xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision e8f6f3b4)
1 /* xfrm_user.c: User interface to configure xfrm engine.
2  *
3  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4  *
5  * Changes:
6  *	Mitsuru KANDA @USAGI
7  * 	Kazunori MIYAZAWA @USAGI
8  * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9  * 		IPv6 support
10  *
11  */
12 
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 
35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
36 {
37 	struct nlattr *rt = attrs[type];
38 	struct xfrm_algo *algp;
39 
40 	if (!rt)
41 		return 0;
42 
43 	algp = nla_data(rt);
44 	if (nla_len(rt) < xfrm_alg_len(algp))
45 		return -EINVAL;
46 
47 	switch (type) {
48 	case XFRMA_ALG_AUTH:
49 	case XFRMA_ALG_CRYPT:
50 	case XFRMA_ALG_COMP:
51 		break;
52 
53 	default:
54 		return -EINVAL;
55 	}
56 
57 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 	return 0;
59 }
60 
61 static int verify_auth_trunc(struct nlattr **attrs)
62 {
63 	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 	struct xfrm_algo_auth *algp;
65 
66 	if (!rt)
67 		return 0;
68 
69 	algp = nla_data(rt);
70 	if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 		return -EINVAL;
72 
73 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 	return 0;
75 }
76 
77 static int verify_aead(struct nlattr **attrs)
78 {
79 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 	struct xfrm_algo_aead *algp;
81 
82 	if (!rt)
83 		return 0;
84 
85 	algp = nla_data(rt);
86 	if (nla_len(rt) < aead_len(algp))
87 		return -EINVAL;
88 
89 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 	return 0;
91 }
92 
93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 			   xfrm_address_t **addrp)
95 {
96 	struct nlattr *rt = attrs[type];
97 
98 	if (rt && addrp)
99 		*addrp = nla_data(rt);
100 }
101 
102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
103 {
104 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 	struct xfrm_user_sec_ctx *uctx;
106 
107 	if (!rt)
108 		return 0;
109 
110 	uctx = nla_data(rt);
111 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112 		return -EINVAL;
113 
114 	return 0;
115 }
116 
117 static inline int verify_replay(struct xfrm_usersa_info *p,
118 				struct nlattr **attrs)
119 {
120 	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 	struct xfrm_replay_state_esn *rs;
122 
123 	if (p->flags & XFRM_STATE_ESN) {
124 		if (!rt)
125 			return -EINVAL;
126 
127 		rs = nla_data(rt);
128 
129 		if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 			return -EINVAL;
131 
132 		if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 		    nla_len(rt) != sizeof(*rs))
134 			return -EINVAL;
135 	}
136 
137 	if (!rt)
138 		return 0;
139 
140 	/* As only ESP and AH support ESN feature. */
141 	if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142 		return -EINVAL;
143 
144 	if (p->replay_window != 0)
145 		return -EINVAL;
146 
147 	return 0;
148 }
149 
150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151 			     struct nlattr **attrs)
152 {
153 	int err;
154 
155 	err = -EINVAL;
156 	switch (p->family) {
157 	case AF_INET:
158 		break;
159 
160 	case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162 		break;
163 #else
164 		err = -EAFNOSUPPORT;
165 		goto out;
166 #endif
167 
168 	default:
169 		goto out;
170 	}
171 
172 	err = -EINVAL;
173 	switch (p->id.proto) {
174 	case IPPROTO_AH:
175 		if ((!attrs[XFRMA_ALG_AUTH]	&&
176 		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 		    attrs[XFRMA_ALG_AEAD]	||
178 		    attrs[XFRMA_ALG_CRYPT]	||
179 		    attrs[XFRMA_ALG_COMP]	||
180 		    attrs[XFRMA_TFCPAD])
181 			goto out;
182 		break;
183 
184 	case IPPROTO_ESP:
185 		if (attrs[XFRMA_ALG_COMP])
186 			goto out;
187 		if (!attrs[XFRMA_ALG_AUTH] &&
188 		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189 		    !attrs[XFRMA_ALG_CRYPT] &&
190 		    !attrs[XFRMA_ALG_AEAD])
191 			goto out;
192 		if ((attrs[XFRMA_ALG_AUTH] ||
193 		     attrs[XFRMA_ALG_AUTH_TRUNC] ||
194 		     attrs[XFRMA_ALG_CRYPT]) &&
195 		    attrs[XFRMA_ALG_AEAD])
196 			goto out;
197 		if (attrs[XFRMA_TFCPAD] &&
198 		    p->mode != XFRM_MODE_TUNNEL)
199 			goto out;
200 		break;
201 
202 	case IPPROTO_COMP:
203 		if (!attrs[XFRMA_ALG_COMP]	||
204 		    attrs[XFRMA_ALG_AEAD]	||
205 		    attrs[XFRMA_ALG_AUTH]	||
206 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
207 		    attrs[XFRMA_ALG_CRYPT]	||
208 		    attrs[XFRMA_TFCPAD]		||
209 		    (ntohl(p->id.spi) >= 0x10000))
210 			goto out;
211 		break;
212 
213 #if IS_ENABLED(CONFIG_IPV6)
214 	case IPPROTO_DSTOPTS:
215 	case IPPROTO_ROUTING:
216 		if (attrs[XFRMA_ALG_COMP]	||
217 		    attrs[XFRMA_ALG_AUTH]	||
218 		    attrs[XFRMA_ALG_AUTH_TRUNC]	||
219 		    attrs[XFRMA_ALG_AEAD]	||
220 		    attrs[XFRMA_ALG_CRYPT]	||
221 		    attrs[XFRMA_ENCAP]		||
222 		    attrs[XFRMA_SEC_CTX]	||
223 		    attrs[XFRMA_TFCPAD]		||
224 		    !attrs[XFRMA_COADDR])
225 			goto out;
226 		break;
227 #endif
228 
229 	default:
230 		goto out;
231 	}
232 
233 	if ((err = verify_aead(attrs)))
234 		goto out;
235 	if ((err = verify_auth_trunc(attrs)))
236 		goto out;
237 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
238 		goto out;
239 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
240 		goto out;
241 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
242 		goto out;
243 	if ((err = verify_sec_ctx_len(attrs)))
244 		goto out;
245 	if ((err = verify_replay(p, attrs)))
246 		goto out;
247 
248 	err = -EINVAL;
249 	switch (p->mode) {
250 	case XFRM_MODE_TRANSPORT:
251 	case XFRM_MODE_TUNNEL:
252 	case XFRM_MODE_ROUTEOPTIMIZATION:
253 	case XFRM_MODE_BEET:
254 		break;
255 
256 	default:
257 		goto out;
258 	}
259 
260 	err = 0;
261 
262 out:
263 	return err;
264 }
265 
266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267 			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
268 			   struct nlattr *rta)
269 {
270 	struct xfrm_algo *p, *ualg;
271 	struct xfrm_algo_desc *algo;
272 
273 	if (!rta)
274 		return 0;
275 
276 	ualg = nla_data(rta);
277 
278 	algo = get_byname(ualg->alg_name, 1);
279 	if (!algo)
280 		return -ENOSYS;
281 	*props = algo->desc.sadb_alg_id;
282 
283 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
284 	if (!p)
285 		return -ENOMEM;
286 
287 	strcpy(p->alg_name, algo->name);
288 	*algpp = p;
289 	return 0;
290 }
291 
292 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
293 		       struct nlattr *rta)
294 {
295 	struct xfrm_algo *ualg;
296 	struct xfrm_algo_auth *p;
297 	struct xfrm_algo_desc *algo;
298 
299 	if (!rta)
300 		return 0;
301 
302 	ualg = nla_data(rta);
303 
304 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
305 	if (!algo)
306 		return -ENOSYS;
307 	*props = algo->desc.sadb_alg_id;
308 
309 	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
310 	if (!p)
311 		return -ENOMEM;
312 
313 	strcpy(p->alg_name, algo->name);
314 	p->alg_key_len = ualg->alg_key_len;
315 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
316 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
317 
318 	*algpp = p;
319 	return 0;
320 }
321 
322 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
323 			     struct nlattr *rta)
324 {
325 	struct xfrm_algo_auth *p, *ualg;
326 	struct xfrm_algo_desc *algo;
327 
328 	if (!rta)
329 		return 0;
330 
331 	ualg = nla_data(rta);
332 
333 	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
334 	if (!algo)
335 		return -ENOSYS;
336 	if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
337 		return -EINVAL;
338 	*props = algo->desc.sadb_alg_id;
339 
340 	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
341 	if (!p)
342 		return -ENOMEM;
343 
344 	strcpy(p->alg_name, algo->name);
345 	if (!p->alg_trunc_len)
346 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
347 
348 	*algpp = p;
349 	return 0;
350 }
351 
352 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
353 		       struct nlattr *rta)
354 {
355 	struct xfrm_algo_aead *p, *ualg;
356 	struct xfrm_algo_desc *algo;
357 
358 	if (!rta)
359 		return 0;
360 
361 	ualg = nla_data(rta);
362 
363 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
364 	if (!algo)
365 		return -ENOSYS;
366 	*props = algo->desc.sadb_alg_id;
367 
368 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
369 	if (!p)
370 		return -ENOMEM;
371 
372 	strcpy(p->alg_name, algo->name);
373 	*algpp = p;
374 	return 0;
375 }
376 
377 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
378 					 struct nlattr *rp)
379 {
380 	struct xfrm_replay_state_esn *up;
381 	int ulen;
382 
383 	if (!replay_esn || !rp)
384 		return 0;
385 
386 	up = nla_data(rp);
387 	ulen = xfrm_replay_state_esn_len(up);
388 
389 	if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
390 		return -EINVAL;
391 
392 	return 0;
393 }
394 
395 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
396 				       struct xfrm_replay_state_esn **preplay_esn,
397 				       struct nlattr *rta)
398 {
399 	struct xfrm_replay_state_esn *p, *pp, *up;
400 	int klen, ulen;
401 
402 	if (!rta)
403 		return 0;
404 
405 	up = nla_data(rta);
406 	klen = xfrm_replay_state_esn_len(up);
407 	ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
408 
409 	p = kzalloc(klen, GFP_KERNEL);
410 	if (!p)
411 		return -ENOMEM;
412 
413 	pp = kzalloc(klen, GFP_KERNEL);
414 	if (!pp) {
415 		kfree(p);
416 		return -ENOMEM;
417 	}
418 
419 	memcpy(p, up, ulen);
420 	memcpy(pp, up, ulen);
421 
422 	*replay_esn = p;
423 	*preplay_esn = pp;
424 
425 	return 0;
426 }
427 
428 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
429 {
430 	int len = 0;
431 
432 	if (xfrm_ctx) {
433 		len += sizeof(struct xfrm_user_sec_ctx);
434 		len += xfrm_ctx->ctx_len;
435 	}
436 	return len;
437 }
438 
439 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
440 {
441 	memcpy(&x->id, &p->id, sizeof(x->id));
442 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
443 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
444 	x->props.mode = p->mode;
445 	x->props.replay_window = min_t(unsigned int, p->replay_window,
446 					sizeof(x->replay.bitmap) * 8);
447 	x->props.reqid = p->reqid;
448 	x->props.family = p->family;
449 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
450 	x->props.flags = p->flags;
451 
452 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
453 		x->sel.family = p->family;
454 }
455 
456 /*
457  * someday when pfkey also has support, we could have the code
458  * somehow made shareable and move it to xfrm_state.c - JHS
459  *
460 */
461 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
462 				  int update_esn)
463 {
464 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
465 	struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
466 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
467 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
468 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
469 
470 	if (re) {
471 		struct xfrm_replay_state_esn *replay_esn;
472 		replay_esn = nla_data(re);
473 		memcpy(x->replay_esn, replay_esn,
474 		       xfrm_replay_state_esn_len(replay_esn));
475 		memcpy(x->preplay_esn, replay_esn,
476 		       xfrm_replay_state_esn_len(replay_esn));
477 	}
478 
479 	if (rp) {
480 		struct xfrm_replay_state *replay;
481 		replay = nla_data(rp);
482 		memcpy(&x->replay, replay, sizeof(*replay));
483 		memcpy(&x->preplay, replay, sizeof(*replay));
484 	}
485 
486 	if (lt) {
487 		struct xfrm_lifetime_cur *ltime;
488 		ltime = nla_data(lt);
489 		x->curlft.bytes = ltime->bytes;
490 		x->curlft.packets = ltime->packets;
491 		x->curlft.add_time = ltime->add_time;
492 		x->curlft.use_time = ltime->use_time;
493 	}
494 
495 	if (et)
496 		x->replay_maxage = nla_get_u32(et);
497 
498 	if (rt)
499 		x->replay_maxdiff = nla_get_u32(rt);
500 }
501 
502 static struct xfrm_state *xfrm_state_construct(struct net *net,
503 					       struct xfrm_usersa_info *p,
504 					       struct nlattr **attrs,
505 					       int *errp)
506 {
507 	struct xfrm_state *x = xfrm_state_alloc(net);
508 	int err = -ENOMEM;
509 
510 	if (!x)
511 		goto error_no_put;
512 
513 	copy_from_user_state(x, p);
514 
515 	if (attrs[XFRMA_SA_EXTRA_FLAGS])
516 		x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
517 
518 	if ((err = attach_aead(&x->aead, &x->props.ealgo,
519 			       attrs[XFRMA_ALG_AEAD])))
520 		goto error;
521 	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
522 				     attrs[XFRMA_ALG_AUTH_TRUNC])))
523 		goto error;
524 	if (!x->props.aalgo) {
525 		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
526 				       attrs[XFRMA_ALG_AUTH])))
527 			goto error;
528 	}
529 	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
530 				   xfrm_ealg_get_byname,
531 				   attrs[XFRMA_ALG_CRYPT])))
532 		goto error;
533 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
534 				   xfrm_calg_get_byname,
535 				   attrs[XFRMA_ALG_COMP])))
536 		goto error;
537 
538 	if (attrs[XFRMA_ENCAP]) {
539 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
540 				   sizeof(*x->encap), GFP_KERNEL);
541 		if (x->encap == NULL)
542 			goto error;
543 	}
544 
545 	if (attrs[XFRMA_TFCPAD])
546 		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
547 
548 	if (attrs[XFRMA_COADDR]) {
549 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
550 				    sizeof(*x->coaddr), GFP_KERNEL);
551 		if (x->coaddr == NULL)
552 			goto error;
553 	}
554 
555 	xfrm_mark_get(attrs, &x->mark);
556 
557 	err = __xfrm_init_state(x, false);
558 	if (err)
559 		goto error;
560 
561 	if (attrs[XFRMA_SEC_CTX] &&
562 	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
563 		goto error;
564 
565 	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
566 					       attrs[XFRMA_REPLAY_ESN_VAL])))
567 		goto error;
568 
569 	x->km.seq = p->seq;
570 	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
571 	/* sysctl_xfrm_aevent_etime is in 100ms units */
572 	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
573 
574 	if ((err = xfrm_init_replay(x)))
575 		goto error;
576 
577 	/* override default values from above */
578 	xfrm_update_ae_params(x, attrs, 0);
579 
580 	return x;
581 
582 error:
583 	x->km.state = XFRM_STATE_DEAD;
584 	xfrm_state_put(x);
585 error_no_put:
586 	*errp = err;
587 	return NULL;
588 }
589 
590 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
591 		struct nlattr **attrs)
592 {
593 	struct net *net = sock_net(skb->sk);
594 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
595 	struct xfrm_state *x;
596 	int err;
597 	struct km_event c;
598 
599 	err = verify_newsa_info(p, attrs);
600 	if (err)
601 		return err;
602 
603 	x = xfrm_state_construct(net, p, attrs, &err);
604 	if (!x)
605 		return err;
606 
607 	xfrm_state_hold(x);
608 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
609 		err = xfrm_state_add(x);
610 	else
611 		err = xfrm_state_update(x);
612 
613 	xfrm_audit_state_add(x, err ? 0 : 1, true);
614 
615 	if (err < 0) {
616 		x->km.state = XFRM_STATE_DEAD;
617 		__xfrm_state_put(x);
618 		goto out;
619 	}
620 
621 	c.seq = nlh->nlmsg_seq;
622 	c.portid = nlh->nlmsg_pid;
623 	c.event = nlh->nlmsg_type;
624 
625 	km_state_notify(x, &c);
626 out:
627 	xfrm_state_put(x);
628 	return err;
629 }
630 
631 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
632 						 struct xfrm_usersa_id *p,
633 						 struct nlattr **attrs,
634 						 int *errp)
635 {
636 	struct xfrm_state *x = NULL;
637 	struct xfrm_mark m;
638 	int err;
639 	u32 mark = xfrm_mark_get(attrs, &m);
640 
641 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
642 		err = -ESRCH;
643 		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
644 	} else {
645 		xfrm_address_t *saddr = NULL;
646 
647 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
648 		if (!saddr) {
649 			err = -EINVAL;
650 			goto out;
651 		}
652 
653 		err = -ESRCH;
654 		x = xfrm_state_lookup_byaddr(net, mark,
655 					     &p->daddr, saddr,
656 					     p->proto, p->family);
657 	}
658 
659  out:
660 	if (!x && errp)
661 		*errp = err;
662 	return x;
663 }
664 
665 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
666 		struct nlattr **attrs)
667 {
668 	struct net *net = sock_net(skb->sk);
669 	struct xfrm_state *x;
670 	int err = -ESRCH;
671 	struct km_event c;
672 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
673 
674 	x = xfrm_user_state_lookup(net, p, attrs, &err);
675 	if (x == NULL)
676 		return err;
677 
678 	if ((err = security_xfrm_state_delete(x)) != 0)
679 		goto out;
680 
681 	if (xfrm_state_kern(x)) {
682 		err = -EPERM;
683 		goto out;
684 	}
685 
686 	err = xfrm_state_delete(x);
687 
688 	if (err < 0)
689 		goto out;
690 
691 	c.seq = nlh->nlmsg_seq;
692 	c.portid = nlh->nlmsg_pid;
693 	c.event = nlh->nlmsg_type;
694 	km_state_notify(x, &c);
695 
696 out:
697 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
698 	xfrm_state_put(x);
699 	return err;
700 }
701 
702 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
703 {
704 	memset(p, 0, sizeof(*p));
705 	memcpy(&p->id, &x->id, sizeof(p->id));
706 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
707 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
708 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
709 	memcpy(&p->stats, &x->stats, sizeof(p->stats));
710 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
711 	p->mode = x->props.mode;
712 	p->replay_window = x->props.replay_window;
713 	p->reqid = x->props.reqid;
714 	p->family = x->props.family;
715 	p->flags = x->props.flags;
716 	p->seq = x->km.seq;
717 }
718 
719 struct xfrm_dump_info {
720 	struct sk_buff *in_skb;
721 	struct sk_buff *out_skb;
722 	u32 nlmsg_seq;
723 	u16 nlmsg_flags;
724 };
725 
726 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
727 {
728 	struct xfrm_user_sec_ctx *uctx;
729 	struct nlattr *attr;
730 	int ctx_size = sizeof(*uctx) + s->ctx_len;
731 
732 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
733 	if (attr == NULL)
734 		return -EMSGSIZE;
735 
736 	uctx = nla_data(attr);
737 	uctx->exttype = XFRMA_SEC_CTX;
738 	uctx->len = ctx_size;
739 	uctx->ctx_doi = s->ctx_doi;
740 	uctx->ctx_alg = s->ctx_alg;
741 	uctx->ctx_len = s->ctx_len;
742 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
743 
744 	return 0;
745 }
746 
747 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
748 {
749 	struct xfrm_algo *algo;
750 	struct nlattr *nla;
751 
752 	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
753 			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
754 	if (!nla)
755 		return -EMSGSIZE;
756 
757 	algo = nla_data(nla);
758 	strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
759 	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
760 	algo->alg_key_len = auth->alg_key_len;
761 
762 	return 0;
763 }
764 
765 /* Don't change this without updating xfrm_sa_len! */
766 static int copy_to_user_state_extra(struct xfrm_state *x,
767 				    struct xfrm_usersa_info *p,
768 				    struct sk_buff *skb)
769 {
770 	int ret = 0;
771 
772 	copy_to_user_state(x, p);
773 
774 	if (x->props.extra_flags) {
775 		ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
776 				  x->props.extra_flags);
777 		if (ret)
778 			goto out;
779 	}
780 
781 	if (x->coaddr) {
782 		ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
783 		if (ret)
784 			goto out;
785 	}
786 	if (x->lastused) {
787 		ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
788 		if (ret)
789 			goto out;
790 	}
791 	if (x->aead) {
792 		ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
793 		if (ret)
794 			goto out;
795 	}
796 	if (x->aalg) {
797 		ret = copy_to_user_auth(x->aalg, skb);
798 		if (!ret)
799 			ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
800 				      xfrm_alg_auth_len(x->aalg), x->aalg);
801 		if (ret)
802 			goto out;
803 	}
804 	if (x->ealg) {
805 		ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
806 		if (ret)
807 			goto out;
808 	}
809 	if (x->calg) {
810 		ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
811 		if (ret)
812 			goto out;
813 	}
814 	if (x->encap) {
815 		ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
816 		if (ret)
817 			goto out;
818 	}
819 	if (x->tfcpad) {
820 		ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
821 		if (ret)
822 			goto out;
823 	}
824 	ret = xfrm_mark_put(skb, &x->mark);
825 	if (ret)
826 		goto out;
827 	if (x->replay_esn)
828 		ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
829 			      xfrm_replay_state_esn_len(x->replay_esn),
830 			      x->replay_esn);
831 	else
832 		ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
833 			      &x->replay);
834 	if (ret)
835 		goto out;
836 	if (x->security)
837 		ret = copy_sec_ctx(x->security, skb);
838 out:
839 	return ret;
840 }
841 
842 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
843 {
844 	struct xfrm_dump_info *sp = ptr;
845 	struct sk_buff *in_skb = sp->in_skb;
846 	struct sk_buff *skb = sp->out_skb;
847 	struct xfrm_usersa_info *p;
848 	struct nlmsghdr *nlh;
849 	int err;
850 
851 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
852 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
853 	if (nlh == NULL)
854 		return -EMSGSIZE;
855 
856 	p = nlmsg_data(nlh);
857 
858 	err = copy_to_user_state_extra(x, p, skb);
859 	if (err) {
860 		nlmsg_cancel(skb, nlh);
861 		return err;
862 	}
863 	nlmsg_end(skb, nlh);
864 	return 0;
865 }
866 
867 static int xfrm_dump_sa_done(struct netlink_callback *cb)
868 {
869 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
870 	struct sock *sk = cb->skb->sk;
871 	struct net *net = sock_net(sk);
872 
873 	xfrm_state_walk_done(walk, net);
874 	return 0;
875 }
876 
877 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
878 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
879 {
880 	struct net *net = sock_net(skb->sk);
881 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
882 	struct xfrm_dump_info info;
883 
884 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
885 		     sizeof(cb->args) - sizeof(cb->args[0]));
886 
887 	info.in_skb = cb->skb;
888 	info.out_skb = skb;
889 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
890 	info.nlmsg_flags = NLM_F_MULTI;
891 
892 	if (!cb->args[0]) {
893 		struct nlattr *attrs[XFRMA_MAX+1];
894 		struct xfrm_address_filter *filter = NULL;
895 		u8 proto = 0;
896 		int err;
897 
898 		cb->args[0] = 1;
899 
900 		err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
901 				  xfrma_policy);
902 		if (err < 0)
903 			return err;
904 
905 		if (attrs[XFRMA_ADDRESS_FILTER]) {
906 			filter = kmalloc(sizeof(*filter), GFP_KERNEL);
907 			if (filter == NULL)
908 				return -ENOMEM;
909 
910 			memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
911 			       sizeof(*filter));
912 		}
913 
914 		if (attrs[XFRMA_PROTO])
915 			proto = nla_get_u8(attrs[XFRMA_PROTO]);
916 
917 		xfrm_state_walk_init(walk, proto, filter);
918 	}
919 
920 	(void) xfrm_state_walk(net, walk, dump_one_state, &info);
921 
922 	return skb->len;
923 }
924 
925 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
926 					  struct xfrm_state *x, u32 seq)
927 {
928 	struct xfrm_dump_info info;
929 	struct sk_buff *skb;
930 	int err;
931 
932 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
933 	if (!skb)
934 		return ERR_PTR(-ENOMEM);
935 
936 	info.in_skb = in_skb;
937 	info.out_skb = skb;
938 	info.nlmsg_seq = seq;
939 	info.nlmsg_flags = 0;
940 
941 	err = dump_one_state(x, 0, &info);
942 	if (err) {
943 		kfree_skb(skb);
944 		return ERR_PTR(err);
945 	}
946 
947 	return skb;
948 }
949 
950 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
951  * Must be called with RCU read lock.
952  */
953 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
954 				       u32 pid, unsigned int group)
955 {
956 	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
957 
958 	if (nlsk)
959 		return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
960 	else
961 		return -1;
962 }
963 
964 static inline size_t xfrm_spdinfo_msgsize(void)
965 {
966 	return NLMSG_ALIGN(4)
967 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
968 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo))
969 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh))
970 	       + nla_total_size(sizeof(struct xfrmu_spdhthresh));
971 }
972 
973 static int build_spdinfo(struct sk_buff *skb, struct net *net,
974 			 u32 portid, u32 seq, u32 flags)
975 {
976 	struct xfrmk_spdinfo si;
977 	struct xfrmu_spdinfo spc;
978 	struct xfrmu_spdhinfo sph;
979 	struct xfrmu_spdhthresh spt4, spt6;
980 	struct nlmsghdr *nlh;
981 	int err;
982 	u32 *f;
983 	unsigned lseq;
984 
985 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
986 	if (nlh == NULL) /* shouldn't really happen ... */
987 		return -EMSGSIZE;
988 
989 	f = nlmsg_data(nlh);
990 	*f = flags;
991 	xfrm_spd_getinfo(net, &si);
992 	spc.incnt = si.incnt;
993 	spc.outcnt = si.outcnt;
994 	spc.fwdcnt = si.fwdcnt;
995 	spc.inscnt = si.inscnt;
996 	spc.outscnt = si.outscnt;
997 	spc.fwdscnt = si.fwdscnt;
998 	sph.spdhcnt = si.spdhcnt;
999 	sph.spdhmcnt = si.spdhmcnt;
1000 
1001 	do {
1002 		lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1003 
1004 		spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1005 		spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1006 		spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1007 		spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1008 	} while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1009 
1010 	err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1011 	if (!err)
1012 		err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1013 	if (!err)
1014 		err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1015 	if (!err)
1016 		err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1017 	if (err) {
1018 		nlmsg_cancel(skb, nlh);
1019 		return err;
1020 	}
1021 
1022 	return nlmsg_end(skb, nlh);
1023 }
1024 
1025 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1026 			    struct nlattr **attrs)
1027 {
1028 	struct net *net = sock_net(skb->sk);
1029 	struct xfrmu_spdhthresh *thresh4 = NULL;
1030 	struct xfrmu_spdhthresh *thresh6 = NULL;
1031 
1032 	/* selector prefixlen thresholds to hash policies */
1033 	if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1034 		struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1035 
1036 		if (nla_len(rta) < sizeof(*thresh4))
1037 			return -EINVAL;
1038 		thresh4 = nla_data(rta);
1039 		if (thresh4->lbits > 32 || thresh4->rbits > 32)
1040 			return -EINVAL;
1041 	}
1042 	if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1043 		struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1044 
1045 		if (nla_len(rta) < sizeof(*thresh6))
1046 			return -EINVAL;
1047 		thresh6 = nla_data(rta);
1048 		if (thresh6->lbits > 128 || thresh6->rbits > 128)
1049 			return -EINVAL;
1050 	}
1051 
1052 	if (thresh4 || thresh6) {
1053 		write_seqlock(&net->xfrm.policy_hthresh.lock);
1054 		if (thresh4) {
1055 			net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1056 			net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1057 		}
1058 		if (thresh6) {
1059 			net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1060 			net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1061 		}
1062 		write_sequnlock(&net->xfrm.policy_hthresh.lock);
1063 
1064 		xfrm_policy_hash_rebuild(net);
1065 	}
1066 
1067 	return 0;
1068 }
1069 
1070 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1071 		struct nlattr **attrs)
1072 {
1073 	struct net *net = sock_net(skb->sk);
1074 	struct sk_buff *r_skb;
1075 	u32 *flags = nlmsg_data(nlh);
1076 	u32 sportid = NETLINK_CB(skb).portid;
1077 	u32 seq = nlh->nlmsg_seq;
1078 
1079 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1080 	if (r_skb == NULL)
1081 		return -ENOMEM;
1082 
1083 	if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1084 		BUG();
1085 
1086 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1087 }
1088 
1089 static inline size_t xfrm_sadinfo_msgsize(void)
1090 {
1091 	return NLMSG_ALIGN(4)
1092 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1093 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
1094 }
1095 
1096 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1097 			 u32 portid, u32 seq, u32 flags)
1098 {
1099 	struct xfrmk_sadinfo si;
1100 	struct xfrmu_sadhinfo sh;
1101 	struct nlmsghdr *nlh;
1102 	int err;
1103 	u32 *f;
1104 
1105 	nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1106 	if (nlh == NULL) /* shouldn't really happen ... */
1107 		return -EMSGSIZE;
1108 
1109 	f = nlmsg_data(nlh);
1110 	*f = flags;
1111 	xfrm_sad_getinfo(net, &si);
1112 
1113 	sh.sadhmcnt = si.sadhmcnt;
1114 	sh.sadhcnt = si.sadhcnt;
1115 
1116 	err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1117 	if (!err)
1118 		err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1119 	if (err) {
1120 		nlmsg_cancel(skb, nlh);
1121 		return err;
1122 	}
1123 
1124 	return nlmsg_end(skb, nlh);
1125 }
1126 
1127 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1128 		struct nlattr **attrs)
1129 {
1130 	struct net *net = sock_net(skb->sk);
1131 	struct sk_buff *r_skb;
1132 	u32 *flags = nlmsg_data(nlh);
1133 	u32 sportid = NETLINK_CB(skb).portid;
1134 	u32 seq = nlh->nlmsg_seq;
1135 
1136 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1137 	if (r_skb == NULL)
1138 		return -ENOMEM;
1139 
1140 	if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1141 		BUG();
1142 
1143 	return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1144 }
1145 
1146 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1147 		struct nlattr **attrs)
1148 {
1149 	struct net *net = sock_net(skb->sk);
1150 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
1151 	struct xfrm_state *x;
1152 	struct sk_buff *resp_skb;
1153 	int err = -ESRCH;
1154 
1155 	x = xfrm_user_state_lookup(net, p, attrs, &err);
1156 	if (x == NULL)
1157 		goto out_noput;
1158 
1159 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1160 	if (IS_ERR(resp_skb)) {
1161 		err = PTR_ERR(resp_skb);
1162 	} else {
1163 		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1164 	}
1165 	xfrm_state_put(x);
1166 out_noput:
1167 	return err;
1168 }
1169 
1170 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1171 		struct nlattr **attrs)
1172 {
1173 	struct net *net = sock_net(skb->sk);
1174 	struct xfrm_state *x;
1175 	struct xfrm_userspi_info *p;
1176 	struct sk_buff *resp_skb;
1177 	xfrm_address_t *daddr;
1178 	int family;
1179 	int err;
1180 	u32 mark;
1181 	struct xfrm_mark m;
1182 
1183 	p = nlmsg_data(nlh);
1184 	err = verify_spi_info(p->info.id.proto, p->min, p->max);
1185 	if (err)
1186 		goto out_noput;
1187 
1188 	family = p->info.family;
1189 	daddr = &p->info.id.daddr;
1190 
1191 	x = NULL;
1192 
1193 	mark = xfrm_mark_get(attrs, &m);
1194 	if (p->info.seq) {
1195 		x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1196 		if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1197 			xfrm_state_put(x);
1198 			x = NULL;
1199 		}
1200 	}
1201 
1202 	if (!x)
1203 		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1204 				  p->info.id.proto, daddr,
1205 				  &p->info.saddr, 1,
1206 				  family);
1207 	err = -ENOENT;
1208 	if (x == NULL)
1209 		goto out_noput;
1210 
1211 	err = xfrm_alloc_spi(x, p->min, p->max);
1212 	if (err)
1213 		goto out;
1214 
1215 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1216 	if (IS_ERR(resp_skb)) {
1217 		err = PTR_ERR(resp_skb);
1218 		goto out;
1219 	}
1220 
1221 	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1222 
1223 out:
1224 	xfrm_state_put(x);
1225 out_noput:
1226 	return err;
1227 }
1228 
1229 static int verify_policy_dir(u8 dir)
1230 {
1231 	switch (dir) {
1232 	case XFRM_POLICY_IN:
1233 	case XFRM_POLICY_OUT:
1234 	case XFRM_POLICY_FWD:
1235 		break;
1236 
1237 	default:
1238 		return -EINVAL;
1239 	}
1240 
1241 	return 0;
1242 }
1243 
1244 static int verify_policy_type(u8 type)
1245 {
1246 	switch (type) {
1247 	case XFRM_POLICY_TYPE_MAIN:
1248 #ifdef CONFIG_XFRM_SUB_POLICY
1249 	case XFRM_POLICY_TYPE_SUB:
1250 #endif
1251 		break;
1252 
1253 	default:
1254 		return -EINVAL;
1255 	}
1256 
1257 	return 0;
1258 }
1259 
1260 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1261 {
1262 	int ret;
1263 
1264 	switch (p->share) {
1265 	case XFRM_SHARE_ANY:
1266 	case XFRM_SHARE_SESSION:
1267 	case XFRM_SHARE_USER:
1268 	case XFRM_SHARE_UNIQUE:
1269 		break;
1270 
1271 	default:
1272 		return -EINVAL;
1273 	}
1274 
1275 	switch (p->action) {
1276 	case XFRM_POLICY_ALLOW:
1277 	case XFRM_POLICY_BLOCK:
1278 		break;
1279 
1280 	default:
1281 		return -EINVAL;
1282 	}
1283 
1284 	switch (p->sel.family) {
1285 	case AF_INET:
1286 		break;
1287 
1288 	case AF_INET6:
1289 #if IS_ENABLED(CONFIG_IPV6)
1290 		break;
1291 #else
1292 		return  -EAFNOSUPPORT;
1293 #endif
1294 
1295 	default:
1296 		return -EINVAL;
1297 	}
1298 
1299 	ret = verify_policy_dir(p->dir);
1300 	if (ret)
1301 		return ret;
1302 	if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1303 		return -EINVAL;
1304 
1305 	return 0;
1306 }
1307 
1308 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1309 {
1310 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1311 	struct xfrm_user_sec_ctx *uctx;
1312 
1313 	if (!rt)
1314 		return 0;
1315 
1316 	uctx = nla_data(rt);
1317 	return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1318 }
1319 
1320 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1321 			   int nr)
1322 {
1323 	int i;
1324 
1325 	xp->xfrm_nr = nr;
1326 	for (i = 0; i < nr; i++, ut++) {
1327 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1328 
1329 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1330 		memcpy(&t->saddr, &ut->saddr,
1331 		       sizeof(xfrm_address_t));
1332 		t->reqid = ut->reqid;
1333 		t->mode = ut->mode;
1334 		t->share = ut->share;
1335 		t->optional = ut->optional;
1336 		t->aalgos = ut->aalgos;
1337 		t->ealgos = ut->ealgos;
1338 		t->calgos = ut->calgos;
1339 		/* If all masks are ~0, then we allow all algorithms. */
1340 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1341 		t->encap_family = ut->family;
1342 	}
1343 }
1344 
1345 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1346 {
1347 	int i;
1348 
1349 	if (nr > XFRM_MAX_DEPTH)
1350 		return -EINVAL;
1351 
1352 	for (i = 0; i < nr; i++) {
1353 		/* We never validated the ut->family value, so many
1354 		 * applications simply leave it at zero.  The check was
1355 		 * never made and ut->family was ignored because all
1356 		 * templates could be assumed to have the same family as
1357 		 * the policy itself.  Now that we will have ipv4-in-ipv6
1358 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
1359 		 */
1360 		if (!ut[i].family)
1361 			ut[i].family = family;
1362 
1363 		switch (ut[i].family) {
1364 		case AF_INET:
1365 			break;
1366 #if IS_ENABLED(CONFIG_IPV6)
1367 		case AF_INET6:
1368 			break;
1369 #endif
1370 		default:
1371 			return -EINVAL;
1372 		}
1373 	}
1374 
1375 	return 0;
1376 }
1377 
1378 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1379 {
1380 	struct nlattr *rt = attrs[XFRMA_TMPL];
1381 
1382 	if (!rt) {
1383 		pol->xfrm_nr = 0;
1384 	} else {
1385 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1386 		int nr = nla_len(rt) / sizeof(*utmpl);
1387 		int err;
1388 
1389 		err = validate_tmpl(nr, utmpl, pol->family);
1390 		if (err)
1391 			return err;
1392 
1393 		copy_templates(pol, utmpl, nr);
1394 	}
1395 	return 0;
1396 }
1397 
1398 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1399 {
1400 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1401 	struct xfrm_userpolicy_type *upt;
1402 	u8 type = XFRM_POLICY_TYPE_MAIN;
1403 	int err;
1404 
1405 	if (rt) {
1406 		upt = nla_data(rt);
1407 		type = upt->type;
1408 	}
1409 
1410 	err = verify_policy_type(type);
1411 	if (err)
1412 		return err;
1413 
1414 	*tp = type;
1415 	return 0;
1416 }
1417 
1418 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1419 {
1420 	xp->priority = p->priority;
1421 	xp->index = p->index;
1422 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1423 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1424 	xp->action = p->action;
1425 	xp->flags = p->flags;
1426 	xp->family = p->sel.family;
1427 	/* XXX xp->share = p->share; */
1428 }
1429 
1430 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1431 {
1432 	memset(p, 0, sizeof(*p));
1433 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1434 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1435 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1436 	p->priority = xp->priority;
1437 	p->index = xp->index;
1438 	p->sel.family = xp->family;
1439 	p->dir = dir;
1440 	p->action = xp->action;
1441 	p->flags = xp->flags;
1442 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1443 }
1444 
1445 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1446 {
1447 	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1448 	int err;
1449 
1450 	if (!xp) {
1451 		*errp = -ENOMEM;
1452 		return NULL;
1453 	}
1454 
1455 	copy_from_user_policy(xp, p);
1456 
1457 	err = copy_from_user_policy_type(&xp->type, attrs);
1458 	if (err)
1459 		goto error;
1460 
1461 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1462 		err = copy_from_user_sec_ctx(xp, attrs);
1463 	if (err)
1464 		goto error;
1465 
1466 	xfrm_mark_get(attrs, &xp->mark);
1467 
1468 	return xp;
1469  error:
1470 	*errp = err;
1471 	xp->walk.dead = 1;
1472 	xfrm_policy_destroy(xp);
1473 	return NULL;
1474 }
1475 
1476 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1477 		struct nlattr **attrs)
1478 {
1479 	struct net *net = sock_net(skb->sk);
1480 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1481 	struct xfrm_policy *xp;
1482 	struct km_event c;
1483 	int err;
1484 	int excl;
1485 
1486 	err = verify_newpolicy_info(p);
1487 	if (err)
1488 		return err;
1489 	err = verify_sec_ctx_len(attrs);
1490 	if (err)
1491 		return err;
1492 
1493 	xp = xfrm_policy_construct(net, p, attrs, &err);
1494 	if (!xp)
1495 		return err;
1496 
1497 	/* shouldn't excl be based on nlh flags??
1498 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1499 	 * in netlink excl is a flag and you wouldnt need
1500 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1501 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1502 	err = xfrm_policy_insert(p->dir, xp, excl);
1503 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1504 
1505 	if (err) {
1506 		security_xfrm_policy_free(xp->security);
1507 		kfree(xp);
1508 		return err;
1509 	}
1510 
1511 	c.event = nlh->nlmsg_type;
1512 	c.seq = nlh->nlmsg_seq;
1513 	c.portid = nlh->nlmsg_pid;
1514 	km_policy_notify(xp, p->dir, &c);
1515 
1516 	xfrm_pol_put(xp);
1517 
1518 	return 0;
1519 }
1520 
1521 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1522 {
1523 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1524 	int i;
1525 
1526 	if (xp->xfrm_nr == 0)
1527 		return 0;
1528 
1529 	for (i = 0; i < xp->xfrm_nr; i++) {
1530 		struct xfrm_user_tmpl *up = &vec[i];
1531 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1532 
1533 		memset(up, 0, sizeof(*up));
1534 		memcpy(&up->id, &kp->id, sizeof(up->id));
1535 		up->family = kp->encap_family;
1536 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1537 		up->reqid = kp->reqid;
1538 		up->mode = kp->mode;
1539 		up->share = kp->share;
1540 		up->optional = kp->optional;
1541 		up->aalgos = kp->aalgos;
1542 		up->ealgos = kp->ealgos;
1543 		up->calgos = kp->calgos;
1544 	}
1545 
1546 	return nla_put(skb, XFRMA_TMPL,
1547 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1548 }
1549 
1550 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1551 {
1552 	if (x->security) {
1553 		return copy_sec_ctx(x->security, skb);
1554 	}
1555 	return 0;
1556 }
1557 
1558 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1559 {
1560 	if (xp->security)
1561 		return copy_sec_ctx(xp->security, skb);
1562 	return 0;
1563 }
1564 static inline size_t userpolicy_type_attrsize(void)
1565 {
1566 #ifdef CONFIG_XFRM_SUB_POLICY
1567 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1568 #else
1569 	return 0;
1570 #endif
1571 }
1572 
1573 #ifdef CONFIG_XFRM_SUB_POLICY
1574 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1575 {
1576 	struct xfrm_userpolicy_type upt = {
1577 		.type = type,
1578 	};
1579 
1580 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1581 }
1582 
1583 #else
1584 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1585 {
1586 	return 0;
1587 }
1588 #endif
1589 
1590 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1591 {
1592 	struct xfrm_dump_info *sp = ptr;
1593 	struct xfrm_userpolicy_info *p;
1594 	struct sk_buff *in_skb = sp->in_skb;
1595 	struct sk_buff *skb = sp->out_skb;
1596 	struct nlmsghdr *nlh;
1597 	int err;
1598 
1599 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1600 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1601 	if (nlh == NULL)
1602 		return -EMSGSIZE;
1603 
1604 	p = nlmsg_data(nlh);
1605 	copy_to_user_policy(xp, p, dir);
1606 	err = copy_to_user_tmpl(xp, skb);
1607 	if (!err)
1608 		err = copy_to_user_sec_ctx(xp, skb);
1609 	if (!err)
1610 		err = copy_to_user_policy_type(xp->type, skb);
1611 	if (!err)
1612 		err = xfrm_mark_put(skb, &xp->mark);
1613 	if (err) {
1614 		nlmsg_cancel(skb, nlh);
1615 		return err;
1616 	}
1617 	nlmsg_end(skb, nlh);
1618 	return 0;
1619 }
1620 
1621 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1622 {
1623 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1624 	struct net *net = sock_net(cb->skb->sk);
1625 
1626 	xfrm_policy_walk_done(walk, net);
1627 	return 0;
1628 }
1629 
1630 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1631 {
1632 	struct net *net = sock_net(skb->sk);
1633 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1634 	struct xfrm_dump_info info;
1635 
1636 	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1637 		     sizeof(cb->args) - sizeof(cb->args[0]));
1638 
1639 	info.in_skb = cb->skb;
1640 	info.out_skb = skb;
1641 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1642 	info.nlmsg_flags = NLM_F_MULTI;
1643 
1644 	if (!cb->args[0]) {
1645 		cb->args[0] = 1;
1646 		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1647 	}
1648 
1649 	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1650 
1651 	return skb->len;
1652 }
1653 
1654 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1655 					  struct xfrm_policy *xp,
1656 					  int dir, u32 seq)
1657 {
1658 	struct xfrm_dump_info info;
1659 	struct sk_buff *skb;
1660 	int err;
1661 
1662 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1663 	if (!skb)
1664 		return ERR_PTR(-ENOMEM);
1665 
1666 	info.in_skb = in_skb;
1667 	info.out_skb = skb;
1668 	info.nlmsg_seq = seq;
1669 	info.nlmsg_flags = 0;
1670 
1671 	err = dump_one_policy(xp, dir, 0, &info);
1672 	if (err) {
1673 		kfree_skb(skb);
1674 		return ERR_PTR(err);
1675 	}
1676 
1677 	return skb;
1678 }
1679 
1680 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1681 		struct nlattr **attrs)
1682 {
1683 	struct net *net = sock_net(skb->sk);
1684 	struct xfrm_policy *xp;
1685 	struct xfrm_userpolicy_id *p;
1686 	u8 type = XFRM_POLICY_TYPE_MAIN;
1687 	int err;
1688 	struct km_event c;
1689 	int delete;
1690 	struct xfrm_mark m;
1691 	u32 mark = xfrm_mark_get(attrs, &m);
1692 
1693 	p = nlmsg_data(nlh);
1694 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1695 
1696 	err = copy_from_user_policy_type(&type, attrs);
1697 	if (err)
1698 		return err;
1699 
1700 	err = verify_policy_dir(p->dir);
1701 	if (err)
1702 		return err;
1703 
1704 	if (p->index)
1705 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1706 	else {
1707 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1708 		struct xfrm_sec_ctx *ctx;
1709 
1710 		err = verify_sec_ctx_len(attrs);
1711 		if (err)
1712 			return err;
1713 
1714 		ctx = NULL;
1715 		if (rt) {
1716 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1717 
1718 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1719 			if (err)
1720 				return err;
1721 		}
1722 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1723 					   ctx, delete, &err);
1724 		security_xfrm_policy_free(ctx);
1725 	}
1726 	if (xp == NULL)
1727 		return -ENOENT;
1728 
1729 	if (!delete) {
1730 		struct sk_buff *resp_skb;
1731 
1732 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1733 		if (IS_ERR(resp_skb)) {
1734 			err = PTR_ERR(resp_skb);
1735 		} else {
1736 			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1737 					    NETLINK_CB(skb).portid);
1738 		}
1739 	} else {
1740 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1741 
1742 		if (err != 0)
1743 			goto out;
1744 
1745 		c.data.byid = p->index;
1746 		c.event = nlh->nlmsg_type;
1747 		c.seq = nlh->nlmsg_seq;
1748 		c.portid = nlh->nlmsg_pid;
1749 		km_policy_notify(xp, p->dir, &c);
1750 	}
1751 
1752 out:
1753 	xfrm_pol_put(xp);
1754 	if (delete && err == 0)
1755 		xfrm_garbage_collect(net);
1756 	return err;
1757 }
1758 
1759 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1760 		struct nlattr **attrs)
1761 {
1762 	struct net *net = sock_net(skb->sk);
1763 	struct km_event c;
1764 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1765 	int err;
1766 
1767 	err = xfrm_state_flush(net, p->proto, true);
1768 	if (err) {
1769 		if (err == -ESRCH) /* empty table */
1770 			return 0;
1771 		return err;
1772 	}
1773 	c.data.proto = p->proto;
1774 	c.event = nlh->nlmsg_type;
1775 	c.seq = nlh->nlmsg_seq;
1776 	c.portid = nlh->nlmsg_pid;
1777 	c.net = net;
1778 	km_state_notify(NULL, &c);
1779 
1780 	return 0;
1781 }
1782 
1783 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1784 {
1785 	size_t replay_size = x->replay_esn ?
1786 			      xfrm_replay_state_esn_len(x->replay_esn) :
1787 			      sizeof(struct xfrm_replay_state);
1788 
1789 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1790 	       + nla_total_size(replay_size)
1791 	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1792 	       + nla_total_size(sizeof(struct xfrm_mark))
1793 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1794 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1795 }
1796 
1797 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1798 {
1799 	struct xfrm_aevent_id *id;
1800 	struct nlmsghdr *nlh;
1801 	int err;
1802 
1803 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1804 	if (nlh == NULL)
1805 		return -EMSGSIZE;
1806 
1807 	id = nlmsg_data(nlh);
1808 	memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1809 	id->sa_id.spi = x->id.spi;
1810 	id->sa_id.family = x->props.family;
1811 	id->sa_id.proto = x->id.proto;
1812 	memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1813 	id->reqid = x->props.reqid;
1814 	id->flags = c->data.aevent;
1815 
1816 	if (x->replay_esn) {
1817 		err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1818 			      xfrm_replay_state_esn_len(x->replay_esn),
1819 			      x->replay_esn);
1820 	} else {
1821 		err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1822 			      &x->replay);
1823 	}
1824 	if (err)
1825 		goto out_cancel;
1826 	err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1827 	if (err)
1828 		goto out_cancel;
1829 
1830 	if (id->flags & XFRM_AE_RTHR) {
1831 		err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1832 		if (err)
1833 			goto out_cancel;
1834 	}
1835 	if (id->flags & XFRM_AE_ETHR) {
1836 		err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1837 				  x->replay_maxage * 10 / HZ);
1838 		if (err)
1839 			goto out_cancel;
1840 	}
1841 	err = xfrm_mark_put(skb, &x->mark);
1842 	if (err)
1843 		goto out_cancel;
1844 
1845 	return nlmsg_end(skb, nlh);
1846 
1847 out_cancel:
1848 	nlmsg_cancel(skb, nlh);
1849 	return err;
1850 }
1851 
1852 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1853 		struct nlattr **attrs)
1854 {
1855 	struct net *net = sock_net(skb->sk);
1856 	struct xfrm_state *x;
1857 	struct sk_buff *r_skb;
1858 	int err;
1859 	struct km_event c;
1860 	u32 mark;
1861 	struct xfrm_mark m;
1862 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1863 	struct xfrm_usersa_id *id = &p->sa_id;
1864 
1865 	mark = xfrm_mark_get(attrs, &m);
1866 
1867 	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1868 	if (x == NULL)
1869 		return -ESRCH;
1870 
1871 	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1872 	if (r_skb == NULL) {
1873 		xfrm_state_put(x);
1874 		return -ENOMEM;
1875 	}
1876 
1877 	/*
1878 	 * XXX: is this lock really needed - none of the other
1879 	 * gets lock (the concern is things getting updated
1880 	 * while we are still reading) - jhs
1881 	*/
1882 	spin_lock_bh(&x->lock);
1883 	c.data.aevent = p->flags;
1884 	c.seq = nlh->nlmsg_seq;
1885 	c.portid = nlh->nlmsg_pid;
1886 
1887 	if (build_aevent(r_skb, x, &c) < 0)
1888 		BUG();
1889 	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1890 	spin_unlock_bh(&x->lock);
1891 	xfrm_state_put(x);
1892 	return err;
1893 }
1894 
1895 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1896 		struct nlattr **attrs)
1897 {
1898 	struct net *net = sock_net(skb->sk);
1899 	struct xfrm_state *x;
1900 	struct km_event c;
1901 	int err = -EINVAL;
1902 	u32 mark = 0;
1903 	struct xfrm_mark m;
1904 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1905 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1906 	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1907 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1908 
1909 	if (!lt && !rp && !re)
1910 		return err;
1911 
1912 	/* pedantic mode - thou shalt sayeth replaceth */
1913 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1914 		return err;
1915 
1916 	mark = xfrm_mark_get(attrs, &m);
1917 
1918 	x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1919 	if (x == NULL)
1920 		return -ESRCH;
1921 
1922 	if (x->km.state != XFRM_STATE_VALID)
1923 		goto out;
1924 
1925 	err = xfrm_replay_verify_len(x->replay_esn, re);
1926 	if (err)
1927 		goto out;
1928 
1929 	spin_lock_bh(&x->lock);
1930 	xfrm_update_ae_params(x, attrs, 1);
1931 	spin_unlock_bh(&x->lock);
1932 
1933 	c.event = nlh->nlmsg_type;
1934 	c.seq = nlh->nlmsg_seq;
1935 	c.portid = nlh->nlmsg_pid;
1936 	c.data.aevent = XFRM_AE_CU;
1937 	km_state_notify(x, &c);
1938 	err = 0;
1939 out:
1940 	xfrm_state_put(x);
1941 	return err;
1942 }
1943 
1944 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1945 		struct nlattr **attrs)
1946 {
1947 	struct net *net = sock_net(skb->sk);
1948 	struct km_event c;
1949 	u8 type = XFRM_POLICY_TYPE_MAIN;
1950 	int err;
1951 
1952 	err = copy_from_user_policy_type(&type, attrs);
1953 	if (err)
1954 		return err;
1955 
1956 	err = xfrm_policy_flush(net, type, true);
1957 	if (err) {
1958 		if (err == -ESRCH) /* empty table */
1959 			return 0;
1960 		return err;
1961 	}
1962 
1963 	c.data.type = type;
1964 	c.event = nlh->nlmsg_type;
1965 	c.seq = nlh->nlmsg_seq;
1966 	c.portid = nlh->nlmsg_pid;
1967 	c.net = net;
1968 	km_policy_notify(NULL, 0, &c);
1969 	return 0;
1970 }
1971 
1972 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1973 		struct nlattr **attrs)
1974 {
1975 	struct net *net = sock_net(skb->sk);
1976 	struct xfrm_policy *xp;
1977 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1978 	struct xfrm_userpolicy_info *p = &up->pol;
1979 	u8 type = XFRM_POLICY_TYPE_MAIN;
1980 	int err = -ENOENT;
1981 	struct xfrm_mark m;
1982 	u32 mark = xfrm_mark_get(attrs, &m);
1983 
1984 	err = copy_from_user_policy_type(&type, attrs);
1985 	if (err)
1986 		return err;
1987 
1988 	err = verify_policy_dir(p->dir);
1989 	if (err)
1990 		return err;
1991 
1992 	if (p->index)
1993 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1994 	else {
1995 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1996 		struct xfrm_sec_ctx *ctx;
1997 
1998 		err = verify_sec_ctx_len(attrs);
1999 		if (err)
2000 			return err;
2001 
2002 		ctx = NULL;
2003 		if (rt) {
2004 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2005 
2006 			err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2007 			if (err)
2008 				return err;
2009 		}
2010 		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2011 					   &p->sel, ctx, 0, &err);
2012 		security_xfrm_policy_free(ctx);
2013 	}
2014 	if (xp == NULL)
2015 		return -ENOENT;
2016 
2017 	if (unlikely(xp->walk.dead))
2018 		goto out;
2019 
2020 	err = 0;
2021 	if (up->hard) {
2022 		xfrm_policy_delete(xp, p->dir);
2023 		xfrm_audit_policy_delete(xp, 1, true);
2024 	} else {
2025 		// reset the timers here?
2026 		WARN(1, "Dont know what to do with soft policy expire\n");
2027 	}
2028 	km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2029 
2030 out:
2031 	xfrm_pol_put(xp);
2032 	return err;
2033 }
2034 
2035 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2036 		struct nlattr **attrs)
2037 {
2038 	struct net *net = sock_net(skb->sk);
2039 	struct xfrm_state *x;
2040 	int err;
2041 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
2042 	struct xfrm_usersa_info *p = &ue->state;
2043 	struct xfrm_mark m;
2044 	u32 mark = xfrm_mark_get(attrs, &m);
2045 
2046 	x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2047 
2048 	err = -ENOENT;
2049 	if (x == NULL)
2050 		return err;
2051 
2052 	spin_lock_bh(&x->lock);
2053 	err = -EINVAL;
2054 	if (x->km.state != XFRM_STATE_VALID)
2055 		goto out;
2056 	km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2057 
2058 	if (ue->hard) {
2059 		__xfrm_state_delete(x);
2060 		xfrm_audit_state_delete(x, 1, true);
2061 	}
2062 	err = 0;
2063 out:
2064 	spin_unlock_bh(&x->lock);
2065 	xfrm_state_put(x);
2066 	return err;
2067 }
2068 
2069 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2070 		struct nlattr **attrs)
2071 {
2072 	struct net *net = sock_net(skb->sk);
2073 	struct xfrm_policy *xp;
2074 	struct xfrm_user_tmpl *ut;
2075 	int i;
2076 	struct nlattr *rt = attrs[XFRMA_TMPL];
2077 	struct xfrm_mark mark;
2078 
2079 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2080 	struct xfrm_state *x = xfrm_state_alloc(net);
2081 	int err = -ENOMEM;
2082 
2083 	if (!x)
2084 		goto nomem;
2085 
2086 	xfrm_mark_get(attrs, &mark);
2087 
2088 	err = verify_newpolicy_info(&ua->policy);
2089 	if (err)
2090 		goto bad_policy;
2091 
2092 	/*   build an XP */
2093 	xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2094 	if (!xp)
2095 		goto free_state;
2096 
2097 	memcpy(&x->id, &ua->id, sizeof(ua->id));
2098 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2099 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2100 	xp->mark.m = x->mark.m = mark.m;
2101 	xp->mark.v = x->mark.v = mark.v;
2102 	ut = nla_data(rt);
2103 	/* extract the templates and for each call km_key */
2104 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2105 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2106 		memcpy(&x->id, &t->id, sizeof(x->id));
2107 		x->props.mode = t->mode;
2108 		x->props.reqid = t->reqid;
2109 		x->props.family = ut->family;
2110 		t->aalgos = ua->aalgos;
2111 		t->ealgos = ua->ealgos;
2112 		t->calgos = ua->calgos;
2113 		err = km_query(x, t, xp);
2114 
2115 	}
2116 
2117 	kfree(x);
2118 	kfree(xp);
2119 
2120 	return 0;
2121 
2122 bad_policy:
2123 	WARN(1, "BAD policy passed\n");
2124 free_state:
2125 	kfree(x);
2126 nomem:
2127 	return err;
2128 }
2129 
2130 #ifdef CONFIG_XFRM_MIGRATE
2131 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2132 				  struct xfrm_kmaddress *k,
2133 				  struct nlattr **attrs, int *num)
2134 {
2135 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
2136 	struct xfrm_user_migrate *um;
2137 	int i, num_migrate;
2138 
2139 	if (k != NULL) {
2140 		struct xfrm_user_kmaddress *uk;
2141 
2142 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
2143 		memcpy(&k->local, &uk->local, sizeof(k->local));
2144 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2145 		k->family = uk->family;
2146 		k->reserved = uk->reserved;
2147 	}
2148 
2149 	um = nla_data(rt);
2150 	num_migrate = nla_len(rt) / sizeof(*um);
2151 
2152 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2153 		return -EINVAL;
2154 
2155 	for (i = 0; i < num_migrate; i++, um++, ma++) {
2156 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2157 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2158 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2159 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2160 
2161 		ma->proto = um->proto;
2162 		ma->mode = um->mode;
2163 		ma->reqid = um->reqid;
2164 
2165 		ma->old_family = um->old_family;
2166 		ma->new_family = um->new_family;
2167 	}
2168 
2169 	*num = i;
2170 	return 0;
2171 }
2172 
2173 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2174 			   struct nlattr **attrs)
2175 {
2176 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2177 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2178 	struct xfrm_kmaddress km, *kmp;
2179 	u8 type;
2180 	int err;
2181 	int n = 0;
2182 	struct net *net = sock_net(skb->sk);
2183 
2184 	if (attrs[XFRMA_MIGRATE] == NULL)
2185 		return -EINVAL;
2186 
2187 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2188 
2189 	err = copy_from_user_policy_type(&type, attrs);
2190 	if (err)
2191 		return err;
2192 
2193 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2194 	if (err)
2195 		return err;
2196 
2197 	if (!n)
2198 		return 0;
2199 
2200 	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2201 
2202 	return 0;
2203 }
2204 #else
2205 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2206 			   struct nlattr **attrs)
2207 {
2208 	return -ENOPROTOOPT;
2209 }
2210 #endif
2211 
2212 #ifdef CONFIG_XFRM_MIGRATE
2213 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2214 {
2215 	struct xfrm_user_migrate um;
2216 
2217 	memset(&um, 0, sizeof(um));
2218 	um.proto = m->proto;
2219 	um.mode = m->mode;
2220 	um.reqid = m->reqid;
2221 	um.old_family = m->old_family;
2222 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2223 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2224 	um.new_family = m->new_family;
2225 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2226 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2227 
2228 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2229 }
2230 
2231 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2232 {
2233 	struct xfrm_user_kmaddress uk;
2234 
2235 	memset(&uk, 0, sizeof(uk));
2236 	uk.family = k->family;
2237 	uk.reserved = k->reserved;
2238 	memcpy(&uk.local, &k->local, sizeof(uk.local));
2239 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2240 
2241 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2242 }
2243 
2244 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2245 {
2246 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2247 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2248 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2249 	      + userpolicy_type_attrsize();
2250 }
2251 
2252 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2253 			 int num_migrate, const struct xfrm_kmaddress *k,
2254 			 const struct xfrm_selector *sel, u8 dir, u8 type)
2255 {
2256 	const struct xfrm_migrate *mp;
2257 	struct xfrm_userpolicy_id *pol_id;
2258 	struct nlmsghdr *nlh;
2259 	int i, err;
2260 
2261 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2262 	if (nlh == NULL)
2263 		return -EMSGSIZE;
2264 
2265 	pol_id = nlmsg_data(nlh);
2266 	/* copy data from selector, dir, and type to the pol_id */
2267 	memset(pol_id, 0, sizeof(*pol_id));
2268 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2269 	pol_id->dir = dir;
2270 
2271 	if (k != NULL) {
2272 		err = copy_to_user_kmaddress(k, skb);
2273 		if (err)
2274 			goto out_cancel;
2275 	}
2276 	err = copy_to_user_policy_type(type, skb);
2277 	if (err)
2278 		goto out_cancel;
2279 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2280 		err = copy_to_user_migrate(mp, skb);
2281 		if (err)
2282 			goto out_cancel;
2283 	}
2284 
2285 	return nlmsg_end(skb, nlh);
2286 
2287 out_cancel:
2288 	nlmsg_cancel(skb, nlh);
2289 	return err;
2290 }
2291 
2292 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2293 			     const struct xfrm_migrate *m, int num_migrate,
2294 			     const struct xfrm_kmaddress *k)
2295 {
2296 	struct net *net = &init_net;
2297 	struct sk_buff *skb;
2298 
2299 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2300 	if (skb == NULL)
2301 		return -ENOMEM;
2302 
2303 	/* build migrate */
2304 	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2305 		BUG();
2306 
2307 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2308 }
2309 #else
2310 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2311 			     const struct xfrm_migrate *m, int num_migrate,
2312 			     const struct xfrm_kmaddress *k)
2313 {
2314 	return -ENOPROTOOPT;
2315 }
2316 #endif
2317 
2318 #define XMSGSIZE(type) sizeof(struct type)
2319 
2320 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2321 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2322 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2323 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2324 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2325 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2326 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2327 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2328 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2329 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2330 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2331 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2332 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2333 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2334 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2335 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2336 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2337 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2338 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2339 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2340 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2341 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2342 };
2343 
2344 #undef XMSGSIZE
2345 
2346 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2347 	[XFRMA_SA]		= { .len = sizeof(struct xfrm_usersa_info)},
2348 	[XFRMA_POLICY]		= { .len = sizeof(struct xfrm_userpolicy_info)},
2349 	[XFRMA_LASTUSED]	= { .type = NLA_U64},
2350 	[XFRMA_ALG_AUTH_TRUNC]	= { .len = sizeof(struct xfrm_algo_auth)},
2351 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
2352 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
2353 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
2354 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
2355 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
2356 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
2357 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
2358 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
2359 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
2360 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
2361 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
2362 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
2363 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
2364 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
2365 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
2366 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
2367 	[XFRMA_MARK]		= { .len = sizeof(struct xfrm_mark) },
2368 	[XFRMA_TFCPAD]		= { .type = NLA_U32 },
2369 	[XFRMA_REPLAY_ESN_VAL]	= { .len = sizeof(struct xfrm_replay_state_esn) },
2370 	[XFRMA_SA_EXTRA_FLAGS]	= { .type = NLA_U32 },
2371 	[XFRMA_PROTO]		= { .type = NLA_U8 },
2372 	[XFRMA_ADDRESS_FILTER]	= { .len = sizeof(struct xfrm_address_filter) },
2373 };
2374 
2375 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2376 	[XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2377 	[XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2378 };
2379 
2380 static const struct xfrm_link {
2381 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2382 	int (*dump)(struct sk_buff *, struct netlink_callback *);
2383 	int (*done)(struct netlink_callback *);
2384 	const struct nla_policy *nla_pol;
2385 	int nla_max;
2386 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2387 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2388 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2389 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2390 						   .dump = xfrm_dump_sa,
2391 						   .done = xfrm_dump_sa_done  },
2392 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2393 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2394 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2395 						   .dump = xfrm_dump_policy,
2396 						   .done = xfrm_dump_policy_done },
2397 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2398 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2399 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2400 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2401 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2402 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2403 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2404 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2405 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2406 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2407 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2408 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2409 	[XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2410 						   .nla_pol = xfrma_spd_policy,
2411 						   .nla_max = XFRMA_SPD_MAX },
2412 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2413 };
2414 
2415 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2416 {
2417 	struct net *net = sock_net(skb->sk);
2418 	struct nlattr *attrs[XFRMA_MAX+1];
2419 	const struct xfrm_link *link;
2420 	int type, err;
2421 
2422 	type = nlh->nlmsg_type;
2423 	if (type > XFRM_MSG_MAX)
2424 		return -EINVAL;
2425 
2426 	type -= XFRM_MSG_BASE;
2427 	link = &xfrm_dispatch[type];
2428 
2429 	/* All operations require privileges, even GET */
2430 	if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2431 		return -EPERM;
2432 
2433 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2434 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2435 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
2436 		if (link->dump == NULL)
2437 			return -EINVAL;
2438 
2439 		{
2440 			struct netlink_dump_control c = {
2441 				.dump = link->dump,
2442 				.done = link->done,
2443 			};
2444 			return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2445 		}
2446 	}
2447 
2448 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2449 			  link->nla_max ? : XFRMA_MAX,
2450 			  link->nla_pol ? : xfrma_policy);
2451 	if (err < 0)
2452 		return err;
2453 
2454 	if (link->doit == NULL)
2455 		return -EINVAL;
2456 
2457 	return link->doit(skb, nlh, attrs);
2458 }
2459 
2460 static void xfrm_netlink_rcv(struct sk_buff *skb)
2461 {
2462 	struct net *net = sock_net(skb->sk);
2463 
2464 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2465 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2466 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2467 }
2468 
2469 static inline size_t xfrm_expire_msgsize(void)
2470 {
2471 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2472 	       + nla_total_size(sizeof(struct xfrm_mark));
2473 }
2474 
2475 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2476 {
2477 	struct xfrm_user_expire *ue;
2478 	struct nlmsghdr *nlh;
2479 	int err;
2480 
2481 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2482 	if (nlh == NULL)
2483 		return -EMSGSIZE;
2484 
2485 	ue = nlmsg_data(nlh);
2486 	copy_to_user_state(x, &ue->state);
2487 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2488 
2489 	err = xfrm_mark_put(skb, &x->mark);
2490 	if (err)
2491 		return err;
2492 
2493 	return nlmsg_end(skb, nlh);
2494 }
2495 
2496 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2497 {
2498 	struct net *net = xs_net(x);
2499 	struct sk_buff *skb;
2500 
2501 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2502 	if (skb == NULL)
2503 		return -ENOMEM;
2504 
2505 	if (build_expire(skb, x, c) < 0) {
2506 		kfree_skb(skb);
2507 		return -EMSGSIZE;
2508 	}
2509 
2510 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2511 }
2512 
2513 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2514 {
2515 	struct net *net = xs_net(x);
2516 	struct sk_buff *skb;
2517 
2518 	skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2519 	if (skb == NULL)
2520 		return -ENOMEM;
2521 
2522 	if (build_aevent(skb, x, c) < 0)
2523 		BUG();
2524 
2525 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2526 }
2527 
2528 static int xfrm_notify_sa_flush(const struct km_event *c)
2529 {
2530 	struct net *net = c->net;
2531 	struct xfrm_usersa_flush *p;
2532 	struct nlmsghdr *nlh;
2533 	struct sk_buff *skb;
2534 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2535 
2536 	skb = nlmsg_new(len, GFP_ATOMIC);
2537 	if (skb == NULL)
2538 		return -ENOMEM;
2539 
2540 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2541 	if (nlh == NULL) {
2542 		kfree_skb(skb);
2543 		return -EMSGSIZE;
2544 	}
2545 
2546 	p = nlmsg_data(nlh);
2547 	p->proto = c->data.proto;
2548 
2549 	nlmsg_end(skb, nlh);
2550 
2551 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2552 }
2553 
2554 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2555 {
2556 	size_t l = 0;
2557 	if (x->aead)
2558 		l += nla_total_size(aead_len(x->aead));
2559 	if (x->aalg) {
2560 		l += nla_total_size(sizeof(struct xfrm_algo) +
2561 				    (x->aalg->alg_key_len + 7) / 8);
2562 		l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2563 	}
2564 	if (x->ealg)
2565 		l += nla_total_size(xfrm_alg_len(x->ealg));
2566 	if (x->calg)
2567 		l += nla_total_size(sizeof(*x->calg));
2568 	if (x->encap)
2569 		l += nla_total_size(sizeof(*x->encap));
2570 	if (x->tfcpad)
2571 		l += nla_total_size(sizeof(x->tfcpad));
2572 	if (x->replay_esn)
2573 		l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2574 	else
2575 		l += nla_total_size(sizeof(struct xfrm_replay_state));
2576 	if (x->security)
2577 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2578 				    x->security->ctx_len);
2579 	if (x->coaddr)
2580 		l += nla_total_size(sizeof(*x->coaddr));
2581 	if (x->props.extra_flags)
2582 		l += nla_total_size(sizeof(x->props.extra_flags));
2583 
2584 	/* Must count x->lastused as it may become non-zero behind our back. */
2585 	l += nla_total_size(sizeof(u64));
2586 
2587 	return l;
2588 }
2589 
2590 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2591 {
2592 	struct net *net = xs_net(x);
2593 	struct xfrm_usersa_info *p;
2594 	struct xfrm_usersa_id *id;
2595 	struct nlmsghdr *nlh;
2596 	struct sk_buff *skb;
2597 	int len = xfrm_sa_len(x);
2598 	int headlen, err;
2599 
2600 	headlen = sizeof(*p);
2601 	if (c->event == XFRM_MSG_DELSA) {
2602 		len += nla_total_size(headlen);
2603 		headlen = sizeof(*id);
2604 		len += nla_total_size(sizeof(struct xfrm_mark));
2605 	}
2606 	len += NLMSG_ALIGN(headlen);
2607 
2608 	skb = nlmsg_new(len, GFP_ATOMIC);
2609 	if (skb == NULL)
2610 		return -ENOMEM;
2611 
2612 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2613 	err = -EMSGSIZE;
2614 	if (nlh == NULL)
2615 		goto out_free_skb;
2616 
2617 	p = nlmsg_data(nlh);
2618 	if (c->event == XFRM_MSG_DELSA) {
2619 		struct nlattr *attr;
2620 
2621 		id = nlmsg_data(nlh);
2622 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2623 		id->spi = x->id.spi;
2624 		id->family = x->props.family;
2625 		id->proto = x->id.proto;
2626 
2627 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2628 		err = -EMSGSIZE;
2629 		if (attr == NULL)
2630 			goto out_free_skb;
2631 
2632 		p = nla_data(attr);
2633 	}
2634 	err = copy_to_user_state_extra(x, p, skb);
2635 	if (err)
2636 		goto out_free_skb;
2637 
2638 	nlmsg_end(skb, nlh);
2639 
2640 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2641 
2642 out_free_skb:
2643 	kfree_skb(skb);
2644 	return err;
2645 }
2646 
2647 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2648 {
2649 
2650 	switch (c->event) {
2651 	case XFRM_MSG_EXPIRE:
2652 		return xfrm_exp_state_notify(x, c);
2653 	case XFRM_MSG_NEWAE:
2654 		return xfrm_aevent_state_notify(x, c);
2655 	case XFRM_MSG_DELSA:
2656 	case XFRM_MSG_UPDSA:
2657 	case XFRM_MSG_NEWSA:
2658 		return xfrm_notify_sa(x, c);
2659 	case XFRM_MSG_FLUSHSA:
2660 		return xfrm_notify_sa_flush(c);
2661 	default:
2662 		printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2663 		       c->event);
2664 		break;
2665 	}
2666 
2667 	return 0;
2668 
2669 }
2670 
2671 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2672 					  struct xfrm_policy *xp)
2673 {
2674 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2675 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2676 	       + nla_total_size(sizeof(struct xfrm_mark))
2677 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2678 	       + userpolicy_type_attrsize();
2679 }
2680 
2681 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2682 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2683 {
2684 	__u32 seq = xfrm_get_acqseq();
2685 	struct xfrm_user_acquire *ua;
2686 	struct nlmsghdr *nlh;
2687 	int err;
2688 
2689 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2690 	if (nlh == NULL)
2691 		return -EMSGSIZE;
2692 
2693 	ua = nlmsg_data(nlh);
2694 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2695 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2696 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2697 	copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2698 	ua->aalgos = xt->aalgos;
2699 	ua->ealgos = xt->ealgos;
2700 	ua->calgos = xt->calgos;
2701 	ua->seq = x->km.seq = seq;
2702 
2703 	err = copy_to_user_tmpl(xp, skb);
2704 	if (!err)
2705 		err = copy_to_user_state_sec_ctx(x, skb);
2706 	if (!err)
2707 		err = copy_to_user_policy_type(xp->type, skb);
2708 	if (!err)
2709 		err = xfrm_mark_put(skb, &xp->mark);
2710 	if (err) {
2711 		nlmsg_cancel(skb, nlh);
2712 		return err;
2713 	}
2714 
2715 	return nlmsg_end(skb, nlh);
2716 }
2717 
2718 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2719 			     struct xfrm_policy *xp)
2720 {
2721 	struct net *net = xs_net(x);
2722 	struct sk_buff *skb;
2723 
2724 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2725 	if (skb == NULL)
2726 		return -ENOMEM;
2727 
2728 	if (build_acquire(skb, x, xt, xp) < 0)
2729 		BUG();
2730 
2731 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2732 }
2733 
2734 /* User gives us xfrm_user_policy_info followed by an array of 0
2735  * or more templates.
2736  */
2737 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2738 					       u8 *data, int len, int *dir)
2739 {
2740 	struct net *net = sock_net(sk);
2741 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2742 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2743 	struct xfrm_policy *xp;
2744 	int nr;
2745 
2746 	switch (sk->sk_family) {
2747 	case AF_INET:
2748 		if (opt != IP_XFRM_POLICY) {
2749 			*dir = -EOPNOTSUPP;
2750 			return NULL;
2751 		}
2752 		break;
2753 #if IS_ENABLED(CONFIG_IPV6)
2754 	case AF_INET6:
2755 		if (opt != IPV6_XFRM_POLICY) {
2756 			*dir = -EOPNOTSUPP;
2757 			return NULL;
2758 		}
2759 		break;
2760 #endif
2761 	default:
2762 		*dir = -EINVAL;
2763 		return NULL;
2764 	}
2765 
2766 	*dir = -EINVAL;
2767 
2768 	if (len < sizeof(*p) ||
2769 	    verify_newpolicy_info(p))
2770 		return NULL;
2771 
2772 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2773 	if (validate_tmpl(nr, ut, p->sel.family))
2774 		return NULL;
2775 
2776 	if (p->dir > XFRM_POLICY_OUT)
2777 		return NULL;
2778 
2779 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2780 	if (xp == NULL) {
2781 		*dir = -ENOBUFS;
2782 		return NULL;
2783 	}
2784 
2785 	copy_from_user_policy(xp, p);
2786 	xp->type = XFRM_POLICY_TYPE_MAIN;
2787 	copy_templates(xp, ut, nr);
2788 
2789 	*dir = p->dir;
2790 
2791 	return xp;
2792 }
2793 
2794 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2795 {
2796 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2797 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2798 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2799 	       + nla_total_size(sizeof(struct xfrm_mark))
2800 	       + userpolicy_type_attrsize();
2801 }
2802 
2803 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2804 			   int dir, const struct km_event *c)
2805 {
2806 	struct xfrm_user_polexpire *upe;
2807 	int hard = c->data.hard;
2808 	struct nlmsghdr *nlh;
2809 	int err;
2810 
2811 	nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2812 	if (nlh == NULL)
2813 		return -EMSGSIZE;
2814 
2815 	upe = nlmsg_data(nlh);
2816 	copy_to_user_policy(xp, &upe->pol, dir);
2817 	err = copy_to_user_tmpl(xp, skb);
2818 	if (!err)
2819 		err = copy_to_user_sec_ctx(xp, skb);
2820 	if (!err)
2821 		err = copy_to_user_policy_type(xp->type, skb);
2822 	if (!err)
2823 		err = xfrm_mark_put(skb, &xp->mark);
2824 	if (err) {
2825 		nlmsg_cancel(skb, nlh);
2826 		return err;
2827 	}
2828 	upe->hard = !!hard;
2829 
2830 	return nlmsg_end(skb, nlh);
2831 }
2832 
2833 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2834 {
2835 	struct net *net = xp_net(xp);
2836 	struct sk_buff *skb;
2837 
2838 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2839 	if (skb == NULL)
2840 		return -ENOMEM;
2841 
2842 	if (build_polexpire(skb, xp, dir, c) < 0)
2843 		BUG();
2844 
2845 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2846 }
2847 
2848 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2849 {
2850 	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2851 	struct net *net = xp_net(xp);
2852 	struct xfrm_userpolicy_info *p;
2853 	struct xfrm_userpolicy_id *id;
2854 	struct nlmsghdr *nlh;
2855 	struct sk_buff *skb;
2856 	int headlen, err;
2857 
2858 	headlen = sizeof(*p);
2859 	if (c->event == XFRM_MSG_DELPOLICY) {
2860 		len += nla_total_size(headlen);
2861 		headlen = sizeof(*id);
2862 	}
2863 	len += userpolicy_type_attrsize();
2864 	len += nla_total_size(sizeof(struct xfrm_mark));
2865 	len += NLMSG_ALIGN(headlen);
2866 
2867 	skb = nlmsg_new(len, GFP_ATOMIC);
2868 	if (skb == NULL)
2869 		return -ENOMEM;
2870 
2871 	nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2872 	err = -EMSGSIZE;
2873 	if (nlh == NULL)
2874 		goto out_free_skb;
2875 
2876 	p = nlmsg_data(nlh);
2877 	if (c->event == XFRM_MSG_DELPOLICY) {
2878 		struct nlattr *attr;
2879 
2880 		id = nlmsg_data(nlh);
2881 		memset(id, 0, sizeof(*id));
2882 		id->dir = dir;
2883 		if (c->data.byid)
2884 			id->index = xp->index;
2885 		else
2886 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2887 
2888 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2889 		err = -EMSGSIZE;
2890 		if (attr == NULL)
2891 			goto out_free_skb;
2892 
2893 		p = nla_data(attr);
2894 	}
2895 
2896 	copy_to_user_policy(xp, p, dir);
2897 	err = copy_to_user_tmpl(xp, skb);
2898 	if (!err)
2899 		err = copy_to_user_policy_type(xp->type, skb);
2900 	if (!err)
2901 		err = xfrm_mark_put(skb, &xp->mark);
2902 	if (err)
2903 		goto out_free_skb;
2904 
2905 	nlmsg_end(skb, nlh);
2906 
2907 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2908 
2909 out_free_skb:
2910 	kfree_skb(skb);
2911 	return err;
2912 }
2913 
2914 static int xfrm_notify_policy_flush(const struct km_event *c)
2915 {
2916 	struct net *net = c->net;
2917 	struct nlmsghdr *nlh;
2918 	struct sk_buff *skb;
2919 	int err;
2920 
2921 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2922 	if (skb == NULL)
2923 		return -ENOMEM;
2924 
2925 	nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2926 	err = -EMSGSIZE;
2927 	if (nlh == NULL)
2928 		goto out_free_skb;
2929 	err = copy_to_user_policy_type(c->data.type, skb);
2930 	if (err)
2931 		goto out_free_skb;
2932 
2933 	nlmsg_end(skb, nlh);
2934 
2935 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2936 
2937 out_free_skb:
2938 	kfree_skb(skb);
2939 	return err;
2940 }
2941 
2942 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2943 {
2944 
2945 	switch (c->event) {
2946 	case XFRM_MSG_NEWPOLICY:
2947 	case XFRM_MSG_UPDPOLICY:
2948 	case XFRM_MSG_DELPOLICY:
2949 		return xfrm_notify_policy(xp, dir, c);
2950 	case XFRM_MSG_FLUSHPOLICY:
2951 		return xfrm_notify_policy_flush(c);
2952 	case XFRM_MSG_POLEXPIRE:
2953 		return xfrm_exp_policy_notify(xp, dir, c);
2954 	default:
2955 		printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2956 		       c->event);
2957 	}
2958 
2959 	return 0;
2960 
2961 }
2962 
2963 static inline size_t xfrm_report_msgsize(void)
2964 {
2965 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2966 }
2967 
2968 static int build_report(struct sk_buff *skb, u8 proto,
2969 			struct xfrm_selector *sel, xfrm_address_t *addr)
2970 {
2971 	struct xfrm_user_report *ur;
2972 	struct nlmsghdr *nlh;
2973 
2974 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2975 	if (nlh == NULL)
2976 		return -EMSGSIZE;
2977 
2978 	ur = nlmsg_data(nlh);
2979 	ur->proto = proto;
2980 	memcpy(&ur->sel, sel, sizeof(ur->sel));
2981 
2982 	if (addr) {
2983 		int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2984 		if (err) {
2985 			nlmsg_cancel(skb, nlh);
2986 			return err;
2987 		}
2988 	}
2989 	return nlmsg_end(skb, nlh);
2990 }
2991 
2992 static int xfrm_send_report(struct net *net, u8 proto,
2993 			    struct xfrm_selector *sel, xfrm_address_t *addr)
2994 {
2995 	struct sk_buff *skb;
2996 
2997 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2998 	if (skb == NULL)
2999 		return -ENOMEM;
3000 
3001 	if (build_report(skb, proto, sel, addr) < 0)
3002 		BUG();
3003 
3004 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3005 }
3006 
3007 static inline size_t xfrm_mapping_msgsize(void)
3008 {
3009 	return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3010 }
3011 
3012 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3013 			 xfrm_address_t *new_saddr, __be16 new_sport)
3014 {
3015 	struct xfrm_user_mapping *um;
3016 	struct nlmsghdr *nlh;
3017 
3018 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3019 	if (nlh == NULL)
3020 		return -EMSGSIZE;
3021 
3022 	um = nlmsg_data(nlh);
3023 
3024 	memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3025 	um->id.spi = x->id.spi;
3026 	um->id.family = x->props.family;
3027 	um->id.proto = x->id.proto;
3028 	memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3029 	memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3030 	um->new_sport = new_sport;
3031 	um->old_sport = x->encap->encap_sport;
3032 	um->reqid = x->props.reqid;
3033 
3034 	return nlmsg_end(skb, nlh);
3035 }
3036 
3037 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3038 			     __be16 sport)
3039 {
3040 	struct net *net = xs_net(x);
3041 	struct sk_buff *skb;
3042 
3043 	if (x->id.proto != IPPROTO_ESP)
3044 		return -EINVAL;
3045 
3046 	if (!x->encap)
3047 		return -EINVAL;
3048 
3049 	skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3050 	if (skb == NULL)
3051 		return -ENOMEM;
3052 
3053 	if (build_mapping(skb, x, ipaddr, sport) < 0)
3054 		BUG();
3055 
3056 	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3057 }
3058 
3059 static bool xfrm_is_alive(const struct km_event *c)
3060 {
3061 	return (bool)xfrm_acquire_is_on(c->net);
3062 }
3063 
3064 static struct xfrm_mgr netlink_mgr = {
3065 	.id		= "netlink",
3066 	.notify		= xfrm_send_state_notify,
3067 	.acquire	= xfrm_send_acquire,
3068 	.compile_policy	= xfrm_compile_policy,
3069 	.notify_policy	= xfrm_send_policy_notify,
3070 	.report		= xfrm_send_report,
3071 	.migrate	= xfrm_send_migrate,
3072 	.new_mapping	= xfrm_send_mapping,
3073 	.is_alive	= xfrm_is_alive,
3074 };
3075 
3076 static int __net_init xfrm_user_net_init(struct net *net)
3077 {
3078 	struct sock *nlsk;
3079 	struct netlink_kernel_cfg cfg = {
3080 		.groups	= XFRMNLGRP_MAX,
3081 		.input	= xfrm_netlink_rcv,
3082 	};
3083 
3084 	nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3085 	if (nlsk == NULL)
3086 		return -ENOMEM;
3087 	net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3088 	rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3089 	return 0;
3090 }
3091 
3092 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3093 {
3094 	struct net *net;
3095 	list_for_each_entry(net, net_exit_list, exit_list)
3096 		RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3097 	synchronize_net();
3098 	list_for_each_entry(net, net_exit_list, exit_list)
3099 		netlink_kernel_release(net->xfrm.nlsk_stash);
3100 }
3101 
3102 static struct pernet_operations xfrm_user_net_ops = {
3103 	.init	    = xfrm_user_net_init,
3104 	.exit_batch = xfrm_user_net_exit,
3105 };
3106 
3107 static int __init xfrm_user_init(void)
3108 {
3109 	int rv;
3110 
3111 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
3112 
3113 	rv = register_pernet_subsys(&xfrm_user_net_ops);
3114 	if (rv < 0)
3115 		return rv;
3116 	rv = xfrm_register_km(&netlink_mgr);
3117 	if (rv < 0)
3118 		unregister_pernet_subsys(&xfrm_user_net_ops);
3119 	return rv;
3120 }
3121 
3122 static void __exit xfrm_user_exit(void)
3123 {
3124 	xfrm_unregister_km(&netlink_mgr);
3125 	unregister_pernet_subsys(&xfrm_user_net_ops);
3126 }
3127 
3128 module_init(xfrm_user_init);
3129 module_exit(xfrm_user_exit);
3130 MODULE_LICENSE("GPL");
3131 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3132 
3133