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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / key / af_key.c
blob43040e97c474b54dc36cfdc635b2639c28766c74
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 <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_pid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!capable(CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_orphan(*skb2);
207 skb_set_owner_r(*skb2, sk);
208 skb_queue_tail(&sk->sk_receive_queue, *skb2);
209 sk->sk_data_ready(sk, (*skb2)->len);
210 *skb2 = NULL;
211 err = 0;
212 }
213 }
214 sock_put(sk);
215 return err;
216 }
217
218 /* Send SKB to all pfkey sockets matching selected criteria. */
219 #define BROADCAST_ALL 0
220 #define BROADCAST_ONE 1
221 #define BROADCAST_REGISTERED 2
222 #define BROADCAST_PROMISC_ONLY 4
223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
224 int broadcast_flags, struct sock *one_sk,
225 struct net *net)
226 {
227 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
228 struct sock *sk;
229 struct hlist_node *node;
230 struct sk_buff *skb2 = NULL;
231 int err = -ESRCH;
232
233 /* XXX Do we need something like netlink_overrun? I think
234 * XXX PF_KEY socket apps will not mind current behavior.
235 */
236 if (!skb)
237 return -ENOMEM;
238
239 rcu_read_lock();
240 sk_for_each_rcu(sk, node, &net_pfkey->table) {
241 struct pfkey_sock *pfk = pfkey_sk(sk);
242 int err2;
243
244 /* Yes, it means that if you are meant to receive this
245 * pfkey message you receive it twice as promiscuous
246 * socket.
247 */
248 if (pfk->promisc)
249 pfkey_broadcast_one(skb, &skb2, allocation, sk);
250
251 /* the exact target will be processed later */
252 if (sk == one_sk)
253 continue;
254 if (broadcast_flags != BROADCAST_ALL) {
255 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
256 continue;
257 if ((broadcast_flags & BROADCAST_REGISTERED) &&
258 !pfk->registered)
259 continue;
260 if (broadcast_flags & BROADCAST_ONE)
261 continue;
262 }
263
264 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
265
266 /* Error is cleare after succecful sending to at least one
267 * registered KM */
268 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
269 err = err2;
270 }
271 rcu_read_unlock();
272
273 if (one_sk != NULL)
274 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
275
276 kfree_skb(skb2);
277 kfree_skb(skb);
278 return err;
279 }
280
281 static int pfkey_do_dump(struct pfkey_sock *pfk)
282 {
283 struct sadb_msg *hdr;
284 int rc;
285
286 rc = pfk->dump.dump(pfk);
287 if (rc == -ENOBUFS)
288 return 0;
289
290 if (pfk->dump.skb) {
291 if (!pfkey_can_dump(&pfk->sk))
292 return 0;
293
294 hdr = (struct sadb_msg *) pfk->dump.skb->data;
295 hdr->sadb_msg_seq = 0;
296 hdr->sadb_msg_errno = rc;
297 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
298 &pfk->sk, sock_net(&pfk->sk));
299 pfk->dump.skb = NULL;
300 }
301
302 pfkey_terminate_dump(pfk);
303 return rc;
304 }
305
306 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
307 {
308 *new = *orig;
309 }
310
311 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
312 {
313 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
314 struct sadb_msg *hdr;
315
316 if (!skb)
317 return -ENOBUFS;
318
319 /* Woe be to the platform trying to support PFKEY yet
320 * having normal errnos outside the 1-255 range, inclusive.
321 */
322 err = -err;
323 if (err == ERESTARTSYS ||
324 err == ERESTARTNOHAND ||
325 err == ERESTARTNOINTR)
326 err = EINTR;
327 if (err >= 512)
328 err = EINVAL;
329 BUG_ON(err <= 0 || err >= 256);
330
331 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
332 pfkey_hdr_dup(hdr, orig);
333 hdr->sadb_msg_errno = (uint8_t) err;
334 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
335 sizeof(uint64_t));
336
337 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
338
339 return 0;
340 }
341
342 static u8 sadb_ext_min_len[] = {
343 [SADB_EXT_RESERVED] = (u8) 0,
344 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
345 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
348 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
351 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
353 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
355 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
356 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
357 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
359 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
360 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
361 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
362 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
363 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
364 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
366 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
367 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
368 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
369 };
370
371 /* Verify sadb_address_{len,prefixlen} against sa_family. */
372 static int verify_address_len(void *p)
373 {
374 struct sadb_address *sp = p;
375 struct sockaddr *addr = (struct sockaddr *)(sp + 1);
376 struct sockaddr_in *sin;
377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
378 struct sockaddr_in6 *sin6;
379 #endif
380 int len;
381
382 switch (addr->sa_family) {
383 case AF_INET:
384 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
385 if (sp->sadb_address_len != len ||
386 sp->sadb_address_prefixlen > 32)
387 return -EINVAL;
388 break;
389 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
390 case AF_INET6:
391 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
392 if (sp->sadb_address_len != len ||
393 sp->sadb_address_prefixlen > 128)
394 return -EINVAL;
395 break;
396 #endif
397 default:
398 /* It is user using kernel to keep track of security
399 * associations for another protocol, such as
400 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
401 * lengths.
402 *
403 * XXX Actually, association/policy database is not yet
404 * XXX able to cope with arbitrary sockaddr families.
405 * XXX When it can, remove this -EINVAL. -DaveM
406 */
407 return -EINVAL;
408 break;
409 }
410
411 return 0;
412 }
413
414 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
415 {
416 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
417 sec_ctx->sadb_x_ctx_len,
418 sizeof(uint64_t));
419 }
420
421 static inline int verify_sec_ctx_len(void *p)
422 {
423 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
424 int len = sec_ctx->sadb_x_ctx_len;
425
426 if (len > PAGE_SIZE)
427 return -EINVAL;
428
429 len = pfkey_sec_ctx_len(sec_ctx);
430
431 if (sec_ctx->sadb_x_sec_len != len)
432 return -EINVAL;
433
434 return 0;
435 }
436
437 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
438 {
439 struct xfrm_user_sec_ctx *uctx = NULL;
440 int ctx_size = sec_ctx->sadb_x_ctx_len;
441
442 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
443
444 if (!uctx)
445 return NULL;
446
447 uctx->len = pfkey_sec_ctx_len(sec_ctx);
448 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
449 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
450 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
451 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
452 memcpy(uctx + 1, sec_ctx + 1,
453 uctx->ctx_len);
454
455 return uctx;
456 }
457
458 static int present_and_same_family(struct sadb_address *src,
459 struct sadb_address *dst)
460 {
461 struct sockaddr *s_addr, *d_addr;
462
463 if (!src || !dst)
464 return 0;
465
466 s_addr = (struct sockaddr *)(src + 1);
467 d_addr = (struct sockaddr *)(dst + 1);
468 if (s_addr->sa_family != d_addr->sa_family)
469 return 0;
470 if (s_addr->sa_family != AF_INET
471 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
472 && s_addr->sa_family != AF_INET6
473 #endif
474 )
475 return 0;
476
477 return 1;
478 }
479
480 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
481 {
482 char *p = (char *) hdr;
483 int len = skb->len;
484
485 len -= sizeof(*hdr);
486 p += sizeof(*hdr);
487 while (len > 0) {
488 struct sadb_ext *ehdr = (struct sadb_ext *) p;
489 uint16_t ext_type;
490 int ext_len;
491
492 ext_len = ehdr->sadb_ext_len;
493 ext_len *= sizeof(uint64_t);
494 ext_type = ehdr->sadb_ext_type;
495 if (ext_len < sizeof(uint64_t) ||
496 ext_len > len ||
497 ext_type == SADB_EXT_RESERVED)
498 return -EINVAL;
499
500 if (ext_type <= SADB_EXT_MAX) {
501 int min = (int) sadb_ext_min_len[ext_type];
502 if (ext_len < min)
503 return -EINVAL;
504 if (ext_hdrs[ext_type-1] != NULL)
505 return -EINVAL;
506 if (ext_type == SADB_EXT_ADDRESS_SRC ||
507 ext_type == SADB_EXT_ADDRESS_DST ||
508 ext_type == SADB_EXT_ADDRESS_PROXY ||
509 ext_type == SADB_X_EXT_NAT_T_OA) {
510 if (verify_address_len(p))
511 return -EINVAL;
512 }
513 if (ext_type == SADB_X_EXT_SEC_CTX) {
514 if (verify_sec_ctx_len(p))
515 return -EINVAL;
516 }
517 ext_hdrs[ext_type-1] = p;
518 }
519 p += ext_len;
520 len -= ext_len;
521 }
522
523 return 0;
524 }
525
526 static uint16_t
527 pfkey_satype2proto(uint8_t satype)
528 {
529 switch (satype) {
530 case SADB_SATYPE_UNSPEC:
531 return IPSEC_PROTO_ANY;
532 case SADB_SATYPE_AH:
533 return IPPROTO_AH;
534 case SADB_SATYPE_ESP:
535 return IPPROTO_ESP;
536 case SADB_X_SATYPE_IPCOMP:
537 return IPPROTO_COMP;
538 break;
539 default:
540 return 0;
541 }
542 /* NOTREACHED */
543 }
544
545 static uint8_t
546 pfkey_proto2satype(uint16_t proto)
547 {
548 switch (proto) {
549 case IPPROTO_AH:
550 return SADB_SATYPE_AH;
551 case IPPROTO_ESP:
552 return SADB_SATYPE_ESP;
553 case IPPROTO_COMP:
554 return SADB_X_SATYPE_IPCOMP;
555 break;
556 default:
557 return 0;
558 }
559 /* NOTREACHED */
560 }
561
562 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
563 * say specifically 'just raw sockets' as we encode them as 255.
564 */
565
566 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
567 {
568 return (proto == IPSEC_PROTO_ANY ? 0 : proto);
569 }
570
571 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
572 {
573 return (proto ? proto : IPSEC_PROTO_ANY);
574 }
575
576 static inline int pfkey_sockaddr_len(sa_family_t family)
577 {
578 switch (family) {
579 case AF_INET:
580 return sizeof(struct sockaddr_in);
581 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
582 case AF_INET6:
583 return sizeof(struct sockaddr_in6);
584 #endif
585 }
586 return 0;
587 }
588
589 static
590 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
591 {
592 switch (sa->sa_family) {
593 case AF_INET:
594 xaddr->a4 =
595 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
596 return AF_INET;
597 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
598 case AF_INET6:
599 memcpy(xaddr->a6,
600 &((struct sockaddr_in6 *)sa)->sin6_addr,
601 sizeof(struct in6_addr));
602 return AF_INET6;
603 #endif
604 }
605 return 0;
606 }
607
608 static
609 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
610 {
611 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
612 xaddr);
613 }
614
615 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs)
616 {
617 struct sadb_sa *sa;
618 struct sadb_address *addr;
619 uint16_t proto;
620 unsigned short family;
621 xfrm_address_t *xaddr;
622
623 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
624 if (sa == NULL)
625 return NULL;
626
627 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
628 if (proto == 0)
629 return NULL;
630
631 /* sadb_address_len should be checked by caller */
632 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
633 if (addr == NULL)
634 return NULL;
635
636 family = ((struct sockaddr *)(addr + 1))->sa_family;
637 switch (family) {
638 case AF_INET:
639 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
640 break;
641 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
642 case AF_INET6:
643 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
644 break;
645 #endif
646 default:
647 xaddr = NULL;
648 }
649
650 if (!xaddr)
651 return NULL;
652
653 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
654 }
655
656 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
657
658 static int
659 pfkey_sockaddr_size(sa_family_t family)
660 {
661 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
662 }
663
664 static inline int pfkey_mode_from_xfrm(int mode)
665 {
666 switch(mode) {
667 case XFRM_MODE_TRANSPORT:
668 return IPSEC_MODE_TRANSPORT;
669 case XFRM_MODE_TUNNEL:
670 return IPSEC_MODE_TUNNEL;
671 case XFRM_MODE_BEET:
672 return IPSEC_MODE_BEET;
673 default:
674 return -1;
675 }
676 }
677
678 static inline int pfkey_mode_to_xfrm(int mode)
679 {
680 switch(mode) {
681 case IPSEC_MODE_ANY: /*XXX*/
682 case IPSEC_MODE_TRANSPORT:
683 return XFRM_MODE_TRANSPORT;
684 case IPSEC_MODE_TUNNEL:
685 return XFRM_MODE_TUNNEL;
686 case IPSEC_MODE_BEET:
687 return XFRM_MODE_BEET;
688 default:
689 return -1;
690 }
691 }
692
693 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
694 struct sockaddr *sa,
695 unsigned short family)
696 {
697 switch (family) {
698 case AF_INET:
699 {
700 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
701 sin->sin_family = AF_INET;
702 sin->sin_port = port;
703 sin->sin_addr.s_addr = xaddr->a4;
704 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
705 return 32;
706 }
707 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
708 case AF_INET6:
709 {
710 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
711 sin6->sin6_family = AF_INET6;
712 sin6->sin6_port = port;
713 sin6->sin6_flowinfo = 0;
714 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
715 sin6->sin6_scope_id = 0;
716 return 128;
717 }
718 #endif
719 }
720 return 0;
721 }
722
723 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
724 int add_keys, int hsc)
725 {
726 struct sk_buff *skb;
727 struct sadb_msg *hdr;
728 struct sadb_sa *sa;
729 struct sadb_lifetime *lifetime;
730 struct sadb_address *addr;
731 struct sadb_key *key;
732 struct sadb_x_sa2 *sa2;
733 struct sadb_x_sec_ctx *sec_ctx;
734 struct xfrm_sec_ctx *xfrm_ctx;
735 int ctx_size = 0;
736 int size;
737 int auth_key_size = 0;
738 int encrypt_key_size = 0;
739 int sockaddr_size;
740 struct xfrm_encap_tmpl *natt = NULL;
741 int mode;
742
743 /* address family check */
744 sockaddr_size = pfkey_sockaddr_size(x->props.family);
745 if (!sockaddr_size)
746 return ERR_PTR(-EINVAL);
747
748 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
749 key(AE), (identity(SD),) (sensitivity)> */
750 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
751 sizeof(struct sadb_lifetime) +
752 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
753 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
754 sizeof(struct sadb_address)*2 +
755 sockaddr_size*2 +
756 sizeof(struct sadb_x_sa2);
757
758 if ((xfrm_ctx = x->security)) {
759 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
760 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
761 }
762
763 /* identity & sensitivity */
764 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
765 size += sizeof(struct sadb_address) + sockaddr_size;
766
767 if (add_keys) {
768 if (x->aalg && x->aalg->alg_key_len) {
769 auth_key_size =
770 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
771 size += sizeof(struct sadb_key) + auth_key_size;
772 }
773 if (x->ealg && x->ealg->alg_key_len) {
774 encrypt_key_size =
775 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
776 size += sizeof(struct sadb_key) + encrypt_key_size;
777 }
778 }
779 if (x->encap)
780 natt = x->encap;
781
782 if (natt && natt->encap_type) {
783 size += sizeof(struct sadb_x_nat_t_type);
784 size += sizeof(struct sadb_x_nat_t_port);
785 size += sizeof(struct sadb_x_nat_t_port);
786 }
787
788 skb = alloc_skb(size + 16, GFP_ATOMIC);
789 if (skb == NULL)
790 return ERR_PTR(-ENOBUFS);
791
792 /* call should fill header later */
793 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
794 memset(hdr, 0, size); /* XXX do we need this ? */
795 hdr->sadb_msg_len = size / sizeof(uint64_t);
796
797 /* sa */
798 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
799 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
800 sa->sadb_sa_exttype = SADB_EXT_SA;
801 sa->sadb_sa_spi = x->id.spi;
802 sa->sadb_sa_replay = x->props.replay_window;
803 switch (x->km.state) {
804 case XFRM_STATE_VALID:
805 sa->sadb_sa_state = x->km.dying ?
806 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
807 break;
808 case XFRM_STATE_ACQ:
809 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
810 break;
811 default:
812 sa->sadb_sa_state = SADB_SASTATE_DEAD;
813 break;
814 }
815 sa->sadb_sa_auth = 0;
816 if (x->aalg) {
817 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
818 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
819 }
820 sa->sadb_sa_encrypt = 0;
821 BUG_ON(x->ealg && x->calg);
822 if (x->ealg) {
823 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
824 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
825 }
826 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
827 if (x->calg) {
828 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
829 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
830 }
831
832 sa->sadb_sa_flags = 0;
833 if (x->props.flags & XFRM_STATE_NOECN)
834 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
835 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
836 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
837 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
838 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
839
840 /* hard time */
841 if (hsc & 2) {
842 lifetime = (struct sadb_lifetime *) skb_put(skb,
843 sizeof(struct sadb_lifetime));
844 lifetime->sadb_lifetime_len =
845 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
846 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
847 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
848 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
849 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
850 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
851 }
852 /* soft time */
853 if (hsc & 1) {
854 lifetime = (struct sadb_lifetime *) skb_put(skb,
855 sizeof(struct sadb_lifetime));
856 lifetime->sadb_lifetime_len =
857 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
858 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
859 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
860 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
861 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
862 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
863 }
864 /* current time */
865 lifetime = (struct sadb_lifetime *) skb_put(skb,
866 sizeof(struct sadb_lifetime));
867 lifetime->sadb_lifetime_len =
868 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
869 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
870 lifetime->sadb_lifetime_allocations = x->curlft.packets;
871 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
872 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
873 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
874 /* src address */
875 addr = (struct sadb_address*) skb_put(skb,
876 sizeof(struct sadb_address)+sockaddr_size);
877 addr->sadb_address_len =
878 (sizeof(struct sadb_address)+sockaddr_size)/
879 sizeof(uint64_t);
880 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
881 /* "if the ports are non-zero, then the sadb_address_proto field,
882 normally zero, MUST be filled in with the transport
883 protocol's number." - RFC2367 */
884 addr->sadb_address_proto = 0;
885 addr->sadb_address_reserved = 0;
886
887 addr->sadb_address_prefixlen =
888 pfkey_sockaddr_fill(&x->props.saddr, 0,
889 (struct sockaddr *) (addr + 1),
890 x->props.family);
891 if (!addr->sadb_address_prefixlen)
892 BUG();
893
894 /* dst address */
895 addr = (struct sadb_address*) skb_put(skb,
896 sizeof(struct sadb_address)+sockaddr_size);
897 addr->sadb_address_len =
898 (sizeof(struct sadb_address)+sockaddr_size)/
899 sizeof(uint64_t);
900 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
901 addr->sadb_address_proto = 0;
902 addr->sadb_address_reserved = 0;
903
904 addr->sadb_address_prefixlen =
905 pfkey_sockaddr_fill(&x->id.daddr, 0,
906 (struct sockaddr *) (addr + 1),
907 x->props.family);
908 if (!addr->sadb_address_prefixlen)
909 BUG();
910
911 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
912 x->props.family)) {
913 addr = (struct sadb_address*) skb_put(skb,
914 sizeof(struct sadb_address)+sockaddr_size);
915 addr->sadb_address_len =
916 (sizeof(struct sadb_address)+sockaddr_size)/
917 sizeof(uint64_t);
918 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
919 addr->sadb_address_proto =
920 pfkey_proto_from_xfrm(x->sel.proto);
921 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
922 addr->sadb_address_reserved = 0;
923
924 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
925 (struct sockaddr *) (addr + 1),
926 x->props.family);
927 }
928
929 /* auth key */
930 if (add_keys && auth_key_size) {
931 key = (struct sadb_key *) skb_put(skb,
932 sizeof(struct sadb_key)+auth_key_size);
933 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
934 sizeof(uint64_t);
935 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
936 key->sadb_key_bits = x->aalg->alg_key_len;
937 key->sadb_key_reserved = 0;
938 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
939 }
940 /* encrypt key */
941 if (add_keys && encrypt_key_size) {
942 key = (struct sadb_key *) skb_put(skb,
943 sizeof(struct sadb_key)+encrypt_key_size);
944 key->sadb_key_len = (sizeof(struct sadb_key) +
945 encrypt_key_size) / sizeof(uint64_t);
946 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
947 key->sadb_key_bits = x->ealg->alg_key_len;
948 key->sadb_key_reserved = 0;
949 memcpy(key + 1, x->ealg->alg_key,
950 (x->ealg->alg_key_len+7)/8);
951 }
952
953 /* sa */
954 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
955 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
956 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
957 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
958 kfree_skb(skb);
959 return ERR_PTR(-EINVAL);
960 }
961 sa2->sadb_x_sa2_mode = mode;
962 sa2->sadb_x_sa2_reserved1 = 0;
963 sa2->sadb_x_sa2_reserved2 = 0;
964 sa2->sadb_x_sa2_sequence = 0;
965 sa2->sadb_x_sa2_reqid = x->props.reqid;
966
967 if (natt && natt->encap_type) {
968 struct sadb_x_nat_t_type *n_type;
969 struct sadb_x_nat_t_port *n_port;
970
971 /* type */
972 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
973 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
974 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
975 n_type->sadb_x_nat_t_type_type = natt->encap_type;
976 n_type->sadb_x_nat_t_type_reserved[0] = 0;
977 n_type->sadb_x_nat_t_type_reserved[1] = 0;
978 n_type->sadb_x_nat_t_type_reserved[2] = 0;
979
980 /* source port */
981 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
982 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
983 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
984 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
985 n_port->sadb_x_nat_t_port_reserved = 0;
986
987 /* dest port */
988 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
989 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
990 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
991 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
992 n_port->sadb_x_nat_t_port_reserved = 0;
993 }
994
995 /* security context */
996 if (xfrm_ctx) {
997 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
998 sizeof(struct sadb_x_sec_ctx) + ctx_size);
999 sec_ctx->sadb_x_sec_len =
1000 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1001 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1002 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1003 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1004 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1005 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1006 xfrm_ctx->ctx_len);
1007 }
1008
1009 return skb;
1010 }
1011
1012
1013 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1014 {
1015 struct sk_buff *skb;
1016
1017 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1018
1019 return skb;
1020 }
1021
1022 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1023 int hsc)
1024 {
1025 return __pfkey_xfrm_state2msg(x, 0, hsc);
1026 }
1027
1028 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1029 struct sadb_msg *hdr,
1030 void **ext_hdrs)
1031 {
1032 struct xfrm_state *x;
1033 struct sadb_lifetime *lifetime;
1034 struct sadb_sa *sa;
1035 struct sadb_key *key;
1036 struct sadb_x_sec_ctx *sec_ctx;
1037 uint16_t proto;
1038 int err;
1039
1040
1041 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1042 if (!sa ||
1043 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1044 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1045 return ERR_PTR(-EINVAL);
1046 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1047 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1048 return ERR_PTR(-EINVAL);
1049 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1050 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1051 return ERR_PTR(-EINVAL);
1052 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1053 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1054 return ERR_PTR(-EINVAL);
1055
1056 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1057 if (proto == 0)
1058 return ERR_PTR(-EINVAL);
1059
1060 /* default error is no buffer space */
1061 err = -ENOBUFS;
1062
1063 /* RFC2367:
1064
1065 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1066 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1067 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1068 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1069 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1070 not true.
1071
1072 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1073 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1074 */
1075 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1076 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1077 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1078 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1079 return ERR_PTR(-EINVAL);
1080 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1081 if (key != NULL &&
1082 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1083 ((key->sadb_key_bits+7) / 8 == 0 ||
1084 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1085 return ERR_PTR(-EINVAL);
1086 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1087 if (key != NULL &&
1088 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1089 ((key->sadb_key_bits+7) / 8 == 0 ||
1090 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1091 return ERR_PTR(-EINVAL);
1092
1093 x = xfrm_state_alloc(net);
1094 if (x == NULL)
1095 return ERR_PTR(-ENOBUFS);
1096
1097 x->id.proto = proto;
1098 x->id.spi = sa->sadb_sa_spi;
1099 x->props.replay_window = sa->sadb_sa_replay;
1100 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1101 x->props.flags |= XFRM_STATE_NOECN;
1102 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1103 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1104 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1105 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1106
1107 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1108 if (lifetime != NULL) {
1109 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1110 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1111 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1112 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1113 }
1114 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1115 if (lifetime != NULL) {
1116 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1117 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1118 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1119 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1120 }
1121
1122 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1123 if (sec_ctx != NULL) {
1124 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1125
1126 if (!uctx)
1127 goto out;
1128
1129 err = security_xfrm_state_alloc(x, uctx);
1130 kfree(uctx);
1131
1132 if (err)
1133 goto out;
1134 }
1135
1136 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1137 if (sa->sadb_sa_auth) {
1138 int keysize = 0;
1139 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1140 if (!a) {
1141 err = -ENOSYS;
1142 goto out;
1143 }
1144 if (key)
1145 keysize = (key->sadb_key_bits + 7) / 8;
1146 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1147 if (!x->aalg)
1148 goto out;
1149 strcpy(x->aalg->alg_name, a->name);
1150 x->aalg->alg_key_len = 0;
1151 if (key) {
1152 x->aalg->alg_key_len = key->sadb_key_bits;
1153 memcpy(x->aalg->alg_key, key+1, keysize);
1154 }
1155 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1156 x->props.aalgo = sa->sadb_sa_auth;
1157 /* x->algo.flags = sa->sadb_sa_flags; */
1158 }
1159 if (sa->sadb_sa_encrypt) {
1160 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1161 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1162 if (!a) {
1163 err = -ENOSYS;
1164 goto out;
1165 }
1166 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1167 if (!x->calg)
1168 goto out;
1169 strcpy(x->calg->alg_name, a->name);
1170 x->props.calgo = sa->sadb_sa_encrypt;
1171 } else {
1172 int keysize = 0;
1173 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1174 if (!a) {
1175 err = -ENOSYS;
1176 goto out;
1177 }
1178 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1179 if (key)
1180 keysize = (key->sadb_key_bits + 7) / 8;
1181 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1182 if (!x->ealg)
1183 goto out;
1184 strcpy(x->ealg->alg_name, a->name);
1185 x->ealg->alg_key_len = 0;
1186 if (key) {
1187 x->ealg->alg_key_len = key->sadb_key_bits;
1188 memcpy(x->ealg->alg_key, key+1, keysize);
1189 }
1190 x->props.ealgo = sa->sadb_sa_encrypt;
1191 }
1192 }
1193 /* x->algo.flags = sa->sadb_sa_flags; */
1194
1195 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1196 &x->props.saddr);
1197 if (!x->props.family) {
1198 err = -EAFNOSUPPORT;
1199 goto out;
1200 }
1201 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1202 &x->id.daddr);
1203
1204 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1205 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1206 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1207 if (mode < 0) {
1208 err = -EINVAL;
1209 goto out;
1210 }
1211 x->props.mode = mode;
1212 x->props.reqid = sa2->sadb_x_sa2_reqid;
1213 }
1214
1215 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1216 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1217
1218 /* Nobody uses this, but we try. */
1219 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1220 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1221 }
1222
1223 if (!x->sel.family)
1224 x->sel.family = x->props.family;
1225
1226 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1227 struct sadb_x_nat_t_type* n_type;
1228 struct xfrm_encap_tmpl *natt;
1229
1230 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1231 if (!x->encap)
1232 goto out;
1233
1234 natt = x->encap;
1235 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1236 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1237
1238 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1239 struct sadb_x_nat_t_port* n_port =
1240 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1241 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1242 }
1243 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1244 struct sadb_x_nat_t_port* n_port =
1245 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1246 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1247 }
1248 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1249 }
1250
1251 err = xfrm_init_state(x);
1252 if (err)
1253 goto out;
1254
1255 x->km.seq = hdr->sadb_msg_seq;
1256 return x;
1257
1258 out:
1259 x->km.state = XFRM_STATE_DEAD;
1260 xfrm_state_put(x);
1261 return ERR_PTR(err);
1262 }
1263
1264 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1265 {
1266 return -EOPNOTSUPP;
1267 }
1268
1269 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1270 {
1271 struct net *net = sock_net(sk);
1272 struct sk_buff *resp_skb;
1273 struct sadb_x_sa2 *sa2;
1274 struct sadb_address *saddr, *daddr;
1275 struct sadb_msg *out_hdr;
1276 struct sadb_spirange *range;
1277 struct xfrm_state *x = NULL;
1278 int mode;
1279 int err;
1280 u32 min_spi, max_spi;
1281 u32 reqid;
1282 u8 proto;
1283 unsigned short family;
1284 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1285
1286 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1287 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1288 return -EINVAL;
1289
1290 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1291 if (proto == 0)
1292 return -EINVAL;
1293
1294 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1295 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1296 if (mode < 0)
1297 return -EINVAL;
1298 reqid = sa2->sadb_x_sa2_reqid;
1299 } else {
1300 mode = 0;
1301 reqid = 0;
1302 }
1303
1304 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1305 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1306
1307 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1308 switch (family) {
1309 case AF_INET:
1310 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1311 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1312 break;
1313 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1314 case AF_INET6:
1315 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1316 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1317 break;
1318 #endif
1319 }
1320
1321 if (hdr->sadb_msg_seq) {
1322 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1323 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1324 xfrm_state_put(x);
1325 x = NULL;
1326 }
1327 }
1328
1329 if (!x)
1330 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1331
1332 if (x == NULL)
1333 return -ENOENT;
1334
1335 min_spi = 0x100;
1336 max_spi = 0x0fffffff;
1337
1338 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1339 if (range) {
1340 min_spi = range->sadb_spirange_min;
1341 max_spi = range->sadb_spirange_max;
1342 }
1343
1344 err = xfrm_alloc_spi(x, min_spi, max_spi);
1345 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1346
1347 if (IS_ERR(resp_skb)) {
1348 xfrm_state_put(x);
1349 return PTR_ERR(resp_skb);
1350 }
1351
1352 out_hdr = (struct sadb_msg *) resp_skb->data;
1353 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1354 out_hdr->sadb_msg_type = SADB_GETSPI;
1355 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1356 out_hdr->sadb_msg_errno = 0;
1357 out_hdr->sadb_msg_reserved = 0;
1358 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1359 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1360
1361 xfrm_state_put(x);
1362
1363 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1364
1365 return 0;
1366 }
1367
1368 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1369 {
1370 struct net *net = sock_net(sk);
1371 struct xfrm_state *x;
1372
1373 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1374 return -EOPNOTSUPP;
1375
1376 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1377 return 0;
1378
1379 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1380 if (x == NULL)
1381 return 0;
1382
1383 spin_lock_bh(&x->lock);
1384 if (x->km.state == XFRM_STATE_ACQ) {
1385 x->km.state = XFRM_STATE_ERROR;
1386 wake_up(&net->xfrm.km_waitq);
1387 }
1388 spin_unlock_bh(&x->lock);
1389 xfrm_state_put(x);
1390 return 0;
1391 }
1392
1393 static inline int event2poltype(int event)
1394 {
1395 switch (event) {
1396 case XFRM_MSG_DELPOLICY:
1397 return SADB_X_SPDDELETE;
1398 case XFRM_MSG_NEWPOLICY:
1399 return SADB_X_SPDADD;
1400 case XFRM_MSG_UPDPOLICY:
1401 return SADB_X_SPDUPDATE;
1402 case XFRM_MSG_POLEXPIRE:
1403 // return SADB_X_SPDEXPIRE;
1404 default:
1405 pr_err("pfkey: Unknown policy event %d\n", event);
1406 break;
1407 }
1408
1409 return 0;
1410 }
1411
1412 static inline int event2keytype(int event)
1413 {
1414 switch (event) {
1415 case XFRM_MSG_DELSA:
1416 return SADB_DELETE;
1417 case XFRM_MSG_NEWSA:
1418 return SADB_ADD;
1419 case XFRM_MSG_UPDSA:
1420 return SADB_UPDATE;
1421 case XFRM_MSG_EXPIRE:
1422 return SADB_EXPIRE;
1423 default:
1424 pr_err("pfkey: Unknown SA event %d\n", event);
1425 break;
1426 }
1427
1428 return 0;
1429 }
1430
1431 /* ADD/UPD/DEL */
1432 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1433 {
1434 struct sk_buff *skb;
1435 struct sadb_msg *hdr;
1436
1437 skb = pfkey_xfrm_state2msg(x);
1438
1439 if (IS_ERR(skb))
1440 return PTR_ERR(skb);
1441
1442 hdr = (struct sadb_msg *) skb->data;
1443 hdr->sadb_msg_version = PF_KEY_V2;
1444 hdr->sadb_msg_type = event2keytype(c->event);
1445 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1446 hdr->sadb_msg_errno = 0;
1447 hdr->sadb_msg_reserved = 0;
1448 hdr->sadb_msg_seq = c->seq;
1449 hdr->sadb_msg_pid = c->pid;
1450
1451 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1452
1453 return 0;
1454 }
1455
1456 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1457 {
1458 struct net *net = sock_net(sk);
1459 struct xfrm_state *x;
1460 int err;
1461 struct km_event c;
1462
1463 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1464 if (IS_ERR(x))
1465 return PTR_ERR(x);
1466
1467 xfrm_state_hold(x);
1468 if (hdr->sadb_msg_type == SADB_ADD)
1469 err = xfrm_state_add(x);
1470 else
1471 err = xfrm_state_update(x);
1472
1473 xfrm_audit_state_add(x, err ? 0 : 1,
1474 audit_get_loginuid(current),
1475 audit_get_sessionid(current), 0);
1476
1477 if (err < 0) {
1478 x->km.state = XFRM_STATE_DEAD;
1479 __xfrm_state_put(x);
1480 goto out;
1481 }
1482
1483 if (hdr->sadb_msg_type == SADB_ADD)
1484 c.event = XFRM_MSG_NEWSA;
1485 else
1486 c.event = XFRM_MSG_UPDSA;
1487 c.seq = hdr->sadb_msg_seq;
1488 c.pid = hdr->sadb_msg_pid;
1489 km_state_notify(x, &c);
1490 out:
1491 xfrm_state_put(x);
1492 return err;
1493 }
1494
1495 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1496 {
1497 struct net *net = sock_net(sk);
1498 struct xfrm_state *x;
1499 struct km_event c;
1500 int err;
1501
1502 if (!ext_hdrs[SADB_EXT_SA-1] ||
1503 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1504 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1505 return -EINVAL;
1506
1507 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1508 if (x == NULL)
1509 return -ESRCH;
1510
1511 if ((err = security_xfrm_state_delete(x)))
1512 goto out;
1513
1514 if (xfrm_state_kern(x)) {
1515 err = -EPERM;
1516 goto out;
1517 }
1518
1519 err = xfrm_state_delete(x);
1520
1521 if (err < 0)
1522 goto out;
1523
1524 c.seq = hdr->sadb_msg_seq;
1525 c.pid = hdr->sadb_msg_pid;
1526 c.event = XFRM_MSG_DELSA;
1527 km_state_notify(x, &c);
1528 out:
1529 xfrm_audit_state_delete(x, err ? 0 : 1,
1530 audit_get_loginuid(current),
1531 audit_get_sessionid(current), 0);
1532 xfrm_state_put(x);
1533
1534 return err;
1535 }
1536
1537 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1538 {
1539 struct net *net = sock_net(sk);
1540 __u8 proto;
1541 struct sk_buff *out_skb;
1542 struct sadb_msg *out_hdr;
1543 struct xfrm_state *x;
1544
1545 if (!ext_hdrs[SADB_EXT_SA-1] ||
1546 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548 return -EINVAL;
1549
1550 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551 if (x == NULL)
1552 return -ESRCH;
1553
1554 out_skb = pfkey_xfrm_state2msg(x);
1555 proto = x->id.proto;
1556 xfrm_state_put(x);
1557 if (IS_ERR(out_skb))
1558 return PTR_ERR(out_skb);
1559
1560 out_hdr = (struct sadb_msg *) out_skb->data;
1561 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1562 out_hdr->sadb_msg_type = SADB_GET;
1563 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1564 out_hdr->sadb_msg_errno = 0;
1565 out_hdr->sadb_msg_reserved = 0;
1566 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1567 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1568 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1569
1570 return 0;
1571 }
1572
1573 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1574 gfp_t allocation)
1575 {
1576 struct sk_buff *skb;
1577 struct sadb_msg *hdr;
1578 int len, auth_len, enc_len, i;
1579
1580 auth_len = xfrm_count_auth_supported();
1581 if (auth_len) {
1582 auth_len *= sizeof(struct sadb_alg);
1583 auth_len += sizeof(struct sadb_supported);
1584 }
1585
1586 enc_len = xfrm_count_enc_supported();
1587 if (enc_len) {
1588 enc_len *= sizeof(struct sadb_alg);
1589 enc_len += sizeof(struct sadb_supported);
1590 }
1591
1592 len = enc_len + auth_len + sizeof(struct sadb_msg);
1593
1594 skb = alloc_skb(len + 16, allocation);
1595 if (!skb)
1596 goto out_put_algs;
1597
1598 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1599 pfkey_hdr_dup(hdr, orig);
1600 hdr->sadb_msg_errno = 0;
1601 hdr->sadb_msg_len = len / sizeof(uint64_t);
1602
1603 if (auth_len) {
1604 struct sadb_supported *sp;
1605 struct sadb_alg *ap;
1606
1607 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1608 ap = (struct sadb_alg *) (sp + 1);
1609
1610 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1611 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1612
1613 for (i = 0; ; i++) {
1614 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1615 if (!aalg)
1616 break;
1617 if (aalg->available)
1618 *ap++ = aalg->desc;
1619 }
1620 }
1621
1622 if (enc_len) {
1623 struct sadb_supported *sp;
1624 struct sadb_alg *ap;
1625
1626 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1627 ap = (struct sadb_alg *) (sp + 1);
1628
1629 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1630 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1631
1632 for (i = 0; ; i++) {
1633 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1634 if (!ealg)
1635 break;
1636 if (ealg->available)
1637 *ap++ = ealg->desc;
1638 }
1639 }
1640
1641 out_put_algs:
1642 return skb;
1643 }
1644
1645 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1646 {
1647 struct pfkey_sock *pfk = pfkey_sk(sk);
1648 struct sk_buff *supp_skb;
1649
1650 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1651 return -EINVAL;
1652
1653 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1654 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1655 return -EEXIST;
1656 pfk->registered |= (1<<hdr->sadb_msg_satype);
1657 }
1658
1659 xfrm_probe_algs();
1660
1661 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1662 if (!supp_skb) {
1663 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1664 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1665
1666 return -ENOBUFS;
1667 }
1668
1669 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1670
1671 return 0;
1672 }
1673
1674 static int unicast_flush_resp(struct sock *sk, struct sadb_msg *ihdr)
1675 {
1676 struct sk_buff *skb;
1677 struct sadb_msg *hdr;
1678
1679 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1680 if (!skb)
1681 return -ENOBUFS;
1682
1683 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1684 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1685 hdr->sadb_msg_errno = (uint8_t) 0;
1686 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1687
1688 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1689 }
1690
1691 static int key_notify_sa_flush(struct km_event *c)
1692 {
1693 struct sk_buff *skb;
1694 struct sadb_msg *hdr;
1695
1696 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1697 if (!skb)
1698 return -ENOBUFS;
1699 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1700 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1701 hdr->sadb_msg_type = SADB_FLUSH;
1702 hdr->sadb_msg_seq = c->seq;
1703 hdr->sadb_msg_pid = c->pid;
1704 hdr->sadb_msg_version = PF_KEY_V2;
1705 hdr->sadb_msg_errno = (uint8_t) 0;
1706 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1707
1708 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1709
1710 return 0;
1711 }
1712
1713 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1714 {
1715 struct net *net = sock_net(sk);
1716 unsigned proto;
1717 struct km_event c;
1718 struct xfrm_audit audit_info;
1719 int err, err2;
1720
1721 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1722 if (proto == 0)
1723 return -EINVAL;
1724
1725 audit_info.loginuid = audit_get_loginuid(current);
1726 audit_info.sessionid = audit_get_sessionid(current);
1727 audit_info.secid = 0;
1728 err = xfrm_state_flush(net, proto, &audit_info);
1729 err2 = unicast_flush_resp(sk, hdr);
1730 if (err || err2) {
1731 if (err == -ESRCH) /* empty table - go quietly */
1732 err = 0;
1733 return err ? err : err2;
1734 }
1735
1736 c.data.proto = proto;
1737 c.seq = hdr->sadb_msg_seq;
1738 c.pid = hdr->sadb_msg_pid;
1739 c.event = XFRM_MSG_FLUSHSA;
1740 c.net = net;
1741 km_state_notify(NULL, &c);
1742
1743 return 0;
1744 }
1745
1746 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1747 {
1748 struct pfkey_sock *pfk = ptr;
1749 struct sk_buff *out_skb;
1750 struct sadb_msg *out_hdr;
1751
1752 if (!pfkey_can_dump(&pfk->sk))
1753 return -ENOBUFS;
1754
1755 out_skb = pfkey_xfrm_state2msg(x);
1756 if (IS_ERR(out_skb))
1757 return PTR_ERR(out_skb);
1758
1759 out_hdr = (struct sadb_msg *) out_skb->data;
1760 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1761 out_hdr->sadb_msg_type = SADB_DUMP;
1762 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1763 out_hdr->sadb_msg_errno = 0;
1764 out_hdr->sadb_msg_reserved = 0;
1765 out_hdr->sadb_msg_seq = count + 1;
1766 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1767
1768 if (pfk->dump.skb)
1769 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1770 &pfk->sk, sock_net(&pfk->sk));
1771 pfk->dump.skb = out_skb;
1772
1773 return 0;
1774 }
1775
1776 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1777 {
1778 struct net *net = sock_net(&pfk->sk);
1779 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1780 }
1781
1782 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1783 {
1784 xfrm_state_walk_done(&pfk->dump.u.state);
1785 }
1786
1787 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1788 {
1789 u8 proto;
1790 struct pfkey_sock *pfk = pfkey_sk(sk);
1791
1792 if (pfk->dump.dump != NULL)
1793 return -EBUSY;
1794
1795 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1796 if (proto == 0)
1797 return -EINVAL;
1798
1799 pfk->dump.msg_version = hdr->sadb_msg_version;
1800 pfk->dump.msg_pid = hdr->sadb_msg_pid;
1801 pfk->dump.dump = pfkey_dump_sa;
1802 pfk->dump.done = pfkey_dump_sa_done;
1803 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1804
1805 return pfkey_do_dump(pfk);
1806 }
1807
1808 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1809 {
1810 struct pfkey_sock *pfk = pfkey_sk(sk);
1811 int satype = hdr->sadb_msg_satype;
1812
1813 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1814 /* XXX we mangle packet... */
1815 hdr->sadb_msg_errno = 0;
1816 if (satype != 0 && satype != 1)
1817 return -EINVAL;
1818 pfk->promisc = satype;
1819 }
1820 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1821 return 0;
1822 }
1823
1824 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1825 {
1826 int i;
1827 u32 reqid = *(u32*)ptr;
1828
1829 for (i=0; i<xp->xfrm_nr; i++) {
1830 if (xp->xfrm_vec[i].reqid == reqid)
1831 return -EEXIST;
1832 }
1833 return 0;
1834 }
1835
1836 static u32 gen_reqid(struct net *net)
1837 {
1838 struct xfrm_policy_walk walk;
1839 u32 start;
1840 int rc;
1841 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1842
1843 start = reqid;
1844 do {
1845 ++reqid;
1846 if (reqid == 0)
1847 reqid = IPSEC_MANUAL_REQID_MAX+1;
1848 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1849 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1850 xfrm_policy_walk_done(&walk);
1851 if (rc != -EEXIST)
1852 return reqid;
1853 } while (reqid != start);
1854 return 0;
1855 }
1856
1857 static int
1858 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1859 {
1860 struct net *net = xp_net(xp);
1861 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1862 int mode;
1863
1864 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1865 return -ELOOP;
1866
1867 if (rq->sadb_x_ipsecrequest_mode == 0)
1868 return -EINVAL;
1869
1870 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1871 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1872 return -EINVAL;
1873 t->mode = mode;
1874 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1875 t->optional = 1;
1876 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1877 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1878 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1879 t->reqid = 0;
1880 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1881 return -ENOBUFS;
1882 }
1883
1884 /* addresses present only in tunnel mode */
1885 if (t->mode == XFRM_MODE_TUNNEL) {
1886 u8 *sa = (u8 *) (rq + 1);
1887 int family, socklen;
1888
1889 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1890 &t->saddr);
1891 if (!family)
1892 return -EINVAL;
1893
1894 socklen = pfkey_sockaddr_len(family);
1895 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1896 &t->id.daddr) != family)
1897 return -EINVAL;
1898 t->encap_family = family;
1899 } else
1900 t->encap_family = xp->family;
1901
1902 /* No way to set this via kame pfkey */
1903 t->allalgs = 1;
1904 xp->xfrm_nr++;
1905 return 0;
1906 }
1907
1908 static int
1909 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1910 {
1911 int err;
1912 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1913 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1914
1915 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1916 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1917 return err;
1918 len -= rq->sadb_x_ipsecrequest_len;
1919 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1920 }
1921 return 0;
1922 }
1923
1924 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1925 {
1926 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1927
1928 if (xfrm_ctx) {
1929 int len = sizeof(struct sadb_x_sec_ctx);
1930 len += xfrm_ctx->ctx_len;
1931 return PFKEY_ALIGN8(len);
1932 }
1933 return 0;
1934 }
1935
1936 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1937 {
1938 struct xfrm_tmpl *t;
1939 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1940 int socklen = 0;
1941 int i;
1942
1943 for (i=0; i<xp->xfrm_nr; i++) {
1944 t = xp->xfrm_vec + i;
1945 socklen += pfkey_sockaddr_len(t->encap_family);
1946 }
1947
1948 return sizeof(struct sadb_msg) +
1949 (sizeof(struct sadb_lifetime) * 3) +
1950 (sizeof(struct sadb_address) * 2) +
1951 (sockaddr_size * 2) +
1952 sizeof(struct sadb_x_policy) +
1953 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1954 (socklen * 2) +
1955 pfkey_xfrm_policy2sec_ctx_size(xp);
1956 }
1957
1958 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1959 {
1960 struct sk_buff *skb;
1961 int size;
1962
1963 size = pfkey_xfrm_policy2msg_size(xp);
1964
1965 skb = alloc_skb(size + 16, GFP_ATOMIC);
1966 if (skb == NULL)
1967 return ERR_PTR(-ENOBUFS);
1968
1969 return skb;
1970 }
1971
1972 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1973 {
1974 struct sadb_msg *hdr;
1975 struct sadb_address *addr;
1976 struct sadb_lifetime *lifetime;
1977 struct sadb_x_policy *pol;
1978 struct sadb_x_sec_ctx *sec_ctx;
1979 struct xfrm_sec_ctx *xfrm_ctx;
1980 int i;
1981 int size;
1982 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1983 int socklen = pfkey_sockaddr_len(xp->family);
1984
1985 size = pfkey_xfrm_policy2msg_size(xp);
1986
1987 /* call should fill header later */
1988 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1989 memset(hdr, 0, size); /* XXX do we need this ? */
1990
1991 /* src address */
1992 addr = (struct sadb_address*) skb_put(skb,
1993 sizeof(struct sadb_address)+sockaddr_size);
1994 addr->sadb_address_len =
1995 (sizeof(struct sadb_address)+sockaddr_size)/
1996 sizeof(uint64_t);
1997 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1998 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1999 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2000 addr->sadb_address_reserved = 0;
2001 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2002 xp->selector.sport,
2003 (struct sockaddr *) (addr + 1),
2004 xp->family))
2005 BUG();
2006
2007 /* dst address */
2008 addr = (struct sadb_address*) skb_put(skb,
2009 sizeof(struct sadb_address)+sockaddr_size);
2010 addr->sadb_address_len =
2011 (sizeof(struct sadb_address)+sockaddr_size)/
2012 sizeof(uint64_t);
2013 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2014 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2015 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2016 addr->sadb_address_reserved = 0;
2017
2018 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2019 (struct sockaddr *) (addr + 1),
2020 xp->family);
2021
2022 /* hard time */
2023 lifetime = (struct sadb_lifetime *) skb_put(skb,
2024 sizeof(struct sadb_lifetime));
2025 lifetime->sadb_lifetime_len =
2026 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2027 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2028 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2029 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2030 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2031 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2032 /* soft time */
2033 lifetime = (struct sadb_lifetime *) skb_put(skb,
2034 sizeof(struct sadb_lifetime));
2035 lifetime->sadb_lifetime_len =
2036 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2037 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2038 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2039 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2040 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2041 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2042 /* current time */
2043 lifetime = (struct sadb_lifetime *) skb_put(skb,
2044 sizeof(struct sadb_lifetime));
2045 lifetime->sadb_lifetime_len =
2046 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2048 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2049 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2050 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2051 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2052
2053 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2054 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2055 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2056 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2057 if (xp->action == XFRM_POLICY_ALLOW) {
2058 if (xp->xfrm_nr)
2059 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2060 else
2061 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2062 }
2063 pol->sadb_x_policy_dir = dir+1;
2064 pol->sadb_x_policy_id = xp->index;
2065 pol->sadb_x_policy_priority = xp->priority;
2066
2067 for (i=0; i<xp->xfrm_nr; i++) {
2068 struct sadb_x_ipsecrequest *rq;
2069 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2070 int req_size;
2071 int mode;
2072
2073 req_size = sizeof(struct sadb_x_ipsecrequest);
2074 if (t->mode == XFRM_MODE_TUNNEL) {
2075 socklen = pfkey_sockaddr_len(t->encap_family);
2076 req_size += socklen * 2;
2077 } else {
2078 size -= 2*socklen;
2079 }
2080 rq = (void*)skb_put(skb, req_size);
2081 pol->sadb_x_policy_len += req_size/8;
2082 memset(rq, 0, sizeof(*rq));
2083 rq->sadb_x_ipsecrequest_len = req_size;
2084 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2085 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2086 return -EINVAL;
2087 rq->sadb_x_ipsecrequest_mode = mode;
2088 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2089 if (t->reqid)
2090 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2091 if (t->optional)
2092 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2093 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2094
2095 if (t->mode == XFRM_MODE_TUNNEL) {
2096 u8 *sa = (void *)(rq + 1);
2097 pfkey_sockaddr_fill(&t->saddr, 0,
2098 (struct sockaddr *)sa,
2099 t->encap_family);
2100 pfkey_sockaddr_fill(&t->id.daddr, 0,
2101 (struct sockaddr *) (sa + socklen),
2102 t->encap_family);
2103 }
2104 }
2105
2106 /* security context */
2107 if ((xfrm_ctx = xp->security)) {
2108 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2109
2110 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2111 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2112 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2113 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2114 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2115 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2116 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2117 xfrm_ctx->ctx_len);
2118 }
2119
2120 hdr->sadb_msg_len = size / sizeof(uint64_t);
2121 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2122
2123 return 0;
2124 }
2125
2126 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2127 {
2128 struct sk_buff *out_skb;
2129 struct sadb_msg *out_hdr;
2130 int err;
2131
2132 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2133 if (IS_ERR(out_skb))
2134 return PTR_ERR(out_skb);
2135
2136 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2137 if (err < 0)
2138 return err;
2139
2140 out_hdr = (struct sadb_msg *) out_skb->data;
2141 out_hdr->sadb_msg_version = PF_KEY_V2;
2142
2143 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2144 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2145 else
2146 out_hdr->sadb_msg_type = event2poltype(c->event);
2147 out_hdr->sadb_msg_errno = 0;
2148 out_hdr->sadb_msg_seq = c->seq;
2149 out_hdr->sadb_msg_pid = c->pid;
2150 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2151 return 0;
2152
2153 }
2154
2155 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2156 {
2157 struct net *net = sock_net(sk);
2158 int err = 0;
2159 struct sadb_lifetime *lifetime;
2160 struct sadb_address *sa;
2161 struct sadb_x_policy *pol;
2162 struct xfrm_policy *xp;
2163 struct km_event c;
2164 struct sadb_x_sec_ctx *sec_ctx;
2165
2166 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2167 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2168 !ext_hdrs[SADB_X_EXT_POLICY-1])
2169 return -EINVAL;
2170
2171 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2172 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2173 return -EINVAL;
2174 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2175 return -EINVAL;
2176
2177 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2178 if (xp == NULL)
2179 return -ENOBUFS;
2180
2181 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2182 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2183 xp->priority = pol->sadb_x_policy_priority;
2184
2185 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2186 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2187 if (!xp->family) {
2188 err = -EINVAL;
2189 goto out;
2190 }
2191 xp->selector.family = xp->family;
2192 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2193 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2194 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2195 if (xp->selector.sport)
2196 xp->selector.sport_mask = htons(0xffff);
2197
2198 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2199 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2200 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2201
2202 /* Amusing, we set this twice. KAME apps appear to set same value
2203 * in both addresses.
2204 */
2205 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2206
2207 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2208 if (xp->selector.dport)
2209 xp->selector.dport_mask = htons(0xffff);
2210
2211 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2212 if (sec_ctx != NULL) {
2213 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2214
2215 if (!uctx) {
2216 err = -ENOBUFS;
2217 goto out;
2218 }
2219
2220 err = security_xfrm_policy_alloc(&xp->security, uctx);
2221 kfree(uctx);
2222
2223 if (err)
2224 goto out;
2225 }
2226
2227 xp->lft.soft_byte_limit = XFRM_INF;
2228 xp->lft.hard_byte_limit = XFRM_INF;
2229 xp->lft.soft_packet_limit = XFRM_INF;
2230 xp->lft.hard_packet_limit = XFRM_INF;
2231 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2232 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2233 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2234 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2235 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2236 }
2237 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2238 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2239 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2240 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2241 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2242 }
2243 xp->xfrm_nr = 0;
2244 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2245 (err = parse_ipsecrequests(xp, pol)) < 0)
2246 goto out;
2247
2248 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2249 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2250
2251 xfrm_audit_policy_add(xp, err ? 0 : 1,
2252 audit_get_loginuid(current),
2253 audit_get_sessionid(current), 0);
2254
2255 if (err)
2256 goto out;
2257
2258 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2259 c.event = XFRM_MSG_UPDPOLICY;
2260 else
2261 c.event = XFRM_MSG_NEWPOLICY;
2262
2263 c.seq = hdr->sadb_msg_seq;
2264 c.pid = hdr->sadb_msg_pid;
2265
2266 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2267 xfrm_pol_put(xp);
2268 return 0;
2269
2270 out:
2271 xp->walk.dead = 1;
2272 xfrm_policy_destroy(xp);
2273 return err;
2274 }
2275
2276 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2277 {
2278 struct net *net = sock_net(sk);
2279 int err;
2280 struct sadb_address *sa;
2281 struct sadb_x_policy *pol;
2282 struct xfrm_policy *xp;
2283 struct xfrm_selector sel;
2284 struct km_event c;
2285 struct sadb_x_sec_ctx *sec_ctx;
2286 struct xfrm_sec_ctx *pol_ctx = NULL;
2287
2288 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2289 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2290 !ext_hdrs[SADB_X_EXT_POLICY-1])
2291 return -EINVAL;
2292
2293 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2294 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2295 return -EINVAL;
2296
2297 memset(&sel, 0, sizeof(sel));
2298
2299 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2300 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2301 sel.prefixlen_s = sa->sadb_address_prefixlen;
2302 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2303 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2304 if (sel.sport)
2305 sel.sport_mask = htons(0xffff);
2306
2307 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2308 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2309 sel.prefixlen_d = sa->sadb_address_prefixlen;
2310 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2311 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2312 if (sel.dport)
2313 sel.dport_mask = htons(0xffff);
2314
2315 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2316 if (sec_ctx != NULL) {
2317 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2318
2319 if (!uctx)
2320 return -ENOMEM;
2321
2322 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2323 kfree(uctx);
2324 if (err)
2325 return err;
2326 }
2327
2328 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2329 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2330 1, &err);
2331 security_xfrm_policy_free(pol_ctx);
2332 if (xp == NULL)
2333 return -ENOENT;
2334
2335 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2336 audit_get_loginuid(current),
2337 audit_get_sessionid(current), 0);
2338
2339 if (err)
2340 goto out;
2341
2342 c.seq = hdr->sadb_msg_seq;
2343 c.pid = hdr->sadb_msg_pid;
2344 c.data.byid = 0;
2345 c.event = XFRM_MSG_DELPOLICY;
2346 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2347
2348 out:
2349 xfrm_pol_put(xp);
2350 return err;
2351 }
2352
2353 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2354 {
2355 int err;
2356 struct sk_buff *out_skb;
2357 struct sadb_msg *out_hdr;
2358 err = 0;
2359
2360 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2361 if (IS_ERR(out_skb)) {
2362 err = PTR_ERR(out_skb);
2363 goto out;
2364 }
2365 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2366 if (err < 0)
2367 goto out;
2368
2369 out_hdr = (struct sadb_msg *) out_skb->data;
2370 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2371 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2372 out_hdr->sadb_msg_satype = 0;
2373 out_hdr->sadb_msg_errno = 0;
2374 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2375 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2376 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2377 err = 0;
2378
2379 out:
2380 return err;
2381 }
2382
2383 #ifdef CONFIG_NET_KEY_MIGRATE
2384 static int pfkey_sockaddr_pair_size(sa_family_t family)
2385 {
2386 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2387 }
2388
2389 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2390 xfrm_address_t *saddr, xfrm_address_t *daddr,
2391 u16 *family)
2392 {
2393 int af, socklen;
2394
2395 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2396 return -EINVAL;
2397
2398 af = pfkey_sockaddr_extract(sa, saddr);
2399 if (!af)
2400 return -EINVAL;
2401
2402 socklen = pfkey_sockaddr_len(af);
2403 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2404 daddr) != af)
2405 return -EINVAL;
2406
2407 *family = af;
2408 return 0;
2409 }
2410
2411 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2412 struct xfrm_migrate *m)
2413 {
2414 int err;
2415 struct sadb_x_ipsecrequest *rq2;
2416 int mode;
2417
2418 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2419 len < rq1->sadb_x_ipsecrequest_len)
2420 return -EINVAL;
2421
2422 /* old endoints */
2423 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2424 rq1->sadb_x_ipsecrequest_len,
2425 &m->old_saddr, &m->old_daddr,
2426 &m->old_family);
2427 if (err)
2428 return err;
2429
2430 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2431 len -= rq1->sadb_x_ipsecrequest_len;
2432
2433 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2434 len < rq2->sadb_x_ipsecrequest_len)
2435 return -EINVAL;
2436
2437 /* new endpoints */
2438 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2439 rq2->sadb_x_ipsecrequest_len,
2440 &m->new_saddr, &m->new_daddr,
2441 &m->new_family);
2442 if (err)
2443 return err;
2444
2445 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2446 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2447 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2448 return -EINVAL;
2449
2450 m->proto = rq1->sadb_x_ipsecrequest_proto;
2451 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2452 return -EINVAL;
2453 m->mode = mode;
2454 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2455
2456 return ((int)(rq1->sadb_x_ipsecrequest_len +
2457 rq2->sadb_x_ipsecrequest_len));
2458 }
2459
2460 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2461 struct sadb_msg *hdr, void **ext_hdrs)
2462 {
2463 int i, len, ret, err = -EINVAL;
2464 u8 dir;
2465 struct sadb_address *sa;
2466 struct sadb_x_kmaddress *kma;
2467 struct sadb_x_policy *pol;
2468 struct sadb_x_ipsecrequest *rq;
2469 struct xfrm_selector sel;
2470 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2471 struct xfrm_kmaddress k;
2472
2473 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2474 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2475 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2476 err = -EINVAL;
2477 goto out;
2478 }
2479
2480 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2481 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2482
2483 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2484 err = -EINVAL;
2485 goto out;
2486 }
2487
2488 if (kma) {
2489 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2490 k.reserved = kma->sadb_x_kmaddress_reserved;
2491 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2492 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2493 &k.local, &k.remote, &k.family);
2494 if (ret < 0) {
2495 err = ret;
2496 goto out;
2497 }
2498 }
2499
2500 dir = pol->sadb_x_policy_dir - 1;
2501 memset(&sel, 0, sizeof(sel));
2502
2503 /* set source address info of selector */
2504 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2505 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2506 sel.prefixlen_s = sa->sadb_address_prefixlen;
2507 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2508 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2509 if (sel.sport)
2510 sel.sport_mask = htons(0xffff);
2511
2512 /* set destination address info of selector */
2513 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2514 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2515 sel.prefixlen_d = sa->sadb_address_prefixlen;
2516 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2517 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2518 if (sel.dport)
2519 sel.dport_mask = htons(0xffff);
2520
2521 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2522
2523 /* extract ipsecrequests */
2524 i = 0;
2525 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2526
2527 while (len > 0 && i < XFRM_MAX_DEPTH) {
2528 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2529 if (ret < 0) {
2530 err = ret;
2531 goto out;
2532 } else {
2533 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2534 len -= ret;
2535 i++;
2536 }
2537 }
2538
2539 if (!i || len > 0) {
2540 err = -EINVAL;
2541 goto out;
2542 }
2543
2544 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2545 kma ? &k : NULL);
2546
2547 out:
2548 return err;
2549 }
2550 #else
2551 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2552 struct sadb_msg *hdr, void **ext_hdrs)
2553 {
2554 return -ENOPROTOOPT;
2555 }
2556 #endif
2557
2558
2559 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2560 {
2561 struct net *net = sock_net(sk);
2562 unsigned int dir;
2563 int err = 0, delete;
2564 struct sadb_x_policy *pol;
2565 struct xfrm_policy *xp;
2566 struct km_event c;
2567
2568 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2569 return -EINVAL;
2570
2571 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2572 if (dir >= XFRM_POLICY_MAX)
2573 return -EINVAL;
2574
2575 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2576 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2577 dir, pol->sadb_x_policy_id, delete, &err);
2578 if (xp == NULL)
2579 return -ENOENT;
2580
2581 if (delete) {
2582 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2583 audit_get_loginuid(current),
2584 audit_get_sessionid(current), 0);
2585
2586 if (err)
2587 goto out;
2588 c.seq = hdr->sadb_msg_seq;
2589 c.pid = hdr->sadb_msg_pid;
2590 c.data.byid = 1;
2591 c.event = XFRM_MSG_DELPOLICY;
2592 km_policy_notify(xp, dir, &c);
2593 } else {
2594 err = key_pol_get_resp(sk, xp, hdr, dir);
2595 }
2596
2597 out:
2598 xfrm_pol_put(xp);
2599 return err;
2600 }
2601
2602 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2603 {
2604 struct pfkey_sock *pfk = ptr;
2605 struct sk_buff *out_skb;
2606 struct sadb_msg *out_hdr;
2607 int err;
2608
2609 if (!pfkey_can_dump(&pfk->sk))
2610 return -ENOBUFS;
2611
2612 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2613 if (IS_ERR(out_skb))
2614 return PTR_ERR(out_skb);
2615
2616 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2617 if (err < 0)
2618 return err;
2619
2620 out_hdr = (struct sadb_msg *) out_skb->data;
2621 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2622 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2623 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2624 out_hdr->sadb_msg_errno = 0;
2625 out_hdr->sadb_msg_seq = count + 1;
2626 out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2627
2628 if (pfk->dump.skb)
2629 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2630 &pfk->sk, sock_net(&pfk->sk));
2631 pfk->dump.skb = out_skb;
2632
2633 return 0;
2634 }
2635
2636 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2637 {
2638 struct net *net = sock_net(&pfk->sk);
2639 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2640 }
2641
2642 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2643 {
2644 xfrm_policy_walk_done(&pfk->dump.u.policy);
2645 }
2646
2647 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2648 {
2649 struct pfkey_sock *pfk = pfkey_sk(sk);
2650
2651 if (pfk->dump.dump != NULL)
2652 return -EBUSY;
2653
2654 pfk->dump.msg_version = hdr->sadb_msg_version;
2655 pfk->dump.msg_pid = hdr->sadb_msg_pid;
2656 pfk->dump.dump = pfkey_dump_sp;
2657 pfk->dump.done = pfkey_dump_sp_done;
2658 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2659
2660 return pfkey_do_dump(pfk);
2661 }
2662
2663 static int key_notify_policy_flush(struct km_event *c)
2664 {
2665 struct sk_buff *skb_out;
2666 struct sadb_msg *hdr;
2667
2668 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2669 if (!skb_out)
2670 return -ENOBUFS;
2671 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2672 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2673 hdr->sadb_msg_seq = c->seq;
2674 hdr->sadb_msg_pid = c->pid;
2675 hdr->sadb_msg_version = PF_KEY_V2;
2676 hdr->sadb_msg_errno = (uint8_t) 0;
2677 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2678 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2679 return 0;
2680
2681 }
2682
2683 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2684 {
2685 struct net *net = sock_net(sk);
2686 struct km_event c;
2687 struct xfrm_audit audit_info;
2688 int err, err2;
2689
2690 audit_info.loginuid = audit_get_loginuid(current);
2691 audit_info.sessionid = audit_get_sessionid(current);
2692 audit_info.secid = 0;
2693 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2694 err2 = unicast_flush_resp(sk, hdr);
2695 if (err || err2) {
2696 if (err == -ESRCH) /* empty table - old silent behavior */
2697 return 0;
2698 return err;
2699 }
2700
2701 c.data.type = XFRM_POLICY_TYPE_MAIN;
2702 c.event = XFRM_MSG_FLUSHPOLICY;
2703 c.pid = hdr->sadb_msg_pid;
2704 c.seq = hdr->sadb_msg_seq;
2705 c.net = net;
2706 km_policy_notify(NULL, 0, &c);
2707
2708 return 0;
2709 }
2710
2711 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2712 struct sadb_msg *hdr, void **ext_hdrs);
2713 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2714 [SADB_RESERVED] = pfkey_reserved,
2715 [SADB_GETSPI] = pfkey_getspi,
2716 [SADB_UPDATE] = pfkey_add,
2717 [SADB_ADD] = pfkey_add,
2718 [SADB_DELETE] = pfkey_delete,
2719 [SADB_GET] = pfkey_get,
2720 [SADB_ACQUIRE] = pfkey_acquire,
2721 [SADB_REGISTER] = pfkey_register,
2722 [SADB_EXPIRE] = NULL,
2723 [SADB_FLUSH] = pfkey_flush,
2724 [SADB_DUMP] = pfkey_dump,
2725 [SADB_X_PROMISC] = pfkey_promisc,
2726 [SADB_X_PCHANGE] = NULL,
2727 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2728 [SADB_X_SPDADD] = pfkey_spdadd,
2729 [SADB_X_SPDDELETE] = pfkey_spddelete,
2730 [SADB_X_SPDGET] = pfkey_spdget,
2731 [SADB_X_SPDACQUIRE] = NULL,
2732 [SADB_X_SPDDUMP] = pfkey_spddump,
2733 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2734 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2735 [SADB_X_SPDDELETE2] = pfkey_spdget,
2736 [SADB_X_MIGRATE] = pfkey_migrate,
2737 };
2738
2739 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2740 {
2741 void *ext_hdrs[SADB_EXT_MAX];
2742 int err;
2743
2744 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2745 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2746
2747 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2748 err = parse_exthdrs(skb, hdr, ext_hdrs);
2749 if (!err) {
2750 err = -EOPNOTSUPP;
2751 if (pfkey_funcs[hdr->sadb_msg_type])
2752 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2753 }
2754 return err;
2755 }
2756
2757 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2758 {
2759 struct sadb_msg *hdr = NULL;
2760
2761 if (skb->len < sizeof(*hdr)) {
2762 *errp = -EMSGSIZE;
2763 } else {
2764 hdr = (struct sadb_msg *) skb->data;
2765 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2766 hdr->sadb_msg_reserved != 0 ||
2767 (hdr->sadb_msg_type <= SADB_RESERVED ||
2768 hdr->sadb_msg_type > SADB_MAX)) {
2769 hdr = NULL;
2770 *errp = -EINVAL;
2771 } else if (hdr->sadb_msg_len != (skb->len /
2772 sizeof(uint64_t)) ||
2773 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2774 sizeof(uint64_t))) {
2775 hdr = NULL;
2776 *errp = -EMSGSIZE;
2777 } else {
2778 *errp = 0;
2779 }
2780 }
2781 return hdr;
2782 }
2783
2784 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2785 {
2786 unsigned int id = d->desc.sadb_alg_id;
2787
2788 if (id >= sizeof(t->aalgos) * 8)
2789 return 0;
2790
2791 return (t->aalgos >> id) & 1;
2792 }
2793
2794 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2795 {
2796 unsigned int id = d->desc.sadb_alg_id;
2797
2798 if (id >= sizeof(t->ealgos) * 8)
2799 return 0;
2800
2801 return (t->ealgos >> id) & 1;
2802 }
2803
2804 static int count_ah_combs(struct xfrm_tmpl *t)
2805 {
2806 int i, sz = 0;
2807
2808 for (i = 0; ; i++) {
2809 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2810 if (!aalg)
2811 break;
2812 if (aalg_tmpl_set(t, aalg) && aalg->available)
2813 sz += sizeof(struct sadb_comb);
2814 }
2815 return sz + sizeof(struct sadb_prop);
2816 }
2817
2818 static int count_esp_combs(struct xfrm_tmpl *t)
2819 {
2820 int i, k, sz = 0;
2821
2822 for (i = 0; ; i++) {
2823 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2824 if (!ealg)
2825 break;
2826
2827 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2828 continue;
2829
2830 for (k = 1; ; k++) {
2831 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2832 if (!aalg)
2833 break;
2834
2835 if (aalg_tmpl_set(t, aalg) && aalg->available)
2836 sz += sizeof(struct sadb_comb);
2837 }
2838 }
2839 return sz + sizeof(struct sadb_prop);
2840 }
2841
2842 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2843 {
2844 struct sadb_prop *p;
2845 int i;
2846
2847 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2848 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2849 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2850 p->sadb_prop_replay = 32;
2851 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2852
2853 for (i = 0; ; i++) {
2854 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2855 if (!aalg)
2856 break;
2857
2858 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2859 struct sadb_comb *c;
2860 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2861 memset(c, 0, sizeof(*c));
2862 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2863 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2864 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2865 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2866 c->sadb_comb_hard_addtime = 24*60*60;
2867 c->sadb_comb_soft_addtime = 20*60*60;
2868 c->sadb_comb_hard_usetime = 8*60*60;
2869 c->sadb_comb_soft_usetime = 7*60*60;
2870 }
2871 }
2872 }
2873
2874 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2875 {
2876 struct sadb_prop *p;
2877 int i, k;
2878
2879 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2880 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2881 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2882 p->sadb_prop_replay = 32;
2883 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2884
2885 for (i=0; ; i++) {
2886 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2887 if (!ealg)
2888 break;
2889
2890 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2891 continue;
2892
2893 for (k = 1; ; k++) {
2894 struct sadb_comb *c;
2895 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2896 if (!aalg)
2897 break;
2898 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2899 continue;
2900 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2901 memset(c, 0, sizeof(*c));
2902 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2903 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2904 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2905 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2906 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2907 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2908 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2909 c->sadb_comb_hard_addtime = 24*60*60;
2910 c->sadb_comb_soft_addtime = 20*60*60;
2911 c->sadb_comb_hard_usetime = 8*60*60;
2912 c->sadb_comb_soft_usetime = 7*60*60;
2913 }
2914 }
2915 }
2916
2917 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2918 {
2919 return 0;
2920 }
2921
2922 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2923 {
2924 struct sk_buff *out_skb;
2925 struct sadb_msg *out_hdr;
2926 int hard;
2927 int hsc;
2928
2929 hard = c->data.hard;
2930 if (hard)
2931 hsc = 2;
2932 else
2933 hsc = 1;
2934
2935 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2936 if (IS_ERR(out_skb))
2937 return PTR_ERR(out_skb);
2938
2939 out_hdr = (struct sadb_msg *) out_skb->data;
2940 out_hdr->sadb_msg_version = PF_KEY_V2;
2941 out_hdr->sadb_msg_type = SADB_EXPIRE;
2942 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2943 out_hdr->sadb_msg_errno = 0;
2944 out_hdr->sadb_msg_reserved = 0;
2945 out_hdr->sadb_msg_seq = 0;
2946 out_hdr->sadb_msg_pid = 0;
2947
2948 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2949 return 0;
2950 }
2951
2952 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2953 {
2954 struct net *net = x ? xs_net(x) : c->net;
2955 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2956
2957 if (atomic_read(&net_pfkey->socks_nr) == 0)
2958 return 0;
2959
2960 switch (c->event) {
2961 case XFRM_MSG_EXPIRE:
2962 return key_notify_sa_expire(x, c);
2963 case XFRM_MSG_DELSA:
2964 case XFRM_MSG_NEWSA:
2965 case XFRM_MSG_UPDSA:
2966 return key_notify_sa(x, c);
2967 case XFRM_MSG_FLUSHSA:
2968 return key_notify_sa_flush(c);
2969 case XFRM_MSG_NEWAE: /* not yet supported */
2970 break;
2971 default:
2972 pr_err("pfkey: Unknown SA event %d\n", c->event);
2973 break;
2974 }
2975
2976 return 0;
2977 }
2978
2979 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2980 {
2981 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2982 return 0;
2983
2984 switch (c->event) {
2985 case XFRM_MSG_POLEXPIRE:
2986 return key_notify_policy_expire(xp, c);
2987 case XFRM_MSG_DELPOLICY:
2988 case XFRM_MSG_NEWPOLICY:
2989 case XFRM_MSG_UPDPOLICY:
2990 return key_notify_policy(xp, dir, c);
2991 case XFRM_MSG_FLUSHPOLICY:
2992 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2993 break;
2994 return key_notify_policy_flush(c);
2995 default:
2996 pr_err("pfkey: Unknown policy event %d\n", c->event);
2997 break;
2998 }
2999
3000 return 0;
3001 }
3002
3003 static u32 get_acqseq(void)
3004 {
3005 u32 res;
3006 static atomic_t acqseq;
3007
3008 do {
3009 res = atomic_inc_return(&acqseq);
3010 } while (!res);
3011 return res;
3012 }
3013
3014 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3015 {
3016 struct sk_buff *skb;
3017 struct sadb_msg *hdr;
3018 struct sadb_address *addr;
3019 struct sadb_x_policy *pol;
3020 int sockaddr_size;
3021 int size;
3022 struct sadb_x_sec_ctx *sec_ctx;
3023 struct xfrm_sec_ctx *xfrm_ctx;
3024 int ctx_size = 0;
3025
3026 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3027 if (!sockaddr_size)
3028 return -EINVAL;
3029
3030 size = sizeof(struct sadb_msg) +
3031 (sizeof(struct sadb_address) * 2) +
3032 (sockaddr_size * 2) +
3033 sizeof(struct sadb_x_policy);
3034
3035 if (x->id.proto == IPPROTO_AH)
3036 size += count_ah_combs(t);
3037 else if (x->id.proto == IPPROTO_ESP)
3038 size += count_esp_combs(t);
3039
3040 if ((xfrm_ctx = x->security)) {
3041 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3042 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3043 }
3044
3045 skb = alloc_skb(size + 16, GFP_ATOMIC);
3046 if (skb == NULL)
3047 return -ENOMEM;
3048
3049 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3050 hdr->sadb_msg_version = PF_KEY_V2;
3051 hdr->sadb_msg_type = SADB_ACQUIRE;
3052 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3053 hdr->sadb_msg_len = size / sizeof(uint64_t);
3054 hdr->sadb_msg_errno = 0;
3055 hdr->sadb_msg_reserved = 0;
3056 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3057 hdr->sadb_msg_pid = 0;
3058
3059 /* src address */
3060 addr = (struct sadb_address*) skb_put(skb,
3061 sizeof(struct sadb_address)+sockaddr_size);
3062 addr->sadb_address_len =
3063 (sizeof(struct sadb_address)+sockaddr_size)/
3064 sizeof(uint64_t);
3065 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3066 addr->sadb_address_proto = 0;
3067 addr->sadb_address_reserved = 0;
3068 addr->sadb_address_prefixlen =
3069 pfkey_sockaddr_fill(&x->props.saddr, 0,
3070 (struct sockaddr *) (addr + 1),
3071 x->props.family);
3072 if (!addr->sadb_address_prefixlen)
3073 BUG();
3074
3075 /* dst address */
3076 addr = (struct sadb_address*) skb_put(skb,
3077 sizeof(struct sadb_address)+sockaddr_size);
3078 addr->sadb_address_len =
3079 (sizeof(struct sadb_address)+sockaddr_size)/
3080 sizeof(uint64_t);
3081 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3082 addr->sadb_address_proto = 0;
3083 addr->sadb_address_reserved = 0;
3084 addr->sadb_address_prefixlen =
3085 pfkey_sockaddr_fill(&x->id.daddr, 0,
3086 (struct sockaddr *) (addr + 1),
3087 x->props.family);
3088 if (!addr->sadb_address_prefixlen)
3089 BUG();
3090
3091 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3092 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3093 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3094 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3095 pol->sadb_x_policy_dir = dir+1;
3096 pol->sadb_x_policy_id = xp->index;
3097
3098 /* Set sadb_comb's. */
3099 if (x->id.proto == IPPROTO_AH)
3100 dump_ah_combs(skb, t);
3101 else if (x->id.proto == IPPROTO_ESP)
3102 dump_esp_combs(skb, t);
3103
3104 /* security context */
3105 if (xfrm_ctx) {
3106 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3107 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3108 sec_ctx->sadb_x_sec_len =
3109 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3110 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3111 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3112 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3113 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3114 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3115 xfrm_ctx->ctx_len);
3116 }
3117
3118 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3119 }
3120
3121 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3122 u8 *data, int len, int *dir)
3123 {
3124 struct net *net = sock_net(sk);
3125 struct xfrm_policy *xp;
3126 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3127 struct sadb_x_sec_ctx *sec_ctx;
3128
3129 switch (sk->sk_family) {
3130 case AF_INET:
3131 if (opt != IP_IPSEC_POLICY) {
3132 *dir = -EOPNOTSUPP;
3133 return NULL;
3134 }
3135 break;
3136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3137 case AF_INET6:
3138 if (opt != IPV6_IPSEC_POLICY) {
3139 *dir = -EOPNOTSUPP;
3140 return NULL;
3141 }
3142 break;
3143 #endif
3144 default:
3145 *dir = -EINVAL;
3146 return NULL;
3147 }
3148
3149 *dir = -EINVAL;
3150
3151 if (len < sizeof(struct sadb_x_policy) ||
3152 pol->sadb_x_policy_len*8 > len ||
3153 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3154 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3155 return NULL;
3156
3157 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3158 if (xp == NULL) {
3159 *dir = -ENOBUFS;
3160 return NULL;
3161 }
3162
3163 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3164 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3165
3166 xp->lft.soft_byte_limit = XFRM_INF;
3167 xp->lft.hard_byte_limit = XFRM_INF;
3168 xp->lft.soft_packet_limit = XFRM_INF;
3169 xp->lft.hard_packet_limit = XFRM_INF;
3170 xp->family = sk->sk_family;
3171
3172 xp->xfrm_nr = 0;
3173 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3174 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3175 goto out;
3176
3177 /* security context too */
3178 if (len >= (pol->sadb_x_policy_len*8 +
3179 sizeof(struct sadb_x_sec_ctx))) {
3180 char *p = (char *)pol;
3181 struct xfrm_user_sec_ctx *uctx;
3182
3183 p += pol->sadb_x_policy_len*8;
3184 sec_ctx = (struct sadb_x_sec_ctx *)p;
3185 if (len < pol->sadb_x_policy_len*8 +
3186 sec_ctx->sadb_x_sec_len) {
3187 *dir = -EINVAL;
3188 goto out;
3189 }
3190 if ((*dir = verify_sec_ctx_len(p)))
3191 goto out;
3192 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3193 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3194 kfree(uctx);
3195
3196 if (*dir)
3197 goto out;
3198 }
3199
3200 *dir = pol->sadb_x_policy_dir-1;
3201 return xp;
3202
3203 out:
3204 xp->walk.dead = 1;
3205 xfrm_policy_destroy(xp);
3206 return NULL;
3207 }
3208
3209 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3210 {
3211 struct sk_buff *skb;
3212 struct sadb_msg *hdr;
3213 struct sadb_sa *sa;
3214 struct sadb_address *addr;
3215 struct sadb_x_nat_t_port *n_port;
3216 int sockaddr_size;
3217 int size;
3218 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3219 struct xfrm_encap_tmpl *natt = NULL;
3220
3221 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3222 if (!sockaddr_size)
3223 return -EINVAL;
3224
3225 if (!satype)
3226 return -EINVAL;
3227
3228 if (!x->encap)
3229 return -EINVAL;
3230
3231 natt = x->encap;
3232
3233 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3234 *
3235 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3236 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3237 */
3238
3239 size = sizeof(struct sadb_msg) +
3240 sizeof(struct sadb_sa) +
3241 (sizeof(struct sadb_address) * 2) +
3242 (sockaddr_size * 2) +
3243 (sizeof(struct sadb_x_nat_t_port) * 2);
3244
3245 skb = alloc_skb(size + 16, GFP_ATOMIC);
3246 if (skb == NULL)
3247 return -ENOMEM;
3248
3249 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3250 hdr->sadb_msg_version = PF_KEY_V2;
3251 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3252 hdr->sadb_msg_satype = satype;
3253 hdr->sadb_msg_len = size / sizeof(uint64_t);
3254 hdr->sadb_msg_errno = 0;
3255 hdr->sadb_msg_reserved = 0;
3256 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3257 hdr->sadb_msg_pid = 0;
3258
3259 /* SA */
3260 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3261 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3262 sa->sadb_sa_exttype = SADB_EXT_SA;
3263 sa->sadb_sa_spi = x->id.spi;
3264 sa->sadb_sa_replay = 0;
3265 sa->sadb_sa_state = 0;
3266 sa->sadb_sa_auth = 0;
3267 sa->sadb_sa_encrypt = 0;
3268 sa->sadb_sa_flags = 0;
3269
3270 /* ADDRESS_SRC (old addr) */
3271 addr = (struct sadb_address*)
3272 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3273 addr->sadb_address_len =
3274 (sizeof(struct sadb_address)+sockaddr_size)/
3275 sizeof(uint64_t);
3276 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3277 addr->sadb_address_proto = 0;
3278 addr->sadb_address_reserved = 0;
3279 addr->sadb_address_prefixlen =
3280 pfkey_sockaddr_fill(&x->props.saddr, 0,
3281 (struct sockaddr *) (addr + 1),
3282 x->props.family);
3283 if (!addr->sadb_address_prefixlen)
3284 BUG();
3285
3286 /* NAT_T_SPORT (old port) */
3287 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3288 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3289 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3290 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3291 n_port->sadb_x_nat_t_port_reserved = 0;
3292
3293 /* ADDRESS_DST (new addr) */
3294 addr = (struct sadb_address*)
3295 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3296 addr->sadb_address_len =
3297 (sizeof(struct sadb_address)+sockaddr_size)/
3298 sizeof(uint64_t);
3299 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3300 addr->sadb_address_proto = 0;
3301 addr->sadb_address_reserved = 0;
3302 addr->sadb_address_prefixlen =
3303 pfkey_sockaddr_fill(ipaddr, 0,
3304 (struct sockaddr *) (addr + 1),
3305 x->props.family);
3306 if (!addr->sadb_address_prefixlen)
3307 BUG();
3308
3309 /* NAT_T_DPORT (new port) */
3310 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3311 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3312 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3313 n_port->sadb_x_nat_t_port_port = sport;
3314 n_port->sadb_x_nat_t_port_reserved = 0;
3315
3316 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3317 }
3318
3319 #ifdef CONFIG_NET_KEY_MIGRATE
3320 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3321 struct xfrm_selector *sel)
3322 {
3323 struct sadb_address *addr;
3324 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3325 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3326 addr->sadb_address_exttype = type;
3327 addr->sadb_address_proto = sel->proto;
3328 addr->sadb_address_reserved = 0;
3329
3330 switch (type) {
3331 case SADB_EXT_ADDRESS_SRC:
3332 addr->sadb_address_prefixlen = sel->prefixlen_s;
3333 pfkey_sockaddr_fill(&sel->saddr, 0,
3334 (struct sockaddr *)(addr + 1),
3335 sel->family);
3336 break;
3337 case SADB_EXT_ADDRESS_DST:
3338 addr->sadb_address_prefixlen = sel->prefixlen_d;
3339 pfkey_sockaddr_fill(&sel->daddr, 0,
3340 (struct sockaddr *)(addr + 1),
3341 sel->family);
3342 break;
3343 default:
3344 return -EINVAL;
3345 }
3346
3347 return 0;
3348 }
3349
3350
3351 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3352 {
3353 struct sadb_x_kmaddress *kma;
3354 u8 *sa;
3355 int family = k->family;
3356 int socklen = pfkey_sockaddr_len(family);
3357 int size_req;
3358
3359 size_req = (sizeof(struct sadb_x_kmaddress) +
3360 pfkey_sockaddr_pair_size(family));
3361
3362 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3363 memset(kma, 0, size_req);
3364 kma->sadb_x_kmaddress_len = size_req / 8;
3365 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3366 kma->sadb_x_kmaddress_reserved = k->reserved;
3367
3368 sa = (u8 *)(kma + 1);
3369 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3370 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3371 return -EINVAL;
3372
3373 return 0;
3374 }
3375
3376 static int set_ipsecrequest(struct sk_buff *skb,
3377 uint8_t proto, uint8_t mode, int level,
3378 uint32_t reqid, uint8_t family,
3379 xfrm_address_t *src, xfrm_address_t *dst)
3380 {
3381 struct sadb_x_ipsecrequest *rq;
3382 u8 *sa;
3383 int socklen = pfkey_sockaddr_len(family);
3384 int size_req;
3385
3386 size_req = sizeof(struct sadb_x_ipsecrequest) +
3387 pfkey_sockaddr_pair_size(family);
3388
3389 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3390 memset(rq, 0, size_req);
3391 rq->sadb_x_ipsecrequest_len = size_req;
3392 rq->sadb_x_ipsecrequest_proto = proto;
3393 rq->sadb_x_ipsecrequest_mode = mode;
3394 rq->sadb_x_ipsecrequest_level = level;
3395 rq->sadb_x_ipsecrequest_reqid = reqid;
3396
3397 sa = (u8 *) (rq + 1);
3398 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3399 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3400 return -EINVAL;
3401
3402 return 0;
3403 }
3404 #endif
3405
3406 #ifdef CONFIG_NET_KEY_MIGRATE
3407 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3408 struct xfrm_migrate *m, int num_bundles,
3409 struct xfrm_kmaddress *k)
3410 {
3411 int i;
3412 int sasize_sel;
3413 int size = 0;
3414 int size_pol = 0;
3415 struct sk_buff *skb;
3416 struct sadb_msg *hdr;
3417 struct sadb_x_policy *pol;
3418 struct xfrm_migrate *mp;
3419
3420 if (type != XFRM_POLICY_TYPE_MAIN)
3421 return 0;
3422
3423 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3424 return -EINVAL;
3425
3426 if (k != NULL) {
3427 /* addresses for KM */
3428 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3429 pfkey_sockaddr_pair_size(k->family));
3430 }
3431
3432 /* selector */
3433 sasize_sel = pfkey_sockaddr_size(sel->family);
3434 if (!sasize_sel)
3435 return -EINVAL;
3436 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3437
3438 /* policy info */
3439 size_pol += sizeof(struct sadb_x_policy);
3440
3441 /* ipsecrequests */
3442 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3443 /* old locator pair */
3444 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3445 pfkey_sockaddr_pair_size(mp->old_family);
3446 /* new locator pair */
3447 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3448 pfkey_sockaddr_pair_size(mp->new_family);
3449 }
3450
3451 size += sizeof(struct sadb_msg) + size_pol;
3452
3453 /* alloc buffer */
3454 skb = alloc_skb(size, GFP_ATOMIC);
3455 if (skb == NULL)
3456 return -ENOMEM;
3457
3458 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3459 hdr->sadb_msg_version = PF_KEY_V2;
3460 hdr->sadb_msg_type = SADB_X_MIGRATE;
3461 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3462 hdr->sadb_msg_len = size / 8;
3463 hdr->sadb_msg_errno = 0;
3464 hdr->sadb_msg_reserved = 0;
3465 hdr->sadb_msg_seq = 0;
3466 hdr->sadb_msg_pid = 0;
3467
3468 /* Addresses to be used by KM for negotiation, if ext is available */
3469 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3470 return -EINVAL;
3471
3472 /* selector src */
3473 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3474
3475 /* selector dst */
3476 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3477
3478 /* policy information */
3479 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3480 pol->sadb_x_policy_len = size_pol / 8;
3481 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3482 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3483 pol->sadb_x_policy_dir = dir + 1;
3484 pol->sadb_x_policy_id = 0;
3485 pol->sadb_x_policy_priority = 0;
3486
3487 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3488 /* old ipsecrequest */
3489 int mode = pfkey_mode_from_xfrm(mp->mode);
3490 if (mode < 0)
3491 goto err;
3492 if (set_ipsecrequest(skb, mp->proto, mode,
3493 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3494 mp->reqid, mp->old_family,
3495 &mp->old_saddr, &mp->old_daddr) < 0)
3496 goto err;
3497
3498 /* new ipsecrequest */
3499 if (set_ipsecrequest(skb, mp->proto, mode,
3500 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3501 mp->reqid, mp->new_family,
3502 &mp->new_saddr, &mp->new_daddr) < 0)
3503 goto err;
3504 }
3505
3506 /* broadcast migrate message to sockets */
3507 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3508
3509 return 0;
3510
3511 err:
3512 kfree_skb(skb);
3513 return -EINVAL;
3514 }
3515 #else
3516 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3517 struct xfrm_migrate *m, int num_bundles,
3518 struct xfrm_kmaddress *k)
3519 {
3520 return -ENOPROTOOPT;
3521 }
3522 #endif
3523
3524 static int pfkey_sendmsg(struct kiocb *kiocb,
3525 struct socket *sock, struct msghdr *msg, size_t len)
3526 {
3527 struct sock *sk = sock->sk;
3528 struct sk_buff *skb = NULL;
3529 struct sadb_msg *hdr = NULL;
3530 int err;
3531
3532 err = -EOPNOTSUPP;
3533 if (msg->msg_flags & MSG_OOB)
3534 goto out;
3535
3536 err = -EMSGSIZE;
3537 if ((unsigned)len > sk->sk_sndbuf - 32)
3538 goto out;
3539
3540 err = -ENOBUFS;
3541 skb = alloc_skb(len, GFP_KERNEL);
3542 if (skb == NULL)
3543 goto out;
3544
3545 err = -EFAULT;
3546 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3547 goto out;
3548
3549 hdr = pfkey_get_base_msg(skb, &err);
3550 if (!hdr)
3551 goto out;
3552
3553 mutex_lock(&xfrm_cfg_mutex);
3554 err = pfkey_process(sk, skb, hdr);
3555 mutex_unlock(&xfrm_cfg_mutex);
3556
3557 out:
3558 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3559 err = 0;
3560 kfree_skb(skb);
3561
3562 return err ? : len;
3563 }
3564
3565 static int pfkey_recvmsg(struct kiocb *kiocb,
3566 struct socket *sock, struct msghdr *msg, size_t len,
3567 int flags)
3568 {
3569 struct sock *sk = sock->sk;
3570 struct pfkey_sock *pfk = pfkey_sk(sk);
3571 struct sk_buff *skb;
3572 int copied, err;
3573
3574 err = -EINVAL;
3575 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3576 goto out;
3577
3578 msg->msg_namelen = 0;
3579 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3580 if (skb == NULL)
3581 goto out;
3582
3583 copied = skb->len;
3584 if (copied > len) {
3585 msg->msg_flags |= MSG_TRUNC;
3586 copied = len;
3587 }
3588
3589 skb_reset_transport_header(skb);
3590 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3591 if (err)
3592 goto out_free;
3593
3594 sock_recv_ts_and_drops(msg, sk, skb);
3595
3596 err = (flags & MSG_TRUNC) ? skb->len : copied;
3597
3598 if (pfk->dump.dump != NULL &&
3599 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3600 pfkey_do_dump(pfk);
3601
3602 out_free:
3603 skb_free_datagram(sk, skb);
3604 out:
3605 return err;
3606 }
3607
3608 static const struct proto_ops pfkey_ops = {
3609 .family = PF_KEY,
3610 .owner = THIS_MODULE,
3611 /* Operations that make no sense on pfkey sockets. */
3612 .bind = sock_no_bind,
3613 .connect = sock_no_connect,
3614 .socketpair = sock_no_socketpair,
3615 .accept = sock_no_accept,
3616 .getname = sock_no_getname,
3617 .ioctl = sock_no_ioctl,
3618 .listen = sock_no_listen,
3619 .shutdown = sock_no_shutdown,
3620 .setsockopt = sock_no_setsockopt,
3621 .getsockopt = sock_no_getsockopt,
3622 .mmap = sock_no_mmap,
3623 .sendpage = sock_no_sendpage,
3624
3625 /* Now the operations that really occur. */
3626 .release = pfkey_release,
3627 .poll = datagram_poll,
3628 .sendmsg = pfkey_sendmsg,
3629 .recvmsg = pfkey_recvmsg,
3630 };
3631
3632 static const struct net_proto_family pfkey_family_ops = {
3633 .family = PF_KEY,
3634 .create = pfkey_create,
3635 .owner = THIS_MODULE,
3636 };
3637
3638 #ifdef CONFIG_PROC_FS
3639 static int pfkey_seq_show(struct seq_file *f, void *v)
3640 {
3641 struct sock *s = sk_entry(v);
3642
3643 if (v == SEQ_START_TOKEN)
3644 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3645 else
3646 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3647 s,
3648 atomic_read(&s->sk_refcnt),
3649 sk_rmem_alloc_get(s),
3650 sk_wmem_alloc_get(s),
3651 sock_i_uid(s),
3652 sock_i_ino(s)
3653 );
3654 return 0;
3655 }
3656
3657 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3658 {
3659 struct net *net = seq_file_net(f);
3660 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3661
3662 rcu_read_lock();
3663 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3664 }
3665
3666 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3667 {
3668 struct net *net = seq_file_net(f);
3669 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3670
3671 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3672 }
3673
3674 static void pfkey_seq_stop(struct seq_file *f, void *v)
3675 {
3676 rcu_read_unlock();
3677 }
3678
3679 static const struct seq_operations pfkey_seq_ops = {
3680 .start = pfkey_seq_start,
3681 .next = pfkey_seq_next,
3682 .stop = pfkey_seq_stop,
3683 .show = pfkey_seq_show,
3684 };
3685
3686 static int pfkey_seq_open(struct inode *inode, struct file *file)
3687 {
3688 return seq_open_net(inode, file, &pfkey_seq_ops,
3689 sizeof(struct seq_net_private));
3690 }
3691
3692 static const struct file_operations pfkey_proc_ops = {
3693 .open = pfkey_seq_open,
3694 .read = seq_read,
3695 .llseek = seq_lseek,
3696 .release = seq_release_net,
3697 };
3698
3699 static int __net_init pfkey_init_proc(struct net *net)
3700 {
3701 struct proc_dir_entry *e;
3702
3703 e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3704 if (e == NULL)
3705 return -ENOMEM;
3706
3707 return 0;
3708 }
3709
3710 static void __net_exit pfkey_exit_proc(struct net *net)
3711 {
3712 proc_net_remove(net, "pfkey");
3713 }
3714 #else
3715 static inline int pfkey_init_proc(struct net *net)
3716 {
3717 return 0;
3718 }
3719
3720 static inline void pfkey_exit_proc(struct net *net)
3721 {
3722 }
3723 #endif
3724
3725 static struct xfrm_mgr pfkeyv2_mgr =
3726 {
3727 .id = "pfkeyv2",
3728 .notify = pfkey_send_notify,
3729 .acquire = pfkey_send_acquire,
3730 .compile_policy = pfkey_compile_policy,
3731 .new_mapping = pfkey_send_new_mapping,
3732 .notify_policy = pfkey_send_policy_notify,
3733 .migrate = pfkey_send_migrate,
3734 };
3735
3736 static int __net_init pfkey_net_init(struct net *net)
3737 {
3738 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3739 int rv;
3740
3741 INIT_HLIST_HEAD(&net_pfkey->table);
3742 atomic_set(&net_pfkey->socks_nr, 0);
3743
3744 rv = pfkey_init_proc(net);
3745
3746 return rv;
3747 }
3748
3749 static void __net_exit pfkey_net_exit(struct net *net)
3750 {
3751 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3752
3753 pfkey_exit_proc(net);
3754 BUG_ON(!hlist_empty(&net_pfkey->table));
3755 }
3756
3757 static struct pernet_operations pfkey_net_ops = {
3758 .init = pfkey_net_init,
3759 .exit = pfkey_net_exit,
3760 .id = &pfkey_net_id,
3761 .size = sizeof(struct netns_pfkey),
3762 };
3763
3764 static void __exit ipsec_pfkey_exit(void)
3765 {
3766 xfrm_unregister_km(&pfkeyv2_mgr);
3767 sock_unregister(PF_KEY);
3768 unregister_pernet_subsys(&pfkey_net_ops);
3769 proto_unregister(&key_proto);
3770 }
3771
3772 static int __init ipsec_pfkey_init(void)
3773 {
3774 int err = proto_register(&key_proto, 0);
3775
3776 if (err != 0)
3777 goto out;
3778
3779 err = register_pernet_subsys(&pfkey_net_ops);
3780 if (err != 0)
3781 goto out_unregister_key_proto;
3782 err = sock_register(&pfkey_family_ops);
3783 if (err != 0)
3784 goto out_unregister_pernet;
3785 err = xfrm_register_km(&pfkeyv2_mgr);
3786 if (err != 0)
3787 goto out_sock_unregister;
3788 out:
3789 return err;
3790
3791 out_sock_unregister:
3792 sock_unregister(PF_KEY);
3793 out_unregister_pernet:
3794 unregister_pernet_subsys(&pfkey_net_ops);
3795 out_unregister_key_proto:
3796 proto_unregister(&key_proto);
3797 goto out;
3798 }
3799
3800 module_init(ipsec_pfkey_init);
3801 module_exit(ipsec_pfkey_exit);
3802 MODULE_LICENSE("GPL");
3803 MODULE_ALIAS_NETPROTO(PF_KEY);
linux-next