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drm/mediatek: fix unbind functions
[linux/fpc-iii.git] / net / key / af_key.c
blob0b79c9aa8eb1f2184afbfe38cb29fa4b66b49ba6
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static unsigned int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 struct mutex dump_lock;
67 };
68
69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
70 xfrm_address_t *saddr, xfrm_address_t *daddr,
71 u16 *family);
72
73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
74 {
75 return (struct pfkey_sock *)sk;
76 }
77
78 static int pfkey_can_dump(const struct sock *sk)
79 {
80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
81 return 1;
82 return 0;
83 }
84
85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
86 {
87 if (pfk->dump.dump) {
88 if (pfk->dump.skb) {
89 kfree_skb(pfk->dump.skb);
90 pfk->dump.skb = NULL;
91 }
92 pfk->dump.done(pfk);
93 pfk->dump.dump = NULL;
94 pfk->dump.done = NULL;
95 }
96 }
97
98 static void pfkey_sock_destruct(struct sock *sk)
99 {
100 struct net *net = sock_net(sk);
101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
102
103 pfkey_terminate_dump(pfkey_sk(sk));
104 skb_queue_purge(&sk->sk_receive_queue);
105
106 if (!sock_flag(sk, SOCK_DEAD)) {
107 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
108 return;
109 }
110
111 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
112 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
113
114 atomic_dec(&net_pfkey->socks_nr);
115 }
116
117 static const struct proto_ops pfkey_ops;
118
119 static void pfkey_insert(struct sock *sk)
120 {
121 struct net *net = sock_net(sk);
122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
123
124 mutex_lock(&pfkey_mutex);
125 sk_add_node_rcu(sk, &net_pfkey->table);
126 mutex_unlock(&pfkey_mutex);
127 }
128
129 static void pfkey_remove(struct sock *sk)
130 {
131 mutex_lock(&pfkey_mutex);
132 sk_del_node_init_rcu(sk);
133 mutex_unlock(&pfkey_mutex);
134 }
135
136 static struct proto key_proto = {
137 .name = "KEY",
138 .owner = THIS_MODULE,
139 .obj_size = sizeof(struct pfkey_sock),
140 };
141
142 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
143 int kern)
144 {
145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
146 struct sock *sk;
147 struct pfkey_sock *pfk;
148 int err;
149
150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
151 return -EPERM;
152 if (sock->type != SOCK_RAW)
153 return -ESOCKTNOSUPPORT;
154 if (protocol != PF_KEY_V2)
155 return -EPROTONOSUPPORT;
156
157 err = -ENOMEM;
158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
159 if (sk == NULL)
160 goto out;
161
162 pfk = pfkey_sk(sk);
163 mutex_init(&pfk->dump_lock);
164
165 sock->ops = &pfkey_ops;
166 sock_init_data(sock, sk);
167
168 sk->sk_family = PF_KEY;
169 sk->sk_destruct = pfkey_sock_destruct;
170
171 atomic_inc(&net_pfkey->socks_nr);
172
173 pfkey_insert(sk);
174
175 return 0;
176 out:
177 return err;
178 }
179
180 static int pfkey_release(struct socket *sock)
181 {
182 struct sock *sk = sock->sk;
183
184 if (!sk)
185 return 0;
186
187 pfkey_remove(sk);
188
189 sock_orphan(sk);
190 sock->sk = NULL;
191 skb_queue_purge(&sk->sk_write_queue);
192
193 synchronize_rcu();
194 sock_put(sk);
195
196 return 0;
197 }
198
199 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
200 struct sock *sk)
201 {
202 int err = -ENOBUFS;
203
204 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
205 return err;
206
207 skb = skb_clone(skb, allocation);
208
209 if (skb) {
210 skb_set_owner_r(skb, sk);
211 skb_queue_tail(&sk->sk_receive_queue, skb);
212 sk->sk_data_ready(sk);
213 err = 0;
214 }
215 return err;
216 }
217
218 /* Send SKB to all pfkey sockets matching selected criteria. */
219 #define BROADCAST_ALL 0
220 #define BROADCAST_ONE 1
221 #define BROADCAST_REGISTERED 2
222 #define BROADCAST_PROMISC_ONLY 4
223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
224 int broadcast_flags, struct sock *one_sk,
225 struct net *net)
226 {
227 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
228 struct sock *sk;
229 int err = -ESRCH;
230
231 /* XXX Do we need something like netlink_overrun? I think
232 * XXX PF_KEY socket apps will not mind current behavior.
233 */
234 if (!skb)
235 return -ENOMEM;
236
237 rcu_read_lock();
238 sk_for_each_rcu(sk, &net_pfkey->table) {
239 struct pfkey_sock *pfk = pfkey_sk(sk);
240 int err2;
241
242 /* Yes, it means that if you are meant to receive this
243 * pfkey message you receive it twice as promiscuous
244 * socket.
245 */
246 if (pfk->promisc)
247 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
248
249 /* the exact target will be processed later */
250 if (sk == one_sk)
251 continue;
252 if (broadcast_flags != BROADCAST_ALL) {
253 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 continue;
255 if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 !pfk->registered)
257 continue;
258 if (broadcast_flags & BROADCAST_ONE)
259 continue;
260 }
261
262 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
263
264 /* Error is cleared after successful sending to at least one
265 * registered KM */
266 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 err = err2;
268 }
269 rcu_read_unlock();
270
271 if (one_sk != NULL)
272 err = pfkey_broadcast_one(skb, allocation, one_sk);
273
274 kfree_skb(skb);
275 return err;
276 }
277
278 static int pfkey_do_dump(struct pfkey_sock *pfk)
279 {
280 struct sadb_msg *hdr;
281 int rc;
282
283 mutex_lock(&pfk->dump_lock);
284 if (!pfk->dump.dump) {
285 rc = 0;
286 goto out;
287 }
288
289 rc = pfk->dump.dump(pfk);
290 if (rc == -ENOBUFS) {
291 rc = 0;
292 goto out;
293 }
294
295 if (pfk->dump.skb) {
296 if (!pfkey_can_dump(&pfk->sk)) {
297 rc = 0;
298 goto out;
299 }
300
301 hdr = (struct sadb_msg *) pfk->dump.skb->data;
302 hdr->sadb_msg_seq = 0;
303 hdr->sadb_msg_errno = rc;
304 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
305 &pfk->sk, sock_net(&pfk->sk));
306 pfk->dump.skb = NULL;
307 }
308
309 pfkey_terminate_dump(pfk);
310
311 out:
312 mutex_unlock(&pfk->dump_lock);
313 return rc;
314 }
315
316 static inline void pfkey_hdr_dup(struct sadb_msg *new,
317 const struct sadb_msg *orig)
318 {
319 *new = *orig;
320 }
321
322 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
323 {
324 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
325 struct sadb_msg *hdr;
326
327 if (!skb)
328 return -ENOBUFS;
329
330 /* Woe be to the platform trying to support PFKEY yet
331 * having normal errnos outside the 1-255 range, inclusive.
332 */
333 err = -err;
334 if (err == ERESTARTSYS ||
335 err == ERESTARTNOHAND ||
336 err == ERESTARTNOINTR)
337 err = EINTR;
338 if (err >= 512)
339 err = EINVAL;
340 BUG_ON(err <= 0 || err >= 256);
341
342 hdr = skb_put(skb, sizeof(struct sadb_msg));
343 pfkey_hdr_dup(hdr, orig);
344 hdr->sadb_msg_errno = (uint8_t) err;
345 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
346 sizeof(uint64_t));
347
348 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
349
350 return 0;
351 }
352
353 static const u8 sadb_ext_min_len[] = {
354 [SADB_EXT_RESERVED] = (u8) 0,
355 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
356 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
357 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
358 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
359 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
360 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
361 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
362 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
363 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
364 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
365 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
366 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
367 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
368 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
369 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
370 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
371 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
372 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
373 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
374 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
375 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
376 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
377 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
378 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
379 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
380 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
381 };
382
383 /* Verify sadb_address_{len,prefixlen} against sa_family. */
384 static int verify_address_len(const void *p)
385 {
386 const struct sadb_address *sp = p;
387 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
388 const struct sockaddr_in *sin;
389 #if IS_ENABLED(CONFIG_IPV6)
390 const struct sockaddr_in6 *sin6;
391 #endif
392 int len;
393
394 if (sp->sadb_address_len <
395 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
396 sizeof(uint64_t)))
397 return -EINVAL;
398
399 switch (addr->sa_family) {
400 case AF_INET:
401 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
402 if (sp->sadb_address_len != len ||
403 sp->sadb_address_prefixlen > 32)
404 return -EINVAL;
405 break;
406 #if IS_ENABLED(CONFIG_IPV6)
407 case AF_INET6:
408 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
409 if (sp->sadb_address_len != len ||
410 sp->sadb_address_prefixlen > 128)
411 return -EINVAL;
412 break;
413 #endif
414 default:
415 /* It is user using kernel to keep track of security
416 * associations for another protocol, such as
417 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
418 * lengths.
419 *
420 * XXX Actually, association/policy database is not yet
421 * XXX able to cope with arbitrary sockaddr families.
422 * XXX When it can, remove this -EINVAL. -DaveM
423 */
424 return -EINVAL;
425 }
426
427 return 0;
428 }
429
430 static inline int sadb_key_len(const struct sadb_key *key)
431 {
432 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
433
434 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
435 sizeof(uint64_t));
436 }
437
438 static int verify_key_len(const void *p)
439 {
440 const struct sadb_key *key = p;
441
442 if (sadb_key_len(key) > key->sadb_key_len)
443 return -EINVAL;
444
445 return 0;
446 }
447
448 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
449 {
450 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
451 sec_ctx->sadb_x_ctx_len,
452 sizeof(uint64_t));
453 }
454
455 static inline int verify_sec_ctx_len(const void *p)
456 {
457 const struct sadb_x_sec_ctx *sec_ctx = p;
458 int len = sec_ctx->sadb_x_ctx_len;
459
460 if (len > PAGE_SIZE)
461 return -EINVAL;
462
463 len = pfkey_sec_ctx_len(sec_ctx);
464
465 if (sec_ctx->sadb_x_sec_len != len)
466 return -EINVAL;
467
468 return 0;
469 }
470
471 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
472 gfp_t gfp)
473 {
474 struct xfrm_user_sec_ctx *uctx = NULL;
475 int ctx_size = sec_ctx->sadb_x_ctx_len;
476
477 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
478
479 if (!uctx)
480 return NULL;
481
482 uctx->len = pfkey_sec_ctx_len(sec_ctx);
483 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
484 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
485 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
486 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
487 memcpy(uctx + 1, sec_ctx + 1,
488 uctx->ctx_len);
489
490 return uctx;
491 }
492
493 static int present_and_same_family(const struct sadb_address *src,
494 const struct sadb_address *dst)
495 {
496 const struct sockaddr *s_addr, *d_addr;
497
498 if (!src || !dst)
499 return 0;
500
501 s_addr = (const struct sockaddr *)(src + 1);
502 d_addr = (const struct sockaddr *)(dst + 1);
503 if (s_addr->sa_family != d_addr->sa_family)
504 return 0;
505 if (s_addr->sa_family != AF_INET
506 #if IS_ENABLED(CONFIG_IPV6)
507 && s_addr->sa_family != AF_INET6
508 #endif
509 )
510 return 0;
511
512 return 1;
513 }
514
515 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
516 {
517 const char *p = (char *) hdr;
518 int len = skb->len;
519
520 len -= sizeof(*hdr);
521 p += sizeof(*hdr);
522 while (len > 0) {
523 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
524 uint16_t ext_type;
525 int ext_len;
526
527 if (len < sizeof(*ehdr))
528 return -EINVAL;
529
530 ext_len = ehdr->sadb_ext_len;
531 ext_len *= sizeof(uint64_t);
532 ext_type = ehdr->sadb_ext_type;
533 if (ext_len < sizeof(uint64_t) ||
534 ext_len > len ||
535 ext_type == SADB_EXT_RESERVED)
536 return -EINVAL;
537
538 if (ext_type <= SADB_EXT_MAX) {
539 int min = (int) sadb_ext_min_len[ext_type];
540 if (ext_len < min)
541 return -EINVAL;
542 if (ext_hdrs[ext_type-1] != NULL)
543 return -EINVAL;
544 switch (ext_type) {
545 case SADB_EXT_ADDRESS_SRC:
546 case SADB_EXT_ADDRESS_DST:
547 case SADB_EXT_ADDRESS_PROXY:
548 case SADB_X_EXT_NAT_T_OA:
549 if (verify_address_len(p))
550 return -EINVAL;
551 break;
552 case SADB_X_EXT_SEC_CTX:
553 if (verify_sec_ctx_len(p))
554 return -EINVAL;
555 break;
556 case SADB_EXT_KEY_AUTH:
557 case SADB_EXT_KEY_ENCRYPT:
558 if (verify_key_len(p))
559 return -EINVAL;
560 break;
561 default:
562 break;
563 }
564 ext_hdrs[ext_type-1] = (void *) p;
565 }
566 p += ext_len;
567 len -= ext_len;
568 }
569
570 return 0;
571 }
572
573 static uint16_t
574 pfkey_satype2proto(uint8_t satype)
575 {
576 switch (satype) {
577 case SADB_SATYPE_UNSPEC:
578 return IPSEC_PROTO_ANY;
579 case SADB_SATYPE_AH:
580 return IPPROTO_AH;
581 case SADB_SATYPE_ESP:
582 return IPPROTO_ESP;
583 case SADB_X_SATYPE_IPCOMP:
584 return IPPROTO_COMP;
585 default:
586 return 0;
587 }
588 /* NOTREACHED */
589 }
590
591 static uint8_t
592 pfkey_proto2satype(uint16_t proto)
593 {
594 switch (proto) {
595 case IPPROTO_AH:
596 return SADB_SATYPE_AH;
597 case IPPROTO_ESP:
598 return SADB_SATYPE_ESP;
599 case IPPROTO_COMP:
600 return SADB_X_SATYPE_IPCOMP;
601 default:
602 return 0;
603 }
604 /* NOTREACHED */
605 }
606
607 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
608 * say specifically 'just raw sockets' as we encode them as 255.
609 */
610
611 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
612 {
613 return proto == IPSEC_PROTO_ANY ? 0 : proto;
614 }
615
616 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
617 {
618 return proto ? proto : IPSEC_PROTO_ANY;
619 }
620
621 static inline int pfkey_sockaddr_len(sa_family_t family)
622 {
623 switch (family) {
624 case AF_INET:
625 return sizeof(struct sockaddr_in);
626 #if IS_ENABLED(CONFIG_IPV6)
627 case AF_INET6:
628 return sizeof(struct sockaddr_in6);
629 #endif
630 }
631 return 0;
632 }
633
634 static
635 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
636 {
637 switch (sa->sa_family) {
638 case AF_INET:
639 xaddr->a4 =
640 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
641 return AF_INET;
642 #if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 memcpy(xaddr->a6,
645 &((struct sockaddr_in6 *)sa)->sin6_addr,
646 sizeof(struct in6_addr));
647 return AF_INET6;
648 #endif
649 }
650 return 0;
651 }
652
653 static
654 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
655 {
656 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
657 xaddr);
658 }
659
660 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
661 {
662 const struct sadb_sa *sa;
663 const struct sadb_address *addr;
664 uint16_t proto;
665 unsigned short family;
666 xfrm_address_t *xaddr;
667
668 sa = ext_hdrs[SADB_EXT_SA - 1];
669 if (sa == NULL)
670 return NULL;
671
672 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
673 if (proto == 0)
674 return NULL;
675
676 /* sadb_address_len should be checked by caller */
677 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
678 if (addr == NULL)
679 return NULL;
680
681 family = ((const struct sockaddr *)(addr + 1))->sa_family;
682 switch (family) {
683 case AF_INET:
684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
685 break;
686 #if IS_ENABLED(CONFIG_IPV6)
687 case AF_INET6:
688 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
689 break;
690 #endif
691 default:
692 xaddr = NULL;
693 }
694
695 if (!xaddr)
696 return NULL;
697
698 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
699 }
700
701 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
702
703 static int
704 pfkey_sockaddr_size(sa_family_t family)
705 {
706 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
707 }
708
709 static inline int pfkey_mode_from_xfrm(int mode)
710 {
711 switch(mode) {
712 case XFRM_MODE_TRANSPORT:
713 return IPSEC_MODE_TRANSPORT;
714 case XFRM_MODE_TUNNEL:
715 return IPSEC_MODE_TUNNEL;
716 case XFRM_MODE_BEET:
717 return IPSEC_MODE_BEET;
718 default:
719 return -1;
720 }
721 }
722
723 static inline int pfkey_mode_to_xfrm(int mode)
724 {
725 switch(mode) {
726 case IPSEC_MODE_ANY: /*XXX*/
727 case IPSEC_MODE_TRANSPORT:
728 return XFRM_MODE_TRANSPORT;
729 case IPSEC_MODE_TUNNEL:
730 return XFRM_MODE_TUNNEL;
731 case IPSEC_MODE_BEET:
732 return XFRM_MODE_BEET;
733 default:
734 return -1;
735 }
736 }
737
738 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
739 struct sockaddr *sa,
740 unsigned short family)
741 {
742 switch (family) {
743 case AF_INET:
744 {
745 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
746 sin->sin_family = AF_INET;
747 sin->sin_port = port;
748 sin->sin_addr.s_addr = xaddr->a4;
749 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
750 return 32;
751 }
752 #if IS_ENABLED(CONFIG_IPV6)
753 case AF_INET6:
754 {
755 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
756 sin6->sin6_family = AF_INET6;
757 sin6->sin6_port = port;
758 sin6->sin6_flowinfo = 0;
759 sin6->sin6_addr = xaddr->in6;
760 sin6->sin6_scope_id = 0;
761 return 128;
762 }
763 #endif
764 }
765 return 0;
766 }
767
768 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
769 int add_keys, int hsc)
770 {
771 struct sk_buff *skb;
772 struct sadb_msg *hdr;
773 struct sadb_sa *sa;
774 struct sadb_lifetime *lifetime;
775 struct sadb_address *addr;
776 struct sadb_key *key;
777 struct sadb_x_sa2 *sa2;
778 struct sadb_x_sec_ctx *sec_ctx;
779 struct xfrm_sec_ctx *xfrm_ctx;
780 int ctx_size = 0;
781 int size;
782 int auth_key_size = 0;
783 int encrypt_key_size = 0;
784 int sockaddr_size;
785 struct xfrm_encap_tmpl *natt = NULL;
786 int mode;
787
788 /* address family check */
789 sockaddr_size = pfkey_sockaddr_size(x->props.family);
790 if (!sockaddr_size)
791 return ERR_PTR(-EINVAL);
792
793 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
794 key(AE), (identity(SD),) (sensitivity)> */
795 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
796 sizeof(struct sadb_lifetime) +
797 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
798 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
799 sizeof(struct sadb_address)*2 +
800 sockaddr_size*2 +
801 sizeof(struct sadb_x_sa2);
802
803 if ((xfrm_ctx = x->security)) {
804 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
805 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
806 }
807
808 /* identity & sensitivity */
809 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
810 size += sizeof(struct sadb_address) + sockaddr_size;
811
812 if (add_keys) {
813 if (x->aalg && x->aalg->alg_key_len) {
814 auth_key_size =
815 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
816 size += sizeof(struct sadb_key) + auth_key_size;
817 }
818 if (x->ealg && x->ealg->alg_key_len) {
819 encrypt_key_size =
820 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
821 size += sizeof(struct sadb_key) + encrypt_key_size;
822 }
823 }
824 if (x->encap)
825 natt = x->encap;
826
827 if (natt && natt->encap_type) {
828 size += sizeof(struct sadb_x_nat_t_type);
829 size += sizeof(struct sadb_x_nat_t_port);
830 size += sizeof(struct sadb_x_nat_t_port);
831 }
832
833 skb = alloc_skb(size + 16, GFP_ATOMIC);
834 if (skb == NULL)
835 return ERR_PTR(-ENOBUFS);
836
837 /* call should fill header later */
838 hdr = skb_put(skb, sizeof(struct sadb_msg));
839 memset(hdr, 0, size); /* XXX do we need this ? */
840 hdr->sadb_msg_len = size / sizeof(uint64_t);
841
842 /* sa */
843 sa = skb_put(skb, sizeof(struct sadb_sa));
844 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
845 sa->sadb_sa_exttype = SADB_EXT_SA;
846 sa->sadb_sa_spi = x->id.spi;
847 sa->sadb_sa_replay = x->props.replay_window;
848 switch (x->km.state) {
849 case XFRM_STATE_VALID:
850 sa->sadb_sa_state = x->km.dying ?
851 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
852 break;
853 case XFRM_STATE_ACQ:
854 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
855 break;
856 default:
857 sa->sadb_sa_state = SADB_SASTATE_DEAD;
858 break;
859 }
860 sa->sadb_sa_auth = 0;
861 if (x->aalg) {
862 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
863 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
864 a->desc.sadb_alg_id : 0;
865 }
866 sa->sadb_sa_encrypt = 0;
867 BUG_ON(x->ealg && x->calg);
868 if (x->ealg) {
869 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
870 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
871 a->desc.sadb_alg_id : 0;
872 }
873 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
874 if (x->calg) {
875 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
876 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
877 a->desc.sadb_alg_id : 0;
878 }
879
880 sa->sadb_sa_flags = 0;
881 if (x->props.flags & XFRM_STATE_NOECN)
882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
883 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
884 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
885 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
886 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
887
888 /* hard time */
889 if (hsc & 2) {
890 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
891 lifetime->sadb_lifetime_len =
892 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
893 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
894 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
895 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
896 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
897 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
898 }
899 /* soft time */
900 if (hsc & 1) {
901 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
902 lifetime->sadb_lifetime_len =
903 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
904 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
905 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
906 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
907 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
908 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
909 }
910 /* current time */
911 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
912 lifetime->sadb_lifetime_len =
913 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
914 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
915 lifetime->sadb_lifetime_allocations = x->curlft.packets;
916 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
917 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
918 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
919 /* src address */
920 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
921 addr->sadb_address_len =
922 (sizeof(struct sadb_address)+sockaddr_size)/
923 sizeof(uint64_t);
924 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
925 /* "if the ports are non-zero, then the sadb_address_proto field,
926 normally zero, MUST be filled in with the transport
927 protocol's number." - RFC2367 */
928 addr->sadb_address_proto = 0;
929 addr->sadb_address_reserved = 0;
930
931 addr->sadb_address_prefixlen =
932 pfkey_sockaddr_fill(&x->props.saddr, 0,
933 (struct sockaddr *) (addr + 1),
934 x->props.family);
935 if (!addr->sadb_address_prefixlen)
936 BUG();
937
938 /* dst address */
939 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
940 addr->sadb_address_len =
941 (sizeof(struct sadb_address)+sockaddr_size)/
942 sizeof(uint64_t);
943 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
944 addr->sadb_address_proto = 0;
945 addr->sadb_address_reserved = 0;
946
947 addr->sadb_address_prefixlen =
948 pfkey_sockaddr_fill(&x->id.daddr, 0,
949 (struct sockaddr *) (addr + 1),
950 x->props.family);
951 if (!addr->sadb_address_prefixlen)
952 BUG();
953
954 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
955 x->props.family)) {
956 addr = skb_put(skb,
957 sizeof(struct sadb_address) + sockaddr_size);
958 addr->sadb_address_len =
959 (sizeof(struct sadb_address)+sockaddr_size)/
960 sizeof(uint64_t);
961 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
962 addr->sadb_address_proto =
963 pfkey_proto_from_xfrm(x->sel.proto);
964 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
965 addr->sadb_address_reserved = 0;
966
967 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
968 (struct sockaddr *) (addr + 1),
969 x->props.family);
970 }
971
972 /* auth key */
973 if (add_keys && auth_key_size) {
974 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
975 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
976 sizeof(uint64_t);
977 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
978 key->sadb_key_bits = x->aalg->alg_key_len;
979 key->sadb_key_reserved = 0;
980 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
981 }
982 /* encrypt key */
983 if (add_keys && encrypt_key_size) {
984 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
985 key->sadb_key_len = (sizeof(struct sadb_key) +
986 encrypt_key_size) / sizeof(uint64_t);
987 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
988 key->sadb_key_bits = x->ealg->alg_key_len;
989 key->sadb_key_reserved = 0;
990 memcpy(key + 1, x->ealg->alg_key,
991 (x->ealg->alg_key_len+7)/8);
992 }
993
994 /* sa */
995 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
996 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
997 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
998 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
999 kfree_skb(skb);
1000 return ERR_PTR(-EINVAL);
1001 }
1002 sa2->sadb_x_sa2_mode = mode;
1003 sa2->sadb_x_sa2_reserved1 = 0;
1004 sa2->sadb_x_sa2_reserved2 = 0;
1005 sa2->sadb_x_sa2_sequence = 0;
1006 sa2->sadb_x_sa2_reqid = x->props.reqid;
1007
1008 if (natt && natt->encap_type) {
1009 struct sadb_x_nat_t_type *n_type;
1010 struct sadb_x_nat_t_port *n_port;
1011
1012 /* type */
1013 n_type = skb_put(skb, sizeof(*n_type));
1014 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1015 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1016 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1017 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1018 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1019 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1020
1021 /* source port */
1022 n_port = skb_put(skb, sizeof(*n_port));
1023 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1024 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1026 n_port->sadb_x_nat_t_port_reserved = 0;
1027
1028 /* dest port */
1029 n_port = skb_put(skb, sizeof(*n_port));
1030 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1031 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1032 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1033 n_port->sadb_x_nat_t_port_reserved = 0;
1034 }
1035
1036 /* security context */
1037 if (xfrm_ctx) {
1038 sec_ctx = skb_put(skb,
1039 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1040 sec_ctx->sadb_x_sec_len =
1041 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1042 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1043 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1044 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1045 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1046 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1047 xfrm_ctx->ctx_len);
1048 }
1049
1050 return skb;
1051 }
1052
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1055 {
1056 struct sk_buff *skb;
1057
1058 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1059
1060 return skb;
1061 }
1062
1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1064 int hsc)
1065 {
1066 return __pfkey_xfrm_state2msg(x, 0, hsc);
1067 }
1068
1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1070 const struct sadb_msg *hdr,
1071 void * const *ext_hdrs)
1072 {
1073 struct xfrm_state *x;
1074 const struct sadb_lifetime *lifetime;
1075 const struct sadb_sa *sa;
1076 const struct sadb_key *key;
1077 const struct sadb_x_sec_ctx *sec_ctx;
1078 uint16_t proto;
1079 int err;
1080
1081
1082 sa = ext_hdrs[SADB_EXT_SA - 1];
1083 if (!sa ||
1084 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1085 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1086 return ERR_PTR(-EINVAL);
1087 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1088 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1089 return ERR_PTR(-EINVAL);
1090 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1091 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1092 return ERR_PTR(-EINVAL);
1093 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1094 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1095 return ERR_PTR(-EINVAL);
1096
1097 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1098 if (proto == 0)
1099 return ERR_PTR(-EINVAL);
1100
1101 /* default error is no buffer space */
1102 err = -ENOBUFS;
1103
1104 /* RFC2367:
1105
1106 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1107 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1108 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1109 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1110 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1111 not true.
1112
1113 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1114 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1115 */
1116 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1117 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1118 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1119 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1120 return ERR_PTR(-EINVAL);
1121 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1122 if (key != NULL &&
1123 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1124 key->sadb_key_bits == 0)
1125 return ERR_PTR(-EINVAL);
1126 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1127 if (key != NULL &&
1128 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1129 key->sadb_key_bits == 0)
1130 return ERR_PTR(-EINVAL);
1131
1132 x = xfrm_state_alloc(net);
1133 if (x == NULL)
1134 return ERR_PTR(-ENOBUFS);
1135
1136 x->id.proto = proto;
1137 x->id.spi = sa->sadb_sa_spi;
1138 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1139 (sizeof(x->replay.bitmap) * 8));
1140 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1141 x->props.flags |= XFRM_STATE_NOECN;
1142 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1143 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1144 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1145 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1146
1147 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1148 if (lifetime != NULL) {
1149 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1150 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1151 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1152 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1153 }
1154 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1155 if (lifetime != NULL) {
1156 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1157 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1158 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1159 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1160 }
1161
1162 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1163 if (sec_ctx != NULL) {
1164 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1165
1166 if (!uctx)
1167 goto out;
1168
1169 err = security_xfrm_state_alloc(x, uctx);
1170 kfree(uctx);
1171
1172 if (err)
1173 goto out;
1174 }
1175
1176 err = -ENOBUFS;
1177 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1178 if (sa->sadb_sa_auth) {
1179 int keysize = 0;
1180 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1181 if (!a || !a->pfkey_supported) {
1182 err = -ENOSYS;
1183 goto out;
1184 }
1185 if (key)
1186 keysize = (key->sadb_key_bits + 7) / 8;
1187 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1188 if (!x->aalg) {
1189 err = -ENOMEM;
1190 goto out;
1191 }
1192 strcpy(x->aalg->alg_name, a->name);
1193 x->aalg->alg_key_len = 0;
1194 if (key) {
1195 x->aalg->alg_key_len = key->sadb_key_bits;
1196 memcpy(x->aalg->alg_key, key+1, keysize);
1197 }
1198 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1199 x->props.aalgo = sa->sadb_sa_auth;
1200 /* x->algo.flags = sa->sadb_sa_flags; */
1201 }
1202 if (sa->sadb_sa_encrypt) {
1203 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1204 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1205 if (!a || !a->pfkey_supported) {
1206 err = -ENOSYS;
1207 goto out;
1208 }
1209 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1210 if (!x->calg) {
1211 err = -ENOMEM;
1212 goto out;
1213 }
1214 strcpy(x->calg->alg_name, a->name);
1215 x->props.calgo = sa->sadb_sa_encrypt;
1216 } else {
1217 int keysize = 0;
1218 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1219 if (!a || !a->pfkey_supported) {
1220 err = -ENOSYS;
1221 goto out;
1222 }
1223 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1224 if (key)
1225 keysize = (key->sadb_key_bits + 7) / 8;
1226 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1227 if (!x->ealg) {
1228 err = -ENOMEM;
1229 goto out;
1230 }
1231 strcpy(x->ealg->alg_name, a->name);
1232 x->ealg->alg_key_len = 0;
1233 if (key) {
1234 x->ealg->alg_key_len = key->sadb_key_bits;
1235 memcpy(x->ealg->alg_key, key+1, keysize);
1236 }
1237 x->props.ealgo = sa->sadb_sa_encrypt;
1238 x->geniv = a->uinfo.encr.geniv;
1239 }
1240 }
1241 /* x->algo.flags = sa->sadb_sa_flags; */
1242
1243 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1244 &x->props.saddr);
1245 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1246 &x->id.daddr);
1247
1248 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1249 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1250 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1251 if (mode < 0) {
1252 err = -EINVAL;
1253 goto out;
1254 }
1255 x->props.mode = mode;
1256 x->props.reqid = sa2->sadb_x_sa2_reqid;
1257 }
1258
1259 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1260 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1261
1262 /* Nobody uses this, but we try. */
1263 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1264 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1265 }
1266
1267 if (!x->sel.family)
1268 x->sel.family = x->props.family;
1269
1270 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1271 const struct sadb_x_nat_t_type* n_type;
1272 struct xfrm_encap_tmpl *natt;
1273
1274 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1275 if (!x->encap) {
1276 err = -ENOMEM;
1277 goto out;
1278 }
1279
1280 natt = x->encap;
1281 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1282 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1283
1284 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1285 const struct sadb_x_nat_t_port *n_port =
1286 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1287 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1288 }
1289 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1290 const struct sadb_x_nat_t_port *n_port =
1291 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1292 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1293 }
1294 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1295 }
1296
1297 err = xfrm_init_state(x);
1298 if (err)
1299 goto out;
1300
1301 x->km.seq = hdr->sadb_msg_seq;
1302 return x;
1303
1304 out:
1305 x->km.state = XFRM_STATE_DEAD;
1306 xfrm_state_put(x);
1307 return ERR_PTR(err);
1308 }
1309
1310 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1311 {
1312 return -EOPNOTSUPP;
1313 }
1314
1315 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1316 {
1317 struct net *net = sock_net(sk);
1318 struct sk_buff *resp_skb;
1319 struct sadb_x_sa2 *sa2;
1320 struct sadb_address *saddr, *daddr;
1321 struct sadb_msg *out_hdr;
1322 struct sadb_spirange *range;
1323 struct xfrm_state *x = NULL;
1324 int mode;
1325 int err;
1326 u32 min_spi, max_spi;
1327 u32 reqid;
1328 u8 proto;
1329 unsigned short family;
1330 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1331
1332 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1333 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1334 return -EINVAL;
1335
1336 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1337 if (proto == 0)
1338 return -EINVAL;
1339
1340 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1341 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1342 if (mode < 0)
1343 return -EINVAL;
1344 reqid = sa2->sadb_x_sa2_reqid;
1345 } else {
1346 mode = 0;
1347 reqid = 0;
1348 }
1349
1350 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1351 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1352
1353 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1354 switch (family) {
1355 case AF_INET:
1356 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1357 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1358 break;
1359 #if IS_ENABLED(CONFIG_IPV6)
1360 case AF_INET6:
1361 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1362 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1363 break;
1364 #endif
1365 }
1366
1367 if (hdr->sadb_msg_seq) {
1368 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1369 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1370 xfrm_state_put(x);
1371 x = NULL;
1372 }
1373 }
1374
1375 if (!x)
1376 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1377
1378 if (x == NULL)
1379 return -ENOENT;
1380
1381 min_spi = 0x100;
1382 max_spi = 0x0fffffff;
1383
1384 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1385 if (range) {
1386 min_spi = range->sadb_spirange_min;
1387 max_spi = range->sadb_spirange_max;
1388 }
1389
1390 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1391 if (err) {
1392 xfrm_state_put(x);
1393 return err;
1394 }
1395
1396 err = xfrm_alloc_spi(x, min_spi, max_spi);
1397 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1398
1399 if (IS_ERR(resp_skb)) {
1400 xfrm_state_put(x);
1401 return PTR_ERR(resp_skb);
1402 }
1403
1404 out_hdr = (struct sadb_msg *) resp_skb->data;
1405 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1406 out_hdr->sadb_msg_type = SADB_GETSPI;
1407 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1408 out_hdr->sadb_msg_errno = 0;
1409 out_hdr->sadb_msg_reserved = 0;
1410 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1411 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1412
1413 xfrm_state_put(x);
1414
1415 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1416
1417 return 0;
1418 }
1419
1420 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1421 {
1422 struct net *net = sock_net(sk);
1423 struct xfrm_state *x;
1424
1425 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1426 return -EOPNOTSUPP;
1427
1428 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1429 return 0;
1430
1431 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1432 if (x == NULL)
1433 return 0;
1434
1435 spin_lock_bh(&x->lock);
1436 if (x->km.state == XFRM_STATE_ACQ)
1437 x->km.state = XFRM_STATE_ERROR;
1438
1439 spin_unlock_bh(&x->lock);
1440 xfrm_state_put(x);
1441 return 0;
1442 }
1443
1444 static inline int event2poltype(int event)
1445 {
1446 switch (event) {
1447 case XFRM_MSG_DELPOLICY:
1448 return SADB_X_SPDDELETE;
1449 case XFRM_MSG_NEWPOLICY:
1450 return SADB_X_SPDADD;
1451 case XFRM_MSG_UPDPOLICY:
1452 return SADB_X_SPDUPDATE;
1453 case XFRM_MSG_POLEXPIRE:
1454 // return SADB_X_SPDEXPIRE;
1455 default:
1456 pr_err("pfkey: Unknown policy event %d\n", event);
1457 break;
1458 }
1459
1460 return 0;
1461 }
1462
1463 static inline int event2keytype(int event)
1464 {
1465 switch (event) {
1466 case XFRM_MSG_DELSA:
1467 return SADB_DELETE;
1468 case XFRM_MSG_NEWSA:
1469 return SADB_ADD;
1470 case XFRM_MSG_UPDSA:
1471 return SADB_UPDATE;
1472 case XFRM_MSG_EXPIRE:
1473 return SADB_EXPIRE;
1474 default:
1475 pr_err("pfkey: Unknown SA event %d\n", event);
1476 break;
1477 }
1478
1479 return 0;
1480 }
1481
1482 /* ADD/UPD/DEL */
1483 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1484 {
1485 struct sk_buff *skb;
1486 struct sadb_msg *hdr;
1487
1488 skb = pfkey_xfrm_state2msg(x);
1489
1490 if (IS_ERR(skb))
1491 return PTR_ERR(skb);
1492
1493 hdr = (struct sadb_msg *) skb->data;
1494 hdr->sadb_msg_version = PF_KEY_V2;
1495 hdr->sadb_msg_type = event2keytype(c->event);
1496 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1497 hdr->sadb_msg_errno = 0;
1498 hdr->sadb_msg_reserved = 0;
1499 hdr->sadb_msg_seq = c->seq;
1500 hdr->sadb_msg_pid = c->portid;
1501
1502 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1503
1504 return 0;
1505 }
1506
1507 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1508 {
1509 struct net *net = sock_net(sk);
1510 struct xfrm_state *x;
1511 int err;
1512 struct km_event c;
1513
1514 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1515 if (IS_ERR(x))
1516 return PTR_ERR(x);
1517
1518 xfrm_state_hold(x);
1519 if (hdr->sadb_msg_type == SADB_ADD)
1520 err = xfrm_state_add(x);
1521 else
1522 err = xfrm_state_update(x);
1523
1524 xfrm_audit_state_add(x, err ? 0 : 1, true);
1525
1526 if (err < 0) {
1527 x->km.state = XFRM_STATE_DEAD;
1528 __xfrm_state_put(x);
1529 goto out;
1530 }
1531
1532 if (hdr->sadb_msg_type == SADB_ADD)
1533 c.event = XFRM_MSG_NEWSA;
1534 else
1535 c.event = XFRM_MSG_UPDSA;
1536 c.seq = hdr->sadb_msg_seq;
1537 c.portid = hdr->sadb_msg_pid;
1538 km_state_notify(x, &c);
1539 out:
1540 xfrm_state_put(x);
1541 return err;
1542 }
1543
1544 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1545 {
1546 struct net *net = sock_net(sk);
1547 struct xfrm_state *x;
1548 struct km_event c;
1549 int err;
1550
1551 if (!ext_hdrs[SADB_EXT_SA-1] ||
1552 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1553 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1554 return -EINVAL;
1555
1556 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1557 if (x == NULL)
1558 return -ESRCH;
1559
1560 if ((err = security_xfrm_state_delete(x)))
1561 goto out;
1562
1563 if (xfrm_state_kern(x)) {
1564 err = -EPERM;
1565 goto out;
1566 }
1567
1568 err = xfrm_state_delete(x);
1569
1570 if (err < 0)
1571 goto out;
1572
1573 c.seq = hdr->sadb_msg_seq;
1574 c.portid = hdr->sadb_msg_pid;
1575 c.event = XFRM_MSG_DELSA;
1576 km_state_notify(x, &c);
1577 out:
1578 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1579 xfrm_state_put(x);
1580
1581 return err;
1582 }
1583
1584 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1585 {
1586 struct net *net = sock_net(sk);
1587 __u8 proto;
1588 struct sk_buff *out_skb;
1589 struct sadb_msg *out_hdr;
1590 struct xfrm_state *x;
1591
1592 if (!ext_hdrs[SADB_EXT_SA-1] ||
1593 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1594 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1595 return -EINVAL;
1596
1597 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1598 if (x == NULL)
1599 return -ESRCH;
1600
1601 out_skb = pfkey_xfrm_state2msg(x);
1602 proto = x->id.proto;
1603 xfrm_state_put(x);
1604 if (IS_ERR(out_skb))
1605 return PTR_ERR(out_skb);
1606
1607 out_hdr = (struct sadb_msg *) out_skb->data;
1608 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1609 out_hdr->sadb_msg_type = SADB_GET;
1610 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1611 out_hdr->sadb_msg_errno = 0;
1612 out_hdr->sadb_msg_reserved = 0;
1613 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1614 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1615 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1616
1617 return 0;
1618 }
1619
1620 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1621 gfp_t allocation)
1622 {
1623 struct sk_buff *skb;
1624 struct sadb_msg *hdr;
1625 int len, auth_len, enc_len, i;
1626
1627 auth_len = xfrm_count_pfkey_auth_supported();
1628 if (auth_len) {
1629 auth_len *= sizeof(struct sadb_alg);
1630 auth_len += sizeof(struct sadb_supported);
1631 }
1632
1633 enc_len = xfrm_count_pfkey_enc_supported();
1634 if (enc_len) {
1635 enc_len *= sizeof(struct sadb_alg);
1636 enc_len += sizeof(struct sadb_supported);
1637 }
1638
1639 len = enc_len + auth_len + sizeof(struct sadb_msg);
1640
1641 skb = alloc_skb(len + 16, allocation);
1642 if (!skb)
1643 goto out_put_algs;
1644
1645 hdr = skb_put(skb, sizeof(*hdr));
1646 pfkey_hdr_dup(hdr, orig);
1647 hdr->sadb_msg_errno = 0;
1648 hdr->sadb_msg_len = len / sizeof(uint64_t);
1649
1650 if (auth_len) {
1651 struct sadb_supported *sp;
1652 struct sadb_alg *ap;
1653
1654 sp = skb_put(skb, auth_len);
1655 ap = (struct sadb_alg *) (sp + 1);
1656
1657 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1658 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1659
1660 for (i = 0; ; i++) {
1661 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1662 if (!aalg)
1663 break;
1664 if (!aalg->pfkey_supported)
1665 continue;
1666 if (aalg->available)
1667 *ap++ = aalg->desc;
1668 }
1669 }
1670
1671 if (enc_len) {
1672 struct sadb_supported *sp;
1673 struct sadb_alg *ap;
1674
1675 sp = skb_put(skb, enc_len);
1676 ap = (struct sadb_alg *) (sp + 1);
1677
1678 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1679 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1680
1681 for (i = 0; ; i++) {
1682 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1683 if (!ealg)
1684 break;
1685 if (!ealg->pfkey_supported)
1686 continue;
1687 if (ealg->available)
1688 *ap++ = ealg->desc;
1689 }
1690 }
1691
1692 out_put_algs:
1693 return skb;
1694 }
1695
1696 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1697 {
1698 struct pfkey_sock *pfk = pfkey_sk(sk);
1699 struct sk_buff *supp_skb;
1700
1701 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1702 return -EINVAL;
1703
1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1705 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1706 return -EEXIST;
1707 pfk->registered |= (1<<hdr->sadb_msg_satype);
1708 }
1709
1710 xfrm_probe_algs();
1711
1712 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1713 if (!supp_skb) {
1714 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1715 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1716
1717 return -ENOBUFS;
1718 }
1719
1720 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1721 sock_net(sk));
1722 return 0;
1723 }
1724
1725 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1726 {
1727 struct sk_buff *skb;
1728 struct sadb_msg *hdr;
1729
1730 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1731 if (!skb)
1732 return -ENOBUFS;
1733
1734 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1735 hdr->sadb_msg_errno = (uint8_t) 0;
1736 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1737
1738 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1739 sock_net(sk));
1740 }
1741
1742 static int key_notify_sa_flush(const struct km_event *c)
1743 {
1744 struct sk_buff *skb;
1745 struct sadb_msg *hdr;
1746
1747 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1748 if (!skb)
1749 return -ENOBUFS;
1750 hdr = skb_put(skb, sizeof(struct sadb_msg));
1751 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1752 hdr->sadb_msg_type = SADB_FLUSH;
1753 hdr->sadb_msg_seq = c->seq;
1754 hdr->sadb_msg_pid = c->portid;
1755 hdr->sadb_msg_version = PF_KEY_V2;
1756 hdr->sadb_msg_errno = (uint8_t) 0;
1757 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1758 hdr->sadb_msg_reserved = 0;
1759
1760 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1761
1762 return 0;
1763 }
1764
1765 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1766 {
1767 struct net *net = sock_net(sk);
1768 unsigned int proto;
1769 struct km_event c;
1770 int err, err2;
1771
1772 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1773 if (proto == 0)
1774 return -EINVAL;
1775
1776 err = xfrm_state_flush(net, proto, true, false);
1777 err2 = unicast_flush_resp(sk, hdr);
1778 if (err || err2) {
1779 if (err == -ESRCH) /* empty table - go quietly */
1780 err = 0;
1781 return err ? err : err2;
1782 }
1783
1784 c.data.proto = proto;
1785 c.seq = hdr->sadb_msg_seq;
1786 c.portid = hdr->sadb_msg_pid;
1787 c.event = XFRM_MSG_FLUSHSA;
1788 c.net = net;
1789 km_state_notify(NULL, &c);
1790
1791 return 0;
1792 }
1793
1794 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1795 {
1796 struct pfkey_sock *pfk = ptr;
1797 struct sk_buff *out_skb;
1798 struct sadb_msg *out_hdr;
1799
1800 if (!pfkey_can_dump(&pfk->sk))
1801 return -ENOBUFS;
1802
1803 out_skb = pfkey_xfrm_state2msg(x);
1804 if (IS_ERR(out_skb))
1805 return PTR_ERR(out_skb);
1806
1807 out_hdr = (struct sadb_msg *) out_skb->data;
1808 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1809 out_hdr->sadb_msg_type = SADB_DUMP;
1810 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1811 out_hdr->sadb_msg_errno = 0;
1812 out_hdr->sadb_msg_reserved = 0;
1813 out_hdr->sadb_msg_seq = count + 1;
1814 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1815
1816 if (pfk->dump.skb)
1817 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1818 &pfk->sk, sock_net(&pfk->sk));
1819 pfk->dump.skb = out_skb;
1820
1821 return 0;
1822 }
1823
1824 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1825 {
1826 struct net *net = sock_net(&pfk->sk);
1827 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1828 }
1829
1830 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1831 {
1832 struct net *net = sock_net(&pfk->sk);
1833
1834 xfrm_state_walk_done(&pfk->dump.u.state, net);
1835 }
1836
1837 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1838 {
1839 u8 proto;
1840 struct xfrm_address_filter *filter = NULL;
1841 struct pfkey_sock *pfk = pfkey_sk(sk);
1842
1843 mutex_lock(&pfk->dump_lock);
1844 if (pfk->dump.dump != NULL) {
1845 mutex_unlock(&pfk->dump_lock);
1846 return -EBUSY;
1847 }
1848
1849 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1850 if (proto == 0) {
1851 mutex_unlock(&pfk->dump_lock);
1852 return -EINVAL;
1853 }
1854
1855 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1856 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1857
1858 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1859 if (filter == NULL) {
1860 mutex_unlock(&pfk->dump_lock);
1861 return -ENOMEM;
1862 }
1863
1864 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1865 sizeof(xfrm_address_t));
1866 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1867 sizeof(xfrm_address_t));
1868 filter->family = xfilter->sadb_x_filter_family;
1869 filter->splen = xfilter->sadb_x_filter_splen;
1870 filter->dplen = xfilter->sadb_x_filter_dplen;
1871 }
1872
1873 pfk->dump.msg_version = hdr->sadb_msg_version;
1874 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1875 pfk->dump.dump = pfkey_dump_sa;
1876 pfk->dump.done = pfkey_dump_sa_done;
1877 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1878 mutex_unlock(&pfk->dump_lock);
1879
1880 return pfkey_do_dump(pfk);
1881 }
1882
1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1884 {
1885 struct pfkey_sock *pfk = pfkey_sk(sk);
1886 int satype = hdr->sadb_msg_satype;
1887 bool reset_errno = false;
1888
1889 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1890 reset_errno = true;
1891 if (satype != 0 && satype != 1)
1892 return -EINVAL;
1893 pfk->promisc = satype;
1894 }
1895 if (reset_errno && skb_cloned(skb))
1896 skb = skb_copy(skb, GFP_KERNEL);
1897 else
1898 skb = skb_clone(skb, GFP_KERNEL);
1899
1900 if (reset_errno && skb) {
1901 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1902 new_hdr->sadb_msg_errno = 0;
1903 }
1904
1905 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1906 return 0;
1907 }
1908
1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1910 {
1911 int i;
1912 u32 reqid = *(u32*)ptr;
1913
1914 for (i=0; i<xp->xfrm_nr; i++) {
1915 if (xp->xfrm_vec[i].reqid == reqid)
1916 return -EEXIST;
1917 }
1918 return 0;
1919 }
1920
1921 static u32 gen_reqid(struct net *net)
1922 {
1923 struct xfrm_policy_walk walk;
1924 u32 start;
1925 int rc;
1926 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1927
1928 start = reqid;
1929 do {
1930 ++reqid;
1931 if (reqid == 0)
1932 reqid = IPSEC_MANUAL_REQID_MAX+1;
1933 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1934 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1935 xfrm_policy_walk_done(&walk, net);
1936 if (rc != -EEXIST)
1937 return reqid;
1938 } while (reqid != start);
1939 return 0;
1940 }
1941
1942 static int
1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1944 {
1945 struct net *net = xp_net(xp);
1946 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947 int mode;
1948
1949 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950 return -ELOOP;
1951
1952 if (rq->sadb_x_ipsecrequest_mode == 0)
1953 return -EINVAL;
1954 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955 return -EINVAL;
1956
1957 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959 return -EINVAL;
1960 t->mode = mode;
1961 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1962 t->optional = 1;
1963 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1964 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1965 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1966 t->reqid = 0;
1967 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1968 return -ENOBUFS;
1969 }
1970
1971 /* addresses present only in tunnel mode */
1972 if (t->mode == XFRM_MODE_TUNNEL) {
1973 int err;
1974
1975 err = parse_sockaddr_pair(
1976 (struct sockaddr *)(rq + 1),
1977 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1978 &t->saddr, &t->id.daddr, &t->encap_family);
1979 if (err)
1980 return err;
1981 } else
1982 t->encap_family = xp->family;
1983
1984 /* No way to set this via kame pfkey */
1985 t->allalgs = 1;
1986 xp->xfrm_nr++;
1987 return 0;
1988 }
1989
1990 static int
1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1992 {
1993 int err;
1994 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1995 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1996
1997 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1998 return -EINVAL;
1999
2000 while (len >= sizeof(*rq)) {
2001 if (len < rq->sadb_x_ipsecrequest_len ||
2002 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2003 return -EINVAL;
2004
2005 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2006 return err;
2007 len -= rq->sadb_x_ipsecrequest_len;
2008 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2009 }
2010 return 0;
2011 }
2012
2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2014 {
2015 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2016
2017 if (xfrm_ctx) {
2018 int len = sizeof(struct sadb_x_sec_ctx);
2019 len += xfrm_ctx->ctx_len;
2020 return PFKEY_ALIGN8(len);
2021 }
2022 return 0;
2023 }
2024
2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2026 {
2027 const struct xfrm_tmpl *t;
2028 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2029 int socklen = 0;
2030 int i;
2031
2032 for (i=0; i<xp->xfrm_nr; i++) {
2033 t = xp->xfrm_vec + i;
2034 socklen += pfkey_sockaddr_len(t->encap_family);
2035 }
2036
2037 return sizeof(struct sadb_msg) +
2038 (sizeof(struct sadb_lifetime) * 3) +
2039 (sizeof(struct sadb_address) * 2) +
2040 (sockaddr_size * 2) +
2041 sizeof(struct sadb_x_policy) +
2042 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2043 (socklen * 2) +
2044 pfkey_xfrm_policy2sec_ctx_size(xp);
2045 }
2046
2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2048 {
2049 struct sk_buff *skb;
2050 int size;
2051
2052 size = pfkey_xfrm_policy2msg_size(xp);
2053
2054 skb = alloc_skb(size + 16, GFP_ATOMIC);
2055 if (skb == NULL)
2056 return ERR_PTR(-ENOBUFS);
2057
2058 return skb;
2059 }
2060
2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2062 {
2063 struct sadb_msg *hdr;
2064 struct sadb_address *addr;
2065 struct sadb_lifetime *lifetime;
2066 struct sadb_x_policy *pol;
2067 struct sadb_x_sec_ctx *sec_ctx;
2068 struct xfrm_sec_ctx *xfrm_ctx;
2069 int i;
2070 int size;
2071 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2072 int socklen = pfkey_sockaddr_len(xp->family);
2073
2074 size = pfkey_xfrm_policy2msg_size(xp);
2075
2076 /* call should fill header later */
2077 hdr = skb_put(skb, sizeof(struct sadb_msg));
2078 memset(hdr, 0, size); /* XXX do we need this ? */
2079
2080 /* src address */
2081 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2082 addr->sadb_address_len =
2083 (sizeof(struct sadb_address)+sockaddr_size)/
2084 sizeof(uint64_t);
2085 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2086 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2087 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2088 addr->sadb_address_reserved = 0;
2089 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2090 xp->selector.sport,
2091 (struct sockaddr *) (addr + 1),
2092 xp->family))
2093 BUG();
2094
2095 /* dst address */
2096 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2097 addr->sadb_address_len =
2098 (sizeof(struct sadb_address)+sockaddr_size)/
2099 sizeof(uint64_t);
2100 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2101 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2102 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2103 addr->sadb_address_reserved = 0;
2104
2105 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2106 (struct sockaddr *) (addr + 1),
2107 xp->family);
2108
2109 /* hard time */
2110 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2111 lifetime->sadb_lifetime_len =
2112 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2113 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2114 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2115 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2116 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2117 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2118 /* soft time */
2119 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2120 lifetime->sadb_lifetime_len =
2121 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2122 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2123 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2124 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2125 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2126 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2127 /* current time */
2128 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2129 lifetime->sadb_lifetime_len =
2130 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2131 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2132 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2133 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2134 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2135 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2136
2137 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2138 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2139 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2140 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2141 if (xp->action == XFRM_POLICY_ALLOW) {
2142 if (xp->xfrm_nr)
2143 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2144 else
2145 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2146 }
2147 pol->sadb_x_policy_dir = dir+1;
2148 pol->sadb_x_policy_reserved = 0;
2149 pol->sadb_x_policy_id = xp->index;
2150 pol->sadb_x_policy_priority = xp->priority;
2151
2152 for (i=0; i<xp->xfrm_nr; i++) {
2153 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2154 struct sadb_x_ipsecrequest *rq;
2155 int req_size;
2156 int mode;
2157
2158 req_size = sizeof(struct sadb_x_ipsecrequest);
2159 if (t->mode == XFRM_MODE_TUNNEL) {
2160 socklen = pfkey_sockaddr_len(t->encap_family);
2161 req_size += socklen * 2;
2162 } else {
2163 size -= 2*socklen;
2164 }
2165 rq = skb_put(skb, req_size);
2166 pol->sadb_x_policy_len += req_size/8;
2167 memset(rq, 0, sizeof(*rq));
2168 rq->sadb_x_ipsecrequest_len = req_size;
2169 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2170 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2171 return -EINVAL;
2172 rq->sadb_x_ipsecrequest_mode = mode;
2173 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2174 if (t->reqid)
2175 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2176 if (t->optional)
2177 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2178 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2179
2180 if (t->mode == XFRM_MODE_TUNNEL) {
2181 u8 *sa = (void *)(rq + 1);
2182 pfkey_sockaddr_fill(&t->saddr, 0,
2183 (struct sockaddr *)sa,
2184 t->encap_family);
2185 pfkey_sockaddr_fill(&t->id.daddr, 0,
2186 (struct sockaddr *) (sa + socklen),
2187 t->encap_family);
2188 }
2189 }
2190
2191 /* security context */
2192 if ((xfrm_ctx = xp->security)) {
2193 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2194
2195 sec_ctx = skb_put(skb, ctx_size);
2196 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2197 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2198 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2199 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2200 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2201 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2202 xfrm_ctx->ctx_len);
2203 }
2204
2205 hdr->sadb_msg_len = size / sizeof(uint64_t);
2206 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2207
2208 return 0;
2209 }
2210
2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2212 {
2213 struct sk_buff *out_skb;
2214 struct sadb_msg *out_hdr;
2215 int err;
2216
2217 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2218 if (IS_ERR(out_skb))
2219 return PTR_ERR(out_skb);
2220
2221 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2222 if (err < 0) {
2223 kfree_skb(out_skb);
2224 return err;
2225 }
2226
2227 out_hdr = (struct sadb_msg *) out_skb->data;
2228 out_hdr->sadb_msg_version = PF_KEY_V2;
2229
2230 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2231 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2232 else
2233 out_hdr->sadb_msg_type = event2poltype(c->event);
2234 out_hdr->sadb_msg_errno = 0;
2235 out_hdr->sadb_msg_seq = c->seq;
2236 out_hdr->sadb_msg_pid = c->portid;
2237 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2238 return 0;
2239
2240 }
2241
2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2243 {
2244 struct net *net = sock_net(sk);
2245 int err = 0;
2246 struct sadb_lifetime *lifetime;
2247 struct sadb_address *sa;
2248 struct sadb_x_policy *pol;
2249 struct xfrm_policy *xp;
2250 struct km_event c;
2251 struct sadb_x_sec_ctx *sec_ctx;
2252
2253 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2254 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2255 !ext_hdrs[SADB_X_EXT_POLICY-1])
2256 return -EINVAL;
2257
2258 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2259 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2260 return -EINVAL;
2261 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2262 return -EINVAL;
2263
2264 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2265 if (xp == NULL)
2266 return -ENOBUFS;
2267
2268 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2269 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2270 xp->priority = pol->sadb_x_policy_priority;
2271
2272 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2273 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2274 xp->selector.family = xp->family;
2275 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2276 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2277 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2278 if (xp->selector.sport)
2279 xp->selector.sport_mask = htons(0xffff);
2280
2281 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2282 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2283 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2284
2285 /* Amusing, we set this twice. KAME apps appear to set same value
2286 * in both addresses.
2287 */
2288 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2289
2290 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2291 if (xp->selector.dport)
2292 xp->selector.dport_mask = htons(0xffff);
2293
2294 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2295 if (sec_ctx != NULL) {
2296 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2297
2298 if (!uctx) {
2299 err = -ENOBUFS;
2300 goto out;
2301 }
2302
2303 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2304 kfree(uctx);
2305
2306 if (err)
2307 goto out;
2308 }
2309
2310 xp->lft.soft_byte_limit = XFRM_INF;
2311 xp->lft.hard_byte_limit = XFRM_INF;
2312 xp->lft.soft_packet_limit = XFRM_INF;
2313 xp->lft.hard_packet_limit = XFRM_INF;
2314 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2315 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2316 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2317 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2318 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2319 }
2320 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2321 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2322 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2323 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2324 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2325 }
2326 xp->xfrm_nr = 0;
2327 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2328 (err = parse_ipsecrequests(xp, pol)) < 0)
2329 goto out;
2330
2331 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2332 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2333
2334 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2335
2336 if (err)
2337 goto out;
2338
2339 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2340 c.event = XFRM_MSG_UPDPOLICY;
2341 else
2342 c.event = XFRM_MSG_NEWPOLICY;
2343
2344 c.seq = hdr->sadb_msg_seq;
2345 c.portid = hdr->sadb_msg_pid;
2346
2347 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2348 xfrm_pol_put(xp);
2349 return 0;
2350
2351 out:
2352 xp->walk.dead = 1;
2353 xfrm_policy_destroy(xp);
2354 return err;
2355 }
2356
2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2358 {
2359 struct net *net = sock_net(sk);
2360 int err;
2361 struct sadb_address *sa;
2362 struct sadb_x_policy *pol;
2363 struct xfrm_policy *xp;
2364 struct xfrm_selector sel;
2365 struct km_event c;
2366 struct sadb_x_sec_ctx *sec_ctx;
2367 struct xfrm_sec_ctx *pol_ctx = NULL;
2368
2369 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2370 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2371 !ext_hdrs[SADB_X_EXT_POLICY-1])
2372 return -EINVAL;
2373
2374 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2375 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2376 return -EINVAL;
2377
2378 memset(&sel, 0, sizeof(sel));
2379
2380 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2381 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2382 sel.prefixlen_s = sa->sadb_address_prefixlen;
2383 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2384 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2385 if (sel.sport)
2386 sel.sport_mask = htons(0xffff);
2387
2388 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2389 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2390 sel.prefixlen_d = sa->sadb_address_prefixlen;
2391 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393 if (sel.dport)
2394 sel.dport_mask = htons(0xffff);
2395
2396 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2397 if (sec_ctx != NULL) {
2398 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2399
2400 if (!uctx)
2401 return -ENOMEM;
2402
2403 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2404 kfree(uctx);
2405 if (err)
2406 return err;
2407 }
2408
2409 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2410 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2411 1, &err);
2412 security_xfrm_policy_free(pol_ctx);
2413 if (xp == NULL)
2414 return -ENOENT;
2415
2416 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2417
2418 if (err)
2419 goto out;
2420
2421 c.seq = hdr->sadb_msg_seq;
2422 c.portid = hdr->sadb_msg_pid;
2423 c.data.byid = 0;
2424 c.event = XFRM_MSG_DELPOLICY;
2425 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2426
2427 out:
2428 xfrm_pol_put(xp);
2429 return err;
2430 }
2431
2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2433 {
2434 int err;
2435 struct sk_buff *out_skb;
2436 struct sadb_msg *out_hdr;
2437 err = 0;
2438
2439 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2440 if (IS_ERR(out_skb)) {
2441 err = PTR_ERR(out_skb);
2442 goto out;
2443 }
2444 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2445 if (err < 0)
2446 goto out;
2447
2448 out_hdr = (struct sadb_msg *) out_skb->data;
2449 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2450 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2451 out_hdr->sadb_msg_satype = 0;
2452 out_hdr->sadb_msg_errno = 0;
2453 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2454 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2455 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2456 err = 0;
2457
2458 out:
2459 return err;
2460 }
2461
2462 static int pfkey_sockaddr_pair_size(sa_family_t family)
2463 {
2464 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2465 }
2466
2467 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2468 xfrm_address_t *saddr, xfrm_address_t *daddr,
2469 u16 *family)
2470 {
2471 int af, socklen;
2472
2473 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2474 return -EINVAL;
2475
2476 af = pfkey_sockaddr_extract(sa, saddr);
2477 if (!af)
2478 return -EINVAL;
2479
2480 socklen = pfkey_sockaddr_len(af);
2481 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2482 daddr) != af)
2483 return -EINVAL;
2484
2485 *family = af;
2486 return 0;
2487 }
2488
2489 #ifdef CONFIG_NET_KEY_MIGRATE
2490 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2491 struct xfrm_migrate *m)
2492 {
2493 int err;
2494 struct sadb_x_ipsecrequest *rq2;
2495 int mode;
2496
2497 if (len < sizeof(*rq1) ||
2498 len < rq1->sadb_x_ipsecrequest_len ||
2499 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2500 return -EINVAL;
2501
2502 /* old endoints */
2503 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2504 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2505 &m->old_saddr, &m->old_daddr,
2506 &m->old_family);
2507 if (err)
2508 return err;
2509
2510 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2511 len -= rq1->sadb_x_ipsecrequest_len;
2512
2513 if (len <= sizeof(*rq2) ||
2514 len < rq2->sadb_x_ipsecrequest_len ||
2515 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2516 return -EINVAL;
2517
2518 /* new endpoints */
2519 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2520 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2521 &m->new_saddr, &m->new_daddr,
2522 &m->new_family);
2523 if (err)
2524 return err;
2525
2526 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2527 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2528 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2529 return -EINVAL;
2530
2531 m->proto = rq1->sadb_x_ipsecrequest_proto;
2532 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2533 return -EINVAL;
2534 m->mode = mode;
2535 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2536
2537 return ((int)(rq1->sadb_x_ipsecrequest_len +
2538 rq2->sadb_x_ipsecrequest_len));
2539 }
2540
2541 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2542 const struct sadb_msg *hdr, void * const *ext_hdrs)
2543 {
2544 int i, len, ret, err = -EINVAL;
2545 u8 dir;
2546 struct sadb_address *sa;
2547 struct sadb_x_kmaddress *kma;
2548 struct sadb_x_policy *pol;
2549 struct sadb_x_ipsecrequest *rq;
2550 struct xfrm_selector sel;
2551 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2552 struct xfrm_kmaddress k;
2553 struct net *net = sock_net(sk);
2554
2555 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2556 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2557 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2558 err = -EINVAL;
2559 goto out;
2560 }
2561
2562 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2563 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2564
2565 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2566 err = -EINVAL;
2567 goto out;
2568 }
2569
2570 if (kma) {
2571 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2572 k.reserved = kma->sadb_x_kmaddress_reserved;
2573 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2574 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2575 &k.local, &k.remote, &k.family);
2576 if (ret < 0) {
2577 err = ret;
2578 goto out;
2579 }
2580 }
2581
2582 dir = pol->sadb_x_policy_dir - 1;
2583 memset(&sel, 0, sizeof(sel));
2584
2585 /* set source address info of selector */
2586 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2587 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2588 sel.prefixlen_s = sa->sadb_address_prefixlen;
2589 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2590 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2591 if (sel.sport)
2592 sel.sport_mask = htons(0xffff);
2593
2594 /* set destination address info of selector */
2595 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2596 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2597 sel.prefixlen_d = sa->sadb_address_prefixlen;
2598 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2599 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2600 if (sel.dport)
2601 sel.dport_mask = htons(0xffff);
2602
2603 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2604
2605 /* extract ipsecrequests */
2606 i = 0;
2607 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2608
2609 while (len > 0 && i < XFRM_MAX_DEPTH) {
2610 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2611 if (ret < 0) {
2612 err = ret;
2613 goto out;
2614 } else {
2615 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2616 len -= ret;
2617 i++;
2618 }
2619 }
2620
2621 if (!i || len > 0) {
2622 err = -EINVAL;
2623 goto out;
2624 }
2625
2626 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2627 kma ? &k : NULL, net, NULL);
2628
2629 out:
2630 return err;
2631 }
2632 #else
2633 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2634 const struct sadb_msg *hdr, void * const *ext_hdrs)
2635 {
2636 return -ENOPROTOOPT;
2637 }
2638 #endif
2639
2640
2641 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2642 {
2643 struct net *net = sock_net(sk);
2644 unsigned int dir;
2645 int err = 0, delete;
2646 struct sadb_x_policy *pol;
2647 struct xfrm_policy *xp;
2648 struct km_event c;
2649
2650 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2651 return -EINVAL;
2652
2653 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2654 if (dir >= XFRM_POLICY_MAX)
2655 return -EINVAL;
2656
2657 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2658 xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2659 dir, pol->sadb_x_policy_id, delete, &err);
2660 if (xp == NULL)
2661 return -ENOENT;
2662
2663 if (delete) {
2664 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2665
2666 if (err)
2667 goto out;
2668 c.seq = hdr->sadb_msg_seq;
2669 c.portid = hdr->sadb_msg_pid;
2670 c.data.byid = 1;
2671 c.event = XFRM_MSG_DELPOLICY;
2672 km_policy_notify(xp, dir, &c);
2673 } else {
2674 err = key_pol_get_resp(sk, xp, hdr, dir);
2675 }
2676
2677 out:
2678 xfrm_pol_put(xp);
2679 return err;
2680 }
2681
2682 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2683 {
2684 struct pfkey_sock *pfk = ptr;
2685 struct sk_buff *out_skb;
2686 struct sadb_msg *out_hdr;
2687 int err;
2688
2689 if (!pfkey_can_dump(&pfk->sk))
2690 return -ENOBUFS;
2691
2692 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2693 if (IS_ERR(out_skb))
2694 return PTR_ERR(out_skb);
2695
2696 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2697 if (err < 0)
2698 return err;
2699
2700 out_hdr = (struct sadb_msg *) out_skb->data;
2701 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2702 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2703 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2704 out_hdr->sadb_msg_errno = 0;
2705 out_hdr->sadb_msg_seq = count + 1;
2706 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2707
2708 if (pfk->dump.skb)
2709 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2710 &pfk->sk, sock_net(&pfk->sk));
2711 pfk->dump.skb = out_skb;
2712
2713 return 0;
2714 }
2715
2716 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2717 {
2718 struct net *net = sock_net(&pfk->sk);
2719 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2720 }
2721
2722 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2723 {
2724 struct net *net = sock_net((struct sock *)pfk);
2725
2726 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2727 }
2728
2729 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2730 {
2731 struct pfkey_sock *pfk = pfkey_sk(sk);
2732
2733 mutex_lock(&pfk->dump_lock);
2734 if (pfk->dump.dump != NULL) {
2735 mutex_unlock(&pfk->dump_lock);
2736 return -EBUSY;
2737 }
2738
2739 pfk->dump.msg_version = hdr->sadb_msg_version;
2740 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2741 pfk->dump.dump = pfkey_dump_sp;
2742 pfk->dump.done = pfkey_dump_sp_done;
2743 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2744 mutex_unlock(&pfk->dump_lock);
2745
2746 return pfkey_do_dump(pfk);
2747 }
2748
2749 static int key_notify_policy_flush(const struct km_event *c)
2750 {
2751 struct sk_buff *skb_out;
2752 struct sadb_msg *hdr;
2753
2754 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2755 if (!skb_out)
2756 return -ENOBUFS;
2757 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2758 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2759 hdr->sadb_msg_seq = c->seq;
2760 hdr->sadb_msg_pid = c->portid;
2761 hdr->sadb_msg_version = PF_KEY_V2;
2762 hdr->sadb_msg_errno = (uint8_t) 0;
2763 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2764 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2765 hdr->sadb_msg_reserved = 0;
2766 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2767 return 0;
2768
2769 }
2770
2771 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2772 {
2773 struct net *net = sock_net(sk);
2774 struct km_event c;
2775 int err, err2;
2776
2777 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2778 err2 = unicast_flush_resp(sk, hdr);
2779 if (err || err2) {
2780 if (err == -ESRCH) /* empty table - old silent behavior */
2781 return 0;
2782 return err;
2783 }
2784
2785 c.data.type = XFRM_POLICY_TYPE_MAIN;
2786 c.event = XFRM_MSG_FLUSHPOLICY;
2787 c.portid = hdr->sadb_msg_pid;
2788 c.seq = hdr->sadb_msg_seq;
2789 c.net = net;
2790 km_policy_notify(NULL, 0, &c);
2791
2792 return 0;
2793 }
2794
2795 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2796 const struct sadb_msg *hdr, void * const *ext_hdrs);
2797 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2798 [SADB_RESERVED] = pfkey_reserved,
2799 [SADB_GETSPI] = pfkey_getspi,
2800 [SADB_UPDATE] = pfkey_add,
2801 [SADB_ADD] = pfkey_add,
2802 [SADB_DELETE] = pfkey_delete,
2803 [SADB_GET] = pfkey_get,
2804 [SADB_ACQUIRE] = pfkey_acquire,
2805 [SADB_REGISTER] = pfkey_register,
2806 [SADB_EXPIRE] = NULL,
2807 [SADB_FLUSH] = pfkey_flush,
2808 [SADB_DUMP] = pfkey_dump,
2809 [SADB_X_PROMISC] = pfkey_promisc,
2810 [SADB_X_PCHANGE] = NULL,
2811 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2812 [SADB_X_SPDADD] = pfkey_spdadd,
2813 [SADB_X_SPDDELETE] = pfkey_spddelete,
2814 [SADB_X_SPDGET] = pfkey_spdget,
2815 [SADB_X_SPDACQUIRE] = NULL,
2816 [SADB_X_SPDDUMP] = pfkey_spddump,
2817 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2818 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2819 [SADB_X_SPDDELETE2] = pfkey_spdget,
2820 [SADB_X_MIGRATE] = pfkey_migrate,
2821 };
2822
2823 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2824 {
2825 void *ext_hdrs[SADB_EXT_MAX];
2826 int err;
2827
2828 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2829 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2830
2831 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2832 err = parse_exthdrs(skb, hdr, ext_hdrs);
2833 if (!err) {
2834 err = -EOPNOTSUPP;
2835 if (pfkey_funcs[hdr->sadb_msg_type])
2836 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2837 }
2838 return err;
2839 }
2840
2841 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2842 {
2843 struct sadb_msg *hdr = NULL;
2844
2845 if (skb->len < sizeof(*hdr)) {
2846 *errp = -EMSGSIZE;
2847 } else {
2848 hdr = (struct sadb_msg *) skb->data;
2849 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2850 hdr->sadb_msg_reserved != 0 ||
2851 (hdr->sadb_msg_type <= SADB_RESERVED ||
2852 hdr->sadb_msg_type > SADB_MAX)) {
2853 hdr = NULL;
2854 *errp = -EINVAL;
2855 } else if (hdr->sadb_msg_len != (skb->len /
2856 sizeof(uint64_t)) ||
2857 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2858 sizeof(uint64_t))) {
2859 hdr = NULL;
2860 *errp = -EMSGSIZE;
2861 } else {
2862 *errp = 0;
2863 }
2864 }
2865 return hdr;
2866 }
2867
2868 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2869 const struct xfrm_algo_desc *d)
2870 {
2871 unsigned int id = d->desc.sadb_alg_id;
2872
2873 if (id >= sizeof(t->aalgos) * 8)
2874 return 0;
2875
2876 return (t->aalgos >> id) & 1;
2877 }
2878
2879 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2880 const struct xfrm_algo_desc *d)
2881 {
2882 unsigned int id = d->desc.sadb_alg_id;
2883
2884 if (id >= sizeof(t->ealgos) * 8)
2885 return 0;
2886
2887 return (t->ealgos >> id) & 1;
2888 }
2889
2890 static int count_ah_combs(const struct xfrm_tmpl *t)
2891 {
2892 int i, sz = 0;
2893
2894 for (i = 0; ; i++) {
2895 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2896 if (!aalg)
2897 break;
2898 if (!aalg->pfkey_supported)
2899 continue;
2900 if (aalg_tmpl_set(t, aalg) && aalg->available)
2901 sz += sizeof(struct sadb_comb);
2902 }
2903 return sz + sizeof(struct sadb_prop);
2904 }
2905
2906 static int count_esp_combs(const struct xfrm_tmpl *t)
2907 {
2908 int i, k, sz = 0;
2909
2910 for (i = 0; ; i++) {
2911 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2912 if (!ealg)
2913 break;
2914
2915 if (!ealg->pfkey_supported)
2916 continue;
2917
2918 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2919 continue;
2920
2921 for (k = 1; ; k++) {
2922 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2923 if (!aalg)
2924 break;
2925
2926 if (!aalg->pfkey_supported)
2927 continue;
2928
2929 if (aalg_tmpl_set(t, aalg) && aalg->available)
2930 sz += sizeof(struct sadb_comb);
2931 }
2932 }
2933 return sz + sizeof(struct sadb_prop);
2934 }
2935
2936 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2937 {
2938 struct sadb_prop *p;
2939 int i;
2940
2941 p = skb_put(skb, sizeof(struct sadb_prop));
2942 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2943 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2944 p->sadb_prop_replay = 32;
2945 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2946
2947 for (i = 0; ; i++) {
2948 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2949 if (!aalg)
2950 break;
2951
2952 if (!aalg->pfkey_supported)
2953 continue;
2954
2955 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2956 struct sadb_comb *c;
2957 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2958 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2959 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2960 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2961 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2962 c->sadb_comb_hard_addtime = 24*60*60;
2963 c->sadb_comb_soft_addtime = 20*60*60;
2964 c->sadb_comb_hard_usetime = 8*60*60;
2965 c->sadb_comb_soft_usetime = 7*60*60;
2966 }
2967 }
2968 }
2969
2970 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2971 {
2972 struct sadb_prop *p;
2973 int i, k;
2974
2975 p = skb_put(skb, sizeof(struct sadb_prop));
2976 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2977 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2978 p->sadb_prop_replay = 32;
2979 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2980
2981 for (i=0; ; i++) {
2982 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2983 if (!ealg)
2984 break;
2985
2986 if (!ealg->pfkey_supported)
2987 continue;
2988
2989 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2990 continue;
2991
2992 for (k = 1; ; k++) {
2993 struct sadb_comb *c;
2994 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2995 if (!aalg)
2996 break;
2997 if (!aalg->pfkey_supported)
2998 continue;
2999 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3000 continue;
3001 c = skb_put(skb, sizeof(struct sadb_comb));
3002 memset(c, 0, sizeof(*c));
3003 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3004 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3005 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3006 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3007 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3008 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3009 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3010 c->sadb_comb_hard_addtime = 24*60*60;
3011 c->sadb_comb_soft_addtime = 20*60*60;
3012 c->sadb_comb_hard_usetime = 8*60*60;
3013 c->sadb_comb_soft_usetime = 7*60*60;
3014 }
3015 }
3016 }
3017
3018 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3019 {
3020 return 0;
3021 }
3022
3023 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3024 {
3025 struct sk_buff *out_skb;
3026 struct sadb_msg *out_hdr;
3027 int hard;
3028 int hsc;
3029
3030 hard = c->data.hard;
3031 if (hard)
3032 hsc = 2;
3033 else
3034 hsc = 1;
3035
3036 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3037 if (IS_ERR(out_skb))
3038 return PTR_ERR(out_skb);
3039
3040 out_hdr = (struct sadb_msg *) out_skb->data;
3041 out_hdr->sadb_msg_version = PF_KEY_V2;
3042 out_hdr->sadb_msg_type = SADB_EXPIRE;
3043 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3044 out_hdr->sadb_msg_errno = 0;
3045 out_hdr->sadb_msg_reserved = 0;
3046 out_hdr->sadb_msg_seq = 0;
3047 out_hdr->sadb_msg_pid = 0;
3048
3049 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3050 xs_net(x));
3051 return 0;
3052 }
3053
3054 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3055 {
3056 struct net *net = x ? xs_net(x) : c->net;
3057 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3058
3059 if (atomic_read(&net_pfkey->socks_nr) == 0)
3060 return 0;
3061
3062 switch (c->event) {
3063 case XFRM_MSG_EXPIRE:
3064 return key_notify_sa_expire(x, c);
3065 case XFRM_MSG_DELSA:
3066 case XFRM_MSG_NEWSA:
3067 case XFRM_MSG_UPDSA:
3068 return key_notify_sa(x, c);
3069 case XFRM_MSG_FLUSHSA:
3070 return key_notify_sa_flush(c);
3071 case XFRM_MSG_NEWAE: /* not yet supported */
3072 break;
3073 default:
3074 pr_err("pfkey: Unknown SA event %d\n", c->event);
3075 break;
3076 }
3077
3078 return 0;
3079 }
3080
3081 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3082 {
3083 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3084 return 0;
3085
3086 switch (c->event) {
3087 case XFRM_MSG_POLEXPIRE:
3088 return key_notify_policy_expire(xp, c);
3089 case XFRM_MSG_DELPOLICY:
3090 case XFRM_MSG_NEWPOLICY:
3091 case XFRM_MSG_UPDPOLICY:
3092 return key_notify_policy(xp, dir, c);
3093 case XFRM_MSG_FLUSHPOLICY:
3094 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3095 break;
3096 return key_notify_policy_flush(c);
3097 default:
3098 pr_err("pfkey: Unknown policy event %d\n", c->event);
3099 break;
3100 }
3101
3102 return 0;
3103 }
3104
3105 static u32 get_acqseq(void)
3106 {
3107 u32 res;
3108 static atomic_t acqseq;
3109
3110 do {
3111 res = atomic_inc_return(&acqseq);
3112 } while (!res);
3113 return res;
3114 }
3115
3116 static bool pfkey_is_alive(const struct km_event *c)
3117 {
3118 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3119 struct sock *sk;
3120 bool is_alive = false;
3121
3122 rcu_read_lock();
3123 sk_for_each_rcu(sk, &net_pfkey->table) {
3124 if (pfkey_sk(sk)->registered) {
3125 is_alive = true;
3126 break;
3127 }
3128 }
3129 rcu_read_unlock();
3130
3131 return is_alive;
3132 }
3133
3134 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3135 {
3136 struct sk_buff *skb;
3137 struct sadb_msg *hdr;
3138 struct sadb_address *addr;
3139 struct sadb_x_policy *pol;
3140 int sockaddr_size;
3141 int size;
3142 struct sadb_x_sec_ctx *sec_ctx;
3143 struct xfrm_sec_ctx *xfrm_ctx;
3144 int ctx_size = 0;
3145
3146 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3147 if (!sockaddr_size)
3148 return -EINVAL;
3149
3150 size = sizeof(struct sadb_msg) +
3151 (sizeof(struct sadb_address) * 2) +
3152 (sockaddr_size * 2) +
3153 sizeof(struct sadb_x_policy);
3154
3155 if (x->id.proto == IPPROTO_AH)
3156 size += count_ah_combs(t);
3157 else if (x->id.proto == IPPROTO_ESP)
3158 size += count_esp_combs(t);
3159
3160 if ((xfrm_ctx = x->security)) {
3161 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3162 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3163 }
3164
3165 skb = alloc_skb(size + 16, GFP_ATOMIC);
3166 if (skb == NULL)
3167 return -ENOMEM;
3168
3169 hdr = skb_put(skb, sizeof(struct sadb_msg));
3170 hdr->sadb_msg_version = PF_KEY_V2;
3171 hdr->sadb_msg_type = SADB_ACQUIRE;
3172 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3173 hdr->sadb_msg_len = size / sizeof(uint64_t);
3174 hdr->sadb_msg_errno = 0;
3175 hdr->sadb_msg_reserved = 0;
3176 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3177 hdr->sadb_msg_pid = 0;
3178
3179 /* src address */
3180 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3181 addr->sadb_address_len =
3182 (sizeof(struct sadb_address)+sockaddr_size)/
3183 sizeof(uint64_t);
3184 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3185 addr->sadb_address_proto = 0;
3186 addr->sadb_address_reserved = 0;
3187 addr->sadb_address_prefixlen =
3188 pfkey_sockaddr_fill(&x->props.saddr, 0,
3189 (struct sockaddr *) (addr + 1),
3190 x->props.family);
3191 if (!addr->sadb_address_prefixlen)
3192 BUG();
3193
3194 /* dst address */
3195 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3196 addr->sadb_address_len =
3197 (sizeof(struct sadb_address)+sockaddr_size)/
3198 sizeof(uint64_t);
3199 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3200 addr->sadb_address_proto = 0;
3201 addr->sadb_address_reserved = 0;
3202 addr->sadb_address_prefixlen =
3203 pfkey_sockaddr_fill(&x->id.daddr, 0,
3204 (struct sockaddr *) (addr + 1),
3205 x->props.family);
3206 if (!addr->sadb_address_prefixlen)
3207 BUG();
3208
3209 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3210 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3211 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3212 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3213 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3214 pol->sadb_x_policy_reserved = 0;
3215 pol->sadb_x_policy_id = xp->index;
3216 pol->sadb_x_policy_priority = xp->priority;
3217
3218 /* Set sadb_comb's. */
3219 if (x->id.proto == IPPROTO_AH)
3220 dump_ah_combs(skb, t);
3221 else if (x->id.proto == IPPROTO_ESP)
3222 dump_esp_combs(skb, t);
3223
3224 /* security context */
3225 if (xfrm_ctx) {
3226 sec_ctx = skb_put(skb,
3227 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3228 sec_ctx->sadb_x_sec_len =
3229 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3230 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3231 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3232 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3233 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3234 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3235 xfrm_ctx->ctx_len);
3236 }
3237
3238 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3239 xs_net(x));
3240 }
3241
3242 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3243 u8 *data, int len, int *dir)
3244 {
3245 struct net *net = sock_net(sk);
3246 struct xfrm_policy *xp;
3247 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3248 struct sadb_x_sec_ctx *sec_ctx;
3249
3250 switch (sk->sk_family) {
3251 case AF_INET:
3252 if (opt != IP_IPSEC_POLICY) {
3253 *dir = -EOPNOTSUPP;
3254 return NULL;
3255 }
3256 break;
3257 #if IS_ENABLED(CONFIG_IPV6)
3258 case AF_INET6:
3259 if (opt != IPV6_IPSEC_POLICY) {
3260 *dir = -EOPNOTSUPP;
3261 return NULL;
3262 }
3263 break;
3264 #endif
3265 default:
3266 *dir = -EINVAL;
3267 return NULL;
3268 }
3269
3270 *dir = -EINVAL;
3271
3272 if (len < sizeof(struct sadb_x_policy) ||
3273 pol->sadb_x_policy_len*8 > len ||
3274 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3275 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3276 return NULL;
3277
3278 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3279 if (xp == NULL) {
3280 *dir = -ENOBUFS;
3281 return NULL;
3282 }
3283
3284 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3285 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3286
3287 xp->lft.soft_byte_limit = XFRM_INF;
3288 xp->lft.hard_byte_limit = XFRM_INF;
3289 xp->lft.soft_packet_limit = XFRM_INF;
3290 xp->lft.hard_packet_limit = XFRM_INF;
3291 xp->family = sk->sk_family;
3292
3293 xp->xfrm_nr = 0;
3294 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3295 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3296 goto out;
3297
3298 /* security context too */
3299 if (len >= (pol->sadb_x_policy_len*8 +
3300 sizeof(struct sadb_x_sec_ctx))) {
3301 char *p = (char *)pol;
3302 struct xfrm_user_sec_ctx *uctx;
3303
3304 p += pol->sadb_x_policy_len*8;
3305 sec_ctx = (struct sadb_x_sec_ctx *)p;
3306 if (len < pol->sadb_x_policy_len*8 +
3307 sec_ctx->sadb_x_sec_len*8) {
3308 *dir = -EINVAL;
3309 goto out;
3310 }
3311 if ((*dir = verify_sec_ctx_len(p)))
3312 goto out;
3313 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3314 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3315 kfree(uctx);
3316
3317 if (*dir)
3318 goto out;
3319 }
3320
3321 *dir = pol->sadb_x_policy_dir-1;
3322 return xp;
3323
3324 out:
3325 xp->walk.dead = 1;
3326 xfrm_policy_destroy(xp);
3327 return NULL;
3328 }
3329
3330 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3331 {
3332 struct sk_buff *skb;
3333 struct sadb_msg *hdr;
3334 struct sadb_sa *sa;
3335 struct sadb_address *addr;
3336 struct sadb_x_nat_t_port *n_port;
3337 int sockaddr_size;
3338 int size;
3339 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3340 struct xfrm_encap_tmpl *natt = NULL;
3341
3342 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3343 if (!sockaddr_size)
3344 return -EINVAL;
3345
3346 if (!satype)
3347 return -EINVAL;
3348
3349 if (!x->encap)
3350 return -EINVAL;
3351
3352 natt = x->encap;
3353
3354 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3355 *
3356 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3357 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3358 */
3359
3360 size = sizeof(struct sadb_msg) +
3361 sizeof(struct sadb_sa) +
3362 (sizeof(struct sadb_address) * 2) +
3363 (sockaddr_size * 2) +
3364 (sizeof(struct sadb_x_nat_t_port) * 2);
3365
3366 skb = alloc_skb(size + 16, GFP_ATOMIC);
3367 if (skb == NULL)
3368 return -ENOMEM;
3369
3370 hdr = skb_put(skb, sizeof(struct sadb_msg));
3371 hdr->sadb_msg_version = PF_KEY_V2;
3372 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3373 hdr->sadb_msg_satype = satype;
3374 hdr->sadb_msg_len = size / sizeof(uint64_t);
3375 hdr->sadb_msg_errno = 0;
3376 hdr->sadb_msg_reserved = 0;
3377 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3378 hdr->sadb_msg_pid = 0;
3379
3380 /* SA */
3381 sa = skb_put(skb, sizeof(struct sadb_sa));
3382 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3383 sa->sadb_sa_exttype = SADB_EXT_SA;
3384 sa->sadb_sa_spi = x->id.spi;
3385 sa->sadb_sa_replay = 0;
3386 sa->sadb_sa_state = 0;
3387 sa->sadb_sa_auth = 0;
3388 sa->sadb_sa_encrypt = 0;
3389 sa->sadb_sa_flags = 0;
3390
3391 /* ADDRESS_SRC (old addr) */
3392 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3393 addr->sadb_address_len =
3394 (sizeof(struct sadb_address)+sockaddr_size)/
3395 sizeof(uint64_t);
3396 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3397 addr->sadb_address_proto = 0;
3398 addr->sadb_address_reserved = 0;
3399 addr->sadb_address_prefixlen =
3400 pfkey_sockaddr_fill(&x->props.saddr, 0,
3401 (struct sockaddr *) (addr + 1),
3402 x->props.family);
3403 if (!addr->sadb_address_prefixlen)
3404 BUG();
3405
3406 /* NAT_T_SPORT (old port) */
3407 n_port = skb_put(skb, sizeof(*n_port));
3408 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3409 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3410 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3411 n_port->sadb_x_nat_t_port_reserved = 0;
3412
3413 /* ADDRESS_DST (new addr) */
3414 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3415 addr->sadb_address_len =
3416 (sizeof(struct sadb_address)+sockaddr_size)/
3417 sizeof(uint64_t);
3418 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3419 addr->sadb_address_proto = 0;
3420 addr->sadb_address_reserved = 0;
3421 addr->sadb_address_prefixlen =
3422 pfkey_sockaddr_fill(ipaddr, 0,
3423 (struct sockaddr *) (addr + 1),
3424 x->props.family);
3425 if (!addr->sadb_address_prefixlen)
3426 BUG();
3427
3428 /* NAT_T_DPORT (new port) */
3429 n_port = skb_put(skb, sizeof(*n_port));
3430 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3431 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3432 n_port->sadb_x_nat_t_port_port = sport;
3433 n_port->sadb_x_nat_t_port_reserved = 0;
3434
3435 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3436 xs_net(x));
3437 }
3438
3439 #ifdef CONFIG_NET_KEY_MIGRATE
3440 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3441 const struct xfrm_selector *sel)
3442 {
3443 struct sadb_address *addr;
3444 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3445 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3446 addr->sadb_address_exttype = type;
3447 addr->sadb_address_proto = sel->proto;
3448 addr->sadb_address_reserved = 0;
3449
3450 switch (type) {
3451 case SADB_EXT_ADDRESS_SRC:
3452 addr->sadb_address_prefixlen = sel->prefixlen_s;
3453 pfkey_sockaddr_fill(&sel->saddr, 0,
3454 (struct sockaddr *)(addr + 1),
3455 sel->family);
3456 break;
3457 case SADB_EXT_ADDRESS_DST:
3458 addr->sadb_address_prefixlen = sel->prefixlen_d;
3459 pfkey_sockaddr_fill(&sel->daddr, 0,
3460 (struct sockaddr *)(addr + 1),
3461 sel->family);
3462 break;
3463 default:
3464 return -EINVAL;
3465 }
3466
3467 return 0;
3468 }
3469
3470
3471 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3472 {
3473 struct sadb_x_kmaddress *kma;
3474 u8 *sa;
3475 int family = k->family;
3476 int socklen = pfkey_sockaddr_len(family);
3477 int size_req;
3478
3479 size_req = (sizeof(struct sadb_x_kmaddress) +
3480 pfkey_sockaddr_pair_size(family));
3481
3482 kma = skb_put_zero(skb, size_req);
3483 kma->sadb_x_kmaddress_len = size_req / 8;
3484 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3485 kma->sadb_x_kmaddress_reserved = k->reserved;
3486
3487 sa = (u8 *)(kma + 1);
3488 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3489 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3490 return -EINVAL;
3491
3492 return 0;
3493 }
3494
3495 static int set_ipsecrequest(struct sk_buff *skb,
3496 uint8_t proto, uint8_t mode, int level,
3497 uint32_t reqid, uint8_t family,
3498 const xfrm_address_t *src, const xfrm_address_t *dst)
3499 {
3500 struct sadb_x_ipsecrequest *rq;
3501 u8 *sa;
3502 int socklen = pfkey_sockaddr_len(family);
3503 int size_req;
3504
3505 size_req = sizeof(struct sadb_x_ipsecrequest) +
3506 pfkey_sockaddr_pair_size(family);
3507
3508 rq = skb_put_zero(skb, size_req);
3509 rq->sadb_x_ipsecrequest_len = size_req;
3510 rq->sadb_x_ipsecrequest_proto = proto;
3511 rq->sadb_x_ipsecrequest_mode = mode;
3512 rq->sadb_x_ipsecrequest_level = level;
3513 rq->sadb_x_ipsecrequest_reqid = reqid;
3514
3515 sa = (u8 *) (rq + 1);
3516 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3517 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3518 return -EINVAL;
3519
3520 return 0;
3521 }
3522 #endif
3523
3524 #ifdef CONFIG_NET_KEY_MIGRATE
3525 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3526 const struct xfrm_migrate *m, int num_bundles,
3527 const struct xfrm_kmaddress *k,
3528 const struct xfrm_encap_tmpl *encap)
3529 {
3530 int i;
3531 int sasize_sel;
3532 int size = 0;
3533 int size_pol = 0;
3534 struct sk_buff *skb;
3535 struct sadb_msg *hdr;
3536 struct sadb_x_policy *pol;
3537 const struct xfrm_migrate *mp;
3538
3539 if (type != XFRM_POLICY_TYPE_MAIN)
3540 return 0;
3541
3542 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3543 return -EINVAL;
3544
3545 if (k != NULL) {
3546 /* addresses for KM */
3547 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3548 pfkey_sockaddr_pair_size(k->family));
3549 }
3550
3551 /* selector */
3552 sasize_sel = pfkey_sockaddr_size(sel->family);
3553 if (!sasize_sel)
3554 return -EINVAL;
3555 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3556
3557 /* policy info */
3558 size_pol += sizeof(struct sadb_x_policy);
3559
3560 /* ipsecrequests */
3561 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3562 /* old locator pair */
3563 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3564 pfkey_sockaddr_pair_size(mp->old_family);
3565 /* new locator pair */
3566 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3567 pfkey_sockaddr_pair_size(mp->new_family);
3568 }
3569
3570 size += sizeof(struct sadb_msg) + size_pol;
3571
3572 /* alloc buffer */
3573 skb = alloc_skb(size, GFP_ATOMIC);
3574 if (skb == NULL)
3575 return -ENOMEM;
3576
3577 hdr = skb_put(skb, sizeof(struct sadb_msg));
3578 hdr->sadb_msg_version = PF_KEY_V2;
3579 hdr->sadb_msg_type = SADB_X_MIGRATE;
3580 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3581 hdr->sadb_msg_len = size / 8;
3582 hdr->sadb_msg_errno = 0;
3583 hdr->sadb_msg_reserved = 0;
3584 hdr->sadb_msg_seq = 0;
3585 hdr->sadb_msg_pid = 0;
3586
3587 /* Addresses to be used by KM for negotiation, if ext is available */
3588 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3589 goto err;
3590
3591 /* selector src */
3592 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3593
3594 /* selector dst */
3595 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3596
3597 /* policy information */
3598 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3599 pol->sadb_x_policy_len = size_pol / 8;
3600 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3601 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3602 pol->sadb_x_policy_dir = dir + 1;
3603 pol->sadb_x_policy_reserved = 0;
3604 pol->sadb_x_policy_id = 0;
3605 pol->sadb_x_policy_priority = 0;
3606
3607 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3608 /* old ipsecrequest */
3609 int mode = pfkey_mode_from_xfrm(mp->mode);
3610 if (mode < 0)
3611 goto err;
3612 if (set_ipsecrequest(skb, mp->proto, mode,
3613 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3614 mp->reqid, mp->old_family,
3615 &mp->old_saddr, &mp->old_daddr) < 0)
3616 goto err;
3617
3618 /* new ipsecrequest */
3619 if (set_ipsecrequest(skb, mp->proto, mode,
3620 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3621 mp->reqid, mp->new_family,
3622 &mp->new_saddr, &mp->new_daddr) < 0)
3623 goto err;
3624 }
3625
3626 /* broadcast migrate message to sockets */
3627 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3628
3629 return 0;
3630
3631 err:
3632 kfree_skb(skb);
3633 return -EINVAL;
3634 }
3635 #else
3636 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3637 const struct xfrm_migrate *m, int num_bundles,
3638 const struct xfrm_kmaddress *k,
3639 const struct xfrm_encap_tmpl *encap)
3640 {
3641 return -ENOPROTOOPT;
3642 }
3643 #endif
3644
3645 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3646 {
3647 struct sock *sk = sock->sk;
3648 struct sk_buff *skb = NULL;
3649 struct sadb_msg *hdr = NULL;
3650 int err;
3651 struct net *net = sock_net(sk);
3652
3653 err = -EOPNOTSUPP;
3654 if (msg->msg_flags & MSG_OOB)
3655 goto out;
3656
3657 err = -EMSGSIZE;
3658 if ((unsigned int)len > sk->sk_sndbuf - 32)
3659 goto out;
3660
3661 err = -ENOBUFS;
3662 skb = alloc_skb(len, GFP_KERNEL);
3663 if (skb == NULL)
3664 goto out;
3665
3666 err = -EFAULT;
3667 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3668 goto out;
3669
3670 hdr = pfkey_get_base_msg(skb, &err);
3671 if (!hdr)
3672 goto out;
3673
3674 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3675 err = pfkey_process(sk, skb, hdr);
3676 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3677
3678 out:
3679 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3680 err = 0;
3681 kfree_skb(skb);
3682
3683 return err ? : len;
3684 }
3685
3686 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3687 int flags)
3688 {
3689 struct sock *sk = sock->sk;
3690 struct pfkey_sock *pfk = pfkey_sk(sk);
3691 struct sk_buff *skb;
3692 int copied, err;
3693
3694 err = -EINVAL;
3695 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3696 goto out;
3697
3698 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3699 if (skb == NULL)
3700 goto out;
3701
3702 copied = skb->len;
3703 if (copied > len) {
3704 msg->msg_flags |= MSG_TRUNC;
3705 copied = len;
3706 }
3707
3708 skb_reset_transport_header(skb);
3709 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3710 if (err)
3711 goto out_free;
3712
3713 sock_recv_ts_and_drops(msg, sk, skb);
3714
3715 err = (flags & MSG_TRUNC) ? skb->len : copied;
3716
3717 if (pfk->dump.dump != NULL &&
3718 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3719 pfkey_do_dump(pfk);
3720
3721 out_free:
3722 skb_free_datagram(sk, skb);
3723 out:
3724 return err;
3725 }
3726
3727 static const struct proto_ops pfkey_ops = {
3728 .family = PF_KEY,
3729 .owner = THIS_MODULE,
3730 /* Operations that make no sense on pfkey sockets. */
3731 .bind = sock_no_bind,
3732 .connect = sock_no_connect,
3733 .socketpair = sock_no_socketpair,
3734 .accept = sock_no_accept,
3735 .getname = sock_no_getname,
3736 .ioctl = sock_no_ioctl,
3737 .listen = sock_no_listen,
3738 .shutdown = sock_no_shutdown,
3739 .setsockopt = sock_no_setsockopt,
3740 .getsockopt = sock_no_getsockopt,
3741 .mmap = sock_no_mmap,
3742 .sendpage = sock_no_sendpage,
3743
3744 /* Now the operations that really occur. */
3745 .release = pfkey_release,
3746 .poll = datagram_poll,
3747 .sendmsg = pfkey_sendmsg,
3748 .recvmsg = pfkey_recvmsg,
3749 };
3750
3751 static const struct net_proto_family pfkey_family_ops = {
3752 .family = PF_KEY,
3753 .create = pfkey_create,
3754 .owner = THIS_MODULE,
3755 };
3756
3757 #ifdef CONFIG_PROC_FS
3758 static int pfkey_seq_show(struct seq_file *f, void *v)
3759 {
3760 struct sock *s = sk_entry(v);
3761
3762 if (v == SEQ_START_TOKEN)
3763 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3764 else
3765 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3766 s,
3767 refcount_read(&s->sk_refcnt),
3768 sk_rmem_alloc_get(s),
3769 sk_wmem_alloc_get(s),
3770 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3771 sock_i_ino(s)
3772 );
3773 return 0;
3774 }
3775
3776 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3777 __acquires(rcu)
3778 {
3779 struct net *net = seq_file_net(f);
3780 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3781
3782 rcu_read_lock();
3783 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3784 }
3785
3786 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3787 {
3788 struct net *net = seq_file_net(f);
3789 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3790
3791 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3792 }
3793
3794 static void pfkey_seq_stop(struct seq_file *f, void *v)
3795 __releases(rcu)
3796 {
3797 rcu_read_unlock();
3798 }
3799
3800 static const struct seq_operations pfkey_seq_ops = {
3801 .start = pfkey_seq_start,
3802 .next = pfkey_seq_next,
3803 .stop = pfkey_seq_stop,
3804 .show = pfkey_seq_show,
3805 };
3806
3807 static int __net_init pfkey_init_proc(struct net *net)
3808 {
3809 struct proc_dir_entry *e;
3810
3811 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3812 sizeof(struct seq_net_private));
3813 if (e == NULL)
3814 return -ENOMEM;
3815
3816 return 0;
3817 }
3818
3819 static void __net_exit pfkey_exit_proc(struct net *net)
3820 {
3821 remove_proc_entry("pfkey", net->proc_net);
3822 }
3823 #else
3824 static inline int pfkey_init_proc(struct net *net)
3825 {
3826 return 0;
3827 }
3828
3829 static inline void pfkey_exit_proc(struct net *net)
3830 {
3831 }
3832 #endif
3833
3834 static struct xfrm_mgr pfkeyv2_mgr =
3835 {
3836 .notify = pfkey_send_notify,
3837 .acquire = pfkey_send_acquire,
3838 .compile_policy = pfkey_compile_policy,
3839 .new_mapping = pfkey_send_new_mapping,
3840 .notify_policy = pfkey_send_policy_notify,
3841 .migrate = pfkey_send_migrate,
3842 .is_alive = pfkey_is_alive,
3843 };
3844
3845 static int __net_init pfkey_net_init(struct net *net)
3846 {
3847 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3848 int rv;
3849
3850 INIT_HLIST_HEAD(&net_pfkey->table);
3851 atomic_set(&net_pfkey->socks_nr, 0);
3852
3853 rv = pfkey_init_proc(net);
3854
3855 return rv;
3856 }
3857
3858 static void __net_exit pfkey_net_exit(struct net *net)
3859 {
3860 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3861
3862 pfkey_exit_proc(net);
3863 WARN_ON(!hlist_empty(&net_pfkey->table));
3864 }
3865
3866 static struct pernet_operations pfkey_net_ops = {
3867 .init = pfkey_net_init,
3868 .exit = pfkey_net_exit,
3869 .id = &pfkey_net_id,
3870 .size = sizeof(struct netns_pfkey),
3871 };
3872
3873 static void __exit ipsec_pfkey_exit(void)
3874 {
3875 xfrm_unregister_km(&pfkeyv2_mgr);
3876 sock_unregister(PF_KEY);
3877 unregister_pernet_subsys(&pfkey_net_ops);
3878 proto_unregister(&key_proto);
3879 }
3880
3881 static int __init ipsec_pfkey_init(void)
3882 {
3883 int err = proto_register(&key_proto, 0);
3884
3885 if (err != 0)
3886 goto out;
3887
3888 err = register_pernet_subsys(&pfkey_net_ops);
3889 if (err != 0)
3890 goto out_unregister_key_proto;
3891 err = sock_register(&pfkey_family_ops);
3892 if (err != 0)
3893 goto out_unregister_pernet;
3894 err = xfrm_register_km(&pfkeyv2_mgr);
3895 if (err != 0)
3896 goto out_sock_unregister;
3897 out:
3898 return err;
3899
3900 out_sock_unregister:
3901 sock_unregister(PF_KEY);
3902 out_unregister_pernet:
3903 unregister_pernet_subsys(&pfkey_net_ops);
3904 out_unregister_key_proto:
3905 proto_unregister(&key_proto);
3906 goto out;
3907 }
3908
3909 module_init(ipsec_pfkey_init);
3910 module_exit(ipsec_pfkey_exit);
3911 MODULE_LICENSE("GPL");
3912 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux with added FPC-III support