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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[GitHub/mt8127/android_kernel_alcatel_ttab.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 DEFINE_MUTEX(pfkey_mutex);
45
46 #define DUMMY_MARK 0
47 static struct xfrm_mark dummy_mark = {0, 0};
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 const struct proto_ops pfkey_ops;
112
113 static void pfkey_insert(struct sock *sk)
114 {
115 struct net *net = sock_net(sk);
116 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
117
118 mutex_lock(&pfkey_mutex);
119 sk_add_node_rcu(sk, &net_pfkey->table);
120 mutex_unlock(&pfkey_mutex);
121 }
122
123 static void pfkey_remove(struct sock *sk)
124 {
125 mutex_lock(&pfkey_mutex);
126 sk_del_node_init_rcu(sk);
127 mutex_unlock(&pfkey_mutex);
128 }
129
130 static struct proto key_proto = {
131 .name = "KEY",
132 .owner = THIS_MODULE,
133 .obj_size = sizeof(struct pfkey_sock),
134 };
135
136 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
137 int kern)
138 {
139 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
140 struct sock *sk;
141 int err;
142
143 if (!capable(CAP_NET_ADMIN))
144 return -EPERM;
145 if (sock->type != SOCK_RAW)
146 return -ESOCKTNOSUPPORT;
147 if (protocol != PF_KEY_V2)
148 return -EPROTONOSUPPORT;
149
150 err = -ENOMEM;
151 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
152 if (sk == NULL)
153 goto out;
154
155 sock->ops = &pfkey_ops;
156 sock_init_data(sock, sk);
157
158 sk->sk_family = PF_KEY;
159 sk->sk_destruct = pfkey_sock_destruct;
160
161 atomic_inc(&net_pfkey->socks_nr);
162
163 pfkey_insert(sk);
164
165 return 0;
166 out:
167 return err;
168 }
169
170 static int pfkey_release(struct socket *sock)
171 {
172 struct sock *sk = sock->sk;
173
174 if (!sk)
175 return 0;
176
177 pfkey_remove(sk);
178
179 sock_orphan(sk);
180 sock->sk = NULL;
181 skb_queue_purge(&sk->sk_write_queue);
182
183 synchronize_rcu();
184 sock_put(sk);
185
186 return 0;
187 }
188
189 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
190 gfp_t allocation, struct sock *sk)
191 {
192 int err = -ENOBUFS;
193
194 sock_hold(sk);
195 if (*skb2 == NULL) {
196 if (atomic_read(&skb->users) != 1) {
197 *skb2 = skb_clone(skb, allocation);
198 } else {
199 *skb2 = skb;
200 atomic_inc(&skb->users);
201 }
202 }
203 if (*skb2 != NULL) {
204 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
205 skb_orphan(*skb2);
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*skb2)->len);
209 *skb2 = NULL;
210 err = 0;
211 }
212 }
213 sock_put(sk);
214 return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria. */
218 #define BROADCAST_ALL 0
219 #define BROADCAST_ONE 1
220 #define BROADCAST_REGISTERED 2
221 #define BROADCAST_PROMISC_ONLY 4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 int broadcast_flags, struct sock *one_sk,
224 struct net *net)
225 {
226 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 struct sock *sk;
228 struct hlist_node *node;
229 struct sk_buff *skb2 = NULL;
230 int err = -ESRCH;
231
232 /* XXX Do we need something like netlink_overrun? I think
233 * XXX PF_KEY socket apps will not mind current behavior.
234 */
235 if (!skb)
236 return -ENOMEM;
237
238 rcu_read_lock();
239 sk_for_each_rcu(sk, node, &net_pfkey->table) {
240 struct pfkey_sock *pfk = pfkey_sk(sk);
241 int err2;
242
243 /* Yes, it means that if you are meant to receive this
244 * pfkey message you receive it twice as promiscuous
245 * socket.
246 */
247 if (pfk->promisc)
248 pfkey_broadcast_one(skb, &skb2, allocation, sk);
249
250 /* the exact target will be processed later */
251 if (sk == one_sk)
252 continue;
253 if (broadcast_flags != BROADCAST_ALL) {
254 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
255 continue;
256 if ((broadcast_flags & BROADCAST_REGISTERED) &&
257 !pfk->registered)
258 continue;
259 if (broadcast_flags & BROADCAST_ONE)
260 continue;
261 }
262
263 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
264
265 /* Error is cleare after succecful sending to at least one
266 * registered KM */
267 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
268 err = err2;
269 }
270 rcu_read_unlock();
271
272 if (one_sk != NULL)
273 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
274
275 kfree_skb(skb2);
276 kfree_skb(skb);
277 return err;
278 }
279
280 static int pfkey_do_dump(struct pfkey_sock *pfk)
281 {
282 struct sadb_msg *hdr;
283 int rc;
284
285 rc = pfk->dump.dump(pfk);
286 if (rc == -ENOBUFS)
287 return 0;
288
289 if (pfk->dump.skb) {
290 if (!pfkey_can_dump(&pfk->sk))
291 return 0;
292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 &pfk->sk, sock_net(&pfk->sk));
298 pfk->dump.skb = NULL;
299 }
300
301 pfkey_terminate_dump(pfk);
302 return rc;
303 }
304
305 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
306 {
307 *new = *orig;
308 }
309
310 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
311 {
312 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313 struct sadb_msg *hdr;
314
315 if (!skb)
316 return -ENOBUFS;
317
318 /* Woe be to the platform trying to support PFKEY yet
319 * having normal errnos outside the 1-255 range, inclusive.
320 */
321 err = -err;
322 if (err == ERESTARTSYS ||
323 err == ERESTARTNOHAND ||
324 err == ERESTARTNOINTR)
325 err = EINTR;
326 if (err >= 512)
327 err = EINVAL;
328 BUG_ON(err <= 0 || err >= 256);
329
330 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331 pfkey_hdr_dup(hdr, orig);
332 hdr->sadb_msg_errno = (uint8_t) err;
333 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334 sizeof(uint64_t));
335
336 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338 return 0;
339 }
340
341 static u8 sadb_ext_min_len[] = {
342 [SADB_EXT_RESERVED] = (u8) 0,
343 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
344 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
345 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
348 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
351 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
353 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
355 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
356 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
357 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
359 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
360 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
361 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
362 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
363 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
364 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
366 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
367 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family. */
371 static int verify_address_len(void *p)
372 {
373 struct sadb_address *sp = p;
374 struct sockaddr *addr = (struct sockaddr *)(sp + 1);
375 struct sockaddr_in *sin;
376 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
377 struct sockaddr_in6 *sin6;
378 #endif
379 int len;
380
381 switch (addr->sa_family) {
382 case AF_INET:
383 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384 if (sp->sadb_address_len != len ||
385 sp->sadb_address_prefixlen > 32)
386 return -EINVAL;
387 break;
388 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
389 case AF_INET6:
390 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391 if (sp->sadb_address_len != len ||
392 sp->sadb_address_prefixlen > 128)
393 return -EINVAL;
394 break;
395 #endif
396 default:
397 /* It is user using kernel to keep track of security
398 * associations for another protocol, such as
399 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
400 * lengths.
401 *
402 * XXX Actually, association/policy database is not yet
403 * XXX able to cope with arbitrary sockaddr families.
404 * XXX When it can, remove this -EINVAL. -DaveM
405 */
406 return -EINVAL;
407 break;
408 }
409
410 return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
414 {
415 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416 sec_ctx->sadb_x_ctx_len,
417 sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(void *p)
421 {
422 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
423 int len = sec_ctx->sadb_x_ctx_len;
424
425 if (len > PAGE_SIZE)
426 return -EINVAL;
427
428 len = pfkey_sec_ctx_len(sec_ctx);
429
430 if (sec_ctx->sadb_x_sec_len != len)
431 return -EINVAL;
432
433 return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
437 {
438 struct xfrm_user_sec_ctx *uctx = NULL;
439 int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443 if (!uctx)
444 return NULL;
445
446 uctx->len = pfkey_sec_ctx_len(sec_ctx);
447 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451 memcpy(uctx + 1, sec_ctx + 1,
452 uctx->ctx_len);
453
454 return uctx;
455 }
456
457 static int present_and_same_family(struct sadb_address *src,
458 struct sadb_address *dst)
459 {
460 struct sockaddr *s_addr, *d_addr;
461
462 if (!src || !dst)
463 return 0;
464
465 s_addr = (struct sockaddr *)(src + 1);
466 d_addr = (struct sockaddr *)(dst + 1);
467 if (s_addr->sa_family != d_addr->sa_family)
468 return 0;
469 if (s_addr->sa_family != AF_INET
470 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
471 && s_addr->sa_family != AF_INET6
472 #endif
473 )
474 return 0;
475
476 return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
480 {
481 char *p = (char *) hdr;
482 int len = skb->len;
483
484 len -= sizeof(*hdr);
485 p += sizeof(*hdr);
486 while (len > 0) {
487 struct sadb_ext *ehdr = (struct sadb_ext *) p;
488 uint16_t ext_type;
489 int ext_len;
490
491 ext_len = ehdr->sadb_ext_len;
492 ext_len *= sizeof(uint64_t);
493 ext_type = ehdr->sadb_ext_type;
494 if (ext_len < sizeof(uint64_t) ||
495 ext_len > len ||
496 ext_type == SADB_EXT_RESERVED)
497 return -EINVAL;
498
499 if (ext_type <= SADB_EXT_MAX) {
500 int min = (int) sadb_ext_min_len[ext_type];
501 if (ext_len < min)
502 return -EINVAL;
503 if (ext_hdrs[ext_type-1] != NULL)
504 return -EINVAL;
505 if (ext_type == SADB_EXT_ADDRESS_SRC ||
506 ext_type == SADB_EXT_ADDRESS_DST ||
507 ext_type == SADB_EXT_ADDRESS_PROXY ||
508 ext_type == SADB_X_EXT_NAT_T_OA) {
509 if (verify_address_len(p))
510 return -EINVAL;
511 }
512 if (ext_type == SADB_X_EXT_SEC_CTX) {
513 if (verify_sec_ctx_len(p))
514 return -EINVAL;
515 }
516 ext_hdrs[ext_type-1] = p;
517 }
518 p += ext_len;
519 len -= ext_len;
520 }
521
522 return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528 switch (satype) {
529 case SADB_SATYPE_UNSPEC:
530 return IPSEC_PROTO_ANY;
531 case SADB_SATYPE_AH:
532 return IPPROTO_AH;
533 case SADB_SATYPE_ESP:
534 return IPPROTO_ESP;
535 case SADB_X_SATYPE_IPCOMP:
536 return IPPROTO_COMP;
537 break;
538 default:
539 return 0;
540 }
541 /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547 switch (proto) {
548 case IPPROTO_AH:
549 return SADB_SATYPE_AH;
550 case IPPROTO_ESP:
551 return SADB_SATYPE_ESP;
552 case IPPROTO_COMP:
553 return SADB_X_SATYPE_IPCOMP;
554 break;
555 default:
556 return 0;
557 }
558 /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562 * say specifically 'just raw sockets' as we encode them as 255.
563 */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572 return (proto ? proto : IPSEC_PROTO_ANY);
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577 switch (family) {
578 case AF_INET:
579 return sizeof(struct sockaddr_in);
580 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
581 case AF_INET6:
582 return sizeof(struct sockaddr_in6);
583 #endif
584 }
585 return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591 switch (sa->sa_family) {
592 case AF_INET:
593 xaddr->a4 =
594 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595 return AF_INET;
596 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
597 case AF_INET6:
598 memcpy(xaddr->a6,
599 &((struct sockaddr_in6 *)sa)->sin6_addr,
600 sizeof(struct in6_addr));
601 return AF_INET6;
602 #endif
603 }
604 return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611 xaddr);
612 }
613
614 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs)
615 {
616 struct sadb_sa *sa;
617 struct sadb_address *addr;
618 uint16_t proto;
619 unsigned short family;
620 xfrm_address_t *xaddr;
621
622 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
623 if (sa == NULL)
624 return NULL;
625
626 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627 if (proto == 0)
628 return NULL;
629
630 /* sadb_address_len should be checked by caller */
631 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
632 if (addr == NULL)
633 return NULL;
634
635 family = ((struct sockaddr *)(addr + 1))->sa_family;
636 switch (family) {
637 case AF_INET:
638 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
639 break;
640 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
641 case AF_INET6:
642 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643 break;
644 #endif
645 default:
646 xaddr = NULL;
647 }
648
649 if (!xaddr)
650 return NULL;
651
652 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665 switch(mode) {
666 case XFRM_MODE_TRANSPORT:
667 return IPSEC_MODE_TRANSPORT;
668 case XFRM_MODE_TUNNEL:
669 return IPSEC_MODE_TUNNEL;
670 case XFRM_MODE_BEET:
671 return IPSEC_MODE_BEET;
672 default:
673 return -1;
674 }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679 switch(mode) {
680 case IPSEC_MODE_ANY: /*XXX*/
681 case IPSEC_MODE_TRANSPORT:
682 return XFRM_MODE_TRANSPORT;
683 case IPSEC_MODE_TUNNEL:
684 return XFRM_MODE_TUNNEL;
685 case IPSEC_MODE_BEET:
686 return XFRM_MODE_BEET;
687 default:
688 return -1;
689 }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
693 struct sockaddr *sa,
694 unsigned short family)
695 {
696 switch (family) {
697 case AF_INET:
698 {
699 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700 sin->sin_family = AF_INET;
701 sin->sin_port = port;
702 sin->sin_addr.s_addr = xaddr->a4;
703 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704 return 32;
705 }
706 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
707 case AF_INET6:
708 {
709 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710 sin6->sin6_family = AF_INET6;
711 sin6->sin6_port = port;
712 sin6->sin6_flowinfo = 0;
713 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
714 sin6->sin6_scope_id = 0;
715 return 128;
716 }
717 #endif
718 }
719 return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
723 int add_keys, int hsc)
724 {
725 struct sk_buff *skb;
726 struct sadb_msg *hdr;
727 struct sadb_sa *sa;
728 struct sadb_lifetime *lifetime;
729 struct sadb_address *addr;
730 struct sadb_key *key;
731 struct sadb_x_sa2 *sa2;
732 struct sadb_x_sec_ctx *sec_ctx;
733 struct xfrm_sec_ctx *xfrm_ctx;
734 int ctx_size = 0;
735 int size;
736 int auth_key_size = 0;
737 int encrypt_key_size = 0;
738 int sockaddr_size;
739 struct xfrm_encap_tmpl *natt = NULL;
740 int mode;
741
742 /* address family check */
743 sockaddr_size = pfkey_sockaddr_size(x->props.family);
744 if (!sockaddr_size)
745 return ERR_PTR(-EINVAL);
746
747 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748 key(AE), (identity(SD),) (sensitivity)> */
749 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750 sizeof(struct sadb_lifetime) +
751 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753 sizeof(struct sadb_address)*2 +
754 sockaddr_size*2 +
755 sizeof(struct sadb_x_sa2);
756
757 if ((xfrm_ctx = x->security)) {
758 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760 }
761
762 /* identity & sensitivity */
763 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
764 size += sizeof(struct sadb_address) + sockaddr_size;
765
766 if (add_keys) {
767 if (x->aalg && x->aalg->alg_key_len) {
768 auth_key_size =
769 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770 size += sizeof(struct sadb_key) + auth_key_size;
771 }
772 if (x->ealg && x->ealg->alg_key_len) {
773 encrypt_key_size =
774 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775 size += sizeof(struct sadb_key) + encrypt_key_size;
776 }
777 }
778 if (x->encap)
779 natt = x->encap;
780
781 if (natt && natt->encap_type) {
782 size += sizeof(struct sadb_x_nat_t_type);
783 size += sizeof(struct sadb_x_nat_t_port);
784 size += sizeof(struct sadb_x_nat_t_port);
785 }
786
787 skb = alloc_skb(size + 16, GFP_ATOMIC);
788 if (skb == NULL)
789 return ERR_PTR(-ENOBUFS);
790
791 /* call should fill header later */
792 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793 memset(hdr, 0, size); /* XXX do we need this ? */
794 hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796 /* sa */
797 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
798 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799 sa->sadb_sa_exttype = SADB_EXT_SA;
800 sa->sadb_sa_spi = x->id.spi;
801 sa->sadb_sa_replay = x->props.replay_window;
802 switch (x->km.state) {
803 case XFRM_STATE_VALID:
804 sa->sadb_sa_state = x->km.dying ?
805 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806 break;
807 case XFRM_STATE_ACQ:
808 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809 break;
810 default:
811 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812 break;
813 }
814 sa->sadb_sa_auth = 0;
815 if (x->aalg) {
816 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
818 }
819 sa->sadb_sa_encrypt = 0;
820 BUG_ON(x->ealg && x->calg);
821 if (x->ealg) {
822 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
823 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
824 }
825 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
826 if (x->calg) {
827 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
828 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
829 }
830
831 sa->sadb_sa_flags = 0;
832 if (x->props.flags & XFRM_STATE_NOECN)
833 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
834 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
835 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
836 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
837 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
838
839 /* hard time */
840 if (hsc & 2) {
841 lifetime = (struct sadb_lifetime *) skb_put(skb,
842 sizeof(struct sadb_lifetime));
843 lifetime->sadb_lifetime_len =
844 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
845 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
846 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
847 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
848 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
849 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
850 }
851 /* soft time */
852 if (hsc & 1) {
853 lifetime = (struct sadb_lifetime *) skb_put(skb,
854 sizeof(struct sadb_lifetime));
855 lifetime->sadb_lifetime_len =
856 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
857 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
858 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
859 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
860 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
861 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
862 }
863 /* current time */
864 lifetime = (struct sadb_lifetime *) skb_put(skb,
865 sizeof(struct sadb_lifetime));
866 lifetime->sadb_lifetime_len =
867 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
868 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
869 lifetime->sadb_lifetime_allocations = x->curlft.packets;
870 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
871 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
872 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
873 /* src address */
874 addr = (struct sadb_address*) skb_put(skb,
875 sizeof(struct sadb_address)+sockaddr_size);
876 addr->sadb_address_len =
877 (sizeof(struct sadb_address)+sockaddr_size)/
878 sizeof(uint64_t);
879 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
880 /* "if the ports are non-zero, then the sadb_address_proto field,
881 normally zero, MUST be filled in with the transport
882 protocol's number." - RFC2367 */
883 addr->sadb_address_proto = 0;
884 addr->sadb_address_reserved = 0;
885
886 addr->sadb_address_prefixlen =
887 pfkey_sockaddr_fill(&x->props.saddr, 0,
888 (struct sockaddr *) (addr + 1),
889 x->props.family);
890 if (!addr->sadb_address_prefixlen)
891 BUG();
892
893 /* dst address */
894 addr = (struct sadb_address*) skb_put(skb,
895 sizeof(struct sadb_address)+sockaddr_size);
896 addr->sadb_address_len =
897 (sizeof(struct sadb_address)+sockaddr_size)/
898 sizeof(uint64_t);
899 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
900 addr->sadb_address_proto = 0;
901 addr->sadb_address_reserved = 0;
902
903 addr->sadb_address_prefixlen =
904 pfkey_sockaddr_fill(&x->id.daddr, 0,
905 (struct sockaddr *) (addr + 1),
906 x->props.family);
907 if (!addr->sadb_address_prefixlen)
908 BUG();
909
910 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
911 x->props.family)) {
912 addr = (struct sadb_address*) skb_put(skb,
913 sizeof(struct sadb_address)+sockaddr_size);
914 addr->sadb_address_len =
915 (sizeof(struct sadb_address)+sockaddr_size)/
916 sizeof(uint64_t);
917 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
918 addr->sadb_address_proto =
919 pfkey_proto_from_xfrm(x->sel.proto);
920 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
921 addr->sadb_address_reserved = 0;
922
923 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
924 (struct sockaddr *) (addr + 1),
925 x->props.family);
926 }
927
928 /* auth key */
929 if (add_keys && auth_key_size) {
930 key = (struct sadb_key *) skb_put(skb,
931 sizeof(struct sadb_key)+auth_key_size);
932 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
933 sizeof(uint64_t);
934 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
935 key->sadb_key_bits = x->aalg->alg_key_len;
936 key->sadb_key_reserved = 0;
937 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
938 }
939 /* encrypt key */
940 if (add_keys && encrypt_key_size) {
941 key = (struct sadb_key *) skb_put(skb,
942 sizeof(struct sadb_key)+encrypt_key_size);
943 key->sadb_key_len = (sizeof(struct sadb_key) +
944 encrypt_key_size) / sizeof(uint64_t);
945 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
946 key->sadb_key_bits = x->ealg->alg_key_len;
947 key->sadb_key_reserved = 0;
948 memcpy(key + 1, x->ealg->alg_key,
949 (x->ealg->alg_key_len+7)/8);
950 }
951
952 /* sa */
953 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
954 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
955 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
956 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
957 kfree_skb(skb);
958 return ERR_PTR(-EINVAL);
959 }
960 sa2->sadb_x_sa2_mode = mode;
961 sa2->sadb_x_sa2_reserved1 = 0;
962 sa2->sadb_x_sa2_reserved2 = 0;
963 sa2->sadb_x_sa2_sequence = 0;
964 sa2->sadb_x_sa2_reqid = x->props.reqid;
965
966 if (natt && natt->encap_type) {
967 struct sadb_x_nat_t_type *n_type;
968 struct sadb_x_nat_t_port *n_port;
969
970 /* type */
971 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
972 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
973 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
974 n_type->sadb_x_nat_t_type_type = natt->encap_type;
975 n_type->sadb_x_nat_t_type_reserved[0] = 0;
976 n_type->sadb_x_nat_t_type_reserved[1] = 0;
977 n_type->sadb_x_nat_t_type_reserved[2] = 0;
978
979 /* source port */
980 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
981 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
982 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
983 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
984 n_port->sadb_x_nat_t_port_reserved = 0;
985
986 /* dest port */
987 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
988 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
989 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
990 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
991 n_port->sadb_x_nat_t_port_reserved = 0;
992 }
993
994 /* security context */
995 if (xfrm_ctx) {
996 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
997 sizeof(struct sadb_x_sec_ctx) + ctx_size);
998 sec_ctx->sadb_x_sec_len =
999 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1000 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1001 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1002 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1003 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1004 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1005 xfrm_ctx->ctx_len);
1006 }
1007
1008 return skb;
1009 }
1010
1011
1012 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1013 {
1014 struct sk_buff *skb;
1015
1016 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1017
1018 return skb;
1019 }
1020
1021 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1022 int hsc)
1023 {
1024 return __pfkey_xfrm_state2msg(x, 0, hsc);
1025 }
1026
1027 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1028 struct sadb_msg *hdr,
1029 void **ext_hdrs)
1030 {
1031 struct xfrm_state *x;
1032 struct sadb_lifetime *lifetime;
1033 struct sadb_sa *sa;
1034 struct sadb_key *key;
1035 struct sadb_x_sec_ctx *sec_ctx;
1036 uint16_t proto;
1037 int err;
1038
1039
1040 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1041 if (!sa ||
1042 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1043 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1044 return ERR_PTR(-EINVAL);
1045 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1046 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1047 return ERR_PTR(-EINVAL);
1048 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1049 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1050 return ERR_PTR(-EINVAL);
1051 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1052 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1053 return ERR_PTR(-EINVAL);
1054
1055 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1056 if (proto == 0)
1057 return ERR_PTR(-EINVAL);
1058
1059 /* default error is no buffer space */
1060 err = -ENOBUFS;
1061
1062 /* RFC2367:
1063
1064 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1065 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1066 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1067 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1068 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1069 not true.
1070
1071 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1072 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1073 */
1074 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1075 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1076 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1077 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1078 return ERR_PTR(-EINVAL);
1079 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1080 if (key != NULL &&
1081 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1082 ((key->sadb_key_bits+7) / 8 == 0 ||
1083 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1084 return ERR_PTR(-EINVAL);
1085 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1086 if (key != NULL &&
1087 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1088 ((key->sadb_key_bits+7) / 8 == 0 ||
1089 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1090 return ERR_PTR(-EINVAL);
1091
1092 x = xfrm_state_alloc(net);
1093 if (x == NULL)
1094 return ERR_PTR(-ENOBUFS);
1095
1096 x->id.proto = proto;
1097 x->id.spi = sa->sadb_sa_spi;
1098 x->props.replay_window = sa->sadb_sa_replay;
1099 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1100 x->props.flags |= XFRM_STATE_NOECN;
1101 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1102 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1103 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1104 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1105
1106 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1107 if (lifetime != NULL) {
1108 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1109 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1110 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1111 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1112 }
1113 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1114 if (lifetime != NULL) {
1115 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1116 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1117 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1118 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1119 }
1120
1121 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1122 if (sec_ctx != NULL) {
1123 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1124
1125 if (!uctx)
1126 goto out;
1127
1128 err = security_xfrm_state_alloc(x, uctx);
1129 kfree(uctx);
1130
1131 if (err)
1132 goto out;
1133 }
1134
1135 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1136 if (sa->sadb_sa_auth) {
1137 int keysize = 0;
1138 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1139 if (!a) {
1140 err = -ENOSYS;
1141 goto out;
1142 }
1143 if (key)
1144 keysize = (key->sadb_key_bits + 7) / 8;
1145 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1146 if (!x->aalg)
1147 goto out;
1148 strcpy(x->aalg->alg_name, a->name);
1149 x->aalg->alg_key_len = 0;
1150 if (key) {
1151 x->aalg->alg_key_len = key->sadb_key_bits;
1152 memcpy(x->aalg->alg_key, key+1, keysize);
1153 }
1154 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1155 x->props.aalgo = sa->sadb_sa_auth;
1156 /* x->algo.flags = sa->sadb_sa_flags; */
1157 }
1158 if (sa->sadb_sa_encrypt) {
1159 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1160 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1161 if (!a) {
1162 err = -ENOSYS;
1163 goto out;
1164 }
1165 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1166 if (!x->calg)
1167 goto out;
1168 strcpy(x->calg->alg_name, a->name);
1169 x->props.calgo = sa->sadb_sa_encrypt;
1170 } else {
1171 int keysize = 0;
1172 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1173 if (!a) {
1174 err = -ENOSYS;
1175 goto out;
1176 }
1177 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1178 if (key)
1179 keysize = (key->sadb_key_bits + 7) / 8;
1180 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1181 if (!x->ealg)
1182 goto out;
1183 strcpy(x->ealg->alg_name, a->name);
1184 x->ealg->alg_key_len = 0;
1185 if (key) {
1186 x->ealg->alg_key_len = key->sadb_key_bits;
1187 memcpy(x->ealg->alg_key, key+1, keysize);
1188 }
1189 x->props.ealgo = sa->sadb_sa_encrypt;
1190 }
1191 }
1192 /* x->algo.flags = sa->sadb_sa_flags; */
1193
1194 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1195 &x->props.saddr);
1196 if (!x->props.family) {
1197 err = -EAFNOSUPPORT;
1198 goto out;
1199 }
1200 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201 &x->id.daddr);
1202
1203 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1205 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206 if (mode < 0) {
1207 err = -EINVAL;
1208 goto out;
1209 }
1210 x->props.mode = mode;
1211 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212 }
1213
1214 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217 /* Nobody uses this, but we try. */
1218 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220 }
1221
1222 if (!x->sel.family)
1223 x->sel.family = x->props.family;
1224
1225 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226 struct sadb_x_nat_t_type* n_type;
1227 struct xfrm_encap_tmpl *natt;
1228
1229 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230 if (!x->encap)
1231 goto out;
1232
1233 natt = x->encap;
1234 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238 struct sadb_x_nat_t_port* n_port =
1239 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241 }
1242 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243 struct sadb_x_nat_t_port* n_port =
1244 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246 }
1247 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248 }
1249
1250 err = xfrm_init_state(x);
1251 if (err)
1252 goto out;
1253
1254 x->km.seq = hdr->sadb_msg_seq;
1255 return x;
1256
1257 out:
1258 x->km.state = XFRM_STATE_DEAD;
1259 xfrm_state_put(x);
1260 return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1264 {
1265 return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1269 {
1270 struct net *net = sock_net(sk);
1271 struct sk_buff *resp_skb;
1272 struct sadb_x_sa2 *sa2;
1273 struct sadb_address *saddr, *daddr;
1274 struct sadb_msg *out_hdr;
1275 struct sadb_spirange *range;
1276 struct xfrm_state *x = NULL;
1277 int mode;
1278 int err;
1279 u32 min_spi, max_spi;
1280 u32 reqid;
1281 u8 proto;
1282 unsigned short family;
1283 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287 return -EINVAL;
1288
1289 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290 if (proto == 0)
1291 return -EINVAL;
1292
1293 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295 if (mode < 0)
1296 return -EINVAL;
1297 reqid = sa2->sadb_x_sa2_reqid;
1298 } else {
1299 mode = 0;
1300 reqid = 0;
1301 }
1302
1303 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307 switch (family) {
1308 case AF_INET:
1309 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311 break;
1312 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1313 case AF_INET6:
1314 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316 break;
1317 #endif
1318 }
1319
1320 if (hdr->sadb_msg_seq) {
1321 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1323 xfrm_state_put(x);
1324 x = NULL;
1325 }
1326 }
1327
1328 if (!x)
1329 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331 if (x == NULL)
1332 return -ENOENT;
1333
1334 min_spi = 0x100;
1335 max_spi = 0x0fffffff;
1336
1337 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338 if (range) {
1339 min_spi = range->sadb_spirange_min;
1340 max_spi = range->sadb_spirange_max;
1341 }
1342
1343 err = xfrm_alloc_spi(x, min_spi, max_spi);
1344 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1345
1346 if (IS_ERR(resp_skb)) {
1347 xfrm_state_put(x);
1348 return PTR_ERR(resp_skb);
1349 }
1350
1351 out_hdr = (struct sadb_msg *) resp_skb->data;
1352 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1353 out_hdr->sadb_msg_type = SADB_GETSPI;
1354 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1355 out_hdr->sadb_msg_errno = 0;
1356 out_hdr->sadb_msg_reserved = 0;
1357 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1358 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1359
1360 xfrm_state_put(x);
1361
1362 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1363
1364 return 0;
1365 }
1366
1367 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1368 {
1369 struct net *net = sock_net(sk);
1370 struct xfrm_state *x;
1371
1372 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1373 return -EOPNOTSUPP;
1374
1375 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1376 return 0;
1377
1378 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379 if (x == NULL)
1380 return 0;
1381
1382 spin_lock_bh(&x->lock);
1383 if (x->km.state == XFRM_STATE_ACQ) {
1384 x->km.state = XFRM_STATE_ERROR;
1385 wake_up(&net->xfrm.km_waitq);
1386 }
1387 spin_unlock_bh(&x->lock);
1388 xfrm_state_put(x);
1389 return 0;
1390 }
1391
1392 static inline int event2poltype(int event)
1393 {
1394 switch (event) {
1395 case XFRM_MSG_DELPOLICY:
1396 return SADB_X_SPDDELETE;
1397 case XFRM_MSG_NEWPOLICY:
1398 return SADB_X_SPDADD;
1399 case XFRM_MSG_UPDPOLICY:
1400 return SADB_X_SPDUPDATE;
1401 case XFRM_MSG_POLEXPIRE:
1402 // return SADB_X_SPDEXPIRE;
1403 default:
1404 printk("pfkey: Unknown policy event %d\n", event);
1405 break;
1406 }
1407
1408 return 0;
1409 }
1410
1411 static inline int event2keytype(int event)
1412 {
1413 switch (event) {
1414 case XFRM_MSG_DELSA:
1415 return SADB_DELETE;
1416 case XFRM_MSG_NEWSA:
1417 return SADB_ADD;
1418 case XFRM_MSG_UPDSA:
1419 return SADB_UPDATE;
1420 case XFRM_MSG_EXPIRE:
1421 return SADB_EXPIRE;
1422 default:
1423 printk("pfkey: Unknown SA event %d\n", event);
1424 break;
1425 }
1426
1427 return 0;
1428 }
1429
1430 /* ADD/UPD/DEL */
1431 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1432 {
1433 struct sk_buff *skb;
1434 struct sadb_msg *hdr;
1435
1436 skb = pfkey_xfrm_state2msg(x);
1437
1438 if (IS_ERR(skb))
1439 return PTR_ERR(skb);
1440
1441 hdr = (struct sadb_msg *) skb->data;
1442 hdr->sadb_msg_version = PF_KEY_V2;
1443 hdr->sadb_msg_type = event2keytype(c->event);
1444 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1445 hdr->sadb_msg_errno = 0;
1446 hdr->sadb_msg_reserved = 0;
1447 hdr->sadb_msg_seq = c->seq;
1448 hdr->sadb_msg_pid = c->pid;
1449
1450 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1451
1452 return 0;
1453 }
1454
1455 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1456 {
1457 struct net *net = sock_net(sk);
1458 struct xfrm_state *x;
1459 int err;
1460 struct km_event c;
1461
1462 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1463 if (IS_ERR(x))
1464 return PTR_ERR(x);
1465
1466 xfrm_state_hold(x);
1467 if (hdr->sadb_msg_type == SADB_ADD)
1468 err = xfrm_state_add(x);
1469 else
1470 err = xfrm_state_update(x);
1471
1472 xfrm_audit_state_add(x, err ? 0 : 1,
1473 audit_get_loginuid(current),
1474 audit_get_sessionid(current), 0);
1475
1476 if (err < 0) {
1477 x->km.state = XFRM_STATE_DEAD;
1478 __xfrm_state_put(x);
1479 goto out;
1480 }
1481
1482 if (hdr->sadb_msg_type == SADB_ADD)
1483 c.event = XFRM_MSG_NEWSA;
1484 else
1485 c.event = XFRM_MSG_UPDSA;
1486 c.seq = hdr->sadb_msg_seq;
1487 c.pid = hdr->sadb_msg_pid;
1488 km_state_notify(x, &c);
1489 out:
1490 xfrm_state_put(x);
1491 return err;
1492 }
1493
1494 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1495 {
1496 struct net *net = sock_net(sk);
1497 struct xfrm_state *x;
1498 struct km_event c;
1499 int err;
1500
1501 if (!ext_hdrs[SADB_EXT_SA-1] ||
1502 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1503 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1504 return -EINVAL;
1505
1506 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1507 if (x == NULL)
1508 return -ESRCH;
1509
1510 if ((err = security_xfrm_state_delete(x)))
1511 goto out;
1512
1513 if (xfrm_state_kern(x)) {
1514 err = -EPERM;
1515 goto out;
1516 }
1517
1518 err = xfrm_state_delete(x);
1519
1520 if (err < 0)
1521 goto out;
1522
1523 c.seq = hdr->sadb_msg_seq;
1524 c.pid = hdr->sadb_msg_pid;
1525 c.event = XFRM_MSG_DELSA;
1526 km_state_notify(x, &c);
1527 out:
1528 xfrm_audit_state_delete(x, err ? 0 : 1,
1529 audit_get_loginuid(current),
1530 audit_get_sessionid(current), 0);
1531 xfrm_state_put(x);
1532
1533 return err;
1534 }
1535
1536 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1537 {
1538 struct net *net = sock_net(sk);
1539 __u8 proto;
1540 struct sk_buff *out_skb;
1541 struct sadb_msg *out_hdr;
1542 struct xfrm_state *x;
1543
1544 if (!ext_hdrs[SADB_EXT_SA-1] ||
1545 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1546 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1547 return -EINVAL;
1548
1549 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1550 if (x == NULL)
1551 return -ESRCH;
1552
1553 out_skb = pfkey_xfrm_state2msg(x);
1554 proto = x->id.proto;
1555 xfrm_state_put(x);
1556 if (IS_ERR(out_skb))
1557 return PTR_ERR(out_skb);
1558
1559 out_hdr = (struct sadb_msg *) out_skb->data;
1560 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561 out_hdr->sadb_msg_type = SADB_GET;
1562 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1563 out_hdr->sadb_msg_errno = 0;
1564 out_hdr->sadb_msg_reserved = 0;
1565 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1566 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1567 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1568
1569 return 0;
1570 }
1571
1572 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1573 gfp_t allocation)
1574 {
1575 struct sk_buff *skb;
1576 struct sadb_msg *hdr;
1577 int len, auth_len, enc_len, i;
1578
1579 auth_len = xfrm_count_auth_supported();
1580 if (auth_len) {
1581 auth_len *= sizeof(struct sadb_alg);
1582 auth_len += sizeof(struct sadb_supported);
1583 }
1584
1585 enc_len = xfrm_count_enc_supported();
1586 if (enc_len) {
1587 enc_len *= sizeof(struct sadb_alg);
1588 enc_len += sizeof(struct sadb_supported);
1589 }
1590
1591 len = enc_len + auth_len + sizeof(struct sadb_msg);
1592
1593 skb = alloc_skb(len + 16, allocation);
1594 if (!skb)
1595 goto out_put_algs;
1596
1597 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1598 pfkey_hdr_dup(hdr, orig);
1599 hdr->sadb_msg_errno = 0;
1600 hdr->sadb_msg_len = len / sizeof(uint64_t);
1601
1602 if (auth_len) {
1603 struct sadb_supported *sp;
1604 struct sadb_alg *ap;
1605
1606 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1607 ap = (struct sadb_alg *) (sp + 1);
1608
1609 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1610 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1611
1612 for (i = 0; ; i++) {
1613 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1614 if (!aalg)
1615 break;
1616 if (aalg->available)
1617 *ap++ = aalg->desc;
1618 }
1619 }
1620
1621 if (enc_len) {
1622 struct sadb_supported *sp;
1623 struct sadb_alg *ap;
1624
1625 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1626 ap = (struct sadb_alg *) (sp + 1);
1627
1628 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1629 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1630
1631 for (i = 0; ; i++) {
1632 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1633 if (!ealg)
1634 break;
1635 if (ealg->available)
1636 *ap++ = ealg->desc;
1637 }
1638 }
1639
1640 out_put_algs:
1641 return skb;
1642 }
1643
1644 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1645 {
1646 struct pfkey_sock *pfk = pfkey_sk(sk);
1647 struct sk_buff *supp_skb;
1648
1649 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1650 return -EINVAL;
1651
1652 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1653 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1654 return -EEXIST;
1655 pfk->registered |= (1<<hdr->sadb_msg_satype);
1656 }
1657
1658 xfrm_probe_algs();
1659
1660 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1661 if (!supp_skb) {
1662 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1663 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1664
1665 return -ENOBUFS;
1666 }
1667
1668 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1669
1670 return 0;
1671 }
1672
1673 static int unicast_flush_resp(struct sock *sk, struct sadb_msg *ihdr)
1674 {
1675 struct sk_buff *skb;
1676 struct sadb_msg *hdr;
1677
1678 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1679 if (!skb)
1680 return -ENOBUFS;
1681
1682 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1683 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1684 hdr->sadb_msg_errno = (uint8_t) 0;
1685 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1686
1687 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1688 }
1689
1690 static int key_notify_sa_flush(struct km_event *c)
1691 {
1692 struct sk_buff *skb;
1693 struct sadb_msg *hdr;
1694
1695 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1696 if (!skb)
1697 return -ENOBUFS;
1698 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1699 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1700 hdr->sadb_msg_type = SADB_FLUSH;
1701 hdr->sadb_msg_seq = c->seq;
1702 hdr->sadb_msg_pid = c->pid;
1703 hdr->sadb_msg_version = PF_KEY_V2;
1704 hdr->sadb_msg_errno = (uint8_t) 0;
1705 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1706
1707 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1708
1709 return 0;
1710 }
1711
1712 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1713 {
1714 struct net *net = sock_net(sk);
1715 unsigned proto;
1716 struct km_event c;
1717 struct xfrm_audit audit_info;
1718 int err, err2;
1719
1720 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1721 if (proto == 0)
1722 return -EINVAL;
1723
1724 audit_info.loginuid = audit_get_loginuid(current);
1725 audit_info.sessionid = audit_get_sessionid(current);
1726 audit_info.secid = 0;
1727 err = xfrm_state_flush(net, proto, &audit_info);
1728 err2 = unicast_flush_resp(sk, hdr);
1729 if (err || err2) {
1730 if (err == -ESRCH) /* empty table - go quietly */
1731 err = 0;
1732 return err ? err : err2;
1733 }
1734
1735 c.data.proto = proto;
1736 c.seq = hdr->sadb_msg_seq;
1737 c.pid = hdr->sadb_msg_pid;
1738 c.event = XFRM_MSG_FLUSHSA;
1739 c.net = net;
1740 km_state_notify(NULL, &c);
1741
1742 return 0;
1743 }
1744
1745 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1746 {
1747 struct pfkey_sock *pfk = ptr;
1748 struct sk_buff *out_skb;
1749 struct sadb_msg *out_hdr;
1750
1751 if (!pfkey_can_dump(&pfk->sk))
1752 return -ENOBUFS;
1753
1754 out_skb = pfkey_xfrm_state2msg(x);
1755 if (IS_ERR(out_skb))
1756 return PTR_ERR(out_skb);
1757
1758 out_hdr = (struct sadb_msg *) out_skb->data;
1759 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1760 out_hdr->sadb_msg_type = SADB_DUMP;
1761 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1762 out_hdr->sadb_msg_errno = 0;
1763 out_hdr->sadb_msg_reserved = 0;
1764 out_hdr->sadb_msg_seq = count + 1;
1765 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1766
1767 if (pfk->dump.skb)
1768 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1769 &pfk->sk, sock_net(&pfk->sk));
1770 pfk->dump.skb = out_skb;
1771
1772 return 0;
1773 }
1774
1775 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1776 {
1777 struct net *net = sock_net(&pfk->sk);
1778 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1779 }
1780
1781 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1782 {
1783 xfrm_state_walk_done(&pfk->dump.u.state);
1784 }
1785
1786 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1787 {
1788 u8 proto;
1789 struct pfkey_sock *pfk = pfkey_sk(sk);
1790
1791 if (pfk->dump.dump != NULL)
1792 return -EBUSY;
1793
1794 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1795 if (proto == 0)
1796 return -EINVAL;
1797
1798 pfk->dump.msg_version = hdr->sadb_msg_version;
1799 pfk->dump.msg_pid = hdr->sadb_msg_pid;
1800 pfk->dump.dump = pfkey_dump_sa;
1801 pfk->dump.done = pfkey_dump_sa_done;
1802 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1803
1804 return pfkey_do_dump(pfk);
1805 }
1806
1807 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1808 {
1809 struct pfkey_sock *pfk = pfkey_sk(sk);
1810 int satype = hdr->sadb_msg_satype;
1811
1812 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1813 /* XXX we mangle packet... */
1814 hdr->sadb_msg_errno = 0;
1815 if (satype != 0 && satype != 1)
1816 return -EINVAL;
1817 pfk->promisc = satype;
1818 }
1819 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1820 return 0;
1821 }
1822
1823 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1824 {
1825 int i;
1826 u32 reqid = *(u32*)ptr;
1827
1828 for (i=0; i<xp->xfrm_nr; i++) {
1829 if (xp->xfrm_vec[i].reqid == reqid)
1830 return -EEXIST;
1831 }
1832 return 0;
1833 }
1834
1835 static u32 gen_reqid(struct net *net)
1836 {
1837 struct xfrm_policy_walk walk;
1838 u32 start;
1839 int rc;
1840 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1841
1842 start = reqid;
1843 do {
1844 ++reqid;
1845 if (reqid == 0)
1846 reqid = IPSEC_MANUAL_REQID_MAX+1;
1847 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1848 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1849 xfrm_policy_walk_done(&walk);
1850 if (rc != -EEXIST)
1851 return reqid;
1852 } while (reqid != start);
1853 return 0;
1854 }
1855
1856 static int
1857 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1858 {
1859 struct net *net = xp_net(xp);
1860 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1861 int mode;
1862
1863 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1864 return -ELOOP;
1865
1866 if (rq->sadb_x_ipsecrequest_mode == 0)
1867 return -EINVAL;
1868
1869 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1870 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1871 return -EINVAL;
1872 t->mode = mode;
1873 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1874 t->optional = 1;
1875 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1876 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1877 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1878 t->reqid = 0;
1879 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1880 return -ENOBUFS;
1881 }
1882
1883 /* addresses present only in tunnel mode */
1884 if (t->mode == XFRM_MODE_TUNNEL) {
1885 u8 *sa = (u8 *) (rq + 1);
1886 int family, socklen;
1887
1888 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1889 &t->saddr);
1890 if (!family)
1891 return -EINVAL;
1892
1893 socklen = pfkey_sockaddr_len(family);
1894 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1895 &t->id.daddr) != family)
1896 return -EINVAL;
1897 t->encap_family = family;
1898 } else
1899 t->encap_family = xp->family;
1900
1901 /* No way to set this via kame pfkey */
1902 t->allalgs = 1;
1903 xp->xfrm_nr++;
1904 return 0;
1905 }
1906
1907 static int
1908 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1909 {
1910 int err;
1911 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1912 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1913
1914 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1915 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1916 return err;
1917 len -= rq->sadb_x_ipsecrequest_len;
1918 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1919 }
1920 return 0;
1921 }
1922
1923 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1924 {
1925 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1926
1927 if (xfrm_ctx) {
1928 int len = sizeof(struct sadb_x_sec_ctx);
1929 len += xfrm_ctx->ctx_len;
1930 return PFKEY_ALIGN8(len);
1931 }
1932 return 0;
1933 }
1934
1935 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1936 {
1937 struct xfrm_tmpl *t;
1938 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1939 int socklen = 0;
1940 int i;
1941
1942 for (i=0; i<xp->xfrm_nr; i++) {
1943 t = xp->xfrm_vec + i;
1944 socklen += pfkey_sockaddr_len(t->encap_family);
1945 }
1946
1947 return sizeof(struct sadb_msg) +
1948 (sizeof(struct sadb_lifetime) * 3) +
1949 (sizeof(struct sadb_address) * 2) +
1950 (sockaddr_size * 2) +
1951 sizeof(struct sadb_x_policy) +
1952 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1953 (socklen * 2) +
1954 pfkey_xfrm_policy2sec_ctx_size(xp);
1955 }
1956
1957 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1958 {
1959 struct sk_buff *skb;
1960 int size;
1961
1962 size = pfkey_xfrm_policy2msg_size(xp);
1963
1964 skb = alloc_skb(size + 16, GFP_ATOMIC);
1965 if (skb == NULL)
1966 return ERR_PTR(-ENOBUFS);
1967
1968 return skb;
1969 }
1970
1971 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1972 {
1973 struct sadb_msg *hdr;
1974 struct sadb_address *addr;
1975 struct sadb_lifetime *lifetime;
1976 struct sadb_x_policy *pol;
1977 struct sadb_x_sec_ctx *sec_ctx;
1978 struct xfrm_sec_ctx *xfrm_ctx;
1979 int i;
1980 int size;
1981 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1982 int socklen = pfkey_sockaddr_len(xp->family);
1983
1984 size = pfkey_xfrm_policy2msg_size(xp);
1985
1986 /* call should fill header later */
1987 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1988 memset(hdr, 0, size); /* XXX do we need this ? */
1989
1990 /* src address */
1991 addr = (struct sadb_address*) skb_put(skb,
1992 sizeof(struct sadb_address)+sockaddr_size);
1993 addr->sadb_address_len =
1994 (sizeof(struct sadb_address)+sockaddr_size)/
1995 sizeof(uint64_t);
1996 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1997 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1998 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1999 addr->sadb_address_reserved = 0;
2000 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2001 xp->selector.sport,
2002 (struct sockaddr *) (addr + 1),
2003 xp->family))
2004 BUG();
2005
2006 /* dst address */
2007 addr = (struct sadb_address*) skb_put(skb,
2008 sizeof(struct sadb_address)+sockaddr_size);
2009 addr->sadb_address_len =
2010 (sizeof(struct sadb_address)+sockaddr_size)/
2011 sizeof(uint64_t);
2012 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2013 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2014 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2015 addr->sadb_address_reserved = 0;
2016
2017 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2018 (struct sockaddr *) (addr + 1),
2019 xp->family);
2020
2021 /* hard time */
2022 lifetime = (struct sadb_lifetime *) skb_put(skb,
2023 sizeof(struct sadb_lifetime));
2024 lifetime->sadb_lifetime_len =
2025 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2026 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2027 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2028 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2029 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2030 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2031 /* soft time */
2032 lifetime = (struct sadb_lifetime *) skb_put(skb,
2033 sizeof(struct sadb_lifetime));
2034 lifetime->sadb_lifetime_len =
2035 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2036 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2037 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2038 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2039 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2040 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2041 /* current time */
2042 lifetime = (struct sadb_lifetime *) skb_put(skb,
2043 sizeof(struct sadb_lifetime));
2044 lifetime->sadb_lifetime_len =
2045 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2046 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2047 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2048 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2049 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2050 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2051
2052 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2053 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2054 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2055 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2056 if (xp->action == XFRM_POLICY_ALLOW) {
2057 if (xp->xfrm_nr)
2058 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2059 else
2060 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2061 }
2062 pol->sadb_x_policy_dir = dir+1;
2063 pol->sadb_x_policy_id = xp->index;
2064 pol->sadb_x_policy_priority = xp->priority;
2065
2066 for (i=0; i<xp->xfrm_nr; i++) {
2067 struct sadb_x_ipsecrequest *rq;
2068 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2069 int req_size;
2070 int mode;
2071
2072 req_size = sizeof(struct sadb_x_ipsecrequest);
2073 if (t->mode == XFRM_MODE_TUNNEL) {
2074 socklen = pfkey_sockaddr_len(t->encap_family);
2075 req_size += socklen * 2;
2076 } else {
2077 size -= 2*socklen;
2078 }
2079 rq = (void*)skb_put(skb, req_size);
2080 pol->sadb_x_policy_len += req_size/8;
2081 memset(rq, 0, sizeof(*rq));
2082 rq->sadb_x_ipsecrequest_len = req_size;
2083 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2084 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2085 return -EINVAL;
2086 rq->sadb_x_ipsecrequest_mode = mode;
2087 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2088 if (t->reqid)
2089 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2090 if (t->optional)
2091 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2092 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2093
2094 if (t->mode == XFRM_MODE_TUNNEL) {
2095 u8 *sa = (void *)(rq + 1);
2096 pfkey_sockaddr_fill(&t->saddr, 0,
2097 (struct sockaddr *)sa,
2098 t->encap_family);
2099 pfkey_sockaddr_fill(&t->id.daddr, 0,
2100 (struct sockaddr *) (sa + socklen),
2101 t->encap_family);
2102 }
2103 }
2104
2105 /* security context */
2106 if ((xfrm_ctx = xp->security)) {
2107 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2108
2109 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2110 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2111 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2112 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2113 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2114 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2115 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2116 xfrm_ctx->ctx_len);
2117 }
2118
2119 hdr->sadb_msg_len = size / sizeof(uint64_t);
2120 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2121
2122 return 0;
2123 }
2124
2125 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2126 {
2127 struct sk_buff *out_skb;
2128 struct sadb_msg *out_hdr;
2129 int err;
2130
2131 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2132 if (IS_ERR(out_skb))
2133 return PTR_ERR(out_skb);
2134
2135 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2136 if (err < 0)
2137 return err;
2138
2139 out_hdr = (struct sadb_msg *) out_skb->data;
2140 out_hdr->sadb_msg_version = PF_KEY_V2;
2141
2142 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2143 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2144 else
2145 out_hdr->sadb_msg_type = event2poltype(c->event);
2146 out_hdr->sadb_msg_errno = 0;
2147 out_hdr->sadb_msg_seq = c->seq;
2148 out_hdr->sadb_msg_pid = c->pid;
2149 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2150 return 0;
2151
2152 }
2153
2154 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2155 {
2156 struct net *net = sock_net(sk);
2157 int err = 0;
2158 struct sadb_lifetime *lifetime;
2159 struct sadb_address *sa;
2160 struct sadb_x_policy *pol;
2161 struct xfrm_policy *xp;
2162 struct km_event c;
2163 struct sadb_x_sec_ctx *sec_ctx;
2164
2165 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2166 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2167 !ext_hdrs[SADB_X_EXT_POLICY-1])
2168 return -EINVAL;
2169
2170 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2171 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2172 return -EINVAL;
2173 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2174 return -EINVAL;
2175
2176 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2177 if (xp == NULL)
2178 return -ENOBUFS;
2179
2180 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2181 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2182 xp->priority = pol->sadb_x_policy_priority;
2183
2184 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2185 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2186 if (!xp->family) {
2187 err = -EINVAL;
2188 goto out;
2189 }
2190 xp->selector.family = xp->family;
2191 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2192 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2193 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2194 if (xp->selector.sport)
2195 xp->selector.sport_mask = htons(0xffff);
2196
2197 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2198 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2199 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2200
2201 /* Amusing, we set this twice. KAME apps appear to set same value
2202 * in both addresses.
2203 */
2204 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2205
2206 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2207 if (xp->selector.dport)
2208 xp->selector.dport_mask = htons(0xffff);
2209
2210 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2211 if (sec_ctx != NULL) {
2212 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2213
2214 if (!uctx) {
2215 err = -ENOBUFS;
2216 goto out;
2217 }
2218
2219 err = security_xfrm_policy_alloc(&xp->security, uctx);
2220 kfree(uctx);
2221
2222 if (err)
2223 goto out;
2224 }
2225
2226 xp->lft.soft_byte_limit = XFRM_INF;
2227 xp->lft.hard_byte_limit = XFRM_INF;
2228 xp->lft.soft_packet_limit = XFRM_INF;
2229 xp->lft.hard_packet_limit = XFRM_INF;
2230 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2231 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2232 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2233 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2234 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2235 }
2236 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2237 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2238 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2239 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2240 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2241 }
2242 xp->xfrm_nr = 0;
2243 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2244 (err = parse_ipsecrequests(xp, pol)) < 0)
2245 goto out;
2246
2247 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2248 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2249
2250 xfrm_audit_policy_add(xp, err ? 0 : 1,
2251 audit_get_loginuid(current),
2252 audit_get_sessionid(current), 0);
2253
2254 if (err)
2255 goto out;
2256
2257 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2258 c.event = XFRM_MSG_UPDPOLICY;
2259 else
2260 c.event = XFRM_MSG_NEWPOLICY;
2261
2262 c.seq = hdr->sadb_msg_seq;
2263 c.pid = hdr->sadb_msg_pid;
2264
2265 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2266 xfrm_pol_put(xp);
2267 return 0;
2268
2269 out:
2270 xp->walk.dead = 1;
2271 xfrm_policy_destroy(xp);
2272 return err;
2273 }
2274
2275 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2276 {
2277 struct net *net = sock_net(sk);
2278 int err;
2279 struct sadb_address *sa;
2280 struct sadb_x_policy *pol;
2281 struct xfrm_policy *xp;
2282 struct xfrm_selector sel;
2283 struct km_event c;
2284 struct sadb_x_sec_ctx *sec_ctx;
2285 struct xfrm_sec_ctx *pol_ctx = NULL;
2286
2287 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2288 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2289 !ext_hdrs[SADB_X_EXT_POLICY-1])
2290 return -EINVAL;
2291
2292 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2293 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2294 return -EINVAL;
2295
2296 memset(&sel, 0, sizeof(sel));
2297
2298 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2299 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2300 sel.prefixlen_s = sa->sadb_address_prefixlen;
2301 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2302 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2303 if (sel.sport)
2304 sel.sport_mask = htons(0xffff);
2305
2306 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2307 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2308 sel.prefixlen_d = sa->sadb_address_prefixlen;
2309 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2310 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2311 if (sel.dport)
2312 sel.dport_mask = htons(0xffff);
2313
2314 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2315 if (sec_ctx != NULL) {
2316 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2317
2318 if (!uctx)
2319 return -ENOMEM;
2320
2321 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2322 kfree(uctx);
2323 if (err)
2324 return err;
2325 }
2326
2327 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2328 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2329 1, &err);
2330 security_xfrm_policy_free(pol_ctx);
2331 if (xp == NULL)
2332 return -ENOENT;
2333
2334 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2335 audit_get_loginuid(current),
2336 audit_get_sessionid(current), 0);
2337
2338 if (err)
2339 goto out;
2340
2341 c.seq = hdr->sadb_msg_seq;
2342 c.pid = hdr->sadb_msg_pid;
2343 c.data.byid = 0;
2344 c.event = XFRM_MSG_DELPOLICY;
2345 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2346
2347 out:
2348 xfrm_pol_put(xp);
2349 return err;
2350 }
2351
2352 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2353 {
2354 int err;
2355 struct sk_buff *out_skb;
2356 struct sadb_msg *out_hdr;
2357 err = 0;
2358
2359 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2360 if (IS_ERR(out_skb)) {
2361 err = PTR_ERR(out_skb);
2362 goto out;
2363 }
2364 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2365 if (err < 0)
2366 goto out;
2367
2368 out_hdr = (struct sadb_msg *) out_skb->data;
2369 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2370 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2371 out_hdr->sadb_msg_satype = 0;
2372 out_hdr->sadb_msg_errno = 0;
2373 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2374 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2375 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2376 err = 0;
2377
2378 out:
2379 return err;
2380 }
2381
2382 #ifdef CONFIG_NET_KEY_MIGRATE
2383 static int pfkey_sockaddr_pair_size(sa_family_t family)
2384 {
2385 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2386 }
2387
2388 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2389 xfrm_address_t *saddr, xfrm_address_t *daddr,
2390 u16 *family)
2391 {
2392 int af, socklen;
2393
2394 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2395 return -EINVAL;
2396
2397 af = pfkey_sockaddr_extract(sa, saddr);
2398 if (!af)
2399 return -EINVAL;
2400
2401 socklen = pfkey_sockaddr_len(af);
2402 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2403 daddr) != af)
2404 return -EINVAL;
2405
2406 *family = af;
2407 return 0;
2408 }
2409
2410 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2411 struct xfrm_migrate *m)
2412 {
2413 int err;
2414 struct sadb_x_ipsecrequest *rq2;
2415 int mode;
2416
2417 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2418 len < rq1->sadb_x_ipsecrequest_len)
2419 return -EINVAL;
2420
2421 /* old endoints */
2422 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2423 rq1->sadb_x_ipsecrequest_len,
2424 &m->old_saddr, &m->old_daddr,
2425 &m->old_family);
2426 if (err)
2427 return err;
2428
2429 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2430 len -= rq1->sadb_x_ipsecrequest_len;
2431
2432 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2433 len < rq2->sadb_x_ipsecrequest_len)
2434 return -EINVAL;
2435
2436 /* new endpoints */
2437 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2438 rq2->sadb_x_ipsecrequest_len,
2439 &m->new_saddr, &m->new_daddr,
2440 &m->new_family);
2441 if (err)
2442 return err;
2443
2444 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2445 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2446 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2447 return -EINVAL;
2448
2449 m->proto = rq1->sadb_x_ipsecrequest_proto;
2450 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2451 return -EINVAL;
2452 m->mode = mode;
2453 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2454
2455 return ((int)(rq1->sadb_x_ipsecrequest_len +
2456 rq2->sadb_x_ipsecrequest_len));
2457 }
2458
2459 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2460 struct sadb_msg *hdr, void **ext_hdrs)
2461 {
2462 int i, len, ret, err = -EINVAL;
2463 u8 dir;
2464 struct sadb_address *sa;
2465 struct sadb_x_kmaddress *kma;
2466 struct sadb_x_policy *pol;
2467 struct sadb_x_ipsecrequest *rq;
2468 struct xfrm_selector sel;
2469 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2470 struct xfrm_kmaddress k;
2471
2472 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2473 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2474 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2475 err = -EINVAL;
2476 goto out;
2477 }
2478
2479 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2480 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2481
2482 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2483 err = -EINVAL;
2484 goto out;
2485 }
2486
2487 if (kma) {
2488 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2489 k.reserved = kma->sadb_x_kmaddress_reserved;
2490 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2491 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2492 &k.local, &k.remote, &k.family);
2493 if (ret < 0) {
2494 err = ret;
2495 goto out;
2496 }
2497 }
2498
2499 dir = pol->sadb_x_policy_dir - 1;
2500 memset(&sel, 0, sizeof(sel));
2501
2502 /* set source address info of selector */
2503 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2504 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2505 sel.prefixlen_s = sa->sadb_address_prefixlen;
2506 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2507 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2508 if (sel.sport)
2509 sel.sport_mask = htons(0xffff);
2510
2511 /* set destination address info of selector */
2512 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2513 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2514 sel.prefixlen_d = sa->sadb_address_prefixlen;
2515 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2516 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2517 if (sel.dport)
2518 sel.dport_mask = htons(0xffff);
2519
2520 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2521
2522 /* extract ipsecrequests */
2523 i = 0;
2524 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2525
2526 while (len > 0 && i < XFRM_MAX_DEPTH) {
2527 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2528 if (ret < 0) {
2529 err = ret;
2530 goto out;
2531 } else {
2532 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2533 len -= ret;
2534 i++;
2535 }
2536 }
2537
2538 if (!i || len > 0) {
2539 err = -EINVAL;
2540 goto out;
2541 }
2542
2543 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2544 kma ? &k : NULL);
2545
2546 out:
2547 return err;
2548 }
2549 #else
2550 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2551 struct sadb_msg *hdr, void **ext_hdrs)
2552 {
2553 return -ENOPROTOOPT;
2554 }
2555 #endif
2556
2557
2558 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2559 {
2560 struct net *net = sock_net(sk);
2561 unsigned int dir;
2562 int err = 0, delete;
2563 struct sadb_x_policy *pol;
2564 struct xfrm_policy *xp;
2565 struct km_event c;
2566
2567 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2568 return -EINVAL;
2569
2570 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2571 if (dir >= XFRM_POLICY_MAX)
2572 return -EINVAL;
2573
2574 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2575 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2576 dir, pol->sadb_x_policy_id, delete, &err);
2577 if (xp == NULL)
2578 return -ENOENT;
2579
2580 if (delete) {
2581 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2582 audit_get_loginuid(current),
2583 audit_get_sessionid(current), 0);
2584
2585 if (err)
2586 goto out;
2587 c.seq = hdr->sadb_msg_seq;
2588 c.pid = hdr->sadb_msg_pid;
2589 c.data.byid = 1;
2590 c.event = XFRM_MSG_DELPOLICY;
2591 km_policy_notify(xp, dir, &c);
2592 } else {
2593 err = key_pol_get_resp(sk, xp, hdr, dir);
2594 }
2595
2596 out:
2597 xfrm_pol_put(xp);
2598 return err;
2599 }
2600
2601 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2602 {
2603 struct pfkey_sock *pfk = ptr;
2604 struct sk_buff *out_skb;
2605 struct sadb_msg *out_hdr;
2606 int err;
2607
2608 if (!pfkey_can_dump(&pfk->sk))
2609 return -ENOBUFS;
2610
2611 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2612 if (IS_ERR(out_skb))
2613 return PTR_ERR(out_skb);
2614
2615 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2616 if (err < 0)
2617 return err;
2618
2619 out_hdr = (struct sadb_msg *) out_skb->data;
2620 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2621 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2622 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2623 out_hdr->sadb_msg_errno = 0;
2624 out_hdr->sadb_msg_seq = count + 1;
2625 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2626
2627 if (pfk->dump.skb)
2628 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2629 &pfk->sk, sock_net(&pfk->sk));
2630 pfk->dump.skb = out_skb;
2631
2632 return 0;
2633 }
2634
2635 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2636 {
2637 struct net *net = sock_net(&pfk->sk);
2638 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2639 }
2640
2641 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2642 {
2643 xfrm_policy_walk_done(&pfk->dump.u.policy);
2644 }
2645
2646 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2647 {
2648 struct pfkey_sock *pfk = pfkey_sk(sk);
2649
2650 if (pfk->dump.dump != NULL)
2651 return -EBUSY;
2652
2653 pfk->dump.msg_version = hdr->sadb_msg_version;
2654 pfk->dump.msg_pid = hdr->sadb_msg_pid;
2655 pfk->dump.dump = pfkey_dump_sp;
2656 pfk->dump.done = pfkey_dump_sp_done;
2657 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2658
2659 return pfkey_do_dump(pfk);
2660 }
2661
2662 static int key_notify_policy_flush(struct km_event *c)
2663 {
2664 struct sk_buff *skb_out;
2665 struct sadb_msg *hdr;
2666
2667 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2668 if (!skb_out)
2669 return -ENOBUFS;
2670 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2671 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2672 hdr->sadb_msg_seq = c->seq;
2673 hdr->sadb_msg_pid = c->pid;
2674 hdr->sadb_msg_version = PF_KEY_V2;
2675 hdr->sadb_msg_errno = (uint8_t) 0;
2676 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2677 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2678 return 0;
2679
2680 }
2681
2682 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2683 {
2684 struct net *net = sock_net(sk);
2685 struct km_event c;
2686 struct xfrm_audit audit_info;
2687 int err, err2;
2688
2689 audit_info.loginuid = audit_get_loginuid(current);
2690 audit_info.sessionid = audit_get_sessionid(current);
2691 audit_info.secid = 0;
2692 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2693 err2 = unicast_flush_resp(sk, hdr);
2694 if (err || err2) {
2695 if (err == -ESRCH) /* empty table - old silent behavior */
2696 return 0;
2697 return err;
2698 }
2699
2700 c.data.type = XFRM_POLICY_TYPE_MAIN;
2701 c.event = XFRM_MSG_FLUSHPOLICY;
2702 c.pid = hdr->sadb_msg_pid;
2703 c.seq = hdr->sadb_msg_seq;
2704 c.net = net;
2705 km_policy_notify(NULL, 0, &c);
2706
2707 return 0;
2708 }
2709
2710 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2711 struct sadb_msg *hdr, void **ext_hdrs);
2712 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2713 [SADB_RESERVED] = pfkey_reserved,
2714 [SADB_GETSPI] = pfkey_getspi,
2715 [SADB_UPDATE] = pfkey_add,
2716 [SADB_ADD] = pfkey_add,
2717 [SADB_DELETE] = pfkey_delete,
2718 [SADB_GET] = pfkey_get,
2719 [SADB_ACQUIRE] = pfkey_acquire,
2720 [SADB_REGISTER] = pfkey_register,
2721 [SADB_EXPIRE] = NULL,
2722 [SADB_FLUSH] = pfkey_flush,
2723 [SADB_DUMP] = pfkey_dump,
2724 [SADB_X_PROMISC] = pfkey_promisc,
2725 [SADB_X_PCHANGE] = NULL,
2726 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2727 [SADB_X_SPDADD] = pfkey_spdadd,
2728 [SADB_X_SPDDELETE] = pfkey_spddelete,
2729 [SADB_X_SPDGET] = pfkey_spdget,
2730 [SADB_X_SPDACQUIRE] = NULL,
2731 [SADB_X_SPDDUMP] = pfkey_spddump,
2732 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2733 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2734 [SADB_X_SPDDELETE2] = pfkey_spdget,
2735 [SADB_X_MIGRATE] = pfkey_migrate,
2736 };
2737
2738 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2739 {
2740 void *ext_hdrs[SADB_EXT_MAX];
2741 int err;
2742
2743 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2744 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2745
2746 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2747 err = parse_exthdrs(skb, hdr, ext_hdrs);
2748 if (!err) {
2749 err = -EOPNOTSUPP;
2750 if (pfkey_funcs[hdr->sadb_msg_type])
2751 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2752 }
2753 return err;
2754 }
2755
2756 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2757 {
2758 struct sadb_msg *hdr = NULL;
2759
2760 if (skb->len < sizeof(*hdr)) {
2761 *errp = -EMSGSIZE;
2762 } else {
2763 hdr = (struct sadb_msg *) skb->data;
2764 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2765 hdr->sadb_msg_reserved != 0 ||
2766 (hdr->sadb_msg_type <= SADB_RESERVED ||
2767 hdr->sadb_msg_type > SADB_MAX)) {
2768 hdr = NULL;
2769 *errp = -EINVAL;
2770 } else if (hdr->sadb_msg_len != (skb->len /
2771 sizeof(uint64_t)) ||
2772 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2773 sizeof(uint64_t))) {
2774 hdr = NULL;
2775 *errp = -EMSGSIZE;
2776 } else {
2777 *errp = 0;
2778 }
2779 }
2780 return hdr;
2781 }
2782
2783 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2784 {
2785 unsigned int id = d->desc.sadb_alg_id;
2786
2787 if (id >= sizeof(t->aalgos) * 8)
2788 return 0;
2789
2790 return (t->aalgos >> id) & 1;
2791 }
2792
2793 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2794 {
2795 unsigned int id = d->desc.sadb_alg_id;
2796
2797 if (id >= sizeof(t->ealgos) * 8)
2798 return 0;
2799
2800 return (t->ealgos >> id) & 1;
2801 }
2802
2803 static int count_ah_combs(struct xfrm_tmpl *t)
2804 {
2805 int i, sz = 0;
2806
2807 for (i = 0; ; i++) {
2808 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2809 if (!aalg)
2810 break;
2811 if (aalg_tmpl_set(t, aalg) && aalg->available)
2812 sz += sizeof(struct sadb_comb);
2813 }
2814 return sz + sizeof(struct sadb_prop);
2815 }
2816
2817 static int count_esp_combs(struct xfrm_tmpl *t)
2818 {
2819 int i, k, sz = 0;
2820
2821 for (i = 0; ; i++) {
2822 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2823 if (!ealg)
2824 break;
2825
2826 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2827 continue;
2828
2829 for (k = 1; ; k++) {
2830 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2831 if (!aalg)
2832 break;
2833
2834 if (aalg_tmpl_set(t, aalg) && aalg->available)
2835 sz += sizeof(struct sadb_comb);
2836 }
2837 }
2838 return sz + sizeof(struct sadb_prop);
2839 }
2840
2841 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2842 {
2843 struct sadb_prop *p;
2844 int i;
2845
2846 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2847 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2848 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2849 p->sadb_prop_replay = 32;
2850 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2851
2852 for (i = 0; ; i++) {
2853 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2854 if (!aalg)
2855 break;
2856
2857 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2858 struct sadb_comb *c;
2859 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2860 memset(c, 0, sizeof(*c));
2861 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2862 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2863 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2864 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2865 c->sadb_comb_hard_addtime = 24*60*60;
2866 c->sadb_comb_soft_addtime = 20*60*60;
2867 c->sadb_comb_hard_usetime = 8*60*60;
2868 c->sadb_comb_soft_usetime = 7*60*60;
2869 }
2870 }
2871 }
2872
2873 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2874 {
2875 struct sadb_prop *p;
2876 int i, k;
2877
2878 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2879 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2880 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2881 p->sadb_prop_replay = 32;
2882 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2883
2884 for (i=0; ; i++) {
2885 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2886 if (!ealg)
2887 break;
2888
2889 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2890 continue;
2891
2892 for (k = 1; ; k++) {
2893 struct sadb_comb *c;
2894 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2895 if (!aalg)
2896 break;
2897 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2898 continue;
2899 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2900 memset(c, 0, sizeof(*c));
2901 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2902 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2903 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2904 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2905 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2906 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2907 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2908 c->sadb_comb_hard_addtime = 24*60*60;
2909 c->sadb_comb_soft_addtime = 20*60*60;
2910 c->sadb_comb_hard_usetime = 8*60*60;
2911 c->sadb_comb_soft_usetime = 7*60*60;
2912 }
2913 }
2914 }
2915
2916 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2917 {
2918 return 0;
2919 }
2920
2921 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2922 {
2923 struct sk_buff *out_skb;
2924 struct sadb_msg *out_hdr;
2925 int hard;
2926 int hsc;
2927
2928 hard = c->data.hard;
2929 if (hard)
2930 hsc = 2;
2931 else
2932 hsc = 1;
2933
2934 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2935 if (IS_ERR(out_skb))
2936 return PTR_ERR(out_skb);
2937
2938 out_hdr = (struct sadb_msg *) out_skb->data;
2939 out_hdr->sadb_msg_version = PF_KEY_V2;
2940 out_hdr->sadb_msg_type = SADB_EXPIRE;
2941 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2942 out_hdr->sadb_msg_errno = 0;
2943 out_hdr->sadb_msg_reserved = 0;
2944 out_hdr->sadb_msg_seq = 0;
2945 out_hdr->sadb_msg_pid = 0;
2946
2947 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2948 return 0;
2949 }
2950
2951 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2952 {
2953 struct net *net = x ? xs_net(x) : c->net;
2954 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2955
2956 if (atomic_read(&net_pfkey->socks_nr) == 0)
2957 return 0;
2958
2959 switch (c->event) {
2960 case XFRM_MSG_EXPIRE:
2961 return key_notify_sa_expire(x, c);
2962 case XFRM_MSG_DELSA:
2963 case XFRM_MSG_NEWSA:
2964 case XFRM_MSG_UPDSA:
2965 return key_notify_sa(x, c);
2966 case XFRM_MSG_FLUSHSA:
2967 return key_notify_sa_flush(c);
2968 case XFRM_MSG_NEWAE: /* not yet supported */
2969 break;
2970 default:
2971 printk("pfkey: Unknown SA event %d\n", c->event);
2972 break;
2973 }
2974
2975 return 0;
2976 }
2977
2978 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2979 {
2980 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2981 return 0;
2982
2983 switch (c->event) {
2984 case XFRM_MSG_POLEXPIRE:
2985 return key_notify_policy_expire(xp, c);
2986 case XFRM_MSG_DELPOLICY:
2987 case XFRM_MSG_NEWPOLICY:
2988 case XFRM_MSG_UPDPOLICY:
2989 return key_notify_policy(xp, dir, c);
2990 case XFRM_MSG_FLUSHPOLICY:
2991 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2992 break;
2993 return key_notify_policy_flush(c);
2994 default:
2995 printk("pfkey: Unknown policy event %d\n", c->event);
2996 break;
2997 }
2998
2999 return 0;
3000 }
3001
3002 static u32 get_acqseq(void)
3003 {
3004 u32 res;
3005 static atomic_t acqseq;
3006
3007 do {
3008 res = atomic_inc_return(&acqseq);
3009 } while (!res);
3010 return res;
3011 }
3012
3013 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3014 {
3015 struct sk_buff *skb;
3016 struct sadb_msg *hdr;
3017 struct sadb_address *addr;
3018 struct sadb_x_policy *pol;
3019 int sockaddr_size;
3020 int size;
3021 struct sadb_x_sec_ctx *sec_ctx;
3022 struct xfrm_sec_ctx *xfrm_ctx;
3023 int ctx_size = 0;
3024
3025 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3026 if (!sockaddr_size)
3027 return -EINVAL;
3028
3029 size = sizeof(struct sadb_msg) +
3030 (sizeof(struct sadb_address) * 2) +
3031 (sockaddr_size * 2) +
3032 sizeof(struct sadb_x_policy);
3033
3034 if (x->id.proto == IPPROTO_AH)
3035 size += count_ah_combs(t);
3036 else if (x->id.proto == IPPROTO_ESP)
3037 size += count_esp_combs(t);
3038
3039 if ((xfrm_ctx = x->security)) {
3040 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3041 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3042 }
3043
3044 skb = alloc_skb(size + 16, GFP_ATOMIC);
3045 if (skb == NULL)
3046 return -ENOMEM;
3047
3048 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3049 hdr->sadb_msg_version = PF_KEY_V2;
3050 hdr->sadb_msg_type = SADB_ACQUIRE;
3051 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3052 hdr->sadb_msg_len = size / sizeof(uint64_t);
3053 hdr->sadb_msg_errno = 0;
3054 hdr->sadb_msg_reserved = 0;
3055 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3056 hdr->sadb_msg_pid = 0;
3057
3058 /* src address */
3059 addr = (struct sadb_address*) skb_put(skb,
3060 sizeof(struct sadb_address)+sockaddr_size);
3061 addr->sadb_address_len =
3062 (sizeof(struct sadb_address)+sockaddr_size)/
3063 sizeof(uint64_t);
3064 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3065 addr->sadb_address_proto = 0;
3066 addr->sadb_address_reserved = 0;
3067 addr->sadb_address_prefixlen =
3068 pfkey_sockaddr_fill(&x->props.saddr, 0,
3069 (struct sockaddr *) (addr + 1),
3070 x->props.family);
3071 if (!addr->sadb_address_prefixlen)
3072 BUG();
3073
3074 /* dst address */
3075 addr = (struct sadb_address*) skb_put(skb,
3076 sizeof(struct sadb_address)+sockaddr_size);
3077 addr->sadb_address_len =
3078 (sizeof(struct sadb_address)+sockaddr_size)/
3079 sizeof(uint64_t);
3080 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3081 addr->sadb_address_proto = 0;
3082 addr->sadb_address_reserved = 0;
3083 addr->sadb_address_prefixlen =
3084 pfkey_sockaddr_fill(&x->id.daddr, 0,
3085 (struct sockaddr *) (addr + 1),
3086 x->props.family);
3087 if (!addr->sadb_address_prefixlen)
3088 BUG();
3089
3090 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3091 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3092 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3093 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3094 pol->sadb_x_policy_dir = dir+1;
3095 pol->sadb_x_policy_id = xp->index;
3096
3097 /* Set sadb_comb's. */
3098 if (x->id.proto == IPPROTO_AH)
3099 dump_ah_combs(skb, t);
3100 else if (x->id.proto == IPPROTO_ESP)
3101 dump_esp_combs(skb, t);
3102
3103 /* security context */
3104 if (xfrm_ctx) {
3105 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3106 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3107 sec_ctx->sadb_x_sec_len =
3108 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3109 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3110 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3111 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3112 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3113 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3114 xfrm_ctx->ctx_len);
3115 }
3116
3117 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3118 }
3119
3120 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3121 u8 *data, int len, int *dir)
3122 {
3123 struct net *net = sock_net(sk);
3124 struct xfrm_policy *xp;
3125 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3126 struct sadb_x_sec_ctx *sec_ctx;
3127
3128 switch (sk->sk_family) {
3129 case AF_INET:
3130 if (opt != IP_IPSEC_POLICY) {
3131 *dir = -EOPNOTSUPP;
3132 return NULL;
3133 }
3134 break;
3135 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3136 case AF_INET6:
3137 if (opt != IPV6_IPSEC_POLICY) {
3138 *dir = -EOPNOTSUPP;
3139 return NULL;
3140 }
3141 break;
3142 #endif
3143 default:
3144 *dir = -EINVAL;
3145 return NULL;
3146 }
3147
3148 *dir = -EINVAL;
3149
3150 if (len < sizeof(struct sadb_x_policy) ||
3151 pol->sadb_x_policy_len*8 > len ||
3152 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3153 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3154 return NULL;
3155
3156 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3157 if (xp == NULL) {
3158 *dir = -ENOBUFS;
3159 return NULL;
3160 }
3161
3162 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3163 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3164
3165 xp->lft.soft_byte_limit = XFRM_INF;
3166 xp->lft.hard_byte_limit = XFRM_INF;
3167 xp->lft.soft_packet_limit = XFRM_INF;
3168 xp->lft.hard_packet_limit = XFRM_INF;
3169 xp->family = sk->sk_family;
3170
3171 xp->xfrm_nr = 0;
3172 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3173 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3174 goto out;
3175
3176 /* security context too */
3177 if (len >= (pol->sadb_x_policy_len*8 +
3178 sizeof(struct sadb_x_sec_ctx))) {
3179 char *p = (char *)pol;
3180 struct xfrm_user_sec_ctx *uctx;
3181
3182 p += pol->sadb_x_policy_len*8;
3183 sec_ctx = (struct sadb_x_sec_ctx *)p;
3184 if (len < pol->sadb_x_policy_len*8 +
3185 sec_ctx->sadb_x_sec_len) {
3186 *dir = -EINVAL;
3187 goto out;
3188 }
3189 if ((*dir = verify_sec_ctx_len(p)))
3190 goto out;
3191 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3192 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3193 kfree(uctx);
3194
3195 if (*dir)
3196 goto out;
3197 }
3198
3199 *dir = pol->sadb_x_policy_dir-1;
3200 return xp;
3201
3202 out:
3203 xp->walk.dead = 1;
3204 xfrm_policy_destroy(xp);
3205 return NULL;
3206 }
3207
3208 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3209 {
3210 struct sk_buff *skb;
3211 struct sadb_msg *hdr;
3212 struct sadb_sa *sa;
3213 struct sadb_address *addr;
3214 struct sadb_x_nat_t_port *n_port;
3215 int sockaddr_size;
3216 int size;
3217 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3218 struct xfrm_encap_tmpl *natt = NULL;
3219
3220 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3221 if (!sockaddr_size)
3222 return -EINVAL;
3223
3224 if (!satype)
3225 return -EINVAL;
3226
3227 if (!x->encap)
3228 return -EINVAL;
3229
3230 natt = x->encap;
3231
3232 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3233 *
3234 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3235 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3236 */
3237
3238 size = sizeof(struct sadb_msg) +
3239 sizeof(struct sadb_sa) +
3240 (sizeof(struct sadb_address) * 2) +
3241 (sockaddr_size * 2) +
3242 (sizeof(struct sadb_x_nat_t_port) * 2);
3243
3244 skb = alloc_skb(size + 16, GFP_ATOMIC);
3245 if (skb == NULL)
3246 return -ENOMEM;
3247
3248 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3249 hdr->sadb_msg_version = PF_KEY_V2;
3250 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3251 hdr->sadb_msg_satype = satype;
3252 hdr->sadb_msg_len = size / sizeof(uint64_t);
3253 hdr->sadb_msg_errno = 0;
3254 hdr->sadb_msg_reserved = 0;
3255 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3256 hdr->sadb_msg_pid = 0;
3257
3258 /* SA */
3259 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3260 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3261 sa->sadb_sa_exttype = SADB_EXT_SA;
3262 sa->sadb_sa_spi = x->id.spi;
3263 sa->sadb_sa_replay = 0;
3264 sa->sadb_sa_state = 0;
3265 sa->sadb_sa_auth = 0;
3266 sa->sadb_sa_encrypt = 0;
3267 sa->sadb_sa_flags = 0;
3268
3269 /* ADDRESS_SRC (old addr) */
3270 addr = (struct sadb_address*)
3271 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3272 addr->sadb_address_len =
3273 (sizeof(struct sadb_address)+sockaddr_size)/
3274 sizeof(uint64_t);
3275 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3276 addr->sadb_address_proto = 0;
3277 addr->sadb_address_reserved = 0;
3278 addr->sadb_address_prefixlen =
3279 pfkey_sockaddr_fill(&x->props.saddr, 0,
3280 (struct sockaddr *) (addr + 1),
3281 x->props.family);
3282 if (!addr->sadb_address_prefixlen)
3283 BUG();
3284
3285 /* NAT_T_SPORT (old port) */
3286 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3287 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3288 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3289 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3290 n_port->sadb_x_nat_t_port_reserved = 0;
3291
3292 /* ADDRESS_DST (new addr) */
3293 addr = (struct sadb_address*)
3294 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3295 addr->sadb_address_len =
3296 (sizeof(struct sadb_address)+sockaddr_size)/
3297 sizeof(uint64_t);
3298 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3299 addr->sadb_address_proto = 0;
3300 addr->sadb_address_reserved = 0;
3301 addr->sadb_address_prefixlen =
3302 pfkey_sockaddr_fill(ipaddr, 0,
3303 (struct sockaddr *) (addr + 1),
3304 x->props.family);
3305 if (!addr->sadb_address_prefixlen)
3306 BUG();
3307
3308 /* NAT_T_DPORT (new port) */
3309 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3310 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3311 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3312 n_port->sadb_x_nat_t_port_port = sport;
3313 n_port->sadb_x_nat_t_port_reserved = 0;
3314
3315 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3316 }
3317
3318 #ifdef CONFIG_NET_KEY_MIGRATE
3319 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3320 struct xfrm_selector *sel)
3321 {
3322 struct sadb_address *addr;
3323 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3324 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3325 addr->sadb_address_exttype = type;
3326 addr->sadb_address_proto = sel->proto;
3327 addr->sadb_address_reserved = 0;
3328
3329 switch (type) {
3330 case SADB_EXT_ADDRESS_SRC:
3331 addr->sadb_address_prefixlen = sel->prefixlen_s;
3332 pfkey_sockaddr_fill(&sel->saddr, 0,
3333 (struct sockaddr *)(addr + 1),
3334 sel->family);
3335 break;
3336 case SADB_EXT_ADDRESS_DST:
3337 addr->sadb_address_prefixlen = sel->prefixlen_d;
3338 pfkey_sockaddr_fill(&sel->daddr, 0,
3339 (struct sockaddr *)(addr + 1),
3340 sel->family);
3341 break;
3342 default:
3343 return -EINVAL;
3344 }
3345
3346 return 0;
3347 }
3348
3349
3350 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3351 {
3352 struct sadb_x_kmaddress *kma;
3353 u8 *sa;
3354 int family = k->family;
3355 int socklen = pfkey_sockaddr_len(family);
3356 int size_req;
3357
3358 size_req = (sizeof(struct sadb_x_kmaddress) +
3359 pfkey_sockaddr_pair_size(family));
3360
3361 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3362 memset(kma, 0, size_req);
3363 kma->sadb_x_kmaddress_len = size_req / 8;
3364 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3365 kma->sadb_x_kmaddress_reserved = k->reserved;
3366
3367 sa = (u8 *)(kma + 1);
3368 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3369 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3370 return -EINVAL;
3371
3372 return 0;
3373 }
3374
3375 static int set_ipsecrequest(struct sk_buff *skb,
3376 uint8_t proto, uint8_t mode, int level,
3377 uint32_t reqid, uint8_t family,
3378 xfrm_address_t *src, xfrm_address_t *dst)
3379 {
3380 struct sadb_x_ipsecrequest *rq;
3381 u8 *sa;
3382 int socklen = pfkey_sockaddr_len(family);
3383 int size_req;
3384
3385 size_req = sizeof(struct sadb_x_ipsecrequest) +
3386 pfkey_sockaddr_pair_size(family);
3387
3388 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3389 memset(rq, 0, size_req);
3390 rq->sadb_x_ipsecrequest_len = size_req;
3391 rq->sadb_x_ipsecrequest_proto = proto;
3392 rq->sadb_x_ipsecrequest_mode = mode;
3393 rq->sadb_x_ipsecrequest_level = level;
3394 rq->sadb_x_ipsecrequest_reqid = reqid;
3395
3396 sa = (u8 *) (rq + 1);
3397 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3398 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3399 return -EINVAL;
3400
3401 return 0;
3402 }
3403 #endif
3404
3405 #ifdef CONFIG_NET_KEY_MIGRATE
3406 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3407 struct xfrm_migrate *m, int num_bundles,
3408 struct xfrm_kmaddress *k)
3409 {
3410 int i;
3411 int sasize_sel;
3412 int size = 0;
3413 int size_pol = 0;
3414 struct sk_buff *skb;
3415 struct sadb_msg *hdr;
3416 struct sadb_x_policy *pol;
3417 struct xfrm_migrate *mp;
3418
3419 if (type != XFRM_POLICY_TYPE_MAIN)
3420 return 0;
3421
3422 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3423 return -EINVAL;
3424
3425 if (k != NULL) {
3426 /* addresses for KM */
3427 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3428 pfkey_sockaddr_pair_size(k->family));
3429 }
3430
3431 /* selector */
3432 sasize_sel = pfkey_sockaddr_size(sel->family);
3433 if (!sasize_sel)
3434 return -EINVAL;
3435 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3436
3437 /* policy info */
3438 size_pol += sizeof(struct sadb_x_policy);
3439
3440 /* ipsecrequests */
3441 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3442 /* old locator pair */
3443 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3444 pfkey_sockaddr_pair_size(mp->old_family);
3445 /* new locator pair */
3446 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3447 pfkey_sockaddr_pair_size(mp->new_family);
3448 }
3449
3450 size += sizeof(struct sadb_msg) + size_pol;
3451
3452 /* alloc buffer */
3453 skb = alloc_skb(size, GFP_ATOMIC);
3454 if (skb == NULL)
3455 return -ENOMEM;
3456
3457 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3458 hdr->sadb_msg_version = PF_KEY_V2;
3459 hdr->sadb_msg_type = SADB_X_MIGRATE;
3460 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3461 hdr->sadb_msg_len = size / 8;
3462 hdr->sadb_msg_errno = 0;
3463 hdr->sadb_msg_reserved = 0;
3464 hdr->sadb_msg_seq = 0;
3465 hdr->sadb_msg_pid = 0;
3466
3467 /* Addresses to be used by KM for negotiation, if ext is available */
3468 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3469 return -EINVAL;
3470
3471 /* selector src */
3472 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3473
3474 /* selector dst */
3475 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3476
3477 /* policy information */
3478 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3479 pol->sadb_x_policy_len = size_pol / 8;
3480 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3481 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3482 pol->sadb_x_policy_dir = dir + 1;
3483 pol->sadb_x_policy_id = 0;
3484 pol->sadb_x_policy_priority = 0;
3485
3486 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3487 /* old ipsecrequest */
3488 int mode = pfkey_mode_from_xfrm(mp->mode);
3489 if (mode < 0)
3490 goto err;
3491 if (set_ipsecrequest(skb, mp->proto, mode,
3492 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3493 mp->reqid, mp->old_family,
3494 &mp->old_saddr, &mp->old_daddr) < 0)
3495 goto err;
3496
3497 /* new ipsecrequest */
3498 if (set_ipsecrequest(skb, mp->proto, mode,
3499 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3500 mp->reqid, mp->new_family,
3501 &mp->new_saddr, &mp->new_daddr) < 0)
3502 goto err;
3503 }
3504
3505 /* broadcast migrate message to sockets */
3506 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3507
3508 return 0;
3509
3510 err:
3511 kfree_skb(skb);
3512 return -EINVAL;
3513 }
3514 #else
3515 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3516 struct xfrm_migrate *m, int num_bundles,
3517 struct xfrm_kmaddress *k)
3518 {
3519 return -ENOPROTOOPT;
3520 }
3521 #endif
3522
3523 static int pfkey_sendmsg(struct kiocb *kiocb,
3524 struct socket *sock, struct msghdr *msg, size_t len)
3525 {
3526 struct sock *sk = sock->sk;
3527 struct sk_buff *skb = NULL;
3528 struct sadb_msg *hdr = NULL;
3529 int err;
3530
3531 err = -EOPNOTSUPP;
3532 if (msg->msg_flags & MSG_OOB)
3533 goto out;
3534
3535 err = -EMSGSIZE;
3536 if ((unsigned)len > sk->sk_sndbuf - 32)
3537 goto out;
3538
3539 err = -ENOBUFS;
3540 skb = alloc_skb(len, GFP_KERNEL);
3541 if (skb == NULL)
3542 goto out;
3543
3544 err = -EFAULT;
3545 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3546 goto out;
3547
3548 hdr = pfkey_get_base_msg(skb, &err);
3549 if (!hdr)
3550 goto out;
3551
3552 mutex_lock(&xfrm_cfg_mutex);
3553 err = pfkey_process(sk, skb, hdr);
3554 mutex_unlock(&xfrm_cfg_mutex);
3555
3556 out:
3557 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3558 err = 0;
3559 kfree_skb(skb);
3560
3561 return err ? : len;
3562 }
3563
3564 static int pfkey_recvmsg(struct kiocb *kiocb,
3565 struct socket *sock, struct msghdr *msg, size_t len,
3566 int flags)
3567 {
3568 struct sock *sk = sock->sk;
3569 struct pfkey_sock *pfk = pfkey_sk(sk);
3570 struct sk_buff *skb;
3571 int copied, err;
3572
3573 err = -EINVAL;
3574 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3575 goto out;
3576
3577 msg->msg_namelen = 0;
3578 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3579 if (skb == NULL)
3580 goto out;
3581
3582 copied = skb->len;
3583 if (copied > len) {
3584 msg->msg_flags |= MSG_TRUNC;
3585 copied = len;
3586 }
3587
3588 skb_reset_transport_header(skb);
3589 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3590 if (err)
3591 goto out_free;
3592
3593 sock_recv_ts_and_drops(msg, sk, skb);
3594
3595 err = (flags & MSG_TRUNC) ? skb->len : copied;
3596
3597 if (pfk->dump.dump != NULL &&
3598 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3599 pfkey_do_dump(pfk);
3600
3601 out_free:
3602 skb_free_datagram(sk, skb);
3603 out:
3604 return err;
3605 }
3606
3607 static const struct proto_ops pfkey_ops = {
3608 .family = PF_KEY,
3609 .owner = THIS_MODULE,
3610 /* Operations that make no sense on pfkey sockets. */
3611 .bind = sock_no_bind,
3612 .connect = sock_no_connect,
3613 .socketpair = sock_no_socketpair,
3614 .accept = sock_no_accept,
3615 .getname = sock_no_getname,
3616 .ioctl = sock_no_ioctl,
3617 .listen = sock_no_listen,
3618 .shutdown = sock_no_shutdown,
3619 .setsockopt = sock_no_setsockopt,
3620 .getsockopt = sock_no_getsockopt,
3621 .mmap = sock_no_mmap,
3622 .sendpage = sock_no_sendpage,
3623
3624 /* Now the operations that really occur. */
3625 .release = pfkey_release,
3626 .poll = datagram_poll,
3627 .sendmsg = pfkey_sendmsg,
3628 .recvmsg = pfkey_recvmsg,
3629 };
3630
3631 static const struct net_proto_family pfkey_family_ops = {
3632 .family = PF_KEY,
3633 .create = pfkey_create,
3634 .owner = THIS_MODULE,
3635 };
3636
3637 #ifdef CONFIG_PROC_FS
3638 static int pfkey_seq_show(struct seq_file *f, void *v)
3639 {
3640 struct sock *s = sk_entry(v);
3641
3642 if (v == SEQ_START_TOKEN)
3643 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3644 else
3645 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3646 s,
3647 atomic_read(&s->sk_refcnt),
3648 sk_rmem_alloc_get(s),
3649 sk_wmem_alloc_get(s),
3650 sock_i_uid(s),
3651 sock_i_ino(s)
3652 );
3653 return 0;
3654 }
3655
3656 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3657 {
3658 struct net *net = seq_file_net(f);
3659 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3660
3661 rcu_read_lock();
3662 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3663 }
3664
3665 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3666 {
3667 struct net *net = seq_file_net(f);
3668 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3669
3670 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3671 }
3672
3673 static void pfkey_seq_stop(struct seq_file *f, void *v)
3674 {
3675 rcu_read_unlock();
3676 }
3677
3678 static const struct seq_operations pfkey_seq_ops = {
3679 .start = pfkey_seq_start,
3680 .next = pfkey_seq_next,
3681 .stop = pfkey_seq_stop,
3682 .show = pfkey_seq_show,
3683 };
3684
3685 static int pfkey_seq_open(struct inode *inode, struct file *file)
3686 {
3687 return seq_open_net(inode, file, &pfkey_seq_ops,
3688 sizeof(struct seq_net_private));
3689 }
3690
3691 static const struct file_operations pfkey_proc_ops = {
3692 .open = pfkey_seq_open,
3693 .read = seq_read,
3694 .llseek = seq_lseek,
3695 .release = seq_release_net,
3696 };
3697
3698 static int __net_init pfkey_init_proc(struct net *net)
3699 {
3700 struct proc_dir_entry *e;
3701
3702 e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3703 if (e == NULL)
3704 return -ENOMEM;
3705
3706 return 0;
3707 }
3708
3709 static void __net_exit pfkey_exit_proc(struct net *net)
3710 {
3711 proc_net_remove(net, "pfkey");
3712 }
3713 #else
3714 static inline int pfkey_init_proc(struct net *net)
3715 {
3716 return 0;
3717 }
3718
3719 static inline void pfkey_exit_proc(struct net *net)
3720 {
3721 }
3722 #endif
3723
3724 static struct xfrm_mgr pfkeyv2_mgr =
3725 {
3726 .id = "pfkeyv2",
3727 .notify = pfkey_send_notify,
3728 .acquire = pfkey_send_acquire,
3729 .compile_policy = pfkey_compile_policy,
3730 .new_mapping = pfkey_send_new_mapping,
3731 .notify_policy = pfkey_send_policy_notify,
3732 .migrate = pfkey_send_migrate,
3733 };
3734
3735 static int __net_init pfkey_net_init(struct net *net)
3736 {
3737 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3738 int rv;
3739
3740 INIT_HLIST_HEAD(&net_pfkey->table);
3741 atomic_set(&net_pfkey->socks_nr, 0);
3742
3743 rv = pfkey_init_proc(net);
3744
3745 return rv;
3746 }
3747
3748 static void __net_exit pfkey_net_exit(struct net *net)
3749 {
3750 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3751
3752 pfkey_exit_proc(net);
3753 BUG_ON(!hlist_empty(&net_pfkey->table));
3754 }
3755
3756 static struct pernet_operations pfkey_net_ops = {
3757 .init = pfkey_net_init,
3758 .exit = pfkey_net_exit,
3759 .id = &pfkey_net_id,
3760 .size = sizeof(struct netns_pfkey),
3761 };
3762
3763 static void __exit ipsec_pfkey_exit(void)
3764 {
3765 xfrm_unregister_km(&pfkeyv2_mgr);
3766 sock_unregister(PF_KEY);
3767 unregister_pernet_subsys(&pfkey_net_ops);
3768 proto_unregister(&key_proto);
3769 }
3770
3771 static int __init ipsec_pfkey_init(void)
3772 {
3773 int err = proto_register(&key_proto, 0);
3774
3775 if (err != 0)
3776 goto out;
3777
3778 err = register_pernet_subsys(&pfkey_net_ops);
3779 if (err != 0)
3780 goto out_unregister_key_proto;
3781 err = sock_register(&pfkey_family_ops);
3782 if (err != 0)
3783 goto out_unregister_pernet;
3784 err = xfrm_register_km(&pfkeyv2_mgr);
3785 if (err != 0)
3786 goto out_sock_unregister;
3787 out:
3788 return err;
3789
3790 out_sock_unregister:
3791 sock_unregister(PF_KEY);
3792 out_unregister_pernet:
3793 unregister_pernet_subsys(&pfkey_net_ops);
3794 out_unregister_key_proto:
3795 proto_unregister(&key_proto);
3796 goto out;
3797 }
3798
3799 module_init(ipsec_pfkey_init);
3800 module_exit(ipsec_pfkey_exit);
3801 MODULE_LICENSE("GPL");
3802 MODULE_ALIAS_NETPROTO(PF_KEY);
kernel source for telekom puls (alcatel/mediatek)