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Merge tag 'gpio-v3.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / net / key / af_key.c
blob9d585370c5b4d6a1e60728df4dad6c79ca196ee3
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*skb2)->len);
209 *skb2 = NULL;
210 err = 0;
211 }
212 }
213 sock_put(sk);
214 return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria. */
218 #define BROADCAST_ALL 0
219 #define BROADCAST_ONE 1
220 #define BROADCAST_REGISTERED 2
221 #define BROADCAST_PROMISC_ONLY 4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 int broadcast_flags, struct sock *one_sk,
224 struct net *net)
225 {
226 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 struct sock *sk;
228 struct sk_buff *skb2 = NULL;
229 int err = -ESRCH;
230
231 /* XXX Do we need something like netlink_overrun? I think
232 * XXX PF_KEY socket apps will not mind current behavior.
233 */
234 if (!skb)
235 return -ENOMEM;
236
237 rcu_read_lock();
238 sk_for_each_rcu(sk, &net_pfkey->table) {
239 struct pfkey_sock *pfk = pfkey_sk(sk);
240 int err2;
241
242 /* Yes, it means that if you are meant to receive this
243 * pfkey message you receive it twice as promiscuous
244 * socket.
245 */
246 if (pfk->promisc)
247 pfkey_broadcast_one(skb, &skb2, allocation, sk);
248
249 /* the exact target will be processed later */
250 if (sk == one_sk)
251 continue;
252 if (broadcast_flags != BROADCAST_ALL) {
253 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 continue;
255 if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 !pfk->registered)
257 continue;
258 if (broadcast_flags & BROADCAST_ONE)
259 continue;
260 }
261
262 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263
264 /* Error is cleare after succecful sending to at least one
265 * registered KM */
266 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 err = err2;
268 }
269 rcu_read_unlock();
270
271 if (one_sk != NULL)
272 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273
274 kfree_skb(skb2);
275 kfree_skb(skb);
276 return err;
277 }
278
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281 struct sadb_msg *hdr;
282 int rc;
283
284 rc = pfk->dump.dump(pfk);
285 if (rc == -ENOBUFS)
286 return 0;
287
288 if (pfk->dump.skb) {
289 if (!pfkey_can_dump(&pfk->sk))
290 return 0;
291
292 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293 hdr->sadb_msg_seq = 0;
294 hdr->sadb_msg_errno = rc;
295 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296 &pfk->sk, sock_net(&pfk->sk));
297 pfk->dump.skb = NULL;
298 }
299
300 pfkey_terminate_dump(pfk);
301 return rc;
302 }
303
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305 const struct sadb_msg *orig)
306 {
307 *new = *orig;
308 }
309
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313 struct sadb_msg *hdr;
314
315 if (!skb)
316 return -ENOBUFS;
317
318 /* Woe be to the platform trying to support PFKEY yet
319 * having normal errnos outside the 1-255 range, inclusive.
320 */
321 err = -err;
322 if (err == ERESTARTSYS ||
323 err == ERESTARTNOHAND ||
324 err == ERESTARTNOINTR)
325 err = EINTR;
326 if (err >= 512)
327 err = EINVAL;
328 BUG_ON(err <= 0 || err >= 256);
329
330 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331 pfkey_hdr_dup(hdr, orig);
332 hdr->sadb_msg_errno = (uint8_t) err;
333 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334 sizeof(uint64_t));
335
336 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338 return 0;
339 }
340
341 static const u8 sadb_ext_min_len[] = {
342 [SADB_EXT_RESERVED] = (u8) 0,
343 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
344 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
345 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
348 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
351 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
353 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
355 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
356 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
357 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
359 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
360 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
361 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
362 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
363 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
364 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
366 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
367 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family. */
371 static int verify_address_len(const void *p)
372 {
373 const struct sadb_address *sp = p;
374 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
375 const struct sockaddr_in *sin;
376 #if IS_ENABLED(CONFIG_IPV6)
377 const struct sockaddr_in6 *sin6;
378 #endif
379 int len;
380
381 switch (addr->sa_family) {
382 case AF_INET:
383 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384 if (sp->sadb_address_len != len ||
385 sp->sadb_address_prefixlen > 32)
386 return -EINVAL;
387 break;
388 #if IS_ENABLED(CONFIG_IPV6)
389 case AF_INET6:
390 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391 if (sp->sadb_address_len != len ||
392 sp->sadb_address_prefixlen > 128)
393 return -EINVAL;
394 break;
395 #endif
396 default:
397 /* It is user using kernel to keep track of security
398 * associations for another protocol, such as
399 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
400 * lengths.
401 *
402 * XXX Actually, association/policy database is not yet
403 * XXX able to cope with arbitrary sockaddr families.
404 * XXX When it can, remove this -EINVAL. -DaveM
405 */
406 return -EINVAL;
407 break;
408 }
409
410 return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
414 {
415 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416 sec_ctx->sadb_x_ctx_len,
417 sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(const void *p)
421 {
422 const struct sadb_x_sec_ctx *sec_ctx = p;
423 int len = sec_ctx->sadb_x_ctx_len;
424
425 if (len > PAGE_SIZE)
426 return -EINVAL;
427
428 len = pfkey_sec_ctx_len(sec_ctx);
429
430 if (sec_ctx->sadb_x_sec_len != len)
431 return -EINVAL;
432
433 return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
437 {
438 struct xfrm_user_sec_ctx *uctx = NULL;
439 int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443 if (!uctx)
444 return NULL;
445
446 uctx->len = pfkey_sec_ctx_len(sec_ctx);
447 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451 memcpy(uctx + 1, sec_ctx + 1,
452 uctx->ctx_len);
453
454 return uctx;
455 }
456
457 static int present_and_same_family(const struct sadb_address *src,
458 const struct sadb_address *dst)
459 {
460 const struct sockaddr *s_addr, *d_addr;
461
462 if (!src || !dst)
463 return 0;
464
465 s_addr = (const struct sockaddr *)(src + 1);
466 d_addr = (const struct sockaddr *)(dst + 1);
467 if (s_addr->sa_family != d_addr->sa_family)
468 return 0;
469 if (s_addr->sa_family != AF_INET
470 #if IS_ENABLED(CONFIG_IPV6)
471 && s_addr->sa_family != AF_INET6
472 #endif
473 )
474 return 0;
475
476 return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
480 {
481 const char *p = (char *) hdr;
482 int len = skb->len;
483
484 len -= sizeof(*hdr);
485 p += sizeof(*hdr);
486 while (len > 0) {
487 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
488 uint16_t ext_type;
489 int ext_len;
490
491 ext_len = ehdr->sadb_ext_len;
492 ext_len *= sizeof(uint64_t);
493 ext_type = ehdr->sadb_ext_type;
494 if (ext_len < sizeof(uint64_t) ||
495 ext_len > len ||
496 ext_type == SADB_EXT_RESERVED)
497 return -EINVAL;
498
499 if (ext_type <= SADB_EXT_MAX) {
500 int min = (int) sadb_ext_min_len[ext_type];
501 if (ext_len < min)
502 return -EINVAL;
503 if (ext_hdrs[ext_type-1] != NULL)
504 return -EINVAL;
505 if (ext_type == SADB_EXT_ADDRESS_SRC ||
506 ext_type == SADB_EXT_ADDRESS_DST ||
507 ext_type == SADB_EXT_ADDRESS_PROXY ||
508 ext_type == SADB_X_EXT_NAT_T_OA) {
509 if (verify_address_len(p))
510 return -EINVAL;
511 }
512 if (ext_type == SADB_X_EXT_SEC_CTX) {
513 if (verify_sec_ctx_len(p))
514 return -EINVAL;
515 }
516 ext_hdrs[ext_type-1] = (void *) p;
517 }
518 p += ext_len;
519 len -= ext_len;
520 }
521
522 return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528 switch (satype) {
529 case SADB_SATYPE_UNSPEC:
530 return IPSEC_PROTO_ANY;
531 case SADB_SATYPE_AH:
532 return IPPROTO_AH;
533 case SADB_SATYPE_ESP:
534 return IPPROTO_ESP;
535 case SADB_X_SATYPE_IPCOMP:
536 return IPPROTO_COMP;
537 break;
538 default:
539 return 0;
540 }
541 /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547 switch (proto) {
548 case IPPROTO_AH:
549 return SADB_SATYPE_AH;
550 case IPPROTO_ESP:
551 return SADB_SATYPE_ESP;
552 case IPPROTO_COMP:
553 return SADB_X_SATYPE_IPCOMP;
554 break;
555 default:
556 return 0;
557 }
558 /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562 * say specifically 'just raw sockets' as we encode them as 255.
563 */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567 return proto == IPSEC_PROTO_ANY ? 0 : proto;
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572 return proto ? proto : IPSEC_PROTO_ANY;
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577 switch (family) {
578 case AF_INET:
579 return sizeof(struct sockaddr_in);
580 #if IS_ENABLED(CONFIG_IPV6)
581 case AF_INET6:
582 return sizeof(struct sockaddr_in6);
583 #endif
584 }
585 return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591 switch (sa->sa_family) {
592 case AF_INET:
593 xaddr->a4 =
594 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595 return AF_INET;
596 #if IS_ENABLED(CONFIG_IPV6)
597 case AF_INET6:
598 memcpy(xaddr->a6,
599 &((struct sockaddr_in6 *)sa)->sin6_addr,
600 sizeof(struct in6_addr));
601 return AF_INET6;
602 #endif
603 }
604 return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611 xaddr);
612 }
613
614 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
615 {
616 const struct sadb_sa *sa;
617 const struct sadb_address *addr;
618 uint16_t proto;
619 unsigned short family;
620 xfrm_address_t *xaddr;
621
622 sa = ext_hdrs[SADB_EXT_SA - 1];
623 if (sa == NULL)
624 return NULL;
625
626 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627 if (proto == 0)
628 return NULL;
629
630 /* sadb_address_len should be checked by caller */
631 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
632 if (addr == NULL)
633 return NULL;
634
635 family = ((const struct sockaddr *)(addr + 1))->sa_family;
636 switch (family) {
637 case AF_INET:
638 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
639 break;
640 #if IS_ENABLED(CONFIG_IPV6)
641 case AF_INET6:
642 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643 break;
644 #endif
645 default:
646 xaddr = NULL;
647 }
648
649 if (!xaddr)
650 return NULL;
651
652 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665 switch(mode) {
666 case XFRM_MODE_TRANSPORT:
667 return IPSEC_MODE_TRANSPORT;
668 case XFRM_MODE_TUNNEL:
669 return IPSEC_MODE_TUNNEL;
670 case XFRM_MODE_BEET:
671 return IPSEC_MODE_BEET;
672 default:
673 return -1;
674 }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679 switch(mode) {
680 case IPSEC_MODE_ANY: /*XXX*/
681 case IPSEC_MODE_TRANSPORT:
682 return XFRM_MODE_TRANSPORT;
683 case IPSEC_MODE_TUNNEL:
684 return XFRM_MODE_TUNNEL;
685 case IPSEC_MODE_BEET:
686 return XFRM_MODE_BEET;
687 default:
688 return -1;
689 }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
693 struct sockaddr *sa,
694 unsigned short family)
695 {
696 switch (family) {
697 case AF_INET:
698 {
699 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700 sin->sin_family = AF_INET;
701 sin->sin_port = port;
702 sin->sin_addr.s_addr = xaddr->a4;
703 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704 return 32;
705 }
706 #if IS_ENABLED(CONFIG_IPV6)
707 case AF_INET6:
708 {
709 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710 sin6->sin6_family = AF_INET6;
711 sin6->sin6_port = port;
712 sin6->sin6_flowinfo = 0;
713 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
714 sin6->sin6_scope_id = 0;
715 return 128;
716 }
717 #endif
718 }
719 return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
723 int add_keys, int hsc)
724 {
725 struct sk_buff *skb;
726 struct sadb_msg *hdr;
727 struct sadb_sa *sa;
728 struct sadb_lifetime *lifetime;
729 struct sadb_address *addr;
730 struct sadb_key *key;
731 struct sadb_x_sa2 *sa2;
732 struct sadb_x_sec_ctx *sec_ctx;
733 struct xfrm_sec_ctx *xfrm_ctx;
734 int ctx_size = 0;
735 int size;
736 int auth_key_size = 0;
737 int encrypt_key_size = 0;
738 int sockaddr_size;
739 struct xfrm_encap_tmpl *natt = NULL;
740 int mode;
741
742 /* address family check */
743 sockaddr_size = pfkey_sockaddr_size(x->props.family);
744 if (!sockaddr_size)
745 return ERR_PTR(-EINVAL);
746
747 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748 key(AE), (identity(SD),) (sensitivity)> */
749 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750 sizeof(struct sadb_lifetime) +
751 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753 sizeof(struct sadb_address)*2 +
754 sockaddr_size*2 +
755 sizeof(struct sadb_x_sa2);
756
757 if ((xfrm_ctx = x->security)) {
758 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760 }
761
762 /* identity & sensitivity */
763 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
764 size += sizeof(struct sadb_address) + sockaddr_size;
765
766 if (add_keys) {
767 if (x->aalg && x->aalg->alg_key_len) {
768 auth_key_size =
769 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770 size += sizeof(struct sadb_key) + auth_key_size;
771 }
772 if (x->ealg && x->ealg->alg_key_len) {
773 encrypt_key_size =
774 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775 size += sizeof(struct sadb_key) + encrypt_key_size;
776 }
777 }
778 if (x->encap)
779 natt = x->encap;
780
781 if (natt && natt->encap_type) {
782 size += sizeof(struct sadb_x_nat_t_type);
783 size += sizeof(struct sadb_x_nat_t_port);
784 size += sizeof(struct sadb_x_nat_t_port);
785 }
786
787 skb = alloc_skb(size + 16, GFP_ATOMIC);
788 if (skb == NULL)
789 return ERR_PTR(-ENOBUFS);
790
791 /* call should fill header later */
792 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793 memset(hdr, 0, size); /* XXX do we need this ? */
794 hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796 /* sa */
797 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
798 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799 sa->sadb_sa_exttype = SADB_EXT_SA;
800 sa->sadb_sa_spi = x->id.spi;
801 sa->sadb_sa_replay = x->props.replay_window;
802 switch (x->km.state) {
803 case XFRM_STATE_VALID:
804 sa->sadb_sa_state = x->km.dying ?
805 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806 break;
807 case XFRM_STATE_ACQ:
808 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809 break;
810 default:
811 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812 break;
813 }
814 sa->sadb_sa_auth = 0;
815 if (x->aalg) {
816 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
818 a->desc.sadb_alg_id : 0;
819 }
820 sa->sadb_sa_encrypt = 0;
821 BUG_ON(x->ealg && x->calg);
822 if (x->ealg) {
823 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
824 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
825 a->desc.sadb_alg_id : 0;
826 }
827 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
828 if (x->calg) {
829 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
830 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
831 a->desc.sadb_alg_id : 0;
832 }
833
834 sa->sadb_sa_flags = 0;
835 if (x->props.flags & XFRM_STATE_NOECN)
836 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
837 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
838 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
839 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
840 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
841
842 /* hard time */
843 if (hsc & 2) {
844 lifetime = (struct sadb_lifetime *) skb_put(skb,
845 sizeof(struct sadb_lifetime));
846 lifetime->sadb_lifetime_len =
847 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
848 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
849 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
850 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
851 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
852 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
853 }
854 /* soft time */
855 if (hsc & 1) {
856 lifetime = (struct sadb_lifetime *) skb_put(skb,
857 sizeof(struct sadb_lifetime));
858 lifetime->sadb_lifetime_len =
859 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
860 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
861 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
862 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
863 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
864 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
865 }
866 /* current time */
867 lifetime = (struct sadb_lifetime *) skb_put(skb,
868 sizeof(struct sadb_lifetime));
869 lifetime->sadb_lifetime_len =
870 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
871 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
872 lifetime->sadb_lifetime_allocations = x->curlft.packets;
873 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
874 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
875 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
876 /* src address */
877 addr = (struct sadb_address*) skb_put(skb,
878 sizeof(struct sadb_address)+sockaddr_size);
879 addr->sadb_address_len =
880 (sizeof(struct sadb_address)+sockaddr_size)/
881 sizeof(uint64_t);
882 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
883 /* "if the ports are non-zero, then the sadb_address_proto field,
884 normally zero, MUST be filled in with the transport
885 protocol's number." - RFC2367 */
886 addr->sadb_address_proto = 0;
887 addr->sadb_address_reserved = 0;
888
889 addr->sadb_address_prefixlen =
890 pfkey_sockaddr_fill(&x->props.saddr, 0,
891 (struct sockaddr *) (addr + 1),
892 x->props.family);
893 if (!addr->sadb_address_prefixlen)
894 BUG();
895
896 /* dst address */
897 addr = (struct sadb_address*) skb_put(skb,
898 sizeof(struct sadb_address)+sockaddr_size);
899 addr->sadb_address_len =
900 (sizeof(struct sadb_address)+sockaddr_size)/
901 sizeof(uint64_t);
902 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
903 addr->sadb_address_proto = 0;
904 addr->sadb_address_reserved = 0;
905
906 addr->sadb_address_prefixlen =
907 pfkey_sockaddr_fill(&x->id.daddr, 0,
908 (struct sockaddr *) (addr + 1),
909 x->props.family);
910 if (!addr->sadb_address_prefixlen)
911 BUG();
912
913 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
914 x->props.family)) {
915 addr = (struct sadb_address*) skb_put(skb,
916 sizeof(struct sadb_address)+sockaddr_size);
917 addr->sadb_address_len =
918 (sizeof(struct sadb_address)+sockaddr_size)/
919 sizeof(uint64_t);
920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
921 addr->sadb_address_proto =
922 pfkey_proto_from_xfrm(x->sel.proto);
923 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
924 addr->sadb_address_reserved = 0;
925
926 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
927 (struct sockaddr *) (addr + 1),
928 x->props.family);
929 }
930
931 /* auth key */
932 if (add_keys && auth_key_size) {
933 key = (struct sadb_key *) skb_put(skb,
934 sizeof(struct sadb_key)+auth_key_size);
935 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
936 sizeof(uint64_t);
937 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
938 key->sadb_key_bits = x->aalg->alg_key_len;
939 key->sadb_key_reserved = 0;
940 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
941 }
942 /* encrypt key */
943 if (add_keys && encrypt_key_size) {
944 key = (struct sadb_key *) skb_put(skb,
945 sizeof(struct sadb_key)+encrypt_key_size);
946 key->sadb_key_len = (sizeof(struct sadb_key) +
947 encrypt_key_size) / sizeof(uint64_t);
948 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
949 key->sadb_key_bits = x->ealg->alg_key_len;
950 key->sadb_key_reserved = 0;
951 memcpy(key + 1, x->ealg->alg_key,
952 (x->ealg->alg_key_len+7)/8);
953 }
954
955 /* sa */
956 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
957 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
958 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
959 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
960 kfree_skb(skb);
961 return ERR_PTR(-EINVAL);
962 }
963 sa2->sadb_x_sa2_mode = mode;
964 sa2->sadb_x_sa2_reserved1 = 0;
965 sa2->sadb_x_sa2_reserved2 = 0;
966 sa2->sadb_x_sa2_sequence = 0;
967 sa2->sadb_x_sa2_reqid = x->props.reqid;
968
969 if (natt && natt->encap_type) {
970 struct sadb_x_nat_t_type *n_type;
971 struct sadb_x_nat_t_port *n_port;
972
973 /* type */
974 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
975 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
976 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
977 n_type->sadb_x_nat_t_type_type = natt->encap_type;
978 n_type->sadb_x_nat_t_type_reserved[0] = 0;
979 n_type->sadb_x_nat_t_type_reserved[1] = 0;
980 n_type->sadb_x_nat_t_type_reserved[2] = 0;
981
982 /* source port */
983 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
984 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
985 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
986 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
987 n_port->sadb_x_nat_t_port_reserved = 0;
988
989 /* dest port */
990 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
991 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
992 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
993 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
994 n_port->sadb_x_nat_t_port_reserved = 0;
995 }
996
997 /* security context */
998 if (xfrm_ctx) {
999 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001 sec_ctx->sadb_x_sec_len =
1002 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008 xfrm_ctx->ctx_len);
1009 }
1010
1011 return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017 struct sk_buff *skb;
1018
1019 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021 return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025 int hsc)
1026 {
1027 return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031 const struct sadb_msg *hdr,
1032 void * const *ext_hdrs)
1033 {
1034 struct xfrm_state *x;
1035 const struct sadb_lifetime *lifetime;
1036 const struct sadb_sa *sa;
1037 const struct sadb_key *key;
1038 const struct sadb_x_sec_ctx *sec_ctx;
1039 uint16_t proto;
1040 int err;
1041
1042
1043 sa = ext_hdrs[SADB_EXT_SA - 1];
1044 if (!sa ||
1045 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047 return ERR_PTR(-EINVAL);
1048 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050 return ERR_PTR(-EINVAL);
1051 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053 return ERR_PTR(-EINVAL);
1054 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056 return ERR_PTR(-EINVAL);
1057
1058 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059 if (proto == 0)
1060 return ERR_PTR(-EINVAL);
1061
1062 /* default error is no buffer space */
1063 err = -ENOBUFS;
1064
1065 /* RFC2367:
1066
1067 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072 not true.
1073
1074 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076 */
1077 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081 return ERR_PTR(-EINVAL);
1082 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083 if (key != NULL &&
1084 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085 ((key->sadb_key_bits+7) / 8 == 0 ||
1086 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087 return ERR_PTR(-EINVAL);
1088 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089 if (key != NULL &&
1090 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091 ((key->sadb_key_bits+7) / 8 == 0 ||
1092 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093 return ERR_PTR(-EINVAL);
1094
1095 x = xfrm_state_alloc(net);
1096 if (x == NULL)
1097 return ERR_PTR(-ENOBUFS);
1098
1099 x->id.proto = proto;
1100 x->id.spi = sa->sadb_sa_spi;
1101 x->props.replay_window = sa->sadb_sa_replay;
1102 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103 x->props.flags |= XFRM_STATE_NOECN;
1104 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110 if (lifetime != NULL) {
1111 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115 }
1116 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117 if (lifetime != NULL) {
1118 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122 }
1123
1124 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125 if (sec_ctx != NULL) {
1126 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1127
1128 if (!uctx)
1129 goto out;
1130
1131 err = security_xfrm_state_alloc(x, uctx);
1132 kfree(uctx);
1133
1134 if (err)
1135 goto out;
1136 }
1137
1138 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139 if (sa->sadb_sa_auth) {
1140 int keysize = 0;
1141 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142 if (!a || !a->pfkey_supported) {
1143 err = -ENOSYS;
1144 goto out;
1145 }
1146 if (key)
1147 keysize = (key->sadb_key_bits + 7) / 8;
1148 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149 if (!x->aalg)
1150 goto out;
1151 strcpy(x->aalg->alg_name, a->name);
1152 x->aalg->alg_key_len = 0;
1153 if (key) {
1154 x->aalg->alg_key_len = key->sadb_key_bits;
1155 memcpy(x->aalg->alg_key, key+1, keysize);
1156 }
1157 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158 x->props.aalgo = sa->sadb_sa_auth;
1159 /* x->algo.flags = sa->sadb_sa_flags; */
1160 }
1161 if (sa->sadb_sa_encrypt) {
1162 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164 if (!a || !a->pfkey_supported) {
1165 err = -ENOSYS;
1166 goto out;
1167 }
1168 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169 if (!x->calg)
1170 goto out;
1171 strcpy(x->calg->alg_name, a->name);
1172 x->props.calgo = sa->sadb_sa_encrypt;
1173 } else {
1174 int keysize = 0;
1175 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176 if (!a || !a->pfkey_supported) {
1177 err = -ENOSYS;
1178 goto out;
1179 }
1180 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181 if (key)
1182 keysize = (key->sadb_key_bits + 7) / 8;
1183 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184 if (!x->ealg)
1185 goto out;
1186 strcpy(x->ealg->alg_name, a->name);
1187 x->ealg->alg_key_len = 0;
1188 if (key) {
1189 x->ealg->alg_key_len = key->sadb_key_bits;
1190 memcpy(x->ealg->alg_key, key+1, keysize);
1191 }
1192 x->props.ealgo = sa->sadb_sa_encrypt;
1193 }
1194 }
1195 /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198 &x->props.saddr);
1199 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1200 &x->id.daddr);
1201
1202 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1203 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1204 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1205 if (mode < 0) {
1206 err = -EINVAL;
1207 goto out;
1208 }
1209 x->props.mode = mode;
1210 x->props.reqid = sa2->sadb_x_sa2_reqid;
1211 }
1212
1213 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1214 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1215
1216 /* Nobody uses this, but we try. */
1217 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1218 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1219 }
1220
1221 if (!x->sel.family)
1222 x->sel.family = x->props.family;
1223
1224 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1225 const struct sadb_x_nat_t_type* n_type;
1226 struct xfrm_encap_tmpl *natt;
1227
1228 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1229 if (!x->encap)
1230 goto out;
1231
1232 natt = x->encap;
1233 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1234 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1235
1236 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1237 const struct sadb_x_nat_t_port *n_port =
1238 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1239 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1240 }
1241 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1242 const struct sadb_x_nat_t_port *n_port =
1243 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1244 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1245 }
1246 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1247 }
1248
1249 err = xfrm_init_state(x);
1250 if (err)
1251 goto out;
1252
1253 x->km.seq = hdr->sadb_msg_seq;
1254 return x;
1255
1256 out:
1257 x->km.state = XFRM_STATE_DEAD;
1258 xfrm_state_put(x);
1259 return ERR_PTR(err);
1260 }
1261
1262 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1263 {
1264 return -EOPNOTSUPP;
1265 }
1266
1267 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1268 {
1269 struct net *net = sock_net(sk);
1270 struct sk_buff *resp_skb;
1271 struct sadb_x_sa2 *sa2;
1272 struct sadb_address *saddr, *daddr;
1273 struct sadb_msg *out_hdr;
1274 struct sadb_spirange *range;
1275 struct xfrm_state *x = NULL;
1276 int mode;
1277 int err;
1278 u32 min_spi, max_spi;
1279 u32 reqid;
1280 u8 proto;
1281 unsigned short family;
1282 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1283
1284 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1285 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1286 return -EINVAL;
1287
1288 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1289 if (proto == 0)
1290 return -EINVAL;
1291
1292 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1293 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1294 if (mode < 0)
1295 return -EINVAL;
1296 reqid = sa2->sadb_x_sa2_reqid;
1297 } else {
1298 mode = 0;
1299 reqid = 0;
1300 }
1301
1302 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1303 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1304
1305 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1306 switch (family) {
1307 case AF_INET:
1308 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1309 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1310 break;
1311 #if IS_ENABLED(CONFIG_IPV6)
1312 case AF_INET6:
1313 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1314 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1315 break;
1316 #endif
1317 }
1318
1319 if (hdr->sadb_msg_seq) {
1320 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1321 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1322 xfrm_state_put(x);
1323 x = NULL;
1324 }
1325 }
1326
1327 if (!x)
1328 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1329
1330 if (x == NULL)
1331 return -ENOENT;
1332
1333 min_spi = 0x100;
1334 max_spi = 0x0fffffff;
1335
1336 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1337 if (range) {
1338 min_spi = range->sadb_spirange_min;
1339 max_spi = range->sadb_spirange_max;
1340 }
1341
1342 err = xfrm_alloc_spi(x, min_spi, max_spi);
1343 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1344
1345 if (IS_ERR(resp_skb)) {
1346 xfrm_state_put(x);
1347 return PTR_ERR(resp_skb);
1348 }
1349
1350 out_hdr = (struct sadb_msg *) resp_skb->data;
1351 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1352 out_hdr->sadb_msg_type = SADB_GETSPI;
1353 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1354 out_hdr->sadb_msg_errno = 0;
1355 out_hdr->sadb_msg_reserved = 0;
1356 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1357 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1358
1359 xfrm_state_put(x);
1360
1361 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1362
1363 return 0;
1364 }
1365
1366 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1367 {
1368 struct net *net = sock_net(sk);
1369 struct xfrm_state *x;
1370
1371 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1372 return -EOPNOTSUPP;
1373
1374 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1375 return 0;
1376
1377 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1378 if (x == NULL)
1379 return 0;
1380
1381 spin_lock_bh(&x->lock);
1382 if (x->km.state == XFRM_STATE_ACQ) {
1383 x->km.state = XFRM_STATE_ERROR;
1384 wake_up(&net->xfrm.km_waitq);
1385 }
1386 spin_unlock_bh(&x->lock);
1387 xfrm_state_put(x);
1388 return 0;
1389 }
1390
1391 static inline int event2poltype(int event)
1392 {
1393 switch (event) {
1394 case XFRM_MSG_DELPOLICY:
1395 return SADB_X_SPDDELETE;
1396 case XFRM_MSG_NEWPOLICY:
1397 return SADB_X_SPDADD;
1398 case XFRM_MSG_UPDPOLICY:
1399 return SADB_X_SPDUPDATE;
1400 case XFRM_MSG_POLEXPIRE:
1401 // return SADB_X_SPDEXPIRE;
1402 default:
1403 pr_err("pfkey: Unknown policy event %d\n", event);
1404 break;
1405 }
1406
1407 return 0;
1408 }
1409
1410 static inline int event2keytype(int event)
1411 {
1412 switch (event) {
1413 case XFRM_MSG_DELSA:
1414 return SADB_DELETE;
1415 case XFRM_MSG_NEWSA:
1416 return SADB_ADD;
1417 case XFRM_MSG_UPDSA:
1418 return SADB_UPDATE;
1419 case XFRM_MSG_EXPIRE:
1420 return SADB_EXPIRE;
1421 default:
1422 pr_err("pfkey: Unknown SA event %d\n", event);
1423 break;
1424 }
1425
1426 return 0;
1427 }
1428
1429 /* ADD/UPD/DEL */
1430 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1431 {
1432 struct sk_buff *skb;
1433 struct sadb_msg *hdr;
1434
1435 skb = pfkey_xfrm_state2msg(x);
1436
1437 if (IS_ERR(skb))
1438 return PTR_ERR(skb);
1439
1440 hdr = (struct sadb_msg *) skb->data;
1441 hdr->sadb_msg_version = PF_KEY_V2;
1442 hdr->sadb_msg_type = event2keytype(c->event);
1443 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1444 hdr->sadb_msg_errno = 0;
1445 hdr->sadb_msg_reserved = 0;
1446 hdr->sadb_msg_seq = c->seq;
1447 hdr->sadb_msg_pid = c->portid;
1448
1449 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1450
1451 return 0;
1452 }
1453
1454 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1455 {
1456 struct net *net = sock_net(sk);
1457 struct xfrm_state *x;
1458 int err;
1459 struct km_event c;
1460
1461 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1462 if (IS_ERR(x))
1463 return PTR_ERR(x);
1464
1465 xfrm_state_hold(x);
1466 if (hdr->sadb_msg_type == SADB_ADD)
1467 err = xfrm_state_add(x);
1468 else
1469 err = xfrm_state_update(x);
1470
1471 xfrm_audit_state_add(x, err ? 0 : 1,
1472 audit_get_loginuid(current),
1473 audit_get_sessionid(current), 0);
1474
1475 if (err < 0) {
1476 x->km.state = XFRM_STATE_DEAD;
1477 __xfrm_state_put(x);
1478 goto out;
1479 }
1480
1481 if (hdr->sadb_msg_type == SADB_ADD)
1482 c.event = XFRM_MSG_NEWSA;
1483 else
1484 c.event = XFRM_MSG_UPDSA;
1485 c.seq = hdr->sadb_msg_seq;
1486 c.portid = hdr->sadb_msg_pid;
1487 km_state_notify(x, &c);
1488 out:
1489 xfrm_state_put(x);
1490 return err;
1491 }
1492
1493 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1494 {
1495 struct net *net = sock_net(sk);
1496 struct xfrm_state *x;
1497 struct km_event c;
1498 int err;
1499
1500 if (!ext_hdrs[SADB_EXT_SA-1] ||
1501 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1502 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1503 return -EINVAL;
1504
1505 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1506 if (x == NULL)
1507 return -ESRCH;
1508
1509 if ((err = security_xfrm_state_delete(x)))
1510 goto out;
1511
1512 if (xfrm_state_kern(x)) {
1513 err = -EPERM;
1514 goto out;
1515 }
1516
1517 err = xfrm_state_delete(x);
1518
1519 if (err < 0)
1520 goto out;
1521
1522 c.seq = hdr->sadb_msg_seq;
1523 c.portid = hdr->sadb_msg_pid;
1524 c.event = XFRM_MSG_DELSA;
1525 km_state_notify(x, &c);
1526 out:
1527 xfrm_audit_state_delete(x, err ? 0 : 1,
1528 audit_get_loginuid(current),
1529 audit_get_sessionid(current), 0);
1530 xfrm_state_put(x);
1531
1532 return err;
1533 }
1534
1535 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1536 {
1537 struct net *net = sock_net(sk);
1538 __u8 proto;
1539 struct sk_buff *out_skb;
1540 struct sadb_msg *out_hdr;
1541 struct xfrm_state *x;
1542
1543 if (!ext_hdrs[SADB_EXT_SA-1] ||
1544 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1545 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1546 return -EINVAL;
1547
1548 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1549 if (x == NULL)
1550 return -ESRCH;
1551
1552 out_skb = pfkey_xfrm_state2msg(x);
1553 proto = x->id.proto;
1554 xfrm_state_put(x);
1555 if (IS_ERR(out_skb))
1556 return PTR_ERR(out_skb);
1557
1558 out_hdr = (struct sadb_msg *) out_skb->data;
1559 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1560 out_hdr->sadb_msg_type = SADB_GET;
1561 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1562 out_hdr->sadb_msg_errno = 0;
1563 out_hdr->sadb_msg_reserved = 0;
1564 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1565 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1566 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1567
1568 return 0;
1569 }
1570
1571 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1572 gfp_t allocation)
1573 {
1574 struct sk_buff *skb;
1575 struct sadb_msg *hdr;
1576 int len, auth_len, enc_len, i;
1577
1578 auth_len = xfrm_count_pfkey_auth_supported();
1579 if (auth_len) {
1580 auth_len *= sizeof(struct sadb_alg);
1581 auth_len += sizeof(struct sadb_supported);
1582 }
1583
1584 enc_len = xfrm_count_pfkey_enc_supported();
1585 if (enc_len) {
1586 enc_len *= sizeof(struct sadb_alg);
1587 enc_len += sizeof(struct sadb_supported);
1588 }
1589
1590 len = enc_len + auth_len + sizeof(struct sadb_msg);
1591
1592 skb = alloc_skb(len + 16, allocation);
1593 if (!skb)
1594 goto out_put_algs;
1595
1596 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1597 pfkey_hdr_dup(hdr, orig);
1598 hdr->sadb_msg_errno = 0;
1599 hdr->sadb_msg_len = len / sizeof(uint64_t);
1600
1601 if (auth_len) {
1602 struct sadb_supported *sp;
1603 struct sadb_alg *ap;
1604
1605 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1606 ap = (struct sadb_alg *) (sp + 1);
1607
1608 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1609 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1610
1611 for (i = 0; ; i++) {
1612 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1613 if (!aalg)
1614 break;
1615 if (!aalg->pfkey_supported)
1616 continue;
1617 if (aalg->available)
1618 *ap++ = aalg->desc;
1619 }
1620 }
1621
1622 if (enc_len) {
1623 struct sadb_supported *sp;
1624 struct sadb_alg *ap;
1625
1626 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1627 ap = (struct sadb_alg *) (sp + 1);
1628
1629 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1630 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1631
1632 for (i = 0; ; i++) {
1633 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1634 if (!ealg)
1635 break;
1636 if (!ealg->pfkey_supported)
1637 continue;
1638 if (ealg->available)
1639 *ap++ = ealg->desc;
1640 }
1641 }
1642
1643 out_put_algs:
1644 return skb;
1645 }
1646
1647 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1648 {
1649 struct pfkey_sock *pfk = pfkey_sk(sk);
1650 struct sk_buff *supp_skb;
1651
1652 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1653 return -EINVAL;
1654
1655 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1656 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1657 return -EEXIST;
1658 pfk->registered |= (1<<hdr->sadb_msg_satype);
1659 }
1660
1661 xfrm_probe_algs();
1662
1663 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1664 if (!supp_skb) {
1665 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1666 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1667
1668 return -ENOBUFS;
1669 }
1670
1671 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1672
1673 return 0;
1674 }
1675
1676 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1677 {
1678 struct sk_buff *skb;
1679 struct sadb_msg *hdr;
1680
1681 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1682 if (!skb)
1683 return -ENOBUFS;
1684
1685 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1686 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1687 hdr->sadb_msg_errno = (uint8_t) 0;
1688 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1689
1690 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1691 }
1692
1693 static int key_notify_sa_flush(const struct km_event *c)
1694 {
1695 struct sk_buff *skb;
1696 struct sadb_msg *hdr;
1697
1698 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1699 if (!skb)
1700 return -ENOBUFS;
1701 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1702 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1703 hdr->sadb_msg_type = SADB_FLUSH;
1704 hdr->sadb_msg_seq = c->seq;
1705 hdr->sadb_msg_pid = c->portid;
1706 hdr->sadb_msg_version = PF_KEY_V2;
1707 hdr->sadb_msg_errno = (uint8_t) 0;
1708 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1709 hdr->sadb_msg_reserved = 0;
1710
1711 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1712
1713 return 0;
1714 }
1715
1716 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1717 {
1718 struct net *net = sock_net(sk);
1719 unsigned int proto;
1720 struct km_event c;
1721 struct xfrm_audit audit_info;
1722 int err, err2;
1723
1724 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1725 if (proto == 0)
1726 return -EINVAL;
1727
1728 audit_info.loginuid = audit_get_loginuid(current);
1729 audit_info.sessionid = audit_get_sessionid(current);
1730 audit_info.secid = 0;
1731 err = xfrm_state_flush(net, proto, &audit_info);
1732 err2 = unicast_flush_resp(sk, hdr);
1733 if (err || err2) {
1734 if (err == -ESRCH) /* empty table - go quietly */
1735 err = 0;
1736 return err ? err : err2;
1737 }
1738
1739 c.data.proto = proto;
1740 c.seq = hdr->sadb_msg_seq;
1741 c.portid = hdr->sadb_msg_pid;
1742 c.event = XFRM_MSG_FLUSHSA;
1743 c.net = net;
1744 km_state_notify(NULL, &c);
1745
1746 return 0;
1747 }
1748
1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1750 {
1751 struct pfkey_sock *pfk = ptr;
1752 struct sk_buff *out_skb;
1753 struct sadb_msg *out_hdr;
1754
1755 if (!pfkey_can_dump(&pfk->sk))
1756 return -ENOBUFS;
1757
1758 out_skb = pfkey_xfrm_state2msg(x);
1759 if (IS_ERR(out_skb))
1760 return PTR_ERR(out_skb);
1761
1762 out_hdr = (struct sadb_msg *) out_skb->data;
1763 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1764 out_hdr->sadb_msg_type = SADB_DUMP;
1765 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1766 out_hdr->sadb_msg_errno = 0;
1767 out_hdr->sadb_msg_reserved = 0;
1768 out_hdr->sadb_msg_seq = count + 1;
1769 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1770
1771 if (pfk->dump.skb)
1772 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1773 &pfk->sk, sock_net(&pfk->sk));
1774 pfk->dump.skb = out_skb;
1775
1776 return 0;
1777 }
1778
1779 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1780 {
1781 struct net *net = sock_net(&pfk->sk);
1782 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 }
1784
1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1786 {
1787 xfrm_state_walk_done(&pfk->dump.u.state);
1788 }
1789
1790 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1791 {
1792 u8 proto;
1793 struct pfkey_sock *pfk = pfkey_sk(sk);
1794
1795 if (pfk->dump.dump != NULL)
1796 return -EBUSY;
1797
1798 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1799 if (proto == 0)
1800 return -EINVAL;
1801
1802 pfk->dump.msg_version = hdr->sadb_msg_version;
1803 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1804 pfk->dump.dump = pfkey_dump_sa;
1805 pfk->dump.done = pfkey_dump_sa_done;
1806 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1807
1808 return pfkey_do_dump(pfk);
1809 }
1810
1811 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1812 {
1813 struct pfkey_sock *pfk = pfkey_sk(sk);
1814 int satype = hdr->sadb_msg_satype;
1815 bool reset_errno = false;
1816
1817 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1818 reset_errno = true;
1819 if (satype != 0 && satype != 1)
1820 return -EINVAL;
1821 pfk->promisc = satype;
1822 }
1823 if (reset_errno && skb_cloned(skb))
1824 skb = skb_copy(skb, GFP_KERNEL);
1825 else
1826 skb = skb_clone(skb, GFP_KERNEL);
1827
1828 if (reset_errno && skb) {
1829 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1830 new_hdr->sadb_msg_errno = 0;
1831 }
1832
1833 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1834 return 0;
1835 }
1836
1837 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1838 {
1839 int i;
1840 u32 reqid = *(u32*)ptr;
1841
1842 for (i=0; i<xp->xfrm_nr; i++) {
1843 if (xp->xfrm_vec[i].reqid == reqid)
1844 return -EEXIST;
1845 }
1846 return 0;
1847 }
1848
1849 static u32 gen_reqid(struct net *net)
1850 {
1851 struct xfrm_policy_walk walk;
1852 u32 start;
1853 int rc;
1854 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1855
1856 start = reqid;
1857 do {
1858 ++reqid;
1859 if (reqid == 0)
1860 reqid = IPSEC_MANUAL_REQID_MAX+1;
1861 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1862 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1863 xfrm_policy_walk_done(&walk);
1864 if (rc != -EEXIST)
1865 return reqid;
1866 } while (reqid != start);
1867 return 0;
1868 }
1869
1870 static int
1871 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1872 {
1873 struct net *net = xp_net(xp);
1874 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1875 int mode;
1876
1877 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1878 return -ELOOP;
1879
1880 if (rq->sadb_x_ipsecrequest_mode == 0)
1881 return -EINVAL;
1882
1883 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1884 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1885 return -EINVAL;
1886 t->mode = mode;
1887 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1888 t->optional = 1;
1889 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1890 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1891 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1892 t->reqid = 0;
1893 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1894 return -ENOBUFS;
1895 }
1896
1897 /* addresses present only in tunnel mode */
1898 if (t->mode == XFRM_MODE_TUNNEL) {
1899 u8 *sa = (u8 *) (rq + 1);
1900 int family, socklen;
1901
1902 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1903 &t->saddr);
1904 if (!family)
1905 return -EINVAL;
1906
1907 socklen = pfkey_sockaddr_len(family);
1908 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1909 &t->id.daddr) != family)
1910 return -EINVAL;
1911 t->encap_family = family;
1912 } else
1913 t->encap_family = xp->family;
1914
1915 /* No way to set this via kame pfkey */
1916 t->allalgs = 1;
1917 xp->xfrm_nr++;
1918 return 0;
1919 }
1920
1921 static int
1922 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1923 {
1924 int err;
1925 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1926 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1927
1928 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1929 return -EINVAL;
1930
1931 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1932 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1933 return err;
1934 len -= rq->sadb_x_ipsecrequest_len;
1935 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1936 }
1937 return 0;
1938 }
1939
1940 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1941 {
1942 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1943
1944 if (xfrm_ctx) {
1945 int len = sizeof(struct sadb_x_sec_ctx);
1946 len += xfrm_ctx->ctx_len;
1947 return PFKEY_ALIGN8(len);
1948 }
1949 return 0;
1950 }
1951
1952 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1953 {
1954 const struct xfrm_tmpl *t;
1955 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1956 int socklen = 0;
1957 int i;
1958
1959 for (i=0; i<xp->xfrm_nr; i++) {
1960 t = xp->xfrm_vec + i;
1961 socklen += pfkey_sockaddr_len(t->encap_family);
1962 }
1963
1964 return sizeof(struct sadb_msg) +
1965 (sizeof(struct sadb_lifetime) * 3) +
1966 (sizeof(struct sadb_address) * 2) +
1967 (sockaddr_size * 2) +
1968 sizeof(struct sadb_x_policy) +
1969 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1970 (socklen * 2) +
1971 pfkey_xfrm_policy2sec_ctx_size(xp);
1972 }
1973
1974 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1975 {
1976 struct sk_buff *skb;
1977 int size;
1978
1979 size = pfkey_xfrm_policy2msg_size(xp);
1980
1981 skb = alloc_skb(size + 16, GFP_ATOMIC);
1982 if (skb == NULL)
1983 return ERR_PTR(-ENOBUFS);
1984
1985 return skb;
1986 }
1987
1988 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1989 {
1990 struct sadb_msg *hdr;
1991 struct sadb_address *addr;
1992 struct sadb_lifetime *lifetime;
1993 struct sadb_x_policy *pol;
1994 struct sadb_x_sec_ctx *sec_ctx;
1995 struct xfrm_sec_ctx *xfrm_ctx;
1996 int i;
1997 int size;
1998 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1999 int socklen = pfkey_sockaddr_len(xp->family);
2000
2001 size = pfkey_xfrm_policy2msg_size(xp);
2002
2003 /* call should fill header later */
2004 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2005 memset(hdr, 0, size); /* XXX do we need this ? */
2006
2007 /* src address */
2008 addr = (struct sadb_address*) skb_put(skb,
2009 sizeof(struct sadb_address)+sockaddr_size);
2010 addr->sadb_address_len =
2011 (sizeof(struct sadb_address)+sockaddr_size)/
2012 sizeof(uint64_t);
2013 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2014 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2015 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2016 addr->sadb_address_reserved = 0;
2017 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2018 xp->selector.sport,
2019 (struct sockaddr *) (addr + 1),
2020 xp->family))
2021 BUG();
2022
2023 /* dst address */
2024 addr = (struct sadb_address*) skb_put(skb,
2025 sizeof(struct sadb_address)+sockaddr_size);
2026 addr->sadb_address_len =
2027 (sizeof(struct sadb_address)+sockaddr_size)/
2028 sizeof(uint64_t);
2029 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2030 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2031 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2032 addr->sadb_address_reserved = 0;
2033
2034 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2035 (struct sockaddr *) (addr + 1),
2036 xp->family);
2037
2038 /* hard time */
2039 lifetime = (struct sadb_lifetime *) skb_put(skb,
2040 sizeof(struct sadb_lifetime));
2041 lifetime->sadb_lifetime_len =
2042 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2043 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2044 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2045 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2046 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2047 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2048 /* soft time */
2049 lifetime = (struct sadb_lifetime *) skb_put(skb,
2050 sizeof(struct sadb_lifetime));
2051 lifetime->sadb_lifetime_len =
2052 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2053 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2054 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2055 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2056 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2057 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2058 /* current time */
2059 lifetime = (struct sadb_lifetime *) skb_put(skb,
2060 sizeof(struct sadb_lifetime));
2061 lifetime->sadb_lifetime_len =
2062 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2063 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2064 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2065 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2066 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2067 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2068
2069 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2070 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2071 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2072 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2073 if (xp->action == XFRM_POLICY_ALLOW) {
2074 if (xp->xfrm_nr)
2075 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2076 else
2077 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2078 }
2079 pol->sadb_x_policy_dir = dir+1;
2080 pol->sadb_x_policy_reserved = 0;
2081 pol->sadb_x_policy_id = xp->index;
2082 pol->sadb_x_policy_priority = xp->priority;
2083
2084 for (i=0; i<xp->xfrm_nr; i++) {
2085 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2086 struct sadb_x_ipsecrequest *rq;
2087 int req_size;
2088 int mode;
2089
2090 req_size = sizeof(struct sadb_x_ipsecrequest);
2091 if (t->mode == XFRM_MODE_TUNNEL) {
2092 socklen = pfkey_sockaddr_len(t->encap_family);
2093 req_size += socklen * 2;
2094 } else {
2095 size -= 2*socklen;
2096 }
2097 rq = (void*)skb_put(skb, req_size);
2098 pol->sadb_x_policy_len += req_size/8;
2099 memset(rq, 0, sizeof(*rq));
2100 rq->sadb_x_ipsecrequest_len = req_size;
2101 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2102 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2103 return -EINVAL;
2104 rq->sadb_x_ipsecrequest_mode = mode;
2105 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2106 if (t->reqid)
2107 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2108 if (t->optional)
2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2110 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2111
2112 if (t->mode == XFRM_MODE_TUNNEL) {
2113 u8 *sa = (void *)(rq + 1);
2114 pfkey_sockaddr_fill(&t->saddr, 0,
2115 (struct sockaddr *)sa,
2116 t->encap_family);
2117 pfkey_sockaddr_fill(&t->id.daddr, 0,
2118 (struct sockaddr *) (sa + socklen),
2119 t->encap_family);
2120 }
2121 }
2122
2123 /* security context */
2124 if ((xfrm_ctx = xp->security)) {
2125 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2126
2127 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2128 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2129 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2130 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2131 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2132 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2133 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2134 xfrm_ctx->ctx_len);
2135 }
2136
2137 hdr->sadb_msg_len = size / sizeof(uint64_t);
2138 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2139
2140 return 0;
2141 }
2142
2143 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2144 {
2145 struct sk_buff *out_skb;
2146 struct sadb_msg *out_hdr;
2147 int err;
2148
2149 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2150 if (IS_ERR(out_skb))
2151 return PTR_ERR(out_skb);
2152
2153 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2154 if (err < 0)
2155 return err;
2156
2157 out_hdr = (struct sadb_msg *) out_skb->data;
2158 out_hdr->sadb_msg_version = PF_KEY_V2;
2159
2160 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2161 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2162 else
2163 out_hdr->sadb_msg_type = event2poltype(c->event);
2164 out_hdr->sadb_msg_errno = 0;
2165 out_hdr->sadb_msg_seq = c->seq;
2166 out_hdr->sadb_msg_pid = c->portid;
2167 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2168 return 0;
2169
2170 }
2171
2172 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2173 {
2174 struct net *net = sock_net(sk);
2175 int err = 0;
2176 struct sadb_lifetime *lifetime;
2177 struct sadb_address *sa;
2178 struct sadb_x_policy *pol;
2179 struct xfrm_policy *xp;
2180 struct km_event c;
2181 struct sadb_x_sec_ctx *sec_ctx;
2182
2183 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2184 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2185 !ext_hdrs[SADB_X_EXT_POLICY-1])
2186 return -EINVAL;
2187
2188 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2189 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2190 return -EINVAL;
2191 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2192 return -EINVAL;
2193
2194 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2195 if (xp == NULL)
2196 return -ENOBUFS;
2197
2198 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2199 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2200 xp->priority = pol->sadb_x_policy_priority;
2201
2202 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2203 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2204 xp->selector.family = xp->family;
2205 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2206 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2207 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2208 if (xp->selector.sport)
2209 xp->selector.sport_mask = htons(0xffff);
2210
2211 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2212 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2213 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2214
2215 /* Amusing, we set this twice. KAME apps appear to set same value
2216 * in both addresses.
2217 */
2218 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2219
2220 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2221 if (xp->selector.dport)
2222 xp->selector.dport_mask = htons(0xffff);
2223
2224 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2225 if (sec_ctx != NULL) {
2226 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2227
2228 if (!uctx) {
2229 err = -ENOBUFS;
2230 goto out;
2231 }
2232
2233 err = security_xfrm_policy_alloc(&xp->security, uctx);
2234 kfree(uctx);
2235
2236 if (err)
2237 goto out;
2238 }
2239
2240 xp->lft.soft_byte_limit = XFRM_INF;
2241 xp->lft.hard_byte_limit = XFRM_INF;
2242 xp->lft.soft_packet_limit = XFRM_INF;
2243 xp->lft.hard_packet_limit = XFRM_INF;
2244 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2245 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2246 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2247 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2248 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2249 }
2250 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2251 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2252 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2253 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2254 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2255 }
2256 xp->xfrm_nr = 0;
2257 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2258 (err = parse_ipsecrequests(xp, pol)) < 0)
2259 goto out;
2260
2261 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2262 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2263
2264 xfrm_audit_policy_add(xp, err ? 0 : 1,
2265 audit_get_loginuid(current),
2266 audit_get_sessionid(current), 0);
2267
2268 if (err)
2269 goto out;
2270
2271 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2272 c.event = XFRM_MSG_UPDPOLICY;
2273 else
2274 c.event = XFRM_MSG_NEWPOLICY;
2275
2276 c.seq = hdr->sadb_msg_seq;
2277 c.portid = hdr->sadb_msg_pid;
2278
2279 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2280 xfrm_pol_put(xp);
2281 return 0;
2282
2283 out:
2284 xp->walk.dead = 1;
2285 xfrm_policy_destroy(xp);
2286 return err;
2287 }
2288
2289 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2290 {
2291 struct net *net = sock_net(sk);
2292 int err;
2293 struct sadb_address *sa;
2294 struct sadb_x_policy *pol;
2295 struct xfrm_policy *xp;
2296 struct xfrm_selector sel;
2297 struct km_event c;
2298 struct sadb_x_sec_ctx *sec_ctx;
2299 struct xfrm_sec_ctx *pol_ctx = NULL;
2300
2301 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2302 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2303 !ext_hdrs[SADB_X_EXT_POLICY-1])
2304 return -EINVAL;
2305
2306 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2307 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2308 return -EINVAL;
2309
2310 memset(&sel, 0, sizeof(sel));
2311
2312 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2313 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2314 sel.prefixlen_s = sa->sadb_address_prefixlen;
2315 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2316 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2317 if (sel.sport)
2318 sel.sport_mask = htons(0xffff);
2319
2320 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2321 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2322 sel.prefixlen_d = sa->sadb_address_prefixlen;
2323 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2324 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2325 if (sel.dport)
2326 sel.dport_mask = htons(0xffff);
2327
2328 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2329 if (sec_ctx != NULL) {
2330 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2331
2332 if (!uctx)
2333 return -ENOMEM;
2334
2335 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2336 kfree(uctx);
2337 if (err)
2338 return err;
2339 }
2340
2341 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2342 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2343 1, &err);
2344 security_xfrm_policy_free(pol_ctx);
2345 if (xp == NULL)
2346 return -ENOENT;
2347
2348 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2349 audit_get_loginuid(current),
2350 audit_get_sessionid(current), 0);
2351
2352 if (err)
2353 goto out;
2354
2355 c.seq = hdr->sadb_msg_seq;
2356 c.portid = hdr->sadb_msg_pid;
2357 c.data.byid = 0;
2358 c.event = XFRM_MSG_DELPOLICY;
2359 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2360
2361 out:
2362 xfrm_pol_put(xp);
2363 if (err == 0)
2364 xfrm_garbage_collect(net);
2365 return err;
2366 }
2367
2368 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2369 {
2370 int err;
2371 struct sk_buff *out_skb;
2372 struct sadb_msg *out_hdr;
2373 err = 0;
2374
2375 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2376 if (IS_ERR(out_skb)) {
2377 err = PTR_ERR(out_skb);
2378 goto out;
2379 }
2380 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2381 if (err < 0)
2382 goto out;
2383
2384 out_hdr = (struct sadb_msg *) out_skb->data;
2385 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2386 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2387 out_hdr->sadb_msg_satype = 0;
2388 out_hdr->sadb_msg_errno = 0;
2389 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2390 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2391 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2392 err = 0;
2393
2394 out:
2395 return err;
2396 }
2397
2398 #ifdef CONFIG_NET_KEY_MIGRATE
2399 static int pfkey_sockaddr_pair_size(sa_family_t family)
2400 {
2401 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2402 }
2403
2404 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2405 xfrm_address_t *saddr, xfrm_address_t *daddr,
2406 u16 *family)
2407 {
2408 int af, socklen;
2409
2410 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2411 return -EINVAL;
2412
2413 af = pfkey_sockaddr_extract(sa, saddr);
2414 if (!af)
2415 return -EINVAL;
2416
2417 socklen = pfkey_sockaddr_len(af);
2418 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2419 daddr) != af)
2420 return -EINVAL;
2421
2422 *family = af;
2423 return 0;
2424 }
2425
2426 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2427 struct xfrm_migrate *m)
2428 {
2429 int err;
2430 struct sadb_x_ipsecrequest *rq2;
2431 int mode;
2432
2433 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2434 len < rq1->sadb_x_ipsecrequest_len)
2435 return -EINVAL;
2436
2437 /* old endoints */
2438 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2439 rq1->sadb_x_ipsecrequest_len,
2440 &m->old_saddr, &m->old_daddr,
2441 &m->old_family);
2442 if (err)
2443 return err;
2444
2445 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2446 len -= rq1->sadb_x_ipsecrequest_len;
2447
2448 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2449 len < rq2->sadb_x_ipsecrequest_len)
2450 return -EINVAL;
2451
2452 /* new endpoints */
2453 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2454 rq2->sadb_x_ipsecrequest_len,
2455 &m->new_saddr, &m->new_daddr,
2456 &m->new_family);
2457 if (err)
2458 return err;
2459
2460 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2461 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2462 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2463 return -EINVAL;
2464
2465 m->proto = rq1->sadb_x_ipsecrequest_proto;
2466 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2467 return -EINVAL;
2468 m->mode = mode;
2469 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2470
2471 return ((int)(rq1->sadb_x_ipsecrequest_len +
2472 rq2->sadb_x_ipsecrequest_len));
2473 }
2474
2475 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2476 const struct sadb_msg *hdr, void * const *ext_hdrs)
2477 {
2478 int i, len, ret, err = -EINVAL;
2479 u8 dir;
2480 struct sadb_address *sa;
2481 struct sadb_x_kmaddress *kma;
2482 struct sadb_x_policy *pol;
2483 struct sadb_x_ipsecrequest *rq;
2484 struct xfrm_selector sel;
2485 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2486 struct xfrm_kmaddress k;
2487
2488 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2489 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2490 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2491 err = -EINVAL;
2492 goto out;
2493 }
2494
2495 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2496 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2497
2498 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2499 err = -EINVAL;
2500 goto out;
2501 }
2502
2503 if (kma) {
2504 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2505 k.reserved = kma->sadb_x_kmaddress_reserved;
2506 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2507 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2508 &k.local, &k.remote, &k.family);
2509 if (ret < 0) {
2510 err = ret;
2511 goto out;
2512 }
2513 }
2514
2515 dir = pol->sadb_x_policy_dir - 1;
2516 memset(&sel, 0, sizeof(sel));
2517
2518 /* set source address info of selector */
2519 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2520 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2521 sel.prefixlen_s = sa->sadb_address_prefixlen;
2522 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2523 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2524 if (sel.sport)
2525 sel.sport_mask = htons(0xffff);
2526
2527 /* set destination address info of selector */
2528 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2529 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2530 sel.prefixlen_d = sa->sadb_address_prefixlen;
2531 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2532 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2533 if (sel.dport)
2534 sel.dport_mask = htons(0xffff);
2535
2536 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2537
2538 /* extract ipsecrequests */
2539 i = 0;
2540 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2541
2542 while (len > 0 && i < XFRM_MAX_DEPTH) {
2543 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2544 if (ret < 0) {
2545 err = ret;
2546 goto out;
2547 } else {
2548 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2549 len -= ret;
2550 i++;
2551 }
2552 }
2553
2554 if (!i || len > 0) {
2555 err = -EINVAL;
2556 goto out;
2557 }
2558
2559 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2560 kma ? &k : NULL);
2561
2562 out:
2563 return err;
2564 }
2565 #else
2566 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2567 const struct sadb_msg *hdr, void * const *ext_hdrs)
2568 {
2569 return -ENOPROTOOPT;
2570 }
2571 #endif
2572
2573
2574 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2575 {
2576 struct net *net = sock_net(sk);
2577 unsigned int dir;
2578 int err = 0, delete;
2579 struct sadb_x_policy *pol;
2580 struct xfrm_policy *xp;
2581 struct km_event c;
2582
2583 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2584 return -EINVAL;
2585
2586 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2587 if (dir >= XFRM_POLICY_MAX)
2588 return -EINVAL;
2589
2590 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2591 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2592 dir, pol->sadb_x_policy_id, delete, &err);
2593 if (xp == NULL)
2594 return -ENOENT;
2595
2596 if (delete) {
2597 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2598 audit_get_loginuid(current),
2599 audit_get_sessionid(current), 0);
2600
2601 if (err)
2602 goto out;
2603 c.seq = hdr->sadb_msg_seq;
2604 c.portid = hdr->sadb_msg_pid;
2605 c.data.byid = 1;
2606 c.event = XFRM_MSG_DELPOLICY;
2607 km_policy_notify(xp, dir, &c);
2608 } else {
2609 err = key_pol_get_resp(sk, xp, hdr, dir);
2610 }
2611
2612 out:
2613 xfrm_pol_put(xp);
2614 if (delete && err == 0)
2615 xfrm_garbage_collect(net);
2616 return err;
2617 }
2618
2619 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2620 {
2621 struct pfkey_sock *pfk = ptr;
2622 struct sk_buff *out_skb;
2623 struct sadb_msg *out_hdr;
2624 int err;
2625
2626 if (!pfkey_can_dump(&pfk->sk))
2627 return -ENOBUFS;
2628
2629 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2630 if (IS_ERR(out_skb))
2631 return PTR_ERR(out_skb);
2632
2633 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2634 if (err < 0)
2635 return err;
2636
2637 out_hdr = (struct sadb_msg *) out_skb->data;
2638 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2639 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2640 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2641 out_hdr->sadb_msg_errno = 0;
2642 out_hdr->sadb_msg_seq = count + 1;
2643 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2644
2645 if (pfk->dump.skb)
2646 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2647 &pfk->sk, sock_net(&pfk->sk));
2648 pfk->dump.skb = out_skb;
2649
2650 return 0;
2651 }
2652
2653 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2654 {
2655 struct net *net = sock_net(&pfk->sk);
2656 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2657 }
2658
2659 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2660 {
2661 xfrm_policy_walk_done(&pfk->dump.u.policy);
2662 }
2663
2664 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2665 {
2666 struct pfkey_sock *pfk = pfkey_sk(sk);
2667
2668 if (pfk->dump.dump != NULL)
2669 return -EBUSY;
2670
2671 pfk->dump.msg_version = hdr->sadb_msg_version;
2672 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2673 pfk->dump.dump = pfkey_dump_sp;
2674 pfk->dump.done = pfkey_dump_sp_done;
2675 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2676
2677 return pfkey_do_dump(pfk);
2678 }
2679
2680 static int key_notify_policy_flush(const struct km_event *c)
2681 {
2682 struct sk_buff *skb_out;
2683 struct sadb_msg *hdr;
2684
2685 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2686 if (!skb_out)
2687 return -ENOBUFS;
2688 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2689 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2690 hdr->sadb_msg_seq = c->seq;
2691 hdr->sadb_msg_pid = c->portid;
2692 hdr->sadb_msg_version = PF_KEY_V2;
2693 hdr->sadb_msg_errno = (uint8_t) 0;
2694 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2695 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2696 hdr->sadb_msg_reserved = 0;
2697 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2698 return 0;
2699
2700 }
2701
2702 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2703 {
2704 struct net *net = sock_net(sk);
2705 struct km_event c;
2706 struct xfrm_audit audit_info;
2707 int err, err2;
2708
2709 audit_info.loginuid = audit_get_loginuid(current);
2710 audit_info.sessionid = audit_get_sessionid(current);
2711 audit_info.secid = 0;
2712 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2713 err2 = unicast_flush_resp(sk, hdr);
2714 if (err || err2) {
2715 if (err == -ESRCH) /* empty table - old silent behavior */
2716 return 0;
2717 return err;
2718 }
2719
2720 c.data.type = XFRM_POLICY_TYPE_MAIN;
2721 c.event = XFRM_MSG_FLUSHPOLICY;
2722 c.portid = hdr->sadb_msg_pid;
2723 c.seq = hdr->sadb_msg_seq;
2724 c.net = net;
2725 km_policy_notify(NULL, 0, &c);
2726
2727 return 0;
2728 }
2729
2730 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2731 const struct sadb_msg *hdr, void * const *ext_hdrs);
2732 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2733 [SADB_RESERVED] = pfkey_reserved,
2734 [SADB_GETSPI] = pfkey_getspi,
2735 [SADB_UPDATE] = pfkey_add,
2736 [SADB_ADD] = pfkey_add,
2737 [SADB_DELETE] = pfkey_delete,
2738 [SADB_GET] = pfkey_get,
2739 [SADB_ACQUIRE] = pfkey_acquire,
2740 [SADB_REGISTER] = pfkey_register,
2741 [SADB_EXPIRE] = NULL,
2742 [SADB_FLUSH] = pfkey_flush,
2743 [SADB_DUMP] = pfkey_dump,
2744 [SADB_X_PROMISC] = pfkey_promisc,
2745 [SADB_X_PCHANGE] = NULL,
2746 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2747 [SADB_X_SPDADD] = pfkey_spdadd,
2748 [SADB_X_SPDDELETE] = pfkey_spddelete,
2749 [SADB_X_SPDGET] = pfkey_spdget,
2750 [SADB_X_SPDACQUIRE] = NULL,
2751 [SADB_X_SPDDUMP] = pfkey_spddump,
2752 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2753 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2754 [SADB_X_SPDDELETE2] = pfkey_spdget,
2755 [SADB_X_MIGRATE] = pfkey_migrate,
2756 };
2757
2758 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2759 {
2760 void *ext_hdrs[SADB_EXT_MAX];
2761 int err;
2762
2763 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2764 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2765
2766 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2767 err = parse_exthdrs(skb, hdr, ext_hdrs);
2768 if (!err) {
2769 err = -EOPNOTSUPP;
2770 if (pfkey_funcs[hdr->sadb_msg_type])
2771 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2772 }
2773 return err;
2774 }
2775
2776 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2777 {
2778 struct sadb_msg *hdr = NULL;
2779
2780 if (skb->len < sizeof(*hdr)) {
2781 *errp = -EMSGSIZE;
2782 } else {
2783 hdr = (struct sadb_msg *) skb->data;
2784 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2785 hdr->sadb_msg_reserved != 0 ||
2786 (hdr->sadb_msg_type <= SADB_RESERVED ||
2787 hdr->sadb_msg_type > SADB_MAX)) {
2788 hdr = NULL;
2789 *errp = -EINVAL;
2790 } else if (hdr->sadb_msg_len != (skb->len /
2791 sizeof(uint64_t)) ||
2792 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2793 sizeof(uint64_t))) {
2794 hdr = NULL;
2795 *errp = -EMSGSIZE;
2796 } else {
2797 *errp = 0;
2798 }
2799 }
2800 return hdr;
2801 }
2802
2803 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2804 const struct xfrm_algo_desc *d)
2805 {
2806 unsigned int id = d->desc.sadb_alg_id;
2807
2808 if (id >= sizeof(t->aalgos) * 8)
2809 return 0;
2810
2811 return (t->aalgos >> id) & 1;
2812 }
2813
2814 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2815 const struct xfrm_algo_desc *d)
2816 {
2817 unsigned int id = d->desc.sadb_alg_id;
2818
2819 if (id >= sizeof(t->ealgos) * 8)
2820 return 0;
2821
2822 return (t->ealgos >> id) & 1;
2823 }
2824
2825 static int count_ah_combs(const struct xfrm_tmpl *t)
2826 {
2827 int i, sz = 0;
2828
2829 for (i = 0; ; i++) {
2830 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2831 if (!aalg)
2832 break;
2833 if (!aalg->pfkey_supported)
2834 continue;
2835 if (aalg_tmpl_set(t, aalg) && aalg->available)
2836 sz += sizeof(struct sadb_comb);
2837 }
2838 return sz + sizeof(struct sadb_prop);
2839 }
2840
2841 static int count_esp_combs(const struct xfrm_tmpl *t)
2842 {
2843 int i, k, sz = 0;
2844
2845 for (i = 0; ; i++) {
2846 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2847 if (!ealg)
2848 break;
2849
2850 if (!ealg->pfkey_supported)
2851 continue;
2852
2853 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2854 continue;
2855
2856 for (k = 1; ; k++) {
2857 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2858 if (!aalg)
2859 break;
2860
2861 if (!aalg->pfkey_supported)
2862 continue;
2863
2864 if (aalg_tmpl_set(t, aalg) && aalg->available)
2865 sz += sizeof(struct sadb_comb);
2866 }
2867 }
2868 return sz + sizeof(struct sadb_prop);
2869 }
2870
2871 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2872 {
2873 struct sadb_prop *p;
2874 int i;
2875
2876 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2877 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2878 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2879 p->sadb_prop_replay = 32;
2880 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2881
2882 for (i = 0; ; i++) {
2883 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2884 if (!aalg)
2885 break;
2886
2887 if (!aalg->pfkey_supported)
2888 continue;
2889
2890 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2891 struct sadb_comb *c;
2892 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2893 memset(c, 0, sizeof(*c));
2894 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2895 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2896 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2897 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2898 c->sadb_comb_hard_addtime = 24*60*60;
2899 c->sadb_comb_soft_addtime = 20*60*60;
2900 c->sadb_comb_hard_usetime = 8*60*60;
2901 c->sadb_comb_soft_usetime = 7*60*60;
2902 }
2903 }
2904 }
2905
2906 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2907 {
2908 struct sadb_prop *p;
2909 int i, k;
2910
2911 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2912 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2913 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2914 p->sadb_prop_replay = 32;
2915 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2916
2917 for (i=0; ; i++) {
2918 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2919 if (!ealg)
2920 break;
2921
2922 if (!ealg->pfkey_supported)
2923 continue;
2924
2925 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2926 continue;
2927
2928 for (k = 1; ; k++) {
2929 struct sadb_comb *c;
2930 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931 if (!aalg)
2932 break;
2933 if (!aalg->pfkey_supported)
2934 continue;
2935 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2936 continue;
2937 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2938 memset(c, 0, sizeof(*c));
2939 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2940 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2941 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2942 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2943 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2944 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2945 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2946 c->sadb_comb_hard_addtime = 24*60*60;
2947 c->sadb_comb_soft_addtime = 20*60*60;
2948 c->sadb_comb_hard_usetime = 8*60*60;
2949 c->sadb_comb_soft_usetime = 7*60*60;
2950 }
2951 }
2952 }
2953
2954 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2955 {
2956 return 0;
2957 }
2958
2959 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2960 {
2961 struct sk_buff *out_skb;
2962 struct sadb_msg *out_hdr;
2963 int hard;
2964 int hsc;
2965
2966 hard = c->data.hard;
2967 if (hard)
2968 hsc = 2;
2969 else
2970 hsc = 1;
2971
2972 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2973 if (IS_ERR(out_skb))
2974 return PTR_ERR(out_skb);
2975
2976 out_hdr = (struct sadb_msg *) out_skb->data;
2977 out_hdr->sadb_msg_version = PF_KEY_V2;
2978 out_hdr->sadb_msg_type = SADB_EXPIRE;
2979 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2980 out_hdr->sadb_msg_errno = 0;
2981 out_hdr->sadb_msg_reserved = 0;
2982 out_hdr->sadb_msg_seq = 0;
2983 out_hdr->sadb_msg_pid = 0;
2984
2985 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2986 return 0;
2987 }
2988
2989 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2990 {
2991 struct net *net = x ? xs_net(x) : c->net;
2992 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2993
2994 if (atomic_read(&net_pfkey->socks_nr) == 0)
2995 return 0;
2996
2997 switch (c->event) {
2998 case XFRM_MSG_EXPIRE:
2999 return key_notify_sa_expire(x, c);
3000 case XFRM_MSG_DELSA:
3001 case XFRM_MSG_NEWSA:
3002 case XFRM_MSG_UPDSA:
3003 return key_notify_sa(x, c);
3004 case XFRM_MSG_FLUSHSA:
3005 return key_notify_sa_flush(c);
3006 case XFRM_MSG_NEWAE: /* not yet supported */
3007 break;
3008 default:
3009 pr_err("pfkey: Unknown SA event %d\n", c->event);
3010 break;
3011 }
3012
3013 return 0;
3014 }
3015
3016 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3017 {
3018 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3019 return 0;
3020
3021 switch (c->event) {
3022 case XFRM_MSG_POLEXPIRE:
3023 return key_notify_policy_expire(xp, c);
3024 case XFRM_MSG_DELPOLICY:
3025 case XFRM_MSG_NEWPOLICY:
3026 case XFRM_MSG_UPDPOLICY:
3027 return key_notify_policy(xp, dir, c);
3028 case XFRM_MSG_FLUSHPOLICY:
3029 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3030 break;
3031 return key_notify_policy_flush(c);
3032 default:
3033 pr_err("pfkey: Unknown policy event %d\n", c->event);
3034 break;
3035 }
3036
3037 return 0;
3038 }
3039
3040 static u32 get_acqseq(void)
3041 {
3042 u32 res;
3043 static atomic_t acqseq;
3044
3045 do {
3046 res = atomic_inc_return(&acqseq);
3047 } while (!res);
3048 return res;
3049 }
3050
3051 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3052 {
3053 struct sk_buff *skb;
3054 struct sadb_msg *hdr;
3055 struct sadb_address *addr;
3056 struct sadb_x_policy *pol;
3057 int sockaddr_size;
3058 int size;
3059 struct sadb_x_sec_ctx *sec_ctx;
3060 struct xfrm_sec_ctx *xfrm_ctx;
3061 int ctx_size = 0;
3062
3063 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3064 if (!sockaddr_size)
3065 return -EINVAL;
3066
3067 size = sizeof(struct sadb_msg) +
3068 (sizeof(struct sadb_address) * 2) +
3069 (sockaddr_size * 2) +
3070 sizeof(struct sadb_x_policy);
3071
3072 if (x->id.proto == IPPROTO_AH)
3073 size += count_ah_combs(t);
3074 else if (x->id.proto == IPPROTO_ESP)
3075 size += count_esp_combs(t);
3076
3077 if ((xfrm_ctx = x->security)) {
3078 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3079 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3080 }
3081
3082 skb = alloc_skb(size + 16, GFP_ATOMIC);
3083 if (skb == NULL)
3084 return -ENOMEM;
3085
3086 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3087 hdr->sadb_msg_version = PF_KEY_V2;
3088 hdr->sadb_msg_type = SADB_ACQUIRE;
3089 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3090 hdr->sadb_msg_len = size / sizeof(uint64_t);
3091 hdr->sadb_msg_errno = 0;
3092 hdr->sadb_msg_reserved = 0;
3093 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3094 hdr->sadb_msg_pid = 0;
3095
3096 /* src address */
3097 addr = (struct sadb_address*) skb_put(skb,
3098 sizeof(struct sadb_address)+sockaddr_size);
3099 addr->sadb_address_len =
3100 (sizeof(struct sadb_address)+sockaddr_size)/
3101 sizeof(uint64_t);
3102 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3103 addr->sadb_address_proto = 0;
3104 addr->sadb_address_reserved = 0;
3105 addr->sadb_address_prefixlen =
3106 pfkey_sockaddr_fill(&x->props.saddr, 0,
3107 (struct sockaddr *) (addr + 1),
3108 x->props.family);
3109 if (!addr->sadb_address_prefixlen)
3110 BUG();
3111
3112 /* dst address */
3113 addr = (struct sadb_address*) skb_put(skb,
3114 sizeof(struct sadb_address)+sockaddr_size);
3115 addr->sadb_address_len =
3116 (sizeof(struct sadb_address)+sockaddr_size)/
3117 sizeof(uint64_t);
3118 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3119 addr->sadb_address_proto = 0;
3120 addr->sadb_address_reserved = 0;
3121 addr->sadb_address_prefixlen =
3122 pfkey_sockaddr_fill(&x->id.daddr, 0,
3123 (struct sockaddr *) (addr + 1),
3124 x->props.family);
3125 if (!addr->sadb_address_prefixlen)
3126 BUG();
3127
3128 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3129 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3130 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3131 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3132 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3133 pol->sadb_x_policy_reserved = 0;
3134 pol->sadb_x_policy_id = xp->index;
3135 pol->sadb_x_policy_priority = xp->priority;
3136
3137 /* Set sadb_comb's. */
3138 if (x->id.proto == IPPROTO_AH)
3139 dump_ah_combs(skb, t);
3140 else if (x->id.proto == IPPROTO_ESP)
3141 dump_esp_combs(skb, t);
3142
3143 /* security context */
3144 if (xfrm_ctx) {
3145 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3146 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3147 sec_ctx->sadb_x_sec_len =
3148 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3149 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3150 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3151 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3152 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3153 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3154 xfrm_ctx->ctx_len);
3155 }
3156
3157 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3158 }
3159
3160 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3161 u8 *data, int len, int *dir)
3162 {
3163 struct net *net = sock_net(sk);
3164 struct xfrm_policy *xp;
3165 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3166 struct sadb_x_sec_ctx *sec_ctx;
3167
3168 switch (sk->sk_family) {
3169 case AF_INET:
3170 if (opt != IP_IPSEC_POLICY) {
3171 *dir = -EOPNOTSUPP;
3172 return NULL;
3173 }
3174 break;
3175 #if IS_ENABLED(CONFIG_IPV6)
3176 case AF_INET6:
3177 if (opt != IPV6_IPSEC_POLICY) {
3178 *dir = -EOPNOTSUPP;
3179 return NULL;
3180 }
3181 break;
3182 #endif
3183 default:
3184 *dir = -EINVAL;
3185 return NULL;
3186 }
3187
3188 *dir = -EINVAL;
3189
3190 if (len < sizeof(struct sadb_x_policy) ||
3191 pol->sadb_x_policy_len*8 > len ||
3192 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3193 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3194 return NULL;
3195
3196 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3197 if (xp == NULL) {
3198 *dir = -ENOBUFS;
3199 return NULL;
3200 }
3201
3202 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3203 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3204
3205 xp->lft.soft_byte_limit = XFRM_INF;
3206 xp->lft.hard_byte_limit = XFRM_INF;
3207 xp->lft.soft_packet_limit = XFRM_INF;
3208 xp->lft.hard_packet_limit = XFRM_INF;
3209 xp->family = sk->sk_family;
3210
3211 xp->xfrm_nr = 0;
3212 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3213 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3214 goto out;
3215
3216 /* security context too */
3217 if (len >= (pol->sadb_x_policy_len*8 +
3218 sizeof(struct sadb_x_sec_ctx))) {
3219 char *p = (char *)pol;
3220 struct xfrm_user_sec_ctx *uctx;
3221
3222 p += pol->sadb_x_policy_len*8;
3223 sec_ctx = (struct sadb_x_sec_ctx *)p;
3224 if (len < pol->sadb_x_policy_len*8 +
3225 sec_ctx->sadb_x_sec_len) {
3226 *dir = -EINVAL;
3227 goto out;
3228 }
3229 if ((*dir = verify_sec_ctx_len(p)))
3230 goto out;
3231 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3232 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3233 kfree(uctx);
3234
3235 if (*dir)
3236 goto out;
3237 }
3238
3239 *dir = pol->sadb_x_policy_dir-1;
3240 return xp;
3241
3242 out:
3243 xp->walk.dead = 1;
3244 xfrm_policy_destroy(xp);
3245 return NULL;
3246 }
3247
3248 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3249 {
3250 struct sk_buff *skb;
3251 struct sadb_msg *hdr;
3252 struct sadb_sa *sa;
3253 struct sadb_address *addr;
3254 struct sadb_x_nat_t_port *n_port;
3255 int sockaddr_size;
3256 int size;
3257 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3258 struct xfrm_encap_tmpl *natt = NULL;
3259
3260 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3261 if (!sockaddr_size)
3262 return -EINVAL;
3263
3264 if (!satype)
3265 return -EINVAL;
3266
3267 if (!x->encap)
3268 return -EINVAL;
3269
3270 natt = x->encap;
3271
3272 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3273 *
3274 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3275 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3276 */
3277
3278 size = sizeof(struct sadb_msg) +
3279 sizeof(struct sadb_sa) +
3280 (sizeof(struct sadb_address) * 2) +
3281 (sockaddr_size * 2) +
3282 (sizeof(struct sadb_x_nat_t_port) * 2);
3283
3284 skb = alloc_skb(size + 16, GFP_ATOMIC);
3285 if (skb == NULL)
3286 return -ENOMEM;
3287
3288 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3289 hdr->sadb_msg_version = PF_KEY_V2;
3290 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3291 hdr->sadb_msg_satype = satype;
3292 hdr->sadb_msg_len = size / sizeof(uint64_t);
3293 hdr->sadb_msg_errno = 0;
3294 hdr->sadb_msg_reserved = 0;
3295 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3296 hdr->sadb_msg_pid = 0;
3297
3298 /* SA */
3299 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3300 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3301 sa->sadb_sa_exttype = SADB_EXT_SA;
3302 sa->sadb_sa_spi = x->id.spi;
3303 sa->sadb_sa_replay = 0;
3304 sa->sadb_sa_state = 0;
3305 sa->sadb_sa_auth = 0;
3306 sa->sadb_sa_encrypt = 0;
3307 sa->sadb_sa_flags = 0;
3308
3309 /* ADDRESS_SRC (old addr) */
3310 addr = (struct sadb_address*)
3311 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3312 addr->sadb_address_len =
3313 (sizeof(struct sadb_address)+sockaddr_size)/
3314 sizeof(uint64_t);
3315 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3316 addr->sadb_address_proto = 0;
3317 addr->sadb_address_reserved = 0;
3318 addr->sadb_address_prefixlen =
3319 pfkey_sockaddr_fill(&x->props.saddr, 0,
3320 (struct sockaddr *) (addr + 1),
3321 x->props.family);
3322 if (!addr->sadb_address_prefixlen)
3323 BUG();
3324
3325 /* NAT_T_SPORT (old port) */
3326 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3327 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3328 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3329 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3330 n_port->sadb_x_nat_t_port_reserved = 0;
3331
3332 /* ADDRESS_DST (new addr) */
3333 addr = (struct sadb_address*)
3334 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3335 addr->sadb_address_len =
3336 (sizeof(struct sadb_address)+sockaddr_size)/
3337 sizeof(uint64_t);
3338 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3339 addr->sadb_address_proto = 0;
3340 addr->sadb_address_reserved = 0;
3341 addr->sadb_address_prefixlen =
3342 pfkey_sockaddr_fill(ipaddr, 0,
3343 (struct sockaddr *) (addr + 1),
3344 x->props.family);
3345 if (!addr->sadb_address_prefixlen)
3346 BUG();
3347
3348 /* NAT_T_DPORT (new port) */
3349 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3350 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3351 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3352 n_port->sadb_x_nat_t_port_port = sport;
3353 n_port->sadb_x_nat_t_port_reserved = 0;
3354
3355 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3356 }
3357
3358 #ifdef CONFIG_NET_KEY_MIGRATE
3359 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3360 const struct xfrm_selector *sel)
3361 {
3362 struct sadb_address *addr;
3363 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3364 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3365 addr->sadb_address_exttype = type;
3366 addr->sadb_address_proto = sel->proto;
3367 addr->sadb_address_reserved = 0;
3368
3369 switch (type) {
3370 case SADB_EXT_ADDRESS_SRC:
3371 addr->sadb_address_prefixlen = sel->prefixlen_s;
3372 pfkey_sockaddr_fill(&sel->saddr, 0,
3373 (struct sockaddr *)(addr + 1),
3374 sel->family);
3375 break;
3376 case SADB_EXT_ADDRESS_DST:
3377 addr->sadb_address_prefixlen = sel->prefixlen_d;
3378 pfkey_sockaddr_fill(&sel->daddr, 0,
3379 (struct sockaddr *)(addr + 1),
3380 sel->family);
3381 break;
3382 default:
3383 return -EINVAL;
3384 }
3385
3386 return 0;
3387 }
3388
3389
3390 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3391 {
3392 struct sadb_x_kmaddress *kma;
3393 u8 *sa;
3394 int family = k->family;
3395 int socklen = pfkey_sockaddr_len(family);
3396 int size_req;
3397
3398 size_req = (sizeof(struct sadb_x_kmaddress) +
3399 pfkey_sockaddr_pair_size(family));
3400
3401 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3402 memset(kma, 0, size_req);
3403 kma->sadb_x_kmaddress_len = size_req / 8;
3404 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3405 kma->sadb_x_kmaddress_reserved = k->reserved;
3406
3407 sa = (u8 *)(kma + 1);
3408 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3409 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3410 return -EINVAL;
3411
3412 return 0;
3413 }
3414
3415 static int set_ipsecrequest(struct sk_buff *skb,
3416 uint8_t proto, uint8_t mode, int level,
3417 uint32_t reqid, uint8_t family,
3418 const xfrm_address_t *src, const xfrm_address_t *dst)
3419 {
3420 struct sadb_x_ipsecrequest *rq;
3421 u8 *sa;
3422 int socklen = pfkey_sockaddr_len(family);
3423 int size_req;
3424
3425 size_req = sizeof(struct sadb_x_ipsecrequest) +
3426 pfkey_sockaddr_pair_size(family);
3427
3428 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3429 memset(rq, 0, size_req);
3430 rq->sadb_x_ipsecrequest_len = size_req;
3431 rq->sadb_x_ipsecrequest_proto = proto;
3432 rq->sadb_x_ipsecrequest_mode = mode;
3433 rq->sadb_x_ipsecrequest_level = level;
3434 rq->sadb_x_ipsecrequest_reqid = reqid;
3435
3436 sa = (u8 *) (rq + 1);
3437 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3438 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3439 return -EINVAL;
3440
3441 return 0;
3442 }
3443 #endif
3444
3445 #ifdef CONFIG_NET_KEY_MIGRATE
3446 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3447 const struct xfrm_migrate *m, int num_bundles,
3448 const struct xfrm_kmaddress *k)
3449 {
3450 int i;
3451 int sasize_sel;
3452 int size = 0;
3453 int size_pol = 0;
3454 struct sk_buff *skb;
3455 struct sadb_msg *hdr;
3456 struct sadb_x_policy *pol;
3457 const struct xfrm_migrate *mp;
3458
3459 if (type != XFRM_POLICY_TYPE_MAIN)
3460 return 0;
3461
3462 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3463 return -EINVAL;
3464
3465 if (k != NULL) {
3466 /* addresses for KM */
3467 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3468 pfkey_sockaddr_pair_size(k->family));
3469 }
3470
3471 /* selector */
3472 sasize_sel = pfkey_sockaddr_size(sel->family);
3473 if (!sasize_sel)
3474 return -EINVAL;
3475 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3476
3477 /* policy info */
3478 size_pol += sizeof(struct sadb_x_policy);
3479
3480 /* ipsecrequests */
3481 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3482 /* old locator pair */
3483 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3484 pfkey_sockaddr_pair_size(mp->old_family);
3485 /* new locator pair */
3486 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3487 pfkey_sockaddr_pair_size(mp->new_family);
3488 }
3489
3490 size += sizeof(struct sadb_msg) + size_pol;
3491
3492 /* alloc buffer */
3493 skb = alloc_skb(size, GFP_ATOMIC);
3494 if (skb == NULL)
3495 return -ENOMEM;
3496
3497 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3498 hdr->sadb_msg_version = PF_KEY_V2;
3499 hdr->sadb_msg_type = SADB_X_MIGRATE;
3500 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3501 hdr->sadb_msg_len = size / 8;
3502 hdr->sadb_msg_errno = 0;
3503 hdr->sadb_msg_reserved = 0;
3504 hdr->sadb_msg_seq = 0;
3505 hdr->sadb_msg_pid = 0;
3506
3507 /* Addresses to be used by KM for negotiation, if ext is available */
3508 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3509 goto err;
3510
3511 /* selector src */
3512 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3513
3514 /* selector dst */
3515 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3516
3517 /* policy information */
3518 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3519 pol->sadb_x_policy_len = size_pol / 8;
3520 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3521 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3522 pol->sadb_x_policy_dir = dir + 1;
3523 pol->sadb_x_policy_reserved = 0;
3524 pol->sadb_x_policy_id = 0;
3525 pol->sadb_x_policy_priority = 0;
3526
3527 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3528 /* old ipsecrequest */
3529 int mode = pfkey_mode_from_xfrm(mp->mode);
3530 if (mode < 0)
3531 goto err;
3532 if (set_ipsecrequest(skb, mp->proto, mode,
3533 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3534 mp->reqid, mp->old_family,
3535 &mp->old_saddr, &mp->old_daddr) < 0)
3536 goto err;
3537
3538 /* new ipsecrequest */
3539 if (set_ipsecrequest(skb, mp->proto, mode,
3540 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3541 mp->reqid, mp->new_family,
3542 &mp->new_saddr, &mp->new_daddr) < 0)
3543 goto err;
3544 }
3545
3546 /* broadcast migrate message to sockets */
3547 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3548
3549 return 0;
3550
3551 err:
3552 kfree_skb(skb);
3553 return -EINVAL;
3554 }
3555 #else
3556 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3557 const struct xfrm_migrate *m, int num_bundles,
3558 const struct xfrm_kmaddress *k)
3559 {
3560 return -ENOPROTOOPT;
3561 }
3562 #endif
3563
3564 static int pfkey_sendmsg(struct kiocb *kiocb,
3565 struct socket *sock, struct msghdr *msg, size_t len)
3566 {
3567 struct sock *sk = sock->sk;
3568 struct sk_buff *skb = NULL;
3569 struct sadb_msg *hdr = NULL;
3570 int err;
3571
3572 err = -EOPNOTSUPP;
3573 if (msg->msg_flags & MSG_OOB)
3574 goto out;
3575
3576 err = -EMSGSIZE;
3577 if ((unsigned int)len > sk->sk_sndbuf - 32)
3578 goto out;
3579
3580 err = -ENOBUFS;
3581 skb = alloc_skb(len, GFP_KERNEL);
3582 if (skb == NULL)
3583 goto out;
3584
3585 err = -EFAULT;
3586 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3587 goto out;
3588
3589 hdr = pfkey_get_base_msg(skb, &err);
3590 if (!hdr)
3591 goto out;
3592
3593 mutex_lock(&xfrm_cfg_mutex);
3594 err = pfkey_process(sk, skb, hdr);
3595 mutex_unlock(&xfrm_cfg_mutex);
3596
3597 out:
3598 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3599 err = 0;
3600 kfree_skb(skb);
3601
3602 return err ? : len;
3603 }
3604
3605 static int pfkey_recvmsg(struct kiocb *kiocb,
3606 struct socket *sock, struct msghdr *msg, size_t len,
3607 int flags)
3608 {
3609 struct sock *sk = sock->sk;
3610 struct pfkey_sock *pfk = pfkey_sk(sk);
3611 struct sk_buff *skb;
3612 int copied, err;
3613
3614 err = -EINVAL;
3615 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3616 goto out;
3617
3618 msg->msg_namelen = 0;
3619 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3620 if (skb == NULL)
3621 goto out;
3622
3623 copied = skb->len;
3624 if (copied > len) {
3625 msg->msg_flags |= MSG_TRUNC;
3626 copied = len;
3627 }
3628
3629 skb_reset_transport_header(skb);
3630 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3631 if (err)
3632 goto out_free;
3633
3634 sock_recv_ts_and_drops(msg, sk, skb);
3635
3636 err = (flags & MSG_TRUNC) ? skb->len : copied;
3637
3638 if (pfk->dump.dump != NULL &&
3639 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3640 pfkey_do_dump(pfk);
3641
3642 out_free:
3643 skb_free_datagram(sk, skb);
3644 out:
3645 return err;
3646 }
3647
3648 static const struct proto_ops pfkey_ops = {
3649 .family = PF_KEY,
3650 .owner = THIS_MODULE,
3651 /* Operations that make no sense on pfkey sockets. */
3652 .bind = sock_no_bind,
3653 .connect = sock_no_connect,
3654 .socketpair = sock_no_socketpair,
3655 .accept = sock_no_accept,
3656 .getname = sock_no_getname,
3657 .ioctl = sock_no_ioctl,
3658 .listen = sock_no_listen,
3659 .shutdown = sock_no_shutdown,
3660 .setsockopt = sock_no_setsockopt,
3661 .getsockopt = sock_no_getsockopt,
3662 .mmap = sock_no_mmap,
3663 .sendpage = sock_no_sendpage,
3664
3665 /* Now the operations that really occur. */
3666 .release = pfkey_release,
3667 .poll = datagram_poll,
3668 .sendmsg = pfkey_sendmsg,
3669 .recvmsg = pfkey_recvmsg,
3670 };
3671
3672 static const struct net_proto_family pfkey_family_ops = {
3673 .family = PF_KEY,
3674 .create = pfkey_create,
3675 .owner = THIS_MODULE,
3676 };
3677
3678 #ifdef CONFIG_PROC_FS
3679 static int pfkey_seq_show(struct seq_file *f, void *v)
3680 {
3681 struct sock *s = sk_entry(v);
3682
3683 if (v == SEQ_START_TOKEN)
3684 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3685 else
3686 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3687 s,
3688 atomic_read(&s->sk_refcnt),
3689 sk_rmem_alloc_get(s),
3690 sk_wmem_alloc_get(s),
3691 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3692 sock_i_ino(s)
3693 );
3694 return 0;
3695 }
3696
3697 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3698 __acquires(rcu)
3699 {
3700 struct net *net = seq_file_net(f);
3701 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3702
3703 rcu_read_lock();
3704 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3705 }
3706
3707 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3708 {
3709 struct net *net = seq_file_net(f);
3710 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3711
3712 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3713 }
3714
3715 static void pfkey_seq_stop(struct seq_file *f, void *v)
3716 __releases(rcu)
3717 {
3718 rcu_read_unlock();
3719 }
3720
3721 static const struct seq_operations pfkey_seq_ops = {
3722 .start = pfkey_seq_start,
3723 .next = pfkey_seq_next,
3724 .stop = pfkey_seq_stop,
3725 .show = pfkey_seq_show,
3726 };
3727
3728 static int pfkey_seq_open(struct inode *inode, struct file *file)
3729 {
3730 return seq_open_net(inode, file, &pfkey_seq_ops,
3731 sizeof(struct seq_net_private));
3732 }
3733
3734 static const struct file_operations pfkey_proc_ops = {
3735 .open = pfkey_seq_open,
3736 .read = seq_read,
3737 .llseek = seq_lseek,
3738 .release = seq_release_net,
3739 };
3740
3741 static int __net_init pfkey_init_proc(struct net *net)
3742 {
3743 struct proc_dir_entry *e;
3744
3745 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3746 if (e == NULL)
3747 return -ENOMEM;
3748
3749 return 0;
3750 }
3751
3752 static void __net_exit pfkey_exit_proc(struct net *net)
3753 {
3754 remove_proc_entry("pfkey", net->proc_net);
3755 }
3756 #else
3757 static inline int pfkey_init_proc(struct net *net)
3758 {
3759 return 0;
3760 }
3761
3762 static inline void pfkey_exit_proc(struct net *net)
3763 {
3764 }
3765 #endif
3766
3767 static struct xfrm_mgr pfkeyv2_mgr =
3768 {
3769 .id = "pfkeyv2",
3770 .notify = pfkey_send_notify,
3771 .acquire = pfkey_send_acquire,
3772 .compile_policy = pfkey_compile_policy,
3773 .new_mapping = pfkey_send_new_mapping,
3774 .notify_policy = pfkey_send_policy_notify,
3775 .migrate = pfkey_send_migrate,
3776 };
3777
3778 static int __net_init pfkey_net_init(struct net *net)
3779 {
3780 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3781 int rv;
3782
3783 INIT_HLIST_HEAD(&net_pfkey->table);
3784 atomic_set(&net_pfkey->socks_nr, 0);
3785
3786 rv = pfkey_init_proc(net);
3787
3788 return rv;
3789 }
3790
3791 static void __net_exit pfkey_net_exit(struct net *net)
3792 {
3793 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3794
3795 pfkey_exit_proc(net);
3796 BUG_ON(!hlist_empty(&net_pfkey->table));
3797 }
3798
3799 static struct pernet_operations pfkey_net_ops = {
3800 .init = pfkey_net_init,
3801 .exit = pfkey_net_exit,
3802 .id = &pfkey_net_id,
3803 .size = sizeof(struct netns_pfkey),
3804 };
3805
3806 static void __exit ipsec_pfkey_exit(void)
3807 {
3808 xfrm_unregister_km(&pfkeyv2_mgr);
3809 sock_unregister(PF_KEY);
3810 unregister_pernet_subsys(&pfkey_net_ops);
3811 proto_unregister(&key_proto);
3812 }
3813
3814 static int __init ipsec_pfkey_init(void)
3815 {
3816 int err = proto_register(&key_proto, 0);
3817
3818 if (err != 0)
3819 goto out;
3820
3821 err = register_pernet_subsys(&pfkey_net_ops);
3822 if (err != 0)
3823 goto out_unregister_key_proto;
3824 err = sock_register(&pfkey_family_ops);
3825 if (err != 0)
3826 goto out_unregister_pernet;
3827 err = xfrm_register_km(&pfkeyv2_mgr);
3828 if (err != 0)
3829 goto out_sock_unregister;
3830 out:
3831 return err;
3832
3833 out_sock_unregister:
3834 sock_unregister(PF_KEY);
3835 out_unregister_pernet:
3836 unregister_pernet_subsys(&pfkey_net_ops);
3837 out_unregister_key_proto:
3838 proto_unregister(&key_proto);
3839 goto out;
3840 }
3841
3842 module_init(ipsec_pfkey_init);
3843 module_exit(ipsec_pfkey_exit);
3844 MODULE_LICENSE("GPL");
3845 MODULE_ALIAS_NETPROTO(PF_KEY);
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