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Merge tag 'sound-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
[linux-2.6.git] / net / key / af_key.c
blob9da862070dd84fe596f77582c82af6eec8ad660c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*skb2)->len);
209 *skb2 = NULL;
210 err = 0;
211 }
212 }
213 sock_put(sk);
214 return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria. */
218 #define BROADCAST_ALL 0
219 #define BROADCAST_ONE 1
220 #define BROADCAST_REGISTERED 2
221 #define BROADCAST_PROMISC_ONLY 4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 int broadcast_flags, struct sock *one_sk,
224 struct net *net)
225 {
226 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 struct sock *sk;
228 struct sk_buff *skb2 = NULL;
229 int err = -ESRCH;
230
231 /* XXX Do we need something like netlink_overrun? I think
232 * XXX PF_KEY socket apps will not mind current behavior.
233 */
234 if (!skb)
235 return -ENOMEM;
236
237 rcu_read_lock();
238 sk_for_each_rcu(sk, &net_pfkey->table) {
239 struct pfkey_sock *pfk = pfkey_sk(sk);
240 int err2;
241
242 /* Yes, it means that if you are meant to receive this
243 * pfkey message you receive it twice as promiscuous
244 * socket.
245 */
246 if (pfk->promisc)
247 pfkey_broadcast_one(skb, &skb2, allocation, sk);
248
249 /* the exact target will be processed later */
250 if (sk == one_sk)
251 continue;
252 if (broadcast_flags != BROADCAST_ALL) {
253 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 continue;
255 if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 !pfk->registered)
257 continue;
258 if (broadcast_flags & BROADCAST_ONE)
259 continue;
260 }
261
262 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263
264 /* Error is cleare after succecful sending to at least one
265 * registered KM */
266 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 err = err2;
268 }
269 rcu_read_unlock();
270
271 if (one_sk != NULL)
272 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273
274 kfree_skb(skb2);
275 kfree_skb(skb);
276 return err;
277 }
278
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281 struct sadb_msg *hdr;
282 int rc;
283
284 rc = pfk->dump.dump(pfk);
285 if (rc == -ENOBUFS)
286 return 0;
287
288 if (pfk->dump.skb) {
289 if (!pfkey_can_dump(&pfk->sk))
290 return 0;
291
292 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293 hdr->sadb_msg_seq = 0;
294 hdr->sadb_msg_errno = rc;
295 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296 &pfk->sk, sock_net(&pfk->sk));
297 pfk->dump.skb = NULL;
298 }
299
300 pfkey_terminate_dump(pfk);
301 return rc;
302 }
303
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305 const struct sadb_msg *orig)
306 {
307 *new = *orig;
308 }
309
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313 struct sadb_msg *hdr;
314
315 if (!skb)
316 return -ENOBUFS;
317
318 /* Woe be to the platform trying to support PFKEY yet
319 * having normal errnos outside the 1-255 range, inclusive.
320 */
321 err = -err;
322 if (err == ERESTARTSYS ||
323 err == ERESTARTNOHAND ||
324 err == ERESTARTNOINTR)
325 err = EINTR;
326 if (err >= 512)
327 err = EINVAL;
328 BUG_ON(err <= 0 || err >= 256);
329
330 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331 pfkey_hdr_dup(hdr, orig);
332 hdr->sadb_msg_errno = (uint8_t) err;
333 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334 sizeof(uint64_t));
335
336 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338 return 0;
339 }
340
341 static u8 sadb_ext_min_len[] = {
342 [SADB_EXT_RESERVED] = (u8) 0,
343 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
344 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
345 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
348 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
351 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
353 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
355 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
356 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
357 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
359 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
360 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
361 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
362 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
363 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
364 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
366 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
367 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family. */
371 static int verify_address_len(const void *p)
372 {
373 const struct sadb_address *sp = p;
374 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
375 const struct sockaddr_in *sin;
376 #if IS_ENABLED(CONFIG_IPV6)
377 const struct sockaddr_in6 *sin6;
378 #endif
379 int len;
380
381 switch (addr->sa_family) {
382 case AF_INET:
383 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384 if (sp->sadb_address_len != len ||
385 sp->sadb_address_prefixlen > 32)
386 return -EINVAL;
387 break;
388 #if IS_ENABLED(CONFIG_IPV6)
389 case AF_INET6:
390 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391 if (sp->sadb_address_len != len ||
392 sp->sadb_address_prefixlen > 128)
393 return -EINVAL;
394 break;
395 #endif
396 default:
397 /* It is user using kernel to keep track of security
398 * associations for another protocol, such as
399 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
400 * lengths.
401 *
402 * XXX Actually, association/policy database is not yet
403 * XXX able to cope with arbitrary sockaddr families.
404 * XXX When it can, remove this -EINVAL. -DaveM
405 */
406 return -EINVAL;
407 break;
408 }
409
410 return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
414 {
415 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416 sec_ctx->sadb_x_ctx_len,
417 sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(const void *p)
421 {
422 const struct sadb_x_sec_ctx *sec_ctx = p;
423 int len = sec_ctx->sadb_x_ctx_len;
424
425 if (len > PAGE_SIZE)
426 return -EINVAL;
427
428 len = pfkey_sec_ctx_len(sec_ctx);
429
430 if (sec_ctx->sadb_x_sec_len != len)
431 return -EINVAL;
432
433 return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
437 {
438 struct xfrm_user_sec_ctx *uctx = NULL;
439 int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443 if (!uctx)
444 return NULL;
445
446 uctx->len = pfkey_sec_ctx_len(sec_ctx);
447 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451 memcpy(uctx + 1, sec_ctx + 1,
452 uctx->ctx_len);
453
454 return uctx;
455 }
456
457 static int present_and_same_family(const struct sadb_address *src,
458 const struct sadb_address *dst)
459 {
460 const struct sockaddr *s_addr, *d_addr;
461
462 if (!src || !dst)
463 return 0;
464
465 s_addr = (const struct sockaddr *)(src + 1);
466 d_addr = (const struct sockaddr *)(dst + 1);
467 if (s_addr->sa_family != d_addr->sa_family)
468 return 0;
469 if (s_addr->sa_family != AF_INET
470 #if IS_ENABLED(CONFIG_IPV6)
471 && s_addr->sa_family != AF_INET6
472 #endif
473 )
474 return 0;
475
476 return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
480 {
481 const char *p = (char *) hdr;
482 int len = skb->len;
483
484 len -= sizeof(*hdr);
485 p += sizeof(*hdr);
486 while (len > 0) {
487 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
488 uint16_t ext_type;
489 int ext_len;
490
491 ext_len = ehdr->sadb_ext_len;
492 ext_len *= sizeof(uint64_t);
493 ext_type = ehdr->sadb_ext_type;
494 if (ext_len < sizeof(uint64_t) ||
495 ext_len > len ||
496 ext_type == SADB_EXT_RESERVED)
497 return -EINVAL;
498
499 if (ext_type <= SADB_EXT_MAX) {
500 int min = (int) sadb_ext_min_len[ext_type];
501 if (ext_len < min)
502 return -EINVAL;
503 if (ext_hdrs[ext_type-1] != NULL)
504 return -EINVAL;
505 if (ext_type == SADB_EXT_ADDRESS_SRC ||
506 ext_type == SADB_EXT_ADDRESS_DST ||
507 ext_type == SADB_EXT_ADDRESS_PROXY ||
508 ext_type == SADB_X_EXT_NAT_T_OA) {
509 if (verify_address_len(p))
510 return -EINVAL;
511 }
512 if (ext_type == SADB_X_EXT_SEC_CTX) {
513 if (verify_sec_ctx_len(p))
514 return -EINVAL;
515 }
516 ext_hdrs[ext_type-1] = (void *) p;
517 }
518 p += ext_len;
519 len -= ext_len;
520 }
521
522 return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528 switch (satype) {
529 case SADB_SATYPE_UNSPEC:
530 return IPSEC_PROTO_ANY;
531 case SADB_SATYPE_AH:
532 return IPPROTO_AH;
533 case SADB_SATYPE_ESP:
534 return IPPROTO_ESP;
535 case SADB_X_SATYPE_IPCOMP:
536 return IPPROTO_COMP;
537 break;
538 default:
539 return 0;
540 }
541 /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547 switch (proto) {
548 case IPPROTO_AH:
549 return SADB_SATYPE_AH;
550 case IPPROTO_ESP:
551 return SADB_SATYPE_ESP;
552 case IPPROTO_COMP:
553 return SADB_X_SATYPE_IPCOMP;
554 break;
555 default:
556 return 0;
557 }
558 /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562 * say specifically 'just raw sockets' as we encode them as 255.
563 */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567 return proto == IPSEC_PROTO_ANY ? 0 : proto;
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572 return proto ? proto : IPSEC_PROTO_ANY;
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577 switch (family) {
578 case AF_INET:
579 return sizeof(struct sockaddr_in);
580 #if IS_ENABLED(CONFIG_IPV6)
581 case AF_INET6:
582 return sizeof(struct sockaddr_in6);
583 #endif
584 }
585 return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591 switch (sa->sa_family) {
592 case AF_INET:
593 xaddr->a4 =
594 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595 return AF_INET;
596 #if IS_ENABLED(CONFIG_IPV6)
597 case AF_INET6:
598 memcpy(xaddr->a6,
599 &((struct sockaddr_in6 *)sa)->sin6_addr,
600 sizeof(struct in6_addr));
601 return AF_INET6;
602 #endif
603 }
604 return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611 xaddr);
612 }
613
614 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
615 {
616 const struct sadb_sa *sa;
617 const struct sadb_address *addr;
618 uint16_t proto;
619 unsigned short family;
620 xfrm_address_t *xaddr;
621
622 sa = ext_hdrs[SADB_EXT_SA - 1];
623 if (sa == NULL)
624 return NULL;
625
626 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627 if (proto == 0)
628 return NULL;
629
630 /* sadb_address_len should be checked by caller */
631 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
632 if (addr == NULL)
633 return NULL;
634
635 family = ((const struct sockaddr *)(addr + 1))->sa_family;
636 switch (family) {
637 case AF_INET:
638 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
639 break;
640 #if IS_ENABLED(CONFIG_IPV6)
641 case AF_INET6:
642 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643 break;
644 #endif
645 default:
646 xaddr = NULL;
647 }
648
649 if (!xaddr)
650 return NULL;
651
652 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665 switch(mode) {
666 case XFRM_MODE_TRANSPORT:
667 return IPSEC_MODE_TRANSPORT;
668 case XFRM_MODE_TUNNEL:
669 return IPSEC_MODE_TUNNEL;
670 case XFRM_MODE_BEET:
671 return IPSEC_MODE_BEET;
672 default:
673 return -1;
674 }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679 switch(mode) {
680 case IPSEC_MODE_ANY: /*XXX*/
681 case IPSEC_MODE_TRANSPORT:
682 return XFRM_MODE_TRANSPORT;
683 case IPSEC_MODE_TUNNEL:
684 return XFRM_MODE_TUNNEL;
685 case IPSEC_MODE_BEET:
686 return XFRM_MODE_BEET;
687 default:
688 return -1;
689 }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
693 struct sockaddr *sa,
694 unsigned short family)
695 {
696 switch (family) {
697 case AF_INET:
698 {
699 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700 sin->sin_family = AF_INET;
701 sin->sin_port = port;
702 sin->sin_addr.s_addr = xaddr->a4;
703 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704 return 32;
705 }
706 #if IS_ENABLED(CONFIG_IPV6)
707 case AF_INET6:
708 {
709 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710 sin6->sin6_family = AF_INET6;
711 sin6->sin6_port = port;
712 sin6->sin6_flowinfo = 0;
713 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
714 sin6->sin6_scope_id = 0;
715 return 128;
716 }
717 #endif
718 }
719 return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
723 int add_keys, int hsc)
724 {
725 struct sk_buff *skb;
726 struct sadb_msg *hdr;
727 struct sadb_sa *sa;
728 struct sadb_lifetime *lifetime;
729 struct sadb_address *addr;
730 struct sadb_key *key;
731 struct sadb_x_sa2 *sa2;
732 struct sadb_x_sec_ctx *sec_ctx;
733 struct xfrm_sec_ctx *xfrm_ctx;
734 int ctx_size = 0;
735 int size;
736 int auth_key_size = 0;
737 int encrypt_key_size = 0;
738 int sockaddr_size;
739 struct xfrm_encap_tmpl *natt = NULL;
740 int mode;
741
742 /* address family check */
743 sockaddr_size = pfkey_sockaddr_size(x->props.family);
744 if (!sockaddr_size)
745 return ERR_PTR(-EINVAL);
746
747 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748 key(AE), (identity(SD),) (sensitivity)> */
749 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750 sizeof(struct sadb_lifetime) +
751 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753 sizeof(struct sadb_address)*2 +
754 sockaddr_size*2 +
755 sizeof(struct sadb_x_sa2);
756
757 if ((xfrm_ctx = x->security)) {
758 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760 }
761
762 /* identity & sensitivity */
763 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
764 size += sizeof(struct sadb_address) + sockaddr_size;
765
766 if (add_keys) {
767 if (x->aalg && x->aalg->alg_key_len) {
768 auth_key_size =
769 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770 size += sizeof(struct sadb_key) + auth_key_size;
771 }
772 if (x->ealg && x->ealg->alg_key_len) {
773 encrypt_key_size =
774 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775 size += sizeof(struct sadb_key) + encrypt_key_size;
776 }
777 }
778 if (x->encap)
779 natt = x->encap;
780
781 if (natt && natt->encap_type) {
782 size += sizeof(struct sadb_x_nat_t_type);
783 size += sizeof(struct sadb_x_nat_t_port);
784 size += sizeof(struct sadb_x_nat_t_port);
785 }
786
787 skb = alloc_skb(size + 16, GFP_ATOMIC);
788 if (skb == NULL)
789 return ERR_PTR(-ENOBUFS);
790
791 /* call should fill header later */
792 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793 memset(hdr, 0, size); /* XXX do we need this ? */
794 hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796 /* sa */
797 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
798 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799 sa->sadb_sa_exttype = SADB_EXT_SA;
800 sa->sadb_sa_spi = x->id.spi;
801 sa->sadb_sa_replay = x->props.replay_window;
802 switch (x->km.state) {
803 case XFRM_STATE_VALID:
804 sa->sadb_sa_state = x->km.dying ?
805 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806 break;
807 case XFRM_STATE_ACQ:
808 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809 break;
810 default:
811 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812 break;
813 }
814 sa->sadb_sa_auth = 0;
815 if (x->aalg) {
816 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
818 a->desc.sadb_alg_id : 0;
819 }
820 sa->sadb_sa_encrypt = 0;
821 BUG_ON(x->ealg && x->calg);
822 if (x->ealg) {
823 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
824 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
825 a->desc.sadb_alg_id : 0;
826 }
827 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
828 if (x->calg) {
829 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
830 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
831 a->desc.sadb_alg_id : 0;
832 }
833
834 sa->sadb_sa_flags = 0;
835 if (x->props.flags & XFRM_STATE_NOECN)
836 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
837 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
838 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
839 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
840 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
841
842 /* hard time */
843 if (hsc & 2) {
844 lifetime = (struct sadb_lifetime *) skb_put(skb,
845 sizeof(struct sadb_lifetime));
846 lifetime->sadb_lifetime_len =
847 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
848 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
849 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
850 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
851 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
852 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
853 }
854 /* soft time */
855 if (hsc & 1) {
856 lifetime = (struct sadb_lifetime *) skb_put(skb,
857 sizeof(struct sadb_lifetime));
858 lifetime->sadb_lifetime_len =
859 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
860 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
861 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
862 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
863 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
864 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
865 }
866 /* current time */
867 lifetime = (struct sadb_lifetime *) skb_put(skb,
868 sizeof(struct sadb_lifetime));
869 lifetime->sadb_lifetime_len =
870 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
871 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
872 lifetime->sadb_lifetime_allocations = x->curlft.packets;
873 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
874 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
875 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
876 /* src address */
877 addr = (struct sadb_address*) skb_put(skb,
878 sizeof(struct sadb_address)+sockaddr_size);
879 addr->sadb_address_len =
880 (sizeof(struct sadb_address)+sockaddr_size)/
881 sizeof(uint64_t);
882 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
883 /* "if the ports are non-zero, then the sadb_address_proto field,
884 normally zero, MUST be filled in with the transport
885 protocol's number." - RFC2367 */
886 addr->sadb_address_proto = 0;
887 addr->sadb_address_reserved = 0;
888
889 addr->sadb_address_prefixlen =
890 pfkey_sockaddr_fill(&x->props.saddr, 0,
891 (struct sockaddr *) (addr + 1),
892 x->props.family);
893 if (!addr->sadb_address_prefixlen)
894 BUG();
895
896 /* dst address */
897 addr = (struct sadb_address*) skb_put(skb,
898 sizeof(struct sadb_address)+sockaddr_size);
899 addr->sadb_address_len =
900 (sizeof(struct sadb_address)+sockaddr_size)/
901 sizeof(uint64_t);
902 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
903 addr->sadb_address_proto = 0;
904 addr->sadb_address_reserved = 0;
905
906 addr->sadb_address_prefixlen =
907 pfkey_sockaddr_fill(&x->id.daddr, 0,
908 (struct sockaddr *) (addr + 1),
909 x->props.family);
910 if (!addr->sadb_address_prefixlen)
911 BUG();
912
913 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
914 x->props.family)) {
915 addr = (struct sadb_address*) skb_put(skb,
916 sizeof(struct sadb_address)+sockaddr_size);
917 addr->sadb_address_len =
918 (sizeof(struct sadb_address)+sockaddr_size)/
919 sizeof(uint64_t);
920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
921 addr->sadb_address_proto =
922 pfkey_proto_from_xfrm(x->sel.proto);
923 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
924 addr->sadb_address_reserved = 0;
925
926 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
927 (struct sockaddr *) (addr + 1),
928 x->props.family);
929 }
930
931 /* auth key */
932 if (add_keys && auth_key_size) {
933 key = (struct sadb_key *) skb_put(skb,
934 sizeof(struct sadb_key)+auth_key_size);
935 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
936 sizeof(uint64_t);
937 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
938 key->sadb_key_bits = x->aalg->alg_key_len;
939 key->sadb_key_reserved = 0;
940 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
941 }
942 /* encrypt key */
943 if (add_keys && encrypt_key_size) {
944 key = (struct sadb_key *) skb_put(skb,
945 sizeof(struct sadb_key)+encrypt_key_size);
946 key->sadb_key_len = (sizeof(struct sadb_key) +
947 encrypt_key_size) / sizeof(uint64_t);
948 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
949 key->sadb_key_bits = x->ealg->alg_key_len;
950 key->sadb_key_reserved = 0;
951 memcpy(key + 1, x->ealg->alg_key,
952 (x->ealg->alg_key_len+7)/8);
953 }
954
955 /* sa */
956 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
957 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
958 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
959 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
960 kfree_skb(skb);
961 return ERR_PTR(-EINVAL);
962 }
963 sa2->sadb_x_sa2_mode = mode;
964 sa2->sadb_x_sa2_reserved1 = 0;
965 sa2->sadb_x_sa2_reserved2 = 0;
966 sa2->sadb_x_sa2_sequence = 0;
967 sa2->sadb_x_sa2_reqid = x->props.reqid;
968
969 if (natt && natt->encap_type) {
970 struct sadb_x_nat_t_type *n_type;
971 struct sadb_x_nat_t_port *n_port;
972
973 /* type */
974 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
975 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
976 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
977 n_type->sadb_x_nat_t_type_type = natt->encap_type;
978 n_type->sadb_x_nat_t_type_reserved[0] = 0;
979 n_type->sadb_x_nat_t_type_reserved[1] = 0;
980 n_type->sadb_x_nat_t_type_reserved[2] = 0;
981
982 /* source port */
983 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
984 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
985 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
986 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
987 n_port->sadb_x_nat_t_port_reserved = 0;
988
989 /* dest port */
990 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
991 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
992 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
993 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
994 n_port->sadb_x_nat_t_port_reserved = 0;
995 }
996
997 /* security context */
998 if (xfrm_ctx) {
999 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001 sec_ctx->sadb_x_sec_len =
1002 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008 xfrm_ctx->ctx_len);
1009 }
1010
1011 return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017 struct sk_buff *skb;
1018
1019 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021 return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025 int hsc)
1026 {
1027 return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031 const struct sadb_msg *hdr,
1032 void * const *ext_hdrs)
1033 {
1034 struct xfrm_state *x;
1035 const struct sadb_lifetime *lifetime;
1036 const struct sadb_sa *sa;
1037 const struct sadb_key *key;
1038 const struct sadb_x_sec_ctx *sec_ctx;
1039 uint16_t proto;
1040 int err;
1041
1042
1043 sa = ext_hdrs[SADB_EXT_SA - 1];
1044 if (!sa ||
1045 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047 return ERR_PTR(-EINVAL);
1048 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050 return ERR_PTR(-EINVAL);
1051 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053 return ERR_PTR(-EINVAL);
1054 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056 return ERR_PTR(-EINVAL);
1057
1058 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059 if (proto == 0)
1060 return ERR_PTR(-EINVAL);
1061
1062 /* default error is no buffer space */
1063 err = -ENOBUFS;
1064
1065 /* RFC2367:
1066
1067 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072 not true.
1073
1074 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076 */
1077 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081 return ERR_PTR(-EINVAL);
1082 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083 if (key != NULL &&
1084 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085 ((key->sadb_key_bits+7) / 8 == 0 ||
1086 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087 return ERR_PTR(-EINVAL);
1088 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089 if (key != NULL &&
1090 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091 ((key->sadb_key_bits+7) / 8 == 0 ||
1092 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093 return ERR_PTR(-EINVAL);
1094
1095 x = xfrm_state_alloc(net);
1096 if (x == NULL)
1097 return ERR_PTR(-ENOBUFS);
1098
1099 x->id.proto = proto;
1100 x->id.spi = sa->sadb_sa_spi;
1101 x->props.replay_window = sa->sadb_sa_replay;
1102 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103 x->props.flags |= XFRM_STATE_NOECN;
1104 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110 if (lifetime != NULL) {
1111 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115 }
1116 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117 if (lifetime != NULL) {
1118 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122 }
1123
1124 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125 if (sec_ctx != NULL) {
1126 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1127
1128 if (!uctx)
1129 goto out;
1130
1131 err = security_xfrm_state_alloc(x, uctx);
1132 kfree(uctx);
1133
1134 if (err)
1135 goto out;
1136 }
1137
1138 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139 if (sa->sadb_sa_auth) {
1140 int keysize = 0;
1141 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142 if (!a || !a->pfkey_supported) {
1143 err = -ENOSYS;
1144 goto out;
1145 }
1146 if (key)
1147 keysize = (key->sadb_key_bits + 7) / 8;
1148 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149 if (!x->aalg)
1150 goto out;
1151 strcpy(x->aalg->alg_name, a->name);
1152 x->aalg->alg_key_len = 0;
1153 if (key) {
1154 x->aalg->alg_key_len = key->sadb_key_bits;
1155 memcpy(x->aalg->alg_key, key+1, keysize);
1156 }
1157 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158 x->props.aalgo = sa->sadb_sa_auth;
1159 /* x->algo.flags = sa->sadb_sa_flags; */
1160 }
1161 if (sa->sadb_sa_encrypt) {
1162 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164 if (!a || !a->pfkey_supported) {
1165 err = -ENOSYS;
1166 goto out;
1167 }
1168 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169 if (!x->calg)
1170 goto out;
1171 strcpy(x->calg->alg_name, a->name);
1172 x->props.calgo = sa->sadb_sa_encrypt;
1173 } else {
1174 int keysize = 0;
1175 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176 if (!a || !a->pfkey_supported) {
1177 err = -ENOSYS;
1178 goto out;
1179 }
1180 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181 if (key)
1182 keysize = (key->sadb_key_bits + 7) / 8;
1183 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184 if (!x->ealg)
1185 goto out;
1186 strcpy(x->ealg->alg_name, a->name);
1187 x->ealg->alg_key_len = 0;
1188 if (key) {
1189 x->ealg->alg_key_len = key->sadb_key_bits;
1190 memcpy(x->ealg->alg_key, key+1, keysize);
1191 }
1192 x->props.ealgo = sa->sadb_sa_encrypt;
1193 }
1194 }
1195 /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198 &x->props.saddr);
1199 if (!x->props.family) {
1200 err = -EAFNOSUPPORT;
1201 goto out;
1202 }
1203 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1204 &x->id.daddr);
1205
1206 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1207 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1208 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1209 if (mode < 0) {
1210 err = -EINVAL;
1211 goto out;
1212 }
1213 x->props.mode = mode;
1214 x->props.reqid = sa2->sadb_x_sa2_reqid;
1215 }
1216
1217 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1218 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1219
1220 /* Nobody uses this, but we try. */
1221 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1222 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1223 }
1224
1225 if (!x->sel.family)
1226 x->sel.family = x->props.family;
1227
1228 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1229 const struct sadb_x_nat_t_type* n_type;
1230 struct xfrm_encap_tmpl *natt;
1231
1232 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1233 if (!x->encap)
1234 goto out;
1235
1236 natt = x->encap;
1237 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1238 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1239
1240 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1241 const struct sadb_x_nat_t_port *n_port =
1242 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1243 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1244 }
1245 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1246 const struct sadb_x_nat_t_port *n_port =
1247 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1248 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1249 }
1250 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1251 }
1252
1253 err = xfrm_init_state(x);
1254 if (err)
1255 goto out;
1256
1257 x->km.seq = hdr->sadb_msg_seq;
1258 return x;
1259
1260 out:
1261 x->km.state = XFRM_STATE_DEAD;
1262 xfrm_state_put(x);
1263 return ERR_PTR(err);
1264 }
1265
1266 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1267 {
1268 return -EOPNOTSUPP;
1269 }
1270
1271 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1272 {
1273 struct net *net = sock_net(sk);
1274 struct sk_buff *resp_skb;
1275 struct sadb_x_sa2 *sa2;
1276 struct sadb_address *saddr, *daddr;
1277 struct sadb_msg *out_hdr;
1278 struct sadb_spirange *range;
1279 struct xfrm_state *x = NULL;
1280 int mode;
1281 int err;
1282 u32 min_spi, max_spi;
1283 u32 reqid;
1284 u8 proto;
1285 unsigned short family;
1286 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1287
1288 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1289 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1290 return -EINVAL;
1291
1292 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1293 if (proto == 0)
1294 return -EINVAL;
1295
1296 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1297 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1298 if (mode < 0)
1299 return -EINVAL;
1300 reqid = sa2->sadb_x_sa2_reqid;
1301 } else {
1302 mode = 0;
1303 reqid = 0;
1304 }
1305
1306 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1307 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1308
1309 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1310 switch (family) {
1311 case AF_INET:
1312 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1313 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1314 break;
1315 #if IS_ENABLED(CONFIG_IPV6)
1316 case AF_INET6:
1317 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1318 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1319 break;
1320 #endif
1321 }
1322
1323 if (hdr->sadb_msg_seq) {
1324 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1325 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1326 xfrm_state_put(x);
1327 x = NULL;
1328 }
1329 }
1330
1331 if (!x)
1332 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1333
1334 if (x == NULL)
1335 return -ENOENT;
1336
1337 min_spi = 0x100;
1338 max_spi = 0x0fffffff;
1339
1340 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1341 if (range) {
1342 min_spi = range->sadb_spirange_min;
1343 max_spi = range->sadb_spirange_max;
1344 }
1345
1346 err = xfrm_alloc_spi(x, min_spi, max_spi);
1347 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1348
1349 if (IS_ERR(resp_skb)) {
1350 xfrm_state_put(x);
1351 return PTR_ERR(resp_skb);
1352 }
1353
1354 out_hdr = (struct sadb_msg *) resp_skb->data;
1355 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1356 out_hdr->sadb_msg_type = SADB_GETSPI;
1357 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1358 out_hdr->sadb_msg_errno = 0;
1359 out_hdr->sadb_msg_reserved = 0;
1360 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1361 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1362
1363 xfrm_state_put(x);
1364
1365 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1366
1367 return 0;
1368 }
1369
1370 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1371 {
1372 struct net *net = sock_net(sk);
1373 struct xfrm_state *x;
1374
1375 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1376 return -EOPNOTSUPP;
1377
1378 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1379 return 0;
1380
1381 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1382 if (x == NULL)
1383 return 0;
1384
1385 spin_lock_bh(&x->lock);
1386 if (x->km.state == XFRM_STATE_ACQ) {
1387 x->km.state = XFRM_STATE_ERROR;
1388 wake_up(&net->xfrm.km_waitq);
1389 }
1390 spin_unlock_bh(&x->lock);
1391 xfrm_state_put(x);
1392 return 0;
1393 }
1394
1395 static inline int event2poltype(int event)
1396 {
1397 switch (event) {
1398 case XFRM_MSG_DELPOLICY:
1399 return SADB_X_SPDDELETE;
1400 case XFRM_MSG_NEWPOLICY:
1401 return SADB_X_SPDADD;
1402 case XFRM_MSG_UPDPOLICY:
1403 return SADB_X_SPDUPDATE;
1404 case XFRM_MSG_POLEXPIRE:
1405 // return SADB_X_SPDEXPIRE;
1406 default:
1407 pr_err("pfkey: Unknown policy event %d\n", event);
1408 break;
1409 }
1410
1411 return 0;
1412 }
1413
1414 static inline int event2keytype(int event)
1415 {
1416 switch (event) {
1417 case XFRM_MSG_DELSA:
1418 return SADB_DELETE;
1419 case XFRM_MSG_NEWSA:
1420 return SADB_ADD;
1421 case XFRM_MSG_UPDSA:
1422 return SADB_UPDATE;
1423 case XFRM_MSG_EXPIRE:
1424 return SADB_EXPIRE;
1425 default:
1426 pr_err("pfkey: Unknown SA event %d\n", event);
1427 break;
1428 }
1429
1430 return 0;
1431 }
1432
1433 /* ADD/UPD/DEL */
1434 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1435 {
1436 struct sk_buff *skb;
1437 struct sadb_msg *hdr;
1438
1439 skb = pfkey_xfrm_state2msg(x);
1440
1441 if (IS_ERR(skb))
1442 return PTR_ERR(skb);
1443
1444 hdr = (struct sadb_msg *) skb->data;
1445 hdr->sadb_msg_version = PF_KEY_V2;
1446 hdr->sadb_msg_type = event2keytype(c->event);
1447 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1448 hdr->sadb_msg_errno = 0;
1449 hdr->sadb_msg_reserved = 0;
1450 hdr->sadb_msg_seq = c->seq;
1451 hdr->sadb_msg_pid = c->portid;
1452
1453 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1454
1455 return 0;
1456 }
1457
1458 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1459 {
1460 struct net *net = sock_net(sk);
1461 struct xfrm_state *x;
1462 int err;
1463 struct km_event c;
1464
1465 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1466 if (IS_ERR(x))
1467 return PTR_ERR(x);
1468
1469 xfrm_state_hold(x);
1470 if (hdr->sadb_msg_type == SADB_ADD)
1471 err = xfrm_state_add(x);
1472 else
1473 err = xfrm_state_update(x);
1474
1475 xfrm_audit_state_add(x, err ? 0 : 1,
1476 audit_get_loginuid(current),
1477 audit_get_sessionid(current), 0);
1478
1479 if (err < 0) {
1480 x->km.state = XFRM_STATE_DEAD;
1481 __xfrm_state_put(x);
1482 goto out;
1483 }
1484
1485 if (hdr->sadb_msg_type == SADB_ADD)
1486 c.event = XFRM_MSG_NEWSA;
1487 else
1488 c.event = XFRM_MSG_UPDSA;
1489 c.seq = hdr->sadb_msg_seq;
1490 c.portid = hdr->sadb_msg_pid;
1491 km_state_notify(x, &c);
1492 out:
1493 xfrm_state_put(x);
1494 return err;
1495 }
1496
1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499 struct net *net = sock_net(sk);
1500 struct xfrm_state *x;
1501 struct km_event c;
1502 int err;
1503
1504 if (!ext_hdrs[SADB_EXT_SA-1] ||
1505 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1506 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1507 return -EINVAL;
1508
1509 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1510 if (x == NULL)
1511 return -ESRCH;
1512
1513 if ((err = security_xfrm_state_delete(x)))
1514 goto out;
1515
1516 if (xfrm_state_kern(x)) {
1517 err = -EPERM;
1518 goto out;
1519 }
1520
1521 err = xfrm_state_delete(x);
1522
1523 if (err < 0)
1524 goto out;
1525
1526 c.seq = hdr->sadb_msg_seq;
1527 c.portid = hdr->sadb_msg_pid;
1528 c.event = XFRM_MSG_DELSA;
1529 km_state_notify(x, &c);
1530 out:
1531 xfrm_audit_state_delete(x, err ? 0 : 1,
1532 audit_get_loginuid(current),
1533 audit_get_sessionid(current), 0);
1534 xfrm_state_put(x);
1535
1536 return err;
1537 }
1538
1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1540 {
1541 struct net *net = sock_net(sk);
1542 __u8 proto;
1543 struct sk_buff *out_skb;
1544 struct sadb_msg *out_hdr;
1545 struct xfrm_state *x;
1546
1547 if (!ext_hdrs[SADB_EXT_SA-1] ||
1548 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550 return -EINVAL;
1551
1552 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553 if (x == NULL)
1554 return -ESRCH;
1555
1556 out_skb = pfkey_xfrm_state2msg(x);
1557 proto = x->id.proto;
1558 xfrm_state_put(x);
1559 if (IS_ERR(out_skb))
1560 return PTR_ERR(out_skb);
1561
1562 out_hdr = (struct sadb_msg *) out_skb->data;
1563 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1564 out_hdr->sadb_msg_type = SADB_GET;
1565 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1566 out_hdr->sadb_msg_errno = 0;
1567 out_hdr->sadb_msg_reserved = 0;
1568 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1569 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1570 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1571
1572 return 0;
1573 }
1574
1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1576 gfp_t allocation)
1577 {
1578 struct sk_buff *skb;
1579 struct sadb_msg *hdr;
1580 int len, auth_len, enc_len, i;
1581
1582 auth_len = xfrm_count_pfkey_auth_supported();
1583 if (auth_len) {
1584 auth_len *= sizeof(struct sadb_alg);
1585 auth_len += sizeof(struct sadb_supported);
1586 }
1587
1588 enc_len = xfrm_count_pfkey_enc_supported();
1589 if (enc_len) {
1590 enc_len *= sizeof(struct sadb_alg);
1591 enc_len += sizeof(struct sadb_supported);
1592 }
1593
1594 len = enc_len + auth_len + sizeof(struct sadb_msg);
1595
1596 skb = alloc_skb(len + 16, allocation);
1597 if (!skb)
1598 goto out_put_algs;
1599
1600 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1601 pfkey_hdr_dup(hdr, orig);
1602 hdr->sadb_msg_errno = 0;
1603 hdr->sadb_msg_len = len / sizeof(uint64_t);
1604
1605 if (auth_len) {
1606 struct sadb_supported *sp;
1607 struct sadb_alg *ap;
1608
1609 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1610 ap = (struct sadb_alg *) (sp + 1);
1611
1612 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1613 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1614
1615 for (i = 0; ; i++) {
1616 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1617 if (!aalg)
1618 break;
1619 if (!aalg->pfkey_supported)
1620 continue;
1621 if (aalg->available)
1622 *ap++ = aalg->desc;
1623 }
1624 }
1625
1626 if (enc_len) {
1627 struct sadb_supported *sp;
1628 struct sadb_alg *ap;
1629
1630 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1631 ap = (struct sadb_alg *) (sp + 1);
1632
1633 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1634 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1635
1636 for (i = 0; ; i++) {
1637 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1638 if (!ealg)
1639 break;
1640 if (!ealg->pfkey_supported)
1641 continue;
1642 if (ealg->available)
1643 *ap++ = ealg->desc;
1644 }
1645 }
1646
1647 out_put_algs:
1648 return skb;
1649 }
1650
1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1652 {
1653 struct pfkey_sock *pfk = pfkey_sk(sk);
1654 struct sk_buff *supp_skb;
1655
1656 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1657 return -EINVAL;
1658
1659 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1660 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1661 return -EEXIST;
1662 pfk->registered |= (1<<hdr->sadb_msg_satype);
1663 }
1664
1665 xfrm_probe_algs();
1666
1667 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1668 if (!supp_skb) {
1669 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1670 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1671
1672 return -ENOBUFS;
1673 }
1674
1675 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1676
1677 return 0;
1678 }
1679
1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 {
1682 struct sk_buff *skb;
1683 struct sadb_msg *hdr;
1684
1685 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1686 if (!skb)
1687 return -ENOBUFS;
1688
1689 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1690 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1691 hdr->sadb_msg_errno = (uint8_t) 0;
1692 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1693
1694 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1695 }
1696
1697 static int key_notify_sa_flush(const struct km_event *c)
1698 {
1699 struct sk_buff *skb;
1700 struct sadb_msg *hdr;
1701
1702 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1703 if (!skb)
1704 return -ENOBUFS;
1705 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1706 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1707 hdr->sadb_msg_type = SADB_FLUSH;
1708 hdr->sadb_msg_seq = c->seq;
1709 hdr->sadb_msg_pid = c->portid;
1710 hdr->sadb_msg_version = PF_KEY_V2;
1711 hdr->sadb_msg_errno = (uint8_t) 0;
1712 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713 hdr->sadb_msg_reserved = 0;
1714
1715 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716
1717 return 0;
1718 }
1719
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722 struct net *net = sock_net(sk);
1723 unsigned int proto;
1724 struct km_event c;
1725 struct xfrm_audit audit_info;
1726 int err, err2;
1727
1728 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729 if (proto == 0)
1730 return -EINVAL;
1731
1732 audit_info.loginuid = audit_get_loginuid(current);
1733 audit_info.sessionid = audit_get_sessionid(current);
1734 audit_info.secid = 0;
1735 err = xfrm_state_flush(net, proto, &audit_info);
1736 err2 = unicast_flush_resp(sk, hdr);
1737 if (err || err2) {
1738 if (err == -ESRCH) /* empty table - go quietly */
1739 err = 0;
1740 return err ? err : err2;
1741 }
1742
1743 c.data.proto = proto;
1744 c.seq = hdr->sadb_msg_seq;
1745 c.portid = hdr->sadb_msg_pid;
1746 c.event = XFRM_MSG_FLUSHSA;
1747 c.net = net;
1748 km_state_notify(NULL, &c);
1749
1750 return 0;
1751 }
1752
1753 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1754 {
1755 struct pfkey_sock *pfk = ptr;
1756 struct sk_buff *out_skb;
1757 struct sadb_msg *out_hdr;
1758
1759 if (!pfkey_can_dump(&pfk->sk))
1760 return -ENOBUFS;
1761
1762 out_skb = pfkey_xfrm_state2msg(x);
1763 if (IS_ERR(out_skb))
1764 return PTR_ERR(out_skb);
1765
1766 out_hdr = (struct sadb_msg *) out_skb->data;
1767 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1768 out_hdr->sadb_msg_type = SADB_DUMP;
1769 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1770 out_hdr->sadb_msg_errno = 0;
1771 out_hdr->sadb_msg_reserved = 0;
1772 out_hdr->sadb_msg_seq = count + 1;
1773 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1774
1775 if (pfk->dump.skb)
1776 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1777 &pfk->sk, sock_net(&pfk->sk));
1778 pfk->dump.skb = out_skb;
1779
1780 return 0;
1781 }
1782
1783 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1784 {
1785 struct net *net = sock_net(&pfk->sk);
1786 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1787 }
1788
1789 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1790 {
1791 xfrm_state_walk_done(&pfk->dump.u.state);
1792 }
1793
1794 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1795 {
1796 u8 proto;
1797 struct pfkey_sock *pfk = pfkey_sk(sk);
1798
1799 if (pfk->dump.dump != NULL)
1800 return -EBUSY;
1801
1802 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1803 if (proto == 0)
1804 return -EINVAL;
1805
1806 pfk->dump.msg_version = hdr->sadb_msg_version;
1807 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1808 pfk->dump.dump = pfkey_dump_sa;
1809 pfk->dump.done = pfkey_dump_sa_done;
1810 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1811
1812 return pfkey_do_dump(pfk);
1813 }
1814
1815 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1816 {
1817 struct pfkey_sock *pfk = pfkey_sk(sk);
1818 int satype = hdr->sadb_msg_satype;
1819 bool reset_errno = false;
1820
1821 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1822 reset_errno = true;
1823 if (satype != 0 && satype != 1)
1824 return -EINVAL;
1825 pfk->promisc = satype;
1826 }
1827 if (reset_errno && skb_cloned(skb))
1828 skb = skb_copy(skb, GFP_KERNEL);
1829 else
1830 skb = skb_clone(skb, GFP_KERNEL);
1831
1832 if (reset_errno && skb) {
1833 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1834 new_hdr->sadb_msg_errno = 0;
1835 }
1836
1837 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1838 return 0;
1839 }
1840
1841 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1842 {
1843 int i;
1844 u32 reqid = *(u32*)ptr;
1845
1846 for (i=0; i<xp->xfrm_nr; i++) {
1847 if (xp->xfrm_vec[i].reqid == reqid)
1848 return -EEXIST;
1849 }
1850 return 0;
1851 }
1852
1853 static u32 gen_reqid(struct net *net)
1854 {
1855 struct xfrm_policy_walk walk;
1856 u32 start;
1857 int rc;
1858 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1859
1860 start = reqid;
1861 do {
1862 ++reqid;
1863 if (reqid == 0)
1864 reqid = IPSEC_MANUAL_REQID_MAX+1;
1865 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1866 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1867 xfrm_policy_walk_done(&walk);
1868 if (rc != -EEXIST)
1869 return reqid;
1870 } while (reqid != start);
1871 return 0;
1872 }
1873
1874 static int
1875 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1876 {
1877 struct net *net = xp_net(xp);
1878 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1879 int mode;
1880
1881 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1882 return -ELOOP;
1883
1884 if (rq->sadb_x_ipsecrequest_mode == 0)
1885 return -EINVAL;
1886
1887 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1888 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1889 return -EINVAL;
1890 t->mode = mode;
1891 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1892 t->optional = 1;
1893 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1894 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1895 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1896 t->reqid = 0;
1897 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1898 return -ENOBUFS;
1899 }
1900
1901 /* addresses present only in tunnel mode */
1902 if (t->mode == XFRM_MODE_TUNNEL) {
1903 u8 *sa = (u8 *) (rq + 1);
1904 int family, socklen;
1905
1906 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1907 &t->saddr);
1908 if (!family)
1909 return -EINVAL;
1910
1911 socklen = pfkey_sockaddr_len(family);
1912 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1913 &t->id.daddr) != family)
1914 return -EINVAL;
1915 t->encap_family = family;
1916 } else
1917 t->encap_family = xp->family;
1918
1919 /* No way to set this via kame pfkey */
1920 t->allalgs = 1;
1921 xp->xfrm_nr++;
1922 return 0;
1923 }
1924
1925 static int
1926 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1927 {
1928 int err;
1929 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1930 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1931
1932 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1933 return -EINVAL;
1934
1935 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1936 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1937 return err;
1938 len -= rq->sadb_x_ipsecrequest_len;
1939 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1940 }
1941 return 0;
1942 }
1943
1944 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1945 {
1946 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1947
1948 if (xfrm_ctx) {
1949 int len = sizeof(struct sadb_x_sec_ctx);
1950 len += xfrm_ctx->ctx_len;
1951 return PFKEY_ALIGN8(len);
1952 }
1953 return 0;
1954 }
1955
1956 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1957 {
1958 const struct xfrm_tmpl *t;
1959 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1960 int socklen = 0;
1961 int i;
1962
1963 for (i=0; i<xp->xfrm_nr; i++) {
1964 t = xp->xfrm_vec + i;
1965 socklen += pfkey_sockaddr_len(t->encap_family);
1966 }
1967
1968 return sizeof(struct sadb_msg) +
1969 (sizeof(struct sadb_lifetime) * 3) +
1970 (sizeof(struct sadb_address) * 2) +
1971 (sockaddr_size * 2) +
1972 sizeof(struct sadb_x_policy) +
1973 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1974 (socklen * 2) +
1975 pfkey_xfrm_policy2sec_ctx_size(xp);
1976 }
1977
1978 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1979 {
1980 struct sk_buff *skb;
1981 int size;
1982
1983 size = pfkey_xfrm_policy2msg_size(xp);
1984
1985 skb = alloc_skb(size + 16, GFP_ATOMIC);
1986 if (skb == NULL)
1987 return ERR_PTR(-ENOBUFS);
1988
1989 return skb;
1990 }
1991
1992 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1993 {
1994 struct sadb_msg *hdr;
1995 struct sadb_address *addr;
1996 struct sadb_lifetime *lifetime;
1997 struct sadb_x_policy *pol;
1998 struct sadb_x_sec_ctx *sec_ctx;
1999 struct xfrm_sec_ctx *xfrm_ctx;
2000 int i;
2001 int size;
2002 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2003 int socklen = pfkey_sockaddr_len(xp->family);
2004
2005 size = pfkey_xfrm_policy2msg_size(xp);
2006
2007 /* call should fill header later */
2008 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2009 memset(hdr, 0, size); /* XXX do we need this ? */
2010
2011 /* src address */
2012 addr = (struct sadb_address*) skb_put(skb,
2013 sizeof(struct sadb_address)+sockaddr_size);
2014 addr->sadb_address_len =
2015 (sizeof(struct sadb_address)+sockaddr_size)/
2016 sizeof(uint64_t);
2017 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2018 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2019 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2020 addr->sadb_address_reserved = 0;
2021 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2022 xp->selector.sport,
2023 (struct sockaddr *) (addr + 1),
2024 xp->family))
2025 BUG();
2026
2027 /* dst address */
2028 addr = (struct sadb_address*) skb_put(skb,
2029 sizeof(struct sadb_address)+sockaddr_size);
2030 addr->sadb_address_len =
2031 (sizeof(struct sadb_address)+sockaddr_size)/
2032 sizeof(uint64_t);
2033 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2034 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2035 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2036 addr->sadb_address_reserved = 0;
2037
2038 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2039 (struct sockaddr *) (addr + 1),
2040 xp->family);
2041
2042 /* hard time */
2043 lifetime = (struct sadb_lifetime *) skb_put(skb,
2044 sizeof(struct sadb_lifetime));
2045 lifetime->sadb_lifetime_len =
2046 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2048 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2049 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2050 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2051 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2052 /* soft time */
2053 lifetime = (struct sadb_lifetime *) skb_put(skb,
2054 sizeof(struct sadb_lifetime));
2055 lifetime->sadb_lifetime_len =
2056 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2057 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2058 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2059 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2060 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2061 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2062 /* current time */
2063 lifetime = (struct sadb_lifetime *) skb_put(skb,
2064 sizeof(struct sadb_lifetime));
2065 lifetime->sadb_lifetime_len =
2066 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2067 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2068 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2069 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2070 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2071 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2072
2073 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2074 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2075 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2076 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2077 if (xp->action == XFRM_POLICY_ALLOW) {
2078 if (xp->xfrm_nr)
2079 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2080 else
2081 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2082 }
2083 pol->sadb_x_policy_dir = dir+1;
2084 pol->sadb_x_policy_id = xp->index;
2085 pol->sadb_x_policy_priority = xp->priority;
2086
2087 for (i=0; i<xp->xfrm_nr; i++) {
2088 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2089 struct sadb_x_ipsecrequest *rq;
2090 int req_size;
2091 int mode;
2092
2093 req_size = sizeof(struct sadb_x_ipsecrequest);
2094 if (t->mode == XFRM_MODE_TUNNEL) {
2095 socklen = pfkey_sockaddr_len(t->encap_family);
2096 req_size += socklen * 2;
2097 } else {
2098 size -= 2*socklen;
2099 }
2100 rq = (void*)skb_put(skb, req_size);
2101 pol->sadb_x_policy_len += req_size/8;
2102 memset(rq, 0, sizeof(*rq));
2103 rq->sadb_x_ipsecrequest_len = req_size;
2104 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2105 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2106 return -EINVAL;
2107 rq->sadb_x_ipsecrequest_mode = mode;
2108 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2109 if (t->reqid)
2110 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2111 if (t->optional)
2112 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2113 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2114
2115 if (t->mode == XFRM_MODE_TUNNEL) {
2116 u8 *sa = (void *)(rq + 1);
2117 pfkey_sockaddr_fill(&t->saddr, 0,
2118 (struct sockaddr *)sa,
2119 t->encap_family);
2120 pfkey_sockaddr_fill(&t->id.daddr, 0,
2121 (struct sockaddr *) (sa + socklen),
2122 t->encap_family);
2123 }
2124 }
2125
2126 /* security context */
2127 if ((xfrm_ctx = xp->security)) {
2128 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2129
2130 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2131 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2132 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2133 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2134 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2135 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2136 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2137 xfrm_ctx->ctx_len);
2138 }
2139
2140 hdr->sadb_msg_len = size / sizeof(uint64_t);
2141 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2142
2143 return 0;
2144 }
2145
2146 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2147 {
2148 struct sk_buff *out_skb;
2149 struct sadb_msg *out_hdr;
2150 int err;
2151
2152 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2153 if (IS_ERR(out_skb))
2154 return PTR_ERR(out_skb);
2155
2156 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2157 if (err < 0)
2158 return err;
2159
2160 out_hdr = (struct sadb_msg *) out_skb->data;
2161 out_hdr->sadb_msg_version = PF_KEY_V2;
2162
2163 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2164 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2165 else
2166 out_hdr->sadb_msg_type = event2poltype(c->event);
2167 out_hdr->sadb_msg_errno = 0;
2168 out_hdr->sadb_msg_seq = c->seq;
2169 out_hdr->sadb_msg_pid = c->portid;
2170 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2171 return 0;
2172
2173 }
2174
2175 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2176 {
2177 struct net *net = sock_net(sk);
2178 int err = 0;
2179 struct sadb_lifetime *lifetime;
2180 struct sadb_address *sa;
2181 struct sadb_x_policy *pol;
2182 struct xfrm_policy *xp;
2183 struct km_event c;
2184 struct sadb_x_sec_ctx *sec_ctx;
2185
2186 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2188 !ext_hdrs[SADB_X_EXT_POLICY-1])
2189 return -EINVAL;
2190
2191 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2192 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2193 return -EINVAL;
2194 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2195 return -EINVAL;
2196
2197 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2198 if (xp == NULL)
2199 return -ENOBUFS;
2200
2201 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2202 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2203 xp->priority = pol->sadb_x_policy_priority;
2204
2205 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2206 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2207 if (!xp->family) {
2208 err = -EINVAL;
2209 goto out;
2210 }
2211 xp->selector.family = xp->family;
2212 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2213 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2214 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2215 if (xp->selector.sport)
2216 xp->selector.sport_mask = htons(0xffff);
2217
2218 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2219 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2220 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2221
2222 /* Amusing, we set this twice. KAME apps appear to set same value
2223 * in both addresses.
2224 */
2225 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226
2227 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2228 if (xp->selector.dport)
2229 xp->selector.dport_mask = htons(0xffff);
2230
2231 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2232 if (sec_ctx != NULL) {
2233 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2234
2235 if (!uctx) {
2236 err = -ENOBUFS;
2237 goto out;
2238 }
2239
2240 err = security_xfrm_policy_alloc(&xp->security, uctx);
2241 kfree(uctx);
2242
2243 if (err)
2244 goto out;
2245 }
2246
2247 xp->lft.soft_byte_limit = XFRM_INF;
2248 xp->lft.hard_byte_limit = XFRM_INF;
2249 xp->lft.soft_packet_limit = XFRM_INF;
2250 xp->lft.hard_packet_limit = XFRM_INF;
2251 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2252 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256 }
2257 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2258 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2259 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2260 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2261 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2262 }
2263 xp->xfrm_nr = 0;
2264 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2265 (err = parse_ipsecrequests(xp, pol)) < 0)
2266 goto out;
2267
2268 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2269 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2270
2271 xfrm_audit_policy_add(xp, err ? 0 : 1,
2272 audit_get_loginuid(current),
2273 audit_get_sessionid(current), 0);
2274
2275 if (err)
2276 goto out;
2277
2278 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2279 c.event = XFRM_MSG_UPDPOLICY;
2280 else
2281 c.event = XFRM_MSG_NEWPOLICY;
2282
2283 c.seq = hdr->sadb_msg_seq;
2284 c.portid = hdr->sadb_msg_pid;
2285
2286 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2287 xfrm_pol_put(xp);
2288 return 0;
2289
2290 out:
2291 xp->walk.dead = 1;
2292 xfrm_policy_destroy(xp);
2293 return err;
2294 }
2295
2296 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2297 {
2298 struct net *net = sock_net(sk);
2299 int err;
2300 struct sadb_address *sa;
2301 struct sadb_x_policy *pol;
2302 struct xfrm_policy *xp;
2303 struct xfrm_selector sel;
2304 struct km_event c;
2305 struct sadb_x_sec_ctx *sec_ctx;
2306 struct xfrm_sec_ctx *pol_ctx = NULL;
2307
2308 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2309 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2310 !ext_hdrs[SADB_X_EXT_POLICY-1])
2311 return -EINVAL;
2312
2313 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2314 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2315 return -EINVAL;
2316
2317 memset(&sel, 0, sizeof(sel));
2318
2319 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2320 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2321 sel.prefixlen_s = sa->sadb_address_prefixlen;
2322 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2323 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2324 if (sel.sport)
2325 sel.sport_mask = htons(0xffff);
2326
2327 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2328 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2329 sel.prefixlen_d = sa->sadb_address_prefixlen;
2330 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332 if (sel.dport)
2333 sel.dport_mask = htons(0xffff);
2334
2335 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2336 if (sec_ctx != NULL) {
2337 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2338
2339 if (!uctx)
2340 return -ENOMEM;
2341
2342 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2343 kfree(uctx);
2344 if (err)
2345 return err;
2346 }
2347
2348 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2349 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2350 1, &err);
2351 security_xfrm_policy_free(pol_ctx);
2352 if (xp == NULL)
2353 return -ENOENT;
2354
2355 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2356 audit_get_loginuid(current),
2357 audit_get_sessionid(current), 0);
2358
2359 if (err)
2360 goto out;
2361
2362 c.seq = hdr->sadb_msg_seq;
2363 c.portid = hdr->sadb_msg_pid;
2364 c.data.byid = 0;
2365 c.event = XFRM_MSG_DELPOLICY;
2366 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367
2368 out:
2369 xfrm_pol_put(xp);
2370 if (err == 0)
2371 xfrm_garbage_collect(net);
2372 return err;
2373 }
2374
2375 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2376 {
2377 int err;
2378 struct sk_buff *out_skb;
2379 struct sadb_msg *out_hdr;
2380 err = 0;
2381
2382 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2383 if (IS_ERR(out_skb)) {
2384 err = PTR_ERR(out_skb);
2385 goto out;
2386 }
2387 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2388 if (err < 0)
2389 goto out;
2390
2391 out_hdr = (struct sadb_msg *) out_skb->data;
2392 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2393 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2394 out_hdr->sadb_msg_satype = 0;
2395 out_hdr->sadb_msg_errno = 0;
2396 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2397 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2398 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2399 err = 0;
2400
2401 out:
2402 return err;
2403 }
2404
2405 #ifdef CONFIG_NET_KEY_MIGRATE
2406 static int pfkey_sockaddr_pair_size(sa_family_t family)
2407 {
2408 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2409 }
2410
2411 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2412 xfrm_address_t *saddr, xfrm_address_t *daddr,
2413 u16 *family)
2414 {
2415 int af, socklen;
2416
2417 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2418 return -EINVAL;
2419
2420 af = pfkey_sockaddr_extract(sa, saddr);
2421 if (!af)
2422 return -EINVAL;
2423
2424 socklen = pfkey_sockaddr_len(af);
2425 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2426 daddr) != af)
2427 return -EINVAL;
2428
2429 *family = af;
2430 return 0;
2431 }
2432
2433 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2434 struct xfrm_migrate *m)
2435 {
2436 int err;
2437 struct sadb_x_ipsecrequest *rq2;
2438 int mode;
2439
2440 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2441 len < rq1->sadb_x_ipsecrequest_len)
2442 return -EINVAL;
2443
2444 /* old endoints */
2445 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2446 rq1->sadb_x_ipsecrequest_len,
2447 &m->old_saddr, &m->old_daddr,
2448 &m->old_family);
2449 if (err)
2450 return err;
2451
2452 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2453 len -= rq1->sadb_x_ipsecrequest_len;
2454
2455 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2456 len < rq2->sadb_x_ipsecrequest_len)
2457 return -EINVAL;
2458
2459 /* new endpoints */
2460 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2461 rq2->sadb_x_ipsecrequest_len,
2462 &m->new_saddr, &m->new_daddr,
2463 &m->new_family);
2464 if (err)
2465 return err;
2466
2467 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2468 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2469 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2470 return -EINVAL;
2471
2472 m->proto = rq1->sadb_x_ipsecrequest_proto;
2473 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2474 return -EINVAL;
2475 m->mode = mode;
2476 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2477
2478 return ((int)(rq1->sadb_x_ipsecrequest_len +
2479 rq2->sadb_x_ipsecrequest_len));
2480 }
2481
2482 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2483 const struct sadb_msg *hdr, void * const *ext_hdrs)
2484 {
2485 int i, len, ret, err = -EINVAL;
2486 u8 dir;
2487 struct sadb_address *sa;
2488 struct sadb_x_kmaddress *kma;
2489 struct sadb_x_policy *pol;
2490 struct sadb_x_ipsecrequest *rq;
2491 struct xfrm_selector sel;
2492 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2493 struct xfrm_kmaddress k;
2494
2495 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2496 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2497 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2498 err = -EINVAL;
2499 goto out;
2500 }
2501
2502 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2503 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2504
2505 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2506 err = -EINVAL;
2507 goto out;
2508 }
2509
2510 if (kma) {
2511 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2512 k.reserved = kma->sadb_x_kmaddress_reserved;
2513 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2514 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2515 &k.local, &k.remote, &k.family);
2516 if (ret < 0) {
2517 err = ret;
2518 goto out;
2519 }
2520 }
2521
2522 dir = pol->sadb_x_policy_dir - 1;
2523 memset(&sel, 0, sizeof(sel));
2524
2525 /* set source address info of selector */
2526 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2527 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2528 sel.prefixlen_s = sa->sadb_address_prefixlen;
2529 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2530 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2531 if (sel.sport)
2532 sel.sport_mask = htons(0xffff);
2533
2534 /* set destination address info of selector */
2535 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2536 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2537 sel.prefixlen_d = sa->sadb_address_prefixlen;
2538 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2539 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2540 if (sel.dport)
2541 sel.dport_mask = htons(0xffff);
2542
2543 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2544
2545 /* extract ipsecrequests */
2546 i = 0;
2547 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2548
2549 while (len > 0 && i < XFRM_MAX_DEPTH) {
2550 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2551 if (ret < 0) {
2552 err = ret;
2553 goto out;
2554 } else {
2555 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2556 len -= ret;
2557 i++;
2558 }
2559 }
2560
2561 if (!i || len > 0) {
2562 err = -EINVAL;
2563 goto out;
2564 }
2565
2566 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2567 kma ? &k : NULL);
2568
2569 out:
2570 return err;
2571 }
2572 #else
2573 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2574 const struct sadb_msg *hdr, void * const *ext_hdrs)
2575 {
2576 return -ENOPROTOOPT;
2577 }
2578 #endif
2579
2580
2581 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2582 {
2583 struct net *net = sock_net(sk);
2584 unsigned int dir;
2585 int err = 0, delete;
2586 struct sadb_x_policy *pol;
2587 struct xfrm_policy *xp;
2588 struct km_event c;
2589
2590 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2591 return -EINVAL;
2592
2593 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2594 if (dir >= XFRM_POLICY_MAX)
2595 return -EINVAL;
2596
2597 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2598 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2599 dir, pol->sadb_x_policy_id, delete, &err);
2600 if (xp == NULL)
2601 return -ENOENT;
2602
2603 if (delete) {
2604 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2605 audit_get_loginuid(current),
2606 audit_get_sessionid(current), 0);
2607
2608 if (err)
2609 goto out;
2610 c.seq = hdr->sadb_msg_seq;
2611 c.portid = hdr->sadb_msg_pid;
2612 c.data.byid = 1;
2613 c.event = XFRM_MSG_DELPOLICY;
2614 km_policy_notify(xp, dir, &c);
2615 } else {
2616 err = key_pol_get_resp(sk, xp, hdr, dir);
2617 }
2618
2619 out:
2620 xfrm_pol_put(xp);
2621 if (delete && err == 0)
2622 xfrm_garbage_collect(net);
2623 return err;
2624 }
2625
2626 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2627 {
2628 struct pfkey_sock *pfk = ptr;
2629 struct sk_buff *out_skb;
2630 struct sadb_msg *out_hdr;
2631 int err;
2632
2633 if (!pfkey_can_dump(&pfk->sk))
2634 return -ENOBUFS;
2635
2636 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2637 if (IS_ERR(out_skb))
2638 return PTR_ERR(out_skb);
2639
2640 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2641 if (err < 0)
2642 return err;
2643
2644 out_hdr = (struct sadb_msg *) out_skb->data;
2645 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2646 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2647 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2648 out_hdr->sadb_msg_errno = 0;
2649 out_hdr->sadb_msg_seq = count + 1;
2650 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2651
2652 if (pfk->dump.skb)
2653 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2654 &pfk->sk, sock_net(&pfk->sk));
2655 pfk->dump.skb = out_skb;
2656
2657 return 0;
2658 }
2659
2660 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2661 {
2662 struct net *net = sock_net(&pfk->sk);
2663 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2664 }
2665
2666 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2667 {
2668 xfrm_policy_walk_done(&pfk->dump.u.policy);
2669 }
2670
2671 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2672 {
2673 struct pfkey_sock *pfk = pfkey_sk(sk);
2674
2675 if (pfk->dump.dump != NULL)
2676 return -EBUSY;
2677
2678 pfk->dump.msg_version = hdr->sadb_msg_version;
2679 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2680 pfk->dump.dump = pfkey_dump_sp;
2681 pfk->dump.done = pfkey_dump_sp_done;
2682 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2683
2684 return pfkey_do_dump(pfk);
2685 }
2686
2687 static int key_notify_policy_flush(const struct km_event *c)
2688 {
2689 struct sk_buff *skb_out;
2690 struct sadb_msg *hdr;
2691
2692 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2693 if (!skb_out)
2694 return -ENOBUFS;
2695 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2696 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2697 hdr->sadb_msg_seq = c->seq;
2698 hdr->sadb_msg_pid = c->portid;
2699 hdr->sadb_msg_version = PF_KEY_V2;
2700 hdr->sadb_msg_errno = (uint8_t) 0;
2701 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2702 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2703 hdr->sadb_msg_reserved = 0;
2704 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2705 return 0;
2706
2707 }
2708
2709 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2710 {
2711 struct net *net = sock_net(sk);
2712 struct km_event c;
2713 struct xfrm_audit audit_info;
2714 int err, err2;
2715
2716 audit_info.loginuid = audit_get_loginuid(current);
2717 audit_info.sessionid = audit_get_sessionid(current);
2718 audit_info.secid = 0;
2719 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2720 err2 = unicast_flush_resp(sk, hdr);
2721 if (err || err2) {
2722 if (err == -ESRCH) /* empty table - old silent behavior */
2723 return 0;
2724 return err;
2725 }
2726
2727 c.data.type = XFRM_POLICY_TYPE_MAIN;
2728 c.event = XFRM_MSG_FLUSHPOLICY;
2729 c.portid = hdr->sadb_msg_pid;
2730 c.seq = hdr->sadb_msg_seq;
2731 c.net = net;
2732 km_policy_notify(NULL, 0, &c);
2733
2734 return 0;
2735 }
2736
2737 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2738 const struct sadb_msg *hdr, void * const *ext_hdrs);
2739 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2740 [SADB_RESERVED] = pfkey_reserved,
2741 [SADB_GETSPI] = pfkey_getspi,
2742 [SADB_UPDATE] = pfkey_add,
2743 [SADB_ADD] = pfkey_add,
2744 [SADB_DELETE] = pfkey_delete,
2745 [SADB_GET] = pfkey_get,
2746 [SADB_ACQUIRE] = pfkey_acquire,
2747 [SADB_REGISTER] = pfkey_register,
2748 [SADB_EXPIRE] = NULL,
2749 [SADB_FLUSH] = pfkey_flush,
2750 [SADB_DUMP] = pfkey_dump,
2751 [SADB_X_PROMISC] = pfkey_promisc,
2752 [SADB_X_PCHANGE] = NULL,
2753 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2754 [SADB_X_SPDADD] = pfkey_spdadd,
2755 [SADB_X_SPDDELETE] = pfkey_spddelete,
2756 [SADB_X_SPDGET] = pfkey_spdget,
2757 [SADB_X_SPDACQUIRE] = NULL,
2758 [SADB_X_SPDDUMP] = pfkey_spddump,
2759 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2760 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2761 [SADB_X_SPDDELETE2] = pfkey_spdget,
2762 [SADB_X_MIGRATE] = pfkey_migrate,
2763 };
2764
2765 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2766 {
2767 void *ext_hdrs[SADB_EXT_MAX];
2768 int err;
2769
2770 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2771 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2772
2773 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2774 err = parse_exthdrs(skb, hdr, ext_hdrs);
2775 if (!err) {
2776 err = -EOPNOTSUPP;
2777 if (pfkey_funcs[hdr->sadb_msg_type])
2778 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2779 }
2780 return err;
2781 }
2782
2783 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2784 {
2785 struct sadb_msg *hdr = NULL;
2786
2787 if (skb->len < sizeof(*hdr)) {
2788 *errp = -EMSGSIZE;
2789 } else {
2790 hdr = (struct sadb_msg *) skb->data;
2791 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2792 hdr->sadb_msg_reserved != 0 ||
2793 (hdr->sadb_msg_type <= SADB_RESERVED ||
2794 hdr->sadb_msg_type > SADB_MAX)) {
2795 hdr = NULL;
2796 *errp = -EINVAL;
2797 } else if (hdr->sadb_msg_len != (skb->len /
2798 sizeof(uint64_t)) ||
2799 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2800 sizeof(uint64_t))) {
2801 hdr = NULL;
2802 *errp = -EMSGSIZE;
2803 } else {
2804 *errp = 0;
2805 }
2806 }
2807 return hdr;
2808 }
2809
2810 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2811 const struct xfrm_algo_desc *d)
2812 {
2813 unsigned int id = d->desc.sadb_alg_id;
2814
2815 if (id >= sizeof(t->aalgos) * 8)
2816 return 0;
2817
2818 return (t->aalgos >> id) & 1;
2819 }
2820
2821 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2822 const struct xfrm_algo_desc *d)
2823 {
2824 unsigned int id = d->desc.sadb_alg_id;
2825
2826 if (id >= sizeof(t->ealgos) * 8)
2827 return 0;
2828
2829 return (t->ealgos >> id) & 1;
2830 }
2831
2832 static int count_ah_combs(const struct xfrm_tmpl *t)
2833 {
2834 int i, sz = 0;
2835
2836 for (i = 0; ; i++) {
2837 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2838 if (!aalg)
2839 break;
2840 if (!aalg->pfkey_supported)
2841 continue;
2842 if (aalg_tmpl_set(t, aalg) && aalg->available)
2843 sz += sizeof(struct sadb_comb);
2844 }
2845 return sz + sizeof(struct sadb_prop);
2846 }
2847
2848 static int count_esp_combs(const struct xfrm_tmpl *t)
2849 {
2850 int i, k, sz = 0;
2851
2852 for (i = 0; ; i++) {
2853 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2854 if (!ealg)
2855 break;
2856
2857 if (!ealg->pfkey_supported)
2858 continue;
2859
2860 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2861 continue;
2862
2863 for (k = 1; ; k++) {
2864 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2865 if (!aalg)
2866 break;
2867
2868 if (!aalg->pfkey_supported)
2869 continue;
2870
2871 if (aalg_tmpl_set(t, aalg) && aalg->available)
2872 sz += sizeof(struct sadb_comb);
2873 }
2874 }
2875 return sz + sizeof(struct sadb_prop);
2876 }
2877
2878 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2879 {
2880 struct sadb_prop *p;
2881 int i;
2882
2883 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2884 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2885 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2886 p->sadb_prop_replay = 32;
2887 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2888
2889 for (i = 0; ; i++) {
2890 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2891 if (!aalg)
2892 break;
2893
2894 if (!aalg->pfkey_supported)
2895 continue;
2896
2897 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2898 struct sadb_comb *c;
2899 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2900 memset(c, 0, sizeof(*c));
2901 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2902 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2903 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2904 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2905 c->sadb_comb_hard_addtime = 24*60*60;
2906 c->sadb_comb_soft_addtime = 20*60*60;
2907 c->sadb_comb_hard_usetime = 8*60*60;
2908 c->sadb_comb_soft_usetime = 7*60*60;
2909 }
2910 }
2911 }
2912
2913 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2914 {
2915 struct sadb_prop *p;
2916 int i, k;
2917
2918 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2919 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2920 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2921 p->sadb_prop_replay = 32;
2922 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2923
2924 for (i=0; ; i++) {
2925 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2926 if (!ealg)
2927 break;
2928
2929 if (!ealg->pfkey_supported)
2930 continue;
2931
2932 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2933 continue;
2934
2935 for (k = 1; ; k++) {
2936 struct sadb_comb *c;
2937 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2938 if (!aalg)
2939 break;
2940 if (!aalg->pfkey_supported)
2941 continue;
2942 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2943 continue;
2944 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2945 memset(c, 0, sizeof(*c));
2946 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2947 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2948 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2949 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2950 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2951 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2952 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2953 c->sadb_comb_hard_addtime = 24*60*60;
2954 c->sadb_comb_soft_addtime = 20*60*60;
2955 c->sadb_comb_hard_usetime = 8*60*60;
2956 c->sadb_comb_soft_usetime = 7*60*60;
2957 }
2958 }
2959 }
2960
2961 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2962 {
2963 return 0;
2964 }
2965
2966 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2967 {
2968 struct sk_buff *out_skb;
2969 struct sadb_msg *out_hdr;
2970 int hard;
2971 int hsc;
2972
2973 hard = c->data.hard;
2974 if (hard)
2975 hsc = 2;
2976 else
2977 hsc = 1;
2978
2979 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2980 if (IS_ERR(out_skb))
2981 return PTR_ERR(out_skb);
2982
2983 out_hdr = (struct sadb_msg *) out_skb->data;
2984 out_hdr->sadb_msg_version = PF_KEY_V2;
2985 out_hdr->sadb_msg_type = SADB_EXPIRE;
2986 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2987 out_hdr->sadb_msg_errno = 0;
2988 out_hdr->sadb_msg_reserved = 0;
2989 out_hdr->sadb_msg_seq = 0;
2990 out_hdr->sadb_msg_pid = 0;
2991
2992 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2993 return 0;
2994 }
2995
2996 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2997 {
2998 struct net *net = x ? xs_net(x) : c->net;
2999 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3000
3001 if (atomic_read(&net_pfkey->socks_nr) == 0)
3002 return 0;
3003
3004 switch (c->event) {
3005 case XFRM_MSG_EXPIRE:
3006 return key_notify_sa_expire(x, c);
3007 case XFRM_MSG_DELSA:
3008 case XFRM_MSG_NEWSA:
3009 case XFRM_MSG_UPDSA:
3010 return key_notify_sa(x, c);
3011 case XFRM_MSG_FLUSHSA:
3012 return key_notify_sa_flush(c);
3013 case XFRM_MSG_NEWAE: /* not yet supported */
3014 break;
3015 default:
3016 pr_err("pfkey: Unknown SA event %d\n", c->event);
3017 break;
3018 }
3019
3020 return 0;
3021 }
3022
3023 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3024 {
3025 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3026 return 0;
3027
3028 switch (c->event) {
3029 case XFRM_MSG_POLEXPIRE:
3030 return key_notify_policy_expire(xp, c);
3031 case XFRM_MSG_DELPOLICY:
3032 case XFRM_MSG_NEWPOLICY:
3033 case XFRM_MSG_UPDPOLICY:
3034 return key_notify_policy(xp, dir, c);
3035 case XFRM_MSG_FLUSHPOLICY:
3036 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3037 break;
3038 return key_notify_policy_flush(c);
3039 default:
3040 pr_err("pfkey: Unknown policy event %d\n", c->event);
3041 break;
3042 }
3043
3044 return 0;
3045 }
3046
3047 static u32 get_acqseq(void)
3048 {
3049 u32 res;
3050 static atomic_t acqseq;
3051
3052 do {
3053 res = atomic_inc_return(&acqseq);
3054 } while (!res);
3055 return res;
3056 }
3057
3058 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3059 {
3060 struct sk_buff *skb;
3061 struct sadb_msg *hdr;
3062 struct sadb_address *addr;
3063 struct sadb_x_policy *pol;
3064 int sockaddr_size;
3065 int size;
3066 struct sadb_x_sec_ctx *sec_ctx;
3067 struct xfrm_sec_ctx *xfrm_ctx;
3068 int ctx_size = 0;
3069
3070 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3071 if (!sockaddr_size)
3072 return -EINVAL;
3073
3074 size = sizeof(struct sadb_msg) +
3075 (sizeof(struct sadb_address) * 2) +
3076 (sockaddr_size * 2) +
3077 sizeof(struct sadb_x_policy);
3078
3079 if (x->id.proto == IPPROTO_AH)
3080 size += count_ah_combs(t);
3081 else if (x->id.proto == IPPROTO_ESP)
3082 size += count_esp_combs(t);
3083
3084 if ((xfrm_ctx = x->security)) {
3085 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3086 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3087 }
3088
3089 skb = alloc_skb(size + 16, GFP_ATOMIC);
3090 if (skb == NULL)
3091 return -ENOMEM;
3092
3093 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3094 hdr->sadb_msg_version = PF_KEY_V2;
3095 hdr->sadb_msg_type = SADB_ACQUIRE;
3096 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3097 hdr->sadb_msg_len = size / sizeof(uint64_t);
3098 hdr->sadb_msg_errno = 0;
3099 hdr->sadb_msg_reserved = 0;
3100 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3101 hdr->sadb_msg_pid = 0;
3102
3103 /* src address */
3104 addr = (struct sadb_address*) skb_put(skb,
3105 sizeof(struct sadb_address)+sockaddr_size);
3106 addr->sadb_address_len =
3107 (sizeof(struct sadb_address)+sockaddr_size)/
3108 sizeof(uint64_t);
3109 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3110 addr->sadb_address_proto = 0;
3111 addr->sadb_address_reserved = 0;
3112 addr->sadb_address_prefixlen =
3113 pfkey_sockaddr_fill(&x->props.saddr, 0,
3114 (struct sockaddr *) (addr + 1),
3115 x->props.family);
3116 if (!addr->sadb_address_prefixlen)
3117 BUG();
3118
3119 /* dst address */
3120 addr = (struct sadb_address*) skb_put(skb,
3121 sizeof(struct sadb_address)+sockaddr_size);
3122 addr->sadb_address_len =
3123 (sizeof(struct sadb_address)+sockaddr_size)/
3124 sizeof(uint64_t);
3125 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3126 addr->sadb_address_proto = 0;
3127 addr->sadb_address_reserved = 0;
3128 addr->sadb_address_prefixlen =
3129 pfkey_sockaddr_fill(&x->id.daddr, 0,
3130 (struct sockaddr *) (addr + 1),
3131 x->props.family);
3132 if (!addr->sadb_address_prefixlen)
3133 BUG();
3134
3135 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3136 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3137 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3138 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3139 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3140 pol->sadb_x_policy_id = xp->index;
3141
3142 /* Set sadb_comb's. */
3143 if (x->id.proto == IPPROTO_AH)
3144 dump_ah_combs(skb, t);
3145 else if (x->id.proto == IPPROTO_ESP)
3146 dump_esp_combs(skb, t);
3147
3148 /* security context */
3149 if (xfrm_ctx) {
3150 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3151 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3152 sec_ctx->sadb_x_sec_len =
3153 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3154 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3155 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3156 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3157 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3158 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3159 xfrm_ctx->ctx_len);
3160 }
3161
3162 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3163 }
3164
3165 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3166 u8 *data, int len, int *dir)
3167 {
3168 struct net *net = sock_net(sk);
3169 struct xfrm_policy *xp;
3170 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3171 struct sadb_x_sec_ctx *sec_ctx;
3172
3173 switch (sk->sk_family) {
3174 case AF_INET:
3175 if (opt != IP_IPSEC_POLICY) {
3176 *dir = -EOPNOTSUPP;
3177 return NULL;
3178 }
3179 break;
3180 #if IS_ENABLED(CONFIG_IPV6)
3181 case AF_INET6:
3182 if (opt != IPV6_IPSEC_POLICY) {
3183 *dir = -EOPNOTSUPP;
3184 return NULL;
3185 }
3186 break;
3187 #endif
3188 default:
3189 *dir = -EINVAL;
3190 return NULL;
3191 }
3192
3193 *dir = -EINVAL;
3194
3195 if (len < sizeof(struct sadb_x_policy) ||
3196 pol->sadb_x_policy_len*8 > len ||
3197 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3198 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3199 return NULL;
3200
3201 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3202 if (xp == NULL) {
3203 *dir = -ENOBUFS;
3204 return NULL;
3205 }
3206
3207 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3208 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3209
3210 xp->lft.soft_byte_limit = XFRM_INF;
3211 xp->lft.hard_byte_limit = XFRM_INF;
3212 xp->lft.soft_packet_limit = XFRM_INF;
3213 xp->lft.hard_packet_limit = XFRM_INF;
3214 xp->family = sk->sk_family;
3215
3216 xp->xfrm_nr = 0;
3217 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3218 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3219 goto out;
3220
3221 /* security context too */
3222 if (len >= (pol->sadb_x_policy_len*8 +
3223 sizeof(struct sadb_x_sec_ctx))) {
3224 char *p = (char *)pol;
3225 struct xfrm_user_sec_ctx *uctx;
3226
3227 p += pol->sadb_x_policy_len*8;
3228 sec_ctx = (struct sadb_x_sec_ctx *)p;
3229 if (len < pol->sadb_x_policy_len*8 +
3230 sec_ctx->sadb_x_sec_len) {
3231 *dir = -EINVAL;
3232 goto out;
3233 }
3234 if ((*dir = verify_sec_ctx_len(p)))
3235 goto out;
3236 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3237 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3238 kfree(uctx);
3239
3240 if (*dir)
3241 goto out;
3242 }
3243
3244 *dir = pol->sadb_x_policy_dir-1;
3245 return xp;
3246
3247 out:
3248 xp->walk.dead = 1;
3249 xfrm_policy_destroy(xp);
3250 return NULL;
3251 }
3252
3253 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3254 {
3255 struct sk_buff *skb;
3256 struct sadb_msg *hdr;
3257 struct sadb_sa *sa;
3258 struct sadb_address *addr;
3259 struct sadb_x_nat_t_port *n_port;
3260 int sockaddr_size;
3261 int size;
3262 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3263 struct xfrm_encap_tmpl *natt = NULL;
3264
3265 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3266 if (!sockaddr_size)
3267 return -EINVAL;
3268
3269 if (!satype)
3270 return -EINVAL;
3271
3272 if (!x->encap)
3273 return -EINVAL;
3274
3275 natt = x->encap;
3276
3277 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3278 *
3279 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3280 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3281 */
3282
3283 size = sizeof(struct sadb_msg) +
3284 sizeof(struct sadb_sa) +
3285 (sizeof(struct sadb_address) * 2) +
3286 (sockaddr_size * 2) +
3287 (sizeof(struct sadb_x_nat_t_port) * 2);
3288
3289 skb = alloc_skb(size + 16, GFP_ATOMIC);
3290 if (skb == NULL)
3291 return -ENOMEM;
3292
3293 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3294 hdr->sadb_msg_version = PF_KEY_V2;
3295 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3296 hdr->sadb_msg_satype = satype;
3297 hdr->sadb_msg_len = size / sizeof(uint64_t);
3298 hdr->sadb_msg_errno = 0;
3299 hdr->sadb_msg_reserved = 0;
3300 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3301 hdr->sadb_msg_pid = 0;
3302
3303 /* SA */
3304 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3305 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3306 sa->sadb_sa_exttype = SADB_EXT_SA;
3307 sa->sadb_sa_spi = x->id.spi;
3308 sa->sadb_sa_replay = 0;
3309 sa->sadb_sa_state = 0;
3310 sa->sadb_sa_auth = 0;
3311 sa->sadb_sa_encrypt = 0;
3312 sa->sadb_sa_flags = 0;
3313
3314 /* ADDRESS_SRC (old addr) */
3315 addr = (struct sadb_address*)
3316 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3317 addr->sadb_address_len =
3318 (sizeof(struct sadb_address)+sockaddr_size)/
3319 sizeof(uint64_t);
3320 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3321 addr->sadb_address_proto = 0;
3322 addr->sadb_address_reserved = 0;
3323 addr->sadb_address_prefixlen =
3324 pfkey_sockaddr_fill(&x->props.saddr, 0,
3325 (struct sockaddr *) (addr + 1),
3326 x->props.family);
3327 if (!addr->sadb_address_prefixlen)
3328 BUG();
3329
3330 /* NAT_T_SPORT (old port) */
3331 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3332 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3333 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3334 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3335 n_port->sadb_x_nat_t_port_reserved = 0;
3336
3337 /* ADDRESS_DST (new addr) */
3338 addr = (struct sadb_address*)
3339 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3340 addr->sadb_address_len =
3341 (sizeof(struct sadb_address)+sockaddr_size)/
3342 sizeof(uint64_t);
3343 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3344 addr->sadb_address_proto = 0;
3345 addr->sadb_address_reserved = 0;
3346 addr->sadb_address_prefixlen =
3347 pfkey_sockaddr_fill(ipaddr, 0,
3348 (struct sockaddr *) (addr + 1),
3349 x->props.family);
3350 if (!addr->sadb_address_prefixlen)
3351 BUG();
3352
3353 /* NAT_T_DPORT (new port) */
3354 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3355 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3356 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3357 n_port->sadb_x_nat_t_port_port = sport;
3358 n_port->sadb_x_nat_t_port_reserved = 0;
3359
3360 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3361 }
3362
3363 #ifdef CONFIG_NET_KEY_MIGRATE
3364 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3365 const struct xfrm_selector *sel)
3366 {
3367 struct sadb_address *addr;
3368 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3369 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3370 addr->sadb_address_exttype = type;
3371 addr->sadb_address_proto = sel->proto;
3372 addr->sadb_address_reserved = 0;
3373
3374 switch (type) {
3375 case SADB_EXT_ADDRESS_SRC:
3376 addr->sadb_address_prefixlen = sel->prefixlen_s;
3377 pfkey_sockaddr_fill(&sel->saddr, 0,
3378 (struct sockaddr *)(addr + 1),
3379 sel->family);
3380 break;
3381 case SADB_EXT_ADDRESS_DST:
3382 addr->sadb_address_prefixlen = sel->prefixlen_d;
3383 pfkey_sockaddr_fill(&sel->daddr, 0,
3384 (struct sockaddr *)(addr + 1),
3385 sel->family);
3386 break;
3387 default:
3388 return -EINVAL;
3389 }
3390
3391 return 0;
3392 }
3393
3394
3395 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3396 {
3397 struct sadb_x_kmaddress *kma;
3398 u8 *sa;
3399 int family = k->family;
3400 int socklen = pfkey_sockaddr_len(family);
3401 int size_req;
3402
3403 size_req = (sizeof(struct sadb_x_kmaddress) +
3404 pfkey_sockaddr_pair_size(family));
3405
3406 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3407 memset(kma, 0, size_req);
3408 kma->sadb_x_kmaddress_len = size_req / 8;
3409 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3410 kma->sadb_x_kmaddress_reserved = k->reserved;
3411
3412 sa = (u8 *)(kma + 1);
3413 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3414 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3415 return -EINVAL;
3416
3417 return 0;
3418 }
3419
3420 static int set_ipsecrequest(struct sk_buff *skb,
3421 uint8_t proto, uint8_t mode, int level,
3422 uint32_t reqid, uint8_t family,
3423 const xfrm_address_t *src, const xfrm_address_t *dst)
3424 {
3425 struct sadb_x_ipsecrequest *rq;
3426 u8 *sa;
3427 int socklen = pfkey_sockaddr_len(family);
3428 int size_req;
3429
3430 size_req = sizeof(struct sadb_x_ipsecrequest) +
3431 pfkey_sockaddr_pair_size(family);
3432
3433 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3434 memset(rq, 0, size_req);
3435 rq->sadb_x_ipsecrequest_len = size_req;
3436 rq->sadb_x_ipsecrequest_proto = proto;
3437 rq->sadb_x_ipsecrequest_mode = mode;
3438 rq->sadb_x_ipsecrequest_level = level;
3439 rq->sadb_x_ipsecrequest_reqid = reqid;
3440
3441 sa = (u8 *) (rq + 1);
3442 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3443 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3444 return -EINVAL;
3445
3446 return 0;
3447 }
3448 #endif
3449
3450 #ifdef CONFIG_NET_KEY_MIGRATE
3451 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3452 const struct xfrm_migrate *m, int num_bundles,
3453 const struct xfrm_kmaddress *k)
3454 {
3455 int i;
3456 int sasize_sel;
3457 int size = 0;
3458 int size_pol = 0;
3459 struct sk_buff *skb;
3460 struct sadb_msg *hdr;
3461 struct sadb_x_policy *pol;
3462 const struct xfrm_migrate *mp;
3463
3464 if (type != XFRM_POLICY_TYPE_MAIN)
3465 return 0;
3466
3467 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3468 return -EINVAL;
3469
3470 if (k != NULL) {
3471 /* addresses for KM */
3472 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3473 pfkey_sockaddr_pair_size(k->family));
3474 }
3475
3476 /* selector */
3477 sasize_sel = pfkey_sockaddr_size(sel->family);
3478 if (!sasize_sel)
3479 return -EINVAL;
3480 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3481
3482 /* policy info */
3483 size_pol += sizeof(struct sadb_x_policy);
3484
3485 /* ipsecrequests */
3486 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3487 /* old locator pair */
3488 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3489 pfkey_sockaddr_pair_size(mp->old_family);
3490 /* new locator pair */
3491 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3492 pfkey_sockaddr_pair_size(mp->new_family);
3493 }
3494
3495 size += sizeof(struct sadb_msg) + size_pol;
3496
3497 /* alloc buffer */
3498 skb = alloc_skb(size, GFP_ATOMIC);
3499 if (skb == NULL)
3500 return -ENOMEM;
3501
3502 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3503 hdr->sadb_msg_version = PF_KEY_V2;
3504 hdr->sadb_msg_type = SADB_X_MIGRATE;
3505 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3506 hdr->sadb_msg_len = size / 8;
3507 hdr->sadb_msg_errno = 0;
3508 hdr->sadb_msg_reserved = 0;
3509 hdr->sadb_msg_seq = 0;
3510 hdr->sadb_msg_pid = 0;
3511
3512 /* Addresses to be used by KM for negotiation, if ext is available */
3513 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3514 goto err;
3515
3516 /* selector src */
3517 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3518
3519 /* selector dst */
3520 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3521
3522 /* policy information */
3523 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3524 pol->sadb_x_policy_len = size_pol / 8;
3525 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3526 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3527 pol->sadb_x_policy_dir = dir + 1;
3528 pol->sadb_x_policy_id = 0;
3529 pol->sadb_x_policy_priority = 0;
3530
3531 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3532 /* old ipsecrequest */
3533 int mode = pfkey_mode_from_xfrm(mp->mode);
3534 if (mode < 0)
3535 goto err;
3536 if (set_ipsecrequest(skb, mp->proto, mode,
3537 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3538 mp->reqid, mp->old_family,
3539 &mp->old_saddr, &mp->old_daddr) < 0)
3540 goto err;
3541
3542 /* new ipsecrequest */
3543 if (set_ipsecrequest(skb, mp->proto, mode,
3544 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3545 mp->reqid, mp->new_family,
3546 &mp->new_saddr, &mp->new_daddr) < 0)
3547 goto err;
3548 }
3549
3550 /* broadcast migrate message to sockets */
3551 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3552
3553 return 0;
3554
3555 err:
3556 kfree_skb(skb);
3557 return -EINVAL;
3558 }
3559 #else
3560 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3561 const struct xfrm_migrate *m, int num_bundles,
3562 const struct xfrm_kmaddress *k)
3563 {
3564 return -ENOPROTOOPT;
3565 }
3566 #endif
3567
3568 static int pfkey_sendmsg(struct kiocb *kiocb,
3569 struct socket *sock, struct msghdr *msg, size_t len)
3570 {
3571 struct sock *sk = sock->sk;
3572 struct sk_buff *skb = NULL;
3573 struct sadb_msg *hdr = NULL;
3574 int err;
3575
3576 err = -EOPNOTSUPP;
3577 if (msg->msg_flags & MSG_OOB)
3578 goto out;
3579
3580 err = -EMSGSIZE;
3581 if ((unsigned int)len > sk->sk_sndbuf - 32)
3582 goto out;
3583
3584 err = -ENOBUFS;
3585 skb = alloc_skb(len, GFP_KERNEL);
3586 if (skb == NULL)
3587 goto out;
3588
3589 err = -EFAULT;
3590 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3591 goto out;
3592
3593 hdr = pfkey_get_base_msg(skb, &err);
3594 if (!hdr)
3595 goto out;
3596
3597 mutex_lock(&xfrm_cfg_mutex);
3598 err = pfkey_process(sk, skb, hdr);
3599 mutex_unlock(&xfrm_cfg_mutex);
3600
3601 out:
3602 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3603 err = 0;
3604 kfree_skb(skb);
3605
3606 return err ? : len;
3607 }
3608
3609 static int pfkey_recvmsg(struct kiocb *kiocb,
3610 struct socket *sock, struct msghdr *msg, size_t len,
3611 int flags)
3612 {
3613 struct sock *sk = sock->sk;
3614 struct pfkey_sock *pfk = pfkey_sk(sk);
3615 struct sk_buff *skb;
3616 int copied, err;
3617
3618 err = -EINVAL;
3619 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3620 goto out;
3621
3622 msg->msg_namelen = 0;
3623 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3624 if (skb == NULL)
3625 goto out;
3626
3627 copied = skb->len;
3628 if (copied > len) {
3629 msg->msg_flags |= MSG_TRUNC;
3630 copied = len;
3631 }
3632
3633 skb_reset_transport_header(skb);
3634 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3635 if (err)
3636 goto out_free;
3637
3638 sock_recv_ts_and_drops(msg, sk, skb);
3639
3640 err = (flags & MSG_TRUNC) ? skb->len : copied;
3641
3642 if (pfk->dump.dump != NULL &&
3643 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3644 pfkey_do_dump(pfk);
3645
3646 out_free:
3647 skb_free_datagram(sk, skb);
3648 out:
3649 return err;
3650 }
3651
3652 static const struct proto_ops pfkey_ops = {
3653 .family = PF_KEY,
3654 .owner = THIS_MODULE,
3655 /* Operations that make no sense on pfkey sockets. */
3656 .bind = sock_no_bind,
3657 .connect = sock_no_connect,
3658 .socketpair = sock_no_socketpair,
3659 .accept = sock_no_accept,
3660 .getname = sock_no_getname,
3661 .ioctl = sock_no_ioctl,
3662 .listen = sock_no_listen,
3663 .shutdown = sock_no_shutdown,
3664 .setsockopt = sock_no_setsockopt,
3665 .getsockopt = sock_no_getsockopt,
3666 .mmap = sock_no_mmap,
3667 .sendpage = sock_no_sendpage,
3668
3669 /* Now the operations that really occur. */
3670 .release = pfkey_release,
3671 .poll = datagram_poll,
3672 .sendmsg = pfkey_sendmsg,
3673 .recvmsg = pfkey_recvmsg,
3674 };
3675
3676 static const struct net_proto_family pfkey_family_ops = {
3677 .family = PF_KEY,
3678 .create = pfkey_create,
3679 .owner = THIS_MODULE,
3680 };
3681
3682 #ifdef CONFIG_PROC_FS
3683 static int pfkey_seq_show(struct seq_file *f, void *v)
3684 {
3685 struct sock *s = sk_entry(v);
3686
3687 if (v == SEQ_START_TOKEN)
3688 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3689 else
3690 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3691 s,
3692 atomic_read(&s->sk_refcnt),
3693 sk_rmem_alloc_get(s),
3694 sk_wmem_alloc_get(s),
3695 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3696 sock_i_ino(s)
3697 );
3698 return 0;
3699 }
3700
3701 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3702 __acquires(rcu)
3703 {
3704 struct net *net = seq_file_net(f);
3705 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3706
3707 rcu_read_lock();
3708 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3709 }
3710
3711 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3712 {
3713 struct net *net = seq_file_net(f);
3714 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3715
3716 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3717 }
3718
3719 static void pfkey_seq_stop(struct seq_file *f, void *v)
3720 __releases(rcu)
3721 {
3722 rcu_read_unlock();
3723 }
3724
3725 static const struct seq_operations pfkey_seq_ops = {
3726 .start = pfkey_seq_start,
3727 .next = pfkey_seq_next,
3728 .stop = pfkey_seq_stop,
3729 .show = pfkey_seq_show,
3730 };
3731
3732 static int pfkey_seq_open(struct inode *inode, struct file *file)
3733 {
3734 return seq_open_net(inode, file, &pfkey_seq_ops,
3735 sizeof(struct seq_net_private));
3736 }
3737
3738 static const struct file_operations pfkey_proc_ops = {
3739 .open = pfkey_seq_open,
3740 .read = seq_read,
3741 .llseek = seq_lseek,
3742 .release = seq_release_net,
3743 };
3744
3745 static int __net_init pfkey_init_proc(struct net *net)
3746 {
3747 struct proc_dir_entry *e;
3748
3749 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3750 if (e == NULL)
3751 return -ENOMEM;
3752
3753 return 0;
3754 }
3755
3756 static void __net_exit pfkey_exit_proc(struct net *net)
3757 {
3758 remove_proc_entry("pfkey", net->proc_net);
3759 }
3760 #else
3761 static inline int pfkey_init_proc(struct net *net)
3762 {
3763 return 0;
3764 }
3765
3766 static inline void pfkey_exit_proc(struct net *net)
3767 {
3768 }
3769 #endif
3770
3771 static struct xfrm_mgr pfkeyv2_mgr =
3772 {
3773 .id = "pfkeyv2",
3774 .notify = pfkey_send_notify,
3775 .acquire = pfkey_send_acquire,
3776 .compile_policy = pfkey_compile_policy,
3777 .new_mapping = pfkey_send_new_mapping,
3778 .notify_policy = pfkey_send_policy_notify,
3779 .migrate = pfkey_send_migrate,
3780 };
3781
3782 static int __net_init pfkey_net_init(struct net *net)
3783 {
3784 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3785 int rv;
3786
3787 INIT_HLIST_HEAD(&net_pfkey->table);
3788 atomic_set(&net_pfkey->socks_nr, 0);
3789
3790 rv = pfkey_init_proc(net);
3791
3792 return rv;
3793 }
3794
3795 static void __net_exit pfkey_net_exit(struct net *net)
3796 {
3797 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3798
3799 pfkey_exit_proc(net);
3800 BUG_ON(!hlist_empty(&net_pfkey->table));
3801 }
3802
3803 static struct pernet_operations pfkey_net_ops = {
3804 .init = pfkey_net_init,
3805 .exit = pfkey_net_exit,
3806 .id = &pfkey_net_id,
3807 .size = sizeof(struct netns_pfkey),
3808 };
3809
3810 static void __exit ipsec_pfkey_exit(void)
3811 {
3812 xfrm_unregister_km(&pfkeyv2_mgr);
3813 sock_unregister(PF_KEY);
3814 unregister_pernet_subsys(&pfkey_net_ops);
3815 proto_unregister(&key_proto);
3816 }
3817
3818 static int __init ipsec_pfkey_init(void)
3819 {
3820 int err = proto_register(&key_proto, 0);
3821
3822 if (err != 0)
3823 goto out;
3824
3825 err = register_pernet_subsys(&pfkey_net_ops);
3826 if (err != 0)
3827 goto out_unregister_key_proto;
3828 err = sock_register(&pfkey_family_ops);
3829 if (err != 0)
3830 goto out_unregister_pernet;
3831 err = xfrm_register_km(&pfkeyv2_mgr);
3832 if (err != 0)
3833 goto out_sock_unregister;
3834 out:
3835 return err;
3836
3837 out_sock_unregister:
3838 sock_unregister(PF_KEY);
3839 out_unregister_pernet:
3840 unregister_pernet_subsys(&pfkey_net_ops);
3841 out_unregister_key_proto:
3842 proto_unregister(&key_proto);
3843 goto out;
3844 }
3845
3846 module_init(ipsec_pfkey_init);
3847 module_exit(ipsec_pfkey_exit);
3848 MODULE_LICENSE("GPL");
3849 MODULE_ALIAS_NETPROTO(PF_KEY);
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