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ASoC: Add mc13783 codec
[deliverable/linux.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34
35 static inline int aead_len(struct xfrm_algo_aead *alg)
36 {
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < xfrm_alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 case XFRMA_ALG_CRYPT:
55 case XFRMA_ALG_COMP:
56 break;
57
58 default:
59 return -EINVAL;
60 }
61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64 }
65
66 static int verify_auth_trunc(struct nlattr **attrs)
67 {
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80 }
81
82 static int verify_aead(struct nlattr **attrs)
83 {
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96 }
97
98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 xfrm_address_t **addrp)
100 {
101 struct nlattr *rt = attrs[type];
102
103 if (rt && addrp)
104 *addrp = nla_data(rt);
105 }
106
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 struct xfrm_user_sec_ctx *uctx;
111
112 if (!rt)
113 return 0;
114
115 uctx = nla_data(rt);
116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 return -EINVAL;
118
119 return 0;
120 }
121
122 static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124 {
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
130 if (!rt)
131 return 0;
132
133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140 }
141
142 static int verify_newsa_info(struct xfrm_usersa_info *p,
143 struct nlattr **attrs)
144 {
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
153 #if IS_ENABLED(CONFIG_IPV6)
154 break;
155 #else
156 err = -EAFNOSUPPORT;
157 goto out;
158 #endif
159
160 default:
161 goto out;
162 }
163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
169 attrs[XFRMA_ALG_AEAD] ||
170 attrs[XFRMA_ALG_CRYPT] ||
171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
173 goto out;
174 break;
175
176 case IPPROTO_ESP:
177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
188 goto out;
189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
192 break;
193
194 case IPPROTO_COMP:
195 if (!attrs[XFRMA_ALG_COMP] ||
196 attrs[XFRMA_ALG_AEAD] ||
197 attrs[XFRMA_ALG_AUTH] ||
198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
201 goto out;
202 break;
203
204 #if IS_ENABLED(CONFIG_IPV6)
205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
210 attrs[XFRMA_ALG_AEAD] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
214 attrs[XFRMA_TFCPAD] ||
215 !attrs[XFRMA_COADDR])
216 goto out;
217 break;
218 #endif
219
220 default:
221 goto out;
222 }
223
224 if ((err = verify_aead(attrs)))
225 goto out;
226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
229 goto out;
230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
231 goto out;
232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
233 goto out;
234 if ((err = verify_sec_ctx_len(attrs)))
235 goto out;
236 if ((err = verify_replay(p, attrs)))
237 goto out;
238
239 err = -EINVAL;
240 switch (p->mode) {
241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
243 case XFRM_MODE_ROUTEOPTIMIZATION:
244 case XFRM_MODE_BEET:
245 break;
246
247 default:
248 goto out;
249 }
250
251 err = 0;
252
253 out:
254 return err;
255 }
256
257 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
259 struct nlattr *rta)
260 {
261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
267 ualg = nla_data(rta);
268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
275 if (!p)
276 return -ENOMEM;
277
278 strcpy(p->alg_name, algo->name);
279 *algpp = p;
280 return 0;
281 }
282
283 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285 {
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311 }
312
313 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315 {
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342 }
343
344 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346 {
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367 }
368
369 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371 {
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384 }
385
386 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389 {
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411 }
412
413 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
414 {
415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422 }
423
424 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425 {
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
434 x->props.flags = p->flags;
435
436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
437 x->sel.family = p->family;
438 }
439
440 /*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444 */
445 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
446 {
447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
452
453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
462 if (rp) {
463 struct xfrm_replay_state *replay;
464 replay = nla_data(rp);
465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
471 ltime = nla_data(lt);
472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
478 if (et)
479 x->replay_maxage = nla_get_u32(et);
480
481 if (rt)
482 x->replay_maxdiff = nla_get_u32(rt);
483 }
484
485 static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
487 struct nlattr **attrs,
488 int *errp)
489 {
490 struct xfrm_state *x = xfrm_state_alloc(net);
491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
503 goto error;
504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
511 attrs[XFRMA_ALG_CRYPT])))
512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
515 attrs[XFRMA_ALG_COMP])))
516 goto error;
517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
535 xfrm_mark_get(attrs, &x->mark);
536
537 err = __xfrm_init_state(x, false);
538 if (err)
539 goto error;
540
541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
543 goto error;
544
545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
549 x->km.seq = p->seq;
550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
551 /* sysctl_xfrm_aevent_etime is in 100ms units */
552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
553
554 if ((err = xfrm_init_replay(x)))
555 goto error;
556
557 /* override default values from above */
558 xfrm_update_ae_params(x, attrs);
559
560 return x;
561
562 error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565 error_no_put:
566 *errp = err;
567 return NULL;
568 }
569
570 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
571 struct nlattr **attrs)
572 {
573 struct net *net = sock_net(skb->sk);
574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
575 struct xfrm_state *x;
576 int err;
577 struct km_event c;
578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
581
582 err = verify_newsa_info(p, attrs);
583 if (err)
584 return err;
585
586 x = xfrm_state_construct(net, p, attrs, &err);
587 if (!x)
588 return err;
589
590 xfrm_state_hold(x);
591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
596 security_task_getsecid(current, &sid);
597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
598
599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
601 __xfrm_state_put(x);
602 goto out;
603 }
604
605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
607 c.event = nlh->nlmsg_type;
608
609 km_state_notify(x, &c);
610 out:
611 xfrm_state_put(x);
612 return err;
613 }
614
615 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
617 struct nlattr **attrs,
618 int *errp)
619 {
620 struct xfrm_state *x = NULL;
621 struct xfrm_mark m;
622 int err;
623 u32 mark = xfrm_mark_get(attrs, &m);
624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
628 } else {
629 xfrm_address_t *saddr = NULL;
630
631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
637 err = -ESRCH;
638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
640 p->proto, p->family);
641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647 }
648
649 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
650 struct nlattr **attrs)
651 {
652 struct net *net = sock_net(skb->sk);
653 struct xfrm_state *x;
654 int err = -ESRCH;
655 struct km_event c;
656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
660
661 x = xfrm_user_state_lookup(net, p, attrs, &err);
662 if (x == NULL)
663 return err;
664
665 if ((err = security_xfrm_state_delete(x)) != 0)
666 goto out;
667
668 if (xfrm_state_kern(x)) {
669 err = -EPERM;
670 goto out;
671 }
672
673 err = xfrm_state_delete(x);
674
675 if (err < 0)
676 goto out;
677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
680 c.event = nlh->nlmsg_type;
681 km_state_notify(x, &c);
682
683 out:
684 security_task_getsecid(current, &sid);
685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
686 xfrm_state_put(x);
687 return err;
688 }
689
690 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691 {
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704 }
705
706 struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
711 };
712
713 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714 {
715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
717 int ctx_size = sizeof(*uctx) + s->ctx_len;
718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732 }
733
734 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735 {
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
745 strcpy(algo->alg_name, auth->alg_name);
746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750 }
751
752 /* Don't change this without updating xfrm_sa_len! */
753 static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
756 {
757 copy_to_user_state(x, p);
758
759 if (x->coaddr)
760 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
761
762 if (x->lastused)
763 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
764
765 if (x->aead)
766 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
767 if (x->aalg) {
768 if (copy_to_user_auth(x->aalg, skb))
769 goto nla_put_failure;
770
771 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
772 xfrm_alg_auth_len(x->aalg), x->aalg);
773 }
774 if (x->ealg)
775 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
776 if (x->calg)
777 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
778
779 if (x->encap)
780 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
781
782 if (x->tfcpad)
783 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);
784
785 if (xfrm_mark_put(skb, &x->mark))
786 goto nla_put_failure;
787
788 if (x->replay_esn)
789 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
790 xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn);
791
792 if (x->security && copy_sec_ctx(x->security, skb) < 0)
793 goto nla_put_failure;
794
795 return 0;
796
797 nla_put_failure:
798 return -EMSGSIZE;
799 }
800
801 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
802 {
803 struct xfrm_dump_info *sp = ptr;
804 struct sk_buff *in_skb = sp->in_skb;
805 struct sk_buff *skb = sp->out_skb;
806 struct xfrm_usersa_info *p;
807 struct nlmsghdr *nlh;
808 int err;
809
810 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
811 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
812 if (nlh == NULL)
813 return -EMSGSIZE;
814
815 p = nlmsg_data(nlh);
816
817 err = copy_to_user_state_extra(x, p, skb);
818 if (err)
819 goto nla_put_failure;
820
821 nlmsg_end(skb, nlh);
822 return 0;
823
824 nla_put_failure:
825 nlmsg_cancel(skb, nlh);
826 return err;
827 }
828
829 static int xfrm_dump_sa_done(struct netlink_callback *cb)
830 {
831 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
832 xfrm_state_walk_done(walk);
833 return 0;
834 }
835
836 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
837 {
838 struct net *net = sock_net(skb->sk);
839 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
840 struct xfrm_dump_info info;
841
842 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
843 sizeof(cb->args) - sizeof(cb->args[0]));
844
845 info.in_skb = cb->skb;
846 info.out_skb = skb;
847 info.nlmsg_seq = cb->nlh->nlmsg_seq;
848 info.nlmsg_flags = NLM_F_MULTI;
849
850 if (!cb->args[0]) {
851 cb->args[0] = 1;
852 xfrm_state_walk_init(walk, 0);
853 }
854
855 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
856
857 return skb->len;
858 }
859
860 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
861 struct xfrm_state *x, u32 seq)
862 {
863 struct xfrm_dump_info info;
864 struct sk_buff *skb;
865
866 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
867 if (!skb)
868 return ERR_PTR(-ENOMEM);
869
870 info.in_skb = in_skb;
871 info.out_skb = skb;
872 info.nlmsg_seq = seq;
873 info.nlmsg_flags = 0;
874
875 if (dump_one_state(x, 0, &info)) {
876 kfree_skb(skb);
877 return NULL;
878 }
879
880 return skb;
881 }
882
883 static inline size_t xfrm_spdinfo_msgsize(void)
884 {
885 return NLMSG_ALIGN(4)
886 + nla_total_size(sizeof(struct xfrmu_spdinfo))
887 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
888 }
889
890 static int build_spdinfo(struct sk_buff *skb, struct net *net,
891 u32 pid, u32 seq, u32 flags)
892 {
893 struct xfrmk_spdinfo si;
894 struct xfrmu_spdinfo spc;
895 struct xfrmu_spdhinfo sph;
896 struct nlmsghdr *nlh;
897 u32 *f;
898
899 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
900 if (nlh == NULL) /* shouldn't really happen ... */
901 return -EMSGSIZE;
902
903 f = nlmsg_data(nlh);
904 *f = flags;
905 xfrm_spd_getinfo(net, &si);
906 spc.incnt = si.incnt;
907 spc.outcnt = si.outcnt;
908 spc.fwdcnt = si.fwdcnt;
909 spc.inscnt = si.inscnt;
910 spc.outscnt = si.outscnt;
911 spc.fwdscnt = si.fwdscnt;
912 sph.spdhcnt = si.spdhcnt;
913 sph.spdhmcnt = si.spdhmcnt;
914
915 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
916 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
917
918 return nlmsg_end(skb, nlh);
919
920 nla_put_failure:
921 nlmsg_cancel(skb, nlh);
922 return -EMSGSIZE;
923 }
924
925 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
926 struct nlattr **attrs)
927 {
928 struct net *net = sock_net(skb->sk);
929 struct sk_buff *r_skb;
930 u32 *flags = nlmsg_data(nlh);
931 u32 spid = NETLINK_CB(skb).pid;
932 u32 seq = nlh->nlmsg_seq;
933
934 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
935 if (r_skb == NULL)
936 return -ENOMEM;
937
938 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
939 BUG();
940
941 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
942 }
943
944 static inline size_t xfrm_sadinfo_msgsize(void)
945 {
946 return NLMSG_ALIGN(4)
947 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
948 + nla_total_size(4); /* XFRMA_SAD_CNT */
949 }
950
951 static int build_sadinfo(struct sk_buff *skb, struct net *net,
952 u32 pid, u32 seq, u32 flags)
953 {
954 struct xfrmk_sadinfo si;
955 struct xfrmu_sadhinfo sh;
956 struct nlmsghdr *nlh;
957 u32 *f;
958
959 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
960 if (nlh == NULL) /* shouldn't really happen ... */
961 return -EMSGSIZE;
962
963 f = nlmsg_data(nlh);
964 *f = flags;
965 xfrm_sad_getinfo(net, &si);
966
967 sh.sadhmcnt = si.sadhmcnt;
968 sh.sadhcnt = si.sadhcnt;
969
970 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
971 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
972
973 return nlmsg_end(skb, nlh);
974
975 nla_put_failure:
976 nlmsg_cancel(skb, nlh);
977 return -EMSGSIZE;
978 }
979
980 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
981 struct nlattr **attrs)
982 {
983 struct net *net = sock_net(skb->sk);
984 struct sk_buff *r_skb;
985 u32 *flags = nlmsg_data(nlh);
986 u32 spid = NETLINK_CB(skb).pid;
987 u32 seq = nlh->nlmsg_seq;
988
989 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
990 if (r_skb == NULL)
991 return -ENOMEM;
992
993 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
994 BUG();
995
996 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
997 }
998
999 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1000 struct nlattr **attrs)
1001 {
1002 struct net *net = sock_net(skb->sk);
1003 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1004 struct xfrm_state *x;
1005 struct sk_buff *resp_skb;
1006 int err = -ESRCH;
1007
1008 x = xfrm_user_state_lookup(net, p, attrs, &err);
1009 if (x == NULL)
1010 goto out_noput;
1011
1012 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1013 if (IS_ERR(resp_skb)) {
1014 err = PTR_ERR(resp_skb);
1015 } else {
1016 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1017 }
1018 xfrm_state_put(x);
1019 out_noput:
1020 return err;
1021 }
1022
1023 static int verify_userspi_info(struct xfrm_userspi_info *p)
1024 {
1025 switch (p->info.id.proto) {
1026 case IPPROTO_AH:
1027 case IPPROTO_ESP:
1028 break;
1029
1030 case IPPROTO_COMP:
1031 /* IPCOMP spi is 16-bits. */
1032 if (p->max >= 0x10000)
1033 return -EINVAL;
1034 break;
1035
1036 default:
1037 return -EINVAL;
1038 }
1039
1040 if (p->min > p->max)
1041 return -EINVAL;
1042
1043 return 0;
1044 }
1045
1046 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1047 struct nlattr **attrs)
1048 {
1049 struct net *net = sock_net(skb->sk);
1050 struct xfrm_state *x;
1051 struct xfrm_userspi_info *p;
1052 struct sk_buff *resp_skb;
1053 xfrm_address_t *daddr;
1054 int family;
1055 int err;
1056 u32 mark;
1057 struct xfrm_mark m;
1058
1059 p = nlmsg_data(nlh);
1060 err = verify_userspi_info(p);
1061 if (err)
1062 goto out_noput;
1063
1064 family = p->info.family;
1065 daddr = &p->info.id.daddr;
1066
1067 x = NULL;
1068
1069 mark = xfrm_mark_get(attrs, &m);
1070 if (p->info.seq) {
1071 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1072 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1073 xfrm_state_put(x);
1074 x = NULL;
1075 }
1076 }
1077
1078 if (!x)
1079 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1080 p->info.id.proto, daddr,
1081 &p->info.saddr, 1,
1082 family);
1083 err = -ENOENT;
1084 if (x == NULL)
1085 goto out_noput;
1086
1087 err = xfrm_alloc_spi(x, p->min, p->max);
1088 if (err)
1089 goto out;
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 goto out;
1095 }
1096
1097 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1098
1099 out:
1100 xfrm_state_put(x);
1101 out_noput:
1102 return err;
1103 }
1104
1105 static int verify_policy_dir(u8 dir)
1106 {
1107 switch (dir) {
1108 case XFRM_POLICY_IN:
1109 case XFRM_POLICY_OUT:
1110 case XFRM_POLICY_FWD:
1111 break;
1112
1113 default:
1114 return -EINVAL;
1115 }
1116
1117 return 0;
1118 }
1119
1120 static int verify_policy_type(u8 type)
1121 {
1122 switch (type) {
1123 case XFRM_POLICY_TYPE_MAIN:
1124 #ifdef CONFIG_XFRM_SUB_POLICY
1125 case XFRM_POLICY_TYPE_SUB:
1126 #endif
1127 break;
1128
1129 default:
1130 return -EINVAL;
1131 }
1132
1133 return 0;
1134 }
1135
1136 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1137 {
1138 switch (p->share) {
1139 case XFRM_SHARE_ANY:
1140 case XFRM_SHARE_SESSION:
1141 case XFRM_SHARE_USER:
1142 case XFRM_SHARE_UNIQUE:
1143 break;
1144
1145 default:
1146 return -EINVAL;
1147 }
1148
1149 switch (p->action) {
1150 case XFRM_POLICY_ALLOW:
1151 case XFRM_POLICY_BLOCK:
1152 break;
1153
1154 default:
1155 return -EINVAL;
1156 }
1157
1158 switch (p->sel.family) {
1159 case AF_INET:
1160 break;
1161
1162 case AF_INET6:
1163 #if IS_ENABLED(CONFIG_IPV6)
1164 break;
1165 #else
1166 return -EAFNOSUPPORT;
1167 #endif
1168
1169 default:
1170 return -EINVAL;
1171 }
1172
1173 return verify_policy_dir(p->dir);
1174 }
1175
1176 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1177 {
1178 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1179 struct xfrm_user_sec_ctx *uctx;
1180
1181 if (!rt)
1182 return 0;
1183
1184 uctx = nla_data(rt);
1185 return security_xfrm_policy_alloc(&pol->security, uctx);
1186 }
1187
1188 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1189 int nr)
1190 {
1191 int i;
1192
1193 xp->xfrm_nr = nr;
1194 for (i = 0; i < nr; i++, ut++) {
1195 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1196
1197 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1198 memcpy(&t->saddr, &ut->saddr,
1199 sizeof(xfrm_address_t));
1200 t->reqid = ut->reqid;
1201 t->mode = ut->mode;
1202 t->share = ut->share;
1203 t->optional = ut->optional;
1204 t->aalgos = ut->aalgos;
1205 t->ealgos = ut->ealgos;
1206 t->calgos = ut->calgos;
1207 /* If all masks are ~0, then we allow all algorithms. */
1208 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1209 t->encap_family = ut->family;
1210 }
1211 }
1212
1213 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1214 {
1215 int i;
1216
1217 if (nr > XFRM_MAX_DEPTH)
1218 return -EINVAL;
1219
1220 for (i = 0; i < nr; i++) {
1221 /* We never validated the ut->family value, so many
1222 * applications simply leave it at zero. The check was
1223 * never made and ut->family was ignored because all
1224 * templates could be assumed to have the same family as
1225 * the policy itself. Now that we will have ipv4-in-ipv6
1226 * and ipv6-in-ipv4 tunnels, this is no longer true.
1227 */
1228 if (!ut[i].family)
1229 ut[i].family = family;
1230
1231 switch (ut[i].family) {
1232 case AF_INET:
1233 break;
1234 #if IS_ENABLED(CONFIG_IPV6)
1235 case AF_INET6:
1236 break;
1237 #endif
1238 default:
1239 return -EINVAL;
1240 }
1241 }
1242
1243 return 0;
1244 }
1245
1246 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1247 {
1248 struct nlattr *rt = attrs[XFRMA_TMPL];
1249
1250 if (!rt) {
1251 pol->xfrm_nr = 0;
1252 } else {
1253 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1254 int nr = nla_len(rt) / sizeof(*utmpl);
1255 int err;
1256
1257 err = validate_tmpl(nr, utmpl, pol->family);
1258 if (err)
1259 return err;
1260
1261 copy_templates(pol, utmpl, nr);
1262 }
1263 return 0;
1264 }
1265
1266 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1267 {
1268 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1269 struct xfrm_userpolicy_type *upt;
1270 u8 type = XFRM_POLICY_TYPE_MAIN;
1271 int err;
1272
1273 if (rt) {
1274 upt = nla_data(rt);
1275 type = upt->type;
1276 }
1277
1278 err = verify_policy_type(type);
1279 if (err)
1280 return err;
1281
1282 *tp = type;
1283 return 0;
1284 }
1285
1286 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1287 {
1288 xp->priority = p->priority;
1289 xp->index = p->index;
1290 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1291 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1292 xp->action = p->action;
1293 xp->flags = p->flags;
1294 xp->family = p->sel.family;
1295 /* XXX xp->share = p->share; */
1296 }
1297
1298 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1299 {
1300 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1301 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1302 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1303 p->priority = xp->priority;
1304 p->index = xp->index;
1305 p->sel.family = xp->family;
1306 p->dir = dir;
1307 p->action = xp->action;
1308 p->flags = xp->flags;
1309 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1310 }
1311
1312 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1313 {
1314 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1315 int err;
1316
1317 if (!xp) {
1318 *errp = -ENOMEM;
1319 return NULL;
1320 }
1321
1322 copy_from_user_policy(xp, p);
1323
1324 err = copy_from_user_policy_type(&xp->type, attrs);
1325 if (err)
1326 goto error;
1327
1328 if (!(err = copy_from_user_tmpl(xp, attrs)))
1329 err = copy_from_user_sec_ctx(xp, attrs);
1330 if (err)
1331 goto error;
1332
1333 xfrm_mark_get(attrs, &xp->mark);
1334
1335 return xp;
1336 error:
1337 *errp = err;
1338 xp->walk.dead = 1;
1339 xfrm_policy_destroy(xp);
1340 return NULL;
1341 }
1342
1343 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1344 struct nlattr **attrs)
1345 {
1346 struct net *net = sock_net(skb->sk);
1347 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1348 struct xfrm_policy *xp;
1349 struct km_event c;
1350 int err;
1351 int excl;
1352 uid_t loginuid = audit_get_loginuid(current);
1353 u32 sessionid = audit_get_sessionid(current);
1354 u32 sid;
1355
1356 err = verify_newpolicy_info(p);
1357 if (err)
1358 return err;
1359 err = verify_sec_ctx_len(attrs);
1360 if (err)
1361 return err;
1362
1363 xp = xfrm_policy_construct(net, p, attrs, &err);
1364 if (!xp)
1365 return err;
1366
1367 /* shouldn't excl be based on nlh flags??
1368 * Aha! this is anti-netlink really i.e more pfkey derived
1369 * in netlink excl is a flag and you wouldnt need
1370 * a type XFRM_MSG_UPDPOLICY - JHS */
1371 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1372 err = xfrm_policy_insert(p->dir, xp, excl);
1373 security_task_getsecid(current, &sid);
1374 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1375
1376 if (err) {
1377 security_xfrm_policy_free(xp->security);
1378 kfree(xp);
1379 return err;
1380 }
1381
1382 c.event = nlh->nlmsg_type;
1383 c.seq = nlh->nlmsg_seq;
1384 c.pid = nlh->nlmsg_pid;
1385 km_policy_notify(xp, p->dir, &c);
1386
1387 xfrm_pol_put(xp);
1388
1389 return 0;
1390 }
1391
1392 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1393 {
1394 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1395 int i;
1396
1397 if (xp->xfrm_nr == 0)
1398 return 0;
1399
1400 for (i = 0; i < xp->xfrm_nr; i++) {
1401 struct xfrm_user_tmpl *up = &vec[i];
1402 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1403
1404 memcpy(&up->id, &kp->id, sizeof(up->id));
1405 up->family = kp->encap_family;
1406 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1407 up->reqid = kp->reqid;
1408 up->mode = kp->mode;
1409 up->share = kp->share;
1410 up->optional = kp->optional;
1411 up->aalgos = kp->aalgos;
1412 up->ealgos = kp->ealgos;
1413 up->calgos = kp->calgos;
1414 }
1415
1416 return nla_put(skb, XFRMA_TMPL,
1417 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1418 }
1419
1420 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1421 {
1422 if (x->security) {
1423 return copy_sec_ctx(x->security, skb);
1424 }
1425 return 0;
1426 }
1427
1428 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1429 {
1430 if (xp->security) {
1431 return copy_sec_ctx(xp->security, skb);
1432 }
1433 return 0;
1434 }
1435 static inline size_t userpolicy_type_attrsize(void)
1436 {
1437 #ifdef CONFIG_XFRM_SUB_POLICY
1438 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1439 #else
1440 return 0;
1441 #endif
1442 }
1443
1444 #ifdef CONFIG_XFRM_SUB_POLICY
1445 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1446 {
1447 struct xfrm_userpolicy_type upt = {
1448 .type = type,
1449 };
1450
1451 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1452 }
1453
1454 #else
1455 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1456 {
1457 return 0;
1458 }
1459 #endif
1460
1461 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1462 {
1463 struct xfrm_dump_info *sp = ptr;
1464 struct xfrm_userpolicy_info *p;
1465 struct sk_buff *in_skb = sp->in_skb;
1466 struct sk_buff *skb = sp->out_skb;
1467 struct nlmsghdr *nlh;
1468
1469 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1470 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1471 if (nlh == NULL)
1472 return -EMSGSIZE;
1473
1474 p = nlmsg_data(nlh);
1475 copy_to_user_policy(xp, p, dir);
1476 if (copy_to_user_tmpl(xp, skb) < 0)
1477 goto nlmsg_failure;
1478 if (copy_to_user_sec_ctx(xp, skb))
1479 goto nlmsg_failure;
1480 if (copy_to_user_policy_type(xp->type, skb) < 0)
1481 goto nlmsg_failure;
1482 if (xfrm_mark_put(skb, &xp->mark))
1483 goto nla_put_failure;
1484
1485 nlmsg_end(skb, nlh);
1486 return 0;
1487
1488 nla_put_failure:
1489 nlmsg_failure:
1490 nlmsg_cancel(skb, nlh);
1491 return -EMSGSIZE;
1492 }
1493
1494 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1495 {
1496 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1497
1498 xfrm_policy_walk_done(walk);
1499 return 0;
1500 }
1501
1502 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1503 {
1504 struct net *net = sock_net(skb->sk);
1505 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1506 struct xfrm_dump_info info;
1507
1508 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1509 sizeof(cb->args) - sizeof(cb->args[0]));
1510
1511 info.in_skb = cb->skb;
1512 info.out_skb = skb;
1513 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1514 info.nlmsg_flags = NLM_F_MULTI;
1515
1516 if (!cb->args[0]) {
1517 cb->args[0] = 1;
1518 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1519 }
1520
1521 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1522
1523 return skb->len;
1524 }
1525
1526 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1527 struct xfrm_policy *xp,
1528 int dir, u32 seq)
1529 {
1530 struct xfrm_dump_info info;
1531 struct sk_buff *skb;
1532
1533 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1534 if (!skb)
1535 return ERR_PTR(-ENOMEM);
1536
1537 info.in_skb = in_skb;
1538 info.out_skb = skb;
1539 info.nlmsg_seq = seq;
1540 info.nlmsg_flags = 0;
1541
1542 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1543 kfree_skb(skb);
1544 return NULL;
1545 }
1546
1547 return skb;
1548 }
1549
1550 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1551 struct nlattr **attrs)
1552 {
1553 struct net *net = sock_net(skb->sk);
1554 struct xfrm_policy *xp;
1555 struct xfrm_userpolicy_id *p;
1556 u8 type = XFRM_POLICY_TYPE_MAIN;
1557 int err;
1558 struct km_event c;
1559 int delete;
1560 struct xfrm_mark m;
1561 u32 mark = xfrm_mark_get(attrs, &m);
1562
1563 p = nlmsg_data(nlh);
1564 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1565
1566 err = copy_from_user_policy_type(&type, attrs);
1567 if (err)
1568 return err;
1569
1570 err = verify_policy_dir(p->dir);
1571 if (err)
1572 return err;
1573
1574 if (p->index)
1575 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1576 else {
1577 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1578 struct xfrm_sec_ctx *ctx;
1579
1580 err = verify_sec_ctx_len(attrs);
1581 if (err)
1582 return err;
1583
1584 ctx = NULL;
1585 if (rt) {
1586 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1587
1588 err = security_xfrm_policy_alloc(&ctx, uctx);
1589 if (err)
1590 return err;
1591 }
1592 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1593 ctx, delete, &err);
1594 security_xfrm_policy_free(ctx);
1595 }
1596 if (xp == NULL)
1597 return -ENOENT;
1598
1599 if (!delete) {
1600 struct sk_buff *resp_skb;
1601
1602 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1603 if (IS_ERR(resp_skb)) {
1604 err = PTR_ERR(resp_skb);
1605 } else {
1606 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1607 NETLINK_CB(skb).pid);
1608 }
1609 } else {
1610 uid_t loginuid = audit_get_loginuid(current);
1611 u32 sessionid = audit_get_sessionid(current);
1612 u32 sid;
1613
1614 security_task_getsecid(current, &sid);
1615 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1616 sid);
1617
1618 if (err != 0)
1619 goto out;
1620
1621 c.data.byid = p->index;
1622 c.event = nlh->nlmsg_type;
1623 c.seq = nlh->nlmsg_seq;
1624 c.pid = nlh->nlmsg_pid;
1625 km_policy_notify(xp, p->dir, &c);
1626 }
1627
1628 out:
1629 xfrm_pol_put(xp);
1630 return err;
1631 }
1632
1633 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1634 struct nlattr **attrs)
1635 {
1636 struct net *net = sock_net(skb->sk);
1637 struct km_event c;
1638 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1639 struct xfrm_audit audit_info;
1640 int err;
1641
1642 audit_info.loginuid = audit_get_loginuid(current);
1643 audit_info.sessionid = audit_get_sessionid(current);
1644 security_task_getsecid(current, &audit_info.secid);
1645 err = xfrm_state_flush(net, p->proto, &audit_info);
1646 if (err) {
1647 if (err == -ESRCH) /* empty table */
1648 return 0;
1649 return err;
1650 }
1651 c.data.proto = p->proto;
1652 c.event = nlh->nlmsg_type;
1653 c.seq = nlh->nlmsg_seq;
1654 c.pid = nlh->nlmsg_pid;
1655 c.net = net;
1656 km_state_notify(NULL, &c);
1657
1658 return 0;
1659 }
1660
1661 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1662 {
1663 size_t replay_size = x->replay_esn ?
1664 xfrm_replay_state_esn_len(x->replay_esn) :
1665 sizeof(struct xfrm_replay_state);
1666
1667 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1668 + nla_total_size(replay_size)
1669 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1670 + nla_total_size(sizeof(struct xfrm_mark))
1671 + nla_total_size(4) /* XFRM_AE_RTHR */
1672 + nla_total_size(4); /* XFRM_AE_ETHR */
1673 }
1674
1675 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1676 {
1677 struct xfrm_aevent_id *id;
1678 struct nlmsghdr *nlh;
1679
1680 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1681 if (nlh == NULL)
1682 return -EMSGSIZE;
1683
1684 id = nlmsg_data(nlh);
1685 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1686 id->sa_id.spi = x->id.spi;
1687 id->sa_id.family = x->props.family;
1688 id->sa_id.proto = x->id.proto;
1689 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1690 id->reqid = x->props.reqid;
1691 id->flags = c->data.aevent;
1692
1693 if (x->replay_esn)
1694 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
1695 xfrm_replay_state_esn_len(x->replay_esn),
1696 x->replay_esn);
1697 else
1698 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1699
1700 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1701
1702 if (id->flags & XFRM_AE_RTHR)
1703 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1704
1705 if (id->flags & XFRM_AE_ETHR)
1706 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1707 x->replay_maxage * 10 / HZ);
1708
1709 if (xfrm_mark_put(skb, &x->mark))
1710 goto nla_put_failure;
1711
1712 return nlmsg_end(skb, nlh);
1713
1714 nla_put_failure:
1715 nlmsg_cancel(skb, nlh);
1716 return -EMSGSIZE;
1717 }
1718
1719 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1720 struct nlattr **attrs)
1721 {
1722 struct net *net = sock_net(skb->sk);
1723 struct xfrm_state *x;
1724 struct sk_buff *r_skb;
1725 int err;
1726 struct km_event c;
1727 u32 mark;
1728 struct xfrm_mark m;
1729 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1730 struct xfrm_usersa_id *id = &p->sa_id;
1731
1732 mark = xfrm_mark_get(attrs, &m);
1733
1734 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1735 if (x == NULL)
1736 return -ESRCH;
1737
1738 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1739 if (r_skb == NULL) {
1740 xfrm_state_put(x);
1741 return -ENOMEM;
1742 }
1743
1744 /*
1745 * XXX: is this lock really needed - none of the other
1746 * gets lock (the concern is things getting updated
1747 * while we are still reading) - jhs
1748 */
1749 spin_lock_bh(&x->lock);
1750 c.data.aevent = p->flags;
1751 c.seq = nlh->nlmsg_seq;
1752 c.pid = nlh->nlmsg_pid;
1753
1754 if (build_aevent(r_skb, x, &c) < 0)
1755 BUG();
1756 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1757 spin_unlock_bh(&x->lock);
1758 xfrm_state_put(x);
1759 return err;
1760 }
1761
1762 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1763 struct nlattr **attrs)
1764 {
1765 struct net *net = sock_net(skb->sk);
1766 struct xfrm_state *x;
1767 struct km_event c;
1768 int err = - EINVAL;
1769 u32 mark = 0;
1770 struct xfrm_mark m;
1771 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1772 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1773 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1774 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1775
1776 if (!lt && !rp && !re)
1777 return err;
1778
1779 /* pedantic mode - thou shalt sayeth replaceth */
1780 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1781 return err;
1782
1783 mark = xfrm_mark_get(attrs, &m);
1784
1785 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1786 if (x == NULL)
1787 return -ESRCH;
1788
1789 if (x->km.state != XFRM_STATE_VALID)
1790 goto out;
1791
1792 err = xfrm_replay_verify_len(x->replay_esn, rp);
1793 if (err)
1794 goto out;
1795
1796 spin_lock_bh(&x->lock);
1797 xfrm_update_ae_params(x, attrs);
1798 spin_unlock_bh(&x->lock);
1799
1800 c.event = nlh->nlmsg_type;
1801 c.seq = nlh->nlmsg_seq;
1802 c.pid = nlh->nlmsg_pid;
1803 c.data.aevent = XFRM_AE_CU;
1804 km_state_notify(x, &c);
1805 err = 0;
1806 out:
1807 xfrm_state_put(x);
1808 return err;
1809 }
1810
1811 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1812 struct nlattr **attrs)
1813 {
1814 struct net *net = sock_net(skb->sk);
1815 struct km_event c;
1816 u8 type = XFRM_POLICY_TYPE_MAIN;
1817 int err;
1818 struct xfrm_audit audit_info;
1819
1820 err = copy_from_user_policy_type(&type, attrs);
1821 if (err)
1822 return err;
1823
1824 audit_info.loginuid = audit_get_loginuid(current);
1825 audit_info.sessionid = audit_get_sessionid(current);
1826 security_task_getsecid(current, &audit_info.secid);
1827 err = xfrm_policy_flush(net, type, &audit_info);
1828 if (err) {
1829 if (err == -ESRCH) /* empty table */
1830 return 0;
1831 return err;
1832 }
1833
1834 c.data.type = type;
1835 c.event = nlh->nlmsg_type;
1836 c.seq = nlh->nlmsg_seq;
1837 c.pid = nlh->nlmsg_pid;
1838 c.net = net;
1839 km_policy_notify(NULL, 0, &c);
1840 return 0;
1841 }
1842
1843 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1844 struct nlattr **attrs)
1845 {
1846 struct net *net = sock_net(skb->sk);
1847 struct xfrm_policy *xp;
1848 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1849 struct xfrm_userpolicy_info *p = &up->pol;
1850 u8 type = XFRM_POLICY_TYPE_MAIN;
1851 int err = -ENOENT;
1852 struct xfrm_mark m;
1853 u32 mark = xfrm_mark_get(attrs, &m);
1854
1855 err = copy_from_user_policy_type(&type, attrs);
1856 if (err)
1857 return err;
1858
1859 err = verify_policy_dir(p->dir);
1860 if (err)
1861 return err;
1862
1863 if (p->index)
1864 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1865 else {
1866 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1867 struct xfrm_sec_ctx *ctx;
1868
1869 err = verify_sec_ctx_len(attrs);
1870 if (err)
1871 return err;
1872
1873 ctx = NULL;
1874 if (rt) {
1875 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1876
1877 err = security_xfrm_policy_alloc(&ctx, uctx);
1878 if (err)
1879 return err;
1880 }
1881 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1882 &p->sel, ctx, 0, &err);
1883 security_xfrm_policy_free(ctx);
1884 }
1885 if (xp == NULL)
1886 return -ENOENT;
1887
1888 if (unlikely(xp->walk.dead))
1889 goto out;
1890
1891 err = 0;
1892 if (up->hard) {
1893 uid_t loginuid = audit_get_loginuid(current);
1894 u32 sessionid = audit_get_sessionid(current);
1895 u32 sid;
1896
1897 security_task_getsecid(current, &sid);
1898 xfrm_policy_delete(xp, p->dir);
1899 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1900
1901 } else {
1902 // reset the timers here?
1903 WARN(1, "Dont know what to do with soft policy expire\n");
1904 }
1905 km_policy_expired(xp, p->dir, up->hard, current->pid);
1906
1907 out:
1908 xfrm_pol_put(xp);
1909 return err;
1910 }
1911
1912 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1913 struct nlattr **attrs)
1914 {
1915 struct net *net = sock_net(skb->sk);
1916 struct xfrm_state *x;
1917 int err;
1918 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1919 struct xfrm_usersa_info *p = &ue->state;
1920 struct xfrm_mark m;
1921 u32 mark = xfrm_mark_get(attrs, &m);
1922
1923 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1924
1925 err = -ENOENT;
1926 if (x == NULL)
1927 return err;
1928
1929 spin_lock_bh(&x->lock);
1930 err = -EINVAL;
1931 if (x->km.state != XFRM_STATE_VALID)
1932 goto out;
1933 km_state_expired(x, ue->hard, current->pid);
1934
1935 if (ue->hard) {
1936 uid_t loginuid = audit_get_loginuid(current);
1937 u32 sessionid = audit_get_sessionid(current);
1938 u32 sid;
1939
1940 security_task_getsecid(current, &sid);
1941 __xfrm_state_delete(x);
1942 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1943 }
1944 err = 0;
1945 out:
1946 spin_unlock_bh(&x->lock);
1947 xfrm_state_put(x);
1948 return err;
1949 }
1950
1951 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1952 struct nlattr **attrs)
1953 {
1954 struct net *net = sock_net(skb->sk);
1955 struct xfrm_policy *xp;
1956 struct xfrm_user_tmpl *ut;
1957 int i;
1958 struct nlattr *rt = attrs[XFRMA_TMPL];
1959 struct xfrm_mark mark;
1960
1961 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1962 struct xfrm_state *x = xfrm_state_alloc(net);
1963 int err = -ENOMEM;
1964
1965 if (!x)
1966 goto nomem;
1967
1968 xfrm_mark_get(attrs, &mark);
1969
1970 err = verify_newpolicy_info(&ua->policy);
1971 if (err)
1972 goto bad_policy;
1973
1974 /* build an XP */
1975 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1976 if (!xp)
1977 goto free_state;
1978
1979 memcpy(&x->id, &ua->id, sizeof(ua->id));
1980 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1981 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1982 xp->mark.m = x->mark.m = mark.m;
1983 xp->mark.v = x->mark.v = mark.v;
1984 ut = nla_data(rt);
1985 /* extract the templates and for each call km_key */
1986 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1987 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1988 memcpy(&x->id, &t->id, sizeof(x->id));
1989 x->props.mode = t->mode;
1990 x->props.reqid = t->reqid;
1991 x->props.family = ut->family;
1992 t->aalgos = ua->aalgos;
1993 t->ealgos = ua->ealgos;
1994 t->calgos = ua->calgos;
1995 err = km_query(x, t, xp);
1996
1997 }
1998
1999 kfree(x);
2000 kfree(xp);
2001
2002 return 0;
2003
2004 bad_policy:
2005 WARN(1, "BAD policy passed\n");
2006 free_state:
2007 kfree(x);
2008 nomem:
2009 return err;
2010 }
2011
2012 #ifdef CONFIG_XFRM_MIGRATE
2013 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2014 struct xfrm_kmaddress *k,
2015 struct nlattr **attrs, int *num)
2016 {
2017 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2018 struct xfrm_user_migrate *um;
2019 int i, num_migrate;
2020
2021 if (k != NULL) {
2022 struct xfrm_user_kmaddress *uk;
2023
2024 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2025 memcpy(&k->local, &uk->local, sizeof(k->local));
2026 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2027 k->family = uk->family;
2028 k->reserved = uk->reserved;
2029 }
2030
2031 um = nla_data(rt);
2032 num_migrate = nla_len(rt) / sizeof(*um);
2033
2034 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2035 return -EINVAL;
2036
2037 for (i = 0; i < num_migrate; i++, um++, ma++) {
2038 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2039 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2040 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2041 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2042
2043 ma->proto = um->proto;
2044 ma->mode = um->mode;
2045 ma->reqid = um->reqid;
2046
2047 ma->old_family = um->old_family;
2048 ma->new_family = um->new_family;
2049 }
2050
2051 *num = i;
2052 return 0;
2053 }
2054
2055 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2056 struct nlattr **attrs)
2057 {
2058 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2059 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2060 struct xfrm_kmaddress km, *kmp;
2061 u8 type;
2062 int err;
2063 int n = 0;
2064
2065 if (attrs[XFRMA_MIGRATE] == NULL)
2066 return -EINVAL;
2067
2068 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2069
2070 err = copy_from_user_policy_type(&type, attrs);
2071 if (err)
2072 return err;
2073
2074 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2075 if (err)
2076 return err;
2077
2078 if (!n)
2079 return 0;
2080
2081 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2082
2083 return 0;
2084 }
2085 #else
2086 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2087 struct nlattr **attrs)
2088 {
2089 return -ENOPROTOOPT;
2090 }
2091 #endif
2092
2093 #ifdef CONFIG_XFRM_MIGRATE
2094 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2095 {
2096 struct xfrm_user_migrate um;
2097
2098 memset(&um, 0, sizeof(um));
2099 um.proto = m->proto;
2100 um.mode = m->mode;
2101 um.reqid = m->reqid;
2102 um.old_family = m->old_family;
2103 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2104 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2105 um.new_family = m->new_family;
2106 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2107 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2108
2109 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2110 }
2111
2112 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2113 {
2114 struct xfrm_user_kmaddress uk;
2115
2116 memset(&uk, 0, sizeof(uk));
2117 uk.family = k->family;
2118 uk.reserved = k->reserved;
2119 memcpy(&uk.local, &k->local, sizeof(uk.local));
2120 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2121
2122 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2123 }
2124
2125 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2126 {
2127 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2128 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2129 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2130 + userpolicy_type_attrsize();
2131 }
2132
2133 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2134 int num_migrate, const struct xfrm_kmaddress *k,
2135 const struct xfrm_selector *sel, u8 dir, u8 type)
2136 {
2137 const struct xfrm_migrate *mp;
2138 struct xfrm_userpolicy_id *pol_id;
2139 struct nlmsghdr *nlh;
2140 int i;
2141
2142 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2143 if (nlh == NULL)
2144 return -EMSGSIZE;
2145
2146 pol_id = nlmsg_data(nlh);
2147 /* copy data from selector, dir, and type to the pol_id */
2148 memset(pol_id, 0, sizeof(*pol_id));
2149 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2150 pol_id->dir = dir;
2151
2152 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2153 goto nlmsg_failure;
2154
2155 if (copy_to_user_policy_type(type, skb) < 0)
2156 goto nlmsg_failure;
2157
2158 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2159 if (copy_to_user_migrate(mp, skb) < 0)
2160 goto nlmsg_failure;
2161 }
2162
2163 return nlmsg_end(skb, nlh);
2164 nlmsg_failure:
2165 nlmsg_cancel(skb, nlh);
2166 return -EMSGSIZE;
2167 }
2168
2169 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2170 const struct xfrm_migrate *m, int num_migrate,
2171 const struct xfrm_kmaddress *k)
2172 {
2173 struct net *net = &init_net;
2174 struct sk_buff *skb;
2175
2176 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2177 if (skb == NULL)
2178 return -ENOMEM;
2179
2180 /* build migrate */
2181 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2182 BUG();
2183
2184 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2185 }
2186 #else
2187 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2188 const struct xfrm_migrate *m, int num_migrate,
2189 const struct xfrm_kmaddress *k)
2190 {
2191 return -ENOPROTOOPT;
2192 }
2193 #endif
2194
2195 #define XMSGSIZE(type) sizeof(struct type)
2196
2197 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2198 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2199 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2200 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2201 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2202 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2203 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2204 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2205 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2206 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2207 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2208 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2209 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2210 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2211 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2212 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2213 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2214 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2215 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2216 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2217 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2218 };
2219
2220 #undef XMSGSIZE
2221
2222 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2223 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2224 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2225 [XFRMA_LASTUSED] = { .type = NLA_U64},
2226 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2227 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2228 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2229 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2230 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2231 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2232 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2233 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2234 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2235 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2236 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2237 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2238 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2239 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2240 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2241 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2242 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2243 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2244 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2245 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2246 };
2247
2248 static struct xfrm_link {
2249 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2250 int (*dump)(struct sk_buff *, struct netlink_callback *);
2251 int (*done)(struct netlink_callback *);
2252 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2253 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2254 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2255 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2256 .dump = xfrm_dump_sa,
2257 .done = xfrm_dump_sa_done },
2258 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2259 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2260 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2261 .dump = xfrm_dump_policy,
2262 .done = xfrm_dump_policy_done },
2263 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2264 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2265 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2266 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2267 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2268 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2269 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2270 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2271 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2272 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2273 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2274 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2275 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2276 };
2277
2278 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2279 {
2280 struct net *net = sock_net(skb->sk);
2281 struct nlattr *attrs[XFRMA_MAX+1];
2282 struct xfrm_link *link;
2283 int type, err;
2284
2285 type = nlh->nlmsg_type;
2286 if (type > XFRM_MSG_MAX)
2287 return -EINVAL;
2288
2289 type -= XFRM_MSG_BASE;
2290 link = &xfrm_dispatch[type];
2291
2292 /* All operations require privileges, even GET */
2293 if (!capable(CAP_NET_ADMIN))
2294 return -EPERM;
2295
2296 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2297 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2298 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2299 if (link->dump == NULL)
2300 return -EINVAL;
2301
2302 {
2303 struct netlink_dump_control c = {
2304 .dump = link->dump,
2305 .done = link->done,
2306 };
2307 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2308 }
2309 }
2310
2311 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2312 xfrma_policy);
2313 if (err < 0)
2314 return err;
2315
2316 if (link->doit == NULL)
2317 return -EINVAL;
2318
2319 return link->doit(skb, nlh, attrs);
2320 }
2321
2322 static void xfrm_netlink_rcv(struct sk_buff *skb)
2323 {
2324 mutex_lock(&xfrm_cfg_mutex);
2325 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2326 mutex_unlock(&xfrm_cfg_mutex);
2327 }
2328
2329 static inline size_t xfrm_expire_msgsize(void)
2330 {
2331 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2332 + nla_total_size(sizeof(struct xfrm_mark));
2333 }
2334
2335 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2336 {
2337 struct xfrm_user_expire *ue;
2338 struct nlmsghdr *nlh;
2339
2340 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2341 if (nlh == NULL)
2342 return -EMSGSIZE;
2343
2344 ue = nlmsg_data(nlh);
2345 copy_to_user_state(x, &ue->state);
2346 ue->hard = (c->data.hard != 0) ? 1 : 0;
2347
2348 if (xfrm_mark_put(skb, &x->mark))
2349 goto nla_put_failure;
2350
2351 return nlmsg_end(skb, nlh);
2352
2353 nla_put_failure:
2354 return -EMSGSIZE;
2355 }
2356
2357 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2358 {
2359 struct net *net = xs_net(x);
2360 struct sk_buff *skb;
2361
2362 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2363 if (skb == NULL)
2364 return -ENOMEM;
2365
2366 if (build_expire(skb, x, c) < 0) {
2367 kfree_skb(skb);
2368 return -EMSGSIZE;
2369 }
2370
2371 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2372 }
2373
2374 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2375 {
2376 struct net *net = xs_net(x);
2377 struct sk_buff *skb;
2378
2379 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2380 if (skb == NULL)
2381 return -ENOMEM;
2382
2383 if (build_aevent(skb, x, c) < 0)
2384 BUG();
2385
2386 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2387 }
2388
2389 static int xfrm_notify_sa_flush(const struct km_event *c)
2390 {
2391 struct net *net = c->net;
2392 struct xfrm_usersa_flush *p;
2393 struct nlmsghdr *nlh;
2394 struct sk_buff *skb;
2395 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2396
2397 skb = nlmsg_new(len, GFP_ATOMIC);
2398 if (skb == NULL)
2399 return -ENOMEM;
2400
2401 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2402 if (nlh == NULL) {
2403 kfree_skb(skb);
2404 return -EMSGSIZE;
2405 }
2406
2407 p = nlmsg_data(nlh);
2408 p->proto = c->data.proto;
2409
2410 nlmsg_end(skb, nlh);
2411
2412 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2413 }
2414
2415 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2416 {
2417 size_t l = 0;
2418 if (x->aead)
2419 l += nla_total_size(aead_len(x->aead));
2420 if (x->aalg) {
2421 l += nla_total_size(sizeof(struct xfrm_algo) +
2422 (x->aalg->alg_key_len + 7) / 8);
2423 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2424 }
2425 if (x->ealg)
2426 l += nla_total_size(xfrm_alg_len(x->ealg));
2427 if (x->calg)
2428 l += nla_total_size(sizeof(*x->calg));
2429 if (x->encap)
2430 l += nla_total_size(sizeof(*x->encap));
2431 if (x->tfcpad)
2432 l += nla_total_size(sizeof(x->tfcpad));
2433 if (x->replay_esn)
2434 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2435 if (x->security)
2436 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2437 x->security->ctx_len);
2438 if (x->coaddr)
2439 l += nla_total_size(sizeof(*x->coaddr));
2440
2441 /* Must count x->lastused as it may become non-zero behind our back. */
2442 l += nla_total_size(sizeof(u64));
2443
2444 return l;
2445 }
2446
2447 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2448 {
2449 struct net *net = xs_net(x);
2450 struct xfrm_usersa_info *p;
2451 struct xfrm_usersa_id *id;
2452 struct nlmsghdr *nlh;
2453 struct sk_buff *skb;
2454 int len = xfrm_sa_len(x);
2455 int headlen;
2456
2457 headlen = sizeof(*p);
2458 if (c->event == XFRM_MSG_DELSA) {
2459 len += nla_total_size(headlen);
2460 headlen = sizeof(*id);
2461 len += nla_total_size(sizeof(struct xfrm_mark));
2462 }
2463 len += NLMSG_ALIGN(headlen);
2464
2465 skb = nlmsg_new(len, GFP_ATOMIC);
2466 if (skb == NULL)
2467 return -ENOMEM;
2468
2469 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2470 if (nlh == NULL)
2471 goto nla_put_failure;
2472
2473 p = nlmsg_data(nlh);
2474 if (c->event == XFRM_MSG_DELSA) {
2475 struct nlattr *attr;
2476
2477 id = nlmsg_data(nlh);
2478 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2479 id->spi = x->id.spi;
2480 id->family = x->props.family;
2481 id->proto = x->id.proto;
2482
2483 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2484 if (attr == NULL)
2485 goto nla_put_failure;
2486
2487 p = nla_data(attr);
2488 }
2489
2490 if (copy_to_user_state_extra(x, p, skb))
2491 goto nla_put_failure;
2492
2493 nlmsg_end(skb, nlh);
2494
2495 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2496
2497 nla_put_failure:
2498 /* Somebody screwed up with xfrm_sa_len! */
2499 WARN_ON(1);
2500 kfree_skb(skb);
2501 return -1;
2502 }
2503
2504 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2505 {
2506
2507 switch (c->event) {
2508 case XFRM_MSG_EXPIRE:
2509 return xfrm_exp_state_notify(x, c);
2510 case XFRM_MSG_NEWAE:
2511 return xfrm_aevent_state_notify(x, c);
2512 case XFRM_MSG_DELSA:
2513 case XFRM_MSG_UPDSA:
2514 case XFRM_MSG_NEWSA:
2515 return xfrm_notify_sa(x, c);
2516 case XFRM_MSG_FLUSHSA:
2517 return xfrm_notify_sa_flush(c);
2518 default:
2519 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2520 c->event);
2521 break;
2522 }
2523
2524 return 0;
2525
2526 }
2527
2528 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2529 struct xfrm_policy *xp)
2530 {
2531 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2532 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2533 + nla_total_size(sizeof(struct xfrm_mark))
2534 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2535 + userpolicy_type_attrsize();
2536 }
2537
2538 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2539 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2540 int dir)
2541 {
2542 struct xfrm_user_acquire *ua;
2543 struct nlmsghdr *nlh;
2544 __u32 seq = xfrm_get_acqseq();
2545
2546 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2547 if (nlh == NULL)
2548 return -EMSGSIZE;
2549
2550 ua = nlmsg_data(nlh);
2551 memcpy(&ua->id, &x->id, sizeof(ua->id));
2552 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2553 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2554 copy_to_user_policy(xp, &ua->policy, dir);
2555 ua->aalgos = xt->aalgos;
2556 ua->ealgos = xt->ealgos;
2557 ua->calgos = xt->calgos;
2558 ua->seq = x->km.seq = seq;
2559
2560 if (copy_to_user_tmpl(xp, skb) < 0)
2561 goto nlmsg_failure;
2562 if (copy_to_user_state_sec_ctx(x, skb))
2563 goto nlmsg_failure;
2564 if (copy_to_user_policy_type(xp->type, skb) < 0)
2565 goto nlmsg_failure;
2566 if (xfrm_mark_put(skb, &xp->mark))
2567 goto nla_put_failure;
2568
2569 return nlmsg_end(skb, nlh);
2570
2571 nla_put_failure:
2572 nlmsg_failure:
2573 nlmsg_cancel(skb, nlh);
2574 return -EMSGSIZE;
2575 }
2576
2577 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2578 struct xfrm_policy *xp, int dir)
2579 {
2580 struct net *net = xs_net(x);
2581 struct sk_buff *skb;
2582
2583 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2584 if (skb == NULL)
2585 return -ENOMEM;
2586
2587 if (build_acquire(skb, x, xt, xp, dir) < 0)
2588 BUG();
2589
2590 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2591 }
2592
2593 /* User gives us xfrm_user_policy_info followed by an array of 0
2594 * or more templates.
2595 */
2596 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2597 u8 *data, int len, int *dir)
2598 {
2599 struct net *net = sock_net(sk);
2600 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2601 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2602 struct xfrm_policy *xp;
2603 int nr;
2604
2605 switch (sk->sk_family) {
2606 case AF_INET:
2607 if (opt != IP_XFRM_POLICY) {
2608 *dir = -EOPNOTSUPP;
2609 return NULL;
2610 }
2611 break;
2612 #if IS_ENABLED(CONFIG_IPV6)
2613 case AF_INET6:
2614 if (opt != IPV6_XFRM_POLICY) {
2615 *dir = -EOPNOTSUPP;
2616 return NULL;
2617 }
2618 break;
2619 #endif
2620 default:
2621 *dir = -EINVAL;
2622 return NULL;
2623 }
2624
2625 *dir = -EINVAL;
2626
2627 if (len < sizeof(*p) ||
2628 verify_newpolicy_info(p))
2629 return NULL;
2630
2631 nr = ((len - sizeof(*p)) / sizeof(*ut));
2632 if (validate_tmpl(nr, ut, p->sel.family))
2633 return NULL;
2634
2635 if (p->dir > XFRM_POLICY_OUT)
2636 return NULL;
2637
2638 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2639 if (xp == NULL) {
2640 *dir = -ENOBUFS;
2641 return NULL;
2642 }
2643
2644 copy_from_user_policy(xp, p);
2645 xp->type = XFRM_POLICY_TYPE_MAIN;
2646 copy_templates(xp, ut, nr);
2647
2648 *dir = p->dir;
2649
2650 return xp;
2651 }
2652
2653 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2654 {
2655 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2656 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2657 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2658 + nla_total_size(sizeof(struct xfrm_mark))
2659 + userpolicy_type_attrsize();
2660 }
2661
2662 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2663 int dir, const struct km_event *c)
2664 {
2665 struct xfrm_user_polexpire *upe;
2666 struct nlmsghdr *nlh;
2667 int hard = c->data.hard;
2668
2669 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2670 if (nlh == NULL)
2671 return -EMSGSIZE;
2672
2673 upe = nlmsg_data(nlh);
2674 copy_to_user_policy(xp, &upe->pol, dir);
2675 if (copy_to_user_tmpl(xp, skb) < 0)
2676 goto nlmsg_failure;
2677 if (copy_to_user_sec_ctx(xp, skb))
2678 goto nlmsg_failure;
2679 if (copy_to_user_policy_type(xp->type, skb) < 0)
2680 goto nlmsg_failure;
2681 if (xfrm_mark_put(skb, &xp->mark))
2682 goto nla_put_failure;
2683 upe->hard = !!hard;
2684
2685 return nlmsg_end(skb, nlh);
2686
2687 nla_put_failure:
2688 nlmsg_failure:
2689 nlmsg_cancel(skb, nlh);
2690 return -EMSGSIZE;
2691 }
2692
2693 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2694 {
2695 struct net *net = xp_net(xp);
2696 struct sk_buff *skb;
2697
2698 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2699 if (skb == NULL)
2700 return -ENOMEM;
2701
2702 if (build_polexpire(skb, xp, dir, c) < 0)
2703 BUG();
2704
2705 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2706 }
2707
2708 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2709 {
2710 struct net *net = xp_net(xp);
2711 struct xfrm_userpolicy_info *p;
2712 struct xfrm_userpolicy_id *id;
2713 struct nlmsghdr *nlh;
2714 struct sk_buff *skb;
2715 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2716 int headlen;
2717
2718 headlen = sizeof(*p);
2719 if (c->event == XFRM_MSG_DELPOLICY) {
2720 len += nla_total_size(headlen);
2721 headlen = sizeof(*id);
2722 }
2723 len += userpolicy_type_attrsize();
2724 len += nla_total_size(sizeof(struct xfrm_mark));
2725 len += NLMSG_ALIGN(headlen);
2726
2727 skb = nlmsg_new(len, GFP_ATOMIC);
2728 if (skb == NULL)
2729 return -ENOMEM;
2730
2731 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2732 if (nlh == NULL)
2733 goto nlmsg_failure;
2734
2735 p = nlmsg_data(nlh);
2736 if (c->event == XFRM_MSG_DELPOLICY) {
2737 struct nlattr *attr;
2738
2739 id = nlmsg_data(nlh);
2740 memset(id, 0, sizeof(*id));
2741 id->dir = dir;
2742 if (c->data.byid)
2743 id->index = xp->index;
2744 else
2745 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2746
2747 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2748 if (attr == NULL)
2749 goto nlmsg_failure;
2750
2751 p = nla_data(attr);
2752 }
2753
2754 copy_to_user_policy(xp, p, dir);
2755 if (copy_to_user_tmpl(xp, skb) < 0)
2756 goto nlmsg_failure;
2757 if (copy_to_user_policy_type(xp->type, skb) < 0)
2758 goto nlmsg_failure;
2759
2760 if (xfrm_mark_put(skb, &xp->mark))
2761 goto nla_put_failure;
2762
2763 nlmsg_end(skb, nlh);
2764
2765 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2766
2767 nla_put_failure:
2768 nlmsg_failure:
2769 kfree_skb(skb);
2770 return -1;
2771 }
2772
2773 static int xfrm_notify_policy_flush(const struct km_event *c)
2774 {
2775 struct net *net = c->net;
2776 struct nlmsghdr *nlh;
2777 struct sk_buff *skb;
2778
2779 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2780 if (skb == NULL)
2781 return -ENOMEM;
2782
2783 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2784 if (nlh == NULL)
2785 goto nlmsg_failure;
2786 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2787 goto nlmsg_failure;
2788
2789 nlmsg_end(skb, nlh);
2790
2791 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2792
2793 nlmsg_failure:
2794 kfree_skb(skb);
2795 return -1;
2796 }
2797
2798 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2799 {
2800
2801 switch (c->event) {
2802 case XFRM_MSG_NEWPOLICY:
2803 case XFRM_MSG_UPDPOLICY:
2804 case XFRM_MSG_DELPOLICY:
2805 return xfrm_notify_policy(xp, dir, c);
2806 case XFRM_MSG_FLUSHPOLICY:
2807 return xfrm_notify_policy_flush(c);
2808 case XFRM_MSG_POLEXPIRE:
2809 return xfrm_exp_policy_notify(xp, dir, c);
2810 default:
2811 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2812 c->event);
2813 }
2814
2815 return 0;
2816
2817 }
2818
2819 static inline size_t xfrm_report_msgsize(void)
2820 {
2821 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2822 }
2823
2824 static int build_report(struct sk_buff *skb, u8 proto,
2825 struct xfrm_selector *sel, xfrm_address_t *addr)
2826 {
2827 struct xfrm_user_report *ur;
2828 struct nlmsghdr *nlh;
2829
2830 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2831 if (nlh == NULL)
2832 return -EMSGSIZE;
2833
2834 ur = nlmsg_data(nlh);
2835 ur->proto = proto;
2836 memcpy(&ur->sel, sel, sizeof(ur->sel));
2837
2838 if (addr)
2839 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2840
2841 return nlmsg_end(skb, nlh);
2842
2843 nla_put_failure:
2844 nlmsg_cancel(skb, nlh);
2845 return -EMSGSIZE;
2846 }
2847
2848 static int xfrm_send_report(struct net *net, u8 proto,
2849 struct xfrm_selector *sel, xfrm_address_t *addr)
2850 {
2851 struct sk_buff *skb;
2852
2853 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2854 if (skb == NULL)
2855 return -ENOMEM;
2856
2857 if (build_report(skb, proto, sel, addr) < 0)
2858 BUG();
2859
2860 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2861 }
2862
2863 static inline size_t xfrm_mapping_msgsize(void)
2864 {
2865 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2866 }
2867
2868 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2869 xfrm_address_t *new_saddr, __be16 new_sport)
2870 {
2871 struct xfrm_user_mapping *um;
2872 struct nlmsghdr *nlh;
2873
2874 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2875 if (nlh == NULL)
2876 return -EMSGSIZE;
2877
2878 um = nlmsg_data(nlh);
2879
2880 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2881 um->id.spi = x->id.spi;
2882 um->id.family = x->props.family;
2883 um->id.proto = x->id.proto;
2884 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2885 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2886 um->new_sport = new_sport;
2887 um->old_sport = x->encap->encap_sport;
2888 um->reqid = x->props.reqid;
2889
2890 return nlmsg_end(skb, nlh);
2891 }
2892
2893 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2894 __be16 sport)
2895 {
2896 struct net *net = xs_net(x);
2897 struct sk_buff *skb;
2898
2899 if (x->id.proto != IPPROTO_ESP)
2900 return -EINVAL;
2901
2902 if (!x->encap)
2903 return -EINVAL;
2904
2905 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2906 if (skb == NULL)
2907 return -ENOMEM;
2908
2909 if (build_mapping(skb, x, ipaddr, sport) < 0)
2910 BUG();
2911
2912 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2913 }
2914
2915 static struct xfrm_mgr netlink_mgr = {
2916 .id = "netlink",
2917 .notify = xfrm_send_state_notify,
2918 .acquire = xfrm_send_acquire,
2919 .compile_policy = xfrm_compile_policy,
2920 .notify_policy = xfrm_send_policy_notify,
2921 .report = xfrm_send_report,
2922 .migrate = xfrm_send_migrate,
2923 .new_mapping = xfrm_send_mapping,
2924 };
2925
2926 static int __net_init xfrm_user_net_init(struct net *net)
2927 {
2928 struct sock *nlsk;
2929
2930 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2931 xfrm_netlink_rcv, NULL, THIS_MODULE);
2932 if (nlsk == NULL)
2933 return -ENOMEM;
2934 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2935 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2936 return 0;
2937 }
2938
2939 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2940 {
2941 struct net *net;
2942 list_for_each_entry(net, net_exit_list, exit_list)
2943 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2944 synchronize_net();
2945 list_for_each_entry(net, net_exit_list, exit_list)
2946 netlink_kernel_release(net->xfrm.nlsk_stash);
2947 }
2948
2949 static struct pernet_operations xfrm_user_net_ops = {
2950 .init = xfrm_user_net_init,
2951 .exit_batch = xfrm_user_net_exit,
2952 };
2953
2954 static int __init xfrm_user_init(void)
2955 {
2956 int rv;
2957
2958 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2959
2960 rv = register_pernet_subsys(&xfrm_user_net_ops);
2961 if (rv < 0)
2962 return rv;
2963 rv = xfrm_register_km(&netlink_mgr);
2964 if (rv < 0)
2965 unregister_pernet_subsys(&xfrm_user_net_ops);
2966 return rv;
2967 }
2968
2969 static void __exit xfrm_user_exit(void)
2970 {
2971 xfrm_unregister_km(&netlink_mgr);
2972 unregister_pernet_subsys(&xfrm_user_net_ops);
2973 }
2974
2975 module_init(xfrm_user_init);
2976 module_exit(xfrm_user_exit);
2977 MODULE_LICENSE("GPL");
2978 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2979
Linux kernel - Deliverables
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