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ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks
[linux/fpc-iii.git] / net / key / af_key.c
blob3ba903ff2bb083531e93a95d8cfebf43a32a4259
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 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(atomic_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 (atomic_read(&skb->users) != 1) {
207 *skb2 = skb_clone(skb, allocation);
208 } else {
209 *skb2 = skb;
210 atomic_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 = (struct sadb_msg *) 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 sadb_key_len(const struct sadb_key *key)
441 {
442 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
443
444 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
445 sizeof(uint64_t));
446 }
447
448 static int verify_key_len(const void *p)
449 {
450 const struct sadb_key *key = p;
451
452 if (sadb_key_len(key) > key->sadb_key_len)
453 return -EINVAL;
454
455 return 0;
456 }
457
458 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
459 {
460 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
461 sec_ctx->sadb_x_ctx_len,
462 sizeof(uint64_t));
463 }
464
465 static inline int verify_sec_ctx_len(const void *p)
466 {
467 const struct sadb_x_sec_ctx *sec_ctx = p;
468 int len = sec_ctx->sadb_x_ctx_len;
469
470 if (len > PAGE_SIZE)
471 return -EINVAL;
472
473 len = pfkey_sec_ctx_len(sec_ctx);
474
475 if (sec_ctx->sadb_x_sec_len != len)
476 return -EINVAL;
477
478 return 0;
479 }
480
481 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
482 gfp_t gfp)
483 {
484 struct xfrm_user_sec_ctx *uctx = NULL;
485 int ctx_size = sec_ctx->sadb_x_ctx_len;
486
487 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
488
489 if (!uctx)
490 return NULL;
491
492 uctx->len = pfkey_sec_ctx_len(sec_ctx);
493 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
494 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
495 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
496 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
497 memcpy(uctx + 1, sec_ctx + 1,
498 uctx->ctx_len);
499
500 return uctx;
501 }
502
503 static int present_and_same_family(const struct sadb_address *src,
504 const struct sadb_address *dst)
505 {
506 const struct sockaddr *s_addr, *d_addr;
507
508 if (!src || !dst)
509 return 0;
510
511 s_addr = (const struct sockaddr *)(src + 1);
512 d_addr = (const struct sockaddr *)(dst + 1);
513 if (s_addr->sa_family != d_addr->sa_family)
514 return 0;
515 if (s_addr->sa_family != AF_INET
516 #if IS_ENABLED(CONFIG_IPV6)
517 && s_addr->sa_family != AF_INET6
518 #endif
519 )
520 return 0;
521
522 return 1;
523 }
524
525 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
526 {
527 const char *p = (char *) hdr;
528 int len = skb->len;
529
530 len -= sizeof(*hdr);
531 p += sizeof(*hdr);
532 while (len > 0) {
533 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
534 uint16_t ext_type;
535 int ext_len;
536
537 if (len < sizeof(*ehdr))
538 return -EINVAL;
539
540 ext_len = ehdr->sadb_ext_len;
541 ext_len *= sizeof(uint64_t);
542 ext_type = ehdr->sadb_ext_type;
543 if (ext_len < sizeof(uint64_t) ||
544 ext_len > len ||
545 ext_type == SADB_EXT_RESERVED)
546 return -EINVAL;
547
548 if (ext_type <= SADB_EXT_MAX) {
549 int min = (int) sadb_ext_min_len[ext_type];
550 if (ext_len < min)
551 return -EINVAL;
552 if (ext_hdrs[ext_type-1] != NULL)
553 return -EINVAL;
554 switch (ext_type) {
555 case SADB_EXT_ADDRESS_SRC:
556 case SADB_EXT_ADDRESS_DST:
557 case SADB_EXT_ADDRESS_PROXY:
558 case SADB_X_EXT_NAT_T_OA:
559 if (verify_address_len(p))
560 return -EINVAL;
561 break;
562 case SADB_X_EXT_SEC_CTX:
563 if (verify_sec_ctx_len(p))
564 return -EINVAL;
565 break;
566 case SADB_EXT_KEY_AUTH:
567 case SADB_EXT_KEY_ENCRYPT:
568 if (verify_key_len(p))
569 return -EINVAL;
570 break;
571 default:
572 break;
573 }
574 ext_hdrs[ext_type-1] = (void *) p;
575 }
576 p += ext_len;
577 len -= ext_len;
578 }
579
580 return 0;
581 }
582
583 static uint16_t
584 pfkey_satype2proto(uint8_t satype)
585 {
586 switch (satype) {
587 case SADB_SATYPE_UNSPEC:
588 return IPSEC_PROTO_ANY;
589 case SADB_SATYPE_AH:
590 return IPPROTO_AH;
591 case SADB_SATYPE_ESP:
592 return IPPROTO_ESP;
593 case SADB_X_SATYPE_IPCOMP:
594 return IPPROTO_COMP;
595 default:
596 return 0;
597 }
598 /* NOTREACHED */
599 }
600
601 static uint8_t
602 pfkey_proto2satype(uint16_t proto)
603 {
604 switch (proto) {
605 case IPPROTO_AH:
606 return SADB_SATYPE_AH;
607 case IPPROTO_ESP:
608 return SADB_SATYPE_ESP;
609 case IPPROTO_COMP:
610 return SADB_X_SATYPE_IPCOMP;
611 default:
612 return 0;
613 }
614 /* NOTREACHED */
615 }
616
617 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
618 * say specifically 'just raw sockets' as we encode them as 255.
619 */
620
621 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
622 {
623 return proto == IPSEC_PROTO_ANY ? 0 : proto;
624 }
625
626 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
627 {
628 return proto ? proto : IPSEC_PROTO_ANY;
629 }
630
631 static inline int pfkey_sockaddr_len(sa_family_t family)
632 {
633 switch (family) {
634 case AF_INET:
635 return sizeof(struct sockaddr_in);
636 #if IS_ENABLED(CONFIG_IPV6)
637 case AF_INET6:
638 return sizeof(struct sockaddr_in6);
639 #endif
640 }
641 return 0;
642 }
643
644 static
645 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
646 {
647 switch (sa->sa_family) {
648 case AF_INET:
649 xaddr->a4 =
650 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
651 return AF_INET;
652 #if IS_ENABLED(CONFIG_IPV6)
653 case AF_INET6:
654 memcpy(xaddr->a6,
655 &((struct sockaddr_in6 *)sa)->sin6_addr,
656 sizeof(struct in6_addr));
657 return AF_INET6;
658 #endif
659 }
660 return 0;
661 }
662
663 static
664 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
665 {
666 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
667 xaddr);
668 }
669
670 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
671 {
672 const struct sadb_sa *sa;
673 const struct sadb_address *addr;
674 uint16_t proto;
675 unsigned short family;
676 xfrm_address_t *xaddr;
677
678 sa = ext_hdrs[SADB_EXT_SA - 1];
679 if (sa == NULL)
680 return NULL;
681
682 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
683 if (proto == 0)
684 return NULL;
685
686 /* sadb_address_len should be checked by caller */
687 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
688 if (addr == NULL)
689 return NULL;
690
691 family = ((const struct sockaddr *)(addr + 1))->sa_family;
692 switch (family) {
693 case AF_INET:
694 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
695 break;
696 #if IS_ENABLED(CONFIG_IPV6)
697 case AF_INET6:
698 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
699 break;
700 #endif
701 default:
702 xaddr = NULL;
703 }
704
705 if (!xaddr)
706 return NULL;
707
708 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
709 }
710
711 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
712
713 static int
714 pfkey_sockaddr_size(sa_family_t family)
715 {
716 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
717 }
718
719 static inline int pfkey_mode_from_xfrm(int mode)
720 {
721 switch(mode) {
722 case XFRM_MODE_TRANSPORT:
723 return IPSEC_MODE_TRANSPORT;
724 case XFRM_MODE_TUNNEL:
725 return IPSEC_MODE_TUNNEL;
726 case XFRM_MODE_BEET:
727 return IPSEC_MODE_BEET;
728 default:
729 return -1;
730 }
731 }
732
733 static inline int pfkey_mode_to_xfrm(int mode)
734 {
735 switch(mode) {
736 case IPSEC_MODE_ANY: /*XXX*/
737 case IPSEC_MODE_TRANSPORT:
738 return XFRM_MODE_TRANSPORT;
739 case IPSEC_MODE_TUNNEL:
740 return XFRM_MODE_TUNNEL;
741 case IPSEC_MODE_BEET:
742 return XFRM_MODE_BEET;
743 default:
744 return -1;
745 }
746 }
747
748 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
749 struct sockaddr *sa,
750 unsigned short family)
751 {
752 switch (family) {
753 case AF_INET:
754 {
755 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
756 sin->sin_family = AF_INET;
757 sin->sin_port = port;
758 sin->sin_addr.s_addr = xaddr->a4;
759 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
760 return 32;
761 }
762 #if IS_ENABLED(CONFIG_IPV6)
763 case AF_INET6:
764 {
765 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
766 sin6->sin6_family = AF_INET6;
767 sin6->sin6_port = port;
768 sin6->sin6_flowinfo = 0;
769 sin6->sin6_addr = xaddr->in6;
770 sin6->sin6_scope_id = 0;
771 return 128;
772 }
773 #endif
774 }
775 return 0;
776 }
777
778 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
779 int add_keys, int hsc)
780 {
781 struct sk_buff *skb;
782 struct sadb_msg *hdr;
783 struct sadb_sa *sa;
784 struct sadb_lifetime *lifetime;
785 struct sadb_address *addr;
786 struct sadb_key *key;
787 struct sadb_x_sa2 *sa2;
788 struct sadb_x_sec_ctx *sec_ctx;
789 struct xfrm_sec_ctx *xfrm_ctx;
790 int ctx_size = 0;
791 int size;
792 int auth_key_size = 0;
793 int encrypt_key_size = 0;
794 int sockaddr_size;
795 struct xfrm_encap_tmpl *natt = NULL;
796 int mode;
797
798 /* address family check */
799 sockaddr_size = pfkey_sockaddr_size(x->props.family);
800 if (!sockaddr_size)
801 return ERR_PTR(-EINVAL);
802
803 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
804 key(AE), (identity(SD),) (sensitivity)> */
805 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
806 sizeof(struct sadb_lifetime) +
807 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
808 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
809 sizeof(struct sadb_address)*2 +
810 sockaddr_size*2 +
811 sizeof(struct sadb_x_sa2);
812
813 if ((xfrm_ctx = x->security)) {
814 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
815 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
816 }
817
818 /* identity & sensitivity */
819 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
820 size += sizeof(struct sadb_address) + sockaddr_size;
821
822 if (add_keys) {
823 if (x->aalg && x->aalg->alg_key_len) {
824 auth_key_size =
825 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
826 size += sizeof(struct sadb_key) + auth_key_size;
827 }
828 if (x->ealg && x->ealg->alg_key_len) {
829 encrypt_key_size =
830 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
831 size += sizeof(struct sadb_key) + encrypt_key_size;
832 }
833 }
834 if (x->encap)
835 natt = x->encap;
836
837 if (natt && natt->encap_type) {
838 size += sizeof(struct sadb_x_nat_t_type);
839 size += sizeof(struct sadb_x_nat_t_port);
840 size += sizeof(struct sadb_x_nat_t_port);
841 }
842
843 skb = alloc_skb(size + 16, GFP_ATOMIC);
844 if (skb == NULL)
845 return ERR_PTR(-ENOBUFS);
846
847 /* call should fill header later */
848 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
849 memset(hdr, 0, size); /* XXX do we need this ? */
850 hdr->sadb_msg_len = size / sizeof(uint64_t);
851
852 /* sa */
853 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
854 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
855 sa->sadb_sa_exttype = SADB_EXT_SA;
856 sa->sadb_sa_spi = x->id.spi;
857 sa->sadb_sa_replay = x->props.replay_window;
858 switch (x->km.state) {
859 case XFRM_STATE_VALID:
860 sa->sadb_sa_state = x->km.dying ?
861 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
862 break;
863 case XFRM_STATE_ACQ:
864 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
865 break;
866 default:
867 sa->sadb_sa_state = SADB_SASTATE_DEAD;
868 break;
869 }
870 sa->sadb_sa_auth = 0;
871 if (x->aalg) {
872 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
873 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
874 a->desc.sadb_alg_id : 0;
875 }
876 sa->sadb_sa_encrypt = 0;
877 BUG_ON(x->ealg && x->calg);
878 if (x->ealg) {
879 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
880 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
881 a->desc.sadb_alg_id : 0;
882 }
883 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
884 if (x->calg) {
885 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
886 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
887 a->desc.sadb_alg_id : 0;
888 }
889
890 sa->sadb_sa_flags = 0;
891 if (x->props.flags & XFRM_STATE_NOECN)
892 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
893 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
894 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
895 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
896 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
897
898 /* hard time */
899 if (hsc & 2) {
900 lifetime = (struct sadb_lifetime *) skb_put(skb,
901 sizeof(struct sadb_lifetime));
902 lifetime->sadb_lifetime_len =
903 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
904 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
905 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
906 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
907 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
908 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
909 }
910 /* soft time */
911 if (hsc & 1) {
912 lifetime = (struct sadb_lifetime *) skb_put(skb,
913 sizeof(struct sadb_lifetime));
914 lifetime->sadb_lifetime_len =
915 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
916 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
917 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
918 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
919 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
920 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
921 }
922 /* current time */
923 lifetime = (struct sadb_lifetime *) skb_put(skb,
924 sizeof(struct sadb_lifetime));
925 lifetime->sadb_lifetime_len =
926 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
927 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
928 lifetime->sadb_lifetime_allocations = x->curlft.packets;
929 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
930 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
931 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
932 /* src address */
933 addr = (struct sadb_address*) skb_put(skb,
934 sizeof(struct sadb_address)+sockaddr_size);
935 addr->sadb_address_len =
936 (sizeof(struct sadb_address)+sockaddr_size)/
937 sizeof(uint64_t);
938 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
939 /* "if the ports are non-zero, then the sadb_address_proto field,
940 normally zero, MUST be filled in with the transport
941 protocol's number." - RFC2367 */
942 addr->sadb_address_proto = 0;
943 addr->sadb_address_reserved = 0;
944
945 addr->sadb_address_prefixlen =
946 pfkey_sockaddr_fill(&x->props.saddr, 0,
947 (struct sockaddr *) (addr + 1),
948 x->props.family);
949 if (!addr->sadb_address_prefixlen)
950 BUG();
951
952 /* dst address */
953 addr = (struct sadb_address*) skb_put(skb,
954 sizeof(struct sadb_address)+sockaddr_size);
955 addr->sadb_address_len =
956 (sizeof(struct sadb_address)+sockaddr_size)/
957 sizeof(uint64_t);
958 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
959 addr->sadb_address_proto = 0;
960 addr->sadb_address_reserved = 0;
961
962 addr->sadb_address_prefixlen =
963 pfkey_sockaddr_fill(&x->id.daddr, 0,
964 (struct sockaddr *) (addr + 1),
965 x->props.family);
966 if (!addr->sadb_address_prefixlen)
967 BUG();
968
969 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
970 x->props.family)) {
971 addr = (struct sadb_address*) skb_put(skb,
972 sizeof(struct sadb_address)+sockaddr_size);
973 addr->sadb_address_len =
974 (sizeof(struct sadb_address)+sockaddr_size)/
975 sizeof(uint64_t);
976 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
977 addr->sadb_address_proto =
978 pfkey_proto_from_xfrm(x->sel.proto);
979 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
980 addr->sadb_address_reserved = 0;
981
982 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
983 (struct sockaddr *) (addr + 1),
984 x->props.family);
985 }
986
987 /* auth key */
988 if (add_keys && auth_key_size) {
989 key = (struct sadb_key *) skb_put(skb,
990 sizeof(struct sadb_key)+auth_key_size);
991 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
992 sizeof(uint64_t);
993 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
994 key->sadb_key_bits = x->aalg->alg_key_len;
995 key->sadb_key_reserved = 0;
996 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
997 }
998 /* encrypt key */
999 if (add_keys && encrypt_key_size) {
1000 key = (struct sadb_key *) skb_put(skb,
1001 sizeof(struct sadb_key)+encrypt_key_size);
1002 key->sadb_key_len = (sizeof(struct sadb_key) +
1003 encrypt_key_size) / sizeof(uint64_t);
1004 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1005 key->sadb_key_bits = x->ealg->alg_key_len;
1006 key->sadb_key_reserved = 0;
1007 memcpy(key + 1, x->ealg->alg_key,
1008 (x->ealg->alg_key_len+7)/8);
1009 }
1010
1011 /* sa */
1012 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
1013 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1014 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1015 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1016 kfree_skb(skb);
1017 return ERR_PTR(-EINVAL);
1018 }
1019 sa2->sadb_x_sa2_mode = mode;
1020 sa2->sadb_x_sa2_reserved1 = 0;
1021 sa2->sadb_x_sa2_reserved2 = 0;
1022 sa2->sadb_x_sa2_sequence = 0;
1023 sa2->sadb_x_sa2_reqid = x->props.reqid;
1024
1025 if (natt && natt->encap_type) {
1026 struct sadb_x_nat_t_type *n_type;
1027 struct sadb_x_nat_t_port *n_port;
1028
1029 /* type */
1030 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1031 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1032 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1033 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1034 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1035 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1036 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1037
1038 /* source port */
1039 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1040 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1041 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1042 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1043 n_port->sadb_x_nat_t_port_reserved = 0;
1044
1045 /* dest port */
1046 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1047 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1048 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1049 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1050 n_port->sadb_x_nat_t_port_reserved = 0;
1051 }
1052
1053 /* security context */
1054 if (xfrm_ctx) {
1055 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1056 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1057 sec_ctx->sadb_x_sec_len =
1058 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1059 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1060 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1061 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1062 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1063 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1064 xfrm_ctx->ctx_len);
1065 }
1066
1067 return skb;
1068 }
1069
1070
1071 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1072 {
1073 struct sk_buff *skb;
1074
1075 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1076
1077 return skb;
1078 }
1079
1080 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1081 int hsc)
1082 {
1083 return __pfkey_xfrm_state2msg(x, 0, hsc);
1084 }
1085
1086 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1087 const struct sadb_msg *hdr,
1088 void * const *ext_hdrs)
1089 {
1090 struct xfrm_state *x;
1091 const struct sadb_lifetime *lifetime;
1092 const struct sadb_sa *sa;
1093 const struct sadb_key *key;
1094 const struct sadb_x_sec_ctx *sec_ctx;
1095 uint16_t proto;
1096 int err;
1097
1098
1099 sa = ext_hdrs[SADB_EXT_SA - 1];
1100 if (!sa ||
1101 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1102 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1103 return ERR_PTR(-EINVAL);
1104 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1105 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1106 return ERR_PTR(-EINVAL);
1107 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1108 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1109 return ERR_PTR(-EINVAL);
1110 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1111 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1112 return ERR_PTR(-EINVAL);
1113
1114 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1115 if (proto == 0)
1116 return ERR_PTR(-EINVAL);
1117
1118 /* default error is no buffer space */
1119 err = -ENOBUFS;
1120
1121 /* RFC2367:
1122
1123 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1124 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1125 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1126 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1127 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1128 not true.
1129
1130 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1131 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1132 */
1133 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1134 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1135 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1136 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1137 return ERR_PTR(-EINVAL);
1138 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139 if (key != NULL &&
1140 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1141 key->sadb_key_bits == 0)
1142 return ERR_PTR(-EINVAL);
1143 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1144 if (key != NULL &&
1145 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1146 key->sadb_key_bits == 0)
1147 return ERR_PTR(-EINVAL);
1148
1149 x = xfrm_state_alloc(net);
1150 if (x == NULL)
1151 return ERR_PTR(-ENOBUFS);
1152
1153 x->id.proto = proto;
1154 x->id.spi = sa->sadb_sa_spi;
1155 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1156 (sizeof(x->replay.bitmap) * 8));
1157 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1158 x->props.flags |= XFRM_STATE_NOECN;
1159 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1160 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1161 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1162 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1163
1164 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1165 if (lifetime != NULL) {
1166 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1167 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1168 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1169 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1170 }
1171 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1172 if (lifetime != NULL) {
1173 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1174 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1175 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1176 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1177 }
1178
1179 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1180 if (sec_ctx != NULL) {
1181 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1182
1183 if (!uctx)
1184 goto out;
1185
1186 err = security_xfrm_state_alloc(x, uctx);
1187 kfree(uctx);
1188
1189 if (err)
1190 goto out;
1191 }
1192
1193 err = -ENOBUFS;
1194 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1195 if (sa->sadb_sa_auth) {
1196 int keysize = 0;
1197 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1198 if (!a || !a->pfkey_supported) {
1199 err = -ENOSYS;
1200 goto out;
1201 }
1202 if (key)
1203 keysize = (key->sadb_key_bits + 7) / 8;
1204 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1205 if (!x->aalg) {
1206 err = -ENOMEM;
1207 goto out;
1208 }
1209 strcpy(x->aalg->alg_name, a->name);
1210 x->aalg->alg_key_len = 0;
1211 if (key) {
1212 x->aalg->alg_key_len = key->sadb_key_bits;
1213 memcpy(x->aalg->alg_key, key+1, keysize);
1214 }
1215 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1216 x->props.aalgo = sa->sadb_sa_auth;
1217 /* x->algo.flags = sa->sadb_sa_flags; */
1218 }
1219 if (sa->sadb_sa_encrypt) {
1220 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1221 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1222 if (!a || !a->pfkey_supported) {
1223 err = -ENOSYS;
1224 goto out;
1225 }
1226 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1227 if (!x->calg) {
1228 err = -ENOMEM;
1229 goto out;
1230 }
1231 strcpy(x->calg->alg_name, a->name);
1232 x->props.calgo = sa->sadb_sa_encrypt;
1233 } else {
1234 int keysize = 0;
1235 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1236 if (!a || !a->pfkey_supported) {
1237 err = -ENOSYS;
1238 goto out;
1239 }
1240 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1241 if (key)
1242 keysize = (key->sadb_key_bits + 7) / 8;
1243 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1244 if (!x->ealg) {
1245 err = -ENOMEM;
1246 goto out;
1247 }
1248 strcpy(x->ealg->alg_name, a->name);
1249 x->ealg->alg_key_len = 0;
1250 if (key) {
1251 x->ealg->alg_key_len = key->sadb_key_bits;
1252 memcpy(x->ealg->alg_key, key+1, keysize);
1253 }
1254 x->props.ealgo = sa->sadb_sa_encrypt;
1255 x->geniv = a->uinfo.encr.geniv;
1256 }
1257 }
1258 /* x->algo.flags = sa->sadb_sa_flags; */
1259
1260 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1261 &x->props.saddr);
1262 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1263 &x->id.daddr);
1264
1265 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1266 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1267 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1268 if (mode < 0) {
1269 err = -EINVAL;
1270 goto out;
1271 }
1272 x->props.mode = mode;
1273 x->props.reqid = sa2->sadb_x_sa2_reqid;
1274 }
1275
1276 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1277 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1278
1279 /* Nobody uses this, but we try. */
1280 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1281 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1282 }
1283
1284 if (!x->sel.family)
1285 x->sel.family = x->props.family;
1286
1287 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1288 const struct sadb_x_nat_t_type* n_type;
1289 struct xfrm_encap_tmpl *natt;
1290
1291 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1292 if (!x->encap) {
1293 err = -ENOMEM;
1294 goto out;
1295 }
1296
1297 natt = x->encap;
1298 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1299 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1300
1301 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1302 const struct sadb_x_nat_t_port *n_port =
1303 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1304 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1305 }
1306 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1307 const struct sadb_x_nat_t_port *n_port =
1308 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1309 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1310 }
1311 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1312 }
1313
1314 err = xfrm_init_state(x);
1315 if (err)
1316 goto out;
1317
1318 x->km.seq = hdr->sadb_msg_seq;
1319 return x;
1320
1321 out:
1322 x->km.state = XFRM_STATE_DEAD;
1323 xfrm_state_put(x);
1324 return ERR_PTR(err);
1325 }
1326
1327 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1328 {
1329 return -EOPNOTSUPP;
1330 }
1331
1332 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1333 {
1334 struct net *net = sock_net(sk);
1335 struct sk_buff *resp_skb;
1336 struct sadb_x_sa2 *sa2;
1337 struct sadb_address *saddr, *daddr;
1338 struct sadb_msg *out_hdr;
1339 struct sadb_spirange *range;
1340 struct xfrm_state *x = NULL;
1341 int mode;
1342 int err;
1343 u32 min_spi, max_spi;
1344 u32 reqid;
1345 u8 proto;
1346 unsigned short family;
1347 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1348
1349 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1350 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1351 return -EINVAL;
1352
1353 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1354 if (proto == 0)
1355 return -EINVAL;
1356
1357 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1358 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1359 if (mode < 0)
1360 return -EINVAL;
1361 reqid = sa2->sadb_x_sa2_reqid;
1362 } else {
1363 mode = 0;
1364 reqid = 0;
1365 }
1366
1367 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1368 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1369
1370 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1371 switch (family) {
1372 case AF_INET:
1373 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1374 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1375 break;
1376 #if IS_ENABLED(CONFIG_IPV6)
1377 case AF_INET6:
1378 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1379 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1380 break;
1381 #endif
1382 }
1383
1384 if (hdr->sadb_msg_seq) {
1385 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1386 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1387 xfrm_state_put(x);
1388 x = NULL;
1389 }
1390 }
1391
1392 if (!x)
1393 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1394
1395 if (x == NULL)
1396 return -ENOENT;
1397
1398 min_spi = 0x100;
1399 max_spi = 0x0fffffff;
1400
1401 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1402 if (range) {
1403 min_spi = range->sadb_spirange_min;
1404 max_spi = range->sadb_spirange_max;
1405 }
1406
1407 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1408 if (err) {
1409 xfrm_state_put(x);
1410 return err;
1411 }
1412
1413 err = xfrm_alloc_spi(x, min_spi, max_spi);
1414 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1415
1416 if (IS_ERR(resp_skb)) {
1417 xfrm_state_put(x);
1418 return PTR_ERR(resp_skb);
1419 }
1420
1421 out_hdr = (struct sadb_msg *) resp_skb->data;
1422 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1423 out_hdr->sadb_msg_type = SADB_GETSPI;
1424 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1425 out_hdr->sadb_msg_errno = 0;
1426 out_hdr->sadb_msg_reserved = 0;
1427 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1428 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1429
1430 xfrm_state_put(x);
1431
1432 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1433
1434 return 0;
1435 }
1436
1437 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1438 {
1439 struct net *net = sock_net(sk);
1440 struct xfrm_state *x;
1441
1442 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1443 return -EOPNOTSUPP;
1444
1445 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1446 return 0;
1447
1448 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1449 if (x == NULL)
1450 return 0;
1451
1452 spin_lock_bh(&x->lock);
1453 if (x->km.state == XFRM_STATE_ACQ)
1454 x->km.state = XFRM_STATE_ERROR;
1455
1456 spin_unlock_bh(&x->lock);
1457 xfrm_state_put(x);
1458 return 0;
1459 }
1460
1461 static inline int event2poltype(int event)
1462 {
1463 switch (event) {
1464 case XFRM_MSG_DELPOLICY:
1465 return SADB_X_SPDDELETE;
1466 case XFRM_MSG_NEWPOLICY:
1467 return SADB_X_SPDADD;
1468 case XFRM_MSG_UPDPOLICY:
1469 return SADB_X_SPDUPDATE;
1470 case XFRM_MSG_POLEXPIRE:
1471 // return SADB_X_SPDEXPIRE;
1472 default:
1473 pr_err("pfkey: Unknown policy event %d\n", event);
1474 break;
1475 }
1476
1477 return 0;
1478 }
1479
1480 static inline int event2keytype(int event)
1481 {
1482 switch (event) {
1483 case XFRM_MSG_DELSA:
1484 return SADB_DELETE;
1485 case XFRM_MSG_NEWSA:
1486 return SADB_ADD;
1487 case XFRM_MSG_UPDSA:
1488 return SADB_UPDATE;
1489 case XFRM_MSG_EXPIRE:
1490 return SADB_EXPIRE;
1491 default:
1492 pr_err("pfkey: Unknown SA event %d\n", event);
1493 break;
1494 }
1495
1496 return 0;
1497 }
1498
1499 /* ADD/UPD/DEL */
1500 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1501 {
1502 struct sk_buff *skb;
1503 struct sadb_msg *hdr;
1504
1505 skb = pfkey_xfrm_state2msg(x);
1506
1507 if (IS_ERR(skb))
1508 return PTR_ERR(skb);
1509
1510 hdr = (struct sadb_msg *) skb->data;
1511 hdr->sadb_msg_version = PF_KEY_V2;
1512 hdr->sadb_msg_type = event2keytype(c->event);
1513 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1514 hdr->sadb_msg_errno = 0;
1515 hdr->sadb_msg_reserved = 0;
1516 hdr->sadb_msg_seq = c->seq;
1517 hdr->sadb_msg_pid = c->portid;
1518
1519 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1520
1521 return 0;
1522 }
1523
1524 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1525 {
1526 struct net *net = sock_net(sk);
1527 struct xfrm_state *x;
1528 int err;
1529 struct km_event c;
1530
1531 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1532 if (IS_ERR(x))
1533 return PTR_ERR(x);
1534
1535 xfrm_state_hold(x);
1536 if (hdr->sadb_msg_type == SADB_ADD)
1537 err = xfrm_state_add(x);
1538 else
1539 err = xfrm_state_update(x);
1540
1541 xfrm_audit_state_add(x, err ? 0 : 1, true);
1542
1543 if (err < 0) {
1544 x->km.state = XFRM_STATE_DEAD;
1545 __xfrm_state_put(x);
1546 goto out;
1547 }
1548
1549 if (hdr->sadb_msg_type == SADB_ADD)
1550 c.event = XFRM_MSG_NEWSA;
1551 else
1552 c.event = XFRM_MSG_UPDSA;
1553 c.seq = hdr->sadb_msg_seq;
1554 c.portid = hdr->sadb_msg_pid;
1555 km_state_notify(x, &c);
1556 out:
1557 xfrm_state_put(x);
1558 return err;
1559 }
1560
1561 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1562 {
1563 struct net *net = sock_net(sk);
1564 struct xfrm_state *x;
1565 struct km_event c;
1566 int err;
1567
1568 if (!ext_hdrs[SADB_EXT_SA-1] ||
1569 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1570 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1571 return -EINVAL;
1572
1573 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1574 if (x == NULL)
1575 return -ESRCH;
1576
1577 if ((err = security_xfrm_state_delete(x)))
1578 goto out;
1579
1580 if (xfrm_state_kern(x)) {
1581 err = -EPERM;
1582 goto out;
1583 }
1584
1585 err = xfrm_state_delete(x);
1586
1587 if (err < 0)
1588 goto out;
1589
1590 c.seq = hdr->sadb_msg_seq;
1591 c.portid = hdr->sadb_msg_pid;
1592 c.event = XFRM_MSG_DELSA;
1593 km_state_notify(x, &c);
1594 out:
1595 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1596 xfrm_state_put(x);
1597
1598 return err;
1599 }
1600
1601 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1602 {
1603 struct net *net = sock_net(sk);
1604 __u8 proto;
1605 struct sk_buff *out_skb;
1606 struct sadb_msg *out_hdr;
1607 struct xfrm_state *x;
1608
1609 if (!ext_hdrs[SADB_EXT_SA-1] ||
1610 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1611 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1612 return -EINVAL;
1613
1614 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1615 if (x == NULL)
1616 return -ESRCH;
1617
1618 out_skb = pfkey_xfrm_state2msg(x);
1619 proto = x->id.proto;
1620 xfrm_state_put(x);
1621 if (IS_ERR(out_skb))
1622 return PTR_ERR(out_skb);
1623
1624 out_hdr = (struct sadb_msg *) out_skb->data;
1625 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1626 out_hdr->sadb_msg_type = SADB_GET;
1627 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1628 out_hdr->sadb_msg_errno = 0;
1629 out_hdr->sadb_msg_reserved = 0;
1630 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1631 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1632 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1633
1634 return 0;
1635 }
1636
1637 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1638 gfp_t allocation)
1639 {
1640 struct sk_buff *skb;
1641 struct sadb_msg *hdr;
1642 int len, auth_len, enc_len, i;
1643
1644 auth_len = xfrm_count_pfkey_auth_supported();
1645 if (auth_len) {
1646 auth_len *= sizeof(struct sadb_alg);
1647 auth_len += sizeof(struct sadb_supported);
1648 }
1649
1650 enc_len = xfrm_count_pfkey_enc_supported();
1651 if (enc_len) {
1652 enc_len *= sizeof(struct sadb_alg);
1653 enc_len += sizeof(struct sadb_supported);
1654 }
1655
1656 len = enc_len + auth_len + sizeof(struct sadb_msg);
1657
1658 skb = alloc_skb(len + 16, allocation);
1659 if (!skb)
1660 goto out_put_algs;
1661
1662 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1663 pfkey_hdr_dup(hdr, orig);
1664 hdr->sadb_msg_errno = 0;
1665 hdr->sadb_msg_len = len / sizeof(uint64_t);
1666
1667 if (auth_len) {
1668 struct sadb_supported *sp;
1669 struct sadb_alg *ap;
1670
1671 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1672 ap = (struct sadb_alg *) (sp + 1);
1673
1674 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1675 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1676
1677 for (i = 0; ; i++) {
1678 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1679 if (!aalg)
1680 break;
1681 if (!aalg->pfkey_supported)
1682 continue;
1683 if (aalg->available)
1684 *ap++ = aalg->desc;
1685 }
1686 }
1687
1688 if (enc_len) {
1689 struct sadb_supported *sp;
1690 struct sadb_alg *ap;
1691
1692 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1693 ap = (struct sadb_alg *) (sp + 1);
1694
1695 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1696 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1697
1698 for (i = 0; ; i++) {
1699 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1700 if (!ealg)
1701 break;
1702 if (!ealg->pfkey_supported)
1703 continue;
1704 if (ealg->available)
1705 *ap++ = ealg->desc;
1706 }
1707 }
1708
1709 out_put_algs:
1710 return skb;
1711 }
1712
1713 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1714 {
1715 struct pfkey_sock *pfk = pfkey_sk(sk);
1716 struct sk_buff *supp_skb;
1717
1718 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1719 return -EINVAL;
1720
1721 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1722 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1723 return -EEXIST;
1724 pfk->registered |= (1<<hdr->sadb_msg_satype);
1725 }
1726
1727 xfrm_probe_algs();
1728
1729 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1730 if (!supp_skb) {
1731 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1732 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1733
1734 return -ENOBUFS;
1735 }
1736
1737 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1738 sock_net(sk));
1739 return 0;
1740 }
1741
1742 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1743 {
1744 struct sk_buff *skb;
1745 struct sadb_msg *hdr;
1746
1747 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1748 if (!skb)
1749 return -ENOBUFS;
1750
1751 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1752 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1753 hdr->sadb_msg_errno = (uint8_t) 0;
1754 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1755
1756 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1757 sock_net(sk));
1758 }
1759
1760 static int key_notify_sa_flush(const struct km_event *c)
1761 {
1762 struct sk_buff *skb;
1763 struct sadb_msg *hdr;
1764
1765 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1766 if (!skb)
1767 return -ENOBUFS;
1768 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1769 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1770 hdr->sadb_msg_type = SADB_FLUSH;
1771 hdr->sadb_msg_seq = c->seq;
1772 hdr->sadb_msg_pid = c->portid;
1773 hdr->sadb_msg_version = PF_KEY_V2;
1774 hdr->sadb_msg_errno = (uint8_t) 0;
1775 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1776 hdr->sadb_msg_reserved = 0;
1777
1778 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1779
1780 return 0;
1781 }
1782
1783 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1784 {
1785 struct net *net = sock_net(sk);
1786 unsigned int proto;
1787 struct km_event c;
1788 int err, err2;
1789
1790 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1791 if (proto == 0)
1792 return -EINVAL;
1793
1794 err = xfrm_state_flush(net, proto, true);
1795 err2 = unicast_flush_resp(sk, hdr);
1796 if (err || err2) {
1797 if (err == -ESRCH) /* empty table - go quietly */
1798 err = 0;
1799 return err ? err : err2;
1800 }
1801
1802 c.data.proto = proto;
1803 c.seq = hdr->sadb_msg_seq;
1804 c.portid = hdr->sadb_msg_pid;
1805 c.event = XFRM_MSG_FLUSHSA;
1806 c.net = net;
1807 km_state_notify(NULL, &c);
1808
1809 return 0;
1810 }
1811
1812 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1813 {
1814 struct pfkey_sock *pfk = ptr;
1815 struct sk_buff *out_skb;
1816 struct sadb_msg *out_hdr;
1817
1818 if (!pfkey_can_dump(&pfk->sk))
1819 return -ENOBUFS;
1820
1821 out_skb = pfkey_xfrm_state2msg(x);
1822 if (IS_ERR(out_skb))
1823 return PTR_ERR(out_skb);
1824
1825 out_hdr = (struct sadb_msg *) out_skb->data;
1826 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1827 out_hdr->sadb_msg_type = SADB_DUMP;
1828 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1829 out_hdr->sadb_msg_errno = 0;
1830 out_hdr->sadb_msg_reserved = 0;
1831 out_hdr->sadb_msg_seq = count + 1;
1832 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1833
1834 if (pfk->dump.skb)
1835 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1836 &pfk->sk, sock_net(&pfk->sk));
1837 pfk->dump.skb = out_skb;
1838
1839 return 0;
1840 }
1841
1842 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1843 {
1844 struct net *net = sock_net(&pfk->sk);
1845 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1846 }
1847
1848 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1849 {
1850 struct net *net = sock_net(&pfk->sk);
1851
1852 xfrm_state_walk_done(&pfk->dump.u.state, net);
1853 }
1854
1855 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1856 {
1857 u8 proto;
1858 struct xfrm_address_filter *filter = NULL;
1859 struct pfkey_sock *pfk = pfkey_sk(sk);
1860
1861 mutex_lock(&pfk->dump_lock);
1862 if (pfk->dump.dump != NULL) {
1863 mutex_unlock(&pfk->dump_lock);
1864 return -EBUSY;
1865 }
1866
1867 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1868 if (proto == 0) {
1869 mutex_unlock(&pfk->dump_lock);
1870 return -EINVAL;
1871 }
1872
1873 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1874 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1875
1876 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1877 if (filter == NULL) {
1878 mutex_unlock(&pfk->dump_lock);
1879 return -ENOMEM;
1880 }
1881
1882 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1883 sizeof(xfrm_address_t));
1884 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1885 sizeof(xfrm_address_t));
1886 filter->family = xfilter->sadb_x_filter_family;
1887 filter->splen = xfilter->sadb_x_filter_splen;
1888 filter->dplen = xfilter->sadb_x_filter_dplen;
1889 }
1890
1891 pfk->dump.msg_version = hdr->sadb_msg_version;
1892 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1893 pfk->dump.dump = pfkey_dump_sa;
1894 pfk->dump.done = pfkey_dump_sa_done;
1895 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1896 mutex_unlock(&pfk->dump_lock);
1897
1898 return pfkey_do_dump(pfk);
1899 }
1900
1901 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1902 {
1903 struct pfkey_sock *pfk = pfkey_sk(sk);
1904 int satype = hdr->sadb_msg_satype;
1905 bool reset_errno = false;
1906
1907 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1908 reset_errno = true;
1909 if (satype != 0 && satype != 1)
1910 return -EINVAL;
1911 pfk->promisc = satype;
1912 }
1913 if (reset_errno && skb_cloned(skb))
1914 skb = skb_copy(skb, GFP_KERNEL);
1915 else
1916 skb = skb_clone(skb, GFP_KERNEL);
1917
1918 if (reset_errno && skb) {
1919 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1920 new_hdr->sadb_msg_errno = 0;
1921 }
1922
1923 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1924 return 0;
1925 }
1926
1927 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1928 {
1929 int i;
1930 u32 reqid = *(u32*)ptr;
1931
1932 for (i=0; i<xp->xfrm_nr; i++) {
1933 if (xp->xfrm_vec[i].reqid == reqid)
1934 return -EEXIST;
1935 }
1936 return 0;
1937 }
1938
1939 static u32 gen_reqid(struct net *net)
1940 {
1941 struct xfrm_policy_walk walk;
1942 u32 start;
1943 int rc;
1944 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1945
1946 start = reqid;
1947 do {
1948 ++reqid;
1949 if (reqid == 0)
1950 reqid = IPSEC_MANUAL_REQID_MAX+1;
1951 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1952 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1953 xfrm_policy_walk_done(&walk, net);
1954 if (rc != -EEXIST)
1955 return reqid;
1956 } while (reqid != start);
1957 return 0;
1958 }
1959
1960 static int
1961 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1962 {
1963 struct net *net = xp_net(xp);
1964 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1965 int mode;
1966
1967 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1968 return -ELOOP;
1969
1970 if (rq->sadb_x_ipsecrequest_mode == 0)
1971 return -EINVAL;
1972
1973 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1974 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1975 return -EINVAL;
1976 t->mode = mode;
1977 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1978 t->optional = 1;
1979 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1980 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1981 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1982 t->reqid = 0;
1983 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1984 return -ENOBUFS;
1985 }
1986
1987 /* addresses present only in tunnel mode */
1988 if (t->mode == XFRM_MODE_TUNNEL) {
1989 int err;
1990
1991 err = parse_sockaddr_pair(
1992 (struct sockaddr *)(rq + 1),
1993 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1994 &t->saddr, &t->id.daddr, &t->encap_family);
1995 if (err)
1996 return err;
1997 } else
1998 t->encap_family = xp->family;
1999
2000 /* No way to set this via kame pfkey */
2001 t->allalgs = 1;
2002 xp->xfrm_nr++;
2003 return 0;
2004 }
2005
2006 static int
2007 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2008 {
2009 int err;
2010 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2011 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2012
2013 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2014 return -EINVAL;
2015
2016 while (len >= sizeof(*rq)) {
2017 if (len < rq->sadb_x_ipsecrequest_len ||
2018 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2019 return -EINVAL;
2020
2021 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2022 return err;
2023 len -= rq->sadb_x_ipsecrequest_len;
2024 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2025 }
2026 return 0;
2027 }
2028
2029 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2030 {
2031 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2032
2033 if (xfrm_ctx) {
2034 int len = sizeof(struct sadb_x_sec_ctx);
2035 len += xfrm_ctx->ctx_len;
2036 return PFKEY_ALIGN8(len);
2037 }
2038 return 0;
2039 }
2040
2041 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2042 {
2043 const struct xfrm_tmpl *t;
2044 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2045 int socklen = 0;
2046 int i;
2047
2048 for (i=0; i<xp->xfrm_nr; i++) {
2049 t = xp->xfrm_vec + i;
2050 socklen += pfkey_sockaddr_len(t->encap_family);
2051 }
2052
2053 return sizeof(struct sadb_msg) +
2054 (sizeof(struct sadb_lifetime) * 3) +
2055 (sizeof(struct sadb_address) * 2) +
2056 (sockaddr_size * 2) +
2057 sizeof(struct sadb_x_policy) +
2058 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2059 (socklen * 2) +
2060 pfkey_xfrm_policy2sec_ctx_size(xp);
2061 }
2062
2063 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2064 {
2065 struct sk_buff *skb;
2066 int size;
2067
2068 size = pfkey_xfrm_policy2msg_size(xp);
2069
2070 skb = alloc_skb(size + 16, GFP_ATOMIC);
2071 if (skb == NULL)
2072 return ERR_PTR(-ENOBUFS);
2073
2074 return skb;
2075 }
2076
2077 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2078 {
2079 struct sadb_msg *hdr;
2080 struct sadb_address *addr;
2081 struct sadb_lifetime *lifetime;
2082 struct sadb_x_policy *pol;
2083 struct sadb_x_sec_ctx *sec_ctx;
2084 struct xfrm_sec_ctx *xfrm_ctx;
2085 int i;
2086 int size;
2087 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2088 int socklen = pfkey_sockaddr_len(xp->family);
2089
2090 size = pfkey_xfrm_policy2msg_size(xp);
2091
2092 /* call should fill header later */
2093 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2094 memset(hdr, 0, size); /* XXX do we need this ? */
2095
2096 /* src address */
2097 addr = (struct sadb_address*) skb_put(skb,
2098 sizeof(struct sadb_address)+sockaddr_size);
2099 addr->sadb_address_len =
2100 (sizeof(struct sadb_address)+sockaddr_size)/
2101 sizeof(uint64_t);
2102 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2103 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2104 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2105 addr->sadb_address_reserved = 0;
2106 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2107 xp->selector.sport,
2108 (struct sockaddr *) (addr + 1),
2109 xp->family))
2110 BUG();
2111
2112 /* dst address */
2113 addr = (struct sadb_address*) skb_put(skb,
2114 sizeof(struct sadb_address)+sockaddr_size);
2115 addr->sadb_address_len =
2116 (sizeof(struct sadb_address)+sockaddr_size)/
2117 sizeof(uint64_t);
2118 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2119 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2120 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2121 addr->sadb_address_reserved = 0;
2122
2123 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2124 (struct sockaddr *) (addr + 1),
2125 xp->family);
2126
2127 /* hard time */
2128 lifetime = (struct sadb_lifetime *) skb_put(skb,
2129 sizeof(struct sadb_lifetime));
2130 lifetime->sadb_lifetime_len =
2131 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2132 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2133 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2134 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2135 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2136 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2137 /* soft time */
2138 lifetime = (struct sadb_lifetime *) skb_put(skb,
2139 sizeof(struct sadb_lifetime));
2140 lifetime->sadb_lifetime_len =
2141 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2142 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2143 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2144 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2145 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2146 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2147 /* current time */
2148 lifetime = (struct sadb_lifetime *) skb_put(skb,
2149 sizeof(struct sadb_lifetime));
2150 lifetime->sadb_lifetime_len =
2151 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2152 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2153 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2154 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2155 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2156 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2157
2158 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2159 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2160 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2161 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2162 if (xp->action == XFRM_POLICY_ALLOW) {
2163 if (xp->xfrm_nr)
2164 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2165 else
2166 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2167 }
2168 pol->sadb_x_policy_dir = dir+1;
2169 pol->sadb_x_policy_reserved = 0;
2170 pol->sadb_x_policy_id = xp->index;
2171 pol->sadb_x_policy_priority = xp->priority;
2172
2173 for (i=0; i<xp->xfrm_nr; i++) {
2174 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2175 struct sadb_x_ipsecrequest *rq;
2176 int req_size;
2177 int mode;
2178
2179 req_size = sizeof(struct sadb_x_ipsecrequest);
2180 if (t->mode == XFRM_MODE_TUNNEL) {
2181 socklen = pfkey_sockaddr_len(t->encap_family);
2182 req_size += socklen * 2;
2183 } else {
2184 size -= 2*socklen;
2185 }
2186 rq = (void*)skb_put(skb, req_size);
2187 pol->sadb_x_policy_len += req_size/8;
2188 memset(rq, 0, sizeof(*rq));
2189 rq->sadb_x_ipsecrequest_len = req_size;
2190 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2191 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2192 return -EINVAL;
2193 rq->sadb_x_ipsecrequest_mode = mode;
2194 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2195 if (t->reqid)
2196 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2197 if (t->optional)
2198 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2199 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2200
2201 if (t->mode == XFRM_MODE_TUNNEL) {
2202 u8 *sa = (void *)(rq + 1);
2203 pfkey_sockaddr_fill(&t->saddr, 0,
2204 (struct sockaddr *)sa,
2205 t->encap_family);
2206 pfkey_sockaddr_fill(&t->id.daddr, 0,
2207 (struct sockaddr *) (sa + socklen),
2208 t->encap_family);
2209 }
2210 }
2211
2212 /* security context */
2213 if ((xfrm_ctx = xp->security)) {
2214 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2215
2216 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2217 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2218 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2219 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2220 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2221 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2222 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2223 xfrm_ctx->ctx_len);
2224 }
2225
2226 hdr->sadb_msg_len = size / sizeof(uint64_t);
2227 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2228
2229 return 0;
2230 }
2231
2232 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2233 {
2234 struct sk_buff *out_skb;
2235 struct sadb_msg *out_hdr;
2236 int err;
2237
2238 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2239 if (IS_ERR(out_skb))
2240 return PTR_ERR(out_skb);
2241
2242 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2243 if (err < 0)
2244 return err;
2245
2246 out_hdr = (struct sadb_msg *) out_skb->data;
2247 out_hdr->sadb_msg_version = PF_KEY_V2;
2248
2249 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2250 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2251 else
2252 out_hdr->sadb_msg_type = event2poltype(c->event);
2253 out_hdr->sadb_msg_errno = 0;
2254 out_hdr->sadb_msg_seq = c->seq;
2255 out_hdr->sadb_msg_pid = c->portid;
2256 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2257 return 0;
2258
2259 }
2260
2261 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2262 {
2263 struct net *net = sock_net(sk);
2264 int err = 0;
2265 struct sadb_lifetime *lifetime;
2266 struct sadb_address *sa;
2267 struct sadb_x_policy *pol;
2268 struct xfrm_policy *xp;
2269 struct km_event c;
2270 struct sadb_x_sec_ctx *sec_ctx;
2271
2272 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2273 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2274 !ext_hdrs[SADB_X_EXT_POLICY-1])
2275 return -EINVAL;
2276
2277 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2278 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2279 return -EINVAL;
2280 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2281 return -EINVAL;
2282
2283 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2284 if (xp == NULL)
2285 return -ENOBUFS;
2286
2287 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2288 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2289 xp->priority = pol->sadb_x_policy_priority;
2290
2291 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2292 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2293 xp->selector.family = xp->family;
2294 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2295 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2296 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2297 if (xp->selector.sport)
2298 xp->selector.sport_mask = htons(0xffff);
2299
2300 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2301 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2302 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2303
2304 /* Amusing, we set this twice. KAME apps appear to set same value
2305 * in both addresses.
2306 */
2307 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2308
2309 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2310 if (xp->selector.dport)
2311 xp->selector.dport_mask = htons(0xffff);
2312
2313 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2314 if (sec_ctx != NULL) {
2315 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2316
2317 if (!uctx) {
2318 err = -ENOBUFS;
2319 goto out;
2320 }
2321
2322 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2323 kfree(uctx);
2324
2325 if (err)
2326 goto out;
2327 }
2328
2329 xp->lft.soft_byte_limit = XFRM_INF;
2330 xp->lft.hard_byte_limit = XFRM_INF;
2331 xp->lft.soft_packet_limit = XFRM_INF;
2332 xp->lft.hard_packet_limit = XFRM_INF;
2333 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2334 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2335 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2336 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2337 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2338 }
2339 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2340 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2341 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2342 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2343 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2344 }
2345 xp->xfrm_nr = 0;
2346 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2347 (err = parse_ipsecrequests(xp, pol)) < 0)
2348 goto out;
2349
2350 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2351 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2352
2353 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2354
2355 if (err)
2356 goto out;
2357
2358 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2359 c.event = XFRM_MSG_UPDPOLICY;
2360 else
2361 c.event = XFRM_MSG_NEWPOLICY;
2362
2363 c.seq = hdr->sadb_msg_seq;
2364 c.portid = hdr->sadb_msg_pid;
2365
2366 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367 xfrm_pol_put(xp);
2368 return 0;
2369
2370 out:
2371 xp->walk.dead = 1;
2372 xfrm_policy_destroy(xp);
2373 return err;
2374 }
2375
2376 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2377 {
2378 struct net *net = sock_net(sk);
2379 int err;
2380 struct sadb_address *sa;
2381 struct sadb_x_policy *pol;
2382 struct xfrm_policy *xp;
2383 struct xfrm_selector sel;
2384 struct km_event c;
2385 struct sadb_x_sec_ctx *sec_ctx;
2386 struct xfrm_sec_ctx *pol_ctx = NULL;
2387
2388 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2389 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2390 !ext_hdrs[SADB_X_EXT_POLICY-1])
2391 return -EINVAL;
2392
2393 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2394 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2395 return -EINVAL;
2396
2397 memset(&sel, 0, sizeof(sel));
2398
2399 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2400 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2401 sel.prefixlen_s = sa->sadb_address_prefixlen;
2402 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2403 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2404 if (sel.sport)
2405 sel.sport_mask = htons(0xffff);
2406
2407 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2408 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2409 sel.prefixlen_d = sa->sadb_address_prefixlen;
2410 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2411 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2412 if (sel.dport)
2413 sel.dport_mask = htons(0xffff);
2414
2415 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2416 if (sec_ctx != NULL) {
2417 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2418
2419 if (!uctx)
2420 return -ENOMEM;
2421
2422 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2423 kfree(uctx);
2424 if (err)
2425 return err;
2426 }
2427
2428 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2429 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2430 1, &err);
2431 security_xfrm_policy_free(pol_ctx);
2432 if (xp == NULL)
2433 return -ENOENT;
2434
2435 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2436
2437 if (err)
2438 goto out;
2439
2440 c.seq = hdr->sadb_msg_seq;
2441 c.portid = hdr->sadb_msg_pid;
2442 c.data.byid = 0;
2443 c.event = XFRM_MSG_DELPOLICY;
2444 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2445
2446 out:
2447 xfrm_pol_put(xp);
2448 if (err == 0)
2449 xfrm_garbage_collect(net);
2450 return err;
2451 }
2452
2453 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2454 {
2455 int err;
2456 struct sk_buff *out_skb;
2457 struct sadb_msg *out_hdr;
2458 err = 0;
2459
2460 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2461 if (IS_ERR(out_skb)) {
2462 err = PTR_ERR(out_skb);
2463 goto out;
2464 }
2465 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2466 if (err < 0)
2467 goto out;
2468
2469 out_hdr = (struct sadb_msg *) out_skb->data;
2470 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2471 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2472 out_hdr->sadb_msg_satype = 0;
2473 out_hdr->sadb_msg_errno = 0;
2474 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2475 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2476 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2477 err = 0;
2478
2479 out:
2480 return err;
2481 }
2482
2483 static int pfkey_sockaddr_pair_size(sa_family_t family)
2484 {
2485 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2486 }
2487
2488 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2489 xfrm_address_t *saddr, xfrm_address_t *daddr,
2490 u16 *family)
2491 {
2492 int af, socklen;
2493
2494 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2495 return -EINVAL;
2496
2497 af = pfkey_sockaddr_extract(sa, saddr);
2498 if (!af)
2499 return -EINVAL;
2500
2501 socklen = pfkey_sockaddr_len(af);
2502 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2503 daddr) != af)
2504 return -EINVAL;
2505
2506 *family = af;
2507 return 0;
2508 }
2509
2510 #ifdef CONFIG_NET_KEY_MIGRATE
2511 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2512 struct xfrm_migrate *m)
2513 {
2514 int err;
2515 struct sadb_x_ipsecrequest *rq2;
2516 int mode;
2517
2518 if (len < sizeof(*rq1) ||
2519 len < rq1->sadb_x_ipsecrequest_len ||
2520 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2521 return -EINVAL;
2522
2523 /* old endoints */
2524 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2525 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2526 &m->old_saddr, &m->old_daddr,
2527 &m->old_family);
2528 if (err)
2529 return err;
2530
2531 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2532 len -= rq1->sadb_x_ipsecrequest_len;
2533
2534 if (len <= sizeof(*rq2) ||
2535 len < rq2->sadb_x_ipsecrequest_len ||
2536 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2537 return -EINVAL;
2538
2539 /* new endpoints */
2540 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2541 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2542 &m->new_saddr, &m->new_daddr,
2543 &m->new_family);
2544 if (err)
2545 return err;
2546
2547 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2548 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2549 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2550 return -EINVAL;
2551
2552 m->proto = rq1->sadb_x_ipsecrequest_proto;
2553 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2554 return -EINVAL;
2555 m->mode = mode;
2556 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2557
2558 return ((int)(rq1->sadb_x_ipsecrequest_len +
2559 rq2->sadb_x_ipsecrequest_len));
2560 }
2561
2562 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2563 const struct sadb_msg *hdr, void * const *ext_hdrs)
2564 {
2565 int i, len, ret, err = -EINVAL;
2566 u8 dir;
2567 struct sadb_address *sa;
2568 struct sadb_x_kmaddress *kma;
2569 struct sadb_x_policy *pol;
2570 struct sadb_x_ipsecrequest *rq;
2571 struct xfrm_selector sel;
2572 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2573 struct xfrm_kmaddress k;
2574 struct net *net = sock_net(sk);
2575
2576 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2577 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2578 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2579 err = -EINVAL;
2580 goto out;
2581 }
2582
2583 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2584 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2585
2586 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2587 err = -EINVAL;
2588 goto out;
2589 }
2590
2591 if (kma) {
2592 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2593 k.reserved = kma->sadb_x_kmaddress_reserved;
2594 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2595 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2596 &k.local, &k.remote, &k.family);
2597 if (ret < 0) {
2598 err = ret;
2599 goto out;
2600 }
2601 }
2602
2603 dir = pol->sadb_x_policy_dir - 1;
2604 memset(&sel, 0, sizeof(sel));
2605
2606 /* set source address info of selector */
2607 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2608 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2609 sel.prefixlen_s = sa->sadb_address_prefixlen;
2610 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2611 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2612 if (sel.sport)
2613 sel.sport_mask = htons(0xffff);
2614
2615 /* set destination address info of selector */
2616 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2617 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2618 sel.prefixlen_d = sa->sadb_address_prefixlen;
2619 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2620 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2621 if (sel.dport)
2622 sel.dport_mask = htons(0xffff);
2623
2624 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2625
2626 /* extract ipsecrequests */
2627 i = 0;
2628 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2629
2630 while (len > 0 && i < XFRM_MAX_DEPTH) {
2631 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2632 if (ret < 0) {
2633 err = ret;
2634 goto out;
2635 } else {
2636 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2637 len -= ret;
2638 i++;
2639 }
2640 }
2641
2642 if (!i || len > 0) {
2643 err = -EINVAL;
2644 goto out;
2645 }
2646
2647 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2648 kma ? &k : NULL, net);
2649
2650 out:
2651 return err;
2652 }
2653 #else
2654 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2655 const struct sadb_msg *hdr, void * const *ext_hdrs)
2656 {
2657 return -ENOPROTOOPT;
2658 }
2659 #endif
2660
2661
2662 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2663 {
2664 struct net *net = sock_net(sk);
2665 unsigned int dir;
2666 int err = 0, delete;
2667 struct sadb_x_policy *pol;
2668 struct xfrm_policy *xp;
2669 struct km_event c;
2670
2671 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2672 return -EINVAL;
2673
2674 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2675 if (dir >= XFRM_POLICY_MAX)
2676 return -EINVAL;
2677
2678 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2679 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2680 dir, pol->sadb_x_policy_id, delete, &err);
2681 if (xp == NULL)
2682 return -ENOENT;
2683
2684 if (delete) {
2685 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2686
2687 if (err)
2688 goto out;
2689 c.seq = hdr->sadb_msg_seq;
2690 c.portid = hdr->sadb_msg_pid;
2691 c.data.byid = 1;
2692 c.event = XFRM_MSG_DELPOLICY;
2693 km_policy_notify(xp, dir, &c);
2694 } else {
2695 err = key_pol_get_resp(sk, xp, hdr, dir);
2696 }
2697
2698 out:
2699 xfrm_pol_put(xp);
2700 if (delete && err == 0)
2701 xfrm_garbage_collect(net);
2702 return err;
2703 }
2704
2705 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2706 {
2707 struct pfkey_sock *pfk = ptr;
2708 struct sk_buff *out_skb;
2709 struct sadb_msg *out_hdr;
2710 int err;
2711
2712 if (!pfkey_can_dump(&pfk->sk))
2713 return -ENOBUFS;
2714
2715 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2716 if (IS_ERR(out_skb))
2717 return PTR_ERR(out_skb);
2718
2719 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2720 if (err < 0)
2721 return err;
2722
2723 out_hdr = (struct sadb_msg *) out_skb->data;
2724 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2725 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2726 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2727 out_hdr->sadb_msg_errno = 0;
2728 out_hdr->sadb_msg_seq = count + 1;
2729 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2730
2731 if (pfk->dump.skb)
2732 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2733 &pfk->sk, sock_net(&pfk->sk));
2734 pfk->dump.skb = out_skb;
2735
2736 return 0;
2737 }
2738
2739 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2740 {
2741 struct net *net = sock_net(&pfk->sk);
2742 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2743 }
2744
2745 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2746 {
2747 struct net *net = sock_net((struct sock *)pfk);
2748
2749 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2750 }
2751
2752 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2753 {
2754 struct pfkey_sock *pfk = pfkey_sk(sk);
2755
2756 mutex_lock(&pfk->dump_lock);
2757 if (pfk->dump.dump != NULL) {
2758 mutex_unlock(&pfk->dump_lock);
2759 return -EBUSY;
2760 }
2761
2762 pfk->dump.msg_version = hdr->sadb_msg_version;
2763 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2764 pfk->dump.dump = pfkey_dump_sp;
2765 pfk->dump.done = pfkey_dump_sp_done;
2766 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2767 mutex_unlock(&pfk->dump_lock);
2768
2769 return pfkey_do_dump(pfk);
2770 }
2771
2772 static int key_notify_policy_flush(const struct km_event *c)
2773 {
2774 struct sk_buff *skb_out;
2775 struct sadb_msg *hdr;
2776
2777 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2778 if (!skb_out)
2779 return -ENOBUFS;
2780 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2781 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2782 hdr->sadb_msg_seq = c->seq;
2783 hdr->sadb_msg_pid = c->portid;
2784 hdr->sadb_msg_version = PF_KEY_V2;
2785 hdr->sadb_msg_errno = (uint8_t) 0;
2786 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2787 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2788 hdr->sadb_msg_reserved = 0;
2789 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2790 return 0;
2791
2792 }
2793
2794 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2795 {
2796 struct net *net = sock_net(sk);
2797 struct km_event c;
2798 int err, err2;
2799
2800 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2801 err2 = unicast_flush_resp(sk, hdr);
2802 if (err || err2) {
2803 if (err == -ESRCH) /* empty table - old silent behavior */
2804 return 0;
2805 return err;
2806 }
2807
2808 c.data.type = XFRM_POLICY_TYPE_MAIN;
2809 c.event = XFRM_MSG_FLUSHPOLICY;
2810 c.portid = hdr->sadb_msg_pid;
2811 c.seq = hdr->sadb_msg_seq;
2812 c.net = net;
2813 km_policy_notify(NULL, 0, &c);
2814
2815 return 0;
2816 }
2817
2818 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2819 const struct sadb_msg *hdr, void * const *ext_hdrs);
2820 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2821 [SADB_RESERVED] = pfkey_reserved,
2822 [SADB_GETSPI] = pfkey_getspi,
2823 [SADB_UPDATE] = pfkey_add,
2824 [SADB_ADD] = pfkey_add,
2825 [SADB_DELETE] = pfkey_delete,
2826 [SADB_GET] = pfkey_get,
2827 [SADB_ACQUIRE] = pfkey_acquire,
2828 [SADB_REGISTER] = pfkey_register,
2829 [SADB_EXPIRE] = NULL,
2830 [SADB_FLUSH] = pfkey_flush,
2831 [SADB_DUMP] = pfkey_dump,
2832 [SADB_X_PROMISC] = pfkey_promisc,
2833 [SADB_X_PCHANGE] = NULL,
2834 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2835 [SADB_X_SPDADD] = pfkey_spdadd,
2836 [SADB_X_SPDDELETE] = pfkey_spddelete,
2837 [SADB_X_SPDGET] = pfkey_spdget,
2838 [SADB_X_SPDACQUIRE] = NULL,
2839 [SADB_X_SPDDUMP] = pfkey_spddump,
2840 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2841 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2842 [SADB_X_SPDDELETE2] = pfkey_spdget,
2843 [SADB_X_MIGRATE] = pfkey_migrate,
2844 };
2845
2846 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2847 {
2848 void *ext_hdrs[SADB_EXT_MAX];
2849 int err;
2850
2851 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2852 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2853
2854 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2855 err = parse_exthdrs(skb, hdr, ext_hdrs);
2856 if (!err) {
2857 err = -EOPNOTSUPP;
2858 if (pfkey_funcs[hdr->sadb_msg_type])
2859 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2860 }
2861 return err;
2862 }
2863
2864 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2865 {
2866 struct sadb_msg *hdr = NULL;
2867
2868 if (skb->len < sizeof(*hdr)) {
2869 *errp = -EMSGSIZE;
2870 } else {
2871 hdr = (struct sadb_msg *) skb->data;
2872 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2873 hdr->sadb_msg_reserved != 0 ||
2874 (hdr->sadb_msg_type <= SADB_RESERVED ||
2875 hdr->sadb_msg_type > SADB_MAX)) {
2876 hdr = NULL;
2877 *errp = -EINVAL;
2878 } else if (hdr->sadb_msg_len != (skb->len /
2879 sizeof(uint64_t)) ||
2880 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2881 sizeof(uint64_t))) {
2882 hdr = NULL;
2883 *errp = -EMSGSIZE;
2884 } else {
2885 *errp = 0;
2886 }
2887 }
2888 return hdr;
2889 }
2890
2891 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2892 const struct xfrm_algo_desc *d)
2893 {
2894 unsigned int id = d->desc.sadb_alg_id;
2895
2896 if (id >= sizeof(t->aalgos) * 8)
2897 return 0;
2898
2899 return (t->aalgos >> id) & 1;
2900 }
2901
2902 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2903 const struct xfrm_algo_desc *d)
2904 {
2905 unsigned int id = d->desc.sadb_alg_id;
2906
2907 if (id >= sizeof(t->ealgos) * 8)
2908 return 0;
2909
2910 return (t->ealgos >> id) & 1;
2911 }
2912
2913 static int count_ah_combs(const struct xfrm_tmpl *t)
2914 {
2915 int i, sz = 0;
2916
2917 for (i = 0; ; i++) {
2918 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2919 if (!aalg)
2920 break;
2921 if (!aalg->pfkey_supported)
2922 continue;
2923 if (aalg_tmpl_set(t, aalg) && aalg->available)
2924 sz += sizeof(struct sadb_comb);
2925 }
2926 return sz + sizeof(struct sadb_prop);
2927 }
2928
2929 static int count_esp_combs(const struct xfrm_tmpl *t)
2930 {
2931 int i, k, sz = 0;
2932
2933 for (i = 0; ; i++) {
2934 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2935 if (!ealg)
2936 break;
2937
2938 if (!ealg->pfkey_supported)
2939 continue;
2940
2941 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2942 continue;
2943
2944 for (k = 1; ; k++) {
2945 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2946 if (!aalg)
2947 break;
2948
2949 if (!aalg->pfkey_supported)
2950 continue;
2951
2952 if (aalg_tmpl_set(t, aalg) && aalg->available)
2953 sz += sizeof(struct sadb_comb);
2954 }
2955 }
2956 return sz + sizeof(struct sadb_prop);
2957 }
2958
2959 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2960 {
2961 struct sadb_prop *p;
2962 int i;
2963
2964 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2965 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2966 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2967 p->sadb_prop_replay = 32;
2968 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2969
2970 for (i = 0; ; i++) {
2971 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2972 if (!aalg)
2973 break;
2974
2975 if (!aalg->pfkey_supported)
2976 continue;
2977
2978 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2979 struct sadb_comb *c;
2980 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2981 memset(c, 0, sizeof(*c));
2982 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2983 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2984 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2985 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2986 c->sadb_comb_hard_addtime = 24*60*60;
2987 c->sadb_comb_soft_addtime = 20*60*60;
2988 c->sadb_comb_hard_usetime = 8*60*60;
2989 c->sadb_comb_soft_usetime = 7*60*60;
2990 }
2991 }
2992 }
2993
2994 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2995 {
2996 struct sadb_prop *p;
2997 int i, k;
2998
2999 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
3000 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
3001 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
3002 p->sadb_prop_replay = 32;
3003 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3004
3005 for (i=0; ; i++) {
3006 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3007 if (!ealg)
3008 break;
3009
3010 if (!ealg->pfkey_supported)
3011 continue;
3012
3013 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3014 continue;
3015
3016 for (k = 1; ; k++) {
3017 struct sadb_comb *c;
3018 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3019 if (!aalg)
3020 break;
3021 if (!aalg->pfkey_supported)
3022 continue;
3023 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3024 continue;
3025 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
3026 memset(c, 0, sizeof(*c));
3027 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3028 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3029 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3030 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3031 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3032 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3033 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3034 c->sadb_comb_hard_addtime = 24*60*60;
3035 c->sadb_comb_soft_addtime = 20*60*60;
3036 c->sadb_comb_hard_usetime = 8*60*60;
3037 c->sadb_comb_soft_usetime = 7*60*60;
3038 }
3039 }
3040 }
3041
3042 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3043 {
3044 return 0;
3045 }
3046
3047 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3048 {
3049 struct sk_buff *out_skb;
3050 struct sadb_msg *out_hdr;
3051 int hard;
3052 int hsc;
3053
3054 hard = c->data.hard;
3055 if (hard)
3056 hsc = 2;
3057 else
3058 hsc = 1;
3059
3060 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3061 if (IS_ERR(out_skb))
3062 return PTR_ERR(out_skb);
3063
3064 out_hdr = (struct sadb_msg *) out_skb->data;
3065 out_hdr->sadb_msg_version = PF_KEY_V2;
3066 out_hdr->sadb_msg_type = SADB_EXPIRE;
3067 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3068 out_hdr->sadb_msg_errno = 0;
3069 out_hdr->sadb_msg_reserved = 0;
3070 out_hdr->sadb_msg_seq = 0;
3071 out_hdr->sadb_msg_pid = 0;
3072
3073 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3074 xs_net(x));
3075 return 0;
3076 }
3077
3078 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3079 {
3080 struct net *net = x ? xs_net(x) : c->net;
3081 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3082
3083 if (atomic_read(&net_pfkey->socks_nr) == 0)
3084 return 0;
3085
3086 switch (c->event) {
3087 case XFRM_MSG_EXPIRE:
3088 return key_notify_sa_expire(x, c);
3089 case XFRM_MSG_DELSA:
3090 case XFRM_MSG_NEWSA:
3091 case XFRM_MSG_UPDSA:
3092 return key_notify_sa(x, c);
3093 case XFRM_MSG_FLUSHSA:
3094 return key_notify_sa_flush(c);
3095 case XFRM_MSG_NEWAE: /* not yet supported */
3096 break;
3097 default:
3098 pr_err("pfkey: Unknown SA event %d\n", c->event);
3099 break;
3100 }
3101
3102 return 0;
3103 }
3104
3105 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3106 {
3107 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3108 return 0;
3109
3110 switch (c->event) {
3111 case XFRM_MSG_POLEXPIRE:
3112 return key_notify_policy_expire(xp, c);
3113 case XFRM_MSG_DELPOLICY:
3114 case XFRM_MSG_NEWPOLICY:
3115 case XFRM_MSG_UPDPOLICY:
3116 return key_notify_policy(xp, dir, c);
3117 case XFRM_MSG_FLUSHPOLICY:
3118 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3119 break;
3120 return key_notify_policy_flush(c);
3121 default:
3122 pr_err("pfkey: Unknown policy event %d\n", c->event);
3123 break;
3124 }
3125
3126 return 0;
3127 }
3128
3129 static u32 get_acqseq(void)
3130 {
3131 u32 res;
3132 static atomic_t acqseq;
3133
3134 do {
3135 res = atomic_inc_return(&acqseq);
3136 } while (!res);
3137 return res;
3138 }
3139
3140 static bool pfkey_is_alive(const struct km_event *c)
3141 {
3142 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3143 struct sock *sk;
3144 bool is_alive = false;
3145
3146 rcu_read_lock();
3147 sk_for_each_rcu(sk, &net_pfkey->table) {
3148 if (pfkey_sk(sk)->registered) {
3149 is_alive = true;
3150 break;
3151 }
3152 }
3153 rcu_read_unlock();
3154
3155 return is_alive;
3156 }
3157
3158 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3159 {
3160 struct sk_buff *skb;
3161 struct sadb_msg *hdr;
3162 struct sadb_address *addr;
3163 struct sadb_x_policy *pol;
3164 int sockaddr_size;
3165 int size;
3166 struct sadb_x_sec_ctx *sec_ctx;
3167 struct xfrm_sec_ctx *xfrm_ctx;
3168 int ctx_size = 0;
3169
3170 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3171 if (!sockaddr_size)
3172 return -EINVAL;
3173
3174 size = sizeof(struct sadb_msg) +
3175 (sizeof(struct sadb_address) * 2) +
3176 (sockaddr_size * 2) +
3177 sizeof(struct sadb_x_policy);
3178
3179 if (x->id.proto == IPPROTO_AH)
3180 size += count_ah_combs(t);
3181 else if (x->id.proto == IPPROTO_ESP)
3182 size += count_esp_combs(t);
3183
3184 if ((xfrm_ctx = x->security)) {
3185 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3186 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3187 }
3188
3189 skb = alloc_skb(size + 16, GFP_ATOMIC);
3190 if (skb == NULL)
3191 return -ENOMEM;
3192
3193 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3194 hdr->sadb_msg_version = PF_KEY_V2;
3195 hdr->sadb_msg_type = SADB_ACQUIRE;
3196 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3197 hdr->sadb_msg_len = size / sizeof(uint64_t);
3198 hdr->sadb_msg_errno = 0;
3199 hdr->sadb_msg_reserved = 0;
3200 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3201 hdr->sadb_msg_pid = 0;
3202
3203 /* src address */
3204 addr = (struct sadb_address*) skb_put(skb,
3205 sizeof(struct sadb_address)+sockaddr_size);
3206 addr->sadb_address_len =
3207 (sizeof(struct sadb_address)+sockaddr_size)/
3208 sizeof(uint64_t);
3209 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3210 addr->sadb_address_proto = 0;
3211 addr->sadb_address_reserved = 0;
3212 addr->sadb_address_prefixlen =
3213 pfkey_sockaddr_fill(&x->props.saddr, 0,
3214 (struct sockaddr *) (addr + 1),
3215 x->props.family);
3216 if (!addr->sadb_address_prefixlen)
3217 BUG();
3218
3219 /* dst address */
3220 addr = (struct sadb_address*) skb_put(skb,
3221 sizeof(struct sadb_address)+sockaddr_size);
3222 addr->sadb_address_len =
3223 (sizeof(struct sadb_address)+sockaddr_size)/
3224 sizeof(uint64_t);
3225 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3226 addr->sadb_address_proto = 0;
3227 addr->sadb_address_reserved = 0;
3228 addr->sadb_address_prefixlen =
3229 pfkey_sockaddr_fill(&x->id.daddr, 0,
3230 (struct sockaddr *) (addr + 1),
3231 x->props.family);
3232 if (!addr->sadb_address_prefixlen)
3233 BUG();
3234
3235 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3236 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3237 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3238 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3239 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3240 pol->sadb_x_policy_reserved = 0;
3241 pol->sadb_x_policy_id = xp->index;
3242 pol->sadb_x_policy_priority = xp->priority;
3243
3244 /* Set sadb_comb's. */
3245 if (x->id.proto == IPPROTO_AH)
3246 dump_ah_combs(skb, t);
3247 else if (x->id.proto == IPPROTO_ESP)
3248 dump_esp_combs(skb, t);
3249
3250 /* security context */
3251 if (xfrm_ctx) {
3252 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3253 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3254 sec_ctx->sadb_x_sec_len =
3255 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3256 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3257 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3258 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3259 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3260 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3261 xfrm_ctx->ctx_len);
3262 }
3263
3264 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3265 xs_net(x));
3266 }
3267
3268 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3269 u8 *data, int len, int *dir)
3270 {
3271 struct net *net = sock_net(sk);
3272 struct xfrm_policy *xp;
3273 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3274 struct sadb_x_sec_ctx *sec_ctx;
3275
3276 switch (sk->sk_family) {
3277 case AF_INET:
3278 if (opt != IP_IPSEC_POLICY) {
3279 *dir = -EOPNOTSUPP;
3280 return NULL;
3281 }
3282 break;
3283 #if IS_ENABLED(CONFIG_IPV6)
3284 case AF_INET6:
3285 if (opt != IPV6_IPSEC_POLICY) {
3286 *dir = -EOPNOTSUPP;
3287 return NULL;
3288 }
3289 break;
3290 #endif
3291 default:
3292 *dir = -EINVAL;
3293 return NULL;
3294 }
3295
3296 *dir = -EINVAL;
3297
3298 if (len < sizeof(struct sadb_x_policy) ||
3299 pol->sadb_x_policy_len*8 > len ||
3300 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3301 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3302 return NULL;
3303
3304 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3305 if (xp == NULL) {
3306 *dir = -ENOBUFS;
3307 return NULL;
3308 }
3309
3310 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3311 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3312
3313 xp->lft.soft_byte_limit = XFRM_INF;
3314 xp->lft.hard_byte_limit = XFRM_INF;
3315 xp->lft.soft_packet_limit = XFRM_INF;
3316 xp->lft.hard_packet_limit = XFRM_INF;
3317 xp->family = sk->sk_family;
3318
3319 xp->xfrm_nr = 0;
3320 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3321 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3322 goto out;
3323
3324 /* security context too */
3325 if (len >= (pol->sadb_x_policy_len*8 +
3326 sizeof(struct sadb_x_sec_ctx))) {
3327 char *p = (char *)pol;
3328 struct xfrm_user_sec_ctx *uctx;
3329
3330 p += pol->sadb_x_policy_len*8;
3331 sec_ctx = (struct sadb_x_sec_ctx *)p;
3332 if (len < pol->sadb_x_policy_len*8 +
3333 sec_ctx->sadb_x_sec_len*8) {
3334 *dir = -EINVAL;
3335 goto out;
3336 }
3337 if ((*dir = verify_sec_ctx_len(p)))
3338 goto out;
3339 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3340 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3341 kfree(uctx);
3342
3343 if (*dir)
3344 goto out;
3345 }
3346
3347 *dir = pol->sadb_x_policy_dir-1;
3348 return xp;
3349
3350 out:
3351 xp->walk.dead = 1;
3352 xfrm_policy_destroy(xp);
3353 return NULL;
3354 }
3355
3356 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3357 {
3358 struct sk_buff *skb;
3359 struct sadb_msg *hdr;
3360 struct sadb_sa *sa;
3361 struct sadb_address *addr;
3362 struct sadb_x_nat_t_port *n_port;
3363 int sockaddr_size;
3364 int size;
3365 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3366 struct xfrm_encap_tmpl *natt = NULL;
3367
3368 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3369 if (!sockaddr_size)
3370 return -EINVAL;
3371
3372 if (!satype)
3373 return -EINVAL;
3374
3375 if (!x->encap)
3376 return -EINVAL;
3377
3378 natt = x->encap;
3379
3380 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3381 *
3382 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3383 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3384 */
3385
3386 size = sizeof(struct sadb_msg) +
3387 sizeof(struct sadb_sa) +
3388 (sizeof(struct sadb_address) * 2) +
3389 (sockaddr_size * 2) +
3390 (sizeof(struct sadb_x_nat_t_port) * 2);
3391
3392 skb = alloc_skb(size + 16, GFP_ATOMIC);
3393 if (skb == NULL)
3394 return -ENOMEM;
3395
3396 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3397 hdr->sadb_msg_version = PF_KEY_V2;
3398 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3399 hdr->sadb_msg_satype = satype;
3400 hdr->sadb_msg_len = size / sizeof(uint64_t);
3401 hdr->sadb_msg_errno = 0;
3402 hdr->sadb_msg_reserved = 0;
3403 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3404 hdr->sadb_msg_pid = 0;
3405
3406 /* SA */
3407 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3408 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3409 sa->sadb_sa_exttype = SADB_EXT_SA;
3410 sa->sadb_sa_spi = x->id.spi;
3411 sa->sadb_sa_replay = 0;
3412 sa->sadb_sa_state = 0;
3413 sa->sadb_sa_auth = 0;
3414 sa->sadb_sa_encrypt = 0;
3415 sa->sadb_sa_flags = 0;
3416
3417 /* ADDRESS_SRC (old addr) */
3418 addr = (struct sadb_address*)
3419 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3420 addr->sadb_address_len =
3421 (sizeof(struct sadb_address)+sockaddr_size)/
3422 sizeof(uint64_t);
3423 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3424 addr->sadb_address_proto = 0;
3425 addr->sadb_address_reserved = 0;
3426 addr->sadb_address_prefixlen =
3427 pfkey_sockaddr_fill(&x->props.saddr, 0,
3428 (struct sockaddr *) (addr + 1),
3429 x->props.family);
3430 if (!addr->sadb_address_prefixlen)
3431 BUG();
3432
3433 /* NAT_T_SPORT (old port) */
3434 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3435 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3436 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3437 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3438 n_port->sadb_x_nat_t_port_reserved = 0;
3439
3440 /* ADDRESS_DST (new addr) */
3441 addr = (struct sadb_address*)
3442 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3443 addr->sadb_address_len =
3444 (sizeof(struct sadb_address)+sockaddr_size)/
3445 sizeof(uint64_t);
3446 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3447 addr->sadb_address_proto = 0;
3448 addr->sadb_address_reserved = 0;
3449 addr->sadb_address_prefixlen =
3450 pfkey_sockaddr_fill(ipaddr, 0,
3451 (struct sockaddr *) (addr + 1),
3452 x->props.family);
3453 if (!addr->sadb_address_prefixlen)
3454 BUG();
3455
3456 /* NAT_T_DPORT (new port) */
3457 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3458 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3459 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3460 n_port->sadb_x_nat_t_port_port = sport;
3461 n_port->sadb_x_nat_t_port_reserved = 0;
3462
3463 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3464 xs_net(x));
3465 }
3466
3467 #ifdef CONFIG_NET_KEY_MIGRATE
3468 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3469 const struct xfrm_selector *sel)
3470 {
3471 struct sadb_address *addr;
3472 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3473 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3474 addr->sadb_address_exttype = type;
3475 addr->sadb_address_proto = sel->proto;
3476 addr->sadb_address_reserved = 0;
3477
3478 switch (type) {
3479 case SADB_EXT_ADDRESS_SRC:
3480 addr->sadb_address_prefixlen = sel->prefixlen_s;
3481 pfkey_sockaddr_fill(&sel->saddr, 0,
3482 (struct sockaddr *)(addr + 1),
3483 sel->family);
3484 break;
3485 case SADB_EXT_ADDRESS_DST:
3486 addr->sadb_address_prefixlen = sel->prefixlen_d;
3487 pfkey_sockaddr_fill(&sel->daddr, 0,
3488 (struct sockaddr *)(addr + 1),
3489 sel->family);
3490 break;
3491 default:
3492 return -EINVAL;
3493 }
3494
3495 return 0;
3496 }
3497
3498
3499 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3500 {
3501 struct sadb_x_kmaddress *kma;
3502 u8 *sa;
3503 int family = k->family;
3504 int socklen = pfkey_sockaddr_len(family);
3505 int size_req;
3506
3507 size_req = (sizeof(struct sadb_x_kmaddress) +
3508 pfkey_sockaddr_pair_size(family));
3509
3510 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3511 memset(kma, 0, size_req);
3512 kma->sadb_x_kmaddress_len = size_req / 8;
3513 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3514 kma->sadb_x_kmaddress_reserved = k->reserved;
3515
3516 sa = (u8 *)(kma + 1);
3517 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3518 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3519 return -EINVAL;
3520
3521 return 0;
3522 }
3523
3524 static int set_ipsecrequest(struct sk_buff *skb,
3525 uint8_t proto, uint8_t mode, int level,
3526 uint32_t reqid, uint8_t family,
3527 const xfrm_address_t *src, const xfrm_address_t *dst)
3528 {
3529 struct sadb_x_ipsecrequest *rq;
3530 u8 *sa;
3531 int socklen = pfkey_sockaddr_len(family);
3532 int size_req;
3533
3534 size_req = sizeof(struct sadb_x_ipsecrequest) +
3535 pfkey_sockaddr_pair_size(family);
3536
3537 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3538 memset(rq, 0, size_req);
3539 rq->sadb_x_ipsecrequest_len = size_req;
3540 rq->sadb_x_ipsecrequest_proto = proto;
3541 rq->sadb_x_ipsecrequest_mode = mode;
3542 rq->sadb_x_ipsecrequest_level = level;
3543 rq->sadb_x_ipsecrequest_reqid = reqid;
3544
3545 sa = (u8 *) (rq + 1);
3546 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3547 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3548 return -EINVAL;
3549
3550 return 0;
3551 }
3552 #endif
3553
3554 #ifdef CONFIG_NET_KEY_MIGRATE
3555 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3556 const struct xfrm_migrate *m, int num_bundles,
3557 const struct xfrm_kmaddress *k)
3558 {
3559 int i;
3560 int sasize_sel;
3561 int size = 0;
3562 int size_pol = 0;
3563 struct sk_buff *skb;
3564 struct sadb_msg *hdr;
3565 struct sadb_x_policy *pol;
3566 const struct xfrm_migrate *mp;
3567
3568 if (type != XFRM_POLICY_TYPE_MAIN)
3569 return 0;
3570
3571 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3572 return -EINVAL;
3573
3574 if (k != NULL) {
3575 /* addresses for KM */
3576 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3577 pfkey_sockaddr_pair_size(k->family));
3578 }
3579
3580 /* selector */
3581 sasize_sel = pfkey_sockaddr_size(sel->family);
3582 if (!sasize_sel)
3583 return -EINVAL;
3584 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3585
3586 /* policy info */
3587 size_pol += sizeof(struct sadb_x_policy);
3588
3589 /* ipsecrequests */
3590 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3591 /* old locator pair */
3592 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3593 pfkey_sockaddr_pair_size(mp->old_family);
3594 /* new locator pair */
3595 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3596 pfkey_sockaddr_pair_size(mp->new_family);
3597 }
3598
3599 size += sizeof(struct sadb_msg) + size_pol;
3600
3601 /* alloc buffer */
3602 skb = alloc_skb(size, GFP_ATOMIC);
3603 if (skb == NULL)
3604 return -ENOMEM;
3605
3606 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3607 hdr->sadb_msg_version = PF_KEY_V2;
3608 hdr->sadb_msg_type = SADB_X_MIGRATE;
3609 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3610 hdr->sadb_msg_len = size / 8;
3611 hdr->sadb_msg_errno = 0;
3612 hdr->sadb_msg_reserved = 0;
3613 hdr->sadb_msg_seq = 0;
3614 hdr->sadb_msg_pid = 0;
3615
3616 /* Addresses to be used by KM for negotiation, if ext is available */
3617 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3618 goto err;
3619
3620 /* selector src */
3621 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3622
3623 /* selector dst */
3624 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3625
3626 /* policy information */
3627 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3628 pol->sadb_x_policy_len = size_pol / 8;
3629 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3630 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3631 pol->sadb_x_policy_dir = dir + 1;
3632 pol->sadb_x_policy_reserved = 0;
3633 pol->sadb_x_policy_id = 0;
3634 pol->sadb_x_policy_priority = 0;
3635
3636 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3637 /* old ipsecrequest */
3638 int mode = pfkey_mode_from_xfrm(mp->mode);
3639 if (mode < 0)
3640 goto err;
3641 if (set_ipsecrequest(skb, mp->proto, mode,
3642 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3643 mp->reqid, mp->old_family,
3644 &mp->old_saddr, &mp->old_daddr) < 0)
3645 goto err;
3646
3647 /* new ipsecrequest */
3648 if (set_ipsecrequest(skb, mp->proto, mode,
3649 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3650 mp->reqid, mp->new_family,
3651 &mp->new_saddr, &mp->new_daddr) < 0)
3652 goto err;
3653 }
3654
3655 /* broadcast migrate message to sockets */
3656 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3657
3658 return 0;
3659
3660 err:
3661 kfree_skb(skb);
3662 return -EINVAL;
3663 }
3664 #else
3665 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3666 const struct xfrm_migrate *m, int num_bundles,
3667 const struct xfrm_kmaddress *k)
3668 {
3669 return -ENOPROTOOPT;
3670 }
3671 #endif
3672
3673 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3674 {
3675 struct sock *sk = sock->sk;
3676 struct sk_buff *skb = NULL;
3677 struct sadb_msg *hdr = NULL;
3678 int err;
3679 struct net *net = sock_net(sk);
3680
3681 err = -EOPNOTSUPP;
3682 if (msg->msg_flags & MSG_OOB)
3683 goto out;
3684
3685 err = -EMSGSIZE;
3686 if ((unsigned int)len > sk->sk_sndbuf - 32)
3687 goto out;
3688
3689 err = -ENOBUFS;
3690 skb = alloc_skb(len, GFP_KERNEL);
3691 if (skb == NULL)
3692 goto out;
3693
3694 err = -EFAULT;
3695 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3696 goto out;
3697
3698 hdr = pfkey_get_base_msg(skb, &err);
3699 if (!hdr)
3700 goto out;
3701
3702 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3703 err = pfkey_process(sk, skb, hdr);
3704 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3705
3706 out:
3707 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3708 err = 0;
3709 kfree_skb(skb);
3710
3711 return err ? : len;
3712 }
3713
3714 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3715 int flags)
3716 {
3717 struct sock *sk = sock->sk;
3718 struct pfkey_sock *pfk = pfkey_sk(sk);
3719 struct sk_buff *skb;
3720 int copied, err;
3721
3722 err = -EINVAL;
3723 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3724 goto out;
3725
3726 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3727 if (skb == NULL)
3728 goto out;
3729
3730 copied = skb->len;
3731 if (copied > len) {
3732 msg->msg_flags |= MSG_TRUNC;
3733 copied = len;
3734 }
3735
3736 skb_reset_transport_header(skb);
3737 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3738 if (err)
3739 goto out_free;
3740
3741 sock_recv_ts_and_drops(msg, sk, skb);
3742
3743 err = (flags & MSG_TRUNC) ? skb->len : copied;
3744
3745 if (pfk->dump.dump != NULL &&
3746 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3747 pfkey_do_dump(pfk);
3748
3749 out_free:
3750 skb_free_datagram(sk, skb);
3751 out:
3752 return err;
3753 }
3754
3755 static const struct proto_ops pfkey_ops = {
3756 .family = PF_KEY,
3757 .owner = THIS_MODULE,
3758 /* Operations that make no sense on pfkey sockets. */
3759 .bind = sock_no_bind,
3760 .connect = sock_no_connect,
3761 .socketpair = sock_no_socketpair,
3762 .accept = sock_no_accept,
3763 .getname = sock_no_getname,
3764 .ioctl = sock_no_ioctl,
3765 .listen = sock_no_listen,
3766 .shutdown = sock_no_shutdown,
3767 .setsockopt = sock_no_setsockopt,
3768 .getsockopt = sock_no_getsockopt,
3769 .mmap = sock_no_mmap,
3770 .sendpage = sock_no_sendpage,
3771
3772 /* Now the operations that really occur. */
3773 .release = pfkey_release,
3774 .poll = datagram_poll,
3775 .sendmsg = pfkey_sendmsg,
3776 .recvmsg = pfkey_recvmsg,
3777 };
3778
3779 static const struct net_proto_family pfkey_family_ops = {
3780 .family = PF_KEY,
3781 .create = pfkey_create,
3782 .owner = THIS_MODULE,
3783 };
3784
3785 #ifdef CONFIG_PROC_FS
3786 static int pfkey_seq_show(struct seq_file *f, void *v)
3787 {
3788 struct sock *s = sk_entry(v);
3789
3790 if (v == SEQ_START_TOKEN)
3791 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3792 else
3793 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3794 s,
3795 atomic_read(&s->sk_refcnt),
3796 sk_rmem_alloc_get(s),
3797 sk_wmem_alloc_get(s),
3798 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3799 sock_i_ino(s)
3800 );
3801 return 0;
3802 }
3803
3804 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3805 __acquires(rcu)
3806 {
3807 struct net *net = seq_file_net(f);
3808 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3809
3810 rcu_read_lock();
3811 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3812 }
3813
3814 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3815 {
3816 struct net *net = seq_file_net(f);
3817 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3818
3819 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3820 }
3821
3822 static void pfkey_seq_stop(struct seq_file *f, void *v)
3823 __releases(rcu)
3824 {
3825 rcu_read_unlock();
3826 }
3827
3828 static const struct seq_operations pfkey_seq_ops = {
3829 .start = pfkey_seq_start,
3830 .next = pfkey_seq_next,
3831 .stop = pfkey_seq_stop,
3832 .show = pfkey_seq_show,
3833 };
3834
3835 static int pfkey_seq_open(struct inode *inode, struct file *file)
3836 {
3837 return seq_open_net(inode, file, &pfkey_seq_ops,
3838 sizeof(struct seq_net_private));
3839 }
3840
3841 static const struct file_operations pfkey_proc_ops = {
3842 .open = pfkey_seq_open,
3843 .read = seq_read,
3844 .llseek = seq_lseek,
3845 .release = seq_release_net,
3846 };
3847
3848 static int __net_init pfkey_init_proc(struct net *net)
3849 {
3850 struct proc_dir_entry *e;
3851
3852 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3853 if (e == NULL)
3854 return -ENOMEM;
3855
3856 return 0;
3857 }
3858
3859 static void __net_exit pfkey_exit_proc(struct net *net)
3860 {
3861 remove_proc_entry("pfkey", net->proc_net);
3862 }
3863 #else
3864 static inline int pfkey_init_proc(struct net *net)
3865 {
3866 return 0;
3867 }
3868
3869 static inline void pfkey_exit_proc(struct net *net)
3870 {
3871 }
3872 #endif
3873
3874 static struct xfrm_mgr pfkeyv2_mgr =
3875 {
3876 .id = "pfkeyv2",
3877 .notify = pfkey_send_notify,
3878 .acquire = pfkey_send_acquire,
3879 .compile_policy = pfkey_compile_policy,
3880 .new_mapping = pfkey_send_new_mapping,
3881 .notify_policy = pfkey_send_policy_notify,
3882 .migrate = pfkey_send_migrate,
3883 .is_alive = pfkey_is_alive,
3884 };
3885
3886 static int __net_init pfkey_net_init(struct net *net)
3887 {
3888 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3889 int rv;
3890
3891 INIT_HLIST_HEAD(&net_pfkey->table);
3892 atomic_set(&net_pfkey->socks_nr, 0);
3893
3894 rv = pfkey_init_proc(net);
3895
3896 return rv;
3897 }
3898
3899 static void __net_exit pfkey_net_exit(struct net *net)
3900 {
3901 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3902
3903 pfkey_exit_proc(net);
3904 BUG_ON(!hlist_empty(&net_pfkey->table));
3905 }
3906
3907 static struct pernet_operations pfkey_net_ops = {
3908 .init = pfkey_net_init,
3909 .exit = pfkey_net_exit,
3910 .id = &pfkey_net_id,
3911 .size = sizeof(struct netns_pfkey),
3912 };
3913
3914 static void __exit ipsec_pfkey_exit(void)
3915 {
3916 xfrm_unregister_km(&pfkeyv2_mgr);
3917 sock_unregister(PF_KEY);
3918 unregister_pernet_subsys(&pfkey_net_ops);
3919 proto_unregister(&key_proto);
3920 }
3921
3922 static int __init ipsec_pfkey_init(void)
3923 {
3924 int err = proto_register(&key_proto, 0);
3925
3926 if (err != 0)
3927 goto out;
3928
3929 err = register_pernet_subsys(&pfkey_net_ops);
3930 if (err != 0)
3931 goto out_unregister_key_proto;
3932 err = sock_register(&pfkey_family_ops);
3933 if (err != 0)
3934 goto out_unregister_pernet;
3935 err = xfrm_register_km(&pfkeyv2_mgr);
3936 if (err != 0)
3937 goto out_sock_unregister;
3938 out:
3939 return err;
3940
3941 out_sock_unregister:
3942 sock_unregister(PF_KEY);
3943 out_unregister_pernet:
3944 unregister_pernet_subsys(&pfkey_net_ops);
3945 out_unregister_key_proto:
3946 proto_unregister(&key_proto);
3947 goto out;
3948 }
3949
3950 module_init(ipsec_pfkey_init);
3951 module_exit(ipsec_pfkey_exit);
3952 MODULE_LICENSE("GPL");
3953 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux with added FPC-III support