xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision 33ac9dba)
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 int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
36 {
37 	struct nlattr *rt = attrs[type];
38 	struct xfrm_algo *algp;
39 
40 	if (!rt)
41 		return 0;
42 
43 	algp = nla_data(rt);
44 	if (nla_len(rt) < xfrm_alg_len(algp))
45 		return -EINVAL;
46 
47 	switch (type) {
48 	case XFRMA_ALG_AUTH:
49 	case XFRMA_ALG_CRYPT:
50 	case XFRMA_ALG_COMP:
51 		break;
52 
53 	default:
54 		return -EINVAL;
55 	}
56 
57 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 	return 0;
59 }
60 
61 static int verify_auth_trunc(struct nlattr **attrs)
62 {
63 	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 	struct xfrm_algo_auth *algp;
65 
66 	if (!rt)
67 		return 0;
68 
69 	algp = nla_data(rt);
70 	if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 		return -EINVAL;
72 
73 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 	return 0;
75 }
76 
77 static int verify_aead(struct nlattr **attrs)
78 {
79 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 	struct xfrm_algo_aead *algp;
81 
82 	if (!rt)
83 		return 0;
84 
85 	algp = nla_data(rt);
86 	if (nla_len(rt) < aead_len(algp))
87 		return -EINVAL;
88 
89 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 	return 0;
91 }
92 
93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 			   xfrm_address_t **addrp)
95 {
96 	struct nlattr *rt = attrs[type];
97 
98 	if (rt && addrp)
99 		*addrp = nla_data(rt);
100 }
101 
102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
103 {
104 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 	struct xfrm_user_sec_ctx *uctx;
106 
107 	if (!rt)
108 		return 0;
109 
110 	uctx = nla_data(rt);
111 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112 		return -EINVAL;
113 
114 	return 0;
115 }
116 
117 static inline int verify_replay(struct xfrm_usersa_info *p,
118 				struct nlattr **attrs)
119 {
120 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 	struct xfrm_replay_state_esn *rs;
122 
123 	if (p->flags & XFRM_STATE_ESN) {
124 		if (!rt)
125 			return -EINVAL;
126 
127 		rs = nla_data(rt);
128 
129 		if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 			return -EINVAL;
131 
132 		if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 		    nla_len(rt) != sizeof(*rs))
134 			return -EINVAL;
135 	}
136 
137 	if (!rt)
138 		return 0;
139 
140 	/* As only ESP and AH support ESN feature. */
141 	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142 		return -EINVAL;
143 
144 	if (p->replay_window != 0)
145 		return -EINVAL;
146 
147 	return 0;
148 }
149 
150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151 			     struct nlattr **attrs)
152 {
153 	int err;
154 
155 	err = -EINVAL;
156 	switch (p->family) {
157 	case AF_INET:
158 		break;
159 
160 	case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162 		break;
163 #else
164 		err = -EAFNOSUPPORT;
165 		goto out;
166 #endif
167 
168 	default:
169 		goto out;
170 	}
171 
172 	err = -EINVAL;
173 	switch (p->id.proto) {
174 	case IPPROTO_AH:
175 		if ((!attrs[XFRMA_ALG_AUTH]	&&
176 		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 		    attrs[XFRMA_ALG_AEAD]	||
178 		    attrs[XFRMA_ALG_CRYPT]	||
179 		    attrs[XFRMA_ALG_COMP]	||
180 		    attrs[XFRMA_TFCPAD])
181 			goto out;
182 		break;
183 
184 	case IPPROTO_ESP:
185 		if (attrs[XFRMA_ALG_COMP])
186 			goto out;
187 		if (!attrs[XFRMA_ALG_AUTH] &&
188 		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189 		    !attrs[XFRMA_ALG_CRYPT] &&
190 		    !attrs[XFRMA_ALG_AEAD])
191 			goto out;
192 		if ((attrs[XFRMA_ALG_AUTH] ||
193 		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
194 		     attrs[XFRMA_ALG_CRYPT]) &&
195 		    attrs[XFRMA_ALG_AEAD])
196 			goto out;
197 		if (attrs[XFRMA_TFCPAD] &&
198 		    p->mode != XFRM_MODE_TUNNEL)
199 			goto out;
200 		break;
201 
202 	case IPPROTO_COMP:
203 		if (!attrs[XFRMA_ALG_COMP]	||
204 		    attrs[XFRMA_ALG_AEAD]	||
205 		    attrs[XFRMA_ALG_AUTH]	||
206 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
207 		    attrs[XFRMA_ALG_CRYPT]	||
208 		    attrs[XFRMA_TFCPAD]		||
209 		    (ntohl(p->id.spi) >= 0x10000))
210 			goto out;
211 		break;
212 
213 #if IS_ENABLED(CONFIG_IPV6)
214 	case IPPROTO_DSTOPTS:
215 	case IPPROTO_ROUTING:
216 		if (attrs[XFRMA_ALG_COMP]	||
217 		    attrs[XFRMA_ALG_AUTH]	||
218 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
219 		    attrs[XFRMA_ALG_AEAD]	||
220 		    attrs[XFRMA_ALG_CRYPT]	||
221 		    attrs[XFRMA_ENCAP]		||
222 		    attrs[XFRMA_SEC_CTX]	||
223 		    attrs[XFRMA_TFCPAD]		||
224 		    !attrs[XFRMA_COADDR])
225 			goto out;
226 		break;
227 #endif
228 
229 	default:
230 		goto out;
231 	}
232 
233 	if ((err = verify_aead(attrs)))
234 		goto out;
235 	if ((err = verify_auth_trunc(attrs)))
236 		goto out;
237 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
238 		goto out;
239 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
240 		goto out;
241 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
242 		goto out;
243 	if ((err = verify_sec_ctx_len(attrs)))
244 		goto out;
245 	if ((err = verify_replay(p, attrs)))
246 		goto out;
247 
248 	err = -EINVAL;
249 	switch (p->mode) {
250 	case XFRM_MODE_TRANSPORT:
251 	case XFRM_MODE_TUNNEL:
252 	case XFRM_MODE_ROUTEOPTIMIZATION:
253 	case XFRM_MODE_BEET:
254 		break;
255 
256 	default:
257 		goto out;
258 	}
259 
260 	err = 0;
261 
262 out:
263 	return err;
264 }
265 
266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267 			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
268 			   struct nlattr *rta)
269 {
270 	struct xfrm_algo *p, *ualg;
271 	struct xfrm_algo_desc *algo;
272 
273 	if (!rta)
274 		return 0;
275 
276 	ualg = nla_data(rta);
277 
278 	algo = get_byname(ualg->alg_name, 1);
279 	if (!algo)
280 		return -ENOSYS;
281 	*props = algo->desc.sadb_alg_id;
282 
283 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
284 	if (!p)
285 		return -ENOMEM;
286 
287 	strcpy(p->alg_name, algo->name);
288 	*algpp = p;
289 	return 0;
290 }
291 
292 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
293 		       struct nlattr *rta)
294 {
295 	struct xfrm_algo *ualg;
296 	struct xfrm_algo_auth *p;
297 	struct xfrm_algo_desc *algo;
298 
299 	if (!rta)
300 		return 0;
301 
302 	ualg = nla_data(rta);
303 
304 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
305 	if (!algo)
306 		return -ENOSYS;
307 	*props = algo->desc.sadb_alg_id;
308 
309 	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
310 	if (!p)
311 		return -ENOMEM;
312 
313 	strcpy(p->alg_name, algo->name);
314 	p->alg_key_len = ualg->alg_key_len;
315 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
316 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
317 
318 	*algpp = p;
319 	return 0;
320 }
321 
322 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
323 			     struct nlattr *rta)
324 {
325 	struct xfrm_algo_auth *p, *ualg;
326 	struct xfrm_algo_desc *algo;
327 
328 	if (!rta)
329 		return 0;
330 
331 	ualg = nla_data(rta);
332 
333 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
334 	if (!algo)
335 		return -ENOSYS;
336 	if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
337 	    ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
338 		return -EINVAL;
339 	*props = algo->desc.sadb_alg_id;
340 
341 	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
342 	if (!p)
343 		return -ENOMEM;
344 
345 	strcpy(p->alg_name, algo->name);
346 	if (!p->alg_trunc_len)
347 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
348 
349 	*algpp = p;
350 	return 0;
351 }
352 
353 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
354 		       struct nlattr *rta)
355 {
356 	struct xfrm_algo_aead *p, *ualg;
357 	struct xfrm_algo_desc *algo;
358 
359 	if (!rta)
360 		return 0;
361 
362 	ualg = nla_data(rta);
363 
364 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
365 	if (!algo)
366 		return -ENOSYS;
367 	*props = algo->desc.sadb_alg_id;
368 
369 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
370 	if (!p)
371 		return -ENOMEM;
372 
373 	strcpy(p->alg_name, algo->name);
374 	*algpp = p;
375 	return 0;
376 }
377 
378 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
379 					 struct nlattr *rp)
380 {
381 	struct xfrm_replay_state_esn *up;
382 	int ulen;
383 
384 	if (!replay_esn || !rp)
385 		return 0;
386 
387 	up = nla_data(rp);
388 	ulen = xfrm_replay_state_esn_len(up);
389 
390 	if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
391 		return -EINVAL;
392 
393 	return 0;
394 }
395 
396 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
397 				       struct xfrm_replay_state_esn **preplay_esn,
398 				       struct nlattr *rta)
399 {
400 	struct xfrm_replay_state_esn *p, *pp, *up;
401 	int klen, ulen;
402 
403 	if (!rta)
404 		return 0;
405 
406 	up = nla_data(rta);
407 	klen = xfrm_replay_state_esn_len(up);
408 	ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
409 
410 	p = kzalloc(klen, GFP_KERNEL);
411 	if (!p)
412 		return -ENOMEM;
413 
414 	pp = kzalloc(klen, GFP_KERNEL);
415 	if (!pp) {
416 		kfree(p);
417 		return -ENOMEM;
418 	}
419 
420 	memcpy(p, up, ulen);
421 	memcpy(pp, up, ulen);
422 
423 	*replay_esn = p;
424 	*preplay_esn = pp;
425 
426 	return 0;
427 }
428 
429 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
430 {
431 	int len = 0;
432 
433 	if (xfrm_ctx) {
434 		len += sizeof(struct xfrm_user_sec_ctx);
435 		len += xfrm_ctx->ctx_len;
436 	}
437 	return len;
438 }
439 
440 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
441 {
442 	memcpy(&x->id, &p->id, sizeof(x->id));
443 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
444 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
445 	x->props.mode = p->mode;
446 	x->props.replay_window = min_t(unsigned int, p->replay_window,
447 					sizeof(x->replay.bitmap) * 8);
448 	x->props.reqid = p->reqid;
449 	x->props.family = p->family;
450 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
451 	x->props.flags = p->flags;
452 
453 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
454 		x->sel.family = p->family;
455 }
456 
457 /*
458  * someday when pfkey also has support, we could have the code
459  * somehow made shareable and move it to xfrm_state.c - JHS
460  *
461 */
462 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
463 				  int update_esn)
464 {
465 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
466 	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
467 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
468 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
469 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
470 
471 	if (re) {
472 		struct xfrm_replay_state_esn *replay_esn;
473 		replay_esn = nla_data(re);
474 		memcpy(x->replay_esn, replay_esn,
475 		       xfrm_replay_state_esn_len(replay_esn));
476 		memcpy(x->preplay_esn, replay_esn,
477 		       xfrm_replay_state_esn_len(replay_esn));
478 	}
479 
480 	if (rp) {
481 		struct xfrm_replay_state *replay;
482 		replay = nla_data(rp);
483 		memcpy(&x->replay, replay, sizeof(*replay));
484 		memcpy(&x->preplay, replay, sizeof(*replay));
485 	}
486 
487 	if (lt) {
488 		struct xfrm_lifetime_cur *ltime;
489 		ltime = nla_data(lt);
490 		x->curlft.bytes = ltime->bytes;
491 		x->curlft.packets = ltime->packets;
492 		x->curlft.add_time = ltime->add_time;
493 		x->curlft.use_time = ltime->use_time;
494 	}
495 
496 	if (et)
497 		x->replay_maxage = nla_get_u32(et);
498 
499 	if (rt)
500 		x->replay_maxdiff = nla_get_u32(rt);
501 }
502 
503 static struct xfrm_state *xfrm_state_construct(struct net *net,
504 					       struct xfrm_usersa_info *p,
505 					       struct nlattr **attrs,
506 					       int *errp)
507 {
508 	struct xfrm_state *x = xfrm_state_alloc(net);
509 	int err = -ENOMEM;
510 
511 	if (!x)
512 		goto error_no_put;
513 
514 	copy_from_user_state(x, p);
515 
516 	if (attrs[XFRMA_SA_EXTRA_FLAGS])
517 		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
518 
519 	if ((err = attach_aead(&x->aead, &x->props.ealgo,
520 			       attrs[XFRMA_ALG_AEAD])))
521 		goto error;
522 	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
523 				     attrs[XFRMA_ALG_AUTH_TRUNC])))
524 		goto error;
525 	if (!x->props.aalgo) {
526 		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
527 				       attrs[XFRMA_ALG_AUTH])))
528 			goto error;
529 	}
530 	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
531 				   xfrm_ealg_get_byname,
532 				   attrs[XFRMA_ALG_CRYPT])))
533 		goto error;
534 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
535 				   xfrm_calg_get_byname,
536 				   attrs[XFRMA_ALG_COMP])))
537 		goto error;
538 
539 	if (attrs[XFRMA_ENCAP]) {
540 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
541 				   sizeof(*x->encap), GFP_KERNEL);
542 		if (x->encap == NULL)
543 			goto error;
544 	}
545 
546 	if (attrs[XFRMA_TFCPAD])
547 		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
548 
549 	if (attrs[XFRMA_COADDR]) {
550 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
551 				    sizeof(*x->coaddr), GFP_KERNEL);
552 		if (x->coaddr == NULL)
553 			goto error;
554 	}
555 
556 	xfrm_mark_get(attrs, &x->mark);
557 
558 	err = __xfrm_init_state(x, false);
559 	if (err)
560 		goto error;
561 
562 	if (attrs[XFRMA_SEC_CTX] &&
563 	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
564 		goto error;
565 
566 	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
567 					       attrs[XFRMA_REPLAY_ESN_VAL])))
568 		goto error;
569 
570 	x->km.seq = p->seq;
571 	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
572 	/* sysctl_xfrm_aevent_etime is in 100ms units */
573 	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
574 
575 	if ((err = xfrm_init_replay(x)))
576 		goto error;
577 
578 	/* override default values from above */
579 	xfrm_update_ae_params(x, attrs, 0);
580 
581 	return x;
582 
583 error:
584 	x->km.state = XFRM_STATE_DEAD;
585 	xfrm_state_put(x);
586 error_no_put:
587 	*errp = err;
588 	return NULL;
589 }
590 
591 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
592 		struct nlattr **attrs)
593 {
594 	struct net *net = sock_net(skb->sk);
595 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
596 	struct xfrm_state *x;
597 	int err;
598 	struct km_event c;
599 
600 	err = verify_newsa_info(p, attrs);
601 	if (err)
602 		return err;
603 
604 	x = xfrm_state_construct(net, p, attrs, &err);
605 	if (!x)
606 		return err;
607 
608 	xfrm_state_hold(x);
609 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
610 		err = xfrm_state_add(x);
611 	else
612 		err = xfrm_state_update(x);
613 
614 	xfrm_audit_state_add(x, err ? 0 : 1, true);
615 
616 	if (err < 0) {
617 		x->km.state = XFRM_STATE_DEAD;
618 		__xfrm_state_put(x);
619 		goto out;
620 	}
621 
622 	c.seq = nlh->nlmsg_seq;
623 	c.portid = nlh->nlmsg_pid;
624 	c.event = nlh->nlmsg_type;
625 
626 	km_state_notify(x, &c);
627 out:
628 	xfrm_state_put(x);
629 	return err;
630 }
631 
632 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
633 						 struct xfrm_usersa_id *p,
634 						 struct nlattr **attrs,
635 						 int *errp)
636 {
637 	struct xfrm_state *x = NULL;
638 	struct xfrm_mark m;
639 	int err;
640 	u32 mark = xfrm_mark_get(attrs, &m);
641 
642 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
643 		err = -ESRCH;
644 		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
645 	} else {
646 		xfrm_address_t *saddr = NULL;
647 
648 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
649 		if (!saddr) {
650 			err = -EINVAL;
651 			goto out;
652 		}
653 
654 		err = -ESRCH;
655 		x = xfrm_state_lookup_byaddr(net, mark,
656 					     &p->daddr, saddr,
657 					     p->proto, p->family);
658 	}
659 
660  out:
661 	if (!x && errp)
662 		*errp = err;
663 	return x;
664 }
665 
666 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
667 		struct nlattr **attrs)
668 {
669 	struct net *net = sock_net(skb->sk);
670 	struct xfrm_state *x;
671 	int err = -ESRCH;
672 	struct km_event c;
673 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
674 
675 	x = xfrm_user_state_lookup(net, p, attrs, &err);
676 	if (x == NULL)
677 		return err;
678 
679 	if ((err = security_xfrm_state_delete(x)) != 0)
680 		goto out;
681 
682 	if (xfrm_state_kern(x)) {
683 		err = -EPERM;
684 		goto out;
685 	}
686 
687 	err = xfrm_state_delete(x);
688 
689 	if (err < 0)
690 		goto out;
691 
692 	c.seq = nlh->nlmsg_seq;
693 	c.portid = nlh->nlmsg_pid;
694 	c.event = nlh->nlmsg_type;
695 	km_state_notify(x, &c);
696 
697 out:
698 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
699 	xfrm_state_put(x);
700 	return err;
701 }
702 
703 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
704 {
705 	memset(p, 0, sizeof(*p));
706 	memcpy(&p->id, &x->id, sizeof(p->id));
707 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
708 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
709 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
710 	memcpy(&p->stats, &x->stats, sizeof(p->stats));
711 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
712 	p->mode = x->props.mode;
713 	p->replay_window = x->props.replay_window;
714 	p->reqid = x->props.reqid;
715 	p->family = x->props.family;
716 	p->flags = x->props.flags;
717 	p->seq = x->km.seq;
718 }
719 
720 struct xfrm_dump_info {
721 	struct sk_buff *in_skb;
722 	struct sk_buff *out_skb;
723 	u32 nlmsg_seq;
724 	u16 nlmsg_flags;
725 };
726 
727 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
728 {
729 	struct xfrm_user_sec_ctx *uctx;
730 	struct nlattr *attr;
731 	int ctx_size = sizeof(*uctx) + s->ctx_len;
732 
733 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
734 	if (attr == NULL)
735 		return -EMSGSIZE;
736 
737 	uctx = nla_data(attr);
738 	uctx->exttype = XFRMA_SEC_CTX;
739 	uctx->len = ctx_size;
740 	uctx->ctx_doi = s->ctx_doi;
741 	uctx->ctx_alg = s->ctx_alg;
742 	uctx->ctx_len = s->ctx_len;
743 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
744 
745 	return 0;
746 }
747 
748 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
749 {
750 	struct xfrm_algo *algo;
751 	struct nlattr *nla;
752 
753 	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
754 			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
755 	if (!nla)
756 		return -EMSGSIZE;
757 
758 	algo = nla_data(nla);
759 	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
760 	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
761 	algo->alg_key_len = auth->alg_key_len;
762 
763 	return 0;
764 }
765 
766 /* Don't change this without updating xfrm_sa_len! */
767 static int copy_to_user_state_extra(struct xfrm_state *x,
768 				    struct xfrm_usersa_info *p,
769 				    struct sk_buff *skb)
770 {
771 	int ret = 0;
772 
773 	copy_to_user_state(x, p);
774 
775 	if (x->props.extra_flags) {
776 		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
777 				  x->props.extra_flags);
778 		if (ret)
779 			goto out;
780 	}
781 
782 	if (x->coaddr) {
783 		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
784 		if (ret)
785 			goto out;
786 	}
787 	if (x->lastused) {
788 		ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
789 		if (ret)
790 			goto out;
791 	}
792 	if (x->aead) {
793 		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
794 		if (ret)
795 			goto out;
796 	}
797 	if (x->aalg) {
798 		ret = copy_to_user_auth(x->aalg, skb);
799 		if (!ret)
800 			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
801 				      xfrm_alg_auth_len(x->aalg), x->aalg);
802 		if (ret)
803 			goto out;
804 	}
805 	if (x->ealg) {
806 		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
807 		if (ret)
808 			goto out;
809 	}
810 	if (x->calg) {
811 		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
812 		if (ret)
813 			goto out;
814 	}
815 	if (x->encap) {
816 		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
817 		if (ret)
818 			goto out;
819 	}
820 	if (x->tfcpad) {
821 		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
822 		if (ret)
823 			goto out;
824 	}
825 	ret = xfrm_mark_put(skb, &x->mark);
826 	if (ret)
827 		goto out;
828 	if (x->replay_esn) {
829 		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
830 			      xfrm_replay_state_esn_len(x->replay_esn),
831 			      x->replay_esn);
832 		if (ret)
833 			goto out;
834 	}
835 	if (x->security)
836 		ret = copy_sec_ctx(x->security, skb);
837 out:
838 	return ret;
839 }
840 
841 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
842 {
843 	struct xfrm_dump_info *sp = ptr;
844 	struct sk_buff *in_skb = sp->in_skb;
845 	struct sk_buff *skb = sp->out_skb;
846 	struct xfrm_usersa_info *p;
847 	struct nlmsghdr *nlh;
848 	int err;
849 
850 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
851 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
852 	if (nlh == NULL)
853 		return -EMSGSIZE;
854 
855 	p = nlmsg_data(nlh);
856 
857 	err = copy_to_user_state_extra(x, p, skb);
858 	if (err) {
859 		nlmsg_cancel(skb, nlh);
860 		return err;
861 	}
862 	nlmsg_end(skb, nlh);
863 	return 0;
864 }
865 
866 static int xfrm_dump_sa_done(struct netlink_callback *cb)
867 {
868 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
869 	struct sock *sk = cb->skb->sk;
870 	struct net *net = sock_net(sk);
871 
872 	xfrm_state_walk_done(walk, net);
873 	return 0;
874 }
875 
876 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
877 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
878 {
879 	struct net *net = sock_net(skb->sk);
880 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
881 	struct xfrm_dump_info info;
882 
883 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
884 		     sizeof(cb->args) - sizeof(cb->args[0]));
885 
886 	info.in_skb = cb->skb;
887 	info.out_skb = skb;
888 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
889 	info.nlmsg_flags = NLM_F_MULTI;
890 
891 	if (!cb->args[0]) {
892 		struct nlattr *attrs[XFRMA_MAX+1];
893 		struct xfrm_address_filter *filter = NULL;
894 		u8 proto = 0;
895 		int err;
896 
897 		cb->args[0] = 1;
898 
899 		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
900 				  xfrma_policy);
901 		if (err < 0)
902 			return err;
903 
904 		if (attrs[XFRMA_ADDRESS_FILTER]) {
905 			filter = kmalloc(sizeof(*filter), GFP_KERNEL);
906 			if (filter == NULL)
907 				return -ENOMEM;
908 
909 			memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
910 			       sizeof(*filter));
911 		}
912 
913 		if (attrs[XFRMA_PROTO])
914 			proto = nla_get_u8(attrs[XFRMA_PROTO]);
915 
916 		xfrm_state_walk_init(walk, proto, filter);
917 	}
918 
919 	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
920 
921 	return skb->len;
922 }
923 
924 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
925 					  struct xfrm_state *x, u32 seq)
926 {
927 	struct xfrm_dump_info info;
928 	struct sk_buff *skb;
929 	int err;
930 
931 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
932 	if (!skb)
933 		return ERR_PTR(-ENOMEM);
934 
935 	info.in_skb = in_skb;
936 	info.out_skb = skb;
937 	info.nlmsg_seq = seq;
938 	info.nlmsg_flags = 0;
939 
940 	err = dump_one_state(x, 0, &info);
941 	if (err) {
942 		kfree_skb(skb);
943 		return ERR_PTR(err);
944 	}
945 
946 	return skb;
947 }
948 
949 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
950  * Must be called with RCU read lock.
951  */
952 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
953 				       u32 pid, unsigned int group)
954 {
955 	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
956 
957 	if (nlsk)
958 		return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
959 	else
960 		return -1;
961 }
962 
963 static inline size_t xfrm_spdinfo_msgsize(void)
964 {
965 	return NLMSG_ALIGN(4)
966 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
967 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo));
968 }
969 
970 static int build_spdinfo(struct sk_buff *skb, struct net *net,
971 			 u32 portid, u32 seq, u32 flags)
972 {
973 	struct xfrmk_spdinfo si;
974 	struct xfrmu_spdinfo spc;
975 	struct xfrmu_spdhinfo sph;
976 	struct nlmsghdr *nlh;
977 	int err;
978 	u32 *f;
979 
980 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
981 	if (nlh == NULL) /* shouldn't really happen ... */
982 		return -EMSGSIZE;
983 
984 	f = nlmsg_data(nlh);
985 	*f = flags;
986 	xfrm_spd_getinfo(net, &si);
987 	spc.incnt = si.incnt;
988 	spc.outcnt = si.outcnt;
989 	spc.fwdcnt = si.fwdcnt;
990 	spc.inscnt = si.inscnt;
991 	spc.outscnt = si.outscnt;
992 	spc.fwdscnt = si.fwdscnt;
993 	sph.spdhcnt = si.spdhcnt;
994 	sph.spdhmcnt = si.spdhmcnt;
995 
996 	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
997 	if (!err)
998 		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
999 	if (err) {
1000 		nlmsg_cancel(skb, nlh);
1001 		return err;
1002 	}
1003 
1004 	return nlmsg_end(skb, nlh);
1005 }
1006 
1007 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1008 		struct nlattr **attrs)
1009 {
1010 	struct net *net = sock_net(skb->sk);
1011 	struct sk_buff *r_skb;
1012 	u32 *flags = nlmsg_data(nlh);
1013 	u32 sportid = NETLINK_CB(skb).portid;
1014 	u32 seq = nlh->nlmsg_seq;
1015 
1016 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1017 	if (r_skb == NULL)
1018 		return -ENOMEM;
1019 
1020 	if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1021 		BUG();
1022 
1023 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1024 }
1025 
1026 static inline size_t xfrm_sadinfo_msgsize(void)
1027 {
1028 	return NLMSG_ALIGN(4)
1029 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1030 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1031 }
1032 
1033 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1034 			 u32 portid, u32 seq, u32 flags)
1035 {
1036 	struct xfrmk_sadinfo si;
1037 	struct xfrmu_sadhinfo sh;
1038 	struct nlmsghdr *nlh;
1039 	int err;
1040 	u32 *f;
1041 
1042 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1043 	if (nlh == NULL) /* shouldn't really happen ... */
1044 		return -EMSGSIZE;
1045 
1046 	f = nlmsg_data(nlh);
1047 	*f = flags;
1048 	xfrm_sad_getinfo(net, &si);
1049 
1050 	sh.sadhmcnt = si.sadhmcnt;
1051 	sh.sadhcnt = si.sadhcnt;
1052 
1053 	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1054 	if (!err)
1055 		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1056 	if (err) {
1057 		nlmsg_cancel(skb, nlh);
1058 		return err;
1059 	}
1060 
1061 	return nlmsg_end(skb, nlh);
1062 }
1063 
1064 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1065 		struct nlattr **attrs)
1066 {
1067 	struct net *net = sock_net(skb->sk);
1068 	struct sk_buff *r_skb;
1069 	u32 *flags = nlmsg_data(nlh);
1070 	u32 sportid = NETLINK_CB(skb).portid;
1071 	u32 seq = nlh->nlmsg_seq;
1072 
1073 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1074 	if (r_skb == NULL)
1075 		return -ENOMEM;
1076 
1077 	if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1078 		BUG();
1079 
1080 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1081 }
1082 
1083 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1084 		struct nlattr **attrs)
1085 {
1086 	struct net *net = sock_net(skb->sk);
1087 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1088 	struct xfrm_state *x;
1089 	struct sk_buff *resp_skb;
1090 	int err = -ESRCH;
1091 
1092 	x = xfrm_user_state_lookup(net, p, attrs, &err);
1093 	if (x == NULL)
1094 		goto out_noput;
1095 
1096 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1097 	if (IS_ERR(resp_skb)) {
1098 		err = PTR_ERR(resp_skb);
1099 	} else {
1100 		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1101 	}
1102 	xfrm_state_put(x);
1103 out_noput:
1104 	return err;
1105 }
1106 
1107 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1108 		struct nlattr **attrs)
1109 {
1110 	struct net *net = sock_net(skb->sk);
1111 	struct xfrm_state *x;
1112 	struct xfrm_userspi_info *p;
1113 	struct sk_buff *resp_skb;
1114 	xfrm_address_t *daddr;
1115 	int family;
1116 	int err;
1117 	u32 mark;
1118 	struct xfrm_mark m;
1119 
1120 	p = nlmsg_data(nlh);
1121 	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1122 	if (err)
1123 		goto out_noput;
1124 
1125 	family = p->info.family;
1126 	daddr = &p->info.id.daddr;
1127 
1128 	x = NULL;
1129 
1130 	mark = xfrm_mark_get(attrs, &m);
1131 	if (p->info.seq) {
1132 		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1133 		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1134 			xfrm_state_put(x);
1135 			x = NULL;
1136 		}
1137 	}
1138 
1139 	if (!x)
1140 		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1141 				  p->info.id.proto, daddr,
1142 				  &p->info.saddr, 1,
1143 				  family);
1144 	err = -ENOENT;
1145 	if (x == NULL)
1146 		goto out_noput;
1147 
1148 	err = xfrm_alloc_spi(x, p->min, p->max);
1149 	if (err)
1150 		goto out;
1151 
1152 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1153 	if (IS_ERR(resp_skb)) {
1154 		err = PTR_ERR(resp_skb);
1155 		goto out;
1156 	}
1157 
1158 	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1159 
1160 out:
1161 	xfrm_state_put(x);
1162 out_noput:
1163 	return err;
1164 }
1165 
1166 static int verify_policy_dir(u8 dir)
1167 {
1168 	switch (dir) {
1169 	case XFRM_POLICY_IN:
1170 	case XFRM_POLICY_OUT:
1171 	case XFRM_POLICY_FWD:
1172 		break;
1173 
1174 	default:
1175 		return -EINVAL;
1176 	}
1177 
1178 	return 0;
1179 }
1180 
1181 static int verify_policy_type(u8 type)
1182 {
1183 	switch (type) {
1184 	case XFRM_POLICY_TYPE_MAIN:
1185 #ifdef CONFIG_XFRM_SUB_POLICY
1186 	case XFRM_POLICY_TYPE_SUB:
1187 #endif
1188 		break;
1189 
1190 	default:
1191 		return -EINVAL;
1192 	}
1193 
1194 	return 0;
1195 }
1196 
1197 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1198 {
1199 	int ret;
1200 
1201 	switch (p->share) {
1202 	case XFRM_SHARE_ANY:
1203 	case XFRM_SHARE_SESSION:
1204 	case XFRM_SHARE_USER:
1205 	case XFRM_SHARE_UNIQUE:
1206 		break;
1207 
1208 	default:
1209 		return -EINVAL;
1210 	}
1211 
1212 	switch (p->action) {
1213 	case XFRM_POLICY_ALLOW:
1214 	case XFRM_POLICY_BLOCK:
1215 		break;
1216 
1217 	default:
1218 		return -EINVAL;
1219 	}
1220 
1221 	switch (p->sel.family) {
1222 	case AF_INET:
1223 		break;
1224 
1225 	case AF_INET6:
1226 #if IS_ENABLED(CONFIG_IPV6)
1227 		break;
1228 #else
1229 		return  -EAFNOSUPPORT;
1230 #endif
1231 
1232 	default:
1233 		return -EINVAL;
1234 	}
1235 
1236 	ret = verify_policy_dir(p->dir);
1237 	if (ret)
1238 		return ret;
1239 	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1240 		return -EINVAL;
1241 
1242 	return 0;
1243 }
1244 
1245 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1246 {
1247 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1248 	struct xfrm_user_sec_ctx *uctx;
1249 
1250 	if (!rt)
1251 		return 0;
1252 
1253 	uctx = nla_data(rt);
1254 	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1255 }
1256 
1257 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1258 			   int nr)
1259 {
1260 	int i;
1261 
1262 	xp->xfrm_nr = nr;
1263 	for (i = 0; i < nr; i++, ut++) {
1264 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1265 
1266 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1267 		memcpy(&t->saddr, &ut->saddr,
1268 		       sizeof(xfrm_address_t));
1269 		t->reqid = ut->reqid;
1270 		t->mode = ut->mode;
1271 		t->share = ut->share;
1272 		t->optional = ut->optional;
1273 		t->aalgos = ut->aalgos;
1274 		t->ealgos = ut->ealgos;
1275 		t->calgos = ut->calgos;
1276 		/* If all masks are ~0, then we allow all algorithms. */
1277 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1278 		t->encap_family = ut->family;
1279 	}
1280 }
1281 
1282 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1283 {
1284 	int i;
1285 
1286 	if (nr > XFRM_MAX_DEPTH)
1287 		return -EINVAL;
1288 
1289 	for (i = 0; i < nr; i++) {
1290 		/* We never validated the ut->family value, so many
1291 		 * applications simply leave it at zero.  The check was
1292 		 * never made and ut->family was ignored because all
1293 		 * templates could be assumed to have the same family as
1294 		 * the policy itself.  Now that we will have ipv4-in-ipv6
1295 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1296 		 */
1297 		if (!ut[i].family)
1298 			ut[i].family = family;
1299 
1300 		switch (ut[i].family) {
1301 		case AF_INET:
1302 			break;
1303 #if IS_ENABLED(CONFIG_IPV6)
1304 		case AF_INET6:
1305 			break;
1306 #endif
1307 		default:
1308 			return -EINVAL;
1309 		}
1310 	}
1311 
1312 	return 0;
1313 }
1314 
1315 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1316 {
1317 	struct nlattr *rt = attrs[XFRMA_TMPL];
1318 
1319 	if (!rt) {
1320 		pol->xfrm_nr = 0;
1321 	} else {
1322 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1323 		int nr = nla_len(rt) / sizeof(*utmpl);
1324 		int err;
1325 
1326 		err = validate_tmpl(nr, utmpl, pol->family);
1327 		if (err)
1328 			return err;
1329 
1330 		copy_templates(pol, utmpl, nr);
1331 	}
1332 	return 0;
1333 }
1334 
1335 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1336 {
1337 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1338 	struct xfrm_userpolicy_type *upt;
1339 	u8 type = XFRM_POLICY_TYPE_MAIN;
1340 	int err;
1341 
1342 	if (rt) {
1343 		upt = nla_data(rt);
1344 		type = upt->type;
1345 	}
1346 
1347 	err = verify_policy_type(type);
1348 	if (err)
1349 		return err;
1350 
1351 	*tp = type;
1352 	return 0;
1353 }
1354 
1355 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1356 {
1357 	xp->priority = p->priority;
1358 	xp->index = p->index;
1359 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1360 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1361 	xp->action = p->action;
1362 	xp->flags = p->flags;
1363 	xp->family = p->sel.family;
1364 	/* XXX xp->share = p->share; */
1365 }
1366 
1367 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1368 {
1369 	memset(p, 0, sizeof(*p));
1370 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1371 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1372 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1373 	p->priority = xp->priority;
1374 	p->index = xp->index;
1375 	p->sel.family = xp->family;
1376 	p->dir = dir;
1377 	p->action = xp->action;
1378 	p->flags = xp->flags;
1379 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1380 }
1381 
1382 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1383 {
1384 	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1385 	int err;
1386 
1387 	if (!xp) {
1388 		*errp = -ENOMEM;
1389 		return NULL;
1390 	}
1391 
1392 	copy_from_user_policy(xp, p);
1393 
1394 	err = copy_from_user_policy_type(&xp->type, attrs);
1395 	if (err)
1396 		goto error;
1397 
1398 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1399 		err = copy_from_user_sec_ctx(xp, attrs);
1400 	if (err)
1401 		goto error;
1402 
1403 	xfrm_mark_get(attrs, &xp->mark);
1404 
1405 	return xp;
1406  error:
1407 	*errp = err;
1408 	xp->walk.dead = 1;
1409 	xfrm_policy_destroy(xp);
1410 	return NULL;
1411 }
1412 
1413 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1414 		struct nlattr **attrs)
1415 {
1416 	struct net *net = sock_net(skb->sk);
1417 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1418 	struct xfrm_policy *xp;
1419 	struct km_event c;
1420 	int err;
1421 	int excl;
1422 
1423 	err = verify_newpolicy_info(p);
1424 	if (err)
1425 		return err;
1426 	err = verify_sec_ctx_len(attrs);
1427 	if (err)
1428 		return err;
1429 
1430 	xp = xfrm_policy_construct(net, p, attrs, &err);
1431 	if (!xp)
1432 		return err;
1433 
1434 	/* shouldn't excl be based on nlh flags??
1435 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1436 	 * in netlink excl is a flag and you wouldnt need
1437 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1438 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1439 	err = xfrm_policy_insert(p->dir, xp, excl);
1440 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1441 
1442 	if (err) {
1443 		security_xfrm_policy_free(xp->security);
1444 		kfree(xp);
1445 		return err;
1446 	}
1447 
1448 	c.event = nlh->nlmsg_type;
1449 	c.seq = nlh->nlmsg_seq;
1450 	c.portid = nlh->nlmsg_pid;
1451 	km_policy_notify(xp, p->dir, &c);
1452 
1453 	xfrm_pol_put(xp);
1454 
1455 	return 0;
1456 }
1457 
1458 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1459 {
1460 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1461 	int i;
1462 
1463 	if (xp->xfrm_nr == 0)
1464 		return 0;
1465 
1466 	for (i = 0; i < xp->xfrm_nr; i++) {
1467 		struct xfrm_user_tmpl *up = &vec[i];
1468 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1469 
1470 		memset(up, 0, sizeof(*up));
1471 		memcpy(&up->id, &kp->id, sizeof(up->id));
1472 		up->family = kp->encap_family;
1473 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1474 		up->reqid = kp->reqid;
1475 		up->mode = kp->mode;
1476 		up->share = kp->share;
1477 		up->optional = kp->optional;
1478 		up->aalgos = kp->aalgos;
1479 		up->ealgos = kp->ealgos;
1480 		up->calgos = kp->calgos;
1481 	}
1482 
1483 	return nla_put(skb, XFRMA_TMPL,
1484 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1485 }
1486 
1487 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1488 {
1489 	if (x->security) {
1490 		return copy_sec_ctx(x->security, skb);
1491 	}
1492 	return 0;
1493 }
1494 
1495 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1496 {
1497 	if (xp->security)
1498 		return copy_sec_ctx(xp->security, skb);
1499 	return 0;
1500 }
1501 static inline size_t userpolicy_type_attrsize(void)
1502 {
1503 #ifdef CONFIG_XFRM_SUB_POLICY
1504 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1505 #else
1506 	return 0;
1507 #endif
1508 }
1509 
1510 #ifdef CONFIG_XFRM_SUB_POLICY
1511 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1512 {
1513 	struct xfrm_userpolicy_type upt = {
1514 		.type = type,
1515 	};
1516 
1517 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1518 }
1519 
1520 #else
1521 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1522 {
1523 	return 0;
1524 }
1525 #endif
1526 
1527 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1528 {
1529 	struct xfrm_dump_info *sp = ptr;
1530 	struct xfrm_userpolicy_info *p;
1531 	struct sk_buff *in_skb = sp->in_skb;
1532 	struct sk_buff *skb = sp->out_skb;
1533 	struct nlmsghdr *nlh;
1534 	int err;
1535 
1536 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1537 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1538 	if (nlh == NULL)
1539 		return -EMSGSIZE;
1540 
1541 	p = nlmsg_data(nlh);
1542 	copy_to_user_policy(xp, p, dir);
1543 	err = copy_to_user_tmpl(xp, skb);
1544 	if (!err)
1545 		err = copy_to_user_sec_ctx(xp, skb);
1546 	if (!err)
1547 		err = copy_to_user_policy_type(xp->type, skb);
1548 	if (!err)
1549 		err = xfrm_mark_put(skb, &xp->mark);
1550 	if (err) {
1551 		nlmsg_cancel(skb, nlh);
1552 		return err;
1553 	}
1554 	nlmsg_end(skb, nlh);
1555 	return 0;
1556 }
1557 
1558 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1559 {
1560 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1561 	struct net *net = sock_net(cb->skb->sk);
1562 
1563 	xfrm_policy_walk_done(walk, net);
1564 	return 0;
1565 }
1566 
1567 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1568 {
1569 	struct net *net = sock_net(skb->sk);
1570 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1571 	struct xfrm_dump_info info;
1572 
1573 	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1574 		     sizeof(cb->args) - sizeof(cb->args[0]));
1575 
1576 	info.in_skb = cb->skb;
1577 	info.out_skb = skb;
1578 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1579 	info.nlmsg_flags = NLM_F_MULTI;
1580 
1581 	if (!cb->args[0]) {
1582 		cb->args[0] = 1;
1583 		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1584 	}
1585 
1586 	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1587 
1588 	return skb->len;
1589 }
1590 
1591 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1592 					  struct xfrm_policy *xp,
1593 					  int dir, u32 seq)
1594 {
1595 	struct xfrm_dump_info info;
1596 	struct sk_buff *skb;
1597 	int err;
1598 
1599 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1600 	if (!skb)
1601 		return ERR_PTR(-ENOMEM);
1602 
1603 	info.in_skb = in_skb;
1604 	info.out_skb = skb;
1605 	info.nlmsg_seq = seq;
1606 	info.nlmsg_flags = 0;
1607 
1608 	err = dump_one_policy(xp, dir, 0, &info);
1609 	if (err) {
1610 		kfree_skb(skb);
1611 		return ERR_PTR(err);
1612 	}
1613 
1614 	return skb;
1615 }
1616 
1617 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1618 		struct nlattr **attrs)
1619 {
1620 	struct net *net = sock_net(skb->sk);
1621 	struct xfrm_policy *xp;
1622 	struct xfrm_userpolicy_id *p;
1623 	u8 type = XFRM_POLICY_TYPE_MAIN;
1624 	int err;
1625 	struct km_event c;
1626 	int delete;
1627 	struct xfrm_mark m;
1628 	u32 mark = xfrm_mark_get(attrs, &m);
1629 
1630 	p = nlmsg_data(nlh);
1631 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1632 
1633 	err = copy_from_user_policy_type(&type, attrs);
1634 	if (err)
1635 		return err;
1636 
1637 	err = verify_policy_dir(p->dir);
1638 	if (err)
1639 		return err;
1640 
1641 	if (p->index)
1642 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1643 	else {
1644 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1645 		struct xfrm_sec_ctx *ctx;
1646 
1647 		err = verify_sec_ctx_len(attrs);
1648 		if (err)
1649 			return err;
1650 
1651 		ctx = NULL;
1652 		if (rt) {
1653 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1654 
1655 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1656 			if (err)
1657 				return err;
1658 		}
1659 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1660 					   ctx, delete, &err);
1661 		security_xfrm_policy_free(ctx);
1662 	}
1663 	if (xp == NULL)
1664 		return -ENOENT;
1665 
1666 	if (!delete) {
1667 		struct sk_buff *resp_skb;
1668 
1669 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1670 		if (IS_ERR(resp_skb)) {
1671 			err = PTR_ERR(resp_skb);
1672 		} else {
1673 			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1674 					    NETLINK_CB(skb).portid);
1675 		}
1676 	} else {
1677 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1678 
1679 		if (err != 0)
1680 			goto out;
1681 
1682 		c.data.byid = p->index;
1683 		c.event = nlh->nlmsg_type;
1684 		c.seq = nlh->nlmsg_seq;
1685 		c.portid = nlh->nlmsg_pid;
1686 		km_policy_notify(xp, p->dir, &c);
1687 	}
1688 
1689 out:
1690 	xfrm_pol_put(xp);
1691 	if (delete && err == 0)
1692 		xfrm_garbage_collect(net);
1693 	return err;
1694 }
1695 
1696 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1697 		struct nlattr **attrs)
1698 {
1699 	struct net *net = sock_net(skb->sk);
1700 	struct km_event c;
1701 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1702 	int err;
1703 
1704 	err = xfrm_state_flush(net, p->proto, true);
1705 	if (err) {
1706 		if (err == -ESRCH) /* empty table */
1707 			return 0;
1708 		return err;
1709 	}
1710 	c.data.proto = p->proto;
1711 	c.event = nlh->nlmsg_type;
1712 	c.seq = nlh->nlmsg_seq;
1713 	c.portid = nlh->nlmsg_pid;
1714 	c.net = net;
1715 	km_state_notify(NULL, &c);
1716 
1717 	return 0;
1718 }
1719 
1720 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1721 {
1722 	size_t replay_size = x->replay_esn ?
1723 			      xfrm_replay_state_esn_len(x->replay_esn) :
1724 			      sizeof(struct xfrm_replay_state);
1725 
1726 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1727 	       + nla_total_size(replay_size)
1728 	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1729 	       + nla_total_size(sizeof(struct xfrm_mark))
1730 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1731 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1732 }
1733 
1734 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1735 {
1736 	struct xfrm_aevent_id *id;
1737 	struct nlmsghdr *nlh;
1738 	int err;
1739 
1740 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1741 	if (nlh == NULL)
1742 		return -EMSGSIZE;
1743 
1744 	id = nlmsg_data(nlh);
1745 	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1746 	id->sa_id.spi = x->id.spi;
1747 	id->sa_id.family = x->props.family;
1748 	id->sa_id.proto = x->id.proto;
1749 	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1750 	id->reqid = x->props.reqid;
1751 	id->flags = c->data.aevent;
1752 
1753 	if (x->replay_esn) {
1754 		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1755 			      xfrm_replay_state_esn_len(x->replay_esn),
1756 			      x->replay_esn);
1757 	} else {
1758 		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1759 			      &x->replay);
1760 	}
1761 	if (err)
1762 		goto out_cancel;
1763 	err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1764 	if (err)
1765 		goto out_cancel;
1766 
1767 	if (id->flags & XFRM_AE_RTHR) {
1768 		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1769 		if (err)
1770 			goto out_cancel;
1771 	}
1772 	if (id->flags & XFRM_AE_ETHR) {
1773 		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1774 				  x->replay_maxage * 10 / HZ);
1775 		if (err)
1776 			goto out_cancel;
1777 	}
1778 	err = xfrm_mark_put(skb, &x->mark);
1779 	if (err)
1780 		goto out_cancel;
1781 
1782 	return nlmsg_end(skb, nlh);
1783 
1784 out_cancel:
1785 	nlmsg_cancel(skb, nlh);
1786 	return err;
1787 }
1788 
1789 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1790 		struct nlattr **attrs)
1791 {
1792 	struct net *net = sock_net(skb->sk);
1793 	struct xfrm_state *x;
1794 	struct sk_buff *r_skb;
1795 	int err;
1796 	struct km_event c;
1797 	u32 mark;
1798 	struct xfrm_mark m;
1799 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1800 	struct xfrm_usersa_id *id = &p->sa_id;
1801 
1802 	mark = xfrm_mark_get(attrs, &m);
1803 
1804 	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1805 	if (x == NULL)
1806 		return -ESRCH;
1807 
1808 	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1809 	if (r_skb == NULL) {
1810 		xfrm_state_put(x);
1811 		return -ENOMEM;
1812 	}
1813 
1814 	/*
1815 	 * XXX: is this lock really needed - none of the other
1816 	 * gets lock (the concern is things getting updated
1817 	 * while we are still reading) - jhs
1818 	*/
1819 	spin_lock_bh(&x->lock);
1820 	c.data.aevent = p->flags;
1821 	c.seq = nlh->nlmsg_seq;
1822 	c.portid = nlh->nlmsg_pid;
1823 
1824 	if (build_aevent(r_skb, x, &c) < 0)
1825 		BUG();
1826 	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1827 	spin_unlock_bh(&x->lock);
1828 	xfrm_state_put(x);
1829 	return err;
1830 }
1831 
1832 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1833 		struct nlattr **attrs)
1834 {
1835 	struct net *net = sock_net(skb->sk);
1836 	struct xfrm_state *x;
1837 	struct km_event c;
1838 	int err = -EINVAL;
1839 	u32 mark = 0;
1840 	struct xfrm_mark m;
1841 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1842 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1843 	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1844 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1845 
1846 	if (!lt && !rp && !re)
1847 		return err;
1848 
1849 	/* pedantic mode - thou shalt sayeth replaceth */
1850 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1851 		return err;
1852 
1853 	mark = xfrm_mark_get(attrs, &m);
1854 
1855 	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1856 	if (x == NULL)
1857 		return -ESRCH;
1858 
1859 	if (x->km.state != XFRM_STATE_VALID)
1860 		goto out;
1861 
1862 	err = xfrm_replay_verify_len(x->replay_esn, re);
1863 	if (err)
1864 		goto out;
1865 
1866 	spin_lock_bh(&x->lock);
1867 	xfrm_update_ae_params(x, attrs, 1);
1868 	spin_unlock_bh(&x->lock);
1869 
1870 	c.event = nlh->nlmsg_type;
1871 	c.seq = nlh->nlmsg_seq;
1872 	c.portid = nlh->nlmsg_pid;
1873 	c.data.aevent = XFRM_AE_CU;
1874 	km_state_notify(x, &c);
1875 	err = 0;
1876 out:
1877 	xfrm_state_put(x);
1878 	return err;
1879 }
1880 
1881 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1882 		struct nlattr **attrs)
1883 {
1884 	struct net *net = sock_net(skb->sk);
1885 	struct km_event c;
1886 	u8 type = XFRM_POLICY_TYPE_MAIN;
1887 	int err;
1888 
1889 	err = copy_from_user_policy_type(&type, attrs);
1890 	if (err)
1891 		return err;
1892 
1893 	err = xfrm_policy_flush(net, type, true);
1894 	if (err) {
1895 		if (err == -ESRCH) /* empty table */
1896 			return 0;
1897 		return err;
1898 	}
1899 
1900 	c.data.type = type;
1901 	c.event = nlh->nlmsg_type;
1902 	c.seq = nlh->nlmsg_seq;
1903 	c.portid = nlh->nlmsg_pid;
1904 	c.net = net;
1905 	km_policy_notify(NULL, 0, &c);
1906 	return 0;
1907 }
1908 
1909 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1910 		struct nlattr **attrs)
1911 {
1912 	struct net *net = sock_net(skb->sk);
1913 	struct xfrm_policy *xp;
1914 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1915 	struct xfrm_userpolicy_info *p = &up->pol;
1916 	u8 type = XFRM_POLICY_TYPE_MAIN;
1917 	int err = -ENOENT;
1918 	struct xfrm_mark m;
1919 	u32 mark = xfrm_mark_get(attrs, &m);
1920 
1921 	err = copy_from_user_policy_type(&type, attrs);
1922 	if (err)
1923 		return err;
1924 
1925 	err = verify_policy_dir(p->dir);
1926 	if (err)
1927 		return err;
1928 
1929 	if (p->index)
1930 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1931 	else {
1932 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1933 		struct xfrm_sec_ctx *ctx;
1934 
1935 		err = verify_sec_ctx_len(attrs);
1936 		if (err)
1937 			return err;
1938 
1939 		ctx = NULL;
1940 		if (rt) {
1941 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1942 
1943 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1944 			if (err)
1945 				return err;
1946 		}
1947 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1948 					   &p->sel, ctx, 0, &err);
1949 		security_xfrm_policy_free(ctx);
1950 	}
1951 	if (xp == NULL)
1952 		return -ENOENT;
1953 
1954 	if (unlikely(xp->walk.dead))
1955 		goto out;
1956 
1957 	err = 0;
1958 	if (up->hard) {
1959 		xfrm_policy_delete(xp, p->dir);
1960 		xfrm_audit_policy_delete(xp, 1, true);
1961 	} else {
1962 		// reset the timers here?
1963 		WARN(1, "Dont know what to do with soft policy expire\n");
1964 	}
1965 	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1966 
1967 out:
1968 	xfrm_pol_put(xp);
1969 	return err;
1970 }
1971 
1972 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1973 		struct nlattr **attrs)
1974 {
1975 	struct net *net = sock_net(skb->sk);
1976 	struct xfrm_state *x;
1977 	int err;
1978 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
1979 	struct xfrm_usersa_info *p = &ue->state;
1980 	struct xfrm_mark m;
1981 	u32 mark = xfrm_mark_get(attrs, &m);
1982 
1983 	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1984 
1985 	err = -ENOENT;
1986 	if (x == NULL)
1987 		return err;
1988 
1989 	spin_lock_bh(&x->lock);
1990 	err = -EINVAL;
1991 	if (x->km.state != XFRM_STATE_VALID)
1992 		goto out;
1993 	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
1994 
1995 	if (ue->hard) {
1996 		__xfrm_state_delete(x);
1997 		xfrm_audit_state_delete(x, 1, true);
1998 	}
1999 	err = 0;
2000 out:
2001 	spin_unlock_bh(&x->lock);
2002 	xfrm_state_put(x);
2003 	return err;
2004 }
2005 
2006 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2007 		struct nlattr **attrs)
2008 {
2009 	struct net *net = sock_net(skb->sk);
2010 	struct xfrm_policy *xp;
2011 	struct xfrm_user_tmpl *ut;
2012 	int i;
2013 	struct nlattr *rt = attrs[XFRMA_TMPL];
2014 	struct xfrm_mark mark;
2015 
2016 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2017 	struct xfrm_state *x = xfrm_state_alloc(net);
2018 	int err = -ENOMEM;
2019 
2020 	if (!x)
2021 		goto nomem;
2022 
2023 	xfrm_mark_get(attrs, &mark);
2024 
2025 	err = verify_newpolicy_info(&ua->policy);
2026 	if (err)
2027 		goto bad_policy;
2028 
2029 	/*   build an XP */
2030 	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2031 	if (!xp)
2032 		goto free_state;
2033 
2034 	memcpy(&x->id, &ua->id, sizeof(ua->id));
2035 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2036 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2037 	xp->mark.m = x->mark.m = mark.m;
2038 	xp->mark.v = x->mark.v = mark.v;
2039 	ut = nla_data(rt);
2040 	/* extract the templates and for each call km_key */
2041 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2042 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2043 		memcpy(&x->id, &t->id, sizeof(x->id));
2044 		x->props.mode = t->mode;
2045 		x->props.reqid = t->reqid;
2046 		x->props.family = ut->family;
2047 		t->aalgos = ua->aalgos;
2048 		t->ealgos = ua->ealgos;
2049 		t->calgos = ua->calgos;
2050 		err = km_query(x, t, xp);
2051 
2052 	}
2053 
2054 	kfree(x);
2055 	kfree(xp);
2056 
2057 	return 0;
2058 
2059 bad_policy:
2060 	WARN(1, "BAD policy passed\n");
2061 free_state:
2062 	kfree(x);
2063 nomem:
2064 	return err;
2065 }
2066 
2067 #ifdef CONFIG_XFRM_MIGRATE
2068 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2069 				  struct xfrm_kmaddress *k,
2070 				  struct nlattr **attrs, int *num)
2071 {
2072 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2073 	struct xfrm_user_migrate *um;
2074 	int i, num_migrate;
2075 
2076 	if (k != NULL) {
2077 		struct xfrm_user_kmaddress *uk;
2078 
2079 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2080 		memcpy(&k->local, &uk->local, sizeof(k->local));
2081 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2082 		k->family = uk->family;
2083 		k->reserved = uk->reserved;
2084 	}
2085 
2086 	um = nla_data(rt);
2087 	num_migrate = nla_len(rt) / sizeof(*um);
2088 
2089 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2090 		return -EINVAL;
2091 
2092 	for (i = 0; i < num_migrate; i++, um++, ma++) {
2093 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2094 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2095 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2096 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2097 
2098 		ma->proto = um->proto;
2099 		ma->mode = um->mode;
2100 		ma->reqid = um->reqid;
2101 
2102 		ma->old_family = um->old_family;
2103 		ma->new_family = um->new_family;
2104 	}
2105 
2106 	*num = i;
2107 	return 0;
2108 }
2109 
2110 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2111 			   struct nlattr **attrs)
2112 {
2113 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2114 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2115 	struct xfrm_kmaddress km, *kmp;
2116 	u8 type;
2117 	int err;
2118 	int n = 0;
2119 	struct net *net = sock_net(skb->sk);
2120 
2121 	if (attrs[XFRMA_MIGRATE] == NULL)
2122 		return -EINVAL;
2123 
2124 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2125 
2126 	err = copy_from_user_policy_type(&type, attrs);
2127 	if (err)
2128 		return err;
2129 
2130 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2131 	if (err)
2132 		return err;
2133 
2134 	if (!n)
2135 		return 0;
2136 
2137 	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2138 
2139 	return 0;
2140 }
2141 #else
2142 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2143 			   struct nlattr **attrs)
2144 {
2145 	return -ENOPROTOOPT;
2146 }
2147 #endif
2148 
2149 #ifdef CONFIG_XFRM_MIGRATE
2150 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2151 {
2152 	struct xfrm_user_migrate um;
2153 
2154 	memset(&um, 0, sizeof(um));
2155 	um.proto = m->proto;
2156 	um.mode = m->mode;
2157 	um.reqid = m->reqid;
2158 	um.old_family = m->old_family;
2159 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2160 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2161 	um.new_family = m->new_family;
2162 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2163 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2164 
2165 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2166 }
2167 
2168 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2169 {
2170 	struct xfrm_user_kmaddress uk;
2171 
2172 	memset(&uk, 0, sizeof(uk));
2173 	uk.family = k->family;
2174 	uk.reserved = k->reserved;
2175 	memcpy(&uk.local, &k->local, sizeof(uk.local));
2176 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2177 
2178 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2179 }
2180 
2181 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2182 {
2183 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2184 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2185 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2186 	      + userpolicy_type_attrsize();
2187 }
2188 
2189 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2190 			 int num_migrate, const struct xfrm_kmaddress *k,
2191 			 const struct xfrm_selector *sel, u8 dir, u8 type)
2192 {
2193 	const struct xfrm_migrate *mp;
2194 	struct xfrm_userpolicy_id *pol_id;
2195 	struct nlmsghdr *nlh;
2196 	int i, err;
2197 
2198 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2199 	if (nlh == NULL)
2200 		return -EMSGSIZE;
2201 
2202 	pol_id = nlmsg_data(nlh);
2203 	/* copy data from selector, dir, and type to the pol_id */
2204 	memset(pol_id, 0, sizeof(*pol_id));
2205 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2206 	pol_id->dir = dir;
2207 
2208 	if (k != NULL) {
2209 		err = copy_to_user_kmaddress(k, skb);
2210 		if (err)
2211 			goto out_cancel;
2212 	}
2213 	err = copy_to_user_policy_type(type, skb);
2214 	if (err)
2215 		goto out_cancel;
2216 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2217 		err = copy_to_user_migrate(mp, skb);
2218 		if (err)
2219 			goto out_cancel;
2220 	}
2221 
2222 	return nlmsg_end(skb, nlh);
2223 
2224 out_cancel:
2225 	nlmsg_cancel(skb, nlh);
2226 	return err;
2227 }
2228 
2229 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2230 			     const struct xfrm_migrate *m, int num_migrate,
2231 			     const struct xfrm_kmaddress *k)
2232 {
2233 	struct net *net = &init_net;
2234 	struct sk_buff *skb;
2235 
2236 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2237 	if (skb == NULL)
2238 		return -ENOMEM;
2239 
2240 	/* build migrate */
2241 	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2242 		BUG();
2243 
2244 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2245 }
2246 #else
2247 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2248 			     const struct xfrm_migrate *m, int num_migrate,
2249 			     const struct xfrm_kmaddress *k)
2250 {
2251 	return -ENOPROTOOPT;
2252 }
2253 #endif
2254 
2255 #define XMSGSIZE(type) sizeof(struct type)
2256 
2257 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2258 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2259 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2261 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2262 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2264 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2265 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2266 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2267 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2268 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2269 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2270 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2271 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2272 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2274 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2275 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2276 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2277 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2278 };
2279 
2280 #undef XMSGSIZE
2281 
2282 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2283 	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2284 	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2285 	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2286 	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2287 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2288 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2289 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2290 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2291 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2292 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2293 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2294 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2295 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2296 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2297 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2298 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2299 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2300 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2301 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2302 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2303 	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2304 	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2305 	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2306 	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2307 	[XFRMA_PROTO]		= { .type = NLA_U8 },
2308 	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2309 };
2310 
2311 static const struct xfrm_link {
2312 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2313 	int (*dump)(struct sk_buff *, struct netlink_callback *);
2314 	int (*done)(struct netlink_callback *);
2315 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2316 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2317 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2318 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2319 						   .dump = xfrm_dump_sa,
2320 						   .done = xfrm_dump_sa_done  },
2321 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2322 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2323 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2324 						   .dump = xfrm_dump_policy,
2325 						   .done = xfrm_dump_policy_done },
2326 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2327 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2328 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2329 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2330 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2331 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2332 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2333 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2334 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2335 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2336 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2337 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2338 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2339 };
2340 
2341 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2342 {
2343 	struct net *net = sock_net(skb->sk);
2344 	struct nlattr *attrs[XFRMA_MAX+1];
2345 	const struct xfrm_link *link;
2346 	int type, err;
2347 
2348 	type = nlh->nlmsg_type;
2349 	if (type > XFRM_MSG_MAX)
2350 		return -EINVAL;
2351 
2352 	type -= XFRM_MSG_BASE;
2353 	link = &xfrm_dispatch[type];
2354 
2355 	/* All operations require privileges, even GET */
2356 	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2357 		return -EPERM;
2358 
2359 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2360 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2361 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2362 		if (link->dump == NULL)
2363 			return -EINVAL;
2364 
2365 		{
2366 			struct netlink_dump_control c = {
2367 				.dump = link->dump,
2368 				.done = link->done,
2369 			};
2370 			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2371 		}
2372 	}
2373 
2374 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2375 			  xfrma_policy);
2376 	if (err < 0)
2377 		return err;
2378 
2379 	if (link->doit == NULL)
2380 		return -EINVAL;
2381 
2382 	return link->doit(skb, nlh, attrs);
2383 }
2384 
2385 static void xfrm_netlink_rcv(struct sk_buff *skb)
2386 {
2387 	struct net *net = sock_net(skb->sk);
2388 
2389 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2390 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2391 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2392 }
2393 
2394 static inline size_t xfrm_expire_msgsize(void)
2395 {
2396 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2397 	       + nla_total_size(sizeof(struct xfrm_mark));
2398 }
2399 
2400 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2401 {
2402 	struct xfrm_user_expire *ue;
2403 	struct nlmsghdr *nlh;
2404 	int err;
2405 
2406 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2407 	if (nlh == NULL)
2408 		return -EMSGSIZE;
2409 
2410 	ue = nlmsg_data(nlh);
2411 	copy_to_user_state(x, &ue->state);
2412 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2413 
2414 	err = xfrm_mark_put(skb, &x->mark);
2415 	if (err)
2416 		return err;
2417 
2418 	return nlmsg_end(skb, nlh);
2419 }
2420 
2421 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2422 {
2423 	struct net *net = xs_net(x);
2424 	struct sk_buff *skb;
2425 
2426 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2427 	if (skb == NULL)
2428 		return -ENOMEM;
2429 
2430 	if (build_expire(skb, x, c) < 0) {
2431 		kfree_skb(skb);
2432 		return -EMSGSIZE;
2433 	}
2434 
2435 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2436 }
2437 
2438 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2439 {
2440 	struct net *net = xs_net(x);
2441 	struct sk_buff *skb;
2442 
2443 	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2444 	if (skb == NULL)
2445 		return -ENOMEM;
2446 
2447 	if (build_aevent(skb, x, c) < 0)
2448 		BUG();
2449 
2450 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2451 }
2452 
2453 static int xfrm_notify_sa_flush(const struct km_event *c)
2454 {
2455 	struct net *net = c->net;
2456 	struct xfrm_usersa_flush *p;
2457 	struct nlmsghdr *nlh;
2458 	struct sk_buff *skb;
2459 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2460 
2461 	skb = nlmsg_new(len, GFP_ATOMIC);
2462 	if (skb == NULL)
2463 		return -ENOMEM;
2464 
2465 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2466 	if (nlh == NULL) {
2467 		kfree_skb(skb);
2468 		return -EMSGSIZE;
2469 	}
2470 
2471 	p = nlmsg_data(nlh);
2472 	p->proto = c->data.proto;
2473 
2474 	nlmsg_end(skb, nlh);
2475 
2476 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2477 }
2478 
2479 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2480 {
2481 	size_t l = 0;
2482 	if (x->aead)
2483 		l += nla_total_size(aead_len(x->aead));
2484 	if (x->aalg) {
2485 		l += nla_total_size(sizeof(struct xfrm_algo) +
2486 				    (x->aalg->alg_key_len + 7) / 8);
2487 		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2488 	}
2489 	if (x->ealg)
2490 		l += nla_total_size(xfrm_alg_len(x->ealg));
2491 	if (x->calg)
2492 		l += nla_total_size(sizeof(*x->calg));
2493 	if (x->encap)
2494 		l += nla_total_size(sizeof(*x->encap));
2495 	if (x->tfcpad)
2496 		l += nla_total_size(sizeof(x->tfcpad));
2497 	if (x->replay_esn)
2498 		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2499 	if (x->security)
2500 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2501 				    x->security->ctx_len);
2502 	if (x->coaddr)
2503 		l += nla_total_size(sizeof(*x->coaddr));
2504 	if (x->props.extra_flags)
2505 		l += nla_total_size(sizeof(x->props.extra_flags));
2506 
2507 	/* Must count x->lastused as it may become non-zero behind our back. */
2508 	l += nla_total_size(sizeof(u64));
2509 
2510 	return l;
2511 }
2512 
2513 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2514 {
2515 	struct net *net = xs_net(x);
2516 	struct xfrm_usersa_info *p;
2517 	struct xfrm_usersa_id *id;
2518 	struct nlmsghdr *nlh;
2519 	struct sk_buff *skb;
2520 	int len = xfrm_sa_len(x);
2521 	int headlen, err;
2522 
2523 	headlen = sizeof(*p);
2524 	if (c->event == XFRM_MSG_DELSA) {
2525 		len += nla_total_size(headlen);
2526 		headlen = sizeof(*id);
2527 		len += nla_total_size(sizeof(struct xfrm_mark));
2528 	}
2529 	len += NLMSG_ALIGN(headlen);
2530 
2531 	skb = nlmsg_new(len, GFP_ATOMIC);
2532 	if (skb == NULL)
2533 		return -ENOMEM;
2534 
2535 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2536 	err = -EMSGSIZE;
2537 	if (nlh == NULL)
2538 		goto out_free_skb;
2539 
2540 	p = nlmsg_data(nlh);
2541 	if (c->event == XFRM_MSG_DELSA) {
2542 		struct nlattr *attr;
2543 
2544 		id = nlmsg_data(nlh);
2545 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2546 		id->spi = x->id.spi;
2547 		id->family = x->props.family;
2548 		id->proto = x->id.proto;
2549 
2550 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2551 		err = -EMSGSIZE;
2552 		if (attr == NULL)
2553 			goto out_free_skb;
2554 
2555 		p = nla_data(attr);
2556 	}
2557 	err = copy_to_user_state_extra(x, p, skb);
2558 	if (err)
2559 		goto out_free_skb;
2560 
2561 	nlmsg_end(skb, nlh);
2562 
2563 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2564 
2565 out_free_skb:
2566 	kfree_skb(skb);
2567 	return err;
2568 }
2569 
2570 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2571 {
2572 
2573 	switch (c->event) {
2574 	case XFRM_MSG_EXPIRE:
2575 		return xfrm_exp_state_notify(x, c);
2576 	case XFRM_MSG_NEWAE:
2577 		return xfrm_aevent_state_notify(x, c);
2578 	case XFRM_MSG_DELSA:
2579 	case XFRM_MSG_UPDSA:
2580 	case XFRM_MSG_NEWSA:
2581 		return xfrm_notify_sa(x, c);
2582 	case XFRM_MSG_FLUSHSA:
2583 		return xfrm_notify_sa_flush(c);
2584 	default:
2585 		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2586 		       c->event);
2587 		break;
2588 	}
2589 
2590 	return 0;
2591 
2592 }
2593 
2594 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2595 					  struct xfrm_policy *xp)
2596 {
2597 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2598 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2599 	       + nla_total_size(sizeof(struct xfrm_mark))
2600 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2601 	       + userpolicy_type_attrsize();
2602 }
2603 
2604 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2605 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2606 {
2607 	__u32 seq = xfrm_get_acqseq();
2608 	struct xfrm_user_acquire *ua;
2609 	struct nlmsghdr *nlh;
2610 	int err;
2611 
2612 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2613 	if (nlh == NULL)
2614 		return -EMSGSIZE;
2615 
2616 	ua = nlmsg_data(nlh);
2617 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2618 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2619 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2620 	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2621 	ua->aalgos = xt->aalgos;
2622 	ua->ealgos = xt->ealgos;
2623 	ua->calgos = xt->calgos;
2624 	ua->seq = x->km.seq = seq;
2625 
2626 	err = copy_to_user_tmpl(xp, skb);
2627 	if (!err)
2628 		err = copy_to_user_state_sec_ctx(x, skb);
2629 	if (!err)
2630 		err = copy_to_user_policy_type(xp->type, skb);
2631 	if (!err)
2632 		err = xfrm_mark_put(skb, &xp->mark);
2633 	if (err) {
2634 		nlmsg_cancel(skb, nlh);
2635 		return err;
2636 	}
2637 
2638 	return nlmsg_end(skb, nlh);
2639 }
2640 
2641 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2642 			     struct xfrm_policy *xp)
2643 {
2644 	struct net *net = xs_net(x);
2645 	struct sk_buff *skb;
2646 
2647 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2648 	if (skb == NULL)
2649 		return -ENOMEM;
2650 
2651 	if (build_acquire(skb, x, xt, xp) < 0)
2652 		BUG();
2653 
2654 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2655 }
2656 
2657 /* User gives us xfrm_user_policy_info followed by an array of 0
2658  * or more templates.
2659  */
2660 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2661 					       u8 *data, int len, int *dir)
2662 {
2663 	struct net *net = sock_net(sk);
2664 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2665 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2666 	struct xfrm_policy *xp;
2667 	int nr;
2668 
2669 	switch (sk->sk_family) {
2670 	case AF_INET:
2671 		if (opt != IP_XFRM_POLICY) {
2672 			*dir = -EOPNOTSUPP;
2673 			return NULL;
2674 		}
2675 		break;
2676 #if IS_ENABLED(CONFIG_IPV6)
2677 	case AF_INET6:
2678 		if (opt != IPV6_XFRM_POLICY) {
2679 			*dir = -EOPNOTSUPP;
2680 			return NULL;
2681 		}
2682 		break;
2683 #endif
2684 	default:
2685 		*dir = -EINVAL;
2686 		return NULL;
2687 	}
2688 
2689 	*dir = -EINVAL;
2690 
2691 	if (len < sizeof(*p) ||
2692 	    verify_newpolicy_info(p))
2693 		return NULL;
2694 
2695 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2696 	if (validate_tmpl(nr, ut, p->sel.family))
2697 		return NULL;
2698 
2699 	if (p->dir > XFRM_POLICY_OUT)
2700 		return NULL;
2701 
2702 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2703 	if (xp == NULL) {
2704 		*dir = -ENOBUFS;
2705 		return NULL;
2706 	}
2707 
2708 	copy_from_user_policy(xp, p);
2709 	xp->type = XFRM_POLICY_TYPE_MAIN;
2710 	copy_templates(xp, ut, nr);
2711 
2712 	*dir = p->dir;
2713 
2714 	return xp;
2715 }
2716 
2717 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2718 {
2719 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2720 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2721 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2722 	       + nla_total_size(sizeof(struct xfrm_mark))
2723 	       + userpolicy_type_attrsize();
2724 }
2725 
2726 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2727 			   int dir, const struct km_event *c)
2728 {
2729 	struct xfrm_user_polexpire *upe;
2730 	int hard = c->data.hard;
2731 	struct nlmsghdr *nlh;
2732 	int err;
2733 
2734 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2735 	if (nlh == NULL)
2736 		return -EMSGSIZE;
2737 
2738 	upe = nlmsg_data(nlh);
2739 	copy_to_user_policy(xp, &upe->pol, dir);
2740 	err = copy_to_user_tmpl(xp, skb);
2741 	if (!err)
2742 		err = copy_to_user_sec_ctx(xp, skb);
2743 	if (!err)
2744 		err = copy_to_user_policy_type(xp->type, skb);
2745 	if (!err)
2746 		err = xfrm_mark_put(skb, &xp->mark);
2747 	if (err) {
2748 		nlmsg_cancel(skb, nlh);
2749 		return err;
2750 	}
2751 	upe->hard = !!hard;
2752 
2753 	return nlmsg_end(skb, nlh);
2754 }
2755 
2756 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2757 {
2758 	struct net *net = xp_net(xp);
2759 	struct sk_buff *skb;
2760 
2761 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2762 	if (skb == NULL)
2763 		return -ENOMEM;
2764 
2765 	if (build_polexpire(skb, xp, dir, c) < 0)
2766 		BUG();
2767 
2768 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2769 }
2770 
2771 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2772 {
2773 	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2774 	struct net *net = xp_net(xp);
2775 	struct xfrm_userpolicy_info *p;
2776 	struct xfrm_userpolicy_id *id;
2777 	struct nlmsghdr *nlh;
2778 	struct sk_buff *skb;
2779 	int headlen, err;
2780 
2781 	headlen = sizeof(*p);
2782 	if (c->event == XFRM_MSG_DELPOLICY) {
2783 		len += nla_total_size(headlen);
2784 		headlen = sizeof(*id);
2785 	}
2786 	len += userpolicy_type_attrsize();
2787 	len += nla_total_size(sizeof(struct xfrm_mark));
2788 	len += NLMSG_ALIGN(headlen);
2789 
2790 	skb = nlmsg_new(len, GFP_ATOMIC);
2791 	if (skb == NULL)
2792 		return -ENOMEM;
2793 
2794 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2795 	err = -EMSGSIZE;
2796 	if (nlh == NULL)
2797 		goto out_free_skb;
2798 
2799 	p = nlmsg_data(nlh);
2800 	if (c->event == XFRM_MSG_DELPOLICY) {
2801 		struct nlattr *attr;
2802 
2803 		id = nlmsg_data(nlh);
2804 		memset(id, 0, sizeof(*id));
2805 		id->dir = dir;
2806 		if (c->data.byid)
2807 			id->index = xp->index;
2808 		else
2809 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2810 
2811 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2812 		err = -EMSGSIZE;
2813 		if (attr == NULL)
2814 			goto out_free_skb;
2815 
2816 		p = nla_data(attr);
2817 	}
2818 
2819 	copy_to_user_policy(xp, p, dir);
2820 	err = copy_to_user_tmpl(xp, skb);
2821 	if (!err)
2822 		err = copy_to_user_policy_type(xp->type, skb);
2823 	if (!err)
2824 		err = xfrm_mark_put(skb, &xp->mark);
2825 	if (err)
2826 		goto out_free_skb;
2827 
2828 	nlmsg_end(skb, nlh);
2829 
2830 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2831 
2832 out_free_skb:
2833 	kfree_skb(skb);
2834 	return err;
2835 }
2836 
2837 static int xfrm_notify_policy_flush(const struct km_event *c)
2838 {
2839 	struct net *net = c->net;
2840 	struct nlmsghdr *nlh;
2841 	struct sk_buff *skb;
2842 	int err;
2843 
2844 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2845 	if (skb == NULL)
2846 		return -ENOMEM;
2847 
2848 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2849 	err = -EMSGSIZE;
2850 	if (nlh == NULL)
2851 		goto out_free_skb;
2852 	err = copy_to_user_policy_type(c->data.type, skb);
2853 	if (err)
2854 		goto out_free_skb;
2855 
2856 	nlmsg_end(skb, nlh);
2857 
2858 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2859 
2860 out_free_skb:
2861 	kfree_skb(skb);
2862 	return err;
2863 }
2864 
2865 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2866 {
2867 
2868 	switch (c->event) {
2869 	case XFRM_MSG_NEWPOLICY:
2870 	case XFRM_MSG_UPDPOLICY:
2871 	case XFRM_MSG_DELPOLICY:
2872 		return xfrm_notify_policy(xp, dir, c);
2873 	case XFRM_MSG_FLUSHPOLICY:
2874 		return xfrm_notify_policy_flush(c);
2875 	case XFRM_MSG_POLEXPIRE:
2876 		return xfrm_exp_policy_notify(xp, dir, c);
2877 	default:
2878 		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2879 		       c->event);
2880 	}
2881 
2882 	return 0;
2883 
2884 }
2885 
2886 static inline size_t xfrm_report_msgsize(void)
2887 {
2888 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2889 }
2890 
2891 static int build_report(struct sk_buff *skb, u8 proto,
2892 			struct xfrm_selector *sel, xfrm_address_t *addr)
2893 {
2894 	struct xfrm_user_report *ur;
2895 	struct nlmsghdr *nlh;
2896 
2897 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2898 	if (nlh == NULL)
2899 		return -EMSGSIZE;
2900 
2901 	ur = nlmsg_data(nlh);
2902 	ur->proto = proto;
2903 	memcpy(&ur->sel, sel, sizeof(ur->sel));
2904 
2905 	if (addr) {
2906 		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2907 		if (err) {
2908 			nlmsg_cancel(skb, nlh);
2909 			return err;
2910 		}
2911 	}
2912 	return nlmsg_end(skb, nlh);
2913 }
2914 
2915 static int xfrm_send_report(struct net *net, u8 proto,
2916 			    struct xfrm_selector *sel, xfrm_address_t *addr)
2917 {
2918 	struct sk_buff *skb;
2919 
2920 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2921 	if (skb == NULL)
2922 		return -ENOMEM;
2923 
2924 	if (build_report(skb, proto, sel, addr) < 0)
2925 		BUG();
2926 
2927 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
2928 }
2929 
2930 static inline size_t xfrm_mapping_msgsize(void)
2931 {
2932 	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2933 }
2934 
2935 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2936 			 xfrm_address_t *new_saddr, __be16 new_sport)
2937 {
2938 	struct xfrm_user_mapping *um;
2939 	struct nlmsghdr *nlh;
2940 
2941 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2942 	if (nlh == NULL)
2943 		return -EMSGSIZE;
2944 
2945 	um = nlmsg_data(nlh);
2946 
2947 	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2948 	um->id.spi = x->id.spi;
2949 	um->id.family = x->props.family;
2950 	um->id.proto = x->id.proto;
2951 	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2952 	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2953 	um->new_sport = new_sport;
2954 	um->old_sport = x->encap->encap_sport;
2955 	um->reqid = x->props.reqid;
2956 
2957 	return nlmsg_end(skb, nlh);
2958 }
2959 
2960 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2961 			     __be16 sport)
2962 {
2963 	struct net *net = xs_net(x);
2964 	struct sk_buff *skb;
2965 
2966 	if (x->id.proto != IPPROTO_ESP)
2967 		return -EINVAL;
2968 
2969 	if (!x->encap)
2970 		return -EINVAL;
2971 
2972 	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2973 	if (skb == NULL)
2974 		return -ENOMEM;
2975 
2976 	if (build_mapping(skb, x, ipaddr, sport) < 0)
2977 		BUG();
2978 
2979 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
2980 }
2981 
2982 static bool xfrm_is_alive(const struct km_event *c)
2983 {
2984 	return (bool)xfrm_acquire_is_on(c->net);
2985 }
2986 
2987 static struct xfrm_mgr netlink_mgr = {
2988 	.id		= "netlink",
2989 	.notify		= xfrm_send_state_notify,
2990 	.acquire	= xfrm_send_acquire,
2991 	.compile_policy	= xfrm_compile_policy,
2992 	.notify_policy	= xfrm_send_policy_notify,
2993 	.report		= xfrm_send_report,
2994 	.migrate	= xfrm_send_migrate,
2995 	.new_mapping	= xfrm_send_mapping,
2996 	.is_alive	= xfrm_is_alive,
2997 };
2998 
2999 static int __net_init xfrm_user_net_init(struct net *net)
3000 {
3001 	struct sock *nlsk;
3002 	struct netlink_kernel_cfg cfg = {
3003 		.groups	= XFRMNLGRP_MAX,
3004 		.input	= xfrm_netlink_rcv,
3005 	};
3006 
3007 	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3008 	if (nlsk == NULL)
3009 		return -ENOMEM;
3010 	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3011 	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3012 	return 0;
3013 }
3014 
3015 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3016 {
3017 	struct net *net;
3018 	list_for_each_entry(net, net_exit_list, exit_list)
3019 		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3020 	synchronize_net();
3021 	list_for_each_entry(net, net_exit_list, exit_list)
3022 		netlink_kernel_release(net->xfrm.nlsk_stash);
3023 }
3024 
3025 static struct pernet_operations xfrm_user_net_ops = {
3026 	.init	    = xfrm_user_net_init,
3027 	.exit_batch = xfrm_user_net_exit,
3028 };
3029 
3030 static int __init xfrm_user_init(void)
3031 {
3032 	int rv;
3033 
3034 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3035 
3036 	rv = register_pernet_subsys(&xfrm_user_net_ops);
3037 	if (rv < 0)
3038 		return rv;
3039 	rv = xfrm_register_km(&netlink_mgr);
3040 	if (rv < 0)
3041 		unregister_pernet_subsys(&xfrm_user_net_ops);
3042 	return rv;
3043 }
3044 
3045 static void __exit xfrm_user_exit(void)
3046 {
3047 	xfrm_unregister_km(&netlink_mgr);
3048 	unregister_pernet_subsys(&xfrm_user_net_ops);
3049 }
3050 
3051 module_init(xfrm_user_init);
3052 module_exit(xfrm_user_exit);
3053 MODULE_LICENSE("GPL");
3054 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3055 
3056