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xfrm: Remove ancient sleeping when the SA is in acquire state
[mirror_ubuntu-artful-kernel.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*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 const u8 sadb_ext_min_len[] = {
342 [SADB_EXT_RESERVED] = (u8) 0,
343 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
344 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
345 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
348 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
351 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
353 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
355 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
356 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
357 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
359 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
360 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
361 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
362 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
363 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
364 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
366 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
367 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
368 };
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 = min_t(unsigned int, sa->sadb_sa_replay,
1102 (sizeof(x->replay.bitmap) * 8));
1103 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1104 x->props.flags |= XFRM_STATE_NOECN;
1105 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1106 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1107 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1108 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1109
1110 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1111 if (lifetime != NULL) {
1112 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1113 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1114 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1115 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1116 }
1117 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1118 if (lifetime != NULL) {
1119 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1120 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1121 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1122 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1123 }
1124
1125 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126 if (sec_ctx != NULL) {
1127 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1128
1129 if (!uctx)
1130 goto out;
1131
1132 err = security_xfrm_state_alloc(x, uctx);
1133 kfree(uctx);
1134
1135 if (err)
1136 goto out;
1137 }
1138
1139 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1140 if (sa->sadb_sa_auth) {
1141 int keysize = 0;
1142 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143 if (!a || !a->pfkey_supported) {
1144 err = -ENOSYS;
1145 goto out;
1146 }
1147 if (key)
1148 keysize = (key->sadb_key_bits + 7) / 8;
1149 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1150 if (!x->aalg)
1151 goto out;
1152 strcpy(x->aalg->alg_name, a->name);
1153 x->aalg->alg_key_len = 0;
1154 if (key) {
1155 x->aalg->alg_key_len = key->sadb_key_bits;
1156 memcpy(x->aalg->alg_key, key+1, keysize);
1157 }
1158 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1159 x->props.aalgo = sa->sadb_sa_auth;
1160 /* x->algo.flags = sa->sadb_sa_flags; */
1161 }
1162 if (sa->sadb_sa_encrypt) {
1163 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1164 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1165 if (!a || !a->pfkey_supported) {
1166 err = -ENOSYS;
1167 goto out;
1168 }
1169 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1170 if (!x->calg)
1171 goto out;
1172 strcpy(x->calg->alg_name, a->name);
1173 x->props.calgo = sa->sadb_sa_encrypt;
1174 } else {
1175 int keysize = 0;
1176 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1177 if (!a || !a->pfkey_supported) {
1178 err = -ENOSYS;
1179 goto out;
1180 }
1181 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1182 if (key)
1183 keysize = (key->sadb_key_bits + 7) / 8;
1184 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1185 if (!x->ealg)
1186 goto out;
1187 strcpy(x->ealg->alg_name, a->name);
1188 x->ealg->alg_key_len = 0;
1189 if (key) {
1190 x->ealg->alg_key_len = key->sadb_key_bits;
1191 memcpy(x->ealg->alg_key, key+1, keysize);
1192 }
1193 x->props.ealgo = sa->sadb_sa_encrypt;
1194 }
1195 }
1196 /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199 &x->props.saddr);
1200 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201 &x->id.daddr);
1202
1203 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206 if (mode < 0) {
1207 err = -EINVAL;
1208 goto out;
1209 }
1210 x->props.mode = mode;
1211 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212 }
1213
1214 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217 /* Nobody uses this, but we try. */
1218 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220 }
1221
1222 if (!x->sel.family)
1223 x->sel.family = x->props.family;
1224
1225 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226 const struct sadb_x_nat_t_type* n_type;
1227 struct xfrm_encap_tmpl *natt;
1228
1229 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230 if (!x->encap)
1231 goto out;
1232
1233 natt = x->encap;
1234 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238 const struct sadb_x_nat_t_port *n_port =
1239 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241 }
1242 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243 const struct sadb_x_nat_t_port *n_port =
1244 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246 }
1247 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248 }
1249
1250 err = xfrm_init_state(x);
1251 if (err)
1252 goto out;
1253
1254 x->km.seq = hdr->sadb_msg_seq;
1255 return x;
1256
1257 out:
1258 x->km.state = XFRM_STATE_DEAD;
1259 xfrm_state_put(x);
1260 return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265 return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270 struct net *net = sock_net(sk);
1271 struct sk_buff *resp_skb;
1272 struct sadb_x_sa2 *sa2;
1273 struct sadb_address *saddr, *daddr;
1274 struct sadb_msg *out_hdr;
1275 struct sadb_spirange *range;
1276 struct xfrm_state *x = NULL;
1277 int mode;
1278 int err;
1279 u32 min_spi, max_spi;
1280 u32 reqid;
1281 u8 proto;
1282 unsigned short family;
1283 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287 return -EINVAL;
1288
1289 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290 if (proto == 0)
1291 return -EINVAL;
1292
1293 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295 if (mode < 0)
1296 return -EINVAL;
1297 reqid = sa2->sadb_x_sa2_reqid;
1298 } else {
1299 mode = 0;
1300 reqid = 0;
1301 }
1302
1303 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307 switch (family) {
1308 case AF_INET:
1309 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313 case AF_INET6:
1314 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316 break;
1317 #endif
1318 }
1319
1320 if (hdr->sadb_msg_seq) {
1321 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323 xfrm_state_put(x);
1324 x = NULL;
1325 }
1326 }
1327
1328 if (!x)
1329 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331 if (x == NULL)
1332 return -ENOENT;
1333
1334 min_spi = 0x100;
1335 max_spi = 0x0fffffff;
1336
1337 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338 if (range) {
1339 min_spi = range->sadb_spirange_min;
1340 max_spi = range->sadb_spirange_max;
1341 }
1342
1343 err = xfrm_alloc_spi(x, min_spi, max_spi);
1344 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1345
1346 if (IS_ERR(resp_skb)) {
1347 xfrm_state_put(x);
1348 return PTR_ERR(resp_skb);
1349 }
1350
1351 out_hdr = (struct sadb_msg *) resp_skb->data;
1352 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1353 out_hdr->sadb_msg_type = SADB_GETSPI;
1354 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1355 out_hdr->sadb_msg_errno = 0;
1356 out_hdr->sadb_msg_reserved = 0;
1357 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1358 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1359
1360 xfrm_state_put(x);
1361
1362 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1363
1364 return 0;
1365 }
1366
1367 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1368 {
1369 struct net *net = sock_net(sk);
1370 struct xfrm_state *x;
1371
1372 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1373 return -EOPNOTSUPP;
1374
1375 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1376 return 0;
1377
1378 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379 if (x == NULL)
1380 return 0;
1381
1382 spin_lock_bh(&x->lock);
1383 if (x->km.state == XFRM_STATE_ACQ)
1384 x->km.state = XFRM_STATE_ERROR;
1385
1386 spin_unlock_bh(&x->lock);
1387 xfrm_state_put(x);
1388 return 0;
1389 }
1390
1391 static inline int event2poltype(int event)
1392 {
1393 switch (event) {
1394 case XFRM_MSG_DELPOLICY:
1395 return SADB_X_SPDDELETE;
1396 case XFRM_MSG_NEWPOLICY:
1397 return SADB_X_SPDADD;
1398 case XFRM_MSG_UPDPOLICY:
1399 return SADB_X_SPDUPDATE;
1400 case XFRM_MSG_POLEXPIRE:
1401 // return SADB_X_SPDEXPIRE;
1402 default:
1403 pr_err("pfkey: Unknown policy event %d\n", event);
1404 break;
1405 }
1406
1407 return 0;
1408 }
1409
1410 static inline int event2keytype(int event)
1411 {
1412 switch (event) {
1413 case XFRM_MSG_DELSA:
1414 return SADB_DELETE;
1415 case XFRM_MSG_NEWSA:
1416 return SADB_ADD;
1417 case XFRM_MSG_UPDSA:
1418 return SADB_UPDATE;
1419 case XFRM_MSG_EXPIRE:
1420 return SADB_EXPIRE;
1421 default:
1422 pr_err("pfkey: Unknown SA event %d\n", event);
1423 break;
1424 }
1425
1426 return 0;
1427 }
1428
1429 /* ADD/UPD/DEL */
1430 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1431 {
1432 struct sk_buff *skb;
1433 struct sadb_msg *hdr;
1434
1435 skb = pfkey_xfrm_state2msg(x);
1436
1437 if (IS_ERR(skb))
1438 return PTR_ERR(skb);
1439
1440 hdr = (struct sadb_msg *) skb->data;
1441 hdr->sadb_msg_version = PF_KEY_V2;
1442 hdr->sadb_msg_type = event2keytype(c->event);
1443 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1444 hdr->sadb_msg_errno = 0;
1445 hdr->sadb_msg_reserved = 0;
1446 hdr->sadb_msg_seq = c->seq;
1447 hdr->sadb_msg_pid = c->portid;
1448
1449 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1450
1451 return 0;
1452 }
1453
1454 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1455 {
1456 struct net *net = sock_net(sk);
1457 struct xfrm_state *x;
1458 int err;
1459 struct km_event c;
1460
1461 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1462 if (IS_ERR(x))
1463 return PTR_ERR(x);
1464
1465 xfrm_state_hold(x);
1466 if (hdr->sadb_msg_type == SADB_ADD)
1467 err = xfrm_state_add(x);
1468 else
1469 err = xfrm_state_update(x);
1470
1471 xfrm_audit_state_add(x, err ? 0 : 1,
1472 audit_get_loginuid(current),
1473 audit_get_sessionid(current), 0);
1474
1475 if (err < 0) {
1476 x->km.state = XFRM_STATE_DEAD;
1477 __xfrm_state_put(x);
1478 goto out;
1479 }
1480
1481 if (hdr->sadb_msg_type == SADB_ADD)
1482 c.event = XFRM_MSG_NEWSA;
1483 else
1484 c.event = XFRM_MSG_UPDSA;
1485 c.seq = hdr->sadb_msg_seq;
1486 c.portid = hdr->sadb_msg_pid;
1487 km_state_notify(x, &c);
1488 out:
1489 xfrm_state_put(x);
1490 return err;
1491 }
1492
1493 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1494 {
1495 struct net *net = sock_net(sk);
1496 struct xfrm_state *x;
1497 struct km_event c;
1498 int err;
1499
1500 if (!ext_hdrs[SADB_EXT_SA-1] ||
1501 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1502 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1503 return -EINVAL;
1504
1505 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1506 if (x == NULL)
1507 return -ESRCH;
1508
1509 if ((err = security_xfrm_state_delete(x)))
1510 goto out;
1511
1512 if (xfrm_state_kern(x)) {
1513 err = -EPERM;
1514 goto out;
1515 }
1516
1517 err = xfrm_state_delete(x);
1518
1519 if (err < 0)
1520 goto out;
1521
1522 c.seq = hdr->sadb_msg_seq;
1523 c.portid = hdr->sadb_msg_pid;
1524 c.event = XFRM_MSG_DELSA;
1525 km_state_notify(x, &c);
1526 out:
1527 xfrm_audit_state_delete(x, err ? 0 : 1,
1528 audit_get_loginuid(current),
1529 audit_get_sessionid(current), 0);
1530 xfrm_state_put(x);
1531
1532 return err;
1533 }
1534
1535 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1536 {
1537 struct net *net = sock_net(sk);
1538 __u8 proto;
1539 struct sk_buff *out_skb;
1540 struct sadb_msg *out_hdr;
1541 struct xfrm_state *x;
1542
1543 if (!ext_hdrs[SADB_EXT_SA-1] ||
1544 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1545 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1546 return -EINVAL;
1547
1548 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1549 if (x == NULL)
1550 return -ESRCH;
1551
1552 out_skb = pfkey_xfrm_state2msg(x);
1553 proto = x->id.proto;
1554 xfrm_state_put(x);
1555 if (IS_ERR(out_skb))
1556 return PTR_ERR(out_skb);
1557
1558 out_hdr = (struct sadb_msg *) out_skb->data;
1559 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1560 out_hdr->sadb_msg_type = SADB_GET;
1561 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1562 out_hdr->sadb_msg_errno = 0;
1563 out_hdr->sadb_msg_reserved = 0;
1564 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1565 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1566 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1567
1568 return 0;
1569 }
1570
1571 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1572 gfp_t allocation)
1573 {
1574 struct sk_buff *skb;
1575 struct sadb_msg *hdr;
1576 int len, auth_len, enc_len, i;
1577
1578 auth_len = xfrm_count_pfkey_auth_supported();
1579 if (auth_len) {
1580 auth_len *= sizeof(struct sadb_alg);
1581 auth_len += sizeof(struct sadb_supported);
1582 }
1583
1584 enc_len = xfrm_count_pfkey_enc_supported();
1585 if (enc_len) {
1586 enc_len *= sizeof(struct sadb_alg);
1587 enc_len += sizeof(struct sadb_supported);
1588 }
1589
1590 len = enc_len + auth_len + sizeof(struct sadb_msg);
1591
1592 skb = alloc_skb(len + 16, allocation);
1593 if (!skb)
1594 goto out_put_algs;
1595
1596 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1597 pfkey_hdr_dup(hdr, orig);
1598 hdr->sadb_msg_errno = 0;
1599 hdr->sadb_msg_len = len / sizeof(uint64_t);
1600
1601 if (auth_len) {
1602 struct sadb_supported *sp;
1603 struct sadb_alg *ap;
1604
1605 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1606 ap = (struct sadb_alg *) (sp + 1);
1607
1608 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1609 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1610
1611 for (i = 0; ; i++) {
1612 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1613 if (!aalg)
1614 break;
1615 if (!aalg->pfkey_supported)
1616 continue;
1617 if (aalg->available)
1618 *ap++ = aalg->desc;
1619 }
1620 }
1621
1622 if (enc_len) {
1623 struct sadb_supported *sp;
1624 struct sadb_alg *ap;
1625
1626 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1627 ap = (struct sadb_alg *) (sp + 1);
1628
1629 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1630 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1631
1632 for (i = 0; ; i++) {
1633 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1634 if (!ealg)
1635 break;
1636 if (!ealg->pfkey_supported)
1637 continue;
1638 if (ealg->available)
1639 *ap++ = ealg->desc;
1640 }
1641 }
1642
1643 out_put_algs:
1644 return skb;
1645 }
1646
1647 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1648 {
1649 struct pfkey_sock *pfk = pfkey_sk(sk);
1650 struct sk_buff *supp_skb;
1651
1652 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1653 return -EINVAL;
1654
1655 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1656 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1657 return -EEXIST;
1658 pfk->registered |= (1<<hdr->sadb_msg_satype);
1659 }
1660
1661 xfrm_probe_algs();
1662
1663 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1664 if (!supp_skb) {
1665 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1666 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1667
1668 return -ENOBUFS;
1669 }
1670
1671 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1672
1673 return 0;
1674 }
1675
1676 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1677 {
1678 struct sk_buff *skb;
1679 struct sadb_msg *hdr;
1680
1681 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1682 if (!skb)
1683 return -ENOBUFS;
1684
1685 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1686 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1687 hdr->sadb_msg_errno = (uint8_t) 0;
1688 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1689
1690 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1691 }
1692
1693 static int key_notify_sa_flush(const struct km_event *c)
1694 {
1695 struct sk_buff *skb;
1696 struct sadb_msg *hdr;
1697
1698 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1699 if (!skb)
1700 return -ENOBUFS;
1701 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1702 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1703 hdr->sadb_msg_type = SADB_FLUSH;
1704 hdr->sadb_msg_seq = c->seq;
1705 hdr->sadb_msg_pid = c->portid;
1706 hdr->sadb_msg_version = PF_KEY_V2;
1707 hdr->sadb_msg_errno = (uint8_t) 0;
1708 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1709 hdr->sadb_msg_reserved = 0;
1710
1711 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1712
1713 return 0;
1714 }
1715
1716 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1717 {
1718 struct net *net = sock_net(sk);
1719 unsigned int proto;
1720 struct km_event c;
1721 struct xfrm_audit audit_info;
1722 int err, err2;
1723
1724 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1725 if (proto == 0)
1726 return -EINVAL;
1727
1728 audit_info.loginuid = audit_get_loginuid(current);
1729 audit_info.sessionid = audit_get_sessionid(current);
1730 audit_info.secid = 0;
1731 err = xfrm_state_flush(net, proto, &audit_info);
1732 err2 = unicast_flush_resp(sk, hdr);
1733 if (err || err2) {
1734 if (err == -ESRCH) /* empty table - go quietly */
1735 err = 0;
1736 return err ? err : err2;
1737 }
1738
1739 c.data.proto = proto;
1740 c.seq = hdr->sadb_msg_seq;
1741 c.portid = hdr->sadb_msg_pid;
1742 c.event = XFRM_MSG_FLUSHSA;
1743 c.net = net;
1744 km_state_notify(NULL, &c);
1745
1746 return 0;
1747 }
1748
1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1750 {
1751 struct pfkey_sock *pfk = ptr;
1752 struct sk_buff *out_skb;
1753 struct sadb_msg *out_hdr;
1754
1755 if (!pfkey_can_dump(&pfk->sk))
1756 return -ENOBUFS;
1757
1758 out_skb = pfkey_xfrm_state2msg(x);
1759 if (IS_ERR(out_skb))
1760 return PTR_ERR(out_skb);
1761
1762 out_hdr = (struct sadb_msg *) out_skb->data;
1763 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1764 out_hdr->sadb_msg_type = SADB_DUMP;
1765 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1766 out_hdr->sadb_msg_errno = 0;
1767 out_hdr->sadb_msg_reserved = 0;
1768 out_hdr->sadb_msg_seq = count + 1;
1769 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1770
1771 if (pfk->dump.skb)
1772 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1773 &pfk->sk, sock_net(&pfk->sk));
1774 pfk->dump.skb = out_skb;
1775
1776 return 0;
1777 }
1778
1779 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1780 {
1781 struct net *net = sock_net(&pfk->sk);
1782 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 }
1784
1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1786 {
1787 struct net *net = sock_net(&pfk->sk);
1788
1789 xfrm_state_walk_done(&pfk->dump.u.state, net);
1790 }
1791
1792 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1793 {
1794 u8 proto;
1795 struct pfkey_sock *pfk = pfkey_sk(sk);
1796
1797 if (pfk->dump.dump != NULL)
1798 return -EBUSY;
1799
1800 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1801 if (proto == 0)
1802 return -EINVAL;
1803
1804 pfk->dump.msg_version = hdr->sadb_msg_version;
1805 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1806 pfk->dump.dump = pfkey_dump_sa;
1807 pfk->dump.done = pfkey_dump_sa_done;
1808 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1809
1810 return pfkey_do_dump(pfk);
1811 }
1812
1813 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1814 {
1815 struct pfkey_sock *pfk = pfkey_sk(sk);
1816 int satype = hdr->sadb_msg_satype;
1817 bool reset_errno = false;
1818
1819 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1820 reset_errno = true;
1821 if (satype != 0 && satype != 1)
1822 return -EINVAL;
1823 pfk->promisc = satype;
1824 }
1825 if (reset_errno && skb_cloned(skb))
1826 skb = skb_copy(skb, GFP_KERNEL);
1827 else
1828 skb = skb_clone(skb, GFP_KERNEL);
1829
1830 if (reset_errno && skb) {
1831 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1832 new_hdr->sadb_msg_errno = 0;
1833 }
1834
1835 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1836 return 0;
1837 }
1838
1839 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1840 {
1841 int i;
1842 u32 reqid = *(u32*)ptr;
1843
1844 for (i=0; i<xp->xfrm_nr; i++) {
1845 if (xp->xfrm_vec[i].reqid == reqid)
1846 return -EEXIST;
1847 }
1848 return 0;
1849 }
1850
1851 static u32 gen_reqid(struct net *net)
1852 {
1853 struct xfrm_policy_walk walk;
1854 u32 start;
1855 int rc;
1856 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1857
1858 start = reqid;
1859 do {
1860 ++reqid;
1861 if (reqid == 0)
1862 reqid = IPSEC_MANUAL_REQID_MAX+1;
1863 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1864 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1865 xfrm_policy_walk_done(&walk, net);
1866 if (rc != -EEXIST)
1867 return reqid;
1868 } while (reqid != start);
1869 return 0;
1870 }
1871
1872 static int
1873 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1874 {
1875 struct net *net = xp_net(xp);
1876 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1877 int mode;
1878
1879 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1880 return -ELOOP;
1881
1882 if (rq->sadb_x_ipsecrequest_mode == 0)
1883 return -EINVAL;
1884
1885 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1886 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1887 return -EINVAL;
1888 t->mode = mode;
1889 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1890 t->optional = 1;
1891 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1892 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1893 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1894 t->reqid = 0;
1895 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1896 return -ENOBUFS;
1897 }
1898
1899 /* addresses present only in tunnel mode */
1900 if (t->mode == XFRM_MODE_TUNNEL) {
1901 u8 *sa = (u8 *) (rq + 1);
1902 int family, socklen;
1903
1904 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1905 &t->saddr);
1906 if (!family)
1907 return -EINVAL;
1908
1909 socklen = pfkey_sockaddr_len(family);
1910 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1911 &t->id.daddr) != family)
1912 return -EINVAL;
1913 t->encap_family = family;
1914 } else
1915 t->encap_family = xp->family;
1916
1917 /* No way to set this via kame pfkey */
1918 t->allalgs = 1;
1919 xp->xfrm_nr++;
1920 return 0;
1921 }
1922
1923 static int
1924 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1925 {
1926 int err;
1927 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1928 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1929
1930 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1931 return -EINVAL;
1932
1933 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1934 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1935 return err;
1936 len -= rq->sadb_x_ipsecrequest_len;
1937 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1938 }
1939 return 0;
1940 }
1941
1942 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1943 {
1944 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1945
1946 if (xfrm_ctx) {
1947 int len = sizeof(struct sadb_x_sec_ctx);
1948 len += xfrm_ctx->ctx_len;
1949 return PFKEY_ALIGN8(len);
1950 }
1951 return 0;
1952 }
1953
1954 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1955 {
1956 const struct xfrm_tmpl *t;
1957 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1958 int socklen = 0;
1959 int i;
1960
1961 for (i=0; i<xp->xfrm_nr; i++) {
1962 t = xp->xfrm_vec + i;
1963 socklen += pfkey_sockaddr_len(t->encap_family);
1964 }
1965
1966 return sizeof(struct sadb_msg) +
1967 (sizeof(struct sadb_lifetime) * 3) +
1968 (sizeof(struct sadb_address) * 2) +
1969 (sockaddr_size * 2) +
1970 sizeof(struct sadb_x_policy) +
1971 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1972 (socklen * 2) +
1973 pfkey_xfrm_policy2sec_ctx_size(xp);
1974 }
1975
1976 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1977 {
1978 struct sk_buff *skb;
1979 int size;
1980
1981 size = pfkey_xfrm_policy2msg_size(xp);
1982
1983 skb = alloc_skb(size + 16, GFP_ATOMIC);
1984 if (skb == NULL)
1985 return ERR_PTR(-ENOBUFS);
1986
1987 return skb;
1988 }
1989
1990 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1991 {
1992 struct sadb_msg *hdr;
1993 struct sadb_address *addr;
1994 struct sadb_lifetime *lifetime;
1995 struct sadb_x_policy *pol;
1996 struct sadb_x_sec_ctx *sec_ctx;
1997 struct xfrm_sec_ctx *xfrm_ctx;
1998 int i;
1999 int size;
2000 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2001 int socklen = pfkey_sockaddr_len(xp->family);
2002
2003 size = pfkey_xfrm_policy2msg_size(xp);
2004
2005 /* call should fill header later */
2006 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2007 memset(hdr, 0, size); /* XXX do we need this ? */
2008
2009 /* src address */
2010 addr = (struct sadb_address*) skb_put(skb,
2011 sizeof(struct sadb_address)+sockaddr_size);
2012 addr->sadb_address_len =
2013 (sizeof(struct sadb_address)+sockaddr_size)/
2014 sizeof(uint64_t);
2015 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2016 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2017 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2018 addr->sadb_address_reserved = 0;
2019 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2020 xp->selector.sport,
2021 (struct sockaddr *) (addr + 1),
2022 xp->family))
2023 BUG();
2024
2025 /* dst address */
2026 addr = (struct sadb_address*) skb_put(skb,
2027 sizeof(struct sadb_address)+sockaddr_size);
2028 addr->sadb_address_len =
2029 (sizeof(struct sadb_address)+sockaddr_size)/
2030 sizeof(uint64_t);
2031 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2032 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2033 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2034 addr->sadb_address_reserved = 0;
2035
2036 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2037 (struct sockaddr *) (addr + 1),
2038 xp->family);
2039
2040 /* hard time */
2041 lifetime = (struct sadb_lifetime *) skb_put(skb,
2042 sizeof(struct sadb_lifetime));
2043 lifetime->sadb_lifetime_len =
2044 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2045 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2046 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2047 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2048 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2049 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2050 /* soft time */
2051 lifetime = (struct sadb_lifetime *) skb_put(skb,
2052 sizeof(struct sadb_lifetime));
2053 lifetime->sadb_lifetime_len =
2054 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2055 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2056 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2057 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2058 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2059 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2060 /* current time */
2061 lifetime = (struct sadb_lifetime *) skb_put(skb,
2062 sizeof(struct sadb_lifetime));
2063 lifetime->sadb_lifetime_len =
2064 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2065 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2066 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2067 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2068 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2069 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2070
2071 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2072 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2073 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2074 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2075 if (xp->action == XFRM_POLICY_ALLOW) {
2076 if (xp->xfrm_nr)
2077 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2078 else
2079 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2080 }
2081 pol->sadb_x_policy_dir = dir+1;
2082 pol->sadb_x_policy_reserved = 0;
2083 pol->sadb_x_policy_id = xp->index;
2084 pol->sadb_x_policy_priority = xp->priority;
2085
2086 for (i=0; i<xp->xfrm_nr; i++) {
2087 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2088 struct sadb_x_ipsecrequest *rq;
2089 int req_size;
2090 int mode;
2091
2092 req_size = sizeof(struct sadb_x_ipsecrequest);
2093 if (t->mode == XFRM_MODE_TUNNEL) {
2094 socklen = pfkey_sockaddr_len(t->encap_family);
2095 req_size += socklen * 2;
2096 } else {
2097 size -= 2*socklen;
2098 }
2099 rq = (void*)skb_put(skb, req_size);
2100 pol->sadb_x_policy_len += req_size/8;
2101 memset(rq, 0, sizeof(*rq));
2102 rq->sadb_x_ipsecrequest_len = req_size;
2103 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2104 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2105 return -EINVAL;
2106 rq->sadb_x_ipsecrequest_mode = mode;
2107 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2108 if (t->reqid)
2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2110 if (t->optional)
2111 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2112 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2113
2114 if (t->mode == XFRM_MODE_TUNNEL) {
2115 u8 *sa = (void *)(rq + 1);
2116 pfkey_sockaddr_fill(&t->saddr, 0,
2117 (struct sockaddr *)sa,
2118 t->encap_family);
2119 pfkey_sockaddr_fill(&t->id.daddr, 0,
2120 (struct sockaddr *) (sa + socklen),
2121 t->encap_family);
2122 }
2123 }
2124
2125 /* security context */
2126 if ((xfrm_ctx = xp->security)) {
2127 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2128
2129 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2130 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2131 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2132 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2133 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2134 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2135 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2136 xfrm_ctx->ctx_len);
2137 }
2138
2139 hdr->sadb_msg_len = size / sizeof(uint64_t);
2140 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2141
2142 return 0;
2143 }
2144
2145 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2146 {
2147 struct sk_buff *out_skb;
2148 struct sadb_msg *out_hdr;
2149 int err;
2150
2151 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2152 if (IS_ERR(out_skb))
2153 return PTR_ERR(out_skb);
2154
2155 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2156 if (err < 0)
2157 return err;
2158
2159 out_hdr = (struct sadb_msg *) out_skb->data;
2160 out_hdr->sadb_msg_version = PF_KEY_V2;
2161
2162 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2163 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2164 else
2165 out_hdr->sadb_msg_type = event2poltype(c->event);
2166 out_hdr->sadb_msg_errno = 0;
2167 out_hdr->sadb_msg_seq = c->seq;
2168 out_hdr->sadb_msg_pid = c->portid;
2169 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2170 return 0;
2171
2172 }
2173
2174 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2175 {
2176 struct net *net = sock_net(sk);
2177 int err = 0;
2178 struct sadb_lifetime *lifetime;
2179 struct sadb_address *sa;
2180 struct sadb_x_policy *pol;
2181 struct xfrm_policy *xp;
2182 struct km_event c;
2183 struct sadb_x_sec_ctx *sec_ctx;
2184
2185 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2186 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2187 !ext_hdrs[SADB_X_EXT_POLICY-1])
2188 return -EINVAL;
2189
2190 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2191 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2192 return -EINVAL;
2193 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2194 return -EINVAL;
2195
2196 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2197 if (xp == NULL)
2198 return -ENOBUFS;
2199
2200 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2201 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2202 xp->priority = pol->sadb_x_policy_priority;
2203
2204 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2205 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2206 xp->selector.family = xp->family;
2207 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2208 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2209 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2210 if (xp->selector.sport)
2211 xp->selector.sport_mask = htons(0xffff);
2212
2213 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2214 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2215 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2216
2217 /* Amusing, we set this twice. KAME apps appear to set same value
2218 * in both addresses.
2219 */
2220 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2221
2222 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2223 if (xp->selector.dport)
2224 xp->selector.dport_mask = htons(0xffff);
2225
2226 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2227 if (sec_ctx != NULL) {
2228 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2229
2230 if (!uctx) {
2231 err = -ENOBUFS;
2232 goto out;
2233 }
2234
2235 err = security_xfrm_policy_alloc(&xp->security, uctx);
2236 kfree(uctx);
2237
2238 if (err)
2239 goto out;
2240 }
2241
2242 xp->lft.soft_byte_limit = XFRM_INF;
2243 xp->lft.hard_byte_limit = XFRM_INF;
2244 xp->lft.soft_packet_limit = XFRM_INF;
2245 xp->lft.hard_packet_limit = XFRM_INF;
2246 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2247 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2248 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2249 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2250 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2251 }
2252 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2253 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2254 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2255 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2256 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2257 }
2258 xp->xfrm_nr = 0;
2259 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2260 (err = parse_ipsecrequests(xp, pol)) < 0)
2261 goto out;
2262
2263 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2264 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2265
2266 xfrm_audit_policy_add(xp, err ? 0 : 1,
2267 audit_get_loginuid(current),
2268 audit_get_sessionid(current), 0);
2269
2270 if (err)
2271 goto out;
2272
2273 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2274 c.event = XFRM_MSG_UPDPOLICY;
2275 else
2276 c.event = XFRM_MSG_NEWPOLICY;
2277
2278 c.seq = hdr->sadb_msg_seq;
2279 c.portid = hdr->sadb_msg_pid;
2280
2281 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2282 xfrm_pol_put(xp);
2283 return 0;
2284
2285 out:
2286 xp->walk.dead = 1;
2287 xfrm_policy_destroy(xp);
2288 return err;
2289 }
2290
2291 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2292 {
2293 struct net *net = sock_net(sk);
2294 int err;
2295 struct sadb_address *sa;
2296 struct sadb_x_policy *pol;
2297 struct xfrm_policy *xp;
2298 struct xfrm_selector sel;
2299 struct km_event c;
2300 struct sadb_x_sec_ctx *sec_ctx;
2301 struct xfrm_sec_ctx *pol_ctx = NULL;
2302
2303 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2304 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2305 !ext_hdrs[SADB_X_EXT_POLICY-1])
2306 return -EINVAL;
2307
2308 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2309 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2310 return -EINVAL;
2311
2312 memset(&sel, 0, sizeof(sel));
2313
2314 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2315 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2316 sel.prefixlen_s = sa->sadb_address_prefixlen;
2317 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2318 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2319 if (sel.sport)
2320 sel.sport_mask = htons(0xffff);
2321
2322 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2323 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2324 sel.prefixlen_d = sa->sadb_address_prefixlen;
2325 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2326 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2327 if (sel.dport)
2328 sel.dport_mask = htons(0xffff);
2329
2330 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2331 if (sec_ctx != NULL) {
2332 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2333
2334 if (!uctx)
2335 return -ENOMEM;
2336
2337 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2338 kfree(uctx);
2339 if (err)
2340 return err;
2341 }
2342
2343 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2344 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2345 1, &err);
2346 security_xfrm_policy_free(pol_ctx);
2347 if (xp == NULL)
2348 return -ENOENT;
2349
2350 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2351 audit_get_loginuid(current),
2352 audit_get_sessionid(current), 0);
2353
2354 if (err)
2355 goto out;
2356
2357 c.seq = hdr->sadb_msg_seq;
2358 c.portid = hdr->sadb_msg_pid;
2359 c.data.byid = 0;
2360 c.event = XFRM_MSG_DELPOLICY;
2361 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2362
2363 out:
2364 xfrm_pol_put(xp);
2365 if (err == 0)
2366 xfrm_garbage_collect(net);
2367 return err;
2368 }
2369
2370 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2371 {
2372 int err;
2373 struct sk_buff *out_skb;
2374 struct sadb_msg *out_hdr;
2375 err = 0;
2376
2377 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2378 if (IS_ERR(out_skb)) {
2379 err = PTR_ERR(out_skb);
2380 goto out;
2381 }
2382 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2383 if (err < 0)
2384 goto out;
2385
2386 out_hdr = (struct sadb_msg *) out_skb->data;
2387 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2388 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2389 out_hdr->sadb_msg_satype = 0;
2390 out_hdr->sadb_msg_errno = 0;
2391 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2392 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2393 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2394 err = 0;
2395
2396 out:
2397 return err;
2398 }
2399
2400 #ifdef CONFIG_NET_KEY_MIGRATE
2401 static int pfkey_sockaddr_pair_size(sa_family_t family)
2402 {
2403 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2404 }
2405
2406 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2407 xfrm_address_t *saddr, xfrm_address_t *daddr,
2408 u16 *family)
2409 {
2410 int af, socklen;
2411
2412 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2413 return -EINVAL;
2414
2415 af = pfkey_sockaddr_extract(sa, saddr);
2416 if (!af)
2417 return -EINVAL;
2418
2419 socklen = pfkey_sockaddr_len(af);
2420 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2421 daddr) != af)
2422 return -EINVAL;
2423
2424 *family = af;
2425 return 0;
2426 }
2427
2428 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2429 struct xfrm_migrate *m)
2430 {
2431 int err;
2432 struct sadb_x_ipsecrequest *rq2;
2433 int mode;
2434
2435 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2436 len < rq1->sadb_x_ipsecrequest_len)
2437 return -EINVAL;
2438
2439 /* old endoints */
2440 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2441 rq1->sadb_x_ipsecrequest_len,
2442 &m->old_saddr, &m->old_daddr,
2443 &m->old_family);
2444 if (err)
2445 return err;
2446
2447 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2448 len -= rq1->sadb_x_ipsecrequest_len;
2449
2450 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2451 len < rq2->sadb_x_ipsecrequest_len)
2452 return -EINVAL;
2453
2454 /* new endpoints */
2455 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2456 rq2->sadb_x_ipsecrequest_len,
2457 &m->new_saddr, &m->new_daddr,
2458 &m->new_family);
2459 if (err)
2460 return err;
2461
2462 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2463 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2464 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2465 return -EINVAL;
2466
2467 m->proto = rq1->sadb_x_ipsecrequest_proto;
2468 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2469 return -EINVAL;
2470 m->mode = mode;
2471 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2472
2473 return ((int)(rq1->sadb_x_ipsecrequest_len +
2474 rq2->sadb_x_ipsecrequest_len));
2475 }
2476
2477 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2478 const struct sadb_msg *hdr, void * const *ext_hdrs)
2479 {
2480 int i, len, ret, err = -EINVAL;
2481 u8 dir;
2482 struct sadb_address *sa;
2483 struct sadb_x_kmaddress *kma;
2484 struct sadb_x_policy *pol;
2485 struct sadb_x_ipsecrequest *rq;
2486 struct xfrm_selector sel;
2487 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2488 struct xfrm_kmaddress k;
2489 struct net *net = sock_net(sk);
2490
2491 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2492 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2493 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2494 err = -EINVAL;
2495 goto out;
2496 }
2497
2498 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2499 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2500
2501 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2502 err = -EINVAL;
2503 goto out;
2504 }
2505
2506 if (kma) {
2507 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2508 k.reserved = kma->sadb_x_kmaddress_reserved;
2509 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2510 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2511 &k.local, &k.remote, &k.family);
2512 if (ret < 0) {
2513 err = ret;
2514 goto out;
2515 }
2516 }
2517
2518 dir = pol->sadb_x_policy_dir - 1;
2519 memset(&sel, 0, sizeof(sel));
2520
2521 /* set source address info of selector */
2522 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2523 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2524 sel.prefixlen_s = sa->sadb_address_prefixlen;
2525 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2526 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2527 if (sel.sport)
2528 sel.sport_mask = htons(0xffff);
2529
2530 /* set destination address info of selector */
2531 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2532 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2533 sel.prefixlen_d = sa->sadb_address_prefixlen;
2534 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2535 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2536 if (sel.dport)
2537 sel.dport_mask = htons(0xffff);
2538
2539 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2540
2541 /* extract ipsecrequests */
2542 i = 0;
2543 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2544
2545 while (len > 0 && i < XFRM_MAX_DEPTH) {
2546 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2547 if (ret < 0) {
2548 err = ret;
2549 goto out;
2550 } else {
2551 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2552 len -= ret;
2553 i++;
2554 }
2555 }
2556
2557 if (!i || len > 0) {
2558 err = -EINVAL;
2559 goto out;
2560 }
2561
2562 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2563 kma ? &k : NULL, net);
2564
2565 out:
2566 return err;
2567 }
2568 #else
2569 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2570 const struct sadb_msg *hdr, void * const *ext_hdrs)
2571 {
2572 return -ENOPROTOOPT;
2573 }
2574 #endif
2575
2576
2577 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2578 {
2579 struct net *net = sock_net(sk);
2580 unsigned int dir;
2581 int err = 0, delete;
2582 struct sadb_x_policy *pol;
2583 struct xfrm_policy *xp;
2584 struct km_event c;
2585
2586 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2587 return -EINVAL;
2588
2589 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2590 if (dir >= XFRM_POLICY_MAX)
2591 return -EINVAL;
2592
2593 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2594 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2595 dir, pol->sadb_x_policy_id, delete, &err);
2596 if (xp == NULL)
2597 return -ENOENT;
2598
2599 if (delete) {
2600 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2601 audit_get_loginuid(current),
2602 audit_get_sessionid(current), 0);
2603
2604 if (err)
2605 goto out;
2606 c.seq = hdr->sadb_msg_seq;
2607 c.portid = hdr->sadb_msg_pid;
2608 c.data.byid = 1;
2609 c.event = XFRM_MSG_DELPOLICY;
2610 km_policy_notify(xp, dir, &c);
2611 } else {
2612 err = key_pol_get_resp(sk, xp, hdr, dir);
2613 }
2614
2615 out:
2616 xfrm_pol_put(xp);
2617 if (delete && err == 0)
2618 xfrm_garbage_collect(net);
2619 return err;
2620 }
2621
2622 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2623 {
2624 struct pfkey_sock *pfk = ptr;
2625 struct sk_buff *out_skb;
2626 struct sadb_msg *out_hdr;
2627 int err;
2628
2629 if (!pfkey_can_dump(&pfk->sk))
2630 return -ENOBUFS;
2631
2632 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2633 if (IS_ERR(out_skb))
2634 return PTR_ERR(out_skb);
2635
2636 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2637 if (err < 0)
2638 return err;
2639
2640 out_hdr = (struct sadb_msg *) out_skb->data;
2641 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2642 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2643 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2644 out_hdr->sadb_msg_errno = 0;
2645 out_hdr->sadb_msg_seq = count + 1;
2646 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2647
2648 if (pfk->dump.skb)
2649 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2650 &pfk->sk, sock_net(&pfk->sk));
2651 pfk->dump.skb = out_skb;
2652
2653 return 0;
2654 }
2655
2656 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2657 {
2658 struct net *net = sock_net(&pfk->sk);
2659 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2660 }
2661
2662 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2663 {
2664 struct net *net = sock_net((struct sock *)pfk);
2665
2666 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2667 }
2668
2669 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2670 {
2671 struct pfkey_sock *pfk = pfkey_sk(sk);
2672
2673 if (pfk->dump.dump != NULL)
2674 return -EBUSY;
2675
2676 pfk->dump.msg_version = hdr->sadb_msg_version;
2677 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2678 pfk->dump.dump = pfkey_dump_sp;
2679 pfk->dump.done = pfkey_dump_sp_done;
2680 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2681
2682 return pfkey_do_dump(pfk);
2683 }
2684
2685 static int key_notify_policy_flush(const struct km_event *c)
2686 {
2687 struct sk_buff *skb_out;
2688 struct sadb_msg *hdr;
2689
2690 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2691 if (!skb_out)
2692 return -ENOBUFS;
2693 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2694 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2695 hdr->sadb_msg_seq = c->seq;
2696 hdr->sadb_msg_pid = c->portid;
2697 hdr->sadb_msg_version = PF_KEY_V2;
2698 hdr->sadb_msg_errno = (uint8_t) 0;
2699 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2700 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2701 hdr->sadb_msg_reserved = 0;
2702 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2703 return 0;
2704
2705 }
2706
2707 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2708 {
2709 struct net *net = sock_net(sk);
2710 struct km_event c;
2711 struct xfrm_audit audit_info;
2712 int err, err2;
2713
2714 audit_info.loginuid = audit_get_loginuid(current);
2715 audit_info.sessionid = audit_get_sessionid(current);
2716 audit_info.secid = 0;
2717 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2718 err2 = unicast_flush_resp(sk, hdr);
2719 if (err || err2) {
2720 if (err == -ESRCH) /* empty table - old silent behavior */
2721 return 0;
2722 return err;
2723 }
2724
2725 c.data.type = XFRM_POLICY_TYPE_MAIN;
2726 c.event = XFRM_MSG_FLUSHPOLICY;
2727 c.portid = hdr->sadb_msg_pid;
2728 c.seq = hdr->sadb_msg_seq;
2729 c.net = net;
2730 km_policy_notify(NULL, 0, &c);
2731
2732 return 0;
2733 }
2734
2735 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2736 const struct sadb_msg *hdr, void * const *ext_hdrs);
2737 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2738 [SADB_RESERVED] = pfkey_reserved,
2739 [SADB_GETSPI] = pfkey_getspi,
2740 [SADB_UPDATE] = pfkey_add,
2741 [SADB_ADD] = pfkey_add,
2742 [SADB_DELETE] = pfkey_delete,
2743 [SADB_GET] = pfkey_get,
2744 [SADB_ACQUIRE] = pfkey_acquire,
2745 [SADB_REGISTER] = pfkey_register,
2746 [SADB_EXPIRE] = NULL,
2747 [SADB_FLUSH] = pfkey_flush,
2748 [SADB_DUMP] = pfkey_dump,
2749 [SADB_X_PROMISC] = pfkey_promisc,
2750 [SADB_X_PCHANGE] = NULL,
2751 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2752 [SADB_X_SPDADD] = pfkey_spdadd,
2753 [SADB_X_SPDDELETE] = pfkey_spddelete,
2754 [SADB_X_SPDGET] = pfkey_spdget,
2755 [SADB_X_SPDACQUIRE] = NULL,
2756 [SADB_X_SPDDUMP] = pfkey_spddump,
2757 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2758 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2759 [SADB_X_SPDDELETE2] = pfkey_spdget,
2760 [SADB_X_MIGRATE] = pfkey_migrate,
2761 };
2762
2763 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2764 {
2765 void *ext_hdrs[SADB_EXT_MAX];
2766 int err;
2767
2768 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2769 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2770
2771 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2772 err = parse_exthdrs(skb, hdr, ext_hdrs);
2773 if (!err) {
2774 err = -EOPNOTSUPP;
2775 if (pfkey_funcs[hdr->sadb_msg_type])
2776 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2777 }
2778 return err;
2779 }
2780
2781 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2782 {
2783 struct sadb_msg *hdr = NULL;
2784
2785 if (skb->len < sizeof(*hdr)) {
2786 *errp = -EMSGSIZE;
2787 } else {
2788 hdr = (struct sadb_msg *) skb->data;
2789 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2790 hdr->sadb_msg_reserved != 0 ||
2791 (hdr->sadb_msg_type <= SADB_RESERVED ||
2792 hdr->sadb_msg_type > SADB_MAX)) {
2793 hdr = NULL;
2794 *errp = -EINVAL;
2795 } else if (hdr->sadb_msg_len != (skb->len /
2796 sizeof(uint64_t)) ||
2797 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2798 sizeof(uint64_t))) {
2799 hdr = NULL;
2800 *errp = -EMSGSIZE;
2801 } else {
2802 *errp = 0;
2803 }
2804 }
2805 return hdr;
2806 }
2807
2808 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2809 const struct xfrm_algo_desc *d)
2810 {
2811 unsigned int id = d->desc.sadb_alg_id;
2812
2813 if (id >= sizeof(t->aalgos) * 8)
2814 return 0;
2815
2816 return (t->aalgos >> id) & 1;
2817 }
2818
2819 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2820 const struct xfrm_algo_desc *d)
2821 {
2822 unsigned int id = d->desc.sadb_alg_id;
2823
2824 if (id >= sizeof(t->ealgos) * 8)
2825 return 0;
2826
2827 return (t->ealgos >> id) & 1;
2828 }
2829
2830 static int count_ah_combs(const struct xfrm_tmpl *t)
2831 {
2832 int i, sz = 0;
2833
2834 for (i = 0; ; i++) {
2835 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2836 if (!aalg)
2837 break;
2838 if (!aalg->pfkey_supported)
2839 continue;
2840 if (aalg_tmpl_set(t, aalg) && aalg->available)
2841 sz += sizeof(struct sadb_comb);
2842 }
2843 return sz + sizeof(struct sadb_prop);
2844 }
2845
2846 static int count_esp_combs(const struct xfrm_tmpl *t)
2847 {
2848 int i, k, sz = 0;
2849
2850 for (i = 0; ; i++) {
2851 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2852 if (!ealg)
2853 break;
2854
2855 if (!ealg->pfkey_supported)
2856 continue;
2857
2858 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2859 continue;
2860
2861 for (k = 1; ; k++) {
2862 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2863 if (!aalg)
2864 break;
2865
2866 if (!aalg->pfkey_supported)
2867 continue;
2868
2869 if (aalg_tmpl_set(t, aalg) && aalg->available)
2870 sz += sizeof(struct sadb_comb);
2871 }
2872 }
2873 return sz + sizeof(struct sadb_prop);
2874 }
2875
2876 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2877 {
2878 struct sadb_prop *p;
2879 int i;
2880
2881 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2882 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2883 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2884 p->sadb_prop_replay = 32;
2885 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2886
2887 for (i = 0; ; i++) {
2888 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2889 if (!aalg)
2890 break;
2891
2892 if (!aalg->pfkey_supported)
2893 continue;
2894
2895 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2896 struct sadb_comb *c;
2897 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2898 memset(c, 0, sizeof(*c));
2899 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2900 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2901 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2902 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2903 c->sadb_comb_hard_addtime = 24*60*60;
2904 c->sadb_comb_soft_addtime = 20*60*60;
2905 c->sadb_comb_hard_usetime = 8*60*60;
2906 c->sadb_comb_soft_usetime = 7*60*60;
2907 }
2908 }
2909 }
2910
2911 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2912 {
2913 struct sadb_prop *p;
2914 int i, k;
2915
2916 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2917 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2918 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2919 p->sadb_prop_replay = 32;
2920 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2921
2922 for (i=0; ; i++) {
2923 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2924 if (!ealg)
2925 break;
2926
2927 if (!ealg->pfkey_supported)
2928 continue;
2929
2930 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2931 continue;
2932
2933 for (k = 1; ; k++) {
2934 struct sadb_comb *c;
2935 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2936 if (!aalg)
2937 break;
2938 if (!aalg->pfkey_supported)
2939 continue;
2940 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2941 continue;
2942 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2943 memset(c, 0, sizeof(*c));
2944 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2945 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2946 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2947 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2948 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2949 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2950 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2951 c->sadb_comb_hard_addtime = 24*60*60;
2952 c->sadb_comb_soft_addtime = 20*60*60;
2953 c->sadb_comb_hard_usetime = 8*60*60;
2954 c->sadb_comb_soft_usetime = 7*60*60;
2955 }
2956 }
2957 }
2958
2959 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2960 {
2961 return 0;
2962 }
2963
2964 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2965 {
2966 struct sk_buff *out_skb;
2967 struct sadb_msg *out_hdr;
2968 int hard;
2969 int hsc;
2970
2971 hard = c->data.hard;
2972 if (hard)
2973 hsc = 2;
2974 else
2975 hsc = 1;
2976
2977 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2978 if (IS_ERR(out_skb))
2979 return PTR_ERR(out_skb);
2980
2981 out_hdr = (struct sadb_msg *) out_skb->data;
2982 out_hdr->sadb_msg_version = PF_KEY_V2;
2983 out_hdr->sadb_msg_type = SADB_EXPIRE;
2984 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2985 out_hdr->sadb_msg_errno = 0;
2986 out_hdr->sadb_msg_reserved = 0;
2987 out_hdr->sadb_msg_seq = 0;
2988 out_hdr->sadb_msg_pid = 0;
2989
2990 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2991 return 0;
2992 }
2993
2994 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2995 {
2996 struct net *net = x ? xs_net(x) : c->net;
2997 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2998
2999 if (atomic_read(&net_pfkey->socks_nr) == 0)
3000 return 0;
3001
3002 switch (c->event) {
3003 case XFRM_MSG_EXPIRE:
3004 return key_notify_sa_expire(x, c);
3005 case XFRM_MSG_DELSA:
3006 case XFRM_MSG_NEWSA:
3007 case XFRM_MSG_UPDSA:
3008 return key_notify_sa(x, c);
3009 case XFRM_MSG_FLUSHSA:
3010 return key_notify_sa_flush(c);
3011 case XFRM_MSG_NEWAE: /* not yet supported */
3012 break;
3013 default:
3014 pr_err("pfkey: Unknown SA event %d\n", c->event);
3015 break;
3016 }
3017
3018 return 0;
3019 }
3020
3021 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3022 {
3023 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3024 return 0;
3025
3026 switch (c->event) {
3027 case XFRM_MSG_POLEXPIRE:
3028 return key_notify_policy_expire(xp, c);
3029 case XFRM_MSG_DELPOLICY:
3030 case XFRM_MSG_NEWPOLICY:
3031 case XFRM_MSG_UPDPOLICY:
3032 return key_notify_policy(xp, dir, c);
3033 case XFRM_MSG_FLUSHPOLICY:
3034 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3035 break;
3036 return key_notify_policy_flush(c);
3037 default:
3038 pr_err("pfkey: Unknown policy event %d\n", c->event);
3039 break;
3040 }
3041
3042 return 0;
3043 }
3044
3045 static u32 get_acqseq(void)
3046 {
3047 u32 res;
3048 static atomic_t acqseq;
3049
3050 do {
3051 res = atomic_inc_return(&acqseq);
3052 } while (!res);
3053 return res;
3054 }
3055
3056 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3057 {
3058 struct sk_buff *skb;
3059 struct sadb_msg *hdr;
3060 struct sadb_address *addr;
3061 struct sadb_x_policy *pol;
3062 int sockaddr_size;
3063 int size;
3064 struct sadb_x_sec_ctx *sec_ctx;
3065 struct xfrm_sec_ctx *xfrm_ctx;
3066 int ctx_size = 0;
3067
3068 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3069 if (!sockaddr_size)
3070 return -EINVAL;
3071
3072 size = sizeof(struct sadb_msg) +
3073 (sizeof(struct sadb_address) * 2) +
3074 (sockaddr_size * 2) +
3075 sizeof(struct sadb_x_policy);
3076
3077 if (x->id.proto == IPPROTO_AH)
3078 size += count_ah_combs(t);
3079 else if (x->id.proto == IPPROTO_ESP)
3080 size += count_esp_combs(t);
3081
3082 if ((xfrm_ctx = x->security)) {
3083 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3084 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3085 }
3086
3087 skb = alloc_skb(size + 16, GFP_ATOMIC);
3088 if (skb == NULL)
3089 return -ENOMEM;
3090
3091 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3092 hdr->sadb_msg_version = PF_KEY_V2;
3093 hdr->sadb_msg_type = SADB_ACQUIRE;
3094 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3095 hdr->sadb_msg_len = size / sizeof(uint64_t);
3096 hdr->sadb_msg_errno = 0;
3097 hdr->sadb_msg_reserved = 0;
3098 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3099 hdr->sadb_msg_pid = 0;
3100
3101 /* src address */
3102 addr = (struct sadb_address*) skb_put(skb,
3103 sizeof(struct sadb_address)+sockaddr_size);
3104 addr->sadb_address_len =
3105 (sizeof(struct sadb_address)+sockaddr_size)/
3106 sizeof(uint64_t);
3107 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3108 addr->sadb_address_proto = 0;
3109 addr->sadb_address_reserved = 0;
3110 addr->sadb_address_prefixlen =
3111 pfkey_sockaddr_fill(&x->props.saddr, 0,
3112 (struct sockaddr *) (addr + 1),
3113 x->props.family);
3114 if (!addr->sadb_address_prefixlen)
3115 BUG();
3116
3117 /* dst address */
3118 addr = (struct sadb_address*) skb_put(skb,
3119 sizeof(struct sadb_address)+sockaddr_size);
3120 addr->sadb_address_len =
3121 (sizeof(struct sadb_address)+sockaddr_size)/
3122 sizeof(uint64_t);
3123 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3124 addr->sadb_address_proto = 0;
3125 addr->sadb_address_reserved = 0;
3126 addr->sadb_address_prefixlen =
3127 pfkey_sockaddr_fill(&x->id.daddr, 0,
3128 (struct sockaddr *) (addr + 1),
3129 x->props.family);
3130 if (!addr->sadb_address_prefixlen)
3131 BUG();
3132
3133 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3134 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3135 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3136 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3137 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3138 pol->sadb_x_policy_reserved = 0;
3139 pol->sadb_x_policy_id = xp->index;
3140 pol->sadb_x_policy_priority = xp->priority;
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_reserved = 0;
3529 pol->sadb_x_policy_id = 0;
3530 pol->sadb_x_policy_priority = 0;
3531
3532 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3533 /* old ipsecrequest */
3534 int mode = pfkey_mode_from_xfrm(mp->mode);
3535 if (mode < 0)
3536 goto err;
3537 if (set_ipsecrequest(skb, mp->proto, mode,
3538 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3539 mp->reqid, mp->old_family,
3540 &mp->old_saddr, &mp->old_daddr) < 0)
3541 goto err;
3542
3543 /* new ipsecrequest */
3544 if (set_ipsecrequest(skb, mp->proto, mode,
3545 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3546 mp->reqid, mp->new_family,
3547 &mp->new_saddr, &mp->new_daddr) < 0)
3548 goto err;
3549 }
3550
3551 /* broadcast migrate message to sockets */
3552 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3553
3554 return 0;
3555
3556 err:
3557 kfree_skb(skb);
3558 return -EINVAL;
3559 }
3560 #else
3561 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3562 const struct xfrm_migrate *m, int num_bundles,
3563 const struct xfrm_kmaddress *k)
3564 {
3565 return -ENOPROTOOPT;
3566 }
3567 #endif
3568
3569 static int pfkey_sendmsg(struct kiocb *kiocb,
3570 struct socket *sock, struct msghdr *msg, size_t len)
3571 {
3572 struct sock *sk = sock->sk;
3573 struct sk_buff *skb = NULL;
3574 struct sadb_msg *hdr = NULL;
3575 int err;
3576 struct net *net = sock_net(sk);
3577
3578 err = -EOPNOTSUPP;
3579 if (msg->msg_flags & MSG_OOB)
3580 goto out;
3581
3582 err = -EMSGSIZE;
3583 if ((unsigned int)len > sk->sk_sndbuf - 32)
3584 goto out;
3585
3586 err = -ENOBUFS;
3587 skb = alloc_skb(len, GFP_KERNEL);
3588 if (skb == NULL)
3589 goto out;
3590
3591 err = -EFAULT;
3592 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3593 goto out;
3594
3595 hdr = pfkey_get_base_msg(skb, &err);
3596 if (!hdr)
3597 goto out;
3598
3599 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3600 err = pfkey_process(sk, skb, hdr);
3601 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3602
3603 out:
3604 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3605 err = 0;
3606 kfree_skb(skb);
3607
3608 return err ? : len;
3609 }
3610
3611 static int pfkey_recvmsg(struct kiocb *kiocb,
3612 struct socket *sock, struct msghdr *msg, size_t len,
3613 int flags)
3614 {
3615 struct sock *sk = sock->sk;
3616 struct pfkey_sock *pfk = pfkey_sk(sk);
3617 struct sk_buff *skb;
3618 int copied, err;
3619
3620 err = -EINVAL;
3621 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3622 goto out;
3623
3624 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3625 if (skb == NULL)
3626 goto out;
3627
3628 copied = skb->len;
3629 if (copied > len) {
3630 msg->msg_flags |= MSG_TRUNC;
3631 copied = len;
3632 }
3633
3634 skb_reset_transport_header(skb);
3635 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3636 if (err)
3637 goto out_free;
3638
3639 sock_recv_ts_and_drops(msg, sk, skb);
3640
3641 err = (flags & MSG_TRUNC) ? skb->len : copied;
3642
3643 if (pfk->dump.dump != NULL &&
3644 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3645 pfkey_do_dump(pfk);
3646
3647 out_free:
3648 skb_free_datagram(sk, skb);
3649 out:
3650 return err;
3651 }
3652
3653 static const struct proto_ops pfkey_ops = {
3654 .family = PF_KEY,
3655 .owner = THIS_MODULE,
3656 /* Operations that make no sense on pfkey sockets. */
3657 .bind = sock_no_bind,
3658 .connect = sock_no_connect,
3659 .socketpair = sock_no_socketpair,
3660 .accept = sock_no_accept,
3661 .getname = sock_no_getname,
3662 .ioctl = sock_no_ioctl,
3663 .listen = sock_no_listen,
3664 .shutdown = sock_no_shutdown,
3665 .setsockopt = sock_no_setsockopt,
3666 .getsockopt = sock_no_getsockopt,
3667 .mmap = sock_no_mmap,
3668 .sendpage = sock_no_sendpage,
3669
3670 /* Now the operations that really occur. */
3671 .release = pfkey_release,
3672 .poll = datagram_poll,
3673 .sendmsg = pfkey_sendmsg,
3674 .recvmsg = pfkey_recvmsg,
3675 };
3676
3677 static const struct net_proto_family pfkey_family_ops = {
3678 .family = PF_KEY,
3679 .create = pfkey_create,
3680 .owner = THIS_MODULE,
3681 };
3682
3683 #ifdef CONFIG_PROC_FS
3684 static int pfkey_seq_show(struct seq_file *f, void *v)
3685 {
3686 struct sock *s = sk_entry(v);
3687
3688 if (v == SEQ_START_TOKEN)
3689 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3690 else
3691 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3692 s,
3693 atomic_read(&s->sk_refcnt),
3694 sk_rmem_alloc_get(s),
3695 sk_wmem_alloc_get(s),
3696 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3697 sock_i_ino(s)
3698 );
3699 return 0;
3700 }
3701
3702 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3703 __acquires(rcu)
3704 {
3705 struct net *net = seq_file_net(f);
3706 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3707
3708 rcu_read_lock();
3709 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3710 }
3711
3712 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3713 {
3714 struct net *net = seq_file_net(f);
3715 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3716
3717 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3718 }
3719
3720 static void pfkey_seq_stop(struct seq_file *f, void *v)
3721 __releases(rcu)
3722 {
3723 rcu_read_unlock();
3724 }
3725
3726 static const struct seq_operations pfkey_seq_ops = {
3727 .start = pfkey_seq_start,
3728 .next = pfkey_seq_next,
3729 .stop = pfkey_seq_stop,
3730 .show = pfkey_seq_show,
3731 };
3732
3733 static int pfkey_seq_open(struct inode *inode, struct file *file)
3734 {
3735 return seq_open_net(inode, file, &pfkey_seq_ops,
3736 sizeof(struct seq_net_private));
3737 }
3738
3739 static const struct file_operations pfkey_proc_ops = {
3740 .open = pfkey_seq_open,
3741 .read = seq_read,
3742 .llseek = seq_lseek,
3743 .release = seq_release_net,
3744 };
3745
3746 static int __net_init pfkey_init_proc(struct net *net)
3747 {
3748 struct proc_dir_entry *e;
3749
3750 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3751 if (e == NULL)
3752 return -ENOMEM;
3753
3754 return 0;
3755 }
3756
3757 static void __net_exit pfkey_exit_proc(struct net *net)
3758 {
3759 remove_proc_entry("pfkey", net->proc_net);
3760 }
3761 #else
3762 static inline int pfkey_init_proc(struct net *net)
3763 {
3764 return 0;
3765 }
3766
3767 static inline void pfkey_exit_proc(struct net *net)
3768 {
3769 }
3770 #endif
3771
3772 static struct xfrm_mgr pfkeyv2_mgr =
3773 {
3774 .id = "pfkeyv2",
3775 .notify = pfkey_send_notify,
3776 .acquire = pfkey_send_acquire,
3777 .compile_policy = pfkey_compile_policy,
3778 .new_mapping = pfkey_send_new_mapping,
3779 .notify_policy = pfkey_send_policy_notify,
3780 .migrate = pfkey_send_migrate,
3781 };
3782
3783 static int __net_init pfkey_net_init(struct net *net)
3784 {
3785 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3786 int rv;
3787
3788 INIT_HLIST_HEAD(&net_pfkey->table);
3789 atomic_set(&net_pfkey->socks_nr, 0);
3790
3791 rv = pfkey_init_proc(net);
3792
3793 return rv;
3794 }
3795
3796 static void __net_exit pfkey_net_exit(struct net *net)
3797 {
3798 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3799
3800 pfkey_exit_proc(net);
3801 BUG_ON(!hlist_empty(&net_pfkey->table));
3802 }
3803
3804 static struct pernet_operations pfkey_net_ops = {
3805 .init = pfkey_net_init,
3806 .exit = pfkey_net_exit,
3807 .id = &pfkey_net_id,
3808 .size = sizeof(struct netns_pfkey),
3809 };
3810
3811 static void __exit ipsec_pfkey_exit(void)
3812 {
3813 xfrm_unregister_km(&pfkeyv2_mgr);
3814 sock_unregister(PF_KEY);
3815 unregister_pernet_subsys(&pfkey_net_ops);
3816 proto_unregister(&key_proto);
3817 }
3818
3819 static int __init ipsec_pfkey_init(void)
3820 {
3821 int err = proto_register(&key_proto, 0);
3822
3823 if (err != 0)
3824 goto out;
3825
3826 err = register_pernet_subsys(&pfkey_net_ops);
3827 if (err != 0)
3828 goto out_unregister_key_proto;
3829 err = sock_register(&pfkey_family_ops);
3830 if (err != 0)
3831 goto out_unregister_pernet;
3832 err = xfrm_register_km(&pfkeyv2_mgr);
3833 if (err != 0)
3834 goto out_sock_unregister;
3835 out:
3836 return err;
3837
3838 out_sock_unregister:
3839 sock_unregister(PF_KEY);
3840 out_unregister_pernet:
3841 unregister_pernet_subsys(&pfkey_net_ops);
3842 out_unregister_key_proto:
3843 proto_unregister(&key_proto);
3844 goto out;
3845 }
3846
3847 module_init(ipsec_pfkey_init);
3848 module_exit(ipsec_pfkey_exit);
3849 MODULE_LICENSE("GPL");
3850 MODULE_ALIAS_NETPROTO(PF_KEY);
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