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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blobb88ba45ff1ace6ff986cf214c9fd8d1b8730261d
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 break;
156
157 case AF_INET6:
158 #if IS_ENABLED(CONFIG_IPV6)
159 break;
160 #else
161 err = -EAFNOSUPPORT;
162 goto out;
163 #endif
164
165 default:
166 goto out;
167 }
168
169 switch (p->sel.family) {
170 case AF_UNSPEC:
171 break;
172
173 case AF_INET:
174 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
175 goto out;
176
177 break;
178
179 case AF_INET6:
180 #if IS_ENABLED(CONFIG_IPV6)
181 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
182 goto out;
183
184 break;
185 #else
186 err = -EAFNOSUPPORT;
187 goto out;
188 #endif
189
190 default:
191 goto out;
192 }
193
194 err = -EINVAL;
195 switch (p->id.proto) {
196 case IPPROTO_AH:
197 if ((!attrs[XFRMA_ALG_AUTH] &&
198 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
199 attrs[XFRMA_ALG_AEAD] ||
200 attrs[XFRMA_ALG_CRYPT] ||
201 attrs[XFRMA_ALG_COMP] ||
202 attrs[XFRMA_TFCPAD])
203 goto out;
204 break;
205
206 case IPPROTO_ESP:
207 if (attrs[XFRMA_ALG_COMP])
208 goto out;
209 if (!attrs[XFRMA_ALG_AUTH] &&
210 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
211 !attrs[XFRMA_ALG_CRYPT] &&
212 !attrs[XFRMA_ALG_AEAD])
213 goto out;
214 if ((attrs[XFRMA_ALG_AUTH] ||
215 attrs[XFRMA_ALG_AUTH_TRUNC] ||
216 attrs[XFRMA_ALG_CRYPT]) &&
217 attrs[XFRMA_ALG_AEAD])
218 goto out;
219 if (attrs[XFRMA_TFCPAD] &&
220 p->mode != XFRM_MODE_TUNNEL)
221 goto out;
222 break;
223
224 case IPPROTO_COMP:
225 if (!attrs[XFRMA_ALG_COMP] ||
226 attrs[XFRMA_ALG_AEAD] ||
227 attrs[XFRMA_ALG_AUTH] ||
228 attrs[XFRMA_ALG_AUTH_TRUNC] ||
229 attrs[XFRMA_ALG_CRYPT] ||
230 attrs[XFRMA_TFCPAD] ||
231 (ntohl(p->id.spi) >= 0x10000))
232 goto out;
233 break;
234
235 #if IS_ENABLED(CONFIG_IPV6)
236 case IPPROTO_DSTOPTS:
237 case IPPROTO_ROUTING:
238 if (attrs[XFRMA_ALG_COMP] ||
239 attrs[XFRMA_ALG_AUTH] ||
240 attrs[XFRMA_ALG_AUTH_TRUNC] ||
241 attrs[XFRMA_ALG_AEAD] ||
242 attrs[XFRMA_ALG_CRYPT] ||
243 attrs[XFRMA_ENCAP] ||
244 attrs[XFRMA_SEC_CTX] ||
245 attrs[XFRMA_TFCPAD] ||
246 !attrs[XFRMA_COADDR])
247 goto out;
248 break;
249 #endif
250
251 default:
252 goto out;
253 }
254
255 if ((err = verify_aead(attrs)))
256 goto out;
257 if ((err = verify_auth_trunc(attrs)))
258 goto out;
259 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
260 goto out;
261 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
262 goto out;
263 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
264 goto out;
265 if ((err = verify_sec_ctx_len(attrs)))
266 goto out;
267 if ((err = verify_replay(p, attrs)))
268 goto out;
269
270 err = -EINVAL;
271 switch (p->mode) {
272 case XFRM_MODE_TRANSPORT:
273 case XFRM_MODE_TUNNEL:
274 case XFRM_MODE_ROUTEOPTIMIZATION:
275 case XFRM_MODE_BEET:
276 break;
277
278 default:
279 goto out;
280 }
281
282 err = 0;
283
284 out:
285 return err;
286 }
287
288 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
289 struct xfrm_algo_desc *(*get_byname)(const char *, int),
290 struct nlattr *rta)
291 {
292 struct xfrm_algo *p, *ualg;
293 struct xfrm_algo_desc *algo;
294
295 if (!rta)
296 return 0;
297
298 ualg = nla_data(rta);
299
300 algo = get_byname(ualg->alg_name, 1);
301 if (!algo)
302 return -ENOSYS;
303 *props = algo->desc.sadb_alg_id;
304
305 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
306 if (!p)
307 return -ENOMEM;
308
309 strcpy(p->alg_name, algo->name);
310 *algpp = p;
311 return 0;
312 }
313
314 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
315 {
316 struct xfrm_algo *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 x->props.ealgo = algo->desc.sadb_alg_id;
328
329 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
330 if (!p)
331 return -ENOMEM;
332
333 strcpy(p->alg_name, algo->name);
334 x->ealg = p;
335 x->geniv = algo->uinfo.encr.geniv;
336 return 0;
337 }
338
339 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
340 struct nlattr *rta)
341 {
342 struct xfrm_algo *ualg;
343 struct xfrm_algo_auth *p;
344 struct xfrm_algo_desc *algo;
345
346 if (!rta)
347 return 0;
348
349 ualg = nla_data(rta);
350
351 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
352 if (!algo)
353 return -ENOSYS;
354 *props = algo->desc.sadb_alg_id;
355
356 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
357 if (!p)
358 return -ENOMEM;
359
360 strcpy(p->alg_name, algo->name);
361 p->alg_key_len = ualg->alg_key_len;
362 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
363 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
364
365 *algpp = p;
366 return 0;
367 }
368
369 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
370 struct nlattr *rta)
371 {
372 struct xfrm_algo_auth *p, *ualg;
373 struct xfrm_algo_desc *algo;
374
375 if (!rta)
376 return 0;
377
378 ualg = nla_data(rta);
379
380 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
381 if (!algo)
382 return -ENOSYS;
383 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
384 return -EINVAL;
385 *props = algo->desc.sadb_alg_id;
386
387 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
388 if (!p)
389 return -ENOMEM;
390
391 strcpy(p->alg_name, algo->name);
392 if (!p->alg_trunc_len)
393 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
394
395 *algpp = p;
396 return 0;
397 }
398
399 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
400 {
401 struct xfrm_algo_aead *p, *ualg;
402 struct xfrm_algo_desc *algo;
403
404 if (!rta)
405 return 0;
406
407 ualg = nla_data(rta);
408
409 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
410 if (!algo)
411 return -ENOSYS;
412 x->props.ealgo = algo->desc.sadb_alg_id;
413
414 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
415 if (!p)
416 return -ENOMEM;
417
418 strcpy(p->alg_name, algo->name);
419 x->aead = p;
420 x->geniv = algo->uinfo.aead.geniv;
421 return 0;
422 }
423
424 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
425 struct nlattr *rp)
426 {
427 struct xfrm_replay_state_esn *up;
428 unsigned int ulen;
429
430 if (!replay_esn || !rp)
431 return 0;
432
433 up = nla_data(rp);
434 ulen = xfrm_replay_state_esn_len(up);
435
436 /* Check the overall length and the internal bitmap length to avoid
437 * potential overflow. */
438 if (nla_len(rp) < (int)ulen ||
439 xfrm_replay_state_esn_len(replay_esn) != ulen ||
440 replay_esn->bmp_len != up->bmp_len)
441 return -EINVAL;
442
443 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
444 return -EINVAL;
445
446 return 0;
447 }
448
449 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
450 struct xfrm_replay_state_esn **preplay_esn,
451 struct nlattr *rta)
452 {
453 struct xfrm_replay_state_esn *p, *pp, *up;
454 unsigned int klen, ulen;
455
456 if (!rta)
457 return 0;
458
459 up = nla_data(rta);
460 klen = xfrm_replay_state_esn_len(up);
461 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
462
463 p = kzalloc(klen, GFP_KERNEL);
464 if (!p)
465 return -ENOMEM;
466
467 pp = kzalloc(klen, GFP_KERNEL);
468 if (!pp) {
469 kfree(p);
470 return -ENOMEM;
471 }
472
473 memcpy(p, up, ulen);
474 memcpy(pp, up, ulen);
475
476 *replay_esn = p;
477 *preplay_esn = pp;
478
479 return 0;
480 }
481
482 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
483 {
484 unsigned int len = 0;
485
486 if (xfrm_ctx) {
487 len += sizeof(struct xfrm_user_sec_ctx);
488 len += xfrm_ctx->ctx_len;
489 }
490 return len;
491 }
492
493 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
494 {
495 memcpy(&x->id, &p->id, sizeof(x->id));
496 memcpy(&x->sel, &p->sel, sizeof(x->sel));
497 memcpy(&x->lft, &p->lft, sizeof(x->lft));
498 x->props.mode = p->mode;
499 x->props.replay_window = min_t(unsigned int, p->replay_window,
500 sizeof(x->replay.bitmap) * 8);
501 x->props.reqid = p->reqid;
502 x->props.family = p->family;
503 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
504 x->props.flags = p->flags;
505
506 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
507 x->sel.family = p->family;
508 }
509
510 /*
511 * someday when pfkey also has support, we could have the code
512 * somehow made shareable and move it to xfrm_state.c - JHS
513 *
514 */
515 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
516 int update_esn)
517 {
518 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
519 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
520 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
521 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
522 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
523
524 if (re) {
525 struct xfrm_replay_state_esn *replay_esn;
526 replay_esn = nla_data(re);
527 memcpy(x->replay_esn, replay_esn,
528 xfrm_replay_state_esn_len(replay_esn));
529 memcpy(x->preplay_esn, replay_esn,
530 xfrm_replay_state_esn_len(replay_esn));
531 }
532
533 if (rp) {
534 struct xfrm_replay_state *replay;
535 replay = nla_data(rp);
536 memcpy(&x->replay, replay, sizeof(*replay));
537 memcpy(&x->preplay, replay, sizeof(*replay));
538 }
539
540 if (lt) {
541 struct xfrm_lifetime_cur *ltime;
542 ltime = nla_data(lt);
543 x->curlft.bytes = ltime->bytes;
544 x->curlft.packets = ltime->packets;
545 x->curlft.add_time = ltime->add_time;
546 x->curlft.use_time = ltime->use_time;
547 }
548
549 if (et)
550 x->replay_maxage = nla_get_u32(et);
551
552 if (rt)
553 x->replay_maxdiff = nla_get_u32(rt);
554 }
555
556 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
557 {
558 if (attrs[XFRMA_SET_MARK]) {
559 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
560 if (attrs[XFRMA_SET_MARK_MASK])
561 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
562 else
563 m->m = 0xffffffff;
564 } else {
565 m->v = m->m = 0;
566 }
567 }
568
569 static struct xfrm_state *xfrm_state_construct(struct net *net,
570 struct xfrm_usersa_info *p,
571 struct nlattr **attrs,
572 int *errp)
573 {
574 struct xfrm_state *x = xfrm_state_alloc(net);
575 int err = -ENOMEM;
576
577 if (!x)
578 goto error_no_put;
579
580 copy_from_user_state(x, p);
581
582 if (attrs[XFRMA_SA_EXTRA_FLAGS])
583 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
584
585 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
586 goto error;
587 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
588 attrs[XFRMA_ALG_AUTH_TRUNC])))
589 goto error;
590 if (!x->props.aalgo) {
591 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
592 attrs[XFRMA_ALG_AUTH])))
593 goto error;
594 }
595 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
596 goto error;
597 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
598 xfrm_calg_get_byname,
599 attrs[XFRMA_ALG_COMP])))
600 goto error;
601
602 if (attrs[XFRMA_ENCAP]) {
603 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
604 sizeof(*x->encap), GFP_KERNEL);
605 if (x->encap == NULL)
606 goto error;
607 }
608
609 if (attrs[XFRMA_TFCPAD])
610 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
611
612 if (attrs[XFRMA_COADDR]) {
613 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
614 sizeof(*x->coaddr), GFP_KERNEL);
615 if (x->coaddr == NULL)
616 goto error;
617 }
618
619 xfrm_mark_get(attrs, &x->mark);
620
621 xfrm_smark_init(attrs, &x->props.smark);
622
623 if (attrs[XFRMA_IF_ID])
624 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
625
626 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
627 if (err)
628 goto error;
629
630 if (attrs[XFRMA_SEC_CTX]) {
631 err = security_xfrm_state_alloc(x,
632 nla_data(attrs[XFRMA_SEC_CTX]));
633 if (err)
634 goto error;
635 }
636
637 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
638 attrs[XFRMA_REPLAY_ESN_VAL])))
639 goto error;
640
641 x->km.seq = p->seq;
642 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
643 /* sysctl_xfrm_aevent_etime is in 100ms units */
644 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
645
646 if ((err = xfrm_init_replay(x)))
647 goto error;
648
649 /* override default values from above */
650 xfrm_update_ae_params(x, attrs, 0);
651
652 /* configure the hardware if offload is requested */
653 if (attrs[XFRMA_OFFLOAD_DEV]) {
654 err = xfrm_dev_state_add(net, x,
655 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
656 if (err)
657 goto error;
658 }
659
660 return x;
661
662 error:
663 x->km.state = XFRM_STATE_DEAD;
664 xfrm_state_put(x);
665 error_no_put:
666 *errp = err;
667 return NULL;
668 }
669
670 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
671 struct nlattr **attrs)
672 {
673 struct net *net = sock_net(skb->sk);
674 struct xfrm_usersa_info *p = nlmsg_data(nlh);
675 struct xfrm_state *x;
676 int err;
677 struct km_event c;
678
679 err = verify_newsa_info(p, attrs);
680 if (err)
681 return err;
682
683 x = xfrm_state_construct(net, p, attrs, &err);
684 if (!x)
685 return err;
686
687 xfrm_state_hold(x);
688 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
689 err = xfrm_state_add(x);
690 else
691 err = xfrm_state_update(x);
692
693 xfrm_audit_state_add(x, err ? 0 : 1, true);
694
695 if (err < 0) {
696 x->km.state = XFRM_STATE_DEAD;
697 xfrm_dev_state_delete(x);
698 __xfrm_state_put(x);
699 goto out;
700 }
701
702 if (x->km.state == XFRM_STATE_VOID)
703 x->km.state = XFRM_STATE_VALID;
704
705 c.seq = nlh->nlmsg_seq;
706 c.portid = nlh->nlmsg_pid;
707 c.event = nlh->nlmsg_type;
708
709 km_state_notify(x, &c);
710 out:
711 xfrm_state_put(x);
712 return err;
713 }
714
715 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
716 struct xfrm_usersa_id *p,
717 struct nlattr **attrs,
718 int *errp)
719 {
720 struct xfrm_state *x = NULL;
721 struct xfrm_mark m;
722 int err;
723 u32 mark = xfrm_mark_get(attrs, &m);
724
725 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
726 err = -ESRCH;
727 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
728 } else {
729 xfrm_address_t *saddr = NULL;
730
731 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
732 if (!saddr) {
733 err = -EINVAL;
734 goto out;
735 }
736
737 err = -ESRCH;
738 x = xfrm_state_lookup_byaddr(net, mark,
739 &p->daddr, saddr,
740 p->proto, p->family);
741 }
742
743 out:
744 if (!x && errp)
745 *errp = err;
746 return x;
747 }
748
749 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
750 struct nlattr **attrs)
751 {
752 struct net *net = sock_net(skb->sk);
753 struct xfrm_state *x;
754 int err = -ESRCH;
755 struct km_event c;
756 struct xfrm_usersa_id *p = nlmsg_data(nlh);
757
758 x = xfrm_user_state_lookup(net, p, attrs, &err);
759 if (x == NULL)
760 return err;
761
762 if ((err = security_xfrm_state_delete(x)) != 0)
763 goto out;
764
765 if (xfrm_state_kern(x)) {
766 err = -EPERM;
767 goto out;
768 }
769
770 err = xfrm_state_delete(x);
771
772 if (err < 0)
773 goto out;
774
775 c.seq = nlh->nlmsg_seq;
776 c.portid = nlh->nlmsg_pid;
777 c.event = nlh->nlmsg_type;
778 km_state_notify(x, &c);
779
780 out:
781 xfrm_audit_state_delete(x, err ? 0 : 1, true);
782 xfrm_state_put(x);
783 return err;
784 }
785
786 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
787 {
788 memset(p, 0, sizeof(*p));
789 memcpy(&p->id, &x->id, sizeof(p->id));
790 memcpy(&p->sel, &x->sel, sizeof(p->sel));
791 memcpy(&p->lft, &x->lft, sizeof(p->lft));
792 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
793 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
794 put_unaligned(x->stats.replay, &p->stats.replay);
795 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
796 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
797 p->mode = x->props.mode;
798 p->replay_window = x->props.replay_window;
799 p->reqid = x->props.reqid;
800 p->family = x->props.family;
801 p->flags = x->props.flags;
802 p->seq = x->km.seq;
803 }
804
805 struct xfrm_dump_info {
806 struct sk_buff *in_skb;
807 struct sk_buff *out_skb;
808 u32 nlmsg_seq;
809 u16 nlmsg_flags;
810 };
811
812 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
813 {
814 struct xfrm_user_sec_ctx *uctx;
815 struct nlattr *attr;
816 int ctx_size = sizeof(*uctx) + s->ctx_len;
817
818 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
819 if (attr == NULL)
820 return -EMSGSIZE;
821
822 uctx = nla_data(attr);
823 uctx->exttype = XFRMA_SEC_CTX;
824 uctx->len = ctx_size;
825 uctx->ctx_doi = s->ctx_doi;
826 uctx->ctx_alg = s->ctx_alg;
827 uctx->ctx_len = s->ctx_len;
828 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
829
830 return 0;
831 }
832
833 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
834 {
835 struct xfrm_user_offload *xuo;
836 struct nlattr *attr;
837
838 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
839 if (attr == NULL)
840 return -EMSGSIZE;
841
842 xuo = nla_data(attr);
843 memset(xuo, 0, sizeof(*xuo));
844 xuo->ifindex = xso->dev->ifindex;
845 xuo->flags = xso->flags;
846
847 return 0;
848 }
849
850 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
851 {
852 struct xfrm_algo *algo;
853 struct nlattr *nla;
854
855 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
856 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
857 if (!nla)
858 return -EMSGSIZE;
859
860 algo = nla_data(nla);
861 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
862 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
863 algo->alg_key_len = auth->alg_key_len;
864
865 return 0;
866 }
867
868 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
869 {
870 int ret = 0;
871
872 if (m->v | m->m) {
873 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
874 if (!ret)
875 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
876 }
877 return ret;
878 }
879
880 /* Don't change this without updating xfrm_sa_len! */
881 static int copy_to_user_state_extra(struct xfrm_state *x,
882 struct xfrm_usersa_info *p,
883 struct sk_buff *skb)
884 {
885 int ret = 0;
886
887 copy_to_user_state(x, p);
888
889 if (x->props.extra_flags) {
890 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
891 x->props.extra_flags);
892 if (ret)
893 goto out;
894 }
895
896 if (x->coaddr) {
897 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
898 if (ret)
899 goto out;
900 }
901 if (x->lastused) {
902 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
903 XFRMA_PAD);
904 if (ret)
905 goto out;
906 }
907 if (x->aead) {
908 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
909 if (ret)
910 goto out;
911 }
912 if (x->aalg) {
913 ret = copy_to_user_auth(x->aalg, skb);
914 if (!ret)
915 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
916 xfrm_alg_auth_len(x->aalg), x->aalg);
917 if (ret)
918 goto out;
919 }
920 if (x->ealg) {
921 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
922 if (ret)
923 goto out;
924 }
925 if (x->calg) {
926 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
927 if (ret)
928 goto out;
929 }
930 if (x->encap) {
931 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
932 if (ret)
933 goto out;
934 }
935 if (x->tfcpad) {
936 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
937 if (ret)
938 goto out;
939 }
940 ret = xfrm_mark_put(skb, &x->mark);
941 if (ret)
942 goto out;
943
944 ret = xfrm_smark_put(skb, &x->props.smark);
945 if (ret)
946 goto out;
947
948 if (x->replay_esn)
949 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
950 xfrm_replay_state_esn_len(x->replay_esn),
951 x->replay_esn);
952 else
953 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
954 &x->replay);
955 if (ret)
956 goto out;
957 if(x->xso.dev)
958 ret = copy_user_offload(&x->xso, skb);
959 if (ret)
960 goto out;
961 if (x->if_id) {
962 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
963 if (ret)
964 goto out;
965 }
966 if (x->security)
967 ret = copy_sec_ctx(x->security, skb);
968 out:
969 return ret;
970 }
971
972 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
973 {
974 struct xfrm_dump_info *sp = ptr;
975 struct sk_buff *in_skb = sp->in_skb;
976 struct sk_buff *skb = sp->out_skb;
977 struct xfrm_usersa_info *p;
978 struct nlmsghdr *nlh;
979 int err;
980
981 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
982 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
983 if (nlh == NULL)
984 return -EMSGSIZE;
985
986 p = nlmsg_data(nlh);
987
988 err = copy_to_user_state_extra(x, p, skb);
989 if (err) {
990 nlmsg_cancel(skb, nlh);
991 return err;
992 }
993 nlmsg_end(skb, nlh);
994 return 0;
995 }
996
997 static int xfrm_dump_sa_done(struct netlink_callback *cb)
998 {
999 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1000 struct sock *sk = cb->skb->sk;
1001 struct net *net = sock_net(sk);
1002
1003 if (cb->args[0])
1004 xfrm_state_walk_done(walk, net);
1005 return 0;
1006 }
1007
1008 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1009 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1010 {
1011 struct net *net = sock_net(skb->sk);
1012 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1013 struct xfrm_dump_info info;
1014
1015 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1016 sizeof(cb->args) - sizeof(cb->args[0]));
1017
1018 info.in_skb = cb->skb;
1019 info.out_skb = skb;
1020 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1021 info.nlmsg_flags = NLM_F_MULTI;
1022
1023 if (!cb->args[0]) {
1024 struct nlattr *attrs[XFRMA_MAX+1];
1025 struct xfrm_address_filter *filter = NULL;
1026 u8 proto = 0;
1027 int err;
1028
1029 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1030 xfrma_policy, cb->extack);
1031 if (err < 0)
1032 return err;
1033
1034 if (attrs[XFRMA_ADDRESS_FILTER]) {
1035 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1036 sizeof(*filter), GFP_KERNEL);
1037 if (filter == NULL)
1038 return -ENOMEM;
1039 }
1040
1041 if (attrs[XFRMA_PROTO])
1042 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1043
1044 xfrm_state_walk_init(walk, proto, filter);
1045 cb->args[0] = 1;
1046 }
1047
1048 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1049
1050 return skb->len;
1051 }
1052
1053 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1054 struct xfrm_state *x, u32 seq)
1055 {
1056 struct xfrm_dump_info info;
1057 struct sk_buff *skb;
1058 int err;
1059
1060 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1061 if (!skb)
1062 return ERR_PTR(-ENOMEM);
1063
1064 info.in_skb = in_skb;
1065 info.out_skb = skb;
1066 info.nlmsg_seq = seq;
1067 info.nlmsg_flags = 0;
1068
1069 err = dump_one_state(x, 0, &info);
1070 if (err) {
1071 kfree_skb(skb);
1072 return ERR_PTR(err);
1073 }
1074
1075 return skb;
1076 }
1077
1078 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1079 * Must be called with RCU read lock.
1080 */
1081 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1082 u32 pid, unsigned int group)
1083 {
1084 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1085
1086 if (!nlsk) {
1087 kfree_skb(skb);
1088 return -EPIPE;
1089 }
1090
1091 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1092 }
1093
1094 static inline unsigned int xfrm_spdinfo_msgsize(void)
1095 {
1096 return NLMSG_ALIGN(4)
1097 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1098 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1099 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1100 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1101 }
1102
1103 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1104 u32 portid, u32 seq, u32 flags)
1105 {
1106 struct xfrmk_spdinfo si;
1107 struct xfrmu_spdinfo spc;
1108 struct xfrmu_spdhinfo sph;
1109 struct xfrmu_spdhthresh spt4, spt6;
1110 struct nlmsghdr *nlh;
1111 int err;
1112 u32 *f;
1113 unsigned lseq;
1114
1115 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1116 if (nlh == NULL) /* shouldn't really happen ... */
1117 return -EMSGSIZE;
1118
1119 f = nlmsg_data(nlh);
1120 *f = flags;
1121 xfrm_spd_getinfo(net, &si);
1122 spc.incnt = si.incnt;
1123 spc.outcnt = si.outcnt;
1124 spc.fwdcnt = si.fwdcnt;
1125 spc.inscnt = si.inscnt;
1126 spc.outscnt = si.outscnt;
1127 spc.fwdscnt = si.fwdscnt;
1128 sph.spdhcnt = si.spdhcnt;
1129 sph.spdhmcnt = si.spdhmcnt;
1130
1131 do {
1132 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1133
1134 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1135 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1136 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1137 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1138 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1139
1140 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1141 if (!err)
1142 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1143 if (!err)
1144 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1145 if (!err)
1146 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1147 if (err) {
1148 nlmsg_cancel(skb, nlh);
1149 return err;
1150 }
1151
1152 nlmsg_end(skb, nlh);
1153 return 0;
1154 }
1155
1156 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1157 struct nlattr **attrs)
1158 {
1159 struct net *net = sock_net(skb->sk);
1160 struct xfrmu_spdhthresh *thresh4 = NULL;
1161 struct xfrmu_spdhthresh *thresh6 = NULL;
1162
1163 /* selector prefixlen thresholds to hash policies */
1164 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1165 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1166
1167 if (nla_len(rta) < sizeof(*thresh4))
1168 return -EINVAL;
1169 thresh4 = nla_data(rta);
1170 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1171 return -EINVAL;
1172 }
1173 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1174 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1175
1176 if (nla_len(rta) < sizeof(*thresh6))
1177 return -EINVAL;
1178 thresh6 = nla_data(rta);
1179 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1180 return -EINVAL;
1181 }
1182
1183 if (thresh4 || thresh6) {
1184 write_seqlock(&net->xfrm.policy_hthresh.lock);
1185 if (thresh4) {
1186 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1187 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1188 }
1189 if (thresh6) {
1190 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1191 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1192 }
1193 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1194
1195 xfrm_policy_hash_rebuild(net);
1196 }
1197
1198 return 0;
1199 }
1200
1201 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1202 struct nlattr **attrs)
1203 {
1204 struct net *net = sock_net(skb->sk);
1205 struct sk_buff *r_skb;
1206 u32 *flags = nlmsg_data(nlh);
1207 u32 sportid = NETLINK_CB(skb).portid;
1208 u32 seq = nlh->nlmsg_seq;
1209 int err;
1210
1211 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1212 if (r_skb == NULL)
1213 return -ENOMEM;
1214
1215 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1216 BUG_ON(err < 0);
1217
1218 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1219 }
1220
1221 static inline unsigned int xfrm_sadinfo_msgsize(void)
1222 {
1223 return NLMSG_ALIGN(4)
1224 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1225 + nla_total_size(4); /* XFRMA_SAD_CNT */
1226 }
1227
1228 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1229 u32 portid, u32 seq, u32 flags)
1230 {
1231 struct xfrmk_sadinfo si;
1232 struct xfrmu_sadhinfo sh;
1233 struct nlmsghdr *nlh;
1234 int err;
1235 u32 *f;
1236
1237 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1238 if (nlh == NULL) /* shouldn't really happen ... */
1239 return -EMSGSIZE;
1240
1241 f = nlmsg_data(nlh);
1242 *f = flags;
1243 xfrm_sad_getinfo(net, &si);
1244
1245 sh.sadhmcnt = si.sadhmcnt;
1246 sh.sadhcnt = si.sadhcnt;
1247
1248 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1249 if (!err)
1250 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1251 if (err) {
1252 nlmsg_cancel(skb, nlh);
1253 return err;
1254 }
1255
1256 nlmsg_end(skb, nlh);
1257 return 0;
1258 }
1259
1260 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1261 struct nlattr **attrs)
1262 {
1263 struct net *net = sock_net(skb->sk);
1264 struct sk_buff *r_skb;
1265 u32 *flags = nlmsg_data(nlh);
1266 u32 sportid = NETLINK_CB(skb).portid;
1267 u32 seq = nlh->nlmsg_seq;
1268 int err;
1269
1270 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1271 if (r_skb == NULL)
1272 return -ENOMEM;
1273
1274 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1275 BUG_ON(err < 0);
1276
1277 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1278 }
1279
1280 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1281 struct nlattr **attrs)
1282 {
1283 struct net *net = sock_net(skb->sk);
1284 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1285 struct xfrm_state *x;
1286 struct sk_buff *resp_skb;
1287 int err = -ESRCH;
1288
1289 x = xfrm_user_state_lookup(net, p, attrs, &err);
1290 if (x == NULL)
1291 goto out_noput;
1292
1293 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1294 if (IS_ERR(resp_skb)) {
1295 err = PTR_ERR(resp_skb);
1296 } else {
1297 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1298 }
1299 xfrm_state_put(x);
1300 out_noput:
1301 return err;
1302 }
1303
1304 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1305 struct nlattr **attrs)
1306 {
1307 struct net *net = sock_net(skb->sk);
1308 struct xfrm_state *x;
1309 struct xfrm_userspi_info *p;
1310 struct sk_buff *resp_skb;
1311 xfrm_address_t *daddr;
1312 int family;
1313 int err;
1314 u32 mark;
1315 struct xfrm_mark m;
1316 u32 if_id = 0;
1317
1318 p = nlmsg_data(nlh);
1319 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1320 if (err)
1321 goto out_noput;
1322
1323 family = p->info.family;
1324 daddr = &p->info.id.daddr;
1325
1326 x = NULL;
1327
1328 mark = xfrm_mark_get(attrs, &m);
1329
1330 if (attrs[XFRMA_IF_ID])
1331 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1332
1333 if (p->info.seq) {
1334 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1335 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1336 xfrm_state_put(x);
1337 x = NULL;
1338 }
1339 }
1340
1341 if (!x)
1342 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1343 if_id, p->info.id.proto, daddr,
1344 &p->info.saddr, 1,
1345 family);
1346 err = -ENOENT;
1347 if (x == NULL)
1348 goto out_noput;
1349
1350 err = xfrm_alloc_spi(x, p->min, p->max);
1351 if (err)
1352 goto out;
1353
1354 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1355 if (IS_ERR(resp_skb)) {
1356 err = PTR_ERR(resp_skb);
1357 goto out;
1358 }
1359
1360 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1361
1362 out:
1363 xfrm_state_put(x);
1364 out_noput:
1365 return err;
1366 }
1367
1368 static int verify_policy_dir(u8 dir)
1369 {
1370 switch (dir) {
1371 case XFRM_POLICY_IN:
1372 case XFRM_POLICY_OUT:
1373 case XFRM_POLICY_FWD:
1374 break;
1375
1376 default:
1377 return -EINVAL;
1378 }
1379
1380 return 0;
1381 }
1382
1383 static int verify_policy_type(u8 type)
1384 {
1385 switch (type) {
1386 case XFRM_POLICY_TYPE_MAIN:
1387 #ifdef CONFIG_XFRM_SUB_POLICY
1388 case XFRM_POLICY_TYPE_SUB:
1389 #endif
1390 break;
1391
1392 default:
1393 return -EINVAL;
1394 }
1395
1396 return 0;
1397 }
1398
1399 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1400 {
1401 int ret;
1402
1403 switch (p->share) {
1404 case XFRM_SHARE_ANY:
1405 case XFRM_SHARE_SESSION:
1406 case XFRM_SHARE_USER:
1407 case XFRM_SHARE_UNIQUE:
1408 break;
1409
1410 default:
1411 return -EINVAL;
1412 }
1413
1414 switch (p->action) {
1415 case XFRM_POLICY_ALLOW:
1416 case XFRM_POLICY_BLOCK:
1417 break;
1418
1419 default:
1420 return -EINVAL;
1421 }
1422
1423 switch (p->sel.family) {
1424 case AF_INET:
1425 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1426 return -EINVAL;
1427
1428 break;
1429
1430 case AF_INET6:
1431 #if IS_ENABLED(CONFIG_IPV6)
1432 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1433 return -EINVAL;
1434
1435 break;
1436 #else
1437 return -EAFNOSUPPORT;
1438 #endif
1439
1440 default:
1441 return -EINVAL;
1442 }
1443
1444 ret = verify_policy_dir(p->dir);
1445 if (ret)
1446 return ret;
1447 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1448 return -EINVAL;
1449
1450 return 0;
1451 }
1452
1453 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1454 {
1455 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1456 struct xfrm_user_sec_ctx *uctx;
1457
1458 if (!rt)
1459 return 0;
1460
1461 uctx = nla_data(rt);
1462 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1463 }
1464
1465 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1466 int nr)
1467 {
1468 int i;
1469
1470 xp->xfrm_nr = nr;
1471 for (i = 0; i < nr; i++, ut++) {
1472 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1473
1474 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1475 memcpy(&t->saddr, &ut->saddr,
1476 sizeof(xfrm_address_t));
1477 t->reqid = ut->reqid;
1478 t->mode = ut->mode;
1479 t->share = ut->share;
1480 t->optional = ut->optional;
1481 t->aalgos = ut->aalgos;
1482 t->ealgos = ut->ealgos;
1483 t->calgos = ut->calgos;
1484 /* If all masks are ~0, then we allow all algorithms. */
1485 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1486 t->encap_family = ut->family;
1487 }
1488 }
1489
1490 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1491 {
1492 u16 prev_family;
1493 int i;
1494
1495 if (nr > XFRM_MAX_DEPTH)
1496 return -EINVAL;
1497
1498 prev_family = family;
1499
1500 for (i = 0; i < nr; i++) {
1501 /* We never validated the ut->family value, so many
1502 * applications simply leave it at zero. The check was
1503 * never made and ut->family was ignored because all
1504 * templates could be assumed to have the same family as
1505 * the policy itself. Now that we will have ipv4-in-ipv6
1506 * and ipv6-in-ipv4 tunnels, this is no longer true.
1507 */
1508 if (!ut[i].family)
1509 ut[i].family = family;
1510
1511 switch (ut[i].mode) {
1512 case XFRM_MODE_TUNNEL:
1513 case XFRM_MODE_BEET:
1514 break;
1515 default:
1516 if (ut[i].family != prev_family)
1517 return -EINVAL;
1518 break;
1519 }
1520 if (ut[i].mode >= XFRM_MODE_MAX)
1521 return -EINVAL;
1522
1523 prev_family = ut[i].family;
1524
1525 switch (ut[i].family) {
1526 case AF_INET:
1527 break;
1528 #if IS_ENABLED(CONFIG_IPV6)
1529 case AF_INET6:
1530 break;
1531 #endif
1532 default:
1533 return -EINVAL;
1534 }
1535
1536 if (!xfrm_id_proto_valid(ut[i].id.proto))
1537 return -EINVAL;
1538 }
1539
1540 return 0;
1541 }
1542
1543 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1544 {
1545 struct nlattr *rt = attrs[XFRMA_TMPL];
1546
1547 if (!rt) {
1548 pol->xfrm_nr = 0;
1549 } else {
1550 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1551 int nr = nla_len(rt) / sizeof(*utmpl);
1552 int err;
1553
1554 err = validate_tmpl(nr, utmpl, pol->family);
1555 if (err)
1556 return err;
1557
1558 copy_templates(pol, utmpl, nr);
1559 }
1560 return 0;
1561 }
1562
1563 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1564 {
1565 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1566 struct xfrm_userpolicy_type *upt;
1567 u8 type = XFRM_POLICY_TYPE_MAIN;
1568 int err;
1569
1570 if (rt) {
1571 upt = nla_data(rt);
1572 type = upt->type;
1573 }
1574
1575 err = verify_policy_type(type);
1576 if (err)
1577 return err;
1578
1579 *tp = type;
1580 return 0;
1581 }
1582
1583 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1584 {
1585 xp->priority = p->priority;
1586 xp->index = p->index;
1587 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1588 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1589 xp->action = p->action;
1590 xp->flags = p->flags;
1591 xp->family = p->sel.family;
1592 /* XXX xp->share = p->share; */
1593 }
1594
1595 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1596 {
1597 memset(p, 0, sizeof(*p));
1598 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1599 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1600 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1601 p->priority = xp->priority;
1602 p->index = xp->index;
1603 p->sel.family = xp->family;
1604 p->dir = dir;
1605 p->action = xp->action;
1606 p->flags = xp->flags;
1607 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1608 }
1609
1610 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1611 {
1612 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1613 int err;
1614
1615 if (!xp) {
1616 *errp = -ENOMEM;
1617 return NULL;
1618 }
1619
1620 copy_from_user_policy(xp, p);
1621
1622 err = copy_from_user_policy_type(&xp->type, attrs);
1623 if (err)
1624 goto error;
1625
1626 if (!(err = copy_from_user_tmpl(xp, attrs)))
1627 err = copy_from_user_sec_ctx(xp, attrs);
1628 if (err)
1629 goto error;
1630
1631 xfrm_mark_get(attrs, &xp->mark);
1632
1633 if (attrs[XFRMA_IF_ID])
1634 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1635
1636 return xp;
1637 error:
1638 *errp = err;
1639 xp->walk.dead = 1;
1640 xfrm_policy_destroy(xp);
1641 return NULL;
1642 }
1643
1644 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1645 struct nlattr **attrs)
1646 {
1647 struct net *net = sock_net(skb->sk);
1648 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1649 struct xfrm_policy *xp;
1650 struct km_event c;
1651 int err;
1652 int excl;
1653
1654 err = verify_newpolicy_info(p);
1655 if (err)
1656 return err;
1657 err = verify_sec_ctx_len(attrs);
1658 if (err)
1659 return err;
1660
1661 xp = xfrm_policy_construct(net, p, attrs, &err);
1662 if (!xp)
1663 return err;
1664
1665 /* shouldn't excl be based on nlh flags??
1666 * Aha! this is anti-netlink really i.e more pfkey derived
1667 * in netlink excl is a flag and you wouldnt need
1668 * a type XFRM_MSG_UPDPOLICY - JHS */
1669 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1670 err = xfrm_policy_insert(p->dir, xp, excl);
1671 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1672
1673 if (err) {
1674 security_xfrm_policy_free(xp->security);
1675 kfree(xp);
1676 return err;
1677 }
1678
1679 c.event = nlh->nlmsg_type;
1680 c.seq = nlh->nlmsg_seq;
1681 c.portid = nlh->nlmsg_pid;
1682 km_policy_notify(xp, p->dir, &c);
1683
1684 xfrm_pol_put(xp);
1685
1686 return 0;
1687 }
1688
1689 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1690 {
1691 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1692 int i;
1693
1694 if (xp->xfrm_nr == 0)
1695 return 0;
1696
1697 for (i = 0; i < xp->xfrm_nr; i++) {
1698 struct xfrm_user_tmpl *up = &vec[i];
1699 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1700
1701 memset(up, 0, sizeof(*up));
1702 memcpy(&up->id, &kp->id, sizeof(up->id));
1703 up->family = kp->encap_family;
1704 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1705 up->reqid = kp->reqid;
1706 up->mode = kp->mode;
1707 up->share = kp->share;
1708 up->optional = kp->optional;
1709 up->aalgos = kp->aalgos;
1710 up->ealgos = kp->ealgos;
1711 up->calgos = kp->calgos;
1712 }
1713
1714 return nla_put(skb, XFRMA_TMPL,
1715 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1716 }
1717
1718 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1719 {
1720 if (x->security) {
1721 return copy_sec_ctx(x->security, skb);
1722 }
1723 return 0;
1724 }
1725
1726 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1727 {
1728 if (xp->security)
1729 return copy_sec_ctx(xp->security, skb);
1730 return 0;
1731 }
1732 static inline unsigned int userpolicy_type_attrsize(void)
1733 {
1734 #ifdef CONFIG_XFRM_SUB_POLICY
1735 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1736 #else
1737 return 0;
1738 #endif
1739 }
1740
1741 #ifdef CONFIG_XFRM_SUB_POLICY
1742 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1743 {
1744 struct xfrm_userpolicy_type upt;
1745
1746 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1747 memset(&upt, 0, sizeof(upt));
1748 upt.type = type;
1749
1750 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1751 }
1752
1753 #else
1754 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1755 {
1756 return 0;
1757 }
1758 #endif
1759
1760 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1761 {
1762 struct xfrm_dump_info *sp = ptr;
1763 struct xfrm_userpolicy_info *p;
1764 struct sk_buff *in_skb = sp->in_skb;
1765 struct sk_buff *skb = sp->out_skb;
1766 struct nlmsghdr *nlh;
1767 int err;
1768
1769 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1770 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1771 if (nlh == NULL)
1772 return -EMSGSIZE;
1773
1774 p = nlmsg_data(nlh);
1775 copy_to_user_policy(xp, p, dir);
1776 err = copy_to_user_tmpl(xp, skb);
1777 if (!err)
1778 err = copy_to_user_sec_ctx(xp, skb);
1779 if (!err)
1780 err = copy_to_user_policy_type(xp->type, skb);
1781 if (!err)
1782 err = xfrm_mark_put(skb, &xp->mark);
1783 if (!err)
1784 err = xfrm_if_id_put(skb, xp->if_id);
1785 if (err) {
1786 nlmsg_cancel(skb, nlh);
1787 return err;
1788 }
1789 nlmsg_end(skb, nlh);
1790 return 0;
1791 }
1792
1793 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1794 {
1795 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1796 struct net *net = sock_net(cb->skb->sk);
1797
1798 xfrm_policy_walk_done(walk, net);
1799 return 0;
1800 }
1801
1802 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1803 {
1804 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1805
1806 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1807
1808 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1809 return 0;
1810 }
1811
1812 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1813 {
1814 struct net *net = sock_net(skb->sk);
1815 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1816 struct xfrm_dump_info info;
1817
1818 info.in_skb = cb->skb;
1819 info.out_skb = skb;
1820 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1821 info.nlmsg_flags = NLM_F_MULTI;
1822
1823 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1824
1825 return skb->len;
1826 }
1827
1828 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1829 struct xfrm_policy *xp,
1830 int dir, u32 seq)
1831 {
1832 struct xfrm_dump_info info;
1833 struct sk_buff *skb;
1834 int err;
1835
1836 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1837 if (!skb)
1838 return ERR_PTR(-ENOMEM);
1839
1840 info.in_skb = in_skb;
1841 info.out_skb = skb;
1842 info.nlmsg_seq = seq;
1843 info.nlmsg_flags = 0;
1844
1845 err = dump_one_policy(xp, dir, 0, &info);
1846 if (err) {
1847 kfree_skb(skb);
1848 return ERR_PTR(err);
1849 }
1850
1851 return skb;
1852 }
1853
1854 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1855 struct nlattr **attrs)
1856 {
1857 struct net *net = sock_net(skb->sk);
1858 struct xfrm_policy *xp;
1859 struct xfrm_userpolicy_id *p;
1860 u8 type = XFRM_POLICY_TYPE_MAIN;
1861 int err;
1862 struct km_event c;
1863 int delete;
1864 struct xfrm_mark m;
1865 u32 mark = xfrm_mark_get(attrs, &m);
1866 u32 if_id = 0;
1867
1868 p = nlmsg_data(nlh);
1869 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1870
1871 err = copy_from_user_policy_type(&type, attrs);
1872 if (err)
1873 return err;
1874
1875 err = verify_policy_dir(p->dir);
1876 if (err)
1877 return err;
1878
1879 if (attrs[XFRMA_IF_ID])
1880 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1881
1882 if (p->index)
1883 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err);
1884 else {
1885 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1886 struct xfrm_sec_ctx *ctx;
1887
1888 err = verify_sec_ctx_len(attrs);
1889 if (err)
1890 return err;
1891
1892 ctx = NULL;
1893 if (rt) {
1894 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1895
1896 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1897 if (err)
1898 return err;
1899 }
1900 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
1901 ctx, delete, &err);
1902 security_xfrm_policy_free(ctx);
1903 }
1904 if (xp == NULL)
1905 return -ENOENT;
1906
1907 if (!delete) {
1908 struct sk_buff *resp_skb;
1909
1910 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1911 if (IS_ERR(resp_skb)) {
1912 err = PTR_ERR(resp_skb);
1913 } else {
1914 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1915 NETLINK_CB(skb).portid);
1916 }
1917 } else {
1918 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1919
1920 if (err != 0)
1921 goto out;
1922
1923 c.data.byid = p->index;
1924 c.event = nlh->nlmsg_type;
1925 c.seq = nlh->nlmsg_seq;
1926 c.portid = nlh->nlmsg_pid;
1927 km_policy_notify(xp, p->dir, &c);
1928 }
1929
1930 out:
1931 xfrm_pol_put(xp);
1932 return err;
1933 }
1934
1935 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1936 struct nlattr **attrs)
1937 {
1938 struct net *net = sock_net(skb->sk);
1939 struct km_event c;
1940 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1941 int err;
1942
1943 err = xfrm_state_flush(net, p->proto, true, false);
1944 if (err) {
1945 if (err == -ESRCH) /* empty table */
1946 return 0;
1947 return err;
1948 }
1949 c.data.proto = p->proto;
1950 c.event = nlh->nlmsg_type;
1951 c.seq = nlh->nlmsg_seq;
1952 c.portid = nlh->nlmsg_pid;
1953 c.net = net;
1954 km_state_notify(NULL, &c);
1955
1956 return 0;
1957 }
1958
1959 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1960 {
1961 unsigned int replay_size = x->replay_esn ?
1962 xfrm_replay_state_esn_len(x->replay_esn) :
1963 sizeof(struct xfrm_replay_state);
1964
1965 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1966 + nla_total_size(replay_size)
1967 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1968 + nla_total_size(sizeof(struct xfrm_mark))
1969 + nla_total_size(4) /* XFRM_AE_RTHR */
1970 + nla_total_size(4); /* XFRM_AE_ETHR */
1971 }
1972
1973 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1974 {
1975 struct xfrm_aevent_id *id;
1976 struct nlmsghdr *nlh;
1977 int err;
1978
1979 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1980 if (nlh == NULL)
1981 return -EMSGSIZE;
1982
1983 id = nlmsg_data(nlh);
1984 memset(&id->sa_id, 0, sizeof(id->sa_id));
1985 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1986 id->sa_id.spi = x->id.spi;
1987 id->sa_id.family = x->props.family;
1988 id->sa_id.proto = x->id.proto;
1989 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1990 id->reqid = x->props.reqid;
1991 id->flags = c->data.aevent;
1992
1993 if (x->replay_esn) {
1994 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1995 xfrm_replay_state_esn_len(x->replay_esn),
1996 x->replay_esn);
1997 } else {
1998 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1999 &x->replay);
2000 }
2001 if (err)
2002 goto out_cancel;
2003 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2004 XFRMA_PAD);
2005 if (err)
2006 goto out_cancel;
2007
2008 if (id->flags & XFRM_AE_RTHR) {
2009 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2010 if (err)
2011 goto out_cancel;
2012 }
2013 if (id->flags & XFRM_AE_ETHR) {
2014 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2015 x->replay_maxage * 10 / HZ);
2016 if (err)
2017 goto out_cancel;
2018 }
2019 err = xfrm_mark_put(skb, &x->mark);
2020 if (err)
2021 goto out_cancel;
2022
2023 err = xfrm_if_id_put(skb, x->if_id);
2024 if (err)
2025 goto out_cancel;
2026
2027 nlmsg_end(skb, nlh);
2028 return 0;
2029
2030 out_cancel:
2031 nlmsg_cancel(skb, nlh);
2032 return err;
2033 }
2034
2035 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2036 struct nlattr **attrs)
2037 {
2038 struct net *net = sock_net(skb->sk);
2039 struct xfrm_state *x;
2040 struct sk_buff *r_skb;
2041 int err;
2042 struct km_event c;
2043 u32 mark;
2044 struct xfrm_mark m;
2045 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2046 struct xfrm_usersa_id *id = &p->sa_id;
2047
2048 mark = xfrm_mark_get(attrs, &m);
2049
2050 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2051 if (x == NULL)
2052 return -ESRCH;
2053
2054 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2055 if (r_skb == NULL) {
2056 xfrm_state_put(x);
2057 return -ENOMEM;
2058 }
2059
2060 /*
2061 * XXX: is this lock really needed - none of the other
2062 * gets lock (the concern is things getting updated
2063 * while we are still reading) - jhs
2064 */
2065 spin_lock_bh(&x->lock);
2066 c.data.aevent = p->flags;
2067 c.seq = nlh->nlmsg_seq;
2068 c.portid = nlh->nlmsg_pid;
2069
2070 err = build_aevent(r_skb, x, &c);
2071 BUG_ON(err < 0);
2072
2073 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2074 spin_unlock_bh(&x->lock);
2075 xfrm_state_put(x);
2076 return err;
2077 }
2078
2079 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2080 struct nlattr **attrs)
2081 {
2082 struct net *net = sock_net(skb->sk);
2083 struct xfrm_state *x;
2084 struct km_event c;
2085 int err = -EINVAL;
2086 u32 mark = 0;
2087 struct xfrm_mark m;
2088 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2089 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2090 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2091 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2092 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2093 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2094
2095 if (!lt && !rp && !re && !et && !rt)
2096 return err;
2097
2098 /* pedantic mode - thou shalt sayeth replaceth */
2099 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2100 return err;
2101
2102 mark = xfrm_mark_get(attrs, &m);
2103
2104 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2105 if (x == NULL)
2106 return -ESRCH;
2107
2108 if (x->km.state != XFRM_STATE_VALID)
2109 goto out;
2110
2111 err = xfrm_replay_verify_len(x->replay_esn, re);
2112 if (err)
2113 goto out;
2114
2115 spin_lock_bh(&x->lock);
2116 xfrm_update_ae_params(x, attrs, 1);
2117 spin_unlock_bh(&x->lock);
2118
2119 c.event = nlh->nlmsg_type;
2120 c.seq = nlh->nlmsg_seq;
2121 c.portid = nlh->nlmsg_pid;
2122 c.data.aevent = XFRM_AE_CU;
2123 km_state_notify(x, &c);
2124 err = 0;
2125 out:
2126 xfrm_state_put(x);
2127 return err;
2128 }
2129
2130 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2131 struct nlattr **attrs)
2132 {
2133 struct net *net = sock_net(skb->sk);
2134 struct km_event c;
2135 u8 type = XFRM_POLICY_TYPE_MAIN;
2136 int err;
2137
2138 err = copy_from_user_policy_type(&type, attrs);
2139 if (err)
2140 return err;
2141
2142 err = xfrm_policy_flush(net, type, true);
2143 if (err) {
2144 if (err == -ESRCH) /* empty table */
2145 return 0;
2146 return err;
2147 }
2148
2149 c.data.type = type;
2150 c.event = nlh->nlmsg_type;
2151 c.seq = nlh->nlmsg_seq;
2152 c.portid = nlh->nlmsg_pid;
2153 c.net = net;
2154 km_policy_notify(NULL, 0, &c);
2155 return 0;
2156 }
2157
2158 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2159 struct nlattr **attrs)
2160 {
2161 struct net *net = sock_net(skb->sk);
2162 struct xfrm_policy *xp;
2163 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2164 struct xfrm_userpolicy_info *p = &up->pol;
2165 u8 type = XFRM_POLICY_TYPE_MAIN;
2166 int err = -ENOENT;
2167 struct xfrm_mark m;
2168 u32 mark = xfrm_mark_get(attrs, &m);
2169 u32 if_id = 0;
2170
2171 err = copy_from_user_policy_type(&type, attrs);
2172 if (err)
2173 return err;
2174
2175 err = verify_policy_dir(p->dir);
2176 if (err)
2177 return err;
2178
2179 if (attrs[XFRMA_IF_ID])
2180 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2181
2182 if (p->index)
2183 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err);
2184 else {
2185 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2186 struct xfrm_sec_ctx *ctx;
2187
2188 err = verify_sec_ctx_len(attrs);
2189 if (err)
2190 return err;
2191
2192 ctx = NULL;
2193 if (rt) {
2194 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2195
2196 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2197 if (err)
2198 return err;
2199 }
2200 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
2201 &p->sel, ctx, 0, &err);
2202 security_xfrm_policy_free(ctx);
2203 }
2204 if (xp == NULL)
2205 return -ENOENT;
2206
2207 if (unlikely(xp->walk.dead))
2208 goto out;
2209
2210 err = 0;
2211 if (up->hard) {
2212 xfrm_policy_delete(xp, p->dir);
2213 xfrm_audit_policy_delete(xp, 1, true);
2214 }
2215 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2216
2217 out:
2218 xfrm_pol_put(xp);
2219 return err;
2220 }
2221
2222 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2223 struct nlattr **attrs)
2224 {
2225 struct net *net = sock_net(skb->sk);
2226 struct xfrm_state *x;
2227 int err;
2228 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2229 struct xfrm_usersa_info *p = &ue->state;
2230 struct xfrm_mark m;
2231 u32 mark = xfrm_mark_get(attrs, &m);
2232
2233 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2234
2235 err = -ENOENT;
2236 if (x == NULL)
2237 return err;
2238
2239 spin_lock_bh(&x->lock);
2240 err = -EINVAL;
2241 if (x->km.state != XFRM_STATE_VALID)
2242 goto out;
2243 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2244
2245 if (ue->hard) {
2246 __xfrm_state_delete(x);
2247 xfrm_audit_state_delete(x, 1, true);
2248 }
2249 err = 0;
2250 out:
2251 spin_unlock_bh(&x->lock);
2252 xfrm_state_put(x);
2253 return err;
2254 }
2255
2256 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2257 struct nlattr **attrs)
2258 {
2259 struct net *net = sock_net(skb->sk);
2260 struct xfrm_policy *xp;
2261 struct xfrm_user_tmpl *ut;
2262 int i;
2263 struct nlattr *rt = attrs[XFRMA_TMPL];
2264 struct xfrm_mark mark;
2265
2266 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2267 struct xfrm_state *x = xfrm_state_alloc(net);
2268 int err = -ENOMEM;
2269
2270 if (!x)
2271 goto nomem;
2272
2273 xfrm_mark_get(attrs, &mark);
2274
2275 err = verify_newpolicy_info(&ua->policy);
2276 if (err)
2277 goto free_state;
2278
2279 /* build an XP */
2280 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2281 if (!xp)
2282 goto free_state;
2283
2284 memcpy(&x->id, &ua->id, sizeof(ua->id));
2285 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2286 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2287 xp->mark.m = x->mark.m = mark.m;
2288 xp->mark.v = x->mark.v = mark.v;
2289 ut = nla_data(rt);
2290 /* extract the templates and for each call km_key */
2291 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2292 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2293 memcpy(&x->id, &t->id, sizeof(x->id));
2294 x->props.mode = t->mode;
2295 x->props.reqid = t->reqid;
2296 x->props.family = ut->family;
2297 t->aalgos = ua->aalgos;
2298 t->ealgos = ua->ealgos;
2299 t->calgos = ua->calgos;
2300 err = km_query(x, t, xp);
2301
2302 }
2303
2304 xfrm_state_free(x);
2305 kfree(xp);
2306
2307 return 0;
2308
2309 free_state:
2310 xfrm_state_free(x);
2311 nomem:
2312 return err;
2313 }
2314
2315 #ifdef CONFIG_XFRM_MIGRATE
2316 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2317 struct xfrm_kmaddress *k,
2318 struct nlattr **attrs, int *num)
2319 {
2320 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2321 struct xfrm_user_migrate *um;
2322 int i, num_migrate;
2323
2324 if (k != NULL) {
2325 struct xfrm_user_kmaddress *uk;
2326
2327 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2328 memcpy(&k->local, &uk->local, sizeof(k->local));
2329 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2330 k->family = uk->family;
2331 k->reserved = uk->reserved;
2332 }
2333
2334 um = nla_data(rt);
2335 num_migrate = nla_len(rt) / sizeof(*um);
2336
2337 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2338 return -EINVAL;
2339
2340 for (i = 0; i < num_migrate; i++, um++, ma++) {
2341 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2342 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2343 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2344 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2345
2346 ma->proto = um->proto;
2347 ma->mode = um->mode;
2348 ma->reqid = um->reqid;
2349
2350 ma->old_family = um->old_family;
2351 ma->new_family = um->new_family;
2352 }
2353
2354 *num = i;
2355 return 0;
2356 }
2357
2358 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2359 struct nlattr **attrs)
2360 {
2361 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2362 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2363 struct xfrm_kmaddress km, *kmp;
2364 u8 type;
2365 int err;
2366 int n = 0;
2367 struct net *net = sock_net(skb->sk);
2368 struct xfrm_encap_tmpl *encap = NULL;
2369
2370 if (attrs[XFRMA_MIGRATE] == NULL)
2371 return -EINVAL;
2372
2373 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2374
2375 err = copy_from_user_policy_type(&type, attrs);
2376 if (err)
2377 return err;
2378
2379 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2380 if (err)
2381 return err;
2382
2383 if (!n)
2384 return 0;
2385
2386 if (attrs[XFRMA_ENCAP]) {
2387 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2388 sizeof(*encap), GFP_KERNEL);
2389 if (!encap)
2390 return 0;
2391 }
2392
2393 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2394
2395 kfree(encap);
2396
2397 return err;
2398 }
2399 #else
2400 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2401 struct nlattr **attrs)
2402 {
2403 return -ENOPROTOOPT;
2404 }
2405 #endif
2406
2407 #ifdef CONFIG_XFRM_MIGRATE
2408 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2409 {
2410 struct xfrm_user_migrate um;
2411
2412 memset(&um, 0, sizeof(um));
2413 um.proto = m->proto;
2414 um.mode = m->mode;
2415 um.reqid = m->reqid;
2416 um.old_family = m->old_family;
2417 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2418 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2419 um.new_family = m->new_family;
2420 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2421 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2422
2423 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2424 }
2425
2426 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2427 {
2428 struct xfrm_user_kmaddress uk;
2429
2430 memset(&uk, 0, sizeof(uk));
2431 uk.family = k->family;
2432 uk.reserved = k->reserved;
2433 memcpy(&uk.local, &k->local, sizeof(uk.local));
2434 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2435
2436 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2437 }
2438
2439 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2440 int with_encp)
2441 {
2442 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2443 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2444 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2445 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2446 + userpolicy_type_attrsize();
2447 }
2448
2449 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2450 int num_migrate, const struct xfrm_kmaddress *k,
2451 const struct xfrm_selector *sel,
2452 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2453 {
2454 const struct xfrm_migrate *mp;
2455 struct xfrm_userpolicy_id *pol_id;
2456 struct nlmsghdr *nlh;
2457 int i, err;
2458
2459 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2460 if (nlh == NULL)
2461 return -EMSGSIZE;
2462
2463 pol_id = nlmsg_data(nlh);
2464 /* copy data from selector, dir, and type to the pol_id */
2465 memset(pol_id, 0, sizeof(*pol_id));
2466 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2467 pol_id->dir = dir;
2468
2469 if (k != NULL) {
2470 err = copy_to_user_kmaddress(k, skb);
2471 if (err)
2472 goto out_cancel;
2473 }
2474 if (encap) {
2475 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2476 if (err)
2477 goto out_cancel;
2478 }
2479 err = copy_to_user_policy_type(type, skb);
2480 if (err)
2481 goto out_cancel;
2482 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2483 err = copy_to_user_migrate(mp, skb);
2484 if (err)
2485 goto out_cancel;
2486 }
2487
2488 nlmsg_end(skb, nlh);
2489 return 0;
2490
2491 out_cancel:
2492 nlmsg_cancel(skb, nlh);
2493 return err;
2494 }
2495
2496 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2497 const struct xfrm_migrate *m, int num_migrate,
2498 const struct xfrm_kmaddress *k,
2499 const struct xfrm_encap_tmpl *encap)
2500 {
2501 struct net *net = &init_net;
2502 struct sk_buff *skb;
2503 int err;
2504
2505 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2506 GFP_ATOMIC);
2507 if (skb == NULL)
2508 return -ENOMEM;
2509
2510 /* build migrate */
2511 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2512 BUG_ON(err < 0);
2513
2514 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2515 }
2516 #else
2517 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2518 const struct xfrm_migrate *m, int num_migrate,
2519 const struct xfrm_kmaddress *k,
2520 const struct xfrm_encap_tmpl *encap)
2521 {
2522 return -ENOPROTOOPT;
2523 }
2524 #endif
2525
2526 #define XMSGSIZE(type) sizeof(struct type)
2527
2528 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2529 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2530 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2531 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2532 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2533 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2534 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2535 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2536 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2537 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2538 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2539 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2540 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2541 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2542 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2543 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2544 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2545 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2546 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2547 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2548 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2549 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2550 };
2551
2552 #undef XMSGSIZE
2553
2554 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2555 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2556 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2557 [XFRMA_LASTUSED] = { .type = NLA_U64},
2558 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2559 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2560 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2561 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2562 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2563 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2564 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2565 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2566 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2567 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2568 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2569 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2570 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2571 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2572 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2573 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2574 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2575 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2576 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2577 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2578 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2579 [XFRMA_PROTO] = { .type = NLA_U8 },
2580 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2581 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2582 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2583 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2584 [XFRMA_IF_ID] = { .type = NLA_U32 },
2585 };
2586
2587 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2588 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2589 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2590 };
2591
2592 static const struct xfrm_link {
2593 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2594 int (*start)(struct netlink_callback *);
2595 int (*dump)(struct sk_buff *, struct netlink_callback *);
2596 int (*done)(struct netlink_callback *);
2597 const struct nla_policy *nla_pol;
2598 int nla_max;
2599 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2600 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2601 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2602 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2603 .dump = xfrm_dump_sa,
2604 .done = xfrm_dump_sa_done },
2605 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2606 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2607 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2608 .start = xfrm_dump_policy_start,
2609 .dump = xfrm_dump_policy,
2610 .done = xfrm_dump_policy_done },
2611 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2612 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2613 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2614 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2615 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2616 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2617 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2618 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2619 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2620 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2621 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2622 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2623 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2624 .nla_pol = xfrma_spd_policy,
2625 .nla_max = XFRMA_SPD_MAX },
2626 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2627 };
2628
2629 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2630 struct netlink_ext_ack *extack)
2631 {
2632 struct net *net = sock_net(skb->sk);
2633 struct nlattr *attrs[XFRMA_MAX+1];
2634 const struct xfrm_link *link;
2635 int type, err;
2636
2637 if (in_compat_syscall())
2638 return -EOPNOTSUPP;
2639
2640 type = nlh->nlmsg_type;
2641 if (type > XFRM_MSG_MAX)
2642 return -EINVAL;
2643
2644 type -= XFRM_MSG_BASE;
2645 link = &xfrm_dispatch[type];
2646
2647 /* All operations require privileges, even GET */
2648 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2649 return -EPERM;
2650
2651 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2652 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2653 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2654 if (link->dump == NULL)
2655 return -EINVAL;
2656
2657 {
2658 struct netlink_dump_control c = {
2659 .start = link->start,
2660 .dump = link->dump,
2661 .done = link->done,
2662 };
2663 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2664 }
2665 }
2666
2667 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2668 link->nla_max ? : XFRMA_MAX,
2669 link->nla_pol ? : xfrma_policy, extack);
2670 if (err < 0)
2671 return err;
2672
2673 if (link->doit == NULL)
2674 return -EINVAL;
2675
2676 return link->doit(skb, nlh, attrs);
2677 }
2678
2679 static void xfrm_netlink_rcv(struct sk_buff *skb)
2680 {
2681 struct net *net = sock_net(skb->sk);
2682
2683 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2684 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2685 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2686 }
2687
2688 static inline unsigned int xfrm_expire_msgsize(void)
2689 {
2690 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2691 + nla_total_size(sizeof(struct xfrm_mark));
2692 }
2693
2694 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2695 {
2696 struct xfrm_user_expire *ue;
2697 struct nlmsghdr *nlh;
2698 int err;
2699
2700 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2701 if (nlh == NULL)
2702 return -EMSGSIZE;
2703
2704 ue = nlmsg_data(nlh);
2705 copy_to_user_state(x, &ue->state);
2706 ue->hard = (c->data.hard != 0) ? 1 : 0;
2707 /* clear the padding bytes */
2708 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2709
2710 err = xfrm_mark_put(skb, &x->mark);
2711 if (err)
2712 return err;
2713
2714 err = xfrm_if_id_put(skb, x->if_id);
2715 if (err)
2716 return err;
2717
2718 nlmsg_end(skb, nlh);
2719 return 0;
2720 }
2721
2722 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2723 {
2724 struct net *net = xs_net(x);
2725 struct sk_buff *skb;
2726
2727 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2728 if (skb == NULL)
2729 return -ENOMEM;
2730
2731 if (build_expire(skb, x, c) < 0) {
2732 kfree_skb(skb);
2733 return -EMSGSIZE;
2734 }
2735
2736 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2737 }
2738
2739 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2740 {
2741 struct net *net = xs_net(x);
2742 struct sk_buff *skb;
2743 int err;
2744
2745 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2746 if (skb == NULL)
2747 return -ENOMEM;
2748
2749 err = build_aevent(skb, x, c);
2750 BUG_ON(err < 0);
2751
2752 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2753 }
2754
2755 static int xfrm_notify_sa_flush(const struct km_event *c)
2756 {
2757 struct net *net = c->net;
2758 struct xfrm_usersa_flush *p;
2759 struct nlmsghdr *nlh;
2760 struct sk_buff *skb;
2761 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2762
2763 skb = nlmsg_new(len, GFP_ATOMIC);
2764 if (skb == NULL)
2765 return -ENOMEM;
2766
2767 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2768 if (nlh == NULL) {
2769 kfree_skb(skb);
2770 return -EMSGSIZE;
2771 }
2772
2773 p = nlmsg_data(nlh);
2774 p->proto = c->data.proto;
2775
2776 nlmsg_end(skb, nlh);
2777
2778 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2779 }
2780
2781 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2782 {
2783 unsigned int l = 0;
2784 if (x->aead)
2785 l += nla_total_size(aead_len(x->aead));
2786 if (x->aalg) {
2787 l += nla_total_size(sizeof(struct xfrm_algo) +
2788 (x->aalg->alg_key_len + 7) / 8);
2789 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2790 }
2791 if (x->ealg)
2792 l += nla_total_size(xfrm_alg_len(x->ealg));
2793 if (x->calg)
2794 l += nla_total_size(sizeof(*x->calg));
2795 if (x->encap)
2796 l += nla_total_size(sizeof(*x->encap));
2797 if (x->tfcpad)
2798 l += nla_total_size(sizeof(x->tfcpad));
2799 if (x->replay_esn)
2800 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2801 else
2802 l += nla_total_size(sizeof(struct xfrm_replay_state));
2803 if (x->security)
2804 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2805 x->security->ctx_len);
2806 if (x->coaddr)
2807 l += nla_total_size(sizeof(*x->coaddr));
2808 if (x->props.extra_flags)
2809 l += nla_total_size(sizeof(x->props.extra_flags));
2810 if (x->xso.dev)
2811 l += nla_total_size(sizeof(x->xso));
2812 if (x->props.smark.v | x->props.smark.m) {
2813 l += nla_total_size(sizeof(x->props.smark.v));
2814 l += nla_total_size(sizeof(x->props.smark.m));
2815 }
2816 if (x->if_id)
2817 l += nla_total_size(sizeof(x->if_id));
2818
2819 /* Must count x->lastused as it may become non-zero behind our back. */
2820 l += nla_total_size_64bit(sizeof(u64));
2821
2822 return l;
2823 }
2824
2825 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2826 {
2827 struct net *net = xs_net(x);
2828 struct xfrm_usersa_info *p;
2829 struct xfrm_usersa_id *id;
2830 struct nlmsghdr *nlh;
2831 struct sk_buff *skb;
2832 unsigned int len = xfrm_sa_len(x);
2833 unsigned int headlen;
2834 int err;
2835
2836 headlen = sizeof(*p);
2837 if (c->event == XFRM_MSG_DELSA) {
2838 len += nla_total_size(headlen);
2839 headlen = sizeof(*id);
2840 len += nla_total_size(sizeof(struct xfrm_mark));
2841 }
2842 len += NLMSG_ALIGN(headlen);
2843
2844 skb = nlmsg_new(len, GFP_ATOMIC);
2845 if (skb == NULL)
2846 return -ENOMEM;
2847
2848 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2849 err = -EMSGSIZE;
2850 if (nlh == NULL)
2851 goto out_free_skb;
2852
2853 p = nlmsg_data(nlh);
2854 if (c->event == XFRM_MSG_DELSA) {
2855 struct nlattr *attr;
2856
2857 id = nlmsg_data(nlh);
2858 memset(id, 0, sizeof(*id));
2859 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2860 id->spi = x->id.spi;
2861 id->family = x->props.family;
2862 id->proto = x->id.proto;
2863
2864 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2865 err = -EMSGSIZE;
2866 if (attr == NULL)
2867 goto out_free_skb;
2868
2869 p = nla_data(attr);
2870 }
2871 err = copy_to_user_state_extra(x, p, skb);
2872 if (err)
2873 goto out_free_skb;
2874
2875 nlmsg_end(skb, nlh);
2876
2877 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2878
2879 out_free_skb:
2880 kfree_skb(skb);
2881 return err;
2882 }
2883
2884 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2885 {
2886
2887 switch (c->event) {
2888 case XFRM_MSG_EXPIRE:
2889 return xfrm_exp_state_notify(x, c);
2890 case XFRM_MSG_NEWAE:
2891 return xfrm_aevent_state_notify(x, c);
2892 case XFRM_MSG_DELSA:
2893 case XFRM_MSG_UPDSA:
2894 case XFRM_MSG_NEWSA:
2895 return xfrm_notify_sa(x, c);
2896 case XFRM_MSG_FLUSHSA:
2897 return xfrm_notify_sa_flush(c);
2898 default:
2899 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2900 c->event);
2901 break;
2902 }
2903
2904 return 0;
2905
2906 }
2907
2908 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2909 struct xfrm_policy *xp)
2910 {
2911 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2912 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2913 + nla_total_size(sizeof(struct xfrm_mark))
2914 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2915 + userpolicy_type_attrsize();
2916 }
2917
2918 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2919 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2920 {
2921 __u32 seq = xfrm_get_acqseq();
2922 struct xfrm_user_acquire *ua;
2923 struct nlmsghdr *nlh;
2924 int err;
2925
2926 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2927 if (nlh == NULL)
2928 return -EMSGSIZE;
2929
2930 ua = nlmsg_data(nlh);
2931 memcpy(&ua->id, &x->id, sizeof(ua->id));
2932 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2933 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2934 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2935 ua->aalgos = xt->aalgos;
2936 ua->ealgos = xt->ealgos;
2937 ua->calgos = xt->calgos;
2938 ua->seq = x->km.seq = seq;
2939
2940 err = copy_to_user_tmpl(xp, skb);
2941 if (!err)
2942 err = copy_to_user_state_sec_ctx(x, skb);
2943 if (!err)
2944 err = copy_to_user_policy_type(xp->type, skb);
2945 if (!err)
2946 err = xfrm_mark_put(skb, &xp->mark);
2947 if (!err)
2948 err = xfrm_if_id_put(skb, xp->if_id);
2949 if (err) {
2950 nlmsg_cancel(skb, nlh);
2951 return err;
2952 }
2953
2954 nlmsg_end(skb, nlh);
2955 return 0;
2956 }
2957
2958 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2959 struct xfrm_policy *xp)
2960 {
2961 struct net *net = xs_net(x);
2962 struct sk_buff *skb;
2963 int err;
2964
2965 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2966 if (skb == NULL)
2967 return -ENOMEM;
2968
2969 err = build_acquire(skb, x, xt, xp);
2970 BUG_ON(err < 0);
2971
2972 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2973 }
2974
2975 /* User gives us xfrm_user_policy_info followed by an array of 0
2976 * or more templates.
2977 */
2978 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2979 u8 *data, int len, int *dir)
2980 {
2981 struct net *net = sock_net(sk);
2982 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2983 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2984 struct xfrm_policy *xp;
2985 int nr;
2986
2987 switch (sk->sk_family) {
2988 case AF_INET:
2989 if (opt != IP_XFRM_POLICY) {
2990 *dir = -EOPNOTSUPP;
2991 return NULL;
2992 }
2993 break;
2994 #if IS_ENABLED(CONFIG_IPV6)
2995 case AF_INET6:
2996 if (opt != IPV6_XFRM_POLICY) {
2997 *dir = -EOPNOTSUPP;
2998 return NULL;
2999 }
3000 break;
3001 #endif
3002 default:
3003 *dir = -EINVAL;
3004 return NULL;
3005 }
3006
3007 *dir = -EINVAL;
3008
3009 if (len < sizeof(*p) ||
3010 verify_newpolicy_info(p))
3011 return NULL;
3012
3013 nr = ((len - sizeof(*p)) / sizeof(*ut));
3014 if (validate_tmpl(nr, ut, p->sel.family))
3015 return NULL;
3016
3017 if (p->dir > XFRM_POLICY_OUT)
3018 return NULL;
3019
3020 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3021 if (xp == NULL) {
3022 *dir = -ENOBUFS;
3023 return NULL;
3024 }
3025
3026 copy_from_user_policy(xp, p);
3027 xp->type = XFRM_POLICY_TYPE_MAIN;
3028 copy_templates(xp, ut, nr);
3029
3030 *dir = p->dir;
3031
3032 return xp;
3033 }
3034
3035 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3036 {
3037 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3038 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3039 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3040 + nla_total_size(sizeof(struct xfrm_mark))
3041 + userpolicy_type_attrsize();
3042 }
3043
3044 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3045 int dir, const struct km_event *c)
3046 {
3047 struct xfrm_user_polexpire *upe;
3048 int hard = c->data.hard;
3049 struct nlmsghdr *nlh;
3050 int err;
3051
3052 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3053 if (nlh == NULL)
3054 return -EMSGSIZE;
3055
3056 upe = nlmsg_data(nlh);
3057 copy_to_user_policy(xp, &upe->pol, dir);
3058 err = copy_to_user_tmpl(xp, skb);
3059 if (!err)
3060 err = copy_to_user_sec_ctx(xp, skb);
3061 if (!err)
3062 err = copy_to_user_policy_type(xp->type, skb);
3063 if (!err)
3064 err = xfrm_mark_put(skb, &xp->mark);
3065 if (!err)
3066 err = xfrm_if_id_put(skb, xp->if_id);
3067 if (err) {
3068 nlmsg_cancel(skb, nlh);
3069 return err;
3070 }
3071 upe->hard = !!hard;
3072
3073 nlmsg_end(skb, nlh);
3074 return 0;
3075 }
3076
3077 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3078 {
3079 struct net *net = xp_net(xp);
3080 struct sk_buff *skb;
3081 int err;
3082
3083 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3084 if (skb == NULL)
3085 return -ENOMEM;
3086
3087 err = build_polexpire(skb, xp, dir, c);
3088 BUG_ON(err < 0);
3089
3090 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3091 }
3092
3093 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3094 {
3095 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3096 struct net *net = xp_net(xp);
3097 struct xfrm_userpolicy_info *p;
3098 struct xfrm_userpolicy_id *id;
3099 struct nlmsghdr *nlh;
3100 struct sk_buff *skb;
3101 unsigned int headlen;
3102 int err;
3103
3104 headlen = sizeof(*p);
3105 if (c->event == XFRM_MSG_DELPOLICY) {
3106 len += nla_total_size(headlen);
3107 headlen = sizeof(*id);
3108 }
3109 len += userpolicy_type_attrsize();
3110 len += nla_total_size(sizeof(struct xfrm_mark));
3111 len += NLMSG_ALIGN(headlen);
3112
3113 skb = nlmsg_new(len, GFP_ATOMIC);
3114 if (skb == NULL)
3115 return -ENOMEM;
3116
3117 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3118 err = -EMSGSIZE;
3119 if (nlh == NULL)
3120 goto out_free_skb;
3121
3122 p = nlmsg_data(nlh);
3123 if (c->event == XFRM_MSG_DELPOLICY) {
3124 struct nlattr *attr;
3125
3126 id = nlmsg_data(nlh);
3127 memset(id, 0, sizeof(*id));
3128 id->dir = dir;
3129 if (c->data.byid)
3130 id->index = xp->index;
3131 else
3132 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3133
3134 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3135 err = -EMSGSIZE;
3136 if (attr == NULL)
3137 goto out_free_skb;
3138
3139 p = nla_data(attr);
3140 }
3141
3142 copy_to_user_policy(xp, p, dir);
3143 err = copy_to_user_tmpl(xp, skb);
3144 if (!err)
3145 err = copy_to_user_policy_type(xp->type, skb);
3146 if (!err)
3147 err = xfrm_mark_put(skb, &xp->mark);
3148 if (!err)
3149 err = xfrm_if_id_put(skb, xp->if_id);
3150 if (err)
3151 goto out_free_skb;
3152
3153 nlmsg_end(skb, nlh);
3154
3155 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3156
3157 out_free_skb:
3158 kfree_skb(skb);
3159 return err;
3160 }
3161
3162 static int xfrm_notify_policy_flush(const struct km_event *c)
3163 {
3164 struct net *net = c->net;
3165 struct nlmsghdr *nlh;
3166 struct sk_buff *skb;
3167 int err;
3168
3169 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3170 if (skb == NULL)
3171 return -ENOMEM;
3172
3173 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3174 err = -EMSGSIZE;
3175 if (nlh == NULL)
3176 goto out_free_skb;
3177 err = copy_to_user_policy_type(c->data.type, skb);
3178 if (err)
3179 goto out_free_skb;
3180
3181 nlmsg_end(skb, nlh);
3182
3183 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3184
3185 out_free_skb:
3186 kfree_skb(skb);
3187 return err;
3188 }
3189
3190 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3191 {
3192
3193 switch (c->event) {
3194 case XFRM_MSG_NEWPOLICY:
3195 case XFRM_MSG_UPDPOLICY:
3196 case XFRM_MSG_DELPOLICY:
3197 return xfrm_notify_policy(xp, dir, c);
3198 case XFRM_MSG_FLUSHPOLICY:
3199 return xfrm_notify_policy_flush(c);
3200 case XFRM_MSG_POLEXPIRE:
3201 return xfrm_exp_policy_notify(xp, dir, c);
3202 default:
3203 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3204 c->event);
3205 }
3206
3207 return 0;
3208
3209 }
3210
3211 static inline unsigned int xfrm_report_msgsize(void)
3212 {
3213 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3214 }
3215
3216 static int build_report(struct sk_buff *skb, u8 proto,
3217 struct xfrm_selector *sel, xfrm_address_t *addr)
3218 {
3219 struct xfrm_user_report *ur;
3220 struct nlmsghdr *nlh;
3221
3222 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3223 if (nlh == NULL)
3224 return -EMSGSIZE;
3225
3226 ur = nlmsg_data(nlh);
3227 ur->proto = proto;
3228 memcpy(&ur->sel, sel, sizeof(ur->sel));
3229
3230 if (addr) {
3231 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3232 if (err) {
3233 nlmsg_cancel(skb, nlh);
3234 return err;
3235 }
3236 }
3237 nlmsg_end(skb, nlh);
3238 return 0;
3239 }
3240
3241 static int xfrm_send_report(struct net *net, u8 proto,
3242 struct xfrm_selector *sel, xfrm_address_t *addr)
3243 {
3244 struct sk_buff *skb;
3245 int err;
3246
3247 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3248 if (skb == NULL)
3249 return -ENOMEM;
3250
3251 err = build_report(skb, proto, sel, addr);
3252 BUG_ON(err < 0);
3253
3254 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3255 }
3256
3257 static inline unsigned int xfrm_mapping_msgsize(void)
3258 {
3259 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3260 }
3261
3262 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3263 xfrm_address_t *new_saddr, __be16 new_sport)
3264 {
3265 struct xfrm_user_mapping *um;
3266 struct nlmsghdr *nlh;
3267
3268 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3269 if (nlh == NULL)
3270 return -EMSGSIZE;
3271
3272 um = nlmsg_data(nlh);
3273
3274 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3275 um->id.spi = x->id.spi;
3276 um->id.family = x->props.family;
3277 um->id.proto = x->id.proto;
3278 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3279 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3280 um->new_sport = new_sport;
3281 um->old_sport = x->encap->encap_sport;
3282 um->reqid = x->props.reqid;
3283
3284 nlmsg_end(skb, nlh);
3285 return 0;
3286 }
3287
3288 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3289 __be16 sport)
3290 {
3291 struct net *net = xs_net(x);
3292 struct sk_buff *skb;
3293 int err;
3294
3295 if (x->id.proto != IPPROTO_ESP)
3296 return -EINVAL;
3297
3298 if (!x->encap)
3299 return -EINVAL;
3300
3301 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3302 if (skb == NULL)
3303 return -ENOMEM;
3304
3305 err = build_mapping(skb, x, ipaddr, sport);
3306 BUG_ON(err < 0);
3307
3308 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3309 }
3310
3311 static bool xfrm_is_alive(const struct km_event *c)
3312 {
3313 return (bool)xfrm_acquire_is_on(c->net);
3314 }
3315
3316 static struct xfrm_mgr netlink_mgr = {
3317 .notify = xfrm_send_state_notify,
3318 .acquire = xfrm_send_acquire,
3319 .compile_policy = xfrm_compile_policy,
3320 .notify_policy = xfrm_send_policy_notify,
3321 .report = xfrm_send_report,
3322 .migrate = xfrm_send_migrate,
3323 .new_mapping = xfrm_send_mapping,
3324 .is_alive = xfrm_is_alive,
3325 };
3326
3327 static int __net_init xfrm_user_net_init(struct net *net)
3328 {
3329 struct sock *nlsk;
3330 struct netlink_kernel_cfg cfg = {
3331 .groups = XFRMNLGRP_MAX,
3332 .input = xfrm_netlink_rcv,
3333 };
3334
3335 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3336 if (nlsk == NULL)
3337 return -ENOMEM;
3338 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3339 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3340 return 0;
3341 }
3342
3343 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3344 {
3345 struct net *net;
3346 list_for_each_entry(net, net_exit_list, exit_list)
3347 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3348 synchronize_net();
3349 list_for_each_entry(net, net_exit_list, exit_list)
3350 netlink_kernel_release(net->xfrm.nlsk_stash);
3351 }
3352
3353 static struct pernet_operations xfrm_user_net_ops = {
3354 .init = xfrm_user_net_init,
3355 .exit_batch = xfrm_user_net_exit,
3356 };
3357
3358 static int __init xfrm_user_init(void)
3359 {
3360 int rv;
3361
3362 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3363
3364 rv = register_pernet_subsys(&xfrm_user_net_ops);
3365 if (rv < 0)
3366 return rv;
3367 rv = xfrm_register_km(&netlink_mgr);
3368 if (rv < 0)
3369 unregister_pernet_subsys(&xfrm_user_net_ops);
3370 return rv;
3371 }
3372
3373 static void __exit xfrm_user_exit(void)
3374 {
3375 xfrm_unregister_km(&netlink_mgr);
3376 unregister_pernet_subsys(&xfrm_user_net_ops);
3377 }
3378
3379 module_init(xfrm_user_init);
3380 module_exit(xfrm_user_exit);
3381 MODULE_LICENSE("GPL");
3382 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
Linux with added FPC-III support