
2027 ctx = NULL;
2028 if (rt) {
2029 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2030
2031 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2032 if (err)
2033 return err;
2034 }
2035 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2036 &p->sel, ctx, 0, &err);
2037 security_xfrm_policy_free(ctx);
2038 }
2039 if (xp == NULL)
2040 return -ENOENT;
2041
2042 if (unlikely(xp->walk.dead))
2043 goto out;
2044
2045 err = 0;
2046 if (up->hard) {
2047 xfrm_policy_delete(xp, p->dir);
2048 xfrm_audit_policy_delete(xp, 1, true);
2049 } else {
2050 // reset the timers here?
2051 WARN(1, "Dont know what to do with soft policy expire\n");
2052 }
2053 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2054
2055 out:
2056 xfrm_pol_put(xp);
2057 return err;
2058 }
2059
2060 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2061 struct nlattr **attrs)
2062 {
2063 struct net *net = sock_net(skb->sk);
2064 struct xfrm_state *x;
2065 int err;
2066 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2067 struct xfrm_usersa_info *p = &ue->state;
2068 struct xfrm_mark m;
2069 u32 mark = xfrm_mark_get(attrs, &m);
2070
2071 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2072
2073 err = -ENOENT;
2074 if (x == NULL)
2075 return err;
2076
2077 spin_lock_bh(&x->lock);
2078 err = -EINVAL;
2079 if (x->km.state != XFRM_STATE_VALID)
2080 goto out;
2081 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2082
2083 if (ue->hard) {
2084 __xfrm_state_delete(x);
2085 xfrm_audit_state_delete(x, 1, true);
2086 }
2087 err = 0;
2088 out:
2089 spin_unlock_bh(&x->lock);
2090 xfrm_state_put(x);
2091 return err;
2092 }
2093
2094 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2095 struct nlattr **attrs)
2096 {
2097 struct net *net = sock_net(skb->sk);
2098 struct xfrm_policy *xp;
2099 struct xfrm_user_tmpl *ut;
2100 int i;
2101 struct nlattr *rt = attrs[XFRMA_TMPL];
2102 struct xfrm_mark mark;
2103
2104 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2105 struct xfrm_state *x = xfrm_state_alloc(net);
2106 int err = -ENOMEM;
2107
2108 if (!x)
2109 goto nomem;
2110
2111 xfrm_mark_get(attrs, &mark);
2112
2113 err = verify_newpolicy_info(&ua->policy);
2114 if (err)
2115 goto bad_policy;
2116
2117 /* build an XP */
2118 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2119 if (!xp)
2120 goto free_state;
2121
2122 memcpy(&x->id, &ua->id, sizeof(ua->id));
2123 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2124 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2125 xp->mark.m = x->mark.m = mark.m;
2126 xp->mark.v = x->mark.v = mark.v;
2127 ut = nla_data(rt);
2128 /* extract the templates and for each call km_key */
2129 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2130 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2131 memcpy(&x->id, &t->id, sizeof(x->id));
2132 x->props.mode = t->mode;
2133 x->props.reqid = t->reqid;
2134 x->props.family = ut->family;
2135 t->aalgos = ua->aalgos;
2136 t->ealgos = ua->ealgos;
2137 t->calgos = ua->calgos;
2138 err = km_query(x, t, xp);
2139
2140 }
2141
2142 kfree(x);
2143 kfree(xp);
2144
2145 return 0;
2146
2147 bad_policy:
2148 WARN(1, "BAD policy passed\n");
2149 free_state:
2150 kfree(x);
2151 nomem:
2152 return err;
2153 }
2154
2155 #ifdef CONFIG_XFRM_MIGRATE
2156 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2157 struct xfrm_kmaddress *k,
2158 struct nlattr **attrs, int *num)
2159 {
2160 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2161 struct xfrm_user_migrate *um;
2162 int i, num_migrate;
2163
2164 if (k != NULL) {
2165 struct xfrm_user_kmaddress *uk;
2166
2167 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2168 memcpy(&k->local, &uk->local, sizeof(k->local));
2169 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2170 k->family = uk->family;
2171 k->reserved = uk->reserved;
2172 }
2173
2174 um = nla_data(rt);
2175 num_migrate = nla_len(rt) / sizeof(*um);
2176
2177 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2178 return -EINVAL;
2179
2180 for (i = 0; i < num_migrate; i++, um++, ma++) {
2181 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2182 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2183 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2184 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2185
2186 ma->proto = um->proto;
2187 ma->mode = um->mode;
2188 ma->reqid = um->reqid;
2189
2190 ma->old_family = um->old_family;
2191 ma->new_family = um->new_family;
2192 }
2193
2194 *num = i;
2195 return 0;
2196 }
2197
2198 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2199 struct nlattr **attrs)
2200 {
2201 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2202 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2203 struct xfrm_kmaddress km, *kmp;
2204 u8 type;
2205 int err;
2206 int n = 0;
2207 struct net *net = sock_net(skb->sk);
2208
2209 if (attrs[XFRMA_MIGRATE] == NULL)
2210 return -EINVAL;
2211
2212 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2213
2214 err = copy_from_user_policy_type(&type, attrs);
2215 if (err)
2216 return err;
2217
2218 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2219 if (err)
2220 return err;
2221
2222 if (!n)
2223 return 0;
2224
2225 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2226
2227 return 0;
2228 }
2229 #else
2230 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2231 struct nlattr **attrs)
2232 {
2233 return -ENOPROTOOPT;
2234 }
2235 #endif
2236
2237 #ifdef CONFIG_XFRM_MIGRATE
2238 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2239 {
2240 struct xfrm_user_migrate um;
2241
2242 memset(&um, 0, sizeof(um));
2243 um.proto = m->proto;
2244 um.mode = m->mode;
2245 um.reqid = m->reqid;
2246 um.old_family = m->old_family;
2247 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2248 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2249 um.new_family = m->new_family;
2250 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2251 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2252
2253 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2254 }
2255
2256 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2257 {
2258 struct xfrm_user_kmaddress uk;
2259
2260 memset(&uk, 0, sizeof(uk));
2261 uk.family = k->family;
2262 uk.reserved = k->reserved;
2263 memcpy(&uk.local, &k->local, sizeof(uk.local));
2264 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2265
2266 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2267 }
2268
2269 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2270 {
2271 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2272 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2273 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2274 + userpolicy_type_attrsize();
2275 }
2276
2277 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2278 int num_migrate, const struct xfrm_kmaddress *k,
2279 const struct xfrm_selector *sel, u8 dir, u8 type)
2280 {
2281 const struct xfrm_migrate *mp;
2282 struct xfrm_userpolicy_id *pol_id;
2283 struct nlmsghdr *nlh;
2284 int i, err;
2285
2286 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2287 if (nlh == NULL)
2288 return -EMSGSIZE;
2289
2290 pol_id = nlmsg_data(nlh);
2291 /* copy data from selector, dir, and type to the pol_id */
2292 memset(pol_id, 0, sizeof(*pol_id));
2293 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2294 pol_id->dir = dir;
2295
2296 if (k != NULL) {
2297 err = copy_to_user_kmaddress(k, skb);
2298 if (err)
2299 goto out_cancel;
2300 }
2301 err = copy_to_user_policy_type(type, skb);
2302 if (err)
2303 goto out_cancel;
2304 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2305 err = copy_to_user_migrate(mp, skb);
2306 if (err)
2307 goto out_cancel;
2308 }
2309
2310 nlmsg_end(skb, nlh);
2311 return 0;
2312
2313 out_cancel:
2314 nlmsg_cancel(skb, nlh);
2315 return err;
2316 }
2317
2318 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2319 const struct xfrm_migrate *m, int num_migrate,
2320 const struct xfrm_kmaddress *k)
2321 {
2322 struct net *net = &init_net;
2323 struct sk_buff *skb;
2324
2325 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2326 if (skb == NULL)
2327 return -ENOMEM;
2328
2329 /* build migrate */
2330 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2331 BUG();
2332
2333 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2334 }
2335 #else
2336 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2337 const struct xfrm_migrate *m, int num_migrate,
2338 const struct xfrm_kmaddress *k)
2339 {
2340 return -ENOPROTOOPT;
2341 }
2342 #endif
2343
2344 #define XMSGSIZE(type) sizeof(struct type)
2345
2346 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2347 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2348 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2349 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2350 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2351 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2352 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2353 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2354 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2355 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2356 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2357 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2358 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2359 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2360 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2361 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2362 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2363 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2364 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2365 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2366 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2367 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2368 };
2369
2370 #undef XMSGSIZE
2371
2372 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2373 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2374 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2375 [XFRMA_LASTUSED] = { .type = NLA_U64},
2376 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2377 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2378 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2379 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2380 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2381 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2382 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2383 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2384 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2385 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2386 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2387 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2388 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2389 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2390 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2391 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2392 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2393 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2394 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2395 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2396 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2397 [XFRMA_PROTO] = { .type = NLA_U8 },
2398 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2399 };
2400
2401 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2402 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2403 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2404 };
2405
2406 static const struct xfrm_link {
2407 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2408 int (*dump)(struct sk_buff *, struct netlink_callback *);
2409 int (*done)(struct netlink_callback *);
2410 const struct nla_policy *nla_pol;
2411 int nla_max;
2412 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2413 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2414 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2415 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2416 .dump = xfrm_dump_sa,
2417 .done = xfrm_dump_sa_done },
2418 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2419 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2420 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2421 .dump = xfrm_dump_policy,
2422 .done = xfrm_dump_policy_done },
2423 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2424 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2425 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2426 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2427 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2428 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2429 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2430 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2431 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2432 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2433 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2434 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2435 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2436 .nla_pol = xfrma_spd_policy,
2437 .nla_max = XFRMA_SPD_MAX },
2438 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2439 };
2440
2441 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2442 {
2443 struct net *net = sock_net(skb->sk);
2444 struct nlattr *attrs[XFRMA_MAX+1];
2445 const struct xfrm_link *link;
2446 int type, err;
2447
2448 #ifdef CONFIG_COMPAT
2449 if (is_compat_task())
2450 return -ENOTSUPP;
2451 #endif
2452
2453 type = nlh->nlmsg_type;
2454 if (type > XFRM_MSG_MAX)
2455 return -EINVAL;
2456
2457 type -= XFRM_MSG_BASE;
2458 link = &xfrm_dispatch[type];
2459
2460 /* All operations require privileges, even GET */
2461 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2462 return -EPERM;
2463
2464 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2465 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2466 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2467 if (link->dump == NULL)
2468 return -EINVAL;
2469
2470 {
2471 struct netlink_dump_control c = {
2472 .dump = link->dump,
2473 .done = link->done,
2474 };
2475 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2476 }
2477 }
2478
2479 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2480 link->nla_max ? : XFRMA_MAX,
2481 link->nla_pol ? : xfrma_policy);
2482 if (err < 0)
2483 return err;
2484
2485 if (link->doit == NULL)
2486 return -EINVAL;
2487
2488 return link->doit(skb, nlh, attrs);
2489 }
2490
2491 static void xfrm_netlink_rcv(struct sk_buff *skb)
2492 {
2493 struct net *net = sock_net(skb->sk);
2494
2495 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2496 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2497 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2498 }
2499
2500 static inline size_t xfrm_expire_msgsize(void)
2501 {
2502 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2503 + nla_total_size(sizeof(struct xfrm_mark));
2504 }
2505
2506 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2507 {
2508 struct xfrm_user_expire *ue;
2509 struct nlmsghdr *nlh;
2510 int err;
2511
2512 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2513 if (nlh == NULL)
2514 return -EMSGSIZE;
2515
2516 ue = nlmsg_data(nlh);
2517 copy_to_user_state(x, &ue->state);
2518 ue->hard = (c->data.hard != 0) ? 1 : 0;
2519
2520 err = xfrm_mark_put(skb, &x->mark);
2521 if (err)
2522 return err;
2523
2524 nlmsg_end(skb, nlh);
2525 return 0;
2526 }
2527
2528 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2529 {
2530 struct net *net = xs_net(x);
2531 struct sk_buff *skb;
2532
2533 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2534 if (skb == NULL)
2535 return -ENOMEM;
2536
2537 if (build_expire(skb, x, c) < 0) {
2538 kfree_skb(skb);
2539 return -EMSGSIZE;
2540 }
2541
2542 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2543 }
2544
2545 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2546 {
2547 struct net *net = xs_net(x);
2548 struct sk_buff *skb;
2549
2550 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2551 if (skb == NULL)
2552 return -ENOMEM;
2553
2554 if (build_aevent(skb, x, c) < 0)
2555 BUG();
2556
2557 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2558 }
2559
2560 static int xfrm_notify_sa_flush(const struct km_event *c)
2561 {
2562 struct net *net = c->net;
2563 struct xfrm_usersa_flush *p;
2564 struct nlmsghdr *nlh;
2565 struct sk_buff *skb;
2566 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2567
2568 skb = nlmsg_new(len, GFP_ATOMIC);
2569 if (skb == NULL)
2570 return -ENOMEM;
2571
2572 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2573 if (nlh == NULL) {
2574 kfree_skb(skb);
2575 return -EMSGSIZE;
2576 }
2577
2578 p = nlmsg_data(nlh);
2579 p->proto = c->data.proto;
2580
2581 nlmsg_end(skb, nlh);
2582
2583 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2584 }
2585
2586 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2587 {
2588 size_t l = 0;
2589 if (x->aead)
2590 l += nla_total_size(aead_len(x->aead));
2591 if (x->aalg) {
2592 l += nla_total_size(sizeof(struct xfrm_algo) +
2593 (x->aalg->alg_key_len + 7) / 8);
2594 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2595 }
2596 if (x->ealg)
2597 l += nla_total_size(xfrm_alg_len(x->ealg));
2598 if (x->calg)
2599 l += nla_total_size(sizeof(*x->calg));
2600 if (x->encap)
2601 l += nla_total_size(sizeof(*x->encap));
2602 if (x->tfcpad)
2603 l += nla_total_size(sizeof(x->tfcpad));
2604 if (x->replay_esn)
2605 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2606 else
2607 l += nla_total_size(sizeof(struct xfrm_replay_state));
2608 if (x->security)
2609 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2610 x->security->ctx_len);
2611 if (x->coaddr)
2612 l += nla_total_size(sizeof(*x->coaddr));
2613 if (x->props.extra_flags)
2614 l += nla_total_size(sizeof(x->props.extra_flags));
2615
2616 /* Must count x->lastused as it may become non-zero behind our back. */
2617 l += nla_total_size(sizeof(u64));
2618
2619 return l;
2620 }
2621
2622 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2623 {
2624 struct net *net = xs_net(x);
2625 struct xfrm_usersa_info *p;
2626 struct xfrm_usersa_id *id;
2627 struct nlmsghdr *nlh;
2628 struct sk_buff *skb;
2629 int len = xfrm_sa_len(x);
2630 int headlen, err;
2631
2632 headlen = sizeof(*p);
2633 if (c->event == XFRM_MSG_DELSA) {
2634 len += nla_total_size(headlen);
2635 headlen = sizeof(*id);
2636 len += nla_total_size(sizeof(struct xfrm_mark));
2637 }
2638 len += NLMSG_ALIGN(headlen);
2639
2640 skb = nlmsg_new(len, GFP_ATOMIC);
2641 if (skb == NULL)
2642 return -ENOMEM;
2643
2644 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2645 err = -EMSGSIZE;
2646 if (nlh == NULL)
2647 goto out_free_skb;
2648
2649 p = nlmsg_data(nlh);
2650 if (c->event == XFRM_MSG_DELSA) {
2651 struct nlattr *attr;
2652
2653 id = nlmsg_data(nlh);
2654 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2655 id->spi = x->id.spi;
2656 id->family = x->props.family;
2657 id->proto = x->id.proto;
2658
2659 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2660 err = -EMSGSIZE;
2661 if (attr == NULL)
2662 goto out_free_skb;
2663
2664 p = nla_data(attr);
2665 }
2666 err = copy_to_user_state_extra(x, p, skb);
2667 if (err)
2668 goto out_free_skb;
2669
2670 nlmsg_end(skb, nlh);
2671
2672 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2673
2674 out_free_skb:
2675 kfree_skb(skb);
2676 return err;
2677 }
2678
2679 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2680 {
2681
2682 switch (c->event) {
2683 case XFRM_MSG_EXPIRE:
2684 return xfrm_exp_state_notify(x, c);
2685 case XFRM_MSG_NEWAE:
2686 return xfrm_aevent_state_notify(x, c);
2687 case XFRM_MSG_DELSA:
2688 case XFRM_MSG_UPDSA:
2689 case XFRM_MSG_NEWSA:
2690 return xfrm_notify_sa(x, c);
2691 case XFRM_MSG_FLUSHSA:
2692 return xfrm_notify_sa_flush(c);
2693 default:
2694 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2695 c->event);
2696 break;
2697 }
2698
2699 return 0;
2700
2701 }
2702
2703 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2704 struct xfrm_policy *xp)
2705 {
2706 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2707 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2708 + nla_total_size(sizeof(struct xfrm_mark))
2709 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2710 + userpolicy_type_attrsize();
2711 }
2712
2713 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2714 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2715 {
2716 __u32 seq = xfrm_get_acqseq();
2717 struct xfrm_user_acquire *ua;
2718 struct nlmsghdr *nlh;
2719 int err;
2720
2721 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2722 if (nlh == NULL)
2723 return -EMSGSIZE;
2724
2725 ua = nlmsg_data(nlh);
2726 memcpy(&ua->id, &x->id, sizeof(ua->id));
2727 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2728 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2729 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2730 ua->aalgos = xt->aalgos;
2731 ua->ealgos = xt->ealgos;
2732 ua->calgos = xt->calgos;
2733 ua->seq = x->km.seq = seq;
2734
2735 err = copy_to_user_tmpl(xp, skb);
2736 if (!err)
2737 err = copy_to_user_state_sec_ctx(x, skb);
2738 if (!err)
2739 err = copy_to_user_policy_type(xp->type, skb);
2740 if (!err)
2741 err = xfrm_mark_put(skb, &xp->mark);
2742 if (err) {
2743 nlmsg_cancel(skb, nlh);
2744 return err;
2745 }
2746
2747 nlmsg_end(skb, nlh);
2748 return 0;
2749 }
2750
2751 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2752 struct xfrm_policy *xp)
2753 {
2754 struct net *net = xs_net(x);
2755 struct sk_buff *skb;
2756
2757 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2758 if (skb == NULL)
2759 return -ENOMEM;
2760
2761 if (build_acquire(skb, x, xt, xp) < 0)
2762 BUG();
2763
2764 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2765 }
2766
2767 /* User gives us xfrm_user_policy_info followed by an array of 0
2768 * or more templates.
2769 */
2770 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2771 u8 *data, int len, int *dir)
2772 {
2773 struct net *net = sock_net(sk);
2774 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2775 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2776 struct xfrm_policy *xp;
2777 int nr;
2778
2779 switch (sk->sk_family) {
2780 case AF_INET:
2781 if (opt != IP_XFRM_POLICY) {
2782 *dir = -EOPNOTSUPP;
2783 return NULL;
2784 }
2785 break;
2786 #if IS_ENABLED(CONFIG_IPV6)
2787 case AF_INET6:
2788 if (opt != IPV6_XFRM_POLICY) {
2789 *dir = -EOPNOTSUPP;
2790 return NULL;
2791 }
2792 break;
2793 #endif
2794 default:
2795 *dir = -EINVAL;
2796 return NULL;
2797 }
2798
2799 *dir = -EINVAL;
2800
2801 if (len < sizeof(*p) ||
2802 verify_newpolicy_info(p))
2803 return NULL;
2804
2805 nr = ((len - sizeof(*p)) / sizeof(*ut));
2806 if (validate_tmpl(nr, ut, p->sel.family))
2807 return NULL;
2808
2809 if (p->dir > XFRM_POLICY_OUT)
2810 return NULL;
2811
2812 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2813 if (xp == NULL) {
2814 *dir = -ENOBUFS;
2815 return NULL;
2816 }
2817
2818 copy_from_user_policy(xp, p);
2819 xp->type = XFRM_POLICY_TYPE_MAIN;
2820 copy_templates(xp, ut, nr);
2821
2822 *dir = p->dir;
2823
2824 return xp;
2825 }
2826
2827 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2828 {
2829 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2830 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2831 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2832 + nla_total_size(sizeof(struct xfrm_mark))
2833 + userpolicy_type_attrsize();
2834 }
2835
2836 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2837 int dir, const struct km_event *c)
2838 {
2839 struct xfrm_user_polexpire *upe;
2840 int hard = c->data.hard;
2841 struct nlmsghdr *nlh;
2842 int err;
2843
2844 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2845 if (nlh == NULL)
2846 return -EMSGSIZE;
2847
2848 upe = nlmsg_data(nlh);
2849 copy_to_user_policy(xp, &upe->pol, dir);
2850 err = copy_to_user_tmpl(xp, skb);
2851 if (!err)
2852 err = copy_to_user_sec_ctx(xp, skb);
2853 if (!err)
2854 err = copy_to_user_policy_type(xp->type, skb);
2855 if (!err)
2856 err = xfrm_mark_put(skb, &xp->mark);
2857 if (err) {
2858 nlmsg_cancel(skb, nlh);
2859 return err;
2860 }
2861 upe->hard = !!hard;
2862
2863 nlmsg_end(skb, nlh);
2864 return 0;
2865 }
2866
2867 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2868 {
2869 struct net *net = xp_net(xp);
2870 struct sk_buff *skb;
2871
2872 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2873 if (skb == NULL)
2874 return -ENOMEM;
2875
2876 if (build_polexpire(skb, xp, dir, c) < 0)
2877 BUG();
2878
2879 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2880 }
2881
2882 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2883 {
2884 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2885 struct net *net = xp_net(xp);
2886 struct xfrm_userpolicy_info *p;
2887 struct xfrm_userpolicy_id *id;
2888 struct nlmsghdr *nlh;
2889 struct sk_buff *skb;
2890 int headlen, err;
2891
2892 headlen = sizeof(*p);
2893 if (c->event == XFRM_MSG_DELPOLICY) {
2894 len += nla_total_size(headlen);
2895 headlen = sizeof(*id);
2896 }
2897 len += userpolicy_type_attrsize();
2898 len += nla_total_size(sizeof(struct xfrm_mark));
2899 len += NLMSG_ALIGN(headlen);
2900
2901 skb = nlmsg_new(len, GFP_ATOMIC);
2902 if (skb == NULL)
2903 return -ENOMEM;
2904
2905 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2906 err = -EMSGSIZE;
2907 if (nlh == NULL)
2908 goto out_free_skb;
2909
2910 p = nlmsg_data(nlh);
2911 if (c->event == XFRM_MSG_DELPOLICY) {
2912 struct nlattr *attr;
2913
2914 id = nlmsg_data(nlh);
2915 memset(id, 0, sizeof(*id));
2916 id->dir = dir;
2917 if (c->data.byid)
2918 id->index = xp->index;
2919 else
2920 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2921
2922 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2923 err = -EMSGSIZE;
2924 if (attr == NULL)
2925 goto out_free_skb;
2926
2927 p = nla_data(attr);
2928 }
2929
2930 copy_to_user_policy(xp, p, dir);
2931 err = copy_to_user_tmpl(xp, skb);
2932 if (!err)
2933 err = copy_to_user_policy_type(xp->type, skb);
2934 if (!err)
2935 err = xfrm_mark_put(skb, &xp->mark);
2936 if (err)
2937 goto out_free_skb;
2938
2939 nlmsg_end(skb, nlh);
2940
2941 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2942
2943 out_free_skb:
2944 kfree_skb(skb);
2945 return err;
2946 }
2947
2948 static int xfrm_notify_policy_flush(const struct km_event *c)
2949 {
2950 struct net *net = c->net;
2951 struct nlmsghdr *nlh;
2952 struct sk_buff *skb;
2953 int err;
2954
2955 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2956 if (skb == NULL)
2957 return -ENOMEM;
2958
2959 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2960 err = -EMSGSIZE;
2961 if (nlh == NULL)
2962 goto out_free_skb;
2963 err = copy_to_user_policy_type(c->data.type, skb);
2964 if (err)
2965 goto out_free_skb;
2966
2967 nlmsg_end(skb, nlh);
2968
2969 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2970
2971 out_free_skb:
2972 kfree_skb(skb);
2973 return err;
2974 }
2975
2976 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2977 {
2978
2979 switch (c->event) {
2980 case XFRM_MSG_NEWPOLICY:
2981 case XFRM_MSG_UPDPOLICY:
2982 case XFRM_MSG_DELPOLICY:
2983 return xfrm_notify_policy(xp, dir, c);
2984 case XFRM_MSG_FLUSHPOLICY:
2985 return xfrm_notify_policy_flush(c);
2986 case XFRM_MSG_POLEXPIRE:
2987 return xfrm_exp_policy_notify(xp, dir, c);
2988 default:
2989 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2990 c->event);
2991 }
2992
2993 return 0;
2994
2995 }
2996
2997 static inline size_t xfrm_report_msgsize(void)
2998 {
2999 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3000 }
3001
3002 static int build_report(struct sk_buff *skb, u8 proto,
3003 struct xfrm_selector *sel, xfrm_address_t *addr)
3004 {
3005 struct xfrm_user_report *ur;
3006 struct nlmsghdr *nlh;
3007
3008 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3009 if (nlh == NULL)
3010 return -EMSGSIZE;
3011
3012 ur = nlmsg_data(nlh);
3013 ur->proto = proto;
3014 memcpy(&ur->sel, sel, sizeof(ur->sel));
3015
3016 if (addr) {
3017 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3018 if (err) {
3019 nlmsg_cancel(skb, nlh);
3020 return err;
3021 }
3022 }
3023 nlmsg_end(skb, nlh);
3024 return 0;
3025 }
3026
3027 static int xfrm_send_report(struct net *net, u8 proto,
3028 struct xfrm_selector *sel, xfrm_address_t *addr)
3029 {
3030 struct sk_buff *skb;
3031
3032 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3033 if (skb == NULL)
3034 return -ENOMEM;
3035
3036 if (build_report(skb, proto, sel, addr) < 0)
3037 BUG();
3038
3039 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3040 }
3041
3042 static inline size_t xfrm_mapping_msgsize(void)
3043 {
3044 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3045 }
3046
3047 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3048 xfrm_address_t *new_saddr, __be16 new_sport)
3049 {
3050 struct xfrm_user_mapping *um;
3051 struct nlmsghdr *nlh;
3052
3053 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3054 if (nlh == NULL)
3055 return -EMSGSIZE;
3056
3057 um = nlmsg_data(nlh);
3058
3059 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3060 um->id.spi = x->id.spi;
3061 um->id.family = x->props.family;
3062 um->id.proto = x->id.proto;
3063 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3064 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3065 um->new_sport = new_sport;
3066 um->old_sport = x->encap->encap_sport;
3067 um->reqid = x->props.reqid;
3068
3069 nlmsg_end(skb, nlh);
3070 return 0;
3071 }
3072
3073 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3074 __be16 sport)
3075 {
3076 struct net *net = xs_net(x);
3077 struct sk_buff *skb;
3078
3079 if (x->id.proto != IPPROTO_ESP)
3080 return -EINVAL;
3081
3082 if (!x->encap)
3083 return -EINVAL;
3084
3085 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3086 if (skb == NULL)
3087 return -ENOMEM;
3088
3089 if (build_mapping(skb, x, ipaddr, sport) < 0)
3090 BUG();
3091
3092 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3093 }
3094
3095 static bool xfrm_is_alive(const struct km_event *c)
3096 {
3097 return (bool)xfrm_acquire_is_on(c->net);
3098 }
3099
3100 static struct xfrm_mgr netlink_mgr = {
3101 .id = "netlink",
3102 .notify = xfrm_send_state_notify,
3103 .acquire = xfrm_send_acquire,
3104 .compile_policy = xfrm_compile_policy,
3105 .notify_policy = xfrm_send_policy_notify,
3106 .report = xfrm_send_report,
3107 .migrate = xfrm_send_migrate,
3108 .new_mapping = xfrm_send_mapping,
3109 .is_alive = xfrm_is_alive,
3110 };
3111
3112 static int __net_init xfrm_user_net_init(struct net *net)
3113 {
3114 struct sock *nlsk;
3115 struct netlink_kernel_cfg cfg = {
3116 .groups = XFRMNLGRP_MAX,
3117 .input = xfrm_netlink_rcv,
3118 };
3119
3120 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3121 if (nlsk == NULL)
3122 return -ENOMEM;
3123 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3124 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3125 return 0;
3126 }
3127
3128 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3129 {
3130 struct net *net;
3131 list_for_each_entry(net, net_exit_list, exit_list)
3132 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3133 synchronize_net();
3134 list_for_each_entry(net, net_exit_list, exit_list)
3135 netlink_kernel_release(net->xfrm.nlsk_stash);
3136 }
3137
3138 static struct pernet_operations xfrm_user_net_ops = {
3139 .init = xfrm_user_net_init,
3140 .exit_batch = xfrm_user_net_exit,
3141 };
3142
3143 static int __init xfrm_user_init(void)
3144 {
3145 int rv;
3146
3147 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3148
3149 rv = register_pernet_subsys(&xfrm_user_net_ops);
3150 if (rv < 0)
3151 return rv;
3152 rv = xfrm_register_km(&netlink_mgr);
3153 if (rv < 0)
3154 unregister_pernet_subsys(&xfrm_user_net_ops);
3155 return rv;
3156 }
3157
3158 static void __exit xfrm_user_exit(void)
3159 {
3160 xfrm_unregister_km(&netlink_mgr);
3161 unregister_pernet_subsys(&xfrm_user_net_ops);
3162 }
3163
3164 module_init(xfrm_user_init);
3165 module_exit(xfrm_user_exit);
3166 MODULE_LICENSE("GPL");
3167 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3168
Linux kernel - Deliverables
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