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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
[mirror_ubuntu-bionic-kernel.git] / net / key / af_key.c
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, struct sk_buff **skb2,
200 gfp_t allocation, struct sock *sk)
201 {
202 int err = -ENOBUFS;
203
204 sock_hold(sk);
205 if (*skb2 == NULL) {
206 if (refcount_read(&skb->users) != 1) {
207 *skb2 = skb_clone(skb, allocation);
208 } else {
209 *skb2 = skb;
210 refcount_inc(&skb->users);
211 }
212 }
213 if (*skb2 != NULL) {
214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
215 skb_set_owner_r(*skb2, sk);
216 skb_queue_tail(&sk->sk_receive_queue, *skb2);
217 sk->sk_data_ready(sk);
218 *skb2 = NULL;
219 err = 0;
220 }
221 }
222 sock_put(sk);
223 return err;
224 }
225
226 /* Send SKB to all pfkey sockets matching selected criteria. */
227 #define BROADCAST_ALL 0
228 #define BROADCAST_ONE 1
229 #define BROADCAST_REGISTERED 2
230 #define BROADCAST_PROMISC_ONLY 4
231 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
232 int broadcast_flags, struct sock *one_sk,
233 struct net *net)
234 {
235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
236 struct sock *sk;
237 struct sk_buff *skb2 = NULL;
238 int err = -ESRCH;
239
240 /* XXX Do we need something like netlink_overrun? I think
241 * XXX PF_KEY socket apps will not mind current behavior.
242 */
243 if (!skb)
244 return -ENOMEM;
245
246 rcu_read_lock();
247 sk_for_each_rcu(sk, &net_pfkey->table) {
248 struct pfkey_sock *pfk = pfkey_sk(sk);
249 int err2;
250
251 /* Yes, it means that if you are meant to receive this
252 * pfkey message you receive it twice as promiscuous
253 * socket.
254 */
255 if (pfk->promisc)
256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
257
258 /* the exact target will be processed later */
259 if (sk == one_sk)
260 continue;
261 if (broadcast_flags != BROADCAST_ALL) {
262 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
263 continue;
264 if ((broadcast_flags & BROADCAST_REGISTERED) &&
265 !pfk->registered)
266 continue;
267 if (broadcast_flags & BROADCAST_ONE)
268 continue;
269 }
270
271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
272
273 /* Error is cleared after successful sending to at least one
274 * registered KM */
275 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
276 err = err2;
277 }
278 rcu_read_unlock();
279
280 if (one_sk != NULL)
281 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
282
283 kfree_skb(skb2);
284 kfree_skb(skb);
285 return err;
286 }
287
288 static int pfkey_do_dump(struct pfkey_sock *pfk)
289 {
290 struct sadb_msg *hdr;
291 int rc;
292
293 mutex_lock(&pfk->dump_lock);
294 if (!pfk->dump.dump) {
295 rc = 0;
296 goto out;
297 }
298
299 rc = pfk->dump.dump(pfk);
300 if (rc == -ENOBUFS) {
301 rc = 0;
302 goto out;
303 }
304
305 if (pfk->dump.skb) {
306 if (!pfkey_can_dump(&pfk->sk)) {
307 rc = 0;
308 goto out;
309 }
310
311 hdr = (struct sadb_msg *) pfk->dump.skb->data;
312 hdr->sadb_msg_seq = 0;
313 hdr->sadb_msg_errno = rc;
314 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
315 &pfk->sk, sock_net(&pfk->sk));
316 pfk->dump.skb = NULL;
317 }
318
319 pfkey_terminate_dump(pfk);
320
321 out:
322 mutex_unlock(&pfk->dump_lock);
323 return rc;
324 }
325
326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
327 const struct sadb_msg *orig)
328 {
329 *new = *orig;
330 }
331
332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
333 {
334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
335 struct sadb_msg *hdr;
336
337 if (!skb)
338 return -ENOBUFS;
339
340 /* Woe be to the platform trying to support PFKEY yet
341 * having normal errnos outside the 1-255 range, inclusive.
342 */
343 err = -err;
344 if (err == ERESTARTSYS ||
345 err == ERESTARTNOHAND ||
346 err == ERESTARTNOINTR)
347 err = EINTR;
348 if (err >= 512)
349 err = EINVAL;
350 BUG_ON(err <= 0 || err >= 256);
351
352 hdr = skb_put(skb, sizeof(struct sadb_msg));
353 pfkey_hdr_dup(hdr, orig);
354 hdr->sadb_msg_errno = (uint8_t) err;
355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
356 sizeof(uint64_t));
357
358 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
359
360 return 0;
361 }
362
363 static const u8 sadb_ext_min_len[] = {
364 [SADB_EXT_RESERVED] = (u8) 0,
365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
391 };
392
393 /* Verify sadb_address_{len,prefixlen} against sa_family. */
394 static int verify_address_len(const void *p)
395 {
396 const struct sadb_address *sp = p;
397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
398 const struct sockaddr_in *sin;
399 #if IS_ENABLED(CONFIG_IPV6)
400 const struct sockaddr_in6 *sin6;
401 #endif
402 int len;
403
404 if (sp->sadb_address_len <
405 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
406 sizeof(uint64_t)))
407 return -EINVAL;
408
409 switch (addr->sa_family) {
410 case AF_INET:
411 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
412 if (sp->sadb_address_len != len ||
413 sp->sadb_address_prefixlen > 32)
414 return -EINVAL;
415 break;
416 #if IS_ENABLED(CONFIG_IPV6)
417 case AF_INET6:
418 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
419 if (sp->sadb_address_len != len ||
420 sp->sadb_address_prefixlen > 128)
421 return -EINVAL;
422 break;
423 #endif
424 default:
425 /* It is user using kernel to keep track of security
426 * associations for another protocol, such as
427 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
428 * lengths.
429 *
430 * XXX Actually, association/policy database is not yet
431 * XXX able to cope with arbitrary sockaddr families.
432 * XXX When it can, remove this -EINVAL. -DaveM
433 */
434 return -EINVAL;
435 }
436
437 return 0;
438 }
439
440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
441 {
442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 sec_ctx->sadb_x_ctx_len,
444 sizeof(uint64_t));
445 }
446
447 static inline int verify_sec_ctx_len(const void *p)
448 {
449 const struct sadb_x_sec_ctx *sec_ctx = p;
450 int len = sec_ctx->sadb_x_ctx_len;
451
452 if (len > PAGE_SIZE)
453 return -EINVAL;
454
455 len = pfkey_sec_ctx_len(sec_ctx);
456
457 if (sec_ctx->sadb_x_sec_len != len)
458 return -EINVAL;
459
460 return 0;
461 }
462
463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 gfp_t gfp)
465 {
466 struct xfrm_user_sec_ctx *uctx = NULL;
467 int ctx_size = sec_ctx->sadb_x_ctx_len;
468
469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
470
471 if (!uctx)
472 return NULL;
473
474 uctx->len = pfkey_sec_ctx_len(sec_ctx);
475 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
479 memcpy(uctx + 1, sec_ctx + 1,
480 uctx->ctx_len);
481
482 return uctx;
483 }
484
485 static int present_and_same_family(const struct sadb_address *src,
486 const struct sadb_address *dst)
487 {
488 const struct sockaddr *s_addr, *d_addr;
489
490 if (!src || !dst)
491 return 0;
492
493 s_addr = (const struct sockaddr *)(src + 1);
494 d_addr = (const struct sockaddr *)(dst + 1);
495 if (s_addr->sa_family != d_addr->sa_family)
496 return 0;
497 if (s_addr->sa_family != AF_INET
498 #if IS_ENABLED(CONFIG_IPV6)
499 && s_addr->sa_family != AF_INET6
500 #endif
501 )
502 return 0;
503
504 return 1;
505 }
506
507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
508 {
509 const char *p = (char *) hdr;
510 int len = skb->len;
511
512 len -= sizeof(*hdr);
513 p += sizeof(*hdr);
514 while (len > 0) {
515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
516 uint16_t ext_type;
517 int ext_len;
518
519 if (len < sizeof(*ehdr))
520 return -EINVAL;
521
522 ext_len = ehdr->sadb_ext_len;
523 ext_len *= sizeof(uint64_t);
524 ext_type = ehdr->sadb_ext_type;
525 if (ext_len < sizeof(uint64_t) ||
526 ext_len > len ||
527 ext_type == SADB_EXT_RESERVED)
528 return -EINVAL;
529
530 if (ext_type <= SADB_EXT_MAX) {
531 int min = (int) sadb_ext_min_len[ext_type];
532 if (ext_len < min)
533 return -EINVAL;
534 if (ext_hdrs[ext_type-1] != NULL)
535 return -EINVAL;
536 if (ext_type == SADB_EXT_ADDRESS_SRC ||
537 ext_type == SADB_EXT_ADDRESS_DST ||
538 ext_type == SADB_EXT_ADDRESS_PROXY ||
539 ext_type == SADB_X_EXT_NAT_T_OA) {
540 if (verify_address_len(p))
541 return -EINVAL;
542 }
543 if (ext_type == SADB_X_EXT_SEC_CTX) {
544 if (verify_sec_ctx_len(p))
545 return -EINVAL;
546 }
547 ext_hdrs[ext_type-1] = (void *) p;
548 }
549 p += ext_len;
550 len -= ext_len;
551 }
552
553 return 0;
554 }
555
556 static uint16_t
557 pfkey_satype2proto(uint8_t satype)
558 {
559 switch (satype) {
560 case SADB_SATYPE_UNSPEC:
561 return IPSEC_PROTO_ANY;
562 case SADB_SATYPE_AH:
563 return IPPROTO_AH;
564 case SADB_SATYPE_ESP:
565 return IPPROTO_ESP;
566 case SADB_X_SATYPE_IPCOMP:
567 return IPPROTO_COMP;
568 default:
569 return 0;
570 }
571 /* NOTREACHED */
572 }
573
574 static uint8_t
575 pfkey_proto2satype(uint16_t proto)
576 {
577 switch (proto) {
578 case IPPROTO_AH:
579 return SADB_SATYPE_AH;
580 case IPPROTO_ESP:
581 return SADB_SATYPE_ESP;
582 case IPPROTO_COMP:
583 return SADB_X_SATYPE_IPCOMP;
584 default:
585 return 0;
586 }
587 /* NOTREACHED */
588 }
589
590 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
591 * say specifically 'just raw sockets' as we encode them as 255.
592 */
593
594 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
595 {
596 return proto == IPSEC_PROTO_ANY ? 0 : proto;
597 }
598
599 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
600 {
601 return proto ? proto : IPSEC_PROTO_ANY;
602 }
603
604 static inline int pfkey_sockaddr_len(sa_family_t family)
605 {
606 switch (family) {
607 case AF_INET:
608 return sizeof(struct sockaddr_in);
609 #if IS_ENABLED(CONFIG_IPV6)
610 case AF_INET6:
611 return sizeof(struct sockaddr_in6);
612 #endif
613 }
614 return 0;
615 }
616
617 static
618 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
619 {
620 switch (sa->sa_family) {
621 case AF_INET:
622 xaddr->a4 =
623 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
624 return AF_INET;
625 #if IS_ENABLED(CONFIG_IPV6)
626 case AF_INET6:
627 memcpy(xaddr->a6,
628 &((struct sockaddr_in6 *)sa)->sin6_addr,
629 sizeof(struct in6_addr));
630 return AF_INET6;
631 #endif
632 }
633 return 0;
634 }
635
636 static
637 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
638 {
639 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
640 xaddr);
641 }
642
643 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
644 {
645 const struct sadb_sa *sa;
646 const struct sadb_address *addr;
647 uint16_t proto;
648 unsigned short family;
649 xfrm_address_t *xaddr;
650
651 sa = ext_hdrs[SADB_EXT_SA - 1];
652 if (sa == NULL)
653 return NULL;
654
655 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
656 if (proto == 0)
657 return NULL;
658
659 /* sadb_address_len should be checked by caller */
660 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
661 if (addr == NULL)
662 return NULL;
663
664 family = ((const struct sockaddr *)(addr + 1))->sa_family;
665 switch (family) {
666 case AF_INET:
667 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
668 break;
669 #if IS_ENABLED(CONFIG_IPV6)
670 case AF_INET6:
671 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
672 break;
673 #endif
674 default:
675 xaddr = NULL;
676 }
677
678 if (!xaddr)
679 return NULL;
680
681 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
682 }
683
684 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
685
686 static int
687 pfkey_sockaddr_size(sa_family_t family)
688 {
689 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
690 }
691
692 static inline int pfkey_mode_from_xfrm(int mode)
693 {
694 switch(mode) {
695 case XFRM_MODE_TRANSPORT:
696 return IPSEC_MODE_TRANSPORT;
697 case XFRM_MODE_TUNNEL:
698 return IPSEC_MODE_TUNNEL;
699 case XFRM_MODE_BEET:
700 return IPSEC_MODE_BEET;
701 default:
702 return -1;
703 }
704 }
705
706 static inline int pfkey_mode_to_xfrm(int mode)
707 {
708 switch(mode) {
709 case IPSEC_MODE_ANY: /*XXX*/
710 case IPSEC_MODE_TRANSPORT:
711 return XFRM_MODE_TRANSPORT;
712 case IPSEC_MODE_TUNNEL:
713 return XFRM_MODE_TUNNEL;
714 case IPSEC_MODE_BEET:
715 return XFRM_MODE_BEET;
716 default:
717 return -1;
718 }
719 }
720
721 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
722 struct sockaddr *sa,
723 unsigned short family)
724 {
725 switch (family) {
726 case AF_INET:
727 {
728 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
729 sin->sin_family = AF_INET;
730 sin->sin_port = port;
731 sin->sin_addr.s_addr = xaddr->a4;
732 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
733 return 32;
734 }
735 #if IS_ENABLED(CONFIG_IPV6)
736 case AF_INET6:
737 {
738 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
739 sin6->sin6_family = AF_INET6;
740 sin6->sin6_port = port;
741 sin6->sin6_flowinfo = 0;
742 sin6->sin6_addr = xaddr->in6;
743 sin6->sin6_scope_id = 0;
744 return 128;
745 }
746 #endif
747 }
748 return 0;
749 }
750
751 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
752 int add_keys, int hsc)
753 {
754 struct sk_buff *skb;
755 struct sadb_msg *hdr;
756 struct sadb_sa *sa;
757 struct sadb_lifetime *lifetime;
758 struct sadb_address *addr;
759 struct sadb_key *key;
760 struct sadb_x_sa2 *sa2;
761 struct sadb_x_sec_ctx *sec_ctx;
762 struct xfrm_sec_ctx *xfrm_ctx;
763 int ctx_size = 0;
764 int size;
765 int auth_key_size = 0;
766 int encrypt_key_size = 0;
767 int sockaddr_size;
768 struct xfrm_encap_tmpl *natt = NULL;
769 int mode;
770
771 /* address family check */
772 sockaddr_size = pfkey_sockaddr_size(x->props.family);
773 if (!sockaddr_size)
774 return ERR_PTR(-EINVAL);
775
776 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
777 key(AE), (identity(SD),) (sensitivity)> */
778 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
779 sizeof(struct sadb_lifetime) +
780 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
781 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
782 sizeof(struct sadb_address)*2 +
783 sockaddr_size*2 +
784 sizeof(struct sadb_x_sa2);
785
786 if ((xfrm_ctx = x->security)) {
787 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
788 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
789 }
790
791 /* identity & sensitivity */
792 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
793 size += sizeof(struct sadb_address) + sockaddr_size;
794
795 if (add_keys) {
796 if (x->aalg && x->aalg->alg_key_len) {
797 auth_key_size =
798 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
799 size += sizeof(struct sadb_key) + auth_key_size;
800 }
801 if (x->ealg && x->ealg->alg_key_len) {
802 encrypt_key_size =
803 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
804 size += sizeof(struct sadb_key) + encrypt_key_size;
805 }
806 }
807 if (x->encap)
808 natt = x->encap;
809
810 if (natt && natt->encap_type) {
811 size += sizeof(struct sadb_x_nat_t_type);
812 size += sizeof(struct sadb_x_nat_t_port);
813 size += sizeof(struct sadb_x_nat_t_port);
814 }
815
816 skb = alloc_skb(size + 16, GFP_ATOMIC);
817 if (skb == NULL)
818 return ERR_PTR(-ENOBUFS);
819
820 /* call should fill header later */
821 hdr = skb_put(skb, sizeof(struct sadb_msg));
822 memset(hdr, 0, size); /* XXX do we need this ? */
823 hdr->sadb_msg_len = size / sizeof(uint64_t);
824
825 /* sa */
826 sa = skb_put(skb, sizeof(struct sadb_sa));
827 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
828 sa->sadb_sa_exttype = SADB_EXT_SA;
829 sa->sadb_sa_spi = x->id.spi;
830 sa->sadb_sa_replay = x->props.replay_window;
831 switch (x->km.state) {
832 case XFRM_STATE_VALID:
833 sa->sadb_sa_state = x->km.dying ?
834 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
835 break;
836 case XFRM_STATE_ACQ:
837 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
838 break;
839 default:
840 sa->sadb_sa_state = SADB_SASTATE_DEAD;
841 break;
842 }
843 sa->sadb_sa_auth = 0;
844 if (x->aalg) {
845 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
846 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
847 a->desc.sadb_alg_id : 0;
848 }
849 sa->sadb_sa_encrypt = 0;
850 BUG_ON(x->ealg && x->calg);
851 if (x->ealg) {
852 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
853 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
854 a->desc.sadb_alg_id : 0;
855 }
856 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
857 if (x->calg) {
858 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
859 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
860 a->desc.sadb_alg_id : 0;
861 }
862
863 sa->sadb_sa_flags = 0;
864 if (x->props.flags & XFRM_STATE_NOECN)
865 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
866 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
867 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
868 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
869 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
870
871 /* hard time */
872 if (hsc & 2) {
873 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
874 lifetime->sadb_lifetime_len =
875 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
876 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
877 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
878 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
879 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
880 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
881 }
882 /* soft time */
883 if (hsc & 1) {
884 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
885 lifetime->sadb_lifetime_len =
886 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
887 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
888 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
889 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
890 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
891 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
892 }
893 /* current time */
894 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
895 lifetime->sadb_lifetime_len =
896 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
897 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
898 lifetime->sadb_lifetime_allocations = x->curlft.packets;
899 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
900 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
901 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
902 /* src address */
903 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
904 addr->sadb_address_len =
905 (sizeof(struct sadb_address)+sockaddr_size)/
906 sizeof(uint64_t);
907 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
908 /* "if the ports are non-zero, then the sadb_address_proto field,
909 normally zero, MUST be filled in with the transport
910 protocol's number." - RFC2367 */
911 addr->sadb_address_proto = 0;
912 addr->sadb_address_reserved = 0;
913
914 addr->sadb_address_prefixlen =
915 pfkey_sockaddr_fill(&x->props.saddr, 0,
916 (struct sockaddr *) (addr + 1),
917 x->props.family);
918 if (!addr->sadb_address_prefixlen)
919 BUG();
920
921 /* dst address */
922 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
923 addr->sadb_address_len =
924 (sizeof(struct sadb_address)+sockaddr_size)/
925 sizeof(uint64_t);
926 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
927 addr->sadb_address_proto = 0;
928 addr->sadb_address_reserved = 0;
929
930 addr->sadb_address_prefixlen =
931 pfkey_sockaddr_fill(&x->id.daddr, 0,
932 (struct sockaddr *) (addr + 1),
933 x->props.family);
934 if (!addr->sadb_address_prefixlen)
935 BUG();
936
937 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
938 x->props.family)) {
939 addr = skb_put(skb,
940 sizeof(struct sadb_address) + sockaddr_size);
941 addr->sadb_address_len =
942 (sizeof(struct sadb_address)+sockaddr_size)/
943 sizeof(uint64_t);
944 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
945 addr->sadb_address_proto =
946 pfkey_proto_from_xfrm(x->sel.proto);
947 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
948 addr->sadb_address_reserved = 0;
949
950 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
951 (struct sockaddr *) (addr + 1),
952 x->props.family);
953 }
954
955 /* auth key */
956 if (add_keys && auth_key_size) {
957 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
958 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
959 sizeof(uint64_t);
960 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
961 key->sadb_key_bits = x->aalg->alg_key_len;
962 key->sadb_key_reserved = 0;
963 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
964 }
965 /* encrypt key */
966 if (add_keys && encrypt_key_size) {
967 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
968 key->sadb_key_len = (sizeof(struct sadb_key) +
969 encrypt_key_size) / sizeof(uint64_t);
970 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
971 key->sadb_key_bits = x->ealg->alg_key_len;
972 key->sadb_key_reserved = 0;
973 memcpy(key + 1, x->ealg->alg_key,
974 (x->ealg->alg_key_len+7)/8);
975 }
976
977 /* sa */
978 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
979 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
980 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
981 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
982 kfree_skb(skb);
983 return ERR_PTR(-EINVAL);
984 }
985 sa2->sadb_x_sa2_mode = mode;
986 sa2->sadb_x_sa2_reserved1 = 0;
987 sa2->sadb_x_sa2_reserved2 = 0;
988 sa2->sadb_x_sa2_sequence = 0;
989 sa2->sadb_x_sa2_reqid = x->props.reqid;
990
991 if (natt && natt->encap_type) {
992 struct sadb_x_nat_t_type *n_type;
993 struct sadb_x_nat_t_port *n_port;
994
995 /* type */
996 n_type = skb_put(skb, sizeof(*n_type));
997 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
998 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
999 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1000 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1001 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1002 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1003
1004 /* source port */
1005 n_port = skb_put(skb, sizeof(*n_port));
1006 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1007 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1008 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1009 n_port->sadb_x_nat_t_port_reserved = 0;
1010
1011 /* dest port */
1012 n_port = skb_put(skb, sizeof(*n_port));
1013 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1014 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1015 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1016 n_port->sadb_x_nat_t_port_reserved = 0;
1017 }
1018
1019 /* security context */
1020 if (xfrm_ctx) {
1021 sec_ctx = skb_put(skb,
1022 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1023 sec_ctx->sadb_x_sec_len =
1024 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1025 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1026 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1027 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1028 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1029 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1030 xfrm_ctx->ctx_len);
1031 }
1032
1033 return skb;
1034 }
1035
1036
1037 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1038 {
1039 struct sk_buff *skb;
1040
1041 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1042
1043 return skb;
1044 }
1045
1046 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1047 int hsc)
1048 {
1049 return __pfkey_xfrm_state2msg(x, 0, hsc);
1050 }
1051
1052 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1053 const struct sadb_msg *hdr,
1054 void * const *ext_hdrs)
1055 {
1056 struct xfrm_state *x;
1057 const struct sadb_lifetime *lifetime;
1058 const struct sadb_sa *sa;
1059 const struct sadb_key *key;
1060 const struct sadb_x_sec_ctx *sec_ctx;
1061 uint16_t proto;
1062 int err;
1063
1064
1065 sa = ext_hdrs[SADB_EXT_SA - 1];
1066 if (!sa ||
1067 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1068 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1069 return ERR_PTR(-EINVAL);
1070 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1071 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1072 return ERR_PTR(-EINVAL);
1073 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1074 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1075 return ERR_PTR(-EINVAL);
1076 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1077 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1078 return ERR_PTR(-EINVAL);
1079
1080 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1081 if (proto == 0)
1082 return ERR_PTR(-EINVAL);
1083
1084 /* default error is no buffer space */
1085 err = -ENOBUFS;
1086
1087 /* RFC2367:
1088
1089 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1090 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1091 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1092 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1093 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1094 not true.
1095
1096 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1097 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1098 */
1099 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1100 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1101 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1102 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1103 return ERR_PTR(-EINVAL);
1104 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1105 if (key != NULL &&
1106 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1107 ((key->sadb_key_bits+7) / 8 == 0 ||
1108 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1109 return ERR_PTR(-EINVAL);
1110 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1111 if (key != NULL &&
1112 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1113 ((key->sadb_key_bits+7) / 8 == 0 ||
1114 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1115 return ERR_PTR(-EINVAL);
1116
1117 x = xfrm_state_alloc(net);
1118 if (x == NULL)
1119 return ERR_PTR(-ENOBUFS);
1120
1121 x->id.proto = proto;
1122 x->id.spi = sa->sadb_sa_spi;
1123 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1124 (sizeof(x->replay.bitmap) * 8));
1125 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1126 x->props.flags |= XFRM_STATE_NOECN;
1127 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1128 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1129 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1130 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1131
1132 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1133 if (lifetime != NULL) {
1134 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1135 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1136 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1137 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1138 }
1139 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1140 if (lifetime != NULL) {
1141 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1142 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1143 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1144 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1145 }
1146
1147 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1148 if (sec_ctx != NULL) {
1149 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1150
1151 if (!uctx)
1152 goto out;
1153
1154 err = security_xfrm_state_alloc(x, uctx);
1155 kfree(uctx);
1156
1157 if (err)
1158 goto out;
1159 }
1160
1161 err = -ENOBUFS;
1162 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1163 if (sa->sadb_sa_auth) {
1164 int keysize = 0;
1165 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1166 if (!a || !a->pfkey_supported) {
1167 err = -ENOSYS;
1168 goto out;
1169 }
1170 if (key)
1171 keysize = (key->sadb_key_bits + 7) / 8;
1172 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1173 if (!x->aalg) {
1174 err = -ENOMEM;
1175 goto out;
1176 }
1177 strcpy(x->aalg->alg_name, a->name);
1178 x->aalg->alg_key_len = 0;
1179 if (key) {
1180 x->aalg->alg_key_len = key->sadb_key_bits;
1181 memcpy(x->aalg->alg_key, key+1, keysize);
1182 }
1183 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1184 x->props.aalgo = sa->sadb_sa_auth;
1185 /* x->algo.flags = sa->sadb_sa_flags; */
1186 }
1187 if (sa->sadb_sa_encrypt) {
1188 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1189 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1190 if (!a || !a->pfkey_supported) {
1191 err = -ENOSYS;
1192 goto out;
1193 }
1194 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1195 if (!x->calg) {
1196 err = -ENOMEM;
1197 goto out;
1198 }
1199 strcpy(x->calg->alg_name, a->name);
1200 x->props.calgo = sa->sadb_sa_encrypt;
1201 } else {
1202 int keysize = 0;
1203 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1204 if (!a || !a->pfkey_supported) {
1205 err = -ENOSYS;
1206 goto out;
1207 }
1208 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1209 if (key)
1210 keysize = (key->sadb_key_bits + 7) / 8;
1211 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1212 if (!x->ealg) {
1213 err = -ENOMEM;
1214 goto out;
1215 }
1216 strcpy(x->ealg->alg_name, a->name);
1217 x->ealg->alg_key_len = 0;
1218 if (key) {
1219 x->ealg->alg_key_len = key->sadb_key_bits;
1220 memcpy(x->ealg->alg_key, key+1, keysize);
1221 }
1222 x->props.ealgo = sa->sadb_sa_encrypt;
1223 x->geniv = a->uinfo.encr.geniv;
1224 }
1225 }
1226 /* x->algo.flags = sa->sadb_sa_flags; */
1227
1228 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1229 &x->props.saddr);
1230 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1231 &x->id.daddr);
1232
1233 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1234 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1235 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1236 if (mode < 0) {
1237 err = -EINVAL;
1238 goto out;
1239 }
1240 x->props.mode = mode;
1241 x->props.reqid = sa2->sadb_x_sa2_reqid;
1242 }
1243
1244 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1245 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1246
1247 /* Nobody uses this, but we try. */
1248 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1249 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1250 }
1251
1252 if (!x->sel.family)
1253 x->sel.family = x->props.family;
1254
1255 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1256 const struct sadb_x_nat_t_type* n_type;
1257 struct xfrm_encap_tmpl *natt;
1258
1259 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1260 if (!x->encap) {
1261 err = -ENOMEM;
1262 goto out;
1263 }
1264
1265 natt = x->encap;
1266 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1267 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1268
1269 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1270 const struct sadb_x_nat_t_port *n_port =
1271 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1272 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1273 }
1274 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1275 const struct sadb_x_nat_t_port *n_port =
1276 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1277 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1278 }
1279 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1280 }
1281
1282 err = xfrm_init_state(x);
1283 if (err)
1284 goto out;
1285
1286 x->km.seq = hdr->sadb_msg_seq;
1287 return x;
1288
1289 out:
1290 x->km.state = XFRM_STATE_DEAD;
1291 xfrm_state_put(x);
1292 return ERR_PTR(err);
1293 }
1294
1295 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1296 {
1297 return -EOPNOTSUPP;
1298 }
1299
1300 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1301 {
1302 struct net *net = sock_net(sk);
1303 struct sk_buff *resp_skb;
1304 struct sadb_x_sa2 *sa2;
1305 struct sadb_address *saddr, *daddr;
1306 struct sadb_msg *out_hdr;
1307 struct sadb_spirange *range;
1308 struct xfrm_state *x = NULL;
1309 int mode;
1310 int err;
1311 u32 min_spi, max_spi;
1312 u32 reqid;
1313 u8 proto;
1314 unsigned short family;
1315 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1316
1317 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1318 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1319 return -EINVAL;
1320
1321 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1322 if (proto == 0)
1323 return -EINVAL;
1324
1325 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1326 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1327 if (mode < 0)
1328 return -EINVAL;
1329 reqid = sa2->sadb_x_sa2_reqid;
1330 } else {
1331 mode = 0;
1332 reqid = 0;
1333 }
1334
1335 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1336 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1337
1338 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1339 switch (family) {
1340 case AF_INET:
1341 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1342 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1343 break;
1344 #if IS_ENABLED(CONFIG_IPV6)
1345 case AF_INET6:
1346 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1347 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1348 break;
1349 #endif
1350 }
1351
1352 if (hdr->sadb_msg_seq) {
1353 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1354 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1355 xfrm_state_put(x);
1356 x = NULL;
1357 }
1358 }
1359
1360 if (!x)
1361 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1362
1363 if (x == NULL)
1364 return -ENOENT;
1365
1366 min_spi = 0x100;
1367 max_spi = 0x0fffffff;
1368
1369 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1370 if (range) {
1371 min_spi = range->sadb_spirange_min;
1372 max_spi = range->sadb_spirange_max;
1373 }
1374
1375 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1376 if (err) {
1377 xfrm_state_put(x);
1378 return err;
1379 }
1380
1381 err = xfrm_alloc_spi(x, min_spi, max_spi);
1382 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1383
1384 if (IS_ERR(resp_skb)) {
1385 xfrm_state_put(x);
1386 return PTR_ERR(resp_skb);
1387 }
1388
1389 out_hdr = (struct sadb_msg *) resp_skb->data;
1390 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1391 out_hdr->sadb_msg_type = SADB_GETSPI;
1392 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1393 out_hdr->sadb_msg_errno = 0;
1394 out_hdr->sadb_msg_reserved = 0;
1395 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1396 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1397
1398 xfrm_state_put(x);
1399
1400 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1401
1402 return 0;
1403 }
1404
1405 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1406 {
1407 struct net *net = sock_net(sk);
1408 struct xfrm_state *x;
1409
1410 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1411 return -EOPNOTSUPP;
1412
1413 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1414 return 0;
1415
1416 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1417 if (x == NULL)
1418 return 0;
1419
1420 spin_lock_bh(&x->lock);
1421 if (x->km.state == XFRM_STATE_ACQ)
1422 x->km.state = XFRM_STATE_ERROR;
1423
1424 spin_unlock_bh(&x->lock);
1425 xfrm_state_put(x);
1426 return 0;
1427 }
1428
1429 static inline int event2poltype(int event)
1430 {
1431 switch (event) {
1432 case XFRM_MSG_DELPOLICY:
1433 return SADB_X_SPDDELETE;
1434 case XFRM_MSG_NEWPOLICY:
1435 return SADB_X_SPDADD;
1436 case XFRM_MSG_UPDPOLICY:
1437 return SADB_X_SPDUPDATE;
1438 case XFRM_MSG_POLEXPIRE:
1439 // return SADB_X_SPDEXPIRE;
1440 default:
1441 pr_err("pfkey: Unknown policy event %d\n", event);
1442 break;
1443 }
1444
1445 return 0;
1446 }
1447
1448 static inline int event2keytype(int event)
1449 {
1450 switch (event) {
1451 case XFRM_MSG_DELSA:
1452 return SADB_DELETE;
1453 case XFRM_MSG_NEWSA:
1454 return SADB_ADD;
1455 case XFRM_MSG_UPDSA:
1456 return SADB_UPDATE;
1457 case XFRM_MSG_EXPIRE:
1458 return SADB_EXPIRE;
1459 default:
1460 pr_err("pfkey: Unknown SA event %d\n", event);
1461 break;
1462 }
1463
1464 return 0;
1465 }
1466
1467 /* ADD/UPD/DEL */
1468 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1469 {
1470 struct sk_buff *skb;
1471 struct sadb_msg *hdr;
1472
1473 skb = pfkey_xfrm_state2msg(x);
1474
1475 if (IS_ERR(skb))
1476 return PTR_ERR(skb);
1477
1478 hdr = (struct sadb_msg *) skb->data;
1479 hdr->sadb_msg_version = PF_KEY_V2;
1480 hdr->sadb_msg_type = event2keytype(c->event);
1481 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1482 hdr->sadb_msg_errno = 0;
1483 hdr->sadb_msg_reserved = 0;
1484 hdr->sadb_msg_seq = c->seq;
1485 hdr->sadb_msg_pid = c->portid;
1486
1487 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1488
1489 return 0;
1490 }
1491
1492 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1493 {
1494 struct net *net = sock_net(sk);
1495 struct xfrm_state *x;
1496 int err;
1497 struct km_event c;
1498
1499 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1500 if (IS_ERR(x))
1501 return PTR_ERR(x);
1502
1503 xfrm_state_hold(x);
1504 if (hdr->sadb_msg_type == SADB_ADD)
1505 err = xfrm_state_add(x);
1506 else
1507 err = xfrm_state_update(x);
1508
1509 xfrm_audit_state_add(x, err ? 0 : 1, true);
1510
1511 if (err < 0) {
1512 x->km.state = XFRM_STATE_DEAD;
1513 __xfrm_state_put(x);
1514 goto out;
1515 }
1516
1517 if (hdr->sadb_msg_type == SADB_ADD)
1518 c.event = XFRM_MSG_NEWSA;
1519 else
1520 c.event = XFRM_MSG_UPDSA;
1521 c.seq = hdr->sadb_msg_seq;
1522 c.portid = hdr->sadb_msg_pid;
1523 km_state_notify(x, &c);
1524 out:
1525 xfrm_state_put(x);
1526 return err;
1527 }
1528
1529 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1530 {
1531 struct net *net = sock_net(sk);
1532 struct xfrm_state *x;
1533 struct km_event c;
1534 int err;
1535
1536 if (!ext_hdrs[SADB_EXT_SA-1] ||
1537 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1538 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1539 return -EINVAL;
1540
1541 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1542 if (x == NULL)
1543 return -ESRCH;
1544
1545 if ((err = security_xfrm_state_delete(x)))
1546 goto out;
1547
1548 if (xfrm_state_kern(x)) {
1549 err = -EPERM;
1550 goto out;
1551 }
1552
1553 err = xfrm_state_delete(x);
1554
1555 if (err < 0)
1556 goto out;
1557
1558 c.seq = hdr->sadb_msg_seq;
1559 c.portid = hdr->sadb_msg_pid;
1560 c.event = XFRM_MSG_DELSA;
1561 km_state_notify(x, &c);
1562 out:
1563 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1564 xfrm_state_put(x);
1565
1566 return err;
1567 }
1568
1569 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1570 {
1571 struct net *net = sock_net(sk);
1572 __u8 proto;
1573 struct sk_buff *out_skb;
1574 struct sadb_msg *out_hdr;
1575 struct xfrm_state *x;
1576
1577 if (!ext_hdrs[SADB_EXT_SA-1] ||
1578 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1579 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1580 return -EINVAL;
1581
1582 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1583 if (x == NULL)
1584 return -ESRCH;
1585
1586 out_skb = pfkey_xfrm_state2msg(x);
1587 proto = x->id.proto;
1588 xfrm_state_put(x);
1589 if (IS_ERR(out_skb))
1590 return PTR_ERR(out_skb);
1591
1592 out_hdr = (struct sadb_msg *) out_skb->data;
1593 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1594 out_hdr->sadb_msg_type = SADB_GET;
1595 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1596 out_hdr->sadb_msg_errno = 0;
1597 out_hdr->sadb_msg_reserved = 0;
1598 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1599 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1600 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1601
1602 return 0;
1603 }
1604
1605 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1606 gfp_t allocation)
1607 {
1608 struct sk_buff *skb;
1609 struct sadb_msg *hdr;
1610 int len, auth_len, enc_len, i;
1611
1612 auth_len = xfrm_count_pfkey_auth_supported();
1613 if (auth_len) {
1614 auth_len *= sizeof(struct sadb_alg);
1615 auth_len += sizeof(struct sadb_supported);
1616 }
1617
1618 enc_len = xfrm_count_pfkey_enc_supported();
1619 if (enc_len) {
1620 enc_len *= sizeof(struct sadb_alg);
1621 enc_len += sizeof(struct sadb_supported);
1622 }
1623
1624 len = enc_len + auth_len + sizeof(struct sadb_msg);
1625
1626 skb = alloc_skb(len + 16, allocation);
1627 if (!skb)
1628 goto out_put_algs;
1629
1630 hdr = skb_put(skb, sizeof(*hdr));
1631 pfkey_hdr_dup(hdr, orig);
1632 hdr->sadb_msg_errno = 0;
1633 hdr->sadb_msg_len = len / sizeof(uint64_t);
1634
1635 if (auth_len) {
1636 struct sadb_supported *sp;
1637 struct sadb_alg *ap;
1638
1639 sp = skb_put(skb, auth_len);
1640 ap = (struct sadb_alg *) (sp + 1);
1641
1642 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1643 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1644
1645 for (i = 0; ; i++) {
1646 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1647 if (!aalg)
1648 break;
1649 if (!aalg->pfkey_supported)
1650 continue;
1651 if (aalg->available)
1652 *ap++ = aalg->desc;
1653 }
1654 }
1655
1656 if (enc_len) {
1657 struct sadb_supported *sp;
1658 struct sadb_alg *ap;
1659
1660 sp = skb_put(skb, enc_len);
1661 ap = (struct sadb_alg *) (sp + 1);
1662
1663 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1664 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1665
1666 for (i = 0; ; i++) {
1667 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1668 if (!ealg)
1669 break;
1670 if (!ealg->pfkey_supported)
1671 continue;
1672 if (ealg->available)
1673 *ap++ = ealg->desc;
1674 }
1675 }
1676
1677 out_put_algs:
1678 return skb;
1679 }
1680
1681 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1682 {
1683 struct pfkey_sock *pfk = pfkey_sk(sk);
1684 struct sk_buff *supp_skb;
1685
1686 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1687 return -EINVAL;
1688
1689 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1690 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1691 return -EEXIST;
1692 pfk->registered |= (1<<hdr->sadb_msg_satype);
1693 }
1694
1695 xfrm_probe_algs();
1696
1697 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1698 if (!supp_skb) {
1699 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1700 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1701
1702 return -ENOBUFS;
1703 }
1704
1705 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1706 sock_net(sk));
1707 return 0;
1708 }
1709
1710 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1711 {
1712 struct sk_buff *skb;
1713 struct sadb_msg *hdr;
1714
1715 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1716 if (!skb)
1717 return -ENOBUFS;
1718
1719 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1720 hdr->sadb_msg_errno = (uint8_t) 0;
1721 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1722
1723 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1724 sock_net(sk));
1725 }
1726
1727 static int key_notify_sa_flush(const struct km_event *c)
1728 {
1729 struct sk_buff *skb;
1730 struct sadb_msg *hdr;
1731
1732 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1733 if (!skb)
1734 return -ENOBUFS;
1735 hdr = skb_put(skb, sizeof(struct sadb_msg));
1736 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1737 hdr->sadb_msg_type = SADB_FLUSH;
1738 hdr->sadb_msg_seq = c->seq;
1739 hdr->sadb_msg_pid = c->portid;
1740 hdr->sadb_msg_version = PF_KEY_V2;
1741 hdr->sadb_msg_errno = (uint8_t) 0;
1742 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1743 hdr->sadb_msg_reserved = 0;
1744
1745 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1746
1747 return 0;
1748 }
1749
1750 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1751 {
1752 struct net *net = sock_net(sk);
1753 unsigned int proto;
1754 struct km_event c;
1755 int err, err2;
1756
1757 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1758 if (proto == 0)
1759 return -EINVAL;
1760
1761 err = xfrm_state_flush(net, proto, true);
1762 err2 = unicast_flush_resp(sk, hdr);
1763 if (err || err2) {
1764 if (err == -ESRCH) /* empty table - go quietly */
1765 err = 0;
1766 return err ? err : err2;
1767 }
1768
1769 c.data.proto = proto;
1770 c.seq = hdr->sadb_msg_seq;
1771 c.portid = hdr->sadb_msg_pid;
1772 c.event = XFRM_MSG_FLUSHSA;
1773 c.net = net;
1774 km_state_notify(NULL, &c);
1775
1776 return 0;
1777 }
1778
1779 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1780 {
1781 struct pfkey_sock *pfk = ptr;
1782 struct sk_buff *out_skb;
1783 struct sadb_msg *out_hdr;
1784
1785 if (!pfkey_can_dump(&pfk->sk))
1786 return -ENOBUFS;
1787
1788 out_skb = pfkey_xfrm_state2msg(x);
1789 if (IS_ERR(out_skb))
1790 return PTR_ERR(out_skb);
1791
1792 out_hdr = (struct sadb_msg *) out_skb->data;
1793 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1794 out_hdr->sadb_msg_type = SADB_DUMP;
1795 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1796 out_hdr->sadb_msg_errno = 0;
1797 out_hdr->sadb_msg_reserved = 0;
1798 out_hdr->sadb_msg_seq = count + 1;
1799 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1800
1801 if (pfk->dump.skb)
1802 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1803 &pfk->sk, sock_net(&pfk->sk));
1804 pfk->dump.skb = out_skb;
1805
1806 return 0;
1807 }
1808
1809 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1810 {
1811 struct net *net = sock_net(&pfk->sk);
1812 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1813 }
1814
1815 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1816 {
1817 struct net *net = sock_net(&pfk->sk);
1818
1819 xfrm_state_walk_done(&pfk->dump.u.state, net);
1820 }
1821
1822 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1823 {
1824 u8 proto;
1825 struct xfrm_address_filter *filter = NULL;
1826 struct pfkey_sock *pfk = pfkey_sk(sk);
1827
1828 mutex_lock(&pfk->dump_lock);
1829 if (pfk->dump.dump != NULL) {
1830 mutex_unlock(&pfk->dump_lock);
1831 return -EBUSY;
1832 }
1833
1834 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1835 if (proto == 0) {
1836 mutex_unlock(&pfk->dump_lock);
1837 return -EINVAL;
1838 }
1839
1840 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1841 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1842
1843 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1844 if (filter == NULL) {
1845 mutex_unlock(&pfk->dump_lock);
1846 return -ENOMEM;
1847 }
1848
1849 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1850 sizeof(xfrm_address_t));
1851 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1852 sizeof(xfrm_address_t));
1853 filter->family = xfilter->sadb_x_filter_family;
1854 filter->splen = xfilter->sadb_x_filter_splen;
1855 filter->dplen = xfilter->sadb_x_filter_dplen;
1856 }
1857
1858 pfk->dump.msg_version = hdr->sadb_msg_version;
1859 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1860 pfk->dump.dump = pfkey_dump_sa;
1861 pfk->dump.done = pfkey_dump_sa_done;
1862 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1863 mutex_unlock(&pfk->dump_lock);
1864
1865 return pfkey_do_dump(pfk);
1866 }
1867
1868 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1869 {
1870 struct pfkey_sock *pfk = pfkey_sk(sk);
1871 int satype = hdr->sadb_msg_satype;
1872 bool reset_errno = false;
1873
1874 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1875 reset_errno = true;
1876 if (satype != 0 && satype != 1)
1877 return -EINVAL;
1878 pfk->promisc = satype;
1879 }
1880 if (reset_errno && skb_cloned(skb))
1881 skb = skb_copy(skb, GFP_KERNEL);
1882 else
1883 skb = skb_clone(skb, GFP_KERNEL);
1884
1885 if (reset_errno && skb) {
1886 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1887 new_hdr->sadb_msg_errno = 0;
1888 }
1889
1890 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1891 return 0;
1892 }
1893
1894 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1895 {
1896 int i;
1897 u32 reqid = *(u32*)ptr;
1898
1899 for (i=0; i<xp->xfrm_nr; i++) {
1900 if (xp->xfrm_vec[i].reqid == reqid)
1901 return -EEXIST;
1902 }
1903 return 0;
1904 }
1905
1906 static u32 gen_reqid(struct net *net)
1907 {
1908 struct xfrm_policy_walk walk;
1909 u32 start;
1910 int rc;
1911 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1912
1913 start = reqid;
1914 do {
1915 ++reqid;
1916 if (reqid == 0)
1917 reqid = IPSEC_MANUAL_REQID_MAX+1;
1918 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1919 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1920 xfrm_policy_walk_done(&walk, net);
1921 if (rc != -EEXIST)
1922 return reqid;
1923 } while (reqid != start);
1924 return 0;
1925 }
1926
1927 static int
1928 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1929 {
1930 struct net *net = xp_net(xp);
1931 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1932 int mode;
1933
1934 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1935 return -ELOOP;
1936
1937 if (rq->sadb_x_ipsecrequest_mode == 0)
1938 return -EINVAL;
1939
1940 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1941 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1942 return -EINVAL;
1943 t->mode = mode;
1944 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1945 t->optional = 1;
1946 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1947 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1948 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1949 t->reqid = 0;
1950 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1951 return -ENOBUFS;
1952 }
1953
1954 /* addresses present only in tunnel mode */
1955 if (t->mode == XFRM_MODE_TUNNEL) {
1956 int err;
1957
1958 err = parse_sockaddr_pair(
1959 (struct sockaddr *)(rq + 1),
1960 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1961 &t->saddr, &t->id.daddr, &t->encap_family);
1962 if (err)
1963 return err;
1964 } else
1965 t->encap_family = xp->family;
1966
1967 /* No way to set this via kame pfkey */
1968 t->allalgs = 1;
1969 xp->xfrm_nr++;
1970 return 0;
1971 }
1972
1973 static int
1974 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1975 {
1976 int err;
1977 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1978 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1979
1980 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1981 return -EINVAL;
1982
1983 while (len >= sizeof(*rq)) {
1984 if (len < rq->sadb_x_ipsecrequest_len ||
1985 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1986 return -EINVAL;
1987
1988 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1989 return err;
1990 len -= rq->sadb_x_ipsecrequest_len;
1991 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1992 }
1993 return 0;
1994 }
1995
1996 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1997 {
1998 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1999
2000 if (xfrm_ctx) {
2001 int len = sizeof(struct sadb_x_sec_ctx);
2002 len += xfrm_ctx->ctx_len;
2003 return PFKEY_ALIGN8(len);
2004 }
2005 return 0;
2006 }
2007
2008 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2009 {
2010 const struct xfrm_tmpl *t;
2011 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2012 int socklen = 0;
2013 int i;
2014
2015 for (i=0; i<xp->xfrm_nr; i++) {
2016 t = xp->xfrm_vec + i;
2017 socklen += pfkey_sockaddr_len(t->encap_family);
2018 }
2019
2020 return sizeof(struct sadb_msg) +
2021 (sizeof(struct sadb_lifetime) * 3) +
2022 (sizeof(struct sadb_address) * 2) +
2023 (sockaddr_size * 2) +
2024 sizeof(struct sadb_x_policy) +
2025 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2026 (socklen * 2) +
2027 pfkey_xfrm_policy2sec_ctx_size(xp);
2028 }
2029
2030 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2031 {
2032 struct sk_buff *skb;
2033 int size;
2034
2035 size = pfkey_xfrm_policy2msg_size(xp);
2036
2037 skb = alloc_skb(size + 16, GFP_ATOMIC);
2038 if (skb == NULL)
2039 return ERR_PTR(-ENOBUFS);
2040
2041 return skb;
2042 }
2043
2044 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2045 {
2046 struct sadb_msg *hdr;
2047 struct sadb_address *addr;
2048 struct sadb_lifetime *lifetime;
2049 struct sadb_x_policy *pol;
2050 struct sadb_x_sec_ctx *sec_ctx;
2051 struct xfrm_sec_ctx *xfrm_ctx;
2052 int i;
2053 int size;
2054 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2055 int socklen = pfkey_sockaddr_len(xp->family);
2056
2057 size = pfkey_xfrm_policy2msg_size(xp);
2058
2059 /* call should fill header later */
2060 hdr = skb_put(skb, sizeof(struct sadb_msg));
2061 memset(hdr, 0, size); /* XXX do we need this ? */
2062
2063 /* src address */
2064 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2065 addr->sadb_address_len =
2066 (sizeof(struct sadb_address)+sockaddr_size)/
2067 sizeof(uint64_t);
2068 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2069 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2070 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2071 addr->sadb_address_reserved = 0;
2072 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2073 xp->selector.sport,
2074 (struct sockaddr *) (addr + 1),
2075 xp->family))
2076 BUG();
2077
2078 /* dst address */
2079 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2080 addr->sadb_address_len =
2081 (sizeof(struct sadb_address)+sockaddr_size)/
2082 sizeof(uint64_t);
2083 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2084 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2085 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2086 addr->sadb_address_reserved = 0;
2087
2088 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2089 (struct sockaddr *) (addr + 1),
2090 xp->family);
2091
2092 /* hard time */
2093 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2094 lifetime->sadb_lifetime_len =
2095 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2096 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2097 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2098 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2099 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2100 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2101 /* soft time */
2102 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2103 lifetime->sadb_lifetime_len =
2104 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2105 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2106 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2107 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2108 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2109 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2110 /* current time */
2111 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2112 lifetime->sadb_lifetime_len =
2113 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2114 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2115 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2116 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2117 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2118 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2119
2120 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2121 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2122 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2123 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2124 if (xp->action == XFRM_POLICY_ALLOW) {
2125 if (xp->xfrm_nr)
2126 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2127 else
2128 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2129 }
2130 pol->sadb_x_policy_dir = dir+1;
2131 pol->sadb_x_policy_reserved = 0;
2132 pol->sadb_x_policy_id = xp->index;
2133 pol->sadb_x_policy_priority = xp->priority;
2134
2135 for (i=0; i<xp->xfrm_nr; i++) {
2136 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2137 struct sadb_x_ipsecrequest *rq;
2138 int req_size;
2139 int mode;
2140
2141 req_size = sizeof(struct sadb_x_ipsecrequest);
2142 if (t->mode == XFRM_MODE_TUNNEL) {
2143 socklen = pfkey_sockaddr_len(t->encap_family);
2144 req_size += socklen * 2;
2145 } else {
2146 size -= 2*socklen;
2147 }
2148 rq = skb_put(skb, req_size);
2149 pol->sadb_x_policy_len += req_size/8;
2150 memset(rq, 0, sizeof(*rq));
2151 rq->sadb_x_ipsecrequest_len = req_size;
2152 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2153 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2154 return -EINVAL;
2155 rq->sadb_x_ipsecrequest_mode = mode;
2156 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2157 if (t->reqid)
2158 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2159 if (t->optional)
2160 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2161 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2162
2163 if (t->mode == XFRM_MODE_TUNNEL) {
2164 u8 *sa = (void *)(rq + 1);
2165 pfkey_sockaddr_fill(&t->saddr, 0,
2166 (struct sockaddr *)sa,
2167 t->encap_family);
2168 pfkey_sockaddr_fill(&t->id.daddr, 0,
2169 (struct sockaddr *) (sa + socklen),
2170 t->encap_family);
2171 }
2172 }
2173
2174 /* security context */
2175 if ((xfrm_ctx = xp->security)) {
2176 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2177
2178 sec_ctx = skb_put(skb, ctx_size);
2179 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2180 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2181 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2182 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2183 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2184 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2185 xfrm_ctx->ctx_len);
2186 }
2187
2188 hdr->sadb_msg_len = size / sizeof(uint64_t);
2189 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2190
2191 return 0;
2192 }
2193
2194 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2195 {
2196 struct sk_buff *out_skb;
2197 struct sadb_msg *out_hdr;
2198 int err;
2199
2200 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2201 if (IS_ERR(out_skb))
2202 return PTR_ERR(out_skb);
2203
2204 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2205 if (err < 0) {
2206 kfree_skb(out_skb);
2207 return err;
2208 }
2209
2210 out_hdr = (struct sadb_msg *) out_skb->data;
2211 out_hdr->sadb_msg_version = PF_KEY_V2;
2212
2213 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2214 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2215 else
2216 out_hdr->sadb_msg_type = event2poltype(c->event);
2217 out_hdr->sadb_msg_errno = 0;
2218 out_hdr->sadb_msg_seq = c->seq;
2219 out_hdr->sadb_msg_pid = c->portid;
2220 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2221 return 0;
2222
2223 }
2224
2225 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2226 {
2227 struct net *net = sock_net(sk);
2228 int err = 0;
2229 struct sadb_lifetime *lifetime;
2230 struct sadb_address *sa;
2231 struct sadb_x_policy *pol;
2232 struct xfrm_policy *xp;
2233 struct km_event c;
2234 struct sadb_x_sec_ctx *sec_ctx;
2235
2236 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2237 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2238 !ext_hdrs[SADB_X_EXT_POLICY-1])
2239 return -EINVAL;
2240
2241 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2242 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2243 return -EINVAL;
2244 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2245 return -EINVAL;
2246
2247 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2248 if (xp == NULL)
2249 return -ENOBUFS;
2250
2251 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2252 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2253 xp->priority = pol->sadb_x_policy_priority;
2254
2255 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2256 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2257 xp->selector.family = xp->family;
2258 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2259 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2260 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2261 if (xp->selector.sport)
2262 xp->selector.sport_mask = htons(0xffff);
2263
2264 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2265 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2266 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2267
2268 /* Amusing, we set this twice. KAME apps appear to set same value
2269 * in both addresses.
2270 */
2271 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2272
2273 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2274 if (xp->selector.dport)
2275 xp->selector.dport_mask = htons(0xffff);
2276
2277 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2278 if (sec_ctx != NULL) {
2279 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2280
2281 if (!uctx) {
2282 err = -ENOBUFS;
2283 goto out;
2284 }
2285
2286 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2287 kfree(uctx);
2288
2289 if (err)
2290 goto out;
2291 }
2292
2293 xp->lft.soft_byte_limit = XFRM_INF;
2294 xp->lft.hard_byte_limit = XFRM_INF;
2295 xp->lft.soft_packet_limit = XFRM_INF;
2296 xp->lft.hard_packet_limit = XFRM_INF;
2297 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2298 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2299 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2300 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2301 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2302 }
2303 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2304 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2305 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2306 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2307 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2308 }
2309 xp->xfrm_nr = 0;
2310 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2311 (err = parse_ipsecrequests(xp, pol)) < 0)
2312 goto out;
2313
2314 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2315 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2316
2317 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2318
2319 if (err)
2320 goto out;
2321
2322 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2323 c.event = XFRM_MSG_UPDPOLICY;
2324 else
2325 c.event = XFRM_MSG_NEWPOLICY;
2326
2327 c.seq = hdr->sadb_msg_seq;
2328 c.portid = hdr->sadb_msg_pid;
2329
2330 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2331 xfrm_pol_put(xp);
2332 return 0;
2333
2334 out:
2335 xp->walk.dead = 1;
2336 xfrm_policy_destroy(xp);
2337 return err;
2338 }
2339
2340 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2341 {
2342 struct net *net = sock_net(sk);
2343 int err;
2344 struct sadb_address *sa;
2345 struct sadb_x_policy *pol;
2346 struct xfrm_policy *xp;
2347 struct xfrm_selector sel;
2348 struct km_event c;
2349 struct sadb_x_sec_ctx *sec_ctx;
2350 struct xfrm_sec_ctx *pol_ctx = NULL;
2351
2352 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2353 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2354 !ext_hdrs[SADB_X_EXT_POLICY-1])
2355 return -EINVAL;
2356
2357 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2358 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2359 return -EINVAL;
2360
2361 memset(&sel, 0, sizeof(sel));
2362
2363 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2364 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2365 sel.prefixlen_s = sa->sadb_address_prefixlen;
2366 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2367 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2368 if (sel.sport)
2369 sel.sport_mask = htons(0xffff);
2370
2371 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2372 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2373 sel.prefixlen_d = sa->sadb_address_prefixlen;
2374 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2375 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2376 if (sel.dport)
2377 sel.dport_mask = htons(0xffff);
2378
2379 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2380 if (sec_ctx != NULL) {
2381 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2382
2383 if (!uctx)
2384 return -ENOMEM;
2385
2386 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2387 kfree(uctx);
2388 if (err)
2389 return err;
2390 }
2391
2392 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2393 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2394 1, &err);
2395 security_xfrm_policy_free(pol_ctx);
2396 if (xp == NULL)
2397 return -ENOENT;
2398
2399 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2400
2401 if (err)
2402 goto out;
2403
2404 c.seq = hdr->sadb_msg_seq;
2405 c.portid = hdr->sadb_msg_pid;
2406 c.data.byid = 0;
2407 c.event = XFRM_MSG_DELPOLICY;
2408 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2409
2410 out:
2411 xfrm_pol_put(xp);
2412 return err;
2413 }
2414
2415 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2416 {
2417 int err;
2418 struct sk_buff *out_skb;
2419 struct sadb_msg *out_hdr;
2420 err = 0;
2421
2422 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2423 if (IS_ERR(out_skb)) {
2424 err = PTR_ERR(out_skb);
2425 goto out;
2426 }
2427 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2428 if (err < 0)
2429 goto out;
2430
2431 out_hdr = (struct sadb_msg *) out_skb->data;
2432 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2433 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2434 out_hdr->sadb_msg_satype = 0;
2435 out_hdr->sadb_msg_errno = 0;
2436 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2437 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2438 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2439 err = 0;
2440
2441 out:
2442 return err;
2443 }
2444
2445 static int pfkey_sockaddr_pair_size(sa_family_t family)
2446 {
2447 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2448 }
2449
2450 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2451 xfrm_address_t *saddr, xfrm_address_t *daddr,
2452 u16 *family)
2453 {
2454 int af, socklen;
2455
2456 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2457 return -EINVAL;
2458
2459 af = pfkey_sockaddr_extract(sa, saddr);
2460 if (!af)
2461 return -EINVAL;
2462
2463 socklen = pfkey_sockaddr_len(af);
2464 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2465 daddr) != af)
2466 return -EINVAL;
2467
2468 *family = af;
2469 return 0;
2470 }
2471
2472 #ifdef CONFIG_NET_KEY_MIGRATE
2473 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2474 struct xfrm_migrate *m)
2475 {
2476 int err;
2477 struct sadb_x_ipsecrequest *rq2;
2478 int mode;
2479
2480 if (len < sizeof(*rq1) ||
2481 len < rq1->sadb_x_ipsecrequest_len ||
2482 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2483 return -EINVAL;
2484
2485 /* old endoints */
2486 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2487 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2488 &m->old_saddr, &m->old_daddr,
2489 &m->old_family);
2490 if (err)
2491 return err;
2492
2493 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2494 len -= rq1->sadb_x_ipsecrequest_len;
2495
2496 if (len <= sizeof(*rq2) ||
2497 len < rq2->sadb_x_ipsecrequest_len ||
2498 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2499 return -EINVAL;
2500
2501 /* new endpoints */
2502 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2503 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2504 &m->new_saddr, &m->new_daddr,
2505 &m->new_family);
2506 if (err)
2507 return err;
2508
2509 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2510 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2511 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2512 return -EINVAL;
2513
2514 m->proto = rq1->sadb_x_ipsecrequest_proto;
2515 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2516 return -EINVAL;
2517 m->mode = mode;
2518 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2519
2520 return ((int)(rq1->sadb_x_ipsecrequest_len +
2521 rq2->sadb_x_ipsecrequest_len));
2522 }
2523
2524 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2525 const struct sadb_msg *hdr, void * const *ext_hdrs)
2526 {
2527 int i, len, ret, err = -EINVAL;
2528 u8 dir;
2529 struct sadb_address *sa;
2530 struct sadb_x_kmaddress *kma;
2531 struct sadb_x_policy *pol;
2532 struct sadb_x_ipsecrequest *rq;
2533 struct xfrm_selector sel;
2534 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2535 struct xfrm_kmaddress k;
2536 struct net *net = sock_net(sk);
2537
2538 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2539 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2540 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2541 err = -EINVAL;
2542 goto out;
2543 }
2544
2545 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2546 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2547
2548 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2549 err = -EINVAL;
2550 goto out;
2551 }
2552
2553 if (kma) {
2554 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2555 k.reserved = kma->sadb_x_kmaddress_reserved;
2556 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2557 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2558 &k.local, &k.remote, &k.family);
2559 if (ret < 0) {
2560 err = ret;
2561 goto out;
2562 }
2563 }
2564
2565 dir = pol->sadb_x_policy_dir - 1;
2566 memset(&sel, 0, sizeof(sel));
2567
2568 /* set source address info of selector */
2569 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2570 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2571 sel.prefixlen_s = sa->sadb_address_prefixlen;
2572 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2573 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2574 if (sel.sport)
2575 sel.sport_mask = htons(0xffff);
2576
2577 /* set destination address info of selector */
2578 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2579 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2580 sel.prefixlen_d = sa->sadb_address_prefixlen;
2581 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2582 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2583 if (sel.dport)
2584 sel.dport_mask = htons(0xffff);
2585
2586 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2587
2588 /* extract ipsecrequests */
2589 i = 0;
2590 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2591
2592 while (len > 0 && i < XFRM_MAX_DEPTH) {
2593 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2594 if (ret < 0) {
2595 err = ret;
2596 goto out;
2597 } else {
2598 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2599 len -= ret;
2600 i++;
2601 }
2602 }
2603
2604 if (!i || len > 0) {
2605 err = -EINVAL;
2606 goto out;
2607 }
2608
2609 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2610 kma ? &k : NULL, net, NULL);
2611
2612 out:
2613 return err;
2614 }
2615 #else
2616 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2617 const struct sadb_msg *hdr, void * const *ext_hdrs)
2618 {
2619 return -ENOPROTOOPT;
2620 }
2621 #endif
2622
2623
2624 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2625 {
2626 struct net *net = sock_net(sk);
2627 unsigned int dir;
2628 int err = 0, delete;
2629 struct sadb_x_policy *pol;
2630 struct xfrm_policy *xp;
2631 struct km_event c;
2632
2633 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2634 return -EINVAL;
2635
2636 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2637 if (dir >= XFRM_POLICY_MAX)
2638 return -EINVAL;
2639
2640 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2641 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2642 dir, pol->sadb_x_policy_id, delete, &err);
2643 if (xp == NULL)
2644 return -ENOENT;
2645
2646 if (delete) {
2647 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2648
2649 if (err)
2650 goto out;
2651 c.seq = hdr->sadb_msg_seq;
2652 c.portid = hdr->sadb_msg_pid;
2653 c.data.byid = 1;
2654 c.event = XFRM_MSG_DELPOLICY;
2655 km_policy_notify(xp, dir, &c);
2656 } else {
2657 err = key_pol_get_resp(sk, xp, hdr, dir);
2658 }
2659
2660 out:
2661 xfrm_pol_put(xp);
2662 return err;
2663 }
2664
2665 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2666 {
2667 struct pfkey_sock *pfk = ptr;
2668 struct sk_buff *out_skb;
2669 struct sadb_msg *out_hdr;
2670 int err;
2671
2672 if (!pfkey_can_dump(&pfk->sk))
2673 return -ENOBUFS;
2674
2675 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2676 if (IS_ERR(out_skb))
2677 return PTR_ERR(out_skb);
2678
2679 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2680 if (err < 0)
2681 return err;
2682
2683 out_hdr = (struct sadb_msg *) out_skb->data;
2684 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2685 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2686 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2687 out_hdr->sadb_msg_errno = 0;
2688 out_hdr->sadb_msg_seq = count + 1;
2689 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2690
2691 if (pfk->dump.skb)
2692 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2693 &pfk->sk, sock_net(&pfk->sk));
2694 pfk->dump.skb = out_skb;
2695
2696 return 0;
2697 }
2698
2699 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2700 {
2701 struct net *net = sock_net(&pfk->sk);
2702 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2703 }
2704
2705 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2706 {
2707 struct net *net = sock_net((struct sock *)pfk);
2708
2709 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2710 }
2711
2712 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2713 {
2714 struct pfkey_sock *pfk = pfkey_sk(sk);
2715
2716 mutex_lock(&pfk->dump_lock);
2717 if (pfk->dump.dump != NULL) {
2718 mutex_unlock(&pfk->dump_lock);
2719 return -EBUSY;
2720 }
2721
2722 pfk->dump.msg_version = hdr->sadb_msg_version;
2723 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2724 pfk->dump.dump = pfkey_dump_sp;
2725 pfk->dump.done = pfkey_dump_sp_done;
2726 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2727 mutex_unlock(&pfk->dump_lock);
2728
2729 return pfkey_do_dump(pfk);
2730 }
2731
2732 static int key_notify_policy_flush(const struct km_event *c)
2733 {
2734 struct sk_buff *skb_out;
2735 struct sadb_msg *hdr;
2736
2737 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2738 if (!skb_out)
2739 return -ENOBUFS;
2740 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2741 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2742 hdr->sadb_msg_seq = c->seq;
2743 hdr->sadb_msg_pid = c->portid;
2744 hdr->sadb_msg_version = PF_KEY_V2;
2745 hdr->sadb_msg_errno = (uint8_t) 0;
2746 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2747 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2748 hdr->sadb_msg_reserved = 0;
2749 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2750 return 0;
2751
2752 }
2753
2754 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2755 {
2756 struct net *net = sock_net(sk);
2757 struct km_event c;
2758 int err, err2;
2759
2760 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2761 err2 = unicast_flush_resp(sk, hdr);
2762 if (err || err2) {
2763 if (err == -ESRCH) /* empty table - old silent behavior */
2764 return 0;
2765 return err;
2766 }
2767
2768 c.data.type = XFRM_POLICY_TYPE_MAIN;
2769 c.event = XFRM_MSG_FLUSHPOLICY;
2770 c.portid = hdr->sadb_msg_pid;
2771 c.seq = hdr->sadb_msg_seq;
2772 c.net = net;
2773 km_policy_notify(NULL, 0, &c);
2774
2775 return 0;
2776 }
2777
2778 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2779 const struct sadb_msg *hdr, void * const *ext_hdrs);
2780 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2781 [SADB_RESERVED] = pfkey_reserved,
2782 [SADB_GETSPI] = pfkey_getspi,
2783 [SADB_UPDATE] = pfkey_add,
2784 [SADB_ADD] = pfkey_add,
2785 [SADB_DELETE] = pfkey_delete,
2786 [SADB_GET] = pfkey_get,
2787 [SADB_ACQUIRE] = pfkey_acquire,
2788 [SADB_REGISTER] = pfkey_register,
2789 [SADB_EXPIRE] = NULL,
2790 [SADB_FLUSH] = pfkey_flush,
2791 [SADB_DUMP] = pfkey_dump,
2792 [SADB_X_PROMISC] = pfkey_promisc,
2793 [SADB_X_PCHANGE] = NULL,
2794 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2795 [SADB_X_SPDADD] = pfkey_spdadd,
2796 [SADB_X_SPDDELETE] = pfkey_spddelete,
2797 [SADB_X_SPDGET] = pfkey_spdget,
2798 [SADB_X_SPDACQUIRE] = NULL,
2799 [SADB_X_SPDDUMP] = pfkey_spddump,
2800 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2801 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2802 [SADB_X_SPDDELETE2] = pfkey_spdget,
2803 [SADB_X_MIGRATE] = pfkey_migrate,
2804 };
2805
2806 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2807 {
2808 void *ext_hdrs[SADB_EXT_MAX];
2809 int err;
2810
2811 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2812 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2813
2814 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2815 err = parse_exthdrs(skb, hdr, ext_hdrs);
2816 if (!err) {
2817 err = -EOPNOTSUPP;
2818 if (pfkey_funcs[hdr->sadb_msg_type])
2819 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2820 }
2821 return err;
2822 }
2823
2824 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2825 {
2826 struct sadb_msg *hdr = NULL;
2827
2828 if (skb->len < sizeof(*hdr)) {
2829 *errp = -EMSGSIZE;
2830 } else {
2831 hdr = (struct sadb_msg *) skb->data;
2832 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2833 hdr->sadb_msg_reserved != 0 ||
2834 (hdr->sadb_msg_type <= SADB_RESERVED ||
2835 hdr->sadb_msg_type > SADB_MAX)) {
2836 hdr = NULL;
2837 *errp = -EINVAL;
2838 } else if (hdr->sadb_msg_len != (skb->len /
2839 sizeof(uint64_t)) ||
2840 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2841 sizeof(uint64_t))) {
2842 hdr = NULL;
2843 *errp = -EMSGSIZE;
2844 } else {
2845 *errp = 0;
2846 }
2847 }
2848 return hdr;
2849 }
2850
2851 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2852 const struct xfrm_algo_desc *d)
2853 {
2854 unsigned int id = d->desc.sadb_alg_id;
2855
2856 if (id >= sizeof(t->aalgos) * 8)
2857 return 0;
2858
2859 return (t->aalgos >> id) & 1;
2860 }
2861
2862 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2863 const struct xfrm_algo_desc *d)
2864 {
2865 unsigned int id = d->desc.sadb_alg_id;
2866
2867 if (id >= sizeof(t->ealgos) * 8)
2868 return 0;
2869
2870 return (t->ealgos >> id) & 1;
2871 }
2872
2873 static int count_ah_combs(const struct xfrm_tmpl *t)
2874 {
2875 int i, sz = 0;
2876
2877 for (i = 0; ; i++) {
2878 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2879 if (!aalg)
2880 break;
2881 if (!aalg->pfkey_supported)
2882 continue;
2883 if (aalg_tmpl_set(t, aalg) && aalg->available)
2884 sz += sizeof(struct sadb_comb);
2885 }
2886 return sz + sizeof(struct sadb_prop);
2887 }
2888
2889 static int count_esp_combs(const struct xfrm_tmpl *t)
2890 {
2891 int i, k, sz = 0;
2892
2893 for (i = 0; ; i++) {
2894 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2895 if (!ealg)
2896 break;
2897
2898 if (!ealg->pfkey_supported)
2899 continue;
2900
2901 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2902 continue;
2903
2904 for (k = 1; ; k++) {
2905 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2906 if (!aalg)
2907 break;
2908
2909 if (!aalg->pfkey_supported)
2910 continue;
2911
2912 if (aalg_tmpl_set(t, aalg) && aalg->available)
2913 sz += sizeof(struct sadb_comb);
2914 }
2915 }
2916 return sz + sizeof(struct sadb_prop);
2917 }
2918
2919 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2920 {
2921 struct sadb_prop *p;
2922 int i;
2923
2924 p = skb_put(skb, sizeof(struct sadb_prop));
2925 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2926 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2927 p->sadb_prop_replay = 32;
2928 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2929
2930 for (i = 0; ; i++) {
2931 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2932 if (!aalg)
2933 break;
2934
2935 if (!aalg->pfkey_supported)
2936 continue;
2937
2938 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2939 struct sadb_comb *c;
2940 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2941 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2942 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2943 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2944 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2945 c->sadb_comb_hard_addtime = 24*60*60;
2946 c->sadb_comb_soft_addtime = 20*60*60;
2947 c->sadb_comb_hard_usetime = 8*60*60;
2948 c->sadb_comb_soft_usetime = 7*60*60;
2949 }
2950 }
2951 }
2952
2953 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2954 {
2955 struct sadb_prop *p;
2956 int i, k;
2957
2958 p = skb_put(skb, sizeof(struct sadb_prop));
2959 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2960 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2961 p->sadb_prop_replay = 32;
2962 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2963
2964 for (i=0; ; i++) {
2965 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2966 if (!ealg)
2967 break;
2968
2969 if (!ealg->pfkey_supported)
2970 continue;
2971
2972 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2973 continue;
2974
2975 for (k = 1; ; k++) {
2976 struct sadb_comb *c;
2977 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2978 if (!aalg)
2979 break;
2980 if (!aalg->pfkey_supported)
2981 continue;
2982 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2983 continue;
2984 c = skb_put(skb, sizeof(struct sadb_comb));
2985 memset(c, 0, sizeof(*c));
2986 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2987 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2988 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2989 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2990 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2991 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2992 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2993 c->sadb_comb_hard_addtime = 24*60*60;
2994 c->sadb_comb_soft_addtime = 20*60*60;
2995 c->sadb_comb_hard_usetime = 8*60*60;
2996 c->sadb_comb_soft_usetime = 7*60*60;
2997 }
2998 }
2999 }
3000
3001 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3002 {
3003 return 0;
3004 }
3005
3006 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3007 {
3008 struct sk_buff *out_skb;
3009 struct sadb_msg *out_hdr;
3010 int hard;
3011 int hsc;
3012
3013 hard = c->data.hard;
3014 if (hard)
3015 hsc = 2;
3016 else
3017 hsc = 1;
3018
3019 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3020 if (IS_ERR(out_skb))
3021 return PTR_ERR(out_skb);
3022
3023 out_hdr = (struct sadb_msg *) out_skb->data;
3024 out_hdr->sadb_msg_version = PF_KEY_V2;
3025 out_hdr->sadb_msg_type = SADB_EXPIRE;
3026 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3027 out_hdr->sadb_msg_errno = 0;
3028 out_hdr->sadb_msg_reserved = 0;
3029 out_hdr->sadb_msg_seq = 0;
3030 out_hdr->sadb_msg_pid = 0;
3031
3032 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3033 xs_net(x));
3034 return 0;
3035 }
3036
3037 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3038 {
3039 struct net *net = x ? xs_net(x) : c->net;
3040 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3041
3042 if (atomic_read(&net_pfkey->socks_nr) == 0)
3043 return 0;
3044
3045 switch (c->event) {
3046 case XFRM_MSG_EXPIRE:
3047 return key_notify_sa_expire(x, c);
3048 case XFRM_MSG_DELSA:
3049 case XFRM_MSG_NEWSA:
3050 case XFRM_MSG_UPDSA:
3051 return key_notify_sa(x, c);
3052 case XFRM_MSG_FLUSHSA:
3053 return key_notify_sa_flush(c);
3054 case XFRM_MSG_NEWAE: /* not yet supported */
3055 break;
3056 default:
3057 pr_err("pfkey: Unknown SA event %d\n", c->event);
3058 break;
3059 }
3060
3061 return 0;
3062 }
3063
3064 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3065 {
3066 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3067 return 0;
3068
3069 switch (c->event) {
3070 case XFRM_MSG_POLEXPIRE:
3071 return key_notify_policy_expire(xp, c);
3072 case XFRM_MSG_DELPOLICY:
3073 case XFRM_MSG_NEWPOLICY:
3074 case XFRM_MSG_UPDPOLICY:
3075 return key_notify_policy(xp, dir, c);
3076 case XFRM_MSG_FLUSHPOLICY:
3077 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3078 break;
3079 return key_notify_policy_flush(c);
3080 default:
3081 pr_err("pfkey: Unknown policy event %d\n", c->event);
3082 break;
3083 }
3084
3085 return 0;
3086 }
3087
3088 static u32 get_acqseq(void)
3089 {
3090 u32 res;
3091 static atomic_t acqseq;
3092
3093 do {
3094 res = atomic_inc_return(&acqseq);
3095 } while (!res);
3096 return res;
3097 }
3098
3099 static bool pfkey_is_alive(const struct km_event *c)
3100 {
3101 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3102 struct sock *sk;
3103 bool is_alive = false;
3104
3105 rcu_read_lock();
3106 sk_for_each_rcu(sk, &net_pfkey->table) {
3107 if (pfkey_sk(sk)->registered) {
3108 is_alive = true;
3109 break;
3110 }
3111 }
3112 rcu_read_unlock();
3113
3114 return is_alive;
3115 }
3116
3117 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3118 {
3119 struct sk_buff *skb;
3120 struct sadb_msg *hdr;
3121 struct sadb_address *addr;
3122 struct sadb_x_policy *pol;
3123 int sockaddr_size;
3124 int size;
3125 struct sadb_x_sec_ctx *sec_ctx;
3126 struct xfrm_sec_ctx *xfrm_ctx;
3127 int ctx_size = 0;
3128
3129 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3130 if (!sockaddr_size)
3131 return -EINVAL;
3132
3133 size = sizeof(struct sadb_msg) +
3134 (sizeof(struct sadb_address) * 2) +
3135 (sockaddr_size * 2) +
3136 sizeof(struct sadb_x_policy);
3137
3138 if (x->id.proto == IPPROTO_AH)
3139 size += count_ah_combs(t);
3140 else if (x->id.proto == IPPROTO_ESP)
3141 size += count_esp_combs(t);
3142
3143 if ((xfrm_ctx = x->security)) {
3144 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3145 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3146 }
3147
3148 skb = alloc_skb(size + 16, GFP_ATOMIC);
3149 if (skb == NULL)
3150 return -ENOMEM;
3151
3152 hdr = skb_put(skb, sizeof(struct sadb_msg));
3153 hdr->sadb_msg_version = PF_KEY_V2;
3154 hdr->sadb_msg_type = SADB_ACQUIRE;
3155 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3156 hdr->sadb_msg_len = size / sizeof(uint64_t);
3157 hdr->sadb_msg_errno = 0;
3158 hdr->sadb_msg_reserved = 0;
3159 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3160 hdr->sadb_msg_pid = 0;
3161
3162 /* src address */
3163 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3164 addr->sadb_address_len =
3165 (sizeof(struct sadb_address)+sockaddr_size)/
3166 sizeof(uint64_t);
3167 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3168 addr->sadb_address_proto = 0;
3169 addr->sadb_address_reserved = 0;
3170 addr->sadb_address_prefixlen =
3171 pfkey_sockaddr_fill(&x->props.saddr, 0,
3172 (struct sockaddr *) (addr + 1),
3173 x->props.family);
3174 if (!addr->sadb_address_prefixlen)
3175 BUG();
3176
3177 /* dst address */
3178 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3179 addr->sadb_address_len =
3180 (sizeof(struct sadb_address)+sockaddr_size)/
3181 sizeof(uint64_t);
3182 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3183 addr->sadb_address_proto = 0;
3184 addr->sadb_address_reserved = 0;
3185 addr->sadb_address_prefixlen =
3186 pfkey_sockaddr_fill(&x->id.daddr, 0,
3187 (struct sockaddr *) (addr + 1),
3188 x->props.family);
3189 if (!addr->sadb_address_prefixlen)
3190 BUG();
3191
3192 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3193 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3194 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3195 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3196 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3197 pol->sadb_x_policy_reserved = 0;
3198 pol->sadb_x_policy_id = xp->index;
3199 pol->sadb_x_policy_priority = xp->priority;
3200
3201 /* Set sadb_comb's. */
3202 if (x->id.proto == IPPROTO_AH)
3203 dump_ah_combs(skb, t);
3204 else if (x->id.proto == IPPROTO_ESP)
3205 dump_esp_combs(skb, t);
3206
3207 /* security context */
3208 if (xfrm_ctx) {
3209 sec_ctx = skb_put(skb,
3210 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3211 sec_ctx->sadb_x_sec_len =
3212 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3213 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3214 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3215 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3216 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3217 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3218 xfrm_ctx->ctx_len);
3219 }
3220
3221 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3222 xs_net(x));
3223 }
3224
3225 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3226 u8 *data, int len, int *dir)
3227 {
3228 struct net *net = sock_net(sk);
3229 struct xfrm_policy *xp;
3230 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3231 struct sadb_x_sec_ctx *sec_ctx;
3232
3233 switch (sk->sk_family) {
3234 case AF_INET:
3235 if (opt != IP_IPSEC_POLICY) {
3236 *dir = -EOPNOTSUPP;
3237 return NULL;
3238 }
3239 break;
3240 #if IS_ENABLED(CONFIG_IPV6)
3241 case AF_INET6:
3242 if (opt != IPV6_IPSEC_POLICY) {
3243 *dir = -EOPNOTSUPP;
3244 return NULL;
3245 }
3246 break;
3247 #endif
3248 default:
3249 *dir = -EINVAL;
3250 return NULL;
3251 }
3252
3253 *dir = -EINVAL;
3254
3255 if (len < sizeof(struct sadb_x_policy) ||
3256 pol->sadb_x_policy_len*8 > len ||
3257 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3258 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3259 return NULL;
3260
3261 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3262 if (xp == NULL) {
3263 *dir = -ENOBUFS;
3264 return NULL;
3265 }
3266
3267 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3268 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3269
3270 xp->lft.soft_byte_limit = XFRM_INF;
3271 xp->lft.hard_byte_limit = XFRM_INF;
3272 xp->lft.soft_packet_limit = XFRM_INF;
3273 xp->lft.hard_packet_limit = XFRM_INF;
3274 xp->family = sk->sk_family;
3275
3276 xp->xfrm_nr = 0;
3277 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3278 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3279 goto out;
3280
3281 /* security context too */
3282 if (len >= (pol->sadb_x_policy_len*8 +
3283 sizeof(struct sadb_x_sec_ctx))) {
3284 char *p = (char *)pol;
3285 struct xfrm_user_sec_ctx *uctx;
3286
3287 p += pol->sadb_x_policy_len*8;
3288 sec_ctx = (struct sadb_x_sec_ctx *)p;
3289 if (len < pol->sadb_x_policy_len*8 +
3290 sec_ctx->sadb_x_sec_len*8) {
3291 *dir = -EINVAL;
3292 goto out;
3293 }
3294 if ((*dir = verify_sec_ctx_len(p)))
3295 goto out;
3296 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3297 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3298 kfree(uctx);
3299
3300 if (*dir)
3301 goto out;
3302 }
3303
3304 *dir = pol->sadb_x_policy_dir-1;
3305 return xp;
3306
3307 out:
3308 xp->walk.dead = 1;
3309 xfrm_policy_destroy(xp);
3310 return NULL;
3311 }
3312
3313 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3314 {
3315 struct sk_buff *skb;
3316 struct sadb_msg *hdr;
3317 struct sadb_sa *sa;
3318 struct sadb_address *addr;
3319 struct sadb_x_nat_t_port *n_port;
3320 int sockaddr_size;
3321 int size;
3322 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3323 struct xfrm_encap_tmpl *natt = NULL;
3324
3325 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3326 if (!sockaddr_size)
3327 return -EINVAL;
3328
3329 if (!satype)
3330 return -EINVAL;
3331
3332 if (!x->encap)
3333 return -EINVAL;
3334
3335 natt = x->encap;
3336
3337 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3338 *
3339 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3340 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3341 */
3342
3343 size = sizeof(struct sadb_msg) +
3344 sizeof(struct sadb_sa) +
3345 (sizeof(struct sadb_address) * 2) +
3346 (sockaddr_size * 2) +
3347 (sizeof(struct sadb_x_nat_t_port) * 2);
3348
3349 skb = alloc_skb(size + 16, GFP_ATOMIC);
3350 if (skb == NULL)
3351 return -ENOMEM;
3352
3353 hdr = skb_put(skb, sizeof(struct sadb_msg));
3354 hdr->sadb_msg_version = PF_KEY_V2;
3355 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3356 hdr->sadb_msg_satype = satype;
3357 hdr->sadb_msg_len = size / sizeof(uint64_t);
3358 hdr->sadb_msg_errno = 0;
3359 hdr->sadb_msg_reserved = 0;
3360 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3361 hdr->sadb_msg_pid = 0;
3362
3363 /* SA */
3364 sa = skb_put(skb, sizeof(struct sadb_sa));
3365 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3366 sa->sadb_sa_exttype = SADB_EXT_SA;
3367 sa->sadb_sa_spi = x->id.spi;
3368 sa->sadb_sa_replay = 0;
3369 sa->sadb_sa_state = 0;
3370 sa->sadb_sa_auth = 0;
3371 sa->sadb_sa_encrypt = 0;
3372 sa->sadb_sa_flags = 0;
3373
3374 /* ADDRESS_SRC (old addr) */
3375 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3376 addr->sadb_address_len =
3377 (sizeof(struct sadb_address)+sockaddr_size)/
3378 sizeof(uint64_t);
3379 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3380 addr->sadb_address_proto = 0;
3381 addr->sadb_address_reserved = 0;
3382 addr->sadb_address_prefixlen =
3383 pfkey_sockaddr_fill(&x->props.saddr, 0,
3384 (struct sockaddr *) (addr + 1),
3385 x->props.family);
3386 if (!addr->sadb_address_prefixlen)
3387 BUG();
3388
3389 /* NAT_T_SPORT (old port) */
3390 n_port = skb_put(skb, sizeof(*n_port));
3391 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3392 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3393 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3394 n_port->sadb_x_nat_t_port_reserved = 0;
3395
3396 /* ADDRESS_DST (new addr) */
3397 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3398 addr->sadb_address_len =
3399 (sizeof(struct sadb_address)+sockaddr_size)/
3400 sizeof(uint64_t);
3401 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3402 addr->sadb_address_proto = 0;
3403 addr->sadb_address_reserved = 0;
3404 addr->sadb_address_prefixlen =
3405 pfkey_sockaddr_fill(ipaddr, 0,
3406 (struct sockaddr *) (addr + 1),
3407 x->props.family);
3408 if (!addr->sadb_address_prefixlen)
3409 BUG();
3410
3411 /* NAT_T_DPORT (new port) */
3412 n_port = skb_put(skb, sizeof(*n_port));
3413 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3414 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3415 n_port->sadb_x_nat_t_port_port = sport;
3416 n_port->sadb_x_nat_t_port_reserved = 0;
3417
3418 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3419 xs_net(x));
3420 }
3421
3422 #ifdef CONFIG_NET_KEY_MIGRATE
3423 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3424 const struct xfrm_selector *sel)
3425 {
3426 struct sadb_address *addr;
3427 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3428 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3429 addr->sadb_address_exttype = type;
3430 addr->sadb_address_proto = sel->proto;
3431 addr->sadb_address_reserved = 0;
3432
3433 switch (type) {
3434 case SADB_EXT_ADDRESS_SRC:
3435 addr->sadb_address_prefixlen = sel->prefixlen_s;
3436 pfkey_sockaddr_fill(&sel->saddr, 0,
3437 (struct sockaddr *)(addr + 1),
3438 sel->family);
3439 break;
3440 case SADB_EXT_ADDRESS_DST:
3441 addr->sadb_address_prefixlen = sel->prefixlen_d;
3442 pfkey_sockaddr_fill(&sel->daddr, 0,
3443 (struct sockaddr *)(addr + 1),
3444 sel->family);
3445 break;
3446 default:
3447 return -EINVAL;
3448 }
3449
3450 return 0;
3451 }
3452
3453
3454 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3455 {
3456 struct sadb_x_kmaddress *kma;
3457 u8 *sa;
3458 int family = k->family;
3459 int socklen = pfkey_sockaddr_len(family);
3460 int size_req;
3461
3462 size_req = (sizeof(struct sadb_x_kmaddress) +
3463 pfkey_sockaddr_pair_size(family));
3464
3465 kma = skb_put_zero(skb, size_req);
3466 kma->sadb_x_kmaddress_len = size_req / 8;
3467 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3468 kma->sadb_x_kmaddress_reserved = k->reserved;
3469
3470 sa = (u8 *)(kma + 1);
3471 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3472 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3473 return -EINVAL;
3474
3475 return 0;
3476 }
3477
3478 static int set_ipsecrequest(struct sk_buff *skb,
3479 uint8_t proto, uint8_t mode, int level,
3480 uint32_t reqid, uint8_t family,
3481 const xfrm_address_t *src, const xfrm_address_t *dst)
3482 {
3483 struct sadb_x_ipsecrequest *rq;
3484 u8 *sa;
3485 int socklen = pfkey_sockaddr_len(family);
3486 int size_req;
3487
3488 size_req = sizeof(struct sadb_x_ipsecrequest) +
3489 pfkey_sockaddr_pair_size(family);
3490
3491 rq = skb_put_zero(skb, size_req);
3492 rq->sadb_x_ipsecrequest_len = size_req;
3493 rq->sadb_x_ipsecrequest_proto = proto;
3494 rq->sadb_x_ipsecrequest_mode = mode;
3495 rq->sadb_x_ipsecrequest_level = level;
3496 rq->sadb_x_ipsecrequest_reqid = reqid;
3497
3498 sa = (u8 *) (rq + 1);
3499 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3500 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3501 return -EINVAL;
3502
3503 return 0;
3504 }
3505 #endif
3506
3507 #ifdef CONFIG_NET_KEY_MIGRATE
3508 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3509 const struct xfrm_migrate *m, int num_bundles,
3510 const struct xfrm_kmaddress *k,
3511 const struct xfrm_encap_tmpl *encap)
3512 {
3513 int i;
3514 int sasize_sel;
3515 int size = 0;
3516 int size_pol = 0;
3517 struct sk_buff *skb;
3518 struct sadb_msg *hdr;
3519 struct sadb_x_policy *pol;
3520 const struct xfrm_migrate *mp;
3521
3522 if (type != XFRM_POLICY_TYPE_MAIN)
3523 return 0;
3524
3525 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3526 return -EINVAL;
3527
3528 if (k != NULL) {
3529 /* addresses for KM */
3530 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3531 pfkey_sockaddr_pair_size(k->family));
3532 }
3533
3534 /* selector */
3535 sasize_sel = pfkey_sockaddr_size(sel->family);
3536 if (!sasize_sel)
3537 return -EINVAL;
3538 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3539
3540 /* policy info */
3541 size_pol += sizeof(struct sadb_x_policy);
3542
3543 /* ipsecrequests */
3544 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3545 /* old locator pair */
3546 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3547 pfkey_sockaddr_pair_size(mp->old_family);
3548 /* new locator pair */
3549 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3550 pfkey_sockaddr_pair_size(mp->new_family);
3551 }
3552
3553 size += sizeof(struct sadb_msg) + size_pol;
3554
3555 /* alloc buffer */
3556 skb = alloc_skb(size, GFP_ATOMIC);
3557 if (skb == NULL)
3558 return -ENOMEM;
3559
3560 hdr = skb_put(skb, sizeof(struct sadb_msg));
3561 hdr->sadb_msg_version = PF_KEY_V2;
3562 hdr->sadb_msg_type = SADB_X_MIGRATE;
3563 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3564 hdr->sadb_msg_len = size / 8;
3565 hdr->sadb_msg_errno = 0;
3566 hdr->sadb_msg_reserved = 0;
3567 hdr->sadb_msg_seq = 0;
3568 hdr->sadb_msg_pid = 0;
3569
3570 /* Addresses to be used by KM for negotiation, if ext is available */
3571 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3572 goto err;
3573
3574 /* selector src */
3575 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3576
3577 /* selector dst */
3578 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3579
3580 /* policy information */
3581 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3582 pol->sadb_x_policy_len = size_pol / 8;
3583 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3584 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3585 pol->sadb_x_policy_dir = dir + 1;
3586 pol->sadb_x_policy_reserved = 0;
3587 pol->sadb_x_policy_id = 0;
3588 pol->sadb_x_policy_priority = 0;
3589
3590 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3591 /* old ipsecrequest */
3592 int mode = pfkey_mode_from_xfrm(mp->mode);
3593 if (mode < 0)
3594 goto err;
3595 if (set_ipsecrequest(skb, mp->proto, mode,
3596 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3597 mp->reqid, mp->old_family,
3598 &mp->old_saddr, &mp->old_daddr) < 0)
3599 goto err;
3600
3601 /* new ipsecrequest */
3602 if (set_ipsecrequest(skb, mp->proto, mode,
3603 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3604 mp->reqid, mp->new_family,
3605 &mp->new_saddr, &mp->new_daddr) < 0)
3606 goto err;
3607 }
3608
3609 /* broadcast migrate message to sockets */
3610 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3611
3612 return 0;
3613
3614 err:
3615 kfree_skb(skb);
3616 return -EINVAL;
3617 }
3618 #else
3619 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3620 const struct xfrm_migrate *m, int num_bundles,
3621 const struct xfrm_kmaddress *k,
3622 const struct xfrm_encap_tmpl *encap)
3623 {
3624 return -ENOPROTOOPT;
3625 }
3626 #endif
3627
3628 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3629 {
3630 struct sock *sk = sock->sk;
3631 struct sk_buff *skb = NULL;
3632 struct sadb_msg *hdr = NULL;
3633 int err;
3634 struct net *net = sock_net(sk);
3635
3636 err = -EOPNOTSUPP;
3637 if (msg->msg_flags & MSG_OOB)
3638 goto out;
3639
3640 err = -EMSGSIZE;
3641 if ((unsigned int)len > sk->sk_sndbuf - 32)
3642 goto out;
3643
3644 err = -ENOBUFS;
3645 skb = alloc_skb(len, GFP_KERNEL);
3646 if (skb == NULL)
3647 goto out;
3648
3649 err = -EFAULT;
3650 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3651 goto out;
3652
3653 hdr = pfkey_get_base_msg(skb, &err);
3654 if (!hdr)
3655 goto out;
3656
3657 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3658 err = pfkey_process(sk, skb, hdr);
3659 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3660
3661 out:
3662 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3663 err = 0;
3664 kfree_skb(skb);
3665
3666 return err ? : len;
3667 }
3668
3669 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3670 int flags)
3671 {
3672 struct sock *sk = sock->sk;
3673 struct pfkey_sock *pfk = pfkey_sk(sk);
3674 struct sk_buff *skb;
3675 int copied, err;
3676
3677 err = -EINVAL;
3678 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3679 goto out;
3680
3681 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3682 if (skb == NULL)
3683 goto out;
3684
3685 copied = skb->len;
3686 if (copied > len) {
3687 msg->msg_flags |= MSG_TRUNC;
3688 copied = len;
3689 }
3690
3691 skb_reset_transport_header(skb);
3692 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3693 if (err)
3694 goto out_free;
3695
3696 sock_recv_ts_and_drops(msg, sk, skb);
3697
3698 err = (flags & MSG_TRUNC) ? skb->len : copied;
3699
3700 if (pfk->dump.dump != NULL &&
3701 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3702 pfkey_do_dump(pfk);
3703
3704 out_free:
3705 skb_free_datagram(sk, skb);
3706 out:
3707 return err;
3708 }
3709
3710 static const struct proto_ops pfkey_ops = {
3711 .family = PF_KEY,
3712 .owner = THIS_MODULE,
3713 /* Operations that make no sense on pfkey sockets. */
3714 .bind = sock_no_bind,
3715 .connect = sock_no_connect,
3716 .socketpair = sock_no_socketpair,
3717 .accept = sock_no_accept,
3718 .getname = sock_no_getname,
3719 .ioctl = sock_no_ioctl,
3720 .listen = sock_no_listen,
3721 .shutdown = sock_no_shutdown,
3722 .setsockopt = sock_no_setsockopt,
3723 .getsockopt = sock_no_getsockopt,
3724 .mmap = sock_no_mmap,
3725 .sendpage = sock_no_sendpage,
3726
3727 /* Now the operations that really occur. */
3728 .release = pfkey_release,
3729 .poll = datagram_poll,
3730 .sendmsg = pfkey_sendmsg,
3731 .recvmsg = pfkey_recvmsg,
3732 };
3733
3734 static const struct net_proto_family pfkey_family_ops = {
3735 .family = PF_KEY,
3736 .create = pfkey_create,
3737 .owner = THIS_MODULE,
3738 };
3739
3740 #ifdef CONFIG_PROC_FS
3741 static int pfkey_seq_show(struct seq_file *f, void *v)
3742 {
3743 struct sock *s = sk_entry(v);
3744
3745 if (v == SEQ_START_TOKEN)
3746 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3747 else
3748 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3749 s,
3750 refcount_read(&s->sk_refcnt),
3751 sk_rmem_alloc_get(s),
3752 sk_wmem_alloc_get(s),
3753 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3754 sock_i_ino(s)
3755 );
3756 return 0;
3757 }
3758
3759 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3760 __acquires(rcu)
3761 {
3762 struct net *net = seq_file_net(f);
3763 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3764
3765 rcu_read_lock();
3766 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3767 }
3768
3769 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3770 {
3771 struct net *net = seq_file_net(f);
3772 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3773
3774 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3775 }
3776
3777 static void pfkey_seq_stop(struct seq_file *f, void *v)
3778 __releases(rcu)
3779 {
3780 rcu_read_unlock();
3781 }
3782
3783 static const struct seq_operations pfkey_seq_ops = {
3784 .start = pfkey_seq_start,
3785 .next = pfkey_seq_next,
3786 .stop = pfkey_seq_stop,
3787 .show = pfkey_seq_show,
3788 };
3789
3790 static int pfkey_seq_open(struct inode *inode, struct file *file)
3791 {
3792 return seq_open_net(inode, file, &pfkey_seq_ops,
3793 sizeof(struct seq_net_private));
3794 }
3795
3796 static const struct file_operations pfkey_proc_ops = {
3797 .open = pfkey_seq_open,
3798 .read = seq_read,
3799 .llseek = seq_lseek,
3800 .release = seq_release_net,
3801 };
3802
3803 static int __net_init pfkey_init_proc(struct net *net)
3804 {
3805 struct proc_dir_entry *e;
3806
3807 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3808 if (e == NULL)
3809 return -ENOMEM;
3810
3811 return 0;
3812 }
3813
3814 static void __net_exit pfkey_exit_proc(struct net *net)
3815 {
3816 remove_proc_entry("pfkey", net->proc_net);
3817 }
3818 #else
3819 static inline int pfkey_init_proc(struct net *net)
3820 {
3821 return 0;
3822 }
3823
3824 static inline void pfkey_exit_proc(struct net *net)
3825 {
3826 }
3827 #endif
3828
3829 static struct xfrm_mgr pfkeyv2_mgr =
3830 {
3831 .notify = pfkey_send_notify,
3832 .acquire = pfkey_send_acquire,
3833 .compile_policy = pfkey_compile_policy,
3834 .new_mapping = pfkey_send_new_mapping,
3835 .notify_policy = pfkey_send_policy_notify,
3836 .migrate = pfkey_send_migrate,
3837 .is_alive = pfkey_is_alive,
3838 };
3839
3840 static int __net_init pfkey_net_init(struct net *net)
3841 {
3842 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3843 int rv;
3844
3845 INIT_HLIST_HEAD(&net_pfkey->table);
3846 atomic_set(&net_pfkey->socks_nr, 0);
3847
3848 rv = pfkey_init_proc(net);
3849
3850 return rv;
3851 }
3852
3853 static void __net_exit pfkey_net_exit(struct net *net)
3854 {
3855 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3856
3857 pfkey_exit_proc(net);
3858 WARN_ON(!hlist_empty(&net_pfkey->table));
3859 }
3860
3861 static struct pernet_operations pfkey_net_ops = {
3862 .init = pfkey_net_init,
3863 .exit = pfkey_net_exit,
3864 .id = &pfkey_net_id,
3865 .size = sizeof(struct netns_pfkey),
3866 };
3867
3868 static void __exit ipsec_pfkey_exit(void)
3869 {
3870 xfrm_unregister_km(&pfkeyv2_mgr);
3871 sock_unregister(PF_KEY);
3872 unregister_pernet_subsys(&pfkey_net_ops);
3873 proto_unregister(&key_proto);
3874 }
3875
3876 static int __init ipsec_pfkey_init(void)
3877 {
3878 int err = proto_register(&key_proto, 0);
3879
3880 if (err != 0)
3881 goto out;
3882
3883 err = register_pernet_subsys(&pfkey_net_ops);
3884 if (err != 0)
3885 goto out_unregister_key_proto;
3886 err = sock_register(&pfkey_family_ops);
3887 if (err != 0)
3888 goto out_unregister_pernet;
3889 err = xfrm_register_km(&pfkeyv2_mgr);
3890 if (err != 0)
3891 goto out_sock_unregister;
3892 out:
3893 return err;
3894
3895 out_sock_unregister:
3896 sock_unregister(PF_KEY);
3897 out_unregister_pernet:
3898 unregister_pernet_subsys(&pfkey_net_ops);
3899 out_unregister_key_proto:
3900 proto_unregister(&key_proto);
3901 goto out;
3902 }
3903
3904 module_init(ipsec_pfkey_init);
3905 module_exit(ipsec_pfkey_exit);
3906 MODULE_LICENSE("GPL");
3907 MODULE_ALIAS_NETPROTO(PF_KEY);
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