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Linux 3.15-rc1
[linux/fpc-iii.git] / net / key / af_key.c
blobf3c83073afc49f7aad98262cc5776b3edddc7f87
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk);
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 sk_buff *skb2 = NULL;
229 int err = -ESRCH;
230
231 /* XXX Do we need something like netlink_overrun? I think
232 * XXX PF_KEY socket apps will not mind current behavior.
233 */
234 if (!skb)
235 return -ENOMEM;
236
237 rcu_read_lock();
238 sk_for_each_rcu(sk, &net_pfkey->table) {
239 struct pfkey_sock *pfk = pfkey_sk(sk);
240 int err2;
241
242 /* Yes, it means that if you are meant to receive this
243 * pfkey message you receive it twice as promiscuous
244 * socket.
245 */
246 if (pfk->promisc)
247 pfkey_broadcast_one(skb, &skb2, allocation, sk);
248
249 /* the exact target will be processed later */
250 if (sk == one_sk)
251 continue;
252 if (broadcast_flags != BROADCAST_ALL) {
253 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 continue;
255 if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 !pfk->registered)
257 continue;
258 if (broadcast_flags & BROADCAST_ONE)
259 continue;
260 }
261
262 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263
264 /* Error is cleare after succecful sending to at least one
265 * registered KM */
266 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 err = err2;
268 }
269 rcu_read_unlock();
270
271 if (one_sk != NULL)
272 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273
274 kfree_skb(skb2);
275 kfree_skb(skb);
276 return err;
277 }
278
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281 struct sadb_msg *hdr;
282 int rc;
283
284 rc = pfk->dump.dump(pfk);
285 if (rc == -ENOBUFS)
286 return 0;
287
288 if (pfk->dump.skb) {
289 if (!pfkey_can_dump(&pfk->sk))
290 return 0;
291
292 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293 hdr->sadb_msg_seq = 0;
294 hdr->sadb_msg_errno = rc;
295 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296 &pfk->sk, sock_net(&pfk->sk));
297 pfk->dump.skb = NULL;
298 }
299
300 pfkey_terminate_dump(pfk);
301 return rc;
302 }
303
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305 const struct sadb_msg *orig)
306 {
307 *new = *orig;
308 }
309
310 static int pfkey_error(const 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 const 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 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
369 };
370
371 /* Verify sadb_address_{len,prefixlen} against sa_family. */
372 static int verify_address_len(const void *p)
373 {
374 const struct sadb_address *sp = p;
375 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
376 const struct sockaddr_in *sin;
377 #if IS_ENABLED(CONFIG_IPV6)
378 const struct sockaddr_in6 *sin6;
379 #endif
380 int len;
381
382 switch (addr->sa_family) {
383 case AF_INET:
384 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
385 if (sp->sadb_address_len != len ||
386 sp->sadb_address_prefixlen > 32)
387 return -EINVAL;
388 break;
389 #if IS_ENABLED(CONFIG_IPV6)
390 case AF_INET6:
391 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
392 if (sp->sadb_address_len != len ||
393 sp->sadb_address_prefixlen > 128)
394 return -EINVAL;
395 break;
396 #endif
397 default:
398 /* It is user using kernel to keep track of security
399 * associations for another protocol, such as
400 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
401 * lengths.
402 *
403 * XXX Actually, association/policy database is not yet
404 * XXX able to cope with arbitrary sockaddr families.
405 * XXX When it can, remove this -EINVAL. -DaveM
406 */
407 return -EINVAL;
408 break;
409 }
410
411 return 0;
412 }
413
414 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
415 {
416 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
417 sec_ctx->sadb_x_ctx_len,
418 sizeof(uint64_t));
419 }
420
421 static inline int verify_sec_ctx_len(const void *p)
422 {
423 const struct sadb_x_sec_ctx *sec_ctx = p;
424 int len = sec_ctx->sadb_x_ctx_len;
425
426 if (len > PAGE_SIZE)
427 return -EINVAL;
428
429 len = pfkey_sec_ctx_len(sec_ctx);
430
431 if (sec_ctx->sadb_x_sec_len != len)
432 return -EINVAL;
433
434 return 0;
435 }
436
437 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
438 gfp_t gfp)
439 {
440 struct xfrm_user_sec_ctx *uctx = NULL;
441 int ctx_size = sec_ctx->sadb_x_ctx_len;
442
443 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
444
445 if (!uctx)
446 return NULL;
447
448 uctx->len = pfkey_sec_ctx_len(sec_ctx);
449 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
450 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
451 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
452 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
453 memcpy(uctx + 1, sec_ctx + 1,
454 uctx->ctx_len);
455
456 return uctx;
457 }
458
459 static int present_and_same_family(const struct sadb_address *src,
460 const struct sadb_address *dst)
461 {
462 const struct sockaddr *s_addr, *d_addr;
463
464 if (!src || !dst)
465 return 0;
466
467 s_addr = (const struct sockaddr *)(src + 1);
468 d_addr = (const struct sockaddr *)(dst + 1);
469 if (s_addr->sa_family != d_addr->sa_family)
470 return 0;
471 if (s_addr->sa_family != AF_INET
472 #if IS_ENABLED(CONFIG_IPV6)
473 && s_addr->sa_family != AF_INET6
474 #endif
475 )
476 return 0;
477
478 return 1;
479 }
480
481 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
482 {
483 const char *p = (char *) hdr;
484 int len = skb->len;
485
486 len -= sizeof(*hdr);
487 p += sizeof(*hdr);
488 while (len > 0) {
489 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
490 uint16_t ext_type;
491 int ext_len;
492
493 ext_len = ehdr->sadb_ext_len;
494 ext_len *= sizeof(uint64_t);
495 ext_type = ehdr->sadb_ext_type;
496 if (ext_len < sizeof(uint64_t) ||
497 ext_len > len ||
498 ext_type == SADB_EXT_RESERVED)
499 return -EINVAL;
500
501 if (ext_type <= SADB_EXT_MAX) {
502 int min = (int) sadb_ext_min_len[ext_type];
503 if (ext_len < min)
504 return -EINVAL;
505 if (ext_hdrs[ext_type-1] != NULL)
506 return -EINVAL;
507 if (ext_type == SADB_EXT_ADDRESS_SRC ||
508 ext_type == SADB_EXT_ADDRESS_DST ||
509 ext_type == SADB_EXT_ADDRESS_PROXY ||
510 ext_type == SADB_X_EXT_NAT_T_OA) {
511 if (verify_address_len(p))
512 return -EINVAL;
513 }
514 if (ext_type == SADB_X_EXT_SEC_CTX) {
515 if (verify_sec_ctx_len(p))
516 return -EINVAL;
517 }
518 ext_hdrs[ext_type-1] = (void *) p;
519 }
520 p += ext_len;
521 len -= ext_len;
522 }
523
524 return 0;
525 }
526
527 static uint16_t
528 pfkey_satype2proto(uint8_t satype)
529 {
530 switch (satype) {
531 case SADB_SATYPE_UNSPEC:
532 return IPSEC_PROTO_ANY;
533 case SADB_SATYPE_AH:
534 return IPPROTO_AH;
535 case SADB_SATYPE_ESP:
536 return IPPROTO_ESP;
537 case SADB_X_SATYPE_IPCOMP:
538 return IPPROTO_COMP;
539 break;
540 default:
541 return 0;
542 }
543 /* NOTREACHED */
544 }
545
546 static uint8_t
547 pfkey_proto2satype(uint16_t proto)
548 {
549 switch (proto) {
550 case IPPROTO_AH:
551 return SADB_SATYPE_AH;
552 case IPPROTO_ESP:
553 return SADB_SATYPE_ESP;
554 case IPPROTO_COMP:
555 return SADB_X_SATYPE_IPCOMP;
556 break;
557 default:
558 return 0;
559 }
560 /* NOTREACHED */
561 }
562
563 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
564 * say specifically 'just raw sockets' as we encode them as 255.
565 */
566
567 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
568 {
569 return proto == IPSEC_PROTO_ANY ? 0 : proto;
570 }
571
572 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
573 {
574 return proto ? proto : IPSEC_PROTO_ANY;
575 }
576
577 static inline int pfkey_sockaddr_len(sa_family_t family)
578 {
579 switch (family) {
580 case AF_INET:
581 return sizeof(struct sockaddr_in);
582 #if IS_ENABLED(CONFIG_IPV6)
583 case AF_INET6:
584 return sizeof(struct sockaddr_in6);
585 #endif
586 }
587 return 0;
588 }
589
590 static
591 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
592 {
593 switch (sa->sa_family) {
594 case AF_INET:
595 xaddr->a4 =
596 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
597 return AF_INET;
598 #if IS_ENABLED(CONFIG_IPV6)
599 case AF_INET6:
600 memcpy(xaddr->a6,
601 &((struct sockaddr_in6 *)sa)->sin6_addr,
602 sizeof(struct in6_addr));
603 return AF_INET6;
604 #endif
605 }
606 return 0;
607 }
608
609 static
610 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
611 {
612 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
613 xaddr);
614 }
615
616 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
617 {
618 const struct sadb_sa *sa;
619 const struct sadb_address *addr;
620 uint16_t proto;
621 unsigned short family;
622 xfrm_address_t *xaddr;
623
624 sa = ext_hdrs[SADB_EXT_SA - 1];
625 if (sa == NULL)
626 return NULL;
627
628 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
629 if (proto == 0)
630 return NULL;
631
632 /* sadb_address_len should be checked by caller */
633 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
634 if (addr == NULL)
635 return NULL;
636
637 family = ((const struct sockaddr *)(addr + 1))->sa_family;
638 switch (family) {
639 case AF_INET:
640 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
641 break;
642 #if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
645 break;
646 #endif
647 default:
648 xaddr = NULL;
649 }
650
651 if (!xaddr)
652 return NULL;
653
654 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
655 }
656
657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
658
659 static int
660 pfkey_sockaddr_size(sa_family_t family)
661 {
662 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
663 }
664
665 static inline int pfkey_mode_from_xfrm(int mode)
666 {
667 switch(mode) {
668 case XFRM_MODE_TRANSPORT:
669 return IPSEC_MODE_TRANSPORT;
670 case XFRM_MODE_TUNNEL:
671 return IPSEC_MODE_TUNNEL;
672 case XFRM_MODE_BEET:
673 return IPSEC_MODE_BEET;
674 default:
675 return -1;
676 }
677 }
678
679 static inline int pfkey_mode_to_xfrm(int mode)
680 {
681 switch(mode) {
682 case IPSEC_MODE_ANY: /*XXX*/
683 case IPSEC_MODE_TRANSPORT:
684 return XFRM_MODE_TRANSPORT;
685 case IPSEC_MODE_TUNNEL:
686 return XFRM_MODE_TUNNEL;
687 case IPSEC_MODE_BEET:
688 return XFRM_MODE_BEET;
689 default:
690 return -1;
691 }
692 }
693
694 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
695 struct sockaddr *sa,
696 unsigned short family)
697 {
698 switch (family) {
699 case AF_INET:
700 {
701 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
702 sin->sin_family = AF_INET;
703 sin->sin_port = port;
704 sin->sin_addr.s_addr = xaddr->a4;
705 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
706 return 32;
707 }
708 #if IS_ENABLED(CONFIG_IPV6)
709 case AF_INET6:
710 {
711 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
712 sin6->sin6_family = AF_INET6;
713 sin6->sin6_port = port;
714 sin6->sin6_flowinfo = 0;
715 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
716 sin6->sin6_scope_id = 0;
717 return 128;
718 }
719 #endif
720 }
721 return 0;
722 }
723
724 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
725 int add_keys, int hsc)
726 {
727 struct sk_buff *skb;
728 struct sadb_msg *hdr;
729 struct sadb_sa *sa;
730 struct sadb_lifetime *lifetime;
731 struct sadb_address *addr;
732 struct sadb_key *key;
733 struct sadb_x_sa2 *sa2;
734 struct sadb_x_sec_ctx *sec_ctx;
735 struct xfrm_sec_ctx *xfrm_ctx;
736 int ctx_size = 0;
737 int size;
738 int auth_key_size = 0;
739 int encrypt_key_size = 0;
740 int sockaddr_size;
741 struct xfrm_encap_tmpl *natt = NULL;
742 int mode;
743
744 /* address family check */
745 sockaddr_size = pfkey_sockaddr_size(x->props.family);
746 if (!sockaddr_size)
747 return ERR_PTR(-EINVAL);
748
749 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
750 key(AE), (identity(SD),) (sensitivity)> */
751 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
752 sizeof(struct sadb_lifetime) +
753 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
754 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
755 sizeof(struct sadb_address)*2 +
756 sockaddr_size*2 +
757 sizeof(struct sadb_x_sa2);
758
759 if ((xfrm_ctx = x->security)) {
760 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
761 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
762 }
763
764 /* identity & sensitivity */
765 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
766 size += sizeof(struct sadb_address) + sockaddr_size;
767
768 if (add_keys) {
769 if (x->aalg && x->aalg->alg_key_len) {
770 auth_key_size =
771 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
772 size += sizeof(struct sadb_key) + auth_key_size;
773 }
774 if (x->ealg && x->ealg->alg_key_len) {
775 encrypt_key_size =
776 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
777 size += sizeof(struct sadb_key) + encrypt_key_size;
778 }
779 }
780 if (x->encap)
781 natt = x->encap;
782
783 if (natt && natt->encap_type) {
784 size += sizeof(struct sadb_x_nat_t_type);
785 size += sizeof(struct sadb_x_nat_t_port);
786 size += sizeof(struct sadb_x_nat_t_port);
787 }
788
789 skb = alloc_skb(size + 16, GFP_ATOMIC);
790 if (skb == NULL)
791 return ERR_PTR(-ENOBUFS);
792
793 /* call should fill header later */
794 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
795 memset(hdr, 0, size); /* XXX do we need this ? */
796 hdr->sadb_msg_len = size / sizeof(uint64_t);
797
798 /* sa */
799 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
800 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
801 sa->sadb_sa_exttype = SADB_EXT_SA;
802 sa->sadb_sa_spi = x->id.spi;
803 sa->sadb_sa_replay = x->props.replay_window;
804 switch (x->km.state) {
805 case XFRM_STATE_VALID:
806 sa->sadb_sa_state = x->km.dying ?
807 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
808 break;
809 case XFRM_STATE_ACQ:
810 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
811 break;
812 default:
813 sa->sadb_sa_state = SADB_SASTATE_DEAD;
814 break;
815 }
816 sa->sadb_sa_auth = 0;
817 if (x->aalg) {
818 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
819 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
820 a->desc.sadb_alg_id : 0;
821 }
822 sa->sadb_sa_encrypt = 0;
823 BUG_ON(x->ealg && x->calg);
824 if (x->ealg) {
825 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
826 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
827 a->desc.sadb_alg_id : 0;
828 }
829 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
830 if (x->calg) {
831 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
832 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
833 a->desc.sadb_alg_id : 0;
834 }
835
836 sa->sadb_sa_flags = 0;
837 if (x->props.flags & XFRM_STATE_NOECN)
838 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
839 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
840 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
841 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
842 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
843
844 /* hard time */
845 if (hsc & 2) {
846 lifetime = (struct sadb_lifetime *) skb_put(skb,
847 sizeof(struct sadb_lifetime));
848 lifetime->sadb_lifetime_len =
849 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
850 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
851 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
852 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
853 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
854 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
855 }
856 /* soft time */
857 if (hsc & 1) {
858 lifetime = (struct sadb_lifetime *) skb_put(skb,
859 sizeof(struct sadb_lifetime));
860 lifetime->sadb_lifetime_len =
861 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
862 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
863 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
864 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
865 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
866 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
867 }
868 /* current time */
869 lifetime = (struct sadb_lifetime *) skb_put(skb,
870 sizeof(struct sadb_lifetime));
871 lifetime->sadb_lifetime_len =
872 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
873 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
874 lifetime->sadb_lifetime_allocations = x->curlft.packets;
875 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
876 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
877 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
878 /* src address */
879 addr = (struct sadb_address*) skb_put(skb,
880 sizeof(struct sadb_address)+sockaddr_size);
881 addr->sadb_address_len =
882 (sizeof(struct sadb_address)+sockaddr_size)/
883 sizeof(uint64_t);
884 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
885 /* "if the ports are non-zero, then the sadb_address_proto field,
886 normally zero, MUST be filled in with the transport
887 protocol's number." - RFC2367 */
888 addr->sadb_address_proto = 0;
889 addr->sadb_address_reserved = 0;
890
891 addr->sadb_address_prefixlen =
892 pfkey_sockaddr_fill(&x->props.saddr, 0,
893 (struct sockaddr *) (addr + 1),
894 x->props.family);
895 if (!addr->sadb_address_prefixlen)
896 BUG();
897
898 /* dst address */
899 addr = (struct sadb_address*) skb_put(skb,
900 sizeof(struct sadb_address)+sockaddr_size);
901 addr->sadb_address_len =
902 (sizeof(struct sadb_address)+sockaddr_size)/
903 sizeof(uint64_t);
904 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
905 addr->sadb_address_proto = 0;
906 addr->sadb_address_reserved = 0;
907
908 addr->sadb_address_prefixlen =
909 pfkey_sockaddr_fill(&x->id.daddr, 0,
910 (struct sockaddr *) (addr + 1),
911 x->props.family);
912 if (!addr->sadb_address_prefixlen)
913 BUG();
914
915 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
916 x->props.family)) {
917 addr = (struct sadb_address*) skb_put(skb,
918 sizeof(struct sadb_address)+sockaddr_size);
919 addr->sadb_address_len =
920 (sizeof(struct sadb_address)+sockaddr_size)/
921 sizeof(uint64_t);
922 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
923 addr->sadb_address_proto =
924 pfkey_proto_from_xfrm(x->sel.proto);
925 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
926 addr->sadb_address_reserved = 0;
927
928 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
929 (struct sockaddr *) (addr + 1),
930 x->props.family);
931 }
932
933 /* auth key */
934 if (add_keys && auth_key_size) {
935 key = (struct sadb_key *) skb_put(skb,
936 sizeof(struct sadb_key)+auth_key_size);
937 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
938 sizeof(uint64_t);
939 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
940 key->sadb_key_bits = x->aalg->alg_key_len;
941 key->sadb_key_reserved = 0;
942 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
943 }
944 /* encrypt key */
945 if (add_keys && encrypt_key_size) {
946 key = (struct sadb_key *) skb_put(skb,
947 sizeof(struct sadb_key)+encrypt_key_size);
948 key->sadb_key_len = (sizeof(struct sadb_key) +
949 encrypt_key_size) / sizeof(uint64_t);
950 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
951 key->sadb_key_bits = x->ealg->alg_key_len;
952 key->sadb_key_reserved = 0;
953 memcpy(key + 1, x->ealg->alg_key,
954 (x->ealg->alg_key_len+7)/8);
955 }
956
957 /* sa */
958 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
959 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
960 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
961 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
962 kfree_skb(skb);
963 return ERR_PTR(-EINVAL);
964 }
965 sa2->sadb_x_sa2_mode = mode;
966 sa2->sadb_x_sa2_reserved1 = 0;
967 sa2->sadb_x_sa2_reserved2 = 0;
968 sa2->sadb_x_sa2_sequence = 0;
969 sa2->sadb_x_sa2_reqid = x->props.reqid;
970
971 if (natt && natt->encap_type) {
972 struct sadb_x_nat_t_type *n_type;
973 struct sadb_x_nat_t_port *n_port;
974
975 /* type */
976 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
977 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
978 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
979 n_type->sadb_x_nat_t_type_type = natt->encap_type;
980 n_type->sadb_x_nat_t_type_reserved[0] = 0;
981 n_type->sadb_x_nat_t_type_reserved[1] = 0;
982 n_type->sadb_x_nat_t_type_reserved[2] = 0;
983
984 /* source port */
985 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
986 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
987 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
988 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
989 n_port->sadb_x_nat_t_port_reserved = 0;
990
991 /* dest port */
992 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
993 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
994 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
995 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
996 n_port->sadb_x_nat_t_port_reserved = 0;
997 }
998
999 /* security context */
1000 if (xfrm_ctx) {
1001 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1002 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1003 sec_ctx->sadb_x_sec_len =
1004 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1005 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1006 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1007 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1008 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1009 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1010 xfrm_ctx->ctx_len);
1011 }
1012
1013 return skb;
1014 }
1015
1016
1017 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1018 {
1019 struct sk_buff *skb;
1020
1021 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1022
1023 return skb;
1024 }
1025
1026 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1027 int hsc)
1028 {
1029 return __pfkey_xfrm_state2msg(x, 0, hsc);
1030 }
1031
1032 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1033 const struct sadb_msg *hdr,
1034 void * const *ext_hdrs)
1035 {
1036 struct xfrm_state *x;
1037 const struct sadb_lifetime *lifetime;
1038 const struct sadb_sa *sa;
1039 const struct sadb_key *key;
1040 const struct sadb_x_sec_ctx *sec_ctx;
1041 uint16_t proto;
1042 int err;
1043
1044
1045 sa = ext_hdrs[SADB_EXT_SA - 1];
1046 if (!sa ||
1047 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1048 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1049 return ERR_PTR(-EINVAL);
1050 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1051 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1052 return ERR_PTR(-EINVAL);
1053 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1054 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1055 return ERR_PTR(-EINVAL);
1056 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1057 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1058 return ERR_PTR(-EINVAL);
1059
1060 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1061 if (proto == 0)
1062 return ERR_PTR(-EINVAL);
1063
1064 /* default error is no buffer space */
1065 err = -ENOBUFS;
1066
1067 /* RFC2367:
1068
1069 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1070 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1071 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1072 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1073 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1074 not true.
1075
1076 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1077 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1078 */
1079 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1080 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1081 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1082 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1083 return ERR_PTR(-EINVAL);
1084 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1085 if (key != NULL &&
1086 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1087 ((key->sadb_key_bits+7) / 8 == 0 ||
1088 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1089 return ERR_PTR(-EINVAL);
1090 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1091 if (key != NULL &&
1092 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1093 ((key->sadb_key_bits+7) / 8 == 0 ||
1094 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1095 return ERR_PTR(-EINVAL);
1096
1097 x = xfrm_state_alloc(net);
1098 if (x == NULL)
1099 return ERR_PTR(-ENOBUFS);
1100
1101 x->id.proto = proto;
1102 x->id.spi = sa->sadb_sa_spi;
1103 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1104 (sizeof(x->replay.bitmap) * 8));
1105 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1106 x->props.flags |= XFRM_STATE_NOECN;
1107 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1108 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1109 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1110 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1111
1112 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1113 if (lifetime != NULL) {
1114 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1115 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1116 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1117 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1118 }
1119 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1120 if (lifetime != NULL) {
1121 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1122 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1123 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1124 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1125 }
1126
1127 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1128 if (sec_ctx != NULL) {
1129 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1130
1131 if (!uctx)
1132 goto out;
1133
1134 err = security_xfrm_state_alloc(x, uctx);
1135 kfree(uctx);
1136
1137 if (err)
1138 goto out;
1139 }
1140
1141 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1142 if (sa->sadb_sa_auth) {
1143 int keysize = 0;
1144 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1145 if (!a || !a->pfkey_supported) {
1146 err = -ENOSYS;
1147 goto out;
1148 }
1149 if (key)
1150 keysize = (key->sadb_key_bits + 7) / 8;
1151 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1152 if (!x->aalg)
1153 goto out;
1154 strcpy(x->aalg->alg_name, a->name);
1155 x->aalg->alg_key_len = 0;
1156 if (key) {
1157 x->aalg->alg_key_len = key->sadb_key_bits;
1158 memcpy(x->aalg->alg_key, key+1, keysize);
1159 }
1160 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1161 x->props.aalgo = sa->sadb_sa_auth;
1162 /* x->algo.flags = sa->sadb_sa_flags; */
1163 }
1164 if (sa->sadb_sa_encrypt) {
1165 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1166 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1167 if (!a || !a->pfkey_supported) {
1168 err = -ENOSYS;
1169 goto out;
1170 }
1171 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1172 if (!x->calg)
1173 goto out;
1174 strcpy(x->calg->alg_name, a->name);
1175 x->props.calgo = sa->sadb_sa_encrypt;
1176 } else {
1177 int keysize = 0;
1178 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1179 if (!a || !a->pfkey_supported) {
1180 err = -ENOSYS;
1181 goto out;
1182 }
1183 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1184 if (key)
1185 keysize = (key->sadb_key_bits + 7) / 8;
1186 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1187 if (!x->ealg)
1188 goto out;
1189 strcpy(x->ealg->alg_name, a->name);
1190 x->ealg->alg_key_len = 0;
1191 if (key) {
1192 x->ealg->alg_key_len = key->sadb_key_bits;
1193 memcpy(x->ealg->alg_key, key+1, keysize);
1194 }
1195 x->props.ealgo = sa->sadb_sa_encrypt;
1196 }
1197 }
1198 /* x->algo.flags = sa->sadb_sa_flags; */
1199
1200 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1201 &x->props.saddr);
1202 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203 &x->id.daddr);
1204
1205 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208 if (mode < 0) {
1209 err = -EINVAL;
1210 goto out;
1211 }
1212 x->props.mode = mode;
1213 x->props.reqid = sa2->sadb_x_sa2_reqid;
1214 }
1215
1216 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218
1219 /* Nobody uses this, but we try. */
1220 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222 }
1223
1224 if (!x->sel.family)
1225 x->sel.family = x->props.family;
1226
1227 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228 const struct sadb_x_nat_t_type* n_type;
1229 struct xfrm_encap_tmpl *natt;
1230
1231 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232 if (!x->encap)
1233 goto out;
1234
1235 natt = x->encap;
1236 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238
1239 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240 const struct sadb_x_nat_t_port *n_port =
1241 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243 }
1244 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245 const struct sadb_x_nat_t_port *n_port =
1246 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248 }
1249 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250 }
1251
1252 err = xfrm_init_state(x);
1253 if (err)
1254 goto out;
1255
1256 x->km.seq = hdr->sadb_msg_seq;
1257 return x;
1258
1259 out:
1260 x->km.state = XFRM_STATE_DEAD;
1261 xfrm_state_put(x);
1262 return ERR_PTR(err);
1263 }
1264
1265 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266 {
1267 return -EOPNOTSUPP;
1268 }
1269
1270 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271 {
1272 struct net *net = sock_net(sk);
1273 struct sk_buff *resp_skb;
1274 struct sadb_x_sa2 *sa2;
1275 struct sadb_address *saddr, *daddr;
1276 struct sadb_msg *out_hdr;
1277 struct sadb_spirange *range;
1278 struct xfrm_state *x = NULL;
1279 int mode;
1280 int err;
1281 u32 min_spi, max_spi;
1282 u32 reqid;
1283 u8 proto;
1284 unsigned short family;
1285 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286
1287 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289 return -EINVAL;
1290
1291 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292 if (proto == 0)
1293 return -EINVAL;
1294
1295 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297 if (mode < 0)
1298 return -EINVAL;
1299 reqid = sa2->sadb_x_sa2_reqid;
1300 } else {
1301 mode = 0;
1302 reqid = 0;
1303 }
1304
1305 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307
1308 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309 switch (family) {
1310 case AF_INET:
1311 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313 break;
1314 #if IS_ENABLED(CONFIG_IPV6)
1315 case AF_INET6:
1316 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318 break;
1319 #endif
1320 }
1321
1322 if (hdr->sadb_msg_seq) {
1323 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1325 xfrm_state_put(x);
1326 x = NULL;
1327 }
1328 }
1329
1330 if (!x)
1331 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332
1333 if (x == NULL)
1334 return -ENOENT;
1335
1336 min_spi = 0x100;
1337 max_spi = 0x0fffffff;
1338
1339 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340 if (range) {
1341 min_spi = range->sadb_spirange_min;
1342 max_spi = range->sadb_spirange_max;
1343 }
1344
1345 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1346 if (err) {
1347 xfrm_state_put(x);
1348 return err;
1349 }
1350
1351 err = xfrm_alloc_spi(x, min_spi, max_spi);
1352 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1353
1354 if (IS_ERR(resp_skb)) {
1355 xfrm_state_put(x);
1356 return PTR_ERR(resp_skb);
1357 }
1358
1359 out_hdr = (struct sadb_msg *) resp_skb->data;
1360 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1361 out_hdr->sadb_msg_type = SADB_GETSPI;
1362 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1363 out_hdr->sadb_msg_errno = 0;
1364 out_hdr->sadb_msg_reserved = 0;
1365 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1366 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1367
1368 xfrm_state_put(x);
1369
1370 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1371
1372 return 0;
1373 }
1374
1375 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1376 {
1377 struct net *net = sock_net(sk);
1378 struct xfrm_state *x;
1379
1380 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1381 return -EOPNOTSUPP;
1382
1383 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1384 return 0;
1385
1386 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1387 if (x == NULL)
1388 return 0;
1389
1390 spin_lock_bh(&x->lock);
1391 if (x->km.state == XFRM_STATE_ACQ)
1392 x->km.state = XFRM_STATE_ERROR;
1393
1394 spin_unlock_bh(&x->lock);
1395 xfrm_state_put(x);
1396 return 0;
1397 }
1398
1399 static inline int event2poltype(int event)
1400 {
1401 switch (event) {
1402 case XFRM_MSG_DELPOLICY:
1403 return SADB_X_SPDDELETE;
1404 case XFRM_MSG_NEWPOLICY:
1405 return SADB_X_SPDADD;
1406 case XFRM_MSG_UPDPOLICY:
1407 return SADB_X_SPDUPDATE;
1408 case XFRM_MSG_POLEXPIRE:
1409 // return SADB_X_SPDEXPIRE;
1410 default:
1411 pr_err("pfkey: Unknown policy event %d\n", event);
1412 break;
1413 }
1414
1415 return 0;
1416 }
1417
1418 static inline int event2keytype(int event)
1419 {
1420 switch (event) {
1421 case XFRM_MSG_DELSA:
1422 return SADB_DELETE;
1423 case XFRM_MSG_NEWSA:
1424 return SADB_ADD;
1425 case XFRM_MSG_UPDSA:
1426 return SADB_UPDATE;
1427 case XFRM_MSG_EXPIRE:
1428 return SADB_EXPIRE;
1429 default:
1430 pr_err("pfkey: Unknown SA event %d\n", event);
1431 break;
1432 }
1433
1434 return 0;
1435 }
1436
1437 /* ADD/UPD/DEL */
1438 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1439 {
1440 struct sk_buff *skb;
1441 struct sadb_msg *hdr;
1442
1443 skb = pfkey_xfrm_state2msg(x);
1444
1445 if (IS_ERR(skb))
1446 return PTR_ERR(skb);
1447
1448 hdr = (struct sadb_msg *) skb->data;
1449 hdr->sadb_msg_version = PF_KEY_V2;
1450 hdr->sadb_msg_type = event2keytype(c->event);
1451 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1452 hdr->sadb_msg_errno = 0;
1453 hdr->sadb_msg_reserved = 0;
1454 hdr->sadb_msg_seq = c->seq;
1455 hdr->sadb_msg_pid = c->portid;
1456
1457 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1458
1459 return 0;
1460 }
1461
1462 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1463 {
1464 struct net *net = sock_net(sk);
1465 struct xfrm_state *x;
1466 int err;
1467 struct km_event c;
1468
1469 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1470 if (IS_ERR(x))
1471 return PTR_ERR(x);
1472
1473 xfrm_state_hold(x);
1474 if (hdr->sadb_msg_type == SADB_ADD)
1475 err = xfrm_state_add(x);
1476 else
1477 err = xfrm_state_update(x);
1478
1479 xfrm_audit_state_add(x, err ? 0 : 1,
1480 audit_get_loginuid(current),
1481 audit_get_sessionid(current), 0);
1482
1483 if (err < 0) {
1484 x->km.state = XFRM_STATE_DEAD;
1485 __xfrm_state_put(x);
1486 goto out;
1487 }
1488
1489 if (hdr->sadb_msg_type == SADB_ADD)
1490 c.event = XFRM_MSG_NEWSA;
1491 else
1492 c.event = XFRM_MSG_UPDSA;
1493 c.seq = hdr->sadb_msg_seq;
1494 c.portid = hdr->sadb_msg_pid;
1495 km_state_notify(x, &c);
1496 out:
1497 xfrm_state_put(x);
1498 return err;
1499 }
1500
1501 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1502 {
1503 struct net *net = sock_net(sk);
1504 struct xfrm_state *x;
1505 struct km_event c;
1506 int err;
1507
1508 if (!ext_hdrs[SADB_EXT_SA-1] ||
1509 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1510 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1511 return -EINVAL;
1512
1513 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1514 if (x == NULL)
1515 return -ESRCH;
1516
1517 if ((err = security_xfrm_state_delete(x)))
1518 goto out;
1519
1520 if (xfrm_state_kern(x)) {
1521 err = -EPERM;
1522 goto out;
1523 }
1524
1525 err = xfrm_state_delete(x);
1526
1527 if (err < 0)
1528 goto out;
1529
1530 c.seq = hdr->sadb_msg_seq;
1531 c.portid = hdr->sadb_msg_pid;
1532 c.event = XFRM_MSG_DELSA;
1533 km_state_notify(x, &c);
1534 out:
1535 xfrm_audit_state_delete(x, err ? 0 : 1,
1536 audit_get_loginuid(current),
1537 audit_get_sessionid(current), 0);
1538 xfrm_state_put(x);
1539
1540 return err;
1541 }
1542
1543 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1544 {
1545 struct net *net = sock_net(sk);
1546 __u8 proto;
1547 struct sk_buff *out_skb;
1548 struct sadb_msg *out_hdr;
1549 struct xfrm_state *x;
1550
1551 if (!ext_hdrs[SADB_EXT_SA-1] ||
1552 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1553 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1554 return -EINVAL;
1555
1556 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1557 if (x == NULL)
1558 return -ESRCH;
1559
1560 out_skb = pfkey_xfrm_state2msg(x);
1561 proto = x->id.proto;
1562 xfrm_state_put(x);
1563 if (IS_ERR(out_skb))
1564 return PTR_ERR(out_skb);
1565
1566 out_hdr = (struct sadb_msg *) out_skb->data;
1567 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1568 out_hdr->sadb_msg_type = SADB_GET;
1569 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1570 out_hdr->sadb_msg_errno = 0;
1571 out_hdr->sadb_msg_reserved = 0;
1572 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1573 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1574 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1575
1576 return 0;
1577 }
1578
1579 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1580 gfp_t allocation)
1581 {
1582 struct sk_buff *skb;
1583 struct sadb_msg *hdr;
1584 int len, auth_len, enc_len, i;
1585
1586 auth_len = xfrm_count_pfkey_auth_supported();
1587 if (auth_len) {
1588 auth_len *= sizeof(struct sadb_alg);
1589 auth_len += sizeof(struct sadb_supported);
1590 }
1591
1592 enc_len = xfrm_count_pfkey_enc_supported();
1593 if (enc_len) {
1594 enc_len *= sizeof(struct sadb_alg);
1595 enc_len += sizeof(struct sadb_supported);
1596 }
1597
1598 len = enc_len + auth_len + sizeof(struct sadb_msg);
1599
1600 skb = alloc_skb(len + 16, allocation);
1601 if (!skb)
1602 goto out_put_algs;
1603
1604 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1605 pfkey_hdr_dup(hdr, orig);
1606 hdr->sadb_msg_errno = 0;
1607 hdr->sadb_msg_len = len / sizeof(uint64_t);
1608
1609 if (auth_len) {
1610 struct sadb_supported *sp;
1611 struct sadb_alg *ap;
1612
1613 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1614 ap = (struct sadb_alg *) (sp + 1);
1615
1616 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1617 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1618
1619 for (i = 0; ; i++) {
1620 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1621 if (!aalg)
1622 break;
1623 if (!aalg->pfkey_supported)
1624 continue;
1625 if (aalg->available)
1626 *ap++ = aalg->desc;
1627 }
1628 }
1629
1630 if (enc_len) {
1631 struct sadb_supported *sp;
1632 struct sadb_alg *ap;
1633
1634 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1635 ap = (struct sadb_alg *) (sp + 1);
1636
1637 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1638 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1639
1640 for (i = 0; ; i++) {
1641 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1642 if (!ealg)
1643 break;
1644 if (!ealg->pfkey_supported)
1645 continue;
1646 if (ealg->available)
1647 *ap++ = ealg->desc;
1648 }
1649 }
1650
1651 out_put_algs:
1652 return skb;
1653 }
1654
1655 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1656 {
1657 struct pfkey_sock *pfk = pfkey_sk(sk);
1658 struct sk_buff *supp_skb;
1659
1660 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1661 return -EINVAL;
1662
1663 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1664 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1665 return -EEXIST;
1666 pfk->registered |= (1<<hdr->sadb_msg_satype);
1667 }
1668
1669 xfrm_probe_algs();
1670
1671 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1672 if (!supp_skb) {
1673 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1674 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1675
1676 return -ENOBUFS;
1677 }
1678
1679 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1680
1681 return 0;
1682 }
1683
1684 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1685 {
1686 struct sk_buff *skb;
1687 struct sadb_msg *hdr;
1688
1689 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1690 if (!skb)
1691 return -ENOBUFS;
1692
1693 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1694 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1695 hdr->sadb_msg_errno = (uint8_t) 0;
1696 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1697
1698 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1699 }
1700
1701 static int key_notify_sa_flush(const struct km_event *c)
1702 {
1703 struct sk_buff *skb;
1704 struct sadb_msg *hdr;
1705
1706 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1707 if (!skb)
1708 return -ENOBUFS;
1709 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1710 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1711 hdr->sadb_msg_type = SADB_FLUSH;
1712 hdr->sadb_msg_seq = c->seq;
1713 hdr->sadb_msg_pid = c->portid;
1714 hdr->sadb_msg_version = PF_KEY_V2;
1715 hdr->sadb_msg_errno = (uint8_t) 0;
1716 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1717 hdr->sadb_msg_reserved = 0;
1718
1719 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1720
1721 return 0;
1722 }
1723
1724 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1725 {
1726 struct net *net = sock_net(sk);
1727 unsigned int proto;
1728 struct km_event c;
1729 struct xfrm_audit audit_info;
1730 int err, err2;
1731
1732 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1733 if (proto == 0)
1734 return -EINVAL;
1735
1736 audit_info.loginuid = audit_get_loginuid(current);
1737 audit_info.sessionid = audit_get_sessionid(current);
1738 audit_info.secid = 0;
1739 err = xfrm_state_flush(net, proto, &audit_info);
1740 err2 = unicast_flush_resp(sk, hdr);
1741 if (err || err2) {
1742 if (err == -ESRCH) /* empty table - go quietly */
1743 err = 0;
1744 return err ? err : err2;
1745 }
1746
1747 c.data.proto = proto;
1748 c.seq = hdr->sadb_msg_seq;
1749 c.portid = hdr->sadb_msg_pid;
1750 c.event = XFRM_MSG_FLUSHSA;
1751 c.net = net;
1752 km_state_notify(NULL, &c);
1753
1754 return 0;
1755 }
1756
1757 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1758 {
1759 struct pfkey_sock *pfk = ptr;
1760 struct sk_buff *out_skb;
1761 struct sadb_msg *out_hdr;
1762
1763 if (!pfkey_can_dump(&pfk->sk))
1764 return -ENOBUFS;
1765
1766 out_skb = pfkey_xfrm_state2msg(x);
1767 if (IS_ERR(out_skb))
1768 return PTR_ERR(out_skb);
1769
1770 out_hdr = (struct sadb_msg *) out_skb->data;
1771 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1772 out_hdr->sadb_msg_type = SADB_DUMP;
1773 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1774 out_hdr->sadb_msg_errno = 0;
1775 out_hdr->sadb_msg_reserved = 0;
1776 out_hdr->sadb_msg_seq = count + 1;
1777 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1778
1779 if (pfk->dump.skb)
1780 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1781 &pfk->sk, sock_net(&pfk->sk));
1782 pfk->dump.skb = out_skb;
1783
1784 return 0;
1785 }
1786
1787 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1788 {
1789 struct net *net = sock_net(&pfk->sk);
1790 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1791 }
1792
1793 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1794 {
1795 struct net *net = sock_net(&pfk->sk);
1796
1797 xfrm_state_walk_done(&pfk->dump.u.state, net);
1798 }
1799
1800 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1801 {
1802 u8 proto;
1803 struct xfrm_address_filter *filter = NULL;
1804 struct pfkey_sock *pfk = pfkey_sk(sk);
1805
1806 if (pfk->dump.dump != NULL)
1807 return -EBUSY;
1808
1809 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1810 if (proto == 0)
1811 return -EINVAL;
1812
1813 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1814 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1815
1816 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1817 if (filter == NULL)
1818 return -ENOMEM;
1819
1820 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1821 sizeof(xfrm_address_t));
1822 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1823 sizeof(xfrm_address_t));
1824 filter->family = xfilter->sadb_x_filter_family;
1825 filter->splen = xfilter->sadb_x_filter_splen;
1826 filter->dplen = xfilter->sadb_x_filter_dplen;
1827 }
1828
1829 pfk->dump.msg_version = hdr->sadb_msg_version;
1830 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1831 pfk->dump.dump = pfkey_dump_sa;
1832 pfk->dump.done = pfkey_dump_sa_done;
1833 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1834
1835 return pfkey_do_dump(pfk);
1836 }
1837
1838 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1839 {
1840 struct pfkey_sock *pfk = pfkey_sk(sk);
1841 int satype = hdr->sadb_msg_satype;
1842 bool reset_errno = false;
1843
1844 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1845 reset_errno = true;
1846 if (satype != 0 && satype != 1)
1847 return -EINVAL;
1848 pfk->promisc = satype;
1849 }
1850 if (reset_errno && skb_cloned(skb))
1851 skb = skb_copy(skb, GFP_KERNEL);
1852 else
1853 skb = skb_clone(skb, GFP_KERNEL);
1854
1855 if (reset_errno && skb) {
1856 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1857 new_hdr->sadb_msg_errno = 0;
1858 }
1859
1860 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1861 return 0;
1862 }
1863
1864 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1865 {
1866 int i;
1867 u32 reqid = *(u32*)ptr;
1868
1869 for (i=0; i<xp->xfrm_nr; i++) {
1870 if (xp->xfrm_vec[i].reqid == reqid)
1871 return -EEXIST;
1872 }
1873 return 0;
1874 }
1875
1876 static u32 gen_reqid(struct net *net)
1877 {
1878 struct xfrm_policy_walk walk;
1879 u32 start;
1880 int rc;
1881 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1882
1883 start = reqid;
1884 do {
1885 ++reqid;
1886 if (reqid == 0)
1887 reqid = IPSEC_MANUAL_REQID_MAX+1;
1888 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1889 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1890 xfrm_policy_walk_done(&walk, net);
1891 if (rc != -EEXIST)
1892 return reqid;
1893 } while (reqid != start);
1894 return 0;
1895 }
1896
1897 static int
1898 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1899 {
1900 struct net *net = xp_net(xp);
1901 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1902 int mode;
1903
1904 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1905 return -ELOOP;
1906
1907 if (rq->sadb_x_ipsecrequest_mode == 0)
1908 return -EINVAL;
1909
1910 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1911 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1912 return -EINVAL;
1913 t->mode = mode;
1914 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1915 t->optional = 1;
1916 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1917 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1918 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1919 t->reqid = 0;
1920 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1921 return -ENOBUFS;
1922 }
1923
1924 /* addresses present only in tunnel mode */
1925 if (t->mode == XFRM_MODE_TUNNEL) {
1926 u8 *sa = (u8 *) (rq + 1);
1927 int family, socklen;
1928
1929 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1930 &t->saddr);
1931 if (!family)
1932 return -EINVAL;
1933
1934 socklen = pfkey_sockaddr_len(family);
1935 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1936 &t->id.daddr) != family)
1937 return -EINVAL;
1938 t->encap_family = family;
1939 } else
1940 t->encap_family = xp->family;
1941
1942 /* No way to set this via kame pfkey */
1943 t->allalgs = 1;
1944 xp->xfrm_nr++;
1945 return 0;
1946 }
1947
1948 static int
1949 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1950 {
1951 int err;
1952 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1953 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1954
1955 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1956 return -EINVAL;
1957
1958 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1959 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1960 return err;
1961 len -= rq->sadb_x_ipsecrequest_len;
1962 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1963 }
1964 return 0;
1965 }
1966
1967 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1968 {
1969 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1970
1971 if (xfrm_ctx) {
1972 int len = sizeof(struct sadb_x_sec_ctx);
1973 len += xfrm_ctx->ctx_len;
1974 return PFKEY_ALIGN8(len);
1975 }
1976 return 0;
1977 }
1978
1979 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1980 {
1981 const struct xfrm_tmpl *t;
1982 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1983 int socklen = 0;
1984 int i;
1985
1986 for (i=0; i<xp->xfrm_nr; i++) {
1987 t = xp->xfrm_vec + i;
1988 socklen += pfkey_sockaddr_len(t->encap_family);
1989 }
1990
1991 return sizeof(struct sadb_msg) +
1992 (sizeof(struct sadb_lifetime) * 3) +
1993 (sizeof(struct sadb_address) * 2) +
1994 (sockaddr_size * 2) +
1995 sizeof(struct sadb_x_policy) +
1996 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1997 (socklen * 2) +
1998 pfkey_xfrm_policy2sec_ctx_size(xp);
1999 }
2000
2001 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2002 {
2003 struct sk_buff *skb;
2004 int size;
2005
2006 size = pfkey_xfrm_policy2msg_size(xp);
2007
2008 skb = alloc_skb(size + 16, GFP_ATOMIC);
2009 if (skb == NULL)
2010 return ERR_PTR(-ENOBUFS);
2011
2012 return skb;
2013 }
2014
2015 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2016 {
2017 struct sadb_msg *hdr;
2018 struct sadb_address *addr;
2019 struct sadb_lifetime *lifetime;
2020 struct sadb_x_policy *pol;
2021 struct sadb_x_sec_ctx *sec_ctx;
2022 struct xfrm_sec_ctx *xfrm_ctx;
2023 int i;
2024 int size;
2025 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2026 int socklen = pfkey_sockaddr_len(xp->family);
2027
2028 size = pfkey_xfrm_policy2msg_size(xp);
2029
2030 /* call should fill header later */
2031 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2032 memset(hdr, 0, size); /* XXX do we need this ? */
2033
2034 /* src address */
2035 addr = (struct sadb_address*) skb_put(skb,
2036 sizeof(struct sadb_address)+sockaddr_size);
2037 addr->sadb_address_len =
2038 (sizeof(struct sadb_address)+sockaddr_size)/
2039 sizeof(uint64_t);
2040 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2041 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2042 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2043 addr->sadb_address_reserved = 0;
2044 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2045 xp->selector.sport,
2046 (struct sockaddr *) (addr + 1),
2047 xp->family))
2048 BUG();
2049
2050 /* dst address */
2051 addr = (struct sadb_address*) skb_put(skb,
2052 sizeof(struct sadb_address)+sockaddr_size);
2053 addr->sadb_address_len =
2054 (sizeof(struct sadb_address)+sockaddr_size)/
2055 sizeof(uint64_t);
2056 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2057 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2058 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2059 addr->sadb_address_reserved = 0;
2060
2061 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2062 (struct sockaddr *) (addr + 1),
2063 xp->family);
2064
2065 /* hard time */
2066 lifetime = (struct sadb_lifetime *) skb_put(skb,
2067 sizeof(struct sadb_lifetime));
2068 lifetime->sadb_lifetime_len =
2069 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2070 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2071 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2072 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2073 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2074 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2075 /* soft time */
2076 lifetime = (struct sadb_lifetime *) skb_put(skb,
2077 sizeof(struct sadb_lifetime));
2078 lifetime->sadb_lifetime_len =
2079 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2080 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2081 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2082 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2083 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2084 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2085 /* current time */
2086 lifetime = (struct sadb_lifetime *) skb_put(skb,
2087 sizeof(struct sadb_lifetime));
2088 lifetime->sadb_lifetime_len =
2089 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2090 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2091 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2092 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2093 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2094 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2095
2096 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2097 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2098 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2099 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2100 if (xp->action == XFRM_POLICY_ALLOW) {
2101 if (xp->xfrm_nr)
2102 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2103 else
2104 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2105 }
2106 pol->sadb_x_policy_dir = dir+1;
2107 pol->sadb_x_policy_reserved = 0;
2108 pol->sadb_x_policy_id = xp->index;
2109 pol->sadb_x_policy_priority = xp->priority;
2110
2111 for (i=0; i<xp->xfrm_nr; i++) {
2112 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2113 struct sadb_x_ipsecrequest *rq;
2114 int req_size;
2115 int mode;
2116
2117 req_size = sizeof(struct sadb_x_ipsecrequest);
2118 if (t->mode == XFRM_MODE_TUNNEL) {
2119 socklen = pfkey_sockaddr_len(t->encap_family);
2120 req_size += socklen * 2;
2121 } else {
2122 size -= 2*socklen;
2123 }
2124 rq = (void*)skb_put(skb, req_size);
2125 pol->sadb_x_policy_len += req_size/8;
2126 memset(rq, 0, sizeof(*rq));
2127 rq->sadb_x_ipsecrequest_len = req_size;
2128 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2129 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2130 return -EINVAL;
2131 rq->sadb_x_ipsecrequest_mode = mode;
2132 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2133 if (t->reqid)
2134 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2135 if (t->optional)
2136 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2137 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2138
2139 if (t->mode == XFRM_MODE_TUNNEL) {
2140 u8 *sa = (void *)(rq + 1);
2141 pfkey_sockaddr_fill(&t->saddr, 0,
2142 (struct sockaddr *)sa,
2143 t->encap_family);
2144 pfkey_sockaddr_fill(&t->id.daddr, 0,
2145 (struct sockaddr *) (sa + socklen),
2146 t->encap_family);
2147 }
2148 }
2149
2150 /* security context */
2151 if ((xfrm_ctx = xp->security)) {
2152 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2153
2154 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2155 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2156 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2157 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2158 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2159 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2160 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2161 xfrm_ctx->ctx_len);
2162 }
2163
2164 hdr->sadb_msg_len = size / sizeof(uint64_t);
2165 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2166
2167 return 0;
2168 }
2169
2170 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2171 {
2172 struct sk_buff *out_skb;
2173 struct sadb_msg *out_hdr;
2174 int err;
2175
2176 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2177 if (IS_ERR(out_skb))
2178 return PTR_ERR(out_skb);
2179
2180 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2181 if (err < 0)
2182 return err;
2183
2184 out_hdr = (struct sadb_msg *) out_skb->data;
2185 out_hdr->sadb_msg_version = PF_KEY_V2;
2186
2187 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2188 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2189 else
2190 out_hdr->sadb_msg_type = event2poltype(c->event);
2191 out_hdr->sadb_msg_errno = 0;
2192 out_hdr->sadb_msg_seq = c->seq;
2193 out_hdr->sadb_msg_pid = c->portid;
2194 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2195 return 0;
2196
2197 }
2198
2199 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2200 {
2201 struct net *net = sock_net(sk);
2202 int err = 0;
2203 struct sadb_lifetime *lifetime;
2204 struct sadb_address *sa;
2205 struct sadb_x_policy *pol;
2206 struct xfrm_policy *xp;
2207 struct km_event c;
2208 struct sadb_x_sec_ctx *sec_ctx;
2209
2210 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2211 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2212 !ext_hdrs[SADB_X_EXT_POLICY-1])
2213 return -EINVAL;
2214
2215 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2216 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2217 return -EINVAL;
2218 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2219 return -EINVAL;
2220
2221 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2222 if (xp == NULL)
2223 return -ENOBUFS;
2224
2225 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2226 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2227 xp->priority = pol->sadb_x_policy_priority;
2228
2229 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2230 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2231 xp->selector.family = xp->family;
2232 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2233 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2234 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2235 if (xp->selector.sport)
2236 xp->selector.sport_mask = htons(0xffff);
2237
2238 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2239 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2240 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2241
2242 /* Amusing, we set this twice. KAME apps appear to set same value
2243 * in both addresses.
2244 */
2245 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2246
2247 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2248 if (xp->selector.dport)
2249 xp->selector.dport_mask = htons(0xffff);
2250
2251 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2252 if (sec_ctx != NULL) {
2253 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2254
2255 if (!uctx) {
2256 err = -ENOBUFS;
2257 goto out;
2258 }
2259
2260 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2261 kfree(uctx);
2262
2263 if (err)
2264 goto out;
2265 }
2266
2267 xp->lft.soft_byte_limit = XFRM_INF;
2268 xp->lft.hard_byte_limit = XFRM_INF;
2269 xp->lft.soft_packet_limit = XFRM_INF;
2270 xp->lft.hard_packet_limit = XFRM_INF;
2271 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2272 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2273 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2274 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2275 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2276 }
2277 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2278 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2279 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2280 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2281 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2282 }
2283 xp->xfrm_nr = 0;
2284 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2285 (err = parse_ipsecrequests(xp, pol)) < 0)
2286 goto out;
2287
2288 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2289 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2290
2291 xfrm_audit_policy_add(xp, err ? 0 : 1,
2292 audit_get_loginuid(current),
2293 audit_get_sessionid(current), 0);
2294
2295 if (err)
2296 goto out;
2297
2298 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2299 c.event = XFRM_MSG_UPDPOLICY;
2300 else
2301 c.event = XFRM_MSG_NEWPOLICY;
2302
2303 c.seq = hdr->sadb_msg_seq;
2304 c.portid = hdr->sadb_msg_pid;
2305
2306 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2307 xfrm_pol_put(xp);
2308 return 0;
2309
2310 out:
2311 xp->walk.dead = 1;
2312 xfrm_policy_destroy(xp);
2313 return err;
2314 }
2315
2316 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2317 {
2318 struct net *net = sock_net(sk);
2319 int err;
2320 struct sadb_address *sa;
2321 struct sadb_x_policy *pol;
2322 struct xfrm_policy *xp;
2323 struct xfrm_selector sel;
2324 struct km_event c;
2325 struct sadb_x_sec_ctx *sec_ctx;
2326 struct xfrm_sec_ctx *pol_ctx = NULL;
2327
2328 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2329 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2330 !ext_hdrs[SADB_X_EXT_POLICY-1])
2331 return -EINVAL;
2332
2333 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2334 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2335 return -EINVAL;
2336
2337 memset(&sel, 0, sizeof(sel));
2338
2339 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2340 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2341 sel.prefixlen_s = sa->sadb_address_prefixlen;
2342 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2343 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2344 if (sel.sport)
2345 sel.sport_mask = htons(0xffff);
2346
2347 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2348 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2349 sel.prefixlen_d = sa->sadb_address_prefixlen;
2350 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2351 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2352 if (sel.dport)
2353 sel.dport_mask = htons(0xffff);
2354
2355 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2356 if (sec_ctx != NULL) {
2357 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2358
2359 if (!uctx)
2360 return -ENOMEM;
2361
2362 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2363 kfree(uctx);
2364 if (err)
2365 return err;
2366 }
2367
2368 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2369 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2370 1, &err);
2371 security_xfrm_policy_free(pol_ctx);
2372 if (xp == NULL)
2373 return -ENOENT;
2374
2375 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2376 audit_get_loginuid(current),
2377 audit_get_sessionid(current), 0);
2378
2379 if (err)
2380 goto out;
2381
2382 c.seq = hdr->sadb_msg_seq;
2383 c.portid = hdr->sadb_msg_pid;
2384 c.data.byid = 0;
2385 c.event = XFRM_MSG_DELPOLICY;
2386 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2387
2388 out:
2389 xfrm_pol_put(xp);
2390 if (err == 0)
2391 xfrm_garbage_collect(net);
2392 return err;
2393 }
2394
2395 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2396 {
2397 int err;
2398 struct sk_buff *out_skb;
2399 struct sadb_msg *out_hdr;
2400 err = 0;
2401
2402 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2403 if (IS_ERR(out_skb)) {
2404 err = PTR_ERR(out_skb);
2405 goto out;
2406 }
2407 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2408 if (err < 0)
2409 goto out;
2410
2411 out_hdr = (struct sadb_msg *) out_skb->data;
2412 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2413 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2414 out_hdr->sadb_msg_satype = 0;
2415 out_hdr->sadb_msg_errno = 0;
2416 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2417 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2418 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2419 err = 0;
2420
2421 out:
2422 return err;
2423 }
2424
2425 #ifdef CONFIG_NET_KEY_MIGRATE
2426 static int pfkey_sockaddr_pair_size(sa_family_t family)
2427 {
2428 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2429 }
2430
2431 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2432 xfrm_address_t *saddr, xfrm_address_t *daddr,
2433 u16 *family)
2434 {
2435 int af, socklen;
2436
2437 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2438 return -EINVAL;
2439
2440 af = pfkey_sockaddr_extract(sa, saddr);
2441 if (!af)
2442 return -EINVAL;
2443
2444 socklen = pfkey_sockaddr_len(af);
2445 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2446 daddr) != af)
2447 return -EINVAL;
2448
2449 *family = af;
2450 return 0;
2451 }
2452
2453 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2454 struct xfrm_migrate *m)
2455 {
2456 int err;
2457 struct sadb_x_ipsecrequest *rq2;
2458 int mode;
2459
2460 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2461 len < rq1->sadb_x_ipsecrequest_len)
2462 return -EINVAL;
2463
2464 /* old endoints */
2465 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2466 rq1->sadb_x_ipsecrequest_len,
2467 &m->old_saddr, &m->old_daddr,
2468 &m->old_family);
2469 if (err)
2470 return err;
2471
2472 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2473 len -= rq1->sadb_x_ipsecrequest_len;
2474
2475 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2476 len < rq2->sadb_x_ipsecrequest_len)
2477 return -EINVAL;
2478
2479 /* new endpoints */
2480 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2481 rq2->sadb_x_ipsecrequest_len,
2482 &m->new_saddr, &m->new_daddr,
2483 &m->new_family);
2484 if (err)
2485 return err;
2486
2487 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2488 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2489 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2490 return -EINVAL;
2491
2492 m->proto = rq1->sadb_x_ipsecrequest_proto;
2493 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2494 return -EINVAL;
2495 m->mode = mode;
2496 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2497
2498 return ((int)(rq1->sadb_x_ipsecrequest_len +
2499 rq2->sadb_x_ipsecrequest_len));
2500 }
2501
2502 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2503 const struct sadb_msg *hdr, void * const *ext_hdrs)
2504 {
2505 int i, len, ret, err = -EINVAL;
2506 u8 dir;
2507 struct sadb_address *sa;
2508 struct sadb_x_kmaddress *kma;
2509 struct sadb_x_policy *pol;
2510 struct sadb_x_ipsecrequest *rq;
2511 struct xfrm_selector sel;
2512 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2513 struct xfrm_kmaddress k;
2514 struct net *net = sock_net(sk);
2515
2516 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2517 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2518 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2519 err = -EINVAL;
2520 goto out;
2521 }
2522
2523 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2524 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2525
2526 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2527 err = -EINVAL;
2528 goto out;
2529 }
2530
2531 if (kma) {
2532 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2533 k.reserved = kma->sadb_x_kmaddress_reserved;
2534 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2535 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2536 &k.local, &k.remote, &k.family);
2537 if (ret < 0) {
2538 err = ret;
2539 goto out;
2540 }
2541 }
2542
2543 dir = pol->sadb_x_policy_dir - 1;
2544 memset(&sel, 0, sizeof(sel));
2545
2546 /* set source address info of selector */
2547 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2548 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2549 sel.prefixlen_s = sa->sadb_address_prefixlen;
2550 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2551 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2552 if (sel.sport)
2553 sel.sport_mask = htons(0xffff);
2554
2555 /* set destination address info of selector */
2556 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2557 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2558 sel.prefixlen_d = sa->sadb_address_prefixlen;
2559 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2560 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2561 if (sel.dport)
2562 sel.dport_mask = htons(0xffff);
2563
2564 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2565
2566 /* extract ipsecrequests */
2567 i = 0;
2568 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2569
2570 while (len > 0 && i < XFRM_MAX_DEPTH) {
2571 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2572 if (ret < 0) {
2573 err = ret;
2574 goto out;
2575 } else {
2576 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2577 len -= ret;
2578 i++;
2579 }
2580 }
2581
2582 if (!i || len > 0) {
2583 err = -EINVAL;
2584 goto out;
2585 }
2586
2587 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2588 kma ? &k : NULL, net);
2589
2590 out:
2591 return err;
2592 }
2593 #else
2594 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2595 const struct sadb_msg *hdr, void * const *ext_hdrs)
2596 {
2597 return -ENOPROTOOPT;
2598 }
2599 #endif
2600
2601
2602 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2603 {
2604 struct net *net = sock_net(sk);
2605 unsigned int dir;
2606 int err = 0, delete;
2607 struct sadb_x_policy *pol;
2608 struct xfrm_policy *xp;
2609 struct km_event c;
2610
2611 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2612 return -EINVAL;
2613
2614 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2615 if (dir >= XFRM_POLICY_MAX)
2616 return -EINVAL;
2617
2618 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2619 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2620 dir, pol->sadb_x_policy_id, delete, &err);
2621 if (xp == NULL)
2622 return -ENOENT;
2623
2624 if (delete) {
2625 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2626 audit_get_loginuid(current),
2627 audit_get_sessionid(current), 0);
2628
2629 if (err)
2630 goto out;
2631 c.seq = hdr->sadb_msg_seq;
2632 c.portid = hdr->sadb_msg_pid;
2633 c.data.byid = 1;
2634 c.event = XFRM_MSG_DELPOLICY;
2635 km_policy_notify(xp, dir, &c);
2636 } else {
2637 err = key_pol_get_resp(sk, xp, hdr, dir);
2638 }
2639
2640 out:
2641 xfrm_pol_put(xp);
2642 if (delete && err == 0)
2643 xfrm_garbage_collect(net);
2644 return err;
2645 }
2646
2647 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2648 {
2649 struct pfkey_sock *pfk = ptr;
2650 struct sk_buff *out_skb;
2651 struct sadb_msg *out_hdr;
2652 int err;
2653
2654 if (!pfkey_can_dump(&pfk->sk))
2655 return -ENOBUFS;
2656
2657 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2658 if (IS_ERR(out_skb))
2659 return PTR_ERR(out_skb);
2660
2661 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2662 if (err < 0)
2663 return err;
2664
2665 out_hdr = (struct sadb_msg *) out_skb->data;
2666 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2667 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2668 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2669 out_hdr->sadb_msg_errno = 0;
2670 out_hdr->sadb_msg_seq = count + 1;
2671 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2672
2673 if (pfk->dump.skb)
2674 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2675 &pfk->sk, sock_net(&pfk->sk));
2676 pfk->dump.skb = out_skb;
2677
2678 return 0;
2679 }
2680
2681 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2682 {
2683 struct net *net = sock_net(&pfk->sk);
2684 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2685 }
2686
2687 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2688 {
2689 struct net *net = sock_net((struct sock *)pfk);
2690
2691 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2692 }
2693
2694 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2695 {
2696 struct pfkey_sock *pfk = pfkey_sk(sk);
2697
2698 if (pfk->dump.dump != NULL)
2699 return -EBUSY;
2700
2701 pfk->dump.msg_version = hdr->sadb_msg_version;
2702 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2703 pfk->dump.dump = pfkey_dump_sp;
2704 pfk->dump.done = pfkey_dump_sp_done;
2705 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2706
2707 return pfkey_do_dump(pfk);
2708 }
2709
2710 static int key_notify_policy_flush(const struct km_event *c)
2711 {
2712 struct sk_buff *skb_out;
2713 struct sadb_msg *hdr;
2714
2715 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2716 if (!skb_out)
2717 return -ENOBUFS;
2718 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2719 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2720 hdr->sadb_msg_seq = c->seq;
2721 hdr->sadb_msg_pid = c->portid;
2722 hdr->sadb_msg_version = PF_KEY_V2;
2723 hdr->sadb_msg_errno = (uint8_t) 0;
2724 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2725 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2726 hdr->sadb_msg_reserved = 0;
2727 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2728 return 0;
2729
2730 }
2731
2732 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2733 {
2734 struct net *net = sock_net(sk);
2735 struct km_event c;
2736 struct xfrm_audit audit_info;
2737 int err, err2;
2738
2739 audit_info.loginuid = audit_get_loginuid(current);
2740 audit_info.sessionid = audit_get_sessionid(current);
2741 audit_info.secid = 0;
2742 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2743 err2 = unicast_flush_resp(sk, hdr);
2744 if (err || err2) {
2745 if (err == -ESRCH) /* empty table - old silent behavior */
2746 return 0;
2747 return err;
2748 }
2749
2750 c.data.type = XFRM_POLICY_TYPE_MAIN;
2751 c.event = XFRM_MSG_FLUSHPOLICY;
2752 c.portid = hdr->sadb_msg_pid;
2753 c.seq = hdr->sadb_msg_seq;
2754 c.net = net;
2755 km_policy_notify(NULL, 0, &c);
2756
2757 return 0;
2758 }
2759
2760 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2761 const struct sadb_msg *hdr, void * const *ext_hdrs);
2762 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2763 [SADB_RESERVED] = pfkey_reserved,
2764 [SADB_GETSPI] = pfkey_getspi,
2765 [SADB_UPDATE] = pfkey_add,
2766 [SADB_ADD] = pfkey_add,
2767 [SADB_DELETE] = pfkey_delete,
2768 [SADB_GET] = pfkey_get,
2769 [SADB_ACQUIRE] = pfkey_acquire,
2770 [SADB_REGISTER] = pfkey_register,
2771 [SADB_EXPIRE] = NULL,
2772 [SADB_FLUSH] = pfkey_flush,
2773 [SADB_DUMP] = pfkey_dump,
2774 [SADB_X_PROMISC] = pfkey_promisc,
2775 [SADB_X_PCHANGE] = NULL,
2776 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2777 [SADB_X_SPDADD] = pfkey_spdadd,
2778 [SADB_X_SPDDELETE] = pfkey_spddelete,
2779 [SADB_X_SPDGET] = pfkey_spdget,
2780 [SADB_X_SPDACQUIRE] = NULL,
2781 [SADB_X_SPDDUMP] = pfkey_spddump,
2782 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2783 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2784 [SADB_X_SPDDELETE2] = pfkey_spdget,
2785 [SADB_X_MIGRATE] = pfkey_migrate,
2786 };
2787
2788 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2789 {
2790 void *ext_hdrs[SADB_EXT_MAX];
2791 int err;
2792
2793 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2794 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2795
2796 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2797 err = parse_exthdrs(skb, hdr, ext_hdrs);
2798 if (!err) {
2799 err = -EOPNOTSUPP;
2800 if (pfkey_funcs[hdr->sadb_msg_type])
2801 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2802 }
2803 return err;
2804 }
2805
2806 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2807 {
2808 struct sadb_msg *hdr = NULL;
2809
2810 if (skb->len < sizeof(*hdr)) {
2811 *errp = -EMSGSIZE;
2812 } else {
2813 hdr = (struct sadb_msg *) skb->data;
2814 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2815 hdr->sadb_msg_reserved != 0 ||
2816 (hdr->sadb_msg_type <= SADB_RESERVED ||
2817 hdr->sadb_msg_type > SADB_MAX)) {
2818 hdr = NULL;
2819 *errp = -EINVAL;
2820 } else if (hdr->sadb_msg_len != (skb->len /
2821 sizeof(uint64_t)) ||
2822 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2823 sizeof(uint64_t))) {
2824 hdr = NULL;
2825 *errp = -EMSGSIZE;
2826 } else {
2827 *errp = 0;
2828 }
2829 }
2830 return hdr;
2831 }
2832
2833 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2834 const struct xfrm_algo_desc *d)
2835 {
2836 unsigned int id = d->desc.sadb_alg_id;
2837
2838 if (id >= sizeof(t->aalgos) * 8)
2839 return 0;
2840
2841 return (t->aalgos >> id) & 1;
2842 }
2843
2844 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2845 const struct xfrm_algo_desc *d)
2846 {
2847 unsigned int id = d->desc.sadb_alg_id;
2848
2849 if (id >= sizeof(t->ealgos) * 8)
2850 return 0;
2851
2852 return (t->ealgos >> id) & 1;
2853 }
2854
2855 static int count_ah_combs(const struct xfrm_tmpl *t)
2856 {
2857 int i, sz = 0;
2858
2859 for (i = 0; ; i++) {
2860 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2861 if (!aalg)
2862 break;
2863 if (!aalg->pfkey_supported)
2864 continue;
2865 if (aalg_tmpl_set(t, aalg) && aalg->available)
2866 sz += sizeof(struct sadb_comb);
2867 }
2868 return sz + sizeof(struct sadb_prop);
2869 }
2870
2871 static int count_esp_combs(const struct xfrm_tmpl *t)
2872 {
2873 int i, k, sz = 0;
2874
2875 for (i = 0; ; i++) {
2876 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2877 if (!ealg)
2878 break;
2879
2880 if (!ealg->pfkey_supported)
2881 continue;
2882
2883 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2884 continue;
2885
2886 for (k = 1; ; k++) {
2887 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2888 if (!aalg)
2889 break;
2890
2891 if (!aalg->pfkey_supported)
2892 continue;
2893
2894 if (aalg_tmpl_set(t, aalg) && aalg->available)
2895 sz += sizeof(struct sadb_comb);
2896 }
2897 }
2898 return sz + sizeof(struct sadb_prop);
2899 }
2900
2901 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2902 {
2903 struct sadb_prop *p;
2904 int i;
2905
2906 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2907 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2908 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2909 p->sadb_prop_replay = 32;
2910 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2911
2912 for (i = 0; ; i++) {
2913 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2914 if (!aalg)
2915 break;
2916
2917 if (!aalg->pfkey_supported)
2918 continue;
2919
2920 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2921 struct sadb_comb *c;
2922 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2923 memset(c, 0, sizeof(*c));
2924 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2925 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2926 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2927 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2928 c->sadb_comb_hard_addtime = 24*60*60;
2929 c->sadb_comb_soft_addtime = 20*60*60;
2930 c->sadb_comb_hard_usetime = 8*60*60;
2931 c->sadb_comb_soft_usetime = 7*60*60;
2932 }
2933 }
2934 }
2935
2936 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2937 {
2938 struct sadb_prop *p;
2939 int i, k;
2940
2941 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2942 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2943 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2944 p->sadb_prop_replay = 32;
2945 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2946
2947 for (i=0; ; i++) {
2948 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2949 if (!ealg)
2950 break;
2951
2952 if (!ealg->pfkey_supported)
2953 continue;
2954
2955 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2956 continue;
2957
2958 for (k = 1; ; k++) {
2959 struct sadb_comb *c;
2960 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2961 if (!aalg)
2962 break;
2963 if (!aalg->pfkey_supported)
2964 continue;
2965 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2966 continue;
2967 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2968 memset(c, 0, sizeof(*c));
2969 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2970 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2971 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2972 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2973 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2974 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2975 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2976 c->sadb_comb_hard_addtime = 24*60*60;
2977 c->sadb_comb_soft_addtime = 20*60*60;
2978 c->sadb_comb_hard_usetime = 8*60*60;
2979 c->sadb_comb_soft_usetime = 7*60*60;
2980 }
2981 }
2982 }
2983
2984 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2985 {
2986 return 0;
2987 }
2988
2989 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2990 {
2991 struct sk_buff *out_skb;
2992 struct sadb_msg *out_hdr;
2993 int hard;
2994 int hsc;
2995
2996 hard = c->data.hard;
2997 if (hard)
2998 hsc = 2;
2999 else
3000 hsc = 1;
3001
3002 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3003 if (IS_ERR(out_skb))
3004 return PTR_ERR(out_skb);
3005
3006 out_hdr = (struct sadb_msg *) out_skb->data;
3007 out_hdr->sadb_msg_version = PF_KEY_V2;
3008 out_hdr->sadb_msg_type = SADB_EXPIRE;
3009 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3010 out_hdr->sadb_msg_errno = 0;
3011 out_hdr->sadb_msg_reserved = 0;
3012 out_hdr->sadb_msg_seq = 0;
3013 out_hdr->sadb_msg_pid = 0;
3014
3015 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3016 return 0;
3017 }
3018
3019 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3020 {
3021 struct net *net = x ? xs_net(x) : c->net;
3022 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3023
3024 if (atomic_read(&net_pfkey->socks_nr) == 0)
3025 return 0;
3026
3027 switch (c->event) {
3028 case XFRM_MSG_EXPIRE:
3029 return key_notify_sa_expire(x, c);
3030 case XFRM_MSG_DELSA:
3031 case XFRM_MSG_NEWSA:
3032 case XFRM_MSG_UPDSA:
3033 return key_notify_sa(x, c);
3034 case XFRM_MSG_FLUSHSA:
3035 return key_notify_sa_flush(c);
3036 case XFRM_MSG_NEWAE: /* not yet supported */
3037 break;
3038 default:
3039 pr_err("pfkey: Unknown SA event %d\n", c->event);
3040 break;
3041 }
3042
3043 return 0;
3044 }
3045
3046 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3047 {
3048 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3049 return 0;
3050
3051 switch (c->event) {
3052 case XFRM_MSG_POLEXPIRE:
3053 return key_notify_policy_expire(xp, c);
3054 case XFRM_MSG_DELPOLICY:
3055 case XFRM_MSG_NEWPOLICY:
3056 case XFRM_MSG_UPDPOLICY:
3057 return key_notify_policy(xp, dir, c);
3058 case XFRM_MSG_FLUSHPOLICY:
3059 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3060 break;
3061 return key_notify_policy_flush(c);
3062 default:
3063 pr_err("pfkey: Unknown policy event %d\n", c->event);
3064 break;
3065 }
3066
3067 return 0;
3068 }
3069
3070 static u32 get_acqseq(void)
3071 {
3072 u32 res;
3073 static atomic_t acqseq;
3074
3075 do {
3076 res = atomic_inc_return(&acqseq);
3077 } while (!res);
3078 return res;
3079 }
3080
3081 static bool pfkey_is_alive(const struct km_event *c)
3082 {
3083 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3084 struct sock *sk;
3085 bool is_alive = false;
3086
3087 rcu_read_lock();
3088 sk_for_each_rcu(sk, &net_pfkey->table) {
3089 if (pfkey_sk(sk)->registered) {
3090 is_alive = true;
3091 break;
3092 }
3093 }
3094 rcu_read_unlock();
3095
3096 return is_alive;
3097 }
3098
3099 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3100 {
3101 struct sk_buff *skb;
3102 struct sadb_msg *hdr;
3103 struct sadb_address *addr;
3104 struct sadb_x_policy *pol;
3105 int sockaddr_size;
3106 int size;
3107 struct sadb_x_sec_ctx *sec_ctx;
3108 struct xfrm_sec_ctx *xfrm_ctx;
3109 int ctx_size = 0;
3110
3111 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3112 if (!sockaddr_size)
3113 return -EINVAL;
3114
3115 size = sizeof(struct sadb_msg) +
3116 (sizeof(struct sadb_address) * 2) +
3117 (sockaddr_size * 2) +
3118 sizeof(struct sadb_x_policy);
3119
3120 if (x->id.proto == IPPROTO_AH)
3121 size += count_ah_combs(t);
3122 else if (x->id.proto == IPPROTO_ESP)
3123 size += count_esp_combs(t);
3124
3125 if ((xfrm_ctx = x->security)) {
3126 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3127 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3128 }
3129
3130 skb = alloc_skb(size + 16, GFP_ATOMIC);
3131 if (skb == NULL)
3132 return -ENOMEM;
3133
3134 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3135 hdr->sadb_msg_version = PF_KEY_V2;
3136 hdr->sadb_msg_type = SADB_ACQUIRE;
3137 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3138 hdr->sadb_msg_len = size / sizeof(uint64_t);
3139 hdr->sadb_msg_errno = 0;
3140 hdr->sadb_msg_reserved = 0;
3141 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3142 hdr->sadb_msg_pid = 0;
3143
3144 /* src address */
3145 addr = (struct sadb_address*) skb_put(skb,
3146 sizeof(struct sadb_address)+sockaddr_size);
3147 addr->sadb_address_len =
3148 (sizeof(struct sadb_address)+sockaddr_size)/
3149 sizeof(uint64_t);
3150 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3151 addr->sadb_address_proto = 0;
3152 addr->sadb_address_reserved = 0;
3153 addr->sadb_address_prefixlen =
3154 pfkey_sockaddr_fill(&x->props.saddr, 0,
3155 (struct sockaddr *) (addr + 1),
3156 x->props.family);
3157 if (!addr->sadb_address_prefixlen)
3158 BUG();
3159
3160 /* dst address */
3161 addr = (struct sadb_address*) skb_put(skb,
3162 sizeof(struct sadb_address)+sockaddr_size);
3163 addr->sadb_address_len =
3164 (sizeof(struct sadb_address)+sockaddr_size)/
3165 sizeof(uint64_t);
3166 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3167 addr->sadb_address_proto = 0;
3168 addr->sadb_address_reserved = 0;
3169 addr->sadb_address_prefixlen =
3170 pfkey_sockaddr_fill(&x->id.daddr, 0,
3171 (struct sockaddr *) (addr + 1),
3172 x->props.family);
3173 if (!addr->sadb_address_prefixlen)
3174 BUG();
3175
3176 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3177 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3178 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3179 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3180 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3181 pol->sadb_x_policy_reserved = 0;
3182 pol->sadb_x_policy_id = xp->index;
3183 pol->sadb_x_policy_priority = xp->priority;
3184
3185 /* Set sadb_comb's. */
3186 if (x->id.proto == IPPROTO_AH)
3187 dump_ah_combs(skb, t);
3188 else if (x->id.proto == IPPROTO_ESP)
3189 dump_esp_combs(skb, t);
3190
3191 /* security context */
3192 if (xfrm_ctx) {
3193 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3194 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3195 sec_ctx->sadb_x_sec_len =
3196 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3197 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3198 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3199 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3200 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3201 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3202 xfrm_ctx->ctx_len);
3203 }
3204
3205 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3206 }
3207
3208 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3209 u8 *data, int len, int *dir)
3210 {
3211 struct net *net = sock_net(sk);
3212 struct xfrm_policy *xp;
3213 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3214 struct sadb_x_sec_ctx *sec_ctx;
3215
3216 switch (sk->sk_family) {
3217 case AF_INET:
3218 if (opt != IP_IPSEC_POLICY) {
3219 *dir = -EOPNOTSUPP;
3220 return NULL;
3221 }
3222 break;
3223 #if IS_ENABLED(CONFIG_IPV6)
3224 case AF_INET6:
3225 if (opt != IPV6_IPSEC_POLICY) {
3226 *dir = -EOPNOTSUPP;
3227 return NULL;
3228 }
3229 break;
3230 #endif
3231 default:
3232 *dir = -EINVAL;
3233 return NULL;
3234 }
3235
3236 *dir = -EINVAL;
3237
3238 if (len < sizeof(struct sadb_x_policy) ||
3239 pol->sadb_x_policy_len*8 > len ||
3240 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3241 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3242 return NULL;
3243
3244 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3245 if (xp == NULL) {
3246 *dir = -ENOBUFS;
3247 return NULL;
3248 }
3249
3250 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3251 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3252
3253 xp->lft.soft_byte_limit = XFRM_INF;
3254 xp->lft.hard_byte_limit = XFRM_INF;
3255 xp->lft.soft_packet_limit = XFRM_INF;
3256 xp->lft.hard_packet_limit = XFRM_INF;
3257 xp->family = sk->sk_family;
3258
3259 xp->xfrm_nr = 0;
3260 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3261 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3262 goto out;
3263
3264 /* security context too */
3265 if (len >= (pol->sadb_x_policy_len*8 +
3266 sizeof(struct sadb_x_sec_ctx))) {
3267 char *p = (char *)pol;
3268 struct xfrm_user_sec_ctx *uctx;
3269
3270 p += pol->sadb_x_policy_len*8;
3271 sec_ctx = (struct sadb_x_sec_ctx *)p;
3272 if (len < pol->sadb_x_policy_len*8 +
3273 sec_ctx->sadb_x_sec_len) {
3274 *dir = -EINVAL;
3275 goto out;
3276 }
3277 if ((*dir = verify_sec_ctx_len(p)))
3278 goto out;
3279 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3280 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3281 kfree(uctx);
3282
3283 if (*dir)
3284 goto out;
3285 }
3286
3287 *dir = pol->sadb_x_policy_dir-1;
3288 return xp;
3289
3290 out:
3291 xp->walk.dead = 1;
3292 xfrm_policy_destroy(xp);
3293 return NULL;
3294 }
3295
3296 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3297 {
3298 struct sk_buff *skb;
3299 struct sadb_msg *hdr;
3300 struct sadb_sa *sa;
3301 struct sadb_address *addr;
3302 struct sadb_x_nat_t_port *n_port;
3303 int sockaddr_size;
3304 int size;
3305 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3306 struct xfrm_encap_tmpl *natt = NULL;
3307
3308 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3309 if (!sockaddr_size)
3310 return -EINVAL;
3311
3312 if (!satype)
3313 return -EINVAL;
3314
3315 if (!x->encap)
3316 return -EINVAL;
3317
3318 natt = x->encap;
3319
3320 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3321 *
3322 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3323 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3324 */
3325
3326 size = sizeof(struct sadb_msg) +
3327 sizeof(struct sadb_sa) +
3328 (sizeof(struct sadb_address) * 2) +
3329 (sockaddr_size * 2) +
3330 (sizeof(struct sadb_x_nat_t_port) * 2);
3331
3332 skb = alloc_skb(size + 16, GFP_ATOMIC);
3333 if (skb == NULL)
3334 return -ENOMEM;
3335
3336 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3337 hdr->sadb_msg_version = PF_KEY_V2;
3338 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3339 hdr->sadb_msg_satype = satype;
3340 hdr->sadb_msg_len = size / sizeof(uint64_t);
3341 hdr->sadb_msg_errno = 0;
3342 hdr->sadb_msg_reserved = 0;
3343 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3344 hdr->sadb_msg_pid = 0;
3345
3346 /* SA */
3347 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3348 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3349 sa->sadb_sa_exttype = SADB_EXT_SA;
3350 sa->sadb_sa_spi = x->id.spi;
3351 sa->sadb_sa_replay = 0;
3352 sa->sadb_sa_state = 0;
3353 sa->sadb_sa_auth = 0;
3354 sa->sadb_sa_encrypt = 0;
3355 sa->sadb_sa_flags = 0;
3356
3357 /* ADDRESS_SRC (old addr) */
3358 addr = (struct sadb_address*)
3359 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3360 addr->sadb_address_len =
3361 (sizeof(struct sadb_address)+sockaddr_size)/
3362 sizeof(uint64_t);
3363 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3364 addr->sadb_address_proto = 0;
3365 addr->sadb_address_reserved = 0;
3366 addr->sadb_address_prefixlen =
3367 pfkey_sockaddr_fill(&x->props.saddr, 0,
3368 (struct sockaddr *) (addr + 1),
3369 x->props.family);
3370 if (!addr->sadb_address_prefixlen)
3371 BUG();
3372
3373 /* NAT_T_SPORT (old port) */
3374 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3375 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3376 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3377 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3378 n_port->sadb_x_nat_t_port_reserved = 0;
3379
3380 /* ADDRESS_DST (new addr) */
3381 addr = (struct sadb_address*)
3382 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3383 addr->sadb_address_len =
3384 (sizeof(struct sadb_address)+sockaddr_size)/
3385 sizeof(uint64_t);
3386 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3387 addr->sadb_address_proto = 0;
3388 addr->sadb_address_reserved = 0;
3389 addr->sadb_address_prefixlen =
3390 pfkey_sockaddr_fill(ipaddr, 0,
3391 (struct sockaddr *) (addr + 1),
3392 x->props.family);
3393 if (!addr->sadb_address_prefixlen)
3394 BUG();
3395
3396 /* NAT_T_DPORT (new port) */
3397 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3398 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3399 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3400 n_port->sadb_x_nat_t_port_port = sport;
3401 n_port->sadb_x_nat_t_port_reserved = 0;
3402
3403 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3404 }
3405
3406 #ifdef CONFIG_NET_KEY_MIGRATE
3407 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3408 const struct xfrm_selector *sel)
3409 {
3410 struct sadb_address *addr;
3411 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3412 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3413 addr->sadb_address_exttype = type;
3414 addr->sadb_address_proto = sel->proto;
3415 addr->sadb_address_reserved = 0;
3416
3417 switch (type) {
3418 case SADB_EXT_ADDRESS_SRC:
3419 addr->sadb_address_prefixlen = sel->prefixlen_s;
3420 pfkey_sockaddr_fill(&sel->saddr, 0,
3421 (struct sockaddr *)(addr + 1),
3422 sel->family);
3423 break;
3424 case SADB_EXT_ADDRESS_DST:
3425 addr->sadb_address_prefixlen = sel->prefixlen_d;
3426 pfkey_sockaddr_fill(&sel->daddr, 0,
3427 (struct sockaddr *)(addr + 1),
3428 sel->family);
3429 break;
3430 default:
3431 return -EINVAL;
3432 }
3433
3434 return 0;
3435 }
3436
3437
3438 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3439 {
3440 struct sadb_x_kmaddress *kma;
3441 u8 *sa;
3442 int family = k->family;
3443 int socklen = pfkey_sockaddr_len(family);
3444 int size_req;
3445
3446 size_req = (sizeof(struct sadb_x_kmaddress) +
3447 pfkey_sockaddr_pair_size(family));
3448
3449 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3450 memset(kma, 0, size_req);
3451 kma->sadb_x_kmaddress_len = size_req / 8;
3452 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3453 kma->sadb_x_kmaddress_reserved = k->reserved;
3454
3455 sa = (u8 *)(kma + 1);
3456 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3457 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3458 return -EINVAL;
3459
3460 return 0;
3461 }
3462
3463 static int set_ipsecrequest(struct sk_buff *skb,
3464 uint8_t proto, uint8_t mode, int level,
3465 uint32_t reqid, uint8_t family,
3466 const xfrm_address_t *src, const xfrm_address_t *dst)
3467 {
3468 struct sadb_x_ipsecrequest *rq;
3469 u8 *sa;
3470 int socklen = pfkey_sockaddr_len(family);
3471 int size_req;
3472
3473 size_req = sizeof(struct sadb_x_ipsecrequest) +
3474 pfkey_sockaddr_pair_size(family);
3475
3476 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3477 memset(rq, 0, size_req);
3478 rq->sadb_x_ipsecrequest_len = size_req;
3479 rq->sadb_x_ipsecrequest_proto = proto;
3480 rq->sadb_x_ipsecrequest_mode = mode;
3481 rq->sadb_x_ipsecrequest_level = level;
3482 rq->sadb_x_ipsecrequest_reqid = reqid;
3483
3484 sa = (u8 *) (rq + 1);
3485 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3486 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3487 return -EINVAL;
3488
3489 return 0;
3490 }
3491 #endif
3492
3493 #ifdef CONFIG_NET_KEY_MIGRATE
3494 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3495 const struct xfrm_migrate *m, int num_bundles,
3496 const struct xfrm_kmaddress *k)
3497 {
3498 int i;
3499 int sasize_sel;
3500 int size = 0;
3501 int size_pol = 0;
3502 struct sk_buff *skb;
3503 struct sadb_msg *hdr;
3504 struct sadb_x_policy *pol;
3505 const struct xfrm_migrate *mp;
3506
3507 if (type != XFRM_POLICY_TYPE_MAIN)
3508 return 0;
3509
3510 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3511 return -EINVAL;
3512
3513 if (k != NULL) {
3514 /* addresses for KM */
3515 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3516 pfkey_sockaddr_pair_size(k->family));
3517 }
3518
3519 /* selector */
3520 sasize_sel = pfkey_sockaddr_size(sel->family);
3521 if (!sasize_sel)
3522 return -EINVAL;
3523 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3524
3525 /* policy info */
3526 size_pol += sizeof(struct sadb_x_policy);
3527
3528 /* ipsecrequests */
3529 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3530 /* old locator pair */
3531 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3532 pfkey_sockaddr_pair_size(mp->old_family);
3533 /* new locator pair */
3534 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3535 pfkey_sockaddr_pair_size(mp->new_family);
3536 }
3537
3538 size += sizeof(struct sadb_msg) + size_pol;
3539
3540 /* alloc buffer */
3541 skb = alloc_skb(size, GFP_ATOMIC);
3542 if (skb == NULL)
3543 return -ENOMEM;
3544
3545 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3546 hdr->sadb_msg_version = PF_KEY_V2;
3547 hdr->sadb_msg_type = SADB_X_MIGRATE;
3548 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3549 hdr->sadb_msg_len = size / 8;
3550 hdr->sadb_msg_errno = 0;
3551 hdr->sadb_msg_reserved = 0;
3552 hdr->sadb_msg_seq = 0;
3553 hdr->sadb_msg_pid = 0;
3554
3555 /* Addresses to be used by KM for negotiation, if ext is available */
3556 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3557 goto err;
3558
3559 /* selector src */
3560 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3561
3562 /* selector dst */
3563 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3564
3565 /* policy information */
3566 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3567 pol->sadb_x_policy_len = size_pol / 8;
3568 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3569 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3570 pol->sadb_x_policy_dir = dir + 1;
3571 pol->sadb_x_policy_reserved = 0;
3572 pol->sadb_x_policy_id = 0;
3573 pol->sadb_x_policy_priority = 0;
3574
3575 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3576 /* old ipsecrequest */
3577 int mode = pfkey_mode_from_xfrm(mp->mode);
3578 if (mode < 0)
3579 goto err;
3580 if (set_ipsecrequest(skb, mp->proto, mode,
3581 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3582 mp->reqid, mp->old_family,
3583 &mp->old_saddr, &mp->old_daddr) < 0)
3584 goto err;
3585
3586 /* new ipsecrequest */
3587 if (set_ipsecrequest(skb, mp->proto, mode,
3588 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3589 mp->reqid, mp->new_family,
3590 &mp->new_saddr, &mp->new_daddr) < 0)
3591 goto err;
3592 }
3593
3594 /* broadcast migrate message to sockets */
3595 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3596
3597 return 0;
3598
3599 err:
3600 kfree_skb(skb);
3601 return -EINVAL;
3602 }
3603 #else
3604 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3605 const struct xfrm_migrate *m, int num_bundles,
3606 const struct xfrm_kmaddress *k)
3607 {
3608 return -ENOPROTOOPT;
3609 }
3610 #endif
3611
3612 static int pfkey_sendmsg(struct kiocb *kiocb,
3613 struct socket *sock, struct msghdr *msg, size_t len)
3614 {
3615 struct sock *sk = sock->sk;
3616 struct sk_buff *skb = NULL;
3617 struct sadb_msg *hdr = NULL;
3618 int err;
3619 struct net *net = sock_net(sk);
3620
3621 err = -EOPNOTSUPP;
3622 if (msg->msg_flags & MSG_OOB)
3623 goto out;
3624
3625 err = -EMSGSIZE;
3626 if ((unsigned int)len > sk->sk_sndbuf - 32)
3627 goto out;
3628
3629 err = -ENOBUFS;
3630 skb = alloc_skb(len, GFP_KERNEL);
3631 if (skb == NULL)
3632 goto out;
3633
3634 err = -EFAULT;
3635 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3636 goto out;
3637
3638 hdr = pfkey_get_base_msg(skb, &err);
3639 if (!hdr)
3640 goto out;
3641
3642 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3643 err = pfkey_process(sk, skb, hdr);
3644 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3645
3646 out:
3647 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3648 err = 0;
3649 kfree_skb(skb);
3650
3651 return err ? : len;
3652 }
3653
3654 static int pfkey_recvmsg(struct kiocb *kiocb,
3655 struct socket *sock, struct msghdr *msg, size_t len,
3656 int flags)
3657 {
3658 struct sock *sk = sock->sk;
3659 struct pfkey_sock *pfk = pfkey_sk(sk);
3660 struct sk_buff *skb;
3661 int copied, err;
3662
3663 err = -EINVAL;
3664 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3665 goto out;
3666
3667 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3668 if (skb == NULL)
3669 goto out;
3670
3671 copied = skb->len;
3672 if (copied > len) {
3673 msg->msg_flags |= MSG_TRUNC;
3674 copied = len;
3675 }
3676
3677 skb_reset_transport_header(skb);
3678 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3679 if (err)
3680 goto out_free;
3681
3682 sock_recv_ts_and_drops(msg, sk, skb);
3683
3684 err = (flags & MSG_TRUNC) ? skb->len : copied;
3685
3686 if (pfk->dump.dump != NULL &&
3687 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3688 pfkey_do_dump(pfk);
3689
3690 out_free:
3691 skb_free_datagram(sk, skb);
3692 out:
3693 return err;
3694 }
3695
3696 static const struct proto_ops pfkey_ops = {
3697 .family = PF_KEY,
3698 .owner = THIS_MODULE,
3699 /* Operations that make no sense on pfkey sockets. */
3700 .bind = sock_no_bind,
3701 .connect = sock_no_connect,
3702 .socketpair = sock_no_socketpair,
3703 .accept = sock_no_accept,
3704 .getname = sock_no_getname,
3705 .ioctl = sock_no_ioctl,
3706 .listen = sock_no_listen,
3707 .shutdown = sock_no_shutdown,
3708 .setsockopt = sock_no_setsockopt,
3709 .getsockopt = sock_no_getsockopt,
3710 .mmap = sock_no_mmap,
3711 .sendpage = sock_no_sendpage,
3712
3713 /* Now the operations that really occur. */
3714 .release = pfkey_release,
3715 .poll = datagram_poll,
3716 .sendmsg = pfkey_sendmsg,
3717 .recvmsg = pfkey_recvmsg,
3718 };
3719
3720 static const struct net_proto_family pfkey_family_ops = {
3721 .family = PF_KEY,
3722 .create = pfkey_create,
3723 .owner = THIS_MODULE,
3724 };
3725
3726 #ifdef CONFIG_PROC_FS
3727 static int pfkey_seq_show(struct seq_file *f, void *v)
3728 {
3729 struct sock *s = sk_entry(v);
3730
3731 if (v == SEQ_START_TOKEN)
3732 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3733 else
3734 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3735 s,
3736 atomic_read(&s->sk_refcnt),
3737 sk_rmem_alloc_get(s),
3738 sk_wmem_alloc_get(s),
3739 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3740 sock_i_ino(s)
3741 );
3742 return 0;
3743 }
3744
3745 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3746 __acquires(rcu)
3747 {
3748 struct net *net = seq_file_net(f);
3749 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3750
3751 rcu_read_lock();
3752 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3753 }
3754
3755 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3756 {
3757 struct net *net = seq_file_net(f);
3758 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3759
3760 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3761 }
3762
3763 static void pfkey_seq_stop(struct seq_file *f, void *v)
3764 __releases(rcu)
3765 {
3766 rcu_read_unlock();
3767 }
3768
3769 static const struct seq_operations pfkey_seq_ops = {
3770 .start = pfkey_seq_start,
3771 .next = pfkey_seq_next,
3772 .stop = pfkey_seq_stop,
3773 .show = pfkey_seq_show,
3774 };
3775
3776 static int pfkey_seq_open(struct inode *inode, struct file *file)
3777 {
3778 return seq_open_net(inode, file, &pfkey_seq_ops,
3779 sizeof(struct seq_net_private));
3780 }
3781
3782 static const struct file_operations pfkey_proc_ops = {
3783 .open = pfkey_seq_open,
3784 .read = seq_read,
3785 .llseek = seq_lseek,
3786 .release = seq_release_net,
3787 };
3788
3789 static int __net_init pfkey_init_proc(struct net *net)
3790 {
3791 struct proc_dir_entry *e;
3792
3793 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3794 if (e == NULL)
3795 return -ENOMEM;
3796
3797 return 0;
3798 }
3799
3800 static void __net_exit pfkey_exit_proc(struct net *net)
3801 {
3802 remove_proc_entry("pfkey", net->proc_net);
3803 }
3804 #else
3805 static inline int pfkey_init_proc(struct net *net)
3806 {
3807 return 0;
3808 }
3809
3810 static inline void pfkey_exit_proc(struct net *net)
3811 {
3812 }
3813 #endif
3814
3815 static struct xfrm_mgr pfkeyv2_mgr =
3816 {
3817 .id = "pfkeyv2",
3818 .notify = pfkey_send_notify,
3819 .acquire = pfkey_send_acquire,
3820 .compile_policy = pfkey_compile_policy,
3821 .new_mapping = pfkey_send_new_mapping,
3822 .notify_policy = pfkey_send_policy_notify,
3823 .migrate = pfkey_send_migrate,
3824 .is_alive = pfkey_is_alive,
3825 };
3826
3827 static int __net_init pfkey_net_init(struct net *net)
3828 {
3829 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3830 int rv;
3831
3832 INIT_HLIST_HEAD(&net_pfkey->table);
3833 atomic_set(&net_pfkey->socks_nr, 0);
3834
3835 rv = pfkey_init_proc(net);
3836
3837 return rv;
3838 }
3839
3840 static void __net_exit pfkey_net_exit(struct net *net)
3841 {
3842 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3843
3844 pfkey_exit_proc(net);
3845 BUG_ON(!hlist_empty(&net_pfkey->table));
3846 }
3847
3848 static struct pernet_operations pfkey_net_ops = {
3849 .init = pfkey_net_init,
3850 .exit = pfkey_net_exit,
3851 .id = &pfkey_net_id,
3852 .size = sizeof(struct netns_pfkey),
3853 };
3854
3855 static void __exit ipsec_pfkey_exit(void)
3856 {
3857 xfrm_unregister_km(&pfkeyv2_mgr);
3858 sock_unregister(PF_KEY);
3859 unregister_pernet_subsys(&pfkey_net_ops);
3860 proto_unregister(&key_proto);
3861 }
3862
3863 static int __init ipsec_pfkey_init(void)
3864 {
3865 int err = proto_register(&key_proto, 0);
3866
3867 if (err != 0)
3868 goto out;
3869
3870 err = register_pernet_subsys(&pfkey_net_ops);
3871 if (err != 0)
3872 goto out_unregister_key_proto;
3873 err = sock_register(&pfkey_family_ops);
3874 if (err != 0)
3875 goto out_unregister_pernet;
3876 err = xfrm_register_km(&pfkeyv2_mgr);
3877 if (err != 0)
3878 goto out_sock_unregister;
3879 out:
3880 return err;
3881
3882 out_sock_unregister:
3883 sock_unregister(PF_KEY);
3884 out_unregister_pernet:
3885 unregister_pernet_subsys(&pfkey_net_ops);
3886 out_unregister_key_proto:
3887 proto_unregister(&key_proto);
3888 goto out;
3889 }
3890
3891 module_init(ipsec_pfkey_init);
3892 module_exit(ipsec_pfkey_exit);
3893 MODULE_LICENSE("GPL");
3894 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux with added FPC-III support