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