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