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[mirror_ubuntu-zesty-kernel.git] / net / key / af_key.c
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1da177e4
LT		 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/config.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/xfrm.h>
30
31#include <net/sock.h>
32
33#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
34#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
35
36
37/* List of all pfkey sockets. */
38static HLIST_HEAD(pfkey_table);
39static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
40static DEFINE_RWLOCK(pfkey_table_lock);
41static atomic_t pfkey_table_users = ATOMIC_INIT(0);
42
43static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
44
45struct pfkey_sock {
46 /* struct sock must be the first member of struct pfkey_sock */
47 struct sock sk;
48 int registered;
49 int promisc;
50};
51
52static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
53{
54 return (struct pfkey_sock *)sk;
55}
56
57static void pfkey_sock_destruct(struct sock *sk)
58{
59 skb_queue_purge(&sk->sk_receive_queue);
60
61 if (!sock_flag(sk, SOCK_DEAD)) {
62 printk("Attempt to release alive pfkey socket: %p\n", sk);
63 return;
64 }
65
66 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
67 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
68
69 atomic_dec(&pfkey_socks_nr);
70}
71
72static void pfkey_table_grab(void)
73{
74 write_lock_bh(&pfkey_table_lock);
75
76 if (atomic_read(&pfkey_table_users)) {
77 DECLARE_WAITQUEUE(wait, current);
78
79 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
80 for(;;) {
81 set_current_state(TASK_UNINTERRUPTIBLE);
82 if (atomic_read(&pfkey_table_users) == 0)
83 break;
84 write_unlock_bh(&pfkey_table_lock);
85 schedule();
86 write_lock_bh(&pfkey_table_lock);
87 }
88
89 __set_current_state(TASK_RUNNING);
90 remove_wait_queue(&pfkey_table_wait, &wait);
91 }
92}
93
94static __inline__ void pfkey_table_ungrab(void)
95{
96 write_unlock_bh(&pfkey_table_lock);
97 wake_up(&pfkey_table_wait);
98}
99
100static __inline__ void pfkey_lock_table(void)
101{
102 /* read_lock() synchronizes us to pfkey_table_grab */
103
104 read_lock(&pfkey_table_lock);
105 atomic_inc(&pfkey_table_users);
106 read_unlock(&pfkey_table_lock);
107}
108
109static __inline__ void pfkey_unlock_table(void)
110{
111 if (atomic_dec_and_test(&pfkey_table_users))
112 wake_up(&pfkey_table_wait);
113}
114
115
90ddc4f0 116static const struct proto_ops pfkey_ops;
1da177e4
LT		 117
118static void pfkey_insert(struct sock *sk)
119{
120 pfkey_table_grab();
121 sk_add_node(sk, &pfkey_table);
122 pfkey_table_ungrab();
123}
124
125static void pfkey_remove(struct sock *sk)
126{
127 pfkey_table_grab();
128 sk_del_node_init(sk);
129 pfkey_table_ungrab();
130}
131
132static struct proto key_proto = {
133 .name = "KEY",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct pfkey_sock),
136};
137
138static int pfkey_create(struct socket *sock, int protocol)
139{
140 struct sock *sk;
141 int err;
142
143 if (!capable(CAP_NET_ADMIN))
144 return -EPERM;
145 if (sock->type != SOCK_RAW)
146 return -ESOCKTNOSUPPORT;
147 if (protocol != PF_KEY_V2)
148 return -EPROTONOSUPPORT;
149
150 err = -ENOMEM;
151 sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1);
152 if (sk == NULL)
153 goto out;
154
155 sock->ops = &pfkey_ops;
156 sock_init_data(sock, sk);
157
158 sk->sk_family = PF_KEY;
159 sk->sk_destruct = pfkey_sock_destruct;
160
161 atomic_inc(&pfkey_socks_nr);
162
163 pfkey_insert(sk);
164
165 return 0;
166out:
167 return err;
168}
169
170static int pfkey_release(struct socket *sock)
171{
172 struct sock *sk = sock->sk;
173
174 if (!sk)
175 return 0;
176
177 pfkey_remove(sk);
178
179 sock_orphan(sk);
180 sock->sk = NULL;
181 skb_queue_purge(&sk->sk_write_queue);
182 sock_put(sk);
183
184 return 0;
185}
186
187static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
dd0fc66f 188 gfp_t allocation, struct sock *sk)
1da177e4
LT		 189{
190 int err = -ENOBUFS;
191
192 sock_hold(sk);
193 if (*skb2 == NULL) {
194 if (atomic_read(&skb->users) != 1) {
195 *skb2 = skb_clone(skb, allocation);
196 } else {
197 *skb2 = skb;
198 atomic_inc(&skb->users);
199 }
200 }
201 if (*skb2 != NULL) {
202 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
203 skb_orphan(*skb2);
204 skb_set_owner_r(*skb2, sk);
205 skb_queue_tail(&sk->sk_receive_queue, *skb2);
206 sk->sk_data_ready(sk, (*skb2)->len);
207 *skb2 = NULL;
208 err = 0;
209 }
210 }
211 sock_put(sk);
212 return err;
213}
214
215/* Send SKB to all pfkey sockets matching selected criteria. */
216#define BROADCAST_ALL 0
217#define BROADCAST_ONE 1
218#define BROADCAST_REGISTERED 2
219#define BROADCAST_PROMISC_ONLY 4
dd0fc66f 220static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
1da177e4
LT		 221 int broadcast_flags, struct sock *one_sk)
222{
223 struct sock *sk;
224 struct hlist_node *node;
225 struct sk_buff *skb2 = NULL;
226 int err = -ESRCH;
227
228 /* XXX Do we need something like netlink_overrun? I think
229 * XXX PF_KEY socket apps will not mind current behavior.
230 */
231 if (!skb)
232 return -ENOMEM;
233
234 pfkey_lock_table();
235 sk_for_each(sk, node, &pfkey_table) {
236 struct pfkey_sock *pfk = pfkey_sk(sk);
237 int err2;
238
239 /* Yes, it means that if you are meant to receive this
240 * pfkey message you receive it twice as promiscuous
241 * socket.
242 */
243 if (pfk->promisc)
244 pfkey_broadcast_one(skb, &skb2, allocation, sk);
245
246 /* the exact target will be processed later */
247 if (sk == one_sk)
248 continue;
249 if (broadcast_flags != BROADCAST_ALL) {
250 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
251 continue;
252 if ((broadcast_flags & BROADCAST_REGISTERED) &&
253 !pfk->registered)
254 continue;
255 if (broadcast_flags & BROADCAST_ONE)
256 continue;
257 }
258
259 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
260
261 /* Error is cleare after succecful sending to at least one
262 * registered KM */
263 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
264 err = err2;
265 }
266 pfkey_unlock_table();
267
268 if (one_sk != NULL)
269 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
270
271 if (skb2)
272 kfree_skb(skb2);
273 kfree_skb(skb);
274 return err;
275}
276
277static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
278{
279 *new = *orig;
280}
281
282static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
283{
284 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
285 struct sadb_msg *hdr;
286
287 if (!skb)
288 return -ENOBUFS;
289
290 /* Woe be to the platform trying to support PFKEY yet
291 * having normal errnos outside the 1-255 range, inclusive.
292 */
293 err = -err;
294 if (err == ERESTARTSYS ||
295 err == ERESTARTNOHAND ||
296 err == ERESTARTNOINTR)
297 err = EINTR;
298 if (err >= 512)
299 err = EINVAL;
09a62660 300 BUG_ON(err <= 0 || err >= 256);
1da177e4
LT		 301
302 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
303 pfkey_hdr_dup(hdr, orig);
304 hdr->sadb_msg_errno = (uint8_t) err;
305 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
306 sizeof(uint64_t));
307
308 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
309
310 return 0;
311}
312
313static u8 sadb_ext_min_len[] = {
314 [SADB_EXT_RESERVED] = (u8) 0,
315 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
316 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
317 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
318 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
319 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
320 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
321 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
322 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
323 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
324 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
325 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
326 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
327 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
328 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
329 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
330 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
331 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
332 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
333 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
334 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
335 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
336 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
337 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
df71837d 338 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
1da177e4
LT		 339};
340
341/* Verify sadb_address_{len,prefixlen} against sa_family. */
342static int verify_address_len(void *p)
343{
344 struct sadb_address *sp = p;
345 struct sockaddr *addr = (struct sockaddr *)(sp + 1);
346 struct sockaddr_in *sin;
347#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
348 struct sockaddr_in6 *sin6;
349#endif
350 int len;
351
352 switch (addr->sa_family) {
353 case AF_INET:
354 len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1);
355 len /= sizeof(uint64_t);
356 if (sp->sadb_address_len != len ||
357 sp->sadb_address_prefixlen > 32)
358 return -EINVAL;
359 break;
360#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
361 case AF_INET6:
362 len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1);
363 len /= sizeof(uint64_t);
364 if (sp->sadb_address_len != len ||
365 sp->sadb_address_prefixlen > 128)
366 return -EINVAL;
367 break;
368#endif
369 default:
370 /* It is user using kernel to keep track of security
371 * associations for another protocol, such as
372 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
373 * lengths.
374 *
375 * XXX Actually, association/policy database is not yet
376 * XXX able to cope with arbitrary sockaddr families.
377 * XXX When it can, remove this -EINVAL. -DaveM
378 */
379 return -EINVAL;
380 break;
381 };
382
383 return 0;
384}
385
df71837d
TJ		 386static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
387{
388 int len = 0;
389
390 len += sizeof(struct sadb_x_sec_ctx);
391 len += sec_ctx->sadb_x_ctx_len;
392 len += sizeof(uint64_t) - 1;
393 len /= sizeof(uint64_t);
394
395 return len;
396}
397
398static inline int verify_sec_ctx_len(void *p)
399{
400 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
401 int len;
402
403 if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE)
404 return -EINVAL;
405
406 len = pfkey_sec_ctx_len(sec_ctx);
407
408 if (sec_ctx->sadb_x_sec_len != len)
409 return -EINVAL;
410
411 return 0;
412}
413
414static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
415{
416 struct xfrm_user_sec_ctx *uctx = NULL;
417 int ctx_size = sec_ctx->sadb_x_ctx_len;
418
419 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
420
421 if (!uctx)
422 return NULL;
423
424 uctx->len = pfkey_sec_ctx_len(sec_ctx);
425 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
426 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
427 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
428 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
429 memcpy(uctx + 1, sec_ctx + 1,
430 uctx->ctx_len);
431
432 return uctx;
433}
434
1da177e4
LT		 435static int present_and_same_family(struct sadb_address *src,
436 struct sadb_address *dst)
437{
438 struct sockaddr *s_addr, *d_addr;
439
440 if (!src || !dst)
441 return 0;
442
443 s_addr = (struct sockaddr *)(src + 1);
444 d_addr = (struct sockaddr *)(dst + 1);
445 if (s_addr->sa_family != d_addr->sa_family)
446 return 0;
447 if (s_addr->sa_family != AF_INET
448#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
449 && s_addr->sa_family != AF_INET6
450#endif
451 )
452 return 0;
453
454 return 1;
455}
456
457static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
458{
459 char *p = (char *) hdr;
460 int len = skb->len;
461
462 len -= sizeof(*hdr);
463 p += sizeof(*hdr);
464 while (len > 0) {
465 struct sadb_ext *ehdr = (struct sadb_ext *) p;
466 uint16_t ext_type;
467 int ext_len;
468
469 ext_len = ehdr->sadb_ext_len;
470 ext_len *= sizeof(uint64_t);
471 ext_type = ehdr->sadb_ext_type;
472 if (ext_len < sizeof(uint64_t) ||
473 ext_len > len ||
474 ext_type == SADB_EXT_RESERVED)
475 return -EINVAL;
476
477 if (ext_type <= SADB_EXT_MAX) {
478 int min = (int) sadb_ext_min_len[ext_type];
479 if (ext_len < min)
480 return -EINVAL;
481 if (ext_hdrs[ext_type-1] != NULL)
482 return -EINVAL;
483 if (ext_type == SADB_EXT_ADDRESS_SRC ||
484 ext_type == SADB_EXT_ADDRESS_DST ||
485 ext_type == SADB_EXT_ADDRESS_PROXY ||
486 ext_type == SADB_X_EXT_NAT_T_OA) {
487 if (verify_address_len(p))
488 return -EINVAL;
489 }
df71837d
TJ		 490 if (ext_type == SADB_X_EXT_SEC_CTX) {
491 if (verify_sec_ctx_len(p))
492 return -EINVAL;
493 }
1da177e4
LT		 494 ext_hdrs[ext_type-1] = p;
495 }
496 p += ext_len;
497 len -= ext_len;
498 }
499
500 return 0;
501}
502
503static uint16_t
504pfkey_satype2proto(uint8_t satype)
505{
506 switch (satype) {
507 case SADB_SATYPE_UNSPEC:
508 return IPSEC_PROTO_ANY;
509 case SADB_SATYPE_AH:
510 return IPPROTO_AH;
511 case SADB_SATYPE_ESP:
512 return IPPROTO_ESP;
513 case SADB_X_SATYPE_IPCOMP:
514 return IPPROTO_COMP;
515 break;
516 default:
517 return 0;
518 }
519 /* NOTREACHED */
520}
521
522static uint8_t
523pfkey_proto2satype(uint16_t proto)
524{
525 switch (proto) {
526 case IPPROTO_AH:
527 return SADB_SATYPE_AH;
528 case IPPROTO_ESP:
529 return SADB_SATYPE_ESP;
530 case IPPROTO_COMP:
531 return SADB_X_SATYPE_IPCOMP;
532 break;
533 default:
534 return 0;
535 }
536 /* NOTREACHED */
537}
538
539/* BTW, this scheme means that there is no way with PFKEY2 sockets to
540 * say specifically 'just raw sockets' as we encode them as 255.
541 */
542
543static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
544{
545 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
546}
547
548static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
549{
550 return (proto ? proto : IPSEC_PROTO_ANY);
551}
552
553static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
554 xfrm_address_t *xaddr)
555{
556 switch (((struct sockaddr*)(addr + 1))->sa_family) {
557 case AF_INET:
558 xaddr->a4 =
559 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
560 return AF_INET;
561#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
562 case AF_INET6:
563 memcpy(xaddr->a6,
564 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
565 sizeof(struct in6_addr));
566 return AF_INET6;
567#endif
568 default:
569 return 0;
570 }
571 /* NOTREACHED */
572}
573
574static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
575{
576 struct sadb_sa *sa;
577 struct sadb_address *addr;
578 uint16_t proto;
579 unsigned short family;
580 xfrm_address_t *xaddr;
581
582 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
583 if (sa == NULL)
584 return NULL;
585
586 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
587 if (proto == 0)
588 return NULL;
589
590 /* sadb_address_len should be checked by caller */
591 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
592 if (addr == NULL)
593 return NULL;
594
595 family = ((struct sockaddr *)(addr + 1))->sa_family;
596 switch (family) {
597 case AF_INET:
598 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
599 break;
600#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
601 case AF_INET6:
602 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
603 break;
604#endif
605 default:
606 xaddr = NULL;
607 }
608
609 if (!xaddr)
610 return NULL;
611
612 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
613}
614
615#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
616static int
617pfkey_sockaddr_size(sa_family_t family)
618{
619 switch (family) {
620 case AF_INET:
621 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
622#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
623 case AF_INET6:
624 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
625#endif
626 default:
627 return 0;
628 }
629 /* NOTREACHED */
630}
631
632static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
633{
634 struct sk_buff *skb;
635 struct sadb_msg *hdr;
636 struct sadb_sa *sa;
637 struct sadb_lifetime *lifetime;
638 struct sadb_address *addr;
639 struct sadb_key *key;
640 struct sadb_x_sa2 *sa2;
641 struct sockaddr_in *sin;
df71837d
TJ		 642 struct sadb_x_sec_ctx *sec_ctx;
643 struct xfrm_sec_ctx *xfrm_ctx;
644 int ctx_size = 0;
1da177e4
LT		 645#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
646 struct sockaddr_in6 *sin6;
647#endif
648 int size;
649 int auth_key_size = 0;
650 int encrypt_key_size = 0;
651 int sockaddr_size;
652 struct xfrm_encap_tmpl *natt = NULL;
653
654 /* address family check */
655 sockaddr_size = pfkey_sockaddr_size(x->props.family);
656 if (!sockaddr_size)
657 return ERR_PTR(-EINVAL);
658
659 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
660 key(AE), (identity(SD),) (sensitivity)> */
661 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
662 sizeof(struct sadb_lifetime) +
663 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
664 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
665 sizeof(struct sadb_address)*2 +
666 sockaddr_size*2 +
667 sizeof(struct sadb_x_sa2);
df71837d
TJ		 668
669 if ((xfrm_ctx = x->security)) {
670 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
671 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
672 }
673
1da177e4
LT		 674 /* identity & sensitivity */
675
676 if ((x->props.family == AF_INET &&
677 x->sel.saddr.a4 != x->props.saddr.a4)
678#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
679 || (x->props.family == AF_INET6 &&
680 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
681#endif
682 )
683 size += sizeof(struct sadb_address) + sockaddr_size;
684
685 if (add_keys) {
686 if (x->aalg && x->aalg->alg_key_len) {
687 auth_key_size =
688 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
689 size += sizeof(struct sadb_key) + auth_key_size;
690 }
691 if (x->ealg && x->ealg->alg_key_len) {
692 encrypt_key_size =
693 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
694 size += sizeof(struct sadb_key) + encrypt_key_size;
695 }
696 }
697 if (x->encap)
698 natt = x->encap;
699
700 if (natt && natt->encap_type) {
701 size += sizeof(struct sadb_x_nat_t_type);
702 size += sizeof(struct sadb_x_nat_t_port);
703 size += sizeof(struct sadb_x_nat_t_port);
704 }
705
706 skb = alloc_skb(size + 16, GFP_ATOMIC);
707 if (skb == NULL)
708 return ERR_PTR(-ENOBUFS);
709
710 /* call should fill header later */
711 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
712 memset(hdr, 0, size); /* XXX do we need this ? */
713 hdr->sadb_msg_len = size / sizeof(uint64_t);
714
715 /* sa */
716 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
717 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
718 sa->sadb_sa_exttype = SADB_EXT_SA;
719 sa->sadb_sa_spi = x->id.spi;
720 sa->sadb_sa_replay = x->props.replay_window;
4f09f0bb
HX		 721 switch (x->km.state) {
722 case XFRM_STATE_VALID:
723 sa->sadb_sa_state = x->km.dying ?
724 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
725 break;
726 case XFRM_STATE_ACQ:
1da177e4 727 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
4f09f0bb
HX		 728 break;
729 default:
1da177e4 730 sa->sadb_sa_state = SADB_SASTATE_DEAD;
4f09f0bb
HX		 731 break;
732 }
1da177e4
LT		 733 sa->sadb_sa_auth = 0;
734 if (x->aalg) {
735 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
736 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
737 }
738 sa->sadb_sa_encrypt = 0;
739 BUG_ON(x->ealg && x->calg);
740 if (x->ealg) {
741 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
742 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
743 }
744 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
745 if (x->calg) {
746 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
747 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
748 }
749
750 sa->sadb_sa_flags = 0;
751 if (x->props.flags & XFRM_STATE_NOECN)
752 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
753 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
754 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
dd87147e
HX		 755 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
756 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
1da177e4
LT		 757
758 /* hard time */
759 if (hsc & 2) {
760 lifetime = (struct sadb_lifetime *) skb_put(skb,
761 sizeof(struct sadb_lifetime));
762 lifetime->sadb_lifetime_len =
763 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
764 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
765 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
766 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
767 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
768 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
769 }
770 /* soft time */
771 if (hsc & 1) {
772 lifetime = (struct sadb_lifetime *) skb_put(skb,
773 sizeof(struct sadb_lifetime));
774 lifetime->sadb_lifetime_len =
775 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
776 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
777 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
778 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
779 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
780 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
781 }
782 /* current time */
783 lifetime = (struct sadb_lifetime *) skb_put(skb,
784 sizeof(struct sadb_lifetime));
785 lifetime->sadb_lifetime_len =
786 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
787 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
788 lifetime->sadb_lifetime_allocations = x->curlft.packets;
789 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
790 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
791 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
792 /* src address */
793 addr = (struct sadb_address*) skb_put(skb,
794 sizeof(struct sadb_address)+sockaddr_size);
795 addr->sadb_address_len =
796 (sizeof(struct sadb_address)+sockaddr_size)/
797 sizeof(uint64_t);
798 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
799 /* "if the ports are non-zero, then the sadb_address_proto field,
800 normally zero, MUST be filled in with the transport
801 protocol's number." - RFC2367 */
802 addr->sadb_address_proto = 0;
803 addr->sadb_address_reserved = 0;
804 if (x->props.family == AF_INET) {
805 addr->sadb_address_prefixlen = 32;
806
807 sin = (struct sockaddr_in *) (addr + 1);
808 sin->sin_family = AF_INET;
809 sin->sin_addr.s_addr = x->props.saddr.a4;
810 sin->sin_port = 0;
811 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
812 }
813#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
814 else if (x->props.family == AF_INET6) {
815 addr->sadb_address_prefixlen = 128;
816
817 sin6 = (struct sockaddr_in6 *) (addr + 1);
818 sin6->sin6_family = AF_INET6;
819 sin6->sin6_port = 0;
820 sin6->sin6_flowinfo = 0;
821 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
822 sizeof(struct in6_addr));
823 sin6->sin6_scope_id = 0;
824 }
825#endif
826 else
827 BUG();
828
829 /* dst address */
830 addr = (struct sadb_address*) skb_put(skb,
831 sizeof(struct sadb_address)+sockaddr_size);
832 addr->sadb_address_len =
833 (sizeof(struct sadb_address)+sockaddr_size)/
834 sizeof(uint64_t);
835 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
836 addr->sadb_address_proto = 0;
837 addr->sadb_address_prefixlen = 32; /* XXX */
838 addr->sadb_address_reserved = 0;
839 if (x->props.family == AF_INET) {
840 sin = (struct sockaddr_in *) (addr + 1);
841 sin->sin_family = AF_INET;
842 sin->sin_addr.s_addr = x->id.daddr.a4;
843 sin->sin_port = 0;
844 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
845
846 if (x->sel.saddr.a4 != x->props.saddr.a4) {
847 addr = (struct sadb_address*) skb_put(skb,
848 sizeof(struct sadb_address)+sockaddr_size);
849 addr->sadb_address_len =
850 (sizeof(struct sadb_address)+sockaddr_size)/
851 sizeof(uint64_t);
852 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
853 addr->sadb_address_proto =
854 pfkey_proto_from_xfrm(x->sel.proto);
855 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
856 addr->sadb_address_reserved = 0;
857
858 sin = (struct sockaddr_in *) (addr + 1);
859 sin->sin_family = AF_INET;
860 sin->sin_addr.s_addr = x->sel.saddr.a4;
861 sin->sin_port = x->sel.sport;
862 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
863 }
864 }
865#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
866 else if (x->props.family == AF_INET6) {
867 addr->sadb_address_prefixlen = 128;
868
869 sin6 = (struct sockaddr_in6 *) (addr + 1);
870 sin6->sin6_family = AF_INET6;
871 sin6->sin6_port = 0;
872 sin6->sin6_flowinfo = 0;
873 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
874 sin6->sin6_scope_id = 0;
875
876 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
877 sizeof(struct in6_addr))) {
878 addr = (struct sadb_address *) skb_put(skb,
879 sizeof(struct sadb_address)+sockaddr_size);
880 addr->sadb_address_len =
881 (sizeof(struct sadb_address)+sockaddr_size)/
882 sizeof(uint64_t);
883 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
884 addr->sadb_address_proto =
885 pfkey_proto_from_xfrm(x->sel.proto);
886 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
887 addr->sadb_address_reserved = 0;
888
889 sin6 = (struct sockaddr_in6 *) (addr + 1);
890 sin6->sin6_family = AF_INET6;
891 sin6->sin6_port = x->sel.sport;
892 sin6->sin6_flowinfo = 0;
893 memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
894 sizeof(struct in6_addr));
895 sin6->sin6_scope_id = 0;
896 }
897 }
898#endif
899 else
900 BUG();
901
902 /* auth key */
903 if (add_keys && auth_key_size) {
904 key = (struct sadb_key *) skb_put(skb,
905 sizeof(struct sadb_key)+auth_key_size);
906 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
907 sizeof(uint64_t);
908 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
909 key->sadb_key_bits = x->aalg->alg_key_len;
910 key->sadb_key_reserved = 0;
911 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
912 }
913 /* encrypt key */
914 if (add_keys && encrypt_key_size) {
915 key = (struct sadb_key *) skb_put(skb,
916 sizeof(struct sadb_key)+encrypt_key_size);
917 key->sadb_key_len = (sizeof(struct sadb_key) +
918 encrypt_key_size) / sizeof(uint64_t);
919 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
920 key->sadb_key_bits = x->ealg->alg_key_len;
921 key->sadb_key_reserved = 0;
922 memcpy(key + 1, x->ealg->alg_key,
923 (x->ealg->alg_key_len+7)/8);
924 }
925
926 /* sa */
927 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
928 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
929 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
930 sa2->sadb_x_sa2_mode = x->props.mode + 1;
931 sa2->sadb_x_sa2_reserved1 = 0;
932 sa2->sadb_x_sa2_reserved2 = 0;
933 sa2->sadb_x_sa2_sequence = 0;
934 sa2->sadb_x_sa2_reqid = x->props.reqid;
935
936 if (natt && natt->encap_type) {
937 struct sadb_x_nat_t_type *n_type;
938 struct sadb_x_nat_t_port *n_port;
939
940 /* type */
941 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
942 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
943 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
944 n_type->sadb_x_nat_t_type_type = natt->encap_type;
945 n_type->sadb_x_nat_t_type_reserved[0] = 0;
946 n_type->sadb_x_nat_t_type_reserved[1] = 0;
947 n_type->sadb_x_nat_t_type_reserved[2] = 0;
948
949 /* source port */
950 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
951 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
952 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
953 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
954 n_port->sadb_x_nat_t_port_reserved = 0;
955
956 /* dest port */
957 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
958 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
959 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
960 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
961 n_port->sadb_x_nat_t_port_reserved = 0;
962 }
963
df71837d
TJ		 964 /* security context */
965 if (xfrm_ctx) {
966 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
967 sizeof(struct sadb_x_sec_ctx) + ctx_size);
968 sec_ctx->sadb_x_sec_len =
969 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
970 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
971 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
972 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
973 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
974 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
975 xfrm_ctx->ctx_len);
976 }
977
1da177e4
LT		 978 return skb;
979}
980
981static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
982 void **ext_hdrs)
983{
984 struct xfrm_state *x;
985 struct sadb_lifetime *lifetime;
986 struct sadb_sa *sa;
987 struct sadb_key *key;
df71837d 988 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 989 uint16_t proto;
990 int err;
991
992
993 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
994 if (!sa ||
995 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
996 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
997 return ERR_PTR(-EINVAL);
998 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
999 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1000 return ERR_PTR(-EINVAL);
1001 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1002 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1003 return ERR_PTR(-EINVAL);
1004 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1005 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1006 return ERR_PTR(-EINVAL);
1007
1008 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1009 if (proto == 0)
1010 return ERR_PTR(-EINVAL);
1011
1012 /* default error is no buffer space */
1013 err = -ENOBUFS;
1014
1015 /* RFC2367:
1016
1017 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1018 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1019 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1020 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1021 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1022 not true.
1023
1024 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1025 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1026 */
1027 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1028 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1029 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1030 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1031 return ERR_PTR(-EINVAL);
1032 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1033 if (key != NULL &&
1034 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1035 ((key->sadb_key_bits+7) / 8 == 0 ||
1036 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1037 return ERR_PTR(-EINVAL);
1038 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1039 if (key != NULL &&
1040 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1041 ((key->sadb_key_bits+7) / 8 == 0 ||
1042 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1043 return ERR_PTR(-EINVAL);
1044
1045 x = xfrm_state_alloc();
1046 if (x == NULL)
1047 return ERR_PTR(-ENOBUFS);
1048
1049 x->id.proto = proto;
1050 x->id.spi = sa->sadb_sa_spi;
1051 x->props.replay_window = sa->sadb_sa_replay;
1052 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1053 x->props.flags |= XFRM_STATE_NOECN;
1054 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1055 x->props.flags |= XFRM_STATE_DECAP_DSCP;
dd87147e
HX		 1056 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1057 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1da177e4
LT		 1058
1059 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1060 if (lifetime != NULL) {
1061 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1062 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1063 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1064 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1065 }
1066 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1067 if (lifetime != NULL) {
1068 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1069 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1070 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1071 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1072 }
df71837d
TJ		 1073
1074 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1075 if (sec_ctx != NULL) {
1076 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1077
1078 if (!uctx)
1079 goto out;
1080
1081 err = security_xfrm_state_alloc(x, uctx);
1082 kfree(uctx);
1083
1084 if (err)
1085 goto out;
1086 }
1087
1da177e4
LT		 1088 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1089 if (sa->sadb_sa_auth) {
1090 int keysize = 0;
1091 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1092 if (!a) {
1093 err = -ENOSYS;
1094 goto out;
1095 }
1096 if (key)
1097 keysize = (key->sadb_key_bits + 7) / 8;
1098 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1099 if (!x->aalg)
1100 goto out;
1101 strcpy(x->aalg->alg_name, a->name);
1102 x->aalg->alg_key_len = 0;
1103 if (key) {
1104 x->aalg->alg_key_len = key->sadb_key_bits;
1105 memcpy(x->aalg->alg_key, key+1, keysize);
1106 }
1107 x->props.aalgo = sa->sadb_sa_auth;
1108 /* x->algo.flags = sa->sadb_sa_flags; */
1109 }
1110 if (sa->sadb_sa_encrypt) {
1111 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1112 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1113 if (!a) {
1114 err = -ENOSYS;
1115 goto out;
1116 }
1117 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1118 if (!x->calg)
1119 goto out;
1120 strcpy(x->calg->alg_name, a->name);
1121 x->props.calgo = sa->sadb_sa_encrypt;
1122 } else {
1123 int keysize = 0;
1124 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1125 if (!a) {
1126 err = -ENOSYS;
1127 goto out;
1128 }
1129 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1130 if (key)
1131 keysize = (key->sadb_key_bits + 7) / 8;
1132 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1133 if (!x->ealg)
1134 goto out;
1135 strcpy(x->ealg->alg_name, a->name);
1136 x->ealg->alg_key_len = 0;
1137 if (key) {
1138 x->ealg->alg_key_len = key->sadb_key_bits;
1139 memcpy(x->ealg->alg_key, key+1, keysize);
1140 }
1141 x->props.ealgo = sa->sadb_sa_encrypt;
1142 }
1143 }
1144 /* x->algo.flags = sa->sadb_sa_flags; */
1145
1146 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1147 &x->props.saddr);
1148 if (!x->props.family) {
1149 err = -EAFNOSUPPORT;
1150 goto out;
1151 }
1152 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1153 &x->id.daddr);
1154
1155 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1156 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1157 x->props.mode = sa2->sadb_x_sa2_mode;
1158 if (x->props.mode)
1159 x->props.mode--;
1160 x->props.reqid = sa2->sadb_x_sa2_reqid;
1161 }
1162
1163 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1164 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1165
1166 /* Nobody uses this, but we try. */
1167 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1168 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1169 }
1170
1171 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1172 struct sadb_x_nat_t_type* n_type;
1173 struct xfrm_encap_tmpl *natt;
1174
1175 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1176 if (!x->encap)
1177 goto out;
1178
1179 natt = x->encap;
1180 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1181 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1182
1183 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1184 struct sadb_x_nat_t_port* n_port =
1185 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1186 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1187 }
1188 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1189 struct sadb_x_nat_t_port* n_port =
1190 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1191 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1192 }
1193 }
1194
72cb6962
HX		 1195 err = xfrm_init_state(x);
1196 if (err)
1da177e4 1197 goto out;
72cb6962 1198
1da177e4 1199 x->km.seq = hdr->sadb_msg_seq;
1da177e4
LT		 1200 return x;
1201
1202out:
1203 x->km.state = XFRM_STATE_DEAD;
1204 xfrm_state_put(x);
1205 return ERR_PTR(err);
1206}
1207
1208static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1209{
1210 return -EOPNOTSUPP;
1211}
1212
1213static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1214{
1215 struct sk_buff *resp_skb;
1216 struct sadb_x_sa2 *sa2;
1217 struct sadb_address *saddr, *daddr;
1218 struct sadb_msg *out_hdr;
1219 struct xfrm_state *x = NULL;
1220 u8 mode;
1221 u32 reqid;
1222 u8 proto;
1223 unsigned short family;
1224 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1225
1226 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1227 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1228 return -EINVAL;
1229
1230 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1231 if (proto == 0)
1232 return -EINVAL;
1233
1234 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1235 mode = sa2->sadb_x_sa2_mode - 1;
1236 reqid = sa2->sadb_x_sa2_reqid;
1237 } else {
1238 mode = 0;
1239 reqid = 0;
1240 }
1241
1242 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1243 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1244
1245 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1246 switch (family) {
1247 case AF_INET:
1248 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1249 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1250 break;
1251#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1252 case AF_INET6:
1253 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1254 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1255 break;
1256#endif
1257 }
1258
1259 if (hdr->sadb_msg_seq) {
1260 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1261 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1262 xfrm_state_put(x);
1263 x = NULL;
1264 }
1265 }
1266
1267 if (!x)
1268 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1269
1270 if (x == NULL)
1271 return -ENOENT;
1272
1273 resp_skb = ERR_PTR(-ENOENT);
1274
1275 spin_lock_bh(&x->lock);
1276 if (x->km.state != XFRM_STATE_DEAD) {
1277 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1278 u32 min_spi, max_spi;
1279
1280 if (range != NULL) {
1281 min_spi = range->sadb_spirange_min;
1282 max_spi = range->sadb_spirange_max;
1283 } else {
1284 min_spi = 0x100;
1285 max_spi = 0x0fffffff;
1286 }
1287 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1288 if (x->id.spi)
1289 resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1290 }
1291 spin_unlock_bh(&x->lock);
1292
1293 if (IS_ERR(resp_skb)) {
1294 xfrm_state_put(x);
1295 return PTR_ERR(resp_skb);
1296 }
1297
1298 out_hdr = (struct sadb_msg *) resp_skb->data;
1299 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1300 out_hdr->sadb_msg_type = SADB_GETSPI;
1301 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1302 out_hdr->sadb_msg_errno = 0;
1303 out_hdr->sadb_msg_reserved = 0;
1304 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1305 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1306
1307 xfrm_state_put(x);
1308
1309 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1310
1311 return 0;
1312}
1313
1314static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1315{
1316 struct xfrm_state *x;
1317
1318 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1319 return -EOPNOTSUPP;
1320
1321 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1322 return 0;
1323
1324 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1325 if (x == NULL)
1326 return 0;
1327
1328 spin_lock_bh(&x->lock);
1329 if (x->km.state == XFRM_STATE_ACQ) {
1330 x->km.state = XFRM_STATE_ERROR;
1331 wake_up(&km_waitq);
1332 }
1333 spin_unlock_bh(&x->lock);
1334 xfrm_state_put(x);
1335 return 0;
1336}
1337
26b15dad
JHS		 1338static inline int event2poltype(int event)
1339{
1340 switch (event) {
f60f6b8f 1341 case XFRM_MSG_DELPOLICY:
26b15dad 1342 return SADB_X_SPDDELETE;
f60f6b8f 1343 case XFRM_MSG_NEWPOLICY:
26b15dad 1344 return SADB_X_SPDADD;
f60f6b8f 1345 case XFRM_MSG_UPDPOLICY:
26b15dad 1346 return SADB_X_SPDUPDATE;
f60f6b8f 1347 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 1348 // return SADB_X_SPDEXPIRE;
1349 default:
1350 printk("pfkey: Unknown policy event %d\n", event);
1351 break;
1352 }
1353
1354 return 0;
1355}
1356
1357static inline int event2keytype(int event)
1358{
1359 switch (event) {
f60f6b8f 1360 case XFRM_MSG_DELSA:
26b15dad 1361 return SADB_DELETE;
f60f6b8f 1362 case XFRM_MSG_NEWSA:
26b15dad 1363 return SADB_ADD;
f60f6b8f 1364 case XFRM_MSG_UPDSA:
26b15dad 1365 return SADB_UPDATE;
f60f6b8f 1366 case XFRM_MSG_EXPIRE:
26b15dad
JHS		 1367 return SADB_EXPIRE;
1368 default:
1369 printk("pfkey: Unknown SA event %d\n", event);
1370 break;
1371 }
1372
1373 return 0;
1374}
1375
1376/* ADD/UPD/DEL */
1377static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1378{
1379 struct sk_buff *skb;
1380 struct sadb_msg *hdr;
1381 int hsc = 3;
1382
f60f6b8f 1383 if (c->event == XFRM_MSG_DELSA)
26b15dad
JHS		 1384 hsc = 0;
1385
26b15dad
JHS		 1386 skb = pfkey_xfrm_state2msg(x, 0, hsc);
1387
1388 if (IS_ERR(skb))
1389 return PTR_ERR(skb);
1390
1391 hdr = (struct sadb_msg *) skb->data;
1392 hdr->sadb_msg_version = PF_KEY_V2;
1393 hdr->sadb_msg_type = event2keytype(c->event);
1394 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1395 hdr->sadb_msg_errno = 0;
1396 hdr->sadb_msg_reserved = 0;
1397 hdr->sadb_msg_seq = c->seq;
1398 hdr->sadb_msg_pid = c->pid;
1399
1400 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1401
1402 return 0;
1403}
1da177e4
LT		 1404
1405static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1406{
1da177e4
LT		 1407 struct xfrm_state *x;
1408 int err;
26b15dad 1409 struct km_event c;
1da177e4
LT		 1410
1411 xfrm_probe_algs();
1412
1413 x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1414 if (IS_ERR(x))
1415 return PTR_ERR(x);
1416
26b15dad 1417 xfrm_state_hold(x);
1da177e4
LT		 1418 if (hdr->sadb_msg_type == SADB_ADD)
1419 err = xfrm_state_add(x);
1420 else
1421 err = xfrm_state_update(x);
1422
1423 if (err < 0) {
1424 x->km.state = XFRM_STATE_DEAD;
1425 xfrm_state_put(x);
7d6dfe1f 1426 goto out;
1da177e4
LT		 1427 }
1428
26b15dad 1429 if (hdr->sadb_msg_type == SADB_ADD)
f60f6b8f 1430 c.event = XFRM_MSG_NEWSA;
26b15dad 1431 else
f60f6b8f 1432 c.event = XFRM_MSG_UPDSA;
26b15dad
JHS		 1433 c.seq = hdr->sadb_msg_seq;
1434 c.pid = hdr->sadb_msg_pid;
1435 km_state_notify(x, &c);
7d6dfe1f 1436out:
26b15dad 1437 xfrm_state_put(x);
26b15dad 1438 return err;
1da177e4
LT		 1439}
1440
1441static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1442{
1443 struct xfrm_state *x;
26b15dad
JHS		 1444 struct km_event c;
1445 int err;
1da177e4
LT		 1446
1447 if (!ext_hdrs[SADB_EXT_SA-1] ||
1448 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1449 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1450 return -EINVAL;
1451
1452 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1453 if (x == NULL)
1454 return -ESRCH;
1455
1456 if (xfrm_state_kern(x)) {
1457 xfrm_state_put(x);
1458 return -EPERM;
1459 }
1460
26b15dad
JHS		 1461 err = xfrm_state_delete(x);
1462 if (err < 0) {
1463 xfrm_state_put(x);
1464 return err;
1465 }
1da177e4 1466
26b15dad
JHS		 1467 c.seq = hdr->sadb_msg_seq;
1468 c.pid = hdr->sadb_msg_pid;
f60f6b8f 1469 c.event = XFRM_MSG_DELSA;
26b15dad
JHS		 1470 km_state_notify(x, &c);
1471 xfrm_state_put(x);
1da177e4 1472
26b15dad 1473 return err;
1da177e4
LT		 1474}
1475
1476static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1477{
1478 __u8 proto;
1479 struct sk_buff *out_skb;
1480 struct sadb_msg *out_hdr;
1481 struct xfrm_state *x;
1482
1483 if (!ext_hdrs[SADB_EXT_SA-1] ||
1484 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1485 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1486 return -EINVAL;
1487
1488 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1489 if (x == NULL)
1490 return -ESRCH;
1491
1492 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1493 proto = x->id.proto;
1494 xfrm_state_put(x);
1495 if (IS_ERR(out_skb))
1496 return PTR_ERR(out_skb);
1497
1498 out_hdr = (struct sadb_msg *) out_skb->data;
1499 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1500 out_hdr->sadb_msg_type = SADB_DUMP;
1501 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1502 out_hdr->sadb_msg_errno = 0;
1503 out_hdr->sadb_msg_reserved = 0;
1504 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1505 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1506 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1507
1508 return 0;
1509}
1510
00fa0233 1511static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
dd0fc66f 1512 gfp_t allocation)
1da177e4
LT		 1513{
1514 struct sk_buff *skb;
1515 struct sadb_msg *hdr;
1516 int len, auth_len, enc_len, i;
1517
1518 auth_len = xfrm_count_auth_supported();
1519 if (auth_len) {
1520 auth_len *= sizeof(struct sadb_alg);
1521 auth_len += sizeof(struct sadb_supported);
1522 }
1523
1524 enc_len = xfrm_count_enc_supported();
1525 if (enc_len) {
1526 enc_len *= sizeof(struct sadb_alg);
1527 enc_len += sizeof(struct sadb_supported);
1528 }
1529
1530 len = enc_len + auth_len + sizeof(struct sadb_msg);
1531
1532 skb = alloc_skb(len + 16, allocation);
1533 if (!skb)
1534 goto out_put_algs;
1535
1536 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1537 pfkey_hdr_dup(hdr, orig);
1538 hdr->sadb_msg_errno = 0;
1539 hdr->sadb_msg_len = len / sizeof(uint64_t);
1540
1541 if (auth_len) {
1542 struct sadb_supported *sp;
1543 struct sadb_alg *ap;
1544
1545 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1546 ap = (struct sadb_alg *) (sp + 1);
1547
1548 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1549 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1550
1551 for (i = 0; ; i++) {
1552 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1553 if (!aalg)
1554 break;
1555 if (aalg->available)
1556 *ap++ = aalg->desc;
1557 }
1558 }
1559
1560 if (enc_len) {
1561 struct sadb_supported *sp;
1562 struct sadb_alg *ap;
1563
1564 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1565 ap = (struct sadb_alg *) (sp + 1);
1566
1567 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1568 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1569
1570 for (i = 0; ; i++) {
1571 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1572 if (!ealg)
1573 break;
1574 if (ealg->available)
1575 *ap++ = ealg->desc;
1576 }
1577 }
1578
1579out_put_algs:
1580 return skb;
1581}
1582
1583static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1584{
1585 struct pfkey_sock *pfk = pfkey_sk(sk);
1586 struct sk_buff *supp_skb;
1587
1588 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1589 return -EINVAL;
1590
1591 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1592 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1593 return -EEXIST;
1594 pfk->registered |= (1<<hdr->sadb_msg_satype);
1595 }
1596
1597 xfrm_probe_algs();
1598
1599 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1600 if (!supp_skb) {
1601 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1602 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1603
1604 return -ENOBUFS;
1605 }
1606
1607 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1608
1609 return 0;
1610}
1611
26b15dad
JHS		 1612static int key_notify_sa_flush(struct km_event *c)
1613{
1614 struct sk_buff *skb;
1615 struct sadb_msg *hdr;
1616
1617 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1618 if (!skb)
1619 return -ENOBUFS;
1620 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
bf08867f 1621 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
26b15dad
JHS		 1622 hdr->sadb_msg_seq = c->seq;
1623 hdr->sadb_msg_pid = c->pid;
1624 hdr->sadb_msg_version = PF_KEY_V2;
1625 hdr->sadb_msg_errno = (uint8_t) 0;
1626 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1627
1628 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1629
1630 return 0;
1631}
1632
1da177e4
LT		 1633static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1634{
1635 unsigned proto;
26b15dad 1636 struct km_event c;
1da177e4
LT		 1637
1638 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1639 if (proto == 0)
1640 return -EINVAL;
1641
1da177e4 1642 xfrm_state_flush(proto);
bf08867f 1643 c.data.proto = proto;
26b15dad
JHS		 1644 c.seq = hdr->sadb_msg_seq;
1645 c.pid = hdr->sadb_msg_pid;
f60f6b8f 1646 c.event = XFRM_MSG_FLUSHSA;
26b15dad 1647 km_state_notify(NULL, &c);
1da177e4
LT		 1648
1649 return 0;
1650}
1651
1652struct pfkey_dump_data
1653{
1654 struct sk_buff *skb;
1655 struct sadb_msg *hdr;
1656 struct sock *sk;
1657};
1658
1659static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1660{
1661 struct pfkey_dump_data *data = ptr;
1662 struct sk_buff *out_skb;
1663 struct sadb_msg *out_hdr;
1664
1665 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1666 if (IS_ERR(out_skb))
1667 return PTR_ERR(out_skb);
1668
1669 out_hdr = (struct sadb_msg *) out_skb->data;
1670 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1671 out_hdr->sadb_msg_type = SADB_DUMP;
1672 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1673 out_hdr->sadb_msg_errno = 0;
1674 out_hdr->sadb_msg_reserved = 0;
1675 out_hdr->sadb_msg_seq = count;
1676 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1677 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1678 return 0;
1679}
1680
1681static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1682{
1683 u8 proto;
1684 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1685
1686 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1687 if (proto == 0)
1688 return -EINVAL;
1689
1690 return xfrm_state_walk(proto, dump_sa, &data);
1691}
1692
1693static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1694{
1695 struct pfkey_sock *pfk = pfkey_sk(sk);
1696 int satype = hdr->sadb_msg_satype;
1697
1698 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1699 /* XXX we mangle packet... */
1700 hdr->sadb_msg_errno = 0;
1701 if (satype != 0 && satype != 1)
1702 return -EINVAL;
1703 pfk->promisc = satype;
1704 }
1705 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1706 return 0;
1707}
1708
1709static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1710{
1711 int i;
1712 u32 reqid = *(u32*)ptr;
1713
1714 for (i=0; i<xp->xfrm_nr; i++) {
1715 if (xp->xfrm_vec[i].reqid == reqid)
1716 return -EEXIST;
1717 }
1718 return 0;
1719}
1720
1721static u32 gen_reqid(void)
1722{
1723 u32 start;
1724 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1725
1726 start = reqid;
1727 do {
1728 ++reqid;
1729 if (reqid == 0)
1730 reqid = IPSEC_MANUAL_REQID_MAX+1;
1731 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1732 return reqid;
1733 } while (reqid != start);
1734 return 0;
1735}
1736
1737static int
1738parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1739{
1740 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1741 struct sockaddr_in *sin;
1742#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1743 struct sockaddr_in6 *sin6;
1744#endif
1745
1746 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1747 return -ELOOP;
1748
1749 if (rq->sadb_x_ipsecrequest_mode == 0)
1750 return -EINVAL;
1751
1752 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1753 t->mode = rq->sadb_x_ipsecrequest_mode-1;
1754 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1755 t->optional = 1;
1756 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1757 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1758 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1759 t->reqid = 0;
1760 if (!t->reqid && !(t->reqid = gen_reqid()))
1761 return -ENOBUFS;
1762 }
1763
1764 /* addresses present only in tunnel mode */
1765 if (t->mode) {
1766 switch (xp->family) {
1767 case AF_INET:
1768 sin = (void*)(rq+1);
1769 if (sin->sin_family != AF_INET)
1770 return -EINVAL;
1771 t->saddr.a4 = sin->sin_addr.s_addr;
1772 sin++;
1773 if (sin->sin_family != AF_INET)
1774 return -EINVAL;
1775 t->id.daddr.a4 = sin->sin_addr.s_addr;
1776 break;
1777#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1778 case AF_INET6:
1779 sin6 = (void *)(rq+1);
1780 if (sin6->sin6_family != AF_INET6)
1781 return -EINVAL;
1782 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1783 sin6++;
1784 if (sin6->sin6_family != AF_INET6)
1785 return -EINVAL;
1786 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1787 break;
1788#endif
1789 default:
1790 return -EINVAL;
1791 }
1792 }
1793 /* No way to set this via kame pfkey */
1794 t->aalgos = t->ealgos = t->calgos = ~0;
1795 xp->xfrm_nr++;
1796 return 0;
1797}
1798
1799static int
1800parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1801{
1802 int err;
1803 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1804 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1805
1806 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1807 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1808 return err;
1809 len -= rq->sadb_x_ipsecrequest_len;
1810 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1811 }
1812 return 0;
1813}
1814
df71837d
TJ		 1815static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1816{
1817 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1818
1819 if (xfrm_ctx) {
1820 int len = sizeof(struct sadb_x_sec_ctx);
1821 len += xfrm_ctx->ctx_len;
1822 return PFKEY_ALIGN8(len);
1823 }
1824 return 0;
1825}
1826
1da177e4
LT		 1827static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1828{
1829 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1830 int socklen = (xp->family == AF_INET ?
1831 sizeof(struct sockaddr_in) :
1832 sizeof(struct sockaddr_in6));
1833
1834 return sizeof(struct sadb_msg) +
1835 (sizeof(struct sadb_lifetime) * 3) +
1836 (sizeof(struct sadb_address) * 2) +
1837 (sockaddr_size * 2) +
1838 sizeof(struct sadb_x_policy) +
1839 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
df71837d
TJ		 1840 (socklen * 2))) +
1841 pfkey_xfrm_policy2sec_ctx_size(xp);
1da177e4
LT		 1842}
1843
1844static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1845{
1846 struct sk_buff *skb;
1847 int size;
1848
1849 size = pfkey_xfrm_policy2msg_size(xp);
1850
1851 skb = alloc_skb(size + 16, GFP_ATOMIC);
1852 if (skb == NULL)
1853 return ERR_PTR(-ENOBUFS);
1854
1855 return skb;
1856}
1857
1858static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1859{
1860 struct sadb_msg *hdr;
1861 struct sadb_address *addr;
1862 struct sadb_lifetime *lifetime;
1863 struct sadb_x_policy *pol;
1864 struct sockaddr_in *sin;
df71837d
TJ		 1865 struct sadb_x_sec_ctx *sec_ctx;
1866 struct xfrm_sec_ctx *xfrm_ctx;
1da177e4
LT		 1867#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1868 struct sockaddr_in6 *sin6;
1869#endif
1870 int i;
1871 int size;
1872 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1873 int socklen = (xp->family == AF_INET ?
1874 sizeof(struct sockaddr_in) :
1875 sizeof(struct sockaddr_in6));
1876
1877 size = pfkey_xfrm_policy2msg_size(xp);
1878
1879 /* call should fill header later */
1880 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1881 memset(hdr, 0, size); /* XXX do we need this ? */
1882
1883 /* src address */
1884 addr = (struct sadb_address*) skb_put(skb,
1885 sizeof(struct sadb_address)+sockaddr_size);
1886 addr->sadb_address_len =
1887 (sizeof(struct sadb_address)+sockaddr_size)/
1888 sizeof(uint64_t);
1889 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1890 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1891 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1892 addr->sadb_address_reserved = 0;
1893 /* src address */
1894 if (xp->family == AF_INET) {
1895 sin = (struct sockaddr_in *) (addr + 1);
1896 sin->sin_family = AF_INET;
1897 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1898 sin->sin_port = xp->selector.sport;
1899 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1900 }
1901#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1902 else if (xp->family == AF_INET6) {
1903 sin6 = (struct sockaddr_in6 *) (addr + 1);
1904 sin6->sin6_family = AF_INET6;
1905 sin6->sin6_port = xp->selector.sport;
1906 sin6->sin6_flowinfo = 0;
1907 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1908 sizeof(struct in6_addr));
1909 sin6->sin6_scope_id = 0;
1910 }
1911#endif
1912 else
1913 BUG();
1914
1915 /* dst address */
1916 addr = (struct sadb_address*) skb_put(skb,
1917 sizeof(struct sadb_address)+sockaddr_size);
1918 addr->sadb_address_len =
1919 (sizeof(struct sadb_address)+sockaddr_size)/
1920 sizeof(uint64_t);
1921 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1922 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1923 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1924 addr->sadb_address_reserved = 0;
1925 if (xp->family == AF_INET) {
1926 sin = (struct sockaddr_in *) (addr + 1);
1927 sin->sin_family = AF_INET;
1928 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1929 sin->sin_port = xp->selector.dport;
1930 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1931 }
1932#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1933 else if (xp->family == AF_INET6) {
1934 sin6 = (struct sockaddr_in6 *) (addr + 1);
1935 sin6->sin6_family = AF_INET6;
1936 sin6->sin6_port = xp->selector.dport;
1937 sin6->sin6_flowinfo = 0;
1938 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1939 sizeof(struct in6_addr));
1940 sin6->sin6_scope_id = 0;
1941 }
1942#endif
1943 else
1944 BUG();
1945
1946 /* hard time */
1947 lifetime = (struct sadb_lifetime *) skb_put(skb,
1948 sizeof(struct sadb_lifetime));
1949 lifetime->sadb_lifetime_len =
1950 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1951 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1952 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
1953 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1954 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1955 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1956 /* soft time */
1957 lifetime = (struct sadb_lifetime *) skb_put(skb,
1958 sizeof(struct sadb_lifetime));
1959 lifetime->sadb_lifetime_len =
1960 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1961 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1962 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
1963 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1964 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1965 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1966 /* current time */
1967 lifetime = (struct sadb_lifetime *) skb_put(skb,
1968 sizeof(struct sadb_lifetime));
1969 lifetime->sadb_lifetime_len =
1970 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1971 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1972 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1973 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1974 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1975 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1976
1977 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
1978 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1979 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1980 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1981 if (xp->action == XFRM_POLICY_ALLOW) {
1982 if (xp->xfrm_nr)
1983 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1984 else
1985 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1986 }
1987 pol->sadb_x_policy_dir = dir+1;
1988 pol->sadb_x_policy_id = xp->index;
1989 pol->sadb_x_policy_priority = xp->priority;
1990
1991 for (i=0; i<xp->xfrm_nr; i++) {
1992 struct sadb_x_ipsecrequest *rq;
1993 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1994 int req_size;
1995
1996 req_size = sizeof(struct sadb_x_ipsecrequest);
1997 if (t->mode)
1998 req_size += 2*socklen;
1999 else
2000 size -= 2*socklen;
2001 rq = (void*)skb_put(skb, req_size);
2002 pol->sadb_x_policy_len += req_size/8;
2003 memset(rq, 0, sizeof(*rq));
2004 rq->sadb_x_ipsecrequest_len = req_size;
2005 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2006 rq->sadb_x_ipsecrequest_mode = t->mode+1;
2007 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2008 if (t->reqid)
2009 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2010 if (t->optional)
2011 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2012 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2013 if (t->mode) {
2014 switch (xp->family) {
2015 case AF_INET:
2016 sin = (void*)(rq+1);
2017 sin->sin_family = AF_INET;
2018 sin->sin_addr.s_addr = t->saddr.a4;
2019 sin->sin_port = 0;
2020 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2021 sin++;
2022 sin->sin_family = AF_INET;
2023 sin->sin_addr.s_addr = t->id.daddr.a4;
2024 sin->sin_port = 0;
2025 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2026 break;
2027#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2028 case AF_INET6:
2029 sin6 = (void*)(rq+1);
2030 sin6->sin6_family = AF_INET6;
2031 sin6->sin6_port = 0;
2032 sin6->sin6_flowinfo = 0;
2033 memcpy(&sin6->sin6_addr, t->saddr.a6,
2034 sizeof(struct in6_addr));
2035 sin6->sin6_scope_id = 0;
2036
2037 sin6++;
2038 sin6->sin6_family = AF_INET6;
2039 sin6->sin6_port = 0;
2040 sin6->sin6_flowinfo = 0;
2041 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
2042 sizeof(struct in6_addr));
2043 sin6->sin6_scope_id = 0;
2044 break;
2045#endif
2046 default:
2047 break;
2048 }
2049 }
2050 }
df71837d
TJ		 2051
2052 /* security context */
2053 if ((xfrm_ctx = xp->security)) {
2054 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2055
2056 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2057 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2058 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2059 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2060 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2061 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2062 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2063 xfrm_ctx->ctx_len);
2064 }
2065
1da177e4
LT		 2066 hdr->sadb_msg_len = size / sizeof(uint64_t);
2067 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2068}
2069
26b15dad
JHS		 2070static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2071{
2072 struct sk_buff *out_skb;
2073 struct sadb_msg *out_hdr;
2074 int err;
2075
2076 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2077 if (IS_ERR(out_skb)) {
2078 err = PTR_ERR(out_skb);
2079 goto out;
2080 }
2081 pfkey_xfrm_policy2msg(out_skb, xp, dir);
2082
2083 out_hdr = (struct sadb_msg *) out_skb->data;
2084 out_hdr->sadb_msg_version = PF_KEY_V2;
2085
f60f6b8f 2086 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
26b15dad
JHS		 2087 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2088 else
2089 out_hdr->sadb_msg_type = event2poltype(c->event);
2090 out_hdr->sadb_msg_errno = 0;
2091 out_hdr->sadb_msg_seq = c->seq;
2092 out_hdr->sadb_msg_pid = c->pid;
2093 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2094out:
2095 return 0;
2096
2097}
2098
1da177e4
LT		 2099static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2100{
df71837d 2101 int err = 0;
1da177e4
LT		 2102 struct sadb_lifetime *lifetime;
2103 struct sadb_address *sa;
2104 struct sadb_x_policy *pol;
2105 struct xfrm_policy *xp;
26b15dad 2106 struct km_event c;
df71837d 2107 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 2108
2109 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2110 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2111 !ext_hdrs[SADB_X_EXT_POLICY-1])
2112 return -EINVAL;
2113
2114 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2115 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2116 return -EINVAL;
2117 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2118 return -EINVAL;
2119
2120 xp = xfrm_policy_alloc(GFP_KERNEL);
2121 if (xp == NULL)
2122 return -ENOBUFS;
2123
2124 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2125 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2126 xp->priority = pol->sadb_x_policy_priority;
2127
2128 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2129 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2130 if (!xp->family) {
2131 err = -EINVAL;
2132 goto out;
2133 }
2134 xp->selector.family = xp->family;
2135 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2136 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2137 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2138 if (xp->selector.sport)
2139 xp->selector.sport_mask = ~0;
2140
2141 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2142 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2143 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2144
2145 /* Amusing, we set this twice. KAME apps appear to set same value
2146 * in both addresses.
2147 */
2148 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2149
2150 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2151 if (xp->selector.dport)
2152 xp->selector.dport_mask = ~0;
2153
df71837d
TJ		 2154 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2155 if (sec_ctx != NULL) {
2156 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2157
2158 if (!uctx) {
2159 err = -ENOBUFS;
2160 goto out;
2161 }
2162
2163 err = security_xfrm_policy_alloc(xp, uctx);
2164 kfree(uctx);
2165
2166 if (err)
2167 goto out;
2168 }
2169
1da177e4
LT		 2170 xp->lft.soft_byte_limit = XFRM_INF;
2171 xp->lft.hard_byte_limit = XFRM_INF;
2172 xp->lft.soft_packet_limit = XFRM_INF;
2173 xp->lft.hard_packet_limit = XFRM_INF;
2174 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2175 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2176 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2177 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2178 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2179 }
2180 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2181 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2182 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2183 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2184 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2185 }
2186 xp->xfrm_nr = 0;
2187 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2188 (err = parse_ipsecrequests(xp, pol)) < 0)
2189 goto out;
2190
1da177e4
LT		 2191 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2192 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
df71837d
TJ		 2193
2194 if (err)
2195 goto out;
1da177e4 2196
26b15dad 2197 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
f60f6b8f
HX		 2198 c.event = XFRM_MSG_UPDPOLICY;
2199 else
2200 c.event = XFRM_MSG_NEWPOLICY;
1da177e4 2201
26b15dad
JHS		 2202 c.seq = hdr->sadb_msg_seq;
2203 c.pid = hdr->sadb_msg_pid;
1da177e4 2204
26b15dad
JHS		 2205 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2206 xfrm_pol_put(xp);
1da177e4
LT		 2207 return 0;
2208
2209out:
df71837d 2210 security_xfrm_policy_free(xp);
1da177e4
LT		 2211 kfree(xp);
2212 return err;
2213}
2214
2215static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2216{
2217 int err;
2218 struct sadb_address *sa;
2219 struct sadb_x_policy *pol;
df71837d 2220 struct xfrm_policy *xp, tmp;
1da177e4 2221 struct xfrm_selector sel;
26b15dad 2222 struct km_event c;
df71837d 2223 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 2224
2225 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2226 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2227 !ext_hdrs[SADB_X_EXT_POLICY-1])
2228 return -EINVAL;
2229
2230 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2231 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2232 return -EINVAL;
2233
2234 memset(&sel, 0, sizeof(sel));
2235
2236 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2237 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2238 sel.prefixlen_s = sa->sadb_address_prefixlen;
2239 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2240 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2241 if (sel.sport)
2242 sel.sport_mask = ~0;
2243
2244 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2245 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2246 sel.prefixlen_d = sa->sadb_address_prefixlen;
2247 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2248 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2249 if (sel.dport)
2250 sel.dport_mask = ~0;
2251
df71837d
TJ		 2252 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2253 memset(&tmp, 0, sizeof(struct xfrm_policy));
2254
2255 if (sec_ctx != NULL) {
2256 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2257
2258 if (!uctx)
2259 return -ENOMEM;
2260
2261 err = security_xfrm_policy_alloc(&tmp, uctx);
2262 kfree(uctx);
2263
2264 if (err)
2265 return err;
2266 }
2267
2268 xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1);
2269 security_xfrm_policy_free(&tmp);
1da177e4
LT		 2270 if (xp == NULL)
2271 return -ENOENT;
2272
2273 err = 0;
2274
26b15dad
JHS		 2275 c.seq = hdr->sadb_msg_seq;
2276 c.pid = hdr->sadb_msg_pid;
f60f6b8f 2277 c.event = XFRM_MSG_DELPOLICY;
26b15dad
JHS		 2278 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2279
2280 xfrm_pol_put(xp);
2281 return err;
2282}
2283
2284static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2285{
2286 int err;
2287 struct sk_buff *out_skb;
2288 struct sadb_msg *out_hdr;
2289 err = 0;
2290
1da177e4
LT		 2291 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2292 if (IS_ERR(out_skb)) {
2293 err = PTR_ERR(out_skb);
2294 goto out;
2295 }
26b15dad 2296 pfkey_xfrm_policy2msg(out_skb, xp, dir);
1da177e4
LT		 2297
2298 out_hdr = (struct sadb_msg *) out_skb->data;
2299 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
26b15dad 2300 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1da177e4
LT		 2301 out_hdr->sadb_msg_satype = 0;
2302 out_hdr->sadb_msg_errno = 0;
2303 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2304 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
26b15dad 2305 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1da177e4
LT		 2306 err = 0;
2307
2308out:
1da177e4
LT		 2309 return err;
2310}
2311
2312static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2313{
77d8d7a6 2314 unsigned int dir;
1da177e4
LT		 2315 int err;
2316 struct sadb_x_policy *pol;
2317 struct xfrm_policy *xp;
26b15dad 2318 struct km_event c;
1da177e4
LT		 2319
2320 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2321 return -EINVAL;
2322
77d8d7a6
HX		 2323 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2324 if (dir >= XFRM_POLICY_MAX)
2325 return -EINVAL;
2326
2327 xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id,
1da177e4
LT		 2328 hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2329 if (xp == NULL)
2330 return -ENOENT;
2331
2332 err = 0;
2333
26b15dad
JHS		 2334 c.seq = hdr->sadb_msg_seq;
2335 c.pid = hdr->sadb_msg_pid;
2336 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
bf08867f 2337 c.data.byid = 1;
f60f6b8f 2338 c.event = XFRM_MSG_DELPOLICY;
77d8d7a6 2339 km_policy_notify(xp, dir, &c);
26b15dad 2340 } else {
77d8d7a6 2341 err = key_pol_get_resp(sk, xp, hdr, dir);
1da177e4 2342 }
1da177e4 2343
1da177e4
LT		 2344 xfrm_pol_put(xp);
2345 return err;
2346}
2347
2348static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2349{
2350 struct pfkey_dump_data *data = ptr;
2351 struct sk_buff *out_skb;
2352 struct sadb_msg *out_hdr;
2353
2354 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2355 if (IS_ERR(out_skb))
2356 return PTR_ERR(out_skb);
2357
2358 pfkey_xfrm_policy2msg(out_skb, xp, dir);
2359
2360 out_hdr = (struct sadb_msg *) out_skb->data;
2361 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2362 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2363 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2364 out_hdr->sadb_msg_errno = 0;
2365 out_hdr->sadb_msg_seq = count;
2366 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2367 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2368 return 0;
2369}
2370
2371static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2372{
2373 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2374
2375 return xfrm_policy_walk(dump_sp, &data);
2376}
2377
26b15dad 2378static int key_notify_policy_flush(struct km_event *c)
1da177e4
LT		 2379{
2380 struct sk_buff *skb_out;
26b15dad 2381 struct sadb_msg *hdr;
1da177e4 2382
26b15dad 2383 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1da177e4
LT		 2384 if (!skb_out)
2385 return -ENOBUFS;
26b15dad
JHS		 2386 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2387 hdr->sadb_msg_seq = c->seq;
2388 hdr->sadb_msg_pid = c->pid;
2389 hdr->sadb_msg_version = PF_KEY_V2;
2390 hdr->sadb_msg_errno = (uint8_t) 0;
2391 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2392 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2393 return 0;
1da177e4 2394
26b15dad
JHS		 2395}
2396
2397static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2398{
2399 struct km_event c;
1da177e4 2400
26b15dad 2401 xfrm_policy_flush();
f60f6b8f 2402 c.event = XFRM_MSG_FLUSHPOLICY;
26b15dad
JHS		 2403 c.pid = hdr->sadb_msg_pid;
2404 c.seq = hdr->sadb_msg_seq;
2405 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 2406
2407 return 0;
2408}
2409
2410typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2411 struct sadb_msg *hdr, void **ext_hdrs);
2412static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2413 [SADB_RESERVED] = pfkey_reserved,
2414 [SADB_GETSPI] = pfkey_getspi,
2415 [SADB_UPDATE] = pfkey_add,
2416 [SADB_ADD] = pfkey_add,
2417 [SADB_DELETE] = pfkey_delete,
2418 [SADB_GET] = pfkey_get,
2419 [SADB_ACQUIRE] = pfkey_acquire,
2420 [SADB_REGISTER] = pfkey_register,
2421 [SADB_EXPIRE] = NULL,
2422 [SADB_FLUSH] = pfkey_flush,
2423 [SADB_DUMP] = pfkey_dump,
2424 [SADB_X_PROMISC] = pfkey_promisc,
2425 [SADB_X_PCHANGE] = NULL,
2426 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2427 [SADB_X_SPDADD] = pfkey_spdadd,
2428 [SADB_X_SPDDELETE] = pfkey_spddelete,
2429 [SADB_X_SPDGET] = pfkey_spdget,
2430 [SADB_X_SPDACQUIRE] = NULL,
2431 [SADB_X_SPDDUMP] = pfkey_spddump,
2432 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2433 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2434 [SADB_X_SPDDELETE2] = pfkey_spdget,
2435};
2436
2437static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2438{
2439 void *ext_hdrs[SADB_EXT_MAX];
2440 int err;
2441
2442 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2443 BROADCAST_PROMISC_ONLY, NULL);
2444
2445 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2446 err = parse_exthdrs(skb, hdr, ext_hdrs);
2447 if (!err) {
2448 err = -EOPNOTSUPP;
2449 if (pfkey_funcs[hdr->sadb_msg_type])
2450 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2451 }
2452 return err;
2453}
2454
2455static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2456{
2457 struct sadb_msg *hdr = NULL;
2458
2459 if (skb->len < sizeof(*hdr)) {
2460 *errp = -EMSGSIZE;
2461 } else {
2462 hdr = (struct sadb_msg *) skb->data;
2463 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2464 hdr->sadb_msg_reserved != 0 ||
2465 (hdr->sadb_msg_type <= SADB_RESERVED ||
2466 hdr->sadb_msg_type > SADB_MAX)) {
2467 hdr = NULL;
2468 *errp = -EINVAL;
2469 } else if (hdr->sadb_msg_len != (skb->len /
2470 sizeof(uint64_t)) ||
2471 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2472 sizeof(uint64_t))) {
2473 hdr = NULL;
2474 *errp = -EMSGSIZE;
2475 } else {
2476 *errp = 0;
2477 }
2478 }
2479 return hdr;
2480}
2481
2482static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2483{
2484 return t->aalgos & (1 << d->desc.sadb_alg_id);
2485}
2486
2487static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2488{
2489 return t->ealgos & (1 << d->desc.sadb_alg_id);
2490}
2491
2492static int count_ah_combs(struct xfrm_tmpl *t)
2493{
2494 int i, sz = 0;
2495
2496 for (i = 0; ; i++) {
2497 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2498 if (!aalg)
2499 break;
2500 if (aalg_tmpl_set(t, aalg) && aalg->available)
2501 sz += sizeof(struct sadb_comb);
2502 }
2503 return sz + sizeof(struct sadb_prop);
2504}
2505
2506static int count_esp_combs(struct xfrm_tmpl *t)
2507{
2508 int i, k, sz = 0;
2509
2510 for (i = 0; ; i++) {
2511 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2512 if (!ealg)
2513 break;
2514
2515 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2516 continue;
2517
2518 for (k = 1; ; k++) {
2519 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2520 if (!aalg)
2521 break;
2522
2523 if (aalg_tmpl_set(t, aalg) && aalg->available)
2524 sz += sizeof(struct sadb_comb);
2525 }
2526 }
2527 return sz + sizeof(struct sadb_prop);
2528}
2529
2530static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2531{
2532 struct sadb_prop *p;
2533 int i;
2534
2535 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2536 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2537 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2538 p->sadb_prop_replay = 32;
2539 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2540
2541 for (i = 0; ; i++) {
2542 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2543 if (!aalg)
2544 break;
2545
2546 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2547 struct sadb_comb *c;
2548 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2549 memset(c, 0, sizeof(*c));
2550 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2551 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2552 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2553 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2554 c->sadb_comb_hard_addtime = 24*60*60;
2555 c->sadb_comb_soft_addtime = 20*60*60;
2556 c->sadb_comb_hard_usetime = 8*60*60;
2557 c->sadb_comb_soft_usetime = 7*60*60;
2558 }
2559 }
2560}
2561
2562static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2563{
2564 struct sadb_prop *p;
2565 int i, k;
2566
2567 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2568 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2569 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2570 p->sadb_prop_replay = 32;
2571 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2572
2573 for (i=0; ; i++) {
2574 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2575 if (!ealg)
2576 break;
2577
2578 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2579 continue;
2580
2581 for (k = 1; ; k++) {
2582 struct sadb_comb *c;
2583 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2584 if (!aalg)
2585 break;
2586 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2587 continue;
2588 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2589 memset(c, 0, sizeof(*c));
2590 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2591 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2592 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2593 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2594 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2595 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2596 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2597 c->sadb_comb_hard_addtime = 24*60*60;
2598 c->sadb_comb_soft_addtime = 20*60*60;
2599 c->sadb_comb_hard_usetime = 8*60*60;
2600 c->sadb_comb_soft_usetime = 7*60*60;
2601 }
2602 }
2603}
2604
26b15dad
JHS		 2605static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2606{
2607 return 0;
2608}
2609
2610static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 2611{
2612 struct sk_buff *out_skb;
2613 struct sadb_msg *out_hdr;
26b15dad
JHS		 2614 int hard;
2615 int hsc;
2616
bf08867f 2617 hard = c->data.hard;
26b15dad
JHS		 2618 if (hard)
2619 hsc = 2;
2620 else
2621 hsc = 1;
1da177e4
LT		 2622
2623 out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2624 if (IS_ERR(out_skb))
2625 return PTR_ERR(out_skb);
2626
2627 out_hdr = (struct sadb_msg *) out_skb->data;
2628 out_hdr->sadb_msg_version = PF_KEY_V2;
2629 out_hdr->sadb_msg_type = SADB_EXPIRE;
2630 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2631 out_hdr->sadb_msg_errno = 0;
2632 out_hdr->sadb_msg_reserved = 0;
2633 out_hdr->sadb_msg_seq = 0;
2634 out_hdr->sadb_msg_pid = 0;
2635
2636 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2637 return 0;
2638}
2639
26b15dad
JHS		 2640static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2641{
2642 switch (c->event) {
f60f6b8f 2643 case XFRM_MSG_EXPIRE:
26b15dad 2644 return key_notify_sa_expire(x, c);
f60f6b8f
HX		 2645 case XFRM_MSG_DELSA:
2646 case XFRM_MSG_NEWSA:
2647 case XFRM_MSG_UPDSA:
26b15dad 2648 return key_notify_sa(x, c);
f60f6b8f 2649 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2650 return key_notify_sa_flush(c);
2651 default:
2652 printk("pfkey: Unknown SA event %d\n", c->event);
2653 break;
2654 }
2655
2656 return 0;
2657}
2658
2659static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2660{
2661 switch (c->event) {
f60f6b8f 2662 case XFRM_MSG_POLEXPIRE:
26b15dad 2663 return key_notify_policy_expire(xp, c);
f60f6b8f
HX		 2664 case XFRM_MSG_DELPOLICY:
2665 case XFRM_MSG_NEWPOLICY:
2666 case XFRM_MSG_UPDPOLICY:
26b15dad 2667 return key_notify_policy(xp, dir, c);
f60f6b8f 2668 case XFRM_MSG_FLUSHPOLICY:
26b15dad
JHS		 2669 return key_notify_policy_flush(c);
2670 default:
2671 printk("pfkey: Unknown policy event %d\n", c->event);
2672 break;
2673 }
2674
2675 return 0;
2676}
2677
1da177e4
LT		 2678static u32 get_acqseq(void)
2679{
2680 u32 res;
2681 static u32 acqseq;
2682 static DEFINE_SPINLOCK(acqseq_lock);
2683
2684 spin_lock_bh(&acqseq_lock);
2685 res = (++acqseq ? : ++acqseq);
2686 spin_unlock_bh(&acqseq_lock);
2687 return res;
2688}
2689
2690static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2691{
2692 struct sk_buff *skb;
2693 struct sadb_msg *hdr;
2694 struct sadb_address *addr;
2695 struct sadb_x_policy *pol;
2696 struct sockaddr_in *sin;
2697#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2698 struct sockaddr_in6 *sin6;
2699#endif
2700 int sockaddr_size;
2701 int size;
2702
2703 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2704 if (!sockaddr_size)
2705 return -EINVAL;
2706
2707 size = sizeof(struct sadb_msg) +
2708 (sizeof(struct sadb_address) * 2) +
2709 (sockaddr_size * 2) +
2710 sizeof(struct sadb_x_policy);
2711
2712 if (x->id.proto == IPPROTO_AH)
2713 size += count_ah_combs(t);
2714 else if (x->id.proto == IPPROTO_ESP)
2715 size += count_esp_combs(t);
2716
2717 skb = alloc_skb(size + 16, GFP_ATOMIC);
2718 if (skb == NULL)
2719 return -ENOMEM;
2720
2721 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2722 hdr->sadb_msg_version = PF_KEY_V2;
2723 hdr->sadb_msg_type = SADB_ACQUIRE;
2724 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2725 hdr->sadb_msg_len = size / sizeof(uint64_t);
2726 hdr->sadb_msg_errno = 0;
2727 hdr->sadb_msg_reserved = 0;
2728 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2729 hdr->sadb_msg_pid = 0;
2730
2731 /* src address */
2732 addr = (struct sadb_address*) skb_put(skb,
2733 sizeof(struct sadb_address)+sockaddr_size);
2734 addr->sadb_address_len =
2735 (sizeof(struct sadb_address)+sockaddr_size)/
2736 sizeof(uint64_t);
2737 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2738 addr->sadb_address_proto = 0;
2739 addr->sadb_address_reserved = 0;
2740 if (x->props.family == AF_INET) {
2741 addr->sadb_address_prefixlen = 32;
2742
2743 sin = (struct sockaddr_in *) (addr + 1);
2744 sin->sin_family = AF_INET;
2745 sin->sin_addr.s_addr = x->props.saddr.a4;
2746 sin->sin_port = 0;
2747 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2748 }
2749#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2750 else if (x->props.family == AF_INET6) {
2751 addr->sadb_address_prefixlen = 128;
2752
2753 sin6 = (struct sockaddr_in6 *) (addr + 1);
2754 sin6->sin6_family = AF_INET6;
2755 sin6->sin6_port = 0;
2756 sin6->sin6_flowinfo = 0;
2757 memcpy(&sin6->sin6_addr,
2758 x->props.saddr.a6, sizeof(struct in6_addr));
2759 sin6->sin6_scope_id = 0;
2760 }
2761#endif
2762 else
2763 BUG();
2764
2765 /* dst address */
2766 addr = (struct sadb_address*) skb_put(skb,
2767 sizeof(struct sadb_address)+sockaddr_size);
2768 addr->sadb_address_len =
2769 (sizeof(struct sadb_address)+sockaddr_size)/
2770 sizeof(uint64_t);
2771 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2772 addr->sadb_address_proto = 0;
2773 addr->sadb_address_reserved = 0;
2774 if (x->props.family == AF_INET) {
2775 addr->sadb_address_prefixlen = 32;
2776
2777 sin = (struct sockaddr_in *) (addr + 1);
2778 sin->sin_family = AF_INET;
2779 sin->sin_addr.s_addr = x->id.daddr.a4;
2780 sin->sin_port = 0;
2781 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2782 }
2783#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2784 else if (x->props.family == AF_INET6) {
2785 addr->sadb_address_prefixlen = 128;
2786
2787 sin6 = (struct sockaddr_in6 *) (addr + 1);
2788 sin6->sin6_family = AF_INET6;
2789 sin6->sin6_port = 0;
2790 sin6->sin6_flowinfo = 0;
2791 memcpy(&sin6->sin6_addr,
2792 x->id.daddr.a6, sizeof(struct in6_addr));
2793 sin6->sin6_scope_id = 0;
2794 }
2795#endif
2796 else
2797 BUG();
2798
2799 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2800 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2801 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2802 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2803 pol->sadb_x_policy_dir = dir+1;
2804 pol->sadb_x_policy_id = xp->index;
2805
2806 /* Set sadb_comb's. */
2807 if (x->id.proto == IPPROTO_AH)
2808 dump_ah_combs(skb, t);
2809 else if (x->id.proto == IPPROTO_ESP)
2810 dump_esp_combs(skb, t);
2811
2812 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2813}
2814
2815static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2816 u8 *data, int len, int *dir)
2817{
2818 struct xfrm_policy *xp;
2819 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
df71837d 2820 struct sadb_x_sec_ctx *sec_ctx;
1da177e4
LT		 2821
2822 switch (family) {
2823 case AF_INET:
2824 if (opt != IP_IPSEC_POLICY) {
2825 *dir = -EOPNOTSUPP;
2826 return NULL;
2827 }
2828 break;
2829#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2830 case AF_INET6:
2831 if (opt != IPV6_IPSEC_POLICY) {
2832 *dir = -EOPNOTSUPP;
2833 return NULL;
2834 }
2835 break;
2836#endif
2837 default:
2838 *dir = -EINVAL;
2839 return NULL;
2840 }
2841
2842 *dir = -EINVAL;
2843
2844 if (len < sizeof(struct sadb_x_policy) ||
2845 pol->sadb_x_policy_len*8 > len ||
2846 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2847 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2848 return NULL;
2849
2850 xp = xfrm_policy_alloc(GFP_ATOMIC);
2851 if (xp == NULL) {
2852 *dir = -ENOBUFS;
2853 return NULL;
2854 }
2855
2856 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2857 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2858
2859 xp->lft.soft_byte_limit = XFRM_INF;
2860 xp->lft.hard_byte_limit = XFRM_INF;
2861 xp->lft.soft_packet_limit = XFRM_INF;
2862 xp->lft.hard_packet_limit = XFRM_INF;
2863 xp->family = family;
2864
2865 xp->xfrm_nr = 0;
2866 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2867 (*dir = parse_ipsecrequests(xp, pol)) < 0)
2868 goto out;
2869
df71837d
TJ		 2870 /* security context too */
2871 if (len >= (pol->sadb_x_policy_len*8 +
2872 sizeof(struct sadb_x_sec_ctx))) {
2873 char *p = (char *)pol;
2874 struct xfrm_user_sec_ctx *uctx;
2875
2876 p += pol->sadb_x_policy_len*8;
2877 sec_ctx = (struct sadb_x_sec_ctx *)p;
2878 if (len < pol->sadb_x_policy_len*8 +
2879 sec_ctx->sadb_x_sec_len)
2880 goto out;
2881 if ((*dir = verify_sec_ctx_len(p)))
2882 goto out;
2883 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2884 *dir = security_xfrm_policy_alloc(xp, uctx);
2885 kfree(uctx);
2886
2887 if (*dir)
2888 goto out;
2889 }
2890
1da177e4
LT		 2891 *dir = pol->sadb_x_policy_dir-1;
2892 return xp;
2893
2894out:
df71837d 2895 security_xfrm_policy_free(xp);
1da177e4
LT		 2896 kfree(xp);
2897 return NULL;
2898}
2899
2900static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2901{
2902 struct sk_buff *skb;
2903 struct sadb_msg *hdr;
2904 struct sadb_sa *sa;
2905 struct sadb_address *addr;
2906 struct sadb_x_nat_t_port *n_port;
2907 struct sockaddr_in *sin;
2908#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2909 struct sockaddr_in6 *sin6;
2910#endif
2911 int sockaddr_size;
2912 int size;
2913 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2914 struct xfrm_encap_tmpl *natt = NULL;
2915
2916 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2917 if (!sockaddr_size)
2918 return -EINVAL;
2919
2920 if (!satype)
2921 return -EINVAL;
2922
2923 if (!x->encap)
2924 return -EINVAL;
2925
2926 natt = x->encap;
2927
2928 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2929 *
2930 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2931 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2932 */
2933
2934 size = sizeof(struct sadb_msg) +
2935 sizeof(struct sadb_sa) +
2936 (sizeof(struct sadb_address) * 2) +
2937 (sockaddr_size * 2) +
2938 (sizeof(struct sadb_x_nat_t_port) * 2);
2939
2940 skb = alloc_skb(size + 16, GFP_ATOMIC);
2941 if (skb == NULL)
2942 return -ENOMEM;
2943
2944 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2945 hdr->sadb_msg_version = PF_KEY_V2;
2946 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2947 hdr->sadb_msg_satype = satype;
2948 hdr->sadb_msg_len = size / sizeof(uint64_t);
2949 hdr->sadb_msg_errno = 0;
2950 hdr->sadb_msg_reserved = 0;
2951 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2952 hdr->sadb_msg_pid = 0;
2953
2954 /* SA */
2955 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2956 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2957 sa->sadb_sa_exttype = SADB_EXT_SA;
2958 sa->sadb_sa_spi = x->id.spi;
2959 sa->sadb_sa_replay = 0;
2960 sa->sadb_sa_state = 0;
2961 sa->sadb_sa_auth = 0;
2962 sa->sadb_sa_encrypt = 0;
2963 sa->sadb_sa_flags = 0;
2964
2965 /* ADDRESS_SRC (old addr) */
2966 addr = (struct sadb_address*)
2967 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2968 addr->sadb_address_len =
2969 (sizeof(struct sadb_address)+sockaddr_size)/
2970 sizeof(uint64_t);
2971 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2972 addr->sadb_address_proto = 0;
2973 addr->sadb_address_reserved = 0;
2974 if (x->props.family == AF_INET) {
2975 addr->sadb_address_prefixlen = 32;
2976
2977 sin = (struct sockaddr_in *) (addr + 1);
2978 sin->sin_family = AF_INET;
2979 sin->sin_addr.s_addr = x->props.saddr.a4;
2980 sin->sin_port = 0;
2981 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2982 }
2983#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2984 else if (x->props.family == AF_INET6) {
2985 addr->sadb_address_prefixlen = 128;
2986
2987 sin6 = (struct sockaddr_in6 *) (addr + 1);
2988 sin6->sin6_family = AF_INET6;
2989 sin6->sin6_port = 0;
2990 sin6->sin6_flowinfo = 0;
2991 memcpy(&sin6->sin6_addr,
2992 x->props.saddr.a6, sizeof(struct in6_addr));
2993 sin6->sin6_scope_id = 0;
2994 }
2995#endif
2996 else
2997 BUG();
2998
2999 /* NAT_T_SPORT (old port) */
3000 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3001 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3002 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3003 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3004 n_port->sadb_x_nat_t_port_reserved = 0;
3005
3006 /* ADDRESS_DST (new addr) */
3007 addr = (struct sadb_address*)
3008 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3009 addr->sadb_address_len =
3010 (sizeof(struct sadb_address)+sockaddr_size)/
3011 sizeof(uint64_t);
3012 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3013 addr->sadb_address_proto = 0;
3014 addr->sadb_address_reserved = 0;
3015 if (x->props.family == AF_INET) {
3016 addr->sadb_address_prefixlen = 32;
3017
3018 sin = (struct sockaddr_in *) (addr + 1);
3019 sin->sin_family = AF_INET;
3020 sin->sin_addr.s_addr = ipaddr->a4;
3021 sin->sin_port = 0;
3022 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3023 }
3024#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3025 else if (x->props.family == AF_INET6) {
3026 addr->sadb_address_prefixlen = 128;
3027
3028 sin6 = (struct sockaddr_in6 *) (addr + 1);
3029 sin6->sin6_family = AF_INET6;
3030 sin6->sin6_port = 0;
3031 sin6->sin6_flowinfo = 0;
3032 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
3033 sin6->sin6_scope_id = 0;
3034 }
3035#endif
3036 else
3037 BUG();
3038
3039 /* NAT_T_DPORT (new port) */
3040 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3041 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3042 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3043 n_port->sadb_x_nat_t_port_port = sport;
3044 n_port->sadb_x_nat_t_port_reserved = 0;
3045
3046 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3047}
3048
3049static int pfkey_sendmsg(struct kiocb *kiocb,
3050 struct socket *sock, struct msghdr *msg, size_t len)
3051{
3052 struct sock *sk = sock->sk;
3053 struct sk_buff *skb = NULL;
3054 struct sadb_msg *hdr = NULL;
3055 int err;
3056
3057 err = -EOPNOTSUPP;
3058 if (msg->msg_flags & MSG_OOB)
3059 goto out;
3060
3061 err = -EMSGSIZE;
3062 if ((unsigned)len > sk->sk_sndbuf - 32)
3063 goto out;
3064
3065 err = -ENOBUFS;
3066 skb = alloc_skb(len, GFP_KERNEL);
3067 if (skb == NULL)
3068 goto out;
3069
3070 err = -EFAULT;
3071 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3072 goto out;
3073
3074 hdr = pfkey_get_base_msg(skb, &err);
3075 if (!hdr)
3076 goto out;
3077
3078 down(&xfrm_cfg_sem);
3079 err = pfkey_process(sk, skb, hdr);
3080 up(&xfrm_cfg_sem);
3081
3082out:
3083 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3084 err = 0;
3085 if (skb)
3086 kfree_skb(skb);
3087
3088 return err ? : len;
3089}
3090
3091static int pfkey_recvmsg(struct kiocb *kiocb,
3092 struct socket *sock, struct msghdr *msg, size_t len,
3093 int flags)
3094{
3095 struct sock *sk = sock->sk;
3096 struct sk_buff *skb;
3097 int copied, err;
3098
3099 err = -EINVAL;
3100 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3101 goto out;
3102
3103 msg->msg_namelen = 0;
3104 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3105 if (skb == NULL)
3106 goto out;
3107
3108 copied = skb->len;
3109 if (copied > len) {
3110 msg->msg_flags |= MSG_TRUNC;
3111 copied = len;
3112 }
3113
3114 skb->h.raw = skb->data;
3115 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3116 if (err)
3117 goto out_free;
3118
3119 sock_recv_timestamp(msg, sk, skb);
3120
3121 err = (flags & MSG_TRUNC) ? skb->len : copied;
3122
3123out_free:
3124 skb_free_datagram(sk, skb);
3125out:
3126 return err;
3127}
3128
90ddc4f0 3129static const struct proto_ops pfkey_ops = {
1da177e4
LT		 3130 .family = PF_KEY,
3131 .owner = THIS_MODULE,
3132 /* Operations that make no sense on pfkey sockets. */
3133 .bind = sock_no_bind,
3134 .connect = sock_no_connect,
3135 .socketpair = sock_no_socketpair,
3136 .accept = sock_no_accept,
3137 .getname = sock_no_getname,
3138 .ioctl = sock_no_ioctl,
3139 .listen = sock_no_listen,
3140 .shutdown = sock_no_shutdown,
3141 .setsockopt = sock_no_setsockopt,
3142 .getsockopt = sock_no_getsockopt,
3143 .mmap = sock_no_mmap,
3144 .sendpage = sock_no_sendpage,
3145
3146 /* Now the operations that really occur. */
3147 .release = pfkey_release,
3148 .poll = datagram_poll,
3149 .sendmsg = pfkey_sendmsg,
3150 .recvmsg = pfkey_recvmsg,
3151};
3152
3153static struct net_proto_family pfkey_family_ops = {
3154 .family = PF_KEY,
3155 .create = pfkey_create,
3156 .owner = THIS_MODULE,
3157};
3158
3159#ifdef CONFIG_PROC_FS
3160static int pfkey_read_proc(char *buffer, char **start, off_t offset,
3161 int length, int *eof, void *data)
3162{
3163 off_t pos = 0;
3164 off_t begin = 0;
3165 int len = 0;
3166 struct sock *s;
3167 struct hlist_node *node;
3168
3169 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n");
3170
3171 read_lock(&pfkey_table_lock);
3172
3173 sk_for_each(s, node, &pfkey_table) {
3174 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
3175 s,
3176 atomic_read(&s->sk_refcnt),
3177 atomic_read(&s->sk_rmem_alloc),
3178 atomic_read(&s->sk_wmem_alloc),
3179 sock_i_uid(s),
3180 sock_i_ino(s)
3181 );
3182
3183 buffer[len++] = '\n';
3184
3185 pos = begin + len;
3186 if (pos < offset) {
3187 len = 0;
3188 begin = pos;
3189 }
3190 if(pos > offset + length)
3191 goto done;
3192 }
3193 *eof = 1;
3194
3195done:
3196 read_unlock(&pfkey_table_lock);
3197
3198 *start = buffer + (offset - begin);
3199 len -= (offset - begin);
3200
3201 if (len > length)
3202 len = length;
3203 if (len < 0)
3204 len = 0;
3205
3206 return len;
3207}
3208#endif
3209
3210static struct xfrm_mgr pfkeyv2_mgr =
3211{
3212 .id = "pfkeyv2",
3213 .notify = pfkey_send_notify,
3214 .acquire = pfkey_send_acquire,
3215 .compile_policy = pfkey_compile_policy,
3216 .new_mapping = pfkey_send_new_mapping,
26b15dad 3217 .notify_policy = pfkey_send_policy_notify,
1da177e4
LT		 3218};
3219
3220static void __exit ipsec_pfkey_exit(void)
3221{
3222 xfrm_unregister_km(&pfkeyv2_mgr);
3223 remove_proc_entry("net/pfkey", NULL);
3224 sock_unregister(PF_KEY);
3225 proto_unregister(&key_proto);
3226}
3227
3228static int __init ipsec_pfkey_init(void)
3229{
3230 int err = proto_register(&key_proto, 0);
3231
3232 if (err != 0)
3233 goto out;
3234
3235 err = sock_register(&pfkey_family_ops);
3236 if (err != 0)
3237 goto out_unregister_key_proto;
3238#ifdef CONFIG_PROC_FS
3239 err = -ENOMEM;
3240 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3241 goto out_sock_unregister;
3242#endif
3243 err = xfrm_register_km(&pfkeyv2_mgr);
3244 if (err != 0)
3245 goto out_remove_proc_entry;
3246out:
3247 return err;
3248out_remove_proc_entry:
3249#ifdef CONFIG_PROC_FS
3250 remove_proc_entry("net/pfkey", NULL);
3251out_sock_unregister:
3252#endif
3253 sock_unregister(PF_KEY);
3254out_unregister_key_proto:
3255 proto_unregister(&key_proto);
3256 goto out;
3257}
3258
3259module_init(ipsec_pfkey_init);
3260module_exit(ipsec_pfkey_exit);
3261MODULE_LICENSE("GPL");
3262MODULE_ALIAS_NETPROTO(PF_KEY);
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