xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision e23feb16)
1 /* xfrm_user.c: User interface to configure xfrm engine.
2  *
3  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4  *
5  * Changes:
6  *	Mitsuru KANDA @USAGI
7  * 	Kazunori MIYAZAWA @USAGI
8  * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9  * 		IPv6 support
10  *
11  */
12 
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 
35 static inline int aead_len(struct xfrm_algo_aead *alg)
36 {
37 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39 
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 	struct nlattr *rt = attrs[type];
43 	struct xfrm_algo *algp;
44 
45 	if (!rt)
46 		return 0;
47 
48 	algp = nla_data(rt);
49 	if (nla_len(rt) < xfrm_alg_len(algp))
50 		return -EINVAL;
51 
52 	switch (type) {
53 	case XFRMA_ALG_AUTH:
54 	case XFRMA_ALG_CRYPT:
55 	case XFRMA_ALG_COMP:
56 		break;
57 
58 	default:
59 		return -EINVAL;
60 	}
61 
62 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 	return 0;
64 }
65 
66 static int verify_auth_trunc(struct nlattr **attrs)
67 {
68 	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 	struct xfrm_algo_auth *algp;
70 
71 	if (!rt)
72 		return 0;
73 
74 	algp = nla_data(rt);
75 	if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 		return -EINVAL;
77 
78 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 	return 0;
80 }
81 
82 static int verify_aead(struct nlattr **attrs)
83 {
84 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 	struct xfrm_algo_aead *algp;
86 
87 	if (!rt)
88 		return 0;
89 
90 	algp = nla_data(rt);
91 	if (nla_len(rt) < aead_len(algp))
92 		return -EINVAL;
93 
94 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 	return 0;
96 }
97 
98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 			   xfrm_address_t **addrp)
100 {
101 	struct nlattr *rt = attrs[type];
102 
103 	if (rt && addrp)
104 		*addrp = nla_data(rt);
105 }
106 
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 	struct xfrm_user_sec_ctx *uctx;
111 
112 	if (!rt)
113 		return 0;
114 
115 	uctx = nla_data(rt);
116 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 		return -EINVAL;
118 
119 	return 0;
120 }
121 
122 static inline int verify_replay(struct xfrm_usersa_info *p,
123 				struct nlattr **attrs)
124 {
125 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126 	struct xfrm_replay_state_esn *rs;
127 
128 	if (p->flags & XFRM_STATE_ESN) {
129 		if (!rt)
130 			return -EINVAL;
131 
132 		rs = nla_data(rt);
133 
134 		if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135 			return -EINVAL;
136 
137 		if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138 		    nla_len(rt) != sizeof(*rs))
139 			return -EINVAL;
140 	}
141 
142 	if (!rt)
143 		return 0;
144 
145 	if (p->id.proto != IPPROTO_ESP)
146 		return -EINVAL;
147 
148 	if (p->replay_window != 0)
149 		return -EINVAL;
150 
151 	return 0;
152 }
153 
154 static int verify_newsa_info(struct xfrm_usersa_info *p,
155 			     struct nlattr **attrs)
156 {
157 	int err;
158 
159 	err = -EINVAL;
160 	switch (p->family) {
161 	case AF_INET:
162 		break;
163 
164 	case AF_INET6:
165 #if IS_ENABLED(CONFIG_IPV6)
166 		break;
167 #else
168 		err = -EAFNOSUPPORT;
169 		goto out;
170 #endif
171 
172 	default:
173 		goto out;
174 	}
175 
176 	err = -EINVAL;
177 	switch (p->id.proto) {
178 	case IPPROTO_AH:
179 		if ((!attrs[XFRMA_ALG_AUTH]	&&
180 		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
181 		    attrs[XFRMA_ALG_AEAD]	||
182 		    attrs[XFRMA_ALG_CRYPT]	||
183 		    attrs[XFRMA_ALG_COMP]	||
184 		    attrs[XFRMA_TFCPAD])
185 			goto out;
186 		break;
187 
188 	case IPPROTO_ESP:
189 		if (attrs[XFRMA_ALG_COMP])
190 			goto out;
191 		if (!attrs[XFRMA_ALG_AUTH] &&
192 		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
193 		    !attrs[XFRMA_ALG_CRYPT] &&
194 		    !attrs[XFRMA_ALG_AEAD])
195 			goto out;
196 		if ((attrs[XFRMA_ALG_AUTH] ||
197 		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
198 		     attrs[XFRMA_ALG_CRYPT]) &&
199 		    attrs[XFRMA_ALG_AEAD])
200 			goto out;
201 		if (attrs[XFRMA_TFCPAD] &&
202 		    p->mode != XFRM_MODE_TUNNEL)
203 			goto out;
204 		break;
205 
206 	case IPPROTO_COMP:
207 		if (!attrs[XFRMA_ALG_COMP]	||
208 		    attrs[XFRMA_ALG_AEAD]	||
209 		    attrs[XFRMA_ALG_AUTH]	||
210 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
211 		    attrs[XFRMA_ALG_CRYPT]	||
212 		    attrs[XFRMA_TFCPAD])
213 			goto out;
214 		break;
215 
216 #if IS_ENABLED(CONFIG_IPV6)
217 	case IPPROTO_DSTOPTS:
218 	case IPPROTO_ROUTING:
219 		if (attrs[XFRMA_ALG_COMP]	||
220 		    attrs[XFRMA_ALG_AUTH]	||
221 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
222 		    attrs[XFRMA_ALG_AEAD]	||
223 		    attrs[XFRMA_ALG_CRYPT]	||
224 		    attrs[XFRMA_ENCAP]		||
225 		    attrs[XFRMA_SEC_CTX]	||
226 		    attrs[XFRMA_TFCPAD]		||
227 		    !attrs[XFRMA_COADDR])
228 			goto out;
229 		break;
230 #endif
231 
232 	default:
233 		goto out;
234 	}
235 
236 	if ((err = verify_aead(attrs)))
237 		goto out;
238 	if ((err = verify_auth_trunc(attrs)))
239 		goto out;
240 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
241 		goto out;
242 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
243 		goto out;
244 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
245 		goto out;
246 	if ((err = verify_sec_ctx_len(attrs)))
247 		goto out;
248 	if ((err = verify_replay(p, attrs)))
249 		goto out;
250 
251 	err = -EINVAL;
252 	switch (p->mode) {
253 	case XFRM_MODE_TRANSPORT:
254 	case XFRM_MODE_TUNNEL:
255 	case XFRM_MODE_ROUTEOPTIMIZATION:
256 	case XFRM_MODE_BEET:
257 		break;
258 
259 	default:
260 		goto out;
261 	}
262 
263 	err = 0;
264 
265 out:
266 	return err;
267 }
268 
269 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
270 			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
271 			   struct nlattr *rta)
272 {
273 	struct xfrm_algo *p, *ualg;
274 	struct xfrm_algo_desc *algo;
275 
276 	if (!rta)
277 		return 0;
278 
279 	ualg = nla_data(rta);
280 
281 	algo = get_byname(ualg->alg_name, 1);
282 	if (!algo)
283 		return -ENOSYS;
284 	*props = algo->desc.sadb_alg_id;
285 
286 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
287 	if (!p)
288 		return -ENOMEM;
289 
290 	strcpy(p->alg_name, algo->name);
291 	*algpp = p;
292 	return 0;
293 }
294 
295 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296 		       struct nlattr *rta)
297 {
298 	struct xfrm_algo *ualg;
299 	struct xfrm_algo_auth *p;
300 	struct xfrm_algo_desc *algo;
301 
302 	if (!rta)
303 		return 0;
304 
305 	ualg = nla_data(rta);
306 
307 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308 	if (!algo)
309 		return -ENOSYS;
310 	*props = algo->desc.sadb_alg_id;
311 
312 	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313 	if (!p)
314 		return -ENOMEM;
315 
316 	strcpy(p->alg_name, algo->name);
317 	p->alg_key_len = ualg->alg_key_len;
318 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320 
321 	*algpp = p;
322 	return 0;
323 }
324 
325 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326 			     struct nlattr *rta)
327 {
328 	struct xfrm_algo_auth *p, *ualg;
329 	struct xfrm_algo_desc *algo;
330 
331 	if (!rta)
332 		return 0;
333 
334 	ualg = nla_data(rta);
335 
336 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337 	if (!algo)
338 		return -ENOSYS;
339 	if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340 	    ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
341 		return -EINVAL;
342 	*props = algo->desc.sadb_alg_id;
343 
344 	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345 	if (!p)
346 		return -ENOMEM;
347 
348 	strcpy(p->alg_name, algo->name);
349 	if (!p->alg_trunc_len)
350 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351 
352 	*algpp = p;
353 	return 0;
354 }
355 
356 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357 		       struct nlattr *rta)
358 {
359 	struct xfrm_algo_aead *p, *ualg;
360 	struct xfrm_algo_desc *algo;
361 
362 	if (!rta)
363 		return 0;
364 
365 	ualg = nla_data(rta);
366 
367 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368 	if (!algo)
369 		return -ENOSYS;
370 	*props = algo->desc.sadb_alg_id;
371 
372 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373 	if (!p)
374 		return -ENOMEM;
375 
376 	strcpy(p->alg_name, algo->name);
377 	*algpp = p;
378 	return 0;
379 }
380 
381 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382 					 struct nlattr *rp)
383 {
384 	struct xfrm_replay_state_esn *up;
385 	int ulen;
386 
387 	if (!replay_esn || !rp)
388 		return 0;
389 
390 	up = nla_data(rp);
391 	ulen = xfrm_replay_state_esn_len(up);
392 
393 	if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
394 		return -EINVAL;
395 
396 	return 0;
397 }
398 
399 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400 				       struct xfrm_replay_state_esn **preplay_esn,
401 				       struct nlattr *rta)
402 {
403 	struct xfrm_replay_state_esn *p, *pp, *up;
404 	int klen, ulen;
405 
406 	if (!rta)
407 		return 0;
408 
409 	up = nla_data(rta);
410 	klen = xfrm_replay_state_esn_len(up);
411 	ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
412 
413 	p = kzalloc(klen, GFP_KERNEL);
414 	if (!p)
415 		return -ENOMEM;
416 
417 	pp = kzalloc(klen, GFP_KERNEL);
418 	if (!pp) {
419 		kfree(p);
420 		return -ENOMEM;
421 	}
422 
423 	memcpy(p, up, ulen);
424 	memcpy(pp, up, ulen);
425 
426 	*replay_esn = p;
427 	*preplay_esn = pp;
428 
429 	return 0;
430 }
431 
432 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
433 {
434 	int len = 0;
435 
436 	if (xfrm_ctx) {
437 		len += sizeof(struct xfrm_user_sec_ctx);
438 		len += xfrm_ctx->ctx_len;
439 	}
440 	return len;
441 }
442 
443 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444 {
445 	memcpy(&x->id, &p->id, sizeof(x->id));
446 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
447 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
448 	x->props.mode = p->mode;
449 	x->props.replay_window = p->replay_window;
450 	x->props.reqid = p->reqid;
451 	x->props.family = p->family;
452 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
453 	x->props.flags = p->flags;
454 
455 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
456 		x->sel.family = p->family;
457 }
458 
459 /*
460  * someday when pfkey also has support, we could have the code
461  * somehow made shareable and move it to xfrm_state.c - JHS
462  *
463 */
464 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
465 				  int update_esn)
466 {
467 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
468 	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
469 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
470 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
471 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
472 
473 	if (re) {
474 		struct xfrm_replay_state_esn *replay_esn;
475 		replay_esn = nla_data(re);
476 		memcpy(x->replay_esn, replay_esn,
477 		       xfrm_replay_state_esn_len(replay_esn));
478 		memcpy(x->preplay_esn, replay_esn,
479 		       xfrm_replay_state_esn_len(replay_esn));
480 	}
481 
482 	if (rp) {
483 		struct xfrm_replay_state *replay;
484 		replay = nla_data(rp);
485 		memcpy(&x->replay, replay, sizeof(*replay));
486 		memcpy(&x->preplay, replay, sizeof(*replay));
487 	}
488 
489 	if (lt) {
490 		struct xfrm_lifetime_cur *ltime;
491 		ltime = nla_data(lt);
492 		x->curlft.bytes = ltime->bytes;
493 		x->curlft.packets = ltime->packets;
494 		x->curlft.add_time = ltime->add_time;
495 		x->curlft.use_time = ltime->use_time;
496 	}
497 
498 	if (et)
499 		x->replay_maxage = nla_get_u32(et);
500 
501 	if (rt)
502 		x->replay_maxdiff = nla_get_u32(rt);
503 }
504 
505 static struct xfrm_state *xfrm_state_construct(struct net *net,
506 					       struct xfrm_usersa_info *p,
507 					       struct nlattr **attrs,
508 					       int *errp)
509 {
510 	struct xfrm_state *x = xfrm_state_alloc(net);
511 	int err = -ENOMEM;
512 
513 	if (!x)
514 		goto error_no_put;
515 
516 	copy_from_user_state(x, p);
517 
518 	if (attrs[XFRMA_SA_EXTRA_FLAGS])
519 		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
520 
521 	if ((err = attach_aead(&x->aead, &x->props.ealgo,
522 			       attrs[XFRMA_ALG_AEAD])))
523 		goto error;
524 	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
525 				     attrs[XFRMA_ALG_AUTH_TRUNC])))
526 		goto error;
527 	if (!x->props.aalgo) {
528 		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
529 				       attrs[XFRMA_ALG_AUTH])))
530 			goto error;
531 	}
532 	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
533 				   xfrm_ealg_get_byname,
534 				   attrs[XFRMA_ALG_CRYPT])))
535 		goto error;
536 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
537 				   xfrm_calg_get_byname,
538 				   attrs[XFRMA_ALG_COMP])))
539 		goto error;
540 
541 	if (attrs[XFRMA_ENCAP]) {
542 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
543 				   sizeof(*x->encap), GFP_KERNEL);
544 		if (x->encap == NULL)
545 			goto error;
546 	}
547 
548 	if (attrs[XFRMA_TFCPAD])
549 		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
550 
551 	if (attrs[XFRMA_COADDR]) {
552 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
553 				    sizeof(*x->coaddr), GFP_KERNEL);
554 		if (x->coaddr == NULL)
555 			goto error;
556 	}
557 
558 	xfrm_mark_get(attrs, &x->mark);
559 
560 	err = __xfrm_init_state(x, false);
561 	if (err)
562 		goto error;
563 
564 	if (attrs[XFRMA_SEC_CTX] &&
565 	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
566 		goto error;
567 
568 	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
569 					       attrs[XFRMA_REPLAY_ESN_VAL])))
570 		goto error;
571 
572 	x->km.seq = p->seq;
573 	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
574 	/* sysctl_xfrm_aevent_etime is in 100ms units */
575 	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
576 
577 	if ((err = xfrm_init_replay(x)))
578 		goto error;
579 
580 	/* override default values from above */
581 	xfrm_update_ae_params(x, attrs, 0);
582 
583 	return x;
584 
585 error:
586 	x->km.state = XFRM_STATE_DEAD;
587 	xfrm_state_put(x);
588 error_no_put:
589 	*errp = err;
590 	return NULL;
591 }
592 
593 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
594 		struct nlattr **attrs)
595 {
596 	struct net *net = sock_net(skb->sk);
597 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
598 	struct xfrm_state *x;
599 	int err;
600 	struct km_event c;
601 	kuid_t loginuid = audit_get_loginuid(current);
602 	u32 sessionid = audit_get_sessionid(current);
603 	u32 sid;
604 
605 	err = verify_newsa_info(p, attrs);
606 	if (err)
607 		return err;
608 
609 	x = xfrm_state_construct(net, p, attrs, &err);
610 	if (!x)
611 		return err;
612 
613 	xfrm_state_hold(x);
614 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
615 		err = xfrm_state_add(x);
616 	else
617 		err = xfrm_state_update(x);
618 
619 	security_task_getsecid(current, &sid);
620 	xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
621 
622 	if (err < 0) {
623 		x->km.state = XFRM_STATE_DEAD;
624 		__xfrm_state_put(x);
625 		goto out;
626 	}
627 
628 	c.seq = nlh->nlmsg_seq;
629 	c.portid = nlh->nlmsg_pid;
630 	c.event = nlh->nlmsg_type;
631 
632 	km_state_notify(x, &c);
633 out:
634 	xfrm_state_put(x);
635 	return err;
636 }
637 
638 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
639 						 struct xfrm_usersa_id *p,
640 						 struct nlattr **attrs,
641 						 int *errp)
642 {
643 	struct xfrm_state *x = NULL;
644 	struct xfrm_mark m;
645 	int err;
646 	u32 mark = xfrm_mark_get(attrs, &m);
647 
648 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
649 		err = -ESRCH;
650 		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
651 	} else {
652 		xfrm_address_t *saddr = NULL;
653 
654 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
655 		if (!saddr) {
656 			err = -EINVAL;
657 			goto out;
658 		}
659 
660 		err = -ESRCH;
661 		x = xfrm_state_lookup_byaddr(net, mark,
662 					     &p->daddr, saddr,
663 					     p->proto, p->family);
664 	}
665 
666  out:
667 	if (!x && errp)
668 		*errp = err;
669 	return x;
670 }
671 
672 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
673 		struct nlattr **attrs)
674 {
675 	struct net *net = sock_net(skb->sk);
676 	struct xfrm_state *x;
677 	int err = -ESRCH;
678 	struct km_event c;
679 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
680 	kuid_t loginuid = audit_get_loginuid(current);
681 	u32 sessionid = audit_get_sessionid(current);
682 	u32 sid;
683 
684 	x = xfrm_user_state_lookup(net, p, attrs, &err);
685 	if (x == NULL)
686 		return err;
687 
688 	if ((err = security_xfrm_state_delete(x)) != 0)
689 		goto out;
690 
691 	if (xfrm_state_kern(x)) {
692 		err = -EPERM;
693 		goto out;
694 	}
695 
696 	err = xfrm_state_delete(x);
697 
698 	if (err < 0)
699 		goto out;
700 
701 	c.seq = nlh->nlmsg_seq;
702 	c.portid = nlh->nlmsg_pid;
703 	c.event = nlh->nlmsg_type;
704 	km_state_notify(x, &c);
705 
706 out:
707 	security_task_getsecid(current, &sid);
708 	xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
709 	xfrm_state_put(x);
710 	return err;
711 }
712 
713 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
714 {
715 	memset(p, 0, sizeof(*p));
716 	memcpy(&p->id, &x->id, sizeof(p->id));
717 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
718 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
719 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
720 	memcpy(&p->stats, &x->stats, sizeof(p->stats));
721 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
722 	p->mode = x->props.mode;
723 	p->replay_window = x->props.replay_window;
724 	p->reqid = x->props.reqid;
725 	p->family = x->props.family;
726 	p->flags = x->props.flags;
727 	p->seq = x->km.seq;
728 }
729 
730 struct xfrm_dump_info {
731 	struct sk_buff *in_skb;
732 	struct sk_buff *out_skb;
733 	u32 nlmsg_seq;
734 	u16 nlmsg_flags;
735 };
736 
737 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
738 {
739 	struct xfrm_user_sec_ctx *uctx;
740 	struct nlattr *attr;
741 	int ctx_size = sizeof(*uctx) + s->ctx_len;
742 
743 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
744 	if (attr == NULL)
745 		return -EMSGSIZE;
746 
747 	uctx = nla_data(attr);
748 	uctx->exttype = XFRMA_SEC_CTX;
749 	uctx->len = ctx_size;
750 	uctx->ctx_doi = s->ctx_doi;
751 	uctx->ctx_alg = s->ctx_alg;
752 	uctx->ctx_len = s->ctx_len;
753 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
754 
755 	return 0;
756 }
757 
758 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
759 {
760 	struct xfrm_algo *algo;
761 	struct nlattr *nla;
762 
763 	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
764 			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
765 	if (!nla)
766 		return -EMSGSIZE;
767 
768 	algo = nla_data(nla);
769 	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
770 	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
771 	algo->alg_key_len = auth->alg_key_len;
772 
773 	return 0;
774 }
775 
776 /* Don't change this without updating xfrm_sa_len! */
777 static int copy_to_user_state_extra(struct xfrm_state *x,
778 				    struct xfrm_usersa_info *p,
779 				    struct sk_buff *skb)
780 {
781 	int ret = 0;
782 
783 	copy_to_user_state(x, p);
784 
785 	if (x->props.extra_flags) {
786 		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
787 				  x->props.extra_flags);
788 		if (ret)
789 			goto out;
790 	}
791 
792 	if (x->coaddr) {
793 		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
794 		if (ret)
795 			goto out;
796 	}
797 	if (x->lastused) {
798 		ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
799 		if (ret)
800 			goto out;
801 	}
802 	if (x->aead) {
803 		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
804 		if (ret)
805 			goto out;
806 	}
807 	if (x->aalg) {
808 		ret = copy_to_user_auth(x->aalg, skb);
809 		if (!ret)
810 			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
811 				      xfrm_alg_auth_len(x->aalg), x->aalg);
812 		if (ret)
813 			goto out;
814 	}
815 	if (x->ealg) {
816 		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
817 		if (ret)
818 			goto out;
819 	}
820 	if (x->calg) {
821 		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
822 		if (ret)
823 			goto out;
824 	}
825 	if (x->encap) {
826 		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
827 		if (ret)
828 			goto out;
829 	}
830 	if (x->tfcpad) {
831 		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
832 		if (ret)
833 			goto out;
834 	}
835 	ret = xfrm_mark_put(skb, &x->mark);
836 	if (ret)
837 		goto out;
838 	if (x->replay_esn) {
839 		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
840 			      xfrm_replay_state_esn_len(x->replay_esn),
841 			      x->replay_esn);
842 		if (ret)
843 			goto out;
844 	}
845 	if (x->security)
846 		ret = copy_sec_ctx(x->security, skb);
847 out:
848 	return ret;
849 }
850 
851 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
852 {
853 	struct xfrm_dump_info *sp = ptr;
854 	struct sk_buff *in_skb = sp->in_skb;
855 	struct sk_buff *skb = sp->out_skb;
856 	struct xfrm_usersa_info *p;
857 	struct nlmsghdr *nlh;
858 	int err;
859 
860 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
861 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
862 	if (nlh == NULL)
863 		return -EMSGSIZE;
864 
865 	p = nlmsg_data(nlh);
866 
867 	err = copy_to_user_state_extra(x, p, skb);
868 	if (err) {
869 		nlmsg_cancel(skb, nlh);
870 		return err;
871 	}
872 	nlmsg_end(skb, nlh);
873 	return 0;
874 }
875 
876 static int xfrm_dump_sa_done(struct netlink_callback *cb)
877 {
878 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
879 	xfrm_state_walk_done(walk);
880 	return 0;
881 }
882 
883 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
884 {
885 	struct net *net = sock_net(skb->sk);
886 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
887 	struct xfrm_dump_info info;
888 
889 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
890 		     sizeof(cb->args) - sizeof(cb->args[0]));
891 
892 	info.in_skb = cb->skb;
893 	info.out_skb = skb;
894 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
895 	info.nlmsg_flags = NLM_F_MULTI;
896 
897 	if (!cb->args[0]) {
898 		cb->args[0] = 1;
899 		xfrm_state_walk_init(walk, 0);
900 	}
901 
902 	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
903 
904 	return skb->len;
905 }
906 
907 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
908 					  struct xfrm_state *x, u32 seq)
909 {
910 	struct xfrm_dump_info info;
911 	struct sk_buff *skb;
912 	int err;
913 
914 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
915 	if (!skb)
916 		return ERR_PTR(-ENOMEM);
917 
918 	info.in_skb = in_skb;
919 	info.out_skb = skb;
920 	info.nlmsg_seq = seq;
921 	info.nlmsg_flags = 0;
922 
923 	err = dump_one_state(x, 0, &info);
924 	if (err) {
925 		kfree_skb(skb);
926 		return ERR_PTR(err);
927 	}
928 
929 	return skb;
930 }
931 
932 static inline size_t xfrm_spdinfo_msgsize(void)
933 {
934 	return NLMSG_ALIGN(4)
935 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
936 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo));
937 }
938 
939 static int build_spdinfo(struct sk_buff *skb, struct net *net,
940 			 u32 portid, u32 seq, u32 flags)
941 {
942 	struct xfrmk_spdinfo si;
943 	struct xfrmu_spdinfo spc;
944 	struct xfrmu_spdhinfo sph;
945 	struct nlmsghdr *nlh;
946 	int err;
947 	u32 *f;
948 
949 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
950 	if (nlh == NULL) /* shouldn't really happen ... */
951 		return -EMSGSIZE;
952 
953 	f = nlmsg_data(nlh);
954 	*f = flags;
955 	xfrm_spd_getinfo(net, &si);
956 	spc.incnt = si.incnt;
957 	spc.outcnt = si.outcnt;
958 	spc.fwdcnt = si.fwdcnt;
959 	spc.inscnt = si.inscnt;
960 	spc.outscnt = si.outscnt;
961 	spc.fwdscnt = si.fwdscnt;
962 	sph.spdhcnt = si.spdhcnt;
963 	sph.spdhmcnt = si.spdhmcnt;
964 
965 	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
966 	if (!err)
967 		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
968 	if (err) {
969 		nlmsg_cancel(skb, nlh);
970 		return err;
971 	}
972 
973 	return nlmsg_end(skb, nlh);
974 }
975 
976 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
977 		struct nlattr **attrs)
978 {
979 	struct net *net = sock_net(skb->sk);
980 	struct sk_buff *r_skb;
981 	u32 *flags = nlmsg_data(nlh);
982 	u32 sportid = NETLINK_CB(skb).portid;
983 	u32 seq = nlh->nlmsg_seq;
984 
985 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
986 	if (r_skb == NULL)
987 		return -ENOMEM;
988 
989 	if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
990 		BUG();
991 
992 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
993 }
994 
995 static inline size_t xfrm_sadinfo_msgsize(void)
996 {
997 	return NLMSG_ALIGN(4)
998 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
999 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1000 }
1001 
1002 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1003 			 u32 portid, u32 seq, u32 flags)
1004 {
1005 	struct xfrmk_sadinfo si;
1006 	struct xfrmu_sadhinfo sh;
1007 	struct nlmsghdr *nlh;
1008 	int err;
1009 	u32 *f;
1010 
1011 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1012 	if (nlh == NULL) /* shouldn't really happen ... */
1013 		return -EMSGSIZE;
1014 
1015 	f = nlmsg_data(nlh);
1016 	*f = flags;
1017 	xfrm_sad_getinfo(net, &si);
1018 
1019 	sh.sadhmcnt = si.sadhmcnt;
1020 	sh.sadhcnt = si.sadhcnt;
1021 
1022 	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1023 	if (!err)
1024 		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1025 	if (err) {
1026 		nlmsg_cancel(skb, nlh);
1027 		return err;
1028 	}
1029 
1030 	return nlmsg_end(skb, nlh);
1031 }
1032 
1033 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1034 		struct nlattr **attrs)
1035 {
1036 	struct net *net = sock_net(skb->sk);
1037 	struct sk_buff *r_skb;
1038 	u32 *flags = nlmsg_data(nlh);
1039 	u32 sportid = NETLINK_CB(skb).portid;
1040 	u32 seq = nlh->nlmsg_seq;
1041 
1042 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1043 	if (r_skb == NULL)
1044 		return -ENOMEM;
1045 
1046 	if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1047 		BUG();
1048 
1049 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1050 }
1051 
1052 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1053 		struct nlattr **attrs)
1054 {
1055 	struct net *net = sock_net(skb->sk);
1056 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1057 	struct xfrm_state *x;
1058 	struct sk_buff *resp_skb;
1059 	int err = -ESRCH;
1060 
1061 	x = xfrm_user_state_lookup(net, p, attrs, &err);
1062 	if (x == NULL)
1063 		goto out_noput;
1064 
1065 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1066 	if (IS_ERR(resp_skb)) {
1067 		err = PTR_ERR(resp_skb);
1068 	} else {
1069 		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1070 	}
1071 	xfrm_state_put(x);
1072 out_noput:
1073 	return err;
1074 }
1075 
1076 static int verify_userspi_info(struct xfrm_userspi_info *p)
1077 {
1078 	switch (p->info.id.proto) {
1079 	case IPPROTO_AH:
1080 	case IPPROTO_ESP:
1081 		break;
1082 
1083 	case IPPROTO_COMP:
1084 		/* IPCOMP spi is 16-bits. */
1085 		if (p->max >= 0x10000)
1086 			return -EINVAL;
1087 		break;
1088 
1089 	default:
1090 		return -EINVAL;
1091 	}
1092 
1093 	if (p->min > p->max)
1094 		return -EINVAL;
1095 
1096 	return 0;
1097 }
1098 
1099 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1100 		struct nlattr **attrs)
1101 {
1102 	struct net *net = sock_net(skb->sk);
1103 	struct xfrm_state *x;
1104 	struct xfrm_userspi_info *p;
1105 	struct sk_buff *resp_skb;
1106 	xfrm_address_t *daddr;
1107 	int family;
1108 	int err;
1109 	u32 mark;
1110 	struct xfrm_mark m;
1111 
1112 	p = nlmsg_data(nlh);
1113 	err = verify_userspi_info(p);
1114 	if (err)
1115 		goto out_noput;
1116 
1117 	family = p->info.family;
1118 	daddr = &p->info.id.daddr;
1119 
1120 	x = NULL;
1121 
1122 	mark = xfrm_mark_get(attrs, &m);
1123 	if (p->info.seq) {
1124 		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1125 		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1126 			xfrm_state_put(x);
1127 			x = NULL;
1128 		}
1129 	}
1130 
1131 	if (!x)
1132 		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1133 				  p->info.id.proto, daddr,
1134 				  &p->info.saddr, 1,
1135 				  family);
1136 	err = -ENOENT;
1137 	if (x == NULL)
1138 		goto out_noput;
1139 
1140 	err = xfrm_alloc_spi(x, p->min, p->max);
1141 	if (err)
1142 		goto out;
1143 
1144 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1145 	if (IS_ERR(resp_skb)) {
1146 		err = PTR_ERR(resp_skb);
1147 		goto out;
1148 	}
1149 
1150 	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1151 
1152 out:
1153 	xfrm_state_put(x);
1154 out_noput:
1155 	return err;
1156 }
1157 
1158 static int verify_policy_dir(u8 dir)
1159 {
1160 	switch (dir) {
1161 	case XFRM_POLICY_IN:
1162 	case XFRM_POLICY_OUT:
1163 	case XFRM_POLICY_FWD:
1164 		break;
1165 
1166 	default:
1167 		return -EINVAL;
1168 	}
1169 
1170 	return 0;
1171 }
1172 
1173 static int verify_policy_type(u8 type)
1174 {
1175 	switch (type) {
1176 	case XFRM_POLICY_TYPE_MAIN:
1177 #ifdef CONFIG_XFRM_SUB_POLICY
1178 	case XFRM_POLICY_TYPE_SUB:
1179 #endif
1180 		break;
1181 
1182 	default:
1183 		return -EINVAL;
1184 	}
1185 
1186 	return 0;
1187 }
1188 
1189 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1190 {
1191 	switch (p->share) {
1192 	case XFRM_SHARE_ANY:
1193 	case XFRM_SHARE_SESSION:
1194 	case XFRM_SHARE_USER:
1195 	case XFRM_SHARE_UNIQUE:
1196 		break;
1197 
1198 	default:
1199 		return -EINVAL;
1200 	}
1201 
1202 	switch (p->action) {
1203 	case XFRM_POLICY_ALLOW:
1204 	case XFRM_POLICY_BLOCK:
1205 		break;
1206 
1207 	default:
1208 		return -EINVAL;
1209 	}
1210 
1211 	switch (p->sel.family) {
1212 	case AF_INET:
1213 		break;
1214 
1215 	case AF_INET6:
1216 #if IS_ENABLED(CONFIG_IPV6)
1217 		break;
1218 #else
1219 		return  -EAFNOSUPPORT;
1220 #endif
1221 
1222 	default:
1223 		return -EINVAL;
1224 	}
1225 
1226 	return verify_policy_dir(p->dir);
1227 }
1228 
1229 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1230 {
1231 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1232 	struct xfrm_user_sec_ctx *uctx;
1233 
1234 	if (!rt)
1235 		return 0;
1236 
1237 	uctx = nla_data(rt);
1238 	return security_xfrm_policy_alloc(&pol->security, uctx);
1239 }
1240 
1241 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1242 			   int nr)
1243 {
1244 	int i;
1245 
1246 	xp->xfrm_nr = nr;
1247 	for (i = 0; i < nr; i++, ut++) {
1248 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1249 
1250 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1251 		memcpy(&t->saddr, &ut->saddr,
1252 		       sizeof(xfrm_address_t));
1253 		t->reqid = ut->reqid;
1254 		t->mode = ut->mode;
1255 		t->share = ut->share;
1256 		t->optional = ut->optional;
1257 		t->aalgos = ut->aalgos;
1258 		t->ealgos = ut->ealgos;
1259 		t->calgos = ut->calgos;
1260 		/* If all masks are ~0, then we allow all algorithms. */
1261 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1262 		t->encap_family = ut->family;
1263 	}
1264 }
1265 
1266 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1267 {
1268 	int i;
1269 
1270 	if (nr > XFRM_MAX_DEPTH)
1271 		return -EINVAL;
1272 
1273 	for (i = 0; i < nr; i++) {
1274 		/* We never validated the ut->family value, so many
1275 		 * applications simply leave it at zero.  The check was
1276 		 * never made and ut->family was ignored because all
1277 		 * templates could be assumed to have the same family as
1278 		 * the policy itself.  Now that we will have ipv4-in-ipv6
1279 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1280 		 */
1281 		if (!ut[i].family)
1282 			ut[i].family = family;
1283 
1284 		switch (ut[i].family) {
1285 		case AF_INET:
1286 			break;
1287 #if IS_ENABLED(CONFIG_IPV6)
1288 		case AF_INET6:
1289 			break;
1290 #endif
1291 		default:
1292 			return -EINVAL;
1293 		}
1294 	}
1295 
1296 	return 0;
1297 }
1298 
1299 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1300 {
1301 	struct nlattr *rt = attrs[XFRMA_TMPL];
1302 
1303 	if (!rt) {
1304 		pol->xfrm_nr = 0;
1305 	} else {
1306 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1307 		int nr = nla_len(rt) / sizeof(*utmpl);
1308 		int err;
1309 
1310 		err = validate_tmpl(nr, utmpl, pol->family);
1311 		if (err)
1312 			return err;
1313 
1314 		copy_templates(pol, utmpl, nr);
1315 	}
1316 	return 0;
1317 }
1318 
1319 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1320 {
1321 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1322 	struct xfrm_userpolicy_type *upt;
1323 	u8 type = XFRM_POLICY_TYPE_MAIN;
1324 	int err;
1325 
1326 	if (rt) {
1327 		upt = nla_data(rt);
1328 		type = upt->type;
1329 	}
1330 
1331 	err = verify_policy_type(type);
1332 	if (err)
1333 		return err;
1334 
1335 	*tp = type;
1336 	return 0;
1337 }
1338 
1339 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1340 {
1341 	xp->priority = p->priority;
1342 	xp->index = p->index;
1343 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1344 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1345 	xp->action = p->action;
1346 	xp->flags = p->flags;
1347 	xp->family = p->sel.family;
1348 	/* XXX xp->share = p->share; */
1349 }
1350 
1351 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1352 {
1353 	memset(p, 0, sizeof(*p));
1354 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1355 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1356 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1357 	p->priority = xp->priority;
1358 	p->index = xp->index;
1359 	p->sel.family = xp->family;
1360 	p->dir = dir;
1361 	p->action = xp->action;
1362 	p->flags = xp->flags;
1363 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1364 }
1365 
1366 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1367 {
1368 	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1369 	int err;
1370 
1371 	if (!xp) {
1372 		*errp = -ENOMEM;
1373 		return NULL;
1374 	}
1375 
1376 	copy_from_user_policy(xp, p);
1377 
1378 	err = copy_from_user_policy_type(&xp->type, attrs);
1379 	if (err)
1380 		goto error;
1381 
1382 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1383 		err = copy_from_user_sec_ctx(xp, attrs);
1384 	if (err)
1385 		goto error;
1386 
1387 	xfrm_mark_get(attrs, &xp->mark);
1388 
1389 	return xp;
1390  error:
1391 	*errp = err;
1392 	xp->walk.dead = 1;
1393 	xfrm_policy_destroy(xp);
1394 	return NULL;
1395 }
1396 
1397 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1398 		struct nlattr **attrs)
1399 {
1400 	struct net *net = sock_net(skb->sk);
1401 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1402 	struct xfrm_policy *xp;
1403 	struct km_event c;
1404 	int err;
1405 	int excl;
1406 	kuid_t loginuid = audit_get_loginuid(current);
1407 	u32 sessionid = audit_get_sessionid(current);
1408 	u32 sid;
1409 
1410 	err = verify_newpolicy_info(p);
1411 	if (err)
1412 		return err;
1413 	err = verify_sec_ctx_len(attrs);
1414 	if (err)
1415 		return err;
1416 
1417 	xp = xfrm_policy_construct(net, p, attrs, &err);
1418 	if (!xp)
1419 		return err;
1420 
1421 	/* shouldn't excl be based on nlh flags??
1422 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1423 	 * in netlink excl is a flag and you wouldnt need
1424 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1425 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1426 	err = xfrm_policy_insert(p->dir, xp, excl);
1427 	security_task_getsecid(current, &sid);
1428 	xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1429 
1430 	if (err) {
1431 		security_xfrm_policy_free(xp->security);
1432 		kfree(xp);
1433 		return err;
1434 	}
1435 
1436 	c.event = nlh->nlmsg_type;
1437 	c.seq = nlh->nlmsg_seq;
1438 	c.portid = nlh->nlmsg_pid;
1439 	km_policy_notify(xp, p->dir, &c);
1440 
1441 	xfrm_pol_put(xp);
1442 
1443 	return 0;
1444 }
1445 
1446 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1447 {
1448 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1449 	int i;
1450 
1451 	if (xp->xfrm_nr == 0)
1452 		return 0;
1453 
1454 	for (i = 0; i < xp->xfrm_nr; i++) {
1455 		struct xfrm_user_tmpl *up = &vec[i];
1456 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1457 
1458 		memset(up, 0, sizeof(*up));
1459 		memcpy(&up->id, &kp->id, sizeof(up->id));
1460 		up->family = kp->encap_family;
1461 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1462 		up->reqid = kp->reqid;
1463 		up->mode = kp->mode;
1464 		up->share = kp->share;
1465 		up->optional = kp->optional;
1466 		up->aalgos = kp->aalgos;
1467 		up->ealgos = kp->ealgos;
1468 		up->calgos = kp->calgos;
1469 	}
1470 
1471 	return nla_put(skb, XFRMA_TMPL,
1472 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1473 }
1474 
1475 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1476 {
1477 	if (x->security) {
1478 		return copy_sec_ctx(x->security, skb);
1479 	}
1480 	return 0;
1481 }
1482 
1483 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1484 {
1485 	if (xp->security)
1486 		return copy_sec_ctx(xp->security, skb);
1487 	return 0;
1488 }
1489 static inline size_t userpolicy_type_attrsize(void)
1490 {
1491 #ifdef CONFIG_XFRM_SUB_POLICY
1492 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1493 #else
1494 	return 0;
1495 #endif
1496 }
1497 
1498 #ifdef CONFIG_XFRM_SUB_POLICY
1499 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1500 {
1501 	struct xfrm_userpolicy_type upt = {
1502 		.type = type,
1503 	};
1504 
1505 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1506 }
1507 
1508 #else
1509 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1510 {
1511 	return 0;
1512 }
1513 #endif
1514 
1515 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1516 {
1517 	struct xfrm_dump_info *sp = ptr;
1518 	struct xfrm_userpolicy_info *p;
1519 	struct sk_buff *in_skb = sp->in_skb;
1520 	struct sk_buff *skb = sp->out_skb;
1521 	struct nlmsghdr *nlh;
1522 	int err;
1523 
1524 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1525 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1526 	if (nlh == NULL)
1527 		return -EMSGSIZE;
1528 
1529 	p = nlmsg_data(nlh);
1530 	copy_to_user_policy(xp, p, dir);
1531 	err = copy_to_user_tmpl(xp, skb);
1532 	if (!err)
1533 		err = copy_to_user_sec_ctx(xp, skb);
1534 	if (!err)
1535 		err = copy_to_user_policy_type(xp->type, skb);
1536 	if (!err)
1537 		err = xfrm_mark_put(skb, &xp->mark);
1538 	if (err) {
1539 		nlmsg_cancel(skb, nlh);
1540 		return err;
1541 	}
1542 	nlmsg_end(skb, nlh);
1543 	return 0;
1544 }
1545 
1546 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1547 {
1548 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1549 
1550 	xfrm_policy_walk_done(walk);
1551 	return 0;
1552 }
1553 
1554 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1555 {
1556 	struct net *net = sock_net(skb->sk);
1557 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1558 	struct xfrm_dump_info info;
1559 
1560 	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1561 		     sizeof(cb->args) - sizeof(cb->args[0]));
1562 
1563 	info.in_skb = cb->skb;
1564 	info.out_skb = skb;
1565 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1566 	info.nlmsg_flags = NLM_F_MULTI;
1567 
1568 	if (!cb->args[0]) {
1569 		cb->args[0] = 1;
1570 		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1571 	}
1572 
1573 	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1574 
1575 	return skb->len;
1576 }
1577 
1578 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1579 					  struct xfrm_policy *xp,
1580 					  int dir, u32 seq)
1581 {
1582 	struct xfrm_dump_info info;
1583 	struct sk_buff *skb;
1584 	int err;
1585 
1586 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1587 	if (!skb)
1588 		return ERR_PTR(-ENOMEM);
1589 
1590 	info.in_skb = in_skb;
1591 	info.out_skb = skb;
1592 	info.nlmsg_seq = seq;
1593 	info.nlmsg_flags = 0;
1594 
1595 	err = dump_one_policy(xp, dir, 0, &info);
1596 	if (err) {
1597 		kfree_skb(skb);
1598 		return ERR_PTR(err);
1599 	}
1600 
1601 	return skb;
1602 }
1603 
1604 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1605 		struct nlattr **attrs)
1606 {
1607 	struct net *net = sock_net(skb->sk);
1608 	struct xfrm_policy *xp;
1609 	struct xfrm_userpolicy_id *p;
1610 	u8 type = XFRM_POLICY_TYPE_MAIN;
1611 	int err;
1612 	struct km_event c;
1613 	int delete;
1614 	struct xfrm_mark m;
1615 	u32 mark = xfrm_mark_get(attrs, &m);
1616 
1617 	p = nlmsg_data(nlh);
1618 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1619 
1620 	err = copy_from_user_policy_type(&type, attrs);
1621 	if (err)
1622 		return err;
1623 
1624 	err = verify_policy_dir(p->dir);
1625 	if (err)
1626 		return err;
1627 
1628 	if (p->index)
1629 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1630 	else {
1631 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1632 		struct xfrm_sec_ctx *ctx;
1633 
1634 		err = verify_sec_ctx_len(attrs);
1635 		if (err)
1636 			return err;
1637 
1638 		ctx = NULL;
1639 		if (rt) {
1640 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1641 
1642 			err = security_xfrm_policy_alloc(&ctx, uctx);
1643 			if (err)
1644 				return err;
1645 		}
1646 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1647 					   ctx, delete, &err);
1648 		security_xfrm_policy_free(ctx);
1649 	}
1650 	if (xp == NULL)
1651 		return -ENOENT;
1652 
1653 	if (!delete) {
1654 		struct sk_buff *resp_skb;
1655 
1656 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1657 		if (IS_ERR(resp_skb)) {
1658 			err = PTR_ERR(resp_skb);
1659 		} else {
1660 			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1661 					    NETLINK_CB(skb).portid);
1662 		}
1663 	} else {
1664 		kuid_t loginuid = audit_get_loginuid(current);
1665 		u32 sessionid = audit_get_sessionid(current);
1666 		u32 sid;
1667 
1668 		security_task_getsecid(current, &sid);
1669 		xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1670 					 sid);
1671 
1672 		if (err != 0)
1673 			goto out;
1674 
1675 		c.data.byid = p->index;
1676 		c.event = nlh->nlmsg_type;
1677 		c.seq = nlh->nlmsg_seq;
1678 		c.portid = nlh->nlmsg_pid;
1679 		km_policy_notify(xp, p->dir, &c);
1680 	}
1681 
1682 out:
1683 	xfrm_pol_put(xp);
1684 	if (delete && err == 0)
1685 		xfrm_garbage_collect(net);
1686 	return err;
1687 }
1688 
1689 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1690 		struct nlattr **attrs)
1691 {
1692 	struct net *net = sock_net(skb->sk);
1693 	struct km_event c;
1694 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1695 	struct xfrm_audit audit_info;
1696 	int err;
1697 
1698 	audit_info.loginuid = audit_get_loginuid(current);
1699 	audit_info.sessionid = audit_get_sessionid(current);
1700 	security_task_getsecid(current, &audit_info.secid);
1701 	err = xfrm_state_flush(net, p->proto, &audit_info);
1702 	if (err) {
1703 		if (err == -ESRCH) /* empty table */
1704 			return 0;
1705 		return err;
1706 	}
1707 	c.data.proto = p->proto;
1708 	c.event = nlh->nlmsg_type;
1709 	c.seq = nlh->nlmsg_seq;
1710 	c.portid = nlh->nlmsg_pid;
1711 	c.net = net;
1712 	km_state_notify(NULL, &c);
1713 
1714 	return 0;
1715 }
1716 
1717 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1718 {
1719 	size_t replay_size = x->replay_esn ?
1720 			      xfrm_replay_state_esn_len(x->replay_esn) :
1721 			      sizeof(struct xfrm_replay_state);
1722 
1723 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1724 	       + nla_total_size(replay_size)
1725 	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1726 	       + nla_total_size(sizeof(struct xfrm_mark))
1727 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1728 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1729 }
1730 
1731 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1732 {
1733 	struct xfrm_aevent_id *id;
1734 	struct nlmsghdr *nlh;
1735 	int err;
1736 
1737 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1738 	if (nlh == NULL)
1739 		return -EMSGSIZE;
1740 
1741 	id = nlmsg_data(nlh);
1742 	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1743 	id->sa_id.spi = x->id.spi;
1744 	id->sa_id.family = x->props.family;
1745 	id->sa_id.proto = x->id.proto;
1746 	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1747 	id->reqid = x->props.reqid;
1748 	id->flags = c->data.aevent;
1749 
1750 	if (x->replay_esn) {
1751 		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1752 			      xfrm_replay_state_esn_len(x->replay_esn),
1753 			      x->replay_esn);
1754 	} else {
1755 		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1756 			      &x->replay);
1757 	}
1758 	if (err)
1759 		goto out_cancel;
1760 	err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1761 	if (err)
1762 		goto out_cancel;
1763 
1764 	if (id->flags & XFRM_AE_RTHR) {
1765 		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1766 		if (err)
1767 			goto out_cancel;
1768 	}
1769 	if (id->flags & XFRM_AE_ETHR) {
1770 		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1771 				  x->replay_maxage * 10 / HZ);
1772 		if (err)
1773 			goto out_cancel;
1774 	}
1775 	err = xfrm_mark_put(skb, &x->mark);
1776 	if (err)
1777 		goto out_cancel;
1778 
1779 	return nlmsg_end(skb, nlh);
1780 
1781 out_cancel:
1782 	nlmsg_cancel(skb, nlh);
1783 	return err;
1784 }
1785 
1786 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1787 		struct nlattr **attrs)
1788 {
1789 	struct net *net = sock_net(skb->sk);
1790 	struct xfrm_state *x;
1791 	struct sk_buff *r_skb;
1792 	int err;
1793 	struct km_event c;
1794 	u32 mark;
1795 	struct xfrm_mark m;
1796 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1797 	struct xfrm_usersa_id *id = &p->sa_id;
1798 
1799 	mark = xfrm_mark_get(attrs, &m);
1800 
1801 	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1802 	if (x == NULL)
1803 		return -ESRCH;
1804 
1805 	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1806 	if (r_skb == NULL) {
1807 		xfrm_state_put(x);
1808 		return -ENOMEM;
1809 	}
1810 
1811 	/*
1812 	 * XXX: is this lock really needed - none of the other
1813 	 * gets lock (the concern is things getting updated
1814 	 * while we are still reading) - jhs
1815 	*/
1816 	spin_lock_bh(&x->lock);
1817 	c.data.aevent = p->flags;
1818 	c.seq = nlh->nlmsg_seq;
1819 	c.portid = nlh->nlmsg_pid;
1820 
1821 	if (build_aevent(r_skb, x, &c) < 0)
1822 		BUG();
1823 	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1824 	spin_unlock_bh(&x->lock);
1825 	xfrm_state_put(x);
1826 	return err;
1827 }
1828 
1829 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 		struct nlattr **attrs)
1831 {
1832 	struct net *net = sock_net(skb->sk);
1833 	struct xfrm_state *x;
1834 	struct km_event c;
1835 	int err = - EINVAL;
1836 	u32 mark = 0;
1837 	struct xfrm_mark m;
1838 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1839 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1840 	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1841 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1842 
1843 	if (!lt && !rp && !re)
1844 		return err;
1845 
1846 	/* pedantic mode - thou shalt sayeth replaceth */
1847 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1848 		return err;
1849 
1850 	mark = xfrm_mark_get(attrs, &m);
1851 
1852 	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1853 	if (x == NULL)
1854 		return -ESRCH;
1855 
1856 	if (x->km.state != XFRM_STATE_VALID)
1857 		goto out;
1858 
1859 	err = xfrm_replay_verify_len(x->replay_esn, rp);
1860 	if (err)
1861 		goto out;
1862 
1863 	spin_lock_bh(&x->lock);
1864 	xfrm_update_ae_params(x, attrs, 1);
1865 	spin_unlock_bh(&x->lock);
1866 
1867 	c.event = nlh->nlmsg_type;
1868 	c.seq = nlh->nlmsg_seq;
1869 	c.portid = nlh->nlmsg_pid;
1870 	c.data.aevent = XFRM_AE_CU;
1871 	km_state_notify(x, &c);
1872 	err = 0;
1873 out:
1874 	xfrm_state_put(x);
1875 	return err;
1876 }
1877 
1878 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1879 		struct nlattr **attrs)
1880 {
1881 	struct net *net = sock_net(skb->sk);
1882 	struct km_event c;
1883 	u8 type = XFRM_POLICY_TYPE_MAIN;
1884 	int err;
1885 	struct xfrm_audit audit_info;
1886 
1887 	err = copy_from_user_policy_type(&type, attrs);
1888 	if (err)
1889 		return err;
1890 
1891 	audit_info.loginuid = audit_get_loginuid(current);
1892 	audit_info.sessionid = audit_get_sessionid(current);
1893 	security_task_getsecid(current, &audit_info.secid);
1894 	err = xfrm_policy_flush(net, type, &audit_info);
1895 	if (err) {
1896 		if (err == -ESRCH) /* empty table */
1897 			return 0;
1898 		return err;
1899 	}
1900 
1901 	c.data.type = type;
1902 	c.event = nlh->nlmsg_type;
1903 	c.seq = nlh->nlmsg_seq;
1904 	c.portid = nlh->nlmsg_pid;
1905 	c.net = net;
1906 	km_policy_notify(NULL, 0, &c);
1907 	return 0;
1908 }
1909 
1910 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1911 		struct nlattr **attrs)
1912 {
1913 	struct net *net = sock_net(skb->sk);
1914 	struct xfrm_policy *xp;
1915 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1916 	struct xfrm_userpolicy_info *p = &up->pol;
1917 	u8 type = XFRM_POLICY_TYPE_MAIN;
1918 	int err = -ENOENT;
1919 	struct xfrm_mark m;
1920 	u32 mark = xfrm_mark_get(attrs, &m);
1921 
1922 	err = copy_from_user_policy_type(&type, attrs);
1923 	if (err)
1924 		return err;
1925 
1926 	err = verify_policy_dir(p->dir);
1927 	if (err)
1928 		return err;
1929 
1930 	if (p->index)
1931 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1932 	else {
1933 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1934 		struct xfrm_sec_ctx *ctx;
1935 
1936 		err = verify_sec_ctx_len(attrs);
1937 		if (err)
1938 			return err;
1939 
1940 		ctx = NULL;
1941 		if (rt) {
1942 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1943 
1944 			err = security_xfrm_policy_alloc(&ctx, uctx);
1945 			if (err)
1946 				return err;
1947 		}
1948 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1949 					   &p->sel, ctx, 0, &err);
1950 		security_xfrm_policy_free(ctx);
1951 	}
1952 	if (xp == NULL)
1953 		return -ENOENT;
1954 
1955 	if (unlikely(xp->walk.dead))
1956 		goto out;
1957 
1958 	err = 0;
1959 	if (up->hard) {
1960 		kuid_t loginuid = audit_get_loginuid(current);
1961 		u32 sessionid = audit_get_sessionid(current);
1962 		u32 sid;
1963 
1964 		security_task_getsecid(current, &sid);
1965 		xfrm_policy_delete(xp, p->dir);
1966 		xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1967 
1968 	} else {
1969 		// reset the timers here?
1970 		WARN(1, "Dont know what to do with soft policy expire\n");
1971 	}
1972 	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1973 
1974 out:
1975 	xfrm_pol_put(xp);
1976 	return err;
1977 }
1978 
1979 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1980 		struct nlattr **attrs)
1981 {
1982 	struct net *net = sock_net(skb->sk);
1983 	struct xfrm_state *x;
1984 	int err;
1985 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
1986 	struct xfrm_usersa_info *p = &ue->state;
1987 	struct xfrm_mark m;
1988 	u32 mark = xfrm_mark_get(attrs, &m);
1989 
1990 	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1991 
1992 	err = -ENOENT;
1993 	if (x == NULL)
1994 		return err;
1995 
1996 	spin_lock_bh(&x->lock);
1997 	err = -EINVAL;
1998 	if (x->km.state != XFRM_STATE_VALID)
1999 		goto out;
2000 	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2001 
2002 	if (ue->hard) {
2003 		kuid_t loginuid = audit_get_loginuid(current);
2004 		u32 sessionid = audit_get_sessionid(current);
2005 		u32 sid;
2006 
2007 		security_task_getsecid(current, &sid);
2008 		__xfrm_state_delete(x);
2009 		xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
2010 	}
2011 	err = 0;
2012 out:
2013 	spin_unlock_bh(&x->lock);
2014 	xfrm_state_put(x);
2015 	return err;
2016 }
2017 
2018 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2019 		struct nlattr **attrs)
2020 {
2021 	struct net *net = sock_net(skb->sk);
2022 	struct xfrm_policy *xp;
2023 	struct xfrm_user_tmpl *ut;
2024 	int i;
2025 	struct nlattr *rt = attrs[XFRMA_TMPL];
2026 	struct xfrm_mark mark;
2027 
2028 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2029 	struct xfrm_state *x = xfrm_state_alloc(net);
2030 	int err = -ENOMEM;
2031 
2032 	if (!x)
2033 		goto nomem;
2034 
2035 	xfrm_mark_get(attrs, &mark);
2036 
2037 	err = verify_newpolicy_info(&ua->policy);
2038 	if (err)
2039 		goto bad_policy;
2040 
2041 	/*   build an XP */
2042 	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2043 	if (!xp)
2044 		goto free_state;
2045 
2046 	memcpy(&x->id, &ua->id, sizeof(ua->id));
2047 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2048 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2049 	xp->mark.m = x->mark.m = mark.m;
2050 	xp->mark.v = x->mark.v = mark.v;
2051 	ut = nla_data(rt);
2052 	/* extract the templates and for each call km_key */
2053 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2054 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2055 		memcpy(&x->id, &t->id, sizeof(x->id));
2056 		x->props.mode = t->mode;
2057 		x->props.reqid = t->reqid;
2058 		x->props.family = ut->family;
2059 		t->aalgos = ua->aalgos;
2060 		t->ealgos = ua->ealgos;
2061 		t->calgos = ua->calgos;
2062 		err = km_query(x, t, xp);
2063 
2064 	}
2065 
2066 	kfree(x);
2067 	kfree(xp);
2068 
2069 	return 0;
2070 
2071 bad_policy:
2072 	WARN(1, "BAD policy passed\n");
2073 free_state:
2074 	kfree(x);
2075 nomem:
2076 	return err;
2077 }
2078 
2079 #ifdef CONFIG_XFRM_MIGRATE
2080 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2081 				  struct xfrm_kmaddress *k,
2082 				  struct nlattr **attrs, int *num)
2083 {
2084 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2085 	struct xfrm_user_migrate *um;
2086 	int i, num_migrate;
2087 
2088 	if (k != NULL) {
2089 		struct xfrm_user_kmaddress *uk;
2090 
2091 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2092 		memcpy(&k->local, &uk->local, sizeof(k->local));
2093 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2094 		k->family = uk->family;
2095 		k->reserved = uk->reserved;
2096 	}
2097 
2098 	um = nla_data(rt);
2099 	num_migrate = nla_len(rt) / sizeof(*um);
2100 
2101 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2102 		return -EINVAL;
2103 
2104 	for (i = 0; i < num_migrate; i++, um++, ma++) {
2105 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2106 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2107 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2108 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2109 
2110 		ma->proto = um->proto;
2111 		ma->mode = um->mode;
2112 		ma->reqid = um->reqid;
2113 
2114 		ma->old_family = um->old_family;
2115 		ma->new_family = um->new_family;
2116 	}
2117 
2118 	*num = i;
2119 	return 0;
2120 }
2121 
2122 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2123 			   struct nlattr **attrs)
2124 {
2125 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2126 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2127 	struct xfrm_kmaddress km, *kmp;
2128 	u8 type;
2129 	int err;
2130 	int n = 0;
2131 
2132 	if (attrs[XFRMA_MIGRATE] == NULL)
2133 		return -EINVAL;
2134 
2135 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2136 
2137 	err = copy_from_user_policy_type(&type, attrs);
2138 	if (err)
2139 		return err;
2140 
2141 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2142 	if (err)
2143 		return err;
2144 
2145 	if (!n)
2146 		return 0;
2147 
2148 	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2149 
2150 	return 0;
2151 }
2152 #else
2153 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2154 			   struct nlattr **attrs)
2155 {
2156 	return -ENOPROTOOPT;
2157 }
2158 #endif
2159 
2160 #ifdef CONFIG_XFRM_MIGRATE
2161 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2162 {
2163 	struct xfrm_user_migrate um;
2164 
2165 	memset(&um, 0, sizeof(um));
2166 	um.proto = m->proto;
2167 	um.mode = m->mode;
2168 	um.reqid = m->reqid;
2169 	um.old_family = m->old_family;
2170 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2171 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2172 	um.new_family = m->new_family;
2173 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2174 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2175 
2176 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2177 }
2178 
2179 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2180 {
2181 	struct xfrm_user_kmaddress uk;
2182 
2183 	memset(&uk, 0, sizeof(uk));
2184 	uk.family = k->family;
2185 	uk.reserved = k->reserved;
2186 	memcpy(&uk.local, &k->local, sizeof(uk.local));
2187 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2188 
2189 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2190 }
2191 
2192 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2193 {
2194 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2195 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2196 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2197 	      + userpolicy_type_attrsize();
2198 }
2199 
2200 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2201 			 int num_migrate, const struct xfrm_kmaddress *k,
2202 			 const struct xfrm_selector *sel, u8 dir, u8 type)
2203 {
2204 	const struct xfrm_migrate *mp;
2205 	struct xfrm_userpolicy_id *pol_id;
2206 	struct nlmsghdr *nlh;
2207 	int i, err;
2208 
2209 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2210 	if (nlh == NULL)
2211 		return -EMSGSIZE;
2212 
2213 	pol_id = nlmsg_data(nlh);
2214 	/* copy data from selector, dir, and type to the pol_id */
2215 	memset(pol_id, 0, sizeof(*pol_id));
2216 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2217 	pol_id->dir = dir;
2218 
2219 	if (k != NULL) {
2220 		err = copy_to_user_kmaddress(k, skb);
2221 		if (err)
2222 			goto out_cancel;
2223 	}
2224 	err = copy_to_user_policy_type(type, skb);
2225 	if (err)
2226 		goto out_cancel;
2227 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2228 		err = copy_to_user_migrate(mp, skb);
2229 		if (err)
2230 			goto out_cancel;
2231 	}
2232 
2233 	return nlmsg_end(skb, nlh);
2234 
2235 out_cancel:
2236 	nlmsg_cancel(skb, nlh);
2237 	return err;
2238 }
2239 
2240 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2241 			     const struct xfrm_migrate *m, int num_migrate,
2242 			     const struct xfrm_kmaddress *k)
2243 {
2244 	struct net *net = &init_net;
2245 	struct sk_buff *skb;
2246 
2247 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2248 	if (skb == NULL)
2249 		return -ENOMEM;
2250 
2251 	/* build migrate */
2252 	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2253 		BUG();
2254 
2255 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2256 }
2257 #else
2258 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2259 			     const struct xfrm_migrate *m, int num_migrate,
2260 			     const struct xfrm_kmaddress *k)
2261 {
2262 	return -ENOPROTOOPT;
2263 }
2264 #endif
2265 
2266 #define XMSGSIZE(type) sizeof(struct type)
2267 
2268 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2269 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2270 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2271 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2272 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2273 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2274 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2275 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2276 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2277 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2278 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2279 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2280 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2281 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2282 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2283 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2284 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2285 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2286 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2287 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2288 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2289 };
2290 
2291 #undef XMSGSIZE
2292 
2293 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2294 	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2295 	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2296 	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2297 	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2298 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2299 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2300 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2301 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2302 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2303 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2304 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2305 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2306 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2307 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2308 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2309 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2310 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2311 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2312 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2313 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2314 	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2315 	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2316 	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2317 	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2318 };
2319 
2320 static const struct xfrm_link {
2321 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2322 	int (*dump)(struct sk_buff *, struct netlink_callback *);
2323 	int (*done)(struct netlink_callback *);
2324 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2325 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2326 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2327 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2328 						   .dump = xfrm_dump_sa,
2329 						   .done = xfrm_dump_sa_done  },
2330 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2331 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2332 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2333 						   .dump = xfrm_dump_policy,
2334 						   .done = xfrm_dump_policy_done },
2335 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2336 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2337 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2338 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2339 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2340 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2341 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2342 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2343 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2344 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2345 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2346 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2347 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2348 };
2349 
2350 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2351 {
2352 	struct net *net = sock_net(skb->sk);
2353 	struct nlattr *attrs[XFRMA_MAX+1];
2354 	const struct xfrm_link *link;
2355 	int type, err;
2356 
2357 	type = nlh->nlmsg_type;
2358 	if (type > XFRM_MSG_MAX)
2359 		return -EINVAL;
2360 
2361 	type -= XFRM_MSG_BASE;
2362 	link = &xfrm_dispatch[type];
2363 
2364 	/* All operations require privileges, even GET */
2365 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2366 		return -EPERM;
2367 
2368 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2369 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2370 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2371 		if (link->dump == NULL)
2372 			return -EINVAL;
2373 
2374 		{
2375 			struct netlink_dump_control c = {
2376 				.dump = link->dump,
2377 				.done = link->done,
2378 			};
2379 			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2380 		}
2381 	}
2382 
2383 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2384 			  xfrma_policy);
2385 	if (err < 0)
2386 		return err;
2387 
2388 	if (link->doit == NULL)
2389 		return -EINVAL;
2390 
2391 	return link->doit(skb, nlh, attrs);
2392 }
2393 
2394 static void xfrm_netlink_rcv(struct sk_buff *skb)
2395 {
2396 	mutex_lock(&xfrm_cfg_mutex);
2397 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2398 	mutex_unlock(&xfrm_cfg_mutex);
2399 }
2400 
2401 static inline size_t xfrm_expire_msgsize(void)
2402 {
2403 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2404 	       + nla_total_size(sizeof(struct xfrm_mark));
2405 }
2406 
2407 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2408 {
2409 	struct xfrm_user_expire *ue;
2410 	struct nlmsghdr *nlh;
2411 	int err;
2412 
2413 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2414 	if (nlh == NULL)
2415 		return -EMSGSIZE;
2416 
2417 	ue = nlmsg_data(nlh);
2418 	copy_to_user_state(x, &ue->state);
2419 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2420 
2421 	err = xfrm_mark_put(skb, &x->mark);
2422 	if (err)
2423 		return err;
2424 
2425 	return nlmsg_end(skb, nlh);
2426 }
2427 
2428 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2429 {
2430 	struct net *net = xs_net(x);
2431 	struct sk_buff *skb;
2432 
2433 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2434 	if (skb == NULL)
2435 		return -ENOMEM;
2436 
2437 	if (build_expire(skb, x, c) < 0) {
2438 		kfree_skb(skb);
2439 		return -EMSGSIZE;
2440 	}
2441 
2442 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2443 }
2444 
2445 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2446 {
2447 	struct net *net = xs_net(x);
2448 	struct sk_buff *skb;
2449 
2450 	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2451 	if (skb == NULL)
2452 		return -ENOMEM;
2453 
2454 	if (build_aevent(skb, x, c) < 0)
2455 		BUG();
2456 
2457 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2458 }
2459 
2460 static int xfrm_notify_sa_flush(const struct km_event *c)
2461 {
2462 	struct net *net = c->net;
2463 	struct xfrm_usersa_flush *p;
2464 	struct nlmsghdr *nlh;
2465 	struct sk_buff *skb;
2466 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2467 
2468 	skb = nlmsg_new(len, GFP_ATOMIC);
2469 	if (skb == NULL)
2470 		return -ENOMEM;
2471 
2472 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2473 	if (nlh == NULL) {
2474 		kfree_skb(skb);
2475 		return -EMSGSIZE;
2476 	}
2477 
2478 	p = nlmsg_data(nlh);
2479 	p->proto = c->data.proto;
2480 
2481 	nlmsg_end(skb, nlh);
2482 
2483 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2484 }
2485 
2486 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2487 {
2488 	size_t l = 0;
2489 	if (x->aead)
2490 		l += nla_total_size(aead_len(x->aead));
2491 	if (x->aalg) {
2492 		l += nla_total_size(sizeof(struct xfrm_algo) +
2493 				    (x->aalg->alg_key_len + 7) / 8);
2494 		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2495 	}
2496 	if (x->ealg)
2497 		l += nla_total_size(xfrm_alg_len(x->ealg));
2498 	if (x->calg)
2499 		l += nla_total_size(sizeof(*x->calg));
2500 	if (x->encap)
2501 		l += nla_total_size(sizeof(*x->encap));
2502 	if (x->tfcpad)
2503 		l += nla_total_size(sizeof(x->tfcpad));
2504 	if (x->replay_esn)
2505 		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2506 	if (x->security)
2507 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2508 				    x->security->ctx_len);
2509 	if (x->coaddr)
2510 		l += nla_total_size(sizeof(*x->coaddr));
2511 	if (x->props.extra_flags)
2512 		l += nla_total_size(sizeof(x->props.extra_flags));
2513 
2514 	/* Must count x->lastused as it may become non-zero behind our back. */
2515 	l += nla_total_size(sizeof(u64));
2516 
2517 	return l;
2518 }
2519 
2520 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2521 {
2522 	struct net *net = xs_net(x);
2523 	struct xfrm_usersa_info *p;
2524 	struct xfrm_usersa_id *id;
2525 	struct nlmsghdr *nlh;
2526 	struct sk_buff *skb;
2527 	int len = xfrm_sa_len(x);
2528 	int headlen, err;
2529 
2530 	headlen = sizeof(*p);
2531 	if (c->event == XFRM_MSG_DELSA) {
2532 		len += nla_total_size(headlen);
2533 		headlen = sizeof(*id);
2534 		len += nla_total_size(sizeof(struct xfrm_mark));
2535 	}
2536 	len += NLMSG_ALIGN(headlen);
2537 
2538 	skb = nlmsg_new(len, GFP_ATOMIC);
2539 	if (skb == NULL)
2540 		return -ENOMEM;
2541 
2542 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2543 	err = -EMSGSIZE;
2544 	if (nlh == NULL)
2545 		goto out_free_skb;
2546 
2547 	p = nlmsg_data(nlh);
2548 	if (c->event == XFRM_MSG_DELSA) {
2549 		struct nlattr *attr;
2550 
2551 		id = nlmsg_data(nlh);
2552 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2553 		id->spi = x->id.spi;
2554 		id->family = x->props.family;
2555 		id->proto = x->id.proto;
2556 
2557 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2558 		err = -EMSGSIZE;
2559 		if (attr == NULL)
2560 			goto out_free_skb;
2561 
2562 		p = nla_data(attr);
2563 	}
2564 	err = copy_to_user_state_extra(x, p, skb);
2565 	if (err)
2566 		goto out_free_skb;
2567 
2568 	nlmsg_end(skb, nlh);
2569 
2570 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2571 
2572 out_free_skb:
2573 	kfree_skb(skb);
2574 	return err;
2575 }
2576 
2577 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2578 {
2579 
2580 	switch (c->event) {
2581 	case XFRM_MSG_EXPIRE:
2582 		return xfrm_exp_state_notify(x, c);
2583 	case XFRM_MSG_NEWAE:
2584 		return xfrm_aevent_state_notify(x, c);
2585 	case XFRM_MSG_DELSA:
2586 	case XFRM_MSG_UPDSA:
2587 	case XFRM_MSG_NEWSA:
2588 		return xfrm_notify_sa(x, c);
2589 	case XFRM_MSG_FLUSHSA:
2590 		return xfrm_notify_sa_flush(c);
2591 	default:
2592 		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2593 		       c->event);
2594 		break;
2595 	}
2596 
2597 	return 0;
2598 
2599 }
2600 
2601 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2602 					  struct xfrm_policy *xp)
2603 {
2604 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2605 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2606 	       + nla_total_size(sizeof(struct xfrm_mark))
2607 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2608 	       + userpolicy_type_attrsize();
2609 }
2610 
2611 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2612 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2613 {
2614 	__u32 seq = xfrm_get_acqseq();
2615 	struct xfrm_user_acquire *ua;
2616 	struct nlmsghdr *nlh;
2617 	int err;
2618 
2619 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2620 	if (nlh == NULL)
2621 		return -EMSGSIZE;
2622 
2623 	ua = nlmsg_data(nlh);
2624 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2625 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2626 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2627 	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2628 	ua->aalgos = xt->aalgos;
2629 	ua->ealgos = xt->ealgos;
2630 	ua->calgos = xt->calgos;
2631 	ua->seq = x->km.seq = seq;
2632 
2633 	err = copy_to_user_tmpl(xp, skb);
2634 	if (!err)
2635 		err = copy_to_user_state_sec_ctx(x, skb);
2636 	if (!err)
2637 		err = copy_to_user_policy_type(xp->type, skb);
2638 	if (!err)
2639 		err = xfrm_mark_put(skb, &xp->mark);
2640 	if (err) {
2641 		nlmsg_cancel(skb, nlh);
2642 		return err;
2643 	}
2644 
2645 	return nlmsg_end(skb, nlh);
2646 }
2647 
2648 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2649 			     struct xfrm_policy *xp)
2650 {
2651 	struct net *net = xs_net(x);
2652 	struct sk_buff *skb;
2653 
2654 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2655 	if (skb == NULL)
2656 		return -ENOMEM;
2657 
2658 	if (build_acquire(skb, x, xt, xp) < 0)
2659 		BUG();
2660 
2661 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2662 }
2663 
2664 /* User gives us xfrm_user_policy_info followed by an array of 0
2665  * or more templates.
2666  */
2667 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2668 					       u8 *data, int len, int *dir)
2669 {
2670 	struct net *net = sock_net(sk);
2671 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2672 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2673 	struct xfrm_policy *xp;
2674 	int nr;
2675 
2676 	switch (sk->sk_family) {
2677 	case AF_INET:
2678 		if (opt != IP_XFRM_POLICY) {
2679 			*dir = -EOPNOTSUPP;
2680 			return NULL;
2681 		}
2682 		break;
2683 #if IS_ENABLED(CONFIG_IPV6)
2684 	case AF_INET6:
2685 		if (opt != IPV6_XFRM_POLICY) {
2686 			*dir = -EOPNOTSUPP;
2687 			return NULL;
2688 		}
2689 		break;
2690 #endif
2691 	default:
2692 		*dir = -EINVAL;
2693 		return NULL;
2694 	}
2695 
2696 	*dir = -EINVAL;
2697 
2698 	if (len < sizeof(*p) ||
2699 	    verify_newpolicy_info(p))
2700 		return NULL;
2701 
2702 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2703 	if (validate_tmpl(nr, ut, p->sel.family))
2704 		return NULL;
2705 
2706 	if (p->dir > XFRM_POLICY_OUT)
2707 		return NULL;
2708 
2709 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2710 	if (xp == NULL) {
2711 		*dir = -ENOBUFS;
2712 		return NULL;
2713 	}
2714 
2715 	copy_from_user_policy(xp, p);
2716 	xp->type = XFRM_POLICY_TYPE_MAIN;
2717 	copy_templates(xp, ut, nr);
2718 
2719 	*dir = p->dir;
2720 
2721 	return xp;
2722 }
2723 
2724 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2725 {
2726 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2727 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2728 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2729 	       + nla_total_size(sizeof(struct xfrm_mark))
2730 	       + userpolicy_type_attrsize();
2731 }
2732 
2733 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2734 			   int dir, const struct km_event *c)
2735 {
2736 	struct xfrm_user_polexpire *upe;
2737 	int hard = c->data.hard;
2738 	struct nlmsghdr *nlh;
2739 	int err;
2740 
2741 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2742 	if (nlh == NULL)
2743 		return -EMSGSIZE;
2744 
2745 	upe = nlmsg_data(nlh);
2746 	copy_to_user_policy(xp, &upe->pol, dir);
2747 	err = copy_to_user_tmpl(xp, skb);
2748 	if (!err)
2749 		err = copy_to_user_sec_ctx(xp, skb);
2750 	if (!err)
2751 		err = copy_to_user_policy_type(xp->type, skb);
2752 	if (!err)
2753 		err = xfrm_mark_put(skb, &xp->mark);
2754 	if (err) {
2755 		nlmsg_cancel(skb, nlh);
2756 		return err;
2757 	}
2758 	upe->hard = !!hard;
2759 
2760 	return nlmsg_end(skb, nlh);
2761 }
2762 
2763 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2764 {
2765 	struct net *net = xp_net(xp);
2766 	struct sk_buff *skb;
2767 
2768 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2769 	if (skb == NULL)
2770 		return -ENOMEM;
2771 
2772 	if (build_polexpire(skb, xp, dir, c) < 0)
2773 		BUG();
2774 
2775 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2776 }
2777 
2778 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2779 {
2780 	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2781 	struct net *net = xp_net(xp);
2782 	struct xfrm_userpolicy_info *p;
2783 	struct xfrm_userpolicy_id *id;
2784 	struct nlmsghdr *nlh;
2785 	struct sk_buff *skb;
2786 	int headlen, err;
2787 
2788 	headlen = sizeof(*p);
2789 	if (c->event == XFRM_MSG_DELPOLICY) {
2790 		len += nla_total_size(headlen);
2791 		headlen = sizeof(*id);
2792 	}
2793 	len += userpolicy_type_attrsize();
2794 	len += nla_total_size(sizeof(struct xfrm_mark));
2795 	len += NLMSG_ALIGN(headlen);
2796 
2797 	skb = nlmsg_new(len, GFP_ATOMIC);
2798 	if (skb == NULL)
2799 		return -ENOMEM;
2800 
2801 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2802 	err = -EMSGSIZE;
2803 	if (nlh == NULL)
2804 		goto out_free_skb;
2805 
2806 	p = nlmsg_data(nlh);
2807 	if (c->event == XFRM_MSG_DELPOLICY) {
2808 		struct nlattr *attr;
2809 
2810 		id = nlmsg_data(nlh);
2811 		memset(id, 0, sizeof(*id));
2812 		id->dir = dir;
2813 		if (c->data.byid)
2814 			id->index = xp->index;
2815 		else
2816 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2817 
2818 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2819 		err = -EMSGSIZE;
2820 		if (attr == NULL)
2821 			goto out_free_skb;
2822 
2823 		p = nla_data(attr);
2824 	}
2825 
2826 	copy_to_user_policy(xp, p, dir);
2827 	err = copy_to_user_tmpl(xp, skb);
2828 	if (!err)
2829 		err = copy_to_user_policy_type(xp->type, skb);
2830 	if (!err)
2831 		err = xfrm_mark_put(skb, &xp->mark);
2832 	if (err)
2833 		goto out_free_skb;
2834 
2835 	nlmsg_end(skb, nlh);
2836 
2837 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2838 
2839 out_free_skb:
2840 	kfree_skb(skb);
2841 	return err;
2842 }
2843 
2844 static int xfrm_notify_policy_flush(const struct km_event *c)
2845 {
2846 	struct net *net = c->net;
2847 	struct nlmsghdr *nlh;
2848 	struct sk_buff *skb;
2849 	int err;
2850 
2851 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2852 	if (skb == NULL)
2853 		return -ENOMEM;
2854 
2855 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2856 	err = -EMSGSIZE;
2857 	if (nlh == NULL)
2858 		goto out_free_skb;
2859 	err = copy_to_user_policy_type(c->data.type, skb);
2860 	if (err)
2861 		goto out_free_skb;
2862 
2863 	nlmsg_end(skb, nlh);
2864 
2865 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2866 
2867 out_free_skb:
2868 	kfree_skb(skb);
2869 	return err;
2870 }
2871 
2872 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2873 {
2874 
2875 	switch (c->event) {
2876 	case XFRM_MSG_NEWPOLICY:
2877 	case XFRM_MSG_UPDPOLICY:
2878 	case XFRM_MSG_DELPOLICY:
2879 		return xfrm_notify_policy(xp, dir, c);
2880 	case XFRM_MSG_FLUSHPOLICY:
2881 		return xfrm_notify_policy_flush(c);
2882 	case XFRM_MSG_POLEXPIRE:
2883 		return xfrm_exp_policy_notify(xp, dir, c);
2884 	default:
2885 		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2886 		       c->event);
2887 	}
2888 
2889 	return 0;
2890 
2891 }
2892 
2893 static inline size_t xfrm_report_msgsize(void)
2894 {
2895 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2896 }
2897 
2898 static int build_report(struct sk_buff *skb, u8 proto,
2899 			struct xfrm_selector *sel, xfrm_address_t *addr)
2900 {
2901 	struct xfrm_user_report *ur;
2902 	struct nlmsghdr *nlh;
2903 
2904 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2905 	if (nlh == NULL)
2906 		return -EMSGSIZE;
2907 
2908 	ur = nlmsg_data(nlh);
2909 	ur->proto = proto;
2910 	memcpy(&ur->sel, sel, sizeof(ur->sel));
2911 
2912 	if (addr) {
2913 		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2914 		if (err) {
2915 			nlmsg_cancel(skb, nlh);
2916 			return err;
2917 		}
2918 	}
2919 	return nlmsg_end(skb, nlh);
2920 }
2921 
2922 static int xfrm_send_report(struct net *net, u8 proto,
2923 			    struct xfrm_selector *sel, xfrm_address_t *addr)
2924 {
2925 	struct sk_buff *skb;
2926 
2927 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2928 	if (skb == NULL)
2929 		return -ENOMEM;
2930 
2931 	if (build_report(skb, proto, sel, addr) < 0)
2932 		BUG();
2933 
2934 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2935 }
2936 
2937 static inline size_t xfrm_mapping_msgsize(void)
2938 {
2939 	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2940 }
2941 
2942 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2943 			 xfrm_address_t *new_saddr, __be16 new_sport)
2944 {
2945 	struct xfrm_user_mapping *um;
2946 	struct nlmsghdr *nlh;
2947 
2948 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2949 	if (nlh == NULL)
2950 		return -EMSGSIZE;
2951 
2952 	um = nlmsg_data(nlh);
2953 
2954 	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2955 	um->id.spi = x->id.spi;
2956 	um->id.family = x->props.family;
2957 	um->id.proto = x->id.proto;
2958 	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2959 	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2960 	um->new_sport = new_sport;
2961 	um->old_sport = x->encap->encap_sport;
2962 	um->reqid = x->props.reqid;
2963 
2964 	return nlmsg_end(skb, nlh);
2965 }
2966 
2967 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2968 			     __be16 sport)
2969 {
2970 	struct net *net = xs_net(x);
2971 	struct sk_buff *skb;
2972 
2973 	if (x->id.proto != IPPROTO_ESP)
2974 		return -EINVAL;
2975 
2976 	if (!x->encap)
2977 		return -EINVAL;
2978 
2979 	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2980 	if (skb == NULL)
2981 		return -ENOMEM;
2982 
2983 	if (build_mapping(skb, x, ipaddr, sport) < 0)
2984 		BUG();
2985 
2986 	return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2987 }
2988 
2989 static struct xfrm_mgr netlink_mgr = {
2990 	.id		= "netlink",
2991 	.notify		= xfrm_send_state_notify,
2992 	.acquire	= xfrm_send_acquire,
2993 	.compile_policy	= xfrm_compile_policy,
2994 	.notify_policy	= xfrm_send_policy_notify,
2995 	.report		= xfrm_send_report,
2996 	.migrate	= xfrm_send_migrate,
2997 	.new_mapping	= xfrm_send_mapping,
2998 };
2999 
3000 static int __net_init xfrm_user_net_init(struct net *net)
3001 {
3002 	struct sock *nlsk;
3003 	struct netlink_kernel_cfg cfg = {
3004 		.groups	= XFRMNLGRP_MAX,
3005 		.input	= xfrm_netlink_rcv,
3006 	};
3007 
3008 	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3009 	if (nlsk == NULL)
3010 		return -ENOMEM;
3011 	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3012 	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3013 	return 0;
3014 }
3015 
3016 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3017 {
3018 	struct net *net;
3019 	list_for_each_entry(net, net_exit_list, exit_list)
3020 		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3021 	synchronize_net();
3022 	list_for_each_entry(net, net_exit_list, exit_list)
3023 		netlink_kernel_release(net->xfrm.nlsk_stash);
3024 }
3025 
3026 static struct pernet_operations xfrm_user_net_ops = {
3027 	.init	    = xfrm_user_net_init,
3028 	.exit_batch = xfrm_user_net_exit,
3029 };
3030 
3031 static int __init xfrm_user_init(void)
3032 {
3033 	int rv;
3034 
3035 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3036 
3037 	rv = register_pernet_subsys(&xfrm_user_net_ops);
3038 	if (rv < 0)
3039 		return rv;
3040 	rv = xfrm_register_km(&netlink_mgr);
3041 	if (rv < 0)
3042 		unregister_pernet_subsys(&xfrm_user_net_ops);
3043 	return rv;
3044 }
3045 
3046 static void __exit xfrm_user_exit(void)
3047 {
3048 	xfrm_unregister_km(&netlink_mgr);
3049 	unregister_pernet_subsys(&xfrm_user_net_ops);
3050 }
3051 
3052 module_init(xfrm_user_init);
3053 module_exit(xfrm_user_exit);
3054 MODULE_LICENSE("GPL");
3055 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3056 
3057