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staging: zram: Add auto loading of module if user opens /dev/zram.
[linux-2.6/btrfs-unstable.git] / net / xfrm / xfrm_user.c
blob3f565e495ac68cea83e1d52cf7db7e820fe777ad
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 = p->replay_window;
450 x->props.reqid = p->reqid;
451 x->props.family = p->family;
452 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
453 x->props.flags = p->flags;
454
455 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
456 x->sel.family = p->family;
457 }
458
459 /*
460 * someday when pfkey also has support, we could have the code
461 * somehow made shareable and move it to xfrm_state.c - JHS
462 *
463 */
464 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
465 int update_esn)
466 {
467 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
468 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
469 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
470 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
471 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
472
473 if (re) {
474 struct xfrm_replay_state_esn *replay_esn;
475 replay_esn = nla_data(re);
476 memcpy(x->replay_esn, replay_esn,
477 xfrm_replay_state_esn_len(replay_esn));
478 memcpy(x->preplay_esn, replay_esn,
479 xfrm_replay_state_esn_len(replay_esn));
480 }
481
482 if (rp) {
483 struct xfrm_replay_state *replay;
484 replay = nla_data(rp);
485 memcpy(&x->replay, replay, sizeof(*replay));
486 memcpy(&x->preplay, replay, sizeof(*replay));
487 }
488
489 if (lt) {
490 struct xfrm_lifetime_cur *ltime;
491 ltime = nla_data(lt);
492 x->curlft.bytes = ltime->bytes;
493 x->curlft.packets = ltime->packets;
494 x->curlft.add_time = ltime->add_time;
495 x->curlft.use_time = ltime->use_time;
496 }
497
498 if (et)
499 x->replay_maxage = nla_get_u32(et);
500
501 if (rt)
502 x->replay_maxdiff = nla_get_u32(rt);
503 }
504
505 static struct xfrm_state *xfrm_state_construct(struct net *net,
506 struct xfrm_usersa_info *p,
507 struct nlattr **attrs,
508 int *errp)
509 {
510 struct xfrm_state *x = xfrm_state_alloc(net);
511 int err = -ENOMEM;
512
513 if (!x)
514 goto error_no_put;
515
516 copy_from_user_state(x, p);
517
518 if (attrs[XFRMA_SA_EXTRA_FLAGS])
519 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
520
521 if ((err = attach_aead(&x->aead, &x->props.ealgo,
522 attrs[XFRMA_ALG_AEAD])))
523 goto error;
524 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
525 attrs[XFRMA_ALG_AUTH_TRUNC])))
526 goto error;
527 if (!x->props.aalgo) {
528 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
529 attrs[XFRMA_ALG_AUTH])))
530 goto error;
531 }
532 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
533 xfrm_ealg_get_byname,
534 attrs[XFRMA_ALG_CRYPT])))
535 goto error;
536 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
537 xfrm_calg_get_byname,
538 attrs[XFRMA_ALG_COMP])))
539 goto error;
540
541 if (attrs[XFRMA_ENCAP]) {
542 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
543 sizeof(*x->encap), GFP_KERNEL);
544 if (x->encap == NULL)
545 goto error;
546 }
547
548 if (attrs[XFRMA_TFCPAD])
549 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
550
551 if (attrs[XFRMA_COADDR]) {
552 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
553 sizeof(*x->coaddr), GFP_KERNEL);
554 if (x->coaddr == NULL)
555 goto error;
556 }
557
558 xfrm_mark_get(attrs, &x->mark);
559
560 err = __xfrm_init_state(x, false);
561 if (err)
562 goto error;
563
564 if (attrs[XFRMA_SEC_CTX] &&
565 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
566 goto error;
567
568 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
569 attrs[XFRMA_REPLAY_ESN_VAL])))
570 goto error;
571
572 x->km.seq = p->seq;
573 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
574 /* sysctl_xfrm_aevent_etime is in 100ms units */
575 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
576
577 if ((err = xfrm_init_replay(x)))
578 goto error;
579
580 /* override default values from above */
581 xfrm_update_ae_params(x, attrs, 0);
582
583 return x;
584
585 error:
586 x->km.state = XFRM_STATE_DEAD;
587 xfrm_state_put(x);
588 error_no_put:
589 *errp = err;
590 return NULL;
591 }
592
593 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
594 struct nlattr **attrs)
595 {
596 struct net *net = sock_net(skb->sk);
597 struct xfrm_usersa_info *p = nlmsg_data(nlh);
598 struct xfrm_state *x;
599 int err;
600 struct km_event c;
601 kuid_t loginuid = audit_get_loginuid(current);
602 u32 sessionid = audit_get_sessionid(current);
603 u32 sid;
604
605 err = verify_newsa_info(p, attrs);
606 if (err)
607 return err;
608
609 x = xfrm_state_construct(net, p, attrs, &err);
610 if (!x)
611 return err;
612
613 xfrm_state_hold(x);
614 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
615 err = xfrm_state_add(x);
616 else
617 err = xfrm_state_update(x);
618
619 security_task_getsecid(current, &sid);
620 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
621
622 if (err < 0) {
623 x->km.state = XFRM_STATE_DEAD;
624 __xfrm_state_put(x);
625 goto out;
626 }
627
628 c.seq = nlh->nlmsg_seq;
629 c.portid = nlh->nlmsg_pid;
630 c.event = nlh->nlmsg_type;
631
632 km_state_notify(x, &c);
633 out:
634 xfrm_state_put(x);
635 return err;
636 }
637
638 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
639 struct xfrm_usersa_id *p,
640 struct nlattr **attrs,
641 int *errp)
642 {
643 struct xfrm_state *x = NULL;
644 struct xfrm_mark m;
645 int err;
646 u32 mark = xfrm_mark_get(attrs, &m);
647
648 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
649 err = -ESRCH;
650 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
651 } else {
652 xfrm_address_t *saddr = NULL;
653
654 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
655 if (!saddr) {
656 err = -EINVAL;
657 goto out;
658 }
659
660 err = -ESRCH;
661 x = xfrm_state_lookup_byaddr(net, mark,
662 &p->daddr, saddr,
663 p->proto, p->family);
664 }
665
666 out:
667 if (!x && errp)
668 *errp = err;
669 return x;
670 }
671
672 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
673 struct nlattr **attrs)
674 {
675 struct net *net = sock_net(skb->sk);
676 struct xfrm_state *x;
677 int err = -ESRCH;
678 struct km_event c;
679 struct xfrm_usersa_id *p = nlmsg_data(nlh);
680 kuid_t loginuid = audit_get_loginuid(current);
681 u32 sessionid = audit_get_sessionid(current);
682 u32 sid;
683
684 x = xfrm_user_state_lookup(net, p, attrs, &err);
685 if (x == NULL)
686 return err;
687
688 if ((err = security_xfrm_state_delete(x)) != 0)
689 goto out;
690
691 if (xfrm_state_kern(x)) {
692 err = -EPERM;
693 goto out;
694 }
695
696 err = xfrm_state_delete(x);
697
698 if (err < 0)
699 goto out;
700
701 c.seq = nlh->nlmsg_seq;
702 c.portid = nlh->nlmsg_pid;
703 c.event = nlh->nlmsg_type;
704 km_state_notify(x, &c);
705
706 out:
707 security_task_getsecid(current, &sid);
708 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
709 xfrm_state_put(x);
710 return err;
711 }
712
713 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
714 {
715 memset(p, 0, sizeof(*p));
716 memcpy(&p->id, &x->id, sizeof(p->id));
717 memcpy(&p->sel, &x->sel, sizeof(p->sel));
718 memcpy(&p->lft, &x->lft, sizeof(p->lft));
719 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
720 memcpy(&p->stats, &x->stats, sizeof(p->stats));
721 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
722 p->mode = x->props.mode;
723 p->replay_window = x->props.replay_window;
724 p->reqid = x->props.reqid;
725 p->family = x->props.family;
726 p->flags = x->props.flags;
727 p->seq = x->km.seq;
728 }
729
730 struct xfrm_dump_info {
731 struct sk_buff *in_skb;
732 struct sk_buff *out_skb;
733 u32 nlmsg_seq;
734 u16 nlmsg_flags;
735 };
736
737 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
738 {
739 struct xfrm_user_sec_ctx *uctx;
740 struct nlattr *attr;
741 int ctx_size = sizeof(*uctx) + s->ctx_len;
742
743 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
744 if (attr == NULL)
745 return -EMSGSIZE;
746
747 uctx = nla_data(attr);
748 uctx->exttype = XFRMA_SEC_CTX;
749 uctx->len = ctx_size;
750 uctx->ctx_doi = s->ctx_doi;
751 uctx->ctx_alg = s->ctx_alg;
752 uctx->ctx_len = s->ctx_len;
753 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
754
755 return 0;
756 }
757
758 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
759 {
760 struct xfrm_algo *algo;
761 struct nlattr *nla;
762
763 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
764 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
765 if (!nla)
766 return -EMSGSIZE;
767
768 algo = nla_data(nla);
769 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
770 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
771 algo->alg_key_len = auth->alg_key_len;
772
773 return 0;
774 }
775
776 /* Don't change this without updating xfrm_sa_len! */
777 static int copy_to_user_state_extra(struct xfrm_state *x,
778 struct xfrm_usersa_info *p,
779 struct sk_buff *skb)
780 {
781 int ret = 0;
782
783 copy_to_user_state(x, p);
784
785 if (x->props.extra_flags) {
786 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
787 x->props.extra_flags);
788 if (ret)
789 goto out;
790 }
791
792 if (x->coaddr) {
793 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
794 if (ret)
795 goto out;
796 }
797 if (x->lastused) {
798 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
799 if (ret)
800 goto out;
801 }
802 if (x->aead) {
803 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
804 if (ret)
805 goto out;
806 }
807 if (x->aalg) {
808 ret = copy_to_user_auth(x->aalg, skb);
809 if (!ret)
810 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
811 xfrm_alg_auth_len(x->aalg), x->aalg);
812 if (ret)
813 goto out;
814 }
815 if (x->ealg) {
816 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
817 if (ret)
818 goto out;
819 }
820 if (x->calg) {
821 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
822 if (ret)
823 goto out;
824 }
825 if (x->encap) {
826 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
827 if (ret)
828 goto out;
829 }
830 if (x->tfcpad) {
831 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
832 if (ret)
833 goto out;
834 }
835 ret = xfrm_mark_put(skb, &x->mark);
836 if (ret)
837 goto out;
838 if (x->replay_esn) {
839 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
840 xfrm_replay_state_esn_len(x->replay_esn),
841 x->replay_esn);
842 if (ret)
843 goto out;
844 }
845 if (x->security)
846 ret = copy_sec_ctx(x->security, skb);
847 out:
848 return ret;
849 }
850
851 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
852 {
853 struct xfrm_dump_info *sp = ptr;
854 struct sk_buff *in_skb = sp->in_skb;
855 struct sk_buff *skb = sp->out_skb;
856 struct xfrm_usersa_info *p;
857 struct nlmsghdr *nlh;
858 int err;
859
860 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
861 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
862 if (nlh == NULL)
863 return -EMSGSIZE;
864
865 p = nlmsg_data(nlh);
866
867 err = copy_to_user_state_extra(x, p, skb);
868 if (err) {
869 nlmsg_cancel(skb, nlh);
870 return err;
871 }
872 nlmsg_end(skb, nlh);
873 return 0;
874 }
875
876 static int xfrm_dump_sa_done(struct netlink_callback *cb)
877 {
878 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
879 xfrm_state_walk_done(walk);
880 return 0;
881 }
882
883 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
884 {
885 struct net *net = sock_net(skb->sk);
886 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
887 struct xfrm_dump_info info;
888
889 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
890 sizeof(cb->args) - sizeof(cb->args[0]));
891
892 info.in_skb = cb->skb;
893 info.out_skb = skb;
894 info.nlmsg_seq = cb->nlh->nlmsg_seq;
895 info.nlmsg_flags = NLM_F_MULTI;
896
897 if (!cb->args[0]) {
898 cb->args[0] = 1;
899 xfrm_state_walk_init(walk, 0);
900 }
901
902 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
903
904 return skb->len;
905 }
906
907 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
908 struct xfrm_state *x, u32 seq)
909 {
910 struct xfrm_dump_info info;
911 struct sk_buff *skb;
912 int err;
913
914 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
915 if (!skb)
916 return ERR_PTR(-ENOMEM);
917
918 info.in_skb = in_skb;
919 info.out_skb = skb;
920 info.nlmsg_seq = seq;
921 info.nlmsg_flags = 0;
922
923 err = dump_one_state(x, 0, &info);
924 if (err) {
925 kfree_skb(skb);
926 return ERR_PTR(err);
927 }
928
929 return skb;
930 }
931
932 static inline size_t xfrm_spdinfo_msgsize(void)
933 {
934 return NLMSG_ALIGN(4)
935 + nla_total_size(sizeof(struct xfrmu_spdinfo))
936 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
937 }
938
939 static int build_spdinfo(struct sk_buff *skb, struct net *net,
940 u32 portid, u32 seq, u32 flags)
941 {
942 struct xfrmk_spdinfo si;
943 struct xfrmu_spdinfo spc;
944 struct xfrmu_spdhinfo sph;
945 struct nlmsghdr *nlh;
946 int err;
947 u32 *f;
948
949 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
950 if (nlh == NULL) /* shouldn't really happen ... */
951 return -EMSGSIZE;
952
953 f = nlmsg_data(nlh);
954 *f = flags;
955 xfrm_spd_getinfo(net, &si);
956 spc.incnt = si.incnt;
957 spc.outcnt = si.outcnt;
958 spc.fwdcnt = si.fwdcnt;
959 spc.inscnt = si.inscnt;
960 spc.outscnt = si.outscnt;
961 spc.fwdscnt = si.fwdscnt;
962 sph.spdhcnt = si.spdhcnt;
963 sph.spdhmcnt = si.spdhmcnt;
964
965 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
966 if (!err)
967 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
968 if (err) {
969 nlmsg_cancel(skb, nlh);
970 return err;
971 }
972
973 return nlmsg_end(skb, nlh);
974 }
975
976 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
977 struct nlattr **attrs)
978 {
979 struct net *net = sock_net(skb->sk);
980 struct sk_buff *r_skb;
981 u32 *flags = nlmsg_data(nlh);
982 u32 sportid = NETLINK_CB(skb).portid;
983 u32 seq = nlh->nlmsg_seq;
984
985 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
986 if (r_skb == NULL)
987 return -ENOMEM;
988
989 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
990 BUG();
991
992 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
993 }
994
995 static inline size_t xfrm_sadinfo_msgsize(void)
996 {
997 return NLMSG_ALIGN(4)
998 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
999 + nla_total_size(4); /* XFRMA_SAD_CNT */
1000 }
1001
1002 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1003 u32 portid, u32 seq, u32 flags)
1004 {
1005 struct xfrmk_sadinfo si;
1006 struct xfrmu_sadhinfo sh;
1007 struct nlmsghdr *nlh;
1008 int err;
1009 u32 *f;
1010
1011 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1012 if (nlh == NULL) /* shouldn't really happen ... */
1013 return -EMSGSIZE;
1014
1015 f = nlmsg_data(nlh);
1016 *f = flags;
1017 xfrm_sad_getinfo(net, &si);
1018
1019 sh.sadhmcnt = si.sadhmcnt;
1020 sh.sadhcnt = si.sadhcnt;
1021
1022 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1023 if (!err)
1024 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1025 if (err) {
1026 nlmsg_cancel(skb, nlh);
1027 return err;
1028 }
1029
1030 return nlmsg_end(skb, nlh);
1031 }
1032
1033 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1034 struct nlattr **attrs)
1035 {
1036 struct net *net = sock_net(skb->sk);
1037 struct sk_buff *r_skb;
1038 u32 *flags = nlmsg_data(nlh);
1039 u32 sportid = NETLINK_CB(skb).portid;
1040 u32 seq = nlh->nlmsg_seq;
1041
1042 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1043 if (r_skb == NULL)
1044 return -ENOMEM;
1045
1046 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1047 BUG();
1048
1049 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1050 }
1051
1052 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1053 struct nlattr **attrs)
1054 {
1055 struct net *net = sock_net(skb->sk);
1056 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1057 struct xfrm_state *x;
1058 struct sk_buff *resp_skb;
1059 int err = -ESRCH;
1060
1061 x = xfrm_user_state_lookup(net, p, attrs, &err);
1062 if (x == NULL)
1063 goto out_noput;
1064
1065 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1066 if (IS_ERR(resp_skb)) {
1067 err = PTR_ERR(resp_skb);
1068 } else {
1069 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1070 }
1071 xfrm_state_put(x);
1072 out_noput:
1073 return err;
1074 }
1075
1076 static int verify_userspi_info(struct xfrm_userspi_info *p)
1077 {
1078 switch (p->info.id.proto) {
1079 case IPPROTO_AH:
1080 case IPPROTO_ESP:
1081 break;
1082
1083 case IPPROTO_COMP:
1084 /* IPCOMP spi is 16-bits. */
1085 if (p->max >= 0x10000)
1086 return -EINVAL;
1087 break;
1088
1089 default:
1090 return -EINVAL;
1091 }
1092
1093 if (p->min > p->max)
1094 return -EINVAL;
1095
1096 return 0;
1097 }
1098
1099 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1100 struct nlattr **attrs)
1101 {
1102 struct net *net = sock_net(skb->sk);
1103 struct xfrm_state *x;
1104 struct xfrm_userspi_info *p;
1105 struct sk_buff *resp_skb;
1106 xfrm_address_t *daddr;
1107 int family;
1108 int err;
1109 u32 mark;
1110 struct xfrm_mark m;
1111
1112 p = nlmsg_data(nlh);
1113 err = verify_userspi_info(p);
1114 if (err)
1115 goto out_noput;
1116
1117 family = p->info.family;
1118 daddr = &p->info.id.daddr;
1119
1120 x = NULL;
1121
1122 mark = xfrm_mark_get(attrs, &m);
1123 if (p->info.seq) {
1124 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1125 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1126 xfrm_state_put(x);
1127 x = NULL;
1128 }
1129 }
1130
1131 if (!x)
1132 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1133 p->info.id.proto, daddr,
1134 &p->info.saddr, 1,
1135 family);
1136 err = -ENOENT;
1137 if (x == NULL)
1138 goto out_noput;
1139
1140 err = xfrm_alloc_spi(x, p->min, p->max);
1141 if (err)
1142 goto out;
1143
1144 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1145 if (IS_ERR(resp_skb)) {
1146 err = PTR_ERR(resp_skb);
1147 goto out;
1148 }
1149
1150 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1151
1152 out:
1153 xfrm_state_put(x);
1154 out_noput:
1155 return err;
1156 }
1157
1158 static int verify_policy_dir(u8 dir)
1159 {
1160 switch (dir) {
1161 case XFRM_POLICY_IN:
1162 case XFRM_POLICY_OUT:
1163 case XFRM_POLICY_FWD:
1164 break;
1165
1166 default:
1167 return -EINVAL;
1168 }
1169
1170 return 0;
1171 }
1172
1173 static int verify_policy_type(u8 type)
1174 {
1175 switch (type) {
1176 case XFRM_POLICY_TYPE_MAIN:
1177 #ifdef CONFIG_XFRM_SUB_POLICY
1178 case XFRM_POLICY_TYPE_SUB:
1179 #endif
1180 break;
1181
1182 default:
1183 return -EINVAL;
1184 }
1185
1186 return 0;
1187 }
1188
1189 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1190 {
1191 switch (p->share) {
1192 case XFRM_SHARE_ANY:
1193 case XFRM_SHARE_SESSION:
1194 case XFRM_SHARE_USER:
1195 case XFRM_SHARE_UNIQUE:
1196 break;
1197
1198 default:
1199 return -EINVAL;
1200 }
1201
1202 switch (p->action) {
1203 case XFRM_POLICY_ALLOW:
1204 case XFRM_POLICY_BLOCK:
1205 break;
1206
1207 default:
1208 return -EINVAL;
1209 }
1210
1211 switch (p->sel.family) {
1212 case AF_INET:
1213 break;
1214
1215 case AF_INET6:
1216 #if IS_ENABLED(CONFIG_IPV6)
1217 break;
1218 #else
1219 return -EAFNOSUPPORT;
1220 #endif
1221
1222 default:
1223 return -EINVAL;
1224 }
1225
1226 return verify_policy_dir(p->dir);
1227 }
1228
1229 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1230 {
1231 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1232 struct xfrm_user_sec_ctx *uctx;
1233
1234 if (!rt)
1235 return 0;
1236
1237 uctx = nla_data(rt);
1238 return security_xfrm_policy_alloc(&pol->security, uctx);
1239 }
1240
1241 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1242 int nr)
1243 {
1244 int i;
1245
1246 xp->xfrm_nr = nr;
1247 for (i = 0; i < nr; i++, ut++) {
1248 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1249
1250 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1251 memcpy(&t->saddr, &ut->saddr,
1252 sizeof(xfrm_address_t));
1253 t->reqid = ut->reqid;
1254 t->mode = ut->mode;
1255 t->share = ut->share;
1256 t->optional = ut->optional;
1257 t->aalgos = ut->aalgos;
1258 t->ealgos = ut->ealgos;
1259 t->calgos = ut->calgos;
1260 /* If all masks are ~0, then we allow all algorithms. */
1261 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1262 t->encap_family = ut->family;
1263 }
1264 }
1265
1266 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1267 {
1268 int i;
1269
1270 if (nr > XFRM_MAX_DEPTH)
1271 return -EINVAL;
1272
1273 for (i = 0; i < nr; i++) {
1274 /* We never validated the ut->family value, so many
1275 * applications simply leave it at zero. The check was
1276 * never made and ut->family was ignored because all
1277 * templates could be assumed to have the same family as
1278 * the policy itself. Now that we will have ipv4-in-ipv6
1279 * and ipv6-in-ipv4 tunnels, this is no longer true.
1280 */
1281 if (!ut[i].family)
1282 ut[i].family = family;
1283
1284 switch (ut[i].family) {
1285 case AF_INET:
1286 break;
1287 #if IS_ENABLED(CONFIG_IPV6)
1288 case AF_INET6:
1289 break;
1290 #endif
1291 default:
1292 return -EINVAL;
1293 }
1294 }
1295
1296 return 0;
1297 }
1298
1299 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1300 {
1301 struct nlattr *rt = attrs[XFRMA_TMPL];
1302
1303 if (!rt) {
1304 pol->xfrm_nr = 0;
1305 } else {
1306 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1307 int nr = nla_len(rt) / sizeof(*utmpl);
1308 int err;
1309
1310 err = validate_tmpl(nr, utmpl, pol->family);
1311 if (err)
1312 return err;
1313
1314 copy_templates(pol, utmpl, nr);
1315 }
1316 return 0;
1317 }
1318
1319 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1320 {
1321 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1322 struct xfrm_userpolicy_type *upt;
1323 u8 type = XFRM_POLICY_TYPE_MAIN;
1324 int err;
1325
1326 if (rt) {
1327 upt = nla_data(rt);
1328 type = upt->type;
1329 }
1330
1331 err = verify_policy_type(type);
1332 if (err)
1333 return err;
1334
1335 *tp = type;
1336 return 0;
1337 }
1338
1339 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1340 {
1341 xp->priority = p->priority;
1342 xp->index = p->index;
1343 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1344 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1345 xp->action = p->action;
1346 xp->flags = p->flags;
1347 xp->family = p->sel.family;
1348 /* XXX xp->share = p->share; */
1349 }
1350
1351 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1352 {
1353 memset(p, 0, sizeof(*p));
1354 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1355 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1356 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1357 p->priority = xp->priority;
1358 p->index = xp->index;
1359 p->sel.family = xp->family;
1360 p->dir = dir;
1361 p->action = xp->action;
1362 p->flags = xp->flags;
1363 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1364 }
1365
1366 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1367 {
1368 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1369 int err;
1370
1371 if (!xp) {
1372 *errp = -ENOMEM;
1373 return NULL;
1374 }
1375
1376 copy_from_user_policy(xp, p);
1377
1378 err = copy_from_user_policy_type(&xp->type, attrs);
1379 if (err)
1380 goto error;
1381
1382 if (!(err = copy_from_user_tmpl(xp, attrs)))
1383 err = copy_from_user_sec_ctx(xp, attrs);
1384 if (err)
1385 goto error;
1386
1387 xfrm_mark_get(attrs, &xp->mark);
1388
1389 return xp;
1390 error:
1391 *errp = err;
1392 xp->walk.dead = 1;
1393 xfrm_policy_destroy(xp);
1394 return NULL;
1395 }
1396
1397 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1398 struct nlattr **attrs)
1399 {
1400 struct net *net = sock_net(skb->sk);
1401 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1402 struct xfrm_policy *xp;
1403 struct km_event c;
1404 int err;
1405 int excl;
1406 kuid_t loginuid = audit_get_loginuid(current);
1407 u32 sessionid = audit_get_sessionid(current);
1408 u32 sid;
1409
1410 err = verify_newpolicy_info(p);
1411 if (err)
1412 return err;
1413 err = verify_sec_ctx_len(attrs);
1414 if (err)
1415 return err;
1416
1417 xp = xfrm_policy_construct(net, p, attrs, &err);
1418 if (!xp)
1419 return err;
1420
1421 /* shouldn't excl be based on nlh flags??
1422 * Aha! this is anti-netlink really i.e more pfkey derived
1423 * in netlink excl is a flag and you wouldnt need
1424 * a type XFRM_MSG_UPDPOLICY - JHS */
1425 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1426 err = xfrm_policy_insert(p->dir, xp, excl);
1427 security_task_getsecid(current, &sid);
1428 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1429
1430 if (err) {
1431 security_xfrm_policy_free(xp->security);
1432 kfree(xp);
1433 return err;
1434 }
1435
1436 c.event = nlh->nlmsg_type;
1437 c.seq = nlh->nlmsg_seq;
1438 c.portid = nlh->nlmsg_pid;
1439 km_policy_notify(xp, p->dir, &c);
1440
1441 xfrm_pol_put(xp);
1442
1443 return 0;
1444 }
1445
1446 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1447 {
1448 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1449 int i;
1450
1451 if (xp->xfrm_nr == 0)
1452 return 0;
1453
1454 for (i = 0; i < xp->xfrm_nr; i++) {
1455 struct xfrm_user_tmpl *up = &vec[i];
1456 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1457
1458 memset(up, 0, sizeof(*up));
1459 memcpy(&up->id, &kp->id, sizeof(up->id));
1460 up->family = kp->encap_family;
1461 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1462 up->reqid = kp->reqid;
1463 up->mode = kp->mode;
1464 up->share = kp->share;
1465 up->optional = kp->optional;
1466 up->aalgos = kp->aalgos;
1467 up->ealgos = kp->ealgos;
1468 up->calgos = kp->calgos;
1469 }
1470
1471 return nla_put(skb, XFRMA_TMPL,
1472 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1473 }
1474
1475 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1476 {
1477 if (x->security) {
1478 return copy_sec_ctx(x->security, skb);
1479 }
1480 return 0;
1481 }
1482
1483 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1484 {
1485 if (xp->security)
1486 return copy_sec_ctx(xp->security, skb);
1487 return 0;
1488 }
1489 static inline size_t userpolicy_type_attrsize(void)
1490 {
1491 #ifdef CONFIG_XFRM_SUB_POLICY
1492 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1493 #else
1494 return 0;
1495 #endif
1496 }
1497
1498 #ifdef CONFIG_XFRM_SUB_POLICY
1499 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1500 {
1501 struct xfrm_userpolicy_type upt = {
1502 .type = type,
1503 };
1504
1505 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1506 }
1507
1508 #else
1509 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1510 {
1511 return 0;
1512 }
1513 #endif
1514
1515 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1516 {
1517 struct xfrm_dump_info *sp = ptr;
1518 struct xfrm_userpolicy_info *p;
1519 struct sk_buff *in_skb = sp->in_skb;
1520 struct sk_buff *skb = sp->out_skb;
1521 struct nlmsghdr *nlh;
1522 int err;
1523
1524 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1525 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1526 if (nlh == NULL)
1527 return -EMSGSIZE;
1528
1529 p = nlmsg_data(nlh);
1530 copy_to_user_policy(xp, p, dir);
1531 err = copy_to_user_tmpl(xp, skb);
1532 if (!err)
1533 err = copy_to_user_sec_ctx(xp, skb);
1534 if (!err)
1535 err = copy_to_user_policy_type(xp->type, skb);
1536 if (!err)
1537 err = xfrm_mark_put(skb, &xp->mark);
1538 if (err) {
1539 nlmsg_cancel(skb, nlh);
1540 return err;
1541 }
1542 nlmsg_end(skb, nlh);
1543 return 0;
1544 }
1545
1546 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1547 {
1548 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1549
1550 xfrm_policy_walk_done(walk);
1551 return 0;
1552 }
1553
1554 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1555 {
1556 struct net *net = sock_net(skb->sk);
1557 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1558 struct xfrm_dump_info info;
1559
1560 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1561 sizeof(cb->args) - sizeof(cb->args[0]));
1562
1563 info.in_skb = cb->skb;
1564 info.out_skb = skb;
1565 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1566 info.nlmsg_flags = NLM_F_MULTI;
1567
1568 if (!cb->args[0]) {
1569 cb->args[0] = 1;
1570 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1571 }
1572
1573 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1574
1575 return skb->len;
1576 }
1577
1578 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1579 struct xfrm_policy *xp,
1580 int dir, u32 seq)
1581 {
1582 struct xfrm_dump_info info;
1583 struct sk_buff *skb;
1584 int err;
1585
1586 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1587 if (!skb)
1588 return ERR_PTR(-ENOMEM);
1589
1590 info.in_skb = in_skb;
1591 info.out_skb = skb;
1592 info.nlmsg_seq = seq;
1593 info.nlmsg_flags = 0;
1594
1595 err = dump_one_policy(xp, dir, 0, &info);
1596 if (err) {
1597 kfree_skb(skb);
1598 return ERR_PTR(err);
1599 }
1600
1601 return skb;
1602 }
1603
1604 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1605 struct nlattr **attrs)
1606 {
1607 struct net *net = sock_net(skb->sk);
1608 struct xfrm_policy *xp;
1609 struct xfrm_userpolicy_id *p;
1610 u8 type = XFRM_POLICY_TYPE_MAIN;
1611 int err;
1612 struct km_event c;
1613 int delete;
1614 struct xfrm_mark m;
1615 u32 mark = xfrm_mark_get(attrs, &m);
1616
1617 p = nlmsg_data(nlh);
1618 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1619
1620 err = copy_from_user_policy_type(&type, attrs);
1621 if (err)
1622 return err;
1623
1624 err = verify_policy_dir(p->dir);
1625 if (err)
1626 return err;
1627
1628 if (p->index)
1629 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1630 else {
1631 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1632 struct xfrm_sec_ctx *ctx;
1633
1634 err = verify_sec_ctx_len(attrs);
1635 if (err)
1636 return err;
1637
1638 ctx = NULL;
1639 if (rt) {
1640 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1641
1642 err = security_xfrm_policy_alloc(&ctx, uctx);
1643 if (err)
1644 return err;
1645 }
1646 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1647 ctx, delete, &err);
1648 security_xfrm_policy_free(ctx);
1649 }
1650 if (xp == NULL)
1651 return -ENOENT;
1652
1653 if (!delete) {
1654 struct sk_buff *resp_skb;
1655
1656 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1657 if (IS_ERR(resp_skb)) {
1658 err = PTR_ERR(resp_skb);
1659 } else {
1660 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1661 NETLINK_CB(skb).portid);
1662 }
1663 } else {
1664 kuid_t loginuid = audit_get_loginuid(current);
1665 u32 sessionid = audit_get_sessionid(current);
1666 u32 sid;
1667
1668 security_task_getsecid(current, &sid);
1669 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1670 sid);
1671
1672 if (err != 0)
1673 goto out;
1674
1675 c.data.byid = p->index;
1676 c.event = nlh->nlmsg_type;
1677 c.seq = nlh->nlmsg_seq;
1678 c.portid = nlh->nlmsg_pid;
1679 km_policy_notify(xp, p->dir, &c);
1680 }
1681
1682 out:
1683 xfrm_pol_put(xp);
1684 if (delete && err == 0)
1685 xfrm_garbage_collect(net);
1686 return err;
1687 }
1688
1689 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1690 struct nlattr **attrs)
1691 {
1692 struct net *net = sock_net(skb->sk);
1693 struct km_event c;
1694 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1695 struct xfrm_audit audit_info;
1696 int err;
1697
1698 audit_info.loginuid = audit_get_loginuid(current);
1699 audit_info.sessionid = audit_get_sessionid(current);
1700 security_task_getsecid(current, &audit_info.secid);
1701 err = xfrm_state_flush(net, p->proto, &audit_info);
1702 if (err) {
1703 if (err == -ESRCH) /* empty table */
1704 return 0;
1705 return err;
1706 }
1707 c.data.proto = p->proto;
1708 c.event = nlh->nlmsg_type;
1709 c.seq = nlh->nlmsg_seq;
1710 c.portid = nlh->nlmsg_pid;
1711 c.net = net;
1712 km_state_notify(NULL, &c);
1713
1714 return 0;
1715 }
1716
1717 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1718 {
1719 size_t replay_size = x->replay_esn ?
1720 xfrm_replay_state_esn_len(x->replay_esn) :
1721 sizeof(struct xfrm_replay_state);
1722
1723 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1724 + nla_total_size(replay_size)
1725 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1726 + nla_total_size(sizeof(struct xfrm_mark))
1727 + nla_total_size(4) /* XFRM_AE_RTHR */
1728 + nla_total_size(4); /* XFRM_AE_ETHR */
1729 }
1730
1731 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1732 {
1733 struct xfrm_aevent_id *id;
1734 struct nlmsghdr *nlh;
1735 int err;
1736
1737 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1738 if (nlh == NULL)
1739 return -EMSGSIZE;
1740
1741 id = nlmsg_data(nlh);
1742 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1743 id->sa_id.spi = x->id.spi;
1744 id->sa_id.family = x->props.family;
1745 id->sa_id.proto = x->id.proto;
1746 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1747 id->reqid = x->props.reqid;
1748 id->flags = c->data.aevent;
1749
1750 if (x->replay_esn) {
1751 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1752 xfrm_replay_state_esn_len(x->replay_esn),
1753 x->replay_esn);
1754 } else {
1755 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1756 &x->replay);
1757 }
1758 if (err)
1759 goto out_cancel;
1760 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1761 if (err)
1762 goto out_cancel;
1763
1764 if (id->flags & XFRM_AE_RTHR) {
1765 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1766 if (err)
1767 goto out_cancel;
1768 }
1769 if (id->flags & XFRM_AE_ETHR) {
1770 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1771 x->replay_maxage * 10 / HZ);
1772 if (err)
1773 goto out_cancel;
1774 }
1775 err = xfrm_mark_put(skb, &x->mark);
1776 if (err)
1777 goto out_cancel;
1778
1779 return nlmsg_end(skb, nlh);
1780
1781 out_cancel:
1782 nlmsg_cancel(skb, nlh);
1783 return err;
1784 }
1785
1786 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1787 struct nlattr **attrs)
1788 {
1789 struct net *net = sock_net(skb->sk);
1790 struct xfrm_state *x;
1791 struct sk_buff *r_skb;
1792 int err;
1793 struct km_event c;
1794 u32 mark;
1795 struct xfrm_mark m;
1796 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1797 struct xfrm_usersa_id *id = &p->sa_id;
1798
1799 mark = xfrm_mark_get(attrs, &m);
1800
1801 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1802 if (x == NULL)
1803 return -ESRCH;
1804
1805 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1806 if (r_skb == NULL) {
1807 xfrm_state_put(x);
1808 return -ENOMEM;
1809 }
1810
1811 /*
1812 * XXX: is this lock really needed - none of the other
1813 * gets lock (the concern is things getting updated
1814 * while we are still reading) - jhs
1815 */
1816 spin_lock_bh(&x->lock);
1817 c.data.aevent = p->flags;
1818 c.seq = nlh->nlmsg_seq;
1819 c.portid = nlh->nlmsg_pid;
1820
1821 if (build_aevent(r_skb, x, &c) < 0)
1822 BUG();
1823 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1824 spin_unlock_bh(&x->lock);
1825 xfrm_state_put(x);
1826 return err;
1827 }
1828
1829 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 struct nlattr **attrs)
1831 {
1832 struct net *net = sock_net(skb->sk);
1833 struct xfrm_state *x;
1834 struct km_event c;
1835 int err = - EINVAL;
1836 u32 mark = 0;
1837 struct xfrm_mark m;
1838 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1839 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1840 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1841 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1842
1843 if (!lt && !rp && !re)
1844 return err;
1845
1846 /* pedantic mode - thou shalt sayeth replaceth */
1847 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1848 return err;
1849
1850 mark = xfrm_mark_get(attrs, &m);
1851
1852 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1853 if (x == NULL)
1854 return -ESRCH;
1855
1856 if (x->km.state != XFRM_STATE_VALID)
1857 goto out;
1858
1859 err = xfrm_replay_verify_len(x->replay_esn, rp);
1860 if (err)
1861 goto out;
1862
1863 spin_lock_bh(&x->lock);
1864 xfrm_update_ae_params(x, attrs, 1);
1865 spin_unlock_bh(&x->lock);
1866
1867 c.event = nlh->nlmsg_type;
1868 c.seq = nlh->nlmsg_seq;
1869 c.portid = nlh->nlmsg_pid;
1870 c.data.aevent = XFRM_AE_CU;
1871 km_state_notify(x, &c);
1872 err = 0;
1873 out:
1874 xfrm_state_put(x);
1875 return err;
1876 }
1877
1878 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1879 struct nlattr **attrs)
1880 {
1881 struct net *net = sock_net(skb->sk);
1882 struct km_event c;
1883 u8 type = XFRM_POLICY_TYPE_MAIN;
1884 int err;
1885 struct xfrm_audit audit_info;
1886
1887 err = copy_from_user_policy_type(&type, attrs);
1888 if (err)
1889 return err;
1890
1891 audit_info.loginuid = audit_get_loginuid(current);
1892 audit_info.sessionid = audit_get_sessionid(current);
1893 security_task_getsecid(current, &audit_info.secid);
1894 err = xfrm_policy_flush(net, type, &audit_info);
1895 if (err) {
1896 if (err == -ESRCH) /* empty table */
1897 return 0;
1898 return err;
1899 }
1900
1901 c.data.type = type;
1902 c.event = nlh->nlmsg_type;
1903 c.seq = nlh->nlmsg_seq;
1904 c.portid = nlh->nlmsg_pid;
1905 c.net = net;
1906 km_policy_notify(NULL, 0, &c);
1907 return 0;
1908 }
1909
1910 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1911 struct nlattr **attrs)
1912 {
1913 struct net *net = sock_net(skb->sk);
1914 struct xfrm_policy *xp;
1915 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1916 struct xfrm_userpolicy_info *p = &up->pol;
1917 u8 type = XFRM_POLICY_TYPE_MAIN;
1918 int err = -ENOENT;
1919 struct xfrm_mark m;
1920 u32 mark = xfrm_mark_get(attrs, &m);
1921
1922 err = copy_from_user_policy_type(&type, attrs);
1923 if (err)
1924 return err;
1925
1926 err = verify_policy_dir(p->dir);
1927 if (err)
1928 return err;
1929
1930 if (p->index)
1931 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1932 else {
1933 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1934 struct xfrm_sec_ctx *ctx;
1935
1936 err = verify_sec_ctx_len(attrs);
1937 if (err)
1938 return err;
1939
1940 ctx = NULL;
1941 if (rt) {
1942 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1943
1944 err = security_xfrm_policy_alloc(&ctx, uctx);
1945 if (err)
1946 return err;
1947 }
1948 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1949 &p->sel, ctx, 0, &err);
1950 security_xfrm_policy_free(ctx);
1951 }
1952 if (xp == NULL)
1953 return -ENOENT;
1954
1955 if (unlikely(xp->walk.dead))
1956 goto out;
1957
1958 err = 0;
1959 if (up->hard) {
1960 kuid_t loginuid = audit_get_loginuid(current);
1961 u32 sessionid = audit_get_sessionid(current);
1962 u32 sid;
1963
1964 security_task_getsecid(current, &sid);
1965 xfrm_policy_delete(xp, p->dir);
1966 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1967
1968 } else {
1969 // reset the timers here?
1970 WARN(1, "Dont know what to do with soft policy expire\n");
1971 }
1972 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1973
1974 out:
1975 xfrm_pol_put(xp);
1976 return err;
1977 }
1978
1979 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1980 struct nlattr **attrs)
1981 {
1982 struct net *net = sock_net(skb->sk);
1983 struct xfrm_state *x;
1984 int err;
1985 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1986 struct xfrm_usersa_info *p = &ue->state;
1987 struct xfrm_mark m;
1988 u32 mark = xfrm_mark_get(attrs, &m);
1989
1990 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1991
1992 err = -ENOENT;
1993 if (x == NULL)
1994 return err;
1995
1996 spin_lock_bh(&x->lock);
1997 err = -EINVAL;
1998 if (x->km.state != XFRM_STATE_VALID)
1999 goto out;
2000 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2001
2002 if (ue->hard) {
2003 kuid_t loginuid = audit_get_loginuid(current);
2004 u32 sessionid = audit_get_sessionid(current);
2005 u32 sid;
2006
2007 security_task_getsecid(current, &sid);
2008 __xfrm_state_delete(x);
2009 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
2010 }
2011 err = 0;
2012 out:
2013 spin_unlock_bh(&x->lock);
2014 xfrm_state_put(x);
2015 return err;
2016 }
2017
2018 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2019 struct nlattr **attrs)
2020 {
2021 struct net *net = sock_net(skb->sk);
2022 struct xfrm_policy *xp;
2023 struct xfrm_user_tmpl *ut;
2024 int i;
2025 struct nlattr *rt = attrs[XFRMA_TMPL];
2026 struct xfrm_mark mark;
2027
2028 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2029 struct xfrm_state *x = xfrm_state_alloc(net);
2030 int err = -ENOMEM;
2031
2032 if (!x)
2033 goto nomem;
2034
2035 xfrm_mark_get(attrs, &mark);
2036
2037 err = verify_newpolicy_info(&ua->policy);
2038 if (err)
2039 goto bad_policy;
2040
2041 /* build an XP */
2042 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2043 if (!xp)
2044 goto free_state;
2045
2046 memcpy(&x->id, &ua->id, sizeof(ua->id));
2047 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2048 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2049 xp->mark.m = x->mark.m = mark.m;
2050 xp->mark.v = x->mark.v = mark.v;
2051 ut = nla_data(rt);
2052 /* extract the templates and for each call km_key */
2053 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2054 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2055 memcpy(&x->id, &t->id, sizeof(x->id));
2056 x->props.mode = t->mode;
2057 x->props.reqid = t->reqid;
2058 x->props.family = ut->family;
2059 t->aalgos = ua->aalgos;
2060 t->ealgos = ua->ealgos;
2061 t->calgos = ua->calgos;
2062 err = km_query(x, t, xp);
2063
2064 }
2065
2066 kfree(x);
2067 kfree(xp);
2068
2069 return 0;
2070
2071 bad_policy:
2072 WARN(1, "BAD policy passed\n");
2073 free_state:
2074 kfree(x);
2075 nomem:
2076 return err;
2077 }
2078
2079 #ifdef CONFIG_XFRM_MIGRATE
2080 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2081 struct xfrm_kmaddress *k,
2082 struct nlattr **attrs, int *num)
2083 {
2084 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2085 struct xfrm_user_migrate *um;
2086 int i, num_migrate;
2087
2088 if (k != NULL) {
2089 struct xfrm_user_kmaddress *uk;
2090
2091 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2092 memcpy(&k->local, &uk->local, sizeof(k->local));
2093 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2094 k->family = uk->family;
2095 k->reserved = uk->reserved;
2096 }
2097
2098 um = nla_data(rt);
2099 num_migrate = nla_len(rt) / sizeof(*um);
2100
2101 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2102 return -EINVAL;
2103
2104 for (i = 0; i < num_migrate; i++, um++, ma++) {
2105 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2106 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2107 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2108 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2109
2110 ma->proto = um->proto;
2111 ma->mode = um->mode;
2112 ma->reqid = um->reqid;
2113
2114 ma->old_family = um->old_family;
2115 ma->new_family = um->new_family;
2116 }
2117
2118 *num = i;
2119 return 0;
2120 }
2121
2122 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2123 struct nlattr **attrs)
2124 {
2125 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2126 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2127 struct xfrm_kmaddress km, *kmp;
2128 u8 type;
2129 int err;
2130 int n = 0;
2131
2132 if (attrs[XFRMA_MIGRATE] == NULL)
2133 return -EINVAL;
2134
2135 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2136
2137 err = copy_from_user_policy_type(&type, attrs);
2138 if (err)
2139 return err;
2140
2141 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2142 if (err)
2143 return err;
2144
2145 if (!n)
2146 return 0;
2147
2148 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2149
2150 return 0;
2151 }
2152 #else
2153 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2154 struct nlattr **attrs)
2155 {
2156 return -ENOPROTOOPT;
2157 }
2158 #endif
2159
2160 #ifdef CONFIG_XFRM_MIGRATE
2161 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2162 {
2163 struct xfrm_user_migrate um;
2164
2165 memset(&um, 0, sizeof(um));
2166 um.proto = m->proto;
2167 um.mode = m->mode;
2168 um.reqid = m->reqid;
2169 um.old_family = m->old_family;
2170 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2171 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2172 um.new_family = m->new_family;
2173 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2174 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2175
2176 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2177 }
2178
2179 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2180 {
2181 struct xfrm_user_kmaddress uk;
2182
2183 memset(&uk, 0, sizeof(uk));
2184 uk.family = k->family;
2185 uk.reserved = k->reserved;
2186 memcpy(&uk.local, &k->local, sizeof(uk.local));
2187 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2188
2189 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2190 }
2191
2192 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2193 {
2194 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2195 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2196 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2197 + userpolicy_type_attrsize();
2198 }
2199
2200 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2201 int num_migrate, const struct xfrm_kmaddress *k,
2202 const struct xfrm_selector *sel, u8 dir, u8 type)
2203 {
2204 const struct xfrm_migrate *mp;
2205 struct xfrm_userpolicy_id *pol_id;
2206 struct nlmsghdr *nlh;
2207 int i, err;
2208
2209 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2210 if (nlh == NULL)
2211 return -EMSGSIZE;
2212
2213 pol_id = nlmsg_data(nlh);
2214 /* copy data from selector, dir, and type to the pol_id */
2215 memset(pol_id, 0, sizeof(*pol_id));
2216 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2217 pol_id->dir = dir;
2218
2219 if (k != NULL) {
2220 err = copy_to_user_kmaddress(k, skb);
2221 if (err)
2222 goto out_cancel;
2223 }
2224 err = copy_to_user_policy_type(type, skb);
2225 if (err)
2226 goto out_cancel;
2227 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2228 err = copy_to_user_migrate(mp, skb);
2229 if (err)
2230 goto out_cancel;
2231 }
2232
2233 return nlmsg_end(skb, nlh);
2234
2235 out_cancel:
2236 nlmsg_cancel(skb, nlh);
2237 return err;
2238 }
2239
2240 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2241 const struct xfrm_migrate *m, int num_migrate,
2242 const struct xfrm_kmaddress *k)
2243 {
2244 struct net *net = &init_net;
2245 struct sk_buff *skb;
2246
2247 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2248 if (skb == NULL)
2249 return -ENOMEM;
2250
2251 /* build migrate */
2252 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2253 BUG();
2254
2255 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2256 }
2257 #else
2258 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2259 const struct xfrm_migrate *m, int num_migrate,
2260 const struct xfrm_kmaddress *k)
2261 {
2262 return -ENOPROTOOPT;
2263 }
2264 #endif
2265
2266 #define XMSGSIZE(type) sizeof(struct type)
2267
2268 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2269 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2270 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2271 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2272 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2273 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2274 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2275 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2276 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2277 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2278 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2279 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2280 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2281 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2282 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2283 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2284 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2285 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2286 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2287 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2288 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2289 };
2290
2291 #undef XMSGSIZE
2292
2293 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2294 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2295 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2296 [XFRMA_LASTUSED] = { .type = NLA_U64},
2297 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2298 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2299 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2300 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2301 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2302 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2303 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2304 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2305 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2306 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2307 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2308 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2309 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2310 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2311 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2312 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2313 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2314 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2315 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2316 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2317 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2318 };
2319
2320 static const struct xfrm_link {
2321 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2322 int (*dump)(struct sk_buff *, struct netlink_callback *);
2323 int (*done)(struct netlink_callback *);
2324 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2325 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2326 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2327 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2328 .dump = xfrm_dump_sa,
2329 .done = xfrm_dump_sa_done },
2330 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2331 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2332 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2333 .dump = xfrm_dump_policy,
2334 .done = xfrm_dump_policy_done },
2335 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2336 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2337 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2338 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2339 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2340 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2341 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2342 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2343 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2344 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2345 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2346 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2347 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2348 };
2349
2350 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2351 {
2352 struct net *net = sock_net(skb->sk);
2353 struct nlattr *attrs[XFRMA_MAX+1];
2354 const struct xfrm_link *link;
2355 int type, err;
2356
2357 type = nlh->nlmsg_type;
2358 if (type > XFRM_MSG_MAX)
2359 return -EINVAL;
2360
2361 type -= XFRM_MSG_BASE;
2362 link = &xfrm_dispatch[type];
2363
2364 /* All operations require privileges, even GET */
2365 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2366 return -EPERM;
2367
2368 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2369 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2370 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2371 if (link->dump == NULL)
2372 return -EINVAL;
2373
2374 {
2375 struct netlink_dump_control c = {
2376 .dump = link->dump,
2377 .done = link->done,
2378 };
2379 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2380 }
2381 }
2382
2383 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2384 xfrma_policy);
2385 if (err < 0)
2386 return err;
2387
2388 if (link->doit == NULL)
2389 return -EINVAL;
2390
2391 return link->doit(skb, nlh, attrs);
2392 }
2393
2394 static void xfrm_netlink_rcv(struct sk_buff *skb)
2395 {
2396 mutex_lock(&xfrm_cfg_mutex);
2397 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2398 mutex_unlock(&xfrm_cfg_mutex);
2399 }
2400
2401 static inline size_t xfrm_expire_msgsize(void)
2402 {
2403 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2404 + nla_total_size(sizeof(struct xfrm_mark));
2405 }
2406
2407 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2408 {
2409 struct xfrm_user_expire *ue;
2410 struct nlmsghdr *nlh;
2411 int err;
2412
2413 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2414 if (nlh == NULL)
2415 return -EMSGSIZE;
2416
2417 ue = nlmsg_data(nlh);
2418 copy_to_user_state(x, &ue->state);
2419 ue->hard = (c->data.hard != 0) ? 1 : 0;
2420
2421 err = xfrm_mark_put(skb, &x->mark);
2422 if (err)
2423 return err;
2424
2425 return nlmsg_end(skb, nlh);
2426 }
2427
2428 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2429 {
2430 struct net *net = xs_net(x);
2431 struct sk_buff *skb;
2432
2433 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2434 if (skb == NULL)
2435 return -ENOMEM;
2436
2437 if (build_expire(skb, x, c) < 0) {
2438 kfree_skb(skb);
2439 return -EMSGSIZE;
2440 }
2441
2442 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2443 }
2444
2445 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2446 {
2447 struct net *net = xs_net(x);
2448 struct sk_buff *skb;
2449
2450 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2451 if (skb == NULL)
2452 return -ENOMEM;
2453
2454 if (build_aevent(skb, x, c) < 0)
2455 BUG();
2456
2457 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2458 }
2459
2460 static int xfrm_notify_sa_flush(const struct km_event *c)
2461 {
2462 struct net *net = c->net;
2463 struct xfrm_usersa_flush *p;
2464 struct nlmsghdr *nlh;
2465 struct sk_buff *skb;
2466 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2467
2468 skb = nlmsg_new(len, GFP_ATOMIC);
2469 if (skb == NULL)
2470 return -ENOMEM;
2471
2472 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2473 if (nlh == NULL) {
2474 kfree_skb(skb);
2475 return -EMSGSIZE;
2476 }
2477
2478 p = nlmsg_data(nlh);
2479 p->proto = c->data.proto;
2480
2481 nlmsg_end(skb, nlh);
2482
2483 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2484 }
2485
2486 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2487 {
2488 size_t l = 0;
2489 if (x->aead)
2490 l += nla_total_size(aead_len(x->aead));
2491 if (x->aalg) {
2492 l += nla_total_size(sizeof(struct xfrm_algo) +
2493 (x->aalg->alg_key_len + 7) / 8);
2494 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2495 }
2496 if (x->ealg)
2497 l += nla_total_size(xfrm_alg_len(x->ealg));
2498 if (x->calg)
2499 l += nla_total_size(sizeof(*x->calg));
2500 if (x->encap)
2501 l += nla_total_size(sizeof(*x->encap));
2502 if (x->tfcpad)
2503 l += nla_total_size(sizeof(x->tfcpad));
2504 if (x->replay_esn)
2505 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2506 if (x->security)
2507 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2508 x->security->ctx_len);
2509 if (x->coaddr)
2510 l += nla_total_size(sizeof(*x->coaddr));
2511 if (x->props.extra_flags)
2512 l += nla_total_size(sizeof(x->props.extra_flags));
2513
2514 /* Must count x->lastused as it may become non-zero behind our back. */
2515 l += nla_total_size(sizeof(u64));
2516
2517 return l;
2518 }
2519
2520 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2521 {
2522 struct net *net = xs_net(x);
2523 struct xfrm_usersa_info *p;
2524 struct xfrm_usersa_id *id;
2525 struct nlmsghdr *nlh;
2526 struct sk_buff *skb;
2527 int len = xfrm_sa_len(x);
2528 int headlen, err;
2529
2530 headlen = sizeof(*p);
2531 if (c->event == XFRM_MSG_DELSA) {
2532 len += nla_total_size(headlen);
2533 headlen = sizeof(*id);
2534 len += nla_total_size(sizeof(struct xfrm_mark));
2535 }
2536 len += NLMSG_ALIGN(headlen);
2537
2538 skb = nlmsg_new(len, GFP_ATOMIC);
2539 if (skb == NULL)
2540 return -ENOMEM;
2541
2542 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2543 err = -EMSGSIZE;
2544 if (nlh == NULL)
2545 goto out_free_skb;
2546
2547 p = nlmsg_data(nlh);
2548 if (c->event == XFRM_MSG_DELSA) {
2549 struct nlattr *attr;
2550
2551 id = nlmsg_data(nlh);
2552 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2553 id->spi = x->id.spi;
2554 id->family = x->props.family;
2555 id->proto = x->id.proto;
2556
2557 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2558 err = -EMSGSIZE;
2559 if (attr == NULL)
2560 goto out_free_skb;
2561
2562 p = nla_data(attr);
2563 }
2564 err = copy_to_user_state_extra(x, p, skb);
2565 if (err)
2566 goto out_free_skb;
2567
2568 nlmsg_end(skb, nlh);
2569
2570 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2571
2572 out_free_skb:
2573 kfree_skb(skb);
2574 return err;
2575 }
2576
2577 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2578 {
2579
2580 switch (c->event) {
2581 case XFRM_MSG_EXPIRE:
2582 return xfrm_exp_state_notify(x, c);
2583 case XFRM_MSG_NEWAE:
2584 return xfrm_aevent_state_notify(x, c);
2585 case XFRM_MSG_DELSA:
2586 case XFRM_MSG_UPDSA:
2587 case XFRM_MSG_NEWSA:
2588 return xfrm_notify_sa(x, c);
2589 case XFRM_MSG_FLUSHSA:
2590 return xfrm_notify_sa_flush(c);
2591 default:
2592 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2593 c->event);
2594 break;
2595 }
2596
2597 return 0;
2598
2599 }
2600
2601 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2602 struct xfrm_policy *xp)
2603 {
2604 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2605 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2606 + nla_total_size(sizeof(struct xfrm_mark))
2607 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2608 + userpolicy_type_attrsize();
2609 }
2610
2611 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2612 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2613 {
2614 __u32 seq = xfrm_get_acqseq();
2615 struct xfrm_user_acquire *ua;
2616 struct nlmsghdr *nlh;
2617 int err;
2618
2619 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2620 if (nlh == NULL)
2621 return -EMSGSIZE;
2622
2623 ua = nlmsg_data(nlh);
2624 memcpy(&ua->id, &x->id, sizeof(ua->id));
2625 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2626 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2627 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2628 ua->aalgos = xt->aalgos;
2629 ua->ealgos = xt->ealgos;
2630 ua->calgos = xt->calgos;
2631 ua->seq = x->km.seq = seq;
2632
2633 err = copy_to_user_tmpl(xp, skb);
2634 if (!err)
2635 err = copy_to_user_state_sec_ctx(x, skb);
2636 if (!err)
2637 err = copy_to_user_policy_type(xp->type, skb);
2638 if (!err)
2639 err = xfrm_mark_put(skb, &xp->mark);
2640 if (err) {
2641 nlmsg_cancel(skb, nlh);
2642 return err;
2643 }
2644
2645 return nlmsg_end(skb, nlh);
2646 }
2647
2648 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2649 struct xfrm_policy *xp)
2650 {
2651 struct net *net = xs_net(x);
2652 struct sk_buff *skb;
2653
2654 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2655 if (skb == NULL)
2656 return -ENOMEM;
2657
2658 if (build_acquire(skb, x, xt, xp) < 0)
2659 BUG();
2660
2661 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2662 }
2663
2664 /* User gives us xfrm_user_policy_info followed by an array of 0
2665 * or more templates.
2666 */
2667 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2668 u8 *data, int len, int *dir)
2669 {
2670 struct net *net = sock_net(sk);
2671 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2672 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2673 struct xfrm_policy *xp;
2674 int nr;
2675
2676 switch (sk->sk_family) {
2677 case AF_INET:
2678 if (opt != IP_XFRM_POLICY) {
2679 *dir = -EOPNOTSUPP;
2680 return NULL;
2681 }
2682 break;
2683 #if IS_ENABLED(CONFIG_IPV6)
2684 case AF_INET6:
2685 if (opt != IPV6_XFRM_POLICY) {
2686 *dir = -EOPNOTSUPP;
2687 return NULL;
2688 }
2689 break;
2690 #endif
2691 default:
2692 *dir = -EINVAL;
2693 return NULL;
2694 }
2695
2696 *dir = -EINVAL;
2697
2698 if (len < sizeof(*p) ||
2699 verify_newpolicy_info(p))
2700 return NULL;
2701
2702 nr = ((len - sizeof(*p)) / sizeof(*ut));
2703 if (validate_tmpl(nr, ut, p->sel.family))
2704 return NULL;
2705
2706 if (p->dir > XFRM_POLICY_OUT)
2707 return NULL;
2708
2709 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2710 if (xp == NULL) {
2711 *dir = -ENOBUFS;
2712 return NULL;
2713 }
2714
2715 copy_from_user_policy(xp, p);
2716 xp->type = XFRM_POLICY_TYPE_MAIN;
2717 copy_templates(xp, ut, nr);
2718
2719 *dir = p->dir;
2720
2721 return xp;
2722 }
2723
2724 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2725 {
2726 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2727 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2728 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2729 + nla_total_size(sizeof(struct xfrm_mark))
2730 + userpolicy_type_attrsize();
2731 }
2732
2733 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2734 int dir, const struct km_event *c)
2735 {
2736 struct xfrm_user_polexpire *upe;
2737 int hard = c->data.hard;
2738 struct nlmsghdr *nlh;
2739 int err;
2740
2741 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2742 if (nlh == NULL)
2743 return -EMSGSIZE;
2744
2745 upe = nlmsg_data(nlh);
2746 copy_to_user_policy(xp, &upe->pol, dir);
2747 err = copy_to_user_tmpl(xp, skb);
2748 if (!err)
2749 err = copy_to_user_sec_ctx(xp, skb);
2750 if (!err)
2751 err = copy_to_user_policy_type(xp->type, skb);
2752 if (!err)
2753 err = xfrm_mark_put(skb, &xp->mark);
2754 if (err) {
2755 nlmsg_cancel(skb, nlh);
2756 return err;
2757 }
2758 upe->hard = !!hard;
2759
2760 return nlmsg_end(skb, nlh);
2761 }
2762
2763 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2764 {
2765 struct net *net = xp_net(xp);
2766 struct sk_buff *skb;
2767
2768 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2769 if (skb == NULL)
2770 return -ENOMEM;
2771
2772 if (build_polexpire(skb, xp, dir, c) < 0)
2773 BUG();
2774
2775 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2776 }
2777
2778 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2779 {
2780 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2781 struct net *net = xp_net(xp);
2782 struct xfrm_userpolicy_info *p;
2783 struct xfrm_userpolicy_id *id;
2784 struct nlmsghdr *nlh;
2785 struct sk_buff *skb;
2786 int headlen, err;
2787
2788 headlen = sizeof(*p);
2789 if (c->event == XFRM_MSG_DELPOLICY) {
2790 len += nla_total_size(headlen);
2791 headlen = sizeof(*id);
2792 }
2793 len += userpolicy_type_attrsize();
2794 len += nla_total_size(sizeof(struct xfrm_mark));
2795 len += NLMSG_ALIGN(headlen);
2796
2797 skb = nlmsg_new(len, GFP_ATOMIC);
2798 if (skb == NULL)
2799 return -ENOMEM;
2800
2801 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2802 err = -EMSGSIZE;
2803 if (nlh == NULL)
2804 goto out_free_skb;
2805
2806 p = nlmsg_data(nlh);
2807 if (c->event == XFRM_MSG_DELPOLICY) {
2808 struct nlattr *attr;
2809
2810 id = nlmsg_data(nlh);
2811 memset(id, 0, sizeof(*id));
2812 id->dir = dir;
2813 if (c->data.byid)
2814 id->index = xp->index;
2815 else
2816 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2817
2818 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2819 err = -EMSGSIZE;
2820 if (attr == NULL)
2821 goto out_free_skb;
2822
2823 p = nla_data(attr);
2824 }
2825
2826 copy_to_user_policy(xp, p, dir);
2827 err = copy_to_user_tmpl(xp, skb);
2828 if (!err)
2829 err = copy_to_user_policy_type(xp->type, skb);
2830 if (!err)
2831 err = xfrm_mark_put(skb, &xp->mark);
2832 if (err)
2833 goto out_free_skb;
2834
2835 nlmsg_end(skb, nlh);
2836
2837 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2838
2839 out_free_skb:
2840 kfree_skb(skb);
2841 return err;
2842 }
2843
2844 static int xfrm_notify_policy_flush(const struct km_event *c)
2845 {
2846 struct net *net = c->net;
2847 struct nlmsghdr *nlh;
2848 struct sk_buff *skb;
2849 int err;
2850
2851 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2852 if (skb == NULL)
2853 return -ENOMEM;
2854
2855 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2856 err = -EMSGSIZE;
2857 if (nlh == NULL)
2858 goto out_free_skb;
2859 err = copy_to_user_policy_type(c->data.type, skb);
2860 if (err)
2861 goto out_free_skb;
2862
2863 nlmsg_end(skb, nlh);
2864
2865 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2866
2867 out_free_skb:
2868 kfree_skb(skb);
2869 return err;
2870 }
2871
2872 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2873 {
2874
2875 switch (c->event) {
2876 case XFRM_MSG_NEWPOLICY:
2877 case XFRM_MSG_UPDPOLICY:
2878 case XFRM_MSG_DELPOLICY:
2879 return xfrm_notify_policy(xp, dir, c);
2880 case XFRM_MSG_FLUSHPOLICY:
2881 return xfrm_notify_policy_flush(c);
2882 case XFRM_MSG_POLEXPIRE:
2883 return xfrm_exp_policy_notify(xp, dir, c);
2884 default:
2885 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2886 c->event);
2887 }
2888
2889 return 0;
2890
2891 }
2892
2893 static inline size_t xfrm_report_msgsize(void)
2894 {
2895 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2896 }
2897
2898 static int build_report(struct sk_buff *skb, u8 proto,
2899 struct xfrm_selector *sel, xfrm_address_t *addr)
2900 {
2901 struct xfrm_user_report *ur;
2902 struct nlmsghdr *nlh;
2903
2904 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2905 if (nlh == NULL)
2906 return -EMSGSIZE;
2907
2908 ur = nlmsg_data(nlh);
2909 ur->proto = proto;
2910 memcpy(&ur->sel, sel, sizeof(ur->sel));
2911
2912 if (addr) {
2913 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2914 if (err) {
2915 nlmsg_cancel(skb, nlh);
2916 return err;
2917 }
2918 }
2919 return nlmsg_end(skb, nlh);
2920 }
2921
2922 static int xfrm_send_report(struct net *net, u8 proto,
2923 struct xfrm_selector *sel, xfrm_address_t *addr)
2924 {
2925 struct sk_buff *skb;
2926
2927 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2928 if (skb == NULL)
2929 return -ENOMEM;
2930
2931 if (build_report(skb, proto, sel, addr) < 0)
2932 BUG();
2933
2934 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2935 }
2936
2937 static inline size_t xfrm_mapping_msgsize(void)
2938 {
2939 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2940 }
2941
2942 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2943 xfrm_address_t *new_saddr, __be16 new_sport)
2944 {
2945 struct xfrm_user_mapping *um;
2946 struct nlmsghdr *nlh;
2947
2948 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2949 if (nlh == NULL)
2950 return -EMSGSIZE;
2951
2952 um = nlmsg_data(nlh);
2953
2954 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2955 um->id.spi = x->id.spi;
2956 um->id.family = x->props.family;
2957 um->id.proto = x->id.proto;
2958 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2959 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2960 um->new_sport = new_sport;
2961 um->old_sport = x->encap->encap_sport;
2962 um->reqid = x->props.reqid;
2963
2964 return nlmsg_end(skb, nlh);
2965 }
2966
2967 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2968 __be16 sport)
2969 {
2970 struct net *net = xs_net(x);
2971 struct sk_buff *skb;
2972
2973 if (x->id.proto != IPPROTO_ESP)
2974 return -EINVAL;
2975
2976 if (!x->encap)
2977 return -EINVAL;
2978
2979 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2980 if (skb == NULL)
2981 return -ENOMEM;
2982
2983 if (build_mapping(skb, x, ipaddr, sport) < 0)
2984 BUG();
2985
2986 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2987 }
2988
2989 static struct xfrm_mgr netlink_mgr = {
2990 .id = "netlink",
2991 .notify = xfrm_send_state_notify,
2992 .acquire = xfrm_send_acquire,
2993 .compile_policy = xfrm_compile_policy,
2994 .notify_policy = xfrm_send_policy_notify,
2995 .report = xfrm_send_report,
2996 .migrate = xfrm_send_migrate,
2997 .new_mapping = xfrm_send_mapping,
2998 };
2999
3000 static int __net_init xfrm_user_net_init(struct net *net)
3001 {
3002 struct sock *nlsk;
3003 struct netlink_kernel_cfg cfg = {
3004 .groups = XFRMNLGRP_MAX,
3005 .input = xfrm_netlink_rcv,
3006 };
3007
3008 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3009 if (nlsk == NULL)
3010 return -ENOMEM;
3011 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3012 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3013 return 0;
3014 }
3015
3016 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3017 {
3018 struct net *net;
3019 list_for_each_entry(net, net_exit_list, exit_list)
3020 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3021 synchronize_net();
3022 list_for_each_entry(net, net_exit_list, exit_list)
3023 netlink_kernel_release(net->xfrm.nlsk_stash);
3024 }
3025
3026 static struct pernet_operations xfrm_user_net_ops = {
3027 .init = xfrm_user_net_init,
3028 .exit_batch = xfrm_user_net_exit,
3029 };
3030
3031 static int __init xfrm_user_init(void)
3032 {
3033 int rv;
3034
3035 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3036
3037 rv = register_pernet_subsys(&xfrm_user_net_ops);
3038 if (rv < 0)
3039 return rv;
3040 rv = xfrm_register_km(&netlink_mgr);
3041 if (rv < 0)
3042 unregister_pernet_subsys(&xfrm_user_net_ops);
3043 return rv;
3044 }
3045
3046 static void __exit xfrm_user_exit(void)
3047 {
3048 xfrm_unregister_km(&netlink_mgr);
3049 unregister_pernet_subsys(&xfrm_user_net_ops);
3050 }
3051
3052 module_init(xfrm_user_init);
3053 module_exit(xfrm_user_exit);
3054 MODULE_LICENSE("GPL");
3055 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3056
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