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Merge branch 'pci/resource' into next
[deliverable/linux.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145 return -EPERM;
146 if (sock->type != SOCK_RAW)
147 return -ESOCKTNOSUPPORT;
148 if (protocol != PF_KEY_V2)
149 return -EPROTONOSUPPORT;
150
151 err = -ENOMEM;
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153 if (sk == NULL)
154 goto out;
155
156 sock->ops = &pfkey_ops;
157 sock_init_data(sock, sk);
158
159 sk->sk_family = PF_KEY;
160 sk->sk_destruct = pfkey_sock_destruct;
161
162 atomic_inc(&net_pfkey->socks_nr);
163
164 pfkey_insert(sk);
165
166 return 0;
167 out:
168 return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173 struct sock *sk = sock->sk;
174
175 if (!sk)
176 return 0;
177
178 pfkey_remove(sk);
179
180 sock_orphan(sk);
181 sock->sk = NULL;
182 skb_queue_purge(&sk->sk_write_queue);
183
184 synchronize_rcu();
185 sock_put(sk);
186
187 return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191 gfp_t allocation, struct sock *sk)
192 {
193 int err = -ENOBUFS;
194
195 sock_hold(sk);
196 if (*skb2 == NULL) {
197 if (atomic_read(&skb->users) != 1) {
198 *skb2 = skb_clone(skb, allocation);
199 } else {
200 *skb2 = skb;
201 atomic_inc(&skb->users);
202 }
203 }
204 if (*skb2 != NULL) {
205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206 skb_set_owner_r(*skb2, sk);
207 skb_queue_tail(&sk->sk_receive_queue, *skb2);
208 sk->sk_data_ready(sk, (*skb2)->len);
209 *skb2 = NULL;
210 err = 0;
211 }
212 }
213 sock_put(sk);
214 return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria. */
218 #define BROADCAST_ALL 0
219 #define BROADCAST_ONE 1
220 #define BROADCAST_REGISTERED 2
221 #define BROADCAST_PROMISC_ONLY 4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223 int broadcast_flags, struct sock *one_sk,
224 struct net *net)
225 {
226 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227 struct sock *sk;
228 struct sk_buff *skb2 = NULL;
229 int err = -ESRCH;
230
231 /* XXX Do we need something like netlink_overrun? I think
232 * XXX PF_KEY socket apps will not mind current behavior.
233 */
234 if (!skb)
235 return -ENOMEM;
236
237 rcu_read_lock();
238 sk_for_each_rcu(sk, &net_pfkey->table) {
239 struct pfkey_sock *pfk = pfkey_sk(sk);
240 int err2;
241
242 /* Yes, it means that if you are meant to receive this
243 * pfkey message you receive it twice as promiscuous
244 * socket.
245 */
246 if (pfk->promisc)
247 pfkey_broadcast_one(skb, &skb2, allocation, sk);
248
249 /* the exact target will be processed later */
250 if (sk == one_sk)
251 continue;
252 if (broadcast_flags != BROADCAST_ALL) {
253 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254 continue;
255 if ((broadcast_flags & BROADCAST_REGISTERED) &&
256 !pfk->registered)
257 continue;
258 if (broadcast_flags & BROADCAST_ONE)
259 continue;
260 }
261
262 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263
264 /* Error is cleare after succecful sending to at least one
265 * registered KM */
266 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267 err = err2;
268 }
269 rcu_read_unlock();
270
271 if (one_sk != NULL)
272 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273
274 kfree_skb(skb2);
275 kfree_skb(skb);
276 return err;
277 }
278
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281 struct sadb_msg *hdr;
282 int rc;
283
284 rc = pfk->dump.dump(pfk);
285 if (rc == -ENOBUFS)
286 return 0;
287
288 if (pfk->dump.skb) {
289 if (!pfkey_can_dump(&pfk->sk))
290 return 0;
291
292 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293 hdr->sadb_msg_seq = 0;
294 hdr->sadb_msg_errno = rc;
295 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296 &pfk->sk, sock_net(&pfk->sk));
297 pfk->dump.skb = NULL;
298 }
299
300 pfkey_terminate_dump(pfk);
301 return rc;
302 }
303
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305 const struct sadb_msg *orig)
306 {
307 *new = *orig;
308 }
309
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313 struct sadb_msg *hdr;
314
315 if (!skb)
316 return -ENOBUFS;
317
318 /* Woe be to the platform trying to support PFKEY yet
319 * having normal errnos outside the 1-255 range, inclusive.
320 */
321 err = -err;
322 if (err == ERESTARTSYS ||
323 err == ERESTARTNOHAND ||
324 err == ERESTARTNOINTR)
325 err = EINTR;
326 if (err >= 512)
327 err = EINVAL;
328 BUG_ON(err <= 0 || err >= 256);
329
330 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331 pfkey_hdr_dup(hdr, orig);
332 hdr->sadb_msg_errno = (uint8_t) err;
333 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334 sizeof(uint64_t));
335
336 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338 return 0;
339 }
340
341 static const u8 sadb_ext_min_len[] = {
342 [SADB_EXT_RESERVED] = (u8) 0,
343 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
344 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
345 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
346 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
348 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
349 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
351 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
352 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
353 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
354 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
355 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
356 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
357 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
358 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
359 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
360 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
361 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
362 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
363 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
364 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
365 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
366 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
367 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family. */
371 static int verify_address_len(const void *p)
372 {
373 const struct sadb_address *sp = p;
374 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
375 const struct sockaddr_in *sin;
376 #if IS_ENABLED(CONFIG_IPV6)
377 const struct sockaddr_in6 *sin6;
378 #endif
379 int len;
380
381 switch (addr->sa_family) {
382 case AF_INET:
383 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384 if (sp->sadb_address_len != len ||
385 sp->sadb_address_prefixlen > 32)
386 return -EINVAL;
387 break;
388 #if IS_ENABLED(CONFIG_IPV6)
389 case AF_INET6:
390 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391 if (sp->sadb_address_len != len ||
392 sp->sadb_address_prefixlen > 128)
393 return -EINVAL;
394 break;
395 #endif
396 default:
397 /* It is user using kernel to keep track of security
398 * associations for another protocol, such as
399 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
400 * lengths.
401 *
402 * XXX Actually, association/policy database is not yet
403 * XXX able to cope with arbitrary sockaddr families.
404 * XXX When it can, remove this -EINVAL. -DaveM
405 */
406 return -EINVAL;
407 break;
408 }
409
410 return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
414 {
415 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416 sec_ctx->sadb_x_ctx_len,
417 sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(const void *p)
421 {
422 const struct sadb_x_sec_ctx *sec_ctx = p;
423 int len = sec_ctx->sadb_x_ctx_len;
424
425 if (len > PAGE_SIZE)
426 return -EINVAL;
427
428 len = pfkey_sec_ctx_len(sec_ctx);
429
430 if (sec_ctx->sadb_x_sec_len != len)
431 return -EINVAL;
432
433 return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
437 {
438 struct xfrm_user_sec_ctx *uctx = NULL;
439 int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443 if (!uctx)
444 return NULL;
445
446 uctx->len = pfkey_sec_ctx_len(sec_ctx);
447 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451 memcpy(uctx + 1, sec_ctx + 1,
452 uctx->ctx_len);
453
454 return uctx;
455 }
456
457 static int present_and_same_family(const struct sadb_address *src,
458 const struct sadb_address *dst)
459 {
460 const struct sockaddr *s_addr, *d_addr;
461
462 if (!src || !dst)
463 return 0;
464
465 s_addr = (const struct sockaddr *)(src + 1);
466 d_addr = (const struct sockaddr *)(dst + 1);
467 if (s_addr->sa_family != d_addr->sa_family)
468 return 0;
469 if (s_addr->sa_family != AF_INET
470 #if IS_ENABLED(CONFIG_IPV6)
471 && s_addr->sa_family != AF_INET6
472 #endif
473 )
474 return 0;
475
476 return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
480 {
481 const char *p = (char *) hdr;
482 int len = skb->len;
483
484 len -= sizeof(*hdr);
485 p += sizeof(*hdr);
486 while (len > 0) {
487 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
488 uint16_t ext_type;
489 int ext_len;
490
491 ext_len = ehdr->sadb_ext_len;
492 ext_len *= sizeof(uint64_t);
493 ext_type = ehdr->sadb_ext_type;
494 if (ext_len < sizeof(uint64_t) ||
495 ext_len > len ||
496 ext_type == SADB_EXT_RESERVED)
497 return -EINVAL;
498
499 if (ext_type <= SADB_EXT_MAX) {
500 int min = (int) sadb_ext_min_len[ext_type];
501 if (ext_len < min)
502 return -EINVAL;
503 if (ext_hdrs[ext_type-1] != NULL)
504 return -EINVAL;
505 if (ext_type == SADB_EXT_ADDRESS_SRC ||
506 ext_type == SADB_EXT_ADDRESS_DST ||
507 ext_type == SADB_EXT_ADDRESS_PROXY ||
508 ext_type == SADB_X_EXT_NAT_T_OA) {
509 if (verify_address_len(p))
510 return -EINVAL;
511 }
512 if (ext_type == SADB_X_EXT_SEC_CTX) {
513 if (verify_sec_ctx_len(p))
514 return -EINVAL;
515 }
516 ext_hdrs[ext_type-1] = (void *) p;
517 }
518 p += ext_len;
519 len -= ext_len;
520 }
521
522 return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528 switch (satype) {
529 case SADB_SATYPE_UNSPEC:
530 return IPSEC_PROTO_ANY;
531 case SADB_SATYPE_AH:
532 return IPPROTO_AH;
533 case SADB_SATYPE_ESP:
534 return IPPROTO_ESP;
535 case SADB_X_SATYPE_IPCOMP:
536 return IPPROTO_COMP;
537 break;
538 default:
539 return 0;
540 }
541 /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547 switch (proto) {
548 case IPPROTO_AH:
549 return SADB_SATYPE_AH;
550 case IPPROTO_ESP:
551 return SADB_SATYPE_ESP;
552 case IPPROTO_COMP:
553 return SADB_X_SATYPE_IPCOMP;
554 break;
555 default:
556 return 0;
557 }
558 /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562 * say specifically 'just raw sockets' as we encode them as 255.
563 */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567 return proto == IPSEC_PROTO_ANY ? 0 : proto;
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572 return proto ? proto : IPSEC_PROTO_ANY;
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577 switch (family) {
578 case AF_INET:
579 return sizeof(struct sockaddr_in);
580 #if IS_ENABLED(CONFIG_IPV6)
581 case AF_INET6:
582 return sizeof(struct sockaddr_in6);
583 #endif
584 }
585 return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591 switch (sa->sa_family) {
592 case AF_INET:
593 xaddr->a4 =
594 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595 return AF_INET;
596 #if IS_ENABLED(CONFIG_IPV6)
597 case AF_INET6:
598 memcpy(xaddr->a6,
599 &((struct sockaddr_in6 *)sa)->sin6_addr,
600 sizeof(struct in6_addr));
601 return AF_INET6;
602 #endif
603 }
604 return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611 xaddr);
612 }
613
614 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
615 {
616 const struct sadb_sa *sa;
617 const struct sadb_address *addr;
618 uint16_t proto;
619 unsigned short family;
620 xfrm_address_t *xaddr;
621
622 sa = ext_hdrs[SADB_EXT_SA - 1];
623 if (sa == NULL)
624 return NULL;
625
626 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627 if (proto == 0)
628 return NULL;
629
630 /* sadb_address_len should be checked by caller */
631 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
632 if (addr == NULL)
633 return NULL;
634
635 family = ((const struct sockaddr *)(addr + 1))->sa_family;
636 switch (family) {
637 case AF_INET:
638 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
639 break;
640 #if IS_ENABLED(CONFIG_IPV6)
641 case AF_INET6:
642 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643 break;
644 #endif
645 default:
646 xaddr = NULL;
647 }
648
649 if (!xaddr)
650 return NULL;
651
652 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665 switch(mode) {
666 case XFRM_MODE_TRANSPORT:
667 return IPSEC_MODE_TRANSPORT;
668 case XFRM_MODE_TUNNEL:
669 return IPSEC_MODE_TUNNEL;
670 case XFRM_MODE_BEET:
671 return IPSEC_MODE_BEET;
672 default:
673 return -1;
674 }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679 switch(mode) {
680 case IPSEC_MODE_ANY: /*XXX*/
681 case IPSEC_MODE_TRANSPORT:
682 return XFRM_MODE_TRANSPORT;
683 case IPSEC_MODE_TUNNEL:
684 return XFRM_MODE_TUNNEL;
685 case IPSEC_MODE_BEET:
686 return XFRM_MODE_BEET;
687 default:
688 return -1;
689 }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
693 struct sockaddr *sa,
694 unsigned short family)
695 {
696 switch (family) {
697 case AF_INET:
698 {
699 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700 sin->sin_family = AF_INET;
701 sin->sin_port = port;
702 sin->sin_addr.s_addr = xaddr->a4;
703 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704 return 32;
705 }
706 #if IS_ENABLED(CONFIG_IPV6)
707 case AF_INET6:
708 {
709 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710 sin6->sin6_family = AF_INET6;
711 sin6->sin6_port = port;
712 sin6->sin6_flowinfo = 0;
713 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
714 sin6->sin6_scope_id = 0;
715 return 128;
716 }
717 #endif
718 }
719 return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
723 int add_keys, int hsc)
724 {
725 struct sk_buff *skb;
726 struct sadb_msg *hdr;
727 struct sadb_sa *sa;
728 struct sadb_lifetime *lifetime;
729 struct sadb_address *addr;
730 struct sadb_key *key;
731 struct sadb_x_sa2 *sa2;
732 struct sadb_x_sec_ctx *sec_ctx;
733 struct xfrm_sec_ctx *xfrm_ctx;
734 int ctx_size = 0;
735 int size;
736 int auth_key_size = 0;
737 int encrypt_key_size = 0;
738 int sockaddr_size;
739 struct xfrm_encap_tmpl *natt = NULL;
740 int mode;
741
742 /* address family check */
743 sockaddr_size = pfkey_sockaddr_size(x->props.family);
744 if (!sockaddr_size)
745 return ERR_PTR(-EINVAL);
746
747 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748 key(AE), (identity(SD),) (sensitivity)> */
749 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750 sizeof(struct sadb_lifetime) +
751 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753 sizeof(struct sadb_address)*2 +
754 sockaddr_size*2 +
755 sizeof(struct sadb_x_sa2);
756
757 if ((xfrm_ctx = x->security)) {
758 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760 }
761
762 /* identity & sensitivity */
763 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
764 size += sizeof(struct sadb_address) + sockaddr_size;
765
766 if (add_keys) {
767 if (x->aalg && x->aalg->alg_key_len) {
768 auth_key_size =
769 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770 size += sizeof(struct sadb_key) + auth_key_size;
771 }
772 if (x->ealg && x->ealg->alg_key_len) {
773 encrypt_key_size =
774 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775 size += sizeof(struct sadb_key) + encrypt_key_size;
776 }
777 }
778 if (x->encap)
779 natt = x->encap;
780
781 if (natt && natt->encap_type) {
782 size += sizeof(struct sadb_x_nat_t_type);
783 size += sizeof(struct sadb_x_nat_t_port);
784 size += sizeof(struct sadb_x_nat_t_port);
785 }
786
787 skb = alloc_skb(size + 16, GFP_ATOMIC);
788 if (skb == NULL)
789 return ERR_PTR(-ENOBUFS);
790
791 /* call should fill header later */
792 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793 memset(hdr, 0, size); /* XXX do we need this ? */
794 hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796 /* sa */
797 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
798 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799 sa->sadb_sa_exttype = SADB_EXT_SA;
800 sa->sadb_sa_spi = x->id.spi;
801 sa->sadb_sa_replay = x->props.replay_window;
802 switch (x->km.state) {
803 case XFRM_STATE_VALID:
804 sa->sadb_sa_state = x->km.dying ?
805 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806 break;
807 case XFRM_STATE_ACQ:
808 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809 break;
810 default:
811 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812 break;
813 }
814 sa->sadb_sa_auth = 0;
815 if (x->aalg) {
816 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
818 a->desc.sadb_alg_id : 0;
819 }
820 sa->sadb_sa_encrypt = 0;
821 BUG_ON(x->ealg && x->calg);
822 if (x->ealg) {
823 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
824 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
825 a->desc.sadb_alg_id : 0;
826 }
827 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
828 if (x->calg) {
829 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
830 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
831 a->desc.sadb_alg_id : 0;
832 }
833
834 sa->sadb_sa_flags = 0;
835 if (x->props.flags & XFRM_STATE_NOECN)
836 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
837 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
838 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
839 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
840 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
841
842 /* hard time */
843 if (hsc & 2) {
844 lifetime = (struct sadb_lifetime *) skb_put(skb,
845 sizeof(struct sadb_lifetime));
846 lifetime->sadb_lifetime_len =
847 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
848 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
849 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
850 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
851 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
852 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
853 }
854 /* soft time */
855 if (hsc & 1) {
856 lifetime = (struct sadb_lifetime *) skb_put(skb,
857 sizeof(struct sadb_lifetime));
858 lifetime->sadb_lifetime_len =
859 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
860 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
861 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
862 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
863 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
864 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
865 }
866 /* current time */
867 lifetime = (struct sadb_lifetime *) skb_put(skb,
868 sizeof(struct sadb_lifetime));
869 lifetime->sadb_lifetime_len =
870 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
871 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
872 lifetime->sadb_lifetime_allocations = x->curlft.packets;
873 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
874 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
875 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
876 /* src address */
877 addr = (struct sadb_address*) skb_put(skb,
878 sizeof(struct sadb_address)+sockaddr_size);
879 addr->sadb_address_len =
880 (sizeof(struct sadb_address)+sockaddr_size)/
881 sizeof(uint64_t);
882 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
883 /* "if the ports are non-zero, then the sadb_address_proto field,
884 normally zero, MUST be filled in with the transport
885 protocol's number." - RFC2367 */
886 addr->sadb_address_proto = 0;
887 addr->sadb_address_reserved = 0;
888
889 addr->sadb_address_prefixlen =
890 pfkey_sockaddr_fill(&x->props.saddr, 0,
891 (struct sockaddr *) (addr + 1),
892 x->props.family);
893 if (!addr->sadb_address_prefixlen)
894 BUG();
895
896 /* dst address */
897 addr = (struct sadb_address*) skb_put(skb,
898 sizeof(struct sadb_address)+sockaddr_size);
899 addr->sadb_address_len =
900 (sizeof(struct sadb_address)+sockaddr_size)/
901 sizeof(uint64_t);
902 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
903 addr->sadb_address_proto = 0;
904 addr->sadb_address_reserved = 0;
905
906 addr->sadb_address_prefixlen =
907 pfkey_sockaddr_fill(&x->id.daddr, 0,
908 (struct sockaddr *) (addr + 1),
909 x->props.family);
910 if (!addr->sadb_address_prefixlen)
911 BUG();
912
913 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
914 x->props.family)) {
915 addr = (struct sadb_address*) skb_put(skb,
916 sizeof(struct sadb_address)+sockaddr_size);
917 addr->sadb_address_len =
918 (sizeof(struct sadb_address)+sockaddr_size)/
919 sizeof(uint64_t);
920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
921 addr->sadb_address_proto =
922 pfkey_proto_from_xfrm(x->sel.proto);
923 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
924 addr->sadb_address_reserved = 0;
925
926 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
927 (struct sockaddr *) (addr + 1),
928 x->props.family);
929 }
930
931 /* auth key */
932 if (add_keys && auth_key_size) {
933 key = (struct sadb_key *) skb_put(skb,
934 sizeof(struct sadb_key)+auth_key_size);
935 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
936 sizeof(uint64_t);
937 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
938 key->sadb_key_bits = x->aalg->alg_key_len;
939 key->sadb_key_reserved = 0;
940 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
941 }
942 /* encrypt key */
943 if (add_keys && encrypt_key_size) {
944 key = (struct sadb_key *) skb_put(skb,
945 sizeof(struct sadb_key)+encrypt_key_size);
946 key->sadb_key_len = (sizeof(struct sadb_key) +
947 encrypt_key_size) / sizeof(uint64_t);
948 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
949 key->sadb_key_bits = x->ealg->alg_key_len;
950 key->sadb_key_reserved = 0;
951 memcpy(key + 1, x->ealg->alg_key,
952 (x->ealg->alg_key_len+7)/8);
953 }
954
955 /* sa */
956 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
957 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
958 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
959 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
960 kfree_skb(skb);
961 return ERR_PTR(-EINVAL);
962 }
963 sa2->sadb_x_sa2_mode = mode;
964 sa2->sadb_x_sa2_reserved1 = 0;
965 sa2->sadb_x_sa2_reserved2 = 0;
966 sa2->sadb_x_sa2_sequence = 0;
967 sa2->sadb_x_sa2_reqid = x->props.reqid;
968
969 if (natt && natt->encap_type) {
970 struct sadb_x_nat_t_type *n_type;
971 struct sadb_x_nat_t_port *n_port;
972
973 /* type */
974 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
975 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
976 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
977 n_type->sadb_x_nat_t_type_type = natt->encap_type;
978 n_type->sadb_x_nat_t_type_reserved[0] = 0;
979 n_type->sadb_x_nat_t_type_reserved[1] = 0;
980 n_type->sadb_x_nat_t_type_reserved[2] = 0;
981
982 /* source port */
983 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
984 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
985 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
986 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
987 n_port->sadb_x_nat_t_port_reserved = 0;
988
989 /* dest port */
990 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
991 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
992 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
993 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
994 n_port->sadb_x_nat_t_port_reserved = 0;
995 }
996
997 /* security context */
998 if (xfrm_ctx) {
999 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001 sec_ctx->sadb_x_sec_len =
1002 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008 xfrm_ctx->ctx_len);
1009 }
1010
1011 return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017 struct sk_buff *skb;
1018
1019 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021 return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025 int hsc)
1026 {
1027 return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031 const struct sadb_msg *hdr,
1032 void * const *ext_hdrs)
1033 {
1034 struct xfrm_state *x;
1035 const struct sadb_lifetime *lifetime;
1036 const struct sadb_sa *sa;
1037 const struct sadb_key *key;
1038 const struct sadb_x_sec_ctx *sec_ctx;
1039 uint16_t proto;
1040 int err;
1041
1042
1043 sa = ext_hdrs[SADB_EXT_SA - 1];
1044 if (!sa ||
1045 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047 return ERR_PTR(-EINVAL);
1048 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050 return ERR_PTR(-EINVAL);
1051 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053 return ERR_PTR(-EINVAL);
1054 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056 return ERR_PTR(-EINVAL);
1057
1058 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059 if (proto == 0)
1060 return ERR_PTR(-EINVAL);
1061
1062 /* default error is no buffer space */
1063 err = -ENOBUFS;
1064
1065 /* RFC2367:
1066
1067 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072 not true.
1073
1074 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076 */
1077 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081 return ERR_PTR(-EINVAL);
1082 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083 if (key != NULL &&
1084 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085 ((key->sadb_key_bits+7) / 8 == 0 ||
1086 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087 return ERR_PTR(-EINVAL);
1088 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089 if (key != NULL &&
1090 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091 ((key->sadb_key_bits+7) / 8 == 0 ||
1092 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093 return ERR_PTR(-EINVAL);
1094
1095 x = xfrm_state_alloc(net);
1096 if (x == NULL)
1097 return ERR_PTR(-ENOBUFS);
1098
1099 x->id.proto = proto;
1100 x->id.spi = sa->sadb_sa_spi;
1101 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1102 (sizeof(x->replay.bitmap) * 8));
1103 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1104 x->props.flags |= XFRM_STATE_NOECN;
1105 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1106 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1107 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1108 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1109
1110 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1111 if (lifetime != NULL) {
1112 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1113 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1114 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1115 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1116 }
1117 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1118 if (lifetime != NULL) {
1119 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1120 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1121 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1122 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1123 }
1124
1125 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126 if (sec_ctx != NULL) {
1127 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1128
1129 if (!uctx)
1130 goto out;
1131
1132 err = security_xfrm_state_alloc(x, uctx);
1133 kfree(uctx);
1134
1135 if (err)
1136 goto out;
1137 }
1138
1139 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1140 if (sa->sadb_sa_auth) {
1141 int keysize = 0;
1142 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143 if (!a || !a->pfkey_supported) {
1144 err = -ENOSYS;
1145 goto out;
1146 }
1147 if (key)
1148 keysize = (key->sadb_key_bits + 7) / 8;
1149 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1150 if (!x->aalg)
1151 goto out;
1152 strcpy(x->aalg->alg_name, a->name);
1153 x->aalg->alg_key_len = 0;
1154 if (key) {
1155 x->aalg->alg_key_len = key->sadb_key_bits;
1156 memcpy(x->aalg->alg_key, key+1, keysize);
1157 }
1158 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1159 x->props.aalgo = sa->sadb_sa_auth;
1160 /* x->algo.flags = sa->sadb_sa_flags; */
1161 }
1162 if (sa->sadb_sa_encrypt) {
1163 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1164 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1165 if (!a || !a->pfkey_supported) {
1166 err = -ENOSYS;
1167 goto out;
1168 }
1169 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1170 if (!x->calg)
1171 goto out;
1172 strcpy(x->calg->alg_name, a->name);
1173 x->props.calgo = sa->sadb_sa_encrypt;
1174 } else {
1175 int keysize = 0;
1176 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1177 if (!a || !a->pfkey_supported) {
1178 err = -ENOSYS;
1179 goto out;
1180 }
1181 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1182 if (key)
1183 keysize = (key->sadb_key_bits + 7) / 8;
1184 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1185 if (!x->ealg)
1186 goto out;
1187 strcpy(x->ealg->alg_name, a->name);
1188 x->ealg->alg_key_len = 0;
1189 if (key) {
1190 x->ealg->alg_key_len = key->sadb_key_bits;
1191 memcpy(x->ealg->alg_key, key+1, keysize);
1192 }
1193 x->props.ealgo = sa->sadb_sa_encrypt;
1194 }
1195 }
1196 /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199 &x->props.saddr);
1200 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201 &x->id.daddr);
1202
1203 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206 if (mode < 0) {
1207 err = -EINVAL;
1208 goto out;
1209 }
1210 x->props.mode = mode;
1211 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212 }
1213
1214 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217 /* Nobody uses this, but we try. */
1218 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220 }
1221
1222 if (!x->sel.family)
1223 x->sel.family = x->props.family;
1224
1225 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226 const struct sadb_x_nat_t_type* n_type;
1227 struct xfrm_encap_tmpl *natt;
1228
1229 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230 if (!x->encap)
1231 goto out;
1232
1233 natt = x->encap;
1234 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238 const struct sadb_x_nat_t_port *n_port =
1239 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241 }
1242 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243 const struct sadb_x_nat_t_port *n_port =
1244 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246 }
1247 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248 }
1249
1250 err = xfrm_init_state(x);
1251 if (err)
1252 goto out;
1253
1254 x->km.seq = hdr->sadb_msg_seq;
1255 return x;
1256
1257 out:
1258 x->km.state = XFRM_STATE_DEAD;
1259 xfrm_state_put(x);
1260 return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265 return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270 struct net *net = sock_net(sk);
1271 struct sk_buff *resp_skb;
1272 struct sadb_x_sa2 *sa2;
1273 struct sadb_address *saddr, *daddr;
1274 struct sadb_msg *out_hdr;
1275 struct sadb_spirange *range;
1276 struct xfrm_state *x = NULL;
1277 int mode;
1278 int err;
1279 u32 min_spi, max_spi;
1280 u32 reqid;
1281 u8 proto;
1282 unsigned short family;
1283 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287 return -EINVAL;
1288
1289 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290 if (proto == 0)
1291 return -EINVAL;
1292
1293 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295 if (mode < 0)
1296 return -EINVAL;
1297 reqid = sa2->sadb_x_sa2_reqid;
1298 } else {
1299 mode = 0;
1300 reqid = 0;
1301 }
1302
1303 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307 switch (family) {
1308 case AF_INET:
1309 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313 case AF_INET6:
1314 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316 break;
1317 #endif
1318 }
1319
1320 if (hdr->sadb_msg_seq) {
1321 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323 xfrm_state_put(x);
1324 x = NULL;
1325 }
1326 }
1327
1328 if (!x)
1329 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331 if (x == NULL)
1332 return -ENOENT;
1333
1334 min_spi = 0x100;
1335 max_spi = 0x0fffffff;
1336
1337 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338 if (range) {
1339 min_spi = range->sadb_spirange_min;
1340 max_spi = range->sadb_spirange_max;
1341 }
1342
1343 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1344 if (err) {
1345 xfrm_state_put(x);
1346 return err;
1347 }
1348
1349 err = xfrm_alloc_spi(x, min_spi, max_spi);
1350 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1351
1352 if (IS_ERR(resp_skb)) {
1353 xfrm_state_put(x);
1354 return PTR_ERR(resp_skb);
1355 }
1356
1357 out_hdr = (struct sadb_msg *) resp_skb->data;
1358 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1359 out_hdr->sadb_msg_type = SADB_GETSPI;
1360 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1361 out_hdr->sadb_msg_errno = 0;
1362 out_hdr->sadb_msg_reserved = 0;
1363 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1364 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1365
1366 xfrm_state_put(x);
1367
1368 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1369
1370 return 0;
1371 }
1372
1373 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1374 {
1375 struct net *net = sock_net(sk);
1376 struct xfrm_state *x;
1377
1378 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1379 return -EOPNOTSUPP;
1380
1381 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1382 return 0;
1383
1384 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1385 if (x == NULL)
1386 return 0;
1387
1388 spin_lock_bh(&x->lock);
1389 if (x->km.state == XFRM_STATE_ACQ)
1390 x->km.state = XFRM_STATE_ERROR;
1391
1392 spin_unlock_bh(&x->lock);
1393 xfrm_state_put(x);
1394 return 0;
1395 }
1396
1397 static inline int event2poltype(int event)
1398 {
1399 switch (event) {
1400 case XFRM_MSG_DELPOLICY:
1401 return SADB_X_SPDDELETE;
1402 case XFRM_MSG_NEWPOLICY:
1403 return SADB_X_SPDADD;
1404 case XFRM_MSG_UPDPOLICY:
1405 return SADB_X_SPDUPDATE;
1406 case XFRM_MSG_POLEXPIRE:
1407 // return SADB_X_SPDEXPIRE;
1408 default:
1409 pr_err("pfkey: Unknown policy event %d\n", event);
1410 break;
1411 }
1412
1413 return 0;
1414 }
1415
1416 static inline int event2keytype(int event)
1417 {
1418 switch (event) {
1419 case XFRM_MSG_DELSA:
1420 return SADB_DELETE;
1421 case XFRM_MSG_NEWSA:
1422 return SADB_ADD;
1423 case XFRM_MSG_UPDSA:
1424 return SADB_UPDATE;
1425 case XFRM_MSG_EXPIRE:
1426 return SADB_EXPIRE;
1427 default:
1428 pr_err("pfkey: Unknown SA event %d\n", event);
1429 break;
1430 }
1431
1432 return 0;
1433 }
1434
1435 /* ADD/UPD/DEL */
1436 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1437 {
1438 struct sk_buff *skb;
1439 struct sadb_msg *hdr;
1440
1441 skb = pfkey_xfrm_state2msg(x);
1442
1443 if (IS_ERR(skb))
1444 return PTR_ERR(skb);
1445
1446 hdr = (struct sadb_msg *) skb->data;
1447 hdr->sadb_msg_version = PF_KEY_V2;
1448 hdr->sadb_msg_type = event2keytype(c->event);
1449 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1450 hdr->sadb_msg_errno = 0;
1451 hdr->sadb_msg_reserved = 0;
1452 hdr->sadb_msg_seq = c->seq;
1453 hdr->sadb_msg_pid = c->portid;
1454
1455 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1456
1457 return 0;
1458 }
1459
1460 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1461 {
1462 struct net *net = sock_net(sk);
1463 struct xfrm_state *x;
1464 int err;
1465 struct km_event c;
1466
1467 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1468 if (IS_ERR(x))
1469 return PTR_ERR(x);
1470
1471 xfrm_state_hold(x);
1472 if (hdr->sadb_msg_type == SADB_ADD)
1473 err = xfrm_state_add(x);
1474 else
1475 err = xfrm_state_update(x);
1476
1477 xfrm_audit_state_add(x, err ? 0 : 1,
1478 audit_get_loginuid(current),
1479 audit_get_sessionid(current), 0);
1480
1481 if (err < 0) {
1482 x->km.state = XFRM_STATE_DEAD;
1483 __xfrm_state_put(x);
1484 goto out;
1485 }
1486
1487 if (hdr->sadb_msg_type == SADB_ADD)
1488 c.event = XFRM_MSG_NEWSA;
1489 else
1490 c.event = XFRM_MSG_UPDSA;
1491 c.seq = hdr->sadb_msg_seq;
1492 c.portid = hdr->sadb_msg_pid;
1493 km_state_notify(x, &c);
1494 out:
1495 xfrm_state_put(x);
1496 return err;
1497 }
1498
1499 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1500 {
1501 struct net *net = sock_net(sk);
1502 struct xfrm_state *x;
1503 struct km_event c;
1504 int err;
1505
1506 if (!ext_hdrs[SADB_EXT_SA-1] ||
1507 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1508 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1509 return -EINVAL;
1510
1511 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1512 if (x == NULL)
1513 return -ESRCH;
1514
1515 if ((err = security_xfrm_state_delete(x)))
1516 goto out;
1517
1518 if (xfrm_state_kern(x)) {
1519 err = -EPERM;
1520 goto out;
1521 }
1522
1523 err = xfrm_state_delete(x);
1524
1525 if (err < 0)
1526 goto out;
1527
1528 c.seq = hdr->sadb_msg_seq;
1529 c.portid = hdr->sadb_msg_pid;
1530 c.event = XFRM_MSG_DELSA;
1531 km_state_notify(x, &c);
1532 out:
1533 xfrm_audit_state_delete(x, err ? 0 : 1,
1534 audit_get_loginuid(current),
1535 audit_get_sessionid(current), 0);
1536 xfrm_state_put(x);
1537
1538 return err;
1539 }
1540
1541 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1542 {
1543 struct net *net = sock_net(sk);
1544 __u8 proto;
1545 struct sk_buff *out_skb;
1546 struct sadb_msg *out_hdr;
1547 struct xfrm_state *x;
1548
1549 if (!ext_hdrs[SADB_EXT_SA-1] ||
1550 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1551 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1552 return -EINVAL;
1553
1554 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1555 if (x == NULL)
1556 return -ESRCH;
1557
1558 out_skb = pfkey_xfrm_state2msg(x);
1559 proto = x->id.proto;
1560 xfrm_state_put(x);
1561 if (IS_ERR(out_skb))
1562 return PTR_ERR(out_skb);
1563
1564 out_hdr = (struct sadb_msg *) out_skb->data;
1565 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1566 out_hdr->sadb_msg_type = SADB_GET;
1567 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1568 out_hdr->sadb_msg_errno = 0;
1569 out_hdr->sadb_msg_reserved = 0;
1570 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1571 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1572 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1573
1574 return 0;
1575 }
1576
1577 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1578 gfp_t allocation)
1579 {
1580 struct sk_buff *skb;
1581 struct sadb_msg *hdr;
1582 int len, auth_len, enc_len, i;
1583
1584 auth_len = xfrm_count_pfkey_auth_supported();
1585 if (auth_len) {
1586 auth_len *= sizeof(struct sadb_alg);
1587 auth_len += sizeof(struct sadb_supported);
1588 }
1589
1590 enc_len = xfrm_count_pfkey_enc_supported();
1591 if (enc_len) {
1592 enc_len *= sizeof(struct sadb_alg);
1593 enc_len += sizeof(struct sadb_supported);
1594 }
1595
1596 len = enc_len + auth_len + sizeof(struct sadb_msg);
1597
1598 skb = alloc_skb(len + 16, allocation);
1599 if (!skb)
1600 goto out_put_algs;
1601
1602 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1603 pfkey_hdr_dup(hdr, orig);
1604 hdr->sadb_msg_errno = 0;
1605 hdr->sadb_msg_len = len / sizeof(uint64_t);
1606
1607 if (auth_len) {
1608 struct sadb_supported *sp;
1609 struct sadb_alg *ap;
1610
1611 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1612 ap = (struct sadb_alg *) (sp + 1);
1613
1614 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1615 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1616
1617 for (i = 0; ; i++) {
1618 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1619 if (!aalg)
1620 break;
1621 if (!aalg->pfkey_supported)
1622 continue;
1623 if (aalg->available)
1624 *ap++ = aalg->desc;
1625 }
1626 }
1627
1628 if (enc_len) {
1629 struct sadb_supported *sp;
1630 struct sadb_alg *ap;
1631
1632 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1633 ap = (struct sadb_alg *) (sp + 1);
1634
1635 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1636 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1637
1638 for (i = 0; ; i++) {
1639 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1640 if (!ealg)
1641 break;
1642 if (!ealg->pfkey_supported)
1643 continue;
1644 if (ealg->available)
1645 *ap++ = ealg->desc;
1646 }
1647 }
1648
1649 out_put_algs:
1650 return skb;
1651 }
1652
1653 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1654 {
1655 struct pfkey_sock *pfk = pfkey_sk(sk);
1656 struct sk_buff *supp_skb;
1657
1658 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1659 return -EINVAL;
1660
1661 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1662 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1663 return -EEXIST;
1664 pfk->registered |= (1<<hdr->sadb_msg_satype);
1665 }
1666
1667 xfrm_probe_algs();
1668
1669 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1670 if (!supp_skb) {
1671 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1672 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1673
1674 return -ENOBUFS;
1675 }
1676
1677 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1678
1679 return 0;
1680 }
1681
1682 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1683 {
1684 struct sk_buff *skb;
1685 struct sadb_msg *hdr;
1686
1687 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1688 if (!skb)
1689 return -ENOBUFS;
1690
1691 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1692 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1693 hdr->sadb_msg_errno = (uint8_t) 0;
1694 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1695
1696 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1697 }
1698
1699 static int key_notify_sa_flush(const struct km_event *c)
1700 {
1701 struct sk_buff *skb;
1702 struct sadb_msg *hdr;
1703
1704 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1705 if (!skb)
1706 return -ENOBUFS;
1707 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1708 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1709 hdr->sadb_msg_type = SADB_FLUSH;
1710 hdr->sadb_msg_seq = c->seq;
1711 hdr->sadb_msg_pid = c->portid;
1712 hdr->sadb_msg_version = PF_KEY_V2;
1713 hdr->sadb_msg_errno = (uint8_t) 0;
1714 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1715 hdr->sadb_msg_reserved = 0;
1716
1717 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1718
1719 return 0;
1720 }
1721
1722 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1723 {
1724 struct net *net = sock_net(sk);
1725 unsigned int proto;
1726 struct km_event c;
1727 struct xfrm_audit audit_info;
1728 int err, err2;
1729
1730 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1731 if (proto == 0)
1732 return -EINVAL;
1733
1734 audit_info.loginuid = audit_get_loginuid(current);
1735 audit_info.sessionid = audit_get_sessionid(current);
1736 audit_info.secid = 0;
1737 err = xfrm_state_flush(net, proto, &audit_info);
1738 err2 = unicast_flush_resp(sk, hdr);
1739 if (err || err2) {
1740 if (err == -ESRCH) /* empty table - go quietly */
1741 err = 0;
1742 return err ? err : err2;
1743 }
1744
1745 c.data.proto = proto;
1746 c.seq = hdr->sadb_msg_seq;
1747 c.portid = hdr->sadb_msg_pid;
1748 c.event = XFRM_MSG_FLUSHSA;
1749 c.net = net;
1750 km_state_notify(NULL, &c);
1751
1752 return 0;
1753 }
1754
1755 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1756 {
1757 struct pfkey_sock *pfk = ptr;
1758 struct sk_buff *out_skb;
1759 struct sadb_msg *out_hdr;
1760
1761 if (!pfkey_can_dump(&pfk->sk))
1762 return -ENOBUFS;
1763
1764 out_skb = pfkey_xfrm_state2msg(x);
1765 if (IS_ERR(out_skb))
1766 return PTR_ERR(out_skb);
1767
1768 out_hdr = (struct sadb_msg *) out_skb->data;
1769 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1770 out_hdr->sadb_msg_type = SADB_DUMP;
1771 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1772 out_hdr->sadb_msg_errno = 0;
1773 out_hdr->sadb_msg_reserved = 0;
1774 out_hdr->sadb_msg_seq = count + 1;
1775 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1776
1777 if (pfk->dump.skb)
1778 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1779 &pfk->sk, sock_net(&pfk->sk));
1780 pfk->dump.skb = out_skb;
1781
1782 return 0;
1783 }
1784
1785 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1786 {
1787 struct net *net = sock_net(&pfk->sk);
1788 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1789 }
1790
1791 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1792 {
1793 struct net *net = sock_net(&pfk->sk);
1794
1795 xfrm_state_walk_done(&pfk->dump.u.state, net);
1796 }
1797
1798 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1799 {
1800 u8 proto;
1801 struct pfkey_sock *pfk = pfkey_sk(sk);
1802
1803 if (pfk->dump.dump != NULL)
1804 return -EBUSY;
1805
1806 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1807 if (proto == 0)
1808 return -EINVAL;
1809
1810 pfk->dump.msg_version = hdr->sadb_msg_version;
1811 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1812 pfk->dump.dump = pfkey_dump_sa;
1813 pfk->dump.done = pfkey_dump_sa_done;
1814 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1815
1816 return pfkey_do_dump(pfk);
1817 }
1818
1819 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1820 {
1821 struct pfkey_sock *pfk = pfkey_sk(sk);
1822 int satype = hdr->sadb_msg_satype;
1823 bool reset_errno = false;
1824
1825 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1826 reset_errno = true;
1827 if (satype != 0 && satype != 1)
1828 return -EINVAL;
1829 pfk->promisc = satype;
1830 }
1831 if (reset_errno && skb_cloned(skb))
1832 skb = skb_copy(skb, GFP_KERNEL);
1833 else
1834 skb = skb_clone(skb, GFP_KERNEL);
1835
1836 if (reset_errno && skb) {
1837 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1838 new_hdr->sadb_msg_errno = 0;
1839 }
1840
1841 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1842 return 0;
1843 }
1844
1845 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1846 {
1847 int i;
1848 u32 reqid = *(u32*)ptr;
1849
1850 for (i=0; i<xp->xfrm_nr; i++) {
1851 if (xp->xfrm_vec[i].reqid == reqid)
1852 return -EEXIST;
1853 }
1854 return 0;
1855 }
1856
1857 static u32 gen_reqid(struct net *net)
1858 {
1859 struct xfrm_policy_walk walk;
1860 u32 start;
1861 int rc;
1862 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1863
1864 start = reqid;
1865 do {
1866 ++reqid;
1867 if (reqid == 0)
1868 reqid = IPSEC_MANUAL_REQID_MAX+1;
1869 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1870 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1871 xfrm_policy_walk_done(&walk, net);
1872 if (rc != -EEXIST)
1873 return reqid;
1874 } while (reqid != start);
1875 return 0;
1876 }
1877
1878 static int
1879 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1880 {
1881 struct net *net = xp_net(xp);
1882 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1883 int mode;
1884
1885 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1886 return -ELOOP;
1887
1888 if (rq->sadb_x_ipsecrequest_mode == 0)
1889 return -EINVAL;
1890
1891 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1892 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1893 return -EINVAL;
1894 t->mode = mode;
1895 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1896 t->optional = 1;
1897 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1898 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1899 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1900 t->reqid = 0;
1901 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1902 return -ENOBUFS;
1903 }
1904
1905 /* addresses present only in tunnel mode */
1906 if (t->mode == XFRM_MODE_TUNNEL) {
1907 u8 *sa = (u8 *) (rq + 1);
1908 int family, socklen;
1909
1910 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1911 &t->saddr);
1912 if (!family)
1913 return -EINVAL;
1914
1915 socklen = pfkey_sockaddr_len(family);
1916 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1917 &t->id.daddr) != family)
1918 return -EINVAL;
1919 t->encap_family = family;
1920 } else
1921 t->encap_family = xp->family;
1922
1923 /* No way to set this via kame pfkey */
1924 t->allalgs = 1;
1925 xp->xfrm_nr++;
1926 return 0;
1927 }
1928
1929 static int
1930 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1931 {
1932 int err;
1933 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1934 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1935
1936 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1937 return -EINVAL;
1938
1939 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1940 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1941 return err;
1942 len -= rq->sadb_x_ipsecrequest_len;
1943 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1944 }
1945 return 0;
1946 }
1947
1948 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1949 {
1950 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1951
1952 if (xfrm_ctx) {
1953 int len = sizeof(struct sadb_x_sec_ctx);
1954 len += xfrm_ctx->ctx_len;
1955 return PFKEY_ALIGN8(len);
1956 }
1957 return 0;
1958 }
1959
1960 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1961 {
1962 const struct xfrm_tmpl *t;
1963 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1964 int socklen = 0;
1965 int i;
1966
1967 for (i=0; i<xp->xfrm_nr; i++) {
1968 t = xp->xfrm_vec + i;
1969 socklen += pfkey_sockaddr_len(t->encap_family);
1970 }
1971
1972 return sizeof(struct sadb_msg) +
1973 (sizeof(struct sadb_lifetime) * 3) +
1974 (sizeof(struct sadb_address) * 2) +
1975 (sockaddr_size * 2) +
1976 sizeof(struct sadb_x_policy) +
1977 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1978 (socklen * 2) +
1979 pfkey_xfrm_policy2sec_ctx_size(xp);
1980 }
1981
1982 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1983 {
1984 struct sk_buff *skb;
1985 int size;
1986
1987 size = pfkey_xfrm_policy2msg_size(xp);
1988
1989 skb = alloc_skb(size + 16, GFP_ATOMIC);
1990 if (skb == NULL)
1991 return ERR_PTR(-ENOBUFS);
1992
1993 return skb;
1994 }
1995
1996 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1997 {
1998 struct sadb_msg *hdr;
1999 struct sadb_address *addr;
2000 struct sadb_lifetime *lifetime;
2001 struct sadb_x_policy *pol;
2002 struct sadb_x_sec_ctx *sec_ctx;
2003 struct xfrm_sec_ctx *xfrm_ctx;
2004 int i;
2005 int size;
2006 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2007 int socklen = pfkey_sockaddr_len(xp->family);
2008
2009 size = pfkey_xfrm_policy2msg_size(xp);
2010
2011 /* call should fill header later */
2012 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2013 memset(hdr, 0, size); /* XXX do we need this ? */
2014
2015 /* src address */
2016 addr = (struct sadb_address*) skb_put(skb,
2017 sizeof(struct sadb_address)+sockaddr_size);
2018 addr->sadb_address_len =
2019 (sizeof(struct sadb_address)+sockaddr_size)/
2020 sizeof(uint64_t);
2021 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2022 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2023 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2024 addr->sadb_address_reserved = 0;
2025 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2026 xp->selector.sport,
2027 (struct sockaddr *) (addr + 1),
2028 xp->family))
2029 BUG();
2030
2031 /* dst address */
2032 addr = (struct sadb_address*) skb_put(skb,
2033 sizeof(struct sadb_address)+sockaddr_size);
2034 addr->sadb_address_len =
2035 (sizeof(struct sadb_address)+sockaddr_size)/
2036 sizeof(uint64_t);
2037 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2038 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2039 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2040 addr->sadb_address_reserved = 0;
2041
2042 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2043 (struct sockaddr *) (addr + 1),
2044 xp->family);
2045
2046 /* hard time */
2047 lifetime = (struct sadb_lifetime *) skb_put(skb,
2048 sizeof(struct sadb_lifetime));
2049 lifetime->sadb_lifetime_len =
2050 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2051 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2052 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2053 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2054 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2055 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2056 /* soft time */
2057 lifetime = (struct sadb_lifetime *) skb_put(skb,
2058 sizeof(struct sadb_lifetime));
2059 lifetime->sadb_lifetime_len =
2060 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2061 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2062 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2063 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2064 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2065 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2066 /* current time */
2067 lifetime = (struct sadb_lifetime *) skb_put(skb,
2068 sizeof(struct sadb_lifetime));
2069 lifetime->sadb_lifetime_len =
2070 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2071 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2072 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2073 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2074 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2075 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2076
2077 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2078 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2079 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2080 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2081 if (xp->action == XFRM_POLICY_ALLOW) {
2082 if (xp->xfrm_nr)
2083 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2084 else
2085 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2086 }
2087 pol->sadb_x_policy_dir = dir+1;
2088 pol->sadb_x_policy_reserved = 0;
2089 pol->sadb_x_policy_id = xp->index;
2090 pol->sadb_x_policy_priority = xp->priority;
2091
2092 for (i=0; i<xp->xfrm_nr; i++) {
2093 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2094 struct sadb_x_ipsecrequest *rq;
2095 int req_size;
2096 int mode;
2097
2098 req_size = sizeof(struct sadb_x_ipsecrequest);
2099 if (t->mode == XFRM_MODE_TUNNEL) {
2100 socklen = pfkey_sockaddr_len(t->encap_family);
2101 req_size += socklen * 2;
2102 } else {
2103 size -= 2*socklen;
2104 }
2105 rq = (void*)skb_put(skb, req_size);
2106 pol->sadb_x_policy_len += req_size/8;
2107 memset(rq, 0, sizeof(*rq));
2108 rq->sadb_x_ipsecrequest_len = req_size;
2109 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2110 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2111 return -EINVAL;
2112 rq->sadb_x_ipsecrequest_mode = mode;
2113 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2114 if (t->reqid)
2115 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2116 if (t->optional)
2117 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2118 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2119
2120 if (t->mode == XFRM_MODE_TUNNEL) {
2121 u8 *sa = (void *)(rq + 1);
2122 pfkey_sockaddr_fill(&t->saddr, 0,
2123 (struct sockaddr *)sa,
2124 t->encap_family);
2125 pfkey_sockaddr_fill(&t->id.daddr, 0,
2126 (struct sockaddr *) (sa + socklen),
2127 t->encap_family);
2128 }
2129 }
2130
2131 /* security context */
2132 if ((xfrm_ctx = xp->security)) {
2133 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2134
2135 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2136 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2137 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2138 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2139 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2140 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2141 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2142 xfrm_ctx->ctx_len);
2143 }
2144
2145 hdr->sadb_msg_len = size / sizeof(uint64_t);
2146 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2147
2148 return 0;
2149 }
2150
2151 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2152 {
2153 struct sk_buff *out_skb;
2154 struct sadb_msg *out_hdr;
2155 int err;
2156
2157 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2158 if (IS_ERR(out_skb))
2159 return PTR_ERR(out_skb);
2160
2161 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2162 if (err < 0)
2163 return err;
2164
2165 out_hdr = (struct sadb_msg *) out_skb->data;
2166 out_hdr->sadb_msg_version = PF_KEY_V2;
2167
2168 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2169 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2170 else
2171 out_hdr->sadb_msg_type = event2poltype(c->event);
2172 out_hdr->sadb_msg_errno = 0;
2173 out_hdr->sadb_msg_seq = c->seq;
2174 out_hdr->sadb_msg_pid = c->portid;
2175 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2176 return 0;
2177
2178 }
2179
2180 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2181 {
2182 struct net *net = sock_net(sk);
2183 int err = 0;
2184 struct sadb_lifetime *lifetime;
2185 struct sadb_address *sa;
2186 struct sadb_x_policy *pol;
2187 struct xfrm_policy *xp;
2188 struct km_event c;
2189 struct sadb_x_sec_ctx *sec_ctx;
2190
2191 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2192 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2193 !ext_hdrs[SADB_X_EXT_POLICY-1])
2194 return -EINVAL;
2195
2196 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2197 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2198 return -EINVAL;
2199 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2200 return -EINVAL;
2201
2202 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2203 if (xp == NULL)
2204 return -ENOBUFS;
2205
2206 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2207 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2208 xp->priority = pol->sadb_x_policy_priority;
2209
2210 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2211 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2212 xp->selector.family = xp->family;
2213 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2214 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2215 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2216 if (xp->selector.sport)
2217 xp->selector.sport_mask = htons(0xffff);
2218
2219 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2220 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2221 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2222
2223 /* Amusing, we set this twice. KAME apps appear to set same value
2224 * in both addresses.
2225 */
2226 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2227
2228 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2229 if (xp->selector.dport)
2230 xp->selector.dport_mask = htons(0xffff);
2231
2232 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2233 if (sec_ctx != NULL) {
2234 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2235
2236 if (!uctx) {
2237 err = -ENOBUFS;
2238 goto out;
2239 }
2240
2241 err = security_xfrm_policy_alloc(&xp->security, uctx);
2242 kfree(uctx);
2243
2244 if (err)
2245 goto out;
2246 }
2247
2248 xp->lft.soft_byte_limit = XFRM_INF;
2249 xp->lft.hard_byte_limit = XFRM_INF;
2250 xp->lft.soft_packet_limit = XFRM_INF;
2251 xp->lft.hard_packet_limit = XFRM_INF;
2252 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2253 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2254 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2255 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2256 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2257 }
2258 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2259 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2260 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2261 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2262 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2263 }
2264 xp->xfrm_nr = 0;
2265 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2266 (err = parse_ipsecrequests(xp, pol)) < 0)
2267 goto out;
2268
2269 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2270 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2271
2272 xfrm_audit_policy_add(xp, err ? 0 : 1,
2273 audit_get_loginuid(current),
2274 audit_get_sessionid(current), 0);
2275
2276 if (err)
2277 goto out;
2278
2279 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2280 c.event = XFRM_MSG_UPDPOLICY;
2281 else
2282 c.event = XFRM_MSG_NEWPOLICY;
2283
2284 c.seq = hdr->sadb_msg_seq;
2285 c.portid = hdr->sadb_msg_pid;
2286
2287 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2288 xfrm_pol_put(xp);
2289 return 0;
2290
2291 out:
2292 xp->walk.dead = 1;
2293 xfrm_policy_destroy(xp);
2294 return err;
2295 }
2296
2297 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2298 {
2299 struct net *net = sock_net(sk);
2300 int err;
2301 struct sadb_address *sa;
2302 struct sadb_x_policy *pol;
2303 struct xfrm_policy *xp;
2304 struct xfrm_selector sel;
2305 struct km_event c;
2306 struct sadb_x_sec_ctx *sec_ctx;
2307 struct xfrm_sec_ctx *pol_ctx = NULL;
2308
2309 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2310 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2311 !ext_hdrs[SADB_X_EXT_POLICY-1])
2312 return -EINVAL;
2313
2314 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2315 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2316 return -EINVAL;
2317
2318 memset(&sel, 0, sizeof(sel));
2319
2320 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2321 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2322 sel.prefixlen_s = sa->sadb_address_prefixlen;
2323 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2324 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2325 if (sel.sport)
2326 sel.sport_mask = htons(0xffff);
2327
2328 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2329 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2330 sel.prefixlen_d = sa->sadb_address_prefixlen;
2331 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2332 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2333 if (sel.dport)
2334 sel.dport_mask = htons(0xffff);
2335
2336 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2337 if (sec_ctx != NULL) {
2338 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2339
2340 if (!uctx)
2341 return -ENOMEM;
2342
2343 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2344 kfree(uctx);
2345 if (err)
2346 return err;
2347 }
2348
2349 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2350 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2351 1, &err);
2352 security_xfrm_policy_free(pol_ctx);
2353 if (xp == NULL)
2354 return -ENOENT;
2355
2356 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2357 audit_get_loginuid(current),
2358 audit_get_sessionid(current), 0);
2359
2360 if (err)
2361 goto out;
2362
2363 c.seq = hdr->sadb_msg_seq;
2364 c.portid = hdr->sadb_msg_pid;
2365 c.data.byid = 0;
2366 c.event = XFRM_MSG_DELPOLICY;
2367 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2368
2369 out:
2370 xfrm_pol_put(xp);
2371 if (err == 0)
2372 xfrm_garbage_collect(net);
2373 return err;
2374 }
2375
2376 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2377 {
2378 int err;
2379 struct sk_buff *out_skb;
2380 struct sadb_msg *out_hdr;
2381 err = 0;
2382
2383 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2384 if (IS_ERR(out_skb)) {
2385 err = PTR_ERR(out_skb);
2386 goto out;
2387 }
2388 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2389 if (err < 0)
2390 goto out;
2391
2392 out_hdr = (struct sadb_msg *) out_skb->data;
2393 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2394 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2395 out_hdr->sadb_msg_satype = 0;
2396 out_hdr->sadb_msg_errno = 0;
2397 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2398 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2399 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2400 err = 0;
2401
2402 out:
2403 return err;
2404 }
2405
2406 #ifdef CONFIG_NET_KEY_MIGRATE
2407 static int pfkey_sockaddr_pair_size(sa_family_t family)
2408 {
2409 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2410 }
2411
2412 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2413 xfrm_address_t *saddr, xfrm_address_t *daddr,
2414 u16 *family)
2415 {
2416 int af, socklen;
2417
2418 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2419 return -EINVAL;
2420
2421 af = pfkey_sockaddr_extract(sa, saddr);
2422 if (!af)
2423 return -EINVAL;
2424
2425 socklen = pfkey_sockaddr_len(af);
2426 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2427 daddr) != af)
2428 return -EINVAL;
2429
2430 *family = af;
2431 return 0;
2432 }
2433
2434 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2435 struct xfrm_migrate *m)
2436 {
2437 int err;
2438 struct sadb_x_ipsecrequest *rq2;
2439 int mode;
2440
2441 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2442 len < rq1->sadb_x_ipsecrequest_len)
2443 return -EINVAL;
2444
2445 /* old endoints */
2446 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2447 rq1->sadb_x_ipsecrequest_len,
2448 &m->old_saddr, &m->old_daddr,
2449 &m->old_family);
2450 if (err)
2451 return err;
2452
2453 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2454 len -= rq1->sadb_x_ipsecrequest_len;
2455
2456 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2457 len < rq2->sadb_x_ipsecrequest_len)
2458 return -EINVAL;
2459
2460 /* new endpoints */
2461 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2462 rq2->sadb_x_ipsecrequest_len,
2463 &m->new_saddr, &m->new_daddr,
2464 &m->new_family);
2465 if (err)
2466 return err;
2467
2468 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2469 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2470 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2471 return -EINVAL;
2472
2473 m->proto = rq1->sadb_x_ipsecrequest_proto;
2474 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2475 return -EINVAL;
2476 m->mode = mode;
2477 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2478
2479 return ((int)(rq1->sadb_x_ipsecrequest_len +
2480 rq2->sadb_x_ipsecrequest_len));
2481 }
2482
2483 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2484 const struct sadb_msg *hdr, void * const *ext_hdrs)
2485 {
2486 int i, len, ret, err = -EINVAL;
2487 u8 dir;
2488 struct sadb_address *sa;
2489 struct sadb_x_kmaddress *kma;
2490 struct sadb_x_policy *pol;
2491 struct sadb_x_ipsecrequest *rq;
2492 struct xfrm_selector sel;
2493 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2494 struct xfrm_kmaddress k;
2495 struct net *net = sock_net(sk);
2496
2497 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2498 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2499 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2500 err = -EINVAL;
2501 goto out;
2502 }
2503
2504 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2505 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2506
2507 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2508 err = -EINVAL;
2509 goto out;
2510 }
2511
2512 if (kma) {
2513 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2514 k.reserved = kma->sadb_x_kmaddress_reserved;
2515 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2516 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2517 &k.local, &k.remote, &k.family);
2518 if (ret < 0) {
2519 err = ret;
2520 goto out;
2521 }
2522 }
2523
2524 dir = pol->sadb_x_policy_dir - 1;
2525 memset(&sel, 0, sizeof(sel));
2526
2527 /* set source address info of selector */
2528 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2529 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2530 sel.prefixlen_s = sa->sadb_address_prefixlen;
2531 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2532 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2533 if (sel.sport)
2534 sel.sport_mask = htons(0xffff);
2535
2536 /* set destination address info of selector */
2537 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2538 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2539 sel.prefixlen_d = sa->sadb_address_prefixlen;
2540 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2541 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2542 if (sel.dport)
2543 sel.dport_mask = htons(0xffff);
2544
2545 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2546
2547 /* extract ipsecrequests */
2548 i = 0;
2549 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2550
2551 while (len > 0 && i < XFRM_MAX_DEPTH) {
2552 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2553 if (ret < 0) {
2554 err = ret;
2555 goto out;
2556 } else {
2557 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2558 len -= ret;
2559 i++;
2560 }
2561 }
2562
2563 if (!i || len > 0) {
2564 err = -EINVAL;
2565 goto out;
2566 }
2567
2568 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2569 kma ? &k : NULL, net);
2570
2571 out:
2572 return err;
2573 }
2574 #else
2575 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2576 const struct sadb_msg *hdr, void * const *ext_hdrs)
2577 {
2578 return -ENOPROTOOPT;
2579 }
2580 #endif
2581
2582
2583 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2584 {
2585 struct net *net = sock_net(sk);
2586 unsigned int dir;
2587 int err = 0, delete;
2588 struct sadb_x_policy *pol;
2589 struct xfrm_policy *xp;
2590 struct km_event c;
2591
2592 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2593 return -EINVAL;
2594
2595 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2596 if (dir >= XFRM_POLICY_MAX)
2597 return -EINVAL;
2598
2599 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2600 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2601 dir, pol->sadb_x_policy_id, delete, &err);
2602 if (xp == NULL)
2603 return -ENOENT;
2604
2605 if (delete) {
2606 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2607 audit_get_loginuid(current),
2608 audit_get_sessionid(current), 0);
2609
2610 if (err)
2611 goto out;
2612 c.seq = hdr->sadb_msg_seq;
2613 c.portid = hdr->sadb_msg_pid;
2614 c.data.byid = 1;
2615 c.event = XFRM_MSG_DELPOLICY;
2616 km_policy_notify(xp, dir, &c);
2617 } else {
2618 err = key_pol_get_resp(sk, xp, hdr, dir);
2619 }
2620
2621 out:
2622 xfrm_pol_put(xp);
2623 if (delete && err == 0)
2624 xfrm_garbage_collect(net);
2625 return err;
2626 }
2627
2628 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2629 {
2630 struct pfkey_sock *pfk = ptr;
2631 struct sk_buff *out_skb;
2632 struct sadb_msg *out_hdr;
2633 int err;
2634
2635 if (!pfkey_can_dump(&pfk->sk))
2636 return -ENOBUFS;
2637
2638 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2639 if (IS_ERR(out_skb))
2640 return PTR_ERR(out_skb);
2641
2642 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2643 if (err < 0)
2644 return err;
2645
2646 out_hdr = (struct sadb_msg *) out_skb->data;
2647 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2648 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2649 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2650 out_hdr->sadb_msg_errno = 0;
2651 out_hdr->sadb_msg_seq = count + 1;
2652 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2653
2654 if (pfk->dump.skb)
2655 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2656 &pfk->sk, sock_net(&pfk->sk));
2657 pfk->dump.skb = out_skb;
2658
2659 return 0;
2660 }
2661
2662 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2663 {
2664 struct net *net = sock_net(&pfk->sk);
2665 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2666 }
2667
2668 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2669 {
2670 struct net *net = sock_net((struct sock *)pfk);
2671
2672 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2673 }
2674
2675 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2676 {
2677 struct pfkey_sock *pfk = pfkey_sk(sk);
2678
2679 if (pfk->dump.dump != NULL)
2680 return -EBUSY;
2681
2682 pfk->dump.msg_version = hdr->sadb_msg_version;
2683 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2684 pfk->dump.dump = pfkey_dump_sp;
2685 pfk->dump.done = pfkey_dump_sp_done;
2686 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2687
2688 return pfkey_do_dump(pfk);
2689 }
2690
2691 static int key_notify_policy_flush(const struct km_event *c)
2692 {
2693 struct sk_buff *skb_out;
2694 struct sadb_msg *hdr;
2695
2696 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2697 if (!skb_out)
2698 return -ENOBUFS;
2699 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2700 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2701 hdr->sadb_msg_seq = c->seq;
2702 hdr->sadb_msg_pid = c->portid;
2703 hdr->sadb_msg_version = PF_KEY_V2;
2704 hdr->sadb_msg_errno = (uint8_t) 0;
2705 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2706 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2707 hdr->sadb_msg_reserved = 0;
2708 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2709 return 0;
2710
2711 }
2712
2713 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2714 {
2715 struct net *net = sock_net(sk);
2716 struct km_event c;
2717 struct xfrm_audit audit_info;
2718 int err, err2;
2719
2720 audit_info.loginuid = audit_get_loginuid(current);
2721 audit_info.sessionid = audit_get_sessionid(current);
2722 audit_info.secid = 0;
2723 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2724 err2 = unicast_flush_resp(sk, hdr);
2725 if (err || err2) {
2726 if (err == -ESRCH) /* empty table - old silent behavior */
2727 return 0;
2728 return err;
2729 }
2730
2731 c.data.type = XFRM_POLICY_TYPE_MAIN;
2732 c.event = XFRM_MSG_FLUSHPOLICY;
2733 c.portid = hdr->sadb_msg_pid;
2734 c.seq = hdr->sadb_msg_seq;
2735 c.net = net;
2736 km_policy_notify(NULL, 0, &c);
2737
2738 return 0;
2739 }
2740
2741 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2742 const struct sadb_msg *hdr, void * const *ext_hdrs);
2743 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2744 [SADB_RESERVED] = pfkey_reserved,
2745 [SADB_GETSPI] = pfkey_getspi,
2746 [SADB_UPDATE] = pfkey_add,
2747 [SADB_ADD] = pfkey_add,
2748 [SADB_DELETE] = pfkey_delete,
2749 [SADB_GET] = pfkey_get,
2750 [SADB_ACQUIRE] = pfkey_acquire,
2751 [SADB_REGISTER] = pfkey_register,
2752 [SADB_EXPIRE] = NULL,
2753 [SADB_FLUSH] = pfkey_flush,
2754 [SADB_DUMP] = pfkey_dump,
2755 [SADB_X_PROMISC] = pfkey_promisc,
2756 [SADB_X_PCHANGE] = NULL,
2757 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2758 [SADB_X_SPDADD] = pfkey_spdadd,
2759 [SADB_X_SPDDELETE] = pfkey_spddelete,
2760 [SADB_X_SPDGET] = pfkey_spdget,
2761 [SADB_X_SPDACQUIRE] = NULL,
2762 [SADB_X_SPDDUMP] = pfkey_spddump,
2763 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2764 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2765 [SADB_X_SPDDELETE2] = pfkey_spdget,
2766 [SADB_X_MIGRATE] = pfkey_migrate,
2767 };
2768
2769 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2770 {
2771 void *ext_hdrs[SADB_EXT_MAX];
2772 int err;
2773
2774 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2775 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2776
2777 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2778 err = parse_exthdrs(skb, hdr, ext_hdrs);
2779 if (!err) {
2780 err = -EOPNOTSUPP;
2781 if (pfkey_funcs[hdr->sadb_msg_type])
2782 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2783 }
2784 return err;
2785 }
2786
2787 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2788 {
2789 struct sadb_msg *hdr = NULL;
2790
2791 if (skb->len < sizeof(*hdr)) {
2792 *errp = -EMSGSIZE;
2793 } else {
2794 hdr = (struct sadb_msg *) skb->data;
2795 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2796 hdr->sadb_msg_reserved != 0 ||
2797 (hdr->sadb_msg_type <= SADB_RESERVED ||
2798 hdr->sadb_msg_type > SADB_MAX)) {
2799 hdr = NULL;
2800 *errp = -EINVAL;
2801 } else if (hdr->sadb_msg_len != (skb->len /
2802 sizeof(uint64_t)) ||
2803 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2804 sizeof(uint64_t))) {
2805 hdr = NULL;
2806 *errp = -EMSGSIZE;
2807 } else {
2808 *errp = 0;
2809 }
2810 }
2811 return hdr;
2812 }
2813
2814 static inline int aalg_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->aalgos) * 8)
2820 return 0;
2821
2822 return (t->aalgos >> id) & 1;
2823 }
2824
2825 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2826 const struct xfrm_algo_desc *d)
2827 {
2828 unsigned int id = d->desc.sadb_alg_id;
2829
2830 if (id >= sizeof(t->ealgos) * 8)
2831 return 0;
2832
2833 return (t->ealgos >> id) & 1;
2834 }
2835
2836 static int count_ah_combs(const struct xfrm_tmpl *t)
2837 {
2838 int i, sz = 0;
2839
2840 for (i = 0; ; i++) {
2841 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2842 if (!aalg)
2843 break;
2844 if (!aalg->pfkey_supported)
2845 continue;
2846 if (aalg_tmpl_set(t, aalg) && aalg->available)
2847 sz += sizeof(struct sadb_comb);
2848 }
2849 return sz + sizeof(struct sadb_prop);
2850 }
2851
2852 static int count_esp_combs(const struct xfrm_tmpl *t)
2853 {
2854 int i, k, sz = 0;
2855
2856 for (i = 0; ; i++) {
2857 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2858 if (!ealg)
2859 break;
2860
2861 if (!ealg->pfkey_supported)
2862 continue;
2863
2864 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2865 continue;
2866
2867 for (k = 1; ; k++) {
2868 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2869 if (!aalg)
2870 break;
2871
2872 if (!aalg->pfkey_supported)
2873 continue;
2874
2875 if (aalg_tmpl_set(t, aalg) && aalg->available)
2876 sz += sizeof(struct sadb_comb);
2877 }
2878 }
2879 return sz + sizeof(struct sadb_prop);
2880 }
2881
2882 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2883 {
2884 struct sadb_prop *p;
2885 int i;
2886
2887 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2888 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2889 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2890 p->sadb_prop_replay = 32;
2891 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2892
2893 for (i = 0; ; i++) {
2894 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2895 if (!aalg)
2896 break;
2897
2898 if (!aalg->pfkey_supported)
2899 continue;
2900
2901 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2902 struct sadb_comb *c;
2903 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2904 memset(c, 0, sizeof(*c));
2905 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2906 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2907 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2908 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2909 c->sadb_comb_hard_addtime = 24*60*60;
2910 c->sadb_comb_soft_addtime = 20*60*60;
2911 c->sadb_comb_hard_usetime = 8*60*60;
2912 c->sadb_comb_soft_usetime = 7*60*60;
2913 }
2914 }
2915 }
2916
2917 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2918 {
2919 struct sadb_prop *p;
2920 int i, k;
2921
2922 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2923 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2924 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2925 p->sadb_prop_replay = 32;
2926 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2927
2928 for (i=0; ; i++) {
2929 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2930 if (!ealg)
2931 break;
2932
2933 if (!ealg->pfkey_supported)
2934 continue;
2935
2936 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2937 continue;
2938
2939 for (k = 1; ; k++) {
2940 struct sadb_comb *c;
2941 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2942 if (!aalg)
2943 break;
2944 if (!aalg->pfkey_supported)
2945 continue;
2946 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2947 continue;
2948 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2949 memset(c, 0, sizeof(*c));
2950 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2951 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2952 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2953 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2954 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2955 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2956 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2957 c->sadb_comb_hard_addtime = 24*60*60;
2958 c->sadb_comb_soft_addtime = 20*60*60;
2959 c->sadb_comb_hard_usetime = 8*60*60;
2960 c->sadb_comb_soft_usetime = 7*60*60;
2961 }
2962 }
2963 }
2964
2965 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2966 {
2967 return 0;
2968 }
2969
2970 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2971 {
2972 struct sk_buff *out_skb;
2973 struct sadb_msg *out_hdr;
2974 int hard;
2975 int hsc;
2976
2977 hard = c->data.hard;
2978 if (hard)
2979 hsc = 2;
2980 else
2981 hsc = 1;
2982
2983 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2984 if (IS_ERR(out_skb))
2985 return PTR_ERR(out_skb);
2986
2987 out_hdr = (struct sadb_msg *) out_skb->data;
2988 out_hdr->sadb_msg_version = PF_KEY_V2;
2989 out_hdr->sadb_msg_type = SADB_EXPIRE;
2990 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2991 out_hdr->sadb_msg_errno = 0;
2992 out_hdr->sadb_msg_reserved = 0;
2993 out_hdr->sadb_msg_seq = 0;
2994 out_hdr->sadb_msg_pid = 0;
2995
2996 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2997 return 0;
2998 }
2999
3000 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3001 {
3002 struct net *net = x ? xs_net(x) : c->net;
3003 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3004
3005 if (atomic_read(&net_pfkey->socks_nr) == 0)
3006 return 0;
3007
3008 switch (c->event) {
3009 case XFRM_MSG_EXPIRE:
3010 return key_notify_sa_expire(x, c);
3011 case XFRM_MSG_DELSA:
3012 case XFRM_MSG_NEWSA:
3013 case XFRM_MSG_UPDSA:
3014 return key_notify_sa(x, c);
3015 case XFRM_MSG_FLUSHSA:
3016 return key_notify_sa_flush(c);
3017 case XFRM_MSG_NEWAE: /* not yet supported */
3018 break;
3019 default:
3020 pr_err("pfkey: Unknown SA event %d\n", c->event);
3021 break;
3022 }
3023
3024 return 0;
3025 }
3026
3027 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3028 {
3029 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3030 return 0;
3031
3032 switch (c->event) {
3033 case XFRM_MSG_POLEXPIRE:
3034 return key_notify_policy_expire(xp, c);
3035 case XFRM_MSG_DELPOLICY:
3036 case XFRM_MSG_NEWPOLICY:
3037 case XFRM_MSG_UPDPOLICY:
3038 return key_notify_policy(xp, dir, c);
3039 case XFRM_MSG_FLUSHPOLICY:
3040 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3041 break;
3042 return key_notify_policy_flush(c);
3043 default:
3044 pr_err("pfkey: Unknown policy event %d\n", c->event);
3045 break;
3046 }
3047
3048 return 0;
3049 }
3050
3051 static u32 get_acqseq(void)
3052 {
3053 u32 res;
3054 static atomic_t acqseq;
3055
3056 do {
3057 res = atomic_inc_return(&acqseq);
3058 } while (!res);
3059 return res;
3060 }
3061
3062 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3063 {
3064 struct sk_buff *skb;
3065 struct sadb_msg *hdr;
3066 struct sadb_address *addr;
3067 struct sadb_x_policy *pol;
3068 int sockaddr_size;
3069 int size;
3070 struct sadb_x_sec_ctx *sec_ctx;
3071 struct xfrm_sec_ctx *xfrm_ctx;
3072 int ctx_size = 0;
3073
3074 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3075 if (!sockaddr_size)
3076 return -EINVAL;
3077
3078 size = sizeof(struct sadb_msg) +
3079 (sizeof(struct sadb_address) * 2) +
3080 (sockaddr_size * 2) +
3081 sizeof(struct sadb_x_policy);
3082
3083 if (x->id.proto == IPPROTO_AH)
3084 size += count_ah_combs(t);
3085 else if (x->id.proto == IPPROTO_ESP)
3086 size += count_esp_combs(t);
3087
3088 if ((xfrm_ctx = x->security)) {
3089 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3090 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3091 }
3092
3093 skb = alloc_skb(size + 16, GFP_ATOMIC);
3094 if (skb == NULL)
3095 return -ENOMEM;
3096
3097 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3098 hdr->sadb_msg_version = PF_KEY_V2;
3099 hdr->sadb_msg_type = SADB_ACQUIRE;
3100 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3101 hdr->sadb_msg_len = size / sizeof(uint64_t);
3102 hdr->sadb_msg_errno = 0;
3103 hdr->sadb_msg_reserved = 0;
3104 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3105 hdr->sadb_msg_pid = 0;
3106
3107 /* src address */
3108 addr = (struct sadb_address*) skb_put(skb,
3109 sizeof(struct sadb_address)+sockaddr_size);
3110 addr->sadb_address_len =
3111 (sizeof(struct sadb_address)+sockaddr_size)/
3112 sizeof(uint64_t);
3113 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3114 addr->sadb_address_proto = 0;
3115 addr->sadb_address_reserved = 0;
3116 addr->sadb_address_prefixlen =
3117 pfkey_sockaddr_fill(&x->props.saddr, 0,
3118 (struct sockaddr *) (addr + 1),
3119 x->props.family);
3120 if (!addr->sadb_address_prefixlen)
3121 BUG();
3122
3123 /* dst address */
3124 addr = (struct sadb_address*) skb_put(skb,
3125 sizeof(struct sadb_address)+sockaddr_size);
3126 addr->sadb_address_len =
3127 (sizeof(struct sadb_address)+sockaddr_size)/
3128 sizeof(uint64_t);
3129 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3130 addr->sadb_address_proto = 0;
3131 addr->sadb_address_reserved = 0;
3132 addr->sadb_address_prefixlen =
3133 pfkey_sockaddr_fill(&x->id.daddr, 0,
3134 (struct sockaddr *) (addr + 1),
3135 x->props.family);
3136 if (!addr->sadb_address_prefixlen)
3137 BUG();
3138
3139 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3140 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3141 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3142 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3143 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3144 pol->sadb_x_policy_reserved = 0;
3145 pol->sadb_x_policy_id = xp->index;
3146 pol->sadb_x_policy_priority = xp->priority;
3147
3148 /* Set sadb_comb's. */
3149 if (x->id.proto == IPPROTO_AH)
3150 dump_ah_combs(skb, t);
3151 else if (x->id.proto == IPPROTO_ESP)
3152 dump_esp_combs(skb, t);
3153
3154 /* security context */
3155 if (xfrm_ctx) {
3156 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3157 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3158 sec_ctx->sadb_x_sec_len =
3159 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3160 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3161 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3162 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3163 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3164 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3165 xfrm_ctx->ctx_len);
3166 }
3167
3168 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3169 }
3170
3171 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3172 u8 *data, int len, int *dir)
3173 {
3174 struct net *net = sock_net(sk);
3175 struct xfrm_policy *xp;
3176 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3177 struct sadb_x_sec_ctx *sec_ctx;
3178
3179 switch (sk->sk_family) {
3180 case AF_INET:
3181 if (opt != IP_IPSEC_POLICY) {
3182 *dir = -EOPNOTSUPP;
3183 return NULL;
3184 }
3185 break;
3186 #if IS_ENABLED(CONFIG_IPV6)
3187 case AF_INET6:
3188 if (opt != IPV6_IPSEC_POLICY) {
3189 *dir = -EOPNOTSUPP;
3190 return NULL;
3191 }
3192 break;
3193 #endif
3194 default:
3195 *dir = -EINVAL;
3196 return NULL;
3197 }
3198
3199 *dir = -EINVAL;
3200
3201 if (len < sizeof(struct sadb_x_policy) ||
3202 pol->sadb_x_policy_len*8 > len ||
3203 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3204 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3205 return NULL;
3206
3207 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3208 if (xp == NULL) {
3209 *dir = -ENOBUFS;
3210 return NULL;
3211 }
3212
3213 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3214 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3215
3216 xp->lft.soft_byte_limit = XFRM_INF;
3217 xp->lft.hard_byte_limit = XFRM_INF;
3218 xp->lft.soft_packet_limit = XFRM_INF;
3219 xp->lft.hard_packet_limit = XFRM_INF;
3220 xp->family = sk->sk_family;
3221
3222 xp->xfrm_nr = 0;
3223 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3224 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3225 goto out;
3226
3227 /* security context too */
3228 if (len >= (pol->sadb_x_policy_len*8 +
3229 sizeof(struct sadb_x_sec_ctx))) {
3230 char *p = (char *)pol;
3231 struct xfrm_user_sec_ctx *uctx;
3232
3233 p += pol->sadb_x_policy_len*8;
3234 sec_ctx = (struct sadb_x_sec_ctx *)p;
3235 if (len < pol->sadb_x_policy_len*8 +
3236 sec_ctx->sadb_x_sec_len) {
3237 *dir = -EINVAL;
3238 goto out;
3239 }
3240 if ((*dir = verify_sec_ctx_len(p)))
3241 goto out;
3242 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3243 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3244 kfree(uctx);
3245
3246 if (*dir)
3247 goto out;
3248 }
3249
3250 *dir = pol->sadb_x_policy_dir-1;
3251 return xp;
3252
3253 out:
3254 xp->walk.dead = 1;
3255 xfrm_policy_destroy(xp);
3256 return NULL;
3257 }
3258
3259 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3260 {
3261 struct sk_buff *skb;
3262 struct sadb_msg *hdr;
3263 struct sadb_sa *sa;
3264 struct sadb_address *addr;
3265 struct sadb_x_nat_t_port *n_port;
3266 int sockaddr_size;
3267 int size;
3268 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3269 struct xfrm_encap_tmpl *natt = NULL;
3270
3271 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3272 if (!sockaddr_size)
3273 return -EINVAL;
3274
3275 if (!satype)
3276 return -EINVAL;
3277
3278 if (!x->encap)
3279 return -EINVAL;
3280
3281 natt = x->encap;
3282
3283 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3284 *
3285 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3286 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3287 */
3288
3289 size = sizeof(struct sadb_msg) +
3290 sizeof(struct sadb_sa) +
3291 (sizeof(struct sadb_address) * 2) +
3292 (sockaddr_size * 2) +
3293 (sizeof(struct sadb_x_nat_t_port) * 2);
3294
3295 skb = alloc_skb(size + 16, GFP_ATOMIC);
3296 if (skb == NULL)
3297 return -ENOMEM;
3298
3299 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3300 hdr->sadb_msg_version = PF_KEY_V2;
3301 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3302 hdr->sadb_msg_satype = satype;
3303 hdr->sadb_msg_len = size / sizeof(uint64_t);
3304 hdr->sadb_msg_errno = 0;
3305 hdr->sadb_msg_reserved = 0;
3306 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3307 hdr->sadb_msg_pid = 0;
3308
3309 /* SA */
3310 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3311 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3312 sa->sadb_sa_exttype = SADB_EXT_SA;
3313 sa->sadb_sa_spi = x->id.spi;
3314 sa->sadb_sa_replay = 0;
3315 sa->sadb_sa_state = 0;
3316 sa->sadb_sa_auth = 0;
3317 sa->sadb_sa_encrypt = 0;
3318 sa->sadb_sa_flags = 0;
3319
3320 /* ADDRESS_SRC (old addr) */
3321 addr = (struct sadb_address*)
3322 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3323 addr->sadb_address_len =
3324 (sizeof(struct sadb_address)+sockaddr_size)/
3325 sizeof(uint64_t);
3326 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3327 addr->sadb_address_proto = 0;
3328 addr->sadb_address_reserved = 0;
3329 addr->sadb_address_prefixlen =
3330 pfkey_sockaddr_fill(&x->props.saddr, 0,
3331 (struct sockaddr *) (addr + 1),
3332 x->props.family);
3333 if (!addr->sadb_address_prefixlen)
3334 BUG();
3335
3336 /* NAT_T_SPORT (old port) */
3337 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3338 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3339 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3340 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3341 n_port->sadb_x_nat_t_port_reserved = 0;
3342
3343 /* ADDRESS_DST (new addr) */
3344 addr = (struct sadb_address*)
3345 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3346 addr->sadb_address_len =
3347 (sizeof(struct sadb_address)+sockaddr_size)/
3348 sizeof(uint64_t);
3349 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3350 addr->sadb_address_proto = 0;
3351 addr->sadb_address_reserved = 0;
3352 addr->sadb_address_prefixlen =
3353 pfkey_sockaddr_fill(ipaddr, 0,
3354 (struct sockaddr *) (addr + 1),
3355 x->props.family);
3356 if (!addr->sadb_address_prefixlen)
3357 BUG();
3358
3359 /* NAT_T_DPORT (new port) */
3360 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3361 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3362 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3363 n_port->sadb_x_nat_t_port_port = sport;
3364 n_port->sadb_x_nat_t_port_reserved = 0;
3365
3366 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3367 }
3368
3369 #ifdef CONFIG_NET_KEY_MIGRATE
3370 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3371 const struct xfrm_selector *sel)
3372 {
3373 struct sadb_address *addr;
3374 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3375 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3376 addr->sadb_address_exttype = type;
3377 addr->sadb_address_proto = sel->proto;
3378 addr->sadb_address_reserved = 0;
3379
3380 switch (type) {
3381 case SADB_EXT_ADDRESS_SRC:
3382 addr->sadb_address_prefixlen = sel->prefixlen_s;
3383 pfkey_sockaddr_fill(&sel->saddr, 0,
3384 (struct sockaddr *)(addr + 1),
3385 sel->family);
3386 break;
3387 case SADB_EXT_ADDRESS_DST:
3388 addr->sadb_address_prefixlen = sel->prefixlen_d;
3389 pfkey_sockaddr_fill(&sel->daddr, 0,
3390 (struct sockaddr *)(addr + 1),
3391 sel->family);
3392 break;
3393 default:
3394 return -EINVAL;
3395 }
3396
3397 return 0;
3398 }
3399
3400
3401 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3402 {
3403 struct sadb_x_kmaddress *kma;
3404 u8 *sa;
3405 int family = k->family;
3406 int socklen = pfkey_sockaddr_len(family);
3407 int size_req;
3408
3409 size_req = (sizeof(struct sadb_x_kmaddress) +
3410 pfkey_sockaddr_pair_size(family));
3411
3412 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3413 memset(kma, 0, size_req);
3414 kma->sadb_x_kmaddress_len = size_req / 8;
3415 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3416 kma->sadb_x_kmaddress_reserved = k->reserved;
3417
3418 sa = (u8 *)(kma + 1);
3419 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3420 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3421 return -EINVAL;
3422
3423 return 0;
3424 }
3425
3426 static int set_ipsecrequest(struct sk_buff *skb,
3427 uint8_t proto, uint8_t mode, int level,
3428 uint32_t reqid, uint8_t family,
3429 const xfrm_address_t *src, const xfrm_address_t *dst)
3430 {
3431 struct sadb_x_ipsecrequest *rq;
3432 u8 *sa;
3433 int socklen = pfkey_sockaddr_len(family);
3434 int size_req;
3435
3436 size_req = sizeof(struct sadb_x_ipsecrequest) +
3437 pfkey_sockaddr_pair_size(family);
3438
3439 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3440 memset(rq, 0, size_req);
3441 rq->sadb_x_ipsecrequest_len = size_req;
3442 rq->sadb_x_ipsecrequest_proto = proto;
3443 rq->sadb_x_ipsecrequest_mode = mode;
3444 rq->sadb_x_ipsecrequest_level = level;
3445 rq->sadb_x_ipsecrequest_reqid = reqid;
3446
3447 sa = (u8 *) (rq + 1);
3448 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3449 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3450 return -EINVAL;
3451
3452 return 0;
3453 }
3454 #endif
3455
3456 #ifdef CONFIG_NET_KEY_MIGRATE
3457 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3458 const struct xfrm_migrate *m, int num_bundles,
3459 const struct xfrm_kmaddress *k)
3460 {
3461 int i;
3462 int sasize_sel;
3463 int size = 0;
3464 int size_pol = 0;
3465 struct sk_buff *skb;
3466 struct sadb_msg *hdr;
3467 struct sadb_x_policy *pol;
3468 const struct xfrm_migrate *mp;
3469
3470 if (type != XFRM_POLICY_TYPE_MAIN)
3471 return 0;
3472
3473 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3474 return -EINVAL;
3475
3476 if (k != NULL) {
3477 /* addresses for KM */
3478 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3479 pfkey_sockaddr_pair_size(k->family));
3480 }
3481
3482 /* selector */
3483 sasize_sel = pfkey_sockaddr_size(sel->family);
3484 if (!sasize_sel)
3485 return -EINVAL;
3486 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3487
3488 /* policy info */
3489 size_pol += sizeof(struct sadb_x_policy);
3490
3491 /* ipsecrequests */
3492 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3493 /* old locator pair */
3494 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3495 pfkey_sockaddr_pair_size(mp->old_family);
3496 /* new locator pair */
3497 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3498 pfkey_sockaddr_pair_size(mp->new_family);
3499 }
3500
3501 size += sizeof(struct sadb_msg) + size_pol;
3502
3503 /* alloc buffer */
3504 skb = alloc_skb(size, GFP_ATOMIC);
3505 if (skb == NULL)
3506 return -ENOMEM;
3507
3508 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3509 hdr->sadb_msg_version = PF_KEY_V2;
3510 hdr->sadb_msg_type = SADB_X_MIGRATE;
3511 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3512 hdr->sadb_msg_len = size / 8;
3513 hdr->sadb_msg_errno = 0;
3514 hdr->sadb_msg_reserved = 0;
3515 hdr->sadb_msg_seq = 0;
3516 hdr->sadb_msg_pid = 0;
3517
3518 /* Addresses to be used by KM for negotiation, if ext is available */
3519 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3520 goto err;
3521
3522 /* selector src */
3523 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3524
3525 /* selector dst */
3526 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3527
3528 /* policy information */
3529 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3530 pol->sadb_x_policy_len = size_pol / 8;
3531 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3532 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3533 pol->sadb_x_policy_dir = dir + 1;
3534 pol->sadb_x_policy_reserved = 0;
3535 pol->sadb_x_policy_id = 0;
3536 pol->sadb_x_policy_priority = 0;
3537
3538 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3539 /* old ipsecrequest */
3540 int mode = pfkey_mode_from_xfrm(mp->mode);
3541 if (mode < 0)
3542 goto err;
3543 if (set_ipsecrequest(skb, mp->proto, mode,
3544 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3545 mp->reqid, mp->old_family,
3546 &mp->old_saddr, &mp->old_daddr) < 0)
3547 goto err;
3548
3549 /* new ipsecrequest */
3550 if (set_ipsecrequest(skb, mp->proto, mode,
3551 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3552 mp->reqid, mp->new_family,
3553 &mp->new_saddr, &mp->new_daddr) < 0)
3554 goto err;
3555 }
3556
3557 /* broadcast migrate message to sockets */
3558 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3559
3560 return 0;
3561
3562 err:
3563 kfree_skb(skb);
3564 return -EINVAL;
3565 }
3566 #else
3567 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3568 const struct xfrm_migrate *m, int num_bundles,
3569 const struct xfrm_kmaddress *k)
3570 {
3571 return -ENOPROTOOPT;
3572 }
3573 #endif
3574
3575 static int pfkey_sendmsg(struct kiocb *kiocb,
3576 struct socket *sock, struct msghdr *msg, size_t len)
3577 {
3578 struct sock *sk = sock->sk;
3579 struct sk_buff *skb = NULL;
3580 struct sadb_msg *hdr = NULL;
3581 int err;
3582 struct net *net = sock_net(sk);
3583
3584 err = -EOPNOTSUPP;
3585 if (msg->msg_flags & MSG_OOB)
3586 goto out;
3587
3588 err = -EMSGSIZE;
3589 if ((unsigned int)len > sk->sk_sndbuf - 32)
3590 goto out;
3591
3592 err = -ENOBUFS;
3593 skb = alloc_skb(len, GFP_KERNEL);
3594 if (skb == NULL)
3595 goto out;
3596
3597 err = -EFAULT;
3598 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3599 goto out;
3600
3601 hdr = pfkey_get_base_msg(skb, &err);
3602 if (!hdr)
3603 goto out;
3604
3605 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3606 err = pfkey_process(sk, skb, hdr);
3607 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3608
3609 out:
3610 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3611 err = 0;
3612 kfree_skb(skb);
3613
3614 return err ? : len;
3615 }
3616
3617 static int pfkey_recvmsg(struct kiocb *kiocb,
3618 struct socket *sock, struct msghdr *msg, size_t len,
3619 int flags)
3620 {
3621 struct sock *sk = sock->sk;
3622 struct pfkey_sock *pfk = pfkey_sk(sk);
3623 struct sk_buff *skb;
3624 int copied, err;
3625
3626 err = -EINVAL;
3627 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3628 goto out;
3629
3630 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3631 if (skb == NULL)
3632 goto out;
3633
3634 copied = skb->len;
3635 if (copied > len) {
3636 msg->msg_flags |= MSG_TRUNC;
3637 copied = len;
3638 }
3639
3640 skb_reset_transport_header(skb);
3641 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3642 if (err)
3643 goto out_free;
3644
3645 sock_recv_ts_and_drops(msg, sk, skb);
3646
3647 err = (flags & MSG_TRUNC) ? skb->len : copied;
3648
3649 if (pfk->dump.dump != NULL &&
3650 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3651 pfkey_do_dump(pfk);
3652
3653 out_free:
3654 skb_free_datagram(sk, skb);
3655 out:
3656 return err;
3657 }
3658
3659 static const struct proto_ops pfkey_ops = {
3660 .family = PF_KEY,
3661 .owner = THIS_MODULE,
3662 /* Operations that make no sense on pfkey sockets. */
3663 .bind = sock_no_bind,
3664 .connect = sock_no_connect,
3665 .socketpair = sock_no_socketpair,
3666 .accept = sock_no_accept,
3667 .getname = sock_no_getname,
3668 .ioctl = sock_no_ioctl,
3669 .listen = sock_no_listen,
3670 .shutdown = sock_no_shutdown,
3671 .setsockopt = sock_no_setsockopt,
3672 .getsockopt = sock_no_getsockopt,
3673 .mmap = sock_no_mmap,
3674 .sendpage = sock_no_sendpage,
3675
3676 /* Now the operations that really occur. */
3677 .release = pfkey_release,
3678 .poll = datagram_poll,
3679 .sendmsg = pfkey_sendmsg,
3680 .recvmsg = pfkey_recvmsg,
3681 };
3682
3683 static const struct net_proto_family pfkey_family_ops = {
3684 .family = PF_KEY,
3685 .create = pfkey_create,
3686 .owner = THIS_MODULE,
3687 };
3688
3689 #ifdef CONFIG_PROC_FS
3690 static int pfkey_seq_show(struct seq_file *f, void *v)
3691 {
3692 struct sock *s = sk_entry(v);
3693
3694 if (v == SEQ_START_TOKEN)
3695 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3696 else
3697 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3698 s,
3699 atomic_read(&s->sk_refcnt),
3700 sk_rmem_alloc_get(s),
3701 sk_wmem_alloc_get(s),
3702 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3703 sock_i_ino(s)
3704 );
3705 return 0;
3706 }
3707
3708 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3709 __acquires(rcu)
3710 {
3711 struct net *net = seq_file_net(f);
3712 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3713
3714 rcu_read_lock();
3715 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3716 }
3717
3718 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3719 {
3720 struct net *net = seq_file_net(f);
3721 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3722
3723 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3724 }
3725
3726 static void pfkey_seq_stop(struct seq_file *f, void *v)
3727 __releases(rcu)
3728 {
3729 rcu_read_unlock();
3730 }
3731
3732 static const struct seq_operations pfkey_seq_ops = {
3733 .start = pfkey_seq_start,
3734 .next = pfkey_seq_next,
3735 .stop = pfkey_seq_stop,
3736 .show = pfkey_seq_show,
3737 };
3738
3739 static int pfkey_seq_open(struct inode *inode, struct file *file)
3740 {
3741 return seq_open_net(inode, file, &pfkey_seq_ops,
3742 sizeof(struct seq_net_private));
3743 }
3744
3745 static const struct file_operations pfkey_proc_ops = {
3746 .open = pfkey_seq_open,
3747 .read = seq_read,
3748 .llseek = seq_lseek,
3749 .release = seq_release_net,
3750 };
3751
3752 static int __net_init pfkey_init_proc(struct net *net)
3753 {
3754 struct proc_dir_entry *e;
3755
3756 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3757 if (e == NULL)
3758 return -ENOMEM;
3759
3760 return 0;
3761 }
3762
3763 static void __net_exit pfkey_exit_proc(struct net *net)
3764 {
3765 remove_proc_entry("pfkey", net->proc_net);
3766 }
3767 #else
3768 static inline int pfkey_init_proc(struct net *net)
3769 {
3770 return 0;
3771 }
3772
3773 static inline void pfkey_exit_proc(struct net *net)
3774 {
3775 }
3776 #endif
3777
3778 static struct xfrm_mgr pfkeyv2_mgr =
3779 {
3780 .id = "pfkeyv2",
3781 .notify = pfkey_send_notify,
3782 .acquire = pfkey_send_acquire,
3783 .compile_policy = pfkey_compile_policy,
3784 .new_mapping = pfkey_send_new_mapping,
3785 .notify_policy = pfkey_send_policy_notify,
3786 .migrate = pfkey_send_migrate,
3787 };
3788
3789 static int __net_init pfkey_net_init(struct net *net)
3790 {
3791 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3792 int rv;
3793
3794 INIT_HLIST_HEAD(&net_pfkey->table);
3795 atomic_set(&net_pfkey->socks_nr, 0);
3796
3797 rv = pfkey_init_proc(net);
3798
3799 return rv;
3800 }
3801
3802 static void __net_exit pfkey_net_exit(struct net *net)
3803 {
3804 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3805
3806 pfkey_exit_proc(net);
3807 BUG_ON(!hlist_empty(&net_pfkey->table));
3808 }
3809
3810 static struct pernet_operations pfkey_net_ops = {
3811 .init = pfkey_net_init,
3812 .exit = pfkey_net_exit,
3813 .id = &pfkey_net_id,
3814 .size = sizeof(struct netns_pfkey),
3815 };
3816
3817 static void __exit ipsec_pfkey_exit(void)
3818 {
3819 xfrm_unregister_km(&pfkeyv2_mgr);
3820 sock_unregister(PF_KEY);
3821 unregister_pernet_subsys(&pfkey_net_ops);
3822 proto_unregister(&key_proto);
3823 }
3824
3825 static int __init ipsec_pfkey_init(void)
3826 {
3827 int err = proto_register(&key_proto, 0);
3828
3829 if (err != 0)
3830 goto out;
3831
3832 err = register_pernet_subsys(&pfkey_net_ops);
3833 if (err != 0)
3834 goto out_unregister_key_proto;
3835 err = sock_register(&pfkey_family_ops);
3836 if (err != 0)
3837 goto out_unregister_pernet;
3838 err = xfrm_register_km(&pfkeyv2_mgr);
3839 if (err != 0)
3840 goto out_sock_unregister;
3841 out:
3842 return err;
3843
3844 out_sock_unregister:
3845 sock_unregister(PF_KEY);
3846 out_unregister_pernet:
3847 unregister_pernet_subsys(&pfkey_net_ops);
3848 out_unregister_key_proto:
3849 proto_unregister(&key_proto);
3850 goto out;
3851 }
3852
3853 module_init(ipsec_pfkey_init);
3854 module_exit(ipsec_pfkey_exit);
3855 MODULE_LICENSE("GPL");
3856 MODULE_ALIAS_NETPROTO(PF_KEY);
Linux kernel - Deliverables
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