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netlink: Rename pid to portid to avoid confusion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / key / af_key.c
1 /*
2 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Maxim Giryaev <gem@asplinux.ru>
10 * David S. Miller <davem@redhat.com>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14 * Derek Atkins <derek@ihtfp.com>
15 */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41 /* List of all pfkey sockets. */
42 struct hlist_head table;
43 atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50 /* struct sock must be the first member of struct pfkey_sock */
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70 return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76 return 1;
77 return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82 if (pfk->dump.dump) {
83 if (pfk->dump.skb) {
84 kfree_skb(pfk->dump.skb);
85 pfk->dump.skb = NULL;
86 }
87 pfk->dump.done(pfk);
88 pfk->dump.dump = NULL;
89 pfk->dump.done = NULL;
90 }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95 struct net *net = sock_net(sk);
96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98 pfkey_terminate_dump(pfkey_sk(sk));
99 skb_queue_purge(&sk->sk_receive_queue);
100
101 if (!sock_flag(sk, SOCK_DEAD)) {
102 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103 return;
104 }
105
106 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109 atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116 struct net *net = sock_net(sk);
117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119 mutex_lock(&pfkey_mutex);
120 sk_add_node_rcu(sk, &net_pfkey->table);
121 mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126 mutex_lock(&pfkey_mutex);
127 sk_del_node_init_rcu(sk);
128 mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132 .name = "KEY",
133 .owner = THIS_MODULE,
134 .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138 int kern)
139 {
140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141 struct sock *sk;
142 int err;
143
144 if (!capable(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_orphan(*skb2);
207 skb_set_owner_r(*skb2, sk);
208 skb_queue_tail(&sk->sk_receive_queue, *skb2);
209 sk->sk_data_ready(sk, (*skb2)->len);
210 *skb2 = NULL;
211 err = 0;
212 }
213 }
214 sock_put(sk);
215 return err;
216 }
217
218 /* Send SKB to all pfkey sockets matching selected criteria. */
219 #define BROADCAST_ALL 0
220 #define BROADCAST_ONE 1
221 #define BROADCAST_REGISTERED 2
222 #define BROADCAST_PROMISC_ONLY 4
223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
224 int broadcast_flags, struct sock *one_sk,
225 struct net *net)
226 {
227 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
228 struct sock *sk;
229 struct hlist_node *node;
230 struct sk_buff *skb2 = NULL;
231 int err = -ESRCH;
232
233 /* XXX Do we need something like netlink_overrun? I think
234 * XXX PF_KEY socket apps will not mind current behavior.
235 */
236 if (!skb)
237 return -ENOMEM;
238
239 rcu_read_lock();
240 sk_for_each_rcu(sk, node, &net_pfkey->table) {
241 struct pfkey_sock *pfk = pfkey_sk(sk);
242 int err2;
243
244 /* Yes, it means that if you are meant to receive this
245 * pfkey message you receive it twice as promiscuous
246 * socket.
247 */
248 if (pfk->promisc)
249 pfkey_broadcast_one(skb, &skb2, allocation, sk);
250
251 /* the exact target will be processed later */
252 if (sk == one_sk)
253 continue;
254 if (broadcast_flags != BROADCAST_ALL) {
255 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
256 continue;
257 if ((broadcast_flags & BROADCAST_REGISTERED) &&
258 !pfk->registered)
259 continue;
260 if (broadcast_flags & BROADCAST_ONE)
261 continue;
262 }
263
264 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
265
266 /* Error is cleare after succecful sending to at least one
267 * registered KM */
268 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
269 err = err2;
270 }
271 rcu_read_unlock();
272
273 if (one_sk != NULL)
274 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
275
276 kfree_skb(skb2);
277 kfree_skb(skb);
278 return err;
279 }
280
281 static int pfkey_do_dump(struct pfkey_sock *pfk)
282 {
283 struct sadb_msg *hdr;
284 int rc;
285
286 rc = pfk->dump.dump(pfk);
287 if (rc == -ENOBUFS)
288 return 0;
289
290 if (pfk->dump.skb) {
291 if (!pfkey_can_dump(&pfk->sk))
292 return 0;
293
294 hdr = (struct sadb_msg *) pfk->dump.skb->data;
295 hdr->sadb_msg_seq = 0;
296 hdr->sadb_msg_errno = rc;
297 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
298 &pfk->sk, sock_net(&pfk->sk));
299 pfk->dump.skb = NULL;
300 }
301
302 pfkey_terminate_dump(pfk);
303 return rc;
304 }
305
306 static inline void pfkey_hdr_dup(struct sadb_msg *new,
307 const struct sadb_msg *orig)
308 {
309 *new = *orig;
310 }
311
312 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
313 {
314 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
315 struct sadb_msg *hdr;
316
317 if (!skb)
318 return -ENOBUFS;
319
320 /* Woe be to the platform trying to support PFKEY yet
321 * having normal errnos outside the 1-255 range, inclusive.
322 */
323 err = -err;
324 if (err == ERESTARTSYS ||
325 err == ERESTARTNOHAND ||
326 err == ERESTARTNOINTR)
327 err = EINTR;
328 if (err >= 512)
329 err = EINVAL;
330 BUG_ON(err <= 0 || err >= 256);
331
332 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
333 pfkey_hdr_dup(hdr, orig);
334 hdr->sadb_msg_errno = (uint8_t) err;
335 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
336 sizeof(uint64_t));
337
338 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
339
340 return 0;
341 }
342
343 static u8 sadb_ext_min_len[] = {
344 [SADB_EXT_RESERVED] = (u8) 0,
345 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
346 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
347 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
348 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
349 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
350 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
351 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
352 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
353 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
354 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
355 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
356 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
357 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
358 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
359 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
360 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
361 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
362 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
363 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
364 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
365 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
366 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
367 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
368 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
369 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
370 };
371
372 /* Verify sadb_address_{len,prefixlen} against sa_family. */
373 static int verify_address_len(const void *p)
374 {
375 const struct sadb_address *sp = p;
376 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
377 const struct sockaddr_in *sin;
378 #if IS_ENABLED(CONFIG_IPV6)
379 const struct sockaddr_in6 *sin6;
380 #endif
381 int len;
382
383 switch (addr->sa_family) {
384 case AF_INET:
385 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
386 if (sp->sadb_address_len != len ||
387 sp->sadb_address_prefixlen > 32)
388 return -EINVAL;
389 break;
390 #if IS_ENABLED(CONFIG_IPV6)
391 case AF_INET6:
392 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
393 if (sp->sadb_address_len != len ||
394 sp->sadb_address_prefixlen > 128)
395 return -EINVAL;
396 break;
397 #endif
398 default:
399 /* It is user using kernel to keep track of security
400 * associations for another protocol, such as
401 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
402 * lengths.
403 *
404 * XXX Actually, association/policy database is not yet
405 * XXX able to cope with arbitrary sockaddr families.
406 * XXX When it can, remove this -EINVAL. -DaveM
407 */
408 return -EINVAL;
409 break;
410 }
411
412 return 0;
413 }
414
415 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
416 {
417 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
418 sec_ctx->sadb_x_ctx_len,
419 sizeof(uint64_t));
420 }
421
422 static inline int verify_sec_ctx_len(const void *p)
423 {
424 const struct sadb_x_sec_ctx *sec_ctx = p;
425 int len = sec_ctx->sadb_x_ctx_len;
426
427 if (len > PAGE_SIZE)
428 return -EINVAL;
429
430 len = pfkey_sec_ctx_len(sec_ctx);
431
432 if (sec_ctx->sadb_x_sec_len != len)
433 return -EINVAL;
434
435 return 0;
436 }
437
438 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
439 {
440 struct xfrm_user_sec_ctx *uctx = NULL;
441 int ctx_size = sec_ctx->sadb_x_ctx_len;
442
443 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
444
445 if (!uctx)
446 return NULL;
447
448 uctx->len = pfkey_sec_ctx_len(sec_ctx);
449 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
450 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
451 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
452 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
453 memcpy(uctx + 1, sec_ctx + 1,
454 uctx->ctx_len);
455
456 return uctx;
457 }
458
459 static int present_and_same_family(const struct sadb_address *src,
460 const struct sadb_address *dst)
461 {
462 const struct sockaddr *s_addr, *d_addr;
463
464 if (!src || !dst)
465 return 0;
466
467 s_addr = (const struct sockaddr *)(src + 1);
468 d_addr = (const struct sockaddr *)(dst + 1);
469 if (s_addr->sa_family != d_addr->sa_family)
470 return 0;
471 if (s_addr->sa_family != AF_INET
472 #if IS_ENABLED(CONFIG_IPV6)
473 && s_addr->sa_family != AF_INET6
474 #endif
475 )
476 return 0;
477
478 return 1;
479 }
480
481 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
482 {
483 const char *p = (char *) hdr;
484 int len = skb->len;
485
486 len -= sizeof(*hdr);
487 p += sizeof(*hdr);
488 while (len > 0) {
489 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
490 uint16_t ext_type;
491 int ext_len;
492
493 ext_len = ehdr->sadb_ext_len;
494 ext_len *= sizeof(uint64_t);
495 ext_type = ehdr->sadb_ext_type;
496 if (ext_len < sizeof(uint64_t) ||
497 ext_len > len ||
498 ext_type == SADB_EXT_RESERVED)
499 return -EINVAL;
500
501 if (ext_type <= SADB_EXT_MAX) {
502 int min = (int) sadb_ext_min_len[ext_type];
503 if (ext_len < min)
504 return -EINVAL;
505 if (ext_hdrs[ext_type-1] != NULL)
506 return -EINVAL;
507 if (ext_type == SADB_EXT_ADDRESS_SRC ||
508 ext_type == SADB_EXT_ADDRESS_DST ||
509 ext_type == SADB_EXT_ADDRESS_PROXY ||
510 ext_type == SADB_X_EXT_NAT_T_OA) {
511 if (verify_address_len(p))
512 return -EINVAL;
513 }
514 if (ext_type == SADB_X_EXT_SEC_CTX) {
515 if (verify_sec_ctx_len(p))
516 return -EINVAL;
517 }
518 ext_hdrs[ext_type-1] = (void *) p;
519 }
520 p += ext_len;
521 len -= ext_len;
522 }
523
524 return 0;
525 }
526
527 static uint16_t
528 pfkey_satype2proto(uint8_t satype)
529 {
530 switch (satype) {
531 case SADB_SATYPE_UNSPEC:
532 return IPSEC_PROTO_ANY;
533 case SADB_SATYPE_AH:
534 return IPPROTO_AH;
535 case SADB_SATYPE_ESP:
536 return IPPROTO_ESP;
537 case SADB_X_SATYPE_IPCOMP:
538 return IPPROTO_COMP;
539 break;
540 default:
541 return 0;
542 }
543 /* NOTREACHED */
544 }
545
546 static uint8_t
547 pfkey_proto2satype(uint16_t proto)
548 {
549 switch (proto) {
550 case IPPROTO_AH:
551 return SADB_SATYPE_AH;
552 case IPPROTO_ESP:
553 return SADB_SATYPE_ESP;
554 case IPPROTO_COMP:
555 return SADB_X_SATYPE_IPCOMP;
556 break;
557 default:
558 return 0;
559 }
560 /* NOTREACHED */
561 }
562
563 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
564 * say specifically 'just raw sockets' as we encode them as 255.
565 */
566
567 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
568 {
569 return proto == IPSEC_PROTO_ANY ? 0 : proto;
570 }
571
572 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
573 {
574 return proto ? proto : IPSEC_PROTO_ANY;
575 }
576
577 static inline int pfkey_sockaddr_len(sa_family_t family)
578 {
579 switch (family) {
580 case AF_INET:
581 return sizeof(struct sockaddr_in);
582 #if IS_ENABLED(CONFIG_IPV6)
583 case AF_INET6:
584 return sizeof(struct sockaddr_in6);
585 #endif
586 }
587 return 0;
588 }
589
590 static
591 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
592 {
593 switch (sa->sa_family) {
594 case AF_INET:
595 xaddr->a4 =
596 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
597 return AF_INET;
598 #if IS_ENABLED(CONFIG_IPV6)
599 case AF_INET6:
600 memcpy(xaddr->a6,
601 &((struct sockaddr_in6 *)sa)->sin6_addr,
602 sizeof(struct in6_addr));
603 return AF_INET6;
604 #endif
605 }
606 return 0;
607 }
608
609 static
610 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
611 {
612 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
613 xaddr);
614 }
615
616 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
617 {
618 const struct sadb_sa *sa;
619 const struct sadb_address *addr;
620 uint16_t proto;
621 unsigned short family;
622 xfrm_address_t *xaddr;
623
624 sa = ext_hdrs[SADB_EXT_SA - 1];
625 if (sa == NULL)
626 return NULL;
627
628 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
629 if (proto == 0)
630 return NULL;
631
632 /* sadb_address_len should be checked by caller */
633 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
634 if (addr == NULL)
635 return NULL;
636
637 family = ((const struct sockaddr *)(addr + 1))->sa_family;
638 switch (family) {
639 case AF_INET:
640 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
641 break;
642 #if IS_ENABLED(CONFIG_IPV6)
643 case AF_INET6:
644 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
645 break;
646 #endif
647 default:
648 xaddr = NULL;
649 }
650
651 if (!xaddr)
652 return NULL;
653
654 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
655 }
656
657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
658
659 static int
660 pfkey_sockaddr_size(sa_family_t family)
661 {
662 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
663 }
664
665 static inline int pfkey_mode_from_xfrm(int mode)
666 {
667 switch(mode) {
668 case XFRM_MODE_TRANSPORT:
669 return IPSEC_MODE_TRANSPORT;
670 case XFRM_MODE_TUNNEL:
671 return IPSEC_MODE_TUNNEL;
672 case XFRM_MODE_BEET:
673 return IPSEC_MODE_BEET;
674 default:
675 return -1;
676 }
677 }
678
679 static inline int pfkey_mode_to_xfrm(int mode)
680 {
681 switch(mode) {
682 case IPSEC_MODE_ANY: /*XXX*/
683 case IPSEC_MODE_TRANSPORT:
684 return XFRM_MODE_TRANSPORT;
685 case IPSEC_MODE_TUNNEL:
686 return XFRM_MODE_TUNNEL;
687 case IPSEC_MODE_BEET:
688 return XFRM_MODE_BEET;
689 default:
690 return -1;
691 }
692 }
693
694 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
695 struct sockaddr *sa,
696 unsigned short family)
697 {
698 switch (family) {
699 case AF_INET:
700 {
701 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
702 sin->sin_family = AF_INET;
703 sin->sin_port = port;
704 sin->sin_addr.s_addr = xaddr->a4;
705 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
706 return 32;
707 }
708 #if IS_ENABLED(CONFIG_IPV6)
709 case AF_INET6:
710 {
711 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
712 sin6->sin6_family = AF_INET6;
713 sin6->sin6_port = port;
714 sin6->sin6_flowinfo = 0;
715 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
716 sin6->sin6_scope_id = 0;
717 return 128;
718 }
719 #endif
720 }
721 return 0;
722 }
723
724 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
725 int add_keys, int hsc)
726 {
727 struct sk_buff *skb;
728 struct sadb_msg *hdr;
729 struct sadb_sa *sa;
730 struct sadb_lifetime *lifetime;
731 struct sadb_address *addr;
732 struct sadb_key *key;
733 struct sadb_x_sa2 *sa2;
734 struct sadb_x_sec_ctx *sec_ctx;
735 struct xfrm_sec_ctx *xfrm_ctx;
736 int ctx_size = 0;
737 int size;
738 int auth_key_size = 0;
739 int encrypt_key_size = 0;
740 int sockaddr_size;
741 struct xfrm_encap_tmpl *natt = NULL;
742 int mode;
743
744 /* address family check */
745 sockaddr_size = pfkey_sockaddr_size(x->props.family);
746 if (!sockaddr_size)
747 return ERR_PTR(-EINVAL);
748
749 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
750 key(AE), (identity(SD),) (sensitivity)> */
751 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
752 sizeof(struct sadb_lifetime) +
753 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
754 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
755 sizeof(struct sadb_address)*2 +
756 sockaddr_size*2 +
757 sizeof(struct sadb_x_sa2);
758
759 if ((xfrm_ctx = x->security)) {
760 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
761 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
762 }
763
764 /* identity & sensitivity */
765 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
766 size += sizeof(struct sadb_address) + sockaddr_size;
767
768 if (add_keys) {
769 if (x->aalg && x->aalg->alg_key_len) {
770 auth_key_size =
771 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
772 size += sizeof(struct sadb_key) + auth_key_size;
773 }
774 if (x->ealg && x->ealg->alg_key_len) {
775 encrypt_key_size =
776 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
777 size += sizeof(struct sadb_key) + encrypt_key_size;
778 }
779 }
780 if (x->encap)
781 natt = x->encap;
782
783 if (natt && natt->encap_type) {
784 size += sizeof(struct sadb_x_nat_t_type);
785 size += sizeof(struct sadb_x_nat_t_port);
786 size += sizeof(struct sadb_x_nat_t_port);
787 }
788
789 skb = alloc_skb(size + 16, GFP_ATOMIC);
790 if (skb == NULL)
791 return ERR_PTR(-ENOBUFS);
792
793 /* call should fill header later */
794 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
795 memset(hdr, 0, size); /* XXX do we need this ? */
796 hdr->sadb_msg_len = size / sizeof(uint64_t);
797
798 /* sa */
799 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
800 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
801 sa->sadb_sa_exttype = SADB_EXT_SA;
802 sa->sadb_sa_spi = x->id.spi;
803 sa->sadb_sa_replay = x->props.replay_window;
804 switch (x->km.state) {
805 case XFRM_STATE_VALID:
806 sa->sadb_sa_state = x->km.dying ?
807 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
808 break;
809 case XFRM_STATE_ACQ:
810 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
811 break;
812 default:
813 sa->sadb_sa_state = SADB_SASTATE_DEAD;
814 break;
815 }
816 sa->sadb_sa_auth = 0;
817 if (x->aalg) {
818 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
819 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
820 }
821 sa->sadb_sa_encrypt = 0;
822 BUG_ON(x->ealg && x->calg);
823 if (x->ealg) {
824 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
825 sa->sadb_sa_encrypt = a ? a->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->desc.sadb_alg_id : 0;
831 }
832
833 sa->sadb_sa_flags = 0;
834 if (x->props.flags & XFRM_STATE_NOECN)
835 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
836 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
837 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
838 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
839 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
840
841 /* hard time */
842 if (hsc & 2) {
843 lifetime = (struct sadb_lifetime *) skb_put(skb,
844 sizeof(struct sadb_lifetime));
845 lifetime->sadb_lifetime_len =
846 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
847 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
848 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
849 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
850 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
851 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
852 }
853 /* soft time */
854 if (hsc & 1) {
855 lifetime = (struct sadb_lifetime *) skb_put(skb,
856 sizeof(struct sadb_lifetime));
857 lifetime->sadb_lifetime_len =
858 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
859 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
860 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
861 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
862 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
863 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
864 }
865 /* current time */
866 lifetime = (struct sadb_lifetime *) skb_put(skb,
867 sizeof(struct sadb_lifetime));
868 lifetime->sadb_lifetime_len =
869 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
870 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
871 lifetime->sadb_lifetime_allocations = x->curlft.packets;
872 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
873 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
874 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
875 /* src address */
876 addr = (struct sadb_address*) skb_put(skb,
877 sizeof(struct sadb_address)+sockaddr_size);
878 addr->sadb_address_len =
879 (sizeof(struct sadb_address)+sockaddr_size)/
880 sizeof(uint64_t);
881 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
882 /* "if the ports are non-zero, then the sadb_address_proto field,
883 normally zero, MUST be filled in with the transport
884 protocol's number." - RFC2367 */
885 addr->sadb_address_proto = 0;
886 addr->sadb_address_reserved = 0;
887
888 addr->sadb_address_prefixlen =
889 pfkey_sockaddr_fill(&x->props.saddr, 0,
890 (struct sockaddr *) (addr + 1),
891 x->props.family);
892 if (!addr->sadb_address_prefixlen)
893 BUG();
894
895 /* dst address */
896 addr = (struct sadb_address*) skb_put(skb,
897 sizeof(struct sadb_address)+sockaddr_size);
898 addr->sadb_address_len =
899 (sizeof(struct sadb_address)+sockaddr_size)/
900 sizeof(uint64_t);
901 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
902 addr->sadb_address_proto = 0;
903 addr->sadb_address_reserved = 0;
904
905 addr->sadb_address_prefixlen =
906 pfkey_sockaddr_fill(&x->id.daddr, 0,
907 (struct sockaddr *) (addr + 1),
908 x->props.family);
909 if (!addr->sadb_address_prefixlen)
910 BUG();
911
912 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
913 x->props.family)) {
914 addr = (struct sadb_address*) skb_put(skb,
915 sizeof(struct sadb_address)+sockaddr_size);
916 addr->sadb_address_len =
917 (sizeof(struct sadb_address)+sockaddr_size)/
918 sizeof(uint64_t);
919 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
920 addr->sadb_address_proto =
921 pfkey_proto_from_xfrm(x->sel.proto);
922 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
923 addr->sadb_address_reserved = 0;
924
925 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
926 (struct sockaddr *) (addr + 1),
927 x->props.family);
928 }
929
930 /* auth key */
931 if (add_keys && auth_key_size) {
932 key = (struct sadb_key *) skb_put(skb,
933 sizeof(struct sadb_key)+auth_key_size);
934 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
935 sizeof(uint64_t);
936 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
937 key->sadb_key_bits = x->aalg->alg_key_len;
938 key->sadb_key_reserved = 0;
939 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
940 }
941 /* encrypt key */
942 if (add_keys && encrypt_key_size) {
943 key = (struct sadb_key *) skb_put(skb,
944 sizeof(struct sadb_key)+encrypt_key_size);
945 key->sadb_key_len = (sizeof(struct sadb_key) +
946 encrypt_key_size) / sizeof(uint64_t);
947 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
948 key->sadb_key_bits = x->ealg->alg_key_len;
949 key->sadb_key_reserved = 0;
950 memcpy(key + 1, x->ealg->alg_key,
951 (x->ealg->alg_key_len+7)/8);
952 }
953
954 /* sa */
955 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
956 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
957 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
958 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
959 kfree_skb(skb);
960 return ERR_PTR(-EINVAL);
961 }
962 sa2->sadb_x_sa2_mode = mode;
963 sa2->sadb_x_sa2_reserved1 = 0;
964 sa2->sadb_x_sa2_reserved2 = 0;
965 sa2->sadb_x_sa2_sequence = 0;
966 sa2->sadb_x_sa2_reqid = x->props.reqid;
967
968 if (natt && natt->encap_type) {
969 struct sadb_x_nat_t_type *n_type;
970 struct sadb_x_nat_t_port *n_port;
971
972 /* type */
973 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
974 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
975 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
976 n_type->sadb_x_nat_t_type_type = natt->encap_type;
977 n_type->sadb_x_nat_t_type_reserved[0] = 0;
978 n_type->sadb_x_nat_t_type_reserved[1] = 0;
979 n_type->sadb_x_nat_t_type_reserved[2] = 0;
980
981 /* source port */
982 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
983 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
984 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
985 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
986 n_port->sadb_x_nat_t_port_reserved = 0;
987
988 /* dest port */
989 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
990 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
991 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
992 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
993 n_port->sadb_x_nat_t_port_reserved = 0;
994 }
995
996 /* security context */
997 if (xfrm_ctx) {
998 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
999 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1000 sec_ctx->sadb_x_sec_len =
1001 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1002 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1003 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1004 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1005 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1006 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1007 xfrm_ctx->ctx_len);
1008 }
1009
1010 return skb;
1011 }
1012
1013
1014 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015 {
1016 struct sk_buff *skb;
1017
1018 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1019
1020 return skb;
1021 }
1022
1023 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024 int hsc)
1025 {
1026 return __pfkey_xfrm_state2msg(x, 0, hsc);
1027 }
1028
1029 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030 const struct sadb_msg *hdr,
1031 void * const *ext_hdrs)
1032 {
1033 struct xfrm_state *x;
1034 const struct sadb_lifetime *lifetime;
1035 const struct sadb_sa *sa;
1036 const struct sadb_key *key;
1037 const struct sadb_x_sec_ctx *sec_ctx;
1038 uint16_t proto;
1039 int err;
1040
1041
1042 sa = ext_hdrs[SADB_EXT_SA - 1];
1043 if (!sa ||
1044 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1045 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1046 return ERR_PTR(-EINVAL);
1047 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1048 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1049 return ERR_PTR(-EINVAL);
1050 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1051 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1052 return ERR_PTR(-EINVAL);
1053 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1054 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1055 return ERR_PTR(-EINVAL);
1056
1057 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1058 if (proto == 0)
1059 return ERR_PTR(-EINVAL);
1060
1061 /* default error is no buffer space */
1062 err = -ENOBUFS;
1063
1064 /* RFC2367:
1065
1066 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1067 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1068 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1069 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1070 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1071 not true.
1072
1073 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1074 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1075 */
1076 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1077 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1078 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1079 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1080 return ERR_PTR(-EINVAL);
1081 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1082 if (key != NULL &&
1083 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1084 ((key->sadb_key_bits+7) / 8 == 0 ||
1085 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1086 return ERR_PTR(-EINVAL);
1087 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1088 if (key != NULL &&
1089 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1090 ((key->sadb_key_bits+7) / 8 == 0 ||
1091 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092 return ERR_PTR(-EINVAL);
1093
1094 x = xfrm_state_alloc(net);
1095 if (x == NULL)
1096 return ERR_PTR(-ENOBUFS);
1097
1098 x->id.proto = proto;
1099 x->id.spi = sa->sadb_sa_spi;
1100 x->props.replay_window = sa->sadb_sa_replay;
1101 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1102 x->props.flags |= XFRM_STATE_NOECN;
1103 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1104 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1105 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1106 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1107
1108 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1109 if (lifetime != NULL) {
1110 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1111 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1112 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1113 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1114 }
1115 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1116 if (lifetime != NULL) {
1117 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1118 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1119 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1120 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1121 }
1122
1123 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1124 if (sec_ctx != NULL) {
1125 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1126
1127 if (!uctx)
1128 goto out;
1129
1130 err = security_xfrm_state_alloc(x, uctx);
1131 kfree(uctx);
1132
1133 if (err)
1134 goto out;
1135 }
1136
1137 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1138 if (sa->sadb_sa_auth) {
1139 int keysize = 0;
1140 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1141 if (!a) {
1142 err = -ENOSYS;
1143 goto out;
1144 }
1145 if (key)
1146 keysize = (key->sadb_key_bits + 7) / 8;
1147 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1148 if (!x->aalg)
1149 goto out;
1150 strcpy(x->aalg->alg_name, a->name);
1151 x->aalg->alg_key_len = 0;
1152 if (key) {
1153 x->aalg->alg_key_len = key->sadb_key_bits;
1154 memcpy(x->aalg->alg_key, key+1, keysize);
1155 }
1156 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1157 x->props.aalgo = sa->sadb_sa_auth;
1158 /* x->algo.flags = sa->sadb_sa_flags; */
1159 }
1160 if (sa->sadb_sa_encrypt) {
1161 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1162 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1163 if (!a) {
1164 err = -ENOSYS;
1165 goto out;
1166 }
1167 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1168 if (!x->calg)
1169 goto out;
1170 strcpy(x->calg->alg_name, a->name);
1171 x->props.calgo = sa->sadb_sa_encrypt;
1172 } else {
1173 int keysize = 0;
1174 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1175 if (!a) {
1176 err = -ENOSYS;
1177 goto out;
1178 }
1179 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1180 if (key)
1181 keysize = (key->sadb_key_bits + 7) / 8;
1182 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1183 if (!x->ealg)
1184 goto out;
1185 strcpy(x->ealg->alg_name, a->name);
1186 x->ealg->alg_key_len = 0;
1187 if (key) {
1188 x->ealg->alg_key_len = key->sadb_key_bits;
1189 memcpy(x->ealg->alg_key, key+1, keysize);
1190 }
1191 x->props.ealgo = sa->sadb_sa_encrypt;
1192 }
1193 }
1194 /* x->algo.flags = sa->sadb_sa_flags; */
1195
1196 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1197 &x->props.saddr);
1198 if (!x->props.family) {
1199 err = -EAFNOSUPPORT;
1200 goto out;
1201 }
1202 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203 &x->id.daddr);
1204
1205 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208 if (mode < 0) {
1209 err = -EINVAL;
1210 goto out;
1211 }
1212 x->props.mode = mode;
1213 x->props.reqid = sa2->sadb_x_sa2_reqid;
1214 }
1215
1216 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218
1219 /* Nobody uses this, but we try. */
1220 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222 }
1223
1224 if (!x->sel.family)
1225 x->sel.family = x->props.family;
1226
1227 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228 const struct sadb_x_nat_t_type* n_type;
1229 struct xfrm_encap_tmpl *natt;
1230
1231 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232 if (!x->encap)
1233 goto out;
1234
1235 natt = x->encap;
1236 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238
1239 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240 const struct sadb_x_nat_t_port *n_port =
1241 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243 }
1244 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245 const struct sadb_x_nat_t_port *n_port =
1246 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248 }
1249 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250 }
1251
1252 err = xfrm_init_state(x);
1253 if (err)
1254 goto out;
1255
1256 x->km.seq = hdr->sadb_msg_seq;
1257 return x;
1258
1259 out:
1260 x->km.state = XFRM_STATE_DEAD;
1261 xfrm_state_put(x);
1262 return ERR_PTR(err);
1263 }
1264
1265 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266 {
1267 return -EOPNOTSUPP;
1268 }
1269
1270 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271 {
1272 struct net *net = sock_net(sk);
1273 struct sk_buff *resp_skb;
1274 struct sadb_x_sa2 *sa2;
1275 struct sadb_address *saddr, *daddr;
1276 struct sadb_msg *out_hdr;
1277 struct sadb_spirange *range;
1278 struct xfrm_state *x = NULL;
1279 int mode;
1280 int err;
1281 u32 min_spi, max_spi;
1282 u32 reqid;
1283 u8 proto;
1284 unsigned short family;
1285 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286
1287 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289 return -EINVAL;
1290
1291 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292 if (proto == 0)
1293 return -EINVAL;
1294
1295 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297 if (mode < 0)
1298 return -EINVAL;
1299 reqid = sa2->sadb_x_sa2_reqid;
1300 } else {
1301 mode = 0;
1302 reqid = 0;
1303 }
1304
1305 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307
1308 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309 switch (family) {
1310 case AF_INET:
1311 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313 break;
1314 #if IS_ENABLED(CONFIG_IPV6)
1315 case AF_INET6:
1316 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318 break;
1319 #endif
1320 }
1321
1322 if (hdr->sadb_msg_seq) {
1323 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1325 xfrm_state_put(x);
1326 x = NULL;
1327 }
1328 }
1329
1330 if (!x)
1331 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332
1333 if (x == NULL)
1334 return -ENOENT;
1335
1336 min_spi = 0x100;
1337 max_spi = 0x0fffffff;
1338
1339 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340 if (range) {
1341 min_spi = range->sadb_spirange_min;
1342 max_spi = range->sadb_spirange_max;
1343 }
1344
1345 err = xfrm_alloc_spi(x, min_spi, max_spi);
1346 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1347
1348 if (IS_ERR(resp_skb)) {
1349 xfrm_state_put(x);
1350 return PTR_ERR(resp_skb);
1351 }
1352
1353 out_hdr = (struct sadb_msg *) resp_skb->data;
1354 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1355 out_hdr->sadb_msg_type = SADB_GETSPI;
1356 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1357 out_hdr->sadb_msg_errno = 0;
1358 out_hdr->sadb_msg_reserved = 0;
1359 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1360 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1361
1362 xfrm_state_put(x);
1363
1364 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1365
1366 return 0;
1367 }
1368
1369 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1370 {
1371 struct net *net = sock_net(sk);
1372 struct xfrm_state *x;
1373
1374 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1375 return -EOPNOTSUPP;
1376
1377 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1378 return 0;
1379
1380 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1381 if (x == NULL)
1382 return 0;
1383
1384 spin_lock_bh(&x->lock);
1385 if (x->km.state == XFRM_STATE_ACQ) {
1386 x->km.state = XFRM_STATE_ERROR;
1387 wake_up(&net->xfrm.km_waitq);
1388 }
1389 spin_unlock_bh(&x->lock);
1390 xfrm_state_put(x);
1391 return 0;
1392 }
1393
1394 static inline int event2poltype(int event)
1395 {
1396 switch (event) {
1397 case XFRM_MSG_DELPOLICY:
1398 return SADB_X_SPDDELETE;
1399 case XFRM_MSG_NEWPOLICY:
1400 return SADB_X_SPDADD;
1401 case XFRM_MSG_UPDPOLICY:
1402 return SADB_X_SPDUPDATE;
1403 case XFRM_MSG_POLEXPIRE:
1404 // return SADB_X_SPDEXPIRE;
1405 default:
1406 pr_err("pfkey: Unknown policy event %d\n", event);
1407 break;
1408 }
1409
1410 return 0;
1411 }
1412
1413 static inline int event2keytype(int event)
1414 {
1415 switch (event) {
1416 case XFRM_MSG_DELSA:
1417 return SADB_DELETE;
1418 case XFRM_MSG_NEWSA:
1419 return SADB_ADD;
1420 case XFRM_MSG_UPDSA:
1421 return SADB_UPDATE;
1422 case XFRM_MSG_EXPIRE:
1423 return SADB_EXPIRE;
1424 default:
1425 pr_err("pfkey: Unknown SA event %d\n", event);
1426 break;
1427 }
1428
1429 return 0;
1430 }
1431
1432 /* ADD/UPD/DEL */
1433 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1434 {
1435 struct sk_buff *skb;
1436 struct sadb_msg *hdr;
1437
1438 skb = pfkey_xfrm_state2msg(x);
1439
1440 if (IS_ERR(skb))
1441 return PTR_ERR(skb);
1442
1443 hdr = (struct sadb_msg *) skb->data;
1444 hdr->sadb_msg_version = PF_KEY_V2;
1445 hdr->sadb_msg_type = event2keytype(c->event);
1446 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1447 hdr->sadb_msg_errno = 0;
1448 hdr->sadb_msg_reserved = 0;
1449 hdr->sadb_msg_seq = c->seq;
1450 hdr->sadb_msg_pid = c->portid;
1451
1452 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1453
1454 return 0;
1455 }
1456
1457 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1458 {
1459 struct net *net = sock_net(sk);
1460 struct xfrm_state *x;
1461 int err;
1462 struct km_event c;
1463
1464 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1465 if (IS_ERR(x))
1466 return PTR_ERR(x);
1467
1468 xfrm_state_hold(x);
1469 if (hdr->sadb_msg_type == SADB_ADD)
1470 err = xfrm_state_add(x);
1471 else
1472 err = xfrm_state_update(x);
1473
1474 xfrm_audit_state_add(x, err ? 0 : 1,
1475 audit_get_loginuid(current),
1476 audit_get_sessionid(current), 0);
1477
1478 if (err < 0) {
1479 x->km.state = XFRM_STATE_DEAD;
1480 __xfrm_state_put(x);
1481 goto out;
1482 }
1483
1484 if (hdr->sadb_msg_type == SADB_ADD)
1485 c.event = XFRM_MSG_NEWSA;
1486 else
1487 c.event = XFRM_MSG_UPDSA;
1488 c.seq = hdr->sadb_msg_seq;
1489 c.portid = hdr->sadb_msg_pid;
1490 km_state_notify(x, &c);
1491 out:
1492 xfrm_state_put(x);
1493 return err;
1494 }
1495
1496 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498 struct net *net = sock_net(sk);
1499 struct xfrm_state *x;
1500 struct km_event c;
1501 int err;
1502
1503 if (!ext_hdrs[SADB_EXT_SA-1] ||
1504 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506 return -EINVAL;
1507
1508 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1509 if (x == NULL)
1510 return -ESRCH;
1511
1512 if ((err = security_xfrm_state_delete(x)))
1513 goto out;
1514
1515 if (xfrm_state_kern(x)) {
1516 err = -EPERM;
1517 goto out;
1518 }
1519
1520 err = xfrm_state_delete(x);
1521
1522 if (err < 0)
1523 goto out;
1524
1525 c.seq = hdr->sadb_msg_seq;
1526 c.portid = hdr->sadb_msg_pid;
1527 c.event = XFRM_MSG_DELSA;
1528 km_state_notify(x, &c);
1529 out:
1530 xfrm_audit_state_delete(x, err ? 0 : 1,
1531 audit_get_loginuid(current),
1532 audit_get_sessionid(current), 0);
1533 xfrm_state_put(x);
1534
1535 return err;
1536 }
1537
1538 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1539 {
1540 struct net *net = sock_net(sk);
1541 __u8 proto;
1542 struct sk_buff *out_skb;
1543 struct sadb_msg *out_hdr;
1544 struct xfrm_state *x;
1545
1546 if (!ext_hdrs[SADB_EXT_SA-1] ||
1547 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1548 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1549 return -EINVAL;
1550
1551 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1552 if (x == NULL)
1553 return -ESRCH;
1554
1555 out_skb = pfkey_xfrm_state2msg(x);
1556 proto = x->id.proto;
1557 xfrm_state_put(x);
1558 if (IS_ERR(out_skb))
1559 return PTR_ERR(out_skb);
1560
1561 out_hdr = (struct sadb_msg *) out_skb->data;
1562 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1563 out_hdr->sadb_msg_type = SADB_GET;
1564 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1565 out_hdr->sadb_msg_errno = 0;
1566 out_hdr->sadb_msg_reserved = 0;
1567 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1568 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1569 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1570
1571 return 0;
1572 }
1573
1574 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1575 gfp_t allocation)
1576 {
1577 struct sk_buff *skb;
1578 struct sadb_msg *hdr;
1579 int len, auth_len, enc_len, i;
1580
1581 auth_len = xfrm_count_auth_supported();
1582 if (auth_len) {
1583 auth_len *= sizeof(struct sadb_alg);
1584 auth_len += sizeof(struct sadb_supported);
1585 }
1586
1587 enc_len = xfrm_count_enc_supported();
1588 if (enc_len) {
1589 enc_len *= sizeof(struct sadb_alg);
1590 enc_len += sizeof(struct sadb_supported);
1591 }
1592
1593 len = enc_len + auth_len + sizeof(struct sadb_msg);
1594
1595 skb = alloc_skb(len + 16, allocation);
1596 if (!skb)
1597 goto out_put_algs;
1598
1599 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1600 pfkey_hdr_dup(hdr, orig);
1601 hdr->sadb_msg_errno = 0;
1602 hdr->sadb_msg_len = len / sizeof(uint64_t);
1603
1604 if (auth_len) {
1605 struct sadb_supported *sp;
1606 struct sadb_alg *ap;
1607
1608 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1609 ap = (struct sadb_alg *) (sp + 1);
1610
1611 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1612 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1613
1614 for (i = 0; ; i++) {
1615 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1616 if (!aalg)
1617 break;
1618 if (aalg->available)
1619 *ap++ = aalg->desc;
1620 }
1621 }
1622
1623 if (enc_len) {
1624 struct sadb_supported *sp;
1625 struct sadb_alg *ap;
1626
1627 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628 ap = (struct sadb_alg *) (sp + 1);
1629
1630 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632
1633 for (i = 0; ; i++) {
1634 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635 if (!ealg)
1636 break;
1637 if (ealg->available)
1638 *ap++ = ealg->desc;
1639 }
1640 }
1641
1642 out_put_algs:
1643 return skb;
1644 }
1645
1646 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1647 {
1648 struct pfkey_sock *pfk = pfkey_sk(sk);
1649 struct sk_buff *supp_skb;
1650
1651 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1652 return -EINVAL;
1653
1654 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1655 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1656 return -EEXIST;
1657 pfk->registered |= (1<<hdr->sadb_msg_satype);
1658 }
1659
1660 xfrm_probe_algs();
1661
1662 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1663 if (!supp_skb) {
1664 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1665 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1666
1667 return -ENOBUFS;
1668 }
1669
1670 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1671
1672 return 0;
1673 }
1674
1675 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1676 {
1677 struct sk_buff *skb;
1678 struct sadb_msg *hdr;
1679
1680 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1681 if (!skb)
1682 return -ENOBUFS;
1683
1684 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1685 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1686 hdr->sadb_msg_errno = (uint8_t) 0;
1687 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1688
1689 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1690 }
1691
1692 static int key_notify_sa_flush(const struct km_event *c)
1693 {
1694 struct sk_buff *skb;
1695 struct sadb_msg *hdr;
1696
1697 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1698 if (!skb)
1699 return -ENOBUFS;
1700 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1701 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1702 hdr->sadb_msg_type = SADB_FLUSH;
1703 hdr->sadb_msg_seq = c->seq;
1704 hdr->sadb_msg_pid = c->portid;
1705 hdr->sadb_msg_version = PF_KEY_V2;
1706 hdr->sadb_msg_errno = (uint8_t) 0;
1707 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1708
1709 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1710
1711 return 0;
1712 }
1713
1714 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1715 {
1716 struct net *net = sock_net(sk);
1717 unsigned int proto;
1718 struct km_event c;
1719 struct xfrm_audit audit_info;
1720 int err, err2;
1721
1722 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1723 if (proto == 0)
1724 return -EINVAL;
1725
1726 audit_info.loginuid = audit_get_loginuid(current);
1727 audit_info.sessionid = audit_get_sessionid(current);
1728 audit_info.secid = 0;
1729 err = xfrm_state_flush(net, proto, &audit_info);
1730 err2 = unicast_flush_resp(sk, hdr);
1731 if (err || err2) {
1732 if (err == -ESRCH) /* empty table - go quietly */
1733 err = 0;
1734 return err ? err : err2;
1735 }
1736
1737 c.data.proto = proto;
1738 c.seq = hdr->sadb_msg_seq;
1739 c.portid = hdr->sadb_msg_pid;
1740 c.event = XFRM_MSG_FLUSHSA;
1741 c.net = net;
1742 km_state_notify(NULL, &c);
1743
1744 return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749 struct pfkey_sock *pfk = ptr;
1750 struct sk_buff *out_skb;
1751 struct sadb_msg *out_hdr;
1752
1753 if (!pfkey_can_dump(&pfk->sk))
1754 return -ENOBUFS;
1755
1756 out_skb = pfkey_xfrm_state2msg(x);
1757 if (IS_ERR(out_skb))
1758 return PTR_ERR(out_skb);
1759
1760 out_hdr = (struct sadb_msg *) out_skb->data;
1761 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762 out_hdr->sadb_msg_type = SADB_DUMP;
1763 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764 out_hdr->sadb_msg_errno = 0;
1765 out_hdr->sadb_msg_reserved = 0;
1766 out_hdr->sadb_msg_seq = count + 1;
1767 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1768
1769 if (pfk->dump.skb)
1770 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1771 &pfk->sk, sock_net(&pfk->sk));
1772 pfk->dump.skb = out_skb;
1773
1774 return 0;
1775 }
1776
1777 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778 {
1779 struct net *net = sock_net(&pfk->sk);
1780 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781 }
1782
1783 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784 {
1785 xfrm_state_walk_done(&pfk->dump.u.state);
1786 }
1787
1788 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1789 {
1790 u8 proto;
1791 struct pfkey_sock *pfk = pfkey_sk(sk);
1792
1793 if (pfk->dump.dump != NULL)
1794 return -EBUSY;
1795
1796 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1797 if (proto == 0)
1798 return -EINVAL;
1799
1800 pfk->dump.msg_version = hdr->sadb_msg_version;
1801 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1802 pfk->dump.dump = pfkey_dump_sa;
1803 pfk->dump.done = pfkey_dump_sa_done;
1804 xfrm_state_walk_init(&pfk->dump.u.state, proto);
1805
1806 return pfkey_do_dump(pfk);
1807 }
1808
1809 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1810 {
1811 struct pfkey_sock *pfk = pfkey_sk(sk);
1812 int satype = hdr->sadb_msg_satype;
1813 bool reset_errno = false;
1814
1815 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1816 reset_errno = true;
1817 if (satype != 0 && satype != 1)
1818 return -EINVAL;
1819 pfk->promisc = satype;
1820 }
1821 if (reset_errno && skb_cloned(skb))
1822 skb = skb_copy(skb, GFP_KERNEL);
1823 else
1824 skb = skb_clone(skb, GFP_KERNEL);
1825
1826 if (reset_errno && skb) {
1827 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1828 new_hdr->sadb_msg_errno = 0;
1829 }
1830
1831 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1832 return 0;
1833 }
1834
1835 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1836 {
1837 int i;
1838 u32 reqid = *(u32*)ptr;
1839
1840 for (i=0; i<xp->xfrm_nr; i++) {
1841 if (xp->xfrm_vec[i].reqid == reqid)
1842 return -EEXIST;
1843 }
1844 return 0;
1845 }
1846
1847 static u32 gen_reqid(struct net *net)
1848 {
1849 struct xfrm_policy_walk walk;
1850 u32 start;
1851 int rc;
1852 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1853
1854 start = reqid;
1855 do {
1856 ++reqid;
1857 if (reqid == 0)
1858 reqid = IPSEC_MANUAL_REQID_MAX+1;
1859 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1860 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1861 xfrm_policy_walk_done(&walk);
1862 if (rc != -EEXIST)
1863 return reqid;
1864 } while (reqid != start);
1865 return 0;
1866 }
1867
1868 static int
1869 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1870 {
1871 struct net *net = xp_net(xp);
1872 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1873 int mode;
1874
1875 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1876 return -ELOOP;
1877
1878 if (rq->sadb_x_ipsecrequest_mode == 0)
1879 return -EINVAL;
1880
1881 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1882 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1883 return -EINVAL;
1884 t->mode = mode;
1885 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1886 t->optional = 1;
1887 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1888 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1889 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1890 t->reqid = 0;
1891 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1892 return -ENOBUFS;
1893 }
1894
1895 /* addresses present only in tunnel mode */
1896 if (t->mode == XFRM_MODE_TUNNEL) {
1897 u8 *sa = (u8 *) (rq + 1);
1898 int family, socklen;
1899
1900 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1901 &t->saddr);
1902 if (!family)
1903 return -EINVAL;
1904
1905 socklen = pfkey_sockaddr_len(family);
1906 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1907 &t->id.daddr) != family)
1908 return -EINVAL;
1909 t->encap_family = family;
1910 } else
1911 t->encap_family = xp->family;
1912
1913 /* No way to set this via kame pfkey */
1914 t->allalgs = 1;
1915 xp->xfrm_nr++;
1916 return 0;
1917 }
1918
1919 static int
1920 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1921 {
1922 int err;
1923 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1924 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1925
1926 while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1927 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1928 return err;
1929 len -= rq->sadb_x_ipsecrequest_len;
1930 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1931 }
1932 return 0;
1933 }
1934
1935 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1936 {
1937 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1938
1939 if (xfrm_ctx) {
1940 int len = sizeof(struct sadb_x_sec_ctx);
1941 len += xfrm_ctx->ctx_len;
1942 return PFKEY_ALIGN8(len);
1943 }
1944 return 0;
1945 }
1946
1947 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1948 {
1949 const struct xfrm_tmpl *t;
1950 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1951 int socklen = 0;
1952 int i;
1953
1954 for (i=0; i<xp->xfrm_nr; i++) {
1955 t = xp->xfrm_vec + i;
1956 socklen += pfkey_sockaddr_len(t->encap_family);
1957 }
1958
1959 return sizeof(struct sadb_msg) +
1960 (sizeof(struct sadb_lifetime) * 3) +
1961 (sizeof(struct sadb_address) * 2) +
1962 (sockaddr_size * 2) +
1963 sizeof(struct sadb_x_policy) +
1964 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1965 (socklen * 2) +
1966 pfkey_xfrm_policy2sec_ctx_size(xp);
1967 }
1968
1969 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1970 {
1971 struct sk_buff *skb;
1972 int size;
1973
1974 size = pfkey_xfrm_policy2msg_size(xp);
1975
1976 skb = alloc_skb(size + 16, GFP_ATOMIC);
1977 if (skb == NULL)
1978 return ERR_PTR(-ENOBUFS);
1979
1980 return skb;
1981 }
1982
1983 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1984 {
1985 struct sadb_msg *hdr;
1986 struct sadb_address *addr;
1987 struct sadb_lifetime *lifetime;
1988 struct sadb_x_policy *pol;
1989 struct sadb_x_sec_ctx *sec_ctx;
1990 struct xfrm_sec_ctx *xfrm_ctx;
1991 int i;
1992 int size;
1993 int sockaddr_size = pfkey_sockaddr_size(xp->family);
1994 int socklen = pfkey_sockaddr_len(xp->family);
1995
1996 size = pfkey_xfrm_policy2msg_size(xp);
1997
1998 /* call should fill header later */
1999 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2000 memset(hdr, 0, size); /* XXX do we need this ? */
2001
2002 /* src address */
2003 addr = (struct sadb_address*) skb_put(skb,
2004 sizeof(struct sadb_address)+sockaddr_size);
2005 addr->sadb_address_len =
2006 (sizeof(struct sadb_address)+sockaddr_size)/
2007 sizeof(uint64_t);
2008 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2009 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2010 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2011 addr->sadb_address_reserved = 0;
2012 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2013 xp->selector.sport,
2014 (struct sockaddr *) (addr + 1),
2015 xp->family))
2016 BUG();
2017
2018 /* dst address */
2019 addr = (struct sadb_address*) skb_put(skb,
2020 sizeof(struct sadb_address)+sockaddr_size);
2021 addr->sadb_address_len =
2022 (sizeof(struct sadb_address)+sockaddr_size)/
2023 sizeof(uint64_t);
2024 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2025 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2026 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2027 addr->sadb_address_reserved = 0;
2028
2029 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2030 (struct sockaddr *) (addr + 1),
2031 xp->family);
2032
2033 /* hard time */
2034 lifetime = (struct sadb_lifetime *) skb_put(skb,
2035 sizeof(struct sadb_lifetime));
2036 lifetime->sadb_lifetime_len =
2037 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2038 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2039 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2040 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2041 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2042 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2043 /* soft time */
2044 lifetime = (struct sadb_lifetime *) skb_put(skb,
2045 sizeof(struct sadb_lifetime));
2046 lifetime->sadb_lifetime_len =
2047 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2048 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2049 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2050 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2051 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2052 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2053 /* current time */
2054 lifetime = (struct sadb_lifetime *) skb_put(skb,
2055 sizeof(struct sadb_lifetime));
2056 lifetime->sadb_lifetime_len =
2057 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2058 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2059 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2060 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2061 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2062 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2063
2064 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2065 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2066 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2067 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2068 if (xp->action == XFRM_POLICY_ALLOW) {
2069 if (xp->xfrm_nr)
2070 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2071 else
2072 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2073 }
2074 pol->sadb_x_policy_dir = dir+1;
2075 pol->sadb_x_policy_id = xp->index;
2076 pol->sadb_x_policy_priority = xp->priority;
2077
2078 for (i=0; i<xp->xfrm_nr; i++) {
2079 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2080 struct sadb_x_ipsecrequest *rq;
2081 int req_size;
2082 int mode;
2083
2084 req_size = sizeof(struct sadb_x_ipsecrequest);
2085 if (t->mode == XFRM_MODE_TUNNEL) {
2086 socklen = pfkey_sockaddr_len(t->encap_family);
2087 req_size += socklen * 2;
2088 } else {
2089 size -= 2*socklen;
2090 }
2091 rq = (void*)skb_put(skb, req_size);
2092 pol->sadb_x_policy_len += req_size/8;
2093 memset(rq, 0, sizeof(*rq));
2094 rq->sadb_x_ipsecrequest_len = req_size;
2095 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2096 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2097 return -EINVAL;
2098 rq->sadb_x_ipsecrequest_mode = mode;
2099 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2100 if (t->reqid)
2101 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2102 if (t->optional)
2103 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2104 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2105
2106 if (t->mode == XFRM_MODE_TUNNEL) {
2107 u8 *sa = (void *)(rq + 1);
2108 pfkey_sockaddr_fill(&t->saddr, 0,
2109 (struct sockaddr *)sa,
2110 t->encap_family);
2111 pfkey_sockaddr_fill(&t->id.daddr, 0,
2112 (struct sockaddr *) (sa + socklen),
2113 t->encap_family);
2114 }
2115 }
2116
2117 /* security context */
2118 if ((xfrm_ctx = xp->security)) {
2119 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2120
2121 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2122 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2123 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2124 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2125 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2126 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2127 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2128 xfrm_ctx->ctx_len);
2129 }
2130
2131 hdr->sadb_msg_len = size / sizeof(uint64_t);
2132 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2133
2134 return 0;
2135 }
2136
2137 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2138 {
2139 struct sk_buff *out_skb;
2140 struct sadb_msg *out_hdr;
2141 int err;
2142
2143 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2144 if (IS_ERR(out_skb))
2145 return PTR_ERR(out_skb);
2146
2147 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2148 if (err < 0)
2149 return err;
2150
2151 out_hdr = (struct sadb_msg *) out_skb->data;
2152 out_hdr->sadb_msg_version = PF_KEY_V2;
2153
2154 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2155 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2156 else
2157 out_hdr->sadb_msg_type = event2poltype(c->event);
2158 out_hdr->sadb_msg_errno = 0;
2159 out_hdr->sadb_msg_seq = c->seq;
2160 out_hdr->sadb_msg_pid = c->portid;
2161 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2162 return 0;
2163
2164 }
2165
2166 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2167 {
2168 struct net *net = sock_net(sk);
2169 int err = 0;
2170 struct sadb_lifetime *lifetime;
2171 struct sadb_address *sa;
2172 struct sadb_x_policy *pol;
2173 struct xfrm_policy *xp;
2174 struct km_event c;
2175 struct sadb_x_sec_ctx *sec_ctx;
2176
2177 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2178 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2179 !ext_hdrs[SADB_X_EXT_POLICY-1])
2180 return -EINVAL;
2181
2182 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2183 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2184 return -EINVAL;
2185 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2186 return -EINVAL;
2187
2188 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2189 if (xp == NULL)
2190 return -ENOBUFS;
2191
2192 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2193 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2194 xp->priority = pol->sadb_x_policy_priority;
2195
2196 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2197 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2198 if (!xp->family) {
2199 err = -EINVAL;
2200 goto out;
2201 }
2202 xp->selector.family = xp->family;
2203 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2204 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2205 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2206 if (xp->selector.sport)
2207 xp->selector.sport_mask = htons(0xffff);
2208
2209 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2210 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2211 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2212
2213 /* Amusing, we set this twice. KAME apps appear to set same value
2214 * in both addresses.
2215 */
2216 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2217
2218 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2219 if (xp->selector.dport)
2220 xp->selector.dport_mask = htons(0xffff);
2221
2222 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2223 if (sec_ctx != NULL) {
2224 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2225
2226 if (!uctx) {
2227 err = -ENOBUFS;
2228 goto out;
2229 }
2230
2231 err = security_xfrm_policy_alloc(&xp->security, uctx);
2232 kfree(uctx);
2233
2234 if (err)
2235 goto out;
2236 }
2237
2238 xp->lft.soft_byte_limit = XFRM_INF;
2239 xp->lft.hard_byte_limit = XFRM_INF;
2240 xp->lft.soft_packet_limit = XFRM_INF;
2241 xp->lft.hard_packet_limit = XFRM_INF;
2242 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2243 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2244 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2245 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2246 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2247 }
2248 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2249 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2250 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2251 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2252 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2253 }
2254 xp->xfrm_nr = 0;
2255 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2256 (err = parse_ipsecrequests(xp, pol)) < 0)
2257 goto out;
2258
2259 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2260 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2261
2262 xfrm_audit_policy_add(xp, err ? 0 : 1,
2263 audit_get_loginuid(current),
2264 audit_get_sessionid(current), 0);
2265
2266 if (err)
2267 goto out;
2268
2269 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2270 c.event = XFRM_MSG_UPDPOLICY;
2271 else
2272 c.event = XFRM_MSG_NEWPOLICY;
2273
2274 c.seq = hdr->sadb_msg_seq;
2275 c.portid = hdr->sadb_msg_pid;
2276
2277 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2278 xfrm_pol_put(xp);
2279 return 0;
2280
2281 out:
2282 xp->walk.dead = 1;
2283 xfrm_policy_destroy(xp);
2284 return err;
2285 }
2286
2287 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2288 {
2289 struct net *net = sock_net(sk);
2290 int err;
2291 struct sadb_address *sa;
2292 struct sadb_x_policy *pol;
2293 struct xfrm_policy *xp;
2294 struct xfrm_selector sel;
2295 struct km_event c;
2296 struct sadb_x_sec_ctx *sec_ctx;
2297 struct xfrm_sec_ctx *pol_ctx = NULL;
2298
2299 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2300 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2301 !ext_hdrs[SADB_X_EXT_POLICY-1])
2302 return -EINVAL;
2303
2304 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2305 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2306 return -EINVAL;
2307
2308 memset(&sel, 0, sizeof(sel));
2309
2310 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2311 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2312 sel.prefixlen_s = sa->sadb_address_prefixlen;
2313 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2314 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2315 if (sel.sport)
2316 sel.sport_mask = htons(0xffff);
2317
2318 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2319 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2320 sel.prefixlen_d = sa->sadb_address_prefixlen;
2321 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2322 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2323 if (sel.dport)
2324 sel.dport_mask = htons(0xffff);
2325
2326 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2327 if (sec_ctx != NULL) {
2328 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2329
2330 if (!uctx)
2331 return -ENOMEM;
2332
2333 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2334 kfree(uctx);
2335 if (err)
2336 return err;
2337 }
2338
2339 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2340 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2341 1, &err);
2342 security_xfrm_policy_free(pol_ctx);
2343 if (xp == NULL)
2344 return -ENOENT;
2345
2346 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2347 audit_get_loginuid(current),
2348 audit_get_sessionid(current), 0);
2349
2350 if (err)
2351 goto out;
2352
2353 c.seq = hdr->sadb_msg_seq;
2354 c.portid = hdr->sadb_msg_pid;
2355 c.data.byid = 0;
2356 c.event = XFRM_MSG_DELPOLICY;
2357 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2358
2359 out:
2360 xfrm_pol_put(xp);
2361 return err;
2362 }
2363
2364 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2365 {
2366 int err;
2367 struct sk_buff *out_skb;
2368 struct sadb_msg *out_hdr;
2369 err = 0;
2370
2371 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2372 if (IS_ERR(out_skb)) {
2373 err = PTR_ERR(out_skb);
2374 goto out;
2375 }
2376 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2377 if (err < 0)
2378 goto out;
2379
2380 out_hdr = (struct sadb_msg *) out_skb->data;
2381 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2382 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2383 out_hdr->sadb_msg_satype = 0;
2384 out_hdr->sadb_msg_errno = 0;
2385 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2386 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2387 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2388 err = 0;
2389
2390 out:
2391 return err;
2392 }
2393
2394 #ifdef CONFIG_NET_KEY_MIGRATE
2395 static int pfkey_sockaddr_pair_size(sa_family_t family)
2396 {
2397 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2398 }
2399
2400 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2401 xfrm_address_t *saddr, xfrm_address_t *daddr,
2402 u16 *family)
2403 {
2404 int af, socklen;
2405
2406 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2407 return -EINVAL;
2408
2409 af = pfkey_sockaddr_extract(sa, saddr);
2410 if (!af)
2411 return -EINVAL;
2412
2413 socklen = pfkey_sockaddr_len(af);
2414 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2415 daddr) != af)
2416 return -EINVAL;
2417
2418 *family = af;
2419 return 0;
2420 }
2421
2422 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2423 struct xfrm_migrate *m)
2424 {
2425 int err;
2426 struct sadb_x_ipsecrequest *rq2;
2427 int mode;
2428
2429 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2430 len < rq1->sadb_x_ipsecrequest_len)
2431 return -EINVAL;
2432
2433 /* old endoints */
2434 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2435 rq1->sadb_x_ipsecrequest_len,
2436 &m->old_saddr, &m->old_daddr,
2437 &m->old_family);
2438 if (err)
2439 return err;
2440
2441 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2442 len -= rq1->sadb_x_ipsecrequest_len;
2443
2444 if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2445 len < rq2->sadb_x_ipsecrequest_len)
2446 return -EINVAL;
2447
2448 /* new endpoints */
2449 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2450 rq2->sadb_x_ipsecrequest_len,
2451 &m->new_saddr, &m->new_daddr,
2452 &m->new_family);
2453 if (err)
2454 return err;
2455
2456 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2457 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2458 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2459 return -EINVAL;
2460
2461 m->proto = rq1->sadb_x_ipsecrequest_proto;
2462 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2463 return -EINVAL;
2464 m->mode = mode;
2465 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2466
2467 return ((int)(rq1->sadb_x_ipsecrequest_len +
2468 rq2->sadb_x_ipsecrequest_len));
2469 }
2470
2471 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2472 const struct sadb_msg *hdr, void * const *ext_hdrs)
2473 {
2474 int i, len, ret, err = -EINVAL;
2475 u8 dir;
2476 struct sadb_address *sa;
2477 struct sadb_x_kmaddress *kma;
2478 struct sadb_x_policy *pol;
2479 struct sadb_x_ipsecrequest *rq;
2480 struct xfrm_selector sel;
2481 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2482 struct xfrm_kmaddress k;
2483
2484 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2485 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2486 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2487 err = -EINVAL;
2488 goto out;
2489 }
2490
2491 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2492 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2493
2494 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2495 err = -EINVAL;
2496 goto out;
2497 }
2498
2499 if (kma) {
2500 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2501 k.reserved = kma->sadb_x_kmaddress_reserved;
2502 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2503 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2504 &k.local, &k.remote, &k.family);
2505 if (ret < 0) {
2506 err = ret;
2507 goto out;
2508 }
2509 }
2510
2511 dir = pol->sadb_x_policy_dir - 1;
2512 memset(&sel, 0, sizeof(sel));
2513
2514 /* set source address info of selector */
2515 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2516 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2517 sel.prefixlen_s = sa->sadb_address_prefixlen;
2518 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2519 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2520 if (sel.sport)
2521 sel.sport_mask = htons(0xffff);
2522
2523 /* set destination address info of selector */
2524 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2525 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2526 sel.prefixlen_d = sa->sadb_address_prefixlen;
2527 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2528 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2529 if (sel.dport)
2530 sel.dport_mask = htons(0xffff);
2531
2532 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2533
2534 /* extract ipsecrequests */
2535 i = 0;
2536 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2537
2538 while (len > 0 && i < XFRM_MAX_DEPTH) {
2539 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2540 if (ret < 0) {
2541 err = ret;
2542 goto out;
2543 } else {
2544 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2545 len -= ret;
2546 i++;
2547 }
2548 }
2549
2550 if (!i || len > 0) {
2551 err = -EINVAL;
2552 goto out;
2553 }
2554
2555 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2556 kma ? &k : NULL);
2557
2558 out:
2559 return err;
2560 }
2561 #else
2562 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2563 const struct sadb_msg *hdr, void * const *ext_hdrs)
2564 {
2565 return -ENOPROTOOPT;
2566 }
2567 #endif
2568
2569
2570 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2571 {
2572 struct net *net = sock_net(sk);
2573 unsigned int dir;
2574 int err = 0, delete;
2575 struct sadb_x_policy *pol;
2576 struct xfrm_policy *xp;
2577 struct km_event c;
2578
2579 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2580 return -EINVAL;
2581
2582 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2583 if (dir >= XFRM_POLICY_MAX)
2584 return -EINVAL;
2585
2586 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2587 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2588 dir, pol->sadb_x_policy_id, delete, &err);
2589 if (xp == NULL)
2590 return -ENOENT;
2591
2592 if (delete) {
2593 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2594 audit_get_loginuid(current),
2595 audit_get_sessionid(current), 0);
2596
2597 if (err)
2598 goto out;
2599 c.seq = hdr->sadb_msg_seq;
2600 c.portid = hdr->sadb_msg_pid;
2601 c.data.byid = 1;
2602 c.event = XFRM_MSG_DELPOLICY;
2603 km_policy_notify(xp, dir, &c);
2604 } else {
2605 err = key_pol_get_resp(sk, xp, hdr, dir);
2606 }
2607
2608 out:
2609 xfrm_pol_put(xp);
2610 return err;
2611 }
2612
2613 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2614 {
2615 struct pfkey_sock *pfk = ptr;
2616 struct sk_buff *out_skb;
2617 struct sadb_msg *out_hdr;
2618 int err;
2619
2620 if (!pfkey_can_dump(&pfk->sk))
2621 return -ENOBUFS;
2622
2623 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2624 if (IS_ERR(out_skb))
2625 return PTR_ERR(out_skb);
2626
2627 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2628 if (err < 0)
2629 return err;
2630
2631 out_hdr = (struct sadb_msg *) out_skb->data;
2632 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2633 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2634 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2635 out_hdr->sadb_msg_errno = 0;
2636 out_hdr->sadb_msg_seq = count + 1;
2637 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2638
2639 if (pfk->dump.skb)
2640 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2641 &pfk->sk, sock_net(&pfk->sk));
2642 pfk->dump.skb = out_skb;
2643
2644 return 0;
2645 }
2646
2647 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2648 {
2649 struct net *net = sock_net(&pfk->sk);
2650 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2651 }
2652
2653 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2654 {
2655 xfrm_policy_walk_done(&pfk->dump.u.policy);
2656 }
2657
2658 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2659 {
2660 struct pfkey_sock *pfk = pfkey_sk(sk);
2661
2662 if (pfk->dump.dump != NULL)
2663 return -EBUSY;
2664
2665 pfk->dump.msg_version = hdr->sadb_msg_version;
2666 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2667 pfk->dump.dump = pfkey_dump_sp;
2668 pfk->dump.done = pfkey_dump_sp_done;
2669 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2670
2671 return pfkey_do_dump(pfk);
2672 }
2673
2674 static int key_notify_policy_flush(const struct km_event *c)
2675 {
2676 struct sk_buff *skb_out;
2677 struct sadb_msg *hdr;
2678
2679 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2680 if (!skb_out)
2681 return -ENOBUFS;
2682 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2683 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2684 hdr->sadb_msg_seq = c->seq;
2685 hdr->sadb_msg_pid = c->portid;
2686 hdr->sadb_msg_version = PF_KEY_V2;
2687 hdr->sadb_msg_errno = (uint8_t) 0;
2688 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2689 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2690 return 0;
2691
2692 }
2693
2694 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2695 {
2696 struct net *net = sock_net(sk);
2697 struct km_event c;
2698 struct xfrm_audit audit_info;
2699 int err, err2;
2700
2701 audit_info.loginuid = audit_get_loginuid(current);
2702 audit_info.sessionid = audit_get_sessionid(current);
2703 audit_info.secid = 0;
2704 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2705 err2 = unicast_flush_resp(sk, hdr);
2706 if (err || err2) {
2707 if (err == -ESRCH) /* empty table - old silent behavior */
2708 return 0;
2709 return err;
2710 }
2711
2712 c.data.type = XFRM_POLICY_TYPE_MAIN;
2713 c.event = XFRM_MSG_FLUSHPOLICY;
2714 c.portid = hdr->sadb_msg_pid;
2715 c.seq = hdr->sadb_msg_seq;
2716 c.net = net;
2717 km_policy_notify(NULL, 0, &c);
2718
2719 return 0;
2720 }
2721
2722 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2723 const struct sadb_msg *hdr, void * const *ext_hdrs);
2724 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2725 [SADB_RESERVED] = pfkey_reserved,
2726 [SADB_GETSPI] = pfkey_getspi,
2727 [SADB_UPDATE] = pfkey_add,
2728 [SADB_ADD] = pfkey_add,
2729 [SADB_DELETE] = pfkey_delete,
2730 [SADB_GET] = pfkey_get,
2731 [SADB_ACQUIRE] = pfkey_acquire,
2732 [SADB_REGISTER] = pfkey_register,
2733 [SADB_EXPIRE] = NULL,
2734 [SADB_FLUSH] = pfkey_flush,
2735 [SADB_DUMP] = pfkey_dump,
2736 [SADB_X_PROMISC] = pfkey_promisc,
2737 [SADB_X_PCHANGE] = NULL,
2738 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2739 [SADB_X_SPDADD] = pfkey_spdadd,
2740 [SADB_X_SPDDELETE] = pfkey_spddelete,
2741 [SADB_X_SPDGET] = pfkey_spdget,
2742 [SADB_X_SPDACQUIRE] = NULL,
2743 [SADB_X_SPDDUMP] = pfkey_spddump,
2744 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2745 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2746 [SADB_X_SPDDELETE2] = pfkey_spdget,
2747 [SADB_X_MIGRATE] = pfkey_migrate,
2748 };
2749
2750 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2751 {
2752 void *ext_hdrs[SADB_EXT_MAX];
2753 int err;
2754
2755 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2756 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2757
2758 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2759 err = parse_exthdrs(skb, hdr, ext_hdrs);
2760 if (!err) {
2761 err = -EOPNOTSUPP;
2762 if (pfkey_funcs[hdr->sadb_msg_type])
2763 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2764 }
2765 return err;
2766 }
2767
2768 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2769 {
2770 struct sadb_msg *hdr = NULL;
2771
2772 if (skb->len < sizeof(*hdr)) {
2773 *errp = -EMSGSIZE;
2774 } else {
2775 hdr = (struct sadb_msg *) skb->data;
2776 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2777 hdr->sadb_msg_reserved != 0 ||
2778 (hdr->sadb_msg_type <= SADB_RESERVED ||
2779 hdr->sadb_msg_type > SADB_MAX)) {
2780 hdr = NULL;
2781 *errp = -EINVAL;
2782 } else if (hdr->sadb_msg_len != (skb->len /
2783 sizeof(uint64_t)) ||
2784 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2785 sizeof(uint64_t))) {
2786 hdr = NULL;
2787 *errp = -EMSGSIZE;
2788 } else {
2789 *errp = 0;
2790 }
2791 }
2792 return hdr;
2793 }
2794
2795 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2796 const struct xfrm_algo_desc *d)
2797 {
2798 unsigned int id = d->desc.sadb_alg_id;
2799
2800 if (id >= sizeof(t->aalgos) * 8)
2801 return 0;
2802
2803 return (t->aalgos >> id) & 1;
2804 }
2805
2806 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2807 const struct xfrm_algo_desc *d)
2808 {
2809 unsigned int id = d->desc.sadb_alg_id;
2810
2811 if (id >= sizeof(t->ealgos) * 8)
2812 return 0;
2813
2814 return (t->ealgos >> id) & 1;
2815 }
2816
2817 static int count_ah_combs(const struct xfrm_tmpl *t)
2818 {
2819 int i, sz = 0;
2820
2821 for (i = 0; ; i++) {
2822 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2823 if (!aalg)
2824 break;
2825 if (aalg_tmpl_set(t, aalg) && aalg->available)
2826 sz += sizeof(struct sadb_comb);
2827 }
2828 return sz + sizeof(struct sadb_prop);
2829 }
2830
2831 static int count_esp_combs(const struct xfrm_tmpl *t)
2832 {
2833 int i, k, sz = 0;
2834
2835 for (i = 0; ; i++) {
2836 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2837 if (!ealg)
2838 break;
2839
2840 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2841 continue;
2842
2843 for (k = 1; ; k++) {
2844 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2845 if (!aalg)
2846 break;
2847
2848 if (aalg_tmpl_set(t, aalg) && aalg->available)
2849 sz += sizeof(struct sadb_comb);
2850 }
2851 }
2852 return sz + sizeof(struct sadb_prop);
2853 }
2854
2855 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2856 {
2857 struct sadb_prop *p;
2858 int i;
2859
2860 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2861 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2862 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2863 p->sadb_prop_replay = 32;
2864 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2865
2866 for (i = 0; ; i++) {
2867 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2868 if (!aalg)
2869 break;
2870
2871 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2872 struct sadb_comb *c;
2873 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2874 memset(c, 0, sizeof(*c));
2875 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2876 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2877 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2878 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2879 c->sadb_comb_hard_addtime = 24*60*60;
2880 c->sadb_comb_soft_addtime = 20*60*60;
2881 c->sadb_comb_hard_usetime = 8*60*60;
2882 c->sadb_comb_soft_usetime = 7*60*60;
2883 }
2884 }
2885 }
2886
2887 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2888 {
2889 struct sadb_prop *p;
2890 int i, k;
2891
2892 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2893 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2894 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2895 p->sadb_prop_replay = 32;
2896 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2897
2898 for (i=0; ; i++) {
2899 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2900 if (!ealg)
2901 break;
2902
2903 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2904 continue;
2905
2906 for (k = 1; ; k++) {
2907 struct sadb_comb *c;
2908 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2909 if (!aalg)
2910 break;
2911 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2912 continue;
2913 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2914 memset(c, 0, sizeof(*c));
2915 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2916 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2917 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2918 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2919 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2920 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2921 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2922 c->sadb_comb_hard_addtime = 24*60*60;
2923 c->sadb_comb_soft_addtime = 20*60*60;
2924 c->sadb_comb_hard_usetime = 8*60*60;
2925 c->sadb_comb_soft_usetime = 7*60*60;
2926 }
2927 }
2928 }
2929
2930 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2931 {
2932 return 0;
2933 }
2934
2935 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2936 {
2937 struct sk_buff *out_skb;
2938 struct sadb_msg *out_hdr;
2939 int hard;
2940 int hsc;
2941
2942 hard = c->data.hard;
2943 if (hard)
2944 hsc = 2;
2945 else
2946 hsc = 1;
2947
2948 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2949 if (IS_ERR(out_skb))
2950 return PTR_ERR(out_skb);
2951
2952 out_hdr = (struct sadb_msg *) out_skb->data;
2953 out_hdr->sadb_msg_version = PF_KEY_V2;
2954 out_hdr->sadb_msg_type = SADB_EXPIRE;
2955 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2956 out_hdr->sadb_msg_errno = 0;
2957 out_hdr->sadb_msg_reserved = 0;
2958 out_hdr->sadb_msg_seq = 0;
2959 out_hdr->sadb_msg_pid = 0;
2960
2961 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2962 return 0;
2963 }
2964
2965 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2966 {
2967 struct net *net = x ? xs_net(x) : c->net;
2968 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2969
2970 if (atomic_read(&net_pfkey->socks_nr) == 0)
2971 return 0;
2972
2973 switch (c->event) {
2974 case XFRM_MSG_EXPIRE:
2975 return key_notify_sa_expire(x, c);
2976 case XFRM_MSG_DELSA:
2977 case XFRM_MSG_NEWSA:
2978 case XFRM_MSG_UPDSA:
2979 return key_notify_sa(x, c);
2980 case XFRM_MSG_FLUSHSA:
2981 return key_notify_sa_flush(c);
2982 case XFRM_MSG_NEWAE: /* not yet supported */
2983 break;
2984 default:
2985 pr_err("pfkey: Unknown SA event %d\n", c->event);
2986 break;
2987 }
2988
2989 return 0;
2990 }
2991
2992 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2993 {
2994 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2995 return 0;
2996
2997 switch (c->event) {
2998 case XFRM_MSG_POLEXPIRE:
2999 return key_notify_policy_expire(xp, c);
3000 case XFRM_MSG_DELPOLICY:
3001 case XFRM_MSG_NEWPOLICY:
3002 case XFRM_MSG_UPDPOLICY:
3003 return key_notify_policy(xp, dir, c);
3004 case XFRM_MSG_FLUSHPOLICY:
3005 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3006 break;
3007 return key_notify_policy_flush(c);
3008 default:
3009 pr_err("pfkey: Unknown policy event %d\n", c->event);
3010 break;
3011 }
3012
3013 return 0;
3014 }
3015
3016 static u32 get_acqseq(void)
3017 {
3018 u32 res;
3019 static atomic_t acqseq;
3020
3021 do {
3022 res = atomic_inc_return(&acqseq);
3023 } while (!res);
3024 return res;
3025 }
3026
3027 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3028 {
3029 struct sk_buff *skb;
3030 struct sadb_msg *hdr;
3031 struct sadb_address *addr;
3032 struct sadb_x_policy *pol;
3033 int sockaddr_size;
3034 int size;
3035 struct sadb_x_sec_ctx *sec_ctx;
3036 struct xfrm_sec_ctx *xfrm_ctx;
3037 int ctx_size = 0;
3038
3039 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3040 if (!sockaddr_size)
3041 return -EINVAL;
3042
3043 size = sizeof(struct sadb_msg) +
3044 (sizeof(struct sadb_address) * 2) +
3045 (sockaddr_size * 2) +
3046 sizeof(struct sadb_x_policy);
3047
3048 if (x->id.proto == IPPROTO_AH)
3049 size += count_ah_combs(t);
3050 else if (x->id.proto == IPPROTO_ESP)
3051 size += count_esp_combs(t);
3052
3053 if ((xfrm_ctx = x->security)) {
3054 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3055 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3056 }
3057
3058 skb = alloc_skb(size + 16, GFP_ATOMIC);
3059 if (skb == NULL)
3060 return -ENOMEM;
3061
3062 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3063 hdr->sadb_msg_version = PF_KEY_V2;
3064 hdr->sadb_msg_type = SADB_ACQUIRE;
3065 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3066 hdr->sadb_msg_len = size / sizeof(uint64_t);
3067 hdr->sadb_msg_errno = 0;
3068 hdr->sadb_msg_reserved = 0;
3069 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3070 hdr->sadb_msg_pid = 0;
3071
3072 /* src address */
3073 addr = (struct sadb_address*) skb_put(skb,
3074 sizeof(struct sadb_address)+sockaddr_size);
3075 addr->sadb_address_len =
3076 (sizeof(struct sadb_address)+sockaddr_size)/
3077 sizeof(uint64_t);
3078 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3079 addr->sadb_address_proto = 0;
3080 addr->sadb_address_reserved = 0;
3081 addr->sadb_address_prefixlen =
3082 pfkey_sockaddr_fill(&x->props.saddr, 0,
3083 (struct sockaddr *) (addr + 1),
3084 x->props.family);
3085 if (!addr->sadb_address_prefixlen)
3086 BUG();
3087
3088 /* dst address */
3089 addr = (struct sadb_address*) skb_put(skb,
3090 sizeof(struct sadb_address)+sockaddr_size);
3091 addr->sadb_address_len =
3092 (sizeof(struct sadb_address)+sockaddr_size)/
3093 sizeof(uint64_t);
3094 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3095 addr->sadb_address_proto = 0;
3096 addr->sadb_address_reserved = 0;
3097 addr->sadb_address_prefixlen =
3098 pfkey_sockaddr_fill(&x->id.daddr, 0,
3099 (struct sockaddr *) (addr + 1),
3100 x->props.family);
3101 if (!addr->sadb_address_prefixlen)
3102 BUG();
3103
3104 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3105 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3106 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3107 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3108 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3109 pol->sadb_x_policy_id = xp->index;
3110
3111 /* Set sadb_comb's. */
3112 if (x->id.proto == IPPROTO_AH)
3113 dump_ah_combs(skb, t);
3114 else if (x->id.proto == IPPROTO_ESP)
3115 dump_esp_combs(skb, t);
3116
3117 /* security context */
3118 if (xfrm_ctx) {
3119 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3120 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3121 sec_ctx->sadb_x_sec_len =
3122 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3123 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3124 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3125 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3126 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3127 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3128 xfrm_ctx->ctx_len);
3129 }
3130
3131 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3132 }
3133
3134 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3135 u8 *data, int len, int *dir)
3136 {
3137 struct net *net = sock_net(sk);
3138 struct xfrm_policy *xp;
3139 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3140 struct sadb_x_sec_ctx *sec_ctx;
3141
3142 switch (sk->sk_family) {
3143 case AF_INET:
3144 if (opt != IP_IPSEC_POLICY) {
3145 *dir = -EOPNOTSUPP;
3146 return NULL;
3147 }
3148 break;
3149 #if IS_ENABLED(CONFIG_IPV6)
3150 case AF_INET6:
3151 if (opt != IPV6_IPSEC_POLICY) {
3152 *dir = -EOPNOTSUPP;
3153 return NULL;
3154 }
3155 break;
3156 #endif
3157 default:
3158 *dir = -EINVAL;
3159 return NULL;
3160 }
3161
3162 *dir = -EINVAL;
3163
3164 if (len < sizeof(struct sadb_x_policy) ||
3165 pol->sadb_x_policy_len*8 > len ||
3166 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3167 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3168 return NULL;
3169
3170 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3171 if (xp == NULL) {
3172 *dir = -ENOBUFS;
3173 return NULL;
3174 }
3175
3176 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3177 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3178
3179 xp->lft.soft_byte_limit = XFRM_INF;
3180 xp->lft.hard_byte_limit = XFRM_INF;
3181 xp->lft.soft_packet_limit = XFRM_INF;
3182 xp->lft.hard_packet_limit = XFRM_INF;
3183 xp->family = sk->sk_family;
3184
3185 xp->xfrm_nr = 0;
3186 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3187 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3188 goto out;
3189
3190 /* security context too */
3191 if (len >= (pol->sadb_x_policy_len*8 +
3192 sizeof(struct sadb_x_sec_ctx))) {
3193 char *p = (char *)pol;
3194 struct xfrm_user_sec_ctx *uctx;
3195
3196 p += pol->sadb_x_policy_len*8;
3197 sec_ctx = (struct sadb_x_sec_ctx *)p;
3198 if (len < pol->sadb_x_policy_len*8 +
3199 sec_ctx->sadb_x_sec_len) {
3200 *dir = -EINVAL;
3201 goto out;
3202 }
3203 if ((*dir = verify_sec_ctx_len(p)))
3204 goto out;
3205 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3206 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3207 kfree(uctx);
3208
3209 if (*dir)
3210 goto out;
3211 }
3212
3213 *dir = pol->sadb_x_policy_dir-1;
3214 return xp;
3215
3216 out:
3217 xp->walk.dead = 1;
3218 xfrm_policy_destroy(xp);
3219 return NULL;
3220 }
3221
3222 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3223 {
3224 struct sk_buff *skb;
3225 struct sadb_msg *hdr;
3226 struct sadb_sa *sa;
3227 struct sadb_address *addr;
3228 struct sadb_x_nat_t_port *n_port;
3229 int sockaddr_size;
3230 int size;
3231 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3232 struct xfrm_encap_tmpl *natt = NULL;
3233
3234 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3235 if (!sockaddr_size)
3236 return -EINVAL;
3237
3238 if (!satype)
3239 return -EINVAL;
3240
3241 if (!x->encap)
3242 return -EINVAL;
3243
3244 natt = x->encap;
3245
3246 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3247 *
3248 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3249 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3250 */
3251
3252 size = sizeof(struct sadb_msg) +
3253 sizeof(struct sadb_sa) +
3254 (sizeof(struct sadb_address) * 2) +
3255 (sockaddr_size * 2) +
3256 (sizeof(struct sadb_x_nat_t_port) * 2);
3257
3258 skb = alloc_skb(size + 16, GFP_ATOMIC);
3259 if (skb == NULL)
3260 return -ENOMEM;
3261
3262 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3263 hdr->sadb_msg_version = PF_KEY_V2;
3264 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3265 hdr->sadb_msg_satype = satype;
3266 hdr->sadb_msg_len = size / sizeof(uint64_t);
3267 hdr->sadb_msg_errno = 0;
3268 hdr->sadb_msg_reserved = 0;
3269 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3270 hdr->sadb_msg_pid = 0;
3271
3272 /* SA */
3273 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3274 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3275 sa->sadb_sa_exttype = SADB_EXT_SA;
3276 sa->sadb_sa_spi = x->id.spi;
3277 sa->sadb_sa_replay = 0;
3278 sa->sadb_sa_state = 0;
3279 sa->sadb_sa_auth = 0;
3280 sa->sadb_sa_encrypt = 0;
3281 sa->sadb_sa_flags = 0;
3282
3283 /* ADDRESS_SRC (old addr) */
3284 addr = (struct sadb_address*)
3285 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3286 addr->sadb_address_len =
3287 (sizeof(struct sadb_address)+sockaddr_size)/
3288 sizeof(uint64_t);
3289 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3290 addr->sadb_address_proto = 0;
3291 addr->sadb_address_reserved = 0;
3292 addr->sadb_address_prefixlen =
3293 pfkey_sockaddr_fill(&x->props.saddr, 0,
3294 (struct sockaddr *) (addr + 1),
3295 x->props.family);
3296 if (!addr->sadb_address_prefixlen)
3297 BUG();
3298
3299 /* NAT_T_SPORT (old port) */
3300 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3301 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3302 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3303 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3304 n_port->sadb_x_nat_t_port_reserved = 0;
3305
3306 /* ADDRESS_DST (new addr) */
3307 addr = (struct sadb_address*)
3308 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3309 addr->sadb_address_len =
3310 (sizeof(struct sadb_address)+sockaddr_size)/
3311 sizeof(uint64_t);
3312 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3313 addr->sadb_address_proto = 0;
3314 addr->sadb_address_reserved = 0;
3315 addr->sadb_address_prefixlen =
3316 pfkey_sockaddr_fill(ipaddr, 0,
3317 (struct sockaddr *) (addr + 1),
3318 x->props.family);
3319 if (!addr->sadb_address_prefixlen)
3320 BUG();
3321
3322 /* NAT_T_DPORT (new port) */
3323 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3324 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3325 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3326 n_port->sadb_x_nat_t_port_port = sport;
3327 n_port->sadb_x_nat_t_port_reserved = 0;
3328
3329 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3330 }
3331
3332 #ifdef CONFIG_NET_KEY_MIGRATE
3333 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3334 const struct xfrm_selector *sel)
3335 {
3336 struct sadb_address *addr;
3337 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3338 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3339 addr->sadb_address_exttype = type;
3340 addr->sadb_address_proto = sel->proto;
3341 addr->sadb_address_reserved = 0;
3342
3343 switch (type) {
3344 case SADB_EXT_ADDRESS_SRC:
3345 addr->sadb_address_prefixlen = sel->prefixlen_s;
3346 pfkey_sockaddr_fill(&sel->saddr, 0,
3347 (struct sockaddr *)(addr + 1),
3348 sel->family);
3349 break;
3350 case SADB_EXT_ADDRESS_DST:
3351 addr->sadb_address_prefixlen = sel->prefixlen_d;
3352 pfkey_sockaddr_fill(&sel->daddr, 0,
3353 (struct sockaddr *)(addr + 1),
3354 sel->family);
3355 break;
3356 default:
3357 return -EINVAL;
3358 }
3359
3360 return 0;
3361 }
3362
3363
3364 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3365 {
3366 struct sadb_x_kmaddress *kma;
3367 u8 *sa;
3368 int family = k->family;
3369 int socklen = pfkey_sockaddr_len(family);
3370 int size_req;
3371
3372 size_req = (sizeof(struct sadb_x_kmaddress) +
3373 pfkey_sockaddr_pair_size(family));
3374
3375 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3376 memset(kma, 0, size_req);
3377 kma->sadb_x_kmaddress_len = size_req / 8;
3378 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3379 kma->sadb_x_kmaddress_reserved = k->reserved;
3380
3381 sa = (u8 *)(kma + 1);
3382 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3383 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3384 return -EINVAL;
3385
3386 return 0;
3387 }
3388
3389 static int set_ipsecrequest(struct sk_buff *skb,
3390 uint8_t proto, uint8_t mode, int level,
3391 uint32_t reqid, uint8_t family,
3392 const xfrm_address_t *src, const xfrm_address_t *dst)
3393 {
3394 struct sadb_x_ipsecrequest *rq;
3395 u8 *sa;
3396 int socklen = pfkey_sockaddr_len(family);
3397 int size_req;
3398
3399 size_req = sizeof(struct sadb_x_ipsecrequest) +
3400 pfkey_sockaddr_pair_size(family);
3401
3402 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3403 memset(rq, 0, size_req);
3404 rq->sadb_x_ipsecrequest_len = size_req;
3405 rq->sadb_x_ipsecrequest_proto = proto;
3406 rq->sadb_x_ipsecrequest_mode = mode;
3407 rq->sadb_x_ipsecrequest_level = level;
3408 rq->sadb_x_ipsecrequest_reqid = reqid;
3409
3410 sa = (u8 *) (rq + 1);
3411 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3412 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3413 return -EINVAL;
3414
3415 return 0;
3416 }
3417 #endif
3418
3419 #ifdef CONFIG_NET_KEY_MIGRATE
3420 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3421 const struct xfrm_migrate *m, int num_bundles,
3422 const struct xfrm_kmaddress *k)
3423 {
3424 int i;
3425 int sasize_sel;
3426 int size = 0;
3427 int size_pol = 0;
3428 struct sk_buff *skb;
3429 struct sadb_msg *hdr;
3430 struct sadb_x_policy *pol;
3431 const struct xfrm_migrate *mp;
3432
3433 if (type != XFRM_POLICY_TYPE_MAIN)
3434 return 0;
3435
3436 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3437 return -EINVAL;
3438
3439 if (k != NULL) {
3440 /* addresses for KM */
3441 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3442 pfkey_sockaddr_pair_size(k->family));
3443 }
3444
3445 /* selector */
3446 sasize_sel = pfkey_sockaddr_size(sel->family);
3447 if (!sasize_sel)
3448 return -EINVAL;
3449 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3450
3451 /* policy info */
3452 size_pol += sizeof(struct sadb_x_policy);
3453
3454 /* ipsecrequests */
3455 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3456 /* old locator pair */
3457 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3458 pfkey_sockaddr_pair_size(mp->old_family);
3459 /* new locator pair */
3460 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3461 pfkey_sockaddr_pair_size(mp->new_family);
3462 }
3463
3464 size += sizeof(struct sadb_msg) + size_pol;
3465
3466 /* alloc buffer */
3467 skb = alloc_skb(size, GFP_ATOMIC);
3468 if (skb == NULL)
3469 return -ENOMEM;
3470
3471 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3472 hdr->sadb_msg_version = PF_KEY_V2;
3473 hdr->sadb_msg_type = SADB_X_MIGRATE;
3474 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3475 hdr->sadb_msg_len = size / 8;
3476 hdr->sadb_msg_errno = 0;
3477 hdr->sadb_msg_reserved = 0;
3478 hdr->sadb_msg_seq = 0;
3479 hdr->sadb_msg_pid = 0;
3480
3481 /* Addresses to be used by KM for negotiation, if ext is available */
3482 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3483 goto err;
3484
3485 /* selector src */
3486 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3487
3488 /* selector dst */
3489 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3490
3491 /* policy information */
3492 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3493 pol->sadb_x_policy_len = size_pol / 8;
3494 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3495 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3496 pol->sadb_x_policy_dir = dir + 1;
3497 pol->sadb_x_policy_id = 0;
3498 pol->sadb_x_policy_priority = 0;
3499
3500 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3501 /* old ipsecrequest */
3502 int mode = pfkey_mode_from_xfrm(mp->mode);
3503 if (mode < 0)
3504 goto err;
3505 if (set_ipsecrequest(skb, mp->proto, mode,
3506 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3507 mp->reqid, mp->old_family,
3508 &mp->old_saddr, &mp->old_daddr) < 0)
3509 goto err;
3510
3511 /* new ipsecrequest */
3512 if (set_ipsecrequest(skb, mp->proto, mode,
3513 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3514 mp->reqid, mp->new_family,
3515 &mp->new_saddr, &mp->new_daddr) < 0)
3516 goto err;
3517 }
3518
3519 /* broadcast migrate message to sockets */
3520 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3521
3522 return 0;
3523
3524 err:
3525 kfree_skb(skb);
3526 return -EINVAL;
3527 }
3528 #else
3529 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3530 const struct xfrm_migrate *m, int num_bundles,
3531 const struct xfrm_kmaddress *k)
3532 {
3533 return -ENOPROTOOPT;
3534 }
3535 #endif
3536
3537 static int pfkey_sendmsg(struct kiocb *kiocb,
3538 struct socket *sock, struct msghdr *msg, size_t len)
3539 {
3540 struct sock *sk = sock->sk;
3541 struct sk_buff *skb = NULL;
3542 struct sadb_msg *hdr = NULL;
3543 int err;
3544
3545 err = -EOPNOTSUPP;
3546 if (msg->msg_flags & MSG_OOB)
3547 goto out;
3548
3549 err = -EMSGSIZE;
3550 if ((unsigned int)len > sk->sk_sndbuf - 32)
3551 goto out;
3552
3553 err = -ENOBUFS;
3554 skb = alloc_skb(len, GFP_KERNEL);
3555 if (skb == NULL)
3556 goto out;
3557
3558 err = -EFAULT;
3559 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3560 goto out;
3561
3562 hdr = pfkey_get_base_msg(skb, &err);
3563 if (!hdr)
3564 goto out;
3565
3566 mutex_lock(&xfrm_cfg_mutex);
3567 err = pfkey_process(sk, skb, hdr);
3568 mutex_unlock(&xfrm_cfg_mutex);
3569
3570 out:
3571 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3572 err = 0;
3573 kfree_skb(skb);
3574
3575 return err ? : len;
3576 }
3577
3578 static int pfkey_recvmsg(struct kiocb *kiocb,
3579 struct socket *sock, struct msghdr *msg, size_t len,
3580 int flags)
3581 {
3582 struct sock *sk = sock->sk;
3583 struct pfkey_sock *pfk = pfkey_sk(sk);
3584 struct sk_buff *skb;
3585 int copied, err;
3586
3587 err = -EINVAL;
3588 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3589 goto out;
3590
3591 msg->msg_namelen = 0;
3592 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3593 if (skb == NULL)
3594 goto out;
3595
3596 copied = skb->len;
3597 if (copied > len) {
3598 msg->msg_flags |= MSG_TRUNC;
3599 copied = len;
3600 }
3601
3602 skb_reset_transport_header(skb);
3603 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3604 if (err)
3605 goto out_free;
3606
3607 sock_recv_ts_and_drops(msg, sk, skb);
3608
3609 err = (flags & MSG_TRUNC) ? skb->len : copied;
3610
3611 if (pfk->dump.dump != NULL &&
3612 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3613 pfkey_do_dump(pfk);
3614
3615 out_free:
3616 skb_free_datagram(sk, skb);
3617 out:
3618 return err;
3619 }
3620
3621 static const struct proto_ops pfkey_ops = {
3622 .family = PF_KEY,
3623 .owner = THIS_MODULE,
3624 /* Operations that make no sense on pfkey sockets. */
3625 .bind = sock_no_bind,
3626 .connect = sock_no_connect,
3627 .socketpair = sock_no_socketpair,
3628 .accept = sock_no_accept,
3629 .getname = sock_no_getname,
3630 .ioctl = sock_no_ioctl,
3631 .listen = sock_no_listen,
3632 .shutdown = sock_no_shutdown,
3633 .setsockopt = sock_no_setsockopt,
3634 .getsockopt = sock_no_getsockopt,
3635 .mmap = sock_no_mmap,
3636 .sendpage = sock_no_sendpage,
3637
3638 /* Now the operations that really occur. */
3639 .release = pfkey_release,
3640 .poll = datagram_poll,
3641 .sendmsg = pfkey_sendmsg,
3642 .recvmsg = pfkey_recvmsg,
3643 };
3644
3645 static const struct net_proto_family pfkey_family_ops = {
3646 .family = PF_KEY,
3647 .create = pfkey_create,
3648 .owner = THIS_MODULE,
3649 };
3650
3651 #ifdef CONFIG_PROC_FS
3652 static int pfkey_seq_show(struct seq_file *f, void *v)
3653 {
3654 struct sock *s = sk_entry(v);
3655
3656 if (v == SEQ_START_TOKEN)
3657 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3658 else
3659 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3660 s,
3661 atomic_read(&s->sk_refcnt),
3662 sk_rmem_alloc_get(s),
3663 sk_wmem_alloc_get(s),
3664 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3665 sock_i_ino(s)
3666 );
3667 return 0;
3668 }
3669
3670 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3671 __acquires(rcu)
3672 {
3673 struct net *net = seq_file_net(f);
3674 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3675
3676 rcu_read_lock();
3677 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3678 }
3679
3680 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3681 {
3682 struct net *net = seq_file_net(f);
3683 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3684
3685 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3686 }
3687
3688 static void pfkey_seq_stop(struct seq_file *f, void *v)
3689 __releases(rcu)
3690 {
3691 rcu_read_unlock();
3692 }
3693
3694 static const struct seq_operations pfkey_seq_ops = {
3695 .start = pfkey_seq_start,
3696 .next = pfkey_seq_next,
3697 .stop = pfkey_seq_stop,
3698 .show = pfkey_seq_show,
3699 };
3700
3701 static int pfkey_seq_open(struct inode *inode, struct file *file)
3702 {
3703 return seq_open_net(inode, file, &pfkey_seq_ops,
3704 sizeof(struct seq_net_private));
3705 }
3706
3707 static const struct file_operations pfkey_proc_ops = {
3708 .open = pfkey_seq_open,
3709 .read = seq_read,
3710 .llseek = seq_lseek,
3711 .release = seq_release_net,
3712 };
3713
3714 static int __net_init pfkey_init_proc(struct net *net)
3715 {
3716 struct proc_dir_entry *e;
3717
3718 e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3719 if (e == NULL)
3720 return -ENOMEM;
3721
3722 return 0;
3723 }
3724
3725 static void __net_exit pfkey_exit_proc(struct net *net)
3726 {
3727 proc_net_remove(net, "pfkey");
3728 }
3729 #else
3730 static inline int pfkey_init_proc(struct net *net)
3731 {
3732 return 0;
3733 }
3734
3735 static inline void pfkey_exit_proc(struct net *net)
3736 {
3737 }
3738 #endif
3739
3740 static struct xfrm_mgr pfkeyv2_mgr =
3741 {
3742 .id = "pfkeyv2",
3743 .notify = pfkey_send_notify,
3744 .acquire = pfkey_send_acquire,
3745 .compile_policy = pfkey_compile_policy,
3746 .new_mapping = pfkey_send_new_mapping,
3747 .notify_policy = pfkey_send_policy_notify,
3748 .migrate = pfkey_send_migrate,
3749 };
3750
3751 static int __net_init pfkey_net_init(struct net *net)
3752 {
3753 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3754 int rv;
3755
3756 INIT_HLIST_HEAD(&net_pfkey->table);
3757 atomic_set(&net_pfkey->socks_nr, 0);
3758
3759 rv = pfkey_init_proc(net);
3760
3761 return rv;
3762 }
3763
3764 static void __net_exit pfkey_net_exit(struct net *net)
3765 {
3766 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3767
3768 pfkey_exit_proc(net);
3769 BUG_ON(!hlist_empty(&net_pfkey->table));
3770 }
3771
3772 static struct pernet_operations pfkey_net_ops = {
3773 .init = pfkey_net_init,
3774 .exit = pfkey_net_exit,
3775 .id = &pfkey_net_id,
3776 .size = sizeof(struct netns_pfkey),
3777 };
3778
3779 static void __exit ipsec_pfkey_exit(void)
3780 {
3781 xfrm_unregister_km(&pfkeyv2_mgr);
3782 sock_unregister(PF_KEY);
3783 unregister_pernet_subsys(&pfkey_net_ops);
3784 proto_unregister(&key_proto);
3785 }
3786
3787 static int __init ipsec_pfkey_init(void)
3788 {
3789 int err = proto_register(&key_proto, 0);
3790
3791 if (err != 0)
3792 goto out;
3793
3794 err = register_pernet_subsys(&pfkey_net_ops);
3795 if (err != 0)
3796 goto out_unregister_key_proto;
3797 err = sock_register(&pfkey_family_ops);
3798 if (err != 0)
3799 goto out_unregister_pernet;
3800 err = xfrm_register_km(&pfkeyv2_mgr);
3801 if (err != 0)
3802 goto out_sock_unregister;
3803 out:
3804 return err;
3805
3806 out_sock_unregister:
3807 sock_unregister(PF_KEY);
3808 out_unregister_pernet:
3809 unregister_pernet_subsys(&pfkey_net_ops);
3810 out_unregister_key_proto:
3811 proto_unregister(&key_proto);
3812 goto out;
3813 }
3814
3815 module_init(ipsec_pfkey_init);
3816 module_exit(ipsec_pfkey_exit);
3817 MODULE_LICENSE("GPL");
3818 MODULE_ALIAS_NETPROTO(PF_KEY);
kernel source for telekom puls (alcatel/mediatek)