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Merge tag 'mips_fixes_5.2_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips...
[linux-2.6/linux-2.6-arm.git] / net / key / af_key.c
bloba50dd6f34b917c2609be28b634f6f90506a0f8a5
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
69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70 {
71 return (struct pfkey_sock *)sk;
72 }
73
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
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
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
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
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
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 int err;
145
146 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
147 return -EPERM;
148 if (sock->type != SOCK_RAW)
149 return -ESOCKTNOSUPPORT;
150 if (protocol != PF_KEY_V2)
151 return -EPROTONOSUPPORT;
152
153 err = -ENOMEM;
154 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
155 if (sk == NULL)
156 goto out;
157
158 pfk = pfkey_sk(sk);
159 mutex_init(&pfk->dump_lock);
160
161 sock->ops = &pfkey_ops;
162 sock_init_data(sock, sk);
163
164 sk->sk_family = PF_KEY;
165 sk->sk_destruct = pfkey_sock_destruct;
166
167 atomic_inc(&net_pfkey->socks_nr);
168
169 pfkey_insert(sk);
170
171 return 0;
172 out:
173 return err;
174 }
175
176 static int pfkey_release(struct socket *sock)
177 {
178 struct sock *sk = sock->sk;
179
180 if (!sk)
181 return 0;
182
183 pfkey_remove(sk);
184
185 sock_orphan(sk);
186 sock->sk = NULL;
187 skb_queue_purge(&sk->sk_write_queue);
188
189 synchronize_rcu();
190 sock_put(sk);
191
192 return 0;
193 }
194
195 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
196 struct sock *sk)
197 {
198 int err = -ENOBUFS;
199
200 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
201 return err;
202
203 skb = skb_clone(skb, allocation);
204
205 if (skb) {
206 skb_set_owner_r(skb, sk);
207 skb_queue_tail(&sk->sk_receive_queue, skb);
208 sk->sk_data_ready(sk);
209 err = 0;
210 }
211 return err;
212 }
213
214 /* Send SKB to all pfkey sockets matching selected criteria. */
215 #define BROADCAST_ALL 0
216 #define BROADCAST_ONE 1
217 #define BROADCAST_REGISTERED 2
218 #define BROADCAST_PROMISC_ONLY 4
219 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
220 int broadcast_flags, struct sock *one_sk,
221 struct net *net)
222 {
223 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
224 struct sock *sk;
225 int err = -ESRCH;
226
227 /* XXX Do we need something like netlink_overrun? I think
228 * XXX PF_KEY socket apps will not mind current behavior.
229 */
230 if (!skb)
231 return -ENOMEM;
232
233 rcu_read_lock();
234 sk_for_each_rcu(sk, &net_pfkey->table) {
235 struct pfkey_sock *pfk = pfkey_sk(sk);
236 int err2;
237
238 /* Yes, it means that if you are meant to receive this
239 * pfkey message you receive it twice as promiscuous
240 * socket.
241 */
242 if (pfk->promisc)
243 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
244
245 /* the exact target will be processed later */
246 if (sk == one_sk)
247 continue;
248 if (broadcast_flags != BROADCAST_ALL) {
249 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
250 continue;
251 if ((broadcast_flags & BROADCAST_REGISTERED) &&
252 !pfk->registered)
253 continue;
254 if (broadcast_flags & BROADCAST_ONE)
255 continue;
256 }
257
258 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
259
260 /* Error is cleared after successful sending to at least one
261 * registered KM */
262 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
263 err = err2;
264 }
265 rcu_read_unlock();
266
267 if (one_sk != NULL)
268 err = pfkey_broadcast_one(skb, allocation, one_sk);
269
270 kfree_skb(skb);
271 return err;
272 }
273
274 static int pfkey_do_dump(struct pfkey_sock *pfk)
275 {
276 struct sadb_msg *hdr;
277 int rc;
278
279 mutex_lock(&pfk->dump_lock);
280 if (!pfk->dump.dump) {
281 rc = 0;
282 goto out;
283 }
284
285 rc = pfk->dump.dump(pfk);
286 if (rc == -ENOBUFS) {
287 rc = 0;
288 goto out;
289 }
290
291 if (pfk->dump.skb) {
292 if (!pfkey_can_dump(&pfk->sk)) {
293 rc = 0;
294 goto out;
295 }
296
297 hdr = (struct sadb_msg *) pfk->dump.skb->data;
298 hdr->sadb_msg_seq = 0;
299 hdr->sadb_msg_errno = rc;
300 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
301 &pfk->sk, sock_net(&pfk->sk));
302 pfk->dump.skb = NULL;
303 }
304
305 pfkey_terminate_dump(pfk);
306
307 out:
308 mutex_unlock(&pfk->dump_lock);
309 return rc;
310 }
311
312 static inline void pfkey_hdr_dup(struct sadb_msg *new,
313 const struct sadb_msg *orig)
314 {
315 *new = *orig;
316 }
317
318 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
319 {
320 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
321 struct sadb_msg *hdr;
322
323 if (!skb)
324 return -ENOBUFS;
325
326 /* Woe be to the platform trying to support PFKEY yet
327 * having normal errnos outside the 1-255 range, inclusive.
328 */
329 err = -err;
330 if (err == ERESTARTSYS ||
331 err == ERESTARTNOHAND ||
332 err == ERESTARTNOINTR)
333 err = EINTR;
334 if (err >= 512)
335 err = EINVAL;
336 BUG_ON(err <= 0 || err >= 256);
337
338 hdr = skb_put(skb, sizeof(struct sadb_msg));
339 pfkey_hdr_dup(hdr, orig);
340 hdr->sadb_msg_errno = (uint8_t) err;
341 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
342 sizeof(uint64_t));
343
344 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
345
346 return 0;
347 }
348
349 static const u8 sadb_ext_min_len[] = {
350 [SADB_EXT_RESERVED] = (u8) 0,
351 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
352 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
353 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
354 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
355 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
356 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
357 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
358 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
359 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
360 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
361 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
362 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
363 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
364 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
365 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
366 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
367 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
368 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
369 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
370 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
371 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
372 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
373 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
374 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
375 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
376 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
377 };
378
379 /* Verify sadb_address_{len,prefixlen} against sa_family. */
380 static int verify_address_len(const void *p)
381 {
382 const struct sadb_address *sp = p;
383 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
384 const struct sockaddr_in *sin;
385 #if IS_ENABLED(CONFIG_IPV6)
386 const struct sockaddr_in6 *sin6;
387 #endif
388 int len;
389
390 if (sp->sadb_address_len <
391 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
392 sizeof(uint64_t)))
393 return -EINVAL;
394
395 switch (addr->sa_family) {
396 case AF_INET:
397 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
398 if (sp->sadb_address_len != len ||
399 sp->sadb_address_prefixlen > 32)
400 return -EINVAL;
401 break;
402 #if IS_ENABLED(CONFIG_IPV6)
403 case AF_INET6:
404 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
405 if (sp->sadb_address_len != len ||
406 sp->sadb_address_prefixlen > 128)
407 return -EINVAL;
408 break;
409 #endif
410 default:
411 /* It is user using kernel to keep track of security
412 * associations for another protocol, such as
413 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
414 * lengths.
415 *
416 * XXX Actually, association/policy database is not yet
417 * XXX able to cope with arbitrary sockaddr families.
418 * XXX When it can, remove this -EINVAL. -DaveM
419 */
420 return -EINVAL;
421 }
422
423 return 0;
424 }
425
426 static inline int sadb_key_len(const struct sadb_key *key)
427 {
428 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
429
430 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
431 sizeof(uint64_t));
432 }
433
434 static int verify_key_len(const void *p)
435 {
436 const struct sadb_key *key = p;
437
438 if (sadb_key_len(key) > key->sadb_key_len)
439 return -EINVAL;
440
441 return 0;
442 }
443
444 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
445 {
446 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
447 sec_ctx->sadb_x_ctx_len,
448 sizeof(uint64_t));
449 }
450
451 static inline int verify_sec_ctx_len(const void *p)
452 {
453 const struct sadb_x_sec_ctx *sec_ctx = p;
454 int len = sec_ctx->sadb_x_ctx_len;
455
456 if (len > PAGE_SIZE)
457 return -EINVAL;
458
459 len = pfkey_sec_ctx_len(sec_ctx);
460
461 if (sec_ctx->sadb_x_sec_len != len)
462 return -EINVAL;
463
464 return 0;
465 }
466
467 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
468 gfp_t gfp)
469 {
470 struct xfrm_user_sec_ctx *uctx = NULL;
471 int ctx_size = sec_ctx->sadb_x_ctx_len;
472
473 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
474
475 if (!uctx)
476 return NULL;
477
478 uctx->len = pfkey_sec_ctx_len(sec_ctx);
479 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
480 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
481 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
482 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
483 memcpy(uctx + 1, sec_ctx + 1,
484 uctx->ctx_len);
485
486 return uctx;
487 }
488
489 static int present_and_same_family(const struct sadb_address *src,
490 const struct sadb_address *dst)
491 {
492 const struct sockaddr *s_addr, *d_addr;
493
494 if (!src || !dst)
495 return 0;
496
497 s_addr = (const struct sockaddr *)(src + 1);
498 d_addr = (const struct sockaddr *)(dst + 1);
499 if (s_addr->sa_family != d_addr->sa_family)
500 return 0;
501 if (s_addr->sa_family != AF_INET
502 #if IS_ENABLED(CONFIG_IPV6)
503 && s_addr->sa_family != AF_INET6
504 #endif
505 )
506 return 0;
507
508 return 1;
509 }
510
511 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
512 {
513 const char *p = (char *) hdr;
514 int len = skb->len;
515
516 len -= sizeof(*hdr);
517 p += sizeof(*hdr);
518 while (len > 0) {
519 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
520 uint16_t ext_type;
521 int ext_len;
522
523 if (len < sizeof(*ehdr))
524 return -EINVAL;
525
526 ext_len = ehdr->sadb_ext_len;
527 ext_len *= sizeof(uint64_t);
528 ext_type = ehdr->sadb_ext_type;
529 if (ext_len < sizeof(uint64_t) ||
530 ext_len > len ||
531 ext_type == SADB_EXT_RESERVED)
532 return -EINVAL;
533
534 if (ext_type <= SADB_EXT_MAX) {
535 int min = (int) sadb_ext_min_len[ext_type];
536 if (ext_len < min)
537 return -EINVAL;
538 if (ext_hdrs[ext_type-1] != NULL)
539 return -EINVAL;
540 switch (ext_type) {
541 case SADB_EXT_ADDRESS_SRC:
542 case SADB_EXT_ADDRESS_DST:
543 case SADB_EXT_ADDRESS_PROXY:
544 case SADB_X_EXT_NAT_T_OA:
545 if (verify_address_len(p))
546 return -EINVAL;
547 break;
548 case SADB_X_EXT_SEC_CTX:
549 if (verify_sec_ctx_len(p))
550 return -EINVAL;
551 break;
552 case SADB_EXT_KEY_AUTH:
553 case SADB_EXT_KEY_ENCRYPT:
554 if (verify_key_len(p))
555 return -EINVAL;
556 break;
557 default:
558 break;
559 }
560 ext_hdrs[ext_type-1] = (void *) p;
561 }
562 p += ext_len;
563 len -= ext_len;
564 }
565
566 return 0;
567 }
568
569 static uint16_t
570 pfkey_satype2proto(uint8_t satype)
571 {
572 switch (satype) {
573 case SADB_SATYPE_UNSPEC:
574 return IPSEC_PROTO_ANY;
575 case SADB_SATYPE_AH:
576 return IPPROTO_AH;
577 case SADB_SATYPE_ESP:
578 return IPPROTO_ESP;
579 case SADB_X_SATYPE_IPCOMP:
580 return IPPROTO_COMP;
581 default:
582 return 0;
583 }
584 /* NOTREACHED */
585 }
586
587 static uint8_t
588 pfkey_proto2satype(uint16_t proto)
589 {
590 switch (proto) {
591 case IPPROTO_AH:
592 return SADB_SATYPE_AH;
593 case IPPROTO_ESP:
594 return SADB_SATYPE_ESP;
595 case IPPROTO_COMP:
596 return SADB_X_SATYPE_IPCOMP;
597 default:
598 return 0;
599 }
600 /* NOTREACHED */
601 }
602
603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
604 * say specifically 'just raw sockets' as we encode them as 255.
605 */
606
607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
608 {
609 return proto == IPSEC_PROTO_ANY ? 0 : proto;
610 }
611
612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
613 {
614 return proto ? proto : IPSEC_PROTO_ANY;
615 }
616
617 static inline int pfkey_sockaddr_len(sa_family_t family)
618 {
619 switch (family) {
620 case AF_INET:
621 return sizeof(struct sockaddr_in);
622 #if IS_ENABLED(CONFIG_IPV6)
623 case AF_INET6:
624 return sizeof(struct sockaddr_in6);
625 #endif
626 }
627 return 0;
628 }
629
630 static
631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
632 {
633 switch (sa->sa_family) {
634 case AF_INET:
635 xaddr->a4 =
636 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
637 return AF_INET;
638 #if IS_ENABLED(CONFIG_IPV6)
639 case AF_INET6:
640 memcpy(xaddr->a6,
641 &((struct sockaddr_in6 *)sa)->sin6_addr,
642 sizeof(struct in6_addr));
643 return AF_INET6;
644 #endif
645 }
646 return 0;
647 }
648
649 static
650 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
651 {
652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
653 xaddr);
654 }
655
656 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
657 {
658 const struct sadb_sa *sa;
659 const struct sadb_address *addr;
660 uint16_t proto;
661 unsigned short family;
662 xfrm_address_t *xaddr;
663
664 sa = ext_hdrs[SADB_EXT_SA - 1];
665 if (sa == NULL)
666 return NULL;
667
668 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
669 if (proto == 0)
670 return NULL;
671
672 /* sadb_address_len should be checked by caller */
673 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
674 if (addr == NULL)
675 return NULL;
676
677 family = ((const struct sockaddr *)(addr + 1))->sa_family;
678 switch (family) {
679 case AF_INET:
680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
681 break;
682 #if IS_ENABLED(CONFIG_IPV6)
683 case AF_INET6:
684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
685 break;
686 #endif
687 default:
688 xaddr = NULL;
689 }
690
691 if (!xaddr)
692 return NULL;
693
694 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
695 }
696
697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
698
699 static int
700 pfkey_sockaddr_size(sa_family_t family)
701 {
702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
703 }
704
705 static inline int pfkey_mode_from_xfrm(int mode)
706 {
707 switch(mode) {
708 case XFRM_MODE_TRANSPORT:
709 return IPSEC_MODE_TRANSPORT;
710 case XFRM_MODE_TUNNEL:
711 return IPSEC_MODE_TUNNEL;
712 case XFRM_MODE_BEET:
713 return IPSEC_MODE_BEET;
714 default:
715 return -1;
716 }
717 }
718
719 static inline int pfkey_mode_to_xfrm(int mode)
720 {
721 switch(mode) {
722 case IPSEC_MODE_ANY: /*XXX*/
723 case IPSEC_MODE_TRANSPORT:
724 return XFRM_MODE_TRANSPORT;
725 case IPSEC_MODE_TUNNEL:
726 return XFRM_MODE_TUNNEL;
727 case IPSEC_MODE_BEET:
728 return XFRM_MODE_BEET;
729 default:
730 return -1;
731 }
732 }
733
734 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
735 struct sockaddr *sa,
736 unsigned short family)
737 {
738 switch (family) {
739 case AF_INET:
740 {
741 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
742 sin->sin_family = AF_INET;
743 sin->sin_port = port;
744 sin->sin_addr.s_addr = xaddr->a4;
745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
746 return 32;
747 }
748 #if IS_ENABLED(CONFIG_IPV6)
749 case AF_INET6:
750 {
751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
752 sin6->sin6_family = AF_INET6;
753 sin6->sin6_port = port;
754 sin6->sin6_flowinfo = 0;
755 sin6->sin6_addr = xaddr->in6;
756 sin6->sin6_scope_id = 0;
757 return 128;
758 }
759 #endif
760 }
761 return 0;
762 }
763
764 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
765 int add_keys, int hsc)
766 {
767 struct sk_buff *skb;
768 struct sadb_msg *hdr;
769 struct sadb_sa *sa;
770 struct sadb_lifetime *lifetime;
771 struct sadb_address *addr;
772 struct sadb_key *key;
773 struct sadb_x_sa2 *sa2;
774 struct sadb_x_sec_ctx *sec_ctx;
775 struct xfrm_sec_ctx *xfrm_ctx;
776 int ctx_size = 0;
777 int size;
778 int auth_key_size = 0;
779 int encrypt_key_size = 0;
780 int sockaddr_size;
781 struct xfrm_encap_tmpl *natt = NULL;
782 int mode;
783
784 /* address family check */
785 sockaddr_size = pfkey_sockaddr_size(x->props.family);
786 if (!sockaddr_size)
787 return ERR_PTR(-EINVAL);
788
789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
790 key(AE), (identity(SD),) (sensitivity)> */
791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
792 sizeof(struct sadb_lifetime) +
793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
795 sizeof(struct sadb_address)*2 +
796 sockaddr_size*2 +
797 sizeof(struct sadb_x_sa2);
798
799 if ((xfrm_ctx = x->security)) {
800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
802 }
803
804 /* identity & sensitivity */
805 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
806 size += sizeof(struct sadb_address) + sockaddr_size;
807
808 if (add_keys) {
809 if (x->aalg && x->aalg->alg_key_len) {
810 auth_key_size =
811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
812 size += sizeof(struct sadb_key) + auth_key_size;
813 }
814 if (x->ealg && x->ealg->alg_key_len) {
815 encrypt_key_size =
816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
817 size += sizeof(struct sadb_key) + encrypt_key_size;
818 }
819 }
820 if (x->encap)
821 natt = x->encap;
822
823 if (natt && natt->encap_type) {
824 size += sizeof(struct sadb_x_nat_t_type);
825 size += sizeof(struct sadb_x_nat_t_port);
826 size += sizeof(struct sadb_x_nat_t_port);
827 }
828
829 skb = alloc_skb(size + 16, GFP_ATOMIC);
830 if (skb == NULL)
831 return ERR_PTR(-ENOBUFS);
832
833 /* call should fill header later */
834 hdr = skb_put(skb, sizeof(struct sadb_msg));
835 memset(hdr, 0, size); /* XXX do we need this ? */
836 hdr->sadb_msg_len = size / sizeof(uint64_t);
837
838 /* sa */
839 sa = skb_put(skb, sizeof(struct sadb_sa));
840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
841 sa->sadb_sa_exttype = SADB_EXT_SA;
842 sa->sadb_sa_spi = x->id.spi;
843 sa->sadb_sa_replay = x->props.replay_window;
844 switch (x->km.state) {
845 case XFRM_STATE_VALID:
846 sa->sadb_sa_state = x->km.dying ?
847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
848 break;
849 case XFRM_STATE_ACQ:
850 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
851 break;
852 default:
853 sa->sadb_sa_state = SADB_SASTATE_DEAD;
854 break;
855 }
856 sa->sadb_sa_auth = 0;
857 if (x->aalg) {
858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
859 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
860 a->desc.sadb_alg_id : 0;
861 }
862 sa->sadb_sa_encrypt = 0;
863 BUG_ON(x->ealg && x->calg);
864 if (x->ealg) {
865 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
866 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
867 a->desc.sadb_alg_id : 0;
868 }
869 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
870 if (x->calg) {
871 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
872 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
873 a->desc.sadb_alg_id : 0;
874 }
875
876 sa->sadb_sa_flags = 0;
877 if (x->props.flags & XFRM_STATE_NOECN)
878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
879 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
880 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
881 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
883
884 /* hard time */
885 if (hsc & 2) {
886 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
887 lifetime->sadb_lifetime_len =
888 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
889 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
890 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
891 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
892 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
893 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
894 }
895 /* soft time */
896 if (hsc & 1) {
897 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
898 lifetime->sadb_lifetime_len =
899 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
900 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
901 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
902 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
903 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
904 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
905 }
906 /* current time */
907 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
908 lifetime->sadb_lifetime_len =
909 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
911 lifetime->sadb_lifetime_allocations = x->curlft.packets;
912 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
913 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
914 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
915 /* src address */
916 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
917 addr->sadb_address_len =
918 (sizeof(struct sadb_address)+sockaddr_size)/
919 sizeof(uint64_t);
920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
921 /* "if the ports are non-zero, then the sadb_address_proto field,
922 normally zero, MUST be filled in with the transport
923 protocol's number." - RFC2367 */
924 addr->sadb_address_proto = 0;
925 addr->sadb_address_reserved = 0;
926
927 addr->sadb_address_prefixlen =
928 pfkey_sockaddr_fill(&x->props.saddr, 0,
929 (struct sockaddr *) (addr + 1),
930 x->props.family);
931 if (!addr->sadb_address_prefixlen)
932 BUG();
933
934 /* dst address */
935 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
936 addr->sadb_address_len =
937 (sizeof(struct sadb_address)+sockaddr_size)/
938 sizeof(uint64_t);
939 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
940 addr->sadb_address_proto = 0;
941 addr->sadb_address_reserved = 0;
942
943 addr->sadb_address_prefixlen =
944 pfkey_sockaddr_fill(&x->id.daddr, 0,
945 (struct sockaddr *) (addr + 1),
946 x->props.family);
947 if (!addr->sadb_address_prefixlen)
948 BUG();
949
950 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
951 x->props.family)) {
952 addr = skb_put(skb,
953 sizeof(struct sadb_address) + sockaddr_size);
954 addr->sadb_address_len =
955 (sizeof(struct sadb_address)+sockaddr_size)/
956 sizeof(uint64_t);
957 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
958 addr->sadb_address_proto =
959 pfkey_proto_from_xfrm(x->sel.proto);
960 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
961 addr->sadb_address_reserved = 0;
962
963 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
964 (struct sockaddr *) (addr + 1),
965 x->props.family);
966 }
967
968 /* auth key */
969 if (add_keys && auth_key_size) {
970 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
971 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
972 sizeof(uint64_t);
973 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
974 key->sadb_key_bits = x->aalg->alg_key_len;
975 key->sadb_key_reserved = 0;
976 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
977 }
978 /* encrypt key */
979 if (add_keys && encrypt_key_size) {
980 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
981 key->sadb_key_len = (sizeof(struct sadb_key) +
982 encrypt_key_size) / sizeof(uint64_t);
983 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
984 key->sadb_key_bits = x->ealg->alg_key_len;
985 key->sadb_key_reserved = 0;
986 memcpy(key + 1, x->ealg->alg_key,
987 (x->ealg->alg_key_len+7)/8);
988 }
989
990 /* sa */
991 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
992 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
993 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
994 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
995 kfree_skb(skb);
996 return ERR_PTR(-EINVAL);
997 }
998 sa2->sadb_x_sa2_mode = mode;
999 sa2->sadb_x_sa2_reserved1 = 0;
1000 sa2->sadb_x_sa2_reserved2 = 0;
1001 sa2->sadb_x_sa2_sequence = 0;
1002 sa2->sadb_x_sa2_reqid = x->props.reqid;
1003
1004 if (natt && natt->encap_type) {
1005 struct sadb_x_nat_t_type *n_type;
1006 struct sadb_x_nat_t_port *n_port;
1007
1008 /* type */
1009 n_type = skb_put(skb, sizeof(*n_type));
1010 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1011 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1012 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1013 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1014 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1015 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1016
1017 /* source port */
1018 n_port = skb_put(skb, sizeof(*n_port));
1019 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1020 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1021 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1022 n_port->sadb_x_nat_t_port_reserved = 0;
1023
1024 /* dest port */
1025 n_port = skb_put(skb, sizeof(*n_port));
1026 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1027 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1028 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1029 n_port->sadb_x_nat_t_port_reserved = 0;
1030 }
1031
1032 /* security context */
1033 if (xfrm_ctx) {
1034 sec_ctx = skb_put(skb,
1035 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1036 sec_ctx->sadb_x_sec_len =
1037 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1038 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1039 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1040 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1041 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1042 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1043 xfrm_ctx->ctx_len);
1044 }
1045
1046 return skb;
1047 }
1048
1049
1050 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1051 {
1052 struct sk_buff *skb;
1053
1054 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1055
1056 return skb;
1057 }
1058
1059 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1060 int hsc)
1061 {
1062 return __pfkey_xfrm_state2msg(x, 0, hsc);
1063 }
1064
1065 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1066 const struct sadb_msg *hdr,
1067 void * const *ext_hdrs)
1068 {
1069 struct xfrm_state *x;
1070 const struct sadb_lifetime *lifetime;
1071 const struct sadb_sa *sa;
1072 const struct sadb_key *key;
1073 const struct sadb_x_sec_ctx *sec_ctx;
1074 uint16_t proto;
1075 int err;
1076
1077
1078 sa = ext_hdrs[SADB_EXT_SA - 1];
1079 if (!sa ||
1080 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1081 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1082 return ERR_PTR(-EINVAL);
1083 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1084 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1085 return ERR_PTR(-EINVAL);
1086 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1087 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1088 return ERR_PTR(-EINVAL);
1089 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1090 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1091 return ERR_PTR(-EINVAL);
1092
1093 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1094 if (proto == 0)
1095 return ERR_PTR(-EINVAL);
1096
1097 /* default error is no buffer space */
1098 err = -ENOBUFS;
1099
1100 /* RFC2367:
1101
1102 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1103 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1104 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1105 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1106 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1107 not true.
1108
1109 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1110 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1111 */
1112 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1113 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1114 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1115 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1116 return ERR_PTR(-EINVAL);
1117 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1118 if (key != NULL &&
1119 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1120 key->sadb_key_bits == 0)
1121 return ERR_PTR(-EINVAL);
1122 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1123 if (key != NULL &&
1124 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1125 key->sadb_key_bits == 0)
1126 return ERR_PTR(-EINVAL);
1127
1128 x = xfrm_state_alloc(net);
1129 if (x == NULL)
1130 return ERR_PTR(-ENOBUFS);
1131
1132 x->id.proto = proto;
1133 x->id.spi = sa->sadb_sa_spi;
1134 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1135 (sizeof(x->replay.bitmap) * 8));
1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1137 x->props.flags |= XFRM_STATE_NOECN;
1138 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1139 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1140 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1141 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1142
1143 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1144 if (lifetime != NULL) {
1145 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1146 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1147 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1148 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1149 }
1150 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1151 if (lifetime != NULL) {
1152 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1153 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1154 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1155 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1156 }
1157
1158 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1159 if (sec_ctx != NULL) {
1160 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1161
1162 if (!uctx)
1163 goto out;
1164
1165 err = security_xfrm_state_alloc(x, uctx);
1166 kfree(uctx);
1167
1168 if (err)
1169 goto out;
1170 }
1171
1172 err = -ENOBUFS;
1173 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1174 if (sa->sadb_sa_auth) {
1175 int keysize = 0;
1176 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1177 if (!a || !a->pfkey_supported) {
1178 err = -ENOSYS;
1179 goto out;
1180 }
1181 if (key)
1182 keysize = (key->sadb_key_bits + 7) / 8;
1183 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1184 if (!x->aalg) {
1185 err = -ENOMEM;
1186 goto out;
1187 }
1188 strcpy(x->aalg->alg_name, a->name);
1189 x->aalg->alg_key_len = 0;
1190 if (key) {
1191 x->aalg->alg_key_len = key->sadb_key_bits;
1192 memcpy(x->aalg->alg_key, key+1, keysize);
1193 }
1194 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1195 x->props.aalgo = sa->sadb_sa_auth;
1196 /* x->algo.flags = sa->sadb_sa_flags; */
1197 }
1198 if (sa->sadb_sa_encrypt) {
1199 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1200 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1201 if (!a || !a->pfkey_supported) {
1202 err = -ENOSYS;
1203 goto out;
1204 }
1205 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1206 if (!x->calg) {
1207 err = -ENOMEM;
1208 goto out;
1209 }
1210 strcpy(x->calg->alg_name, a->name);
1211 x->props.calgo = sa->sadb_sa_encrypt;
1212 } else {
1213 int keysize = 0;
1214 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1215 if (!a || !a->pfkey_supported) {
1216 err = -ENOSYS;
1217 goto out;
1218 }
1219 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1220 if (key)
1221 keysize = (key->sadb_key_bits + 7) / 8;
1222 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1223 if (!x->ealg) {
1224 err = -ENOMEM;
1225 goto out;
1226 }
1227 strcpy(x->ealg->alg_name, a->name);
1228 x->ealg->alg_key_len = 0;
1229 if (key) {
1230 x->ealg->alg_key_len = key->sadb_key_bits;
1231 memcpy(x->ealg->alg_key, key+1, keysize);
1232 }
1233 x->props.ealgo = sa->sadb_sa_encrypt;
1234 x->geniv = a->uinfo.encr.geniv;
1235 }
1236 }
1237 /* x->algo.flags = sa->sadb_sa_flags; */
1238
1239 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1240 &x->props.saddr);
1241 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1242 &x->id.daddr);
1243
1244 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1245 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1246 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1247 if (mode < 0) {
1248 err = -EINVAL;
1249 goto out;
1250 }
1251 x->props.mode = mode;
1252 x->props.reqid = sa2->sadb_x_sa2_reqid;
1253 }
1254
1255 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1256 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1257
1258 /* Nobody uses this, but we try. */
1259 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1260 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1261 }
1262
1263 if (!x->sel.family)
1264 x->sel.family = x->props.family;
1265
1266 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1267 const struct sadb_x_nat_t_type* n_type;
1268 struct xfrm_encap_tmpl *natt;
1269
1270 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1271 if (!x->encap) {
1272 err = -ENOMEM;
1273 goto out;
1274 }
1275
1276 natt = x->encap;
1277 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1278 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1279
1280 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1281 const struct sadb_x_nat_t_port *n_port =
1282 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1283 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1284 }
1285 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1286 const struct sadb_x_nat_t_port *n_port =
1287 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1288 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1289 }
1290 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1291 }
1292
1293 err = xfrm_init_state(x);
1294 if (err)
1295 goto out;
1296
1297 x->km.seq = hdr->sadb_msg_seq;
1298 return x;
1299
1300 out:
1301 x->km.state = XFRM_STATE_DEAD;
1302 xfrm_state_put(x);
1303 return ERR_PTR(err);
1304 }
1305
1306 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1307 {
1308 return -EOPNOTSUPP;
1309 }
1310
1311 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1312 {
1313 struct net *net = sock_net(sk);
1314 struct sk_buff *resp_skb;
1315 struct sadb_x_sa2 *sa2;
1316 struct sadb_address *saddr, *daddr;
1317 struct sadb_msg *out_hdr;
1318 struct sadb_spirange *range;
1319 struct xfrm_state *x = NULL;
1320 int mode;
1321 int err;
1322 u32 min_spi, max_spi;
1323 u32 reqid;
1324 u8 proto;
1325 unsigned short family;
1326 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1327
1328 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1329 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1330 return -EINVAL;
1331
1332 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1333 if (proto == 0)
1334 return -EINVAL;
1335
1336 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1337 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1338 if (mode < 0)
1339 return -EINVAL;
1340 reqid = sa2->sadb_x_sa2_reqid;
1341 } else {
1342 mode = 0;
1343 reqid = 0;
1344 }
1345
1346 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1347 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1348
1349 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1350 switch (family) {
1351 case AF_INET:
1352 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1353 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1354 break;
1355 #if IS_ENABLED(CONFIG_IPV6)
1356 case AF_INET6:
1357 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1358 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1359 break;
1360 #endif
1361 }
1362
1363 if (hdr->sadb_msg_seq) {
1364 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1365 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1366 xfrm_state_put(x);
1367 x = NULL;
1368 }
1369 }
1370
1371 if (!x)
1372 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1373
1374 if (x == NULL)
1375 return -ENOENT;
1376
1377 min_spi = 0x100;
1378 max_spi = 0x0fffffff;
1379
1380 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1381 if (range) {
1382 min_spi = range->sadb_spirange_min;
1383 max_spi = range->sadb_spirange_max;
1384 }
1385
1386 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1387 if (err) {
1388 xfrm_state_put(x);
1389 return err;
1390 }
1391
1392 err = xfrm_alloc_spi(x, min_spi, max_spi);
1393 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1394
1395 if (IS_ERR(resp_skb)) {
1396 xfrm_state_put(x);
1397 return PTR_ERR(resp_skb);
1398 }
1399
1400 out_hdr = (struct sadb_msg *) resp_skb->data;
1401 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1402 out_hdr->sadb_msg_type = SADB_GETSPI;
1403 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1404 out_hdr->sadb_msg_errno = 0;
1405 out_hdr->sadb_msg_reserved = 0;
1406 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1407 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1408
1409 xfrm_state_put(x);
1410
1411 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1412
1413 return 0;
1414 }
1415
1416 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1417 {
1418 struct net *net = sock_net(sk);
1419 struct xfrm_state *x;
1420
1421 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1422 return -EOPNOTSUPP;
1423
1424 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1425 return 0;
1426
1427 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1428 if (x == NULL)
1429 return 0;
1430
1431 spin_lock_bh(&x->lock);
1432 if (x->km.state == XFRM_STATE_ACQ)
1433 x->km.state = XFRM_STATE_ERROR;
1434
1435 spin_unlock_bh(&x->lock);
1436 xfrm_state_put(x);
1437 return 0;
1438 }
1439
1440 static inline int event2poltype(int event)
1441 {
1442 switch (event) {
1443 case XFRM_MSG_DELPOLICY:
1444 return SADB_X_SPDDELETE;
1445 case XFRM_MSG_NEWPOLICY:
1446 return SADB_X_SPDADD;
1447 case XFRM_MSG_UPDPOLICY:
1448 return SADB_X_SPDUPDATE;
1449 case XFRM_MSG_POLEXPIRE:
1450 // return SADB_X_SPDEXPIRE;
1451 default:
1452 pr_err("pfkey: Unknown policy event %d\n", event);
1453 break;
1454 }
1455
1456 return 0;
1457 }
1458
1459 static inline int event2keytype(int event)
1460 {
1461 switch (event) {
1462 case XFRM_MSG_DELSA:
1463 return SADB_DELETE;
1464 case XFRM_MSG_NEWSA:
1465 return SADB_ADD;
1466 case XFRM_MSG_UPDSA:
1467 return SADB_UPDATE;
1468 case XFRM_MSG_EXPIRE:
1469 return SADB_EXPIRE;
1470 default:
1471 pr_err("pfkey: Unknown SA event %d\n", event);
1472 break;
1473 }
1474
1475 return 0;
1476 }
1477
1478 /* ADD/UPD/DEL */
1479 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1480 {
1481 struct sk_buff *skb;
1482 struct sadb_msg *hdr;
1483
1484 skb = pfkey_xfrm_state2msg(x);
1485
1486 if (IS_ERR(skb))
1487 return PTR_ERR(skb);
1488
1489 hdr = (struct sadb_msg *) skb->data;
1490 hdr->sadb_msg_version = PF_KEY_V2;
1491 hdr->sadb_msg_type = event2keytype(c->event);
1492 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1493 hdr->sadb_msg_errno = 0;
1494 hdr->sadb_msg_reserved = 0;
1495 hdr->sadb_msg_seq = c->seq;
1496 hdr->sadb_msg_pid = c->portid;
1497
1498 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1499
1500 return 0;
1501 }
1502
1503 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1504 {
1505 struct net *net = sock_net(sk);
1506 struct xfrm_state *x;
1507 int err;
1508 struct km_event c;
1509
1510 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1511 if (IS_ERR(x))
1512 return PTR_ERR(x);
1513
1514 xfrm_state_hold(x);
1515 if (hdr->sadb_msg_type == SADB_ADD)
1516 err = xfrm_state_add(x);
1517 else
1518 err = xfrm_state_update(x);
1519
1520 xfrm_audit_state_add(x, err ? 0 : 1, true);
1521
1522 if (err < 0) {
1523 x->km.state = XFRM_STATE_DEAD;
1524 __xfrm_state_put(x);
1525 goto out;
1526 }
1527
1528 if (hdr->sadb_msg_type == SADB_ADD)
1529 c.event = XFRM_MSG_NEWSA;
1530 else
1531 c.event = XFRM_MSG_UPDSA;
1532 c.seq = hdr->sadb_msg_seq;
1533 c.portid = hdr->sadb_msg_pid;
1534 km_state_notify(x, &c);
1535 out:
1536 xfrm_state_put(x);
1537 return err;
1538 }
1539
1540 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1541 {
1542 struct net *net = sock_net(sk);
1543 struct xfrm_state *x;
1544 struct km_event c;
1545 int err;
1546
1547 if (!ext_hdrs[SADB_EXT_SA-1] ||
1548 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550 return -EINVAL;
1551
1552 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553 if (x == NULL)
1554 return -ESRCH;
1555
1556 if ((err = security_xfrm_state_delete(x)))
1557 goto out;
1558
1559 if (xfrm_state_kern(x)) {
1560 err = -EPERM;
1561 goto out;
1562 }
1563
1564 err = xfrm_state_delete(x);
1565
1566 if (err < 0)
1567 goto out;
1568
1569 c.seq = hdr->sadb_msg_seq;
1570 c.portid = hdr->sadb_msg_pid;
1571 c.event = XFRM_MSG_DELSA;
1572 km_state_notify(x, &c);
1573 out:
1574 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1575 xfrm_state_put(x);
1576
1577 return err;
1578 }
1579
1580 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1581 {
1582 struct net *net = sock_net(sk);
1583 __u8 proto;
1584 struct sk_buff *out_skb;
1585 struct sadb_msg *out_hdr;
1586 struct xfrm_state *x;
1587
1588 if (!ext_hdrs[SADB_EXT_SA-1] ||
1589 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1590 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1591 return -EINVAL;
1592
1593 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1594 if (x == NULL)
1595 return -ESRCH;
1596
1597 out_skb = pfkey_xfrm_state2msg(x);
1598 proto = x->id.proto;
1599 xfrm_state_put(x);
1600 if (IS_ERR(out_skb))
1601 return PTR_ERR(out_skb);
1602
1603 out_hdr = (struct sadb_msg *) out_skb->data;
1604 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1605 out_hdr->sadb_msg_type = SADB_GET;
1606 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1607 out_hdr->sadb_msg_errno = 0;
1608 out_hdr->sadb_msg_reserved = 0;
1609 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1610 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1611 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1612
1613 return 0;
1614 }
1615
1616 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1617 gfp_t allocation)
1618 {
1619 struct sk_buff *skb;
1620 struct sadb_msg *hdr;
1621 int len, auth_len, enc_len, i;
1622
1623 auth_len = xfrm_count_pfkey_auth_supported();
1624 if (auth_len) {
1625 auth_len *= sizeof(struct sadb_alg);
1626 auth_len += sizeof(struct sadb_supported);
1627 }
1628
1629 enc_len = xfrm_count_pfkey_enc_supported();
1630 if (enc_len) {
1631 enc_len *= sizeof(struct sadb_alg);
1632 enc_len += sizeof(struct sadb_supported);
1633 }
1634
1635 len = enc_len + auth_len + sizeof(struct sadb_msg);
1636
1637 skb = alloc_skb(len + 16, allocation);
1638 if (!skb)
1639 goto out_put_algs;
1640
1641 hdr = skb_put(skb, sizeof(*hdr));
1642 pfkey_hdr_dup(hdr, orig);
1643 hdr->sadb_msg_errno = 0;
1644 hdr->sadb_msg_len = len / sizeof(uint64_t);
1645
1646 if (auth_len) {
1647 struct sadb_supported *sp;
1648 struct sadb_alg *ap;
1649
1650 sp = skb_put(skb, auth_len);
1651 ap = (struct sadb_alg *) (sp + 1);
1652
1653 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1654 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1655
1656 for (i = 0; ; i++) {
1657 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1658 if (!aalg)
1659 break;
1660 if (!aalg->pfkey_supported)
1661 continue;
1662 if (aalg->available)
1663 *ap++ = aalg->desc;
1664 }
1665 }
1666
1667 if (enc_len) {
1668 struct sadb_supported *sp;
1669 struct sadb_alg *ap;
1670
1671 sp = skb_put(skb, enc_len);
1672 ap = (struct sadb_alg *) (sp + 1);
1673
1674 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1675 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1676
1677 for (i = 0; ; i++) {
1678 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1679 if (!ealg)
1680 break;
1681 if (!ealg->pfkey_supported)
1682 continue;
1683 if (ealg->available)
1684 *ap++ = ealg->desc;
1685 }
1686 }
1687
1688 out_put_algs:
1689 return skb;
1690 }
1691
1692 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1693 {
1694 struct pfkey_sock *pfk = pfkey_sk(sk);
1695 struct sk_buff *supp_skb;
1696
1697 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1698 return -EINVAL;
1699
1700 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1701 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1702 return -EEXIST;
1703 pfk->registered |= (1<<hdr->sadb_msg_satype);
1704 }
1705
1706 xfrm_probe_algs();
1707
1708 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1709 if (!supp_skb) {
1710 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1711 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1712
1713 return -ENOBUFS;
1714 }
1715
1716 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1717 sock_net(sk));
1718 return 0;
1719 }
1720
1721 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1722 {
1723 struct sk_buff *skb;
1724 struct sadb_msg *hdr;
1725
1726 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1727 if (!skb)
1728 return -ENOBUFS;
1729
1730 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1731 hdr->sadb_msg_errno = (uint8_t) 0;
1732 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1733
1734 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1735 sock_net(sk));
1736 }
1737
1738 static int key_notify_sa_flush(const struct km_event *c)
1739 {
1740 struct sk_buff *skb;
1741 struct sadb_msg *hdr;
1742
1743 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1744 if (!skb)
1745 return -ENOBUFS;
1746 hdr = skb_put(skb, sizeof(struct sadb_msg));
1747 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1748 hdr->sadb_msg_type = SADB_FLUSH;
1749 hdr->sadb_msg_seq = c->seq;
1750 hdr->sadb_msg_pid = c->portid;
1751 hdr->sadb_msg_version = PF_KEY_V2;
1752 hdr->sadb_msg_errno = (uint8_t) 0;
1753 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1754 hdr->sadb_msg_reserved = 0;
1755
1756 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1757
1758 return 0;
1759 }
1760
1761 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1762 {
1763 struct net *net = sock_net(sk);
1764 unsigned int proto;
1765 struct km_event c;
1766 int err, err2;
1767
1768 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1769 if (proto == 0)
1770 return -EINVAL;
1771
1772 err = xfrm_state_flush(net, proto, true, false);
1773 err2 = unicast_flush_resp(sk, hdr);
1774 if (err || err2) {
1775 if (err == -ESRCH) /* empty table - go quietly */
1776 err = 0;
1777 return err ? err : err2;
1778 }
1779
1780 c.data.proto = proto;
1781 c.seq = hdr->sadb_msg_seq;
1782 c.portid = hdr->sadb_msg_pid;
1783 c.event = XFRM_MSG_FLUSHSA;
1784 c.net = net;
1785 km_state_notify(NULL, &c);
1786
1787 return 0;
1788 }
1789
1790 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1791 {
1792 struct pfkey_sock *pfk = ptr;
1793 struct sk_buff *out_skb;
1794 struct sadb_msg *out_hdr;
1795
1796 if (!pfkey_can_dump(&pfk->sk))
1797 return -ENOBUFS;
1798
1799 out_skb = pfkey_xfrm_state2msg(x);
1800 if (IS_ERR(out_skb))
1801 return PTR_ERR(out_skb);
1802
1803 out_hdr = (struct sadb_msg *) out_skb->data;
1804 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1805 out_hdr->sadb_msg_type = SADB_DUMP;
1806 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1807 out_hdr->sadb_msg_errno = 0;
1808 out_hdr->sadb_msg_reserved = 0;
1809 out_hdr->sadb_msg_seq = count + 1;
1810 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1811
1812 if (pfk->dump.skb)
1813 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1814 &pfk->sk, sock_net(&pfk->sk));
1815 pfk->dump.skb = out_skb;
1816
1817 return 0;
1818 }
1819
1820 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1821 {
1822 struct net *net = sock_net(&pfk->sk);
1823 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1824 }
1825
1826 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1827 {
1828 struct net *net = sock_net(&pfk->sk);
1829
1830 xfrm_state_walk_done(&pfk->dump.u.state, net);
1831 }
1832
1833 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1834 {
1835 u8 proto;
1836 struct xfrm_address_filter *filter = NULL;
1837 struct pfkey_sock *pfk = pfkey_sk(sk);
1838
1839 mutex_lock(&pfk->dump_lock);
1840 if (pfk->dump.dump != NULL) {
1841 mutex_unlock(&pfk->dump_lock);
1842 return -EBUSY;
1843 }
1844
1845 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1846 if (proto == 0) {
1847 mutex_unlock(&pfk->dump_lock);
1848 return -EINVAL;
1849 }
1850
1851 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1852 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1853
1854 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1855 if (filter == NULL) {
1856 mutex_unlock(&pfk->dump_lock);
1857 return -ENOMEM;
1858 }
1859
1860 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1861 sizeof(xfrm_address_t));
1862 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1863 sizeof(xfrm_address_t));
1864 filter->family = xfilter->sadb_x_filter_family;
1865 filter->splen = xfilter->sadb_x_filter_splen;
1866 filter->dplen = xfilter->sadb_x_filter_dplen;
1867 }
1868
1869 pfk->dump.msg_version = hdr->sadb_msg_version;
1870 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1871 pfk->dump.dump = pfkey_dump_sa;
1872 pfk->dump.done = pfkey_dump_sa_done;
1873 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1874 mutex_unlock(&pfk->dump_lock);
1875
1876 return pfkey_do_dump(pfk);
1877 }
1878
1879 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1880 {
1881 struct pfkey_sock *pfk = pfkey_sk(sk);
1882 int satype = hdr->sadb_msg_satype;
1883 bool reset_errno = false;
1884
1885 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1886 reset_errno = true;
1887 if (satype != 0 && satype != 1)
1888 return -EINVAL;
1889 pfk->promisc = satype;
1890 }
1891 if (reset_errno && skb_cloned(skb))
1892 skb = skb_copy(skb, GFP_KERNEL);
1893 else
1894 skb = skb_clone(skb, GFP_KERNEL);
1895
1896 if (reset_errno && skb) {
1897 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1898 new_hdr->sadb_msg_errno = 0;
1899 }
1900
1901 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1902 return 0;
1903 }
1904
1905 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1906 {
1907 int i;
1908 u32 reqid = *(u32*)ptr;
1909
1910 for (i=0; i<xp->xfrm_nr; i++) {
1911 if (xp->xfrm_vec[i].reqid == reqid)
1912 return -EEXIST;
1913 }
1914 return 0;
1915 }
1916
1917 static u32 gen_reqid(struct net *net)
1918 {
1919 struct xfrm_policy_walk walk;
1920 u32 start;
1921 int rc;
1922 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1923
1924 start = reqid;
1925 do {
1926 ++reqid;
1927 if (reqid == 0)
1928 reqid = IPSEC_MANUAL_REQID_MAX+1;
1929 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1930 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1931 xfrm_policy_walk_done(&walk, net);
1932 if (rc != -EEXIST)
1933 return reqid;
1934 } while (reqid != start);
1935 return 0;
1936 }
1937
1938 static int
1939 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1940 {
1941 struct net *net = xp_net(xp);
1942 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1943 int mode;
1944
1945 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1946 return -ELOOP;
1947
1948 if (rq->sadb_x_ipsecrequest_mode == 0)
1949 return -EINVAL;
1950 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1951 return -EINVAL;
1952
1953 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1954 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1955 return -EINVAL;
1956 t->mode = mode;
1957 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1958 t->optional = 1;
1959 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1960 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1961 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1962 t->reqid = 0;
1963 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1964 return -ENOBUFS;
1965 }
1966
1967 /* addresses present only in tunnel mode */
1968 if (t->mode == XFRM_MODE_TUNNEL) {
1969 int err;
1970
1971 err = parse_sockaddr_pair(
1972 (struct sockaddr *)(rq + 1),
1973 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1974 &t->saddr, &t->id.daddr, &t->encap_family);
1975 if (err)
1976 return err;
1977 } else
1978 t->encap_family = xp->family;
1979
1980 /* No way to set this via kame pfkey */
1981 t->allalgs = 1;
1982 xp->xfrm_nr++;
1983 return 0;
1984 }
1985
1986 static int
1987 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1988 {
1989 int err;
1990 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1991 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1992
1993 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1994 return -EINVAL;
1995
1996 while (len >= sizeof(*rq)) {
1997 if (len < rq->sadb_x_ipsecrequest_len ||
1998 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1999 return -EINVAL;
2000
2001 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2002 return err;
2003 len -= rq->sadb_x_ipsecrequest_len;
2004 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2005 }
2006 return 0;
2007 }
2008
2009 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2010 {
2011 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2012
2013 if (xfrm_ctx) {
2014 int len = sizeof(struct sadb_x_sec_ctx);
2015 len += xfrm_ctx->ctx_len;
2016 return PFKEY_ALIGN8(len);
2017 }
2018 return 0;
2019 }
2020
2021 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2022 {
2023 const struct xfrm_tmpl *t;
2024 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2025 int socklen = 0;
2026 int i;
2027
2028 for (i=0; i<xp->xfrm_nr; i++) {
2029 t = xp->xfrm_vec + i;
2030 socklen += pfkey_sockaddr_len(t->encap_family);
2031 }
2032
2033 return sizeof(struct sadb_msg) +
2034 (sizeof(struct sadb_lifetime) * 3) +
2035 (sizeof(struct sadb_address) * 2) +
2036 (sockaddr_size * 2) +
2037 sizeof(struct sadb_x_policy) +
2038 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2039 (socklen * 2) +
2040 pfkey_xfrm_policy2sec_ctx_size(xp);
2041 }
2042
2043 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2044 {
2045 struct sk_buff *skb;
2046 int size;
2047
2048 size = pfkey_xfrm_policy2msg_size(xp);
2049
2050 skb = alloc_skb(size + 16, GFP_ATOMIC);
2051 if (skb == NULL)
2052 return ERR_PTR(-ENOBUFS);
2053
2054 return skb;
2055 }
2056
2057 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2058 {
2059 struct sadb_msg *hdr;
2060 struct sadb_address *addr;
2061 struct sadb_lifetime *lifetime;
2062 struct sadb_x_policy *pol;
2063 struct sadb_x_sec_ctx *sec_ctx;
2064 struct xfrm_sec_ctx *xfrm_ctx;
2065 int i;
2066 int size;
2067 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2068 int socklen = pfkey_sockaddr_len(xp->family);
2069
2070 size = pfkey_xfrm_policy2msg_size(xp);
2071
2072 /* call should fill header later */
2073 hdr = skb_put(skb, sizeof(struct sadb_msg));
2074 memset(hdr, 0, size); /* XXX do we need this ? */
2075
2076 /* src address */
2077 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2078 addr->sadb_address_len =
2079 (sizeof(struct sadb_address)+sockaddr_size)/
2080 sizeof(uint64_t);
2081 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2082 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2083 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2084 addr->sadb_address_reserved = 0;
2085 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2086 xp->selector.sport,
2087 (struct sockaddr *) (addr + 1),
2088 xp->family))
2089 BUG();
2090
2091 /* dst address */
2092 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2093 addr->sadb_address_len =
2094 (sizeof(struct sadb_address)+sockaddr_size)/
2095 sizeof(uint64_t);
2096 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2097 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2098 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2099 addr->sadb_address_reserved = 0;
2100
2101 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2102 (struct sockaddr *) (addr + 1),
2103 xp->family);
2104
2105 /* hard time */
2106 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2107 lifetime->sadb_lifetime_len =
2108 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2109 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2110 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2111 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2112 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2113 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2114 /* soft time */
2115 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2116 lifetime->sadb_lifetime_len =
2117 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2118 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2119 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2120 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2121 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2122 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2123 /* current time */
2124 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2125 lifetime->sadb_lifetime_len =
2126 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2127 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2128 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2129 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2130 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2131 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2132
2133 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2134 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2135 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2136 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2137 if (xp->action == XFRM_POLICY_ALLOW) {
2138 if (xp->xfrm_nr)
2139 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2140 else
2141 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2142 }
2143 pol->sadb_x_policy_dir = dir+1;
2144 pol->sadb_x_policy_reserved = 0;
2145 pol->sadb_x_policy_id = xp->index;
2146 pol->sadb_x_policy_priority = xp->priority;
2147
2148 for (i=0; i<xp->xfrm_nr; i++) {
2149 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2150 struct sadb_x_ipsecrequest *rq;
2151 int req_size;
2152 int mode;
2153
2154 req_size = sizeof(struct sadb_x_ipsecrequest);
2155 if (t->mode == XFRM_MODE_TUNNEL) {
2156 socklen = pfkey_sockaddr_len(t->encap_family);
2157 req_size += socklen * 2;
2158 } else {
2159 size -= 2*socklen;
2160 }
2161 rq = skb_put(skb, req_size);
2162 pol->sadb_x_policy_len += req_size/8;
2163 memset(rq, 0, sizeof(*rq));
2164 rq->sadb_x_ipsecrequest_len = req_size;
2165 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2166 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2167 return -EINVAL;
2168 rq->sadb_x_ipsecrequest_mode = mode;
2169 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2170 if (t->reqid)
2171 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2172 if (t->optional)
2173 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2174 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2175
2176 if (t->mode == XFRM_MODE_TUNNEL) {
2177 u8 *sa = (void *)(rq + 1);
2178 pfkey_sockaddr_fill(&t->saddr, 0,
2179 (struct sockaddr *)sa,
2180 t->encap_family);
2181 pfkey_sockaddr_fill(&t->id.daddr, 0,
2182 (struct sockaddr *) (sa + socklen),
2183 t->encap_family);
2184 }
2185 }
2186
2187 /* security context */
2188 if ((xfrm_ctx = xp->security)) {
2189 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2190
2191 sec_ctx = skb_put(skb, ctx_size);
2192 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2193 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2194 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2195 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2196 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2197 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2198 xfrm_ctx->ctx_len);
2199 }
2200
2201 hdr->sadb_msg_len = size / sizeof(uint64_t);
2202 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2203
2204 return 0;
2205 }
2206
2207 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2208 {
2209 struct sk_buff *out_skb;
2210 struct sadb_msg *out_hdr;
2211 int err;
2212
2213 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2214 if (IS_ERR(out_skb))
2215 return PTR_ERR(out_skb);
2216
2217 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2218 if (err < 0) {
2219 kfree_skb(out_skb);
2220 return err;
2221 }
2222
2223 out_hdr = (struct sadb_msg *) out_skb->data;
2224 out_hdr->sadb_msg_version = PF_KEY_V2;
2225
2226 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2227 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2228 else
2229 out_hdr->sadb_msg_type = event2poltype(c->event);
2230 out_hdr->sadb_msg_errno = 0;
2231 out_hdr->sadb_msg_seq = c->seq;
2232 out_hdr->sadb_msg_pid = c->portid;
2233 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2234 return 0;
2235
2236 }
2237
2238 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2239 {
2240 struct net *net = sock_net(sk);
2241 int err = 0;
2242 struct sadb_lifetime *lifetime;
2243 struct sadb_address *sa;
2244 struct sadb_x_policy *pol;
2245 struct xfrm_policy *xp;
2246 struct km_event c;
2247 struct sadb_x_sec_ctx *sec_ctx;
2248
2249 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2250 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2251 !ext_hdrs[SADB_X_EXT_POLICY-1])
2252 return -EINVAL;
2253
2254 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2255 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2256 return -EINVAL;
2257 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2258 return -EINVAL;
2259
2260 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2261 if (xp == NULL)
2262 return -ENOBUFS;
2263
2264 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2265 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2266 xp->priority = pol->sadb_x_policy_priority;
2267
2268 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2269 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2270 xp->selector.family = xp->family;
2271 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2272 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2273 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2274 if (xp->selector.sport)
2275 xp->selector.sport_mask = htons(0xffff);
2276
2277 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2278 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2279 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2280
2281 /* Amusing, we set this twice. KAME apps appear to set same value
2282 * in both addresses.
2283 */
2284 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2285
2286 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2287 if (xp->selector.dport)
2288 xp->selector.dport_mask = htons(0xffff);
2289
2290 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2291 if (sec_ctx != NULL) {
2292 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2293
2294 if (!uctx) {
2295 err = -ENOBUFS;
2296 goto out;
2297 }
2298
2299 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2300 kfree(uctx);
2301
2302 if (err)
2303 goto out;
2304 }
2305
2306 xp->lft.soft_byte_limit = XFRM_INF;
2307 xp->lft.hard_byte_limit = XFRM_INF;
2308 xp->lft.soft_packet_limit = XFRM_INF;
2309 xp->lft.hard_packet_limit = XFRM_INF;
2310 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2311 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2312 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2313 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2314 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2315 }
2316 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2317 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2318 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2319 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2320 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2321 }
2322 xp->xfrm_nr = 0;
2323 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2324 (err = parse_ipsecrequests(xp, pol)) < 0)
2325 goto out;
2326
2327 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2328 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2329
2330 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2331
2332 if (err)
2333 goto out;
2334
2335 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2336 c.event = XFRM_MSG_UPDPOLICY;
2337 else
2338 c.event = XFRM_MSG_NEWPOLICY;
2339
2340 c.seq = hdr->sadb_msg_seq;
2341 c.portid = hdr->sadb_msg_pid;
2342
2343 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2344 xfrm_pol_put(xp);
2345 return 0;
2346
2347 out:
2348 xp->walk.dead = 1;
2349 xfrm_policy_destroy(xp);
2350 return err;
2351 }
2352
2353 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2354 {
2355 struct net *net = sock_net(sk);
2356 int err;
2357 struct sadb_address *sa;
2358 struct sadb_x_policy *pol;
2359 struct xfrm_policy *xp;
2360 struct xfrm_selector sel;
2361 struct km_event c;
2362 struct sadb_x_sec_ctx *sec_ctx;
2363 struct xfrm_sec_ctx *pol_ctx = NULL;
2364
2365 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2366 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2367 !ext_hdrs[SADB_X_EXT_POLICY-1])
2368 return -EINVAL;
2369
2370 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2371 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2372 return -EINVAL;
2373
2374 memset(&sel, 0, sizeof(sel));
2375
2376 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2377 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2378 sel.prefixlen_s = sa->sadb_address_prefixlen;
2379 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2380 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2381 if (sel.sport)
2382 sel.sport_mask = htons(0xffff);
2383
2384 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2385 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2386 sel.prefixlen_d = sa->sadb_address_prefixlen;
2387 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2388 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2389 if (sel.dport)
2390 sel.dport_mask = htons(0xffff);
2391
2392 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2393 if (sec_ctx != NULL) {
2394 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2395
2396 if (!uctx)
2397 return -ENOMEM;
2398
2399 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2400 kfree(uctx);
2401 if (err)
2402 return err;
2403 }
2404
2405 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2406 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2407 1, &err);
2408 security_xfrm_policy_free(pol_ctx);
2409 if (xp == NULL)
2410 return -ENOENT;
2411
2412 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2413
2414 if (err)
2415 goto out;
2416
2417 c.seq = hdr->sadb_msg_seq;
2418 c.portid = hdr->sadb_msg_pid;
2419 c.data.byid = 0;
2420 c.event = XFRM_MSG_DELPOLICY;
2421 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2422
2423 out:
2424 xfrm_pol_put(xp);
2425 return err;
2426 }
2427
2428 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2429 {
2430 int err;
2431 struct sk_buff *out_skb;
2432 struct sadb_msg *out_hdr;
2433 err = 0;
2434
2435 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2436 if (IS_ERR(out_skb)) {
2437 err = PTR_ERR(out_skb);
2438 goto out;
2439 }
2440 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2441 if (err < 0)
2442 goto out;
2443
2444 out_hdr = (struct sadb_msg *) out_skb->data;
2445 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2446 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2447 out_hdr->sadb_msg_satype = 0;
2448 out_hdr->sadb_msg_errno = 0;
2449 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2450 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2451 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2452 err = 0;
2453
2454 out:
2455 return err;
2456 }
2457
2458 static int pfkey_sockaddr_pair_size(sa_family_t family)
2459 {
2460 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2461 }
2462
2463 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2464 xfrm_address_t *saddr, xfrm_address_t *daddr,
2465 u16 *family)
2466 {
2467 int af, socklen;
2468
2469 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2470 return -EINVAL;
2471
2472 af = pfkey_sockaddr_extract(sa, saddr);
2473 if (!af)
2474 return -EINVAL;
2475
2476 socklen = pfkey_sockaddr_len(af);
2477 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2478 daddr) != af)
2479 return -EINVAL;
2480
2481 *family = af;
2482 return 0;
2483 }
2484
2485 #ifdef CONFIG_NET_KEY_MIGRATE
2486 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2487 struct xfrm_migrate *m)
2488 {
2489 int err;
2490 struct sadb_x_ipsecrequest *rq2;
2491 int mode;
2492
2493 if (len < sizeof(*rq1) ||
2494 len < rq1->sadb_x_ipsecrequest_len ||
2495 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2496 return -EINVAL;
2497
2498 /* old endoints */
2499 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2500 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2501 &m->old_saddr, &m->old_daddr,
2502 &m->old_family);
2503 if (err)
2504 return err;
2505
2506 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2507 len -= rq1->sadb_x_ipsecrequest_len;
2508
2509 if (len <= sizeof(*rq2) ||
2510 len < rq2->sadb_x_ipsecrequest_len ||
2511 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2512 return -EINVAL;
2513
2514 /* new endpoints */
2515 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2516 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2517 &m->new_saddr, &m->new_daddr,
2518 &m->new_family);
2519 if (err)
2520 return err;
2521
2522 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2523 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2524 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2525 return -EINVAL;
2526
2527 m->proto = rq1->sadb_x_ipsecrequest_proto;
2528 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2529 return -EINVAL;
2530 m->mode = mode;
2531 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2532
2533 return ((int)(rq1->sadb_x_ipsecrequest_len +
2534 rq2->sadb_x_ipsecrequest_len));
2535 }
2536
2537 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2538 const struct sadb_msg *hdr, void * const *ext_hdrs)
2539 {
2540 int i, len, ret, err = -EINVAL;
2541 u8 dir;
2542 struct sadb_address *sa;
2543 struct sadb_x_kmaddress *kma;
2544 struct sadb_x_policy *pol;
2545 struct sadb_x_ipsecrequest *rq;
2546 struct xfrm_selector sel;
2547 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2548 struct xfrm_kmaddress k;
2549 struct net *net = sock_net(sk);
2550
2551 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2552 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2553 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2554 err = -EINVAL;
2555 goto out;
2556 }
2557
2558 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2559 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2560
2561 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2562 err = -EINVAL;
2563 goto out;
2564 }
2565
2566 if (kma) {
2567 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2568 k.reserved = kma->sadb_x_kmaddress_reserved;
2569 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2570 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2571 &k.local, &k.remote, &k.family);
2572 if (ret < 0) {
2573 err = ret;
2574 goto out;
2575 }
2576 }
2577
2578 dir = pol->sadb_x_policy_dir - 1;
2579 memset(&sel, 0, sizeof(sel));
2580
2581 /* set source address info of selector */
2582 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2583 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2584 sel.prefixlen_s = sa->sadb_address_prefixlen;
2585 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2586 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2587 if (sel.sport)
2588 sel.sport_mask = htons(0xffff);
2589
2590 /* set destination address info of selector */
2591 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2592 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2593 sel.prefixlen_d = sa->sadb_address_prefixlen;
2594 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2595 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2596 if (sel.dport)
2597 sel.dport_mask = htons(0xffff);
2598
2599 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2600
2601 /* extract ipsecrequests */
2602 i = 0;
2603 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2604
2605 while (len > 0 && i < XFRM_MAX_DEPTH) {
2606 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2607 if (ret < 0) {
2608 err = ret;
2609 goto out;
2610 } else {
2611 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2612 len -= ret;
2613 i++;
2614 }
2615 }
2616
2617 if (!i || len > 0) {
2618 err = -EINVAL;
2619 goto out;
2620 }
2621
2622 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2623 kma ? &k : NULL, net, NULL);
2624
2625 out:
2626 return err;
2627 }
2628 #else
2629 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2630 const struct sadb_msg *hdr, void * const *ext_hdrs)
2631 {
2632 return -ENOPROTOOPT;
2633 }
2634 #endif
2635
2636
2637 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2638 {
2639 struct net *net = sock_net(sk);
2640 unsigned int dir;
2641 int err = 0, delete;
2642 struct sadb_x_policy *pol;
2643 struct xfrm_policy *xp;
2644 struct km_event c;
2645
2646 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2647 return -EINVAL;
2648
2649 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2650 if (dir >= XFRM_POLICY_MAX)
2651 return -EINVAL;
2652
2653 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2654 xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2655 dir, pol->sadb_x_policy_id, delete, &err);
2656 if (xp == NULL)
2657 return -ENOENT;
2658
2659 if (delete) {
2660 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2661
2662 if (err)
2663 goto out;
2664 c.seq = hdr->sadb_msg_seq;
2665 c.portid = hdr->sadb_msg_pid;
2666 c.data.byid = 1;
2667 c.event = XFRM_MSG_DELPOLICY;
2668 km_policy_notify(xp, dir, &c);
2669 } else {
2670 err = key_pol_get_resp(sk, xp, hdr, dir);
2671 }
2672
2673 out:
2674 xfrm_pol_put(xp);
2675 return err;
2676 }
2677
2678 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2679 {
2680 struct pfkey_sock *pfk = ptr;
2681 struct sk_buff *out_skb;
2682 struct sadb_msg *out_hdr;
2683 int err;
2684
2685 if (!pfkey_can_dump(&pfk->sk))
2686 return -ENOBUFS;
2687
2688 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2689 if (IS_ERR(out_skb))
2690 return PTR_ERR(out_skb);
2691
2692 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2693 if (err < 0)
2694 return err;
2695
2696 out_hdr = (struct sadb_msg *) out_skb->data;
2697 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2698 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2699 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2700 out_hdr->sadb_msg_errno = 0;
2701 out_hdr->sadb_msg_seq = count + 1;
2702 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2703
2704 if (pfk->dump.skb)
2705 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2706 &pfk->sk, sock_net(&pfk->sk));
2707 pfk->dump.skb = out_skb;
2708
2709 return 0;
2710 }
2711
2712 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2713 {
2714 struct net *net = sock_net(&pfk->sk);
2715 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2716 }
2717
2718 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2719 {
2720 struct net *net = sock_net((struct sock *)pfk);
2721
2722 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2723 }
2724
2725 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2726 {
2727 struct pfkey_sock *pfk = pfkey_sk(sk);
2728
2729 mutex_lock(&pfk->dump_lock);
2730 if (pfk->dump.dump != NULL) {
2731 mutex_unlock(&pfk->dump_lock);
2732 return -EBUSY;
2733 }
2734
2735 pfk->dump.msg_version = hdr->sadb_msg_version;
2736 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2737 pfk->dump.dump = pfkey_dump_sp;
2738 pfk->dump.done = pfkey_dump_sp_done;
2739 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2740 mutex_unlock(&pfk->dump_lock);
2741
2742 return pfkey_do_dump(pfk);
2743 }
2744
2745 static int key_notify_policy_flush(const struct km_event *c)
2746 {
2747 struct sk_buff *skb_out;
2748 struct sadb_msg *hdr;
2749
2750 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2751 if (!skb_out)
2752 return -ENOBUFS;
2753 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2754 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2755 hdr->sadb_msg_seq = c->seq;
2756 hdr->sadb_msg_pid = c->portid;
2757 hdr->sadb_msg_version = PF_KEY_V2;
2758 hdr->sadb_msg_errno = (uint8_t) 0;
2759 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2760 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2761 hdr->sadb_msg_reserved = 0;
2762 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2763 return 0;
2764
2765 }
2766
2767 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2768 {
2769 struct net *net = sock_net(sk);
2770 struct km_event c;
2771 int err, err2;
2772
2773 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2774 err2 = unicast_flush_resp(sk, hdr);
2775 if (err || err2) {
2776 if (err == -ESRCH) /* empty table - old silent behavior */
2777 return 0;
2778 return err;
2779 }
2780
2781 c.data.type = XFRM_POLICY_TYPE_MAIN;
2782 c.event = XFRM_MSG_FLUSHPOLICY;
2783 c.portid = hdr->sadb_msg_pid;
2784 c.seq = hdr->sadb_msg_seq;
2785 c.net = net;
2786 km_policy_notify(NULL, 0, &c);
2787
2788 return 0;
2789 }
2790
2791 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2792 const struct sadb_msg *hdr, void * const *ext_hdrs);
2793 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2794 [SADB_RESERVED] = pfkey_reserved,
2795 [SADB_GETSPI] = pfkey_getspi,
2796 [SADB_UPDATE] = pfkey_add,
2797 [SADB_ADD] = pfkey_add,
2798 [SADB_DELETE] = pfkey_delete,
2799 [SADB_GET] = pfkey_get,
2800 [SADB_ACQUIRE] = pfkey_acquire,
2801 [SADB_REGISTER] = pfkey_register,
2802 [SADB_EXPIRE] = NULL,
2803 [SADB_FLUSH] = pfkey_flush,
2804 [SADB_DUMP] = pfkey_dump,
2805 [SADB_X_PROMISC] = pfkey_promisc,
2806 [SADB_X_PCHANGE] = NULL,
2807 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2808 [SADB_X_SPDADD] = pfkey_spdadd,
2809 [SADB_X_SPDDELETE] = pfkey_spddelete,
2810 [SADB_X_SPDGET] = pfkey_spdget,
2811 [SADB_X_SPDACQUIRE] = NULL,
2812 [SADB_X_SPDDUMP] = pfkey_spddump,
2813 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2814 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2815 [SADB_X_SPDDELETE2] = pfkey_spdget,
2816 [SADB_X_MIGRATE] = pfkey_migrate,
2817 };
2818
2819 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2820 {
2821 void *ext_hdrs[SADB_EXT_MAX];
2822 int err;
2823
2824 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2825 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2826
2827 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2828 err = parse_exthdrs(skb, hdr, ext_hdrs);
2829 if (!err) {
2830 err = -EOPNOTSUPP;
2831 if (pfkey_funcs[hdr->sadb_msg_type])
2832 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2833 }
2834 return err;
2835 }
2836
2837 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2838 {
2839 struct sadb_msg *hdr = NULL;
2840
2841 if (skb->len < sizeof(*hdr)) {
2842 *errp = -EMSGSIZE;
2843 } else {
2844 hdr = (struct sadb_msg *) skb->data;
2845 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2846 hdr->sadb_msg_reserved != 0 ||
2847 (hdr->sadb_msg_type <= SADB_RESERVED ||
2848 hdr->sadb_msg_type > SADB_MAX)) {
2849 hdr = NULL;
2850 *errp = -EINVAL;
2851 } else if (hdr->sadb_msg_len != (skb->len /
2852 sizeof(uint64_t)) ||
2853 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2854 sizeof(uint64_t))) {
2855 hdr = NULL;
2856 *errp = -EMSGSIZE;
2857 } else {
2858 *errp = 0;
2859 }
2860 }
2861 return hdr;
2862 }
2863
2864 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2865 const struct xfrm_algo_desc *d)
2866 {
2867 unsigned int id = d->desc.sadb_alg_id;
2868
2869 if (id >= sizeof(t->aalgos) * 8)
2870 return 0;
2871
2872 return (t->aalgos >> id) & 1;
2873 }
2874
2875 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2876 const struct xfrm_algo_desc *d)
2877 {
2878 unsigned int id = d->desc.sadb_alg_id;
2879
2880 if (id >= sizeof(t->ealgos) * 8)
2881 return 0;
2882
2883 return (t->ealgos >> id) & 1;
2884 }
2885
2886 static int count_ah_combs(const struct xfrm_tmpl *t)
2887 {
2888 int i, sz = 0;
2889
2890 for (i = 0; ; i++) {
2891 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2892 if (!aalg)
2893 break;
2894 if (!aalg->pfkey_supported)
2895 continue;
2896 if (aalg_tmpl_set(t, aalg) && aalg->available)
2897 sz += sizeof(struct sadb_comb);
2898 }
2899 return sz + sizeof(struct sadb_prop);
2900 }
2901
2902 static int count_esp_combs(const struct xfrm_tmpl *t)
2903 {
2904 int i, k, sz = 0;
2905
2906 for (i = 0; ; i++) {
2907 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2908 if (!ealg)
2909 break;
2910
2911 if (!ealg->pfkey_supported)
2912 continue;
2913
2914 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2915 continue;
2916
2917 for (k = 1; ; k++) {
2918 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2919 if (!aalg)
2920 break;
2921
2922 if (!aalg->pfkey_supported)
2923 continue;
2924
2925 if (aalg_tmpl_set(t, aalg) && aalg->available)
2926 sz += sizeof(struct sadb_comb);
2927 }
2928 }
2929 return sz + sizeof(struct sadb_prop);
2930 }
2931
2932 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2933 {
2934 struct sadb_prop *p;
2935 int i;
2936
2937 p = skb_put(skb, sizeof(struct sadb_prop));
2938 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2939 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2940 p->sadb_prop_replay = 32;
2941 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2942
2943 for (i = 0; ; i++) {
2944 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2945 if (!aalg)
2946 break;
2947
2948 if (!aalg->pfkey_supported)
2949 continue;
2950
2951 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2952 struct sadb_comb *c;
2953 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2954 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2955 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2956 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2957 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2958 c->sadb_comb_hard_addtime = 24*60*60;
2959 c->sadb_comb_soft_addtime = 20*60*60;
2960 c->sadb_comb_hard_usetime = 8*60*60;
2961 c->sadb_comb_soft_usetime = 7*60*60;
2962 }
2963 }
2964 }
2965
2966 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2967 {
2968 struct sadb_prop *p;
2969 int i, k;
2970
2971 p = skb_put(skb, sizeof(struct sadb_prop));
2972 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2973 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2974 p->sadb_prop_replay = 32;
2975 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2976
2977 for (i=0; ; i++) {
2978 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2979 if (!ealg)
2980 break;
2981
2982 if (!ealg->pfkey_supported)
2983 continue;
2984
2985 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2986 continue;
2987
2988 for (k = 1; ; k++) {
2989 struct sadb_comb *c;
2990 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2991 if (!aalg)
2992 break;
2993 if (!aalg->pfkey_supported)
2994 continue;
2995 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2996 continue;
2997 c = skb_put(skb, sizeof(struct sadb_comb));
2998 memset(c, 0, sizeof(*c));
2999 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3000 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3001 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3002 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3003 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3004 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3005 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3006 c->sadb_comb_hard_addtime = 24*60*60;
3007 c->sadb_comb_soft_addtime = 20*60*60;
3008 c->sadb_comb_hard_usetime = 8*60*60;
3009 c->sadb_comb_soft_usetime = 7*60*60;
3010 }
3011 }
3012 }
3013
3014 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3015 {
3016 return 0;
3017 }
3018
3019 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3020 {
3021 struct sk_buff *out_skb;
3022 struct sadb_msg *out_hdr;
3023 int hard;
3024 int hsc;
3025
3026 hard = c->data.hard;
3027 if (hard)
3028 hsc = 2;
3029 else
3030 hsc = 1;
3031
3032 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3033 if (IS_ERR(out_skb))
3034 return PTR_ERR(out_skb);
3035
3036 out_hdr = (struct sadb_msg *) out_skb->data;
3037 out_hdr->sadb_msg_version = PF_KEY_V2;
3038 out_hdr->sadb_msg_type = SADB_EXPIRE;
3039 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3040 out_hdr->sadb_msg_errno = 0;
3041 out_hdr->sadb_msg_reserved = 0;
3042 out_hdr->sadb_msg_seq = 0;
3043 out_hdr->sadb_msg_pid = 0;
3044
3045 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3046 xs_net(x));
3047 return 0;
3048 }
3049
3050 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3051 {
3052 struct net *net = x ? xs_net(x) : c->net;
3053 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3054
3055 if (atomic_read(&net_pfkey->socks_nr) == 0)
3056 return 0;
3057
3058 switch (c->event) {
3059 case XFRM_MSG_EXPIRE:
3060 return key_notify_sa_expire(x, c);
3061 case XFRM_MSG_DELSA:
3062 case XFRM_MSG_NEWSA:
3063 case XFRM_MSG_UPDSA:
3064 return key_notify_sa(x, c);
3065 case XFRM_MSG_FLUSHSA:
3066 return key_notify_sa_flush(c);
3067 case XFRM_MSG_NEWAE: /* not yet supported */
3068 break;
3069 default:
3070 pr_err("pfkey: Unknown SA event %d\n", c->event);
3071 break;
3072 }
3073
3074 return 0;
3075 }
3076
3077 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3078 {
3079 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3080 return 0;
3081
3082 switch (c->event) {
3083 case XFRM_MSG_POLEXPIRE:
3084 return key_notify_policy_expire(xp, c);
3085 case XFRM_MSG_DELPOLICY:
3086 case XFRM_MSG_NEWPOLICY:
3087 case XFRM_MSG_UPDPOLICY:
3088 return key_notify_policy(xp, dir, c);
3089 case XFRM_MSG_FLUSHPOLICY:
3090 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3091 break;
3092 return key_notify_policy_flush(c);
3093 default:
3094 pr_err("pfkey: Unknown policy event %d\n", c->event);
3095 break;
3096 }
3097
3098 return 0;
3099 }
3100
3101 static u32 get_acqseq(void)
3102 {
3103 u32 res;
3104 static atomic_t acqseq;
3105
3106 do {
3107 res = atomic_inc_return(&acqseq);
3108 } while (!res);
3109 return res;
3110 }
3111
3112 static bool pfkey_is_alive(const struct km_event *c)
3113 {
3114 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3115 struct sock *sk;
3116 bool is_alive = false;
3117
3118 rcu_read_lock();
3119 sk_for_each_rcu(sk, &net_pfkey->table) {
3120 if (pfkey_sk(sk)->registered) {
3121 is_alive = true;
3122 break;
3123 }
3124 }
3125 rcu_read_unlock();
3126
3127 return is_alive;
3128 }
3129
3130 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3131 {
3132 struct sk_buff *skb;
3133 struct sadb_msg *hdr;
3134 struct sadb_address *addr;
3135 struct sadb_x_policy *pol;
3136 int sockaddr_size;
3137 int size;
3138 struct sadb_x_sec_ctx *sec_ctx;
3139 struct xfrm_sec_ctx *xfrm_ctx;
3140 int ctx_size = 0;
3141
3142 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3143 if (!sockaddr_size)
3144 return -EINVAL;
3145
3146 size = sizeof(struct sadb_msg) +
3147 (sizeof(struct sadb_address) * 2) +
3148 (sockaddr_size * 2) +
3149 sizeof(struct sadb_x_policy);
3150
3151 if (x->id.proto == IPPROTO_AH)
3152 size += count_ah_combs(t);
3153 else if (x->id.proto == IPPROTO_ESP)
3154 size += count_esp_combs(t);
3155
3156 if ((xfrm_ctx = x->security)) {
3157 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3158 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3159 }
3160
3161 skb = alloc_skb(size + 16, GFP_ATOMIC);
3162 if (skb == NULL)
3163 return -ENOMEM;
3164
3165 hdr = skb_put(skb, sizeof(struct sadb_msg));
3166 hdr->sadb_msg_version = PF_KEY_V2;
3167 hdr->sadb_msg_type = SADB_ACQUIRE;
3168 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3169 hdr->sadb_msg_len = size / sizeof(uint64_t);
3170 hdr->sadb_msg_errno = 0;
3171 hdr->sadb_msg_reserved = 0;
3172 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3173 hdr->sadb_msg_pid = 0;
3174
3175 /* src address */
3176 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3177 addr->sadb_address_len =
3178 (sizeof(struct sadb_address)+sockaddr_size)/
3179 sizeof(uint64_t);
3180 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3181 addr->sadb_address_proto = 0;
3182 addr->sadb_address_reserved = 0;
3183 addr->sadb_address_prefixlen =
3184 pfkey_sockaddr_fill(&x->props.saddr, 0,
3185 (struct sockaddr *) (addr + 1),
3186 x->props.family);
3187 if (!addr->sadb_address_prefixlen)
3188 BUG();
3189
3190 /* dst address */
3191 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3192 addr->sadb_address_len =
3193 (sizeof(struct sadb_address)+sockaddr_size)/
3194 sizeof(uint64_t);
3195 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3196 addr->sadb_address_proto = 0;
3197 addr->sadb_address_reserved = 0;
3198 addr->sadb_address_prefixlen =
3199 pfkey_sockaddr_fill(&x->id.daddr, 0,
3200 (struct sockaddr *) (addr + 1),
3201 x->props.family);
3202 if (!addr->sadb_address_prefixlen)
3203 BUG();
3204
3205 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3206 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3207 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3208 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3209 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3210 pol->sadb_x_policy_reserved = 0;
3211 pol->sadb_x_policy_id = xp->index;
3212 pol->sadb_x_policy_priority = xp->priority;
3213
3214 /* Set sadb_comb's. */
3215 if (x->id.proto == IPPROTO_AH)
3216 dump_ah_combs(skb, t);
3217 else if (x->id.proto == IPPROTO_ESP)
3218 dump_esp_combs(skb, t);
3219
3220 /* security context */
3221 if (xfrm_ctx) {
3222 sec_ctx = skb_put(skb,
3223 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3224 sec_ctx->sadb_x_sec_len =
3225 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3226 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3227 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3228 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3229 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3230 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3231 xfrm_ctx->ctx_len);
3232 }
3233
3234 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3235 xs_net(x));
3236 }
3237
3238 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3239 u8 *data, int len, int *dir)
3240 {
3241 struct net *net = sock_net(sk);
3242 struct xfrm_policy *xp;
3243 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3244 struct sadb_x_sec_ctx *sec_ctx;
3245
3246 switch (sk->sk_family) {
3247 case AF_INET:
3248 if (opt != IP_IPSEC_POLICY) {
3249 *dir = -EOPNOTSUPP;
3250 return NULL;
3251 }
3252 break;
3253 #if IS_ENABLED(CONFIG_IPV6)
3254 case AF_INET6:
3255 if (opt != IPV6_IPSEC_POLICY) {
3256 *dir = -EOPNOTSUPP;
3257 return NULL;
3258 }
3259 break;
3260 #endif
3261 default:
3262 *dir = -EINVAL;
3263 return NULL;
3264 }
3265
3266 *dir = -EINVAL;
3267
3268 if (len < sizeof(struct sadb_x_policy) ||
3269 pol->sadb_x_policy_len*8 > len ||
3270 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3271 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3272 return NULL;
3273
3274 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3275 if (xp == NULL) {
3276 *dir = -ENOBUFS;
3277 return NULL;
3278 }
3279
3280 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3281 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3282
3283 xp->lft.soft_byte_limit = XFRM_INF;
3284 xp->lft.hard_byte_limit = XFRM_INF;
3285 xp->lft.soft_packet_limit = XFRM_INF;
3286 xp->lft.hard_packet_limit = XFRM_INF;
3287 xp->family = sk->sk_family;
3288
3289 xp->xfrm_nr = 0;
3290 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3291 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3292 goto out;
3293
3294 /* security context too */
3295 if (len >= (pol->sadb_x_policy_len*8 +
3296 sizeof(struct sadb_x_sec_ctx))) {
3297 char *p = (char *)pol;
3298 struct xfrm_user_sec_ctx *uctx;
3299
3300 p += pol->sadb_x_policy_len*8;
3301 sec_ctx = (struct sadb_x_sec_ctx *)p;
3302 if (len < pol->sadb_x_policy_len*8 +
3303 sec_ctx->sadb_x_sec_len*8) {
3304 *dir = -EINVAL;
3305 goto out;
3306 }
3307 if ((*dir = verify_sec_ctx_len(p)))
3308 goto out;
3309 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3310 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3311 kfree(uctx);
3312
3313 if (*dir)
3314 goto out;
3315 }
3316
3317 *dir = pol->sadb_x_policy_dir-1;
3318 return xp;
3319
3320 out:
3321 xp->walk.dead = 1;
3322 xfrm_policy_destroy(xp);
3323 return NULL;
3324 }
3325
3326 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3327 {
3328 struct sk_buff *skb;
3329 struct sadb_msg *hdr;
3330 struct sadb_sa *sa;
3331 struct sadb_address *addr;
3332 struct sadb_x_nat_t_port *n_port;
3333 int sockaddr_size;
3334 int size;
3335 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3336 struct xfrm_encap_tmpl *natt = NULL;
3337
3338 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3339 if (!sockaddr_size)
3340 return -EINVAL;
3341
3342 if (!satype)
3343 return -EINVAL;
3344
3345 if (!x->encap)
3346 return -EINVAL;
3347
3348 natt = x->encap;
3349
3350 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3351 *
3352 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3353 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3354 */
3355
3356 size = sizeof(struct sadb_msg) +
3357 sizeof(struct sadb_sa) +
3358 (sizeof(struct sadb_address) * 2) +
3359 (sockaddr_size * 2) +
3360 (sizeof(struct sadb_x_nat_t_port) * 2);
3361
3362 skb = alloc_skb(size + 16, GFP_ATOMIC);
3363 if (skb == NULL)
3364 return -ENOMEM;
3365
3366 hdr = skb_put(skb, sizeof(struct sadb_msg));
3367 hdr->sadb_msg_version = PF_KEY_V2;
3368 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3369 hdr->sadb_msg_satype = satype;
3370 hdr->sadb_msg_len = size / sizeof(uint64_t);
3371 hdr->sadb_msg_errno = 0;
3372 hdr->sadb_msg_reserved = 0;
3373 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3374 hdr->sadb_msg_pid = 0;
3375
3376 /* SA */
3377 sa = skb_put(skb, sizeof(struct sadb_sa));
3378 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3379 sa->sadb_sa_exttype = SADB_EXT_SA;
3380 sa->sadb_sa_spi = x->id.spi;
3381 sa->sadb_sa_replay = 0;
3382 sa->sadb_sa_state = 0;
3383 sa->sadb_sa_auth = 0;
3384 sa->sadb_sa_encrypt = 0;
3385 sa->sadb_sa_flags = 0;
3386
3387 /* ADDRESS_SRC (old addr) */
3388 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3389 addr->sadb_address_len =
3390 (sizeof(struct sadb_address)+sockaddr_size)/
3391 sizeof(uint64_t);
3392 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3393 addr->sadb_address_proto = 0;
3394 addr->sadb_address_reserved = 0;
3395 addr->sadb_address_prefixlen =
3396 pfkey_sockaddr_fill(&x->props.saddr, 0,
3397 (struct sockaddr *) (addr + 1),
3398 x->props.family);
3399 if (!addr->sadb_address_prefixlen)
3400 BUG();
3401
3402 /* NAT_T_SPORT (old port) */
3403 n_port = skb_put(skb, sizeof(*n_port));
3404 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3405 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3406 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3407 n_port->sadb_x_nat_t_port_reserved = 0;
3408
3409 /* ADDRESS_DST (new addr) */
3410 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3411 addr->sadb_address_len =
3412 (sizeof(struct sadb_address)+sockaddr_size)/
3413 sizeof(uint64_t);
3414 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3415 addr->sadb_address_proto = 0;
3416 addr->sadb_address_reserved = 0;
3417 addr->sadb_address_prefixlen =
3418 pfkey_sockaddr_fill(ipaddr, 0,
3419 (struct sockaddr *) (addr + 1),
3420 x->props.family);
3421 if (!addr->sadb_address_prefixlen)
3422 BUG();
3423
3424 /* NAT_T_DPORT (new port) */
3425 n_port = skb_put(skb, sizeof(*n_port));
3426 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3427 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3428 n_port->sadb_x_nat_t_port_port = sport;
3429 n_port->sadb_x_nat_t_port_reserved = 0;
3430
3431 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3432 xs_net(x));
3433 }
3434
3435 #ifdef CONFIG_NET_KEY_MIGRATE
3436 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3437 const struct xfrm_selector *sel)
3438 {
3439 struct sadb_address *addr;
3440 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3441 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3442 addr->sadb_address_exttype = type;
3443 addr->sadb_address_proto = sel->proto;
3444 addr->sadb_address_reserved = 0;
3445
3446 switch (type) {
3447 case SADB_EXT_ADDRESS_SRC:
3448 addr->sadb_address_prefixlen = sel->prefixlen_s;
3449 pfkey_sockaddr_fill(&sel->saddr, 0,
3450 (struct sockaddr *)(addr + 1),
3451 sel->family);
3452 break;
3453 case SADB_EXT_ADDRESS_DST:
3454 addr->sadb_address_prefixlen = sel->prefixlen_d;
3455 pfkey_sockaddr_fill(&sel->daddr, 0,
3456 (struct sockaddr *)(addr + 1),
3457 sel->family);
3458 break;
3459 default:
3460 return -EINVAL;
3461 }
3462
3463 return 0;
3464 }
3465
3466
3467 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3468 {
3469 struct sadb_x_kmaddress *kma;
3470 u8 *sa;
3471 int family = k->family;
3472 int socklen = pfkey_sockaddr_len(family);
3473 int size_req;
3474
3475 size_req = (sizeof(struct sadb_x_kmaddress) +
3476 pfkey_sockaddr_pair_size(family));
3477
3478 kma = skb_put_zero(skb, size_req);
3479 kma->sadb_x_kmaddress_len = size_req / 8;
3480 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3481 kma->sadb_x_kmaddress_reserved = k->reserved;
3482
3483 sa = (u8 *)(kma + 1);
3484 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3485 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3486 return -EINVAL;
3487
3488 return 0;
3489 }
3490
3491 static int set_ipsecrequest(struct sk_buff *skb,
3492 uint8_t proto, uint8_t mode, int level,
3493 uint32_t reqid, uint8_t family,
3494 const xfrm_address_t *src, const xfrm_address_t *dst)
3495 {
3496 struct sadb_x_ipsecrequest *rq;
3497 u8 *sa;
3498 int socklen = pfkey_sockaddr_len(family);
3499 int size_req;
3500
3501 size_req = sizeof(struct sadb_x_ipsecrequest) +
3502 pfkey_sockaddr_pair_size(family);
3503
3504 rq = skb_put_zero(skb, size_req);
3505 rq->sadb_x_ipsecrequest_len = size_req;
3506 rq->sadb_x_ipsecrequest_proto = proto;
3507 rq->sadb_x_ipsecrequest_mode = mode;
3508 rq->sadb_x_ipsecrequest_level = level;
3509 rq->sadb_x_ipsecrequest_reqid = reqid;
3510
3511 sa = (u8 *) (rq + 1);
3512 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3513 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3514 return -EINVAL;
3515
3516 return 0;
3517 }
3518 #endif
3519
3520 #ifdef CONFIG_NET_KEY_MIGRATE
3521 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3522 const struct xfrm_migrate *m, int num_bundles,
3523 const struct xfrm_kmaddress *k,
3524 const struct xfrm_encap_tmpl *encap)
3525 {
3526 int i;
3527 int sasize_sel;
3528 int size = 0;
3529 int size_pol = 0;
3530 struct sk_buff *skb;
3531 struct sadb_msg *hdr;
3532 struct sadb_x_policy *pol;
3533 const struct xfrm_migrate *mp;
3534
3535 if (type != XFRM_POLICY_TYPE_MAIN)
3536 return 0;
3537
3538 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3539 return -EINVAL;
3540
3541 if (k != NULL) {
3542 /* addresses for KM */
3543 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3544 pfkey_sockaddr_pair_size(k->family));
3545 }
3546
3547 /* selector */
3548 sasize_sel = pfkey_sockaddr_size(sel->family);
3549 if (!sasize_sel)
3550 return -EINVAL;
3551 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3552
3553 /* policy info */
3554 size_pol += sizeof(struct sadb_x_policy);
3555
3556 /* ipsecrequests */
3557 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3558 /* old locator pair */
3559 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3560 pfkey_sockaddr_pair_size(mp->old_family);
3561 /* new locator pair */
3562 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3563 pfkey_sockaddr_pair_size(mp->new_family);
3564 }
3565
3566 size += sizeof(struct sadb_msg) + size_pol;
3567
3568 /* alloc buffer */
3569 skb = alloc_skb(size, GFP_ATOMIC);
3570 if (skb == NULL)
3571 return -ENOMEM;
3572
3573 hdr = skb_put(skb, sizeof(struct sadb_msg));
3574 hdr->sadb_msg_version = PF_KEY_V2;
3575 hdr->sadb_msg_type = SADB_X_MIGRATE;
3576 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3577 hdr->sadb_msg_len = size / 8;
3578 hdr->sadb_msg_errno = 0;
3579 hdr->sadb_msg_reserved = 0;
3580 hdr->sadb_msg_seq = 0;
3581 hdr->sadb_msg_pid = 0;
3582
3583 /* Addresses to be used by KM for negotiation, if ext is available */
3584 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3585 goto err;
3586
3587 /* selector src */
3588 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3589
3590 /* selector dst */
3591 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3592
3593 /* policy information */
3594 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3595 pol->sadb_x_policy_len = size_pol / 8;
3596 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3597 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3598 pol->sadb_x_policy_dir = dir + 1;
3599 pol->sadb_x_policy_reserved = 0;
3600 pol->sadb_x_policy_id = 0;
3601 pol->sadb_x_policy_priority = 0;
3602
3603 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3604 /* old ipsecrequest */
3605 int mode = pfkey_mode_from_xfrm(mp->mode);
3606 if (mode < 0)
3607 goto err;
3608 if (set_ipsecrequest(skb, mp->proto, mode,
3609 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3610 mp->reqid, mp->old_family,
3611 &mp->old_saddr, &mp->old_daddr) < 0)
3612 goto err;
3613
3614 /* new ipsecrequest */
3615 if (set_ipsecrequest(skb, mp->proto, mode,
3616 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3617 mp->reqid, mp->new_family,
3618 &mp->new_saddr, &mp->new_daddr) < 0)
3619 goto err;
3620 }
3621
3622 /* broadcast migrate message to sockets */
3623 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3624
3625 return 0;
3626
3627 err:
3628 kfree_skb(skb);
3629 return -EINVAL;
3630 }
3631 #else
3632 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3633 const struct xfrm_migrate *m, int num_bundles,
3634 const struct xfrm_kmaddress *k,
3635 const struct xfrm_encap_tmpl *encap)
3636 {
3637 return -ENOPROTOOPT;
3638 }
3639 #endif
3640
3641 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3642 {
3643 struct sock *sk = sock->sk;
3644 struct sk_buff *skb = NULL;
3645 struct sadb_msg *hdr = NULL;
3646 int err;
3647 struct net *net = sock_net(sk);
3648
3649 err = -EOPNOTSUPP;
3650 if (msg->msg_flags & MSG_OOB)
3651 goto out;
3652
3653 err = -EMSGSIZE;
3654 if ((unsigned int)len > sk->sk_sndbuf - 32)
3655 goto out;
3656
3657 err = -ENOBUFS;
3658 skb = alloc_skb(len, GFP_KERNEL);
3659 if (skb == NULL)
3660 goto out;
3661
3662 err = -EFAULT;
3663 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3664 goto out;
3665
3666 hdr = pfkey_get_base_msg(skb, &err);
3667 if (!hdr)
3668 goto out;
3669
3670 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3671 err = pfkey_process(sk, skb, hdr);
3672 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3673
3674 out:
3675 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3676 err = 0;
3677 kfree_skb(skb);
3678
3679 return err ? : len;
3680 }
3681
3682 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3683 int flags)
3684 {
3685 struct sock *sk = sock->sk;
3686 struct pfkey_sock *pfk = pfkey_sk(sk);
3687 struct sk_buff *skb;
3688 int copied, err;
3689
3690 err = -EINVAL;
3691 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3692 goto out;
3693
3694 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3695 if (skb == NULL)
3696 goto out;
3697
3698 copied = skb->len;
3699 if (copied > len) {
3700 msg->msg_flags |= MSG_TRUNC;
3701 copied = len;
3702 }
3703
3704 skb_reset_transport_header(skb);
3705 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3706 if (err)
3707 goto out_free;
3708
3709 sock_recv_ts_and_drops(msg, sk, skb);
3710
3711 err = (flags & MSG_TRUNC) ? skb->len : copied;
3712
3713 if (pfk->dump.dump != NULL &&
3714 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3715 pfkey_do_dump(pfk);
3716
3717 out_free:
3718 skb_free_datagram(sk, skb);
3719 out:
3720 return err;
3721 }
3722
3723 static const struct proto_ops pfkey_ops = {
3724 .family = PF_KEY,
3725 .owner = THIS_MODULE,
3726 /* Operations that make no sense on pfkey sockets. */
3727 .bind = sock_no_bind,
3728 .connect = sock_no_connect,
3729 .socketpair = sock_no_socketpair,
3730 .accept = sock_no_accept,
3731 .getname = sock_no_getname,
3732 .ioctl = sock_no_ioctl,
3733 .listen = sock_no_listen,
3734 .shutdown = sock_no_shutdown,
3735 .setsockopt = sock_no_setsockopt,
3736 .getsockopt = sock_no_getsockopt,
3737 .mmap = sock_no_mmap,
3738 .sendpage = sock_no_sendpage,
3739
3740 /* Now the operations that really occur. */
3741 .release = pfkey_release,
3742 .poll = datagram_poll,
3743 .sendmsg = pfkey_sendmsg,
3744 .recvmsg = pfkey_recvmsg,
3745 };
3746
3747 static const struct net_proto_family pfkey_family_ops = {
3748 .family = PF_KEY,
3749 .create = pfkey_create,
3750 .owner = THIS_MODULE,
3751 };
3752
3753 #ifdef CONFIG_PROC_FS
3754 static int pfkey_seq_show(struct seq_file *f, void *v)
3755 {
3756 struct sock *s = sk_entry(v);
3757
3758 if (v == SEQ_START_TOKEN)
3759 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3760 else
3761 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3762 s,
3763 refcount_read(&s->sk_refcnt),
3764 sk_rmem_alloc_get(s),
3765 sk_wmem_alloc_get(s),
3766 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3767 sock_i_ino(s)
3768 );
3769 return 0;
3770 }
3771
3772 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3773 __acquires(rcu)
3774 {
3775 struct net *net = seq_file_net(f);
3776 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3777
3778 rcu_read_lock();
3779 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3780 }
3781
3782 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3783 {
3784 struct net *net = seq_file_net(f);
3785 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3786
3787 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3788 }
3789
3790 static void pfkey_seq_stop(struct seq_file *f, void *v)
3791 __releases(rcu)
3792 {
3793 rcu_read_unlock();
3794 }
3795
3796 static const struct seq_operations pfkey_seq_ops = {
3797 .start = pfkey_seq_start,
3798 .next = pfkey_seq_next,
3799 .stop = pfkey_seq_stop,
3800 .show = pfkey_seq_show,
3801 };
3802
3803 static int __net_init pfkey_init_proc(struct net *net)
3804 {
3805 struct proc_dir_entry *e;
3806
3807 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3808 sizeof(struct seq_net_private));
3809 if (e == NULL)
3810 return -ENOMEM;
3811
3812 return 0;
3813 }
3814
3815 static void __net_exit pfkey_exit_proc(struct net *net)
3816 {
3817 remove_proc_entry("pfkey", net->proc_net);
3818 }
3819 #else
3820 static inline int pfkey_init_proc(struct net *net)
3821 {
3822 return 0;
3823 }
3824
3825 static inline void pfkey_exit_proc(struct net *net)
3826 {
3827 }
3828 #endif
3829
3830 static struct xfrm_mgr pfkeyv2_mgr =
3831 {
3832 .notify = pfkey_send_notify,
3833 .acquire = pfkey_send_acquire,
3834 .compile_policy = pfkey_compile_policy,
3835 .new_mapping = pfkey_send_new_mapping,
3836 .notify_policy = pfkey_send_policy_notify,
3837 .migrate = pfkey_send_migrate,
3838 .is_alive = pfkey_is_alive,
3839 };
3840
3841 static int __net_init pfkey_net_init(struct net *net)
3842 {
3843 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3844 int rv;
3845
3846 INIT_HLIST_HEAD(&net_pfkey->table);
3847 atomic_set(&net_pfkey->socks_nr, 0);
3848
3849 rv = pfkey_init_proc(net);
3850
3851 return rv;
3852 }
3853
3854 static void __net_exit pfkey_net_exit(struct net *net)
3855 {
3856 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3857
3858 pfkey_exit_proc(net);
3859 WARN_ON(!hlist_empty(&net_pfkey->table));
3860 }
3861
3862 static struct pernet_operations pfkey_net_ops = {
3863 .init = pfkey_net_init,
3864 .exit = pfkey_net_exit,
3865 .id = &pfkey_net_id,
3866 .size = sizeof(struct netns_pfkey),
3867 };
3868
3869 static void __exit ipsec_pfkey_exit(void)
3870 {
3871 xfrm_unregister_km(&pfkeyv2_mgr);
3872 sock_unregister(PF_KEY);
3873 unregister_pernet_subsys(&pfkey_net_ops);
3874 proto_unregister(&key_proto);
3875 }
3876
3877 static int __init ipsec_pfkey_init(void)
3878 {
3879 int err = proto_register(&key_proto, 0);
3880
3881 if (err != 0)
3882 goto out;
3883
3884 err = register_pernet_subsys(&pfkey_net_ops);
3885 if (err != 0)
3886 goto out_unregister_key_proto;
3887 err = sock_register(&pfkey_family_ops);
3888 if (err != 0)
3889 goto out_unregister_pernet;
3890 err = xfrm_register_km(&pfkeyv2_mgr);
3891 if (err != 0)
3892 goto out_sock_unregister;
3893 out:
3894 return err;
3895
3896 out_sock_unregister:
3897 sock_unregister(PF_KEY);
3898 out_unregister_pernet:
3899 unregister_pernet_subsys(&pfkey_net_ops);
3900 out_unregister_key_proto:
3901 proto_unregister(&key_proto);
3902 goto out;
3903 }
3904
3905 module_init(ipsec_pfkey_init);
3906 module_exit(ipsec_pfkey_exit);
3907 MODULE_LICENSE("GPL");
3908 MODULE_ALIAS_NETPROTO(PF_KEY);
Mirror of linux-2.6-arm at arm.linux.org.uk