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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static unsigned int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 struct mutex dump_lock;
67 };
68
69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
70 xfrm_address_t *saddr, xfrm_address_t *daddr,
71 u16 *family);
72
73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
74 {
75 return (struct pfkey_sock *)sk;
76 }
77
78 static int pfkey_can_dump(const struct sock *sk)
79 {
80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
81 return 1;
82 return 0;
83 }
84
85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
86 {
87 if (pfk->dump.dump) {
88 if (pfk->dump.skb) {
89 kfree_skb(pfk->dump.skb);
90 pfk->dump.skb = NULL;
91 }
92 pfk->dump.done(pfk);
93 pfk->dump.dump = NULL;
94 pfk->dump.done = NULL;
95 }
96 }
97
98 static void pfkey_sock_destruct(struct sock *sk)
99 {
100 struct net *net = sock_net(sk);
101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
102
103 pfkey_terminate_dump(pfkey_sk(sk));
104 skb_queue_purge(&sk->sk_receive_queue);
105
106 if (!sock_flag(sk, SOCK_DEAD)) {
107 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
108 return;
109 }
110
111 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
112 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
113
114 atomic_dec(&net_pfkey->socks_nr);
115 }
116
117 static const struct proto_ops pfkey_ops;
118
119 static void pfkey_insert(struct sock *sk)
120 {
121 struct net *net = sock_net(sk);
122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
123
124 mutex_lock(&pfkey_mutex);
125 sk_add_node_rcu(sk, &net_pfkey->table);
126 mutex_unlock(&pfkey_mutex);
127 }
128
129 static void pfkey_remove(struct sock *sk)
130 {
131 mutex_lock(&pfkey_mutex);
132 sk_del_node_init_rcu(sk);
133 mutex_unlock(&pfkey_mutex);
134 }
135
136 static struct proto key_proto = {
137 .name = "KEY",
138 .owner = THIS_MODULE,
139 .obj_size = sizeof(struct pfkey_sock),
140 };
141
142 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
143 int kern)
144 {
145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
146 struct sock *sk;
147 struct pfkey_sock *pfk;
148 int err;
149
150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
151 return -EPERM;
152 if (sock->type != SOCK_RAW)
153 return -ESOCKTNOSUPPORT;
154 if (protocol != PF_KEY_V2)
155 return -EPROTONOSUPPORT;
156
157 err = -ENOMEM;
158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
159 if (sk == NULL)
160 goto out;
161
162 pfk = pfkey_sk(sk);
163 mutex_init(&pfk->dump_lock);
164
165 sock->ops = &pfkey_ops;
166 sock_init_data(sock, sk);
167
168 sk->sk_family = PF_KEY;
169 sk->sk_destruct = pfkey_sock_destruct;
170
171 atomic_inc(&net_pfkey->socks_nr);
172
173 pfkey_insert(sk);
174
175 return 0;
176 out:
177 return err;
178 }
179
180 static int pfkey_release(struct socket *sock)
181 {
182 struct sock *sk = sock->sk;
183
184 if (!sk)
185 return 0;
186
187 pfkey_remove(sk);
188
189 sock_orphan(sk);
190 sock->sk = NULL;
191 skb_queue_purge(&sk->sk_write_queue);
192
193 synchronize_rcu();
194 sock_put(sk);
195
196 return 0;
197 }
198
199 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
200 gfp_t allocation, struct sock *sk)
201 {
202 int err = -ENOBUFS;
203
204 sock_hold(sk);
205 if (*skb2 == NULL) {
206 if (atomic_read(&skb->users) != 1) {
207 *skb2 = skb_clone(skb, allocation);
208 } else {
209 *skb2 = skb;
210 atomic_inc(&skb->users);
211 }
212 }
213 if (*skb2 != NULL) {
214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
215 skb_set_owner_r(*skb2, sk);
216 skb_queue_tail(&sk->sk_receive_queue, *skb2);
217 sk->sk_data_ready(sk);
218 *skb2 = NULL;
219 err = 0;
220 }
221 }
222 sock_put(sk);
223 return err;
224 }
225
226 /* Send SKB to all pfkey sockets matching selected criteria. */
227 #define BROADCAST_ALL 0
228 #define BROADCAST_ONE 1
229 #define BROADCAST_REGISTERED 2
230 #define BROADCAST_PROMISC_ONLY 4
231 static int pfkey_broadcast(struct sk_buff *skb,
232 int broadcast_flags, struct sock *one_sk,
233 struct net *net)
234 {
235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
236 struct sock *sk;
237 struct sk_buff *skb2 = NULL;
238 int err = -ESRCH;
239
240 /* XXX Do we need something like netlink_overrun? I think
241 * XXX PF_KEY socket apps will not mind current behavior.
242 */
243 if (!skb)
244 return -ENOMEM;
245
246 rcu_read_lock();
247 sk_for_each_rcu(sk, &net_pfkey->table) {
248 struct pfkey_sock *pfk = pfkey_sk(sk);
249 int err2;
250
251 /* Yes, it means that if you are meant to receive this
252 * pfkey message you receive it twice as promiscuous
253 * socket.
254 */
255 if (pfk->promisc)
256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
257
258 /* the exact target will be processed later */
259 if (sk == one_sk)
260 continue;
261 if (broadcast_flags != BROADCAST_ALL) {
262 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
263 continue;
264 if ((broadcast_flags & BROADCAST_REGISTERED) &&
265 !pfk->registered)
266 continue;
267 if (broadcast_flags & BROADCAST_ONE)
268 continue;
269 }
270
271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
272
273 /* Error is cleared after successful sending to at least one
274 * registered KM */
275 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
276 err = err2;
277 }
278 rcu_read_unlock();
279
280 if (one_sk != NULL)
281 err = pfkey_broadcast_one(skb, &skb2, GFP_KERNEL, one_sk);
282
283 kfree_skb(skb2);
284 kfree_skb(skb);
285 return err;
286 }
287
288 static int pfkey_do_dump(struct pfkey_sock *pfk)
289 {
290 struct sadb_msg *hdr;
291 int rc;
292
293 mutex_lock(&pfk->dump_lock);
294 if (!pfk->dump.dump) {
295 rc = 0;
296 goto out;
297 }
298
299 rc = pfk->dump.dump(pfk);
300 if (rc == -ENOBUFS) {
301 rc = 0;
302 goto out;
303 }
304
305 if (pfk->dump.skb) {
306 if (!pfkey_can_dump(&pfk->sk)) {
307 rc = 0;
308 goto out;
309 }
310
311 hdr = (struct sadb_msg *) pfk->dump.skb->data;
312 hdr->sadb_msg_seq = 0;
313 hdr->sadb_msg_errno = rc;
314 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
315 &pfk->sk, sock_net(&pfk->sk));
316 pfk->dump.skb = NULL;
317 }
318
319 pfkey_terminate_dump(pfk);
320
321 out:
322 mutex_unlock(&pfk->dump_lock);
323 return rc;
324 }
325
326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
327 const struct sadb_msg *orig)
328 {
329 *new = *orig;
330 }
331
332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
333 {
334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
335 struct sadb_msg *hdr;
336
337 if (!skb)
338 return -ENOBUFS;
339
340 /* Woe be to the platform trying to support PFKEY yet
341 * having normal errnos outside the 1-255 range, inclusive.
342 */
343 err = -err;
344 if (err == ERESTARTSYS ||
345 err == ERESTARTNOHAND ||
346 err == ERESTARTNOINTR)
347 err = EINTR;
348 if (err >= 512)
349 err = EINVAL;
350 BUG_ON(err <= 0 || err >= 256);
351
352 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
353 pfkey_hdr_dup(hdr, orig);
354 hdr->sadb_msg_errno = (uint8_t) err;
355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
356 sizeof(uint64_t));
357
358 pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
359
360 return 0;
361 }
362
363 static const u8 sadb_ext_min_len[] = {
364 [SADB_EXT_RESERVED] = (u8) 0,
365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
391 };
392
393 /* Verify sadb_address_{len,prefixlen} against sa_family. */
394 static int verify_address_len(const void *p)
395 {
396 const struct sadb_address *sp = p;
397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
398 const struct sockaddr_in *sin;
399 #if IS_ENABLED(CONFIG_IPV6)
400 const struct sockaddr_in6 *sin6;
401 #endif
402 int len;
403
404 switch (addr->sa_family) {
405 case AF_INET:
406 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
407 if (sp->sadb_address_len != len ||
408 sp->sadb_address_prefixlen > 32)
409 return -EINVAL;
410 break;
411 #if IS_ENABLED(CONFIG_IPV6)
412 case AF_INET6:
413 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
414 if (sp->sadb_address_len != len ||
415 sp->sadb_address_prefixlen > 128)
416 return -EINVAL;
417 break;
418 #endif
419 default:
420 /* It is user using kernel to keep track of security
421 * associations for another protocol, such as
422 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
423 * lengths.
424 *
425 * XXX Actually, association/policy database is not yet
426 * XXX able to cope with arbitrary sockaddr families.
427 * XXX When it can, remove this -EINVAL. -DaveM
428 */
429 return -EINVAL;
430 }
431
432 return 0;
433 }
434
435 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
436 {
437 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
438 sec_ctx->sadb_x_ctx_len,
439 sizeof(uint64_t));
440 }
441
442 static inline int verify_sec_ctx_len(const void *p)
443 {
444 const struct sadb_x_sec_ctx *sec_ctx = p;
445 int len = sec_ctx->sadb_x_ctx_len;
446
447 if (len > PAGE_SIZE)
448 return -EINVAL;
449
450 len = pfkey_sec_ctx_len(sec_ctx);
451
452 if (sec_ctx->sadb_x_sec_len != len)
453 return -EINVAL;
454
455 return 0;
456 }
457
458 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
459 gfp_t gfp)
460 {
461 struct xfrm_user_sec_ctx *uctx = NULL;
462 int ctx_size = sec_ctx->sadb_x_ctx_len;
463
464 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
465
466 if (!uctx)
467 return NULL;
468
469 uctx->len = pfkey_sec_ctx_len(sec_ctx);
470 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
471 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
472 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
473 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
474 memcpy(uctx + 1, sec_ctx + 1,
475 uctx->ctx_len);
476
477 return uctx;
478 }
479
480 static int present_and_same_family(const struct sadb_address *src,
481 const struct sadb_address *dst)
482 {
483 const struct sockaddr *s_addr, *d_addr;
484
485 if (!src || !dst)
486 return 0;
487
488 s_addr = (const struct sockaddr *)(src + 1);
489 d_addr = (const struct sockaddr *)(dst + 1);
490 if (s_addr->sa_family != d_addr->sa_family)
491 return 0;
492 if (s_addr->sa_family != AF_INET
493 #if IS_ENABLED(CONFIG_IPV6)
494 && s_addr->sa_family != AF_INET6
495 #endif
496 )
497 return 0;
498
499 return 1;
500 }
501
502 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
503 {
504 const char *p = (char *) hdr;
505 int len = skb->len;
506
507 len -= sizeof(*hdr);
508 p += sizeof(*hdr);
509 while (len > 0) {
510 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
511 uint16_t ext_type;
512 int ext_len;
513
514 ext_len = ehdr->sadb_ext_len;
515 ext_len *= sizeof(uint64_t);
516 ext_type = ehdr->sadb_ext_type;
517 if (ext_len < sizeof(uint64_t) ||
518 ext_len > len ||
519 ext_type == SADB_EXT_RESERVED)
520 return -EINVAL;
521
522 if (ext_type <= SADB_EXT_MAX) {
523 int min = (int) sadb_ext_min_len[ext_type];
524 if (ext_len < min)
525 return -EINVAL;
526 if (ext_hdrs[ext_type-1] != NULL)
527 return -EINVAL;
528 if (ext_type == SADB_EXT_ADDRESS_SRC ||
529 ext_type == SADB_EXT_ADDRESS_DST ||
530 ext_type == SADB_EXT_ADDRESS_PROXY ||
531 ext_type == SADB_X_EXT_NAT_T_OA) {
532 if (verify_address_len(p))
533 return -EINVAL;
534 }
535 if (ext_type == SADB_X_EXT_SEC_CTX) {
536 if (verify_sec_ctx_len(p))
537 return -EINVAL;
538 }
539 ext_hdrs[ext_type-1] = (void *) p;
540 }
541 p += ext_len;
542 len -= ext_len;
543 }
544
545 return 0;
546 }
547
548 static uint16_t
549 pfkey_satype2proto(uint8_t satype)
550 {
551 switch (satype) {
552 case SADB_SATYPE_UNSPEC:
553 return IPSEC_PROTO_ANY;
554 case SADB_SATYPE_AH:
555 return IPPROTO_AH;
556 case SADB_SATYPE_ESP:
557 return IPPROTO_ESP;
558 case SADB_X_SATYPE_IPCOMP:
559 return IPPROTO_COMP;
560 default:
561 return 0;
562 }
563 /* NOTREACHED */
564 }
565
566 static uint8_t
567 pfkey_proto2satype(uint16_t proto)
568 {
569 switch (proto) {
570 case IPPROTO_AH:
571 return SADB_SATYPE_AH;
572 case IPPROTO_ESP:
573 return SADB_SATYPE_ESP;
574 case IPPROTO_COMP:
575 return SADB_X_SATYPE_IPCOMP;
576 default:
577 return 0;
578 }
579 /* NOTREACHED */
580 }
581
582 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
583 * say specifically 'just raw sockets' as we encode them as 255.
584 */
585
586 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
587 {
588 return proto == IPSEC_PROTO_ANY ? 0 : proto;
589 }
590
591 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
592 {
593 return proto ? proto : IPSEC_PROTO_ANY;
594 }
595
596 static inline int pfkey_sockaddr_len(sa_family_t family)
597 {
598 switch (family) {
599 case AF_INET:
600 return sizeof(struct sockaddr_in);
601 #if IS_ENABLED(CONFIG_IPV6)
602 case AF_INET6:
603 return sizeof(struct sockaddr_in6);
604 #endif
605 }
606 return 0;
607 }
608
609 static
610 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
611 {
612 switch (sa->sa_family) {
613 case AF_INET:
614 xaddr->a4 =
615 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
616 return AF_INET;
617 #if IS_ENABLED(CONFIG_IPV6)
618 case AF_INET6:
619 memcpy(xaddr->a6,
620 &((struct sockaddr_in6 *)sa)->sin6_addr,
621 sizeof(struct in6_addr));
622 return AF_INET6;
623 #endif
624 }
625 return 0;
626 }
627
628 static
629 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
630 {
631 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
632 xaddr);
633 }
634
635 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
636 {
637 const struct sadb_sa *sa;
638 const struct sadb_address *addr;
639 uint16_t proto;
640 unsigned short family;
641 xfrm_address_t *xaddr;
642
643 sa = ext_hdrs[SADB_EXT_SA - 1];
644 if (sa == NULL)
645 return NULL;
646
647 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
648 if (proto == 0)
649 return NULL;
650
651 /* sadb_address_len should be checked by caller */
652 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
653 if (addr == NULL)
654 return NULL;
655
656 family = ((const struct sockaddr *)(addr + 1))->sa_family;
657 switch (family) {
658 case AF_INET:
659 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
660 break;
661 #if IS_ENABLED(CONFIG_IPV6)
662 case AF_INET6:
663 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
664 break;
665 #endif
666 default:
667 xaddr = NULL;
668 }
669
670 if (!xaddr)
671 return NULL;
672
673 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
674 }
675
676 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
677
678 static int
679 pfkey_sockaddr_size(sa_family_t family)
680 {
681 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
682 }
683
684 static inline int pfkey_mode_from_xfrm(int mode)
685 {
686 switch(mode) {
687 case XFRM_MODE_TRANSPORT:
688 return IPSEC_MODE_TRANSPORT;
689 case XFRM_MODE_TUNNEL:
690 return IPSEC_MODE_TUNNEL;
691 case XFRM_MODE_BEET:
692 return IPSEC_MODE_BEET;
693 default:
694 return -1;
695 }
696 }
697
698 static inline int pfkey_mode_to_xfrm(int mode)
699 {
700 switch(mode) {
701 case IPSEC_MODE_ANY: /*XXX*/
702 case IPSEC_MODE_TRANSPORT:
703 return XFRM_MODE_TRANSPORT;
704 case IPSEC_MODE_TUNNEL:
705 return XFRM_MODE_TUNNEL;
706 case IPSEC_MODE_BEET:
707 return XFRM_MODE_BEET;
708 default:
709 return -1;
710 }
711 }
712
713 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
714 struct sockaddr *sa,
715 unsigned short family)
716 {
717 switch (family) {
718 case AF_INET:
719 {
720 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
721 sin->sin_family = AF_INET;
722 sin->sin_port = port;
723 sin->sin_addr.s_addr = xaddr->a4;
724 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
725 return 32;
726 }
727 #if IS_ENABLED(CONFIG_IPV6)
728 case AF_INET6:
729 {
730 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
731 sin6->sin6_family = AF_INET6;
732 sin6->sin6_port = port;
733 sin6->sin6_flowinfo = 0;
734 sin6->sin6_addr = xaddr->in6;
735 sin6->sin6_scope_id = 0;
736 return 128;
737 }
738 #endif
739 }
740 return 0;
741 }
742
743 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
744 int add_keys, int hsc)
745 {
746 struct sk_buff *skb;
747 struct sadb_msg *hdr;
748 struct sadb_sa *sa;
749 struct sadb_lifetime *lifetime;
750 struct sadb_address *addr;
751 struct sadb_key *key;
752 struct sadb_x_sa2 *sa2;
753 struct sadb_x_sec_ctx *sec_ctx;
754 struct xfrm_sec_ctx *xfrm_ctx;
755 int ctx_size = 0;
756 int size;
757 int auth_key_size = 0;
758 int encrypt_key_size = 0;
759 int sockaddr_size;
760 struct xfrm_encap_tmpl *natt = NULL;
761 int mode;
762
763 /* address family check */
764 sockaddr_size = pfkey_sockaddr_size(x->props.family);
765 if (!sockaddr_size)
766 return ERR_PTR(-EINVAL);
767
768 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
769 key(AE), (identity(SD),) (sensitivity)> */
770 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
771 sizeof(struct sadb_lifetime) +
772 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
773 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
774 sizeof(struct sadb_address)*2 +
775 sockaddr_size*2 +
776 sizeof(struct sadb_x_sa2);
777
778 if ((xfrm_ctx = x->security)) {
779 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
780 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
781 }
782
783 /* identity & sensitivity */
784 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
785 size += sizeof(struct sadb_address) + sockaddr_size;
786
787 if (add_keys) {
788 if (x->aalg && x->aalg->alg_key_len) {
789 auth_key_size =
790 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
791 size += sizeof(struct sadb_key) + auth_key_size;
792 }
793 if (x->ealg && x->ealg->alg_key_len) {
794 encrypt_key_size =
795 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
796 size += sizeof(struct sadb_key) + encrypt_key_size;
797 }
798 }
799 if (x->encap)
800 natt = x->encap;
801
802 if (natt && natt->encap_type) {
803 size += sizeof(struct sadb_x_nat_t_type);
804 size += sizeof(struct sadb_x_nat_t_port);
805 size += sizeof(struct sadb_x_nat_t_port);
806 }
807
808 skb = alloc_skb(size + 16, GFP_ATOMIC);
809 if (skb == NULL)
810 return ERR_PTR(-ENOBUFS);
811
812 /* call should fill header later */
813 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
814 memset(hdr, 0, size); /* XXX do we need this ? */
815 hdr->sadb_msg_len = size / sizeof(uint64_t);
816
817 /* sa */
818 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
819 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
820 sa->sadb_sa_exttype = SADB_EXT_SA;
821 sa->sadb_sa_spi = x->id.spi;
822 sa->sadb_sa_replay = x->props.replay_window;
823 switch (x->km.state) {
824 case XFRM_STATE_VALID:
825 sa->sadb_sa_state = x->km.dying ?
826 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
827 break;
828 case XFRM_STATE_ACQ:
829 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
830 break;
831 default:
832 sa->sadb_sa_state = SADB_SASTATE_DEAD;
833 break;
834 }
835 sa->sadb_sa_auth = 0;
836 if (x->aalg) {
837 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
838 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
839 a->desc.sadb_alg_id : 0;
840 }
841 sa->sadb_sa_encrypt = 0;
842 BUG_ON(x->ealg && x->calg);
843 if (x->ealg) {
844 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
845 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
846 a->desc.sadb_alg_id : 0;
847 }
848 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
849 if (x->calg) {
850 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
851 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
852 a->desc.sadb_alg_id : 0;
853 }
854
855 sa->sadb_sa_flags = 0;
856 if (x->props.flags & XFRM_STATE_NOECN)
857 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
858 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
859 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
860 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
861 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
862
863 /* hard time */
864 if (hsc & 2) {
865 lifetime = (struct sadb_lifetime *) skb_put(skb,
866 sizeof(struct sadb_lifetime));
867 lifetime->sadb_lifetime_len =
868 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
869 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
870 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
871 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
872 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
873 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
874 }
875 /* soft time */
876 if (hsc & 1) {
877 lifetime = (struct sadb_lifetime *) skb_put(skb,
878 sizeof(struct sadb_lifetime));
879 lifetime->sadb_lifetime_len =
880 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
881 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
882 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
883 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
884 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
885 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
886 }
887 /* current time */
888 lifetime = (struct sadb_lifetime *) skb_put(skb,
889 sizeof(struct sadb_lifetime));
890 lifetime->sadb_lifetime_len =
891 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
892 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
893 lifetime->sadb_lifetime_allocations = x->curlft.packets;
894 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
895 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
896 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
897 /* src address */
898 addr = (struct sadb_address*) skb_put(skb,
899 sizeof(struct sadb_address)+sockaddr_size);
900 addr->sadb_address_len =
901 (sizeof(struct sadb_address)+sockaddr_size)/
902 sizeof(uint64_t);
903 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
904 /* "if the ports are non-zero, then the sadb_address_proto field,
905 normally zero, MUST be filled in with the transport
906 protocol's number." - RFC2367 */
907 addr->sadb_address_proto = 0;
908 addr->sadb_address_reserved = 0;
909
910 addr->sadb_address_prefixlen =
911 pfkey_sockaddr_fill(&x->props.saddr, 0,
912 (struct sockaddr *) (addr + 1),
913 x->props.family);
914 if (!addr->sadb_address_prefixlen)
915 BUG();
916
917 /* dst address */
918 addr = (struct sadb_address*) skb_put(skb,
919 sizeof(struct sadb_address)+sockaddr_size);
920 addr->sadb_address_len =
921 (sizeof(struct sadb_address)+sockaddr_size)/
922 sizeof(uint64_t);
923 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
924 addr->sadb_address_proto = 0;
925 addr->sadb_address_reserved = 0;
926
927 addr->sadb_address_prefixlen =
928 pfkey_sockaddr_fill(&x->id.daddr, 0,
929 (struct sockaddr *) (addr + 1),
930 x->props.family);
931 if (!addr->sadb_address_prefixlen)
932 BUG();
933
934 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
935 x->props.family)) {
936 addr = (struct sadb_address*) skb_put(skb,
937 sizeof(struct sadb_address)+sockaddr_size);
938 addr->sadb_address_len =
939 (sizeof(struct sadb_address)+sockaddr_size)/
940 sizeof(uint64_t);
941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
942 addr->sadb_address_proto =
943 pfkey_proto_from_xfrm(x->sel.proto);
944 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
945 addr->sadb_address_reserved = 0;
946
947 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
948 (struct sockaddr *) (addr + 1),
949 x->props.family);
950 }
951
952 /* auth key */
953 if (add_keys && auth_key_size) {
954 key = (struct sadb_key *) skb_put(skb,
955 sizeof(struct sadb_key)+auth_key_size);
956 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
957 sizeof(uint64_t);
958 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
959 key->sadb_key_bits = x->aalg->alg_key_len;
960 key->sadb_key_reserved = 0;
961 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
962 }
963 /* encrypt key */
964 if (add_keys && encrypt_key_size) {
965 key = (struct sadb_key *) skb_put(skb,
966 sizeof(struct sadb_key)+encrypt_key_size);
967 key->sadb_key_len = (sizeof(struct sadb_key) +
968 encrypt_key_size) / sizeof(uint64_t);
969 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
970 key->sadb_key_bits = x->ealg->alg_key_len;
971 key->sadb_key_reserved = 0;
972 memcpy(key + 1, x->ealg->alg_key,
973 (x->ealg->alg_key_len+7)/8);
974 }
975
976 /* sa */
977 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
978 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
979 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
980 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
981 kfree_skb(skb);
982 return ERR_PTR(-EINVAL);
983 }
984 sa2->sadb_x_sa2_mode = mode;
985 sa2->sadb_x_sa2_reserved1 = 0;
986 sa2->sadb_x_sa2_reserved2 = 0;
987 sa2->sadb_x_sa2_sequence = 0;
988 sa2->sadb_x_sa2_reqid = x->props.reqid;
989
990 if (natt && natt->encap_type) {
991 struct sadb_x_nat_t_type *n_type;
992 struct sadb_x_nat_t_port *n_port;
993
994 /* type */
995 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
996 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
997 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
998 n_type->sadb_x_nat_t_type_type = natt->encap_type;
999 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1000 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1001 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1002
1003 /* source port */
1004 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1005 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1006 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1007 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1008 n_port->sadb_x_nat_t_port_reserved = 0;
1009
1010 /* dest port */
1011 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1012 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1013 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1014 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1015 n_port->sadb_x_nat_t_port_reserved = 0;
1016 }
1017
1018 /* security context */
1019 if (xfrm_ctx) {
1020 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1021 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1022 sec_ctx->sadb_x_sec_len =
1023 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1024 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1025 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1026 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1027 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1028 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1029 xfrm_ctx->ctx_len);
1030 }
1031
1032 return skb;
1033 }
1034
1035
1036 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1037 {
1038 struct sk_buff *skb;
1039
1040 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1041
1042 return skb;
1043 }
1044
1045 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1046 int hsc)
1047 {
1048 return __pfkey_xfrm_state2msg(x, 0, hsc);
1049 }
1050
1051 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1052 const struct sadb_msg *hdr,
1053 void * const *ext_hdrs)
1054 {
1055 struct xfrm_state *x;
1056 const struct sadb_lifetime *lifetime;
1057 const struct sadb_sa *sa;
1058 const struct sadb_key *key;
1059 const struct sadb_x_sec_ctx *sec_ctx;
1060 uint16_t proto;
1061 int err;
1062
1063
1064 sa = ext_hdrs[SADB_EXT_SA - 1];
1065 if (!sa ||
1066 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1067 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1068 return ERR_PTR(-EINVAL);
1069 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1070 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1071 return ERR_PTR(-EINVAL);
1072 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1073 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1074 return ERR_PTR(-EINVAL);
1075 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1076 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1077 return ERR_PTR(-EINVAL);
1078
1079 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1080 if (proto == 0)
1081 return ERR_PTR(-EINVAL);
1082
1083 /* default error is no buffer space */
1084 err = -ENOBUFS;
1085
1086 /* RFC2367:
1087
1088 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1089 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1090 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1091 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1092 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1093 not true.
1094
1095 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1096 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1097 */
1098 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1099 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1100 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1101 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1102 return ERR_PTR(-EINVAL);
1103 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1104 if (key != NULL &&
1105 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1106 ((key->sadb_key_bits+7) / 8 == 0 ||
1107 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1108 return ERR_PTR(-EINVAL);
1109 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1110 if (key != NULL &&
1111 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1112 ((key->sadb_key_bits+7) / 8 == 0 ||
1113 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1114 return ERR_PTR(-EINVAL);
1115
1116 x = xfrm_state_alloc(net);
1117 if (x == NULL)
1118 return ERR_PTR(-ENOBUFS);
1119
1120 x->id.proto = proto;
1121 x->id.spi = sa->sadb_sa_spi;
1122 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1123 (sizeof(x->replay.bitmap) * 8));
1124 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1125 x->props.flags |= XFRM_STATE_NOECN;
1126 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1127 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1128 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1129 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1130
1131 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1132 if (lifetime != NULL) {
1133 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1134 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1135 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1136 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1137 }
1138 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1139 if (lifetime != NULL) {
1140 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1141 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1142 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1143 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1144 }
1145
1146 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1147 if (sec_ctx != NULL) {
1148 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1149
1150 if (!uctx)
1151 goto out;
1152
1153 err = security_xfrm_state_alloc(x, uctx);
1154 kfree(uctx);
1155
1156 if (err)
1157 goto out;
1158 }
1159
1160 err = -ENOBUFS;
1161 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1162 if (sa->sadb_sa_auth) {
1163 int keysize = 0;
1164 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1165 if (!a || !a->pfkey_supported) {
1166 err = -ENOSYS;
1167 goto out;
1168 }
1169 if (key)
1170 keysize = (key->sadb_key_bits + 7) / 8;
1171 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1172 if (!x->aalg) {
1173 err = -ENOMEM;
1174 goto out;
1175 }
1176 strcpy(x->aalg->alg_name, a->name);
1177 x->aalg->alg_key_len = 0;
1178 if (key) {
1179 x->aalg->alg_key_len = key->sadb_key_bits;
1180 memcpy(x->aalg->alg_key, key+1, keysize);
1181 }
1182 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1183 x->props.aalgo = sa->sadb_sa_auth;
1184 /* x->algo.flags = sa->sadb_sa_flags; */
1185 }
1186 if (sa->sadb_sa_encrypt) {
1187 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1188 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1189 if (!a || !a->pfkey_supported) {
1190 err = -ENOSYS;
1191 goto out;
1192 }
1193 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1194 if (!x->calg) {
1195 err = -ENOMEM;
1196 goto out;
1197 }
1198 strcpy(x->calg->alg_name, a->name);
1199 x->props.calgo = sa->sadb_sa_encrypt;
1200 } else {
1201 int keysize = 0;
1202 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1203 if (!a || !a->pfkey_supported) {
1204 err = -ENOSYS;
1205 goto out;
1206 }
1207 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1208 if (key)
1209 keysize = (key->sadb_key_bits + 7) / 8;
1210 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1211 if (!x->ealg) {
1212 err = -ENOMEM;
1213 goto out;
1214 }
1215 strcpy(x->ealg->alg_name, a->name);
1216 x->ealg->alg_key_len = 0;
1217 if (key) {
1218 x->ealg->alg_key_len = key->sadb_key_bits;
1219 memcpy(x->ealg->alg_key, key+1, keysize);
1220 }
1221 x->props.ealgo = sa->sadb_sa_encrypt;
1222 x->geniv = a->uinfo.encr.geniv;
1223 }
1224 }
1225 /* x->algo.flags = sa->sadb_sa_flags; */
1226
1227 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1228 &x->props.saddr);
1229 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1230 &x->id.daddr);
1231
1232 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1233 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1234 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1235 if (mode < 0) {
1236 err = -EINVAL;
1237 goto out;
1238 }
1239 x->props.mode = mode;
1240 x->props.reqid = sa2->sadb_x_sa2_reqid;
1241 }
1242
1243 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1244 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1245
1246 /* Nobody uses this, but we try. */
1247 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1248 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1249 }
1250
1251 if (!x->sel.family)
1252 x->sel.family = x->props.family;
1253
1254 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1255 const struct sadb_x_nat_t_type* n_type;
1256 struct xfrm_encap_tmpl *natt;
1257
1258 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1259 if (!x->encap) {
1260 err = -ENOMEM;
1261 goto out;
1262 }
1263
1264 natt = x->encap;
1265 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1266 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1267
1268 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1269 const struct sadb_x_nat_t_port *n_port =
1270 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1271 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1272 }
1273 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1274 const struct sadb_x_nat_t_port *n_port =
1275 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1276 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1277 }
1278 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1279 }
1280
1281 err = xfrm_init_state(x);
1282 if (err)
1283 goto out;
1284
1285 x->km.seq = hdr->sadb_msg_seq;
1286 return x;
1287
1288 out:
1289 x->km.state = XFRM_STATE_DEAD;
1290 xfrm_state_put(x);
1291 return ERR_PTR(err);
1292 }
1293
1294 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1295 {
1296 return -EOPNOTSUPP;
1297 }
1298
1299 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1300 {
1301 struct net *net = sock_net(sk);
1302 struct sk_buff *resp_skb;
1303 struct sadb_x_sa2 *sa2;
1304 struct sadb_address *saddr, *daddr;
1305 struct sadb_msg *out_hdr;
1306 struct sadb_spirange *range;
1307 struct xfrm_state *x = NULL;
1308 int mode;
1309 int err;
1310 u32 min_spi, max_spi;
1311 u32 reqid;
1312 u8 proto;
1313 unsigned short family;
1314 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1315
1316 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1317 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1318 return -EINVAL;
1319
1320 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1321 if (proto == 0)
1322 return -EINVAL;
1323
1324 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1325 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1326 if (mode < 0)
1327 return -EINVAL;
1328 reqid = sa2->sadb_x_sa2_reqid;
1329 } else {
1330 mode = 0;
1331 reqid = 0;
1332 }
1333
1334 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1335 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1336
1337 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1338 switch (family) {
1339 case AF_INET:
1340 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1341 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1342 break;
1343 #if IS_ENABLED(CONFIG_IPV6)
1344 case AF_INET6:
1345 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1346 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1347 break;
1348 #endif
1349 }
1350
1351 if (hdr->sadb_msg_seq) {
1352 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1353 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1354 xfrm_state_put(x);
1355 x = NULL;
1356 }
1357 }
1358
1359 if (!x)
1360 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1361
1362 if (x == NULL)
1363 return -ENOENT;
1364
1365 min_spi = 0x100;
1366 max_spi = 0x0fffffff;
1367
1368 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1369 if (range) {
1370 min_spi = range->sadb_spirange_min;
1371 max_spi = range->sadb_spirange_max;
1372 }
1373
1374 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1375 if (err) {
1376 xfrm_state_put(x);
1377 return err;
1378 }
1379
1380 err = xfrm_alloc_spi(x, min_spi, max_spi);
1381 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1382
1383 if (IS_ERR(resp_skb)) {
1384 xfrm_state_put(x);
1385 return PTR_ERR(resp_skb);
1386 }
1387
1388 out_hdr = (struct sadb_msg *) resp_skb->data;
1389 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1390 out_hdr->sadb_msg_type = SADB_GETSPI;
1391 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1392 out_hdr->sadb_msg_errno = 0;
1393 out_hdr->sadb_msg_reserved = 0;
1394 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1395 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1396
1397 xfrm_state_put(x);
1398
1399 pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1400
1401 return 0;
1402 }
1403
1404 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1405 {
1406 struct net *net = sock_net(sk);
1407 struct xfrm_state *x;
1408
1409 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1410 return -EOPNOTSUPP;
1411
1412 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1413 return 0;
1414
1415 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1416 if (x == NULL)
1417 return 0;
1418
1419 spin_lock_bh(&x->lock);
1420 if (x->km.state == XFRM_STATE_ACQ)
1421 x->km.state = XFRM_STATE_ERROR;
1422
1423 spin_unlock_bh(&x->lock);
1424 xfrm_state_put(x);
1425 return 0;
1426 }
1427
1428 static inline int event2poltype(int event)
1429 {
1430 switch (event) {
1431 case XFRM_MSG_DELPOLICY:
1432 return SADB_X_SPDDELETE;
1433 case XFRM_MSG_NEWPOLICY:
1434 return SADB_X_SPDADD;
1435 case XFRM_MSG_UPDPOLICY:
1436 return SADB_X_SPDUPDATE;
1437 case XFRM_MSG_POLEXPIRE:
1438 // return SADB_X_SPDEXPIRE;
1439 default:
1440 pr_err("pfkey: Unknown policy event %d\n", event);
1441 break;
1442 }
1443
1444 return 0;
1445 }
1446
1447 static inline int event2keytype(int event)
1448 {
1449 switch (event) {
1450 case XFRM_MSG_DELSA:
1451 return SADB_DELETE;
1452 case XFRM_MSG_NEWSA:
1453 return SADB_ADD;
1454 case XFRM_MSG_UPDSA:
1455 return SADB_UPDATE;
1456 case XFRM_MSG_EXPIRE:
1457 return SADB_EXPIRE;
1458 default:
1459 pr_err("pfkey: Unknown SA event %d\n", event);
1460 break;
1461 }
1462
1463 return 0;
1464 }
1465
1466 /* ADD/UPD/DEL */
1467 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1468 {
1469 struct sk_buff *skb;
1470 struct sadb_msg *hdr;
1471
1472 skb = pfkey_xfrm_state2msg(x);
1473
1474 if (IS_ERR(skb))
1475 return PTR_ERR(skb);
1476
1477 hdr = (struct sadb_msg *) skb->data;
1478 hdr->sadb_msg_version = PF_KEY_V2;
1479 hdr->sadb_msg_type = event2keytype(c->event);
1480 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1481 hdr->sadb_msg_errno = 0;
1482 hdr->sadb_msg_reserved = 0;
1483 hdr->sadb_msg_seq = c->seq;
1484 hdr->sadb_msg_pid = c->portid;
1485
1486 pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1487
1488 return 0;
1489 }
1490
1491 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1492 {
1493 struct net *net = sock_net(sk);
1494 struct xfrm_state *x;
1495 int err;
1496 struct km_event c;
1497
1498 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1499 if (IS_ERR(x))
1500 return PTR_ERR(x);
1501
1502 xfrm_state_hold(x);
1503 if (hdr->sadb_msg_type == SADB_ADD)
1504 err = xfrm_state_add(x);
1505 else
1506 err = xfrm_state_update(x);
1507
1508 xfrm_audit_state_add(x, err ? 0 : 1, true);
1509
1510 if (err < 0) {
1511 x->km.state = XFRM_STATE_DEAD;
1512 __xfrm_state_put(x);
1513 goto out;
1514 }
1515
1516 if (hdr->sadb_msg_type == SADB_ADD)
1517 c.event = XFRM_MSG_NEWSA;
1518 else
1519 c.event = XFRM_MSG_UPDSA;
1520 c.seq = hdr->sadb_msg_seq;
1521 c.portid = hdr->sadb_msg_pid;
1522 km_state_notify(x, &c);
1523 out:
1524 xfrm_state_put(x);
1525 return err;
1526 }
1527
1528 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1529 {
1530 struct net *net = sock_net(sk);
1531 struct xfrm_state *x;
1532 struct km_event c;
1533 int err;
1534
1535 if (!ext_hdrs[SADB_EXT_SA-1] ||
1536 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1537 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1538 return -EINVAL;
1539
1540 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1541 if (x == NULL)
1542 return -ESRCH;
1543
1544 if ((err = security_xfrm_state_delete(x)))
1545 goto out;
1546
1547 if (xfrm_state_kern(x)) {
1548 err = -EPERM;
1549 goto out;
1550 }
1551
1552 err = xfrm_state_delete(x);
1553
1554 if (err < 0)
1555 goto out;
1556
1557 c.seq = hdr->sadb_msg_seq;
1558 c.portid = hdr->sadb_msg_pid;
1559 c.event = XFRM_MSG_DELSA;
1560 km_state_notify(x, &c);
1561 out:
1562 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1563 xfrm_state_put(x);
1564
1565 return err;
1566 }
1567
1568 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1569 {
1570 struct net *net = sock_net(sk);
1571 __u8 proto;
1572 struct sk_buff *out_skb;
1573 struct sadb_msg *out_hdr;
1574 struct xfrm_state *x;
1575
1576 if (!ext_hdrs[SADB_EXT_SA-1] ||
1577 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1578 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1579 return -EINVAL;
1580
1581 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1582 if (x == NULL)
1583 return -ESRCH;
1584
1585 out_skb = pfkey_xfrm_state2msg(x);
1586 proto = x->id.proto;
1587 xfrm_state_put(x);
1588 if (IS_ERR(out_skb))
1589 return PTR_ERR(out_skb);
1590
1591 out_hdr = (struct sadb_msg *) out_skb->data;
1592 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1593 out_hdr->sadb_msg_type = SADB_GET;
1594 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1595 out_hdr->sadb_msg_errno = 0;
1596 out_hdr->sadb_msg_reserved = 0;
1597 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1598 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1599 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1600
1601 return 0;
1602 }
1603
1604 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1605 gfp_t allocation)
1606 {
1607 struct sk_buff *skb;
1608 struct sadb_msg *hdr;
1609 int len, auth_len, enc_len, i;
1610
1611 auth_len = xfrm_count_pfkey_auth_supported();
1612 if (auth_len) {
1613 auth_len *= sizeof(struct sadb_alg);
1614 auth_len += sizeof(struct sadb_supported);
1615 }
1616
1617 enc_len = xfrm_count_pfkey_enc_supported();
1618 if (enc_len) {
1619 enc_len *= sizeof(struct sadb_alg);
1620 enc_len += sizeof(struct sadb_supported);
1621 }
1622
1623 len = enc_len + auth_len + sizeof(struct sadb_msg);
1624
1625 skb = alloc_skb(len + 16, allocation);
1626 if (!skb)
1627 goto out_put_algs;
1628
1629 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1630 pfkey_hdr_dup(hdr, orig);
1631 hdr->sadb_msg_errno = 0;
1632 hdr->sadb_msg_len = len / sizeof(uint64_t);
1633
1634 if (auth_len) {
1635 struct sadb_supported *sp;
1636 struct sadb_alg *ap;
1637
1638 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1639 ap = (struct sadb_alg *) (sp + 1);
1640
1641 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1642 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1643
1644 for (i = 0; ; i++) {
1645 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1646 if (!aalg)
1647 break;
1648 if (!aalg->pfkey_supported)
1649 continue;
1650 if (aalg->available)
1651 *ap++ = aalg->desc;
1652 }
1653 }
1654
1655 if (enc_len) {
1656 struct sadb_supported *sp;
1657 struct sadb_alg *ap;
1658
1659 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1660 ap = (struct sadb_alg *) (sp + 1);
1661
1662 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1663 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1664
1665 for (i = 0; ; i++) {
1666 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1667 if (!ealg)
1668 break;
1669 if (!ealg->pfkey_supported)
1670 continue;
1671 if (ealg->available)
1672 *ap++ = ealg->desc;
1673 }
1674 }
1675
1676 out_put_algs:
1677 return skb;
1678 }
1679
1680 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1681 {
1682 struct pfkey_sock *pfk = pfkey_sk(sk);
1683 struct sk_buff *supp_skb;
1684
1685 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1686 return -EINVAL;
1687
1688 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1689 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1690 return -EEXIST;
1691 pfk->registered |= (1<<hdr->sadb_msg_satype);
1692 }
1693
1694 xfrm_probe_algs();
1695
1696 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1697 if (!supp_skb) {
1698 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1699 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1700
1701 return -ENOBUFS;
1702 }
1703
1704 pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1705
1706 return 0;
1707 }
1708
1709 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1710 {
1711 struct sk_buff *skb;
1712 struct sadb_msg *hdr;
1713
1714 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1715 if (!skb)
1716 return -ENOBUFS;
1717
1718 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1719 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1720 hdr->sadb_msg_errno = (uint8_t) 0;
1721 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1722
1723 return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1724 }
1725
1726 static int key_notify_sa_flush(const struct km_event *c)
1727 {
1728 struct sk_buff *skb;
1729 struct sadb_msg *hdr;
1730
1731 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1732 if (!skb)
1733 return -ENOBUFS;
1734 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1735 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1736 hdr->sadb_msg_type = SADB_FLUSH;
1737 hdr->sadb_msg_seq = c->seq;
1738 hdr->sadb_msg_pid = c->portid;
1739 hdr->sadb_msg_version = PF_KEY_V2;
1740 hdr->sadb_msg_errno = (uint8_t) 0;
1741 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1742 hdr->sadb_msg_reserved = 0;
1743
1744 pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1745
1746 return 0;
1747 }
1748
1749 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1750 {
1751 struct net *net = sock_net(sk);
1752 unsigned int proto;
1753 struct km_event c;
1754 int err, err2;
1755
1756 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1757 if (proto == 0)
1758 return -EINVAL;
1759
1760 err = xfrm_state_flush(net, proto, true);
1761 err2 = unicast_flush_resp(sk, hdr);
1762 if (err || err2) {
1763 if (err == -ESRCH) /* empty table - go quietly */
1764 err = 0;
1765 return err ? err : err2;
1766 }
1767
1768 c.data.proto = proto;
1769 c.seq = hdr->sadb_msg_seq;
1770 c.portid = hdr->sadb_msg_pid;
1771 c.event = XFRM_MSG_FLUSHSA;
1772 c.net = net;
1773 km_state_notify(NULL, &c);
1774
1775 return 0;
1776 }
1777
1778 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1779 {
1780 struct pfkey_sock *pfk = ptr;
1781 struct sk_buff *out_skb;
1782 struct sadb_msg *out_hdr;
1783
1784 if (!pfkey_can_dump(&pfk->sk))
1785 return -ENOBUFS;
1786
1787 out_skb = pfkey_xfrm_state2msg(x);
1788 if (IS_ERR(out_skb))
1789 return PTR_ERR(out_skb);
1790
1791 out_hdr = (struct sadb_msg *) out_skb->data;
1792 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1793 out_hdr->sadb_msg_type = SADB_DUMP;
1794 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1795 out_hdr->sadb_msg_errno = 0;
1796 out_hdr->sadb_msg_reserved = 0;
1797 out_hdr->sadb_msg_seq = count + 1;
1798 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1799
1800 if (pfk->dump.skb)
1801 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1802 &pfk->sk, sock_net(&pfk->sk));
1803 pfk->dump.skb = out_skb;
1804
1805 return 0;
1806 }
1807
1808 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1809 {
1810 struct net *net = sock_net(&pfk->sk);
1811 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1812 }
1813
1814 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1815 {
1816 struct net *net = sock_net(&pfk->sk);
1817
1818 xfrm_state_walk_done(&pfk->dump.u.state, net);
1819 }
1820
1821 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1822 {
1823 u8 proto;
1824 struct xfrm_address_filter *filter = NULL;
1825 struct pfkey_sock *pfk = pfkey_sk(sk);
1826
1827 mutex_lock(&pfk->dump_lock);
1828 if (pfk->dump.dump != NULL) {
1829 mutex_unlock(&pfk->dump_lock);
1830 return -EBUSY;
1831 }
1832
1833 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1834 if (proto == 0) {
1835 mutex_unlock(&pfk->dump_lock);
1836 return -EINVAL;
1837 }
1838
1839 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1840 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1841
1842 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1843 if (filter == NULL) {
1844 mutex_unlock(&pfk->dump_lock);
1845 return -ENOMEM;
1846 }
1847
1848 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1849 sizeof(xfrm_address_t));
1850 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1851 sizeof(xfrm_address_t));
1852 filter->family = xfilter->sadb_x_filter_family;
1853 filter->splen = xfilter->sadb_x_filter_splen;
1854 filter->dplen = xfilter->sadb_x_filter_dplen;
1855 }
1856
1857 pfk->dump.msg_version = hdr->sadb_msg_version;
1858 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1859 pfk->dump.dump = pfkey_dump_sa;
1860 pfk->dump.done = pfkey_dump_sa_done;
1861 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1862 mutex_unlock(&pfk->dump_lock);
1863
1864 return pfkey_do_dump(pfk);
1865 }
1866
1867 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1868 {
1869 struct pfkey_sock *pfk = pfkey_sk(sk);
1870 int satype = hdr->sadb_msg_satype;
1871 bool reset_errno = false;
1872
1873 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1874 reset_errno = true;
1875 if (satype != 0 && satype != 1)
1876 return -EINVAL;
1877 pfk->promisc = satype;
1878 }
1879 if (reset_errno && skb_cloned(skb))
1880 skb = skb_copy(skb, GFP_KERNEL);
1881 else
1882 skb = skb_clone(skb, GFP_KERNEL);
1883
1884 if (reset_errno && skb) {
1885 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1886 new_hdr->sadb_msg_errno = 0;
1887 }
1888
1889 pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1890 return 0;
1891 }
1892
1893 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1894 {
1895 int i;
1896 u32 reqid = *(u32*)ptr;
1897
1898 for (i=0; i<xp->xfrm_nr; i++) {
1899 if (xp->xfrm_vec[i].reqid == reqid)
1900 return -EEXIST;
1901 }
1902 return 0;
1903 }
1904
1905 static u32 gen_reqid(struct net *net)
1906 {
1907 struct xfrm_policy_walk walk;
1908 u32 start;
1909 int rc;
1910 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1911
1912 start = reqid;
1913 do {
1914 ++reqid;
1915 if (reqid == 0)
1916 reqid = IPSEC_MANUAL_REQID_MAX+1;
1917 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1918 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1919 xfrm_policy_walk_done(&walk, net);
1920 if (rc != -EEXIST)
1921 return reqid;
1922 } while (reqid != start);
1923 return 0;
1924 }
1925
1926 static int
1927 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1928 {
1929 struct net *net = xp_net(xp);
1930 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1931 int mode;
1932
1933 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1934 return -ELOOP;
1935
1936 if (rq->sadb_x_ipsecrequest_mode == 0)
1937 return -EINVAL;
1938
1939 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1940 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1941 return -EINVAL;
1942 t->mode = mode;
1943 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1944 t->optional = 1;
1945 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1946 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1947 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1948 t->reqid = 0;
1949 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1950 return -ENOBUFS;
1951 }
1952
1953 /* addresses present only in tunnel mode */
1954 if (t->mode == XFRM_MODE_TUNNEL) {
1955 int err;
1956
1957 err = parse_sockaddr_pair(
1958 (struct sockaddr *)(rq + 1),
1959 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1960 &t->saddr, &t->id.daddr, &t->encap_family);
1961 if (err)
1962 return err;
1963 } else
1964 t->encap_family = xp->family;
1965
1966 /* No way to set this via kame pfkey */
1967 t->allalgs = 1;
1968 xp->xfrm_nr++;
1969 return 0;
1970 }
1971
1972 static int
1973 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1974 {
1975 int err;
1976 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1977 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1978
1979 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1980 return -EINVAL;
1981
1982 while (len >= sizeof(*rq)) {
1983 if (len < rq->sadb_x_ipsecrequest_len ||
1984 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1985 return -EINVAL;
1986
1987 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1988 return err;
1989 len -= rq->sadb_x_ipsecrequest_len;
1990 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1991 }
1992 return 0;
1993 }
1994
1995 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1996 {
1997 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1998
1999 if (xfrm_ctx) {
2000 int len = sizeof(struct sadb_x_sec_ctx);
2001 len += xfrm_ctx->ctx_len;
2002 return PFKEY_ALIGN8(len);
2003 }
2004 return 0;
2005 }
2006
2007 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2008 {
2009 const struct xfrm_tmpl *t;
2010 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2011 int socklen = 0;
2012 int i;
2013
2014 for (i=0; i<xp->xfrm_nr; i++) {
2015 t = xp->xfrm_vec + i;
2016 socklen += pfkey_sockaddr_len(t->encap_family);
2017 }
2018
2019 return sizeof(struct sadb_msg) +
2020 (sizeof(struct sadb_lifetime) * 3) +
2021 (sizeof(struct sadb_address) * 2) +
2022 (sockaddr_size * 2) +
2023 sizeof(struct sadb_x_policy) +
2024 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2025 (socklen * 2) +
2026 pfkey_xfrm_policy2sec_ctx_size(xp);
2027 }
2028
2029 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2030 {
2031 struct sk_buff *skb;
2032 int size;
2033
2034 size = pfkey_xfrm_policy2msg_size(xp);
2035
2036 skb = alloc_skb(size + 16, GFP_ATOMIC);
2037 if (skb == NULL)
2038 return ERR_PTR(-ENOBUFS);
2039
2040 return skb;
2041 }
2042
2043 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2044 {
2045 struct sadb_msg *hdr;
2046 struct sadb_address *addr;
2047 struct sadb_lifetime *lifetime;
2048 struct sadb_x_policy *pol;
2049 struct sadb_x_sec_ctx *sec_ctx;
2050 struct xfrm_sec_ctx *xfrm_ctx;
2051 int i;
2052 int size;
2053 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2054 int socklen = pfkey_sockaddr_len(xp->family);
2055
2056 size = pfkey_xfrm_policy2msg_size(xp);
2057
2058 /* call should fill header later */
2059 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2060 memset(hdr, 0, size); /* XXX do we need this ? */
2061
2062 /* src address */
2063 addr = (struct sadb_address*) skb_put(skb,
2064 sizeof(struct sadb_address)+sockaddr_size);
2065 addr->sadb_address_len =
2066 (sizeof(struct sadb_address)+sockaddr_size)/
2067 sizeof(uint64_t);
2068 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2069 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2070 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2071 addr->sadb_address_reserved = 0;
2072 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2073 xp->selector.sport,
2074 (struct sockaddr *) (addr + 1),
2075 xp->family))
2076 BUG();
2077
2078 /* dst address */
2079 addr = (struct sadb_address*) skb_put(skb,
2080 sizeof(struct sadb_address)+sockaddr_size);
2081 addr->sadb_address_len =
2082 (sizeof(struct sadb_address)+sockaddr_size)/
2083 sizeof(uint64_t);
2084 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2085 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2086 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2087 addr->sadb_address_reserved = 0;
2088
2089 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2090 (struct sockaddr *) (addr + 1),
2091 xp->family);
2092
2093 /* hard time */
2094 lifetime = (struct sadb_lifetime *) skb_put(skb,
2095 sizeof(struct sadb_lifetime));
2096 lifetime->sadb_lifetime_len =
2097 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2098 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2099 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2100 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2101 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2102 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2103 /* soft time */
2104 lifetime = (struct sadb_lifetime *) skb_put(skb,
2105 sizeof(struct sadb_lifetime));
2106 lifetime->sadb_lifetime_len =
2107 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2108 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2109 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2110 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2111 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2112 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2113 /* current time */
2114 lifetime = (struct sadb_lifetime *) skb_put(skb,
2115 sizeof(struct sadb_lifetime));
2116 lifetime->sadb_lifetime_len =
2117 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2118 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2119 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2120 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2121 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2122 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2123
2124 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2125 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2126 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2127 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2128 if (xp->action == XFRM_POLICY_ALLOW) {
2129 if (xp->xfrm_nr)
2130 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2131 else
2132 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2133 }
2134 pol->sadb_x_policy_dir = dir+1;
2135 pol->sadb_x_policy_reserved = 0;
2136 pol->sadb_x_policy_id = xp->index;
2137 pol->sadb_x_policy_priority = xp->priority;
2138
2139 for (i=0; i<xp->xfrm_nr; i++) {
2140 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2141 struct sadb_x_ipsecrequest *rq;
2142 int req_size;
2143 int mode;
2144
2145 req_size = sizeof(struct sadb_x_ipsecrequest);
2146 if (t->mode == XFRM_MODE_TUNNEL) {
2147 socklen = pfkey_sockaddr_len(t->encap_family);
2148 req_size += socklen * 2;
2149 } else {
2150 size -= 2*socklen;
2151 }
2152 rq = (void*)skb_put(skb, req_size);
2153 pol->sadb_x_policy_len += req_size/8;
2154 memset(rq, 0, sizeof(*rq));
2155 rq->sadb_x_ipsecrequest_len = req_size;
2156 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2157 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2158 return -EINVAL;
2159 rq->sadb_x_ipsecrequest_mode = mode;
2160 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2161 if (t->reqid)
2162 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2163 if (t->optional)
2164 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2165 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2166
2167 if (t->mode == XFRM_MODE_TUNNEL) {
2168 u8 *sa = (void *)(rq + 1);
2169 pfkey_sockaddr_fill(&t->saddr, 0,
2170 (struct sockaddr *)sa,
2171 t->encap_family);
2172 pfkey_sockaddr_fill(&t->id.daddr, 0,
2173 (struct sockaddr *) (sa + socklen),
2174 t->encap_family);
2175 }
2176 }
2177
2178 /* security context */
2179 if ((xfrm_ctx = xp->security)) {
2180 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2181
2182 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2183 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2184 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2185 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2186 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2187 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2188 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2189 xfrm_ctx->ctx_len);
2190 }
2191
2192 hdr->sadb_msg_len = size / sizeof(uint64_t);
2193 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2194
2195 return 0;
2196 }
2197
2198 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2199 {
2200 struct sk_buff *out_skb;
2201 struct sadb_msg *out_hdr;
2202 int err;
2203
2204 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2205 if (IS_ERR(out_skb))
2206 return PTR_ERR(out_skb);
2207
2208 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2209 if (err < 0)
2210 return err;
2211
2212 out_hdr = (struct sadb_msg *) out_skb->data;
2213 out_hdr->sadb_msg_version = PF_KEY_V2;
2214
2215 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2216 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2217 else
2218 out_hdr->sadb_msg_type = event2poltype(c->event);
2219 out_hdr->sadb_msg_errno = 0;
2220 out_hdr->sadb_msg_seq = c->seq;
2221 out_hdr->sadb_msg_pid = c->portid;
2222 pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2223 return 0;
2224
2225 }
2226
2227 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2228 {
2229 struct net *net = sock_net(sk);
2230 int err = 0;
2231 struct sadb_lifetime *lifetime;
2232 struct sadb_address *sa;
2233 struct sadb_x_policy *pol;
2234 struct xfrm_policy *xp;
2235 struct km_event c;
2236 struct sadb_x_sec_ctx *sec_ctx;
2237
2238 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2239 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2240 !ext_hdrs[SADB_X_EXT_POLICY-1])
2241 return -EINVAL;
2242
2243 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2244 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2245 return -EINVAL;
2246 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2247 return -EINVAL;
2248
2249 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2250 if (xp == NULL)
2251 return -ENOBUFS;
2252
2253 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2254 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2255 xp->priority = pol->sadb_x_policy_priority;
2256
2257 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2258 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2259 xp->selector.family = xp->family;
2260 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2261 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2262 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2263 if (xp->selector.sport)
2264 xp->selector.sport_mask = htons(0xffff);
2265
2266 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2267 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2268 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2269
2270 /* Amusing, we set this twice. KAME apps appear to set same value
2271 * in both addresses.
2272 */
2273 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2274
2275 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2276 if (xp->selector.dport)
2277 xp->selector.dport_mask = htons(0xffff);
2278
2279 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2280 if (sec_ctx != NULL) {
2281 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2282
2283 if (!uctx) {
2284 err = -ENOBUFS;
2285 goto out;
2286 }
2287
2288 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2289 kfree(uctx);
2290
2291 if (err)
2292 goto out;
2293 }
2294
2295 xp->lft.soft_byte_limit = XFRM_INF;
2296 xp->lft.hard_byte_limit = XFRM_INF;
2297 xp->lft.soft_packet_limit = XFRM_INF;
2298 xp->lft.hard_packet_limit = XFRM_INF;
2299 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2300 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2301 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2302 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2303 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2304 }
2305 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2306 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2307 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2308 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2309 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2310 }
2311 xp->xfrm_nr = 0;
2312 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2313 (err = parse_ipsecrequests(xp, pol)) < 0)
2314 goto out;
2315
2316 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2317 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2318
2319 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2320
2321 if (err)
2322 goto out;
2323
2324 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2325 c.event = XFRM_MSG_UPDPOLICY;
2326 else
2327 c.event = XFRM_MSG_NEWPOLICY;
2328
2329 c.seq = hdr->sadb_msg_seq;
2330 c.portid = hdr->sadb_msg_pid;
2331
2332 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2333 xfrm_pol_put(xp);
2334 return 0;
2335
2336 out:
2337 xp->walk.dead = 1;
2338 xfrm_policy_destroy(xp);
2339 return err;
2340 }
2341
2342 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2343 {
2344 struct net *net = sock_net(sk);
2345 int err;
2346 struct sadb_address *sa;
2347 struct sadb_x_policy *pol;
2348 struct xfrm_policy *xp;
2349 struct xfrm_selector sel;
2350 struct km_event c;
2351 struct sadb_x_sec_ctx *sec_ctx;
2352 struct xfrm_sec_ctx *pol_ctx = NULL;
2353
2354 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2355 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2356 !ext_hdrs[SADB_X_EXT_POLICY-1])
2357 return -EINVAL;
2358
2359 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2360 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2361 return -EINVAL;
2362
2363 memset(&sel, 0, sizeof(sel));
2364
2365 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2366 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2367 sel.prefixlen_s = sa->sadb_address_prefixlen;
2368 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2369 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2370 if (sel.sport)
2371 sel.sport_mask = htons(0xffff);
2372
2373 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2374 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2375 sel.prefixlen_d = sa->sadb_address_prefixlen;
2376 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2377 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2378 if (sel.dport)
2379 sel.dport_mask = htons(0xffff);
2380
2381 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2382 if (sec_ctx != NULL) {
2383 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2384
2385 if (!uctx)
2386 return -ENOMEM;
2387
2388 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2389 kfree(uctx);
2390 if (err)
2391 return err;
2392 }
2393
2394 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2395 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2396 1, &err);
2397 security_xfrm_policy_free(pol_ctx);
2398 if (xp == NULL)
2399 return -ENOENT;
2400
2401 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2402
2403 if (err)
2404 goto out;
2405
2406 c.seq = hdr->sadb_msg_seq;
2407 c.portid = hdr->sadb_msg_pid;
2408 c.data.byid = 0;
2409 c.event = XFRM_MSG_DELPOLICY;
2410 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2411
2412 out:
2413 xfrm_pol_put(xp);
2414 if (err == 0)
2415 xfrm_garbage_collect(net);
2416 return err;
2417 }
2418
2419 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2420 {
2421 int err;
2422 struct sk_buff *out_skb;
2423 struct sadb_msg *out_hdr;
2424 err = 0;
2425
2426 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2427 if (IS_ERR(out_skb)) {
2428 err = PTR_ERR(out_skb);
2429 goto out;
2430 }
2431 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2432 if (err < 0)
2433 goto out;
2434
2435 out_hdr = (struct sadb_msg *) out_skb->data;
2436 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2437 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2438 out_hdr->sadb_msg_satype = 0;
2439 out_hdr->sadb_msg_errno = 0;
2440 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2441 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2442 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2443 err = 0;
2444
2445 out:
2446 return err;
2447 }
2448
2449 static int pfkey_sockaddr_pair_size(sa_family_t family)
2450 {
2451 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2452 }
2453
2454 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2455 xfrm_address_t *saddr, xfrm_address_t *daddr,
2456 u16 *family)
2457 {
2458 int af, socklen;
2459
2460 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2461 return -EINVAL;
2462
2463 af = pfkey_sockaddr_extract(sa, saddr);
2464 if (!af)
2465 return -EINVAL;
2466
2467 socklen = pfkey_sockaddr_len(af);
2468 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2469 daddr) != af)
2470 return -EINVAL;
2471
2472 *family = af;
2473 return 0;
2474 }
2475
2476 #ifdef CONFIG_NET_KEY_MIGRATE
2477 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2478 struct xfrm_migrate *m)
2479 {
2480 int err;
2481 struct sadb_x_ipsecrequest *rq2;
2482 int mode;
2483
2484 if (len < sizeof(*rq1) ||
2485 len < rq1->sadb_x_ipsecrequest_len ||
2486 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2487 return -EINVAL;
2488
2489 /* old endoints */
2490 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2491 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2492 &m->old_saddr, &m->old_daddr,
2493 &m->old_family);
2494 if (err)
2495 return err;
2496
2497 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2498 len -= rq1->sadb_x_ipsecrequest_len;
2499
2500 if (len <= sizeof(*rq2) ||
2501 len < rq2->sadb_x_ipsecrequest_len ||
2502 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2503 return -EINVAL;
2504
2505 /* new endpoints */
2506 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2507 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2508 &m->new_saddr, &m->new_daddr,
2509 &m->new_family);
2510 if (err)
2511 return err;
2512
2513 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2514 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2515 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2516 return -EINVAL;
2517
2518 m->proto = rq1->sadb_x_ipsecrequest_proto;
2519 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2520 return -EINVAL;
2521 m->mode = mode;
2522 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2523
2524 return ((int)(rq1->sadb_x_ipsecrequest_len +
2525 rq2->sadb_x_ipsecrequest_len));
2526 }
2527
2528 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2529 const struct sadb_msg *hdr, void * const *ext_hdrs)
2530 {
2531 int i, len, ret, err = -EINVAL;
2532 u8 dir;
2533 struct sadb_address *sa;
2534 struct sadb_x_kmaddress *kma;
2535 struct sadb_x_policy *pol;
2536 struct sadb_x_ipsecrequest *rq;
2537 struct xfrm_selector sel;
2538 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2539 struct xfrm_kmaddress k;
2540 struct net *net = sock_net(sk);
2541
2542 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2543 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2544 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2545 err = -EINVAL;
2546 goto out;
2547 }
2548
2549 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2550 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2551
2552 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2553 err = -EINVAL;
2554 goto out;
2555 }
2556
2557 if (kma) {
2558 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2559 k.reserved = kma->sadb_x_kmaddress_reserved;
2560 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2561 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2562 &k.local, &k.remote, &k.family);
2563 if (ret < 0) {
2564 err = ret;
2565 goto out;
2566 }
2567 }
2568
2569 dir = pol->sadb_x_policy_dir - 1;
2570 memset(&sel, 0, sizeof(sel));
2571
2572 /* set source address info of selector */
2573 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2574 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2575 sel.prefixlen_s = sa->sadb_address_prefixlen;
2576 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2577 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2578 if (sel.sport)
2579 sel.sport_mask = htons(0xffff);
2580
2581 /* set destination address info of selector */
2582 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2583 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2584 sel.prefixlen_d = sa->sadb_address_prefixlen;
2585 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2586 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2587 if (sel.dport)
2588 sel.dport_mask = htons(0xffff);
2589
2590 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2591
2592 /* extract ipsecrequests */
2593 i = 0;
2594 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2595
2596 while (len > 0 && i < XFRM_MAX_DEPTH) {
2597 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2598 if (ret < 0) {
2599 err = ret;
2600 goto out;
2601 } else {
2602 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2603 len -= ret;
2604 i++;
2605 }
2606 }
2607
2608 if (!i || len > 0) {
2609 err = -EINVAL;
2610 goto out;
2611 }
2612
2613 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2614 kma ? &k : NULL, net);
2615
2616 out:
2617 return err;
2618 }
2619 #else
2620 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2621 const struct sadb_msg *hdr, void * const *ext_hdrs)
2622 {
2623 return -ENOPROTOOPT;
2624 }
2625 #endif
2626
2627
2628 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2629 {
2630 struct net *net = sock_net(sk);
2631 unsigned int dir;
2632 int err = 0, delete;
2633 struct sadb_x_policy *pol;
2634 struct xfrm_policy *xp;
2635 struct km_event c;
2636
2637 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2638 return -EINVAL;
2639
2640 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2641 if (dir >= XFRM_POLICY_MAX)
2642 return -EINVAL;
2643
2644 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2645 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2646 dir, pol->sadb_x_policy_id, delete, &err);
2647 if (xp == NULL)
2648 return -ENOENT;
2649
2650 if (delete) {
2651 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2652
2653 if (err)
2654 goto out;
2655 c.seq = hdr->sadb_msg_seq;
2656 c.portid = hdr->sadb_msg_pid;
2657 c.data.byid = 1;
2658 c.event = XFRM_MSG_DELPOLICY;
2659 km_policy_notify(xp, dir, &c);
2660 } else {
2661 err = key_pol_get_resp(sk, xp, hdr, dir);
2662 }
2663
2664 out:
2665 xfrm_pol_put(xp);
2666 if (delete && err == 0)
2667 xfrm_garbage_collect(net);
2668 return err;
2669 }
2670
2671 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2672 {
2673 struct pfkey_sock *pfk = ptr;
2674 struct sk_buff *out_skb;
2675 struct sadb_msg *out_hdr;
2676 int err;
2677
2678 if (!pfkey_can_dump(&pfk->sk))
2679 return -ENOBUFS;
2680
2681 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2682 if (IS_ERR(out_skb))
2683 return PTR_ERR(out_skb);
2684
2685 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2686 if (err < 0)
2687 return err;
2688
2689 out_hdr = (struct sadb_msg *) out_skb->data;
2690 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2691 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2692 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2693 out_hdr->sadb_msg_errno = 0;
2694 out_hdr->sadb_msg_seq = count + 1;
2695 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2696
2697 if (pfk->dump.skb)
2698 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2699 &pfk->sk, sock_net(&pfk->sk));
2700 pfk->dump.skb = out_skb;
2701
2702 return 0;
2703 }
2704
2705 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2706 {
2707 struct net *net = sock_net(&pfk->sk);
2708 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2709 }
2710
2711 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2712 {
2713 struct net *net = sock_net((struct sock *)pfk);
2714
2715 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2716 }
2717
2718 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2719 {
2720 struct pfkey_sock *pfk = pfkey_sk(sk);
2721
2722 mutex_lock(&pfk->dump_lock);
2723 if (pfk->dump.dump != NULL) {
2724 mutex_unlock(&pfk->dump_lock);
2725 return -EBUSY;
2726 }
2727
2728 pfk->dump.msg_version = hdr->sadb_msg_version;
2729 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2730 pfk->dump.dump = pfkey_dump_sp;
2731 pfk->dump.done = pfkey_dump_sp_done;
2732 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2733 mutex_unlock(&pfk->dump_lock);
2734
2735 return pfkey_do_dump(pfk);
2736 }
2737
2738 static int key_notify_policy_flush(const struct km_event *c)
2739 {
2740 struct sk_buff *skb_out;
2741 struct sadb_msg *hdr;
2742
2743 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2744 if (!skb_out)
2745 return -ENOBUFS;
2746 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2747 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2748 hdr->sadb_msg_seq = c->seq;
2749 hdr->sadb_msg_pid = c->portid;
2750 hdr->sadb_msg_version = PF_KEY_V2;
2751 hdr->sadb_msg_errno = (uint8_t) 0;
2752 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2753 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2754 hdr->sadb_msg_reserved = 0;
2755 pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2756 return 0;
2757
2758 }
2759
2760 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2761 {
2762 struct net *net = sock_net(sk);
2763 struct km_event c;
2764 int err, err2;
2765
2766 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2767 if (!err)
2768 xfrm_garbage_collect(net);
2769 err2 = unicast_flush_resp(sk, hdr);
2770 if (err || err2) {
2771 if (err == -ESRCH) /* empty table - old silent behavior */
2772 return 0;
2773 return err;
2774 }
2775
2776 c.data.type = XFRM_POLICY_TYPE_MAIN;
2777 c.event = XFRM_MSG_FLUSHPOLICY;
2778 c.portid = hdr->sadb_msg_pid;
2779 c.seq = hdr->sadb_msg_seq;
2780 c.net = net;
2781 km_policy_notify(NULL, 0, &c);
2782
2783 return 0;
2784 }
2785
2786 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2787 const struct sadb_msg *hdr, void * const *ext_hdrs);
2788 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2789 [SADB_RESERVED] = pfkey_reserved,
2790 [SADB_GETSPI] = pfkey_getspi,
2791 [SADB_UPDATE] = pfkey_add,
2792 [SADB_ADD] = pfkey_add,
2793 [SADB_DELETE] = pfkey_delete,
2794 [SADB_GET] = pfkey_get,
2795 [SADB_ACQUIRE] = pfkey_acquire,
2796 [SADB_REGISTER] = pfkey_register,
2797 [SADB_EXPIRE] = NULL,
2798 [SADB_FLUSH] = pfkey_flush,
2799 [SADB_DUMP] = pfkey_dump,
2800 [SADB_X_PROMISC] = pfkey_promisc,
2801 [SADB_X_PCHANGE] = NULL,
2802 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2803 [SADB_X_SPDADD] = pfkey_spdadd,
2804 [SADB_X_SPDDELETE] = pfkey_spddelete,
2805 [SADB_X_SPDGET] = pfkey_spdget,
2806 [SADB_X_SPDACQUIRE] = NULL,
2807 [SADB_X_SPDDUMP] = pfkey_spddump,
2808 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2809 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2810 [SADB_X_SPDDELETE2] = pfkey_spdget,
2811 [SADB_X_MIGRATE] = pfkey_migrate,
2812 };
2813
2814 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2815 {
2816 void *ext_hdrs[SADB_EXT_MAX];
2817 int err;
2818
2819 pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2820 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2821
2822 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2823 err = parse_exthdrs(skb, hdr, ext_hdrs);
2824 if (!err) {
2825 err = -EOPNOTSUPP;
2826 if (pfkey_funcs[hdr->sadb_msg_type])
2827 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2828 }
2829 return err;
2830 }
2831
2832 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2833 {
2834 struct sadb_msg *hdr = NULL;
2835
2836 if (skb->len < sizeof(*hdr)) {
2837 *errp = -EMSGSIZE;
2838 } else {
2839 hdr = (struct sadb_msg *) skb->data;
2840 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2841 hdr->sadb_msg_reserved != 0 ||
2842 (hdr->sadb_msg_type <= SADB_RESERVED ||
2843 hdr->sadb_msg_type > SADB_MAX)) {
2844 hdr = NULL;
2845 *errp = -EINVAL;
2846 } else if (hdr->sadb_msg_len != (skb->len /
2847 sizeof(uint64_t)) ||
2848 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2849 sizeof(uint64_t))) {
2850 hdr = NULL;
2851 *errp = -EMSGSIZE;
2852 } else {
2853 *errp = 0;
2854 }
2855 }
2856 return hdr;
2857 }
2858
2859 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2860 const struct xfrm_algo_desc *d)
2861 {
2862 unsigned int id = d->desc.sadb_alg_id;
2863
2864 if (id >= sizeof(t->aalgos) * 8)
2865 return 0;
2866
2867 return (t->aalgos >> id) & 1;
2868 }
2869
2870 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2871 const struct xfrm_algo_desc *d)
2872 {
2873 unsigned int id = d->desc.sadb_alg_id;
2874
2875 if (id >= sizeof(t->ealgos) * 8)
2876 return 0;
2877
2878 return (t->ealgos >> id) & 1;
2879 }
2880
2881 static int count_ah_combs(const struct xfrm_tmpl *t)
2882 {
2883 int i, sz = 0;
2884
2885 for (i = 0; ; i++) {
2886 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2887 if (!aalg)
2888 break;
2889 if (!aalg->pfkey_supported)
2890 continue;
2891 if (aalg_tmpl_set(t, aalg) && aalg->available)
2892 sz += sizeof(struct sadb_comb);
2893 }
2894 return sz + sizeof(struct sadb_prop);
2895 }
2896
2897 static int count_esp_combs(const struct xfrm_tmpl *t)
2898 {
2899 int i, k, sz = 0;
2900
2901 for (i = 0; ; i++) {
2902 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2903 if (!ealg)
2904 break;
2905
2906 if (!ealg->pfkey_supported)
2907 continue;
2908
2909 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2910 continue;
2911
2912 for (k = 1; ; k++) {
2913 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2914 if (!aalg)
2915 break;
2916
2917 if (!aalg->pfkey_supported)
2918 continue;
2919
2920 if (aalg_tmpl_set(t, aalg) && aalg->available)
2921 sz += sizeof(struct sadb_comb);
2922 }
2923 }
2924 return sz + sizeof(struct sadb_prop);
2925 }
2926
2927 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2928 {
2929 struct sadb_prop *p;
2930 int i;
2931
2932 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2933 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2934 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2935 p->sadb_prop_replay = 32;
2936 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2937
2938 for (i = 0; ; i++) {
2939 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2940 if (!aalg)
2941 break;
2942
2943 if (!aalg->pfkey_supported)
2944 continue;
2945
2946 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2947 struct sadb_comb *c;
2948 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2949 memset(c, 0, sizeof(*c));
2950 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2951 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2952 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2953 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2954 c->sadb_comb_hard_addtime = 24*60*60;
2955 c->sadb_comb_soft_addtime = 20*60*60;
2956 c->sadb_comb_hard_usetime = 8*60*60;
2957 c->sadb_comb_soft_usetime = 7*60*60;
2958 }
2959 }
2960 }
2961
2962 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2963 {
2964 struct sadb_prop *p;
2965 int i, k;
2966
2967 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2968 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2969 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2970 p->sadb_prop_replay = 32;
2971 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2972
2973 for (i=0; ; i++) {
2974 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2975 if (!ealg)
2976 break;
2977
2978 if (!ealg->pfkey_supported)
2979 continue;
2980
2981 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2982 continue;
2983
2984 for (k = 1; ; k++) {
2985 struct sadb_comb *c;
2986 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2987 if (!aalg)
2988 break;
2989 if (!aalg->pfkey_supported)
2990 continue;
2991 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2992 continue;
2993 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2994 memset(c, 0, sizeof(*c));
2995 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2996 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2997 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2998 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2999 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3000 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3001 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3002 c->sadb_comb_hard_addtime = 24*60*60;
3003 c->sadb_comb_soft_addtime = 20*60*60;
3004 c->sadb_comb_hard_usetime = 8*60*60;
3005 c->sadb_comb_soft_usetime = 7*60*60;
3006 }
3007 }
3008 }
3009
3010 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3011 {
3012 return 0;
3013 }
3014
3015 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3016 {
3017 struct sk_buff *out_skb;
3018 struct sadb_msg *out_hdr;
3019 int hard;
3020 int hsc;
3021
3022 hard = c->data.hard;
3023 if (hard)
3024 hsc = 2;
3025 else
3026 hsc = 1;
3027
3028 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3029 if (IS_ERR(out_skb))
3030 return PTR_ERR(out_skb);
3031
3032 out_hdr = (struct sadb_msg *) out_skb->data;
3033 out_hdr->sadb_msg_version = PF_KEY_V2;
3034 out_hdr->sadb_msg_type = SADB_EXPIRE;
3035 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3036 out_hdr->sadb_msg_errno = 0;
3037 out_hdr->sadb_msg_reserved = 0;
3038 out_hdr->sadb_msg_seq = 0;
3039 out_hdr->sadb_msg_pid = 0;
3040
3041 pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3042 return 0;
3043 }
3044
3045 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3046 {
3047 struct net *net = x ? xs_net(x) : c->net;
3048 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3049
3050 if (atomic_read(&net_pfkey->socks_nr) == 0)
3051 return 0;
3052
3053 switch (c->event) {
3054 case XFRM_MSG_EXPIRE:
3055 return key_notify_sa_expire(x, c);
3056 case XFRM_MSG_DELSA:
3057 case XFRM_MSG_NEWSA:
3058 case XFRM_MSG_UPDSA:
3059 return key_notify_sa(x, c);
3060 case XFRM_MSG_FLUSHSA:
3061 return key_notify_sa_flush(c);
3062 case XFRM_MSG_NEWAE: /* not yet supported */
3063 break;
3064 default:
3065 pr_err("pfkey: Unknown SA event %d\n", c->event);
3066 break;
3067 }
3068
3069 return 0;
3070 }
3071
3072 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3073 {
3074 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3075 return 0;
3076
3077 switch (c->event) {
3078 case XFRM_MSG_POLEXPIRE:
3079 return key_notify_policy_expire(xp, c);
3080 case XFRM_MSG_DELPOLICY:
3081 case XFRM_MSG_NEWPOLICY:
3082 case XFRM_MSG_UPDPOLICY:
3083 return key_notify_policy(xp, dir, c);
3084 case XFRM_MSG_FLUSHPOLICY:
3085 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3086 break;
3087 return key_notify_policy_flush(c);
3088 default:
3089 pr_err("pfkey: Unknown policy event %d\n", c->event);
3090 break;
3091 }
3092
3093 return 0;
3094 }
3095
3096 static u32 get_acqseq(void)
3097 {
3098 u32 res;
3099 static atomic_t acqseq;
3100
3101 do {
3102 res = atomic_inc_return(&acqseq);
3103 } while (!res);
3104 return res;
3105 }
3106
3107 static bool pfkey_is_alive(const struct km_event *c)
3108 {
3109 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3110 struct sock *sk;
3111 bool is_alive = false;
3112
3113 rcu_read_lock();
3114 sk_for_each_rcu(sk, &net_pfkey->table) {
3115 if (pfkey_sk(sk)->registered) {
3116 is_alive = true;
3117 break;
3118 }
3119 }
3120 rcu_read_unlock();
3121
3122 return is_alive;
3123 }
3124
3125 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3126 {
3127 struct sk_buff *skb;
3128 struct sadb_msg *hdr;
3129 struct sadb_address *addr;
3130 struct sadb_x_policy *pol;
3131 int sockaddr_size;
3132 int size;
3133 struct sadb_x_sec_ctx *sec_ctx;
3134 struct xfrm_sec_ctx *xfrm_ctx;
3135 int ctx_size = 0;
3136
3137 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3138 if (!sockaddr_size)
3139 return -EINVAL;
3140
3141 size = sizeof(struct sadb_msg) +
3142 (sizeof(struct sadb_address) * 2) +
3143 (sockaddr_size * 2) +
3144 sizeof(struct sadb_x_policy);
3145
3146 if (x->id.proto == IPPROTO_AH)
3147 size += count_ah_combs(t);
3148 else if (x->id.proto == IPPROTO_ESP)
3149 size += count_esp_combs(t);
3150
3151 if ((xfrm_ctx = x->security)) {
3152 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3153 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3154 }
3155
3156 skb = alloc_skb(size + 16, GFP_ATOMIC);
3157 if (skb == NULL)
3158 return -ENOMEM;
3159
3160 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3161 hdr->sadb_msg_version = PF_KEY_V2;
3162 hdr->sadb_msg_type = SADB_ACQUIRE;
3163 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3164 hdr->sadb_msg_len = size / sizeof(uint64_t);
3165 hdr->sadb_msg_errno = 0;
3166 hdr->sadb_msg_reserved = 0;
3167 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3168 hdr->sadb_msg_pid = 0;
3169
3170 /* src address */
3171 addr = (struct sadb_address*) skb_put(skb,
3172 sizeof(struct sadb_address)+sockaddr_size);
3173 addr->sadb_address_len =
3174 (sizeof(struct sadb_address)+sockaddr_size)/
3175 sizeof(uint64_t);
3176 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3177 addr->sadb_address_proto = 0;
3178 addr->sadb_address_reserved = 0;
3179 addr->sadb_address_prefixlen =
3180 pfkey_sockaddr_fill(&x->props.saddr, 0,
3181 (struct sockaddr *) (addr + 1),
3182 x->props.family);
3183 if (!addr->sadb_address_prefixlen)
3184 BUG();
3185
3186 /* dst address */
3187 addr = (struct sadb_address*) skb_put(skb,
3188 sizeof(struct sadb_address)+sockaddr_size);
3189 addr->sadb_address_len =
3190 (sizeof(struct sadb_address)+sockaddr_size)/
3191 sizeof(uint64_t);
3192 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3193 addr->sadb_address_proto = 0;
3194 addr->sadb_address_reserved = 0;
3195 addr->sadb_address_prefixlen =
3196 pfkey_sockaddr_fill(&x->id.daddr, 0,
3197 (struct sockaddr *) (addr + 1),
3198 x->props.family);
3199 if (!addr->sadb_address_prefixlen)
3200 BUG();
3201
3202 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3203 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3204 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3205 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3206 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3207 pol->sadb_x_policy_reserved = 0;
3208 pol->sadb_x_policy_id = xp->index;
3209 pol->sadb_x_policy_priority = xp->priority;
3210
3211 /* Set sadb_comb's. */
3212 if (x->id.proto == IPPROTO_AH)
3213 dump_ah_combs(skb, t);
3214 else if (x->id.proto == IPPROTO_ESP)
3215 dump_esp_combs(skb, t);
3216
3217 /* security context */
3218 if (xfrm_ctx) {
3219 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3220 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3221 sec_ctx->sadb_x_sec_len =
3222 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3223 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3224 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3225 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3226 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3227 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3228 xfrm_ctx->ctx_len);
3229 }
3230
3231 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3232 }
3233
3234 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3235 u8 *data, int len, int *dir)
3236 {
3237 struct net *net = sock_net(sk);
3238 struct xfrm_policy *xp;
3239 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3240 struct sadb_x_sec_ctx *sec_ctx;
3241
3242 switch (sk->sk_family) {
3243 case AF_INET:
3244 if (opt != IP_IPSEC_POLICY) {
3245 *dir = -EOPNOTSUPP;
3246 return NULL;
3247 }
3248 break;
3249 #if IS_ENABLED(CONFIG_IPV6)
3250 case AF_INET6:
3251 if (opt != IPV6_IPSEC_POLICY) {
3252 *dir = -EOPNOTSUPP;
3253 return NULL;
3254 }
3255 break;
3256 #endif
3257 default:
3258 *dir = -EINVAL;
3259 return NULL;
3260 }
3261
3262 *dir = -EINVAL;
3263
3264 if (len < sizeof(struct sadb_x_policy) ||
3265 pol->sadb_x_policy_len*8 > len ||
3266 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3267 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3268 return NULL;
3269
3270 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3271 if (xp == NULL) {
3272 *dir = -ENOBUFS;
3273 return NULL;
3274 }
3275
3276 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3277 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3278
3279 xp->lft.soft_byte_limit = XFRM_INF;
3280 xp->lft.hard_byte_limit = XFRM_INF;
3281 xp->lft.soft_packet_limit = XFRM_INF;
3282 xp->lft.hard_packet_limit = XFRM_INF;
3283 xp->family = sk->sk_family;
3284
3285 xp->xfrm_nr = 0;
3286 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3287 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3288 goto out;
3289
3290 /* security context too */
3291 if (len >= (pol->sadb_x_policy_len*8 +
3292 sizeof(struct sadb_x_sec_ctx))) {
3293 char *p = (char *)pol;
3294 struct xfrm_user_sec_ctx *uctx;
3295
3296 p += pol->sadb_x_policy_len*8;
3297 sec_ctx = (struct sadb_x_sec_ctx *)p;
3298 if (len < pol->sadb_x_policy_len*8 +
3299 sec_ctx->sadb_x_sec_len*8) {
3300 *dir = -EINVAL;
3301 goto out;
3302 }
3303 if ((*dir = verify_sec_ctx_len(p)))
3304 goto out;
3305 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3306 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3307 kfree(uctx);
3308
3309 if (*dir)
3310 goto out;
3311 }
3312
3313 *dir = pol->sadb_x_policy_dir-1;
3314 return xp;
3315
3316 out:
3317 xp->walk.dead = 1;
3318 xfrm_policy_destroy(xp);
3319 return NULL;
3320 }
3321
3322 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3323 {
3324 struct sk_buff *skb;
3325 struct sadb_msg *hdr;
3326 struct sadb_sa *sa;
3327 struct sadb_address *addr;
3328 struct sadb_x_nat_t_port *n_port;
3329 int sockaddr_size;
3330 int size;
3331 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3332 struct xfrm_encap_tmpl *natt = NULL;
3333
3334 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3335 if (!sockaddr_size)
3336 return -EINVAL;
3337
3338 if (!satype)
3339 return -EINVAL;
3340
3341 if (!x->encap)
3342 return -EINVAL;
3343
3344 natt = x->encap;
3345
3346 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3347 *
3348 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3349 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3350 */
3351
3352 size = sizeof(struct sadb_msg) +
3353 sizeof(struct sadb_sa) +
3354 (sizeof(struct sadb_address) * 2) +
3355 (sockaddr_size * 2) +
3356 (sizeof(struct sadb_x_nat_t_port) * 2);
3357
3358 skb = alloc_skb(size + 16, GFP_ATOMIC);
3359 if (skb == NULL)
3360 return -ENOMEM;
3361
3362 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3363 hdr->sadb_msg_version = PF_KEY_V2;
3364 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3365 hdr->sadb_msg_satype = satype;
3366 hdr->sadb_msg_len = size / sizeof(uint64_t);
3367 hdr->sadb_msg_errno = 0;
3368 hdr->sadb_msg_reserved = 0;
3369 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3370 hdr->sadb_msg_pid = 0;
3371
3372 /* SA */
3373 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3374 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3375 sa->sadb_sa_exttype = SADB_EXT_SA;
3376 sa->sadb_sa_spi = x->id.spi;
3377 sa->sadb_sa_replay = 0;
3378 sa->sadb_sa_state = 0;
3379 sa->sadb_sa_auth = 0;
3380 sa->sadb_sa_encrypt = 0;
3381 sa->sadb_sa_flags = 0;
3382
3383 /* ADDRESS_SRC (old addr) */
3384 addr = (struct sadb_address*)
3385 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3386 addr->sadb_address_len =
3387 (sizeof(struct sadb_address)+sockaddr_size)/
3388 sizeof(uint64_t);
3389 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3390 addr->sadb_address_proto = 0;
3391 addr->sadb_address_reserved = 0;
3392 addr->sadb_address_prefixlen =
3393 pfkey_sockaddr_fill(&x->props.saddr, 0,
3394 (struct sockaddr *) (addr + 1),
3395 x->props.family);
3396 if (!addr->sadb_address_prefixlen)
3397 BUG();
3398
3399 /* NAT_T_SPORT (old port) */
3400 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3401 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3402 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3403 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3404 n_port->sadb_x_nat_t_port_reserved = 0;
3405
3406 /* ADDRESS_DST (new addr) */
3407 addr = (struct sadb_address*)
3408 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3409 addr->sadb_address_len =
3410 (sizeof(struct sadb_address)+sockaddr_size)/
3411 sizeof(uint64_t);
3412 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3413 addr->sadb_address_proto = 0;
3414 addr->sadb_address_reserved = 0;
3415 addr->sadb_address_prefixlen =
3416 pfkey_sockaddr_fill(ipaddr, 0,
3417 (struct sockaddr *) (addr + 1),
3418 x->props.family);
3419 if (!addr->sadb_address_prefixlen)
3420 BUG();
3421
3422 /* NAT_T_DPORT (new port) */
3423 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3424 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3425 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3426 n_port->sadb_x_nat_t_port_port = sport;
3427 n_port->sadb_x_nat_t_port_reserved = 0;
3428
3429 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3430 }
3431
3432 #ifdef CONFIG_NET_KEY_MIGRATE
3433 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3434 const struct xfrm_selector *sel)
3435 {
3436 struct sadb_address *addr;
3437 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3438 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3439 addr->sadb_address_exttype = type;
3440 addr->sadb_address_proto = sel->proto;
3441 addr->sadb_address_reserved = 0;
3442
3443 switch (type) {
3444 case SADB_EXT_ADDRESS_SRC:
3445 addr->sadb_address_prefixlen = sel->prefixlen_s;
3446 pfkey_sockaddr_fill(&sel->saddr, 0,
3447 (struct sockaddr *)(addr + 1),
3448 sel->family);
3449 break;
3450 case SADB_EXT_ADDRESS_DST:
3451 addr->sadb_address_prefixlen = sel->prefixlen_d;
3452 pfkey_sockaddr_fill(&sel->daddr, 0,
3453 (struct sockaddr *)(addr + 1),
3454 sel->family);
3455 break;
3456 default:
3457 return -EINVAL;
3458 }
3459
3460 return 0;
3461 }
3462
3463
3464 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3465 {
3466 struct sadb_x_kmaddress *kma;
3467 u8 *sa;
3468 int family = k->family;
3469 int socklen = pfkey_sockaddr_len(family);
3470 int size_req;
3471
3472 size_req = (sizeof(struct sadb_x_kmaddress) +
3473 pfkey_sockaddr_pair_size(family));
3474
3475 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3476 memset(kma, 0, size_req);
3477 kma->sadb_x_kmaddress_len = size_req / 8;
3478 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3479 kma->sadb_x_kmaddress_reserved = k->reserved;
3480
3481 sa = (u8 *)(kma + 1);
3482 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3483 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3484 return -EINVAL;
3485
3486 return 0;
3487 }
3488
3489 static int set_ipsecrequest(struct sk_buff *skb,
3490 uint8_t proto, uint8_t mode, int level,
3491 uint32_t reqid, uint8_t family,
3492 const xfrm_address_t *src, const xfrm_address_t *dst)
3493 {
3494 struct sadb_x_ipsecrequest *rq;
3495 u8 *sa;
3496 int socklen = pfkey_sockaddr_len(family);
3497 int size_req;
3498
3499 size_req = sizeof(struct sadb_x_ipsecrequest) +
3500 pfkey_sockaddr_pair_size(family);
3501
3502 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3503 memset(rq, 0, size_req);
3504 rq->sadb_x_ipsecrequest_len = size_req;
3505 rq->sadb_x_ipsecrequest_proto = proto;
3506 rq->sadb_x_ipsecrequest_mode = mode;
3507 rq->sadb_x_ipsecrequest_level = level;
3508 rq->sadb_x_ipsecrequest_reqid = reqid;
3509
3510 sa = (u8 *) (rq + 1);
3511 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3512 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3513 return -EINVAL;
3514
3515 return 0;
3516 }
3517 #endif
3518
3519 #ifdef CONFIG_NET_KEY_MIGRATE
3520 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3521 const struct xfrm_migrate *m, int num_bundles,
3522 const struct xfrm_kmaddress *k)
3523 {
3524 int i;
3525 int sasize_sel;
3526 int size = 0;
3527 int size_pol = 0;
3528 struct sk_buff *skb;
3529 struct sadb_msg *hdr;
3530 struct sadb_x_policy *pol;
3531 const struct xfrm_migrate *mp;
3532
3533 if (type != XFRM_POLICY_TYPE_MAIN)
3534 return 0;
3535
3536 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3537 return -EINVAL;
3538
3539 if (k != NULL) {
3540 /* addresses for KM */
3541 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3542 pfkey_sockaddr_pair_size(k->family));
3543 }
3544
3545 /* selector */
3546 sasize_sel = pfkey_sockaddr_size(sel->family);
3547 if (!sasize_sel)
3548 return -EINVAL;
3549 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3550
3551 /* policy info */
3552 size_pol += sizeof(struct sadb_x_policy);
3553
3554 /* ipsecrequests */
3555 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3556 /* old locator pair */
3557 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3558 pfkey_sockaddr_pair_size(mp->old_family);
3559 /* new locator pair */
3560 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3561 pfkey_sockaddr_pair_size(mp->new_family);
3562 }
3563
3564 size += sizeof(struct sadb_msg) + size_pol;
3565
3566 /* alloc buffer */
3567 skb = alloc_skb(size, GFP_ATOMIC);
3568 if (skb == NULL)
3569 return -ENOMEM;
3570
3571 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3572 hdr->sadb_msg_version = PF_KEY_V2;
3573 hdr->sadb_msg_type = SADB_X_MIGRATE;
3574 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3575 hdr->sadb_msg_len = size / 8;
3576 hdr->sadb_msg_errno = 0;
3577 hdr->sadb_msg_reserved = 0;
3578 hdr->sadb_msg_seq = 0;
3579 hdr->sadb_msg_pid = 0;
3580
3581 /* Addresses to be used by KM for negotiation, if ext is available */
3582 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3583 goto err;
3584
3585 /* selector src */
3586 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3587
3588 /* selector dst */
3589 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3590
3591 /* policy information */
3592 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3593 pol->sadb_x_policy_len = size_pol / 8;
3594 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3595 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3596 pol->sadb_x_policy_dir = dir + 1;
3597 pol->sadb_x_policy_reserved = 0;
3598 pol->sadb_x_policy_id = 0;
3599 pol->sadb_x_policy_priority = 0;
3600
3601 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3602 /* old ipsecrequest */
3603 int mode = pfkey_mode_from_xfrm(mp->mode);
3604 if (mode < 0)
3605 goto err;
3606 if (set_ipsecrequest(skb, mp->proto, mode,
3607 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3608 mp->reqid, mp->old_family,
3609 &mp->old_saddr, &mp->old_daddr) < 0)
3610 goto err;
3611
3612 /* new ipsecrequest */
3613 if (set_ipsecrequest(skb, mp->proto, mode,
3614 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3615 mp->reqid, mp->new_family,
3616 &mp->new_saddr, &mp->new_daddr) < 0)
3617 goto err;
3618 }
3619
3620 /* broadcast migrate message to sockets */
3621 pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3622
3623 return 0;
3624
3625 err:
3626 kfree_skb(skb);
3627 return -EINVAL;
3628 }
3629 #else
3630 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3631 const struct xfrm_migrate *m, int num_bundles,
3632 const struct xfrm_kmaddress *k)
3633 {
3634 return -ENOPROTOOPT;
3635 }
3636 #endif
3637
3638 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3639 {
3640 struct sock *sk = sock->sk;
3641 struct sk_buff *skb = NULL;
3642 struct sadb_msg *hdr = NULL;
3643 int err;
3644 struct net *net = sock_net(sk);
3645
3646 err = -EOPNOTSUPP;
3647 if (msg->msg_flags & MSG_OOB)
3648 goto out;
3649
3650 err = -EMSGSIZE;
3651 if ((unsigned int)len > sk->sk_sndbuf - 32)
3652 goto out;
3653
3654 err = -ENOBUFS;
3655 skb = alloc_skb(len, GFP_KERNEL);
3656 if (skb == NULL)
3657 goto out;
3658
3659 err = -EFAULT;
3660 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3661 goto out;
3662
3663 hdr = pfkey_get_base_msg(skb, &err);
3664 if (!hdr)
3665 goto out;
3666
3667 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3668 err = pfkey_process(sk, skb, hdr);
3669 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3670
3671 out:
3672 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3673 err = 0;
3674 kfree_skb(skb);
3675
3676 return err ? : len;
3677 }
3678
3679 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3680 int flags)
3681 {
3682 struct sock *sk = sock->sk;
3683 struct pfkey_sock *pfk = pfkey_sk(sk);
3684 struct sk_buff *skb;
3685 int copied, err;
3686
3687 err = -EINVAL;
3688 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3689 goto out;
3690
3691 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3692 if (skb == NULL)
3693 goto out;
3694
3695 copied = skb->len;
3696 if (copied > len) {
3697 msg->msg_flags |= MSG_TRUNC;
3698 copied = len;
3699 }
3700
3701 skb_reset_transport_header(skb);
3702 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3703 if (err)
3704 goto out_free;
3705
3706 sock_recv_ts_and_drops(msg, sk, skb);
3707
3708 err = (flags & MSG_TRUNC) ? skb->len : copied;
3709
3710 if (pfk->dump.dump != NULL &&
3711 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3712 pfkey_do_dump(pfk);
3713
3714 out_free:
3715 skb_free_datagram(sk, skb);
3716 out:
3717 return err;
3718 }
3719
3720 static const struct proto_ops pfkey_ops = {
3721 .family = PF_KEY,
3722 .owner = THIS_MODULE,
3723 /* Operations that make no sense on pfkey sockets. */
3724 .bind = sock_no_bind,
3725 .connect = sock_no_connect,
3726 .socketpair = sock_no_socketpair,
3727 .accept = sock_no_accept,
3728 .getname = sock_no_getname,
3729 .ioctl = sock_no_ioctl,
3730 .listen = sock_no_listen,
3731 .shutdown = sock_no_shutdown,
3732 .setsockopt = sock_no_setsockopt,
3733 .getsockopt = sock_no_getsockopt,
3734 .mmap = sock_no_mmap,
3735 .sendpage = sock_no_sendpage,
3736
3737 /* Now the operations that really occur. */
3738 .release = pfkey_release,
3739 .poll = datagram_poll,
3740 .sendmsg = pfkey_sendmsg,
3741 .recvmsg = pfkey_recvmsg,
3742 };
3743
3744 static const struct net_proto_family pfkey_family_ops = {
3745 .family = PF_KEY,
3746 .create = pfkey_create,
3747 .owner = THIS_MODULE,
3748 };
3749
3750 #ifdef CONFIG_PROC_FS
3751 static int pfkey_seq_show(struct seq_file *f, void *v)
3752 {
3753 struct sock *s = sk_entry(v);
3754
3755 if (v == SEQ_START_TOKEN)
3756 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3757 else
3758 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3759 s,
3760 atomic_read(&s->sk_refcnt),
3761 sk_rmem_alloc_get(s),
3762 sk_wmem_alloc_get(s),
3763 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3764 sock_i_ino(s)
3765 );
3766 return 0;
3767 }
3768
3769 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3770 __acquires(rcu)
3771 {
3772 struct net *net = seq_file_net(f);
3773 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3774
3775 rcu_read_lock();
3776 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3777 }
3778
3779 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3780 {
3781 struct net *net = seq_file_net(f);
3782 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3783
3784 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3785 }
3786
3787 static void pfkey_seq_stop(struct seq_file *f, void *v)
3788 __releases(rcu)
3789 {
3790 rcu_read_unlock();
3791 }
3792
3793 static const struct seq_operations pfkey_seq_ops = {
3794 .start = pfkey_seq_start,
3795 .next = pfkey_seq_next,
3796 .stop = pfkey_seq_stop,
3797 .show = pfkey_seq_show,
3798 };
3799
3800 static int pfkey_seq_open(struct inode *inode, struct file *file)
3801 {
3802 return seq_open_net(inode, file, &pfkey_seq_ops,
3803 sizeof(struct seq_net_private));
3804 }
3805
3806 static const struct file_operations pfkey_proc_ops = {
3807 .open = pfkey_seq_open,
3808 .read = seq_read,
3809 .llseek = seq_lseek,
3810 .release = seq_release_net,
3811 };
3812
3813 static int __net_init pfkey_init_proc(struct net *net)
3814 {
3815 struct proc_dir_entry *e;
3816
3817 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3818 if (e == NULL)
3819 return -ENOMEM;
3820
3821 return 0;
3822 }
3823
3824 static void __net_exit pfkey_exit_proc(struct net *net)
3825 {
3826 remove_proc_entry("pfkey", net->proc_net);
3827 }
3828 #else
3829 static inline int pfkey_init_proc(struct net *net)
3830 {
3831 return 0;
3832 }
3833
3834 static inline void pfkey_exit_proc(struct net *net)
3835 {
3836 }
3837 #endif
3838
3839 static struct xfrm_mgr pfkeyv2_mgr =
3840 {
3841 .notify = pfkey_send_notify,
3842 .acquire = pfkey_send_acquire,
3843 .compile_policy = pfkey_compile_policy,
3844 .new_mapping = pfkey_send_new_mapping,
3845 .notify_policy = pfkey_send_policy_notify,
3846 .migrate = pfkey_send_migrate,
3847 .is_alive = pfkey_is_alive,
3848 };
3849
3850 static int __net_init pfkey_net_init(struct net *net)
3851 {
3852 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3853 int rv;
3854
3855 INIT_HLIST_HEAD(&net_pfkey->table);
3856 atomic_set(&net_pfkey->socks_nr, 0);
3857
3858 rv = pfkey_init_proc(net);
3859
3860 return rv;
3861 }
3862
3863 static void __net_exit pfkey_net_exit(struct net *net)
3864 {
3865 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3866
3867 pfkey_exit_proc(net);
3868 BUG_ON(!hlist_empty(&net_pfkey->table));
3869 }
3870
3871 static struct pernet_operations pfkey_net_ops = {
3872 .init = pfkey_net_init,
3873 .exit = pfkey_net_exit,
3874 .id = &pfkey_net_id,
3875 .size = sizeof(struct netns_pfkey),
3876 };
3877
3878 static void __exit ipsec_pfkey_exit(void)
3879 {
3880 xfrm_unregister_km(&pfkeyv2_mgr);
3881 sock_unregister(PF_KEY);
3882 unregister_pernet_subsys(&pfkey_net_ops);
3883 proto_unregister(&key_proto);
3884 }
3885
3886 static int __init ipsec_pfkey_init(void)
3887 {
3888 int err = proto_register(&key_proto, 0);
3889
3890 if (err != 0)
3891 goto out;
3892
3893 err = register_pernet_subsys(&pfkey_net_ops);
3894 if (err != 0)
3895 goto out_unregister_key_proto;
3896 err = sock_register(&pfkey_family_ops);
3897 if (err != 0)
3898 goto out_unregister_pernet;
3899 err = xfrm_register_km(&pfkeyv2_mgr);
3900 if (err != 0)
3901 goto out_sock_unregister;
3902 out:
3903 return err;
3904
3905 out_sock_unregister:
3906 sock_unregister(PF_KEY);
3907 out_unregister_pernet:
3908 unregister_pernet_subsys(&pfkey_net_ops);
3909 out_unregister_key_proto:
3910 proto_unregister(&key_proto);
3911 goto out;
3912 }
3913
3914 module_init(ipsec_pfkey_init);
3915 module_exit(ipsec_pfkey_exit);
3916 MODULE_LICENSE("GPL");
3917 MODULE_ALIAS_NETPROTO(PF_KEY);
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