]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/key/af_key.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[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(refcount_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 (refcount_read(&skb->users) != 1) {
207 *skb2 = skb_clone(skb, allocation);
208 } else {
209 *skb2 = skb;
210 refcount_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, gfp_t allocation,
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, allocation, 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, GFP_ATOMIC, 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 = 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, GFP_KERNEL, 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 = 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 = 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 = skb_put(skb, sizeof(struct sadb_lifetime));
866 lifetime->sadb_lifetime_len =
867 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
868 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
869 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
870 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
871 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
872 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
873 }
874 /* soft time */
875 if (hsc & 1) {
876 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
877 lifetime->sadb_lifetime_len =
878 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
879 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
880 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
881 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
882 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
883 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
884 }
885 /* current time */
886 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
887 lifetime->sadb_lifetime_len =
888 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
889 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
890 lifetime->sadb_lifetime_allocations = x->curlft.packets;
891 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
892 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
893 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
894 /* src address */
895 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
896 addr->sadb_address_len =
897 (sizeof(struct sadb_address)+sockaddr_size)/
898 sizeof(uint64_t);
899 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
900 /* "if the ports are non-zero, then the sadb_address_proto field,
901 normally zero, MUST be filled in with the transport
902 protocol's number." - RFC2367 */
903 addr->sadb_address_proto = 0;
904 addr->sadb_address_reserved = 0;
905
906 addr->sadb_address_prefixlen =
907 pfkey_sockaddr_fill(&x->props.saddr, 0,
908 (struct sockaddr *) (addr + 1),
909 x->props.family);
910 if (!addr->sadb_address_prefixlen)
911 BUG();
912
913 /* dst address */
914 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
915 addr->sadb_address_len =
916 (sizeof(struct sadb_address)+sockaddr_size)/
917 sizeof(uint64_t);
918 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
919 addr->sadb_address_proto = 0;
920 addr->sadb_address_reserved = 0;
921
922 addr->sadb_address_prefixlen =
923 pfkey_sockaddr_fill(&x->id.daddr, 0,
924 (struct sockaddr *) (addr + 1),
925 x->props.family);
926 if (!addr->sadb_address_prefixlen)
927 BUG();
928
929 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
930 x->props.family)) {
931 addr = skb_put(skb,
932 sizeof(struct sadb_address) + sockaddr_size);
933 addr->sadb_address_len =
934 (sizeof(struct sadb_address)+sockaddr_size)/
935 sizeof(uint64_t);
936 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
937 addr->sadb_address_proto =
938 pfkey_proto_from_xfrm(x->sel.proto);
939 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
940 addr->sadb_address_reserved = 0;
941
942 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
943 (struct sockaddr *) (addr + 1),
944 x->props.family);
945 }
946
947 /* auth key */
948 if (add_keys && auth_key_size) {
949 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
950 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
951 sizeof(uint64_t);
952 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
953 key->sadb_key_bits = x->aalg->alg_key_len;
954 key->sadb_key_reserved = 0;
955 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
956 }
957 /* encrypt key */
958 if (add_keys && encrypt_key_size) {
959 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
960 key->sadb_key_len = (sizeof(struct sadb_key) +
961 encrypt_key_size) / sizeof(uint64_t);
962 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
963 key->sadb_key_bits = x->ealg->alg_key_len;
964 key->sadb_key_reserved = 0;
965 memcpy(key + 1, x->ealg->alg_key,
966 (x->ealg->alg_key_len+7)/8);
967 }
968
969 /* sa */
970 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
971 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
972 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
973 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
974 kfree_skb(skb);
975 return ERR_PTR(-EINVAL);
976 }
977 sa2->sadb_x_sa2_mode = mode;
978 sa2->sadb_x_sa2_reserved1 = 0;
979 sa2->sadb_x_sa2_reserved2 = 0;
980 sa2->sadb_x_sa2_sequence = 0;
981 sa2->sadb_x_sa2_reqid = x->props.reqid;
982
983 if (natt && natt->encap_type) {
984 struct sadb_x_nat_t_type *n_type;
985 struct sadb_x_nat_t_port *n_port;
986
987 /* type */
988 n_type = skb_put(skb, sizeof(*n_type));
989 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
990 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
991 n_type->sadb_x_nat_t_type_type = natt->encap_type;
992 n_type->sadb_x_nat_t_type_reserved[0] = 0;
993 n_type->sadb_x_nat_t_type_reserved[1] = 0;
994 n_type->sadb_x_nat_t_type_reserved[2] = 0;
995
996 /* source port */
997 n_port = skb_put(skb, sizeof(*n_port));
998 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
999 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1000 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1001 n_port->sadb_x_nat_t_port_reserved = 0;
1002
1003 /* dest port */
1004 n_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_DPORT;
1007 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1008 n_port->sadb_x_nat_t_port_reserved = 0;
1009 }
1010
1011 /* security context */
1012 if (xfrm_ctx) {
1013 sec_ctx = skb_put(skb,
1014 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1015 sec_ctx->sadb_x_sec_len =
1016 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1017 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1018 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1019 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1020 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1021 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1022 xfrm_ctx->ctx_len);
1023 }
1024
1025 return skb;
1026 }
1027
1028
1029 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1030 {
1031 struct sk_buff *skb;
1032
1033 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1034
1035 return skb;
1036 }
1037
1038 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1039 int hsc)
1040 {
1041 return __pfkey_xfrm_state2msg(x, 0, hsc);
1042 }
1043
1044 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1045 const struct sadb_msg *hdr,
1046 void * const *ext_hdrs)
1047 {
1048 struct xfrm_state *x;
1049 const struct sadb_lifetime *lifetime;
1050 const struct sadb_sa *sa;
1051 const struct sadb_key *key;
1052 const struct sadb_x_sec_ctx *sec_ctx;
1053 uint16_t proto;
1054 int err;
1055
1056
1057 sa = ext_hdrs[SADB_EXT_SA - 1];
1058 if (!sa ||
1059 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1060 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1061 return ERR_PTR(-EINVAL);
1062 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1063 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1064 return ERR_PTR(-EINVAL);
1065 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1066 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1067 return ERR_PTR(-EINVAL);
1068 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1069 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1070 return ERR_PTR(-EINVAL);
1071
1072 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1073 if (proto == 0)
1074 return ERR_PTR(-EINVAL);
1075
1076 /* default error is no buffer space */
1077 err = -ENOBUFS;
1078
1079 /* RFC2367:
1080
1081 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1082 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1083 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1084 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1085 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1086 not true.
1087
1088 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1089 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1090 */
1091 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1092 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1093 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1094 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1095 return ERR_PTR(-EINVAL);
1096 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1097 if (key != NULL &&
1098 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1099 ((key->sadb_key_bits+7) / 8 == 0 ||
1100 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1101 return ERR_PTR(-EINVAL);
1102 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1103 if (key != NULL &&
1104 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1105 ((key->sadb_key_bits+7) / 8 == 0 ||
1106 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1107 return ERR_PTR(-EINVAL);
1108
1109 x = xfrm_state_alloc(net);
1110 if (x == NULL)
1111 return ERR_PTR(-ENOBUFS);
1112
1113 x->id.proto = proto;
1114 x->id.spi = sa->sadb_sa_spi;
1115 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1116 (sizeof(x->replay.bitmap) * 8));
1117 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1118 x->props.flags |= XFRM_STATE_NOECN;
1119 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1120 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1121 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1122 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1123
1124 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1125 if (lifetime != NULL) {
1126 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1127 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1128 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1129 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1130 }
1131 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1132 if (lifetime != NULL) {
1133 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1134 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1135 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1136 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1137 }
1138
1139 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1140 if (sec_ctx != NULL) {
1141 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1142
1143 if (!uctx)
1144 goto out;
1145
1146 err = security_xfrm_state_alloc(x, uctx);
1147 kfree(uctx);
1148
1149 if (err)
1150 goto out;
1151 }
1152
1153 err = -ENOBUFS;
1154 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1155 if (sa->sadb_sa_auth) {
1156 int keysize = 0;
1157 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1158 if (!a || !a->pfkey_supported) {
1159 err = -ENOSYS;
1160 goto out;
1161 }
1162 if (key)
1163 keysize = (key->sadb_key_bits + 7) / 8;
1164 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1165 if (!x->aalg) {
1166 err = -ENOMEM;
1167 goto out;
1168 }
1169 strcpy(x->aalg->alg_name, a->name);
1170 x->aalg->alg_key_len = 0;
1171 if (key) {
1172 x->aalg->alg_key_len = key->sadb_key_bits;
1173 memcpy(x->aalg->alg_key, key+1, keysize);
1174 }
1175 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1176 x->props.aalgo = sa->sadb_sa_auth;
1177 /* x->algo.flags = sa->sadb_sa_flags; */
1178 }
1179 if (sa->sadb_sa_encrypt) {
1180 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1181 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1182 if (!a || !a->pfkey_supported) {
1183 err = -ENOSYS;
1184 goto out;
1185 }
1186 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1187 if (!x->calg) {
1188 err = -ENOMEM;
1189 goto out;
1190 }
1191 strcpy(x->calg->alg_name, a->name);
1192 x->props.calgo = sa->sadb_sa_encrypt;
1193 } else {
1194 int keysize = 0;
1195 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1196 if (!a || !a->pfkey_supported) {
1197 err = -ENOSYS;
1198 goto out;
1199 }
1200 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1201 if (key)
1202 keysize = (key->sadb_key_bits + 7) / 8;
1203 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1204 if (!x->ealg) {
1205 err = -ENOMEM;
1206 goto out;
1207 }
1208 strcpy(x->ealg->alg_name, a->name);
1209 x->ealg->alg_key_len = 0;
1210 if (key) {
1211 x->ealg->alg_key_len = key->sadb_key_bits;
1212 memcpy(x->ealg->alg_key, key+1, keysize);
1213 }
1214 x->props.ealgo = sa->sadb_sa_encrypt;
1215 x->geniv = a->uinfo.encr.geniv;
1216 }
1217 }
1218 /* x->algo.flags = sa->sadb_sa_flags; */
1219
1220 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1221 &x->props.saddr);
1222 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1223 &x->id.daddr);
1224
1225 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1226 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1227 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1228 if (mode < 0) {
1229 err = -EINVAL;
1230 goto out;
1231 }
1232 x->props.mode = mode;
1233 x->props.reqid = sa2->sadb_x_sa2_reqid;
1234 }
1235
1236 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1237 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1238
1239 /* Nobody uses this, but we try. */
1240 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1241 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1242 }
1243
1244 if (!x->sel.family)
1245 x->sel.family = x->props.family;
1246
1247 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1248 const struct sadb_x_nat_t_type* n_type;
1249 struct xfrm_encap_tmpl *natt;
1250
1251 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1252 if (!x->encap) {
1253 err = -ENOMEM;
1254 goto out;
1255 }
1256
1257 natt = x->encap;
1258 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1259 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1260
1261 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1262 const struct sadb_x_nat_t_port *n_port =
1263 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1264 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1265 }
1266 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1267 const struct sadb_x_nat_t_port *n_port =
1268 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1269 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1270 }
1271 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1272 }
1273
1274 err = xfrm_init_state(x);
1275 if (err)
1276 goto out;
1277
1278 x->km.seq = hdr->sadb_msg_seq;
1279 return x;
1280
1281 out:
1282 x->km.state = XFRM_STATE_DEAD;
1283 xfrm_state_put(x);
1284 return ERR_PTR(err);
1285 }
1286
1287 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1288 {
1289 return -EOPNOTSUPP;
1290 }
1291
1292 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1293 {
1294 struct net *net = sock_net(sk);
1295 struct sk_buff *resp_skb;
1296 struct sadb_x_sa2 *sa2;
1297 struct sadb_address *saddr, *daddr;
1298 struct sadb_msg *out_hdr;
1299 struct sadb_spirange *range;
1300 struct xfrm_state *x = NULL;
1301 int mode;
1302 int err;
1303 u32 min_spi, max_spi;
1304 u32 reqid;
1305 u8 proto;
1306 unsigned short family;
1307 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1308
1309 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1310 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1311 return -EINVAL;
1312
1313 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1314 if (proto == 0)
1315 return -EINVAL;
1316
1317 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1318 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1319 if (mode < 0)
1320 return -EINVAL;
1321 reqid = sa2->sadb_x_sa2_reqid;
1322 } else {
1323 mode = 0;
1324 reqid = 0;
1325 }
1326
1327 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1328 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1329
1330 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1331 switch (family) {
1332 case AF_INET:
1333 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1334 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1335 break;
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 case AF_INET6:
1338 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1339 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1340 break;
1341 #endif
1342 }
1343
1344 if (hdr->sadb_msg_seq) {
1345 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1346 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1347 xfrm_state_put(x);
1348 x = NULL;
1349 }
1350 }
1351
1352 if (!x)
1353 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1354
1355 if (x == NULL)
1356 return -ENOENT;
1357
1358 min_spi = 0x100;
1359 max_spi = 0x0fffffff;
1360
1361 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1362 if (range) {
1363 min_spi = range->sadb_spirange_min;
1364 max_spi = range->sadb_spirange_max;
1365 }
1366
1367 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1368 if (err) {
1369 xfrm_state_put(x);
1370 return err;
1371 }
1372
1373 err = xfrm_alloc_spi(x, min_spi, max_spi);
1374 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1375
1376 if (IS_ERR(resp_skb)) {
1377 xfrm_state_put(x);
1378 return PTR_ERR(resp_skb);
1379 }
1380
1381 out_hdr = (struct sadb_msg *) resp_skb->data;
1382 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1383 out_hdr->sadb_msg_type = SADB_GETSPI;
1384 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1385 out_hdr->sadb_msg_errno = 0;
1386 out_hdr->sadb_msg_reserved = 0;
1387 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1388 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1389
1390 xfrm_state_put(x);
1391
1392 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1393
1394 return 0;
1395 }
1396
1397 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1398 {
1399 struct net *net = sock_net(sk);
1400 struct xfrm_state *x;
1401
1402 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1403 return -EOPNOTSUPP;
1404
1405 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1406 return 0;
1407
1408 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1409 if (x == NULL)
1410 return 0;
1411
1412 spin_lock_bh(&x->lock);
1413 if (x->km.state == XFRM_STATE_ACQ)
1414 x->km.state = XFRM_STATE_ERROR;
1415
1416 spin_unlock_bh(&x->lock);
1417 xfrm_state_put(x);
1418 return 0;
1419 }
1420
1421 static inline int event2poltype(int event)
1422 {
1423 switch (event) {
1424 case XFRM_MSG_DELPOLICY:
1425 return SADB_X_SPDDELETE;
1426 case XFRM_MSG_NEWPOLICY:
1427 return SADB_X_SPDADD;
1428 case XFRM_MSG_UPDPOLICY:
1429 return SADB_X_SPDUPDATE;
1430 case XFRM_MSG_POLEXPIRE:
1431 // return SADB_X_SPDEXPIRE;
1432 default:
1433 pr_err("pfkey: Unknown policy event %d\n", event);
1434 break;
1435 }
1436
1437 return 0;
1438 }
1439
1440 static inline int event2keytype(int event)
1441 {
1442 switch (event) {
1443 case XFRM_MSG_DELSA:
1444 return SADB_DELETE;
1445 case XFRM_MSG_NEWSA:
1446 return SADB_ADD;
1447 case XFRM_MSG_UPDSA:
1448 return SADB_UPDATE;
1449 case XFRM_MSG_EXPIRE:
1450 return SADB_EXPIRE;
1451 default:
1452 pr_err("pfkey: Unknown SA event %d\n", event);
1453 break;
1454 }
1455
1456 return 0;
1457 }
1458
1459 /* ADD/UPD/DEL */
1460 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1461 {
1462 struct sk_buff *skb;
1463 struct sadb_msg *hdr;
1464
1465 skb = pfkey_xfrm_state2msg(x);
1466
1467 if (IS_ERR(skb))
1468 return PTR_ERR(skb);
1469
1470 hdr = (struct sadb_msg *) skb->data;
1471 hdr->sadb_msg_version = PF_KEY_V2;
1472 hdr->sadb_msg_type = event2keytype(c->event);
1473 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1474 hdr->sadb_msg_errno = 0;
1475 hdr->sadb_msg_reserved = 0;
1476 hdr->sadb_msg_seq = c->seq;
1477 hdr->sadb_msg_pid = c->portid;
1478
1479 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1480
1481 return 0;
1482 }
1483
1484 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1485 {
1486 struct net *net = sock_net(sk);
1487 struct xfrm_state *x;
1488 int err;
1489 struct km_event c;
1490
1491 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1492 if (IS_ERR(x))
1493 return PTR_ERR(x);
1494
1495 xfrm_state_hold(x);
1496 if (hdr->sadb_msg_type == SADB_ADD)
1497 err = xfrm_state_add(x);
1498 else
1499 err = xfrm_state_update(x);
1500
1501 xfrm_audit_state_add(x, err ? 0 : 1, true);
1502
1503 if (err < 0) {
1504 x->km.state = XFRM_STATE_DEAD;
1505 __xfrm_state_put(x);
1506 goto out;
1507 }
1508
1509 if (hdr->sadb_msg_type == SADB_ADD)
1510 c.event = XFRM_MSG_NEWSA;
1511 else
1512 c.event = XFRM_MSG_UPDSA;
1513 c.seq = hdr->sadb_msg_seq;
1514 c.portid = hdr->sadb_msg_pid;
1515 km_state_notify(x, &c);
1516 out:
1517 xfrm_state_put(x);
1518 return err;
1519 }
1520
1521 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1522 {
1523 struct net *net = sock_net(sk);
1524 struct xfrm_state *x;
1525 struct km_event c;
1526 int err;
1527
1528 if (!ext_hdrs[SADB_EXT_SA-1] ||
1529 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1530 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1531 return -EINVAL;
1532
1533 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1534 if (x == NULL)
1535 return -ESRCH;
1536
1537 if ((err = security_xfrm_state_delete(x)))
1538 goto out;
1539
1540 if (xfrm_state_kern(x)) {
1541 err = -EPERM;
1542 goto out;
1543 }
1544
1545 err = xfrm_state_delete(x);
1546
1547 if (err < 0)
1548 goto out;
1549
1550 c.seq = hdr->sadb_msg_seq;
1551 c.portid = hdr->sadb_msg_pid;
1552 c.event = XFRM_MSG_DELSA;
1553 km_state_notify(x, &c);
1554 out:
1555 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1556 xfrm_state_put(x);
1557
1558 return err;
1559 }
1560
1561 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1562 {
1563 struct net *net = sock_net(sk);
1564 __u8 proto;
1565 struct sk_buff *out_skb;
1566 struct sadb_msg *out_hdr;
1567 struct xfrm_state *x;
1568
1569 if (!ext_hdrs[SADB_EXT_SA-1] ||
1570 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1571 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1572 return -EINVAL;
1573
1574 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1575 if (x == NULL)
1576 return -ESRCH;
1577
1578 out_skb = pfkey_xfrm_state2msg(x);
1579 proto = x->id.proto;
1580 xfrm_state_put(x);
1581 if (IS_ERR(out_skb))
1582 return PTR_ERR(out_skb);
1583
1584 out_hdr = (struct sadb_msg *) out_skb->data;
1585 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1586 out_hdr->sadb_msg_type = SADB_GET;
1587 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1588 out_hdr->sadb_msg_errno = 0;
1589 out_hdr->sadb_msg_reserved = 0;
1590 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1591 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1592 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1593
1594 return 0;
1595 }
1596
1597 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1598 gfp_t allocation)
1599 {
1600 struct sk_buff *skb;
1601 struct sadb_msg *hdr;
1602 int len, auth_len, enc_len, i;
1603
1604 auth_len = xfrm_count_pfkey_auth_supported();
1605 if (auth_len) {
1606 auth_len *= sizeof(struct sadb_alg);
1607 auth_len += sizeof(struct sadb_supported);
1608 }
1609
1610 enc_len = xfrm_count_pfkey_enc_supported();
1611 if (enc_len) {
1612 enc_len *= sizeof(struct sadb_alg);
1613 enc_len += sizeof(struct sadb_supported);
1614 }
1615
1616 len = enc_len + auth_len + sizeof(struct sadb_msg);
1617
1618 skb = alloc_skb(len + 16, allocation);
1619 if (!skb)
1620 goto out_put_algs;
1621
1622 hdr = skb_put(skb, sizeof(*hdr));
1623 pfkey_hdr_dup(hdr, orig);
1624 hdr->sadb_msg_errno = 0;
1625 hdr->sadb_msg_len = len / sizeof(uint64_t);
1626
1627 if (auth_len) {
1628 struct sadb_supported *sp;
1629 struct sadb_alg *ap;
1630
1631 sp = skb_put(skb, auth_len);
1632 ap = (struct sadb_alg *) (sp + 1);
1633
1634 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1635 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1636
1637 for (i = 0; ; i++) {
1638 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1639 if (!aalg)
1640 break;
1641 if (!aalg->pfkey_supported)
1642 continue;
1643 if (aalg->available)
1644 *ap++ = aalg->desc;
1645 }
1646 }
1647
1648 if (enc_len) {
1649 struct sadb_supported *sp;
1650 struct sadb_alg *ap;
1651
1652 sp = skb_put(skb, enc_len);
1653 ap = (struct sadb_alg *) (sp + 1);
1654
1655 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1656 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1657
1658 for (i = 0; ; i++) {
1659 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1660 if (!ealg)
1661 break;
1662 if (!ealg->pfkey_supported)
1663 continue;
1664 if (ealg->available)
1665 *ap++ = ealg->desc;
1666 }
1667 }
1668
1669 out_put_algs:
1670 return skb;
1671 }
1672
1673 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1674 {
1675 struct pfkey_sock *pfk = pfkey_sk(sk);
1676 struct sk_buff *supp_skb;
1677
1678 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1679 return -EINVAL;
1680
1681 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1682 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1683 return -EEXIST;
1684 pfk->registered |= (1<<hdr->sadb_msg_satype);
1685 }
1686
1687 xfrm_probe_algs();
1688
1689 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1690 if (!supp_skb) {
1691 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1692 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1693
1694 return -ENOBUFS;
1695 }
1696
1697 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1698 sock_net(sk));
1699 return 0;
1700 }
1701
1702 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1703 {
1704 struct sk_buff *skb;
1705 struct sadb_msg *hdr;
1706
1707 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1708 if (!skb)
1709 return -ENOBUFS;
1710
1711 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1712 hdr->sadb_msg_errno = (uint8_t) 0;
1713 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1714
1715 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1716 sock_net(sk));
1717 }
1718
1719 static int key_notify_sa_flush(const struct km_event *c)
1720 {
1721 struct sk_buff *skb;
1722 struct sadb_msg *hdr;
1723
1724 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1725 if (!skb)
1726 return -ENOBUFS;
1727 hdr = skb_put(skb, sizeof(struct sadb_msg));
1728 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1729 hdr->sadb_msg_type = SADB_FLUSH;
1730 hdr->sadb_msg_seq = c->seq;
1731 hdr->sadb_msg_pid = c->portid;
1732 hdr->sadb_msg_version = PF_KEY_V2;
1733 hdr->sadb_msg_errno = (uint8_t) 0;
1734 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1735 hdr->sadb_msg_reserved = 0;
1736
1737 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1738
1739 return 0;
1740 }
1741
1742 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1743 {
1744 struct net *net = sock_net(sk);
1745 unsigned int proto;
1746 struct km_event c;
1747 int err, err2;
1748
1749 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1750 if (proto == 0)
1751 return -EINVAL;
1752
1753 err = xfrm_state_flush(net, proto, true);
1754 err2 = unicast_flush_resp(sk, hdr);
1755 if (err || err2) {
1756 if (err == -ESRCH) /* empty table - go quietly */
1757 err = 0;
1758 return err ? err : err2;
1759 }
1760
1761 c.data.proto = proto;
1762 c.seq = hdr->sadb_msg_seq;
1763 c.portid = hdr->sadb_msg_pid;
1764 c.event = XFRM_MSG_FLUSHSA;
1765 c.net = net;
1766 km_state_notify(NULL, &c);
1767
1768 return 0;
1769 }
1770
1771 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1772 {
1773 struct pfkey_sock *pfk = ptr;
1774 struct sk_buff *out_skb;
1775 struct sadb_msg *out_hdr;
1776
1777 if (!pfkey_can_dump(&pfk->sk))
1778 return -ENOBUFS;
1779
1780 out_skb = pfkey_xfrm_state2msg(x);
1781 if (IS_ERR(out_skb))
1782 return PTR_ERR(out_skb);
1783
1784 out_hdr = (struct sadb_msg *) out_skb->data;
1785 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1786 out_hdr->sadb_msg_type = SADB_DUMP;
1787 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1788 out_hdr->sadb_msg_errno = 0;
1789 out_hdr->sadb_msg_reserved = 0;
1790 out_hdr->sadb_msg_seq = count + 1;
1791 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1792
1793 if (pfk->dump.skb)
1794 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1795 &pfk->sk, sock_net(&pfk->sk));
1796 pfk->dump.skb = out_skb;
1797
1798 return 0;
1799 }
1800
1801 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1802 {
1803 struct net *net = sock_net(&pfk->sk);
1804 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1805 }
1806
1807 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1808 {
1809 struct net *net = sock_net(&pfk->sk);
1810
1811 xfrm_state_walk_done(&pfk->dump.u.state, net);
1812 }
1813
1814 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1815 {
1816 u8 proto;
1817 struct xfrm_address_filter *filter = NULL;
1818 struct pfkey_sock *pfk = pfkey_sk(sk);
1819
1820 mutex_lock(&pfk->dump_lock);
1821 if (pfk->dump.dump != NULL) {
1822 mutex_unlock(&pfk->dump_lock);
1823 return -EBUSY;
1824 }
1825
1826 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1827 if (proto == 0) {
1828 mutex_unlock(&pfk->dump_lock);
1829 return -EINVAL;
1830 }
1831
1832 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1833 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1834
1835 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1836 if (filter == NULL) {
1837 mutex_unlock(&pfk->dump_lock);
1838 return -ENOMEM;
1839 }
1840
1841 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1842 sizeof(xfrm_address_t));
1843 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1844 sizeof(xfrm_address_t));
1845 filter->family = xfilter->sadb_x_filter_family;
1846 filter->splen = xfilter->sadb_x_filter_splen;
1847 filter->dplen = xfilter->sadb_x_filter_dplen;
1848 }
1849
1850 pfk->dump.msg_version = hdr->sadb_msg_version;
1851 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1852 pfk->dump.dump = pfkey_dump_sa;
1853 pfk->dump.done = pfkey_dump_sa_done;
1854 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1855 mutex_unlock(&pfk->dump_lock);
1856
1857 return pfkey_do_dump(pfk);
1858 }
1859
1860 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1861 {
1862 struct pfkey_sock *pfk = pfkey_sk(sk);
1863 int satype = hdr->sadb_msg_satype;
1864 bool reset_errno = false;
1865
1866 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1867 reset_errno = true;
1868 if (satype != 0 && satype != 1)
1869 return -EINVAL;
1870 pfk->promisc = satype;
1871 }
1872 if (reset_errno && skb_cloned(skb))
1873 skb = skb_copy(skb, GFP_KERNEL);
1874 else
1875 skb = skb_clone(skb, GFP_KERNEL);
1876
1877 if (reset_errno && skb) {
1878 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1879 new_hdr->sadb_msg_errno = 0;
1880 }
1881
1882 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1883 return 0;
1884 }
1885
1886 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1887 {
1888 int i;
1889 u32 reqid = *(u32*)ptr;
1890
1891 for (i=0; i<xp->xfrm_nr; i++) {
1892 if (xp->xfrm_vec[i].reqid == reqid)
1893 return -EEXIST;
1894 }
1895 return 0;
1896 }
1897
1898 static u32 gen_reqid(struct net *net)
1899 {
1900 struct xfrm_policy_walk walk;
1901 u32 start;
1902 int rc;
1903 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1904
1905 start = reqid;
1906 do {
1907 ++reqid;
1908 if (reqid == 0)
1909 reqid = IPSEC_MANUAL_REQID_MAX+1;
1910 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1911 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1912 xfrm_policy_walk_done(&walk, net);
1913 if (rc != -EEXIST)
1914 return reqid;
1915 } while (reqid != start);
1916 return 0;
1917 }
1918
1919 static int
1920 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1921 {
1922 struct net *net = xp_net(xp);
1923 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1924 int mode;
1925
1926 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1927 return -ELOOP;
1928
1929 if (rq->sadb_x_ipsecrequest_mode == 0)
1930 return -EINVAL;
1931
1932 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1933 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1934 return -EINVAL;
1935 t->mode = mode;
1936 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1937 t->optional = 1;
1938 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1939 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1940 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1941 t->reqid = 0;
1942 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1943 return -ENOBUFS;
1944 }
1945
1946 /* addresses present only in tunnel mode */
1947 if (t->mode == XFRM_MODE_TUNNEL) {
1948 int err;
1949
1950 err = parse_sockaddr_pair(
1951 (struct sockaddr *)(rq + 1),
1952 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1953 &t->saddr, &t->id.daddr, &t->encap_family);
1954 if (err)
1955 return err;
1956 } else
1957 t->encap_family = xp->family;
1958
1959 /* No way to set this via kame pfkey */
1960 t->allalgs = 1;
1961 xp->xfrm_nr++;
1962 return 0;
1963 }
1964
1965 static int
1966 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1967 {
1968 int err;
1969 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1970 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1971
1972 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1973 return -EINVAL;
1974
1975 while (len >= sizeof(*rq)) {
1976 if (len < rq->sadb_x_ipsecrequest_len ||
1977 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1978 return -EINVAL;
1979
1980 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1981 return err;
1982 len -= rq->sadb_x_ipsecrequest_len;
1983 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1984 }
1985 return 0;
1986 }
1987
1988 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1989 {
1990 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1991
1992 if (xfrm_ctx) {
1993 int len = sizeof(struct sadb_x_sec_ctx);
1994 len += xfrm_ctx->ctx_len;
1995 return PFKEY_ALIGN8(len);
1996 }
1997 return 0;
1998 }
1999
2000 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2001 {
2002 const struct xfrm_tmpl *t;
2003 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2004 int socklen = 0;
2005 int i;
2006
2007 for (i=0; i<xp->xfrm_nr; i++) {
2008 t = xp->xfrm_vec + i;
2009 socklen += pfkey_sockaddr_len(t->encap_family);
2010 }
2011
2012 return sizeof(struct sadb_msg) +
2013 (sizeof(struct sadb_lifetime) * 3) +
2014 (sizeof(struct sadb_address) * 2) +
2015 (sockaddr_size * 2) +
2016 sizeof(struct sadb_x_policy) +
2017 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2018 (socklen * 2) +
2019 pfkey_xfrm_policy2sec_ctx_size(xp);
2020 }
2021
2022 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2023 {
2024 struct sk_buff *skb;
2025 int size;
2026
2027 size = pfkey_xfrm_policy2msg_size(xp);
2028
2029 skb = alloc_skb(size + 16, GFP_ATOMIC);
2030 if (skb == NULL)
2031 return ERR_PTR(-ENOBUFS);
2032
2033 return skb;
2034 }
2035
2036 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2037 {
2038 struct sadb_msg *hdr;
2039 struct sadb_address *addr;
2040 struct sadb_lifetime *lifetime;
2041 struct sadb_x_policy *pol;
2042 struct sadb_x_sec_ctx *sec_ctx;
2043 struct xfrm_sec_ctx *xfrm_ctx;
2044 int i;
2045 int size;
2046 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2047 int socklen = pfkey_sockaddr_len(xp->family);
2048
2049 size = pfkey_xfrm_policy2msg_size(xp);
2050
2051 /* call should fill header later */
2052 hdr = skb_put(skb, sizeof(struct sadb_msg));
2053 memset(hdr, 0, size); /* XXX do we need this ? */
2054
2055 /* src address */
2056 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2057 addr->sadb_address_len =
2058 (sizeof(struct sadb_address)+sockaddr_size)/
2059 sizeof(uint64_t);
2060 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2061 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2062 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2063 addr->sadb_address_reserved = 0;
2064 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2065 xp->selector.sport,
2066 (struct sockaddr *) (addr + 1),
2067 xp->family))
2068 BUG();
2069
2070 /* dst address */
2071 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2072 addr->sadb_address_len =
2073 (sizeof(struct sadb_address)+sockaddr_size)/
2074 sizeof(uint64_t);
2075 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2076 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2077 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2078 addr->sadb_address_reserved = 0;
2079
2080 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2081 (struct sockaddr *) (addr + 1),
2082 xp->family);
2083
2084 /* hard time */
2085 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2086 lifetime->sadb_lifetime_len =
2087 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2088 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2089 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2090 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2091 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2092 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2093 /* soft time */
2094 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2095 lifetime->sadb_lifetime_len =
2096 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2097 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2098 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2099 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2100 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2101 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2102 /* current time */
2103 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2104 lifetime->sadb_lifetime_len =
2105 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2106 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2107 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2108 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2109 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2110 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2111
2112 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2113 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2114 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2115 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2116 if (xp->action == XFRM_POLICY_ALLOW) {
2117 if (xp->xfrm_nr)
2118 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2119 else
2120 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2121 }
2122 pol->sadb_x_policy_dir = dir+1;
2123 pol->sadb_x_policy_reserved = 0;
2124 pol->sadb_x_policy_id = xp->index;
2125 pol->sadb_x_policy_priority = xp->priority;
2126
2127 for (i=0; i<xp->xfrm_nr; i++) {
2128 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2129 struct sadb_x_ipsecrequest *rq;
2130 int req_size;
2131 int mode;
2132
2133 req_size = sizeof(struct sadb_x_ipsecrequest);
2134 if (t->mode == XFRM_MODE_TUNNEL) {
2135 socklen = pfkey_sockaddr_len(t->encap_family);
2136 req_size += socklen * 2;
2137 } else {
2138 size -= 2*socklen;
2139 }
2140 rq = skb_put(skb, req_size);
2141 pol->sadb_x_policy_len += req_size/8;
2142 memset(rq, 0, sizeof(*rq));
2143 rq->sadb_x_ipsecrequest_len = req_size;
2144 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2145 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2146 return -EINVAL;
2147 rq->sadb_x_ipsecrequest_mode = mode;
2148 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2149 if (t->reqid)
2150 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2151 if (t->optional)
2152 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2153 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2154
2155 if (t->mode == XFRM_MODE_TUNNEL) {
2156 u8 *sa = (void *)(rq + 1);
2157 pfkey_sockaddr_fill(&t->saddr, 0,
2158 (struct sockaddr *)sa,
2159 t->encap_family);
2160 pfkey_sockaddr_fill(&t->id.daddr, 0,
2161 (struct sockaddr *) (sa + socklen),
2162 t->encap_family);
2163 }
2164 }
2165
2166 /* security context */
2167 if ((xfrm_ctx = xp->security)) {
2168 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2169
2170 sec_ctx = skb_put(skb, ctx_size);
2171 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2172 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2173 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2174 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2175 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2176 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2177 xfrm_ctx->ctx_len);
2178 }
2179
2180 hdr->sadb_msg_len = size / sizeof(uint64_t);
2181 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2182
2183 return 0;
2184 }
2185
2186 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2187 {
2188 struct sk_buff *out_skb;
2189 struct sadb_msg *out_hdr;
2190 int err;
2191
2192 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2193 if (IS_ERR(out_skb))
2194 return PTR_ERR(out_skb);
2195
2196 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2197 if (err < 0)
2198 return err;
2199
2200 out_hdr = (struct sadb_msg *) out_skb->data;
2201 out_hdr->sadb_msg_version = PF_KEY_V2;
2202
2203 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2204 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2205 else
2206 out_hdr->sadb_msg_type = event2poltype(c->event);
2207 out_hdr->sadb_msg_errno = 0;
2208 out_hdr->sadb_msg_seq = c->seq;
2209 out_hdr->sadb_msg_pid = c->portid;
2210 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2211 return 0;
2212
2213 }
2214
2215 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2216 {
2217 struct net *net = sock_net(sk);
2218 int err = 0;
2219 struct sadb_lifetime *lifetime;
2220 struct sadb_address *sa;
2221 struct sadb_x_policy *pol;
2222 struct xfrm_policy *xp;
2223 struct km_event c;
2224 struct sadb_x_sec_ctx *sec_ctx;
2225
2226 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2227 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2228 !ext_hdrs[SADB_X_EXT_POLICY-1])
2229 return -EINVAL;
2230
2231 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2232 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2233 return -EINVAL;
2234 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2235 return -EINVAL;
2236
2237 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2238 if (xp == NULL)
2239 return -ENOBUFS;
2240
2241 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2242 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2243 xp->priority = pol->sadb_x_policy_priority;
2244
2245 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2246 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2247 xp->selector.family = xp->family;
2248 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2249 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2250 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2251 if (xp->selector.sport)
2252 xp->selector.sport_mask = htons(0xffff);
2253
2254 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2255 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2256 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2257
2258 /* Amusing, we set this twice. KAME apps appear to set same value
2259 * in both addresses.
2260 */
2261 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2262
2263 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2264 if (xp->selector.dport)
2265 xp->selector.dport_mask = htons(0xffff);
2266
2267 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2268 if (sec_ctx != NULL) {
2269 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2270
2271 if (!uctx) {
2272 err = -ENOBUFS;
2273 goto out;
2274 }
2275
2276 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2277 kfree(uctx);
2278
2279 if (err)
2280 goto out;
2281 }
2282
2283 xp->lft.soft_byte_limit = XFRM_INF;
2284 xp->lft.hard_byte_limit = XFRM_INF;
2285 xp->lft.soft_packet_limit = XFRM_INF;
2286 xp->lft.hard_packet_limit = XFRM_INF;
2287 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2288 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2289 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2290 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2291 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2292 }
2293 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2294 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2295 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2296 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2297 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2298 }
2299 xp->xfrm_nr = 0;
2300 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2301 (err = parse_ipsecrequests(xp, pol)) < 0)
2302 goto out;
2303
2304 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2305 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2306
2307 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2308
2309 if (err)
2310 goto out;
2311
2312 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2313 c.event = XFRM_MSG_UPDPOLICY;
2314 else
2315 c.event = XFRM_MSG_NEWPOLICY;
2316
2317 c.seq = hdr->sadb_msg_seq;
2318 c.portid = hdr->sadb_msg_pid;
2319
2320 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2321 xfrm_pol_put(xp);
2322 return 0;
2323
2324 out:
2325 xp->walk.dead = 1;
2326 xfrm_policy_destroy(xp);
2327 return err;
2328 }
2329
2330 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2331 {
2332 struct net *net = sock_net(sk);
2333 int err;
2334 struct sadb_address *sa;
2335 struct sadb_x_policy *pol;
2336 struct xfrm_policy *xp;
2337 struct xfrm_selector sel;
2338 struct km_event c;
2339 struct sadb_x_sec_ctx *sec_ctx;
2340 struct xfrm_sec_ctx *pol_ctx = NULL;
2341
2342 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2343 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2344 !ext_hdrs[SADB_X_EXT_POLICY-1])
2345 return -EINVAL;
2346
2347 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2348 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2349 return -EINVAL;
2350
2351 memset(&sel, 0, sizeof(sel));
2352
2353 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2354 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2355 sel.prefixlen_s = sa->sadb_address_prefixlen;
2356 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2357 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2358 if (sel.sport)
2359 sel.sport_mask = htons(0xffff);
2360
2361 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2362 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2363 sel.prefixlen_d = sa->sadb_address_prefixlen;
2364 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2365 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2366 if (sel.dport)
2367 sel.dport_mask = htons(0xffff);
2368
2369 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2370 if (sec_ctx != NULL) {
2371 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2372
2373 if (!uctx)
2374 return -ENOMEM;
2375
2376 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2377 kfree(uctx);
2378 if (err)
2379 return err;
2380 }
2381
2382 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2383 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2384 1, &err);
2385 security_xfrm_policy_free(pol_ctx);
2386 if (xp == NULL)
2387 return -ENOENT;
2388
2389 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2390
2391 if (err)
2392 goto out;
2393
2394 c.seq = hdr->sadb_msg_seq;
2395 c.portid = hdr->sadb_msg_pid;
2396 c.data.byid = 0;
2397 c.event = XFRM_MSG_DELPOLICY;
2398 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2399
2400 out:
2401 xfrm_pol_put(xp);
2402 if (err == 0)
2403 xfrm_garbage_collect(net);
2404 return err;
2405 }
2406
2407 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2408 {
2409 int err;
2410 struct sk_buff *out_skb;
2411 struct sadb_msg *out_hdr;
2412 err = 0;
2413
2414 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2415 if (IS_ERR(out_skb)) {
2416 err = PTR_ERR(out_skb);
2417 goto out;
2418 }
2419 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2420 if (err < 0)
2421 goto out;
2422
2423 out_hdr = (struct sadb_msg *) out_skb->data;
2424 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2425 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2426 out_hdr->sadb_msg_satype = 0;
2427 out_hdr->sadb_msg_errno = 0;
2428 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2429 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2430 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2431 err = 0;
2432
2433 out:
2434 return err;
2435 }
2436
2437 static int pfkey_sockaddr_pair_size(sa_family_t family)
2438 {
2439 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2440 }
2441
2442 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2443 xfrm_address_t *saddr, xfrm_address_t *daddr,
2444 u16 *family)
2445 {
2446 int af, socklen;
2447
2448 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2449 return -EINVAL;
2450
2451 af = pfkey_sockaddr_extract(sa, saddr);
2452 if (!af)
2453 return -EINVAL;
2454
2455 socklen = pfkey_sockaddr_len(af);
2456 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2457 daddr) != af)
2458 return -EINVAL;
2459
2460 *family = af;
2461 return 0;
2462 }
2463
2464 #ifdef CONFIG_NET_KEY_MIGRATE
2465 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2466 struct xfrm_migrate *m)
2467 {
2468 int err;
2469 struct sadb_x_ipsecrequest *rq2;
2470 int mode;
2471
2472 if (len < sizeof(*rq1) ||
2473 len < rq1->sadb_x_ipsecrequest_len ||
2474 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2475 return -EINVAL;
2476
2477 /* old endoints */
2478 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2479 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2480 &m->old_saddr, &m->old_daddr,
2481 &m->old_family);
2482 if (err)
2483 return err;
2484
2485 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2486 len -= rq1->sadb_x_ipsecrequest_len;
2487
2488 if (len <= sizeof(*rq2) ||
2489 len < rq2->sadb_x_ipsecrequest_len ||
2490 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2491 return -EINVAL;
2492
2493 /* new endpoints */
2494 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2495 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2496 &m->new_saddr, &m->new_daddr,
2497 &m->new_family);
2498 if (err)
2499 return err;
2500
2501 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2502 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2503 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2504 return -EINVAL;
2505
2506 m->proto = rq1->sadb_x_ipsecrequest_proto;
2507 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2508 return -EINVAL;
2509 m->mode = mode;
2510 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2511
2512 return ((int)(rq1->sadb_x_ipsecrequest_len +
2513 rq2->sadb_x_ipsecrequest_len));
2514 }
2515
2516 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2517 const struct sadb_msg *hdr, void * const *ext_hdrs)
2518 {
2519 int i, len, ret, err = -EINVAL;
2520 u8 dir;
2521 struct sadb_address *sa;
2522 struct sadb_x_kmaddress *kma;
2523 struct sadb_x_policy *pol;
2524 struct sadb_x_ipsecrequest *rq;
2525 struct xfrm_selector sel;
2526 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2527 struct xfrm_kmaddress k;
2528 struct net *net = sock_net(sk);
2529
2530 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2531 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2532 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2533 err = -EINVAL;
2534 goto out;
2535 }
2536
2537 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2538 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2539
2540 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2541 err = -EINVAL;
2542 goto out;
2543 }
2544
2545 if (kma) {
2546 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2547 k.reserved = kma->sadb_x_kmaddress_reserved;
2548 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2549 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2550 &k.local, &k.remote, &k.family);
2551 if (ret < 0) {
2552 err = ret;
2553 goto out;
2554 }
2555 }
2556
2557 dir = pol->sadb_x_policy_dir - 1;
2558 memset(&sel, 0, sizeof(sel));
2559
2560 /* set source address info of selector */
2561 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2562 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2563 sel.prefixlen_s = sa->sadb_address_prefixlen;
2564 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2565 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2566 if (sel.sport)
2567 sel.sport_mask = htons(0xffff);
2568
2569 /* set destination address info of selector */
2570 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2571 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2572 sel.prefixlen_d = sa->sadb_address_prefixlen;
2573 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2574 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2575 if (sel.dport)
2576 sel.dport_mask = htons(0xffff);
2577
2578 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2579
2580 /* extract ipsecrequests */
2581 i = 0;
2582 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2583
2584 while (len > 0 && i < XFRM_MAX_DEPTH) {
2585 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2586 if (ret < 0) {
2587 err = ret;
2588 goto out;
2589 } else {
2590 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2591 len -= ret;
2592 i++;
2593 }
2594 }
2595
2596 if (!i || len > 0) {
2597 err = -EINVAL;
2598 goto out;
2599 }
2600
2601 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2602 kma ? &k : NULL, net, NULL);
2603
2604 out:
2605 return err;
2606 }
2607 #else
2608 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2609 const struct sadb_msg *hdr, void * const *ext_hdrs)
2610 {
2611 return -ENOPROTOOPT;
2612 }
2613 #endif
2614
2615
2616 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2617 {
2618 struct net *net = sock_net(sk);
2619 unsigned int dir;
2620 int err = 0, delete;
2621 struct sadb_x_policy *pol;
2622 struct xfrm_policy *xp;
2623 struct km_event c;
2624
2625 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2626 return -EINVAL;
2627
2628 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2629 if (dir >= XFRM_POLICY_MAX)
2630 return -EINVAL;
2631
2632 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2633 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2634 dir, pol->sadb_x_policy_id, delete, &err);
2635 if (xp == NULL)
2636 return -ENOENT;
2637
2638 if (delete) {
2639 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2640
2641 if (err)
2642 goto out;
2643 c.seq = hdr->sadb_msg_seq;
2644 c.portid = hdr->sadb_msg_pid;
2645 c.data.byid = 1;
2646 c.event = XFRM_MSG_DELPOLICY;
2647 km_policy_notify(xp, dir, &c);
2648 } else {
2649 err = key_pol_get_resp(sk, xp, hdr, dir);
2650 }
2651
2652 out:
2653 xfrm_pol_put(xp);
2654 if (delete && err == 0)
2655 xfrm_garbage_collect(net);
2656 return err;
2657 }
2658
2659 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2660 {
2661 struct pfkey_sock *pfk = ptr;
2662 struct sk_buff *out_skb;
2663 struct sadb_msg *out_hdr;
2664 int err;
2665
2666 if (!pfkey_can_dump(&pfk->sk))
2667 return -ENOBUFS;
2668
2669 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2670 if (IS_ERR(out_skb))
2671 return PTR_ERR(out_skb);
2672
2673 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2674 if (err < 0)
2675 return err;
2676
2677 out_hdr = (struct sadb_msg *) out_skb->data;
2678 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2679 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2680 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2681 out_hdr->sadb_msg_errno = 0;
2682 out_hdr->sadb_msg_seq = count + 1;
2683 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2684
2685 if (pfk->dump.skb)
2686 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2687 &pfk->sk, sock_net(&pfk->sk));
2688 pfk->dump.skb = out_skb;
2689
2690 return 0;
2691 }
2692
2693 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2694 {
2695 struct net *net = sock_net(&pfk->sk);
2696 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2697 }
2698
2699 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2700 {
2701 struct net *net = sock_net((struct sock *)pfk);
2702
2703 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2704 }
2705
2706 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2707 {
2708 struct pfkey_sock *pfk = pfkey_sk(sk);
2709
2710 mutex_lock(&pfk->dump_lock);
2711 if (pfk->dump.dump != NULL) {
2712 mutex_unlock(&pfk->dump_lock);
2713 return -EBUSY;
2714 }
2715
2716 pfk->dump.msg_version = hdr->sadb_msg_version;
2717 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2718 pfk->dump.dump = pfkey_dump_sp;
2719 pfk->dump.done = pfkey_dump_sp_done;
2720 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2721 mutex_unlock(&pfk->dump_lock);
2722
2723 return pfkey_do_dump(pfk);
2724 }
2725
2726 static int key_notify_policy_flush(const struct km_event *c)
2727 {
2728 struct sk_buff *skb_out;
2729 struct sadb_msg *hdr;
2730
2731 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2732 if (!skb_out)
2733 return -ENOBUFS;
2734 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2735 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2736 hdr->sadb_msg_seq = c->seq;
2737 hdr->sadb_msg_pid = c->portid;
2738 hdr->sadb_msg_version = PF_KEY_V2;
2739 hdr->sadb_msg_errno = (uint8_t) 0;
2740 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2741 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2742 hdr->sadb_msg_reserved = 0;
2743 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2744 return 0;
2745
2746 }
2747
2748 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2749 {
2750 struct net *net = sock_net(sk);
2751 struct km_event c;
2752 int err, err2;
2753
2754 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2755 if (!err)
2756 xfrm_garbage_collect(net);
2757 err2 = unicast_flush_resp(sk, hdr);
2758 if (err || err2) {
2759 if (err == -ESRCH) /* empty table - old silent behavior */
2760 return 0;
2761 return err;
2762 }
2763
2764 c.data.type = XFRM_POLICY_TYPE_MAIN;
2765 c.event = XFRM_MSG_FLUSHPOLICY;
2766 c.portid = hdr->sadb_msg_pid;
2767 c.seq = hdr->sadb_msg_seq;
2768 c.net = net;
2769 km_policy_notify(NULL, 0, &c);
2770
2771 return 0;
2772 }
2773
2774 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2775 const struct sadb_msg *hdr, void * const *ext_hdrs);
2776 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2777 [SADB_RESERVED] = pfkey_reserved,
2778 [SADB_GETSPI] = pfkey_getspi,
2779 [SADB_UPDATE] = pfkey_add,
2780 [SADB_ADD] = pfkey_add,
2781 [SADB_DELETE] = pfkey_delete,
2782 [SADB_GET] = pfkey_get,
2783 [SADB_ACQUIRE] = pfkey_acquire,
2784 [SADB_REGISTER] = pfkey_register,
2785 [SADB_EXPIRE] = NULL,
2786 [SADB_FLUSH] = pfkey_flush,
2787 [SADB_DUMP] = pfkey_dump,
2788 [SADB_X_PROMISC] = pfkey_promisc,
2789 [SADB_X_PCHANGE] = NULL,
2790 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2791 [SADB_X_SPDADD] = pfkey_spdadd,
2792 [SADB_X_SPDDELETE] = pfkey_spddelete,
2793 [SADB_X_SPDGET] = pfkey_spdget,
2794 [SADB_X_SPDACQUIRE] = NULL,
2795 [SADB_X_SPDDUMP] = pfkey_spddump,
2796 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2797 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2798 [SADB_X_SPDDELETE2] = pfkey_spdget,
2799 [SADB_X_MIGRATE] = pfkey_migrate,
2800 };
2801
2802 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2803 {
2804 void *ext_hdrs[SADB_EXT_MAX];
2805 int err;
2806
2807 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2808 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2809
2810 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2811 err = parse_exthdrs(skb, hdr, ext_hdrs);
2812 if (!err) {
2813 err = -EOPNOTSUPP;
2814 if (pfkey_funcs[hdr->sadb_msg_type])
2815 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2816 }
2817 return err;
2818 }
2819
2820 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2821 {
2822 struct sadb_msg *hdr = NULL;
2823
2824 if (skb->len < sizeof(*hdr)) {
2825 *errp = -EMSGSIZE;
2826 } else {
2827 hdr = (struct sadb_msg *) skb->data;
2828 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2829 hdr->sadb_msg_reserved != 0 ||
2830 (hdr->sadb_msg_type <= SADB_RESERVED ||
2831 hdr->sadb_msg_type > SADB_MAX)) {
2832 hdr = NULL;
2833 *errp = -EINVAL;
2834 } else if (hdr->sadb_msg_len != (skb->len /
2835 sizeof(uint64_t)) ||
2836 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2837 sizeof(uint64_t))) {
2838 hdr = NULL;
2839 *errp = -EMSGSIZE;
2840 } else {
2841 *errp = 0;
2842 }
2843 }
2844 return hdr;
2845 }
2846
2847 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2848 const struct xfrm_algo_desc *d)
2849 {
2850 unsigned int id = d->desc.sadb_alg_id;
2851
2852 if (id >= sizeof(t->aalgos) * 8)
2853 return 0;
2854
2855 return (t->aalgos >> id) & 1;
2856 }
2857
2858 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2859 const struct xfrm_algo_desc *d)
2860 {
2861 unsigned int id = d->desc.sadb_alg_id;
2862
2863 if (id >= sizeof(t->ealgos) * 8)
2864 return 0;
2865
2866 return (t->ealgos >> id) & 1;
2867 }
2868
2869 static int count_ah_combs(const struct xfrm_tmpl *t)
2870 {
2871 int i, sz = 0;
2872
2873 for (i = 0; ; i++) {
2874 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2875 if (!aalg)
2876 break;
2877 if (!aalg->pfkey_supported)
2878 continue;
2879 if (aalg_tmpl_set(t, aalg) && aalg->available)
2880 sz += sizeof(struct sadb_comb);
2881 }
2882 return sz + sizeof(struct sadb_prop);
2883 }
2884
2885 static int count_esp_combs(const struct xfrm_tmpl *t)
2886 {
2887 int i, k, sz = 0;
2888
2889 for (i = 0; ; i++) {
2890 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2891 if (!ealg)
2892 break;
2893
2894 if (!ealg->pfkey_supported)
2895 continue;
2896
2897 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2898 continue;
2899
2900 for (k = 1; ; k++) {
2901 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2902 if (!aalg)
2903 break;
2904
2905 if (!aalg->pfkey_supported)
2906 continue;
2907
2908 if (aalg_tmpl_set(t, aalg) && aalg->available)
2909 sz += sizeof(struct sadb_comb);
2910 }
2911 }
2912 return sz + sizeof(struct sadb_prop);
2913 }
2914
2915 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2916 {
2917 struct sadb_prop *p;
2918 int i;
2919
2920 p = skb_put(skb, sizeof(struct sadb_prop));
2921 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2922 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2923 p->sadb_prop_replay = 32;
2924 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2925
2926 for (i = 0; ; i++) {
2927 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2928 if (!aalg)
2929 break;
2930
2931 if (!aalg->pfkey_supported)
2932 continue;
2933
2934 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2935 struct sadb_comb *c;
2936 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2937 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2938 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2939 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2940 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2941 c->sadb_comb_hard_addtime = 24*60*60;
2942 c->sadb_comb_soft_addtime = 20*60*60;
2943 c->sadb_comb_hard_usetime = 8*60*60;
2944 c->sadb_comb_soft_usetime = 7*60*60;
2945 }
2946 }
2947 }
2948
2949 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2950 {
2951 struct sadb_prop *p;
2952 int i, k;
2953
2954 p = skb_put(skb, sizeof(struct sadb_prop));
2955 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2956 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2957 p->sadb_prop_replay = 32;
2958 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2959
2960 for (i=0; ; i++) {
2961 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2962 if (!ealg)
2963 break;
2964
2965 if (!ealg->pfkey_supported)
2966 continue;
2967
2968 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2969 continue;
2970
2971 for (k = 1; ; k++) {
2972 struct sadb_comb *c;
2973 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2974 if (!aalg)
2975 break;
2976 if (!aalg->pfkey_supported)
2977 continue;
2978 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2979 continue;
2980 c = skb_put(skb, sizeof(struct sadb_comb));
2981 memset(c, 0, sizeof(*c));
2982 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2983 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2984 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2985 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2986 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2987 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2988 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2989 c->sadb_comb_hard_addtime = 24*60*60;
2990 c->sadb_comb_soft_addtime = 20*60*60;
2991 c->sadb_comb_hard_usetime = 8*60*60;
2992 c->sadb_comb_soft_usetime = 7*60*60;
2993 }
2994 }
2995 }
2996
2997 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2998 {
2999 return 0;
3000 }
3001
3002 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3003 {
3004 struct sk_buff *out_skb;
3005 struct sadb_msg *out_hdr;
3006 int hard;
3007 int hsc;
3008
3009 hard = c->data.hard;
3010 if (hard)
3011 hsc = 2;
3012 else
3013 hsc = 1;
3014
3015 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3016 if (IS_ERR(out_skb))
3017 return PTR_ERR(out_skb);
3018
3019 out_hdr = (struct sadb_msg *) out_skb->data;
3020 out_hdr->sadb_msg_version = PF_KEY_V2;
3021 out_hdr->sadb_msg_type = SADB_EXPIRE;
3022 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3023 out_hdr->sadb_msg_errno = 0;
3024 out_hdr->sadb_msg_reserved = 0;
3025 out_hdr->sadb_msg_seq = 0;
3026 out_hdr->sadb_msg_pid = 0;
3027
3028 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3029 xs_net(x));
3030 return 0;
3031 }
3032
3033 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3034 {
3035 struct net *net = x ? xs_net(x) : c->net;
3036 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3037
3038 if (atomic_read(&net_pfkey->socks_nr) == 0)
3039 return 0;
3040
3041 switch (c->event) {
3042 case XFRM_MSG_EXPIRE:
3043 return key_notify_sa_expire(x, c);
3044 case XFRM_MSG_DELSA:
3045 case XFRM_MSG_NEWSA:
3046 case XFRM_MSG_UPDSA:
3047 return key_notify_sa(x, c);
3048 case XFRM_MSG_FLUSHSA:
3049 return key_notify_sa_flush(c);
3050 case XFRM_MSG_NEWAE: /* not yet supported */
3051 break;
3052 default:
3053 pr_err("pfkey: Unknown SA event %d\n", c->event);
3054 break;
3055 }
3056
3057 return 0;
3058 }
3059
3060 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3061 {
3062 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3063 return 0;
3064
3065 switch (c->event) {
3066 case XFRM_MSG_POLEXPIRE:
3067 return key_notify_policy_expire(xp, c);
3068 case XFRM_MSG_DELPOLICY:
3069 case XFRM_MSG_NEWPOLICY:
3070 case XFRM_MSG_UPDPOLICY:
3071 return key_notify_policy(xp, dir, c);
3072 case XFRM_MSG_FLUSHPOLICY:
3073 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3074 break;
3075 return key_notify_policy_flush(c);
3076 default:
3077 pr_err("pfkey: Unknown policy event %d\n", c->event);
3078 break;
3079 }
3080
3081 return 0;
3082 }
3083
3084 static u32 get_acqseq(void)
3085 {
3086 u32 res;
3087 static atomic_t acqseq;
3088
3089 do {
3090 res = atomic_inc_return(&acqseq);
3091 } while (!res);
3092 return res;
3093 }
3094
3095 static bool pfkey_is_alive(const struct km_event *c)
3096 {
3097 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3098 struct sock *sk;
3099 bool is_alive = false;
3100
3101 rcu_read_lock();
3102 sk_for_each_rcu(sk, &net_pfkey->table) {
3103 if (pfkey_sk(sk)->registered) {
3104 is_alive = true;
3105 break;
3106 }
3107 }
3108 rcu_read_unlock();
3109
3110 return is_alive;
3111 }
3112
3113 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3114 {
3115 struct sk_buff *skb;
3116 struct sadb_msg *hdr;
3117 struct sadb_address *addr;
3118 struct sadb_x_policy *pol;
3119 int sockaddr_size;
3120 int size;
3121 struct sadb_x_sec_ctx *sec_ctx;
3122 struct xfrm_sec_ctx *xfrm_ctx;
3123 int ctx_size = 0;
3124
3125 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3126 if (!sockaddr_size)
3127 return -EINVAL;
3128
3129 size = sizeof(struct sadb_msg) +
3130 (sizeof(struct sadb_address) * 2) +
3131 (sockaddr_size * 2) +
3132 sizeof(struct sadb_x_policy);
3133
3134 if (x->id.proto == IPPROTO_AH)
3135 size += count_ah_combs(t);
3136 else if (x->id.proto == IPPROTO_ESP)
3137 size += count_esp_combs(t);
3138
3139 if ((xfrm_ctx = x->security)) {
3140 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3141 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3142 }
3143
3144 skb = alloc_skb(size + 16, GFP_ATOMIC);
3145 if (skb == NULL)
3146 return -ENOMEM;
3147
3148 hdr = skb_put(skb, sizeof(struct sadb_msg));
3149 hdr->sadb_msg_version = PF_KEY_V2;
3150 hdr->sadb_msg_type = SADB_ACQUIRE;
3151 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3152 hdr->sadb_msg_len = size / sizeof(uint64_t);
3153 hdr->sadb_msg_errno = 0;
3154 hdr->sadb_msg_reserved = 0;
3155 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3156 hdr->sadb_msg_pid = 0;
3157
3158 /* src address */
3159 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3160 addr->sadb_address_len =
3161 (sizeof(struct sadb_address)+sockaddr_size)/
3162 sizeof(uint64_t);
3163 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3164 addr->sadb_address_proto = 0;
3165 addr->sadb_address_reserved = 0;
3166 addr->sadb_address_prefixlen =
3167 pfkey_sockaddr_fill(&x->props.saddr, 0,
3168 (struct sockaddr *) (addr + 1),
3169 x->props.family);
3170 if (!addr->sadb_address_prefixlen)
3171 BUG();
3172
3173 /* dst address */
3174 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3175 addr->sadb_address_len =
3176 (sizeof(struct sadb_address)+sockaddr_size)/
3177 sizeof(uint64_t);
3178 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3179 addr->sadb_address_proto = 0;
3180 addr->sadb_address_reserved = 0;
3181 addr->sadb_address_prefixlen =
3182 pfkey_sockaddr_fill(&x->id.daddr, 0,
3183 (struct sockaddr *) (addr + 1),
3184 x->props.family);
3185 if (!addr->sadb_address_prefixlen)
3186 BUG();
3187
3188 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3189 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3190 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3191 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3192 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3193 pol->sadb_x_policy_reserved = 0;
3194 pol->sadb_x_policy_id = xp->index;
3195 pol->sadb_x_policy_priority = xp->priority;
3196
3197 /* Set sadb_comb's. */
3198 if (x->id.proto == IPPROTO_AH)
3199 dump_ah_combs(skb, t);
3200 else if (x->id.proto == IPPROTO_ESP)
3201 dump_esp_combs(skb, t);
3202
3203 /* security context */
3204 if (xfrm_ctx) {
3205 sec_ctx = skb_put(skb,
3206 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3207 sec_ctx->sadb_x_sec_len =
3208 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3209 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3210 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3211 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3212 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3213 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3214 xfrm_ctx->ctx_len);
3215 }
3216
3217 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3218 xs_net(x));
3219 }
3220
3221 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3222 u8 *data, int len, int *dir)
3223 {
3224 struct net *net = sock_net(sk);
3225 struct xfrm_policy *xp;
3226 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3227 struct sadb_x_sec_ctx *sec_ctx;
3228
3229 switch (sk->sk_family) {
3230 case AF_INET:
3231 if (opt != IP_IPSEC_POLICY) {
3232 *dir = -EOPNOTSUPP;
3233 return NULL;
3234 }
3235 break;
3236 #if IS_ENABLED(CONFIG_IPV6)
3237 case AF_INET6:
3238 if (opt != IPV6_IPSEC_POLICY) {
3239 *dir = -EOPNOTSUPP;
3240 return NULL;
3241 }
3242 break;
3243 #endif
3244 default:
3245 *dir = -EINVAL;
3246 return NULL;
3247 }
3248
3249 *dir = -EINVAL;
3250
3251 if (len < sizeof(struct sadb_x_policy) ||
3252 pol->sadb_x_policy_len*8 > len ||
3253 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3254 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3255 return NULL;
3256
3257 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3258 if (xp == NULL) {
3259 *dir = -ENOBUFS;
3260 return NULL;
3261 }
3262
3263 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3264 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3265
3266 xp->lft.soft_byte_limit = XFRM_INF;
3267 xp->lft.hard_byte_limit = XFRM_INF;
3268 xp->lft.soft_packet_limit = XFRM_INF;
3269 xp->lft.hard_packet_limit = XFRM_INF;
3270 xp->family = sk->sk_family;
3271
3272 xp->xfrm_nr = 0;
3273 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3274 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3275 goto out;
3276
3277 /* security context too */
3278 if (len >= (pol->sadb_x_policy_len*8 +
3279 sizeof(struct sadb_x_sec_ctx))) {
3280 char *p = (char *)pol;
3281 struct xfrm_user_sec_ctx *uctx;
3282
3283 p += pol->sadb_x_policy_len*8;
3284 sec_ctx = (struct sadb_x_sec_ctx *)p;
3285 if (len < pol->sadb_x_policy_len*8 +
3286 sec_ctx->sadb_x_sec_len*8) {
3287 *dir = -EINVAL;
3288 goto out;
3289 }
3290 if ((*dir = verify_sec_ctx_len(p)))
3291 goto out;
3292 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3293 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3294 kfree(uctx);
3295
3296 if (*dir)
3297 goto out;
3298 }
3299
3300 *dir = pol->sadb_x_policy_dir-1;
3301 return xp;
3302
3303 out:
3304 xp->walk.dead = 1;
3305 xfrm_policy_destroy(xp);
3306 return NULL;
3307 }
3308
3309 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3310 {
3311 struct sk_buff *skb;
3312 struct sadb_msg *hdr;
3313 struct sadb_sa *sa;
3314 struct sadb_address *addr;
3315 struct sadb_x_nat_t_port *n_port;
3316 int sockaddr_size;
3317 int size;
3318 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3319 struct xfrm_encap_tmpl *natt = NULL;
3320
3321 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3322 if (!sockaddr_size)
3323 return -EINVAL;
3324
3325 if (!satype)
3326 return -EINVAL;
3327
3328 if (!x->encap)
3329 return -EINVAL;
3330
3331 natt = x->encap;
3332
3333 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3334 *
3335 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3336 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3337 */
3338
3339 size = sizeof(struct sadb_msg) +
3340 sizeof(struct sadb_sa) +
3341 (sizeof(struct sadb_address) * 2) +
3342 (sockaddr_size * 2) +
3343 (sizeof(struct sadb_x_nat_t_port) * 2);
3344
3345 skb = alloc_skb(size + 16, GFP_ATOMIC);
3346 if (skb == NULL)
3347 return -ENOMEM;
3348
3349 hdr = skb_put(skb, sizeof(struct sadb_msg));
3350 hdr->sadb_msg_version = PF_KEY_V2;
3351 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3352 hdr->sadb_msg_satype = satype;
3353 hdr->sadb_msg_len = size / sizeof(uint64_t);
3354 hdr->sadb_msg_errno = 0;
3355 hdr->sadb_msg_reserved = 0;
3356 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3357 hdr->sadb_msg_pid = 0;
3358
3359 /* SA */
3360 sa = skb_put(skb, sizeof(struct sadb_sa));
3361 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3362 sa->sadb_sa_exttype = SADB_EXT_SA;
3363 sa->sadb_sa_spi = x->id.spi;
3364 sa->sadb_sa_replay = 0;
3365 sa->sadb_sa_state = 0;
3366 sa->sadb_sa_auth = 0;
3367 sa->sadb_sa_encrypt = 0;
3368 sa->sadb_sa_flags = 0;
3369
3370 /* ADDRESS_SRC (old addr) */
3371 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3372 addr->sadb_address_len =
3373 (sizeof(struct sadb_address)+sockaddr_size)/
3374 sizeof(uint64_t);
3375 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3376 addr->sadb_address_proto = 0;
3377 addr->sadb_address_reserved = 0;
3378 addr->sadb_address_prefixlen =
3379 pfkey_sockaddr_fill(&x->props.saddr, 0,
3380 (struct sockaddr *) (addr + 1),
3381 x->props.family);
3382 if (!addr->sadb_address_prefixlen)
3383 BUG();
3384
3385 /* NAT_T_SPORT (old port) */
3386 n_port = skb_put(skb, sizeof(*n_port));
3387 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3388 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3389 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3390 n_port->sadb_x_nat_t_port_reserved = 0;
3391
3392 /* ADDRESS_DST (new addr) */
3393 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3394 addr->sadb_address_len =
3395 (sizeof(struct sadb_address)+sockaddr_size)/
3396 sizeof(uint64_t);
3397 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3398 addr->sadb_address_proto = 0;
3399 addr->sadb_address_reserved = 0;
3400 addr->sadb_address_prefixlen =
3401 pfkey_sockaddr_fill(ipaddr, 0,
3402 (struct sockaddr *) (addr + 1),
3403 x->props.family);
3404 if (!addr->sadb_address_prefixlen)
3405 BUG();
3406
3407 /* NAT_T_DPORT (new port) */
3408 n_port = skb_put(skb, sizeof(*n_port));
3409 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3410 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3411 n_port->sadb_x_nat_t_port_port = sport;
3412 n_port->sadb_x_nat_t_port_reserved = 0;
3413
3414 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3415 xs_net(x));
3416 }
3417
3418 #ifdef CONFIG_NET_KEY_MIGRATE
3419 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3420 const struct xfrm_selector *sel)
3421 {
3422 struct sadb_address *addr;
3423 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3424 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3425 addr->sadb_address_exttype = type;
3426 addr->sadb_address_proto = sel->proto;
3427 addr->sadb_address_reserved = 0;
3428
3429 switch (type) {
3430 case SADB_EXT_ADDRESS_SRC:
3431 addr->sadb_address_prefixlen = sel->prefixlen_s;
3432 pfkey_sockaddr_fill(&sel->saddr, 0,
3433 (struct sockaddr *)(addr + 1),
3434 sel->family);
3435 break;
3436 case SADB_EXT_ADDRESS_DST:
3437 addr->sadb_address_prefixlen = sel->prefixlen_d;
3438 pfkey_sockaddr_fill(&sel->daddr, 0,
3439 (struct sockaddr *)(addr + 1),
3440 sel->family);
3441 break;
3442 default:
3443 return -EINVAL;
3444 }
3445
3446 return 0;
3447 }
3448
3449
3450 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3451 {
3452 struct sadb_x_kmaddress *kma;
3453 u8 *sa;
3454 int family = k->family;
3455 int socklen = pfkey_sockaddr_len(family);
3456 int size_req;
3457
3458 size_req = (sizeof(struct sadb_x_kmaddress) +
3459 pfkey_sockaddr_pair_size(family));
3460
3461 kma = skb_put_zero(skb, size_req);
3462 kma->sadb_x_kmaddress_len = size_req / 8;
3463 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3464 kma->sadb_x_kmaddress_reserved = k->reserved;
3465
3466 sa = (u8 *)(kma + 1);
3467 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3468 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3469 return -EINVAL;
3470
3471 return 0;
3472 }
3473
3474 static int set_ipsecrequest(struct sk_buff *skb,
3475 uint8_t proto, uint8_t mode, int level,
3476 uint32_t reqid, uint8_t family,
3477 const xfrm_address_t *src, const xfrm_address_t *dst)
3478 {
3479 struct sadb_x_ipsecrequest *rq;
3480 u8 *sa;
3481 int socklen = pfkey_sockaddr_len(family);
3482 int size_req;
3483
3484 size_req = sizeof(struct sadb_x_ipsecrequest) +
3485 pfkey_sockaddr_pair_size(family);
3486
3487 rq = skb_put_zero(skb, size_req);
3488 rq->sadb_x_ipsecrequest_len = size_req;
3489 rq->sadb_x_ipsecrequest_proto = proto;
3490 rq->sadb_x_ipsecrequest_mode = mode;
3491 rq->sadb_x_ipsecrequest_level = level;
3492 rq->sadb_x_ipsecrequest_reqid = reqid;
3493
3494 sa = (u8 *) (rq + 1);
3495 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3496 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3497 return -EINVAL;
3498
3499 return 0;
3500 }
3501 #endif
3502
3503 #ifdef CONFIG_NET_KEY_MIGRATE
3504 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3505 const struct xfrm_migrate *m, int num_bundles,
3506 const struct xfrm_kmaddress *k,
3507 const struct xfrm_encap_tmpl *encap)
3508 {
3509 int i;
3510 int sasize_sel;
3511 int size = 0;
3512 int size_pol = 0;
3513 struct sk_buff *skb;
3514 struct sadb_msg *hdr;
3515 struct sadb_x_policy *pol;
3516 const struct xfrm_migrate *mp;
3517
3518 if (type != XFRM_POLICY_TYPE_MAIN)
3519 return 0;
3520
3521 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3522 return -EINVAL;
3523
3524 if (k != NULL) {
3525 /* addresses for KM */
3526 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3527 pfkey_sockaddr_pair_size(k->family));
3528 }
3529
3530 /* selector */
3531 sasize_sel = pfkey_sockaddr_size(sel->family);
3532 if (!sasize_sel)
3533 return -EINVAL;
3534 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3535
3536 /* policy info */
3537 size_pol += sizeof(struct sadb_x_policy);
3538
3539 /* ipsecrequests */
3540 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3541 /* old locator pair */
3542 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3543 pfkey_sockaddr_pair_size(mp->old_family);
3544 /* new locator pair */
3545 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3546 pfkey_sockaddr_pair_size(mp->new_family);
3547 }
3548
3549 size += sizeof(struct sadb_msg) + size_pol;
3550
3551 /* alloc buffer */
3552 skb = alloc_skb(size, GFP_ATOMIC);
3553 if (skb == NULL)
3554 return -ENOMEM;
3555
3556 hdr = skb_put(skb, sizeof(struct sadb_msg));
3557 hdr->sadb_msg_version = PF_KEY_V2;
3558 hdr->sadb_msg_type = SADB_X_MIGRATE;
3559 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3560 hdr->sadb_msg_len = size / 8;
3561 hdr->sadb_msg_errno = 0;
3562 hdr->sadb_msg_reserved = 0;
3563 hdr->sadb_msg_seq = 0;
3564 hdr->sadb_msg_pid = 0;
3565
3566 /* Addresses to be used by KM for negotiation, if ext is available */
3567 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3568 goto err;
3569
3570 /* selector src */
3571 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3572
3573 /* selector dst */
3574 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3575
3576 /* policy information */
3577 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3578 pol->sadb_x_policy_len = size_pol / 8;
3579 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3580 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3581 pol->sadb_x_policy_dir = dir + 1;
3582 pol->sadb_x_policy_reserved = 0;
3583 pol->sadb_x_policy_id = 0;
3584 pol->sadb_x_policy_priority = 0;
3585
3586 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3587 /* old ipsecrequest */
3588 int mode = pfkey_mode_from_xfrm(mp->mode);
3589 if (mode < 0)
3590 goto err;
3591 if (set_ipsecrequest(skb, mp->proto, mode,
3592 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3593 mp->reqid, mp->old_family,
3594 &mp->old_saddr, &mp->old_daddr) < 0)
3595 goto err;
3596
3597 /* new ipsecrequest */
3598 if (set_ipsecrequest(skb, mp->proto, mode,
3599 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3600 mp->reqid, mp->new_family,
3601 &mp->new_saddr, &mp->new_daddr) < 0)
3602 goto err;
3603 }
3604
3605 /* broadcast migrate message to sockets */
3606 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3607
3608 return 0;
3609
3610 err:
3611 kfree_skb(skb);
3612 return -EINVAL;
3613 }
3614 #else
3615 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3616 const struct xfrm_migrate *m, int num_bundles,
3617 const struct xfrm_kmaddress *k,
3618 const struct xfrm_encap_tmpl *encap)
3619 {
3620 return -ENOPROTOOPT;
3621 }
3622 #endif
3623
3624 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3625 {
3626 struct sock *sk = sock->sk;
3627 struct sk_buff *skb = NULL;
3628 struct sadb_msg *hdr = NULL;
3629 int err;
3630 struct net *net = sock_net(sk);
3631
3632 err = -EOPNOTSUPP;
3633 if (msg->msg_flags & MSG_OOB)
3634 goto out;
3635
3636 err = -EMSGSIZE;
3637 if ((unsigned int)len > sk->sk_sndbuf - 32)
3638 goto out;
3639
3640 err = -ENOBUFS;
3641 skb = alloc_skb(len, GFP_KERNEL);
3642 if (skb == NULL)
3643 goto out;
3644
3645 err = -EFAULT;
3646 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3647 goto out;
3648
3649 hdr = pfkey_get_base_msg(skb, &err);
3650 if (!hdr)
3651 goto out;
3652
3653 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3654 err = pfkey_process(sk, skb, hdr);
3655 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3656
3657 out:
3658 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3659 err = 0;
3660 kfree_skb(skb);
3661
3662 return err ? : len;
3663 }
3664
3665 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3666 int flags)
3667 {
3668 struct sock *sk = sock->sk;
3669 struct pfkey_sock *pfk = pfkey_sk(sk);
3670 struct sk_buff *skb;
3671 int copied, err;
3672
3673 err = -EINVAL;
3674 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3675 goto out;
3676
3677 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3678 if (skb == NULL)
3679 goto out;
3680
3681 copied = skb->len;
3682 if (copied > len) {
3683 msg->msg_flags |= MSG_TRUNC;
3684 copied = len;
3685 }
3686
3687 skb_reset_transport_header(skb);
3688 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3689 if (err)
3690 goto out_free;
3691
3692 sock_recv_ts_and_drops(msg, sk, skb);
3693
3694 err = (flags & MSG_TRUNC) ? skb->len : copied;
3695
3696 if (pfk->dump.dump != NULL &&
3697 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3698 pfkey_do_dump(pfk);
3699
3700 out_free:
3701 skb_free_datagram(sk, skb);
3702 out:
3703 return err;
3704 }
3705
3706 static const struct proto_ops pfkey_ops = {
3707 .family = PF_KEY,
3708 .owner = THIS_MODULE,
3709 /* Operations that make no sense on pfkey sockets. */
3710 .bind = sock_no_bind,
3711 .connect = sock_no_connect,
3712 .socketpair = sock_no_socketpair,
3713 .accept = sock_no_accept,
3714 .getname = sock_no_getname,
3715 .ioctl = sock_no_ioctl,
3716 .listen = sock_no_listen,
3717 .shutdown = sock_no_shutdown,
3718 .setsockopt = sock_no_setsockopt,
3719 .getsockopt = sock_no_getsockopt,
3720 .mmap = sock_no_mmap,
3721 .sendpage = sock_no_sendpage,
3722
3723 /* Now the operations that really occur. */
3724 .release = pfkey_release,
3725 .poll = datagram_poll,
3726 .sendmsg = pfkey_sendmsg,
3727 .recvmsg = pfkey_recvmsg,
3728 };
3729
3730 static const struct net_proto_family pfkey_family_ops = {
3731 .family = PF_KEY,
3732 .create = pfkey_create,
3733 .owner = THIS_MODULE,
3734 };
3735
3736 #ifdef CONFIG_PROC_FS
3737 static int pfkey_seq_show(struct seq_file *f, void *v)
3738 {
3739 struct sock *s = sk_entry(v);
3740
3741 if (v == SEQ_START_TOKEN)
3742 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3743 else
3744 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3745 s,
3746 refcount_read(&s->sk_refcnt),
3747 sk_rmem_alloc_get(s),
3748 sk_wmem_alloc_get(s),
3749 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3750 sock_i_ino(s)
3751 );
3752 return 0;
3753 }
3754
3755 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3756 __acquires(rcu)
3757 {
3758 struct net *net = seq_file_net(f);
3759 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3760
3761 rcu_read_lock();
3762 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3763 }
3764
3765 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3766 {
3767 struct net *net = seq_file_net(f);
3768 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3769
3770 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3771 }
3772
3773 static void pfkey_seq_stop(struct seq_file *f, void *v)
3774 __releases(rcu)
3775 {
3776 rcu_read_unlock();
3777 }
3778
3779 static const struct seq_operations pfkey_seq_ops = {
3780 .start = pfkey_seq_start,
3781 .next = pfkey_seq_next,
3782 .stop = pfkey_seq_stop,
3783 .show = pfkey_seq_show,
3784 };
3785
3786 static int pfkey_seq_open(struct inode *inode, struct file *file)
3787 {
3788 return seq_open_net(inode, file, &pfkey_seq_ops,
3789 sizeof(struct seq_net_private));
3790 }
3791
3792 static const struct file_operations pfkey_proc_ops = {
3793 .open = pfkey_seq_open,
3794 .read = seq_read,
3795 .llseek = seq_lseek,
3796 .release = seq_release_net,
3797 };
3798
3799 static int __net_init pfkey_init_proc(struct net *net)
3800 {
3801 struct proc_dir_entry *e;
3802
3803 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3804 if (e == NULL)
3805 return -ENOMEM;
3806
3807 return 0;
3808 }
3809
3810 static void __net_exit pfkey_exit_proc(struct net *net)
3811 {
3812 remove_proc_entry("pfkey", net->proc_net);
3813 }
3814 #else
3815 static inline int pfkey_init_proc(struct net *net)
3816 {
3817 return 0;
3818 }
3819
3820 static inline void pfkey_exit_proc(struct net *net)
3821 {
3822 }
3823 #endif
3824
3825 static struct xfrm_mgr pfkeyv2_mgr =
3826 {
3827 .notify = pfkey_send_notify,
3828 .acquire = pfkey_send_acquire,
3829 .compile_policy = pfkey_compile_policy,
3830 .new_mapping = pfkey_send_new_mapping,
3831 .notify_policy = pfkey_send_policy_notify,
3832 .migrate = pfkey_send_migrate,
3833 .is_alive = pfkey_is_alive,
3834 };
3835
3836 static int __net_init pfkey_net_init(struct net *net)
3837 {
3838 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3839 int rv;
3840
3841 INIT_HLIST_HEAD(&net_pfkey->table);
3842 atomic_set(&net_pfkey->socks_nr, 0);
3843
3844 rv = pfkey_init_proc(net);
3845
3846 return rv;
3847 }
3848
3849 static void __net_exit pfkey_net_exit(struct net *net)
3850 {
3851 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3852
3853 pfkey_exit_proc(net);
3854 BUG_ON(!hlist_empty(&net_pfkey->table));
3855 }
3856
3857 static struct pernet_operations pfkey_net_ops = {
3858 .init = pfkey_net_init,
3859 .exit = pfkey_net_exit,
3860 .id = &pfkey_net_id,
3861 .size = sizeof(struct netns_pfkey),
3862 };
3863
3864 static void __exit ipsec_pfkey_exit(void)
3865 {
3866 xfrm_unregister_km(&pfkeyv2_mgr);
3867 sock_unregister(PF_KEY);
3868 unregister_pernet_subsys(&pfkey_net_ops);
3869 proto_unregister(&key_proto);
3870 }
3871
3872 static int __init ipsec_pfkey_init(void)
3873 {
3874 int err = proto_register(&key_proto, 0);
3875
3876 if (err != 0)
3877 goto out;
3878
3879 err = register_pernet_subsys(&pfkey_net_ops);
3880 if (err != 0)
3881 goto out_unregister_key_proto;
3882 err = sock_register(&pfkey_family_ops);
3883 if (err != 0)
3884 goto out_unregister_pernet;
3885 err = xfrm_register_km(&pfkeyv2_mgr);
3886 if (err != 0)
3887 goto out_sock_unregister;
3888 out:
3889 return err;
3890
3891 out_sock_unregister:
3892 sock_unregister(PF_KEY);
3893 out_unregister_pernet:
3894 unregister_pernet_subsys(&pfkey_net_ops);
3895 out_unregister_key_proto:
3896 proto_unregister(&key_proto);
3897 goto out;
3898 }
3899
3900 module_init(ipsec_pfkey_init);
3901 module_exit(ipsec_pfkey_exit);
3902 MODULE_LICENSE("GPL");
3903 MODULE_ALIAS_NETPROTO(PF_KEY);
Ubuntu Artful kernel mirror