xref: /openbmc/linux/net/key/af_key.c (revision d2999e1b)
1 /*
2  * net/key/af_key.c	An implementation of PF_KEYv2 sockets.
3  *
4  *		This program is free software; you can redistribute it and/or
5  *		modify it under the terms of the GNU General Public License
6  *		as published by the Free Software Foundation; either version
7  *		2 of the License, or (at your option) any later version.
8  *
9  * Authors:	Maxim Giryaev	<gem@asplinux.ru>
10  *		David S. Miller	<davem@redhat.com>
11  *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12  *		Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13  *		Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14  *		Derek Atkins <derek@ihtfp.com>
15  */
16 
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33 
34 #include <net/sock.h>
35 
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38 
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 	/* List of all pfkey sockets. */
42 	struct hlist_head table;
43 	atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46 
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 	/* struct sock must be the first member of struct pfkey_sock */
51 	struct sock	sk;
52 	int		registered;
53 	int		promisc;
54 
55 	struct {
56 		uint8_t		msg_version;
57 		uint32_t	msg_portid;
58 		int		(*dump)(struct pfkey_sock *sk);
59 		void		(*done)(struct pfkey_sock *sk);
60 		union {
61 			struct xfrm_policy_walk	policy;
62 			struct xfrm_state_walk	state;
63 		} u;
64 		struct sk_buff	*skb;
65 	} dump;
66 };
67 
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 	return (struct pfkey_sock *)sk;
71 }
72 
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 	if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 		return 1;
77 	return 0;
78 }
79 
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 	if (pfk->dump.dump) {
83 		if (pfk->dump.skb) {
84 			kfree_skb(pfk->dump.skb);
85 			pfk->dump.skb = NULL;
86 		}
87 		pfk->dump.done(pfk);
88 		pfk->dump.dump = NULL;
89 		pfk->dump.done = NULL;
90 	}
91 }
92 
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 	struct net *net = sock_net(sk);
96 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97 
98 	pfkey_terminate_dump(pfkey_sk(sk));
99 	skb_queue_purge(&sk->sk_receive_queue);
100 
101 	if (!sock_flag(sk, SOCK_DEAD)) {
102 		pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 		return;
104 	}
105 
106 	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108 
109 	atomic_dec(&net_pfkey->socks_nr);
110 }
111 
112 static const struct proto_ops pfkey_ops;
113 
114 static void pfkey_insert(struct sock *sk)
115 {
116 	struct net *net = sock_net(sk);
117 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118 
119 	mutex_lock(&pfkey_mutex);
120 	sk_add_node_rcu(sk, &net_pfkey->table);
121 	mutex_unlock(&pfkey_mutex);
122 }
123 
124 static void pfkey_remove(struct sock *sk)
125 {
126 	mutex_lock(&pfkey_mutex);
127 	sk_del_node_init_rcu(sk);
128 	mutex_unlock(&pfkey_mutex);
129 }
130 
131 static struct proto key_proto = {
132 	.name	  = "KEY",
133 	.owner	  = THIS_MODULE,
134 	.obj_size = sizeof(struct pfkey_sock),
135 };
136 
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 			int kern)
139 {
140 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 	struct sock *sk;
142 	int err;
143 
144 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 		return -EPERM;
146 	if (sock->type != SOCK_RAW)
147 		return -ESOCKTNOSUPPORT;
148 	if (protocol != PF_KEY_V2)
149 		return -EPROTONOSUPPORT;
150 
151 	err = -ENOMEM;
152 	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 	if (sk == NULL)
154 		goto out;
155 
156 	sock->ops = &pfkey_ops;
157 	sock_init_data(sock, sk);
158 
159 	sk->sk_family = PF_KEY;
160 	sk->sk_destruct = pfkey_sock_destruct;
161 
162 	atomic_inc(&net_pfkey->socks_nr);
163 
164 	pfkey_insert(sk);
165 
166 	return 0;
167 out:
168 	return err;
169 }
170 
171 static int pfkey_release(struct socket *sock)
172 {
173 	struct sock *sk = sock->sk;
174 
175 	if (!sk)
176 		return 0;
177 
178 	pfkey_remove(sk);
179 
180 	sock_orphan(sk);
181 	sock->sk = NULL;
182 	skb_queue_purge(&sk->sk_write_queue);
183 
184 	synchronize_rcu();
185 	sock_put(sk);
186 
187 	return 0;
188 }
189 
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 			       gfp_t allocation, struct sock *sk)
192 {
193 	int err = -ENOBUFS;
194 
195 	sock_hold(sk);
196 	if (*skb2 == NULL) {
197 		if (atomic_read(&skb->users) != 1) {
198 			*skb2 = skb_clone(skb, allocation);
199 		} else {
200 			*skb2 = skb;
201 			atomic_inc(&skb->users);
202 		}
203 	}
204 	if (*skb2 != NULL) {
205 		if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 			skb_set_owner_r(*skb2, sk);
207 			skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 			sk->sk_data_ready(sk);
209 			*skb2 = NULL;
210 			err = 0;
211 		}
212 	}
213 	sock_put(sk);
214 	return err;
215 }
216 
217 /* Send SKB to all pfkey sockets matching selected criteria.  */
218 #define BROADCAST_ALL		0
219 #define BROADCAST_ONE		1
220 #define BROADCAST_REGISTERED	2
221 #define BROADCAST_PROMISC_ONLY	4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 			   int broadcast_flags, struct sock *one_sk,
224 			   struct net *net)
225 {
226 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 	struct sock *sk;
228 	struct sk_buff *skb2 = NULL;
229 	int err = -ESRCH;
230 
231 	/* XXX Do we need something like netlink_overrun?  I think
232 	 * XXX PF_KEY socket apps will not mind current behavior.
233 	 */
234 	if (!skb)
235 		return -ENOMEM;
236 
237 	rcu_read_lock();
238 	sk_for_each_rcu(sk, &net_pfkey->table) {
239 		struct pfkey_sock *pfk = pfkey_sk(sk);
240 		int err2;
241 
242 		/* Yes, it means that if you are meant to receive this
243 		 * pfkey message you receive it twice as promiscuous
244 		 * socket.
245 		 */
246 		if (pfk->promisc)
247 			pfkey_broadcast_one(skb, &skb2, allocation, sk);
248 
249 		/* the exact target will be processed later */
250 		if (sk == one_sk)
251 			continue;
252 		if (broadcast_flags != BROADCAST_ALL) {
253 			if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 				continue;
255 			if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 			    !pfk->registered)
257 				continue;
258 			if (broadcast_flags & BROADCAST_ONE)
259 				continue;
260 		}
261 
262 		err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263 
264 		/* Error is cleare after succecful sending to at least one
265 		 * registered KM */
266 		if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 			err = err2;
268 	}
269 	rcu_read_unlock();
270 
271 	if (one_sk != NULL)
272 		err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273 
274 	kfree_skb(skb2);
275 	kfree_skb(skb);
276 	return err;
277 }
278 
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281 	struct sadb_msg *hdr;
282 	int rc;
283 
284 	rc = pfk->dump.dump(pfk);
285 	if (rc == -ENOBUFS)
286 		return 0;
287 
288 	if (pfk->dump.skb) {
289 		if (!pfkey_can_dump(&pfk->sk))
290 			return 0;
291 
292 		hdr = (struct sadb_msg *) pfk->dump.skb->data;
293 		hdr->sadb_msg_seq = 0;
294 		hdr->sadb_msg_errno = rc;
295 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296 				&pfk->sk, sock_net(&pfk->sk));
297 		pfk->dump.skb = NULL;
298 	}
299 
300 	pfkey_terminate_dump(pfk);
301 	return rc;
302 }
303 
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305 				 const struct sadb_msg *orig)
306 {
307 	*new = *orig;
308 }
309 
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312 	struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313 	struct sadb_msg *hdr;
314 
315 	if (!skb)
316 		return -ENOBUFS;
317 
318 	/* Woe be to the platform trying to support PFKEY yet
319 	 * having normal errnos outside the 1-255 range, inclusive.
320 	 */
321 	err = -err;
322 	if (err == ERESTARTSYS ||
323 	    err == ERESTARTNOHAND ||
324 	    err == ERESTARTNOINTR)
325 		err = EINTR;
326 	if (err >= 512)
327 		err = EINVAL;
328 	BUG_ON(err <= 0 || err >= 256);
329 
330 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331 	pfkey_hdr_dup(hdr, orig);
332 	hdr->sadb_msg_errno = (uint8_t) err;
333 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334 			     sizeof(uint64_t));
335 
336 	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337 
338 	return 0;
339 }
340 
341 static const u8 sadb_ext_min_len[] = {
342 	[SADB_EXT_RESERVED]		= (u8) 0,
343 	[SADB_EXT_SA]			= (u8) sizeof(struct sadb_sa),
344 	[SADB_EXT_LIFETIME_CURRENT]	= (u8) sizeof(struct sadb_lifetime),
345 	[SADB_EXT_LIFETIME_HARD]	= (u8) sizeof(struct sadb_lifetime),
346 	[SADB_EXT_LIFETIME_SOFT]	= (u8) sizeof(struct sadb_lifetime),
347 	[SADB_EXT_ADDRESS_SRC]		= (u8) sizeof(struct sadb_address),
348 	[SADB_EXT_ADDRESS_DST]		= (u8) sizeof(struct sadb_address),
349 	[SADB_EXT_ADDRESS_PROXY]	= (u8) sizeof(struct sadb_address),
350 	[SADB_EXT_KEY_AUTH]		= (u8) sizeof(struct sadb_key),
351 	[SADB_EXT_KEY_ENCRYPT]		= (u8) sizeof(struct sadb_key),
352 	[SADB_EXT_IDENTITY_SRC]		= (u8) sizeof(struct sadb_ident),
353 	[SADB_EXT_IDENTITY_DST]		= (u8) sizeof(struct sadb_ident),
354 	[SADB_EXT_SENSITIVITY]		= (u8) sizeof(struct sadb_sens),
355 	[SADB_EXT_PROPOSAL]		= (u8) sizeof(struct sadb_prop),
356 	[SADB_EXT_SUPPORTED_AUTH]	= (u8) sizeof(struct sadb_supported),
357 	[SADB_EXT_SUPPORTED_ENCRYPT]	= (u8) sizeof(struct sadb_supported),
358 	[SADB_EXT_SPIRANGE]		= (u8) sizeof(struct sadb_spirange),
359 	[SADB_X_EXT_KMPRIVATE]		= (u8) sizeof(struct sadb_x_kmprivate),
360 	[SADB_X_EXT_POLICY]		= (u8) sizeof(struct sadb_x_policy),
361 	[SADB_X_EXT_SA2]		= (u8) sizeof(struct sadb_x_sa2),
362 	[SADB_X_EXT_NAT_T_TYPE]		= (u8) sizeof(struct sadb_x_nat_t_type),
363 	[SADB_X_EXT_NAT_T_SPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
364 	[SADB_X_EXT_NAT_T_DPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
365 	[SADB_X_EXT_NAT_T_OA]		= (u8) sizeof(struct sadb_address),
366 	[SADB_X_EXT_SEC_CTX]		= (u8) sizeof(struct sadb_x_sec_ctx),
367 	[SADB_X_EXT_KMADDRESS]		= (u8) sizeof(struct sadb_x_kmaddress),
368 	[SADB_X_EXT_FILTER]		= (u8) sizeof(struct sadb_x_filter),
369 };
370 
371 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
372 static int verify_address_len(const void *p)
373 {
374 	const struct sadb_address *sp = p;
375 	const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
376 	const struct sockaddr_in *sin;
377 #if IS_ENABLED(CONFIG_IPV6)
378 	const struct sockaddr_in6 *sin6;
379 #endif
380 	int len;
381 
382 	switch (addr->sa_family) {
383 	case AF_INET:
384 		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
385 		if (sp->sadb_address_len != len ||
386 		    sp->sadb_address_prefixlen > 32)
387 			return -EINVAL;
388 		break;
389 #if IS_ENABLED(CONFIG_IPV6)
390 	case AF_INET6:
391 		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
392 		if (sp->sadb_address_len != len ||
393 		    sp->sadb_address_prefixlen > 128)
394 			return -EINVAL;
395 		break;
396 #endif
397 	default:
398 		/* It is user using kernel to keep track of security
399 		 * associations for another protocol, such as
400 		 * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
401 		 * lengths.
402 		 *
403 		 * XXX Actually, association/policy database is not yet
404 		 * XXX able to cope with arbitrary sockaddr families.
405 		 * XXX When it can, remove this -EINVAL.  -DaveM
406 		 */
407 		return -EINVAL;
408 		break;
409 	}
410 
411 	return 0;
412 }
413 
414 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
415 {
416 	return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
417 			    sec_ctx->sadb_x_ctx_len,
418 			    sizeof(uint64_t));
419 }
420 
421 static inline int verify_sec_ctx_len(const void *p)
422 {
423 	const struct sadb_x_sec_ctx *sec_ctx = p;
424 	int len = sec_ctx->sadb_x_ctx_len;
425 
426 	if (len > PAGE_SIZE)
427 		return -EINVAL;
428 
429 	len = pfkey_sec_ctx_len(sec_ctx);
430 
431 	if (sec_ctx->sadb_x_sec_len != len)
432 		return -EINVAL;
433 
434 	return 0;
435 }
436 
437 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
438 								     gfp_t gfp)
439 {
440 	struct xfrm_user_sec_ctx *uctx = NULL;
441 	int ctx_size = sec_ctx->sadb_x_ctx_len;
442 
443 	uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
444 
445 	if (!uctx)
446 		return NULL;
447 
448 	uctx->len = pfkey_sec_ctx_len(sec_ctx);
449 	uctx->exttype = sec_ctx->sadb_x_sec_exttype;
450 	uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
451 	uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
452 	uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
453 	memcpy(uctx + 1, sec_ctx + 1,
454 	       uctx->ctx_len);
455 
456 	return uctx;
457 }
458 
459 static int present_and_same_family(const struct sadb_address *src,
460 				   const struct sadb_address *dst)
461 {
462 	const struct sockaddr *s_addr, *d_addr;
463 
464 	if (!src || !dst)
465 		return 0;
466 
467 	s_addr = (const struct sockaddr *)(src + 1);
468 	d_addr = (const struct sockaddr *)(dst + 1);
469 	if (s_addr->sa_family != d_addr->sa_family)
470 		return 0;
471 	if (s_addr->sa_family != AF_INET
472 #if IS_ENABLED(CONFIG_IPV6)
473 	    && s_addr->sa_family != AF_INET6
474 #endif
475 		)
476 		return 0;
477 
478 	return 1;
479 }
480 
481 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
482 {
483 	const char *p = (char *) hdr;
484 	int len = skb->len;
485 
486 	len -= sizeof(*hdr);
487 	p += sizeof(*hdr);
488 	while (len > 0) {
489 		const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
490 		uint16_t ext_type;
491 		int ext_len;
492 
493 		ext_len  = ehdr->sadb_ext_len;
494 		ext_len *= sizeof(uint64_t);
495 		ext_type = ehdr->sadb_ext_type;
496 		if (ext_len < sizeof(uint64_t) ||
497 		    ext_len > len ||
498 		    ext_type == SADB_EXT_RESERVED)
499 			return -EINVAL;
500 
501 		if (ext_type <= SADB_EXT_MAX) {
502 			int min = (int) sadb_ext_min_len[ext_type];
503 			if (ext_len < min)
504 				return -EINVAL;
505 			if (ext_hdrs[ext_type-1] != NULL)
506 				return -EINVAL;
507 			if (ext_type == SADB_EXT_ADDRESS_SRC ||
508 			    ext_type == SADB_EXT_ADDRESS_DST ||
509 			    ext_type == SADB_EXT_ADDRESS_PROXY ||
510 			    ext_type == SADB_X_EXT_NAT_T_OA) {
511 				if (verify_address_len(p))
512 					return -EINVAL;
513 			}
514 			if (ext_type == SADB_X_EXT_SEC_CTX) {
515 				if (verify_sec_ctx_len(p))
516 					return -EINVAL;
517 			}
518 			ext_hdrs[ext_type-1] = (void *) p;
519 		}
520 		p   += ext_len;
521 		len -= ext_len;
522 	}
523 
524 	return 0;
525 }
526 
527 static uint16_t
528 pfkey_satype2proto(uint8_t satype)
529 {
530 	switch (satype) {
531 	case SADB_SATYPE_UNSPEC:
532 		return IPSEC_PROTO_ANY;
533 	case SADB_SATYPE_AH:
534 		return IPPROTO_AH;
535 	case SADB_SATYPE_ESP:
536 		return IPPROTO_ESP;
537 	case SADB_X_SATYPE_IPCOMP:
538 		return IPPROTO_COMP;
539 		break;
540 	default:
541 		return 0;
542 	}
543 	/* NOTREACHED */
544 }
545 
546 static uint8_t
547 pfkey_proto2satype(uint16_t proto)
548 {
549 	switch (proto) {
550 	case IPPROTO_AH:
551 		return SADB_SATYPE_AH;
552 	case IPPROTO_ESP:
553 		return SADB_SATYPE_ESP;
554 	case IPPROTO_COMP:
555 		return SADB_X_SATYPE_IPCOMP;
556 		break;
557 	default:
558 		return 0;
559 	}
560 	/* NOTREACHED */
561 }
562 
563 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
564  * say specifically 'just raw sockets' as we encode them as 255.
565  */
566 
567 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
568 {
569 	return proto == IPSEC_PROTO_ANY ? 0 : proto;
570 }
571 
572 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
573 {
574 	return proto ? proto : IPSEC_PROTO_ANY;
575 }
576 
577 static inline int pfkey_sockaddr_len(sa_family_t family)
578 {
579 	switch (family) {
580 	case AF_INET:
581 		return sizeof(struct sockaddr_in);
582 #if IS_ENABLED(CONFIG_IPV6)
583 	case AF_INET6:
584 		return sizeof(struct sockaddr_in6);
585 #endif
586 	}
587 	return 0;
588 }
589 
590 static
591 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
592 {
593 	switch (sa->sa_family) {
594 	case AF_INET:
595 		xaddr->a4 =
596 			((struct sockaddr_in *)sa)->sin_addr.s_addr;
597 		return AF_INET;
598 #if IS_ENABLED(CONFIG_IPV6)
599 	case AF_INET6:
600 		memcpy(xaddr->a6,
601 		       &((struct sockaddr_in6 *)sa)->sin6_addr,
602 		       sizeof(struct in6_addr));
603 		return AF_INET6;
604 #endif
605 	}
606 	return 0;
607 }
608 
609 static
610 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
611 {
612 	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
613 				      xaddr);
614 }
615 
616 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
617 {
618 	const struct sadb_sa *sa;
619 	const struct sadb_address *addr;
620 	uint16_t proto;
621 	unsigned short family;
622 	xfrm_address_t *xaddr;
623 
624 	sa = ext_hdrs[SADB_EXT_SA - 1];
625 	if (sa == NULL)
626 		return NULL;
627 
628 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
629 	if (proto == 0)
630 		return NULL;
631 
632 	/* sadb_address_len should be checked by caller */
633 	addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
634 	if (addr == NULL)
635 		return NULL;
636 
637 	family = ((const struct sockaddr *)(addr + 1))->sa_family;
638 	switch (family) {
639 	case AF_INET:
640 		xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
641 		break;
642 #if IS_ENABLED(CONFIG_IPV6)
643 	case AF_INET6:
644 		xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
645 		break;
646 #endif
647 	default:
648 		xaddr = NULL;
649 	}
650 
651 	if (!xaddr)
652 		return NULL;
653 
654 	return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
655 }
656 
657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
658 
659 static int
660 pfkey_sockaddr_size(sa_family_t family)
661 {
662 	return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
663 }
664 
665 static inline int pfkey_mode_from_xfrm(int mode)
666 {
667 	switch(mode) {
668 	case XFRM_MODE_TRANSPORT:
669 		return IPSEC_MODE_TRANSPORT;
670 	case XFRM_MODE_TUNNEL:
671 		return IPSEC_MODE_TUNNEL;
672 	case XFRM_MODE_BEET:
673 		return IPSEC_MODE_BEET;
674 	default:
675 		return -1;
676 	}
677 }
678 
679 static inline int pfkey_mode_to_xfrm(int mode)
680 {
681 	switch(mode) {
682 	case IPSEC_MODE_ANY:	/*XXX*/
683 	case IPSEC_MODE_TRANSPORT:
684 		return XFRM_MODE_TRANSPORT;
685 	case IPSEC_MODE_TUNNEL:
686 		return XFRM_MODE_TUNNEL;
687 	case IPSEC_MODE_BEET:
688 		return XFRM_MODE_BEET;
689 	default:
690 		return -1;
691 	}
692 }
693 
694 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
695 					struct sockaddr *sa,
696 					unsigned short family)
697 {
698 	switch (family) {
699 	case AF_INET:
700 	    {
701 		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
702 		sin->sin_family = AF_INET;
703 		sin->sin_port = port;
704 		sin->sin_addr.s_addr = xaddr->a4;
705 		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
706 		return 32;
707 	    }
708 #if IS_ENABLED(CONFIG_IPV6)
709 	case AF_INET6:
710 	    {
711 		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
712 		sin6->sin6_family = AF_INET6;
713 		sin6->sin6_port = port;
714 		sin6->sin6_flowinfo = 0;
715 		sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
716 		sin6->sin6_scope_id = 0;
717 		return 128;
718 	    }
719 #endif
720 	}
721 	return 0;
722 }
723 
724 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
725 					      int add_keys, int hsc)
726 {
727 	struct sk_buff *skb;
728 	struct sadb_msg *hdr;
729 	struct sadb_sa *sa;
730 	struct sadb_lifetime *lifetime;
731 	struct sadb_address *addr;
732 	struct sadb_key *key;
733 	struct sadb_x_sa2 *sa2;
734 	struct sadb_x_sec_ctx *sec_ctx;
735 	struct xfrm_sec_ctx *xfrm_ctx;
736 	int ctx_size = 0;
737 	int size;
738 	int auth_key_size = 0;
739 	int encrypt_key_size = 0;
740 	int sockaddr_size;
741 	struct xfrm_encap_tmpl *natt = NULL;
742 	int mode;
743 
744 	/* address family check */
745 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
746 	if (!sockaddr_size)
747 		return ERR_PTR(-EINVAL);
748 
749 	/* base, SA, (lifetime (HSC),) address(SD), (address(P),)
750 	   key(AE), (identity(SD),) (sensitivity)> */
751 	size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
752 		sizeof(struct sadb_lifetime) +
753 		((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
754 		((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
755 			sizeof(struct sadb_address)*2 +
756 				sockaddr_size*2 +
757 					sizeof(struct sadb_x_sa2);
758 
759 	if ((xfrm_ctx = x->security)) {
760 		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
761 		size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
762 	}
763 
764 	/* identity & sensitivity */
765 	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
766 		size += sizeof(struct sadb_address) + sockaddr_size;
767 
768 	if (add_keys) {
769 		if (x->aalg && x->aalg->alg_key_len) {
770 			auth_key_size =
771 				PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
772 			size += sizeof(struct sadb_key) + auth_key_size;
773 		}
774 		if (x->ealg && x->ealg->alg_key_len) {
775 			encrypt_key_size =
776 				PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
777 			size += sizeof(struct sadb_key) + encrypt_key_size;
778 		}
779 	}
780 	if (x->encap)
781 		natt = x->encap;
782 
783 	if (natt && natt->encap_type) {
784 		size += sizeof(struct sadb_x_nat_t_type);
785 		size += sizeof(struct sadb_x_nat_t_port);
786 		size += sizeof(struct sadb_x_nat_t_port);
787 	}
788 
789 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
790 	if (skb == NULL)
791 		return ERR_PTR(-ENOBUFS);
792 
793 	/* call should fill header later */
794 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
795 	memset(hdr, 0, size);	/* XXX do we need this ? */
796 	hdr->sadb_msg_len = size / sizeof(uint64_t);
797 
798 	/* sa */
799 	sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
800 	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
801 	sa->sadb_sa_exttype = SADB_EXT_SA;
802 	sa->sadb_sa_spi = x->id.spi;
803 	sa->sadb_sa_replay = x->props.replay_window;
804 	switch (x->km.state) {
805 	case XFRM_STATE_VALID:
806 		sa->sadb_sa_state = x->km.dying ?
807 			SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
808 		break;
809 	case XFRM_STATE_ACQ:
810 		sa->sadb_sa_state = SADB_SASTATE_LARVAL;
811 		break;
812 	default:
813 		sa->sadb_sa_state = SADB_SASTATE_DEAD;
814 		break;
815 	}
816 	sa->sadb_sa_auth = 0;
817 	if (x->aalg) {
818 		struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
819 		sa->sadb_sa_auth = (a && a->pfkey_supported) ?
820 					a->desc.sadb_alg_id : 0;
821 	}
822 	sa->sadb_sa_encrypt = 0;
823 	BUG_ON(x->ealg && x->calg);
824 	if (x->ealg) {
825 		struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
826 		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
827 					a->desc.sadb_alg_id : 0;
828 	}
829 	/* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
830 	if (x->calg) {
831 		struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
832 		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
833 					a->desc.sadb_alg_id : 0;
834 	}
835 
836 	sa->sadb_sa_flags = 0;
837 	if (x->props.flags & XFRM_STATE_NOECN)
838 		sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
839 	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
840 		sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
841 	if (x->props.flags & XFRM_STATE_NOPMTUDISC)
842 		sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
843 
844 	/* hard time */
845 	if (hsc & 2) {
846 		lifetime = (struct sadb_lifetime *)  skb_put(skb,
847 							     sizeof(struct sadb_lifetime));
848 		lifetime->sadb_lifetime_len =
849 			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
850 		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
851 		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
852 		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
853 		lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
854 		lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
855 	}
856 	/* soft time */
857 	if (hsc & 1) {
858 		lifetime = (struct sadb_lifetime *)  skb_put(skb,
859 							     sizeof(struct sadb_lifetime));
860 		lifetime->sadb_lifetime_len =
861 			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
862 		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
863 		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
864 		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
865 		lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
866 		lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
867 	}
868 	/* current time */
869 	lifetime = (struct sadb_lifetime *)  skb_put(skb,
870 						     sizeof(struct sadb_lifetime));
871 	lifetime->sadb_lifetime_len =
872 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
873 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
874 	lifetime->sadb_lifetime_allocations = x->curlft.packets;
875 	lifetime->sadb_lifetime_bytes = x->curlft.bytes;
876 	lifetime->sadb_lifetime_addtime = x->curlft.add_time;
877 	lifetime->sadb_lifetime_usetime = x->curlft.use_time;
878 	/* src address */
879 	addr = (struct sadb_address*) skb_put(skb,
880 					      sizeof(struct sadb_address)+sockaddr_size);
881 	addr->sadb_address_len =
882 		(sizeof(struct sadb_address)+sockaddr_size)/
883 			sizeof(uint64_t);
884 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
885 	/* "if the ports are non-zero, then the sadb_address_proto field,
886 	   normally zero, MUST be filled in with the transport
887 	   protocol's number." - RFC2367 */
888 	addr->sadb_address_proto = 0;
889 	addr->sadb_address_reserved = 0;
890 
891 	addr->sadb_address_prefixlen =
892 		pfkey_sockaddr_fill(&x->props.saddr, 0,
893 				    (struct sockaddr *) (addr + 1),
894 				    x->props.family);
895 	if (!addr->sadb_address_prefixlen)
896 		BUG();
897 
898 	/* dst address */
899 	addr = (struct sadb_address*) skb_put(skb,
900 					      sizeof(struct sadb_address)+sockaddr_size);
901 	addr->sadb_address_len =
902 		(sizeof(struct sadb_address)+sockaddr_size)/
903 			sizeof(uint64_t);
904 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
905 	addr->sadb_address_proto = 0;
906 	addr->sadb_address_reserved = 0;
907 
908 	addr->sadb_address_prefixlen =
909 		pfkey_sockaddr_fill(&x->id.daddr, 0,
910 				    (struct sockaddr *) (addr + 1),
911 				    x->props.family);
912 	if (!addr->sadb_address_prefixlen)
913 		BUG();
914 
915 	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
916 			     x->props.family)) {
917 		addr = (struct sadb_address*) skb_put(skb,
918 			sizeof(struct sadb_address)+sockaddr_size);
919 		addr->sadb_address_len =
920 			(sizeof(struct sadb_address)+sockaddr_size)/
921 			sizeof(uint64_t);
922 		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
923 		addr->sadb_address_proto =
924 			pfkey_proto_from_xfrm(x->sel.proto);
925 		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
926 		addr->sadb_address_reserved = 0;
927 
928 		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
929 				    (struct sockaddr *) (addr + 1),
930 				    x->props.family);
931 	}
932 
933 	/* auth key */
934 	if (add_keys && auth_key_size) {
935 		key = (struct sadb_key *) skb_put(skb,
936 						  sizeof(struct sadb_key)+auth_key_size);
937 		key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
938 			sizeof(uint64_t);
939 		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
940 		key->sadb_key_bits = x->aalg->alg_key_len;
941 		key->sadb_key_reserved = 0;
942 		memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
943 	}
944 	/* encrypt key */
945 	if (add_keys && encrypt_key_size) {
946 		key = (struct sadb_key *) skb_put(skb,
947 						  sizeof(struct sadb_key)+encrypt_key_size);
948 		key->sadb_key_len = (sizeof(struct sadb_key) +
949 				     encrypt_key_size) / sizeof(uint64_t);
950 		key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
951 		key->sadb_key_bits = x->ealg->alg_key_len;
952 		key->sadb_key_reserved = 0;
953 		memcpy(key + 1, x->ealg->alg_key,
954 		       (x->ealg->alg_key_len+7)/8);
955 	}
956 
957 	/* sa */
958 	sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
959 	sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
960 	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
961 	if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
962 		kfree_skb(skb);
963 		return ERR_PTR(-EINVAL);
964 	}
965 	sa2->sadb_x_sa2_mode = mode;
966 	sa2->sadb_x_sa2_reserved1 = 0;
967 	sa2->sadb_x_sa2_reserved2 = 0;
968 	sa2->sadb_x_sa2_sequence = 0;
969 	sa2->sadb_x_sa2_reqid = x->props.reqid;
970 
971 	if (natt && natt->encap_type) {
972 		struct sadb_x_nat_t_type *n_type;
973 		struct sadb_x_nat_t_port *n_port;
974 
975 		/* type */
976 		n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
977 		n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
978 		n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
979 		n_type->sadb_x_nat_t_type_type = natt->encap_type;
980 		n_type->sadb_x_nat_t_type_reserved[0] = 0;
981 		n_type->sadb_x_nat_t_type_reserved[1] = 0;
982 		n_type->sadb_x_nat_t_type_reserved[2] = 0;
983 
984 		/* source port */
985 		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
986 		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
987 		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
988 		n_port->sadb_x_nat_t_port_port = natt->encap_sport;
989 		n_port->sadb_x_nat_t_port_reserved = 0;
990 
991 		/* dest port */
992 		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
993 		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
994 		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
995 		n_port->sadb_x_nat_t_port_port = natt->encap_dport;
996 		n_port->sadb_x_nat_t_port_reserved = 0;
997 	}
998 
999 	/* security context */
1000 	if (xfrm_ctx) {
1001 		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1002 				sizeof(struct sadb_x_sec_ctx) + ctx_size);
1003 		sec_ctx->sadb_x_sec_len =
1004 		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1005 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1006 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1007 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1008 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1009 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1010 		       xfrm_ctx->ctx_len);
1011 	}
1012 
1013 	return skb;
1014 }
1015 
1016 
1017 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1018 {
1019 	struct sk_buff *skb;
1020 
1021 	skb = __pfkey_xfrm_state2msg(x, 1, 3);
1022 
1023 	return skb;
1024 }
1025 
1026 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1027 							  int hsc)
1028 {
1029 	return __pfkey_xfrm_state2msg(x, 0, hsc);
1030 }
1031 
1032 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1033 						const struct sadb_msg *hdr,
1034 						void * const *ext_hdrs)
1035 {
1036 	struct xfrm_state *x;
1037 	const struct sadb_lifetime *lifetime;
1038 	const struct sadb_sa *sa;
1039 	const struct sadb_key *key;
1040 	const struct sadb_x_sec_ctx *sec_ctx;
1041 	uint16_t proto;
1042 	int err;
1043 
1044 
1045 	sa = ext_hdrs[SADB_EXT_SA - 1];
1046 	if (!sa ||
1047 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1048 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1049 		return ERR_PTR(-EINVAL);
1050 	if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1051 	    !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1052 		return ERR_PTR(-EINVAL);
1053 	if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1054 	    !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1055 		return ERR_PTR(-EINVAL);
1056 	if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1057 	    !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1058 		return ERR_PTR(-EINVAL);
1059 
1060 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1061 	if (proto == 0)
1062 		return ERR_PTR(-EINVAL);
1063 
1064 	/* default error is no buffer space */
1065 	err = -ENOBUFS;
1066 
1067 	/* RFC2367:
1068 
1069    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1070    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1071    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1072    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1073    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1074    not true.
1075 
1076 	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
1077 	   Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1078 	 */
1079 	if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1080 	    (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1081 	     sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1082 	    sa->sadb_sa_encrypt > SADB_EALG_MAX)
1083 		return ERR_PTR(-EINVAL);
1084 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1085 	if (key != NULL &&
1086 	    sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1087 	    ((key->sadb_key_bits+7) / 8 == 0 ||
1088 	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1089 		return ERR_PTR(-EINVAL);
1090 	key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1091 	if (key != NULL &&
1092 	    sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1093 	    ((key->sadb_key_bits+7) / 8 == 0 ||
1094 	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1095 		return ERR_PTR(-EINVAL);
1096 
1097 	x = xfrm_state_alloc(net);
1098 	if (x == NULL)
1099 		return ERR_PTR(-ENOBUFS);
1100 
1101 	x->id.proto = proto;
1102 	x->id.spi = sa->sadb_sa_spi;
1103 	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1104 					(sizeof(x->replay.bitmap) * 8));
1105 	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1106 		x->props.flags |= XFRM_STATE_NOECN;
1107 	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1108 		x->props.flags |= XFRM_STATE_DECAP_DSCP;
1109 	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1110 		x->props.flags |= XFRM_STATE_NOPMTUDISC;
1111 
1112 	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1113 	if (lifetime != NULL) {
1114 		x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1115 		x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1116 		x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1117 		x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1118 	}
1119 	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1120 	if (lifetime != NULL) {
1121 		x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1122 		x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1123 		x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1124 		x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1125 	}
1126 
1127 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1128 	if (sec_ctx != NULL) {
1129 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1130 
1131 		if (!uctx)
1132 			goto out;
1133 
1134 		err = security_xfrm_state_alloc(x, uctx);
1135 		kfree(uctx);
1136 
1137 		if (err)
1138 			goto out;
1139 	}
1140 
1141 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1142 	if (sa->sadb_sa_auth) {
1143 		int keysize = 0;
1144 		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1145 		if (!a || !a->pfkey_supported) {
1146 			err = -ENOSYS;
1147 			goto out;
1148 		}
1149 		if (key)
1150 			keysize = (key->sadb_key_bits + 7) / 8;
1151 		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1152 		if (!x->aalg)
1153 			goto out;
1154 		strcpy(x->aalg->alg_name, a->name);
1155 		x->aalg->alg_key_len = 0;
1156 		if (key) {
1157 			x->aalg->alg_key_len = key->sadb_key_bits;
1158 			memcpy(x->aalg->alg_key, key+1, keysize);
1159 		}
1160 		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1161 		x->props.aalgo = sa->sadb_sa_auth;
1162 		/* x->algo.flags = sa->sadb_sa_flags; */
1163 	}
1164 	if (sa->sadb_sa_encrypt) {
1165 		if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1166 			struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1167 			if (!a || !a->pfkey_supported) {
1168 				err = -ENOSYS;
1169 				goto out;
1170 			}
1171 			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1172 			if (!x->calg)
1173 				goto out;
1174 			strcpy(x->calg->alg_name, a->name);
1175 			x->props.calgo = sa->sadb_sa_encrypt;
1176 		} else {
1177 			int keysize = 0;
1178 			struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1179 			if (!a || !a->pfkey_supported) {
1180 				err = -ENOSYS;
1181 				goto out;
1182 			}
1183 			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1184 			if (key)
1185 				keysize = (key->sadb_key_bits + 7) / 8;
1186 			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1187 			if (!x->ealg)
1188 				goto out;
1189 			strcpy(x->ealg->alg_name, a->name);
1190 			x->ealg->alg_key_len = 0;
1191 			if (key) {
1192 				x->ealg->alg_key_len = key->sadb_key_bits;
1193 				memcpy(x->ealg->alg_key, key+1, keysize);
1194 			}
1195 			x->props.ealgo = sa->sadb_sa_encrypt;
1196 		}
1197 	}
1198 	/* x->algo.flags = sa->sadb_sa_flags; */
1199 
1200 	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1201 						    &x->props.saddr);
1202 	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203 				  &x->id.daddr);
1204 
1205 	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206 		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207 		int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208 		if (mode < 0) {
1209 			err = -EINVAL;
1210 			goto out;
1211 		}
1212 		x->props.mode = mode;
1213 		x->props.reqid = sa2->sadb_x_sa2_reqid;
1214 	}
1215 
1216 	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217 		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218 
1219 		/* Nobody uses this, but we try. */
1220 		x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221 		x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222 	}
1223 
1224 	if (!x->sel.family)
1225 		x->sel.family = x->props.family;
1226 
1227 	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228 		const struct sadb_x_nat_t_type* n_type;
1229 		struct xfrm_encap_tmpl *natt;
1230 
1231 		x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232 		if (!x->encap)
1233 			goto out;
1234 
1235 		natt = x->encap;
1236 		n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237 		natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238 
1239 		if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240 			const struct sadb_x_nat_t_port *n_port =
1241 				ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242 			natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243 		}
1244 		if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245 			const struct sadb_x_nat_t_port *n_port =
1246 				ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247 			natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248 		}
1249 		memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250 	}
1251 
1252 	err = xfrm_init_state(x);
1253 	if (err)
1254 		goto out;
1255 
1256 	x->km.seq = hdr->sadb_msg_seq;
1257 	return x;
1258 
1259 out:
1260 	x->km.state = XFRM_STATE_DEAD;
1261 	xfrm_state_put(x);
1262 	return ERR_PTR(err);
1263 }
1264 
1265 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266 {
1267 	return -EOPNOTSUPP;
1268 }
1269 
1270 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271 {
1272 	struct net *net = sock_net(sk);
1273 	struct sk_buff *resp_skb;
1274 	struct sadb_x_sa2 *sa2;
1275 	struct sadb_address *saddr, *daddr;
1276 	struct sadb_msg *out_hdr;
1277 	struct sadb_spirange *range;
1278 	struct xfrm_state *x = NULL;
1279 	int mode;
1280 	int err;
1281 	u32 min_spi, max_spi;
1282 	u32 reqid;
1283 	u8 proto;
1284 	unsigned short family;
1285 	xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286 
1287 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289 		return -EINVAL;
1290 
1291 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292 	if (proto == 0)
1293 		return -EINVAL;
1294 
1295 	if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296 		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297 		if (mode < 0)
1298 			return -EINVAL;
1299 		reqid = sa2->sadb_x_sa2_reqid;
1300 	} else {
1301 		mode = 0;
1302 		reqid = 0;
1303 	}
1304 
1305 	saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306 	daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307 
1308 	family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309 	switch (family) {
1310 	case AF_INET:
1311 		xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312 		xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313 		break;
1314 #if IS_ENABLED(CONFIG_IPV6)
1315 	case AF_INET6:
1316 		xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317 		xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318 		break;
1319 #endif
1320 	}
1321 
1322 	if (hdr->sadb_msg_seq) {
1323 		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324 		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1325 			xfrm_state_put(x);
1326 			x = NULL;
1327 		}
1328 	}
1329 
1330 	if (!x)
1331 		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332 
1333 	if (x == NULL)
1334 		return -ENOENT;
1335 
1336 	min_spi = 0x100;
1337 	max_spi = 0x0fffffff;
1338 
1339 	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340 	if (range) {
1341 		min_spi = range->sadb_spirange_min;
1342 		max_spi = range->sadb_spirange_max;
1343 	}
1344 
1345 	err = verify_spi_info(x->id.proto, min_spi, max_spi);
1346 	if (err) {
1347 		xfrm_state_put(x);
1348 		return err;
1349 	}
1350 
1351 	err = xfrm_alloc_spi(x, min_spi, max_spi);
1352 	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1353 
1354 	if (IS_ERR(resp_skb)) {
1355 		xfrm_state_put(x);
1356 		return  PTR_ERR(resp_skb);
1357 	}
1358 
1359 	out_hdr = (struct sadb_msg *) resp_skb->data;
1360 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1361 	out_hdr->sadb_msg_type = SADB_GETSPI;
1362 	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1363 	out_hdr->sadb_msg_errno = 0;
1364 	out_hdr->sadb_msg_reserved = 0;
1365 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1366 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1367 
1368 	xfrm_state_put(x);
1369 
1370 	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1371 
1372 	return 0;
1373 }
1374 
1375 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1376 {
1377 	struct net *net = sock_net(sk);
1378 	struct xfrm_state *x;
1379 
1380 	if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1381 		return -EOPNOTSUPP;
1382 
1383 	if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1384 		return 0;
1385 
1386 	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1387 	if (x == NULL)
1388 		return 0;
1389 
1390 	spin_lock_bh(&x->lock);
1391 	if (x->km.state == XFRM_STATE_ACQ)
1392 		x->km.state = XFRM_STATE_ERROR;
1393 
1394 	spin_unlock_bh(&x->lock);
1395 	xfrm_state_put(x);
1396 	return 0;
1397 }
1398 
1399 static inline int event2poltype(int event)
1400 {
1401 	switch (event) {
1402 	case XFRM_MSG_DELPOLICY:
1403 		return SADB_X_SPDDELETE;
1404 	case XFRM_MSG_NEWPOLICY:
1405 		return SADB_X_SPDADD;
1406 	case XFRM_MSG_UPDPOLICY:
1407 		return SADB_X_SPDUPDATE;
1408 	case XFRM_MSG_POLEXPIRE:
1409 	//	return SADB_X_SPDEXPIRE;
1410 	default:
1411 		pr_err("pfkey: Unknown policy event %d\n", event);
1412 		break;
1413 	}
1414 
1415 	return 0;
1416 }
1417 
1418 static inline int event2keytype(int event)
1419 {
1420 	switch (event) {
1421 	case XFRM_MSG_DELSA:
1422 		return SADB_DELETE;
1423 	case XFRM_MSG_NEWSA:
1424 		return SADB_ADD;
1425 	case XFRM_MSG_UPDSA:
1426 		return SADB_UPDATE;
1427 	case XFRM_MSG_EXPIRE:
1428 		return SADB_EXPIRE;
1429 	default:
1430 		pr_err("pfkey: Unknown SA event %d\n", event);
1431 		break;
1432 	}
1433 
1434 	return 0;
1435 }
1436 
1437 /* ADD/UPD/DEL */
1438 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1439 {
1440 	struct sk_buff *skb;
1441 	struct sadb_msg *hdr;
1442 
1443 	skb = pfkey_xfrm_state2msg(x);
1444 
1445 	if (IS_ERR(skb))
1446 		return PTR_ERR(skb);
1447 
1448 	hdr = (struct sadb_msg *) skb->data;
1449 	hdr->sadb_msg_version = PF_KEY_V2;
1450 	hdr->sadb_msg_type = event2keytype(c->event);
1451 	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1452 	hdr->sadb_msg_errno = 0;
1453 	hdr->sadb_msg_reserved = 0;
1454 	hdr->sadb_msg_seq = c->seq;
1455 	hdr->sadb_msg_pid = c->portid;
1456 
1457 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1458 
1459 	return 0;
1460 }
1461 
1462 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1463 {
1464 	struct net *net = sock_net(sk);
1465 	struct xfrm_state *x;
1466 	int err;
1467 	struct km_event c;
1468 
1469 	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1470 	if (IS_ERR(x))
1471 		return PTR_ERR(x);
1472 
1473 	xfrm_state_hold(x);
1474 	if (hdr->sadb_msg_type == SADB_ADD)
1475 		err = xfrm_state_add(x);
1476 	else
1477 		err = xfrm_state_update(x);
1478 
1479 	xfrm_audit_state_add(x, err ? 0 : 1, true);
1480 
1481 	if (err < 0) {
1482 		x->km.state = XFRM_STATE_DEAD;
1483 		__xfrm_state_put(x);
1484 		goto out;
1485 	}
1486 
1487 	if (hdr->sadb_msg_type == SADB_ADD)
1488 		c.event = XFRM_MSG_NEWSA;
1489 	else
1490 		c.event = XFRM_MSG_UPDSA;
1491 	c.seq = hdr->sadb_msg_seq;
1492 	c.portid = hdr->sadb_msg_pid;
1493 	km_state_notify(x, &c);
1494 out:
1495 	xfrm_state_put(x);
1496 	return err;
1497 }
1498 
1499 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1500 {
1501 	struct net *net = sock_net(sk);
1502 	struct xfrm_state *x;
1503 	struct km_event c;
1504 	int err;
1505 
1506 	if (!ext_hdrs[SADB_EXT_SA-1] ||
1507 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1508 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1509 		return -EINVAL;
1510 
1511 	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1512 	if (x == NULL)
1513 		return -ESRCH;
1514 
1515 	if ((err = security_xfrm_state_delete(x)))
1516 		goto out;
1517 
1518 	if (xfrm_state_kern(x)) {
1519 		err = -EPERM;
1520 		goto out;
1521 	}
1522 
1523 	err = xfrm_state_delete(x);
1524 
1525 	if (err < 0)
1526 		goto out;
1527 
1528 	c.seq = hdr->sadb_msg_seq;
1529 	c.portid = hdr->sadb_msg_pid;
1530 	c.event = XFRM_MSG_DELSA;
1531 	km_state_notify(x, &c);
1532 out:
1533 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
1534 	xfrm_state_put(x);
1535 
1536 	return err;
1537 }
1538 
1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1540 {
1541 	struct net *net = sock_net(sk);
1542 	__u8 proto;
1543 	struct sk_buff *out_skb;
1544 	struct sadb_msg *out_hdr;
1545 	struct xfrm_state *x;
1546 
1547 	if (!ext_hdrs[SADB_EXT_SA-1] ||
1548 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550 		return -EINVAL;
1551 
1552 	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553 	if (x == NULL)
1554 		return -ESRCH;
1555 
1556 	out_skb = pfkey_xfrm_state2msg(x);
1557 	proto = x->id.proto;
1558 	xfrm_state_put(x);
1559 	if (IS_ERR(out_skb))
1560 		return  PTR_ERR(out_skb);
1561 
1562 	out_hdr = (struct sadb_msg *) out_skb->data;
1563 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1564 	out_hdr->sadb_msg_type = SADB_GET;
1565 	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1566 	out_hdr->sadb_msg_errno = 0;
1567 	out_hdr->sadb_msg_reserved = 0;
1568 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1569 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1570 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1571 
1572 	return 0;
1573 }
1574 
1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1576 					      gfp_t allocation)
1577 {
1578 	struct sk_buff *skb;
1579 	struct sadb_msg *hdr;
1580 	int len, auth_len, enc_len, i;
1581 
1582 	auth_len = xfrm_count_pfkey_auth_supported();
1583 	if (auth_len) {
1584 		auth_len *= sizeof(struct sadb_alg);
1585 		auth_len += sizeof(struct sadb_supported);
1586 	}
1587 
1588 	enc_len = xfrm_count_pfkey_enc_supported();
1589 	if (enc_len) {
1590 		enc_len *= sizeof(struct sadb_alg);
1591 		enc_len += sizeof(struct sadb_supported);
1592 	}
1593 
1594 	len = enc_len + auth_len + sizeof(struct sadb_msg);
1595 
1596 	skb = alloc_skb(len + 16, allocation);
1597 	if (!skb)
1598 		goto out_put_algs;
1599 
1600 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1601 	pfkey_hdr_dup(hdr, orig);
1602 	hdr->sadb_msg_errno = 0;
1603 	hdr->sadb_msg_len = len / sizeof(uint64_t);
1604 
1605 	if (auth_len) {
1606 		struct sadb_supported *sp;
1607 		struct sadb_alg *ap;
1608 
1609 		sp = (struct sadb_supported *) skb_put(skb, auth_len);
1610 		ap = (struct sadb_alg *) (sp + 1);
1611 
1612 		sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1613 		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1614 
1615 		for (i = 0; ; i++) {
1616 			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1617 			if (!aalg)
1618 				break;
1619 			if (!aalg->pfkey_supported)
1620 				continue;
1621 			if (aalg->available)
1622 				*ap++ = aalg->desc;
1623 		}
1624 	}
1625 
1626 	if (enc_len) {
1627 		struct sadb_supported *sp;
1628 		struct sadb_alg *ap;
1629 
1630 		sp = (struct sadb_supported *) skb_put(skb, enc_len);
1631 		ap = (struct sadb_alg *) (sp + 1);
1632 
1633 		sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1634 		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1635 
1636 		for (i = 0; ; i++) {
1637 			struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1638 			if (!ealg)
1639 				break;
1640 			if (!ealg->pfkey_supported)
1641 				continue;
1642 			if (ealg->available)
1643 				*ap++ = ealg->desc;
1644 		}
1645 	}
1646 
1647 out_put_algs:
1648 	return skb;
1649 }
1650 
1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1652 {
1653 	struct pfkey_sock *pfk = pfkey_sk(sk);
1654 	struct sk_buff *supp_skb;
1655 
1656 	if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1657 		return -EINVAL;
1658 
1659 	if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1660 		if (pfk->registered&(1<<hdr->sadb_msg_satype))
1661 			return -EEXIST;
1662 		pfk->registered |= (1<<hdr->sadb_msg_satype);
1663 	}
1664 
1665 	xfrm_probe_algs();
1666 
1667 	supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1668 	if (!supp_skb) {
1669 		if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1670 			pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1671 
1672 		return -ENOBUFS;
1673 	}
1674 
1675 	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1676 
1677 	return 0;
1678 }
1679 
1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 {
1682 	struct sk_buff *skb;
1683 	struct sadb_msg *hdr;
1684 
1685 	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1686 	if (!skb)
1687 		return -ENOBUFS;
1688 
1689 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1690 	memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1691 	hdr->sadb_msg_errno = (uint8_t) 0;
1692 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1693 
1694 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1695 }
1696 
1697 static int key_notify_sa_flush(const struct km_event *c)
1698 {
1699 	struct sk_buff *skb;
1700 	struct sadb_msg *hdr;
1701 
1702 	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1703 	if (!skb)
1704 		return -ENOBUFS;
1705 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1706 	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1707 	hdr->sadb_msg_type = SADB_FLUSH;
1708 	hdr->sadb_msg_seq = c->seq;
1709 	hdr->sadb_msg_pid = c->portid;
1710 	hdr->sadb_msg_version = PF_KEY_V2;
1711 	hdr->sadb_msg_errno = (uint8_t) 0;
1712 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713 	hdr->sadb_msg_reserved = 0;
1714 
1715 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716 
1717 	return 0;
1718 }
1719 
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722 	struct net *net = sock_net(sk);
1723 	unsigned int proto;
1724 	struct km_event c;
1725 	int err, err2;
1726 
1727 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1728 	if (proto == 0)
1729 		return -EINVAL;
1730 
1731 	err = xfrm_state_flush(net, proto, true);
1732 	err2 = unicast_flush_resp(sk, hdr);
1733 	if (err || err2) {
1734 		if (err == -ESRCH) /* empty table - go quietly */
1735 			err = 0;
1736 		return err ? err : err2;
1737 	}
1738 
1739 	c.data.proto = proto;
1740 	c.seq = hdr->sadb_msg_seq;
1741 	c.portid = hdr->sadb_msg_pid;
1742 	c.event = XFRM_MSG_FLUSHSA;
1743 	c.net = net;
1744 	km_state_notify(NULL, &c);
1745 
1746 	return 0;
1747 }
1748 
1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1750 {
1751 	struct pfkey_sock *pfk = ptr;
1752 	struct sk_buff *out_skb;
1753 	struct sadb_msg *out_hdr;
1754 
1755 	if (!pfkey_can_dump(&pfk->sk))
1756 		return -ENOBUFS;
1757 
1758 	out_skb = pfkey_xfrm_state2msg(x);
1759 	if (IS_ERR(out_skb))
1760 		return PTR_ERR(out_skb);
1761 
1762 	out_hdr = (struct sadb_msg *) out_skb->data;
1763 	out_hdr->sadb_msg_version = pfk->dump.msg_version;
1764 	out_hdr->sadb_msg_type = SADB_DUMP;
1765 	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1766 	out_hdr->sadb_msg_errno = 0;
1767 	out_hdr->sadb_msg_reserved = 0;
1768 	out_hdr->sadb_msg_seq = count + 1;
1769 	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1770 
1771 	if (pfk->dump.skb)
1772 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1773 				&pfk->sk, sock_net(&pfk->sk));
1774 	pfk->dump.skb = out_skb;
1775 
1776 	return 0;
1777 }
1778 
1779 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1780 {
1781 	struct net *net = sock_net(&pfk->sk);
1782 	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 }
1784 
1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1786 {
1787 	struct net *net = sock_net(&pfk->sk);
1788 
1789 	xfrm_state_walk_done(&pfk->dump.u.state, net);
1790 }
1791 
1792 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1793 {
1794 	u8 proto;
1795 	struct xfrm_address_filter *filter = NULL;
1796 	struct pfkey_sock *pfk = pfkey_sk(sk);
1797 
1798 	if (pfk->dump.dump != NULL)
1799 		return -EBUSY;
1800 
1801 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1802 	if (proto == 0)
1803 		return -EINVAL;
1804 
1805 	if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1806 		struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1807 
1808 		filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1809 		if (filter == NULL)
1810 			return -ENOMEM;
1811 
1812 		memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1813 		       sizeof(xfrm_address_t));
1814 		memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1815 		       sizeof(xfrm_address_t));
1816 		filter->family = xfilter->sadb_x_filter_family;
1817 		filter->splen = xfilter->sadb_x_filter_splen;
1818 		filter->dplen = xfilter->sadb_x_filter_dplen;
1819 	}
1820 
1821 	pfk->dump.msg_version = hdr->sadb_msg_version;
1822 	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1823 	pfk->dump.dump = pfkey_dump_sa;
1824 	pfk->dump.done = pfkey_dump_sa_done;
1825 	xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1826 
1827 	return pfkey_do_dump(pfk);
1828 }
1829 
1830 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1831 {
1832 	struct pfkey_sock *pfk = pfkey_sk(sk);
1833 	int satype = hdr->sadb_msg_satype;
1834 	bool reset_errno = false;
1835 
1836 	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1837 		reset_errno = true;
1838 		if (satype != 0 && satype != 1)
1839 			return -EINVAL;
1840 		pfk->promisc = satype;
1841 	}
1842 	if (reset_errno && skb_cloned(skb))
1843 		skb = skb_copy(skb, GFP_KERNEL);
1844 	else
1845 		skb = skb_clone(skb, GFP_KERNEL);
1846 
1847 	if (reset_errno && skb) {
1848 		struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1849 		new_hdr->sadb_msg_errno = 0;
1850 	}
1851 
1852 	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1853 	return 0;
1854 }
1855 
1856 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1857 {
1858 	int i;
1859 	u32 reqid = *(u32*)ptr;
1860 
1861 	for (i=0; i<xp->xfrm_nr; i++) {
1862 		if (xp->xfrm_vec[i].reqid == reqid)
1863 			return -EEXIST;
1864 	}
1865 	return 0;
1866 }
1867 
1868 static u32 gen_reqid(struct net *net)
1869 {
1870 	struct xfrm_policy_walk walk;
1871 	u32 start;
1872 	int rc;
1873 	static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1874 
1875 	start = reqid;
1876 	do {
1877 		++reqid;
1878 		if (reqid == 0)
1879 			reqid = IPSEC_MANUAL_REQID_MAX+1;
1880 		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1881 		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1882 		xfrm_policy_walk_done(&walk, net);
1883 		if (rc != -EEXIST)
1884 			return reqid;
1885 	} while (reqid != start);
1886 	return 0;
1887 }
1888 
1889 static int
1890 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1891 {
1892 	struct net *net = xp_net(xp);
1893 	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1894 	int mode;
1895 
1896 	if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1897 		return -ELOOP;
1898 
1899 	if (rq->sadb_x_ipsecrequest_mode == 0)
1900 		return -EINVAL;
1901 
1902 	t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1903 	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1904 		return -EINVAL;
1905 	t->mode = mode;
1906 	if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1907 		t->optional = 1;
1908 	else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1909 		t->reqid = rq->sadb_x_ipsecrequest_reqid;
1910 		if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1911 			t->reqid = 0;
1912 		if (!t->reqid && !(t->reqid = gen_reqid(net)))
1913 			return -ENOBUFS;
1914 	}
1915 
1916 	/* addresses present only in tunnel mode */
1917 	if (t->mode == XFRM_MODE_TUNNEL) {
1918 		u8 *sa = (u8 *) (rq + 1);
1919 		int family, socklen;
1920 
1921 		family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1922 						&t->saddr);
1923 		if (!family)
1924 			return -EINVAL;
1925 
1926 		socklen = pfkey_sockaddr_len(family);
1927 		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1928 					   &t->id.daddr) != family)
1929 			return -EINVAL;
1930 		t->encap_family = family;
1931 	} else
1932 		t->encap_family = xp->family;
1933 
1934 	/* No way to set this via kame pfkey */
1935 	t->allalgs = 1;
1936 	xp->xfrm_nr++;
1937 	return 0;
1938 }
1939 
1940 static int
1941 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1942 {
1943 	int err;
1944 	int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1945 	struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1946 
1947 	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1948 		return -EINVAL;
1949 
1950 	while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1951 		if ((err = parse_ipsecrequest(xp, rq)) < 0)
1952 			return err;
1953 		len -= rq->sadb_x_ipsecrequest_len;
1954 		rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1955 	}
1956 	return 0;
1957 }
1958 
1959 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1960 {
1961   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1962 
1963 	if (xfrm_ctx) {
1964 		int len = sizeof(struct sadb_x_sec_ctx);
1965 		len += xfrm_ctx->ctx_len;
1966 		return PFKEY_ALIGN8(len);
1967 	}
1968 	return 0;
1969 }
1970 
1971 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1972 {
1973 	const struct xfrm_tmpl *t;
1974 	int sockaddr_size = pfkey_sockaddr_size(xp->family);
1975 	int socklen = 0;
1976 	int i;
1977 
1978 	for (i=0; i<xp->xfrm_nr; i++) {
1979 		t = xp->xfrm_vec + i;
1980 		socklen += pfkey_sockaddr_len(t->encap_family);
1981 	}
1982 
1983 	return sizeof(struct sadb_msg) +
1984 		(sizeof(struct sadb_lifetime) * 3) +
1985 		(sizeof(struct sadb_address) * 2) +
1986 		(sockaddr_size * 2) +
1987 		sizeof(struct sadb_x_policy) +
1988 		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1989 		(socklen * 2) +
1990 		pfkey_xfrm_policy2sec_ctx_size(xp);
1991 }
1992 
1993 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1994 {
1995 	struct sk_buff *skb;
1996 	int size;
1997 
1998 	size = pfkey_xfrm_policy2msg_size(xp);
1999 
2000 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
2001 	if (skb == NULL)
2002 		return ERR_PTR(-ENOBUFS);
2003 
2004 	return skb;
2005 }
2006 
2007 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2008 {
2009 	struct sadb_msg *hdr;
2010 	struct sadb_address *addr;
2011 	struct sadb_lifetime *lifetime;
2012 	struct sadb_x_policy *pol;
2013 	struct sadb_x_sec_ctx *sec_ctx;
2014 	struct xfrm_sec_ctx *xfrm_ctx;
2015 	int i;
2016 	int size;
2017 	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2018 	int socklen = pfkey_sockaddr_len(xp->family);
2019 
2020 	size = pfkey_xfrm_policy2msg_size(xp);
2021 
2022 	/* call should fill header later */
2023 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2024 	memset(hdr, 0, size);	/* XXX do we need this ? */
2025 
2026 	/* src address */
2027 	addr = (struct sadb_address*) skb_put(skb,
2028 					      sizeof(struct sadb_address)+sockaddr_size);
2029 	addr->sadb_address_len =
2030 		(sizeof(struct sadb_address)+sockaddr_size)/
2031 			sizeof(uint64_t);
2032 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2033 	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2034 	addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2035 	addr->sadb_address_reserved = 0;
2036 	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2037 				 xp->selector.sport,
2038 				 (struct sockaddr *) (addr + 1),
2039 				 xp->family))
2040 		BUG();
2041 
2042 	/* dst address */
2043 	addr = (struct sadb_address*) skb_put(skb,
2044 					      sizeof(struct sadb_address)+sockaddr_size);
2045 	addr->sadb_address_len =
2046 		(sizeof(struct sadb_address)+sockaddr_size)/
2047 			sizeof(uint64_t);
2048 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2049 	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2050 	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2051 	addr->sadb_address_reserved = 0;
2052 
2053 	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2054 			    (struct sockaddr *) (addr + 1),
2055 			    xp->family);
2056 
2057 	/* hard time */
2058 	lifetime = (struct sadb_lifetime *)  skb_put(skb,
2059 						     sizeof(struct sadb_lifetime));
2060 	lifetime->sadb_lifetime_len =
2061 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2062 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2063 	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2064 	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2065 	lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2066 	lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2067 	/* soft time */
2068 	lifetime = (struct sadb_lifetime *)  skb_put(skb,
2069 						     sizeof(struct sadb_lifetime));
2070 	lifetime->sadb_lifetime_len =
2071 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2072 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2073 	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2074 	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2075 	lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2076 	lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2077 	/* current time */
2078 	lifetime = (struct sadb_lifetime *)  skb_put(skb,
2079 						     sizeof(struct sadb_lifetime));
2080 	lifetime->sadb_lifetime_len =
2081 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2082 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2083 	lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2084 	lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2085 	lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2086 	lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2087 
2088 	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2089 	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2090 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2091 	pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2092 	if (xp->action == XFRM_POLICY_ALLOW) {
2093 		if (xp->xfrm_nr)
2094 			pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2095 		else
2096 			pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2097 	}
2098 	pol->sadb_x_policy_dir = dir+1;
2099 	pol->sadb_x_policy_reserved = 0;
2100 	pol->sadb_x_policy_id = xp->index;
2101 	pol->sadb_x_policy_priority = xp->priority;
2102 
2103 	for (i=0; i<xp->xfrm_nr; i++) {
2104 		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2105 		struct sadb_x_ipsecrequest *rq;
2106 		int req_size;
2107 		int mode;
2108 
2109 		req_size = sizeof(struct sadb_x_ipsecrequest);
2110 		if (t->mode == XFRM_MODE_TUNNEL) {
2111 			socklen = pfkey_sockaddr_len(t->encap_family);
2112 			req_size += socklen * 2;
2113 		} else {
2114 			size -= 2*socklen;
2115 		}
2116 		rq = (void*)skb_put(skb, req_size);
2117 		pol->sadb_x_policy_len += req_size/8;
2118 		memset(rq, 0, sizeof(*rq));
2119 		rq->sadb_x_ipsecrequest_len = req_size;
2120 		rq->sadb_x_ipsecrequest_proto = t->id.proto;
2121 		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2122 			return -EINVAL;
2123 		rq->sadb_x_ipsecrequest_mode = mode;
2124 		rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2125 		if (t->reqid)
2126 			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2127 		if (t->optional)
2128 			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2129 		rq->sadb_x_ipsecrequest_reqid = t->reqid;
2130 
2131 		if (t->mode == XFRM_MODE_TUNNEL) {
2132 			u8 *sa = (void *)(rq + 1);
2133 			pfkey_sockaddr_fill(&t->saddr, 0,
2134 					    (struct sockaddr *)sa,
2135 					    t->encap_family);
2136 			pfkey_sockaddr_fill(&t->id.daddr, 0,
2137 					    (struct sockaddr *) (sa + socklen),
2138 					    t->encap_family);
2139 		}
2140 	}
2141 
2142 	/* security context */
2143 	if ((xfrm_ctx = xp->security)) {
2144 		int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2145 
2146 		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2147 		sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2148 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2149 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2150 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2151 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2152 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2153 		       xfrm_ctx->ctx_len);
2154 	}
2155 
2156 	hdr->sadb_msg_len = size / sizeof(uint64_t);
2157 	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2158 
2159 	return 0;
2160 }
2161 
2162 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2163 {
2164 	struct sk_buff *out_skb;
2165 	struct sadb_msg *out_hdr;
2166 	int err;
2167 
2168 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2169 	if (IS_ERR(out_skb))
2170 		return PTR_ERR(out_skb);
2171 
2172 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2173 	if (err < 0)
2174 		return err;
2175 
2176 	out_hdr = (struct sadb_msg *) out_skb->data;
2177 	out_hdr->sadb_msg_version = PF_KEY_V2;
2178 
2179 	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2180 		out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2181 	else
2182 		out_hdr->sadb_msg_type = event2poltype(c->event);
2183 	out_hdr->sadb_msg_errno = 0;
2184 	out_hdr->sadb_msg_seq = c->seq;
2185 	out_hdr->sadb_msg_pid = c->portid;
2186 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2187 	return 0;
2188 
2189 }
2190 
2191 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2192 {
2193 	struct net *net = sock_net(sk);
2194 	int err = 0;
2195 	struct sadb_lifetime *lifetime;
2196 	struct sadb_address *sa;
2197 	struct sadb_x_policy *pol;
2198 	struct xfrm_policy *xp;
2199 	struct km_event c;
2200 	struct sadb_x_sec_ctx *sec_ctx;
2201 
2202 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2203 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2204 	    !ext_hdrs[SADB_X_EXT_POLICY-1])
2205 		return -EINVAL;
2206 
2207 	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2208 	if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2209 		return -EINVAL;
2210 	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2211 		return -EINVAL;
2212 
2213 	xp = xfrm_policy_alloc(net, GFP_KERNEL);
2214 	if (xp == NULL)
2215 		return -ENOBUFS;
2216 
2217 	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2218 		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2219 	xp->priority = pol->sadb_x_policy_priority;
2220 
2221 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2222 	xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2223 	xp->selector.family = xp->family;
2224 	xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2225 	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226 	xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2227 	if (xp->selector.sport)
2228 		xp->selector.sport_mask = htons(0xffff);
2229 
2230 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2231 	pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2232 	xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2233 
2234 	/* Amusing, we set this twice.  KAME apps appear to set same value
2235 	 * in both addresses.
2236 	 */
2237 	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2238 
2239 	xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2240 	if (xp->selector.dport)
2241 		xp->selector.dport_mask = htons(0xffff);
2242 
2243 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2244 	if (sec_ctx != NULL) {
2245 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2246 
2247 		if (!uctx) {
2248 			err = -ENOBUFS;
2249 			goto out;
2250 		}
2251 
2252 		err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2253 		kfree(uctx);
2254 
2255 		if (err)
2256 			goto out;
2257 	}
2258 
2259 	xp->lft.soft_byte_limit = XFRM_INF;
2260 	xp->lft.hard_byte_limit = XFRM_INF;
2261 	xp->lft.soft_packet_limit = XFRM_INF;
2262 	xp->lft.hard_packet_limit = XFRM_INF;
2263 	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2264 		xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2265 		xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2266 		xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2267 		xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2268 	}
2269 	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2270 		xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2271 		xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2272 		xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2273 		xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2274 	}
2275 	xp->xfrm_nr = 0;
2276 	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2277 	    (err = parse_ipsecrequests(xp, pol)) < 0)
2278 		goto out;
2279 
2280 	err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2281 				 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2282 
2283 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2284 
2285 	if (err)
2286 		goto out;
2287 
2288 	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2289 		c.event = XFRM_MSG_UPDPOLICY;
2290 	else
2291 		c.event = XFRM_MSG_NEWPOLICY;
2292 
2293 	c.seq = hdr->sadb_msg_seq;
2294 	c.portid = hdr->sadb_msg_pid;
2295 
2296 	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2297 	xfrm_pol_put(xp);
2298 	return 0;
2299 
2300 out:
2301 	xp->walk.dead = 1;
2302 	xfrm_policy_destroy(xp);
2303 	return err;
2304 }
2305 
2306 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2307 {
2308 	struct net *net = sock_net(sk);
2309 	int err;
2310 	struct sadb_address *sa;
2311 	struct sadb_x_policy *pol;
2312 	struct xfrm_policy *xp;
2313 	struct xfrm_selector sel;
2314 	struct km_event c;
2315 	struct sadb_x_sec_ctx *sec_ctx;
2316 	struct xfrm_sec_ctx *pol_ctx = NULL;
2317 
2318 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2319 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2320 	    !ext_hdrs[SADB_X_EXT_POLICY-1])
2321 		return -EINVAL;
2322 
2323 	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2324 	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2325 		return -EINVAL;
2326 
2327 	memset(&sel, 0, sizeof(sel));
2328 
2329 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2330 	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2331 	sel.prefixlen_s = sa->sadb_address_prefixlen;
2332 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2333 	sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2334 	if (sel.sport)
2335 		sel.sport_mask = htons(0xffff);
2336 
2337 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2338 	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2339 	sel.prefixlen_d = sa->sadb_address_prefixlen;
2340 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2341 	sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2342 	if (sel.dport)
2343 		sel.dport_mask = htons(0xffff);
2344 
2345 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2346 	if (sec_ctx != NULL) {
2347 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2348 
2349 		if (!uctx)
2350 			return -ENOMEM;
2351 
2352 		err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2353 		kfree(uctx);
2354 		if (err)
2355 			return err;
2356 	}
2357 
2358 	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2359 				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2360 				   1, &err);
2361 	security_xfrm_policy_free(pol_ctx);
2362 	if (xp == NULL)
2363 		return -ENOENT;
2364 
2365 	xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2366 
2367 	if (err)
2368 		goto out;
2369 
2370 	c.seq = hdr->sadb_msg_seq;
2371 	c.portid = hdr->sadb_msg_pid;
2372 	c.data.byid = 0;
2373 	c.event = XFRM_MSG_DELPOLICY;
2374 	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2375 
2376 out:
2377 	xfrm_pol_put(xp);
2378 	if (err == 0)
2379 		xfrm_garbage_collect(net);
2380 	return err;
2381 }
2382 
2383 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2384 {
2385 	int err;
2386 	struct sk_buff *out_skb;
2387 	struct sadb_msg *out_hdr;
2388 	err = 0;
2389 
2390 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2391 	if (IS_ERR(out_skb)) {
2392 		err =  PTR_ERR(out_skb);
2393 		goto out;
2394 	}
2395 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2396 	if (err < 0)
2397 		goto out;
2398 
2399 	out_hdr = (struct sadb_msg *) out_skb->data;
2400 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2401 	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2402 	out_hdr->sadb_msg_satype = 0;
2403 	out_hdr->sadb_msg_errno = 0;
2404 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2405 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2406 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2407 	err = 0;
2408 
2409 out:
2410 	return err;
2411 }
2412 
2413 #ifdef CONFIG_NET_KEY_MIGRATE
2414 static int pfkey_sockaddr_pair_size(sa_family_t family)
2415 {
2416 	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2417 }
2418 
2419 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2420 			       xfrm_address_t *saddr, xfrm_address_t *daddr,
2421 			       u16 *family)
2422 {
2423 	int af, socklen;
2424 
2425 	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2426 		return -EINVAL;
2427 
2428 	af = pfkey_sockaddr_extract(sa, saddr);
2429 	if (!af)
2430 		return -EINVAL;
2431 
2432 	socklen = pfkey_sockaddr_len(af);
2433 	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2434 				   daddr) != af)
2435 		return -EINVAL;
2436 
2437 	*family = af;
2438 	return 0;
2439 }
2440 
2441 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2442 				    struct xfrm_migrate *m)
2443 {
2444 	int err;
2445 	struct sadb_x_ipsecrequest *rq2;
2446 	int mode;
2447 
2448 	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2449 	    len < rq1->sadb_x_ipsecrequest_len)
2450 		return -EINVAL;
2451 
2452 	/* old endoints */
2453 	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2454 				  rq1->sadb_x_ipsecrequest_len,
2455 				  &m->old_saddr, &m->old_daddr,
2456 				  &m->old_family);
2457 	if (err)
2458 		return err;
2459 
2460 	rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2461 	len -= rq1->sadb_x_ipsecrequest_len;
2462 
2463 	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2464 	    len < rq2->sadb_x_ipsecrequest_len)
2465 		return -EINVAL;
2466 
2467 	/* new endpoints */
2468 	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2469 				  rq2->sadb_x_ipsecrequest_len,
2470 				  &m->new_saddr, &m->new_daddr,
2471 				  &m->new_family);
2472 	if (err)
2473 		return err;
2474 
2475 	if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2476 	    rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2477 	    rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2478 		return -EINVAL;
2479 
2480 	m->proto = rq1->sadb_x_ipsecrequest_proto;
2481 	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2482 		return -EINVAL;
2483 	m->mode = mode;
2484 	m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2485 
2486 	return ((int)(rq1->sadb_x_ipsecrequest_len +
2487 		      rq2->sadb_x_ipsecrequest_len));
2488 }
2489 
2490 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2491 			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2492 {
2493 	int i, len, ret, err = -EINVAL;
2494 	u8 dir;
2495 	struct sadb_address *sa;
2496 	struct sadb_x_kmaddress *kma;
2497 	struct sadb_x_policy *pol;
2498 	struct sadb_x_ipsecrequest *rq;
2499 	struct xfrm_selector sel;
2500 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2501 	struct xfrm_kmaddress k;
2502 	struct net *net = sock_net(sk);
2503 
2504 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2505 				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2506 	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2507 		err = -EINVAL;
2508 		goto out;
2509 	}
2510 
2511 	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2512 	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2513 
2514 	if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2515 		err = -EINVAL;
2516 		goto out;
2517 	}
2518 
2519 	if (kma) {
2520 		/* convert sadb_x_kmaddress to xfrm_kmaddress */
2521 		k.reserved = kma->sadb_x_kmaddress_reserved;
2522 		ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2523 					  8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2524 					  &k.local, &k.remote, &k.family);
2525 		if (ret < 0) {
2526 			err = ret;
2527 			goto out;
2528 		}
2529 	}
2530 
2531 	dir = pol->sadb_x_policy_dir - 1;
2532 	memset(&sel, 0, sizeof(sel));
2533 
2534 	/* set source address info of selector */
2535 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2536 	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2537 	sel.prefixlen_s = sa->sadb_address_prefixlen;
2538 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2539 	sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2540 	if (sel.sport)
2541 		sel.sport_mask = htons(0xffff);
2542 
2543 	/* set destination address info of selector */
2544 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2545 	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2546 	sel.prefixlen_d = sa->sadb_address_prefixlen;
2547 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2548 	sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2549 	if (sel.dport)
2550 		sel.dport_mask = htons(0xffff);
2551 
2552 	rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2553 
2554 	/* extract ipsecrequests */
2555 	i = 0;
2556 	len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2557 
2558 	while (len > 0 && i < XFRM_MAX_DEPTH) {
2559 		ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2560 		if (ret < 0) {
2561 			err = ret;
2562 			goto out;
2563 		} else {
2564 			rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2565 			len -= ret;
2566 			i++;
2567 		}
2568 	}
2569 
2570 	if (!i || len > 0) {
2571 		err = -EINVAL;
2572 		goto out;
2573 	}
2574 
2575 	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2576 			    kma ? &k : NULL, net);
2577 
2578  out:
2579 	return err;
2580 }
2581 #else
2582 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2583 			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2584 {
2585 	return -ENOPROTOOPT;
2586 }
2587 #endif
2588 
2589 
2590 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2591 {
2592 	struct net *net = sock_net(sk);
2593 	unsigned int dir;
2594 	int err = 0, delete;
2595 	struct sadb_x_policy *pol;
2596 	struct xfrm_policy *xp;
2597 	struct km_event c;
2598 
2599 	if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2600 		return -EINVAL;
2601 
2602 	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2603 	if (dir >= XFRM_POLICY_MAX)
2604 		return -EINVAL;
2605 
2606 	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2607 	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2608 			      dir, pol->sadb_x_policy_id, delete, &err);
2609 	if (xp == NULL)
2610 		return -ENOENT;
2611 
2612 	if (delete) {
2613 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2614 
2615 		if (err)
2616 			goto out;
2617 		c.seq = hdr->sadb_msg_seq;
2618 		c.portid = hdr->sadb_msg_pid;
2619 		c.data.byid = 1;
2620 		c.event = XFRM_MSG_DELPOLICY;
2621 		km_policy_notify(xp, dir, &c);
2622 	} else {
2623 		err = key_pol_get_resp(sk, xp, hdr, dir);
2624 	}
2625 
2626 out:
2627 	xfrm_pol_put(xp);
2628 	if (delete && err == 0)
2629 		xfrm_garbage_collect(net);
2630 	return err;
2631 }
2632 
2633 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2634 {
2635 	struct pfkey_sock *pfk = ptr;
2636 	struct sk_buff *out_skb;
2637 	struct sadb_msg *out_hdr;
2638 	int err;
2639 
2640 	if (!pfkey_can_dump(&pfk->sk))
2641 		return -ENOBUFS;
2642 
2643 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2644 	if (IS_ERR(out_skb))
2645 		return PTR_ERR(out_skb);
2646 
2647 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2648 	if (err < 0)
2649 		return err;
2650 
2651 	out_hdr = (struct sadb_msg *) out_skb->data;
2652 	out_hdr->sadb_msg_version = pfk->dump.msg_version;
2653 	out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2654 	out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2655 	out_hdr->sadb_msg_errno = 0;
2656 	out_hdr->sadb_msg_seq = count + 1;
2657 	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2658 
2659 	if (pfk->dump.skb)
2660 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2661 				&pfk->sk, sock_net(&pfk->sk));
2662 	pfk->dump.skb = out_skb;
2663 
2664 	return 0;
2665 }
2666 
2667 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2668 {
2669 	struct net *net = sock_net(&pfk->sk);
2670 	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2671 }
2672 
2673 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2674 {
2675 	struct net *net = sock_net((struct sock *)pfk);
2676 
2677 	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2678 }
2679 
2680 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2681 {
2682 	struct pfkey_sock *pfk = pfkey_sk(sk);
2683 
2684 	if (pfk->dump.dump != NULL)
2685 		return -EBUSY;
2686 
2687 	pfk->dump.msg_version = hdr->sadb_msg_version;
2688 	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2689 	pfk->dump.dump = pfkey_dump_sp;
2690 	pfk->dump.done = pfkey_dump_sp_done;
2691 	xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2692 
2693 	return pfkey_do_dump(pfk);
2694 }
2695 
2696 static int key_notify_policy_flush(const struct km_event *c)
2697 {
2698 	struct sk_buff *skb_out;
2699 	struct sadb_msg *hdr;
2700 
2701 	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2702 	if (!skb_out)
2703 		return -ENOBUFS;
2704 	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2705 	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2706 	hdr->sadb_msg_seq = c->seq;
2707 	hdr->sadb_msg_pid = c->portid;
2708 	hdr->sadb_msg_version = PF_KEY_V2;
2709 	hdr->sadb_msg_errno = (uint8_t) 0;
2710 	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2712 	hdr->sadb_msg_reserved = 0;
2713 	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2714 	return 0;
2715 
2716 }
2717 
2718 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2719 {
2720 	struct net *net = sock_net(sk);
2721 	struct km_event c;
2722 	int err, err2;
2723 
2724 	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2725 	err2 = unicast_flush_resp(sk, hdr);
2726 	if (err || err2) {
2727 		if (err == -ESRCH) /* empty table - old silent behavior */
2728 			return 0;
2729 		return err;
2730 	}
2731 
2732 	c.data.type = XFRM_POLICY_TYPE_MAIN;
2733 	c.event = XFRM_MSG_FLUSHPOLICY;
2734 	c.portid = hdr->sadb_msg_pid;
2735 	c.seq = hdr->sadb_msg_seq;
2736 	c.net = net;
2737 	km_policy_notify(NULL, 0, &c);
2738 
2739 	return 0;
2740 }
2741 
2742 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2743 			     const struct sadb_msg *hdr, void * const *ext_hdrs);
2744 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2745 	[SADB_RESERVED]		= pfkey_reserved,
2746 	[SADB_GETSPI]		= pfkey_getspi,
2747 	[SADB_UPDATE]		= pfkey_add,
2748 	[SADB_ADD]		= pfkey_add,
2749 	[SADB_DELETE]		= pfkey_delete,
2750 	[SADB_GET]		= pfkey_get,
2751 	[SADB_ACQUIRE]		= pfkey_acquire,
2752 	[SADB_REGISTER]		= pfkey_register,
2753 	[SADB_EXPIRE]		= NULL,
2754 	[SADB_FLUSH]		= pfkey_flush,
2755 	[SADB_DUMP]		= pfkey_dump,
2756 	[SADB_X_PROMISC]	= pfkey_promisc,
2757 	[SADB_X_PCHANGE]	= NULL,
2758 	[SADB_X_SPDUPDATE]	= pfkey_spdadd,
2759 	[SADB_X_SPDADD]		= pfkey_spdadd,
2760 	[SADB_X_SPDDELETE]	= pfkey_spddelete,
2761 	[SADB_X_SPDGET]		= pfkey_spdget,
2762 	[SADB_X_SPDACQUIRE]	= NULL,
2763 	[SADB_X_SPDDUMP]	= pfkey_spddump,
2764 	[SADB_X_SPDFLUSH]	= pfkey_spdflush,
2765 	[SADB_X_SPDSETIDX]	= pfkey_spdadd,
2766 	[SADB_X_SPDDELETE2]	= pfkey_spdget,
2767 	[SADB_X_MIGRATE]	= pfkey_migrate,
2768 };
2769 
2770 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2771 {
2772 	void *ext_hdrs[SADB_EXT_MAX];
2773 	int err;
2774 
2775 	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2776 			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2777 
2778 	memset(ext_hdrs, 0, sizeof(ext_hdrs));
2779 	err = parse_exthdrs(skb, hdr, ext_hdrs);
2780 	if (!err) {
2781 		err = -EOPNOTSUPP;
2782 		if (pfkey_funcs[hdr->sadb_msg_type])
2783 			err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2784 	}
2785 	return err;
2786 }
2787 
2788 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2789 {
2790 	struct sadb_msg *hdr = NULL;
2791 
2792 	if (skb->len < sizeof(*hdr)) {
2793 		*errp = -EMSGSIZE;
2794 	} else {
2795 		hdr = (struct sadb_msg *) skb->data;
2796 		if (hdr->sadb_msg_version != PF_KEY_V2 ||
2797 		    hdr->sadb_msg_reserved != 0 ||
2798 		    (hdr->sadb_msg_type <= SADB_RESERVED ||
2799 		     hdr->sadb_msg_type > SADB_MAX)) {
2800 			hdr = NULL;
2801 			*errp = -EINVAL;
2802 		} else if (hdr->sadb_msg_len != (skb->len /
2803 						 sizeof(uint64_t)) ||
2804 			   hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2805 						sizeof(uint64_t))) {
2806 			hdr = NULL;
2807 			*errp = -EMSGSIZE;
2808 		} else {
2809 			*errp = 0;
2810 		}
2811 	}
2812 	return hdr;
2813 }
2814 
2815 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2816 				const struct xfrm_algo_desc *d)
2817 {
2818 	unsigned int id = d->desc.sadb_alg_id;
2819 
2820 	if (id >= sizeof(t->aalgos) * 8)
2821 		return 0;
2822 
2823 	return (t->aalgos >> id) & 1;
2824 }
2825 
2826 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2827 				const struct xfrm_algo_desc *d)
2828 {
2829 	unsigned int id = d->desc.sadb_alg_id;
2830 
2831 	if (id >= sizeof(t->ealgos) * 8)
2832 		return 0;
2833 
2834 	return (t->ealgos >> id) & 1;
2835 }
2836 
2837 static int count_ah_combs(const struct xfrm_tmpl *t)
2838 {
2839 	int i, sz = 0;
2840 
2841 	for (i = 0; ; i++) {
2842 		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2843 		if (!aalg)
2844 			break;
2845 		if (!aalg->pfkey_supported)
2846 			continue;
2847 		if (aalg_tmpl_set(t, aalg) && aalg->available)
2848 			sz += sizeof(struct sadb_comb);
2849 	}
2850 	return sz + sizeof(struct sadb_prop);
2851 }
2852 
2853 static int count_esp_combs(const struct xfrm_tmpl *t)
2854 {
2855 	int i, k, sz = 0;
2856 
2857 	for (i = 0; ; i++) {
2858 		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2859 		if (!ealg)
2860 			break;
2861 
2862 		if (!ealg->pfkey_supported)
2863 			continue;
2864 
2865 		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2866 			continue;
2867 
2868 		for (k = 1; ; k++) {
2869 			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2870 			if (!aalg)
2871 				break;
2872 
2873 			if (!aalg->pfkey_supported)
2874 				continue;
2875 
2876 			if (aalg_tmpl_set(t, aalg) && aalg->available)
2877 				sz += sizeof(struct sadb_comb);
2878 		}
2879 	}
2880 	return sz + sizeof(struct sadb_prop);
2881 }
2882 
2883 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2884 {
2885 	struct sadb_prop *p;
2886 	int i;
2887 
2888 	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2889 	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2890 	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2891 	p->sadb_prop_replay = 32;
2892 	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2893 
2894 	for (i = 0; ; i++) {
2895 		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2896 		if (!aalg)
2897 			break;
2898 
2899 		if (!aalg->pfkey_supported)
2900 			continue;
2901 
2902 		if (aalg_tmpl_set(t, aalg) && aalg->available) {
2903 			struct sadb_comb *c;
2904 			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2905 			memset(c, 0, sizeof(*c));
2906 			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2907 			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2908 			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2909 			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2910 			c->sadb_comb_hard_addtime = 24*60*60;
2911 			c->sadb_comb_soft_addtime = 20*60*60;
2912 			c->sadb_comb_hard_usetime = 8*60*60;
2913 			c->sadb_comb_soft_usetime = 7*60*60;
2914 		}
2915 	}
2916 }
2917 
2918 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2919 {
2920 	struct sadb_prop *p;
2921 	int i, k;
2922 
2923 	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2924 	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2925 	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2926 	p->sadb_prop_replay = 32;
2927 	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2928 
2929 	for (i=0; ; i++) {
2930 		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2931 		if (!ealg)
2932 			break;
2933 
2934 		if (!ealg->pfkey_supported)
2935 			continue;
2936 
2937 		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2938 			continue;
2939 
2940 		for (k = 1; ; k++) {
2941 			struct sadb_comb *c;
2942 			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2943 			if (!aalg)
2944 				break;
2945 			if (!aalg->pfkey_supported)
2946 				continue;
2947 			if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2948 				continue;
2949 			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2950 			memset(c, 0, sizeof(*c));
2951 			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2952 			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2953 			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2954 			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2955 			c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2956 			c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2957 			c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2958 			c->sadb_comb_hard_addtime = 24*60*60;
2959 			c->sadb_comb_soft_addtime = 20*60*60;
2960 			c->sadb_comb_hard_usetime = 8*60*60;
2961 			c->sadb_comb_soft_usetime = 7*60*60;
2962 		}
2963 	}
2964 }
2965 
2966 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2967 {
2968 	return 0;
2969 }
2970 
2971 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2972 {
2973 	struct sk_buff *out_skb;
2974 	struct sadb_msg *out_hdr;
2975 	int hard;
2976 	int hsc;
2977 
2978 	hard = c->data.hard;
2979 	if (hard)
2980 		hsc = 2;
2981 	else
2982 		hsc = 1;
2983 
2984 	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2985 	if (IS_ERR(out_skb))
2986 		return PTR_ERR(out_skb);
2987 
2988 	out_hdr = (struct sadb_msg *) out_skb->data;
2989 	out_hdr->sadb_msg_version = PF_KEY_V2;
2990 	out_hdr->sadb_msg_type = SADB_EXPIRE;
2991 	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2992 	out_hdr->sadb_msg_errno = 0;
2993 	out_hdr->sadb_msg_reserved = 0;
2994 	out_hdr->sadb_msg_seq = 0;
2995 	out_hdr->sadb_msg_pid = 0;
2996 
2997 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2998 	return 0;
2999 }
3000 
3001 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3002 {
3003 	struct net *net = x ? xs_net(x) : c->net;
3004 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3005 
3006 	if (atomic_read(&net_pfkey->socks_nr) == 0)
3007 		return 0;
3008 
3009 	switch (c->event) {
3010 	case XFRM_MSG_EXPIRE:
3011 		return key_notify_sa_expire(x, c);
3012 	case XFRM_MSG_DELSA:
3013 	case XFRM_MSG_NEWSA:
3014 	case XFRM_MSG_UPDSA:
3015 		return key_notify_sa(x, c);
3016 	case XFRM_MSG_FLUSHSA:
3017 		return key_notify_sa_flush(c);
3018 	case XFRM_MSG_NEWAE: /* not yet supported */
3019 		break;
3020 	default:
3021 		pr_err("pfkey: Unknown SA event %d\n", c->event);
3022 		break;
3023 	}
3024 
3025 	return 0;
3026 }
3027 
3028 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3029 {
3030 	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3031 		return 0;
3032 
3033 	switch (c->event) {
3034 	case XFRM_MSG_POLEXPIRE:
3035 		return key_notify_policy_expire(xp, c);
3036 	case XFRM_MSG_DELPOLICY:
3037 	case XFRM_MSG_NEWPOLICY:
3038 	case XFRM_MSG_UPDPOLICY:
3039 		return key_notify_policy(xp, dir, c);
3040 	case XFRM_MSG_FLUSHPOLICY:
3041 		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3042 			break;
3043 		return key_notify_policy_flush(c);
3044 	default:
3045 		pr_err("pfkey: Unknown policy event %d\n", c->event);
3046 		break;
3047 	}
3048 
3049 	return 0;
3050 }
3051 
3052 static u32 get_acqseq(void)
3053 {
3054 	u32 res;
3055 	static atomic_t acqseq;
3056 
3057 	do {
3058 		res = atomic_inc_return(&acqseq);
3059 	} while (!res);
3060 	return res;
3061 }
3062 
3063 static bool pfkey_is_alive(const struct km_event *c)
3064 {
3065 	struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3066 	struct sock *sk;
3067 	bool is_alive = false;
3068 
3069 	rcu_read_lock();
3070 	sk_for_each_rcu(sk, &net_pfkey->table) {
3071 		if (pfkey_sk(sk)->registered) {
3072 			is_alive = true;
3073 			break;
3074 		}
3075 	}
3076 	rcu_read_unlock();
3077 
3078 	return is_alive;
3079 }
3080 
3081 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3082 {
3083 	struct sk_buff *skb;
3084 	struct sadb_msg *hdr;
3085 	struct sadb_address *addr;
3086 	struct sadb_x_policy *pol;
3087 	int sockaddr_size;
3088 	int size;
3089 	struct sadb_x_sec_ctx *sec_ctx;
3090 	struct xfrm_sec_ctx *xfrm_ctx;
3091 	int ctx_size = 0;
3092 
3093 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
3094 	if (!sockaddr_size)
3095 		return -EINVAL;
3096 
3097 	size = sizeof(struct sadb_msg) +
3098 		(sizeof(struct sadb_address) * 2) +
3099 		(sockaddr_size * 2) +
3100 		sizeof(struct sadb_x_policy);
3101 
3102 	if (x->id.proto == IPPROTO_AH)
3103 		size += count_ah_combs(t);
3104 	else if (x->id.proto == IPPROTO_ESP)
3105 		size += count_esp_combs(t);
3106 
3107 	if ((xfrm_ctx = x->security)) {
3108 		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3109 		size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3110 	}
3111 
3112 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
3113 	if (skb == NULL)
3114 		return -ENOMEM;
3115 
3116 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3117 	hdr->sadb_msg_version = PF_KEY_V2;
3118 	hdr->sadb_msg_type = SADB_ACQUIRE;
3119 	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3120 	hdr->sadb_msg_len = size / sizeof(uint64_t);
3121 	hdr->sadb_msg_errno = 0;
3122 	hdr->sadb_msg_reserved = 0;
3123 	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3124 	hdr->sadb_msg_pid = 0;
3125 
3126 	/* src address */
3127 	addr = (struct sadb_address*) skb_put(skb,
3128 					      sizeof(struct sadb_address)+sockaddr_size);
3129 	addr->sadb_address_len =
3130 		(sizeof(struct sadb_address)+sockaddr_size)/
3131 			sizeof(uint64_t);
3132 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3133 	addr->sadb_address_proto = 0;
3134 	addr->sadb_address_reserved = 0;
3135 	addr->sadb_address_prefixlen =
3136 		pfkey_sockaddr_fill(&x->props.saddr, 0,
3137 				    (struct sockaddr *) (addr + 1),
3138 				    x->props.family);
3139 	if (!addr->sadb_address_prefixlen)
3140 		BUG();
3141 
3142 	/* dst address */
3143 	addr = (struct sadb_address*) skb_put(skb,
3144 					      sizeof(struct sadb_address)+sockaddr_size);
3145 	addr->sadb_address_len =
3146 		(sizeof(struct sadb_address)+sockaddr_size)/
3147 			sizeof(uint64_t);
3148 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3149 	addr->sadb_address_proto = 0;
3150 	addr->sadb_address_reserved = 0;
3151 	addr->sadb_address_prefixlen =
3152 		pfkey_sockaddr_fill(&x->id.daddr, 0,
3153 				    (struct sockaddr *) (addr + 1),
3154 				    x->props.family);
3155 	if (!addr->sadb_address_prefixlen)
3156 		BUG();
3157 
3158 	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3159 	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3160 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3161 	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3162 	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3163 	pol->sadb_x_policy_reserved = 0;
3164 	pol->sadb_x_policy_id = xp->index;
3165 	pol->sadb_x_policy_priority = xp->priority;
3166 
3167 	/* Set sadb_comb's. */
3168 	if (x->id.proto == IPPROTO_AH)
3169 		dump_ah_combs(skb, t);
3170 	else if (x->id.proto == IPPROTO_ESP)
3171 		dump_esp_combs(skb, t);
3172 
3173 	/* security context */
3174 	if (xfrm_ctx) {
3175 		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3176 				sizeof(struct sadb_x_sec_ctx) + ctx_size);
3177 		sec_ctx->sadb_x_sec_len =
3178 		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3179 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3180 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3181 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3182 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3183 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3184 		       xfrm_ctx->ctx_len);
3185 	}
3186 
3187 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3188 }
3189 
3190 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3191 						u8 *data, int len, int *dir)
3192 {
3193 	struct net *net = sock_net(sk);
3194 	struct xfrm_policy *xp;
3195 	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3196 	struct sadb_x_sec_ctx *sec_ctx;
3197 
3198 	switch (sk->sk_family) {
3199 	case AF_INET:
3200 		if (opt != IP_IPSEC_POLICY) {
3201 			*dir = -EOPNOTSUPP;
3202 			return NULL;
3203 		}
3204 		break;
3205 #if IS_ENABLED(CONFIG_IPV6)
3206 	case AF_INET6:
3207 		if (opt != IPV6_IPSEC_POLICY) {
3208 			*dir = -EOPNOTSUPP;
3209 			return NULL;
3210 		}
3211 		break;
3212 #endif
3213 	default:
3214 		*dir = -EINVAL;
3215 		return NULL;
3216 	}
3217 
3218 	*dir = -EINVAL;
3219 
3220 	if (len < sizeof(struct sadb_x_policy) ||
3221 	    pol->sadb_x_policy_len*8 > len ||
3222 	    pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3223 	    (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3224 		return NULL;
3225 
3226 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3227 	if (xp == NULL) {
3228 		*dir = -ENOBUFS;
3229 		return NULL;
3230 	}
3231 
3232 	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3233 		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3234 
3235 	xp->lft.soft_byte_limit = XFRM_INF;
3236 	xp->lft.hard_byte_limit = XFRM_INF;
3237 	xp->lft.soft_packet_limit = XFRM_INF;
3238 	xp->lft.hard_packet_limit = XFRM_INF;
3239 	xp->family = sk->sk_family;
3240 
3241 	xp->xfrm_nr = 0;
3242 	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3243 	    (*dir = parse_ipsecrequests(xp, pol)) < 0)
3244 		goto out;
3245 
3246 	/* security context too */
3247 	if (len >= (pol->sadb_x_policy_len*8 +
3248 	    sizeof(struct sadb_x_sec_ctx))) {
3249 		char *p = (char *)pol;
3250 		struct xfrm_user_sec_ctx *uctx;
3251 
3252 		p += pol->sadb_x_policy_len*8;
3253 		sec_ctx = (struct sadb_x_sec_ctx *)p;
3254 		if (len < pol->sadb_x_policy_len*8 +
3255 		    sec_ctx->sadb_x_sec_len) {
3256 			*dir = -EINVAL;
3257 			goto out;
3258 		}
3259 		if ((*dir = verify_sec_ctx_len(p)))
3260 			goto out;
3261 		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3262 		*dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3263 		kfree(uctx);
3264 
3265 		if (*dir)
3266 			goto out;
3267 	}
3268 
3269 	*dir = pol->sadb_x_policy_dir-1;
3270 	return xp;
3271 
3272 out:
3273 	xp->walk.dead = 1;
3274 	xfrm_policy_destroy(xp);
3275 	return NULL;
3276 }
3277 
3278 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3279 {
3280 	struct sk_buff *skb;
3281 	struct sadb_msg *hdr;
3282 	struct sadb_sa *sa;
3283 	struct sadb_address *addr;
3284 	struct sadb_x_nat_t_port *n_port;
3285 	int sockaddr_size;
3286 	int size;
3287 	__u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3288 	struct xfrm_encap_tmpl *natt = NULL;
3289 
3290 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
3291 	if (!sockaddr_size)
3292 		return -EINVAL;
3293 
3294 	if (!satype)
3295 		return -EINVAL;
3296 
3297 	if (!x->encap)
3298 		return -EINVAL;
3299 
3300 	natt = x->encap;
3301 
3302 	/* Build an SADB_X_NAT_T_NEW_MAPPING message:
3303 	 *
3304 	 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3305 	 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3306 	 */
3307 
3308 	size = sizeof(struct sadb_msg) +
3309 		sizeof(struct sadb_sa) +
3310 		(sizeof(struct sadb_address) * 2) +
3311 		(sockaddr_size * 2) +
3312 		(sizeof(struct sadb_x_nat_t_port) * 2);
3313 
3314 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
3315 	if (skb == NULL)
3316 		return -ENOMEM;
3317 
3318 	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3319 	hdr->sadb_msg_version = PF_KEY_V2;
3320 	hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3321 	hdr->sadb_msg_satype = satype;
3322 	hdr->sadb_msg_len = size / sizeof(uint64_t);
3323 	hdr->sadb_msg_errno = 0;
3324 	hdr->sadb_msg_reserved = 0;
3325 	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3326 	hdr->sadb_msg_pid = 0;
3327 
3328 	/* SA */
3329 	sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3330 	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3331 	sa->sadb_sa_exttype = SADB_EXT_SA;
3332 	sa->sadb_sa_spi = x->id.spi;
3333 	sa->sadb_sa_replay = 0;
3334 	sa->sadb_sa_state = 0;
3335 	sa->sadb_sa_auth = 0;
3336 	sa->sadb_sa_encrypt = 0;
3337 	sa->sadb_sa_flags = 0;
3338 
3339 	/* ADDRESS_SRC (old addr) */
3340 	addr = (struct sadb_address*)
3341 		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3342 	addr->sadb_address_len =
3343 		(sizeof(struct sadb_address)+sockaddr_size)/
3344 			sizeof(uint64_t);
3345 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3346 	addr->sadb_address_proto = 0;
3347 	addr->sadb_address_reserved = 0;
3348 	addr->sadb_address_prefixlen =
3349 		pfkey_sockaddr_fill(&x->props.saddr, 0,
3350 				    (struct sockaddr *) (addr + 1),
3351 				    x->props.family);
3352 	if (!addr->sadb_address_prefixlen)
3353 		BUG();
3354 
3355 	/* NAT_T_SPORT (old port) */
3356 	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3357 	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3358 	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3359 	n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3360 	n_port->sadb_x_nat_t_port_reserved = 0;
3361 
3362 	/* ADDRESS_DST (new addr) */
3363 	addr = (struct sadb_address*)
3364 		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3365 	addr->sadb_address_len =
3366 		(sizeof(struct sadb_address)+sockaddr_size)/
3367 			sizeof(uint64_t);
3368 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3369 	addr->sadb_address_proto = 0;
3370 	addr->sadb_address_reserved = 0;
3371 	addr->sadb_address_prefixlen =
3372 		pfkey_sockaddr_fill(ipaddr, 0,
3373 				    (struct sockaddr *) (addr + 1),
3374 				    x->props.family);
3375 	if (!addr->sadb_address_prefixlen)
3376 		BUG();
3377 
3378 	/* NAT_T_DPORT (new port) */
3379 	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3380 	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3381 	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3382 	n_port->sadb_x_nat_t_port_port = sport;
3383 	n_port->sadb_x_nat_t_port_reserved = 0;
3384 
3385 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3386 }
3387 
3388 #ifdef CONFIG_NET_KEY_MIGRATE
3389 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3390 			    const struct xfrm_selector *sel)
3391 {
3392 	struct sadb_address *addr;
3393 	addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3394 	addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3395 	addr->sadb_address_exttype = type;
3396 	addr->sadb_address_proto = sel->proto;
3397 	addr->sadb_address_reserved = 0;
3398 
3399 	switch (type) {
3400 	case SADB_EXT_ADDRESS_SRC:
3401 		addr->sadb_address_prefixlen = sel->prefixlen_s;
3402 		pfkey_sockaddr_fill(&sel->saddr, 0,
3403 				    (struct sockaddr *)(addr + 1),
3404 				    sel->family);
3405 		break;
3406 	case SADB_EXT_ADDRESS_DST:
3407 		addr->sadb_address_prefixlen = sel->prefixlen_d;
3408 		pfkey_sockaddr_fill(&sel->daddr, 0,
3409 				    (struct sockaddr *)(addr + 1),
3410 				    sel->family);
3411 		break;
3412 	default:
3413 		return -EINVAL;
3414 	}
3415 
3416 	return 0;
3417 }
3418 
3419 
3420 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3421 {
3422 	struct sadb_x_kmaddress *kma;
3423 	u8 *sa;
3424 	int family = k->family;
3425 	int socklen = pfkey_sockaddr_len(family);
3426 	int size_req;
3427 
3428 	size_req = (sizeof(struct sadb_x_kmaddress) +
3429 		    pfkey_sockaddr_pair_size(family));
3430 
3431 	kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3432 	memset(kma, 0, size_req);
3433 	kma->sadb_x_kmaddress_len = size_req / 8;
3434 	kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3435 	kma->sadb_x_kmaddress_reserved = k->reserved;
3436 
3437 	sa = (u8 *)(kma + 1);
3438 	if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3439 	    !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3440 		return -EINVAL;
3441 
3442 	return 0;
3443 }
3444 
3445 static int set_ipsecrequest(struct sk_buff *skb,
3446 			    uint8_t proto, uint8_t mode, int level,
3447 			    uint32_t reqid, uint8_t family,
3448 			    const xfrm_address_t *src, const xfrm_address_t *dst)
3449 {
3450 	struct sadb_x_ipsecrequest *rq;
3451 	u8 *sa;
3452 	int socklen = pfkey_sockaddr_len(family);
3453 	int size_req;
3454 
3455 	size_req = sizeof(struct sadb_x_ipsecrequest) +
3456 		   pfkey_sockaddr_pair_size(family);
3457 
3458 	rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3459 	memset(rq, 0, size_req);
3460 	rq->sadb_x_ipsecrequest_len = size_req;
3461 	rq->sadb_x_ipsecrequest_proto = proto;
3462 	rq->sadb_x_ipsecrequest_mode = mode;
3463 	rq->sadb_x_ipsecrequest_level = level;
3464 	rq->sadb_x_ipsecrequest_reqid = reqid;
3465 
3466 	sa = (u8 *) (rq + 1);
3467 	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3468 	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3469 		return -EINVAL;
3470 
3471 	return 0;
3472 }
3473 #endif
3474 
3475 #ifdef CONFIG_NET_KEY_MIGRATE
3476 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3477 			      const struct xfrm_migrate *m, int num_bundles,
3478 			      const struct xfrm_kmaddress *k)
3479 {
3480 	int i;
3481 	int sasize_sel;
3482 	int size = 0;
3483 	int size_pol = 0;
3484 	struct sk_buff *skb;
3485 	struct sadb_msg *hdr;
3486 	struct sadb_x_policy *pol;
3487 	const struct xfrm_migrate *mp;
3488 
3489 	if (type != XFRM_POLICY_TYPE_MAIN)
3490 		return 0;
3491 
3492 	if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3493 		return -EINVAL;
3494 
3495 	if (k != NULL) {
3496 		/* addresses for KM */
3497 		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3498 				     pfkey_sockaddr_pair_size(k->family));
3499 	}
3500 
3501 	/* selector */
3502 	sasize_sel = pfkey_sockaddr_size(sel->family);
3503 	if (!sasize_sel)
3504 		return -EINVAL;
3505 	size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3506 
3507 	/* policy info */
3508 	size_pol += sizeof(struct sadb_x_policy);
3509 
3510 	/* ipsecrequests */
3511 	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3512 		/* old locator pair */
3513 		size_pol += sizeof(struct sadb_x_ipsecrequest) +
3514 			    pfkey_sockaddr_pair_size(mp->old_family);
3515 		/* new locator pair */
3516 		size_pol += sizeof(struct sadb_x_ipsecrequest) +
3517 			    pfkey_sockaddr_pair_size(mp->new_family);
3518 	}
3519 
3520 	size += sizeof(struct sadb_msg) + size_pol;
3521 
3522 	/* alloc buffer */
3523 	skb = alloc_skb(size, GFP_ATOMIC);
3524 	if (skb == NULL)
3525 		return -ENOMEM;
3526 
3527 	hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3528 	hdr->sadb_msg_version = PF_KEY_V2;
3529 	hdr->sadb_msg_type = SADB_X_MIGRATE;
3530 	hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3531 	hdr->sadb_msg_len = size / 8;
3532 	hdr->sadb_msg_errno = 0;
3533 	hdr->sadb_msg_reserved = 0;
3534 	hdr->sadb_msg_seq = 0;
3535 	hdr->sadb_msg_pid = 0;
3536 
3537 	/* Addresses to be used by KM for negotiation, if ext is available */
3538 	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3539 		goto err;
3540 
3541 	/* selector src */
3542 	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3543 
3544 	/* selector dst */
3545 	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3546 
3547 	/* policy information */
3548 	pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3549 	pol->sadb_x_policy_len = size_pol / 8;
3550 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3551 	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3552 	pol->sadb_x_policy_dir = dir + 1;
3553 	pol->sadb_x_policy_reserved = 0;
3554 	pol->sadb_x_policy_id = 0;
3555 	pol->sadb_x_policy_priority = 0;
3556 
3557 	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3558 		/* old ipsecrequest */
3559 		int mode = pfkey_mode_from_xfrm(mp->mode);
3560 		if (mode < 0)
3561 			goto err;
3562 		if (set_ipsecrequest(skb, mp->proto, mode,
3563 				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3564 				     mp->reqid, mp->old_family,
3565 				     &mp->old_saddr, &mp->old_daddr) < 0)
3566 			goto err;
3567 
3568 		/* new ipsecrequest */
3569 		if (set_ipsecrequest(skb, mp->proto, mode,
3570 				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3571 				     mp->reqid, mp->new_family,
3572 				     &mp->new_saddr, &mp->new_daddr) < 0)
3573 			goto err;
3574 	}
3575 
3576 	/* broadcast migrate message to sockets */
3577 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3578 
3579 	return 0;
3580 
3581 err:
3582 	kfree_skb(skb);
3583 	return -EINVAL;
3584 }
3585 #else
3586 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3587 			      const struct xfrm_migrate *m, int num_bundles,
3588 			      const struct xfrm_kmaddress *k)
3589 {
3590 	return -ENOPROTOOPT;
3591 }
3592 #endif
3593 
3594 static int pfkey_sendmsg(struct kiocb *kiocb,
3595 			 struct socket *sock, struct msghdr *msg, size_t len)
3596 {
3597 	struct sock *sk = sock->sk;
3598 	struct sk_buff *skb = NULL;
3599 	struct sadb_msg *hdr = NULL;
3600 	int err;
3601 	struct net *net = sock_net(sk);
3602 
3603 	err = -EOPNOTSUPP;
3604 	if (msg->msg_flags & MSG_OOB)
3605 		goto out;
3606 
3607 	err = -EMSGSIZE;
3608 	if ((unsigned int)len > sk->sk_sndbuf - 32)
3609 		goto out;
3610 
3611 	err = -ENOBUFS;
3612 	skb = alloc_skb(len, GFP_KERNEL);
3613 	if (skb == NULL)
3614 		goto out;
3615 
3616 	err = -EFAULT;
3617 	if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3618 		goto out;
3619 
3620 	hdr = pfkey_get_base_msg(skb, &err);
3621 	if (!hdr)
3622 		goto out;
3623 
3624 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3625 	err = pfkey_process(sk, skb, hdr);
3626 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3627 
3628 out:
3629 	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3630 		err = 0;
3631 	kfree_skb(skb);
3632 
3633 	return err ? : len;
3634 }
3635 
3636 static int pfkey_recvmsg(struct kiocb *kiocb,
3637 			 struct socket *sock, struct msghdr *msg, size_t len,
3638 			 int flags)
3639 {
3640 	struct sock *sk = sock->sk;
3641 	struct pfkey_sock *pfk = pfkey_sk(sk);
3642 	struct sk_buff *skb;
3643 	int copied, err;
3644 
3645 	err = -EINVAL;
3646 	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3647 		goto out;
3648 
3649 	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3650 	if (skb == NULL)
3651 		goto out;
3652 
3653 	copied = skb->len;
3654 	if (copied > len) {
3655 		msg->msg_flags |= MSG_TRUNC;
3656 		copied = len;
3657 	}
3658 
3659 	skb_reset_transport_header(skb);
3660 	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3661 	if (err)
3662 		goto out_free;
3663 
3664 	sock_recv_ts_and_drops(msg, sk, skb);
3665 
3666 	err = (flags & MSG_TRUNC) ? skb->len : copied;
3667 
3668 	if (pfk->dump.dump != NULL &&
3669 	    3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3670 		pfkey_do_dump(pfk);
3671 
3672 out_free:
3673 	skb_free_datagram(sk, skb);
3674 out:
3675 	return err;
3676 }
3677 
3678 static const struct proto_ops pfkey_ops = {
3679 	.family		=	PF_KEY,
3680 	.owner		=	THIS_MODULE,
3681 	/* Operations that make no sense on pfkey sockets. */
3682 	.bind		=	sock_no_bind,
3683 	.connect	=	sock_no_connect,
3684 	.socketpair	=	sock_no_socketpair,
3685 	.accept		=	sock_no_accept,
3686 	.getname	=	sock_no_getname,
3687 	.ioctl		=	sock_no_ioctl,
3688 	.listen		=	sock_no_listen,
3689 	.shutdown	=	sock_no_shutdown,
3690 	.setsockopt	=	sock_no_setsockopt,
3691 	.getsockopt	=	sock_no_getsockopt,
3692 	.mmap		=	sock_no_mmap,
3693 	.sendpage	=	sock_no_sendpage,
3694 
3695 	/* Now the operations that really occur. */
3696 	.release	=	pfkey_release,
3697 	.poll		=	datagram_poll,
3698 	.sendmsg	=	pfkey_sendmsg,
3699 	.recvmsg	=	pfkey_recvmsg,
3700 };
3701 
3702 static const struct net_proto_family pfkey_family_ops = {
3703 	.family	=	PF_KEY,
3704 	.create	=	pfkey_create,
3705 	.owner	=	THIS_MODULE,
3706 };
3707 
3708 #ifdef CONFIG_PROC_FS
3709 static int pfkey_seq_show(struct seq_file *f, void *v)
3710 {
3711 	struct sock *s = sk_entry(v);
3712 
3713 	if (v == SEQ_START_TOKEN)
3714 		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3715 	else
3716 		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3717 			       s,
3718 			       atomic_read(&s->sk_refcnt),
3719 			       sk_rmem_alloc_get(s),
3720 			       sk_wmem_alloc_get(s),
3721 			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3722 			       sock_i_ino(s)
3723 			       );
3724 	return 0;
3725 }
3726 
3727 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3728 	__acquires(rcu)
3729 {
3730 	struct net *net = seq_file_net(f);
3731 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3732 
3733 	rcu_read_lock();
3734 	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3735 }
3736 
3737 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3738 {
3739 	struct net *net = seq_file_net(f);
3740 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3741 
3742 	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3743 }
3744 
3745 static void pfkey_seq_stop(struct seq_file *f, void *v)
3746 	__releases(rcu)
3747 {
3748 	rcu_read_unlock();
3749 }
3750 
3751 static const struct seq_operations pfkey_seq_ops = {
3752 	.start	= pfkey_seq_start,
3753 	.next	= pfkey_seq_next,
3754 	.stop	= pfkey_seq_stop,
3755 	.show	= pfkey_seq_show,
3756 };
3757 
3758 static int pfkey_seq_open(struct inode *inode, struct file *file)
3759 {
3760 	return seq_open_net(inode, file, &pfkey_seq_ops,
3761 			    sizeof(struct seq_net_private));
3762 }
3763 
3764 static const struct file_operations pfkey_proc_ops = {
3765 	.open	 = pfkey_seq_open,
3766 	.read	 = seq_read,
3767 	.llseek	 = seq_lseek,
3768 	.release = seq_release_net,
3769 };
3770 
3771 static int __net_init pfkey_init_proc(struct net *net)
3772 {
3773 	struct proc_dir_entry *e;
3774 
3775 	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3776 	if (e == NULL)
3777 		return -ENOMEM;
3778 
3779 	return 0;
3780 }
3781 
3782 static void __net_exit pfkey_exit_proc(struct net *net)
3783 {
3784 	remove_proc_entry("pfkey", net->proc_net);
3785 }
3786 #else
3787 static inline int pfkey_init_proc(struct net *net)
3788 {
3789 	return 0;
3790 }
3791 
3792 static inline void pfkey_exit_proc(struct net *net)
3793 {
3794 }
3795 #endif
3796 
3797 static struct xfrm_mgr pfkeyv2_mgr =
3798 {
3799 	.id		= "pfkeyv2",
3800 	.notify		= pfkey_send_notify,
3801 	.acquire	= pfkey_send_acquire,
3802 	.compile_policy	= pfkey_compile_policy,
3803 	.new_mapping	= pfkey_send_new_mapping,
3804 	.notify_policy	= pfkey_send_policy_notify,
3805 	.migrate	= pfkey_send_migrate,
3806 	.is_alive	= pfkey_is_alive,
3807 };
3808 
3809 static int __net_init pfkey_net_init(struct net *net)
3810 {
3811 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3812 	int rv;
3813 
3814 	INIT_HLIST_HEAD(&net_pfkey->table);
3815 	atomic_set(&net_pfkey->socks_nr, 0);
3816 
3817 	rv = pfkey_init_proc(net);
3818 
3819 	return rv;
3820 }
3821 
3822 static void __net_exit pfkey_net_exit(struct net *net)
3823 {
3824 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3825 
3826 	pfkey_exit_proc(net);
3827 	BUG_ON(!hlist_empty(&net_pfkey->table));
3828 }
3829 
3830 static struct pernet_operations pfkey_net_ops = {
3831 	.init = pfkey_net_init,
3832 	.exit = pfkey_net_exit,
3833 	.id   = &pfkey_net_id,
3834 	.size = sizeof(struct netns_pfkey),
3835 };
3836 
3837 static void __exit ipsec_pfkey_exit(void)
3838 {
3839 	xfrm_unregister_km(&pfkeyv2_mgr);
3840 	sock_unregister(PF_KEY);
3841 	unregister_pernet_subsys(&pfkey_net_ops);
3842 	proto_unregister(&key_proto);
3843 }
3844 
3845 static int __init ipsec_pfkey_init(void)
3846 {
3847 	int err = proto_register(&key_proto, 0);
3848 
3849 	if (err != 0)
3850 		goto out;
3851 
3852 	err = register_pernet_subsys(&pfkey_net_ops);
3853 	if (err != 0)
3854 		goto out_unregister_key_proto;
3855 	err = sock_register(&pfkey_family_ops);
3856 	if (err != 0)
3857 		goto out_unregister_pernet;
3858 	err = xfrm_register_km(&pfkeyv2_mgr);
3859 	if (err != 0)
3860 		goto out_sock_unregister;
3861 out:
3862 	return err;
3863 
3864 out_sock_unregister:
3865 	sock_unregister(PF_KEY);
3866 out_unregister_pernet:
3867 	unregister_pernet_subsys(&pfkey_net_ops);
3868 out_unregister_key_proto:
3869 	proto_unregister(&key_proto);
3870 	goto out;
3871 }
3872 
3873 module_init(ipsec_pfkey_init);
3874 module_exit(ipsec_pfkey_exit);
3875 MODULE_LICENSE("GPL");
3876 MODULE_ALIAS_NETPROTO(PF_KEY);
3877