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