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Linux 4.1.18
[linux/fpc-iii.git] / net / key / af_key.c
blobf0d52d721b3a4405b47f38d8f5d6c1990cbf8b5f
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);
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 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
369 };
370
371 /* Verify sadb_address_{len,prefixlen} against sa_family. */
372 static int verify_address_len(const void *p)
373 {
374 const struct sadb_address *sp = p;
375 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
376 const struct sockaddr_in *sin;
377 #if IS_ENABLED(CONFIG_IPV6)
378 const struct sockaddr_in6 *sin6;
379 #endif
380 int len;
381
382 switch (addr->sa_family) {
383 case AF_INET:
384 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
385 if (sp->sadb_address_len != len ||
386 sp->sadb_address_prefixlen > 32)
387 return -EINVAL;
388 break;
389 #if IS_ENABLED(CONFIG_IPV6)
390 case AF_INET6:
391 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
392 if (sp->sadb_address_len != len ||
393 sp->sadb_address_prefixlen > 128)
394 return -EINVAL;
395 break;
396 #endif
397 default:
398 /* It is user using kernel to keep track of security
399 * associations for another protocol, such as
400 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
401 * lengths.
402 *
403 * XXX Actually, association/policy database is not yet
404 * XXX able to cope with arbitrary sockaddr families.
405 * XXX When it can, remove this -EINVAL. -DaveM
406 */
407 return -EINVAL;
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 gfp_t gfp)
438 {
439 struct xfrm_user_sec_ctx *uctx = NULL;
440 int ctx_size = sec_ctx->sadb_x_ctx_len;
441
442 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
443
444 if (!uctx)
445 return NULL;
446
447 uctx->len = pfkey_sec_ctx_len(sec_ctx);
448 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
449 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
450 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
451 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
452 memcpy(uctx + 1, sec_ctx + 1,
453 uctx->ctx_len);
454
455 return uctx;
456 }
457
458 static int present_and_same_family(const struct sadb_address *src,
459 const struct sadb_address *dst)
460 {
461 const struct sockaddr *s_addr, *d_addr;
462
463 if (!src || !dst)
464 return 0;
465
466 s_addr = (const struct sockaddr *)(src + 1);
467 d_addr = (const struct sockaddr *)(dst + 1);
468 if (s_addr->sa_family != d_addr->sa_family)
469 return 0;
470 if (s_addr->sa_family != AF_INET
471 #if IS_ENABLED(CONFIG_IPV6)
472 && s_addr->sa_family != AF_INET6
473 #endif
474 )
475 return 0;
476
477 return 1;
478 }
479
480 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
481 {
482 const char *p = (char *) hdr;
483 int len = skb->len;
484
485 len -= sizeof(*hdr);
486 p += sizeof(*hdr);
487 while (len > 0) {
488 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
489 uint16_t ext_type;
490 int ext_len;
491
492 ext_len = ehdr->sadb_ext_len;
493 ext_len *= sizeof(uint64_t);
494 ext_type = ehdr->sadb_ext_type;
495 if (ext_len < sizeof(uint64_t) ||
496 ext_len > len ||
497 ext_type == SADB_EXT_RESERVED)
498 return -EINVAL;
499
500 if (ext_type <= SADB_EXT_MAX) {
501 int min = (int) sadb_ext_min_len[ext_type];
502 if (ext_len < min)
503 return -EINVAL;
504 if (ext_hdrs[ext_type-1] != NULL)
505 return -EINVAL;
506 if (ext_type == SADB_EXT_ADDRESS_SRC ||
507 ext_type == SADB_EXT_ADDRESS_DST ||
508 ext_type == SADB_EXT_ADDRESS_PROXY ||
509 ext_type == SADB_X_EXT_NAT_T_OA) {
510 if (verify_address_len(p))
511 return -EINVAL;
512 }
513 if (ext_type == SADB_X_EXT_SEC_CTX) {
514 if (verify_sec_ctx_len(p))
515 return -EINVAL;
516 }
517 ext_hdrs[ext_type-1] = (void *) p;
518 }
519 p += ext_len;
520 len -= ext_len;
521 }
522
523 return 0;
524 }
525
526 static uint16_t
527 pfkey_satype2proto(uint8_t satype)
528 {
529 switch (satype) {
530 case SADB_SATYPE_UNSPEC:
531 return IPSEC_PROTO_ANY;
532 case SADB_SATYPE_AH:
533 return IPPROTO_AH;
534 case SADB_SATYPE_ESP:
535 return IPPROTO_ESP;
536 case SADB_X_SATYPE_IPCOMP:
537 return IPPROTO_COMP;
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 default:
555 return 0;
556 }
557 /* NOTREACHED */
558 }
559
560 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
561 * say specifically 'just raw sockets' as we encode them as 255.
562 */
563
564 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
565 {
566 return proto == IPSEC_PROTO_ANY ? 0 : proto;
567 }
568
569 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
570 {
571 return proto ? proto : IPSEC_PROTO_ANY;
572 }
573
574 static inline int pfkey_sockaddr_len(sa_family_t family)
575 {
576 switch (family) {
577 case AF_INET:
578 return sizeof(struct sockaddr_in);
579 #if IS_ENABLED(CONFIG_IPV6)
580 case AF_INET6:
581 return sizeof(struct sockaddr_in6);
582 #endif
583 }
584 return 0;
585 }
586
587 static
588 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
589 {
590 switch (sa->sa_family) {
591 case AF_INET:
592 xaddr->a4 =
593 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
594 return AF_INET;
595 #if IS_ENABLED(CONFIG_IPV6)
596 case AF_INET6:
597 memcpy(xaddr->a6,
598 &((struct sockaddr_in6 *)sa)->sin6_addr,
599 sizeof(struct in6_addr));
600 return AF_INET6;
601 #endif
602 }
603 return 0;
604 }
605
606 static
607 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
608 {
609 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
610 xaddr);
611 }
612
613 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
614 {
615 const struct sadb_sa *sa;
616 const struct sadb_address *addr;
617 uint16_t proto;
618 unsigned short family;
619 xfrm_address_t *xaddr;
620
621 sa = ext_hdrs[SADB_EXT_SA - 1];
622 if (sa == NULL)
623 return NULL;
624
625 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
626 if (proto == 0)
627 return NULL;
628
629 /* sadb_address_len should be checked by caller */
630 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
631 if (addr == NULL)
632 return NULL;
633
634 family = ((const struct sockaddr *)(addr + 1))->sa_family;
635 switch (family) {
636 case AF_INET:
637 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
638 break;
639 #if IS_ENABLED(CONFIG_IPV6)
640 case AF_INET6:
641 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
642 break;
643 #endif
644 default:
645 xaddr = NULL;
646 }
647
648 if (!xaddr)
649 return NULL;
650
651 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
652 }
653
654 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
655
656 static int
657 pfkey_sockaddr_size(sa_family_t family)
658 {
659 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
660 }
661
662 static inline int pfkey_mode_from_xfrm(int mode)
663 {
664 switch(mode) {
665 case XFRM_MODE_TRANSPORT:
666 return IPSEC_MODE_TRANSPORT;
667 case XFRM_MODE_TUNNEL:
668 return IPSEC_MODE_TUNNEL;
669 case XFRM_MODE_BEET:
670 return IPSEC_MODE_BEET;
671 default:
672 return -1;
673 }
674 }
675
676 static inline int pfkey_mode_to_xfrm(int mode)
677 {
678 switch(mode) {
679 case IPSEC_MODE_ANY: /*XXX*/
680 case IPSEC_MODE_TRANSPORT:
681 return XFRM_MODE_TRANSPORT;
682 case IPSEC_MODE_TUNNEL:
683 return XFRM_MODE_TUNNEL;
684 case IPSEC_MODE_BEET:
685 return XFRM_MODE_BEET;
686 default:
687 return -1;
688 }
689 }
690
691 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
692 struct sockaddr *sa,
693 unsigned short family)
694 {
695 switch (family) {
696 case AF_INET:
697 {
698 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
699 sin->sin_family = AF_INET;
700 sin->sin_port = port;
701 sin->sin_addr.s_addr = xaddr->a4;
702 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
703 return 32;
704 }
705 #if IS_ENABLED(CONFIG_IPV6)
706 case AF_INET6:
707 {
708 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
709 sin6->sin6_family = AF_INET6;
710 sin6->sin6_port = port;
711 sin6->sin6_flowinfo = 0;
712 sin6->sin6_addr = xaddr->in6;
713 sin6->sin6_scope_id = 0;
714 return 128;
715 }
716 #endif
717 }
718 return 0;
719 }
720
721 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
722 int add_keys, int hsc)
723 {
724 struct sk_buff *skb;
725 struct sadb_msg *hdr;
726 struct sadb_sa *sa;
727 struct sadb_lifetime *lifetime;
728 struct sadb_address *addr;
729 struct sadb_key *key;
730 struct sadb_x_sa2 *sa2;
731 struct sadb_x_sec_ctx *sec_ctx;
732 struct xfrm_sec_ctx *xfrm_ctx;
733 int ctx_size = 0;
734 int size;
735 int auth_key_size = 0;
736 int encrypt_key_size = 0;
737 int sockaddr_size;
738 struct xfrm_encap_tmpl *natt = NULL;
739 int mode;
740
741 /* address family check */
742 sockaddr_size = pfkey_sockaddr_size(x->props.family);
743 if (!sockaddr_size)
744 return ERR_PTR(-EINVAL);
745
746 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
747 key(AE), (identity(SD),) (sensitivity)> */
748 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
749 sizeof(struct sadb_lifetime) +
750 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
751 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
752 sizeof(struct sadb_address)*2 +
753 sockaddr_size*2 +
754 sizeof(struct sadb_x_sa2);
755
756 if ((xfrm_ctx = x->security)) {
757 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
758 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
759 }
760
761 /* identity & sensitivity */
762 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
763 size += sizeof(struct sadb_address) + sockaddr_size;
764
765 if (add_keys) {
766 if (x->aalg && x->aalg->alg_key_len) {
767 auth_key_size =
768 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
769 size += sizeof(struct sadb_key) + auth_key_size;
770 }
771 if (x->ealg && x->ealg->alg_key_len) {
772 encrypt_key_size =
773 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
774 size += sizeof(struct sadb_key) + encrypt_key_size;
775 }
776 }
777 if (x->encap)
778 natt = x->encap;
779
780 if (natt && natt->encap_type) {
781 size += sizeof(struct sadb_x_nat_t_type);
782 size += sizeof(struct sadb_x_nat_t_port);
783 size += sizeof(struct sadb_x_nat_t_port);
784 }
785
786 skb = alloc_skb(size + 16, GFP_ATOMIC);
787 if (skb == NULL)
788 return ERR_PTR(-ENOBUFS);
789
790 /* call should fill header later */
791 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
792 memset(hdr, 0, size); /* XXX do we need this ? */
793 hdr->sadb_msg_len = size / sizeof(uint64_t);
794
795 /* sa */
796 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
797 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
798 sa->sadb_sa_exttype = SADB_EXT_SA;
799 sa->sadb_sa_spi = x->id.spi;
800 sa->sadb_sa_replay = x->props.replay_window;
801 switch (x->km.state) {
802 case XFRM_STATE_VALID:
803 sa->sadb_sa_state = x->km.dying ?
804 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
805 break;
806 case XFRM_STATE_ACQ:
807 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
808 break;
809 default:
810 sa->sadb_sa_state = SADB_SASTATE_DEAD;
811 break;
812 }
813 sa->sadb_sa_auth = 0;
814 if (x->aalg) {
815 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
816 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
817 a->desc.sadb_alg_id : 0;
818 }
819 sa->sadb_sa_encrypt = 0;
820 BUG_ON(x->ealg && x->calg);
821 if (x->ealg) {
822 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
823 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
824 a->desc.sadb_alg_id : 0;
825 }
826 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
827 if (x->calg) {
828 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
829 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
830 a->desc.sadb_alg_id : 0;
831 }
832
833 sa->sadb_sa_flags = 0;
834 if (x->props.flags & XFRM_STATE_NOECN)
835 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
836 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
837 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
838 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
839 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
840
841 /* hard time */
842 if (hsc & 2) {
843 lifetime = (struct sadb_lifetime *) skb_put(skb,
844 sizeof(struct sadb_lifetime));
845 lifetime->sadb_lifetime_len =
846 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
847 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
848 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
849 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
850 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
851 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
852 }
853 /* soft time */
854 if (hsc & 1) {
855 lifetime = (struct sadb_lifetime *) skb_put(skb,
856 sizeof(struct sadb_lifetime));
857 lifetime->sadb_lifetime_len =
858 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
859 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
860 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
861 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
862 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
863 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
864 }
865 /* current time */
866 lifetime = (struct sadb_lifetime *) skb_put(skb,
867 sizeof(struct sadb_lifetime));
868 lifetime->sadb_lifetime_len =
869 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
870 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
871 lifetime->sadb_lifetime_allocations = x->curlft.packets;
872 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
873 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
874 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
875 /* src address */
876 addr = (struct sadb_address*) skb_put(skb,
877 sizeof(struct sadb_address)+sockaddr_size);
878 addr->sadb_address_len =
879 (sizeof(struct sadb_address)+sockaddr_size)/
880 sizeof(uint64_t);
881 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
882 /* "if the ports are non-zero, then the sadb_address_proto field,
883 normally zero, MUST be filled in with the transport
884 protocol's number." - RFC2367 */
885 addr->sadb_address_proto = 0;
886 addr->sadb_address_reserved = 0;
887
888 addr->sadb_address_prefixlen =
889 pfkey_sockaddr_fill(&x->props.saddr, 0,
890 (struct sockaddr *) (addr + 1),
891 x->props.family);
892 if (!addr->sadb_address_prefixlen)
893 BUG();
894
895 /* dst address */
896 addr = (struct sadb_address*) skb_put(skb,
897 sizeof(struct sadb_address)+sockaddr_size);
898 addr->sadb_address_len =
899 (sizeof(struct sadb_address)+sockaddr_size)/
900 sizeof(uint64_t);
901 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
902 addr->sadb_address_proto = 0;
903 addr->sadb_address_reserved = 0;
904
905 addr->sadb_address_prefixlen =
906 pfkey_sockaddr_fill(&x->id.daddr, 0,
907 (struct sockaddr *) (addr + 1),
908 x->props.family);
909 if (!addr->sadb_address_prefixlen)
910 BUG();
911
912 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
913 x->props.family)) {
914 addr = (struct sadb_address*) skb_put(skb,
915 sizeof(struct sadb_address)+sockaddr_size);
916 addr->sadb_address_len =
917 (sizeof(struct sadb_address)+sockaddr_size)/
918 sizeof(uint64_t);
919 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
920 addr->sadb_address_proto =
921 pfkey_proto_from_xfrm(x->sel.proto);
922 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
923 addr->sadb_address_reserved = 0;
924
925 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
926 (struct sockaddr *) (addr + 1),
927 x->props.family);
928 }
929
930 /* auth key */
931 if (add_keys && auth_key_size) {
932 key = (struct sadb_key *) skb_put(skb,
933 sizeof(struct sadb_key)+auth_key_size);
934 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
935 sizeof(uint64_t);
936 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
937 key->sadb_key_bits = x->aalg->alg_key_len;
938 key->sadb_key_reserved = 0;
939 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
940 }
941 /* encrypt key */
942 if (add_keys && encrypt_key_size) {
943 key = (struct sadb_key *) skb_put(skb,
944 sizeof(struct sadb_key)+encrypt_key_size);
945 key->sadb_key_len = (sizeof(struct sadb_key) +
946 encrypt_key_size) / sizeof(uint64_t);
947 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
948 key->sadb_key_bits = x->ealg->alg_key_len;
949 key->sadb_key_reserved = 0;
950 memcpy(key + 1, x->ealg->alg_key,
951 (x->ealg->alg_key_len+7)/8);
952 }
953
954 /* sa */
955 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
956 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
957 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
958 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
959 kfree_skb(skb);
960 return ERR_PTR(-EINVAL);
961 }
962 sa2->sadb_x_sa2_mode = mode;
963 sa2->sadb_x_sa2_reserved1 = 0;
964 sa2->sadb_x_sa2_reserved2 = 0;
965 sa2->sadb_x_sa2_sequence = 0;
966 sa2->sadb_x_sa2_reqid = x->props.reqid;
967
968 if (natt && natt->encap_type) {
969 struct sadb_x_nat_t_type *n_type;
970 struct sadb_x_nat_t_port *n_port;
971
972 /* type */
973 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
974 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
975 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
976 n_type->sadb_x_nat_t_type_type = natt->encap_type;
977 n_type->sadb_x_nat_t_type_reserved[0] = 0;
978 n_type->sadb_x_nat_t_type_reserved[1] = 0;
979 n_type->sadb_x_nat_t_type_reserved[2] = 0;
980
981 /* source port */
982 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
983 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
984 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
985 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
986 n_port->sadb_x_nat_t_port_reserved = 0;
987
988 /* dest port */
989 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
990 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
991 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
992 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
993 n_port->sadb_x_nat_t_port_reserved = 0;
994 }
995
996 /* security context */
997 if (xfrm_ctx) {
998 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
999 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1000 sec_ctx->sadb_x_sec_len =
1001 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1002 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1003 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1004 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1005 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1006 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1007 xfrm_ctx->ctx_len);
1008 }
1009
1010 return skb;
1011 }
1012
1013
1014 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015 {
1016 struct sk_buff *skb;
1017
1018 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1019
1020 return skb;
1021 }
1022
1023 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024 int hsc)
1025 {
1026 return __pfkey_xfrm_state2msg(x, 0, hsc);
1027 }
1028
1029 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030 const struct sadb_msg *hdr,
1031 void * const *ext_hdrs)
1032 {
1033 struct xfrm_state *x;
1034 const struct sadb_lifetime *lifetime;
1035 const struct sadb_sa *sa;
1036 const struct sadb_key *key;
1037 const struct sadb_x_sec_ctx *sec_ctx;
1038 uint16_t proto;
1039 int err;
1040
1041
1042 sa = ext_hdrs[SADB_EXT_SA - 1];
1043 if (!sa ||
1044 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1045 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1046 return ERR_PTR(-EINVAL);
1047 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1048 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1049 return ERR_PTR(-EINVAL);
1050 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1051 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1052 return ERR_PTR(-EINVAL);
1053 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1054 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1055 return ERR_PTR(-EINVAL);
1056
1057 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1058 if (proto == 0)
1059 return ERR_PTR(-EINVAL);
1060
1061 /* default error is no buffer space */
1062 err = -ENOBUFS;
1063
1064 /* RFC2367:
1065
1066 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1067 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1068 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1069 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1070 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1071 not true.
1072
1073 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1074 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1075 */
1076 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1077 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1078 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1079 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1080 return ERR_PTR(-EINVAL);
1081 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1082 if (key != NULL &&
1083 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1084 ((key->sadb_key_bits+7) / 8 == 0 ||
1085 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1086 return ERR_PTR(-EINVAL);
1087 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1088 if (key != NULL &&
1089 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1090 ((key->sadb_key_bits+7) / 8 == 0 ||
1091 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092 return ERR_PTR(-EINVAL);
1093
1094 x = xfrm_state_alloc(net);
1095 if (x == NULL)
1096 return ERR_PTR(-ENOBUFS);
1097
1098 x->id.proto = proto;
1099 x->id.spi = sa->sadb_sa_spi;
1100 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1101 (sizeof(x->replay.bitmap) * 8));
1102 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103 x->props.flags |= XFRM_STATE_NOECN;
1104 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110 if (lifetime != NULL) {
1111 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115 }
1116 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117 if (lifetime != NULL) {
1118 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122 }
1123
1124 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125 if (sec_ctx != NULL) {
1126 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1127
1128 if (!uctx)
1129 goto out;
1130
1131 err = security_xfrm_state_alloc(x, uctx);
1132 kfree(uctx);
1133
1134 if (err)
1135 goto out;
1136 }
1137
1138 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139 if (sa->sadb_sa_auth) {
1140 int keysize = 0;
1141 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142 if (!a || !a->pfkey_supported) {
1143 err = -ENOSYS;
1144 goto out;
1145 }
1146 if (key)
1147 keysize = (key->sadb_key_bits + 7) / 8;
1148 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149 if (!x->aalg)
1150 goto out;
1151 strcpy(x->aalg->alg_name, a->name);
1152 x->aalg->alg_key_len = 0;
1153 if (key) {
1154 x->aalg->alg_key_len = key->sadb_key_bits;
1155 memcpy(x->aalg->alg_key, key+1, keysize);
1156 }
1157 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158 x->props.aalgo = sa->sadb_sa_auth;
1159 /* x->algo.flags = sa->sadb_sa_flags; */
1160 }
1161 if (sa->sadb_sa_encrypt) {
1162 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164 if (!a || !a->pfkey_supported) {
1165 err = -ENOSYS;
1166 goto out;
1167 }
1168 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169 if (!x->calg)
1170 goto out;
1171 strcpy(x->calg->alg_name, a->name);
1172 x->props.calgo = sa->sadb_sa_encrypt;
1173 } else {
1174 int keysize = 0;
1175 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176 if (!a || !a->pfkey_supported) {
1177 err = -ENOSYS;
1178 goto out;
1179 }
1180 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181 if (key)
1182 keysize = (key->sadb_key_bits + 7) / 8;
1183 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184 if (!x->ealg)
1185 goto out;
1186 strcpy(x->ealg->alg_name, a->name);
1187 x->ealg->alg_key_len = 0;
1188 if (key) {
1189 x->ealg->alg_key_len = key->sadb_key_bits;
1190 memcpy(x->ealg->alg_key, key+1, keysize);
1191 }
1192 x->props.ealgo = sa->sadb_sa_encrypt;
1193 }
1194 }
1195 /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198 &x->props.saddr);
1199 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1200 &x->id.daddr);
1201
1202 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1203 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1204 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1205 if (mode < 0) {
1206 err = -EINVAL;
1207 goto out;
1208 }
1209 x->props.mode = mode;
1210 x->props.reqid = sa2->sadb_x_sa2_reqid;
1211 }
1212
1213 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1214 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1215
1216 /* Nobody uses this, but we try. */
1217 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1218 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1219 }
1220
1221 if (!x->sel.family)
1222 x->sel.family = x->props.family;
1223
1224 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1225 const struct sadb_x_nat_t_type* n_type;
1226 struct xfrm_encap_tmpl *natt;
1227
1228 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1229 if (!x->encap)
1230 goto out;
1231
1232 natt = x->encap;
1233 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1234 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1235
1236 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1237 const struct sadb_x_nat_t_port *n_port =
1238 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1239 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1240 }
1241 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1242 const struct sadb_x_nat_t_port *n_port =
1243 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1244 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1245 }
1246 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1247 }
1248
1249 err = xfrm_init_state(x);
1250 if (err)
1251 goto out;
1252
1253 x->km.seq = hdr->sadb_msg_seq;
1254 return x;
1255
1256 out:
1257 x->km.state = XFRM_STATE_DEAD;
1258 xfrm_state_put(x);
1259 return ERR_PTR(err);
1260 }
1261
1262 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1263 {
1264 return -EOPNOTSUPP;
1265 }
1266
1267 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1268 {
1269 struct net *net = sock_net(sk);
1270 struct sk_buff *resp_skb;
1271 struct sadb_x_sa2 *sa2;
1272 struct sadb_address *saddr, *daddr;
1273 struct sadb_msg *out_hdr;
1274 struct sadb_spirange *range;
1275 struct xfrm_state *x = NULL;
1276 int mode;
1277 int err;
1278 u32 min_spi, max_spi;
1279 u32 reqid;
1280 u8 proto;
1281 unsigned short family;
1282 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1283
1284 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1285 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1286 return -EINVAL;
1287
1288 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1289 if (proto == 0)
1290 return -EINVAL;
1291
1292 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1293 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1294 if (mode < 0)
1295 return -EINVAL;
1296 reqid = sa2->sadb_x_sa2_reqid;
1297 } else {
1298 mode = 0;
1299 reqid = 0;
1300 }
1301
1302 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1303 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1304
1305 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1306 switch (family) {
1307 case AF_INET:
1308 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1309 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1310 break;
1311 #if IS_ENABLED(CONFIG_IPV6)
1312 case AF_INET6:
1313 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1314 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1315 break;
1316 #endif
1317 }
1318
1319 if (hdr->sadb_msg_seq) {
1320 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1321 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1322 xfrm_state_put(x);
1323 x = NULL;
1324 }
1325 }
1326
1327 if (!x)
1328 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1329
1330 if (x == NULL)
1331 return -ENOENT;
1332
1333 min_spi = 0x100;
1334 max_spi = 0x0fffffff;
1335
1336 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1337 if (range) {
1338 min_spi = range->sadb_spirange_min;
1339 max_spi = range->sadb_spirange_max;
1340 }
1341
1342 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1343 if (err) {
1344 xfrm_state_put(x);
1345 return err;
1346 }
1347
1348 err = xfrm_alloc_spi(x, min_spi, max_spi);
1349 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1350
1351 if (IS_ERR(resp_skb)) {
1352 xfrm_state_put(x);
1353 return PTR_ERR(resp_skb);
1354 }
1355
1356 out_hdr = (struct sadb_msg *) resp_skb->data;
1357 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1358 out_hdr->sadb_msg_type = SADB_GETSPI;
1359 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1360 out_hdr->sadb_msg_errno = 0;
1361 out_hdr->sadb_msg_reserved = 0;
1362 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1363 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1364
1365 xfrm_state_put(x);
1366
1367 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1368
1369 return 0;
1370 }
1371
1372 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1373 {
1374 struct net *net = sock_net(sk);
1375 struct xfrm_state *x;
1376
1377 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1378 return -EOPNOTSUPP;
1379
1380 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1381 return 0;
1382
1383 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1384 if (x == NULL)
1385 return 0;
1386
1387 spin_lock_bh(&x->lock);
1388 if (x->km.state == XFRM_STATE_ACQ)
1389 x->km.state = XFRM_STATE_ERROR;
1390
1391 spin_unlock_bh(&x->lock);
1392 xfrm_state_put(x);
1393 return 0;
1394 }
1395
1396 static inline int event2poltype(int event)
1397 {
1398 switch (event) {
1399 case XFRM_MSG_DELPOLICY:
1400 return SADB_X_SPDDELETE;
1401 case XFRM_MSG_NEWPOLICY:
1402 return SADB_X_SPDADD;
1403 case XFRM_MSG_UPDPOLICY:
1404 return SADB_X_SPDUPDATE;
1405 case XFRM_MSG_POLEXPIRE:
1406 // return SADB_X_SPDEXPIRE;
1407 default:
1408 pr_err("pfkey: Unknown policy event %d\n", event);
1409 break;
1410 }
1411
1412 return 0;
1413 }
1414
1415 static inline int event2keytype(int event)
1416 {
1417 switch (event) {
1418 case XFRM_MSG_DELSA:
1419 return SADB_DELETE;
1420 case XFRM_MSG_NEWSA:
1421 return SADB_ADD;
1422 case XFRM_MSG_UPDSA:
1423 return SADB_UPDATE;
1424 case XFRM_MSG_EXPIRE:
1425 return SADB_EXPIRE;
1426 default:
1427 pr_err("pfkey: Unknown SA event %d\n", event);
1428 break;
1429 }
1430
1431 return 0;
1432 }
1433
1434 /* ADD/UPD/DEL */
1435 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1436 {
1437 struct sk_buff *skb;
1438 struct sadb_msg *hdr;
1439
1440 skb = pfkey_xfrm_state2msg(x);
1441
1442 if (IS_ERR(skb))
1443 return PTR_ERR(skb);
1444
1445 hdr = (struct sadb_msg *) skb->data;
1446 hdr->sadb_msg_version = PF_KEY_V2;
1447 hdr->sadb_msg_type = event2keytype(c->event);
1448 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1449 hdr->sadb_msg_errno = 0;
1450 hdr->sadb_msg_reserved = 0;
1451 hdr->sadb_msg_seq = c->seq;
1452 hdr->sadb_msg_pid = c->portid;
1453
1454 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1455
1456 return 0;
1457 }
1458
1459 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1460 {
1461 struct net *net = sock_net(sk);
1462 struct xfrm_state *x;
1463 int err;
1464 struct km_event c;
1465
1466 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1467 if (IS_ERR(x))
1468 return PTR_ERR(x);
1469
1470 xfrm_state_hold(x);
1471 if (hdr->sadb_msg_type == SADB_ADD)
1472 err = xfrm_state_add(x);
1473 else
1474 err = xfrm_state_update(x);
1475
1476 xfrm_audit_state_add(x, err ? 0 : 1, true);
1477
1478 if (err < 0) {
1479 x->km.state = XFRM_STATE_DEAD;
1480 __xfrm_state_put(x);
1481 goto out;
1482 }
1483
1484 if (hdr->sadb_msg_type == SADB_ADD)
1485 c.event = XFRM_MSG_NEWSA;
1486 else
1487 c.event = XFRM_MSG_UPDSA;
1488 c.seq = hdr->sadb_msg_seq;
1489 c.portid = hdr->sadb_msg_pid;
1490 km_state_notify(x, &c);
1491 out:
1492 xfrm_state_put(x);
1493 return err;
1494 }
1495
1496 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498 struct net *net = sock_net(sk);
1499 struct xfrm_state *x;
1500 struct km_event c;
1501 int err;
1502
1503 if (!ext_hdrs[SADB_EXT_SA-1] ||
1504 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506 return -EINVAL;
1507
1508 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1509 if (x == NULL)
1510 return -ESRCH;
1511
1512 if ((err = security_xfrm_state_delete(x)))
1513 goto out;
1514
1515 if (xfrm_state_kern(x)) {
1516 err = -EPERM;
1517 goto out;
1518 }
1519
1520 err = xfrm_state_delete(x);
1521
1522 if (err < 0)
1523 goto out;
1524
1525 c.seq = hdr->sadb_msg_seq;
1526 c.portid = hdr->sadb_msg_pid;
1527 c.event = XFRM_MSG_DELSA;
1528 km_state_notify(x, &c);
1529 out:
1530 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1531 xfrm_state_put(x);
1532
1533 return err;
1534 }
1535
1536 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1537 {
1538 struct net *net = sock_net(sk);
1539 __u8 proto;
1540 struct sk_buff *out_skb;
1541 struct sadb_msg *out_hdr;
1542 struct xfrm_state *x;
1543
1544 if (!ext_hdrs[SADB_EXT_SA-1] ||
1545 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1546 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1547 return -EINVAL;
1548
1549 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1550 if (x == NULL)
1551 return -ESRCH;
1552
1553 out_skb = pfkey_xfrm_state2msg(x);
1554 proto = x->id.proto;
1555 xfrm_state_put(x);
1556 if (IS_ERR(out_skb))
1557 return PTR_ERR(out_skb);
1558
1559 out_hdr = (struct sadb_msg *) out_skb->data;
1560 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561 out_hdr->sadb_msg_type = SADB_GET;
1562 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1563 out_hdr->sadb_msg_errno = 0;
1564 out_hdr->sadb_msg_reserved = 0;
1565 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1566 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1567 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1568
1569 return 0;
1570 }
1571
1572 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1573 gfp_t allocation)
1574 {
1575 struct sk_buff *skb;
1576 struct sadb_msg *hdr;
1577 int len, auth_len, enc_len, i;
1578
1579 auth_len = xfrm_count_pfkey_auth_supported();
1580 if (auth_len) {
1581 auth_len *= sizeof(struct sadb_alg);
1582 auth_len += sizeof(struct sadb_supported);
1583 }
1584
1585 enc_len = xfrm_count_pfkey_enc_supported();
1586 if (enc_len) {
1587 enc_len *= sizeof(struct sadb_alg);
1588 enc_len += sizeof(struct sadb_supported);
1589 }
1590
1591 len = enc_len + auth_len + sizeof(struct sadb_msg);
1592
1593 skb = alloc_skb(len + 16, allocation);
1594 if (!skb)
1595 goto out_put_algs;
1596
1597 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1598 pfkey_hdr_dup(hdr, orig);
1599 hdr->sadb_msg_errno = 0;
1600 hdr->sadb_msg_len = len / sizeof(uint64_t);
1601
1602 if (auth_len) {
1603 struct sadb_supported *sp;
1604 struct sadb_alg *ap;
1605
1606 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1607 ap = (struct sadb_alg *) (sp + 1);
1608
1609 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1610 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1611
1612 for (i = 0; ; i++) {
1613 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1614 if (!aalg)
1615 break;
1616 if (!aalg->pfkey_supported)
1617 continue;
1618 if (aalg->available)
1619 *ap++ = aalg->desc;
1620 }
1621 }
1622
1623 if (enc_len) {
1624 struct sadb_supported *sp;
1625 struct sadb_alg *ap;
1626
1627 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628 ap = (struct sadb_alg *) (sp + 1);
1629
1630 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632
1633 for (i = 0; ; i++) {
1634 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635 if (!ealg)
1636 break;
1637 if (!ealg->pfkey_supported)
1638 continue;
1639 if (ealg->available)
1640 *ap++ = ealg->desc;
1641 }
1642 }
1643
1644 out_put_algs:
1645 return skb;
1646 }
1647
1648 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1649 {
1650 struct pfkey_sock *pfk = pfkey_sk(sk);
1651 struct sk_buff *supp_skb;
1652
1653 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1654 return -EINVAL;
1655
1656 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1657 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1658 return -EEXIST;
1659 pfk->registered |= (1<<hdr->sadb_msg_satype);
1660 }
1661
1662 xfrm_probe_algs();
1663
1664 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1665 if (!supp_skb) {
1666 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1667 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1668
1669 return -ENOBUFS;
1670 }
1671
1672 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1673
1674 return 0;
1675 }
1676
1677 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1678 {
1679 struct sk_buff *skb;
1680 struct sadb_msg *hdr;
1681
1682 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1683 if (!skb)
1684 return -ENOBUFS;
1685
1686 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1687 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1688 hdr->sadb_msg_errno = (uint8_t) 0;
1689 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1690
1691 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1692 }
1693
1694 static int key_notify_sa_flush(const struct km_event *c)
1695 {
1696 struct sk_buff *skb;
1697 struct sadb_msg *hdr;
1698
1699 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1700 if (!skb)
1701 return -ENOBUFS;
1702 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1703 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1704 hdr->sadb_msg_type = SADB_FLUSH;
1705 hdr->sadb_msg_seq = c->seq;
1706 hdr->sadb_msg_pid = c->portid;
1707 hdr->sadb_msg_version = PF_KEY_V2;
1708 hdr->sadb_msg_errno = (uint8_t) 0;
1709 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1710 hdr->sadb_msg_reserved = 0;
1711
1712 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1713
1714 return 0;
1715 }
1716
1717 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1718 {
1719 struct net *net = sock_net(sk);
1720 unsigned int proto;
1721 struct km_event c;
1722 int err, err2;
1723
1724 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1725 if (proto == 0)
1726 return -EINVAL;
1727
1728 err = xfrm_state_flush(net, proto, true);
1729 err2 = unicast_flush_resp(sk, hdr);
1730 if (err || err2) {
1731 if (err == -ESRCH) /* empty table - go quietly */
1732 err = 0;
1733 return err ? err : err2;
1734 }
1735
1736 c.data.proto = proto;
1737 c.seq = hdr->sadb_msg_seq;
1738 c.portid = hdr->sadb_msg_pid;
1739 c.event = XFRM_MSG_FLUSHSA;
1740 c.net = net;
1741 km_state_notify(NULL, &c);
1742
1743 return 0;
1744 }
1745
1746 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1747 {
1748 struct pfkey_sock *pfk = ptr;
1749 struct sk_buff *out_skb;
1750 struct sadb_msg *out_hdr;
1751
1752 if (!pfkey_can_dump(&pfk->sk))
1753 return -ENOBUFS;
1754
1755 out_skb = pfkey_xfrm_state2msg(x);
1756 if (IS_ERR(out_skb))
1757 return PTR_ERR(out_skb);
1758
1759 out_hdr = (struct sadb_msg *) out_skb->data;
1760 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1761 out_hdr->sadb_msg_type = SADB_DUMP;
1762 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1763 out_hdr->sadb_msg_errno = 0;
1764 out_hdr->sadb_msg_reserved = 0;
1765 out_hdr->sadb_msg_seq = count + 1;
1766 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1767
1768 if (pfk->dump.skb)
1769 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1770 &pfk->sk, sock_net(&pfk->sk));
1771 pfk->dump.skb = out_skb;
1772
1773 return 0;
1774 }
1775
1776 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1777 {
1778 struct net *net = sock_net(&pfk->sk);
1779 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1780 }
1781
1782 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1783 {
1784 struct net *net = sock_net(&pfk->sk);
1785
1786 xfrm_state_walk_done(&pfk->dump.u.state, net);
1787 }
1788
1789 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1790 {
1791 u8 proto;
1792 struct xfrm_address_filter *filter = NULL;
1793 struct pfkey_sock *pfk = pfkey_sk(sk);
1794
1795 if (pfk->dump.dump != NULL)
1796 return -EBUSY;
1797
1798 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1799 if (proto == 0)
1800 return -EINVAL;
1801
1802 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1803 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1804
1805 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1806 if (filter == NULL)
1807 return -ENOMEM;
1808
1809 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1810 sizeof(xfrm_address_t));
1811 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1812 sizeof(xfrm_address_t));
1813 filter->family = xfilter->sadb_x_filter_family;
1814 filter->splen = xfilter->sadb_x_filter_splen;
1815 filter->dplen = xfilter->sadb_x_filter_dplen;
1816 }
1817
1818 pfk->dump.msg_version = hdr->sadb_msg_version;
1819 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1820 pfk->dump.dump = pfkey_dump_sa;
1821 pfk->dump.done = pfkey_dump_sa_done;
1822 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1823
1824 return pfkey_do_dump(pfk);
1825 }
1826
1827 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1828 {
1829 struct pfkey_sock *pfk = pfkey_sk(sk);
1830 int satype = hdr->sadb_msg_satype;
1831 bool reset_errno = false;
1832
1833 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1834 reset_errno = true;
1835 if (satype != 0 && satype != 1)
1836 return -EINVAL;
1837 pfk->promisc = satype;
1838 }
1839 if (reset_errno && skb_cloned(skb))
1840 skb = skb_copy(skb, GFP_KERNEL);
1841 else
1842 skb = skb_clone(skb, GFP_KERNEL);
1843
1844 if (reset_errno && skb) {
1845 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1846 new_hdr->sadb_msg_errno = 0;
1847 }
1848
1849 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1850 return 0;
1851 }
1852
1853 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1854 {
1855 int i;
1856 u32 reqid = *(u32*)ptr;
1857
1858 for (i=0; i<xp->xfrm_nr; i++) {
1859 if (xp->xfrm_vec[i].reqid == reqid)
1860 return -EEXIST;
1861 }
1862 return 0;
1863 }
1864
1865 static u32 gen_reqid(struct net *net)
1866 {
1867 struct xfrm_policy_walk walk;
1868 u32 start;
1869 int rc;
1870 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1871
1872 start = reqid;
1873 do {
1874 ++reqid;
1875 if (reqid == 0)
1876 reqid = IPSEC_MANUAL_REQID_MAX+1;
1877 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1878 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1879 xfrm_policy_walk_done(&walk, net);
1880 if (rc != -EEXIST)
1881 return reqid;
1882 } while (reqid != start);
1883 return 0;
1884 }
1885
1886 static int
1887 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1888 {
1889 struct net *net = xp_net(xp);
1890 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1891 int mode;
1892
1893 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1894 return -ELOOP;
1895
1896 if (rq->sadb_x_ipsecrequest_mode == 0)
1897 return -EINVAL;
1898
1899 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1900 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1901 return -EINVAL;
1902 t->mode = mode;
1903 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1904 t->optional = 1;
1905 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1906 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1907 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1908 t->reqid = 0;
1909 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1910 return -ENOBUFS;
1911 }
1912
1913 /* addresses present only in tunnel mode */
1914 if (t->mode == XFRM_MODE_TUNNEL) {
1915 u8 *sa = (u8 *) (rq + 1);
1916 int family, socklen;
1917
1918 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1919 &t->saddr);
1920 if (!family)
1921 return -EINVAL;
1922
1923 socklen = pfkey_sockaddr_len(family);
1924 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1925 &t->id.daddr) != family)
1926 return -EINVAL;
1927 t->encap_family = family;
1928 } else
1929 t->encap_family = xp->family;
1930
1931 /* No way to set this via kame pfkey */
1932 t->allalgs = 1;
1933 xp->xfrm_nr++;
1934 return 0;
1935 }
1936
1937 static int
1938 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1939 {
1940 int err;
1941 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1942 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1943
1944 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1945 return -EINVAL;
1946
1947 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1948 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1949 return err;
1950 len -= rq->sadb_x_ipsecrequest_len;
1951 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1952 }
1953 return 0;
1954 }
1955
1956 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1957 {
1958 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1959
1960 if (xfrm_ctx) {
1961 int len = sizeof(struct sadb_x_sec_ctx);
1962 len += xfrm_ctx->ctx_len;
1963 return PFKEY_ALIGN8(len);
1964 }
1965 return 0;
1966 }
1967
1968 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1969 {
1970 const struct xfrm_tmpl *t;
1971 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1972 int socklen = 0;
1973 int i;
1974
1975 for (i=0; i<xp->xfrm_nr; i++) {
1976 t = xp->xfrm_vec + i;
1977 socklen += pfkey_sockaddr_len(t->encap_family);
1978 }
1979
1980 return sizeof(struct sadb_msg) +
1981 (sizeof(struct sadb_lifetime) * 3) +
1982 (sizeof(struct sadb_address) * 2) +
1983 (sockaddr_size * 2) +
1984 sizeof(struct sadb_x_policy) +
1985 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1986 (socklen * 2) +
1987 pfkey_xfrm_policy2sec_ctx_size(xp);
1988 }
1989
1990 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1991 {
1992 struct sk_buff *skb;
1993 int size;
1994
1995 size = pfkey_xfrm_policy2msg_size(xp);
1996
1997 skb = alloc_skb(size + 16, GFP_ATOMIC);
1998 if (skb == NULL)
1999 return ERR_PTR(-ENOBUFS);
2000
2001 return skb;
2002 }
2003
2004 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2005 {
2006 struct sadb_msg *hdr;
2007 struct sadb_address *addr;
2008 struct sadb_lifetime *lifetime;
2009 struct sadb_x_policy *pol;
2010 struct sadb_x_sec_ctx *sec_ctx;
2011 struct xfrm_sec_ctx *xfrm_ctx;
2012 int i;
2013 int size;
2014 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2015 int socklen = pfkey_sockaddr_len(xp->family);
2016
2017 size = pfkey_xfrm_policy2msg_size(xp);
2018
2019 /* call should fill header later */
2020 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2021 memset(hdr, 0, size); /* XXX do we need this ? */
2022
2023 /* src address */
2024 addr = (struct sadb_address*) skb_put(skb,
2025 sizeof(struct sadb_address)+sockaddr_size);
2026 addr->sadb_address_len =
2027 (sizeof(struct sadb_address)+sockaddr_size)/
2028 sizeof(uint64_t);
2029 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2030 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2031 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2032 addr->sadb_address_reserved = 0;
2033 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2034 xp->selector.sport,
2035 (struct sockaddr *) (addr + 1),
2036 xp->family))
2037 BUG();
2038
2039 /* dst address */
2040 addr = (struct sadb_address*) skb_put(skb,
2041 sizeof(struct sadb_address)+sockaddr_size);
2042 addr->sadb_address_len =
2043 (sizeof(struct sadb_address)+sockaddr_size)/
2044 sizeof(uint64_t);
2045 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2046 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2047 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2048 addr->sadb_address_reserved = 0;
2049
2050 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2051 (struct sockaddr *) (addr + 1),
2052 xp->family);
2053
2054 /* hard time */
2055 lifetime = (struct sadb_lifetime *) skb_put(skb,
2056 sizeof(struct sadb_lifetime));
2057 lifetime->sadb_lifetime_len =
2058 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2059 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2060 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2061 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2062 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2063 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2064 /* soft time */
2065 lifetime = (struct sadb_lifetime *) skb_put(skb,
2066 sizeof(struct sadb_lifetime));
2067 lifetime->sadb_lifetime_len =
2068 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2069 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2070 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2071 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2072 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2073 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2074 /* current time */
2075 lifetime = (struct sadb_lifetime *) skb_put(skb,
2076 sizeof(struct sadb_lifetime));
2077 lifetime->sadb_lifetime_len =
2078 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2079 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2080 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2081 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2082 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2083 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2084
2085 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2086 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2087 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2088 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2089 if (xp->action == XFRM_POLICY_ALLOW) {
2090 if (xp->xfrm_nr)
2091 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2092 else
2093 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2094 }
2095 pol->sadb_x_policy_dir = dir+1;
2096 pol->sadb_x_policy_reserved = 0;
2097 pol->sadb_x_policy_id = xp->index;
2098 pol->sadb_x_policy_priority = xp->priority;
2099
2100 for (i=0; i<xp->xfrm_nr; i++) {
2101 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2102 struct sadb_x_ipsecrequest *rq;
2103 int req_size;
2104 int mode;
2105
2106 req_size = sizeof(struct sadb_x_ipsecrequest);
2107 if (t->mode == XFRM_MODE_TUNNEL) {
2108 socklen = pfkey_sockaddr_len(t->encap_family);
2109 req_size += socklen * 2;
2110 } else {
2111 size -= 2*socklen;
2112 }
2113 rq = (void*)skb_put(skb, req_size);
2114 pol->sadb_x_policy_len += req_size/8;
2115 memset(rq, 0, sizeof(*rq));
2116 rq->sadb_x_ipsecrequest_len = req_size;
2117 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2118 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2119 return -EINVAL;
2120 rq->sadb_x_ipsecrequest_mode = mode;
2121 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2122 if (t->reqid)
2123 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2124 if (t->optional)
2125 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2126 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2127
2128 if (t->mode == XFRM_MODE_TUNNEL) {
2129 u8 *sa = (void *)(rq + 1);
2130 pfkey_sockaddr_fill(&t->saddr, 0,
2131 (struct sockaddr *)sa,
2132 t->encap_family);
2133 pfkey_sockaddr_fill(&t->id.daddr, 0,
2134 (struct sockaddr *) (sa + socklen),
2135 t->encap_family);
2136 }
2137 }
2138
2139 /* security context */
2140 if ((xfrm_ctx = xp->security)) {
2141 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2142
2143 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2144 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2145 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2146 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2147 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2148 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2149 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2150 xfrm_ctx->ctx_len);
2151 }
2152
2153 hdr->sadb_msg_len = size / sizeof(uint64_t);
2154 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2155
2156 return 0;
2157 }
2158
2159 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2160 {
2161 struct sk_buff *out_skb;
2162 struct sadb_msg *out_hdr;
2163 int err;
2164
2165 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2166 if (IS_ERR(out_skb))
2167 return PTR_ERR(out_skb);
2168
2169 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2170 if (err < 0)
2171 return err;
2172
2173 out_hdr = (struct sadb_msg *) out_skb->data;
2174 out_hdr->sadb_msg_version = PF_KEY_V2;
2175
2176 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2177 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2178 else
2179 out_hdr->sadb_msg_type = event2poltype(c->event);
2180 out_hdr->sadb_msg_errno = 0;
2181 out_hdr->sadb_msg_seq = c->seq;
2182 out_hdr->sadb_msg_pid = c->portid;
2183 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2184 return 0;
2185
2186 }
2187
2188 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2189 {
2190 struct net *net = sock_net(sk);
2191 int err = 0;
2192 struct sadb_lifetime *lifetime;
2193 struct sadb_address *sa;
2194 struct sadb_x_policy *pol;
2195 struct xfrm_policy *xp;
2196 struct km_event c;
2197 struct sadb_x_sec_ctx *sec_ctx;
2198
2199 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2200 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2201 !ext_hdrs[SADB_X_EXT_POLICY-1])
2202 return -EINVAL;
2203
2204 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2205 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2206 return -EINVAL;
2207 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2208 return -EINVAL;
2209
2210 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2211 if (xp == NULL)
2212 return -ENOBUFS;
2213
2214 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2215 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2216 xp->priority = pol->sadb_x_policy_priority;
2217
2218 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2219 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2220 xp->selector.family = xp->family;
2221 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2222 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2223 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2224 if (xp->selector.sport)
2225 xp->selector.sport_mask = htons(0xffff);
2226
2227 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2228 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2229 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2230
2231 /* Amusing, we set this twice. KAME apps appear to set same value
2232 * in both addresses.
2233 */
2234 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2235
2236 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2237 if (xp->selector.dport)
2238 xp->selector.dport_mask = htons(0xffff);
2239
2240 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2241 if (sec_ctx != NULL) {
2242 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2243
2244 if (!uctx) {
2245 err = -ENOBUFS;
2246 goto out;
2247 }
2248
2249 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2250 kfree(uctx);
2251
2252 if (err)
2253 goto out;
2254 }
2255
2256 xp->lft.soft_byte_limit = XFRM_INF;
2257 xp->lft.hard_byte_limit = XFRM_INF;
2258 xp->lft.soft_packet_limit = XFRM_INF;
2259 xp->lft.hard_packet_limit = XFRM_INF;
2260 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2261 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2262 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2263 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2264 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2265 }
2266 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2267 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2268 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2269 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2270 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2271 }
2272 xp->xfrm_nr = 0;
2273 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2274 (err = parse_ipsecrequests(xp, pol)) < 0)
2275 goto out;
2276
2277 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2278 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2279
2280 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2281
2282 if (err)
2283 goto out;
2284
2285 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2286 c.event = XFRM_MSG_UPDPOLICY;
2287 else
2288 c.event = XFRM_MSG_NEWPOLICY;
2289
2290 c.seq = hdr->sadb_msg_seq;
2291 c.portid = hdr->sadb_msg_pid;
2292
2293 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2294 xfrm_pol_put(xp);
2295 return 0;
2296
2297 out:
2298 xp->walk.dead = 1;
2299 xfrm_policy_destroy(xp);
2300 return err;
2301 }
2302
2303 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2304 {
2305 struct net *net = sock_net(sk);
2306 int err;
2307 struct sadb_address *sa;
2308 struct sadb_x_policy *pol;
2309 struct xfrm_policy *xp;
2310 struct xfrm_selector sel;
2311 struct km_event c;
2312 struct sadb_x_sec_ctx *sec_ctx;
2313 struct xfrm_sec_ctx *pol_ctx = NULL;
2314
2315 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2316 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2317 !ext_hdrs[SADB_X_EXT_POLICY-1])
2318 return -EINVAL;
2319
2320 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2321 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2322 return -EINVAL;
2323
2324 memset(&sel, 0, sizeof(sel));
2325
2326 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2327 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2328 sel.prefixlen_s = sa->sadb_address_prefixlen;
2329 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2330 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2331 if (sel.sport)
2332 sel.sport_mask = htons(0xffff);
2333
2334 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2335 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2336 sel.prefixlen_d = sa->sadb_address_prefixlen;
2337 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2338 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2339 if (sel.dport)
2340 sel.dport_mask = htons(0xffff);
2341
2342 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2343 if (sec_ctx != NULL) {
2344 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2345
2346 if (!uctx)
2347 return -ENOMEM;
2348
2349 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2350 kfree(uctx);
2351 if (err)
2352 return err;
2353 }
2354
2355 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2356 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2357 1, &err);
2358 security_xfrm_policy_free(pol_ctx);
2359 if (xp == NULL)
2360 return -ENOENT;
2361
2362 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2363
2364 if (err)
2365 goto out;
2366
2367 c.seq = hdr->sadb_msg_seq;
2368 c.portid = hdr->sadb_msg_pid;
2369 c.data.byid = 0;
2370 c.event = XFRM_MSG_DELPOLICY;
2371 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2372
2373 out:
2374 xfrm_pol_put(xp);
2375 if (err == 0)
2376 xfrm_garbage_collect(net);
2377 return err;
2378 }
2379
2380 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2381 {
2382 int err;
2383 struct sk_buff *out_skb;
2384 struct sadb_msg *out_hdr;
2385 err = 0;
2386
2387 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2388 if (IS_ERR(out_skb)) {
2389 err = PTR_ERR(out_skb);
2390 goto out;
2391 }
2392 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2393 if (err < 0)
2394 goto out;
2395
2396 out_hdr = (struct sadb_msg *) out_skb->data;
2397 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2398 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2399 out_hdr->sadb_msg_satype = 0;
2400 out_hdr->sadb_msg_errno = 0;
2401 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2402 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2403 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2404 err = 0;
2405
2406 out:
2407 return err;
2408 }
2409
2410 #ifdef CONFIG_NET_KEY_MIGRATE
2411 static int pfkey_sockaddr_pair_size(sa_family_t family)
2412 {
2413 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2414 }
2415
2416 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2417 xfrm_address_t *saddr, xfrm_address_t *daddr,
2418 u16 *family)
2419 {
2420 int af, socklen;
2421
2422 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2423 return -EINVAL;
2424
2425 af = pfkey_sockaddr_extract(sa, saddr);
2426 if (!af)
2427 return -EINVAL;
2428
2429 socklen = pfkey_sockaddr_len(af);
2430 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2431 daddr) != af)
2432 return -EINVAL;
2433
2434 *family = af;
2435 return 0;
2436 }
2437
2438 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2439 struct xfrm_migrate *m)
2440 {
2441 int err;
2442 struct sadb_x_ipsecrequest *rq2;
2443 int mode;
2444
2445 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2446 len < rq1->sadb_x_ipsecrequest_len)
2447 return -EINVAL;
2448
2449 /* old endoints */
2450 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2451 rq1->sadb_x_ipsecrequest_len,
2452 &m->old_saddr, &m->old_daddr,
2453 &m->old_family);
2454 if (err)
2455 return err;
2456
2457 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2458 len -= rq1->sadb_x_ipsecrequest_len;
2459
2460 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2461 len < rq2->sadb_x_ipsecrequest_len)
2462 return -EINVAL;
2463
2464 /* new endpoints */
2465 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2466 rq2->sadb_x_ipsecrequest_len,
2467 &m->new_saddr, &m->new_daddr,
2468 &m->new_family);
2469 if (err)
2470 return err;
2471
2472 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2473 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2474 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2475 return -EINVAL;
2476
2477 m->proto = rq1->sadb_x_ipsecrequest_proto;
2478 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2479 return -EINVAL;
2480 m->mode = mode;
2481 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2482
2483 return ((int)(rq1->sadb_x_ipsecrequest_len +
2484 rq2->sadb_x_ipsecrequest_len));
2485 }
2486
2487 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2488 const struct sadb_msg *hdr, void * const *ext_hdrs)
2489 {
2490 int i, len, ret, err = -EINVAL;
2491 u8 dir;
2492 struct sadb_address *sa;
2493 struct sadb_x_kmaddress *kma;
2494 struct sadb_x_policy *pol;
2495 struct sadb_x_ipsecrequest *rq;
2496 struct xfrm_selector sel;
2497 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2498 struct xfrm_kmaddress k;
2499 struct net *net = sock_net(sk);
2500
2501 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2502 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2503 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2504 err = -EINVAL;
2505 goto out;
2506 }
2507
2508 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2509 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2510
2511 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2512 err = -EINVAL;
2513 goto out;
2514 }
2515
2516 if (kma) {
2517 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2518 k.reserved = kma->sadb_x_kmaddress_reserved;
2519 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2520 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2521 &k.local, &k.remote, &k.family);
2522 if (ret < 0) {
2523 err = ret;
2524 goto out;
2525 }
2526 }
2527
2528 dir = pol->sadb_x_policy_dir - 1;
2529 memset(&sel, 0, sizeof(sel));
2530
2531 /* set source address info of selector */
2532 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2533 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2534 sel.prefixlen_s = sa->sadb_address_prefixlen;
2535 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2536 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2537 if (sel.sport)
2538 sel.sport_mask = htons(0xffff);
2539
2540 /* set destination address info of selector */
2541 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2542 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2543 sel.prefixlen_d = sa->sadb_address_prefixlen;
2544 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2545 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2546 if (sel.dport)
2547 sel.dport_mask = htons(0xffff);
2548
2549 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2550
2551 /* extract ipsecrequests */
2552 i = 0;
2553 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2554
2555 while (len > 0 && i < XFRM_MAX_DEPTH) {
2556 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2557 if (ret < 0) {
2558 err = ret;
2559 goto out;
2560 } else {
2561 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2562 len -= ret;
2563 i++;
2564 }
2565 }
2566
2567 if (!i || len > 0) {
2568 err = -EINVAL;
2569 goto out;
2570 }
2571
2572 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2573 kma ? &k : NULL, net);
2574
2575 out:
2576 return err;
2577 }
2578 #else
2579 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2580 const struct sadb_msg *hdr, void * const *ext_hdrs)
2581 {
2582 return -ENOPROTOOPT;
2583 }
2584 #endif
2585
2586
2587 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2588 {
2589 struct net *net = sock_net(sk);
2590 unsigned int dir;
2591 int err = 0, delete;
2592 struct sadb_x_policy *pol;
2593 struct xfrm_policy *xp;
2594 struct km_event c;
2595
2596 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2597 return -EINVAL;
2598
2599 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2600 if (dir >= XFRM_POLICY_MAX)
2601 return -EINVAL;
2602
2603 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2604 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2605 dir, pol->sadb_x_policy_id, delete, &err);
2606 if (xp == NULL)
2607 return -ENOENT;
2608
2609 if (delete) {
2610 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2611
2612 if (err)
2613 goto out;
2614 c.seq = hdr->sadb_msg_seq;
2615 c.portid = hdr->sadb_msg_pid;
2616 c.data.byid = 1;
2617 c.event = XFRM_MSG_DELPOLICY;
2618 km_policy_notify(xp, dir, &c);
2619 } else {
2620 err = key_pol_get_resp(sk, xp, hdr, dir);
2621 }
2622
2623 out:
2624 xfrm_pol_put(xp);
2625 if (delete && err == 0)
2626 xfrm_garbage_collect(net);
2627 return err;
2628 }
2629
2630 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2631 {
2632 struct pfkey_sock *pfk = ptr;
2633 struct sk_buff *out_skb;
2634 struct sadb_msg *out_hdr;
2635 int err;
2636
2637 if (!pfkey_can_dump(&pfk->sk))
2638 return -ENOBUFS;
2639
2640 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2641 if (IS_ERR(out_skb))
2642 return PTR_ERR(out_skb);
2643
2644 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2645 if (err < 0)
2646 return err;
2647
2648 out_hdr = (struct sadb_msg *) out_skb->data;
2649 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2650 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2651 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2652 out_hdr->sadb_msg_errno = 0;
2653 out_hdr->sadb_msg_seq = count + 1;
2654 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2655
2656 if (pfk->dump.skb)
2657 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2658 &pfk->sk, sock_net(&pfk->sk));
2659 pfk->dump.skb = out_skb;
2660
2661 return 0;
2662 }
2663
2664 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2665 {
2666 struct net *net = sock_net(&pfk->sk);
2667 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2668 }
2669
2670 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2671 {
2672 struct net *net = sock_net((struct sock *)pfk);
2673
2674 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2675 }
2676
2677 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2678 {
2679 struct pfkey_sock *pfk = pfkey_sk(sk);
2680
2681 if (pfk->dump.dump != NULL)
2682 return -EBUSY;
2683
2684 pfk->dump.msg_version = hdr->sadb_msg_version;
2685 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2686 pfk->dump.dump = pfkey_dump_sp;
2687 pfk->dump.done = pfkey_dump_sp_done;
2688 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2689
2690 return pfkey_do_dump(pfk);
2691 }
2692
2693 static int key_notify_policy_flush(const struct km_event *c)
2694 {
2695 struct sk_buff *skb_out;
2696 struct sadb_msg *hdr;
2697
2698 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2699 if (!skb_out)
2700 return -ENOBUFS;
2701 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2702 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2703 hdr->sadb_msg_seq = c->seq;
2704 hdr->sadb_msg_pid = c->portid;
2705 hdr->sadb_msg_version = PF_KEY_V2;
2706 hdr->sadb_msg_errno = (uint8_t) 0;
2707 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2708 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2709 hdr->sadb_msg_reserved = 0;
2710 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2711 return 0;
2712
2713 }
2714
2715 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2716 {
2717 struct net *net = sock_net(sk);
2718 struct km_event c;
2719 int err, err2;
2720
2721 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2722 err2 = unicast_flush_resp(sk, hdr);
2723 if (err || err2) {
2724 if (err == -ESRCH) /* empty table - old silent behavior */
2725 return 0;
2726 return err;
2727 }
2728
2729 c.data.type = XFRM_POLICY_TYPE_MAIN;
2730 c.event = XFRM_MSG_FLUSHPOLICY;
2731 c.portid = hdr->sadb_msg_pid;
2732 c.seq = hdr->sadb_msg_seq;
2733 c.net = net;
2734 km_policy_notify(NULL, 0, &c);
2735
2736 return 0;
2737 }
2738
2739 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2740 const struct sadb_msg *hdr, void * const *ext_hdrs);
2741 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2742 [SADB_RESERVED] = pfkey_reserved,
2743 [SADB_GETSPI] = pfkey_getspi,
2744 [SADB_UPDATE] = pfkey_add,
2745 [SADB_ADD] = pfkey_add,
2746 [SADB_DELETE] = pfkey_delete,
2747 [SADB_GET] = pfkey_get,
2748 [SADB_ACQUIRE] = pfkey_acquire,
2749 [SADB_REGISTER] = pfkey_register,
2750 [SADB_EXPIRE] = NULL,
2751 [SADB_FLUSH] = pfkey_flush,
2752 [SADB_DUMP] = pfkey_dump,
2753 [SADB_X_PROMISC] = pfkey_promisc,
2754 [SADB_X_PCHANGE] = NULL,
2755 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2756 [SADB_X_SPDADD] = pfkey_spdadd,
2757 [SADB_X_SPDDELETE] = pfkey_spddelete,
2758 [SADB_X_SPDGET] = pfkey_spdget,
2759 [SADB_X_SPDACQUIRE] = NULL,
2760 [SADB_X_SPDDUMP] = pfkey_spddump,
2761 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2762 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2763 [SADB_X_SPDDELETE2] = pfkey_spdget,
2764 [SADB_X_MIGRATE] = pfkey_migrate,
2765 };
2766
2767 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2768 {
2769 void *ext_hdrs[SADB_EXT_MAX];
2770 int err;
2771
2772 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2773 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2774
2775 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2776 err = parse_exthdrs(skb, hdr, ext_hdrs);
2777 if (!err) {
2778 err = -EOPNOTSUPP;
2779 if (pfkey_funcs[hdr->sadb_msg_type])
2780 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2781 }
2782 return err;
2783 }
2784
2785 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2786 {
2787 struct sadb_msg *hdr = NULL;
2788
2789 if (skb->len < sizeof(*hdr)) {
2790 *errp = -EMSGSIZE;
2791 } else {
2792 hdr = (struct sadb_msg *) skb->data;
2793 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2794 hdr->sadb_msg_reserved != 0 ||
2795 (hdr->sadb_msg_type <= SADB_RESERVED ||
2796 hdr->sadb_msg_type > SADB_MAX)) {
2797 hdr = NULL;
2798 *errp = -EINVAL;
2799 } else if (hdr->sadb_msg_len != (skb->len /
2800 sizeof(uint64_t)) ||
2801 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2802 sizeof(uint64_t))) {
2803 hdr = NULL;
2804 *errp = -EMSGSIZE;
2805 } else {
2806 *errp = 0;
2807 }
2808 }
2809 return hdr;
2810 }
2811
2812 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2813 const struct xfrm_algo_desc *d)
2814 {
2815 unsigned int id = d->desc.sadb_alg_id;
2816
2817 if (id >= sizeof(t->aalgos) * 8)
2818 return 0;
2819
2820 return (t->aalgos >> id) & 1;
2821 }
2822
2823 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2824 const struct xfrm_algo_desc *d)
2825 {
2826 unsigned int id = d->desc.sadb_alg_id;
2827
2828 if (id >= sizeof(t->ealgos) * 8)
2829 return 0;
2830
2831 return (t->ealgos >> id) & 1;
2832 }
2833
2834 static int count_ah_combs(const struct xfrm_tmpl *t)
2835 {
2836 int i, sz = 0;
2837
2838 for (i = 0; ; i++) {
2839 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2840 if (!aalg)
2841 break;
2842 if (!aalg->pfkey_supported)
2843 continue;
2844 if (aalg_tmpl_set(t, aalg) && aalg->available)
2845 sz += sizeof(struct sadb_comb);
2846 }
2847 return sz + sizeof(struct sadb_prop);
2848 }
2849
2850 static int count_esp_combs(const struct xfrm_tmpl *t)
2851 {
2852 int i, k, sz = 0;
2853
2854 for (i = 0; ; i++) {
2855 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2856 if (!ealg)
2857 break;
2858
2859 if (!ealg->pfkey_supported)
2860 continue;
2861
2862 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2863 continue;
2864
2865 for (k = 1; ; k++) {
2866 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2867 if (!aalg)
2868 break;
2869
2870 if (!aalg->pfkey_supported)
2871 continue;
2872
2873 if (aalg_tmpl_set(t, aalg) && aalg->available)
2874 sz += sizeof(struct sadb_comb);
2875 }
2876 }
2877 return sz + sizeof(struct sadb_prop);
2878 }
2879
2880 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2881 {
2882 struct sadb_prop *p;
2883 int i;
2884
2885 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2886 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2887 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2888 p->sadb_prop_replay = 32;
2889 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2890
2891 for (i = 0; ; i++) {
2892 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2893 if (!aalg)
2894 break;
2895
2896 if (!aalg->pfkey_supported)
2897 continue;
2898
2899 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2900 struct sadb_comb *c;
2901 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2902 memset(c, 0, sizeof(*c));
2903 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2904 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2905 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2906 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2907 c->sadb_comb_hard_addtime = 24*60*60;
2908 c->sadb_comb_soft_addtime = 20*60*60;
2909 c->sadb_comb_hard_usetime = 8*60*60;
2910 c->sadb_comb_soft_usetime = 7*60*60;
2911 }
2912 }
2913 }
2914
2915 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2916 {
2917 struct sadb_prop *p;
2918 int i, k;
2919
2920 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2921 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2922 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2923 p->sadb_prop_replay = 32;
2924 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2925
2926 for (i=0; ; i++) {
2927 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2928 if (!ealg)
2929 break;
2930
2931 if (!ealg->pfkey_supported)
2932 continue;
2933
2934 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2935 continue;
2936
2937 for (k = 1; ; k++) {
2938 struct sadb_comb *c;
2939 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2940 if (!aalg)
2941 break;
2942 if (!aalg->pfkey_supported)
2943 continue;
2944 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2945 continue;
2946 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2947 memset(c, 0, sizeof(*c));
2948 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2949 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2950 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2951 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2952 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2953 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2954 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2955 c->sadb_comb_hard_addtime = 24*60*60;
2956 c->sadb_comb_soft_addtime = 20*60*60;
2957 c->sadb_comb_hard_usetime = 8*60*60;
2958 c->sadb_comb_soft_usetime = 7*60*60;
2959 }
2960 }
2961 }
2962
2963 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2964 {
2965 return 0;
2966 }
2967
2968 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2969 {
2970 struct sk_buff *out_skb;
2971 struct sadb_msg *out_hdr;
2972 int hard;
2973 int hsc;
2974
2975 hard = c->data.hard;
2976 if (hard)
2977 hsc = 2;
2978 else
2979 hsc = 1;
2980
2981 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2982 if (IS_ERR(out_skb))
2983 return PTR_ERR(out_skb);
2984
2985 out_hdr = (struct sadb_msg *) out_skb->data;
2986 out_hdr->sadb_msg_version = PF_KEY_V2;
2987 out_hdr->sadb_msg_type = SADB_EXPIRE;
2988 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2989 out_hdr->sadb_msg_errno = 0;
2990 out_hdr->sadb_msg_reserved = 0;
2991 out_hdr->sadb_msg_seq = 0;
2992 out_hdr->sadb_msg_pid = 0;
2993
2994 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2995 return 0;
2996 }
2997
2998 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2999 {
3000 struct net *net = x ? xs_net(x) : c->net;
3001 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3002
3003 if (atomic_read(&net_pfkey->socks_nr) == 0)
3004 return 0;
3005
3006 switch (c->event) {
3007 case XFRM_MSG_EXPIRE:
3008 return key_notify_sa_expire(x, c);
3009 case XFRM_MSG_DELSA:
3010 case XFRM_MSG_NEWSA:
3011 case XFRM_MSG_UPDSA:
3012 return key_notify_sa(x, c);
3013 case XFRM_MSG_FLUSHSA:
3014 return key_notify_sa_flush(c);
3015 case XFRM_MSG_NEWAE: /* not yet supported */
3016 break;
3017 default:
3018 pr_err("pfkey: Unknown SA event %d\n", c->event);
3019 break;
3020 }
3021
3022 return 0;
3023 }
3024
3025 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3026 {
3027 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3028 return 0;
3029
3030 switch (c->event) {
3031 case XFRM_MSG_POLEXPIRE:
3032 return key_notify_policy_expire(xp, c);
3033 case XFRM_MSG_DELPOLICY:
3034 case XFRM_MSG_NEWPOLICY:
3035 case XFRM_MSG_UPDPOLICY:
3036 return key_notify_policy(xp, dir, c);
3037 case XFRM_MSG_FLUSHPOLICY:
3038 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3039 break;
3040 return key_notify_policy_flush(c);
3041 default:
3042 pr_err("pfkey: Unknown policy event %d\n", c->event);
3043 break;
3044 }
3045
3046 return 0;
3047 }
3048
3049 static u32 get_acqseq(void)
3050 {
3051 u32 res;
3052 static atomic_t acqseq;
3053
3054 do {
3055 res = atomic_inc_return(&acqseq);
3056 } while (!res);
3057 return res;
3058 }
3059
3060 static bool pfkey_is_alive(const struct km_event *c)
3061 {
3062 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3063 struct sock *sk;
3064 bool is_alive = false;
3065
3066 rcu_read_lock();
3067 sk_for_each_rcu(sk, &net_pfkey->table) {
3068 if (pfkey_sk(sk)->registered) {
3069 is_alive = true;
3070 break;
3071 }
3072 }
3073 rcu_read_unlock();
3074
3075 return is_alive;
3076 }
3077
3078 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3079 {
3080 struct sk_buff *skb;
3081 struct sadb_msg *hdr;
3082 struct sadb_address *addr;
3083 struct sadb_x_policy *pol;
3084 int sockaddr_size;
3085 int size;
3086 struct sadb_x_sec_ctx *sec_ctx;
3087 struct xfrm_sec_ctx *xfrm_ctx;
3088 int ctx_size = 0;
3089
3090 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3091 if (!sockaddr_size)
3092 return -EINVAL;
3093
3094 size = sizeof(struct sadb_msg) +
3095 (sizeof(struct sadb_address) * 2) +
3096 (sockaddr_size * 2) +
3097 sizeof(struct sadb_x_policy);
3098
3099 if (x->id.proto == IPPROTO_AH)
3100 size += count_ah_combs(t);
3101 else if (x->id.proto == IPPROTO_ESP)
3102 size += count_esp_combs(t);
3103
3104 if ((xfrm_ctx = x->security)) {
3105 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3106 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3107 }
3108
3109 skb = alloc_skb(size + 16, GFP_ATOMIC);
3110 if (skb == NULL)
3111 return -ENOMEM;
3112
3113 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3114 hdr->sadb_msg_version = PF_KEY_V2;
3115 hdr->sadb_msg_type = SADB_ACQUIRE;
3116 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3117 hdr->sadb_msg_len = size / sizeof(uint64_t);
3118 hdr->sadb_msg_errno = 0;
3119 hdr->sadb_msg_reserved = 0;
3120 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3121 hdr->sadb_msg_pid = 0;
3122
3123 /* src address */
3124 addr = (struct sadb_address*) skb_put(skb,
3125 sizeof(struct sadb_address)+sockaddr_size);
3126 addr->sadb_address_len =
3127 (sizeof(struct sadb_address)+sockaddr_size)/
3128 sizeof(uint64_t);
3129 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3130 addr->sadb_address_proto = 0;
3131 addr->sadb_address_reserved = 0;
3132 addr->sadb_address_prefixlen =
3133 pfkey_sockaddr_fill(&x->props.saddr, 0,
3134 (struct sockaddr *) (addr + 1),
3135 x->props.family);
3136 if (!addr->sadb_address_prefixlen)
3137 BUG();
3138
3139 /* dst address */
3140 addr = (struct sadb_address*) skb_put(skb,
3141 sizeof(struct sadb_address)+sockaddr_size);
3142 addr->sadb_address_len =
3143 (sizeof(struct sadb_address)+sockaddr_size)/
3144 sizeof(uint64_t);
3145 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3146 addr->sadb_address_proto = 0;
3147 addr->sadb_address_reserved = 0;
3148 addr->sadb_address_prefixlen =
3149 pfkey_sockaddr_fill(&x->id.daddr, 0,
3150 (struct sockaddr *) (addr + 1),
3151 x->props.family);
3152 if (!addr->sadb_address_prefixlen)
3153 BUG();
3154
3155 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3156 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3157 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3158 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3159 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3160 pol->sadb_x_policy_reserved = 0;
3161 pol->sadb_x_policy_id = xp->index;
3162 pol->sadb_x_policy_priority = xp->priority;
3163
3164 /* Set sadb_comb's. */
3165 if (x->id.proto == IPPROTO_AH)
3166 dump_ah_combs(skb, t);
3167 else if (x->id.proto == IPPROTO_ESP)
3168 dump_esp_combs(skb, t);
3169
3170 /* security context */
3171 if (xfrm_ctx) {
3172 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3173 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3174 sec_ctx->sadb_x_sec_len =
3175 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3176 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3177 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3178 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3179 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3180 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3181 xfrm_ctx->ctx_len);
3182 }
3183
3184 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3185 }
3186
3187 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3188 u8 *data, int len, int *dir)
3189 {
3190 struct net *net = sock_net(sk);
3191 struct xfrm_policy *xp;
3192 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3193 struct sadb_x_sec_ctx *sec_ctx;
3194
3195 switch (sk->sk_family) {
3196 case AF_INET:
3197 if (opt != IP_IPSEC_POLICY) {
3198 *dir = -EOPNOTSUPP;
3199 return NULL;
3200 }
3201 break;
3202 #if IS_ENABLED(CONFIG_IPV6)
3203 case AF_INET6:
3204 if (opt != IPV6_IPSEC_POLICY) {
3205 *dir = -EOPNOTSUPP;
3206 return NULL;
3207 }
3208 break;
3209 #endif
3210 default:
3211 *dir = -EINVAL;
3212 return NULL;
3213 }
3214
3215 *dir = -EINVAL;
3216
3217 if (len < sizeof(struct sadb_x_policy) ||
3218 pol->sadb_x_policy_len*8 > len ||
3219 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3220 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3221 return NULL;
3222
3223 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3224 if (xp == NULL) {
3225 *dir = -ENOBUFS;
3226 return NULL;
3227 }
3228
3229 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3230 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3231
3232 xp->lft.soft_byte_limit = XFRM_INF;
3233 xp->lft.hard_byte_limit = XFRM_INF;
3234 xp->lft.soft_packet_limit = XFRM_INF;
3235 xp->lft.hard_packet_limit = XFRM_INF;
3236 xp->family = sk->sk_family;
3237
3238 xp->xfrm_nr = 0;
3239 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3240 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3241 goto out;
3242
3243 /* security context too */
3244 if (len >= (pol->sadb_x_policy_len*8 +
3245 sizeof(struct sadb_x_sec_ctx))) {
3246 char *p = (char *)pol;
3247 struct xfrm_user_sec_ctx *uctx;
3248
3249 p += pol->sadb_x_policy_len*8;
3250 sec_ctx = (struct sadb_x_sec_ctx *)p;
3251 if (len < pol->sadb_x_policy_len*8 +
3252 sec_ctx->sadb_x_sec_len) {
3253 *dir = -EINVAL;
3254 goto out;
3255 }
3256 if ((*dir = verify_sec_ctx_len(p)))
3257 goto out;
3258 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3259 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3260 kfree(uctx);
3261
3262 if (*dir)
3263 goto out;
3264 }
3265
3266 *dir = pol->sadb_x_policy_dir-1;
3267 return xp;
3268
3269 out:
3270 xp->walk.dead = 1;
3271 xfrm_policy_destroy(xp);
3272 return NULL;
3273 }
3274
3275 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3276 {
3277 struct sk_buff *skb;
3278 struct sadb_msg *hdr;
3279 struct sadb_sa *sa;
3280 struct sadb_address *addr;
3281 struct sadb_x_nat_t_port *n_port;
3282 int sockaddr_size;
3283 int size;
3284 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3285 struct xfrm_encap_tmpl *natt = NULL;
3286
3287 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3288 if (!sockaddr_size)
3289 return -EINVAL;
3290
3291 if (!satype)
3292 return -EINVAL;
3293
3294 if (!x->encap)
3295 return -EINVAL;
3296
3297 natt = x->encap;
3298
3299 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3300 *
3301 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3302 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3303 */
3304
3305 size = sizeof(struct sadb_msg) +
3306 sizeof(struct sadb_sa) +
3307 (sizeof(struct sadb_address) * 2) +
3308 (sockaddr_size * 2) +
3309 (sizeof(struct sadb_x_nat_t_port) * 2);
3310
3311 skb = alloc_skb(size + 16, GFP_ATOMIC);
3312 if (skb == NULL)
3313 return -ENOMEM;
3314
3315 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3316 hdr->sadb_msg_version = PF_KEY_V2;
3317 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3318 hdr->sadb_msg_satype = satype;
3319 hdr->sadb_msg_len = size / sizeof(uint64_t);
3320 hdr->sadb_msg_errno = 0;
3321 hdr->sadb_msg_reserved = 0;
3322 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3323 hdr->sadb_msg_pid = 0;
3324
3325 /* SA */
3326 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3327 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3328 sa->sadb_sa_exttype = SADB_EXT_SA;
3329 sa->sadb_sa_spi = x->id.spi;
3330 sa->sadb_sa_replay = 0;
3331 sa->sadb_sa_state = 0;
3332 sa->sadb_sa_auth = 0;
3333 sa->sadb_sa_encrypt = 0;
3334 sa->sadb_sa_flags = 0;
3335
3336 /* ADDRESS_SRC (old addr) */
3337 addr = (struct sadb_address*)
3338 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3339 addr->sadb_address_len =
3340 (sizeof(struct sadb_address)+sockaddr_size)/
3341 sizeof(uint64_t);
3342 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3343 addr->sadb_address_proto = 0;
3344 addr->sadb_address_reserved = 0;
3345 addr->sadb_address_prefixlen =
3346 pfkey_sockaddr_fill(&x->props.saddr, 0,
3347 (struct sockaddr *) (addr + 1),
3348 x->props.family);
3349 if (!addr->sadb_address_prefixlen)
3350 BUG();
3351
3352 /* NAT_T_SPORT (old port) */
3353 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3354 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3355 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3356 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3357 n_port->sadb_x_nat_t_port_reserved = 0;
3358
3359 /* ADDRESS_DST (new addr) */
3360 addr = (struct sadb_address*)
3361 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3362 addr->sadb_address_len =
3363 (sizeof(struct sadb_address)+sockaddr_size)/
3364 sizeof(uint64_t);
3365 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3366 addr->sadb_address_proto = 0;
3367 addr->sadb_address_reserved = 0;
3368 addr->sadb_address_prefixlen =
3369 pfkey_sockaddr_fill(ipaddr, 0,
3370 (struct sockaddr *) (addr + 1),
3371 x->props.family);
3372 if (!addr->sadb_address_prefixlen)
3373 BUG();
3374
3375 /* NAT_T_DPORT (new port) */
3376 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3377 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3378 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3379 n_port->sadb_x_nat_t_port_port = sport;
3380 n_port->sadb_x_nat_t_port_reserved = 0;
3381
3382 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3383 }
3384
3385 #ifdef CONFIG_NET_KEY_MIGRATE
3386 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3387 const struct xfrm_selector *sel)
3388 {
3389 struct sadb_address *addr;
3390 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3391 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3392 addr->sadb_address_exttype = type;
3393 addr->sadb_address_proto = sel->proto;
3394 addr->sadb_address_reserved = 0;
3395
3396 switch (type) {
3397 case SADB_EXT_ADDRESS_SRC:
3398 addr->sadb_address_prefixlen = sel->prefixlen_s;
3399 pfkey_sockaddr_fill(&sel->saddr, 0,
3400 (struct sockaddr *)(addr + 1),
3401 sel->family);
3402 break;
3403 case SADB_EXT_ADDRESS_DST:
3404 addr->sadb_address_prefixlen = sel->prefixlen_d;
3405 pfkey_sockaddr_fill(&sel->daddr, 0,
3406 (struct sockaddr *)(addr + 1),
3407 sel->family);
3408 break;
3409 default:
3410 return -EINVAL;
3411 }
3412
3413 return 0;
3414 }
3415
3416
3417 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3418 {
3419 struct sadb_x_kmaddress *kma;
3420 u8 *sa;
3421 int family = k->family;
3422 int socklen = pfkey_sockaddr_len(family);
3423 int size_req;
3424
3425 size_req = (sizeof(struct sadb_x_kmaddress) +
3426 pfkey_sockaddr_pair_size(family));
3427
3428 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3429 memset(kma, 0, size_req);
3430 kma->sadb_x_kmaddress_len = size_req / 8;
3431 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3432 kma->sadb_x_kmaddress_reserved = k->reserved;
3433
3434 sa = (u8 *)(kma + 1);
3435 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3436 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3437 return -EINVAL;
3438
3439 return 0;
3440 }
3441
3442 static int set_ipsecrequest(struct sk_buff *skb,
3443 uint8_t proto, uint8_t mode, int level,
3444 uint32_t reqid, uint8_t family,
3445 const xfrm_address_t *src, const xfrm_address_t *dst)
3446 {
3447 struct sadb_x_ipsecrequest *rq;
3448 u8 *sa;
3449 int socklen = pfkey_sockaddr_len(family);
3450 int size_req;
3451
3452 size_req = sizeof(struct sadb_x_ipsecrequest) +
3453 pfkey_sockaddr_pair_size(family);
3454
3455 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3456 memset(rq, 0, size_req);
3457 rq->sadb_x_ipsecrequest_len = size_req;
3458 rq->sadb_x_ipsecrequest_proto = proto;
3459 rq->sadb_x_ipsecrequest_mode = mode;
3460 rq->sadb_x_ipsecrequest_level = level;
3461 rq->sadb_x_ipsecrequest_reqid = reqid;
3462
3463 sa = (u8 *) (rq + 1);
3464 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3465 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3466 return -EINVAL;
3467
3468 return 0;
3469 }
3470 #endif
3471
3472 #ifdef CONFIG_NET_KEY_MIGRATE
3473 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3474 const struct xfrm_migrate *m, int num_bundles,
3475 const struct xfrm_kmaddress *k)
3476 {
3477 int i;
3478 int sasize_sel;
3479 int size = 0;
3480 int size_pol = 0;
3481 struct sk_buff *skb;
3482 struct sadb_msg *hdr;
3483 struct sadb_x_policy *pol;
3484 const struct xfrm_migrate *mp;
3485
3486 if (type != XFRM_POLICY_TYPE_MAIN)
3487 return 0;
3488
3489 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3490 return -EINVAL;
3491
3492 if (k != NULL) {
3493 /* addresses for KM */
3494 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3495 pfkey_sockaddr_pair_size(k->family));
3496 }
3497
3498 /* selector */
3499 sasize_sel = pfkey_sockaddr_size(sel->family);
3500 if (!sasize_sel)
3501 return -EINVAL;
3502 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3503
3504 /* policy info */
3505 size_pol += sizeof(struct sadb_x_policy);
3506
3507 /* ipsecrequests */
3508 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3509 /* old locator pair */
3510 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3511 pfkey_sockaddr_pair_size(mp->old_family);
3512 /* new locator pair */
3513 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3514 pfkey_sockaddr_pair_size(mp->new_family);
3515 }
3516
3517 size += sizeof(struct sadb_msg) + size_pol;
3518
3519 /* alloc buffer */
3520 skb = alloc_skb(size, GFP_ATOMIC);
3521 if (skb == NULL)
3522 return -ENOMEM;
3523
3524 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3525 hdr->sadb_msg_version = PF_KEY_V2;
3526 hdr->sadb_msg_type = SADB_X_MIGRATE;
3527 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3528 hdr->sadb_msg_len = size / 8;
3529 hdr->sadb_msg_errno = 0;
3530 hdr->sadb_msg_reserved = 0;
3531 hdr->sadb_msg_seq = 0;
3532 hdr->sadb_msg_pid = 0;
3533
3534 /* Addresses to be used by KM for negotiation, if ext is available */
3535 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3536 goto err;
3537
3538 /* selector src */
3539 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3540
3541 /* selector dst */
3542 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3543
3544 /* policy information */
3545 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3546 pol->sadb_x_policy_len = size_pol / 8;
3547 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3548 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3549 pol->sadb_x_policy_dir = dir + 1;
3550 pol->sadb_x_policy_reserved = 0;
3551 pol->sadb_x_policy_id = 0;
3552 pol->sadb_x_policy_priority = 0;
3553
3554 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3555 /* old ipsecrequest */
3556 int mode = pfkey_mode_from_xfrm(mp->mode);
3557 if (mode < 0)
3558 goto err;
3559 if (set_ipsecrequest(skb, mp->proto, mode,
3560 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3561 mp->reqid, mp->old_family,
3562 &mp->old_saddr, &mp->old_daddr) < 0)
3563 goto err;
3564
3565 /* new ipsecrequest */
3566 if (set_ipsecrequest(skb, mp->proto, mode,
3567 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3568 mp->reqid, mp->new_family,
3569 &mp->new_saddr, &mp->new_daddr) < 0)
3570 goto err;
3571 }
3572
3573 /* broadcast migrate message to sockets */
3574 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3575
3576 return 0;
3577
3578 err:
3579 kfree_skb(skb);
3580 return -EINVAL;
3581 }
3582 #else
3583 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3584 const struct xfrm_migrate *m, int num_bundles,
3585 const struct xfrm_kmaddress *k)
3586 {
3587 return -ENOPROTOOPT;
3588 }
3589 #endif
3590
3591 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3592 {
3593 struct sock *sk = sock->sk;
3594 struct sk_buff *skb = NULL;
3595 struct sadb_msg *hdr = NULL;
3596 int err;
3597 struct net *net = sock_net(sk);
3598
3599 err = -EOPNOTSUPP;
3600 if (msg->msg_flags & MSG_OOB)
3601 goto out;
3602
3603 err = -EMSGSIZE;
3604 if ((unsigned int)len > sk->sk_sndbuf - 32)
3605 goto out;
3606
3607 err = -ENOBUFS;
3608 skb = alloc_skb(len, GFP_KERNEL);
3609 if (skb == NULL)
3610 goto out;
3611
3612 err = -EFAULT;
3613 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3614 goto out;
3615
3616 hdr = pfkey_get_base_msg(skb, &err);
3617 if (!hdr)
3618 goto out;
3619
3620 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3621 err = pfkey_process(sk, skb, hdr);
3622 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3623
3624 out:
3625 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3626 err = 0;
3627 kfree_skb(skb);
3628
3629 return err ? : len;
3630 }
3631
3632 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3633 int flags)
3634 {
3635 struct sock *sk = sock->sk;
3636 struct pfkey_sock *pfk = pfkey_sk(sk);
3637 struct sk_buff *skb;
3638 int copied, err;
3639
3640 err = -EINVAL;
3641 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3642 goto out;
3643
3644 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3645 if (skb == NULL)
3646 goto out;
3647
3648 copied = skb->len;
3649 if (copied > len) {
3650 msg->msg_flags |= MSG_TRUNC;
3651 copied = len;
3652 }
3653
3654 skb_reset_transport_header(skb);
3655 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3656 if (err)
3657 goto out_free;
3658
3659 sock_recv_ts_and_drops(msg, sk, skb);
3660
3661 err = (flags & MSG_TRUNC) ? skb->len : copied;
3662
3663 if (pfk->dump.dump != NULL &&
3664 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3665 pfkey_do_dump(pfk);
3666
3667 out_free:
3668 skb_free_datagram(sk, skb);
3669 out:
3670 return err;
3671 }
3672
3673 static const struct proto_ops pfkey_ops = {
3674 .family = PF_KEY,
3675 .owner = THIS_MODULE,
3676 /* Operations that make no sense on pfkey sockets. */
3677 .bind = sock_no_bind,
3678 .connect = sock_no_connect,
3679 .socketpair = sock_no_socketpair,
3680 .accept = sock_no_accept,
3681 .getname = sock_no_getname,
3682 .ioctl = sock_no_ioctl,
3683 .listen = sock_no_listen,
3684 .shutdown = sock_no_shutdown,
3685 .setsockopt = sock_no_setsockopt,
3686 .getsockopt = sock_no_getsockopt,
3687 .mmap = sock_no_mmap,
3688 .sendpage = sock_no_sendpage,
3689
3690 /* Now the operations that really occur. */
3691 .release = pfkey_release,
3692 .poll = datagram_poll,
3693 .sendmsg = pfkey_sendmsg,
3694 .recvmsg = pfkey_recvmsg,
3695 };
3696
3697 static const struct net_proto_family pfkey_family_ops = {
3698 .family = PF_KEY,
3699 .create = pfkey_create,
3700 .owner = THIS_MODULE,
3701 };
3702
3703 #ifdef CONFIG_PROC_FS
3704 static int pfkey_seq_show(struct seq_file *f, void *v)
3705 {
3706 struct sock *s = sk_entry(v);
3707
3708 if (v == SEQ_START_TOKEN)
3709 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3710 else
3711 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3712 s,
3713 atomic_read(&s->sk_refcnt),
3714 sk_rmem_alloc_get(s),
3715 sk_wmem_alloc_get(s),
3716 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3717 sock_i_ino(s)
3718 );
3719 return 0;
3720 }
3721
3722 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3723 __acquires(rcu)
3724 {
3725 struct net *net = seq_file_net(f);
3726 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3727
3728 rcu_read_lock();
3729 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3730 }
3731
3732 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3733 {
3734 struct net *net = seq_file_net(f);
3735 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3736
3737 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3738 }
3739
3740 static void pfkey_seq_stop(struct seq_file *f, void *v)
3741 __releases(rcu)
3742 {
3743 rcu_read_unlock();
3744 }
3745
3746 static const struct seq_operations pfkey_seq_ops = {
3747 .start = pfkey_seq_start,
3748 .next = pfkey_seq_next,
3749 .stop = pfkey_seq_stop,
3750 .show = pfkey_seq_show,
3751 };
3752
3753 static int pfkey_seq_open(struct inode *inode, struct file *file)
3754 {
3755 return seq_open_net(inode, file, &pfkey_seq_ops,
3756 sizeof(struct seq_net_private));
3757 }
3758
3759 static const struct file_operations pfkey_proc_ops = {
3760 .open = pfkey_seq_open,
3761 .read = seq_read,
3762 .llseek = seq_lseek,
3763 .release = seq_release_net,
3764 };
3765
3766 static int __net_init pfkey_init_proc(struct net *net)
3767 {
3768 struct proc_dir_entry *e;
3769
3770 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3771 if (e == NULL)
3772 return -ENOMEM;
3773
3774 return 0;
3775 }
3776
3777 static void __net_exit pfkey_exit_proc(struct net *net)
3778 {
3779 remove_proc_entry("pfkey", net->proc_net);
3780 }
3781 #else
3782 static inline int pfkey_init_proc(struct net *net)
3783 {
3784 return 0;
3785 }
3786
3787 static inline void pfkey_exit_proc(struct net *net)
3788 {
3789 }
3790 #endif
3791
3792 static struct xfrm_mgr pfkeyv2_mgr =
3793 {
3794 .id = "pfkeyv2",
3795 .notify = pfkey_send_notify,
3796 .acquire = pfkey_send_acquire,
3797 .compile_policy = pfkey_compile_policy,
3798 .new_mapping = pfkey_send_new_mapping,
3799 .notify_policy = pfkey_send_policy_notify,
3800 .migrate = pfkey_send_migrate,
3801 .is_alive = pfkey_is_alive,
3802 };
3803
3804 static int __net_init pfkey_net_init(struct net *net)
3805 {
3806 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3807 int rv;
3808
3809 INIT_HLIST_HEAD(&net_pfkey->table);
3810 atomic_set(&net_pfkey->socks_nr, 0);
3811
3812 rv = pfkey_init_proc(net);
3813
3814 return rv;
3815 }
3816
3817 static void __net_exit pfkey_net_exit(struct net *net)
3818 {
3819 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3820
3821 pfkey_exit_proc(net);
3822 BUG_ON(!hlist_empty(&net_pfkey->table));
3823 }
3824
3825 static struct pernet_operations pfkey_net_ops = {
3826 .init = pfkey_net_init,
3827 .exit = pfkey_net_exit,
3828 .id = &pfkey_net_id,
3829 .size = sizeof(struct netns_pfkey),
3830 };
3831
3832 static void __exit ipsec_pfkey_exit(void)
3833 {
3834 xfrm_unregister_km(&pfkeyv2_mgr);
3835 sock_unregister(PF_KEY);
3836 unregister_pernet_subsys(&pfkey_net_ops);
3837 proto_unregister(&key_proto);
3838 }
3839
3840 static int __init ipsec_pfkey_init(void)
3841 {
3842 int err = proto_register(&key_proto, 0);
3843
3844 if (err != 0)
3845 goto out;
3846
3847 err = register_pernet_subsys(&pfkey_net_ops);
3848 if (err != 0)
3849 goto out_unregister_key_proto;
3850 err = sock_register(&pfkey_family_ops);
3851 if (err != 0)
3852 goto out_unregister_pernet;
3853 err = xfrm_register_km(&pfkeyv2_mgr);
3854 if (err != 0)
3855 goto out_sock_unregister;
3856 out:
3857 return err;
3858
3859 out_sock_unregister:
3860 sock_unregister(PF_KEY);
3861 out_unregister_pernet:
3862 unregister_pernet_subsys(&pfkey_net_ops);
3863 out_unregister_key_proto:
3864 proto_unregister(&key_proto);
3865 goto out;
3866 }
3867
3868 module_init(ipsec_pfkey_init);
3869 module_exit(ipsec_pfkey_exit);
3870 MODULE_LICENSE("GPL");
3871 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux with added FPC-III support