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Merge branch 'parisc-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*skb2)->len);
209 *skb2 = NULL;
210 err = 0;
211 }
212 }
213 sock_put(sk);
214 return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria. */
218 #define BROADCAST_ALL 0
219 #define BROADCAST_ONE 1
220 #define BROADCAST_REGISTERED 2
221 #define BROADCAST_PROMISC_ONLY 4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 int broadcast_flags, struct sock *one_sk,
224 struct net *net)
225 {
226 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 struct sock *sk;
228 struct hlist_node *node;
229 struct sk_buff *skb2 = NULL;
230 int err = -ESRCH;
231
232 /* XXX Do we need something like netlink_overrun? I think
233 * XXX PF_KEY socket apps will not mind current behavior.
234 */
235 if (!skb)
236 return -ENOMEM;
237
238 rcu_read_lock();
239 sk_for_each_rcu(sk, node, &net_pfkey->table) {
240 struct pfkey_sock *pfk = pfkey_sk(sk);
241 int err2;
242
243 /* Yes, it means that if you are meant to receive this
244 * pfkey message you receive it twice as promiscuous
245 * socket.
246 */
247 if (pfk->promisc)
248 pfkey_broadcast_one(skb, &skb2, allocation, sk);
249
250 /* the exact target will be processed later */
251 if (sk == one_sk)
252 continue;
253 if (broadcast_flags != BROADCAST_ALL) {
254 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
255 continue;
256 if ((broadcast_flags & BROADCAST_REGISTERED) &&
257 !pfk->registered)
258 continue;
259 if (broadcast_flags & BROADCAST_ONE)
260 continue;
261 }
262
263 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
264
265 /* Error is cleare after succecful sending to at least one
266 * registered KM */
267 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
268 err = err2;
269 }
270 rcu_read_unlock();
271
272 if (one_sk != NULL)
273 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
274
275 kfree_skb(skb2);
276 kfree_skb(skb);
277 return err;
278 }
279
280 static int pfkey_do_dump(struct pfkey_sock *pfk)
281 {
282 struct sadb_msg *hdr;
283 int rc;
284
285 rc = pfk->dump.dump(pfk);
286 if (rc == -ENOBUFS)
287 return 0;
288
289 if (pfk->dump.skb) {
290 if (!pfkey_can_dump(&pfk->sk))
291 return 0;
292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 &pfk->sk, sock_net(&pfk->sk));
298 pfk->dump.skb = NULL;
299 }
300
301 pfkey_terminate_dump(pfk);
302 return rc;
303 }
304
305 static inline void pfkey_hdr_dup(struct sadb_msg *new,
306 const struct sadb_msg *orig)
307 {
308 *new = *orig;
309 }
310
311 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
312 {
313 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
314 struct sadb_msg *hdr;
315
316 if (!skb)
317 return -ENOBUFS;
318
319 /* Woe be to the platform trying to support PFKEY yet
320 * having normal errnos outside the 1-255 range, inclusive.
321 */
322 err = -err;
323 if (err == ERESTARTSYS ||
324 err == ERESTARTNOHAND ||
325 err == ERESTARTNOINTR)
326 err = EINTR;
327 if (err >= 512)
328 err = EINVAL;
329 BUG_ON(err <= 0 || err >= 256);
330
331 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
332 pfkey_hdr_dup(hdr, orig);
333 hdr->sadb_msg_errno = (uint8_t) err;
334 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
335 sizeof(uint64_t));
336
337 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
338
339 return 0;
340 }
341
342 static u8 sadb_ext_min_len[] = {
343 [SADB_EXT_RESERVED] = (u8) 0,
344 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
345 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
348 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
351 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
353 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
355 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
356 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
357 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
359 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
360 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
361 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
362 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
363 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
364 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
366 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
367 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
368 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
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 break;
409 }
410
411 return 0;
412 }
413
414 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
415 {
416 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
417 sec_ctx->sadb_x_ctx_len,
418 sizeof(uint64_t));
419 }
420
421 static inline int verify_sec_ctx_len(const void *p)
422 {
423 const struct sadb_x_sec_ctx *sec_ctx = p;
424 int len = sec_ctx->sadb_x_ctx_len;
425
426 if (len > PAGE_SIZE)
427 return -EINVAL;
428
429 len = pfkey_sec_ctx_len(sec_ctx);
430
431 if (sec_ctx->sadb_x_sec_len != len)
432 return -EINVAL;
433
434 return 0;
435 }
436
437 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
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_KERNEL);
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 break;
539 default:
540 return 0;
541 }
542 /* NOTREACHED */
543 }
544
545 static uint8_t
546 pfkey_proto2satype(uint16_t proto)
547 {
548 switch (proto) {
549 case IPPROTO_AH:
550 return SADB_SATYPE_AH;
551 case IPPROTO_ESP:
552 return SADB_SATYPE_ESP;
553 case IPPROTO_COMP:
554 return SADB_X_SATYPE_IPCOMP;
555 break;
556 default:
557 return 0;
558 }
559 /* NOTREACHED */
560 }
561
562 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
563 * say specifically 'just raw sockets' as we encode them as 255.
564 */
565
566 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
567 {
568 return proto == IPSEC_PROTO_ANY ? 0 : proto;
569 }
570
571 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
572 {
573 return proto ? proto : IPSEC_PROTO_ANY;
574 }
575
576 static inline int pfkey_sockaddr_len(sa_family_t family)
577 {
578 switch (family) {
579 case AF_INET:
580 return sizeof(struct sockaddr_in);
581 #if IS_ENABLED(CONFIG_IPV6)
582 case AF_INET6:
583 return sizeof(struct sockaddr_in6);
584 #endif
585 }
586 return 0;
587 }
588
589 static
590 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
591 {
592 switch (sa->sa_family) {
593 case AF_INET:
594 xaddr->a4 =
595 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
596 return AF_INET;
597 #if IS_ENABLED(CONFIG_IPV6)
598 case AF_INET6:
599 memcpy(xaddr->a6,
600 &((struct sockaddr_in6 *)sa)->sin6_addr,
601 sizeof(struct in6_addr));
602 return AF_INET6;
603 #endif
604 }
605 return 0;
606 }
607
608 static
609 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
610 {
611 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
612 xaddr);
613 }
614
615 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
616 {
617 const struct sadb_sa *sa;
618 const struct sadb_address *addr;
619 uint16_t proto;
620 unsigned short family;
621 xfrm_address_t *xaddr;
622
623 sa = ext_hdrs[SADB_EXT_SA - 1];
624 if (sa == NULL)
625 return NULL;
626
627 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
628 if (proto == 0)
629 return NULL;
630
631 /* sadb_address_len should be checked by caller */
632 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
633 if (addr == NULL)
634 return NULL;
635
636 family = ((const struct sockaddr *)(addr + 1))->sa_family;
637 switch (family) {
638 case AF_INET:
639 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
640 break;
641 #if IS_ENABLED(CONFIG_IPV6)
642 case AF_INET6:
643 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
644 break;
645 #endif
646 default:
647 xaddr = NULL;
648 }
649
650 if (!xaddr)
651 return NULL;
652
653 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
654 }
655
656 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
657
658 static int
659 pfkey_sockaddr_size(sa_family_t family)
660 {
661 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
662 }
663
664 static inline int pfkey_mode_from_xfrm(int mode)
665 {
666 switch(mode) {
667 case XFRM_MODE_TRANSPORT:
668 return IPSEC_MODE_TRANSPORT;
669 case XFRM_MODE_TUNNEL:
670 return IPSEC_MODE_TUNNEL;
671 case XFRM_MODE_BEET:
672 return IPSEC_MODE_BEET;
673 default:
674 return -1;
675 }
676 }
677
678 static inline int pfkey_mode_to_xfrm(int mode)
679 {
680 switch(mode) {
681 case IPSEC_MODE_ANY: /*XXX*/
682 case IPSEC_MODE_TRANSPORT:
683 return XFRM_MODE_TRANSPORT;
684 case IPSEC_MODE_TUNNEL:
685 return XFRM_MODE_TUNNEL;
686 case IPSEC_MODE_BEET:
687 return XFRM_MODE_BEET;
688 default:
689 return -1;
690 }
691 }
692
693 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
694 struct sockaddr *sa,
695 unsigned short family)
696 {
697 switch (family) {
698 case AF_INET:
699 {
700 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
701 sin->sin_family = AF_INET;
702 sin->sin_port = port;
703 sin->sin_addr.s_addr = xaddr->a4;
704 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
705 return 32;
706 }
707 #if IS_ENABLED(CONFIG_IPV6)
708 case AF_INET6:
709 {
710 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
711 sin6->sin6_family = AF_INET6;
712 sin6->sin6_port = port;
713 sin6->sin6_flowinfo = 0;
714 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
715 sin6->sin6_scope_id = 0;
716 return 128;
717 }
718 #endif
719 }
720 return 0;
721 }
722
723 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
724 int add_keys, int hsc)
725 {
726 struct sk_buff *skb;
727 struct sadb_msg *hdr;
728 struct sadb_sa *sa;
729 struct sadb_lifetime *lifetime;
730 struct sadb_address *addr;
731 struct sadb_key *key;
732 struct sadb_x_sa2 *sa2;
733 struct sadb_x_sec_ctx *sec_ctx;
734 struct xfrm_sec_ctx *xfrm_ctx;
735 int ctx_size = 0;
736 int size;
737 int auth_key_size = 0;
738 int encrypt_key_size = 0;
739 int sockaddr_size;
740 struct xfrm_encap_tmpl *natt = NULL;
741 int mode;
742
743 /* address family check */
744 sockaddr_size = pfkey_sockaddr_size(x->props.family);
745 if (!sockaddr_size)
746 return ERR_PTR(-EINVAL);
747
748 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
749 key(AE), (identity(SD),) (sensitivity)> */
750 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
751 sizeof(struct sadb_lifetime) +
752 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
753 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
754 sizeof(struct sadb_address)*2 +
755 sockaddr_size*2 +
756 sizeof(struct sadb_x_sa2);
757
758 if ((xfrm_ctx = x->security)) {
759 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
760 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
761 }
762
763 /* identity & sensitivity */
764 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
765 size += sizeof(struct sadb_address) + sockaddr_size;
766
767 if (add_keys) {
768 if (x->aalg && x->aalg->alg_key_len) {
769 auth_key_size =
770 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
771 size += sizeof(struct sadb_key) + auth_key_size;
772 }
773 if (x->ealg && x->ealg->alg_key_len) {
774 encrypt_key_size =
775 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
776 size += sizeof(struct sadb_key) + encrypt_key_size;
777 }
778 }
779 if (x->encap)
780 natt = x->encap;
781
782 if (natt && natt->encap_type) {
783 size += sizeof(struct sadb_x_nat_t_type);
784 size += sizeof(struct sadb_x_nat_t_port);
785 size += sizeof(struct sadb_x_nat_t_port);
786 }
787
788 skb = alloc_skb(size + 16, GFP_ATOMIC);
789 if (skb == NULL)
790 return ERR_PTR(-ENOBUFS);
791
792 /* call should fill header later */
793 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
794 memset(hdr, 0, size); /* XXX do we need this ? */
795 hdr->sadb_msg_len = size / sizeof(uint64_t);
796
797 /* sa */
798 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
799 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
800 sa->sadb_sa_exttype = SADB_EXT_SA;
801 sa->sadb_sa_spi = x->id.spi;
802 sa->sadb_sa_replay = x->props.replay_window;
803 switch (x->km.state) {
804 case XFRM_STATE_VALID:
805 sa->sadb_sa_state = x->km.dying ?
806 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
807 break;
808 case XFRM_STATE_ACQ:
809 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
810 break;
811 default:
812 sa->sadb_sa_state = SADB_SASTATE_DEAD;
813 break;
814 }
815 sa->sadb_sa_auth = 0;
816 if (x->aalg) {
817 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
818 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
819 a->desc.sadb_alg_id : 0;
820 }
821 sa->sadb_sa_encrypt = 0;
822 BUG_ON(x->ealg && x->calg);
823 if (x->ealg) {
824 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
825 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
826 a->desc.sadb_alg_id : 0;
827 }
828 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
829 if (x->calg) {
830 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
831 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
832 a->desc.sadb_alg_id : 0;
833 }
834
835 sa->sadb_sa_flags = 0;
836 if (x->props.flags & XFRM_STATE_NOECN)
837 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
838 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
839 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
840 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
841 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
842
843 /* hard time */
844 if (hsc & 2) {
845 lifetime = (struct sadb_lifetime *) skb_put(skb,
846 sizeof(struct sadb_lifetime));
847 lifetime->sadb_lifetime_len =
848 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
849 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
850 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
851 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
852 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
853 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
854 }
855 /* soft time */
856 if (hsc & 1) {
857 lifetime = (struct sadb_lifetime *) skb_put(skb,
858 sizeof(struct sadb_lifetime));
859 lifetime->sadb_lifetime_len =
860 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
861 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
862 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
863 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
864 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
865 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
866 }
867 /* current time */
868 lifetime = (struct sadb_lifetime *) skb_put(skb,
869 sizeof(struct sadb_lifetime));
870 lifetime->sadb_lifetime_len =
871 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
872 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
873 lifetime->sadb_lifetime_allocations = x->curlft.packets;
874 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
875 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
876 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
877 /* src address */
878 addr = (struct sadb_address*) skb_put(skb,
879 sizeof(struct sadb_address)+sockaddr_size);
880 addr->sadb_address_len =
881 (sizeof(struct sadb_address)+sockaddr_size)/
882 sizeof(uint64_t);
883 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
884 /* "if the ports are non-zero, then the sadb_address_proto field,
885 normally zero, MUST be filled in with the transport
886 protocol's number." - RFC2367 */
887 addr->sadb_address_proto = 0;
888 addr->sadb_address_reserved = 0;
889
890 addr->sadb_address_prefixlen =
891 pfkey_sockaddr_fill(&x->props.saddr, 0,
892 (struct sockaddr *) (addr + 1),
893 x->props.family);
894 if (!addr->sadb_address_prefixlen)
895 BUG();
896
897 /* dst address */
898 addr = (struct sadb_address*) skb_put(skb,
899 sizeof(struct sadb_address)+sockaddr_size);
900 addr->sadb_address_len =
901 (sizeof(struct sadb_address)+sockaddr_size)/
902 sizeof(uint64_t);
903 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
904 addr->sadb_address_proto = 0;
905 addr->sadb_address_reserved = 0;
906
907 addr->sadb_address_prefixlen =
908 pfkey_sockaddr_fill(&x->id.daddr, 0,
909 (struct sockaddr *) (addr + 1),
910 x->props.family);
911 if (!addr->sadb_address_prefixlen)
912 BUG();
913
914 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
915 x->props.family)) {
916 addr = (struct sadb_address*) skb_put(skb,
917 sizeof(struct sadb_address)+sockaddr_size);
918 addr->sadb_address_len =
919 (sizeof(struct sadb_address)+sockaddr_size)/
920 sizeof(uint64_t);
921 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
922 addr->sadb_address_proto =
923 pfkey_proto_from_xfrm(x->sel.proto);
924 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
925 addr->sadb_address_reserved = 0;
926
927 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
928 (struct sockaddr *) (addr + 1),
929 x->props.family);
930 }
931
932 /* auth key */
933 if (add_keys && auth_key_size) {
934 key = (struct sadb_key *) skb_put(skb,
935 sizeof(struct sadb_key)+auth_key_size);
936 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
937 sizeof(uint64_t);
938 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
939 key->sadb_key_bits = x->aalg->alg_key_len;
940 key->sadb_key_reserved = 0;
941 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
942 }
943 /* encrypt key */
944 if (add_keys && encrypt_key_size) {
945 key = (struct sadb_key *) skb_put(skb,
946 sizeof(struct sadb_key)+encrypt_key_size);
947 key->sadb_key_len = (sizeof(struct sadb_key) +
948 encrypt_key_size) / sizeof(uint64_t);
949 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
950 key->sadb_key_bits = x->ealg->alg_key_len;
951 key->sadb_key_reserved = 0;
952 memcpy(key + 1, x->ealg->alg_key,
953 (x->ealg->alg_key_len+7)/8);
954 }
955
956 /* sa */
957 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
958 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
959 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
960 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
961 kfree_skb(skb);
962 return ERR_PTR(-EINVAL);
963 }
964 sa2->sadb_x_sa2_mode = mode;
965 sa2->sadb_x_sa2_reserved1 = 0;
966 sa2->sadb_x_sa2_reserved2 = 0;
967 sa2->sadb_x_sa2_sequence = 0;
968 sa2->sadb_x_sa2_reqid = x->props.reqid;
969
970 if (natt && natt->encap_type) {
971 struct sadb_x_nat_t_type *n_type;
972 struct sadb_x_nat_t_port *n_port;
973
974 /* type */
975 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
976 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
977 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
978 n_type->sadb_x_nat_t_type_type = natt->encap_type;
979 n_type->sadb_x_nat_t_type_reserved[0] = 0;
980 n_type->sadb_x_nat_t_type_reserved[1] = 0;
981 n_type->sadb_x_nat_t_type_reserved[2] = 0;
982
983 /* source port */
984 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
985 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
986 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
987 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
988 n_port->sadb_x_nat_t_port_reserved = 0;
989
990 /* dest port */
991 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
992 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
993 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
994 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
995 n_port->sadb_x_nat_t_port_reserved = 0;
996 }
997
998 /* security context */
999 if (xfrm_ctx) {
1000 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1001 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1002 sec_ctx->sadb_x_sec_len =
1003 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1004 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1005 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1006 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1007 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1008 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1009 xfrm_ctx->ctx_len);
1010 }
1011
1012 return skb;
1013 }
1014
1015
1016 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1017 {
1018 struct sk_buff *skb;
1019
1020 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1021
1022 return skb;
1023 }
1024
1025 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1026 int hsc)
1027 {
1028 return __pfkey_xfrm_state2msg(x, 0, hsc);
1029 }
1030
1031 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1032 const struct sadb_msg *hdr,
1033 void * const *ext_hdrs)
1034 {
1035 struct xfrm_state *x;
1036 const struct sadb_lifetime *lifetime;
1037 const struct sadb_sa *sa;
1038 const struct sadb_key *key;
1039 const struct sadb_x_sec_ctx *sec_ctx;
1040 uint16_t proto;
1041 int err;
1042
1043
1044 sa = ext_hdrs[SADB_EXT_SA - 1];
1045 if (!sa ||
1046 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1047 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1048 return ERR_PTR(-EINVAL);
1049 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1050 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1051 return ERR_PTR(-EINVAL);
1052 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1053 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1054 return ERR_PTR(-EINVAL);
1055 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1056 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1057 return ERR_PTR(-EINVAL);
1058
1059 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1060 if (proto == 0)
1061 return ERR_PTR(-EINVAL);
1062
1063 /* default error is no buffer space */
1064 err = -ENOBUFS;
1065
1066 /* RFC2367:
1067
1068 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1069 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1070 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1071 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1072 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1073 not true.
1074
1075 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1076 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1077 */
1078 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1079 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1080 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1081 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1082 return ERR_PTR(-EINVAL);
1083 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1084 if (key != NULL &&
1085 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1086 ((key->sadb_key_bits+7) / 8 == 0 ||
1087 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1088 return ERR_PTR(-EINVAL);
1089 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1090 if (key != NULL &&
1091 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1092 ((key->sadb_key_bits+7) / 8 == 0 ||
1093 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1094 return ERR_PTR(-EINVAL);
1095
1096 x = xfrm_state_alloc(net);
1097 if (x == NULL)
1098 return ERR_PTR(-ENOBUFS);
1099
1100 x->id.proto = proto;
1101 x->id.spi = sa->sadb_sa_spi;
1102 x->props.replay_window = sa->sadb_sa_replay;
1103 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1104 x->props.flags |= XFRM_STATE_NOECN;
1105 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1106 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1107 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1108 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1109
1110 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1111 if (lifetime != NULL) {
1112 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1113 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1114 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1115 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1116 }
1117 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1118 if (lifetime != NULL) {
1119 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1120 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1121 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1122 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1123 }
1124
1125 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126 if (sec_ctx != NULL) {
1127 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1128
1129 if (!uctx)
1130 goto out;
1131
1132 err = security_xfrm_state_alloc(x, uctx);
1133 kfree(uctx);
1134
1135 if (err)
1136 goto out;
1137 }
1138
1139 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1140 if (sa->sadb_sa_auth) {
1141 int keysize = 0;
1142 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143 if (!a || !a->pfkey_supported) {
1144 err = -ENOSYS;
1145 goto out;
1146 }
1147 if (key)
1148 keysize = (key->sadb_key_bits + 7) / 8;
1149 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1150 if (!x->aalg)
1151 goto out;
1152 strcpy(x->aalg->alg_name, a->name);
1153 x->aalg->alg_key_len = 0;
1154 if (key) {
1155 x->aalg->alg_key_len = key->sadb_key_bits;
1156 memcpy(x->aalg->alg_key, key+1, keysize);
1157 }
1158 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1159 x->props.aalgo = sa->sadb_sa_auth;
1160 /* x->algo.flags = sa->sadb_sa_flags; */
1161 }
1162 if (sa->sadb_sa_encrypt) {
1163 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1164 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1165 if (!a || !a->pfkey_supported) {
1166 err = -ENOSYS;
1167 goto out;
1168 }
1169 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1170 if (!x->calg)
1171 goto out;
1172 strcpy(x->calg->alg_name, a->name);
1173 x->props.calgo = sa->sadb_sa_encrypt;
1174 } else {
1175 int keysize = 0;
1176 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1177 if (!a || !a->pfkey_supported) {
1178 err = -ENOSYS;
1179 goto out;
1180 }
1181 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1182 if (key)
1183 keysize = (key->sadb_key_bits + 7) / 8;
1184 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1185 if (!x->ealg)
1186 goto out;
1187 strcpy(x->ealg->alg_name, a->name);
1188 x->ealg->alg_key_len = 0;
1189 if (key) {
1190 x->ealg->alg_key_len = key->sadb_key_bits;
1191 memcpy(x->ealg->alg_key, key+1, keysize);
1192 }
1193 x->props.ealgo = sa->sadb_sa_encrypt;
1194 }
1195 }
1196 /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199 &x->props.saddr);
1200 if (!x->props.family) {
1201 err = -EAFNOSUPPORT;
1202 goto out;
1203 }
1204 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1205 &x->id.daddr);
1206
1207 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1208 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1209 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1210 if (mode < 0) {
1211 err = -EINVAL;
1212 goto out;
1213 }
1214 x->props.mode = mode;
1215 x->props.reqid = sa2->sadb_x_sa2_reqid;
1216 }
1217
1218 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1219 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1220
1221 /* Nobody uses this, but we try. */
1222 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1223 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1224 }
1225
1226 if (!x->sel.family)
1227 x->sel.family = x->props.family;
1228
1229 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1230 const struct sadb_x_nat_t_type* n_type;
1231 struct xfrm_encap_tmpl *natt;
1232
1233 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1234 if (!x->encap)
1235 goto out;
1236
1237 natt = x->encap;
1238 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1239 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1240
1241 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1242 const struct sadb_x_nat_t_port *n_port =
1243 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1244 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1245 }
1246 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1247 const struct sadb_x_nat_t_port *n_port =
1248 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1249 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1250 }
1251 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1252 }
1253
1254 err = xfrm_init_state(x);
1255 if (err)
1256 goto out;
1257
1258 x->km.seq = hdr->sadb_msg_seq;
1259 return x;
1260
1261 out:
1262 x->km.state = XFRM_STATE_DEAD;
1263 xfrm_state_put(x);
1264 return ERR_PTR(err);
1265 }
1266
1267 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1268 {
1269 return -EOPNOTSUPP;
1270 }
1271
1272 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1273 {
1274 struct net *net = sock_net(sk);
1275 struct sk_buff *resp_skb;
1276 struct sadb_x_sa2 *sa2;
1277 struct sadb_address *saddr, *daddr;
1278 struct sadb_msg *out_hdr;
1279 struct sadb_spirange *range;
1280 struct xfrm_state *x = NULL;
1281 int mode;
1282 int err;
1283 u32 min_spi, max_spi;
1284 u32 reqid;
1285 u8 proto;
1286 unsigned short family;
1287 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1288
1289 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1290 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1291 return -EINVAL;
1292
1293 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1294 if (proto == 0)
1295 return -EINVAL;
1296
1297 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1298 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1299 if (mode < 0)
1300 return -EINVAL;
1301 reqid = sa2->sadb_x_sa2_reqid;
1302 } else {
1303 mode = 0;
1304 reqid = 0;
1305 }
1306
1307 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1308 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1309
1310 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1311 switch (family) {
1312 case AF_INET:
1313 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1314 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1315 break;
1316 #if IS_ENABLED(CONFIG_IPV6)
1317 case AF_INET6:
1318 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1319 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1320 break;
1321 #endif
1322 }
1323
1324 if (hdr->sadb_msg_seq) {
1325 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1326 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1327 xfrm_state_put(x);
1328 x = NULL;
1329 }
1330 }
1331
1332 if (!x)
1333 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1334
1335 if (x == NULL)
1336 return -ENOENT;
1337
1338 min_spi = 0x100;
1339 max_spi = 0x0fffffff;
1340
1341 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1342 if (range) {
1343 min_spi = range->sadb_spirange_min;
1344 max_spi = range->sadb_spirange_max;
1345 }
1346
1347 err = xfrm_alloc_spi(x, min_spi, max_spi);
1348 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1349
1350 if (IS_ERR(resp_skb)) {
1351 xfrm_state_put(x);
1352 return PTR_ERR(resp_skb);
1353 }
1354
1355 out_hdr = (struct sadb_msg *) resp_skb->data;
1356 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1357 out_hdr->sadb_msg_type = SADB_GETSPI;
1358 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1359 out_hdr->sadb_msg_errno = 0;
1360 out_hdr->sadb_msg_reserved = 0;
1361 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1362 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1363
1364 xfrm_state_put(x);
1365
1366 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1367
1368 return 0;
1369 }
1370
1371 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1372 {
1373 struct net *net = sock_net(sk);
1374 struct xfrm_state *x;
1375
1376 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1377 return -EOPNOTSUPP;
1378
1379 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1380 return 0;
1381
1382 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1383 if (x == NULL)
1384 return 0;
1385
1386 spin_lock_bh(&x->lock);
1387 if (x->km.state == XFRM_STATE_ACQ) {
1388 x->km.state = XFRM_STATE_ERROR;
1389 wake_up(&net->xfrm.km_waitq);
1390 }
1391 spin_unlock_bh(&x->lock);
1392 xfrm_state_put(x);
1393 return 0;
1394 }
1395
1396 static inline int event2poltype(int event)
1397 {
1398 switch (event) {
1399 case XFRM_MSG_DELPOLICY:
1400 return SADB_X_SPDDELETE;
1401 case XFRM_MSG_NEWPOLICY:
1402 return SADB_X_SPDADD;
1403 case XFRM_MSG_UPDPOLICY:
1404 return SADB_X_SPDUPDATE;
1405 case XFRM_MSG_POLEXPIRE:
1406 // return SADB_X_SPDEXPIRE;
1407 default:
1408 pr_err("pfkey: Unknown policy event %d\n", event);
1409 break;
1410 }
1411
1412 return 0;
1413 }
1414
1415 static inline int event2keytype(int event)
1416 {
1417 switch (event) {
1418 case XFRM_MSG_DELSA:
1419 return SADB_DELETE;
1420 case XFRM_MSG_NEWSA:
1421 return SADB_ADD;
1422 case XFRM_MSG_UPDSA:
1423 return SADB_UPDATE;
1424 case XFRM_MSG_EXPIRE:
1425 return SADB_EXPIRE;
1426 default:
1427 pr_err("pfkey: Unknown SA event %d\n", event);
1428 break;
1429 }
1430
1431 return 0;
1432 }
1433
1434 /* ADD/UPD/DEL */
1435 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1436 {
1437 struct sk_buff *skb;
1438 struct sadb_msg *hdr;
1439
1440 skb = pfkey_xfrm_state2msg(x);
1441
1442 if (IS_ERR(skb))
1443 return PTR_ERR(skb);
1444
1445 hdr = (struct sadb_msg *) skb->data;
1446 hdr->sadb_msg_version = PF_KEY_V2;
1447 hdr->sadb_msg_type = event2keytype(c->event);
1448 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1449 hdr->sadb_msg_errno = 0;
1450 hdr->sadb_msg_reserved = 0;
1451 hdr->sadb_msg_seq = c->seq;
1452 hdr->sadb_msg_pid = c->portid;
1453
1454 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1455
1456 return 0;
1457 }
1458
1459 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1460 {
1461 struct net *net = sock_net(sk);
1462 struct xfrm_state *x;
1463 int err;
1464 struct km_event c;
1465
1466 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1467 if (IS_ERR(x))
1468 return PTR_ERR(x);
1469
1470 xfrm_state_hold(x);
1471 if (hdr->sadb_msg_type == SADB_ADD)
1472 err = xfrm_state_add(x);
1473 else
1474 err = xfrm_state_update(x);
1475
1476 xfrm_audit_state_add(x, err ? 0 : 1,
1477 audit_get_loginuid(current),
1478 audit_get_sessionid(current), 0);
1479
1480 if (err < 0) {
1481 x->km.state = XFRM_STATE_DEAD;
1482 __xfrm_state_put(x);
1483 goto out;
1484 }
1485
1486 if (hdr->sadb_msg_type == SADB_ADD)
1487 c.event = XFRM_MSG_NEWSA;
1488 else
1489 c.event = XFRM_MSG_UPDSA;
1490 c.seq = hdr->sadb_msg_seq;
1491 c.portid = hdr->sadb_msg_pid;
1492 km_state_notify(x, &c);
1493 out:
1494 xfrm_state_put(x);
1495 return err;
1496 }
1497
1498 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1499 {
1500 struct net *net = sock_net(sk);
1501 struct xfrm_state *x;
1502 struct km_event c;
1503 int err;
1504
1505 if (!ext_hdrs[SADB_EXT_SA-1] ||
1506 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1507 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1508 return -EINVAL;
1509
1510 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1511 if (x == NULL)
1512 return -ESRCH;
1513
1514 if ((err = security_xfrm_state_delete(x)))
1515 goto out;
1516
1517 if (xfrm_state_kern(x)) {
1518 err = -EPERM;
1519 goto out;
1520 }
1521
1522 err = xfrm_state_delete(x);
1523
1524 if (err < 0)
1525 goto out;
1526
1527 c.seq = hdr->sadb_msg_seq;
1528 c.portid = hdr->sadb_msg_pid;
1529 c.event = XFRM_MSG_DELSA;
1530 km_state_notify(x, &c);
1531 out:
1532 xfrm_audit_state_delete(x, err ? 0 : 1,
1533 audit_get_loginuid(current),
1534 audit_get_sessionid(current), 0);
1535 xfrm_state_put(x);
1536
1537 return err;
1538 }
1539
1540 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1541 {
1542 struct net *net = sock_net(sk);
1543 __u8 proto;
1544 struct sk_buff *out_skb;
1545 struct sadb_msg *out_hdr;
1546 struct xfrm_state *x;
1547
1548 if (!ext_hdrs[SADB_EXT_SA-1] ||
1549 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1550 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1551 return -EINVAL;
1552
1553 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1554 if (x == NULL)
1555 return -ESRCH;
1556
1557 out_skb = pfkey_xfrm_state2msg(x);
1558 proto = x->id.proto;
1559 xfrm_state_put(x);
1560 if (IS_ERR(out_skb))
1561 return PTR_ERR(out_skb);
1562
1563 out_hdr = (struct sadb_msg *) out_skb->data;
1564 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1565 out_hdr->sadb_msg_type = SADB_GET;
1566 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1567 out_hdr->sadb_msg_errno = 0;
1568 out_hdr->sadb_msg_reserved = 0;
1569 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1570 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1571 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1572
1573 return 0;
1574 }
1575
1576 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1577 gfp_t allocation)
1578 {
1579 struct sk_buff *skb;
1580 struct sadb_msg *hdr;
1581 int len, auth_len, enc_len, i;
1582
1583 auth_len = xfrm_count_pfkey_auth_supported();
1584 if (auth_len) {
1585 auth_len *= sizeof(struct sadb_alg);
1586 auth_len += sizeof(struct sadb_supported);
1587 }
1588
1589 enc_len = xfrm_count_pfkey_enc_supported();
1590 if (enc_len) {
1591 enc_len *= sizeof(struct sadb_alg);
1592 enc_len += sizeof(struct sadb_supported);
1593 }
1594
1595 len = enc_len + auth_len + sizeof(struct sadb_msg);
1596
1597 skb = alloc_skb(len + 16, allocation);
1598 if (!skb)
1599 goto out_put_algs;
1600
1601 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1602 pfkey_hdr_dup(hdr, orig);
1603 hdr->sadb_msg_errno = 0;
1604 hdr->sadb_msg_len = len / sizeof(uint64_t);
1605
1606 if (auth_len) {
1607 struct sadb_supported *sp;
1608 struct sadb_alg *ap;
1609
1610 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1611 ap = (struct sadb_alg *) (sp + 1);
1612
1613 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1614 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1615
1616 for (i = 0; ; i++) {
1617 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1618 if (!aalg)
1619 break;
1620 if (!aalg->pfkey_supported)
1621 continue;
1622 if (aalg->available)
1623 *ap++ = aalg->desc;
1624 }
1625 }
1626
1627 if (enc_len) {
1628 struct sadb_supported *sp;
1629 struct sadb_alg *ap;
1630
1631 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1632 ap = (struct sadb_alg *) (sp + 1);
1633
1634 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1635 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1636
1637 for (i = 0; ; i++) {
1638 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1639 if (!ealg)
1640 break;
1641 if (!ealg->pfkey_supported)
1642 continue;
1643 if (ealg->available)
1644 *ap++ = ealg->desc;
1645 }
1646 }
1647
1648 out_put_algs:
1649 return skb;
1650 }
1651
1652 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1653 {
1654 struct pfkey_sock *pfk = pfkey_sk(sk);
1655 struct sk_buff *supp_skb;
1656
1657 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1658 return -EINVAL;
1659
1660 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1661 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1662 return -EEXIST;
1663 pfk->registered |= (1<<hdr->sadb_msg_satype);
1664 }
1665
1666 xfrm_probe_algs();
1667
1668 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1669 if (!supp_skb) {
1670 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1671 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1672
1673 return -ENOBUFS;
1674 }
1675
1676 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1677
1678 return 0;
1679 }
1680
1681 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1682 {
1683 struct sk_buff *skb;
1684 struct sadb_msg *hdr;
1685
1686 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1687 if (!skb)
1688 return -ENOBUFS;
1689
1690 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1691 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1692 hdr->sadb_msg_errno = (uint8_t) 0;
1693 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1694
1695 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1696 }
1697
1698 static int key_notify_sa_flush(const struct km_event *c)
1699 {
1700 struct sk_buff *skb;
1701 struct sadb_msg *hdr;
1702
1703 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1704 if (!skb)
1705 return -ENOBUFS;
1706 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1707 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1708 hdr->sadb_msg_type = SADB_FLUSH;
1709 hdr->sadb_msg_seq = c->seq;
1710 hdr->sadb_msg_pid = c->portid;
1711 hdr->sadb_msg_version = PF_KEY_V2;
1712 hdr->sadb_msg_errno = (uint8_t) 0;
1713 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1714
1715 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716
1717 return 0;
1718 }
1719
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722 struct net *net = sock_net(sk);
1723 unsigned int proto;
1724 struct km_event c;
1725 struct xfrm_audit audit_info;
1726 int err, err2;
1727
1728 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729 if (proto == 0)
1730 return -EINVAL;
1731
1732 audit_info.loginuid = audit_get_loginuid(current);
1733 audit_info.sessionid = audit_get_sessionid(current);
1734 audit_info.secid = 0;
1735 err = xfrm_state_flush(net, proto, &audit_info);
1736 err2 = unicast_flush_resp(sk, hdr);
1737 if (err || err2) {
1738 if (err == -ESRCH) /* empty table - go quietly */
1739 err = 0;
1740 return err ? err : err2;
1741 }
1742
1743 c.data.proto = proto;
1744 c.seq = hdr->sadb_msg_seq;
1745 c.portid = hdr->sadb_msg_pid;
1746 c.event = XFRM_MSG_FLUSHSA;
1747 c.net = net;
1748 km_state_notify(NULL, &c);
1749
1750 return 0;
1751 }
1752
1753 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1754 {
1755 struct pfkey_sock *pfk = ptr;
1756 struct sk_buff *out_skb;
1757 struct sadb_msg *out_hdr;
1758
1759 if (!pfkey_can_dump(&pfk->sk))
1760 return -ENOBUFS;
1761
1762 out_skb = pfkey_xfrm_state2msg(x);
1763 if (IS_ERR(out_skb))
1764 return PTR_ERR(out_skb);
1765
1766 out_hdr = (struct sadb_msg *) out_skb->data;
1767 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1768 out_hdr->sadb_msg_type = SADB_DUMP;
1769 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1770 out_hdr->sadb_msg_errno = 0;
1771 out_hdr->sadb_msg_reserved = 0;
1772 out_hdr->sadb_msg_seq = count + 1;
1773 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1774
1775 if (pfk->dump.skb)
1776 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1777 &pfk->sk, sock_net(&pfk->sk));
1778 pfk->dump.skb = out_skb;
1779
1780 return 0;
1781 }
1782
1783 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1784 {
1785 struct net *net = sock_net(&pfk->sk);
1786 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1787 }
1788
1789 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1790 {
1791 xfrm_state_walk_done(&pfk->dump.u.state);
1792 }
1793
1794 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1795 {
1796 u8 proto;
1797 struct pfkey_sock *pfk = pfkey_sk(sk);
1798
1799 if (pfk->dump.dump != NULL)
1800 return -EBUSY;
1801
1802 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1803 if (proto == 0)
1804 return -EINVAL;
1805
1806 pfk->dump.msg_version = hdr->sadb_msg_version;
1807 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1808 pfk->dump.dump = pfkey_dump_sa;
1809 pfk->dump.done = pfkey_dump_sa_done;
1810 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1811
1812 return pfkey_do_dump(pfk);
1813 }
1814
1815 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1816 {
1817 struct pfkey_sock *pfk = pfkey_sk(sk);
1818 int satype = hdr->sadb_msg_satype;
1819 bool reset_errno = false;
1820
1821 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1822 reset_errno = true;
1823 if (satype != 0 && satype != 1)
1824 return -EINVAL;
1825 pfk->promisc = satype;
1826 }
1827 if (reset_errno && skb_cloned(skb))
1828 skb = skb_copy(skb, GFP_KERNEL);
1829 else
1830 skb = skb_clone(skb, GFP_KERNEL);
1831
1832 if (reset_errno && skb) {
1833 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1834 new_hdr->sadb_msg_errno = 0;
1835 }
1836
1837 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1838 return 0;
1839 }
1840
1841 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1842 {
1843 int i;
1844 u32 reqid = *(u32*)ptr;
1845
1846 for (i=0; i<xp->xfrm_nr; i++) {
1847 if (xp->xfrm_vec[i].reqid == reqid)
1848 return -EEXIST;
1849 }
1850 return 0;
1851 }
1852
1853 static u32 gen_reqid(struct net *net)
1854 {
1855 struct xfrm_policy_walk walk;
1856 u32 start;
1857 int rc;
1858 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1859
1860 start = reqid;
1861 do {
1862 ++reqid;
1863 if (reqid == 0)
1864 reqid = IPSEC_MANUAL_REQID_MAX+1;
1865 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1866 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1867 xfrm_policy_walk_done(&walk);
1868 if (rc != -EEXIST)
1869 return reqid;
1870 } while (reqid != start);
1871 return 0;
1872 }
1873
1874 static int
1875 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1876 {
1877 struct net *net = xp_net(xp);
1878 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1879 int mode;
1880
1881 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1882 return -ELOOP;
1883
1884 if (rq->sadb_x_ipsecrequest_mode == 0)
1885 return -EINVAL;
1886
1887 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1888 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1889 return -EINVAL;
1890 t->mode = mode;
1891 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1892 t->optional = 1;
1893 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1894 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1895 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1896 t->reqid = 0;
1897 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1898 return -ENOBUFS;
1899 }
1900
1901 /* addresses present only in tunnel mode */
1902 if (t->mode == XFRM_MODE_TUNNEL) {
1903 u8 *sa = (u8 *) (rq + 1);
1904 int family, socklen;
1905
1906 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1907 &t->saddr);
1908 if (!family)
1909 return -EINVAL;
1910
1911 socklen = pfkey_sockaddr_len(family);
1912 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1913 &t->id.daddr) != family)
1914 return -EINVAL;
1915 t->encap_family = family;
1916 } else
1917 t->encap_family = xp->family;
1918
1919 /* No way to set this via kame pfkey */
1920 t->allalgs = 1;
1921 xp->xfrm_nr++;
1922 return 0;
1923 }
1924
1925 static int
1926 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1927 {
1928 int err;
1929 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1930 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1931
1932 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1933 return -EINVAL;
1934
1935 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1936 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1937 return err;
1938 len -= rq->sadb_x_ipsecrequest_len;
1939 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1940 }
1941 return 0;
1942 }
1943
1944 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1945 {
1946 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1947
1948 if (xfrm_ctx) {
1949 int len = sizeof(struct sadb_x_sec_ctx);
1950 len += xfrm_ctx->ctx_len;
1951 return PFKEY_ALIGN8(len);
1952 }
1953 return 0;
1954 }
1955
1956 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1957 {
1958 const struct xfrm_tmpl *t;
1959 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1960 int socklen = 0;
1961 int i;
1962
1963 for (i=0; i<xp->xfrm_nr; i++) {
1964 t = xp->xfrm_vec + i;
1965 socklen += pfkey_sockaddr_len(t->encap_family);
1966 }
1967
1968 return sizeof(struct sadb_msg) +
1969 (sizeof(struct sadb_lifetime) * 3) +
1970 (sizeof(struct sadb_address) * 2) +
1971 (sockaddr_size * 2) +
1972 sizeof(struct sadb_x_policy) +
1973 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1974 (socklen * 2) +
1975 pfkey_xfrm_policy2sec_ctx_size(xp);
1976 }
1977
1978 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1979 {
1980 struct sk_buff *skb;
1981 int size;
1982
1983 size = pfkey_xfrm_policy2msg_size(xp);
1984
1985 skb = alloc_skb(size + 16, GFP_ATOMIC);
1986 if (skb == NULL)
1987 return ERR_PTR(-ENOBUFS);
1988
1989 return skb;
1990 }
1991
1992 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1993 {
1994 struct sadb_msg *hdr;
1995 struct sadb_address *addr;
1996 struct sadb_lifetime *lifetime;
1997 struct sadb_x_policy *pol;
1998 struct sadb_x_sec_ctx *sec_ctx;
1999 struct xfrm_sec_ctx *xfrm_ctx;
2000 int i;
2001 int size;
2002 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2003 int socklen = pfkey_sockaddr_len(xp->family);
2004
2005 size = pfkey_xfrm_policy2msg_size(xp);
2006
2007 /* call should fill header later */
2008 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2009 memset(hdr, 0, size); /* XXX do we need this ? */
2010
2011 /* src address */
2012 addr = (struct sadb_address*) skb_put(skb,
2013 sizeof(struct sadb_address)+sockaddr_size);
2014 addr->sadb_address_len =
2015 (sizeof(struct sadb_address)+sockaddr_size)/
2016 sizeof(uint64_t);
2017 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2018 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2019 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2020 addr->sadb_address_reserved = 0;
2021 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2022 xp->selector.sport,
2023 (struct sockaddr *) (addr + 1),
2024 xp->family))
2025 BUG();
2026
2027 /* dst address */
2028 addr = (struct sadb_address*) skb_put(skb,
2029 sizeof(struct sadb_address)+sockaddr_size);
2030 addr->sadb_address_len =
2031 (sizeof(struct sadb_address)+sockaddr_size)/
2032 sizeof(uint64_t);
2033 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2034 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2035 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2036 addr->sadb_address_reserved = 0;
2037
2038 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2039 (struct sockaddr *) (addr + 1),
2040 xp->family);
2041
2042 /* hard time */
2043 lifetime = (struct sadb_lifetime *) skb_put(skb,
2044 sizeof(struct sadb_lifetime));
2045 lifetime->sadb_lifetime_len =
2046 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2048 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2049 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2050 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2051 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2052 /* soft time */
2053 lifetime = (struct sadb_lifetime *) skb_put(skb,
2054 sizeof(struct sadb_lifetime));
2055 lifetime->sadb_lifetime_len =
2056 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2057 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2058 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2059 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2060 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2061 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2062 /* current time */
2063 lifetime = (struct sadb_lifetime *) skb_put(skb,
2064 sizeof(struct sadb_lifetime));
2065 lifetime->sadb_lifetime_len =
2066 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2067 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2068 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2069 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2070 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2071 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2072
2073 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2074 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2075 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2076 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2077 if (xp->action == XFRM_POLICY_ALLOW) {
2078 if (xp->xfrm_nr)
2079 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2080 else
2081 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2082 }
2083 pol->sadb_x_policy_dir = dir+1;
2084 pol->sadb_x_policy_id = xp->index;
2085 pol->sadb_x_policy_priority = xp->priority;
2086
2087 for (i=0; i<xp->xfrm_nr; i++) {
2088 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2089 struct sadb_x_ipsecrequest *rq;
2090 int req_size;
2091 int mode;
2092
2093 req_size = sizeof(struct sadb_x_ipsecrequest);
2094 if (t->mode == XFRM_MODE_TUNNEL) {
2095 socklen = pfkey_sockaddr_len(t->encap_family);
2096 req_size += socklen * 2;
2097 } else {
2098 size -= 2*socklen;
2099 }
2100 rq = (void*)skb_put(skb, req_size);
2101 pol->sadb_x_policy_len += req_size/8;
2102 memset(rq, 0, sizeof(*rq));
2103 rq->sadb_x_ipsecrequest_len = req_size;
2104 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2105 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2106 return -EINVAL;
2107 rq->sadb_x_ipsecrequest_mode = mode;
2108 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2109 if (t->reqid)
2110 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2111 if (t->optional)
2112 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2113 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2114
2115 if (t->mode == XFRM_MODE_TUNNEL) {
2116 u8 *sa = (void *)(rq + 1);
2117 pfkey_sockaddr_fill(&t->saddr, 0,
2118 (struct sockaddr *)sa,
2119 t->encap_family);
2120 pfkey_sockaddr_fill(&t->id.daddr, 0,
2121 (struct sockaddr *) (sa + socklen),
2122 t->encap_family);
2123 }
2124 }
2125
2126 /* security context */
2127 if ((xfrm_ctx = xp->security)) {
2128 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2129
2130 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2131 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2132 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2133 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2134 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2135 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2136 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2137 xfrm_ctx->ctx_len);
2138 }
2139
2140 hdr->sadb_msg_len = size / sizeof(uint64_t);
2141 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2142
2143 return 0;
2144 }
2145
2146 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2147 {
2148 struct sk_buff *out_skb;
2149 struct sadb_msg *out_hdr;
2150 int err;
2151
2152 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2153 if (IS_ERR(out_skb))
2154 return PTR_ERR(out_skb);
2155
2156 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2157 if (err < 0)
2158 return err;
2159
2160 out_hdr = (struct sadb_msg *) out_skb->data;
2161 out_hdr->sadb_msg_version = PF_KEY_V2;
2162
2163 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2164 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2165 else
2166 out_hdr->sadb_msg_type = event2poltype(c->event);
2167 out_hdr->sadb_msg_errno = 0;
2168 out_hdr->sadb_msg_seq = c->seq;
2169 out_hdr->sadb_msg_pid = c->portid;
2170 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2171 return 0;
2172
2173 }
2174
2175 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2176 {
2177 struct net *net = sock_net(sk);
2178 int err = 0;
2179 struct sadb_lifetime *lifetime;
2180 struct sadb_address *sa;
2181 struct sadb_x_policy *pol;
2182 struct xfrm_policy *xp;
2183 struct km_event c;
2184 struct sadb_x_sec_ctx *sec_ctx;
2185
2186 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2188 !ext_hdrs[SADB_X_EXT_POLICY-1])
2189 return -EINVAL;
2190
2191 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2192 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2193 return -EINVAL;
2194 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2195 return -EINVAL;
2196
2197 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2198 if (xp == NULL)
2199 return -ENOBUFS;
2200
2201 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2202 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2203 xp->priority = pol->sadb_x_policy_priority;
2204
2205 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2206 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2207 if (!xp->family) {
2208 err = -EINVAL;
2209 goto out;
2210 }
2211 xp->selector.family = xp->family;
2212 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2213 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2214 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2215 if (xp->selector.sport)
2216 xp->selector.sport_mask = htons(0xffff);
2217
2218 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2219 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2220 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2221
2222 /* Amusing, we set this twice. KAME apps appear to set same value
2223 * in both addresses.
2224 */
2225 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226
2227 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2228 if (xp->selector.dport)
2229 xp->selector.dport_mask = htons(0xffff);
2230
2231 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2232 if (sec_ctx != NULL) {
2233 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2234
2235 if (!uctx) {
2236 err = -ENOBUFS;
2237 goto out;
2238 }
2239
2240 err = security_xfrm_policy_alloc(&xp->security, uctx);
2241 kfree(uctx);
2242
2243 if (err)
2244 goto out;
2245 }
2246
2247 xp->lft.soft_byte_limit = XFRM_INF;
2248 xp->lft.hard_byte_limit = XFRM_INF;
2249 xp->lft.soft_packet_limit = XFRM_INF;
2250 xp->lft.hard_packet_limit = XFRM_INF;
2251 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2252 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256 }
2257 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2258 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2259 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2260 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2261 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2262 }
2263 xp->xfrm_nr = 0;
2264 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2265 (err = parse_ipsecrequests(xp, pol)) < 0)
2266 goto out;
2267
2268 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2269 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2270
2271 xfrm_audit_policy_add(xp, err ? 0 : 1,
2272 audit_get_loginuid(current),
2273 audit_get_sessionid(current), 0);
2274
2275 if (err)
2276 goto out;
2277
2278 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2279 c.event = XFRM_MSG_UPDPOLICY;
2280 else
2281 c.event = XFRM_MSG_NEWPOLICY;
2282
2283 c.seq = hdr->sadb_msg_seq;
2284 c.portid = hdr->sadb_msg_pid;
2285
2286 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2287 xfrm_pol_put(xp);
2288 return 0;
2289
2290 out:
2291 xp->walk.dead = 1;
2292 xfrm_policy_destroy(xp);
2293 return err;
2294 }
2295
2296 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2297 {
2298 struct net *net = sock_net(sk);
2299 int err;
2300 struct sadb_address *sa;
2301 struct sadb_x_policy *pol;
2302 struct xfrm_policy *xp;
2303 struct xfrm_selector sel;
2304 struct km_event c;
2305 struct sadb_x_sec_ctx *sec_ctx;
2306 struct xfrm_sec_ctx *pol_ctx = NULL;
2307
2308 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2309 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2310 !ext_hdrs[SADB_X_EXT_POLICY-1])
2311 return -EINVAL;
2312
2313 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2314 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2315 return -EINVAL;
2316
2317 memset(&sel, 0, sizeof(sel));
2318
2319 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2320 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2321 sel.prefixlen_s = sa->sadb_address_prefixlen;
2322 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2323 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2324 if (sel.sport)
2325 sel.sport_mask = htons(0xffff);
2326
2327 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2328 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2329 sel.prefixlen_d = sa->sadb_address_prefixlen;
2330 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332 if (sel.dport)
2333 sel.dport_mask = htons(0xffff);
2334
2335 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2336 if (sec_ctx != NULL) {
2337 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2338
2339 if (!uctx)
2340 return -ENOMEM;
2341
2342 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2343 kfree(uctx);
2344 if (err)
2345 return err;
2346 }
2347
2348 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2349 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2350 1, &err);
2351 security_xfrm_policy_free(pol_ctx);
2352 if (xp == NULL)
2353 return -ENOENT;
2354
2355 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2356 audit_get_loginuid(current),
2357 audit_get_sessionid(current), 0);
2358
2359 if (err)
2360 goto out;
2361
2362 c.seq = hdr->sadb_msg_seq;
2363 c.portid = hdr->sadb_msg_pid;
2364 c.data.byid = 0;
2365 c.event = XFRM_MSG_DELPOLICY;
2366 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367
2368 out:
2369 xfrm_pol_put(xp);
2370 return err;
2371 }
2372
2373 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2374 {
2375 int err;
2376 struct sk_buff *out_skb;
2377 struct sadb_msg *out_hdr;
2378 err = 0;
2379
2380 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2381 if (IS_ERR(out_skb)) {
2382 err = PTR_ERR(out_skb);
2383 goto out;
2384 }
2385 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2386 if (err < 0)
2387 goto out;
2388
2389 out_hdr = (struct sadb_msg *) out_skb->data;
2390 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2391 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2392 out_hdr->sadb_msg_satype = 0;
2393 out_hdr->sadb_msg_errno = 0;
2394 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2395 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2396 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2397 err = 0;
2398
2399 out:
2400 return err;
2401 }
2402
2403 #ifdef CONFIG_NET_KEY_MIGRATE
2404 static int pfkey_sockaddr_pair_size(sa_family_t family)
2405 {
2406 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2407 }
2408
2409 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2410 xfrm_address_t *saddr, xfrm_address_t *daddr,
2411 u16 *family)
2412 {
2413 int af, socklen;
2414
2415 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2416 return -EINVAL;
2417
2418 af = pfkey_sockaddr_extract(sa, saddr);
2419 if (!af)
2420 return -EINVAL;
2421
2422 socklen = pfkey_sockaddr_len(af);
2423 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2424 daddr) != af)
2425 return -EINVAL;
2426
2427 *family = af;
2428 return 0;
2429 }
2430
2431 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2432 struct xfrm_migrate *m)
2433 {
2434 int err;
2435 struct sadb_x_ipsecrequest *rq2;
2436 int mode;
2437
2438 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2439 len < rq1->sadb_x_ipsecrequest_len)
2440 return -EINVAL;
2441
2442 /* old endoints */
2443 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2444 rq1->sadb_x_ipsecrequest_len,
2445 &m->old_saddr, &m->old_daddr,
2446 &m->old_family);
2447 if (err)
2448 return err;
2449
2450 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2451 len -= rq1->sadb_x_ipsecrequest_len;
2452
2453 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2454 len < rq2->sadb_x_ipsecrequest_len)
2455 return -EINVAL;
2456
2457 /* new endpoints */
2458 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2459 rq2->sadb_x_ipsecrequest_len,
2460 &m->new_saddr, &m->new_daddr,
2461 &m->new_family);
2462 if (err)
2463 return err;
2464
2465 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2466 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2467 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2468 return -EINVAL;
2469
2470 m->proto = rq1->sadb_x_ipsecrequest_proto;
2471 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2472 return -EINVAL;
2473 m->mode = mode;
2474 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2475
2476 return ((int)(rq1->sadb_x_ipsecrequest_len +
2477 rq2->sadb_x_ipsecrequest_len));
2478 }
2479
2480 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2481 const struct sadb_msg *hdr, void * const *ext_hdrs)
2482 {
2483 int i, len, ret, err = -EINVAL;
2484 u8 dir;
2485 struct sadb_address *sa;
2486 struct sadb_x_kmaddress *kma;
2487 struct sadb_x_policy *pol;
2488 struct sadb_x_ipsecrequest *rq;
2489 struct xfrm_selector sel;
2490 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2491 struct xfrm_kmaddress k;
2492
2493 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2494 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2495 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2496 err = -EINVAL;
2497 goto out;
2498 }
2499
2500 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2501 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2502
2503 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2504 err = -EINVAL;
2505 goto out;
2506 }
2507
2508 if (kma) {
2509 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2510 k.reserved = kma->sadb_x_kmaddress_reserved;
2511 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2512 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2513 &k.local, &k.remote, &k.family);
2514 if (ret < 0) {
2515 err = ret;
2516 goto out;
2517 }
2518 }
2519
2520 dir = pol->sadb_x_policy_dir - 1;
2521 memset(&sel, 0, sizeof(sel));
2522
2523 /* set source address info of selector */
2524 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2525 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2526 sel.prefixlen_s = sa->sadb_address_prefixlen;
2527 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2528 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2529 if (sel.sport)
2530 sel.sport_mask = htons(0xffff);
2531
2532 /* set destination address info of selector */
2533 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2534 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2535 sel.prefixlen_d = sa->sadb_address_prefixlen;
2536 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2537 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2538 if (sel.dport)
2539 sel.dport_mask = htons(0xffff);
2540
2541 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2542
2543 /* extract ipsecrequests */
2544 i = 0;
2545 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2546
2547 while (len > 0 && i < XFRM_MAX_DEPTH) {
2548 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2549 if (ret < 0) {
2550 err = ret;
2551 goto out;
2552 } else {
2553 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2554 len -= ret;
2555 i++;
2556 }
2557 }
2558
2559 if (!i || len > 0) {
2560 err = -EINVAL;
2561 goto out;
2562 }
2563
2564 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2565 kma ? &k : NULL);
2566
2567 out:
2568 return err;
2569 }
2570 #else
2571 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2572 const struct sadb_msg *hdr, void * const *ext_hdrs)
2573 {
2574 return -ENOPROTOOPT;
2575 }
2576 #endif
2577
2578
2579 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2580 {
2581 struct net *net = sock_net(sk);
2582 unsigned int dir;
2583 int err = 0, delete;
2584 struct sadb_x_policy *pol;
2585 struct xfrm_policy *xp;
2586 struct km_event c;
2587
2588 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2589 return -EINVAL;
2590
2591 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2592 if (dir >= XFRM_POLICY_MAX)
2593 return -EINVAL;
2594
2595 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2596 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2597 dir, pol->sadb_x_policy_id, delete, &err);
2598 if (xp == NULL)
2599 return -ENOENT;
2600
2601 if (delete) {
2602 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2603 audit_get_loginuid(current),
2604 audit_get_sessionid(current), 0);
2605
2606 if (err)
2607 goto out;
2608 c.seq = hdr->sadb_msg_seq;
2609 c.portid = hdr->sadb_msg_pid;
2610 c.data.byid = 1;
2611 c.event = XFRM_MSG_DELPOLICY;
2612 km_policy_notify(xp, dir, &c);
2613 } else {
2614 err = key_pol_get_resp(sk, xp, hdr, dir);
2615 }
2616
2617 out:
2618 xfrm_pol_put(xp);
2619 return err;
2620 }
2621
2622 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2623 {
2624 struct pfkey_sock *pfk = ptr;
2625 struct sk_buff *out_skb;
2626 struct sadb_msg *out_hdr;
2627 int err;
2628
2629 if (!pfkey_can_dump(&pfk->sk))
2630 return -ENOBUFS;
2631
2632 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2633 if (IS_ERR(out_skb))
2634 return PTR_ERR(out_skb);
2635
2636 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2637 if (err < 0)
2638 return err;
2639
2640 out_hdr = (struct sadb_msg *) out_skb->data;
2641 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2642 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2643 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2644 out_hdr->sadb_msg_errno = 0;
2645 out_hdr->sadb_msg_seq = count + 1;
2646 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2647
2648 if (pfk->dump.skb)
2649 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2650 &pfk->sk, sock_net(&pfk->sk));
2651 pfk->dump.skb = out_skb;
2652
2653 return 0;
2654 }
2655
2656 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2657 {
2658 struct net *net = sock_net(&pfk->sk);
2659 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2660 }
2661
2662 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2663 {
2664 xfrm_policy_walk_done(&pfk->dump.u.policy);
2665 }
2666
2667 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2668 {
2669 struct pfkey_sock *pfk = pfkey_sk(sk);
2670
2671 if (pfk->dump.dump != NULL)
2672 return -EBUSY;
2673
2674 pfk->dump.msg_version = hdr->sadb_msg_version;
2675 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2676 pfk->dump.dump = pfkey_dump_sp;
2677 pfk->dump.done = pfkey_dump_sp_done;
2678 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2679
2680 return pfkey_do_dump(pfk);
2681 }
2682
2683 static int key_notify_policy_flush(const struct km_event *c)
2684 {
2685 struct sk_buff *skb_out;
2686 struct sadb_msg *hdr;
2687
2688 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2689 if (!skb_out)
2690 return -ENOBUFS;
2691 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2692 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2693 hdr->sadb_msg_seq = c->seq;
2694 hdr->sadb_msg_pid = c->portid;
2695 hdr->sadb_msg_version = PF_KEY_V2;
2696 hdr->sadb_msg_errno = (uint8_t) 0;
2697 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2698 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2699 return 0;
2700
2701 }
2702
2703 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2704 {
2705 struct net *net = sock_net(sk);
2706 struct km_event c;
2707 struct xfrm_audit audit_info;
2708 int err, err2;
2709
2710 audit_info.loginuid = audit_get_loginuid(current);
2711 audit_info.sessionid = audit_get_sessionid(current);
2712 audit_info.secid = 0;
2713 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2714 err2 = unicast_flush_resp(sk, hdr);
2715 if (err || err2) {
2716 if (err == -ESRCH) /* empty table - old silent behavior */
2717 return 0;
2718 return err;
2719 }
2720
2721 c.data.type = XFRM_POLICY_TYPE_MAIN;
2722 c.event = XFRM_MSG_FLUSHPOLICY;
2723 c.portid = hdr->sadb_msg_pid;
2724 c.seq = hdr->sadb_msg_seq;
2725 c.net = net;
2726 km_policy_notify(NULL, 0, &c);
2727
2728 return 0;
2729 }
2730
2731 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2732 const struct sadb_msg *hdr, void * const *ext_hdrs);
2733 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2734 [SADB_RESERVED] = pfkey_reserved,
2735 [SADB_GETSPI] = pfkey_getspi,
2736 [SADB_UPDATE] = pfkey_add,
2737 [SADB_ADD] = pfkey_add,
2738 [SADB_DELETE] = pfkey_delete,
2739 [SADB_GET] = pfkey_get,
2740 [SADB_ACQUIRE] = pfkey_acquire,
2741 [SADB_REGISTER] = pfkey_register,
2742 [SADB_EXPIRE] = NULL,
2743 [SADB_FLUSH] = pfkey_flush,
2744 [SADB_DUMP] = pfkey_dump,
2745 [SADB_X_PROMISC] = pfkey_promisc,
2746 [SADB_X_PCHANGE] = NULL,
2747 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2748 [SADB_X_SPDADD] = pfkey_spdadd,
2749 [SADB_X_SPDDELETE] = pfkey_spddelete,
2750 [SADB_X_SPDGET] = pfkey_spdget,
2751 [SADB_X_SPDACQUIRE] = NULL,
2752 [SADB_X_SPDDUMP] = pfkey_spddump,
2753 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2754 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2755 [SADB_X_SPDDELETE2] = pfkey_spdget,
2756 [SADB_X_MIGRATE] = pfkey_migrate,
2757 };
2758
2759 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2760 {
2761 void *ext_hdrs[SADB_EXT_MAX];
2762 int err;
2763
2764 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2765 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2766
2767 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2768 err = parse_exthdrs(skb, hdr, ext_hdrs);
2769 if (!err) {
2770 err = -EOPNOTSUPP;
2771 if (pfkey_funcs[hdr->sadb_msg_type])
2772 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2773 }
2774 return err;
2775 }
2776
2777 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2778 {
2779 struct sadb_msg *hdr = NULL;
2780
2781 if (skb->len < sizeof(*hdr)) {
2782 *errp = -EMSGSIZE;
2783 } else {
2784 hdr = (struct sadb_msg *) skb->data;
2785 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2786 hdr->sadb_msg_reserved != 0 ||
2787 (hdr->sadb_msg_type <= SADB_RESERVED ||
2788 hdr->sadb_msg_type > SADB_MAX)) {
2789 hdr = NULL;
2790 *errp = -EINVAL;
2791 } else if (hdr->sadb_msg_len != (skb->len /
2792 sizeof(uint64_t)) ||
2793 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2794 sizeof(uint64_t))) {
2795 hdr = NULL;
2796 *errp = -EMSGSIZE;
2797 } else {
2798 *errp = 0;
2799 }
2800 }
2801 return hdr;
2802 }
2803
2804 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2805 const struct xfrm_algo_desc *d)
2806 {
2807 unsigned int id = d->desc.sadb_alg_id;
2808
2809 if (id >= sizeof(t->aalgos) * 8)
2810 return 0;
2811
2812 return (t->aalgos >> id) & 1;
2813 }
2814
2815 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2816 const struct xfrm_algo_desc *d)
2817 {
2818 unsigned int id = d->desc.sadb_alg_id;
2819
2820 if (id >= sizeof(t->ealgos) * 8)
2821 return 0;
2822
2823 return (t->ealgos >> id) & 1;
2824 }
2825
2826 static int count_ah_combs(const struct xfrm_tmpl *t)
2827 {
2828 int i, sz = 0;
2829
2830 for (i = 0; ; i++) {
2831 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2832 if (!aalg)
2833 break;
2834 if (!aalg->pfkey_supported)
2835 continue;
2836 if (aalg_tmpl_set(t, aalg) && aalg->available)
2837 sz += sizeof(struct sadb_comb);
2838 }
2839 return sz + sizeof(struct sadb_prop);
2840 }
2841
2842 static int count_esp_combs(const struct xfrm_tmpl *t)
2843 {
2844 int i, k, sz = 0;
2845
2846 for (i = 0; ; i++) {
2847 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2848 if (!ealg)
2849 break;
2850
2851 if (!ealg->pfkey_supported)
2852 continue;
2853
2854 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2855 continue;
2856
2857 for (k = 1; ; k++) {
2858 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2859 if (!aalg)
2860 break;
2861
2862 if (!aalg->pfkey_supported)
2863 continue;
2864
2865 if (aalg_tmpl_set(t, aalg) && aalg->available)
2866 sz += sizeof(struct sadb_comb);
2867 }
2868 }
2869 return sz + sizeof(struct sadb_prop);
2870 }
2871
2872 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2873 {
2874 struct sadb_prop *p;
2875 int i;
2876
2877 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2878 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2879 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2880 p->sadb_prop_replay = 32;
2881 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2882
2883 for (i = 0; ; i++) {
2884 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2885 if (!aalg)
2886 break;
2887
2888 if (!aalg->pfkey_supported)
2889 continue;
2890
2891 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2892 struct sadb_comb *c;
2893 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2894 memset(c, 0, sizeof(*c));
2895 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2896 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2897 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2898 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2899 c->sadb_comb_hard_addtime = 24*60*60;
2900 c->sadb_comb_soft_addtime = 20*60*60;
2901 c->sadb_comb_hard_usetime = 8*60*60;
2902 c->sadb_comb_soft_usetime = 7*60*60;
2903 }
2904 }
2905 }
2906
2907 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2908 {
2909 struct sadb_prop *p;
2910 int i, k;
2911
2912 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2913 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2914 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2915 p->sadb_prop_replay = 32;
2916 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2917
2918 for (i=0; ; i++) {
2919 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920 if (!ealg)
2921 break;
2922
2923 if (!ealg->pfkey_supported)
2924 continue;
2925
2926 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927 continue;
2928
2929 for (k = 1; ; k++) {
2930 struct sadb_comb *c;
2931 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2932 if (!aalg)
2933 break;
2934 if (!aalg->pfkey_supported)
2935 continue;
2936 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2937 continue;
2938 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2939 memset(c, 0, sizeof(*c));
2940 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2941 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2942 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2943 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2944 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2945 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2946 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2947 c->sadb_comb_hard_addtime = 24*60*60;
2948 c->sadb_comb_soft_addtime = 20*60*60;
2949 c->sadb_comb_hard_usetime = 8*60*60;
2950 c->sadb_comb_soft_usetime = 7*60*60;
2951 }
2952 }
2953 }
2954
2955 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2956 {
2957 return 0;
2958 }
2959
2960 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2961 {
2962 struct sk_buff *out_skb;
2963 struct sadb_msg *out_hdr;
2964 int hard;
2965 int hsc;
2966
2967 hard = c->data.hard;
2968 if (hard)
2969 hsc = 2;
2970 else
2971 hsc = 1;
2972
2973 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2974 if (IS_ERR(out_skb))
2975 return PTR_ERR(out_skb);
2976
2977 out_hdr = (struct sadb_msg *) out_skb->data;
2978 out_hdr->sadb_msg_version = PF_KEY_V2;
2979 out_hdr->sadb_msg_type = SADB_EXPIRE;
2980 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2981 out_hdr->sadb_msg_errno = 0;
2982 out_hdr->sadb_msg_reserved = 0;
2983 out_hdr->sadb_msg_seq = 0;
2984 out_hdr->sadb_msg_pid = 0;
2985
2986 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2987 return 0;
2988 }
2989
2990 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2991 {
2992 struct net *net = x ? xs_net(x) : c->net;
2993 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2994
2995 if (atomic_read(&net_pfkey->socks_nr) == 0)
2996 return 0;
2997
2998 switch (c->event) {
2999 case XFRM_MSG_EXPIRE:
3000 return key_notify_sa_expire(x, c);
3001 case XFRM_MSG_DELSA:
3002 case XFRM_MSG_NEWSA:
3003 case XFRM_MSG_UPDSA:
3004 return key_notify_sa(x, c);
3005 case XFRM_MSG_FLUSHSA:
3006 return key_notify_sa_flush(c);
3007 case XFRM_MSG_NEWAE: /* not yet supported */
3008 break;
3009 default:
3010 pr_err("pfkey: Unknown SA event %d\n", c->event);
3011 break;
3012 }
3013
3014 return 0;
3015 }
3016
3017 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3018 {
3019 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3020 return 0;
3021
3022 switch (c->event) {
3023 case XFRM_MSG_POLEXPIRE:
3024 return key_notify_policy_expire(xp, c);
3025 case XFRM_MSG_DELPOLICY:
3026 case XFRM_MSG_NEWPOLICY:
3027 case XFRM_MSG_UPDPOLICY:
3028 return key_notify_policy(xp, dir, c);
3029 case XFRM_MSG_FLUSHPOLICY:
3030 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3031 break;
3032 return key_notify_policy_flush(c);
3033 default:
3034 pr_err("pfkey: Unknown policy event %d\n", c->event);
3035 break;
3036 }
3037
3038 return 0;
3039 }
3040
3041 static u32 get_acqseq(void)
3042 {
3043 u32 res;
3044 static atomic_t acqseq;
3045
3046 do {
3047 res = atomic_inc_return(&acqseq);
3048 } while (!res);
3049 return res;
3050 }
3051
3052 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3053 {
3054 struct sk_buff *skb;
3055 struct sadb_msg *hdr;
3056 struct sadb_address *addr;
3057 struct sadb_x_policy *pol;
3058 int sockaddr_size;
3059 int size;
3060 struct sadb_x_sec_ctx *sec_ctx;
3061 struct xfrm_sec_ctx *xfrm_ctx;
3062 int ctx_size = 0;
3063
3064 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3065 if (!sockaddr_size)
3066 return -EINVAL;
3067
3068 size = sizeof(struct sadb_msg) +
3069 (sizeof(struct sadb_address) * 2) +
3070 (sockaddr_size * 2) +
3071 sizeof(struct sadb_x_policy);
3072
3073 if (x->id.proto == IPPROTO_AH)
3074 size += count_ah_combs(t);
3075 else if (x->id.proto == IPPROTO_ESP)
3076 size += count_esp_combs(t);
3077
3078 if ((xfrm_ctx = x->security)) {
3079 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3080 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3081 }
3082
3083 skb = alloc_skb(size + 16, GFP_ATOMIC);
3084 if (skb == NULL)
3085 return -ENOMEM;
3086
3087 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3088 hdr->sadb_msg_version = PF_KEY_V2;
3089 hdr->sadb_msg_type = SADB_ACQUIRE;
3090 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3091 hdr->sadb_msg_len = size / sizeof(uint64_t);
3092 hdr->sadb_msg_errno = 0;
3093 hdr->sadb_msg_reserved = 0;
3094 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3095 hdr->sadb_msg_pid = 0;
3096
3097 /* src address */
3098 addr = (struct sadb_address*) skb_put(skb,
3099 sizeof(struct sadb_address)+sockaddr_size);
3100 addr->sadb_address_len =
3101 (sizeof(struct sadb_address)+sockaddr_size)/
3102 sizeof(uint64_t);
3103 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3104 addr->sadb_address_proto = 0;
3105 addr->sadb_address_reserved = 0;
3106 addr->sadb_address_prefixlen =
3107 pfkey_sockaddr_fill(&x->props.saddr, 0,
3108 (struct sockaddr *) (addr + 1),
3109 x->props.family);
3110 if (!addr->sadb_address_prefixlen)
3111 BUG();
3112
3113 /* dst address */
3114 addr = (struct sadb_address*) skb_put(skb,
3115 sizeof(struct sadb_address)+sockaddr_size);
3116 addr->sadb_address_len =
3117 (sizeof(struct sadb_address)+sockaddr_size)/
3118 sizeof(uint64_t);
3119 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3120 addr->sadb_address_proto = 0;
3121 addr->sadb_address_reserved = 0;
3122 addr->sadb_address_prefixlen =
3123 pfkey_sockaddr_fill(&x->id.daddr, 0,
3124 (struct sockaddr *) (addr + 1),
3125 x->props.family);
3126 if (!addr->sadb_address_prefixlen)
3127 BUG();
3128
3129 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3130 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3131 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3132 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3133 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3134 pol->sadb_x_policy_id = xp->index;
3135
3136 /* Set sadb_comb's. */
3137 if (x->id.proto == IPPROTO_AH)
3138 dump_ah_combs(skb, t);
3139 else if (x->id.proto == IPPROTO_ESP)
3140 dump_esp_combs(skb, t);
3141
3142 /* security context */
3143 if (xfrm_ctx) {
3144 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3145 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3146 sec_ctx->sadb_x_sec_len =
3147 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3148 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3149 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3150 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3151 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3152 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3153 xfrm_ctx->ctx_len);
3154 }
3155
3156 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3157 }
3158
3159 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3160 u8 *data, int len, int *dir)
3161 {
3162 struct net *net = sock_net(sk);
3163 struct xfrm_policy *xp;
3164 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3165 struct sadb_x_sec_ctx *sec_ctx;
3166
3167 switch (sk->sk_family) {
3168 case AF_INET:
3169 if (opt != IP_IPSEC_POLICY) {
3170 *dir = -EOPNOTSUPP;
3171 return NULL;
3172 }
3173 break;
3174 #if IS_ENABLED(CONFIG_IPV6)
3175 case AF_INET6:
3176 if (opt != IPV6_IPSEC_POLICY) {
3177 *dir = -EOPNOTSUPP;
3178 return NULL;
3179 }
3180 break;
3181 #endif
3182 default:
3183 *dir = -EINVAL;
3184 return NULL;
3185 }
3186
3187 *dir = -EINVAL;
3188
3189 if (len < sizeof(struct sadb_x_policy) ||
3190 pol->sadb_x_policy_len*8 > len ||
3191 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3192 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3193 return NULL;
3194
3195 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3196 if (xp == NULL) {
3197 *dir = -ENOBUFS;
3198 return NULL;
3199 }
3200
3201 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3202 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3203
3204 xp->lft.soft_byte_limit = XFRM_INF;
3205 xp->lft.hard_byte_limit = XFRM_INF;
3206 xp->lft.soft_packet_limit = XFRM_INF;
3207 xp->lft.hard_packet_limit = XFRM_INF;
3208 xp->family = sk->sk_family;
3209
3210 xp->xfrm_nr = 0;
3211 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3212 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3213 goto out;
3214
3215 /* security context too */
3216 if (len >= (pol->sadb_x_policy_len*8 +
3217 sizeof(struct sadb_x_sec_ctx))) {
3218 char *p = (char *)pol;
3219 struct xfrm_user_sec_ctx *uctx;
3220
3221 p += pol->sadb_x_policy_len*8;
3222 sec_ctx = (struct sadb_x_sec_ctx *)p;
3223 if (len < pol->sadb_x_policy_len*8 +
3224 sec_ctx->sadb_x_sec_len) {
3225 *dir = -EINVAL;
3226 goto out;
3227 }
3228 if ((*dir = verify_sec_ctx_len(p)))
3229 goto out;
3230 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3231 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3232 kfree(uctx);
3233
3234 if (*dir)
3235 goto out;
3236 }
3237
3238 *dir = pol->sadb_x_policy_dir-1;
3239 return xp;
3240
3241 out:
3242 xp->walk.dead = 1;
3243 xfrm_policy_destroy(xp);
3244 return NULL;
3245 }
3246
3247 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3248 {
3249 struct sk_buff *skb;
3250 struct sadb_msg *hdr;
3251 struct sadb_sa *sa;
3252 struct sadb_address *addr;
3253 struct sadb_x_nat_t_port *n_port;
3254 int sockaddr_size;
3255 int size;
3256 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3257 struct xfrm_encap_tmpl *natt = NULL;
3258
3259 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3260 if (!sockaddr_size)
3261 return -EINVAL;
3262
3263 if (!satype)
3264 return -EINVAL;
3265
3266 if (!x->encap)
3267 return -EINVAL;
3268
3269 natt = x->encap;
3270
3271 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3272 *
3273 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3274 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3275 */
3276
3277 size = sizeof(struct sadb_msg) +
3278 sizeof(struct sadb_sa) +
3279 (sizeof(struct sadb_address) * 2) +
3280 (sockaddr_size * 2) +
3281 (sizeof(struct sadb_x_nat_t_port) * 2);
3282
3283 skb = alloc_skb(size + 16, GFP_ATOMIC);
3284 if (skb == NULL)
3285 return -ENOMEM;
3286
3287 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3288 hdr->sadb_msg_version = PF_KEY_V2;
3289 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3290 hdr->sadb_msg_satype = satype;
3291 hdr->sadb_msg_len = size / sizeof(uint64_t);
3292 hdr->sadb_msg_errno = 0;
3293 hdr->sadb_msg_reserved = 0;
3294 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3295 hdr->sadb_msg_pid = 0;
3296
3297 /* SA */
3298 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3299 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3300 sa->sadb_sa_exttype = SADB_EXT_SA;
3301 sa->sadb_sa_spi = x->id.spi;
3302 sa->sadb_sa_replay = 0;
3303 sa->sadb_sa_state = 0;
3304 sa->sadb_sa_auth = 0;
3305 sa->sadb_sa_encrypt = 0;
3306 sa->sadb_sa_flags = 0;
3307
3308 /* ADDRESS_SRC (old addr) */
3309 addr = (struct sadb_address*)
3310 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3311 addr->sadb_address_len =
3312 (sizeof(struct sadb_address)+sockaddr_size)/
3313 sizeof(uint64_t);
3314 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3315 addr->sadb_address_proto = 0;
3316 addr->sadb_address_reserved = 0;
3317 addr->sadb_address_prefixlen =
3318 pfkey_sockaddr_fill(&x->props.saddr, 0,
3319 (struct sockaddr *) (addr + 1),
3320 x->props.family);
3321 if (!addr->sadb_address_prefixlen)
3322 BUG();
3323
3324 /* NAT_T_SPORT (old port) */
3325 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3326 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3327 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3328 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3329 n_port->sadb_x_nat_t_port_reserved = 0;
3330
3331 /* ADDRESS_DST (new addr) */
3332 addr = (struct sadb_address*)
3333 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3334 addr->sadb_address_len =
3335 (sizeof(struct sadb_address)+sockaddr_size)/
3336 sizeof(uint64_t);
3337 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3338 addr->sadb_address_proto = 0;
3339 addr->sadb_address_reserved = 0;
3340 addr->sadb_address_prefixlen =
3341 pfkey_sockaddr_fill(ipaddr, 0,
3342 (struct sockaddr *) (addr + 1),
3343 x->props.family);
3344 if (!addr->sadb_address_prefixlen)
3345 BUG();
3346
3347 /* NAT_T_DPORT (new port) */
3348 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3349 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3350 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3351 n_port->sadb_x_nat_t_port_port = sport;
3352 n_port->sadb_x_nat_t_port_reserved = 0;
3353
3354 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3355 }
3356
3357 #ifdef CONFIG_NET_KEY_MIGRATE
3358 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3359 const struct xfrm_selector *sel)
3360 {
3361 struct sadb_address *addr;
3362 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3363 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3364 addr->sadb_address_exttype = type;
3365 addr->sadb_address_proto = sel->proto;
3366 addr->sadb_address_reserved = 0;
3367
3368 switch (type) {
3369 case SADB_EXT_ADDRESS_SRC:
3370 addr->sadb_address_prefixlen = sel->prefixlen_s;
3371 pfkey_sockaddr_fill(&sel->saddr, 0,
3372 (struct sockaddr *)(addr + 1),
3373 sel->family);
3374 break;
3375 case SADB_EXT_ADDRESS_DST:
3376 addr->sadb_address_prefixlen = sel->prefixlen_d;
3377 pfkey_sockaddr_fill(&sel->daddr, 0,
3378 (struct sockaddr *)(addr + 1),
3379 sel->family);
3380 break;
3381 default:
3382 return -EINVAL;
3383 }
3384
3385 return 0;
3386 }
3387
3388
3389 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3390 {
3391 struct sadb_x_kmaddress *kma;
3392 u8 *sa;
3393 int family = k->family;
3394 int socklen = pfkey_sockaddr_len(family);
3395 int size_req;
3396
3397 size_req = (sizeof(struct sadb_x_kmaddress) +
3398 pfkey_sockaddr_pair_size(family));
3399
3400 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3401 memset(kma, 0, size_req);
3402 kma->sadb_x_kmaddress_len = size_req / 8;
3403 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3404 kma->sadb_x_kmaddress_reserved = k->reserved;
3405
3406 sa = (u8 *)(kma + 1);
3407 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3408 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3409 return -EINVAL;
3410
3411 return 0;
3412 }
3413
3414 static int set_ipsecrequest(struct sk_buff *skb,
3415 uint8_t proto, uint8_t mode, int level,
3416 uint32_t reqid, uint8_t family,
3417 const xfrm_address_t *src, const xfrm_address_t *dst)
3418 {
3419 struct sadb_x_ipsecrequest *rq;
3420 u8 *sa;
3421 int socklen = pfkey_sockaddr_len(family);
3422 int size_req;
3423
3424 size_req = sizeof(struct sadb_x_ipsecrequest) +
3425 pfkey_sockaddr_pair_size(family);
3426
3427 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3428 memset(rq, 0, size_req);
3429 rq->sadb_x_ipsecrequest_len = size_req;
3430 rq->sadb_x_ipsecrequest_proto = proto;
3431 rq->sadb_x_ipsecrequest_mode = mode;
3432 rq->sadb_x_ipsecrequest_level = level;
3433 rq->sadb_x_ipsecrequest_reqid = reqid;
3434
3435 sa = (u8 *) (rq + 1);
3436 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3437 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3438 return -EINVAL;
3439
3440 return 0;
3441 }
3442 #endif
3443
3444 #ifdef CONFIG_NET_KEY_MIGRATE
3445 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3446 const struct xfrm_migrate *m, int num_bundles,
3447 const struct xfrm_kmaddress *k)
3448 {
3449 int i;
3450 int sasize_sel;
3451 int size = 0;
3452 int size_pol = 0;
3453 struct sk_buff *skb;
3454 struct sadb_msg *hdr;
3455 struct sadb_x_policy *pol;
3456 const struct xfrm_migrate *mp;
3457
3458 if (type != XFRM_POLICY_TYPE_MAIN)
3459 return 0;
3460
3461 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3462 return -EINVAL;
3463
3464 if (k != NULL) {
3465 /* addresses for KM */
3466 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3467 pfkey_sockaddr_pair_size(k->family));
3468 }
3469
3470 /* selector */
3471 sasize_sel = pfkey_sockaddr_size(sel->family);
3472 if (!sasize_sel)
3473 return -EINVAL;
3474 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3475
3476 /* policy info */
3477 size_pol += sizeof(struct sadb_x_policy);
3478
3479 /* ipsecrequests */
3480 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3481 /* old locator pair */
3482 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3483 pfkey_sockaddr_pair_size(mp->old_family);
3484 /* new locator pair */
3485 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3486 pfkey_sockaddr_pair_size(mp->new_family);
3487 }
3488
3489 size += sizeof(struct sadb_msg) + size_pol;
3490
3491 /* alloc buffer */
3492 skb = alloc_skb(size, GFP_ATOMIC);
3493 if (skb == NULL)
3494 return -ENOMEM;
3495
3496 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3497 hdr->sadb_msg_version = PF_KEY_V2;
3498 hdr->sadb_msg_type = SADB_X_MIGRATE;
3499 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3500 hdr->sadb_msg_len = size / 8;
3501 hdr->sadb_msg_errno = 0;
3502 hdr->sadb_msg_reserved = 0;
3503 hdr->sadb_msg_seq = 0;
3504 hdr->sadb_msg_pid = 0;
3505
3506 /* Addresses to be used by KM for negotiation, if ext is available */
3507 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3508 goto err;
3509
3510 /* selector src */
3511 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3512
3513 /* selector dst */
3514 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3515
3516 /* policy information */
3517 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3518 pol->sadb_x_policy_len = size_pol / 8;
3519 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3520 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3521 pol->sadb_x_policy_dir = dir + 1;
3522 pol->sadb_x_policy_id = 0;
3523 pol->sadb_x_policy_priority = 0;
3524
3525 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3526 /* old ipsecrequest */
3527 int mode = pfkey_mode_from_xfrm(mp->mode);
3528 if (mode < 0)
3529 goto err;
3530 if (set_ipsecrequest(skb, mp->proto, mode,
3531 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3532 mp->reqid, mp->old_family,
3533 &mp->old_saddr, &mp->old_daddr) < 0)
3534 goto err;
3535
3536 /* new ipsecrequest */
3537 if (set_ipsecrequest(skb, mp->proto, mode,
3538 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3539 mp->reqid, mp->new_family,
3540 &mp->new_saddr, &mp->new_daddr) < 0)
3541 goto err;
3542 }
3543
3544 /* broadcast migrate message to sockets */
3545 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3546
3547 return 0;
3548
3549 err:
3550 kfree_skb(skb);
3551 return -EINVAL;
3552 }
3553 #else
3554 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3555 const struct xfrm_migrate *m, int num_bundles,
3556 const struct xfrm_kmaddress *k)
3557 {
3558 return -ENOPROTOOPT;
3559 }
3560 #endif
3561
3562 static int pfkey_sendmsg(struct kiocb *kiocb,
3563 struct socket *sock, struct msghdr *msg, size_t len)
3564 {
3565 struct sock *sk = sock->sk;
3566 struct sk_buff *skb = NULL;
3567 struct sadb_msg *hdr = NULL;
3568 int err;
3569
3570 err = -EOPNOTSUPP;
3571 if (msg->msg_flags & MSG_OOB)
3572 goto out;
3573
3574 err = -EMSGSIZE;
3575 if ((unsigned int)len > sk->sk_sndbuf - 32)
3576 goto out;
3577
3578 err = -ENOBUFS;
3579 skb = alloc_skb(len, GFP_KERNEL);
3580 if (skb == NULL)
3581 goto out;
3582
3583 err = -EFAULT;
3584 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3585 goto out;
3586
3587 hdr = pfkey_get_base_msg(skb, &err);
3588 if (!hdr)
3589 goto out;
3590
3591 mutex_lock(&xfrm_cfg_mutex);
3592 err = pfkey_process(sk, skb, hdr);
3593 mutex_unlock(&xfrm_cfg_mutex);
3594
3595 out:
3596 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3597 err = 0;
3598 kfree_skb(skb);
3599
3600 return err ? : len;
3601 }
3602
3603 static int pfkey_recvmsg(struct kiocb *kiocb,
3604 struct socket *sock, struct msghdr *msg, size_t len,
3605 int flags)
3606 {
3607 struct sock *sk = sock->sk;
3608 struct pfkey_sock *pfk = pfkey_sk(sk);
3609 struct sk_buff *skb;
3610 int copied, err;
3611
3612 err = -EINVAL;
3613 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3614 goto out;
3615
3616 msg->msg_namelen = 0;
3617 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3618 if (skb == NULL)
3619 goto out;
3620
3621 copied = skb->len;
3622 if (copied > len) {
3623 msg->msg_flags |= MSG_TRUNC;
3624 copied = len;
3625 }
3626
3627 skb_reset_transport_header(skb);
3628 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3629 if (err)
3630 goto out_free;
3631
3632 sock_recv_ts_and_drops(msg, sk, skb);
3633
3634 err = (flags & MSG_TRUNC) ? skb->len : copied;
3635
3636 if (pfk->dump.dump != NULL &&
3637 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3638 pfkey_do_dump(pfk);
3639
3640 out_free:
3641 skb_free_datagram(sk, skb);
3642 out:
3643 return err;
3644 }
3645
3646 static const struct proto_ops pfkey_ops = {
3647 .family = PF_KEY,
3648 .owner = THIS_MODULE,
3649 /* Operations that make no sense on pfkey sockets. */
3650 .bind = sock_no_bind,
3651 .connect = sock_no_connect,
3652 .socketpair = sock_no_socketpair,
3653 .accept = sock_no_accept,
3654 .getname = sock_no_getname,
3655 .ioctl = sock_no_ioctl,
3656 .listen = sock_no_listen,
3657 .shutdown = sock_no_shutdown,
3658 .setsockopt = sock_no_setsockopt,
3659 .getsockopt = sock_no_getsockopt,
3660 .mmap = sock_no_mmap,
3661 .sendpage = sock_no_sendpage,
3662
3663 /* Now the operations that really occur. */
3664 .release = pfkey_release,
3665 .poll = datagram_poll,
3666 .sendmsg = pfkey_sendmsg,
3667 .recvmsg = pfkey_recvmsg,
3668 };
3669
3670 static const struct net_proto_family pfkey_family_ops = {
3671 .family = PF_KEY,
3672 .create = pfkey_create,
3673 .owner = THIS_MODULE,
3674 };
3675
3676 #ifdef CONFIG_PROC_FS
3677 static int pfkey_seq_show(struct seq_file *f, void *v)
3678 {
3679 struct sock *s = sk_entry(v);
3680
3681 if (v == SEQ_START_TOKEN)
3682 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3683 else
3684 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3685 s,
3686 atomic_read(&s->sk_refcnt),
3687 sk_rmem_alloc_get(s),
3688 sk_wmem_alloc_get(s),
3689 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3690 sock_i_ino(s)
3691 );
3692 return 0;
3693 }
3694
3695 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3696 __acquires(rcu)
3697 {
3698 struct net *net = seq_file_net(f);
3699 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3700
3701 rcu_read_lock();
3702 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3703 }
3704
3705 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3706 {
3707 struct net *net = seq_file_net(f);
3708 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3709
3710 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3711 }
3712
3713 static void pfkey_seq_stop(struct seq_file *f, void *v)
3714 __releases(rcu)
3715 {
3716 rcu_read_unlock();
3717 }
3718
3719 static const struct seq_operations pfkey_seq_ops = {
3720 .start = pfkey_seq_start,
3721 .next = pfkey_seq_next,
3722 .stop = pfkey_seq_stop,
3723 .show = pfkey_seq_show,
3724 };
3725
3726 static int pfkey_seq_open(struct inode *inode, struct file *file)
3727 {
3728 return seq_open_net(inode, file, &pfkey_seq_ops,
3729 sizeof(struct seq_net_private));
3730 }
3731
3732 static const struct file_operations pfkey_proc_ops = {
3733 .open = pfkey_seq_open,
3734 .read = seq_read,
3735 .llseek = seq_lseek,
3736 .release = seq_release_net,
3737 };
3738
3739 static int __net_init pfkey_init_proc(struct net *net)
3740 {
3741 struct proc_dir_entry *e;
3742
3743 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3744 if (e == NULL)
3745 return -ENOMEM;
3746
3747 return 0;
3748 }
3749
3750 static void __net_exit pfkey_exit_proc(struct net *net)
3751 {
3752 remove_proc_entry("pfkey", net->proc_net);
3753 }
3754 #else
3755 static inline int pfkey_init_proc(struct net *net)
3756 {
3757 return 0;
3758 }
3759
3760 static inline void pfkey_exit_proc(struct net *net)
3761 {
3762 }
3763 #endif
3764
3765 static struct xfrm_mgr pfkeyv2_mgr =
3766 {
3767 .id = "pfkeyv2",
3768 .notify = pfkey_send_notify,
3769 .acquire = pfkey_send_acquire,
3770 .compile_policy = pfkey_compile_policy,
3771 .new_mapping = pfkey_send_new_mapping,
3772 .notify_policy = pfkey_send_policy_notify,
3773 .migrate = pfkey_send_migrate,
3774 };
3775
3776 static int __net_init pfkey_net_init(struct net *net)
3777 {
3778 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3779 int rv;
3780
3781 INIT_HLIST_HEAD(&net_pfkey->table);
3782 atomic_set(&net_pfkey->socks_nr, 0);
3783
3784 rv = pfkey_init_proc(net);
3785
3786 return rv;
3787 }
3788
3789 static void __net_exit pfkey_net_exit(struct net *net)
3790 {
3791 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3792
3793 pfkey_exit_proc(net);
3794 BUG_ON(!hlist_empty(&net_pfkey->table));
3795 }
3796
3797 static struct pernet_operations pfkey_net_ops = {
3798 .init = pfkey_net_init,
3799 .exit = pfkey_net_exit,
3800 .id = &pfkey_net_id,
3801 .size = sizeof(struct netns_pfkey),
3802 };
3803
3804 static void __exit ipsec_pfkey_exit(void)
3805 {
3806 xfrm_unregister_km(&pfkeyv2_mgr);
3807 sock_unregister(PF_KEY);
3808 unregister_pernet_subsys(&pfkey_net_ops);
3809 proto_unregister(&key_proto);
3810 }
3811
3812 static int __init ipsec_pfkey_init(void)
3813 {
3814 int err = proto_register(&key_proto, 0);
3815
3816 if (err != 0)
3817 goto out;
3818
3819 err = register_pernet_subsys(&pfkey_net_ops);
3820 if (err != 0)
3821 goto out_unregister_key_proto;
3822 err = sock_register(&pfkey_family_ops);
3823 if (err != 0)
3824 goto out_unregister_pernet;
3825 err = xfrm_register_km(&pfkeyv2_mgr);
3826 if (err != 0)
3827 goto out_sock_unregister;
3828 out:
3829 return err;
3830
3831 out_sock_unregister:
3832 sock_unregister(PF_KEY);
3833 out_unregister_pernet:
3834 unregister_pernet_subsys(&pfkey_net_ops);
3835 out_unregister_key_proto:
3836 proto_unregister(&key_proto);
3837 goto out;
3838 }
3839
3840 module_init(ipsec_pfkey_init);
3841 module_exit(ipsec_pfkey_exit);
3842 MODULE_LICENSE("GPL");
3843 MODULE_ALIAS_NETPROTO(PF_KEY);
kernel source for telekom puls (alcatel/mediatek)