xref: /openbmc/linux/net/xfrm/xfrm_user.c (revision 9ac8d3fb)
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 <asm/uaccess.h>
30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31 #include <linux/in6.h>
32 #endif
33 
34 static inline int aead_len(struct xfrm_algo_aead *alg)
35 {
36 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
37 }
38 
39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
40 {
41 	struct nlattr *rt = attrs[type];
42 	struct xfrm_algo *algp;
43 
44 	if (!rt)
45 		return 0;
46 
47 	algp = nla_data(rt);
48 	if (nla_len(rt) < xfrm_alg_len(algp))
49 		return -EINVAL;
50 
51 	switch (type) {
52 	case XFRMA_ALG_AUTH:
53 	case XFRMA_ALG_CRYPT:
54 	case XFRMA_ALG_COMP:
55 		break;
56 
57 	default:
58 		return -EINVAL;
59 	}
60 
61 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
62 	return 0;
63 }
64 
65 static int verify_aead(struct nlattr **attrs)
66 {
67 	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
68 	struct xfrm_algo_aead *algp;
69 
70 	if (!rt)
71 		return 0;
72 
73 	algp = nla_data(rt);
74 	if (nla_len(rt) < aead_len(algp))
75 		return -EINVAL;
76 
77 	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
78 	return 0;
79 }
80 
81 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
82 			   xfrm_address_t **addrp)
83 {
84 	struct nlattr *rt = attrs[type];
85 
86 	if (rt && addrp)
87 		*addrp = nla_data(rt);
88 }
89 
90 static inline int verify_sec_ctx_len(struct nlattr **attrs)
91 {
92 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
93 	struct xfrm_user_sec_ctx *uctx;
94 
95 	if (!rt)
96 		return 0;
97 
98 	uctx = nla_data(rt);
99 	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
100 		return -EINVAL;
101 
102 	return 0;
103 }
104 
105 
106 static int verify_newsa_info(struct xfrm_usersa_info *p,
107 			     struct nlattr **attrs)
108 {
109 	int err;
110 
111 	err = -EINVAL;
112 	switch (p->family) {
113 	case AF_INET:
114 		break;
115 
116 	case AF_INET6:
117 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
118 		break;
119 #else
120 		err = -EAFNOSUPPORT;
121 		goto out;
122 #endif
123 
124 	default:
125 		goto out;
126 	}
127 
128 	err = -EINVAL;
129 	switch (p->id.proto) {
130 	case IPPROTO_AH:
131 		if (!attrs[XFRMA_ALG_AUTH]	||
132 		    attrs[XFRMA_ALG_AEAD]	||
133 		    attrs[XFRMA_ALG_CRYPT]	||
134 		    attrs[XFRMA_ALG_COMP])
135 			goto out;
136 		break;
137 
138 	case IPPROTO_ESP:
139 		if (attrs[XFRMA_ALG_COMP])
140 			goto out;
141 		if (!attrs[XFRMA_ALG_AUTH] &&
142 		    !attrs[XFRMA_ALG_CRYPT] &&
143 		    !attrs[XFRMA_ALG_AEAD])
144 			goto out;
145 		if ((attrs[XFRMA_ALG_AUTH] ||
146 		     attrs[XFRMA_ALG_CRYPT]) &&
147 		    attrs[XFRMA_ALG_AEAD])
148 			goto out;
149 		break;
150 
151 	case IPPROTO_COMP:
152 		if (!attrs[XFRMA_ALG_COMP]	||
153 		    attrs[XFRMA_ALG_AEAD]	||
154 		    attrs[XFRMA_ALG_AUTH]	||
155 		    attrs[XFRMA_ALG_CRYPT])
156 			goto out;
157 		break;
158 
159 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
160 	case IPPROTO_DSTOPTS:
161 	case IPPROTO_ROUTING:
162 		if (attrs[XFRMA_ALG_COMP]	||
163 		    attrs[XFRMA_ALG_AUTH]	||
164 		    attrs[XFRMA_ALG_AEAD]	||
165 		    attrs[XFRMA_ALG_CRYPT]	||
166 		    attrs[XFRMA_ENCAP]		||
167 		    attrs[XFRMA_SEC_CTX]	||
168 		    !attrs[XFRMA_COADDR])
169 			goto out;
170 		break;
171 #endif
172 
173 	default:
174 		goto out;
175 	}
176 
177 	if ((err = verify_aead(attrs)))
178 		goto out;
179 	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
180 		goto out;
181 	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
182 		goto out;
183 	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
184 		goto out;
185 	if ((err = verify_sec_ctx_len(attrs)))
186 		goto out;
187 
188 	err = -EINVAL;
189 	switch (p->mode) {
190 	case XFRM_MODE_TRANSPORT:
191 	case XFRM_MODE_TUNNEL:
192 	case XFRM_MODE_ROUTEOPTIMIZATION:
193 	case XFRM_MODE_BEET:
194 		break;
195 
196 	default:
197 		goto out;
198 	}
199 
200 	err = 0;
201 
202 out:
203 	return err;
204 }
205 
206 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
207 			   struct xfrm_algo_desc *(*get_byname)(char *, int),
208 			   struct nlattr *rta)
209 {
210 	struct xfrm_algo *p, *ualg;
211 	struct xfrm_algo_desc *algo;
212 
213 	if (!rta)
214 		return 0;
215 
216 	ualg = nla_data(rta);
217 
218 	algo = get_byname(ualg->alg_name, 1);
219 	if (!algo)
220 		return -ENOSYS;
221 	*props = algo->desc.sadb_alg_id;
222 
223 	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
224 	if (!p)
225 		return -ENOMEM;
226 
227 	strcpy(p->alg_name, algo->name);
228 	*algpp = p;
229 	return 0;
230 }
231 
232 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
233 		       struct nlattr *rta)
234 {
235 	struct xfrm_algo_aead *p, *ualg;
236 	struct xfrm_algo_desc *algo;
237 
238 	if (!rta)
239 		return 0;
240 
241 	ualg = nla_data(rta);
242 
243 	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
244 	if (!algo)
245 		return -ENOSYS;
246 	*props = algo->desc.sadb_alg_id;
247 
248 	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
249 	if (!p)
250 		return -ENOMEM;
251 
252 	strcpy(p->alg_name, algo->name);
253 	*algpp = p;
254 	return 0;
255 }
256 
257 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
258 {
259 	int len = 0;
260 
261 	if (xfrm_ctx) {
262 		len += sizeof(struct xfrm_user_sec_ctx);
263 		len += xfrm_ctx->ctx_len;
264 	}
265 	return len;
266 }
267 
268 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
269 {
270 	memcpy(&x->id, &p->id, sizeof(x->id));
271 	memcpy(&x->sel, &p->sel, sizeof(x->sel));
272 	memcpy(&x->lft, &p->lft, sizeof(x->lft));
273 	x->props.mode = p->mode;
274 	x->props.replay_window = p->replay_window;
275 	x->props.reqid = p->reqid;
276 	x->props.family = p->family;
277 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
278 	x->props.flags = p->flags;
279 
280 	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
281 		x->sel.family = p->family;
282 }
283 
284 /*
285  * someday when pfkey also has support, we could have the code
286  * somehow made shareable and move it to xfrm_state.c - JHS
287  *
288 */
289 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
290 {
291 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
292 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
293 	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
294 	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
295 
296 	if (rp) {
297 		struct xfrm_replay_state *replay;
298 		replay = nla_data(rp);
299 		memcpy(&x->replay, replay, sizeof(*replay));
300 		memcpy(&x->preplay, replay, sizeof(*replay));
301 	}
302 
303 	if (lt) {
304 		struct xfrm_lifetime_cur *ltime;
305 		ltime = nla_data(lt);
306 		x->curlft.bytes = ltime->bytes;
307 		x->curlft.packets = ltime->packets;
308 		x->curlft.add_time = ltime->add_time;
309 		x->curlft.use_time = ltime->use_time;
310 	}
311 
312 	if (et)
313 		x->replay_maxage = nla_get_u32(et);
314 
315 	if (rt)
316 		x->replay_maxdiff = nla_get_u32(rt);
317 }
318 
319 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
320 					       struct nlattr **attrs,
321 					       int *errp)
322 {
323 	struct xfrm_state *x = xfrm_state_alloc();
324 	int err = -ENOMEM;
325 
326 	if (!x)
327 		goto error_no_put;
328 
329 	copy_from_user_state(x, p);
330 
331 	if ((err = attach_aead(&x->aead, &x->props.ealgo,
332 			       attrs[XFRMA_ALG_AEAD])))
333 		goto error;
334 	if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
335 				   xfrm_aalg_get_byname,
336 				   attrs[XFRMA_ALG_AUTH])))
337 		goto error;
338 	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
339 				   xfrm_ealg_get_byname,
340 				   attrs[XFRMA_ALG_CRYPT])))
341 		goto error;
342 	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
343 				   xfrm_calg_get_byname,
344 				   attrs[XFRMA_ALG_COMP])))
345 		goto error;
346 
347 	if (attrs[XFRMA_ENCAP]) {
348 		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
349 				   sizeof(*x->encap), GFP_KERNEL);
350 		if (x->encap == NULL)
351 			goto error;
352 	}
353 
354 	if (attrs[XFRMA_COADDR]) {
355 		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
356 				    sizeof(*x->coaddr), GFP_KERNEL);
357 		if (x->coaddr == NULL)
358 			goto error;
359 	}
360 
361 	err = xfrm_init_state(x);
362 	if (err)
363 		goto error;
364 
365 	if (attrs[XFRMA_SEC_CTX] &&
366 	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
367 		goto error;
368 
369 	x->km.seq = p->seq;
370 	x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
371 	/* sysctl_xfrm_aevent_etime is in 100ms units */
372 	x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
373 	x->preplay.bitmap = 0;
374 	x->preplay.seq = x->replay.seq+x->replay_maxdiff;
375 	x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
376 
377 	/* override default values from above */
378 
379 	xfrm_update_ae_params(x, attrs);
380 
381 	return x;
382 
383 error:
384 	x->km.state = XFRM_STATE_DEAD;
385 	xfrm_state_put(x);
386 error_no_put:
387 	*errp = err;
388 	return NULL;
389 }
390 
391 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
392 		struct nlattr **attrs)
393 {
394 	struct xfrm_usersa_info *p = nlmsg_data(nlh);
395 	struct xfrm_state *x;
396 	int err;
397 	struct km_event c;
398 	uid_t loginuid = NETLINK_CB(skb).loginuid;
399 	u32 sessionid = NETLINK_CB(skb).sessionid;
400 	u32 sid = NETLINK_CB(skb).sid;
401 
402 	err = verify_newsa_info(p, attrs);
403 	if (err)
404 		return err;
405 
406 	x = xfrm_state_construct(p, attrs, &err);
407 	if (!x)
408 		return err;
409 
410 	xfrm_state_hold(x);
411 	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
412 		err = xfrm_state_add(x);
413 	else
414 		err = xfrm_state_update(x);
415 
416 	xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
417 
418 	if (err < 0) {
419 		x->km.state = XFRM_STATE_DEAD;
420 		__xfrm_state_put(x);
421 		goto out;
422 	}
423 
424 	c.seq = nlh->nlmsg_seq;
425 	c.pid = nlh->nlmsg_pid;
426 	c.event = nlh->nlmsg_type;
427 
428 	km_state_notify(x, &c);
429 out:
430 	xfrm_state_put(x);
431 	return err;
432 }
433 
434 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
435 						 struct nlattr **attrs,
436 						 int *errp)
437 {
438 	struct xfrm_state *x = NULL;
439 	int err;
440 
441 	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
442 		err = -ESRCH;
443 		x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
444 	} else {
445 		xfrm_address_t *saddr = NULL;
446 
447 		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
448 		if (!saddr) {
449 			err = -EINVAL;
450 			goto out;
451 		}
452 
453 		err = -ESRCH;
454 		x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
455 					     p->family);
456 	}
457 
458  out:
459 	if (!x && errp)
460 		*errp = err;
461 	return x;
462 }
463 
464 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
465 		struct nlattr **attrs)
466 {
467 	struct xfrm_state *x;
468 	int err = -ESRCH;
469 	struct km_event c;
470 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
471 	uid_t loginuid = NETLINK_CB(skb).loginuid;
472 	u32 sessionid = NETLINK_CB(skb).sessionid;
473 	u32 sid = NETLINK_CB(skb).sid;
474 
475 	x = xfrm_user_state_lookup(p, attrs, &err);
476 	if (x == NULL)
477 		return err;
478 
479 	if ((err = security_xfrm_state_delete(x)) != 0)
480 		goto out;
481 
482 	if (xfrm_state_kern(x)) {
483 		err = -EPERM;
484 		goto out;
485 	}
486 
487 	err = xfrm_state_delete(x);
488 
489 	if (err < 0)
490 		goto out;
491 
492 	c.seq = nlh->nlmsg_seq;
493 	c.pid = nlh->nlmsg_pid;
494 	c.event = nlh->nlmsg_type;
495 	km_state_notify(x, &c);
496 
497 out:
498 	xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
499 	xfrm_state_put(x);
500 	return err;
501 }
502 
503 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
504 {
505 	memcpy(&p->id, &x->id, sizeof(p->id));
506 	memcpy(&p->sel, &x->sel, sizeof(p->sel));
507 	memcpy(&p->lft, &x->lft, sizeof(p->lft));
508 	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
509 	memcpy(&p->stats, &x->stats, sizeof(p->stats));
510 	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
511 	p->mode = x->props.mode;
512 	p->replay_window = x->props.replay_window;
513 	p->reqid = x->props.reqid;
514 	p->family = x->props.family;
515 	p->flags = x->props.flags;
516 	p->seq = x->km.seq;
517 }
518 
519 struct xfrm_dump_info {
520 	struct sk_buff *in_skb;
521 	struct sk_buff *out_skb;
522 	u32 nlmsg_seq;
523 	u16 nlmsg_flags;
524 };
525 
526 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
527 {
528 	struct xfrm_user_sec_ctx *uctx;
529 	struct nlattr *attr;
530 	int ctx_size = sizeof(*uctx) + s->ctx_len;
531 
532 	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
533 	if (attr == NULL)
534 		return -EMSGSIZE;
535 
536 	uctx = nla_data(attr);
537 	uctx->exttype = XFRMA_SEC_CTX;
538 	uctx->len = ctx_size;
539 	uctx->ctx_doi = s->ctx_doi;
540 	uctx->ctx_alg = s->ctx_alg;
541 	uctx->ctx_len = s->ctx_len;
542 	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
543 
544 	return 0;
545 }
546 
547 /* Don't change this without updating xfrm_sa_len! */
548 static int copy_to_user_state_extra(struct xfrm_state *x,
549 				    struct xfrm_usersa_info *p,
550 				    struct sk_buff *skb)
551 {
552 	copy_to_user_state(x, p);
553 
554 	if (x->coaddr)
555 		NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
556 
557 	if (x->lastused)
558 		NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
559 
560 	if (x->aead)
561 		NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
562 	if (x->aalg)
563 		NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
564 	if (x->ealg)
565 		NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
566 	if (x->calg)
567 		NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
568 
569 	if (x->encap)
570 		NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
571 
572 	if (x->security && copy_sec_ctx(x->security, skb) < 0)
573 		goto nla_put_failure;
574 
575 	return 0;
576 
577 nla_put_failure:
578 	return -EMSGSIZE;
579 }
580 
581 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
582 {
583 	struct xfrm_dump_info *sp = ptr;
584 	struct sk_buff *in_skb = sp->in_skb;
585 	struct sk_buff *skb = sp->out_skb;
586 	struct xfrm_usersa_info *p;
587 	struct nlmsghdr *nlh;
588 	int err;
589 
590 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
591 			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
592 	if (nlh == NULL)
593 		return -EMSGSIZE;
594 
595 	p = nlmsg_data(nlh);
596 
597 	err = copy_to_user_state_extra(x, p, skb);
598 	if (err)
599 		goto nla_put_failure;
600 
601 	nlmsg_end(skb, nlh);
602 	return 0;
603 
604 nla_put_failure:
605 	nlmsg_cancel(skb, nlh);
606 	return err;
607 }
608 
609 static int xfrm_dump_sa_done(struct netlink_callback *cb)
610 {
611 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
612 	xfrm_state_walk_done(walk);
613 	return 0;
614 }
615 
616 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
617 {
618 	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
619 	struct xfrm_dump_info info;
620 
621 	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
622 		     sizeof(cb->args) - sizeof(cb->args[0]));
623 
624 	info.in_skb = cb->skb;
625 	info.out_skb = skb;
626 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
627 	info.nlmsg_flags = NLM_F_MULTI;
628 
629 	if (!cb->args[0]) {
630 		cb->args[0] = 1;
631 		xfrm_state_walk_init(walk, 0);
632 	}
633 
634 	(void) xfrm_state_walk(walk, dump_one_state, &info);
635 
636 	return skb->len;
637 }
638 
639 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
640 					  struct xfrm_state *x, u32 seq)
641 {
642 	struct xfrm_dump_info info;
643 	struct sk_buff *skb;
644 
645 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
646 	if (!skb)
647 		return ERR_PTR(-ENOMEM);
648 
649 	info.in_skb = in_skb;
650 	info.out_skb = skb;
651 	info.nlmsg_seq = seq;
652 	info.nlmsg_flags = 0;
653 
654 	if (dump_one_state(x, 0, &info)) {
655 		kfree_skb(skb);
656 		return NULL;
657 	}
658 
659 	return skb;
660 }
661 
662 static inline size_t xfrm_spdinfo_msgsize(void)
663 {
664 	return NLMSG_ALIGN(4)
665 	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
666 	       + nla_total_size(sizeof(struct xfrmu_spdhinfo));
667 }
668 
669 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
670 {
671 	struct xfrmk_spdinfo si;
672 	struct xfrmu_spdinfo spc;
673 	struct xfrmu_spdhinfo sph;
674 	struct nlmsghdr *nlh;
675 	u32 *f;
676 
677 	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
678 	if (nlh == NULL) /* shouldnt really happen ... */
679 		return -EMSGSIZE;
680 
681 	f = nlmsg_data(nlh);
682 	*f = flags;
683 	xfrm_spd_getinfo(&si);
684 	spc.incnt = si.incnt;
685 	spc.outcnt = si.outcnt;
686 	spc.fwdcnt = si.fwdcnt;
687 	spc.inscnt = si.inscnt;
688 	spc.outscnt = si.outscnt;
689 	spc.fwdscnt = si.fwdscnt;
690 	sph.spdhcnt = si.spdhcnt;
691 	sph.spdhmcnt = si.spdhmcnt;
692 
693 	NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
694 	NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
695 
696 	return nlmsg_end(skb, nlh);
697 
698 nla_put_failure:
699 	nlmsg_cancel(skb, nlh);
700 	return -EMSGSIZE;
701 }
702 
703 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
704 		struct nlattr **attrs)
705 {
706 	struct sk_buff *r_skb;
707 	u32 *flags = nlmsg_data(nlh);
708 	u32 spid = NETLINK_CB(skb).pid;
709 	u32 seq = nlh->nlmsg_seq;
710 
711 	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
712 	if (r_skb == NULL)
713 		return -ENOMEM;
714 
715 	if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
716 		BUG();
717 
718 	return nlmsg_unicast(xfrm_nl, r_skb, spid);
719 }
720 
721 static inline size_t xfrm_sadinfo_msgsize(void)
722 {
723 	return NLMSG_ALIGN(4)
724 	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
725 	       + nla_total_size(4); /* XFRMA_SAD_CNT */
726 }
727 
728 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
729 {
730 	struct xfrmk_sadinfo si;
731 	struct xfrmu_sadhinfo sh;
732 	struct nlmsghdr *nlh;
733 	u32 *f;
734 
735 	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
736 	if (nlh == NULL) /* shouldnt really happen ... */
737 		return -EMSGSIZE;
738 
739 	f = nlmsg_data(nlh);
740 	*f = flags;
741 	xfrm_sad_getinfo(&si);
742 
743 	sh.sadhmcnt = si.sadhmcnt;
744 	sh.sadhcnt = si.sadhcnt;
745 
746 	NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
747 	NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
748 
749 	return nlmsg_end(skb, nlh);
750 
751 nla_put_failure:
752 	nlmsg_cancel(skb, nlh);
753 	return -EMSGSIZE;
754 }
755 
756 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
757 		struct nlattr **attrs)
758 {
759 	struct sk_buff *r_skb;
760 	u32 *flags = nlmsg_data(nlh);
761 	u32 spid = NETLINK_CB(skb).pid;
762 	u32 seq = nlh->nlmsg_seq;
763 
764 	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
765 	if (r_skb == NULL)
766 		return -ENOMEM;
767 
768 	if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
769 		BUG();
770 
771 	return nlmsg_unicast(xfrm_nl, r_skb, spid);
772 }
773 
774 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
775 		struct nlattr **attrs)
776 {
777 	struct xfrm_usersa_id *p = nlmsg_data(nlh);
778 	struct xfrm_state *x;
779 	struct sk_buff *resp_skb;
780 	int err = -ESRCH;
781 
782 	x = xfrm_user_state_lookup(p, attrs, &err);
783 	if (x == NULL)
784 		goto out_noput;
785 
786 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
787 	if (IS_ERR(resp_skb)) {
788 		err = PTR_ERR(resp_skb);
789 	} else {
790 		err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
791 	}
792 	xfrm_state_put(x);
793 out_noput:
794 	return err;
795 }
796 
797 static int verify_userspi_info(struct xfrm_userspi_info *p)
798 {
799 	switch (p->info.id.proto) {
800 	case IPPROTO_AH:
801 	case IPPROTO_ESP:
802 		break;
803 
804 	case IPPROTO_COMP:
805 		/* IPCOMP spi is 16-bits. */
806 		if (p->max >= 0x10000)
807 			return -EINVAL;
808 		break;
809 
810 	default:
811 		return -EINVAL;
812 	}
813 
814 	if (p->min > p->max)
815 		return -EINVAL;
816 
817 	return 0;
818 }
819 
820 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
821 		struct nlattr **attrs)
822 {
823 	struct xfrm_state *x;
824 	struct xfrm_userspi_info *p;
825 	struct sk_buff *resp_skb;
826 	xfrm_address_t *daddr;
827 	int family;
828 	int err;
829 
830 	p = nlmsg_data(nlh);
831 	err = verify_userspi_info(p);
832 	if (err)
833 		goto out_noput;
834 
835 	family = p->info.family;
836 	daddr = &p->info.id.daddr;
837 
838 	x = NULL;
839 	if (p->info.seq) {
840 		x = xfrm_find_acq_byseq(p->info.seq);
841 		if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
842 			xfrm_state_put(x);
843 			x = NULL;
844 		}
845 	}
846 
847 	if (!x)
848 		x = xfrm_find_acq(p->info.mode, p->info.reqid,
849 				  p->info.id.proto, daddr,
850 				  &p->info.saddr, 1,
851 				  family);
852 	err = -ENOENT;
853 	if (x == NULL)
854 		goto out_noput;
855 
856 	err = xfrm_alloc_spi(x, p->min, p->max);
857 	if (err)
858 		goto out;
859 
860 	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
861 	if (IS_ERR(resp_skb)) {
862 		err = PTR_ERR(resp_skb);
863 		goto out;
864 	}
865 
866 	err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
867 
868 out:
869 	xfrm_state_put(x);
870 out_noput:
871 	return err;
872 }
873 
874 static int verify_policy_dir(u8 dir)
875 {
876 	switch (dir) {
877 	case XFRM_POLICY_IN:
878 	case XFRM_POLICY_OUT:
879 	case XFRM_POLICY_FWD:
880 		break;
881 
882 	default:
883 		return -EINVAL;
884 	}
885 
886 	return 0;
887 }
888 
889 static int verify_policy_type(u8 type)
890 {
891 	switch (type) {
892 	case XFRM_POLICY_TYPE_MAIN:
893 #ifdef CONFIG_XFRM_SUB_POLICY
894 	case XFRM_POLICY_TYPE_SUB:
895 #endif
896 		break;
897 
898 	default:
899 		return -EINVAL;
900 	}
901 
902 	return 0;
903 }
904 
905 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
906 {
907 	switch (p->share) {
908 	case XFRM_SHARE_ANY:
909 	case XFRM_SHARE_SESSION:
910 	case XFRM_SHARE_USER:
911 	case XFRM_SHARE_UNIQUE:
912 		break;
913 
914 	default:
915 		return -EINVAL;
916 	}
917 
918 	switch (p->action) {
919 	case XFRM_POLICY_ALLOW:
920 	case XFRM_POLICY_BLOCK:
921 		break;
922 
923 	default:
924 		return -EINVAL;
925 	}
926 
927 	switch (p->sel.family) {
928 	case AF_INET:
929 		break;
930 
931 	case AF_INET6:
932 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
933 		break;
934 #else
935 		return  -EAFNOSUPPORT;
936 #endif
937 
938 	default:
939 		return -EINVAL;
940 	}
941 
942 	return verify_policy_dir(p->dir);
943 }
944 
945 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
946 {
947 	struct nlattr *rt = attrs[XFRMA_SEC_CTX];
948 	struct xfrm_user_sec_ctx *uctx;
949 
950 	if (!rt)
951 		return 0;
952 
953 	uctx = nla_data(rt);
954 	return security_xfrm_policy_alloc(&pol->security, uctx);
955 }
956 
957 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
958 			   int nr)
959 {
960 	int i;
961 
962 	xp->xfrm_nr = nr;
963 	for (i = 0; i < nr; i++, ut++) {
964 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
965 
966 		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
967 		memcpy(&t->saddr, &ut->saddr,
968 		       sizeof(xfrm_address_t));
969 		t->reqid = ut->reqid;
970 		t->mode = ut->mode;
971 		t->share = ut->share;
972 		t->optional = ut->optional;
973 		t->aalgos = ut->aalgos;
974 		t->ealgos = ut->ealgos;
975 		t->calgos = ut->calgos;
976 		/* If all masks are ~0, then we allow all algorithms. */
977 		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
978 		t->encap_family = ut->family;
979 	}
980 }
981 
982 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
983 {
984 	int i;
985 
986 	if (nr > XFRM_MAX_DEPTH)
987 		return -EINVAL;
988 
989 	for (i = 0; i < nr; i++) {
990 		/* We never validated the ut->family value, so many
991 		 * applications simply leave it at zero.  The check was
992 		 * never made and ut->family was ignored because all
993 		 * templates could be assumed to have the same family as
994 		 * the policy itself.  Now that we will have ipv4-in-ipv6
995 		 * and ipv6-in-ipv4 tunnels, this is no longer true.
996 		 */
997 		if (!ut[i].family)
998 			ut[i].family = family;
999 
1000 		switch (ut[i].family) {
1001 		case AF_INET:
1002 			break;
1003 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1004 		case AF_INET6:
1005 			break;
1006 #endif
1007 		default:
1008 			return -EINVAL;
1009 		}
1010 	}
1011 
1012 	return 0;
1013 }
1014 
1015 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1016 {
1017 	struct nlattr *rt = attrs[XFRMA_TMPL];
1018 
1019 	if (!rt) {
1020 		pol->xfrm_nr = 0;
1021 	} else {
1022 		struct xfrm_user_tmpl *utmpl = nla_data(rt);
1023 		int nr = nla_len(rt) / sizeof(*utmpl);
1024 		int err;
1025 
1026 		err = validate_tmpl(nr, utmpl, pol->family);
1027 		if (err)
1028 			return err;
1029 
1030 		copy_templates(pol, utmpl, nr);
1031 	}
1032 	return 0;
1033 }
1034 
1035 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1036 {
1037 	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1038 	struct xfrm_userpolicy_type *upt;
1039 	u8 type = XFRM_POLICY_TYPE_MAIN;
1040 	int err;
1041 
1042 	if (rt) {
1043 		upt = nla_data(rt);
1044 		type = upt->type;
1045 	}
1046 
1047 	err = verify_policy_type(type);
1048 	if (err)
1049 		return err;
1050 
1051 	*tp = type;
1052 	return 0;
1053 }
1054 
1055 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1056 {
1057 	xp->priority = p->priority;
1058 	xp->index = p->index;
1059 	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1060 	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1061 	xp->action = p->action;
1062 	xp->flags = p->flags;
1063 	xp->family = p->sel.family;
1064 	/* XXX xp->share = p->share; */
1065 }
1066 
1067 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1068 {
1069 	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1070 	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1071 	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1072 	p->priority = xp->priority;
1073 	p->index = xp->index;
1074 	p->sel.family = xp->family;
1075 	p->dir = dir;
1076 	p->action = xp->action;
1077 	p->flags = xp->flags;
1078 	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1079 }
1080 
1081 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1082 {
1083 	struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1084 	int err;
1085 
1086 	if (!xp) {
1087 		*errp = -ENOMEM;
1088 		return NULL;
1089 	}
1090 
1091 	copy_from_user_policy(xp, p);
1092 
1093 	err = copy_from_user_policy_type(&xp->type, attrs);
1094 	if (err)
1095 		goto error;
1096 
1097 	if (!(err = copy_from_user_tmpl(xp, attrs)))
1098 		err = copy_from_user_sec_ctx(xp, attrs);
1099 	if (err)
1100 		goto error;
1101 
1102 	return xp;
1103  error:
1104 	*errp = err;
1105 	xp->walk.dead = 1;
1106 	xfrm_policy_destroy(xp);
1107 	return NULL;
1108 }
1109 
1110 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1111 		struct nlattr **attrs)
1112 {
1113 	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1114 	struct xfrm_policy *xp;
1115 	struct km_event c;
1116 	int err;
1117 	int excl;
1118 	uid_t loginuid = NETLINK_CB(skb).loginuid;
1119 	u32 sessionid = NETLINK_CB(skb).sessionid;
1120 	u32 sid = NETLINK_CB(skb).sid;
1121 
1122 	err = verify_newpolicy_info(p);
1123 	if (err)
1124 		return err;
1125 	err = verify_sec_ctx_len(attrs);
1126 	if (err)
1127 		return err;
1128 
1129 	xp = xfrm_policy_construct(p, attrs, &err);
1130 	if (!xp)
1131 		return err;
1132 
1133 	/* shouldnt excl be based on nlh flags??
1134 	 * Aha! this is anti-netlink really i.e  more pfkey derived
1135 	 * in netlink excl is a flag and you wouldnt need
1136 	 * a type XFRM_MSG_UPDPOLICY - JHS */
1137 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1138 	err = xfrm_policy_insert(p->dir, xp, excl);
1139 	xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1140 
1141 	if (err) {
1142 		security_xfrm_policy_free(xp->security);
1143 		kfree(xp);
1144 		return err;
1145 	}
1146 
1147 	c.event = nlh->nlmsg_type;
1148 	c.seq = nlh->nlmsg_seq;
1149 	c.pid = nlh->nlmsg_pid;
1150 	km_policy_notify(xp, p->dir, &c);
1151 
1152 	xfrm_pol_put(xp);
1153 
1154 	return 0;
1155 }
1156 
1157 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1158 {
1159 	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1160 	int i;
1161 
1162 	if (xp->xfrm_nr == 0)
1163 		return 0;
1164 
1165 	for (i = 0; i < xp->xfrm_nr; i++) {
1166 		struct xfrm_user_tmpl *up = &vec[i];
1167 		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1168 
1169 		memcpy(&up->id, &kp->id, sizeof(up->id));
1170 		up->family = kp->encap_family;
1171 		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1172 		up->reqid = kp->reqid;
1173 		up->mode = kp->mode;
1174 		up->share = kp->share;
1175 		up->optional = kp->optional;
1176 		up->aalgos = kp->aalgos;
1177 		up->ealgos = kp->ealgos;
1178 		up->calgos = kp->calgos;
1179 	}
1180 
1181 	return nla_put(skb, XFRMA_TMPL,
1182 		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1183 }
1184 
1185 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1186 {
1187 	if (x->security) {
1188 		return copy_sec_ctx(x->security, skb);
1189 	}
1190 	return 0;
1191 }
1192 
1193 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1194 {
1195 	if (xp->security) {
1196 		return copy_sec_ctx(xp->security, skb);
1197 	}
1198 	return 0;
1199 }
1200 static inline size_t userpolicy_type_attrsize(void)
1201 {
1202 #ifdef CONFIG_XFRM_SUB_POLICY
1203 	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1204 #else
1205 	return 0;
1206 #endif
1207 }
1208 
1209 #ifdef CONFIG_XFRM_SUB_POLICY
1210 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1211 {
1212 	struct xfrm_userpolicy_type upt = {
1213 		.type = type,
1214 	};
1215 
1216 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1217 }
1218 
1219 #else
1220 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1221 {
1222 	return 0;
1223 }
1224 #endif
1225 
1226 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1227 {
1228 	struct xfrm_dump_info *sp = ptr;
1229 	struct xfrm_userpolicy_info *p;
1230 	struct sk_buff *in_skb = sp->in_skb;
1231 	struct sk_buff *skb = sp->out_skb;
1232 	struct nlmsghdr *nlh;
1233 
1234 	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1235 			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1236 	if (nlh == NULL)
1237 		return -EMSGSIZE;
1238 
1239 	p = nlmsg_data(nlh);
1240 	copy_to_user_policy(xp, p, dir);
1241 	if (copy_to_user_tmpl(xp, skb) < 0)
1242 		goto nlmsg_failure;
1243 	if (copy_to_user_sec_ctx(xp, skb))
1244 		goto nlmsg_failure;
1245 	if (copy_to_user_policy_type(xp->type, skb) < 0)
1246 		goto nlmsg_failure;
1247 
1248 	nlmsg_end(skb, nlh);
1249 	return 0;
1250 
1251 nlmsg_failure:
1252 	nlmsg_cancel(skb, nlh);
1253 	return -EMSGSIZE;
1254 }
1255 
1256 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1257 {
1258 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1259 
1260 	xfrm_policy_walk_done(walk);
1261 	return 0;
1262 }
1263 
1264 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1265 {
1266 	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1267 	struct xfrm_dump_info info;
1268 
1269 	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1270 		     sizeof(cb->args) - sizeof(cb->args[0]));
1271 
1272 	info.in_skb = cb->skb;
1273 	info.out_skb = skb;
1274 	info.nlmsg_seq = cb->nlh->nlmsg_seq;
1275 	info.nlmsg_flags = NLM_F_MULTI;
1276 
1277 	if (!cb->args[0]) {
1278 		cb->args[0] = 1;
1279 		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1280 	}
1281 
1282 	(void) xfrm_policy_walk(walk, dump_one_policy, &info);
1283 
1284 	return skb->len;
1285 }
1286 
1287 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1288 					  struct xfrm_policy *xp,
1289 					  int dir, u32 seq)
1290 {
1291 	struct xfrm_dump_info info;
1292 	struct sk_buff *skb;
1293 
1294 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1295 	if (!skb)
1296 		return ERR_PTR(-ENOMEM);
1297 
1298 	info.in_skb = in_skb;
1299 	info.out_skb = skb;
1300 	info.nlmsg_seq = seq;
1301 	info.nlmsg_flags = 0;
1302 
1303 	if (dump_one_policy(xp, dir, 0, &info) < 0) {
1304 		kfree_skb(skb);
1305 		return NULL;
1306 	}
1307 
1308 	return skb;
1309 }
1310 
1311 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1312 		struct nlattr **attrs)
1313 {
1314 	struct xfrm_policy *xp;
1315 	struct xfrm_userpolicy_id *p;
1316 	u8 type = XFRM_POLICY_TYPE_MAIN;
1317 	int err;
1318 	struct km_event c;
1319 	int delete;
1320 
1321 	p = nlmsg_data(nlh);
1322 	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1323 
1324 	err = copy_from_user_policy_type(&type, attrs);
1325 	if (err)
1326 		return err;
1327 
1328 	err = verify_policy_dir(p->dir);
1329 	if (err)
1330 		return err;
1331 
1332 	if (p->index)
1333 		xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1334 	else {
1335 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1336 		struct xfrm_sec_ctx *ctx;
1337 
1338 		err = verify_sec_ctx_len(attrs);
1339 		if (err)
1340 			return err;
1341 
1342 		ctx = NULL;
1343 		if (rt) {
1344 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1345 
1346 			err = security_xfrm_policy_alloc(&ctx, uctx);
1347 			if (err)
1348 				return err;
1349 		}
1350 		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx,
1351 					   delete, &err);
1352 		security_xfrm_policy_free(ctx);
1353 	}
1354 	if (xp == NULL)
1355 		return -ENOENT;
1356 
1357 	if (!delete) {
1358 		struct sk_buff *resp_skb;
1359 
1360 		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1361 		if (IS_ERR(resp_skb)) {
1362 			err = PTR_ERR(resp_skb);
1363 		} else {
1364 			err = nlmsg_unicast(xfrm_nl, resp_skb,
1365 					    NETLINK_CB(skb).pid);
1366 		}
1367 	} else {
1368 		uid_t loginuid = NETLINK_CB(skb).loginuid;
1369 		u32 sessionid = NETLINK_CB(skb).sessionid;
1370 		u32 sid = NETLINK_CB(skb).sid;
1371 
1372 		xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1373 					 sid);
1374 
1375 		if (err != 0)
1376 			goto out;
1377 
1378 		c.data.byid = p->index;
1379 		c.event = nlh->nlmsg_type;
1380 		c.seq = nlh->nlmsg_seq;
1381 		c.pid = nlh->nlmsg_pid;
1382 		km_policy_notify(xp, p->dir, &c);
1383 	}
1384 
1385 out:
1386 	xfrm_pol_put(xp);
1387 	return err;
1388 }
1389 
1390 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1391 		struct nlattr **attrs)
1392 {
1393 	struct km_event c;
1394 	struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1395 	struct xfrm_audit audit_info;
1396 	int err;
1397 
1398 	audit_info.loginuid = NETLINK_CB(skb).loginuid;
1399 	audit_info.sessionid = NETLINK_CB(skb).sessionid;
1400 	audit_info.secid = NETLINK_CB(skb).sid;
1401 	err = xfrm_state_flush(p->proto, &audit_info);
1402 	if (err)
1403 		return err;
1404 	c.data.proto = p->proto;
1405 	c.event = nlh->nlmsg_type;
1406 	c.seq = nlh->nlmsg_seq;
1407 	c.pid = nlh->nlmsg_pid;
1408 	km_state_notify(NULL, &c);
1409 
1410 	return 0;
1411 }
1412 
1413 static inline size_t xfrm_aevent_msgsize(void)
1414 {
1415 	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1416 	       + nla_total_size(sizeof(struct xfrm_replay_state))
1417 	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1418 	       + nla_total_size(4) /* XFRM_AE_RTHR */
1419 	       + nla_total_size(4); /* XFRM_AE_ETHR */
1420 }
1421 
1422 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1423 {
1424 	struct xfrm_aevent_id *id;
1425 	struct nlmsghdr *nlh;
1426 
1427 	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1428 	if (nlh == NULL)
1429 		return -EMSGSIZE;
1430 
1431 	id = nlmsg_data(nlh);
1432 	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1433 	id->sa_id.spi = x->id.spi;
1434 	id->sa_id.family = x->props.family;
1435 	id->sa_id.proto = x->id.proto;
1436 	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1437 	id->reqid = x->props.reqid;
1438 	id->flags = c->data.aevent;
1439 
1440 	NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1441 	NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1442 
1443 	if (id->flags & XFRM_AE_RTHR)
1444 		NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1445 
1446 	if (id->flags & XFRM_AE_ETHR)
1447 		NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1448 			    x->replay_maxage * 10 / HZ);
1449 
1450 	return nlmsg_end(skb, nlh);
1451 
1452 nla_put_failure:
1453 	nlmsg_cancel(skb, nlh);
1454 	return -EMSGSIZE;
1455 }
1456 
1457 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1458 		struct nlattr **attrs)
1459 {
1460 	struct xfrm_state *x;
1461 	struct sk_buff *r_skb;
1462 	int err;
1463 	struct km_event c;
1464 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1465 	struct xfrm_usersa_id *id = &p->sa_id;
1466 
1467 	r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1468 	if (r_skb == NULL)
1469 		return -ENOMEM;
1470 
1471 	x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1472 	if (x == NULL) {
1473 		kfree_skb(r_skb);
1474 		return -ESRCH;
1475 	}
1476 
1477 	/*
1478 	 * XXX: is this lock really needed - none of the other
1479 	 * gets lock (the concern is things getting updated
1480 	 * while we are still reading) - jhs
1481 	*/
1482 	spin_lock_bh(&x->lock);
1483 	c.data.aevent = p->flags;
1484 	c.seq = nlh->nlmsg_seq;
1485 	c.pid = nlh->nlmsg_pid;
1486 
1487 	if (build_aevent(r_skb, x, &c) < 0)
1488 		BUG();
1489 	err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1490 	spin_unlock_bh(&x->lock);
1491 	xfrm_state_put(x);
1492 	return err;
1493 }
1494 
1495 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1496 		struct nlattr **attrs)
1497 {
1498 	struct xfrm_state *x;
1499 	struct km_event c;
1500 	int err = - EINVAL;
1501 	struct xfrm_aevent_id *p = nlmsg_data(nlh);
1502 	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1503 	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1504 
1505 	if (!lt && !rp)
1506 		return err;
1507 
1508 	/* pedantic mode - thou shalt sayeth replaceth */
1509 	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1510 		return err;
1511 
1512 	x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1513 	if (x == NULL)
1514 		return -ESRCH;
1515 
1516 	if (x->km.state != XFRM_STATE_VALID)
1517 		goto out;
1518 
1519 	spin_lock_bh(&x->lock);
1520 	xfrm_update_ae_params(x, attrs);
1521 	spin_unlock_bh(&x->lock);
1522 
1523 	c.event = nlh->nlmsg_type;
1524 	c.seq = nlh->nlmsg_seq;
1525 	c.pid = nlh->nlmsg_pid;
1526 	c.data.aevent = XFRM_AE_CU;
1527 	km_state_notify(x, &c);
1528 	err = 0;
1529 out:
1530 	xfrm_state_put(x);
1531 	return err;
1532 }
1533 
1534 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1535 		struct nlattr **attrs)
1536 {
1537 	struct km_event c;
1538 	u8 type = XFRM_POLICY_TYPE_MAIN;
1539 	int err;
1540 	struct xfrm_audit audit_info;
1541 
1542 	err = copy_from_user_policy_type(&type, attrs);
1543 	if (err)
1544 		return err;
1545 
1546 	audit_info.loginuid = NETLINK_CB(skb).loginuid;
1547 	audit_info.sessionid = NETLINK_CB(skb).sessionid;
1548 	audit_info.secid = NETLINK_CB(skb).sid;
1549 	err = xfrm_policy_flush(type, &audit_info);
1550 	if (err)
1551 		return err;
1552 	c.data.type = type;
1553 	c.event = nlh->nlmsg_type;
1554 	c.seq = nlh->nlmsg_seq;
1555 	c.pid = nlh->nlmsg_pid;
1556 	km_policy_notify(NULL, 0, &c);
1557 	return 0;
1558 }
1559 
1560 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1561 		struct nlattr **attrs)
1562 {
1563 	struct xfrm_policy *xp;
1564 	struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1565 	struct xfrm_userpolicy_info *p = &up->pol;
1566 	u8 type = XFRM_POLICY_TYPE_MAIN;
1567 	int err = -ENOENT;
1568 
1569 	err = copy_from_user_policy_type(&type, attrs);
1570 	if (err)
1571 		return err;
1572 
1573 	if (p->index)
1574 		xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1575 	else {
1576 		struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1577 		struct xfrm_sec_ctx *ctx;
1578 
1579 		err = verify_sec_ctx_len(attrs);
1580 		if (err)
1581 			return err;
1582 
1583 		ctx = NULL;
1584 		if (rt) {
1585 			struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1586 
1587 			err = security_xfrm_policy_alloc(&ctx, uctx);
1588 			if (err)
1589 				return err;
1590 		}
1591 		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 0, &err);
1592 		security_xfrm_policy_free(ctx);
1593 	}
1594 	if (xp == NULL)
1595 		return -ENOENT;
1596 
1597 	read_lock(&xp->lock);
1598 	if (xp->walk.dead) {
1599 		read_unlock(&xp->lock);
1600 		goto out;
1601 	}
1602 
1603 	read_unlock(&xp->lock);
1604 	err = 0;
1605 	if (up->hard) {
1606 		uid_t loginuid = NETLINK_CB(skb).loginuid;
1607 		uid_t sessionid = NETLINK_CB(skb).sessionid;
1608 		u32 sid = NETLINK_CB(skb).sid;
1609 		xfrm_policy_delete(xp, p->dir);
1610 		xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1611 
1612 	} else {
1613 		// reset the timers here?
1614 		printk("Dont know what to do with soft policy expire\n");
1615 	}
1616 	km_policy_expired(xp, p->dir, up->hard, current->pid);
1617 
1618 out:
1619 	xfrm_pol_put(xp);
1620 	return err;
1621 }
1622 
1623 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1624 		struct nlattr **attrs)
1625 {
1626 	struct xfrm_state *x;
1627 	int err;
1628 	struct xfrm_user_expire *ue = nlmsg_data(nlh);
1629 	struct xfrm_usersa_info *p = &ue->state;
1630 
1631 	x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1632 
1633 	err = -ENOENT;
1634 	if (x == NULL)
1635 		return err;
1636 
1637 	spin_lock_bh(&x->lock);
1638 	err = -EINVAL;
1639 	if (x->km.state != XFRM_STATE_VALID)
1640 		goto out;
1641 	km_state_expired(x, ue->hard, current->pid);
1642 
1643 	if (ue->hard) {
1644 		uid_t loginuid = NETLINK_CB(skb).loginuid;
1645 		uid_t sessionid = NETLINK_CB(skb).sessionid;
1646 		u32 sid = NETLINK_CB(skb).sid;
1647 		__xfrm_state_delete(x);
1648 		xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1649 	}
1650 	err = 0;
1651 out:
1652 	spin_unlock_bh(&x->lock);
1653 	xfrm_state_put(x);
1654 	return err;
1655 }
1656 
1657 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1658 		struct nlattr **attrs)
1659 {
1660 	struct xfrm_policy *xp;
1661 	struct xfrm_user_tmpl *ut;
1662 	int i;
1663 	struct nlattr *rt = attrs[XFRMA_TMPL];
1664 
1665 	struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1666 	struct xfrm_state *x = xfrm_state_alloc();
1667 	int err = -ENOMEM;
1668 
1669 	if (!x)
1670 		return err;
1671 
1672 	err = verify_newpolicy_info(&ua->policy);
1673 	if (err) {
1674 		printk("BAD policy passed\n");
1675 		kfree(x);
1676 		return err;
1677 	}
1678 
1679 	/*   build an XP */
1680 	xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1681 	if (!xp) {
1682 		kfree(x);
1683 		return err;
1684 	}
1685 
1686 	memcpy(&x->id, &ua->id, sizeof(ua->id));
1687 	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1688 	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1689 
1690 	ut = nla_data(rt);
1691 	/* extract the templates and for each call km_key */
1692 	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1693 		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1694 		memcpy(&x->id, &t->id, sizeof(x->id));
1695 		x->props.mode = t->mode;
1696 		x->props.reqid = t->reqid;
1697 		x->props.family = ut->family;
1698 		t->aalgos = ua->aalgos;
1699 		t->ealgos = ua->ealgos;
1700 		t->calgos = ua->calgos;
1701 		err = km_query(x, t, xp);
1702 
1703 	}
1704 
1705 	kfree(x);
1706 	kfree(xp);
1707 
1708 	return 0;
1709 }
1710 
1711 #ifdef CONFIG_XFRM_MIGRATE
1712 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1713 				  struct xfrm_kmaddress *k,
1714 				  struct nlattr **attrs, int *num)
1715 {
1716 	struct nlattr *rt = attrs[XFRMA_MIGRATE];
1717 	struct xfrm_user_migrate *um;
1718 	int i, num_migrate;
1719 
1720 	if (k != NULL) {
1721 		struct xfrm_user_kmaddress *uk;
1722 
1723 		uk = nla_data(attrs[XFRMA_KMADDRESS]);
1724 		memcpy(&k->local, &uk->local, sizeof(k->local));
1725 		memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1726 		k->family = uk->family;
1727 		k->reserved = uk->reserved;
1728 	}
1729 
1730 	um = nla_data(rt);
1731 	num_migrate = nla_len(rt) / sizeof(*um);
1732 
1733 	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1734 		return -EINVAL;
1735 
1736 	for (i = 0; i < num_migrate; i++, um++, ma++) {
1737 		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1738 		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1739 		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1740 		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1741 
1742 		ma->proto = um->proto;
1743 		ma->mode = um->mode;
1744 		ma->reqid = um->reqid;
1745 
1746 		ma->old_family = um->old_family;
1747 		ma->new_family = um->new_family;
1748 	}
1749 
1750 	*num = i;
1751 	return 0;
1752 }
1753 
1754 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1755 			   struct nlattr **attrs)
1756 {
1757 	struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1758 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
1759 	struct xfrm_kmaddress km, *kmp;
1760 	u8 type;
1761 	int err;
1762 	int n = 0;
1763 
1764 	if (attrs[XFRMA_MIGRATE] == NULL)
1765 		return -EINVAL;
1766 
1767 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1768 
1769 	err = copy_from_user_policy_type(&type, attrs);
1770 	if (err)
1771 		return err;
1772 
1773 	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
1774 	if (err)
1775 		return err;
1776 
1777 	if (!n)
1778 		return 0;
1779 
1780 	xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
1781 
1782 	return 0;
1783 }
1784 #else
1785 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1786 			   struct nlattr **attrs)
1787 {
1788 	return -ENOPROTOOPT;
1789 }
1790 #endif
1791 
1792 #ifdef CONFIG_XFRM_MIGRATE
1793 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1794 {
1795 	struct xfrm_user_migrate um;
1796 
1797 	memset(&um, 0, sizeof(um));
1798 	um.proto = m->proto;
1799 	um.mode = m->mode;
1800 	um.reqid = m->reqid;
1801 	um.old_family = m->old_family;
1802 	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1803 	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1804 	um.new_family = m->new_family;
1805 	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1806 	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1807 
1808 	return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1809 }
1810 
1811 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
1812 {
1813 	struct xfrm_user_kmaddress uk;
1814 
1815 	memset(&uk, 0, sizeof(uk));
1816 	uk.family = k->family;
1817 	uk.reserved = k->reserved;
1818 	memcpy(&uk.local, &k->local, sizeof(uk.local));
1819 	memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
1820 
1821 	return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
1822 }
1823 
1824 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
1825 {
1826 	return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1827 	      + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
1828 	      + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1829 	      + userpolicy_type_attrsize();
1830 }
1831 
1832 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1833 			 int num_migrate, struct xfrm_kmaddress *k,
1834 			 struct xfrm_selector *sel, u8 dir, u8 type)
1835 {
1836 	struct xfrm_migrate *mp;
1837 	struct xfrm_userpolicy_id *pol_id;
1838 	struct nlmsghdr *nlh;
1839 	int i;
1840 
1841 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1842 	if (nlh == NULL)
1843 		return -EMSGSIZE;
1844 
1845 	pol_id = nlmsg_data(nlh);
1846 	/* copy data from selector, dir, and type to the pol_id */
1847 	memset(pol_id, 0, sizeof(*pol_id));
1848 	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1849 	pol_id->dir = dir;
1850 
1851 	if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
1852 			goto nlmsg_failure;
1853 
1854 	if (copy_to_user_policy_type(type, skb) < 0)
1855 		goto nlmsg_failure;
1856 
1857 	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1858 		if (copy_to_user_migrate(mp, skb) < 0)
1859 			goto nlmsg_failure;
1860 	}
1861 
1862 	return nlmsg_end(skb, nlh);
1863 nlmsg_failure:
1864 	nlmsg_cancel(skb, nlh);
1865 	return -EMSGSIZE;
1866 }
1867 
1868 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1869 			     struct xfrm_migrate *m, int num_migrate,
1870 			     struct xfrm_kmaddress *k)
1871 {
1872 	struct sk_buff *skb;
1873 
1874 	skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
1875 	if (skb == NULL)
1876 		return -ENOMEM;
1877 
1878 	/* build migrate */
1879 	if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
1880 		BUG();
1881 
1882 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1883 }
1884 #else
1885 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1886 			     struct xfrm_migrate *m, int num_migrate,
1887 			     struct xfrm_kmaddress *k)
1888 {
1889 	return -ENOPROTOOPT;
1890 }
1891 #endif
1892 
1893 #define XMSGSIZE(type) sizeof(struct type)
1894 
1895 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1896 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1897 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1898 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1899 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1900 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1901 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1902 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1903 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1904 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1905 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1906 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1907 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1908 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1909 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1910 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1911 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1912 	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1913 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1914 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
1915 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
1916 };
1917 
1918 #undef XMSGSIZE
1919 
1920 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1921 	[XFRMA_ALG_AEAD]	= { .len = sizeof(struct xfrm_algo_aead) },
1922 	[XFRMA_ALG_AUTH]	= { .len = sizeof(struct xfrm_algo) },
1923 	[XFRMA_ALG_CRYPT]	= { .len = sizeof(struct xfrm_algo) },
1924 	[XFRMA_ALG_COMP]	= { .len = sizeof(struct xfrm_algo) },
1925 	[XFRMA_ENCAP]		= { .len = sizeof(struct xfrm_encap_tmpl) },
1926 	[XFRMA_TMPL]		= { .len = sizeof(struct xfrm_user_tmpl) },
1927 	[XFRMA_SEC_CTX]		= { .len = sizeof(struct xfrm_sec_ctx) },
1928 	[XFRMA_LTIME_VAL]	= { .len = sizeof(struct xfrm_lifetime_cur) },
1929 	[XFRMA_REPLAY_VAL]	= { .len = sizeof(struct xfrm_replay_state) },
1930 	[XFRMA_REPLAY_THRESH]	= { .type = NLA_U32 },
1931 	[XFRMA_ETIMER_THRESH]	= { .type = NLA_U32 },
1932 	[XFRMA_SRCADDR]		= { .len = sizeof(xfrm_address_t) },
1933 	[XFRMA_COADDR]		= { .len = sizeof(xfrm_address_t) },
1934 	[XFRMA_POLICY_TYPE]	= { .len = sizeof(struct xfrm_userpolicy_type)},
1935 	[XFRMA_MIGRATE]		= { .len = sizeof(struct xfrm_user_migrate) },
1936 	[XFRMA_KMADDRESS]	= { .len = sizeof(struct xfrm_user_kmaddress) },
1937 };
1938 
1939 static struct xfrm_link {
1940 	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1941 	int (*dump)(struct sk_buff *, struct netlink_callback *);
1942 	int (*done)(struct netlink_callback *);
1943 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1944 	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
1945 	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
1946 	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1947 						   .dump = xfrm_dump_sa,
1948 						   .done = xfrm_dump_sa_done  },
1949 	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
1950 	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
1951 	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1952 						   .dump = xfrm_dump_policy,
1953 						   .done = xfrm_dump_policy_done },
1954 	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1955 	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
1956 	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1957 	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
1958 	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
1959 	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1960 	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
1961 	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
1962 	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
1963 	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
1964 	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
1965 	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
1966 	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
1967 };
1968 
1969 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1970 {
1971 	struct nlattr *attrs[XFRMA_MAX+1];
1972 	struct xfrm_link *link;
1973 	int type, err;
1974 
1975 	type = nlh->nlmsg_type;
1976 	if (type > XFRM_MSG_MAX)
1977 		return -EINVAL;
1978 
1979 	type -= XFRM_MSG_BASE;
1980 	link = &xfrm_dispatch[type];
1981 
1982 	/* All operations require privileges, even GET */
1983 	if (security_netlink_recv(skb, CAP_NET_ADMIN))
1984 		return -EPERM;
1985 
1986 	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1987 	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1988 	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
1989 		if (link->dump == NULL)
1990 			return -EINVAL;
1991 
1992 		return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1993 	}
1994 
1995 	err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1996 			  xfrma_policy);
1997 	if (err < 0)
1998 		return err;
1999 
2000 	if (link->doit == NULL)
2001 		return -EINVAL;
2002 
2003 	return link->doit(skb, nlh, attrs);
2004 }
2005 
2006 static void xfrm_netlink_rcv(struct sk_buff *skb)
2007 {
2008 	mutex_lock(&xfrm_cfg_mutex);
2009 	netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2010 	mutex_unlock(&xfrm_cfg_mutex);
2011 }
2012 
2013 static inline size_t xfrm_expire_msgsize(void)
2014 {
2015 	return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
2016 }
2017 
2018 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2019 {
2020 	struct xfrm_user_expire *ue;
2021 	struct nlmsghdr *nlh;
2022 
2023 	nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2024 	if (nlh == NULL)
2025 		return -EMSGSIZE;
2026 
2027 	ue = nlmsg_data(nlh);
2028 	copy_to_user_state(x, &ue->state);
2029 	ue->hard = (c->data.hard != 0) ? 1 : 0;
2030 
2031 	return nlmsg_end(skb, nlh);
2032 }
2033 
2034 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2035 {
2036 	struct sk_buff *skb;
2037 
2038 	skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2039 	if (skb == NULL)
2040 		return -ENOMEM;
2041 
2042 	if (build_expire(skb, x, c) < 0)
2043 		BUG();
2044 
2045 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2046 }
2047 
2048 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2049 {
2050 	struct sk_buff *skb;
2051 
2052 	skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2053 	if (skb == NULL)
2054 		return -ENOMEM;
2055 
2056 	if (build_aevent(skb, x, c) < 0)
2057 		BUG();
2058 
2059 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2060 }
2061 
2062 static int xfrm_notify_sa_flush(struct km_event *c)
2063 {
2064 	struct xfrm_usersa_flush *p;
2065 	struct nlmsghdr *nlh;
2066 	struct sk_buff *skb;
2067 	int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2068 
2069 	skb = nlmsg_new(len, GFP_ATOMIC);
2070 	if (skb == NULL)
2071 		return -ENOMEM;
2072 
2073 	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2074 	if (nlh == NULL) {
2075 		kfree_skb(skb);
2076 		return -EMSGSIZE;
2077 	}
2078 
2079 	p = nlmsg_data(nlh);
2080 	p->proto = c->data.proto;
2081 
2082 	nlmsg_end(skb, nlh);
2083 
2084 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2085 }
2086 
2087 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2088 {
2089 	size_t l = 0;
2090 	if (x->aead)
2091 		l += nla_total_size(aead_len(x->aead));
2092 	if (x->aalg)
2093 		l += nla_total_size(xfrm_alg_len(x->aalg));
2094 	if (x->ealg)
2095 		l += nla_total_size(xfrm_alg_len(x->ealg));
2096 	if (x->calg)
2097 		l += nla_total_size(sizeof(*x->calg));
2098 	if (x->encap)
2099 		l += nla_total_size(sizeof(*x->encap));
2100 	if (x->security)
2101 		l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2102 				    x->security->ctx_len);
2103 	if (x->coaddr)
2104 		l += nla_total_size(sizeof(*x->coaddr));
2105 
2106 	/* Must count x->lastused as it may become non-zero behind our back. */
2107 	l += nla_total_size(sizeof(u64));
2108 
2109 	return l;
2110 }
2111 
2112 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2113 {
2114 	struct xfrm_usersa_info *p;
2115 	struct xfrm_usersa_id *id;
2116 	struct nlmsghdr *nlh;
2117 	struct sk_buff *skb;
2118 	int len = xfrm_sa_len(x);
2119 	int headlen;
2120 
2121 	headlen = sizeof(*p);
2122 	if (c->event == XFRM_MSG_DELSA) {
2123 		len += nla_total_size(headlen);
2124 		headlen = sizeof(*id);
2125 	}
2126 	len += NLMSG_ALIGN(headlen);
2127 
2128 	skb = nlmsg_new(len, GFP_ATOMIC);
2129 	if (skb == NULL)
2130 		return -ENOMEM;
2131 
2132 	nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2133 	if (nlh == NULL)
2134 		goto nla_put_failure;
2135 
2136 	p = nlmsg_data(nlh);
2137 	if (c->event == XFRM_MSG_DELSA) {
2138 		struct nlattr *attr;
2139 
2140 		id = nlmsg_data(nlh);
2141 		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2142 		id->spi = x->id.spi;
2143 		id->family = x->props.family;
2144 		id->proto = x->id.proto;
2145 
2146 		attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2147 		if (attr == NULL)
2148 			goto nla_put_failure;
2149 
2150 		p = nla_data(attr);
2151 	}
2152 
2153 	if (copy_to_user_state_extra(x, p, skb))
2154 		goto nla_put_failure;
2155 
2156 	nlmsg_end(skb, nlh);
2157 
2158 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2159 
2160 nla_put_failure:
2161 	/* Somebody screwed up with xfrm_sa_len! */
2162 	WARN_ON(1);
2163 	kfree_skb(skb);
2164 	return -1;
2165 }
2166 
2167 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2168 {
2169 
2170 	switch (c->event) {
2171 	case XFRM_MSG_EXPIRE:
2172 		return xfrm_exp_state_notify(x, c);
2173 	case XFRM_MSG_NEWAE:
2174 		return xfrm_aevent_state_notify(x, c);
2175 	case XFRM_MSG_DELSA:
2176 	case XFRM_MSG_UPDSA:
2177 	case XFRM_MSG_NEWSA:
2178 		return xfrm_notify_sa(x, c);
2179 	case XFRM_MSG_FLUSHSA:
2180 		return xfrm_notify_sa_flush(c);
2181 	default:
2182 		 printk("xfrm_user: Unknown SA event %d\n", c->event);
2183 		 break;
2184 	}
2185 
2186 	return 0;
2187 
2188 }
2189 
2190 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2191 					  struct xfrm_policy *xp)
2192 {
2193 	return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2194 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2195 	       + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2196 	       + userpolicy_type_attrsize();
2197 }
2198 
2199 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2200 			 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2201 			 int dir)
2202 {
2203 	struct xfrm_user_acquire *ua;
2204 	struct nlmsghdr *nlh;
2205 	__u32 seq = xfrm_get_acqseq();
2206 
2207 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2208 	if (nlh == NULL)
2209 		return -EMSGSIZE;
2210 
2211 	ua = nlmsg_data(nlh);
2212 	memcpy(&ua->id, &x->id, sizeof(ua->id));
2213 	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2214 	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2215 	copy_to_user_policy(xp, &ua->policy, dir);
2216 	ua->aalgos = xt->aalgos;
2217 	ua->ealgos = xt->ealgos;
2218 	ua->calgos = xt->calgos;
2219 	ua->seq = x->km.seq = seq;
2220 
2221 	if (copy_to_user_tmpl(xp, skb) < 0)
2222 		goto nlmsg_failure;
2223 	if (copy_to_user_state_sec_ctx(x, skb))
2224 		goto nlmsg_failure;
2225 	if (copy_to_user_policy_type(xp->type, skb) < 0)
2226 		goto nlmsg_failure;
2227 
2228 	return nlmsg_end(skb, nlh);
2229 
2230 nlmsg_failure:
2231 	nlmsg_cancel(skb, nlh);
2232 	return -EMSGSIZE;
2233 }
2234 
2235 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2236 			     struct xfrm_policy *xp, int dir)
2237 {
2238 	struct sk_buff *skb;
2239 
2240 	skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2241 	if (skb == NULL)
2242 		return -ENOMEM;
2243 
2244 	if (build_acquire(skb, x, xt, xp, dir) < 0)
2245 		BUG();
2246 
2247 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2248 }
2249 
2250 /* User gives us xfrm_user_policy_info followed by an array of 0
2251  * or more templates.
2252  */
2253 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2254 					       u8 *data, int len, int *dir)
2255 {
2256 	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2257 	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2258 	struct xfrm_policy *xp;
2259 	int nr;
2260 
2261 	switch (sk->sk_family) {
2262 	case AF_INET:
2263 		if (opt != IP_XFRM_POLICY) {
2264 			*dir = -EOPNOTSUPP;
2265 			return NULL;
2266 		}
2267 		break;
2268 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2269 	case AF_INET6:
2270 		if (opt != IPV6_XFRM_POLICY) {
2271 			*dir = -EOPNOTSUPP;
2272 			return NULL;
2273 		}
2274 		break;
2275 #endif
2276 	default:
2277 		*dir = -EINVAL;
2278 		return NULL;
2279 	}
2280 
2281 	*dir = -EINVAL;
2282 
2283 	if (len < sizeof(*p) ||
2284 	    verify_newpolicy_info(p))
2285 		return NULL;
2286 
2287 	nr = ((len - sizeof(*p)) / sizeof(*ut));
2288 	if (validate_tmpl(nr, ut, p->sel.family))
2289 		return NULL;
2290 
2291 	if (p->dir > XFRM_POLICY_OUT)
2292 		return NULL;
2293 
2294 	xp = xfrm_policy_alloc(GFP_KERNEL);
2295 	if (xp == NULL) {
2296 		*dir = -ENOBUFS;
2297 		return NULL;
2298 	}
2299 
2300 	copy_from_user_policy(xp, p);
2301 	xp->type = XFRM_POLICY_TYPE_MAIN;
2302 	copy_templates(xp, ut, nr);
2303 
2304 	*dir = p->dir;
2305 
2306 	return xp;
2307 }
2308 
2309 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2310 {
2311 	return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2312 	       + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2313 	       + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2314 	       + userpolicy_type_attrsize();
2315 }
2316 
2317 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2318 			   int dir, struct km_event *c)
2319 {
2320 	struct xfrm_user_polexpire *upe;
2321 	struct nlmsghdr *nlh;
2322 	int hard = c->data.hard;
2323 
2324 	nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2325 	if (nlh == NULL)
2326 		return -EMSGSIZE;
2327 
2328 	upe = nlmsg_data(nlh);
2329 	copy_to_user_policy(xp, &upe->pol, dir);
2330 	if (copy_to_user_tmpl(xp, skb) < 0)
2331 		goto nlmsg_failure;
2332 	if (copy_to_user_sec_ctx(xp, skb))
2333 		goto nlmsg_failure;
2334 	if (copy_to_user_policy_type(xp->type, skb) < 0)
2335 		goto nlmsg_failure;
2336 	upe->hard = !!hard;
2337 
2338 	return nlmsg_end(skb, nlh);
2339 
2340 nlmsg_failure:
2341 	nlmsg_cancel(skb, nlh);
2342 	return -EMSGSIZE;
2343 }
2344 
2345 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2346 {
2347 	struct sk_buff *skb;
2348 
2349 	skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2350 	if (skb == NULL)
2351 		return -ENOMEM;
2352 
2353 	if (build_polexpire(skb, xp, dir, c) < 0)
2354 		BUG();
2355 
2356 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2357 }
2358 
2359 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2360 {
2361 	struct xfrm_userpolicy_info *p;
2362 	struct xfrm_userpolicy_id *id;
2363 	struct nlmsghdr *nlh;
2364 	struct sk_buff *skb;
2365 	int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2366 	int headlen;
2367 
2368 	headlen = sizeof(*p);
2369 	if (c->event == XFRM_MSG_DELPOLICY) {
2370 		len += nla_total_size(headlen);
2371 		headlen = sizeof(*id);
2372 	}
2373 	len += userpolicy_type_attrsize();
2374 	len += NLMSG_ALIGN(headlen);
2375 
2376 	skb = nlmsg_new(len, GFP_ATOMIC);
2377 	if (skb == NULL)
2378 		return -ENOMEM;
2379 
2380 	nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2381 	if (nlh == NULL)
2382 		goto nlmsg_failure;
2383 
2384 	p = nlmsg_data(nlh);
2385 	if (c->event == XFRM_MSG_DELPOLICY) {
2386 		struct nlattr *attr;
2387 
2388 		id = nlmsg_data(nlh);
2389 		memset(id, 0, sizeof(*id));
2390 		id->dir = dir;
2391 		if (c->data.byid)
2392 			id->index = xp->index;
2393 		else
2394 			memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2395 
2396 		attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2397 		if (attr == NULL)
2398 			goto nlmsg_failure;
2399 
2400 		p = nla_data(attr);
2401 	}
2402 
2403 	copy_to_user_policy(xp, p, dir);
2404 	if (copy_to_user_tmpl(xp, skb) < 0)
2405 		goto nlmsg_failure;
2406 	if (copy_to_user_policy_type(xp->type, skb) < 0)
2407 		goto nlmsg_failure;
2408 
2409 	nlmsg_end(skb, nlh);
2410 
2411 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2412 
2413 nlmsg_failure:
2414 	kfree_skb(skb);
2415 	return -1;
2416 }
2417 
2418 static int xfrm_notify_policy_flush(struct km_event *c)
2419 {
2420 	struct nlmsghdr *nlh;
2421 	struct sk_buff *skb;
2422 
2423 	skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2424 	if (skb == NULL)
2425 		return -ENOMEM;
2426 
2427 	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2428 	if (nlh == NULL)
2429 		goto nlmsg_failure;
2430 	if (copy_to_user_policy_type(c->data.type, skb) < 0)
2431 		goto nlmsg_failure;
2432 
2433 	nlmsg_end(skb, nlh);
2434 
2435 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2436 
2437 nlmsg_failure:
2438 	kfree_skb(skb);
2439 	return -1;
2440 }
2441 
2442 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2443 {
2444 
2445 	switch (c->event) {
2446 	case XFRM_MSG_NEWPOLICY:
2447 	case XFRM_MSG_UPDPOLICY:
2448 	case XFRM_MSG_DELPOLICY:
2449 		return xfrm_notify_policy(xp, dir, c);
2450 	case XFRM_MSG_FLUSHPOLICY:
2451 		return xfrm_notify_policy_flush(c);
2452 	case XFRM_MSG_POLEXPIRE:
2453 		return xfrm_exp_policy_notify(xp, dir, c);
2454 	default:
2455 		printk("xfrm_user: Unknown Policy event %d\n", c->event);
2456 	}
2457 
2458 	return 0;
2459 
2460 }
2461 
2462 static inline size_t xfrm_report_msgsize(void)
2463 {
2464 	return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2465 }
2466 
2467 static int build_report(struct sk_buff *skb, u8 proto,
2468 			struct xfrm_selector *sel, xfrm_address_t *addr)
2469 {
2470 	struct xfrm_user_report *ur;
2471 	struct nlmsghdr *nlh;
2472 
2473 	nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2474 	if (nlh == NULL)
2475 		return -EMSGSIZE;
2476 
2477 	ur = nlmsg_data(nlh);
2478 	ur->proto = proto;
2479 	memcpy(&ur->sel, sel, sizeof(ur->sel));
2480 
2481 	if (addr)
2482 		NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2483 
2484 	return nlmsg_end(skb, nlh);
2485 
2486 nla_put_failure:
2487 	nlmsg_cancel(skb, nlh);
2488 	return -EMSGSIZE;
2489 }
2490 
2491 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2492 			    xfrm_address_t *addr)
2493 {
2494 	struct sk_buff *skb;
2495 
2496 	skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2497 	if (skb == NULL)
2498 		return -ENOMEM;
2499 
2500 	if (build_report(skb, proto, sel, addr) < 0)
2501 		BUG();
2502 
2503 	return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2504 }
2505 
2506 static struct xfrm_mgr netlink_mgr = {
2507 	.id		= "netlink",
2508 	.notify		= xfrm_send_state_notify,
2509 	.acquire	= xfrm_send_acquire,
2510 	.compile_policy	= xfrm_compile_policy,
2511 	.notify_policy	= xfrm_send_policy_notify,
2512 	.report		= xfrm_send_report,
2513 	.migrate	= xfrm_send_migrate,
2514 };
2515 
2516 static int __init xfrm_user_init(void)
2517 {
2518 	struct sock *nlsk;
2519 
2520 	printk(KERN_INFO "Initializing XFRM netlink socket\n");
2521 
2522 	nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2523 				     xfrm_netlink_rcv, NULL, THIS_MODULE);
2524 	if (nlsk == NULL)
2525 		return -ENOMEM;
2526 	rcu_assign_pointer(xfrm_nl, nlsk);
2527 
2528 	xfrm_register_km(&netlink_mgr);
2529 
2530 	return 0;
2531 }
2532 
2533 static void __exit xfrm_user_exit(void)
2534 {
2535 	struct sock *nlsk = xfrm_nl;
2536 
2537 	xfrm_unregister_km(&netlink_mgr);
2538 	rcu_assign_pointer(xfrm_nl, NULL);
2539 	synchronize_rcu();
2540 	netlink_kernel_release(nlsk);
2541 }
2542 
2543 module_init(xfrm_user_init);
2544 module_exit(xfrm_user_exit);
2545 MODULE_LICENSE("GPL");
2546 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2547 
2548