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coral / linux-imx / f60f6b8f70c756fc786d68f02ec17a1e84db645f / . / net / key / af_key.c
blob: 577f0bb5bb31816bb1ecf94848ae2758d9c2cbcf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
116static struct proto_ops pfkey_ops;
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,
188 int allocation, struct sock *sk)
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
220static int pfkey_broadcast(struct sk_buff *skb, int allocation,
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;
300 if (err <= 0 || err >= 256)
301 BUG();
302
303 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
304 pfkey_hdr_dup(hdr, orig);
305 hdr->sadb_msg_errno = (uint8_t) err;
306 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
307 sizeof(uint64_t));
308
309 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
310
311 return 0;
312}
313
314static u8 sadb_ext_min_len[] = {
315 [SADB_EXT_RESERVED] = (u8) 0,
316 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
317 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
318 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
319 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
320 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
321 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
322 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
323 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
324 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
325 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
326 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
327 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
328 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
329 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
330 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
331 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
332 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
333 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
334 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
335 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
336 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
337 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
338 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
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
386static int present_and_same_family(struct sadb_address *src,
387 struct sadb_address *dst)
388{
389 struct sockaddr *s_addr, *d_addr;
390
391 if (!src || !dst)
392 return 0;
393
394 s_addr = (struct sockaddr *)(src + 1);
395 d_addr = (struct sockaddr *)(dst + 1);
396 if (s_addr->sa_family != d_addr->sa_family)
397 return 0;
398 if (s_addr->sa_family != AF_INET
399#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
400 && s_addr->sa_family != AF_INET6
401#endif
402 )
403 return 0;
404
405 return 1;
406}
407
408static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
409{
410 char *p = (char *) hdr;
411 int len = skb->len;
412
413 len -= sizeof(*hdr);
414 p += sizeof(*hdr);
415 while (len > 0) {
416 struct sadb_ext *ehdr = (struct sadb_ext *) p;
417 uint16_t ext_type;
418 int ext_len;
419
420 ext_len = ehdr->sadb_ext_len;
421 ext_len *= sizeof(uint64_t);
422 ext_type = ehdr->sadb_ext_type;
423 if (ext_len < sizeof(uint64_t) ||
424 ext_len > len ||
425 ext_type == SADB_EXT_RESERVED)
426 return -EINVAL;
427
428 if (ext_type <= SADB_EXT_MAX) {
429 int min = (int) sadb_ext_min_len[ext_type];
430 if (ext_len < min)
431 return -EINVAL;
432 if (ext_hdrs[ext_type-1] != NULL)
433 return -EINVAL;
434 if (ext_type == SADB_EXT_ADDRESS_SRC ||
435 ext_type == SADB_EXT_ADDRESS_DST ||
436 ext_type == SADB_EXT_ADDRESS_PROXY ||
437 ext_type == SADB_X_EXT_NAT_T_OA) {
438 if (verify_address_len(p))
439 return -EINVAL;
440 }
441 ext_hdrs[ext_type-1] = p;
442 }
443 p += ext_len;
444 len -= ext_len;
445 }
446
447 return 0;
448}
449
450static uint16_t
451pfkey_satype2proto(uint8_t satype)
452{
453 switch (satype) {
454 case SADB_SATYPE_UNSPEC:
455 return IPSEC_PROTO_ANY;
456 case SADB_SATYPE_AH:
457 return IPPROTO_AH;
458 case SADB_SATYPE_ESP:
459 return IPPROTO_ESP;
460 case SADB_X_SATYPE_IPCOMP:
461 return IPPROTO_COMP;
462 break;
463 default:
464 return 0;
465 }
466 /* NOTREACHED */
467}
468
469static uint8_t
470pfkey_proto2satype(uint16_t proto)
471{
472 switch (proto) {
473 case IPPROTO_AH:
474 return SADB_SATYPE_AH;
475 case IPPROTO_ESP:
476 return SADB_SATYPE_ESP;
477 case IPPROTO_COMP:
478 return SADB_X_SATYPE_IPCOMP;
479 break;
480 default:
481 return 0;
482 }
483 /* NOTREACHED */
484}
485
486/* BTW, this scheme means that there is no way with PFKEY2 sockets to
487 * say specifically 'just raw sockets' as we encode them as 255.
488 */
489
490static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
491{
492 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
493}
494
495static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
496{
497 return (proto ? proto : IPSEC_PROTO_ANY);
498}
499
500static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
501 xfrm_address_t *xaddr)
502{
503 switch (((struct sockaddr*)(addr + 1))->sa_family) {
504 case AF_INET:
505 xaddr->a4 =
506 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
507 return AF_INET;
508#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
509 case AF_INET6:
510 memcpy(xaddr->a6,
511 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
512 sizeof(struct in6_addr));
513 return AF_INET6;
514#endif
515 default:
516 return 0;
517 }
518 /* NOTREACHED */
519}
520
521static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
522{
523 struct sadb_sa *sa;
524 struct sadb_address *addr;
525 uint16_t proto;
526 unsigned short family;
527 xfrm_address_t *xaddr;
528
529 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
530 if (sa == NULL)
531 return NULL;
532
533 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
534 if (proto == 0)
535 return NULL;
536
537 /* sadb_address_len should be checked by caller */
538 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
539 if (addr == NULL)
540 return NULL;
541
542 family = ((struct sockaddr *)(addr + 1))->sa_family;
543 switch (family) {
544 case AF_INET:
545 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
546 break;
547#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
548 case AF_INET6:
549 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
550 break;
551#endif
552 default:
553 xaddr = NULL;
554 }
555
556 if (!xaddr)
557 return NULL;
558
559 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
560}
561
562#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
563static int
564pfkey_sockaddr_size(sa_family_t family)
565{
566 switch (family) {
567 case AF_INET:
568 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
569#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
570 case AF_INET6:
571 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
572#endif
573 default:
574 return 0;
575 }
576 /* NOTREACHED */
577}
578
579static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
580{
581 struct sk_buff *skb;
582 struct sadb_msg *hdr;
583 struct sadb_sa *sa;
584 struct sadb_lifetime *lifetime;
585 struct sadb_address *addr;
586 struct sadb_key *key;
587 struct sadb_x_sa2 *sa2;
588 struct sockaddr_in *sin;
589#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
590 struct sockaddr_in6 *sin6;
591#endif
592 int size;
593 int auth_key_size = 0;
594 int encrypt_key_size = 0;
595 int sockaddr_size;
596 struct xfrm_encap_tmpl *natt = NULL;
597
598 /* address family check */
599 sockaddr_size = pfkey_sockaddr_size(x->props.family);
600 if (!sockaddr_size)
601 return ERR_PTR(-EINVAL);
602
603 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
604 key(AE), (identity(SD),) (sensitivity)> */
605 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
606 sizeof(struct sadb_lifetime) +
607 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
608 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
609 sizeof(struct sadb_address)*2 +
610 sockaddr_size*2 +
611 sizeof(struct sadb_x_sa2);
612 /* identity & sensitivity */
613
614 if ((x->props.family == AF_INET &&
615 x->sel.saddr.a4 != x->props.saddr.a4)
616#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
617 || (x->props.family == AF_INET6 &&
618 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
619#endif
620 )
621 size += sizeof(struct sadb_address) + sockaddr_size;
622
623 if (add_keys) {
624 if (x->aalg && x->aalg->alg_key_len) {
625 auth_key_size =
626 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
627 size += sizeof(struct sadb_key) + auth_key_size;
628 }
629 if (x->ealg && x->ealg->alg_key_len) {
630 encrypt_key_size =
631 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
632 size += sizeof(struct sadb_key) + encrypt_key_size;
633 }
634 }
635 if (x->encap)
636 natt = x->encap;
637
638 if (natt && natt->encap_type) {
639 size += sizeof(struct sadb_x_nat_t_type);
640 size += sizeof(struct sadb_x_nat_t_port);
641 size += sizeof(struct sadb_x_nat_t_port);
642 }
643
644 skb = alloc_skb(size + 16, GFP_ATOMIC);
645 if (skb == NULL)
646 return ERR_PTR(-ENOBUFS);
647
648 /* call should fill header later */
649 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
650 memset(hdr, 0, size); /* XXX do we need this ? */
651 hdr->sadb_msg_len = size / sizeof(uint64_t);
652
653 /* sa */
654 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
655 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
656 sa->sadb_sa_exttype = SADB_EXT_SA;
657 sa->sadb_sa_spi = x->id.spi;
658 sa->sadb_sa_replay = x->props.replay_window;
Herbert Xu4f09f0b2005-06-18 22:43:43 -0700[diff] [blame]659 switch (x->km.state) {
660 case XFRM_STATE_VALID:
661 sa->sadb_sa_state = x->km.dying ?
662 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
663 break;
664 case XFRM_STATE_ACQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]665 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
Herbert Xu4f09f0b2005-06-18 22:43:43 -0700[diff] [blame]666 break;
667 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]668 sa->sadb_sa_state = SADB_SASTATE_DEAD;
Herbert Xu4f09f0b2005-06-18 22:43:43 -0700[diff] [blame]669 break;
670 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]671 sa->sadb_sa_auth = 0;
672 if (x->aalg) {
673 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
674 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
675 }
676 sa->sadb_sa_encrypt = 0;
677 BUG_ON(x->ealg && x->calg);
678 if (x->ealg) {
679 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
680 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
681 }
682 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
683 if (x->calg) {
684 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
685 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
686 }
687
688 sa->sadb_sa_flags = 0;
689 if (x->props.flags & XFRM_STATE_NOECN)
690 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
691 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
692 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
693
694 /* hard time */
695 if (hsc & 2) {
696 lifetime = (struct sadb_lifetime *) skb_put(skb,
697 sizeof(struct sadb_lifetime));
698 lifetime->sadb_lifetime_len =
699 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
700 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
701 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
702 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
703 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
704 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
705 }
706 /* soft time */
707 if (hsc & 1) {
708 lifetime = (struct sadb_lifetime *) skb_put(skb,
709 sizeof(struct sadb_lifetime));
710 lifetime->sadb_lifetime_len =
711 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
712 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
713 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
714 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
715 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
716 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
717 }
718 /* current time */
719 lifetime = (struct sadb_lifetime *) skb_put(skb,
720 sizeof(struct sadb_lifetime));
721 lifetime->sadb_lifetime_len =
722 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
723 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
724 lifetime->sadb_lifetime_allocations = x->curlft.packets;
725 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
726 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
727 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
728 /* src address */
729 addr = (struct sadb_address*) skb_put(skb,
730 sizeof(struct sadb_address)+sockaddr_size);
731 addr->sadb_address_len =
732 (sizeof(struct sadb_address)+sockaddr_size)/
733 sizeof(uint64_t);
734 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
735 /* "if the ports are non-zero, then the sadb_address_proto field,
736 normally zero, MUST be filled in with the transport
737 protocol's number." - RFC2367 */
738 addr->sadb_address_proto = 0;
739 addr->sadb_address_reserved = 0;
740 if (x->props.family == AF_INET) {
741 addr->sadb_address_prefixlen = 32;
742
743 sin = (struct sockaddr_in *) (addr + 1);
744 sin->sin_family = AF_INET;
745 sin->sin_addr.s_addr = x->props.saddr.a4;
746 sin->sin_port = 0;
747 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
748 }
749#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
750 else if (x->props.family == AF_INET6) {
751 addr->sadb_address_prefixlen = 128;
752
753 sin6 = (struct sockaddr_in6 *) (addr + 1);
754 sin6->sin6_family = AF_INET6;
755 sin6->sin6_port = 0;
756 sin6->sin6_flowinfo = 0;
757 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
758 sizeof(struct in6_addr));
759 sin6->sin6_scope_id = 0;
760 }
761#endif
762 else
763 BUG();
764
765 /* dst address */
766 addr = (struct sadb_address*) skb_put(skb,
767 sizeof(struct sadb_address)+sockaddr_size);
768 addr->sadb_address_len =
769 (sizeof(struct sadb_address)+sockaddr_size)/
770 sizeof(uint64_t);
771 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
772 addr->sadb_address_proto = 0;
773 addr->sadb_address_prefixlen = 32; /* XXX */
774 addr->sadb_address_reserved = 0;
775 if (x->props.family == AF_INET) {
776 sin = (struct sockaddr_in *) (addr + 1);
777 sin->sin_family = AF_INET;
778 sin->sin_addr.s_addr = x->id.daddr.a4;
779 sin->sin_port = 0;
780 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
781
782 if (x->sel.saddr.a4 != x->props.saddr.a4) {
783 addr = (struct sadb_address*) skb_put(skb,
784 sizeof(struct sadb_address)+sockaddr_size);
785 addr->sadb_address_len =
786 (sizeof(struct sadb_address)+sockaddr_size)/
787 sizeof(uint64_t);
788 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
789 addr->sadb_address_proto =
790 pfkey_proto_from_xfrm(x->sel.proto);
791 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
792 addr->sadb_address_reserved = 0;
793
794 sin = (struct sockaddr_in *) (addr + 1);
795 sin->sin_family = AF_INET;
796 sin->sin_addr.s_addr = x->sel.saddr.a4;
797 sin->sin_port = x->sel.sport;
798 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
799 }
800 }
801#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
802 else if (x->props.family == AF_INET6) {
803 addr->sadb_address_prefixlen = 128;
804
805 sin6 = (struct sockaddr_in6 *) (addr + 1);
806 sin6->sin6_family = AF_INET6;
807 sin6->sin6_port = 0;
808 sin6->sin6_flowinfo = 0;
809 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
810 sin6->sin6_scope_id = 0;
811
812 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
813 sizeof(struct in6_addr))) {
814 addr = (struct sadb_address *) skb_put(skb,
815 sizeof(struct sadb_address)+sockaddr_size);
816 addr->sadb_address_len =
817 (sizeof(struct sadb_address)+sockaddr_size)/
818 sizeof(uint64_t);
819 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
820 addr->sadb_address_proto =
821 pfkey_proto_from_xfrm(x->sel.proto);
822 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
823 addr->sadb_address_reserved = 0;
824
825 sin6 = (struct sockaddr_in6 *) (addr + 1);
826 sin6->sin6_family = AF_INET6;
827 sin6->sin6_port = x->sel.sport;
828 sin6->sin6_flowinfo = 0;
829 memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
830 sizeof(struct in6_addr));
831 sin6->sin6_scope_id = 0;
832 }
833 }
834#endif
835 else
836 BUG();
837
838 /* auth key */
839 if (add_keys && auth_key_size) {
840 key = (struct sadb_key *) skb_put(skb,
841 sizeof(struct sadb_key)+auth_key_size);
842 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
843 sizeof(uint64_t);
844 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
845 key->sadb_key_bits = x->aalg->alg_key_len;
846 key->sadb_key_reserved = 0;
847 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
848 }
849 /* encrypt key */
850 if (add_keys && encrypt_key_size) {
851 key = (struct sadb_key *) skb_put(skb,
852 sizeof(struct sadb_key)+encrypt_key_size);
853 key->sadb_key_len = (sizeof(struct sadb_key) +
854 encrypt_key_size) / sizeof(uint64_t);
855 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
856 key->sadb_key_bits = x->ealg->alg_key_len;
857 key->sadb_key_reserved = 0;
858 memcpy(key + 1, x->ealg->alg_key,
859 (x->ealg->alg_key_len+7)/8);
860 }
861
862 /* sa */
863 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
864 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
865 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
866 sa2->sadb_x_sa2_mode = x->props.mode + 1;
867 sa2->sadb_x_sa2_reserved1 = 0;
868 sa2->sadb_x_sa2_reserved2 = 0;
869 sa2->sadb_x_sa2_sequence = 0;
870 sa2->sadb_x_sa2_reqid = x->props.reqid;
871
872 if (natt && natt->encap_type) {
873 struct sadb_x_nat_t_type *n_type;
874 struct sadb_x_nat_t_port *n_port;
875
876 /* type */
877 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
878 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
879 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
880 n_type->sadb_x_nat_t_type_type = natt->encap_type;
881 n_type->sadb_x_nat_t_type_reserved[0] = 0;
882 n_type->sadb_x_nat_t_type_reserved[1] = 0;
883 n_type->sadb_x_nat_t_type_reserved[2] = 0;
884
885 /* source port */
886 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
887 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
888 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
889 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
890 n_port->sadb_x_nat_t_port_reserved = 0;
891
892 /* dest port */
893 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
894 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
895 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
896 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
897 n_port->sadb_x_nat_t_port_reserved = 0;
898 }
899
900 return skb;
901}
902
903static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
904 void **ext_hdrs)
905{
906 struct xfrm_state *x;
907 struct sadb_lifetime *lifetime;
908 struct sadb_sa *sa;
909 struct sadb_key *key;
910 uint16_t proto;
911 int err;
912
913
914 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
915 if (!sa ||
916 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
917 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
918 return ERR_PTR(-EINVAL);
919 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
920 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
921 return ERR_PTR(-EINVAL);
922 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
923 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
924 return ERR_PTR(-EINVAL);
925 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
926 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
927 return ERR_PTR(-EINVAL);
928
929 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
930 if (proto == 0)
931 return ERR_PTR(-EINVAL);
932
933 /* default error is no buffer space */
934 err = -ENOBUFS;
935
936 /* RFC2367:
937
938 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
939 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
940 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
941 Therefore, the sadb_sa_state field of all submitted SAs MUST be
942 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
943 not true.
944
945 However, KAME setkey always uses SADB_SASTATE_LARVAL.
946 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
947 */
948 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
949 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
950 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
951 sa->sadb_sa_encrypt > SADB_EALG_MAX)
952 return ERR_PTR(-EINVAL);
953 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
954 if (key != NULL &&
955 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
956 ((key->sadb_key_bits+7) / 8 == 0 ||
957 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
958 return ERR_PTR(-EINVAL);
959 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
960 if (key != NULL &&
961 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
962 ((key->sadb_key_bits+7) / 8 == 0 ||
963 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
964 return ERR_PTR(-EINVAL);
965
966 x = xfrm_state_alloc();
967 if (x == NULL)
968 return ERR_PTR(-ENOBUFS);
969
970 x->id.proto = proto;
971 x->id.spi = sa->sadb_sa_spi;
972 x->props.replay_window = sa->sadb_sa_replay;
973 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
974 x->props.flags |= XFRM_STATE_NOECN;
975 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
976 x->props.flags |= XFRM_STATE_DECAP_DSCP;
977
978 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
979 if (lifetime != NULL) {
980 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
981 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
982 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
983 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
984 }
985 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
986 if (lifetime != NULL) {
987 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
988 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
989 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
990 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
991 }
992 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
993 if (sa->sadb_sa_auth) {
994 int keysize = 0;
995 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
996 if (!a) {
997 err = -ENOSYS;
998 goto out;
999 }
1000 if (key)
1001 keysize = (key->sadb_key_bits + 7) / 8;
1002 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1003 if (!x->aalg)
1004 goto out;
1005 strcpy(x->aalg->alg_name, a->name);
1006 x->aalg->alg_key_len = 0;
1007 if (key) {
1008 x->aalg->alg_key_len = key->sadb_key_bits;
1009 memcpy(x->aalg->alg_key, key+1, keysize);
1010 }
1011 x->props.aalgo = sa->sadb_sa_auth;
1012 /* x->algo.flags = sa->sadb_sa_flags; */
1013 }
1014 if (sa->sadb_sa_encrypt) {
1015 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1016 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1017 if (!a) {
1018 err = -ENOSYS;
1019 goto out;
1020 }
1021 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1022 if (!x->calg)
1023 goto out;
1024 strcpy(x->calg->alg_name, a->name);
1025 x->props.calgo = sa->sadb_sa_encrypt;
1026 } else {
1027 int keysize = 0;
1028 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1029 if (!a) {
1030 err = -ENOSYS;
1031 goto out;
1032 }
1033 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1034 if (key)
1035 keysize = (key->sadb_key_bits + 7) / 8;
1036 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1037 if (!x->ealg)
1038 goto out;
1039 strcpy(x->ealg->alg_name, a->name);
1040 x->ealg->alg_key_len = 0;
1041 if (key) {
1042 x->ealg->alg_key_len = key->sadb_key_bits;
1043 memcpy(x->ealg->alg_key, key+1, keysize);
1044 }
1045 x->props.ealgo = sa->sadb_sa_encrypt;
1046 }
1047 }
1048 /* x->algo.flags = sa->sadb_sa_flags; */
1049
1050 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1051 &x->props.saddr);
1052 if (!x->props.family) {
1053 err = -EAFNOSUPPORT;
1054 goto out;
1055 }
1056 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1057 &x->id.daddr);
1058
1059 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1060 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1061 x->props.mode = sa2->sadb_x_sa2_mode;
1062 if (x->props.mode)
1063 x->props.mode--;
1064 x->props.reqid = sa2->sadb_x_sa2_reqid;
1065 }
1066
1067 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1068 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1069
1070 /* Nobody uses this, but we try. */
1071 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1072 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1073 }
1074
1075 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1076 struct sadb_x_nat_t_type* n_type;
1077 struct xfrm_encap_tmpl *natt;
1078
1079 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1080 if (!x->encap)
1081 goto out;
1082
1083 natt = x->encap;
1084 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1085 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1086
1087 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1088 struct sadb_x_nat_t_port* n_port =
1089 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1090 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1091 }
1092 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1093 struct sadb_x_nat_t_port* n_port =
1094 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1095 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1096 }
1097 }
1098
1099 x->type = xfrm_get_type(proto, x->props.family);
1100 if (x->type == NULL) {
1101 err = -ENOPROTOOPT;
1102 goto out;
1103 }
1104 if (x->type->init_state(x, NULL)) {
1105 err = -EINVAL;
1106 goto out;
1107 }
1108 x->km.seq = hdr->sadb_msg_seq;
1109 x->km.state = XFRM_STATE_VALID;
1110 return x;
1111
1112out:
1113 x->km.state = XFRM_STATE_DEAD;
1114 xfrm_state_put(x);
1115 return ERR_PTR(err);
1116}
1117
1118static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1119{
1120 return -EOPNOTSUPP;
1121}
1122
1123static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1124{
1125 struct sk_buff *resp_skb;
1126 struct sadb_x_sa2 *sa2;
1127 struct sadb_address *saddr, *daddr;
1128 struct sadb_msg *out_hdr;
1129 struct xfrm_state *x = NULL;
1130 u8 mode;
1131 u32 reqid;
1132 u8 proto;
1133 unsigned short family;
1134 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1135
1136 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1137 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1138 return -EINVAL;
1139
1140 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1141 if (proto == 0)
1142 return -EINVAL;
1143
1144 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1145 mode = sa2->sadb_x_sa2_mode - 1;
1146 reqid = sa2->sadb_x_sa2_reqid;
1147 } else {
1148 mode = 0;
1149 reqid = 0;
1150 }
1151
1152 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1153 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1154
1155 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1156 switch (family) {
1157 case AF_INET:
1158 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1159 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1160 break;
1161#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1162 case AF_INET6:
1163 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1164 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1165 break;
1166#endif
1167 }
1168
1169 if (hdr->sadb_msg_seq) {
1170 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1171 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1172 xfrm_state_put(x);
1173 x = NULL;
1174 }
1175 }
1176
1177 if (!x)
1178 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1179
1180 if (x == NULL)
1181 return -ENOENT;
1182
1183 resp_skb = ERR_PTR(-ENOENT);
1184
1185 spin_lock_bh(&x->lock);
1186 if (x->km.state != XFRM_STATE_DEAD) {
1187 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1188 u32 min_spi, max_spi;
1189
1190 if (range != NULL) {
1191 min_spi = range->sadb_spirange_min;
1192 max_spi = range->sadb_spirange_max;
1193 } else {
1194 min_spi = 0x100;
1195 max_spi = 0x0fffffff;
1196 }
1197 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1198 if (x->id.spi)
1199 resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1200 }
1201 spin_unlock_bh(&x->lock);
1202
1203 if (IS_ERR(resp_skb)) {
1204 xfrm_state_put(x);
1205 return PTR_ERR(resp_skb);
1206 }
1207
1208 out_hdr = (struct sadb_msg *) resp_skb->data;
1209 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1210 out_hdr->sadb_msg_type = SADB_GETSPI;
1211 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1212 out_hdr->sadb_msg_errno = 0;
1213 out_hdr->sadb_msg_reserved = 0;
1214 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1215 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1216
1217 xfrm_state_put(x);
1218
1219 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1220
1221 return 0;
1222}
1223
1224static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1225{
1226 struct xfrm_state *x;
1227
1228 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1229 return -EOPNOTSUPP;
1230
1231 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1232 return 0;
1233
1234 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1235 if (x == NULL)
1236 return 0;
1237
1238 spin_lock_bh(&x->lock);
1239 if (x->km.state == XFRM_STATE_ACQ) {
1240 x->km.state = XFRM_STATE_ERROR;
1241 wake_up(&km_waitq);
1242 }
1243 spin_unlock_bh(&x->lock);
1244 xfrm_state_put(x);
1245 return 0;
1246}
1247
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1248static inline int event2poltype(int event)
1249{
1250 switch (event) {
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1251 case XFRM_MSG_DELPOLICY:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1252 return SADB_X_SPDDELETE;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1253 case XFRM_MSG_NEWPOLICY:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1254 return SADB_X_SPDADD;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1255 case XFRM_MSG_UPDPOLICY:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1256 return SADB_X_SPDUPDATE;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1257 case XFRM_MSG_POLEXPIRE:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1258 // return SADB_X_SPDEXPIRE;
1259 default:
1260 printk("pfkey: Unknown policy event %d\n", event);
1261 break;
1262 }
1263
1264 return 0;
1265}
1266
1267static inline int event2keytype(int event)
1268{
1269 switch (event) {
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1270 case XFRM_MSG_DELSA:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1271 return SADB_DELETE;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1272 case XFRM_MSG_NEWSA:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1273 return SADB_ADD;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1274 case XFRM_MSG_UPDSA:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1275 return SADB_UPDATE;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1276 case XFRM_MSG_EXPIRE:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1277 return SADB_EXPIRE;
1278 default:
1279 printk("pfkey: Unknown SA event %d\n", event);
1280 break;
1281 }
1282
1283 return 0;
1284}
1285
1286/* ADD/UPD/DEL */
1287static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1288{
1289 struct sk_buff *skb;
1290 struct sadb_msg *hdr;
1291 int hsc = 3;
1292
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1293 if (c->event == XFRM_MSG_DELSA)
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1294 hsc = 0;
1295
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1296 skb = pfkey_xfrm_state2msg(x, 0, hsc);
1297
1298 if (IS_ERR(skb))
1299 return PTR_ERR(skb);
1300
1301 hdr = (struct sadb_msg *) skb->data;
1302 hdr->sadb_msg_version = PF_KEY_V2;
1303 hdr->sadb_msg_type = event2keytype(c->event);
1304 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1305 hdr->sadb_msg_errno = 0;
1306 hdr->sadb_msg_reserved = 0;
1307 hdr->sadb_msg_seq = c->seq;
1308 hdr->sadb_msg_pid = c->pid;
1309
1310 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1311
1312 return 0;
1313}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1314
1315static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1316{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1317 struct xfrm_state *x;
1318 int err;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1319 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1320
1321 xfrm_probe_algs();
1322
1323 x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1324 if (IS_ERR(x))
1325 return PTR_ERR(x);
1326
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1327 xfrm_state_hold(x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1328 if (hdr->sadb_msg_type == SADB_ADD)
1329 err = xfrm_state_add(x);
1330 else
1331 err = xfrm_state_update(x);
1332
1333 if (err < 0) {
1334 x->km.state = XFRM_STATE_DEAD;
1335 xfrm_state_put(x);
1336 return err;
1337 }
1338
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1339 if (hdr->sadb_msg_type == SADB_ADD)
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1340 c.event = XFRM_MSG_NEWSA;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1341 else
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1342 c.event = XFRM_MSG_UPDSA;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1343 c.seq = hdr->sadb_msg_seq;
1344 c.pid = hdr->sadb_msg_pid;
1345 km_state_notify(x, &c);
1346 xfrm_state_put(x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1347
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1348 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1349}
1350
1351static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1352{
1353 struct xfrm_state *x;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1354 struct km_event c;
1355 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1356
1357 if (!ext_hdrs[SADB_EXT_SA-1] ||
1358 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1359 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1360 return -EINVAL;
1361
1362 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1363 if (x == NULL)
1364 return -ESRCH;
1365
1366 if (xfrm_state_kern(x)) {
1367 xfrm_state_put(x);
1368 return -EPERM;
1369 }
1370
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1371 err = xfrm_state_delete(x);
1372 if (err < 0) {
1373 xfrm_state_put(x);
1374 return err;
1375 }
1376
1377 c.seq = hdr->sadb_msg_seq;
1378 c.pid = hdr->sadb_msg_pid;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1379 c.event = XFRM_MSG_DELSA;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1380 km_state_notify(x, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1381 xfrm_state_put(x);
1382
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1383 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1384}
1385
1386static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1387{
1388 __u8 proto;
1389 struct sk_buff *out_skb;
1390 struct sadb_msg *out_hdr;
1391 struct xfrm_state *x;
1392
1393 if (!ext_hdrs[SADB_EXT_SA-1] ||
1394 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1395 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1396 return -EINVAL;
1397
1398 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1399 if (x == NULL)
1400 return -ESRCH;
1401
1402 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1403 proto = x->id.proto;
1404 xfrm_state_put(x);
1405 if (IS_ERR(out_skb))
1406 return PTR_ERR(out_skb);
1407
1408 out_hdr = (struct sadb_msg *) out_skb->data;
1409 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1410 out_hdr->sadb_msg_type = SADB_DUMP;
1411 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1412 out_hdr->sadb_msg_errno = 0;
1413 out_hdr->sadb_msg_reserved = 0;
1414 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1415 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1416 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1417
1418 return 0;
1419}
1420
1421static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1422{
1423 struct sk_buff *skb;
1424 struct sadb_msg *hdr;
1425 int len, auth_len, enc_len, i;
1426
1427 auth_len = xfrm_count_auth_supported();
1428 if (auth_len) {
1429 auth_len *= sizeof(struct sadb_alg);
1430 auth_len += sizeof(struct sadb_supported);
1431 }
1432
1433 enc_len = xfrm_count_enc_supported();
1434 if (enc_len) {
1435 enc_len *= sizeof(struct sadb_alg);
1436 enc_len += sizeof(struct sadb_supported);
1437 }
1438
1439 len = enc_len + auth_len + sizeof(struct sadb_msg);
1440
1441 skb = alloc_skb(len + 16, allocation);
1442 if (!skb)
1443 goto out_put_algs;
1444
1445 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1446 pfkey_hdr_dup(hdr, orig);
1447 hdr->sadb_msg_errno = 0;
1448 hdr->sadb_msg_len = len / sizeof(uint64_t);
1449
1450 if (auth_len) {
1451 struct sadb_supported *sp;
1452 struct sadb_alg *ap;
1453
1454 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1455 ap = (struct sadb_alg *) (sp + 1);
1456
1457 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1458 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1459
1460 for (i = 0; ; i++) {
1461 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1462 if (!aalg)
1463 break;
1464 if (aalg->available)
1465 *ap++ = aalg->desc;
1466 }
1467 }
1468
1469 if (enc_len) {
1470 struct sadb_supported *sp;
1471 struct sadb_alg *ap;
1472
1473 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1474 ap = (struct sadb_alg *) (sp + 1);
1475
1476 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1477 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1478
1479 for (i = 0; ; i++) {
1480 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1481 if (!ealg)
1482 break;
1483 if (ealg->available)
1484 *ap++ = ealg->desc;
1485 }
1486 }
1487
1488out_put_algs:
1489 return skb;
1490}
1491
1492static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1493{
1494 struct pfkey_sock *pfk = pfkey_sk(sk);
1495 struct sk_buff *supp_skb;
1496
1497 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1498 return -EINVAL;
1499
1500 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1501 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1502 return -EEXIST;
1503 pfk->registered |= (1<<hdr->sadb_msg_satype);
1504 }
1505
1506 xfrm_probe_algs();
1507
1508 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1509 if (!supp_skb) {
1510 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1511 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1512
1513 return -ENOBUFS;
1514 }
1515
1516 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1517
1518 return 0;
1519}
1520
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1521static int key_notify_sa_flush(struct km_event *c)
1522{
1523 struct sk_buff *skb;
1524 struct sadb_msg *hdr;
1525
1526 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1527 if (!skb)
1528 return -ENOBUFS;
1529 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
Herbert Xubf088672005-06-18 22:44:00 -0700[diff] [blame]1530 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1531 hdr->sadb_msg_seq = c->seq;
1532 hdr->sadb_msg_pid = c->pid;
1533 hdr->sadb_msg_version = PF_KEY_V2;
1534 hdr->sadb_msg_errno = (uint8_t) 0;
1535 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1536
1537 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1538
1539 return 0;
1540}
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1542static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1543{
1544 unsigned proto;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1545 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1546
1547 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1548 if (proto == 0)
1549 return -EINVAL;
1550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1551 xfrm_state_flush(proto);
Herbert Xubf088672005-06-18 22:44:00 -0700[diff] [blame]1552 c.data.proto = proto;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1553 c.seq = hdr->sadb_msg_seq;
1554 c.pid = hdr->sadb_msg_pid;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1555 c.event = XFRM_MSG_FLUSHSA;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1556 km_state_notify(NULL, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1557
1558 return 0;
1559}
1560
1561struct pfkey_dump_data
1562{
1563 struct sk_buff *skb;
1564 struct sadb_msg *hdr;
1565 struct sock *sk;
1566};
1567
1568static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1569{
1570 struct pfkey_dump_data *data = ptr;
1571 struct sk_buff *out_skb;
1572 struct sadb_msg *out_hdr;
1573
1574 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1575 if (IS_ERR(out_skb))
1576 return PTR_ERR(out_skb);
1577
1578 out_hdr = (struct sadb_msg *) out_skb->data;
1579 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1580 out_hdr->sadb_msg_type = SADB_DUMP;
1581 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1582 out_hdr->sadb_msg_errno = 0;
1583 out_hdr->sadb_msg_reserved = 0;
1584 out_hdr->sadb_msg_seq = count;
1585 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1586 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1587 return 0;
1588}
1589
1590static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1591{
1592 u8 proto;
1593 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1594
1595 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1596 if (proto == 0)
1597 return -EINVAL;
1598
1599 return xfrm_state_walk(proto, dump_sa, &data);
1600}
1601
1602static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1603{
1604 struct pfkey_sock *pfk = pfkey_sk(sk);
1605 int satype = hdr->sadb_msg_satype;
1606
1607 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1608 /* XXX we mangle packet... */
1609 hdr->sadb_msg_errno = 0;
1610 if (satype != 0 && satype != 1)
1611 return -EINVAL;
1612 pfk->promisc = satype;
1613 }
1614 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1615 return 0;
1616}
1617
1618static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1619{
1620 int i;
1621 u32 reqid = *(u32*)ptr;
1622
1623 for (i=0; i<xp->xfrm_nr; i++) {
1624 if (xp->xfrm_vec[i].reqid == reqid)
1625 return -EEXIST;
1626 }
1627 return 0;
1628}
1629
1630static u32 gen_reqid(void)
1631{
1632 u32 start;
1633 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1634
1635 start = reqid;
1636 do {
1637 ++reqid;
1638 if (reqid == 0)
1639 reqid = IPSEC_MANUAL_REQID_MAX+1;
1640 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1641 return reqid;
1642 } while (reqid != start);
1643 return 0;
1644}
1645
1646static int
1647parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1648{
1649 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1650 struct sockaddr_in *sin;
1651#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1652 struct sockaddr_in6 *sin6;
1653#endif
1654
1655 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1656 return -ELOOP;
1657
1658 if (rq->sadb_x_ipsecrequest_mode == 0)
1659 return -EINVAL;
1660
1661 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1662 t->mode = rq->sadb_x_ipsecrequest_mode-1;
1663 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1664 t->optional = 1;
1665 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1666 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1667 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1668 t->reqid = 0;
1669 if (!t->reqid && !(t->reqid = gen_reqid()))
1670 return -ENOBUFS;
1671 }
1672
1673 /* addresses present only in tunnel mode */
1674 if (t->mode) {
1675 switch (xp->family) {
1676 case AF_INET:
1677 sin = (void*)(rq+1);
1678 if (sin->sin_family != AF_INET)
1679 return -EINVAL;
1680 t->saddr.a4 = sin->sin_addr.s_addr;
1681 sin++;
1682 if (sin->sin_family != AF_INET)
1683 return -EINVAL;
1684 t->id.daddr.a4 = sin->sin_addr.s_addr;
1685 break;
1686#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1687 case AF_INET6:
1688 sin6 = (void *)(rq+1);
1689 if (sin6->sin6_family != AF_INET6)
1690 return -EINVAL;
1691 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1692 sin6++;
1693 if (sin6->sin6_family != AF_INET6)
1694 return -EINVAL;
1695 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1696 break;
1697#endif
1698 default:
1699 return -EINVAL;
1700 }
1701 }
1702 /* No way to set this via kame pfkey */
1703 t->aalgos = t->ealgos = t->calgos = ~0;
1704 xp->xfrm_nr++;
1705 return 0;
1706}
1707
1708static int
1709parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1710{
1711 int err;
1712 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1713 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1714
1715 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1716 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1717 return err;
1718 len -= rq->sadb_x_ipsecrequest_len;
1719 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1720 }
1721 return 0;
1722}
1723
1724static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1725{
1726 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1727 int socklen = (xp->family == AF_INET ?
1728 sizeof(struct sockaddr_in) :
1729 sizeof(struct sockaddr_in6));
1730
1731 return sizeof(struct sadb_msg) +
1732 (sizeof(struct sadb_lifetime) * 3) +
1733 (sizeof(struct sadb_address) * 2) +
1734 (sockaddr_size * 2) +
1735 sizeof(struct sadb_x_policy) +
1736 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1737 (socklen * 2)));
1738}
1739
1740static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1741{
1742 struct sk_buff *skb;
1743 int size;
1744
1745 size = pfkey_xfrm_policy2msg_size(xp);
1746
1747 skb = alloc_skb(size + 16, GFP_ATOMIC);
1748 if (skb == NULL)
1749 return ERR_PTR(-ENOBUFS);
1750
1751 return skb;
1752}
1753
1754static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1755{
1756 struct sadb_msg *hdr;
1757 struct sadb_address *addr;
1758 struct sadb_lifetime *lifetime;
1759 struct sadb_x_policy *pol;
1760 struct sockaddr_in *sin;
1761#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1762 struct sockaddr_in6 *sin6;
1763#endif
1764 int i;
1765 int size;
1766 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1767 int socklen = (xp->family == AF_INET ?
1768 sizeof(struct sockaddr_in) :
1769 sizeof(struct sockaddr_in6));
1770
1771 size = pfkey_xfrm_policy2msg_size(xp);
1772
1773 /* call should fill header later */
1774 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1775 memset(hdr, 0, size); /* XXX do we need this ? */
1776
1777 /* src address */
1778 addr = (struct sadb_address*) skb_put(skb,
1779 sizeof(struct sadb_address)+sockaddr_size);
1780 addr->sadb_address_len =
1781 (sizeof(struct sadb_address)+sockaddr_size)/
1782 sizeof(uint64_t);
1783 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1784 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1785 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1786 addr->sadb_address_reserved = 0;
1787 /* src address */
1788 if (xp->family == AF_INET) {
1789 sin = (struct sockaddr_in *) (addr + 1);
1790 sin->sin_family = AF_INET;
1791 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1792 sin->sin_port = xp->selector.sport;
1793 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1794 }
1795#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1796 else if (xp->family == AF_INET6) {
1797 sin6 = (struct sockaddr_in6 *) (addr + 1);
1798 sin6->sin6_family = AF_INET6;
1799 sin6->sin6_port = xp->selector.sport;
1800 sin6->sin6_flowinfo = 0;
1801 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1802 sizeof(struct in6_addr));
1803 sin6->sin6_scope_id = 0;
1804 }
1805#endif
1806 else
1807 BUG();
1808
1809 /* dst address */
1810 addr = (struct sadb_address*) skb_put(skb,
1811 sizeof(struct sadb_address)+sockaddr_size);
1812 addr->sadb_address_len =
1813 (sizeof(struct sadb_address)+sockaddr_size)/
1814 sizeof(uint64_t);
1815 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1816 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1817 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1818 addr->sadb_address_reserved = 0;
1819 if (xp->family == AF_INET) {
1820 sin = (struct sockaddr_in *) (addr + 1);
1821 sin->sin_family = AF_INET;
1822 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1823 sin->sin_port = xp->selector.dport;
1824 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1825 }
1826#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1827 else if (xp->family == AF_INET6) {
1828 sin6 = (struct sockaddr_in6 *) (addr + 1);
1829 sin6->sin6_family = AF_INET6;
1830 sin6->sin6_port = xp->selector.dport;
1831 sin6->sin6_flowinfo = 0;
1832 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1833 sizeof(struct in6_addr));
1834 sin6->sin6_scope_id = 0;
1835 }
1836#endif
1837 else
1838 BUG();
1839
1840 /* hard time */
1841 lifetime = (struct sadb_lifetime *) skb_put(skb,
1842 sizeof(struct sadb_lifetime));
1843 lifetime->sadb_lifetime_len =
1844 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1845 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1846 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
1847 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1848 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1849 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1850 /* soft time */
1851 lifetime = (struct sadb_lifetime *) skb_put(skb,
1852 sizeof(struct sadb_lifetime));
1853 lifetime->sadb_lifetime_len =
1854 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1855 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1856 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
1857 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1858 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1859 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1860 /* current time */
1861 lifetime = (struct sadb_lifetime *) skb_put(skb,
1862 sizeof(struct sadb_lifetime));
1863 lifetime->sadb_lifetime_len =
1864 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1865 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1866 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1867 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1868 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1869 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1870
1871 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
1872 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1873 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1874 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1875 if (xp->action == XFRM_POLICY_ALLOW) {
1876 if (xp->xfrm_nr)
1877 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1878 else
1879 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1880 }
1881 pol->sadb_x_policy_dir = dir+1;
1882 pol->sadb_x_policy_id = xp->index;
1883 pol->sadb_x_policy_priority = xp->priority;
1884
1885 for (i=0; i<xp->xfrm_nr; i++) {
1886 struct sadb_x_ipsecrequest *rq;
1887 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1888 int req_size;
1889
1890 req_size = sizeof(struct sadb_x_ipsecrequest);
1891 if (t->mode)
1892 req_size += 2*socklen;
1893 else
1894 size -= 2*socklen;
1895 rq = (void*)skb_put(skb, req_size);
1896 pol->sadb_x_policy_len += req_size/8;
1897 memset(rq, 0, sizeof(*rq));
1898 rq->sadb_x_ipsecrequest_len = req_size;
1899 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1900 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1901 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1902 if (t->reqid)
1903 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1904 if (t->optional)
1905 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1906 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1907 if (t->mode) {
1908 switch (xp->family) {
1909 case AF_INET:
1910 sin = (void*)(rq+1);
1911 sin->sin_family = AF_INET;
1912 sin->sin_addr.s_addr = t->saddr.a4;
1913 sin->sin_port = 0;
1914 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1915 sin++;
1916 sin->sin_family = AF_INET;
1917 sin->sin_addr.s_addr = t->id.daddr.a4;
1918 sin->sin_port = 0;
1919 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1920 break;
1921#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1922 case AF_INET6:
1923 sin6 = (void*)(rq+1);
1924 sin6->sin6_family = AF_INET6;
1925 sin6->sin6_port = 0;
1926 sin6->sin6_flowinfo = 0;
1927 memcpy(&sin6->sin6_addr, t->saddr.a6,
1928 sizeof(struct in6_addr));
1929 sin6->sin6_scope_id = 0;
1930
1931 sin6++;
1932 sin6->sin6_family = AF_INET6;
1933 sin6->sin6_port = 0;
1934 sin6->sin6_flowinfo = 0;
1935 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1936 sizeof(struct in6_addr));
1937 sin6->sin6_scope_id = 0;
1938 break;
1939#endif
1940 default:
1941 break;
1942 }
1943 }
1944 }
1945 hdr->sadb_msg_len = size / sizeof(uint64_t);
1946 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1947}
1948
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1949static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1950{
1951 struct sk_buff *out_skb;
1952 struct sadb_msg *out_hdr;
1953 int err;
1954
1955 out_skb = pfkey_xfrm_policy2msg_prep(xp);
1956 if (IS_ERR(out_skb)) {
1957 err = PTR_ERR(out_skb);
1958 goto out;
1959 }
1960 pfkey_xfrm_policy2msg(out_skb, xp, dir);
1961
1962 out_hdr = (struct sadb_msg *) out_skb->data;
1963 out_hdr->sadb_msg_version = PF_KEY_V2;
1964
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]1965 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1966 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
1967 else
1968 out_hdr->sadb_msg_type = event2poltype(c->event);
1969 out_hdr->sadb_msg_errno = 0;
1970 out_hdr->sadb_msg_seq = c->seq;
1971 out_hdr->sadb_msg_pid = c->pid;
1972 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1973out:
1974 return 0;
1975
1976}
1977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1978static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1979{
1980 int err;
1981 struct sadb_lifetime *lifetime;
1982 struct sadb_address *sa;
1983 struct sadb_x_policy *pol;
1984 struct xfrm_policy *xp;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1985 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1986
1987 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1988 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1989 !ext_hdrs[SADB_X_EXT_POLICY-1])
1990 return -EINVAL;
1991
1992 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1993 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1994 return -EINVAL;
1995 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1996 return -EINVAL;
1997
1998 xp = xfrm_policy_alloc(GFP_KERNEL);
1999 if (xp == NULL)
2000 return -ENOBUFS;
2001
2002 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2003 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2004 xp->priority = pol->sadb_x_policy_priority;
2005
2006 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2007 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2008 if (!xp->family) {
2009 err = -EINVAL;
2010 goto out;
2011 }
2012 xp->selector.family = xp->family;
2013 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2014 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2015 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2016 if (xp->selector.sport)
2017 xp->selector.sport_mask = ~0;
2018
2019 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2020 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2021 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2022
2023 /* Amusing, we set this twice. KAME apps appear to set same value
2024 * in both addresses.
2025 */
2026 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2027
2028 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2029 if (xp->selector.dport)
2030 xp->selector.dport_mask = ~0;
2031
2032 xp->lft.soft_byte_limit = XFRM_INF;
2033 xp->lft.hard_byte_limit = XFRM_INF;
2034 xp->lft.soft_packet_limit = XFRM_INF;
2035 xp->lft.hard_packet_limit = XFRM_INF;
2036 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2037 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2038 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2039 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2040 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2041 }
2042 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2043 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2044 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2045 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2046 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2047 }
2048 xp->xfrm_nr = 0;
2049 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2050 (err = parse_ipsecrequests(xp, pol)) < 0)
2051 goto out;
2052
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2053 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2054 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2055 if (err) {
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2056 kfree(xp);
2057 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2058 }
2059
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2060 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2061 c.event = XFRM_MSG_UPDPOLICY;
2062 else
2063 c.event = XFRM_MSG_NEWPOLICY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2064
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2065 c.seq = hdr->sadb_msg_seq;
2066 c.pid = hdr->sadb_msg_pid;
2067
2068 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2069 xfrm_pol_put(xp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2070 return 0;
2071
2072out:
2073 kfree(xp);
2074 return err;
2075}
2076
2077static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2078{
2079 int err;
2080 struct sadb_address *sa;
2081 struct sadb_x_policy *pol;
2082 struct xfrm_policy *xp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2083 struct xfrm_selector sel;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2084 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2085
2086 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2087 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2088 !ext_hdrs[SADB_X_EXT_POLICY-1])
2089 return -EINVAL;
2090
2091 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2092 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2093 return -EINVAL;
2094
2095 memset(&sel, 0, sizeof(sel));
2096
2097 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2098 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2099 sel.prefixlen_s = sa->sadb_address_prefixlen;
2100 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2101 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2102 if (sel.sport)
2103 sel.sport_mask = ~0;
2104
2105 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2106 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2107 sel.prefixlen_d = sa->sadb_address_prefixlen;
2108 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2109 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2110 if (sel.dport)
2111 sel.dport_mask = ~0;
2112
2113 xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2114 if (xp == NULL)
2115 return -ENOENT;
2116
2117 err = 0;
2118
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2119 c.seq = hdr->sadb_msg_seq;
2120 c.pid = hdr->sadb_msg_pid;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2121 c.event = XFRM_MSG_DELPOLICY;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2122 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2123
2124 xfrm_pol_put(xp);
2125 return err;
2126}
2127
2128static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2129{
2130 int err;
2131 struct sk_buff *out_skb;
2132 struct sadb_msg *out_hdr;
2133 err = 0;
2134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2135 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2136 if (IS_ERR(out_skb)) {
2137 err = PTR_ERR(out_skb);
2138 goto out;
2139 }
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2140 pfkey_xfrm_policy2msg(out_skb, xp, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2141
2142 out_hdr = (struct sadb_msg *) out_skb->data;
2143 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2144 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2145 out_hdr->sadb_msg_satype = 0;
2146 out_hdr->sadb_msg_errno = 0;
2147 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2148 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2149 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2150 err = 0;
2151
2152out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2153 return err;
2154}
2155
2156static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2157{
2158 int err;
2159 struct sadb_x_policy *pol;
2160 struct xfrm_policy *xp;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2161 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2162
2163 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2164 return -EINVAL;
2165
2166 xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2167 hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2168 if (xp == NULL)
2169 return -ENOENT;
2170
2171 err = 0;
2172
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2173 c.seq = hdr->sadb_msg_seq;
2174 c.pid = hdr->sadb_msg_pid;
2175 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
Herbert Xubf088672005-06-18 22:44:00 -0700[diff] [blame]2176 c.data.byid = 1;
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2177 c.event = XFRM_MSG_DELPOLICY;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2178 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2179 } else {
2180 err = key_pol_get_resp(sk, xp, hdr, pol->sadb_x_policy_dir-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2183 xfrm_pol_put(xp);
2184 return err;
2185}
2186
2187static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2188{
2189 struct pfkey_dump_data *data = ptr;
2190 struct sk_buff *out_skb;
2191 struct sadb_msg *out_hdr;
2192
2193 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2194 if (IS_ERR(out_skb))
2195 return PTR_ERR(out_skb);
2196
2197 pfkey_xfrm_policy2msg(out_skb, xp, dir);
2198
2199 out_hdr = (struct sadb_msg *) out_skb->data;
2200 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2201 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2202 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2203 out_hdr->sadb_msg_errno = 0;
2204 out_hdr->sadb_msg_seq = count;
2205 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2206 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2207 return 0;
2208}
2209
2210static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2211{
2212 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2213
2214 return xfrm_policy_walk(dump_sp, &data);
2215}
2216
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2217static int key_notify_policy_flush(struct km_event *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2218{
2219 struct sk_buff *skb_out;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2220 struct sadb_msg *hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2221
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2222 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2223 if (!skb_out)
2224 return -ENOBUFS;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2225 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2226 hdr->sadb_msg_seq = c->seq;
2227 hdr->sadb_msg_pid = c->pid;
2228 hdr->sadb_msg_version = PF_KEY_V2;
2229 hdr->sadb_msg_errno = (uint8_t) 0;
2230 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2231 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2232 return 0;
2233
2234}
2235
2236static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2237{
2238 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2239
2240 xfrm_policy_flush();
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2241 c.event = XFRM_MSG_FLUSHPOLICY;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2242 c.pid = hdr->sadb_msg_pid;
2243 c.seq = hdr->sadb_msg_seq;
2244 km_policy_notify(NULL, 0, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2245
2246 return 0;
2247}
2248
2249typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2250 struct sadb_msg *hdr, void **ext_hdrs);
2251static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2252 [SADB_RESERVED] = pfkey_reserved,
2253 [SADB_GETSPI] = pfkey_getspi,
2254 [SADB_UPDATE] = pfkey_add,
2255 [SADB_ADD] = pfkey_add,
2256 [SADB_DELETE] = pfkey_delete,
2257 [SADB_GET] = pfkey_get,
2258 [SADB_ACQUIRE] = pfkey_acquire,
2259 [SADB_REGISTER] = pfkey_register,
2260 [SADB_EXPIRE] = NULL,
2261 [SADB_FLUSH] = pfkey_flush,
2262 [SADB_DUMP] = pfkey_dump,
2263 [SADB_X_PROMISC] = pfkey_promisc,
2264 [SADB_X_PCHANGE] = NULL,
2265 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2266 [SADB_X_SPDADD] = pfkey_spdadd,
2267 [SADB_X_SPDDELETE] = pfkey_spddelete,
2268 [SADB_X_SPDGET] = pfkey_spdget,
2269 [SADB_X_SPDACQUIRE] = NULL,
2270 [SADB_X_SPDDUMP] = pfkey_spddump,
2271 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2272 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2273 [SADB_X_SPDDELETE2] = pfkey_spdget,
2274};
2275
2276static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2277{
2278 void *ext_hdrs[SADB_EXT_MAX];
2279 int err;
2280
2281 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2282 BROADCAST_PROMISC_ONLY, NULL);
2283
2284 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2285 err = parse_exthdrs(skb, hdr, ext_hdrs);
2286 if (!err) {
2287 err = -EOPNOTSUPP;
2288 if (pfkey_funcs[hdr->sadb_msg_type])
2289 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2290 }
2291 return err;
2292}
2293
2294static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2295{
2296 struct sadb_msg *hdr = NULL;
2297
2298 if (skb->len < sizeof(*hdr)) {
2299 *errp = -EMSGSIZE;
2300 } else {
2301 hdr = (struct sadb_msg *) skb->data;
2302 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2303 hdr->sadb_msg_reserved != 0 ||
2304 (hdr->sadb_msg_type <= SADB_RESERVED ||
2305 hdr->sadb_msg_type > SADB_MAX)) {
2306 hdr = NULL;
2307 *errp = -EINVAL;
2308 } else if (hdr->sadb_msg_len != (skb->len /
2309 sizeof(uint64_t)) ||
2310 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2311 sizeof(uint64_t))) {
2312 hdr = NULL;
2313 *errp = -EMSGSIZE;
2314 } else {
2315 *errp = 0;
2316 }
2317 }
2318 return hdr;
2319}
2320
2321static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2322{
2323 return t->aalgos & (1 << d->desc.sadb_alg_id);
2324}
2325
2326static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2327{
2328 return t->ealgos & (1 << d->desc.sadb_alg_id);
2329}
2330
2331static int count_ah_combs(struct xfrm_tmpl *t)
2332{
2333 int i, sz = 0;
2334
2335 for (i = 0; ; i++) {
2336 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2337 if (!aalg)
2338 break;
2339 if (aalg_tmpl_set(t, aalg) && aalg->available)
2340 sz += sizeof(struct sadb_comb);
2341 }
2342 return sz + sizeof(struct sadb_prop);
2343}
2344
2345static int count_esp_combs(struct xfrm_tmpl *t)
2346{
2347 int i, k, sz = 0;
2348
2349 for (i = 0; ; i++) {
2350 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2351 if (!ealg)
2352 break;
2353
2354 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2355 continue;
2356
2357 for (k = 1; ; k++) {
2358 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2359 if (!aalg)
2360 break;
2361
2362 if (aalg_tmpl_set(t, aalg) && aalg->available)
2363 sz += sizeof(struct sadb_comb);
2364 }
2365 }
2366 return sz + sizeof(struct sadb_prop);
2367}
2368
2369static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2370{
2371 struct sadb_prop *p;
2372 int i;
2373
2374 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2375 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2376 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2377 p->sadb_prop_replay = 32;
2378 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2379
2380 for (i = 0; ; i++) {
2381 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2382 if (!aalg)
2383 break;
2384
2385 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2386 struct sadb_comb *c;
2387 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2388 memset(c, 0, sizeof(*c));
2389 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2390 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2391 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2392 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2393 c->sadb_comb_hard_addtime = 24*60*60;
2394 c->sadb_comb_soft_addtime = 20*60*60;
2395 c->sadb_comb_hard_usetime = 8*60*60;
2396 c->sadb_comb_soft_usetime = 7*60*60;
2397 }
2398 }
2399}
2400
2401static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2402{
2403 struct sadb_prop *p;
2404 int i, k;
2405
2406 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2407 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2408 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2409 p->sadb_prop_replay = 32;
2410 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2411
2412 for (i=0; ; i++) {
2413 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2414 if (!ealg)
2415 break;
2416
2417 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2418 continue;
2419
2420 for (k = 1; ; k++) {
2421 struct sadb_comb *c;
2422 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2423 if (!aalg)
2424 break;
2425 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2426 continue;
2427 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2428 memset(c, 0, sizeof(*c));
2429 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2430 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2431 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2432 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2433 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2434 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2435 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2436 c->sadb_comb_hard_addtime = 24*60*60;
2437 c->sadb_comb_soft_addtime = 20*60*60;
2438 c->sadb_comb_hard_usetime = 8*60*60;
2439 c->sadb_comb_soft_usetime = 7*60*60;
2440 }
2441 }
2442}
2443
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2444static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2445{
2446 return 0;
2447}
2448
2449static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2450{
2451 struct sk_buff *out_skb;
2452 struct sadb_msg *out_hdr;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2453 int hard;
2454 int hsc;
2455
Herbert Xubf088672005-06-18 22:44:00 -0700[diff] [blame]2456 hard = c->data.hard;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2457 if (hard)
2458 hsc = 2;
2459 else
2460 hsc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2461
2462 out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2463 if (IS_ERR(out_skb))
2464 return PTR_ERR(out_skb);
2465
2466 out_hdr = (struct sadb_msg *) out_skb->data;
2467 out_hdr->sadb_msg_version = PF_KEY_V2;
2468 out_hdr->sadb_msg_type = SADB_EXPIRE;
2469 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2470 out_hdr->sadb_msg_errno = 0;
2471 out_hdr->sadb_msg_reserved = 0;
2472 out_hdr->sadb_msg_seq = 0;
2473 out_hdr->sadb_msg_pid = 0;
2474
2475 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2476 return 0;
2477}
2478
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2479static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2480{
2481 switch (c->event) {
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2482 case XFRM_MSG_EXPIRE:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2483 return key_notify_sa_expire(x, c);
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2484 case XFRM_MSG_DELSA:
2485 case XFRM_MSG_NEWSA:
2486 case XFRM_MSG_UPDSA:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2487 return key_notify_sa(x, c);
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2488 case XFRM_MSG_FLUSHSA:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2489 return key_notify_sa_flush(c);
2490 default:
2491 printk("pfkey: Unknown SA event %d\n", c->event);
2492 break;
2493 }
2494
2495 return 0;
2496}
2497
2498static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2499{
2500 switch (c->event) {
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2501 case XFRM_MSG_POLEXPIRE:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2502 return key_notify_policy_expire(xp, c);
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2503 case XFRM_MSG_DELPOLICY:
2504 case XFRM_MSG_NEWPOLICY:
2505 case XFRM_MSG_UPDPOLICY:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2506 return key_notify_policy(xp, dir, c);
Herbert Xuf60f6b82005-06-18 22:44:37 -0700[diff] [blame^]2507 case XFRM_MSG_FLUSHPOLICY:
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2508 return key_notify_policy_flush(c);
2509 default:
2510 printk("pfkey: Unknown policy event %d\n", c->event);
2511 break;
2512 }
2513
2514 return 0;
2515}
2516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2517static u32 get_acqseq(void)
2518{
2519 u32 res;
2520 static u32 acqseq;
2521 static DEFINE_SPINLOCK(acqseq_lock);
2522
2523 spin_lock_bh(&acqseq_lock);
2524 res = (++acqseq ? : ++acqseq);
2525 spin_unlock_bh(&acqseq_lock);
2526 return res;
2527}
2528
2529static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2530{
2531 struct sk_buff *skb;
2532 struct sadb_msg *hdr;
2533 struct sadb_address *addr;
2534 struct sadb_x_policy *pol;
2535 struct sockaddr_in *sin;
2536#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2537 struct sockaddr_in6 *sin6;
2538#endif
2539 int sockaddr_size;
2540 int size;
2541
2542 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2543 if (!sockaddr_size)
2544 return -EINVAL;
2545
2546 size = sizeof(struct sadb_msg) +
2547 (sizeof(struct sadb_address) * 2) +
2548 (sockaddr_size * 2) +
2549 sizeof(struct sadb_x_policy);
2550
2551 if (x->id.proto == IPPROTO_AH)
2552 size += count_ah_combs(t);
2553 else if (x->id.proto == IPPROTO_ESP)
2554 size += count_esp_combs(t);
2555
2556 skb = alloc_skb(size + 16, GFP_ATOMIC);
2557 if (skb == NULL)
2558 return -ENOMEM;
2559
2560 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2561 hdr->sadb_msg_version = PF_KEY_V2;
2562 hdr->sadb_msg_type = SADB_ACQUIRE;
2563 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2564 hdr->sadb_msg_len = size / sizeof(uint64_t);
2565 hdr->sadb_msg_errno = 0;
2566 hdr->sadb_msg_reserved = 0;
2567 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2568 hdr->sadb_msg_pid = 0;
2569
2570 /* src address */
2571 addr = (struct sadb_address*) skb_put(skb,
2572 sizeof(struct sadb_address)+sockaddr_size);
2573 addr->sadb_address_len =
2574 (sizeof(struct sadb_address)+sockaddr_size)/
2575 sizeof(uint64_t);
2576 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2577 addr->sadb_address_proto = 0;
2578 addr->sadb_address_reserved = 0;
2579 if (x->props.family == AF_INET) {
2580 addr->sadb_address_prefixlen = 32;
2581
2582 sin = (struct sockaddr_in *) (addr + 1);
2583 sin->sin_family = AF_INET;
2584 sin->sin_addr.s_addr = x->props.saddr.a4;
2585 sin->sin_port = 0;
2586 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2587 }
2588#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2589 else if (x->props.family == AF_INET6) {
2590 addr->sadb_address_prefixlen = 128;
2591
2592 sin6 = (struct sockaddr_in6 *) (addr + 1);
2593 sin6->sin6_family = AF_INET6;
2594 sin6->sin6_port = 0;
2595 sin6->sin6_flowinfo = 0;
2596 memcpy(&sin6->sin6_addr,
2597 x->props.saddr.a6, sizeof(struct in6_addr));
2598 sin6->sin6_scope_id = 0;
2599 }
2600#endif
2601 else
2602 BUG();
2603
2604 /* dst address */
2605 addr = (struct sadb_address*) skb_put(skb,
2606 sizeof(struct sadb_address)+sockaddr_size);
2607 addr->sadb_address_len =
2608 (sizeof(struct sadb_address)+sockaddr_size)/
2609 sizeof(uint64_t);
2610 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2611 addr->sadb_address_proto = 0;
2612 addr->sadb_address_reserved = 0;
2613 if (x->props.family == AF_INET) {
2614 addr->sadb_address_prefixlen = 32;
2615
2616 sin = (struct sockaddr_in *) (addr + 1);
2617 sin->sin_family = AF_INET;
2618 sin->sin_addr.s_addr = x->id.daddr.a4;
2619 sin->sin_port = 0;
2620 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2621 }
2622#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2623 else if (x->props.family == AF_INET6) {
2624 addr->sadb_address_prefixlen = 128;
2625
2626 sin6 = (struct sockaddr_in6 *) (addr + 1);
2627 sin6->sin6_family = AF_INET6;
2628 sin6->sin6_port = 0;
2629 sin6->sin6_flowinfo = 0;
2630 memcpy(&sin6->sin6_addr,
2631 x->id.daddr.a6, sizeof(struct in6_addr));
2632 sin6->sin6_scope_id = 0;
2633 }
2634#endif
2635 else
2636 BUG();
2637
2638 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2639 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2640 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2641 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2642 pol->sadb_x_policy_dir = dir+1;
2643 pol->sadb_x_policy_id = xp->index;
2644
2645 /* Set sadb_comb's. */
2646 if (x->id.proto == IPPROTO_AH)
2647 dump_ah_combs(skb, t);
2648 else if (x->id.proto == IPPROTO_ESP)
2649 dump_esp_combs(skb, t);
2650
2651 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2652}
2653
2654static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2655 u8 *data, int len, int *dir)
2656{
2657 struct xfrm_policy *xp;
2658 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2659
2660 switch (family) {
2661 case AF_INET:
2662 if (opt != IP_IPSEC_POLICY) {
2663 *dir = -EOPNOTSUPP;
2664 return NULL;
2665 }
2666 break;
2667#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2668 case AF_INET6:
2669 if (opt != IPV6_IPSEC_POLICY) {
2670 *dir = -EOPNOTSUPP;
2671 return NULL;
2672 }
2673 break;
2674#endif
2675 default:
2676 *dir = -EINVAL;
2677 return NULL;
2678 }
2679
2680 *dir = -EINVAL;
2681
2682 if (len < sizeof(struct sadb_x_policy) ||
2683 pol->sadb_x_policy_len*8 > len ||
2684 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2685 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2686 return NULL;
2687
2688 xp = xfrm_policy_alloc(GFP_ATOMIC);
2689 if (xp == NULL) {
2690 *dir = -ENOBUFS;
2691 return NULL;
2692 }
2693
2694 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2695 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2696
2697 xp->lft.soft_byte_limit = XFRM_INF;
2698 xp->lft.hard_byte_limit = XFRM_INF;
2699 xp->lft.soft_packet_limit = XFRM_INF;
2700 xp->lft.hard_packet_limit = XFRM_INF;
2701 xp->family = family;
2702
2703 xp->xfrm_nr = 0;
2704 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2705 (*dir = parse_ipsecrequests(xp, pol)) < 0)
2706 goto out;
2707
2708 *dir = pol->sadb_x_policy_dir-1;
2709 return xp;
2710
2711out:
2712 kfree(xp);
2713 return NULL;
2714}
2715
2716static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2717{
2718 struct sk_buff *skb;
2719 struct sadb_msg *hdr;
2720 struct sadb_sa *sa;
2721 struct sadb_address *addr;
2722 struct sadb_x_nat_t_port *n_port;
2723 struct sockaddr_in *sin;
2724#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2725 struct sockaddr_in6 *sin6;
2726#endif
2727 int sockaddr_size;
2728 int size;
2729 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2730 struct xfrm_encap_tmpl *natt = NULL;
2731
2732 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2733 if (!sockaddr_size)
2734 return -EINVAL;
2735
2736 if (!satype)
2737 return -EINVAL;
2738
2739 if (!x->encap)
2740 return -EINVAL;
2741
2742 natt = x->encap;
2743
2744 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2745 *
2746 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2747 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2748 */
2749
2750 size = sizeof(struct sadb_msg) +
2751 sizeof(struct sadb_sa) +
2752 (sizeof(struct sadb_address) * 2) +
2753 (sockaddr_size * 2) +
2754 (sizeof(struct sadb_x_nat_t_port) * 2);
2755
2756 skb = alloc_skb(size + 16, GFP_ATOMIC);
2757 if (skb == NULL)
2758 return -ENOMEM;
2759
2760 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2761 hdr->sadb_msg_version = PF_KEY_V2;
2762 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2763 hdr->sadb_msg_satype = satype;
2764 hdr->sadb_msg_len = size / sizeof(uint64_t);
2765 hdr->sadb_msg_errno = 0;
2766 hdr->sadb_msg_reserved = 0;
2767 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2768 hdr->sadb_msg_pid = 0;
2769
2770 /* SA */
2771 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2772 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2773 sa->sadb_sa_exttype = SADB_EXT_SA;
2774 sa->sadb_sa_spi = x->id.spi;
2775 sa->sadb_sa_replay = 0;
2776 sa->sadb_sa_state = 0;
2777 sa->sadb_sa_auth = 0;
2778 sa->sadb_sa_encrypt = 0;
2779 sa->sadb_sa_flags = 0;
2780
2781 /* ADDRESS_SRC (old addr) */
2782 addr = (struct sadb_address*)
2783 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2784 addr->sadb_address_len =
2785 (sizeof(struct sadb_address)+sockaddr_size)/
2786 sizeof(uint64_t);
2787 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2788 addr->sadb_address_proto = 0;
2789 addr->sadb_address_reserved = 0;
2790 if (x->props.family == AF_INET) {
2791 addr->sadb_address_prefixlen = 32;
2792
2793 sin = (struct sockaddr_in *) (addr + 1);
2794 sin->sin_family = AF_INET;
2795 sin->sin_addr.s_addr = x->props.saddr.a4;
2796 sin->sin_port = 0;
2797 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2798 }
2799#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2800 else if (x->props.family == AF_INET6) {
2801 addr->sadb_address_prefixlen = 128;
2802
2803 sin6 = (struct sockaddr_in6 *) (addr + 1);
2804 sin6->sin6_family = AF_INET6;
2805 sin6->sin6_port = 0;
2806 sin6->sin6_flowinfo = 0;
2807 memcpy(&sin6->sin6_addr,
2808 x->props.saddr.a6, sizeof(struct in6_addr));
2809 sin6->sin6_scope_id = 0;
2810 }
2811#endif
2812 else
2813 BUG();
2814
2815 /* NAT_T_SPORT (old port) */
2816 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2817 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2818 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2819 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2820 n_port->sadb_x_nat_t_port_reserved = 0;
2821
2822 /* ADDRESS_DST (new addr) */
2823 addr = (struct sadb_address*)
2824 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2825 addr->sadb_address_len =
2826 (sizeof(struct sadb_address)+sockaddr_size)/
2827 sizeof(uint64_t);
2828 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2829 addr->sadb_address_proto = 0;
2830 addr->sadb_address_reserved = 0;
2831 if (x->props.family == AF_INET) {
2832 addr->sadb_address_prefixlen = 32;
2833
2834 sin = (struct sockaddr_in *) (addr + 1);
2835 sin->sin_family = AF_INET;
2836 sin->sin_addr.s_addr = ipaddr->a4;
2837 sin->sin_port = 0;
2838 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2839 }
2840#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2841 else if (x->props.family == AF_INET6) {
2842 addr->sadb_address_prefixlen = 128;
2843
2844 sin6 = (struct sockaddr_in6 *) (addr + 1);
2845 sin6->sin6_family = AF_INET6;
2846 sin6->sin6_port = 0;
2847 sin6->sin6_flowinfo = 0;
2848 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2849 sin6->sin6_scope_id = 0;
2850 }
2851#endif
2852 else
2853 BUG();
2854
2855 /* NAT_T_DPORT (new port) */
2856 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2857 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2858 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2859 n_port->sadb_x_nat_t_port_port = sport;
2860 n_port->sadb_x_nat_t_port_reserved = 0;
2861
2862 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2863}
2864
2865static int pfkey_sendmsg(struct kiocb *kiocb,
2866 struct socket *sock, struct msghdr *msg, size_t len)
2867{
2868 struct sock *sk = sock->sk;
2869 struct sk_buff *skb = NULL;
2870 struct sadb_msg *hdr = NULL;
2871 int err;
2872
2873 err = -EOPNOTSUPP;
2874 if (msg->msg_flags & MSG_OOB)
2875 goto out;
2876
2877 err = -EMSGSIZE;
2878 if ((unsigned)len > sk->sk_sndbuf - 32)
2879 goto out;
2880
2881 err = -ENOBUFS;
2882 skb = alloc_skb(len, GFP_KERNEL);
2883 if (skb == NULL)
2884 goto out;
2885
2886 err = -EFAULT;
2887 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2888 goto out;
2889
2890 hdr = pfkey_get_base_msg(skb, &err);
2891 if (!hdr)
2892 goto out;
2893
2894 down(&xfrm_cfg_sem);
2895 err = pfkey_process(sk, skb, hdr);
2896 up(&xfrm_cfg_sem);
2897
2898out:
2899 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2900 err = 0;
2901 if (skb)
2902 kfree_skb(skb);
2903
2904 return err ? : len;
2905}
2906
2907static int pfkey_recvmsg(struct kiocb *kiocb,
2908 struct socket *sock, struct msghdr *msg, size_t len,
2909 int flags)
2910{
2911 struct sock *sk = sock->sk;
2912 struct sk_buff *skb;
2913 int copied, err;
2914
2915 err = -EINVAL;
2916 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2917 goto out;
2918
2919 msg->msg_namelen = 0;
2920 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2921 if (skb == NULL)
2922 goto out;
2923
2924 copied = skb->len;
2925 if (copied > len) {
2926 msg->msg_flags |= MSG_TRUNC;
2927 copied = len;
2928 }
2929
2930 skb->h.raw = skb->data;
2931 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2932 if (err)
2933 goto out_free;
2934
2935 sock_recv_timestamp(msg, sk, skb);
2936
2937 err = (flags & MSG_TRUNC) ? skb->len : copied;
2938
2939out_free:
2940 skb_free_datagram(sk, skb);
2941out:
2942 return err;
2943}
2944
2945static struct proto_ops pfkey_ops = {
2946 .family = PF_KEY,
2947 .owner = THIS_MODULE,
2948 /* Operations that make no sense on pfkey sockets. */
2949 .bind = sock_no_bind,
2950 .connect = sock_no_connect,
2951 .socketpair = sock_no_socketpair,
2952 .accept = sock_no_accept,
2953 .getname = sock_no_getname,
2954 .ioctl = sock_no_ioctl,
2955 .listen = sock_no_listen,
2956 .shutdown = sock_no_shutdown,
2957 .setsockopt = sock_no_setsockopt,
2958 .getsockopt = sock_no_getsockopt,
2959 .mmap = sock_no_mmap,
2960 .sendpage = sock_no_sendpage,
2961
2962 /* Now the operations that really occur. */
2963 .release = pfkey_release,
2964 .poll = datagram_poll,
2965 .sendmsg = pfkey_sendmsg,
2966 .recvmsg = pfkey_recvmsg,
2967};
2968
2969static struct net_proto_family pfkey_family_ops = {
2970 .family = PF_KEY,
2971 .create = pfkey_create,
2972 .owner = THIS_MODULE,
2973};
2974
2975#ifdef CONFIG_PROC_FS
2976static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2977 int length, int *eof, void *data)
2978{
2979 off_t pos = 0;
2980 off_t begin = 0;
2981 int len = 0;
2982 struct sock *s;
2983 struct hlist_node *node;
2984
2985 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n");
2986
2987 read_lock(&pfkey_table_lock);
2988
2989 sk_for_each(s, node, &pfkey_table) {
2990 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2991 s,
2992 atomic_read(&s->sk_refcnt),
2993 atomic_read(&s->sk_rmem_alloc),
2994 atomic_read(&s->sk_wmem_alloc),
2995 sock_i_uid(s),
2996 sock_i_ino(s)
2997 );
2998
2999 buffer[len++] = '\n';
3000
3001 pos = begin + len;
3002 if (pos < offset) {
3003 len = 0;
3004 begin = pos;
3005 }
3006 if(pos > offset + length)
3007 goto done;
3008 }
3009 *eof = 1;
3010
3011done:
3012 read_unlock(&pfkey_table_lock);
3013
3014 *start = buffer + (offset - begin);
3015 len -= (offset - begin);
3016
3017 if (len > length)
3018 len = length;
3019 if (len < 0)
3020 len = 0;
3021
3022 return len;
3023}
3024#endif
3025
3026static struct xfrm_mgr pfkeyv2_mgr =
3027{
3028 .id = "pfkeyv2",
3029 .notify = pfkey_send_notify,
3030 .acquire = pfkey_send_acquire,
3031 .compile_policy = pfkey_compile_policy,
3032 .new_mapping = pfkey_send_new_mapping,
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]3033 .notify_policy = pfkey_send_policy_notify,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]3034};
3035
3036static void __exit ipsec_pfkey_exit(void)
3037{
3038 xfrm_unregister_km(&pfkeyv2_mgr);
3039 remove_proc_entry("net/pfkey", NULL);
3040 sock_unregister(PF_KEY);
3041 proto_unregister(&key_proto);
3042}
3043
3044static int __init ipsec_pfkey_init(void)
3045{
3046 int err = proto_register(&key_proto, 0);
3047
3048 if (err != 0)
3049 goto out;
3050
3051 err = sock_register(&pfkey_family_ops);
3052 if (err != 0)
3053 goto out_unregister_key_proto;
3054#ifdef CONFIG_PROC_FS
3055 err = -ENOMEM;
3056 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3057 goto out_sock_unregister;
3058#endif
3059 err = xfrm_register_km(&pfkeyv2_mgr);
3060 if (err != 0)
3061 goto out_remove_proc_entry;
3062out:
3063 return err;
3064out_remove_proc_entry:
3065#ifdef CONFIG_PROC_FS
3066 remove_proc_entry("net/pfkey", NULL);
3067out_sock_unregister:
3068#endif
3069 sock_unregister(PF_KEY);
3070out_unregister_key_proto:
3071 proto_unregister(&key_proto);
3072 goto out;
3073}
3074
3075module_init(ipsec_pfkey_init);
3076module_exit(ipsec_pfkey_exit);
3077MODULE_LICENSE("GPL");
3078MODULE_ALIAS_NETPROTO(PF_KEY);