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Merge tag 'nfsd-5.2-2' of git://linux-nfs.org/~bfields/linux
[linux-2.6/linux-2.6-arm.git] / net / xfrm / xfrm_user.c
blob173477211e4027bd0810ba8833eb62f010733b64
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/crypto.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/socket.h>
20 #include <linux/string.h>
21 #include <linux/net.h>
22 #include <linux/skbuff.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <net/netlink.h>
30 #include <net/ah.h>
31 #include <linux/uaccess.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <linux/in6.h>
34 #endif
35 #include <asm/unaligned.h>
36
37 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38 {
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61 }
62
63 static int verify_auth_trunc(struct nlattr **attrs)
64 {
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77 }
78
79 static int verify_aead(struct nlattr **attrs)
80 {
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93 }
94
95 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97 {
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102 }
103
104 static inline int verify_sec_ctx_len(struct nlattr **attrs)
105 {
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
114 return -EINVAL;
115
116 return 0;
117 }
118
119 static inline int verify_replay(struct xfrm_usersa_info *p,
120 struct nlattr **attrs)
121 {
122 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
123 struct xfrm_replay_state_esn *rs;
124
125 if (!rt)
126 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136
137 /* As only ESP and AH support ESN feature. */
138 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
139 return -EINVAL;
140
141 if (p->replay_window != 0)
142 return -EINVAL;
143
144 return 0;
145 }
146
147 static int verify_newsa_info(struct xfrm_usersa_info *p,
148 struct nlattr **attrs)
149 {
150 int err;
151
152 err = -EINVAL;
153 switch (p->family) {
154 case AF_INET:
155 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
156 goto out;
157
158 break;
159
160 case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
163 goto out;
164
165 break;
166 #else
167 err = -EAFNOSUPPORT;
168 goto out;
169 #endif
170
171 default:
172 goto out;
173 }
174
175 err = -EINVAL;
176 switch (p->id.proto) {
177 case IPPROTO_AH:
178 if ((!attrs[XFRMA_ALG_AUTH] &&
179 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
180 attrs[XFRMA_ALG_AEAD] ||
181 attrs[XFRMA_ALG_CRYPT] ||
182 attrs[XFRMA_ALG_COMP] ||
183 attrs[XFRMA_TFCPAD])
184 goto out;
185 break;
186
187 case IPPROTO_ESP:
188 if (attrs[XFRMA_ALG_COMP])
189 goto out;
190 if (!attrs[XFRMA_ALG_AUTH] &&
191 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
192 !attrs[XFRMA_ALG_CRYPT] &&
193 !attrs[XFRMA_ALG_AEAD])
194 goto out;
195 if ((attrs[XFRMA_ALG_AUTH] ||
196 attrs[XFRMA_ALG_AUTH_TRUNC] ||
197 attrs[XFRMA_ALG_CRYPT]) &&
198 attrs[XFRMA_ALG_AEAD])
199 goto out;
200 if (attrs[XFRMA_TFCPAD] &&
201 p->mode != XFRM_MODE_TUNNEL)
202 goto out;
203 break;
204
205 case IPPROTO_COMP:
206 if (!attrs[XFRMA_ALG_COMP] ||
207 attrs[XFRMA_ALG_AEAD] ||
208 attrs[XFRMA_ALG_AUTH] ||
209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
210 attrs[XFRMA_ALG_CRYPT] ||
211 attrs[XFRMA_TFCPAD] ||
212 (ntohl(p->id.spi) >= 0x10000))
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_crypt(struct xfrm_state *x, struct nlattr *rta)
296 {
297 struct xfrm_algo *p, *ualg;
298 struct xfrm_algo_desc *algo;
299
300 if (!rta)
301 return 0;
302
303 ualg = nla_data(rta);
304
305 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
306 if (!algo)
307 return -ENOSYS;
308 x->props.ealgo = algo->desc.sadb_alg_id;
309
310 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
311 if (!p)
312 return -ENOMEM;
313
314 strcpy(p->alg_name, algo->name);
315 x->ealg = p;
316 x->geniv = algo->uinfo.encr.geniv;
317 return 0;
318 }
319
320 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
321 struct nlattr *rta)
322 {
323 struct xfrm_algo *ualg;
324 struct xfrm_algo_auth *p;
325 struct xfrm_algo_desc *algo;
326
327 if (!rta)
328 return 0;
329
330 ualg = nla_data(rta);
331
332 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
333 if (!algo)
334 return -ENOSYS;
335 *props = algo->desc.sadb_alg_id;
336
337 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
338 if (!p)
339 return -ENOMEM;
340
341 strcpy(p->alg_name, algo->name);
342 p->alg_key_len = ualg->alg_key_len;
343 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
344 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
345
346 *algpp = p;
347 return 0;
348 }
349
350 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
351 struct nlattr *rta)
352 {
353 struct xfrm_algo_auth *p, *ualg;
354 struct xfrm_algo_desc *algo;
355
356 if (!rta)
357 return 0;
358
359 ualg = nla_data(rta);
360
361 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
362 if (!algo)
363 return -ENOSYS;
364 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
365 return -EINVAL;
366 *props = algo->desc.sadb_alg_id;
367
368 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
369 if (!p)
370 return -ENOMEM;
371
372 strcpy(p->alg_name, algo->name);
373 if (!p->alg_trunc_len)
374 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
375
376 *algpp = p;
377 return 0;
378 }
379
380 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
381 {
382 struct xfrm_algo_aead *p, *ualg;
383 struct xfrm_algo_desc *algo;
384
385 if (!rta)
386 return 0;
387
388 ualg = nla_data(rta);
389
390 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
391 if (!algo)
392 return -ENOSYS;
393 x->props.ealgo = algo->desc.sadb_alg_id;
394
395 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
396 if (!p)
397 return -ENOMEM;
398
399 strcpy(p->alg_name, algo->name);
400 x->aead = p;
401 x->geniv = algo->uinfo.aead.geniv;
402 return 0;
403 }
404
405 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
406 struct nlattr *rp)
407 {
408 struct xfrm_replay_state_esn *up;
409 unsigned int ulen;
410
411 if (!replay_esn || !rp)
412 return 0;
413
414 up = nla_data(rp);
415 ulen = xfrm_replay_state_esn_len(up);
416
417 /* Check the overall length and the internal bitmap length to avoid
418 * potential overflow. */
419 if (nla_len(rp) < (int)ulen ||
420 xfrm_replay_state_esn_len(replay_esn) != ulen ||
421 replay_esn->bmp_len != up->bmp_len)
422 return -EINVAL;
423
424 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
425 return -EINVAL;
426
427 return 0;
428 }
429
430 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
431 struct xfrm_replay_state_esn **preplay_esn,
432 struct nlattr *rta)
433 {
434 struct xfrm_replay_state_esn *p, *pp, *up;
435 unsigned int klen, ulen;
436
437 if (!rta)
438 return 0;
439
440 up = nla_data(rta);
441 klen = xfrm_replay_state_esn_len(up);
442 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
443
444 p = kzalloc(klen, GFP_KERNEL);
445 if (!p)
446 return -ENOMEM;
447
448 pp = kzalloc(klen, GFP_KERNEL);
449 if (!pp) {
450 kfree(p);
451 return -ENOMEM;
452 }
453
454 memcpy(p, up, ulen);
455 memcpy(pp, up, ulen);
456
457 *replay_esn = p;
458 *preplay_esn = pp;
459
460 return 0;
461 }
462
463 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
464 {
465 unsigned int len = 0;
466
467 if (xfrm_ctx) {
468 len += sizeof(struct xfrm_user_sec_ctx);
469 len += xfrm_ctx->ctx_len;
470 }
471 return len;
472 }
473
474 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
475 {
476 memcpy(&x->id, &p->id, sizeof(x->id));
477 memcpy(&x->sel, &p->sel, sizeof(x->sel));
478 memcpy(&x->lft, &p->lft, sizeof(x->lft));
479 x->props.mode = p->mode;
480 x->props.replay_window = min_t(unsigned int, p->replay_window,
481 sizeof(x->replay.bitmap) * 8);
482 x->props.reqid = p->reqid;
483 x->props.family = p->family;
484 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
485 x->props.flags = p->flags;
486
487 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
488 x->sel.family = p->family;
489 }
490
491 /*
492 * someday when pfkey also has support, we could have the code
493 * somehow made shareable and move it to xfrm_state.c - JHS
494 *
495 */
496 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
497 int update_esn)
498 {
499 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
500 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
501 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
502 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
503 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
504
505 if (re) {
506 struct xfrm_replay_state_esn *replay_esn;
507 replay_esn = nla_data(re);
508 memcpy(x->replay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
510 memcpy(x->preplay_esn, replay_esn,
511 xfrm_replay_state_esn_len(replay_esn));
512 }
513
514 if (rp) {
515 struct xfrm_replay_state *replay;
516 replay = nla_data(rp);
517 memcpy(&x->replay, replay, sizeof(*replay));
518 memcpy(&x->preplay, replay, sizeof(*replay));
519 }
520
521 if (lt) {
522 struct xfrm_lifetime_cur *ltime;
523 ltime = nla_data(lt);
524 x->curlft.bytes = ltime->bytes;
525 x->curlft.packets = ltime->packets;
526 x->curlft.add_time = ltime->add_time;
527 x->curlft.use_time = ltime->use_time;
528 }
529
530 if (et)
531 x->replay_maxage = nla_get_u32(et);
532
533 if (rt)
534 x->replay_maxdiff = nla_get_u32(rt);
535 }
536
537 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
538 {
539 if (attrs[XFRMA_SET_MARK]) {
540 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
541 if (attrs[XFRMA_SET_MARK_MASK])
542 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
543 else
544 m->m = 0xffffffff;
545 } else {
546 m->v = m->m = 0;
547 }
548 }
549
550 static struct xfrm_state *xfrm_state_construct(struct net *net,
551 struct xfrm_usersa_info *p,
552 struct nlattr **attrs,
553 int *errp)
554 {
555 struct xfrm_state *x = xfrm_state_alloc(net);
556 int err = -ENOMEM;
557
558 if (!x)
559 goto error_no_put;
560
561 copy_from_user_state(x, p);
562
563 if (attrs[XFRMA_SA_EXTRA_FLAGS])
564 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
565
566 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
567 goto error;
568 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
569 attrs[XFRMA_ALG_AUTH_TRUNC])))
570 goto error;
571 if (!x->props.aalgo) {
572 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
573 attrs[XFRMA_ALG_AUTH])))
574 goto error;
575 }
576 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
577 goto error;
578 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
579 xfrm_calg_get_byname,
580 attrs[XFRMA_ALG_COMP])))
581 goto error;
582
583 if (attrs[XFRMA_ENCAP]) {
584 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
585 sizeof(*x->encap), GFP_KERNEL);
586 if (x->encap == NULL)
587 goto error;
588 }
589
590 if (attrs[XFRMA_TFCPAD])
591 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
592
593 if (attrs[XFRMA_COADDR]) {
594 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
595 sizeof(*x->coaddr), GFP_KERNEL);
596 if (x->coaddr == NULL)
597 goto error;
598 }
599
600 xfrm_mark_get(attrs, &x->mark);
601
602 xfrm_smark_init(attrs, &x->props.smark);
603
604 if (attrs[XFRMA_IF_ID])
605 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
606
607 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
608 if (err)
609 goto error;
610
611 if (attrs[XFRMA_SEC_CTX]) {
612 err = security_xfrm_state_alloc(x,
613 nla_data(attrs[XFRMA_SEC_CTX]));
614 if (err)
615 goto error;
616 }
617
618 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
619 attrs[XFRMA_REPLAY_ESN_VAL])))
620 goto error;
621
622 x->km.seq = p->seq;
623 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
624 /* sysctl_xfrm_aevent_etime is in 100ms units */
625 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
626
627 if ((err = xfrm_init_replay(x)))
628 goto error;
629
630 /* override default values from above */
631 xfrm_update_ae_params(x, attrs, 0);
632
633 /* configure the hardware if offload is requested */
634 if (attrs[XFRMA_OFFLOAD_DEV]) {
635 err = xfrm_dev_state_add(net, x,
636 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
637 if (err)
638 goto error;
639 }
640
641 return x;
642
643 error:
644 x->km.state = XFRM_STATE_DEAD;
645 xfrm_state_put(x);
646 error_no_put:
647 *errp = err;
648 return NULL;
649 }
650
651 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
652 struct nlattr **attrs)
653 {
654 struct net *net = sock_net(skb->sk);
655 struct xfrm_usersa_info *p = nlmsg_data(nlh);
656 struct xfrm_state *x;
657 int err;
658 struct km_event c;
659
660 err = verify_newsa_info(p, attrs);
661 if (err)
662 return err;
663
664 x = xfrm_state_construct(net, p, attrs, &err);
665 if (!x)
666 return err;
667
668 xfrm_state_hold(x);
669 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
670 err = xfrm_state_add(x);
671 else
672 err = xfrm_state_update(x);
673
674 xfrm_audit_state_add(x, err ? 0 : 1, true);
675
676 if (err < 0) {
677 x->km.state = XFRM_STATE_DEAD;
678 xfrm_dev_state_delete(x);
679 __xfrm_state_put(x);
680 goto out;
681 }
682
683 if (x->km.state == XFRM_STATE_VOID)
684 x->km.state = XFRM_STATE_VALID;
685
686 c.seq = nlh->nlmsg_seq;
687 c.portid = nlh->nlmsg_pid;
688 c.event = nlh->nlmsg_type;
689
690 km_state_notify(x, &c);
691 out:
692 xfrm_state_put(x);
693 return err;
694 }
695
696 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
697 struct xfrm_usersa_id *p,
698 struct nlattr **attrs,
699 int *errp)
700 {
701 struct xfrm_state *x = NULL;
702 struct xfrm_mark m;
703 int err;
704 u32 mark = xfrm_mark_get(attrs, &m);
705
706 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
707 err = -ESRCH;
708 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
709 } else {
710 xfrm_address_t *saddr = NULL;
711
712 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
713 if (!saddr) {
714 err = -EINVAL;
715 goto out;
716 }
717
718 err = -ESRCH;
719 x = xfrm_state_lookup_byaddr(net, mark,
720 &p->daddr, saddr,
721 p->proto, p->family);
722 }
723
724 out:
725 if (!x && errp)
726 *errp = err;
727 return x;
728 }
729
730 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
731 struct nlattr **attrs)
732 {
733 struct net *net = sock_net(skb->sk);
734 struct xfrm_state *x;
735 int err = -ESRCH;
736 struct km_event c;
737 struct xfrm_usersa_id *p = nlmsg_data(nlh);
738
739 x = xfrm_user_state_lookup(net, p, attrs, &err);
740 if (x == NULL)
741 return err;
742
743 if ((err = security_xfrm_state_delete(x)) != 0)
744 goto out;
745
746 if (xfrm_state_kern(x)) {
747 err = -EPERM;
748 goto out;
749 }
750
751 err = xfrm_state_delete(x);
752
753 if (err < 0)
754 goto out;
755
756 c.seq = nlh->nlmsg_seq;
757 c.portid = nlh->nlmsg_pid;
758 c.event = nlh->nlmsg_type;
759 km_state_notify(x, &c);
760
761 out:
762 xfrm_audit_state_delete(x, err ? 0 : 1, true);
763 xfrm_state_put(x);
764 return err;
765 }
766
767 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
768 {
769 memset(p, 0, sizeof(*p));
770 memcpy(&p->id, &x->id, sizeof(p->id));
771 memcpy(&p->sel, &x->sel, sizeof(p->sel));
772 memcpy(&p->lft, &x->lft, sizeof(p->lft));
773 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
774 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
775 put_unaligned(x->stats.replay, &p->stats.replay);
776 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
777 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
778 p->mode = x->props.mode;
779 p->replay_window = x->props.replay_window;
780 p->reqid = x->props.reqid;
781 p->family = x->props.family;
782 p->flags = x->props.flags;
783 p->seq = x->km.seq;
784 }
785
786 struct xfrm_dump_info {
787 struct sk_buff *in_skb;
788 struct sk_buff *out_skb;
789 u32 nlmsg_seq;
790 u16 nlmsg_flags;
791 };
792
793 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
794 {
795 struct xfrm_user_sec_ctx *uctx;
796 struct nlattr *attr;
797 int ctx_size = sizeof(*uctx) + s->ctx_len;
798
799 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
800 if (attr == NULL)
801 return -EMSGSIZE;
802
803 uctx = nla_data(attr);
804 uctx->exttype = XFRMA_SEC_CTX;
805 uctx->len = ctx_size;
806 uctx->ctx_doi = s->ctx_doi;
807 uctx->ctx_alg = s->ctx_alg;
808 uctx->ctx_len = s->ctx_len;
809 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
810
811 return 0;
812 }
813
814 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
815 {
816 struct xfrm_user_offload *xuo;
817 struct nlattr *attr;
818
819 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 xuo = nla_data(attr);
824 memset(xuo, 0, sizeof(*xuo));
825 xuo->ifindex = xso->dev->ifindex;
826 xuo->flags = xso->flags;
827
828 return 0;
829 }
830
831 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
832 {
833 struct xfrm_algo *algo;
834 struct nlattr *nla;
835
836 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
837 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
838 if (!nla)
839 return -EMSGSIZE;
840
841 algo = nla_data(nla);
842 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
843 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
844 algo->alg_key_len = auth->alg_key_len;
845
846 return 0;
847 }
848
849 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
850 {
851 int ret = 0;
852
853 if (m->v | m->m) {
854 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
855 if (!ret)
856 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
857 }
858 return ret;
859 }
860
861 /* Don't change this without updating xfrm_sa_len! */
862 static int copy_to_user_state_extra(struct xfrm_state *x,
863 struct xfrm_usersa_info *p,
864 struct sk_buff *skb)
865 {
866 int ret = 0;
867
868 copy_to_user_state(x, p);
869
870 if (x->props.extra_flags) {
871 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
872 x->props.extra_flags);
873 if (ret)
874 goto out;
875 }
876
877 if (x->coaddr) {
878 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
879 if (ret)
880 goto out;
881 }
882 if (x->lastused) {
883 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
884 XFRMA_PAD);
885 if (ret)
886 goto out;
887 }
888 if (x->aead) {
889 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
890 if (ret)
891 goto out;
892 }
893 if (x->aalg) {
894 ret = copy_to_user_auth(x->aalg, skb);
895 if (!ret)
896 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
897 xfrm_alg_auth_len(x->aalg), x->aalg);
898 if (ret)
899 goto out;
900 }
901 if (x->ealg) {
902 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
903 if (ret)
904 goto out;
905 }
906 if (x->calg) {
907 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
908 if (ret)
909 goto out;
910 }
911 if (x->encap) {
912 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
913 if (ret)
914 goto out;
915 }
916 if (x->tfcpad) {
917 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
918 if (ret)
919 goto out;
920 }
921 ret = xfrm_mark_put(skb, &x->mark);
922 if (ret)
923 goto out;
924
925 ret = xfrm_smark_put(skb, &x->props.smark);
926 if (ret)
927 goto out;
928
929 if (x->replay_esn)
930 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
931 xfrm_replay_state_esn_len(x->replay_esn),
932 x->replay_esn);
933 else
934 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
935 &x->replay);
936 if (ret)
937 goto out;
938 if(x->xso.dev)
939 ret = copy_user_offload(&x->xso, skb);
940 if (ret)
941 goto out;
942 if (x->if_id) {
943 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
944 if (ret)
945 goto out;
946 }
947 if (x->security)
948 ret = copy_sec_ctx(x->security, skb);
949 out:
950 return ret;
951 }
952
953 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
954 {
955 struct xfrm_dump_info *sp = ptr;
956 struct sk_buff *in_skb = sp->in_skb;
957 struct sk_buff *skb = sp->out_skb;
958 struct xfrm_usersa_info *p;
959 struct nlmsghdr *nlh;
960 int err;
961
962 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
963 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
964 if (nlh == NULL)
965 return -EMSGSIZE;
966
967 p = nlmsg_data(nlh);
968
969 err = copy_to_user_state_extra(x, p, skb);
970 if (err) {
971 nlmsg_cancel(skb, nlh);
972 return err;
973 }
974 nlmsg_end(skb, nlh);
975 return 0;
976 }
977
978 static int xfrm_dump_sa_done(struct netlink_callback *cb)
979 {
980 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
981 struct sock *sk = cb->skb->sk;
982 struct net *net = sock_net(sk);
983
984 if (cb->args[0])
985 xfrm_state_walk_done(walk, net);
986 return 0;
987 }
988
989 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
990 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
991 {
992 struct net *net = sock_net(skb->sk);
993 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
994 struct xfrm_dump_info info;
995
996 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
997 sizeof(cb->args) - sizeof(cb->args[0]));
998
999 info.in_skb = cb->skb;
1000 info.out_skb = skb;
1001 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1002 info.nlmsg_flags = NLM_F_MULTI;
1003
1004 if (!cb->args[0]) {
1005 struct nlattr *attrs[XFRMA_MAX+1];
1006 struct xfrm_address_filter *filter = NULL;
1007 u8 proto = 0;
1008 int err;
1009
1010 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1011 xfrma_policy, cb->extack);
1012 if (err < 0)
1013 return err;
1014
1015 if (attrs[XFRMA_ADDRESS_FILTER]) {
1016 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1017 sizeof(*filter), GFP_KERNEL);
1018 if (filter == NULL)
1019 return -ENOMEM;
1020 }
1021
1022 if (attrs[XFRMA_PROTO])
1023 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1024
1025 xfrm_state_walk_init(walk, proto, filter);
1026 cb->args[0] = 1;
1027 }
1028
1029 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1030
1031 return skb->len;
1032 }
1033
1034 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1035 struct xfrm_state *x, u32 seq)
1036 {
1037 struct xfrm_dump_info info;
1038 struct sk_buff *skb;
1039 int err;
1040
1041 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1042 if (!skb)
1043 return ERR_PTR(-ENOMEM);
1044
1045 info.in_skb = in_skb;
1046 info.out_skb = skb;
1047 info.nlmsg_seq = seq;
1048 info.nlmsg_flags = 0;
1049
1050 err = dump_one_state(x, 0, &info);
1051 if (err) {
1052 kfree_skb(skb);
1053 return ERR_PTR(err);
1054 }
1055
1056 return skb;
1057 }
1058
1059 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1060 * Must be called with RCU read lock.
1061 */
1062 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1063 u32 pid, unsigned int group)
1064 {
1065 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1066
1067 if (!nlsk) {
1068 kfree_skb(skb);
1069 return -EPIPE;
1070 }
1071
1072 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1073 }
1074
1075 static inline unsigned int xfrm_spdinfo_msgsize(void)
1076 {
1077 return NLMSG_ALIGN(4)
1078 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1079 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1080 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1081 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1082 }
1083
1084 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1085 u32 portid, u32 seq, u32 flags)
1086 {
1087 struct xfrmk_spdinfo si;
1088 struct xfrmu_spdinfo spc;
1089 struct xfrmu_spdhinfo sph;
1090 struct xfrmu_spdhthresh spt4, spt6;
1091 struct nlmsghdr *nlh;
1092 int err;
1093 u32 *f;
1094 unsigned lseq;
1095
1096 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1097 if (nlh == NULL) /* shouldn't really happen ... */
1098 return -EMSGSIZE;
1099
1100 f = nlmsg_data(nlh);
1101 *f = flags;
1102 xfrm_spd_getinfo(net, &si);
1103 spc.incnt = si.incnt;
1104 spc.outcnt = si.outcnt;
1105 spc.fwdcnt = si.fwdcnt;
1106 spc.inscnt = si.inscnt;
1107 spc.outscnt = si.outscnt;
1108 spc.fwdscnt = si.fwdscnt;
1109 sph.spdhcnt = si.spdhcnt;
1110 sph.spdhmcnt = si.spdhmcnt;
1111
1112 do {
1113 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1114
1115 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1116 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1117 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1118 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1119 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1120
1121 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1122 if (!err)
1123 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1124 if (!err)
1125 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1126 if (!err)
1127 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1128 if (err) {
1129 nlmsg_cancel(skb, nlh);
1130 return err;
1131 }
1132
1133 nlmsg_end(skb, nlh);
1134 return 0;
1135 }
1136
1137 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1138 struct nlattr **attrs)
1139 {
1140 struct net *net = sock_net(skb->sk);
1141 struct xfrmu_spdhthresh *thresh4 = NULL;
1142 struct xfrmu_spdhthresh *thresh6 = NULL;
1143
1144 /* selector prefixlen thresholds to hash policies */
1145 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1146 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1147
1148 if (nla_len(rta) < sizeof(*thresh4))
1149 return -EINVAL;
1150 thresh4 = nla_data(rta);
1151 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1152 return -EINVAL;
1153 }
1154 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1155 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1156
1157 if (nla_len(rta) < sizeof(*thresh6))
1158 return -EINVAL;
1159 thresh6 = nla_data(rta);
1160 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1161 return -EINVAL;
1162 }
1163
1164 if (thresh4 || thresh6) {
1165 write_seqlock(&net->xfrm.policy_hthresh.lock);
1166 if (thresh4) {
1167 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1168 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1169 }
1170 if (thresh6) {
1171 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1172 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1173 }
1174 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1175
1176 xfrm_policy_hash_rebuild(net);
1177 }
1178
1179 return 0;
1180 }
1181
1182 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1183 struct nlattr **attrs)
1184 {
1185 struct net *net = sock_net(skb->sk);
1186 struct sk_buff *r_skb;
1187 u32 *flags = nlmsg_data(nlh);
1188 u32 sportid = NETLINK_CB(skb).portid;
1189 u32 seq = nlh->nlmsg_seq;
1190 int err;
1191
1192 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1193 if (r_skb == NULL)
1194 return -ENOMEM;
1195
1196 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1197 BUG_ON(err < 0);
1198
1199 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1200 }
1201
1202 static inline unsigned int xfrm_sadinfo_msgsize(void)
1203 {
1204 return NLMSG_ALIGN(4)
1205 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1206 + nla_total_size(4); /* XFRMA_SAD_CNT */
1207 }
1208
1209 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1210 u32 portid, u32 seq, u32 flags)
1211 {
1212 struct xfrmk_sadinfo si;
1213 struct xfrmu_sadhinfo sh;
1214 struct nlmsghdr *nlh;
1215 int err;
1216 u32 *f;
1217
1218 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1219 if (nlh == NULL) /* shouldn't really happen ... */
1220 return -EMSGSIZE;
1221
1222 f = nlmsg_data(nlh);
1223 *f = flags;
1224 xfrm_sad_getinfo(net, &si);
1225
1226 sh.sadhmcnt = si.sadhmcnt;
1227 sh.sadhcnt = si.sadhcnt;
1228
1229 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1230 if (!err)
1231 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1232 if (err) {
1233 nlmsg_cancel(skb, nlh);
1234 return err;
1235 }
1236
1237 nlmsg_end(skb, nlh);
1238 return 0;
1239 }
1240
1241 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1242 struct nlattr **attrs)
1243 {
1244 struct net *net = sock_net(skb->sk);
1245 struct sk_buff *r_skb;
1246 u32 *flags = nlmsg_data(nlh);
1247 u32 sportid = NETLINK_CB(skb).portid;
1248 u32 seq = nlh->nlmsg_seq;
1249 int err;
1250
1251 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1252 if (r_skb == NULL)
1253 return -ENOMEM;
1254
1255 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1256 BUG_ON(err < 0);
1257
1258 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1259 }
1260
1261 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1262 struct nlattr **attrs)
1263 {
1264 struct net *net = sock_net(skb->sk);
1265 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1266 struct xfrm_state *x;
1267 struct sk_buff *resp_skb;
1268 int err = -ESRCH;
1269
1270 x = xfrm_user_state_lookup(net, p, attrs, &err);
1271 if (x == NULL)
1272 goto out_noput;
1273
1274 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1275 if (IS_ERR(resp_skb)) {
1276 err = PTR_ERR(resp_skb);
1277 } else {
1278 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1279 }
1280 xfrm_state_put(x);
1281 out_noput:
1282 return err;
1283 }
1284
1285 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1286 struct nlattr **attrs)
1287 {
1288 struct net *net = sock_net(skb->sk);
1289 struct xfrm_state *x;
1290 struct xfrm_userspi_info *p;
1291 struct sk_buff *resp_skb;
1292 xfrm_address_t *daddr;
1293 int family;
1294 int err;
1295 u32 mark;
1296 struct xfrm_mark m;
1297 u32 if_id = 0;
1298
1299 p = nlmsg_data(nlh);
1300 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1301 if (err)
1302 goto out_noput;
1303
1304 family = p->info.family;
1305 daddr = &p->info.id.daddr;
1306
1307 x = NULL;
1308
1309 mark = xfrm_mark_get(attrs, &m);
1310
1311 if (attrs[XFRMA_IF_ID])
1312 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1313
1314 if (p->info.seq) {
1315 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1316 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1317 xfrm_state_put(x);
1318 x = NULL;
1319 }
1320 }
1321
1322 if (!x)
1323 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1324 if_id, p->info.id.proto, daddr,
1325 &p->info.saddr, 1,
1326 family);
1327 err = -ENOENT;
1328 if (x == NULL)
1329 goto out_noput;
1330
1331 err = xfrm_alloc_spi(x, p->min, p->max);
1332 if (err)
1333 goto out;
1334
1335 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1336 if (IS_ERR(resp_skb)) {
1337 err = PTR_ERR(resp_skb);
1338 goto out;
1339 }
1340
1341 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1342
1343 out:
1344 xfrm_state_put(x);
1345 out_noput:
1346 return err;
1347 }
1348
1349 static int verify_policy_dir(u8 dir)
1350 {
1351 switch (dir) {
1352 case XFRM_POLICY_IN:
1353 case XFRM_POLICY_OUT:
1354 case XFRM_POLICY_FWD:
1355 break;
1356
1357 default:
1358 return -EINVAL;
1359 }
1360
1361 return 0;
1362 }
1363
1364 static int verify_policy_type(u8 type)
1365 {
1366 switch (type) {
1367 case XFRM_POLICY_TYPE_MAIN:
1368 #ifdef CONFIG_XFRM_SUB_POLICY
1369 case XFRM_POLICY_TYPE_SUB:
1370 #endif
1371 break;
1372
1373 default:
1374 return -EINVAL;
1375 }
1376
1377 return 0;
1378 }
1379
1380 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1381 {
1382 int ret;
1383
1384 switch (p->share) {
1385 case XFRM_SHARE_ANY:
1386 case XFRM_SHARE_SESSION:
1387 case XFRM_SHARE_USER:
1388 case XFRM_SHARE_UNIQUE:
1389 break;
1390
1391 default:
1392 return -EINVAL;
1393 }
1394
1395 switch (p->action) {
1396 case XFRM_POLICY_ALLOW:
1397 case XFRM_POLICY_BLOCK:
1398 break;
1399
1400 default:
1401 return -EINVAL;
1402 }
1403
1404 switch (p->sel.family) {
1405 case AF_INET:
1406 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1407 return -EINVAL;
1408
1409 break;
1410
1411 case AF_INET6:
1412 #if IS_ENABLED(CONFIG_IPV6)
1413 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1414 return -EINVAL;
1415
1416 break;
1417 #else
1418 return -EAFNOSUPPORT;
1419 #endif
1420
1421 default:
1422 return -EINVAL;
1423 }
1424
1425 ret = verify_policy_dir(p->dir);
1426 if (ret)
1427 return ret;
1428 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1429 return -EINVAL;
1430
1431 return 0;
1432 }
1433
1434 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1435 {
1436 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1437 struct xfrm_user_sec_ctx *uctx;
1438
1439 if (!rt)
1440 return 0;
1441
1442 uctx = nla_data(rt);
1443 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1444 }
1445
1446 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1447 int nr)
1448 {
1449 int i;
1450
1451 xp->xfrm_nr = nr;
1452 for (i = 0; i < nr; i++, ut++) {
1453 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1454
1455 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1456 memcpy(&t->saddr, &ut->saddr,
1457 sizeof(xfrm_address_t));
1458 t->reqid = ut->reqid;
1459 t->mode = ut->mode;
1460 t->share = ut->share;
1461 t->optional = ut->optional;
1462 t->aalgos = ut->aalgos;
1463 t->ealgos = ut->ealgos;
1464 t->calgos = ut->calgos;
1465 /* If all masks are ~0, then we allow all algorithms. */
1466 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1467 t->encap_family = ut->family;
1468 }
1469 }
1470
1471 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1472 {
1473 u16 prev_family;
1474 int i;
1475
1476 if (nr > XFRM_MAX_DEPTH)
1477 return -EINVAL;
1478
1479 prev_family = family;
1480
1481 for (i = 0; i < nr; i++) {
1482 /* We never validated the ut->family value, so many
1483 * applications simply leave it at zero. The check was
1484 * never made and ut->family was ignored because all
1485 * templates could be assumed to have the same family as
1486 * the policy itself. Now that we will have ipv4-in-ipv6
1487 * and ipv6-in-ipv4 tunnels, this is no longer true.
1488 */
1489 if (!ut[i].family)
1490 ut[i].family = family;
1491
1492 switch (ut[i].mode) {
1493 case XFRM_MODE_TUNNEL:
1494 case XFRM_MODE_BEET:
1495 break;
1496 default:
1497 if (ut[i].family != prev_family)
1498 return -EINVAL;
1499 break;
1500 }
1501 if (ut[i].mode >= XFRM_MODE_MAX)
1502 return -EINVAL;
1503
1504 prev_family = ut[i].family;
1505
1506 switch (ut[i].family) {
1507 case AF_INET:
1508 break;
1509 #if IS_ENABLED(CONFIG_IPV6)
1510 case AF_INET6:
1511 break;
1512 #endif
1513 default:
1514 return -EINVAL;
1515 }
1516
1517 if (!xfrm_id_proto_valid(ut[i].id.proto))
1518 return -EINVAL;
1519 }
1520
1521 return 0;
1522 }
1523
1524 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1525 {
1526 struct nlattr *rt = attrs[XFRMA_TMPL];
1527
1528 if (!rt) {
1529 pol->xfrm_nr = 0;
1530 } else {
1531 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1532 int nr = nla_len(rt) / sizeof(*utmpl);
1533 int err;
1534
1535 err = validate_tmpl(nr, utmpl, pol->family);
1536 if (err)
1537 return err;
1538
1539 copy_templates(pol, utmpl, nr);
1540 }
1541 return 0;
1542 }
1543
1544 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1545 {
1546 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1547 struct xfrm_userpolicy_type *upt;
1548 u8 type = XFRM_POLICY_TYPE_MAIN;
1549 int err;
1550
1551 if (rt) {
1552 upt = nla_data(rt);
1553 type = upt->type;
1554 }
1555
1556 err = verify_policy_type(type);
1557 if (err)
1558 return err;
1559
1560 *tp = type;
1561 return 0;
1562 }
1563
1564 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1565 {
1566 xp->priority = p->priority;
1567 xp->index = p->index;
1568 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1569 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1570 xp->action = p->action;
1571 xp->flags = p->flags;
1572 xp->family = p->sel.family;
1573 /* XXX xp->share = p->share; */
1574 }
1575
1576 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1577 {
1578 memset(p, 0, sizeof(*p));
1579 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1580 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1581 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1582 p->priority = xp->priority;
1583 p->index = xp->index;
1584 p->sel.family = xp->family;
1585 p->dir = dir;
1586 p->action = xp->action;
1587 p->flags = xp->flags;
1588 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1589 }
1590
1591 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1592 {
1593 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1594 int err;
1595
1596 if (!xp) {
1597 *errp = -ENOMEM;
1598 return NULL;
1599 }
1600
1601 copy_from_user_policy(xp, p);
1602
1603 err = copy_from_user_policy_type(&xp->type, attrs);
1604 if (err)
1605 goto error;
1606
1607 if (!(err = copy_from_user_tmpl(xp, attrs)))
1608 err = copy_from_user_sec_ctx(xp, attrs);
1609 if (err)
1610 goto error;
1611
1612 xfrm_mark_get(attrs, &xp->mark);
1613
1614 if (attrs[XFRMA_IF_ID])
1615 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1616
1617 return xp;
1618 error:
1619 *errp = err;
1620 xp->walk.dead = 1;
1621 xfrm_policy_destroy(xp);
1622 return NULL;
1623 }
1624
1625 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1626 struct nlattr **attrs)
1627 {
1628 struct net *net = sock_net(skb->sk);
1629 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1630 struct xfrm_policy *xp;
1631 struct km_event c;
1632 int err;
1633 int excl;
1634
1635 err = verify_newpolicy_info(p);
1636 if (err)
1637 return err;
1638 err = verify_sec_ctx_len(attrs);
1639 if (err)
1640 return err;
1641
1642 xp = xfrm_policy_construct(net, p, attrs, &err);
1643 if (!xp)
1644 return err;
1645
1646 /* shouldn't excl be based on nlh flags??
1647 * Aha! this is anti-netlink really i.e more pfkey derived
1648 * in netlink excl is a flag and you wouldnt need
1649 * a type XFRM_MSG_UPDPOLICY - JHS */
1650 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1651 err = xfrm_policy_insert(p->dir, xp, excl);
1652 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1653
1654 if (err) {
1655 security_xfrm_policy_free(xp->security);
1656 kfree(xp);
1657 return err;
1658 }
1659
1660 c.event = nlh->nlmsg_type;
1661 c.seq = nlh->nlmsg_seq;
1662 c.portid = nlh->nlmsg_pid;
1663 km_policy_notify(xp, p->dir, &c);
1664
1665 xfrm_pol_put(xp);
1666
1667 return 0;
1668 }
1669
1670 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1671 {
1672 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1673 int i;
1674
1675 if (xp->xfrm_nr == 0)
1676 return 0;
1677
1678 for (i = 0; i < xp->xfrm_nr; i++) {
1679 struct xfrm_user_tmpl *up = &vec[i];
1680 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1681
1682 memset(up, 0, sizeof(*up));
1683 memcpy(&up->id, &kp->id, sizeof(up->id));
1684 up->family = kp->encap_family;
1685 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1686 up->reqid = kp->reqid;
1687 up->mode = kp->mode;
1688 up->share = kp->share;
1689 up->optional = kp->optional;
1690 up->aalgos = kp->aalgos;
1691 up->ealgos = kp->ealgos;
1692 up->calgos = kp->calgos;
1693 }
1694
1695 return nla_put(skb, XFRMA_TMPL,
1696 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1697 }
1698
1699 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1700 {
1701 if (x->security) {
1702 return copy_sec_ctx(x->security, skb);
1703 }
1704 return 0;
1705 }
1706
1707 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1708 {
1709 if (xp->security)
1710 return copy_sec_ctx(xp->security, skb);
1711 return 0;
1712 }
1713 static inline unsigned int userpolicy_type_attrsize(void)
1714 {
1715 #ifdef CONFIG_XFRM_SUB_POLICY
1716 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1717 #else
1718 return 0;
1719 #endif
1720 }
1721
1722 #ifdef CONFIG_XFRM_SUB_POLICY
1723 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1724 {
1725 struct xfrm_userpolicy_type upt;
1726
1727 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1728 memset(&upt, 0, sizeof(upt));
1729 upt.type = type;
1730
1731 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1732 }
1733
1734 #else
1735 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1736 {
1737 return 0;
1738 }
1739 #endif
1740
1741 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1742 {
1743 struct xfrm_dump_info *sp = ptr;
1744 struct xfrm_userpolicy_info *p;
1745 struct sk_buff *in_skb = sp->in_skb;
1746 struct sk_buff *skb = sp->out_skb;
1747 struct nlmsghdr *nlh;
1748 int err;
1749
1750 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1751 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1752 if (nlh == NULL)
1753 return -EMSGSIZE;
1754
1755 p = nlmsg_data(nlh);
1756 copy_to_user_policy(xp, p, dir);
1757 err = copy_to_user_tmpl(xp, skb);
1758 if (!err)
1759 err = copy_to_user_sec_ctx(xp, skb);
1760 if (!err)
1761 err = copy_to_user_policy_type(xp->type, skb);
1762 if (!err)
1763 err = xfrm_mark_put(skb, &xp->mark);
1764 if (!err)
1765 err = xfrm_if_id_put(skb, xp->if_id);
1766 if (err) {
1767 nlmsg_cancel(skb, nlh);
1768 return err;
1769 }
1770 nlmsg_end(skb, nlh);
1771 return 0;
1772 }
1773
1774 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1775 {
1776 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1777 struct net *net = sock_net(cb->skb->sk);
1778
1779 xfrm_policy_walk_done(walk, net);
1780 return 0;
1781 }
1782
1783 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1784 {
1785 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1786
1787 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1788
1789 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1790 return 0;
1791 }
1792
1793 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1794 {
1795 struct net *net = sock_net(skb->sk);
1796 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1797 struct xfrm_dump_info info;
1798
1799 info.in_skb = cb->skb;
1800 info.out_skb = skb;
1801 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1802 info.nlmsg_flags = NLM_F_MULTI;
1803
1804 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1805
1806 return skb->len;
1807 }
1808
1809 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1810 struct xfrm_policy *xp,
1811 int dir, u32 seq)
1812 {
1813 struct xfrm_dump_info info;
1814 struct sk_buff *skb;
1815 int err;
1816
1817 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1818 if (!skb)
1819 return ERR_PTR(-ENOMEM);
1820
1821 info.in_skb = in_skb;
1822 info.out_skb = skb;
1823 info.nlmsg_seq = seq;
1824 info.nlmsg_flags = 0;
1825
1826 err = dump_one_policy(xp, dir, 0, &info);
1827 if (err) {
1828 kfree_skb(skb);
1829 return ERR_PTR(err);
1830 }
1831
1832 return skb;
1833 }
1834
1835 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1836 struct nlattr **attrs)
1837 {
1838 struct net *net = sock_net(skb->sk);
1839 struct xfrm_policy *xp;
1840 struct xfrm_userpolicy_id *p;
1841 u8 type = XFRM_POLICY_TYPE_MAIN;
1842 int err;
1843 struct km_event c;
1844 int delete;
1845 struct xfrm_mark m;
1846 u32 mark = xfrm_mark_get(attrs, &m);
1847 u32 if_id = 0;
1848
1849 p = nlmsg_data(nlh);
1850 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1851
1852 err = copy_from_user_policy_type(&type, attrs);
1853 if (err)
1854 return err;
1855
1856 err = verify_policy_dir(p->dir);
1857 if (err)
1858 return err;
1859
1860 if (attrs[XFRMA_IF_ID])
1861 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1862
1863 if (p->index)
1864 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err);
1865 else {
1866 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1867 struct xfrm_sec_ctx *ctx;
1868
1869 err = verify_sec_ctx_len(attrs);
1870 if (err)
1871 return err;
1872
1873 ctx = NULL;
1874 if (rt) {
1875 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1876
1877 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1878 if (err)
1879 return err;
1880 }
1881 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
1882 ctx, delete, &err);
1883 security_xfrm_policy_free(ctx);
1884 }
1885 if (xp == NULL)
1886 return -ENOENT;
1887
1888 if (!delete) {
1889 struct sk_buff *resp_skb;
1890
1891 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1892 if (IS_ERR(resp_skb)) {
1893 err = PTR_ERR(resp_skb);
1894 } else {
1895 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1896 NETLINK_CB(skb).portid);
1897 }
1898 } else {
1899 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1900
1901 if (err != 0)
1902 goto out;
1903
1904 c.data.byid = p->index;
1905 c.event = nlh->nlmsg_type;
1906 c.seq = nlh->nlmsg_seq;
1907 c.portid = nlh->nlmsg_pid;
1908 km_policy_notify(xp, p->dir, &c);
1909 }
1910
1911 out:
1912 xfrm_pol_put(xp);
1913 return err;
1914 }
1915
1916 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1917 struct nlattr **attrs)
1918 {
1919 struct net *net = sock_net(skb->sk);
1920 struct km_event c;
1921 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1922 int err;
1923
1924 err = xfrm_state_flush(net, p->proto, true, false);
1925 if (err) {
1926 if (err == -ESRCH) /* empty table */
1927 return 0;
1928 return err;
1929 }
1930 c.data.proto = p->proto;
1931 c.event = nlh->nlmsg_type;
1932 c.seq = nlh->nlmsg_seq;
1933 c.portid = nlh->nlmsg_pid;
1934 c.net = net;
1935 km_state_notify(NULL, &c);
1936
1937 return 0;
1938 }
1939
1940 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1941 {
1942 unsigned int replay_size = x->replay_esn ?
1943 xfrm_replay_state_esn_len(x->replay_esn) :
1944 sizeof(struct xfrm_replay_state);
1945
1946 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1947 + nla_total_size(replay_size)
1948 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1949 + nla_total_size(sizeof(struct xfrm_mark))
1950 + nla_total_size(4) /* XFRM_AE_RTHR */
1951 + nla_total_size(4); /* XFRM_AE_ETHR */
1952 }
1953
1954 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1955 {
1956 struct xfrm_aevent_id *id;
1957 struct nlmsghdr *nlh;
1958 int err;
1959
1960 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1961 if (nlh == NULL)
1962 return -EMSGSIZE;
1963
1964 id = nlmsg_data(nlh);
1965 memset(&id->sa_id, 0, sizeof(id->sa_id));
1966 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1967 id->sa_id.spi = x->id.spi;
1968 id->sa_id.family = x->props.family;
1969 id->sa_id.proto = x->id.proto;
1970 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1971 id->reqid = x->props.reqid;
1972 id->flags = c->data.aevent;
1973
1974 if (x->replay_esn) {
1975 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1976 xfrm_replay_state_esn_len(x->replay_esn),
1977 x->replay_esn);
1978 } else {
1979 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1980 &x->replay);
1981 }
1982 if (err)
1983 goto out_cancel;
1984 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1985 XFRMA_PAD);
1986 if (err)
1987 goto out_cancel;
1988
1989 if (id->flags & XFRM_AE_RTHR) {
1990 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1991 if (err)
1992 goto out_cancel;
1993 }
1994 if (id->flags & XFRM_AE_ETHR) {
1995 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1996 x->replay_maxage * 10 / HZ);
1997 if (err)
1998 goto out_cancel;
1999 }
2000 err = xfrm_mark_put(skb, &x->mark);
2001 if (err)
2002 goto out_cancel;
2003
2004 err = xfrm_if_id_put(skb, x->if_id);
2005 if (err)
2006 goto out_cancel;
2007
2008 nlmsg_end(skb, nlh);
2009 return 0;
2010
2011 out_cancel:
2012 nlmsg_cancel(skb, nlh);
2013 return err;
2014 }
2015
2016 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2017 struct nlattr **attrs)
2018 {
2019 struct net *net = sock_net(skb->sk);
2020 struct xfrm_state *x;
2021 struct sk_buff *r_skb;
2022 int err;
2023 struct km_event c;
2024 u32 mark;
2025 struct xfrm_mark m;
2026 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2027 struct xfrm_usersa_id *id = &p->sa_id;
2028
2029 mark = xfrm_mark_get(attrs, &m);
2030
2031 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2032 if (x == NULL)
2033 return -ESRCH;
2034
2035 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2036 if (r_skb == NULL) {
2037 xfrm_state_put(x);
2038 return -ENOMEM;
2039 }
2040
2041 /*
2042 * XXX: is this lock really needed - none of the other
2043 * gets lock (the concern is things getting updated
2044 * while we are still reading) - jhs
2045 */
2046 spin_lock_bh(&x->lock);
2047 c.data.aevent = p->flags;
2048 c.seq = nlh->nlmsg_seq;
2049 c.portid = nlh->nlmsg_pid;
2050
2051 err = build_aevent(r_skb, x, &c);
2052 BUG_ON(err < 0);
2053
2054 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2055 spin_unlock_bh(&x->lock);
2056 xfrm_state_put(x);
2057 return err;
2058 }
2059
2060 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2061 struct nlattr **attrs)
2062 {
2063 struct net *net = sock_net(skb->sk);
2064 struct xfrm_state *x;
2065 struct km_event c;
2066 int err = -EINVAL;
2067 u32 mark = 0;
2068 struct xfrm_mark m;
2069 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2070 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2071 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2072 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2073 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2074 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2075
2076 if (!lt && !rp && !re && !et && !rt)
2077 return err;
2078
2079 /* pedantic mode - thou shalt sayeth replaceth */
2080 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2081 return err;
2082
2083 mark = xfrm_mark_get(attrs, &m);
2084
2085 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2086 if (x == NULL)
2087 return -ESRCH;
2088
2089 if (x->km.state != XFRM_STATE_VALID)
2090 goto out;
2091
2092 err = xfrm_replay_verify_len(x->replay_esn, re);
2093 if (err)
2094 goto out;
2095
2096 spin_lock_bh(&x->lock);
2097 xfrm_update_ae_params(x, attrs, 1);
2098 spin_unlock_bh(&x->lock);
2099
2100 c.event = nlh->nlmsg_type;
2101 c.seq = nlh->nlmsg_seq;
2102 c.portid = nlh->nlmsg_pid;
2103 c.data.aevent = XFRM_AE_CU;
2104 km_state_notify(x, &c);
2105 err = 0;
2106 out:
2107 xfrm_state_put(x);
2108 return err;
2109 }
2110
2111 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2112 struct nlattr **attrs)
2113 {
2114 struct net *net = sock_net(skb->sk);
2115 struct km_event c;
2116 u8 type = XFRM_POLICY_TYPE_MAIN;
2117 int err;
2118
2119 err = copy_from_user_policy_type(&type, attrs);
2120 if (err)
2121 return err;
2122
2123 err = xfrm_policy_flush(net, type, true);
2124 if (err) {
2125 if (err == -ESRCH) /* empty table */
2126 return 0;
2127 return err;
2128 }
2129
2130 c.data.type = type;
2131 c.event = nlh->nlmsg_type;
2132 c.seq = nlh->nlmsg_seq;
2133 c.portid = nlh->nlmsg_pid;
2134 c.net = net;
2135 km_policy_notify(NULL, 0, &c);
2136 return 0;
2137 }
2138
2139 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2140 struct nlattr **attrs)
2141 {
2142 struct net *net = sock_net(skb->sk);
2143 struct xfrm_policy *xp;
2144 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2145 struct xfrm_userpolicy_info *p = &up->pol;
2146 u8 type = XFRM_POLICY_TYPE_MAIN;
2147 int err = -ENOENT;
2148 struct xfrm_mark m;
2149 u32 mark = xfrm_mark_get(attrs, &m);
2150 u32 if_id = 0;
2151
2152 err = copy_from_user_policy_type(&type, attrs);
2153 if (err)
2154 return err;
2155
2156 err = verify_policy_dir(p->dir);
2157 if (err)
2158 return err;
2159
2160 if (attrs[XFRMA_IF_ID])
2161 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2162
2163 if (p->index)
2164 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err);
2165 else {
2166 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2167 struct xfrm_sec_ctx *ctx;
2168
2169 err = verify_sec_ctx_len(attrs);
2170 if (err)
2171 return err;
2172
2173 ctx = NULL;
2174 if (rt) {
2175 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2176
2177 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2178 if (err)
2179 return err;
2180 }
2181 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
2182 &p->sel, ctx, 0, &err);
2183 security_xfrm_policy_free(ctx);
2184 }
2185 if (xp == NULL)
2186 return -ENOENT;
2187
2188 if (unlikely(xp->walk.dead))
2189 goto out;
2190
2191 err = 0;
2192 if (up->hard) {
2193 xfrm_policy_delete(xp, p->dir);
2194 xfrm_audit_policy_delete(xp, 1, true);
2195 }
2196 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2197
2198 out:
2199 xfrm_pol_put(xp);
2200 return err;
2201 }
2202
2203 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2204 struct nlattr **attrs)
2205 {
2206 struct net *net = sock_net(skb->sk);
2207 struct xfrm_state *x;
2208 int err;
2209 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2210 struct xfrm_usersa_info *p = &ue->state;
2211 struct xfrm_mark m;
2212 u32 mark = xfrm_mark_get(attrs, &m);
2213
2214 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2215
2216 err = -ENOENT;
2217 if (x == NULL)
2218 return err;
2219
2220 spin_lock_bh(&x->lock);
2221 err = -EINVAL;
2222 if (x->km.state != XFRM_STATE_VALID)
2223 goto out;
2224 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2225
2226 if (ue->hard) {
2227 __xfrm_state_delete(x);
2228 xfrm_audit_state_delete(x, 1, true);
2229 }
2230 err = 0;
2231 out:
2232 spin_unlock_bh(&x->lock);
2233 xfrm_state_put(x);
2234 return err;
2235 }
2236
2237 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2238 struct nlattr **attrs)
2239 {
2240 struct net *net = sock_net(skb->sk);
2241 struct xfrm_policy *xp;
2242 struct xfrm_user_tmpl *ut;
2243 int i;
2244 struct nlattr *rt = attrs[XFRMA_TMPL];
2245 struct xfrm_mark mark;
2246
2247 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2248 struct xfrm_state *x = xfrm_state_alloc(net);
2249 int err = -ENOMEM;
2250
2251 if (!x)
2252 goto nomem;
2253
2254 xfrm_mark_get(attrs, &mark);
2255
2256 err = verify_newpolicy_info(&ua->policy);
2257 if (err)
2258 goto free_state;
2259
2260 /* build an XP */
2261 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2262 if (!xp)
2263 goto free_state;
2264
2265 memcpy(&x->id, &ua->id, sizeof(ua->id));
2266 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2267 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2268 xp->mark.m = x->mark.m = mark.m;
2269 xp->mark.v = x->mark.v = mark.v;
2270 ut = nla_data(rt);
2271 /* extract the templates and for each call km_key */
2272 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2273 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2274 memcpy(&x->id, &t->id, sizeof(x->id));
2275 x->props.mode = t->mode;
2276 x->props.reqid = t->reqid;
2277 x->props.family = ut->family;
2278 t->aalgos = ua->aalgos;
2279 t->ealgos = ua->ealgos;
2280 t->calgos = ua->calgos;
2281 err = km_query(x, t, xp);
2282
2283 }
2284
2285 xfrm_state_free(x);
2286 kfree(xp);
2287
2288 return 0;
2289
2290 free_state:
2291 xfrm_state_free(x);
2292 nomem:
2293 return err;
2294 }
2295
2296 #ifdef CONFIG_XFRM_MIGRATE
2297 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2298 struct xfrm_kmaddress *k,
2299 struct nlattr **attrs, int *num)
2300 {
2301 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2302 struct xfrm_user_migrate *um;
2303 int i, num_migrate;
2304
2305 if (k != NULL) {
2306 struct xfrm_user_kmaddress *uk;
2307
2308 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2309 memcpy(&k->local, &uk->local, sizeof(k->local));
2310 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2311 k->family = uk->family;
2312 k->reserved = uk->reserved;
2313 }
2314
2315 um = nla_data(rt);
2316 num_migrate = nla_len(rt) / sizeof(*um);
2317
2318 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2319 return -EINVAL;
2320
2321 for (i = 0; i < num_migrate; i++, um++, ma++) {
2322 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2323 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2324 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2325 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2326
2327 ma->proto = um->proto;
2328 ma->mode = um->mode;
2329 ma->reqid = um->reqid;
2330
2331 ma->old_family = um->old_family;
2332 ma->new_family = um->new_family;
2333 }
2334
2335 *num = i;
2336 return 0;
2337 }
2338
2339 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2340 struct nlattr **attrs)
2341 {
2342 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2343 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2344 struct xfrm_kmaddress km, *kmp;
2345 u8 type;
2346 int err;
2347 int n = 0;
2348 struct net *net = sock_net(skb->sk);
2349 struct xfrm_encap_tmpl *encap = NULL;
2350
2351 if (attrs[XFRMA_MIGRATE] == NULL)
2352 return -EINVAL;
2353
2354 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2355
2356 err = copy_from_user_policy_type(&type, attrs);
2357 if (err)
2358 return err;
2359
2360 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2361 if (err)
2362 return err;
2363
2364 if (!n)
2365 return 0;
2366
2367 if (attrs[XFRMA_ENCAP]) {
2368 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2369 sizeof(*encap), GFP_KERNEL);
2370 if (!encap)
2371 return 0;
2372 }
2373
2374 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2375
2376 kfree(encap);
2377
2378 return err;
2379 }
2380 #else
2381 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2382 struct nlattr **attrs)
2383 {
2384 return -ENOPROTOOPT;
2385 }
2386 #endif
2387
2388 #ifdef CONFIG_XFRM_MIGRATE
2389 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2390 {
2391 struct xfrm_user_migrate um;
2392
2393 memset(&um, 0, sizeof(um));
2394 um.proto = m->proto;
2395 um.mode = m->mode;
2396 um.reqid = m->reqid;
2397 um.old_family = m->old_family;
2398 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2399 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2400 um.new_family = m->new_family;
2401 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2402 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2403
2404 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2405 }
2406
2407 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2408 {
2409 struct xfrm_user_kmaddress uk;
2410
2411 memset(&uk, 0, sizeof(uk));
2412 uk.family = k->family;
2413 uk.reserved = k->reserved;
2414 memcpy(&uk.local, &k->local, sizeof(uk.local));
2415 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2416
2417 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2418 }
2419
2420 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2421 int with_encp)
2422 {
2423 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2424 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2425 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2426 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2427 + userpolicy_type_attrsize();
2428 }
2429
2430 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2431 int num_migrate, const struct xfrm_kmaddress *k,
2432 const struct xfrm_selector *sel,
2433 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2434 {
2435 const struct xfrm_migrate *mp;
2436 struct xfrm_userpolicy_id *pol_id;
2437 struct nlmsghdr *nlh;
2438 int i, err;
2439
2440 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2441 if (nlh == NULL)
2442 return -EMSGSIZE;
2443
2444 pol_id = nlmsg_data(nlh);
2445 /* copy data from selector, dir, and type to the pol_id */
2446 memset(pol_id, 0, sizeof(*pol_id));
2447 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2448 pol_id->dir = dir;
2449
2450 if (k != NULL) {
2451 err = copy_to_user_kmaddress(k, skb);
2452 if (err)
2453 goto out_cancel;
2454 }
2455 if (encap) {
2456 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2457 if (err)
2458 goto out_cancel;
2459 }
2460 err = copy_to_user_policy_type(type, skb);
2461 if (err)
2462 goto out_cancel;
2463 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2464 err = copy_to_user_migrate(mp, skb);
2465 if (err)
2466 goto out_cancel;
2467 }
2468
2469 nlmsg_end(skb, nlh);
2470 return 0;
2471
2472 out_cancel:
2473 nlmsg_cancel(skb, nlh);
2474 return err;
2475 }
2476
2477 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2478 const struct xfrm_migrate *m, int num_migrate,
2479 const struct xfrm_kmaddress *k,
2480 const struct xfrm_encap_tmpl *encap)
2481 {
2482 struct net *net = &init_net;
2483 struct sk_buff *skb;
2484 int err;
2485
2486 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2487 GFP_ATOMIC);
2488 if (skb == NULL)
2489 return -ENOMEM;
2490
2491 /* build migrate */
2492 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2493 BUG_ON(err < 0);
2494
2495 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2496 }
2497 #else
2498 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2499 const struct xfrm_migrate *m, int num_migrate,
2500 const struct xfrm_kmaddress *k,
2501 const struct xfrm_encap_tmpl *encap)
2502 {
2503 return -ENOPROTOOPT;
2504 }
2505 #endif
2506
2507 #define XMSGSIZE(type) sizeof(struct type)
2508
2509 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2510 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2511 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2512 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2513 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2514 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2515 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2516 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2517 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2518 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2519 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2520 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2521 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2522 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2523 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2524 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2525 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2526 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2527 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2528 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2529 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2530 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2531 };
2532
2533 #undef XMSGSIZE
2534
2535 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2536 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2537 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2538 [XFRMA_LASTUSED] = { .type = NLA_U64},
2539 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2540 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2541 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2542 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2543 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2544 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2545 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2546 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2547 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2548 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2549 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2550 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2551 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2552 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2553 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2554 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2555 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2556 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2557 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2558 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2559 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2560 [XFRMA_PROTO] = { .type = NLA_U8 },
2561 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2562 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2563 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2564 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2565 [XFRMA_IF_ID] = { .type = NLA_U32 },
2566 };
2567
2568 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2569 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2570 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2571 };
2572
2573 static const struct xfrm_link {
2574 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2575 int (*start)(struct netlink_callback *);
2576 int (*dump)(struct sk_buff *, struct netlink_callback *);
2577 int (*done)(struct netlink_callback *);
2578 const struct nla_policy *nla_pol;
2579 int nla_max;
2580 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2581 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2582 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2583 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2584 .dump = xfrm_dump_sa,
2585 .done = xfrm_dump_sa_done },
2586 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2587 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2588 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2589 .start = xfrm_dump_policy_start,
2590 .dump = xfrm_dump_policy,
2591 .done = xfrm_dump_policy_done },
2592 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2593 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2594 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2595 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2596 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2597 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2598 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2599 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2600 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2601 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2602 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2603 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2604 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2605 .nla_pol = xfrma_spd_policy,
2606 .nla_max = XFRMA_SPD_MAX },
2607 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2608 };
2609
2610 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2611 struct netlink_ext_ack *extack)
2612 {
2613 struct net *net = sock_net(skb->sk);
2614 struct nlattr *attrs[XFRMA_MAX+1];
2615 const struct xfrm_link *link;
2616 int type, err;
2617
2618 if (in_compat_syscall())
2619 return -EOPNOTSUPP;
2620
2621 type = nlh->nlmsg_type;
2622 if (type > XFRM_MSG_MAX)
2623 return -EINVAL;
2624
2625 type -= XFRM_MSG_BASE;
2626 link = &xfrm_dispatch[type];
2627
2628 /* All operations require privileges, even GET */
2629 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2630 return -EPERM;
2631
2632 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2633 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2634 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2635 if (link->dump == NULL)
2636 return -EINVAL;
2637
2638 {
2639 struct netlink_dump_control c = {
2640 .start = link->start,
2641 .dump = link->dump,
2642 .done = link->done,
2643 };
2644 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2645 }
2646 }
2647
2648 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2649 link->nla_max ? : XFRMA_MAX,
2650 link->nla_pol ? : xfrma_policy, extack);
2651 if (err < 0)
2652 return err;
2653
2654 if (link->doit == NULL)
2655 return -EINVAL;
2656
2657 return link->doit(skb, nlh, attrs);
2658 }
2659
2660 static void xfrm_netlink_rcv(struct sk_buff *skb)
2661 {
2662 struct net *net = sock_net(skb->sk);
2663
2664 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2665 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2666 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2667 }
2668
2669 static inline unsigned int xfrm_expire_msgsize(void)
2670 {
2671 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2672 + nla_total_size(sizeof(struct xfrm_mark));
2673 }
2674
2675 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2676 {
2677 struct xfrm_user_expire *ue;
2678 struct nlmsghdr *nlh;
2679 int err;
2680
2681 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2682 if (nlh == NULL)
2683 return -EMSGSIZE;
2684
2685 ue = nlmsg_data(nlh);
2686 copy_to_user_state(x, &ue->state);
2687 ue->hard = (c->data.hard != 0) ? 1 : 0;
2688 /* clear the padding bytes */
2689 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2690
2691 err = xfrm_mark_put(skb, &x->mark);
2692 if (err)
2693 return err;
2694
2695 err = xfrm_if_id_put(skb, x->if_id);
2696 if (err)
2697 return err;
2698
2699 nlmsg_end(skb, nlh);
2700 return 0;
2701 }
2702
2703 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2704 {
2705 struct net *net = xs_net(x);
2706 struct sk_buff *skb;
2707
2708 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2709 if (skb == NULL)
2710 return -ENOMEM;
2711
2712 if (build_expire(skb, x, c) < 0) {
2713 kfree_skb(skb);
2714 return -EMSGSIZE;
2715 }
2716
2717 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2718 }
2719
2720 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2721 {
2722 struct net *net = xs_net(x);
2723 struct sk_buff *skb;
2724 int err;
2725
2726 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2727 if (skb == NULL)
2728 return -ENOMEM;
2729
2730 err = build_aevent(skb, x, c);
2731 BUG_ON(err < 0);
2732
2733 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2734 }
2735
2736 static int xfrm_notify_sa_flush(const struct km_event *c)
2737 {
2738 struct net *net = c->net;
2739 struct xfrm_usersa_flush *p;
2740 struct nlmsghdr *nlh;
2741 struct sk_buff *skb;
2742 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2743
2744 skb = nlmsg_new(len, GFP_ATOMIC);
2745 if (skb == NULL)
2746 return -ENOMEM;
2747
2748 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2749 if (nlh == NULL) {
2750 kfree_skb(skb);
2751 return -EMSGSIZE;
2752 }
2753
2754 p = nlmsg_data(nlh);
2755 p->proto = c->data.proto;
2756
2757 nlmsg_end(skb, nlh);
2758
2759 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2760 }
2761
2762 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2763 {
2764 unsigned int l = 0;
2765 if (x->aead)
2766 l += nla_total_size(aead_len(x->aead));
2767 if (x->aalg) {
2768 l += nla_total_size(sizeof(struct xfrm_algo) +
2769 (x->aalg->alg_key_len + 7) / 8);
2770 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2771 }
2772 if (x->ealg)
2773 l += nla_total_size(xfrm_alg_len(x->ealg));
2774 if (x->calg)
2775 l += nla_total_size(sizeof(*x->calg));
2776 if (x->encap)
2777 l += nla_total_size(sizeof(*x->encap));
2778 if (x->tfcpad)
2779 l += nla_total_size(sizeof(x->tfcpad));
2780 if (x->replay_esn)
2781 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2782 else
2783 l += nla_total_size(sizeof(struct xfrm_replay_state));
2784 if (x->security)
2785 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2786 x->security->ctx_len);
2787 if (x->coaddr)
2788 l += nla_total_size(sizeof(*x->coaddr));
2789 if (x->props.extra_flags)
2790 l += nla_total_size(sizeof(x->props.extra_flags));
2791 if (x->xso.dev)
2792 l += nla_total_size(sizeof(x->xso));
2793 if (x->props.smark.v | x->props.smark.m) {
2794 l += nla_total_size(sizeof(x->props.smark.v));
2795 l += nla_total_size(sizeof(x->props.smark.m));
2796 }
2797 if (x->if_id)
2798 l += nla_total_size(sizeof(x->if_id));
2799
2800 /* Must count x->lastused as it may become non-zero behind our back. */
2801 l += nla_total_size_64bit(sizeof(u64));
2802
2803 return l;
2804 }
2805
2806 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2807 {
2808 struct net *net = xs_net(x);
2809 struct xfrm_usersa_info *p;
2810 struct xfrm_usersa_id *id;
2811 struct nlmsghdr *nlh;
2812 struct sk_buff *skb;
2813 unsigned int len = xfrm_sa_len(x);
2814 unsigned int headlen;
2815 int err;
2816
2817 headlen = sizeof(*p);
2818 if (c->event == XFRM_MSG_DELSA) {
2819 len += nla_total_size(headlen);
2820 headlen = sizeof(*id);
2821 len += nla_total_size(sizeof(struct xfrm_mark));
2822 }
2823 len += NLMSG_ALIGN(headlen);
2824
2825 skb = nlmsg_new(len, GFP_ATOMIC);
2826 if (skb == NULL)
2827 return -ENOMEM;
2828
2829 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2830 err = -EMSGSIZE;
2831 if (nlh == NULL)
2832 goto out_free_skb;
2833
2834 p = nlmsg_data(nlh);
2835 if (c->event == XFRM_MSG_DELSA) {
2836 struct nlattr *attr;
2837
2838 id = nlmsg_data(nlh);
2839 memset(id, 0, sizeof(*id));
2840 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2841 id->spi = x->id.spi;
2842 id->family = x->props.family;
2843 id->proto = x->id.proto;
2844
2845 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2846 err = -EMSGSIZE;
2847 if (attr == NULL)
2848 goto out_free_skb;
2849
2850 p = nla_data(attr);
2851 }
2852 err = copy_to_user_state_extra(x, p, skb);
2853 if (err)
2854 goto out_free_skb;
2855
2856 nlmsg_end(skb, nlh);
2857
2858 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2859
2860 out_free_skb:
2861 kfree_skb(skb);
2862 return err;
2863 }
2864
2865 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2866 {
2867
2868 switch (c->event) {
2869 case XFRM_MSG_EXPIRE:
2870 return xfrm_exp_state_notify(x, c);
2871 case XFRM_MSG_NEWAE:
2872 return xfrm_aevent_state_notify(x, c);
2873 case XFRM_MSG_DELSA:
2874 case XFRM_MSG_UPDSA:
2875 case XFRM_MSG_NEWSA:
2876 return xfrm_notify_sa(x, c);
2877 case XFRM_MSG_FLUSHSA:
2878 return xfrm_notify_sa_flush(c);
2879 default:
2880 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2881 c->event);
2882 break;
2883 }
2884
2885 return 0;
2886
2887 }
2888
2889 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2890 struct xfrm_policy *xp)
2891 {
2892 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2893 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2894 + nla_total_size(sizeof(struct xfrm_mark))
2895 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2896 + userpolicy_type_attrsize();
2897 }
2898
2899 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2900 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2901 {
2902 __u32 seq = xfrm_get_acqseq();
2903 struct xfrm_user_acquire *ua;
2904 struct nlmsghdr *nlh;
2905 int err;
2906
2907 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2908 if (nlh == NULL)
2909 return -EMSGSIZE;
2910
2911 ua = nlmsg_data(nlh);
2912 memcpy(&ua->id, &x->id, sizeof(ua->id));
2913 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2914 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2915 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2916 ua->aalgos = xt->aalgos;
2917 ua->ealgos = xt->ealgos;
2918 ua->calgos = xt->calgos;
2919 ua->seq = x->km.seq = seq;
2920
2921 err = copy_to_user_tmpl(xp, skb);
2922 if (!err)
2923 err = copy_to_user_state_sec_ctx(x, skb);
2924 if (!err)
2925 err = copy_to_user_policy_type(xp->type, skb);
2926 if (!err)
2927 err = xfrm_mark_put(skb, &xp->mark);
2928 if (!err)
2929 err = xfrm_if_id_put(skb, xp->if_id);
2930 if (err) {
2931 nlmsg_cancel(skb, nlh);
2932 return err;
2933 }
2934
2935 nlmsg_end(skb, nlh);
2936 return 0;
2937 }
2938
2939 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2940 struct xfrm_policy *xp)
2941 {
2942 struct net *net = xs_net(x);
2943 struct sk_buff *skb;
2944 int err;
2945
2946 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2947 if (skb == NULL)
2948 return -ENOMEM;
2949
2950 err = build_acquire(skb, x, xt, xp);
2951 BUG_ON(err < 0);
2952
2953 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2954 }
2955
2956 /* User gives us xfrm_user_policy_info followed by an array of 0
2957 * or more templates.
2958 */
2959 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2960 u8 *data, int len, int *dir)
2961 {
2962 struct net *net = sock_net(sk);
2963 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2964 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2965 struct xfrm_policy *xp;
2966 int nr;
2967
2968 switch (sk->sk_family) {
2969 case AF_INET:
2970 if (opt != IP_XFRM_POLICY) {
2971 *dir = -EOPNOTSUPP;
2972 return NULL;
2973 }
2974 break;
2975 #if IS_ENABLED(CONFIG_IPV6)
2976 case AF_INET6:
2977 if (opt != IPV6_XFRM_POLICY) {
2978 *dir = -EOPNOTSUPP;
2979 return NULL;
2980 }
2981 break;
2982 #endif
2983 default:
2984 *dir = -EINVAL;
2985 return NULL;
2986 }
2987
2988 *dir = -EINVAL;
2989
2990 if (len < sizeof(*p) ||
2991 verify_newpolicy_info(p))
2992 return NULL;
2993
2994 nr = ((len - sizeof(*p)) / sizeof(*ut));
2995 if (validate_tmpl(nr, ut, p->sel.family))
2996 return NULL;
2997
2998 if (p->dir > XFRM_POLICY_OUT)
2999 return NULL;
3000
3001 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3002 if (xp == NULL) {
3003 *dir = -ENOBUFS;
3004 return NULL;
3005 }
3006
3007 copy_from_user_policy(xp, p);
3008 xp->type = XFRM_POLICY_TYPE_MAIN;
3009 copy_templates(xp, ut, nr);
3010
3011 *dir = p->dir;
3012
3013 return xp;
3014 }
3015
3016 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3017 {
3018 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3019 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3020 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3021 + nla_total_size(sizeof(struct xfrm_mark))
3022 + userpolicy_type_attrsize();
3023 }
3024
3025 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3026 int dir, const struct km_event *c)
3027 {
3028 struct xfrm_user_polexpire *upe;
3029 int hard = c->data.hard;
3030 struct nlmsghdr *nlh;
3031 int err;
3032
3033 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3034 if (nlh == NULL)
3035 return -EMSGSIZE;
3036
3037 upe = nlmsg_data(nlh);
3038 copy_to_user_policy(xp, &upe->pol, dir);
3039 err = copy_to_user_tmpl(xp, skb);
3040 if (!err)
3041 err = copy_to_user_sec_ctx(xp, skb);
3042 if (!err)
3043 err = copy_to_user_policy_type(xp->type, skb);
3044 if (!err)
3045 err = xfrm_mark_put(skb, &xp->mark);
3046 if (!err)
3047 err = xfrm_if_id_put(skb, xp->if_id);
3048 if (err) {
3049 nlmsg_cancel(skb, nlh);
3050 return err;
3051 }
3052 upe->hard = !!hard;
3053
3054 nlmsg_end(skb, nlh);
3055 return 0;
3056 }
3057
3058 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3059 {
3060 struct net *net = xp_net(xp);
3061 struct sk_buff *skb;
3062 int err;
3063
3064 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3065 if (skb == NULL)
3066 return -ENOMEM;
3067
3068 err = build_polexpire(skb, xp, dir, c);
3069 BUG_ON(err < 0);
3070
3071 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3072 }
3073
3074 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3075 {
3076 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3077 struct net *net = xp_net(xp);
3078 struct xfrm_userpolicy_info *p;
3079 struct xfrm_userpolicy_id *id;
3080 struct nlmsghdr *nlh;
3081 struct sk_buff *skb;
3082 unsigned int headlen;
3083 int err;
3084
3085 headlen = sizeof(*p);
3086 if (c->event == XFRM_MSG_DELPOLICY) {
3087 len += nla_total_size(headlen);
3088 headlen = sizeof(*id);
3089 }
3090 len += userpolicy_type_attrsize();
3091 len += nla_total_size(sizeof(struct xfrm_mark));
3092 len += NLMSG_ALIGN(headlen);
3093
3094 skb = nlmsg_new(len, GFP_ATOMIC);
3095 if (skb == NULL)
3096 return -ENOMEM;
3097
3098 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3099 err = -EMSGSIZE;
3100 if (nlh == NULL)
3101 goto out_free_skb;
3102
3103 p = nlmsg_data(nlh);
3104 if (c->event == XFRM_MSG_DELPOLICY) {
3105 struct nlattr *attr;
3106
3107 id = nlmsg_data(nlh);
3108 memset(id, 0, sizeof(*id));
3109 id->dir = dir;
3110 if (c->data.byid)
3111 id->index = xp->index;
3112 else
3113 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3114
3115 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3116 err = -EMSGSIZE;
3117 if (attr == NULL)
3118 goto out_free_skb;
3119
3120 p = nla_data(attr);
3121 }
3122
3123 copy_to_user_policy(xp, p, dir);
3124 err = copy_to_user_tmpl(xp, skb);
3125 if (!err)
3126 err = copy_to_user_policy_type(xp->type, skb);
3127 if (!err)
3128 err = xfrm_mark_put(skb, &xp->mark);
3129 if (!err)
3130 err = xfrm_if_id_put(skb, xp->if_id);
3131 if (err)
3132 goto out_free_skb;
3133
3134 nlmsg_end(skb, nlh);
3135
3136 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3137
3138 out_free_skb:
3139 kfree_skb(skb);
3140 return err;
3141 }
3142
3143 static int xfrm_notify_policy_flush(const struct km_event *c)
3144 {
3145 struct net *net = c->net;
3146 struct nlmsghdr *nlh;
3147 struct sk_buff *skb;
3148 int err;
3149
3150 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3151 if (skb == NULL)
3152 return -ENOMEM;
3153
3154 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3155 err = -EMSGSIZE;
3156 if (nlh == NULL)
3157 goto out_free_skb;
3158 err = copy_to_user_policy_type(c->data.type, skb);
3159 if (err)
3160 goto out_free_skb;
3161
3162 nlmsg_end(skb, nlh);
3163
3164 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3165
3166 out_free_skb:
3167 kfree_skb(skb);
3168 return err;
3169 }
3170
3171 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3172 {
3173
3174 switch (c->event) {
3175 case XFRM_MSG_NEWPOLICY:
3176 case XFRM_MSG_UPDPOLICY:
3177 case XFRM_MSG_DELPOLICY:
3178 return xfrm_notify_policy(xp, dir, c);
3179 case XFRM_MSG_FLUSHPOLICY:
3180 return xfrm_notify_policy_flush(c);
3181 case XFRM_MSG_POLEXPIRE:
3182 return xfrm_exp_policy_notify(xp, dir, c);
3183 default:
3184 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3185 c->event);
3186 }
3187
3188 return 0;
3189
3190 }
3191
3192 static inline unsigned int xfrm_report_msgsize(void)
3193 {
3194 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3195 }
3196
3197 static int build_report(struct sk_buff *skb, u8 proto,
3198 struct xfrm_selector *sel, xfrm_address_t *addr)
3199 {
3200 struct xfrm_user_report *ur;
3201 struct nlmsghdr *nlh;
3202
3203 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3204 if (nlh == NULL)
3205 return -EMSGSIZE;
3206
3207 ur = nlmsg_data(nlh);
3208 ur->proto = proto;
3209 memcpy(&ur->sel, sel, sizeof(ur->sel));
3210
3211 if (addr) {
3212 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3213 if (err) {
3214 nlmsg_cancel(skb, nlh);
3215 return err;
3216 }
3217 }
3218 nlmsg_end(skb, nlh);
3219 return 0;
3220 }
3221
3222 static int xfrm_send_report(struct net *net, u8 proto,
3223 struct xfrm_selector *sel, xfrm_address_t *addr)
3224 {
3225 struct sk_buff *skb;
3226 int err;
3227
3228 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3229 if (skb == NULL)
3230 return -ENOMEM;
3231
3232 err = build_report(skb, proto, sel, addr);
3233 BUG_ON(err < 0);
3234
3235 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3236 }
3237
3238 static inline unsigned int xfrm_mapping_msgsize(void)
3239 {
3240 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3241 }
3242
3243 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3244 xfrm_address_t *new_saddr, __be16 new_sport)
3245 {
3246 struct xfrm_user_mapping *um;
3247 struct nlmsghdr *nlh;
3248
3249 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3250 if (nlh == NULL)
3251 return -EMSGSIZE;
3252
3253 um = nlmsg_data(nlh);
3254
3255 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3256 um->id.spi = x->id.spi;
3257 um->id.family = x->props.family;
3258 um->id.proto = x->id.proto;
3259 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3260 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3261 um->new_sport = new_sport;
3262 um->old_sport = x->encap->encap_sport;
3263 um->reqid = x->props.reqid;
3264
3265 nlmsg_end(skb, nlh);
3266 return 0;
3267 }
3268
3269 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3270 __be16 sport)
3271 {
3272 struct net *net = xs_net(x);
3273 struct sk_buff *skb;
3274 int err;
3275
3276 if (x->id.proto != IPPROTO_ESP)
3277 return -EINVAL;
3278
3279 if (!x->encap)
3280 return -EINVAL;
3281
3282 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3283 if (skb == NULL)
3284 return -ENOMEM;
3285
3286 err = build_mapping(skb, x, ipaddr, sport);
3287 BUG_ON(err < 0);
3288
3289 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3290 }
3291
3292 static bool xfrm_is_alive(const struct km_event *c)
3293 {
3294 return (bool)xfrm_acquire_is_on(c->net);
3295 }
3296
3297 static struct xfrm_mgr netlink_mgr = {
3298 .notify = xfrm_send_state_notify,
3299 .acquire = xfrm_send_acquire,
3300 .compile_policy = xfrm_compile_policy,
3301 .notify_policy = xfrm_send_policy_notify,
3302 .report = xfrm_send_report,
3303 .migrate = xfrm_send_migrate,
3304 .new_mapping = xfrm_send_mapping,
3305 .is_alive = xfrm_is_alive,
3306 };
3307
3308 static int __net_init xfrm_user_net_init(struct net *net)
3309 {
3310 struct sock *nlsk;
3311 struct netlink_kernel_cfg cfg = {
3312 .groups = XFRMNLGRP_MAX,
3313 .input = xfrm_netlink_rcv,
3314 };
3315
3316 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3317 if (nlsk == NULL)
3318 return -ENOMEM;
3319 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3320 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3321 return 0;
3322 }
3323
3324 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3325 {
3326 struct net *net;
3327 list_for_each_entry(net, net_exit_list, exit_list)
3328 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3329 synchronize_net();
3330 list_for_each_entry(net, net_exit_list, exit_list)
3331 netlink_kernel_release(net->xfrm.nlsk_stash);
3332 }
3333
3334 static struct pernet_operations xfrm_user_net_ops = {
3335 .init = xfrm_user_net_init,
3336 .exit_batch = xfrm_user_net_exit,
3337 };
3338
3339 static int __init xfrm_user_init(void)
3340 {
3341 int rv;
3342
3343 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3344
3345 rv = register_pernet_subsys(&xfrm_user_net_ops);
3346 if (rv < 0)
3347 return rv;
3348 rv = xfrm_register_km(&netlink_mgr);
3349 if (rv < 0)
3350 unregister_pernet_subsys(&xfrm_user_net_ops);
3351 return rv;
3352 }
3353
3354 static void __exit xfrm_user_exit(void)
3355 {
3356 xfrm_unregister_km(&netlink_mgr);
3357 unregister_pernet_subsys(&xfrm_user_net_ops);
3358 }
3359
3360 module_init(xfrm_user_init);
3361 module_exit(xfrm_user_exit);
3362 MODULE_LICENSE("GPL");
3363 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
Mirror of linux-2.6-arm at arm.linux.org.uk