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nv-tegra.nvidia.com / linux-4.4 / 4f09f0bbc1cb3c74e8f2047ad4be201a059829ee / . / net / key / af_key.c
blob: 560c93c1089074e35b73ca12b0c6c5b97b28c556 [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) {
1251 case XFRM_SAP_DELETED:
1252 return SADB_X_SPDDELETE;
1253 case XFRM_SAP_ADDED:
1254 return SADB_X_SPDADD;
1255 case XFRM_SAP_UPDATED:
1256 return SADB_X_SPDUPDATE;
1257 case XFRM_SAP_EXPIRED:
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) {
1270 case XFRM_SAP_DELETED:
1271 return SADB_DELETE;
1272 case XFRM_SAP_ADDED:
1273 return SADB_ADD;
1274 case XFRM_SAP_UPDATED:
1275 return SADB_UPDATE;
1276 case XFRM_SAP_EXPIRED:
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
1293 if (c->event == XFRM_SAP_DELETED)
1294 hsc = 0;
1295
1296 if (c->event == XFRM_SAP_EXPIRED) {
1297 if (c->data)
1298 hsc = 2;
1299 else
1300 hsc = 1;
1301 }
1302
1303 skb = pfkey_xfrm_state2msg(x, 0, hsc);
1304
1305 if (IS_ERR(skb))
1306 return PTR_ERR(skb);
1307
1308 hdr = (struct sadb_msg *) skb->data;
1309 hdr->sadb_msg_version = PF_KEY_V2;
1310 hdr->sadb_msg_type = event2keytype(c->event);
1311 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1312 hdr->sadb_msg_errno = 0;
1313 hdr->sadb_msg_reserved = 0;
1314 hdr->sadb_msg_seq = c->seq;
1315 hdr->sadb_msg_pid = c->pid;
1316
1317 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1318
1319 return 0;
1320}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1321
1322static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1323{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1324 struct xfrm_state *x;
1325 int err;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1326 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1327
1328 xfrm_probe_algs();
1329
1330 x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1331 if (IS_ERR(x))
1332 return PTR_ERR(x);
1333
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1334 xfrm_state_hold(x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1335 if (hdr->sadb_msg_type == SADB_ADD)
1336 err = xfrm_state_add(x);
1337 else
1338 err = xfrm_state_update(x);
1339
1340 if (err < 0) {
1341 x->km.state = XFRM_STATE_DEAD;
1342 xfrm_state_put(x);
1343 return err;
1344 }
1345
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1346 if (hdr->sadb_msg_type == SADB_ADD)
1347 c.event = XFRM_SAP_ADDED;
1348 else
1349 c.event = XFRM_SAP_UPDATED;
1350 c.seq = hdr->sadb_msg_seq;
1351 c.pid = hdr->sadb_msg_pid;
1352 km_state_notify(x, &c);
1353 xfrm_state_put(x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1354
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1355 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1356}
1357
1358static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1359{
1360 struct xfrm_state *x;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1361 struct km_event c;
1362 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1363
1364 if (!ext_hdrs[SADB_EXT_SA-1] ||
1365 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1366 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1367 return -EINVAL;
1368
1369 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1370 if (x == NULL)
1371 return -ESRCH;
1372
1373 if (xfrm_state_kern(x)) {
1374 xfrm_state_put(x);
1375 return -EPERM;
1376 }
1377
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1378 err = xfrm_state_delete(x);
1379 if (err < 0) {
1380 xfrm_state_put(x);
1381 return err;
1382 }
1383
1384 c.seq = hdr->sadb_msg_seq;
1385 c.pid = hdr->sadb_msg_pid;
1386 c.event = XFRM_SAP_DELETED;
1387 km_state_notify(x, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1388 xfrm_state_put(x);
1389
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1390 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1391}
1392
1393static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1394{
1395 __u8 proto;
1396 struct sk_buff *out_skb;
1397 struct sadb_msg *out_hdr;
1398 struct xfrm_state *x;
1399
1400 if (!ext_hdrs[SADB_EXT_SA-1] ||
1401 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1402 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1403 return -EINVAL;
1404
1405 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1406 if (x == NULL)
1407 return -ESRCH;
1408
1409 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1410 proto = x->id.proto;
1411 xfrm_state_put(x);
1412 if (IS_ERR(out_skb))
1413 return PTR_ERR(out_skb);
1414
1415 out_hdr = (struct sadb_msg *) out_skb->data;
1416 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1417 out_hdr->sadb_msg_type = SADB_DUMP;
1418 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1419 out_hdr->sadb_msg_errno = 0;
1420 out_hdr->sadb_msg_reserved = 0;
1421 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1422 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1423 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1424
1425 return 0;
1426}
1427
1428static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1429{
1430 struct sk_buff *skb;
1431 struct sadb_msg *hdr;
1432 int len, auth_len, enc_len, i;
1433
1434 auth_len = xfrm_count_auth_supported();
1435 if (auth_len) {
1436 auth_len *= sizeof(struct sadb_alg);
1437 auth_len += sizeof(struct sadb_supported);
1438 }
1439
1440 enc_len = xfrm_count_enc_supported();
1441 if (enc_len) {
1442 enc_len *= sizeof(struct sadb_alg);
1443 enc_len += sizeof(struct sadb_supported);
1444 }
1445
1446 len = enc_len + auth_len + sizeof(struct sadb_msg);
1447
1448 skb = alloc_skb(len + 16, allocation);
1449 if (!skb)
1450 goto out_put_algs;
1451
1452 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1453 pfkey_hdr_dup(hdr, orig);
1454 hdr->sadb_msg_errno = 0;
1455 hdr->sadb_msg_len = len / sizeof(uint64_t);
1456
1457 if (auth_len) {
1458 struct sadb_supported *sp;
1459 struct sadb_alg *ap;
1460
1461 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1462 ap = (struct sadb_alg *) (sp + 1);
1463
1464 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1465 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1466
1467 for (i = 0; ; i++) {
1468 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1469 if (!aalg)
1470 break;
1471 if (aalg->available)
1472 *ap++ = aalg->desc;
1473 }
1474 }
1475
1476 if (enc_len) {
1477 struct sadb_supported *sp;
1478 struct sadb_alg *ap;
1479
1480 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1481 ap = (struct sadb_alg *) (sp + 1);
1482
1483 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1484 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1485
1486 for (i = 0; ; i++) {
1487 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1488 if (!ealg)
1489 break;
1490 if (ealg->available)
1491 *ap++ = ealg->desc;
1492 }
1493 }
1494
1495out_put_algs:
1496 return skb;
1497}
1498
1499static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1500{
1501 struct pfkey_sock *pfk = pfkey_sk(sk);
1502 struct sk_buff *supp_skb;
1503
1504 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1505 return -EINVAL;
1506
1507 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1508 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1509 return -EEXIST;
1510 pfk->registered |= (1<<hdr->sadb_msg_satype);
1511 }
1512
1513 xfrm_probe_algs();
1514
1515 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1516 if (!supp_skb) {
1517 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1518 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1519
1520 return -ENOBUFS;
1521 }
1522
1523 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1524
1525 return 0;
1526}
1527
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1528static int key_notify_sa_flush(struct km_event *c)
1529{
1530 struct sk_buff *skb;
1531 struct sadb_msg *hdr;
1532
1533 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1534 if (!skb)
1535 return -ENOBUFS;
1536 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1537 hdr->sadb_msg_satype = pfkey_proto2satype(c->data);
1538 hdr->sadb_msg_seq = c->seq;
1539 hdr->sadb_msg_pid = c->pid;
1540 hdr->sadb_msg_version = PF_KEY_V2;
1541 hdr->sadb_msg_errno = (uint8_t) 0;
1542 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1543
1544 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1545
1546 return 0;
1547}
1548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1549static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1550{
1551 unsigned proto;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1552 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1553
1554 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1555 if (proto == 0)
1556 return -EINVAL;
1557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1558 xfrm_state_flush(proto);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1559 c.data = proto;
1560 c.seq = hdr->sadb_msg_seq;
1561 c.pid = hdr->sadb_msg_pid;
1562 c.event = XFRM_SAP_FLUSHED;
1563 km_state_notify(NULL, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1564
1565 return 0;
1566}
1567
1568struct pfkey_dump_data
1569{
1570 struct sk_buff *skb;
1571 struct sadb_msg *hdr;
1572 struct sock *sk;
1573};
1574
1575static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1576{
1577 struct pfkey_dump_data *data = ptr;
1578 struct sk_buff *out_skb;
1579 struct sadb_msg *out_hdr;
1580
1581 out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1582 if (IS_ERR(out_skb))
1583 return PTR_ERR(out_skb);
1584
1585 out_hdr = (struct sadb_msg *) out_skb->data;
1586 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1587 out_hdr->sadb_msg_type = SADB_DUMP;
1588 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1589 out_hdr->sadb_msg_errno = 0;
1590 out_hdr->sadb_msg_reserved = 0;
1591 out_hdr->sadb_msg_seq = count;
1592 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1593 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1594 return 0;
1595}
1596
1597static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1598{
1599 u8 proto;
1600 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1601
1602 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1603 if (proto == 0)
1604 return -EINVAL;
1605
1606 return xfrm_state_walk(proto, dump_sa, &data);
1607}
1608
1609static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1610{
1611 struct pfkey_sock *pfk = pfkey_sk(sk);
1612 int satype = hdr->sadb_msg_satype;
1613
1614 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1615 /* XXX we mangle packet... */
1616 hdr->sadb_msg_errno = 0;
1617 if (satype != 0 && satype != 1)
1618 return -EINVAL;
1619 pfk->promisc = satype;
1620 }
1621 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1622 return 0;
1623}
1624
1625static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1626{
1627 int i;
1628 u32 reqid = *(u32*)ptr;
1629
1630 for (i=0; i<xp->xfrm_nr; i++) {
1631 if (xp->xfrm_vec[i].reqid == reqid)
1632 return -EEXIST;
1633 }
1634 return 0;
1635}
1636
1637static u32 gen_reqid(void)
1638{
1639 u32 start;
1640 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1641
1642 start = reqid;
1643 do {
1644 ++reqid;
1645 if (reqid == 0)
1646 reqid = IPSEC_MANUAL_REQID_MAX+1;
1647 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1648 return reqid;
1649 } while (reqid != start);
1650 return 0;
1651}
1652
1653static int
1654parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1655{
1656 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1657 struct sockaddr_in *sin;
1658#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1659 struct sockaddr_in6 *sin6;
1660#endif
1661
1662 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1663 return -ELOOP;
1664
1665 if (rq->sadb_x_ipsecrequest_mode == 0)
1666 return -EINVAL;
1667
1668 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1669 t->mode = rq->sadb_x_ipsecrequest_mode-1;
1670 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1671 t->optional = 1;
1672 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1673 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1674 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1675 t->reqid = 0;
1676 if (!t->reqid && !(t->reqid = gen_reqid()))
1677 return -ENOBUFS;
1678 }
1679
1680 /* addresses present only in tunnel mode */
1681 if (t->mode) {
1682 switch (xp->family) {
1683 case AF_INET:
1684 sin = (void*)(rq+1);
1685 if (sin->sin_family != AF_INET)
1686 return -EINVAL;
1687 t->saddr.a4 = sin->sin_addr.s_addr;
1688 sin++;
1689 if (sin->sin_family != AF_INET)
1690 return -EINVAL;
1691 t->id.daddr.a4 = sin->sin_addr.s_addr;
1692 break;
1693#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1694 case AF_INET6:
1695 sin6 = (void *)(rq+1);
1696 if (sin6->sin6_family != AF_INET6)
1697 return -EINVAL;
1698 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1699 sin6++;
1700 if (sin6->sin6_family != AF_INET6)
1701 return -EINVAL;
1702 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1703 break;
1704#endif
1705 default:
1706 return -EINVAL;
1707 }
1708 }
1709 /* No way to set this via kame pfkey */
1710 t->aalgos = t->ealgos = t->calgos = ~0;
1711 xp->xfrm_nr++;
1712 return 0;
1713}
1714
1715static int
1716parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1717{
1718 int err;
1719 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1720 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1721
1722 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1723 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1724 return err;
1725 len -= rq->sadb_x_ipsecrequest_len;
1726 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1727 }
1728 return 0;
1729}
1730
1731static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1732{
1733 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1734 int socklen = (xp->family == AF_INET ?
1735 sizeof(struct sockaddr_in) :
1736 sizeof(struct sockaddr_in6));
1737
1738 return sizeof(struct sadb_msg) +
1739 (sizeof(struct sadb_lifetime) * 3) +
1740 (sizeof(struct sadb_address) * 2) +
1741 (sockaddr_size * 2) +
1742 sizeof(struct sadb_x_policy) +
1743 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1744 (socklen * 2)));
1745}
1746
1747static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1748{
1749 struct sk_buff *skb;
1750 int size;
1751
1752 size = pfkey_xfrm_policy2msg_size(xp);
1753
1754 skb = alloc_skb(size + 16, GFP_ATOMIC);
1755 if (skb == NULL)
1756 return ERR_PTR(-ENOBUFS);
1757
1758 return skb;
1759}
1760
1761static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1762{
1763 struct sadb_msg *hdr;
1764 struct sadb_address *addr;
1765 struct sadb_lifetime *lifetime;
1766 struct sadb_x_policy *pol;
1767 struct sockaddr_in *sin;
1768#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1769 struct sockaddr_in6 *sin6;
1770#endif
1771 int i;
1772 int size;
1773 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1774 int socklen = (xp->family == AF_INET ?
1775 sizeof(struct sockaddr_in) :
1776 sizeof(struct sockaddr_in6));
1777
1778 size = pfkey_xfrm_policy2msg_size(xp);
1779
1780 /* call should fill header later */
1781 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1782 memset(hdr, 0, size); /* XXX do we need this ? */
1783
1784 /* src address */
1785 addr = (struct sadb_address*) skb_put(skb,
1786 sizeof(struct sadb_address)+sockaddr_size);
1787 addr->sadb_address_len =
1788 (sizeof(struct sadb_address)+sockaddr_size)/
1789 sizeof(uint64_t);
1790 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1791 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1792 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1793 addr->sadb_address_reserved = 0;
1794 /* src address */
1795 if (xp->family == AF_INET) {
1796 sin = (struct sockaddr_in *) (addr + 1);
1797 sin->sin_family = AF_INET;
1798 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1799 sin->sin_port = xp->selector.sport;
1800 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1801 }
1802#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1803 else if (xp->family == AF_INET6) {
1804 sin6 = (struct sockaddr_in6 *) (addr + 1);
1805 sin6->sin6_family = AF_INET6;
1806 sin6->sin6_port = xp->selector.sport;
1807 sin6->sin6_flowinfo = 0;
1808 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1809 sizeof(struct in6_addr));
1810 sin6->sin6_scope_id = 0;
1811 }
1812#endif
1813 else
1814 BUG();
1815
1816 /* dst address */
1817 addr = (struct sadb_address*) skb_put(skb,
1818 sizeof(struct sadb_address)+sockaddr_size);
1819 addr->sadb_address_len =
1820 (sizeof(struct sadb_address)+sockaddr_size)/
1821 sizeof(uint64_t);
1822 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1823 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1824 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1825 addr->sadb_address_reserved = 0;
1826 if (xp->family == AF_INET) {
1827 sin = (struct sockaddr_in *) (addr + 1);
1828 sin->sin_family = AF_INET;
1829 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1830 sin->sin_port = xp->selector.dport;
1831 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1832 }
1833#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1834 else if (xp->family == AF_INET6) {
1835 sin6 = (struct sockaddr_in6 *) (addr + 1);
1836 sin6->sin6_family = AF_INET6;
1837 sin6->sin6_port = xp->selector.dport;
1838 sin6->sin6_flowinfo = 0;
1839 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1840 sizeof(struct in6_addr));
1841 sin6->sin6_scope_id = 0;
1842 }
1843#endif
1844 else
1845 BUG();
1846
1847 /* hard time */
1848 lifetime = (struct sadb_lifetime *) skb_put(skb,
1849 sizeof(struct sadb_lifetime));
1850 lifetime->sadb_lifetime_len =
1851 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1852 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1853 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
1854 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1855 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1856 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1857 /* soft time */
1858 lifetime = (struct sadb_lifetime *) skb_put(skb,
1859 sizeof(struct sadb_lifetime));
1860 lifetime->sadb_lifetime_len =
1861 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1862 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1863 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
1864 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1865 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1866 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1867 /* current time */
1868 lifetime = (struct sadb_lifetime *) skb_put(skb,
1869 sizeof(struct sadb_lifetime));
1870 lifetime->sadb_lifetime_len =
1871 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1872 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1873 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1874 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1875 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1876 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1877
1878 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
1879 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1880 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1881 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1882 if (xp->action == XFRM_POLICY_ALLOW) {
1883 if (xp->xfrm_nr)
1884 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1885 else
1886 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1887 }
1888 pol->sadb_x_policy_dir = dir+1;
1889 pol->sadb_x_policy_id = xp->index;
1890 pol->sadb_x_policy_priority = xp->priority;
1891
1892 for (i=0; i<xp->xfrm_nr; i++) {
1893 struct sadb_x_ipsecrequest *rq;
1894 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1895 int req_size;
1896
1897 req_size = sizeof(struct sadb_x_ipsecrequest);
1898 if (t->mode)
1899 req_size += 2*socklen;
1900 else
1901 size -= 2*socklen;
1902 rq = (void*)skb_put(skb, req_size);
1903 pol->sadb_x_policy_len += req_size/8;
1904 memset(rq, 0, sizeof(*rq));
1905 rq->sadb_x_ipsecrequest_len = req_size;
1906 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1907 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1908 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1909 if (t->reqid)
1910 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1911 if (t->optional)
1912 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1913 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1914 if (t->mode) {
1915 switch (xp->family) {
1916 case AF_INET:
1917 sin = (void*)(rq+1);
1918 sin->sin_family = AF_INET;
1919 sin->sin_addr.s_addr = t->saddr.a4;
1920 sin->sin_port = 0;
1921 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1922 sin++;
1923 sin->sin_family = AF_INET;
1924 sin->sin_addr.s_addr = t->id.daddr.a4;
1925 sin->sin_port = 0;
1926 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1927 break;
1928#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1929 case AF_INET6:
1930 sin6 = (void*)(rq+1);
1931 sin6->sin6_family = AF_INET6;
1932 sin6->sin6_port = 0;
1933 sin6->sin6_flowinfo = 0;
1934 memcpy(&sin6->sin6_addr, t->saddr.a6,
1935 sizeof(struct in6_addr));
1936 sin6->sin6_scope_id = 0;
1937
1938 sin6++;
1939 sin6->sin6_family = AF_INET6;
1940 sin6->sin6_port = 0;
1941 sin6->sin6_flowinfo = 0;
1942 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1943 sizeof(struct in6_addr));
1944 sin6->sin6_scope_id = 0;
1945 break;
1946#endif
1947 default:
1948 break;
1949 }
1950 }
1951 }
1952 hdr->sadb_msg_len = size / sizeof(uint64_t);
1953 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1954}
1955
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1956static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1957{
1958 struct sk_buff *out_skb;
1959 struct sadb_msg *out_hdr;
1960 int err;
1961
1962 out_skb = pfkey_xfrm_policy2msg_prep(xp);
1963 if (IS_ERR(out_skb)) {
1964 err = PTR_ERR(out_skb);
1965 goto out;
1966 }
1967 pfkey_xfrm_policy2msg(out_skb, xp, dir);
1968
1969 out_hdr = (struct sadb_msg *) out_skb->data;
1970 out_hdr->sadb_msg_version = PF_KEY_V2;
1971
1972 if (c->data && c->event == XFRM_SAP_DELETED)
1973 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
1974 else
1975 out_hdr->sadb_msg_type = event2poltype(c->event);
1976 out_hdr->sadb_msg_errno = 0;
1977 out_hdr->sadb_msg_seq = c->seq;
1978 out_hdr->sadb_msg_pid = c->pid;
1979 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1980out:
1981 return 0;
1982
1983}
1984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1985static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1986{
1987 int err;
1988 struct sadb_lifetime *lifetime;
1989 struct sadb_address *sa;
1990 struct sadb_x_policy *pol;
1991 struct xfrm_policy *xp;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]1992 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1993
1994 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1995 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1996 !ext_hdrs[SADB_X_EXT_POLICY-1])
1997 return -EINVAL;
1998
1999 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2000 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2001 return -EINVAL;
2002 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2003 return -EINVAL;
2004
2005 xp = xfrm_policy_alloc(GFP_KERNEL);
2006 if (xp == NULL)
2007 return -ENOBUFS;
2008
2009 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2010 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2011 xp->priority = pol->sadb_x_policy_priority;
2012
2013 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2014 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2015 if (!xp->family) {
2016 err = -EINVAL;
2017 goto out;
2018 }
2019 xp->selector.family = xp->family;
2020 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2021 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2022 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2023 if (xp->selector.sport)
2024 xp->selector.sport_mask = ~0;
2025
2026 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2027 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2028 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2029
2030 /* Amusing, we set this twice. KAME apps appear to set same value
2031 * in both addresses.
2032 */
2033 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2034
2035 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2036 if (xp->selector.dport)
2037 xp->selector.dport_mask = ~0;
2038
2039 xp->lft.soft_byte_limit = XFRM_INF;
2040 xp->lft.hard_byte_limit = XFRM_INF;
2041 xp->lft.soft_packet_limit = XFRM_INF;
2042 xp->lft.hard_packet_limit = XFRM_INF;
2043 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2044 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2045 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2046 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2047 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2048 }
2049 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2050 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2051 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2052 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2053 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2054 }
2055 xp->xfrm_nr = 0;
2056 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2057 (err = parse_ipsecrequests(xp, pol)) < 0)
2058 goto out;
2059
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2060 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2061 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2062 if (err) {
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2063 kfree(xp);
2064 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2065 }
2066
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2067 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2068 c.event = XFRM_SAP_UPDATED;
2069 else
2070 c.event = XFRM_SAP_ADDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2071
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2072 c.seq = hdr->sadb_msg_seq;
2073 c.pid = hdr->sadb_msg_pid;
2074
2075 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2076 xfrm_pol_put(xp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2077 return 0;
2078
2079out:
2080 kfree(xp);
2081 return err;
2082}
2083
2084static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2085{
2086 int err;
2087 struct sadb_address *sa;
2088 struct sadb_x_policy *pol;
2089 struct xfrm_policy *xp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2090 struct xfrm_selector sel;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2091 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2092
2093 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2094 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2095 !ext_hdrs[SADB_X_EXT_POLICY-1])
2096 return -EINVAL;
2097
2098 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2099 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2100 return -EINVAL;
2101
2102 memset(&sel, 0, sizeof(sel));
2103
2104 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2105 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2106 sel.prefixlen_s = sa->sadb_address_prefixlen;
2107 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2108 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2109 if (sel.sport)
2110 sel.sport_mask = ~0;
2111
2112 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2113 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2114 sel.prefixlen_d = sa->sadb_address_prefixlen;
2115 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2116 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2117 if (sel.dport)
2118 sel.dport_mask = ~0;
2119
2120 xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2121 if (xp == NULL)
2122 return -ENOENT;
2123
2124 err = 0;
2125
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2126 c.seq = hdr->sadb_msg_seq;
2127 c.pid = hdr->sadb_msg_pid;
2128 c.event = XFRM_SAP_DELETED;
2129 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2130
2131 xfrm_pol_put(xp);
2132 return err;
2133}
2134
2135static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2136{
2137 int err;
2138 struct sk_buff *out_skb;
2139 struct sadb_msg *out_hdr;
2140 err = 0;
2141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2142 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2143 if (IS_ERR(out_skb)) {
2144 err = PTR_ERR(out_skb);
2145 goto out;
2146 }
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2147 pfkey_xfrm_policy2msg(out_skb, xp, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2148
2149 out_hdr = (struct sadb_msg *) out_skb->data;
2150 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2151 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2152 out_hdr->sadb_msg_satype = 0;
2153 out_hdr->sadb_msg_errno = 0;
2154 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2155 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2156 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2157 err = 0;
2158
2159out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2160 return err;
2161}
2162
2163static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2164{
2165 int err;
2166 struct sadb_x_policy *pol;
2167 struct xfrm_policy *xp;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2168 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2169
2170 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2171 return -EINVAL;
2172
2173 xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2174 hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2175 if (xp == NULL)
2176 return -ENOENT;
2177
2178 err = 0;
2179
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2180 c.seq = hdr->sadb_msg_seq;
2181 c.pid = hdr->sadb_msg_pid;
2182 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
2183 c.data = 1; // to signal pfkey of SADB_X_SPDDELETE2
2184 c.event = XFRM_SAP_DELETED;
2185 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2186 } else {
2187 err = key_pol_get_resp(sk, xp, hdr, pol->sadb_x_policy_dir-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2190 xfrm_pol_put(xp);
2191 return err;
2192}
2193
2194static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2195{
2196 struct pfkey_dump_data *data = ptr;
2197 struct sk_buff *out_skb;
2198 struct sadb_msg *out_hdr;
2199
2200 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2201 if (IS_ERR(out_skb))
2202 return PTR_ERR(out_skb);
2203
2204 pfkey_xfrm_policy2msg(out_skb, xp, dir);
2205
2206 out_hdr = (struct sadb_msg *) out_skb->data;
2207 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2208 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2209 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2210 out_hdr->sadb_msg_errno = 0;
2211 out_hdr->sadb_msg_seq = count;
2212 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2213 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2214 return 0;
2215}
2216
2217static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2218{
2219 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2220
2221 return xfrm_policy_walk(dump_sp, &data);
2222}
2223
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2224static int key_notify_policy_flush(struct km_event *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2225{
2226 struct sk_buff *skb_out;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2227 struct sadb_msg *hdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2228
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2229 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2230 if (!skb_out)
2231 return -ENOBUFS;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2232 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2233 hdr->sadb_msg_seq = c->seq;
2234 hdr->sadb_msg_pid = c->pid;
2235 hdr->sadb_msg_version = PF_KEY_V2;
2236 hdr->sadb_msg_errno = (uint8_t) 0;
2237 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2238 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2239 return 0;
2240
2241}
2242
2243static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2244{
2245 struct km_event c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2246
2247 xfrm_policy_flush();
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2248 c.event = XFRM_SAP_FLUSHED;
2249 c.pid = hdr->sadb_msg_pid;
2250 c.seq = hdr->sadb_msg_seq;
2251 km_policy_notify(NULL, 0, &c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2252
2253 return 0;
2254}
2255
2256typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2257 struct sadb_msg *hdr, void **ext_hdrs);
2258static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2259 [SADB_RESERVED] = pfkey_reserved,
2260 [SADB_GETSPI] = pfkey_getspi,
2261 [SADB_UPDATE] = pfkey_add,
2262 [SADB_ADD] = pfkey_add,
2263 [SADB_DELETE] = pfkey_delete,
2264 [SADB_GET] = pfkey_get,
2265 [SADB_ACQUIRE] = pfkey_acquire,
2266 [SADB_REGISTER] = pfkey_register,
2267 [SADB_EXPIRE] = NULL,
2268 [SADB_FLUSH] = pfkey_flush,
2269 [SADB_DUMP] = pfkey_dump,
2270 [SADB_X_PROMISC] = pfkey_promisc,
2271 [SADB_X_PCHANGE] = NULL,
2272 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2273 [SADB_X_SPDADD] = pfkey_spdadd,
2274 [SADB_X_SPDDELETE] = pfkey_spddelete,
2275 [SADB_X_SPDGET] = pfkey_spdget,
2276 [SADB_X_SPDACQUIRE] = NULL,
2277 [SADB_X_SPDDUMP] = pfkey_spddump,
2278 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2279 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2280 [SADB_X_SPDDELETE2] = pfkey_spdget,
2281};
2282
2283static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2284{
2285 void *ext_hdrs[SADB_EXT_MAX];
2286 int err;
2287
2288 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2289 BROADCAST_PROMISC_ONLY, NULL);
2290
2291 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2292 err = parse_exthdrs(skb, hdr, ext_hdrs);
2293 if (!err) {
2294 err = -EOPNOTSUPP;
2295 if (pfkey_funcs[hdr->sadb_msg_type])
2296 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2297 }
2298 return err;
2299}
2300
2301static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2302{
2303 struct sadb_msg *hdr = NULL;
2304
2305 if (skb->len < sizeof(*hdr)) {
2306 *errp = -EMSGSIZE;
2307 } else {
2308 hdr = (struct sadb_msg *) skb->data;
2309 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2310 hdr->sadb_msg_reserved != 0 ||
2311 (hdr->sadb_msg_type <= SADB_RESERVED ||
2312 hdr->sadb_msg_type > SADB_MAX)) {
2313 hdr = NULL;
2314 *errp = -EINVAL;
2315 } else if (hdr->sadb_msg_len != (skb->len /
2316 sizeof(uint64_t)) ||
2317 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2318 sizeof(uint64_t))) {
2319 hdr = NULL;
2320 *errp = -EMSGSIZE;
2321 } else {
2322 *errp = 0;
2323 }
2324 }
2325 return hdr;
2326}
2327
2328static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2329{
2330 return t->aalgos & (1 << d->desc.sadb_alg_id);
2331}
2332
2333static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2334{
2335 return t->ealgos & (1 << d->desc.sadb_alg_id);
2336}
2337
2338static int count_ah_combs(struct xfrm_tmpl *t)
2339{
2340 int i, sz = 0;
2341
2342 for (i = 0; ; i++) {
2343 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2344 if (!aalg)
2345 break;
2346 if (aalg_tmpl_set(t, aalg) && aalg->available)
2347 sz += sizeof(struct sadb_comb);
2348 }
2349 return sz + sizeof(struct sadb_prop);
2350}
2351
2352static int count_esp_combs(struct xfrm_tmpl *t)
2353{
2354 int i, k, sz = 0;
2355
2356 for (i = 0; ; i++) {
2357 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2358 if (!ealg)
2359 break;
2360
2361 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2362 continue;
2363
2364 for (k = 1; ; k++) {
2365 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2366 if (!aalg)
2367 break;
2368
2369 if (aalg_tmpl_set(t, aalg) && aalg->available)
2370 sz += sizeof(struct sadb_comb);
2371 }
2372 }
2373 return sz + sizeof(struct sadb_prop);
2374}
2375
2376static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2377{
2378 struct sadb_prop *p;
2379 int i;
2380
2381 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2382 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2383 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2384 p->sadb_prop_replay = 32;
2385 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2386
2387 for (i = 0; ; i++) {
2388 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2389 if (!aalg)
2390 break;
2391
2392 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2393 struct sadb_comb *c;
2394 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2395 memset(c, 0, sizeof(*c));
2396 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2397 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2398 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2399 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2400 c->sadb_comb_hard_addtime = 24*60*60;
2401 c->sadb_comb_soft_addtime = 20*60*60;
2402 c->sadb_comb_hard_usetime = 8*60*60;
2403 c->sadb_comb_soft_usetime = 7*60*60;
2404 }
2405 }
2406}
2407
2408static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2409{
2410 struct sadb_prop *p;
2411 int i, k;
2412
2413 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2414 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2415 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2416 p->sadb_prop_replay = 32;
2417 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2418
2419 for (i=0; ; i++) {
2420 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2421 if (!ealg)
2422 break;
2423
2424 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2425 continue;
2426
2427 for (k = 1; ; k++) {
2428 struct sadb_comb *c;
2429 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2430 if (!aalg)
2431 break;
2432 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2433 continue;
2434 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2435 memset(c, 0, sizeof(*c));
2436 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2437 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2438 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2439 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2440 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2441 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2442 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2443 c->sadb_comb_hard_addtime = 24*60*60;
2444 c->sadb_comb_soft_addtime = 20*60*60;
2445 c->sadb_comb_hard_usetime = 8*60*60;
2446 c->sadb_comb_soft_usetime = 7*60*60;
2447 }
2448 }
2449}
2450
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2451static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2452{
2453 return 0;
2454}
2455
2456static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2457{
2458 struct sk_buff *out_skb;
2459 struct sadb_msg *out_hdr;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2460 int hard;
2461 int hsc;
2462
2463 hard = c->data;
2464 if (hard)
2465 hsc = 2;
2466 else
2467 hsc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2468
2469 out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2470 if (IS_ERR(out_skb))
2471 return PTR_ERR(out_skb);
2472
2473 out_hdr = (struct sadb_msg *) out_skb->data;
2474 out_hdr->sadb_msg_version = PF_KEY_V2;
2475 out_hdr->sadb_msg_type = SADB_EXPIRE;
2476 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2477 out_hdr->sadb_msg_errno = 0;
2478 out_hdr->sadb_msg_reserved = 0;
2479 out_hdr->sadb_msg_seq = 0;
2480 out_hdr->sadb_msg_pid = 0;
2481
2482 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2483 return 0;
2484}
2485
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]2486static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2487{
2488 switch (c->event) {
2489 case XFRM_SAP_EXPIRED:
2490 return key_notify_sa_expire(x, c);
2491 case XFRM_SAP_DELETED:
2492 case XFRM_SAP_ADDED:
2493 case XFRM_SAP_UPDATED:
2494 return key_notify_sa(x, c);
2495 case XFRM_SAP_FLUSHED:
2496 return key_notify_sa_flush(c);
2497 default:
2498 printk("pfkey: Unknown SA event %d\n", c->event);
2499 break;
2500 }
2501
2502 return 0;
2503}
2504
2505static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2506{
2507 switch (c->event) {
2508 case XFRM_SAP_EXPIRED:
2509 return key_notify_policy_expire(xp, c);
2510 case XFRM_SAP_DELETED:
2511 case XFRM_SAP_ADDED:
2512 case XFRM_SAP_UPDATED:
2513 return key_notify_policy(xp, dir, c);
2514 case XFRM_SAP_FLUSHED:
2515 return key_notify_policy_flush(c);
2516 default:
2517 printk("pfkey: Unknown policy event %d\n", c->event);
2518 break;
2519 }
2520
2521 return 0;
2522}
2523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]2524static u32 get_acqseq(void)
2525{
2526 u32 res;
2527 static u32 acqseq;
2528 static DEFINE_SPINLOCK(acqseq_lock);
2529
2530 spin_lock_bh(&acqseq_lock);
2531 res = (++acqseq ? : ++acqseq);
2532 spin_unlock_bh(&acqseq_lock);
2533 return res;
2534}
2535
2536static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2537{
2538 struct sk_buff *skb;
2539 struct sadb_msg *hdr;
2540 struct sadb_address *addr;
2541 struct sadb_x_policy *pol;
2542 struct sockaddr_in *sin;
2543#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2544 struct sockaddr_in6 *sin6;
2545#endif
2546 int sockaddr_size;
2547 int size;
2548
2549 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2550 if (!sockaddr_size)
2551 return -EINVAL;
2552
2553 size = sizeof(struct sadb_msg) +
2554 (sizeof(struct sadb_address) * 2) +
2555 (sockaddr_size * 2) +
2556 sizeof(struct sadb_x_policy);
2557
2558 if (x->id.proto == IPPROTO_AH)
2559 size += count_ah_combs(t);
2560 else if (x->id.proto == IPPROTO_ESP)
2561 size += count_esp_combs(t);
2562
2563 skb = alloc_skb(size + 16, GFP_ATOMIC);
2564 if (skb == NULL)
2565 return -ENOMEM;
2566
2567 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2568 hdr->sadb_msg_version = PF_KEY_V2;
2569 hdr->sadb_msg_type = SADB_ACQUIRE;
2570 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2571 hdr->sadb_msg_len = size / sizeof(uint64_t);
2572 hdr->sadb_msg_errno = 0;
2573 hdr->sadb_msg_reserved = 0;
2574 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2575 hdr->sadb_msg_pid = 0;
2576
2577 /* src address */
2578 addr = (struct sadb_address*) skb_put(skb,
2579 sizeof(struct sadb_address)+sockaddr_size);
2580 addr->sadb_address_len =
2581 (sizeof(struct sadb_address)+sockaddr_size)/
2582 sizeof(uint64_t);
2583 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2584 addr->sadb_address_proto = 0;
2585 addr->sadb_address_reserved = 0;
2586 if (x->props.family == AF_INET) {
2587 addr->sadb_address_prefixlen = 32;
2588
2589 sin = (struct sockaddr_in *) (addr + 1);
2590 sin->sin_family = AF_INET;
2591 sin->sin_addr.s_addr = x->props.saddr.a4;
2592 sin->sin_port = 0;
2593 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2594 }
2595#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2596 else if (x->props.family == AF_INET6) {
2597 addr->sadb_address_prefixlen = 128;
2598
2599 sin6 = (struct sockaddr_in6 *) (addr + 1);
2600 sin6->sin6_family = AF_INET6;
2601 sin6->sin6_port = 0;
2602 sin6->sin6_flowinfo = 0;
2603 memcpy(&sin6->sin6_addr,
2604 x->props.saddr.a6, sizeof(struct in6_addr));
2605 sin6->sin6_scope_id = 0;
2606 }
2607#endif
2608 else
2609 BUG();
2610
2611 /* dst address */
2612 addr = (struct sadb_address*) skb_put(skb,
2613 sizeof(struct sadb_address)+sockaddr_size);
2614 addr->sadb_address_len =
2615 (sizeof(struct sadb_address)+sockaddr_size)/
2616 sizeof(uint64_t);
2617 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2618 addr->sadb_address_proto = 0;
2619 addr->sadb_address_reserved = 0;
2620 if (x->props.family == AF_INET) {
2621 addr->sadb_address_prefixlen = 32;
2622
2623 sin = (struct sockaddr_in *) (addr + 1);
2624 sin->sin_family = AF_INET;
2625 sin->sin_addr.s_addr = x->id.daddr.a4;
2626 sin->sin_port = 0;
2627 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2628 }
2629#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2630 else if (x->props.family == AF_INET6) {
2631 addr->sadb_address_prefixlen = 128;
2632
2633 sin6 = (struct sockaddr_in6 *) (addr + 1);
2634 sin6->sin6_family = AF_INET6;
2635 sin6->sin6_port = 0;
2636 sin6->sin6_flowinfo = 0;
2637 memcpy(&sin6->sin6_addr,
2638 x->id.daddr.a6, sizeof(struct in6_addr));
2639 sin6->sin6_scope_id = 0;
2640 }
2641#endif
2642 else
2643 BUG();
2644
2645 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2646 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2647 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2648 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2649 pol->sadb_x_policy_dir = dir+1;
2650 pol->sadb_x_policy_id = xp->index;
2651
2652 /* Set sadb_comb's. */
2653 if (x->id.proto == IPPROTO_AH)
2654 dump_ah_combs(skb, t);
2655 else if (x->id.proto == IPPROTO_ESP)
2656 dump_esp_combs(skb, t);
2657
2658 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2659}
2660
2661static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2662 u8 *data, int len, int *dir)
2663{
2664 struct xfrm_policy *xp;
2665 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2666
2667 switch (family) {
2668 case AF_INET:
2669 if (opt != IP_IPSEC_POLICY) {
2670 *dir = -EOPNOTSUPP;
2671 return NULL;
2672 }
2673 break;
2674#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2675 case AF_INET6:
2676 if (opt != IPV6_IPSEC_POLICY) {
2677 *dir = -EOPNOTSUPP;
2678 return NULL;
2679 }
2680 break;
2681#endif
2682 default:
2683 *dir = -EINVAL;
2684 return NULL;
2685 }
2686
2687 *dir = -EINVAL;
2688
2689 if (len < sizeof(struct sadb_x_policy) ||
2690 pol->sadb_x_policy_len*8 > len ||
2691 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2692 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2693 return NULL;
2694
2695 xp = xfrm_policy_alloc(GFP_ATOMIC);
2696 if (xp == NULL) {
2697 *dir = -ENOBUFS;
2698 return NULL;
2699 }
2700
2701 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2702 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2703
2704 xp->lft.soft_byte_limit = XFRM_INF;
2705 xp->lft.hard_byte_limit = XFRM_INF;
2706 xp->lft.soft_packet_limit = XFRM_INF;
2707 xp->lft.hard_packet_limit = XFRM_INF;
2708 xp->family = family;
2709
2710 xp->xfrm_nr = 0;
2711 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2712 (*dir = parse_ipsecrequests(xp, pol)) < 0)
2713 goto out;
2714
2715 *dir = pol->sadb_x_policy_dir-1;
2716 return xp;
2717
2718out:
2719 kfree(xp);
2720 return NULL;
2721}
2722
2723static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2724{
2725 struct sk_buff *skb;
2726 struct sadb_msg *hdr;
2727 struct sadb_sa *sa;
2728 struct sadb_address *addr;
2729 struct sadb_x_nat_t_port *n_port;
2730 struct sockaddr_in *sin;
2731#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2732 struct sockaddr_in6 *sin6;
2733#endif
2734 int sockaddr_size;
2735 int size;
2736 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2737 struct xfrm_encap_tmpl *natt = NULL;
2738
2739 sockaddr_size = pfkey_sockaddr_size(x->props.family);
2740 if (!sockaddr_size)
2741 return -EINVAL;
2742
2743 if (!satype)
2744 return -EINVAL;
2745
2746 if (!x->encap)
2747 return -EINVAL;
2748
2749 natt = x->encap;
2750
2751 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2752 *
2753 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2754 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2755 */
2756
2757 size = sizeof(struct sadb_msg) +
2758 sizeof(struct sadb_sa) +
2759 (sizeof(struct sadb_address) * 2) +
2760 (sockaddr_size * 2) +
2761 (sizeof(struct sadb_x_nat_t_port) * 2);
2762
2763 skb = alloc_skb(size + 16, GFP_ATOMIC);
2764 if (skb == NULL)
2765 return -ENOMEM;
2766
2767 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2768 hdr->sadb_msg_version = PF_KEY_V2;
2769 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2770 hdr->sadb_msg_satype = satype;
2771 hdr->sadb_msg_len = size / sizeof(uint64_t);
2772 hdr->sadb_msg_errno = 0;
2773 hdr->sadb_msg_reserved = 0;
2774 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2775 hdr->sadb_msg_pid = 0;
2776
2777 /* SA */
2778 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2779 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2780 sa->sadb_sa_exttype = SADB_EXT_SA;
2781 sa->sadb_sa_spi = x->id.spi;
2782 sa->sadb_sa_replay = 0;
2783 sa->sadb_sa_state = 0;
2784 sa->sadb_sa_auth = 0;
2785 sa->sadb_sa_encrypt = 0;
2786 sa->sadb_sa_flags = 0;
2787
2788 /* ADDRESS_SRC (old addr) */
2789 addr = (struct sadb_address*)
2790 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2791 addr->sadb_address_len =
2792 (sizeof(struct sadb_address)+sockaddr_size)/
2793 sizeof(uint64_t);
2794 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2795 addr->sadb_address_proto = 0;
2796 addr->sadb_address_reserved = 0;
2797 if (x->props.family == AF_INET) {
2798 addr->sadb_address_prefixlen = 32;
2799
2800 sin = (struct sockaddr_in *) (addr + 1);
2801 sin->sin_family = AF_INET;
2802 sin->sin_addr.s_addr = x->props.saddr.a4;
2803 sin->sin_port = 0;
2804 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2805 }
2806#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2807 else if (x->props.family == AF_INET6) {
2808 addr->sadb_address_prefixlen = 128;
2809
2810 sin6 = (struct sockaddr_in6 *) (addr + 1);
2811 sin6->sin6_family = AF_INET6;
2812 sin6->sin6_port = 0;
2813 sin6->sin6_flowinfo = 0;
2814 memcpy(&sin6->sin6_addr,
2815 x->props.saddr.a6, sizeof(struct in6_addr));
2816 sin6->sin6_scope_id = 0;
2817 }
2818#endif
2819 else
2820 BUG();
2821
2822 /* NAT_T_SPORT (old port) */
2823 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2824 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2825 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2826 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2827 n_port->sadb_x_nat_t_port_reserved = 0;
2828
2829 /* ADDRESS_DST (new addr) */
2830 addr = (struct sadb_address*)
2831 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2832 addr->sadb_address_len =
2833 (sizeof(struct sadb_address)+sockaddr_size)/
2834 sizeof(uint64_t);
2835 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2836 addr->sadb_address_proto = 0;
2837 addr->sadb_address_reserved = 0;
2838 if (x->props.family == AF_INET) {
2839 addr->sadb_address_prefixlen = 32;
2840
2841 sin = (struct sockaddr_in *) (addr + 1);
2842 sin->sin_family = AF_INET;
2843 sin->sin_addr.s_addr = ipaddr->a4;
2844 sin->sin_port = 0;
2845 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2846 }
2847#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2848 else if (x->props.family == AF_INET6) {
2849 addr->sadb_address_prefixlen = 128;
2850
2851 sin6 = (struct sockaddr_in6 *) (addr + 1);
2852 sin6->sin6_family = AF_INET6;
2853 sin6->sin6_port = 0;
2854 sin6->sin6_flowinfo = 0;
2855 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2856 sin6->sin6_scope_id = 0;
2857 }
2858#endif
2859 else
2860 BUG();
2861
2862 /* NAT_T_DPORT (new port) */
2863 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2864 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2865 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2866 n_port->sadb_x_nat_t_port_port = sport;
2867 n_port->sadb_x_nat_t_port_reserved = 0;
2868
2869 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2870}
2871
2872static int pfkey_sendmsg(struct kiocb *kiocb,
2873 struct socket *sock, struct msghdr *msg, size_t len)
2874{
2875 struct sock *sk = sock->sk;
2876 struct sk_buff *skb = NULL;
2877 struct sadb_msg *hdr = NULL;
2878 int err;
2879
2880 err = -EOPNOTSUPP;
2881 if (msg->msg_flags & MSG_OOB)
2882 goto out;
2883
2884 err = -EMSGSIZE;
2885 if ((unsigned)len > sk->sk_sndbuf - 32)
2886 goto out;
2887
2888 err = -ENOBUFS;
2889 skb = alloc_skb(len, GFP_KERNEL);
2890 if (skb == NULL)
2891 goto out;
2892
2893 err = -EFAULT;
2894 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2895 goto out;
2896
2897 hdr = pfkey_get_base_msg(skb, &err);
2898 if (!hdr)
2899 goto out;
2900
2901 down(&xfrm_cfg_sem);
2902 err = pfkey_process(sk, skb, hdr);
2903 up(&xfrm_cfg_sem);
2904
2905out:
2906 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2907 err = 0;
2908 if (skb)
2909 kfree_skb(skb);
2910
2911 return err ? : len;
2912}
2913
2914static int pfkey_recvmsg(struct kiocb *kiocb,
2915 struct socket *sock, struct msghdr *msg, size_t len,
2916 int flags)
2917{
2918 struct sock *sk = sock->sk;
2919 struct sk_buff *skb;
2920 int copied, err;
2921
2922 err = -EINVAL;
2923 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2924 goto out;
2925
2926 msg->msg_namelen = 0;
2927 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2928 if (skb == NULL)
2929 goto out;
2930
2931 copied = skb->len;
2932 if (copied > len) {
2933 msg->msg_flags |= MSG_TRUNC;
2934 copied = len;
2935 }
2936
2937 skb->h.raw = skb->data;
2938 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2939 if (err)
2940 goto out_free;
2941
2942 sock_recv_timestamp(msg, sk, skb);
2943
2944 err = (flags & MSG_TRUNC) ? skb->len : copied;
2945
2946out_free:
2947 skb_free_datagram(sk, skb);
2948out:
2949 return err;
2950}
2951
2952static struct proto_ops pfkey_ops = {
2953 .family = PF_KEY,
2954 .owner = THIS_MODULE,
2955 /* Operations that make no sense on pfkey sockets. */
2956 .bind = sock_no_bind,
2957 .connect = sock_no_connect,
2958 .socketpair = sock_no_socketpair,
2959 .accept = sock_no_accept,
2960 .getname = sock_no_getname,
2961 .ioctl = sock_no_ioctl,
2962 .listen = sock_no_listen,
2963 .shutdown = sock_no_shutdown,
2964 .setsockopt = sock_no_setsockopt,
2965 .getsockopt = sock_no_getsockopt,
2966 .mmap = sock_no_mmap,
2967 .sendpage = sock_no_sendpage,
2968
2969 /* Now the operations that really occur. */
2970 .release = pfkey_release,
2971 .poll = datagram_poll,
2972 .sendmsg = pfkey_sendmsg,
2973 .recvmsg = pfkey_recvmsg,
2974};
2975
2976static struct net_proto_family pfkey_family_ops = {
2977 .family = PF_KEY,
2978 .create = pfkey_create,
2979 .owner = THIS_MODULE,
2980};
2981
2982#ifdef CONFIG_PROC_FS
2983static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2984 int length, int *eof, void *data)
2985{
2986 off_t pos = 0;
2987 off_t begin = 0;
2988 int len = 0;
2989 struct sock *s;
2990 struct hlist_node *node;
2991
2992 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n");
2993
2994 read_lock(&pfkey_table_lock);
2995
2996 sk_for_each(s, node, &pfkey_table) {
2997 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2998 s,
2999 atomic_read(&s->sk_refcnt),
3000 atomic_read(&s->sk_rmem_alloc),
3001 atomic_read(&s->sk_wmem_alloc),
3002 sock_i_uid(s),
3003 sock_i_ino(s)
3004 );
3005
3006 buffer[len++] = '\n';
3007
3008 pos = begin + len;
3009 if (pos < offset) {
3010 len = 0;
3011 begin = pos;
3012 }
3013 if(pos > offset + length)
3014 goto done;
3015 }
3016 *eof = 1;
3017
3018done:
3019 read_unlock(&pfkey_table_lock);
3020
3021 *start = buffer + (offset - begin);
3022 len -= (offset - begin);
3023
3024 if (len > length)
3025 len = length;
3026 if (len < 0)
3027 len = 0;
3028
3029 return len;
3030}
3031#endif
3032
3033static struct xfrm_mgr pfkeyv2_mgr =
3034{
3035 .id = "pfkeyv2",
3036 .notify = pfkey_send_notify,
3037 .acquire = pfkey_send_acquire,
3038 .compile_policy = pfkey_compile_policy,
3039 .new_mapping = pfkey_send_new_mapping,
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700[diff] [blame]3040 .notify_policy = pfkey_send_policy_notify,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]3041};
3042
3043static void __exit ipsec_pfkey_exit(void)
3044{
3045 xfrm_unregister_km(&pfkeyv2_mgr);
3046 remove_proc_entry("net/pfkey", NULL);
3047 sock_unregister(PF_KEY);
3048 proto_unregister(&key_proto);
3049}
3050
3051static int __init ipsec_pfkey_init(void)
3052{
3053 int err = proto_register(&key_proto, 0);
3054
3055 if (err != 0)
3056 goto out;
3057
3058 err = sock_register(&pfkey_family_ops);
3059 if (err != 0)
3060 goto out_unregister_key_proto;
3061#ifdef CONFIG_PROC_FS
3062 err = -ENOMEM;
3063 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3064 goto out_sock_unregister;
3065#endif
3066 err = xfrm_register_km(&pfkeyv2_mgr);
3067 if (err != 0)
3068 goto out_remove_proc_entry;
3069out:
3070 return err;
3071out_remove_proc_entry:
3072#ifdef CONFIG_PROC_FS
3073 remove_proc_entry("net/pfkey", NULL);
3074out_sock_unregister:
3075#endif
3076 sock_unregister(PF_KEY);
3077out_unregister_key_proto:
3078 proto_unregister(&key_proto);
3079 goto out;
3080}
3081
3082module_init(ipsec_pfkey_init);
3083module_exit(ipsec_pfkey_exit);
3084MODULE_LICENSE("GPL");
3085MODULE_ALIAS_NETPROTO(PF_KEY);