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