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Linux 3.12.28
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blob32a2dd39b78592d4d1ba124b3d2d9ad45a6a4d94
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 struct xfrm_replay_state_esn *rs;
127
128 if (p->flags & XFRM_STATE_ESN) {
129 if (!rt)
130 return -EINVAL;
131
132 rs = nla_data(rt);
133
134 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135 return -EINVAL;
136
137 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138 nla_len(rt) != sizeof(*rs))
139 return -EINVAL;
140 }
141
142 if (!rt)
143 return 0;
144
145 if (p->id.proto != IPPROTO_ESP)
146 return -EINVAL;
147
148 if (p->replay_window != 0)
149 return -EINVAL;
150
151 return 0;
152 }
153
154 static int verify_newsa_info(struct xfrm_usersa_info *p,
155 struct nlattr **attrs)
156 {
157 int err;
158
159 err = -EINVAL;
160 switch (p->family) {
161 case AF_INET:
162 break;
163
164 case AF_INET6:
165 #if IS_ENABLED(CONFIG_IPV6)
166 break;
167 #else
168 err = -EAFNOSUPPORT;
169 goto out;
170 #endif
171
172 default:
173 goto out;
174 }
175
176 err = -EINVAL;
177 switch (p->id.proto) {
178 case IPPROTO_AH:
179 if ((!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
181 attrs[XFRMA_ALG_AEAD] ||
182 attrs[XFRMA_ALG_CRYPT] ||
183 attrs[XFRMA_ALG_COMP] ||
184 attrs[XFRMA_TFCPAD])
185 goto out;
186 break;
187
188 case IPPROTO_ESP:
189 if (attrs[XFRMA_ALG_COMP])
190 goto out;
191 if (!attrs[XFRMA_ALG_AUTH] &&
192 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
193 !attrs[XFRMA_ALG_CRYPT] &&
194 !attrs[XFRMA_ALG_AEAD])
195 goto out;
196 if ((attrs[XFRMA_ALG_AUTH] ||
197 attrs[XFRMA_ALG_AUTH_TRUNC] ||
198 attrs[XFRMA_ALG_CRYPT]) &&
199 attrs[XFRMA_ALG_AEAD])
200 goto out;
201 if (attrs[XFRMA_TFCPAD] &&
202 p->mode != XFRM_MODE_TUNNEL)
203 goto out;
204 break;
205
206 case IPPROTO_COMP:
207 if (!attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AEAD] ||
209 attrs[XFRMA_ALG_AUTH] ||
210 attrs[XFRMA_ALG_AUTH_TRUNC] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_TFCPAD])
213 goto out;
214 break;
215
216 #if IS_ENABLED(CONFIG_IPV6)
217 case IPPROTO_DSTOPTS:
218 case IPPROTO_ROUTING:
219 if (attrs[XFRMA_ALG_COMP] ||
220 attrs[XFRMA_ALG_AUTH] ||
221 attrs[XFRMA_ALG_AUTH_TRUNC] ||
222 attrs[XFRMA_ALG_AEAD] ||
223 attrs[XFRMA_ALG_CRYPT] ||
224 attrs[XFRMA_ENCAP] ||
225 attrs[XFRMA_SEC_CTX] ||
226 attrs[XFRMA_TFCPAD] ||
227 !attrs[XFRMA_COADDR])
228 goto out;
229 break;
230 #endif
231
232 default:
233 goto out;
234 }
235
236 if ((err = verify_aead(attrs)))
237 goto out;
238 if ((err = verify_auth_trunc(attrs)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
243 goto out;
244 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
245 goto out;
246 if ((err = verify_sec_ctx_len(attrs)))
247 goto out;
248 if ((err = verify_replay(p, attrs)))
249 goto out;
250
251 err = -EINVAL;
252 switch (p->mode) {
253 case XFRM_MODE_TRANSPORT:
254 case XFRM_MODE_TUNNEL:
255 case XFRM_MODE_ROUTEOPTIMIZATION:
256 case XFRM_MODE_BEET:
257 break;
258
259 default:
260 goto out;
261 }
262
263 err = 0;
264
265 out:
266 return err;
267 }
268
269 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
270 struct xfrm_algo_desc *(*get_byname)(const char *, int),
271 struct nlattr *rta)
272 {
273 struct xfrm_algo *p, *ualg;
274 struct xfrm_algo_desc *algo;
275
276 if (!rta)
277 return 0;
278
279 ualg = nla_data(rta);
280
281 algo = get_byname(ualg->alg_name, 1);
282 if (!algo)
283 return -ENOSYS;
284 *props = algo->desc.sadb_alg_id;
285
286 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
287 if (!p)
288 return -ENOMEM;
289
290 strcpy(p->alg_name, algo->name);
291 *algpp = p;
292 return 0;
293 }
294
295 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296 struct nlattr *rta)
297 {
298 struct xfrm_algo *ualg;
299 struct xfrm_algo_auth *p;
300 struct xfrm_algo_desc *algo;
301
302 if (!rta)
303 return 0;
304
305 ualg = nla_data(rta);
306
307 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308 if (!algo)
309 return -ENOSYS;
310 *props = algo->desc.sadb_alg_id;
311
312 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313 if (!p)
314 return -ENOMEM;
315
316 strcpy(p->alg_name, algo->name);
317 p->alg_key_len = ualg->alg_key_len;
318 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320
321 *algpp = p;
322 return 0;
323 }
324
325 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326 struct nlattr *rta)
327 {
328 struct xfrm_algo_auth *p, *ualg;
329 struct xfrm_algo_desc *algo;
330
331 if (!rta)
332 return 0;
333
334 ualg = nla_data(rta);
335
336 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337 if (!algo)
338 return -ENOSYS;
339 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
341 return -EINVAL;
342 *props = algo->desc.sadb_alg_id;
343
344 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345 if (!p)
346 return -ENOMEM;
347
348 strcpy(p->alg_name, algo->name);
349 if (!p->alg_trunc_len)
350 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351
352 *algpp = p;
353 return 0;
354 }
355
356 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357 struct nlattr *rta)
358 {
359 struct xfrm_algo_aead *p, *ualg;
360 struct xfrm_algo_desc *algo;
361
362 if (!rta)
363 return 0;
364
365 ualg = nla_data(rta);
366
367 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368 if (!algo)
369 return -ENOSYS;
370 *props = algo->desc.sadb_alg_id;
371
372 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373 if (!p)
374 return -ENOMEM;
375
376 strcpy(p->alg_name, algo->name);
377 *algpp = p;
378 return 0;
379 }
380
381 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382 struct nlattr *rp)
383 {
384 struct xfrm_replay_state_esn *up;
385 int ulen;
386
387 if (!replay_esn || !rp)
388 return 0;
389
390 up = nla_data(rp);
391 ulen = xfrm_replay_state_esn_len(up);
392
393 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
394 return -EINVAL;
395
396 return 0;
397 }
398
399 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400 struct xfrm_replay_state_esn **preplay_esn,
401 struct nlattr *rta)
402 {
403 struct xfrm_replay_state_esn *p, *pp, *up;
404 int klen, ulen;
405
406 if (!rta)
407 return 0;
408
409 up = nla_data(rta);
410 klen = xfrm_replay_state_esn_len(up);
411 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
412
413 p = kzalloc(klen, GFP_KERNEL);
414 if (!p)
415 return -ENOMEM;
416
417 pp = kzalloc(klen, GFP_KERNEL);
418 if (!pp) {
419 kfree(p);
420 return -ENOMEM;
421 }
422
423 memcpy(p, up, ulen);
424 memcpy(pp, up, ulen);
425
426 *replay_esn = p;
427 *preplay_esn = pp;
428
429 return 0;
430 }
431
432 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
433 {
434 int len = 0;
435
436 if (xfrm_ctx) {
437 len += sizeof(struct xfrm_user_sec_ctx);
438 len += xfrm_ctx->ctx_len;
439 }
440 return len;
441 }
442
443 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444 {
445 memcpy(&x->id, &p->id, sizeof(x->id));
446 memcpy(&x->sel, &p->sel, sizeof(x->sel));
447 memcpy(&x->lft, &p->lft, sizeof(x->lft));
448 x->props.mode = p->mode;
449 x->props.replay_window = min_t(unsigned int, p->replay_window,
450 sizeof(x->replay.bitmap) * 8);
451 x->props.reqid = p->reqid;
452 x->props.family = p->family;
453 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
454 x->props.flags = p->flags;
455
456 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
457 x->sel.family = p->family;
458 }
459
460 /*
461 * someday when pfkey also has support, we could have the code
462 * somehow made shareable and move it to xfrm_state.c - JHS
463 *
464 */
465 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
466 int update_esn)
467 {
468 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
469 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
470 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
471 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
472 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
473
474 if (re) {
475 struct xfrm_replay_state_esn *replay_esn;
476 replay_esn = nla_data(re);
477 memcpy(x->replay_esn, replay_esn,
478 xfrm_replay_state_esn_len(replay_esn));
479 memcpy(x->preplay_esn, replay_esn,
480 xfrm_replay_state_esn_len(replay_esn));
481 }
482
483 if (rp) {
484 struct xfrm_replay_state *replay;
485 replay = nla_data(rp);
486 memcpy(&x->replay, replay, sizeof(*replay));
487 memcpy(&x->preplay, replay, sizeof(*replay));
488 }
489
490 if (lt) {
491 struct xfrm_lifetime_cur *ltime;
492 ltime = nla_data(lt);
493 x->curlft.bytes = ltime->bytes;
494 x->curlft.packets = ltime->packets;
495 x->curlft.add_time = ltime->add_time;
496 x->curlft.use_time = ltime->use_time;
497 }
498
499 if (et)
500 x->replay_maxage = nla_get_u32(et);
501
502 if (rt)
503 x->replay_maxdiff = nla_get_u32(rt);
504 }
505
506 static struct xfrm_state *xfrm_state_construct(struct net *net,
507 struct xfrm_usersa_info *p,
508 struct nlattr **attrs,
509 int *errp)
510 {
511 struct xfrm_state *x = xfrm_state_alloc(net);
512 int err = -ENOMEM;
513
514 if (!x)
515 goto error_no_put;
516
517 copy_from_user_state(x, p);
518
519 if (attrs[XFRMA_SA_EXTRA_FLAGS])
520 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
521
522 if ((err = attach_aead(&x->aead, &x->props.ealgo,
523 attrs[XFRMA_ALG_AEAD])))
524 goto error;
525 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
526 attrs[XFRMA_ALG_AUTH_TRUNC])))
527 goto error;
528 if (!x->props.aalgo) {
529 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
530 attrs[XFRMA_ALG_AUTH])))
531 goto error;
532 }
533 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
534 xfrm_ealg_get_byname,
535 attrs[XFRMA_ALG_CRYPT])))
536 goto error;
537 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
538 xfrm_calg_get_byname,
539 attrs[XFRMA_ALG_COMP])))
540 goto error;
541
542 if (attrs[XFRMA_ENCAP]) {
543 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
544 sizeof(*x->encap), GFP_KERNEL);
545 if (x->encap == NULL)
546 goto error;
547 }
548
549 if (attrs[XFRMA_TFCPAD])
550 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
551
552 if (attrs[XFRMA_COADDR]) {
553 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
554 sizeof(*x->coaddr), GFP_KERNEL);
555 if (x->coaddr == NULL)
556 goto error;
557 }
558
559 xfrm_mark_get(attrs, &x->mark);
560
561 err = __xfrm_init_state(x, false);
562 if (err)
563 goto error;
564
565 if (attrs[XFRMA_SEC_CTX] &&
566 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
567 goto error;
568
569 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
570 attrs[XFRMA_REPLAY_ESN_VAL])))
571 goto error;
572
573 x->km.seq = p->seq;
574 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
575 /* sysctl_xfrm_aevent_etime is in 100ms units */
576 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
577
578 if ((err = xfrm_init_replay(x)))
579 goto error;
580
581 /* override default values from above */
582 xfrm_update_ae_params(x, attrs, 0);
583
584 return x;
585
586 error:
587 x->km.state = XFRM_STATE_DEAD;
588 xfrm_state_put(x);
589 error_no_put:
590 *errp = err;
591 return NULL;
592 }
593
594 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
595 struct nlattr **attrs)
596 {
597 struct net *net = sock_net(skb->sk);
598 struct xfrm_usersa_info *p = nlmsg_data(nlh);
599 struct xfrm_state *x;
600 int err;
601 struct km_event c;
602 kuid_t loginuid = audit_get_loginuid(current);
603 u32 sessionid = audit_get_sessionid(current);
604 u32 sid;
605
606 err = verify_newsa_info(p, attrs);
607 if (err)
608 return err;
609
610 x = xfrm_state_construct(net, p, attrs, &err);
611 if (!x)
612 return err;
613
614 xfrm_state_hold(x);
615 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
616 err = xfrm_state_add(x);
617 else
618 err = xfrm_state_update(x);
619
620 security_task_getsecid(current, &sid);
621 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
622
623 if (err < 0) {
624 x->km.state = XFRM_STATE_DEAD;
625 __xfrm_state_put(x);
626 goto out;
627 }
628
629 c.seq = nlh->nlmsg_seq;
630 c.portid = nlh->nlmsg_pid;
631 c.event = nlh->nlmsg_type;
632
633 km_state_notify(x, &c);
634 out:
635 xfrm_state_put(x);
636 return err;
637 }
638
639 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
640 struct xfrm_usersa_id *p,
641 struct nlattr **attrs,
642 int *errp)
643 {
644 struct xfrm_state *x = NULL;
645 struct xfrm_mark m;
646 int err;
647 u32 mark = xfrm_mark_get(attrs, &m);
648
649 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
650 err = -ESRCH;
651 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
652 } else {
653 xfrm_address_t *saddr = NULL;
654
655 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
656 if (!saddr) {
657 err = -EINVAL;
658 goto out;
659 }
660
661 err = -ESRCH;
662 x = xfrm_state_lookup_byaddr(net, mark,
663 &p->daddr, saddr,
664 p->proto, p->family);
665 }
666
667 out:
668 if (!x && errp)
669 *errp = err;
670 return x;
671 }
672
673 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
674 struct nlattr **attrs)
675 {
676 struct net *net = sock_net(skb->sk);
677 struct xfrm_state *x;
678 int err = -ESRCH;
679 struct km_event c;
680 struct xfrm_usersa_id *p = nlmsg_data(nlh);
681 kuid_t loginuid = audit_get_loginuid(current);
682 u32 sessionid = audit_get_sessionid(current);
683 u32 sid;
684
685 x = xfrm_user_state_lookup(net, p, attrs, &err);
686 if (x == NULL)
687 return err;
688
689 if ((err = security_xfrm_state_delete(x)) != 0)
690 goto out;
691
692 if (xfrm_state_kern(x)) {
693 err = -EPERM;
694 goto out;
695 }
696
697 err = xfrm_state_delete(x);
698
699 if (err < 0)
700 goto out;
701
702 c.seq = nlh->nlmsg_seq;
703 c.portid = nlh->nlmsg_pid;
704 c.event = nlh->nlmsg_type;
705 km_state_notify(x, &c);
706
707 out:
708 security_task_getsecid(current, &sid);
709 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
710 xfrm_state_put(x);
711 return err;
712 }
713
714 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
715 {
716 memset(p, 0, sizeof(*p));
717 memcpy(&p->id, &x->id, sizeof(p->id));
718 memcpy(&p->sel, &x->sel, sizeof(p->sel));
719 memcpy(&p->lft, &x->lft, sizeof(p->lft));
720 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
721 memcpy(&p->stats, &x->stats, sizeof(p->stats));
722 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
723 p->mode = x->props.mode;
724 p->replay_window = x->props.replay_window;
725 p->reqid = x->props.reqid;
726 p->family = x->props.family;
727 p->flags = x->props.flags;
728 p->seq = x->km.seq;
729 }
730
731 struct xfrm_dump_info {
732 struct sk_buff *in_skb;
733 struct sk_buff *out_skb;
734 u32 nlmsg_seq;
735 u16 nlmsg_flags;
736 };
737
738 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
739 {
740 struct xfrm_user_sec_ctx *uctx;
741 struct nlattr *attr;
742 int ctx_size = sizeof(*uctx) + s->ctx_len;
743
744 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
745 if (attr == NULL)
746 return -EMSGSIZE;
747
748 uctx = nla_data(attr);
749 uctx->exttype = XFRMA_SEC_CTX;
750 uctx->len = ctx_size;
751 uctx->ctx_doi = s->ctx_doi;
752 uctx->ctx_alg = s->ctx_alg;
753 uctx->ctx_len = s->ctx_len;
754 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
755
756 return 0;
757 }
758
759 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
760 {
761 struct xfrm_algo *algo;
762 struct nlattr *nla;
763
764 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
765 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
766 if (!nla)
767 return -EMSGSIZE;
768
769 algo = nla_data(nla);
770 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
771 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
772 algo->alg_key_len = auth->alg_key_len;
773
774 return 0;
775 }
776
777 /* Don't change this without updating xfrm_sa_len! */
778 static int copy_to_user_state_extra(struct xfrm_state *x,
779 struct xfrm_usersa_info *p,
780 struct sk_buff *skb)
781 {
782 int ret = 0;
783
784 copy_to_user_state(x, p);
785
786 if (x->props.extra_flags) {
787 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
788 x->props.extra_flags);
789 if (ret)
790 goto out;
791 }
792
793 if (x->coaddr) {
794 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
795 if (ret)
796 goto out;
797 }
798 if (x->lastused) {
799 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
800 if (ret)
801 goto out;
802 }
803 if (x->aead) {
804 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
805 if (ret)
806 goto out;
807 }
808 if (x->aalg) {
809 ret = copy_to_user_auth(x->aalg, skb);
810 if (!ret)
811 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
812 xfrm_alg_auth_len(x->aalg), x->aalg);
813 if (ret)
814 goto out;
815 }
816 if (x->ealg) {
817 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
818 if (ret)
819 goto out;
820 }
821 if (x->calg) {
822 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
823 if (ret)
824 goto out;
825 }
826 if (x->encap) {
827 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
828 if (ret)
829 goto out;
830 }
831 if (x->tfcpad) {
832 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
833 if (ret)
834 goto out;
835 }
836 ret = xfrm_mark_put(skb, &x->mark);
837 if (ret)
838 goto out;
839 if (x->replay_esn) {
840 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
841 xfrm_replay_state_esn_len(x->replay_esn),
842 x->replay_esn);
843 if (ret)
844 goto out;
845 }
846 if (x->security)
847 ret = copy_sec_ctx(x->security, skb);
848 out:
849 return ret;
850 }
851
852 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
853 {
854 struct xfrm_dump_info *sp = ptr;
855 struct sk_buff *in_skb = sp->in_skb;
856 struct sk_buff *skb = sp->out_skb;
857 struct xfrm_usersa_info *p;
858 struct nlmsghdr *nlh;
859 int err;
860
861 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
862 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
863 if (nlh == NULL)
864 return -EMSGSIZE;
865
866 p = nlmsg_data(nlh);
867
868 err = copy_to_user_state_extra(x, p, skb);
869 if (err) {
870 nlmsg_cancel(skb, nlh);
871 return err;
872 }
873 nlmsg_end(skb, nlh);
874 return 0;
875 }
876
877 static int xfrm_dump_sa_done(struct netlink_callback *cb)
878 {
879 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
880 xfrm_state_walk_done(walk);
881 return 0;
882 }
883
884 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
885 {
886 struct net *net = sock_net(skb->sk);
887 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
888 struct xfrm_dump_info info;
889
890 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
891 sizeof(cb->args) - sizeof(cb->args[0]));
892
893 info.in_skb = cb->skb;
894 info.out_skb = skb;
895 info.nlmsg_seq = cb->nlh->nlmsg_seq;
896 info.nlmsg_flags = NLM_F_MULTI;
897
898 if (!cb->args[0]) {
899 cb->args[0] = 1;
900 xfrm_state_walk_init(walk, 0);
901 }
902
903 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
904
905 return skb->len;
906 }
907
908 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
909 struct xfrm_state *x, u32 seq)
910 {
911 struct xfrm_dump_info info;
912 struct sk_buff *skb;
913 int err;
914
915 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
916 if (!skb)
917 return ERR_PTR(-ENOMEM);
918
919 info.in_skb = in_skb;
920 info.out_skb = skb;
921 info.nlmsg_seq = seq;
922 info.nlmsg_flags = 0;
923
924 err = dump_one_state(x, 0, &info);
925 if (err) {
926 kfree_skb(skb);
927 return ERR_PTR(err);
928 }
929
930 return skb;
931 }
932
933 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
934 * Must be called with RCU read lock.
935 */
936 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
937 u32 pid, unsigned int group)
938 {
939 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
940
941 if (nlsk)
942 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
943 else
944 return -1;
945 }
946
947 static inline size_t xfrm_spdinfo_msgsize(void)
948 {
949 return NLMSG_ALIGN(4)
950 + nla_total_size(sizeof(struct xfrmu_spdinfo))
951 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
952 }
953
954 static int build_spdinfo(struct sk_buff *skb, struct net *net,
955 u32 portid, u32 seq, u32 flags)
956 {
957 struct xfrmk_spdinfo si;
958 struct xfrmu_spdinfo spc;
959 struct xfrmu_spdhinfo sph;
960 struct nlmsghdr *nlh;
961 int err;
962 u32 *f;
963
964 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
965 if (nlh == NULL) /* shouldn't really happen ... */
966 return -EMSGSIZE;
967
968 f = nlmsg_data(nlh);
969 *f = flags;
970 xfrm_spd_getinfo(net, &si);
971 spc.incnt = si.incnt;
972 spc.outcnt = si.outcnt;
973 spc.fwdcnt = si.fwdcnt;
974 spc.inscnt = si.inscnt;
975 spc.outscnt = si.outscnt;
976 spc.fwdscnt = si.fwdscnt;
977 sph.spdhcnt = si.spdhcnt;
978 sph.spdhmcnt = si.spdhmcnt;
979
980 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
981 if (!err)
982 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
983 if (err) {
984 nlmsg_cancel(skb, nlh);
985 return err;
986 }
987
988 return nlmsg_end(skb, nlh);
989 }
990
991 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
992 struct nlattr **attrs)
993 {
994 struct net *net = sock_net(skb->sk);
995 struct sk_buff *r_skb;
996 u32 *flags = nlmsg_data(nlh);
997 u32 sportid = NETLINK_CB(skb).portid;
998 u32 seq = nlh->nlmsg_seq;
999
1000 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1001 if (r_skb == NULL)
1002 return -ENOMEM;
1003
1004 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1005 BUG();
1006
1007 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1008 }
1009
1010 static inline size_t xfrm_sadinfo_msgsize(void)
1011 {
1012 return NLMSG_ALIGN(4)
1013 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1014 + nla_total_size(4); /* XFRMA_SAD_CNT */
1015 }
1016
1017 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1018 u32 portid, u32 seq, u32 flags)
1019 {
1020 struct xfrmk_sadinfo si;
1021 struct xfrmu_sadhinfo sh;
1022 struct nlmsghdr *nlh;
1023 int err;
1024 u32 *f;
1025
1026 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1027 if (nlh == NULL) /* shouldn't really happen ... */
1028 return -EMSGSIZE;
1029
1030 f = nlmsg_data(nlh);
1031 *f = flags;
1032 xfrm_sad_getinfo(net, &si);
1033
1034 sh.sadhmcnt = si.sadhmcnt;
1035 sh.sadhcnt = si.sadhcnt;
1036
1037 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1038 if (!err)
1039 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1040 if (err) {
1041 nlmsg_cancel(skb, nlh);
1042 return err;
1043 }
1044
1045 return nlmsg_end(skb, nlh);
1046 }
1047
1048 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1049 struct nlattr **attrs)
1050 {
1051 struct net *net = sock_net(skb->sk);
1052 struct sk_buff *r_skb;
1053 u32 *flags = nlmsg_data(nlh);
1054 u32 sportid = NETLINK_CB(skb).portid;
1055 u32 seq = nlh->nlmsg_seq;
1056
1057 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1058 if (r_skb == NULL)
1059 return -ENOMEM;
1060
1061 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1062 BUG();
1063
1064 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1065 }
1066
1067 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1068 struct nlattr **attrs)
1069 {
1070 struct net *net = sock_net(skb->sk);
1071 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1072 struct xfrm_state *x;
1073 struct sk_buff *resp_skb;
1074 int err = -ESRCH;
1075
1076 x = xfrm_user_state_lookup(net, p, attrs, &err);
1077 if (x == NULL)
1078 goto out_noput;
1079
1080 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1081 if (IS_ERR(resp_skb)) {
1082 err = PTR_ERR(resp_skb);
1083 } else {
1084 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1085 }
1086 xfrm_state_put(x);
1087 out_noput:
1088 return err;
1089 }
1090
1091 static int verify_userspi_info(struct xfrm_userspi_info *p)
1092 {
1093 switch (p->info.id.proto) {
1094 case IPPROTO_AH:
1095 case IPPROTO_ESP:
1096 break;
1097
1098 case IPPROTO_COMP:
1099 /* IPCOMP spi is 16-bits. */
1100 if (p->max >= 0x10000)
1101 return -EINVAL;
1102 break;
1103
1104 default:
1105 return -EINVAL;
1106 }
1107
1108 if (p->min > p->max)
1109 return -EINVAL;
1110
1111 return 0;
1112 }
1113
1114 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1115 struct nlattr **attrs)
1116 {
1117 struct net *net = sock_net(skb->sk);
1118 struct xfrm_state *x;
1119 struct xfrm_userspi_info *p;
1120 struct sk_buff *resp_skb;
1121 xfrm_address_t *daddr;
1122 int family;
1123 int err;
1124 u32 mark;
1125 struct xfrm_mark m;
1126
1127 p = nlmsg_data(nlh);
1128 err = verify_userspi_info(p);
1129 if (err)
1130 goto out_noput;
1131
1132 family = p->info.family;
1133 daddr = &p->info.id.daddr;
1134
1135 x = NULL;
1136
1137 mark = xfrm_mark_get(attrs, &m);
1138 if (p->info.seq) {
1139 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1140 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1141 xfrm_state_put(x);
1142 x = NULL;
1143 }
1144 }
1145
1146 if (!x)
1147 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1148 p->info.id.proto, daddr,
1149 &p->info.saddr, 1,
1150 family);
1151 err = -ENOENT;
1152 if (x == NULL)
1153 goto out_noput;
1154
1155 err = xfrm_alloc_spi(x, p->min, p->max);
1156 if (err)
1157 goto out;
1158
1159 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1160 if (IS_ERR(resp_skb)) {
1161 err = PTR_ERR(resp_skb);
1162 goto out;
1163 }
1164
1165 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1166
1167 out:
1168 xfrm_state_put(x);
1169 out_noput:
1170 return err;
1171 }
1172
1173 static int verify_policy_dir(u8 dir)
1174 {
1175 switch (dir) {
1176 case XFRM_POLICY_IN:
1177 case XFRM_POLICY_OUT:
1178 case XFRM_POLICY_FWD:
1179 break;
1180
1181 default:
1182 return -EINVAL;
1183 }
1184
1185 return 0;
1186 }
1187
1188 static int verify_policy_type(u8 type)
1189 {
1190 switch (type) {
1191 case XFRM_POLICY_TYPE_MAIN:
1192 #ifdef CONFIG_XFRM_SUB_POLICY
1193 case XFRM_POLICY_TYPE_SUB:
1194 #endif
1195 break;
1196
1197 default:
1198 return -EINVAL;
1199 }
1200
1201 return 0;
1202 }
1203
1204 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1205 {
1206 switch (p->share) {
1207 case XFRM_SHARE_ANY:
1208 case XFRM_SHARE_SESSION:
1209 case XFRM_SHARE_USER:
1210 case XFRM_SHARE_UNIQUE:
1211 break;
1212
1213 default:
1214 return -EINVAL;
1215 }
1216
1217 switch (p->action) {
1218 case XFRM_POLICY_ALLOW:
1219 case XFRM_POLICY_BLOCK:
1220 break;
1221
1222 default:
1223 return -EINVAL;
1224 }
1225
1226 switch (p->sel.family) {
1227 case AF_INET:
1228 break;
1229
1230 case AF_INET6:
1231 #if IS_ENABLED(CONFIG_IPV6)
1232 break;
1233 #else
1234 return -EAFNOSUPPORT;
1235 #endif
1236
1237 default:
1238 return -EINVAL;
1239 }
1240
1241 return verify_policy_dir(p->dir);
1242 }
1243
1244 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1245 {
1246 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1247 struct xfrm_user_sec_ctx *uctx;
1248
1249 if (!rt)
1250 return 0;
1251
1252 uctx = nla_data(rt);
1253 return security_xfrm_policy_alloc(&pol->security, uctx);
1254 }
1255
1256 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1257 int nr)
1258 {
1259 int i;
1260
1261 xp->xfrm_nr = nr;
1262 for (i = 0; i < nr; i++, ut++) {
1263 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1264
1265 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1266 memcpy(&t->saddr, &ut->saddr,
1267 sizeof(xfrm_address_t));
1268 t->reqid = ut->reqid;
1269 t->mode = ut->mode;
1270 t->share = ut->share;
1271 t->optional = ut->optional;
1272 t->aalgos = ut->aalgos;
1273 t->ealgos = ut->ealgos;
1274 t->calgos = ut->calgos;
1275 /* If all masks are ~0, then we allow all algorithms. */
1276 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1277 t->encap_family = ut->family;
1278 }
1279 }
1280
1281 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1282 {
1283 int i;
1284
1285 if (nr > XFRM_MAX_DEPTH)
1286 return -EINVAL;
1287
1288 for (i = 0; i < nr; i++) {
1289 /* We never validated the ut->family value, so many
1290 * applications simply leave it at zero. The check was
1291 * never made and ut->family was ignored because all
1292 * templates could be assumed to have the same family as
1293 * the policy itself. Now that we will have ipv4-in-ipv6
1294 * and ipv6-in-ipv4 tunnels, this is no longer true.
1295 */
1296 if (!ut[i].family)
1297 ut[i].family = family;
1298
1299 switch (ut[i].family) {
1300 case AF_INET:
1301 break;
1302 #if IS_ENABLED(CONFIG_IPV6)
1303 case AF_INET6:
1304 break;
1305 #endif
1306 default:
1307 return -EINVAL;
1308 }
1309 }
1310
1311 return 0;
1312 }
1313
1314 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1315 {
1316 struct nlattr *rt = attrs[XFRMA_TMPL];
1317
1318 if (!rt) {
1319 pol->xfrm_nr = 0;
1320 } else {
1321 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1322 int nr = nla_len(rt) / sizeof(*utmpl);
1323 int err;
1324
1325 err = validate_tmpl(nr, utmpl, pol->family);
1326 if (err)
1327 return err;
1328
1329 copy_templates(pol, utmpl, nr);
1330 }
1331 return 0;
1332 }
1333
1334 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1335 {
1336 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1337 struct xfrm_userpolicy_type *upt;
1338 u8 type = XFRM_POLICY_TYPE_MAIN;
1339 int err;
1340
1341 if (rt) {
1342 upt = nla_data(rt);
1343 type = upt->type;
1344 }
1345
1346 err = verify_policy_type(type);
1347 if (err)
1348 return err;
1349
1350 *tp = type;
1351 return 0;
1352 }
1353
1354 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1355 {
1356 xp->priority = p->priority;
1357 xp->index = p->index;
1358 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1359 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1360 xp->action = p->action;
1361 xp->flags = p->flags;
1362 xp->family = p->sel.family;
1363 /* XXX xp->share = p->share; */
1364 }
1365
1366 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1367 {
1368 memset(p, 0, sizeof(*p));
1369 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1370 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1371 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1372 p->priority = xp->priority;
1373 p->index = xp->index;
1374 p->sel.family = xp->family;
1375 p->dir = dir;
1376 p->action = xp->action;
1377 p->flags = xp->flags;
1378 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1379 }
1380
1381 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1382 {
1383 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1384 int err;
1385
1386 if (!xp) {
1387 *errp = -ENOMEM;
1388 return NULL;
1389 }
1390
1391 copy_from_user_policy(xp, p);
1392
1393 err = copy_from_user_policy_type(&xp->type, attrs);
1394 if (err)
1395 goto error;
1396
1397 if (!(err = copy_from_user_tmpl(xp, attrs)))
1398 err = copy_from_user_sec_ctx(xp, attrs);
1399 if (err)
1400 goto error;
1401
1402 xfrm_mark_get(attrs, &xp->mark);
1403
1404 return xp;
1405 error:
1406 *errp = err;
1407 xp->walk.dead = 1;
1408 xfrm_policy_destroy(xp);
1409 return NULL;
1410 }
1411
1412 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1413 struct nlattr **attrs)
1414 {
1415 struct net *net = sock_net(skb->sk);
1416 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1417 struct xfrm_policy *xp;
1418 struct km_event c;
1419 int err;
1420 int excl;
1421 kuid_t loginuid = audit_get_loginuid(current);
1422 u32 sessionid = audit_get_sessionid(current);
1423 u32 sid;
1424
1425 err = verify_newpolicy_info(p);
1426 if (err)
1427 return err;
1428 err = verify_sec_ctx_len(attrs);
1429 if (err)
1430 return err;
1431
1432 xp = xfrm_policy_construct(net, p, attrs, &err);
1433 if (!xp)
1434 return err;
1435
1436 /* shouldn't excl be based on nlh flags??
1437 * Aha! this is anti-netlink really i.e more pfkey derived
1438 * in netlink excl is a flag and you wouldnt need
1439 * a type XFRM_MSG_UPDPOLICY - JHS */
1440 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1441 err = xfrm_policy_insert(p->dir, xp, excl);
1442 security_task_getsecid(current, &sid);
1443 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1444
1445 if (err) {
1446 security_xfrm_policy_free(xp->security);
1447 kfree(xp);
1448 return err;
1449 }
1450
1451 c.event = nlh->nlmsg_type;
1452 c.seq = nlh->nlmsg_seq;
1453 c.portid = nlh->nlmsg_pid;
1454 km_policy_notify(xp, p->dir, &c);
1455
1456 xfrm_pol_put(xp);
1457
1458 return 0;
1459 }
1460
1461 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1462 {
1463 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1464 int i;
1465
1466 if (xp->xfrm_nr == 0)
1467 return 0;
1468
1469 for (i = 0; i < xp->xfrm_nr; i++) {
1470 struct xfrm_user_tmpl *up = &vec[i];
1471 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1472
1473 memset(up, 0, sizeof(*up));
1474 memcpy(&up->id, &kp->id, sizeof(up->id));
1475 up->family = kp->encap_family;
1476 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1477 up->reqid = kp->reqid;
1478 up->mode = kp->mode;
1479 up->share = kp->share;
1480 up->optional = kp->optional;
1481 up->aalgos = kp->aalgos;
1482 up->ealgos = kp->ealgos;
1483 up->calgos = kp->calgos;
1484 }
1485
1486 return nla_put(skb, XFRMA_TMPL,
1487 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1488 }
1489
1490 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1491 {
1492 if (x->security) {
1493 return copy_sec_ctx(x->security, skb);
1494 }
1495 return 0;
1496 }
1497
1498 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1499 {
1500 if (xp->security)
1501 return copy_sec_ctx(xp->security, skb);
1502 return 0;
1503 }
1504 static inline size_t userpolicy_type_attrsize(void)
1505 {
1506 #ifdef CONFIG_XFRM_SUB_POLICY
1507 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1508 #else
1509 return 0;
1510 #endif
1511 }
1512
1513 #ifdef CONFIG_XFRM_SUB_POLICY
1514 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1515 {
1516 struct xfrm_userpolicy_type upt = {
1517 .type = type,
1518 };
1519
1520 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1521 }
1522
1523 #else
1524 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1525 {
1526 return 0;
1527 }
1528 #endif
1529
1530 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1531 {
1532 struct xfrm_dump_info *sp = ptr;
1533 struct xfrm_userpolicy_info *p;
1534 struct sk_buff *in_skb = sp->in_skb;
1535 struct sk_buff *skb = sp->out_skb;
1536 struct nlmsghdr *nlh;
1537 int err;
1538
1539 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1540 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1541 if (nlh == NULL)
1542 return -EMSGSIZE;
1543
1544 p = nlmsg_data(nlh);
1545 copy_to_user_policy(xp, p, dir);
1546 err = copy_to_user_tmpl(xp, skb);
1547 if (!err)
1548 err = copy_to_user_sec_ctx(xp, skb);
1549 if (!err)
1550 err = copy_to_user_policy_type(xp->type, skb);
1551 if (!err)
1552 err = xfrm_mark_put(skb, &xp->mark);
1553 if (err) {
1554 nlmsg_cancel(skb, nlh);
1555 return err;
1556 }
1557 nlmsg_end(skb, nlh);
1558 return 0;
1559 }
1560
1561 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1562 {
1563 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1564
1565 xfrm_policy_walk_done(walk);
1566 return 0;
1567 }
1568
1569 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1570 {
1571 struct net *net = sock_net(skb->sk);
1572 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1573 struct xfrm_dump_info info;
1574
1575 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1576 sizeof(cb->args) - sizeof(cb->args[0]));
1577
1578 info.in_skb = cb->skb;
1579 info.out_skb = skb;
1580 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1581 info.nlmsg_flags = NLM_F_MULTI;
1582
1583 if (!cb->args[0]) {
1584 cb->args[0] = 1;
1585 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1586 }
1587
1588 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1589
1590 return skb->len;
1591 }
1592
1593 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1594 struct xfrm_policy *xp,
1595 int dir, u32 seq)
1596 {
1597 struct xfrm_dump_info info;
1598 struct sk_buff *skb;
1599 int err;
1600
1601 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1602 if (!skb)
1603 return ERR_PTR(-ENOMEM);
1604
1605 info.in_skb = in_skb;
1606 info.out_skb = skb;
1607 info.nlmsg_seq = seq;
1608 info.nlmsg_flags = 0;
1609
1610 err = dump_one_policy(xp, dir, 0, &info);
1611 if (err) {
1612 kfree_skb(skb);
1613 return ERR_PTR(err);
1614 }
1615
1616 return skb;
1617 }
1618
1619 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1620 struct nlattr **attrs)
1621 {
1622 struct net *net = sock_net(skb->sk);
1623 struct xfrm_policy *xp;
1624 struct xfrm_userpolicy_id *p;
1625 u8 type = XFRM_POLICY_TYPE_MAIN;
1626 int err;
1627 struct km_event c;
1628 int delete;
1629 struct xfrm_mark m;
1630 u32 mark = xfrm_mark_get(attrs, &m);
1631
1632 p = nlmsg_data(nlh);
1633 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1634
1635 err = copy_from_user_policy_type(&type, attrs);
1636 if (err)
1637 return err;
1638
1639 err = verify_policy_dir(p->dir);
1640 if (err)
1641 return err;
1642
1643 if (p->index)
1644 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1645 else {
1646 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1647 struct xfrm_sec_ctx *ctx;
1648
1649 err = verify_sec_ctx_len(attrs);
1650 if (err)
1651 return err;
1652
1653 ctx = NULL;
1654 if (rt) {
1655 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1656
1657 err = security_xfrm_policy_alloc(&ctx, uctx);
1658 if (err)
1659 return err;
1660 }
1661 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1662 ctx, delete, &err);
1663 security_xfrm_policy_free(ctx);
1664 }
1665 if (xp == NULL)
1666 return -ENOENT;
1667
1668 if (!delete) {
1669 struct sk_buff *resp_skb;
1670
1671 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1672 if (IS_ERR(resp_skb)) {
1673 err = PTR_ERR(resp_skb);
1674 } else {
1675 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1676 NETLINK_CB(skb).portid);
1677 }
1678 } else {
1679 kuid_t loginuid = audit_get_loginuid(current);
1680 u32 sessionid = audit_get_sessionid(current);
1681 u32 sid;
1682
1683 security_task_getsecid(current, &sid);
1684 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1685 sid);
1686
1687 if (err != 0)
1688 goto out;
1689
1690 c.data.byid = p->index;
1691 c.event = nlh->nlmsg_type;
1692 c.seq = nlh->nlmsg_seq;
1693 c.portid = nlh->nlmsg_pid;
1694 km_policy_notify(xp, p->dir, &c);
1695 }
1696
1697 out:
1698 xfrm_pol_put(xp);
1699 if (delete && err == 0)
1700 xfrm_garbage_collect(net);
1701 return err;
1702 }
1703
1704 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1705 struct nlattr **attrs)
1706 {
1707 struct net *net = sock_net(skb->sk);
1708 struct km_event c;
1709 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1710 struct xfrm_audit audit_info;
1711 int err;
1712
1713 audit_info.loginuid = audit_get_loginuid(current);
1714 audit_info.sessionid = audit_get_sessionid(current);
1715 security_task_getsecid(current, &audit_info.secid);
1716 err = xfrm_state_flush(net, p->proto, &audit_info);
1717 if (err) {
1718 if (err == -ESRCH) /* empty table */
1719 return 0;
1720 return err;
1721 }
1722 c.data.proto = p->proto;
1723 c.event = nlh->nlmsg_type;
1724 c.seq = nlh->nlmsg_seq;
1725 c.portid = nlh->nlmsg_pid;
1726 c.net = net;
1727 km_state_notify(NULL, &c);
1728
1729 return 0;
1730 }
1731
1732 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1733 {
1734 size_t replay_size = x->replay_esn ?
1735 xfrm_replay_state_esn_len(x->replay_esn) :
1736 sizeof(struct xfrm_replay_state);
1737
1738 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1739 + nla_total_size(replay_size)
1740 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1741 + nla_total_size(sizeof(struct xfrm_mark))
1742 + nla_total_size(4) /* XFRM_AE_RTHR */
1743 + nla_total_size(4); /* XFRM_AE_ETHR */
1744 }
1745
1746 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1747 {
1748 struct xfrm_aevent_id *id;
1749 struct nlmsghdr *nlh;
1750 int err;
1751
1752 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1753 if (nlh == NULL)
1754 return -EMSGSIZE;
1755
1756 id = nlmsg_data(nlh);
1757 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1758 id->sa_id.spi = x->id.spi;
1759 id->sa_id.family = x->props.family;
1760 id->sa_id.proto = x->id.proto;
1761 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1762 id->reqid = x->props.reqid;
1763 id->flags = c->data.aevent;
1764
1765 if (x->replay_esn) {
1766 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1767 xfrm_replay_state_esn_len(x->replay_esn),
1768 x->replay_esn);
1769 } else {
1770 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1771 &x->replay);
1772 }
1773 if (err)
1774 goto out_cancel;
1775 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1776 if (err)
1777 goto out_cancel;
1778
1779 if (id->flags & XFRM_AE_RTHR) {
1780 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1781 if (err)
1782 goto out_cancel;
1783 }
1784 if (id->flags & XFRM_AE_ETHR) {
1785 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1786 x->replay_maxage * 10 / HZ);
1787 if (err)
1788 goto out_cancel;
1789 }
1790 err = xfrm_mark_put(skb, &x->mark);
1791 if (err)
1792 goto out_cancel;
1793
1794 return nlmsg_end(skb, nlh);
1795
1796 out_cancel:
1797 nlmsg_cancel(skb, nlh);
1798 return err;
1799 }
1800
1801 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1802 struct nlattr **attrs)
1803 {
1804 struct net *net = sock_net(skb->sk);
1805 struct xfrm_state *x;
1806 struct sk_buff *r_skb;
1807 int err;
1808 struct km_event c;
1809 u32 mark;
1810 struct xfrm_mark m;
1811 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1812 struct xfrm_usersa_id *id = &p->sa_id;
1813
1814 mark = xfrm_mark_get(attrs, &m);
1815
1816 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1817 if (x == NULL)
1818 return -ESRCH;
1819
1820 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1821 if (r_skb == NULL) {
1822 xfrm_state_put(x);
1823 return -ENOMEM;
1824 }
1825
1826 /*
1827 * XXX: is this lock really needed - none of the other
1828 * gets lock (the concern is things getting updated
1829 * while we are still reading) - jhs
1830 */
1831 spin_lock_bh(&x->lock);
1832 c.data.aevent = p->flags;
1833 c.seq = nlh->nlmsg_seq;
1834 c.portid = nlh->nlmsg_pid;
1835
1836 if (build_aevent(r_skb, x, &c) < 0)
1837 BUG();
1838 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1839 spin_unlock_bh(&x->lock);
1840 xfrm_state_put(x);
1841 return err;
1842 }
1843
1844 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1845 struct nlattr **attrs)
1846 {
1847 struct net *net = sock_net(skb->sk);
1848 struct xfrm_state *x;
1849 struct km_event c;
1850 int err = - EINVAL;
1851 u32 mark = 0;
1852 struct xfrm_mark m;
1853 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1854 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1855 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1856 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1857
1858 if (!lt && !rp && !re)
1859 return err;
1860
1861 /* pedantic mode - thou shalt sayeth replaceth */
1862 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1863 return err;
1864
1865 mark = xfrm_mark_get(attrs, &m);
1866
1867 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1868 if (x == NULL)
1869 return -ESRCH;
1870
1871 if (x->km.state != XFRM_STATE_VALID)
1872 goto out;
1873
1874 err = xfrm_replay_verify_len(x->replay_esn, re);
1875 if (err)
1876 goto out;
1877
1878 spin_lock_bh(&x->lock);
1879 xfrm_update_ae_params(x, attrs, 1);
1880 spin_unlock_bh(&x->lock);
1881
1882 c.event = nlh->nlmsg_type;
1883 c.seq = nlh->nlmsg_seq;
1884 c.portid = nlh->nlmsg_pid;
1885 c.data.aevent = XFRM_AE_CU;
1886 km_state_notify(x, &c);
1887 err = 0;
1888 out:
1889 xfrm_state_put(x);
1890 return err;
1891 }
1892
1893 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1894 struct nlattr **attrs)
1895 {
1896 struct net *net = sock_net(skb->sk);
1897 struct km_event c;
1898 u8 type = XFRM_POLICY_TYPE_MAIN;
1899 int err;
1900 struct xfrm_audit audit_info;
1901
1902 err = copy_from_user_policy_type(&type, attrs);
1903 if (err)
1904 return err;
1905
1906 audit_info.loginuid = audit_get_loginuid(current);
1907 audit_info.sessionid = audit_get_sessionid(current);
1908 security_task_getsecid(current, &audit_info.secid);
1909 err = xfrm_policy_flush(net, type, &audit_info);
1910 if (err) {
1911 if (err == -ESRCH) /* empty table */
1912 return 0;
1913 return err;
1914 }
1915
1916 c.data.type = type;
1917 c.event = nlh->nlmsg_type;
1918 c.seq = nlh->nlmsg_seq;
1919 c.portid = nlh->nlmsg_pid;
1920 c.net = net;
1921 km_policy_notify(NULL, 0, &c);
1922 return 0;
1923 }
1924
1925 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1926 struct nlattr **attrs)
1927 {
1928 struct net *net = sock_net(skb->sk);
1929 struct xfrm_policy *xp;
1930 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1931 struct xfrm_userpolicy_info *p = &up->pol;
1932 u8 type = XFRM_POLICY_TYPE_MAIN;
1933 int err = -ENOENT;
1934 struct xfrm_mark m;
1935 u32 mark = xfrm_mark_get(attrs, &m);
1936
1937 err = copy_from_user_policy_type(&type, attrs);
1938 if (err)
1939 return err;
1940
1941 err = verify_policy_dir(p->dir);
1942 if (err)
1943 return err;
1944
1945 if (p->index)
1946 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1947 else {
1948 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1949 struct xfrm_sec_ctx *ctx;
1950
1951 err = verify_sec_ctx_len(attrs);
1952 if (err)
1953 return err;
1954
1955 ctx = NULL;
1956 if (rt) {
1957 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1958
1959 err = security_xfrm_policy_alloc(&ctx, uctx);
1960 if (err)
1961 return err;
1962 }
1963 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1964 &p->sel, ctx, 0, &err);
1965 security_xfrm_policy_free(ctx);
1966 }
1967 if (xp == NULL)
1968 return -ENOENT;
1969
1970 if (unlikely(xp->walk.dead))
1971 goto out;
1972
1973 err = 0;
1974 if (up->hard) {
1975 kuid_t loginuid = audit_get_loginuid(current);
1976 u32 sessionid = audit_get_sessionid(current);
1977 u32 sid;
1978
1979 security_task_getsecid(current, &sid);
1980 xfrm_policy_delete(xp, p->dir);
1981 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1982
1983 } else {
1984 // reset the timers here?
1985 WARN(1, "Dont know what to do with soft policy expire\n");
1986 }
1987 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1988
1989 out:
1990 xfrm_pol_put(xp);
1991 return err;
1992 }
1993
1994 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1995 struct nlattr **attrs)
1996 {
1997 struct net *net = sock_net(skb->sk);
1998 struct xfrm_state *x;
1999 int err;
2000 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2001 struct xfrm_usersa_info *p = &ue->state;
2002 struct xfrm_mark m;
2003 u32 mark = xfrm_mark_get(attrs, &m);
2004
2005 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2006
2007 err = -ENOENT;
2008 if (x == NULL)
2009 return err;
2010
2011 spin_lock_bh(&x->lock);
2012 err = -EINVAL;
2013 if (x->km.state != XFRM_STATE_VALID)
2014 goto out;
2015 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2016
2017 if (ue->hard) {
2018 kuid_t loginuid = audit_get_loginuid(current);
2019 u32 sessionid = audit_get_sessionid(current);
2020 u32 sid;
2021
2022 security_task_getsecid(current, &sid);
2023 __xfrm_state_delete(x);
2024 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
2025 }
2026 err = 0;
2027 out:
2028 spin_unlock_bh(&x->lock);
2029 xfrm_state_put(x);
2030 return err;
2031 }
2032
2033 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2034 struct nlattr **attrs)
2035 {
2036 struct net *net = sock_net(skb->sk);
2037 struct xfrm_policy *xp;
2038 struct xfrm_user_tmpl *ut;
2039 int i;
2040 struct nlattr *rt = attrs[XFRMA_TMPL];
2041 struct xfrm_mark mark;
2042
2043 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2044 struct xfrm_state *x = xfrm_state_alloc(net);
2045 int err = -ENOMEM;
2046
2047 if (!x)
2048 goto nomem;
2049
2050 xfrm_mark_get(attrs, &mark);
2051
2052 err = verify_newpolicy_info(&ua->policy);
2053 if (err)
2054 goto bad_policy;
2055
2056 /* build an XP */
2057 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2058 if (!xp)
2059 goto free_state;
2060
2061 memcpy(&x->id, &ua->id, sizeof(ua->id));
2062 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2063 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2064 xp->mark.m = x->mark.m = mark.m;
2065 xp->mark.v = x->mark.v = mark.v;
2066 ut = nla_data(rt);
2067 /* extract the templates and for each call km_key */
2068 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2069 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2070 memcpy(&x->id, &t->id, sizeof(x->id));
2071 x->props.mode = t->mode;
2072 x->props.reqid = t->reqid;
2073 x->props.family = ut->family;
2074 t->aalgos = ua->aalgos;
2075 t->ealgos = ua->ealgos;
2076 t->calgos = ua->calgos;
2077 err = km_query(x, t, xp);
2078
2079 }
2080
2081 kfree(x);
2082 kfree(xp);
2083
2084 return 0;
2085
2086 bad_policy:
2087 WARN(1, "BAD policy passed\n");
2088 free_state:
2089 kfree(x);
2090 nomem:
2091 return err;
2092 }
2093
2094 #ifdef CONFIG_XFRM_MIGRATE
2095 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2096 struct xfrm_kmaddress *k,
2097 struct nlattr **attrs, int *num)
2098 {
2099 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2100 struct xfrm_user_migrate *um;
2101 int i, num_migrate;
2102
2103 if (k != NULL) {
2104 struct xfrm_user_kmaddress *uk;
2105
2106 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2107 memcpy(&k->local, &uk->local, sizeof(k->local));
2108 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2109 k->family = uk->family;
2110 k->reserved = uk->reserved;
2111 }
2112
2113 um = nla_data(rt);
2114 num_migrate = nla_len(rt) / sizeof(*um);
2115
2116 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2117 return -EINVAL;
2118
2119 for (i = 0; i < num_migrate; i++, um++, ma++) {
2120 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2121 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2122 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2123 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2124
2125 ma->proto = um->proto;
2126 ma->mode = um->mode;
2127 ma->reqid = um->reqid;
2128
2129 ma->old_family = um->old_family;
2130 ma->new_family = um->new_family;
2131 }
2132
2133 *num = i;
2134 return 0;
2135 }
2136
2137 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2138 struct nlattr **attrs)
2139 {
2140 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2141 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2142 struct xfrm_kmaddress km, *kmp;
2143 u8 type;
2144 int err;
2145 int n = 0;
2146
2147 if (attrs[XFRMA_MIGRATE] == NULL)
2148 return -EINVAL;
2149
2150 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2151
2152 err = copy_from_user_policy_type(&type, attrs);
2153 if (err)
2154 return err;
2155
2156 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2157 if (err)
2158 return err;
2159
2160 if (!n)
2161 return 0;
2162
2163 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2164
2165 return 0;
2166 }
2167 #else
2168 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2169 struct nlattr **attrs)
2170 {
2171 return -ENOPROTOOPT;
2172 }
2173 #endif
2174
2175 #ifdef CONFIG_XFRM_MIGRATE
2176 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2177 {
2178 struct xfrm_user_migrate um;
2179
2180 memset(&um, 0, sizeof(um));
2181 um.proto = m->proto;
2182 um.mode = m->mode;
2183 um.reqid = m->reqid;
2184 um.old_family = m->old_family;
2185 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2186 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2187 um.new_family = m->new_family;
2188 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2189 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2190
2191 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2192 }
2193
2194 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2195 {
2196 struct xfrm_user_kmaddress uk;
2197
2198 memset(&uk, 0, sizeof(uk));
2199 uk.family = k->family;
2200 uk.reserved = k->reserved;
2201 memcpy(&uk.local, &k->local, sizeof(uk.local));
2202 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2203
2204 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2205 }
2206
2207 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2208 {
2209 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2210 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2211 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2212 + userpolicy_type_attrsize();
2213 }
2214
2215 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2216 int num_migrate, const struct xfrm_kmaddress *k,
2217 const struct xfrm_selector *sel, u8 dir, u8 type)
2218 {
2219 const struct xfrm_migrate *mp;
2220 struct xfrm_userpolicy_id *pol_id;
2221 struct nlmsghdr *nlh;
2222 int i, err;
2223
2224 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2225 if (nlh == NULL)
2226 return -EMSGSIZE;
2227
2228 pol_id = nlmsg_data(nlh);
2229 /* copy data from selector, dir, and type to the pol_id */
2230 memset(pol_id, 0, sizeof(*pol_id));
2231 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2232 pol_id->dir = dir;
2233
2234 if (k != NULL) {
2235 err = copy_to_user_kmaddress(k, skb);
2236 if (err)
2237 goto out_cancel;
2238 }
2239 err = copy_to_user_policy_type(type, skb);
2240 if (err)
2241 goto out_cancel;
2242 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2243 err = copy_to_user_migrate(mp, skb);
2244 if (err)
2245 goto out_cancel;
2246 }
2247
2248 return nlmsg_end(skb, nlh);
2249
2250 out_cancel:
2251 nlmsg_cancel(skb, nlh);
2252 return err;
2253 }
2254
2255 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2256 const struct xfrm_migrate *m, int num_migrate,
2257 const struct xfrm_kmaddress *k)
2258 {
2259 struct net *net = &init_net;
2260 struct sk_buff *skb;
2261
2262 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2263 if (skb == NULL)
2264 return -ENOMEM;
2265
2266 /* build migrate */
2267 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2268 BUG();
2269
2270 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2271 }
2272 #else
2273 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2274 const struct xfrm_migrate *m, int num_migrate,
2275 const struct xfrm_kmaddress *k)
2276 {
2277 return -ENOPROTOOPT;
2278 }
2279 #endif
2280
2281 #define XMSGSIZE(type) sizeof(struct type)
2282
2283 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2284 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2285 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2286 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2287 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2288 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2289 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2290 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2291 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2292 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2293 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2294 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2295 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2296 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2297 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2298 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2299 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2300 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2301 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2302 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2303 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2304 };
2305
2306 #undef XMSGSIZE
2307
2308 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2309 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2310 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2311 [XFRMA_LASTUSED] = { .type = NLA_U64},
2312 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2313 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2314 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2315 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2316 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2317 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2318 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2319 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2320 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2321 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2322 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2323 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2324 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2325 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2326 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2327 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2328 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2329 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2330 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2331 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2332 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2333 };
2334
2335 static const struct xfrm_link {
2336 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2337 int (*dump)(struct sk_buff *, struct netlink_callback *);
2338 int (*done)(struct netlink_callback *);
2339 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2340 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2341 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2342 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2343 .dump = xfrm_dump_sa,
2344 .done = xfrm_dump_sa_done },
2345 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2346 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2347 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2348 .dump = xfrm_dump_policy,
2349 .done = xfrm_dump_policy_done },
2350 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2351 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2352 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2353 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2354 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2355 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2356 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2357 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2358 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2359 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2360 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2361 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2362 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2363 };
2364
2365 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2366 {
2367 struct net *net = sock_net(skb->sk);
2368 struct nlattr *attrs[XFRMA_MAX+1];
2369 const struct xfrm_link *link;
2370 int type, err;
2371
2372 type = nlh->nlmsg_type;
2373 if (type > XFRM_MSG_MAX)
2374 return -EINVAL;
2375
2376 type -= XFRM_MSG_BASE;
2377 link = &xfrm_dispatch[type];
2378
2379 /* All operations require privileges, even GET */
2380 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2381 return -EPERM;
2382
2383 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2384 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2385 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2386 if (link->dump == NULL)
2387 return -EINVAL;
2388
2389 {
2390 struct netlink_dump_control c = {
2391 .dump = link->dump,
2392 .done = link->done,
2393 };
2394 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2395 }
2396 }
2397
2398 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2399 xfrma_policy);
2400 if (err < 0)
2401 return err;
2402
2403 if (link->doit == NULL)
2404 return -EINVAL;
2405
2406 return link->doit(skb, nlh, attrs);
2407 }
2408
2409 static void xfrm_netlink_rcv(struct sk_buff *skb)
2410 {
2411 mutex_lock(&xfrm_cfg_mutex);
2412 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2413 mutex_unlock(&xfrm_cfg_mutex);
2414 }
2415
2416 static inline size_t xfrm_expire_msgsize(void)
2417 {
2418 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2419 + nla_total_size(sizeof(struct xfrm_mark));
2420 }
2421
2422 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2423 {
2424 struct xfrm_user_expire *ue;
2425 struct nlmsghdr *nlh;
2426 int err;
2427
2428 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2429 if (nlh == NULL)
2430 return -EMSGSIZE;
2431
2432 ue = nlmsg_data(nlh);
2433 copy_to_user_state(x, &ue->state);
2434 ue->hard = (c->data.hard != 0) ? 1 : 0;
2435
2436 err = xfrm_mark_put(skb, &x->mark);
2437 if (err)
2438 return err;
2439
2440 return nlmsg_end(skb, nlh);
2441 }
2442
2443 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2444 {
2445 struct net *net = xs_net(x);
2446 struct sk_buff *skb;
2447
2448 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2449 if (skb == NULL)
2450 return -ENOMEM;
2451
2452 if (build_expire(skb, x, c) < 0) {
2453 kfree_skb(skb);
2454 return -EMSGSIZE;
2455 }
2456
2457 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2458 }
2459
2460 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2461 {
2462 struct net *net = xs_net(x);
2463 struct sk_buff *skb;
2464
2465 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2466 if (skb == NULL)
2467 return -ENOMEM;
2468
2469 if (build_aevent(skb, x, c) < 0)
2470 BUG();
2471
2472 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2473 }
2474
2475 static int xfrm_notify_sa_flush(const struct km_event *c)
2476 {
2477 struct net *net = c->net;
2478 struct xfrm_usersa_flush *p;
2479 struct nlmsghdr *nlh;
2480 struct sk_buff *skb;
2481 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2482
2483 skb = nlmsg_new(len, GFP_ATOMIC);
2484 if (skb == NULL)
2485 return -ENOMEM;
2486
2487 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2488 if (nlh == NULL) {
2489 kfree_skb(skb);
2490 return -EMSGSIZE;
2491 }
2492
2493 p = nlmsg_data(nlh);
2494 p->proto = c->data.proto;
2495
2496 nlmsg_end(skb, nlh);
2497
2498 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2499 }
2500
2501 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2502 {
2503 size_t l = 0;
2504 if (x->aead)
2505 l += nla_total_size(aead_len(x->aead));
2506 if (x->aalg) {
2507 l += nla_total_size(sizeof(struct xfrm_algo) +
2508 (x->aalg->alg_key_len + 7) / 8);
2509 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2510 }
2511 if (x->ealg)
2512 l += nla_total_size(xfrm_alg_len(x->ealg));
2513 if (x->calg)
2514 l += nla_total_size(sizeof(*x->calg));
2515 if (x->encap)
2516 l += nla_total_size(sizeof(*x->encap));
2517 if (x->tfcpad)
2518 l += nla_total_size(sizeof(x->tfcpad));
2519 if (x->replay_esn)
2520 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2521 if (x->security)
2522 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2523 x->security->ctx_len);
2524 if (x->coaddr)
2525 l += nla_total_size(sizeof(*x->coaddr));
2526 if (x->props.extra_flags)
2527 l += nla_total_size(sizeof(x->props.extra_flags));
2528
2529 /* Must count x->lastused as it may become non-zero behind our back. */
2530 l += nla_total_size(sizeof(u64));
2531
2532 return l;
2533 }
2534
2535 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2536 {
2537 struct net *net = xs_net(x);
2538 struct xfrm_usersa_info *p;
2539 struct xfrm_usersa_id *id;
2540 struct nlmsghdr *nlh;
2541 struct sk_buff *skb;
2542 int len = xfrm_sa_len(x);
2543 int headlen, err;
2544
2545 headlen = sizeof(*p);
2546 if (c->event == XFRM_MSG_DELSA) {
2547 len += nla_total_size(headlen);
2548 headlen = sizeof(*id);
2549 len += nla_total_size(sizeof(struct xfrm_mark));
2550 }
2551 len += NLMSG_ALIGN(headlen);
2552
2553 skb = nlmsg_new(len, GFP_ATOMIC);
2554 if (skb == NULL)
2555 return -ENOMEM;
2556
2557 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2558 err = -EMSGSIZE;
2559 if (nlh == NULL)
2560 goto out_free_skb;
2561
2562 p = nlmsg_data(nlh);
2563 if (c->event == XFRM_MSG_DELSA) {
2564 struct nlattr *attr;
2565
2566 id = nlmsg_data(nlh);
2567 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2568 id->spi = x->id.spi;
2569 id->family = x->props.family;
2570 id->proto = x->id.proto;
2571
2572 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2573 err = -EMSGSIZE;
2574 if (attr == NULL)
2575 goto out_free_skb;
2576
2577 p = nla_data(attr);
2578 }
2579 err = copy_to_user_state_extra(x, p, skb);
2580 if (err)
2581 goto out_free_skb;
2582
2583 nlmsg_end(skb, nlh);
2584
2585 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2586
2587 out_free_skb:
2588 kfree_skb(skb);
2589 return err;
2590 }
2591
2592 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2593 {
2594
2595 switch (c->event) {
2596 case XFRM_MSG_EXPIRE:
2597 return xfrm_exp_state_notify(x, c);
2598 case XFRM_MSG_NEWAE:
2599 return xfrm_aevent_state_notify(x, c);
2600 case XFRM_MSG_DELSA:
2601 case XFRM_MSG_UPDSA:
2602 case XFRM_MSG_NEWSA:
2603 return xfrm_notify_sa(x, c);
2604 case XFRM_MSG_FLUSHSA:
2605 return xfrm_notify_sa_flush(c);
2606 default:
2607 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2608 c->event);
2609 break;
2610 }
2611
2612 return 0;
2613
2614 }
2615
2616 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2617 struct xfrm_policy *xp)
2618 {
2619 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2620 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2621 + nla_total_size(sizeof(struct xfrm_mark))
2622 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2623 + userpolicy_type_attrsize();
2624 }
2625
2626 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2627 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2628 {
2629 __u32 seq = xfrm_get_acqseq();
2630 struct xfrm_user_acquire *ua;
2631 struct nlmsghdr *nlh;
2632 int err;
2633
2634 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2635 if (nlh == NULL)
2636 return -EMSGSIZE;
2637
2638 ua = nlmsg_data(nlh);
2639 memcpy(&ua->id, &x->id, sizeof(ua->id));
2640 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2641 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2642 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2643 ua->aalgos = xt->aalgos;
2644 ua->ealgos = xt->ealgos;
2645 ua->calgos = xt->calgos;
2646 ua->seq = x->km.seq = seq;
2647
2648 err = copy_to_user_tmpl(xp, skb);
2649 if (!err)
2650 err = copy_to_user_state_sec_ctx(x, skb);
2651 if (!err)
2652 err = copy_to_user_policy_type(xp->type, skb);
2653 if (!err)
2654 err = xfrm_mark_put(skb, &xp->mark);
2655 if (err) {
2656 nlmsg_cancel(skb, nlh);
2657 return err;
2658 }
2659
2660 return nlmsg_end(skb, nlh);
2661 }
2662
2663 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2664 struct xfrm_policy *xp)
2665 {
2666 struct net *net = xs_net(x);
2667 struct sk_buff *skb;
2668
2669 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2670 if (skb == NULL)
2671 return -ENOMEM;
2672
2673 if (build_acquire(skb, x, xt, xp) < 0)
2674 BUG();
2675
2676 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2677 }
2678
2679 /* User gives us xfrm_user_policy_info followed by an array of 0
2680 * or more templates.
2681 */
2682 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2683 u8 *data, int len, int *dir)
2684 {
2685 struct net *net = sock_net(sk);
2686 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2687 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2688 struct xfrm_policy *xp;
2689 int nr;
2690
2691 switch (sk->sk_family) {
2692 case AF_INET:
2693 if (opt != IP_XFRM_POLICY) {
2694 *dir = -EOPNOTSUPP;
2695 return NULL;
2696 }
2697 break;
2698 #if IS_ENABLED(CONFIG_IPV6)
2699 case AF_INET6:
2700 if (opt != IPV6_XFRM_POLICY) {
2701 *dir = -EOPNOTSUPP;
2702 return NULL;
2703 }
2704 break;
2705 #endif
2706 default:
2707 *dir = -EINVAL;
2708 return NULL;
2709 }
2710
2711 *dir = -EINVAL;
2712
2713 if (len < sizeof(*p) ||
2714 verify_newpolicy_info(p))
2715 return NULL;
2716
2717 nr = ((len - sizeof(*p)) / sizeof(*ut));
2718 if (validate_tmpl(nr, ut, p->sel.family))
2719 return NULL;
2720
2721 if (p->dir > XFRM_POLICY_OUT)
2722 return NULL;
2723
2724 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2725 if (xp == NULL) {
2726 *dir = -ENOBUFS;
2727 return NULL;
2728 }
2729
2730 copy_from_user_policy(xp, p);
2731 xp->type = XFRM_POLICY_TYPE_MAIN;
2732 copy_templates(xp, ut, nr);
2733
2734 *dir = p->dir;
2735
2736 return xp;
2737 }
2738
2739 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2740 {
2741 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2742 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2743 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2744 + nla_total_size(sizeof(struct xfrm_mark))
2745 + userpolicy_type_attrsize();
2746 }
2747
2748 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2749 int dir, const struct km_event *c)
2750 {
2751 struct xfrm_user_polexpire *upe;
2752 int hard = c->data.hard;
2753 struct nlmsghdr *nlh;
2754 int err;
2755
2756 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2757 if (nlh == NULL)
2758 return -EMSGSIZE;
2759
2760 upe = nlmsg_data(nlh);
2761 copy_to_user_policy(xp, &upe->pol, dir);
2762 err = copy_to_user_tmpl(xp, skb);
2763 if (!err)
2764 err = copy_to_user_sec_ctx(xp, skb);
2765 if (!err)
2766 err = copy_to_user_policy_type(xp->type, skb);
2767 if (!err)
2768 err = xfrm_mark_put(skb, &xp->mark);
2769 if (err) {
2770 nlmsg_cancel(skb, nlh);
2771 return err;
2772 }
2773 upe->hard = !!hard;
2774
2775 return nlmsg_end(skb, nlh);
2776 }
2777
2778 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2779 {
2780 struct net *net = xp_net(xp);
2781 struct sk_buff *skb;
2782
2783 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2784 if (skb == NULL)
2785 return -ENOMEM;
2786
2787 if (build_polexpire(skb, xp, dir, c) < 0)
2788 BUG();
2789
2790 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2791 }
2792
2793 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2794 {
2795 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2796 struct net *net = xp_net(xp);
2797 struct xfrm_userpolicy_info *p;
2798 struct xfrm_userpolicy_id *id;
2799 struct nlmsghdr *nlh;
2800 struct sk_buff *skb;
2801 int headlen, err;
2802
2803 headlen = sizeof(*p);
2804 if (c->event == XFRM_MSG_DELPOLICY) {
2805 len += nla_total_size(headlen);
2806 headlen = sizeof(*id);
2807 }
2808 len += userpolicy_type_attrsize();
2809 len += nla_total_size(sizeof(struct xfrm_mark));
2810 len += NLMSG_ALIGN(headlen);
2811
2812 skb = nlmsg_new(len, GFP_ATOMIC);
2813 if (skb == NULL)
2814 return -ENOMEM;
2815
2816 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2817 err = -EMSGSIZE;
2818 if (nlh == NULL)
2819 goto out_free_skb;
2820
2821 p = nlmsg_data(nlh);
2822 if (c->event == XFRM_MSG_DELPOLICY) {
2823 struct nlattr *attr;
2824
2825 id = nlmsg_data(nlh);
2826 memset(id, 0, sizeof(*id));
2827 id->dir = dir;
2828 if (c->data.byid)
2829 id->index = xp->index;
2830 else
2831 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2832
2833 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2834 err = -EMSGSIZE;
2835 if (attr == NULL)
2836 goto out_free_skb;
2837
2838 p = nla_data(attr);
2839 }
2840
2841 copy_to_user_policy(xp, p, dir);
2842 err = copy_to_user_tmpl(xp, skb);
2843 if (!err)
2844 err = copy_to_user_policy_type(xp->type, skb);
2845 if (!err)
2846 err = xfrm_mark_put(skb, &xp->mark);
2847 if (err)
2848 goto out_free_skb;
2849
2850 nlmsg_end(skb, nlh);
2851
2852 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2853
2854 out_free_skb:
2855 kfree_skb(skb);
2856 return err;
2857 }
2858
2859 static int xfrm_notify_policy_flush(const struct km_event *c)
2860 {
2861 struct net *net = c->net;
2862 struct nlmsghdr *nlh;
2863 struct sk_buff *skb;
2864 int err;
2865
2866 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2867 if (skb == NULL)
2868 return -ENOMEM;
2869
2870 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2871 err = -EMSGSIZE;
2872 if (nlh == NULL)
2873 goto out_free_skb;
2874 err = copy_to_user_policy_type(c->data.type, skb);
2875 if (err)
2876 goto out_free_skb;
2877
2878 nlmsg_end(skb, nlh);
2879
2880 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2881
2882 out_free_skb:
2883 kfree_skb(skb);
2884 return err;
2885 }
2886
2887 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2888 {
2889
2890 switch (c->event) {
2891 case XFRM_MSG_NEWPOLICY:
2892 case XFRM_MSG_UPDPOLICY:
2893 case XFRM_MSG_DELPOLICY:
2894 return xfrm_notify_policy(xp, dir, c);
2895 case XFRM_MSG_FLUSHPOLICY:
2896 return xfrm_notify_policy_flush(c);
2897 case XFRM_MSG_POLEXPIRE:
2898 return xfrm_exp_policy_notify(xp, dir, c);
2899 default:
2900 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2901 c->event);
2902 }
2903
2904 return 0;
2905
2906 }
2907
2908 static inline size_t xfrm_report_msgsize(void)
2909 {
2910 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2911 }
2912
2913 static int build_report(struct sk_buff *skb, u8 proto,
2914 struct xfrm_selector *sel, xfrm_address_t *addr)
2915 {
2916 struct xfrm_user_report *ur;
2917 struct nlmsghdr *nlh;
2918
2919 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2920 if (nlh == NULL)
2921 return -EMSGSIZE;
2922
2923 ur = nlmsg_data(nlh);
2924 ur->proto = proto;
2925 memcpy(&ur->sel, sel, sizeof(ur->sel));
2926
2927 if (addr) {
2928 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2929 if (err) {
2930 nlmsg_cancel(skb, nlh);
2931 return err;
2932 }
2933 }
2934 return nlmsg_end(skb, nlh);
2935 }
2936
2937 static int xfrm_send_report(struct net *net, u8 proto,
2938 struct xfrm_selector *sel, xfrm_address_t *addr)
2939 {
2940 struct sk_buff *skb;
2941
2942 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2943 if (skb == NULL)
2944 return -ENOMEM;
2945
2946 if (build_report(skb, proto, sel, addr) < 0)
2947 BUG();
2948
2949 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
2950 }
2951
2952 static inline size_t xfrm_mapping_msgsize(void)
2953 {
2954 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2955 }
2956
2957 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2958 xfrm_address_t *new_saddr, __be16 new_sport)
2959 {
2960 struct xfrm_user_mapping *um;
2961 struct nlmsghdr *nlh;
2962
2963 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2964 if (nlh == NULL)
2965 return -EMSGSIZE;
2966
2967 um = nlmsg_data(nlh);
2968
2969 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2970 um->id.spi = x->id.spi;
2971 um->id.family = x->props.family;
2972 um->id.proto = x->id.proto;
2973 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2974 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2975 um->new_sport = new_sport;
2976 um->old_sport = x->encap->encap_sport;
2977 um->reqid = x->props.reqid;
2978
2979 return nlmsg_end(skb, nlh);
2980 }
2981
2982 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2983 __be16 sport)
2984 {
2985 struct net *net = xs_net(x);
2986 struct sk_buff *skb;
2987
2988 if (x->id.proto != IPPROTO_ESP)
2989 return -EINVAL;
2990
2991 if (!x->encap)
2992 return -EINVAL;
2993
2994 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2995 if (skb == NULL)
2996 return -ENOMEM;
2997
2998 if (build_mapping(skb, x, ipaddr, sport) < 0)
2999 BUG();
3000
3001 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3002 }
3003
3004 static struct xfrm_mgr netlink_mgr = {
3005 .id = "netlink",
3006 .notify = xfrm_send_state_notify,
3007 .acquire = xfrm_send_acquire,
3008 .compile_policy = xfrm_compile_policy,
3009 .notify_policy = xfrm_send_policy_notify,
3010 .report = xfrm_send_report,
3011 .migrate = xfrm_send_migrate,
3012 .new_mapping = xfrm_send_mapping,
3013 };
3014
3015 static int __net_init xfrm_user_net_init(struct net *net)
3016 {
3017 struct sock *nlsk;
3018 struct netlink_kernel_cfg cfg = {
3019 .groups = XFRMNLGRP_MAX,
3020 .input = xfrm_netlink_rcv,
3021 };
3022
3023 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3024 if (nlsk == NULL)
3025 return -ENOMEM;
3026 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3027 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3028 return 0;
3029 }
3030
3031 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3032 {
3033 struct net *net;
3034 list_for_each_entry(net, net_exit_list, exit_list)
3035 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3036 synchronize_net();
3037 list_for_each_entry(net, net_exit_list, exit_list)
3038 netlink_kernel_release(net->xfrm.nlsk_stash);
3039 }
3040
3041 static struct pernet_operations xfrm_user_net_ops = {
3042 .init = xfrm_user_net_init,
3043 .exit_batch = xfrm_user_net_exit,
3044 };
3045
3046 static int __init xfrm_user_init(void)
3047 {
3048 int rv;
3049
3050 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3051
3052 rv = register_pernet_subsys(&xfrm_user_net_ops);
3053 if (rv < 0)
3054 return rv;
3055 rv = xfrm_register_km(&netlink_mgr);
3056 if (rv < 0)
3057 unregister_pernet_subsys(&xfrm_user_net_ops);
3058 return rv;
3059 }
3060
3061 static void __exit xfrm_user_exit(void)
3062 {
3063 xfrm_unregister_km(&netlink_mgr);
3064 unregister_pernet_subsys(&xfrm_user_net_ops);
3065 }
3066
3067 module_init(xfrm_user_init);
3068 module_exit(xfrm_user_exit);
3069 MODULE_LICENSE("GPL");
3070 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3071
Linux with added FPC-III support