1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
4 *
5 * Authors: Maxim Giryaev <gem@asplinux.ru>
6 * David S. Miller <davem@redhat.com>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
10 * Derek Atkins <derek@ihtfp.com>
11 */
12
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/socket.h>
17 #include <linux/pfkeyv2.h>
18 #include <linux/ipsec.h>
19 #include <linux/skbuff.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/in.h>
22 #include <linux/in6.h>
23 #include <linux/proc_fs.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <net/net_namespace.h>
27 #include <net/netns/generic.h>
28 #include <net/xfrm.h>
29
30 #include <net/sock.h>
31
32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
34
35 static unsigned int pfkey_net_id __read_mostly;
36 struct netns_pfkey {
37 /* List of all pfkey sockets. */
38 struct hlist_head table;
39 atomic_t socks_nr;
40 };
41 static DEFINE_MUTEX(pfkey_mutex);
42
43 #define DUMMY_MARK 0
44 static const struct xfrm_mark dummy_mark = {0, 0};
45 struct pfkey_sock {
46 /* struct sock must be the first member of struct pfkey_sock */
47 struct sock sk;
48 int registered;
49 int promisc;
50
51 struct {
52 uint8_t msg_version;
53 uint32_t msg_portid;
54 int (*dump)(struct pfkey_sock *sk);
55 void (*done)(struct pfkey_sock *sk);
56 union {
57 struct xfrm_policy_walk policy;
58 struct xfrm_state_walk state;
59 } u;
60 struct sk_buff *skb;
61 } dump;
62 struct mutex dump_lock;
63 };
64
65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
66 xfrm_address_t *saddr, xfrm_address_t *daddr,
67 u16 *family);
68
69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70 {
71 return (struct pfkey_sock *)sk;
72 }
73
74 static int pfkey_can_dump(const struct sock *sk)
75 {
76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
77 return 1;
78 return 0;
79 }
80
81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
82 {
83 if (pfk->dump.dump) {
84 if (pfk->dump.skb) {
85 kfree_skb(pfk->dump.skb);
86 pfk->dump.skb = NULL;
87 }
88 pfk->dump.done(pfk);
89 pfk->dump.dump = NULL;
90 pfk->dump.done = NULL;
91 }
92 }
93
94 static void pfkey_sock_destruct(struct sock *sk)
95 {
96 struct net *net = sock_net(sk);
97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
98
99 pfkey_terminate_dump(pfkey_sk(sk));
100 skb_queue_purge(&sk->sk_receive_queue);
101
102 if (!sock_flag(sk, SOCK_DEAD)) {
103 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
104 return;
105 }
106
107 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
108 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
109
110 atomic_dec(&net_pfkey->socks_nr);
111 }
112
113 static const struct proto_ops pfkey_ops;
114
115 static void pfkey_insert(struct sock *sk)
116 {
117 struct net *net = sock_net(sk);
118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
119
120 mutex_lock(&pfkey_mutex);
121 sk_add_node_rcu(sk, &net_pfkey->table);
122 mutex_unlock(&pfkey_mutex);
123 }
124
125 static void pfkey_remove(struct sock *sk)
126 {
127 mutex_lock(&pfkey_mutex);
128 sk_del_node_init_rcu(sk);
129 mutex_unlock(&pfkey_mutex);
130 }
131
132 static struct proto key_proto = {
133 .name = "KEY",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct pfkey_sock),
136 };
137
138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
139 int kern)
140 {
141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
142 struct sock *sk;
143 struct pfkey_sock *pfk;
144
145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
146 return -EPERM;
147 if (sock->type != SOCK_RAW)
148 return -ESOCKTNOSUPPORT;
149 if (protocol != PF_KEY_V2)
150 return -EPROTONOSUPPORT;
151
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
153 if (sk == NULL)
154 return -ENOMEM;
155
156 pfk = pfkey_sk(sk);
157 mutex_init(&pfk->dump_lock);
158
159 sock->ops = &pfkey_ops;
160 sock_init_data(sock, sk);
161
162 sk->sk_family = PF_KEY;
163 sk->sk_destruct = pfkey_sock_destruct;
164
165 atomic_inc(&net_pfkey->socks_nr);
166
167 pfkey_insert(sk);
168
169 return 0;
170 }
171
172 static int pfkey_release(struct socket *sock)
173 {
174 struct sock *sk = sock->sk;
175
176 if (!sk)
177 return 0;
178
179 pfkey_remove(sk);
180
181 sock_orphan(sk);
182 sock->sk = NULL;
183 skb_queue_purge(&sk->sk_write_queue);
184
185 synchronize_rcu();
186 sock_put(sk);
187
188 return 0;
189 }
190
191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
192 struct sock *sk)
193 {
194 int err = -ENOBUFS;
195
196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
197 return err;
198
199 skb = skb_clone(skb, allocation);
200
201 if (skb) {
202 skb_set_owner_r(skb, sk);
203 skb_queue_tail(&sk->sk_receive_queue, skb);
204 sk->sk_data_ready(sk);
205 err = 0;
206 }
207 return err;
208 }
209
210 /* Send SKB to all pfkey sockets matching selected criteria. */
211 #define BROADCAST_ALL 0
212 #define BROADCAST_ONE 1
213 #define BROADCAST_REGISTERED 2
214 #define BROADCAST_PROMISC_ONLY 4
215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
216 int broadcast_flags, struct sock *one_sk,
217 struct net *net)
218 {
219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
220 struct sock *sk;
221 int err = -ESRCH;
222
223 /* XXX Do we need something like netlink_overrun? I think
224 * XXX PF_KEY socket apps will not mind current behavior.
225 */
226 if (!skb)
227 return -ENOMEM;
228
229 rcu_read_lock();
230 sk_for_each_rcu(sk, &net_pfkey->table) {
231 struct pfkey_sock *pfk = pfkey_sk(sk);
232 int err2;
233
234 /* Yes, it means that if you are meant to receive this
235 * pfkey message you receive it twice as promiscuous
236 * socket.
237 */
238 if (pfk->promisc)
239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
240
241 /* the exact target will be processed later */
242 if (sk == one_sk)
243 continue;
244 if (broadcast_flags != BROADCAST_ALL) {
245 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
246 continue;
247 if ((broadcast_flags & BROADCAST_REGISTERED) &&
248 !pfk->registered)
249 continue;
250 if (broadcast_flags & BROADCAST_ONE)
251 continue;
252 }
253
254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
255
256 /* Error is cleared after successful sending to at least one
257 * registered KM */
258 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
259 err = err2;
260 }
261 rcu_read_unlock();
262
263 if (one_sk != NULL)
264 err = pfkey_broadcast_one(skb, allocation, one_sk);
265
266 kfree_skb(skb);
267 return err;
268 }
269
270 static int pfkey_do_dump(struct pfkey_sock *pfk)
271 {
272 struct sadb_msg *hdr;
273 int rc;
274
275 mutex_lock(&pfk->dump_lock);
276 if (!pfk->dump.dump) {
277 rc = 0;
278 goto out;
279 }
280
281 rc = pfk->dump.dump(pfk);
282 if (rc == -ENOBUFS) {
283 rc = 0;
284 goto out;
285 }
286
287 if (pfk->dump.skb) {
288 if (!pfkey_can_dump(&pfk->sk)) {
289 rc = 0;
290 goto out;
291 }
292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 &pfk->sk, sock_net(&pfk->sk));
298 pfk->dump.skb = NULL;
299 }
300
301 pfkey_terminate_dump(pfk);
302
303 out:
304 mutex_unlock(&pfk->dump_lock);
305 return rc;
306 }
307
308 static inline void pfkey_hdr_dup(struct sadb_msg *new,
309 const struct sadb_msg *orig)
310 {
311 *new = *orig;
312 }
313
314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
315 {
316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
317 struct sadb_msg *hdr;
318
319 if (!skb)
320 return -ENOBUFS;
321
322 /* Woe be to the platform trying to support PFKEY yet
323 * having normal errnos outside the 1-255 range, inclusive.
324 */
325 err = -err;
326 if (err == ERESTARTSYS ||
327 err == ERESTARTNOHAND ||
328 err == ERESTARTNOINTR)
329 err = EINTR;
330 if (err >= 512)
331 err = EINVAL;
332 BUG_ON(err <= 0 || err >= 256);
333
334 hdr = skb_put(skb, sizeof(struct sadb_msg));
335 pfkey_hdr_dup(hdr, orig);
336 hdr->sadb_msg_errno = (uint8_t) err;
337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
338 sizeof(uint64_t));
339
340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
341
342 return 0;
343 }
344
345 static const u8 sadb_ext_min_len[] = {
346 [SADB_EXT_RESERVED] = (u8) 0,
347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
373 };
374
375 /* Verify sadb_address_{len,prefixlen} against sa_family. */
376 static int verify_address_len(const void *p)
377 {
378 const struct sadb_address *sp = p;
379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
380 const struct sockaddr_in *sin;
381 #if IS_ENABLED(CONFIG_IPV6)
382 const struct sockaddr_in6 *sin6;
383 #endif
384 int len;
385
386 if (sp->sadb_address_len <
387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
388 sizeof(uint64_t)))
389 return -EINVAL;
390
391 switch (addr->sa_family) {
392 case AF_INET:
393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
394 if (sp->sadb_address_len != len ||
395 sp->sadb_address_prefixlen > 32)
396 return -EINVAL;
397 break;
398 #if IS_ENABLED(CONFIG_IPV6)
399 case AF_INET6:
400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
401 if (sp->sadb_address_len != len ||
402 sp->sadb_address_prefixlen > 128)
403 return -EINVAL;
404 break;
405 #endif
406 default:
407 /* It is user using kernel to keep track of security
408 * associations for another protocol, such as
409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
410 * lengths.
411 *
412 * XXX Actually, association/policy database is not yet
413 * XXX able to cope with arbitrary sockaddr families.
414 * XXX When it can, remove this -EINVAL. -DaveM
415 */
416 return -EINVAL;
417 }
418
419 return 0;
420 }
421
422 static inline int sadb_key_len(const struct sadb_key *key)
423 {
424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
425
426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
427 sizeof(uint64_t));
428 }
429
430 static int verify_key_len(const void *p)
431 {
432 const struct sadb_key *key = p;
433
434 if (sadb_key_len(key) > key->sadb_key_len)
435 return -EINVAL;
436
437 return 0;
438 }
439
440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
441 {
442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 sec_ctx->sadb_x_ctx_len,
444 sizeof(uint64_t));
445 }
446
447 static inline int verify_sec_ctx_len(const void *p)
448 {
449 const struct sadb_x_sec_ctx *sec_ctx = p;
450 int len = sec_ctx->sadb_x_ctx_len;
451
452 if (len > PAGE_SIZE)
453 return -EINVAL;
454
455 len = pfkey_sec_ctx_len(sec_ctx);
456
457 if (sec_ctx->sadb_x_sec_len != len)
458 return -EINVAL;
459
460 return 0;
461 }
462
463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 gfp_t gfp)
465 {
466 struct xfrm_user_sec_ctx *uctx = NULL;
467 int ctx_size = sec_ctx->sadb_x_ctx_len;
468
469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
470
471 if (!uctx)
472 return NULL;
473
474 uctx->len = pfkey_sec_ctx_len(sec_ctx);
475 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
479 memcpy(uctx + 1, sec_ctx + 1,
480 uctx->ctx_len);
481
482 return uctx;
483 }
484
485 static int present_and_same_family(const struct sadb_address *src,
486 const struct sadb_address *dst)
487 {
488 const struct sockaddr *s_addr, *d_addr;
489
490 if (!src || !dst)
491 return 0;
492
493 s_addr = (const struct sockaddr *)(src + 1);
494 d_addr = (const struct sockaddr *)(dst + 1);
495 if (s_addr->sa_family != d_addr->sa_family)
496 return 0;
497 if (s_addr->sa_family != AF_INET
498 #if IS_ENABLED(CONFIG_IPV6)
499 && s_addr->sa_family != AF_INET6
500 #endif
501 )
502 return 0;
503
504 return 1;
505 }
506
507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
508 {
509 const char *p = (char *) hdr;
510 int len = skb->len;
511
512 len -= sizeof(*hdr);
513 p += sizeof(*hdr);
514 while (len > 0) {
515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
516 uint16_t ext_type;
517 int ext_len;
518
519 if (len < sizeof(*ehdr))
520 return -EINVAL;
521
522 ext_len = ehdr->sadb_ext_len;
523 ext_len *= sizeof(uint64_t);
524 ext_type = ehdr->sadb_ext_type;
525 if (ext_len < sizeof(uint64_t) ||
526 ext_len > len ||
527 ext_type == SADB_EXT_RESERVED)
528 return -EINVAL;
529
530 if (ext_type <= SADB_EXT_MAX) {
531 int min = (int) sadb_ext_min_len[ext_type];
532 if (ext_len < min)
533 return -EINVAL;
534 if (ext_hdrs[ext_type-1] != NULL)
535 return -EINVAL;
536 switch (ext_type) {
537 case SADB_EXT_ADDRESS_SRC:
538 case SADB_EXT_ADDRESS_DST:
539 case SADB_EXT_ADDRESS_PROXY:
540 case SADB_X_EXT_NAT_T_OA:
541 if (verify_address_len(p))
542 return -EINVAL;
543 break;
544 case SADB_X_EXT_SEC_CTX:
545 if (verify_sec_ctx_len(p))
546 return -EINVAL;
547 break;
548 case SADB_EXT_KEY_AUTH:
549 case SADB_EXT_KEY_ENCRYPT:
550 if (verify_key_len(p))
551 return -EINVAL;
552 break;
553 default:
554 break;
555 }
556 ext_hdrs[ext_type-1] = (void *) p;
557 }
558 p += ext_len;
559 len -= ext_len;
560 }
561
562 return 0;
563 }
564
565 static uint16_t
566 pfkey_satype2proto(uint8_t satype)
567 {
568 switch (satype) {
569 case SADB_SATYPE_UNSPEC:
570 return IPSEC_PROTO_ANY;
571 case SADB_SATYPE_AH:
572 return IPPROTO_AH;
573 case SADB_SATYPE_ESP:
574 return IPPROTO_ESP;
575 case SADB_X_SATYPE_IPCOMP:
576 return IPPROTO_COMP;
577 default:
578 return 0;
579 }
580 /* NOTREACHED */
581 }
582
583 static uint8_t
584 pfkey_proto2satype(uint16_t proto)
585 {
586 switch (proto) {
587 case IPPROTO_AH:
588 return SADB_SATYPE_AH;
589 case IPPROTO_ESP:
590 return SADB_SATYPE_ESP;
591 case IPPROTO_COMP:
592 return SADB_X_SATYPE_IPCOMP;
593 default:
594 return 0;
595 }
596 /* NOTREACHED */
597 }
598
599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
600 * say specifically 'just raw sockets' as we encode them as 255.
601 */
602
603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
604 {
605 return proto == IPSEC_PROTO_ANY ? 0 : proto;
606 }
607
608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
609 {
610 return proto ? proto : IPSEC_PROTO_ANY;
611 }
612
613 static inline int pfkey_sockaddr_len(sa_family_t family)
614 {
615 switch (family) {
616 case AF_INET:
617 return sizeof(struct sockaddr_in);
618 #if IS_ENABLED(CONFIG_IPV6)
619 case AF_INET6:
620 return sizeof(struct sockaddr_in6);
621 #endif
622 }
623 return 0;
624 }
625
626 static
627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
628 {
629 switch (sa->sa_family) {
630 case AF_INET:
631 xaddr->a4 =
632 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
633 return AF_INET;
634 #if IS_ENABLED(CONFIG_IPV6)
635 case AF_INET6:
636 memcpy(xaddr->a6,
637 &((struct sockaddr_in6 *)sa)->sin6_addr,
638 sizeof(struct in6_addr));
639 return AF_INET6;
640 #endif
641 }
642 return 0;
643 }
644
645 static
646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
647 {
648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
649 xaddr);
650 }
651
652 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
653 {
654 const struct sadb_sa *sa;
655 const struct sadb_address *addr;
656 uint16_t proto;
657 unsigned short family;
658 xfrm_address_t *xaddr;
659
660 sa = ext_hdrs[SADB_EXT_SA - 1];
661 if (sa == NULL)
662 return NULL;
663
664 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
665 if (proto == 0)
666 return NULL;
667
668 /* sadb_address_len should be checked by caller */
669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
670 if (addr == NULL)
671 return NULL;
672
673 family = ((const struct sockaddr *)(addr + 1))->sa_family;
674 switch (family) {
675 case AF_INET:
676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
677 break;
678 #if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
681 break;
682 #endif
683 default:
684 xaddr = NULL;
685 }
686
687 if (!xaddr)
688 return NULL;
689
690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
691 }
692
693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
694
695 static int
696 pfkey_sockaddr_size(sa_family_t family)
697 {
698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
699 }
700
701 static inline int pfkey_mode_from_xfrm(int mode)
702 {
703 switch(mode) {
704 case XFRM_MODE_TRANSPORT:
705 return IPSEC_MODE_TRANSPORT;
706 case XFRM_MODE_TUNNEL:
707 return IPSEC_MODE_TUNNEL;
708 case XFRM_MODE_BEET:
709 return IPSEC_MODE_BEET;
710 default:
711 return -1;
712 }
713 }
714
715 static inline int pfkey_mode_to_xfrm(int mode)
716 {
717 switch(mode) {
718 case IPSEC_MODE_ANY: /*XXX*/
719 case IPSEC_MODE_TRANSPORT:
720 return XFRM_MODE_TRANSPORT;
721 case IPSEC_MODE_TUNNEL:
722 return XFRM_MODE_TUNNEL;
723 case IPSEC_MODE_BEET:
724 return XFRM_MODE_BEET;
725 default:
726 return -1;
727 }
728 }
729
730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
731 struct sockaddr *sa,
732 unsigned short family)
733 {
734 switch (family) {
735 case AF_INET:
736 {
737 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
738 sin->sin_family = AF_INET;
739 sin->sin_port = port;
740 sin->sin_addr.s_addr = xaddr->a4;
741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
742 return 32;
743 }
744 #if IS_ENABLED(CONFIG_IPV6)
745 case AF_INET6:
746 {
747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
748 sin6->sin6_family = AF_INET6;
749 sin6->sin6_port = port;
750 sin6->sin6_flowinfo = 0;
751 sin6->sin6_addr = xaddr->in6;
752 sin6->sin6_scope_id = 0;
753 return 128;
754 }
755 #endif
756 }
757 return 0;
758 }
759
760 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
761 int add_keys, int hsc)
762 {
763 struct sk_buff *skb;
764 struct sadb_msg *hdr;
765 struct sadb_sa *sa;
766 struct sadb_lifetime *lifetime;
767 struct sadb_address *addr;
768 struct sadb_key *key;
769 struct sadb_x_sa2 *sa2;
770 struct sadb_x_sec_ctx *sec_ctx;
771 struct xfrm_sec_ctx *xfrm_ctx;
772 int ctx_size = 0;
773 int size;
774 int auth_key_size = 0;
775 int encrypt_key_size = 0;
776 int sockaddr_size;
777 struct xfrm_encap_tmpl *natt = NULL;
778 int mode;
779
780 /* address family check */
781 sockaddr_size = pfkey_sockaddr_size(x->props.family);
782 if (!sockaddr_size)
783 return ERR_PTR(-EINVAL);
784
785 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
786 key(AE), (identity(SD),) (sensitivity)> */
787 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
788 sizeof(struct sadb_lifetime) +
789 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
790 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
791 sizeof(struct sadb_address)*2 +
792 sockaddr_size*2 +
793 sizeof(struct sadb_x_sa2);
794
795 if ((xfrm_ctx = x->security)) {
796 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
797 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
798 }
799
800 /* identity & sensitivity */
801 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
802 size += sizeof(struct sadb_address) + sockaddr_size;
803
804 if (add_keys) {
805 if (x->aalg && x->aalg->alg_key_len) {
806 auth_key_size =
807 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
808 size += sizeof(struct sadb_key) + auth_key_size;
809 }
810 if (x->ealg && x->ealg->alg_key_len) {
811 encrypt_key_size =
812 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
813 size += sizeof(struct sadb_key) + encrypt_key_size;
814 }
815 }
816 if (x->encap)
817 natt = x->encap;
818
819 if (natt && natt->encap_type) {
820 size += sizeof(struct sadb_x_nat_t_type);
821 size += sizeof(struct sadb_x_nat_t_port);
822 size += sizeof(struct sadb_x_nat_t_port);
823 }
824
825 skb = alloc_skb(size + 16, GFP_ATOMIC);
826 if (skb == NULL)
827 return ERR_PTR(-ENOBUFS);
828
829 /* call should fill header later */
830 hdr = skb_put(skb, sizeof(struct sadb_msg));
831 memset(hdr, 0, size); /* XXX do we need this ? */
832 hdr->sadb_msg_len = size / sizeof(uint64_t);
833
834 /* sa */
835 sa = skb_put(skb, sizeof(struct sadb_sa));
836 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
837 sa->sadb_sa_exttype = SADB_EXT_SA;
838 sa->sadb_sa_spi = x->id.spi;
839 sa->sadb_sa_replay = x->props.replay_window;
840 switch (x->km.state) {
841 case XFRM_STATE_VALID:
842 sa->sadb_sa_state = x->km.dying ?
843 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
844 break;
845 case XFRM_STATE_ACQ:
846 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
847 break;
848 default:
849 sa->sadb_sa_state = SADB_SASTATE_DEAD;
850 break;
851 }
852 sa->sadb_sa_auth = 0;
853 if (x->aalg) {
854 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
855 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
856 a->desc.sadb_alg_id : 0;
857 }
858 sa->sadb_sa_encrypt = 0;
859 BUG_ON(x->ealg && x->calg);
860 if (x->ealg) {
861 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
862 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
863 a->desc.sadb_alg_id : 0;
864 }
865 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
866 if (x->calg) {
867 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
868 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
869 a->desc.sadb_alg_id : 0;
870 }
871
872 sa->sadb_sa_flags = 0;
873 if (x->props.flags & XFRM_STATE_NOECN)
874 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
875 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
876 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
877 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
879
880 /* hard time */
881 if (hsc & 2) {
882 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
883 lifetime->sadb_lifetime_len =
884 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
885 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
886 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
887 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
888 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
889 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
890 }
891 /* soft time */
892 if (hsc & 1) {
893 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
894 lifetime->sadb_lifetime_len =
895 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
896 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
897 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
898 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
899 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
900 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
901 }
902 /* current time */
903 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
904 lifetime->sadb_lifetime_len =
905 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
906 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
907 lifetime->sadb_lifetime_allocations = x->curlft.packets;
908 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
909 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
910 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
911 /* src address */
912 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
913 addr->sadb_address_len =
914 (sizeof(struct sadb_address)+sockaddr_size)/
915 sizeof(uint64_t);
916 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
917 /* "if the ports are non-zero, then the sadb_address_proto field,
918 normally zero, MUST be filled in with the transport
919 protocol's number." - RFC2367 */
920 addr->sadb_address_proto = 0;
921 addr->sadb_address_reserved = 0;
922
923 addr->sadb_address_prefixlen =
924 pfkey_sockaddr_fill(&x->props.saddr, 0,
925 (struct sockaddr *) (addr + 1),
926 x->props.family);
927 BUG_ON(!addr->sadb_address_prefixlen);
928
929 /* dst address */
930 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
931 addr->sadb_address_len =
932 (sizeof(struct sadb_address)+sockaddr_size)/
933 sizeof(uint64_t);
934 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
935 addr->sadb_address_proto = 0;
936 addr->sadb_address_reserved = 0;
937
938 addr->sadb_address_prefixlen =
939 pfkey_sockaddr_fill(&x->id.daddr, 0,
940 (struct sockaddr *) (addr + 1),
941 x->props.family);
942 BUG_ON(!addr->sadb_address_prefixlen);
943
944 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
945 x->props.family)) {
946 addr = skb_put(skb,
947 sizeof(struct sadb_address) + sockaddr_size);
948 addr->sadb_address_len =
949 (sizeof(struct sadb_address)+sockaddr_size)/
950 sizeof(uint64_t);
951 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
952 addr->sadb_address_proto =
953 pfkey_proto_from_xfrm(x->sel.proto);
954 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
955 addr->sadb_address_reserved = 0;
956
957 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
958 (struct sockaddr *) (addr + 1),
959 x->props.family);
960 }
961
962 /* auth key */
963 if (add_keys && auth_key_size) {
964 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
965 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
966 sizeof(uint64_t);
967 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
968 key->sadb_key_bits = x->aalg->alg_key_len;
969 key->sadb_key_reserved = 0;
970 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
971 }
972 /* encrypt key */
973 if (add_keys && encrypt_key_size) {
974 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
975 key->sadb_key_len = (sizeof(struct sadb_key) +
976 encrypt_key_size) / sizeof(uint64_t);
977 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
978 key->sadb_key_bits = x->ealg->alg_key_len;
979 key->sadb_key_reserved = 0;
980 memcpy(key + 1, x->ealg->alg_key,
981 (x->ealg->alg_key_len+7)/8);
982 }
983
984 /* sa */
985 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
986 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
987 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
988 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
989 kfree_skb(skb);
990 return ERR_PTR(-EINVAL);
991 }
992 sa2->sadb_x_sa2_mode = mode;
993 sa2->sadb_x_sa2_reserved1 = 0;
994 sa2->sadb_x_sa2_reserved2 = 0;
995 sa2->sadb_x_sa2_sequence = 0;
996 sa2->sadb_x_sa2_reqid = x->props.reqid;
997
998 if (natt && natt->encap_type) {
999 struct sadb_x_nat_t_type *n_type;
1000 struct sadb_x_nat_t_port *n_port;
1001
1002 /* type */
1003 n_type = skb_put(skb, sizeof(*n_type));
1004 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1005 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1006 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1007 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1008 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1009 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1010
1011 /* source port */
1012 n_port = skb_put(skb, sizeof(*n_port));
1013 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1014 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1015 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1016 n_port->sadb_x_nat_t_port_reserved = 0;
1017
1018 /* dest port */
1019 n_port = skb_put(skb, sizeof(*n_port));
1020 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1021 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1022 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1023 n_port->sadb_x_nat_t_port_reserved = 0;
1024 }
1025
1026 /* security context */
1027 if (xfrm_ctx) {
1028 sec_ctx = skb_put(skb,
1029 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1030 sec_ctx->sadb_x_sec_len =
1031 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1032 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1033 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1034 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1035 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1036 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1037 xfrm_ctx->ctx_len);
1038 }
1039
1040 return skb;
1041 }
1042
1043
1044 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1045 {
1046 struct sk_buff *skb;
1047
1048 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1049
1050 return skb;
1051 }
1052
1053 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1054 int hsc)
1055 {
1056 return __pfkey_xfrm_state2msg(x, 0, hsc);
1057 }
1058
1059 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1060 const struct sadb_msg *hdr,
1061 void * const *ext_hdrs)
1062 {
1063 struct xfrm_state *x;
1064 const struct sadb_lifetime *lifetime;
1065 const struct sadb_sa *sa;
1066 const struct sadb_key *key;
1067 const struct sadb_x_sec_ctx *sec_ctx;
1068 uint16_t proto;
1069 int err;
1070
1071
1072 sa = ext_hdrs[SADB_EXT_SA - 1];
1073 if (!sa ||
1074 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076 return ERR_PTR(-EINVAL);
1077 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079 return ERR_PTR(-EINVAL);
1080 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082 return ERR_PTR(-EINVAL);
1083 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085 return ERR_PTR(-EINVAL);
1086
1087 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088 if (proto == 0)
1089 return ERR_PTR(-EINVAL);
1090
1091 /* default error is no buffer space */
1092 err = -ENOBUFS;
1093
1094 /* RFC2367:
1095
1096 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1097 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1098 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1099 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1100 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1101 not true.
1102
1103 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1104 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1105 */
1106 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1107 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1108 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1109 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1110 return ERR_PTR(-EINVAL);
1111 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1112 if (key != NULL &&
1113 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1114 key->sadb_key_bits == 0)
1115 return ERR_PTR(-EINVAL);
1116 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1117 if (key != NULL &&
1118 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1119 key->sadb_key_bits == 0)
1120 return ERR_PTR(-EINVAL);
1121
1122 x = xfrm_state_alloc(net);
1123 if (x == NULL)
1124 return ERR_PTR(-ENOBUFS);
1125
1126 x->id.proto = proto;
1127 x->id.spi = sa->sadb_sa_spi;
1128 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1129 (sizeof(x->replay.bitmap) * 8));
1130 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1131 x->props.flags |= XFRM_STATE_NOECN;
1132 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1133 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1135 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1136
1137 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1138 if (lifetime != NULL) {
1139 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1140 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1141 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1142 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1143 }
1144 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1145 if (lifetime != NULL) {
1146 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1147 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1148 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1149 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1150 }
1151
1152 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1153 if (sec_ctx != NULL) {
1154 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1155
1156 if (!uctx)
1157 goto out;
1158
1159 err = security_xfrm_state_alloc(x, uctx);
1160 kfree(uctx);
1161
1162 if (err)
1163 goto out;
1164 }
1165
1166 err = -ENOBUFS;
1167 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1168 if (sa->sadb_sa_auth) {
1169 int keysize = 0;
1170 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1171 if (!a || !a->pfkey_supported) {
1172 err = -ENOSYS;
1173 goto out;
1174 }
1175 if (key)
1176 keysize = (key->sadb_key_bits + 7) / 8;
1177 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1178 if (!x->aalg) {
1179 err = -ENOMEM;
1180 goto out;
1181 }
1182 strcpy(x->aalg->alg_name, a->name);
1183 x->aalg->alg_key_len = 0;
1184 if (key) {
1185 x->aalg->alg_key_len = key->sadb_key_bits;
1186 memcpy(x->aalg->alg_key, key+1, keysize);
1187 }
1188 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1189 x->props.aalgo = sa->sadb_sa_auth;
1190 /* x->algo.flags = sa->sadb_sa_flags; */
1191 }
1192 if (sa->sadb_sa_encrypt) {
1193 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1194 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1195 if (!a || !a->pfkey_supported) {
1196 err = -ENOSYS;
1197 goto out;
1198 }
1199 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1200 if (!x->calg) {
1201 err = -ENOMEM;
1202 goto out;
1203 }
1204 strcpy(x->calg->alg_name, a->name);
1205 x->props.calgo = sa->sadb_sa_encrypt;
1206 } else {
1207 int keysize = 0;
1208 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1209 if (!a || !a->pfkey_supported) {
1210 err = -ENOSYS;
1211 goto out;
1212 }
1213 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1214 if (key)
1215 keysize = (key->sadb_key_bits + 7) / 8;
1216 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1217 if (!x->ealg) {
1218 err = -ENOMEM;
1219 goto out;
1220 }
1221 strcpy(x->ealg->alg_name, a->name);
1222 x->ealg->alg_key_len = 0;
1223 if (key) {
1224 x->ealg->alg_key_len = key->sadb_key_bits;
1225 memcpy(x->ealg->alg_key, key+1, keysize);
1226 }
1227 x->props.ealgo = sa->sadb_sa_encrypt;
1228 x->geniv = a->uinfo.encr.geniv;
1229 }
1230 }
1231 /* x->algo.flags = sa->sadb_sa_flags; */
1232
1233 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1234 &x->props.saddr);
1235 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1236 &x->id.daddr);
1237
1238 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1239 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1240 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241 if (mode < 0) {
1242 err = -EINVAL;
1243 goto out;
1244 }
1245 x->props.mode = mode;
1246 x->props.reqid = sa2->sadb_x_sa2_reqid;
1247 }
1248
1249 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1250 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1251
1252 /* Nobody uses this, but we try. */
1253 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255 }
1256
1257 if (!x->sel.family)
1258 x->sel.family = x->props.family;
1259
1260 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1261 const struct sadb_x_nat_t_type* n_type;
1262 struct xfrm_encap_tmpl *natt;
1263
1264 x->encap = kzalloc(sizeof(*x->encap), GFP_KERNEL);
1265 if (!x->encap) {
1266 err = -ENOMEM;
1267 goto out;
1268 }
1269
1270 natt = x->encap;
1271 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1272 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1273
1274 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1275 const struct sadb_x_nat_t_port *n_port =
1276 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1277 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1278 }
1279 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1280 const struct sadb_x_nat_t_port *n_port =
1281 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283 }
1284 }
1285
1286 err = xfrm_init_state(x);
1287 if (err)
1288 goto out;
1289
1290 x->km.seq = hdr->sadb_msg_seq;
1291 return x;
1292
1293 out:
1294 x->km.state = XFRM_STATE_DEAD;
1295 xfrm_state_put(x);
1296 return ERR_PTR(err);
1297 }
1298
1299 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1300 {
1301 return -EOPNOTSUPP;
1302 }
1303
1304 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1305 {
1306 struct net *net = sock_net(sk);
1307 struct sk_buff *resp_skb;
1308 struct sadb_x_sa2 *sa2;
1309 struct sadb_address *saddr, *daddr;
1310 struct sadb_msg *out_hdr;
1311 struct sadb_spirange *range;
1312 struct xfrm_state *x = NULL;
1313 int mode;
1314 int err;
1315 u32 min_spi, max_spi;
1316 u32 reqid;
1317 u8 proto;
1318 unsigned short family;
1319 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1320
1321 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1322 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1323 return -EINVAL;
1324
1325 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1326 if (proto == 0)
1327 return -EINVAL;
1328
1329 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1330 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1331 if (mode < 0)
1332 return -EINVAL;
1333 reqid = sa2->sadb_x_sa2_reqid;
1334 } else {
1335 mode = 0;
1336 reqid = 0;
1337 }
1338
1339 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1340 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1341
1342 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1343 switch (family) {
1344 case AF_INET:
1345 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1346 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1347 break;
1348 #if IS_ENABLED(CONFIG_IPV6)
1349 case AF_INET6:
1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1352 break;
1353 #endif
1354 }
1355
1356 if (hdr->sadb_msg_seq) {
1357 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1358 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1359 xfrm_state_put(x);
1360 x = NULL;
1361 }
1362 }
1363
1364 if (!x)
1365 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1366
1367 if (x == NULL)
1368 return -ENOENT;
1369
1370 min_spi = 0x100;
1371 max_spi = 0x0fffffff;
1372
1373 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1374 if (range) {
1375 min_spi = range->sadb_spirange_min;
1376 max_spi = range->sadb_spirange_max;
1377 }
1378
1379 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
1380 if (err) {
1381 xfrm_state_put(x);
1382 return err;
1383 }
1384
1385 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
1386 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1387
1388 if (IS_ERR(resp_skb)) {
1389 xfrm_state_put(x);
1390 return PTR_ERR(resp_skb);
1391 }
1392
1393 out_hdr = (struct sadb_msg *) resp_skb->data;
1394 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1395 out_hdr->sadb_msg_type = SADB_GETSPI;
1396 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1397 out_hdr->sadb_msg_errno = 0;
1398 out_hdr->sadb_msg_reserved = 0;
1399 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1400 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1401
1402 xfrm_state_put(x);
1403
1404 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1405
1406 return 0;
1407 }
1408
1409 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1410 {
1411 struct net *net = sock_net(sk);
1412 struct xfrm_state *x;
1413
1414 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1415 return -EOPNOTSUPP;
1416
1417 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1418 return 0;
1419
1420 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1421 if (x == NULL)
1422 return 0;
1423
1424 spin_lock_bh(&x->lock);
1425 if (x->km.state == XFRM_STATE_ACQ)
1426 x->km.state = XFRM_STATE_ERROR;
1427
1428 spin_unlock_bh(&x->lock);
1429 xfrm_state_put(x);
1430 return 0;
1431 }
1432
1433 static inline int event2poltype(int event)
1434 {
1435 switch (event) {
1436 case XFRM_MSG_DELPOLICY:
1437 return SADB_X_SPDDELETE;
1438 case XFRM_MSG_NEWPOLICY:
1439 return SADB_X_SPDADD;
1440 case XFRM_MSG_UPDPOLICY:
1441 return SADB_X_SPDUPDATE;
1442 case XFRM_MSG_POLEXPIRE:
1443 // return SADB_X_SPDEXPIRE;
1444 default:
1445 pr_err("pfkey: Unknown policy event %d\n", event);
1446 break;
1447 }
1448
1449 return 0;
1450 }
1451
1452 static inline int event2keytype(int event)
1453 {
1454 switch (event) {
1455 case XFRM_MSG_DELSA:
1456 return SADB_DELETE;
1457 case XFRM_MSG_NEWSA:
1458 return SADB_ADD;
1459 case XFRM_MSG_UPDSA:
1460 return SADB_UPDATE;
1461 case XFRM_MSG_EXPIRE:
1462 return SADB_EXPIRE;
1463 default:
1464 pr_err("pfkey: Unknown SA event %d\n", event);
1465 break;
1466 }
1467
1468 return 0;
1469 }
1470
1471 /* ADD/UPD/DEL */
1472 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1473 {
1474 struct sk_buff *skb;
1475 struct sadb_msg *hdr;
1476
1477 skb = pfkey_xfrm_state2msg(x);
1478
1479 if (IS_ERR(skb))
1480 return PTR_ERR(skb);
1481
1482 hdr = (struct sadb_msg *) skb->data;
1483 hdr->sadb_msg_version = PF_KEY_V2;
1484 hdr->sadb_msg_type = event2keytype(c->event);
1485 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1486 hdr->sadb_msg_errno = 0;
1487 hdr->sadb_msg_reserved = 0;
1488 hdr->sadb_msg_seq = c->seq;
1489 hdr->sadb_msg_pid = c->portid;
1490
1491 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1492
1493 return 0;
1494 }
1495
1496 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498 struct net *net = sock_net(sk);
1499 struct xfrm_state *x;
1500 int err;
1501 struct km_event c;
1502
1503 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1504 if (IS_ERR(x))
1505 return PTR_ERR(x);
1506
1507 xfrm_state_hold(x);
1508 if (hdr->sadb_msg_type == SADB_ADD)
1509 err = xfrm_state_add(x);
1510 else
1511 err = xfrm_state_update(x);
1512
1513 xfrm_audit_state_add(x, err ? 0 : 1, true);
1514
1515 if (err < 0) {
1516 x->km.state = XFRM_STATE_DEAD;
1517 __xfrm_state_put(x);
1518 goto out;
1519 }
1520
1521 if (hdr->sadb_msg_type == SADB_ADD)
1522 c.event = XFRM_MSG_NEWSA;
1523 else
1524 c.event = XFRM_MSG_UPDSA;
1525 c.seq = hdr->sadb_msg_seq;
1526 c.portid = hdr->sadb_msg_pid;
1527 km_state_notify(x, &c);
1528 out:
1529 xfrm_state_put(x);
1530 return err;
1531 }
1532
1533 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1534 {
1535 struct net *net = sock_net(sk);
1536 struct xfrm_state *x;
1537 struct km_event c;
1538 int err;
1539
1540 if (!ext_hdrs[SADB_EXT_SA-1] ||
1541 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1542 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1543 return -EINVAL;
1544
1545 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1546 if (x == NULL)
1547 return -ESRCH;
1548
1549 if ((err = security_xfrm_state_delete(x)))
1550 goto out;
1551
1552 if (xfrm_state_kern(x)) {
1553 err = -EPERM;
1554 goto out;
1555 }
1556
1557 err = xfrm_state_delete(x);
1558
1559 if (err < 0)
1560 goto out;
1561
1562 c.seq = hdr->sadb_msg_seq;
1563 c.portid = hdr->sadb_msg_pid;
1564 c.event = XFRM_MSG_DELSA;
1565 km_state_notify(x, &c);
1566 out:
1567 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1568 xfrm_state_put(x);
1569
1570 return err;
1571 }
1572
1573 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1574 {
1575 struct net *net = sock_net(sk);
1576 __u8 proto;
1577 struct sk_buff *out_skb;
1578 struct sadb_msg *out_hdr;
1579 struct xfrm_state *x;
1580
1581 if (!ext_hdrs[SADB_EXT_SA-1] ||
1582 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1583 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1584 return -EINVAL;
1585
1586 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1587 if (x == NULL)
1588 return -ESRCH;
1589
1590 out_skb = pfkey_xfrm_state2msg(x);
1591 proto = x->id.proto;
1592 xfrm_state_put(x);
1593 if (IS_ERR(out_skb))
1594 return PTR_ERR(out_skb);
1595
1596 out_hdr = (struct sadb_msg *) out_skb->data;
1597 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1598 out_hdr->sadb_msg_type = SADB_GET;
1599 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1600 out_hdr->sadb_msg_errno = 0;
1601 out_hdr->sadb_msg_reserved = 0;
1602 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1603 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1604 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1605
1606 return 0;
1607 }
1608
1609 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1610 gfp_t allocation)
1611 {
1612 struct sk_buff *skb;
1613 struct sadb_msg *hdr;
1614 int len, auth_len, enc_len, i;
1615
1616 auth_len = xfrm_count_pfkey_auth_supported();
1617 if (auth_len) {
1618 auth_len *= sizeof(struct sadb_alg);
1619 auth_len += sizeof(struct sadb_supported);
1620 }
1621
1622 enc_len = xfrm_count_pfkey_enc_supported();
1623 if (enc_len) {
1624 enc_len *= sizeof(struct sadb_alg);
1625 enc_len += sizeof(struct sadb_supported);
1626 }
1627
1628 len = enc_len + auth_len + sizeof(struct sadb_msg);
1629
1630 skb = alloc_skb(len + 16, allocation);
1631 if (!skb)
1632 goto out_put_algs;
1633
1634 hdr = skb_put(skb, sizeof(*hdr));
1635 pfkey_hdr_dup(hdr, orig);
1636 hdr->sadb_msg_errno = 0;
1637 hdr->sadb_msg_len = len / sizeof(uint64_t);
1638
1639 if (auth_len) {
1640 struct sadb_supported *sp;
1641 struct sadb_alg *ap;
1642
1643 sp = skb_put(skb, auth_len);
1644 ap = (struct sadb_alg *) (sp + 1);
1645
1646 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1647 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1648
1649 for (i = 0; ; i++) {
1650 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1651 if (!aalg)
1652 break;
1653 if (!aalg->pfkey_supported)
1654 continue;
1655 if (aalg->available)
1656 *ap++ = aalg->desc;
1657 }
1658 }
1659
1660 if (enc_len) {
1661 struct sadb_supported *sp;
1662 struct sadb_alg *ap;
1663
1664 sp = skb_put(skb, enc_len);
1665 ap = (struct sadb_alg *) (sp + 1);
1666
1667 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1668 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1669
1670 for (i = 0; ; i++) {
1671 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1672 if (!ealg)
1673 break;
1674 if (!ealg->pfkey_supported)
1675 continue;
1676 if (ealg->available)
1677 *ap++ = ealg->desc;
1678 }
1679 }
1680
1681 out_put_algs:
1682 return skb;
1683 }
1684
1685 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1686 {
1687 struct pfkey_sock *pfk = pfkey_sk(sk);
1688 struct sk_buff *supp_skb;
1689
1690 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1691 return -EINVAL;
1692
1693 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1694 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1695 return -EEXIST;
1696 pfk->registered |= (1<<hdr->sadb_msg_satype);
1697 }
1698
1699 mutex_lock(&pfkey_mutex);
1700 xfrm_probe_algs();
1701
1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1703 mutex_unlock(&pfkey_mutex);
1704
1705 if (!supp_skb) {
1706 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1707 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1708
1709 return -ENOBUFS;
1710 }
1711
1712 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1713 sock_net(sk));
1714 return 0;
1715 }
1716
1717 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1718 {
1719 struct sk_buff *skb;
1720 struct sadb_msg *hdr;
1721
1722 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1723 if (!skb)
1724 return -ENOBUFS;
1725
1726 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1727 hdr->sadb_msg_errno = (uint8_t) 0;
1728 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1729
1730 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1731 sock_net(sk));
1732 }
1733
1734 static int key_notify_sa_flush(const struct km_event *c)
1735 {
1736 struct sk_buff *skb;
1737 struct sadb_msg *hdr;
1738
1739 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1740 if (!skb)
1741 return -ENOBUFS;
1742 hdr = skb_put(skb, sizeof(struct sadb_msg));
1743 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1744 hdr->sadb_msg_type = SADB_FLUSH;
1745 hdr->sadb_msg_seq = c->seq;
1746 hdr->sadb_msg_pid = c->portid;
1747 hdr->sadb_msg_version = PF_KEY_V2;
1748 hdr->sadb_msg_errno = (uint8_t) 0;
1749 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1750 hdr->sadb_msg_reserved = 0;
1751
1752 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1753
1754 return 0;
1755 }
1756
1757 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1758 {
1759 struct net *net = sock_net(sk);
1760 unsigned int proto;
1761 struct km_event c;
1762 int err, err2;
1763
1764 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1765 if (proto == 0)
1766 return -EINVAL;
1767
1768 err = xfrm_state_flush(net, proto, true, false);
1769 err2 = unicast_flush_resp(sk, hdr);
1770 if (err || err2) {
1771 if (err == -ESRCH) /* empty table - go quietly */
1772 err = 0;
1773 return err ? err : err2;
1774 }
1775
1776 c.data.proto = proto;
1777 c.seq = hdr->sadb_msg_seq;
1778 c.portid = hdr->sadb_msg_pid;
1779 c.event = XFRM_MSG_FLUSHSA;
1780 c.net = net;
1781 km_state_notify(NULL, &c);
1782
1783 return 0;
1784 }
1785
1786 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1787 {
1788 struct pfkey_sock *pfk = ptr;
1789 struct sk_buff *out_skb;
1790 struct sadb_msg *out_hdr;
1791
1792 if (!pfkey_can_dump(&pfk->sk))
1793 return -ENOBUFS;
1794
1795 out_skb = pfkey_xfrm_state2msg(x);
1796 if (IS_ERR(out_skb))
1797 return PTR_ERR(out_skb);
1798
1799 out_hdr = (struct sadb_msg *) out_skb->data;
1800 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1801 out_hdr->sadb_msg_type = SADB_DUMP;
1802 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1803 out_hdr->sadb_msg_errno = 0;
1804 out_hdr->sadb_msg_reserved = 0;
1805 out_hdr->sadb_msg_seq = count + 1;
1806 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1807
1808 if (pfk->dump.skb)
1809 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1810 &pfk->sk, sock_net(&pfk->sk));
1811 pfk->dump.skb = out_skb;
1812
1813 return 0;
1814 }
1815
1816 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1817 {
1818 struct net *net = sock_net(&pfk->sk);
1819 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1820 }
1821
1822 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1823 {
1824 struct net *net = sock_net(&pfk->sk);
1825
1826 xfrm_state_walk_done(&pfk->dump.u.state, net);
1827 }
1828
1829 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1830 {
1831 u8 proto;
1832 struct xfrm_address_filter *filter = NULL;
1833 struct pfkey_sock *pfk = pfkey_sk(sk);
1834
1835 mutex_lock(&pfk->dump_lock);
1836 if (pfk->dump.dump != NULL) {
1837 mutex_unlock(&pfk->dump_lock);
1838 return -EBUSY;
1839 }
1840
1841 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1842 if (proto == 0) {
1843 mutex_unlock(&pfk->dump_lock);
1844 return -EINVAL;
1845 }
1846
1847 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1848 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1849
1850 if ((xfilter->sadb_x_filter_splen >
1851 (sizeof(xfrm_address_t) << 3)) ||
1852 (xfilter->sadb_x_filter_dplen >
1853 (sizeof(xfrm_address_t) << 3))) {
1854 mutex_unlock(&pfk->dump_lock);
1855 return -EINVAL;
1856 }
1857 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1858 if (filter == NULL) {
1859 mutex_unlock(&pfk->dump_lock);
1860 return -ENOMEM;
1861 }
1862
1863 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1864 sizeof(xfrm_address_t));
1865 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1866 sizeof(xfrm_address_t));
1867 filter->family = xfilter->sadb_x_filter_family;
1868 filter->splen = xfilter->sadb_x_filter_splen;
1869 filter->dplen = xfilter->sadb_x_filter_dplen;
1870 }
1871
1872 pfk->dump.msg_version = hdr->sadb_msg_version;
1873 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1874 pfk->dump.dump = pfkey_dump_sa;
1875 pfk->dump.done = pfkey_dump_sa_done;
1876 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1877 mutex_unlock(&pfk->dump_lock);
1878
1879 return pfkey_do_dump(pfk);
1880 }
1881
1882 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1883 {
1884 struct pfkey_sock *pfk = pfkey_sk(sk);
1885 int satype = hdr->sadb_msg_satype;
1886 bool reset_errno = false;
1887
1888 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1889 reset_errno = true;
1890 if (satype != 0 && satype != 1)
1891 return -EINVAL;
1892 pfk->promisc = satype;
1893 }
1894 if (reset_errno && skb_cloned(skb))
1895 skb = skb_copy(skb, GFP_KERNEL);
1896 else
1897 skb = skb_clone(skb, GFP_KERNEL);
1898
1899 if (reset_errno && skb) {
1900 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1901 new_hdr->sadb_msg_errno = 0;
1902 }
1903
1904 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1905 return 0;
1906 }
1907
1908 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1909 {
1910 int i;
1911 u32 reqid = *(u32*)ptr;
1912
1913 for (i=0; i<xp->xfrm_nr; i++) {
1914 if (xp->xfrm_vec[i].reqid == reqid)
1915 return -EEXIST;
1916 }
1917 return 0;
1918 }
1919
1920 static u32 gen_reqid(struct net *net)
1921 {
1922 struct xfrm_policy_walk walk;
1923 u32 start;
1924 int rc;
1925 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1926
1927 start = reqid;
1928 do {
1929 ++reqid;
1930 if (reqid == 0)
1931 reqid = IPSEC_MANUAL_REQID_MAX+1;
1932 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1933 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1934 xfrm_policy_walk_done(&walk, net);
1935 if (rc != -EEXIST)
1936 return reqid;
1937 } while (reqid != start);
1938 return 0;
1939 }
1940
1941 static int
1942 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol,
1943 struct sadb_x_ipsecrequest *rq)
1944 {
1945 struct net *net = xp_net(xp);
1946 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947 int mode;
1948
1949 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950 return -ELOOP;
1951
1952 if (rq->sadb_x_ipsecrequest_mode == 0)
1953 return -EINVAL;
1954 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955 return -EINVAL;
1956
1957 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959 return -EINVAL;
1960 t->mode = mode;
1961 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) {
1962 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) &&
1963 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND)
1964 return -EINVAL;
1965 t->optional = 1;
1966 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1967 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1968 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1969 t->reqid = 0;
1970 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1971 return -ENOBUFS;
1972 }
1973
1974 /* addresses present only in tunnel mode */
1975 if (t->mode == XFRM_MODE_TUNNEL) {
1976 int err;
1977
1978 err = parse_sockaddr_pair(
1979 (struct sockaddr *)(rq + 1),
1980 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1981 &t->saddr, &t->id.daddr, &t->encap_family);
1982 if (err)
1983 return err;
1984 } else
1985 t->encap_family = xp->family;
1986
1987 /* No way to set this via kame pfkey */
1988 t->allalgs = 1;
1989 xp->xfrm_nr++;
1990 return 0;
1991 }
1992
1993 static int
1994 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1995 {
1996 int err;
1997 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1998 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1999
2000 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2001 return -EINVAL;
2002
2003 while (len >= sizeof(*rq)) {
2004 if (len < rq->sadb_x_ipsecrequest_len ||
2005 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2006 return -EINVAL;
2007
2008 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0)
2009 return err;
2010 len -= rq->sadb_x_ipsecrequest_len;
2011 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2012 }
2013 return 0;
2014 }
2015
2016 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2017 {
2018 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2019
2020 if (xfrm_ctx) {
2021 int len = sizeof(struct sadb_x_sec_ctx);
2022 len += xfrm_ctx->ctx_len;
2023 return PFKEY_ALIGN8(len);
2024 }
2025 return 0;
2026 }
2027
2028 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2029 {
2030 const struct xfrm_tmpl *t;
2031 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2032 int socklen = 0;
2033 int i;
2034
2035 for (i=0; i<xp->xfrm_nr; i++) {
2036 t = xp->xfrm_vec + i;
2037 socklen += pfkey_sockaddr_len(t->encap_family);
2038 }
2039
2040 return sizeof(struct sadb_msg) +
2041 (sizeof(struct sadb_lifetime) * 3) +
2042 (sizeof(struct sadb_address) * 2) +
2043 (sockaddr_size * 2) +
2044 sizeof(struct sadb_x_policy) +
2045 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2046 (socklen * 2) +
2047 pfkey_xfrm_policy2sec_ctx_size(xp);
2048 }
2049
2050 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2051 {
2052 struct sk_buff *skb;
2053 int size;
2054
2055 size = pfkey_xfrm_policy2msg_size(xp);
2056
2057 skb = alloc_skb(size + 16, GFP_ATOMIC);
2058 if (skb == NULL)
2059 return ERR_PTR(-ENOBUFS);
2060
2061 return skb;
2062 }
2063
2064 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2065 {
2066 struct sadb_msg *hdr;
2067 struct sadb_address *addr;
2068 struct sadb_lifetime *lifetime;
2069 struct sadb_x_policy *pol;
2070 struct sadb_x_sec_ctx *sec_ctx;
2071 struct xfrm_sec_ctx *xfrm_ctx;
2072 int i;
2073 int size;
2074 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2075 int socklen = pfkey_sockaddr_len(xp->family);
2076
2077 size = pfkey_xfrm_policy2msg_size(xp);
2078
2079 /* call should fill header later */
2080 hdr = skb_put(skb, sizeof(struct sadb_msg));
2081 memset(hdr, 0, size); /* XXX do we need this ? */
2082
2083 /* src address */
2084 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2085 addr->sadb_address_len =
2086 (sizeof(struct sadb_address)+sockaddr_size)/
2087 sizeof(uint64_t);
2088 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2089 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2090 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2091 addr->sadb_address_reserved = 0;
2092 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2093 xp->selector.sport,
2094 (struct sockaddr *) (addr + 1),
2095 xp->family))
2096 BUG();
2097
2098 /* dst address */
2099 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2100 addr->sadb_address_len =
2101 (sizeof(struct sadb_address)+sockaddr_size)/
2102 sizeof(uint64_t);
2103 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2104 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2105 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2106 addr->sadb_address_reserved = 0;
2107
2108 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2109 (struct sockaddr *) (addr + 1),
2110 xp->family);
2111
2112 /* hard time */
2113 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2114 lifetime->sadb_lifetime_len =
2115 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2116 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2117 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2118 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2119 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2120 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2121 /* soft time */
2122 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2123 lifetime->sadb_lifetime_len =
2124 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2125 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2126 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2127 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2128 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2129 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2130 /* current time */
2131 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2132 lifetime->sadb_lifetime_len =
2133 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2134 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2135 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2136 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2137 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2138 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2139
2140 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2141 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2142 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2143 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2144 if (xp->action == XFRM_POLICY_ALLOW) {
2145 if (xp->xfrm_nr)
2146 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2147 else
2148 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2149 }
2150 pol->sadb_x_policy_dir = dir+1;
2151 pol->sadb_x_policy_reserved = 0;
2152 pol->sadb_x_policy_id = xp->index;
2153 pol->sadb_x_policy_priority = xp->priority;
2154
2155 for (i=0; i<xp->xfrm_nr; i++) {
2156 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2157 struct sadb_x_ipsecrequest *rq;
2158 int req_size;
2159 int mode;
2160
2161 req_size = sizeof(struct sadb_x_ipsecrequest);
2162 if (t->mode == XFRM_MODE_TUNNEL) {
2163 socklen = pfkey_sockaddr_len(t->encap_family);
2164 req_size += socklen * 2;
2165 } else {
2166 size -= 2*socklen;
2167 }
2168 rq = skb_put(skb, req_size);
2169 pol->sadb_x_policy_len += req_size/8;
2170 memset(rq, 0, sizeof(*rq));
2171 rq->sadb_x_ipsecrequest_len = req_size;
2172 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2173 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2174 return -EINVAL;
2175 rq->sadb_x_ipsecrequest_mode = mode;
2176 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2177 if (t->reqid)
2178 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2179 if (t->optional)
2180 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2181 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2182
2183 if (t->mode == XFRM_MODE_TUNNEL) {
2184 u8 *sa = (void *)(rq + 1);
2185 pfkey_sockaddr_fill(&t->saddr, 0,
2186 (struct sockaddr *)sa,
2187 t->encap_family);
2188 pfkey_sockaddr_fill(&t->id.daddr, 0,
2189 (struct sockaddr *) (sa + socklen),
2190 t->encap_family);
2191 }
2192 }
2193
2194 /* security context */
2195 if ((xfrm_ctx = xp->security)) {
2196 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2197
2198 sec_ctx = skb_put(skb, ctx_size);
2199 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2200 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2201 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2202 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2203 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2204 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2205 xfrm_ctx->ctx_len);
2206 }
2207
2208 hdr->sadb_msg_len = size / sizeof(uint64_t);
2209 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2210
2211 return 0;
2212 }
2213
2214 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2215 {
2216 struct sk_buff *out_skb;
2217 struct sadb_msg *out_hdr;
2218 int err;
2219
2220 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2221 if (IS_ERR(out_skb))
2222 return PTR_ERR(out_skb);
2223
2224 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2225 if (err < 0) {
2226 kfree_skb(out_skb);
2227 return err;
2228 }
2229
2230 out_hdr = (struct sadb_msg *) out_skb->data;
2231 out_hdr->sadb_msg_version = PF_KEY_V2;
2232
2233 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2234 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2235 else
2236 out_hdr->sadb_msg_type = event2poltype(c->event);
2237 out_hdr->sadb_msg_errno = 0;
2238 out_hdr->sadb_msg_seq = c->seq;
2239 out_hdr->sadb_msg_pid = c->portid;
2240 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2241 return 0;
2242
2243 }
2244
2245 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2246 {
2247 struct net *net = sock_net(sk);
2248 int err = 0;
2249 struct sadb_lifetime *lifetime;
2250 struct sadb_address *sa;
2251 struct sadb_x_policy *pol;
2252 struct xfrm_policy *xp;
2253 struct km_event c;
2254 struct sadb_x_sec_ctx *sec_ctx;
2255
2256 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2257 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2258 !ext_hdrs[SADB_X_EXT_POLICY-1])
2259 return -EINVAL;
2260
2261 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2262 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2263 return -EINVAL;
2264 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2265 return -EINVAL;
2266
2267 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2268 if (xp == NULL)
2269 return -ENOBUFS;
2270
2271 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2272 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2273 xp->priority = pol->sadb_x_policy_priority;
2274
2275 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2276 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2277 xp->selector.family = xp->family;
2278 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2279 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2280 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2281 if (xp->selector.sport)
2282 xp->selector.sport_mask = htons(0xffff);
2283
2284 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2285 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2286 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2287
2288 /* Amusing, we set this twice. KAME apps appear to set same value
2289 * in both addresses.
2290 */
2291 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2292
2293 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2294 if (xp->selector.dport)
2295 xp->selector.dport_mask = htons(0xffff);
2296
2297 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2298 if (sec_ctx != NULL) {
2299 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2300
2301 if (!uctx) {
2302 err = -ENOBUFS;
2303 goto out;
2304 }
2305
2306 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2307 kfree(uctx);
2308
2309 if (err)
2310 goto out;
2311 }
2312
2313 xp->lft.soft_byte_limit = XFRM_INF;
2314 xp->lft.hard_byte_limit = XFRM_INF;
2315 xp->lft.soft_packet_limit = XFRM_INF;
2316 xp->lft.hard_packet_limit = XFRM_INF;
2317 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2318 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2319 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2320 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2321 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2322 }
2323 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2324 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2325 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2326 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2327 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2328 }
2329 xp->xfrm_nr = 0;
2330 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2331 (err = parse_ipsecrequests(xp, pol)) < 0)
2332 goto out;
2333
2334 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2335 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2336
2337 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2338
2339 if (err)
2340 goto out;
2341
2342 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2343 c.event = XFRM_MSG_UPDPOLICY;
2344 else
2345 c.event = XFRM_MSG_NEWPOLICY;
2346
2347 c.seq = hdr->sadb_msg_seq;
2348 c.portid = hdr->sadb_msg_pid;
2349
2350 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2351 xfrm_pol_put(xp);
2352 return 0;
2353
2354 out:
2355 xp->walk.dead = 1;
2356 xfrm_policy_destroy(xp);
2357 return err;
2358 }
2359
2360 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2361 {
2362 struct net *net = sock_net(sk);
2363 int err;
2364 struct sadb_address *sa;
2365 struct sadb_x_policy *pol;
2366 struct xfrm_policy *xp;
2367 struct xfrm_selector sel;
2368 struct km_event c;
2369 struct sadb_x_sec_ctx *sec_ctx;
2370 struct xfrm_sec_ctx *pol_ctx = NULL;
2371
2372 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2373 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2374 !ext_hdrs[SADB_X_EXT_POLICY-1])
2375 return -EINVAL;
2376
2377 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2378 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2379 return -EINVAL;
2380
2381 memset(&sel, 0, sizeof(sel));
2382
2383 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2384 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2385 sel.prefixlen_s = sa->sadb_address_prefixlen;
2386 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2387 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2388 if (sel.sport)
2389 sel.sport_mask = htons(0xffff);
2390
2391 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2392 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2393 sel.prefixlen_d = sa->sadb_address_prefixlen;
2394 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2395 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2396 if (sel.dport)
2397 sel.dport_mask = htons(0xffff);
2398
2399 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2400 if (sec_ctx != NULL) {
2401 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2402
2403 if (!uctx)
2404 return -ENOMEM;
2405
2406 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2407 kfree(uctx);
2408 if (err)
2409 return err;
2410 }
2411
2412 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2413 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2414 1, &err);
2415 security_xfrm_policy_free(pol_ctx);
2416 if (xp == NULL)
2417 return -ENOENT;
2418
2419 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2420
2421 if (err)
2422 goto out;
2423
2424 c.seq = hdr->sadb_msg_seq;
2425 c.portid = hdr->sadb_msg_pid;
2426 c.data.byid = 0;
2427 c.event = XFRM_MSG_DELPOLICY;
2428 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2429
2430 out:
2431 xfrm_pol_put(xp);
2432 return err;
2433 }
2434
2435 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2436 {
2437 int err;
2438 struct sk_buff *out_skb;
2439 struct sadb_msg *out_hdr;
2440 err = 0;
2441
2442 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2443 if (IS_ERR(out_skb)) {
2444 err = PTR_ERR(out_skb);
2445 goto out;
2446 }
2447 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2448 if (err < 0) {
2449 kfree_skb(out_skb);
2450 goto out;
2451 }
2452
2453 out_hdr = (struct sadb_msg *) out_skb->data;
2454 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2455 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2456 out_hdr->sadb_msg_satype = 0;
2457 out_hdr->sadb_msg_errno = 0;
2458 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2459 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2460 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2461 err = 0;
2462
2463 out:
2464 return err;
2465 }
2466
2467 static int pfkey_sockaddr_pair_size(sa_family_t family)
2468 {
2469 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2470 }
2471
2472 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2473 xfrm_address_t *saddr, xfrm_address_t *daddr,
2474 u16 *family)
2475 {
2476 int af, socklen;
2477
2478 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2479 return -EINVAL;
2480
2481 af = pfkey_sockaddr_extract(sa, saddr);
2482 if (!af)
2483 return -EINVAL;
2484
2485 socklen = pfkey_sockaddr_len(af);
2486 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2487 daddr) != af)
2488 return -EINVAL;
2489
2490 *family = af;
2491 return 0;
2492 }
2493
2494 #ifdef CONFIG_NET_KEY_MIGRATE
2495 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2496 struct xfrm_migrate *m)
2497 {
2498 int err;
2499 struct sadb_x_ipsecrequest *rq2;
2500 int mode;
2501
2502 if (len < sizeof(*rq1) ||
2503 len < rq1->sadb_x_ipsecrequest_len ||
2504 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2505 return -EINVAL;
2506
2507 /* old endoints */
2508 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2509 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2510 &m->old_saddr, &m->old_daddr,
2511 &m->old_family);
2512 if (err)
2513 return err;
2514
2515 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2516 len -= rq1->sadb_x_ipsecrequest_len;
2517
2518 if (len <= sizeof(*rq2) ||
2519 len < rq2->sadb_x_ipsecrequest_len ||
2520 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2521 return -EINVAL;
2522
2523 /* new endpoints */
2524 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2525 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2526 &m->new_saddr, &m->new_daddr,
2527 &m->new_family);
2528 if (err)
2529 return err;
2530
2531 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2532 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2533 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2534 return -EINVAL;
2535
2536 m->proto = rq1->sadb_x_ipsecrequest_proto;
2537 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2538 return -EINVAL;
2539 m->mode = mode;
2540 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2541
2542 return ((int)(rq1->sadb_x_ipsecrequest_len +
2543 rq2->sadb_x_ipsecrequest_len));
2544 }
2545
2546 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2547 const struct sadb_msg *hdr, void * const *ext_hdrs)
2548 {
2549 int i, len, ret, err = -EINVAL;
2550 u8 dir;
2551 struct sadb_address *sa;
2552 struct sadb_x_kmaddress *kma;
2553 struct sadb_x_policy *pol;
2554 struct sadb_x_ipsecrequest *rq;
2555 struct xfrm_selector sel;
2556 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2557 struct xfrm_kmaddress k;
2558 struct net *net = sock_net(sk);
2559
2560 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2561 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2562 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2563 err = -EINVAL;
2564 goto out;
2565 }
2566
2567 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2568 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2569
2570 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2571 err = -EINVAL;
2572 goto out;
2573 }
2574
2575 if (kma) {
2576 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2577 k.reserved = kma->sadb_x_kmaddress_reserved;
2578 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2579 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2580 &k.local, &k.remote, &k.family);
2581 if (ret < 0) {
2582 err = ret;
2583 goto out;
2584 }
2585 }
2586
2587 dir = pol->sadb_x_policy_dir - 1;
2588 memset(&sel, 0, sizeof(sel));
2589
2590 /* set source address info of selector */
2591 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2592 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2593 sel.prefixlen_s = sa->sadb_address_prefixlen;
2594 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2595 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2596 if (sel.sport)
2597 sel.sport_mask = htons(0xffff);
2598
2599 /* set destination address info of selector */
2600 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2601 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2602 sel.prefixlen_d = sa->sadb_address_prefixlen;
2603 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2604 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2605 if (sel.dport)
2606 sel.dport_mask = htons(0xffff);
2607
2608 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2609
2610 /* extract ipsecrequests */
2611 i = 0;
2612 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2613
2614 while (len > 0 && i < XFRM_MAX_DEPTH) {
2615 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2616 if (ret < 0) {
2617 err = ret;
2618 goto out;
2619 } else {
2620 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2621 len -= ret;
2622 i++;
2623 }
2624 }
2625
2626 if (!i || len > 0) {
2627 err = -EINVAL;
2628 goto out;
2629 }
2630
2631 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2632 kma ? &k : NULL, net, NULL, 0, NULL);
2633
2634 out:
2635 return err;
2636 }
2637 #else
2638 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2639 const struct sadb_msg *hdr, void * const *ext_hdrs)
2640 {
2641 return -ENOPROTOOPT;
2642 }
2643 #endif
2644
2645
2646 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2647 {
2648 struct net *net = sock_net(sk);
2649 unsigned int dir;
2650 int err = 0, delete;
2651 struct sadb_x_policy *pol;
2652 struct xfrm_policy *xp;
2653 struct km_event c;
2654
2655 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2656 return -EINVAL;
2657
2658 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2659 if (dir >= XFRM_POLICY_MAX)
2660 return -EINVAL;
2661
2662 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2663 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2664 dir, pol->sadb_x_policy_id, delete, &err);
2665 if (xp == NULL)
2666 return -ENOENT;
2667
2668 if (delete) {
2669 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2670
2671 if (err)
2672 goto out;
2673 c.seq = hdr->sadb_msg_seq;
2674 c.portid = hdr->sadb_msg_pid;
2675 c.data.byid = 1;
2676 c.event = XFRM_MSG_DELPOLICY;
2677 km_policy_notify(xp, dir, &c);
2678 } else {
2679 err = key_pol_get_resp(sk, xp, hdr, dir);
2680 }
2681
2682 out:
2683 xfrm_pol_put(xp);
2684 return err;
2685 }
2686
2687 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2688 {
2689 struct pfkey_sock *pfk = ptr;
2690 struct sk_buff *out_skb;
2691 struct sadb_msg *out_hdr;
2692 int err;
2693
2694 if (!pfkey_can_dump(&pfk->sk))
2695 return -ENOBUFS;
2696
2697 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2698 if (IS_ERR(out_skb))
2699 return PTR_ERR(out_skb);
2700
2701 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2702 if (err < 0) {
2703 kfree_skb(out_skb);
2704 return err;
2705 }
2706
2707 out_hdr = (struct sadb_msg *) out_skb->data;
2708 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2709 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2710 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711 out_hdr->sadb_msg_errno = 0;
2712 out_hdr->sadb_msg_seq = count + 1;
2713 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2714
2715 if (pfk->dump.skb)
2716 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2717 &pfk->sk, sock_net(&pfk->sk));
2718 pfk->dump.skb = out_skb;
2719
2720 return 0;
2721 }
2722
2723 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2724 {
2725 struct net *net = sock_net(&pfk->sk);
2726 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2727 }
2728
2729 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2730 {
2731 struct net *net = sock_net((struct sock *)pfk);
2732
2733 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2734 }
2735
2736 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2737 {
2738 struct pfkey_sock *pfk = pfkey_sk(sk);
2739
2740 mutex_lock(&pfk->dump_lock);
2741 if (pfk->dump.dump != NULL) {
2742 mutex_unlock(&pfk->dump_lock);
2743 return -EBUSY;
2744 }
2745
2746 pfk->dump.msg_version = hdr->sadb_msg_version;
2747 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2748 pfk->dump.dump = pfkey_dump_sp;
2749 pfk->dump.done = pfkey_dump_sp_done;
2750 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2751 mutex_unlock(&pfk->dump_lock);
2752
2753 return pfkey_do_dump(pfk);
2754 }
2755
2756 static int key_notify_policy_flush(const struct km_event *c)
2757 {
2758 struct sk_buff *skb_out;
2759 struct sadb_msg *hdr;
2760
2761 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2762 if (!skb_out)
2763 return -ENOBUFS;
2764 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2765 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2766 hdr->sadb_msg_seq = c->seq;
2767 hdr->sadb_msg_pid = c->portid;
2768 hdr->sadb_msg_version = PF_KEY_V2;
2769 hdr->sadb_msg_errno = (uint8_t) 0;
2770 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2771 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2772 hdr->sadb_msg_reserved = 0;
2773 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2774 return 0;
2775
2776 }
2777
2778 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2779 {
2780 struct net *net = sock_net(sk);
2781 struct km_event c;
2782 int err, err2;
2783
2784 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2785 err2 = unicast_flush_resp(sk, hdr);
2786 if (err || err2) {
2787 if (err == -ESRCH) /* empty table - old silent behavior */
2788 return 0;
2789 return err;
2790 }
2791
2792 c.data.type = XFRM_POLICY_TYPE_MAIN;
2793 c.event = XFRM_MSG_FLUSHPOLICY;
2794 c.portid = hdr->sadb_msg_pid;
2795 c.seq = hdr->sadb_msg_seq;
2796 c.net = net;
2797 km_policy_notify(NULL, 0, &c);
2798
2799 return 0;
2800 }
2801
2802 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2803 const struct sadb_msg *hdr, void * const *ext_hdrs);
2804 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2805 [SADB_RESERVED] = pfkey_reserved,
2806 [SADB_GETSPI] = pfkey_getspi,
2807 [SADB_UPDATE] = pfkey_add,
2808 [SADB_ADD] = pfkey_add,
2809 [SADB_DELETE] = pfkey_delete,
2810 [SADB_GET] = pfkey_get,
2811 [SADB_ACQUIRE] = pfkey_acquire,
2812 [SADB_REGISTER] = pfkey_register,
2813 [SADB_EXPIRE] = NULL,
2814 [SADB_FLUSH] = pfkey_flush,
2815 [SADB_DUMP] = pfkey_dump,
2816 [SADB_X_PROMISC] = pfkey_promisc,
2817 [SADB_X_PCHANGE] = NULL,
2818 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2819 [SADB_X_SPDADD] = pfkey_spdadd,
2820 [SADB_X_SPDDELETE] = pfkey_spddelete,
2821 [SADB_X_SPDGET] = pfkey_spdget,
2822 [SADB_X_SPDACQUIRE] = NULL,
2823 [SADB_X_SPDDUMP] = pfkey_spddump,
2824 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2825 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2826 [SADB_X_SPDDELETE2] = pfkey_spdget,
2827 [SADB_X_MIGRATE] = pfkey_migrate,
2828 };
2829
2830 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2831 {
2832 void *ext_hdrs[SADB_EXT_MAX];
2833 int err;
2834
2835 /* Non-zero return value of pfkey_broadcast() does not always signal
2836 * an error and even on an actual error we may still want to process
2837 * the message so rather ignore the return value.
2838 */
2839 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2840 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2841
2842 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2843 err = parse_exthdrs(skb, hdr, ext_hdrs);
2844 if (!err) {
2845 err = -EOPNOTSUPP;
2846 if (pfkey_funcs[hdr->sadb_msg_type])
2847 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2848 }
2849 return err;
2850 }
2851
2852 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2853 {
2854 struct sadb_msg *hdr = NULL;
2855
2856 if (skb->len < sizeof(*hdr)) {
2857 *errp = -EMSGSIZE;
2858 } else {
2859 hdr = (struct sadb_msg *) skb->data;
2860 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2861 hdr->sadb_msg_reserved != 0 ||
2862 (hdr->sadb_msg_type <= SADB_RESERVED ||
2863 hdr->sadb_msg_type > SADB_MAX)) {
2864 hdr = NULL;
2865 *errp = -EINVAL;
2866 } else if (hdr->sadb_msg_len != (skb->len /
2867 sizeof(uint64_t)) ||
2868 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2869 sizeof(uint64_t))) {
2870 hdr = NULL;
2871 *errp = -EMSGSIZE;
2872 } else {
2873 *errp = 0;
2874 }
2875 }
2876 return hdr;
2877 }
2878
2879 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2880 const struct xfrm_algo_desc *d)
2881 {
2882 unsigned int id = d->desc.sadb_alg_id;
2883
2884 if (id >= sizeof(t->aalgos) * 8)
2885 return 0;
2886
2887 return (t->aalgos >> id) & 1;
2888 }
2889
2890 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2891 const struct xfrm_algo_desc *d)
2892 {
2893 unsigned int id = d->desc.sadb_alg_id;
2894
2895 if (id >= sizeof(t->ealgos) * 8)
2896 return 0;
2897
2898 return (t->ealgos >> id) & 1;
2899 }
2900
2901 static int count_ah_combs(const struct xfrm_tmpl *t)
2902 {
2903 int i, sz = 0;
2904
2905 for (i = 0; ; i++) {
2906 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2907 if (!aalg)
2908 break;
2909 if (!aalg->pfkey_supported)
2910 continue;
2911 if (aalg_tmpl_set(t, aalg))
2912 sz += sizeof(struct sadb_comb);
2913 }
2914 return sz + sizeof(struct sadb_prop);
2915 }
2916
2917 static int count_esp_combs(const struct xfrm_tmpl *t)
2918 {
2919 int i, k, sz = 0;
2920
2921 for (i = 0; ; i++) {
2922 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2923 if (!ealg)
2924 break;
2925
2926 if (!ealg->pfkey_supported)
2927 continue;
2928
2929 if (!(ealg_tmpl_set(t, ealg)))
2930 continue;
2931
2932 for (k = 1; ; k++) {
2933 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2934 if (!aalg)
2935 break;
2936
2937 if (!aalg->pfkey_supported)
2938 continue;
2939
2940 if (aalg_tmpl_set(t, aalg))
2941 sz += sizeof(struct sadb_comb);
2942 }
2943 }
2944 return sz + sizeof(struct sadb_prop);
2945 }
2946
2947 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2948 {
2949 struct sadb_prop *p;
2950 int sz = 0;
2951 int i;
2952
2953 p = skb_put(skb, sizeof(struct sadb_prop));
2954 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2955 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2956 p->sadb_prop_replay = 32;
2957 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2958
2959 for (i = 0; ; i++) {
2960 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2961 if (!aalg)
2962 break;
2963
2964 if (!aalg->pfkey_supported)
2965 continue;
2966
2967 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2968 struct sadb_comb *c;
2969 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2970 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2971 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2972 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2973 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2974 c->sadb_comb_hard_addtime = 24*60*60;
2975 c->sadb_comb_soft_addtime = 20*60*60;
2976 c->sadb_comb_hard_usetime = 8*60*60;
2977 c->sadb_comb_soft_usetime = 7*60*60;
2978 sz += sizeof(*c);
2979 }
2980 }
2981
2982 return sz + sizeof(*p);
2983 }
2984
2985 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2986 {
2987 struct sadb_prop *p;
2988 int sz = 0;
2989 int i, k;
2990
2991 p = skb_put(skb, sizeof(struct sadb_prop));
2992 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2993 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2994 p->sadb_prop_replay = 32;
2995 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2996
2997 for (i=0; ; i++) {
2998 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2999 if (!ealg)
3000 break;
3001
3002 if (!ealg->pfkey_supported)
3003 continue;
3004
3005 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3006 continue;
3007
3008 for (k = 1; ; k++) {
3009 struct sadb_comb *c;
3010 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3011 if (!aalg)
3012 break;
3013 if (!aalg->pfkey_supported)
3014 continue;
3015 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3016 continue;
3017 c = skb_put(skb, sizeof(struct sadb_comb));
3018 memset(c, 0, sizeof(*c));
3019 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3020 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3021 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3022 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3023 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3024 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3025 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3026 c->sadb_comb_hard_addtime = 24*60*60;
3027 c->sadb_comb_soft_addtime = 20*60*60;
3028 c->sadb_comb_hard_usetime = 8*60*60;
3029 c->sadb_comb_soft_usetime = 7*60*60;
3030 sz += sizeof(*c);
3031 }
3032 }
3033
3034 return sz + sizeof(*p);
3035 }
3036
3037 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3038 {
3039 return 0;
3040 }
3041
3042 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3043 {
3044 struct sk_buff *out_skb;
3045 struct sadb_msg *out_hdr;
3046 int hard;
3047 int hsc;
3048
3049 hard = c->data.hard;
3050 if (hard)
3051 hsc = 2;
3052 else
3053 hsc = 1;
3054
3055 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3056 if (IS_ERR(out_skb))
3057 return PTR_ERR(out_skb);
3058
3059 out_hdr = (struct sadb_msg *) out_skb->data;
3060 out_hdr->sadb_msg_version = PF_KEY_V2;
3061 out_hdr->sadb_msg_type = SADB_EXPIRE;
3062 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3063 out_hdr->sadb_msg_errno = 0;
3064 out_hdr->sadb_msg_reserved = 0;
3065 out_hdr->sadb_msg_seq = 0;
3066 out_hdr->sadb_msg_pid = 0;
3067
3068 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3069 xs_net(x));
3070 return 0;
3071 }
3072
3073 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3074 {
3075 struct net *net = x ? xs_net(x) : c->net;
3076 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3077
3078 if (atomic_read(&net_pfkey->socks_nr) == 0)
3079 return 0;
3080
3081 switch (c->event) {
3082 case XFRM_MSG_EXPIRE:
3083 return key_notify_sa_expire(x, c);
3084 case XFRM_MSG_DELSA:
3085 case XFRM_MSG_NEWSA:
3086 case XFRM_MSG_UPDSA:
3087 return key_notify_sa(x, c);
3088 case XFRM_MSG_FLUSHSA:
3089 return key_notify_sa_flush(c);
3090 case XFRM_MSG_NEWAE: /* not yet supported */
3091 break;
3092 default:
3093 pr_err("pfkey: Unknown SA event %d\n", c->event);
3094 break;
3095 }
3096
3097 return 0;
3098 }
3099
3100 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3101 {
3102 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3103 return 0;
3104
3105 switch (c->event) {
3106 case XFRM_MSG_POLEXPIRE:
3107 return key_notify_policy_expire(xp, c);
3108 case XFRM_MSG_DELPOLICY:
3109 case XFRM_MSG_NEWPOLICY:
3110 case XFRM_MSG_UPDPOLICY:
3111 return key_notify_policy(xp, dir, c);
3112 case XFRM_MSG_FLUSHPOLICY:
3113 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3114 break;
3115 return key_notify_policy_flush(c);
3116 default:
3117 pr_err("pfkey: Unknown policy event %d\n", c->event);
3118 break;
3119 }
3120
3121 return 0;
3122 }
3123
3124 static u32 get_acqseq(void)
3125 {
3126 u32 res;
3127 static atomic_t acqseq;
3128
3129 do {
3130 res = atomic_inc_return(&acqseq);
3131 } while (!res);
3132 return res;
3133 }
3134
3135 static bool pfkey_is_alive(const struct km_event *c)
3136 {
3137 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3138 struct sock *sk;
3139 bool is_alive = false;
3140
3141 rcu_read_lock();
3142 sk_for_each_rcu(sk, &net_pfkey->table) {
3143 if (pfkey_sk(sk)->registered) {
3144 is_alive = true;
3145 break;
3146 }
3147 }
3148 rcu_read_unlock();
3149
3150 return is_alive;
3151 }
3152
3153 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3154 {
3155 struct sk_buff *skb;
3156 struct sadb_msg *hdr;
3157 struct sadb_address *addr;
3158 struct sadb_x_policy *pol;
3159 int sockaddr_size;
3160 int size;
3161 struct sadb_x_sec_ctx *sec_ctx;
3162 struct xfrm_sec_ctx *xfrm_ctx;
3163 int ctx_size = 0;
3164 int alg_size = 0;
3165
3166 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3167 if (!sockaddr_size)
3168 return -EINVAL;
3169
3170 size = sizeof(struct sadb_msg) +
3171 (sizeof(struct sadb_address) * 2) +
3172 (sockaddr_size * 2) +
3173 sizeof(struct sadb_x_policy);
3174
3175 if (x->id.proto == IPPROTO_AH)
3176 alg_size = count_ah_combs(t);
3177 else if (x->id.proto == IPPROTO_ESP)
3178 alg_size = count_esp_combs(t);
3179
3180 if ((xfrm_ctx = x->security)) {
3181 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3182 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3183 }
3184
3185 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3186 if (skb == NULL)
3187 return -ENOMEM;
3188
3189 hdr = skb_put(skb, sizeof(struct sadb_msg));
3190 hdr->sadb_msg_version = PF_KEY_V2;
3191 hdr->sadb_msg_type = SADB_ACQUIRE;
3192 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3193 hdr->sadb_msg_len = size / sizeof(uint64_t);
3194 hdr->sadb_msg_errno = 0;
3195 hdr->sadb_msg_reserved = 0;
3196 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3197 hdr->sadb_msg_pid = 0;
3198
3199 /* src address */
3200 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3201 addr->sadb_address_len =
3202 (sizeof(struct sadb_address)+sockaddr_size)/
3203 sizeof(uint64_t);
3204 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3205 addr->sadb_address_proto = 0;
3206 addr->sadb_address_reserved = 0;
3207 addr->sadb_address_prefixlen =
3208 pfkey_sockaddr_fill(&x->props.saddr, 0,
3209 (struct sockaddr *) (addr + 1),
3210 x->props.family);
3211 if (!addr->sadb_address_prefixlen)
3212 BUG();
3213
3214 /* dst address */
3215 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3216 addr->sadb_address_len =
3217 (sizeof(struct sadb_address)+sockaddr_size)/
3218 sizeof(uint64_t);
3219 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3220 addr->sadb_address_proto = 0;
3221 addr->sadb_address_reserved = 0;
3222 addr->sadb_address_prefixlen =
3223 pfkey_sockaddr_fill(&x->id.daddr, 0,
3224 (struct sockaddr *) (addr + 1),
3225 x->props.family);
3226 if (!addr->sadb_address_prefixlen)
3227 BUG();
3228
3229 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3230 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3231 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3232 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3233 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3234 pol->sadb_x_policy_reserved = 0;
3235 pol->sadb_x_policy_id = xp->index;
3236 pol->sadb_x_policy_priority = xp->priority;
3237
3238 /* Set sadb_comb's. */
3239 alg_size = 0;
3240 if (x->id.proto == IPPROTO_AH)
3241 alg_size = dump_ah_combs(skb, t);
3242 else if (x->id.proto == IPPROTO_ESP)
3243 alg_size = dump_esp_combs(skb, t);
3244
3245 hdr->sadb_msg_len += alg_size / 8;
3246
3247 /* security context */
3248 if (xfrm_ctx) {
3249 sec_ctx = skb_put(skb,
3250 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3251 sec_ctx->sadb_x_sec_len =
3252 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3253 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3254 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3255 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3256 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3257 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3258 xfrm_ctx->ctx_len);
3259 }
3260
3261 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3262 xs_net(x));
3263 }
3264
3265 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3266 u8 *data, int len, int *dir)
3267 {
3268 struct net *net = sock_net(sk);
3269 struct xfrm_policy *xp;
3270 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3271 struct sadb_x_sec_ctx *sec_ctx;
3272
3273 switch (sk->sk_family) {
3274 case AF_INET:
3275 if (opt != IP_IPSEC_POLICY) {
3276 *dir = -EOPNOTSUPP;
3277 return NULL;
3278 }
3279 break;
3280 #if IS_ENABLED(CONFIG_IPV6)
3281 case AF_INET6:
3282 if (opt != IPV6_IPSEC_POLICY) {
3283 *dir = -EOPNOTSUPP;
3284 return NULL;
3285 }
3286 break;
3287 #endif
3288 default:
3289 *dir = -EINVAL;
3290 return NULL;
3291 }
3292
3293 *dir = -EINVAL;
3294
3295 if (len < sizeof(struct sadb_x_policy) ||
3296 pol->sadb_x_policy_len*8 > len ||
3297 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3298 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3299 return NULL;
3300
3301 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3302 if (xp == NULL) {
3303 *dir = -ENOBUFS;
3304 return NULL;
3305 }
3306
3307 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3308 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3309
3310 xp->lft.soft_byte_limit = XFRM_INF;
3311 xp->lft.hard_byte_limit = XFRM_INF;
3312 xp->lft.soft_packet_limit = XFRM_INF;
3313 xp->lft.hard_packet_limit = XFRM_INF;
3314 xp->family = sk->sk_family;
3315
3316 xp->xfrm_nr = 0;
3317 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3318 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3319 goto out;
3320
3321 /* security context too */
3322 if (len >= (pol->sadb_x_policy_len*8 +
3323 sizeof(struct sadb_x_sec_ctx))) {
3324 char *p = (char *)pol;
3325 struct xfrm_user_sec_ctx *uctx;
3326
3327 p += pol->sadb_x_policy_len*8;
3328 sec_ctx = (struct sadb_x_sec_ctx *)p;
3329 if (len < pol->sadb_x_policy_len*8 +
3330 sec_ctx->sadb_x_sec_len*8) {
3331 *dir = -EINVAL;
3332 goto out;
3333 }
3334 if ((*dir = verify_sec_ctx_len(p)))
3335 goto out;
3336 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3337 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3338 kfree(uctx);
3339
3340 if (*dir)
3341 goto out;
3342 }
3343
3344 *dir = pol->sadb_x_policy_dir-1;
3345 return xp;
3346
3347 out:
3348 xp->walk.dead = 1;
3349 xfrm_policy_destroy(xp);
3350 return NULL;
3351 }
3352
3353 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3354 {
3355 struct sk_buff *skb;
3356 struct sadb_msg *hdr;
3357 struct sadb_sa *sa;
3358 struct sadb_address *addr;
3359 struct sadb_x_nat_t_port *n_port;
3360 int sockaddr_size;
3361 int size;
3362 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3363 struct xfrm_encap_tmpl *natt = NULL;
3364
3365 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3366 if (!sockaddr_size)
3367 return -EINVAL;
3368
3369 if (!satype)
3370 return -EINVAL;
3371
3372 if (!x->encap)
3373 return -EINVAL;
3374
3375 natt = x->encap;
3376
3377 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3378 *
3379 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3380 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3381 */
3382
3383 size = sizeof(struct sadb_msg) +
3384 sizeof(struct sadb_sa) +
3385 (sizeof(struct sadb_address) * 2) +
3386 (sockaddr_size * 2) +
3387 (sizeof(struct sadb_x_nat_t_port) * 2);
3388
3389 skb = alloc_skb(size + 16, GFP_ATOMIC);
3390 if (skb == NULL)
3391 return -ENOMEM;
3392
3393 hdr = skb_put(skb, sizeof(struct sadb_msg));
3394 hdr->sadb_msg_version = PF_KEY_V2;
3395 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3396 hdr->sadb_msg_satype = satype;
3397 hdr->sadb_msg_len = size / sizeof(uint64_t);
3398 hdr->sadb_msg_errno = 0;
3399 hdr->sadb_msg_reserved = 0;
3400 hdr->sadb_msg_seq = x->km.seq;
3401 hdr->sadb_msg_pid = 0;
3402
3403 /* SA */
3404 sa = skb_put(skb, sizeof(struct sadb_sa));
3405 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3406 sa->sadb_sa_exttype = SADB_EXT_SA;
3407 sa->sadb_sa_spi = x->id.spi;
3408 sa->sadb_sa_replay = 0;
3409 sa->sadb_sa_state = 0;
3410 sa->sadb_sa_auth = 0;
3411 sa->sadb_sa_encrypt = 0;
3412 sa->sadb_sa_flags = 0;
3413
3414 /* ADDRESS_SRC (old addr) */
3415 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3416 addr->sadb_address_len =
3417 (sizeof(struct sadb_address)+sockaddr_size)/
3418 sizeof(uint64_t);
3419 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3420 addr->sadb_address_proto = 0;
3421 addr->sadb_address_reserved = 0;
3422 addr->sadb_address_prefixlen =
3423 pfkey_sockaddr_fill(&x->props.saddr, 0,
3424 (struct sockaddr *) (addr + 1),
3425 x->props.family);
3426 if (!addr->sadb_address_prefixlen)
3427 BUG();
3428
3429 /* NAT_T_SPORT (old port) */
3430 n_port = skb_put(skb, sizeof(*n_port));
3431 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3432 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3433 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3434 n_port->sadb_x_nat_t_port_reserved = 0;
3435
3436 /* ADDRESS_DST (new addr) */
3437 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3438 addr->sadb_address_len =
3439 (sizeof(struct sadb_address)+sockaddr_size)/
3440 sizeof(uint64_t);
3441 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3442 addr->sadb_address_proto = 0;
3443 addr->sadb_address_reserved = 0;
3444 addr->sadb_address_prefixlen =
3445 pfkey_sockaddr_fill(ipaddr, 0,
3446 (struct sockaddr *) (addr + 1),
3447 x->props.family);
3448 if (!addr->sadb_address_prefixlen)
3449 BUG();
3450
3451 /* NAT_T_DPORT (new port) */
3452 n_port = skb_put(skb, sizeof(*n_port));
3453 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3454 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3455 n_port->sadb_x_nat_t_port_port = sport;
3456 n_port->sadb_x_nat_t_port_reserved = 0;
3457
3458 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3459 xs_net(x));
3460 }
3461
3462 #ifdef CONFIG_NET_KEY_MIGRATE
3463 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3464 const struct xfrm_selector *sel)
3465 {
3466 struct sadb_address *addr;
3467 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3468 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3469 addr->sadb_address_exttype = type;
3470 addr->sadb_address_proto = sel->proto;
3471 addr->sadb_address_reserved = 0;
3472
3473 switch (type) {
3474 case SADB_EXT_ADDRESS_SRC:
3475 addr->sadb_address_prefixlen = sel->prefixlen_s;
3476 pfkey_sockaddr_fill(&sel->saddr, 0,
3477 (struct sockaddr *)(addr + 1),
3478 sel->family);
3479 break;
3480 case SADB_EXT_ADDRESS_DST:
3481 addr->sadb_address_prefixlen = sel->prefixlen_d;
3482 pfkey_sockaddr_fill(&sel->daddr, 0,
3483 (struct sockaddr *)(addr + 1),
3484 sel->family);
3485 break;
3486 default:
3487 return -EINVAL;
3488 }
3489
3490 return 0;
3491 }
3492
3493
3494 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3495 {
3496 struct sadb_x_kmaddress *kma;
3497 u8 *sa;
3498 int family = k->family;
3499 int socklen = pfkey_sockaddr_len(family);
3500 int size_req;
3501
3502 size_req = (sizeof(struct sadb_x_kmaddress) +
3503 pfkey_sockaddr_pair_size(family));
3504
3505 kma = skb_put_zero(skb, size_req);
3506 kma->sadb_x_kmaddress_len = size_req / 8;
3507 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3508 kma->sadb_x_kmaddress_reserved = k->reserved;
3509
3510 sa = (u8 *)(kma + 1);
3511 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3512 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3513 return -EINVAL;
3514
3515 return 0;
3516 }
3517
3518 static int set_ipsecrequest(struct sk_buff *skb,
3519 uint8_t proto, uint8_t mode, int level,
3520 uint32_t reqid, uint8_t family,
3521 const xfrm_address_t *src, const xfrm_address_t *dst)
3522 {
3523 struct sadb_x_ipsecrequest *rq;
3524 u8 *sa;
3525 int socklen = pfkey_sockaddr_len(family);
3526 int size_req;
3527
3528 size_req = sizeof(struct sadb_x_ipsecrequest) +
3529 pfkey_sockaddr_pair_size(family);
3530
3531 rq = skb_put_zero(skb, size_req);
3532 rq->sadb_x_ipsecrequest_len = size_req;
3533 rq->sadb_x_ipsecrequest_proto = proto;
3534 rq->sadb_x_ipsecrequest_mode = mode;
3535 rq->sadb_x_ipsecrequest_level = level;
3536 rq->sadb_x_ipsecrequest_reqid = reqid;
3537
3538 sa = (u8 *) (rq + 1);
3539 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3540 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3541 return -EINVAL;
3542
3543 return 0;
3544 }
3545 #endif
3546
3547 #ifdef CONFIG_NET_KEY_MIGRATE
3548 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3549 const struct xfrm_migrate *m, int num_bundles,
3550 const struct xfrm_kmaddress *k,
3551 const struct xfrm_encap_tmpl *encap)
3552 {
3553 int i;
3554 int sasize_sel;
3555 int size = 0;
3556 int size_pol = 0;
3557 struct sk_buff *skb;
3558 struct sadb_msg *hdr;
3559 struct sadb_x_policy *pol;
3560 const struct xfrm_migrate *mp;
3561
3562 if (type != XFRM_POLICY_TYPE_MAIN)
3563 return 0;
3564
3565 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3566 return -EINVAL;
3567
3568 if (k != NULL) {
3569 /* addresses for KM */
3570 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3571 pfkey_sockaddr_pair_size(k->family));
3572 }
3573
3574 /* selector */
3575 sasize_sel = pfkey_sockaddr_size(sel->family);
3576 if (!sasize_sel)
3577 return -EINVAL;
3578 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3579
3580 /* policy info */
3581 size_pol += sizeof(struct sadb_x_policy);
3582
3583 /* ipsecrequests */
3584 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3585 /* old locator pair */
3586 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3587 pfkey_sockaddr_pair_size(mp->old_family);
3588 /* new locator pair */
3589 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3590 pfkey_sockaddr_pair_size(mp->new_family);
3591 }
3592
3593 size += sizeof(struct sadb_msg) + size_pol;
3594
3595 /* alloc buffer */
3596 skb = alloc_skb(size, GFP_ATOMIC);
3597 if (skb == NULL)
3598 return -ENOMEM;
3599
3600 hdr = skb_put(skb, sizeof(struct sadb_msg));
3601 hdr->sadb_msg_version = PF_KEY_V2;
3602 hdr->sadb_msg_type = SADB_X_MIGRATE;
3603 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3604 hdr->sadb_msg_len = size / 8;
3605 hdr->sadb_msg_errno = 0;
3606 hdr->sadb_msg_reserved = 0;
3607 hdr->sadb_msg_seq = 0;
3608 hdr->sadb_msg_pid = 0;
3609
3610 /* Addresses to be used by KM for negotiation, if ext is available */
3611 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3612 goto err;
3613
3614 /* selector src */
3615 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3616
3617 /* selector dst */
3618 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3619
3620 /* policy information */
3621 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3622 pol->sadb_x_policy_len = size_pol / 8;
3623 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3624 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3625 pol->sadb_x_policy_dir = dir + 1;
3626 pol->sadb_x_policy_reserved = 0;
3627 pol->sadb_x_policy_id = 0;
3628 pol->sadb_x_policy_priority = 0;
3629
3630 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3631 /* old ipsecrequest */
3632 int mode = pfkey_mode_from_xfrm(mp->mode);
3633 if (mode < 0)
3634 goto err;
3635 if (set_ipsecrequest(skb, mp->proto, mode,
3636 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3637 mp->reqid, mp->old_family,
3638 &mp->old_saddr, &mp->old_daddr) < 0)
3639 goto err;
3640
3641 /* new ipsecrequest */
3642 if (set_ipsecrequest(skb, mp->proto, mode,
3643 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3644 mp->reqid, mp->new_family,
3645 &mp->new_saddr, &mp->new_daddr) < 0)
3646 goto err;
3647 }
3648
3649 /* broadcast migrate message to sockets */
3650 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3651
3652 return 0;
3653
3654 err:
3655 kfree_skb(skb);
3656 return -EINVAL;
3657 }
3658 #else
3659 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3660 const struct xfrm_migrate *m, int num_bundles,
3661 const struct xfrm_kmaddress *k,
3662 const struct xfrm_encap_tmpl *encap)
3663 {
3664 return -ENOPROTOOPT;
3665 }
3666 #endif
3667
3668 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3669 {
3670 struct sock *sk = sock->sk;
3671 struct sk_buff *skb = NULL;
3672 struct sadb_msg *hdr = NULL;
3673 int err;
3674 struct net *net = sock_net(sk);
3675
3676 err = -EOPNOTSUPP;
3677 if (msg->msg_flags & MSG_OOB)
3678 goto out;
3679
3680 err = -EMSGSIZE;
3681 if ((unsigned int)len > sk->sk_sndbuf - 32)
3682 goto out;
3683
3684 err = -ENOBUFS;
3685 skb = alloc_skb(len, GFP_KERNEL);
3686 if (skb == NULL)
3687 goto out;
3688
3689 err = -EFAULT;
3690 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3691 goto out;
3692
3693 hdr = pfkey_get_base_msg(skb, &err);
3694 if (!hdr)
3695 goto out;
3696
3697 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3698 err = pfkey_process(sk, skb, hdr);
3699 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3700
3701 out:
3702 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3703 err = 0;
3704 kfree_skb(skb);
3705
3706 return err ? : len;
3707 }
3708
3709 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3710 int flags)
3711 {
3712 struct sock *sk = sock->sk;
3713 struct pfkey_sock *pfk = pfkey_sk(sk);
3714 struct sk_buff *skb;
3715 int copied, err;
3716
3717 err = -EINVAL;
3718 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3719 goto out;
3720
3721 skb = skb_recv_datagram(sk, flags, &err);
3722 if (skb == NULL)
3723 goto out;
3724
3725 copied = skb->len;
3726 if (copied > len) {
3727 msg->msg_flags |= MSG_TRUNC;
3728 copied = len;
3729 }
3730
3731 skb_reset_transport_header(skb);
3732 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3733 if (err)
3734 goto out_free;
3735
3736 sock_recv_cmsgs(msg, sk, skb);
3737
3738 err = (flags & MSG_TRUNC) ? skb->len : copied;
3739
3740 if (pfk->dump.dump != NULL &&
3741 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3742 pfkey_do_dump(pfk);
3743
3744 out_free:
3745 skb_free_datagram(sk, skb);
3746 out:
3747 return err;
3748 }
3749
3750 static const struct proto_ops pfkey_ops = {
3751 .family = PF_KEY,
3752 .owner = THIS_MODULE,
3753 /* Operations that make no sense on pfkey sockets. */
3754 .bind = sock_no_bind,
3755 .connect = sock_no_connect,
3756 .socketpair = sock_no_socketpair,
3757 .accept = sock_no_accept,
3758 .getname = sock_no_getname,
3759 .ioctl = sock_no_ioctl,
3760 .listen = sock_no_listen,
3761 .shutdown = sock_no_shutdown,
3762 .mmap = sock_no_mmap,
3763
3764 /* Now the operations that really occur. */
3765 .release = pfkey_release,
3766 .poll = datagram_poll,
3767 .sendmsg = pfkey_sendmsg,
3768 .recvmsg = pfkey_recvmsg,
3769 };
3770
3771 static const struct net_proto_family pfkey_family_ops = {
3772 .family = PF_KEY,
3773 .create = pfkey_create,
3774 .owner = THIS_MODULE,
3775 };
3776
3777 #ifdef CONFIG_PROC_FS
3778 static int pfkey_seq_show(struct seq_file *f, void *v)
3779 {
3780 struct sock *s = sk_entry(v);
3781
3782 if (v == SEQ_START_TOKEN)
3783 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3784 else
3785 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3786 s,
3787 refcount_read(&s->sk_refcnt),
3788 sk_rmem_alloc_get(s),
3789 sk_wmem_alloc_get(s),
3790 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3791 sock_i_ino(s)
3792 );
3793 return 0;
3794 }
3795
3796 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3797 __acquires(rcu)
3798 {
3799 struct net *net = seq_file_net(f);
3800 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3801
3802 rcu_read_lock();
3803 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3804 }
3805
3806 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3807 {
3808 struct net *net = seq_file_net(f);
3809 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3810
3811 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3812 }
3813
3814 static void pfkey_seq_stop(struct seq_file *f, void *v)
3815 __releases(rcu)
3816 {
3817 rcu_read_unlock();
3818 }
3819
3820 static const struct seq_operations pfkey_seq_ops = {
3821 .start = pfkey_seq_start,
3822 .next = pfkey_seq_next,
3823 .stop = pfkey_seq_stop,
3824 .show = pfkey_seq_show,
3825 };
3826
3827 static int __net_init pfkey_init_proc(struct net *net)
3828 {
3829 struct proc_dir_entry *e;
3830
3831 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3832 sizeof(struct seq_net_private));
3833 if (e == NULL)
3834 return -ENOMEM;
3835
3836 return 0;
3837 }
3838
3839 static void __net_exit pfkey_exit_proc(struct net *net)
3840 {
3841 remove_proc_entry("pfkey", net->proc_net);
3842 }
3843 #else
3844 static inline int pfkey_init_proc(struct net *net)
3845 {
3846 return 0;
3847 }
3848
3849 static inline void pfkey_exit_proc(struct net *net)
3850 {
3851 }
3852 #endif
3853
3854 static struct xfrm_mgr pfkeyv2_mgr =
3855 {
3856 .notify = pfkey_send_notify,
3857 .acquire = pfkey_send_acquire,
3858 .compile_policy = pfkey_compile_policy,
3859 .new_mapping = pfkey_send_new_mapping,
3860 .notify_policy = pfkey_send_policy_notify,
3861 .migrate = pfkey_send_migrate,
3862 .is_alive = pfkey_is_alive,
3863 };
3864
3865 static int __net_init pfkey_net_init(struct net *net)
3866 {
3867 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3868 int rv;
3869
3870 INIT_HLIST_HEAD(&net_pfkey->table);
3871 atomic_set(&net_pfkey->socks_nr, 0);
3872
3873 rv = pfkey_init_proc(net);
3874
3875 return rv;
3876 }
3877
3878 static void __net_exit pfkey_net_exit(struct net *net)
3879 {
3880 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3881
3882 pfkey_exit_proc(net);
3883 WARN_ON(!hlist_empty(&net_pfkey->table));
3884 }
3885
3886 static struct pernet_operations pfkey_net_ops = {
3887 .init = pfkey_net_init,
3888 .exit = pfkey_net_exit,
3889 .id = &pfkey_net_id,
3890 .size = sizeof(struct netns_pfkey),
3891 };
3892
3893 static void __exit ipsec_pfkey_exit(void)
3894 {
3895 xfrm_unregister_km(&pfkeyv2_mgr);
3896 sock_unregister(PF_KEY);
3897 unregister_pernet_subsys(&pfkey_net_ops);
3898 proto_unregister(&key_proto);
3899 }
3900
3901 static int __init ipsec_pfkey_init(void)
3902 {
3903 int err = proto_register(&key_proto, 0);
3904
3905 if (err != 0)
3906 goto out;
3907
3908 err = register_pernet_subsys(&pfkey_net_ops);
3909 if (err != 0)
3910 goto out_unregister_key_proto;
3911 err = sock_register(&pfkey_family_ops);
3912 if (err != 0)
3913 goto out_unregister_pernet;
3914 xfrm_register_km(&pfkeyv2_mgr);
3915 out:
3916 return err;
3917
3918 out_unregister_pernet:
3919 unregister_pernet_subsys(&pfkey_net_ops);
3920 out_unregister_key_proto:
3921 proto_unregister(&key_proto);
3922 goto out;
3923 }
3924
3925 module_init(ipsec_pfkey_init);
3926 module_exit(ipsec_pfkey_exit);
3927 MODULE_DESCRIPTION("PF_KEY socket helpers");
3928 MODULE_LICENSE("GPL");
3929 MODULE_ALIAS_NETPROTO(PF_KEY);
3930
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