1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
4 *
5 * Authors: Maxim Giryaev <gem@asplinux.ru>
6 * David S. Miller <davem@redhat.com>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
10 * Derek Atkins <derek@ihtfp.com>
11 */
12
13 #include <linux/capability.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/socket.h>
17 #include <linux/pfkeyv2.h>
18 #include <linux/ipsec.h>
19 #include <linux/skbuff.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/in.h>
22 #include <linux/in6.h>
23 #include <linux/proc_fs.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <net/net_namespace.h>
27 #include <net/netns/generic.h>
28 #include <net/xfrm.h>
29
30 #include <net/sock.h>
31
32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
34
35 static unsigned int pfkey_net_id __read_mostly;
36 struct netns_pfkey {
37 /* List of all pfkey sockets. */
38 struct hlist_head table;
39 atomic_t socks_nr;
40 };
41 static DEFINE_MUTEX(pfkey_mutex);
42
43 #define DUMMY_MARK 0
44 static const struct xfrm_mark dummy_mark = {0, 0};
45 struct pfkey_sock {
46 /* struct sock must be the first member of struct pfkey_sock */
47 struct sock sk;
48 int registered;
49 int promisc;
50
51 struct {
52 uint8_t msg_version;
53 uint32_t msg_portid;
54 int (*dump)(struct pfkey_sock *sk);
55 void (*done)(struct pfkey_sock *sk);
56 union {
57 struct xfrm_policy_walk policy;
58 struct xfrm_state_walk state;
59 } u;
60 struct sk_buff *skb;
61 } dump;
62 struct mutex dump_lock;
63 };
64
65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
66 xfrm_address_t *saddr, xfrm_address_t *daddr,
67 u16 *family);
68
pfkey_sk(struct sock * sk)69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70 {
71 return (struct pfkey_sock *)sk;
72 }
73
pfkey_can_dump(const struct sock * sk)74 static int pfkey_can_dump(const struct sock *sk)
75 {
76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
77 return 1;
78 return 0;
79 }
80
pfkey_terminate_dump(struct pfkey_sock * pfk)81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
82 {
83 if (pfk->dump.dump) {
84 if (pfk->dump.skb) {
85 kfree_skb(pfk->dump.skb);
86 pfk->dump.skb = NULL;
87 }
88 pfk->dump.done(pfk);
89 pfk->dump.dump = NULL;
90 pfk->dump.done = NULL;
91 }
92 }
93
pfkey_sock_destruct(struct sock * sk)94 static void pfkey_sock_destruct(struct sock *sk)
95 {
96 struct net *net = sock_net(sk);
97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
98
99 pfkey_terminate_dump(pfkey_sk(sk));
100 skb_queue_purge(&sk->sk_receive_queue);
101
102 if (!sock_flag(sk, SOCK_DEAD)) {
103 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
104 return;
105 }
106
107 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
108 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
109
110 atomic_dec(&net_pfkey->socks_nr);
111 }
112
113 static const struct proto_ops pfkey_ops;
114
pfkey_insert(struct sock * sk)115 static void pfkey_insert(struct sock *sk)
116 {
117 struct net *net = sock_net(sk);
118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
119
120 mutex_lock(&pfkey_mutex);
121 sk_add_node_rcu(sk, &net_pfkey->table);
122 mutex_unlock(&pfkey_mutex);
123 }
124
pfkey_remove(struct sock * sk)125 static void pfkey_remove(struct sock *sk)
126 {
127 mutex_lock(&pfkey_mutex);
128 sk_del_node_init_rcu(sk);
129 mutex_unlock(&pfkey_mutex);
130 }
131
132 static struct proto key_proto = {
133 .name = "KEY",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct pfkey_sock),
136 };
137
pfkey_create(struct net * net,struct socket * sock,int protocol,int kern)138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
139 int kern)
140 {
141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
142 struct sock *sk;
143 struct pfkey_sock *pfk;
144 int err;
145
146 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
147 return -EPERM;
148 if (sock->type != SOCK_RAW)
149 return -ESOCKTNOSUPPORT;
150 if (protocol != PF_KEY_V2)
151 return -EPROTONOSUPPORT;
152
153 err = -ENOMEM;
154 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
155 if (sk == NULL)
156 goto out;
157
158 pfk = pfkey_sk(sk);
159 mutex_init(&pfk->dump_lock);
160
161 sock->ops = &pfkey_ops;
162 sock_init_data(sock, sk);
163
164 sk->sk_family = PF_KEY;
165 sk->sk_destruct = pfkey_sock_destruct;
166
167 atomic_inc(&net_pfkey->socks_nr);
168
169 pfkey_insert(sk);
170
171 return 0;
172 out:
173 return err;
174 }
175
pfkey_release(struct socket * sock)176 static int pfkey_release(struct socket *sock)
177 {
178 struct sock *sk = sock->sk;
179
180 if (!sk)
181 return 0;
182
183 pfkey_remove(sk);
184
185 sock_orphan(sk);
186 sock->sk = NULL;
187 skb_queue_purge(&sk->sk_write_queue);
188
189 synchronize_rcu();
190 sock_put(sk);
191
192 return 0;
193 }
194
pfkey_broadcast_one(struct sk_buff * skb,gfp_t allocation,struct sock * sk)195 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
196 struct sock *sk)
197 {
198 int err = -ENOBUFS;
199
200 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
201 return err;
202
203 skb = skb_clone(skb, allocation);
204
205 if (skb) {
206 skb_set_owner_r(skb, sk);
207 skb_queue_tail(&sk->sk_receive_queue, skb);
208 sk->sk_data_ready(sk);
209 err = 0;
210 }
211 return err;
212 }
213
214 /* Send SKB to all pfkey sockets matching selected criteria. */
215 #define BROADCAST_ALL 0
216 #define BROADCAST_ONE 1
217 #define BROADCAST_REGISTERED 2
218 #define BROADCAST_PROMISC_ONLY 4
pfkey_broadcast(struct sk_buff * skb,gfp_t allocation,int broadcast_flags,struct sock * one_sk,struct net * net)219 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
220 int broadcast_flags, struct sock *one_sk,
221 struct net *net)
222 {
223 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
224 struct sock *sk;
225 int err = -ESRCH;
226
227 /* XXX Do we need something like netlink_overrun? I think
228 * XXX PF_KEY socket apps will not mind current behavior.
229 */
230 if (!skb)
231 return -ENOMEM;
232
233 rcu_read_lock();
234 sk_for_each_rcu(sk, &net_pfkey->table) {
235 struct pfkey_sock *pfk = pfkey_sk(sk);
236 int err2;
237
238 /* Yes, it means that if you are meant to receive this
239 * pfkey message you receive it twice as promiscuous
240 * socket.
241 */
242 if (pfk->promisc)
243 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
244
245 /* the exact target will be processed later */
246 if (sk == one_sk)
247 continue;
248 if (broadcast_flags != BROADCAST_ALL) {
249 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
250 continue;
251 if ((broadcast_flags & BROADCAST_REGISTERED) &&
252 !pfk->registered)
253 continue;
254 if (broadcast_flags & BROADCAST_ONE)
255 continue;
256 }
257
258 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
259
260 /* Error is cleared after successful sending to at least one
261 * registered KM */
262 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
263 err = err2;
264 }
265 rcu_read_unlock();
266
267 if (one_sk != NULL)
268 err = pfkey_broadcast_one(skb, allocation, one_sk);
269
270 kfree_skb(skb);
271 return err;
272 }
273
pfkey_do_dump(struct pfkey_sock * pfk)274 static int pfkey_do_dump(struct pfkey_sock *pfk)
275 {
276 struct sadb_msg *hdr;
277 int rc;
278
279 mutex_lock(&pfk->dump_lock);
280 if (!pfk->dump.dump) {
281 rc = 0;
282 goto out;
283 }
284
285 rc = pfk->dump.dump(pfk);
286 if (rc == -ENOBUFS) {
287 rc = 0;
288 goto out;
289 }
290
291 if (pfk->dump.skb) {
292 if (!pfkey_can_dump(&pfk->sk)) {
293 rc = 0;
294 goto out;
295 }
296
297 hdr = (struct sadb_msg *) pfk->dump.skb->data;
298 hdr->sadb_msg_seq = 0;
299 hdr->sadb_msg_errno = rc;
300 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
301 &pfk->sk, sock_net(&pfk->sk));
302 pfk->dump.skb = NULL;
303 }
304
305 pfkey_terminate_dump(pfk);
306
307 out:
308 mutex_unlock(&pfk->dump_lock);
309 return rc;
310 }
311
pfkey_hdr_dup(struct sadb_msg * new,const struct sadb_msg * orig)312 static inline void pfkey_hdr_dup(struct sadb_msg *new,
313 const struct sadb_msg *orig)
314 {
315 *new = *orig;
316 }
317
pfkey_error(const struct sadb_msg * orig,int err,struct sock * sk)318 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
319 {
320 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
321 struct sadb_msg *hdr;
322
323 if (!skb)
324 return -ENOBUFS;
325
326 /* Woe be to the platform trying to support PFKEY yet
327 * having normal errnos outside the 1-255 range, inclusive.
328 */
329 err = -err;
330 if (err == ERESTARTSYS ||
331 err == ERESTARTNOHAND ||
332 err == ERESTARTNOINTR)
333 err = EINTR;
334 if (err >= 512)
335 err = EINVAL;
336 BUG_ON(err <= 0 || err >= 256);
337
338 hdr = skb_put(skb, sizeof(struct sadb_msg));
339 pfkey_hdr_dup(hdr, orig);
340 hdr->sadb_msg_errno = (uint8_t) err;
341 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
342 sizeof(uint64_t));
343
344 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
345
346 return 0;
347 }
348
349 static const u8 sadb_ext_min_len[] = {
350 [SADB_EXT_RESERVED] = (u8) 0,
351 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
352 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
353 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
354 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
355 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
356 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
357 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
358 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
359 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
360 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
361 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
362 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
363 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
364 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
365 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
366 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
367 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
368 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
369 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
370 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
371 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
372 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
373 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
374 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
375 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
376 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
377 };
378
379 /* Verify sadb_address_{len,prefixlen} against sa_family. */
verify_address_len(const void * p)380 static int verify_address_len(const void *p)
381 {
382 const struct sadb_address *sp = p;
383 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
384 const struct sockaddr_in *sin;
385 #if IS_ENABLED(CONFIG_IPV6)
386 const struct sockaddr_in6 *sin6;
387 #endif
388 int len;
389
390 if (sp->sadb_address_len <
391 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
392 sizeof(uint64_t)))
393 return -EINVAL;
394
395 switch (addr->sa_family) {
396 case AF_INET:
397 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
398 if (sp->sadb_address_len != len ||
399 sp->sadb_address_prefixlen > 32)
400 return -EINVAL;
401 break;
402 #if IS_ENABLED(CONFIG_IPV6)
403 case AF_INET6:
404 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
405 if (sp->sadb_address_len != len ||
406 sp->sadb_address_prefixlen > 128)
407 return -EINVAL;
408 break;
409 #endif
410 default:
411 /* It is user using kernel to keep track of security
412 * associations for another protocol, such as
413 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
414 * lengths.
415 *
416 * XXX Actually, association/policy database is not yet
417 * XXX able to cope with arbitrary sockaddr families.
418 * XXX When it can, remove this -EINVAL. -DaveM
419 */
420 return -EINVAL;
421 }
422
423 return 0;
424 }
425
sadb_key_len(const struct sadb_key * key)426 static inline int sadb_key_len(const struct sadb_key *key)
427 {
428 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
429
430 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
431 sizeof(uint64_t));
432 }
433
verify_key_len(const void * p)434 static int verify_key_len(const void *p)
435 {
436 const struct sadb_key *key = p;
437
438 if (sadb_key_len(key) > key->sadb_key_len)
439 return -EINVAL;
440
441 return 0;
442 }
443
pfkey_sec_ctx_len(const struct sadb_x_sec_ctx * sec_ctx)444 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
445 {
446 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
447 sec_ctx->sadb_x_ctx_len,
448 sizeof(uint64_t));
449 }
450
verify_sec_ctx_len(const void * p)451 static inline int verify_sec_ctx_len(const void *p)
452 {
453 const struct sadb_x_sec_ctx *sec_ctx = p;
454 int len = sec_ctx->sadb_x_ctx_len;
455
456 if (len > PAGE_SIZE)
457 return -EINVAL;
458
459 len = pfkey_sec_ctx_len(sec_ctx);
460
461 if (sec_ctx->sadb_x_sec_len != len)
462 return -EINVAL;
463
464 return 0;
465 }
466
pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx * sec_ctx,gfp_t gfp)467 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
468 gfp_t gfp)
469 {
470 struct xfrm_user_sec_ctx *uctx = NULL;
471 int ctx_size = sec_ctx->sadb_x_ctx_len;
472
473 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
474
475 if (!uctx)
476 return NULL;
477
478 uctx->len = pfkey_sec_ctx_len(sec_ctx);
479 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
480 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
481 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
482 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
483 memcpy(uctx + 1, sec_ctx + 1,
484 uctx->ctx_len);
485
486 return uctx;
487 }
488
present_and_same_family(const struct sadb_address * src,const struct sadb_address * dst)489 static int present_and_same_family(const struct sadb_address *src,
490 const struct sadb_address *dst)
491 {
492 const struct sockaddr *s_addr, *d_addr;
493
494 if (!src || !dst)
495 return 0;
496
497 s_addr = (const struct sockaddr *)(src + 1);
498 d_addr = (const struct sockaddr *)(dst + 1);
499 if (s_addr->sa_family != d_addr->sa_family)
500 return 0;
501 if (s_addr->sa_family != AF_INET
502 #if IS_ENABLED(CONFIG_IPV6)
503 && s_addr->sa_family != AF_INET6
504 #endif
505 )
506 return 0;
507
508 return 1;
509 }
510
parse_exthdrs(struct sk_buff * skb,const struct sadb_msg * hdr,void ** ext_hdrs)511 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
512 {
513 const char *p = (char *) hdr;
514 int len = skb->len;
515
516 len -= sizeof(*hdr);
517 p += sizeof(*hdr);
518 while (len > 0) {
519 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
520 uint16_t ext_type;
521 int ext_len;
522
523 if (len < sizeof(*ehdr))
524 return -EINVAL;
525
526 ext_len = ehdr->sadb_ext_len;
527 ext_len *= sizeof(uint64_t);
528 ext_type = ehdr->sadb_ext_type;
529 if (ext_len < sizeof(uint64_t) ||
530 ext_len > len ||
531 ext_type == SADB_EXT_RESERVED)
532 return -EINVAL;
533
534 if (ext_type <= SADB_EXT_MAX) {
535 int min = (int) sadb_ext_min_len[ext_type];
536 if (ext_len < min)
537 return -EINVAL;
538 if (ext_hdrs[ext_type-1] != NULL)
539 return -EINVAL;
540 switch (ext_type) {
541 case SADB_EXT_ADDRESS_SRC:
542 case SADB_EXT_ADDRESS_DST:
543 case SADB_EXT_ADDRESS_PROXY:
544 case SADB_X_EXT_NAT_T_OA:
545 if (verify_address_len(p))
546 return -EINVAL;
547 break;
548 case SADB_X_EXT_SEC_CTX:
549 if (verify_sec_ctx_len(p))
550 return -EINVAL;
551 break;
552 case SADB_EXT_KEY_AUTH:
553 case SADB_EXT_KEY_ENCRYPT:
554 if (verify_key_len(p))
555 return -EINVAL;
556 break;
557 default:
558 break;
559 }
560 ext_hdrs[ext_type-1] = (void *) p;
561 }
562 p += ext_len;
563 len -= ext_len;
564 }
565
566 return 0;
567 }
568
569 static uint16_t
pfkey_satype2proto(uint8_t satype)570 pfkey_satype2proto(uint8_t satype)
571 {
572 switch (satype) {
573 case SADB_SATYPE_UNSPEC:
574 return IPSEC_PROTO_ANY;
575 case SADB_SATYPE_AH:
576 return IPPROTO_AH;
577 case SADB_SATYPE_ESP:
578 return IPPROTO_ESP;
579 case SADB_X_SATYPE_IPCOMP:
580 return IPPROTO_COMP;
581 default:
582 return 0;
583 }
584 /* NOTREACHED */
585 }
586
587 static uint8_t
pfkey_proto2satype(uint16_t proto)588 pfkey_proto2satype(uint16_t proto)
589 {
590 switch (proto) {
591 case IPPROTO_AH:
592 return SADB_SATYPE_AH;
593 case IPPROTO_ESP:
594 return SADB_SATYPE_ESP;
595 case IPPROTO_COMP:
596 return SADB_X_SATYPE_IPCOMP;
597 default:
598 return 0;
599 }
600 /* NOTREACHED */
601 }
602
603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
604 * say specifically 'just raw sockets' as we encode them as 255.
605 */
606
pfkey_proto_to_xfrm(uint8_t proto)607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
608 {
609 return proto == IPSEC_PROTO_ANY ? 0 : proto;
610 }
611
pfkey_proto_from_xfrm(uint8_t proto)612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
613 {
614 return proto ? proto : IPSEC_PROTO_ANY;
615 }
616
pfkey_sockaddr_len(sa_family_t family)617 static inline int pfkey_sockaddr_len(sa_family_t family)
618 {
619 switch (family) {
620 case AF_INET:
621 return sizeof(struct sockaddr_in);
622 #if IS_ENABLED(CONFIG_IPV6)
623 case AF_INET6:
624 return sizeof(struct sockaddr_in6);
625 #endif
626 }
627 return 0;
628 }
629
630 static
pfkey_sockaddr_extract(const struct sockaddr * sa,xfrm_address_t * xaddr)631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
632 {
633 switch (sa->sa_family) {
634 case AF_INET:
635 xaddr->a4 =
636 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
637 return AF_INET;
638 #if IS_ENABLED(CONFIG_IPV6)
639 case AF_INET6:
640 memcpy(xaddr->a6,
641 &((struct sockaddr_in6 *)sa)->sin6_addr,
642 sizeof(struct in6_addr));
643 return AF_INET6;
644 #endif
645 }
646 return 0;
647 }
648
649 static
pfkey_sadb_addr2xfrm_addr(const struct sadb_address * addr,xfrm_address_t * xaddr)650 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
651 {
652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
653 xaddr);
654 }
655
pfkey_xfrm_state_lookup(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)656 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
657 {
658 const struct sadb_sa *sa;
659 const struct sadb_address *addr;
660 uint16_t proto;
661 unsigned short family;
662 xfrm_address_t *xaddr;
663
664 sa = ext_hdrs[SADB_EXT_SA - 1];
665 if (sa == NULL)
666 return NULL;
667
668 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
669 if (proto == 0)
670 return NULL;
671
672 /* sadb_address_len should be checked by caller */
673 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
674 if (addr == NULL)
675 return NULL;
676
677 family = ((const struct sockaddr *)(addr + 1))->sa_family;
678 switch (family) {
679 case AF_INET:
680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
681 break;
682 #if IS_ENABLED(CONFIG_IPV6)
683 case AF_INET6:
684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
685 break;
686 #endif
687 default:
688 xaddr = NULL;
689 }
690
691 if (!xaddr)
692 return NULL;
693
694 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
695 }
696
697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
698
699 static int
pfkey_sockaddr_size(sa_family_t family)700 pfkey_sockaddr_size(sa_family_t family)
701 {
702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
703 }
704
pfkey_mode_from_xfrm(int mode)705 static inline int pfkey_mode_from_xfrm(int mode)
706 {
707 switch(mode) {
708 case XFRM_MODE_TRANSPORT:
709 return IPSEC_MODE_TRANSPORT;
710 case XFRM_MODE_TUNNEL:
711 return IPSEC_MODE_TUNNEL;
712 case XFRM_MODE_BEET:
713 return IPSEC_MODE_BEET;
714 default:
715 return -1;
716 }
717 }
718
pfkey_mode_to_xfrm(int mode)719 static inline int pfkey_mode_to_xfrm(int mode)
720 {
721 switch(mode) {
722 case IPSEC_MODE_ANY: /*XXX*/
723 case IPSEC_MODE_TRANSPORT:
724 return XFRM_MODE_TRANSPORT;
725 case IPSEC_MODE_TUNNEL:
726 return XFRM_MODE_TUNNEL;
727 case IPSEC_MODE_BEET:
728 return XFRM_MODE_BEET;
729 default:
730 return -1;
731 }
732 }
733
pfkey_sockaddr_fill(const xfrm_address_t * xaddr,__be16 port,struct sockaddr * sa,unsigned short family)734 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
735 struct sockaddr *sa,
736 unsigned short family)
737 {
738 switch (family) {
739 case AF_INET:
740 {
741 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
742 sin->sin_family = AF_INET;
743 sin->sin_port = port;
744 sin->sin_addr.s_addr = xaddr->a4;
745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
746 return 32;
747 }
748 #if IS_ENABLED(CONFIG_IPV6)
749 case AF_INET6:
750 {
751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
752 sin6->sin6_family = AF_INET6;
753 sin6->sin6_port = port;
754 sin6->sin6_flowinfo = 0;
755 sin6->sin6_addr = xaddr->in6;
756 sin6->sin6_scope_id = 0;
757 return 128;
758 }
759 #endif
760 }
761 return 0;
762 }
763
__pfkey_xfrm_state2msg(const struct xfrm_state * x,int add_keys,int hsc)764 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
765 int add_keys, int hsc)
766 {
767 struct sk_buff *skb;
768 struct sadb_msg *hdr;
769 struct sadb_sa *sa;
770 struct sadb_lifetime *lifetime;
771 struct sadb_address *addr;
772 struct sadb_key *key;
773 struct sadb_x_sa2 *sa2;
774 struct sadb_x_sec_ctx *sec_ctx;
775 struct xfrm_sec_ctx *xfrm_ctx;
776 int ctx_size = 0;
777 int size;
778 int auth_key_size = 0;
779 int encrypt_key_size = 0;
780 int sockaddr_size;
781 struct xfrm_encap_tmpl *natt = NULL;
782 int mode;
783
784 /* address family check */
785 sockaddr_size = pfkey_sockaddr_size(x->props.family);
786 if (!sockaddr_size)
787 return ERR_PTR(-EINVAL);
788
789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
790 key(AE), (identity(SD),) (sensitivity)> */
791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
792 sizeof(struct sadb_lifetime) +
793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
795 sizeof(struct sadb_address)*2 +
796 sockaddr_size*2 +
797 sizeof(struct sadb_x_sa2);
798
799 if ((xfrm_ctx = x->security)) {
800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
802 }
803
804 /* identity & sensitivity */
805 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
806 size += sizeof(struct sadb_address) + sockaddr_size;
807
808 if (add_keys) {
809 if (x->aalg && x->aalg->alg_key_len) {
810 auth_key_size =
811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
812 size += sizeof(struct sadb_key) + auth_key_size;
813 }
814 if (x->ealg && x->ealg->alg_key_len) {
815 encrypt_key_size =
816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
817 size += sizeof(struct sadb_key) + encrypt_key_size;
818 }
819 }
820 if (x->encap)
821 natt = x->encap;
822
823 if (natt && natt->encap_type) {
824 size += sizeof(struct sadb_x_nat_t_type);
825 size += sizeof(struct sadb_x_nat_t_port);
826 size += sizeof(struct sadb_x_nat_t_port);
827 }
828
829 skb = alloc_skb(size + 16, GFP_ATOMIC);
830 if (skb == NULL)
831 return ERR_PTR(-ENOBUFS);
832
833 /* call should fill header later */
834 hdr = skb_put(skb, sizeof(struct sadb_msg));
835 memset(hdr, 0, size); /* XXX do we need this ? */
836 hdr->sadb_msg_len = size / sizeof(uint64_t);
837
838 /* sa */
839 sa = skb_put(skb, sizeof(struct sadb_sa));
840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
841 sa->sadb_sa_exttype = SADB_EXT_SA;
842 sa->sadb_sa_spi = x->id.spi;
843 sa->sadb_sa_replay = x->props.replay_window;
844 switch (x->km.state) {
845 case XFRM_STATE_VALID:
846 sa->sadb_sa_state = x->km.dying ?
847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
848 break;
849 case XFRM_STATE_ACQ:
850 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
851 break;
852 default:
853 sa->sadb_sa_state = SADB_SASTATE_DEAD;
854 break;
855 }
856 sa->sadb_sa_auth = 0;
857 if (x->aalg) {
858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
859 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
860 a->desc.sadb_alg_id : 0;
861 }
862 sa->sadb_sa_encrypt = 0;
863 BUG_ON(x->ealg && x->calg);
864 if (x->ealg) {
865 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
866 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
867 a->desc.sadb_alg_id : 0;
868 }
869 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
870 if (x->calg) {
871 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
872 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
873 a->desc.sadb_alg_id : 0;
874 }
875
876 sa->sadb_sa_flags = 0;
877 if (x->props.flags & XFRM_STATE_NOECN)
878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
879 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
880 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
881 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
883
884 /* hard time */
885 if (hsc & 2) {
886 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
887 lifetime->sadb_lifetime_len =
888 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
889 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
890 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
891 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
892 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
893 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
894 }
895 /* soft time */
896 if (hsc & 1) {
897 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
898 lifetime->sadb_lifetime_len =
899 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
900 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
901 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
902 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
903 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
904 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
905 }
906 /* current time */
907 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
908 lifetime->sadb_lifetime_len =
909 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
911 lifetime->sadb_lifetime_allocations = x->curlft.packets;
912 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
913 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
914 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
915 /* src address */
916 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
917 addr->sadb_address_len =
918 (sizeof(struct sadb_address)+sockaddr_size)/
919 sizeof(uint64_t);
920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
921 /* "if the ports are non-zero, then the sadb_address_proto field,
922 normally zero, MUST be filled in with the transport
923 protocol's number." - RFC2367 */
924 addr->sadb_address_proto = 0;
925 addr->sadb_address_reserved = 0;
926
927 addr->sadb_address_prefixlen =
928 pfkey_sockaddr_fill(&x->props.saddr, 0,
929 (struct sockaddr *) (addr + 1),
930 x->props.family);
931 BUG_ON(!addr->sadb_address_prefixlen);
932
933 /* dst address */
934 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
935 addr->sadb_address_len =
936 (sizeof(struct sadb_address)+sockaddr_size)/
937 sizeof(uint64_t);
938 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
939 addr->sadb_address_proto = 0;
940 addr->sadb_address_reserved = 0;
941
942 addr->sadb_address_prefixlen =
943 pfkey_sockaddr_fill(&x->id.daddr, 0,
944 (struct sockaddr *) (addr + 1),
945 x->props.family);
946 BUG_ON(!addr->sadb_address_prefixlen);
947
948 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
949 x->props.family)) {
950 addr = skb_put(skb,
951 sizeof(struct sadb_address) + sockaddr_size);
952 addr->sadb_address_len =
953 (sizeof(struct sadb_address)+sockaddr_size)/
954 sizeof(uint64_t);
955 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
956 addr->sadb_address_proto =
957 pfkey_proto_from_xfrm(x->sel.proto);
958 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
959 addr->sadb_address_reserved = 0;
960
961 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
962 (struct sockaddr *) (addr + 1),
963 x->props.family);
964 }
965
966 /* auth key */
967 if (add_keys && auth_key_size) {
968 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
969 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
970 sizeof(uint64_t);
971 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
972 key->sadb_key_bits = x->aalg->alg_key_len;
973 key->sadb_key_reserved = 0;
974 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
975 }
976 /* encrypt key */
977 if (add_keys && encrypt_key_size) {
978 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
979 key->sadb_key_len = (sizeof(struct sadb_key) +
980 encrypt_key_size) / sizeof(uint64_t);
981 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
982 key->sadb_key_bits = x->ealg->alg_key_len;
983 key->sadb_key_reserved = 0;
984 memcpy(key + 1, x->ealg->alg_key,
985 (x->ealg->alg_key_len+7)/8);
986 }
987
988 /* sa */
989 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
990 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
991 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
992 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
993 kfree_skb(skb);
994 return ERR_PTR(-EINVAL);
995 }
996 sa2->sadb_x_sa2_mode = mode;
997 sa2->sadb_x_sa2_reserved1 = 0;
998 sa2->sadb_x_sa2_reserved2 = 0;
999 sa2->sadb_x_sa2_sequence = 0;
1000 sa2->sadb_x_sa2_reqid = x->props.reqid;
1001
1002 if (natt && natt->encap_type) {
1003 struct sadb_x_nat_t_type *n_type;
1004 struct sadb_x_nat_t_port *n_port;
1005
1006 /* type */
1007 n_type = skb_put(skb, sizeof(*n_type));
1008 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1009 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1010 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1011 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1012 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1013 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1014
1015 /* source port */
1016 n_port = skb_put(skb, sizeof(*n_port));
1017 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1018 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1019 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1020 n_port->sadb_x_nat_t_port_reserved = 0;
1021
1022 /* dest port */
1023 n_port = skb_put(skb, sizeof(*n_port));
1024 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1025 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1026 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1027 n_port->sadb_x_nat_t_port_reserved = 0;
1028 }
1029
1030 /* security context */
1031 if (xfrm_ctx) {
1032 sec_ctx = skb_put(skb,
1033 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1034 sec_ctx->sadb_x_sec_len =
1035 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1036 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1037 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1038 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1039 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1040 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1041 xfrm_ctx->ctx_len);
1042 }
1043
1044 return skb;
1045 }
1046
1047
pfkey_xfrm_state2msg(const struct xfrm_state * x)1048 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1049 {
1050 struct sk_buff *skb;
1051
1052 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1053
1054 return skb;
1055 }
1056
pfkey_xfrm_state2msg_expire(const struct xfrm_state * x,int hsc)1057 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1058 int hsc)
1059 {
1060 return __pfkey_xfrm_state2msg(x, 0, hsc);
1061 }
1062
pfkey_msg2xfrm_state(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)1063 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1064 const struct sadb_msg *hdr,
1065 void * const *ext_hdrs)
1066 {
1067 struct xfrm_state *x;
1068 const struct sadb_lifetime *lifetime;
1069 const struct sadb_sa *sa;
1070 const struct sadb_key *key;
1071 const struct sadb_x_sec_ctx *sec_ctx;
1072 uint16_t proto;
1073 int err;
1074
1075
1076 sa = ext_hdrs[SADB_EXT_SA - 1];
1077 if (!sa ||
1078 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1079 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1080 return ERR_PTR(-EINVAL);
1081 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1082 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1083 return ERR_PTR(-EINVAL);
1084 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1085 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1086 return ERR_PTR(-EINVAL);
1087 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1088 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1089 return ERR_PTR(-EINVAL);
1090
1091 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1092 if (proto == 0)
1093 return ERR_PTR(-EINVAL);
1094
1095 /* default error is no buffer space */
1096 err = -ENOBUFS;
1097
1098 /* RFC2367:
1099
1100 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1101 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1102 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1103 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1104 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1105 not true.
1106
1107 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1108 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1109 */
1110 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1111 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1112 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1113 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1114 return ERR_PTR(-EINVAL);
1115 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1116 if (key != NULL &&
1117 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1118 key->sadb_key_bits == 0)
1119 return ERR_PTR(-EINVAL);
1120 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1121 if (key != NULL &&
1122 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1123 key->sadb_key_bits == 0)
1124 return ERR_PTR(-EINVAL);
1125
1126 x = xfrm_state_alloc(net);
1127 if (x == NULL)
1128 return ERR_PTR(-ENOBUFS);
1129
1130 x->id.proto = proto;
1131 x->id.spi = sa->sadb_sa_spi;
1132 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1133 (sizeof(x->replay.bitmap) * 8));
1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1135 x->props.flags |= XFRM_STATE_NOECN;
1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1137 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1138 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1139 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1140
1141 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1142 if (lifetime != NULL) {
1143 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1144 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1145 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1146 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1147 }
1148 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1149 if (lifetime != NULL) {
1150 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1151 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1152 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1153 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1154 }
1155
1156 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1157 if (sec_ctx != NULL) {
1158 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1159
1160 if (!uctx)
1161 goto out;
1162
1163 err = security_xfrm_state_alloc(x, uctx);
1164 kfree(uctx);
1165
1166 if (err)
1167 goto out;
1168 }
1169
1170 err = -ENOBUFS;
1171 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1172 if (sa->sadb_sa_auth) {
1173 int keysize = 0;
1174 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1175 if (!a || !a->pfkey_supported) {
1176 err = -ENOSYS;
1177 goto out;
1178 }
1179 if (key)
1180 keysize = (key->sadb_key_bits + 7) / 8;
1181 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1182 if (!x->aalg) {
1183 err = -ENOMEM;
1184 goto out;
1185 }
1186 strcpy(x->aalg->alg_name, a->name);
1187 x->aalg->alg_key_len = 0;
1188 if (key) {
1189 x->aalg->alg_key_len = key->sadb_key_bits;
1190 memcpy(x->aalg->alg_key, key+1, keysize);
1191 }
1192 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1193 x->props.aalgo = sa->sadb_sa_auth;
1194 /* x->algo.flags = sa->sadb_sa_flags; */
1195 }
1196 if (sa->sadb_sa_encrypt) {
1197 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1198 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1199 if (!a || !a->pfkey_supported) {
1200 err = -ENOSYS;
1201 goto out;
1202 }
1203 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1204 if (!x->calg) {
1205 err = -ENOMEM;
1206 goto out;
1207 }
1208 strcpy(x->calg->alg_name, a->name);
1209 x->props.calgo = sa->sadb_sa_encrypt;
1210 } else {
1211 int keysize = 0;
1212 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1213 if (!a || !a->pfkey_supported) {
1214 err = -ENOSYS;
1215 goto out;
1216 }
1217 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1218 if (key)
1219 keysize = (key->sadb_key_bits + 7) / 8;
1220 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1221 if (!x->ealg) {
1222 err = -ENOMEM;
1223 goto out;
1224 }
1225 strcpy(x->ealg->alg_name, a->name);
1226 x->ealg->alg_key_len = 0;
1227 if (key) {
1228 x->ealg->alg_key_len = key->sadb_key_bits;
1229 memcpy(x->ealg->alg_key, key+1, keysize);
1230 }
1231 x->props.ealgo = sa->sadb_sa_encrypt;
1232 x->geniv = a->uinfo.encr.geniv;
1233 }
1234 }
1235 /* x->algo.flags = sa->sadb_sa_flags; */
1236
1237 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1238 &x->props.saddr);
1239 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1240 &x->id.daddr);
1241
1242 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1243 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1244 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1245 if (mode < 0) {
1246 err = -EINVAL;
1247 goto out;
1248 }
1249 x->props.mode = mode;
1250 x->props.reqid = sa2->sadb_x_sa2_reqid;
1251 }
1252
1253 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1254 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1255
1256 /* Nobody uses this, but we try. */
1257 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1258 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1259 }
1260
1261 if (!x->sel.family)
1262 x->sel.family = x->props.family;
1263
1264 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1265 const struct sadb_x_nat_t_type* n_type;
1266 struct xfrm_encap_tmpl *natt;
1267
1268 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1269 if (!x->encap) {
1270 err = -ENOMEM;
1271 goto out;
1272 }
1273
1274 natt = x->encap;
1275 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1276 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1277
1278 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1279 const struct sadb_x_nat_t_port *n_port =
1280 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1281 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1282 }
1283 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1284 const struct sadb_x_nat_t_port *n_port =
1285 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1286 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1287 }
1288 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1289 }
1290
1291 err = xfrm_init_state(x);
1292 if (err)
1293 goto out;
1294
1295 x->km.seq = hdr->sadb_msg_seq;
1296 return x;
1297
1298 out:
1299 x->km.state = XFRM_STATE_DEAD;
1300 xfrm_state_put(x);
1301 return ERR_PTR(err);
1302 }
1303
pfkey_reserved(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1305 {
1306 return -EOPNOTSUPP;
1307 }
1308
pfkey_getspi(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1310 {
1311 struct net *net = sock_net(sk);
1312 struct sk_buff *resp_skb;
1313 struct sadb_x_sa2 *sa2;
1314 struct sadb_address *saddr, *daddr;
1315 struct sadb_msg *out_hdr;
1316 struct sadb_spirange *range;
1317 struct xfrm_state *x = NULL;
1318 int mode;
1319 int err;
1320 u32 min_spi, max_spi;
1321 u32 reqid;
1322 u8 proto;
1323 unsigned short family;
1324 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1325
1326 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1327 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1328 return -EINVAL;
1329
1330 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1331 if (proto == 0)
1332 return -EINVAL;
1333
1334 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1335 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1336 if (mode < 0)
1337 return -EINVAL;
1338 reqid = sa2->sadb_x_sa2_reqid;
1339 } else {
1340 mode = 0;
1341 reqid = 0;
1342 }
1343
1344 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1345 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1346
1347 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1348 switch (family) {
1349 case AF_INET:
1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1352 break;
1353 #if IS_ENABLED(CONFIG_IPV6)
1354 case AF_INET6:
1355 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1356 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1357 break;
1358 #endif
1359 }
1360
1361 if (hdr->sadb_msg_seq) {
1362 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1363 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1364 xfrm_state_put(x);
1365 x = NULL;
1366 }
1367 }
1368
1369 if (!x)
1370 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1371
1372 if (x == NULL)
1373 return -ENOENT;
1374
1375 min_spi = 0x100;
1376 max_spi = 0x0fffffff;
1377
1378 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1379 if (range) {
1380 min_spi = range->sadb_spirange_min;
1381 max_spi = range->sadb_spirange_max;
1382 }
1383
1384 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1385 if (err) {
1386 xfrm_state_put(x);
1387 return err;
1388 }
1389
1390 err = xfrm_alloc_spi(x, min_spi, max_spi);
1391 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1392
1393 if (IS_ERR(resp_skb)) {
1394 xfrm_state_put(x);
1395 return PTR_ERR(resp_skb);
1396 }
1397
1398 out_hdr = (struct sadb_msg *) resp_skb->data;
1399 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1400 out_hdr->sadb_msg_type = SADB_GETSPI;
1401 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1402 out_hdr->sadb_msg_errno = 0;
1403 out_hdr->sadb_msg_reserved = 0;
1404 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1405 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1406
1407 xfrm_state_put(x);
1408
1409 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1410
1411 return 0;
1412 }
1413
pfkey_acquire(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1414 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1415 {
1416 struct net *net = sock_net(sk);
1417 struct xfrm_state *x;
1418
1419 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1420 return -EOPNOTSUPP;
1421
1422 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1423 return 0;
1424
1425 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1426 if (x == NULL)
1427 return 0;
1428
1429 spin_lock_bh(&x->lock);
1430 if (x->km.state == XFRM_STATE_ACQ)
1431 x->km.state = XFRM_STATE_ERROR;
1432
1433 spin_unlock_bh(&x->lock);
1434 xfrm_state_put(x);
1435 return 0;
1436 }
1437
event2poltype(int event)1438 static inline int event2poltype(int event)
1439 {
1440 switch (event) {
1441 case XFRM_MSG_DELPOLICY:
1442 return SADB_X_SPDDELETE;
1443 case XFRM_MSG_NEWPOLICY:
1444 return SADB_X_SPDADD;
1445 case XFRM_MSG_UPDPOLICY:
1446 return SADB_X_SPDUPDATE;
1447 case XFRM_MSG_POLEXPIRE:
1448 // return SADB_X_SPDEXPIRE;
1449 default:
1450 pr_err("pfkey: Unknown policy event %d\n", event);
1451 break;
1452 }
1453
1454 return 0;
1455 }
1456
event2keytype(int event)1457 static inline int event2keytype(int event)
1458 {
1459 switch (event) {
1460 case XFRM_MSG_DELSA:
1461 return SADB_DELETE;
1462 case XFRM_MSG_NEWSA:
1463 return SADB_ADD;
1464 case XFRM_MSG_UPDSA:
1465 return SADB_UPDATE;
1466 case XFRM_MSG_EXPIRE:
1467 return SADB_EXPIRE;
1468 default:
1469 pr_err("pfkey: Unknown SA event %d\n", event);
1470 break;
1471 }
1472
1473 return 0;
1474 }
1475
1476 /* ADD/UPD/DEL */
key_notify_sa(struct xfrm_state * x,const struct km_event * c)1477 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1478 {
1479 struct sk_buff *skb;
1480 struct sadb_msg *hdr;
1481
1482 skb = pfkey_xfrm_state2msg(x);
1483
1484 if (IS_ERR(skb))
1485 return PTR_ERR(skb);
1486
1487 hdr = (struct sadb_msg *) skb->data;
1488 hdr->sadb_msg_version = PF_KEY_V2;
1489 hdr->sadb_msg_type = event2keytype(c->event);
1490 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1491 hdr->sadb_msg_errno = 0;
1492 hdr->sadb_msg_reserved = 0;
1493 hdr->sadb_msg_seq = c->seq;
1494 hdr->sadb_msg_pid = c->portid;
1495
1496 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1497
1498 return 0;
1499 }
1500
pfkey_add(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1501 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1502 {
1503 struct net *net = sock_net(sk);
1504 struct xfrm_state *x;
1505 int err;
1506 struct km_event c;
1507
1508 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1509 if (IS_ERR(x))
1510 return PTR_ERR(x);
1511
1512 xfrm_state_hold(x);
1513 if (hdr->sadb_msg_type == SADB_ADD)
1514 err = xfrm_state_add(x);
1515 else
1516 err = xfrm_state_update(x);
1517
1518 xfrm_audit_state_add(x, err ? 0 : 1, true);
1519
1520 if (err < 0) {
1521 x->km.state = XFRM_STATE_DEAD;
1522 __xfrm_state_put(x);
1523 goto out;
1524 }
1525
1526 if (hdr->sadb_msg_type == SADB_ADD)
1527 c.event = XFRM_MSG_NEWSA;
1528 else
1529 c.event = XFRM_MSG_UPDSA;
1530 c.seq = hdr->sadb_msg_seq;
1531 c.portid = hdr->sadb_msg_pid;
1532 km_state_notify(x, &c);
1533 out:
1534 xfrm_state_put(x);
1535 return err;
1536 }
1537
pfkey_delete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1538 static int pfkey_delete(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 struct xfrm_state *x;
1542 struct km_event c;
1543 int err;
1544
1545 if (!ext_hdrs[SADB_EXT_SA-1] ||
1546 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548 return -EINVAL;
1549
1550 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551 if (x == NULL)
1552 return -ESRCH;
1553
1554 if ((err = security_xfrm_state_delete(x)))
1555 goto out;
1556
1557 if (xfrm_state_kern(x)) {
1558 err = -EPERM;
1559 goto out;
1560 }
1561
1562 err = xfrm_state_delete(x);
1563
1564 if (err < 0)
1565 goto out;
1566
1567 c.seq = hdr->sadb_msg_seq;
1568 c.portid = hdr->sadb_msg_pid;
1569 c.event = XFRM_MSG_DELSA;
1570 km_state_notify(x, &c);
1571 out:
1572 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1573 xfrm_state_put(x);
1574
1575 return err;
1576 }
1577
pfkey_get(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1579 {
1580 struct net *net = sock_net(sk);
1581 __u8 proto;
1582 struct sk_buff *out_skb;
1583 struct sadb_msg *out_hdr;
1584 struct xfrm_state *x;
1585
1586 if (!ext_hdrs[SADB_EXT_SA-1] ||
1587 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1588 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1589 return -EINVAL;
1590
1591 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1592 if (x == NULL)
1593 return -ESRCH;
1594
1595 out_skb = pfkey_xfrm_state2msg(x);
1596 proto = x->id.proto;
1597 xfrm_state_put(x);
1598 if (IS_ERR(out_skb))
1599 return PTR_ERR(out_skb);
1600
1601 out_hdr = (struct sadb_msg *) out_skb->data;
1602 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1603 out_hdr->sadb_msg_type = SADB_GET;
1604 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1605 out_hdr->sadb_msg_errno = 0;
1606 out_hdr->sadb_msg_reserved = 0;
1607 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1608 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1609 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1610
1611 return 0;
1612 }
1613
compose_sadb_supported(const struct sadb_msg * orig,gfp_t allocation)1614 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1615 gfp_t allocation)
1616 {
1617 struct sk_buff *skb;
1618 struct sadb_msg *hdr;
1619 int len, auth_len, enc_len, i;
1620
1621 auth_len = xfrm_count_pfkey_auth_supported();
1622 if (auth_len) {
1623 auth_len *= sizeof(struct sadb_alg);
1624 auth_len += sizeof(struct sadb_supported);
1625 }
1626
1627 enc_len = xfrm_count_pfkey_enc_supported();
1628 if (enc_len) {
1629 enc_len *= sizeof(struct sadb_alg);
1630 enc_len += sizeof(struct sadb_supported);
1631 }
1632
1633 len = enc_len + auth_len + sizeof(struct sadb_msg);
1634
1635 skb = alloc_skb(len + 16, allocation);
1636 if (!skb)
1637 goto out_put_algs;
1638
1639 hdr = skb_put(skb, sizeof(*hdr));
1640 pfkey_hdr_dup(hdr, orig);
1641 hdr->sadb_msg_errno = 0;
1642 hdr->sadb_msg_len = len / sizeof(uint64_t);
1643
1644 if (auth_len) {
1645 struct sadb_supported *sp;
1646 struct sadb_alg *ap;
1647
1648 sp = skb_put(skb, auth_len);
1649 ap = (struct sadb_alg *) (sp + 1);
1650
1651 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1652 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1653
1654 for (i = 0; ; i++) {
1655 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1656 if (!aalg)
1657 break;
1658 if (!aalg->pfkey_supported)
1659 continue;
1660 if (aalg->available)
1661 *ap++ = aalg->desc;
1662 }
1663 }
1664
1665 if (enc_len) {
1666 struct sadb_supported *sp;
1667 struct sadb_alg *ap;
1668
1669 sp = skb_put(skb, enc_len);
1670 ap = (struct sadb_alg *) (sp + 1);
1671
1672 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1673 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1674
1675 for (i = 0; ; i++) {
1676 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1677 if (!ealg)
1678 break;
1679 if (!ealg->pfkey_supported)
1680 continue;
1681 if (ealg->available)
1682 *ap++ = ealg->desc;
1683 }
1684 }
1685
1686 out_put_algs:
1687 return skb;
1688 }
1689
pfkey_register(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1690 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1691 {
1692 struct pfkey_sock *pfk = pfkey_sk(sk);
1693 struct sk_buff *supp_skb;
1694
1695 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1696 return -EINVAL;
1697
1698 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1699 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1700 return -EEXIST;
1701 pfk->registered |= (1<<hdr->sadb_msg_satype);
1702 }
1703
1704 xfrm_probe_algs();
1705
1706 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1707 if (!supp_skb) {
1708 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1709 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1710
1711 return -ENOBUFS;
1712 }
1713
1714 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1715 sock_net(sk));
1716 return 0;
1717 }
1718
unicast_flush_resp(struct sock * sk,const struct sadb_msg * ihdr)1719 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1720 {
1721 struct sk_buff *skb;
1722 struct sadb_msg *hdr;
1723
1724 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1725 if (!skb)
1726 return -ENOBUFS;
1727
1728 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1729 hdr->sadb_msg_errno = (uint8_t) 0;
1730 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1731
1732 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1733 sock_net(sk));
1734 }
1735
key_notify_sa_flush(const struct km_event * c)1736 static int key_notify_sa_flush(const struct km_event *c)
1737 {
1738 struct sk_buff *skb;
1739 struct sadb_msg *hdr;
1740
1741 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1742 if (!skb)
1743 return -ENOBUFS;
1744 hdr = skb_put(skb, sizeof(struct sadb_msg));
1745 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1746 hdr->sadb_msg_type = SADB_FLUSH;
1747 hdr->sadb_msg_seq = c->seq;
1748 hdr->sadb_msg_pid = c->portid;
1749 hdr->sadb_msg_version = PF_KEY_V2;
1750 hdr->sadb_msg_errno = (uint8_t) 0;
1751 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1752 hdr->sadb_msg_reserved = 0;
1753
1754 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1755
1756 return 0;
1757 }
1758
pfkey_flush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1759 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1760 {
1761 struct net *net = sock_net(sk);
1762 unsigned int proto;
1763 struct km_event c;
1764 int err, err2;
1765
1766 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1767 if (proto == 0)
1768 return -EINVAL;
1769
1770 err = xfrm_state_flush(net, proto, true, false);
1771 err2 = unicast_flush_resp(sk, hdr);
1772 if (err || err2) {
1773 if (err == -ESRCH) /* empty table - go quietly */
1774 err = 0;
1775 return err ? err : err2;
1776 }
1777
1778 c.data.proto = proto;
1779 c.seq = hdr->sadb_msg_seq;
1780 c.portid = hdr->sadb_msg_pid;
1781 c.event = XFRM_MSG_FLUSHSA;
1782 c.net = net;
1783 km_state_notify(NULL, &c);
1784
1785 return 0;
1786 }
1787
dump_sa(struct xfrm_state * x,int count,void * ptr)1788 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1789 {
1790 struct pfkey_sock *pfk = ptr;
1791 struct sk_buff *out_skb;
1792 struct sadb_msg *out_hdr;
1793
1794 if (!pfkey_can_dump(&pfk->sk))
1795 return -ENOBUFS;
1796
1797 out_skb = pfkey_xfrm_state2msg(x);
1798 if (IS_ERR(out_skb))
1799 return PTR_ERR(out_skb);
1800
1801 out_hdr = (struct sadb_msg *) out_skb->data;
1802 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1803 out_hdr->sadb_msg_type = SADB_DUMP;
1804 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1805 out_hdr->sadb_msg_errno = 0;
1806 out_hdr->sadb_msg_reserved = 0;
1807 out_hdr->sadb_msg_seq = count + 1;
1808 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1809
1810 if (pfk->dump.skb)
1811 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1812 &pfk->sk, sock_net(&pfk->sk));
1813 pfk->dump.skb = out_skb;
1814
1815 return 0;
1816 }
1817
pfkey_dump_sa(struct pfkey_sock * pfk)1818 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1819 {
1820 struct net *net = sock_net(&pfk->sk);
1821 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1822 }
1823
pfkey_dump_sa_done(struct pfkey_sock * pfk)1824 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1825 {
1826 struct net *net = sock_net(&pfk->sk);
1827
1828 xfrm_state_walk_done(&pfk->dump.u.state, net);
1829 }
1830
pfkey_dump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1831 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1832 {
1833 u8 proto;
1834 struct xfrm_address_filter *filter = NULL;
1835 struct pfkey_sock *pfk = pfkey_sk(sk);
1836
1837 mutex_lock(&pfk->dump_lock);
1838 if (pfk->dump.dump != NULL) {
1839 mutex_unlock(&pfk->dump_lock);
1840 return -EBUSY;
1841 }
1842
1843 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1844 if (proto == 0) {
1845 mutex_unlock(&pfk->dump_lock);
1846 return -EINVAL;
1847 }
1848
1849 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1850 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1851
1852 if ((xfilter->sadb_x_filter_splen >=
1853 (sizeof(xfrm_address_t) << 3)) ||
1854 (xfilter->sadb_x_filter_dplen >=
1855 (sizeof(xfrm_address_t) << 3))) {
1856 mutex_unlock(&pfk->dump_lock);
1857 return -EINVAL;
1858 }
1859 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1860 if (filter == NULL) {
1861 mutex_unlock(&pfk->dump_lock);
1862 return -ENOMEM;
1863 }
1864
1865 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1866 sizeof(xfrm_address_t));
1867 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1868 sizeof(xfrm_address_t));
1869 filter->family = xfilter->sadb_x_filter_family;
1870 filter->splen = xfilter->sadb_x_filter_splen;
1871 filter->dplen = xfilter->sadb_x_filter_dplen;
1872 }
1873
1874 pfk->dump.msg_version = hdr->sadb_msg_version;
1875 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1876 pfk->dump.dump = pfkey_dump_sa;
1877 pfk->dump.done = pfkey_dump_sa_done;
1878 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1879 mutex_unlock(&pfk->dump_lock);
1880
1881 return pfkey_do_dump(pfk);
1882 }
1883
pfkey_promisc(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1884 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1885 {
1886 struct pfkey_sock *pfk = pfkey_sk(sk);
1887 int satype = hdr->sadb_msg_satype;
1888 bool reset_errno = false;
1889
1890 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1891 reset_errno = true;
1892 if (satype != 0 && satype != 1)
1893 return -EINVAL;
1894 pfk->promisc = satype;
1895 }
1896 if (reset_errno && skb_cloned(skb))
1897 skb = skb_copy(skb, GFP_KERNEL);
1898 else
1899 skb = skb_clone(skb, GFP_KERNEL);
1900
1901 if (reset_errno && skb) {
1902 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1903 new_hdr->sadb_msg_errno = 0;
1904 }
1905
1906 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1907 return 0;
1908 }
1909
check_reqid(struct xfrm_policy * xp,int dir,int count,void * ptr)1910 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1911 {
1912 int i;
1913 u32 reqid = *(u32*)ptr;
1914
1915 for (i=0; i<xp->xfrm_nr; i++) {
1916 if (xp->xfrm_vec[i].reqid == reqid)
1917 return -EEXIST;
1918 }
1919 return 0;
1920 }
1921
gen_reqid(struct net * net)1922 static u32 gen_reqid(struct net *net)
1923 {
1924 struct xfrm_policy_walk walk;
1925 u32 start;
1926 int rc;
1927 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1928
1929 start = reqid;
1930 do {
1931 ++reqid;
1932 if (reqid == 0)
1933 reqid = IPSEC_MANUAL_REQID_MAX+1;
1934 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1935 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1936 xfrm_policy_walk_done(&walk, net);
1937 if (rc != -EEXIST)
1938 return reqid;
1939 } while (reqid != start);
1940 return 0;
1941 }
1942
1943 static int
parse_ipsecrequest(struct xfrm_policy * xp,struct sadb_x_ipsecrequest * rq)1944 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1945 {
1946 struct net *net = xp_net(xp);
1947 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1948 int mode;
1949
1950 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1951 return -ELOOP;
1952
1953 if (rq->sadb_x_ipsecrequest_mode == 0)
1954 return -EINVAL;
1955 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1956 return -EINVAL;
1957
1958 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1959 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1960 return -EINVAL;
1961 t->mode = mode;
1962 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1963 t->optional = 1;
1964 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1965 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1966 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1967 t->reqid = 0;
1968 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1969 return -ENOBUFS;
1970 }
1971
1972 /* addresses present only in tunnel mode */
1973 if (t->mode == XFRM_MODE_TUNNEL) {
1974 int err;
1975
1976 err = parse_sockaddr_pair(
1977 (struct sockaddr *)(rq + 1),
1978 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1979 &t->saddr, &t->id.daddr, &t->encap_family);
1980 if (err)
1981 return err;
1982 } else
1983 t->encap_family = xp->family;
1984
1985 /* No way to set this via kame pfkey */
1986 t->allalgs = 1;
1987 xp->xfrm_nr++;
1988 return 0;
1989 }
1990
1991 static int
parse_ipsecrequests(struct xfrm_policy * xp,struct sadb_x_policy * pol)1992 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1993 {
1994 int err;
1995 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1996 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1997
1998 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1999 return -EINVAL;
2000
2001 while (len >= sizeof(*rq)) {
2002 if (len < rq->sadb_x_ipsecrequest_len ||
2003 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2004 return -EINVAL;
2005
2006 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2007 return err;
2008 len -= rq->sadb_x_ipsecrequest_len;
2009 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2010 }
2011 return 0;
2012 }
2013
pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy * xp)2014 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2015 {
2016 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2017
2018 if (xfrm_ctx) {
2019 int len = sizeof(struct sadb_x_sec_ctx);
2020 len += xfrm_ctx->ctx_len;
2021 return PFKEY_ALIGN8(len);
2022 }
2023 return 0;
2024 }
2025
pfkey_xfrm_policy2msg_size(const struct xfrm_policy * xp)2026 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2027 {
2028 const struct xfrm_tmpl *t;
2029 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2030 int socklen = 0;
2031 int i;
2032
2033 for (i=0; i<xp->xfrm_nr; i++) {
2034 t = xp->xfrm_vec + i;
2035 socklen += pfkey_sockaddr_len(t->encap_family);
2036 }
2037
2038 return sizeof(struct sadb_msg) +
2039 (sizeof(struct sadb_lifetime) * 3) +
2040 (sizeof(struct sadb_address) * 2) +
2041 (sockaddr_size * 2) +
2042 sizeof(struct sadb_x_policy) +
2043 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2044 (socklen * 2) +
2045 pfkey_xfrm_policy2sec_ctx_size(xp);
2046 }
2047
pfkey_xfrm_policy2msg_prep(const struct xfrm_policy * xp)2048 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2049 {
2050 struct sk_buff *skb;
2051 int size;
2052
2053 size = pfkey_xfrm_policy2msg_size(xp);
2054
2055 skb = alloc_skb(size + 16, GFP_ATOMIC);
2056 if (skb == NULL)
2057 return ERR_PTR(-ENOBUFS);
2058
2059 return skb;
2060 }
2061
pfkey_xfrm_policy2msg(struct sk_buff * skb,const struct xfrm_policy * xp,int dir)2062 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2063 {
2064 struct sadb_msg *hdr;
2065 struct sadb_address *addr;
2066 struct sadb_lifetime *lifetime;
2067 struct sadb_x_policy *pol;
2068 struct sadb_x_sec_ctx *sec_ctx;
2069 struct xfrm_sec_ctx *xfrm_ctx;
2070 int i;
2071 int size;
2072 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2073 int socklen = pfkey_sockaddr_len(xp->family);
2074
2075 size = pfkey_xfrm_policy2msg_size(xp);
2076
2077 /* call should fill header later */
2078 hdr = skb_put(skb, sizeof(struct sadb_msg));
2079 memset(hdr, 0, size); /* XXX do we need this ? */
2080
2081 /* src address */
2082 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2083 addr->sadb_address_len =
2084 (sizeof(struct sadb_address)+sockaddr_size)/
2085 sizeof(uint64_t);
2086 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2087 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2088 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2089 addr->sadb_address_reserved = 0;
2090 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2091 xp->selector.sport,
2092 (struct sockaddr *) (addr + 1),
2093 xp->family))
2094 BUG();
2095
2096 /* dst address */
2097 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2098 addr->sadb_address_len =
2099 (sizeof(struct sadb_address)+sockaddr_size)/
2100 sizeof(uint64_t);
2101 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2102 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2103 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2104 addr->sadb_address_reserved = 0;
2105
2106 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2107 (struct sockaddr *) (addr + 1),
2108 xp->family);
2109
2110 /* hard time */
2111 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2112 lifetime->sadb_lifetime_len =
2113 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2114 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2115 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2116 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2117 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2118 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2119 /* soft time */
2120 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2121 lifetime->sadb_lifetime_len =
2122 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2123 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2124 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2125 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2126 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2127 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2128 /* current time */
2129 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2130 lifetime->sadb_lifetime_len =
2131 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2132 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2133 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2134 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2135 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2136 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2137
2138 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2139 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2140 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2141 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2142 if (xp->action == XFRM_POLICY_ALLOW) {
2143 if (xp->xfrm_nr)
2144 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2145 else
2146 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2147 }
2148 pol->sadb_x_policy_dir = dir+1;
2149 pol->sadb_x_policy_reserved = 0;
2150 pol->sadb_x_policy_id = xp->index;
2151 pol->sadb_x_policy_priority = xp->priority;
2152
2153 for (i=0; i<xp->xfrm_nr; i++) {
2154 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2155 struct sadb_x_ipsecrequest *rq;
2156 int req_size;
2157 int mode;
2158
2159 req_size = sizeof(struct sadb_x_ipsecrequest);
2160 if (t->mode == XFRM_MODE_TUNNEL) {
2161 socklen = pfkey_sockaddr_len(t->encap_family);
2162 req_size += socklen * 2;
2163 } else {
2164 size -= 2*socklen;
2165 }
2166 rq = skb_put(skb, req_size);
2167 pol->sadb_x_policy_len += req_size/8;
2168 memset(rq, 0, sizeof(*rq));
2169 rq->sadb_x_ipsecrequest_len = req_size;
2170 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2171 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2172 return -EINVAL;
2173 rq->sadb_x_ipsecrequest_mode = mode;
2174 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2175 if (t->reqid)
2176 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2177 if (t->optional)
2178 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2179 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2180
2181 if (t->mode == XFRM_MODE_TUNNEL) {
2182 u8 *sa = (void *)(rq + 1);
2183 pfkey_sockaddr_fill(&t->saddr, 0,
2184 (struct sockaddr *)sa,
2185 t->encap_family);
2186 pfkey_sockaddr_fill(&t->id.daddr, 0,
2187 (struct sockaddr *) (sa + socklen),
2188 t->encap_family);
2189 }
2190 }
2191
2192 /* security context */
2193 if ((xfrm_ctx = xp->security)) {
2194 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2195
2196 sec_ctx = skb_put(skb, ctx_size);
2197 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2198 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2199 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2200 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2201 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2202 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2203 xfrm_ctx->ctx_len);
2204 }
2205
2206 hdr->sadb_msg_len = size / sizeof(uint64_t);
2207 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2208
2209 return 0;
2210 }
2211
key_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)2212 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2213 {
2214 struct sk_buff *out_skb;
2215 struct sadb_msg *out_hdr;
2216 int err;
2217
2218 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2219 if (IS_ERR(out_skb))
2220 return PTR_ERR(out_skb);
2221
2222 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2223 if (err < 0) {
2224 kfree_skb(out_skb);
2225 return err;
2226 }
2227
2228 out_hdr = (struct sadb_msg *) out_skb->data;
2229 out_hdr->sadb_msg_version = PF_KEY_V2;
2230
2231 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2232 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2233 else
2234 out_hdr->sadb_msg_type = event2poltype(c->event);
2235 out_hdr->sadb_msg_errno = 0;
2236 out_hdr->sadb_msg_seq = c->seq;
2237 out_hdr->sadb_msg_pid = c->portid;
2238 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2239 return 0;
2240
2241 }
2242
pfkey_spdadd(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2243 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2244 {
2245 struct net *net = sock_net(sk);
2246 int err = 0;
2247 struct sadb_lifetime *lifetime;
2248 struct sadb_address *sa;
2249 struct sadb_x_policy *pol;
2250 struct xfrm_policy *xp;
2251 struct km_event c;
2252 struct sadb_x_sec_ctx *sec_ctx;
2253
2254 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2255 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2256 !ext_hdrs[SADB_X_EXT_POLICY-1])
2257 return -EINVAL;
2258
2259 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2260 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2261 return -EINVAL;
2262 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2263 return -EINVAL;
2264
2265 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2266 if (xp == NULL)
2267 return -ENOBUFS;
2268
2269 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2270 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2271 xp->priority = pol->sadb_x_policy_priority;
2272
2273 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2274 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2275 xp->selector.family = xp->family;
2276 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2277 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2278 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2279 if (xp->selector.sport)
2280 xp->selector.sport_mask = htons(0xffff);
2281
2282 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2283 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2284 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2285
2286 /* Amusing, we set this twice. KAME apps appear to set same value
2287 * in both addresses.
2288 */
2289 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2290
2291 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2292 if (xp->selector.dport)
2293 xp->selector.dport_mask = htons(0xffff);
2294
2295 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2296 if (sec_ctx != NULL) {
2297 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2298
2299 if (!uctx) {
2300 err = -ENOBUFS;
2301 goto out;
2302 }
2303
2304 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2305 kfree(uctx);
2306
2307 if (err)
2308 goto out;
2309 }
2310
2311 xp->lft.soft_byte_limit = XFRM_INF;
2312 xp->lft.hard_byte_limit = XFRM_INF;
2313 xp->lft.soft_packet_limit = XFRM_INF;
2314 xp->lft.hard_packet_limit = XFRM_INF;
2315 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2316 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2317 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2318 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2319 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2320 }
2321 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2322 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2323 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2324 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2325 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2326 }
2327 xp->xfrm_nr = 0;
2328 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2329 (err = parse_ipsecrequests(xp, pol)) < 0)
2330 goto out;
2331
2332 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2333 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2334
2335 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2336
2337 if (err)
2338 goto out;
2339
2340 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2341 c.event = XFRM_MSG_UPDPOLICY;
2342 else
2343 c.event = XFRM_MSG_NEWPOLICY;
2344
2345 c.seq = hdr->sadb_msg_seq;
2346 c.portid = hdr->sadb_msg_pid;
2347
2348 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2349 xfrm_pol_put(xp);
2350 return 0;
2351
2352 out:
2353 xp->walk.dead = 1;
2354 xfrm_policy_destroy(xp);
2355 return err;
2356 }
2357
pfkey_spddelete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2358 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2359 {
2360 struct net *net = sock_net(sk);
2361 int err;
2362 struct sadb_address *sa;
2363 struct sadb_x_policy *pol;
2364 struct xfrm_policy *xp;
2365 struct xfrm_selector sel;
2366 struct km_event c;
2367 struct sadb_x_sec_ctx *sec_ctx;
2368 struct xfrm_sec_ctx *pol_ctx = NULL;
2369
2370 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2371 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2372 !ext_hdrs[SADB_X_EXT_POLICY-1])
2373 return -EINVAL;
2374
2375 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2376 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2377 return -EINVAL;
2378
2379 memset(&sel, 0, sizeof(sel));
2380
2381 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2382 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2383 sel.prefixlen_s = sa->sadb_address_prefixlen;
2384 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2385 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2386 if (sel.sport)
2387 sel.sport_mask = htons(0xffff);
2388
2389 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2390 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2391 sel.prefixlen_d = sa->sadb_address_prefixlen;
2392 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2393 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2394 if (sel.dport)
2395 sel.dport_mask = htons(0xffff);
2396
2397 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2398 if (sec_ctx != NULL) {
2399 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2400
2401 if (!uctx)
2402 return -ENOMEM;
2403
2404 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2405 kfree(uctx);
2406 if (err)
2407 return err;
2408 }
2409
2410 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2411 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2412 1, &err);
2413 security_xfrm_policy_free(pol_ctx);
2414 if (xp == NULL)
2415 return -ENOENT;
2416
2417 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2418
2419 if (err)
2420 goto out;
2421
2422 c.seq = hdr->sadb_msg_seq;
2423 c.portid = hdr->sadb_msg_pid;
2424 c.data.byid = 0;
2425 c.event = XFRM_MSG_DELPOLICY;
2426 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2427
2428 out:
2429 xfrm_pol_put(xp);
2430 return err;
2431 }
2432
key_pol_get_resp(struct sock * sk,struct xfrm_policy * xp,const struct sadb_msg * hdr,int dir)2433 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2434 {
2435 int err;
2436 struct sk_buff *out_skb;
2437 struct sadb_msg *out_hdr;
2438 err = 0;
2439
2440 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2441 if (IS_ERR(out_skb)) {
2442 err = PTR_ERR(out_skb);
2443 goto out;
2444 }
2445 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2446 if (err < 0) {
2447 kfree_skb(out_skb);
2448 goto out;
2449 }
2450
2451 out_hdr = (struct sadb_msg *) out_skb->data;
2452 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2453 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2454 out_hdr->sadb_msg_satype = 0;
2455 out_hdr->sadb_msg_errno = 0;
2456 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2457 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2458 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2459 err = 0;
2460
2461 out:
2462 return err;
2463 }
2464
pfkey_sockaddr_pair_size(sa_family_t family)2465 static int pfkey_sockaddr_pair_size(sa_family_t family)
2466 {
2467 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2468 }
2469
parse_sockaddr_pair(struct sockaddr * sa,int ext_len,xfrm_address_t * saddr,xfrm_address_t * daddr,u16 * family)2470 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2471 xfrm_address_t *saddr, xfrm_address_t *daddr,
2472 u16 *family)
2473 {
2474 int af, socklen;
2475
2476 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2477 return -EINVAL;
2478
2479 af = pfkey_sockaddr_extract(sa, saddr);
2480 if (!af)
2481 return -EINVAL;
2482
2483 socklen = pfkey_sockaddr_len(af);
2484 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2485 daddr) != af)
2486 return -EINVAL;
2487
2488 *family = af;
2489 return 0;
2490 }
2491
2492 #ifdef CONFIG_NET_KEY_MIGRATE
ipsecrequests_to_migrate(struct sadb_x_ipsecrequest * rq1,int len,struct xfrm_migrate * m)2493 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2494 struct xfrm_migrate *m)
2495 {
2496 int err;
2497 struct sadb_x_ipsecrequest *rq2;
2498 int mode;
2499
2500 if (len < sizeof(*rq1) ||
2501 len < rq1->sadb_x_ipsecrequest_len ||
2502 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2503 return -EINVAL;
2504
2505 /* old endoints */
2506 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2507 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2508 &m->old_saddr, &m->old_daddr,
2509 &m->old_family);
2510 if (err)
2511 return err;
2512
2513 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2514 len -= rq1->sadb_x_ipsecrequest_len;
2515
2516 if (len <= sizeof(*rq2) ||
2517 len < rq2->sadb_x_ipsecrequest_len ||
2518 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2519 return -EINVAL;
2520
2521 /* new endpoints */
2522 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2523 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2524 &m->new_saddr, &m->new_daddr,
2525 &m->new_family);
2526 if (err)
2527 return err;
2528
2529 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2530 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2531 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2532 return -EINVAL;
2533
2534 m->proto = rq1->sadb_x_ipsecrequest_proto;
2535 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2536 return -EINVAL;
2537 m->mode = mode;
2538 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2539
2540 return ((int)(rq1->sadb_x_ipsecrequest_len +
2541 rq2->sadb_x_ipsecrequest_len));
2542 }
2543
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2544 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2545 const struct sadb_msg *hdr, void * const *ext_hdrs)
2546 {
2547 int i, len, ret, err = -EINVAL;
2548 u8 dir;
2549 struct sadb_address *sa;
2550 struct sadb_x_kmaddress *kma;
2551 struct sadb_x_policy *pol;
2552 struct sadb_x_ipsecrequest *rq;
2553 struct xfrm_selector sel;
2554 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2555 struct xfrm_kmaddress k;
2556 struct net *net = sock_net(sk);
2557
2558 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2559 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2560 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2561 err = -EINVAL;
2562 goto out;
2563 }
2564
2565 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2566 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2567
2568 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2569 err = -EINVAL;
2570 goto out;
2571 }
2572
2573 if (kma) {
2574 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2575 k.reserved = kma->sadb_x_kmaddress_reserved;
2576 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2577 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2578 &k.local, &k.remote, &k.family);
2579 if (ret < 0) {
2580 err = ret;
2581 goto out;
2582 }
2583 }
2584
2585 dir = pol->sadb_x_policy_dir - 1;
2586 memset(&sel, 0, sizeof(sel));
2587
2588 /* set source address info of selector */
2589 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2590 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2591 sel.prefixlen_s = sa->sadb_address_prefixlen;
2592 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2593 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2594 if (sel.sport)
2595 sel.sport_mask = htons(0xffff);
2596
2597 /* set destination address info of selector */
2598 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2599 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2600 sel.prefixlen_d = sa->sadb_address_prefixlen;
2601 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2602 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2603 if (sel.dport)
2604 sel.dport_mask = htons(0xffff);
2605
2606 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2607
2608 /* extract ipsecrequests */
2609 i = 0;
2610 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2611
2612 while (len > 0 && i < XFRM_MAX_DEPTH) {
2613 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2614 if (ret < 0) {
2615 err = ret;
2616 goto out;
2617 } else {
2618 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2619 len -= ret;
2620 i++;
2621 }
2622 }
2623
2624 if (!i || len > 0) {
2625 err = -EINVAL;
2626 goto out;
2627 }
2628
2629 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2630 kma ? &k : NULL, net, NULL);
2631
2632 out:
2633 return err;
2634 }
2635 #else
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2636 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2637 const struct sadb_msg *hdr, void * const *ext_hdrs)
2638 {
2639 return -ENOPROTOOPT;
2640 }
2641 #endif
2642
2643
pfkey_spdget(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2644 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2645 {
2646 struct net *net = sock_net(sk);
2647 unsigned int dir;
2648 int err = 0, delete;
2649 struct sadb_x_policy *pol;
2650 struct xfrm_policy *xp;
2651 struct km_event c;
2652
2653 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2654 return -EINVAL;
2655
2656 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2657 if (dir >= XFRM_POLICY_MAX)
2658 return -EINVAL;
2659
2660 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2661 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2662 dir, pol->sadb_x_policy_id, delete, &err);
2663 if (xp == NULL)
2664 return -ENOENT;
2665
2666 if (delete) {
2667 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2668
2669 if (err)
2670 goto out;
2671 c.seq = hdr->sadb_msg_seq;
2672 c.portid = hdr->sadb_msg_pid;
2673 c.data.byid = 1;
2674 c.event = XFRM_MSG_DELPOLICY;
2675 km_policy_notify(xp, dir, &c);
2676 } else {
2677 err = key_pol_get_resp(sk, xp, hdr, dir);
2678 }
2679
2680 out:
2681 xfrm_pol_put(xp);
2682 return err;
2683 }
2684
dump_sp(struct xfrm_policy * xp,int dir,int count,void * ptr)2685 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2686 {
2687 struct pfkey_sock *pfk = ptr;
2688 struct sk_buff *out_skb;
2689 struct sadb_msg *out_hdr;
2690 int err;
2691
2692 if (!pfkey_can_dump(&pfk->sk))
2693 return -ENOBUFS;
2694
2695 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2696 if (IS_ERR(out_skb))
2697 return PTR_ERR(out_skb);
2698
2699 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2700 if (err < 0) {
2701 kfree_skb(out_skb);
2702 return err;
2703 }
2704
2705 out_hdr = (struct sadb_msg *) out_skb->data;
2706 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2707 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2708 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2709 out_hdr->sadb_msg_errno = 0;
2710 out_hdr->sadb_msg_seq = count + 1;
2711 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2712
2713 if (pfk->dump.skb)
2714 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2715 &pfk->sk, sock_net(&pfk->sk));
2716 pfk->dump.skb = out_skb;
2717
2718 return 0;
2719 }
2720
pfkey_dump_sp(struct pfkey_sock * pfk)2721 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2722 {
2723 struct net *net = sock_net(&pfk->sk);
2724 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2725 }
2726
pfkey_dump_sp_done(struct pfkey_sock * pfk)2727 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2728 {
2729 struct net *net = sock_net((struct sock *)pfk);
2730
2731 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2732 }
2733
pfkey_spddump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2734 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2735 {
2736 struct pfkey_sock *pfk = pfkey_sk(sk);
2737
2738 mutex_lock(&pfk->dump_lock);
2739 if (pfk->dump.dump != NULL) {
2740 mutex_unlock(&pfk->dump_lock);
2741 return -EBUSY;
2742 }
2743
2744 pfk->dump.msg_version = hdr->sadb_msg_version;
2745 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2746 pfk->dump.dump = pfkey_dump_sp;
2747 pfk->dump.done = pfkey_dump_sp_done;
2748 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2749 mutex_unlock(&pfk->dump_lock);
2750
2751 return pfkey_do_dump(pfk);
2752 }
2753
key_notify_policy_flush(const struct km_event * c)2754 static int key_notify_policy_flush(const struct km_event *c)
2755 {
2756 struct sk_buff *skb_out;
2757 struct sadb_msg *hdr;
2758
2759 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2760 if (!skb_out)
2761 return -ENOBUFS;
2762 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2763 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2764 hdr->sadb_msg_seq = c->seq;
2765 hdr->sadb_msg_pid = c->portid;
2766 hdr->sadb_msg_version = PF_KEY_V2;
2767 hdr->sadb_msg_errno = (uint8_t) 0;
2768 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2769 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2770 hdr->sadb_msg_reserved = 0;
2771 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2772 return 0;
2773
2774 }
2775
pfkey_spdflush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2776 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2777 {
2778 struct net *net = sock_net(sk);
2779 struct km_event c;
2780 int err, err2;
2781
2782 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2783 err2 = unicast_flush_resp(sk, hdr);
2784 if (err || err2) {
2785 if (err == -ESRCH) /* empty table - old silent behavior */
2786 return 0;
2787 return err;
2788 }
2789
2790 c.data.type = XFRM_POLICY_TYPE_MAIN;
2791 c.event = XFRM_MSG_FLUSHPOLICY;
2792 c.portid = hdr->sadb_msg_pid;
2793 c.seq = hdr->sadb_msg_seq;
2794 c.net = net;
2795 km_policy_notify(NULL, 0, &c);
2796
2797 return 0;
2798 }
2799
2800 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2801 const struct sadb_msg *hdr, void * const *ext_hdrs);
2802 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2803 [SADB_RESERVED] = pfkey_reserved,
2804 [SADB_GETSPI] = pfkey_getspi,
2805 [SADB_UPDATE] = pfkey_add,
2806 [SADB_ADD] = pfkey_add,
2807 [SADB_DELETE] = pfkey_delete,
2808 [SADB_GET] = pfkey_get,
2809 [SADB_ACQUIRE] = pfkey_acquire,
2810 [SADB_REGISTER] = pfkey_register,
2811 [SADB_EXPIRE] = NULL,
2812 [SADB_FLUSH] = pfkey_flush,
2813 [SADB_DUMP] = pfkey_dump,
2814 [SADB_X_PROMISC] = pfkey_promisc,
2815 [SADB_X_PCHANGE] = NULL,
2816 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2817 [SADB_X_SPDADD] = pfkey_spdadd,
2818 [SADB_X_SPDDELETE] = pfkey_spddelete,
2819 [SADB_X_SPDGET] = pfkey_spdget,
2820 [SADB_X_SPDACQUIRE] = NULL,
2821 [SADB_X_SPDDUMP] = pfkey_spddump,
2822 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2823 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2824 [SADB_X_SPDDELETE2] = pfkey_spdget,
2825 [SADB_X_MIGRATE] = pfkey_migrate,
2826 };
2827
pfkey_process(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr)2828 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2829 {
2830 void *ext_hdrs[SADB_EXT_MAX];
2831 int err;
2832
2833 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2834 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2835
2836 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2837 err = parse_exthdrs(skb, hdr, ext_hdrs);
2838 if (!err) {
2839 err = -EOPNOTSUPP;
2840 if (pfkey_funcs[hdr->sadb_msg_type])
2841 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2842 }
2843 return err;
2844 }
2845
pfkey_get_base_msg(struct sk_buff * skb,int * errp)2846 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2847 {
2848 struct sadb_msg *hdr = NULL;
2849
2850 if (skb->len < sizeof(*hdr)) {
2851 *errp = -EMSGSIZE;
2852 } else {
2853 hdr = (struct sadb_msg *) skb->data;
2854 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2855 hdr->sadb_msg_reserved != 0 ||
2856 (hdr->sadb_msg_type <= SADB_RESERVED ||
2857 hdr->sadb_msg_type > SADB_MAX)) {
2858 hdr = NULL;
2859 *errp = -EINVAL;
2860 } else if (hdr->sadb_msg_len != (skb->len /
2861 sizeof(uint64_t)) ||
2862 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2863 sizeof(uint64_t))) {
2864 hdr = NULL;
2865 *errp = -EMSGSIZE;
2866 } else {
2867 *errp = 0;
2868 }
2869 }
2870 return hdr;
2871 }
2872
aalg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2873 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2874 const struct xfrm_algo_desc *d)
2875 {
2876 unsigned int id = d->desc.sadb_alg_id;
2877
2878 if (id >= sizeof(t->aalgos) * 8)
2879 return 0;
2880
2881 return (t->aalgos >> id) & 1;
2882 }
2883
ealg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2884 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2885 const struct xfrm_algo_desc *d)
2886 {
2887 unsigned int id = d->desc.sadb_alg_id;
2888
2889 if (id >= sizeof(t->ealgos) * 8)
2890 return 0;
2891
2892 return (t->ealgos >> id) & 1;
2893 }
2894
count_ah_combs(const struct xfrm_tmpl * t)2895 static int count_ah_combs(const struct xfrm_tmpl *t)
2896 {
2897 int i, sz = 0;
2898
2899 for (i = 0; ; i++) {
2900 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2901 if (!aalg)
2902 break;
2903 if (!aalg->pfkey_supported)
2904 continue;
2905 if (aalg_tmpl_set(t, aalg))
2906 sz += sizeof(struct sadb_comb);
2907 }
2908 return sz + sizeof(struct sadb_prop);
2909 }
2910
count_esp_combs(const struct xfrm_tmpl * t)2911 static int count_esp_combs(const struct xfrm_tmpl *t)
2912 {
2913 int i, k, sz = 0;
2914
2915 for (i = 0; ; i++) {
2916 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2917 if (!ealg)
2918 break;
2919
2920 if (!ealg->pfkey_supported)
2921 continue;
2922
2923 if (!(ealg_tmpl_set(t, ealg)))
2924 continue;
2925
2926 for (k = 1; ; k++) {
2927 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2928 if (!aalg)
2929 break;
2930
2931 if (!aalg->pfkey_supported)
2932 continue;
2933
2934 if (aalg_tmpl_set(t, aalg))
2935 sz += sizeof(struct sadb_comb);
2936 }
2937 }
2938 return sz + sizeof(struct sadb_prop);
2939 }
2940
dump_ah_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)2941 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2942 {
2943 struct sadb_prop *p;
2944 int i;
2945
2946 p = skb_put(skb, sizeof(struct sadb_prop));
2947 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2948 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2949 p->sadb_prop_replay = 32;
2950 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2951
2952 for (i = 0; ; i++) {
2953 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2954 if (!aalg)
2955 break;
2956
2957 if (!aalg->pfkey_supported)
2958 continue;
2959
2960 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2961 struct sadb_comb *c;
2962 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2963 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2964 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2965 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2966 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2967 c->sadb_comb_hard_addtime = 24*60*60;
2968 c->sadb_comb_soft_addtime = 20*60*60;
2969 c->sadb_comb_hard_usetime = 8*60*60;
2970 c->sadb_comb_soft_usetime = 7*60*60;
2971 }
2972 }
2973 }
2974
dump_esp_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)2975 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2976 {
2977 struct sadb_prop *p;
2978 int i, k;
2979
2980 p = skb_put(skb, sizeof(struct sadb_prop));
2981 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2982 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2983 p->sadb_prop_replay = 32;
2984 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2985
2986 for (i=0; ; i++) {
2987 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2988 if (!ealg)
2989 break;
2990
2991 if (!ealg->pfkey_supported)
2992 continue;
2993
2994 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2995 continue;
2996
2997 for (k = 1; ; k++) {
2998 struct sadb_comb *c;
2999 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3000 if (!aalg)
3001 break;
3002 if (!aalg->pfkey_supported)
3003 continue;
3004 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3005 continue;
3006 c = skb_put(skb, sizeof(struct sadb_comb));
3007 memset(c, 0, sizeof(*c));
3008 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3009 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3010 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3011 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3012 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3013 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3014 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3015 c->sadb_comb_hard_addtime = 24*60*60;
3016 c->sadb_comb_soft_addtime = 20*60*60;
3017 c->sadb_comb_hard_usetime = 8*60*60;
3018 c->sadb_comb_soft_usetime = 7*60*60;
3019 }
3020 }
3021 }
3022
key_notify_policy_expire(struct xfrm_policy * xp,const struct km_event * c)3023 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3024 {
3025 return 0;
3026 }
3027
key_notify_sa_expire(struct xfrm_state * x,const struct km_event * c)3028 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3029 {
3030 struct sk_buff *out_skb;
3031 struct sadb_msg *out_hdr;
3032 int hard;
3033 int hsc;
3034
3035 hard = c->data.hard;
3036 if (hard)
3037 hsc = 2;
3038 else
3039 hsc = 1;
3040
3041 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3042 if (IS_ERR(out_skb))
3043 return PTR_ERR(out_skb);
3044
3045 out_hdr = (struct sadb_msg *) out_skb->data;
3046 out_hdr->sadb_msg_version = PF_KEY_V2;
3047 out_hdr->sadb_msg_type = SADB_EXPIRE;
3048 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3049 out_hdr->sadb_msg_errno = 0;
3050 out_hdr->sadb_msg_reserved = 0;
3051 out_hdr->sadb_msg_seq = 0;
3052 out_hdr->sadb_msg_pid = 0;
3053
3054 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3055 xs_net(x));
3056 return 0;
3057 }
3058
pfkey_send_notify(struct xfrm_state * x,const struct km_event * c)3059 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3060 {
3061 struct net *net = x ? xs_net(x) : c->net;
3062 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3063
3064 if (atomic_read(&net_pfkey->socks_nr) == 0)
3065 return 0;
3066
3067 switch (c->event) {
3068 case XFRM_MSG_EXPIRE:
3069 return key_notify_sa_expire(x, c);
3070 case XFRM_MSG_DELSA:
3071 case XFRM_MSG_NEWSA:
3072 case XFRM_MSG_UPDSA:
3073 return key_notify_sa(x, c);
3074 case XFRM_MSG_FLUSHSA:
3075 return key_notify_sa_flush(c);
3076 case XFRM_MSG_NEWAE: /* not yet supported */
3077 break;
3078 default:
3079 pr_err("pfkey: Unknown SA event %d\n", c->event);
3080 break;
3081 }
3082
3083 return 0;
3084 }
3085
pfkey_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3086 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3087 {
3088 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3089 return 0;
3090
3091 switch (c->event) {
3092 case XFRM_MSG_POLEXPIRE:
3093 return key_notify_policy_expire(xp, c);
3094 case XFRM_MSG_DELPOLICY:
3095 case XFRM_MSG_NEWPOLICY:
3096 case XFRM_MSG_UPDPOLICY:
3097 return key_notify_policy(xp, dir, c);
3098 case XFRM_MSG_FLUSHPOLICY:
3099 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3100 break;
3101 return key_notify_policy_flush(c);
3102 default:
3103 pr_err("pfkey: Unknown policy event %d\n", c->event);
3104 break;
3105 }
3106
3107 return 0;
3108 }
3109
get_acqseq(void)3110 static u32 get_acqseq(void)
3111 {
3112 u32 res;
3113 static atomic_t acqseq;
3114
3115 do {
3116 res = atomic_inc_return(&acqseq);
3117 } while (!res);
3118 return res;
3119 }
3120
pfkey_is_alive(const struct km_event * c)3121 static bool pfkey_is_alive(const struct km_event *c)
3122 {
3123 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3124 struct sock *sk;
3125 bool is_alive = false;
3126
3127 rcu_read_lock();
3128 sk_for_each_rcu(sk, &net_pfkey->table) {
3129 if (pfkey_sk(sk)->registered) {
3130 is_alive = true;
3131 break;
3132 }
3133 }
3134 rcu_read_unlock();
3135
3136 return is_alive;
3137 }
3138
pfkey_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * xp)3139 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3140 {
3141 struct sk_buff *skb;
3142 struct sadb_msg *hdr;
3143 struct sadb_address *addr;
3144 struct sadb_x_policy *pol;
3145 int sockaddr_size;
3146 int size;
3147 struct sadb_x_sec_ctx *sec_ctx;
3148 struct xfrm_sec_ctx *xfrm_ctx;
3149 int ctx_size = 0;
3150
3151 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3152 if (!sockaddr_size)
3153 return -EINVAL;
3154
3155 size = sizeof(struct sadb_msg) +
3156 (sizeof(struct sadb_address) * 2) +
3157 (sockaddr_size * 2) +
3158 sizeof(struct sadb_x_policy);
3159
3160 if (x->id.proto == IPPROTO_AH)
3161 size += count_ah_combs(t);
3162 else if (x->id.proto == IPPROTO_ESP)
3163 size += count_esp_combs(t);
3164
3165 if ((xfrm_ctx = x->security)) {
3166 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3167 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3168 }
3169
3170 skb = alloc_skb(size + 16, GFP_ATOMIC);
3171 if (skb == NULL)
3172 return -ENOMEM;
3173
3174 hdr = skb_put(skb, sizeof(struct sadb_msg));
3175 hdr->sadb_msg_version = PF_KEY_V2;
3176 hdr->sadb_msg_type = SADB_ACQUIRE;
3177 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3178 hdr->sadb_msg_len = size / sizeof(uint64_t);
3179 hdr->sadb_msg_errno = 0;
3180 hdr->sadb_msg_reserved = 0;
3181 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3182 hdr->sadb_msg_pid = 0;
3183
3184 /* src address */
3185 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3186 addr->sadb_address_len =
3187 (sizeof(struct sadb_address)+sockaddr_size)/
3188 sizeof(uint64_t);
3189 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3190 addr->sadb_address_proto = 0;
3191 addr->sadb_address_reserved = 0;
3192 addr->sadb_address_prefixlen =
3193 pfkey_sockaddr_fill(&x->props.saddr, 0,
3194 (struct sockaddr *) (addr + 1),
3195 x->props.family);
3196 if (!addr->sadb_address_prefixlen)
3197 BUG();
3198
3199 /* dst address */
3200 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3201 addr->sadb_address_len =
3202 (sizeof(struct sadb_address)+sockaddr_size)/
3203 sizeof(uint64_t);
3204 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3205 addr->sadb_address_proto = 0;
3206 addr->sadb_address_reserved = 0;
3207 addr->sadb_address_prefixlen =
3208 pfkey_sockaddr_fill(&x->id.daddr, 0,
3209 (struct sockaddr *) (addr + 1),
3210 x->props.family);
3211 if (!addr->sadb_address_prefixlen)
3212 BUG();
3213
3214 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3215 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3216 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3217 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3218 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3219 pol->sadb_x_policy_reserved = 0;
3220 pol->sadb_x_policy_id = xp->index;
3221 pol->sadb_x_policy_priority = xp->priority;
3222
3223 /* Set sadb_comb's. */
3224 if (x->id.proto == IPPROTO_AH)
3225 dump_ah_combs(skb, t);
3226 else if (x->id.proto == IPPROTO_ESP)
3227 dump_esp_combs(skb, t);
3228
3229 /* security context */
3230 if (xfrm_ctx) {
3231 sec_ctx = skb_put(skb,
3232 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3233 sec_ctx->sadb_x_sec_len =
3234 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3235 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3236 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3237 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3238 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3239 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3240 xfrm_ctx->ctx_len);
3241 }
3242
3243 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3244 xs_net(x));
3245 }
3246
pfkey_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3247 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3248 u8 *data, int len, int *dir)
3249 {
3250 struct net *net = sock_net(sk);
3251 struct xfrm_policy *xp;
3252 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3253 struct sadb_x_sec_ctx *sec_ctx;
3254
3255 switch (sk->sk_family) {
3256 case AF_INET:
3257 if (opt != IP_IPSEC_POLICY) {
3258 *dir = -EOPNOTSUPP;
3259 return NULL;
3260 }
3261 break;
3262 #if IS_ENABLED(CONFIG_IPV6)
3263 case AF_INET6:
3264 if (opt != IPV6_IPSEC_POLICY) {
3265 *dir = -EOPNOTSUPP;
3266 return NULL;
3267 }
3268 break;
3269 #endif
3270 default:
3271 *dir = -EINVAL;
3272 return NULL;
3273 }
3274
3275 *dir = -EINVAL;
3276
3277 if (len < sizeof(struct sadb_x_policy) ||
3278 pol->sadb_x_policy_len*8 > len ||
3279 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3280 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3281 return NULL;
3282
3283 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3284 if (xp == NULL) {
3285 *dir = -ENOBUFS;
3286 return NULL;
3287 }
3288
3289 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3290 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3291
3292 xp->lft.soft_byte_limit = XFRM_INF;
3293 xp->lft.hard_byte_limit = XFRM_INF;
3294 xp->lft.soft_packet_limit = XFRM_INF;
3295 xp->lft.hard_packet_limit = XFRM_INF;
3296 xp->family = sk->sk_family;
3297
3298 xp->xfrm_nr = 0;
3299 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3300 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3301 goto out;
3302
3303 /* security context too */
3304 if (len >= (pol->sadb_x_policy_len*8 +
3305 sizeof(struct sadb_x_sec_ctx))) {
3306 char *p = (char *)pol;
3307 struct xfrm_user_sec_ctx *uctx;
3308
3309 p += pol->sadb_x_policy_len*8;
3310 sec_ctx = (struct sadb_x_sec_ctx *)p;
3311 if (len < pol->sadb_x_policy_len*8 +
3312 sec_ctx->sadb_x_sec_len*8) {
3313 *dir = -EINVAL;
3314 goto out;
3315 }
3316 if ((*dir = verify_sec_ctx_len(p)))
3317 goto out;
3318 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3319 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3320 kfree(uctx);
3321
3322 if (*dir)
3323 goto out;
3324 }
3325
3326 *dir = pol->sadb_x_policy_dir-1;
3327 return xp;
3328
3329 out:
3330 xp->walk.dead = 1;
3331 xfrm_policy_destroy(xp);
3332 return NULL;
3333 }
3334
pfkey_send_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3335 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3336 {
3337 struct sk_buff *skb;
3338 struct sadb_msg *hdr;
3339 struct sadb_sa *sa;
3340 struct sadb_address *addr;
3341 struct sadb_x_nat_t_port *n_port;
3342 int sockaddr_size;
3343 int size;
3344 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3345 struct xfrm_encap_tmpl *natt = NULL;
3346
3347 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3348 if (!sockaddr_size)
3349 return -EINVAL;
3350
3351 if (!satype)
3352 return -EINVAL;
3353
3354 if (!x->encap)
3355 return -EINVAL;
3356
3357 natt = x->encap;
3358
3359 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3360 *
3361 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3362 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3363 */
3364
3365 size = sizeof(struct sadb_msg) +
3366 sizeof(struct sadb_sa) +
3367 (sizeof(struct sadb_address) * 2) +
3368 (sockaddr_size * 2) +
3369 (sizeof(struct sadb_x_nat_t_port) * 2);
3370
3371 skb = alloc_skb(size + 16, GFP_ATOMIC);
3372 if (skb == NULL)
3373 return -ENOMEM;
3374
3375 hdr = skb_put(skb, sizeof(struct sadb_msg));
3376 hdr->sadb_msg_version = PF_KEY_V2;
3377 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3378 hdr->sadb_msg_satype = satype;
3379 hdr->sadb_msg_len = size / sizeof(uint64_t);
3380 hdr->sadb_msg_errno = 0;
3381 hdr->sadb_msg_reserved = 0;
3382 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3383 hdr->sadb_msg_pid = 0;
3384
3385 /* SA */
3386 sa = skb_put(skb, sizeof(struct sadb_sa));
3387 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3388 sa->sadb_sa_exttype = SADB_EXT_SA;
3389 sa->sadb_sa_spi = x->id.spi;
3390 sa->sadb_sa_replay = 0;
3391 sa->sadb_sa_state = 0;
3392 sa->sadb_sa_auth = 0;
3393 sa->sadb_sa_encrypt = 0;
3394 sa->sadb_sa_flags = 0;
3395
3396 /* ADDRESS_SRC (old addr) */
3397 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3398 addr->sadb_address_len =
3399 (sizeof(struct sadb_address)+sockaddr_size)/
3400 sizeof(uint64_t);
3401 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3402 addr->sadb_address_proto = 0;
3403 addr->sadb_address_reserved = 0;
3404 addr->sadb_address_prefixlen =
3405 pfkey_sockaddr_fill(&x->props.saddr, 0,
3406 (struct sockaddr *) (addr + 1),
3407 x->props.family);
3408 if (!addr->sadb_address_prefixlen)
3409 BUG();
3410
3411 /* NAT_T_SPORT (old port) */
3412 n_port = skb_put(skb, sizeof(*n_port));
3413 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3414 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3415 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3416 n_port->sadb_x_nat_t_port_reserved = 0;
3417
3418 /* ADDRESS_DST (new addr) */
3419 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3420 addr->sadb_address_len =
3421 (sizeof(struct sadb_address)+sockaddr_size)/
3422 sizeof(uint64_t);
3423 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3424 addr->sadb_address_proto = 0;
3425 addr->sadb_address_reserved = 0;
3426 addr->sadb_address_prefixlen =
3427 pfkey_sockaddr_fill(ipaddr, 0,
3428 (struct sockaddr *) (addr + 1),
3429 x->props.family);
3430 if (!addr->sadb_address_prefixlen)
3431 BUG();
3432
3433 /* NAT_T_DPORT (new port) */
3434 n_port = skb_put(skb, sizeof(*n_port));
3435 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3436 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3437 n_port->sadb_x_nat_t_port_port = sport;
3438 n_port->sadb_x_nat_t_port_reserved = 0;
3439
3440 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3441 xs_net(x));
3442 }
3443
3444 #ifdef CONFIG_NET_KEY_MIGRATE
set_sadb_address(struct sk_buff * skb,int sasize,int type,const struct xfrm_selector * sel)3445 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3446 const struct xfrm_selector *sel)
3447 {
3448 struct sadb_address *addr;
3449 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3450 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3451 addr->sadb_address_exttype = type;
3452 addr->sadb_address_proto = sel->proto;
3453 addr->sadb_address_reserved = 0;
3454
3455 switch (type) {
3456 case SADB_EXT_ADDRESS_SRC:
3457 addr->sadb_address_prefixlen = sel->prefixlen_s;
3458 pfkey_sockaddr_fill(&sel->saddr, 0,
3459 (struct sockaddr *)(addr + 1),
3460 sel->family);
3461 break;
3462 case SADB_EXT_ADDRESS_DST:
3463 addr->sadb_address_prefixlen = sel->prefixlen_d;
3464 pfkey_sockaddr_fill(&sel->daddr, 0,
3465 (struct sockaddr *)(addr + 1),
3466 sel->family);
3467 break;
3468 default:
3469 return -EINVAL;
3470 }
3471
3472 return 0;
3473 }
3474
3475
set_sadb_kmaddress(struct sk_buff * skb,const struct xfrm_kmaddress * k)3476 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3477 {
3478 struct sadb_x_kmaddress *kma;
3479 u8 *sa;
3480 int family = k->family;
3481 int socklen = pfkey_sockaddr_len(family);
3482 int size_req;
3483
3484 size_req = (sizeof(struct sadb_x_kmaddress) +
3485 pfkey_sockaddr_pair_size(family));
3486
3487 kma = skb_put_zero(skb, size_req);
3488 kma->sadb_x_kmaddress_len = size_req / 8;
3489 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3490 kma->sadb_x_kmaddress_reserved = k->reserved;
3491
3492 sa = (u8 *)(kma + 1);
3493 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3494 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3495 return -EINVAL;
3496
3497 return 0;
3498 }
3499
set_ipsecrequest(struct sk_buff * skb,uint8_t proto,uint8_t mode,int level,uint32_t reqid,uint8_t family,const xfrm_address_t * src,const xfrm_address_t * dst)3500 static int set_ipsecrequest(struct sk_buff *skb,
3501 uint8_t proto, uint8_t mode, int level,
3502 uint32_t reqid, uint8_t family,
3503 const xfrm_address_t *src, const xfrm_address_t *dst)
3504 {
3505 struct sadb_x_ipsecrequest *rq;
3506 u8 *sa;
3507 int socklen = pfkey_sockaddr_len(family);
3508 int size_req;
3509
3510 size_req = sizeof(struct sadb_x_ipsecrequest) +
3511 pfkey_sockaddr_pair_size(family);
3512
3513 rq = skb_put_zero(skb, size_req);
3514 rq->sadb_x_ipsecrequest_len = size_req;
3515 rq->sadb_x_ipsecrequest_proto = proto;
3516 rq->sadb_x_ipsecrequest_mode = mode;
3517 rq->sadb_x_ipsecrequest_level = level;
3518 rq->sadb_x_ipsecrequest_reqid = reqid;
3519
3520 sa = (u8 *) (rq + 1);
3521 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3522 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3523 return -EINVAL;
3524
3525 return 0;
3526 }
3527 #endif
3528
3529 #ifdef CONFIG_NET_KEY_MIGRATE
pfkey_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_bundles,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3530 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3531 const struct xfrm_migrate *m, int num_bundles,
3532 const struct xfrm_kmaddress *k,
3533 const struct xfrm_encap_tmpl *encap)
3534 {
3535 int i;
3536 int sasize_sel;
3537 int size = 0;
3538 int size_pol = 0;
3539 struct sk_buff *skb;
3540 struct sadb_msg *hdr;
3541 struct sadb_x_policy *pol;
3542 const struct xfrm_migrate *mp;
3543
3544 if (type != XFRM_POLICY_TYPE_MAIN)
3545 return 0;
3546
3547 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3548 return -EINVAL;
3549
3550 if (k != NULL) {
3551 /* addresses for KM */
3552 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3553 pfkey_sockaddr_pair_size(k->family));
3554 }
3555
3556 /* selector */
3557 sasize_sel = pfkey_sockaddr_size(sel->family);
3558 if (!sasize_sel)
3559 return -EINVAL;
3560 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3561
3562 /* policy info */
3563 size_pol += sizeof(struct sadb_x_policy);
3564
3565 /* ipsecrequests */
3566 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3567 /* old locator pair */
3568 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3569 pfkey_sockaddr_pair_size(mp->old_family);
3570 /* new locator pair */
3571 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3572 pfkey_sockaddr_pair_size(mp->new_family);
3573 }
3574
3575 size += sizeof(struct sadb_msg) + size_pol;
3576
3577 /* alloc buffer */
3578 skb = alloc_skb(size, GFP_ATOMIC);
3579 if (skb == NULL)
3580 return -ENOMEM;
3581
3582 hdr = skb_put(skb, sizeof(struct sadb_msg));
3583 hdr->sadb_msg_version = PF_KEY_V2;
3584 hdr->sadb_msg_type = SADB_X_MIGRATE;
3585 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3586 hdr->sadb_msg_len = size / 8;
3587 hdr->sadb_msg_errno = 0;
3588 hdr->sadb_msg_reserved = 0;
3589 hdr->sadb_msg_seq = 0;
3590 hdr->sadb_msg_pid = 0;
3591
3592 /* Addresses to be used by KM for negotiation, if ext is available */
3593 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3594 goto err;
3595
3596 /* selector src */
3597 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3598
3599 /* selector dst */
3600 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3601
3602 /* policy information */
3603 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3604 pol->sadb_x_policy_len = size_pol / 8;
3605 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3606 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3607 pol->sadb_x_policy_dir = dir + 1;
3608 pol->sadb_x_policy_reserved = 0;
3609 pol->sadb_x_policy_id = 0;
3610 pol->sadb_x_policy_priority = 0;
3611
3612 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3613 /* old ipsecrequest */
3614 int mode = pfkey_mode_from_xfrm(mp->mode);
3615 if (mode < 0)
3616 goto err;
3617 if (set_ipsecrequest(skb, mp->proto, mode,
3618 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3619 mp->reqid, mp->old_family,
3620 &mp->old_saddr, &mp->old_daddr) < 0)
3621 goto err;
3622
3623 /* new ipsecrequest */
3624 if (set_ipsecrequest(skb, mp->proto, mode,
3625 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3626 mp->reqid, mp->new_family,
3627 &mp->new_saddr, &mp->new_daddr) < 0)
3628 goto err;
3629 }
3630
3631 /* broadcast migrate message to sockets */
3632 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3633
3634 return 0;
3635
3636 err:
3637 kfree_skb(skb);
3638 return -EINVAL;
3639 }
3640 #else
pfkey_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_bundles,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)3641 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3642 const struct xfrm_migrate *m, int num_bundles,
3643 const struct xfrm_kmaddress *k,
3644 const struct xfrm_encap_tmpl *encap)
3645 {
3646 return -ENOPROTOOPT;
3647 }
3648 #endif
3649
pfkey_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)3650 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3651 {
3652 struct sock *sk = sock->sk;
3653 struct sk_buff *skb = NULL;
3654 struct sadb_msg *hdr = NULL;
3655 int err;
3656 struct net *net = sock_net(sk);
3657
3658 err = -EOPNOTSUPP;
3659 if (msg->msg_flags & MSG_OOB)
3660 goto out;
3661
3662 err = -EMSGSIZE;
3663 if ((unsigned int)len > sk->sk_sndbuf - 32)
3664 goto out;
3665
3666 err = -ENOBUFS;
3667 skb = alloc_skb(len, GFP_KERNEL);
3668 if (skb == NULL)
3669 goto out;
3670
3671 err = -EFAULT;
3672 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3673 goto out;
3674
3675 hdr = pfkey_get_base_msg(skb, &err);
3676 if (!hdr)
3677 goto out;
3678
3679 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3680 err = pfkey_process(sk, skb, hdr);
3681 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3682
3683 out:
3684 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3685 err = 0;
3686 kfree_skb(skb);
3687
3688 return err ? : len;
3689 }
3690
pfkey_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)3691 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3692 int flags)
3693 {
3694 struct sock *sk = sock->sk;
3695 struct pfkey_sock *pfk = pfkey_sk(sk);
3696 struct sk_buff *skb;
3697 int copied, err;
3698
3699 err = -EINVAL;
3700 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3701 goto out;
3702
3703 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3704 if (skb == NULL)
3705 goto out;
3706
3707 copied = skb->len;
3708 if (copied > len) {
3709 msg->msg_flags |= MSG_TRUNC;
3710 copied = len;
3711 }
3712
3713 skb_reset_transport_header(skb);
3714 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3715 if (err)
3716 goto out_free;
3717
3718 sock_recv_ts_and_drops(msg, sk, skb);
3719
3720 err = (flags & MSG_TRUNC) ? skb->len : copied;
3721
3722 if (pfk->dump.dump != NULL &&
3723 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3724 pfkey_do_dump(pfk);
3725
3726 out_free:
3727 skb_free_datagram(sk, skb);
3728 out:
3729 return err;
3730 }
3731
3732 static const struct proto_ops pfkey_ops = {
3733 .family = PF_KEY,
3734 .owner = THIS_MODULE,
3735 /* Operations that make no sense on pfkey sockets. */
3736 .bind = sock_no_bind,
3737 .connect = sock_no_connect,
3738 .socketpair = sock_no_socketpair,
3739 .accept = sock_no_accept,
3740 .getname = sock_no_getname,
3741 .ioctl = sock_no_ioctl,
3742 .listen = sock_no_listen,
3743 .shutdown = sock_no_shutdown,
3744 .mmap = sock_no_mmap,
3745 .sendpage = sock_no_sendpage,
3746
3747 /* Now the operations that really occur. */
3748 .release = pfkey_release,
3749 .poll = datagram_poll,
3750 .sendmsg = pfkey_sendmsg,
3751 .recvmsg = pfkey_recvmsg,
3752 };
3753
3754 static const struct net_proto_family pfkey_family_ops = {
3755 .family = PF_KEY,
3756 .create = pfkey_create,
3757 .owner = THIS_MODULE,
3758 };
3759
3760 #ifdef CONFIG_PROC_FS
pfkey_seq_show(struct seq_file * f,void * v)3761 static int pfkey_seq_show(struct seq_file *f, void *v)
3762 {
3763 struct sock *s = sk_entry(v);
3764
3765 if (v == SEQ_START_TOKEN)
3766 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3767 else
3768 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3769 s,
3770 refcount_read(&s->sk_refcnt),
3771 sk_rmem_alloc_get(s),
3772 sk_wmem_alloc_get(s),
3773 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3774 sock_i_ino(s)
3775 );
3776 return 0;
3777 }
3778
pfkey_seq_start(struct seq_file * f,loff_t * ppos)3779 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3780 __acquires(rcu)
3781 {
3782 struct net *net = seq_file_net(f);
3783 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3784
3785 rcu_read_lock();
3786 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3787 }
3788
pfkey_seq_next(struct seq_file * f,void * v,loff_t * ppos)3789 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3790 {
3791 struct net *net = seq_file_net(f);
3792 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3793
3794 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3795 }
3796
pfkey_seq_stop(struct seq_file * f,void * v)3797 static void pfkey_seq_stop(struct seq_file *f, void *v)
3798 __releases(rcu)
3799 {
3800 rcu_read_unlock();
3801 }
3802
3803 static const struct seq_operations pfkey_seq_ops = {
3804 .start = pfkey_seq_start,
3805 .next = pfkey_seq_next,
3806 .stop = pfkey_seq_stop,
3807 .show = pfkey_seq_show,
3808 };
3809
pfkey_init_proc(struct net * net)3810 static int __net_init pfkey_init_proc(struct net *net)
3811 {
3812 struct proc_dir_entry *e;
3813
3814 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3815 sizeof(struct seq_net_private));
3816 if (e == NULL)
3817 return -ENOMEM;
3818
3819 return 0;
3820 }
3821
pfkey_exit_proc(struct net * net)3822 static void __net_exit pfkey_exit_proc(struct net *net)
3823 {
3824 remove_proc_entry("pfkey", net->proc_net);
3825 }
3826 #else
pfkey_init_proc(struct net * net)3827 static inline int pfkey_init_proc(struct net *net)
3828 {
3829 return 0;
3830 }
3831
pfkey_exit_proc(struct net * net)3832 static inline void pfkey_exit_proc(struct net *net)
3833 {
3834 }
3835 #endif
3836
3837 static struct xfrm_mgr pfkeyv2_mgr =
3838 {
3839 .notify = pfkey_send_notify,
3840 .acquire = pfkey_send_acquire,
3841 .compile_policy = pfkey_compile_policy,
3842 .new_mapping = pfkey_send_new_mapping,
3843 .notify_policy = pfkey_send_policy_notify,
3844 .migrate = pfkey_send_migrate,
3845 .is_alive = pfkey_is_alive,
3846 };
3847
pfkey_net_init(struct net * net)3848 static int __net_init pfkey_net_init(struct net *net)
3849 {
3850 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3851 int rv;
3852
3853 INIT_HLIST_HEAD(&net_pfkey->table);
3854 atomic_set(&net_pfkey->socks_nr, 0);
3855
3856 rv = pfkey_init_proc(net);
3857
3858 return rv;
3859 }
3860
pfkey_net_exit(struct net * net)3861 static void __net_exit pfkey_net_exit(struct net *net)
3862 {
3863 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3864
3865 pfkey_exit_proc(net);
3866 WARN_ON(!hlist_empty(&net_pfkey->table));
3867 }
3868
3869 static struct pernet_operations pfkey_net_ops = {
3870 .init = pfkey_net_init,
3871 .exit = pfkey_net_exit,
3872 .id = &pfkey_net_id,
3873 .size = sizeof(struct netns_pfkey),
3874 };
3875
ipsec_pfkey_exit(void)3876 static void __exit ipsec_pfkey_exit(void)
3877 {
3878 xfrm_unregister_km(&pfkeyv2_mgr);
3879 sock_unregister(PF_KEY);
3880 unregister_pernet_subsys(&pfkey_net_ops);
3881 proto_unregister(&key_proto);
3882 }
3883
ipsec_pfkey_init(void)3884 static int __init ipsec_pfkey_init(void)
3885 {
3886 int err = proto_register(&key_proto, 0);
3887
3888 if (err != 0)
3889 goto out;
3890
3891 err = register_pernet_subsys(&pfkey_net_ops);
3892 if (err != 0)
3893 goto out_unregister_key_proto;
3894 err = sock_register(&pfkey_family_ops);
3895 if (err != 0)
3896 goto out_unregister_pernet;
3897 err = xfrm_register_km(&pfkeyv2_mgr);
3898 if (err != 0)
3899 goto out_sock_unregister;
3900 out:
3901 return err;
3902
3903 out_sock_unregister:
3904 sock_unregister(PF_KEY);
3905 out_unregister_pernet:
3906 unregister_pernet_subsys(&pfkey_net_ops);
3907 out_unregister_key_proto:
3908 proto_unregister(&key_proto);
3909 goto out;
3910 }
3911
3912 module_init(ipsec_pfkey_init);
3913 module_exit(ipsec_pfkey_exit);
3914 MODULE_LICENSE("GPL");
3915 MODULE_ALIAS_NETPROTO(PF_KEY);
3916