xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision 83a530e1)
1 /* xfrm_user.c: User interface to configure xfrm engine.
2  *
3  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4  *
5  * Changes:
6  *	Mitsuru KANDA @USAGI
7  * 	Kazunori MIYAZAWA @USAGI
8  * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9  * 		IPv6 support
10  *
11  */
12 
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <linux/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35 
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 {
38 	struct nlattr *rt = attrs[type];
39 	struct xfrm_algo *algp;
40 
41 	if (!rt)
42 		return 0;
43 
44 	algp = nla_data(rt);
45 	if (nla_len(rt) < (int)xfrm_alg_len(algp))
46 		return -EINVAL;
47 
48 	switch (type) {
49 	case XFRMA_ALG_AUTH:
50 	case XFRMA_ALG_CRYPT:
51 	case XFRMA_ALG_COMP:
52 		break;
53 
54 	default:
55 		return -EINVAL;
56 	}
57 
58 	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
59 	return 0;
60 }
61 
62 static int verify_auth_trunc(struct nlattr **attrs)
63 {
64 	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 	struct xfrm_algo_auth *algp;
66 
67 	if (!rt)
68 		return 0;
69 
70 	algp = nla_data(rt);
71 	if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
72 		return -EINVAL;
73 
74 	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
75 	return 0;
76 }
77 
78 static int verify_aead(struct nlattr **attrs)
79 {
80 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 	struct xfrm_algo_aead *algp;
82 
83 	if (!rt)
84 		return 0;
85 
86 	algp = nla_data(rt);
87 	if (nla_len(rt) < (int)aead_len(algp))
88 		return -EINVAL;
89 
90 	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
91 	return 0;
92 }
93 
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 			   xfrm_address_t **addrp)
96 {
97 	struct nlattr *rt = attrs[type];
98 
99 	if (rt && addrp)
100 		*addrp = nla_data(rt);
101 }
102 
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 	struct xfrm_user_sec_ctx *uctx;
107 
108 	if (!rt)
109 		return 0;
110 
111 	uctx = nla_data(rt);
112 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113 		return -EINVAL;
114 
115 	return 0;
116 }
117 
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 				struct nlattr **attrs)
120 {
121 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 	struct xfrm_replay_state_esn *rs;
123 
124 	if (!rt)
125 		return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
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) < (int)xfrm_replay_state_esn_len(rs) &&
133 	    nla_len(rt) != sizeof(*rs))
134 		return -EINVAL;
135 
136 	/* As only ESP and AH support ESN feature. */
137 	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
138 		return -EINVAL;
139 
140 	if (p->replay_window != 0)
141 		return -EINVAL;
142 
143 	return 0;
144 }
145 
146 static int verify_newsa_info(struct xfrm_usersa_info *p,
147 			     struct nlattr **attrs)
148 {
149 	int err;
150 
151 	err = -EINVAL;
152 	switch (p->family) {
153 	case AF_INET:
154 		break;
155 
156 	case AF_INET6:
157 #if IS_ENABLED(CONFIG_IPV6)
158 		break;
159 #else
160 		err = -EAFNOSUPPORT;
161 		goto out;
162 #endif
163 
164 	default:
165 		goto out;
166 	}
167 
168 	err = -EINVAL;
169 	switch (p->id.proto) {
170 	case IPPROTO_AH:
171 		if ((!attrs[XFRMA_ALG_AUTH]	&&
172 		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
173 		    attrs[XFRMA_ALG_AEAD]	||
174 		    attrs[XFRMA_ALG_CRYPT]	||
175 		    attrs[XFRMA_ALG_COMP]	||
176 		    attrs[XFRMA_TFCPAD])
177 			goto out;
178 		break;
179 
180 	case IPPROTO_ESP:
181 		if (attrs[XFRMA_ALG_COMP])
182 			goto out;
183 		if (!attrs[XFRMA_ALG_AUTH] &&
184 		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
185 		    !attrs[XFRMA_ALG_CRYPT] &&
186 		    !attrs[XFRMA_ALG_AEAD])
187 			goto out;
188 		if ((attrs[XFRMA_ALG_AUTH] ||
189 		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
190 		     attrs[XFRMA_ALG_CRYPT]) &&
191 		    attrs[XFRMA_ALG_AEAD])
192 			goto out;
193 		if (attrs[XFRMA_TFCPAD] &&
194 		    p->mode != XFRM_MODE_TUNNEL)
195 			goto out;
196 		break;
197 
198 	case IPPROTO_COMP:
199 		if (!attrs[XFRMA_ALG_COMP]	||
200 		    attrs[XFRMA_ALG_AEAD]	||
201 		    attrs[XFRMA_ALG_AUTH]	||
202 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
203 		    attrs[XFRMA_ALG_CRYPT]	||
204 		    attrs[XFRMA_TFCPAD]		||
205 		    (ntohl(p->id.spi) >= 0x10000))
206 			goto out;
207 		break;
208 
209 #if IS_ENABLED(CONFIG_IPV6)
210 	case IPPROTO_DSTOPTS:
211 	case IPPROTO_ROUTING:
212 		if (attrs[XFRMA_ALG_COMP]	||
213 		    attrs[XFRMA_ALG_AUTH]	||
214 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
215 		    attrs[XFRMA_ALG_AEAD]	||
216 		    attrs[XFRMA_ALG_CRYPT]	||
217 		    attrs[XFRMA_ENCAP]		||
218 		    attrs[XFRMA_SEC_CTX]	||
219 		    attrs[XFRMA_TFCPAD]		||
220 		    !attrs[XFRMA_COADDR])
221 			goto out;
222 		break;
223 #endif
224 
225 	default:
226 		goto out;
227 	}
228 
229 	if ((err = verify_aead(attrs)))
230 		goto out;
231 	if ((err = verify_auth_trunc(attrs)))
232 		goto out;
233 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
234 		goto out;
235 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
236 		goto out;
237 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
238 		goto out;
239 	if ((err = verify_sec_ctx_len(attrs)))
240 		goto out;
241 	if ((err = verify_replay(p, attrs)))
242 		goto out;
243 
244 	err = -EINVAL;
245 	switch (p->mode) {
246 	case XFRM_MODE_TRANSPORT:
247 	case XFRM_MODE_TUNNEL:
248 	case XFRM_MODE_ROUTEOPTIMIZATION:
249 	case XFRM_MODE_BEET:
250 		break;
251 
252 	default:
253 		goto out;
254 	}
255 
256 	err = 0;
257 
258 out:
259 	return err;
260 }
261 
262 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
263 			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
264 			   struct nlattr *rta)
265 {
266 	struct xfrm_algo *p, *ualg;
267 	struct xfrm_algo_desc *algo;
268 
269 	if (!rta)
270 		return 0;
271 
272 	ualg = nla_data(rta);
273 
274 	algo = get_byname(ualg->alg_name, 1);
275 	if (!algo)
276 		return -ENOSYS;
277 	*props = algo->desc.sadb_alg_id;
278 
279 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
280 	if (!p)
281 		return -ENOMEM;
282 
283 	strcpy(p->alg_name, algo->name);
284 	*algpp = p;
285 	return 0;
286 }
287 
288 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
289 {
290 	struct xfrm_algo *p, *ualg;
291 	struct xfrm_algo_desc *algo;
292 
293 	if (!rta)
294 		return 0;
295 
296 	ualg = nla_data(rta);
297 
298 	algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
299 	if (!algo)
300 		return -ENOSYS;
301 	x->props.ealgo = algo->desc.sadb_alg_id;
302 
303 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
304 	if (!p)
305 		return -ENOMEM;
306 
307 	strcpy(p->alg_name, algo->name);
308 	x->ealg = p;
309 	x->geniv = algo->uinfo.encr.geniv;
310 	return 0;
311 }
312 
313 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
314 		       struct nlattr *rta)
315 {
316 	struct xfrm_algo *ualg;
317 	struct xfrm_algo_auth *p;
318 	struct xfrm_algo_desc *algo;
319 
320 	if (!rta)
321 		return 0;
322 
323 	ualg = nla_data(rta);
324 
325 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
326 	if (!algo)
327 		return -ENOSYS;
328 	*props = algo->desc.sadb_alg_id;
329 
330 	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
331 	if (!p)
332 		return -ENOMEM;
333 
334 	strcpy(p->alg_name, algo->name);
335 	p->alg_key_len = ualg->alg_key_len;
336 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
337 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
338 
339 	*algpp = p;
340 	return 0;
341 }
342 
343 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
344 			     struct nlattr *rta)
345 {
346 	struct xfrm_algo_auth *p, *ualg;
347 	struct xfrm_algo_desc *algo;
348 
349 	if (!rta)
350 		return 0;
351 
352 	ualg = nla_data(rta);
353 
354 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
355 	if (!algo)
356 		return -ENOSYS;
357 	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
358 		return -EINVAL;
359 	*props = algo->desc.sadb_alg_id;
360 
361 	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
362 	if (!p)
363 		return -ENOMEM;
364 
365 	strcpy(p->alg_name, algo->name);
366 	if (!p->alg_trunc_len)
367 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
368 
369 	*algpp = p;
370 	return 0;
371 }
372 
373 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
374 {
375 	struct xfrm_algo_aead *p, *ualg;
376 	struct xfrm_algo_desc *algo;
377 
378 	if (!rta)
379 		return 0;
380 
381 	ualg = nla_data(rta);
382 
383 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
384 	if (!algo)
385 		return -ENOSYS;
386 	x->props.ealgo = algo->desc.sadb_alg_id;
387 
388 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
389 	if (!p)
390 		return -ENOMEM;
391 
392 	strcpy(p->alg_name, algo->name);
393 	x->aead = p;
394 	x->geniv = algo->uinfo.aead.geniv;
395 	return 0;
396 }
397 
398 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
399 					 struct nlattr *rp)
400 {
401 	struct xfrm_replay_state_esn *up;
402 	unsigned int ulen;
403 
404 	if (!replay_esn || !rp)
405 		return 0;
406 
407 	up = nla_data(rp);
408 	ulen = xfrm_replay_state_esn_len(up);
409 
410 	/* Check the overall length and the internal bitmap length to avoid
411 	 * potential overflow. */
412 	if (nla_len(rp) < (int)ulen ||
413 	    xfrm_replay_state_esn_len(replay_esn) != ulen ||
414 	    replay_esn->bmp_len != up->bmp_len)
415 		return -EINVAL;
416 
417 	if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
418 		return -EINVAL;
419 
420 	return 0;
421 }
422 
423 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
424 				       struct xfrm_replay_state_esn **preplay_esn,
425 				       struct nlattr *rta)
426 {
427 	struct xfrm_replay_state_esn *p, *pp, *up;
428 	unsigned int klen, ulen;
429 
430 	if (!rta)
431 		return 0;
432 
433 	up = nla_data(rta);
434 	klen = xfrm_replay_state_esn_len(up);
435 	ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
436 
437 	p = kzalloc(klen, GFP_KERNEL);
438 	if (!p)
439 		return -ENOMEM;
440 
441 	pp = kzalloc(klen, GFP_KERNEL);
442 	if (!pp) {
443 		kfree(p);
444 		return -ENOMEM;
445 	}
446 
447 	memcpy(p, up, ulen);
448 	memcpy(pp, up, ulen);
449 
450 	*replay_esn = p;
451 	*preplay_esn = pp;
452 
453 	return 0;
454 }
455 
456 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
457 {
458 	unsigned int len = 0;
459 
460 	if (xfrm_ctx) {
461 		len += sizeof(struct xfrm_user_sec_ctx);
462 		len += xfrm_ctx->ctx_len;
463 	}
464 	return len;
465 }
466 
467 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
468 {
469 	memcpy(&x->id, &p->id, sizeof(x->id));
470 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
471 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
472 	x->props.mode = p->mode;
473 	x->props.replay_window = min_t(unsigned int, p->replay_window,
474 					sizeof(x->replay.bitmap) * 8);
475 	x->props.reqid = p->reqid;
476 	x->props.family = p->family;
477 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
478 	x->props.flags = p->flags;
479 
480 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
481 		x->sel.family = p->family;
482 }
483 
484 /*
485  * someday when pfkey also has support, we could have the code
486  * somehow made shareable and move it to xfrm_state.c - JHS
487  *
488 */
489 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
490 				  int update_esn)
491 {
492 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
493 	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
494 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
495 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
496 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
497 
498 	if (re) {
499 		struct xfrm_replay_state_esn *replay_esn;
500 		replay_esn = nla_data(re);
501 		memcpy(x->replay_esn, replay_esn,
502 		       xfrm_replay_state_esn_len(replay_esn));
503 		memcpy(x->preplay_esn, replay_esn,
504 		       xfrm_replay_state_esn_len(replay_esn));
505 	}
506 
507 	if (rp) {
508 		struct xfrm_replay_state *replay;
509 		replay = nla_data(rp);
510 		memcpy(&x->replay, replay, sizeof(*replay));
511 		memcpy(&x->preplay, replay, sizeof(*replay));
512 	}
513 
514 	if (lt) {
515 		struct xfrm_lifetime_cur *ltime;
516 		ltime = nla_data(lt);
517 		x->curlft.bytes = ltime->bytes;
518 		x->curlft.packets = ltime->packets;
519 		x->curlft.add_time = ltime->add_time;
520 		x->curlft.use_time = ltime->use_time;
521 	}
522 
523 	if (et)
524 		x->replay_maxage = nla_get_u32(et);
525 
526 	if (rt)
527 		x->replay_maxdiff = nla_get_u32(rt);
528 }
529 
530 static struct xfrm_state *xfrm_state_construct(struct net *net,
531 					       struct xfrm_usersa_info *p,
532 					       struct nlattr **attrs,
533 					       int *errp)
534 {
535 	struct xfrm_state *x = xfrm_state_alloc(net);
536 	int err = -ENOMEM;
537 
538 	if (!x)
539 		goto error_no_put;
540 
541 	copy_from_user_state(x, p);
542 
543 	if (attrs[XFRMA_SA_EXTRA_FLAGS])
544 		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
545 
546 	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
547 		goto error;
548 	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
549 				     attrs[XFRMA_ALG_AUTH_TRUNC])))
550 		goto error;
551 	if (!x->props.aalgo) {
552 		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
553 				       attrs[XFRMA_ALG_AUTH])))
554 			goto error;
555 	}
556 	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
557 		goto error;
558 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
559 				   xfrm_calg_get_byname,
560 				   attrs[XFRMA_ALG_COMP])))
561 		goto error;
562 
563 	if (attrs[XFRMA_ENCAP]) {
564 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
565 				   sizeof(*x->encap), GFP_KERNEL);
566 		if (x->encap == NULL)
567 			goto error;
568 	}
569 
570 	if (attrs[XFRMA_TFCPAD])
571 		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
572 
573 	if (attrs[XFRMA_COADDR]) {
574 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
575 				    sizeof(*x->coaddr), GFP_KERNEL);
576 		if (x->coaddr == NULL)
577 			goto error;
578 	}
579 
580 	xfrm_mark_get(attrs, &x->mark);
581 
582 	if (attrs[XFRMA_OUTPUT_MARK])
583 		x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
584 
585 	err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
586 	if (err)
587 		goto error;
588 
589 	if (attrs[XFRMA_SEC_CTX]) {
590 		err = security_xfrm_state_alloc(x,
591 						nla_data(attrs[XFRMA_SEC_CTX]));
592 		if (err)
593 			goto error;
594 	}
595 
596 	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
597 					       attrs[XFRMA_REPLAY_ESN_VAL])))
598 		goto error;
599 
600 	x->km.seq = p->seq;
601 	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
602 	/* sysctl_xfrm_aevent_etime is in 100ms units */
603 	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
604 
605 	if ((err = xfrm_init_replay(x)))
606 		goto error;
607 
608 	/* override default values from above */
609 	xfrm_update_ae_params(x, attrs, 0);
610 
611 	/* configure the hardware if offload is requested */
612 	if (attrs[XFRMA_OFFLOAD_DEV]) {
613 		err = xfrm_dev_state_add(net, x,
614 					 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
615 		if (err)
616 			goto error;
617 	}
618 
619 	return x;
620 
621 error:
622 	x->km.state = XFRM_STATE_DEAD;
623 	xfrm_state_put(x);
624 error_no_put:
625 	*errp = err;
626 	return NULL;
627 }
628 
629 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
630 		struct nlattr **attrs)
631 {
632 	struct net *net = sock_net(skb->sk);
633 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
634 	struct xfrm_state *x;
635 	int err;
636 	struct km_event c;
637 
638 	err = verify_newsa_info(p, attrs);
639 	if (err)
640 		return err;
641 
642 	x = xfrm_state_construct(net, p, attrs, &err);
643 	if (!x)
644 		return err;
645 
646 	xfrm_state_hold(x);
647 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
648 		err = xfrm_state_add(x);
649 	else
650 		err = xfrm_state_update(x);
651 
652 	xfrm_audit_state_add(x, err ? 0 : 1, true);
653 
654 	if (err < 0) {
655 		x->km.state = XFRM_STATE_DEAD;
656 		xfrm_dev_state_delete(x);
657 		__xfrm_state_put(x);
658 		goto out;
659 	}
660 
661 	if (x->km.state == XFRM_STATE_VOID)
662 		x->km.state = XFRM_STATE_VALID;
663 
664 	c.seq = nlh->nlmsg_seq;
665 	c.portid = nlh->nlmsg_pid;
666 	c.event = nlh->nlmsg_type;
667 
668 	km_state_notify(x, &c);
669 out:
670 	xfrm_state_put(x);
671 	return err;
672 }
673 
674 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
675 						 struct xfrm_usersa_id *p,
676 						 struct nlattr **attrs,
677 						 int *errp)
678 {
679 	struct xfrm_state *x = NULL;
680 	struct xfrm_mark m;
681 	int err;
682 	u32 mark = xfrm_mark_get(attrs, &m);
683 
684 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
685 		err = -ESRCH;
686 		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
687 	} else {
688 		xfrm_address_t *saddr = NULL;
689 
690 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
691 		if (!saddr) {
692 			err = -EINVAL;
693 			goto out;
694 		}
695 
696 		err = -ESRCH;
697 		x = xfrm_state_lookup_byaddr(net, mark,
698 					     &p->daddr, saddr,
699 					     p->proto, p->family);
700 	}
701 
702  out:
703 	if (!x && errp)
704 		*errp = err;
705 	return x;
706 }
707 
708 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
709 		struct nlattr **attrs)
710 {
711 	struct net *net = sock_net(skb->sk);
712 	struct xfrm_state *x;
713 	int err = -ESRCH;
714 	struct km_event c;
715 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
716 
717 	x = xfrm_user_state_lookup(net, p, attrs, &err);
718 	if (x == NULL)
719 		return err;
720 
721 	if ((err = security_xfrm_state_delete(x)) != 0)
722 		goto out;
723 
724 	if (xfrm_state_kern(x)) {
725 		err = -EPERM;
726 		goto out;
727 	}
728 
729 	err = xfrm_state_delete(x);
730 
731 	if (err < 0)
732 		goto out;
733 
734 	c.seq = nlh->nlmsg_seq;
735 	c.portid = nlh->nlmsg_pid;
736 	c.event = nlh->nlmsg_type;
737 	km_state_notify(x, &c);
738 
739 out:
740 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
741 	xfrm_state_put(x);
742 	return err;
743 }
744 
745 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
746 {
747 	memset(p, 0, sizeof(*p));
748 	memcpy(&p->id, &x->id, sizeof(p->id));
749 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
750 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
751 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
752 	put_unaligned(x->stats.replay_window, &p->stats.replay_window);
753 	put_unaligned(x->stats.replay, &p->stats.replay);
754 	put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
755 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
756 	p->mode = x->props.mode;
757 	p->replay_window = x->props.replay_window;
758 	p->reqid = x->props.reqid;
759 	p->family = x->props.family;
760 	p->flags = x->props.flags;
761 	p->seq = x->km.seq;
762 }
763 
764 struct xfrm_dump_info {
765 	struct sk_buff *in_skb;
766 	struct sk_buff *out_skb;
767 	u32 nlmsg_seq;
768 	u16 nlmsg_flags;
769 };
770 
771 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
772 {
773 	struct xfrm_user_sec_ctx *uctx;
774 	struct nlattr *attr;
775 	int ctx_size = sizeof(*uctx) + s->ctx_len;
776 
777 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
778 	if (attr == NULL)
779 		return -EMSGSIZE;
780 
781 	uctx = nla_data(attr);
782 	uctx->exttype = XFRMA_SEC_CTX;
783 	uctx->len = ctx_size;
784 	uctx->ctx_doi = s->ctx_doi;
785 	uctx->ctx_alg = s->ctx_alg;
786 	uctx->ctx_len = s->ctx_len;
787 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
788 
789 	return 0;
790 }
791 
792 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
793 {
794 	struct xfrm_user_offload *xuo;
795 	struct nlattr *attr;
796 
797 	attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
798 	if (attr == NULL)
799 		return -EMSGSIZE;
800 
801 	xuo = nla_data(attr);
802 	memset(xuo, 0, sizeof(*xuo));
803 	xuo->ifindex = xso->dev->ifindex;
804 	xuo->flags = xso->flags;
805 
806 	return 0;
807 }
808 
809 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
810 {
811 	struct xfrm_algo *algo;
812 	struct nlattr *nla;
813 
814 	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
815 			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
816 	if (!nla)
817 		return -EMSGSIZE;
818 
819 	algo = nla_data(nla);
820 	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
821 	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
822 	algo->alg_key_len = auth->alg_key_len;
823 
824 	return 0;
825 }
826 
827 /* Don't change this without updating xfrm_sa_len! */
828 static int copy_to_user_state_extra(struct xfrm_state *x,
829 				    struct xfrm_usersa_info *p,
830 				    struct sk_buff *skb)
831 {
832 	int ret = 0;
833 
834 	copy_to_user_state(x, p);
835 
836 	if (x->props.extra_flags) {
837 		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
838 				  x->props.extra_flags);
839 		if (ret)
840 			goto out;
841 	}
842 
843 	if (x->coaddr) {
844 		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
845 		if (ret)
846 			goto out;
847 	}
848 	if (x->lastused) {
849 		ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
850 					XFRMA_PAD);
851 		if (ret)
852 			goto out;
853 	}
854 	if (x->aead) {
855 		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
856 		if (ret)
857 			goto out;
858 	}
859 	if (x->aalg) {
860 		ret = copy_to_user_auth(x->aalg, skb);
861 		if (!ret)
862 			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
863 				      xfrm_alg_auth_len(x->aalg), x->aalg);
864 		if (ret)
865 			goto out;
866 	}
867 	if (x->ealg) {
868 		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
869 		if (ret)
870 			goto out;
871 	}
872 	if (x->calg) {
873 		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
874 		if (ret)
875 			goto out;
876 	}
877 	if (x->encap) {
878 		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
879 		if (ret)
880 			goto out;
881 	}
882 	if (x->tfcpad) {
883 		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
884 		if (ret)
885 			goto out;
886 	}
887 	ret = xfrm_mark_put(skb, &x->mark);
888 	if (ret)
889 		goto out;
890 	if (x->replay_esn)
891 		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
892 			      xfrm_replay_state_esn_len(x->replay_esn),
893 			      x->replay_esn);
894 	else
895 		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
896 			      &x->replay);
897 	if (ret)
898 		goto out;
899 	if(x->xso.dev)
900 		ret = copy_user_offload(&x->xso, skb);
901 	if (ret)
902 		goto out;
903 	if (x->props.output_mark) {
904 		ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
905 		if (ret)
906 			goto out;
907 	}
908 	if (x->security)
909 		ret = copy_sec_ctx(x->security, skb);
910 out:
911 	return ret;
912 }
913 
914 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
915 {
916 	struct xfrm_dump_info *sp = ptr;
917 	struct sk_buff *in_skb = sp->in_skb;
918 	struct sk_buff *skb = sp->out_skb;
919 	struct xfrm_usersa_info *p;
920 	struct nlmsghdr *nlh;
921 	int err;
922 
923 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
924 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
925 	if (nlh == NULL)
926 		return -EMSGSIZE;
927 
928 	p = nlmsg_data(nlh);
929 
930 	err = copy_to_user_state_extra(x, p, skb);
931 	if (err) {
932 		nlmsg_cancel(skb, nlh);
933 		return err;
934 	}
935 	nlmsg_end(skb, nlh);
936 	return 0;
937 }
938 
939 static int xfrm_dump_sa_done(struct netlink_callback *cb)
940 {
941 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
942 	struct sock *sk = cb->skb->sk;
943 	struct net *net = sock_net(sk);
944 
945 	if (cb->args[0])
946 		xfrm_state_walk_done(walk, net);
947 	return 0;
948 }
949 
950 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
951 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
952 {
953 	struct net *net = sock_net(skb->sk);
954 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
955 	struct xfrm_dump_info info;
956 
957 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
958 		     sizeof(cb->args) - sizeof(cb->args[0]));
959 
960 	info.in_skb = cb->skb;
961 	info.out_skb = skb;
962 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
963 	info.nlmsg_flags = NLM_F_MULTI;
964 
965 	if (!cb->args[0]) {
966 		struct nlattr *attrs[XFRMA_MAX+1];
967 		struct xfrm_address_filter *filter = NULL;
968 		u8 proto = 0;
969 		int err;
970 
971 		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
972 				  NULL);
973 		if (err < 0)
974 			return err;
975 
976 		if (attrs[XFRMA_ADDRESS_FILTER]) {
977 			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
978 					 sizeof(*filter), GFP_KERNEL);
979 			if (filter == NULL)
980 				return -ENOMEM;
981 		}
982 
983 		if (attrs[XFRMA_PROTO])
984 			proto = nla_get_u8(attrs[XFRMA_PROTO]);
985 
986 		xfrm_state_walk_init(walk, proto, filter);
987 		cb->args[0] = 1;
988 	}
989 
990 	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
991 
992 	return skb->len;
993 }
994 
995 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
996 					  struct xfrm_state *x, u32 seq)
997 {
998 	struct xfrm_dump_info info;
999 	struct sk_buff *skb;
1000 	int err;
1001 
1002 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1003 	if (!skb)
1004 		return ERR_PTR(-ENOMEM);
1005 
1006 	info.in_skb = in_skb;
1007 	info.out_skb = skb;
1008 	info.nlmsg_seq = seq;
1009 	info.nlmsg_flags = 0;
1010 
1011 	err = dump_one_state(x, 0, &info);
1012 	if (err) {
1013 		kfree_skb(skb);
1014 		return ERR_PTR(err);
1015 	}
1016 
1017 	return skb;
1018 }
1019 
1020 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1021  * Must be called with RCU read lock.
1022  */
1023 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1024 				       u32 pid, unsigned int group)
1025 {
1026 	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1027 
1028 	if (nlsk)
1029 		return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1030 	else
1031 		return -1;
1032 }
1033 
1034 static inline unsigned int xfrm_spdinfo_msgsize(void)
1035 {
1036 	return NLMSG_ALIGN(4)
1037 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
1038 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1039 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1040 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1041 }
1042 
1043 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1044 			 u32 portid, u32 seq, u32 flags)
1045 {
1046 	struct xfrmk_spdinfo si;
1047 	struct xfrmu_spdinfo spc;
1048 	struct xfrmu_spdhinfo sph;
1049 	struct xfrmu_spdhthresh spt4, spt6;
1050 	struct nlmsghdr *nlh;
1051 	int err;
1052 	u32 *f;
1053 	unsigned lseq;
1054 
1055 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1056 	if (nlh == NULL) /* shouldn't really happen ... */
1057 		return -EMSGSIZE;
1058 
1059 	f = nlmsg_data(nlh);
1060 	*f = flags;
1061 	xfrm_spd_getinfo(net, &si);
1062 	spc.incnt = si.incnt;
1063 	spc.outcnt = si.outcnt;
1064 	spc.fwdcnt = si.fwdcnt;
1065 	spc.inscnt = si.inscnt;
1066 	spc.outscnt = si.outscnt;
1067 	spc.fwdscnt = si.fwdscnt;
1068 	sph.spdhcnt = si.spdhcnt;
1069 	sph.spdhmcnt = si.spdhmcnt;
1070 
1071 	do {
1072 		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1073 
1074 		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1075 		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1076 		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1077 		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1078 	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1079 
1080 	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1081 	if (!err)
1082 		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1083 	if (!err)
1084 		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1085 	if (!err)
1086 		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1087 	if (err) {
1088 		nlmsg_cancel(skb, nlh);
1089 		return err;
1090 	}
1091 
1092 	nlmsg_end(skb, nlh);
1093 	return 0;
1094 }
1095 
1096 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1097 			    struct nlattr **attrs)
1098 {
1099 	struct net *net = sock_net(skb->sk);
1100 	struct xfrmu_spdhthresh *thresh4 = NULL;
1101 	struct xfrmu_spdhthresh *thresh6 = NULL;
1102 
1103 	/* selector prefixlen thresholds to hash policies */
1104 	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1105 		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1106 
1107 		if (nla_len(rta) < sizeof(*thresh4))
1108 			return -EINVAL;
1109 		thresh4 = nla_data(rta);
1110 		if (thresh4->lbits > 32 || thresh4->rbits > 32)
1111 			return -EINVAL;
1112 	}
1113 	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1114 		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1115 
1116 		if (nla_len(rta) < sizeof(*thresh6))
1117 			return -EINVAL;
1118 		thresh6 = nla_data(rta);
1119 		if (thresh6->lbits > 128 || thresh6->rbits > 128)
1120 			return -EINVAL;
1121 	}
1122 
1123 	if (thresh4 || thresh6) {
1124 		write_seqlock(&net->xfrm.policy_hthresh.lock);
1125 		if (thresh4) {
1126 			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1127 			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1128 		}
1129 		if (thresh6) {
1130 			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1131 			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1132 		}
1133 		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1134 
1135 		xfrm_policy_hash_rebuild(net);
1136 	}
1137 
1138 	return 0;
1139 }
1140 
1141 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1142 		struct nlattr **attrs)
1143 {
1144 	struct net *net = sock_net(skb->sk);
1145 	struct sk_buff *r_skb;
1146 	u32 *flags = nlmsg_data(nlh);
1147 	u32 sportid = NETLINK_CB(skb).portid;
1148 	u32 seq = nlh->nlmsg_seq;
1149 	int err;
1150 
1151 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1152 	if (r_skb == NULL)
1153 		return -ENOMEM;
1154 
1155 	err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1156 	BUG_ON(err < 0);
1157 
1158 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1159 }
1160 
1161 static inline unsigned int xfrm_sadinfo_msgsize(void)
1162 {
1163 	return NLMSG_ALIGN(4)
1164 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1165 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1166 }
1167 
1168 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1169 			 u32 portid, u32 seq, u32 flags)
1170 {
1171 	struct xfrmk_sadinfo si;
1172 	struct xfrmu_sadhinfo sh;
1173 	struct nlmsghdr *nlh;
1174 	int err;
1175 	u32 *f;
1176 
1177 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1178 	if (nlh == NULL) /* shouldn't really happen ... */
1179 		return -EMSGSIZE;
1180 
1181 	f = nlmsg_data(nlh);
1182 	*f = flags;
1183 	xfrm_sad_getinfo(net, &si);
1184 
1185 	sh.sadhmcnt = si.sadhmcnt;
1186 	sh.sadhcnt = si.sadhcnt;
1187 
1188 	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1189 	if (!err)
1190 		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1191 	if (err) {
1192 		nlmsg_cancel(skb, nlh);
1193 		return err;
1194 	}
1195 
1196 	nlmsg_end(skb, nlh);
1197 	return 0;
1198 }
1199 
1200 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1201 		struct nlattr **attrs)
1202 {
1203 	struct net *net = sock_net(skb->sk);
1204 	struct sk_buff *r_skb;
1205 	u32 *flags = nlmsg_data(nlh);
1206 	u32 sportid = NETLINK_CB(skb).portid;
1207 	u32 seq = nlh->nlmsg_seq;
1208 	int err;
1209 
1210 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1211 	if (r_skb == NULL)
1212 		return -ENOMEM;
1213 
1214 	err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1215 	BUG_ON(err < 0);
1216 
1217 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1218 }
1219 
1220 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1221 		struct nlattr **attrs)
1222 {
1223 	struct net *net = sock_net(skb->sk);
1224 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1225 	struct xfrm_state *x;
1226 	struct sk_buff *resp_skb;
1227 	int err = -ESRCH;
1228 
1229 	x = xfrm_user_state_lookup(net, p, attrs, &err);
1230 	if (x == NULL)
1231 		goto out_noput;
1232 
1233 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1234 	if (IS_ERR(resp_skb)) {
1235 		err = PTR_ERR(resp_skb);
1236 	} else {
1237 		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1238 	}
1239 	xfrm_state_put(x);
1240 out_noput:
1241 	return err;
1242 }
1243 
1244 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1245 		struct nlattr **attrs)
1246 {
1247 	struct net *net = sock_net(skb->sk);
1248 	struct xfrm_state *x;
1249 	struct xfrm_userspi_info *p;
1250 	struct sk_buff *resp_skb;
1251 	xfrm_address_t *daddr;
1252 	int family;
1253 	int err;
1254 	u32 mark;
1255 	struct xfrm_mark m;
1256 
1257 	p = nlmsg_data(nlh);
1258 	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1259 	if (err)
1260 		goto out_noput;
1261 
1262 	family = p->info.family;
1263 	daddr = &p->info.id.daddr;
1264 
1265 	x = NULL;
1266 
1267 	mark = xfrm_mark_get(attrs, &m);
1268 	if (p->info.seq) {
1269 		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1270 		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1271 			xfrm_state_put(x);
1272 			x = NULL;
1273 		}
1274 	}
1275 
1276 	if (!x)
1277 		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1278 				  p->info.id.proto, daddr,
1279 				  &p->info.saddr, 1,
1280 				  family);
1281 	err = -ENOENT;
1282 	if (x == NULL)
1283 		goto out_noput;
1284 
1285 	err = xfrm_alloc_spi(x, p->min, p->max);
1286 	if (err)
1287 		goto out;
1288 
1289 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1290 	if (IS_ERR(resp_skb)) {
1291 		err = PTR_ERR(resp_skb);
1292 		goto out;
1293 	}
1294 
1295 	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1296 
1297 out:
1298 	xfrm_state_put(x);
1299 out_noput:
1300 	return err;
1301 }
1302 
1303 static int verify_policy_dir(u8 dir)
1304 {
1305 	switch (dir) {
1306 	case XFRM_POLICY_IN:
1307 	case XFRM_POLICY_OUT:
1308 	case XFRM_POLICY_FWD:
1309 		break;
1310 
1311 	default:
1312 		return -EINVAL;
1313 	}
1314 
1315 	return 0;
1316 }
1317 
1318 static int verify_policy_type(u8 type)
1319 {
1320 	switch (type) {
1321 	case XFRM_POLICY_TYPE_MAIN:
1322 #ifdef CONFIG_XFRM_SUB_POLICY
1323 	case XFRM_POLICY_TYPE_SUB:
1324 #endif
1325 		break;
1326 
1327 	default:
1328 		return -EINVAL;
1329 	}
1330 
1331 	return 0;
1332 }
1333 
1334 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1335 {
1336 	int ret;
1337 
1338 	switch (p->share) {
1339 	case XFRM_SHARE_ANY:
1340 	case XFRM_SHARE_SESSION:
1341 	case XFRM_SHARE_USER:
1342 	case XFRM_SHARE_UNIQUE:
1343 		break;
1344 
1345 	default:
1346 		return -EINVAL;
1347 	}
1348 
1349 	switch (p->action) {
1350 	case XFRM_POLICY_ALLOW:
1351 	case XFRM_POLICY_BLOCK:
1352 		break;
1353 
1354 	default:
1355 		return -EINVAL;
1356 	}
1357 
1358 	switch (p->sel.family) {
1359 	case AF_INET:
1360 		break;
1361 
1362 	case AF_INET6:
1363 #if IS_ENABLED(CONFIG_IPV6)
1364 		break;
1365 #else
1366 		return  -EAFNOSUPPORT;
1367 #endif
1368 
1369 	default:
1370 		return -EINVAL;
1371 	}
1372 
1373 	ret = verify_policy_dir(p->dir);
1374 	if (ret)
1375 		return ret;
1376 	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1377 		return -EINVAL;
1378 
1379 	return 0;
1380 }
1381 
1382 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1383 {
1384 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1385 	struct xfrm_user_sec_ctx *uctx;
1386 
1387 	if (!rt)
1388 		return 0;
1389 
1390 	uctx = nla_data(rt);
1391 	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1392 }
1393 
1394 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1395 			   int nr)
1396 {
1397 	int i;
1398 
1399 	xp->xfrm_nr = nr;
1400 	for (i = 0; i < nr; i++, ut++) {
1401 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1402 
1403 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1404 		memcpy(&t->saddr, &ut->saddr,
1405 		       sizeof(xfrm_address_t));
1406 		t->reqid = ut->reqid;
1407 		t->mode = ut->mode;
1408 		t->share = ut->share;
1409 		t->optional = ut->optional;
1410 		t->aalgos = ut->aalgos;
1411 		t->ealgos = ut->ealgos;
1412 		t->calgos = ut->calgos;
1413 		/* If all masks are ~0, then we allow all algorithms. */
1414 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1415 		t->encap_family = ut->family;
1416 	}
1417 }
1418 
1419 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1420 {
1421 	u16 prev_family;
1422 	int i;
1423 
1424 	if (nr > XFRM_MAX_DEPTH)
1425 		return -EINVAL;
1426 
1427 	prev_family = family;
1428 
1429 	for (i = 0; i < nr; i++) {
1430 		/* We never validated the ut->family value, so many
1431 		 * applications simply leave it at zero.  The check was
1432 		 * never made and ut->family was ignored because all
1433 		 * templates could be assumed to have the same family as
1434 		 * the policy itself.  Now that we will have ipv4-in-ipv6
1435 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1436 		 */
1437 		if (!ut[i].family)
1438 			ut[i].family = family;
1439 
1440 		if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1441 		    (ut[i].family != prev_family))
1442 			return -EINVAL;
1443 
1444 		prev_family = ut[i].family;
1445 
1446 		switch (ut[i].family) {
1447 		case AF_INET:
1448 			break;
1449 #if IS_ENABLED(CONFIG_IPV6)
1450 		case AF_INET6:
1451 			break;
1452 #endif
1453 		default:
1454 			return -EINVAL;
1455 		}
1456 
1457 		switch (ut[i].id.proto) {
1458 		case IPPROTO_AH:
1459 		case IPPROTO_ESP:
1460 		case IPPROTO_COMP:
1461 #if IS_ENABLED(CONFIG_IPV6)
1462 		case IPPROTO_ROUTING:
1463 		case IPPROTO_DSTOPTS:
1464 #endif
1465 		case IPSEC_PROTO_ANY:
1466 			break;
1467 		default:
1468 			return -EINVAL;
1469 		}
1470 
1471 	}
1472 
1473 	return 0;
1474 }
1475 
1476 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1477 {
1478 	struct nlattr *rt = attrs[XFRMA_TMPL];
1479 
1480 	if (!rt) {
1481 		pol->xfrm_nr = 0;
1482 	} else {
1483 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1484 		int nr = nla_len(rt) / sizeof(*utmpl);
1485 		int err;
1486 
1487 		err = validate_tmpl(nr, utmpl, pol->family);
1488 		if (err)
1489 			return err;
1490 
1491 		copy_templates(pol, utmpl, nr);
1492 	}
1493 	return 0;
1494 }
1495 
1496 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1497 {
1498 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1499 	struct xfrm_userpolicy_type *upt;
1500 	u8 type = XFRM_POLICY_TYPE_MAIN;
1501 	int err;
1502 
1503 	if (rt) {
1504 		upt = nla_data(rt);
1505 		type = upt->type;
1506 	}
1507 
1508 	err = verify_policy_type(type);
1509 	if (err)
1510 		return err;
1511 
1512 	*tp = type;
1513 	return 0;
1514 }
1515 
1516 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1517 {
1518 	xp->priority = p->priority;
1519 	xp->index = p->index;
1520 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1521 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1522 	xp->action = p->action;
1523 	xp->flags = p->flags;
1524 	xp->family = p->sel.family;
1525 	/* XXX xp->share = p->share; */
1526 }
1527 
1528 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1529 {
1530 	memset(p, 0, sizeof(*p));
1531 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1532 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1533 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1534 	p->priority = xp->priority;
1535 	p->index = xp->index;
1536 	p->sel.family = xp->family;
1537 	p->dir = dir;
1538 	p->action = xp->action;
1539 	p->flags = xp->flags;
1540 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1541 }
1542 
1543 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1544 {
1545 	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1546 	int err;
1547 
1548 	if (!xp) {
1549 		*errp = -ENOMEM;
1550 		return NULL;
1551 	}
1552 
1553 	copy_from_user_policy(xp, p);
1554 
1555 	err = copy_from_user_policy_type(&xp->type, attrs);
1556 	if (err)
1557 		goto error;
1558 
1559 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1560 		err = copy_from_user_sec_ctx(xp, attrs);
1561 	if (err)
1562 		goto error;
1563 
1564 	xfrm_mark_get(attrs, &xp->mark);
1565 
1566 	return xp;
1567  error:
1568 	*errp = err;
1569 	xp->walk.dead = 1;
1570 	xfrm_policy_destroy(xp);
1571 	return NULL;
1572 }
1573 
1574 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1575 		struct nlattr **attrs)
1576 {
1577 	struct net *net = sock_net(skb->sk);
1578 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1579 	struct xfrm_policy *xp;
1580 	struct km_event c;
1581 	int err;
1582 	int excl;
1583 
1584 	err = verify_newpolicy_info(p);
1585 	if (err)
1586 		return err;
1587 	err = verify_sec_ctx_len(attrs);
1588 	if (err)
1589 		return err;
1590 
1591 	xp = xfrm_policy_construct(net, p, attrs, &err);
1592 	if (!xp)
1593 		return err;
1594 
1595 	/* shouldn't excl be based on nlh flags??
1596 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1597 	 * in netlink excl is a flag and you wouldnt need
1598 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1599 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1600 	err = xfrm_policy_insert(p->dir, xp, excl);
1601 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1602 
1603 	if (err) {
1604 		security_xfrm_policy_free(xp->security);
1605 		kfree(xp);
1606 		return err;
1607 	}
1608 
1609 	c.event = nlh->nlmsg_type;
1610 	c.seq = nlh->nlmsg_seq;
1611 	c.portid = nlh->nlmsg_pid;
1612 	km_policy_notify(xp, p->dir, &c);
1613 
1614 	xfrm_pol_put(xp);
1615 
1616 	return 0;
1617 }
1618 
1619 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1620 {
1621 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1622 	int i;
1623 
1624 	if (xp->xfrm_nr == 0)
1625 		return 0;
1626 
1627 	for (i = 0; i < xp->xfrm_nr; i++) {
1628 		struct xfrm_user_tmpl *up = &vec[i];
1629 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1630 
1631 		memset(up, 0, sizeof(*up));
1632 		memcpy(&up->id, &kp->id, sizeof(up->id));
1633 		up->family = kp->encap_family;
1634 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1635 		up->reqid = kp->reqid;
1636 		up->mode = kp->mode;
1637 		up->share = kp->share;
1638 		up->optional = kp->optional;
1639 		up->aalgos = kp->aalgos;
1640 		up->ealgos = kp->ealgos;
1641 		up->calgos = kp->calgos;
1642 	}
1643 
1644 	return nla_put(skb, XFRMA_TMPL,
1645 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1646 }
1647 
1648 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1649 {
1650 	if (x->security) {
1651 		return copy_sec_ctx(x->security, skb);
1652 	}
1653 	return 0;
1654 }
1655 
1656 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1657 {
1658 	if (xp->security)
1659 		return copy_sec_ctx(xp->security, skb);
1660 	return 0;
1661 }
1662 static inline unsigned int userpolicy_type_attrsize(void)
1663 {
1664 #ifdef CONFIG_XFRM_SUB_POLICY
1665 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1666 #else
1667 	return 0;
1668 #endif
1669 }
1670 
1671 #ifdef CONFIG_XFRM_SUB_POLICY
1672 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1673 {
1674 	struct xfrm_userpolicy_type upt = {
1675 		.type = type,
1676 	};
1677 
1678 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1679 }
1680 
1681 #else
1682 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1683 {
1684 	return 0;
1685 }
1686 #endif
1687 
1688 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1689 {
1690 	struct xfrm_dump_info *sp = ptr;
1691 	struct xfrm_userpolicy_info *p;
1692 	struct sk_buff *in_skb = sp->in_skb;
1693 	struct sk_buff *skb = sp->out_skb;
1694 	struct nlmsghdr *nlh;
1695 	int err;
1696 
1697 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1698 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1699 	if (nlh == NULL)
1700 		return -EMSGSIZE;
1701 
1702 	p = nlmsg_data(nlh);
1703 	copy_to_user_policy(xp, p, dir);
1704 	err = copy_to_user_tmpl(xp, skb);
1705 	if (!err)
1706 		err = copy_to_user_sec_ctx(xp, skb);
1707 	if (!err)
1708 		err = copy_to_user_policy_type(xp->type, skb);
1709 	if (!err)
1710 		err = xfrm_mark_put(skb, &xp->mark);
1711 	if (err) {
1712 		nlmsg_cancel(skb, nlh);
1713 		return err;
1714 	}
1715 	nlmsg_end(skb, nlh);
1716 	return 0;
1717 }
1718 
1719 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1720 {
1721 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1722 	struct net *net = sock_net(cb->skb->sk);
1723 
1724 	xfrm_policy_walk_done(walk, net);
1725 	return 0;
1726 }
1727 
1728 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1729 {
1730 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1731 
1732 	BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1733 
1734 	xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1735 	return 0;
1736 }
1737 
1738 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1739 {
1740 	struct net *net = sock_net(skb->sk);
1741 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1742 	struct xfrm_dump_info info;
1743 
1744 	info.in_skb = cb->skb;
1745 	info.out_skb = skb;
1746 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1747 	info.nlmsg_flags = NLM_F_MULTI;
1748 
1749 	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1750 
1751 	return skb->len;
1752 }
1753 
1754 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1755 					  struct xfrm_policy *xp,
1756 					  int dir, u32 seq)
1757 {
1758 	struct xfrm_dump_info info;
1759 	struct sk_buff *skb;
1760 	int err;
1761 
1762 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1763 	if (!skb)
1764 		return ERR_PTR(-ENOMEM);
1765 
1766 	info.in_skb = in_skb;
1767 	info.out_skb = skb;
1768 	info.nlmsg_seq = seq;
1769 	info.nlmsg_flags = 0;
1770 
1771 	err = dump_one_policy(xp, dir, 0, &info);
1772 	if (err) {
1773 		kfree_skb(skb);
1774 		return ERR_PTR(err);
1775 	}
1776 
1777 	return skb;
1778 }
1779 
1780 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1781 		struct nlattr **attrs)
1782 {
1783 	struct net *net = sock_net(skb->sk);
1784 	struct xfrm_policy *xp;
1785 	struct xfrm_userpolicy_id *p;
1786 	u8 type = XFRM_POLICY_TYPE_MAIN;
1787 	int err;
1788 	struct km_event c;
1789 	int delete;
1790 	struct xfrm_mark m;
1791 	u32 mark = xfrm_mark_get(attrs, &m);
1792 
1793 	p = nlmsg_data(nlh);
1794 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1795 
1796 	err = copy_from_user_policy_type(&type, attrs);
1797 	if (err)
1798 		return err;
1799 
1800 	err = verify_policy_dir(p->dir);
1801 	if (err)
1802 		return err;
1803 
1804 	if (p->index)
1805 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1806 	else {
1807 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1808 		struct xfrm_sec_ctx *ctx;
1809 
1810 		err = verify_sec_ctx_len(attrs);
1811 		if (err)
1812 			return err;
1813 
1814 		ctx = NULL;
1815 		if (rt) {
1816 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1817 
1818 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1819 			if (err)
1820 				return err;
1821 		}
1822 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1823 					   ctx, delete, &err);
1824 		security_xfrm_policy_free(ctx);
1825 	}
1826 	if (xp == NULL)
1827 		return -ENOENT;
1828 
1829 	if (!delete) {
1830 		struct sk_buff *resp_skb;
1831 
1832 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1833 		if (IS_ERR(resp_skb)) {
1834 			err = PTR_ERR(resp_skb);
1835 		} else {
1836 			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1837 					    NETLINK_CB(skb).portid);
1838 		}
1839 	} else {
1840 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1841 
1842 		if (err != 0)
1843 			goto out;
1844 
1845 		c.data.byid = p->index;
1846 		c.event = nlh->nlmsg_type;
1847 		c.seq = nlh->nlmsg_seq;
1848 		c.portid = nlh->nlmsg_pid;
1849 		km_policy_notify(xp, p->dir, &c);
1850 	}
1851 
1852 out:
1853 	xfrm_pol_put(xp);
1854 	return err;
1855 }
1856 
1857 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1858 		struct nlattr **attrs)
1859 {
1860 	struct net *net = sock_net(skb->sk);
1861 	struct km_event c;
1862 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1863 	int err;
1864 
1865 	err = xfrm_state_flush(net, p->proto, true);
1866 	if (err) {
1867 		if (err == -ESRCH) /* empty table */
1868 			return 0;
1869 		return err;
1870 	}
1871 	c.data.proto = p->proto;
1872 	c.event = nlh->nlmsg_type;
1873 	c.seq = nlh->nlmsg_seq;
1874 	c.portid = nlh->nlmsg_pid;
1875 	c.net = net;
1876 	km_state_notify(NULL, &c);
1877 
1878 	return 0;
1879 }
1880 
1881 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1882 {
1883 	unsigned int replay_size = x->replay_esn ?
1884 			      xfrm_replay_state_esn_len(x->replay_esn) :
1885 			      sizeof(struct xfrm_replay_state);
1886 
1887 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1888 	       + nla_total_size(replay_size)
1889 	       + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1890 	       + nla_total_size(sizeof(struct xfrm_mark))
1891 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1892 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1893 }
1894 
1895 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1896 {
1897 	struct xfrm_aevent_id *id;
1898 	struct nlmsghdr *nlh;
1899 	int err;
1900 
1901 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1902 	if (nlh == NULL)
1903 		return -EMSGSIZE;
1904 
1905 	id = nlmsg_data(nlh);
1906 	memset(&id->sa_id, 0, sizeof(id->sa_id));
1907 	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1908 	id->sa_id.spi = x->id.spi;
1909 	id->sa_id.family = x->props.family;
1910 	id->sa_id.proto = x->id.proto;
1911 	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1912 	id->reqid = x->props.reqid;
1913 	id->flags = c->data.aevent;
1914 
1915 	if (x->replay_esn) {
1916 		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1917 			      xfrm_replay_state_esn_len(x->replay_esn),
1918 			      x->replay_esn);
1919 	} else {
1920 		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1921 			      &x->replay);
1922 	}
1923 	if (err)
1924 		goto out_cancel;
1925 	err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1926 			    XFRMA_PAD);
1927 	if (err)
1928 		goto out_cancel;
1929 
1930 	if (id->flags & XFRM_AE_RTHR) {
1931 		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1932 		if (err)
1933 			goto out_cancel;
1934 	}
1935 	if (id->flags & XFRM_AE_ETHR) {
1936 		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1937 				  x->replay_maxage * 10 / HZ);
1938 		if (err)
1939 			goto out_cancel;
1940 	}
1941 	err = xfrm_mark_put(skb, &x->mark);
1942 	if (err)
1943 		goto out_cancel;
1944 
1945 	nlmsg_end(skb, nlh);
1946 	return 0;
1947 
1948 out_cancel:
1949 	nlmsg_cancel(skb, nlh);
1950 	return err;
1951 }
1952 
1953 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1954 		struct nlattr **attrs)
1955 {
1956 	struct net *net = sock_net(skb->sk);
1957 	struct xfrm_state *x;
1958 	struct sk_buff *r_skb;
1959 	int err;
1960 	struct km_event c;
1961 	u32 mark;
1962 	struct xfrm_mark m;
1963 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1964 	struct xfrm_usersa_id *id = &p->sa_id;
1965 
1966 	mark = xfrm_mark_get(attrs, &m);
1967 
1968 	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1969 	if (x == NULL)
1970 		return -ESRCH;
1971 
1972 	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1973 	if (r_skb == NULL) {
1974 		xfrm_state_put(x);
1975 		return -ENOMEM;
1976 	}
1977 
1978 	/*
1979 	 * XXX: is this lock really needed - none of the other
1980 	 * gets lock (the concern is things getting updated
1981 	 * while we are still reading) - jhs
1982 	*/
1983 	spin_lock_bh(&x->lock);
1984 	c.data.aevent = p->flags;
1985 	c.seq = nlh->nlmsg_seq;
1986 	c.portid = nlh->nlmsg_pid;
1987 
1988 	err = build_aevent(r_skb, x, &c);
1989 	BUG_ON(err < 0);
1990 
1991 	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1992 	spin_unlock_bh(&x->lock);
1993 	xfrm_state_put(x);
1994 	return err;
1995 }
1996 
1997 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1998 		struct nlattr **attrs)
1999 {
2000 	struct net *net = sock_net(skb->sk);
2001 	struct xfrm_state *x;
2002 	struct km_event c;
2003 	int err = -EINVAL;
2004 	u32 mark = 0;
2005 	struct xfrm_mark m;
2006 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
2007 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2008 	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2009 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2010 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2011 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2012 
2013 	if (!lt && !rp && !re && !et && !rt)
2014 		return err;
2015 
2016 	/* pedantic mode - thou shalt sayeth replaceth */
2017 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2018 		return err;
2019 
2020 	mark = xfrm_mark_get(attrs, &m);
2021 
2022 	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2023 	if (x == NULL)
2024 		return -ESRCH;
2025 
2026 	if (x->km.state != XFRM_STATE_VALID)
2027 		goto out;
2028 
2029 	err = xfrm_replay_verify_len(x->replay_esn, re);
2030 	if (err)
2031 		goto out;
2032 
2033 	spin_lock_bh(&x->lock);
2034 	xfrm_update_ae_params(x, attrs, 1);
2035 	spin_unlock_bh(&x->lock);
2036 
2037 	c.event = nlh->nlmsg_type;
2038 	c.seq = nlh->nlmsg_seq;
2039 	c.portid = nlh->nlmsg_pid;
2040 	c.data.aevent = XFRM_AE_CU;
2041 	km_state_notify(x, &c);
2042 	err = 0;
2043 out:
2044 	xfrm_state_put(x);
2045 	return err;
2046 }
2047 
2048 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2049 		struct nlattr **attrs)
2050 {
2051 	struct net *net = sock_net(skb->sk);
2052 	struct km_event c;
2053 	u8 type = XFRM_POLICY_TYPE_MAIN;
2054 	int err;
2055 
2056 	err = copy_from_user_policy_type(&type, attrs);
2057 	if (err)
2058 		return err;
2059 
2060 	err = xfrm_policy_flush(net, type, true);
2061 	if (err) {
2062 		if (err == -ESRCH) /* empty table */
2063 			return 0;
2064 		return err;
2065 	}
2066 
2067 	c.data.type = type;
2068 	c.event = nlh->nlmsg_type;
2069 	c.seq = nlh->nlmsg_seq;
2070 	c.portid = nlh->nlmsg_pid;
2071 	c.net = net;
2072 	km_policy_notify(NULL, 0, &c);
2073 	return 0;
2074 }
2075 
2076 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2077 		struct nlattr **attrs)
2078 {
2079 	struct net *net = sock_net(skb->sk);
2080 	struct xfrm_policy *xp;
2081 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2082 	struct xfrm_userpolicy_info *p = &up->pol;
2083 	u8 type = XFRM_POLICY_TYPE_MAIN;
2084 	int err = -ENOENT;
2085 	struct xfrm_mark m;
2086 	u32 mark = xfrm_mark_get(attrs, &m);
2087 
2088 	err = copy_from_user_policy_type(&type, attrs);
2089 	if (err)
2090 		return err;
2091 
2092 	err = verify_policy_dir(p->dir);
2093 	if (err)
2094 		return err;
2095 
2096 	if (p->index)
2097 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2098 	else {
2099 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2100 		struct xfrm_sec_ctx *ctx;
2101 
2102 		err = verify_sec_ctx_len(attrs);
2103 		if (err)
2104 			return err;
2105 
2106 		ctx = NULL;
2107 		if (rt) {
2108 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2109 
2110 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2111 			if (err)
2112 				return err;
2113 		}
2114 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2115 					   &p->sel, ctx, 0, &err);
2116 		security_xfrm_policy_free(ctx);
2117 	}
2118 	if (xp == NULL)
2119 		return -ENOENT;
2120 
2121 	if (unlikely(xp->walk.dead))
2122 		goto out;
2123 
2124 	err = 0;
2125 	if (up->hard) {
2126 		xfrm_policy_delete(xp, p->dir);
2127 		xfrm_audit_policy_delete(xp, 1, true);
2128 	}
2129 	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2130 
2131 out:
2132 	xfrm_pol_put(xp);
2133 	return err;
2134 }
2135 
2136 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2137 		struct nlattr **attrs)
2138 {
2139 	struct net *net = sock_net(skb->sk);
2140 	struct xfrm_state *x;
2141 	int err;
2142 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2143 	struct xfrm_usersa_info *p = &ue->state;
2144 	struct xfrm_mark m;
2145 	u32 mark = xfrm_mark_get(attrs, &m);
2146 
2147 	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2148 
2149 	err = -ENOENT;
2150 	if (x == NULL)
2151 		return err;
2152 
2153 	spin_lock_bh(&x->lock);
2154 	err = -EINVAL;
2155 	if (x->km.state != XFRM_STATE_VALID)
2156 		goto out;
2157 	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2158 
2159 	if (ue->hard) {
2160 		__xfrm_state_delete(x);
2161 		xfrm_audit_state_delete(x, 1, true);
2162 	}
2163 	err = 0;
2164 out:
2165 	spin_unlock_bh(&x->lock);
2166 	xfrm_state_put(x);
2167 	return err;
2168 }
2169 
2170 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2171 		struct nlattr **attrs)
2172 {
2173 	struct net *net = sock_net(skb->sk);
2174 	struct xfrm_policy *xp;
2175 	struct xfrm_user_tmpl *ut;
2176 	int i;
2177 	struct nlattr *rt = attrs[XFRMA_TMPL];
2178 	struct xfrm_mark mark;
2179 
2180 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2181 	struct xfrm_state *x = xfrm_state_alloc(net);
2182 	int err = -ENOMEM;
2183 
2184 	if (!x)
2185 		goto nomem;
2186 
2187 	xfrm_mark_get(attrs, &mark);
2188 
2189 	err = verify_newpolicy_info(&ua->policy);
2190 	if (err)
2191 		goto free_state;
2192 
2193 	/*   build an XP */
2194 	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2195 	if (!xp)
2196 		goto free_state;
2197 
2198 	memcpy(&x->id, &ua->id, sizeof(ua->id));
2199 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2200 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2201 	xp->mark.m = x->mark.m = mark.m;
2202 	xp->mark.v = x->mark.v = mark.v;
2203 	ut = nla_data(rt);
2204 	/* extract the templates and for each call km_key */
2205 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2206 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2207 		memcpy(&x->id, &t->id, sizeof(x->id));
2208 		x->props.mode = t->mode;
2209 		x->props.reqid = t->reqid;
2210 		x->props.family = ut->family;
2211 		t->aalgos = ua->aalgos;
2212 		t->ealgos = ua->ealgos;
2213 		t->calgos = ua->calgos;
2214 		err = km_query(x, t, xp);
2215 
2216 	}
2217 
2218 	kfree(x);
2219 	kfree(xp);
2220 
2221 	return 0;
2222 
2223 free_state:
2224 	kfree(x);
2225 nomem:
2226 	return err;
2227 }
2228 
2229 #ifdef CONFIG_XFRM_MIGRATE
2230 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2231 				  struct xfrm_kmaddress *k,
2232 				  struct nlattr **attrs, int *num)
2233 {
2234 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2235 	struct xfrm_user_migrate *um;
2236 	int i, num_migrate;
2237 
2238 	if (k != NULL) {
2239 		struct xfrm_user_kmaddress *uk;
2240 
2241 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2242 		memcpy(&k->local, &uk->local, sizeof(k->local));
2243 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2244 		k->family = uk->family;
2245 		k->reserved = uk->reserved;
2246 	}
2247 
2248 	um = nla_data(rt);
2249 	num_migrate = nla_len(rt) / sizeof(*um);
2250 
2251 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2252 		return -EINVAL;
2253 
2254 	for (i = 0; i < num_migrate; i++, um++, ma++) {
2255 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2256 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2257 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2258 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2259 
2260 		ma->proto = um->proto;
2261 		ma->mode = um->mode;
2262 		ma->reqid = um->reqid;
2263 
2264 		ma->old_family = um->old_family;
2265 		ma->new_family = um->new_family;
2266 	}
2267 
2268 	*num = i;
2269 	return 0;
2270 }
2271 
2272 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2273 			   struct nlattr **attrs)
2274 {
2275 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2276 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2277 	struct xfrm_kmaddress km, *kmp;
2278 	u8 type;
2279 	int err;
2280 	int n = 0;
2281 	struct net *net = sock_net(skb->sk);
2282 	struct xfrm_encap_tmpl  *encap = NULL;
2283 
2284 	if (attrs[XFRMA_MIGRATE] == NULL)
2285 		return -EINVAL;
2286 
2287 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2288 
2289 	err = copy_from_user_policy_type(&type, attrs);
2290 	if (err)
2291 		return err;
2292 
2293 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2294 	if (err)
2295 		return err;
2296 
2297 	if (!n)
2298 		return 0;
2299 
2300 	if (attrs[XFRMA_ENCAP]) {
2301 		encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2302 				sizeof(*encap), GFP_KERNEL);
2303 		if (!encap)
2304 			return 0;
2305 	}
2306 
2307 	err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2308 
2309 	kfree(encap);
2310 
2311 	return err;
2312 }
2313 #else
2314 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2315 			   struct nlattr **attrs)
2316 {
2317 	return -ENOPROTOOPT;
2318 }
2319 #endif
2320 
2321 #ifdef CONFIG_XFRM_MIGRATE
2322 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2323 {
2324 	struct xfrm_user_migrate um;
2325 
2326 	memset(&um, 0, sizeof(um));
2327 	um.proto = m->proto;
2328 	um.mode = m->mode;
2329 	um.reqid = m->reqid;
2330 	um.old_family = m->old_family;
2331 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2332 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2333 	um.new_family = m->new_family;
2334 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2335 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2336 
2337 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2338 }
2339 
2340 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2341 {
2342 	struct xfrm_user_kmaddress uk;
2343 
2344 	memset(&uk, 0, sizeof(uk));
2345 	uk.family = k->family;
2346 	uk.reserved = k->reserved;
2347 	memcpy(&uk.local, &k->local, sizeof(uk.local));
2348 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2349 
2350 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2351 }
2352 
2353 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2354 						int with_encp)
2355 {
2356 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2357 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2358 	      + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2359 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2360 	      + userpolicy_type_attrsize();
2361 }
2362 
2363 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2364 			 int num_migrate, const struct xfrm_kmaddress *k,
2365 			 const struct xfrm_selector *sel,
2366 			 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2367 {
2368 	const struct xfrm_migrate *mp;
2369 	struct xfrm_userpolicy_id *pol_id;
2370 	struct nlmsghdr *nlh;
2371 	int i, err;
2372 
2373 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2374 	if (nlh == NULL)
2375 		return -EMSGSIZE;
2376 
2377 	pol_id = nlmsg_data(nlh);
2378 	/* copy data from selector, dir, and type to the pol_id */
2379 	memset(pol_id, 0, sizeof(*pol_id));
2380 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2381 	pol_id->dir = dir;
2382 
2383 	if (k != NULL) {
2384 		err = copy_to_user_kmaddress(k, skb);
2385 		if (err)
2386 			goto out_cancel;
2387 	}
2388 	if (encap) {
2389 		err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2390 		if (err)
2391 			goto out_cancel;
2392 	}
2393 	err = copy_to_user_policy_type(type, skb);
2394 	if (err)
2395 		goto out_cancel;
2396 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2397 		err = copy_to_user_migrate(mp, skb);
2398 		if (err)
2399 			goto out_cancel;
2400 	}
2401 
2402 	nlmsg_end(skb, nlh);
2403 	return 0;
2404 
2405 out_cancel:
2406 	nlmsg_cancel(skb, nlh);
2407 	return err;
2408 }
2409 
2410 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2411 			     const struct xfrm_migrate *m, int num_migrate,
2412 			     const struct xfrm_kmaddress *k,
2413 			     const struct xfrm_encap_tmpl *encap)
2414 {
2415 	struct net *net = &init_net;
2416 	struct sk_buff *skb;
2417 	int err;
2418 
2419 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2420 			GFP_ATOMIC);
2421 	if (skb == NULL)
2422 		return -ENOMEM;
2423 
2424 	/* build migrate */
2425 	err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2426 	BUG_ON(err < 0);
2427 
2428 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2429 }
2430 #else
2431 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2432 			     const struct xfrm_migrate *m, int num_migrate,
2433 			     const struct xfrm_kmaddress *k,
2434 			     const struct xfrm_encap_tmpl *encap)
2435 {
2436 	return -ENOPROTOOPT;
2437 }
2438 #endif
2439 
2440 #define XMSGSIZE(type) sizeof(struct type)
2441 
2442 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2443 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2444 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2445 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2446 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2447 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2448 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2449 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2450 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2451 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2452 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2453 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2454 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2455 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2456 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2457 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2458 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2459 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2460 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2461 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2462 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2463 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2464 };
2465 
2466 #undef XMSGSIZE
2467 
2468 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2469 	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2470 	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2471 	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2472 	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2473 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2474 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2475 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2476 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2477 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2478 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2479 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2480 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2481 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2482 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2483 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2484 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2485 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2486 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2487 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2488 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2489 	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2490 	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2491 	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2492 	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2493 	[XFRMA_PROTO]		= { .type = NLA_U8 },
2494 	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2495 	[XFRMA_OFFLOAD_DEV]	= { .len = sizeof(struct xfrm_user_offload) },
2496 	[XFRMA_OUTPUT_MARK]	= { .type = NLA_U32 },
2497 };
2498 
2499 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2500 	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2501 	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2502 };
2503 
2504 static const struct xfrm_link {
2505 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2506 	int (*start)(struct netlink_callback *);
2507 	int (*dump)(struct sk_buff *, struct netlink_callback *);
2508 	int (*done)(struct netlink_callback *);
2509 	const struct nla_policy *nla_pol;
2510 	int nla_max;
2511 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2512 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2513 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2514 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2515 						   .dump = xfrm_dump_sa,
2516 						   .done = xfrm_dump_sa_done  },
2517 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2518 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2519 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2520 						   .start = xfrm_dump_policy_start,
2521 						   .dump = xfrm_dump_policy,
2522 						   .done = xfrm_dump_policy_done },
2523 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2524 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2525 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2526 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2527 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2528 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2529 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2530 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2531 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2532 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2533 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2534 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2535 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2536 						   .nla_pol = xfrma_spd_policy,
2537 						   .nla_max = XFRMA_SPD_MAX },
2538 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2539 };
2540 
2541 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2542 			     struct netlink_ext_ack *extack)
2543 {
2544 	struct net *net = sock_net(skb->sk);
2545 	struct nlattr *attrs[XFRMA_MAX+1];
2546 	const struct xfrm_link *link;
2547 	int type, err;
2548 
2549 #ifdef CONFIG_COMPAT
2550 	if (in_compat_syscall())
2551 		return -EOPNOTSUPP;
2552 #endif
2553 
2554 	type = nlh->nlmsg_type;
2555 	if (type > XFRM_MSG_MAX)
2556 		return -EINVAL;
2557 
2558 	type -= XFRM_MSG_BASE;
2559 	link = &xfrm_dispatch[type];
2560 
2561 	/* All operations require privileges, even GET */
2562 	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2563 		return -EPERM;
2564 
2565 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2566 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2567 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2568 		if (link->dump == NULL)
2569 			return -EINVAL;
2570 
2571 		{
2572 			struct netlink_dump_control c = {
2573 				.start = link->start,
2574 				.dump = link->dump,
2575 				.done = link->done,
2576 			};
2577 			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2578 		}
2579 	}
2580 
2581 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2582 			  link->nla_max ? : XFRMA_MAX,
2583 			  link->nla_pol ? : xfrma_policy, extack);
2584 	if (err < 0)
2585 		return err;
2586 
2587 	if (link->doit == NULL)
2588 		return -EINVAL;
2589 
2590 	return link->doit(skb, nlh, attrs);
2591 }
2592 
2593 static void xfrm_netlink_rcv(struct sk_buff *skb)
2594 {
2595 	struct net *net = sock_net(skb->sk);
2596 
2597 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2598 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2599 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2600 }
2601 
2602 static inline unsigned int xfrm_expire_msgsize(void)
2603 {
2604 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2605 	       + nla_total_size(sizeof(struct xfrm_mark));
2606 }
2607 
2608 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2609 {
2610 	struct xfrm_user_expire *ue;
2611 	struct nlmsghdr *nlh;
2612 	int err;
2613 
2614 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2615 	if (nlh == NULL)
2616 		return -EMSGSIZE;
2617 
2618 	ue = nlmsg_data(nlh);
2619 	copy_to_user_state(x, &ue->state);
2620 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2621 	/* clear the padding bytes */
2622 	memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2623 
2624 	err = xfrm_mark_put(skb, &x->mark);
2625 	if (err)
2626 		return err;
2627 
2628 	nlmsg_end(skb, nlh);
2629 	return 0;
2630 }
2631 
2632 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2633 {
2634 	struct net *net = xs_net(x);
2635 	struct sk_buff *skb;
2636 
2637 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2638 	if (skb == NULL)
2639 		return -ENOMEM;
2640 
2641 	if (build_expire(skb, x, c) < 0) {
2642 		kfree_skb(skb);
2643 		return -EMSGSIZE;
2644 	}
2645 
2646 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2647 }
2648 
2649 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2650 {
2651 	struct net *net = xs_net(x);
2652 	struct sk_buff *skb;
2653 	int err;
2654 
2655 	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2656 	if (skb == NULL)
2657 		return -ENOMEM;
2658 
2659 	err = build_aevent(skb, x, c);
2660 	BUG_ON(err < 0);
2661 
2662 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2663 }
2664 
2665 static int xfrm_notify_sa_flush(const struct km_event *c)
2666 {
2667 	struct net *net = c->net;
2668 	struct xfrm_usersa_flush *p;
2669 	struct nlmsghdr *nlh;
2670 	struct sk_buff *skb;
2671 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2672 
2673 	skb = nlmsg_new(len, GFP_ATOMIC);
2674 	if (skb == NULL)
2675 		return -ENOMEM;
2676 
2677 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2678 	if (nlh == NULL) {
2679 		kfree_skb(skb);
2680 		return -EMSGSIZE;
2681 	}
2682 
2683 	p = nlmsg_data(nlh);
2684 	p->proto = c->data.proto;
2685 
2686 	nlmsg_end(skb, nlh);
2687 
2688 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2689 }
2690 
2691 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2692 {
2693 	unsigned int l = 0;
2694 	if (x->aead)
2695 		l += nla_total_size(aead_len(x->aead));
2696 	if (x->aalg) {
2697 		l += nla_total_size(sizeof(struct xfrm_algo) +
2698 				    (x->aalg->alg_key_len + 7) / 8);
2699 		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2700 	}
2701 	if (x->ealg)
2702 		l += nla_total_size(xfrm_alg_len(x->ealg));
2703 	if (x->calg)
2704 		l += nla_total_size(sizeof(*x->calg));
2705 	if (x->encap)
2706 		l += nla_total_size(sizeof(*x->encap));
2707 	if (x->tfcpad)
2708 		l += nla_total_size(sizeof(x->tfcpad));
2709 	if (x->replay_esn)
2710 		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2711 	else
2712 		l += nla_total_size(sizeof(struct xfrm_replay_state));
2713 	if (x->security)
2714 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2715 				    x->security->ctx_len);
2716 	if (x->coaddr)
2717 		l += nla_total_size(sizeof(*x->coaddr));
2718 	if (x->props.extra_flags)
2719 		l += nla_total_size(sizeof(x->props.extra_flags));
2720 	if (x->xso.dev)
2721 		 l += nla_total_size(sizeof(x->xso));
2722 	if (x->props.output_mark)
2723 		l += nla_total_size(sizeof(x->props.output_mark));
2724 
2725 	/* Must count x->lastused as it may become non-zero behind our back. */
2726 	l += nla_total_size_64bit(sizeof(u64));
2727 
2728 	return l;
2729 }
2730 
2731 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2732 {
2733 	struct net *net = xs_net(x);
2734 	struct xfrm_usersa_info *p;
2735 	struct xfrm_usersa_id *id;
2736 	struct nlmsghdr *nlh;
2737 	struct sk_buff *skb;
2738 	unsigned int len = xfrm_sa_len(x);
2739 	unsigned int headlen;
2740 	int err;
2741 
2742 	headlen = sizeof(*p);
2743 	if (c->event == XFRM_MSG_DELSA) {
2744 		len += nla_total_size(headlen);
2745 		headlen = sizeof(*id);
2746 		len += nla_total_size(sizeof(struct xfrm_mark));
2747 	}
2748 	len += NLMSG_ALIGN(headlen);
2749 
2750 	skb = nlmsg_new(len, GFP_ATOMIC);
2751 	if (skb == NULL)
2752 		return -ENOMEM;
2753 
2754 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2755 	err = -EMSGSIZE;
2756 	if (nlh == NULL)
2757 		goto out_free_skb;
2758 
2759 	p = nlmsg_data(nlh);
2760 	if (c->event == XFRM_MSG_DELSA) {
2761 		struct nlattr *attr;
2762 
2763 		id = nlmsg_data(nlh);
2764 		memset(id, 0, sizeof(*id));
2765 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2766 		id->spi = x->id.spi;
2767 		id->family = x->props.family;
2768 		id->proto = x->id.proto;
2769 
2770 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2771 		err = -EMSGSIZE;
2772 		if (attr == NULL)
2773 			goto out_free_skb;
2774 
2775 		p = nla_data(attr);
2776 	}
2777 	err = copy_to_user_state_extra(x, p, skb);
2778 	if (err)
2779 		goto out_free_skb;
2780 
2781 	nlmsg_end(skb, nlh);
2782 
2783 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2784 
2785 out_free_skb:
2786 	kfree_skb(skb);
2787 	return err;
2788 }
2789 
2790 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2791 {
2792 
2793 	switch (c->event) {
2794 	case XFRM_MSG_EXPIRE:
2795 		return xfrm_exp_state_notify(x, c);
2796 	case XFRM_MSG_NEWAE:
2797 		return xfrm_aevent_state_notify(x, c);
2798 	case XFRM_MSG_DELSA:
2799 	case XFRM_MSG_UPDSA:
2800 	case XFRM_MSG_NEWSA:
2801 		return xfrm_notify_sa(x, c);
2802 	case XFRM_MSG_FLUSHSA:
2803 		return xfrm_notify_sa_flush(c);
2804 	default:
2805 		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2806 		       c->event);
2807 		break;
2808 	}
2809 
2810 	return 0;
2811 
2812 }
2813 
2814 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2815 						struct xfrm_policy *xp)
2816 {
2817 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2818 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2819 	       + nla_total_size(sizeof(struct xfrm_mark))
2820 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2821 	       + userpolicy_type_attrsize();
2822 }
2823 
2824 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2825 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2826 {
2827 	__u32 seq = xfrm_get_acqseq();
2828 	struct xfrm_user_acquire *ua;
2829 	struct nlmsghdr *nlh;
2830 	int err;
2831 
2832 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2833 	if (nlh == NULL)
2834 		return -EMSGSIZE;
2835 
2836 	ua = nlmsg_data(nlh);
2837 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2838 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2839 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2840 	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2841 	ua->aalgos = xt->aalgos;
2842 	ua->ealgos = xt->ealgos;
2843 	ua->calgos = xt->calgos;
2844 	ua->seq = x->km.seq = seq;
2845 
2846 	err = copy_to_user_tmpl(xp, skb);
2847 	if (!err)
2848 		err = copy_to_user_state_sec_ctx(x, skb);
2849 	if (!err)
2850 		err = copy_to_user_policy_type(xp->type, skb);
2851 	if (!err)
2852 		err = xfrm_mark_put(skb, &xp->mark);
2853 	if (err) {
2854 		nlmsg_cancel(skb, nlh);
2855 		return err;
2856 	}
2857 
2858 	nlmsg_end(skb, nlh);
2859 	return 0;
2860 }
2861 
2862 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2863 			     struct xfrm_policy *xp)
2864 {
2865 	struct net *net = xs_net(x);
2866 	struct sk_buff *skb;
2867 	int err;
2868 
2869 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2870 	if (skb == NULL)
2871 		return -ENOMEM;
2872 
2873 	err = build_acquire(skb, x, xt, xp);
2874 	BUG_ON(err < 0);
2875 
2876 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2877 }
2878 
2879 /* User gives us xfrm_user_policy_info followed by an array of 0
2880  * or more templates.
2881  */
2882 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2883 					       u8 *data, int len, int *dir)
2884 {
2885 	struct net *net = sock_net(sk);
2886 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2887 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2888 	struct xfrm_policy *xp;
2889 	int nr;
2890 
2891 	switch (sk->sk_family) {
2892 	case AF_INET:
2893 		if (opt != IP_XFRM_POLICY) {
2894 			*dir = -EOPNOTSUPP;
2895 			return NULL;
2896 		}
2897 		break;
2898 #if IS_ENABLED(CONFIG_IPV6)
2899 	case AF_INET6:
2900 		if (opt != IPV6_XFRM_POLICY) {
2901 			*dir = -EOPNOTSUPP;
2902 			return NULL;
2903 		}
2904 		break;
2905 #endif
2906 	default:
2907 		*dir = -EINVAL;
2908 		return NULL;
2909 	}
2910 
2911 	*dir = -EINVAL;
2912 
2913 	if (len < sizeof(*p) ||
2914 	    verify_newpolicy_info(p))
2915 		return NULL;
2916 
2917 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2918 	if (validate_tmpl(nr, ut, p->sel.family))
2919 		return NULL;
2920 
2921 	if (p->dir > XFRM_POLICY_OUT)
2922 		return NULL;
2923 
2924 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2925 	if (xp == NULL) {
2926 		*dir = -ENOBUFS;
2927 		return NULL;
2928 	}
2929 
2930 	copy_from_user_policy(xp, p);
2931 	xp->type = XFRM_POLICY_TYPE_MAIN;
2932 	copy_templates(xp, ut, nr);
2933 
2934 	*dir = p->dir;
2935 
2936 	return xp;
2937 }
2938 
2939 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2940 {
2941 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2942 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2943 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2944 	       + nla_total_size(sizeof(struct xfrm_mark))
2945 	       + userpolicy_type_attrsize();
2946 }
2947 
2948 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2949 			   int dir, const struct km_event *c)
2950 {
2951 	struct xfrm_user_polexpire *upe;
2952 	int hard = c->data.hard;
2953 	struct nlmsghdr *nlh;
2954 	int err;
2955 
2956 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2957 	if (nlh == NULL)
2958 		return -EMSGSIZE;
2959 
2960 	upe = nlmsg_data(nlh);
2961 	copy_to_user_policy(xp, &upe->pol, dir);
2962 	err = copy_to_user_tmpl(xp, skb);
2963 	if (!err)
2964 		err = copy_to_user_sec_ctx(xp, skb);
2965 	if (!err)
2966 		err = copy_to_user_policy_type(xp->type, skb);
2967 	if (!err)
2968 		err = xfrm_mark_put(skb, &xp->mark);
2969 	if (err) {
2970 		nlmsg_cancel(skb, nlh);
2971 		return err;
2972 	}
2973 	upe->hard = !!hard;
2974 
2975 	nlmsg_end(skb, nlh);
2976 	return 0;
2977 }
2978 
2979 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 {
2981 	struct net *net = xp_net(xp);
2982 	struct sk_buff *skb;
2983 	int err;
2984 
2985 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2986 	if (skb == NULL)
2987 		return -ENOMEM;
2988 
2989 	err = build_polexpire(skb, xp, dir, c);
2990 	BUG_ON(err < 0);
2991 
2992 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2993 }
2994 
2995 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2996 {
2997 	unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2998 	struct net *net = xp_net(xp);
2999 	struct xfrm_userpolicy_info *p;
3000 	struct xfrm_userpolicy_id *id;
3001 	struct nlmsghdr *nlh;
3002 	struct sk_buff *skb;
3003 	unsigned int headlen;
3004 	int err;
3005 
3006 	headlen = sizeof(*p);
3007 	if (c->event == XFRM_MSG_DELPOLICY) {
3008 		len += nla_total_size(headlen);
3009 		headlen = sizeof(*id);
3010 	}
3011 	len += userpolicy_type_attrsize();
3012 	len += nla_total_size(sizeof(struct xfrm_mark));
3013 	len += NLMSG_ALIGN(headlen);
3014 
3015 	skb = nlmsg_new(len, GFP_ATOMIC);
3016 	if (skb == NULL)
3017 		return -ENOMEM;
3018 
3019 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3020 	err = -EMSGSIZE;
3021 	if (nlh == NULL)
3022 		goto out_free_skb;
3023 
3024 	p = nlmsg_data(nlh);
3025 	if (c->event == XFRM_MSG_DELPOLICY) {
3026 		struct nlattr *attr;
3027 
3028 		id = nlmsg_data(nlh);
3029 		memset(id, 0, sizeof(*id));
3030 		id->dir = dir;
3031 		if (c->data.byid)
3032 			id->index = xp->index;
3033 		else
3034 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3035 
3036 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3037 		err = -EMSGSIZE;
3038 		if (attr == NULL)
3039 			goto out_free_skb;
3040 
3041 		p = nla_data(attr);
3042 	}
3043 
3044 	copy_to_user_policy(xp, p, dir);
3045 	err = copy_to_user_tmpl(xp, skb);
3046 	if (!err)
3047 		err = copy_to_user_policy_type(xp->type, skb);
3048 	if (!err)
3049 		err = xfrm_mark_put(skb, &xp->mark);
3050 	if (err)
3051 		goto out_free_skb;
3052 
3053 	nlmsg_end(skb, nlh);
3054 
3055 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3056 
3057 out_free_skb:
3058 	kfree_skb(skb);
3059 	return err;
3060 }
3061 
3062 static int xfrm_notify_policy_flush(const struct km_event *c)
3063 {
3064 	struct net *net = c->net;
3065 	struct nlmsghdr *nlh;
3066 	struct sk_buff *skb;
3067 	int err;
3068 
3069 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3070 	if (skb == NULL)
3071 		return -ENOMEM;
3072 
3073 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3074 	err = -EMSGSIZE;
3075 	if (nlh == NULL)
3076 		goto out_free_skb;
3077 	err = copy_to_user_policy_type(c->data.type, skb);
3078 	if (err)
3079 		goto out_free_skb;
3080 
3081 	nlmsg_end(skb, nlh);
3082 
3083 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3084 
3085 out_free_skb:
3086 	kfree_skb(skb);
3087 	return err;
3088 }
3089 
3090 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3091 {
3092 
3093 	switch (c->event) {
3094 	case XFRM_MSG_NEWPOLICY:
3095 	case XFRM_MSG_UPDPOLICY:
3096 	case XFRM_MSG_DELPOLICY:
3097 		return xfrm_notify_policy(xp, dir, c);
3098 	case XFRM_MSG_FLUSHPOLICY:
3099 		return xfrm_notify_policy_flush(c);
3100 	case XFRM_MSG_POLEXPIRE:
3101 		return xfrm_exp_policy_notify(xp, dir, c);
3102 	default:
3103 		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3104 		       c->event);
3105 	}
3106 
3107 	return 0;
3108 
3109 }
3110 
3111 static inline unsigned int xfrm_report_msgsize(void)
3112 {
3113 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3114 }
3115 
3116 static int build_report(struct sk_buff *skb, u8 proto,
3117 			struct xfrm_selector *sel, xfrm_address_t *addr)
3118 {
3119 	struct xfrm_user_report *ur;
3120 	struct nlmsghdr *nlh;
3121 
3122 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3123 	if (nlh == NULL)
3124 		return -EMSGSIZE;
3125 
3126 	ur = nlmsg_data(nlh);
3127 	ur->proto = proto;
3128 	memcpy(&ur->sel, sel, sizeof(ur->sel));
3129 
3130 	if (addr) {
3131 		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3132 		if (err) {
3133 			nlmsg_cancel(skb, nlh);
3134 			return err;
3135 		}
3136 	}
3137 	nlmsg_end(skb, nlh);
3138 	return 0;
3139 }
3140 
3141 static int xfrm_send_report(struct net *net, u8 proto,
3142 			    struct xfrm_selector *sel, xfrm_address_t *addr)
3143 {
3144 	struct sk_buff *skb;
3145 	int err;
3146 
3147 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3148 	if (skb == NULL)
3149 		return -ENOMEM;
3150 
3151 	err = build_report(skb, proto, sel, addr);
3152 	BUG_ON(err < 0);
3153 
3154 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3155 }
3156 
3157 static inline unsigned int xfrm_mapping_msgsize(void)
3158 {
3159 	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3160 }
3161 
3162 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3163 			 xfrm_address_t *new_saddr, __be16 new_sport)
3164 {
3165 	struct xfrm_user_mapping *um;
3166 	struct nlmsghdr *nlh;
3167 
3168 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3169 	if (nlh == NULL)
3170 		return -EMSGSIZE;
3171 
3172 	um = nlmsg_data(nlh);
3173 
3174 	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3175 	um->id.spi = x->id.spi;
3176 	um->id.family = x->props.family;
3177 	um->id.proto = x->id.proto;
3178 	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3179 	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3180 	um->new_sport = new_sport;
3181 	um->old_sport = x->encap->encap_sport;
3182 	um->reqid = x->props.reqid;
3183 
3184 	nlmsg_end(skb, nlh);
3185 	return 0;
3186 }
3187 
3188 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3189 			     __be16 sport)
3190 {
3191 	struct net *net = xs_net(x);
3192 	struct sk_buff *skb;
3193 	int err;
3194 
3195 	if (x->id.proto != IPPROTO_ESP)
3196 		return -EINVAL;
3197 
3198 	if (!x->encap)
3199 		return -EINVAL;
3200 
3201 	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3202 	if (skb == NULL)
3203 		return -ENOMEM;
3204 
3205 	err = build_mapping(skb, x, ipaddr, sport);
3206 	BUG_ON(err < 0);
3207 
3208 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3209 }
3210 
3211 static bool xfrm_is_alive(const struct km_event *c)
3212 {
3213 	return (bool)xfrm_acquire_is_on(c->net);
3214 }
3215 
3216 static struct xfrm_mgr netlink_mgr = {
3217 	.notify		= xfrm_send_state_notify,
3218 	.acquire	= xfrm_send_acquire,
3219 	.compile_policy	= xfrm_compile_policy,
3220 	.notify_policy	= xfrm_send_policy_notify,
3221 	.report		= xfrm_send_report,
3222 	.migrate	= xfrm_send_migrate,
3223 	.new_mapping	= xfrm_send_mapping,
3224 	.is_alive	= xfrm_is_alive,
3225 };
3226 
3227 static int __net_init xfrm_user_net_init(struct net *net)
3228 {
3229 	struct sock *nlsk;
3230 	struct netlink_kernel_cfg cfg = {
3231 		.groups	= XFRMNLGRP_MAX,
3232 		.input	= xfrm_netlink_rcv,
3233 	};
3234 
3235 	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3236 	if (nlsk == NULL)
3237 		return -ENOMEM;
3238 	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3239 	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3240 	return 0;
3241 }
3242 
3243 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3244 {
3245 	struct net *net;
3246 	list_for_each_entry(net, net_exit_list, exit_list)
3247 		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3248 	synchronize_net();
3249 	list_for_each_entry(net, net_exit_list, exit_list)
3250 		netlink_kernel_release(net->xfrm.nlsk_stash);
3251 }
3252 
3253 static struct pernet_operations xfrm_user_net_ops = {
3254 	.init	    = xfrm_user_net_init,
3255 	.exit_batch = xfrm_user_net_exit,
3256 };
3257 
3258 static int __init xfrm_user_init(void)
3259 {
3260 	int rv;
3261 
3262 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3263 
3264 	rv = register_pernet_subsys(&xfrm_user_net_ops);
3265 	if (rv < 0)
3266 		return rv;
3267 	rv = xfrm_register_km(&netlink_mgr);
3268 	if (rv < 0)
3269 		unregister_pernet_subsys(&xfrm_user_net_ops);
3270 	return rv;
3271 }
3272 
3273 static void __exit xfrm_user_exit(void)
3274 {
3275 	xfrm_unregister_km(&netlink_mgr);
3276 	unregister_pernet_subsys(&xfrm_user_net_ops);
3277 }
3278 
3279 module_init(xfrm_user_init);
3280 module_exit(xfrm_user_exit);
3281 MODULE_LICENSE("GPL");
3282 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3283 
3284