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