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[deliverable/linux.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <net/net_namespace.h>
30 #include <net/netns/generic.h>
31 #include <net/xfrm.h>
32
33 #include <net/sock.h>
34
35 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
36 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
37
38 static int pfkey_net_id __read_mostly;
39 struct netns_pfkey {
40 /* List of all pfkey sockets. */
41 struct hlist_head table;
42 atomic_t socks_nr;
43 };
44 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
45 static DEFINE_RWLOCK(pfkey_table_lock);
46 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
47
48 struct pfkey_sock {
49 /* struct sock must be the first member of struct pfkey_sock */
50 struct sock sk;
51 int registered;
52 int promisc;
53
54 struct {
55 uint8_t msg_version;
56 uint32_t msg_pid;
57 int (*dump)(struct pfkey_sock *sk);
58 void (*done)(struct pfkey_sock *sk);
59 union {
60 struct xfrm_policy_walk policy;
61 struct xfrm_state_walk state;
62 } u;
63 struct sk_buff *skb;
64 } dump;
65 };
66
67 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
68 {
69 return (struct pfkey_sock *)sk;
70 }
71
72 static int pfkey_can_dump(struct sock *sk)
73 {
74 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
75 return 1;
76 return 0;
77 }
78
79 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
80 {
81 if (pfk->dump.dump) {
82 if (pfk->dump.skb) {
83 kfree_skb(pfk->dump.skb);
84 pfk->dump.skb = NULL;
85 }
86 pfk->dump.done(pfk);
87 pfk->dump.dump = NULL;
88 pfk->dump.done = NULL;
89 }
90 }
91
92 static void pfkey_sock_destruct(struct sock *sk)
93 {
94 struct net *net = sock_net(sk);
95 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
96
97 pfkey_terminate_dump(pfkey_sk(sk));
98 skb_queue_purge(&sk->sk_receive_queue);
99
100 if (!sock_flag(sk, SOCK_DEAD)) {
101 printk("Attempt to release alive pfkey socket: %p\n", sk);
102 return;
103 }
104
105 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
106 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
107
108 atomic_dec(&net_pfkey->socks_nr);
109 }
110
111 static void pfkey_table_grab(void)
112 {
113 write_lock_bh(&pfkey_table_lock);
114
115 if (atomic_read(&pfkey_table_users)) {
116 DECLARE_WAITQUEUE(wait, current);
117
118 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
119 for(;;) {
120 set_current_state(TASK_UNINTERRUPTIBLE);
121 if (atomic_read(&pfkey_table_users) == 0)
122 break;
123 write_unlock_bh(&pfkey_table_lock);
124 schedule();
125 write_lock_bh(&pfkey_table_lock);
126 }
127
128 __set_current_state(TASK_RUNNING);
129 remove_wait_queue(&pfkey_table_wait, &wait);
130 }
131 }
132
133 static __inline__ void pfkey_table_ungrab(void)
134 {
135 write_unlock_bh(&pfkey_table_lock);
136 wake_up(&pfkey_table_wait);
137 }
138
139 static __inline__ void pfkey_lock_table(void)
140 {
141 /* read_lock() synchronizes us to pfkey_table_grab */
142
143 read_lock(&pfkey_table_lock);
144 atomic_inc(&pfkey_table_users);
145 read_unlock(&pfkey_table_lock);
146 }
147
148 static __inline__ void pfkey_unlock_table(void)
149 {
150 if (atomic_dec_and_test(&pfkey_table_users))
151 wake_up(&pfkey_table_wait);
152 }
153
154
155 static const struct proto_ops pfkey_ops;
156
157 static void pfkey_insert(struct sock *sk)
158 {
159 struct net *net = sock_net(sk);
160 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
161
162 pfkey_table_grab();
163 sk_add_node(sk, &net_pfkey->table);
164 pfkey_table_ungrab();
165 }
166
167 static void pfkey_remove(struct sock *sk)
168 {
169 pfkey_table_grab();
170 sk_del_node_init(sk);
171 pfkey_table_ungrab();
172 }
173
174 static struct proto key_proto = {
175 .name = "KEY",
176 .owner = THIS_MODULE,
177 .obj_size = sizeof(struct pfkey_sock),
178 };
179
180 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
181 int kern)
182 {
183 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
184 struct sock *sk;
185 int err;
186
187 if (!capable(CAP_NET_ADMIN))
188 return -EPERM;
189 if (sock->type != SOCK_RAW)
190 return -ESOCKTNOSUPPORT;
191 if (protocol != PF_KEY_V2)
192 return -EPROTONOSUPPORT;
193
194 err = -ENOMEM;
195 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
196 if (sk == NULL)
197 goto out;
198
199 sock->ops = &pfkey_ops;
200 sock_init_data(sock, sk);
201
202 sk->sk_family = PF_KEY;
203 sk->sk_destruct = pfkey_sock_destruct;
204
205 atomic_inc(&net_pfkey->socks_nr);
206
207 pfkey_insert(sk);
208
209 return 0;
210 out:
211 return err;
212 }
213
214 static int pfkey_release(struct socket *sock)
215 {
216 struct sock *sk = sock->sk;
217
218 if (!sk)
219 return 0;
220
221 pfkey_remove(sk);
222
223 sock_orphan(sk);
224 sock->sk = NULL;
225 skb_queue_purge(&sk->sk_write_queue);
226 sock_put(sk);
227
228 return 0;
229 }
230
231 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
232 gfp_t allocation, struct sock *sk)
233 {
234 int err = -ENOBUFS;
235
236 sock_hold(sk);
237 if (*skb2 == NULL) {
238 if (atomic_read(&skb->users) != 1) {
239 *skb2 = skb_clone(skb, allocation);
240 } else {
241 *skb2 = skb;
242 atomic_inc(&skb->users);
243 }
244 }
245 if (*skb2 != NULL) {
246 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
247 skb_orphan(*skb2);
248 skb_set_owner_r(*skb2, sk);
249 skb_queue_tail(&sk->sk_receive_queue, *skb2);
250 sk->sk_data_ready(sk, (*skb2)->len);
251 *skb2 = NULL;
252 err = 0;
253 }
254 }
255 sock_put(sk);
256 return err;
257 }
258
259 /* Send SKB to all pfkey sockets matching selected criteria. */
260 #define BROADCAST_ALL 0
261 #define BROADCAST_ONE 1
262 #define BROADCAST_REGISTERED 2
263 #define BROADCAST_PROMISC_ONLY 4
264 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
265 int broadcast_flags, struct sock *one_sk,
266 struct net *net)
267 {
268 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
269 struct sock *sk;
270 struct hlist_node *node;
271 struct sk_buff *skb2 = NULL;
272 int err = -ESRCH;
273
274 /* XXX Do we need something like netlink_overrun? I think
275 * XXX PF_KEY socket apps will not mind current behavior.
276 */
277 if (!skb)
278 return -ENOMEM;
279
280 pfkey_lock_table();
281 sk_for_each(sk, node, &net_pfkey->table) {
282 struct pfkey_sock *pfk = pfkey_sk(sk);
283 int err2;
284
285 /* Yes, it means that if you are meant to receive this
286 * pfkey message you receive it twice as promiscuous
287 * socket.
288 */
289 if (pfk->promisc)
290 pfkey_broadcast_one(skb, &skb2, allocation, sk);
291
292 /* the exact target will be processed later */
293 if (sk == one_sk)
294 continue;
295 if (broadcast_flags != BROADCAST_ALL) {
296 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
297 continue;
298 if ((broadcast_flags & BROADCAST_REGISTERED) &&
299 !pfk->registered)
300 continue;
301 if (broadcast_flags & BROADCAST_ONE)
302 continue;
303 }
304
305 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
306
307 /* Error is cleare after succecful sending to at least one
308 * registered KM */
309 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
310 err = err2;
311 }
312 pfkey_unlock_table();
313
314 if (one_sk != NULL)
315 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
316
317 kfree_skb(skb2);
318 kfree_skb(skb);
319 return err;
320 }
321
322 static int pfkey_do_dump(struct pfkey_sock *pfk)
323 {
324 struct sadb_msg *hdr;
325 int rc;
326
327 rc = pfk->dump.dump(pfk);
328 if (rc == -ENOBUFS)
329 return 0;
330
331 if (pfk->dump.skb) {
332 if (!pfkey_can_dump(&pfk->sk))
333 return 0;
334
335 hdr = (struct sadb_msg *) pfk->dump.skb->data;
336 hdr->sadb_msg_seq = 0;
337 hdr->sadb_msg_errno = rc;
338 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
339 &pfk->sk, sock_net(&pfk->sk));
340 pfk->dump.skb = NULL;
341 }
342
343 pfkey_terminate_dump(pfk);
344 return rc;
345 }
346
347 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
348 {
349 *new = *orig;
350 }
351
352 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
353 {
354 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
355 struct sadb_msg *hdr;
356
357 if (!skb)
358 return -ENOBUFS;
359
360 /* Woe be to the platform trying to support PFKEY yet
361 * having normal errnos outside the 1-255 range, inclusive.
362 */
363 err = -err;
364 if (err == ERESTARTSYS ||
365 err == ERESTARTNOHAND ||
366 err == ERESTARTNOINTR)
367 err = EINTR;
368 if (err >= 512)
369 err = EINVAL;
370 BUG_ON(err <= 0 || err >= 256);
371
372 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
373 pfkey_hdr_dup(hdr, orig);
374 hdr->sadb_msg_errno = (uint8_t) err;
375 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
376 sizeof(uint64_t));
377
378 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
379
380 return 0;
381 }
382
383 static u8 sadb_ext_min_len[] = {
384 [SADB_EXT_RESERVED] = (u8) 0,
385 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
386 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
387 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
388 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
389 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
390 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
391 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
392 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
393 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
394 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
395 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
396 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
397 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
398 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
399 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
400 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
401 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
402 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
403 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
404 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
405 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
406 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
407 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
408 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
409 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
410 };
411
412 /* Verify sadb_address_{len,prefixlen} against sa_family. */
413 static int verify_address_len(void *p)
414 {
415 struct sadb_address *sp = p;
416 struct sockaddr *addr = (struct sockaddr *)(sp + 1);
417 struct sockaddr_in *sin;
418 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
419 struct sockaddr_in6 *sin6;
420 #endif
421 int len;
422
423 switch (addr->sa_family) {
424 case AF_INET:
425 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
426 if (sp->sadb_address_len != len ||
427 sp->sadb_address_prefixlen > 32)
428 return -EINVAL;
429 break;
430 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
431 case AF_INET6:
432 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
433 if (sp->sadb_address_len != len ||
434 sp->sadb_address_prefixlen > 128)
435 return -EINVAL;
436 break;
437 #endif
438 default:
439 /* It is user using kernel to keep track of security
440 * associations for another protocol, such as
441 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
442 * lengths.
443 *
444 * XXX Actually, association/policy database is not yet
445 * XXX able to cope with arbitrary sockaddr families.
446 * XXX When it can, remove this -EINVAL. -DaveM
447 */
448 return -EINVAL;
449 break;
450 }
451
452 return 0;
453 }
454
455 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
456 {
457 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
458 sec_ctx->sadb_x_ctx_len,
459 sizeof(uint64_t));
460 }
461
462 static inline int verify_sec_ctx_len(void *p)
463 {
464 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
465 int len = sec_ctx->sadb_x_ctx_len;
466
467 if (len > PAGE_SIZE)
468 return -EINVAL;
469
470 len = pfkey_sec_ctx_len(sec_ctx);
471
472 if (sec_ctx->sadb_x_sec_len != len)
473 return -EINVAL;
474
475 return 0;
476 }
477
478 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
479 {
480 struct xfrm_user_sec_ctx *uctx = NULL;
481 int ctx_size = sec_ctx->sadb_x_ctx_len;
482
483 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
484
485 if (!uctx)
486 return NULL;
487
488 uctx->len = pfkey_sec_ctx_len(sec_ctx);
489 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
490 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
491 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
492 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
493 memcpy(uctx + 1, sec_ctx + 1,
494 uctx->ctx_len);
495
496 return uctx;
497 }
498
499 static int present_and_same_family(struct sadb_address *src,
500 struct sadb_address *dst)
501 {
502 struct sockaddr *s_addr, *d_addr;
503
504 if (!src || !dst)
505 return 0;
506
507 s_addr = (struct sockaddr *)(src + 1);
508 d_addr = (struct sockaddr *)(dst + 1);
509 if (s_addr->sa_family != d_addr->sa_family)
510 return 0;
511 if (s_addr->sa_family != AF_INET
512 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
513 && s_addr->sa_family != AF_INET6
514 #endif
515 )
516 return 0;
517
518 return 1;
519 }
520
521 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
522 {
523 char *p = (char *) hdr;
524 int len = skb->len;
525
526 len -= sizeof(*hdr);
527 p += sizeof(*hdr);
528 while (len > 0) {
529 struct sadb_ext *ehdr = (struct sadb_ext *) p;
530 uint16_t ext_type;
531 int ext_len;
532
533 ext_len = ehdr->sadb_ext_len;
534 ext_len *= sizeof(uint64_t);
535 ext_type = ehdr->sadb_ext_type;
536 if (ext_len < sizeof(uint64_t) ||
537 ext_len > len ||
538 ext_type == SADB_EXT_RESERVED)
539 return -EINVAL;
540
541 if (ext_type <= SADB_EXT_MAX) {
542 int min = (int) sadb_ext_min_len[ext_type];
543 if (ext_len < min)
544 return -EINVAL;
545 if (ext_hdrs[ext_type-1] != NULL)
546 return -EINVAL;
547 if (ext_type == SADB_EXT_ADDRESS_SRC ||
548 ext_type == SADB_EXT_ADDRESS_DST ||
549 ext_type == SADB_EXT_ADDRESS_PROXY ||
550 ext_type == SADB_X_EXT_NAT_T_OA) {
551 if (verify_address_len(p))
552 return -EINVAL;
553 }
554 if (ext_type == SADB_X_EXT_SEC_CTX) {
555 if (verify_sec_ctx_len(p))
556 return -EINVAL;
557 }
558 ext_hdrs[ext_type-1] = p;
559 }
560 p += ext_len;
561 len -= ext_len;
562 }
563
564 return 0;
565 }
566
567 static uint16_t
568 pfkey_satype2proto(uint8_t satype)
569 {
570 switch (satype) {
571 case SADB_SATYPE_UNSPEC:
572 return IPSEC_PROTO_ANY;
573 case SADB_SATYPE_AH:
574 return IPPROTO_AH;
575 case SADB_SATYPE_ESP:
576 return IPPROTO_ESP;
577 case SADB_X_SATYPE_IPCOMP:
578 return IPPROTO_COMP;
579 break;
580 default:
581 return 0;
582 }
583 /* NOTREACHED */
584 }
585
586 static uint8_t
587 pfkey_proto2satype(uint16_t proto)
588 {
589 switch (proto) {
590 case IPPROTO_AH:
591 return SADB_SATYPE_AH;
592 case IPPROTO_ESP:
593 return SADB_SATYPE_ESP;
594 case IPPROTO_COMP:
595 return SADB_X_SATYPE_IPCOMP;
596 break;
597 default:
598 return 0;
599 }
600 /* NOTREACHED */
601 }
602
603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
604 * say specifically 'just raw sockets' as we encode them as 255.
605 */
606
607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
608 {
609 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
610 }
611
612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
613 {
614 return (proto ? proto : IPSEC_PROTO_ANY);
615 }
616
617 static inline int pfkey_sockaddr_len(sa_family_t family)
618 {
619 switch (family) {
620 case AF_INET:
621 return sizeof(struct sockaddr_in);
622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
623 case AF_INET6:
624 return sizeof(struct sockaddr_in6);
625 #endif
626 }
627 return 0;
628 }
629
630 static
631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
632 {
633 switch (sa->sa_family) {
634 case AF_INET:
635 xaddr->a4 =
636 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
637 return AF_INET;
638 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
639 case AF_INET6:
640 memcpy(xaddr->a6,
641 &((struct sockaddr_in6 *)sa)->sin6_addr,
642 sizeof(struct in6_addr));
643 return AF_INET6;
644 #endif
645 }
646 return 0;
647 }
648
649 static
650 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
651 {
652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
653 xaddr);
654 }
655
656 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs)
657 {
658 struct sadb_sa *sa;
659 struct sadb_address *addr;
660 uint16_t proto;
661 unsigned short family;
662 xfrm_address_t *xaddr;
663
664 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
665 if (sa == NULL)
666 return NULL;
667
668 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
669 if (proto == 0)
670 return NULL;
671
672 /* sadb_address_len should be checked by caller */
673 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
674 if (addr == NULL)
675 return NULL;
676
677 family = ((struct sockaddr *)(addr + 1))->sa_family;
678 switch (family) {
679 case AF_INET:
680 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
681 break;
682 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
683 case AF_INET6:
684 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
685 break;
686 #endif
687 default:
688 xaddr = NULL;
689 }
690
691 if (!xaddr)
692 return NULL;
693
694 return xfrm_state_lookup(net, xaddr, sa->sadb_sa_spi, proto, family);
695 }
696
697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
698
699 static int
700 pfkey_sockaddr_size(sa_family_t family)
701 {
702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
703 }
704
705 static inline int pfkey_mode_from_xfrm(int mode)
706 {
707 switch(mode) {
708 case XFRM_MODE_TRANSPORT:
709 return IPSEC_MODE_TRANSPORT;
710 case XFRM_MODE_TUNNEL:
711 return IPSEC_MODE_TUNNEL;
712 case XFRM_MODE_BEET:
713 return IPSEC_MODE_BEET;
714 default:
715 return -1;
716 }
717 }
718
719 static inline int pfkey_mode_to_xfrm(int mode)
720 {
721 switch(mode) {
722 case IPSEC_MODE_ANY: /*XXX*/
723 case IPSEC_MODE_TRANSPORT:
724 return XFRM_MODE_TRANSPORT;
725 case IPSEC_MODE_TUNNEL:
726 return XFRM_MODE_TUNNEL;
727 case IPSEC_MODE_BEET:
728 return XFRM_MODE_BEET;
729 default:
730 return -1;
731 }
732 }
733
734 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
735 struct sockaddr *sa,
736 unsigned short family)
737 {
738 switch (family) {
739 case AF_INET:
740 {
741 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
742 sin->sin_family = AF_INET;
743 sin->sin_port = port;
744 sin->sin_addr.s_addr = xaddr->a4;
745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
746 return 32;
747 }
748 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
749 case AF_INET6:
750 {
751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
752 sin6->sin6_family = AF_INET6;
753 sin6->sin6_port = port;
754 sin6->sin6_flowinfo = 0;
755 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
756 sin6->sin6_scope_id = 0;
757 return 128;
758 }
759 #endif
760 }
761 return 0;
762 }
763
764 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
765 int add_keys, int hsc)
766 {
767 struct sk_buff *skb;
768 struct sadb_msg *hdr;
769 struct sadb_sa *sa;
770 struct sadb_lifetime *lifetime;
771 struct sadb_address *addr;
772 struct sadb_key *key;
773 struct sadb_x_sa2 *sa2;
774 struct sadb_x_sec_ctx *sec_ctx;
775 struct xfrm_sec_ctx *xfrm_ctx;
776 int ctx_size = 0;
777 int size;
778 int auth_key_size = 0;
779 int encrypt_key_size = 0;
780 int sockaddr_size;
781 struct xfrm_encap_tmpl *natt = NULL;
782 int mode;
783
784 /* address family check */
785 sockaddr_size = pfkey_sockaddr_size(x->props.family);
786 if (!sockaddr_size)
787 return ERR_PTR(-EINVAL);
788
789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
790 key(AE), (identity(SD),) (sensitivity)> */
791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
792 sizeof(struct sadb_lifetime) +
793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
795 sizeof(struct sadb_address)*2 +
796 sockaddr_size*2 +
797 sizeof(struct sadb_x_sa2);
798
799 if ((xfrm_ctx = x->security)) {
800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
802 }
803
804 /* identity & sensitivity */
805 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
806 size += sizeof(struct sadb_address) + sockaddr_size;
807
808 if (add_keys) {
809 if (x->aalg && x->aalg->alg_key_len) {
810 auth_key_size =
811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
812 size += sizeof(struct sadb_key) + auth_key_size;
813 }
814 if (x->ealg && x->ealg->alg_key_len) {
815 encrypt_key_size =
816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
817 size += sizeof(struct sadb_key) + encrypt_key_size;
818 }
819 }
820 if (x->encap)
821 natt = x->encap;
822
823 if (natt && natt->encap_type) {
824 size += sizeof(struct sadb_x_nat_t_type);
825 size += sizeof(struct sadb_x_nat_t_port);
826 size += sizeof(struct sadb_x_nat_t_port);
827 }
828
829 skb = alloc_skb(size + 16, GFP_ATOMIC);
830 if (skb == NULL)
831 return ERR_PTR(-ENOBUFS);
832
833 /* call should fill header later */
834 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
835 memset(hdr, 0, size); /* XXX do we need this ? */
836 hdr->sadb_msg_len = size / sizeof(uint64_t);
837
838 /* sa */
839 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
841 sa->sadb_sa_exttype = SADB_EXT_SA;
842 sa->sadb_sa_spi = x->id.spi;
843 sa->sadb_sa_replay = x->props.replay_window;
844 switch (x->km.state) {
845 case XFRM_STATE_VALID:
846 sa->sadb_sa_state = x->km.dying ?
847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
848 break;
849 case XFRM_STATE_ACQ:
850 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
851 break;
852 default:
853 sa->sadb_sa_state = SADB_SASTATE_DEAD;
854 break;
855 }
856 sa->sadb_sa_auth = 0;
857 if (x->aalg) {
858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
859 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
860 }
861 sa->sadb_sa_encrypt = 0;
862 BUG_ON(x->ealg && x->calg);
863 if (x->ealg) {
864 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
865 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
866 }
867 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
868 if (x->calg) {
869 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
870 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
871 }
872
873 sa->sadb_sa_flags = 0;
874 if (x->props.flags & XFRM_STATE_NOECN)
875 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
876 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
877 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
878 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
879 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
880
881 /* hard time */
882 if (hsc & 2) {
883 lifetime = (struct sadb_lifetime *) skb_put(skb,
884 sizeof(struct sadb_lifetime));
885 lifetime->sadb_lifetime_len =
886 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
887 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
888 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
889 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
890 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
891 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
892 }
893 /* soft time */
894 if (hsc & 1) {
895 lifetime = (struct sadb_lifetime *) skb_put(skb,
896 sizeof(struct sadb_lifetime));
897 lifetime->sadb_lifetime_len =
898 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
899 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
900 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
901 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
902 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
903 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
904 }
905 /* current time */
906 lifetime = (struct sadb_lifetime *) skb_put(skb,
907 sizeof(struct sadb_lifetime));
908 lifetime->sadb_lifetime_len =
909 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
911 lifetime->sadb_lifetime_allocations = x->curlft.packets;
912 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
913 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
914 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
915 /* src address */
916 addr = (struct sadb_address*) skb_put(skb,
917 sizeof(struct sadb_address)+sockaddr_size);
918 addr->sadb_address_len =
919 (sizeof(struct sadb_address)+sockaddr_size)/
920 sizeof(uint64_t);
921 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
922 /* "if the ports are non-zero, then the sadb_address_proto field,
923 normally zero, MUST be filled in with the transport
924 protocol's number." - RFC2367 */
925 addr->sadb_address_proto = 0;
926 addr->sadb_address_reserved = 0;
927
928 addr->sadb_address_prefixlen =
929 pfkey_sockaddr_fill(&x->props.saddr, 0,
930 (struct sockaddr *) (addr + 1),
931 x->props.family);
932 if (!addr->sadb_address_prefixlen)
933 BUG();
934
935 /* dst address */
936 addr = (struct sadb_address*) skb_put(skb,
937 sizeof(struct sadb_address)+sockaddr_size);
938 addr->sadb_address_len =
939 (sizeof(struct sadb_address)+sockaddr_size)/
940 sizeof(uint64_t);
941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
942 addr->sadb_address_proto = 0;
943 addr->sadb_address_reserved = 0;
944
945 addr->sadb_address_prefixlen =
946 pfkey_sockaddr_fill(&x->id.daddr, 0,
947 (struct sockaddr *) (addr + 1),
948 x->props.family);
949 if (!addr->sadb_address_prefixlen)
950 BUG();
951
952 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
953 x->props.family)) {
954 addr = (struct sadb_address*) skb_put(skb,
955 sizeof(struct sadb_address)+sockaddr_size);
956 addr->sadb_address_len =
957 (sizeof(struct sadb_address)+sockaddr_size)/
958 sizeof(uint64_t);
959 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
960 addr->sadb_address_proto =
961 pfkey_proto_from_xfrm(x->sel.proto);
962 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
963 addr->sadb_address_reserved = 0;
964
965 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
966 (struct sockaddr *) (addr + 1),
967 x->props.family);
968 }
969
970 /* auth key */
971 if (add_keys && auth_key_size) {
972 key = (struct sadb_key *) skb_put(skb,
973 sizeof(struct sadb_key)+auth_key_size);
974 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
975 sizeof(uint64_t);
976 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
977 key->sadb_key_bits = x->aalg->alg_key_len;
978 key->sadb_key_reserved = 0;
979 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
980 }
981 /* encrypt key */
982 if (add_keys && encrypt_key_size) {
983 key = (struct sadb_key *) skb_put(skb,
984 sizeof(struct sadb_key)+encrypt_key_size);
985 key->sadb_key_len = (sizeof(struct sadb_key) +
986 encrypt_key_size) / sizeof(uint64_t);
987 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
988 key->sadb_key_bits = x->ealg->alg_key_len;
989 key->sadb_key_reserved = 0;
990 memcpy(key + 1, x->ealg->alg_key,
991 (x->ealg->alg_key_len+7)/8);
992 }
993
994 /* sa */
995 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
996 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
997 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
998 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
999 kfree_skb(skb);
1000 return ERR_PTR(-EINVAL);
1001 }
1002 sa2->sadb_x_sa2_mode = mode;
1003 sa2->sadb_x_sa2_reserved1 = 0;
1004 sa2->sadb_x_sa2_reserved2 = 0;
1005 sa2->sadb_x_sa2_sequence = 0;
1006 sa2->sadb_x_sa2_reqid = x->props.reqid;
1007
1008 if (natt && natt->encap_type) {
1009 struct sadb_x_nat_t_type *n_type;
1010 struct sadb_x_nat_t_port *n_port;
1011
1012 /* type */
1013 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1014 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1015 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1016 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1017 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1018 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1019 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1020
1021 /* source port */
1022 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1023 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1024 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1026 n_port->sadb_x_nat_t_port_reserved = 0;
1027
1028 /* dest port */
1029 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1030 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1031 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1032 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1033 n_port->sadb_x_nat_t_port_reserved = 0;
1034 }
1035
1036 /* security context */
1037 if (xfrm_ctx) {
1038 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1039 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1040 sec_ctx->sadb_x_sec_len =
1041 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1042 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1043 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1044 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1045 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1046 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1047 xfrm_ctx->ctx_len);
1048 }
1049
1050 return skb;
1051 }
1052
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1055 {
1056 struct sk_buff *skb;
1057
1058 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1059
1060 return skb;
1061 }
1062
1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1064 int hsc)
1065 {
1066 return __pfkey_xfrm_state2msg(x, 0, hsc);
1067 }
1068
1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1070 struct sadb_msg *hdr,
1071 void **ext_hdrs)
1072 {
1073 struct xfrm_state *x;
1074 struct sadb_lifetime *lifetime;
1075 struct sadb_sa *sa;
1076 struct sadb_key *key;
1077 struct sadb_x_sec_ctx *sec_ctx;
1078 uint16_t proto;
1079 int err;
1080
1081
1082 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1083 if (!sa ||
1084 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1085 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1086 return ERR_PTR(-EINVAL);
1087 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1088 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1089 return ERR_PTR(-EINVAL);
1090 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1091 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1092 return ERR_PTR(-EINVAL);
1093 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1094 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1095 return ERR_PTR(-EINVAL);
1096
1097 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1098 if (proto == 0)
1099 return ERR_PTR(-EINVAL);
1100
1101 /* default error is no buffer space */
1102 err = -ENOBUFS;
1103
1104 /* RFC2367:
1105
1106 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1107 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1108 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1109 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1110 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1111 not true.
1112
1113 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1114 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1115 */
1116 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1117 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1118 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1119 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1120 return ERR_PTR(-EINVAL);
1121 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1122 if (key != NULL &&
1123 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1124 ((key->sadb_key_bits+7) / 8 == 0 ||
1125 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1126 return ERR_PTR(-EINVAL);
1127 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1128 if (key != NULL &&
1129 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1130 ((key->sadb_key_bits+7) / 8 == 0 ||
1131 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1132 return ERR_PTR(-EINVAL);
1133
1134 x = xfrm_state_alloc(net);
1135 if (x == NULL)
1136 return ERR_PTR(-ENOBUFS);
1137
1138 x->id.proto = proto;
1139 x->id.spi = sa->sadb_sa_spi;
1140 x->props.replay_window = sa->sadb_sa_replay;
1141 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1142 x->props.flags |= XFRM_STATE_NOECN;
1143 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1144 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1145 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1146 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1147
1148 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1149 if (lifetime != NULL) {
1150 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1151 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1152 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1153 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1154 }
1155 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1156 if (lifetime != NULL) {
1157 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1158 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1159 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1160 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1161 }
1162
1163 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1164 if (sec_ctx != NULL) {
1165 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1166
1167 if (!uctx)
1168 goto out;
1169
1170 err = security_xfrm_state_alloc(x, uctx);
1171 kfree(uctx);
1172
1173 if (err)
1174 goto out;
1175 }
1176
1177 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1178 if (sa->sadb_sa_auth) {
1179 int keysize = 0;
1180 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1181 if (!a) {
1182 err = -ENOSYS;
1183 goto out;
1184 }
1185 if (key)
1186 keysize = (key->sadb_key_bits + 7) / 8;
1187 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1188 if (!x->aalg)
1189 goto out;
1190 strcpy(x->aalg->alg_name, a->name);
1191 x->aalg->alg_key_len = 0;
1192 if (key) {
1193 x->aalg->alg_key_len = key->sadb_key_bits;
1194 memcpy(x->aalg->alg_key, key+1, keysize);
1195 }
1196 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1197 x->props.aalgo = sa->sadb_sa_auth;
1198 /* x->algo.flags = sa->sadb_sa_flags; */
1199 }
1200 if (sa->sadb_sa_encrypt) {
1201 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1202 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1203 if (!a) {
1204 err = -ENOSYS;
1205 goto out;
1206 }
1207 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1208 if (!x->calg)
1209 goto out;
1210 strcpy(x->calg->alg_name, a->name);
1211 x->props.calgo = sa->sadb_sa_encrypt;
1212 } else {
1213 int keysize = 0;
1214 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1215 if (!a) {
1216 err = -ENOSYS;
1217 goto out;
1218 }
1219 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1220 if (key)
1221 keysize = (key->sadb_key_bits + 7) / 8;
1222 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1223 if (!x->ealg)
1224 goto out;
1225 strcpy(x->ealg->alg_name, a->name);
1226 x->ealg->alg_key_len = 0;
1227 if (key) {
1228 x->ealg->alg_key_len = key->sadb_key_bits;
1229 memcpy(x->ealg->alg_key, key+1, keysize);
1230 }
1231 x->props.ealgo = sa->sadb_sa_encrypt;
1232 }
1233 }
1234 /* x->algo.flags = sa->sadb_sa_flags; */
1235
1236 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1237 &x->props.saddr);
1238 if (!x->props.family) {
1239 err = -EAFNOSUPPORT;
1240 goto out;
1241 }
1242 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1243 &x->id.daddr);
1244
1245 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1246 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1247 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1248 if (mode < 0) {
1249 err = -EINVAL;
1250 goto out;
1251 }
1252 x->props.mode = mode;
1253 x->props.reqid = sa2->sadb_x_sa2_reqid;
1254 }
1255
1256 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1257 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1258
1259 /* Nobody uses this, but we try. */
1260 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1261 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1262 }
1263
1264 if (!x->sel.family)
1265 x->sel.family = x->props.family;
1266
1267 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1268 struct sadb_x_nat_t_type* n_type;
1269 struct xfrm_encap_tmpl *natt;
1270
1271 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1272 if (!x->encap)
1273 goto out;
1274
1275 natt = x->encap;
1276 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1277 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1278
1279 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1280 struct sadb_x_nat_t_port* n_port =
1281 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1282 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1283 }
1284 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1285 struct sadb_x_nat_t_port* n_port =
1286 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1287 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1288 }
1289 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1290 }
1291
1292 err = xfrm_init_state(x);
1293 if (err)
1294 goto out;
1295
1296 x->km.seq = hdr->sadb_msg_seq;
1297 return x;
1298
1299 out:
1300 x->km.state = XFRM_STATE_DEAD;
1301 xfrm_state_put(x);
1302 return ERR_PTR(err);
1303 }
1304
1305 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1306 {
1307 return -EOPNOTSUPP;
1308 }
1309
1310 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1311 {
1312 struct net *net = sock_net(sk);
1313 struct sk_buff *resp_skb;
1314 struct sadb_x_sa2 *sa2;
1315 struct sadb_address *saddr, *daddr;
1316 struct sadb_msg *out_hdr;
1317 struct sadb_spirange *range;
1318 struct xfrm_state *x = NULL;
1319 int mode;
1320 int err;
1321 u32 min_spi, max_spi;
1322 u32 reqid;
1323 u8 proto;
1324 unsigned short family;
1325 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1326
1327 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1328 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1329 return -EINVAL;
1330
1331 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1332 if (proto == 0)
1333 return -EINVAL;
1334
1335 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1336 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1337 if (mode < 0)
1338 return -EINVAL;
1339 reqid = sa2->sadb_x_sa2_reqid;
1340 } else {
1341 mode = 0;
1342 reqid = 0;
1343 }
1344
1345 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1346 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1347
1348 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1349 switch (family) {
1350 case AF_INET:
1351 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1352 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1353 break;
1354 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1355 case AF_INET6:
1356 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1357 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1358 break;
1359 #endif
1360 }
1361
1362 if (hdr->sadb_msg_seq) {
1363 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq);
1364 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1365 xfrm_state_put(x);
1366 x = NULL;
1367 }
1368 }
1369
1370 if (!x)
1371 x = xfrm_find_acq(net, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1372
1373 if (x == NULL)
1374 return -ENOENT;
1375
1376 min_spi = 0x100;
1377 max_spi = 0x0fffffff;
1378
1379 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1380 if (range) {
1381 min_spi = range->sadb_spirange_min;
1382 max_spi = range->sadb_spirange_max;
1383 }
1384
1385 err = xfrm_alloc_spi(x, min_spi, max_spi);
1386 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1387
1388 if (IS_ERR(resp_skb)) {
1389 xfrm_state_put(x);
1390 return PTR_ERR(resp_skb);
1391 }
1392
1393 out_hdr = (struct sadb_msg *) resp_skb->data;
1394 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1395 out_hdr->sadb_msg_type = SADB_GETSPI;
1396 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1397 out_hdr->sadb_msg_errno = 0;
1398 out_hdr->sadb_msg_reserved = 0;
1399 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1400 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1401
1402 xfrm_state_put(x);
1403
1404 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1405
1406 return 0;
1407 }
1408
1409 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1410 {
1411 struct net *net = sock_net(sk);
1412 struct xfrm_state *x;
1413
1414 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1415 return -EOPNOTSUPP;
1416
1417 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1418 return 0;
1419
1420 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq);
1421 if (x == NULL)
1422 return 0;
1423
1424 spin_lock_bh(&x->lock);
1425 if (x->km.state == XFRM_STATE_ACQ) {
1426 x->km.state = XFRM_STATE_ERROR;
1427 wake_up(&net->xfrm.km_waitq);
1428 }
1429 spin_unlock_bh(&x->lock);
1430 xfrm_state_put(x);
1431 return 0;
1432 }
1433
1434 static inline int event2poltype(int event)
1435 {
1436 switch (event) {
1437 case XFRM_MSG_DELPOLICY:
1438 return SADB_X_SPDDELETE;
1439 case XFRM_MSG_NEWPOLICY:
1440 return SADB_X_SPDADD;
1441 case XFRM_MSG_UPDPOLICY:
1442 return SADB_X_SPDUPDATE;
1443 case XFRM_MSG_POLEXPIRE:
1444 // return SADB_X_SPDEXPIRE;
1445 default:
1446 printk("pfkey: Unknown policy event %d\n", event);
1447 break;
1448 }
1449
1450 return 0;
1451 }
1452
1453 static inline int event2keytype(int event)
1454 {
1455 switch (event) {
1456 case XFRM_MSG_DELSA:
1457 return SADB_DELETE;
1458 case XFRM_MSG_NEWSA:
1459 return SADB_ADD;
1460 case XFRM_MSG_UPDSA:
1461 return SADB_UPDATE;
1462 case XFRM_MSG_EXPIRE:
1463 return SADB_EXPIRE;
1464 default:
1465 printk("pfkey: Unknown SA event %d\n", event);
1466 break;
1467 }
1468
1469 return 0;
1470 }
1471
1472 /* ADD/UPD/DEL */
1473 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1474 {
1475 struct sk_buff *skb;
1476 struct sadb_msg *hdr;
1477
1478 skb = pfkey_xfrm_state2msg(x);
1479
1480 if (IS_ERR(skb))
1481 return PTR_ERR(skb);
1482
1483 hdr = (struct sadb_msg *) skb->data;
1484 hdr->sadb_msg_version = PF_KEY_V2;
1485 hdr->sadb_msg_type = event2keytype(c->event);
1486 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1487 hdr->sadb_msg_errno = 0;
1488 hdr->sadb_msg_reserved = 0;
1489 hdr->sadb_msg_seq = c->seq;
1490 hdr->sadb_msg_pid = c->pid;
1491
1492 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1493
1494 return 0;
1495 }
1496
1497 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1498 {
1499 struct net *net = sock_net(sk);
1500 struct xfrm_state *x;
1501 int err;
1502 struct km_event c;
1503
1504 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1505 if (IS_ERR(x))
1506 return PTR_ERR(x);
1507
1508 xfrm_state_hold(x);
1509 if (hdr->sadb_msg_type == SADB_ADD)
1510 err = xfrm_state_add(x);
1511 else
1512 err = xfrm_state_update(x);
1513
1514 xfrm_audit_state_add(x, err ? 0 : 1,
1515 audit_get_loginuid(current),
1516 audit_get_sessionid(current), 0);
1517
1518 if (err < 0) {
1519 x->km.state = XFRM_STATE_DEAD;
1520 __xfrm_state_put(x);
1521 goto out;
1522 }
1523
1524 if (hdr->sadb_msg_type == SADB_ADD)
1525 c.event = XFRM_MSG_NEWSA;
1526 else
1527 c.event = XFRM_MSG_UPDSA;
1528 c.seq = hdr->sadb_msg_seq;
1529 c.pid = hdr->sadb_msg_pid;
1530 km_state_notify(x, &c);
1531 out:
1532 xfrm_state_put(x);
1533 return err;
1534 }
1535
1536 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1537 {
1538 struct net *net = sock_net(sk);
1539 struct xfrm_state *x;
1540 struct km_event c;
1541 int err;
1542
1543 if (!ext_hdrs[SADB_EXT_SA-1] ||
1544 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1545 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1546 return -EINVAL;
1547
1548 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1549 if (x == NULL)
1550 return -ESRCH;
1551
1552 if ((err = security_xfrm_state_delete(x)))
1553 goto out;
1554
1555 if (xfrm_state_kern(x)) {
1556 err = -EPERM;
1557 goto out;
1558 }
1559
1560 err = xfrm_state_delete(x);
1561
1562 if (err < 0)
1563 goto out;
1564
1565 c.seq = hdr->sadb_msg_seq;
1566 c.pid = hdr->sadb_msg_pid;
1567 c.event = XFRM_MSG_DELSA;
1568 km_state_notify(x, &c);
1569 out:
1570 xfrm_audit_state_delete(x, err ? 0 : 1,
1571 audit_get_loginuid(current),
1572 audit_get_sessionid(current), 0);
1573 xfrm_state_put(x);
1574
1575 return err;
1576 }
1577
1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1579 {
1580 struct net *net = sock_net(sk);
1581 __u8 proto;
1582 struct sk_buff *out_skb;
1583 struct sadb_msg *out_hdr;
1584 struct xfrm_state *x;
1585
1586 if (!ext_hdrs[SADB_EXT_SA-1] ||
1587 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1588 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1589 return -EINVAL;
1590
1591 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1592 if (x == NULL)
1593 return -ESRCH;
1594
1595 out_skb = pfkey_xfrm_state2msg(x);
1596 proto = x->id.proto;
1597 xfrm_state_put(x);
1598 if (IS_ERR(out_skb))
1599 return PTR_ERR(out_skb);
1600
1601 out_hdr = (struct sadb_msg *) out_skb->data;
1602 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1603 out_hdr->sadb_msg_type = SADB_GET;
1604 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1605 out_hdr->sadb_msg_errno = 0;
1606 out_hdr->sadb_msg_reserved = 0;
1607 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1608 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1609 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1610
1611 return 0;
1612 }
1613
1614 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1615 gfp_t allocation)
1616 {
1617 struct sk_buff *skb;
1618 struct sadb_msg *hdr;
1619 int len, auth_len, enc_len, i;
1620
1621 auth_len = xfrm_count_auth_supported();
1622 if (auth_len) {
1623 auth_len *= sizeof(struct sadb_alg);
1624 auth_len += sizeof(struct sadb_supported);
1625 }
1626
1627 enc_len = xfrm_count_enc_supported();
1628 if (enc_len) {
1629 enc_len *= sizeof(struct sadb_alg);
1630 enc_len += sizeof(struct sadb_supported);
1631 }
1632
1633 len = enc_len + auth_len + sizeof(struct sadb_msg);
1634
1635 skb = alloc_skb(len + 16, allocation);
1636 if (!skb)
1637 goto out_put_algs;
1638
1639 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1640 pfkey_hdr_dup(hdr, orig);
1641 hdr->sadb_msg_errno = 0;
1642 hdr->sadb_msg_len = len / sizeof(uint64_t);
1643
1644 if (auth_len) {
1645 struct sadb_supported *sp;
1646 struct sadb_alg *ap;
1647
1648 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1649 ap = (struct sadb_alg *) (sp + 1);
1650
1651 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1652 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1653
1654 for (i = 0; ; i++) {
1655 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1656 if (!aalg)
1657 break;
1658 if (aalg->available)
1659 *ap++ = aalg->desc;
1660 }
1661 }
1662
1663 if (enc_len) {
1664 struct sadb_supported *sp;
1665 struct sadb_alg *ap;
1666
1667 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1668 ap = (struct sadb_alg *) (sp + 1);
1669
1670 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1671 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1672
1673 for (i = 0; ; i++) {
1674 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1675 if (!ealg)
1676 break;
1677 if (ealg->available)
1678 *ap++ = ealg->desc;
1679 }
1680 }
1681
1682 out_put_algs:
1683 return skb;
1684 }
1685
1686 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1687 {
1688 struct pfkey_sock *pfk = pfkey_sk(sk);
1689 struct sk_buff *supp_skb;
1690
1691 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1692 return -EINVAL;
1693
1694 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1695 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1696 return -EEXIST;
1697 pfk->registered |= (1<<hdr->sadb_msg_satype);
1698 }
1699
1700 xfrm_probe_algs();
1701
1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1703 if (!supp_skb) {
1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1705 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1706
1707 return -ENOBUFS;
1708 }
1709
1710 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1711
1712 return 0;
1713 }
1714
1715 static int unicast_flush_resp(struct sock *sk, struct sadb_msg *ihdr)
1716 {
1717 struct sk_buff *skb;
1718 struct sadb_msg *hdr;
1719
1720 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1721 if (!skb)
1722 return -ENOBUFS;
1723
1724 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1725 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1726 hdr->sadb_msg_errno = (uint8_t) 0;
1727 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1728
1729 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1730 }
1731
1732 static int key_notify_sa_flush(struct km_event *c)
1733 {
1734 struct sk_buff *skb;
1735 struct sadb_msg *hdr;
1736
1737 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1738 if (!skb)
1739 return -ENOBUFS;
1740 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1741 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1742 hdr->sadb_msg_type = SADB_FLUSH;
1743 hdr->sadb_msg_seq = c->seq;
1744 hdr->sadb_msg_pid = c->pid;
1745 hdr->sadb_msg_version = PF_KEY_V2;
1746 hdr->sadb_msg_errno = (uint8_t) 0;
1747 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1748
1749 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1750
1751 return 0;
1752 }
1753
1754 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1755 {
1756 struct net *net = sock_net(sk);
1757 unsigned proto;
1758 struct km_event c;
1759 struct xfrm_audit audit_info;
1760 int err, err2;
1761
1762 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1763 if (proto == 0)
1764 return -EINVAL;
1765
1766 audit_info.loginuid = audit_get_loginuid(current);
1767 audit_info.sessionid = audit_get_sessionid(current);
1768 audit_info.secid = 0;
1769 err = xfrm_state_flush(net, proto, &audit_info);
1770 err2 = unicast_flush_resp(sk, hdr);
1771 if (err || err2) {
1772 if (err == -ESRCH) /* empty table - go quietly */
1773 err = 0;
1774 return err ? err : err2;
1775 }
1776
1777 c.data.proto = proto;
1778 c.seq = hdr->sadb_msg_seq;
1779 c.pid = hdr->sadb_msg_pid;
1780 c.event = XFRM_MSG_FLUSHSA;
1781 c.net = net;
1782 km_state_notify(NULL, &c);
1783
1784 return 0;
1785 }
1786
1787 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1788 {
1789 struct pfkey_sock *pfk = ptr;
1790 struct sk_buff *out_skb;
1791 struct sadb_msg *out_hdr;
1792
1793 if (!pfkey_can_dump(&pfk->sk))
1794 return -ENOBUFS;
1795
1796 out_skb = pfkey_xfrm_state2msg(x);
1797 if (IS_ERR(out_skb))
1798 return PTR_ERR(out_skb);
1799
1800 out_hdr = (struct sadb_msg *) out_skb->data;
1801 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1802 out_hdr->sadb_msg_type = SADB_DUMP;
1803 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1804 out_hdr->sadb_msg_errno = 0;
1805 out_hdr->sadb_msg_reserved = 0;
1806 out_hdr->sadb_msg_seq = count + 1;
1807 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1808
1809 if (pfk->dump.skb)
1810 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1811 &pfk->sk, sock_net(&pfk->sk));
1812 pfk->dump.skb = out_skb;
1813
1814 return 0;
1815 }
1816
1817 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1818 {
1819 struct net *net = sock_net(&pfk->sk);
1820 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1821 }
1822
1823 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1824 {
1825 xfrm_state_walk_done(&pfk->dump.u.state);
1826 }
1827
1828 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1829 {
1830 u8 proto;
1831 struct pfkey_sock *pfk = pfkey_sk(sk);
1832
1833 if (pfk->dump.dump != NULL)
1834 return -EBUSY;
1835
1836 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1837 if (proto == 0)
1838 return -EINVAL;
1839
1840 pfk->dump.msg_version = hdr->sadb_msg_version;
1841 pfk->dump.msg_pid = hdr->sadb_msg_pid;
1842 pfk->dump.dump = pfkey_dump_sa;
1843 pfk->dump.done = pfkey_dump_sa_done;
1844 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1845
1846 return pfkey_do_dump(pfk);
1847 }
1848
1849 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1850 {
1851 struct pfkey_sock *pfk = pfkey_sk(sk);
1852 int satype = hdr->sadb_msg_satype;
1853
1854 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1855 /* XXX we mangle packet... */
1856 hdr->sadb_msg_errno = 0;
1857 if (satype != 0 && satype != 1)
1858 return -EINVAL;
1859 pfk->promisc = satype;
1860 }
1861 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1862 return 0;
1863 }
1864
1865 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1866 {
1867 int i;
1868 u32 reqid = *(u32*)ptr;
1869
1870 for (i=0; i<xp->xfrm_nr; i++) {
1871 if (xp->xfrm_vec[i].reqid == reqid)
1872 return -EEXIST;
1873 }
1874 return 0;
1875 }
1876
1877 static u32 gen_reqid(struct net *net)
1878 {
1879 struct xfrm_policy_walk walk;
1880 u32 start;
1881 int rc;
1882 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1883
1884 start = reqid;
1885 do {
1886 ++reqid;
1887 if (reqid == 0)
1888 reqid = IPSEC_MANUAL_REQID_MAX+1;
1889 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1890 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1891 xfrm_policy_walk_done(&walk);
1892 if (rc != -EEXIST)
1893 return reqid;
1894 } while (reqid != start);
1895 return 0;
1896 }
1897
1898 static int
1899 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1900 {
1901 struct net *net = xp_net(xp);
1902 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1903 int mode;
1904
1905 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1906 return -ELOOP;
1907
1908 if (rq->sadb_x_ipsecrequest_mode == 0)
1909 return -EINVAL;
1910
1911 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1912 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1913 return -EINVAL;
1914 t->mode = mode;
1915 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1916 t->optional = 1;
1917 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1918 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1919 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1920 t->reqid = 0;
1921 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1922 return -ENOBUFS;
1923 }
1924
1925 /* addresses present only in tunnel mode */
1926 if (t->mode == XFRM_MODE_TUNNEL) {
1927 u8 *sa = (u8 *) (rq + 1);
1928 int family, socklen;
1929
1930 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1931 &t->saddr);
1932 if (!family)
1933 return -EINVAL;
1934
1935 socklen = pfkey_sockaddr_len(family);
1936 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1937 &t->id.daddr) != family)
1938 return -EINVAL;
1939 t->encap_family = family;
1940 } else
1941 t->encap_family = xp->family;
1942
1943 /* No way to set this via kame pfkey */
1944 t->allalgs = 1;
1945 xp->xfrm_nr++;
1946 return 0;
1947 }
1948
1949 static int
1950 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1951 {
1952 int err;
1953 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1954 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1955
1956 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1957 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1958 return err;
1959 len -= rq->sadb_x_ipsecrequest_len;
1960 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1961 }
1962 return 0;
1963 }
1964
1965 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1966 {
1967 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1968
1969 if (xfrm_ctx) {
1970 int len = sizeof(struct sadb_x_sec_ctx);
1971 len += xfrm_ctx->ctx_len;
1972 return PFKEY_ALIGN8(len);
1973 }
1974 return 0;
1975 }
1976
1977 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1978 {
1979 struct xfrm_tmpl *t;
1980 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1981 int socklen = 0;
1982 int i;
1983
1984 for (i=0; i<xp->xfrm_nr; i++) {
1985 t = xp->xfrm_vec + i;
1986 socklen += pfkey_sockaddr_len(t->encap_family);
1987 }
1988
1989 return sizeof(struct sadb_msg) +
1990 (sizeof(struct sadb_lifetime) * 3) +
1991 (sizeof(struct sadb_address) * 2) +
1992 (sockaddr_size * 2) +
1993 sizeof(struct sadb_x_policy) +
1994 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1995 (socklen * 2) +
1996 pfkey_xfrm_policy2sec_ctx_size(xp);
1997 }
1998
1999 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
2000 {
2001 struct sk_buff *skb;
2002 int size;
2003
2004 size = pfkey_xfrm_policy2msg_size(xp);
2005
2006 skb = alloc_skb(size + 16, GFP_ATOMIC);
2007 if (skb == NULL)
2008 return ERR_PTR(-ENOBUFS);
2009
2010 return skb;
2011 }
2012
2013 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
2014 {
2015 struct sadb_msg *hdr;
2016 struct sadb_address *addr;
2017 struct sadb_lifetime *lifetime;
2018 struct sadb_x_policy *pol;
2019 struct sadb_x_sec_ctx *sec_ctx;
2020 struct xfrm_sec_ctx *xfrm_ctx;
2021 int i;
2022 int size;
2023 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2024 int socklen = pfkey_sockaddr_len(xp->family);
2025
2026 size = pfkey_xfrm_policy2msg_size(xp);
2027
2028 /* call should fill header later */
2029 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2030 memset(hdr, 0, size); /* XXX do we need this ? */
2031
2032 /* src address */
2033 addr = (struct sadb_address*) skb_put(skb,
2034 sizeof(struct sadb_address)+sockaddr_size);
2035 addr->sadb_address_len =
2036 (sizeof(struct sadb_address)+sockaddr_size)/
2037 sizeof(uint64_t);
2038 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2039 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2040 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2041 addr->sadb_address_reserved = 0;
2042 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2043 xp->selector.sport,
2044 (struct sockaddr *) (addr + 1),
2045 xp->family))
2046 BUG();
2047
2048 /* dst address */
2049 addr = (struct sadb_address*) skb_put(skb,
2050 sizeof(struct sadb_address)+sockaddr_size);
2051 addr->sadb_address_len =
2052 (sizeof(struct sadb_address)+sockaddr_size)/
2053 sizeof(uint64_t);
2054 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2055 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2056 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2057 addr->sadb_address_reserved = 0;
2058
2059 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2060 (struct sockaddr *) (addr + 1),
2061 xp->family);
2062
2063 /* hard time */
2064 lifetime = (struct sadb_lifetime *) skb_put(skb,
2065 sizeof(struct sadb_lifetime));
2066 lifetime->sadb_lifetime_len =
2067 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2068 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2069 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2070 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2071 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2072 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2073 /* soft time */
2074 lifetime = (struct sadb_lifetime *) skb_put(skb,
2075 sizeof(struct sadb_lifetime));
2076 lifetime->sadb_lifetime_len =
2077 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2078 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2079 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2080 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2081 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2082 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2083 /* current time */
2084 lifetime = (struct sadb_lifetime *) skb_put(skb,
2085 sizeof(struct sadb_lifetime));
2086 lifetime->sadb_lifetime_len =
2087 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2088 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2089 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2090 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2091 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2092 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2093
2094 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2095 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2096 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2097 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2098 if (xp->action == XFRM_POLICY_ALLOW) {
2099 if (xp->xfrm_nr)
2100 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2101 else
2102 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2103 }
2104 pol->sadb_x_policy_dir = dir+1;
2105 pol->sadb_x_policy_id = xp->index;
2106 pol->sadb_x_policy_priority = xp->priority;
2107
2108 for (i=0; i<xp->xfrm_nr; i++) {
2109 struct sadb_x_ipsecrequest *rq;
2110 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2111 int req_size;
2112 int mode;
2113
2114 req_size = sizeof(struct sadb_x_ipsecrequest);
2115 if (t->mode == XFRM_MODE_TUNNEL) {
2116 socklen = pfkey_sockaddr_len(t->encap_family);
2117 req_size += socklen * 2;
2118 } else {
2119 size -= 2*socklen;
2120 }
2121 rq = (void*)skb_put(skb, req_size);
2122 pol->sadb_x_policy_len += req_size/8;
2123 memset(rq, 0, sizeof(*rq));
2124 rq->sadb_x_ipsecrequest_len = req_size;
2125 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2126 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2127 return -EINVAL;
2128 rq->sadb_x_ipsecrequest_mode = mode;
2129 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2130 if (t->reqid)
2131 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2132 if (t->optional)
2133 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2134 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2135
2136 if (t->mode == XFRM_MODE_TUNNEL) {
2137 u8 *sa = (void *)(rq + 1);
2138 pfkey_sockaddr_fill(&t->saddr, 0,
2139 (struct sockaddr *)sa,
2140 t->encap_family);
2141 pfkey_sockaddr_fill(&t->id.daddr, 0,
2142 (struct sockaddr *) (sa + socklen),
2143 t->encap_family);
2144 }
2145 }
2146
2147 /* security context */
2148 if ((xfrm_ctx = xp->security)) {
2149 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2150
2151 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2152 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2153 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2154 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2155 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2156 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2157 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2158 xfrm_ctx->ctx_len);
2159 }
2160
2161 hdr->sadb_msg_len = size / sizeof(uint64_t);
2162 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2163
2164 return 0;
2165 }
2166
2167 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2168 {
2169 struct sk_buff *out_skb;
2170 struct sadb_msg *out_hdr;
2171 int err;
2172
2173 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2174 if (IS_ERR(out_skb)) {
2175 err = PTR_ERR(out_skb);
2176 goto out;
2177 }
2178 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2179 if (err < 0)
2180 return err;
2181
2182 out_hdr = (struct sadb_msg *) out_skb->data;
2183 out_hdr->sadb_msg_version = PF_KEY_V2;
2184
2185 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2186 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2187 else
2188 out_hdr->sadb_msg_type = event2poltype(c->event);
2189 out_hdr->sadb_msg_errno = 0;
2190 out_hdr->sadb_msg_seq = c->seq;
2191 out_hdr->sadb_msg_pid = c->pid;
2192 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2193 out:
2194 return 0;
2195
2196 }
2197
2198 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2199 {
2200 struct net *net = sock_net(sk);
2201 int err = 0;
2202 struct sadb_lifetime *lifetime;
2203 struct sadb_address *sa;
2204 struct sadb_x_policy *pol;
2205 struct xfrm_policy *xp;
2206 struct km_event c;
2207 struct sadb_x_sec_ctx *sec_ctx;
2208
2209 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2210 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2211 !ext_hdrs[SADB_X_EXT_POLICY-1])
2212 return -EINVAL;
2213
2214 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2215 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2216 return -EINVAL;
2217 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2218 return -EINVAL;
2219
2220 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2221 if (xp == NULL)
2222 return -ENOBUFS;
2223
2224 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2225 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2226 xp->priority = pol->sadb_x_policy_priority;
2227
2228 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2229 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2230 if (!xp->family) {
2231 err = -EINVAL;
2232 goto out;
2233 }
2234 xp->selector.family = xp->family;
2235 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2236 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2237 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2238 if (xp->selector.sport)
2239 xp->selector.sport_mask = htons(0xffff);
2240
2241 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2242 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2243 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2244
2245 /* Amusing, we set this twice. KAME apps appear to set same value
2246 * in both addresses.
2247 */
2248 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2249
2250 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2251 if (xp->selector.dport)
2252 xp->selector.dport_mask = htons(0xffff);
2253
2254 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2255 if (sec_ctx != NULL) {
2256 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2257
2258 if (!uctx) {
2259 err = -ENOBUFS;
2260 goto out;
2261 }
2262
2263 err = security_xfrm_policy_alloc(&xp->security, uctx);
2264 kfree(uctx);
2265
2266 if (err)
2267 goto out;
2268 }
2269
2270 xp->lft.soft_byte_limit = XFRM_INF;
2271 xp->lft.hard_byte_limit = XFRM_INF;
2272 xp->lft.soft_packet_limit = XFRM_INF;
2273 xp->lft.hard_packet_limit = XFRM_INF;
2274 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2275 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2276 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2277 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2278 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2279 }
2280 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2281 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2282 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2283 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2284 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2285 }
2286 xp->xfrm_nr = 0;
2287 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2288 (err = parse_ipsecrequests(xp, pol)) < 0)
2289 goto out;
2290
2291 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2292 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2293
2294 xfrm_audit_policy_add(xp, err ? 0 : 1,
2295 audit_get_loginuid(current),
2296 audit_get_sessionid(current), 0);
2297
2298 if (err)
2299 goto out;
2300
2301 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2302 c.event = XFRM_MSG_UPDPOLICY;
2303 else
2304 c.event = XFRM_MSG_NEWPOLICY;
2305
2306 c.seq = hdr->sadb_msg_seq;
2307 c.pid = hdr->sadb_msg_pid;
2308
2309 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2310 xfrm_pol_put(xp);
2311 return 0;
2312
2313 out:
2314 xp->walk.dead = 1;
2315 xfrm_policy_destroy(xp);
2316 return err;
2317 }
2318
2319 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2320 {
2321 struct net *net = sock_net(sk);
2322 int err;
2323 struct sadb_address *sa;
2324 struct sadb_x_policy *pol;
2325 struct xfrm_policy *xp;
2326 struct xfrm_selector sel;
2327 struct km_event c;
2328 struct sadb_x_sec_ctx *sec_ctx;
2329 struct xfrm_sec_ctx *pol_ctx = NULL;
2330
2331 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2332 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2333 !ext_hdrs[SADB_X_EXT_POLICY-1])
2334 return -EINVAL;
2335
2336 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2337 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2338 return -EINVAL;
2339
2340 memset(&sel, 0, sizeof(sel));
2341
2342 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2343 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2344 sel.prefixlen_s = sa->sadb_address_prefixlen;
2345 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2346 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2347 if (sel.sport)
2348 sel.sport_mask = htons(0xffff);
2349
2350 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2351 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2352 sel.prefixlen_d = sa->sadb_address_prefixlen;
2353 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2354 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2355 if (sel.dport)
2356 sel.dport_mask = htons(0xffff);
2357
2358 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2359 if (sec_ctx != NULL) {
2360 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2361
2362 if (!uctx)
2363 return -ENOMEM;
2364
2365 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2366 kfree(uctx);
2367 if (err)
2368 return err;
2369 }
2370
2371 xp = xfrm_policy_bysel_ctx(net, XFRM_POLICY_TYPE_MAIN,
2372 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2373 1, &err);
2374 security_xfrm_policy_free(pol_ctx);
2375 if (xp == NULL)
2376 return -ENOENT;
2377
2378 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2379 audit_get_loginuid(current),
2380 audit_get_sessionid(current), 0);
2381
2382 if (err)
2383 goto out;
2384
2385 c.seq = hdr->sadb_msg_seq;
2386 c.pid = hdr->sadb_msg_pid;
2387 c.data.byid = 0;
2388 c.event = XFRM_MSG_DELPOLICY;
2389 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2390
2391 out:
2392 xfrm_pol_put(xp);
2393 return err;
2394 }
2395
2396 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2397 {
2398 int err;
2399 struct sk_buff *out_skb;
2400 struct sadb_msg *out_hdr;
2401 err = 0;
2402
2403 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2404 if (IS_ERR(out_skb)) {
2405 err = PTR_ERR(out_skb);
2406 goto out;
2407 }
2408 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2409 if (err < 0)
2410 goto out;
2411
2412 out_hdr = (struct sadb_msg *) out_skb->data;
2413 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2414 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2415 out_hdr->sadb_msg_satype = 0;
2416 out_hdr->sadb_msg_errno = 0;
2417 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2418 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2419 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2420 err = 0;
2421
2422 out:
2423 return err;
2424 }
2425
2426 #ifdef CONFIG_NET_KEY_MIGRATE
2427 static int pfkey_sockaddr_pair_size(sa_family_t family)
2428 {
2429 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2430 }
2431
2432 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2433 xfrm_address_t *saddr, xfrm_address_t *daddr,
2434 u16 *family)
2435 {
2436 int af, socklen;
2437
2438 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2439 return -EINVAL;
2440
2441 af = pfkey_sockaddr_extract(sa, saddr);
2442 if (!af)
2443 return -EINVAL;
2444
2445 socklen = pfkey_sockaddr_len(af);
2446 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2447 daddr) != af)
2448 return -EINVAL;
2449
2450 *family = af;
2451 return 0;
2452 }
2453
2454 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2455 struct xfrm_migrate *m)
2456 {
2457 int err;
2458 struct sadb_x_ipsecrequest *rq2;
2459 int mode;
2460
2461 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2462 len < rq1->sadb_x_ipsecrequest_len)
2463 return -EINVAL;
2464
2465 /* old endoints */
2466 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2467 rq1->sadb_x_ipsecrequest_len,
2468 &m->old_saddr, &m->old_daddr,
2469 &m->old_family);
2470 if (err)
2471 return err;
2472
2473 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2474 len -= rq1->sadb_x_ipsecrequest_len;
2475
2476 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2477 len < rq2->sadb_x_ipsecrequest_len)
2478 return -EINVAL;
2479
2480 /* new endpoints */
2481 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2482 rq2->sadb_x_ipsecrequest_len,
2483 &m->new_saddr, &m->new_daddr,
2484 &m->new_family);
2485 if (err)
2486 return err;
2487
2488 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2489 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2490 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2491 return -EINVAL;
2492
2493 m->proto = rq1->sadb_x_ipsecrequest_proto;
2494 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2495 return -EINVAL;
2496 m->mode = mode;
2497 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2498
2499 return ((int)(rq1->sadb_x_ipsecrequest_len +
2500 rq2->sadb_x_ipsecrequest_len));
2501 }
2502
2503 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2504 struct sadb_msg *hdr, void **ext_hdrs)
2505 {
2506 int i, len, ret, err = -EINVAL;
2507 u8 dir;
2508 struct sadb_address *sa;
2509 struct sadb_x_kmaddress *kma;
2510 struct sadb_x_policy *pol;
2511 struct sadb_x_ipsecrequest *rq;
2512 struct xfrm_selector sel;
2513 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2514 struct xfrm_kmaddress k;
2515
2516 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2517 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2518 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2519 err = -EINVAL;
2520 goto out;
2521 }
2522
2523 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2524 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2525
2526 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2527 err = -EINVAL;
2528 goto out;
2529 }
2530
2531 if (kma) {
2532 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2533 k.reserved = kma->sadb_x_kmaddress_reserved;
2534 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2535 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2536 &k.local, &k.remote, &k.family);
2537 if (ret < 0) {
2538 err = ret;
2539 goto out;
2540 }
2541 }
2542
2543 dir = pol->sadb_x_policy_dir - 1;
2544 memset(&sel, 0, sizeof(sel));
2545
2546 /* set source address info of selector */
2547 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2548 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2549 sel.prefixlen_s = sa->sadb_address_prefixlen;
2550 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2551 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2552 if (sel.sport)
2553 sel.sport_mask = htons(0xffff);
2554
2555 /* set destination address info of selector */
2556 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2557 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2558 sel.prefixlen_d = sa->sadb_address_prefixlen;
2559 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2560 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2561 if (sel.dport)
2562 sel.dport_mask = htons(0xffff);
2563
2564 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2565
2566 /* extract ipsecrequests */
2567 i = 0;
2568 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2569
2570 while (len > 0 && i < XFRM_MAX_DEPTH) {
2571 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2572 if (ret < 0) {
2573 err = ret;
2574 goto out;
2575 } else {
2576 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2577 len -= ret;
2578 i++;
2579 }
2580 }
2581
2582 if (!i || len > 0) {
2583 err = -EINVAL;
2584 goto out;
2585 }
2586
2587 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2588 kma ? &k : NULL);
2589
2590 out:
2591 return err;
2592 }
2593 #else
2594 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2595 struct sadb_msg *hdr, void **ext_hdrs)
2596 {
2597 return -ENOPROTOOPT;
2598 }
2599 #endif
2600
2601
2602 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2603 {
2604 struct net *net = sock_net(sk);
2605 unsigned int dir;
2606 int err = 0, delete;
2607 struct sadb_x_policy *pol;
2608 struct xfrm_policy *xp;
2609 struct km_event c;
2610
2611 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2612 return -EINVAL;
2613
2614 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2615 if (dir >= XFRM_POLICY_MAX)
2616 return -EINVAL;
2617
2618 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2619 xp = xfrm_policy_byid(net, XFRM_POLICY_TYPE_MAIN, dir,
2620 pol->sadb_x_policy_id, delete, &err);
2621 if (xp == NULL)
2622 return -ENOENT;
2623
2624 if (delete) {
2625 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2626 audit_get_loginuid(current),
2627 audit_get_sessionid(current), 0);
2628
2629 if (err)
2630 goto out;
2631 c.seq = hdr->sadb_msg_seq;
2632 c.pid = hdr->sadb_msg_pid;
2633 c.data.byid = 1;
2634 c.event = XFRM_MSG_DELPOLICY;
2635 km_policy_notify(xp, dir, &c);
2636 } else {
2637 err = key_pol_get_resp(sk, xp, hdr, dir);
2638 }
2639
2640 out:
2641 xfrm_pol_put(xp);
2642 return err;
2643 }
2644
2645 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2646 {
2647 struct pfkey_sock *pfk = ptr;
2648 struct sk_buff *out_skb;
2649 struct sadb_msg *out_hdr;
2650 int err;
2651
2652 if (!pfkey_can_dump(&pfk->sk))
2653 return -ENOBUFS;
2654
2655 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2656 if (IS_ERR(out_skb))
2657 return PTR_ERR(out_skb);
2658
2659 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2660 if (err < 0)
2661 return err;
2662
2663 out_hdr = (struct sadb_msg *) out_skb->data;
2664 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2665 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2666 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2667 out_hdr->sadb_msg_errno = 0;
2668 out_hdr->sadb_msg_seq = count + 1;
2669 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2670
2671 if (pfk->dump.skb)
2672 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2673 &pfk->sk, sock_net(&pfk->sk));
2674 pfk->dump.skb = out_skb;
2675
2676 return 0;
2677 }
2678
2679 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2680 {
2681 struct net *net = sock_net(&pfk->sk);
2682 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2683 }
2684
2685 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2686 {
2687 xfrm_policy_walk_done(&pfk->dump.u.policy);
2688 }
2689
2690 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2691 {
2692 struct pfkey_sock *pfk = pfkey_sk(sk);
2693
2694 if (pfk->dump.dump != NULL)
2695 return -EBUSY;
2696
2697 pfk->dump.msg_version = hdr->sadb_msg_version;
2698 pfk->dump.msg_pid = hdr->sadb_msg_pid;
2699 pfk->dump.dump = pfkey_dump_sp;
2700 pfk->dump.done = pfkey_dump_sp_done;
2701 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2702
2703 return pfkey_do_dump(pfk);
2704 }
2705
2706 static int key_notify_policy_flush(struct km_event *c)
2707 {
2708 struct sk_buff *skb_out;
2709 struct sadb_msg *hdr;
2710
2711 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2712 if (!skb_out)
2713 return -ENOBUFS;
2714 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2715 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2716 hdr->sadb_msg_seq = c->seq;
2717 hdr->sadb_msg_pid = c->pid;
2718 hdr->sadb_msg_version = PF_KEY_V2;
2719 hdr->sadb_msg_errno = (uint8_t) 0;
2720 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2721 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2722 return 0;
2723
2724 }
2725
2726 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2727 {
2728 struct net *net = sock_net(sk);
2729 struct km_event c;
2730 struct xfrm_audit audit_info;
2731 int err, err2;
2732
2733 audit_info.loginuid = audit_get_loginuid(current);
2734 audit_info.sessionid = audit_get_sessionid(current);
2735 audit_info.secid = 0;
2736 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2737 err2 = unicast_flush_resp(sk, hdr);
2738 if (err || err2) {
2739 if (err == -ESRCH) /* empty table - old silent behavior */
2740 return 0;
2741 return err;
2742 }
2743
2744 c.data.type = XFRM_POLICY_TYPE_MAIN;
2745 c.event = XFRM_MSG_FLUSHPOLICY;
2746 c.pid = hdr->sadb_msg_pid;
2747 c.seq = hdr->sadb_msg_seq;
2748 c.net = net;
2749 km_policy_notify(NULL, 0, &c);
2750
2751 return 0;
2752 }
2753
2754 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2755 struct sadb_msg *hdr, void **ext_hdrs);
2756 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2757 [SADB_RESERVED] = pfkey_reserved,
2758 [SADB_GETSPI] = pfkey_getspi,
2759 [SADB_UPDATE] = pfkey_add,
2760 [SADB_ADD] = pfkey_add,
2761 [SADB_DELETE] = pfkey_delete,
2762 [SADB_GET] = pfkey_get,
2763 [SADB_ACQUIRE] = pfkey_acquire,
2764 [SADB_REGISTER] = pfkey_register,
2765 [SADB_EXPIRE] = NULL,
2766 [SADB_FLUSH] = pfkey_flush,
2767 [SADB_DUMP] = pfkey_dump,
2768 [SADB_X_PROMISC] = pfkey_promisc,
2769 [SADB_X_PCHANGE] = NULL,
2770 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2771 [SADB_X_SPDADD] = pfkey_spdadd,
2772 [SADB_X_SPDDELETE] = pfkey_spddelete,
2773 [SADB_X_SPDGET] = pfkey_spdget,
2774 [SADB_X_SPDACQUIRE] = NULL,
2775 [SADB_X_SPDDUMP] = pfkey_spddump,
2776 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2777 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2778 [SADB_X_SPDDELETE2] = pfkey_spdget,
2779 [SADB_X_MIGRATE] = pfkey_migrate,
2780 };
2781
2782 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2783 {
2784 void *ext_hdrs[SADB_EXT_MAX];
2785 int err;
2786
2787 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2788 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2789
2790 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2791 err = parse_exthdrs(skb, hdr, ext_hdrs);
2792 if (!err) {
2793 err = -EOPNOTSUPP;
2794 if (pfkey_funcs[hdr->sadb_msg_type])
2795 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2796 }
2797 return err;
2798 }
2799
2800 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2801 {
2802 struct sadb_msg *hdr = NULL;
2803
2804 if (skb->len < sizeof(*hdr)) {
2805 *errp = -EMSGSIZE;
2806 } else {
2807 hdr = (struct sadb_msg *) skb->data;
2808 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2809 hdr->sadb_msg_reserved != 0 ||
2810 (hdr->sadb_msg_type <= SADB_RESERVED ||
2811 hdr->sadb_msg_type > SADB_MAX)) {
2812 hdr = NULL;
2813 *errp = -EINVAL;
2814 } else if (hdr->sadb_msg_len != (skb->len /
2815 sizeof(uint64_t)) ||
2816 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2817 sizeof(uint64_t))) {
2818 hdr = NULL;
2819 *errp = -EMSGSIZE;
2820 } else {
2821 *errp = 0;
2822 }
2823 }
2824 return hdr;
2825 }
2826
2827 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2828 {
2829 unsigned int id = d->desc.sadb_alg_id;
2830
2831 if (id >= sizeof(t->aalgos) * 8)
2832 return 0;
2833
2834 return (t->aalgos >> id) & 1;
2835 }
2836
2837 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2838 {
2839 unsigned int id = d->desc.sadb_alg_id;
2840
2841 if (id >= sizeof(t->ealgos) * 8)
2842 return 0;
2843
2844 return (t->ealgos >> id) & 1;
2845 }
2846
2847 static int count_ah_combs(struct xfrm_tmpl *t)
2848 {
2849 int i, sz = 0;
2850
2851 for (i = 0; ; i++) {
2852 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2853 if (!aalg)
2854 break;
2855 if (aalg_tmpl_set(t, aalg) && aalg->available)
2856 sz += sizeof(struct sadb_comb);
2857 }
2858 return sz + sizeof(struct sadb_prop);
2859 }
2860
2861 static int count_esp_combs(struct xfrm_tmpl *t)
2862 {
2863 int i, k, sz = 0;
2864
2865 for (i = 0; ; i++) {
2866 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2867 if (!ealg)
2868 break;
2869
2870 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2871 continue;
2872
2873 for (k = 1; ; k++) {
2874 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2875 if (!aalg)
2876 break;
2877
2878 if (aalg_tmpl_set(t, aalg) && aalg->available)
2879 sz += sizeof(struct sadb_comb);
2880 }
2881 }
2882 return sz + sizeof(struct sadb_prop);
2883 }
2884
2885 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2886 {
2887 struct sadb_prop *p;
2888 int i;
2889
2890 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2891 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2892 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2893 p->sadb_prop_replay = 32;
2894 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2895
2896 for (i = 0; ; i++) {
2897 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2898 if (!aalg)
2899 break;
2900
2901 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2902 struct sadb_comb *c;
2903 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2904 memset(c, 0, sizeof(*c));
2905 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2906 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2907 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2908 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2909 c->sadb_comb_hard_addtime = 24*60*60;
2910 c->sadb_comb_soft_addtime = 20*60*60;
2911 c->sadb_comb_hard_usetime = 8*60*60;
2912 c->sadb_comb_soft_usetime = 7*60*60;
2913 }
2914 }
2915 }
2916
2917 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2918 {
2919 struct sadb_prop *p;
2920 int i, k;
2921
2922 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2923 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2924 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2925 p->sadb_prop_replay = 32;
2926 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2927
2928 for (i=0; ; i++) {
2929 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2930 if (!ealg)
2931 break;
2932
2933 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2934 continue;
2935
2936 for (k = 1; ; k++) {
2937 struct sadb_comb *c;
2938 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2939 if (!aalg)
2940 break;
2941 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2942 continue;
2943 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2944 memset(c, 0, sizeof(*c));
2945 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2946 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2947 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2948 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2949 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2950 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2951 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2952 c->sadb_comb_hard_addtime = 24*60*60;
2953 c->sadb_comb_soft_addtime = 20*60*60;
2954 c->sadb_comb_hard_usetime = 8*60*60;
2955 c->sadb_comb_soft_usetime = 7*60*60;
2956 }
2957 }
2958 }
2959
2960 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2961 {
2962 return 0;
2963 }
2964
2965 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2966 {
2967 struct sk_buff *out_skb;
2968 struct sadb_msg *out_hdr;
2969 int hard;
2970 int hsc;
2971
2972 hard = c->data.hard;
2973 if (hard)
2974 hsc = 2;
2975 else
2976 hsc = 1;
2977
2978 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2979 if (IS_ERR(out_skb))
2980 return PTR_ERR(out_skb);
2981
2982 out_hdr = (struct sadb_msg *) out_skb->data;
2983 out_hdr->sadb_msg_version = PF_KEY_V2;
2984 out_hdr->sadb_msg_type = SADB_EXPIRE;
2985 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2986 out_hdr->sadb_msg_errno = 0;
2987 out_hdr->sadb_msg_reserved = 0;
2988 out_hdr->sadb_msg_seq = 0;
2989 out_hdr->sadb_msg_pid = 0;
2990
2991 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2992 return 0;
2993 }
2994
2995 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2996 {
2997 struct net *net = x ? xs_net(x) : c->net;
2998 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2999
3000 if (atomic_read(&net_pfkey->socks_nr) == 0)
3001 return 0;
3002
3003 switch (c->event) {
3004 case XFRM_MSG_EXPIRE:
3005 return key_notify_sa_expire(x, c);
3006 case XFRM_MSG_DELSA:
3007 case XFRM_MSG_NEWSA:
3008 case XFRM_MSG_UPDSA:
3009 return key_notify_sa(x, c);
3010 case XFRM_MSG_FLUSHSA:
3011 return key_notify_sa_flush(c);
3012 case XFRM_MSG_NEWAE: /* not yet supported */
3013 break;
3014 default:
3015 printk("pfkey: Unknown SA event %d\n", c->event);
3016 break;
3017 }
3018
3019 return 0;
3020 }
3021
3022 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
3023 {
3024 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3025 return 0;
3026
3027 switch (c->event) {
3028 case XFRM_MSG_POLEXPIRE:
3029 return key_notify_policy_expire(xp, c);
3030 case XFRM_MSG_DELPOLICY:
3031 case XFRM_MSG_NEWPOLICY:
3032 case XFRM_MSG_UPDPOLICY:
3033 return key_notify_policy(xp, dir, c);
3034 case XFRM_MSG_FLUSHPOLICY:
3035 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3036 break;
3037 return key_notify_policy_flush(c);
3038 default:
3039 printk("pfkey: Unknown policy event %d\n", c->event);
3040 break;
3041 }
3042
3043 return 0;
3044 }
3045
3046 static u32 get_acqseq(void)
3047 {
3048 u32 res;
3049 static atomic_t acqseq;
3050
3051 do {
3052 res = atomic_inc_return(&acqseq);
3053 } while (!res);
3054 return res;
3055 }
3056
3057 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3058 {
3059 struct sk_buff *skb;
3060 struct sadb_msg *hdr;
3061 struct sadb_address *addr;
3062 struct sadb_x_policy *pol;
3063 int sockaddr_size;
3064 int size;
3065 struct sadb_x_sec_ctx *sec_ctx;
3066 struct xfrm_sec_ctx *xfrm_ctx;
3067 int ctx_size = 0;
3068
3069 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3070 if (!sockaddr_size)
3071 return -EINVAL;
3072
3073 size = sizeof(struct sadb_msg) +
3074 (sizeof(struct sadb_address) * 2) +
3075 (sockaddr_size * 2) +
3076 sizeof(struct sadb_x_policy);
3077
3078 if (x->id.proto == IPPROTO_AH)
3079 size += count_ah_combs(t);
3080 else if (x->id.proto == IPPROTO_ESP)
3081 size += count_esp_combs(t);
3082
3083 if ((xfrm_ctx = x->security)) {
3084 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3085 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3086 }
3087
3088 skb = alloc_skb(size + 16, GFP_ATOMIC);
3089 if (skb == NULL)
3090 return -ENOMEM;
3091
3092 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3093 hdr->sadb_msg_version = PF_KEY_V2;
3094 hdr->sadb_msg_type = SADB_ACQUIRE;
3095 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3096 hdr->sadb_msg_len = size / sizeof(uint64_t);
3097 hdr->sadb_msg_errno = 0;
3098 hdr->sadb_msg_reserved = 0;
3099 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3100 hdr->sadb_msg_pid = 0;
3101
3102 /* src address */
3103 addr = (struct sadb_address*) skb_put(skb,
3104 sizeof(struct sadb_address)+sockaddr_size);
3105 addr->sadb_address_len =
3106 (sizeof(struct sadb_address)+sockaddr_size)/
3107 sizeof(uint64_t);
3108 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3109 addr->sadb_address_proto = 0;
3110 addr->sadb_address_reserved = 0;
3111 addr->sadb_address_prefixlen =
3112 pfkey_sockaddr_fill(&x->props.saddr, 0,
3113 (struct sockaddr *) (addr + 1),
3114 x->props.family);
3115 if (!addr->sadb_address_prefixlen)
3116 BUG();
3117
3118 /* dst address */
3119 addr = (struct sadb_address*) skb_put(skb,
3120 sizeof(struct sadb_address)+sockaddr_size);
3121 addr->sadb_address_len =
3122 (sizeof(struct sadb_address)+sockaddr_size)/
3123 sizeof(uint64_t);
3124 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3125 addr->sadb_address_proto = 0;
3126 addr->sadb_address_reserved = 0;
3127 addr->sadb_address_prefixlen =
3128 pfkey_sockaddr_fill(&x->id.daddr, 0,
3129 (struct sockaddr *) (addr + 1),
3130 x->props.family);
3131 if (!addr->sadb_address_prefixlen)
3132 BUG();
3133
3134 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3135 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3136 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3137 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3138 pol->sadb_x_policy_dir = dir+1;
3139 pol->sadb_x_policy_id = xp->index;
3140
3141 /* Set sadb_comb's. */
3142 if (x->id.proto == IPPROTO_AH)
3143 dump_ah_combs(skb, t);
3144 else if (x->id.proto == IPPROTO_ESP)
3145 dump_esp_combs(skb, t);
3146
3147 /* security context */
3148 if (xfrm_ctx) {
3149 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3150 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3151 sec_ctx->sadb_x_sec_len =
3152 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3153 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3154 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3155 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3156 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3157 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3158 xfrm_ctx->ctx_len);
3159 }
3160
3161 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3162 }
3163
3164 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3165 u8 *data, int len, int *dir)
3166 {
3167 struct net *net = sock_net(sk);
3168 struct xfrm_policy *xp;
3169 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3170 struct sadb_x_sec_ctx *sec_ctx;
3171
3172 switch (sk->sk_family) {
3173 case AF_INET:
3174 if (opt != IP_IPSEC_POLICY) {
3175 *dir = -EOPNOTSUPP;
3176 return NULL;
3177 }
3178 break;
3179 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3180 case AF_INET6:
3181 if (opt != IPV6_IPSEC_POLICY) {
3182 *dir = -EOPNOTSUPP;
3183 return NULL;
3184 }
3185 break;
3186 #endif
3187 default:
3188 *dir = -EINVAL;
3189 return NULL;
3190 }
3191
3192 *dir = -EINVAL;
3193
3194 if (len < sizeof(struct sadb_x_policy) ||
3195 pol->sadb_x_policy_len*8 > len ||
3196 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3197 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3198 return NULL;
3199
3200 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3201 if (xp == NULL) {
3202 *dir = -ENOBUFS;
3203 return NULL;
3204 }
3205
3206 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3207 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3208
3209 xp->lft.soft_byte_limit = XFRM_INF;
3210 xp->lft.hard_byte_limit = XFRM_INF;
3211 xp->lft.soft_packet_limit = XFRM_INF;
3212 xp->lft.hard_packet_limit = XFRM_INF;
3213 xp->family = sk->sk_family;
3214
3215 xp->xfrm_nr = 0;
3216 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3217 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3218 goto out;
3219
3220 /* security context too */
3221 if (len >= (pol->sadb_x_policy_len*8 +
3222 sizeof(struct sadb_x_sec_ctx))) {
3223 char *p = (char *)pol;
3224 struct xfrm_user_sec_ctx *uctx;
3225
3226 p += pol->sadb_x_policy_len*8;
3227 sec_ctx = (struct sadb_x_sec_ctx *)p;
3228 if (len < pol->sadb_x_policy_len*8 +
3229 sec_ctx->sadb_x_sec_len) {
3230 *dir = -EINVAL;
3231 goto out;
3232 }
3233 if ((*dir = verify_sec_ctx_len(p)))
3234 goto out;
3235 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3236 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3237 kfree(uctx);
3238
3239 if (*dir)
3240 goto out;
3241 }
3242
3243 *dir = pol->sadb_x_policy_dir-1;
3244 return xp;
3245
3246 out:
3247 xp->walk.dead = 1;
3248 xfrm_policy_destroy(xp);
3249 return NULL;
3250 }
3251
3252 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3253 {
3254 struct sk_buff *skb;
3255 struct sadb_msg *hdr;
3256 struct sadb_sa *sa;
3257 struct sadb_address *addr;
3258 struct sadb_x_nat_t_port *n_port;
3259 int sockaddr_size;
3260 int size;
3261 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3262 struct xfrm_encap_tmpl *natt = NULL;
3263
3264 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3265 if (!sockaddr_size)
3266 return -EINVAL;
3267
3268 if (!satype)
3269 return -EINVAL;
3270
3271 if (!x->encap)
3272 return -EINVAL;
3273
3274 natt = x->encap;
3275
3276 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3277 *
3278 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3279 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3280 */
3281
3282 size = sizeof(struct sadb_msg) +
3283 sizeof(struct sadb_sa) +
3284 (sizeof(struct sadb_address) * 2) +
3285 (sockaddr_size * 2) +
3286 (sizeof(struct sadb_x_nat_t_port) * 2);
3287
3288 skb = alloc_skb(size + 16, GFP_ATOMIC);
3289 if (skb == NULL)
3290 return -ENOMEM;
3291
3292 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3293 hdr->sadb_msg_version = PF_KEY_V2;
3294 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3295 hdr->sadb_msg_satype = satype;
3296 hdr->sadb_msg_len = size / sizeof(uint64_t);
3297 hdr->sadb_msg_errno = 0;
3298 hdr->sadb_msg_reserved = 0;
3299 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3300 hdr->sadb_msg_pid = 0;
3301
3302 /* SA */
3303 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3304 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3305 sa->sadb_sa_exttype = SADB_EXT_SA;
3306 sa->sadb_sa_spi = x->id.spi;
3307 sa->sadb_sa_replay = 0;
3308 sa->sadb_sa_state = 0;
3309 sa->sadb_sa_auth = 0;
3310 sa->sadb_sa_encrypt = 0;
3311 sa->sadb_sa_flags = 0;
3312
3313 /* ADDRESS_SRC (old addr) */
3314 addr = (struct sadb_address*)
3315 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3316 addr->sadb_address_len =
3317 (sizeof(struct sadb_address)+sockaddr_size)/
3318 sizeof(uint64_t);
3319 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3320 addr->sadb_address_proto = 0;
3321 addr->sadb_address_reserved = 0;
3322 addr->sadb_address_prefixlen =
3323 pfkey_sockaddr_fill(&x->props.saddr, 0,
3324 (struct sockaddr *) (addr + 1),
3325 x->props.family);
3326 if (!addr->sadb_address_prefixlen)
3327 BUG();
3328
3329 /* NAT_T_SPORT (old port) */
3330 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3331 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3332 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3333 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3334 n_port->sadb_x_nat_t_port_reserved = 0;
3335
3336 /* ADDRESS_DST (new addr) */
3337 addr = (struct sadb_address*)
3338 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3339 addr->sadb_address_len =
3340 (sizeof(struct sadb_address)+sockaddr_size)/
3341 sizeof(uint64_t);
3342 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3343 addr->sadb_address_proto = 0;
3344 addr->sadb_address_reserved = 0;
3345 addr->sadb_address_prefixlen =
3346 pfkey_sockaddr_fill(ipaddr, 0,
3347 (struct sockaddr *) (addr + 1),
3348 x->props.family);
3349 if (!addr->sadb_address_prefixlen)
3350 BUG();
3351
3352 /* NAT_T_DPORT (new port) */
3353 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3354 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3355 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3356 n_port->sadb_x_nat_t_port_port = sport;
3357 n_port->sadb_x_nat_t_port_reserved = 0;
3358
3359 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3360 }
3361
3362 #ifdef CONFIG_NET_KEY_MIGRATE
3363 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3364 struct xfrm_selector *sel)
3365 {
3366 struct sadb_address *addr;
3367 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3368 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3369 addr->sadb_address_exttype = type;
3370 addr->sadb_address_proto = sel->proto;
3371 addr->sadb_address_reserved = 0;
3372
3373 switch (type) {
3374 case SADB_EXT_ADDRESS_SRC:
3375 addr->sadb_address_prefixlen = sel->prefixlen_s;
3376 pfkey_sockaddr_fill(&sel->saddr, 0,
3377 (struct sockaddr *)(addr + 1),
3378 sel->family);
3379 break;
3380 case SADB_EXT_ADDRESS_DST:
3381 addr->sadb_address_prefixlen = sel->prefixlen_d;
3382 pfkey_sockaddr_fill(&sel->daddr, 0,
3383 (struct sockaddr *)(addr + 1),
3384 sel->family);
3385 break;
3386 default:
3387 return -EINVAL;
3388 }
3389
3390 return 0;
3391 }
3392
3393
3394 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3395 {
3396 struct sadb_x_kmaddress *kma;
3397 u8 *sa;
3398 int family = k->family;
3399 int socklen = pfkey_sockaddr_len(family);
3400 int size_req;
3401
3402 size_req = (sizeof(struct sadb_x_kmaddress) +
3403 pfkey_sockaddr_pair_size(family));
3404
3405 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3406 memset(kma, 0, size_req);
3407 kma->sadb_x_kmaddress_len = size_req / 8;
3408 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3409 kma->sadb_x_kmaddress_reserved = k->reserved;
3410
3411 sa = (u8 *)(kma + 1);
3412 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3413 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3414 return -EINVAL;
3415
3416 return 0;
3417 }
3418
3419 static int set_ipsecrequest(struct sk_buff *skb,
3420 uint8_t proto, uint8_t mode, int level,
3421 uint32_t reqid, uint8_t family,
3422 xfrm_address_t *src, xfrm_address_t *dst)
3423 {
3424 struct sadb_x_ipsecrequest *rq;
3425 u8 *sa;
3426 int socklen = pfkey_sockaddr_len(family);
3427 int size_req;
3428
3429 size_req = sizeof(struct sadb_x_ipsecrequest) +
3430 pfkey_sockaddr_pair_size(family);
3431
3432 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3433 memset(rq, 0, size_req);
3434 rq->sadb_x_ipsecrequest_len = size_req;
3435 rq->sadb_x_ipsecrequest_proto = proto;
3436 rq->sadb_x_ipsecrequest_mode = mode;
3437 rq->sadb_x_ipsecrequest_level = level;
3438 rq->sadb_x_ipsecrequest_reqid = reqid;
3439
3440 sa = (u8 *) (rq + 1);
3441 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3442 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3443 return -EINVAL;
3444
3445 return 0;
3446 }
3447 #endif
3448
3449 #ifdef CONFIG_NET_KEY_MIGRATE
3450 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3451 struct xfrm_migrate *m, int num_bundles,
3452 struct xfrm_kmaddress *k)
3453 {
3454 int i;
3455 int sasize_sel;
3456 int size = 0;
3457 int size_pol = 0;
3458 struct sk_buff *skb;
3459 struct sadb_msg *hdr;
3460 struct sadb_x_policy *pol;
3461 struct xfrm_migrate *mp;
3462
3463 if (type != XFRM_POLICY_TYPE_MAIN)
3464 return 0;
3465
3466 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3467 return -EINVAL;
3468
3469 if (k != NULL) {
3470 /* addresses for KM */
3471 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3472 pfkey_sockaddr_pair_size(k->family));
3473 }
3474
3475 /* selector */
3476 sasize_sel = pfkey_sockaddr_size(sel->family);
3477 if (!sasize_sel)
3478 return -EINVAL;
3479 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3480
3481 /* policy info */
3482 size_pol += sizeof(struct sadb_x_policy);
3483
3484 /* ipsecrequests */
3485 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3486 /* old locator pair */
3487 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3488 pfkey_sockaddr_pair_size(mp->old_family);
3489 /* new locator pair */
3490 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3491 pfkey_sockaddr_pair_size(mp->new_family);
3492 }
3493
3494 size += sizeof(struct sadb_msg) + size_pol;
3495
3496 /* alloc buffer */
3497 skb = alloc_skb(size, GFP_ATOMIC);
3498 if (skb == NULL)
3499 return -ENOMEM;
3500
3501 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3502 hdr->sadb_msg_version = PF_KEY_V2;
3503 hdr->sadb_msg_type = SADB_X_MIGRATE;
3504 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3505 hdr->sadb_msg_len = size / 8;
3506 hdr->sadb_msg_errno = 0;
3507 hdr->sadb_msg_reserved = 0;
3508 hdr->sadb_msg_seq = 0;
3509 hdr->sadb_msg_pid = 0;
3510
3511 /* Addresses to be used by KM for negotiation, if ext is available */
3512 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3513 return -EINVAL;
3514
3515 /* selector src */
3516 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3517
3518 /* selector dst */
3519 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3520
3521 /* policy information */
3522 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3523 pol->sadb_x_policy_len = size_pol / 8;
3524 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3525 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3526 pol->sadb_x_policy_dir = dir + 1;
3527 pol->sadb_x_policy_id = 0;
3528 pol->sadb_x_policy_priority = 0;
3529
3530 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3531 /* old ipsecrequest */
3532 int mode = pfkey_mode_from_xfrm(mp->mode);
3533 if (mode < 0)
3534 goto err;
3535 if (set_ipsecrequest(skb, mp->proto, mode,
3536 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3537 mp->reqid, mp->old_family,
3538 &mp->old_saddr, &mp->old_daddr) < 0)
3539 goto err;
3540
3541 /* new ipsecrequest */
3542 if (set_ipsecrequest(skb, mp->proto, mode,
3543 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3544 mp->reqid, mp->new_family,
3545 &mp->new_saddr, &mp->new_daddr) < 0)
3546 goto err;
3547 }
3548
3549 /* broadcast migrate message to sockets */
3550 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3551
3552 return 0;
3553
3554 err:
3555 kfree_skb(skb);
3556 return -EINVAL;
3557 }
3558 #else
3559 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3560 struct xfrm_migrate *m, int num_bundles,
3561 struct xfrm_kmaddress *k)
3562 {
3563 return -ENOPROTOOPT;
3564 }
3565 #endif
3566
3567 static int pfkey_sendmsg(struct kiocb *kiocb,
3568 struct socket *sock, struct msghdr *msg, size_t len)
3569 {
3570 struct sock *sk = sock->sk;
3571 struct sk_buff *skb = NULL;
3572 struct sadb_msg *hdr = NULL;
3573 int err;
3574
3575 err = -EOPNOTSUPP;
3576 if (msg->msg_flags & MSG_OOB)
3577 goto out;
3578
3579 err = -EMSGSIZE;
3580 if ((unsigned)len > sk->sk_sndbuf - 32)
3581 goto out;
3582
3583 err = -ENOBUFS;
3584 skb = alloc_skb(len, GFP_KERNEL);
3585 if (skb == NULL)
3586 goto out;
3587
3588 err = -EFAULT;
3589 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3590 goto out;
3591
3592 hdr = pfkey_get_base_msg(skb, &err);
3593 if (!hdr)
3594 goto out;
3595
3596 mutex_lock(&xfrm_cfg_mutex);
3597 err = pfkey_process(sk, skb, hdr);
3598 mutex_unlock(&xfrm_cfg_mutex);
3599
3600 out:
3601 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3602 err = 0;
3603 kfree_skb(skb);
3604
3605 return err ? : len;
3606 }
3607
3608 static int pfkey_recvmsg(struct kiocb *kiocb,
3609 struct socket *sock, struct msghdr *msg, size_t len,
3610 int flags)
3611 {
3612 struct sock *sk = sock->sk;
3613 struct pfkey_sock *pfk = pfkey_sk(sk);
3614 struct sk_buff *skb;
3615 int copied, err;
3616
3617 err = -EINVAL;
3618 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3619 goto out;
3620
3621 msg->msg_namelen = 0;
3622 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3623 if (skb == NULL)
3624 goto out;
3625
3626 copied = skb->len;
3627 if (copied > len) {
3628 msg->msg_flags |= MSG_TRUNC;
3629 copied = len;
3630 }
3631
3632 skb_reset_transport_header(skb);
3633 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3634 if (err)
3635 goto out_free;
3636
3637 sock_recv_ts_and_drops(msg, sk, skb);
3638
3639 err = (flags & MSG_TRUNC) ? skb->len : copied;
3640
3641 if (pfk->dump.dump != NULL &&
3642 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3643 pfkey_do_dump(pfk);
3644
3645 out_free:
3646 skb_free_datagram(sk, skb);
3647 out:
3648 return err;
3649 }
3650
3651 static const struct proto_ops pfkey_ops = {
3652 .family = PF_KEY,
3653 .owner = THIS_MODULE,
3654 /* Operations that make no sense on pfkey sockets. */
3655 .bind = sock_no_bind,
3656 .connect = sock_no_connect,
3657 .socketpair = sock_no_socketpair,
3658 .accept = sock_no_accept,
3659 .getname = sock_no_getname,
3660 .ioctl = sock_no_ioctl,
3661 .listen = sock_no_listen,
3662 .shutdown = sock_no_shutdown,
3663 .setsockopt = sock_no_setsockopt,
3664 .getsockopt = sock_no_getsockopt,
3665 .mmap = sock_no_mmap,
3666 .sendpage = sock_no_sendpage,
3667
3668 /* Now the operations that really occur. */
3669 .release = pfkey_release,
3670 .poll = datagram_poll,
3671 .sendmsg = pfkey_sendmsg,
3672 .recvmsg = pfkey_recvmsg,
3673 };
3674
3675 static const struct net_proto_family pfkey_family_ops = {
3676 .family = PF_KEY,
3677 .create = pfkey_create,
3678 .owner = THIS_MODULE,
3679 };
3680
3681 #ifdef CONFIG_PROC_FS
3682 static int pfkey_seq_show(struct seq_file *f, void *v)
3683 {
3684 struct sock *s = sk_entry(v);
3685
3686 if (v == SEQ_START_TOKEN)
3687 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3688 else
3689 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3690 s,
3691 atomic_read(&s->sk_refcnt),
3692 sk_rmem_alloc_get(s),
3693 sk_wmem_alloc_get(s),
3694 sock_i_uid(s),
3695 sock_i_ino(s)
3696 );
3697 return 0;
3698 }
3699
3700 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3701 {
3702 struct net *net = seq_file_net(f);
3703 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3704
3705 read_lock(&pfkey_table_lock);
3706 return seq_hlist_start_head(&net_pfkey->table, *ppos);
3707 }
3708
3709 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3710 {
3711 struct net *net = seq_file_net(f);
3712 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3713
3714 return seq_hlist_next(v, &net_pfkey->table, ppos);
3715 }
3716
3717 static void pfkey_seq_stop(struct seq_file *f, void *v)
3718 {
3719 read_unlock(&pfkey_table_lock);
3720 }
3721
3722 static const struct seq_operations pfkey_seq_ops = {
3723 .start = pfkey_seq_start,
3724 .next = pfkey_seq_next,
3725 .stop = pfkey_seq_stop,
3726 .show = pfkey_seq_show,
3727 };
3728
3729 static int pfkey_seq_open(struct inode *inode, struct file *file)
3730 {
3731 return seq_open_net(inode, file, &pfkey_seq_ops,
3732 sizeof(struct seq_net_private));
3733 }
3734
3735 static const struct file_operations pfkey_proc_ops = {
3736 .open = pfkey_seq_open,
3737 .read = seq_read,
3738 .llseek = seq_lseek,
3739 .release = seq_release_net,
3740 };
3741
3742 static int __net_init pfkey_init_proc(struct net *net)
3743 {
3744 struct proc_dir_entry *e;
3745
3746 e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3747 if (e == NULL)
3748 return -ENOMEM;
3749
3750 return 0;
3751 }
3752
3753 static void __net_exit pfkey_exit_proc(struct net *net)
3754 {
3755 proc_net_remove(net, "pfkey");
3756 }
3757 #else
3758 static inline int pfkey_init_proc(struct net *net)
3759 {
3760 return 0;
3761 }
3762
3763 static inline void pfkey_exit_proc(struct net *net)
3764 {
3765 }
3766 #endif
3767
3768 static struct xfrm_mgr pfkeyv2_mgr =
3769 {
3770 .id = "pfkeyv2",
3771 .notify = pfkey_send_notify,
3772 .acquire = pfkey_send_acquire,
3773 .compile_policy = pfkey_compile_policy,
3774 .new_mapping = pfkey_send_new_mapping,
3775 .notify_policy = pfkey_send_policy_notify,
3776 .migrate = pfkey_send_migrate,
3777 };
3778
3779 static int __net_init pfkey_net_init(struct net *net)
3780 {
3781 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3782 int rv;
3783
3784 INIT_HLIST_HEAD(&net_pfkey->table);
3785 atomic_set(&net_pfkey->socks_nr, 0);
3786
3787 rv = pfkey_init_proc(net);
3788
3789 return rv;
3790 }
3791
3792 static void __net_exit pfkey_net_exit(struct net *net)
3793 {
3794 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3795
3796 pfkey_exit_proc(net);
3797 BUG_ON(!hlist_empty(&net_pfkey->table));
3798 }
3799
3800 static struct pernet_operations pfkey_net_ops = {
3801 .init = pfkey_net_init,
3802 .exit = pfkey_net_exit,
3803 .id = &pfkey_net_id,
3804 .size = sizeof(struct netns_pfkey),
3805 };
3806
3807 static void __exit ipsec_pfkey_exit(void)
3808 {
3809 xfrm_unregister_km(&pfkeyv2_mgr);
3810 sock_unregister(PF_KEY);
3811 unregister_pernet_subsys(&pfkey_net_ops);
3812 proto_unregister(&key_proto);
3813 }
3814
3815 static int __init ipsec_pfkey_init(void)
3816 {
3817 int err = proto_register(&key_proto, 0);
3818
3819 if (err != 0)
3820 goto out;
3821
3822 err = register_pernet_subsys(&pfkey_net_ops);
3823 if (err != 0)
3824 goto out_unregister_key_proto;
3825 err = sock_register(&pfkey_family_ops);
3826 if (err != 0)
3827 goto out_unregister_pernet;
3828 err = xfrm_register_km(&pfkeyv2_mgr);
3829 if (err != 0)
3830 goto out_sock_unregister;
3831 out:
3832 return err;
3833
3834 out_sock_unregister:
3835 sock_unregister(PF_KEY);
3836 out_unregister_pernet:
3837 unregister_pernet_subsys(&pfkey_net_ops);
3838 out_unregister_key_proto:
3839 proto_unregister(&key_proto);
3840 goto out;
3841 }
3842
3843 module_init(ipsec_pfkey_init);
3844 module_exit(ipsec_pfkey_exit);
3845 MODULE_LICENSE("GPL");
3846 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux kernel - Deliverables
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