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