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[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <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 / 8) > MAX_AH_AUTH_LEN ||
337 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
338 return -EINVAL;
339 *props = algo->desc.sadb_alg_id;
340
341 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
342 if (!p)
343 return -ENOMEM;
344
345 strcpy(p->alg_name, algo->name);
346 if (!p->alg_trunc_len)
347 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
348
349 *algpp = p;
350 return 0;
351 }
352
353 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
354 struct nlattr *rta)
355 {
356 struct xfrm_algo_aead *p, *ualg;
357 struct xfrm_algo_desc *algo;
358
359 if (!rta)
360 return 0;
361
362 ualg = nla_data(rta);
363
364 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
365 if (!algo)
366 return -ENOSYS;
367 *props = algo->desc.sadb_alg_id;
368
369 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
370 if (!p)
371 return -ENOMEM;
372
373 strcpy(p->alg_name, algo->name);
374 *algpp = p;
375 return 0;
376 }
377
378 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
379 struct nlattr *rp)
380 {
381 struct xfrm_replay_state_esn *up;
382 int ulen;
383
384 if (!replay_esn || !rp)
385 return 0;
386
387 up = nla_data(rp);
388 ulen = xfrm_replay_state_esn_len(up);
389
390 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
391 return -EINVAL;
392
393 return 0;
394 }
395
396 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
397 struct xfrm_replay_state_esn **preplay_esn,
398 struct nlattr *rta)
399 {
400 struct xfrm_replay_state_esn *p, *pp, *up;
401 int klen, ulen;
402
403 if (!rta)
404 return 0;
405
406 up = nla_data(rta);
407 klen = xfrm_replay_state_esn_len(up);
408 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
409
410 p = kzalloc(klen, GFP_KERNEL);
411 if (!p)
412 return -ENOMEM;
413
414 pp = kzalloc(klen, GFP_KERNEL);
415 if (!pp) {
416 kfree(p);
417 return -ENOMEM;
418 }
419
420 memcpy(p, up, ulen);
421 memcpy(pp, up, ulen);
422
423 *replay_esn = p;
424 *preplay_esn = pp;
425
426 return 0;
427 }
428
429 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
430 {
431 int len = 0;
432
433 if (xfrm_ctx) {
434 len += sizeof(struct xfrm_user_sec_ctx);
435 len += xfrm_ctx->ctx_len;
436 }
437 return len;
438 }
439
440 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
441 {
442 memcpy(&x->id, &p->id, sizeof(x->id));
443 memcpy(&x->sel, &p->sel, sizeof(x->sel));
444 memcpy(&x->lft, &p->lft, sizeof(x->lft));
445 x->props.mode = p->mode;
446 x->props.replay_window = min_t(unsigned int, p->replay_window,
447 sizeof(x->replay.bitmap) * 8);
448 x->props.reqid = p->reqid;
449 x->props.family = p->family;
450 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
451 x->props.flags = p->flags;
452
453 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
454 x->sel.family = p->family;
455 }
456
457 /*
458 * someday when pfkey also has support, we could have the code
459 * somehow made shareable and move it to xfrm_state.c - JHS
460 *
461 */
462 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
463 int update_esn)
464 {
465 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
466 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
467 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
468 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
469 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
470
471 if (re) {
472 struct xfrm_replay_state_esn *replay_esn;
473 replay_esn = nla_data(re);
474 memcpy(x->replay_esn, replay_esn,
475 xfrm_replay_state_esn_len(replay_esn));
476 memcpy(x->preplay_esn, replay_esn,
477 xfrm_replay_state_esn_len(replay_esn));
478 }
479
480 if (rp) {
481 struct xfrm_replay_state *replay;
482 replay = nla_data(rp);
483 memcpy(&x->replay, replay, sizeof(*replay));
484 memcpy(&x->preplay, replay, sizeof(*replay));
485 }
486
487 if (lt) {
488 struct xfrm_lifetime_cur *ltime;
489 ltime = nla_data(lt);
490 x->curlft.bytes = ltime->bytes;
491 x->curlft.packets = ltime->packets;
492 x->curlft.add_time = ltime->add_time;
493 x->curlft.use_time = ltime->use_time;
494 }
495
496 if (et)
497 x->replay_maxage = nla_get_u32(et);
498
499 if (rt)
500 x->replay_maxdiff = nla_get_u32(rt);
501 }
502
503 static struct xfrm_state *xfrm_state_construct(struct net *net,
504 struct xfrm_usersa_info *p,
505 struct nlattr **attrs,
506 int *errp)
507 {
508 struct xfrm_state *x = xfrm_state_alloc(net);
509 int err = -ENOMEM;
510
511 if (!x)
512 goto error_no_put;
513
514 copy_from_user_state(x, p);
515
516 if (attrs[XFRMA_SA_EXTRA_FLAGS])
517 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
518
519 if ((err = attach_aead(&x->aead, &x->props.ealgo,
520 attrs[XFRMA_ALG_AEAD])))
521 goto error;
522 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
523 attrs[XFRMA_ALG_AUTH_TRUNC])))
524 goto error;
525 if (!x->props.aalgo) {
526 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
527 attrs[XFRMA_ALG_AUTH])))
528 goto error;
529 }
530 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
531 xfrm_ealg_get_byname,
532 attrs[XFRMA_ALG_CRYPT])))
533 goto error;
534 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
535 xfrm_calg_get_byname,
536 attrs[XFRMA_ALG_COMP])))
537 goto error;
538
539 if (attrs[XFRMA_ENCAP]) {
540 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
541 sizeof(*x->encap), GFP_KERNEL);
542 if (x->encap == NULL)
543 goto error;
544 }
545
546 if (attrs[XFRMA_TFCPAD])
547 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
548
549 if (attrs[XFRMA_COADDR]) {
550 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
551 sizeof(*x->coaddr), GFP_KERNEL);
552 if (x->coaddr == NULL)
553 goto error;
554 }
555
556 xfrm_mark_get(attrs, &x->mark);
557
558 err = __xfrm_init_state(x, false);
559 if (err)
560 goto error;
561
562 if (attrs[XFRMA_SEC_CTX] &&
563 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
564 goto error;
565
566 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
567 attrs[XFRMA_REPLAY_ESN_VAL])))
568 goto error;
569
570 x->km.seq = p->seq;
571 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
572 /* sysctl_xfrm_aevent_etime is in 100ms units */
573 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
574
575 if ((err = xfrm_init_replay(x)))
576 goto error;
577
578 /* override default values from above */
579 xfrm_update_ae_params(x, attrs, 0);
580
581 return x;
582
583 error:
584 x->km.state = XFRM_STATE_DEAD;
585 xfrm_state_put(x);
586 error_no_put:
587 *errp = err;
588 return NULL;
589 }
590
591 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
592 struct nlattr **attrs)
593 {
594 struct net *net = sock_net(skb->sk);
595 struct xfrm_usersa_info *p = nlmsg_data(nlh);
596 struct xfrm_state *x;
597 int err;
598 struct km_event c;
599
600 err = verify_newsa_info(p, attrs);
601 if (err)
602 return err;
603
604 x = xfrm_state_construct(net, p, attrs, &err);
605 if (!x)
606 return err;
607
608 xfrm_state_hold(x);
609 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
610 err = xfrm_state_add(x);
611 else
612 err = xfrm_state_update(x);
613
614 xfrm_audit_state_add(x, err ? 0 : 1, true);
615
616 if (err < 0) {
617 x->km.state = XFRM_STATE_DEAD;
618 __xfrm_state_put(x);
619 goto out;
620 }
621
622 c.seq = nlh->nlmsg_seq;
623 c.portid = nlh->nlmsg_pid;
624 c.event = nlh->nlmsg_type;
625
626 km_state_notify(x, &c);
627 out:
628 xfrm_state_put(x);
629 return err;
630 }
631
632 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
633 struct xfrm_usersa_id *p,
634 struct nlattr **attrs,
635 int *errp)
636 {
637 struct xfrm_state *x = NULL;
638 struct xfrm_mark m;
639 int err;
640 u32 mark = xfrm_mark_get(attrs, &m);
641
642 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
643 err = -ESRCH;
644 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
645 } else {
646 xfrm_address_t *saddr = NULL;
647
648 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
649 if (!saddr) {
650 err = -EINVAL;
651 goto out;
652 }
653
654 err = -ESRCH;
655 x = xfrm_state_lookup_byaddr(net, mark,
656 &p->daddr, saddr,
657 p->proto, p->family);
658 }
659
660 out:
661 if (!x && errp)
662 *errp = err;
663 return x;
664 }
665
666 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
667 struct nlattr **attrs)
668 {
669 struct net *net = sock_net(skb->sk);
670 struct xfrm_state *x;
671 int err = -ESRCH;
672 struct km_event c;
673 struct xfrm_usersa_id *p = nlmsg_data(nlh);
674
675 x = xfrm_user_state_lookup(net, p, attrs, &err);
676 if (x == NULL)
677 return err;
678
679 if ((err = security_xfrm_state_delete(x)) != 0)
680 goto out;
681
682 if (xfrm_state_kern(x)) {
683 err = -EPERM;
684 goto out;
685 }
686
687 err = xfrm_state_delete(x);
688
689 if (err < 0)
690 goto out;
691
692 c.seq = nlh->nlmsg_seq;
693 c.portid = nlh->nlmsg_pid;
694 c.event = nlh->nlmsg_type;
695 km_state_notify(x, &c);
696
697 out:
698 xfrm_audit_state_delete(x, err ? 0 : 1, true);
699 xfrm_state_put(x);
700 return err;
701 }
702
703 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
704 {
705 memset(p, 0, sizeof(*p));
706 memcpy(&p->id, &x->id, sizeof(p->id));
707 memcpy(&p->sel, &x->sel, sizeof(p->sel));
708 memcpy(&p->lft, &x->lft, sizeof(p->lft));
709 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
710 memcpy(&p->stats, &x->stats, sizeof(p->stats));
711 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
712 p->mode = x->props.mode;
713 p->replay_window = x->props.replay_window;
714 p->reqid = x->props.reqid;
715 p->family = x->props.family;
716 p->flags = x->props.flags;
717 p->seq = x->km.seq;
718 }
719
720 struct xfrm_dump_info {
721 struct sk_buff *in_skb;
722 struct sk_buff *out_skb;
723 u32 nlmsg_seq;
724 u16 nlmsg_flags;
725 };
726
727 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
728 {
729 struct xfrm_user_sec_ctx *uctx;
730 struct nlattr *attr;
731 int ctx_size = sizeof(*uctx) + s->ctx_len;
732
733 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
734 if (attr == NULL)
735 return -EMSGSIZE;
736
737 uctx = nla_data(attr);
738 uctx->exttype = XFRMA_SEC_CTX;
739 uctx->len = ctx_size;
740 uctx->ctx_doi = s->ctx_doi;
741 uctx->ctx_alg = s->ctx_alg;
742 uctx->ctx_len = s->ctx_len;
743 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
744
745 return 0;
746 }
747
748 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
749 {
750 struct xfrm_algo *algo;
751 struct nlattr *nla;
752
753 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
754 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
755 if (!nla)
756 return -EMSGSIZE;
757
758 algo = nla_data(nla);
759 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
760 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
761 algo->alg_key_len = auth->alg_key_len;
762
763 return 0;
764 }
765
766 /* Don't change this without updating xfrm_sa_len! */
767 static int copy_to_user_state_extra(struct xfrm_state *x,
768 struct xfrm_usersa_info *p,
769 struct sk_buff *skb)
770 {
771 int ret = 0;
772
773 copy_to_user_state(x, p);
774
775 if (x->props.extra_flags) {
776 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
777 x->props.extra_flags);
778 if (ret)
779 goto out;
780 }
781
782 if (x->coaddr) {
783 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
784 if (ret)
785 goto out;
786 }
787 if (x->lastused) {
788 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
789 if (ret)
790 goto out;
791 }
792 if (x->aead) {
793 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
794 if (ret)
795 goto out;
796 }
797 if (x->aalg) {
798 ret = copy_to_user_auth(x->aalg, skb);
799 if (!ret)
800 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
801 xfrm_alg_auth_len(x->aalg), x->aalg);
802 if (ret)
803 goto out;
804 }
805 if (x->ealg) {
806 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
807 if (ret)
808 goto out;
809 }
810 if (x->calg) {
811 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
812 if (ret)
813 goto out;
814 }
815 if (x->encap) {
816 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
817 if (ret)
818 goto out;
819 }
820 if (x->tfcpad) {
821 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
822 if (ret)
823 goto out;
824 }
825 ret = xfrm_mark_put(skb, &x->mark);
826 if (ret)
827 goto out;
828 if (x->replay_esn) {
829 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
830 xfrm_replay_state_esn_len(x->replay_esn),
831 x->replay_esn);
832 if (ret)
833 goto out;
834 }
835 if (x->security)
836 ret = copy_sec_ctx(x->security, skb);
837 out:
838 return ret;
839 }
840
841 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
842 {
843 struct xfrm_dump_info *sp = ptr;
844 struct sk_buff *in_skb = sp->in_skb;
845 struct sk_buff *skb = sp->out_skb;
846 struct xfrm_usersa_info *p;
847 struct nlmsghdr *nlh;
848 int err;
849
850 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
851 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
852 if (nlh == NULL)
853 return -EMSGSIZE;
854
855 p = nlmsg_data(nlh);
856
857 err = copy_to_user_state_extra(x, p, skb);
858 if (err) {
859 nlmsg_cancel(skb, nlh);
860 return err;
861 }
862 nlmsg_end(skb, nlh);
863 return 0;
864 }
865
866 static int xfrm_dump_sa_done(struct netlink_callback *cb)
867 {
868 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
869 struct sock *sk = cb->skb->sk;
870 struct net *net = sock_net(sk);
871
872 xfrm_state_walk_done(walk, net);
873 return 0;
874 }
875
876 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
877 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
878 {
879 struct net *net = sock_net(skb->sk);
880 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
881 struct xfrm_dump_info info;
882
883 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
884 sizeof(cb->args) - sizeof(cb->args[0]));
885
886 info.in_skb = cb->skb;
887 info.out_skb = skb;
888 info.nlmsg_seq = cb->nlh->nlmsg_seq;
889 info.nlmsg_flags = NLM_F_MULTI;
890
891 if (!cb->args[0]) {
892 struct nlattr *attrs[XFRMA_MAX+1];
893 struct xfrm_address_filter *filter = NULL;
894 u8 proto = 0;
895 int err;
896
897 cb->args[0] = 1;
898
899 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
900 xfrma_policy);
901 if (err < 0)
902 return err;
903
904 if (attrs[XFRMA_ADDRESS_FILTER]) {
905 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
906 if (filter == NULL)
907 return -ENOMEM;
908
909 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
910 sizeof(*filter));
911 }
912
913 if (attrs[XFRMA_PROTO])
914 proto = nla_get_u8(attrs[XFRMA_PROTO]);
915
916 xfrm_state_walk_init(walk, proto, filter);
917 }
918
919 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
920
921 return skb->len;
922 }
923
924 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
925 struct xfrm_state *x, u32 seq)
926 {
927 struct xfrm_dump_info info;
928 struct sk_buff *skb;
929 int err;
930
931 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
932 if (!skb)
933 return ERR_PTR(-ENOMEM);
934
935 info.in_skb = in_skb;
936 info.out_skb = skb;
937 info.nlmsg_seq = seq;
938 info.nlmsg_flags = 0;
939
940 err = dump_one_state(x, 0, &info);
941 if (err) {
942 kfree_skb(skb);
943 return ERR_PTR(err);
944 }
945
946 return skb;
947 }
948
949 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
950 * Must be called with RCU read lock.
951 */
952 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
953 u32 pid, unsigned int group)
954 {
955 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
956
957 if (nlsk)
958 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
959 else
960 return -1;
961 }
962
963 static inline size_t xfrm_spdinfo_msgsize(void)
964 {
965 return NLMSG_ALIGN(4)
966 + nla_total_size(sizeof(struct xfrmu_spdinfo))
967 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
968 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
969 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
970 }
971
972 static int build_spdinfo(struct sk_buff *skb, struct net *net,
973 u32 portid, u32 seq, u32 flags)
974 {
975 struct xfrmk_spdinfo si;
976 struct xfrmu_spdinfo spc;
977 struct xfrmu_spdhinfo sph;
978 struct xfrmu_spdhthresh spt4, spt6;
979 struct nlmsghdr *nlh;
980 int err;
981 u32 *f;
982 unsigned lseq;
983
984 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
985 if (nlh == NULL) /* shouldn't really happen ... */
986 return -EMSGSIZE;
987
988 f = nlmsg_data(nlh);
989 *f = flags;
990 xfrm_spd_getinfo(net, &si);
991 spc.incnt = si.incnt;
992 spc.outcnt = si.outcnt;
993 spc.fwdcnt = si.fwdcnt;
994 spc.inscnt = si.inscnt;
995 spc.outscnt = si.outscnt;
996 spc.fwdscnt = si.fwdscnt;
997 sph.spdhcnt = si.spdhcnt;
998 sph.spdhmcnt = si.spdhmcnt;
999
1000 do {
1001 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1002
1003 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1004 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1005 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1006 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1007 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1008
1009 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1010 if (!err)
1011 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1012 if (!err)
1013 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1014 if (!err)
1015 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1016 if (err) {
1017 nlmsg_cancel(skb, nlh);
1018 return err;
1019 }
1020
1021 return nlmsg_end(skb, nlh);
1022 }
1023
1024 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1025 struct nlattr **attrs)
1026 {
1027 struct net *net = sock_net(skb->sk);
1028 struct xfrmu_spdhthresh *thresh4 = NULL;
1029 struct xfrmu_spdhthresh *thresh6 = NULL;
1030
1031 /* selector prefixlen thresholds to hash policies */
1032 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1033 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1034
1035 if (nla_len(rta) < sizeof(*thresh4))
1036 return -EINVAL;
1037 thresh4 = nla_data(rta);
1038 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1039 return -EINVAL;
1040 }
1041 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1042 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1043
1044 if (nla_len(rta) < sizeof(*thresh6))
1045 return -EINVAL;
1046 thresh6 = nla_data(rta);
1047 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1048 return -EINVAL;
1049 }
1050
1051 if (thresh4 || thresh6) {
1052 write_seqlock(&net->xfrm.policy_hthresh.lock);
1053 if (thresh4) {
1054 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1055 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1056 }
1057 if (thresh6) {
1058 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1059 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1060 }
1061 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1062
1063 xfrm_policy_hash_rebuild(net);
1064 }
1065
1066 return 0;
1067 }
1068
1069 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1070 struct nlattr **attrs)
1071 {
1072 struct net *net = sock_net(skb->sk);
1073 struct sk_buff *r_skb;
1074 u32 *flags = nlmsg_data(nlh);
1075 u32 sportid = NETLINK_CB(skb).portid;
1076 u32 seq = nlh->nlmsg_seq;
1077
1078 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1079 if (r_skb == NULL)
1080 return -ENOMEM;
1081
1082 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1083 BUG();
1084
1085 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1086 }
1087
1088 static inline size_t xfrm_sadinfo_msgsize(void)
1089 {
1090 return NLMSG_ALIGN(4)
1091 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1092 + nla_total_size(4); /* XFRMA_SAD_CNT */
1093 }
1094
1095 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1096 u32 portid, u32 seq, u32 flags)
1097 {
1098 struct xfrmk_sadinfo si;
1099 struct xfrmu_sadhinfo sh;
1100 struct nlmsghdr *nlh;
1101 int err;
1102 u32 *f;
1103
1104 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1105 if (nlh == NULL) /* shouldn't really happen ... */
1106 return -EMSGSIZE;
1107
1108 f = nlmsg_data(nlh);
1109 *f = flags;
1110 xfrm_sad_getinfo(net, &si);
1111
1112 sh.sadhmcnt = si.sadhmcnt;
1113 sh.sadhcnt = si.sadhcnt;
1114
1115 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1116 if (!err)
1117 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1118 if (err) {
1119 nlmsg_cancel(skb, nlh);
1120 return err;
1121 }
1122
1123 return nlmsg_end(skb, nlh);
1124 }
1125
1126 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1127 struct nlattr **attrs)
1128 {
1129 struct net *net = sock_net(skb->sk);
1130 struct sk_buff *r_skb;
1131 u32 *flags = nlmsg_data(nlh);
1132 u32 sportid = NETLINK_CB(skb).portid;
1133 u32 seq = nlh->nlmsg_seq;
1134
1135 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1136 if (r_skb == NULL)
1137 return -ENOMEM;
1138
1139 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1140 BUG();
1141
1142 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1143 }
1144
1145 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1146 struct nlattr **attrs)
1147 {
1148 struct net *net = sock_net(skb->sk);
1149 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1150 struct xfrm_state *x;
1151 struct sk_buff *resp_skb;
1152 int err = -ESRCH;
1153
1154 x = xfrm_user_state_lookup(net, p, attrs, &err);
1155 if (x == NULL)
1156 goto out_noput;
1157
1158 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1159 if (IS_ERR(resp_skb)) {
1160 err = PTR_ERR(resp_skb);
1161 } else {
1162 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1163 }
1164 xfrm_state_put(x);
1165 out_noput:
1166 return err;
1167 }
1168
1169 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1170 struct nlattr **attrs)
1171 {
1172 struct net *net = sock_net(skb->sk);
1173 struct xfrm_state *x;
1174 struct xfrm_userspi_info *p;
1175 struct sk_buff *resp_skb;
1176 xfrm_address_t *daddr;
1177 int family;
1178 int err;
1179 u32 mark;
1180 struct xfrm_mark m;
1181
1182 p = nlmsg_data(nlh);
1183 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1184 if (err)
1185 goto out_noput;
1186
1187 family = p->info.family;
1188 daddr = &p->info.id.daddr;
1189
1190 x = NULL;
1191
1192 mark = xfrm_mark_get(attrs, &m);
1193 if (p->info.seq) {
1194 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1195 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1196 xfrm_state_put(x);
1197 x = NULL;
1198 }
1199 }
1200
1201 if (!x)
1202 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1203 p->info.id.proto, daddr,
1204 &p->info.saddr, 1,
1205 family);
1206 err = -ENOENT;
1207 if (x == NULL)
1208 goto out_noput;
1209
1210 err = xfrm_alloc_spi(x, p->min, p->max);
1211 if (err)
1212 goto out;
1213
1214 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1215 if (IS_ERR(resp_skb)) {
1216 err = PTR_ERR(resp_skb);
1217 goto out;
1218 }
1219
1220 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1221
1222 out:
1223 xfrm_state_put(x);
1224 out_noput:
1225 return err;
1226 }
1227
1228 static int verify_policy_dir(u8 dir)
1229 {
1230 switch (dir) {
1231 case XFRM_POLICY_IN:
1232 case XFRM_POLICY_OUT:
1233 case XFRM_POLICY_FWD:
1234 break;
1235
1236 default:
1237 return -EINVAL;
1238 }
1239
1240 return 0;
1241 }
1242
1243 static int verify_policy_type(u8 type)
1244 {
1245 switch (type) {
1246 case XFRM_POLICY_TYPE_MAIN:
1247 #ifdef CONFIG_XFRM_SUB_POLICY
1248 case XFRM_POLICY_TYPE_SUB:
1249 #endif
1250 break;
1251
1252 default:
1253 return -EINVAL;
1254 }
1255
1256 return 0;
1257 }
1258
1259 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1260 {
1261 int ret;
1262
1263 switch (p->share) {
1264 case XFRM_SHARE_ANY:
1265 case XFRM_SHARE_SESSION:
1266 case XFRM_SHARE_USER:
1267 case XFRM_SHARE_UNIQUE:
1268 break;
1269
1270 default:
1271 return -EINVAL;
1272 }
1273
1274 switch (p->action) {
1275 case XFRM_POLICY_ALLOW:
1276 case XFRM_POLICY_BLOCK:
1277 break;
1278
1279 default:
1280 return -EINVAL;
1281 }
1282
1283 switch (p->sel.family) {
1284 case AF_INET:
1285 break;
1286
1287 case AF_INET6:
1288 #if IS_ENABLED(CONFIG_IPV6)
1289 break;
1290 #else
1291 return -EAFNOSUPPORT;
1292 #endif
1293
1294 default:
1295 return -EINVAL;
1296 }
1297
1298 ret = verify_policy_dir(p->dir);
1299 if (ret)
1300 return ret;
1301 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1302 return -EINVAL;
1303
1304 return 0;
1305 }
1306
1307 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1308 {
1309 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1310 struct xfrm_user_sec_ctx *uctx;
1311
1312 if (!rt)
1313 return 0;
1314
1315 uctx = nla_data(rt);
1316 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1317 }
1318
1319 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1320 int nr)
1321 {
1322 int i;
1323
1324 xp->xfrm_nr = nr;
1325 for (i = 0; i < nr; i++, ut++) {
1326 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1327
1328 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1329 memcpy(&t->saddr, &ut->saddr,
1330 sizeof(xfrm_address_t));
1331 t->reqid = ut->reqid;
1332 t->mode = ut->mode;
1333 t->share = ut->share;
1334 t->optional = ut->optional;
1335 t->aalgos = ut->aalgos;
1336 t->ealgos = ut->ealgos;
1337 t->calgos = ut->calgos;
1338 /* If all masks are ~0, then we allow all algorithms. */
1339 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1340 t->encap_family = ut->family;
1341 }
1342 }
1343
1344 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1345 {
1346 int i;
1347
1348 if (nr > XFRM_MAX_DEPTH)
1349 return -EINVAL;
1350
1351 for (i = 0; i < nr; i++) {
1352 /* We never validated the ut->family value, so many
1353 * applications simply leave it at zero. The check was
1354 * never made and ut->family was ignored because all
1355 * templates could be assumed to have the same family as
1356 * the policy itself. Now that we will have ipv4-in-ipv6
1357 * and ipv6-in-ipv4 tunnels, this is no longer true.
1358 */
1359 if (!ut[i].family)
1360 ut[i].family = family;
1361
1362 switch (ut[i].family) {
1363 case AF_INET:
1364 break;
1365 #if IS_ENABLED(CONFIG_IPV6)
1366 case AF_INET6:
1367 break;
1368 #endif
1369 default:
1370 return -EINVAL;
1371 }
1372 }
1373
1374 return 0;
1375 }
1376
1377 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1378 {
1379 struct nlattr *rt = attrs[XFRMA_TMPL];
1380
1381 if (!rt) {
1382 pol->xfrm_nr = 0;
1383 } else {
1384 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1385 int nr = nla_len(rt) / sizeof(*utmpl);
1386 int err;
1387
1388 err = validate_tmpl(nr, utmpl, pol->family);
1389 if (err)
1390 return err;
1391
1392 copy_templates(pol, utmpl, nr);
1393 }
1394 return 0;
1395 }
1396
1397 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1398 {
1399 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1400 struct xfrm_userpolicy_type *upt;
1401 u8 type = XFRM_POLICY_TYPE_MAIN;
1402 int err;
1403
1404 if (rt) {
1405 upt = nla_data(rt);
1406 type = upt->type;
1407 }
1408
1409 err = verify_policy_type(type);
1410 if (err)
1411 return err;
1412
1413 *tp = type;
1414 return 0;
1415 }
1416
1417 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1418 {
1419 xp->priority = p->priority;
1420 xp->index = p->index;
1421 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1422 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1423 xp->action = p->action;
1424 xp->flags = p->flags;
1425 xp->family = p->sel.family;
1426 /* XXX xp->share = p->share; */
1427 }
1428
1429 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1430 {
1431 memset(p, 0, sizeof(*p));
1432 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1433 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1434 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1435 p->priority = xp->priority;
1436 p->index = xp->index;
1437 p->sel.family = xp->family;
1438 p->dir = dir;
1439 p->action = xp->action;
1440 p->flags = xp->flags;
1441 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1442 }
1443
1444 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1445 {
1446 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1447 int err;
1448
1449 if (!xp) {
1450 *errp = -ENOMEM;
1451 return NULL;
1452 }
1453
1454 copy_from_user_policy(xp, p);
1455
1456 err = copy_from_user_policy_type(&xp->type, attrs);
1457 if (err)
1458 goto error;
1459
1460 if (!(err = copy_from_user_tmpl(xp, attrs)))
1461 err = copy_from_user_sec_ctx(xp, attrs);
1462 if (err)
1463 goto error;
1464
1465 xfrm_mark_get(attrs, &xp->mark);
1466
1467 return xp;
1468 error:
1469 *errp = err;
1470 xp->walk.dead = 1;
1471 xfrm_policy_destroy(xp);
1472 return NULL;
1473 }
1474
1475 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1476 struct nlattr **attrs)
1477 {
1478 struct net *net = sock_net(skb->sk);
1479 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1480 struct xfrm_policy *xp;
1481 struct km_event c;
1482 int err;
1483 int excl;
1484
1485 err = verify_newpolicy_info(p);
1486 if (err)
1487 return err;
1488 err = verify_sec_ctx_len(attrs);
1489 if (err)
1490 return err;
1491
1492 xp = xfrm_policy_construct(net, p, attrs, &err);
1493 if (!xp)
1494 return err;
1495
1496 /* shouldn't excl be based on nlh flags??
1497 * Aha! this is anti-netlink really i.e more pfkey derived
1498 * in netlink excl is a flag and you wouldnt need
1499 * a type XFRM_MSG_UPDPOLICY - JHS */
1500 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1501 err = xfrm_policy_insert(p->dir, xp, excl);
1502 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1503
1504 if (err) {
1505 security_xfrm_policy_free(xp->security);
1506 kfree(xp);
1507 return err;
1508 }
1509
1510 c.event = nlh->nlmsg_type;
1511 c.seq = nlh->nlmsg_seq;
1512 c.portid = nlh->nlmsg_pid;
1513 km_policy_notify(xp, p->dir, &c);
1514
1515 xfrm_pol_put(xp);
1516
1517 return 0;
1518 }
1519
1520 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1521 {
1522 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1523 int i;
1524
1525 if (xp->xfrm_nr == 0)
1526 return 0;
1527
1528 for (i = 0; i < xp->xfrm_nr; i++) {
1529 struct xfrm_user_tmpl *up = &vec[i];
1530 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1531
1532 memset(up, 0, sizeof(*up));
1533 memcpy(&up->id, &kp->id, sizeof(up->id));
1534 up->family = kp->encap_family;
1535 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1536 up->reqid = kp->reqid;
1537 up->mode = kp->mode;
1538 up->share = kp->share;
1539 up->optional = kp->optional;
1540 up->aalgos = kp->aalgos;
1541 up->ealgos = kp->ealgos;
1542 up->calgos = kp->calgos;
1543 }
1544
1545 return nla_put(skb, XFRMA_TMPL,
1546 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1547 }
1548
1549 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1550 {
1551 if (x->security) {
1552 return copy_sec_ctx(x->security, skb);
1553 }
1554 return 0;
1555 }
1556
1557 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1558 {
1559 if (xp->security)
1560 return copy_sec_ctx(xp->security, skb);
1561 return 0;
1562 }
1563 static inline size_t userpolicy_type_attrsize(void)
1564 {
1565 #ifdef CONFIG_XFRM_SUB_POLICY
1566 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1567 #else
1568 return 0;
1569 #endif
1570 }
1571
1572 #ifdef CONFIG_XFRM_SUB_POLICY
1573 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1574 {
1575 struct xfrm_userpolicy_type upt = {
1576 .type = type,
1577 };
1578
1579 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1580 }
1581
1582 #else
1583 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1584 {
1585 return 0;
1586 }
1587 #endif
1588
1589 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1590 {
1591 struct xfrm_dump_info *sp = ptr;
1592 struct xfrm_userpolicy_info *p;
1593 struct sk_buff *in_skb = sp->in_skb;
1594 struct sk_buff *skb = sp->out_skb;
1595 struct nlmsghdr *nlh;
1596 int err;
1597
1598 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1599 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1600 if (nlh == NULL)
1601 return -EMSGSIZE;
1602
1603 p = nlmsg_data(nlh);
1604 copy_to_user_policy(xp, p, dir);
1605 err = copy_to_user_tmpl(xp, skb);
1606 if (!err)
1607 err = copy_to_user_sec_ctx(xp, skb);
1608 if (!err)
1609 err = copy_to_user_policy_type(xp->type, skb);
1610 if (!err)
1611 err = xfrm_mark_put(skb, &xp->mark);
1612 if (err) {
1613 nlmsg_cancel(skb, nlh);
1614 return err;
1615 }
1616 nlmsg_end(skb, nlh);
1617 return 0;
1618 }
1619
1620 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1621 {
1622 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1623 struct net *net = sock_net(cb->skb->sk);
1624
1625 xfrm_policy_walk_done(walk, net);
1626 return 0;
1627 }
1628
1629 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1630 {
1631 struct net *net = sock_net(skb->sk);
1632 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1633 struct xfrm_dump_info info;
1634
1635 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1636 sizeof(cb->args) - sizeof(cb->args[0]));
1637
1638 info.in_skb = cb->skb;
1639 info.out_skb = skb;
1640 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1641 info.nlmsg_flags = NLM_F_MULTI;
1642
1643 if (!cb->args[0]) {
1644 cb->args[0] = 1;
1645 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1646 }
1647
1648 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1649
1650 return skb->len;
1651 }
1652
1653 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1654 struct xfrm_policy *xp,
1655 int dir, u32 seq)
1656 {
1657 struct xfrm_dump_info info;
1658 struct sk_buff *skb;
1659 int err;
1660
1661 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1662 if (!skb)
1663 return ERR_PTR(-ENOMEM);
1664
1665 info.in_skb = in_skb;
1666 info.out_skb = skb;
1667 info.nlmsg_seq = seq;
1668 info.nlmsg_flags = 0;
1669
1670 err = dump_one_policy(xp, dir, 0, &info);
1671 if (err) {
1672 kfree_skb(skb);
1673 return ERR_PTR(err);
1674 }
1675
1676 return skb;
1677 }
1678
1679 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1680 struct nlattr **attrs)
1681 {
1682 struct net *net = sock_net(skb->sk);
1683 struct xfrm_policy *xp;
1684 struct xfrm_userpolicy_id *p;
1685 u8 type = XFRM_POLICY_TYPE_MAIN;
1686 int err;
1687 struct km_event c;
1688 int delete;
1689 struct xfrm_mark m;
1690 u32 mark = xfrm_mark_get(attrs, &m);
1691
1692 p = nlmsg_data(nlh);
1693 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1694
1695 err = copy_from_user_policy_type(&type, attrs);
1696 if (err)
1697 return err;
1698
1699 err = verify_policy_dir(p->dir);
1700 if (err)
1701 return err;
1702
1703 if (p->index)
1704 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1705 else {
1706 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1707 struct xfrm_sec_ctx *ctx;
1708
1709 err = verify_sec_ctx_len(attrs);
1710 if (err)
1711 return err;
1712
1713 ctx = NULL;
1714 if (rt) {
1715 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1716
1717 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1718 if (err)
1719 return err;
1720 }
1721 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1722 ctx, delete, &err);
1723 security_xfrm_policy_free(ctx);
1724 }
1725 if (xp == NULL)
1726 return -ENOENT;
1727
1728 if (!delete) {
1729 struct sk_buff *resp_skb;
1730
1731 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1732 if (IS_ERR(resp_skb)) {
1733 err = PTR_ERR(resp_skb);
1734 } else {
1735 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1736 NETLINK_CB(skb).portid);
1737 }
1738 } else {
1739 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1740
1741 if (err != 0)
1742 goto out;
1743
1744 c.data.byid = p->index;
1745 c.event = nlh->nlmsg_type;
1746 c.seq = nlh->nlmsg_seq;
1747 c.portid = nlh->nlmsg_pid;
1748 km_policy_notify(xp, p->dir, &c);
1749 }
1750
1751 out:
1752 xfrm_pol_put(xp);
1753 if (delete && err == 0)
1754 xfrm_garbage_collect(net);
1755 return err;
1756 }
1757
1758 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1759 struct nlattr **attrs)
1760 {
1761 struct net *net = sock_net(skb->sk);
1762 struct km_event c;
1763 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1764 int err;
1765
1766 err = xfrm_state_flush(net, p->proto, true);
1767 if (err) {
1768 if (err == -ESRCH) /* empty table */
1769 return 0;
1770 return err;
1771 }
1772 c.data.proto = p->proto;
1773 c.event = nlh->nlmsg_type;
1774 c.seq = nlh->nlmsg_seq;
1775 c.portid = nlh->nlmsg_pid;
1776 c.net = net;
1777 km_state_notify(NULL, &c);
1778
1779 return 0;
1780 }
1781
1782 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1783 {
1784 size_t replay_size = x->replay_esn ?
1785 xfrm_replay_state_esn_len(x->replay_esn) :
1786 sizeof(struct xfrm_replay_state);
1787
1788 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1789 + nla_total_size(replay_size)
1790 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1791 + nla_total_size(sizeof(struct xfrm_mark))
1792 + nla_total_size(4) /* XFRM_AE_RTHR */
1793 + nla_total_size(4); /* XFRM_AE_ETHR */
1794 }
1795
1796 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1797 {
1798 struct xfrm_aevent_id *id;
1799 struct nlmsghdr *nlh;
1800 int err;
1801
1802 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1803 if (nlh == NULL)
1804 return -EMSGSIZE;
1805
1806 id = nlmsg_data(nlh);
1807 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1808 id->sa_id.spi = x->id.spi;
1809 id->sa_id.family = x->props.family;
1810 id->sa_id.proto = x->id.proto;
1811 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1812 id->reqid = x->props.reqid;
1813 id->flags = c->data.aevent;
1814
1815 if (x->replay_esn) {
1816 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1817 xfrm_replay_state_esn_len(x->replay_esn),
1818 x->replay_esn);
1819 } else {
1820 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1821 &x->replay);
1822 }
1823 if (err)
1824 goto out_cancel;
1825 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1826 if (err)
1827 goto out_cancel;
1828
1829 if (id->flags & XFRM_AE_RTHR) {
1830 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1831 if (err)
1832 goto out_cancel;
1833 }
1834 if (id->flags & XFRM_AE_ETHR) {
1835 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1836 x->replay_maxage * 10 / HZ);
1837 if (err)
1838 goto out_cancel;
1839 }
1840 err = xfrm_mark_put(skb, &x->mark);
1841 if (err)
1842 goto out_cancel;
1843
1844 return nlmsg_end(skb, nlh);
1845
1846 out_cancel:
1847 nlmsg_cancel(skb, nlh);
1848 return err;
1849 }
1850
1851 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1852 struct nlattr **attrs)
1853 {
1854 struct net *net = sock_net(skb->sk);
1855 struct xfrm_state *x;
1856 struct sk_buff *r_skb;
1857 int err;
1858 struct km_event c;
1859 u32 mark;
1860 struct xfrm_mark m;
1861 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1862 struct xfrm_usersa_id *id = &p->sa_id;
1863
1864 mark = xfrm_mark_get(attrs, &m);
1865
1866 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1867 if (x == NULL)
1868 return -ESRCH;
1869
1870 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1871 if (r_skb == NULL) {
1872 xfrm_state_put(x);
1873 return -ENOMEM;
1874 }
1875
1876 /*
1877 * XXX: is this lock really needed - none of the other
1878 * gets lock (the concern is things getting updated
1879 * while we are still reading) - jhs
1880 */
1881 spin_lock_bh(&x->lock);
1882 c.data.aevent = p->flags;
1883 c.seq = nlh->nlmsg_seq;
1884 c.portid = nlh->nlmsg_pid;
1885
1886 if (build_aevent(r_skb, x, &c) < 0)
1887 BUG();
1888 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1889 spin_unlock_bh(&x->lock);
1890 xfrm_state_put(x);
1891 return err;
1892 }
1893
1894 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1895 struct nlattr **attrs)
1896 {
1897 struct net *net = sock_net(skb->sk);
1898 struct xfrm_state *x;
1899 struct km_event c;
1900 int err = -EINVAL;
1901 u32 mark = 0;
1902 struct xfrm_mark m;
1903 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1904 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1905 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1906 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1907
1908 if (!lt && !rp && !re)
1909 return err;
1910
1911 /* pedantic mode - thou shalt sayeth replaceth */
1912 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1913 return err;
1914
1915 mark = xfrm_mark_get(attrs, &m);
1916
1917 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1918 if (x == NULL)
1919 return -ESRCH;
1920
1921 if (x->km.state != XFRM_STATE_VALID)
1922 goto out;
1923
1924 err = xfrm_replay_verify_len(x->replay_esn, re);
1925 if (err)
1926 goto out;
1927
1928 spin_lock_bh(&x->lock);
1929 xfrm_update_ae_params(x, attrs, 1);
1930 spin_unlock_bh(&x->lock);
1931
1932 c.event = nlh->nlmsg_type;
1933 c.seq = nlh->nlmsg_seq;
1934 c.portid = nlh->nlmsg_pid;
1935 c.data.aevent = XFRM_AE_CU;
1936 km_state_notify(x, &c);
1937 err = 0;
1938 out:
1939 xfrm_state_put(x);
1940 return err;
1941 }
1942
1943 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1944 struct nlattr **attrs)
1945 {
1946 struct net *net = sock_net(skb->sk);
1947 struct km_event c;
1948 u8 type = XFRM_POLICY_TYPE_MAIN;
1949 int err;
1950
1951 err = copy_from_user_policy_type(&type, attrs);
1952 if (err)
1953 return err;
1954
1955 err = xfrm_policy_flush(net, type, true);
1956 if (err) {
1957 if (err == -ESRCH) /* empty table */
1958 return 0;
1959 return err;
1960 }
1961
1962 c.data.type = type;
1963 c.event = nlh->nlmsg_type;
1964 c.seq = nlh->nlmsg_seq;
1965 c.portid = nlh->nlmsg_pid;
1966 c.net = net;
1967 km_policy_notify(NULL, 0, &c);
1968 return 0;
1969 }
1970
1971 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1972 struct nlattr **attrs)
1973 {
1974 struct net *net = sock_net(skb->sk);
1975 struct xfrm_policy *xp;
1976 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1977 struct xfrm_userpolicy_info *p = &up->pol;
1978 u8 type = XFRM_POLICY_TYPE_MAIN;
1979 int err = -ENOENT;
1980 struct xfrm_mark m;
1981 u32 mark = xfrm_mark_get(attrs, &m);
1982
1983 err = copy_from_user_policy_type(&type, attrs);
1984 if (err)
1985 return err;
1986
1987 err = verify_policy_dir(p->dir);
1988 if (err)
1989 return err;
1990
1991 if (p->index)
1992 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1993 else {
1994 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1995 struct xfrm_sec_ctx *ctx;
1996
1997 err = verify_sec_ctx_len(attrs);
1998 if (err)
1999 return err;
2000
2001 ctx = NULL;
2002 if (rt) {
2003 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2004
2005 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2006 if (err)
2007 return err;
2008 }
2009 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2010 &p->sel, ctx, 0, &err);
2011 security_xfrm_policy_free(ctx);
2012 }
2013 if (xp == NULL)
2014 return -ENOENT;
2015
2016 if (unlikely(xp->walk.dead))
2017 goto out;
2018
2019 err = 0;
2020 if (up->hard) {
2021 xfrm_policy_delete(xp, p->dir);
2022 xfrm_audit_policy_delete(xp, 1, true);
2023 } else {
2024 // reset the timers here?
2025 WARN(1, "Dont know what to do with soft policy expire\n");
2026 }
2027 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2028
2029 out:
2030 xfrm_pol_put(xp);
2031 return err;
2032 }
2033
2034 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2035 struct nlattr **attrs)
2036 {
2037 struct net *net = sock_net(skb->sk);
2038 struct xfrm_state *x;
2039 int err;
2040 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2041 struct xfrm_usersa_info *p = &ue->state;
2042 struct xfrm_mark m;
2043 u32 mark = xfrm_mark_get(attrs, &m);
2044
2045 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2046
2047 err = -ENOENT;
2048 if (x == NULL)
2049 return err;
2050
2051 spin_lock_bh(&x->lock);
2052 err = -EINVAL;
2053 if (x->km.state != XFRM_STATE_VALID)
2054 goto out;
2055 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2056
2057 if (ue->hard) {
2058 __xfrm_state_delete(x);
2059 xfrm_audit_state_delete(x, 1, true);
2060 }
2061 err = 0;
2062 out:
2063 spin_unlock_bh(&x->lock);
2064 xfrm_state_put(x);
2065 return err;
2066 }
2067
2068 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2069 struct nlattr **attrs)
2070 {
2071 struct net *net = sock_net(skb->sk);
2072 struct xfrm_policy *xp;
2073 struct xfrm_user_tmpl *ut;
2074 int i;
2075 struct nlattr *rt = attrs[XFRMA_TMPL];
2076 struct xfrm_mark mark;
2077
2078 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2079 struct xfrm_state *x = xfrm_state_alloc(net);
2080 int err = -ENOMEM;
2081
2082 if (!x)
2083 goto nomem;
2084
2085 xfrm_mark_get(attrs, &mark);
2086
2087 err = verify_newpolicy_info(&ua->policy);
2088 if (err)
2089 goto bad_policy;
2090
2091 /* build an XP */
2092 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2093 if (!xp)
2094 goto free_state;
2095
2096 memcpy(&x->id, &ua->id, sizeof(ua->id));
2097 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2098 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2099 xp->mark.m = x->mark.m = mark.m;
2100 xp->mark.v = x->mark.v = mark.v;
2101 ut = nla_data(rt);
2102 /* extract the templates and for each call km_key */
2103 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2104 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2105 memcpy(&x->id, &t->id, sizeof(x->id));
2106 x->props.mode = t->mode;
2107 x->props.reqid = t->reqid;
2108 x->props.family = ut->family;
2109 t->aalgos = ua->aalgos;
2110 t->ealgos = ua->ealgos;
2111 t->calgos = ua->calgos;
2112 err = km_query(x, t, xp);
2113
2114 }
2115
2116 kfree(x);
2117 kfree(xp);
2118
2119 return 0;
2120
2121 bad_policy:
2122 WARN(1, "BAD policy passed\n");
2123 free_state:
2124 kfree(x);
2125 nomem:
2126 return err;
2127 }
2128
2129 #ifdef CONFIG_XFRM_MIGRATE
2130 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2131 struct xfrm_kmaddress *k,
2132 struct nlattr **attrs, int *num)
2133 {
2134 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2135 struct xfrm_user_migrate *um;
2136 int i, num_migrate;
2137
2138 if (k != NULL) {
2139 struct xfrm_user_kmaddress *uk;
2140
2141 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2142 memcpy(&k->local, &uk->local, sizeof(k->local));
2143 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2144 k->family = uk->family;
2145 k->reserved = uk->reserved;
2146 }
2147
2148 um = nla_data(rt);
2149 num_migrate = nla_len(rt) / sizeof(*um);
2150
2151 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2152 return -EINVAL;
2153
2154 for (i = 0; i < num_migrate; i++, um++, ma++) {
2155 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2156 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2157 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2158 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2159
2160 ma->proto = um->proto;
2161 ma->mode = um->mode;
2162 ma->reqid = um->reqid;
2163
2164 ma->old_family = um->old_family;
2165 ma->new_family = um->new_family;
2166 }
2167
2168 *num = i;
2169 return 0;
2170 }
2171
2172 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2173 struct nlattr **attrs)
2174 {
2175 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2176 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2177 struct xfrm_kmaddress km, *kmp;
2178 u8 type;
2179 int err;
2180 int n = 0;
2181 struct net *net = sock_net(skb->sk);
2182
2183 if (attrs[XFRMA_MIGRATE] == NULL)
2184 return -EINVAL;
2185
2186 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2187
2188 err = copy_from_user_policy_type(&type, attrs);
2189 if (err)
2190 return err;
2191
2192 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2193 if (err)
2194 return err;
2195
2196 if (!n)
2197 return 0;
2198
2199 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2200
2201 return 0;
2202 }
2203 #else
2204 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2205 struct nlattr **attrs)
2206 {
2207 return -ENOPROTOOPT;
2208 }
2209 #endif
2210
2211 #ifdef CONFIG_XFRM_MIGRATE
2212 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2213 {
2214 struct xfrm_user_migrate um;
2215
2216 memset(&um, 0, sizeof(um));
2217 um.proto = m->proto;
2218 um.mode = m->mode;
2219 um.reqid = m->reqid;
2220 um.old_family = m->old_family;
2221 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2222 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2223 um.new_family = m->new_family;
2224 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2225 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2226
2227 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2228 }
2229
2230 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2231 {
2232 struct xfrm_user_kmaddress uk;
2233
2234 memset(&uk, 0, sizeof(uk));
2235 uk.family = k->family;
2236 uk.reserved = k->reserved;
2237 memcpy(&uk.local, &k->local, sizeof(uk.local));
2238 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2239
2240 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2241 }
2242
2243 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2244 {
2245 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2246 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2247 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2248 + userpolicy_type_attrsize();
2249 }
2250
2251 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2252 int num_migrate, const struct xfrm_kmaddress *k,
2253 const struct xfrm_selector *sel, u8 dir, u8 type)
2254 {
2255 const struct xfrm_migrate *mp;
2256 struct xfrm_userpolicy_id *pol_id;
2257 struct nlmsghdr *nlh;
2258 int i, err;
2259
2260 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2261 if (nlh == NULL)
2262 return -EMSGSIZE;
2263
2264 pol_id = nlmsg_data(nlh);
2265 /* copy data from selector, dir, and type to the pol_id */
2266 memset(pol_id, 0, sizeof(*pol_id));
2267 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2268 pol_id->dir = dir;
2269
2270 if (k != NULL) {
2271 err = copy_to_user_kmaddress(k, skb);
2272 if (err)
2273 goto out_cancel;
2274 }
2275 err = copy_to_user_policy_type(type, skb);
2276 if (err)
2277 goto out_cancel;
2278 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2279 err = copy_to_user_migrate(mp, skb);
2280 if (err)
2281 goto out_cancel;
2282 }
2283
2284 return nlmsg_end(skb, nlh);
2285
2286 out_cancel:
2287 nlmsg_cancel(skb, nlh);
2288 return err;
2289 }
2290
2291 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2292 const struct xfrm_migrate *m, int num_migrate,
2293 const struct xfrm_kmaddress *k)
2294 {
2295 struct net *net = &init_net;
2296 struct sk_buff *skb;
2297
2298 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2299 if (skb == NULL)
2300 return -ENOMEM;
2301
2302 /* build migrate */
2303 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2304 BUG();
2305
2306 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2307 }
2308 #else
2309 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2310 const struct xfrm_migrate *m, int num_migrate,
2311 const struct xfrm_kmaddress *k)
2312 {
2313 return -ENOPROTOOPT;
2314 }
2315 #endif
2316
2317 #define XMSGSIZE(type) sizeof(struct type)
2318
2319 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2320 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2321 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2322 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2323 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2324 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2325 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2326 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2327 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2328 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2329 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2330 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2331 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2332 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2333 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2334 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2335 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2336 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2337 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2338 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2339 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2340 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2341 };
2342
2343 #undef XMSGSIZE
2344
2345 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2346 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2347 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2348 [XFRMA_LASTUSED] = { .type = NLA_U64},
2349 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2350 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2351 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2352 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2353 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2354 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2355 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2356 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2357 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2358 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2359 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2360 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2361 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2362 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2363 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2364 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2365 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2366 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2367 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2368 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2369 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2370 [XFRMA_PROTO] = { .type = NLA_U8 },
2371 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2372 };
2373
2374 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2375 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2376 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2377 };
2378
2379 static const struct xfrm_link {
2380 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2381 int (*dump)(struct sk_buff *, struct netlink_callback *);
2382 int (*done)(struct netlink_callback *);
2383 const struct nla_policy *nla_pol;
2384 int nla_max;
2385 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2386 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2387 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2388 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2389 .dump = xfrm_dump_sa,
2390 .done = xfrm_dump_sa_done },
2391 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2392 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2393 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2394 .dump = xfrm_dump_policy,
2395 .done = xfrm_dump_policy_done },
2396 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2397 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2398 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2399 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2400 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2401 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2402 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2403 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2404 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2405 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2406 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2407 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2408 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2409 .nla_pol = xfrma_spd_policy,
2410 .nla_max = XFRMA_SPD_MAX },
2411 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2412 };
2413
2414 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2415 {
2416 struct net *net = sock_net(skb->sk);
2417 struct nlattr *attrs[XFRMA_MAX+1];
2418 const struct xfrm_link *link;
2419 int type, err;
2420
2421 type = nlh->nlmsg_type;
2422 if (type > XFRM_MSG_MAX)
2423 return -EINVAL;
2424
2425 type -= XFRM_MSG_BASE;
2426 link = &xfrm_dispatch[type];
2427
2428 /* All operations require privileges, even GET */
2429 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2430 return -EPERM;
2431
2432 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2433 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2434 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2435 if (link->dump == NULL)
2436 return -EINVAL;
2437
2438 {
2439 struct netlink_dump_control c = {
2440 .dump = link->dump,
2441 .done = link->done,
2442 };
2443 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2444 }
2445 }
2446
2447 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2448 link->nla_max ? : XFRMA_MAX,
2449 link->nla_pol ? : xfrma_policy);
2450 if (err < 0)
2451 return err;
2452
2453 if (link->doit == NULL)
2454 return -EINVAL;
2455
2456 return link->doit(skb, nlh, attrs);
2457 }
2458
2459 static void xfrm_netlink_rcv(struct sk_buff *skb)
2460 {
2461 struct net *net = sock_net(skb->sk);
2462
2463 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2464 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2465 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2466 }
2467
2468 static inline size_t xfrm_expire_msgsize(void)
2469 {
2470 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2471 + nla_total_size(sizeof(struct xfrm_mark));
2472 }
2473
2474 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2475 {
2476 struct xfrm_user_expire *ue;
2477 struct nlmsghdr *nlh;
2478 int err;
2479
2480 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2481 if (nlh == NULL)
2482 return -EMSGSIZE;
2483
2484 ue = nlmsg_data(nlh);
2485 copy_to_user_state(x, &ue->state);
2486 ue->hard = (c->data.hard != 0) ? 1 : 0;
2487
2488 err = xfrm_mark_put(skb, &x->mark);
2489 if (err)
2490 return err;
2491
2492 return nlmsg_end(skb, nlh);
2493 }
2494
2495 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2496 {
2497 struct net *net = xs_net(x);
2498 struct sk_buff *skb;
2499
2500 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2501 if (skb == NULL)
2502 return -ENOMEM;
2503
2504 if (build_expire(skb, x, c) < 0) {
2505 kfree_skb(skb);
2506 return -EMSGSIZE;
2507 }
2508
2509 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2510 }
2511
2512 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2513 {
2514 struct net *net = xs_net(x);
2515 struct sk_buff *skb;
2516
2517 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2518 if (skb == NULL)
2519 return -ENOMEM;
2520
2521 if (build_aevent(skb, x, c) < 0)
2522 BUG();
2523
2524 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2525 }
2526
2527 static int xfrm_notify_sa_flush(const struct km_event *c)
2528 {
2529 struct net *net = c->net;
2530 struct xfrm_usersa_flush *p;
2531 struct nlmsghdr *nlh;
2532 struct sk_buff *skb;
2533 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2534
2535 skb = nlmsg_new(len, GFP_ATOMIC);
2536 if (skb == NULL)
2537 return -ENOMEM;
2538
2539 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2540 if (nlh == NULL) {
2541 kfree_skb(skb);
2542 return -EMSGSIZE;
2543 }
2544
2545 p = nlmsg_data(nlh);
2546 p->proto = c->data.proto;
2547
2548 nlmsg_end(skb, nlh);
2549
2550 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2551 }
2552
2553 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2554 {
2555 size_t l = 0;
2556 if (x->aead)
2557 l += nla_total_size(aead_len(x->aead));
2558 if (x->aalg) {
2559 l += nla_total_size(sizeof(struct xfrm_algo) +
2560 (x->aalg->alg_key_len + 7) / 8);
2561 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2562 }
2563 if (x->ealg)
2564 l += nla_total_size(xfrm_alg_len(x->ealg));
2565 if (x->calg)
2566 l += nla_total_size(sizeof(*x->calg));
2567 if (x->encap)
2568 l += nla_total_size(sizeof(*x->encap));
2569 if (x->tfcpad)
2570 l += nla_total_size(sizeof(x->tfcpad));
2571 if (x->replay_esn)
2572 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2573 if (x->security)
2574 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2575 x->security->ctx_len);
2576 if (x->coaddr)
2577 l += nla_total_size(sizeof(*x->coaddr));
2578 if (x->props.extra_flags)
2579 l += nla_total_size(sizeof(x->props.extra_flags));
2580
2581 /* Must count x->lastused as it may become non-zero behind our back. */
2582 l += nla_total_size(sizeof(u64));
2583
2584 return l;
2585 }
2586
2587 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2588 {
2589 struct net *net = xs_net(x);
2590 struct xfrm_usersa_info *p;
2591 struct xfrm_usersa_id *id;
2592 struct nlmsghdr *nlh;
2593 struct sk_buff *skb;
2594 int len = xfrm_sa_len(x);
2595 int headlen, err;
2596
2597 headlen = sizeof(*p);
2598 if (c->event == XFRM_MSG_DELSA) {
2599 len += nla_total_size(headlen);
2600 headlen = sizeof(*id);
2601 len += nla_total_size(sizeof(struct xfrm_mark));
2602 }
2603 len += NLMSG_ALIGN(headlen);
2604
2605 skb = nlmsg_new(len, GFP_ATOMIC);
2606 if (skb == NULL)
2607 return -ENOMEM;
2608
2609 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2610 err = -EMSGSIZE;
2611 if (nlh == NULL)
2612 goto out_free_skb;
2613
2614 p = nlmsg_data(nlh);
2615 if (c->event == XFRM_MSG_DELSA) {
2616 struct nlattr *attr;
2617
2618 id = nlmsg_data(nlh);
2619 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2620 id->spi = x->id.spi;
2621 id->family = x->props.family;
2622 id->proto = x->id.proto;
2623
2624 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2625 err = -EMSGSIZE;
2626 if (attr == NULL)
2627 goto out_free_skb;
2628
2629 p = nla_data(attr);
2630 }
2631 err = copy_to_user_state_extra(x, p, skb);
2632 if (err)
2633 goto out_free_skb;
2634
2635 nlmsg_end(skb, nlh);
2636
2637 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2638
2639 out_free_skb:
2640 kfree_skb(skb);
2641 return err;
2642 }
2643
2644 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2645 {
2646
2647 switch (c->event) {
2648 case XFRM_MSG_EXPIRE:
2649 return xfrm_exp_state_notify(x, c);
2650 case XFRM_MSG_NEWAE:
2651 return xfrm_aevent_state_notify(x, c);
2652 case XFRM_MSG_DELSA:
2653 case XFRM_MSG_UPDSA:
2654 case XFRM_MSG_NEWSA:
2655 return xfrm_notify_sa(x, c);
2656 case XFRM_MSG_FLUSHSA:
2657 return xfrm_notify_sa_flush(c);
2658 default:
2659 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2660 c->event);
2661 break;
2662 }
2663
2664 return 0;
2665
2666 }
2667
2668 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2669 struct xfrm_policy *xp)
2670 {
2671 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2672 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2673 + nla_total_size(sizeof(struct xfrm_mark))
2674 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2675 + userpolicy_type_attrsize();
2676 }
2677
2678 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2679 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2680 {
2681 __u32 seq = xfrm_get_acqseq();
2682 struct xfrm_user_acquire *ua;
2683 struct nlmsghdr *nlh;
2684 int err;
2685
2686 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2687 if (nlh == NULL)
2688 return -EMSGSIZE;
2689
2690 ua = nlmsg_data(nlh);
2691 memcpy(&ua->id, &x->id, sizeof(ua->id));
2692 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2693 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2694 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2695 ua->aalgos = xt->aalgos;
2696 ua->ealgos = xt->ealgos;
2697 ua->calgos = xt->calgos;
2698 ua->seq = x->km.seq = seq;
2699
2700 err = copy_to_user_tmpl(xp, skb);
2701 if (!err)
2702 err = copy_to_user_state_sec_ctx(x, skb);
2703 if (!err)
2704 err = copy_to_user_policy_type(xp->type, skb);
2705 if (!err)
2706 err = xfrm_mark_put(skb, &xp->mark);
2707 if (err) {
2708 nlmsg_cancel(skb, nlh);
2709 return err;
2710 }
2711
2712 return nlmsg_end(skb, nlh);
2713 }
2714
2715 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2716 struct xfrm_policy *xp)
2717 {
2718 struct net *net = xs_net(x);
2719 struct sk_buff *skb;
2720
2721 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2722 if (skb == NULL)
2723 return -ENOMEM;
2724
2725 if (build_acquire(skb, x, xt, xp) < 0)
2726 BUG();
2727
2728 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2729 }
2730
2731 /* User gives us xfrm_user_policy_info followed by an array of 0
2732 * or more templates.
2733 */
2734 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2735 u8 *data, int len, int *dir)
2736 {
2737 struct net *net = sock_net(sk);
2738 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2739 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2740 struct xfrm_policy *xp;
2741 int nr;
2742
2743 switch (sk->sk_family) {
2744 case AF_INET:
2745 if (opt != IP_XFRM_POLICY) {
2746 *dir = -EOPNOTSUPP;
2747 return NULL;
2748 }
2749 break;
2750 #if IS_ENABLED(CONFIG_IPV6)
2751 case AF_INET6:
2752 if (opt != IPV6_XFRM_POLICY) {
2753 *dir = -EOPNOTSUPP;
2754 return NULL;
2755 }
2756 break;
2757 #endif
2758 default:
2759 *dir = -EINVAL;
2760 return NULL;
2761 }
2762
2763 *dir = -EINVAL;
2764
2765 if (len < sizeof(*p) ||
2766 verify_newpolicy_info(p))
2767 return NULL;
2768
2769 nr = ((len - sizeof(*p)) / sizeof(*ut));
2770 if (validate_tmpl(nr, ut, p->sel.family))
2771 return NULL;
2772
2773 if (p->dir > XFRM_POLICY_OUT)
2774 return NULL;
2775
2776 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2777 if (xp == NULL) {
2778 *dir = -ENOBUFS;
2779 return NULL;
2780 }
2781
2782 copy_from_user_policy(xp, p);
2783 xp->type = XFRM_POLICY_TYPE_MAIN;
2784 copy_templates(xp, ut, nr);
2785
2786 *dir = p->dir;
2787
2788 return xp;
2789 }
2790
2791 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2792 {
2793 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2794 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2795 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2796 + nla_total_size(sizeof(struct xfrm_mark))
2797 + userpolicy_type_attrsize();
2798 }
2799
2800 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2801 int dir, const struct km_event *c)
2802 {
2803 struct xfrm_user_polexpire *upe;
2804 int hard = c->data.hard;
2805 struct nlmsghdr *nlh;
2806 int err;
2807
2808 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2809 if (nlh == NULL)
2810 return -EMSGSIZE;
2811
2812 upe = nlmsg_data(nlh);
2813 copy_to_user_policy(xp, &upe->pol, dir);
2814 err = copy_to_user_tmpl(xp, skb);
2815 if (!err)
2816 err = copy_to_user_sec_ctx(xp, skb);
2817 if (!err)
2818 err = copy_to_user_policy_type(xp->type, skb);
2819 if (!err)
2820 err = xfrm_mark_put(skb, &xp->mark);
2821 if (err) {
2822 nlmsg_cancel(skb, nlh);
2823 return err;
2824 }
2825 upe->hard = !!hard;
2826
2827 return nlmsg_end(skb, nlh);
2828 }
2829
2830 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2831 {
2832 struct net *net = xp_net(xp);
2833 struct sk_buff *skb;
2834
2835 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2836 if (skb == NULL)
2837 return -ENOMEM;
2838
2839 if (build_polexpire(skb, xp, dir, c) < 0)
2840 BUG();
2841
2842 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2843 }
2844
2845 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2846 {
2847 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2848 struct net *net = xp_net(xp);
2849 struct xfrm_userpolicy_info *p;
2850 struct xfrm_userpolicy_id *id;
2851 struct nlmsghdr *nlh;
2852 struct sk_buff *skb;
2853 int headlen, err;
2854
2855 headlen = sizeof(*p);
2856 if (c->event == XFRM_MSG_DELPOLICY) {
2857 len += nla_total_size(headlen);
2858 headlen = sizeof(*id);
2859 }
2860 len += userpolicy_type_attrsize();
2861 len += nla_total_size(sizeof(struct xfrm_mark));
2862 len += NLMSG_ALIGN(headlen);
2863
2864 skb = nlmsg_new(len, GFP_ATOMIC);
2865 if (skb == NULL)
2866 return -ENOMEM;
2867
2868 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2869 err = -EMSGSIZE;
2870 if (nlh == NULL)
2871 goto out_free_skb;
2872
2873 p = nlmsg_data(nlh);
2874 if (c->event == XFRM_MSG_DELPOLICY) {
2875 struct nlattr *attr;
2876
2877 id = nlmsg_data(nlh);
2878 memset(id, 0, sizeof(*id));
2879 id->dir = dir;
2880 if (c->data.byid)
2881 id->index = xp->index;
2882 else
2883 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2884
2885 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2886 err = -EMSGSIZE;
2887 if (attr == NULL)
2888 goto out_free_skb;
2889
2890 p = nla_data(attr);
2891 }
2892
2893 copy_to_user_policy(xp, p, dir);
2894 err = copy_to_user_tmpl(xp, skb);
2895 if (!err)
2896 err = copy_to_user_policy_type(xp->type, skb);
2897 if (!err)
2898 err = xfrm_mark_put(skb, &xp->mark);
2899 if (err)
2900 goto out_free_skb;
2901
2902 nlmsg_end(skb, nlh);
2903
2904 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2905
2906 out_free_skb:
2907 kfree_skb(skb);
2908 return err;
2909 }
2910
2911 static int xfrm_notify_policy_flush(const struct km_event *c)
2912 {
2913 struct net *net = c->net;
2914 struct nlmsghdr *nlh;
2915 struct sk_buff *skb;
2916 int err;
2917
2918 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2919 if (skb == NULL)
2920 return -ENOMEM;
2921
2922 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2923 err = -EMSGSIZE;
2924 if (nlh == NULL)
2925 goto out_free_skb;
2926 err = copy_to_user_policy_type(c->data.type, skb);
2927 if (err)
2928 goto out_free_skb;
2929
2930 nlmsg_end(skb, nlh);
2931
2932 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2933
2934 out_free_skb:
2935 kfree_skb(skb);
2936 return err;
2937 }
2938
2939 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2940 {
2941
2942 switch (c->event) {
2943 case XFRM_MSG_NEWPOLICY:
2944 case XFRM_MSG_UPDPOLICY:
2945 case XFRM_MSG_DELPOLICY:
2946 return xfrm_notify_policy(xp, dir, c);
2947 case XFRM_MSG_FLUSHPOLICY:
2948 return xfrm_notify_policy_flush(c);
2949 case XFRM_MSG_POLEXPIRE:
2950 return xfrm_exp_policy_notify(xp, dir, c);
2951 default:
2952 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2953 c->event);
2954 }
2955
2956 return 0;
2957
2958 }
2959
2960 static inline size_t xfrm_report_msgsize(void)
2961 {
2962 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2963 }
2964
2965 static int build_report(struct sk_buff *skb, u8 proto,
2966 struct xfrm_selector *sel, xfrm_address_t *addr)
2967 {
2968 struct xfrm_user_report *ur;
2969 struct nlmsghdr *nlh;
2970
2971 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2972 if (nlh == NULL)
2973 return -EMSGSIZE;
2974
2975 ur = nlmsg_data(nlh);
2976 ur->proto = proto;
2977 memcpy(&ur->sel, sel, sizeof(ur->sel));
2978
2979 if (addr) {
2980 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2981 if (err) {
2982 nlmsg_cancel(skb, nlh);
2983 return err;
2984 }
2985 }
2986 return nlmsg_end(skb, nlh);
2987 }
2988
2989 static int xfrm_send_report(struct net *net, u8 proto,
2990 struct xfrm_selector *sel, xfrm_address_t *addr)
2991 {
2992 struct sk_buff *skb;
2993
2994 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2995 if (skb == NULL)
2996 return -ENOMEM;
2997
2998 if (build_report(skb, proto, sel, addr) < 0)
2999 BUG();
3000
3001 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3002 }
3003
3004 static inline size_t xfrm_mapping_msgsize(void)
3005 {
3006 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3007 }
3008
3009 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3010 xfrm_address_t *new_saddr, __be16 new_sport)
3011 {
3012 struct xfrm_user_mapping *um;
3013 struct nlmsghdr *nlh;
3014
3015 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3016 if (nlh == NULL)
3017 return -EMSGSIZE;
3018
3019 um = nlmsg_data(nlh);
3020
3021 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3022 um->id.spi = x->id.spi;
3023 um->id.family = x->props.family;
3024 um->id.proto = x->id.proto;
3025 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3026 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3027 um->new_sport = new_sport;
3028 um->old_sport = x->encap->encap_sport;
3029 um->reqid = x->props.reqid;
3030
3031 return nlmsg_end(skb, nlh);
3032 }
3033
3034 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3035 __be16 sport)
3036 {
3037 struct net *net = xs_net(x);
3038 struct sk_buff *skb;
3039
3040 if (x->id.proto != IPPROTO_ESP)
3041 return -EINVAL;
3042
3043 if (!x->encap)
3044 return -EINVAL;
3045
3046 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3047 if (skb == NULL)
3048 return -ENOMEM;
3049
3050 if (build_mapping(skb, x, ipaddr, sport) < 0)
3051 BUG();
3052
3053 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3054 }
3055
3056 static bool xfrm_is_alive(const struct km_event *c)
3057 {
3058 return (bool)xfrm_acquire_is_on(c->net);
3059 }
3060
3061 static struct xfrm_mgr netlink_mgr = {
3062 .id = "netlink",
3063 .notify = xfrm_send_state_notify,
3064 .acquire = xfrm_send_acquire,
3065 .compile_policy = xfrm_compile_policy,
3066 .notify_policy = xfrm_send_policy_notify,
3067 .report = xfrm_send_report,
3068 .migrate = xfrm_send_migrate,
3069 .new_mapping = xfrm_send_mapping,
3070 .is_alive = xfrm_is_alive,
3071 };
3072
3073 static int __net_init xfrm_user_net_init(struct net *net)
3074 {
3075 struct sock *nlsk;
3076 struct netlink_kernel_cfg cfg = {
3077 .groups = XFRMNLGRP_MAX,
3078 .input = xfrm_netlink_rcv,
3079 };
3080
3081 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3082 if (nlsk == NULL)
3083 return -ENOMEM;
3084 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3085 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3086 return 0;
3087 }
3088
3089 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3090 {
3091 struct net *net;
3092 list_for_each_entry(net, net_exit_list, exit_list)
3093 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3094 synchronize_net();
3095 list_for_each_entry(net, net_exit_list, exit_list)
3096 netlink_kernel_release(net->xfrm.nlsk_stash);
3097 }
3098
3099 static struct pernet_operations xfrm_user_net_ops = {
3100 .init = xfrm_user_net_init,
3101 .exit_batch = xfrm_user_net_exit,
3102 };
3103
3104 static int __init xfrm_user_init(void)
3105 {
3106 int rv;
3107
3108 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3109
3110 rv = register_pernet_subsys(&xfrm_user_net_ops);
3111 if (rv < 0)
3112 return rv;
3113 rv = xfrm_register_km(&netlink_mgr);
3114 if (rv < 0)
3115 unregister_pernet_subsys(&xfrm_user_net_ops);
3116 return rv;
3117 }
3118
3119 static void __exit xfrm_user_exit(void)
3120 {
3121 xfrm_unregister_km(&netlink_mgr);
3122 unregister_pernet_subsys(&xfrm_user_net_ops);
3123 }
3124
3125 module_init(xfrm_user_init);
3126 module_exit(xfrm_user_exit);
3127 MODULE_LICENSE("GPL");
3128 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3129
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