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