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[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <linux/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 {
38 struct nlattr *rt = attrs[type];
39 struct xfrm_algo *algp;
40
41 if (!rt)
42 return 0;
43
44 algp = nla_data(rt);
45 if (nla_len(rt) < xfrm_alg_len(algp))
46 return -EINVAL;
47
48 switch (type) {
49 case XFRMA_ALG_AUTH:
50 case XFRMA_ALG_CRYPT:
51 case XFRMA_ALG_COMP:
52 break;
53
54 default:
55 return -EINVAL;
56 }
57
58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
59 return 0;
60 }
61
62 static int verify_auth_trunc(struct nlattr **attrs)
63 {
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
66
67 if (!rt)
68 return 0;
69
70 algp = nla_data(rt);
71 if (nla_len(rt) < xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
75 return 0;
76 }
77
78 static int verify_aead(struct nlattr **attrs)
79 {
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
91 return 0;
92 }
93
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct nlattr *rt = attrs[type];
98
99 if (rt && addrp)
100 *addrp = nla_data(rt);
101 }
102
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 struct xfrm_user_sec_ctx *uctx;
107
108 if (!rt)
109 return 0;
110
111 uctx = nla_data(rt);
112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113 return -EINVAL;
114
115 return 0;
116 }
117
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
120 {
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 struct xfrm_replay_state_esn *rs;
123
124 if (p->flags & XFRM_STATE_ESN) {
125 if (!rt)
126 return -EINVAL;
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) < xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136 }
137
138 if (!rt)
139 return 0;
140
141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
143 return -EINVAL;
144
145 if (p->replay_window != 0)
146 return -EINVAL;
147
148 return 0;
149 }
150
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152 struct nlattr **attrs)
153 {
154 int err;
155
156 err = -EINVAL;
157 switch (p->family) {
158 case AF_INET:
159 break;
160
161 case AF_INET6:
162 #if IS_ENABLED(CONFIG_IPV6)
163 break;
164 #else
165 err = -EAFNOSUPPORT;
166 goto out;
167 #endif
168
169 default:
170 goto out;
171 }
172
173 err = -EINVAL;
174 switch (p->id.proto) {
175 case IPPROTO_AH:
176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178 attrs[XFRMA_ALG_AEAD] ||
179 attrs[XFRMA_ALG_CRYPT] ||
180 attrs[XFRMA_ALG_COMP] ||
181 attrs[XFRMA_TFCPAD])
182 goto out;
183 break;
184
185 case IPPROTO_ESP:
186 if (attrs[XFRMA_ALG_COMP])
187 goto out;
188 if (!attrs[XFRMA_ALG_AUTH] &&
189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if ((attrs[XFRMA_ALG_AUTH] ||
194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
197 goto out;
198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
200 goto out;
201 break;
202
203 case IPPROTO_COMP:
204 if (!attrs[XFRMA_ALG_COMP] ||
205 attrs[XFRMA_ALG_AEAD] ||
206 attrs[XFRMA_ALG_AUTH] ||
207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
208 attrs[XFRMA_ALG_CRYPT] ||
209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
211 goto out;
212 break;
213
214 #if IS_ENABLED(CONFIG_IPV6)
215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
220 attrs[XFRMA_ALG_AEAD] ||
221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
224 attrs[XFRMA_TFCPAD] ||
225 !attrs[XFRMA_COADDR])
226 goto out;
227 break;
228 #endif
229
230 default:
231 goto out;
232 }
233
234 if ((err = verify_aead(attrs)))
235 goto out;
236 if ((err = verify_auth_trunc(attrs)))
237 goto out;
238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243 goto out;
244 if ((err = verify_sec_ctx_len(attrs)))
245 goto out;
246 if ((err = verify_replay(p, attrs)))
247 goto out;
248
249 err = -EINVAL;
250 switch (p->mode) {
251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
253 case XFRM_MODE_ROUTEOPTIMIZATION:
254 case XFRM_MODE_BEET:
255 break;
256
257 default:
258 goto out;
259 }
260
261 err = 0;
262
263 out:
264 return err;
265 }
266
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
269 struct nlattr *rta)
270 {
271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
273
274 if (!rta)
275 return 0;
276
277 ualg = nla_data(rta);
278
279 algo = get_byname(ualg->alg_name, 1);
280 if (!algo)
281 return -ENOSYS;
282 *props = algo->desc.sadb_alg_id;
283
284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
285 if (!p)
286 return -ENOMEM;
287
288 strcpy(p->alg_name, algo->name);
289 *algpp = p;
290 return 0;
291 }
292
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 {
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 x->props.ealgo = algo->desc.sadb_alg_id;
307
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 strcpy(p->alg_name, algo->name);
313 x->ealg = p;
314 x->geniv = algo->uinfo.encr.geniv;
315 return 0;
316 }
317
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319 struct nlattr *rta)
320 {
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
324
325 if (!rta)
326 return 0;
327
328 ualg = nla_data(rta);
329
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331 if (!algo)
332 return -ENOSYS;
333 *props = algo->desc.sadb_alg_id;
334
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336 if (!p)
337 return -ENOMEM;
338
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343
344 *algpp = p;
345 return 0;
346 }
347
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350 {
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
353
354 if (!rta)
355 return 0;
356
357 ualg = nla_data(rta);
358
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360 if (!algo)
361 return -ENOSYS;
362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363 return -EINVAL;
364 *props = algo->desc.sadb_alg_id;
365
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367 if (!p)
368 return -ENOMEM;
369
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373
374 *algpp = p;
375 return 0;
376 }
377
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 {
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
382
383 if (!rta)
384 return 0;
385
386 ualg = nla_data(rta);
387
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389 if (!algo)
390 return -ENOSYS;
391 x->props.ealgo = algo->desc.sadb_alg_id;
392
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394 if (!p)
395 return -ENOMEM;
396
397 strcpy(p->alg_name, algo->name);
398 x->aead = p;
399 x->geniv = algo->uinfo.aead.geniv;
400 return 0;
401 }
402
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404 struct nlattr *rp)
405 {
406 struct xfrm_replay_state_esn *up;
407 int ulen;
408
409 if (!replay_esn || !rp)
410 return 0;
411
412 up = nla_data(rp);
413 ulen = xfrm_replay_state_esn_len(up);
414
415 /* Check the overall length and the internal bitmap length to avoid
416 * potential overflow. */
417 if (nla_len(rp) < ulen ||
418 xfrm_replay_state_esn_len(replay_esn) != ulen ||
419 replay_esn->bmp_len != up->bmp_len)
420 return -EINVAL;
421
422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
423 return -EINVAL;
424
425 return 0;
426 }
427
428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
429 struct xfrm_replay_state_esn **preplay_esn,
430 struct nlattr *rta)
431 {
432 struct xfrm_replay_state_esn *p, *pp, *up;
433 int klen, ulen;
434
435 if (!rta)
436 return 0;
437
438 up = nla_data(rta);
439 klen = xfrm_replay_state_esn_len(up);
440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
441
442 p = kzalloc(klen, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 pp = kzalloc(klen, GFP_KERNEL);
447 if (!pp) {
448 kfree(p);
449 return -ENOMEM;
450 }
451
452 memcpy(p, up, ulen);
453 memcpy(pp, up, ulen);
454
455 *replay_esn = p;
456 *preplay_esn = pp;
457
458 return 0;
459 }
460
461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
462 {
463 int len = 0;
464
465 if (xfrm_ctx) {
466 len += sizeof(struct xfrm_user_sec_ctx);
467 len += xfrm_ctx->ctx_len;
468 }
469 return len;
470 }
471
472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
473 {
474 memcpy(&x->id, &p->id, sizeof(x->id));
475 memcpy(&x->sel, &p->sel, sizeof(x->sel));
476 memcpy(&x->lft, &p->lft, sizeof(x->lft));
477 x->props.mode = p->mode;
478 x->props.replay_window = min_t(unsigned int, p->replay_window,
479 sizeof(x->replay.bitmap) * 8);
480 x->props.reqid = p->reqid;
481 x->props.family = p->family;
482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
483 x->props.flags = p->flags;
484
485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
486 x->sel.family = p->family;
487 }
488
489 /*
490 * someday when pfkey also has support, we could have the code
491 * somehow made shareable and move it to xfrm_state.c - JHS
492 *
493 */
494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
495 int update_esn)
496 {
497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
502
503 if (re) {
504 struct xfrm_replay_state_esn *replay_esn;
505 replay_esn = nla_data(re);
506 memcpy(x->replay_esn, replay_esn,
507 xfrm_replay_state_esn_len(replay_esn));
508 memcpy(x->preplay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
510 }
511
512 if (rp) {
513 struct xfrm_replay_state *replay;
514 replay = nla_data(rp);
515 memcpy(&x->replay, replay, sizeof(*replay));
516 memcpy(&x->preplay, replay, sizeof(*replay));
517 }
518
519 if (lt) {
520 struct xfrm_lifetime_cur *ltime;
521 ltime = nla_data(lt);
522 x->curlft.bytes = ltime->bytes;
523 x->curlft.packets = ltime->packets;
524 x->curlft.add_time = ltime->add_time;
525 x->curlft.use_time = ltime->use_time;
526 }
527
528 if (et)
529 x->replay_maxage = nla_get_u32(et);
530
531 if (rt)
532 x->replay_maxdiff = nla_get_u32(rt);
533 }
534
535 static struct xfrm_state *xfrm_state_construct(struct net *net,
536 struct xfrm_usersa_info *p,
537 struct nlattr **attrs,
538 int *errp)
539 {
540 struct xfrm_state *x = xfrm_state_alloc(net);
541 int err = -ENOMEM;
542
543 if (!x)
544 goto error_no_put;
545
546 copy_from_user_state(x, p);
547
548 if (attrs[XFRMA_SA_EXTRA_FLAGS])
549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
550
551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
552 goto error;
553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
554 attrs[XFRMA_ALG_AUTH_TRUNC])))
555 goto error;
556 if (!x->props.aalgo) {
557 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
558 attrs[XFRMA_ALG_AUTH])))
559 goto error;
560 }
561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
562 goto error;
563 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
564 xfrm_calg_get_byname,
565 attrs[XFRMA_ALG_COMP])))
566 goto error;
567
568 if (attrs[XFRMA_ENCAP]) {
569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
570 sizeof(*x->encap), GFP_KERNEL);
571 if (x->encap == NULL)
572 goto error;
573 }
574
575 if (attrs[XFRMA_TFCPAD])
576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
577
578 if (attrs[XFRMA_COADDR]) {
579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
580 sizeof(*x->coaddr), GFP_KERNEL);
581 if (x->coaddr == NULL)
582 goto error;
583 }
584
585 xfrm_mark_get(attrs, &x->mark);
586
587 err = __xfrm_init_state(x, false);
588 if (err)
589 goto error;
590
591 if (attrs[XFRMA_SEC_CTX]) {
592 err = security_xfrm_state_alloc(x,
593 nla_data(attrs[XFRMA_SEC_CTX]));
594 if (err)
595 goto error;
596 }
597
598 if (attrs[XFRMA_OFFLOAD_DEV]) {
599 err = xfrm_dev_state_add(net, x,
600 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
601 if (err)
602 goto error;
603 }
604
605 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
606 attrs[XFRMA_REPLAY_ESN_VAL])))
607 goto error;
608
609 x->km.seq = p->seq;
610 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
611 /* sysctl_xfrm_aevent_etime is in 100ms units */
612 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
613
614 if ((err = xfrm_init_replay(x)))
615 goto error;
616
617 /* override default values from above */
618 xfrm_update_ae_params(x, attrs, 0);
619
620 return x;
621
622 error:
623 x->km.state = XFRM_STATE_DEAD;
624 xfrm_state_put(x);
625 error_no_put:
626 *errp = err;
627 return NULL;
628 }
629
630 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
631 struct nlattr **attrs)
632 {
633 struct net *net = sock_net(skb->sk);
634 struct xfrm_usersa_info *p = nlmsg_data(nlh);
635 struct xfrm_state *x;
636 int err;
637 struct km_event c;
638
639 err = verify_newsa_info(p, attrs);
640 if (err)
641 return err;
642
643 x = xfrm_state_construct(net, p, attrs, &err);
644 if (!x)
645 return err;
646
647 xfrm_state_hold(x);
648 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
649 err = xfrm_state_add(x);
650 else
651 err = xfrm_state_update(x);
652
653 xfrm_audit_state_add(x, err ? 0 : 1, true);
654
655 if (err < 0) {
656 x->km.state = XFRM_STATE_DEAD;
657 __xfrm_state_put(x);
658 goto out;
659 }
660
661 c.seq = nlh->nlmsg_seq;
662 c.portid = nlh->nlmsg_pid;
663 c.event = nlh->nlmsg_type;
664
665 km_state_notify(x, &c);
666 out:
667 xfrm_state_put(x);
668 return err;
669 }
670
671 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
672 struct xfrm_usersa_id *p,
673 struct nlattr **attrs,
674 int *errp)
675 {
676 struct xfrm_state *x = NULL;
677 struct xfrm_mark m;
678 int err;
679 u32 mark = xfrm_mark_get(attrs, &m);
680
681 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
682 err = -ESRCH;
683 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
684 } else {
685 xfrm_address_t *saddr = NULL;
686
687 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
688 if (!saddr) {
689 err = -EINVAL;
690 goto out;
691 }
692
693 err = -ESRCH;
694 x = xfrm_state_lookup_byaddr(net, mark,
695 &p->daddr, saddr,
696 p->proto, p->family);
697 }
698
699 out:
700 if (!x && errp)
701 *errp = err;
702 return x;
703 }
704
705 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
706 struct nlattr **attrs)
707 {
708 struct net *net = sock_net(skb->sk);
709 struct xfrm_state *x;
710 int err = -ESRCH;
711 struct km_event c;
712 struct xfrm_usersa_id *p = nlmsg_data(nlh);
713
714 x = xfrm_user_state_lookup(net, p, attrs, &err);
715 if (x == NULL)
716 return err;
717
718 if ((err = security_xfrm_state_delete(x)) != 0)
719 goto out;
720
721 if (xfrm_state_kern(x)) {
722 err = -EPERM;
723 goto out;
724 }
725
726 err = xfrm_state_delete(x);
727
728 if (err < 0)
729 goto out;
730
731 c.seq = nlh->nlmsg_seq;
732 c.portid = nlh->nlmsg_pid;
733 c.event = nlh->nlmsg_type;
734 km_state_notify(x, &c);
735
736 out:
737 xfrm_audit_state_delete(x, err ? 0 : 1, true);
738 xfrm_state_put(x);
739 return err;
740 }
741
742 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
743 {
744 memset(p, 0, sizeof(*p));
745 memcpy(&p->id, &x->id, sizeof(p->id));
746 memcpy(&p->sel, &x->sel, sizeof(p->sel));
747 memcpy(&p->lft, &x->lft, sizeof(p->lft));
748 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
749 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
750 put_unaligned(x->stats.replay, &p->stats.replay);
751 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
752 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
753 p->mode = x->props.mode;
754 p->replay_window = x->props.replay_window;
755 p->reqid = x->props.reqid;
756 p->family = x->props.family;
757 p->flags = x->props.flags;
758 p->seq = x->km.seq;
759 }
760
761 struct xfrm_dump_info {
762 struct sk_buff *in_skb;
763 struct sk_buff *out_skb;
764 u32 nlmsg_seq;
765 u16 nlmsg_flags;
766 };
767
768 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
769 {
770 struct xfrm_user_sec_ctx *uctx;
771 struct nlattr *attr;
772 int ctx_size = sizeof(*uctx) + s->ctx_len;
773
774 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
775 if (attr == NULL)
776 return -EMSGSIZE;
777
778 uctx = nla_data(attr);
779 uctx->exttype = XFRMA_SEC_CTX;
780 uctx->len = ctx_size;
781 uctx->ctx_doi = s->ctx_doi;
782 uctx->ctx_alg = s->ctx_alg;
783 uctx->ctx_len = s->ctx_len;
784 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
785
786 return 0;
787 }
788
789 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
790 {
791 struct xfrm_user_offload *xuo;
792 struct nlattr *attr;
793
794 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
795 if (attr == NULL)
796 return -EMSGSIZE;
797
798 xuo = nla_data(attr);
799 memset(xuo, 0, sizeof(*xuo));
800 xuo->ifindex = xso->dev->ifindex;
801 xuo->flags = xso->flags;
802
803 return 0;
804 }
805
806 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
807 {
808 struct xfrm_algo *algo;
809 struct nlattr *nla;
810
811 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
812 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
813 if (!nla)
814 return -EMSGSIZE;
815
816 algo = nla_data(nla);
817 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
818 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
819 algo->alg_key_len = auth->alg_key_len;
820
821 return 0;
822 }
823
824 /* Don't change this without updating xfrm_sa_len! */
825 static int copy_to_user_state_extra(struct xfrm_state *x,
826 struct xfrm_usersa_info *p,
827 struct sk_buff *skb)
828 {
829 int ret = 0;
830
831 copy_to_user_state(x, p);
832
833 if (x->props.extra_flags) {
834 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
835 x->props.extra_flags);
836 if (ret)
837 goto out;
838 }
839
840 if (x->coaddr) {
841 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
842 if (ret)
843 goto out;
844 }
845 if (x->lastused) {
846 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
847 XFRMA_PAD);
848 if (ret)
849 goto out;
850 }
851 if (x->aead) {
852 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
853 if (ret)
854 goto out;
855 }
856 if (x->aalg) {
857 ret = copy_to_user_auth(x->aalg, skb);
858 if (!ret)
859 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
860 xfrm_alg_auth_len(x->aalg), x->aalg);
861 if (ret)
862 goto out;
863 }
864 if (x->ealg) {
865 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
866 if (ret)
867 goto out;
868 }
869 if (x->calg) {
870 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
871 if (ret)
872 goto out;
873 }
874 if (x->encap) {
875 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
876 if (ret)
877 goto out;
878 }
879 if (x->tfcpad) {
880 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
881 if (ret)
882 goto out;
883 }
884 ret = xfrm_mark_put(skb, &x->mark);
885 if (ret)
886 goto out;
887 if (x->replay_esn)
888 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
889 xfrm_replay_state_esn_len(x->replay_esn),
890 x->replay_esn);
891 else
892 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
893 &x->replay);
894 if (ret)
895 goto out;
896 if(x->xso.dev)
897 ret = copy_user_offload(&x->xso, skb);
898 if (ret)
899 goto out;
900 if (x->security)
901 ret = copy_sec_ctx(x->security, skb);
902 out:
903 return ret;
904 }
905
906 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
907 {
908 struct xfrm_dump_info *sp = ptr;
909 struct sk_buff *in_skb = sp->in_skb;
910 struct sk_buff *skb = sp->out_skb;
911 struct xfrm_usersa_info *p;
912 struct nlmsghdr *nlh;
913 int err;
914
915 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
916 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
917 if (nlh == NULL)
918 return -EMSGSIZE;
919
920 p = nlmsg_data(nlh);
921
922 err = copy_to_user_state_extra(x, p, skb);
923 if (err) {
924 nlmsg_cancel(skb, nlh);
925 return err;
926 }
927 nlmsg_end(skb, nlh);
928 return 0;
929 }
930
931 static int xfrm_dump_sa_done(struct netlink_callback *cb)
932 {
933 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
934 struct sock *sk = cb->skb->sk;
935 struct net *net = sock_net(sk);
936
937 if (cb->args[0])
938 xfrm_state_walk_done(walk, net);
939 return 0;
940 }
941
942 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
943 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
944 {
945 struct net *net = sock_net(skb->sk);
946 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
947 struct xfrm_dump_info info;
948
949 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
950 sizeof(cb->args) - sizeof(cb->args[0]));
951
952 info.in_skb = cb->skb;
953 info.out_skb = skb;
954 info.nlmsg_seq = cb->nlh->nlmsg_seq;
955 info.nlmsg_flags = NLM_F_MULTI;
956
957 if (!cb->args[0]) {
958 struct nlattr *attrs[XFRMA_MAX+1];
959 struct xfrm_address_filter *filter = NULL;
960 u8 proto = 0;
961 int err;
962
963 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
964 NULL);
965 if (err < 0)
966 return err;
967
968 if (attrs[XFRMA_ADDRESS_FILTER]) {
969 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
970 sizeof(*filter), GFP_KERNEL);
971 if (filter == NULL)
972 return -ENOMEM;
973 }
974
975 if (attrs[XFRMA_PROTO])
976 proto = nla_get_u8(attrs[XFRMA_PROTO]);
977
978 xfrm_state_walk_init(walk, proto, filter);
979 cb->args[0] = 1;
980 }
981
982 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
983
984 return skb->len;
985 }
986
987 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
988 struct xfrm_state *x, u32 seq)
989 {
990 struct xfrm_dump_info info;
991 struct sk_buff *skb;
992 int err;
993
994 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
995 if (!skb)
996 return ERR_PTR(-ENOMEM);
997
998 info.in_skb = in_skb;
999 info.out_skb = skb;
1000 info.nlmsg_seq = seq;
1001 info.nlmsg_flags = 0;
1002
1003 err = dump_one_state(x, 0, &info);
1004 if (err) {
1005 kfree_skb(skb);
1006 return ERR_PTR(err);
1007 }
1008
1009 return skb;
1010 }
1011
1012 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1013 * Must be called with RCU read lock.
1014 */
1015 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1016 u32 pid, unsigned int group)
1017 {
1018 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1019
1020 if (nlsk)
1021 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1022 else
1023 return -1;
1024 }
1025
1026 static inline size_t xfrm_spdinfo_msgsize(void)
1027 {
1028 return NLMSG_ALIGN(4)
1029 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1030 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1031 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1032 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1033 }
1034
1035 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1036 u32 portid, u32 seq, u32 flags)
1037 {
1038 struct xfrmk_spdinfo si;
1039 struct xfrmu_spdinfo spc;
1040 struct xfrmu_spdhinfo sph;
1041 struct xfrmu_spdhthresh spt4, spt6;
1042 struct nlmsghdr *nlh;
1043 int err;
1044 u32 *f;
1045 unsigned lseq;
1046
1047 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1048 if (nlh == NULL) /* shouldn't really happen ... */
1049 return -EMSGSIZE;
1050
1051 f = nlmsg_data(nlh);
1052 *f = flags;
1053 xfrm_spd_getinfo(net, &si);
1054 spc.incnt = si.incnt;
1055 spc.outcnt = si.outcnt;
1056 spc.fwdcnt = si.fwdcnt;
1057 spc.inscnt = si.inscnt;
1058 spc.outscnt = si.outscnt;
1059 spc.fwdscnt = si.fwdscnt;
1060 sph.spdhcnt = si.spdhcnt;
1061 sph.spdhmcnt = si.spdhmcnt;
1062
1063 do {
1064 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1065
1066 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1067 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1068 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1069 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1070 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1071
1072 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1073 if (!err)
1074 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1075 if (!err)
1076 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1077 if (!err)
1078 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1079 if (err) {
1080 nlmsg_cancel(skb, nlh);
1081 return err;
1082 }
1083
1084 nlmsg_end(skb, nlh);
1085 return 0;
1086 }
1087
1088 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1089 struct nlattr **attrs)
1090 {
1091 struct net *net = sock_net(skb->sk);
1092 struct xfrmu_spdhthresh *thresh4 = NULL;
1093 struct xfrmu_spdhthresh *thresh6 = NULL;
1094
1095 /* selector prefixlen thresholds to hash policies */
1096 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1097 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1098
1099 if (nla_len(rta) < sizeof(*thresh4))
1100 return -EINVAL;
1101 thresh4 = nla_data(rta);
1102 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1103 return -EINVAL;
1104 }
1105 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1106 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1107
1108 if (nla_len(rta) < sizeof(*thresh6))
1109 return -EINVAL;
1110 thresh6 = nla_data(rta);
1111 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1112 return -EINVAL;
1113 }
1114
1115 if (thresh4 || thresh6) {
1116 write_seqlock(&net->xfrm.policy_hthresh.lock);
1117 if (thresh4) {
1118 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1119 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1120 }
1121 if (thresh6) {
1122 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1123 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1124 }
1125 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1126
1127 xfrm_policy_hash_rebuild(net);
1128 }
1129
1130 return 0;
1131 }
1132
1133 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1134 struct nlattr **attrs)
1135 {
1136 struct net *net = sock_net(skb->sk);
1137 struct sk_buff *r_skb;
1138 u32 *flags = nlmsg_data(nlh);
1139 u32 sportid = NETLINK_CB(skb).portid;
1140 u32 seq = nlh->nlmsg_seq;
1141
1142 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1143 if (r_skb == NULL)
1144 return -ENOMEM;
1145
1146 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1147 BUG();
1148
1149 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1150 }
1151
1152 static inline size_t xfrm_sadinfo_msgsize(void)
1153 {
1154 return NLMSG_ALIGN(4)
1155 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1156 + nla_total_size(4); /* XFRMA_SAD_CNT */
1157 }
1158
1159 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1160 u32 portid, u32 seq, u32 flags)
1161 {
1162 struct xfrmk_sadinfo si;
1163 struct xfrmu_sadhinfo sh;
1164 struct nlmsghdr *nlh;
1165 int err;
1166 u32 *f;
1167
1168 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1169 if (nlh == NULL) /* shouldn't really happen ... */
1170 return -EMSGSIZE;
1171
1172 f = nlmsg_data(nlh);
1173 *f = flags;
1174 xfrm_sad_getinfo(net, &si);
1175
1176 sh.sadhmcnt = si.sadhmcnt;
1177 sh.sadhcnt = si.sadhcnt;
1178
1179 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1180 if (!err)
1181 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1182 if (err) {
1183 nlmsg_cancel(skb, nlh);
1184 return err;
1185 }
1186
1187 nlmsg_end(skb, nlh);
1188 return 0;
1189 }
1190
1191 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1192 struct nlattr **attrs)
1193 {
1194 struct net *net = sock_net(skb->sk);
1195 struct sk_buff *r_skb;
1196 u32 *flags = nlmsg_data(nlh);
1197 u32 sportid = NETLINK_CB(skb).portid;
1198 u32 seq = nlh->nlmsg_seq;
1199
1200 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1201 if (r_skb == NULL)
1202 return -ENOMEM;
1203
1204 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1205 BUG();
1206
1207 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1208 }
1209
1210 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1211 struct nlattr **attrs)
1212 {
1213 struct net *net = sock_net(skb->sk);
1214 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1215 struct xfrm_state *x;
1216 struct sk_buff *resp_skb;
1217 int err = -ESRCH;
1218
1219 x = xfrm_user_state_lookup(net, p, attrs, &err);
1220 if (x == NULL)
1221 goto out_noput;
1222
1223 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1224 if (IS_ERR(resp_skb)) {
1225 err = PTR_ERR(resp_skb);
1226 } else {
1227 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1228 }
1229 xfrm_state_put(x);
1230 out_noput:
1231 return err;
1232 }
1233
1234 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1235 struct nlattr **attrs)
1236 {
1237 struct net *net = sock_net(skb->sk);
1238 struct xfrm_state *x;
1239 struct xfrm_userspi_info *p;
1240 struct sk_buff *resp_skb;
1241 xfrm_address_t *daddr;
1242 int family;
1243 int err;
1244 u32 mark;
1245 struct xfrm_mark m;
1246
1247 p = nlmsg_data(nlh);
1248 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1249 if (err)
1250 goto out_noput;
1251
1252 family = p->info.family;
1253 daddr = &p->info.id.daddr;
1254
1255 x = NULL;
1256
1257 mark = xfrm_mark_get(attrs, &m);
1258 if (p->info.seq) {
1259 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1260 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1261 xfrm_state_put(x);
1262 x = NULL;
1263 }
1264 }
1265
1266 if (!x)
1267 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1268 p->info.id.proto, daddr,
1269 &p->info.saddr, 1,
1270 family);
1271 err = -ENOENT;
1272 if (x == NULL)
1273 goto out_noput;
1274
1275 err = xfrm_alloc_spi(x, p->min, p->max);
1276 if (err)
1277 goto out;
1278
1279 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1280 if (IS_ERR(resp_skb)) {
1281 err = PTR_ERR(resp_skb);
1282 goto out;
1283 }
1284
1285 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1286
1287 out:
1288 xfrm_state_put(x);
1289 out_noput:
1290 return err;
1291 }
1292
1293 static int verify_policy_dir(u8 dir)
1294 {
1295 switch (dir) {
1296 case XFRM_POLICY_IN:
1297 case XFRM_POLICY_OUT:
1298 case XFRM_POLICY_FWD:
1299 break;
1300
1301 default:
1302 return -EINVAL;
1303 }
1304
1305 return 0;
1306 }
1307
1308 static int verify_policy_type(u8 type)
1309 {
1310 switch (type) {
1311 case XFRM_POLICY_TYPE_MAIN:
1312 #ifdef CONFIG_XFRM_SUB_POLICY
1313 case XFRM_POLICY_TYPE_SUB:
1314 #endif
1315 break;
1316
1317 default:
1318 return -EINVAL;
1319 }
1320
1321 return 0;
1322 }
1323
1324 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1325 {
1326 int ret;
1327
1328 switch (p->share) {
1329 case XFRM_SHARE_ANY:
1330 case XFRM_SHARE_SESSION:
1331 case XFRM_SHARE_USER:
1332 case XFRM_SHARE_UNIQUE:
1333 break;
1334
1335 default:
1336 return -EINVAL;
1337 }
1338
1339 switch (p->action) {
1340 case XFRM_POLICY_ALLOW:
1341 case XFRM_POLICY_BLOCK:
1342 break;
1343
1344 default:
1345 return -EINVAL;
1346 }
1347
1348 switch (p->sel.family) {
1349 case AF_INET:
1350 break;
1351
1352 case AF_INET6:
1353 #if IS_ENABLED(CONFIG_IPV6)
1354 break;
1355 #else
1356 return -EAFNOSUPPORT;
1357 #endif
1358
1359 default:
1360 return -EINVAL;
1361 }
1362
1363 ret = verify_policy_dir(p->dir);
1364 if (ret)
1365 return ret;
1366 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1367 return -EINVAL;
1368
1369 return 0;
1370 }
1371
1372 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1373 {
1374 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1375 struct xfrm_user_sec_ctx *uctx;
1376
1377 if (!rt)
1378 return 0;
1379
1380 uctx = nla_data(rt);
1381 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1382 }
1383
1384 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1385 int nr)
1386 {
1387 int i;
1388
1389 xp->xfrm_nr = nr;
1390 for (i = 0; i < nr; i++, ut++) {
1391 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1392
1393 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1394 memcpy(&t->saddr, &ut->saddr,
1395 sizeof(xfrm_address_t));
1396 t->reqid = ut->reqid;
1397 t->mode = ut->mode;
1398 t->share = ut->share;
1399 t->optional = ut->optional;
1400 t->aalgos = ut->aalgos;
1401 t->ealgos = ut->ealgos;
1402 t->calgos = ut->calgos;
1403 /* If all masks are ~0, then we allow all algorithms. */
1404 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1405 t->encap_family = ut->family;
1406 }
1407 }
1408
1409 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1410 {
1411 int i;
1412
1413 if (nr > XFRM_MAX_DEPTH)
1414 return -EINVAL;
1415
1416 for (i = 0; i < nr; i++) {
1417 /* We never validated the ut->family value, so many
1418 * applications simply leave it at zero. The check was
1419 * never made and ut->family was ignored because all
1420 * templates could be assumed to have the same family as
1421 * the policy itself. Now that we will have ipv4-in-ipv6
1422 * and ipv6-in-ipv4 tunnels, this is no longer true.
1423 */
1424 if (!ut[i].family)
1425 ut[i].family = family;
1426
1427 switch (ut[i].family) {
1428 case AF_INET:
1429 break;
1430 #if IS_ENABLED(CONFIG_IPV6)
1431 case AF_INET6:
1432 break;
1433 #endif
1434 default:
1435 return -EINVAL;
1436 }
1437 }
1438
1439 return 0;
1440 }
1441
1442 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1443 {
1444 struct nlattr *rt = attrs[XFRMA_TMPL];
1445
1446 if (!rt) {
1447 pol->xfrm_nr = 0;
1448 } else {
1449 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1450 int nr = nla_len(rt) / sizeof(*utmpl);
1451 int err;
1452
1453 err = validate_tmpl(nr, utmpl, pol->family);
1454 if (err)
1455 return err;
1456
1457 copy_templates(pol, utmpl, nr);
1458 }
1459 return 0;
1460 }
1461
1462 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1463 {
1464 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1465 struct xfrm_userpolicy_type *upt;
1466 u8 type = XFRM_POLICY_TYPE_MAIN;
1467 int err;
1468
1469 if (rt) {
1470 upt = nla_data(rt);
1471 type = upt->type;
1472 }
1473
1474 err = verify_policy_type(type);
1475 if (err)
1476 return err;
1477
1478 *tp = type;
1479 return 0;
1480 }
1481
1482 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1483 {
1484 xp->priority = p->priority;
1485 xp->index = p->index;
1486 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1487 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1488 xp->action = p->action;
1489 xp->flags = p->flags;
1490 xp->family = p->sel.family;
1491 /* XXX xp->share = p->share; */
1492 }
1493
1494 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1495 {
1496 memset(p, 0, sizeof(*p));
1497 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1498 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1499 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1500 p->priority = xp->priority;
1501 p->index = xp->index;
1502 p->sel.family = xp->family;
1503 p->dir = dir;
1504 p->action = xp->action;
1505 p->flags = xp->flags;
1506 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1507 }
1508
1509 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1510 {
1511 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1512 int err;
1513
1514 if (!xp) {
1515 *errp = -ENOMEM;
1516 return NULL;
1517 }
1518
1519 copy_from_user_policy(xp, p);
1520
1521 err = copy_from_user_policy_type(&xp->type, attrs);
1522 if (err)
1523 goto error;
1524
1525 if (!(err = copy_from_user_tmpl(xp, attrs)))
1526 err = copy_from_user_sec_ctx(xp, attrs);
1527 if (err)
1528 goto error;
1529
1530 xfrm_mark_get(attrs, &xp->mark);
1531
1532 return xp;
1533 error:
1534 *errp = err;
1535 xp->walk.dead = 1;
1536 xfrm_policy_destroy(xp);
1537 return NULL;
1538 }
1539
1540 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1541 struct nlattr **attrs)
1542 {
1543 struct net *net = sock_net(skb->sk);
1544 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1545 struct xfrm_policy *xp;
1546 struct km_event c;
1547 int err;
1548 int excl;
1549
1550 err = verify_newpolicy_info(p);
1551 if (err)
1552 return err;
1553 err = verify_sec_ctx_len(attrs);
1554 if (err)
1555 return err;
1556
1557 xp = xfrm_policy_construct(net, p, attrs, &err);
1558 if (!xp)
1559 return err;
1560
1561 /* shouldn't excl be based on nlh flags??
1562 * Aha! this is anti-netlink really i.e more pfkey derived
1563 * in netlink excl is a flag and you wouldnt need
1564 * a type XFRM_MSG_UPDPOLICY - JHS */
1565 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1566 err = xfrm_policy_insert(p->dir, xp, excl);
1567 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1568
1569 if (err) {
1570 security_xfrm_policy_free(xp->security);
1571 kfree(xp);
1572 return err;
1573 }
1574
1575 c.event = nlh->nlmsg_type;
1576 c.seq = nlh->nlmsg_seq;
1577 c.portid = nlh->nlmsg_pid;
1578 km_policy_notify(xp, p->dir, &c);
1579
1580 xfrm_pol_put(xp);
1581
1582 return 0;
1583 }
1584
1585 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1586 {
1587 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1588 int i;
1589
1590 if (xp->xfrm_nr == 0)
1591 return 0;
1592
1593 for (i = 0; i < xp->xfrm_nr; i++) {
1594 struct xfrm_user_tmpl *up = &vec[i];
1595 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1596
1597 memset(up, 0, sizeof(*up));
1598 memcpy(&up->id, &kp->id, sizeof(up->id));
1599 up->family = kp->encap_family;
1600 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1601 up->reqid = kp->reqid;
1602 up->mode = kp->mode;
1603 up->share = kp->share;
1604 up->optional = kp->optional;
1605 up->aalgos = kp->aalgos;
1606 up->ealgos = kp->ealgos;
1607 up->calgos = kp->calgos;
1608 }
1609
1610 return nla_put(skb, XFRMA_TMPL,
1611 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1612 }
1613
1614 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1615 {
1616 if (x->security) {
1617 return copy_sec_ctx(x->security, skb);
1618 }
1619 return 0;
1620 }
1621
1622 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1623 {
1624 if (xp->security)
1625 return copy_sec_ctx(xp->security, skb);
1626 return 0;
1627 }
1628 static inline size_t userpolicy_type_attrsize(void)
1629 {
1630 #ifdef CONFIG_XFRM_SUB_POLICY
1631 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1632 #else
1633 return 0;
1634 #endif
1635 }
1636
1637 #ifdef CONFIG_XFRM_SUB_POLICY
1638 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1639 {
1640 struct xfrm_userpolicy_type upt = {
1641 .type = type,
1642 };
1643
1644 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1645 }
1646
1647 #else
1648 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1649 {
1650 return 0;
1651 }
1652 #endif
1653
1654 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1655 {
1656 struct xfrm_dump_info *sp = ptr;
1657 struct xfrm_userpolicy_info *p;
1658 struct sk_buff *in_skb = sp->in_skb;
1659 struct sk_buff *skb = sp->out_skb;
1660 struct nlmsghdr *nlh;
1661 int err;
1662
1663 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1664 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1665 if (nlh == NULL)
1666 return -EMSGSIZE;
1667
1668 p = nlmsg_data(nlh);
1669 copy_to_user_policy(xp, p, dir);
1670 err = copy_to_user_tmpl(xp, skb);
1671 if (!err)
1672 err = copy_to_user_sec_ctx(xp, skb);
1673 if (!err)
1674 err = copy_to_user_policy_type(xp->type, skb);
1675 if (!err)
1676 err = xfrm_mark_put(skb, &xp->mark);
1677 if (err) {
1678 nlmsg_cancel(skb, nlh);
1679 return err;
1680 }
1681 nlmsg_end(skb, nlh);
1682 return 0;
1683 }
1684
1685 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1686 {
1687 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1688 struct net *net = sock_net(cb->skb->sk);
1689
1690 xfrm_policy_walk_done(walk, net);
1691 return 0;
1692 }
1693
1694 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1695 {
1696 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1697
1698 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1699
1700 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1701 return 0;
1702 }
1703
1704 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1705 {
1706 struct net *net = sock_net(skb->sk);
1707 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1708 struct xfrm_dump_info info;
1709
1710 info.in_skb = cb->skb;
1711 info.out_skb = skb;
1712 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1713 info.nlmsg_flags = NLM_F_MULTI;
1714
1715 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1716
1717 return skb->len;
1718 }
1719
1720 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1721 struct xfrm_policy *xp,
1722 int dir, u32 seq)
1723 {
1724 struct xfrm_dump_info info;
1725 struct sk_buff *skb;
1726 int err;
1727
1728 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1729 if (!skb)
1730 return ERR_PTR(-ENOMEM);
1731
1732 info.in_skb = in_skb;
1733 info.out_skb = skb;
1734 info.nlmsg_seq = seq;
1735 info.nlmsg_flags = 0;
1736
1737 err = dump_one_policy(xp, dir, 0, &info);
1738 if (err) {
1739 kfree_skb(skb);
1740 return ERR_PTR(err);
1741 }
1742
1743 return skb;
1744 }
1745
1746 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1747 struct nlattr **attrs)
1748 {
1749 struct net *net = sock_net(skb->sk);
1750 struct xfrm_policy *xp;
1751 struct xfrm_userpolicy_id *p;
1752 u8 type = XFRM_POLICY_TYPE_MAIN;
1753 int err;
1754 struct km_event c;
1755 int delete;
1756 struct xfrm_mark m;
1757 u32 mark = xfrm_mark_get(attrs, &m);
1758
1759 p = nlmsg_data(nlh);
1760 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1761
1762 err = copy_from_user_policy_type(&type, attrs);
1763 if (err)
1764 return err;
1765
1766 err = verify_policy_dir(p->dir);
1767 if (err)
1768 return err;
1769
1770 if (p->index)
1771 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1772 else {
1773 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1774 struct xfrm_sec_ctx *ctx;
1775
1776 err = verify_sec_ctx_len(attrs);
1777 if (err)
1778 return err;
1779
1780 ctx = NULL;
1781 if (rt) {
1782 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1783
1784 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1785 if (err)
1786 return err;
1787 }
1788 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1789 ctx, delete, &err);
1790 security_xfrm_policy_free(ctx);
1791 }
1792 if (xp == NULL)
1793 return -ENOENT;
1794
1795 if (!delete) {
1796 struct sk_buff *resp_skb;
1797
1798 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1799 if (IS_ERR(resp_skb)) {
1800 err = PTR_ERR(resp_skb);
1801 } else {
1802 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1803 NETLINK_CB(skb).portid);
1804 }
1805 } else {
1806 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1807
1808 if (err != 0)
1809 goto out;
1810
1811 c.data.byid = p->index;
1812 c.event = nlh->nlmsg_type;
1813 c.seq = nlh->nlmsg_seq;
1814 c.portid = nlh->nlmsg_pid;
1815 km_policy_notify(xp, p->dir, &c);
1816 }
1817
1818 out:
1819 xfrm_pol_put(xp);
1820 if (delete && err == 0)
1821 xfrm_garbage_collect(net);
1822 return err;
1823 }
1824
1825 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1826 struct nlattr **attrs)
1827 {
1828 struct net *net = sock_net(skb->sk);
1829 struct km_event c;
1830 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1831 int err;
1832
1833 err = xfrm_state_flush(net, p->proto, true);
1834 if (err) {
1835 if (err == -ESRCH) /* empty table */
1836 return 0;
1837 return err;
1838 }
1839 c.data.proto = p->proto;
1840 c.event = nlh->nlmsg_type;
1841 c.seq = nlh->nlmsg_seq;
1842 c.portid = nlh->nlmsg_pid;
1843 c.net = net;
1844 km_state_notify(NULL, &c);
1845
1846 return 0;
1847 }
1848
1849 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1850 {
1851 size_t replay_size = x->replay_esn ?
1852 xfrm_replay_state_esn_len(x->replay_esn) :
1853 sizeof(struct xfrm_replay_state);
1854
1855 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1856 + nla_total_size(replay_size)
1857 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1858 + nla_total_size(sizeof(struct xfrm_mark))
1859 + nla_total_size(4) /* XFRM_AE_RTHR */
1860 + nla_total_size(4); /* XFRM_AE_ETHR */
1861 }
1862
1863 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1864 {
1865 struct xfrm_aevent_id *id;
1866 struct nlmsghdr *nlh;
1867 int err;
1868
1869 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1870 if (nlh == NULL)
1871 return -EMSGSIZE;
1872
1873 id = nlmsg_data(nlh);
1874 memset(&id->sa_id, 0, sizeof(id->sa_id));
1875 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1876 id->sa_id.spi = x->id.spi;
1877 id->sa_id.family = x->props.family;
1878 id->sa_id.proto = x->id.proto;
1879 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1880 id->reqid = x->props.reqid;
1881 id->flags = c->data.aevent;
1882
1883 if (x->replay_esn) {
1884 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1885 xfrm_replay_state_esn_len(x->replay_esn),
1886 x->replay_esn);
1887 } else {
1888 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1889 &x->replay);
1890 }
1891 if (err)
1892 goto out_cancel;
1893 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1894 XFRMA_PAD);
1895 if (err)
1896 goto out_cancel;
1897
1898 if (id->flags & XFRM_AE_RTHR) {
1899 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1900 if (err)
1901 goto out_cancel;
1902 }
1903 if (id->flags & XFRM_AE_ETHR) {
1904 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1905 x->replay_maxage * 10 / HZ);
1906 if (err)
1907 goto out_cancel;
1908 }
1909 err = xfrm_mark_put(skb, &x->mark);
1910 if (err)
1911 goto out_cancel;
1912
1913 nlmsg_end(skb, nlh);
1914 return 0;
1915
1916 out_cancel:
1917 nlmsg_cancel(skb, nlh);
1918 return err;
1919 }
1920
1921 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1922 struct nlattr **attrs)
1923 {
1924 struct net *net = sock_net(skb->sk);
1925 struct xfrm_state *x;
1926 struct sk_buff *r_skb;
1927 int err;
1928 struct km_event c;
1929 u32 mark;
1930 struct xfrm_mark m;
1931 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1932 struct xfrm_usersa_id *id = &p->sa_id;
1933
1934 mark = xfrm_mark_get(attrs, &m);
1935
1936 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1937 if (x == NULL)
1938 return -ESRCH;
1939
1940 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1941 if (r_skb == NULL) {
1942 xfrm_state_put(x);
1943 return -ENOMEM;
1944 }
1945
1946 /*
1947 * XXX: is this lock really needed - none of the other
1948 * gets lock (the concern is things getting updated
1949 * while we are still reading) - jhs
1950 */
1951 spin_lock_bh(&x->lock);
1952 c.data.aevent = p->flags;
1953 c.seq = nlh->nlmsg_seq;
1954 c.portid = nlh->nlmsg_pid;
1955
1956 if (build_aevent(r_skb, x, &c) < 0)
1957 BUG();
1958 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1959 spin_unlock_bh(&x->lock);
1960 xfrm_state_put(x);
1961 return err;
1962 }
1963
1964 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1965 struct nlattr **attrs)
1966 {
1967 struct net *net = sock_net(skb->sk);
1968 struct xfrm_state *x;
1969 struct km_event c;
1970 int err = -EINVAL;
1971 u32 mark = 0;
1972 struct xfrm_mark m;
1973 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1974 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1975 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1976 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1977 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1978 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1979
1980 if (!lt && !rp && !re && !et && !rt)
1981 return err;
1982
1983 /* pedantic mode - thou shalt sayeth replaceth */
1984 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1985 return err;
1986
1987 mark = xfrm_mark_get(attrs, &m);
1988
1989 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1990 if (x == NULL)
1991 return -ESRCH;
1992
1993 if (x->km.state != XFRM_STATE_VALID)
1994 goto out;
1995
1996 err = xfrm_replay_verify_len(x->replay_esn, re);
1997 if (err)
1998 goto out;
1999
2000 spin_lock_bh(&x->lock);
2001 xfrm_update_ae_params(x, attrs, 1);
2002 spin_unlock_bh(&x->lock);
2003
2004 c.event = nlh->nlmsg_type;
2005 c.seq = nlh->nlmsg_seq;
2006 c.portid = nlh->nlmsg_pid;
2007 c.data.aevent = XFRM_AE_CU;
2008 km_state_notify(x, &c);
2009 err = 0;
2010 out:
2011 xfrm_state_put(x);
2012 return err;
2013 }
2014
2015 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2016 struct nlattr **attrs)
2017 {
2018 struct net *net = sock_net(skb->sk);
2019 struct km_event c;
2020 u8 type = XFRM_POLICY_TYPE_MAIN;
2021 int err;
2022
2023 err = copy_from_user_policy_type(&type, attrs);
2024 if (err)
2025 return err;
2026
2027 err = xfrm_policy_flush(net, type, true);
2028 if (err) {
2029 if (err == -ESRCH) /* empty table */
2030 return 0;
2031 return err;
2032 }
2033 xfrm_garbage_collect(net);
2034
2035 c.data.type = type;
2036 c.event = nlh->nlmsg_type;
2037 c.seq = nlh->nlmsg_seq;
2038 c.portid = nlh->nlmsg_pid;
2039 c.net = net;
2040 km_policy_notify(NULL, 0, &c);
2041 return 0;
2042 }
2043
2044 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2045 struct nlattr **attrs)
2046 {
2047 struct net *net = sock_net(skb->sk);
2048 struct xfrm_policy *xp;
2049 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2050 struct xfrm_userpolicy_info *p = &up->pol;
2051 u8 type = XFRM_POLICY_TYPE_MAIN;
2052 int err = -ENOENT;
2053 struct xfrm_mark m;
2054 u32 mark = xfrm_mark_get(attrs, &m);
2055
2056 err = copy_from_user_policy_type(&type, attrs);
2057 if (err)
2058 return err;
2059
2060 err = verify_policy_dir(p->dir);
2061 if (err)
2062 return err;
2063
2064 if (p->index)
2065 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2066 else {
2067 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2068 struct xfrm_sec_ctx *ctx;
2069
2070 err = verify_sec_ctx_len(attrs);
2071 if (err)
2072 return err;
2073
2074 ctx = NULL;
2075 if (rt) {
2076 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2077
2078 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2079 if (err)
2080 return err;
2081 }
2082 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2083 &p->sel, ctx, 0, &err);
2084 security_xfrm_policy_free(ctx);
2085 }
2086 if (xp == NULL)
2087 return -ENOENT;
2088
2089 if (unlikely(xp->walk.dead))
2090 goto out;
2091
2092 err = 0;
2093 if (up->hard) {
2094 xfrm_policy_delete(xp, p->dir);
2095 xfrm_audit_policy_delete(xp, 1, true);
2096 }
2097 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2098
2099 out:
2100 xfrm_pol_put(xp);
2101 return err;
2102 }
2103
2104 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2105 struct nlattr **attrs)
2106 {
2107 struct net *net = sock_net(skb->sk);
2108 struct xfrm_state *x;
2109 int err;
2110 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2111 struct xfrm_usersa_info *p = &ue->state;
2112 struct xfrm_mark m;
2113 u32 mark = xfrm_mark_get(attrs, &m);
2114
2115 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2116
2117 err = -ENOENT;
2118 if (x == NULL)
2119 return err;
2120
2121 spin_lock_bh(&x->lock);
2122 err = -EINVAL;
2123 if (x->km.state != XFRM_STATE_VALID)
2124 goto out;
2125 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2126
2127 if (ue->hard) {
2128 __xfrm_state_delete(x);
2129 xfrm_audit_state_delete(x, 1, true);
2130 }
2131 err = 0;
2132 out:
2133 spin_unlock_bh(&x->lock);
2134 xfrm_state_put(x);
2135 return err;
2136 }
2137
2138 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2139 struct nlattr **attrs)
2140 {
2141 struct net *net = sock_net(skb->sk);
2142 struct xfrm_policy *xp;
2143 struct xfrm_user_tmpl *ut;
2144 int i;
2145 struct nlattr *rt = attrs[XFRMA_TMPL];
2146 struct xfrm_mark mark;
2147
2148 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2149 struct xfrm_state *x = xfrm_state_alloc(net);
2150 int err = -ENOMEM;
2151
2152 if (!x)
2153 goto nomem;
2154
2155 xfrm_mark_get(attrs, &mark);
2156
2157 err = verify_newpolicy_info(&ua->policy);
2158 if (err)
2159 goto free_state;
2160
2161 /* build an XP */
2162 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2163 if (!xp)
2164 goto free_state;
2165
2166 memcpy(&x->id, &ua->id, sizeof(ua->id));
2167 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2168 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2169 xp->mark.m = x->mark.m = mark.m;
2170 xp->mark.v = x->mark.v = mark.v;
2171 ut = nla_data(rt);
2172 /* extract the templates and for each call km_key */
2173 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2174 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2175 memcpy(&x->id, &t->id, sizeof(x->id));
2176 x->props.mode = t->mode;
2177 x->props.reqid = t->reqid;
2178 x->props.family = ut->family;
2179 t->aalgos = ua->aalgos;
2180 t->ealgos = ua->ealgos;
2181 t->calgos = ua->calgos;
2182 err = km_query(x, t, xp);
2183
2184 }
2185
2186 kfree(x);
2187 kfree(xp);
2188
2189 return 0;
2190
2191 free_state:
2192 kfree(x);
2193 nomem:
2194 return err;
2195 }
2196
2197 #ifdef CONFIG_XFRM_MIGRATE
2198 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2199 struct xfrm_kmaddress *k,
2200 struct nlattr **attrs, int *num)
2201 {
2202 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2203 struct xfrm_user_migrate *um;
2204 int i, num_migrate;
2205
2206 if (k != NULL) {
2207 struct xfrm_user_kmaddress *uk;
2208
2209 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2210 memcpy(&k->local, &uk->local, sizeof(k->local));
2211 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2212 k->family = uk->family;
2213 k->reserved = uk->reserved;
2214 }
2215
2216 um = nla_data(rt);
2217 num_migrate = nla_len(rt) / sizeof(*um);
2218
2219 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2220 return -EINVAL;
2221
2222 for (i = 0; i < num_migrate; i++, um++, ma++) {
2223 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2224 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2225 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2226 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2227
2228 ma->proto = um->proto;
2229 ma->mode = um->mode;
2230 ma->reqid = um->reqid;
2231
2232 ma->old_family = um->old_family;
2233 ma->new_family = um->new_family;
2234 }
2235
2236 *num = i;
2237 return 0;
2238 }
2239
2240 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2241 struct nlattr **attrs)
2242 {
2243 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2244 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2245 struct xfrm_kmaddress km, *kmp;
2246 u8 type;
2247 int err;
2248 int n = 0;
2249 struct net *net = sock_net(skb->sk);
2250 struct xfrm_encap_tmpl *encap = NULL;
2251
2252 if (attrs[XFRMA_MIGRATE] == NULL)
2253 return -EINVAL;
2254
2255 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2256
2257 err = copy_from_user_policy_type(&type, attrs);
2258 if (err)
2259 return err;
2260
2261 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2262 if (err)
2263 return err;
2264
2265 if (!n)
2266 return 0;
2267
2268 if (attrs[XFRMA_ENCAP]) {
2269 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2270 sizeof(*encap), GFP_KERNEL);
2271 if (!encap)
2272 return 0;
2273 }
2274
2275 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2276
2277 kfree(encap);
2278
2279 return err;
2280 }
2281 #else
2282 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2283 struct nlattr **attrs)
2284 {
2285 return -ENOPROTOOPT;
2286 }
2287 #endif
2288
2289 #ifdef CONFIG_XFRM_MIGRATE
2290 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2291 {
2292 struct xfrm_user_migrate um;
2293
2294 memset(&um, 0, sizeof(um));
2295 um.proto = m->proto;
2296 um.mode = m->mode;
2297 um.reqid = m->reqid;
2298 um.old_family = m->old_family;
2299 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2300 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2301 um.new_family = m->new_family;
2302 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2303 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2304
2305 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2306 }
2307
2308 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2309 {
2310 struct xfrm_user_kmaddress uk;
2311
2312 memset(&uk, 0, sizeof(uk));
2313 uk.family = k->family;
2314 uk.reserved = k->reserved;
2315 memcpy(&uk.local, &k->local, sizeof(uk.local));
2316 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2317
2318 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2319 }
2320
2321 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma,
2322 int with_encp)
2323 {
2324 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2325 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2326 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2327 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2328 + userpolicy_type_attrsize();
2329 }
2330
2331 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2332 int num_migrate, const struct xfrm_kmaddress *k,
2333 const struct xfrm_selector *sel,
2334 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2335 {
2336 const struct xfrm_migrate *mp;
2337 struct xfrm_userpolicy_id *pol_id;
2338 struct nlmsghdr *nlh;
2339 int i, err;
2340
2341 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2342 if (nlh == NULL)
2343 return -EMSGSIZE;
2344
2345 pol_id = nlmsg_data(nlh);
2346 /* copy data from selector, dir, and type to the pol_id */
2347 memset(pol_id, 0, sizeof(*pol_id));
2348 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2349 pol_id->dir = dir;
2350
2351 if (k != NULL) {
2352 err = copy_to_user_kmaddress(k, skb);
2353 if (err)
2354 goto out_cancel;
2355 }
2356 if (encap) {
2357 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2358 if (err)
2359 goto out_cancel;
2360 }
2361 err = copy_to_user_policy_type(type, skb);
2362 if (err)
2363 goto out_cancel;
2364 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2365 err = copy_to_user_migrate(mp, skb);
2366 if (err)
2367 goto out_cancel;
2368 }
2369
2370 nlmsg_end(skb, nlh);
2371 return 0;
2372
2373 out_cancel:
2374 nlmsg_cancel(skb, nlh);
2375 return err;
2376 }
2377
2378 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2379 const struct xfrm_migrate *m, int num_migrate,
2380 const struct xfrm_kmaddress *k,
2381 const struct xfrm_encap_tmpl *encap)
2382 {
2383 struct net *net = &init_net;
2384 struct sk_buff *skb;
2385
2386 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2387 GFP_ATOMIC);
2388 if (skb == NULL)
2389 return -ENOMEM;
2390
2391 /* build migrate */
2392 if (build_migrate(skb, m, num_migrate, k, sel, encap, dir, type) < 0)
2393 BUG();
2394
2395 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2396 }
2397 #else
2398 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2399 const struct xfrm_migrate *m, int num_migrate,
2400 const struct xfrm_kmaddress *k,
2401 const struct xfrm_encap_tmpl *encap)
2402 {
2403 return -ENOPROTOOPT;
2404 }
2405 #endif
2406
2407 #define XMSGSIZE(type) sizeof(struct type)
2408
2409 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2410 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2411 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2412 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2413 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2414 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2415 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2416 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2417 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2418 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2419 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2420 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2421 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2422 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2423 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2424 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2425 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2426 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2427 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2428 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2429 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2430 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2431 };
2432
2433 #undef XMSGSIZE
2434
2435 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2436 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2437 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2438 [XFRMA_LASTUSED] = { .type = NLA_U64},
2439 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2440 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2441 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2442 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2443 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2444 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2445 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2446 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2447 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2448 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2449 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2450 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2451 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2452 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2453 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2454 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2455 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2456 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2457 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2458 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2459 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2460 [XFRMA_PROTO] = { .type = NLA_U8 },
2461 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2462 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2463 };
2464
2465 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2466 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2467 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2468 };
2469
2470 static const struct xfrm_link {
2471 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2472 int (*start)(struct netlink_callback *);
2473 int (*dump)(struct sk_buff *, struct netlink_callback *);
2474 int (*done)(struct netlink_callback *);
2475 const struct nla_policy *nla_pol;
2476 int nla_max;
2477 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2478 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2479 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2480 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2481 .dump = xfrm_dump_sa,
2482 .done = xfrm_dump_sa_done },
2483 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2484 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2485 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2486 .start = xfrm_dump_policy_start,
2487 .dump = xfrm_dump_policy,
2488 .done = xfrm_dump_policy_done },
2489 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2490 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2491 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2492 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2493 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2494 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2495 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2496 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2497 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2498 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2499 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2500 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2501 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2502 .nla_pol = xfrma_spd_policy,
2503 .nla_max = XFRMA_SPD_MAX },
2504 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2505 };
2506
2507 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2508 struct netlink_ext_ack *extack)
2509 {
2510 struct net *net = sock_net(skb->sk);
2511 struct nlattr *attrs[XFRMA_MAX+1];
2512 const struct xfrm_link *link;
2513 int type, err;
2514
2515 #ifdef CONFIG_COMPAT
2516 if (in_compat_syscall())
2517 return -EOPNOTSUPP;
2518 #endif
2519
2520 type = nlh->nlmsg_type;
2521 if (type > XFRM_MSG_MAX)
2522 return -EINVAL;
2523
2524 type -= XFRM_MSG_BASE;
2525 link = &xfrm_dispatch[type];
2526
2527 /* All operations require privileges, even GET */
2528 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2529 return -EPERM;
2530
2531 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2532 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2533 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2534 if (link->dump == NULL)
2535 return -EINVAL;
2536
2537 {
2538 struct netlink_dump_control c = {
2539 .start = link->start,
2540 .dump = link->dump,
2541 .done = link->done,
2542 };
2543 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2544 }
2545 }
2546
2547 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2548 link->nla_max ? : XFRMA_MAX,
2549 link->nla_pol ? : xfrma_policy, extack);
2550 if (err < 0)
2551 return err;
2552
2553 if (link->doit == NULL)
2554 return -EINVAL;
2555
2556 return link->doit(skb, nlh, attrs);
2557 }
2558
2559 static void xfrm_netlink_rcv(struct sk_buff *skb)
2560 {
2561 struct net *net = sock_net(skb->sk);
2562
2563 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2564 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2565 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2566 }
2567
2568 static inline size_t xfrm_expire_msgsize(void)
2569 {
2570 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2571 + nla_total_size(sizeof(struct xfrm_mark));
2572 }
2573
2574 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2575 {
2576 struct xfrm_user_expire *ue;
2577 struct nlmsghdr *nlh;
2578 int err;
2579
2580 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2581 if (nlh == NULL)
2582 return -EMSGSIZE;
2583
2584 ue = nlmsg_data(nlh);
2585 copy_to_user_state(x, &ue->state);
2586 ue->hard = (c->data.hard != 0) ? 1 : 0;
2587 /* clear the padding bytes */
2588 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2589
2590 err = xfrm_mark_put(skb, &x->mark);
2591 if (err)
2592 return err;
2593
2594 nlmsg_end(skb, nlh);
2595 return 0;
2596 }
2597
2598 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2599 {
2600 struct net *net = xs_net(x);
2601 struct sk_buff *skb;
2602
2603 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2604 if (skb == NULL)
2605 return -ENOMEM;
2606
2607 if (build_expire(skb, x, c) < 0) {
2608 kfree_skb(skb);
2609 return -EMSGSIZE;
2610 }
2611
2612 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2613 }
2614
2615 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2616 {
2617 struct net *net = xs_net(x);
2618 struct sk_buff *skb;
2619
2620 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2621 if (skb == NULL)
2622 return -ENOMEM;
2623
2624 if (build_aevent(skb, x, c) < 0)
2625 BUG();
2626
2627 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2628 }
2629
2630 static int xfrm_notify_sa_flush(const struct km_event *c)
2631 {
2632 struct net *net = c->net;
2633 struct xfrm_usersa_flush *p;
2634 struct nlmsghdr *nlh;
2635 struct sk_buff *skb;
2636 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2637
2638 skb = nlmsg_new(len, GFP_ATOMIC);
2639 if (skb == NULL)
2640 return -ENOMEM;
2641
2642 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2643 if (nlh == NULL) {
2644 kfree_skb(skb);
2645 return -EMSGSIZE;
2646 }
2647
2648 p = nlmsg_data(nlh);
2649 p->proto = c->data.proto;
2650
2651 nlmsg_end(skb, nlh);
2652
2653 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2654 }
2655
2656 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2657 {
2658 size_t l = 0;
2659 if (x->aead)
2660 l += nla_total_size(aead_len(x->aead));
2661 if (x->aalg) {
2662 l += nla_total_size(sizeof(struct xfrm_algo) +
2663 (x->aalg->alg_key_len + 7) / 8);
2664 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2665 }
2666 if (x->ealg)
2667 l += nla_total_size(xfrm_alg_len(x->ealg));
2668 if (x->calg)
2669 l += nla_total_size(sizeof(*x->calg));
2670 if (x->encap)
2671 l += nla_total_size(sizeof(*x->encap));
2672 if (x->tfcpad)
2673 l += nla_total_size(sizeof(x->tfcpad));
2674 if (x->replay_esn)
2675 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2676 else
2677 l += nla_total_size(sizeof(struct xfrm_replay_state));
2678 if (x->security)
2679 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2680 x->security->ctx_len);
2681 if (x->coaddr)
2682 l += nla_total_size(sizeof(*x->coaddr));
2683 if (x->props.extra_flags)
2684 l += nla_total_size(sizeof(x->props.extra_flags));
2685 if (x->xso.dev)
2686 l += nla_total_size(sizeof(x->xso));
2687
2688 /* Must count x->lastused as it may become non-zero behind our back. */
2689 l += nla_total_size_64bit(sizeof(u64));
2690
2691 return l;
2692 }
2693
2694 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2695 {
2696 struct net *net = xs_net(x);
2697 struct xfrm_usersa_info *p;
2698 struct xfrm_usersa_id *id;
2699 struct nlmsghdr *nlh;
2700 struct sk_buff *skb;
2701 int len = xfrm_sa_len(x);
2702 int headlen, err;
2703
2704 headlen = sizeof(*p);
2705 if (c->event == XFRM_MSG_DELSA) {
2706 len += nla_total_size(headlen);
2707 headlen = sizeof(*id);
2708 len += nla_total_size(sizeof(struct xfrm_mark));
2709 }
2710 len += NLMSG_ALIGN(headlen);
2711
2712 skb = nlmsg_new(len, GFP_ATOMIC);
2713 if (skb == NULL)
2714 return -ENOMEM;
2715
2716 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2717 err = -EMSGSIZE;
2718 if (nlh == NULL)
2719 goto out_free_skb;
2720
2721 p = nlmsg_data(nlh);
2722 if (c->event == XFRM_MSG_DELSA) {
2723 struct nlattr *attr;
2724
2725 id = nlmsg_data(nlh);
2726 memset(id, 0, sizeof(*id));
2727 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2728 id->spi = x->id.spi;
2729 id->family = x->props.family;
2730 id->proto = x->id.proto;
2731
2732 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2733 err = -EMSGSIZE;
2734 if (attr == NULL)
2735 goto out_free_skb;
2736
2737 p = nla_data(attr);
2738 }
2739 err = copy_to_user_state_extra(x, p, skb);
2740 if (err)
2741 goto out_free_skb;
2742
2743 nlmsg_end(skb, nlh);
2744
2745 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2746
2747 out_free_skb:
2748 kfree_skb(skb);
2749 return err;
2750 }
2751
2752 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2753 {
2754
2755 switch (c->event) {
2756 case XFRM_MSG_EXPIRE:
2757 return xfrm_exp_state_notify(x, c);
2758 case XFRM_MSG_NEWAE:
2759 return xfrm_aevent_state_notify(x, c);
2760 case XFRM_MSG_DELSA:
2761 case XFRM_MSG_UPDSA:
2762 case XFRM_MSG_NEWSA:
2763 return xfrm_notify_sa(x, c);
2764 case XFRM_MSG_FLUSHSA:
2765 return xfrm_notify_sa_flush(c);
2766 default:
2767 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2768 c->event);
2769 break;
2770 }
2771
2772 return 0;
2773
2774 }
2775
2776 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2777 struct xfrm_policy *xp)
2778 {
2779 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2780 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2781 + nla_total_size(sizeof(struct xfrm_mark))
2782 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2783 + userpolicy_type_attrsize();
2784 }
2785
2786 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2787 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2788 {
2789 __u32 seq = xfrm_get_acqseq();
2790 struct xfrm_user_acquire *ua;
2791 struct nlmsghdr *nlh;
2792 int err;
2793
2794 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2795 if (nlh == NULL)
2796 return -EMSGSIZE;
2797
2798 ua = nlmsg_data(nlh);
2799 memcpy(&ua->id, &x->id, sizeof(ua->id));
2800 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2801 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2802 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2803 ua->aalgos = xt->aalgos;
2804 ua->ealgos = xt->ealgos;
2805 ua->calgos = xt->calgos;
2806 ua->seq = x->km.seq = seq;
2807
2808 err = copy_to_user_tmpl(xp, skb);
2809 if (!err)
2810 err = copy_to_user_state_sec_ctx(x, skb);
2811 if (!err)
2812 err = copy_to_user_policy_type(xp->type, skb);
2813 if (!err)
2814 err = xfrm_mark_put(skb, &xp->mark);
2815 if (err) {
2816 nlmsg_cancel(skb, nlh);
2817 return err;
2818 }
2819
2820 nlmsg_end(skb, nlh);
2821 return 0;
2822 }
2823
2824 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2825 struct xfrm_policy *xp)
2826 {
2827 struct net *net = xs_net(x);
2828 struct sk_buff *skb;
2829
2830 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2831 if (skb == NULL)
2832 return -ENOMEM;
2833
2834 if (build_acquire(skb, x, xt, xp) < 0)
2835 BUG();
2836
2837 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2838 }
2839
2840 /* User gives us xfrm_user_policy_info followed by an array of 0
2841 * or more templates.
2842 */
2843 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2844 u8 *data, int len, int *dir)
2845 {
2846 struct net *net = sock_net(sk);
2847 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2848 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2849 struct xfrm_policy *xp;
2850 int nr;
2851
2852 switch (sk->sk_family) {
2853 case AF_INET:
2854 if (opt != IP_XFRM_POLICY) {
2855 *dir = -EOPNOTSUPP;
2856 return NULL;
2857 }
2858 break;
2859 #if IS_ENABLED(CONFIG_IPV6)
2860 case AF_INET6:
2861 if (opt != IPV6_XFRM_POLICY) {
2862 *dir = -EOPNOTSUPP;
2863 return NULL;
2864 }
2865 break;
2866 #endif
2867 default:
2868 *dir = -EINVAL;
2869 return NULL;
2870 }
2871
2872 *dir = -EINVAL;
2873
2874 if (len < sizeof(*p) ||
2875 verify_newpolicy_info(p))
2876 return NULL;
2877
2878 nr = ((len - sizeof(*p)) / sizeof(*ut));
2879 if (validate_tmpl(nr, ut, p->sel.family))
2880 return NULL;
2881
2882 if (p->dir > XFRM_POLICY_OUT)
2883 return NULL;
2884
2885 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2886 if (xp == NULL) {
2887 *dir = -ENOBUFS;
2888 return NULL;
2889 }
2890
2891 copy_from_user_policy(xp, p);
2892 xp->type = XFRM_POLICY_TYPE_MAIN;
2893 copy_templates(xp, ut, nr);
2894
2895 *dir = p->dir;
2896
2897 return xp;
2898 }
2899
2900 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2901 {
2902 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2903 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2904 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2905 + nla_total_size(sizeof(struct xfrm_mark))
2906 + userpolicy_type_attrsize();
2907 }
2908
2909 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2910 int dir, const struct km_event *c)
2911 {
2912 struct xfrm_user_polexpire *upe;
2913 int hard = c->data.hard;
2914 struct nlmsghdr *nlh;
2915 int err;
2916
2917 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2918 if (nlh == NULL)
2919 return -EMSGSIZE;
2920
2921 upe = nlmsg_data(nlh);
2922 copy_to_user_policy(xp, &upe->pol, dir);
2923 err = copy_to_user_tmpl(xp, skb);
2924 if (!err)
2925 err = copy_to_user_sec_ctx(xp, skb);
2926 if (!err)
2927 err = copy_to_user_policy_type(xp->type, skb);
2928 if (!err)
2929 err = xfrm_mark_put(skb, &xp->mark);
2930 if (err) {
2931 nlmsg_cancel(skb, nlh);
2932 return err;
2933 }
2934 upe->hard = !!hard;
2935
2936 nlmsg_end(skb, nlh);
2937 return 0;
2938 }
2939
2940 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2941 {
2942 struct net *net = xp_net(xp);
2943 struct sk_buff *skb;
2944
2945 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2946 if (skb == NULL)
2947 return -ENOMEM;
2948
2949 if (build_polexpire(skb, xp, dir, c) < 0)
2950 BUG();
2951
2952 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2953 }
2954
2955 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2956 {
2957 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2958 struct net *net = xp_net(xp);
2959 struct xfrm_userpolicy_info *p;
2960 struct xfrm_userpolicy_id *id;
2961 struct nlmsghdr *nlh;
2962 struct sk_buff *skb;
2963 int headlen, err;
2964
2965 headlen = sizeof(*p);
2966 if (c->event == XFRM_MSG_DELPOLICY) {
2967 len += nla_total_size(headlen);
2968 headlen = sizeof(*id);
2969 }
2970 len += userpolicy_type_attrsize();
2971 len += nla_total_size(sizeof(struct xfrm_mark));
2972 len += NLMSG_ALIGN(headlen);
2973
2974 skb = nlmsg_new(len, GFP_ATOMIC);
2975 if (skb == NULL)
2976 return -ENOMEM;
2977
2978 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2979 err = -EMSGSIZE;
2980 if (nlh == NULL)
2981 goto out_free_skb;
2982
2983 p = nlmsg_data(nlh);
2984 if (c->event == XFRM_MSG_DELPOLICY) {
2985 struct nlattr *attr;
2986
2987 id = nlmsg_data(nlh);
2988 memset(id, 0, sizeof(*id));
2989 id->dir = dir;
2990 if (c->data.byid)
2991 id->index = xp->index;
2992 else
2993 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2994
2995 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2996 err = -EMSGSIZE;
2997 if (attr == NULL)
2998 goto out_free_skb;
2999
3000 p = nla_data(attr);
3001 }
3002
3003 copy_to_user_policy(xp, p, dir);
3004 err = copy_to_user_tmpl(xp, skb);
3005 if (!err)
3006 err = copy_to_user_policy_type(xp->type, skb);
3007 if (!err)
3008 err = xfrm_mark_put(skb, &xp->mark);
3009 if (err)
3010 goto out_free_skb;
3011
3012 nlmsg_end(skb, nlh);
3013
3014 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3015
3016 out_free_skb:
3017 kfree_skb(skb);
3018 return err;
3019 }
3020
3021 static int xfrm_notify_policy_flush(const struct km_event *c)
3022 {
3023 struct net *net = c->net;
3024 struct nlmsghdr *nlh;
3025 struct sk_buff *skb;
3026 int err;
3027
3028 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3029 if (skb == NULL)
3030 return -ENOMEM;
3031
3032 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3033 err = -EMSGSIZE;
3034 if (nlh == NULL)
3035 goto out_free_skb;
3036 err = copy_to_user_policy_type(c->data.type, skb);
3037 if (err)
3038 goto out_free_skb;
3039
3040 nlmsg_end(skb, nlh);
3041
3042 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3043
3044 out_free_skb:
3045 kfree_skb(skb);
3046 return err;
3047 }
3048
3049 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3050 {
3051
3052 switch (c->event) {
3053 case XFRM_MSG_NEWPOLICY:
3054 case XFRM_MSG_UPDPOLICY:
3055 case XFRM_MSG_DELPOLICY:
3056 return xfrm_notify_policy(xp, dir, c);
3057 case XFRM_MSG_FLUSHPOLICY:
3058 return xfrm_notify_policy_flush(c);
3059 case XFRM_MSG_POLEXPIRE:
3060 return xfrm_exp_policy_notify(xp, dir, c);
3061 default:
3062 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3063 c->event);
3064 }
3065
3066 return 0;
3067
3068 }
3069
3070 static inline size_t xfrm_report_msgsize(void)
3071 {
3072 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3073 }
3074
3075 static int build_report(struct sk_buff *skb, u8 proto,
3076 struct xfrm_selector *sel, xfrm_address_t *addr)
3077 {
3078 struct xfrm_user_report *ur;
3079 struct nlmsghdr *nlh;
3080
3081 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3082 if (nlh == NULL)
3083 return -EMSGSIZE;
3084
3085 ur = nlmsg_data(nlh);
3086 ur->proto = proto;
3087 memcpy(&ur->sel, sel, sizeof(ur->sel));
3088
3089 if (addr) {
3090 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3091 if (err) {
3092 nlmsg_cancel(skb, nlh);
3093 return err;
3094 }
3095 }
3096 nlmsg_end(skb, nlh);
3097 return 0;
3098 }
3099
3100 static int xfrm_send_report(struct net *net, u8 proto,
3101 struct xfrm_selector *sel, xfrm_address_t *addr)
3102 {
3103 struct sk_buff *skb;
3104
3105 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3106 if (skb == NULL)
3107 return -ENOMEM;
3108
3109 if (build_report(skb, proto, sel, addr) < 0)
3110 BUG();
3111
3112 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3113 }
3114
3115 static inline size_t xfrm_mapping_msgsize(void)
3116 {
3117 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3118 }
3119
3120 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3121 xfrm_address_t *new_saddr, __be16 new_sport)
3122 {
3123 struct xfrm_user_mapping *um;
3124 struct nlmsghdr *nlh;
3125
3126 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3127 if (nlh == NULL)
3128 return -EMSGSIZE;
3129
3130 um = nlmsg_data(nlh);
3131
3132 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3133 um->id.spi = x->id.spi;
3134 um->id.family = x->props.family;
3135 um->id.proto = x->id.proto;
3136 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3137 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3138 um->new_sport = new_sport;
3139 um->old_sport = x->encap->encap_sport;
3140 um->reqid = x->props.reqid;
3141
3142 nlmsg_end(skb, nlh);
3143 return 0;
3144 }
3145
3146 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3147 __be16 sport)
3148 {
3149 struct net *net = xs_net(x);
3150 struct sk_buff *skb;
3151
3152 if (x->id.proto != IPPROTO_ESP)
3153 return -EINVAL;
3154
3155 if (!x->encap)
3156 return -EINVAL;
3157
3158 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3159 if (skb == NULL)
3160 return -ENOMEM;
3161
3162 if (build_mapping(skb, x, ipaddr, sport) < 0)
3163 BUG();
3164
3165 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3166 }
3167
3168 static bool xfrm_is_alive(const struct km_event *c)
3169 {
3170 return (bool)xfrm_acquire_is_on(c->net);
3171 }
3172
3173 static struct xfrm_mgr netlink_mgr = {
3174 .notify = xfrm_send_state_notify,
3175 .acquire = xfrm_send_acquire,
3176 .compile_policy = xfrm_compile_policy,
3177 .notify_policy = xfrm_send_policy_notify,
3178 .report = xfrm_send_report,
3179 .migrate = xfrm_send_migrate,
3180 .new_mapping = xfrm_send_mapping,
3181 .is_alive = xfrm_is_alive,
3182 };
3183
3184 static int __net_init xfrm_user_net_init(struct net *net)
3185 {
3186 struct sock *nlsk;
3187 struct netlink_kernel_cfg cfg = {
3188 .groups = XFRMNLGRP_MAX,
3189 .input = xfrm_netlink_rcv,
3190 };
3191
3192 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3193 if (nlsk == NULL)
3194 return -ENOMEM;
3195 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3196 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3197 return 0;
3198 }
3199
3200 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3201 {
3202 struct net *net;
3203 list_for_each_entry(net, net_exit_list, exit_list)
3204 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3205 synchronize_net();
3206 list_for_each_entry(net, net_exit_list, exit_list)
3207 netlink_kernel_release(net->xfrm.nlsk_stash);
3208 }
3209
3210 static struct pernet_operations xfrm_user_net_ops = {
3211 .init = xfrm_user_net_init,
3212 .exit_batch = xfrm_user_net_exit,
3213 };
3214
3215 static int __init xfrm_user_init(void)
3216 {
3217 int rv;
3218
3219 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3220
3221 rv = register_pernet_subsys(&xfrm_user_net_ops);
3222 if (rv < 0)
3223 return rv;
3224 rv = xfrm_register_km(&netlink_mgr);
3225 if (rv < 0)
3226 unregister_pernet_subsys(&xfrm_user_net_ops);
3227 return rv;
3228 }
3229
3230 static void __exit xfrm_user_exit(void)
3231 {
3232 xfrm_unregister_km(&netlink_mgr);
3233 unregister_pernet_subsys(&xfrm_user_net_ops);
3234 }
3235
3236 module_init(xfrm_user_init);
3237 module_exit(xfrm_user_exit);
3238 MODULE_LICENSE("GPL");
3239 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3240
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