xref: /linux/net/key/af_key.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net/key/af_key.c	An implementation of PF_KEYv2 sockets.
4  *
5  * Authors:	Maxim Giryaev	<gem@asplinux.ru>
6  *		David S. Miller	<davem@redhat.com>
7  *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8  *		Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9  *		Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
10  *		Derek Atkins <derek@ihtfp.com>
11  */
12 
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/socket.h>
17 #include <linux/pfkeyv2.h>
18 #include <linux/ipsec.h>
19 #include <linux/skbuff.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/in.h>
22 #include <linux/in6.h>
23 #include <linux/proc_fs.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <net/net_namespace.h>
27 #include <net/netns/generic.h>
28 #include <net/xfrm.h>
29 
30 #include <net/sock.h>
31 
32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
34 
35 static unsigned int pfkey_net_id __read_mostly;
36 struct netns_pfkey {
37 	/* List of all pfkey sockets. */
38 	struct hlist_head table;
39 	atomic_t socks_nr;
40 };
41 static DEFINE_MUTEX(pfkey_mutex);
42 
43 #define DUMMY_MARK 0
44 static const struct xfrm_mark dummy_mark = {0, 0};
45 struct pfkey_sock {
46 	/* struct sock must be the first member of struct pfkey_sock */
47 	struct sock	sk;
48 	int		registered;
49 	int		promisc;
50 
51 	struct {
52 		uint8_t		msg_version;
53 		uint32_t	msg_portid;
54 		int		(*dump)(struct pfkey_sock *sk);
55 		void		(*done)(struct pfkey_sock *sk);
56 		union {
57 			struct xfrm_policy_walk	policy;
58 			struct xfrm_state_walk	state;
59 		} u;
60 		struct sk_buff	*skb;
61 	} dump;
62 	struct mutex dump_lock;
63 };
64 
65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
66 			       xfrm_address_t *saddr, xfrm_address_t *daddr,
67 			       u16 *family);
68 
pfkey_sk(struct sock * sk)69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70 {
71 	return (struct pfkey_sock *)sk;
72 }
73 
pfkey_can_dump(const struct sock * sk)74 static int pfkey_can_dump(const struct sock *sk)
75 {
76 	if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
77 		return 1;
78 	return 0;
79 }
80 
pfkey_terminate_dump(struct pfkey_sock * pfk)81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
82 {
83 	if (pfk->dump.dump) {
84 		if (pfk->dump.skb) {
85 			kfree_skb(pfk->dump.skb);
86 			pfk->dump.skb = NULL;
87 		}
88 		pfk->dump.done(pfk);
89 		pfk->dump.dump = NULL;
90 		pfk->dump.done = NULL;
91 	}
92 }
93 
pfkey_sock_destruct(struct sock * sk)94 static void pfkey_sock_destruct(struct sock *sk)
95 {
96 	struct net *net = sock_net(sk);
97 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
98 
99 	pfkey_terminate_dump(pfkey_sk(sk));
100 	skb_queue_purge(&sk->sk_receive_queue);
101 
102 	if (!sock_flag(sk, SOCK_DEAD)) {
103 		pr_err("Attempt to release alive pfkey socket: %p\n", sk);
104 		return;
105 	}
106 
107 	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
108 	WARN_ON(refcount_read(&sk->sk_wmem_alloc));
109 
110 	atomic_dec(&net_pfkey->socks_nr);
111 }
112 
113 static const struct proto_ops pfkey_ops;
114 
pfkey_insert(struct sock * sk)115 static void pfkey_insert(struct sock *sk)
116 {
117 	struct net *net = sock_net(sk);
118 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
119 
120 	mutex_lock(&pfkey_mutex);
121 	sk_add_node_rcu(sk, &net_pfkey->table);
122 	mutex_unlock(&pfkey_mutex);
123 }
124 
pfkey_remove(struct sock * sk)125 static void pfkey_remove(struct sock *sk)
126 {
127 	mutex_lock(&pfkey_mutex);
128 	sk_del_node_init_rcu(sk);
129 	mutex_unlock(&pfkey_mutex);
130 }
131 
132 static struct proto key_proto = {
133 	.name	  = "KEY",
134 	.owner	  = THIS_MODULE,
135 	.obj_size = sizeof(struct pfkey_sock),
136 };
137 
pfkey_create(struct net * net,struct socket * sock,int protocol,int kern)138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
139 			int kern)
140 {
141 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
142 	struct sock *sk;
143 	struct pfkey_sock *pfk;
144 
145 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
146 		return -EPERM;
147 	if (sock->type != SOCK_RAW)
148 		return -ESOCKTNOSUPPORT;
149 	if (protocol != PF_KEY_V2)
150 		return -EPROTONOSUPPORT;
151 
152 	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
153 	if (sk == NULL)
154 		return -ENOMEM;
155 
156 	pfk = pfkey_sk(sk);
157 	mutex_init(&pfk->dump_lock);
158 
159 	sock->ops = &pfkey_ops;
160 	sock_init_data(sock, sk);
161 
162 	sk->sk_family = PF_KEY;
163 	sk->sk_destruct = pfkey_sock_destruct;
164 
165 	atomic_inc(&net_pfkey->socks_nr);
166 
167 	pfkey_insert(sk);
168 
169 	return 0;
170 }
171 
pfkey_release(struct socket * sock)172 static int pfkey_release(struct socket *sock)
173 {
174 	struct sock *sk = sock->sk;
175 
176 	if (!sk)
177 		return 0;
178 
179 	pfkey_remove(sk);
180 
181 	sock_orphan(sk);
182 	sock->sk = NULL;
183 	skb_queue_purge(&sk->sk_write_queue);
184 
185 	synchronize_rcu();
186 	sock_put(sk);
187 
188 	return 0;
189 }
190 
pfkey_broadcast_one(struct sk_buff * skb,gfp_t allocation,struct sock * sk)191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
192 			       struct sock *sk)
193 {
194 	int err = -ENOBUFS;
195 
196 	if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
197 		return err;
198 
199 	skb = skb_clone(skb, allocation);
200 
201 	if (skb) {
202 		skb_set_owner_r(skb, sk);
203 		skb_queue_tail(&sk->sk_receive_queue, skb);
204 		sk->sk_data_ready(sk);
205 		err = 0;
206 	}
207 	return err;
208 }
209 
210 /* Send SKB to all pfkey sockets matching selected criteria.  */
211 #define BROADCAST_ALL		0
212 #define BROADCAST_ONE		1
213 #define BROADCAST_REGISTERED	2
214 #define BROADCAST_PROMISC_ONLY	4
pfkey_broadcast(struct sk_buff * skb,gfp_t allocation,int broadcast_flags,struct sock * one_sk,struct net * net)215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
216 			   int broadcast_flags, struct sock *one_sk,
217 			   struct net *net)
218 {
219 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
220 	struct sock *sk;
221 	int err = -ESRCH;
222 
223 	/* XXX Do we need something like netlink_overrun?  I think
224 	 * XXX PF_KEY socket apps will not mind current behavior.
225 	 */
226 	if (!skb)
227 		return -ENOMEM;
228 
229 	rcu_read_lock();
230 	sk_for_each_rcu(sk, &net_pfkey->table) {
231 		struct pfkey_sock *pfk = pfkey_sk(sk);
232 		int err2;
233 
234 		/* Yes, it means that if you are meant to receive this
235 		 * pfkey message you receive it twice as promiscuous
236 		 * socket.
237 		 */
238 		if (pfk->promisc)
239 			pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
240 
241 		/* the exact target will be processed later */
242 		if (sk == one_sk)
243 			continue;
244 		if (broadcast_flags != BROADCAST_ALL) {
245 			if (broadcast_flags & BROADCAST_PROMISC_ONLY)
246 				continue;
247 			if ((broadcast_flags & BROADCAST_REGISTERED) &&
248 			    !pfk->registered)
249 				continue;
250 			if (broadcast_flags & BROADCAST_ONE)
251 				continue;
252 		}
253 
254 		err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
255 
256 		/* Error is cleared after successful sending to at least one
257 		 * registered KM */
258 		if ((broadcast_flags & BROADCAST_REGISTERED) && err)
259 			err = err2;
260 	}
261 	rcu_read_unlock();
262 
263 	if (one_sk != NULL)
264 		err = pfkey_broadcast_one(skb, allocation, one_sk);
265 
266 	kfree_skb(skb);
267 	return err;
268 }
269 
pfkey_do_dump(struct pfkey_sock * pfk)270 static int pfkey_do_dump(struct pfkey_sock *pfk)
271 {
272 	struct sadb_msg *hdr;
273 	int rc;
274 
275 	mutex_lock(&pfk->dump_lock);
276 	if (!pfk->dump.dump) {
277 		rc = 0;
278 		goto out;
279 	}
280 
281 	rc = pfk->dump.dump(pfk);
282 	if (rc == -ENOBUFS) {
283 		rc = 0;
284 		goto out;
285 	}
286 
287 	if (pfk->dump.skb) {
288 		if (!pfkey_can_dump(&pfk->sk)) {
289 			rc = 0;
290 			goto out;
291 		}
292 
293 		hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 		hdr->sadb_msg_seq = 0;
295 		hdr->sadb_msg_errno = rc;
296 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 				&pfk->sk, sock_net(&pfk->sk));
298 		pfk->dump.skb = NULL;
299 	}
300 
301 	pfkey_terminate_dump(pfk);
302 
303 out:
304 	mutex_unlock(&pfk->dump_lock);
305 	return rc;
306 }
307 
pfkey_hdr_dup(struct sadb_msg * new,const struct sadb_msg * orig)308 static inline void pfkey_hdr_dup(struct sadb_msg *new,
309 				 const struct sadb_msg *orig)
310 {
311 	*new = *orig;
312 }
313 
pfkey_error(const struct sadb_msg * orig,int err,struct sock * sk)314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
315 {
316 	struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
317 	struct sadb_msg *hdr;
318 
319 	if (!skb)
320 		return -ENOBUFS;
321 
322 	/* Woe be to the platform trying to support PFKEY yet
323 	 * having normal errnos outside the 1-255 range, inclusive.
324 	 */
325 	err = -err;
326 	if (err == ERESTARTSYS ||
327 	    err == ERESTARTNOHAND ||
328 	    err == ERESTARTNOINTR)
329 		err = EINTR;
330 	if (err >= 512)
331 		err = EINVAL;
332 	BUG_ON(err <= 0 || err >= 256);
333 
334 	hdr = skb_put(skb, sizeof(struct sadb_msg));
335 	pfkey_hdr_dup(hdr, orig);
336 	hdr->sadb_msg_errno = (uint8_t) err;
337 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
338 			     sizeof(uint64_t));
339 
340 	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
341 
342 	return 0;
343 }
344 
345 static const u8 sadb_ext_min_len[] = {
346 	[SADB_EXT_RESERVED]		= (u8) 0,
347 	[SADB_EXT_SA]			= (u8) sizeof(struct sadb_sa),
348 	[SADB_EXT_LIFETIME_CURRENT]	= (u8) sizeof(struct sadb_lifetime),
349 	[SADB_EXT_LIFETIME_HARD]	= (u8) sizeof(struct sadb_lifetime),
350 	[SADB_EXT_LIFETIME_SOFT]	= (u8) sizeof(struct sadb_lifetime),
351 	[SADB_EXT_ADDRESS_SRC]		= (u8) sizeof(struct sadb_address),
352 	[SADB_EXT_ADDRESS_DST]		= (u8) sizeof(struct sadb_address),
353 	[SADB_EXT_ADDRESS_PROXY]	= (u8) sizeof(struct sadb_address),
354 	[SADB_EXT_KEY_AUTH]		= (u8) sizeof(struct sadb_key),
355 	[SADB_EXT_KEY_ENCRYPT]		= (u8) sizeof(struct sadb_key),
356 	[SADB_EXT_IDENTITY_SRC]		= (u8) sizeof(struct sadb_ident),
357 	[SADB_EXT_IDENTITY_DST]		= (u8) sizeof(struct sadb_ident),
358 	[SADB_EXT_SENSITIVITY]		= (u8) sizeof(struct sadb_sens),
359 	[SADB_EXT_PROPOSAL]		= (u8) sizeof(struct sadb_prop),
360 	[SADB_EXT_SUPPORTED_AUTH]	= (u8) sizeof(struct sadb_supported),
361 	[SADB_EXT_SUPPORTED_ENCRYPT]	= (u8) sizeof(struct sadb_supported),
362 	[SADB_EXT_SPIRANGE]		= (u8) sizeof(struct sadb_spirange),
363 	[SADB_X_EXT_KMPRIVATE]		= (u8) sizeof(struct sadb_x_kmprivate),
364 	[SADB_X_EXT_POLICY]		= (u8) sizeof(struct sadb_x_policy),
365 	[SADB_X_EXT_SA2]		= (u8) sizeof(struct sadb_x_sa2),
366 	[SADB_X_EXT_NAT_T_TYPE]		= (u8) sizeof(struct sadb_x_nat_t_type),
367 	[SADB_X_EXT_NAT_T_SPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
368 	[SADB_X_EXT_NAT_T_DPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
369 	[SADB_X_EXT_NAT_T_OA]		= (u8) sizeof(struct sadb_address),
370 	[SADB_X_EXT_SEC_CTX]		= (u8) sizeof(struct sadb_x_sec_ctx),
371 	[SADB_X_EXT_KMADDRESS]		= (u8) sizeof(struct sadb_x_kmaddress),
372 	[SADB_X_EXT_FILTER]		= (u8) sizeof(struct sadb_x_filter),
373 };
374 
375 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
verify_address_len(const void * p)376 static int verify_address_len(const void *p)
377 {
378 	const struct sadb_address *sp = p;
379 	const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
380 	const struct sockaddr_in *sin;
381 #if IS_ENABLED(CONFIG_IPV6)
382 	const struct sockaddr_in6 *sin6;
383 #endif
384 	int len;
385 
386 	if (sp->sadb_address_len <
387 	    DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
388 			 sizeof(uint64_t)))
389 		return -EINVAL;
390 
391 	switch (addr->sa_family) {
392 	case AF_INET:
393 		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
394 		if (sp->sadb_address_len != len ||
395 		    sp->sadb_address_prefixlen > 32)
396 			return -EINVAL;
397 		break;
398 #if IS_ENABLED(CONFIG_IPV6)
399 	case AF_INET6:
400 		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
401 		if (sp->sadb_address_len != len ||
402 		    sp->sadb_address_prefixlen > 128)
403 			return -EINVAL;
404 		break;
405 #endif
406 	default:
407 		/* It is user using kernel to keep track of security
408 		 * associations for another protocol, such as
409 		 * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
410 		 * lengths.
411 		 *
412 		 * XXX Actually, association/policy database is not yet
413 		 * XXX able to cope with arbitrary sockaddr families.
414 		 * XXX When it can, remove this -EINVAL.  -DaveM
415 		 */
416 		return -EINVAL;
417 	}
418 
419 	return 0;
420 }
421 
sadb_key_len(const struct sadb_key * key)422 static inline int sadb_key_len(const struct sadb_key *key)
423 {
424 	int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
425 
426 	return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
427 			    sizeof(uint64_t));
428 }
429 
verify_key_len(const void * p)430 static int verify_key_len(const void *p)
431 {
432 	const struct sadb_key *key = p;
433 
434 	if (sadb_key_len(key) > key->sadb_key_len)
435 		return -EINVAL;
436 
437 	return 0;
438 }
439 
pfkey_sec_ctx_len(const struct sadb_x_sec_ctx * sec_ctx)440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
441 {
442 	return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 			    sec_ctx->sadb_x_ctx_len,
444 			    sizeof(uint64_t));
445 }
446 
verify_sec_ctx_len(const void * p)447 static inline int verify_sec_ctx_len(const void *p)
448 {
449 	const struct sadb_x_sec_ctx *sec_ctx = p;
450 	int len = sec_ctx->sadb_x_ctx_len;
451 
452 	if (len > PAGE_SIZE)
453 		return -EINVAL;
454 
455 	len = pfkey_sec_ctx_len(sec_ctx);
456 
457 	if (sec_ctx->sadb_x_sec_len != len)
458 		return -EINVAL;
459 
460 	return 0;
461 }
462 
pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx * sec_ctx,gfp_t gfp)463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 								     gfp_t gfp)
465 {
466 	struct xfrm_user_sec_ctx *uctx = NULL;
467 	int ctx_size = sec_ctx->sadb_x_ctx_len;
468 
469 	uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
470 
471 	if (!uctx)
472 		return NULL;
473 
474 	uctx->len = pfkey_sec_ctx_len(sec_ctx);
475 	uctx->exttype = sec_ctx->sadb_x_sec_exttype;
476 	uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
477 	uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
478 	uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
479 	memcpy(uctx + 1, sec_ctx + 1,
480 	       uctx->ctx_len);
481 
482 	return uctx;
483 }
484 
present_and_same_family(const struct sadb_address * src,const struct sadb_address * dst)485 static int present_and_same_family(const struct sadb_address *src,
486 				   const struct sadb_address *dst)
487 {
488 	const struct sockaddr *s_addr, *d_addr;
489 
490 	if (!src || !dst)
491 		return 0;
492 
493 	s_addr = (const struct sockaddr *)(src + 1);
494 	d_addr = (const struct sockaddr *)(dst + 1);
495 	if (s_addr->sa_family != d_addr->sa_family)
496 		return 0;
497 	if (s_addr->sa_family != AF_INET
498 #if IS_ENABLED(CONFIG_IPV6)
499 	    && s_addr->sa_family != AF_INET6
500 #endif
501 		)
502 		return 0;
503 
504 	return 1;
505 }
506 
parse_exthdrs(struct sk_buff * skb,const struct sadb_msg * hdr,void ** ext_hdrs)507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
508 {
509 	const char *p = (char *) hdr;
510 	int len = skb->len;
511 
512 	len -= sizeof(*hdr);
513 	p += sizeof(*hdr);
514 	while (len > 0) {
515 		const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
516 		uint16_t ext_type;
517 		int ext_len;
518 
519 		if (len < sizeof(*ehdr))
520 			return -EINVAL;
521 
522 		ext_len  = ehdr->sadb_ext_len;
523 		ext_len *= sizeof(uint64_t);
524 		ext_type = ehdr->sadb_ext_type;
525 		if (ext_len < sizeof(uint64_t) ||
526 		    ext_len > len ||
527 		    ext_type == SADB_EXT_RESERVED)
528 			return -EINVAL;
529 
530 		if (ext_type <= SADB_EXT_MAX) {
531 			int min = (int) sadb_ext_min_len[ext_type];
532 			if (ext_len < min)
533 				return -EINVAL;
534 			if (ext_hdrs[ext_type-1] != NULL)
535 				return -EINVAL;
536 			switch (ext_type) {
537 			case SADB_EXT_ADDRESS_SRC:
538 			case SADB_EXT_ADDRESS_DST:
539 			case SADB_EXT_ADDRESS_PROXY:
540 			case SADB_X_EXT_NAT_T_OA:
541 				if (verify_address_len(p))
542 					return -EINVAL;
543 				break;
544 			case SADB_X_EXT_SEC_CTX:
545 				if (verify_sec_ctx_len(p))
546 					return -EINVAL;
547 				break;
548 			case SADB_EXT_KEY_AUTH:
549 			case SADB_EXT_KEY_ENCRYPT:
550 				if (verify_key_len(p))
551 					return -EINVAL;
552 				break;
553 			default:
554 				break;
555 			}
556 			ext_hdrs[ext_type-1] = (void *) p;
557 		}
558 		p   += ext_len;
559 		len -= ext_len;
560 	}
561 
562 	return 0;
563 }
564 
565 static uint16_t
pfkey_satype2proto(uint8_t satype)566 pfkey_satype2proto(uint8_t satype)
567 {
568 	switch (satype) {
569 	case SADB_SATYPE_UNSPEC:
570 		return IPSEC_PROTO_ANY;
571 	case SADB_SATYPE_AH:
572 		return IPPROTO_AH;
573 	case SADB_SATYPE_ESP:
574 		return IPPROTO_ESP;
575 	case SADB_X_SATYPE_IPCOMP:
576 		return IPPROTO_COMP;
577 	default:
578 		return 0;
579 	}
580 	/* NOTREACHED */
581 }
582 
583 static uint8_t
pfkey_proto2satype(uint16_t proto)584 pfkey_proto2satype(uint16_t proto)
585 {
586 	switch (proto) {
587 	case IPPROTO_AH:
588 		return SADB_SATYPE_AH;
589 	case IPPROTO_ESP:
590 		return SADB_SATYPE_ESP;
591 	case IPPROTO_COMP:
592 		return SADB_X_SATYPE_IPCOMP;
593 	default:
594 		return 0;
595 	}
596 	/* NOTREACHED */
597 }
598 
599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
600  * say specifically 'just raw sockets' as we encode them as 255.
601  */
602 
pfkey_proto_to_xfrm(uint8_t proto)603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
604 {
605 	return proto == IPSEC_PROTO_ANY ? 0 : proto;
606 }
607 
pfkey_proto_from_xfrm(uint8_t proto)608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
609 {
610 	return proto ? proto : IPSEC_PROTO_ANY;
611 }
612 
pfkey_sockaddr_len(sa_family_t family)613 static inline int pfkey_sockaddr_len(sa_family_t family)
614 {
615 	switch (family) {
616 	case AF_INET:
617 		return sizeof(struct sockaddr_in);
618 #if IS_ENABLED(CONFIG_IPV6)
619 	case AF_INET6:
620 		return sizeof(struct sockaddr_in6);
621 #endif
622 	}
623 	return 0;
624 }
625 
626 static
pfkey_sockaddr_extract(const struct sockaddr * sa,xfrm_address_t * xaddr)627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
628 {
629 	switch (sa->sa_family) {
630 	case AF_INET:
631 		xaddr->a4 =
632 			((struct sockaddr_in *)sa)->sin_addr.s_addr;
633 		return AF_INET;
634 #if IS_ENABLED(CONFIG_IPV6)
635 	case AF_INET6:
636 		memcpy(xaddr->a6,
637 		       &((struct sockaddr_in6 *)sa)->sin6_addr,
638 		       sizeof(struct in6_addr));
639 		return AF_INET6;
640 #endif
641 	}
642 	return 0;
643 }
644 
645 static
pfkey_sadb_addr2xfrm_addr(const struct sadb_address * addr,xfrm_address_t * xaddr)646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
647 {
648 	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
649 				      xaddr);
650 }
651 
pfkey_xfrm_state_lookup(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)652 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
653 {
654 	const struct sadb_sa *sa;
655 	const struct sadb_address *addr;
656 	uint16_t proto;
657 	unsigned short family;
658 	xfrm_address_t *xaddr;
659 
660 	sa = ext_hdrs[SADB_EXT_SA - 1];
661 	if (sa == NULL)
662 		return NULL;
663 
664 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
665 	if (proto == 0)
666 		return NULL;
667 
668 	/* sadb_address_len should be checked by caller */
669 	addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
670 	if (addr == NULL)
671 		return NULL;
672 
673 	family = ((const struct sockaddr *)(addr + 1))->sa_family;
674 	switch (family) {
675 	case AF_INET:
676 		xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
677 		break;
678 #if IS_ENABLED(CONFIG_IPV6)
679 	case AF_INET6:
680 		xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
681 		break;
682 #endif
683 	default:
684 		xaddr = NULL;
685 	}
686 
687 	if (!xaddr)
688 		return NULL;
689 
690 	return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
691 }
692 
693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
694 
695 static int
pfkey_sockaddr_size(sa_family_t family)696 pfkey_sockaddr_size(sa_family_t family)
697 {
698 	return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
699 }
700 
pfkey_mode_from_xfrm(int mode)701 static inline int pfkey_mode_from_xfrm(int mode)
702 {
703 	switch(mode) {
704 	case XFRM_MODE_TRANSPORT:
705 		return IPSEC_MODE_TRANSPORT;
706 	case XFRM_MODE_TUNNEL:
707 		return IPSEC_MODE_TUNNEL;
708 	case XFRM_MODE_BEET:
709 		return IPSEC_MODE_BEET;
710 	default:
711 		return -1;
712 	}
713 }
714 
pfkey_mode_to_xfrm(int mode)715 static inline int pfkey_mode_to_xfrm(int mode)
716 {
717 	switch(mode) {
718 	case IPSEC_MODE_ANY:	/*XXX*/
719 	case IPSEC_MODE_TRANSPORT:
720 		return XFRM_MODE_TRANSPORT;
721 	case IPSEC_MODE_TUNNEL:
722 		return XFRM_MODE_TUNNEL;
723 	case IPSEC_MODE_BEET:
724 		return XFRM_MODE_BEET;
725 	default:
726 		return -1;
727 	}
728 }
729 
pfkey_sockaddr_fill(const xfrm_address_t * xaddr,__be16 port,struct sockaddr * sa,unsigned short family)730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
731 					struct sockaddr *sa,
732 					unsigned short family)
733 {
734 	switch (family) {
735 	case AF_INET:
736 	    {
737 		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
738 		sin->sin_family = AF_INET;
739 		sin->sin_port = port;
740 		sin->sin_addr.s_addr = xaddr->a4;
741 		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
742 		return 32;
743 	    }
744 #if IS_ENABLED(CONFIG_IPV6)
745 	case AF_INET6:
746 	    {
747 		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
748 		sin6->sin6_family = AF_INET6;
749 		sin6->sin6_port = port;
750 		sin6->sin6_flowinfo = 0;
751 		sin6->sin6_addr = xaddr->in6;
752 		sin6->sin6_scope_id = 0;
753 		return 128;
754 	    }
755 #endif
756 	}
757 	return 0;
758 }
759 
__pfkey_xfrm_state2msg(const struct xfrm_state * x,int add_keys,int hsc)760 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
761 					      int add_keys, int hsc)
762 {
763 	struct sk_buff *skb;
764 	struct sadb_msg *hdr;
765 	struct sadb_sa *sa;
766 	struct sadb_lifetime *lifetime;
767 	struct sadb_address *addr;
768 	struct sadb_key *key;
769 	struct sadb_x_sa2 *sa2;
770 	struct sadb_x_sec_ctx *sec_ctx;
771 	struct xfrm_sec_ctx *xfrm_ctx;
772 	int ctx_size = 0;
773 	int size;
774 	int auth_key_size = 0;
775 	int encrypt_key_size = 0;
776 	int sockaddr_size;
777 	struct xfrm_encap_tmpl *natt = NULL;
778 	int mode;
779 
780 	/* address family check */
781 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
782 	if (!sockaddr_size)
783 		return ERR_PTR(-EINVAL);
784 
785 	/* base, SA, (lifetime (HSC),) address(SD), (address(P),)
786 	   key(AE), (identity(SD),) (sensitivity)> */
787 	size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
788 		sizeof(struct sadb_lifetime) +
789 		((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
790 		((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
791 			sizeof(struct sadb_address)*2 +
792 				sockaddr_size*2 +
793 					sizeof(struct sadb_x_sa2);
794 
795 	if ((xfrm_ctx = x->security)) {
796 		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
797 		size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
798 	}
799 
800 	/* identity & sensitivity */
801 	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
802 		size += sizeof(struct sadb_address) + sockaddr_size;
803 
804 	if (add_keys) {
805 		if (x->aalg && x->aalg->alg_key_len) {
806 			auth_key_size =
807 				PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
808 			size += sizeof(struct sadb_key) + auth_key_size;
809 		}
810 		if (x->ealg && x->ealg->alg_key_len) {
811 			encrypt_key_size =
812 				PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
813 			size += sizeof(struct sadb_key) + encrypt_key_size;
814 		}
815 	}
816 	if (x->encap)
817 		natt = x->encap;
818 
819 	if (natt && natt->encap_type) {
820 		size += sizeof(struct sadb_x_nat_t_type);
821 		size += sizeof(struct sadb_x_nat_t_port);
822 		size += sizeof(struct sadb_x_nat_t_port);
823 	}
824 
825 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
826 	if (skb == NULL)
827 		return ERR_PTR(-ENOBUFS);
828 
829 	/* call should fill header later */
830 	hdr = skb_put(skb, sizeof(struct sadb_msg));
831 	memset(hdr, 0, size);	/* XXX do we need this ? */
832 	hdr->sadb_msg_len = size / sizeof(uint64_t);
833 
834 	/* sa */
835 	sa = skb_put(skb, sizeof(struct sadb_sa));
836 	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
837 	sa->sadb_sa_exttype = SADB_EXT_SA;
838 	sa->sadb_sa_spi = x->id.spi;
839 	sa->sadb_sa_replay = x->props.replay_window;
840 	switch (x->km.state) {
841 	case XFRM_STATE_VALID:
842 		sa->sadb_sa_state = x->km.dying ?
843 			SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
844 		break;
845 	case XFRM_STATE_ACQ:
846 		sa->sadb_sa_state = SADB_SASTATE_LARVAL;
847 		break;
848 	default:
849 		sa->sadb_sa_state = SADB_SASTATE_DEAD;
850 		break;
851 	}
852 	sa->sadb_sa_auth = 0;
853 	if (x->aalg) {
854 		struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
855 		sa->sadb_sa_auth = (a && a->pfkey_supported) ?
856 					a->desc.sadb_alg_id : 0;
857 	}
858 	sa->sadb_sa_encrypt = 0;
859 	BUG_ON(x->ealg && x->calg);
860 	if (x->ealg) {
861 		struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
862 		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
863 					a->desc.sadb_alg_id : 0;
864 	}
865 	/* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
866 	if (x->calg) {
867 		struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
868 		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
869 					a->desc.sadb_alg_id : 0;
870 	}
871 
872 	sa->sadb_sa_flags = 0;
873 	if (x->props.flags & XFRM_STATE_NOECN)
874 		sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
875 	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
876 		sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
877 	if (x->props.flags & XFRM_STATE_NOPMTUDISC)
878 		sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
879 
880 	/* hard time */
881 	if (hsc & 2) {
882 		lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
883 		lifetime->sadb_lifetime_len =
884 			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
885 		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
886 		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
887 		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
888 		lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
889 		lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
890 	}
891 	/* soft time */
892 	if (hsc & 1) {
893 		lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
894 		lifetime->sadb_lifetime_len =
895 			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
896 		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
897 		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
898 		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
899 		lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
900 		lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
901 	}
902 	/* current time */
903 	lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
904 	lifetime->sadb_lifetime_len =
905 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
906 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
907 	lifetime->sadb_lifetime_allocations = x->curlft.packets;
908 	lifetime->sadb_lifetime_bytes = x->curlft.bytes;
909 	lifetime->sadb_lifetime_addtime = x->curlft.add_time;
910 	lifetime->sadb_lifetime_usetime = x->curlft.use_time;
911 	/* src address */
912 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
913 	addr->sadb_address_len =
914 		(sizeof(struct sadb_address)+sockaddr_size)/
915 			sizeof(uint64_t);
916 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
917 	/* "if the ports are non-zero, then the sadb_address_proto field,
918 	   normally zero, MUST be filled in with the transport
919 	   protocol's number." - RFC2367 */
920 	addr->sadb_address_proto = 0;
921 	addr->sadb_address_reserved = 0;
922 
923 	addr->sadb_address_prefixlen =
924 		pfkey_sockaddr_fill(&x->props.saddr, 0,
925 				    (struct sockaddr *) (addr + 1),
926 				    x->props.family);
927 	BUG_ON(!addr->sadb_address_prefixlen);
928 
929 	/* dst address */
930 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
931 	addr->sadb_address_len =
932 		(sizeof(struct sadb_address)+sockaddr_size)/
933 			sizeof(uint64_t);
934 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
935 	addr->sadb_address_proto = 0;
936 	addr->sadb_address_reserved = 0;
937 
938 	addr->sadb_address_prefixlen =
939 		pfkey_sockaddr_fill(&x->id.daddr, 0,
940 				    (struct sockaddr *) (addr + 1),
941 				    x->props.family);
942 	BUG_ON(!addr->sadb_address_prefixlen);
943 
944 	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
945 			     x->props.family)) {
946 		addr = skb_put(skb,
947 			       sizeof(struct sadb_address) + sockaddr_size);
948 		addr->sadb_address_len =
949 			(sizeof(struct sadb_address)+sockaddr_size)/
950 			sizeof(uint64_t);
951 		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
952 		addr->sadb_address_proto =
953 			pfkey_proto_from_xfrm(x->sel.proto);
954 		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
955 		addr->sadb_address_reserved = 0;
956 
957 		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
958 				    (struct sockaddr *) (addr + 1),
959 				    x->props.family);
960 	}
961 
962 	/* auth key */
963 	if (add_keys && auth_key_size) {
964 		key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
965 		key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
966 			sizeof(uint64_t);
967 		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
968 		key->sadb_key_bits = x->aalg->alg_key_len;
969 		key->sadb_key_reserved = 0;
970 		memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
971 	}
972 	/* encrypt key */
973 	if (add_keys && encrypt_key_size) {
974 		key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
975 		key->sadb_key_len = (sizeof(struct sadb_key) +
976 				     encrypt_key_size) / sizeof(uint64_t);
977 		key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
978 		key->sadb_key_bits = x->ealg->alg_key_len;
979 		key->sadb_key_reserved = 0;
980 		memcpy(key + 1, x->ealg->alg_key,
981 		       (x->ealg->alg_key_len+7)/8);
982 	}
983 
984 	/* sa */
985 	sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
986 	sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
987 	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
988 	if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
989 		kfree_skb(skb);
990 		return ERR_PTR(-EINVAL);
991 	}
992 	sa2->sadb_x_sa2_mode = mode;
993 	sa2->sadb_x_sa2_reserved1 = 0;
994 	sa2->sadb_x_sa2_reserved2 = 0;
995 	sa2->sadb_x_sa2_sequence = 0;
996 	sa2->sadb_x_sa2_reqid = x->props.reqid;
997 
998 	if (natt && natt->encap_type) {
999 		struct sadb_x_nat_t_type *n_type;
1000 		struct sadb_x_nat_t_port *n_port;
1001 
1002 		/* type */
1003 		n_type = skb_put(skb, sizeof(*n_type));
1004 		n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1005 		n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1006 		n_type->sadb_x_nat_t_type_type = natt->encap_type;
1007 		n_type->sadb_x_nat_t_type_reserved[0] = 0;
1008 		n_type->sadb_x_nat_t_type_reserved[1] = 0;
1009 		n_type->sadb_x_nat_t_type_reserved[2] = 0;
1010 
1011 		/* source port */
1012 		n_port = skb_put(skb, sizeof(*n_port));
1013 		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1014 		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1015 		n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1016 		n_port->sadb_x_nat_t_port_reserved = 0;
1017 
1018 		/* dest port */
1019 		n_port = skb_put(skb, sizeof(*n_port));
1020 		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1021 		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1022 		n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1023 		n_port->sadb_x_nat_t_port_reserved = 0;
1024 	}
1025 
1026 	/* security context */
1027 	if (xfrm_ctx) {
1028 		sec_ctx = skb_put(skb,
1029 				  sizeof(struct sadb_x_sec_ctx) + ctx_size);
1030 		sec_ctx->sadb_x_sec_len =
1031 		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1032 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1033 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1034 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1035 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1036 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1037 		       xfrm_ctx->ctx_len);
1038 	}
1039 
1040 	return skb;
1041 }
1042 
1043 
pfkey_xfrm_state2msg(const struct xfrm_state * x)1044 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1045 {
1046 	struct sk_buff *skb;
1047 
1048 	skb = __pfkey_xfrm_state2msg(x, 1, 3);
1049 
1050 	return skb;
1051 }
1052 
pfkey_xfrm_state2msg_expire(const struct xfrm_state * x,int hsc)1053 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1054 							  int hsc)
1055 {
1056 	return __pfkey_xfrm_state2msg(x, 0, hsc);
1057 }
1058 
pfkey_msg2xfrm_state(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)1059 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1060 						const struct sadb_msg *hdr,
1061 						void * const *ext_hdrs)
1062 {
1063 	struct xfrm_state *x;
1064 	const struct sadb_lifetime *lifetime;
1065 	const struct sadb_sa *sa;
1066 	const struct sadb_key *key;
1067 	const struct sadb_x_sec_ctx *sec_ctx;
1068 	uint16_t proto;
1069 	int err;
1070 
1071 
1072 	sa = ext_hdrs[SADB_EXT_SA - 1];
1073 	if (!sa ||
1074 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076 		return ERR_PTR(-EINVAL);
1077 	if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078 	    !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079 		return ERR_PTR(-EINVAL);
1080 	if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081 	    !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082 		return ERR_PTR(-EINVAL);
1083 	if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084 	    !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085 		return ERR_PTR(-EINVAL);
1086 
1087 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088 	if (proto == 0)
1089 		return ERR_PTR(-EINVAL);
1090 
1091 	/* default error is no buffer space */
1092 	err = -ENOBUFS;
1093 
1094 	/* RFC2367:
1095 
1096    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1097    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1098    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1099    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1100    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1101    not true.
1102 
1103 	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
1104 	   Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1105 	 */
1106 	if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1107 	    (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1108 	     sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1109 	    sa->sadb_sa_encrypt > SADB_EALG_MAX)
1110 		return ERR_PTR(-EINVAL);
1111 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1112 	if (key != NULL &&
1113 	    sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1114 	    key->sadb_key_bits == 0)
1115 		return ERR_PTR(-EINVAL);
1116 	key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1117 	if (key != NULL &&
1118 	    sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1119 	    key->sadb_key_bits == 0)
1120 		return ERR_PTR(-EINVAL);
1121 
1122 	x = xfrm_state_alloc(net);
1123 	if (x == NULL)
1124 		return ERR_PTR(-ENOBUFS);
1125 
1126 	x->id.proto = proto;
1127 	x->id.spi = sa->sadb_sa_spi;
1128 	x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1129 					(sizeof(x->replay.bitmap) * 8));
1130 	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1131 		x->props.flags |= XFRM_STATE_NOECN;
1132 	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1133 		x->props.flags |= XFRM_STATE_DECAP_DSCP;
1134 	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1135 		x->props.flags |= XFRM_STATE_NOPMTUDISC;
1136 
1137 	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1138 	if (lifetime != NULL) {
1139 		x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1140 		x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1141 		x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1142 		x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1143 	}
1144 	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1145 	if (lifetime != NULL) {
1146 		x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1147 		x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1148 		x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1149 		x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1150 	}
1151 
1152 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1153 	if (sec_ctx != NULL) {
1154 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1155 
1156 		if (!uctx)
1157 			goto out;
1158 
1159 		err = security_xfrm_state_alloc(x, uctx);
1160 		kfree(uctx);
1161 
1162 		if (err)
1163 			goto out;
1164 	}
1165 
1166 	err = -ENOBUFS;
1167 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1168 	if (sa->sadb_sa_auth) {
1169 		int keysize = 0;
1170 		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1171 		if (!a || !a->pfkey_supported) {
1172 			err = -ENOSYS;
1173 			goto out;
1174 		}
1175 		if (key)
1176 			keysize = (key->sadb_key_bits + 7) / 8;
1177 		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1178 		if (!x->aalg) {
1179 			err = -ENOMEM;
1180 			goto out;
1181 		}
1182 		strcpy(x->aalg->alg_name, a->name);
1183 		x->aalg->alg_key_len = 0;
1184 		if (key) {
1185 			x->aalg->alg_key_len = key->sadb_key_bits;
1186 			memcpy(x->aalg->alg_key, key+1, keysize);
1187 		}
1188 		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1189 		x->props.aalgo = sa->sadb_sa_auth;
1190 		/* x->algo.flags = sa->sadb_sa_flags; */
1191 	}
1192 	if (sa->sadb_sa_encrypt) {
1193 		if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1194 			struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1195 			if (!a || !a->pfkey_supported) {
1196 				err = -ENOSYS;
1197 				goto out;
1198 			}
1199 			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1200 			if (!x->calg) {
1201 				err = -ENOMEM;
1202 				goto out;
1203 			}
1204 			strcpy(x->calg->alg_name, a->name);
1205 			x->props.calgo = sa->sadb_sa_encrypt;
1206 		} else {
1207 			int keysize = 0;
1208 			struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1209 			if (!a || !a->pfkey_supported) {
1210 				err = -ENOSYS;
1211 				goto out;
1212 			}
1213 			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1214 			if (key)
1215 				keysize = (key->sadb_key_bits + 7) / 8;
1216 			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1217 			if (!x->ealg) {
1218 				err = -ENOMEM;
1219 				goto out;
1220 			}
1221 			strcpy(x->ealg->alg_name, a->name);
1222 			x->ealg->alg_key_len = 0;
1223 			if (key) {
1224 				x->ealg->alg_key_len = key->sadb_key_bits;
1225 				memcpy(x->ealg->alg_key, key+1, keysize);
1226 			}
1227 			x->props.ealgo = sa->sadb_sa_encrypt;
1228 			x->geniv = a->uinfo.encr.geniv;
1229 		}
1230 	}
1231 	/* x->algo.flags = sa->sadb_sa_flags; */
1232 
1233 	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1234 						    &x->props.saddr);
1235 	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1236 				  &x->id.daddr);
1237 
1238 	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1239 		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1240 		int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241 		if (mode < 0) {
1242 			err = -EINVAL;
1243 			goto out;
1244 		}
1245 		x->props.mode = mode;
1246 		x->props.reqid = sa2->sadb_x_sa2_reqid;
1247 	}
1248 
1249 	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1250 		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1251 
1252 		/* Nobody uses this, but we try. */
1253 		x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254 		x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255 	}
1256 
1257 	if (!x->sel.family)
1258 		x->sel.family = x->props.family;
1259 
1260 	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1261 		const struct sadb_x_nat_t_type* n_type;
1262 		struct xfrm_encap_tmpl *natt;
1263 
1264 		x->encap = kzalloc(sizeof(*x->encap), GFP_KERNEL);
1265 		if (!x->encap) {
1266 			err = -ENOMEM;
1267 			goto out;
1268 		}
1269 
1270 		natt = x->encap;
1271 		n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1272 		natt->encap_type = n_type->sadb_x_nat_t_type_type;
1273 
1274 		if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1275 			const struct sadb_x_nat_t_port *n_port =
1276 				ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1277 			natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1278 		}
1279 		if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1280 			const struct sadb_x_nat_t_port *n_port =
1281 				ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282 			natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283 		}
1284 	}
1285 
1286 	err = xfrm_init_state(x);
1287 	if (err)
1288 		goto out;
1289 
1290 	x->km.seq = hdr->sadb_msg_seq;
1291 	return x;
1292 
1293 out:
1294 	x->km.state = XFRM_STATE_DEAD;
1295 	xfrm_state_put(x);
1296 	return ERR_PTR(err);
1297 }
1298 
pfkey_reserved(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1299 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1300 {
1301 	return -EOPNOTSUPP;
1302 }
1303 
pfkey_getspi(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1304 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1305 {
1306 	struct net *net = sock_net(sk);
1307 	struct sk_buff *resp_skb;
1308 	struct sadb_x_sa2 *sa2;
1309 	struct sadb_address *saddr, *daddr;
1310 	struct sadb_msg *out_hdr;
1311 	struct sadb_spirange *range;
1312 	struct xfrm_state *x = NULL;
1313 	int mode;
1314 	int err;
1315 	u32 min_spi, max_spi;
1316 	u32 reqid;
1317 	u8 proto;
1318 	unsigned short family;
1319 	xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1320 
1321 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1322 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1323 		return -EINVAL;
1324 
1325 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1326 	if (proto == 0)
1327 		return -EINVAL;
1328 
1329 	if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1330 		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1331 		if (mode < 0)
1332 			return -EINVAL;
1333 		reqid = sa2->sadb_x_sa2_reqid;
1334 	} else {
1335 		mode = 0;
1336 		reqid = 0;
1337 	}
1338 
1339 	saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1340 	daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1341 
1342 	family = ((struct sockaddr *)(saddr + 1))->sa_family;
1343 	switch (family) {
1344 	case AF_INET:
1345 		xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1346 		xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1347 		break;
1348 #if IS_ENABLED(CONFIG_IPV6)
1349 	case AF_INET6:
1350 		xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1351 		xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1352 		break;
1353 #endif
1354 	}
1355 
1356 	if (hdr->sadb_msg_seq) {
1357 		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1358 		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1359 			xfrm_state_put(x);
1360 			x = NULL;
1361 		}
1362 	}
1363 
1364 	if (!x)
1365 		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1366 
1367 	if (x == NULL)
1368 		return -ENOENT;
1369 
1370 	min_spi = 0x100;
1371 	max_spi = 0x0fffffff;
1372 
1373 	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1374 	if (range) {
1375 		min_spi = range->sadb_spirange_min;
1376 		max_spi = range->sadb_spirange_max;
1377 	}
1378 
1379 	err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
1380 	if (err) {
1381 		xfrm_state_put(x);
1382 		return err;
1383 	}
1384 
1385 	err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
1386 	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1387 
1388 	if (IS_ERR(resp_skb)) {
1389 		xfrm_state_put(x);
1390 		return  PTR_ERR(resp_skb);
1391 	}
1392 
1393 	out_hdr = (struct sadb_msg *) resp_skb->data;
1394 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1395 	out_hdr->sadb_msg_type = SADB_GETSPI;
1396 	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1397 	out_hdr->sadb_msg_errno = 0;
1398 	out_hdr->sadb_msg_reserved = 0;
1399 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1400 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1401 
1402 	xfrm_state_put(x);
1403 
1404 	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1405 
1406 	return 0;
1407 }
1408 
pfkey_acquire(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1409 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1410 {
1411 	struct net *net = sock_net(sk);
1412 	struct xfrm_state *x;
1413 
1414 	if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1415 		return -EOPNOTSUPP;
1416 
1417 	if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1418 		return 0;
1419 
1420 	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1421 	if (x == NULL)
1422 		return 0;
1423 
1424 	spin_lock_bh(&x->lock);
1425 	if (x->km.state == XFRM_STATE_ACQ)
1426 		x->km.state = XFRM_STATE_ERROR;
1427 
1428 	spin_unlock_bh(&x->lock);
1429 	xfrm_state_put(x);
1430 	return 0;
1431 }
1432 
event2poltype(int event)1433 static inline int event2poltype(int event)
1434 {
1435 	switch (event) {
1436 	case XFRM_MSG_DELPOLICY:
1437 		return SADB_X_SPDDELETE;
1438 	case XFRM_MSG_NEWPOLICY:
1439 		return SADB_X_SPDADD;
1440 	case XFRM_MSG_UPDPOLICY:
1441 		return SADB_X_SPDUPDATE;
1442 	case XFRM_MSG_POLEXPIRE:
1443 	//	return SADB_X_SPDEXPIRE;
1444 	default:
1445 		pr_err("pfkey: Unknown policy event %d\n", event);
1446 		break;
1447 	}
1448 
1449 	return 0;
1450 }
1451 
event2keytype(int event)1452 static inline int event2keytype(int event)
1453 {
1454 	switch (event) {
1455 	case XFRM_MSG_DELSA:
1456 		return SADB_DELETE;
1457 	case XFRM_MSG_NEWSA:
1458 		return SADB_ADD;
1459 	case XFRM_MSG_UPDSA:
1460 		return SADB_UPDATE;
1461 	case XFRM_MSG_EXPIRE:
1462 		return SADB_EXPIRE;
1463 	default:
1464 		pr_err("pfkey: Unknown SA event %d\n", event);
1465 		break;
1466 	}
1467 
1468 	return 0;
1469 }
1470 
1471 /* ADD/UPD/DEL */
key_notify_sa(struct xfrm_state * x,const struct km_event * c)1472 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1473 {
1474 	struct sk_buff *skb;
1475 	struct sadb_msg *hdr;
1476 
1477 	skb = pfkey_xfrm_state2msg(x);
1478 
1479 	if (IS_ERR(skb))
1480 		return PTR_ERR(skb);
1481 
1482 	hdr = (struct sadb_msg *) skb->data;
1483 	hdr->sadb_msg_version = PF_KEY_V2;
1484 	hdr->sadb_msg_type = event2keytype(c->event);
1485 	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1486 	hdr->sadb_msg_errno = 0;
1487 	hdr->sadb_msg_reserved = 0;
1488 	hdr->sadb_msg_seq = c->seq;
1489 	hdr->sadb_msg_pid = c->portid;
1490 
1491 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1492 
1493 	return 0;
1494 }
1495 
pfkey_add(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1496 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498 	struct net *net = sock_net(sk);
1499 	struct xfrm_state *x;
1500 	int err;
1501 	struct km_event c;
1502 
1503 	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1504 	if (IS_ERR(x))
1505 		return PTR_ERR(x);
1506 
1507 	xfrm_state_hold(x);
1508 	if (hdr->sadb_msg_type == SADB_ADD)
1509 		err = xfrm_state_add(x);
1510 	else
1511 		err = xfrm_state_update(x);
1512 
1513 	xfrm_audit_state_add(x, err ? 0 : 1, true);
1514 
1515 	if (err < 0) {
1516 		x->km.state = XFRM_STATE_DEAD;
1517 		__xfrm_state_put(x);
1518 		goto out;
1519 	}
1520 
1521 	if (hdr->sadb_msg_type == SADB_ADD)
1522 		c.event = XFRM_MSG_NEWSA;
1523 	else
1524 		c.event = XFRM_MSG_UPDSA;
1525 	c.seq = hdr->sadb_msg_seq;
1526 	c.portid = hdr->sadb_msg_pid;
1527 	km_state_notify(x, &c);
1528 out:
1529 	xfrm_state_put(x);
1530 	return err;
1531 }
1532 
pfkey_delete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1533 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1534 {
1535 	struct net *net = sock_net(sk);
1536 	struct xfrm_state *x;
1537 	struct km_event c;
1538 	int err;
1539 
1540 	if (!ext_hdrs[SADB_EXT_SA-1] ||
1541 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1542 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1543 		return -EINVAL;
1544 
1545 	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1546 	if (x == NULL)
1547 		return -ESRCH;
1548 
1549 	if ((err = security_xfrm_state_delete(x)))
1550 		goto out;
1551 
1552 	if (xfrm_state_kern(x)) {
1553 		err = -EPERM;
1554 		goto out;
1555 	}
1556 
1557 	err = xfrm_state_delete(x);
1558 
1559 	if (err < 0)
1560 		goto out;
1561 
1562 	c.seq = hdr->sadb_msg_seq;
1563 	c.portid = hdr->sadb_msg_pid;
1564 	c.event = XFRM_MSG_DELSA;
1565 	km_state_notify(x, &c);
1566 out:
1567 	xfrm_audit_state_delete(x, err ? 0 : 1, true);
1568 	xfrm_state_put(x);
1569 
1570 	return err;
1571 }
1572 
pfkey_get(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1573 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1574 {
1575 	struct net *net = sock_net(sk);
1576 	__u8 proto;
1577 	struct sk_buff *out_skb;
1578 	struct sadb_msg *out_hdr;
1579 	struct xfrm_state *x;
1580 
1581 	if (!ext_hdrs[SADB_EXT_SA-1] ||
1582 	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1583 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1584 		return -EINVAL;
1585 
1586 	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1587 	if (x == NULL)
1588 		return -ESRCH;
1589 
1590 	out_skb = pfkey_xfrm_state2msg(x);
1591 	proto = x->id.proto;
1592 	xfrm_state_put(x);
1593 	if (IS_ERR(out_skb))
1594 		return  PTR_ERR(out_skb);
1595 
1596 	out_hdr = (struct sadb_msg *) out_skb->data;
1597 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1598 	out_hdr->sadb_msg_type = SADB_GET;
1599 	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1600 	out_hdr->sadb_msg_errno = 0;
1601 	out_hdr->sadb_msg_reserved = 0;
1602 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1603 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1604 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1605 
1606 	return 0;
1607 }
1608 
compose_sadb_supported(const struct sadb_msg * orig,gfp_t allocation)1609 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1610 					      gfp_t allocation)
1611 {
1612 	struct sk_buff *skb;
1613 	struct sadb_msg *hdr;
1614 	int len, auth_len, enc_len, i;
1615 
1616 	auth_len = xfrm_count_pfkey_auth_supported();
1617 	if (auth_len) {
1618 		auth_len *= sizeof(struct sadb_alg);
1619 		auth_len += sizeof(struct sadb_supported);
1620 	}
1621 
1622 	enc_len = xfrm_count_pfkey_enc_supported();
1623 	if (enc_len) {
1624 		enc_len *= sizeof(struct sadb_alg);
1625 		enc_len += sizeof(struct sadb_supported);
1626 	}
1627 
1628 	len = enc_len + auth_len + sizeof(struct sadb_msg);
1629 
1630 	skb = alloc_skb(len + 16, allocation);
1631 	if (!skb)
1632 		goto out_put_algs;
1633 
1634 	hdr = skb_put(skb, sizeof(*hdr));
1635 	pfkey_hdr_dup(hdr, orig);
1636 	hdr->sadb_msg_errno = 0;
1637 	hdr->sadb_msg_len = len / sizeof(uint64_t);
1638 
1639 	if (auth_len) {
1640 		struct sadb_supported *sp;
1641 		struct sadb_alg *ap;
1642 
1643 		sp = skb_put(skb, auth_len);
1644 		ap = (struct sadb_alg *) (sp + 1);
1645 
1646 		sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1647 		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1648 
1649 		for (i = 0; ; i++) {
1650 			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1651 			if (!aalg)
1652 				break;
1653 			if (!aalg->pfkey_supported)
1654 				continue;
1655 			if (aalg->available)
1656 				*ap++ = aalg->desc;
1657 		}
1658 	}
1659 
1660 	if (enc_len) {
1661 		struct sadb_supported *sp;
1662 		struct sadb_alg *ap;
1663 
1664 		sp = skb_put(skb, enc_len);
1665 		ap = (struct sadb_alg *) (sp + 1);
1666 
1667 		sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1668 		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1669 
1670 		for (i = 0; ; i++) {
1671 			struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1672 			if (!ealg)
1673 				break;
1674 			if (!ealg->pfkey_supported)
1675 				continue;
1676 			if (ealg->available)
1677 				*ap++ = ealg->desc;
1678 		}
1679 	}
1680 
1681 out_put_algs:
1682 	return skb;
1683 }
1684 
pfkey_register(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1685 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1686 {
1687 	struct pfkey_sock *pfk = pfkey_sk(sk);
1688 	struct sk_buff *supp_skb;
1689 
1690 	if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1691 		return -EINVAL;
1692 
1693 	if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1694 		if (pfk->registered&(1<<hdr->sadb_msg_satype))
1695 			return -EEXIST;
1696 		pfk->registered |= (1<<hdr->sadb_msg_satype);
1697 	}
1698 
1699 	mutex_lock(&pfkey_mutex);
1700 	xfrm_probe_algs();
1701 
1702 	supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1703 	mutex_unlock(&pfkey_mutex);
1704 
1705 	if (!supp_skb) {
1706 		if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1707 			pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1708 
1709 		return -ENOBUFS;
1710 	}
1711 
1712 	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1713 			sock_net(sk));
1714 	return 0;
1715 }
1716 
unicast_flush_resp(struct sock * sk,const struct sadb_msg * ihdr)1717 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1718 {
1719 	struct sk_buff *skb;
1720 	struct sadb_msg *hdr;
1721 
1722 	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1723 	if (!skb)
1724 		return -ENOBUFS;
1725 
1726 	hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1727 	hdr->sadb_msg_errno = (uint8_t) 0;
1728 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1729 
1730 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1731 			       sock_net(sk));
1732 }
1733 
key_notify_sa_flush(const struct km_event * c)1734 static int key_notify_sa_flush(const struct km_event *c)
1735 {
1736 	struct sk_buff *skb;
1737 	struct sadb_msg *hdr;
1738 
1739 	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1740 	if (!skb)
1741 		return -ENOBUFS;
1742 	hdr = skb_put(skb, sizeof(struct sadb_msg));
1743 	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1744 	hdr->sadb_msg_type = SADB_FLUSH;
1745 	hdr->sadb_msg_seq = c->seq;
1746 	hdr->sadb_msg_pid = c->portid;
1747 	hdr->sadb_msg_version = PF_KEY_V2;
1748 	hdr->sadb_msg_errno = (uint8_t) 0;
1749 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1750 	hdr->sadb_msg_reserved = 0;
1751 
1752 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1753 
1754 	return 0;
1755 }
1756 
pfkey_flush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1757 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1758 {
1759 	struct net *net = sock_net(sk);
1760 	unsigned int proto;
1761 	struct km_event c;
1762 	int err, err2;
1763 
1764 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1765 	if (proto == 0)
1766 		return -EINVAL;
1767 
1768 	err = xfrm_state_flush(net, proto, true, false);
1769 	err2 = unicast_flush_resp(sk, hdr);
1770 	if (err || err2) {
1771 		if (err == -ESRCH) /* empty table - go quietly */
1772 			err = 0;
1773 		return err ? err : err2;
1774 	}
1775 
1776 	c.data.proto = proto;
1777 	c.seq = hdr->sadb_msg_seq;
1778 	c.portid = hdr->sadb_msg_pid;
1779 	c.event = XFRM_MSG_FLUSHSA;
1780 	c.net = net;
1781 	km_state_notify(NULL, &c);
1782 
1783 	return 0;
1784 }
1785 
dump_sa(struct xfrm_state * x,int count,void * ptr)1786 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1787 {
1788 	struct pfkey_sock *pfk = ptr;
1789 	struct sk_buff *out_skb;
1790 	struct sadb_msg *out_hdr;
1791 
1792 	if (!pfkey_can_dump(&pfk->sk))
1793 		return -ENOBUFS;
1794 
1795 	out_skb = pfkey_xfrm_state2msg(x);
1796 	if (IS_ERR(out_skb))
1797 		return PTR_ERR(out_skb);
1798 
1799 	out_hdr = (struct sadb_msg *) out_skb->data;
1800 	out_hdr->sadb_msg_version = pfk->dump.msg_version;
1801 	out_hdr->sadb_msg_type = SADB_DUMP;
1802 	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1803 	out_hdr->sadb_msg_errno = 0;
1804 	out_hdr->sadb_msg_reserved = 0;
1805 	out_hdr->sadb_msg_seq = count + 1;
1806 	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1807 
1808 	if (pfk->dump.skb)
1809 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1810 				&pfk->sk, sock_net(&pfk->sk));
1811 	pfk->dump.skb = out_skb;
1812 
1813 	return 0;
1814 }
1815 
pfkey_dump_sa(struct pfkey_sock * pfk)1816 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1817 {
1818 	struct net *net = sock_net(&pfk->sk);
1819 	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1820 }
1821 
pfkey_dump_sa_done(struct pfkey_sock * pfk)1822 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1823 {
1824 	struct net *net = sock_net(&pfk->sk);
1825 
1826 	xfrm_state_walk_done(&pfk->dump.u.state, net);
1827 }
1828 
pfkey_dump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1829 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1830 {
1831 	u8 proto;
1832 	struct xfrm_address_filter *filter = NULL;
1833 	struct pfkey_sock *pfk = pfkey_sk(sk);
1834 
1835 	mutex_lock(&pfk->dump_lock);
1836 	if (pfk->dump.dump != NULL) {
1837 		mutex_unlock(&pfk->dump_lock);
1838 		return -EBUSY;
1839 	}
1840 
1841 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1842 	if (proto == 0) {
1843 		mutex_unlock(&pfk->dump_lock);
1844 		return -EINVAL;
1845 	}
1846 
1847 	if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1848 		struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1849 
1850 		if ((xfilter->sadb_x_filter_splen >
1851 			(sizeof(xfrm_address_t) << 3)) ||
1852 		    (xfilter->sadb_x_filter_dplen >
1853 			(sizeof(xfrm_address_t) << 3))) {
1854 			mutex_unlock(&pfk->dump_lock);
1855 			return -EINVAL;
1856 		}
1857 		filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1858 		if (filter == NULL) {
1859 			mutex_unlock(&pfk->dump_lock);
1860 			return -ENOMEM;
1861 		}
1862 
1863 		memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1864 		       sizeof(xfrm_address_t));
1865 		memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1866 		       sizeof(xfrm_address_t));
1867 		filter->family = xfilter->sadb_x_filter_family;
1868 		filter->splen = xfilter->sadb_x_filter_splen;
1869 		filter->dplen = xfilter->sadb_x_filter_dplen;
1870 	}
1871 
1872 	pfk->dump.msg_version = hdr->sadb_msg_version;
1873 	pfk->dump.msg_portid = hdr->sadb_msg_pid;
1874 	pfk->dump.dump = pfkey_dump_sa;
1875 	pfk->dump.done = pfkey_dump_sa_done;
1876 	xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1877 	mutex_unlock(&pfk->dump_lock);
1878 
1879 	return pfkey_do_dump(pfk);
1880 }
1881 
pfkey_promisc(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1882 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1883 {
1884 	struct pfkey_sock *pfk = pfkey_sk(sk);
1885 	int satype = hdr->sadb_msg_satype;
1886 	bool reset_errno = false;
1887 
1888 	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1889 		reset_errno = true;
1890 		if (satype != 0 && satype != 1)
1891 			return -EINVAL;
1892 		pfk->promisc = satype;
1893 	}
1894 	if (reset_errno && skb_cloned(skb))
1895 		skb = skb_copy(skb, GFP_KERNEL);
1896 	else
1897 		skb = skb_clone(skb, GFP_KERNEL);
1898 
1899 	if (reset_errno && skb) {
1900 		struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1901 		new_hdr->sadb_msg_errno = 0;
1902 	}
1903 
1904 	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1905 	return 0;
1906 }
1907 
check_reqid(struct xfrm_policy * xp,int dir,int count,void * ptr)1908 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1909 {
1910 	int i;
1911 	u32 reqid = *(u32*)ptr;
1912 
1913 	for (i=0; i<xp->xfrm_nr; i++) {
1914 		if (xp->xfrm_vec[i].reqid == reqid)
1915 			return -EEXIST;
1916 	}
1917 	return 0;
1918 }
1919 
gen_reqid(struct net * net)1920 static u32 gen_reqid(struct net *net)
1921 {
1922 	struct xfrm_policy_walk walk;
1923 	u32 start;
1924 	int rc;
1925 	static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1926 
1927 	start = reqid;
1928 	do {
1929 		++reqid;
1930 		if (reqid == 0)
1931 			reqid = IPSEC_MANUAL_REQID_MAX+1;
1932 		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1933 		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1934 		xfrm_policy_walk_done(&walk, net);
1935 		if (rc != -EEXIST)
1936 			return reqid;
1937 	} while (reqid != start);
1938 	return 0;
1939 }
1940 
1941 static int
parse_ipsecrequest(struct xfrm_policy * xp,struct sadb_x_policy * pol,struct sadb_x_ipsecrequest * rq)1942 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol,
1943 		   struct sadb_x_ipsecrequest *rq)
1944 {
1945 	struct net *net = xp_net(xp);
1946 	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947 	int mode;
1948 
1949 	if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950 		return -ELOOP;
1951 
1952 	if (rq->sadb_x_ipsecrequest_mode == 0)
1953 		return -EINVAL;
1954 	if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955 		return -EINVAL;
1956 
1957 	t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958 	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959 		return -EINVAL;
1960 	t->mode = mode;
1961 	if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) {
1962 		if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) &&
1963 		    pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND)
1964 			return -EINVAL;
1965 		t->optional = 1;
1966 	} else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1967 		t->reqid = rq->sadb_x_ipsecrequest_reqid;
1968 		if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1969 			t->reqid = 0;
1970 		if (!t->reqid && !(t->reqid = gen_reqid(net)))
1971 			return -ENOBUFS;
1972 	}
1973 
1974 	/* addresses present only in tunnel mode */
1975 	if (t->mode == XFRM_MODE_TUNNEL) {
1976 		int err;
1977 
1978 		err = parse_sockaddr_pair(
1979 			(struct sockaddr *)(rq + 1),
1980 			rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1981 			&t->saddr, &t->id.daddr, &t->encap_family);
1982 		if (err)
1983 			return err;
1984 	} else
1985 		t->encap_family = xp->family;
1986 
1987 	/* No way to set this via kame pfkey */
1988 	t->allalgs = 1;
1989 	xp->xfrm_nr++;
1990 	return 0;
1991 }
1992 
1993 static int
parse_ipsecrequests(struct xfrm_policy * xp,struct sadb_x_policy * pol)1994 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1995 {
1996 	int err;
1997 	int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1998 	struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1999 
2000 	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2001 		return -EINVAL;
2002 
2003 	while (len >= sizeof(*rq)) {
2004 		if (len < rq->sadb_x_ipsecrequest_len ||
2005 		    rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2006 			return -EINVAL;
2007 
2008 		if ((err = parse_ipsecrequest(xp, pol, rq)) < 0)
2009 			return err;
2010 		len -= rq->sadb_x_ipsecrequest_len;
2011 		rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2012 	}
2013 	return 0;
2014 }
2015 
pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy * xp)2016 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2017 {
2018 	struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2019 
2020 	if (xfrm_ctx) {
2021 		int len = sizeof(struct sadb_x_sec_ctx);
2022 		len += xfrm_ctx->ctx_len;
2023 		return PFKEY_ALIGN8(len);
2024 	}
2025 	return 0;
2026 }
2027 
pfkey_xfrm_policy2msg_size(const struct xfrm_policy * xp)2028 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2029 {
2030 	const struct xfrm_tmpl *t;
2031 	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2032 	int socklen = 0;
2033 	int i;
2034 
2035 	for (i=0; i<xp->xfrm_nr; i++) {
2036 		t = xp->xfrm_vec + i;
2037 		socklen += pfkey_sockaddr_len(t->encap_family);
2038 	}
2039 
2040 	return sizeof(struct sadb_msg) +
2041 		(sizeof(struct sadb_lifetime) * 3) +
2042 		(sizeof(struct sadb_address) * 2) +
2043 		(sockaddr_size * 2) +
2044 		sizeof(struct sadb_x_policy) +
2045 		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2046 		(socklen * 2) +
2047 		pfkey_xfrm_policy2sec_ctx_size(xp);
2048 }
2049 
pfkey_xfrm_policy2msg_prep(const struct xfrm_policy * xp)2050 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2051 {
2052 	struct sk_buff *skb;
2053 	int size;
2054 
2055 	size = pfkey_xfrm_policy2msg_size(xp);
2056 
2057 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
2058 	if (skb == NULL)
2059 		return ERR_PTR(-ENOBUFS);
2060 
2061 	return skb;
2062 }
2063 
pfkey_xfrm_policy2msg(struct sk_buff * skb,const struct xfrm_policy * xp,int dir)2064 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2065 {
2066 	struct sadb_msg *hdr;
2067 	struct sadb_address *addr;
2068 	struct sadb_lifetime *lifetime;
2069 	struct sadb_x_policy *pol;
2070 	struct sadb_x_sec_ctx *sec_ctx;
2071 	struct xfrm_sec_ctx *xfrm_ctx;
2072 	int i;
2073 	int size;
2074 	int sockaddr_size = pfkey_sockaddr_size(xp->family);
2075 	int socklen = pfkey_sockaddr_len(xp->family);
2076 
2077 	size = pfkey_xfrm_policy2msg_size(xp);
2078 
2079 	/* call should fill header later */
2080 	hdr = skb_put(skb, sizeof(struct sadb_msg));
2081 	memset(hdr, 0, size);	/* XXX do we need this ? */
2082 
2083 	/* src address */
2084 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2085 	addr->sadb_address_len =
2086 		(sizeof(struct sadb_address)+sockaddr_size)/
2087 			sizeof(uint64_t);
2088 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2089 	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2090 	addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2091 	addr->sadb_address_reserved = 0;
2092 	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2093 				 xp->selector.sport,
2094 				 (struct sockaddr *) (addr + 1),
2095 				 xp->family))
2096 		BUG();
2097 
2098 	/* dst address */
2099 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2100 	addr->sadb_address_len =
2101 		(sizeof(struct sadb_address)+sockaddr_size)/
2102 			sizeof(uint64_t);
2103 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2104 	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2105 	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2106 	addr->sadb_address_reserved = 0;
2107 
2108 	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2109 			    (struct sockaddr *) (addr + 1),
2110 			    xp->family);
2111 
2112 	/* hard time */
2113 	lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2114 	lifetime->sadb_lifetime_len =
2115 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2116 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2117 	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2118 	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2119 	lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2120 	lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2121 	/* soft time */
2122 	lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2123 	lifetime->sadb_lifetime_len =
2124 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2125 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2126 	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2127 	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2128 	lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2129 	lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2130 	/* current time */
2131 	lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2132 	lifetime->sadb_lifetime_len =
2133 		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2134 	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2135 	lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2136 	lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2137 	lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2138 	lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2139 
2140 	pol = skb_put(skb, sizeof(struct sadb_x_policy));
2141 	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2142 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2143 	pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2144 	if (xp->action == XFRM_POLICY_ALLOW) {
2145 		if (xp->xfrm_nr)
2146 			pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2147 		else
2148 			pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2149 	}
2150 	pol->sadb_x_policy_dir = dir+1;
2151 	pol->sadb_x_policy_reserved = 0;
2152 	pol->sadb_x_policy_id = xp->index;
2153 	pol->sadb_x_policy_priority = xp->priority;
2154 
2155 	for (i=0; i<xp->xfrm_nr; i++) {
2156 		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2157 		struct sadb_x_ipsecrequest *rq;
2158 		int req_size;
2159 		int mode;
2160 
2161 		req_size = sizeof(struct sadb_x_ipsecrequest);
2162 		if (t->mode == XFRM_MODE_TUNNEL) {
2163 			socklen = pfkey_sockaddr_len(t->encap_family);
2164 			req_size += socklen * 2;
2165 		} else {
2166 			size -= 2*socklen;
2167 		}
2168 		rq = skb_put(skb, req_size);
2169 		pol->sadb_x_policy_len += req_size/8;
2170 		memset(rq, 0, sizeof(*rq));
2171 		rq->sadb_x_ipsecrequest_len = req_size;
2172 		rq->sadb_x_ipsecrequest_proto = t->id.proto;
2173 		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2174 			return -EINVAL;
2175 		rq->sadb_x_ipsecrequest_mode = mode;
2176 		rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2177 		if (t->reqid)
2178 			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2179 		if (t->optional)
2180 			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2181 		rq->sadb_x_ipsecrequest_reqid = t->reqid;
2182 
2183 		if (t->mode == XFRM_MODE_TUNNEL) {
2184 			u8 *sa = (void *)(rq + 1);
2185 			pfkey_sockaddr_fill(&t->saddr, 0,
2186 					    (struct sockaddr *)sa,
2187 					    t->encap_family);
2188 			pfkey_sockaddr_fill(&t->id.daddr, 0,
2189 					    (struct sockaddr *) (sa + socklen),
2190 					    t->encap_family);
2191 		}
2192 	}
2193 
2194 	/* security context */
2195 	if ((xfrm_ctx = xp->security)) {
2196 		int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2197 
2198 		sec_ctx = skb_put(skb, ctx_size);
2199 		sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2200 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2201 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2202 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2203 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2204 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2205 		       xfrm_ctx->ctx_len);
2206 	}
2207 
2208 	hdr->sadb_msg_len = size / sizeof(uint64_t);
2209 	hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2210 
2211 	return 0;
2212 }
2213 
key_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)2214 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2215 {
2216 	struct sk_buff *out_skb;
2217 	struct sadb_msg *out_hdr;
2218 	int err;
2219 
2220 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2221 	if (IS_ERR(out_skb))
2222 		return PTR_ERR(out_skb);
2223 
2224 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2225 	if (err < 0) {
2226 		kfree_skb(out_skb);
2227 		return err;
2228 	}
2229 
2230 	out_hdr = (struct sadb_msg *) out_skb->data;
2231 	out_hdr->sadb_msg_version = PF_KEY_V2;
2232 
2233 	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2234 		out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2235 	else
2236 		out_hdr->sadb_msg_type = event2poltype(c->event);
2237 	out_hdr->sadb_msg_errno = 0;
2238 	out_hdr->sadb_msg_seq = c->seq;
2239 	out_hdr->sadb_msg_pid = c->portid;
2240 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2241 	return 0;
2242 
2243 }
2244 
pfkey_spdadd(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2245 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2246 {
2247 	struct net *net = sock_net(sk);
2248 	int err = 0;
2249 	struct sadb_lifetime *lifetime;
2250 	struct sadb_address *sa;
2251 	struct sadb_x_policy *pol;
2252 	struct xfrm_policy *xp;
2253 	struct km_event c;
2254 	struct sadb_x_sec_ctx *sec_ctx;
2255 
2256 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2257 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2258 	    !ext_hdrs[SADB_X_EXT_POLICY-1])
2259 		return -EINVAL;
2260 
2261 	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2262 	if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2263 		return -EINVAL;
2264 	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2265 		return -EINVAL;
2266 
2267 	xp = xfrm_policy_alloc(net, GFP_KERNEL);
2268 	if (xp == NULL)
2269 		return -ENOBUFS;
2270 
2271 	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2272 		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2273 	xp->priority = pol->sadb_x_policy_priority;
2274 
2275 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2276 	xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2277 	xp->selector.family = xp->family;
2278 	xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2279 	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2280 	xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2281 	if (xp->selector.sport)
2282 		xp->selector.sport_mask = htons(0xffff);
2283 
2284 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2285 	pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2286 	xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2287 
2288 	/* Amusing, we set this twice.  KAME apps appear to set same value
2289 	 * in both addresses.
2290 	 */
2291 	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2292 
2293 	xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2294 	if (xp->selector.dport)
2295 		xp->selector.dport_mask = htons(0xffff);
2296 
2297 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2298 	if (sec_ctx != NULL) {
2299 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2300 
2301 		if (!uctx) {
2302 			err = -ENOBUFS;
2303 			goto out;
2304 		}
2305 
2306 		err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2307 		kfree(uctx);
2308 
2309 		if (err)
2310 			goto out;
2311 	}
2312 
2313 	xp->lft.soft_byte_limit = XFRM_INF;
2314 	xp->lft.hard_byte_limit = XFRM_INF;
2315 	xp->lft.soft_packet_limit = XFRM_INF;
2316 	xp->lft.hard_packet_limit = XFRM_INF;
2317 	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2318 		xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2319 		xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2320 		xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2321 		xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2322 	}
2323 	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2324 		xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2325 		xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2326 		xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2327 		xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2328 	}
2329 	xp->xfrm_nr = 0;
2330 	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2331 	    (err = parse_ipsecrequests(xp, pol)) < 0)
2332 		goto out;
2333 
2334 	err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2335 				 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2336 
2337 	xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2338 
2339 	if (err)
2340 		goto out;
2341 
2342 	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2343 		c.event = XFRM_MSG_UPDPOLICY;
2344 	else
2345 		c.event = XFRM_MSG_NEWPOLICY;
2346 
2347 	c.seq = hdr->sadb_msg_seq;
2348 	c.portid = hdr->sadb_msg_pid;
2349 
2350 	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2351 	xfrm_pol_put(xp);
2352 	return 0;
2353 
2354 out:
2355 	xp->walk.dead = 1;
2356 	xfrm_policy_destroy(xp);
2357 	return err;
2358 }
2359 
pfkey_spddelete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2360 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2361 {
2362 	struct net *net = sock_net(sk);
2363 	int err;
2364 	struct sadb_address *sa;
2365 	struct sadb_x_policy *pol;
2366 	struct xfrm_policy *xp;
2367 	struct xfrm_selector sel;
2368 	struct km_event c;
2369 	struct sadb_x_sec_ctx *sec_ctx;
2370 	struct xfrm_sec_ctx *pol_ctx = NULL;
2371 
2372 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2373 				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2374 	    !ext_hdrs[SADB_X_EXT_POLICY-1])
2375 		return -EINVAL;
2376 
2377 	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2378 	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2379 		return -EINVAL;
2380 
2381 	memset(&sel, 0, sizeof(sel));
2382 
2383 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2384 	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2385 	sel.prefixlen_s = sa->sadb_address_prefixlen;
2386 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2387 	sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2388 	if (sel.sport)
2389 		sel.sport_mask = htons(0xffff);
2390 
2391 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2392 	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2393 	sel.prefixlen_d = sa->sadb_address_prefixlen;
2394 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2395 	sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2396 	if (sel.dport)
2397 		sel.dport_mask = htons(0xffff);
2398 
2399 	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2400 	if (sec_ctx != NULL) {
2401 		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2402 
2403 		if (!uctx)
2404 			return -ENOMEM;
2405 
2406 		err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2407 		kfree(uctx);
2408 		if (err)
2409 			return err;
2410 	}
2411 
2412 	xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2413 				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2414 				   1, &err);
2415 	security_xfrm_policy_free(pol_ctx);
2416 	if (xp == NULL)
2417 		return -ENOENT;
2418 
2419 	xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2420 
2421 	if (err)
2422 		goto out;
2423 
2424 	c.seq = hdr->sadb_msg_seq;
2425 	c.portid = hdr->sadb_msg_pid;
2426 	c.data.byid = 0;
2427 	c.event = XFRM_MSG_DELPOLICY;
2428 	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2429 
2430 out:
2431 	xfrm_pol_put(xp);
2432 	return err;
2433 }
2434 
key_pol_get_resp(struct sock * sk,struct xfrm_policy * xp,const struct sadb_msg * hdr,int dir)2435 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2436 {
2437 	int err;
2438 	struct sk_buff *out_skb;
2439 	struct sadb_msg *out_hdr;
2440 	err = 0;
2441 
2442 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2443 	if (IS_ERR(out_skb)) {
2444 		err =  PTR_ERR(out_skb);
2445 		goto out;
2446 	}
2447 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2448 	if (err < 0) {
2449 		kfree_skb(out_skb);
2450 		goto out;
2451 	}
2452 
2453 	out_hdr = (struct sadb_msg *) out_skb->data;
2454 	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2455 	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2456 	out_hdr->sadb_msg_satype = 0;
2457 	out_hdr->sadb_msg_errno = 0;
2458 	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2459 	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2460 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2461 	err = 0;
2462 
2463 out:
2464 	return err;
2465 }
2466 
pfkey_sockaddr_pair_size(sa_family_t family)2467 static int pfkey_sockaddr_pair_size(sa_family_t family)
2468 {
2469 	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2470 }
2471 
parse_sockaddr_pair(struct sockaddr * sa,int ext_len,xfrm_address_t * saddr,xfrm_address_t * daddr,u16 * family)2472 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2473 			       xfrm_address_t *saddr, xfrm_address_t *daddr,
2474 			       u16 *family)
2475 {
2476 	int af, socklen;
2477 
2478 	if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2479 		return -EINVAL;
2480 
2481 	af = pfkey_sockaddr_extract(sa, saddr);
2482 	if (!af)
2483 		return -EINVAL;
2484 
2485 	socklen = pfkey_sockaddr_len(af);
2486 	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2487 				   daddr) != af)
2488 		return -EINVAL;
2489 
2490 	*family = af;
2491 	return 0;
2492 }
2493 
2494 #ifdef CONFIG_NET_KEY_MIGRATE
ipsecrequests_to_migrate(struct sadb_x_ipsecrequest * rq1,int len,struct xfrm_migrate * m)2495 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2496 				    struct xfrm_migrate *m)
2497 {
2498 	int err;
2499 	struct sadb_x_ipsecrequest *rq2;
2500 	int mode;
2501 
2502 	if (len < sizeof(*rq1) ||
2503 	    len < rq1->sadb_x_ipsecrequest_len ||
2504 	    rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2505 		return -EINVAL;
2506 
2507 	/* old endoints */
2508 	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2509 				  rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2510 				  &m->old_saddr, &m->old_daddr,
2511 				  &m->old_family);
2512 	if (err)
2513 		return err;
2514 
2515 	rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2516 	len -= rq1->sadb_x_ipsecrequest_len;
2517 
2518 	if (len <= sizeof(*rq2) ||
2519 	    len < rq2->sadb_x_ipsecrequest_len ||
2520 	    rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2521 		return -EINVAL;
2522 
2523 	/* new endpoints */
2524 	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2525 				  rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2526 				  &m->new_saddr, &m->new_daddr,
2527 				  &m->new_family);
2528 	if (err)
2529 		return err;
2530 
2531 	if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2532 	    rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2533 	    rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2534 		return -EINVAL;
2535 
2536 	m->proto = rq1->sadb_x_ipsecrequest_proto;
2537 	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2538 		return -EINVAL;
2539 	m->mode = mode;
2540 	m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2541 
2542 	return ((int)(rq1->sadb_x_ipsecrequest_len +
2543 		      rq2->sadb_x_ipsecrequest_len));
2544 }
2545 
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2546 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2547 			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2548 {
2549 	int i, len, ret, err = -EINVAL;
2550 	u8 dir;
2551 	struct sadb_address *sa;
2552 	struct sadb_x_kmaddress *kma;
2553 	struct sadb_x_policy *pol;
2554 	struct sadb_x_ipsecrequest *rq;
2555 	struct xfrm_selector sel;
2556 	struct xfrm_migrate m[XFRM_MAX_DEPTH];
2557 	struct xfrm_kmaddress k;
2558 	struct net *net = sock_net(sk);
2559 
2560 	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2561 				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2562 	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2563 		err = -EINVAL;
2564 		goto out;
2565 	}
2566 
2567 	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2568 	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2569 
2570 	if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2571 		err = -EINVAL;
2572 		goto out;
2573 	}
2574 
2575 	if (kma) {
2576 		/* convert sadb_x_kmaddress to xfrm_kmaddress */
2577 		k.reserved = kma->sadb_x_kmaddress_reserved;
2578 		ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2579 					  8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2580 					  &k.local, &k.remote, &k.family);
2581 		if (ret < 0) {
2582 			err = ret;
2583 			goto out;
2584 		}
2585 	}
2586 
2587 	dir = pol->sadb_x_policy_dir - 1;
2588 	memset(&sel, 0, sizeof(sel));
2589 
2590 	/* set source address info of selector */
2591 	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2592 	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2593 	sel.prefixlen_s = sa->sadb_address_prefixlen;
2594 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2595 	sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2596 	if (sel.sport)
2597 		sel.sport_mask = htons(0xffff);
2598 
2599 	/* set destination address info of selector */
2600 	sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2601 	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2602 	sel.prefixlen_d = sa->sadb_address_prefixlen;
2603 	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2604 	sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2605 	if (sel.dport)
2606 		sel.dport_mask = htons(0xffff);
2607 
2608 	rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2609 
2610 	/* extract ipsecrequests */
2611 	i = 0;
2612 	len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2613 
2614 	while (len > 0 && i < XFRM_MAX_DEPTH) {
2615 		ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2616 		if (ret < 0) {
2617 			err = ret;
2618 			goto out;
2619 		} else {
2620 			rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2621 			len -= ret;
2622 			i++;
2623 		}
2624 	}
2625 
2626 	if (!i || len > 0) {
2627 		err = -EINVAL;
2628 		goto out;
2629 	}
2630 
2631 	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2632 			    kma ? &k : NULL, net, NULL, 0, NULL);
2633 
2634  out:
2635 	return err;
2636 }
2637 #else
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2638 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2639 			 const struct sadb_msg *hdr, void * const *ext_hdrs)
2640 {
2641 	return -ENOPROTOOPT;
2642 }
2643 #endif
2644 
2645 
pfkey_spdget(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2646 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2647 {
2648 	struct net *net = sock_net(sk);
2649 	unsigned int dir;
2650 	int err = 0, delete;
2651 	struct sadb_x_policy *pol;
2652 	struct xfrm_policy *xp;
2653 	struct km_event c;
2654 
2655 	if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2656 		return -EINVAL;
2657 
2658 	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2659 	if (dir >= XFRM_POLICY_MAX)
2660 		return -EINVAL;
2661 
2662 	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2663 	xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2664 			      dir, pol->sadb_x_policy_id, delete, &err);
2665 	if (xp == NULL)
2666 		return -ENOENT;
2667 
2668 	if (delete) {
2669 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2670 
2671 		if (err)
2672 			goto out;
2673 		c.seq = hdr->sadb_msg_seq;
2674 		c.portid = hdr->sadb_msg_pid;
2675 		c.data.byid = 1;
2676 		c.event = XFRM_MSG_DELPOLICY;
2677 		km_policy_notify(xp, dir, &c);
2678 	} else {
2679 		err = key_pol_get_resp(sk, xp, hdr, dir);
2680 	}
2681 
2682 out:
2683 	xfrm_pol_put(xp);
2684 	return err;
2685 }
2686 
dump_sp(struct xfrm_policy * xp,int dir,int count,void * ptr)2687 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2688 {
2689 	struct pfkey_sock *pfk = ptr;
2690 	struct sk_buff *out_skb;
2691 	struct sadb_msg *out_hdr;
2692 	int err;
2693 
2694 	if (!pfkey_can_dump(&pfk->sk))
2695 		return -ENOBUFS;
2696 
2697 	out_skb = pfkey_xfrm_policy2msg_prep(xp);
2698 	if (IS_ERR(out_skb))
2699 		return PTR_ERR(out_skb);
2700 
2701 	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2702 	if (err < 0) {
2703 		kfree_skb(out_skb);
2704 		return err;
2705 	}
2706 
2707 	out_hdr = (struct sadb_msg *) out_skb->data;
2708 	out_hdr->sadb_msg_version = pfk->dump.msg_version;
2709 	out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2710 	out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711 	out_hdr->sadb_msg_errno = 0;
2712 	out_hdr->sadb_msg_seq = count + 1;
2713 	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2714 
2715 	if (pfk->dump.skb)
2716 		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2717 				&pfk->sk, sock_net(&pfk->sk));
2718 	pfk->dump.skb = out_skb;
2719 
2720 	return 0;
2721 }
2722 
pfkey_dump_sp(struct pfkey_sock * pfk)2723 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2724 {
2725 	struct net *net = sock_net(&pfk->sk);
2726 	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2727 }
2728 
pfkey_dump_sp_done(struct pfkey_sock * pfk)2729 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2730 {
2731 	struct net *net = sock_net((struct sock *)pfk);
2732 
2733 	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2734 }
2735 
pfkey_spddump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2736 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2737 {
2738 	struct pfkey_sock *pfk = pfkey_sk(sk);
2739 
2740 	mutex_lock(&pfk->dump_lock);
2741 	if (pfk->dump.dump != NULL) {
2742 		mutex_unlock(&pfk->dump_lock);
2743 		return -EBUSY;
2744 	}
2745 
2746 	pfk->dump.msg_version = hdr->sadb_msg_version;
2747 	pfk->dump.msg_portid = hdr->sadb_msg_pid;
2748 	pfk->dump.dump = pfkey_dump_sp;
2749 	pfk->dump.done = pfkey_dump_sp_done;
2750 	xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2751 	mutex_unlock(&pfk->dump_lock);
2752 
2753 	return pfkey_do_dump(pfk);
2754 }
2755 
key_notify_policy_flush(const struct km_event * c)2756 static int key_notify_policy_flush(const struct km_event *c)
2757 {
2758 	struct sk_buff *skb_out;
2759 	struct sadb_msg *hdr;
2760 
2761 	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2762 	if (!skb_out)
2763 		return -ENOBUFS;
2764 	hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2765 	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2766 	hdr->sadb_msg_seq = c->seq;
2767 	hdr->sadb_msg_pid = c->portid;
2768 	hdr->sadb_msg_version = PF_KEY_V2;
2769 	hdr->sadb_msg_errno = (uint8_t) 0;
2770 	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2771 	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2772 	hdr->sadb_msg_reserved = 0;
2773 	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2774 	return 0;
2775 
2776 }
2777 
pfkey_spdflush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2778 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2779 {
2780 	struct net *net = sock_net(sk);
2781 	struct km_event c;
2782 	int err, err2;
2783 
2784 	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2785 	err2 = unicast_flush_resp(sk, hdr);
2786 	if (err || err2) {
2787 		if (err == -ESRCH) /* empty table - old silent behavior */
2788 			return 0;
2789 		return err;
2790 	}
2791 
2792 	c.data.type = XFRM_POLICY_TYPE_MAIN;
2793 	c.event = XFRM_MSG_FLUSHPOLICY;
2794 	c.portid = hdr->sadb_msg_pid;
2795 	c.seq = hdr->sadb_msg_seq;
2796 	c.net = net;
2797 	km_policy_notify(NULL, 0, &c);
2798 
2799 	return 0;
2800 }
2801 
2802 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2803 			     const struct sadb_msg *hdr, void * const *ext_hdrs);
2804 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2805 	[SADB_RESERVED]		= pfkey_reserved,
2806 	[SADB_GETSPI]		= pfkey_getspi,
2807 	[SADB_UPDATE]		= pfkey_add,
2808 	[SADB_ADD]		= pfkey_add,
2809 	[SADB_DELETE]		= pfkey_delete,
2810 	[SADB_GET]		= pfkey_get,
2811 	[SADB_ACQUIRE]		= pfkey_acquire,
2812 	[SADB_REGISTER]		= pfkey_register,
2813 	[SADB_EXPIRE]		= NULL,
2814 	[SADB_FLUSH]		= pfkey_flush,
2815 	[SADB_DUMP]		= pfkey_dump,
2816 	[SADB_X_PROMISC]	= pfkey_promisc,
2817 	[SADB_X_PCHANGE]	= NULL,
2818 	[SADB_X_SPDUPDATE]	= pfkey_spdadd,
2819 	[SADB_X_SPDADD]		= pfkey_spdadd,
2820 	[SADB_X_SPDDELETE]	= pfkey_spddelete,
2821 	[SADB_X_SPDGET]		= pfkey_spdget,
2822 	[SADB_X_SPDACQUIRE]	= NULL,
2823 	[SADB_X_SPDDUMP]	= pfkey_spddump,
2824 	[SADB_X_SPDFLUSH]	= pfkey_spdflush,
2825 	[SADB_X_SPDSETIDX]	= pfkey_spdadd,
2826 	[SADB_X_SPDDELETE2]	= pfkey_spdget,
2827 	[SADB_X_MIGRATE]	= pfkey_migrate,
2828 };
2829 
pfkey_process(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr)2830 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2831 {
2832 	void *ext_hdrs[SADB_EXT_MAX];
2833 	int err;
2834 
2835 	/* Non-zero return value of pfkey_broadcast() does not always signal
2836 	 * an error and even on an actual error we may still want to process
2837 	 * the message so rather ignore the return value.
2838 	 */
2839 	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2840 			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2841 
2842 	memset(ext_hdrs, 0, sizeof(ext_hdrs));
2843 	err = parse_exthdrs(skb, hdr, ext_hdrs);
2844 	if (!err) {
2845 		err = -EOPNOTSUPP;
2846 		if (pfkey_funcs[hdr->sadb_msg_type])
2847 			err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2848 	}
2849 	return err;
2850 }
2851 
pfkey_get_base_msg(struct sk_buff * skb,int * errp)2852 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2853 {
2854 	struct sadb_msg *hdr = NULL;
2855 
2856 	if (skb->len < sizeof(*hdr)) {
2857 		*errp = -EMSGSIZE;
2858 	} else {
2859 		hdr = (struct sadb_msg *) skb->data;
2860 		if (hdr->sadb_msg_version != PF_KEY_V2 ||
2861 		    hdr->sadb_msg_reserved != 0 ||
2862 		    (hdr->sadb_msg_type <= SADB_RESERVED ||
2863 		     hdr->sadb_msg_type > SADB_MAX)) {
2864 			hdr = NULL;
2865 			*errp = -EINVAL;
2866 		} else if (hdr->sadb_msg_len != (skb->len /
2867 						 sizeof(uint64_t)) ||
2868 			   hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2869 						sizeof(uint64_t))) {
2870 			hdr = NULL;
2871 			*errp = -EMSGSIZE;
2872 		} else {
2873 			*errp = 0;
2874 		}
2875 	}
2876 	return hdr;
2877 }
2878 
aalg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2879 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2880 				const struct xfrm_algo_desc *d)
2881 {
2882 	unsigned int id = d->desc.sadb_alg_id;
2883 
2884 	if (id >= sizeof(t->aalgos) * 8)
2885 		return 0;
2886 
2887 	return (t->aalgos >> id) & 1;
2888 }
2889 
ealg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2890 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2891 				const struct xfrm_algo_desc *d)
2892 {
2893 	unsigned int id = d->desc.sadb_alg_id;
2894 
2895 	if (id >= sizeof(t->ealgos) * 8)
2896 		return 0;
2897 
2898 	return (t->ealgos >> id) & 1;
2899 }
2900 
count_ah_combs(const struct xfrm_tmpl * t)2901 static int count_ah_combs(const struct xfrm_tmpl *t)
2902 {
2903 	int i, sz = 0;
2904 
2905 	for (i = 0; ; i++) {
2906 		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2907 		if (!aalg)
2908 			break;
2909 		if (!aalg->pfkey_supported)
2910 			continue;
2911 		if (aalg_tmpl_set(t, aalg))
2912 			sz += sizeof(struct sadb_comb);
2913 	}
2914 	return sz + sizeof(struct sadb_prop);
2915 }
2916 
count_esp_combs(const struct xfrm_tmpl * t)2917 static int count_esp_combs(const struct xfrm_tmpl *t)
2918 {
2919 	int i, k, sz = 0;
2920 
2921 	for (i = 0; ; i++) {
2922 		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2923 		if (!ealg)
2924 			break;
2925 
2926 		if (!ealg->pfkey_supported)
2927 			continue;
2928 
2929 		if (!(ealg_tmpl_set(t, ealg)))
2930 			continue;
2931 
2932 		for (k = 1; ; k++) {
2933 			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2934 			if (!aalg)
2935 				break;
2936 
2937 			if (!aalg->pfkey_supported)
2938 				continue;
2939 
2940 			if (aalg_tmpl_set(t, aalg))
2941 				sz += sizeof(struct sadb_comb);
2942 		}
2943 	}
2944 	return sz + sizeof(struct sadb_prop);
2945 }
2946 
dump_ah_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)2947 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2948 {
2949 	struct sadb_prop *p;
2950 	int sz = 0;
2951 	int i;
2952 
2953 	p = skb_put(skb, sizeof(struct sadb_prop));
2954 	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2955 	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2956 	p->sadb_prop_replay = 32;
2957 	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2958 
2959 	for (i = 0; ; i++) {
2960 		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2961 		if (!aalg)
2962 			break;
2963 
2964 		if (!aalg->pfkey_supported)
2965 			continue;
2966 
2967 		if (aalg_tmpl_set(t, aalg) && aalg->available) {
2968 			struct sadb_comb *c;
2969 			c = skb_put_zero(skb, sizeof(struct sadb_comb));
2970 			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2971 			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2972 			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2973 			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2974 			c->sadb_comb_hard_addtime = 24*60*60;
2975 			c->sadb_comb_soft_addtime = 20*60*60;
2976 			c->sadb_comb_hard_usetime = 8*60*60;
2977 			c->sadb_comb_soft_usetime = 7*60*60;
2978 			sz += sizeof(*c);
2979 		}
2980 	}
2981 
2982 	return sz + sizeof(*p);
2983 }
2984 
dump_esp_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)2985 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2986 {
2987 	struct sadb_prop *p;
2988 	int sz = 0;
2989 	int i, k;
2990 
2991 	p = skb_put(skb, sizeof(struct sadb_prop));
2992 	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2993 	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2994 	p->sadb_prop_replay = 32;
2995 	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2996 
2997 	for (i=0; ; i++) {
2998 		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2999 		if (!ealg)
3000 			break;
3001 
3002 		if (!ealg->pfkey_supported)
3003 			continue;
3004 
3005 		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3006 			continue;
3007 
3008 		for (k = 1; ; k++) {
3009 			struct sadb_comb *c;
3010 			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3011 			if (!aalg)
3012 				break;
3013 			if (!aalg->pfkey_supported)
3014 				continue;
3015 			if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3016 				continue;
3017 			c = skb_put(skb, sizeof(struct sadb_comb));
3018 			memset(c, 0, sizeof(*c));
3019 			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3020 			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3021 			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3022 			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3023 			c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3024 			c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3025 			c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3026 			c->sadb_comb_hard_addtime = 24*60*60;
3027 			c->sadb_comb_soft_addtime = 20*60*60;
3028 			c->sadb_comb_hard_usetime = 8*60*60;
3029 			c->sadb_comb_soft_usetime = 7*60*60;
3030 			sz += sizeof(*c);
3031 		}
3032 	}
3033 
3034 	return sz + sizeof(*p);
3035 }
3036 
key_notify_policy_expire(struct xfrm_policy * xp,const struct km_event * c)3037 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3038 {
3039 	return 0;
3040 }
3041 
key_notify_sa_expire(struct xfrm_state * x,const struct km_event * c)3042 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3043 {
3044 	struct sk_buff *out_skb;
3045 	struct sadb_msg *out_hdr;
3046 	int hard;
3047 	int hsc;
3048 
3049 	hard = c->data.hard;
3050 	if (hard)
3051 		hsc = 2;
3052 	else
3053 		hsc = 1;
3054 
3055 	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3056 	if (IS_ERR(out_skb))
3057 		return PTR_ERR(out_skb);
3058 
3059 	out_hdr = (struct sadb_msg *) out_skb->data;
3060 	out_hdr->sadb_msg_version = PF_KEY_V2;
3061 	out_hdr->sadb_msg_type = SADB_EXPIRE;
3062 	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3063 	out_hdr->sadb_msg_errno = 0;
3064 	out_hdr->sadb_msg_reserved = 0;
3065 	out_hdr->sadb_msg_seq = 0;
3066 	out_hdr->sadb_msg_pid = 0;
3067 
3068 	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3069 			xs_net(x));
3070 	return 0;
3071 }
3072 
pfkey_send_notify(struct xfrm_state * x,const struct km_event * c)3073 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3074 {
3075 	struct net *net = x ? xs_net(x) : c->net;
3076 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3077 
3078 	if (atomic_read(&net_pfkey->socks_nr) == 0)
3079 		return 0;
3080 
3081 	switch (c->event) {
3082 	case XFRM_MSG_EXPIRE:
3083 		return key_notify_sa_expire(x, c);
3084 	case XFRM_MSG_DELSA:
3085 	case XFRM_MSG_NEWSA:
3086 	case XFRM_MSG_UPDSA:
3087 		return key_notify_sa(x, c);
3088 	case XFRM_MSG_FLUSHSA:
3089 		return key_notify_sa_flush(c);
3090 	case XFRM_MSG_NEWAE: /* not yet supported */
3091 		break;
3092 	default:
3093 		pr_err("pfkey: Unknown SA event %d\n", c->event);
3094 		break;
3095 	}
3096 
3097 	return 0;
3098 }
3099 
pfkey_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3100 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3101 {
3102 	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3103 		return 0;
3104 
3105 	switch (c->event) {
3106 	case XFRM_MSG_POLEXPIRE:
3107 		return key_notify_policy_expire(xp, c);
3108 	case XFRM_MSG_DELPOLICY:
3109 	case XFRM_MSG_NEWPOLICY:
3110 	case XFRM_MSG_UPDPOLICY:
3111 		return key_notify_policy(xp, dir, c);
3112 	case XFRM_MSG_FLUSHPOLICY:
3113 		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3114 			break;
3115 		return key_notify_policy_flush(c);
3116 	default:
3117 		pr_err("pfkey: Unknown policy event %d\n", c->event);
3118 		break;
3119 	}
3120 
3121 	return 0;
3122 }
3123 
get_acqseq(void)3124 static u32 get_acqseq(void)
3125 {
3126 	u32 res;
3127 	static atomic_t acqseq;
3128 
3129 	do {
3130 		res = atomic_inc_return(&acqseq);
3131 	} while (!res);
3132 	return res;
3133 }
3134 
pfkey_is_alive(const struct km_event * c)3135 static bool pfkey_is_alive(const struct km_event *c)
3136 {
3137 	struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3138 	struct sock *sk;
3139 	bool is_alive = false;
3140 
3141 	rcu_read_lock();
3142 	sk_for_each_rcu(sk, &net_pfkey->table) {
3143 		if (pfkey_sk(sk)->registered) {
3144 			is_alive = true;
3145 			break;
3146 		}
3147 	}
3148 	rcu_read_unlock();
3149 
3150 	return is_alive;
3151 }
3152 
pfkey_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * xp)3153 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3154 {
3155 	struct sk_buff *skb;
3156 	struct sadb_msg *hdr;
3157 	struct sadb_address *addr;
3158 	struct sadb_x_policy *pol;
3159 	int sockaddr_size;
3160 	int size;
3161 	struct sadb_x_sec_ctx *sec_ctx;
3162 	struct xfrm_sec_ctx *xfrm_ctx;
3163 	int ctx_size = 0;
3164 	int alg_size = 0;
3165 
3166 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
3167 	if (!sockaddr_size)
3168 		return -EINVAL;
3169 
3170 	size = sizeof(struct sadb_msg) +
3171 		(sizeof(struct sadb_address) * 2) +
3172 		(sockaddr_size * 2) +
3173 		sizeof(struct sadb_x_policy);
3174 
3175 	if (x->id.proto == IPPROTO_AH)
3176 		alg_size = count_ah_combs(t);
3177 	else if (x->id.proto == IPPROTO_ESP)
3178 		alg_size = count_esp_combs(t);
3179 
3180 	if ((xfrm_ctx = x->security)) {
3181 		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3182 		size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3183 	}
3184 
3185 	skb =  alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3186 	if (skb == NULL)
3187 		return -ENOMEM;
3188 
3189 	hdr = skb_put(skb, sizeof(struct sadb_msg));
3190 	hdr->sadb_msg_version = PF_KEY_V2;
3191 	hdr->sadb_msg_type = SADB_ACQUIRE;
3192 	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3193 	hdr->sadb_msg_len = size / sizeof(uint64_t);
3194 	hdr->sadb_msg_errno = 0;
3195 	hdr->sadb_msg_reserved = 0;
3196 	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3197 	hdr->sadb_msg_pid = 0;
3198 
3199 	/* src address */
3200 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3201 	addr->sadb_address_len =
3202 		(sizeof(struct sadb_address)+sockaddr_size)/
3203 			sizeof(uint64_t);
3204 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3205 	addr->sadb_address_proto = 0;
3206 	addr->sadb_address_reserved = 0;
3207 	addr->sadb_address_prefixlen =
3208 		pfkey_sockaddr_fill(&x->props.saddr, 0,
3209 				    (struct sockaddr *) (addr + 1),
3210 				    x->props.family);
3211 	if (!addr->sadb_address_prefixlen)
3212 		BUG();
3213 
3214 	/* dst address */
3215 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3216 	addr->sadb_address_len =
3217 		(sizeof(struct sadb_address)+sockaddr_size)/
3218 			sizeof(uint64_t);
3219 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3220 	addr->sadb_address_proto = 0;
3221 	addr->sadb_address_reserved = 0;
3222 	addr->sadb_address_prefixlen =
3223 		pfkey_sockaddr_fill(&x->id.daddr, 0,
3224 				    (struct sockaddr *) (addr + 1),
3225 				    x->props.family);
3226 	if (!addr->sadb_address_prefixlen)
3227 		BUG();
3228 
3229 	pol = skb_put(skb, sizeof(struct sadb_x_policy));
3230 	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3231 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3232 	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3233 	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3234 	pol->sadb_x_policy_reserved = 0;
3235 	pol->sadb_x_policy_id = xp->index;
3236 	pol->sadb_x_policy_priority = xp->priority;
3237 
3238 	/* Set sadb_comb's. */
3239 	alg_size = 0;
3240 	if (x->id.proto == IPPROTO_AH)
3241 		alg_size = dump_ah_combs(skb, t);
3242 	else if (x->id.proto == IPPROTO_ESP)
3243 		alg_size = dump_esp_combs(skb, t);
3244 
3245 	hdr->sadb_msg_len += alg_size / 8;
3246 
3247 	/* security context */
3248 	if (xfrm_ctx) {
3249 		sec_ctx = skb_put(skb,
3250 				  sizeof(struct sadb_x_sec_ctx) + ctx_size);
3251 		sec_ctx->sadb_x_sec_len =
3252 		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3253 		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3254 		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3255 		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3256 		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3257 		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3258 		       xfrm_ctx->ctx_len);
3259 	}
3260 
3261 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3262 			       xs_net(x));
3263 }
3264 
pfkey_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3265 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3266 						u8 *data, int len, int *dir)
3267 {
3268 	struct net *net = sock_net(sk);
3269 	struct xfrm_policy *xp;
3270 	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3271 	struct sadb_x_sec_ctx *sec_ctx;
3272 
3273 	switch (sk->sk_family) {
3274 	case AF_INET:
3275 		if (opt != IP_IPSEC_POLICY) {
3276 			*dir = -EOPNOTSUPP;
3277 			return NULL;
3278 		}
3279 		break;
3280 #if IS_ENABLED(CONFIG_IPV6)
3281 	case AF_INET6:
3282 		if (opt != IPV6_IPSEC_POLICY) {
3283 			*dir = -EOPNOTSUPP;
3284 			return NULL;
3285 		}
3286 		break;
3287 #endif
3288 	default:
3289 		*dir = -EINVAL;
3290 		return NULL;
3291 	}
3292 
3293 	*dir = -EINVAL;
3294 
3295 	if (len < sizeof(struct sadb_x_policy) ||
3296 	    pol->sadb_x_policy_len*8 > len ||
3297 	    pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3298 	    (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3299 		return NULL;
3300 
3301 	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3302 	if (xp == NULL) {
3303 		*dir = -ENOBUFS;
3304 		return NULL;
3305 	}
3306 
3307 	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3308 		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3309 
3310 	xp->lft.soft_byte_limit = XFRM_INF;
3311 	xp->lft.hard_byte_limit = XFRM_INF;
3312 	xp->lft.soft_packet_limit = XFRM_INF;
3313 	xp->lft.hard_packet_limit = XFRM_INF;
3314 	xp->family = sk->sk_family;
3315 
3316 	xp->xfrm_nr = 0;
3317 	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3318 	    (*dir = parse_ipsecrequests(xp, pol)) < 0)
3319 		goto out;
3320 
3321 	/* security context too */
3322 	if (len >= (pol->sadb_x_policy_len*8 +
3323 	    sizeof(struct sadb_x_sec_ctx))) {
3324 		char *p = (char *)pol;
3325 		struct xfrm_user_sec_ctx *uctx;
3326 
3327 		p += pol->sadb_x_policy_len*8;
3328 		sec_ctx = (struct sadb_x_sec_ctx *)p;
3329 		if (len < pol->sadb_x_policy_len*8 +
3330 		    sec_ctx->sadb_x_sec_len*8) {
3331 			*dir = -EINVAL;
3332 			goto out;
3333 		}
3334 		if ((*dir = verify_sec_ctx_len(p)))
3335 			goto out;
3336 		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3337 		*dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3338 		kfree(uctx);
3339 
3340 		if (*dir)
3341 			goto out;
3342 	}
3343 
3344 	*dir = pol->sadb_x_policy_dir-1;
3345 	return xp;
3346 
3347 out:
3348 	xp->walk.dead = 1;
3349 	xfrm_policy_destroy(xp);
3350 	return NULL;
3351 }
3352 
pfkey_send_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3353 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3354 {
3355 	struct sk_buff *skb;
3356 	struct sadb_msg *hdr;
3357 	struct sadb_sa *sa;
3358 	struct sadb_address *addr;
3359 	struct sadb_x_nat_t_port *n_port;
3360 	int sockaddr_size;
3361 	int size;
3362 	__u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3363 	struct xfrm_encap_tmpl *natt = NULL;
3364 
3365 	sockaddr_size = pfkey_sockaddr_size(x->props.family);
3366 	if (!sockaddr_size)
3367 		return -EINVAL;
3368 
3369 	if (!satype)
3370 		return -EINVAL;
3371 
3372 	if (!x->encap)
3373 		return -EINVAL;
3374 
3375 	natt = x->encap;
3376 
3377 	/* Build an SADB_X_NAT_T_NEW_MAPPING message:
3378 	 *
3379 	 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3380 	 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3381 	 */
3382 
3383 	size = sizeof(struct sadb_msg) +
3384 		sizeof(struct sadb_sa) +
3385 		(sizeof(struct sadb_address) * 2) +
3386 		(sockaddr_size * 2) +
3387 		(sizeof(struct sadb_x_nat_t_port) * 2);
3388 
3389 	skb =  alloc_skb(size + 16, GFP_ATOMIC);
3390 	if (skb == NULL)
3391 		return -ENOMEM;
3392 
3393 	hdr = skb_put(skb, sizeof(struct sadb_msg));
3394 	hdr->sadb_msg_version = PF_KEY_V2;
3395 	hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3396 	hdr->sadb_msg_satype = satype;
3397 	hdr->sadb_msg_len = size / sizeof(uint64_t);
3398 	hdr->sadb_msg_errno = 0;
3399 	hdr->sadb_msg_reserved = 0;
3400 	hdr->sadb_msg_seq = x->km.seq;
3401 	hdr->sadb_msg_pid = 0;
3402 
3403 	/* SA */
3404 	sa = skb_put(skb, sizeof(struct sadb_sa));
3405 	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3406 	sa->sadb_sa_exttype = SADB_EXT_SA;
3407 	sa->sadb_sa_spi = x->id.spi;
3408 	sa->sadb_sa_replay = 0;
3409 	sa->sadb_sa_state = 0;
3410 	sa->sadb_sa_auth = 0;
3411 	sa->sadb_sa_encrypt = 0;
3412 	sa->sadb_sa_flags = 0;
3413 
3414 	/* ADDRESS_SRC (old addr) */
3415 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3416 	addr->sadb_address_len =
3417 		(sizeof(struct sadb_address)+sockaddr_size)/
3418 			sizeof(uint64_t);
3419 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3420 	addr->sadb_address_proto = 0;
3421 	addr->sadb_address_reserved = 0;
3422 	addr->sadb_address_prefixlen =
3423 		pfkey_sockaddr_fill(&x->props.saddr, 0,
3424 				    (struct sockaddr *) (addr + 1),
3425 				    x->props.family);
3426 	if (!addr->sadb_address_prefixlen)
3427 		BUG();
3428 
3429 	/* NAT_T_SPORT (old port) */
3430 	n_port = skb_put(skb, sizeof(*n_port));
3431 	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3432 	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3433 	n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3434 	n_port->sadb_x_nat_t_port_reserved = 0;
3435 
3436 	/* ADDRESS_DST (new addr) */
3437 	addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3438 	addr->sadb_address_len =
3439 		(sizeof(struct sadb_address)+sockaddr_size)/
3440 			sizeof(uint64_t);
3441 	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3442 	addr->sadb_address_proto = 0;
3443 	addr->sadb_address_reserved = 0;
3444 	addr->sadb_address_prefixlen =
3445 		pfkey_sockaddr_fill(ipaddr, 0,
3446 				    (struct sockaddr *) (addr + 1),
3447 				    x->props.family);
3448 	if (!addr->sadb_address_prefixlen)
3449 		BUG();
3450 
3451 	/* NAT_T_DPORT (new port) */
3452 	n_port = skb_put(skb, sizeof(*n_port));
3453 	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3454 	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3455 	n_port->sadb_x_nat_t_port_port = sport;
3456 	n_port->sadb_x_nat_t_port_reserved = 0;
3457 
3458 	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3459 			       xs_net(x));
3460 }
3461 
3462 #ifdef CONFIG_NET_KEY_MIGRATE
set_sadb_address(struct sk_buff * skb,int sasize,int type,const struct xfrm_selector * sel)3463 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3464 			    const struct xfrm_selector *sel)
3465 {
3466 	struct sadb_address *addr;
3467 	addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3468 	addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3469 	addr->sadb_address_exttype = type;
3470 	addr->sadb_address_proto = sel->proto;
3471 	addr->sadb_address_reserved = 0;
3472 
3473 	switch (type) {
3474 	case SADB_EXT_ADDRESS_SRC:
3475 		addr->sadb_address_prefixlen = sel->prefixlen_s;
3476 		pfkey_sockaddr_fill(&sel->saddr, 0,
3477 				    (struct sockaddr *)(addr + 1),
3478 				    sel->family);
3479 		break;
3480 	case SADB_EXT_ADDRESS_DST:
3481 		addr->sadb_address_prefixlen = sel->prefixlen_d;
3482 		pfkey_sockaddr_fill(&sel->daddr, 0,
3483 				    (struct sockaddr *)(addr + 1),
3484 				    sel->family);
3485 		break;
3486 	default:
3487 		return -EINVAL;
3488 	}
3489 
3490 	return 0;
3491 }
3492 
3493 
set_sadb_kmaddress(struct sk_buff * skb,const struct xfrm_kmaddress * k)3494 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3495 {
3496 	struct sadb_x_kmaddress *kma;
3497 	u8 *sa;
3498 	int family = k->family;
3499 	int socklen = pfkey_sockaddr_len(family);
3500 	int size_req;
3501 
3502 	size_req = (sizeof(struct sadb_x_kmaddress) +
3503 		    pfkey_sockaddr_pair_size(family));
3504 
3505 	kma = skb_put_zero(skb, size_req);
3506 	kma->sadb_x_kmaddress_len = size_req / 8;
3507 	kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3508 	kma->sadb_x_kmaddress_reserved = k->reserved;
3509 
3510 	sa = (u8 *)(kma + 1);
3511 	if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3512 	    !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3513 		return -EINVAL;
3514 
3515 	return 0;
3516 }
3517 
set_ipsecrequest(struct sk_buff * skb,uint8_t proto,uint8_t mode,int level,uint32_t reqid,uint8_t family,const xfrm_address_t * src,const xfrm_address_t * dst)3518 static int set_ipsecrequest(struct sk_buff *skb,
3519 			    uint8_t proto, uint8_t mode, int level,
3520 			    uint32_t reqid, uint8_t family,
3521 			    const xfrm_address_t *src, const xfrm_address_t *dst)
3522 {
3523 	struct sadb_x_ipsecrequest *rq;
3524 	u8 *sa;
3525 	int socklen = pfkey_sockaddr_len(family);
3526 	int size_req;
3527 
3528 	size_req = sizeof(struct sadb_x_ipsecrequest) +
3529 		   pfkey_sockaddr_pair_size(family);
3530 
3531 	rq = skb_put_zero(skb, size_req);
3532 	rq->sadb_x_ipsecrequest_len = size_req;
3533 	rq->sadb_x_ipsecrequest_proto = proto;
3534 	rq->sadb_x_ipsecrequest_mode = mode;
3535 	rq->sadb_x_ipsecrequest_level = level;
3536 	rq->sadb_x_ipsecrequest_reqid = reqid;
3537 
3538 	sa = (u8 *) (rq + 1);
3539 	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3540 	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3541 		return -EINVAL;
3542 
3543 	return 0;
3544 }
3545 #endif
3546 
3547 #ifdef CONFIG_NET_KEY_MIGRATE
pfkey_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_bundles,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3548 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3549 			      const struct xfrm_migrate *m, int num_bundles,
3550 			      const struct xfrm_kmaddress *k,
3551 			      const struct xfrm_encap_tmpl *encap)
3552 {
3553 	int i;
3554 	int sasize_sel;
3555 	int size = 0;
3556 	int size_pol = 0;
3557 	struct sk_buff *skb;
3558 	struct sadb_msg *hdr;
3559 	struct sadb_x_policy *pol;
3560 	const struct xfrm_migrate *mp;
3561 
3562 	if (type != XFRM_POLICY_TYPE_MAIN)
3563 		return 0;
3564 
3565 	if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3566 		return -EINVAL;
3567 
3568 	if (k != NULL) {
3569 		/* addresses for KM */
3570 		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3571 				     pfkey_sockaddr_pair_size(k->family));
3572 	}
3573 
3574 	/* selector */
3575 	sasize_sel = pfkey_sockaddr_size(sel->family);
3576 	if (!sasize_sel)
3577 		return -EINVAL;
3578 	size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3579 
3580 	/* policy info */
3581 	size_pol += sizeof(struct sadb_x_policy);
3582 
3583 	/* ipsecrequests */
3584 	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3585 		/* old locator pair */
3586 		size_pol += sizeof(struct sadb_x_ipsecrequest) +
3587 			    pfkey_sockaddr_pair_size(mp->old_family);
3588 		/* new locator pair */
3589 		size_pol += sizeof(struct sadb_x_ipsecrequest) +
3590 			    pfkey_sockaddr_pair_size(mp->new_family);
3591 	}
3592 
3593 	size += sizeof(struct sadb_msg) + size_pol;
3594 
3595 	/* alloc buffer */
3596 	skb = alloc_skb(size, GFP_ATOMIC);
3597 	if (skb == NULL)
3598 		return -ENOMEM;
3599 
3600 	hdr = skb_put(skb, sizeof(struct sadb_msg));
3601 	hdr->sadb_msg_version = PF_KEY_V2;
3602 	hdr->sadb_msg_type = SADB_X_MIGRATE;
3603 	hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3604 	hdr->sadb_msg_len = size / 8;
3605 	hdr->sadb_msg_errno = 0;
3606 	hdr->sadb_msg_reserved = 0;
3607 	hdr->sadb_msg_seq = 0;
3608 	hdr->sadb_msg_pid = 0;
3609 
3610 	/* Addresses to be used by KM for negotiation, if ext is available */
3611 	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3612 		goto err;
3613 
3614 	/* selector src */
3615 	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3616 
3617 	/* selector dst */
3618 	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3619 
3620 	/* policy information */
3621 	pol = skb_put(skb, sizeof(struct sadb_x_policy));
3622 	pol->sadb_x_policy_len = size_pol / 8;
3623 	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3624 	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3625 	pol->sadb_x_policy_dir = dir + 1;
3626 	pol->sadb_x_policy_reserved = 0;
3627 	pol->sadb_x_policy_id = 0;
3628 	pol->sadb_x_policy_priority = 0;
3629 
3630 	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3631 		/* old ipsecrequest */
3632 		int mode = pfkey_mode_from_xfrm(mp->mode);
3633 		if (mode < 0)
3634 			goto err;
3635 		if (set_ipsecrequest(skb, mp->proto, mode,
3636 				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3637 				     mp->reqid, mp->old_family,
3638 				     &mp->old_saddr, &mp->old_daddr) < 0)
3639 			goto err;
3640 
3641 		/* new ipsecrequest */
3642 		if (set_ipsecrequest(skb, mp->proto, mode,
3643 				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3644 				     mp->reqid, mp->new_family,
3645 				     &mp->new_saddr, &mp->new_daddr) < 0)
3646 			goto err;
3647 	}
3648 
3649 	/* broadcast migrate message to sockets */
3650 	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3651 
3652 	return 0;
3653 
3654 err:
3655 	kfree_skb(skb);
3656 	return -EINVAL;
3657 }
3658 #else
pfkey_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_bundles,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3659 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3660 			      const struct xfrm_migrate *m, int num_bundles,
3661 			      const struct xfrm_kmaddress *k,
3662 			      const struct xfrm_encap_tmpl *encap)
3663 {
3664 	return -ENOPROTOOPT;
3665 }
3666 #endif
3667 
pfkey_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)3668 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3669 {
3670 	struct sock *sk = sock->sk;
3671 	struct sk_buff *skb = NULL;
3672 	struct sadb_msg *hdr = NULL;
3673 	int err;
3674 	struct net *net = sock_net(sk);
3675 
3676 	err = -EOPNOTSUPP;
3677 	if (msg->msg_flags & MSG_OOB)
3678 		goto out;
3679 
3680 	err = -EMSGSIZE;
3681 	if ((unsigned int)len > sk->sk_sndbuf - 32)
3682 		goto out;
3683 
3684 	err = -ENOBUFS;
3685 	skb = alloc_skb(len, GFP_KERNEL);
3686 	if (skb == NULL)
3687 		goto out;
3688 
3689 	err = -EFAULT;
3690 	if (memcpy_from_msg(skb_put(skb,len), msg, len))
3691 		goto out;
3692 
3693 	hdr = pfkey_get_base_msg(skb, &err);
3694 	if (!hdr)
3695 		goto out;
3696 
3697 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3698 	err = pfkey_process(sk, skb, hdr);
3699 	mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3700 
3701 out:
3702 	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3703 		err = 0;
3704 	kfree_skb(skb);
3705 
3706 	return err ? : len;
3707 }
3708 
pfkey_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)3709 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3710 			 int flags)
3711 {
3712 	struct sock *sk = sock->sk;
3713 	struct pfkey_sock *pfk = pfkey_sk(sk);
3714 	struct sk_buff *skb;
3715 	int copied, err;
3716 
3717 	err = -EINVAL;
3718 	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3719 		goto out;
3720 
3721 	skb = skb_recv_datagram(sk, flags, &err);
3722 	if (skb == NULL)
3723 		goto out;
3724 
3725 	copied = skb->len;
3726 	if (copied > len) {
3727 		msg->msg_flags |= MSG_TRUNC;
3728 		copied = len;
3729 	}
3730 
3731 	skb_reset_transport_header(skb);
3732 	err = skb_copy_datagram_msg(skb, 0, msg, copied);
3733 	if (err)
3734 		goto out_free;
3735 
3736 	sock_recv_cmsgs(msg, sk, skb);
3737 
3738 	err = (flags & MSG_TRUNC) ? skb->len : copied;
3739 
3740 	if (pfk->dump.dump != NULL &&
3741 	    3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3742 		pfkey_do_dump(pfk);
3743 
3744 out_free:
3745 	skb_free_datagram(sk, skb);
3746 out:
3747 	return err;
3748 }
3749 
3750 static const struct proto_ops pfkey_ops = {
3751 	.family		=	PF_KEY,
3752 	.owner		=	THIS_MODULE,
3753 	/* Operations that make no sense on pfkey sockets. */
3754 	.bind		=	sock_no_bind,
3755 	.connect	=	sock_no_connect,
3756 	.socketpair	=	sock_no_socketpair,
3757 	.accept		=	sock_no_accept,
3758 	.getname	=	sock_no_getname,
3759 	.ioctl		=	sock_no_ioctl,
3760 	.listen		=	sock_no_listen,
3761 	.shutdown	=	sock_no_shutdown,
3762 	.mmap		=	sock_no_mmap,
3763 
3764 	/* Now the operations that really occur. */
3765 	.release	=	pfkey_release,
3766 	.poll		=	datagram_poll,
3767 	.sendmsg	=	pfkey_sendmsg,
3768 	.recvmsg	=	pfkey_recvmsg,
3769 };
3770 
3771 static const struct net_proto_family pfkey_family_ops = {
3772 	.family	=	PF_KEY,
3773 	.create	=	pfkey_create,
3774 	.owner	=	THIS_MODULE,
3775 };
3776 
3777 #ifdef CONFIG_PROC_FS
pfkey_seq_show(struct seq_file * f,void * v)3778 static int pfkey_seq_show(struct seq_file *f, void *v)
3779 {
3780 	struct sock *s = sk_entry(v);
3781 
3782 	if (v == SEQ_START_TOKEN)
3783 		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3784 	else
3785 		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3786 			       s,
3787 			       refcount_read(&s->sk_refcnt),
3788 			       sk_rmem_alloc_get(s),
3789 			       sk_wmem_alloc_get(s),
3790 			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3791 			       sock_i_ino(s)
3792 			       );
3793 	return 0;
3794 }
3795 
pfkey_seq_start(struct seq_file * f,loff_t * ppos)3796 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3797 	__acquires(rcu)
3798 {
3799 	struct net *net = seq_file_net(f);
3800 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3801 
3802 	rcu_read_lock();
3803 	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3804 }
3805 
pfkey_seq_next(struct seq_file * f,void * v,loff_t * ppos)3806 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3807 {
3808 	struct net *net = seq_file_net(f);
3809 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3810 
3811 	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3812 }
3813 
pfkey_seq_stop(struct seq_file * f,void * v)3814 static void pfkey_seq_stop(struct seq_file *f, void *v)
3815 	__releases(rcu)
3816 {
3817 	rcu_read_unlock();
3818 }
3819 
3820 static const struct seq_operations pfkey_seq_ops = {
3821 	.start	= pfkey_seq_start,
3822 	.next	= pfkey_seq_next,
3823 	.stop	= pfkey_seq_stop,
3824 	.show	= pfkey_seq_show,
3825 };
3826 
pfkey_init_proc(struct net * net)3827 static int __net_init pfkey_init_proc(struct net *net)
3828 {
3829 	struct proc_dir_entry *e;
3830 
3831 	e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3832 			sizeof(struct seq_net_private));
3833 	if (e == NULL)
3834 		return -ENOMEM;
3835 
3836 	return 0;
3837 }
3838 
pfkey_exit_proc(struct net * net)3839 static void __net_exit pfkey_exit_proc(struct net *net)
3840 {
3841 	remove_proc_entry("pfkey", net->proc_net);
3842 }
3843 #else
pfkey_init_proc(struct net * net)3844 static inline int pfkey_init_proc(struct net *net)
3845 {
3846 	return 0;
3847 }
3848 
pfkey_exit_proc(struct net * net)3849 static inline void pfkey_exit_proc(struct net *net)
3850 {
3851 }
3852 #endif
3853 
3854 static struct xfrm_mgr pfkeyv2_mgr =
3855 {
3856 	.notify		= pfkey_send_notify,
3857 	.acquire	= pfkey_send_acquire,
3858 	.compile_policy	= pfkey_compile_policy,
3859 	.new_mapping	= pfkey_send_new_mapping,
3860 	.notify_policy	= pfkey_send_policy_notify,
3861 	.migrate	= pfkey_send_migrate,
3862 	.is_alive	= pfkey_is_alive,
3863 };
3864 
pfkey_net_init(struct net * net)3865 static int __net_init pfkey_net_init(struct net *net)
3866 {
3867 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3868 	int rv;
3869 
3870 	INIT_HLIST_HEAD(&net_pfkey->table);
3871 	atomic_set(&net_pfkey->socks_nr, 0);
3872 
3873 	rv = pfkey_init_proc(net);
3874 
3875 	return rv;
3876 }
3877 
pfkey_net_exit(struct net * net)3878 static void __net_exit pfkey_net_exit(struct net *net)
3879 {
3880 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3881 
3882 	pfkey_exit_proc(net);
3883 	WARN_ON(!hlist_empty(&net_pfkey->table));
3884 }
3885 
3886 static struct pernet_operations pfkey_net_ops = {
3887 	.init = pfkey_net_init,
3888 	.exit = pfkey_net_exit,
3889 	.id   = &pfkey_net_id,
3890 	.size = sizeof(struct netns_pfkey),
3891 };
3892 
ipsec_pfkey_exit(void)3893 static void __exit ipsec_pfkey_exit(void)
3894 {
3895 	xfrm_unregister_km(&pfkeyv2_mgr);
3896 	sock_unregister(PF_KEY);
3897 	unregister_pernet_subsys(&pfkey_net_ops);
3898 	proto_unregister(&key_proto);
3899 }
3900 
ipsec_pfkey_init(void)3901 static int __init ipsec_pfkey_init(void)
3902 {
3903 	int err = proto_register(&key_proto, 0);
3904 
3905 	if (err != 0)
3906 		goto out;
3907 
3908 	err = register_pernet_subsys(&pfkey_net_ops);
3909 	if (err != 0)
3910 		goto out_unregister_key_proto;
3911 	err = sock_register(&pfkey_family_ops);
3912 	if (err != 0)
3913 		goto out_unregister_pernet;
3914 	xfrm_register_km(&pfkeyv2_mgr);
3915 out:
3916 	return err;
3917 
3918 out_unregister_pernet:
3919 	unregister_pernet_subsys(&pfkey_net_ops);
3920 out_unregister_key_proto:
3921 	proto_unregister(&key_proto);
3922 	goto out;
3923 }
3924 
3925 module_init(ipsec_pfkey_init);
3926 module_exit(ipsec_pfkey_exit);
3927 MODULE_DESCRIPTION("PF_KEY socket helpers");
3928 MODULE_LICENSE("GPL");
3929 MODULE_ALIAS_NETPROTO(PF_KEY);
3930