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Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
[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 goto nla_put_failure;
762
763 if (x->lastused &&
764 nla_put_u64(skb, XFRMA_LASTUSED, x->lastused))
765 goto nla_put_failure;
766
767 if (x->aead &&
768 nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead))
769 goto nla_put_failure;
770
771 if (x->aalg &&
772 (copy_to_user_auth(x->aalg, skb) ||
773 nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
774 xfrm_alg_auth_len(x->aalg), x->aalg)))
775 goto nla_put_failure;
776
777 if (x->ealg &&
778 nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg))
779 goto nla_put_failure;
780
781 if (x->calg &&
782 nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg))
783 goto nla_put_failure;
784
785 if (x->encap &&
786 nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap))
787 goto nla_put_failure;
788
789 if (x->tfcpad &&
790 nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad))
791 goto nla_put_failure;
792
793 if (xfrm_mark_put(skb, &x->mark))
794 goto nla_put_failure;
795
796 if (x->replay_esn &&
797 nla_put(skb, XFRMA_REPLAY_ESN_VAL,
798 xfrm_replay_state_esn_len(x->replay_esn),
799 x->replay_esn))
800 goto nla_put_failure;
801
802 if (x->security && copy_sec_ctx(x->security, skb))
803 goto nla_put_failure;
804
805 return 0;
806
807 nla_put_failure:
808 return -EMSGSIZE;
809 }
810
811 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
812 {
813 struct xfrm_dump_info *sp = ptr;
814 struct sk_buff *in_skb = sp->in_skb;
815 struct sk_buff *skb = sp->out_skb;
816 struct xfrm_usersa_info *p;
817 struct nlmsghdr *nlh;
818 int err;
819
820 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
821 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
822 if (nlh == NULL)
823 return -EMSGSIZE;
824
825 p = nlmsg_data(nlh);
826
827 err = copy_to_user_state_extra(x, p, skb);
828 if (err)
829 goto nla_put_failure;
830
831 nlmsg_end(skb, nlh);
832 return 0;
833
834 nla_put_failure:
835 nlmsg_cancel(skb, nlh);
836 return err;
837 }
838
839 static int xfrm_dump_sa_done(struct netlink_callback *cb)
840 {
841 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
842 xfrm_state_walk_done(walk);
843 return 0;
844 }
845
846 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
847 {
848 struct net *net = sock_net(skb->sk);
849 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
850 struct xfrm_dump_info info;
851
852 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
853 sizeof(cb->args) - sizeof(cb->args[0]));
854
855 info.in_skb = cb->skb;
856 info.out_skb = skb;
857 info.nlmsg_seq = cb->nlh->nlmsg_seq;
858 info.nlmsg_flags = NLM_F_MULTI;
859
860 if (!cb->args[0]) {
861 cb->args[0] = 1;
862 xfrm_state_walk_init(walk, 0);
863 }
864
865 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
866
867 return skb->len;
868 }
869
870 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
871 struct xfrm_state *x, u32 seq)
872 {
873 struct xfrm_dump_info info;
874 struct sk_buff *skb;
875
876 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
877 if (!skb)
878 return ERR_PTR(-ENOMEM);
879
880 info.in_skb = in_skb;
881 info.out_skb = skb;
882 info.nlmsg_seq = seq;
883 info.nlmsg_flags = 0;
884
885 if (dump_one_state(x, 0, &info)) {
886 kfree_skb(skb);
887 return NULL;
888 }
889
890 return skb;
891 }
892
893 static inline size_t xfrm_spdinfo_msgsize(void)
894 {
895 return NLMSG_ALIGN(4)
896 + nla_total_size(sizeof(struct xfrmu_spdinfo))
897 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
898 }
899
900 static int build_spdinfo(struct sk_buff *skb, struct net *net,
901 u32 pid, u32 seq, u32 flags)
902 {
903 struct xfrmk_spdinfo si;
904 struct xfrmu_spdinfo spc;
905 struct xfrmu_spdhinfo sph;
906 struct nlmsghdr *nlh;
907 u32 *f;
908
909 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
910 if (nlh == NULL) /* shouldn't really happen ... */
911 return -EMSGSIZE;
912
913 f = nlmsg_data(nlh);
914 *f = flags;
915 xfrm_spd_getinfo(net, &si);
916 spc.incnt = si.incnt;
917 spc.outcnt = si.outcnt;
918 spc.fwdcnt = si.fwdcnt;
919 spc.inscnt = si.inscnt;
920 spc.outscnt = si.outscnt;
921 spc.fwdscnt = si.fwdscnt;
922 sph.spdhcnt = si.spdhcnt;
923 sph.spdhmcnt = si.spdhmcnt;
924
925 if (nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc) ||
926 nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph))
927 goto nla_put_failure;
928
929 return nlmsg_end(skb, nlh);
930
931 nla_put_failure:
932 nlmsg_cancel(skb, nlh);
933 return -EMSGSIZE;
934 }
935
936 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
937 struct nlattr **attrs)
938 {
939 struct net *net = sock_net(skb->sk);
940 struct sk_buff *r_skb;
941 u32 *flags = nlmsg_data(nlh);
942 u32 spid = NETLINK_CB(skb).pid;
943 u32 seq = nlh->nlmsg_seq;
944
945 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
946 if (r_skb == NULL)
947 return -ENOMEM;
948
949 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
950 BUG();
951
952 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
953 }
954
955 static inline size_t xfrm_sadinfo_msgsize(void)
956 {
957 return NLMSG_ALIGN(4)
958 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
959 + nla_total_size(4); /* XFRMA_SAD_CNT */
960 }
961
962 static int build_sadinfo(struct sk_buff *skb, struct net *net,
963 u32 pid, u32 seq, u32 flags)
964 {
965 struct xfrmk_sadinfo si;
966 struct xfrmu_sadhinfo sh;
967 struct nlmsghdr *nlh;
968 u32 *f;
969
970 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
971 if (nlh == NULL) /* shouldn't really happen ... */
972 return -EMSGSIZE;
973
974 f = nlmsg_data(nlh);
975 *f = flags;
976 xfrm_sad_getinfo(net, &si);
977
978 sh.sadhmcnt = si.sadhmcnt;
979 sh.sadhcnt = si.sadhcnt;
980
981 if (nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt) ||
982 nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh))
983 goto nla_put_failure;
984
985 return nlmsg_end(skb, nlh);
986
987 nla_put_failure:
988 nlmsg_cancel(skb, nlh);
989 return -EMSGSIZE;
990 }
991
992 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
993 struct nlattr **attrs)
994 {
995 struct net *net = sock_net(skb->sk);
996 struct sk_buff *r_skb;
997 u32 *flags = nlmsg_data(nlh);
998 u32 spid = NETLINK_CB(skb).pid;
999 u32 seq = nlh->nlmsg_seq;
1000
1001 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1002 if (r_skb == NULL)
1003 return -ENOMEM;
1004
1005 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
1006 BUG();
1007
1008 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
1009 }
1010
1011 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1012 struct nlattr **attrs)
1013 {
1014 struct net *net = sock_net(skb->sk);
1015 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1016 struct xfrm_state *x;
1017 struct sk_buff *resp_skb;
1018 int err = -ESRCH;
1019
1020 x = xfrm_user_state_lookup(net, p, attrs, &err);
1021 if (x == NULL)
1022 goto out_noput;
1023
1024 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1025 if (IS_ERR(resp_skb)) {
1026 err = PTR_ERR(resp_skb);
1027 } else {
1028 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1029 }
1030 xfrm_state_put(x);
1031 out_noput:
1032 return err;
1033 }
1034
1035 static int verify_userspi_info(struct xfrm_userspi_info *p)
1036 {
1037 switch (p->info.id.proto) {
1038 case IPPROTO_AH:
1039 case IPPROTO_ESP:
1040 break;
1041
1042 case IPPROTO_COMP:
1043 /* IPCOMP spi is 16-bits. */
1044 if (p->max >= 0x10000)
1045 return -EINVAL;
1046 break;
1047
1048 default:
1049 return -EINVAL;
1050 }
1051
1052 if (p->min > p->max)
1053 return -EINVAL;
1054
1055 return 0;
1056 }
1057
1058 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1059 struct nlattr **attrs)
1060 {
1061 struct net *net = sock_net(skb->sk);
1062 struct xfrm_state *x;
1063 struct xfrm_userspi_info *p;
1064 struct sk_buff *resp_skb;
1065 xfrm_address_t *daddr;
1066 int family;
1067 int err;
1068 u32 mark;
1069 struct xfrm_mark m;
1070
1071 p = nlmsg_data(nlh);
1072 err = verify_userspi_info(p);
1073 if (err)
1074 goto out_noput;
1075
1076 family = p->info.family;
1077 daddr = &p->info.id.daddr;
1078
1079 x = NULL;
1080
1081 mark = xfrm_mark_get(attrs, &m);
1082 if (p->info.seq) {
1083 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1084 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1085 xfrm_state_put(x);
1086 x = NULL;
1087 }
1088 }
1089
1090 if (!x)
1091 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1092 p->info.id.proto, daddr,
1093 &p->info.saddr, 1,
1094 family);
1095 err = -ENOENT;
1096 if (x == NULL)
1097 goto out_noput;
1098
1099 err = xfrm_alloc_spi(x, p->min, p->max);
1100 if (err)
1101 goto out;
1102
1103 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1104 if (IS_ERR(resp_skb)) {
1105 err = PTR_ERR(resp_skb);
1106 goto out;
1107 }
1108
1109 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1110
1111 out:
1112 xfrm_state_put(x);
1113 out_noput:
1114 return err;
1115 }
1116
1117 static int verify_policy_dir(u8 dir)
1118 {
1119 switch (dir) {
1120 case XFRM_POLICY_IN:
1121 case XFRM_POLICY_OUT:
1122 case XFRM_POLICY_FWD:
1123 break;
1124
1125 default:
1126 return -EINVAL;
1127 }
1128
1129 return 0;
1130 }
1131
1132 static int verify_policy_type(u8 type)
1133 {
1134 switch (type) {
1135 case XFRM_POLICY_TYPE_MAIN:
1136 #ifdef CONFIG_XFRM_SUB_POLICY
1137 case XFRM_POLICY_TYPE_SUB:
1138 #endif
1139 break;
1140
1141 default:
1142 return -EINVAL;
1143 }
1144
1145 return 0;
1146 }
1147
1148 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1149 {
1150 switch (p->share) {
1151 case XFRM_SHARE_ANY:
1152 case XFRM_SHARE_SESSION:
1153 case XFRM_SHARE_USER:
1154 case XFRM_SHARE_UNIQUE:
1155 break;
1156
1157 default:
1158 return -EINVAL;
1159 }
1160
1161 switch (p->action) {
1162 case XFRM_POLICY_ALLOW:
1163 case XFRM_POLICY_BLOCK:
1164 break;
1165
1166 default:
1167 return -EINVAL;
1168 }
1169
1170 switch (p->sel.family) {
1171 case AF_INET:
1172 break;
1173
1174 case AF_INET6:
1175 #if IS_ENABLED(CONFIG_IPV6)
1176 break;
1177 #else
1178 return -EAFNOSUPPORT;
1179 #endif
1180
1181 default:
1182 return -EINVAL;
1183 }
1184
1185 return verify_policy_dir(p->dir);
1186 }
1187
1188 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1189 {
1190 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1191 struct xfrm_user_sec_ctx *uctx;
1192
1193 if (!rt)
1194 return 0;
1195
1196 uctx = nla_data(rt);
1197 return security_xfrm_policy_alloc(&pol->security, uctx);
1198 }
1199
1200 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1201 int nr)
1202 {
1203 int i;
1204
1205 xp->xfrm_nr = nr;
1206 for (i = 0; i < nr; i++, ut++) {
1207 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1208
1209 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1210 memcpy(&t->saddr, &ut->saddr,
1211 sizeof(xfrm_address_t));
1212 t->reqid = ut->reqid;
1213 t->mode = ut->mode;
1214 t->share = ut->share;
1215 t->optional = ut->optional;
1216 t->aalgos = ut->aalgos;
1217 t->ealgos = ut->ealgos;
1218 t->calgos = ut->calgos;
1219 /* If all masks are ~0, then we allow all algorithms. */
1220 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1221 t->encap_family = ut->family;
1222 }
1223 }
1224
1225 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1226 {
1227 int i;
1228
1229 if (nr > XFRM_MAX_DEPTH)
1230 return -EINVAL;
1231
1232 for (i = 0; i < nr; i++) {
1233 /* We never validated the ut->family value, so many
1234 * applications simply leave it at zero. The check was
1235 * never made and ut->family was ignored because all
1236 * templates could be assumed to have the same family as
1237 * the policy itself. Now that we will have ipv4-in-ipv6
1238 * and ipv6-in-ipv4 tunnels, this is no longer true.
1239 */
1240 if (!ut[i].family)
1241 ut[i].family = family;
1242
1243 switch (ut[i].family) {
1244 case AF_INET:
1245 break;
1246 #if IS_ENABLED(CONFIG_IPV6)
1247 case AF_INET6:
1248 break;
1249 #endif
1250 default:
1251 return -EINVAL;
1252 }
1253 }
1254
1255 return 0;
1256 }
1257
1258 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1259 {
1260 struct nlattr *rt = attrs[XFRMA_TMPL];
1261
1262 if (!rt) {
1263 pol->xfrm_nr = 0;
1264 } else {
1265 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1266 int nr = nla_len(rt) / sizeof(*utmpl);
1267 int err;
1268
1269 err = validate_tmpl(nr, utmpl, pol->family);
1270 if (err)
1271 return err;
1272
1273 copy_templates(pol, utmpl, nr);
1274 }
1275 return 0;
1276 }
1277
1278 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1279 {
1280 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1281 struct xfrm_userpolicy_type *upt;
1282 u8 type = XFRM_POLICY_TYPE_MAIN;
1283 int err;
1284
1285 if (rt) {
1286 upt = nla_data(rt);
1287 type = upt->type;
1288 }
1289
1290 err = verify_policy_type(type);
1291 if (err)
1292 return err;
1293
1294 *tp = type;
1295 return 0;
1296 }
1297
1298 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1299 {
1300 xp->priority = p->priority;
1301 xp->index = p->index;
1302 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1303 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1304 xp->action = p->action;
1305 xp->flags = p->flags;
1306 xp->family = p->sel.family;
1307 /* XXX xp->share = p->share; */
1308 }
1309
1310 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1311 {
1312 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1313 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1314 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1315 p->priority = xp->priority;
1316 p->index = xp->index;
1317 p->sel.family = xp->family;
1318 p->dir = dir;
1319 p->action = xp->action;
1320 p->flags = xp->flags;
1321 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1322 }
1323
1324 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1325 {
1326 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1327 int err;
1328
1329 if (!xp) {
1330 *errp = -ENOMEM;
1331 return NULL;
1332 }
1333
1334 copy_from_user_policy(xp, p);
1335
1336 err = copy_from_user_policy_type(&xp->type, attrs);
1337 if (err)
1338 goto error;
1339
1340 if (!(err = copy_from_user_tmpl(xp, attrs)))
1341 err = copy_from_user_sec_ctx(xp, attrs);
1342 if (err)
1343 goto error;
1344
1345 xfrm_mark_get(attrs, &xp->mark);
1346
1347 return xp;
1348 error:
1349 *errp = err;
1350 xp->walk.dead = 1;
1351 xfrm_policy_destroy(xp);
1352 return NULL;
1353 }
1354
1355 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1356 struct nlattr **attrs)
1357 {
1358 struct net *net = sock_net(skb->sk);
1359 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1360 struct xfrm_policy *xp;
1361 struct km_event c;
1362 int err;
1363 int excl;
1364 uid_t loginuid = audit_get_loginuid(current);
1365 u32 sessionid = audit_get_sessionid(current);
1366 u32 sid;
1367
1368 err = verify_newpolicy_info(p);
1369 if (err)
1370 return err;
1371 err = verify_sec_ctx_len(attrs);
1372 if (err)
1373 return err;
1374
1375 xp = xfrm_policy_construct(net, p, attrs, &err);
1376 if (!xp)
1377 return err;
1378
1379 /* shouldn't excl be based on nlh flags??
1380 * Aha! this is anti-netlink really i.e more pfkey derived
1381 * in netlink excl is a flag and you wouldnt need
1382 * a type XFRM_MSG_UPDPOLICY - JHS */
1383 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1384 err = xfrm_policy_insert(p->dir, xp, excl);
1385 security_task_getsecid(current, &sid);
1386 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1387
1388 if (err) {
1389 security_xfrm_policy_free(xp->security);
1390 kfree(xp);
1391 return err;
1392 }
1393
1394 c.event = nlh->nlmsg_type;
1395 c.seq = nlh->nlmsg_seq;
1396 c.pid = nlh->nlmsg_pid;
1397 km_policy_notify(xp, p->dir, &c);
1398
1399 xfrm_pol_put(xp);
1400
1401 return 0;
1402 }
1403
1404 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1405 {
1406 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1407 int i;
1408
1409 if (xp->xfrm_nr == 0)
1410 return 0;
1411
1412 for (i = 0; i < xp->xfrm_nr; i++) {
1413 struct xfrm_user_tmpl *up = &vec[i];
1414 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1415
1416 memcpy(&up->id, &kp->id, sizeof(up->id));
1417 up->family = kp->encap_family;
1418 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1419 up->reqid = kp->reqid;
1420 up->mode = kp->mode;
1421 up->share = kp->share;
1422 up->optional = kp->optional;
1423 up->aalgos = kp->aalgos;
1424 up->ealgos = kp->ealgos;
1425 up->calgos = kp->calgos;
1426 }
1427
1428 return nla_put(skb, XFRMA_TMPL,
1429 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1430 }
1431
1432 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1433 {
1434 if (x->security) {
1435 return copy_sec_ctx(x->security, skb);
1436 }
1437 return 0;
1438 }
1439
1440 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1441 {
1442 if (xp->security) {
1443 return copy_sec_ctx(xp->security, skb);
1444 }
1445 return 0;
1446 }
1447 static inline size_t userpolicy_type_attrsize(void)
1448 {
1449 #ifdef CONFIG_XFRM_SUB_POLICY
1450 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1451 #else
1452 return 0;
1453 #endif
1454 }
1455
1456 #ifdef CONFIG_XFRM_SUB_POLICY
1457 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1458 {
1459 struct xfrm_userpolicy_type upt = {
1460 .type = type,
1461 };
1462
1463 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1464 }
1465
1466 #else
1467 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1468 {
1469 return 0;
1470 }
1471 #endif
1472
1473 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1474 {
1475 struct xfrm_dump_info *sp = ptr;
1476 struct xfrm_userpolicy_info *p;
1477 struct sk_buff *in_skb = sp->in_skb;
1478 struct sk_buff *skb = sp->out_skb;
1479 struct nlmsghdr *nlh;
1480
1481 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1482 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1483 if (nlh == NULL)
1484 return -EMSGSIZE;
1485
1486 p = nlmsg_data(nlh);
1487 copy_to_user_policy(xp, p, dir);
1488 if (copy_to_user_tmpl(xp, skb) < 0)
1489 goto nlmsg_failure;
1490 if (copy_to_user_sec_ctx(xp, skb))
1491 goto nlmsg_failure;
1492 if (copy_to_user_policy_type(xp->type, skb) < 0)
1493 goto nlmsg_failure;
1494 if (xfrm_mark_put(skb, &xp->mark))
1495 goto nla_put_failure;
1496
1497 nlmsg_end(skb, nlh);
1498 return 0;
1499
1500 nla_put_failure:
1501 nlmsg_failure:
1502 nlmsg_cancel(skb, nlh);
1503 return -EMSGSIZE;
1504 }
1505
1506 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1507 {
1508 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1509
1510 xfrm_policy_walk_done(walk);
1511 return 0;
1512 }
1513
1514 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1515 {
1516 struct net *net = sock_net(skb->sk);
1517 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1518 struct xfrm_dump_info info;
1519
1520 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1521 sizeof(cb->args) - sizeof(cb->args[0]));
1522
1523 info.in_skb = cb->skb;
1524 info.out_skb = skb;
1525 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1526 info.nlmsg_flags = NLM_F_MULTI;
1527
1528 if (!cb->args[0]) {
1529 cb->args[0] = 1;
1530 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1531 }
1532
1533 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1534
1535 return skb->len;
1536 }
1537
1538 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1539 struct xfrm_policy *xp,
1540 int dir, u32 seq)
1541 {
1542 struct xfrm_dump_info info;
1543 struct sk_buff *skb;
1544
1545 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1546 if (!skb)
1547 return ERR_PTR(-ENOMEM);
1548
1549 info.in_skb = in_skb;
1550 info.out_skb = skb;
1551 info.nlmsg_seq = seq;
1552 info.nlmsg_flags = 0;
1553
1554 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1555 kfree_skb(skb);
1556 return NULL;
1557 }
1558
1559 return skb;
1560 }
1561
1562 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1563 struct nlattr **attrs)
1564 {
1565 struct net *net = sock_net(skb->sk);
1566 struct xfrm_policy *xp;
1567 struct xfrm_userpolicy_id *p;
1568 u8 type = XFRM_POLICY_TYPE_MAIN;
1569 int err;
1570 struct km_event c;
1571 int delete;
1572 struct xfrm_mark m;
1573 u32 mark = xfrm_mark_get(attrs, &m);
1574
1575 p = nlmsg_data(nlh);
1576 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1577
1578 err = copy_from_user_policy_type(&type, attrs);
1579 if (err)
1580 return err;
1581
1582 err = verify_policy_dir(p->dir);
1583 if (err)
1584 return err;
1585
1586 if (p->index)
1587 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1588 else {
1589 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1590 struct xfrm_sec_ctx *ctx;
1591
1592 err = verify_sec_ctx_len(attrs);
1593 if (err)
1594 return err;
1595
1596 ctx = NULL;
1597 if (rt) {
1598 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1599
1600 err = security_xfrm_policy_alloc(&ctx, uctx);
1601 if (err)
1602 return err;
1603 }
1604 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1605 ctx, delete, &err);
1606 security_xfrm_policy_free(ctx);
1607 }
1608 if (xp == NULL)
1609 return -ENOENT;
1610
1611 if (!delete) {
1612 struct sk_buff *resp_skb;
1613
1614 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1615 if (IS_ERR(resp_skb)) {
1616 err = PTR_ERR(resp_skb);
1617 } else {
1618 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1619 NETLINK_CB(skb).pid);
1620 }
1621 } else {
1622 uid_t loginuid = audit_get_loginuid(current);
1623 u32 sessionid = audit_get_sessionid(current);
1624 u32 sid;
1625
1626 security_task_getsecid(current, &sid);
1627 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1628 sid);
1629
1630 if (err != 0)
1631 goto out;
1632
1633 c.data.byid = p->index;
1634 c.event = nlh->nlmsg_type;
1635 c.seq = nlh->nlmsg_seq;
1636 c.pid = nlh->nlmsg_pid;
1637 km_policy_notify(xp, p->dir, &c);
1638 }
1639
1640 out:
1641 xfrm_pol_put(xp);
1642 return err;
1643 }
1644
1645 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1646 struct nlattr **attrs)
1647 {
1648 struct net *net = sock_net(skb->sk);
1649 struct km_event c;
1650 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1651 struct xfrm_audit audit_info;
1652 int err;
1653
1654 audit_info.loginuid = audit_get_loginuid(current);
1655 audit_info.sessionid = audit_get_sessionid(current);
1656 security_task_getsecid(current, &audit_info.secid);
1657 err = xfrm_state_flush(net, p->proto, &audit_info);
1658 if (err) {
1659 if (err == -ESRCH) /* empty table */
1660 return 0;
1661 return err;
1662 }
1663 c.data.proto = p->proto;
1664 c.event = nlh->nlmsg_type;
1665 c.seq = nlh->nlmsg_seq;
1666 c.pid = nlh->nlmsg_pid;
1667 c.net = net;
1668 km_state_notify(NULL, &c);
1669
1670 return 0;
1671 }
1672
1673 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1674 {
1675 size_t replay_size = x->replay_esn ?
1676 xfrm_replay_state_esn_len(x->replay_esn) :
1677 sizeof(struct xfrm_replay_state);
1678
1679 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1680 + nla_total_size(replay_size)
1681 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1682 + nla_total_size(sizeof(struct xfrm_mark))
1683 + nla_total_size(4) /* XFRM_AE_RTHR */
1684 + nla_total_size(4); /* XFRM_AE_ETHR */
1685 }
1686
1687 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1688 {
1689 struct xfrm_aevent_id *id;
1690 struct nlmsghdr *nlh;
1691
1692 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1693 if (nlh == NULL)
1694 return -EMSGSIZE;
1695
1696 id = nlmsg_data(nlh);
1697 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1698 id->sa_id.spi = x->id.spi;
1699 id->sa_id.family = x->props.family;
1700 id->sa_id.proto = x->id.proto;
1701 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1702 id->reqid = x->props.reqid;
1703 id->flags = c->data.aevent;
1704
1705 if (x->replay_esn) {
1706 if (nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1707 xfrm_replay_state_esn_len(x->replay_esn),
1708 x->replay_esn))
1709 goto nla_put_failure;
1710 } else {
1711 if (nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1712 &x->replay))
1713 goto nla_put_failure;
1714 }
1715 if (nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft))
1716 goto nla_put_failure;
1717
1718 if ((id->flags & XFRM_AE_RTHR) &&
1719 nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff))
1720 goto nla_put_failure;
1721
1722 if ((id->flags & XFRM_AE_ETHR) &&
1723 nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1724 x->replay_maxage * 10 / HZ))
1725 goto nla_put_failure;
1726
1727 if (xfrm_mark_put(skb, &x->mark))
1728 goto nla_put_failure;
1729
1730 return nlmsg_end(skb, nlh);
1731
1732 nla_put_failure:
1733 nlmsg_cancel(skb, nlh);
1734 return -EMSGSIZE;
1735 }
1736
1737 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1738 struct nlattr **attrs)
1739 {
1740 struct net *net = sock_net(skb->sk);
1741 struct xfrm_state *x;
1742 struct sk_buff *r_skb;
1743 int err;
1744 struct km_event c;
1745 u32 mark;
1746 struct xfrm_mark m;
1747 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1748 struct xfrm_usersa_id *id = &p->sa_id;
1749
1750 mark = xfrm_mark_get(attrs, &m);
1751
1752 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1753 if (x == NULL)
1754 return -ESRCH;
1755
1756 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1757 if (r_skb == NULL) {
1758 xfrm_state_put(x);
1759 return -ENOMEM;
1760 }
1761
1762 /*
1763 * XXX: is this lock really needed - none of the other
1764 * gets lock (the concern is things getting updated
1765 * while we are still reading) - jhs
1766 */
1767 spin_lock_bh(&x->lock);
1768 c.data.aevent = p->flags;
1769 c.seq = nlh->nlmsg_seq;
1770 c.pid = nlh->nlmsg_pid;
1771
1772 if (build_aevent(r_skb, x, &c) < 0)
1773 BUG();
1774 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1775 spin_unlock_bh(&x->lock);
1776 xfrm_state_put(x);
1777 return err;
1778 }
1779
1780 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1781 struct nlattr **attrs)
1782 {
1783 struct net *net = sock_net(skb->sk);
1784 struct xfrm_state *x;
1785 struct km_event c;
1786 int err = - EINVAL;
1787 u32 mark = 0;
1788 struct xfrm_mark m;
1789 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1790 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1791 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1792 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1793
1794 if (!lt && !rp && !re)
1795 return err;
1796
1797 /* pedantic mode - thou shalt sayeth replaceth */
1798 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1799 return err;
1800
1801 mark = xfrm_mark_get(attrs, &m);
1802
1803 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1804 if (x == NULL)
1805 return -ESRCH;
1806
1807 if (x->km.state != XFRM_STATE_VALID)
1808 goto out;
1809
1810 err = xfrm_replay_verify_len(x->replay_esn, rp);
1811 if (err)
1812 goto out;
1813
1814 spin_lock_bh(&x->lock);
1815 xfrm_update_ae_params(x, attrs);
1816 spin_unlock_bh(&x->lock);
1817
1818 c.event = nlh->nlmsg_type;
1819 c.seq = nlh->nlmsg_seq;
1820 c.pid = nlh->nlmsg_pid;
1821 c.data.aevent = XFRM_AE_CU;
1822 km_state_notify(x, &c);
1823 err = 0;
1824 out:
1825 xfrm_state_put(x);
1826 return err;
1827 }
1828
1829 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 struct nlattr **attrs)
1831 {
1832 struct net *net = sock_net(skb->sk);
1833 struct km_event c;
1834 u8 type = XFRM_POLICY_TYPE_MAIN;
1835 int err;
1836 struct xfrm_audit audit_info;
1837
1838 err = copy_from_user_policy_type(&type, attrs);
1839 if (err)
1840 return err;
1841
1842 audit_info.loginuid = audit_get_loginuid(current);
1843 audit_info.sessionid = audit_get_sessionid(current);
1844 security_task_getsecid(current, &audit_info.secid);
1845 err = xfrm_policy_flush(net, type, &audit_info);
1846 if (err) {
1847 if (err == -ESRCH) /* empty table */
1848 return 0;
1849 return err;
1850 }
1851
1852 c.data.type = type;
1853 c.event = nlh->nlmsg_type;
1854 c.seq = nlh->nlmsg_seq;
1855 c.pid = nlh->nlmsg_pid;
1856 c.net = net;
1857 km_policy_notify(NULL, 0, &c);
1858 return 0;
1859 }
1860
1861 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1862 struct nlattr **attrs)
1863 {
1864 struct net *net = sock_net(skb->sk);
1865 struct xfrm_policy *xp;
1866 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1867 struct xfrm_userpolicy_info *p = &up->pol;
1868 u8 type = XFRM_POLICY_TYPE_MAIN;
1869 int err = -ENOENT;
1870 struct xfrm_mark m;
1871 u32 mark = xfrm_mark_get(attrs, &m);
1872
1873 err = copy_from_user_policy_type(&type, attrs);
1874 if (err)
1875 return err;
1876
1877 err = verify_policy_dir(p->dir);
1878 if (err)
1879 return err;
1880
1881 if (p->index)
1882 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1883 else {
1884 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1885 struct xfrm_sec_ctx *ctx;
1886
1887 err = verify_sec_ctx_len(attrs);
1888 if (err)
1889 return err;
1890
1891 ctx = NULL;
1892 if (rt) {
1893 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1894
1895 err = security_xfrm_policy_alloc(&ctx, uctx);
1896 if (err)
1897 return err;
1898 }
1899 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1900 &p->sel, ctx, 0, &err);
1901 security_xfrm_policy_free(ctx);
1902 }
1903 if (xp == NULL)
1904 return -ENOENT;
1905
1906 if (unlikely(xp->walk.dead))
1907 goto out;
1908
1909 err = 0;
1910 if (up->hard) {
1911 uid_t loginuid = audit_get_loginuid(current);
1912 u32 sessionid = audit_get_sessionid(current);
1913 u32 sid;
1914
1915 security_task_getsecid(current, &sid);
1916 xfrm_policy_delete(xp, p->dir);
1917 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1918
1919 } else {
1920 // reset the timers here?
1921 WARN(1, "Dont know what to do with soft policy expire\n");
1922 }
1923 km_policy_expired(xp, p->dir, up->hard, current->pid);
1924
1925 out:
1926 xfrm_pol_put(xp);
1927 return err;
1928 }
1929
1930 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1931 struct nlattr **attrs)
1932 {
1933 struct net *net = sock_net(skb->sk);
1934 struct xfrm_state *x;
1935 int err;
1936 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1937 struct xfrm_usersa_info *p = &ue->state;
1938 struct xfrm_mark m;
1939 u32 mark = xfrm_mark_get(attrs, &m);
1940
1941 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1942
1943 err = -ENOENT;
1944 if (x == NULL)
1945 return err;
1946
1947 spin_lock_bh(&x->lock);
1948 err = -EINVAL;
1949 if (x->km.state != XFRM_STATE_VALID)
1950 goto out;
1951 km_state_expired(x, ue->hard, current->pid);
1952
1953 if (ue->hard) {
1954 uid_t loginuid = audit_get_loginuid(current);
1955 u32 sessionid = audit_get_sessionid(current);
1956 u32 sid;
1957
1958 security_task_getsecid(current, &sid);
1959 __xfrm_state_delete(x);
1960 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1961 }
1962 err = 0;
1963 out:
1964 spin_unlock_bh(&x->lock);
1965 xfrm_state_put(x);
1966 return err;
1967 }
1968
1969 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1970 struct nlattr **attrs)
1971 {
1972 struct net *net = sock_net(skb->sk);
1973 struct xfrm_policy *xp;
1974 struct xfrm_user_tmpl *ut;
1975 int i;
1976 struct nlattr *rt = attrs[XFRMA_TMPL];
1977 struct xfrm_mark mark;
1978
1979 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1980 struct xfrm_state *x = xfrm_state_alloc(net);
1981 int err = -ENOMEM;
1982
1983 if (!x)
1984 goto nomem;
1985
1986 xfrm_mark_get(attrs, &mark);
1987
1988 err = verify_newpolicy_info(&ua->policy);
1989 if (err)
1990 goto bad_policy;
1991
1992 /* build an XP */
1993 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1994 if (!xp)
1995 goto free_state;
1996
1997 memcpy(&x->id, &ua->id, sizeof(ua->id));
1998 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1999 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2000 xp->mark.m = x->mark.m = mark.m;
2001 xp->mark.v = x->mark.v = mark.v;
2002 ut = nla_data(rt);
2003 /* extract the templates and for each call km_key */
2004 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2005 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2006 memcpy(&x->id, &t->id, sizeof(x->id));
2007 x->props.mode = t->mode;
2008 x->props.reqid = t->reqid;
2009 x->props.family = ut->family;
2010 t->aalgos = ua->aalgos;
2011 t->ealgos = ua->ealgos;
2012 t->calgos = ua->calgos;
2013 err = km_query(x, t, xp);
2014
2015 }
2016
2017 kfree(x);
2018 kfree(xp);
2019
2020 return 0;
2021
2022 bad_policy:
2023 WARN(1, "BAD policy passed\n");
2024 free_state:
2025 kfree(x);
2026 nomem:
2027 return err;
2028 }
2029
2030 #ifdef CONFIG_XFRM_MIGRATE
2031 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2032 struct xfrm_kmaddress *k,
2033 struct nlattr **attrs, int *num)
2034 {
2035 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2036 struct xfrm_user_migrate *um;
2037 int i, num_migrate;
2038
2039 if (k != NULL) {
2040 struct xfrm_user_kmaddress *uk;
2041
2042 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2043 memcpy(&k->local, &uk->local, sizeof(k->local));
2044 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2045 k->family = uk->family;
2046 k->reserved = uk->reserved;
2047 }
2048
2049 um = nla_data(rt);
2050 num_migrate = nla_len(rt) / sizeof(*um);
2051
2052 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2053 return -EINVAL;
2054
2055 for (i = 0; i < num_migrate; i++, um++, ma++) {
2056 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2057 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2058 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2059 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2060
2061 ma->proto = um->proto;
2062 ma->mode = um->mode;
2063 ma->reqid = um->reqid;
2064
2065 ma->old_family = um->old_family;
2066 ma->new_family = um->new_family;
2067 }
2068
2069 *num = i;
2070 return 0;
2071 }
2072
2073 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2074 struct nlattr **attrs)
2075 {
2076 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2077 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2078 struct xfrm_kmaddress km, *kmp;
2079 u8 type;
2080 int err;
2081 int n = 0;
2082
2083 if (attrs[XFRMA_MIGRATE] == NULL)
2084 return -EINVAL;
2085
2086 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2087
2088 err = copy_from_user_policy_type(&type, attrs);
2089 if (err)
2090 return err;
2091
2092 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2093 if (err)
2094 return err;
2095
2096 if (!n)
2097 return 0;
2098
2099 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2100
2101 return 0;
2102 }
2103 #else
2104 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2105 struct nlattr **attrs)
2106 {
2107 return -ENOPROTOOPT;
2108 }
2109 #endif
2110
2111 #ifdef CONFIG_XFRM_MIGRATE
2112 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2113 {
2114 struct xfrm_user_migrate um;
2115
2116 memset(&um, 0, sizeof(um));
2117 um.proto = m->proto;
2118 um.mode = m->mode;
2119 um.reqid = m->reqid;
2120 um.old_family = m->old_family;
2121 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2122 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2123 um.new_family = m->new_family;
2124 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2125 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2126
2127 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2128 }
2129
2130 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2131 {
2132 struct xfrm_user_kmaddress uk;
2133
2134 memset(&uk, 0, sizeof(uk));
2135 uk.family = k->family;
2136 uk.reserved = k->reserved;
2137 memcpy(&uk.local, &k->local, sizeof(uk.local));
2138 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2139
2140 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2141 }
2142
2143 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2144 {
2145 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2146 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2147 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2148 + userpolicy_type_attrsize();
2149 }
2150
2151 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2152 int num_migrate, const struct xfrm_kmaddress *k,
2153 const struct xfrm_selector *sel, u8 dir, u8 type)
2154 {
2155 const struct xfrm_migrate *mp;
2156 struct xfrm_userpolicy_id *pol_id;
2157 struct nlmsghdr *nlh;
2158 int i;
2159
2160 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2161 if (nlh == NULL)
2162 return -EMSGSIZE;
2163
2164 pol_id = nlmsg_data(nlh);
2165 /* copy data from selector, dir, and type to the pol_id */
2166 memset(pol_id, 0, sizeof(*pol_id));
2167 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2168 pol_id->dir = dir;
2169
2170 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2171 goto nlmsg_failure;
2172
2173 if (copy_to_user_policy_type(type, skb) < 0)
2174 goto nlmsg_failure;
2175
2176 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2177 if (copy_to_user_migrate(mp, skb) < 0)
2178 goto nlmsg_failure;
2179 }
2180
2181 return nlmsg_end(skb, nlh);
2182 nlmsg_failure:
2183 nlmsg_cancel(skb, nlh);
2184 return -EMSGSIZE;
2185 }
2186
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 struct net *net = &init_net;
2192 struct sk_buff *skb;
2193
2194 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2195 if (skb == NULL)
2196 return -ENOMEM;
2197
2198 /* build migrate */
2199 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2200 BUG();
2201
2202 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2203 }
2204 #else
2205 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2206 const struct xfrm_migrate *m, int num_migrate,
2207 const struct xfrm_kmaddress *k)
2208 {
2209 return -ENOPROTOOPT;
2210 }
2211 #endif
2212
2213 #define XMSGSIZE(type) sizeof(struct type)
2214
2215 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2216 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2217 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2218 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2219 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2220 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2221 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2222 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2223 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2224 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2225 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2226 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2227 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2228 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2229 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2230 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2231 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2232 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2233 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2234 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2235 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2236 };
2237
2238 #undef XMSGSIZE
2239
2240 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2241 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2242 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2243 [XFRMA_LASTUSED] = { .type = NLA_U64},
2244 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2245 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2246 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2247 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2248 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2249 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2250 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2251 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2252 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2253 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2254 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2255 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2256 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2257 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2258 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2259 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2260 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2261 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2262 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2263 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2264 };
2265
2266 static struct xfrm_link {
2267 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2268 int (*dump)(struct sk_buff *, struct netlink_callback *);
2269 int (*done)(struct netlink_callback *);
2270 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2271 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2272 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2273 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2274 .dump = xfrm_dump_sa,
2275 .done = xfrm_dump_sa_done },
2276 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2277 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2278 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2279 .dump = xfrm_dump_policy,
2280 .done = xfrm_dump_policy_done },
2281 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2282 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2283 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2284 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2285 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2286 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2287 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2288 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2289 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2290 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2291 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2292 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2293 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2294 };
2295
2296 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2297 {
2298 struct net *net = sock_net(skb->sk);
2299 struct nlattr *attrs[XFRMA_MAX+1];
2300 struct xfrm_link *link;
2301 int type, err;
2302
2303 type = nlh->nlmsg_type;
2304 if (type > XFRM_MSG_MAX)
2305 return -EINVAL;
2306
2307 type -= XFRM_MSG_BASE;
2308 link = &xfrm_dispatch[type];
2309
2310 /* All operations require privileges, even GET */
2311 if (!capable(CAP_NET_ADMIN))
2312 return -EPERM;
2313
2314 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2315 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2316 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2317 if (link->dump == NULL)
2318 return -EINVAL;
2319
2320 {
2321 struct netlink_dump_control c = {
2322 .dump = link->dump,
2323 .done = link->done,
2324 };
2325 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2326 }
2327 }
2328
2329 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2330 xfrma_policy);
2331 if (err < 0)
2332 return err;
2333
2334 if (link->doit == NULL)
2335 return -EINVAL;
2336
2337 return link->doit(skb, nlh, attrs);
2338 }
2339
2340 static void xfrm_netlink_rcv(struct sk_buff *skb)
2341 {
2342 mutex_lock(&xfrm_cfg_mutex);
2343 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2344 mutex_unlock(&xfrm_cfg_mutex);
2345 }
2346
2347 static inline size_t xfrm_expire_msgsize(void)
2348 {
2349 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2350 + nla_total_size(sizeof(struct xfrm_mark));
2351 }
2352
2353 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2354 {
2355 struct xfrm_user_expire *ue;
2356 struct nlmsghdr *nlh;
2357
2358 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2359 if (nlh == NULL)
2360 return -EMSGSIZE;
2361
2362 ue = nlmsg_data(nlh);
2363 copy_to_user_state(x, &ue->state);
2364 ue->hard = (c->data.hard != 0) ? 1 : 0;
2365
2366 if (xfrm_mark_put(skb, &x->mark))
2367 goto nla_put_failure;
2368
2369 return nlmsg_end(skb, nlh);
2370
2371 nla_put_failure:
2372 return -EMSGSIZE;
2373 }
2374
2375 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2376 {
2377 struct net *net = xs_net(x);
2378 struct sk_buff *skb;
2379
2380 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2381 if (skb == NULL)
2382 return -ENOMEM;
2383
2384 if (build_expire(skb, x, c) < 0) {
2385 kfree_skb(skb);
2386 return -EMSGSIZE;
2387 }
2388
2389 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2390 }
2391
2392 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2393 {
2394 struct net *net = xs_net(x);
2395 struct sk_buff *skb;
2396
2397 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2398 if (skb == NULL)
2399 return -ENOMEM;
2400
2401 if (build_aevent(skb, x, c) < 0)
2402 BUG();
2403
2404 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2405 }
2406
2407 static int xfrm_notify_sa_flush(const struct km_event *c)
2408 {
2409 struct net *net = c->net;
2410 struct xfrm_usersa_flush *p;
2411 struct nlmsghdr *nlh;
2412 struct sk_buff *skb;
2413 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2414
2415 skb = nlmsg_new(len, GFP_ATOMIC);
2416 if (skb == NULL)
2417 return -ENOMEM;
2418
2419 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2420 if (nlh == NULL) {
2421 kfree_skb(skb);
2422 return -EMSGSIZE;
2423 }
2424
2425 p = nlmsg_data(nlh);
2426 p->proto = c->data.proto;
2427
2428 nlmsg_end(skb, nlh);
2429
2430 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2431 }
2432
2433 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2434 {
2435 size_t l = 0;
2436 if (x->aead)
2437 l += nla_total_size(aead_len(x->aead));
2438 if (x->aalg) {
2439 l += nla_total_size(sizeof(struct xfrm_algo) +
2440 (x->aalg->alg_key_len + 7) / 8);
2441 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2442 }
2443 if (x->ealg)
2444 l += nla_total_size(xfrm_alg_len(x->ealg));
2445 if (x->calg)
2446 l += nla_total_size(sizeof(*x->calg));
2447 if (x->encap)
2448 l += nla_total_size(sizeof(*x->encap));
2449 if (x->tfcpad)
2450 l += nla_total_size(sizeof(x->tfcpad));
2451 if (x->replay_esn)
2452 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2453 if (x->security)
2454 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2455 x->security->ctx_len);
2456 if (x->coaddr)
2457 l += nla_total_size(sizeof(*x->coaddr));
2458
2459 /* Must count x->lastused as it may become non-zero behind our back. */
2460 l += nla_total_size(sizeof(u64));
2461
2462 return l;
2463 }
2464
2465 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2466 {
2467 struct net *net = xs_net(x);
2468 struct xfrm_usersa_info *p;
2469 struct xfrm_usersa_id *id;
2470 struct nlmsghdr *nlh;
2471 struct sk_buff *skb;
2472 int len = xfrm_sa_len(x);
2473 int headlen;
2474
2475 headlen = sizeof(*p);
2476 if (c->event == XFRM_MSG_DELSA) {
2477 len += nla_total_size(headlen);
2478 headlen = sizeof(*id);
2479 len += nla_total_size(sizeof(struct xfrm_mark));
2480 }
2481 len += NLMSG_ALIGN(headlen);
2482
2483 skb = nlmsg_new(len, GFP_ATOMIC);
2484 if (skb == NULL)
2485 return -ENOMEM;
2486
2487 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2488 if (nlh == NULL)
2489 goto nla_put_failure;
2490
2491 p = nlmsg_data(nlh);
2492 if (c->event == XFRM_MSG_DELSA) {
2493 struct nlattr *attr;
2494
2495 id = nlmsg_data(nlh);
2496 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2497 id->spi = x->id.spi;
2498 id->family = x->props.family;
2499 id->proto = x->id.proto;
2500
2501 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2502 if (attr == NULL)
2503 goto nla_put_failure;
2504
2505 p = nla_data(attr);
2506 }
2507
2508 if (copy_to_user_state_extra(x, p, skb))
2509 goto nla_put_failure;
2510
2511 nlmsg_end(skb, nlh);
2512
2513 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2514
2515 nla_put_failure:
2516 /* Somebody screwed up with xfrm_sa_len! */
2517 WARN_ON(1);
2518 kfree_skb(skb);
2519 return -1;
2520 }
2521
2522 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2523 {
2524
2525 switch (c->event) {
2526 case XFRM_MSG_EXPIRE:
2527 return xfrm_exp_state_notify(x, c);
2528 case XFRM_MSG_NEWAE:
2529 return xfrm_aevent_state_notify(x, c);
2530 case XFRM_MSG_DELSA:
2531 case XFRM_MSG_UPDSA:
2532 case XFRM_MSG_NEWSA:
2533 return xfrm_notify_sa(x, c);
2534 case XFRM_MSG_FLUSHSA:
2535 return xfrm_notify_sa_flush(c);
2536 default:
2537 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2538 c->event);
2539 break;
2540 }
2541
2542 return 0;
2543
2544 }
2545
2546 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2547 struct xfrm_policy *xp)
2548 {
2549 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2550 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2551 + nla_total_size(sizeof(struct xfrm_mark))
2552 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2553 + userpolicy_type_attrsize();
2554 }
2555
2556 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2557 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2558 int dir)
2559 {
2560 struct xfrm_user_acquire *ua;
2561 struct nlmsghdr *nlh;
2562 __u32 seq = xfrm_get_acqseq();
2563
2564 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2565 if (nlh == NULL)
2566 return -EMSGSIZE;
2567
2568 ua = nlmsg_data(nlh);
2569 memcpy(&ua->id, &x->id, sizeof(ua->id));
2570 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2571 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2572 copy_to_user_policy(xp, &ua->policy, dir);
2573 ua->aalgos = xt->aalgos;
2574 ua->ealgos = xt->ealgos;
2575 ua->calgos = xt->calgos;
2576 ua->seq = x->km.seq = seq;
2577
2578 if (copy_to_user_tmpl(xp, skb) < 0)
2579 goto nlmsg_failure;
2580 if (copy_to_user_state_sec_ctx(x, skb))
2581 goto nlmsg_failure;
2582 if (copy_to_user_policy_type(xp->type, skb) < 0)
2583 goto nlmsg_failure;
2584 if (xfrm_mark_put(skb, &xp->mark))
2585 goto nla_put_failure;
2586
2587 return nlmsg_end(skb, nlh);
2588
2589 nla_put_failure:
2590 nlmsg_failure:
2591 nlmsg_cancel(skb, nlh);
2592 return -EMSGSIZE;
2593 }
2594
2595 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2596 struct xfrm_policy *xp, int dir)
2597 {
2598 struct net *net = xs_net(x);
2599 struct sk_buff *skb;
2600
2601 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2602 if (skb == NULL)
2603 return -ENOMEM;
2604
2605 if (build_acquire(skb, x, xt, xp, dir) < 0)
2606 BUG();
2607
2608 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2609 }
2610
2611 /* User gives us xfrm_user_policy_info followed by an array of 0
2612 * or more templates.
2613 */
2614 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2615 u8 *data, int len, int *dir)
2616 {
2617 struct net *net = sock_net(sk);
2618 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2619 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2620 struct xfrm_policy *xp;
2621 int nr;
2622
2623 switch (sk->sk_family) {
2624 case AF_INET:
2625 if (opt != IP_XFRM_POLICY) {
2626 *dir = -EOPNOTSUPP;
2627 return NULL;
2628 }
2629 break;
2630 #if IS_ENABLED(CONFIG_IPV6)
2631 case AF_INET6:
2632 if (opt != IPV6_XFRM_POLICY) {
2633 *dir = -EOPNOTSUPP;
2634 return NULL;
2635 }
2636 break;
2637 #endif
2638 default:
2639 *dir = -EINVAL;
2640 return NULL;
2641 }
2642
2643 *dir = -EINVAL;
2644
2645 if (len < sizeof(*p) ||
2646 verify_newpolicy_info(p))
2647 return NULL;
2648
2649 nr = ((len - sizeof(*p)) / sizeof(*ut));
2650 if (validate_tmpl(nr, ut, p->sel.family))
2651 return NULL;
2652
2653 if (p->dir > XFRM_POLICY_OUT)
2654 return NULL;
2655
2656 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2657 if (xp == NULL) {
2658 *dir = -ENOBUFS;
2659 return NULL;
2660 }
2661
2662 copy_from_user_policy(xp, p);
2663 xp->type = XFRM_POLICY_TYPE_MAIN;
2664 copy_templates(xp, ut, nr);
2665
2666 *dir = p->dir;
2667
2668 return xp;
2669 }
2670
2671 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2672 {
2673 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2674 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2675 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2676 + nla_total_size(sizeof(struct xfrm_mark))
2677 + userpolicy_type_attrsize();
2678 }
2679
2680 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2681 int dir, const struct km_event *c)
2682 {
2683 struct xfrm_user_polexpire *upe;
2684 struct nlmsghdr *nlh;
2685 int hard = c->data.hard;
2686
2687 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2688 if (nlh == NULL)
2689 return -EMSGSIZE;
2690
2691 upe = nlmsg_data(nlh);
2692 copy_to_user_policy(xp, &upe->pol, dir);
2693 if (copy_to_user_tmpl(xp, skb) < 0)
2694 goto nlmsg_failure;
2695 if (copy_to_user_sec_ctx(xp, skb))
2696 goto nlmsg_failure;
2697 if (copy_to_user_policy_type(xp->type, skb) < 0)
2698 goto nlmsg_failure;
2699 if (xfrm_mark_put(skb, &xp->mark))
2700 goto nla_put_failure;
2701 upe->hard = !!hard;
2702
2703 return nlmsg_end(skb, nlh);
2704
2705 nla_put_failure:
2706 nlmsg_failure:
2707 nlmsg_cancel(skb, nlh);
2708 return -EMSGSIZE;
2709 }
2710
2711 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2712 {
2713 struct net *net = xp_net(xp);
2714 struct sk_buff *skb;
2715
2716 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2717 if (skb == NULL)
2718 return -ENOMEM;
2719
2720 if (build_polexpire(skb, xp, dir, c) < 0)
2721 BUG();
2722
2723 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2724 }
2725
2726 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2727 {
2728 struct net *net = xp_net(xp);
2729 struct xfrm_userpolicy_info *p;
2730 struct xfrm_userpolicy_id *id;
2731 struct nlmsghdr *nlh;
2732 struct sk_buff *skb;
2733 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2734 int headlen;
2735
2736 headlen = sizeof(*p);
2737 if (c->event == XFRM_MSG_DELPOLICY) {
2738 len += nla_total_size(headlen);
2739 headlen = sizeof(*id);
2740 }
2741 len += userpolicy_type_attrsize();
2742 len += nla_total_size(sizeof(struct xfrm_mark));
2743 len += NLMSG_ALIGN(headlen);
2744
2745 skb = nlmsg_new(len, GFP_ATOMIC);
2746 if (skb == NULL)
2747 return -ENOMEM;
2748
2749 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2750 if (nlh == NULL)
2751 goto nlmsg_failure;
2752
2753 p = nlmsg_data(nlh);
2754 if (c->event == XFRM_MSG_DELPOLICY) {
2755 struct nlattr *attr;
2756
2757 id = nlmsg_data(nlh);
2758 memset(id, 0, sizeof(*id));
2759 id->dir = dir;
2760 if (c->data.byid)
2761 id->index = xp->index;
2762 else
2763 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2764
2765 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2766 if (attr == NULL)
2767 goto nlmsg_failure;
2768
2769 p = nla_data(attr);
2770 }
2771
2772 copy_to_user_policy(xp, p, dir);
2773 if (copy_to_user_tmpl(xp, skb) < 0)
2774 goto nlmsg_failure;
2775 if (copy_to_user_policy_type(xp->type, skb) < 0)
2776 goto nlmsg_failure;
2777
2778 if (xfrm_mark_put(skb, &xp->mark))
2779 goto nla_put_failure;
2780
2781 nlmsg_end(skb, nlh);
2782
2783 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2784
2785 nla_put_failure:
2786 nlmsg_failure:
2787 kfree_skb(skb);
2788 return -1;
2789 }
2790
2791 static int xfrm_notify_policy_flush(const struct km_event *c)
2792 {
2793 struct net *net = c->net;
2794 struct nlmsghdr *nlh;
2795 struct sk_buff *skb;
2796
2797 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2798 if (skb == NULL)
2799 return -ENOMEM;
2800
2801 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2802 if (nlh == NULL)
2803 goto nlmsg_failure;
2804 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2805 goto nlmsg_failure;
2806
2807 nlmsg_end(skb, nlh);
2808
2809 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2810
2811 nlmsg_failure:
2812 kfree_skb(skb);
2813 return -1;
2814 }
2815
2816 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2817 {
2818
2819 switch (c->event) {
2820 case XFRM_MSG_NEWPOLICY:
2821 case XFRM_MSG_UPDPOLICY:
2822 case XFRM_MSG_DELPOLICY:
2823 return xfrm_notify_policy(xp, dir, c);
2824 case XFRM_MSG_FLUSHPOLICY:
2825 return xfrm_notify_policy_flush(c);
2826 case XFRM_MSG_POLEXPIRE:
2827 return xfrm_exp_policy_notify(xp, dir, c);
2828 default:
2829 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2830 c->event);
2831 }
2832
2833 return 0;
2834
2835 }
2836
2837 static inline size_t xfrm_report_msgsize(void)
2838 {
2839 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2840 }
2841
2842 static int build_report(struct sk_buff *skb, u8 proto,
2843 struct xfrm_selector *sel, xfrm_address_t *addr)
2844 {
2845 struct xfrm_user_report *ur;
2846 struct nlmsghdr *nlh;
2847
2848 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2849 if (nlh == NULL)
2850 return -EMSGSIZE;
2851
2852 ur = nlmsg_data(nlh);
2853 ur->proto = proto;
2854 memcpy(&ur->sel, sel, sizeof(ur->sel));
2855
2856 if (addr &&
2857 nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr))
2858 goto nla_put_failure;
2859
2860 return nlmsg_end(skb, nlh);
2861
2862 nla_put_failure:
2863 nlmsg_cancel(skb, nlh);
2864 return -EMSGSIZE;
2865 }
2866
2867 static int xfrm_send_report(struct net *net, u8 proto,
2868 struct xfrm_selector *sel, xfrm_address_t *addr)
2869 {
2870 struct sk_buff *skb;
2871
2872 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2873 if (skb == NULL)
2874 return -ENOMEM;
2875
2876 if (build_report(skb, proto, sel, addr) < 0)
2877 BUG();
2878
2879 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2880 }
2881
2882 static inline size_t xfrm_mapping_msgsize(void)
2883 {
2884 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2885 }
2886
2887 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2888 xfrm_address_t *new_saddr, __be16 new_sport)
2889 {
2890 struct xfrm_user_mapping *um;
2891 struct nlmsghdr *nlh;
2892
2893 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2894 if (nlh == NULL)
2895 return -EMSGSIZE;
2896
2897 um = nlmsg_data(nlh);
2898
2899 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2900 um->id.spi = x->id.spi;
2901 um->id.family = x->props.family;
2902 um->id.proto = x->id.proto;
2903 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2904 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2905 um->new_sport = new_sport;
2906 um->old_sport = x->encap->encap_sport;
2907 um->reqid = x->props.reqid;
2908
2909 return nlmsg_end(skb, nlh);
2910 }
2911
2912 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2913 __be16 sport)
2914 {
2915 struct net *net = xs_net(x);
2916 struct sk_buff *skb;
2917
2918 if (x->id.proto != IPPROTO_ESP)
2919 return -EINVAL;
2920
2921 if (!x->encap)
2922 return -EINVAL;
2923
2924 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2925 if (skb == NULL)
2926 return -ENOMEM;
2927
2928 if (build_mapping(skb, x, ipaddr, sport) < 0)
2929 BUG();
2930
2931 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2932 }
2933
2934 static struct xfrm_mgr netlink_mgr = {
2935 .id = "netlink",
2936 .notify = xfrm_send_state_notify,
2937 .acquire = xfrm_send_acquire,
2938 .compile_policy = xfrm_compile_policy,
2939 .notify_policy = xfrm_send_policy_notify,
2940 .report = xfrm_send_report,
2941 .migrate = xfrm_send_migrate,
2942 .new_mapping = xfrm_send_mapping,
2943 };
2944
2945 static int __net_init xfrm_user_net_init(struct net *net)
2946 {
2947 struct sock *nlsk;
2948
2949 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2950 xfrm_netlink_rcv, NULL, THIS_MODULE);
2951 if (nlsk == NULL)
2952 return -ENOMEM;
2953 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2954 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2955 return 0;
2956 }
2957
2958 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2959 {
2960 struct net *net;
2961 list_for_each_entry(net, net_exit_list, exit_list)
2962 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2963 synchronize_net();
2964 list_for_each_entry(net, net_exit_list, exit_list)
2965 netlink_kernel_release(net->xfrm.nlsk_stash);
2966 }
2967
2968 static struct pernet_operations xfrm_user_net_ops = {
2969 .init = xfrm_user_net_init,
2970 .exit_batch = xfrm_user_net_exit,
2971 };
2972
2973 static int __init xfrm_user_init(void)
2974 {
2975 int rv;
2976
2977 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2978
2979 rv = register_pernet_subsys(&xfrm_user_net_ops);
2980 if (rv < 0)
2981 return rv;
2982 rv = xfrm_register_km(&netlink_mgr);
2983 if (rv < 0)
2984 unregister_pernet_subsys(&xfrm_user_net_ops);
2985 return rv;
2986 }
2987
2988 static void __exit xfrm_user_exit(void)
2989 {
2990 xfrm_unregister_km(&netlink_mgr);
2991 unregister_pernet_subsys(&xfrm_user_net_ops);
2992 }
2993
2994 module_init(xfrm_user_init);
2995 module_exit(xfrm_user_exit);
2996 MODULE_LICENSE("GPL");
2997 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2998
Linux kernel - Deliverables
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