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Merge commit '900cfa46191a7d87cf1891924cb90499287fd235'; branches 'timers/nohz',...
[mirror_ubuntu-artful-kernel.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <net/net_namespace.h>
30 #include <net/xfrm.h>
31
32 #include <net/sock.h>
33
34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
36
37
38 /* List of all pfkey sockets. */
39 static HLIST_HEAD(pfkey_table);
40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
41 static DEFINE_RWLOCK(pfkey_table_lock);
42 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
43
44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
45
46 struct pfkey_sock {
47 /* struct sock must be the first member of struct pfkey_sock */
48 struct sock sk;
49 int registered;
50 int promisc;
51
52 struct {
53 uint8_t msg_version;
54 uint32_t msg_pid;
55 int (*dump)(struct pfkey_sock *sk);
56 void (*done)(struct pfkey_sock *sk);
57 union {
58 struct xfrm_policy_walk policy;
59 struct xfrm_state_walk state;
60 } u;
61 } dump;
62 };
63
64 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
65 {
66 return (struct pfkey_sock *)sk;
67 }
68
69 static int pfkey_can_dump(struct sock *sk)
70 {
71 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
72 return 1;
73 return 0;
74 }
75
76 static int pfkey_do_dump(struct pfkey_sock *pfk)
77 {
78 int rc;
79
80 rc = pfk->dump.dump(pfk);
81 if (rc == -ENOBUFS)
82 return 0;
83
84 pfk->dump.done(pfk);
85 pfk->dump.dump = NULL;
86 pfk->dump.done = NULL;
87 return rc;
88 }
89
90 static void pfkey_sock_destruct(struct sock *sk)
91 {
92 skb_queue_purge(&sk->sk_receive_queue);
93
94 if (!sock_flag(sk, SOCK_DEAD)) {
95 printk("Attempt to release alive pfkey socket: %p\n", sk);
96 return;
97 }
98
99 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
100 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
101
102 atomic_dec(&pfkey_socks_nr);
103 }
104
105 static void pfkey_table_grab(void)
106 {
107 write_lock_bh(&pfkey_table_lock);
108
109 if (atomic_read(&pfkey_table_users)) {
110 DECLARE_WAITQUEUE(wait, current);
111
112 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
113 for(;;) {
114 set_current_state(TASK_UNINTERRUPTIBLE);
115 if (atomic_read(&pfkey_table_users) == 0)
116 break;
117 write_unlock_bh(&pfkey_table_lock);
118 schedule();
119 write_lock_bh(&pfkey_table_lock);
120 }
121
122 __set_current_state(TASK_RUNNING);
123 remove_wait_queue(&pfkey_table_wait, &wait);
124 }
125 }
126
127 static __inline__ void pfkey_table_ungrab(void)
128 {
129 write_unlock_bh(&pfkey_table_lock);
130 wake_up(&pfkey_table_wait);
131 }
132
133 static __inline__ void pfkey_lock_table(void)
134 {
135 /* read_lock() synchronizes us to pfkey_table_grab */
136
137 read_lock(&pfkey_table_lock);
138 atomic_inc(&pfkey_table_users);
139 read_unlock(&pfkey_table_lock);
140 }
141
142 static __inline__ void pfkey_unlock_table(void)
143 {
144 if (atomic_dec_and_test(&pfkey_table_users))
145 wake_up(&pfkey_table_wait);
146 }
147
148
149 static const struct proto_ops pfkey_ops;
150
151 static void pfkey_insert(struct sock *sk)
152 {
153 pfkey_table_grab();
154 sk_add_node(sk, &pfkey_table);
155 pfkey_table_ungrab();
156 }
157
158 static void pfkey_remove(struct sock *sk)
159 {
160 pfkey_table_grab();
161 sk_del_node_init(sk);
162 pfkey_table_ungrab();
163 }
164
165 static struct proto key_proto = {
166 .name = "KEY",
167 .owner = THIS_MODULE,
168 .obj_size = sizeof(struct pfkey_sock),
169 };
170
171 static int pfkey_create(struct net *net, struct socket *sock, int protocol)
172 {
173 struct sock *sk;
174 int err;
175
176 if (net != &init_net)
177 return -EAFNOSUPPORT;
178
179 if (!capable(CAP_NET_ADMIN))
180 return -EPERM;
181 if (sock->type != SOCK_RAW)
182 return -ESOCKTNOSUPPORT;
183 if (protocol != PF_KEY_V2)
184 return -EPROTONOSUPPORT;
185
186 err = -ENOMEM;
187 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
188 if (sk == NULL)
189 goto out;
190
191 sock->ops = &pfkey_ops;
192 sock_init_data(sock, sk);
193
194 sk->sk_family = PF_KEY;
195 sk->sk_destruct = pfkey_sock_destruct;
196
197 atomic_inc(&pfkey_socks_nr);
198
199 pfkey_insert(sk);
200
201 return 0;
202 out:
203 return err;
204 }
205
206 static int pfkey_release(struct socket *sock)
207 {
208 struct sock *sk = sock->sk;
209
210 if (!sk)
211 return 0;
212
213 pfkey_remove(sk);
214
215 sock_orphan(sk);
216 sock->sk = NULL;
217 skb_queue_purge(&sk->sk_write_queue);
218 sock_put(sk);
219
220 return 0;
221 }
222
223 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
224 gfp_t allocation, struct sock *sk)
225 {
226 int err = -ENOBUFS;
227
228 sock_hold(sk);
229 if (*skb2 == NULL) {
230 if (atomic_read(&skb->users) != 1) {
231 *skb2 = skb_clone(skb, allocation);
232 } else {
233 *skb2 = skb;
234 atomic_inc(&skb->users);
235 }
236 }
237 if (*skb2 != NULL) {
238 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
239 skb_orphan(*skb2);
240 skb_set_owner_r(*skb2, sk);
241 skb_queue_tail(&sk->sk_receive_queue, *skb2);
242 sk->sk_data_ready(sk, (*skb2)->len);
243 *skb2 = NULL;
244 err = 0;
245 }
246 }
247 sock_put(sk);
248 return err;
249 }
250
251 /* Send SKB to all pfkey sockets matching selected criteria. */
252 #define BROADCAST_ALL 0
253 #define BROADCAST_ONE 1
254 #define BROADCAST_REGISTERED 2
255 #define BROADCAST_PROMISC_ONLY 4
256 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
257 int broadcast_flags, struct sock *one_sk)
258 {
259 struct sock *sk;
260 struct hlist_node *node;
261 struct sk_buff *skb2 = NULL;
262 int err = -ESRCH;
263
264 /* XXX Do we need something like netlink_overrun? I think
265 * XXX PF_KEY socket apps will not mind current behavior.
266 */
267 if (!skb)
268 return -ENOMEM;
269
270 pfkey_lock_table();
271 sk_for_each(sk, node, &pfkey_table) {
272 struct pfkey_sock *pfk = pfkey_sk(sk);
273 int err2;
274
275 /* Yes, it means that if you are meant to receive this
276 * pfkey message you receive it twice as promiscuous
277 * socket.
278 */
279 if (pfk->promisc)
280 pfkey_broadcast_one(skb, &skb2, allocation, sk);
281
282 /* the exact target will be processed later */
283 if (sk == one_sk)
284 continue;
285 if (broadcast_flags != BROADCAST_ALL) {
286 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
287 continue;
288 if ((broadcast_flags & BROADCAST_REGISTERED) &&
289 !pfk->registered)
290 continue;
291 if (broadcast_flags & BROADCAST_ONE)
292 continue;
293 }
294
295 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
296
297 /* Error is cleare after succecful sending to at least one
298 * registered KM */
299 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
300 err = err2;
301 }
302 pfkey_unlock_table();
303
304 if (one_sk != NULL)
305 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
306
307 if (skb2)
308 kfree_skb(skb2);
309 kfree_skb(skb);
310 return err;
311 }
312
313 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
314 {
315 *new = *orig;
316 }
317
318 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
319 {
320 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
321 struct sadb_msg *hdr;
322
323 if (!skb)
324 return -ENOBUFS;
325
326 /* Woe be to the platform trying to support PFKEY yet
327 * having normal errnos outside the 1-255 range, inclusive.
328 */
329 err = -err;
330 if (err == ERESTARTSYS ||
331 err == ERESTARTNOHAND ||
332 err == ERESTARTNOINTR)
333 err = EINTR;
334 if (err >= 512)
335 err = EINVAL;
336 BUG_ON(err <= 0 || err >= 256);
337
338 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
339 pfkey_hdr_dup(hdr, orig);
340 hdr->sadb_msg_errno = (uint8_t) err;
341 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
342 sizeof(uint64_t));
343
344 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
345
346 return 0;
347 }
348
349 static u8 sadb_ext_min_len[] = {
350 [SADB_EXT_RESERVED] = (u8) 0,
351 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
352 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
353 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
354 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
355 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
356 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
357 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
358 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
359 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
360 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
361 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
362 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
363 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
364 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
365 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
366 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
367 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
368 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
369 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
370 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
371 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
372 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
373 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
374 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
375 };
376
377 /* Verify sadb_address_{len,prefixlen} against sa_family. */
378 static int verify_address_len(void *p)
379 {
380 struct sadb_address *sp = p;
381 struct sockaddr *addr = (struct sockaddr *)(sp + 1);
382 struct sockaddr_in *sin;
383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
384 struct sockaddr_in6 *sin6;
385 #endif
386 int len;
387
388 switch (addr->sa_family) {
389 case AF_INET:
390 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
391 if (sp->sadb_address_len != len ||
392 sp->sadb_address_prefixlen > 32)
393 return -EINVAL;
394 break;
395 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
396 case AF_INET6:
397 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
398 if (sp->sadb_address_len != len ||
399 sp->sadb_address_prefixlen > 128)
400 return -EINVAL;
401 break;
402 #endif
403 default:
404 /* It is user using kernel to keep track of security
405 * associations for another protocol, such as
406 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
407 * lengths.
408 *
409 * XXX Actually, association/policy database is not yet
410 * XXX able to cope with arbitrary sockaddr families.
411 * XXX When it can, remove this -EINVAL. -DaveM
412 */
413 return -EINVAL;
414 break;
415 }
416
417 return 0;
418 }
419
420 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
421 {
422 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
423 sec_ctx->sadb_x_ctx_len,
424 sizeof(uint64_t));
425 }
426
427 static inline int verify_sec_ctx_len(void *p)
428 {
429 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
430 int len = sec_ctx->sadb_x_ctx_len;
431
432 if (len > PAGE_SIZE)
433 return -EINVAL;
434
435 len = pfkey_sec_ctx_len(sec_ctx);
436
437 if (sec_ctx->sadb_x_sec_len != len)
438 return -EINVAL;
439
440 return 0;
441 }
442
443 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
444 {
445 struct xfrm_user_sec_ctx *uctx = NULL;
446 int ctx_size = sec_ctx->sadb_x_ctx_len;
447
448 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
449
450 if (!uctx)
451 return NULL;
452
453 uctx->len = pfkey_sec_ctx_len(sec_ctx);
454 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
455 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
456 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
457 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
458 memcpy(uctx + 1, sec_ctx + 1,
459 uctx->ctx_len);
460
461 return uctx;
462 }
463
464 static int present_and_same_family(struct sadb_address *src,
465 struct sadb_address *dst)
466 {
467 struct sockaddr *s_addr, *d_addr;
468
469 if (!src || !dst)
470 return 0;
471
472 s_addr = (struct sockaddr *)(src + 1);
473 d_addr = (struct sockaddr *)(dst + 1);
474 if (s_addr->sa_family != d_addr->sa_family)
475 return 0;
476 if (s_addr->sa_family != AF_INET
477 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
478 && s_addr->sa_family != AF_INET6
479 #endif
480 )
481 return 0;
482
483 return 1;
484 }
485
486 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
487 {
488 char *p = (char *) hdr;
489 int len = skb->len;
490
491 len -= sizeof(*hdr);
492 p += sizeof(*hdr);
493 while (len > 0) {
494 struct sadb_ext *ehdr = (struct sadb_ext *) p;
495 uint16_t ext_type;
496 int ext_len;
497
498 ext_len = ehdr->sadb_ext_len;
499 ext_len *= sizeof(uint64_t);
500 ext_type = ehdr->sadb_ext_type;
501 if (ext_len < sizeof(uint64_t) ||
502 ext_len > len ||
503 ext_type == SADB_EXT_RESERVED)
504 return -EINVAL;
505
506 if (ext_type <= SADB_EXT_MAX) {
507 int min = (int) sadb_ext_min_len[ext_type];
508 if (ext_len < min)
509 return -EINVAL;
510 if (ext_hdrs[ext_type-1] != NULL)
511 return -EINVAL;
512 if (ext_type == SADB_EXT_ADDRESS_SRC ||
513 ext_type == SADB_EXT_ADDRESS_DST ||
514 ext_type == SADB_EXT_ADDRESS_PROXY ||
515 ext_type == SADB_X_EXT_NAT_T_OA) {
516 if (verify_address_len(p))
517 return -EINVAL;
518 }
519 if (ext_type == SADB_X_EXT_SEC_CTX) {
520 if (verify_sec_ctx_len(p))
521 return -EINVAL;
522 }
523 ext_hdrs[ext_type-1] = p;
524 }
525 p += ext_len;
526 len -= ext_len;
527 }
528
529 return 0;
530 }
531
532 static uint16_t
533 pfkey_satype2proto(uint8_t satype)
534 {
535 switch (satype) {
536 case SADB_SATYPE_UNSPEC:
537 return IPSEC_PROTO_ANY;
538 case SADB_SATYPE_AH:
539 return IPPROTO_AH;
540 case SADB_SATYPE_ESP:
541 return IPPROTO_ESP;
542 case SADB_X_SATYPE_IPCOMP:
543 return IPPROTO_COMP;
544 break;
545 default:
546 return 0;
547 }
548 /* NOTREACHED */
549 }
550
551 static uint8_t
552 pfkey_proto2satype(uint16_t proto)
553 {
554 switch (proto) {
555 case IPPROTO_AH:
556 return SADB_SATYPE_AH;
557 case IPPROTO_ESP:
558 return SADB_SATYPE_ESP;
559 case IPPROTO_COMP:
560 return SADB_X_SATYPE_IPCOMP;
561 break;
562 default:
563 return 0;
564 }
565 /* NOTREACHED */
566 }
567
568 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
569 * say specifically 'just raw sockets' as we encode them as 255.
570 */
571
572 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
573 {
574 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
575 }
576
577 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
578 {
579 return (proto ? proto : IPSEC_PROTO_ANY);
580 }
581
582 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
583 xfrm_address_t *xaddr)
584 {
585 switch (((struct sockaddr*)(addr + 1))->sa_family) {
586 case AF_INET:
587 xaddr->a4 =
588 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
589 return AF_INET;
590 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
591 case AF_INET6:
592 memcpy(xaddr->a6,
593 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
594 sizeof(struct in6_addr));
595 return AF_INET6;
596 #endif
597 default:
598 return 0;
599 }
600 /* NOTREACHED */
601 }
602
603 static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
604 {
605 struct sadb_sa *sa;
606 struct sadb_address *addr;
607 uint16_t proto;
608 unsigned short family;
609 xfrm_address_t *xaddr;
610
611 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
612 if (sa == NULL)
613 return NULL;
614
615 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
616 if (proto == 0)
617 return NULL;
618
619 /* sadb_address_len should be checked by caller */
620 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
621 if (addr == NULL)
622 return NULL;
623
624 family = ((struct sockaddr *)(addr + 1))->sa_family;
625 switch (family) {
626 case AF_INET:
627 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
628 break;
629 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
630 case AF_INET6:
631 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
632 break;
633 #endif
634 default:
635 xaddr = NULL;
636 }
637
638 if (!xaddr)
639 return NULL;
640
641 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
642 }
643
644 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
645 static int
646 pfkey_sockaddr_size(sa_family_t family)
647 {
648 switch (family) {
649 case AF_INET:
650 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
651 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
652 case AF_INET6:
653 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
654 #endif
655 default:
656 return 0;
657 }
658 /* NOTREACHED */
659 }
660
661 static inline int pfkey_mode_from_xfrm(int mode)
662 {
663 switch(mode) {
664 case XFRM_MODE_TRANSPORT:
665 return IPSEC_MODE_TRANSPORT;
666 case XFRM_MODE_TUNNEL:
667 return IPSEC_MODE_TUNNEL;
668 case XFRM_MODE_BEET:
669 return IPSEC_MODE_BEET;
670 default:
671 return -1;
672 }
673 }
674
675 static inline int pfkey_mode_to_xfrm(int mode)
676 {
677 switch(mode) {
678 case IPSEC_MODE_ANY: /*XXX*/
679 case IPSEC_MODE_TRANSPORT:
680 return XFRM_MODE_TRANSPORT;
681 case IPSEC_MODE_TUNNEL:
682 return XFRM_MODE_TUNNEL;
683 case IPSEC_MODE_BEET:
684 return XFRM_MODE_BEET;
685 default:
686 return -1;
687 }
688 }
689
690 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
691 int add_keys, int hsc)
692 {
693 struct sk_buff *skb;
694 struct sadb_msg *hdr;
695 struct sadb_sa *sa;
696 struct sadb_lifetime *lifetime;
697 struct sadb_address *addr;
698 struct sadb_key *key;
699 struct sadb_x_sa2 *sa2;
700 struct sockaddr_in *sin;
701 struct sadb_x_sec_ctx *sec_ctx;
702 struct xfrm_sec_ctx *xfrm_ctx;
703 int ctx_size = 0;
704 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
705 struct sockaddr_in6 *sin6;
706 #endif
707 int size;
708 int auth_key_size = 0;
709 int encrypt_key_size = 0;
710 int sockaddr_size;
711 struct xfrm_encap_tmpl *natt = NULL;
712 int mode;
713
714 /* address family check */
715 sockaddr_size = pfkey_sockaddr_size(x->props.family);
716 if (!sockaddr_size)
717 return ERR_PTR(-EINVAL);
718
719 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
720 key(AE), (identity(SD),) (sensitivity)> */
721 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
722 sizeof(struct sadb_lifetime) +
723 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
724 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
725 sizeof(struct sadb_address)*2 +
726 sockaddr_size*2 +
727 sizeof(struct sadb_x_sa2);
728
729 if ((xfrm_ctx = x->security)) {
730 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
731 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
732 }
733
734 /* identity & sensitivity */
735
736 if ((x->props.family == AF_INET &&
737 x->sel.saddr.a4 != x->props.saddr.a4)
738 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
739 || (x->props.family == AF_INET6 &&
740 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
741 #endif
742 )
743 size += sizeof(struct sadb_address) + sockaddr_size;
744
745 if (add_keys) {
746 if (x->aalg && x->aalg->alg_key_len) {
747 auth_key_size =
748 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
749 size += sizeof(struct sadb_key) + auth_key_size;
750 }
751 if (x->ealg && x->ealg->alg_key_len) {
752 encrypt_key_size =
753 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
754 size += sizeof(struct sadb_key) + encrypt_key_size;
755 }
756 }
757 if (x->encap)
758 natt = x->encap;
759
760 if (natt && natt->encap_type) {
761 size += sizeof(struct sadb_x_nat_t_type);
762 size += sizeof(struct sadb_x_nat_t_port);
763 size += sizeof(struct sadb_x_nat_t_port);
764 }
765
766 skb = alloc_skb(size + 16, GFP_ATOMIC);
767 if (skb == NULL)
768 return ERR_PTR(-ENOBUFS);
769
770 /* call should fill header later */
771 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
772 memset(hdr, 0, size); /* XXX do we need this ? */
773 hdr->sadb_msg_len = size / sizeof(uint64_t);
774
775 /* sa */
776 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
777 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
778 sa->sadb_sa_exttype = SADB_EXT_SA;
779 sa->sadb_sa_spi = x->id.spi;
780 sa->sadb_sa_replay = x->props.replay_window;
781 switch (x->km.state) {
782 case XFRM_STATE_VALID:
783 sa->sadb_sa_state = x->km.dying ?
784 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
785 break;
786 case XFRM_STATE_ACQ:
787 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
788 break;
789 default:
790 sa->sadb_sa_state = SADB_SASTATE_DEAD;
791 break;
792 }
793 sa->sadb_sa_auth = 0;
794 if (x->aalg) {
795 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
796 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
797 }
798 sa->sadb_sa_encrypt = 0;
799 BUG_ON(x->ealg && x->calg);
800 if (x->ealg) {
801 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
802 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
803 }
804 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
805 if (x->calg) {
806 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
807 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
808 }
809
810 sa->sadb_sa_flags = 0;
811 if (x->props.flags & XFRM_STATE_NOECN)
812 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
813 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
814 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
815 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
816 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
817
818 /* hard time */
819 if (hsc & 2) {
820 lifetime = (struct sadb_lifetime *) skb_put(skb,
821 sizeof(struct sadb_lifetime));
822 lifetime->sadb_lifetime_len =
823 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
824 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
825 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
826 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
827 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
828 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
829 }
830 /* soft time */
831 if (hsc & 1) {
832 lifetime = (struct sadb_lifetime *) skb_put(skb,
833 sizeof(struct sadb_lifetime));
834 lifetime->sadb_lifetime_len =
835 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
836 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
837 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
838 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
839 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
840 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
841 }
842 /* current time */
843 lifetime = (struct sadb_lifetime *) skb_put(skb,
844 sizeof(struct sadb_lifetime));
845 lifetime->sadb_lifetime_len =
846 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
847 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
848 lifetime->sadb_lifetime_allocations = x->curlft.packets;
849 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
850 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
851 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
852 /* src address */
853 addr = (struct sadb_address*) skb_put(skb,
854 sizeof(struct sadb_address)+sockaddr_size);
855 addr->sadb_address_len =
856 (sizeof(struct sadb_address)+sockaddr_size)/
857 sizeof(uint64_t);
858 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
859 /* "if the ports are non-zero, then the sadb_address_proto field,
860 normally zero, MUST be filled in with the transport
861 protocol's number." - RFC2367 */
862 addr->sadb_address_proto = 0;
863 addr->sadb_address_reserved = 0;
864 if (x->props.family == AF_INET) {
865 addr->sadb_address_prefixlen = 32;
866
867 sin = (struct sockaddr_in *) (addr + 1);
868 sin->sin_family = AF_INET;
869 sin->sin_addr.s_addr = x->props.saddr.a4;
870 sin->sin_port = 0;
871 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
872 }
873 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
874 else if (x->props.family == AF_INET6) {
875 addr->sadb_address_prefixlen = 128;
876
877 sin6 = (struct sockaddr_in6 *) (addr + 1);
878 sin6->sin6_family = AF_INET6;
879 sin6->sin6_port = 0;
880 sin6->sin6_flowinfo = 0;
881 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
882 sizeof(struct in6_addr));
883 sin6->sin6_scope_id = 0;
884 }
885 #endif
886 else
887 BUG();
888
889 /* dst address */
890 addr = (struct sadb_address*) skb_put(skb,
891 sizeof(struct sadb_address)+sockaddr_size);
892 addr->sadb_address_len =
893 (sizeof(struct sadb_address)+sockaddr_size)/
894 sizeof(uint64_t);
895 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
896 addr->sadb_address_proto = 0;
897 addr->sadb_address_prefixlen = 32; /* XXX */
898 addr->sadb_address_reserved = 0;
899 if (x->props.family == AF_INET) {
900 sin = (struct sockaddr_in *) (addr + 1);
901 sin->sin_family = AF_INET;
902 sin->sin_addr.s_addr = x->id.daddr.a4;
903 sin->sin_port = 0;
904 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
905
906 if (x->sel.saddr.a4 != x->props.saddr.a4) {
907 addr = (struct sadb_address*) skb_put(skb,
908 sizeof(struct sadb_address)+sockaddr_size);
909 addr->sadb_address_len =
910 (sizeof(struct sadb_address)+sockaddr_size)/
911 sizeof(uint64_t);
912 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
913 addr->sadb_address_proto =
914 pfkey_proto_from_xfrm(x->sel.proto);
915 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
916 addr->sadb_address_reserved = 0;
917
918 sin = (struct sockaddr_in *) (addr + 1);
919 sin->sin_family = AF_INET;
920 sin->sin_addr.s_addr = x->sel.saddr.a4;
921 sin->sin_port = x->sel.sport;
922 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
923 }
924 }
925 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
926 else if (x->props.family == AF_INET6) {
927 addr->sadb_address_prefixlen = 128;
928
929 sin6 = (struct sockaddr_in6 *) (addr + 1);
930 sin6->sin6_family = AF_INET6;
931 sin6->sin6_port = 0;
932 sin6->sin6_flowinfo = 0;
933 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
934 sin6->sin6_scope_id = 0;
935
936 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
937 sizeof(struct in6_addr))) {
938 addr = (struct sadb_address *) skb_put(skb,
939 sizeof(struct sadb_address)+sockaddr_size);
940 addr->sadb_address_len =
941 (sizeof(struct sadb_address)+sockaddr_size)/
942 sizeof(uint64_t);
943 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
944 addr->sadb_address_proto =
945 pfkey_proto_from_xfrm(x->sel.proto);
946 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
947 addr->sadb_address_reserved = 0;
948
949 sin6 = (struct sockaddr_in6 *) (addr + 1);
950 sin6->sin6_family = AF_INET6;
951 sin6->sin6_port = x->sel.sport;
952 sin6->sin6_flowinfo = 0;
953 memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
954 sizeof(struct in6_addr));
955 sin6->sin6_scope_id = 0;
956 }
957 }
958 #endif
959 else
960 BUG();
961
962 /* auth key */
963 if (add_keys && auth_key_size) {
964 key = (struct sadb_key *) skb_put(skb,
965 sizeof(struct sadb_key)+auth_key_size);
966 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
967 sizeof(uint64_t);
968 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
969 key->sadb_key_bits = x->aalg->alg_key_len;
970 key->sadb_key_reserved = 0;
971 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
972 }
973 /* encrypt key */
974 if (add_keys && encrypt_key_size) {
975 key = (struct sadb_key *) skb_put(skb,
976 sizeof(struct sadb_key)+encrypt_key_size);
977 key->sadb_key_len = (sizeof(struct sadb_key) +
978 encrypt_key_size) / sizeof(uint64_t);
979 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
980 key->sadb_key_bits = x->ealg->alg_key_len;
981 key->sadb_key_reserved = 0;
982 memcpy(key + 1, x->ealg->alg_key,
983 (x->ealg->alg_key_len+7)/8);
984 }
985
986 /* sa */
987 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
988 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
989 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
990 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
991 kfree_skb(skb);
992 return ERR_PTR(-EINVAL);
993 }
994 sa2->sadb_x_sa2_mode = mode;
995 sa2->sadb_x_sa2_reserved1 = 0;
996 sa2->sadb_x_sa2_reserved2 = 0;
997 sa2->sadb_x_sa2_sequence = 0;
998 sa2->sadb_x_sa2_reqid = x->props.reqid;
999
1000 if (natt && natt->encap_type) {
1001 struct sadb_x_nat_t_type *n_type;
1002 struct sadb_x_nat_t_port *n_port;
1003
1004 /* type */
1005 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1006 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1007 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1008 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1009 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1010 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1011 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1012
1013 /* source port */
1014 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1015 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1016 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1017 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1018 n_port->sadb_x_nat_t_port_reserved = 0;
1019
1020 /* dest port */
1021 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1022 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1023 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1024 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1025 n_port->sadb_x_nat_t_port_reserved = 0;
1026 }
1027
1028 /* security context */
1029 if (xfrm_ctx) {
1030 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1031 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1032 sec_ctx->sadb_x_sec_len =
1033 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1034 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1035 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1036 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1037 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1038 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1039 xfrm_ctx->ctx_len);
1040 }
1041
1042 return skb;
1043 }
1044
1045
1046 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1047 {
1048 struct sk_buff *skb;
1049
1050 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1051
1052 return skb;
1053 }
1054
1055 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1056 int hsc)
1057 {
1058 return __pfkey_xfrm_state2msg(x, 0, hsc);
1059 }
1060
1061 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
1062 void **ext_hdrs)
1063 {
1064 struct xfrm_state *x;
1065 struct sadb_lifetime *lifetime;
1066 struct sadb_sa *sa;
1067 struct sadb_key *key;
1068 struct sadb_x_sec_ctx *sec_ctx;
1069 uint16_t proto;
1070 int err;
1071
1072
1073 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1074 if (!sa ||
1075 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1076 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1077 return ERR_PTR(-EINVAL);
1078 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1079 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1080 return ERR_PTR(-EINVAL);
1081 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1082 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1083 return ERR_PTR(-EINVAL);
1084 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1085 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1086 return ERR_PTR(-EINVAL);
1087
1088 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1089 if (proto == 0)
1090 return ERR_PTR(-EINVAL);
1091
1092 /* default error is no buffer space */
1093 err = -ENOBUFS;
1094
1095 /* RFC2367:
1096
1097 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1098 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1099 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1100 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1101 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1102 not true.
1103
1104 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1105 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1106 */
1107 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1108 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1109 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1110 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1111 return ERR_PTR(-EINVAL);
1112 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1113 if (key != NULL &&
1114 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1115 ((key->sadb_key_bits+7) / 8 == 0 ||
1116 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1117 return ERR_PTR(-EINVAL);
1118 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1119 if (key != NULL &&
1120 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1121 ((key->sadb_key_bits+7) / 8 == 0 ||
1122 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1123 return ERR_PTR(-EINVAL);
1124
1125 x = xfrm_state_alloc();
1126 if (x == NULL)
1127 return ERR_PTR(-ENOBUFS);
1128
1129 x->id.proto = proto;
1130 x->id.spi = sa->sadb_sa_spi;
1131 x->props.replay_window = sa->sadb_sa_replay;
1132 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1133 x->props.flags |= XFRM_STATE_NOECN;
1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1135 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1137 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1138
1139 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1140 if (lifetime != NULL) {
1141 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1142 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1143 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1144 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1145 }
1146 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1147 if (lifetime != NULL) {
1148 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1149 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1150 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1151 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1152 }
1153
1154 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1155 if (sec_ctx != NULL) {
1156 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1157
1158 if (!uctx)
1159 goto out;
1160
1161 err = security_xfrm_state_alloc(x, uctx);
1162 kfree(uctx);
1163
1164 if (err)
1165 goto out;
1166 }
1167
1168 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1169 if (sa->sadb_sa_auth) {
1170 int keysize = 0;
1171 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1172 if (!a) {
1173 err = -ENOSYS;
1174 goto out;
1175 }
1176 if (key)
1177 keysize = (key->sadb_key_bits + 7) / 8;
1178 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1179 if (!x->aalg)
1180 goto out;
1181 strcpy(x->aalg->alg_name, a->name);
1182 x->aalg->alg_key_len = 0;
1183 if (key) {
1184 x->aalg->alg_key_len = key->sadb_key_bits;
1185 memcpy(x->aalg->alg_key, key+1, keysize);
1186 }
1187 x->props.aalgo = sa->sadb_sa_auth;
1188 /* x->algo.flags = sa->sadb_sa_flags; */
1189 }
1190 if (sa->sadb_sa_encrypt) {
1191 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1192 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1193 if (!a) {
1194 err = -ENOSYS;
1195 goto out;
1196 }
1197 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1198 if (!x->calg)
1199 goto out;
1200 strcpy(x->calg->alg_name, a->name);
1201 x->props.calgo = sa->sadb_sa_encrypt;
1202 } else {
1203 int keysize = 0;
1204 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1205 if (!a) {
1206 err = -ENOSYS;
1207 goto out;
1208 }
1209 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1210 if (key)
1211 keysize = (key->sadb_key_bits + 7) / 8;
1212 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1213 if (!x->ealg)
1214 goto out;
1215 strcpy(x->ealg->alg_name, a->name);
1216 x->ealg->alg_key_len = 0;
1217 if (key) {
1218 x->ealg->alg_key_len = key->sadb_key_bits;
1219 memcpy(x->ealg->alg_key, key+1, keysize);
1220 }
1221 x->props.ealgo = sa->sadb_sa_encrypt;
1222 }
1223 }
1224 /* x->algo.flags = sa->sadb_sa_flags; */
1225
1226 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1227 &x->props.saddr);
1228 if (!x->props.family) {
1229 err = -EAFNOSUPPORT;
1230 goto out;
1231 }
1232 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1233 &x->id.daddr);
1234
1235 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1236 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1237 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1238 if (mode < 0) {
1239 err = -EINVAL;
1240 goto out;
1241 }
1242 x->props.mode = mode;
1243 x->props.reqid = sa2->sadb_x_sa2_reqid;
1244 }
1245
1246 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1247 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1248
1249 /* Nobody uses this, but we try. */
1250 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1251 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1252 }
1253
1254 if (!x->sel.family)
1255 x->sel.family = x->props.family;
1256
1257 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1258 struct sadb_x_nat_t_type* n_type;
1259 struct xfrm_encap_tmpl *natt;
1260
1261 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1262 if (!x->encap)
1263 goto out;
1264
1265 natt = x->encap;
1266 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1267 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1268
1269 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1270 struct sadb_x_nat_t_port* n_port =
1271 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1272 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1273 }
1274 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1275 struct sadb_x_nat_t_port* n_port =
1276 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1277 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1278 }
1279 }
1280
1281 err = xfrm_init_state(x);
1282 if (err)
1283 goto out;
1284
1285 x->km.seq = hdr->sadb_msg_seq;
1286 return x;
1287
1288 out:
1289 x->km.state = XFRM_STATE_DEAD;
1290 xfrm_state_put(x);
1291 return ERR_PTR(err);
1292 }
1293
1294 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1295 {
1296 return -EOPNOTSUPP;
1297 }
1298
1299 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1300 {
1301 struct sk_buff *resp_skb;
1302 struct sadb_x_sa2 *sa2;
1303 struct sadb_address *saddr, *daddr;
1304 struct sadb_msg *out_hdr;
1305 struct sadb_spirange *range;
1306 struct xfrm_state *x = NULL;
1307 int mode;
1308 int err;
1309 u32 min_spi, max_spi;
1310 u32 reqid;
1311 u8 proto;
1312 unsigned short family;
1313 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1314
1315 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1316 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1317 return -EINVAL;
1318
1319 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1320 if (proto == 0)
1321 return -EINVAL;
1322
1323 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1324 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1325 if (mode < 0)
1326 return -EINVAL;
1327 reqid = sa2->sadb_x_sa2_reqid;
1328 } else {
1329 mode = 0;
1330 reqid = 0;
1331 }
1332
1333 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1334 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1335
1336 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1337 switch (family) {
1338 case AF_INET:
1339 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1340 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1341 break;
1342 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1343 case AF_INET6:
1344 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1345 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1346 break;
1347 #endif
1348 }
1349
1350 if (hdr->sadb_msg_seq) {
1351 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1352 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1353 xfrm_state_put(x);
1354 x = NULL;
1355 }
1356 }
1357
1358 if (!x)
1359 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1360
1361 if (x == NULL)
1362 return -ENOENT;
1363
1364 min_spi = 0x100;
1365 max_spi = 0x0fffffff;
1366
1367 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1368 if (range) {
1369 min_spi = range->sadb_spirange_min;
1370 max_spi = range->sadb_spirange_max;
1371 }
1372
1373 err = xfrm_alloc_spi(x, min_spi, max_spi);
1374 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1375
1376 if (IS_ERR(resp_skb)) {
1377 xfrm_state_put(x);
1378 return PTR_ERR(resp_skb);
1379 }
1380
1381 out_hdr = (struct sadb_msg *) resp_skb->data;
1382 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1383 out_hdr->sadb_msg_type = SADB_GETSPI;
1384 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1385 out_hdr->sadb_msg_errno = 0;
1386 out_hdr->sadb_msg_reserved = 0;
1387 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1388 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1389
1390 xfrm_state_put(x);
1391
1392 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1393
1394 return 0;
1395 }
1396
1397 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1398 {
1399 struct xfrm_state *x;
1400
1401 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1402 return -EOPNOTSUPP;
1403
1404 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1405 return 0;
1406
1407 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1408 if (x == NULL)
1409 return 0;
1410
1411 spin_lock_bh(&x->lock);
1412 if (x->km.state == XFRM_STATE_ACQ) {
1413 x->km.state = XFRM_STATE_ERROR;
1414 wake_up(&km_waitq);
1415 }
1416 spin_unlock_bh(&x->lock);
1417 xfrm_state_put(x);
1418 return 0;
1419 }
1420
1421 static inline int event2poltype(int event)
1422 {
1423 switch (event) {
1424 case XFRM_MSG_DELPOLICY:
1425 return SADB_X_SPDDELETE;
1426 case XFRM_MSG_NEWPOLICY:
1427 return SADB_X_SPDADD;
1428 case XFRM_MSG_UPDPOLICY:
1429 return SADB_X_SPDUPDATE;
1430 case XFRM_MSG_POLEXPIRE:
1431 // return SADB_X_SPDEXPIRE;
1432 default:
1433 printk("pfkey: Unknown policy event %d\n", event);
1434 break;
1435 }
1436
1437 return 0;
1438 }
1439
1440 static inline int event2keytype(int event)
1441 {
1442 switch (event) {
1443 case XFRM_MSG_DELSA:
1444 return SADB_DELETE;
1445 case XFRM_MSG_NEWSA:
1446 return SADB_ADD;
1447 case XFRM_MSG_UPDSA:
1448 return SADB_UPDATE;
1449 case XFRM_MSG_EXPIRE:
1450 return SADB_EXPIRE;
1451 default:
1452 printk("pfkey: Unknown SA event %d\n", event);
1453 break;
1454 }
1455
1456 return 0;
1457 }
1458
1459 /* ADD/UPD/DEL */
1460 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1461 {
1462 struct sk_buff *skb;
1463 struct sadb_msg *hdr;
1464
1465 skb = pfkey_xfrm_state2msg(x);
1466
1467 if (IS_ERR(skb))
1468 return PTR_ERR(skb);
1469
1470 hdr = (struct sadb_msg *) skb->data;
1471 hdr->sadb_msg_version = PF_KEY_V2;
1472 hdr->sadb_msg_type = event2keytype(c->event);
1473 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1474 hdr->sadb_msg_errno = 0;
1475 hdr->sadb_msg_reserved = 0;
1476 hdr->sadb_msg_seq = c->seq;
1477 hdr->sadb_msg_pid = c->pid;
1478
1479 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1480
1481 return 0;
1482 }
1483
1484 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1485 {
1486 struct xfrm_state *x;
1487 int err;
1488 struct km_event c;
1489
1490 x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1491 if (IS_ERR(x))
1492 return PTR_ERR(x);
1493
1494 xfrm_state_hold(x);
1495 if (hdr->sadb_msg_type == SADB_ADD)
1496 err = xfrm_state_add(x);
1497 else
1498 err = xfrm_state_update(x);
1499
1500 xfrm_audit_state_add(x, err ? 0 : 1,
1501 audit_get_loginuid(current),
1502 audit_get_sessionid(current), 0);
1503
1504 if (err < 0) {
1505 x->km.state = XFRM_STATE_DEAD;
1506 __xfrm_state_put(x);
1507 goto out;
1508 }
1509
1510 if (hdr->sadb_msg_type == SADB_ADD)
1511 c.event = XFRM_MSG_NEWSA;
1512 else
1513 c.event = XFRM_MSG_UPDSA;
1514 c.seq = hdr->sadb_msg_seq;
1515 c.pid = hdr->sadb_msg_pid;
1516 km_state_notify(x, &c);
1517 out:
1518 xfrm_state_put(x);
1519 return err;
1520 }
1521
1522 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1523 {
1524 struct xfrm_state *x;
1525 struct km_event c;
1526 int err;
1527
1528 if (!ext_hdrs[SADB_EXT_SA-1] ||
1529 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1530 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1531 return -EINVAL;
1532
1533 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1534 if (x == NULL)
1535 return -ESRCH;
1536
1537 if ((err = security_xfrm_state_delete(x)))
1538 goto out;
1539
1540 if (xfrm_state_kern(x)) {
1541 err = -EPERM;
1542 goto out;
1543 }
1544
1545 err = xfrm_state_delete(x);
1546
1547 if (err < 0)
1548 goto out;
1549
1550 c.seq = hdr->sadb_msg_seq;
1551 c.pid = hdr->sadb_msg_pid;
1552 c.event = XFRM_MSG_DELSA;
1553 km_state_notify(x, &c);
1554 out:
1555 xfrm_audit_state_delete(x, err ? 0 : 1,
1556 audit_get_loginuid(current),
1557 audit_get_sessionid(current), 0);
1558 xfrm_state_put(x);
1559
1560 return err;
1561 }
1562
1563 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1564 {
1565 __u8 proto;
1566 struct sk_buff *out_skb;
1567 struct sadb_msg *out_hdr;
1568 struct xfrm_state *x;
1569
1570 if (!ext_hdrs[SADB_EXT_SA-1] ||
1571 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1572 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1573 return -EINVAL;
1574
1575 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1576 if (x == NULL)
1577 return -ESRCH;
1578
1579 out_skb = pfkey_xfrm_state2msg(x);
1580 proto = x->id.proto;
1581 xfrm_state_put(x);
1582 if (IS_ERR(out_skb))
1583 return PTR_ERR(out_skb);
1584
1585 out_hdr = (struct sadb_msg *) out_skb->data;
1586 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1587 out_hdr->sadb_msg_type = SADB_GET;
1588 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1589 out_hdr->sadb_msg_errno = 0;
1590 out_hdr->sadb_msg_reserved = 0;
1591 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1592 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1593 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1594
1595 return 0;
1596 }
1597
1598 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1599 gfp_t allocation)
1600 {
1601 struct sk_buff *skb;
1602 struct sadb_msg *hdr;
1603 int len, auth_len, enc_len, i;
1604
1605 auth_len = xfrm_count_auth_supported();
1606 if (auth_len) {
1607 auth_len *= sizeof(struct sadb_alg);
1608 auth_len += sizeof(struct sadb_supported);
1609 }
1610
1611 enc_len = xfrm_count_enc_supported();
1612 if (enc_len) {
1613 enc_len *= sizeof(struct sadb_alg);
1614 enc_len += sizeof(struct sadb_supported);
1615 }
1616
1617 len = enc_len + auth_len + sizeof(struct sadb_msg);
1618
1619 skb = alloc_skb(len + 16, allocation);
1620 if (!skb)
1621 goto out_put_algs;
1622
1623 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1624 pfkey_hdr_dup(hdr, orig);
1625 hdr->sadb_msg_errno = 0;
1626 hdr->sadb_msg_len = len / sizeof(uint64_t);
1627
1628 if (auth_len) {
1629 struct sadb_supported *sp;
1630 struct sadb_alg *ap;
1631
1632 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1633 ap = (struct sadb_alg *) (sp + 1);
1634
1635 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1636 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1637
1638 for (i = 0; ; i++) {
1639 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1640 if (!aalg)
1641 break;
1642 if (aalg->available)
1643 *ap++ = aalg->desc;
1644 }
1645 }
1646
1647 if (enc_len) {
1648 struct sadb_supported *sp;
1649 struct sadb_alg *ap;
1650
1651 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1652 ap = (struct sadb_alg *) (sp + 1);
1653
1654 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1655 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1656
1657 for (i = 0; ; i++) {
1658 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1659 if (!ealg)
1660 break;
1661 if (ealg->available)
1662 *ap++ = ealg->desc;
1663 }
1664 }
1665
1666 out_put_algs:
1667 return skb;
1668 }
1669
1670 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1671 {
1672 struct pfkey_sock *pfk = pfkey_sk(sk);
1673 struct sk_buff *supp_skb;
1674
1675 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1676 return -EINVAL;
1677
1678 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1679 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1680 return -EEXIST;
1681 pfk->registered |= (1<<hdr->sadb_msg_satype);
1682 }
1683
1684 xfrm_probe_algs();
1685
1686 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1687 if (!supp_skb) {
1688 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1689 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1690
1691 return -ENOBUFS;
1692 }
1693
1694 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1695
1696 return 0;
1697 }
1698
1699 static int key_notify_sa_flush(struct km_event *c)
1700 {
1701 struct sk_buff *skb;
1702 struct sadb_msg *hdr;
1703
1704 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1705 if (!skb)
1706 return -ENOBUFS;
1707 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1708 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1709 hdr->sadb_msg_type = SADB_FLUSH;
1710 hdr->sadb_msg_seq = c->seq;
1711 hdr->sadb_msg_pid = c->pid;
1712 hdr->sadb_msg_version = PF_KEY_V2;
1713 hdr->sadb_msg_errno = (uint8_t) 0;
1714 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1715
1716 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1717
1718 return 0;
1719 }
1720
1721 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1722 {
1723 unsigned proto;
1724 struct km_event c;
1725 struct xfrm_audit audit_info;
1726 int err;
1727
1728 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729 if (proto == 0)
1730 return -EINVAL;
1731
1732 audit_info.loginuid = audit_get_loginuid(current);
1733 audit_info.sessionid = audit_get_sessionid(current);
1734 audit_info.secid = 0;
1735 err = xfrm_state_flush(proto, &audit_info);
1736 if (err)
1737 return err;
1738 c.data.proto = proto;
1739 c.seq = hdr->sadb_msg_seq;
1740 c.pid = hdr->sadb_msg_pid;
1741 c.event = XFRM_MSG_FLUSHSA;
1742 km_state_notify(NULL, &c);
1743
1744 return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749 struct pfkey_sock *pfk = ptr;
1750 struct sk_buff *out_skb;
1751 struct sadb_msg *out_hdr;
1752
1753 if (!pfkey_can_dump(&pfk->sk))
1754 return -ENOBUFS;
1755
1756 out_skb = pfkey_xfrm_state2msg(x);
1757 if (IS_ERR(out_skb))
1758 return PTR_ERR(out_skb);
1759
1760 out_hdr = (struct sadb_msg *) out_skb->data;
1761 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762 out_hdr->sadb_msg_type = SADB_DUMP;
1763 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764 out_hdr->sadb_msg_errno = 0;
1765 out_hdr->sadb_msg_reserved = 0;
1766 out_hdr->sadb_msg_seq = count;
1767 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1768 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
1769 return 0;
1770 }
1771
1772 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1773 {
1774 return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
1775 }
1776
1777 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1778 {
1779 xfrm_state_walk_done(&pfk->dump.u.state);
1780 }
1781
1782 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1783 {
1784 u8 proto;
1785 struct pfkey_sock *pfk = pfkey_sk(sk);
1786
1787 if (pfk->dump.dump != NULL)
1788 return -EBUSY;
1789
1790 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1791 if (proto == 0)
1792 return -EINVAL;
1793
1794 pfk->dump.msg_version = hdr->sadb_msg_version;
1795 pfk->dump.msg_pid = hdr->sadb_msg_pid;
1796 pfk->dump.dump = pfkey_dump_sa;
1797 pfk->dump.done = pfkey_dump_sa_done;
1798 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1799
1800 return pfkey_do_dump(pfk);
1801 }
1802
1803 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1804 {
1805 struct pfkey_sock *pfk = pfkey_sk(sk);
1806 int satype = hdr->sadb_msg_satype;
1807
1808 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1809 /* XXX we mangle packet... */
1810 hdr->sadb_msg_errno = 0;
1811 if (satype != 0 && satype != 1)
1812 return -EINVAL;
1813 pfk->promisc = satype;
1814 }
1815 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1816 return 0;
1817 }
1818
1819 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1820 {
1821 int i;
1822 u32 reqid = *(u32*)ptr;
1823
1824 for (i=0; i<xp->xfrm_nr; i++) {
1825 if (xp->xfrm_vec[i].reqid == reqid)
1826 return -EEXIST;
1827 }
1828 return 0;
1829 }
1830
1831 static u32 gen_reqid(void)
1832 {
1833 struct xfrm_policy_walk walk;
1834 u32 start;
1835 int rc;
1836 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1837
1838 start = reqid;
1839 do {
1840 ++reqid;
1841 if (reqid == 0)
1842 reqid = IPSEC_MANUAL_REQID_MAX+1;
1843 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1844 rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
1845 xfrm_policy_walk_done(&walk);
1846 if (rc != -EEXIST)
1847 return reqid;
1848 } while (reqid != start);
1849 return 0;
1850 }
1851
1852 static int
1853 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1854 {
1855 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1856 struct sockaddr_in *sin;
1857 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1858 struct sockaddr_in6 *sin6;
1859 #endif
1860 int mode;
1861
1862 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1863 return -ELOOP;
1864
1865 if (rq->sadb_x_ipsecrequest_mode == 0)
1866 return -EINVAL;
1867
1868 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1869 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1870 return -EINVAL;
1871 t->mode = mode;
1872 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1873 t->optional = 1;
1874 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1875 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1876 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1877 t->reqid = 0;
1878 if (!t->reqid && !(t->reqid = gen_reqid()))
1879 return -ENOBUFS;
1880 }
1881
1882 /* addresses present only in tunnel mode */
1883 if (t->mode == XFRM_MODE_TUNNEL) {
1884 struct sockaddr *sa;
1885 sa = (struct sockaddr *)(rq+1);
1886 switch(sa->sa_family) {
1887 case AF_INET:
1888 sin = (struct sockaddr_in*)sa;
1889 t->saddr.a4 = sin->sin_addr.s_addr;
1890 sin++;
1891 if (sin->sin_family != AF_INET)
1892 return -EINVAL;
1893 t->id.daddr.a4 = sin->sin_addr.s_addr;
1894 break;
1895 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1896 case AF_INET6:
1897 sin6 = (struct sockaddr_in6*)sa;
1898 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1899 sin6++;
1900 if (sin6->sin6_family != AF_INET6)
1901 return -EINVAL;
1902 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1903 break;
1904 #endif
1905 default:
1906 return -EINVAL;
1907 }
1908 t->encap_family = sa->sa_family;
1909 } else
1910 t->encap_family = xp->family;
1911
1912 /* No way to set this via kame pfkey */
1913 t->allalgs = 1;
1914 xp->xfrm_nr++;
1915 return 0;
1916 }
1917
1918 static int
1919 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1920 {
1921 int err;
1922 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1923 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1924
1925 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1926 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1927 return err;
1928 len -= rq->sadb_x_ipsecrequest_len;
1929 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1930 }
1931 return 0;
1932 }
1933
1934 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1935 {
1936 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1937
1938 if (xfrm_ctx) {
1939 int len = sizeof(struct sadb_x_sec_ctx);
1940 len += xfrm_ctx->ctx_len;
1941 return PFKEY_ALIGN8(len);
1942 }
1943 return 0;
1944 }
1945
1946 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1947 {
1948 struct xfrm_tmpl *t;
1949 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1950 int socklen = 0;
1951 int i;
1952
1953 for (i=0; i<xp->xfrm_nr; i++) {
1954 t = xp->xfrm_vec + i;
1955 socklen += (t->encap_family == AF_INET ?
1956 sizeof(struct sockaddr_in) :
1957 sizeof(struct sockaddr_in6));
1958 }
1959
1960 return sizeof(struct sadb_msg) +
1961 (sizeof(struct sadb_lifetime) * 3) +
1962 (sizeof(struct sadb_address) * 2) +
1963 (sockaddr_size * 2) +
1964 sizeof(struct sadb_x_policy) +
1965 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1966 (socklen * 2) +
1967 pfkey_xfrm_policy2sec_ctx_size(xp);
1968 }
1969
1970 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1971 {
1972 struct sk_buff *skb;
1973 int size;
1974
1975 size = pfkey_xfrm_policy2msg_size(xp);
1976
1977 skb = alloc_skb(size + 16, GFP_ATOMIC);
1978 if (skb == NULL)
1979 return ERR_PTR(-ENOBUFS);
1980
1981 return skb;
1982 }
1983
1984 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1985 {
1986 struct sadb_msg *hdr;
1987 struct sadb_address *addr;
1988 struct sadb_lifetime *lifetime;
1989 struct sadb_x_policy *pol;
1990 struct sockaddr_in *sin;
1991 struct sadb_x_sec_ctx *sec_ctx;
1992 struct xfrm_sec_ctx *xfrm_ctx;
1993 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1994 struct sockaddr_in6 *sin6;
1995 #endif
1996 int i;
1997 int size;
1998 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1999 int socklen = (xp->family == AF_INET ?
2000 sizeof(struct sockaddr_in) :
2001 sizeof(struct sockaddr_in6));
2002
2003 size = pfkey_xfrm_policy2msg_size(xp);
2004
2005 /* call should fill header later */
2006 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2007 memset(hdr, 0, size); /* XXX do we need this ? */
2008
2009 /* src address */
2010 addr = (struct sadb_address*) skb_put(skb,
2011 sizeof(struct sadb_address)+sockaddr_size);
2012 addr->sadb_address_len =
2013 (sizeof(struct sadb_address)+sockaddr_size)/
2014 sizeof(uint64_t);
2015 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2016 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2017 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2018 addr->sadb_address_reserved = 0;
2019 /* src address */
2020 if (xp->family == AF_INET) {
2021 sin = (struct sockaddr_in *) (addr + 1);
2022 sin->sin_family = AF_INET;
2023 sin->sin_addr.s_addr = xp->selector.saddr.a4;
2024 sin->sin_port = xp->selector.sport;
2025 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2026 }
2027 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2028 else if (xp->family == AF_INET6) {
2029 sin6 = (struct sockaddr_in6 *) (addr + 1);
2030 sin6->sin6_family = AF_INET6;
2031 sin6->sin6_port = xp->selector.sport;
2032 sin6->sin6_flowinfo = 0;
2033 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
2034 sizeof(struct in6_addr));
2035 sin6->sin6_scope_id = 0;
2036 }
2037 #endif
2038 else
2039 BUG();
2040
2041 /* dst address */
2042 addr = (struct sadb_address*) skb_put(skb,
2043 sizeof(struct sadb_address)+sockaddr_size);
2044 addr->sadb_address_len =
2045 (sizeof(struct sadb_address)+sockaddr_size)/
2046 sizeof(uint64_t);
2047 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2048 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2049 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2050 addr->sadb_address_reserved = 0;
2051 if (xp->family == AF_INET) {
2052 sin = (struct sockaddr_in *) (addr + 1);
2053 sin->sin_family = AF_INET;
2054 sin->sin_addr.s_addr = xp->selector.daddr.a4;
2055 sin->sin_port = xp->selector.dport;
2056 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2057 }
2058 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2059 else if (xp->family == AF_INET6) {
2060 sin6 = (struct sockaddr_in6 *) (addr + 1);
2061 sin6->sin6_family = AF_INET6;
2062 sin6->sin6_port = xp->selector.dport;
2063 sin6->sin6_flowinfo = 0;
2064 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
2065 sizeof(struct in6_addr));
2066 sin6->sin6_scope_id = 0;
2067 }
2068 #endif
2069 else
2070 BUG();
2071
2072 /* hard time */
2073 lifetime = (struct sadb_lifetime *) skb_put(skb,
2074 sizeof(struct sadb_lifetime));
2075 lifetime->sadb_lifetime_len =
2076 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2077 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2078 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2079 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2080 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2081 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2082 /* soft time */
2083 lifetime = (struct sadb_lifetime *) skb_put(skb,
2084 sizeof(struct sadb_lifetime));
2085 lifetime->sadb_lifetime_len =
2086 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2087 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2088 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2089 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2090 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2091 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2092 /* current time */
2093 lifetime = (struct sadb_lifetime *) skb_put(skb,
2094 sizeof(struct sadb_lifetime));
2095 lifetime->sadb_lifetime_len =
2096 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2097 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2098 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2099 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2100 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2101 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2102
2103 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2104 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2105 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2106 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2107 if (xp->action == XFRM_POLICY_ALLOW) {
2108 if (xp->xfrm_nr)
2109 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2110 else
2111 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2112 }
2113 pol->sadb_x_policy_dir = dir+1;
2114 pol->sadb_x_policy_id = xp->index;
2115 pol->sadb_x_policy_priority = xp->priority;
2116
2117 for (i=0; i<xp->xfrm_nr; i++) {
2118 struct sadb_x_ipsecrequest *rq;
2119 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2120 int req_size;
2121 int mode;
2122
2123 req_size = sizeof(struct sadb_x_ipsecrequest);
2124 if (t->mode == XFRM_MODE_TUNNEL)
2125 req_size += ((t->encap_family == AF_INET ?
2126 sizeof(struct sockaddr_in) :
2127 sizeof(struct sockaddr_in6)) * 2);
2128 else
2129 size -= 2*socklen;
2130 rq = (void*)skb_put(skb, req_size);
2131 pol->sadb_x_policy_len += req_size/8;
2132 memset(rq, 0, sizeof(*rq));
2133 rq->sadb_x_ipsecrequest_len = req_size;
2134 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2135 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2136 return -EINVAL;
2137 rq->sadb_x_ipsecrequest_mode = mode;
2138 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2139 if (t->reqid)
2140 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2141 if (t->optional)
2142 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2143 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2144 if (t->mode == XFRM_MODE_TUNNEL) {
2145 switch (t->encap_family) {
2146 case AF_INET:
2147 sin = (void*)(rq+1);
2148 sin->sin_family = AF_INET;
2149 sin->sin_addr.s_addr = t->saddr.a4;
2150 sin->sin_port = 0;
2151 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2152 sin++;
2153 sin->sin_family = AF_INET;
2154 sin->sin_addr.s_addr = t->id.daddr.a4;
2155 sin->sin_port = 0;
2156 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2157 break;
2158 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2159 case AF_INET6:
2160 sin6 = (void*)(rq+1);
2161 sin6->sin6_family = AF_INET6;
2162 sin6->sin6_port = 0;
2163 sin6->sin6_flowinfo = 0;
2164 memcpy(&sin6->sin6_addr, t->saddr.a6,
2165 sizeof(struct in6_addr));
2166 sin6->sin6_scope_id = 0;
2167
2168 sin6++;
2169 sin6->sin6_family = AF_INET6;
2170 sin6->sin6_port = 0;
2171 sin6->sin6_flowinfo = 0;
2172 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
2173 sizeof(struct in6_addr));
2174 sin6->sin6_scope_id = 0;
2175 break;
2176 #endif
2177 default:
2178 break;
2179 }
2180 }
2181 }
2182
2183 /* security context */
2184 if ((xfrm_ctx = xp->security)) {
2185 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2186
2187 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2188 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2189 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2190 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2191 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2192 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2193 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2194 xfrm_ctx->ctx_len);
2195 }
2196
2197 hdr->sadb_msg_len = size / sizeof(uint64_t);
2198 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2199
2200 return 0;
2201 }
2202
2203 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2204 {
2205 struct sk_buff *out_skb;
2206 struct sadb_msg *out_hdr;
2207 int err;
2208
2209 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2210 if (IS_ERR(out_skb)) {
2211 err = PTR_ERR(out_skb);
2212 goto out;
2213 }
2214 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2215 if (err < 0)
2216 return err;
2217
2218 out_hdr = (struct sadb_msg *) out_skb->data;
2219 out_hdr->sadb_msg_version = PF_KEY_V2;
2220
2221 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2222 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2223 else
2224 out_hdr->sadb_msg_type = event2poltype(c->event);
2225 out_hdr->sadb_msg_errno = 0;
2226 out_hdr->sadb_msg_seq = c->seq;
2227 out_hdr->sadb_msg_pid = c->pid;
2228 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2229 out:
2230 return 0;
2231
2232 }
2233
2234 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2235 {
2236 int err = 0;
2237 struct sadb_lifetime *lifetime;
2238 struct sadb_address *sa;
2239 struct sadb_x_policy *pol;
2240 struct xfrm_policy *xp;
2241 struct km_event c;
2242 struct sadb_x_sec_ctx *sec_ctx;
2243
2244 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2245 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2246 !ext_hdrs[SADB_X_EXT_POLICY-1])
2247 return -EINVAL;
2248
2249 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2250 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2251 return -EINVAL;
2252 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2253 return -EINVAL;
2254
2255 xp = xfrm_policy_alloc(GFP_KERNEL);
2256 if (xp == NULL)
2257 return -ENOBUFS;
2258
2259 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2260 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2261 xp->priority = pol->sadb_x_policy_priority;
2262
2263 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2264 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2265 if (!xp->family) {
2266 err = -EINVAL;
2267 goto out;
2268 }
2269 xp->selector.family = xp->family;
2270 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2271 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2272 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2273 if (xp->selector.sport)
2274 xp->selector.sport_mask = htons(0xffff);
2275
2276 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2277 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2278 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2279
2280 /* Amusing, we set this twice. KAME apps appear to set same value
2281 * in both addresses.
2282 */
2283 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2284
2285 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2286 if (xp->selector.dport)
2287 xp->selector.dport_mask = htons(0xffff);
2288
2289 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2290 if (sec_ctx != NULL) {
2291 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2292
2293 if (!uctx) {
2294 err = -ENOBUFS;
2295 goto out;
2296 }
2297
2298 err = security_xfrm_policy_alloc(&xp->security, uctx);
2299 kfree(uctx);
2300
2301 if (err)
2302 goto out;
2303 }
2304
2305 xp->lft.soft_byte_limit = XFRM_INF;
2306 xp->lft.hard_byte_limit = XFRM_INF;
2307 xp->lft.soft_packet_limit = XFRM_INF;
2308 xp->lft.hard_packet_limit = XFRM_INF;
2309 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2310 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2311 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2312 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2313 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2314 }
2315 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2316 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2317 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2318 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2319 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2320 }
2321 xp->xfrm_nr = 0;
2322 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2323 (err = parse_ipsecrequests(xp, pol)) < 0)
2324 goto out;
2325
2326 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2327 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2328
2329 xfrm_audit_policy_add(xp, err ? 0 : 1,
2330 audit_get_loginuid(current),
2331 audit_get_sessionid(current), 0);
2332
2333 if (err)
2334 goto out;
2335
2336 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2337 c.event = XFRM_MSG_UPDPOLICY;
2338 else
2339 c.event = XFRM_MSG_NEWPOLICY;
2340
2341 c.seq = hdr->sadb_msg_seq;
2342 c.pid = hdr->sadb_msg_pid;
2343
2344 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2345 xfrm_pol_put(xp);
2346 return 0;
2347
2348 out:
2349 xp->dead = 1;
2350 xfrm_policy_destroy(xp);
2351 return err;
2352 }
2353
2354 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2355 {
2356 int err;
2357 struct sadb_address *sa;
2358 struct sadb_x_policy *pol;
2359 struct xfrm_policy *xp;
2360 struct xfrm_selector sel;
2361 struct km_event c;
2362 struct sadb_x_sec_ctx *sec_ctx;
2363 struct xfrm_sec_ctx *pol_ctx = NULL;
2364
2365 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2366 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2367 !ext_hdrs[SADB_X_EXT_POLICY-1])
2368 return -EINVAL;
2369
2370 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2371 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2372 return -EINVAL;
2373
2374 memset(&sel, 0, sizeof(sel));
2375
2376 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2377 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2378 sel.prefixlen_s = sa->sadb_address_prefixlen;
2379 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2380 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2381 if (sel.sport)
2382 sel.sport_mask = htons(0xffff);
2383
2384 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2385 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2386 sel.prefixlen_d = sa->sadb_address_prefixlen;
2387 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2388 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2389 if (sel.dport)
2390 sel.dport_mask = htons(0xffff);
2391
2392 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2393 if (sec_ctx != NULL) {
2394 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2395
2396 if (!uctx)
2397 return -ENOMEM;
2398
2399 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2400 kfree(uctx);
2401 if (err)
2402 return err;
2403 }
2404
2405 xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN,
2406 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2407 1, &err);
2408 security_xfrm_policy_free(pol_ctx);
2409 if (xp == NULL)
2410 return -ENOENT;
2411
2412 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2413 audit_get_loginuid(current),
2414 audit_get_sessionid(current), 0);
2415
2416 if (err)
2417 goto out;
2418
2419 c.seq = hdr->sadb_msg_seq;
2420 c.pid = hdr->sadb_msg_pid;
2421 c.event = XFRM_MSG_DELPOLICY;
2422 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2423
2424 out:
2425 xfrm_pol_put(xp);
2426 return err;
2427 }
2428
2429 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2430 {
2431 int err;
2432 struct sk_buff *out_skb;
2433 struct sadb_msg *out_hdr;
2434 err = 0;
2435
2436 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2437 if (IS_ERR(out_skb)) {
2438 err = PTR_ERR(out_skb);
2439 goto out;
2440 }
2441 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2442 if (err < 0)
2443 goto out;
2444
2445 out_hdr = (struct sadb_msg *) out_skb->data;
2446 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2447 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2448 out_hdr->sadb_msg_satype = 0;
2449 out_hdr->sadb_msg_errno = 0;
2450 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2451 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2452 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2453 err = 0;
2454
2455 out:
2456 return err;
2457 }
2458
2459 #ifdef CONFIG_NET_KEY_MIGRATE
2460 static int pfkey_sockaddr_pair_size(sa_family_t family)
2461 {
2462 switch (family) {
2463 case AF_INET:
2464 return PFKEY_ALIGN8(sizeof(struct sockaddr_in) * 2);
2465 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2466 case AF_INET6:
2467 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6) * 2);
2468 #endif
2469 default:
2470 return 0;
2471 }
2472 /* NOTREACHED */
2473 }
2474
2475 static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
2476 xfrm_address_t *saddr, xfrm_address_t *daddr,
2477 u16 *family)
2478 {
2479 struct sockaddr *sa = (struct sockaddr *)(rq + 1);
2480 if (rq->sadb_x_ipsecrequest_len <
2481 pfkey_sockaddr_pair_size(sa->sa_family))
2482 return -EINVAL;
2483
2484 switch (sa->sa_family) {
2485 case AF_INET:
2486 {
2487 struct sockaddr_in *sin;
2488 sin = (struct sockaddr_in *)sa;
2489 if ((sin+1)->sin_family != AF_INET)
2490 return -EINVAL;
2491 memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4));
2492 sin++;
2493 memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4));
2494 *family = AF_INET;
2495 break;
2496 }
2497 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2498 case AF_INET6:
2499 {
2500 struct sockaddr_in6 *sin6;
2501 sin6 = (struct sockaddr_in6 *)sa;
2502 if ((sin6+1)->sin6_family != AF_INET6)
2503 return -EINVAL;
2504 memcpy(&saddr->a6, &sin6->sin6_addr,
2505 sizeof(saddr->a6));
2506 sin6++;
2507 memcpy(&daddr->a6, &sin6->sin6_addr,
2508 sizeof(daddr->a6));
2509 *family = AF_INET6;
2510 break;
2511 }
2512 #endif
2513 default:
2514 return -EINVAL;
2515 }
2516
2517 return 0;
2518 }
2519
2520 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2521 struct xfrm_migrate *m)
2522 {
2523 int err;
2524 struct sadb_x_ipsecrequest *rq2;
2525 int mode;
2526
2527 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2528 len < rq1->sadb_x_ipsecrequest_len)
2529 return -EINVAL;
2530
2531 /* old endoints */
2532 err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
2533 &m->old_family);
2534 if (err)
2535 return err;
2536
2537 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2538 len -= rq1->sadb_x_ipsecrequest_len;
2539
2540 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2541 len < rq2->sadb_x_ipsecrequest_len)
2542 return -EINVAL;
2543
2544 /* new endpoints */
2545 err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
2546 &m->new_family);
2547 if (err)
2548 return err;
2549
2550 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2551 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2552 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2553 return -EINVAL;
2554
2555 m->proto = rq1->sadb_x_ipsecrequest_proto;
2556 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2557 return -EINVAL;
2558 m->mode = mode;
2559 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2560
2561 return ((int)(rq1->sadb_x_ipsecrequest_len +
2562 rq2->sadb_x_ipsecrequest_len));
2563 }
2564
2565 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2566 struct sadb_msg *hdr, void **ext_hdrs)
2567 {
2568 int i, len, ret, err = -EINVAL;
2569 u8 dir;
2570 struct sadb_address *sa;
2571 struct sadb_x_policy *pol;
2572 struct sadb_x_ipsecrequest *rq;
2573 struct xfrm_selector sel;
2574 struct xfrm_migrate m[XFRM_MAX_DEPTH];
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 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2584 if (!pol) {
2585 err = -EINVAL;
2586 goto out;
2587 }
2588
2589 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2590 err = -EINVAL;
2591 goto out;
2592 }
2593
2594 dir = pol->sadb_x_policy_dir - 1;
2595 memset(&sel, 0, sizeof(sel));
2596
2597 /* set source address info of selector */
2598 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2599 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2600 sel.prefixlen_s = sa->sadb_address_prefixlen;
2601 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2602 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2603 if (sel.sport)
2604 sel.sport_mask = htons(0xffff);
2605
2606 /* set destination address info of selector */
2607 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2608 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2609 sel.prefixlen_d = sa->sadb_address_prefixlen;
2610 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2611 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2612 if (sel.dport)
2613 sel.dport_mask = htons(0xffff);
2614
2615 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2616
2617 /* extract ipsecrequests */
2618 i = 0;
2619 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2620
2621 while (len > 0 && i < XFRM_MAX_DEPTH) {
2622 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2623 if (ret < 0) {
2624 err = ret;
2625 goto out;
2626 } else {
2627 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2628 len -= ret;
2629 i++;
2630 }
2631 }
2632
2633 if (!i || len > 0) {
2634 err = -EINVAL;
2635 goto out;
2636 }
2637
2638 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
2639
2640 out:
2641 return err;
2642 }
2643 #else
2644 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2645 struct sadb_msg *hdr, void **ext_hdrs)
2646 {
2647 return -ENOPROTOOPT;
2648 }
2649 #endif
2650
2651
2652 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2653 {
2654 unsigned int dir;
2655 int err = 0, delete;
2656 struct sadb_x_policy *pol;
2657 struct xfrm_policy *xp;
2658 struct km_event c;
2659
2660 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2661 return -EINVAL;
2662
2663 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2664 if (dir >= XFRM_POLICY_MAX)
2665 return -EINVAL;
2666
2667 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2668 xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2669 delete, &err);
2670 if (xp == NULL)
2671 return -ENOENT;
2672
2673 if (delete) {
2674 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2675 audit_get_loginuid(current),
2676 audit_get_sessionid(current), 0);
2677
2678 if (err)
2679 goto out;
2680 c.seq = hdr->sadb_msg_seq;
2681 c.pid = hdr->sadb_msg_pid;
2682 c.data.byid = 1;
2683 c.event = XFRM_MSG_DELPOLICY;
2684 km_policy_notify(xp, dir, &c);
2685 } else {
2686 err = key_pol_get_resp(sk, xp, hdr, dir);
2687 }
2688
2689 out:
2690 xfrm_pol_put(xp);
2691 return err;
2692 }
2693
2694 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2695 {
2696 struct pfkey_sock *pfk = ptr;
2697 struct sk_buff *out_skb;
2698 struct sadb_msg *out_hdr;
2699 int err;
2700
2701 if (!pfkey_can_dump(&pfk->sk))
2702 return -ENOBUFS;
2703
2704 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2705 if (IS_ERR(out_skb))
2706 return PTR_ERR(out_skb);
2707
2708 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2709 if (err < 0)
2710 return err;
2711
2712 out_hdr = (struct sadb_msg *) out_skb->data;
2713 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2714 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2715 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2716 out_hdr->sadb_msg_errno = 0;
2717 out_hdr->sadb_msg_seq = count;
2718 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2719 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
2720 return 0;
2721 }
2722
2723 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2724 {
2725 return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
2726 }
2727
2728 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2729 {
2730 xfrm_policy_walk_done(&pfk->dump.u.policy);
2731 }
2732
2733 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2734 {
2735 struct pfkey_sock *pfk = pfkey_sk(sk);
2736
2737 if (pfk->dump.dump != NULL)
2738 return -EBUSY;
2739
2740 pfk->dump.msg_version = hdr->sadb_msg_version;
2741 pfk->dump.msg_pid = hdr->sadb_msg_pid;
2742 pfk->dump.dump = pfkey_dump_sp;
2743 pfk->dump.done = pfkey_dump_sp_done;
2744 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2745
2746 return pfkey_do_dump(pfk);
2747 }
2748
2749 static int key_notify_policy_flush(struct km_event *c)
2750 {
2751 struct sk_buff *skb_out;
2752 struct sadb_msg *hdr;
2753
2754 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2755 if (!skb_out)
2756 return -ENOBUFS;
2757 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2758 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2759 hdr->sadb_msg_seq = c->seq;
2760 hdr->sadb_msg_pid = c->pid;
2761 hdr->sadb_msg_version = PF_KEY_V2;
2762 hdr->sadb_msg_errno = (uint8_t) 0;
2763 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2764 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2765 return 0;
2766
2767 }
2768
2769 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2770 {
2771 struct km_event c;
2772 struct xfrm_audit audit_info;
2773 int err;
2774
2775 audit_info.loginuid = audit_get_loginuid(current);
2776 audit_info.sessionid = audit_get_sessionid(current);
2777 audit_info.secid = 0;
2778 err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
2779 if (err)
2780 return err;
2781 c.data.type = XFRM_POLICY_TYPE_MAIN;
2782 c.event = XFRM_MSG_FLUSHPOLICY;
2783 c.pid = hdr->sadb_msg_pid;
2784 c.seq = hdr->sadb_msg_seq;
2785 km_policy_notify(NULL, 0, &c);
2786
2787 return 0;
2788 }
2789
2790 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2791 struct sadb_msg *hdr, void **ext_hdrs);
2792 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2793 [SADB_RESERVED] = pfkey_reserved,
2794 [SADB_GETSPI] = pfkey_getspi,
2795 [SADB_UPDATE] = pfkey_add,
2796 [SADB_ADD] = pfkey_add,
2797 [SADB_DELETE] = pfkey_delete,
2798 [SADB_GET] = pfkey_get,
2799 [SADB_ACQUIRE] = pfkey_acquire,
2800 [SADB_REGISTER] = pfkey_register,
2801 [SADB_EXPIRE] = NULL,
2802 [SADB_FLUSH] = pfkey_flush,
2803 [SADB_DUMP] = pfkey_dump,
2804 [SADB_X_PROMISC] = pfkey_promisc,
2805 [SADB_X_PCHANGE] = NULL,
2806 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2807 [SADB_X_SPDADD] = pfkey_spdadd,
2808 [SADB_X_SPDDELETE] = pfkey_spddelete,
2809 [SADB_X_SPDGET] = pfkey_spdget,
2810 [SADB_X_SPDACQUIRE] = NULL,
2811 [SADB_X_SPDDUMP] = pfkey_spddump,
2812 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2813 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2814 [SADB_X_SPDDELETE2] = pfkey_spdget,
2815 [SADB_X_MIGRATE] = pfkey_migrate,
2816 };
2817
2818 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2819 {
2820 void *ext_hdrs[SADB_EXT_MAX];
2821 int err;
2822
2823 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2824 BROADCAST_PROMISC_ONLY, NULL);
2825
2826 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2827 err = parse_exthdrs(skb, hdr, ext_hdrs);
2828 if (!err) {
2829 err = -EOPNOTSUPP;
2830 if (pfkey_funcs[hdr->sadb_msg_type])
2831 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2832 }
2833 return err;
2834 }
2835
2836 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2837 {
2838 struct sadb_msg *hdr = NULL;
2839
2840 if (skb->len < sizeof(*hdr)) {
2841 *errp = -EMSGSIZE;
2842 } else {
2843 hdr = (struct sadb_msg *) skb->data;
2844 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2845 hdr->sadb_msg_reserved != 0 ||
2846 (hdr->sadb_msg_type <= SADB_RESERVED ||
2847 hdr->sadb_msg_type > SADB_MAX)) {
2848 hdr = NULL;
2849 *errp = -EINVAL;
2850 } else if (hdr->sadb_msg_len != (skb->len /
2851 sizeof(uint64_t)) ||
2852 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2853 sizeof(uint64_t))) {
2854 hdr = NULL;
2855 *errp = -EMSGSIZE;
2856 } else {
2857 *errp = 0;
2858 }
2859 }
2860 return hdr;
2861 }
2862
2863 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2864 {
2865 unsigned int id = d->desc.sadb_alg_id;
2866
2867 if (id >= sizeof(t->aalgos) * 8)
2868 return 0;
2869
2870 return (t->aalgos >> id) & 1;
2871 }
2872
2873 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2874 {
2875 unsigned int id = d->desc.sadb_alg_id;
2876
2877 if (id >= sizeof(t->ealgos) * 8)
2878 return 0;
2879
2880 return (t->ealgos >> id) & 1;
2881 }
2882
2883 static int count_ah_combs(struct xfrm_tmpl *t)
2884 {
2885 int i, sz = 0;
2886
2887 for (i = 0; ; i++) {
2888 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2889 if (!aalg)
2890 break;
2891 if (aalg_tmpl_set(t, aalg) && aalg->available)
2892 sz += sizeof(struct sadb_comb);
2893 }
2894 return sz + sizeof(struct sadb_prop);
2895 }
2896
2897 static int count_esp_combs(struct xfrm_tmpl *t)
2898 {
2899 int i, k, sz = 0;
2900
2901 for (i = 0; ; i++) {
2902 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2903 if (!ealg)
2904 break;
2905
2906 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2907 continue;
2908
2909 for (k = 1; ; k++) {
2910 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2911 if (!aalg)
2912 break;
2913
2914 if (aalg_tmpl_set(t, aalg) && aalg->available)
2915 sz += sizeof(struct sadb_comb);
2916 }
2917 }
2918 return sz + sizeof(struct sadb_prop);
2919 }
2920
2921 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2922 {
2923 struct sadb_prop *p;
2924 int i;
2925
2926 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2927 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2928 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2929 p->sadb_prop_replay = 32;
2930 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2931
2932 for (i = 0; ; i++) {
2933 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2934 if (!aalg)
2935 break;
2936
2937 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2938 struct sadb_comb *c;
2939 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2940 memset(c, 0, sizeof(*c));
2941 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2942 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2943 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2944 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2945 c->sadb_comb_hard_addtime = 24*60*60;
2946 c->sadb_comb_soft_addtime = 20*60*60;
2947 c->sadb_comb_hard_usetime = 8*60*60;
2948 c->sadb_comb_soft_usetime = 7*60*60;
2949 }
2950 }
2951 }
2952
2953 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2954 {
2955 struct sadb_prop *p;
2956 int i, k;
2957
2958 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2959 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2960 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2961 p->sadb_prop_replay = 32;
2962 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2963
2964 for (i=0; ; i++) {
2965 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2966 if (!ealg)
2967 break;
2968
2969 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2970 continue;
2971
2972 for (k = 1; ; k++) {
2973 struct sadb_comb *c;
2974 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2975 if (!aalg)
2976 break;
2977 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2978 continue;
2979 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2980 memset(c, 0, sizeof(*c));
2981 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2982 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2983 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2984 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2985 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2986 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2987 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2988 c->sadb_comb_hard_addtime = 24*60*60;
2989 c->sadb_comb_soft_addtime = 20*60*60;
2990 c->sadb_comb_hard_usetime = 8*60*60;
2991 c->sadb_comb_soft_usetime = 7*60*60;
2992 }
2993 }
2994 }
2995
2996 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2997 {
2998 return 0;
2999 }
3000
3001 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
3002 {
3003 struct sk_buff *out_skb;
3004 struct sadb_msg *out_hdr;
3005 int hard;
3006 int hsc;
3007
3008 hard = c->data.hard;
3009 if (hard)
3010 hsc = 2;
3011 else
3012 hsc = 1;
3013
3014 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3015 if (IS_ERR(out_skb))
3016 return PTR_ERR(out_skb);
3017
3018 out_hdr = (struct sadb_msg *) out_skb->data;
3019 out_hdr->sadb_msg_version = PF_KEY_V2;
3020 out_hdr->sadb_msg_type = SADB_EXPIRE;
3021 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3022 out_hdr->sadb_msg_errno = 0;
3023 out_hdr->sadb_msg_reserved = 0;
3024 out_hdr->sadb_msg_seq = 0;
3025 out_hdr->sadb_msg_pid = 0;
3026
3027 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3028 return 0;
3029 }
3030
3031 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
3032 {
3033 if (atomic_read(&pfkey_socks_nr) == 0)
3034 return 0;
3035
3036 switch (c->event) {
3037 case XFRM_MSG_EXPIRE:
3038 return key_notify_sa_expire(x, c);
3039 case XFRM_MSG_DELSA:
3040 case XFRM_MSG_NEWSA:
3041 case XFRM_MSG_UPDSA:
3042 return key_notify_sa(x, c);
3043 case XFRM_MSG_FLUSHSA:
3044 return key_notify_sa_flush(c);
3045 case XFRM_MSG_NEWAE: /* not yet supported */
3046 break;
3047 default:
3048 printk("pfkey: Unknown SA event %d\n", c->event);
3049 break;
3050 }
3051
3052 return 0;
3053 }
3054
3055 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
3056 {
3057 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3058 return 0;
3059
3060 switch (c->event) {
3061 case XFRM_MSG_POLEXPIRE:
3062 return key_notify_policy_expire(xp, c);
3063 case XFRM_MSG_DELPOLICY:
3064 case XFRM_MSG_NEWPOLICY:
3065 case XFRM_MSG_UPDPOLICY:
3066 return key_notify_policy(xp, dir, c);
3067 case XFRM_MSG_FLUSHPOLICY:
3068 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3069 break;
3070 return key_notify_policy_flush(c);
3071 default:
3072 printk("pfkey: Unknown policy event %d\n", c->event);
3073 break;
3074 }
3075
3076 return 0;
3077 }
3078
3079 static u32 get_acqseq(void)
3080 {
3081 u32 res;
3082 static u32 acqseq;
3083 static DEFINE_SPINLOCK(acqseq_lock);
3084
3085 spin_lock_bh(&acqseq_lock);
3086 res = (++acqseq ? : ++acqseq);
3087 spin_unlock_bh(&acqseq_lock);
3088 return res;
3089 }
3090
3091 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3092 {
3093 struct sk_buff *skb;
3094 struct sadb_msg *hdr;
3095 struct sadb_address *addr;
3096 struct sadb_x_policy *pol;
3097 struct sockaddr_in *sin;
3098 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3099 struct sockaddr_in6 *sin6;
3100 #endif
3101 int sockaddr_size;
3102 int size;
3103 struct sadb_x_sec_ctx *sec_ctx;
3104 struct xfrm_sec_ctx *xfrm_ctx;
3105 int ctx_size = 0;
3106
3107 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3108 if (!sockaddr_size)
3109 return -EINVAL;
3110
3111 size = sizeof(struct sadb_msg) +
3112 (sizeof(struct sadb_address) * 2) +
3113 (sockaddr_size * 2) +
3114 sizeof(struct sadb_x_policy);
3115
3116 if (x->id.proto == IPPROTO_AH)
3117 size += count_ah_combs(t);
3118 else if (x->id.proto == IPPROTO_ESP)
3119 size += count_esp_combs(t);
3120
3121 if ((xfrm_ctx = x->security)) {
3122 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3123 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3124 }
3125
3126 skb = alloc_skb(size + 16, GFP_ATOMIC);
3127 if (skb == NULL)
3128 return -ENOMEM;
3129
3130 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3131 hdr->sadb_msg_version = PF_KEY_V2;
3132 hdr->sadb_msg_type = SADB_ACQUIRE;
3133 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3134 hdr->sadb_msg_len = size / sizeof(uint64_t);
3135 hdr->sadb_msg_errno = 0;
3136 hdr->sadb_msg_reserved = 0;
3137 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3138 hdr->sadb_msg_pid = 0;
3139
3140 /* src address */
3141 addr = (struct sadb_address*) skb_put(skb,
3142 sizeof(struct sadb_address)+sockaddr_size);
3143 addr->sadb_address_len =
3144 (sizeof(struct sadb_address)+sockaddr_size)/
3145 sizeof(uint64_t);
3146 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3147 addr->sadb_address_proto = 0;
3148 addr->sadb_address_reserved = 0;
3149 if (x->props.family == AF_INET) {
3150 addr->sadb_address_prefixlen = 32;
3151
3152 sin = (struct sockaddr_in *) (addr + 1);
3153 sin->sin_family = AF_INET;
3154 sin->sin_addr.s_addr = x->props.saddr.a4;
3155 sin->sin_port = 0;
3156 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3157 }
3158 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3159 else if (x->props.family == AF_INET6) {
3160 addr->sadb_address_prefixlen = 128;
3161
3162 sin6 = (struct sockaddr_in6 *) (addr + 1);
3163 sin6->sin6_family = AF_INET6;
3164 sin6->sin6_port = 0;
3165 sin6->sin6_flowinfo = 0;
3166 memcpy(&sin6->sin6_addr,
3167 x->props.saddr.a6, sizeof(struct in6_addr));
3168 sin6->sin6_scope_id = 0;
3169 }
3170 #endif
3171 else
3172 BUG();
3173
3174 /* dst address */
3175 addr = (struct sadb_address*) skb_put(skb,
3176 sizeof(struct sadb_address)+sockaddr_size);
3177 addr->sadb_address_len =
3178 (sizeof(struct sadb_address)+sockaddr_size)/
3179 sizeof(uint64_t);
3180 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3181 addr->sadb_address_proto = 0;
3182 addr->sadb_address_reserved = 0;
3183 if (x->props.family == AF_INET) {
3184 addr->sadb_address_prefixlen = 32;
3185
3186 sin = (struct sockaddr_in *) (addr + 1);
3187 sin->sin_family = AF_INET;
3188 sin->sin_addr.s_addr = x->id.daddr.a4;
3189 sin->sin_port = 0;
3190 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3191 }
3192 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3193 else if (x->props.family == AF_INET6) {
3194 addr->sadb_address_prefixlen = 128;
3195
3196 sin6 = (struct sockaddr_in6 *) (addr + 1);
3197 sin6->sin6_family = AF_INET6;
3198 sin6->sin6_port = 0;
3199 sin6->sin6_flowinfo = 0;
3200 memcpy(&sin6->sin6_addr,
3201 x->id.daddr.a6, sizeof(struct in6_addr));
3202 sin6->sin6_scope_id = 0;
3203 }
3204 #endif
3205 else
3206 BUG();
3207
3208 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3209 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3210 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3211 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3212 pol->sadb_x_policy_dir = dir+1;
3213 pol->sadb_x_policy_id = xp->index;
3214
3215 /* Set sadb_comb's. */
3216 if (x->id.proto == IPPROTO_AH)
3217 dump_ah_combs(skb, t);
3218 else if (x->id.proto == IPPROTO_ESP)
3219 dump_esp_combs(skb, t);
3220
3221 /* security context */
3222 if (xfrm_ctx) {
3223 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3224 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3225 sec_ctx->sadb_x_sec_len =
3226 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3227 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3228 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3229 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3230 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3231 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3232 xfrm_ctx->ctx_len);
3233 }
3234
3235 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3236 }
3237
3238 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3239 u8 *data, int len, int *dir)
3240 {
3241 struct xfrm_policy *xp;
3242 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3243 struct sadb_x_sec_ctx *sec_ctx;
3244
3245 switch (sk->sk_family) {
3246 case AF_INET:
3247 if (opt != IP_IPSEC_POLICY) {
3248 *dir = -EOPNOTSUPP;
3249 return NULL;
3250 }
3251 break;
3252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3253 case AF_INET6:
3254 if (opt != IPV6_IPSEC_POLICY) {
3255 *dir = -EOPNOTSUPP;
3256 return NULL;
3257 }
3258 break;
3259 #endif
3260 default:
3261 *dir = -EINVAL;
3262 return NULL;
3263 }
3264
3265 *dir = -EINVAL;
3266
3267 if (len < sizeof(struct sadb_x_policy) ||
3268 pol->sadb_x_policy_len*8 > len ||
3269 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3270 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3271 return NULL;
3272
3273 xp = xfrm_policy_alloc(GFP_ATOMIC);
3274 if (xp == NULL) {
3275 *dir = -ENOBUFS;
3276 return NULL;
3277 }
3278
3279 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3280 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3281
3282 xp->lft.soft_byte_limit = XFRM_INF;
3283 xp->lft.hard_byte_limit = XFRM_INF;
3284 xp->lft.soft_packet_limit = XFRM_INF;
3285 xp->lft.hard_packet_limit = XFRM_INF;
3286 xp->family = sk->sk_family;
3287
3288 xp->xfrm_nr = 0;
3289 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3290 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3291 goto out;
3292
3293 /* security context too */
3294 if (len >= (pol->sadb_x_policy_len*8 +
3295 sizeof(struct sadb_x_sec_ctx))) {
3296 char *p = (char *)pol;
3297 struct xfrm_user_sec_ctx *uctx;
3298
3299 p += pol->sadb_x_policy_len*8;
3300 sec_ctx = (struct sadb_x_sec_ctx *)p;
3301 if (len < pol->sadb_x_policy_len*8 +
3302 sec_ctx->sadb_x_sec_len) {
3303 *dir = -EINVAL;
3304 goto out;
3305 }
3306 if ((*dir = verify_sec_ctx_len(p)))
3307 goto out;
3308 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3309 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3310 kfree(uctx);
3311
3312 if (*dir)
3313 goto out;
3314 }
3315
3316 *dir = pol->sadb_x_policy_dir-1;
3317 return xp;
3318
3319 out:
3320 xfrm_policy_destroy(xp);
3321 return NULL;
3322 }
3323
3324 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3325 {
3326 struct sk_buff *skb;
3327 struct sadb_msg *hdr;
3328 struct sadb_sa *sa;
3329 struct sadb_address *addr;
3330 struct sadb_x_nat_t_port *n_port;
3331 struct sockaddr_in *sin;
3332 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3333 struct sockaddr_in6 *sin6;
3334 #endif
3335 int sockaddr_size;
3336 int size;
3337 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3338 struct xfrm_encap_tmpl *natt = NULL;
3339
3340 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3341 if (!sockaddr_size)
3342 return -EINVAL;
3343
3344 if (!satype)
3345 return -EINVAL;
3346
3347 if (!x->encap)
3348 return -EINVAL;
3349
3350 natt = x->encap;
3351
3352 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3353 *
3354 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3355 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3356 */
3357
3358 size = sizeof(struct sadb_msg) +
3359 sizeof(struct sadb_sa) +
3360 (sizeof(struct sadb_address) * 2) +
3361 (sockaddr_size * 2) +
3362 (sizeof(struct sadb_x_nat_t_port) * 2);
3363
3364 skb = alloc_skb(size + 16, GFP_ATOMIC);
3365 if (skb == NULL)
3366 return -ENOMEM;
3367
3368 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3369 hdr->sadb_msg_version = PF_KEY_V2;
3370 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3371 hdr->sadb_msg_satype = satype;
3372 hdr->sadb_msg_len = size / sizeof(uint64_t);
3373 hdr->sadb_msg_errno = 0;
3374 hdr->sadb_msg_reserved = 0;
3375 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3376 hdr->sadb_msg_pid = 0;
3377
3378 /* SA */
3379 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3380 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3381 sa->sadb_sa_exttype = SADB_EXT_SA;
3382 sa->sadb_sa_spi = x->id.spi;
3383 sa->sadb_sa_replay = 0;
3384 sa->sadb_sa_state = 0;
3385 sa->sadb_sa_auth = 0;
3386 sa->sadb_sa_encrypt = 0;
3387 sa->sadb_sa_flags = 0;
3388
3389 /* ADDRESS_SRC (old addr) */
3390 addr = (struct sadb_address*)
3391 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3392 addr->sadb_address_len =
3393 (sizeof(struct sadb_address)+sockaddr_size)/
3394 sizeof(uint64_t);
3395 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3396 addr->sadb_address_proto = 0;
3397 addr->sadb_address_reserved = 0;
3398 if (x->props.family == AF_INET) {
3399 addr->sadb_address_prefixlen = 32;
3400
3401 sin = (struct sockaddr_in *) (addr + 1);
3402 sin->sin_family = AF_INET;
3403 sin->sin_addr.s_addr = x->props.saddr.a4;
3404 sin->sin_port = 0;
3405 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3406 }
3407 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3408 else if (x->props.family == AF_INET6) {
3409 addr->sadb_address_prefixlen = 128;
3410
3411 sin6 = (struct sockaddr_in6 *) (addr + 1);
3412 sin6->sin6_family = AF_INET6;
3413 sin6->sin6_port = 0;
3414 sin6->sin6_flowinfo = 0;
3415 memcpy(&sin6->sin6_addr,
3416 x->props.saddr.a6, sizeof(struct in6_addr));
3417 sin6->sin6_scope_id = 0;
3418 }
3419 #endif
3420 else
3421 BUG();
3422
3423 /* NAT_T_SPORT (old port) */
3424 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3425 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3426 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3427 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3428 n_port->sadb_x_nat_t_port_reserved = 0;
3429
3430 /* ADDRESS_DST (new addr) */
3431 addr = (struct sadb_address*)
3432 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3433 addr->sadb_address_len =
3434 (sizeof(struct sadb_address)+sockaddr_size)/
3435 sizeof(uint64_t);
3436 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3437 addr->sadb_address_proto = 0;
3438 addr->sadb_address_reserved = 0;
3439 if (x->props.family == AF_INET) {
3440 addr->sadb_address_prefixlen = 32;
3441
3442 sin = (struct sockaddr_in *) (addr + 1);
3443 sin->sin_family = AF_INET;
3444 sin->sin_addr.s_addr = ipaddr->a4;
3445 sin->sin_port = 0;
3446 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3447 }
3448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3449 else if (x->props.family == AF_INET6) {
3450 addr->sadb_address_prefixlen = 128;
3451
3452 sin6 = (struct sockaddr_in6 *) (addr + 1);
3453 sin6->sin6_family = AF_INET6;
3454 sin6->sin6_port = 0;
3455 sin6->sin6_flowinfo = 0;
3456 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
3457 sin6->sin6_scope_id = 0;
3458 }
3459 #endif
3460 else
3461 BUG();
3462
3463 /* NAT_T_DPORT (new port) */
3464 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3465 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3466 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3467 n_port->sadb_x_nat_t_port_port = sport;
3468 n_port->sadb_x_nat_t_port_reserved = 0;
3469
3470 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3471 }
3472
3473 #ifdef CONFIG_NET_KEY_MIGRATE
3474 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3475 struct xfrm_selector *sel)
3476 {
3477 struct sadb_address *addr;
3478 struct sockaddr_in *sin;
3479 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3480 struct sockaddr_in6 *sin6;
3481 #endif
3482 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3483 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3484 addr->sadb_address_exttype = type;
3485 addr->sadb_address_proto = sel->proto;
3486 addr->sadb_address_reserved = 0;
3487
3488 switch (type) {
3489 case SADB_EXT_ADDRESS_SRC:
3490 if (sel->family == AF_INET) {
3491 addr->sadb_address_prefixlen = sel->prefixlen_s;
3492 sin = (struct sockaddr_in *)(addr + 1);
3493 sin->sin_family = AF_INET;
3494 memcpy(&sin->sin_addr.s_addr, &sel->saddr,
3495 sizeof(sin->sin_addr.s_addr));
3496 sin->sin_port = 0;
3497 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3498 }
3499 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3500 else if (sel->family == AF_INET6) {
3501 addr->sadb_address_prefixlen = sel->prefixlen_s;
3502 sin6 = (struct sockaddr_in6 *)(addr + 1);
3503 sin6->sin6_family = AF_INET6;
3504 sin6->sin6_port = 0;
3505 sin6->sin6_flowinfo = 0;
3506 sin6->sin6_scope_id = 0;
3507 memcpy(&sin6->sin6_addr.s6_addr, &sel->saddr,
3508 sizeof(sin6->sin6_addr.s6_addr));
3509 }
3510 #endif
3511 break;
3512 case SADB_EXT_ADDRESS_DST:
3513 if (sel->family == AF_INET) {
3514 addr->sadb_address_prefixlen = sel->prefixlen_d;
3515 sin = (struct sockaddr_in *)(addr + 1);
3516 sin->sin_family = AF_INET;
3517 memcpy(&sin->sin_addr.s_addr, &sel->daddr,
3518 sizeof(sin->sin_addr.s_addr));
3519 sin->sin_port = 0;
3520 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3521 }
3522 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3523 else if (sel->family == AF_INET6) {
3524 addr->sadb_address_prefixlen = sel->prefixlen_d;
3525 sin6 = (struct sockaddr_in6 *)(addr + 1);
3526 sin6->sin6_family = AF_INET6;
3527 sin6->sin6_port = 0;
3528 sin6->sin6_flowinfo = 0;
3529 sin6->sin6_scope_id = 0;
3530 memcpy(&sin6->sin6_addr.s6_addr, &sel->daddr,
3531 sizeof(sin6->sin6_addr.s6_addr));
3532 }
3533 #endif
3534 break;
3535 default:
3536 return -EINVAL;
3537 }
3538
3539 return 0;
3540 }
3541
3542 static int set_ipsecrequest(struct sk_buff *skb,
3543 uint8_t proto, uint8_t mode, int level,
3544 uint32_t reqid, uint8_t family,
3545 xfrm_address_t *src, xfrm_address_t *dst)
3546 {
3547 struct sadb_x_ipsecrequest *rq;
3548 struct sockaddr_in *sin;
3549 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3550 struct sockaddr_in6 *sin6;
3551 #endif
3552 int size_req;
3553
3554 size_req = sizeof(struct sadb_x_ipsecrequest) +
3555 pfkey_sockaddr_pair_size(family);
3556
3557 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3558 memset(rq, 0, size_req);
3559 rq->sadb_x_ipsecrequest_len = size_req;
3560 rq->sadb_x_ipsecrequest_proto = proto;
3561 rq->sadb_x_ipsecrequest_mode = mode;
3562 rq->sadb_x_ipsecrequest_level = level;
3563 rq->sadb_x_ipsecrequest_reqid = reqid;
3564
3565 switch (family) {
3566 case AF_INET:
3567 sin = (struct sockaddr_in *)(rq + 1);
3568 sin->sin_family = AF_INET;
3569 memcpy(&sin->sin_addr.s_addr, src,
3570 sizeof(sin->sin_addr.s_addr));
3571 sin++;
3572 sin->sin_family = AF_INET;
3573 memcpy(&sin->sin_addr.s_addr, dst,
3574 sizeof(sin->sin_addr.s_addr));
3575 break;
3576 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3577 case AF_INET6:
3578 sin6 = (struct sockaddr_in6 *)(rq + 1);
3579 sin6->sin6_family = AF_INET6;
3580 sin6->sin6_port = 0;
3581 sin6->sin6_flowinfo = 0;
3582 sin6->sin6_scope_id = 0;
3583 memcpy(&sin6->sin6_addr.s6_addr, src,
3584 sizeof(sin6->sin6_addr.s6_addr));
3585 sin6++;
3586 sin6->sin6_family = AF_INET6;
3587 sin6->sin6_port = 0;
3588 sin6->sin6_flowinfo = 0;
3589 sin6->sin6_scope_id = 0;
3590 memcpy(&sin6->sin6_addr.s6_addr, dst,
3591 sizeof(sin6->sin6_addr.s6_addr));
3592 break;
3593 #endif
3594 default:
3595 return -EINVAL;
3596 }
3597
3598 return 0;
3599 }
3600 #endif
3601
3602 #ifdef CONFIG_NET_KEY_MIGRATE
3603 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3604 struct xfrm_migrate *m, int num_bundles)
3605 {
3606 int i;
3607 int sasize_sel;
3608 int size = 0;
3609 int size_pol = 0;
3610 struct sk_buff *skb;
3611 struct sadb_msg *hdr;
3612 struct sadb_x_policy *pol;
3613 struct xfrm_migrate *mp;
3614
3615 if (type != XFRM_POLICY_TYPE_MAIN)
3616 return 0;
3617
3618 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3619 return -EINVAL;
3620
3621 /* selector */
3622 sasize_sel = pfkey_sockaddr_size(sel->family);
3623 if (!sasize_sel)
3624 return -EINVAL;
3625 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3626
3627 /* policy info */
3628 size_pol += sizeof(struct sadb_x_policy);
3629
3630 /* ipsecrequests */
3631 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3632 /* old locator pair */
3633 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3634 pfkey_sockaddr_pair_size(mp->old_family);
3635 /* new locator pair */
3636 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3637 pfkey_sockaddr_pair_size(mp->new_family);
3638 }
3639
3640 size += sizeof(struct sadb_msg) + size_pol;
3641
3642 /* alloc buffer */
3643 skb = alloc_skb(size, GFP_ATOMIC);
3644 if (skb == NULL)
3645 return -ENOMEM;
3646
3647 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3648 hdr->sadb_msg_version = PF_KEY_V2;
3649 hdr->sadb_msg_type = SADB_X_MIGRATE;
3650 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3651 hdr->sadb_msg_len = size / 8;
3652 hdr->sadb_msg_errno = 0;
3653 hdr->sadb_msg_reserved = 0;
3654 hdr->sadb_msg_seq = 0;
3655 hdr->sadb_msg_pid = 0;
3656
3657 /* selector src */
3658 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3659
3660 /* selector dst */
3661 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3662
3663 /* policy information */
3664 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3665 pol->sadb_x_policy_len = size_pol / 8;
3666 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3667 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3668 pol->sadb_x_policy_dir = dir + 1;
3669 pol->sadb_x_policy_id = 0;
3670 pol->sadb_x_policy_priority = 0;
3671
3672 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3673 /* old ipsecrequest */
3674 int mode = pfkey_mode_from_xfrm(mp->mode);
3675 if (mode < 0)
3676 goto err;
3677 if (set_ipsecrequest(skb, mp->proto, mode,
3678 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3679 mp->reqid, mp->old_family,
3680 &mp->old_saddr, &mp->old_daddr) < 0)
3681 goto err;
3682
3683 /* new ipsecrequest */
3684 if (set_ipsecrequest(skb, mp->proto, mode,
3685 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3686 mp->reqid, mp->new_family,
3687 &mp->new_saddr, &mp->new_daddr) < 0)
3688 goto err;
3689 }
3690
3691 /* broadcast migrate message to sockets */
3692 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3693
3694 return 0;
3695
3696 err:
3697 kfree_skb(skb);
3698 return -EINVAL;
3699 }
3700 #else
3701 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3702 struct xfrm_migrate *m, int num_bundles)
3703 {
3704 return -ENOPROTOOPT;
3705 }
3706 #endif
3707
3708 static int pfkey_sendmsg(struct kiocb *kiocb,
3709 struct socket *sock, struct msghdr *msg, size_t len)
3710 {
3711 struct sock *sk = sock->sk;
3712 struct sk_buff *skb = NULL;
3713 struct sadb_msg *hdr = NULL;
3714 int err;
3715
3716 err = -EOPNOTSUPP;
3717 if (msg->msg_flags & MSG_OOB)
3718 goto out;
3719
3720 err = -EMSGSIZE;
3721 if ((unsigned)len > sk->sk_sndbuf - 32)
3722 goto out;
3723
3724 err = -ENOBUFS;
3725 skb = alloc_skb(len, GFP_KERNEL);
3726 if (skb == NULL)
3727 goto out;
3728
3729 err = -EFAULT;
3730 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3731 goto out;
3732
3733 hdr = pfkey_get_base_msg(skb, &err);
3734 if (!hdr)
3735 goto out;
3736
3737 mutex_lock(&xfrm_cfg_mutex);
3738 err = pfkey_process(sk, skb, hdr);
3739 mutex_unlock(&xfrm_cfg_mutex);
3740
3741 out:
3742 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3743 err = 0;
3744 if (skb)
3745 kfree_skb(skb);
3746
3747 return err ? : len;
3748 }
3749
3750 static int pfkey_recvmsg(struct kiocb *kiocb,
3751 struct socket *sock, struct msghdr *msg, size_t len,
3752 int flags)
3753 {
3754 struct sock *sk = sock->sk;
3755 struct pfkey_sock *pfk = pfkey_sk(sk);
3756 struct sk_buff *skb;
3757 int copied, err;
3758
3759 err = -EINVAL;
3760 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3761 goto out;
3762
3763 msg->msg_namelen = 0;
3764 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3765 if (skb == NULL)
3766 goto out;
3767
3768 copied = skb->len;
3769 if (copied > len) {
3770 msg->msg_flags |= MSG_TRUNC;
3771 copied = len;
3772 }
3773
3774 skb_reset_transport_header(skb);
3775 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3776 if (err)
3777 goto out_free;
3778
3779 sock_recv_timestamp(msg, sk, skb);
3780
3781 err = (flags & MSG_TRUNC) ? skb->len : copied;
3782
3783 if (pfk->dump.dump != NULL &&
3784 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3785 pfkey_do_dump(pfk);
3786
3787 out_free:
3788 skb_free_datagram(sk, skb);
3789 out:
3790 return err;
3791 }
3792
3793 static const struct proto_ops pfkey_ops = {
3794 .family = PF_KEY,
3795 .owner = THIS_MODULE,
3796 /* Operations that make no sense on pfkey sockets. */
3797 .bind = sock_no_bind,
3798 .connect = sock_no_connect,
3799 .socketpair = sock_no_socketpair,
3800 .accept = sock_no_accept,
3801 .getname = sock_no_getname,
3802 .ioctl = sock_no_ioctl,
3803 .listen = sock_no_listen,
3804 .shutdown = sock_no_shutdown,
3805 .setsockopt = sock_no_setsockopt,
3806 .getsockopt = sock_no_getsockopt,
3807 .mmap = sock_no_mmap,
3808 .sendpage = sock_no_sendpage,
3809
3810 /* Now the operations that really occur. */
3811 .release = pfkey_release,
3812 .poll = datagram_poll,
3813 .sendmsg = pfkey_sendmsg,
3814 .recvmsg = pfkey_recvmsg,
3815 };
3816
3817 static struct net_proto_family pfkey_family_ops = {
3818 .family = PF_KEY,
3819 .create = pfkey_create,
3820 .owner = THIS_MODULE,
3821 };
3822
3823 #ifdef CONFIG_PROC_FS
3824 static int pfkey_seq_show(struct seq_file *f, void *v)
3825 {
3826 struct sock *s;
3827
3828 s = (struct sock *)v;
3829 if (v == SEQ_START_TOKEN)
3830 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3831 else
3832 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3833 s,
3834 atomic_read(&s->sk_refcnt),
3835 atomic_read(&s->sk_rmem_alloc),
3836 atomic_read(&s->sk_wmem_alloc),
3837 sock_i_uid(s),
3838 sock_i_ino(s)
3839 );
3840 return 0;
3841 }
3842
3843 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3844 {
3845 struct sock *s;
3846 struct hlist_node *node;
3847 loff_t pos = *ppos;
3848
3849 read_lock(&pfkey_table_lock);
3850 if (pos == 0)
3851 return SEQ_START_TOKEN;
3852
3853 sk_for_each(s, node, &pfkey_table)
3854 if (pos-- == 1)
3855 return s;
3856
3857 return NULL;
3858 }
3859
3860 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3861 {
3862 ++*ppos;
3863 return (v == SEQ_START_TOKEN) ?
3864 sk_head(&pfkey_table) :
3865 sk_next((struct sock *)v);
3866 }
3867
3868 static void pfkey_seq_stop(struct seq_file *f, void *v)
3869 {
3870 read_unlock(&pfkey_table_lock);
3871 }
3872
3873 static struct seq_operations pfkey_seq_ops = {
3874 .start = pfkey_seq_start,
3875 .next = pfkey_seq_next,
3876 .stop = pfkey_seq_stop,
3877 .show = pfkey_seq_show,
3878 };
3879
3880 static int pfkey_seq_open(struct inode *inode, struct file *file)
3881 {
3882 return seq_open(file, &pfkey_seq_ops);
3883 }
3884
3885 static struct file_operations pfkey_proc_ops = {
3886 .open = pfkey_seq_open,
3887 .read = seq_read,
3888 .llseek = seq_lseek,
3889 .release = seq_release,
3890 };
3891
3892 static int pfkey_init_proc(void)
3893 {
3894 struct proc_dir_entry *e;
3895
3896 e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3897 if (e == NULL)
3898 return -ENOMEM;
3899
3900 return 0;
3901 }
3902
3903 static void pfkey_exit_proc(void)
3904 {
3905 proc_net_remove(&init_net, "pfkey");
3906 }
3907 #else
3908 static inline int pfkey_init_proc(void)
3909 {
3910 return 0;
3911 }
3912
3913 static inline void pfkey_exit_proc(void)
3914 {
3915 }
3916 #endif
3917
3918 static struct xfrm_mgr pfkeyv2_mgr =
3919 {
3920 .id = "pfkeyv2",
3921 .notify = pfkey_send_notify,
3922 .acquire = pfkey_send_acquire,
3923 .compile_policy = pfkey_compile_policy,
3924 .new_mapping = pfkey_send_new_mapping,
3925 .notify_policy = pfkey_send_policy_notify,
3926 .migrate = pfkey_send_migrate,
3927 };
3928
3929 static void __exit ipsec_pfkey_exit(void)
3930 {
3931 xfrm_unregister_km(&pfkeyv2_mgr);
3932 pfkey_exit_proc();
3933 sock_unregister(PF_KEY);
3934 proto_unregister(&key_proto);
3935 }
3936
3937 static int __init ipsec_pfkey_init(void)
3938 {
3939 int err = proto_register(&key_proto, 0);
3940
3941 if (err != 0)
3942 goto out;
3943
3944 err = sock_register(&pfkey_family_ops);
3945 if (err != 0)
3946 goto out_unregister_key_proto;
3947 err = pfkey_init_proc();
3948 if (err != 0)
3949 goto out_sock_unregister;
3950 err = xfrm_register_km(&pfkeyv2_mgr);
3951 if (err != 0)
3952 goto out_remove_proc_entry;
3953 out:
3954 return err;
3955 out_remove_proc_entry:
3956 pfkey_exit_proc();
3957 out_sock_unregister:
3958 sock_unregister(PF_KEY);
3959 out_unregister_key_proto:
3960 proto_unregister(&key_proto);
3961 goto out;
3962 }
3963
3964 module_init(ipsec_pfkey_init);
3965 module_exit(ipsec_pfkey_exit);
3966 MODULE_LICENSE("GPL");
3967 MODULE_ALIAS_NETPROTO(PF_KEY);
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