xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision 8b235f2f)
1 /* xfrm_user.c: User interface to configure xfrm engine.
2  *
3  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4  *
5  * Changes:
6  *	Mitsuru KANDA @USAGI
7  * 	Kazunori MIYAZAWA @USAGI
8  * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9  * 		IPv6 support
10  *
11  */
12 
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 
35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
36 {
37 	struct nlattr *rt = attrs[type];
38 	struct xfrm_algo *algp;
39 
40 	if (!rt)
41 		return 0;
42 
43 	algp = nla_data(rt);
44 	if (nla_len(rt) < xfrm_alg_len(algp))
45 		return -EINVAL;
46 
47 	switch (type) {
48 	case XFRMA_ALG_AUTH:
49 	case XFRMA_ALG_CRYPT:
50 	case XFRMA_ALG_COMP:
51 		break;
52 
53 	default:
54 		return -EINVAL;
55 	}
56 
57 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 	return 0;
59 }
60 
61 static int verify_auth_trunc(struct nlattr **attrs)
62 {
63 	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 	struct xfrm_algo_auth *algp;
65 
66 	if (!rt)
67 		return 0;
68 
69 	algp = nla_data(rt);
70 	if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 		return -EINVAL;
72 
73 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 	return 0;
75 }
76 
77 static int verify_aead(struct nlattr **attrs)
78 {
79 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 	struct xfrm_algo_aead *algp;
81 
82 	if (!rt)
83 		return 0;
84 
85 	algp = nla_data(rt);
86 	if (nla_len(rt) < aead_len(algp))
87 		return -EINVAL;
88 
89 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 	return 0;
91 }
92 
93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 			   xfrm_address_t **addrp)
95 {
96 	struct nlattr *rt = attrs[type];
97 
98 	if (rt && addrp)
99 		*addrp = nla_data(rt);
100 }
101 
102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
103 {
104 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 	struct xfrm_user_sec_ctx *uctx;
106 
107 	if (!rt)
108 		return 0;
109 
110 	uctx = nla_data(rt);
111 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112 		return -EINVAL;
113 
114 	return 0;
115 }
116 
117 static inline int verify_replay(struct xfrm_usersa_info *p,
118 				struct nlattr **attrs)
119 {
120 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 	struct xfrm_replay_state_esn *rs;
122 
123 	if (p->flags & XFRM_STATE_ESN) {
124 		if (!rt)
125 			return -EINVAL;
126 
127 		rs = nla_data(rt);
128 
129 		if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 			return -EINVAL;
131 
132 		if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 		    nla_len(rt) != sizeof(*rs))
134 			return -EINVAL;
135 	}
136 
137 	if (!rt)
138 		return 0;
139 
140 	/* As only ESP and AH support ESN feature. */
141 	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142 		return -EINVAL;
143 
144 	if (p->replay_window != 0)
145 		return -EINVAL;
146 
147 	return 0;
148 }
149 
150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151 			     struct nlattr **attrs)
152 {
153 	int err;
154 
155 	err = -EINVAL;
156 	switch (p->family) {
157 	case AF_INET:
158 		break;
159 
160 	case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162 		break;
163 #else
164 		err = -EAFNOSUPPORT;
165 		goto out;
166 #endif
167 
168 	default:
169 		goto out;
170 	}
171 
172 	err = -EINVAL;
173 	switch (p->id.proto) {
174 	case IPPROTO_AH:
175 		if ((!attrs[XFRMA_ALG_AUTH]	&&
176 		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 		    attrs[XFRMA_ALG_AEAD]	||
178 		    attrs[XFRMA_ALG_CRYPT]	||
179 		    attrs[XFRMA_ALG_COMP]	||
180 		    attrs[XFRMA_TFCPAD])
181 			goto out;
182 		break;
183 
184 	case IPPROTO_ESP:
185 		if (attrs[XFRMA_ALG_COMP])
186 			goto out;
187 		if (!attrs[XFRMA_ALG_AUTH] &&
188 		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189 		    !attrs[XFRMA_ALG_CRYPT] &&
190 		    !attrs[XFRMA_ALG_AEAD])
191 			goto out;
192 		if ((attrs[XFRMA_ALG_AUTH] ||
193 		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
194 		     attrs[XFRMA_ALG_CRYPT]) &&
195 		    attrs[XFRMA_ALG_AEAD])
196 			goto out;
197 		if (attrs[XFRMA_TFCPAD] &&
198 		    p->mode != XFRM_MODE_TUNNEL)
199 			goto out;
200 		break;
201 
202 	case IPPROTO_COMP:
203 		if (!attrs[XFRMA_ALG_COMP]	||
204 		    attrs[XFRMA_ALG_AEAD]	||
205 		    attrs[XFRMA_ALG_AUTH]	||
206 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
207 		    attrs[XFRMA_ALG_CRYPT]	||
208 		    attrs[XFRMA_TFCPAD]		||
209 		    (ntohl(p->id.spi) >= 0x10000))
210 			goto out;
211 		break;
212 
213 #if IS_ENABLED(CONFIG_IPV6)
214 	case IPPROTO_DSTOPTS:
215 	case IPPROTO_ROUTING:
216 		if (attrs[XFRMA_ALG_COMP]	||
217 		    attrs[XFRMA_ALG_AUTH]	||
218 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
219 		    attrs[XFRMA_ALG_AEAD]	||
220 		    attrs[XFRMA_ALG_CRYPT]	||
221 		    attrs[XFRMA_ENCAP]		||
222 		    attrs[XFRMA_SEC_CTX]	||
223 		    attrs[XFRMA_TFCPAD]		||
224 		    !attrs[XFRMA_COADDR])
225 			goto out;
226 		break;
227 #endif
228 
229 	default:
230 		goto out;
231 	}
232 
233 	if ((err = verify_aead(attrs)))
234 		goto out;
235 	if ((err = verify_auth_trunc(attrs)))
236 		goto out;
237 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
238 		goto out;
239 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
240 		goto out;
241 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
242 		goto out;
243 	if ((err = verify_sec_ctx_len(attrs)))
244 		goto out;
245 	if ((err = verify_replay(p, attrs)))
246 		goto out;
247 
248 	err = -EINVAL;
249 	switch (p->mode) {
250 	case XFRM_MODE_TRANSPORT:
251 	case XFRM_MODE_TUNNEL:
252 	case XFRM_MODE_ROUTEOPTIMIZATION:
253 	case XFRM_MODE_BEET:
254 		break;
255 
256 	default:
257 		goto out;
258 	}
259 
260 	err = 0;
261 
262 out:
263 	return err;
264 }
265 
266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267 			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
268 			   struct nlattr *rta)
269 {
270 	struct xfrm_algo *p, *ualg;
271 	struct xfrm_algo_desc *algo;
272 
273 	if (!rta)
274 		return 0;
275 
276 	ualg = nla_data(rta);
277 
278 	algo = get_byname(ualg->alg_name, 1);
279 	if (!algo)
280 		return -ENOSYS;
281 	*props = algo->desc.sadb_alg_id;
282 
283 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
284 	if (!p)
285 		return -ENOMEM;
286 
287 	strcpy(p->alg_name, algo->name);
288 	*algpp = p;
289 	return 0;
290 }
291 
292 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
293 {
294 	struct xfrm_algo *p, *ualg;
295 	struct xfrm_algo_desc *algo;
296 
297 	if (!rta)
298 		return 0;
299 
300 	ualg = nla_data(rta);
301 
302 	algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
303 	if (!algo)
304 		return -ENOSYS;
305 	x->props.ealgo = algo->desc.sadb_alg_id;
306 
307 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
308 	if (!p)
309 		return -ENOMEM;
310 
311 	strcpy(p->alg_name, algo->name);
312 	x->ealg = p;
313 	x->geniv = algo->uinfo.encr.geniv;
314 	return 0;
315 }
316 
317 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
318 		       struct nlattr *rta)
319 {
320 	struct xfrm_algo *ualg;
321 	struct xfrm_algo_auth *p;
322 	struct xfrm_algo_desc *algo;
323 
324 	if (!rta)
325 		return 0;
326 
327 	ualg = nla_data(rta);
328 
329 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
330 	if (!algo)
331 		return -ENOSYS;
332 	*props = algo->desc.sadb_alg_id;
333 
334 	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
335 	if (!p)
336 		return -ENOMEM;
337 
338 	strcpy(p->alg_name, algo->name);
339 	p->alg_key_len = ualg->alg_key_len;
340 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
341 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
342 
343 	*algpp = p;
344 	return 0;
345 }
346 
347 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
348 			     struct nlattr *rta)
349 {
350 	struct xfrm_algo_auth *p, *ualg;
351 	struct xfrm_algo_desc *algo;
352 
353 	if (!rta)
354 		return 0;
355 
356 	ualg = nla_data(rta);
357 
358 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
359 	if (!algo)
360 		return -ENOSYS;
361 	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
362 		return -EINVAL;
363 	*props = algo->desc.sadb_alg_id;
364 
365 	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
366 	if (!p)
367 		return -ENOMEM;
368 
369 	strcpy(p->alg_name, algo->name);
370 	if (!p->alg_trunc_len)
371 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
372 
373 	*algpp = p;
374 	return 0;
375 }
376 
377 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
378 {
379 	struct xfrm_algo_aead *p, *ualg;
380 	struct xfrm_algo_desc *algo;
381 
382 	if (!rta)
383 		return 0;
384 
385 	ualg = nla_data(rta);
386 
387 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
388 	if (!algo)
389 		return -ENOSYS;
390 	x->props.ealgo = algo->desc.sadb_alg_id;
391 
392 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
393 	if (!p)
394 		return -ENOMEM;
395 
396 	strcpy(p->alg_name, algo->name);
397 	x->aead = p;
398 	x->geniv = algo->uinfo.aead.geniv;
399 	return 0;
400 }
401 
402 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
403 					 struct nlattr *rp)
404 {
405 	struct xfrm_replay_state_esn *up;
406 	int ulen;
407 
408 	if (!replay_esn || !rp)
409 		return 0;
410 
411 	up = nla_data(rp);
412 	ulen = xfrm_replay_state_esn_len(up);
413 
414 	if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
415 		return -EINVAL;
416 
417 	return 0;
418 }
419 
420 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
421 				       struct xfrm_replay_state_esn **preplay_esn,
422 				       struct nlattr *rta)
423 {
424 	struct xfrm_replay_state_esn *p, *pp, *up;
425 	int klen, ulen;
426 
427 	if (!rta)
428 		return 0;
429 
430 	up = nla_data(rta);
431 	klen = xfrm_replay_state_esn_len(up);
432 	ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
433 
434 	p = kzalloc(klen, GFP_KERNEL);
435 	if (!p)
436 		return -ENOMEM;
437 
438 	pp = kzalloc(klen, GFP_KERNEL);
439 	if (!pp) {
440 		kfree(p);
441 		return -ENOMEM;
442 	}
443 
444 	memcpy(p, up, ulen);
445 	memcpy(pp, up, ulen);
446 
447 	*replay_esn = p;
448 	*preplay_esn = pp;
449 
450 	return 0;
451 }
452 
453 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
454 {
455 	int len = 0;
456 
457 	if (xfrm_ctx) {
458 		len += sizeof(struct xfrm_user_sec_ctx);
459 		len += xfrm_ctx->ctx_len;
460 	}
461 	return len;
462 }
463 
464 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
465 {
466 	memcpy(&x->id, &p->id, sizeof(x->id));
467 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
468 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
469 	x->props.mode = p->mode;
470 	x->props.replay_window = min_t(unsigned int, p->replay_window,
471 					sizeof(x->replay.bitmap) * 8);
472 	x->props.reqid = p->reqid;
473 	x->props.family = p->family;
474 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
475 	x->props.flags = p->flags;
476 
477 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
478 		x->sel.family = p->family;
479 }
480 
481 /*
482  * someday when pfkey also has support, we could have the code
483  * somehow made shareable and move it to xfrm_state.c - JHS
484  *
485 */
486 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
487 				  int update_esn)
488 {
489 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
490 	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
491 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
492 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
493 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
494 
495 	if (re) {
496 		struct xfrm_replay_state_esn *replay_esn;
497 		replay_esn = nla_data(re);
498 		memcpy(x->replay_esn, replay_esn,
499 		       xfrm_replay_state_esn_len(replay_esn));
500 		memcpy(x->preplay_esn, replay_esn,
501 		       xfrm_replay_state_esn_len(replay_esn));
502 	}
503 
504 	if (rp) {
505 		struct xfrm_replay_state *replay;
506 		replay = nla_data(rp);
507 		memcpy(&x->replay, replay, sizeof(*replay));
508 		memcpy(&x->preplay, replay, sizeof(*replay));
509 	}
510 
511 	if (lt) {
512 		struct xfrm_lifetime_cur *ltime;
513 		ltime = nla_data(lt);
514 		x->curlft.bytes = ltime->bytes;
515 		x->curlft.packets = ltime->packets;
516 		x->curlft.add_time = ltime->add_time;
517 		x->curlft.use_time = ltime->use_time;
518 	}
519 
520 	if (et)
521 		x->replay_maxage = nla_get_u32(et);
522 
523 	if (rt)
524 		x->replay_maxdiff = nla_get_u32(rt);
525 }
526 
527 static struct xfrm_state *xfrm_state_construct(struct net *net,
528 					       struct xfrm_usersa_info *p,
529 					       struct nlattr **attrs,
530 					       int *errp)
531 {
532 	struct xfrm_state *x = xfrm_state_alloc(net);
533 	int err = -ENOMEM;
534 
535 	if (!x)
536 		goto error_no_put;
537 
538 	copy_from_user_state(x, p);
539 
540 	if (attrs[XFRMA_SA_EXTRA_FLAGS])
541 		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
542 
543 	if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
544 		goto error;
545 	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
546 				     attrs[XFRMA_ALG_AUTH_TRUNC])))
547 		goto error;
548 	if (!x->props.aalgo) {
549 		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
550 				       attrs[XFRMA_ALG_AUTH])))
551 			goto error;
552 	}
553 	if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
554 		goto error;
555 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
556 				   xfrm_calg_get_byname,
557 				   attrs[XFRMA_ALG_COMP])))
558 		goto error;
559 
560 	if (attrs[XFRMA_ENCAP]) {
561 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
562 				   sizeof(*x->encap), GFP_KERNEL);
563 		if (x->encap == NULL)
564 			goto error;
565 	}
566 
567 	if (attrs[XFRMA_TFCPAD])
568 		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
569 
570 	if (attrs[XFRMA_COADDR]) {
571 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
572 				    sizeof(*x->coaddr), GFP_KERNEL);
573 		if (x->coaddr == NULL)
574 			goto error;
575 	}
576 
577 	xfrm_mark_get(attrs, &x->mark);
578 
579 	err = __xfrm_init_state(x, false);
580 	if (err)
581 		goto error;
582 
583 	if (attrs[XFRMA_SEC_CTX] &&
584 	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
585 		goto error;
586 
587 	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
588 					       attrs[XFRMA_REPLAY_ESN_VAL])))
589 		goto error;
590 
591 	x->km.seq = p->seq;
592 	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
593 	/* sysctl_xfrm_aevent_etime is in 100ms units */
594 	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
595 
596 	if ((err = xfrm_init_replay(x)))
597 		goto error;
598 
599 	/* override default values from above */
600 	xfrm_update_ae_params(x, attrs, 0);
601 
602 	return x;
603 
604 error:
605 	x->km.state = XFRM_STATE_DEAD;
606 	xfrm_state_put(x);
607 error_no_put:
608 	*errp = err;
609 	return NULL;
610 }
611 
612 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
613 		struct nlattr **attrs)
614 {
615 	struct net *net = sock_net(skb->sk);
616 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
617 	struct xfrm_state *x;
618 	int err;
619 	struct km_event c;
620 
621 	err = verify_newsa_info(p, attrs);
622 	if (err)
623 		return err;
624 
625 	x = xfrm_state_construct(net, p, attrs, &err);
626 	if (!x)
627 		return err;
628 
629 	xfrm_state_hold(x);
630 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
631 		err = xfrm_state_add(x);
632 	else
633 		err = xfrm_state_update(x);
634 
635 	xfrm_audit_state_add(x, err ? 0 : 1, true);
636 
637 	if (err < 0) {
638 		x->km.state = XFRM_STATE_DEAD;
639 		__xfrm_state_put(x);
640 		goto out;
641 	}
642 
643 	c.seq = nlh->nlmsg_seq;
644 	c.portid = nlh->nlmsg_pid;
645 	c.event = nlh->nlmsg_type;
646 
647 	km_state_notify(x, &c);
648 out:
649 	xfrm_state_put(x);
650 	return err;
651 }
652 
653 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
654 						 struct xfrm_usersa_id *p,
655 						 struct nlattr **attrs,
656 						 int *errp)
657 {
658 	struct xfrm_state *x = NULL;
659 	struct xfrm_mark m;
660 	int err;
661 	u32 mark = xfrm_mark_get(attrs, &m);
662 
663 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
664 		err = -ESRCH;
665 		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
666 	} else {
667 		xfrm_address_t *saddr = NULL;
668 
669 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
670 		if (!saddr) {
671 			err = -EINVAL;
672 			goto out;
673 		}
674 
675 		err = -ESRCH;
676 		x = xfrm_state_lookup_byaddr(net, mark,
677 					     &p->daddr, saddr,
678 					     p->proto, p->family);
679 	}
680 
681  out:
682 	if (!x && errp)
683 		*errp = err;
684 	return x;
685 }
686 
687 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
688 		struct nlattr **attrs)
689 {
690 	struct net *net = sock_net(skb->sk);
691 	struct xfrm_state *x;
692 	int err = -ESRCH;
693 	struct km_event c;
694 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
695 
696 	x = xfrm_user_state_lookup(net, p, attrs, &err);
697 	if (x == NULL)
698 		return err;
699 
700 	if ((err = security_xfrm_state_delete(x)) != 0)
701 		goto out;
702 
703 	if (xfrm_state_kern(x)) {
704 		err = -EPERM;
705 		goto out;
706 	}
707 
708 	err = xfrm_state_delete(x);
709 
710 	if (err < 0)
711 		goto out;
712 
713 	c.seq = nlh->nlmsg_seq;
714 	c.portid = nlh->nlmsg_pid;
715 	c.event = nlh->nlmsg_type;
716 	km_state_notify(x, &c);
717 
718 out:
719 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
720 	xfrm_state_put(x);
721 	return err;
722 }
723 
724 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
725 {
726 	memset(p, 0, sizeof(*p));
727 	memcpy(&p->id, &x->id, sizeof(p->id));
728 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
729 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
730 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
731 	memcpy(&p->stats, &x->stats, sizeof(p->stats));
732 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
733 	p->mode = x->props.mode;
734 	p->replay_window = x->props.replay_window;
735 	p->reqid = x->props.reqid;
736 	p->family = x->props.family;
737 	p->flags = x->props.flags;
738 	p->seq = x->km.seq;
739 }
740 
741 struct xfrm_dump_info {
742 	struct sk_buff *in_skb;
743 	struct sk_buff *out_skb;
744 	u32 nlmsg_seq;
745 	u16 nlmsg_flags;
746 };
747 
748 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
749 {
750 	struct xfrm_user_sec_ctx *uctx;
751 	struct nlattr *attr;
752 	int ctx_size = sizeof(*uctx) + s->ctx_len;
753 
754 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
755 	if (attr == NULL)
756 		return -EMSGSIZE;
757 
758 	uctx = nla_data(attr);
759 	uctx->exttype = XFRMA_SEC_CTX;
760 	uctx->len = ctx_size;
761 	uctx->ctx_doi = s->ctx_doi;
762 	uctx->ctx_alg = s->ctx_alg;
763 	uctx->ctx_len = s->ctx_len;
764 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
765 
766 	return 0;
767 }
768 
769 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
770 {
771 	struct xfrm_algo *algo;
772 	struct nlattr *nla;
773 
774 	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
775 			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
776 	if (!nla)
777 		return -EMSGSIZE;
778 
779 	algo = nla_data(nla);
780 	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
781 	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
782 	algo->alg_key_len = auth->alg_key_len;
783 
784 	return 0;
785 }
786 
787 /* Don't change this without updating xfrm_sa_len! */
788 static int copy_to_user_state_extra(struct xfrm_state *x,
789 				    struct xfrm_usersa_info *p,
790 				    struct sk_buff *skb)
791 {
792 	int ret = 0;
793 
794 	copy_to_user_state(x, p);
795 
796 	if (x->props.extra_flags) {
797 		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
798 				  x->props.extra_flags);
799 		if (ret)
800 			goto out;
801 	}
802 
803 	if (x->coaddr) {
804 		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
805 		if (ret)
806 			goto out;
807 	}
808 	if (x->lastused) {
809 		ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
810 		if (ret)
811 			goto out;
812 	}
813 	if (x->aead) {
814 		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
815 		if (ret)
816 			goto out;
817 	}
818 	if (x->aalg) {
819 		ret = copy_to_user_auth(x->aalg, skb);
820 		if (!ret)
821 			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
822 				      xfrm_alg_auth_len(x->aalg), x->aalg);
823 		if (ret)
824 			goto out;
825 	}
826 	if (x->ealg) {
827 		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
828 		if (ret)
829 			goto out;
830 	}
831 	if (x->calg) {
832 		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
833 		if (ret)
834 			goto out;
835 	}
836 	if (x->encap) {
837 		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
838 		if (ret)
839 			goto out;
840 	}
841 	if (x->tfcpad) {
842 		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
843 		if (ret)
844 			goto out;
845 	}
846 	ret = xfrm_mark_put(skb, &x->mark);
847 	if (ret)
848 		goto out;
849 	if (x->replay_esn)
850 		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
851 			      xfrm_replay_state_esn_len(x->replay_esn),
852 			      x->replay_esn);
853 	else
854 		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
855 			      &x->replay);
856 	if (ret)
857 		goto out;
858 	if (x->security)
859 		ret = copy_sec_ctx(x->security, skb);
860 out:
861 	return ret;
862 }
863 
864 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
865 {
866 	struct xfrm_dump_info *sp = ptr;
867 	struct sk_buff *in_skb = sp->in_skb;
868 	struct sk_buff *skb = sp->out_skb;
869 	struct xfrm_usersa_info *p;
870 	struct nlmsghdr *nlh;
871 	int err;
872 
873 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
874 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
875 	if (nlh == NULL)
876 		return -EMSGSIZE;
877 
878 	p = nlmsg_data(nlh);
879 
880 	err = copy_to_user_state_extra(x, p, skb);
881 	if (err) {
882 		nlmsg_cancel(skb, nlh);
883 		return err;
884 	}
885 	nlmsg_end(skb, nlh);
886 	return 0;
887 }
888 
889 static int xfrm_dump_sa_done(struct netlink_callback *cb)
890 {
891 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
892 	struct sock *sk = cb->skb->sk;
893 	struct net *net = sock_net(sk);
894 
895 	xfrm_state_walk_done(walk, net);
896 	return 0;
897 }
898 
899 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
900 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
901 {
902 	struct net *net = sock_net(skb->sk);
903 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
904 	struct xfrm_dump_info info;
905 
906 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
907 		     sizeof(cb->args) - sizeof(cb->args[0]));
908 
909 	info.in_skb = cb->skb;
910 	info.out_skb = skb;
911 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
912 	info.nlmsg_flags = NLM_F_MULTI;
913 
914 	if (!cb->args[0]) {
915 		struct nlattr *attrs[XFRMA_MAX+1];
916 		struct xfrm_address_filter *filter = NULL;
917 		u8 proto = 0;
918 		int err;
919 
920 		cb->args[0] = 1;
921 
922 		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
923 				  xfrma_policy);
924 		if (err < 0)
925 			return err;
926 
927 		if (attrs[XFRMA_ADDRESS_FILTER]) {
928 			filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
929 					 sizeof(*filter), GFP_KERNEL);
930 			if (filter == NULL)
931 				return -ENOMEM;
932 		}
933 
934 		if (attrs[XFRMA_PROTO])
935 			proto = nla_get_u8(attrs[XFRMA_PROTO]);
936 
937 		xfrm_state_walk_init(walk, proto, filter);
938 	}
939 
940 	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
941 
942 	return skb->len;
943 }
944 
945 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
946 					  struct xfrm_state *x, u32 seq)
947 {
948 	struct xfrm_dump_info info;
949 	struct sk_buff *skb;
950 	int err;
951 
952 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
953 	if (!skb)
954 		return ERR_PTR(-ENOMEM);
955 
956 	info.in_skb = in_skb;
957 	info.out_skb = skb;
958 	info.nlmsg_seq = seq;
959 	info.nlmsg_flags = 0;
960 
961 	err = dump_one_state(x, 0, &info);
962 	if (err) {
963 		kfree_skb(skb);
964 		return ERR_PTR(err);
965 	}
966 
967 	return skb;
968 }
969 
970 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
971  * Must be called with RCU read lock.
972  */
973 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
974 				       u32 pid, unsigned int group)
975 {
976 	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
977 
978 	if (nlsk)
979 		return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
980 	else
981 		return -1;
982 }
983 
984 static inline size_t xfrm_spdinfo_msgsize(void)
985 {
986 	return NLMSG_ALIGN(4)
987 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
988 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
989 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
990 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
991 }
992 
993 static int build_spdinfo(struct sk_buff *skb, struct net *net,
994 			 u32 portid, u32 seq, u32 flags)
995 {
996 	struct xfrmk_spdinfo si;
997 	struct xfrmu_spdinfo spc;
998 	struct xfrmu_spdhinfo sph;
999 	struct xfrmu_spdhthresh spt4, spt6;
1000 	struct nlmsghdr *nlh;
1001 	int err;
1002 	u32 *f;
1003 	unsigned lseq;
1004 
1005 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1006 	if (nlh == NULL) /* shouldn't really happen ... */
1007 		return -EMSGSIZE;
1008 
1009 	f = nlmsg_data(nlh);
1010 	*f = flags;
1011 	xfrm_spd_getinfo(net, &si);
1012 	spc.incnt = si.incnt;
1013 	spc.outcnt = si.outcnt;
1014 	spc.fwdcnt = si.fwdcnt;
1015 	spc.inscnt = si.inscnt;
1016 	spc.outscnt = si.outscnt;
1017 	spc.fwdscnt = si.fwdscnt;
1018 	sph.spdhcnt = si.spdhcnt;
1019 	sph.spdhmcnt = si.spdhmcnt;
1020 
1021 	do {
1022 		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1023 
1024 		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1025 		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1026 		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1027 		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1028 	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1029 
1030 	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1031 	if (!err)
1032 		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1033 	if (!err)
1034 		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1035 	if (!err)
1036 		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1037 	if (err) {
1038 		nlmsg_cancel(skb, nlh);
1039 		return err;
1040 	}
1041 
1042 	nlmsg_end(skb, nlh);
1043 	return 0;
1044 }
1045 
1046 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1047 			    struct nlattr **attrs)
1048 {
1049 	struct net *net = sock_net(skb->sk);
1050 	struct xfrmu_spdhthresh *thresh4 = NULL;
1051 	struct xfrmu_spdhthresh *thresh6 = NULL;
1052 
1053 	/* selector prefixlen thresholds to hash policies */
1054 	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1055 		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1056 
1057 		if (nla_len(rta) < sizeof(*thresh4))
1058 			return -EINVAL;
1059 		thresh4 = nla_data(rta);
1060 		if (thresh4->lbits > 32 || thresh4->rbits > 32)
1061 			return -EINVAL;
1062 	}
1063 	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1064 		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1065 
1066 		if (nla_len(rta) < sizeof(*thresh6))
1067 			return -EINVAL;
1068 		thresh6 = nla_data(rta);
1069 		if (thresh6->lbits > 128 || thresh6->rbits > 128)
1070 			return -EINVAL;
1071 	}
1072 
1073 	if (thresh4 || thresh6) {
1074 		write_seqlock(&net->xfrm.policy_hthresh.lock);
1075 		if (thresh4) {
1076 			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1077 			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1078 		}
1079 		if (thresh6) {
1080 			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1081 			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1082 		}
1083 		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1084 
1085 		xfrm_policy_hash_rebuild(net);
1086 	}
1087 
1088 	return 0;
1089 }
1090 
1091 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1092 		struct nlattr **attrs)
1093 {
1094 	struct net *net = sock_net(skb->sk);
1095 	struct sk_buff *r_skb;
1096 	u32 *flags = nlmsg_data(nlh);
1097 	u32 sportid = NETLINK_CB(skb).portid;
1098 	u32 seq = nlh->nlmsg_seq;
1099 
1100 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1101 	if (r_skb == NULL)
1102 		return -ENOMEM;
1103 
1104 	if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1105 		BUG();
1106 
1107 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1108 }
1109 
1110 static inline size_t xfrm_sadinfo_msgsize(void)
1111 {
1112 	return NLMSG_ALIGN(4)
1113 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1114 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1115 }
1116 
1117 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1118 			 u32 portid, u32 seq, u32 flags)
1119 {
1120 	struct xfrmk_sadinfo si;
1121 	struct xfrmu_sadhinfo sh;
1122 	struct nlmsghdr *nlh;
1123 	int err;
1124 	u32 *f;
1125 
1126 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1127 	if (nlh == NULL) /* shouldn't really happen ... */
1128 		return -EMSGSIZE;
1129 
1130 	f = nlmsg_data(nlh);
1131 	*f = flags;
1132 	xfrm_sad_getinfo(net, &si);
1133 
1134 	sh.sadhmcnt = si.sadhmcnt;
1135 	sh.sadhcnt = si.sadhcnt;
1136 
1137 	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1138 	if (!err)
1139 		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1140 	if (err) {
1141 		nlmsg_cancel(skb, nlh);
1142 		return err;
1143 	}
1144 
1145 	nlmsg_end(skb, nlh);
1146 	return 0;
1147 }
1148 
1149 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1150 		struct nlattr **attrs)
1151 {
1152 	struct net *net = sock_net(skb->sk);
1153 	struct sk_buff *r_skb;
1154 	u32 *flags = nlmsg_data(nlh);
1155 	u32 sportid = NETLINK_CB(skb).portid;
1156 	u32 seq = nlh->nlmsg_seq;
1157 
1158 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1159 	if (r_skb == NULL)
1160 		return -ENOMEM;
1161 
1162 	if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1163 		BUG();
1164 
1165 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1166 }
1167 
1168 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1169 		struct nlattr **attrs)
1170 {
1171 	struct net *net = sock_net(skb->sk);
1172 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1173 	struct xfrm_state *x;
1174 	struct sk_buff *resp_skb;
1175 	int err = -ESRCH;
1176 
1177 	x = xfrm_user_state_lookup(net, p, attrs, &err);
1178 	if (x == NULL)
1179 		goto out_noput;
1180 
1181 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1182 	if (IS_ERR(resp_skb)) {
1183 		err = PTR_ERR(resp_skb);
1184 	} else {
1185 		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1186 	}
1187 	xfrm_state_put(x);
1188 out_noput:
1189 	return err;
1190 }
1191 
1192 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1193 		struct nlattr **attrs)
1194 {
1195 	struct net *net = sock_net(skb->sk);
1196 	struct xfrm_state *x;
1197 	struct xfrm_userspi_info *p;
1198 	struct sk_buff *resp_skb;
1199 	xfrm_address_t *daddr;
1200 	int family;
1201 	int err;
1202 	u32 mark;
1203 	struct xfrm_mark m;
1204 
1205 	p = nlmsg_data(nlh);
1206 	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1207 	if (err)
1208 		goto out_noput;
1209 
1210 	family = p->info.family;
1211 	daddr = &p->info.id.daddr;
1212 
1213 	x = NULL;
1214 
1215 	mark = xfrm_mark_get(attrs, &m);
1216 	if (p->info.seq) {
1217 		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1218 		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1219 			xfrm_state_put(x);
1220 			x = NULL;
1221 		}
1222 	}
1223 
1224 	if (!x)
1225 		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1226 				  p->info.id.proto, daddr,
1227 				  &p->info.saddr, 1,
1228 				  family);
1229 	err = -ENOENT;
1230 	if (x == NULL)
1231 		goto out_noput;
1232 
1233 	err = xfrm_alloc_spi(x, p->min, p->max);
1234 	if (err)
1235 		goto out;
1236 
1237 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1238 	if (IS_ERR(resp_skb)) {
1239 		err = PTR_ERR(resp_skb);
1240 		goto out;
1241 	}
1242 
1243 	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1244 
1245 out:
1246 	xfrm_state_put(x);
1247 out_noput:
1248 	return err;
1249 }
1250 
1251 static int verify_policy_dir(u8 dir)
1252 {
1253 	switch (dir) {
1254 	case XFRM_POLICY_IN:
1255 	case XFRM_POLICY_OUT:
1256 	case XFRM_POLICY_FWD:
1257 		break;
1258 
1259 	default:
1260 		return -EINVAL;
1261 	}
1262 
1263 	return 0;
1264 }
1265 
1266 static int verify_policy_type(u8 type)
1267 {
1268 	switch (type) {
1269 	case XFRM_POLICY_TYPE_MAIN:
1270 #ifdef CONFIG_XFRM_SUB_POLICY
1271 	case XFRM_POLICY_TYPE_SUB:
1272 #endif
1273 		break;
1274 
1275 	default:
1276 		return -EINVAL;
1277 	}
1278 
1279 	return 0;
1280 }
1281 
1282 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1283 {
1284 	int ret;
1285 
1286 	switch (p->share) {
1287 	case XFRM_SHARE_ANY:
1288 	case XFRM_SHARE_SESSION:
1289 	case XFRM_SHARE_USER:
1290 	case XFRM_SHARE_UNIQUE:
1291 		break;
1292 
1293 	default:
1294 		return -EINVAL;
1295 	}
1296 
1297 	switch (p->action) {
1298 	case XFRM_POLICY_ALLOW:
1299 	case XFRM_POLICY_BLOCK:
1300 		break;
1301 
1302 	default:
1303 		return -EINVAL;
1304 	}
1305 
1306 	switch (p->sel.family) {
1307 	case AF_INET:
1308 		break;
1309 
1310 	case AF_INET6:
1311 #if IS_ENABLED(CONFIG_IPV6)
1312 		break;
1313 #else
1314 		return  -EAFNOSUPPORT;
1315 #endif
1316 
1317 	default:
1318 		return -EINVAL;
1319 	}
1320 
1321 	ret = verify_policy_dir(p->dir);
1322 	if (ret)
1323 		return ret;
1324 	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1325 		return -EINVAL;
1326 
1327 	return 0;
1328 }
1329 
1330 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1331 {
1332 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1333 	struct xfrm_user_sec_ctx *uctx;
1334 
1335 	if (!rt)
1336 		return 0;
1337 
1338 	uctx = nla_data(rt);
1339 	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1340 }
1341 
1342 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1343 			   int nr)
1344 {
1345 	int i;
1346 
1347 	xp->xfrm_nr = nr;
1348 	for (i = 0; i < nr; i++, ut++) {
1349 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1350 
1351 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1352 		memcpy(&t->saddr, &ut->saddr,
1353 		       sizeof(xfrm_address_t));
1354 		t->reqid = ut->reqid;
1355 		t->mode = ut->mode;
1356 		t->share = ut->share;
1357 		t->optional = ut->optional;
1358 		t->aalgos = ut->aalgos;
1359 		t->ealgos = ut->ealgos;
1360 		t->calgos = ut->calgos;
1361 		/* If all masks are ~0, then we allow all algorithms. */
1362 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1363 		t->encap_family = ut->family;
1364 	}
1365 }
1366 
1367 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1368 {
1369 	int i;
1370 
1371 	if (nr > XFRM_MAX_DEPTH)
1372 		return -EINVAL;
1373 
1374 	for (i = 0; i < nr; i++) {
1375 		/* We never validated the ut->family value, so many
1376 		 * applications simply leave it at zero.  The check was
1377 		 * never made and ut->family was ignored because all
1378 		 * templates could be assumed to have the same family as
1379 		 * the policy itself.  Now that we will have ipv4-in-ipv6
1380 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1381 		 */
1382 		if (!ut[i].family)
1383 			ut[i].family = family;
1384 
1385 		switch (ut[i].family) {
1386 		case AF_INET:
1387 			break;
1388 #if IS_ENABLED(CONFIG_IPV6)
1389 		case AF_INET6:
1390 			break;
1391 #endif
1392 		default:
1393 			return -EINVAL;
1394 		}
1395 	}
1396 
1397 	return 0;
1398 }
1399 
1400 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1401 {
1402 	struct nlattr *rt = attrs[XFRMA_TMPL];
1403 
1404 	if (!rt) {
1405 		pol->xfrm_nr = 0;
1406 	} else {
1407 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1408 		int nr = nla_len(rt) / sizeof(*utmpl);
1409 		int err;
1410 
1411 		err = validate_tmpl(nr, utmpl, pol->family);
1412 		if (err)
1413 			return err;
1414 
1415 		copy_templates(pol, utmpl, nr);
1416 	}
1417 	return 0;
1418 }
1419 
1420 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1421 {
1422 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1423 	struct xfrm_userpolicy_type *upt;
1424 	u8 type = XFRM_POLICY_TYPE_MAIN;
1425 	int err;
1426 
1427 	if (rt) {
1428 		upt = nla_data(rt);
1429 		type = upt->type;
1430 	}
1431 
1432 	err = verify_policy_type(type);
1433 	if (err)
1434 		return err;
1435 
1436 	*tp = type;
1437 	return 0;
1438 }
1439 
1440 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1441 {
1442 	xp->priority = p->priority;
1443 	xp->index = p->index;
1444 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1445 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1446 	xp->action = p->action;
1447 	xp->flags = p->flags;
1448 	xp->family = p->sel.family;
1449 	/* XXX xp->share = p->share; */
1450 }
1451 
1452 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1453 {
1454 	memset(p, 0, sizeof(*p));
1455 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1456 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1457 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1458 	p->priority = xp->priority;
1459 	p->index = xp->index;
1460 	p->sel.family = xp->family;
1461 	p->dir = dir;
1462 	p->action = xp->action;
1463 	p->flags = xp->flags;
1464 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1465 }
1466 
1467 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1468 {
1469 	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1470 	int err;
1471 
1472 	if (!xp) {
1473 		*errp = -ENOMEM;
1474 		return NULL;
1475 	}
1476 
1477 	copy_from_user_policy(xp, p);
1478 
1479 	err = copy_from_user_policy_type(&xp->type, attrs);
1480 	if (err)
1481 		goto error;
1482 
1483 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1484 		err = copy_from_user_sec_ctx(xp, attrs);
1485 	if (err)
1486 		goto error;
1487 
1488 	xfrm_mark_get(attrs, &xp->mark);
1489 
1490 	return xp;
1491  error:
1492 	*errp = err;
1493 	xp->walk.dead = 1;
1494 	xfrm_policy_destroy(xp);
1495 	return NULL;
1496 }
1497 
1498 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1499 		struct nlattr **attrs)
1500 {
1501 	struct net *net = sock_net(skb->sk);
1502 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1503 	struct xfrm_policy *xp;
1504 	struct km_event c;
1505 	int err;
1506 	int excl;
1507 
1508 	err = verify_newpolicy_info(p);
1509 	if (err)
1510 		return err;
1511 	err = verify_sec_ctx_len(attrs);
1512 	if (err)
1513 		return err;
1514 
1515 	xp = xfrm_policy_construct(net, p, attrs, &err);
1516 	if (!xp)
1517 		return err;
1518 
1519 	/* shouldn't excl be based on nlh flags??
1520 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1521 	 * in netlink excl is a flag and you wouldnt need
1522 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1523 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1524 	err = xfrm_policy_insert(p->dir, xp, excl);
1525 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1526 
1527 	if (err) {
1528 		security_xfrm_policy_free(xp->security);
1529 		kfree(xp);
1530 		return err;
1531 	}
1532 
1533 	c.event = nlh->nlmsg_type;
1534 	c.seq = nlh->nlmsg_seq;
1535 	c.portid = nlh->nlmsg_pid;
1536 	km_policy_notify(xp, p->dir, &c);
1537 
1538 	xfrm_pol_put(xp);
1539 
1540 	return 0;
1541 }
1542 
1543 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1544 {
1545 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1546 	int i;
1547 
1548 	if (xp->xfrm_nr == 0)
1549 		return 0;
1550 
1551 	for (i = 0; i < xp->xfrm_nr; i++) {
1552 		struct xfrm_user_tmpl *up = &vec[i];
1553 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1554 
1555 		memset(up, 0, sizeof(*up));
1556 		memcpy(&up->id, &kp->id, sizeof(up->id));
1557 		up->family = kp->encap_family;
1558 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1559 		up->reqid = kp->reqid;
1560 		up->mode = kp->mode;
1561 		up->share = kp->share;
1562 		up->optional = kp->optional;
1563 		up->aalgos = kp->aalgos;
1564 		up->ealgos = kp->ealgos;
1565 		up->calgos = kp->calgos;
1566 	}
1567 
1568 	return nla_put(skb, XFRMA_TMPL,
1569 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1570 }
1571 
1572 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1573 {
1574 	if (x->security) {
1575 		return copy_sec_ctx(x->security, skb);
1576 	}
1577 	return 0;
1578 }
1579 
1580 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1581 {
1582 	if (xp->security)
1583 		return copy_sec_ctx(xp->security, skb);
1584 	return 0;
1585 }
1586 static inline size_t userpolicy_type_attrsize(void)
1587 {
1588 #ifdef CONFIG_XFRM_SUB_POLICY
1589 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1590 #else
1591 	return 0;
1592 #endif
1593 }
1594 
1595 #ifdef CONFIG_XFRM_SUB_POLICY
1596 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1597 {
1598 	struct xfrm_userpolicy_type upt = {
1599 		.type = type,
1600 	};
1601 
1602 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1603 }
1604 
1605 #else
1606 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1607 {
1608 	return 0;
1609 }
1610 #endif
1611 
1612 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1613 {
1614 	struct xfrm_dump_info *sp = ptr;
1615 	struct xfrm_userpolicy_info *p;
1616 	struct sk_buff *in_skb = sp->in_skb;
1617 	struct sk_buff *skb = sp->out_skb;
1618 	struct nlmsghdr *nlh;
1619 	int err;
1620 
1621 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1622 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1623 	if (nlh == NULL)
1624 		return -EMSGSIZE;
1625 
1626 	p = nlmsg_data(nlh);
1627 	copy_to_user_policy(xp, p, dir);
1628 	err = copy_to_user_tmpl(xp, skb);
1629 	if (!err)
1630 		err = copy_to_user_sec_ctx(xp, skb);
1631 	if (!err)
1632 		err = copy_to_user_policy_type(xp->type, skb);
1633 	if (!err)
1634 		err = xfrm_mark_put(skb, &xp->mark);
1635 	if (err) {
1636 		nlmsg_cancel(skb, nlh);
1637 		return err;
1638 	}
1639 	nlmsg_end(skb, nlh);
1640 	return 0;
1641 }
1642 
1643 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1644 {
1645 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1646 	struct net *net = sock_net(cb->skb->sk);
1647 
1648 	xfrm_policy_walk_done(walk, net);
1649 	return 0;
1650 }
1651 
1652 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1653 {
1654 	struct net *net = sock_net(skb->sk);
1655 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1656 	struct xfrm_dump_info info;
1657 
1658 	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1659 		     sizeof(cb->args) - sizeof(cb->args[0]));
1660 
1661 	info.in_skb = cb->skb;
1662 	info.out_skb = skb;
1663 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1664 	info.nlmsg_flags = NLM_F_MULTI;
1665 
1666 	if (!cb->args[0]) {
1667 		cb->args[0] = 1;
1668 		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1669 	}
1670 
1671 	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1672 
1673 	return skb->len;
1674 }
1675 
1676 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1677 					  struct xfrm_policy *xp,
1678 					  int dir, u32 seq)
1679 {
1680 	struct xfrm_dump_info info;
1681 	struct sk_buff *skb;
1682 	int err;
1683 
1684 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1685 	if (!skb)
1686 		return ERR_PTR(-ENOMEM);
1687 
1688 	info.in_skb = in_skb;
1689 	info.out_skb = skb;
1690 	info.nlmsg_seq = seq;
1691 	info.nlmsg_flags = 0;
1692 
1693 	err = dump_one_policy(xp, dir, 0, &info);
1694 	if (err) {
1695 		kfree_skb(skb);
1696 		return ERR_PTR(err);
1697 	}
1698 
1699 	return skb;
1700 }
1701 
1702 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1703 		struct nlattr **attrs)
1704 {
1705 	struct net *net = sock_net(skb->sk);
1706 	struct xfrm_policy *xp;
1707 	struct xfrm_userpolicy_id *p;
1708 	u8 type = XFRM_POLICY_TYPE_MAIN;
1709 	int err;
1710 	struct km_event c;
1711 	int delete;
1712 	struct xfrm_mark m;
1713 	u32 mark = xfrm_mark_get(attrs, &m);
1714 
1715 	p = nlmsg_data(nlh);
1716 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1717 
1718 	err = copy_from_user_policy_type(&type, attrs);
1719 	if (err)
1720 		return err;
1721 
1722 	err = verify_policy_dir(p->dir);
1723 	if (err)
1724 		return err;
1725 
1726 	if (p->index)
1727 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1728 	else {
1729 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1730 		struct xfrm_sec_ctx *ctx;
1731 
1732 		err = verify_sec_ctx_len(attrs);
1733 		if (err)
1734 			return err;
1735 
1736 		ctx = NULL;
1737 		if (rt) {
1738 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1739 
1740 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1741 			if (err)
1742 				return err;
1743 		}
1744 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1745 					   ctx, delete, &err);
1746 		security_xfrm_policy_free(ctx);
1747 	}
1748 	if (xp == NULL)
1749 		return -ENOENT;
1750 
1751 	if (!delete) {
1752 		struct sk_buff *resp_skb;
1753 
1754 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1755 		if (IS_ERR(resp_skb)) {
1756 			err = PTR_ERR(resp_skb);
1757 		} else {
1758 			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1759 					    NETLINK_CB(skb).portid);
1760 		}
1761 	} else {
1762 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1763 
1764 		if (err != 0)
1765 			goto out;
1766 
1767 		c.data.byid = p->index;
1768 		c.event = nlh->nlmsg_type;
1769 		c.seq = nlh->nlmsg_seq;
1770 		c.portid = nlh->nlmsg_pid;
1771 		km_policy_notify(xp, p->dir, &c);
1772 	}
1773 
1774 out:
1775 	xfrm_pol_put(xp);
1776 	if (delete && err == 0)
1777 		xfrm_garbage_collect(net);
1778 	return err;
1779 }
1780 
1781 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1782 		struct nlattr **attrs)
1783 {
1784 	struct net *net = sock_net(skb->sk);
1785 	struct km_event c;
1786 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1787 	int err;
1788 
1789 	err = xfrm_state_flush(net, p->proto, true);
1790 	if (err) {
1791 		if (err == -ESRCH) /* empty table */
1792 			return 0;
1793 		return err;
1794 	}
1795 	c.data.proto = p->proto;
1796 	c.event = nlh->nlmsg_type;
1797 	c.seq = nlh->nlmsg_seq;
1798 	c.portid = nlh->nlmsg_pid;
1799 	c.net = net;
1800 	km_state_notify(NULL, &c);
1801 
1802 	return 0;
1803 }
1804 
1805 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1806 {
1807 	size_t replay_size = x->replay_esn ?
1808 			      xfrm_replay_state_esn_len(x->replay_esn) :
1809 			      sizeof(struct xfrm_replay_state);
1810 
1811 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1812 	       + nla_total_size(replay_size)
1813 	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1814 	       + nla_total_size(sizeof(struct xfrm_mark))
1815 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1816 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1817 }
1818 
1819 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1820 {
1821 	struct xfrm_aevent_id *id;
1822 	struct nlmsghdr *nlh;
1823 	int err;
1824 
1825 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1826 	if (nlh == NULL)
1827 		return -EMSGSIZE;
1828 
1829 	id = nlmsg_data(nlh);
1830 	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1831 	id->sa_id.spi = x->id.spi;
1832 	id->sa_id.family = x->props.family;
1833 	id->sa_id.proto = x->id.proto;
1834 	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1835 	id->reqid = x->props.reqid;
1836 	id->flags = c->data.aevent;
1837 
1838 	if (x->replay_esn) {
1839 		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1840 			      xfrm_replay_state_esn_len(x->replay_esn),
1841 			      x->replay_esn);
1842 	} else {
1843 		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1844 			      &x->replay);
1845 	}
1846 	if (err)
1847 		goto out_cancel;
1848 	err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1849 	if (err)
1850 		goto out_cancel;
1851 
1852 	if (id->flags & XFRM_AE_RTHR) {
1853 		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1854 		if (err)
1855 			goto out_cancel;
1856 	}
1857 	if (id->flags & XFRM_AE_ETHR) {
1858 		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1859 				  x->replay_maxage * 10 / HZ);
1860 		if (err)
1861 			goto out_cancel;
1862 	}
1863 	err = xfrm_mark_put(skb, &x->mark);
1864 	if (err)
1865 		goto out_cancel;
1866 
1867 	nlmsg_end(skb, nlh);
1868 	return 0;
1869 
1870 out_cancel:
1871 	nlmsg_cancel(skb, nlh);
1872 	return err;
1873 }
1874 
1875 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1876 		struct nlattr **attrs)
1877 {
1878 	struct net *net = sock_net(skb->sk);
1879 	struct xfrm_state *x;
1880 	struct sk_buff *r_skb;
1881 	int err;
1882 	struct km_event c;
1883 	u32 mark;
1884 	struct xfrm_mark m;
1885 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1886 	struct xfrm_usersa_id *id = &p->sa_id;
1887 
1888 	mark = xfrm_mark_get(attrs, &m);
1889 
1890 	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1891 	if (x == NULL)
1892 		return -ESRCH;
1893 
1894 	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1895 	if (r_skb == NULL) {
1896 		xfrm_state_put(x);
1897 		return -ENOMEM;
1898 	}
1899 
1900 	/*
1901 	 * XXX: is this lock really needed - none of the other
1902 	 * gets lock (the concern is things getting updated
1903 	 * while we are still reading) - jhs
1904 	*/
1905 	spin_lock_bh(&x->lock);
1906 	c.data.aevent = p->flags;
1907 	c.seq = nlh->nlmsg_seq;
1908 	c.portid = nlh->nlmsg_pid;
1909 
1910 	if (build_aevent(r_skb, x, &c) < 0)
1911 		BUG();
1912 	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1913 	spin_unlock_bh(&x->lock);
1914 	xfrm_state_put(x);
1915 	return err;
1916 }
1917 
1918 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1919 		struct nlattr **attrs)
1920 {
1921 	struct net *net = sock_net(skb->sk);
1922 	struct xfrm_state *x;
1923 	struct km_event c;
1924 	int err = -EINVAL;
1925 	u32 mark = 0;
1926 	struct xfrm_mark m;
1927 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1928 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1929 	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1930 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1931 
1932 	if (!lt && !rp && !re)
1933 		return err;
1934 
1935 	/* pedantic mode - thou shalt sayeth replaceth */
1936 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1937 		return err;
1938 
1939 	mark = xfrm_mark_get(attrs, &m);
1940 
1941 	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1942 	if (x == NULL)
1943 		return -ESRCH;
1944 
1945 	if (x->km.state != XFRM_STATE_VALID)
1946 		goto out;
1947 
1948 	err = xfrm_replay_verify_len(x->replay_esn, re);
1949 	if (err)
1950 		goto out;
1951 
1952 	spin_lock_bh(&x->lock);
1953 	xfrm_update_ae_params(x, attrs, 1);
1954 	spin_unlock_bh(&x->lock);
1955 
1956 	c.event = nlh->nlmsg_type;
1957 	c.seq = nlh->nlmsg_seq;
1958 	c.portid = nlh->nlmsg_pid;
1959 	c.data.aevent = XFRM_AE_CU;
1960 	km_state_notify(x, &c);
1961 	err = 0;
1962 out:
1963 	xfrm_state_put(x);
1964 	return err;
1965 }
1966 
1967 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1968 		struct nlattr **attrs)
1969 {
1970 	struct net *net = sock_net(skb->sk);
1971 	struct km_event c;
1972 	u8 type = XFRM_POLICY_TYPE_MAIN;
1973 	int err;
1974 
1975 	err = copy_from_user_policy_type(&type, attrs);
1976 	if (err)
1977 		return err;
1978 
1979 	err = xfrm_policy_flush(net, type, true);
1980 	if (err) {
1981 		if (err == -ESRCH) /* empty table */
1982 			return 0;
1983 		return err;
1984 	}
1985 
1986 	c.data.type = type;
1987 	c.event = nlh->nlmsg_type;
1988 	c.seq = nlh->nlmsg_seq;
1989 	c.portid = nlh->nlmsg_pid;
1990 	c.net = net;
1991 	km_policy_notify(NULL, 0, &c);
1992 	return 0;
1993 }
1994 
1995 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1996 		struct nlattr **attrs)
1997 {
1998 	struct net *net = sock_net(skb->sk);
1999 	struct xfrm_policy *xp;
2000 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2001 	struct xfrm_userpolicy_info *p = &up->pol;
2002 	u8 type = XFRM_POLICY_TYPE_MAIN;
2003 	int err = -ENOENT;
2004 	struct xfrm_mark m;
2005 	u32 mark = xfrm_mark_get(attrs, &m);
2006 
2007 	err = copy_from_user_policy_type(&type, attrs);
2008 	if (err)
2009 		return err;
2010 
2011 	err = verify_policy_dir(p->dir);
2012 	if (err)
2013 		return err;
2014 
2015 	if (p->index)
2016 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2017 	else {
2018 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2019 		struct xfrm_sec_ctx *ctx;
2020 
2021 		err = verify_sec_ctx_len(attrs);
2022 		if (err)
2023 			return err;
2024 
2025 		ctx = NULL;
2026 		if (rt) {
2027 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2028 
2029 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2030 			if (err)
2031 				return err;
2032 		}
2033 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2034 					   &p->sel, ctx, 0, &err);
2035 		security_xfrm_policy_free(ctx);
2036 	}
2037 	if (xp == NULL)
2038 		return -ENOENT;
2039 
2040 	if (unlikely(xp->walk.dead))
2041 		goto out;
2042 
2043 	err = 0;
2044 	if (up->hard) {
2045 		xfrm_policy_delete(xp, p->dir);
2046 		xfrm_audit_policy_delete(xp, 1, true);
2047 	} else {
2048 		// reset the timers here?
2049 		WARN(1, "Don't know what to do with soft policy expire\n");
2050 	}
2051 	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2052 
2053 out:
2054 	xfrm_pol_put(xp);
2055 	return err;
2056 }
2057 
2058 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2059 		struct nlattr **attrs)
2060 {
2061 	struct net *net = sock_net(skb->sk);
2062 	struct xfrm_state *x;
2063 	int err;
2064 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2065 	struct xfrm_usersa_info *p = &ue->state;
2066 	struct xfrm_mark m;
2067 	u32 mark = xfrm_mark_get(attrs, &m);
2068 
2069 	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2070 
2071 	err = -ENOENT;
2072 	if (x == NULL)
2073 		return err;
2074 
2075 	spin_lock_bh(&x->lock);
2076 	err = -EINVAL;
2077 	if (x->km.state != XFRM_STATE_VALID)
2078 		goto out;
2079 	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2080 
2081 	if (ue->hard) {
2082 		__xfrm_state_delete(x);
2083 		xfrm_audit_state_delete(x, 1, true);
2084 	}
2085 	err = 0;
2086 out:
2087 	spin_unlock_bh(&x->lock);
2088 	xfrm_state_put(x);
2089 	return err;
2090 }
2091 
2092 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2093 		struct nlattr **attrs)
2094 {
2095 	struct net *net = sock_net(skb->sk);
2096 	struct xfrm_policy *xp;
2097 	struct xfrm_user_tmpl *ut;
2098 	int i;
2099 	struct nlattr *rt = attrs[XFRMA_TMPL];
2100 	struct xfrm_mark mark;
2101 
2102 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2103 	struct xfrm_state *x = xfrm_state_alloc(net);
2104 	int err = -ENOMEM;
2105 
2106 	if (!x)
2107 		goto nomem;
2108 
2109 	xfrm_mark_get(attrs, &mark);
2110 
2111 	err = verify_newpolicy_info(&ua->policy);
2112 	if (err)
2113 		goto bad_policy;
2114 
2115 	/*   build an XP */
2116 	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2117 	if (!xp)
2118 		goto free_state;
2119 
2120 	memcpy(&x->id, &ua->id, sizeof(ua->id));
2121 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2122 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2123 	xp->mark.m = x->mark.m = mark.m;
2124 	xp->mark.v = x->mark.v = mark.v;
2125 	ut = nla_data(rt);
2126 	/* extract the templates and for each call km_key */
2127 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2128 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2129 		memcpy(&x->id, &t->id, sizeof(x->id));
2130 		x->props.mode = t->mode;
2131 		x->props.reqid = t->reqid;
2132 		x->props.family = ut->family;
2133 		t->aalgos = ua->aalgos;
2134 		t->ealgos = ua->ealgos;
2135 		t->calgos = ua->calgos;
2136 		err = km_query(x, t, xp);
2137 
2138 	}
2139 
2140 	kfree(x);
2141 	kfree(xp);
2142 
2143 	return 0;
2144 
2145 bad_policy:
2146 	WARN(1, "BAD policy passed\n");
2147 free_state:
2148 	kfree(x);
2149 nomem:
2150 	return err;
2151 }
2152 
2153 #ifdef CONFIG_XFRM_MIGRATE
2154 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2155 				  struct xfrm_kmaddress *k,
2156 				  struct nlattr **attrs, int *num)
2157 {
2158 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2159 	struct xfrm_user_migrate *um;
2160 	int i, num_migrate;
2161 
2162 	if (k != NULL) {
2163 		struct xfrm_user_kmaddress *uk;
2164 
2165 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2166 		memcpy(&k->local, &uk->local, sizeof(k->local));
2167 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2168 		k->family = uk->family;
2169 		k->reserved = uk->reserved;
2170 	}
2171 
2172 	um = nla_data(rt);
2173 	num_migrate = nla_len(rt) / sizeof(*um);
2174 
2175 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2176 		return -EINVAL;
2177 
2178 	for (i = 0; i < num_migrate; i++, um++, ma++) {
2179 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2180 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2181 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2182 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2183 
2184 		ma->proto = um->proto;
2185 		ma->mode = um->mode;
2186 		ma->reqid = um->reqid;
2187 
2188 		ma->old_family = um->old_family;
2189 		ma->new_family = um->new_family;
2190 	}
2191 
2192 	*num = i;
2193 	return 0;
2194 }
2195 
2196 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2197 			   struct nlattr **attrs)
2198 {
2199 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2200 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2201 	struct xfrm_kmaddress km, *kmp;
2202 	u8 type;
2203 	int err;
2204 	int n = 0;
2205 	struct net *net = sock_net(skb->sk);
2206 
2207 	if (attrs[XFRMA_MIGRATE] == NULL)
2208 		return -EINVAL;
2209 
2210 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2211 
2212 	err = copy_from_user_policy_type(&type, attrs);
2213 	if (err)
2214 		return err;
2215 
2216 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2217 	if (err)
2218 		return err;
2219 
2220 	if (!n)
2221 		return 0;
2222 
2223 	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2224 
2225 	return 0;
2226 }
2227 #else
2228 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2229 			   struct nlattr **attrs)
2230 {
2231 	return -ENOPROTOOPT;
2232 }
2233 #endif
2234 
2235 #ifdef CONFIG_XFRM_MIGRATE
2236 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2237 {
2238 	struct xfrm_user_migrate um;
2239 
2240 	memset(&um, 0, sizeof(um));
2241 	um.proto = m->proto;
2242 	um.mode = m->mode;
2243 	um.reqid = m->reqid;
2244 	um.old_family = m->old_family;
2245 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2246 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2247 	um.new_family = m->new_family;
2248 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2249 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2250 
2251 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2252 }
2253 
2254 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2255 {
2256 	struct xfrm_user_kmaddress uk;
2257 
2258 	memset(&uk, 0, sizeof(uk));
2259 	uk.family = k->family;
2260 	uk.reserved = k->reserved;
2261 	memcpy(&uk.local, &k->local, sizeof(uk.local));
2262 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2263 
2264 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2265 }
2266 
2267 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2268 {
2269 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2270 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2271 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2272 	      + userpolicy_type_attrsize();
2273 }
2274 
2275 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2276 			 int num_migrate, const struct xfrm_kmaddress *k,
2277 			 const struct xfrm_selector *sel, u8 dir, u8 type)
2278 {
2279 	const struct xfrm_migrate *mp;
2280 	struct xfrm_userpolicy_id *pol_id;
2281 	struct nlmsghdr *nlh;
2282 	int i, err;
2283 
2284 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2285 	if (nlh == NULL)
2286 		return -EMSGSIZE;
2287 
2288 	pol_id = nlmsg_data(nlh);
2289 	/* copy data from selector, dir, and type to the pol_id */
2290 	memset(pol_id, 0, sizeof(*pol_id));
2291 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2292 	pol_id->dir = dir;
2293 
2294 	if (k != NULL) {
2295 		err = copy_to_user_kmaddress(k, skb);
2296 		if (err)
2297 			goto out_cancel;
2298 	}
2299 	err = copy_to_user_policy_type(type, skb);
2300 	if (err)
2301 		goto out_cancel;
2302 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2303 		err = copy_to_user_migrate(mp, skb);
2304 		if (err)
2305 			goto out_cancel;
2306 	}
2307 
2308 	nlmsg_end(skb, nlh);
2309 	return 0;
2310 
2311 out_cancel:
2312 	nlmsg_cancel(skb, nlh);
2313 	return err;
2314 }
2315 
2316 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2317 			     const struct xfrm_migrate *m, int num_migrate,
2318 			     const struct xfrm_kmaddress *k)
2319 {
2320 	struct net *net = &init_net;
2321 	struct sk_buff *skb;
2322 
2323 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2324 	if (skb == NULL)
2325 		return -ENOMEM;
2326 
2327 	/* build migrate */
2328 	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2329 		BUG();
2330 
2331 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2332 }
2333 #else
2334 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2335 			     const struct xfrm_migrate *m, int num_migrate,
2336 			     const struct xfrm_kmaddress *k)
2337 {
2338 	return -ENOPROTOOPT;
2339 }
2340 #endif
2341 
2342 #define XMSGSIZE(type) sizeof(struct type)
2343 
2344 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2345 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2346 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2347 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2348 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2349 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2350 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2351 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2352 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2353 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2354 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2355 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2356 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2357 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2358 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2359 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2360 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2361 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2362 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2363 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2364 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2365 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2366 };
2367 
2368 #undef XMSGSIZE
2369 
2370 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2371 	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2372 	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2373 	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2374 	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2375 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2376 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2377 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2378 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2379 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2380 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2381 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2382 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2383 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2384 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2385 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2386 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2387 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2388 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2389 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2390 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2391 	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2392 	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2393 	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2394 	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2395 	[XFRMA_PROTO]		= { .type = NLA_U8 },
2396 	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2397 };
2398 
2399 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2400 	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2401 	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2402 };
2403 
2404 static const struct xfrm_link {
2405 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2406 	int (*dump)(struct sk_buff *, struct netlink_callback *);
2407 	int (*done)(struct netlink_callback *);
2408 	const struct nla_policy *nla_pol;
2409 	int nla_max;
2410 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2411 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2412 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2413 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2414 						   .dump = xfrm_dump_sa,
2415 						   .done = xfrm_dump_sa_done  },
2416 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2417 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2418 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2419 						   .dump = xfrm_dump_policy,
2420 						   .done = xfrm_dump_policy_done },
2421 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2422 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2423 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2424 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2425 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2426 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2427 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2428 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2429 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2430 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2431 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2432 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2433 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2434 						   .nla_pol = xfrma_spd_policy,
2435 						   .nla_max = XFRMA_SPD_MAX },
2436 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2437 };
2438 
2439 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2440 {
2441 	struct net *net = sock_net(skb->sk);
2442 	struct nlattr *attrs[XFRMA_MAX+1];
2443 	const struct xfrm_link *link;
2444 	int type, err;
2445 
2446 #ifdef CONFIG_COMPAT
2447 	if (is_compat_task())
2448 		return -ENOTSUPP;
2449 #endif
2450 
2451 	type = nlh->nlmsg_type;
2452 	if (type > XFRM_MSG_MAX)
2453 		return -EINVAL;
2454 
2455 	type -= XFRM_MSG_BASE;
2456 	link = &xfrm_dispatch[type];
2457 
2458 	/* All operations require privileges, even GET */
2459 	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2460 		return -EPERM;
2461 
2462 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2463 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2464 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2465 		if (link->dump == NULL)
2466 			return -EINVAL;
2467 
2468 		{
2469 			struct netlink_dump_control c = {
2470 				.dump = link->dump,
2471 				.done = link->done,
2472 			};
2473 			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2474 		}
2475 	}
2476 
2477 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2478 			  link->nla_max ? : XFRMA_MAX,
2479 			  link->nla_pol ? : xfrma_policy);
2480 	if (err < 0)
2481 		return err;
2482 
2483 	if (link->doit == NULL)
2484 		return -EINVAL;
2485 
2486 	return link->doit(skb, nlh, attrs);
2487 }
2488 
2489 static void xfrm_netlink_rcv(struct sk_buff *skb)
2490 {
2491 	struct net *net = sock_net(skb->sk);
2492 
2493 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2494 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2495 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2496 }
2497 
2498 static inline size_t xfrm_expire_msgsize(void)
2499 {
2500 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2501 	       + nla_total_size(sizeof(struct xfrm_mark));
2502 }
2503 
2504 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2505 {
2506 	struct xfrm_user_expire *ue;
2507 	struct nlmsghdr *nlh;
2508 	int err;
2509 
2510 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2511 	if (nlh == NULL)
2512 		return -EMSGSIZE;
2513 
2514 	ue = nlmsg_data(nlh);
2515 	copy_to_user_state(x, &ue->state);
2516 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2517 
2518 	err = xfrm_mark_put(skb, &x->mark);
2519 	if (err)
2520 		return err;
2521 
2522 	nlmsg_end(skb, nlh);
2523 	return 0;
2524 }
2525 
2526 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2527 {
2528 	struct net *net = xs_net(x);
2529 	struct sk_buff *skb;
2530 
2531 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2532 	if (skb == NULL)
2533 		return -ENOMEM;
2534 
2535 	if (build_expire(skb, x, c) < 0) {
2536 		kfree_skb(skb);
2537 		return -EMSGSIZE;
2538 	}
2539 
2540 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2541 }
2542 
2543 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2544 {
2545 	struct net *net = xs_net(x);
2546 	struct sk_buff *skb;
2547 
2548 	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2549 	if (skb == NULL)
2550 		return -ENOMEM;
2551 
2552 	if (build_aevent(skb, x, c) < 0)
2553 		BUG();
2554 
2555 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2556 }
2557 
2558 static int xfrm_notify_sa_flush(const struct km_event *c)
2559 {
2560 	struct net *net = c->net;
2561 	struct xfrm_usersa_flush *p;
2562 	struct nlmsghdr *nlh;
2563 	struct sk_buff *skb;
2564 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2565 
2566 	skb = nlmsg_new(len, GFP_ATOMIC);
2567 	if (skb == NULL)
2568 		return -ENOMEM;
2569 
2570 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2571 	if (nlh == NULL) {
2572 		kfree_skb(skb);
2573 		return -EMSGSIZE;
2574 	}
2575 
2576 	p = nlmsg_data(nlh);
2577 	p->proto = c->data.proto;
2578 
2579 	nlmsg_end(skb, nlh);
2580 
2581 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2582 }
2583 
2584 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2585 {
2586 	size_t l = 0;
2587 	if (x->aead)
2588 		l += nla_total_size(aead_len(x->aead));
2589 	if (x->aalg) {
2590 		l += nla_total_size(sizeof(struct xfrm_algo) +
2591 				    (x->aalg->alg_key_len + 7) / 8);
2592 		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2593 	}
2594 	if (x->ealg)
2595 		l += nla_total_size(xfrm_alg_len(x->ealg));
2596 	if (x->calg)
2597 		l += nla_total_size(sizeof(*x->calg));
2598 	if (x->encap)
2599 		l += nla_total_size(sizeof(*x->encap));
2600 	if (x->tfcpad)
2601 		l += nla_total_size(sizeof(x->tfcpad));
2602 	if (x->replay_esn)
2603 		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2604 	else
2605 		l += nla_total_size(sizeof(struct xfrm_replay_state));
2606 	if (x->security)
2607 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2608 				    x->security->ctx_len);
2609 	if (x->coaddr)
2610 		l += nla_total_size(sizeof(*x->coaddr));
2611 	if (x->props.extra_flags)
2612 		l += nla_total_size(sizeof(x->props.extra_flags));
2613 
2614 	/* Must count x->lastused as it may become non-zero behind our back. */
2615 	l += nla_total_size(sizeof(u64));
2616 
2617 	return l;
2618 }
2619 
2620 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2621 {
2622 	struct net *net = xs_net(x);
2623 	struct xfrm_usersa_info *p;
2624 	struct xfrm_usersa_id *id;
2625 	struct nlmsghdr *nlh;
2626 	struct sk_buff *skb;
2627 	int len = xfrm_sa_len(x);
2628 	int headlen, err;
2629 
2630 	headlen = sizeof(*p);
2631 	if (c->event == XFRM_MSG_DELSA) {
2632 		len += nla_total_size(headlen);
2633 		headlen = sizeof(*id);
2634 		len += nla_total_size(sizeof(struct xfrm_mark));
2635 	}
2636 	len += NLMSG_ALIGN(headlen);
2637 
2638 	skb = nlmsg_new(len, GFP_ATOMIC);
2639 	if (skb == NULL)
2640 		return -ENOMEM;
2641 
2642 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2643 	err = -EMSGSIZE;
2644 	if (nlh == NULL)
2645 		goto out_free_skb;
2646 
2647 	p = nlmsg_data(nlh);
2648 	if (c->event == XFRM_MSG_DELSA) {
2649 		struct nlattr *attr;
2650 
2651 		id = nlmsg_data(nlh);
2652 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2653 		id->spi = x->id.spi;
2654 		id->family = x->props.family;
2655 		id->proto = x->id.proto;
2656 
2657 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2658 		err = -EMSGSIZE;
2659 		if (attr == NULL)
2660 			goto out_free_skb;
2661 
2662 		p = nla_data(attr);
2663 	}
2664 	err = copy_to_user_state_extra(x, p, skb);
2665 	if (err)
2666 		goto out_free_skb;
2667 
2668 	nlmsg_end(skb, nlh);
2669 
2670 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2671 
2672 out_free_skb:
2673 	kfree_skb(skb);
2674 	return err;
2675 }
2676 
2677 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2678 {
2679 
2680 	switch (c->event) {
2681 	case XFRM_MSG_EXPIRE:
2682 		return xfrm_exp_state_notify(x, c);
2683 	case XFRM_MSG_NEWAE:
2684 		return xfrm_aevent_state_notify(x, c);
2685 	case XFRM_MSG_DELSA:
2686 	case XFRM_MSG_UPDSA:
2687 	case XFRM_MSG_NEWSA:
2688 		return xfrm_notify_sa(x, c);
2689 	case XFRM_MSG_FLUSHSA:
2690 		return xfrm_notify_sa_flush(c);
2691 	default:
2692 		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2693 		       c->event);
2694 		break;
2695 	}
2696 
2697 	return 0;
2698 
2699 }
2700 
2701 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2702 					  struct xfrm_policy *xp)
2703 {
2704 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2705 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2706 	       + nla_total_size(sizeof(struct xfrm_mark))
2707 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2708 	       + userpolicy_type_attrsize();
2709 }
2710 
2711 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2712 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2713 {
2714 	__u32 seq = xfrm_get_acqseq();
2715 	struct xfrm_user_acquire *ua;
2716 	struct nlmsghdr *nlh;
2717 	int err;
2718 
2719 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2720 	if (nlh == NULL)
2721 		return -EMSGSIZE;
2722 
2723 	ua = nlmsg_data(nlh);
2724 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2725 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2726 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2727 	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2728 	ua->aalgos = xt->aalgos;
2729 	ua->ealgos = xt->ealgos;
2730 	ua->calgos = xt->calgos;
2731 	ua->seq = x->km.seq = seq;
2732 
2733 	err = copy_to_user_tmpl(xp, skb);
2734 	if (!err)
2735 		err = copy_to_user_state_sec_ctx(x, skb);
2736 	if (!err)
2737 		err = copy_to_user_policy_type(xp->type, skb);
2738 	if (!err)
2739 		err = xfrm_mark_put(skb, &xp->mark);
2740 	if (err) {
2741 		nlmsg_cancel(skb, nlh);
2742 		return err;
2743 	}
2744 
2745 	nlmsg_end(skb, nlh);
2746 	return 0;
2747 }
2748 
2749 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2750 			     struct xfrm_policy *xp)
2751 {
2752 	struct net *net = xs_net(x);
2753 	struct sk_buff *skb;
2754 
2755 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2756 	if (skb == NULL)
2757 		return -ENOMEM;
2758 
2759 	if (build_acquire(skb, x, xt, xp) < 0)
2760 		BUG();
2761 
2762 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2763 }
2764 
2765 /* User gives us xfrm_user_policy_info followed by an array of 0
2766  * or more templates.
2767  */
2768 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2769 					       u8 *data, int len, int *dir)
2770 {
2771 	struct net *net = sock_net(sk);
2772 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2773 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2774 	struct xfrm_policy *xp;
2775 	int nr;
2776 
2777 	switch (sk->sk_family) {
2778 	case AF_INET:
2779 		if (opt != IP_XFRM_POLICY) {
2780 			*dir = -EOPNOTSUPP;
2781 			return NULL;
2782 		}
2783 		break;
2784 #if IS_ENABLED(CONFIG_IPV6)
2785 	case AF_INET6:
2786 		if (opt != IPV6_XFRM_POLICY) {
2787 			*dir = -EOPNOTSUPP;
2788 			return NULL;
2789 		}
2790 		break;
2791 #endif
2792 	default:
2793 		*dir = -EINVAL;
2794 		return NULL;
2795 	}
2796 
2797 	*dir = -EINVAL;
2798 
2799 	if (len < sizeof(*p) ||
2800 	    verify_newpolicy_info(p))
2801 		return NULL;
2802 
2803 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2804 	if (validate_tmpl(nr, ut, p->sel.family))
2805 		return NULL;
2806 
2807 	if (p->dir > XFRM_POLICY_OUT)
2808 		return NULL;
2809 
2810 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2811 	if (xp == NULL) {
2812 		*dir = -ENOBUFS;
2813 		return NULL;
2814 	}
2815 
2816 	copy_from_user_policy(xp, p);
2817 	xp->type = XFRM_POLICY_TYPE_MAIN;
2818 	copy_templates(xp, ut, nr);
2819 
2820 	*dir = p->dir;
2821 
2822 	return xp;
2823 }
2824 
2825 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2826 {
2827 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2828 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2829 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2830 	       + nla_total_size(sizeof(struct xfrm_mark))
2831 	       + userpolicy_type_attrsize();
2832 }
2833 
2834 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2835 			   int dir, const struct km_event *c)
2836 {
2837 	struct xfrm_user_polexpire *upe;
2838 	int hard = c->data.hard;
2839 	struct nlmsghdr *nlh;
2840 	int err;
2841 
2842 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2843 	if (nlh == NULL)
2844 		return -EMSGSIZE;
2845 
2846 	upe = nlmsg_data(nlh);
2847 	copy_to_user_policy(xp, &upe->pol, dir);
2848 	err = copy_to_user_tmpl(xp, skb);
2849 	if (!err)
2850 		err = copy_to_user_sec_ctx(xp, skb);
2851 	if (!err)
2852 		err = copy_to_user_policy_type(xp->type, skb);
2853 	if (!err)
2854 		err = xfrm_mark_put(skb, &xp->mark);
2855 	if (err) {
2856 		nlmsg_cancel(skb, nlh);
2857 		return err;
2858 	}
2859 	upe->hard = !!hard;
2860 
2861 	nlmsg_end(skb, nlh);
2862 	return 0;
2863 }
2864 
2865 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2866 {
2867 	struct net *net = xp_net(xp);
2868 	struct sk_buff *skb;
2869 
2870 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2871 	if (skb == NULL)
2872 		return -ENOMEM;
2873 
2874 	if (build_polexpire(skb, xp, dir, c) < 0)
2875 		BUG();
2876 
2877 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2878 }
2879 
2880 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2881 {
2882 	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2883 	struct net *net = xp_net(xp);
2884 	struct xfrm_userpolicy_info *p;
2885 	struct xfrm_userpolicy_id *id;
2886 	struct nlmsghdr *nlh;
2887 	struct sk_buff *skb;
2888 	int headlen, err;
2889 
2890 	headlen = sizeof(*p);
2891 	if (c->event == XFRM_MSG_DELPOLICY) {
2892 		len += nla_total_size(headlen);
2893 		headlen = sizeof(*id);
2894 	}
2895 	len += userpolicy_type_attrsize();
2896 	len += nla_total_size(sizeof(struct xfrm_mark));
2897 	len += NLMSG_ALIGN(headlen);
2898 
2899 	skb = nlmsg_new(len, GFP_ATOMIC);
2900 	if (skb == NULL)
2901 		return -ENOMEM;
2902 
2903 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2904 	err = -EMSGSIZE;
2905 	if (nlh == NULL)
2906 		goto out_free_skb;
2907 
2908 	p = nlmsg_data(nlh);
2909 	if (c->event == XFRM_MSG_DELPOLICY) {
2910 		struct nlattr *attr;
2911 
2912 		id = nlmsg_data(nlh);
2913 		memset(id, 0, sizeof(*id));
2914 		id->dir = dir;
2915 		if (c->data.byid)
2916 			id->index = xp->index;
2917 		else
2918 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2919 
2920 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2921 		err = -EMSGSIZE;
2922 		if (attr == NULL)
2923 			goto out_free_skb;
2924 
2925 		p = nla_data(attr);
2926 	}
2927 
2928 	copy_to_user_policy(xp, p, dir);
2929 	err = copy_to_user_tmpl(xp, skb);
2930 	if (!err)
2931 		err = copy_to_user_policy_type(xp->type, skb);
2932 	if (!err)
2933 		err = xfrm_mark_put(skb, &xp->mark);
2934 	if (err)
2935 		goto out_free_skb;
2936 
2937 	nlmsg_end(skb, nlh);
2938 
2939 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2940 
2941 out_free_skb:
2942 	kfree_skb(skb);
2943 	return err;
2944 }
2945 
2946 static int xfrm_notify_policy_flush(const struct km_event *c)
2947 {
2948 	struct net *net = c->net;
2949 	struct nlmsghdr *nlh;
2950 	struct sk_buff *skb;
2951 	int err;
2952 
2953 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2954 	if (skb == NULL)
2955 		return -ENOMEM;
2956 
2957 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2958 	err = -EMSGSIZE;
2959 	if (nlh == NULL)
2960 		goto out_free_skb;
2961 	err = copy_to_user_policy_type(c->data.type, skb);
2962 	if (err)
2963 		goto out_free_skb;
2964 
2965 	nlmsg_end(skb, nlh);
2966 
2967 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2968 
2969 out_free_skb:
2970 	kfree_skb(skb);
2971 	return err;
2972 }
2973 
2974 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2975 {
2976 
2977 	switch (c->event) {
2978 	case XFRM_MSG_NEWPOLICY:
2979 	case XFRM_MSG_UPDPOLICY:
2980 	case XFRM_MSG_DELPOLICY:
2981 		return xfrm_notify_policy(xp, dir, c);
2982 	case XFRM_MSG_FLUSHPOLICY:
2983 		return xfrm_notify_policy_flush(c);
2984 	case XFRM_MSG_POLEXPIRE:
2985 		return xfrm_exp_policy_notify(xp, dir, c);
2986 	default:
2987 		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2988 		       c->event);
2989 	}
2990 
2991 	return 0;
2992 
2993 }
2994 
2995 static inline size_t xfrm_report_msgsize(void)
2996 {
2997 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2998 }
2999 
3000 static int build_report(struct sk_buff *skb, u8 proto,
3001 			struct xfrm_selector *sel, xfrm_address_t *addr)
3002 {
3003 	struct xfrm_user_report *ur;
3004 	struct nlmsghdr *nlh;
3005 
3006 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3007 	if (nlh == NULL)
3008 		return -EMSGSIZE;
3009 
3010 	ur = nlmsg_data(nlh);
3011 	ur->proto = proto;
3012 	memcpy(&ur->sel, sel, sizeof(ur->sel));
3013 
3014 	if (addr) {
3015 		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3016 		if (err) {
3017 			nlmsg_cancel(skb, nlh);
3018 			return err;
3019 		}
3020 	}
3021 	nlmsg_end(skb, nlh);
3022 	return 0;
3023 }
3024 
3025 static int xfrm_send_report(struct net *net, u8 proto,
3026 			    struct xfrm_selector *sel, xfrm_address_t *addr)
3027 {
3028 	struct sk_buff *skb;
3029 
3030 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3031 	if (skb == NULL)
3032 		return -ENOMEM;
3033 
3034 	if (build_report(skb, proto, sel, addr) < 0)
3035 		BUG();
3036 
3037 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3038 }
3039 
3040 static inline size_t xfrm_mapping_msgsize(void)
3041 {
3042 	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3043 }
3044 
3045 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3046 			 xfrm_address_t *new_saddr, __be16 new_sport)
3047 {
3048 	struct xfrm_user_mapping *um;
3049 	struct nlmsghdr *nlh;
3050 
3051 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3052 	if (nlh == NULL)
3053 		return -EMSGSIZE;
3054 
3055 	um = nlmsg_data(nlh);
3056 
3057 	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3058 	um->id.spi = x->id.spi;
3059 	um->id.family = x->props.family;
3060 	um->id.proto = x->id.proto;
3061 	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3062 	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3063 	um->new_sport = new_sport;
3064 	um->old_sport = x->encap->encap_sport;
3065 	um->reqid = x->props.reqid;
3066 
3067 	nlmsg_end(skb, nlh);
3068 	return 0;
3069 }
3070 
3071 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3072 			     __be16 sport)
3073 {
3074 	struct net *net = xs_net(x);
3075 	struct sk_buff *skb;
3076 
3077 	if (x->id.proto != IPPROTO_ESP)
3078 		return -EINVAL;
3079 
3080 	if (!x->encap)
3081 		return -EINVAL;
3082 
3083 	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3084 	if (skb == NULL)
3085 		return -ENOMEM;
3086 
3087 	if (build_mapping(skb, x, ipaddr, sport) < 0)
3088 		BUG();
3089 
3090 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3091 }
3092 
3093 static bool xfrm_is_alive(const struct km_event *c)
3094 {
3095 	return (bool)xfrm_acquire_is_on(c->net);
3096 }
3097 
3098 static struct xfrm_mgr netlink_mgr = {
3099 	.id		= "netlink",
3100 	.notify		= xfrm_send_state_notify,
3101 	.acquire	= xfrm_send_acquire,
3102 	.compile_policy	= xfrm_compile_policy,
3103 	.notify_policy	= xfrm_send_policy_notify,
3104 	.report		= xfrm_send_report,
3105 	.migrate	= xfrm_send_migrate,
3106 	.new_mapping	= xfrm_send_mapping,
3107 	.is_alive	= xfrm_is_alive,
3108 };
3109 
3110 static int __net_init xfrm_user_net_init(struct net *net)
3111 {
3112 	struct sock *nlsk;
3113 	struct netlink_kernel_cfg cfg = {
3114 		.groups	= XFRMNLGRP_MAX,
3115 		.input	= xfrm_netlink_rcv,
3116 	};
3117 
3118 	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3119 	if (nlsk == NULL)
3120 		return -ENOMEM;
3121 	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3122 	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3123 	return 0;
3124 }
3125 
3126 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3127 {
3128 	struct net *net;
3129 	list_for_each_entry(net, net_exit_list, exit_list)
3130 		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3131 	synchronize_net();
3132 	list_for_each_entry(net, net_exit_list, exit_list)
3133 		netlink_kernel_release(net->xfrm.nlsk_stash);
3134 }
3135 
3136 static struct pernet_operations xfrm_user_net_ops = {
3137 	.init	    = xfrm_user_net_init,
3138 	.exit_batch = xfrm_user_net_exit,
3139 };
3140 
3141 static int __init xfrm_user_init(void)
3142 {
3143 	int rv;
3144 
3145 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3146 
3147 	rv = register_pernet_subsys(&xfrm_user_net_ops);
3148 	if (rv < 0)
3149 		return rv;
3150 	rv = xfrm_register_km(&netlink_mgr);
3151 	if (rv < 0)
3152 		unregister_pernet_subsys(&xfrm_user_net_ops);
3153 	return rv;
3154 }
3155 
3156 static void __exit xfrm_user_exit(void)
3157 {
3158 	xfrm_unregister_km(&netlink_mgr);
3159 	unregister_pernet_subsys(&xfrm_user_net_ops);
3160 }
3161 
3162 module_init(xfrm_user_init);
3163 module_exit(xfrm_user_exit);
3164 MODULE_LICENSE("GPL");
3165 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3166 
3167