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