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Linux 4.8.3
[linux/fpc-iii.git] / net / key / af_key.c
blobf9c9ecb0cdd3b3eea618538fda2e884583f9bc09
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, kern);
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,
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, GFP_ATOMIC, 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, GFP_ATOMIC, sk);
263
264 /* Error is cleared after successful 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, GFP_KERNEL, 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, 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, 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 x->geniv = a->uinfo.encr.geniv;
1194 }
1195 }
1196 /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199 &x->props.saddr);
1200 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201 &x->id.daddr);
1202
1203 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206 if (mode < 0) {
1207 err = -EINVAL;
1208 goto out;
1209 }
1210 x->props.mode = mode;
1211 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212 }
1213
1214 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217 /* Nobody uses this, but we try. */
1218 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220 }
1221
1222 if (!x->sel.family)
1223 x->sel.family = x->props.family;
1224
1225 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226 const struct sadb_x_nat_t_type* n_type;
1227 struct xfrm_encap_tmpl *natt;
1228
1229 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230 if (!x->encap)
1231 goto out;
1232
1233 natt = x->encap;
1234 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238 const struct sadb_x_nat_t_port *n_port =
1239 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241 }
1242 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243 const struct sadb_x_nat_t_port *n_port =
1244 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246 }
1247 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248 }
1249
1250 err = xfrm_init_state(x);
1251 if (err)
1252 goto out;
1253
1254 x->km.seq = hdr->sadb_msg_seq;
1255 return x;
1256
1257 out:
1258 x->km.state = XFRM_STATE_DEAD;
1259 xfrm_state_put(x);
1260 return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265 return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270 struct net *net = sock_net(sk);
1271 struct sk_buff *resp_skb;
1272 struct sadb_x_sa2 *sa2;
1273 struct sadb_address *saddr, *daddr;
1274 struct sadb_msg *out_hdr;
1275 struct sadb_spirange *range;
1276 struct xfrm_state *x = NULL;
1277 int mode;
1278 int err;
1279 u32 min_spi, max_spi;
1280 u32 reqid;
1281 u8 proto;
1282 unsigned short family;
1283 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287 return -EINVAL;
1288
1289 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290 if (proto == 0)
1291 return -EINVAL;
1292
1293 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295 if (mode < 0)
1296 return -EINVAL;
1297 reqid = sa2->sadb_x_sa2_reqid;
1298 } else {
1299 mode = 0;
1300 reqid = 0;
1301 }
1302
1303 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307 switch (family) {
1308 case AF_INET:
1309 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313 case AF_INET6:
1314 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316 break;
1317 #endif
1318 }
1319
1320 if (hdr->sadb_msg_seq) {
1321 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323 xfrm_state_put(x);
1324 x = NULL;
1325 }
1326 }
1327
1328 if (!x)
1329 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331 if (x == NULL)
1332 return -ENOENT;
1333
1334 min_spi = 0x100;
1335 max_spi = 0x0fffffff;
1336
1337 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338 if (range) {
1339 min_spi = range->sadb_spirange_min;
1340 max_spi = range->sadb_spirange_max;
1341 }
1342
1343 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1344 if (err) {
1345 xfrm_state_put(x);
1346 return err;
1347 }
1348
1349 err = xfrm_alloc_spi(x, min_spi, max_spi);
1350 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1351
1352 if (IS_ERR(resp_skb)) {
1353 xfrm_state_put(x);
1354 return PTR_ERR(resp_skb);
1355 }
1356
1357 out_hdr = (struct sadb_msg *) resp_skb->data;
1358 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1359 out_hdr->sadb_msg_type = SADB_GETSPI;
1360 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1361 out_hdr->sadb_msg_errno = 0;
1362 out_hdr->sadb_msg_reserved = 0;
1363 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1364 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1365
1366 xfrm_state_put(x);
1367
1368 pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1369
1370 return 0;
1371 }
1372
1373 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1374 {
1375 struct net *net = sock_net(sk);
1376 struct xfrm_state *x;
1377
1378 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1379 return -EOPNOTSUPP;
1380
1381 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1382 return 0;
1383
1384 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1385 if (x == NULL)
1386 return 0;
1387
1388 spin_lock_bh(&x->lock);
1389 if (x->km.state == XFRM_STATE_ACQ)
1390 x->km.state = XFRM_STATE_ERROR;
1391
1392 spin_unlock_bh(&x->lock);
1393 xfrm_state_put(x);
1394 return 0;
1395 }
1396
1397 static inline int event2poltype(int event)
1398 {
1399 switch (event) {
1400 case XFRM_MSG_DELPOLICY:
1401 return SADB_X_SPDDELETE;
1402 case XFRM_MSG_NEWPOLICY:
1403 return SADB_X_SPDADD;
1404 case XFRM_MSG_UPDPOLICY:
1405 return SADB_X_SPDUPDATE;
1406 case XFRM_MSG_POLEXPIRE:
1407 // return SADB_X_SPDEXPIRE;
1408 default:
1409 pr_err("pfkey: Unknown policy event %d\n", event);
1410 break;
1411 }
1412
1413 return 0;
1414 }
1415
1416 static inline int event2keytype(int event)
1417 {
1418 switch (event) {
1419 case XFRM_MSG_DELSA:
1420 return SADB_DELETE;
1421 case XFRM_MSG_NEWSA:
1422 return SADB_ADD;
1423 case XFRM_MSG_UPDSA:
1424 return SADB_UPDATE;
1425 case XFRM_MSG_EXPIRE:
1426 return SADB_EXPIRE;
1427 default:
1428 pr_err("pfkey: Unknown SA event %d\n", event);
1429 break;
1430 }
1431
1432 return 0;
1433 }
1434
1435 /* ADD/UPD/DEL */
1436 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1437 {
1438 struct sk_buff *skb;
1439 struct sadb_msg *hdr;
1440
1441 skb = pfkey_xfrm_state2msg(x);
1442
1443 if (IS_ERR(skb))
1444 return PTR_ERR(skb);
1445
1446 hdr = (struct sadb_msg *) skb->data;
1447 hdr->sadb_msg_version = PF_KEY_V2;
1448 hdr->sadb_msg_type = event2keytype(c->event);
1449 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1450 hdr->sadb_msg_errno = 0;
1451 hdr->sadb_msg_reserved = 0;
1452 hdr->sadb_msg_seq = c->seq;
1453 hdr->sadb_msg_pid = c->portid;
1454
1455 pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1456
1457 return 0;
1458 }
1459
1460 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1461 {
1462 struct net *net = sock_net(sk);
1463 struct xfrm_state *x;
1464 int err;
1465 struct km_event c;
1466
1467 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1468 if (IS_ERR(x))
1469 return PTR_ERR(x);
1470
1471 xfrm_state_hold(x);
1472 if (hdr->sadb_msg_type == SADB_ADD)
1473 err = xfrm_state_add(x);
1474 else
1475 err = xfrm_state_update(x);
1476
1477 xfrm_audit_state_add(x, err ? 0 : 1, true);
1478
1479 if (err < 0) {
1480 x->km.state = XFRM_STATE_DEAD;
1481 __xfrm_state_put(x);
1482 goto out;
1483 }
1484
1485 if (hdr->sadb_msg_type == SADB_ADD)
1486 c.event = XFRM_MSG_NEWSA;
1487 else
1488 c.event = XFRM_MSG_UPDSA;
1489 c.seq = hdr->sadb_msg_seq;
1490 c.portid = hdr->sadb_msg_pid;
1491 km_state_notify(x, &c);
1492 out:
1493 xfrm_state_put(x);
1494 return err;
1495 }
1496
1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499 struct net *net = sock_net(sk);
1500 struct xfrm_state *x;
1501 struct km_event c;
1502 int err;
1503
1504 if (!ext_hdrs[SADB_EXT_SA-1] ||
1505 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1506 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1507 return -EINVAL;
1508
1509 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1510 if (x == NULL)
1511 return -ESRCH;
1512
1513 if ((err = security_xfrm_state_delete(x)))
1514 goto out;
1515
1516 if (xfrm_state_kern(x)) {
1517 err = -EPERM;
1518 goto out;
1519 }
1520
1521 err = xfrm_state_delete(x);
1522
1523 if (err < 0)
1524 goto out;
1525
1526 c.seq = hdr->sadb_msg_seq;
1527 c.portid = hdr->sadb_msg_pid;
1528 c.event = XFRM_MSG_DELSA;
1529 km_state_notify(x, &c);
1530 out:
1531 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1532 xfrm_state_put(x);
1533
1534 return err;
1535 }
1536
1537 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1538 {
1539 struct net *net = sock_net(sk);
1540 __u8 proto;
1541 struct sk_buff *out_skb;
1542 struct sadb_msg *out_hdr;
1543 struct xfrm_state *x;
1544
1545 if (!ext_hdrs[SADB_EXT_SA-1] ||
1546 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548 return -EINVAL;
1549
1550 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551 if (x == NULL)
1552 return -ESRCH;
1553
1554 out_skb = pfkey_xfrm_state2msg(x);
1555 proto = x->id.proto;
1556 xfrm_state_put(x);
1557 if (IS_ERR(out_skb))
1558 return PTR_ERR(out_skb);
1559
1560 out_hdr = (struct sadb_msg *) out_skb->data;
1561 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1562 out_hdr->sadb_msg_type = SADB_GET;
1563 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1564 out_hdr->sadb_msg_errno = 0;
1565 out_hdr->sadb_msg_reserved = 0;
1566 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1567 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1568 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1569
1570 return 0;
1571 }
1572
1573 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1574 gfp_t allocation)
1575 {
1576 struct sk_buff *skb;
1577 struct sadb_msg *hdr;
1578 int len, auth_len, enc_len, i;
1579
1580 auth_len = xfrm_count_pfkey_auth_supported();
1581 if (auth_len) {
1582 auth_len *= sizeof(struct sadb_alg);
1583 auth_len += sizeof(struct sadb_supported);
1584 }
1585
1586 enc_len = xfrm_count_pfkey_enc_supported();
1587 if (enc_len) {
1588 enc_len *= sizeof(struct sadb_alg);
1589 enc_len += sizeof(struct sadb_supported);
1590 }
1591
1592 len = enc_len + auth_len + sizeof(struct sadb_msg);
1593
1594 skb = alloc_skb(len + 16, allocation);
1595 if (!skb)
1596 goto out_put_algs;
1597
1598 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1599 pfkey_hdr_dup(hdr, orig);
1600 hdr->sadb_msg_errno = 0;
1601 hdr->sadb_msg_len = len / sizeof(uint64_t);
1602
1603 if (auth_len) {
1604 struct sadb_supported *sp;
1605 struct sadb_alg *ap;
1606
1607 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1608 ap = (struct sadb_alg *) (sp + 1);
1609
1610 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1611 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1612
1613 for (i = 0; ; i++) {
1614 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1615 if (!aalg)
1616 break;
1617 if (!aalg->pfkey_supported)
1618 continue;
1619 if (aalg->available)
1620 *ap++ = aalg->desc;
1621 }
1622 }
1623
1624 if (enc_len) {
1625 struct sadb_supported *sp;
1626 struct sadb_alg *ap;
1627
1628 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1629 ap = (struct sadb_alg *) (sp + 1);
1630
1631 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1632 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1633
1634 for (i = 0; ; i++) {
1635 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1636 if (!ealg)
1637 break;
1638 if (!ealg->pfkey_supported)
1639 continue;
1640 if (ealg->available)
1641 *ap++ = ealg->desc;
1642 }
1643 }
1644
1645 out_put_algs:
1646 return skb;
1647 }
1648
1649 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1650 {
1651 struct pfkey_sock *pfk = pfkey_sk(sk);
1652 struct sk_buff *supp_skb;
1653
1654 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1655 return -EINVAL;
1656
1657 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1658 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1659 return -EEXIST;
1660 pfk->registered |= (1<<hdr->sadb_msg_satype);
1661 }
1662
1663 xfrm_probe_algs();
1664
1665 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1666 if (!supp_skb) {
1667 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1668 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1669
1670 return -ENOBUFS;
1671 }
1672
1673 pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1674
1675 return 0;
1676 }
1677
1678 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1679 {
1680 struct sk_buff *skb;
1681 struct sadb_msg *hdr;
1682
1683 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1684 if (!skb)
1685 return -ENOBUFS;
1686
1687 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1688 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1689 hdr->sadb_msg_errno = (uint8_t) 0;
1690 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1691
1692 return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1693 }
1694
1695 static int key_notify_sa_flush(const struct km_event *c)
1696 {
1697 struct sk_buff *skb;
1698 struct sadb_msg *hdr;
1699
1700 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1701 if (!skb)
1702 return -ENOBUFS;
1703 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1704 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1705 hdr->sadb_msg_type = SADB_FLUSH;
1706 hdr->sadb_msg_seq = c->seq;
1707 hdr->sadb_msg_pid = c->portid;
1708 hdr->sadb_msg_version = PF_KEY_V2;
1709 hdr->sadb_msg_errno = (uint8_t) 0;
1710 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1711 hdr->sadb_msg_reserved = 0;
1712
1713 pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1714
1715 return 0;
1716 }
1717
1718 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1719 {
1720 struct net *net = sock_net(sk);
1721 unsigned int proto;
1722 struct km_event c;
1723 int err, err2;
1724
1725 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1726 if (proto == 0)
1727 return -EINVAL;
1728
1729 err = xfrm_state_flush(net, proto, true);
1730 err2 = unicast_flush_resp(sk, hdr);
1731 if (err || err2) {
1732 if (err == -ESRCH) /* empty table - go quietly */
1733 err = 0;
1734 return err ? err : err2;
1735 }
1736
1737 c.data.proto = proto;
1738 c.seq = hdr->sadb_msg_seq;
1739 c.portid = hdr->sadb_msg_pid;
1740 c.event = XFRM_MSG_FLUSHSA;
1741 c.net = net;
1742 km_state_notify(NULL, &c);
1743
1744 return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749 struct pfkey_sock *pfk = ptr;
1750 struct sk_buff *out_skb;
1751 struct sadb_msg *out_hdr;
1752
1753 if (!pfkey_can_dump(&pfk->sk))
1754 return -ENOBUFS;
1755
1756 out_skb = pfkey_xfrm_state2msg(x);
1757 if (IS_ERR(out_skb))
1758 return PTR_ERR(out_skb);
1759
1760 out_hdr = (struct sadb_msg *) out_skb->data;
1761 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762 out_hdr->sadb_msg_type = SADB_DUMP;
1763 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764 out_hdr->sadb_msg_errno = 0;
1765 out_hdr->sadb_msg_reserved = 0;
1766 out_hdr->sadb_msg_seq = count + 1;
1767 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1768
1769 if (pfk->dump.skb)
1770 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1771 &pfk->sk, sock_net(&pfk->sk));
1772 pfk->dump.skb = out_skb;
1773
1774 return 0;
1775 }
1776
1777 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778 {
1779 struct net *net = sock_net(&pfk->sk);
1780 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781 }
1782
1783 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784 {
1785 struct net *net = sock_net(&pfk->sk);
1786
1787 xfrm_state_walk_done(&pfk->dump.u.state, net);
1788 }
1789
1790 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1791 {
1792 u8 proto;
1793 struct xfrm_address_filter *filter = NULL;
1794 struct pfkey_sock *pfk = pfkey_sk(sk);
1795
1796 if (pfk->dump.dump != NULL)
1797 return -EBUSY;
1798
1799 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1800 if (proto == 0)
1801 return -EINVAL;
1802
1803 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1804 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1805
1806 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1807 if (filter == NULL)
1808 return -ENOMEM;
1809
1810 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1811 sizeof(xfrm_address_t));
1812 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1813 sizeof(xfrm_address_t));
1814 filter->family = xfilter->sadb_x_filter_family;
1815 filter->splen = xfilter->sadb_x_filter_splen;
1816 filter->dplen = xfilter->sadb_x_filter_dplen;
1817 }
1818
1819 pfk->dump.msg_version = hdr->sadb_msg_version;
1820 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1821 pfk->dump.dump = pfkey_dump_sa;
1822 pfk->dump.done = pfkey_dump_sa_done;
1823 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1824
1825 return pfkey_do_dump(pfk);
1826 }
1827
1828 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1829 {
1830 struct pfkey_sock *pfk = pfkey_sk(sk);
1831 int satype = hdr->sadb_msg_satype;
1832 bool reset_errno = false;
1833
1834 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1835 reset_errno = true;
1836 if (satype != 0 && satype != 1)
1837 return -EINVAL;
1838 pfk->promisc = satype;
1839 }
1840 if (reset_errno && skb_cloned(skb))
1841 skb = skb_copy(skb, GFP_KERNEL);
1842 else
1843 skb = skb_clone(skb, GFP_KERNEL);
1844
1845 if (reset_errno && skb) {
1846 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1847 new_hdr->sadb_msg_errno = 0;
1848 }
1849
1850 pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1851 return 0;
1852 }
1853
1854 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1855 {
1856 int i;
1857 u32 reqid = *(u32*)ptr;
1858
1859 for (i=0; i<xp->xfrm_nr; i++) {
1860 if (xp->xfrm_vec[i].reqid == reqid)
1861 return -EEXIST;
1862 }
1863 return 0;
1864 }
1865
1866 static u32 gen_reqid(struct net *net)
1867 {
1868 struct xfrm_policy_walk walk;
1869 u32 start;
1870 int rc;
1871 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1872
1873 start = reqid;
1874 do {
1875 ++reqid;
1876 if (reqid == 0)
1877 reqid = IPSEC_MANUAL_REQID_MAX+1;
1878 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1879 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1880 xfrm_policy_walk_done(&walk, net);
1881 if (rc != -EEXIST)
1882 return reqid;
1883 } while (reqid != start);
1884 return 0;
1885 }
1886
1887 static int
1888 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1889 {
1890 struct net *net = xp_net(xp);
1891 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1892 int mode;
1893
1894 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1895 return -ELOOP;
1896
1897 if (rq->sadb_x_ipsecrequest_mode == 0)
1898 return -EINVAL;
1899
1900 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1901 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1902 return -EINVAL;
1903 t->mode = mode;
1904 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1905 t->optional = 1;
1906 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1907 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1908 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1909 t->reqid = 0;
1910 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1911 return -ENOBUFS;
1912 }
1913
1914 /* addresses present only in tunnel mode */
1915 if (t->mode == XFRM_MODE_TUNNEL) {
1916 u8 *sa = (u8 *) (rq + 1);
1917 int family, socklen;
1918
1919 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1920 &t->saddr);
1921 if (!family)
1922 return -EINVAL;
1923
1924 socklen = pfkey_sockaddr_len(family);
1925 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1926 &t->id.daddr) != family)
1927 return -EINVAL;
1928 t->encap_family = family;
1929 } else
1930 t->encap_family = xp->family;
1931
1932 /* No way to set this via kame pfkey */
1933 t->allalgs = 1;
1934 xp->xfrm_nr++;
1935 return 0;
1936 }
1937
1938 static int
1939 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1940 {
1941 int err;
1942 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1943 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1944
1945 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1946 return -EINVAL;
1947
1948 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1949 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1950 return err;
1951 len -= rq->sadb_x_ipsecrequest_len;
1952 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1953 }
1954 return 0;
1955 }
1956
1957 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1958 {
1959 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1960
1961 if (xfrm_ctx) {
1962 int len = sizeof(struct sadb_x_sec_ctx);
1963 len += xfrm_ctx->ctx_len;
1964 return PFKEY_ALIGN8(len);
1965 }
1966 return 0;
1967 }
1968
1969 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1970 {
1971 const struct xfrm_tmpl *t;
1972 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1973 int socklen = 0;
1974 int i;
1975
1976 for (i=0; i<xp->xfrm_nr; i++) {
1977 t = xp->xfrm_vec + i;
1978 socklen += pfkey_sockaddr_len(t->encap_family);
1979 }
1980
1981 return sizeof(struct sadb_msg) +
1982 (sizeof(struct sadb_lifetime) * 3) +
1983 (sizeof(struct sadb_address) * 2) +
1984 (sockaddr_size * 2) +
1985 sizeof(struct sadb_x_policy) +
1986 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1987 (socklen * 2) +
1988 pfkey_xfrm_policy2sec_ctx_size(xp);
1989 }
1990
1991 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1992 {
1993 struct sk_buff *skb;
1994 int size;
1995
1996 size = pfkey_xfrm_policy2msg_size(xp);
1997
1998 skb = alloc_skb(size + 16, GFP_ATOMIC);
1999 if (skb == NULL)
2000 return ERR_PTR(-ENOBUFS);
2001
2002 return skb;
2003 }
2004
2005 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2006 {
2007 struct sadb_msg *hdr;
2008 struct sadb_address *addr;
2009 struct sadb_lifetime *lifetime;
2010 struct sadb_x_policy *pol;
2011 struct sadb_x_sec_ctx *sec_ctx;
2012 struct xfrm_sec_ctx *xfrm_ctx;
2013 int i;
2014 int size;
2015 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2016 int socklen = pfkey_sockaddr_len(xp->family);
2017
2018 size = pfkey_xfrm_policy2msg_size(xp);
2019
2020 /* call should fill header later */
2021 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2022 memset(hdr, 0, size); /* XXX do we need this ? */
2023
2024 /* src address */
2025 addr = (struct sadb_address*) skb_put(skb,
2026 sizeof(struct sadb_address)+sockaddr_size);
2027 addr->sadb_address_len =
2028 (sizeof(struct sadb_address)+sockaddr_size)/
2029 sizeof(uint64_t);
2030 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2031 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2032 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2033 addr->sadb_address_reserved = 0;
2034 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2035 xp->selector.sport,
2036 (struct sockaddr *) (addr + 1),
2037 xp->family))
2038 BUG();
2039
2040 /* dst address */
2041 addr = (struct sadb_address*) skb_put(skb,
2042 sizeof(struct sadb_address)+sockaddr_size);
2043 addr->sadb_address_len =
2044 (sizeof(struct sadb_address)+sockaddr_size)/
2045 sizeof(uint64_t);
2046 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2047 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2048 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2049 addr->sadb_address_reserved = 0;
2050
2051 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2052 (struct sockaddr *) (addr + 1),
2053 xp->family);
2054
2055 /* hard time */
2056 lifetime = (struct sadb_lifetime *) skb_put(skb,
2057 sizeof(struct sadb_lifetime));
2058 lifetime->sadb_lifetime_len =
2059 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2060 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2061 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2062 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2063 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2064 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2065 /* soft time */
2066 lifetime = (struct sadb_lifetime *) skb_put(skb,
2067 sizeof(struct sadb_lifetime));
2068 lifetime->sadb_lifetime_len =
2069 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2070 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2071 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2072 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2073 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2074 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2075 /* current time */
2076 lifetime = (struct sadb_lifetime *) skb_put(skb,
2077 sizeof(struct sadb_lifetime));
2078 lifetime->sadb_lifetime_len =
2079 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2080 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2081 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2082 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2083 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2084 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2085
2086 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2087 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2088 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2089 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2090 if (xp->action == XFRM_POLICY_ALLOW) {
2091 if (xp->xfrm_nr)
2092 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2093 else
2094 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2095 }
2096 pol->sadb_x_policy_dir = dir+1;
2097 pol->sadb_x_policy_reserved = 0;
2098 pol->sadb_x_policy_id = xp->index;
2099 pol->sadb_x_policy_priority = xp->priority;
2100
2101 for (i=0; i<xp->xfrm_nr; i++) {
2102 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2103 struct sadb_x_ipsecrequest *rq;
2104 int req_size;
2105 int mode;
2106
2107 req_size = sizeof(struct sadb_x_ipsecrequest);
2108 if (t->mode == XFRM_MODE_TUNNEL) {
2109 socklen = pfkey_sockaddr_len(t->encap_family);
2110 req_size += socklen * 2;
2111 } else {
2112 size -= 2*socklen;
2113 }
2114 rq = (void*)skb_put(skb, req_size);
2115 pol->sadb_x_policy_len += req_size/8;
2116 memset(rq, 0, sizeof(*rq));
2117 rq->sadb_x_ipsecrequest_len = req_size;
2118 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2119 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2120 return -EINVAL;
2121 rq->sadb_x_ipsecrequest_mode = mode;
2122 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2123 if (t->reqid)
2124 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2125 if (t->optional)
2126 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2127 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2128
2129 if (t->mode == XFRM_MODE_TUNNEL) {
2130 u8 *sa = (void *)(rq + 1);
2131 pfkey_sockaddr_fill(&t->saddr, 0,
2132 (struct sockaddr *)sa,
2133 t->encap_family);
2134 pfkey_sockaddr_fill(&t->id.daddr, 0,
2135 (struct sockaddr *) (sa + socklen),
2136 t->encap_family);
2137 }
2138 }
2139
2140 /* security context */
2141 if ((xfrm_ctx = xp->security)) {
2142 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2143
2144 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2145 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2146 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2147 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2148 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2149 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2150 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2151 xfrm_ctx->ctx_len);
2152 }
2153
2154 hdr->sadb_msg_len = size / sizeof(uint64_t);
2155 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2156
2157 return 0;
2158 }
2159
2160 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2161 {
2162 struct sk_buff *out_skb;
2163 struct sadb_msg *out_hdr;
2164 int err;
2165
2166 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2167 if (IS_ERR(out_skb))
2168 return PTR_ERR(out_skb);
2169
2170 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2171 if (err < 0)
2172 return err;
2173
2174 out_hdr = (struct sadb_msg *) out_skb->data;
2175 out_hdr->sadb_msg_version = PF_KEY_V2;
2176
2177 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2178 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2179 else
2180 out_hdr->sadb_msg_type = event2poltype(c->event);
2181 out_hdr->sadb_msg_errno = 0;
2182 out_hdr->sadb_msg_seq = c->seq;
2183 out_hdr->sadb_msg_pid = c->portid;
2184 pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2185 return 0;
2186
2187 }
2188
2189 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2190 {
2191 struct net *net = sock_net(sk);
2192 int err = 0;
2193 struct sadb_lifetime *lifetime;
2194 struct sadb_address *sa;
2195 struct sadb_x_policy *pol;
2196 struct xfrm_policy *xp;
2197 struct km_event c;
2198 struct sadb_x_sec_ctx *sec_ctx;
2199
2200 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2201 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2202 !ext_hdrs[SADB_X_EXT_POLICY-1])
2203 return -EINVAL;
2204
2205 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2206 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2207 return -EINVAL;
2208 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2209 return -EINVAL;
2210
2211 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2212 if (xp == NULL)
2213 return -ENOBUFS;
2214
2215 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2216 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2217 xp->priority = pol->sadb_x_policy_priority;
2218
2219 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2220 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2221 xp->selector.family = xp->family;
2222 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2223 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2224 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2225 if (xp->selector.sport)
2226 xp->selector.sport_mask = htons(0xffff);
2227
2228 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2229 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2230 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2231
2232 /* Amusing, we set this twice. KAME apps appear to set same value
2233 * in both addresses.
2234 */
2235 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2236
2237 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2238 if (xp->selector.dport)
2239 xp->selector.dport_mask = htons(0xffff);
2240
2241 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2242 if (sec_ctx != NULL) {
2243 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2244
2245 if (!uctx) {
2246 err = -ENOBUFS;
2247 goto out;
2248 }
2249
2250 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2251 kfree(uctx);
2252
2253 if (err)
2254 goto out;
2255 }
2256
2257 xp->lft.soft_byte_limit = XFRM_INF;
2258 xp->lft.hard_byte_limit = XFRM_INF;
2259 xp->lft.soft_packet_limit = XFRM_INF;
2260 xp->lft.hard_packet_limit = XFRM_INF;
2261 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2262 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2263 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2264 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2265 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2266 }
2267 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2268 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2269 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2270 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2271 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2272 }
2273 xp->xfrm_nr = 0;
2274 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2275 (err = parse_ipsecrequests(xp, pol)) < 0)
2276 goto out;
2277
2278 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2279 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2280
2281 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2282
2283 if (err)
2284 goto out;
2285
2286 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2287 c.event = XFRM_MSG_UPDPOLICY;
2288 else
2289 c.event = XFRM_MSG_NEWPOLICY;
2290
2291 c.seq = hdr->sadb_msg_seq;
2292 c.portid = hdr->sadb_msg_pid;
2293
2294 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2295 xfrm_pol_put(xp);
2296 return 0;
2297
2298 out:
2299 xp->walk.dead = 1;
2300 xfrm_policy_destroy(xp);
2301 return err;
2302 }
2303
2304 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2305 {
2306 struct net *net = sock_net(sk);
2307 int err;
2308 struct sadb_address *sa;
2309 struct sadb_x_policy *pol;
2310 struct xfrm_policy *xp;
2311 struct xfrm_selector sel;
2312 struct km_event c;
2313 struct sadb_x_sec_ctx *sec_ctx;
2314 struct xfrm_sec_ctx *pol_ctx = NULL;
2315
2316 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2317 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2318 !ext_hdrs[SADB_X_EXT_POLICY-1])
2319 return -EINVAL;
2320
2321 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2322 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2323 return -EINVAL;
2324
2325 memset(&sel, 0, sizeof(sel));
2326
2327 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2328 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2329 sel.prefixlen_s = sa->sadb_address_prefixlen;
2330 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332 if (sel.sport)
2333 sel.sport_mask = htons(0xffff);
2334
2335 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2336 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2337 sel.prefixlen_d = sa->sadb_address_prefixlen;
2338 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2339 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2340 if (sel.dport)
2341 sel.dport_mask = htons(0xffff);
2342
2343 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2344 if (sec_ctx != NULL) {
2345 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2346
2347 if (!uctx)
2348 return -ENOMEM;
2349
2350 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2351 kfree(uctx);
2352 if (err)
2353 return err;
2354 }
2355
2356 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2357 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2358 1, &err);
2359 security_xfrm_policy_free(pol_ctx);
2360 if (xp == NULL)
2361 return -ENOENT;
2362
2363 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2364
2365 if (err)
2366 goto out;
2367
2368 c.seq = hdr->sadb_msg_seq;
2369 c.portid = hdr->sadb_msg_pid;
2370 c.data.byid = 0;
2371 c.event = XFRM_MSG_DELPOLICY;
2372 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2373
2374 out:
2375 xfrm_pol_put(xp);
2376 if (err == 0)
2377 xfrm_garbage_collect(net);
2378 return err;
2379 }
2380
2381 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2382 {
2383 int err;
2384 struct sk_buff *out_skb;
2385 struct sadb_msg *out_hdr;
2386 err = 0;
2387
2388 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2389 if (IS_ERR(out_skb)) {
2390 err = PTR_ERR(out_skb);
2391 goto out;
2392 }
2393 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2394 if (err < 0)
2395 goto out;
2396
2397 out_hdr = (struct sadb_msg *) out_skb->data;
2398 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2399 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2400 out_hdr->sadb_msg_satype = 0;
2401 out_hdr->sadb_msg_errno = 0;
2402 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2403 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2404 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2405 err = 0;
2406
2407 out:
2408 return err;
2409 }
2410
2411 #ifdef CONFIG_NET_KEY_MIGRATE
2412 static int pfkey_sockaddr_pair_size(sa_family_t family)
2413 {
2414 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2415 }
2416
2417 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2418 xfrm_address_t *saddr, xfrm_address_t *daddr,
2419 u16 *family)
2420 {
2421 int af, socklen;
2422
2423 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2424 return -EINVAL;
2425
2426 af = pfkey_sockaddr_extract(sa, saddr);
2427 if (!af)
2428 return -EINVAL;
2429
2430 socklen = pfkey_sockaddr_len(af);
2431 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2432 daddr) != af)
2433 return -EINVAL;
2434
2435 *family = af;
2436 return 0;
2437 }
2438
2439 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2440 struct xfrm_migrate *m)
2441 {
2442 int err;
2443 struct sadb_x_ipsecrequest *rq2;
2444 int mode;
2445
2446 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2447 len < rq1->sadb_x_ipsecrequest_len)
2448 return -EINVAL;
2449
2450 /* old endoints */
2451 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2452 rq1->sadb_x_ipsecrequest_len,
2453 &m->old_saddr, &m->old_daddr,
2454 &m->old_family);
2455 if (err)
2456 return err;
2457
2458 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2459 len -= rq1->sadb_x_ipsecrequest_len;
2460
2461 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2462 len < rq2->sadb_x_ipsecrequest_len)
2463 return -EINVAL;
2464
2465 /* new endpoints */
2466 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2467 rq2->sadb_x_ipsecrequest_len,
2468 &m->new_saddr, &m->new_daddr,
2469 &m->new_family);
2470 if (err)
2471 return err;
2472
2473 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2474 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2475 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2476 return -EINVAL;
2477
2478 m->proto = rq1->sadb_x_ipsecrequest_proto;
2479 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2480 return -EINVAL;
2481 m->mode = mode;
2482 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2483
2484 return ((int)(rq1->sadb_x_ipsecrequest_len +
2485 rq2->sadb_x_ipsecrequest_len));
2486 }
2487
2488 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2489 const struct sadb_msg *hdr, void * const *ext_hdrs)
2490 {
2491 int i, len, ret, err = -EINVAL;
2492 u8 dir;
2493 struct sadb_address *sa;
2494 struct sadb_x_kmaddress *kma;
2495 struct sadb_x_policy *pol;
2496 struct sadb_x_ipsecrequest *rq;
2497 struct xfrm_selector sel;
2498 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2499 struct xfrm_kmaddress k;
2500 struct net *net = sock_net(sk);
2501
2502 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2503 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2504 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2505 err = -EINVAL;
2506 goto out;
2507 }
2508
2509 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2510 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2511
2512 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2513 err = -EINVAL;
2514 goto out;
2515 }
2516
2517 if (kma) {
2518 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2519 k.reserved = kma->sadb_x_kmaddress_reserved;
2520 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2521 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2522 &k.local, &k.remote, &k.family);
2523 if (ret < 0) {
2524 err = ret;
2525 goto out;
2526 }
2527 }
2528
2529 dir = pol->sadb_x_policy_dir - 1;
2530 memset(&sel, 0, sizeof(sel));
2531
2532 /* set source address info of selector */
2533 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2534 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2535 sel.prefixlen_s = sa->sadb_address_prefixlen;
2536 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2537 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2538 if (sel.sport)
2539 sel.sport_mask = htons(0xffff);
2540
2541 /* set destination address info of selector */
2542 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2543 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2544 sel.prefixlen_d = sa->sadb_address_prefixlen;
2545 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2546 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2547 if (sel.dport)
2548 sel.dport_mask = htons(0xffff);
2549
2550 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2551
2552 /* extract ipsecrequests */
2553 i = 0;
2554 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2555
2556 while (len > 0 && i < XFRM_MAX_DEPTH) {
2557 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2558 if (ret < 0) {
2559 err = ret;
2560 goto out;
2561 } else {
2562 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2563 len -= ret;
2564 i++;
2565 }
2566 }
2567
2568 if (!i || len > 0) {
2569 err = -EINVAL;
2570 goto out;
2571 }
2572
2573 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2574 kma ? &k : NULL, net);
2575
2576 out:
2577 return err;
2578 }
2579 #else
2580 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2581 const struct sadb_msg *hdr, void * const *ext_hdrs)
2582 {
2583 return -ENOPROTOOPT;
2584 }
2585 #endif
2586
2587
2588 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2589 {
2590 struct net *net = sock_net(sk);
2591 unsigned int dir;
2592 int err = 0, delete;
2593 struct sadb_x_policy *pol;
2594 struct xfrm_policy *xp;
2595 struct km_event c;
2596
2597 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2598 return -EINVAL;
2599
2600 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2601 if (dir >= XFRM_POLICY_MAX)
2602 return -EINVAL;
2603
2604 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2605 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2606 dir, pol->sadb_x_policy_id, delete, &err);
2607 if (xp == NULL)
2608 return -ENOENT;
2609
2610 if (delete) {
2611 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2612
2613 if (err)
2614 goto out;
2615 c.seq = hdr->sadb_msg_seq;
2616 c.portid = hdr->sadb_msg_pid;
2617 c.data.byid = 1;
2618 c.event = XFRM_MSG_DELPOLICY;
2619 km_policy_notify(xp, dir, &c);
2620 } else {
2621 err = key_pol_get_resp(sk, xp, hdr, dir);
2622 }
2623
2624 out:
2625 xfrm_pol_put(xp);
2626 if (delete && err == 0)
2627 xfrm_garbage_collect(net);
2628 return err;
2629 }
2630
2631 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2632 {
2633 struct pfkey_sock *pfk = ptr;
2634 struct sk_buff *out_skb;
2635 struct sadb_msg *out_hdr;
2636 int err;
2637
2638 if (!pfkey_can_dump(&pfk->sk))
2639 return -ENOBUFS;
2640
2641 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2642 if (IS_ERR(out_skb))
2643 return PTR_ERR(out_skb);
2644
2645 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2646 if (err < 0)
2647 return err;
2648
2649 out_hdr = (struct sadb_msg *) out_skb->data;
2650 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2651 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2652 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2653 out_hdr->sadb_msg_errno = 0;
2654 out_hdr->sadb_msg_seq = count + 1;
2655 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2656
2657 if (pfk->dump.skb)
2658 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2659 &pfk->sk, sock_net(&pfk->sk));
2660 pfk->dump.skb = out_skb;
2661
2662 return 0;
2663 }
2664
2665 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2666 {
2667 struct net *net = sock_net(&pfk->sk);
2668 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2669 }
2670
2671 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2672 {
2673 struct net *net = sock_net((struct sock *)pfk);
2674
2675 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2676 }
2677
2678 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2679 {
2680 struct pfkey_sock *pfk = pfkey_sk(sk);
2681
2682 if (pfk->dump.dump != NULL)
2683 return -EBUSY;
2684
2685 pfk->dump.msg_version = hdr->sadb_msg_version;
2686 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2687 pfk->dump.dump = pfkey_dump_sp;
2688 pfk->dump.done = pfkey_dump_sp_done;
2689 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2690
2691 return pfkey_do_dump(pfk);
2692 }
2693
2694 static int key_notify_policy_flush(const struct km_event *c)
2695 {
2696 struct sk_buff *skb_out;
2697 struct sadb_msg *hdr;
2698
2699 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2700 if (!skb_out)
2701 return -ENOBUFS;
2702 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2703 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2704 hdr->sadb_msg_seq = c->seq;
2705 hdr->sadb_msg_pid = c->portid;
2706 hdr->sadb_msg_version = PF_KEY_V2;
2707 hdr->sadb_msg_errno = (uint8_t) 0;
2708 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2709 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2710 hdr->sadb_msg_reserved = 0;
2711 pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2712 return 0;
2713
2714 }
2715
2716 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2717 {
2718 struct net *net = sock_net(sk);
2719 struct km_event c;
2720 int err, err2;
2721
2722 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2723 err2 = unicast_flush_resp(sk, hdr);
2724 if (err || err2) {
2725 if (err == -ESRCH) /* empty table - old silent behavior */
2726 return 0;
2727 return err;
2728 }
2729
2730 c.data.type = XFRM_POLICY_TYPE_MAIN;
2731 c.event = XFRM_MSG_FLUSHPOLICY;
2732 c.portid = hdr->sadb_msg_pid;
2733 c.seq = hdr->sadb_msg_seq;
2734 c.net = net;
2735 km_policy_notify(NULL, 0, &c);
2736
2737 return 0;
2738 }
2739
2740 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2741 const struct sadb_msg *hdr, void * const *ext_hdrs);
2742 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2743 [SADB_RESERVED] = pfkey_reserved,
2744 [SADB_GETSPI] = pfkey_getspi,
2745 [SADB_UPDATE] = pfkey_add,
2746 [SADB_ADD] = pfkey_add,
2747 [SADB_DELETE] = pfkey_delete,
2748 [SADB_GET] = pfkey_get,
2749 [SADB_ACQUIRE] = pfkey_acquire,
2750 [SADB_REGISTER] = pfkey_register,
2751 [SADB_EXPIRE] = NULL,
2752 [SADB_FLUSH] = pfkey_flush,
2753 [SADB_DUMP] = pfkey_dump,
2754 [SADB_X_PROMISC] = pfkey_promisc,
2755 [SADB_X_PCHANGE] = NULL,
2756 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2757 [SADB_X_SPDADD] = pfkey_spdadd,
2758 [SADB_X_SPDDELETE] = pfkey_spddelete,
2759 [SADB_X_SPDGET] = pfkey_spdget,
2760 [SADB_X_SPDACQUIRE] = NULL,
2761 [SADB_X_SPDDUMP] = pfkey_spddump,
2762 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2763 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2764 [SADB_X_SPDDELETE2] = pfkey_spdget,
2765 [SADB_X_MIGRATE] = pfkey_migrate,
2766 };
2767
2768 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2769 {
2770 void *ext_hdrs[SADB_EXT_MAX];
2771 int err;
2772
2773 pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2774 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2775
2776 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2777 err = parse_exthdrs(skb, hdr, ext_hdrs);
2778 if (!err) {
2779 err = -EOPNOTSUPP;
2780 if (pfkey_funcs[hdr->sadb_msg_type])
2781 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2782 }
2783 return err;
2784 }
2785
2786 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2787 {
2788 struct sadb_msg *hdr = NULL;
2789
2790 if (skb->len < sizeof(*hdr)) {
2791 *errp = -EMSGSIZE;
2792 } else {
2793 hdr = (struct sadb_msg *) skb->data;
2794 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2795 hdr->sadb_msg_reserved != 0 ||
2796 (hdr->sadb_msg_type <= SADB_RESERVED ||
2797 hdr->sadb_msg_type > SADB_MAX)) {
2798 hdr = NULL;
2799 *errp = -EINVAL;
2800 } else if (hdr->sadb_msg_len != (skb->len /
2801 sizeof(uint64_t)) ||
2802 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2803 sizeof(uint64_t))) {
2804 hdr = NULL;
2805 *errp = -EMSGSIZE;
2806 } else {
2807 *errp = 0;
2808 }
2809 }
2810 return hdr;
2811 }
2812
2813 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2814 const struct xfrm_algo_desc *d)
2815 {
2816 unsigned int id = d->desc.sadb_alg_id;
2817
2818 if (id >= sizeof(t->aalgos) * 8)
2819 return 0;
2820
2821 return (t->aalgos >> id) & 1;
2822 }
2823
2824 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2825 const struct xfrm_algo_desc *d)
2826 {
2827 unsigned int id = d->desc.sadb_alg_id;
2828
2829 if (id >= sizeof(t->ealgos) * 8)
2830 return 0;
2831
2832 return (t->ealgos >> id) & 1;
2833 }
2834
2835 static int count_ah_combs(const struct xfrm_tmpl *t)
2836 {
2837 int i, sz = 0;
2838
2839 for (i = 0; ; i++) {
2840 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2841 if (!aalg)
2842 break;
2843 if (!aalg->pfkey_supported)
2844 continue;
2845 if (aalg_tmpl_set(t, aalg) && aalg->available)
2846 sz += sizeof(struct sadb_comb);
2847 }
2848 return sz + sizeof(struct sadb_prop);
2849 }
2850
2851 static int count_esp_combs(const struct xfrm_tmpl *t)
2852 {
2853 int i, k, sz = 0;
2854
2855 for (i = 0; ; i++) {
2856 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2857 if (!ealg)
2858 break;
2859
2860 if (!ealg->pfkey_supported)
2861 continue;
2862
2863 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2864 continue;
2865
2866 for (k = 1; ; k++) {
2867 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2868 if (!aalg)
2869 break;
2870
2871 if (!aalg->pfkey_supported)
2872 continue;
2873
2874 if (aalg_tmpl_set(t, aalg) && aalg->available)
2875 sz += sizeof(struct sadb_comb);
2876 }
2877 }
2878 return sz + sizeof(struct sadb_prop);
2879 }
2880
2881 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2882 {
2883 struct sadb_prop *p;
2884 int i;
2885
2886 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2887 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2888 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2889 p->sadb_prop_replay = 32;
2890 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2891
2892 for (i = 0; ; i++) {
2893 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2894 if (!aalg)
2895 break;
2896
2897 if (!aalg->pfkey_supported)
2898 continue;
2899
2900 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2901 struct sadb_comb *c;
2902 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2903 memset(c, 0, sizeof(*c));
2904 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2905 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2906 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2907 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2908 c->sadb_comb_hard_addtime = 24*60*60;
2909 c->sadb_comb_soft_addtime = 20*60*60;
2910 c->sadb_comb_hard_usetime = 8*60*60;
2911 c->sadb_comb_soft_usetime = 7*60*60;
2912 }
2913 }
2914 }
2915
2916 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2917 {
2918 struct sadb_prop *p;
2919 int i, k;
2920
2921 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2922 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2923 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2924 p->sadb_prop_replay = 32;
2925 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2926
2927 for (i=0; ; i++) {
2928 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2929 if (!ealg)
2930 break;
2931
2932 if (!ealg->pfkey_supported)
2933 continue;
2934
2935 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2936 continue;
2937
2938 for (k = 1; ; k++) {
2939 struct sadb_comb *c;
2940 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2941 if (!aalg)
2942 break;
2943 if (!aalg->pfkey_supported)
2944 continue;
2945 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2946 continue;
2947 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2948 memset(c, 0, sizeof(*c));
2949 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2950 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2951 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2952 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2953 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2954 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2955 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2956 c->sadb_comb_hard_addtime = 24*60*60;
2957 c->sadb_comb_soft_addtime = 20*60*60;
2958 c->sadb_comb_hard_usetime = 8*60*60;
2959 c->sadb_comb_soft_usetime = 7*60*60;
2960 }
2961 }
2962 }
2963
2964 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2965 {
2966 return 0;
2967 }
2968
2969 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2970 {
2971 struct sk_buff *out_skb;
2972 struct sadb_msg *out_hdr;
2973 int hard;
2974 int hsc;
2975
2976 hard = c->data.hard;
2977 if (hard)
2978 hsc = 2;
2979 else
2980 hsc = 1;
2981
2982 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2983 if (IS_ERR(out_skb))
2984 return PTR_ERR(out_skb);
2985
2986 out_hdr = (struct sadb_msg *) out_skb->data;
2987 out_hdr->sadb_msg_version = PF_KEY_V2;
2988 out_hdr->sadb_msg_type = SADB_EXPIRE;
2989 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2990 out_hdr->sadb_msg_errno = 0;
2991 out_hdr->sadb_msg_reserved = 0;
2992 out_hdr->sadb_msg_seq = 0;
2993 out_hdr->sadb_msg_pid = 0;
2994
2995 pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
2996 return 0;
2997 }
2998
2999 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3000 {
3001 struct net *net = x ? xs_net(x) : c->net;
3002 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3003
3004 if (atomic_read(&net_pfkey->socks_nr) == 0)
3005 return 0;
3006
3007 switch (c->event) {
3008 case XFRM_MSG_EXPIRE:
3009 return key_notify_sa_expire(x, c);
3010 case XFRM_MSG_DELSA:
3011 case XFRM_MSG_NEWSA:
3012 case XFRM_MSG_UPDSA:
3013 return key_notify_sa(x, c);
3014 case XFRM_MSG_FLUSHSA:
3015 return key_notify_sa_flush(c);
3016 case XFRM_MSG_NEWAE: /* not yet supported */
3017 break;
3018 default:
3019 pr_err("pfkey: Unknown SA event %d\n", c->event);
3020 break;
3021 }
3022
3023 return 0;
3024 }
3025
3026 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3027 {
3028 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3029 return 0;
3030
3031 switch (c->event) {
3032 case XFRM_MSG_POLEXPIRE:
3033 return key_notify_policy_expire(xp, c);
3034 case XFRM_MSG_DELPOLICY:
3035 case XFRM_MSG_NEWPOLICY:
3036 case XFRM_MSG_UPDPOLICY:
3037 return key_notify_policy(xp, dir, c);
3038 case XFRM_MSG_FLUSHPOLICY:
3039 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3040 break;
3041 return key_notify_policy_flush(c);
3042 default:
3043 pr_err("pfkey: Unknown policy event %d\n", c->event);
3044 break;
3045 }
3046
3047 return 0;
3048 }
3049
3050 static u32 get_acqseq(void)
3051 {
3052 u32 res;
3053 static atomic_t acqseq;
3054
3055 do {
3056 res = atomic_inc_return(&acqseq);
3057 } while (!res);
3058 return res;
3059 }
3060
3061 static bool pfkey_is_alive(const struct km_event *c)
3062 {
3063 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3064 struct sock *sk;
3065 bool is_alive = false;
3066
3067 rcu_read_lock();
3068 sk_for_each_rcu(sk, &net_pfkey->table) {
3069 if (pfkey_sk(sk)->registered) {
3070 is_alive = true;
3071 break;
3072 }
3073 }
3074 rcu_read_unlock();
3075
3076 return is_alive;
3077 }
3078
3079 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3080 {
3081 struct sk_buff *skb;
3082 struct sadb_msg *hdr;
3083 struct sadb_address *addr;
3084 struct sadb_x_policy *pol;
3085 int sockaddr_size;
3086 int size;
3087 struct sadb_x_sec_ctx *sec_ctx;
3088 struct xfrm_sec_ctx *xfrm_ctx;
3089 int ctx_size = 0;
3090
3091 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3092 if (!sockaddr_size)
3093 return -EINVAL;
3094
3095 size = sizeof(struct sadb_msg) +
3096 (sizeof(struct sadb_address) * 2) +
3097 (sockaddr_size * 2) +
3098 sizeof(struct sadb_x_policy);
3099
3100 if (x->id.proto == IPPROTO_AH)
3101 size += count_ah_combs(t);
3102 else if (x->id.proto == IPPROTO_ESP)
3103 size += count_esp_combs(t);
3104
3105 if ((xfrm_ctx = x->security)) {
3106 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3107 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3108 }
3109
3110 skb = alloc_skb(size + 16, GFP_ATOMIC);
3111 if (skb == NULL)
3112 return -ENOMEM;
3113
3114 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3115 hdr->sadb_msg_version = PF_KEY_V2;
3116 hdr->sadb_msg_type = SADB_ACQUIRE;
3117 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3118 hdr->sadb_msg_len = size / sizeof(uint64_t);
3119 hdr->sadb_msg_errno = 0;
3120 hdr->sadb_msg_reserved = 0;
3121 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3122 hdr->sadb_msg_pid = 0;
3123
3124 /* src address */
3125 addr = (struct sadb_address*) skb_put(skb,
3126 sizeof(struct sadb_address)+sockaddr_size);
3127 addr->sadb_address_len =
3128 (sizeof(struct sadb_address)+sockaddr_size)/
3129 sizeof(uint64_t);
3130 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3131 addr->sadb_address_proto = 0;
3132 addr->sadb_address_reserved = 0;
3133 addr->sadb_address_prefixlen =
3134 pfkey_sockaddr_fill(&x->props.saddr, 0,
3135 (struct sockaddr *) (addr + 1),
3136 x->props.family);
3137 if (!addr->sadb_address_prefixlen)
3138 BUG();
3139
3140 /* dst address */
3141 addr = (struct sadb_address*) skb_put(skb,
3142 sizeof(struct sadb_address)+sockaddr_size);
3143 addr->sadb_address_len =
3144 (sizeof(struct sadb_address)+sockaddr_size)/
3145 sizeof(uint64_t);
3146 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3147 addr->sadb_address_proto = 0;
3148 addr->sadb_address_reserved = 0;
3149 addr->sadb_address_prefixlen =
3150 pfkey_sockaddr_fill(&x->id.daddr, 0,
3151 (struct sockaddr *) (addr + 1),
3152 x->props.family);
3153 if (!addr->sadb_address_prefixlen)
3154 BUG();
3155
3156 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3157 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3158 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3159 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3160 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3161 pol->sadb_x_policy_reserved = 0;
3162 pol->sadb_x_policy_id = xp->index;
3163 pol->sadb_x_policy_priority = xp->priority;
3164
3165 /* Set sadb_comb's. */
3166 if (x->id.proto == IPPROTO_AH)
3167 dump_ah_combs(skb, t);
3168 else if (x->id.proto == IPPROTO_ESP)
3169 dump_esp_combs(skb, t);
3170
3171 /* security context */
3172 if (xfrm_ctx) {
3173 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3174 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3175 sec_ctx->sadb_x_sec_len =
3176 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3177 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3178 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3179 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3180 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3181 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3182 xfrm_ctx->ctx_len);
3183 }
3184
3185 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3186 }
3187
3188 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3189 u8 *data, int len, int *dir)
3190 {
3191 struct net *net = sock_net(sk);
3192 struct xfrm_policy *xp;
3193 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3194 struct sadb_x_sec_ctx *sec_ctx;
3195
3196 switch (sk->sk_family) {
3197 case AF_INET:
3198 if (opt != IP_IPSEC_POLICY) {
3199 *dir = -EOPNOTSUPP;
3200 return NULL;
3201 }
3202 break;
3203 #if IS_ENABLED(CONFIG_IPV6)
3204 case AF_INET6:
3205 if (opt != IPV6_IPSEC_POLICY) {
3206 *dir = -EOPNOTSUPP;
3207 return NULL;
3208 }
3209 break;
3210 #endif
3211 default:
3212 *dir = -EINVAL;
3213 return NULL;
3214 }
3215
3216 *dir = -EINVAL;
3217
3218 if (len < sizeof(struct sadb_x_policy) ||
3219 pol->sadb_x_policy_len*8 > len ||
3220 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3221 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3222 return NULL;
3223
3224 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3225 if (xp == NULL) {
3226 *dir = -ENOBUFS;
3227 return NULL;
3228 }
3229
3230 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3231 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3232
3233 xp->lft.soft_byte_limit = XFRM_INF;
3234 xp->lft.hard_byte_limit = XFRM_INF;
3235 xp->lft.soft_packet_limit = XFRM_INF;
3236 xp->lft.hard_packet_limit = XFRM_INF;
3237 xp->family = sk->sk_family;
3238
3239 xp->xfrm_nr = 0;
3240 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3241 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3242 goto out;
3243
3244 /* security context too */
3245 if (len >= (pol->sadb_x_policy_len*8 +
3246 sizeof(struct sadb_x_sec_ctx))) {
3247 char *p = (char *)pol;
3248 struct xfrm_user_sec_ctx *uctx;
3249
3250 p += pol->sadb_x_policy_len*8;
3251 sec_ctx = (struct sadb_x_sec_ctx *)p;
3252 if (len < pol->sadb_x_policy_len*8 +
3253 sec_ctx->sadb_x_sec_len) {
3254 *dir = -EINVAL;
3255 goto out;
3256 }
3257 if ((*dir = verify_sec_ctx_len(p)))
3258 goto out;
3259 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3260 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3261 kfree(uctx);
3262
3263 if (*dir)
3264 goto out;
3265 }
3266
3267 *dir = pol->sadb_x_policy_dir-1;
3268 return xp;
3269
3270 out:
3271 xp->walk.dead = 1;
3272 xfrm_policy_destroy(xp);
3273 return NULL;
3274 }
3275
3276 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3277 {
3278 struct sk_buff *skb;
3279 struct sadb_msg *hdr;
3280 struct sadb_sa *sa;
3281 struct sadb_address *addr;
3282 struct sadb_x_nat_t_port *n_port;
3283 int sockaddr_size;
3284 int size;
3285 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3286 struct xfrm_encap_tmpl *natt = NULL;
3287
3288 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3289 if (!sockaddr_size)
3290 return -EINVAL;
3291
3292 if (!satype)
3293 return -EINVAL;
3294
3295 if (!x->encap)
3296 return -EINVAL;
3297
3298 natt = x->encap;
3299
3300 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3301 *
3302 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3303 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3304 */
3305
3306 size = sizeof(struct sadb_msg) +
3307 sizeof(struct sadb_sa) +
3308 (sizeof(struct sadb_address) * 2) +
3309 (sockaddr_size * 2) +
3310 (sizeof(struct sadb_x_nat_t_port) * 2);
3311
3312 skb = alloc_skb(size + 16, GFP_ATOMIC);
3313 if (skb == NULL)
3314 return -ENOMEM;
3315
3316 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3317 hdr->sadb_msg_version = PF_KEY_V2;
3318 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3319 hdr->sadb_msg_satype = satype;
3320 hdr->sadb_msg_len = size / sizeof(uint64_t);
3321 hdr->sadb_msg_errno = 0;
3322 hdr->sadb_msg_reserved = 0;
3323 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3324 hdr->sadb_msg_pid = 0;
3325
3326 /* SA */
3327 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3328 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3329 sa->sadb_sa_exttype = SADB_EXT_SA;
3330 sa->sadb_sa_spi = x->id.spi;
3331 sa->sadb_sa_replay = 0;
3332 sa->sadb_sa_state = 0;
3333 sa->sadb_sa_auth = 0;
3334 sa->sadb_sa_encrypt = 0;
3335 sa->sadb_sa_flags = 0;
3336
3337 /* ADDRESS_SRC (old addr) */
3338 addr = (struct sadb_address*)
3339 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3340 addr->sadb_address_len =
3341 (sizeof(struct sadb_address)+sockaddr_size)/
3342 sizeof(uint64_t);
3343 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3344 addr->sadb_address_proto = 0;
3345 addr->sadb_address_reserved = 0;
3346 addr->sadb_address_prefixlen =
3347 pfkey_sockaddr_fill(&x->props.saddr, 0,
3348 (struct sockaddr *) (addr + 1),
3349 x->props.family);
3350 if (!addr->sadb_address_prefixlen)
3351 BUG();
3352
3353 /* NAT_T_SPORT (old port) */
3354 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3355 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3356 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3357 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3358 n_port->sadb_x_nat_t_port_reserved = 0;
3359
3360 /* ADDRESS_DST (new addr) */
3361 addr = (struct sadb_address*)
3362 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3363 addr->sadb_address_len =
3364 (sizeof(struct sadb_address)+sockaddr_size)/
3365 sizeof(uint64_t);
3366 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3367 addr->sadb_address_proto = 0;
3368 addr->sadb_address_reserved = 0;
3369 addr->sadb_address_prefixlen =
3370 pfkey_sockaddr_fill(ipaddr, 0,
3371 (struct sockaddr *) (addr + 1),
3372 x->props.family);
3373 if (!addr->sadb_address_prefixlen)
3374 BUG();
3375
3376 /* NAT_T_DPORT (new port) */
3377 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3378 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3379 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3380 n_port->sadb_x_nat_t_port_port = sport;
3381 n_port->sadb_x_nat_t_port_reserved = 0;
3382
3383 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3384 }
3385
3386 #ifdef CONFIG_NET_KEY_MIGRATE
3387 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3388 const struct xfrm_selector *sel)
3389 {
3390 struct sadb_address *addr;
3391 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3392 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3393 addr->sadb_address_exttype = type;
3394 addr->sadb_address_proto = sel->proto;
3395 addr->sadb_address_reserved = 0;
3396
3397 switch (type) {
3398 case SADB_EXT_ADDRESS_SRC:
3399 addr->sadb_address_prefixlen = sel->prefixlen_s;
3400 pfkey_sockaddr_fill(&sel->saddr, 0,
3401 (struct sockaddr *)(addr + 1),
3402 sel->family);
3403 break;
3404 case SADB_EXT_ADDRESS_DST:
3405 addr->sadb_address_prefixlen = sel->prefixlen_d;
3406 pfkey_sockaddr_fill(&sel->daddr, 0,
3407 (struct sockaddr *)(addr + 1),
3408 sel->family);
3409 break;
3410 default:
3411 return -EINVAL;
3412 }
3413
3414 return 0;
3415 }
3416
3417
3418 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3419 {
3420 struct sadb_x_kmaddress *kma;
3421 u8 *sa;
3422 int family = k->family;
3423 int socklen = pfkey_sockaddr_len(family);
3424 int size_req;
3425
3426 size_req = (sizeof(struct sadb_x_kmaddress) +
3427 pfkey_sockaddr_pair_size(family));
3428
3429 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3430 memset(kma, 0, size_req);
3431 kma->sadb_x_kmaddress_len = size_req / 8;
3432 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3433 kma->sadb_x_kmaddress_reserved = k->reserved;
3434
3435 sa = (u8 *)(kma + 1);
3436 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3437 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3438 return -EINVAL;
3439
3440 return 0;
3441 }
3442
3443 static int set_ipsecrequest(struct sk_buff *skb,
3444 uint8_t proto, uint8_t mode, int level,
3445 uint32_t reqid, uint8_t family,
3446 const xfrm_address_t *src, const xfrm_address_t *dst)
3447 {
3448 struct sadb_x_ipsecrequest *rq;
3449 u8 *sa;
3450 int socklen = pfkey_sockaddr_len(family);
3451 int size_req;
3452
3453 size_req = sizeof(struct sadb_x_ipsecrequest) +
3454 pfkey_sockaddr_pair_size(family);
3455
3456 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3457 memset(rq, 0, size_req);
3458 rq->sadb_x_ipsecrequest_len = size_req;
3459 rq->sadb_x_ipsecrequest_proto = proto;
3460 rq->sadb_x_ipsecrequest_mode = mode;
3461 rq->sadb_x_ipsecrequest_level = level;
3462 rq->sadb_x_ipsecrequest_reqid = reqid;
3463
3464 sa = (u8 *) (rq + 1);
3465 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3466 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3467 return -EINVAL;
3468
3469 return 0;
3470 }
3471 #endif
3472
3473 #ifdef CONFIG_NET_KEY_MIGRATE
3474 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3475 const struct xfrm_migrate *m, int num_bundles,
3476 const struct xfrm_kmaddress *k)
3477 {
3478 int i;
3479 int sasize_sel;
3480 int size = 0;
3481 int size_pol = 0;
3482 struct sk_buff *skb;
3483 struct sadb_msg *hdr;
3484 struct sadb_x_policy *pol;
3485 const struct xfrm_migrate *mp;
3486
3487 if (type != XFRM_POLICY_TYPE_MAIN)
3488 return 0;
3489
3490 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3491 return -EINVAL;
3492
3493 if (k != NULL) {
3494 /* addresses for KM */
3495 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3496 pfkey_sockaddr_pair_size(k->family));
3497 }
3498
3499 /* selector */
3500 sasize_sel = pfkey_sockaddr_size(sel->family);
3501 if (!sasize_sel)
3502 return -EINVAL;
3503 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3504
3505 /* policy info */
3506 size_pol += sizeof(struct sadb_x_policy);
3507
3508 /* ipsecrequests */
3509 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3510 /* old locator pair */
3511 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3512 pfkey_sockaddr_pair_size(mp->old_family);
3513 /* new locator pair */
3514 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3515 pfkey_sockaddr_pair_size(mp->new_family);
3516 }
3517
3518 size += sizeof(struct sadb_msg) + size_pol;
3519
3520 /* alloc buffer */
3521 skb = alloc_skb(size, GFP_ATOMIC);
3522 if (skb == NULL)
3523 return -ENOMEM;
3524
3525 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3526 hdr->sadb_msg_version = PF_KEY_V2;
3527 hdr->sadb_msg_type = SADB_X_MIGRATE;
3528 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3529 hdr->sadb_msg_len = size / 8;
3530 hdr->sadb_msg_errno = 0;
3531 hdr->sadb_msg_reserved = 0;
3532 hdr->sadb_msg_seq = 0;
3533 hdr->sadb_msg_pid = 0;
3534
3535 /* Addresses to be used by KM for negotiation, if ext is available */
3536 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3537 goto err;
3538
3539 /* selector src */
3540 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3541
3542 /* selector dst */
3543 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3544
3545 /* policy information */
3546 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3547 pol->sadb_x_policy_len = size_pol / 8;
3548 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3549 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3550 pol->sadb_x_policy_dir = dir + 1;
3551 pol->sadb_x_policy_reserved = 0;
3552 pol->sadb_x_policy_id = 0;
3553 pol->sadb_x_policy_priority = 0;
3554
3555 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3556 /* old ipsecrequest */
3557 int mode = pfkey_mode_from_xfrm(mp->mode);
3558 if (mode < 0)
3559 goto err;
3560 if (set_ipsecrequest(skb, mp->proto, mode,
3561 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3562 mp->reqid, mp->old_family,
3563 &mp->old_saddr, &mp->old_daddr) < 0)
3564 goto err;
3565
3566 /* new ipsecrequest */
3567 if (set_ipsecrequest(skb, mp->proto, mode,
3568 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3569 mp->reqid, mp->new_family,
3570 &mp->new_saddr, &mp->new_daddr) < 0)
3571 goto err;
3572 }
3573
3574 /* broadcast migrate message to sockets */
3575 pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3576
3577 return 0;
3578
3579 err:
3580 kfree_skb(skb);
3581 return -EINVAL;
3582 }
3583 #else
3584 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3585 const struct xfrm_migrate *m, int num_bundles,
3586 const struct xfrm_kmaddress *k)
3587 {
3588 return -ENOPROTOOPT;
3589 }
3590 #endif
3591
3592 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3593 {
3594 struct sock *sk = sock->sk;
3595 struct sk_buff *skb = NULL;
3596 struct sadb_msg *hdr = NULL;
3597 int err;
3598 struct net *net = sock_net(sk);
3599
3600 err = -EOPNOTSUPP;
3601 if (msg->msg_flags & MSG_OOB)
3602 goto out;
3603
3604 err = -EMSGSIZE;
3605 if ((unsigned int)len > sk->sk_sndbuf - 32)
3606 goto out;
3607
3608 err = -ENOBUFS;
3609 skb = alloc_skb(len, GFP_KERNEL);
3610 if (skb == NULL)
3611 goto out;
3612
3613 err = -EFAULT;
3614 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3615 goto out;
3616
3617 hdr = pfkey_get_base_msg(skb, &err);
3618 if (!hdr)
3619 goto out;
3620
3621 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3622 err = pfkey_process(sk, skb, hdr);
3623 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3624
3625 out:
3626 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3627 err = 0;
3628 kfree_skb(skb);
3629
3630 return err ? : len;
3631 }
3632
3633 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3634 int flags)
3635 {
3636 struct sock *sk = sock->sk;
3637 struct pfkey_sock *pfk = pfkey_sk(sk);
3638 struct sk_buff *skb;
3639 int copied, err;
3640
3641 err = -EINVAL;
3642 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3643 goto out;
3644
3645 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3646 if (skb == NULL)
3647 goto out;
3648
3649 copied = skb->len;
3650 if (copied > len) {
3651 msg->msg_flags |= MSG_TRUNC;
3652 copied = len;
3653 }
3654
3655 skb_reset_transport_header(skb);
3656 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3657 if (err)
3658 goto out_free;
3659
3660 sock_recv_ts_and_drops(msg, sk, skb);
3661
3662 err = (flags & MSG_TRUNC) ? skb->len : copied;
3663
3664 if (pfk->dump.dump != NULL &&
3665 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3666 pfkey_do_dump(pfk);
3667
3668 out_free:
3669 skb_free_datagram(sk, skb);
3670 out:
3671 return err;
3672 }
3673
3674 static const struct proto_ops pfkey_ops = {
3675 .family = PF_KEY,
3676 .owner = THIS_MODULE,
3677 /* Operations that make no sense on pfkey sockets. */
3678 .bind = sock_no_bind,
3679 .connect = sock_no_connect,
3680 .socketpair = sock_no_socketpair,
3681 .accept = sock_no_accept,
3682 .getname = sock_no_getname,
3683 .ioctl = sock_no_ioctl,
3684 .listen = sock_no_listen,
3685 .shutdown = sock_no_shutdown,
3686 .setsockopt = sock_no_setsockopt,
3687 .getsockopt = sock_no_getsockopt,
3688 .mmap = sock_no_mmap,
3689 .sendpage = sock_no_sendpage,
3690
3691 /* Now the operations that really occur. */
3692 .release = pfkey_release,
3693 .poll = datagram_poll,
3694 .sendmsg = pfkey_sendmsg,
3695 .recvmsg = pfkey_recvmsg,
3696 };
3697
3698 static const struct net_proto_family pfkey_family_ops = {
3699 .family = PF_KEY,
3700 .create = pfkey_create,
3701 .owner = THIS_MODULE,
3702 };
3703
3704 #ifdef CONFIG_PROC_FS
3705 static int pfkey_seq_show(struct seq_file *f, void *v)
3706 {
3707 struct sock *s = sk_entry(v);
3708
3709 if (v == SEQ_START_TOKEN)
3710 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3711 else
3712 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3713 s,
3714 atomic_read(&s->sk_refcnt),
3715 sk_rmem_alloc_get(s),
3716 sk_wmem_alloc_get(s),
3717 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3718 sock_i_ino(s)
3719 );
3720 return 0;
3721 }
3722
3723 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3724 __acquires(rcu)
3725 {
3726 struct net *net = seq_file_net(f);
3727 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3728
3729 rcu_read_lock();
3730 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3731 }
3732
3733 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3734 {
3735 struct net *net = seq_file_net(f);
3736 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3737
3738 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3739 }
3740
3741 static void pfkey_seq_stop(struct seq_file *f, void *v)
3742 __releases(rcu)
3743 {
3744 rcu_read_unlock();
3745 }
3746
3747 static const struct seq_operations pfkey_seq_ops = {
3748 .start = pfkey_seq_start,
3749 .next = pfkey_seq_next,
3750 .stop = pfkey_seq_stop,
3751 .show = pfkey_seq_show,
3752 };
3753
3754 static int pfkey_seq_open(struct inode *inode, struct file *file)
3755 {
3756 return seq_open_net(inode, file, &pfkey_seq_ops,
3757 sizeof(struct seq_net_private));
3758 }
3759
3760 static const struct file_operations pfkey_proc_ops = {
3761 .open = pfkey_seq_open,
3762 .read = seq_read,
3763 .llseek = seq_lseek,
3764 .release = seq_release_net,
3765 };
3766
3767 static int __net_init pfkey_init_proc(struct net *net)
3768 {
3769 struct proc_dir_entry *e;
3770
3771 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3772 if (e == NULL)
3773 return -ENOMEM;
3774
3775 return 0;
3776 }
3777
3778 static void __net_exit pfkey_exit_proc(struct net *net)
3779 {
3780 remove_proc_entry("pfkey", net->proc_net);
3781 }
3782 #else
3783 static inline int pfkey_init_proc(struct net *net)
3784 {
3785 return 0;
3786 }
3787
3788 static inline void pfkey_exit_proc(struct net *net)
3789 {
3790 }
3791 #endif
3792
3793 static struct xfrm_mgr pfkeyv2_mgr =
3794 {
3795 .id = "pfkeyv2",
3796 .notify = pfkey_send_notify,
3797 .acquire = pfkey_send_acquire,
3798 .compile_policy = pfkey_compile_policy,
3799 .new_mapping = pfkey_send_new_mapping,
3800 .notify_policy = pfkey_send_policy_notify,
3801 .migrate = pfkey_send_migrate,
3802 .is_alive = pfkey_is_alive,
3803 };
3804
3805 static int __net_init pfkey_net_init(struct net *net)
3806 {
3807 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3808 int rv;
3809
3810 INIT_HLIST_HEAD(&net_pfkey->table);
3811 atomic_set(&net_pfkey->socks_nr, 0);
3812
3813 rv = pfkey_init_proc(net);
3814
3815 return rv;
3816 }
3817
3818 static void __net_exit pfkey_net_exit(struct net *net)
3819 {
3820 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3821
3822 pfkey_exit_proc(net);
3823 BUG_ON(!hlist_empty(&net_pfkey->table));
3824 }
3825
3826 static struct pernet_operations pfkey_net_ops = {
3827 .init = pfkey_net_init,
3828 .exit = pfkey_net_exit,
3829 .id = &pfkey_net_id,
3830 .size = sizeof(struct netns_pfkey),
3831 };
3832
3833 static void __exit ipsec_pfkey_exit(void)
3834 {
3835 xfrm_unregister_km(&pfkeyv2_mgr);
3836 sock_unregister(PF_KEY);
3837 unregister_pernet_subsys(&pfkey_net_ops);
3838 proto_unregister(&key_proto);
3839 }
3840
3841 static int __init ipsec_pfkey_init(void)
3842 {
3843 int err = proto_register(&key_proto, 0);
3844
3845 if (err != 0)
3846 goto out;
3847
3848 err = register_pernet_subsys(&pfkey_net_ops);
3849 if (err != 0)
3850 goto out_unregister_key_proto;
3851 err = sock_register(&pfkey_family_ops);
3852 if (err != 0)
3853 goto out_unregister_pernet;
3854 err = xfrm_register_km(&pfkeyv2_mgr);
3855 if (err != 0)
3856 goto out_sock_unregister;
3857 out:
3858 return err;
3859
3860 out_sock_unregister:
3861 sock_unregister(PF_KEY);
3862 out_unregister_pernet:
3863 unregister_pernet_subsys(&pfkey_net_ops);
3864 out_unregister_key_proto:
3865 proto_unregister(&key_proto);
3866 goto out;
3867 }
3868
3869 module_init(ipsec_pfkey_init);
3870 module_exit(ipsec_pfkey_exit);
3871 MODULE_LICENSE("GPL");
3872 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux with added FPC-III support