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
145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
146 return -EPERM;
147 if (sock->type != SOCK_RAW)
148 return -ESOCKTNOSUPPORT;
149 if (protocol != PF_KEY_V2)
150 return -EPROTONOSUPPORT;
151
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
153 if (sk == NULL)
154 return -ENOMEM;
155
156 pfk = pfkey_sk(sk);
157 mutex_init(&pfk->dump_lock);
158
159 sock->ops = &pfkey_ops;
160 sock_init_data(sock, sk);
161
162 sk->sk_family = PF_KEY;
163 sk->sk_destruct = pfkey_sock_destruct;
164
165 atomic_inc(&net_pfkey->socks_nr);
166
167 pfkey_insert(sk);
168
169 return 0;
170 }
171
pfkey_release(struct socket * sock)172 static int pfkey_release(struct socket *sock)
173 {
174 struct sock *sk = sock->sk;
175
176 if (!sk)
177 return 0;
178
179 pfkey_remove(sk);
180
181 sock_orphan(sk);
182 sock->sk = NULL;
183 skb_queue_purge(&sk->sk_write_queue);
184
185 synchronize_rcu();
186 sock_put(sk);
187
188 return 0;
189 }
190
pfkey_broadcast_one(struct sk_buff * skb,gfp_t allocation,struct sock * sk)191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
192 struct sock *sk)
193 {
194 int err = -ENOBUFS;
195
196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
197 return err;
198
199 skb = skb_clone(skb, allocation);
200
201 if (skb) {
202 skb_set_owner_r(skb, sk);
203 skb_queue_tail(&sk->sk_receive_queue, skb);
204 sk->sk_data_ready(sk);
205 err = 0;
206 }
207 return err;
208 }
209
210 /* Send SKB to all pfkey sockets matching selected criteria. */
211 #define BROADCAST_ALL 0
212 #define BROADCAST_ONE 1
213 #define BROADCAST_REGISTERED 2
214 #define BROADCAST_PROMISC_ONLY 4
pfkey_broadcast(struct sk_buff * skb,gfp_t allocation,int broadcast_flags,struct sock * one_sk,struct net * net)215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
216 int broadcast_flags, struct sock *one_sk,
217 struct net *net)
218 {
219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
220 struct sock *sk;
221 int err = -ESRCH;
222
223 /* XXX Do we need something like netlink_overrun? I think
224 * XXX PF_KEY socket apps will not mind current behavior.
225 */
226 if (!skb)
227 return -ENOMEM;
228
229 rcu_read_lock();
230 sk_for_each_rcu(sk, &net_pfkey->table) {
231 struct pfkey_sock *pfk = pfkey_sk(sk);
232 int err2;
233
234 /* Yes, it means that if you are meant to receive this
235 * pfkey message you receive it twice as promiscuous
236 * socket.
237 */
238 if (pfk->promisc)
239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
240
241 /* the exact target will be processed later */
242 if (sk == one_sk)
243 continue;
244 if (broadcast_flags != BROADCAST_ALL) {
245 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
246 continue;
247 if ((broadcast_flags & BROADCAST_REGISTERED) &&
248 !pfk->registered)
249 continue;
250 if (broadcast_flags & BROADCAST_ONE)
251 continue;
252 }
253
254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
255
256 /* Error is cleared after successful sending to at least one
257 * registered KM */
258 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
259 err = err2;
260 }
261 rcu_read_unlock();
262
263 if (one_sk != NULL)
264 err = pfkey_broadcast_one(skb, allocation, one_sk);
265
266 kfree_skb(skb);
267 return err;
268 }
269
pfkey_do_dump(struct pfkey_sock * pfk)270 static int pfkey_do_dump(struct pfkey_sock *pfk)
271 {
272 struct sadb_msg *hdr;
273 int rc;
274
275 mutex_lock(&pfk->dump_lock);
276 if (!pfk->dump.dump) {
277 rc = 0;
278 goto out;
279 }
280
281 rc = pfk->dump.dump(pfk);
282 if (rc == -ENOBUFS) {
283 rc = 0;
284 goto out;
285 }
286
287 if (pfk->dump.skb) {
288 if (!pfkey_can_dump(&pfk->sk)) {
289 rc = 0;
290 goto out;
291 }
292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 &pfk->sk, sock_net(&pfk->sk));
298 pfk->dump.skb = NULL;
299 }
300
301 pfkey_terminate_dump(pfk);
302
303 out:
304 mutex_unlock(&pfk->dump_lock);
305 return rc;
306 }
307
pfkey_hdr_dup(struct sadb_msg * new,const struct sadb_msg * orig)308 static inline void pfkey_hdr_dup(struct sadb_msg *new,
309 const struct sadb_msg *orig)
310 {
311 *new = *orig;
312 }
313
pfkey_error(const struct sadb_msg * orig,int err,struct sock * sk)314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
315 {
316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
317 struct sadb_msg *hdr;
318
319 if (!skb)
320 return -ENOBUFS;
321
322 /* Woe be to the platform trying to support PFKEY yet
323 * having normal errnos outside the 1-255 range, inclusive.
324 */
325 err = -err;
326 if (err == ERESTARTSYS ||
327 err == ERESTARTNOHAND ||
328 err == ERESTARTNOINTR)
329 err = EINTR;
330 if (err >= 512)
331 err = EINVAL;
332 BUG_ON(err <= 0 || err >= 256);
333
334 hdr = skb_put(skb, sizeof(struct sadb_msg));
335 pfkey_hdr_dup(hdr, orig);
336 hdr->sadb_msg_errno = (uint8_t) err;
337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
338 sizeof(uint64_t));
339
340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
341
342 return 0;
343 }
344
345 static const u8 sadb_ext_min_len[] = {
346 [SADB_EXT_RESERVED] = (u8) 0,
347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
373 };
374
375 /* Verify sadb_address_{len,prefixlen} against sa_family. */
verify_address_len(const void * p)376 static int verify_address_len(const void *p)
377 {
378 const struct sadb_address *sp = p;
379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
380 const struct sockaddr_in *sin;
381 #if IS_ENABLED(CONFIG_IPV6)
382 const struct sockaddr_in6 *sin6;
383 #endif
384 int len;
385
386 if (sp->sadb_address_len <
387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
388 sizeof(uint64_t)))
389 return -EINVAL;
390
391 switch (addr->sa_family) {
392 case AF_INET:
393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
394 if (sp->sadb_address_len != len ||
395 sp->sadb_address_prefixlen > 32)
396 return -EINVAL;
397 break;
398 #if IS_ENABLED(CONFIG_IPV6)
399 case AF_INET6:
400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
401 if (sp->sadb_address_len != len ||
402 sp->sadb_address_prefixlen > 128)
403 return -EINVAL;
404 break;
405 #endif
406 default:
407 /* It is user using kernel to keep track of security
408 * associations for another protocol, such as
409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
410 * lengths.
411 *
412 * XXX Actually, association/policy database is not yet
413 * XXX able to cope with arbitrary sockaddr families.
414 * XXX When it can, remove this -EINVAL. -DaveM
415 */
416 return -EINVAL;
417 }
418
419 return 0;
420 }
421
sadb_key_len(const struct sadb_key * key)422 static inline int sadb_key_len(const struct sadb_key *key)
423 {
424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
425
426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
427 sizeof(uint64_t));
428 }
429
verify_key_len(const void * p)430 static int verify_key_len(const void *p)
431 {
432 const struct sadb_key *key = p;
433
434 if (sadb_key_len(key) > key->sadb_key_len)
435 return -EINVAL;
436
437 return 0;
438 }
439
pfkey_sec_ctx_len(const struct sadb_x_sec_ctx * sec_ctx)440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
441 {
442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 sec_ctx->sadb_x_ctx_len,
444 sizeof(uint64_t));
445 }
446
verify_sec_ctx_len(const void * p)447 static inline int verify_sec_ctx_len(const void *p)
448 {
449 const struct sadb_x_sec_ctx *sec_ctx = p;
450 int len = sec_ctx->sadb_x_ctx_len;
451
452 if (len > PAGE_SIZE)
453 return -EINVAL;
454
455 len = pfkey_sec_ctx_len(sec_ctx);
456
457 if (sec_ctx->sadb_x_sec_len != len)
458 return -EINVAL;
459
460 return 0;
461 }
462
pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx * sec_ctx,gfp_t gfp)463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 gfp_t gfp)
465 {
466 struct xfrm_user_sec_ctx *uctx = NULL;
467 int ctx_size = sec_ctx->sadb_x_ctx_len;
468
469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
470
471 if (!uctx)
472 return NULL;
473
474 uctx->len = pfkey_sec_ctx_len(sec_ctx);
475 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
479 memcpy(uctx + 1, sec_ctx + 1,
480 uctx->ctx_len);
481
482 return uctx;
483 }
484
present_and_same_family(const struct sadb_address * src,const struct sadb_address * dst)485 static int present_and_same_family(const struct sadb_address *src,
486 const struct sadb_address *dst)
487 {
488 const struct sockaddr *s_addr, *d_addr;
489
490 if (!src || !dst)
491 return 0;
492
493 s_addr = (const struct sockaddr *)(src + 1);
494 d_addr = (const struct sockaddr *)(dst + 1);
495 if (s_addr->sa_family != d_addr->sa_family)
496 return 0;
497 if (s_addr->sa_family != AF_INET
498 #if IS_ENABLED(CONFIG_IPV6)
499 && s_addr->sa_family != AF_INET6
500 #endif
501 )
502 return 0;
503
504 return 1;
505 }
506
parse_exthdrs(struct sk_buff * skb,const struct sadb_msg * hdr,void ** ext_hdrs)507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
508 {
509 const char *p = (char *) hdr;
510 int len = skb->len;
511
512 len -= sizeof(*hdr);
513 p += sizeof(*hdr);
514 while (len > 0) {
515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
516 uint16_t ext_type;
517 int ext_len;
518
519 if (len < sizeof(*ehdr))
520 return -EINVAL;
521
522 ext_len = ehdr->sadb_ext_len;
523 ext_len *= sizeof(uint64_t);
524 ext_type = ehdr->sadb_ext_type;
525 if (ext_len < sizeof(uint64_t) ||
526 ext_len > len ||
527 ext_type == SADB_EXT_RESERVED)
528 return -EINVAL;
529
530 if (ext_type <= SADB_EXT_MAX) {
531 int min = (int) sadb_ext_min_len[ext_type];
532 if (ext_len < min)
533 return -EINVAL;
534 if (ext_hdrs[ext_type-1] != NULL)
535 return -EINVAL;
536 switch (ext_type) {
537 case SADB_EXT_ADDRESS_SRC:
538 case SADB_EXT_ADDRESS_DST:
539 case SADB_EXT_ADDRESS_PROXY:
540 case SADB_X_EXT_NAT_T_OA:
541 if (verify_address_len(p))
542 return -EINVAL;
543 break;
544 case SADB_X_EXT_SEC_CTX:
545 if (verify_sec_ctx_len(p))
546 return -EINVAL;
547 break;
548 case SADB_EXT_KEY_AUTH:
549 case SADB_EXT_KEY_ENCRYPT:
550 if (verify_key_len(p))
551 return -EINVAL;
552 break;
553 default:
554 break;
555 }
556 ext_hdrs[ext_type-1] = (void *) p;
557 }
558 p += ext_len;
559 len -= ext_len;
560 }
561
562 return 0;
563 }
564
565 static uint16_t
pfkey_satype2proto(uint8_t satype)566 pfkey_satype2proto(uint8_t satype)
567 {
568 switch (satype) {
569 case SADB_SATYPE_UNSPEC:
570 return IPSEC_PROTO_ANY;
571 case SADB_SATYPE_AH:
572 return IPPROTO_AH;
573 case SADB_SATYPE_ESP:
574 return IPPROTO_ESP;
575 case SADB_X_SATYPE_IPCOMP:
576 return IPPROTO_COMP;
577 default:
578 return 0;
579 }
580 /* NOTREACHED */
581 }
582
583 static uint8_t
pfkey_proto2satype(uint16_t proto)584 pfkey_proto2satype(uint16_t proto)
585 {
586 switch (proto) {
587 case IPPROTO_AH:
588 return SADB_SATYPE_AH;
589 case IPPROTO_ESP:
590 return SADB_SATYPE_ESP;
591 case IPPROTO_COMP:
592 return SADB_X_SATYPE_IPCOMP;
593 default:
594 return 0;
595 }
596 /* NOTREACHED */
597 }
598
599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
600 * say specifically 'just raw sockets' as we encode them as 255.
601 */
602
pfkey_proto_to_xfrm(uint8_t proto)603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
604 {
605 return proto == IPSEC_PROTO_ANY ? 0 : proto;
606 }
607
pfkey_proto_from_xfrm(uint8_t proto)608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
609 {
610 return proto ? proto : IPSEC_PROTO_ANY;
611 }
612
pfkey_sockaddr_len(sa_family_t family)613 static inline int pfkey_sockaddr_len(sa_family_t family)
614 {
615 switch (family) {
616 case AF_INET:
617 return sizeof(struct sockaddr_in);
618 #if IS_ENABLED(CONFIG_IPV6)
619 case AF_INET6:
620 return sizeof(struct sockaddr_in6);
621 #endif
622 }
623 return 0;
624 }
625
626 static
pfkey_sockaddr_extract(const struct sockaddr * sa,xfrm_address_t * xaddr)627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
628 {
629 switch (sa->sa_family) {
630 case AF_INET:
631 xaddr->a4 =
632 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
633 return AF_INET;
634 #if IS_ENABLED(CONFIG_IPV6)
635 case AF_INET6:
636 memcpy(xaddr->a6,
637 &((struct sockaddr_in6 *)sa)->sin6_addr,
638 sizeof(struct in6_addr));
639 return AF_INET6;
640 #endif
641 }
642 return 0;
643 }
644
645 static
pfkey_sadb_addr2xfrm_addr(const struct sadb_address * addr,xfrm_address_t * xaddr)646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
647 {
648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
649 xaddr);
650 }
651
pfkey_xfrm_state_lookup(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)652 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
653 {
654 const struct sadb_sa *sa;
655 const struct sadb_address *addr;
656 uint16_t proto;
657 unsigned short family;
658 xfrm_address_t *xaddr;
659
660 sa = ext_hdrs[SADB_EXT_SA - 1];
661 if (sa == NULL)
662 return NULL;
663
664 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
665 if (proto == 0)
666 return NULL;
667
668 /* sadb_address_len should be checked by caller */
669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
670 if (addr == NULL)
671 return NULL;
672
673 family = ((const struct sockaddr *)(addr + 1))->sa_family;
674 switch (family) {
675 case AF_INET:
676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
677 break;
678 #if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
681 break;
682 #endif
683 default:
684 xaddr = NULL;
685 }
686
687 if (!xaddr)
688 return NULL;
689
690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
691 }
692
693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
694
695 static int
pfkey_sockaddr_size(sa_family_t family)696 pfkey_sockaddr_size(sa_family_t family)
697 {
698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
699 }
700
pfkey_mode_from_xfrm(int mode)701 static inline int pfkey_mode_from_xfrm(int mode)
702 {
703 switch(mode) {
704 case XFRM_MODE_TRANSPORT:
705 return IPSEC_MODE_TRANSPORT;
706 case XFRM_MODE_TUNNEL:
707 return IPSEC_MODE_TUNNEL;
708 case XFRM_MODE_BEET:
709 return IPSEC_MODE_BEET;
710 default:
711 return -1;
712 }
713 }
714
pfkey_mode_to_xfrm(int mode)715 static inline int pfkey_mode_to_xfrm(int mode)
716 {
717 switch(mode) {
718 case IPSEC_MODE_ANY: /*XXX*/
719 case IPSEC_MODE_TRANSPORT:
720 return XFRM_MODE_TRANSPORT;
721 case IPSEC_MODE_TUNNEL:
722 return XFRM_MODE_TUNNEL;
723 case IPSEC_MODE_BEET:
724 return XFRM_MODE_BEET;
725 default:
726 return -1;
727 }
728 }
729
pfkey_sockaddr_fill(const xfrm_address_t * xaddr,__be16 port,struct sockaddr * sa,unsigned short family)730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
731 struct sockaddr *sa,
732 unsigned short family)
733 {
734 switch (family) {
735 case AF_INET:
736 {
737 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
738 sin->sin_family = AF_INET;
739 sin->sin_port = port;
740 sin->sin_addr.s_addr = xaddr->a4;
741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
742 return 32;
743 }
744 #if IS_ENABLED(CONFIG_IPV6)
745 case AF_INET6:
746 {
747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
748 sin6->sin6_family = AF_INET6;
749 sin6->sin6_port = port;
750 sin6->sin6_flowinfo = 0;
751 sin6->sin6_addr = xaddr->in6;
752 sin6->sin6_scope_id = 0;
753 return 128;
754 }
755 #endif
756 }
757 return 0;
758 }
759
pfkey_sockaddr_fill_zero_tail(const xfrm_address_t * xaddr,__be16 port,struct sockaddr * sa,unsigned short family)760 static unsigned int pfkey_sockaddr_fill_zero_tail(const xfrm_address_t *xaddr,
761 __be16 port,
762 struct sockaddr *sa,
763 unsigned short family)
764 {
765 unsigned int prefixlen;
766 int sockaddr_len = pfkey_sockaddr_len(family);
767 int sockaddr_size = pfkey_sockaddr_size(family);
768
769 prefixlen = pfkey_sockaddr_fill(xaddr, port, sa, family);
770 if (sockaddr_size > sockaddr_len)
771 memset((u8 *)sa + sockaddr_len, 0, sockaddr_size - sockaddr_len);
772
773 return prefixlen;
774 }
775
__pfkey_xfrm_state2msg(const struct xfrm_state * x,int add_keys,int hsc)776 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
777 int add_keys, int hsc)
778 {
779 struct sk_buff *skb;
780 struct sadb_msg *hdr;
781 struct sadb_sa *sa;
782 struct sadb_lifetime *lifetime;
783 struct sadb_address *addr;
784 struct sadb_key *key;
785 struct sadb_x_sa2 *sa2;
786 struct sadb_x_sec_ctx *sec_ctx;
787 struct xfrm_sec_ctx *xfrm_ctx;
788 int ctx_size = 0;
789 int size;
790 int auth_key_size = 0;
791 int encrypt_key_size = 0;
792 int sockaddr_size;
793 struct xfrm_encap_tmpl *natt = NULL;
794 int mode;
795
796 /* address family check */
797 sockaddr_size = pfkey_sockaddr_size(x->props.family);
798 if (!sockaddr_size)
799 return ERR_PTR(-EINVAL);
800
801 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
802 key(AE), (identity(SD),) (sensitivity)> */
803 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
804 sizeof(struct sadb_lifetime) +
805 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
806 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
807 sizeof(struct sadb_address)*2 +
808 sockaddr_size*2 +
809 sizeof(struct sadb_x_sa2);
810
811 if ((xfrm_ctx = x->security)) {
812 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
813 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
814 }
815
816 /* identity & sensitivity */
817 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
818 size += sizeof(struct sadb_address) + sockaddr_size;
819
820 if (add_keys) {
821 if (x->aalg && x->aalg->alg_key_len) {
822 auth_key_size =
823 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
824 size += sizeof(struct sadb_key) + auth_key_size;
825 }
826 if (x->ealg && x->ealg->alg_key_len) {
827 encrypt_key_size =
828 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
829 size += sizeof(struct sadb_key) + encrypt_key_size;
830 }
831 }
832 if (x->encap)
833 natt = x->encap;
834
835 if (natt && natt->encap_type) {
836 size += sizeof(struct sadb_x_nat_t_type);
837 size += sizeof(struct sadb_x_nat_t_port);
838 size += sizeof(struct sadb_x_nat_t_port);
839 }
840
841 skb = alloc_skb(size + 16, GFP_ATOMIC);
842 if (skb == NULL)
843 return ERR_PTR(-ENOBUFS);
844
845 /* call should fill header later */
846 hdr = skb_put(skb, sizeof(struct sadb_msg));
847 memset(hdr, 0, size); /* XXX do we need this ? */
848 hdr->sadb_msg_len = size / sizeof(uint64_t);
849
850 /* sa */
851 sa = skb_put(skb, sizeof(struct sadb_sa));
852 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
853 sa->sadb_sa_exttype = SADB_EXT_SA;
854 sa->sadb_sa_spi = x->id.spi;
855 sa->sadb_sa_replay = x->props.replay_window;
856 switch (x->km.state) {
857 case XFRM_STATE_VALID:
858 sa->sadb_sa_state = x->km.dying ?
859 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
860 break;
861 case XFRM_STATE_ACQ:
862 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
863 break;
864 default:
865 sa->sadb_sa_state = SADB_SASTATE_DEAD;
866 break;
867 }
868 sa->sadb_sa_auth = 0;
869 if (x->aalg) {
870 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
871 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
872 a->desc.sadb_alg_id : 0;
873 }
874 sa->sadb_sa_encrypt = 0;
875 BUG_ON(x->ealg && x->calg);
876 if (x->ealg) {
877 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
878 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
879 a->desc.sadb_alg_id : 0;
880 }
881 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
882 if (x->calg) {
883 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
884 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
885 a->desc.sadb_alg_id : 0;
886 }
887
888 sa->sadb_sa_flags = 0;
889 if (x->props.flags & XFRM_STATE_NOECN)
890 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
891 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
892 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
893 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
894 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
895
896 /* hard time */
897 if (hsc & 2) {
898 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
899 lifetime->sadb_lifetime_len =
900 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
901 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
902 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
903 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
904 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
905 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
906 }
907 /* soft time */
908 if (hsc & 1) {
909 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
910 lifetime->sadb_lifetime_len =
911 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
912 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
913 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
914 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
915 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
916 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
917 }
918 /* current time */
919 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
920 lifetime->sadb_lifetime_len =
921 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
922 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
923 lifetime->sadb_lifetime_allocations = x->curlft.packets;
924 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
925 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
926 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
927 /* src address */
928 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
929 addr->sadb_address_len =
930 (sizeof(struct sadb_address)+sockaddr_size)/
931 sizeof(uint64_t);
932 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
933 /* "if the ports are non-zero, then the sadb_address_proto field,
934 normally zero, MUST be filled in with the transport
935 protocol's number." - RFC2367 */
936 addr->sadb_address_proto = 0;
937 addr->sadb_address_reserved = 0;
938
939 addr->sadb_address_prefixlen =
940 pfkey_sockaddr_fill(&x->props.saddr, 0,
941 (struct sockaddr *) (addr + 1),
942 x->props.family);
943 BUG_ON(!addr->sadb_address_prefixlen);
944
945 /* dst address */
946 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
947 addr->sadb_address_len =
948 (sizeof(struct sadb_address)+sockaddr_size)/
949 sizeof(uint64_t);
950 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
951 addr->sadb_address_proto = 0;
952 addr->sadb_address_reserved = 0;
953
954 addr->sadb_address_prefixlen =
955 pfkey_sockaddr_fill(&x->id.daddr, 0,
956 (struct sockaddr *) (addr + 1),
957 x->props.family);
958 BUG_ON(!addr->sadb_address_prefixlen);
959
960 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
961 x->props.family)) {
962 addr = skb_put(skb,
963 sizeof(struct sadb_address) + sockaddr_size);
964 addr->sadb_address_len =
965 (sizeof(struct sadb_address)+sockaddr_size)/
966 sizeof(uint64_t);
967 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
968 addr->sadb_address_proto =
969 pfkey_proto_from_xfrm(x->sel.proto);
970 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
971 addr->sadb_address_reserved = 0;
972
973 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
974 (struct sockaddr *) (addr + 1),
975 x->props.family);
976 }
977
978 /* auth key */
979 if (add_keys && auth_key_size) {
980 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
981 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
982 sizeof(uint64_t);
983 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
984 key->sadb_key_bits = x->aalg->alg_key_len;
985 key->sadb_key_reserved = 0;
986 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
987 }
988 /* encrypt key */
989 if (add_keys && encrypt_key_size) {
990 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
991 key->sadb_key_len = (sizeof(struct sadb_key) +
992 encrypt_key_size) / sizeof(uint64_t);
993 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
994 key->sadb_key_bits = x->ealg->alg_key_len;
995 key->sadb_key_reserved = 0;
996 memcpy(key + 1, x->ealg->alg_key,
997 (x->ealg->alg_key_len+7)/8);
998 }
999
1000 /* sa */
1001 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
1002 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1003 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1004 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1005 kfree_skb(skb);
1006 return ERR_PTR(-EINVAL);
1007 }
1008 sa2->sadb_x_sa2_mode = mode;
1009 sa2->sadb_x_sa2_reserved1 = 0;
1010 sa2->sadb_x_sa2_reserved2 = 0;
1011 sa2->sadb_x_sa2_sequence = 0;
1012 sa2->sadb_x_sa2_reqid = x->props.reqid;
1013
1014 if (natt && natt->encap_type) {
1015 struct sadb_x_nat_t_type *n_type;
1016 struct sadb_x_nat_t_port *n_port;
1017
1018 /* type */
1019 n_type = skb_put(skb, sizeof(*n_type));
1020 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1021 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1022 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1023 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1024 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1025 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1026
1027 /* source port */
1028 n_port = skb_put(skb, sizeof(*n_port));
1029 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1030 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1031 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1032 n_port->sadb_x_nat_t_port_reserved = 0;
1033
1034 /* dest port */
1035 n_port = skb_put(skb, sizeof(*n_port));
1036 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1037 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1038 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1039 n_port->sadb_x_nat_t_port_reserved = 0;
1040 }
1041
1042 /* security context */
1043 if (xfrm_ctx) {
1044 sec_ctx = skb_put(skb,
1045 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1046 sec_ctx->sadb_x_sec_len =
1047 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1048 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1049 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1050 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1051 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1052 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1053 xfrm_ctx->ctx_len);
1054 }
1055
1056 return skb;
1057 }
1058
1059
pfkey_xfrm_state2msg(const struct xfrm_state * x)1060 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1061 {
1062 struct sk_buff *skb;
1063
1064 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1065
1066 return skb;
1067 }
1068
pfkey_xfrm_state2msg_expire(const struct xfrm_state * x,int hsc)1069 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1070 int hsc)
1071 {
1072 return __pfkey_xfrm_state2msg(x, 0, hsc);
1073 }
1074
pfkey_msg2xfrm_state(struct net * net,const struct sadb_msg * hdr,void * const * ext_hdrs)1075 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1076 const struct sadb_msg *hdr,
1077 void * const *ext_hdrs)
1078 {
1079 struct xfrm_state *x;
1080 const struct sadb_lifetime *lifetime;
1081 const struct sadb_sa *sa;
1082 const struct sadb_key *key;
1083 const struct sadb_x_sec_ctx *sec_ctx;
1084 uint16_t proto;
1085 int err;
1086
1087
1088 sa = ext_hdrs[SADB_EXT_SA - 1];
1089 if (!sa ||
1090 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1091 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1092 return ERR_PTR(-EINVAL);
1093 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1094 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1095 return ERR_PTR(-EINVAL);
1096 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1097 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1098 return ERR_PTR(-EINVAL);
1099 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1100 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1101 return ERR_PTR(-EINVAL);
1102
1103 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1104 if (proto == 0)
1105 return ERR_PTR(-EINVAL);
1106
1107 /* default error is no buffer space */
1108 err = -ENOBUFS;
1109
1110 /* RFC2367:
1111
1112 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1113 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1114 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1115 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1116 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1117 not true.
1118
1119 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1120 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1121 */
1122 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1123 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1124 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1125 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1126 return ERR_PTR(-EINVAL);
1127 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1128 if (key != NULL &&
1129 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1130 key->sadb_key_bits == 0)
1131 return ERR_PTR(-EINVAL);
1132 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1133 if (key != NULL &&
1134 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1135 key->sadb_key_bits == 0)
1136 return ERR_PTR(-EINVAL);
1137
1138 x = xfrm_state_alloc(net);
1139 if (x == NULL)
1140 return ERR_PTR(-ENOBUFS);
1141
1142 x->id.proto = proto;
1143 x->id.spi = sa->sadb_sa_spi;
1144 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1145 (sizeof(x->replay.bitmap) * 8));
1146 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1147 x->props.flags |= XFRM_STATE_NOECN;
1148 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1149 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1150 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1151 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1152
1153 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1154 if (lifetime != NULL) {
1155 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1156 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1157 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1158 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1159 }
1160 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1161 if (lifetime != NULL) {
1162 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1163 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1164 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1165 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1166 }
1167
1168 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1169 if (sec_ctx != NULL) {
1170 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1171
1172 if (!uctx)
1173 goto out;
1174
1175 err = security_xfrm_state_alloc(x, uctx);
1176 kfree(uctx);
1177
1178 if (err)
1179 goto out;
1180 }
1181
1182 err = -ENOBUFS;
1183 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1184 if (sa->sadb_sa_auth) {
1185 int keysize = 0;
1186 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1187 if (!a || !a->pfkey_supported) {
1188 err = -ENOSYS;
1189 goto out;
1190 }
1191 if (key)
1192 keysize = (key->sadb_key_bits + 7) / 8;
1193 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1194 if (!x->aalg) {
1195 err = -ENOMEM;
1196 goto out;
1197 }
1198 strcpy(x->aalg->alg_name, a->name);
1199 x->aalg->alg_key_len = 0;
1200 if (key) {
1201 x->aalg->alg_key_len = key->sadb_key_bits;
1202 memcpy(x->aalg->alg_key, key+1, keysize);
1203 }
1204 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1205 x->props.aalgo = sa->sadb_sa_auth;
1206 /* x->algo.flags = sa->sadb_sa_flags; */
1207 }
1208 if (sa->sadb_sa_encrypt) {
1209 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1210 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1211 if (!a || !a->pfkey_supported) {
1212 err = -ENOSYS;
1213 goto out;
1214 }
1215 x->calg = kmalloc_obj(*x->calg);
1216 if (!x->calg) {
1217 err = -ENOMEM;
1218 goto out;
1219 }
1220 strcpy(x->calg->alg_name, a->name);
1221 x->props.calgo = sa->sadb_sa_encrypt;
1222 } else {
1223 int keysize = 0;
1224 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1225 if (!a || !a->pfkey_supported) {
1226 err = -ENOSYS;
1227 goto out;
1228 }
1229 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1230 if (key)
1231 keysize = (key->sadb_key_bits + 7) / 8;
1232 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1233 if (!x->ealg) {
1234 err = -ENOMEM;
1235 goto out;
1236 }
1237 strcpy(x->ealg->alg_name, a->name);
1238 x->ealg->alg_key_len = 0;
1239 if (key) {
1240 x->ealg->alg_key_len = key->sadb_key_bits;
1241 memcpy(x->ealg->alg_key, key+1, keysize);
1242 }
1243 x->props.ealgo = sa->sadb_sa_encrypt;
1244 x->geniv = a->uinfo.encr.geniv;
1245 }
1246 }
1247 /* x->algo.flags = sa->sadb_sa_flags; */
1248
1249 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1250 &x->props.saddr);
1251 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1252 &x->id.daddr);
1253
1254 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1255 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1256 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1257 if (mode < 0) {
1258 err = -EINVAL;
1259 goto out;
1260 }
1261 x->props.mode = mode;
1262 x->props.reqid = sa2->sadb_x_sa2_reqid;
1263 }
1264
1265 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1266 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1267
1268 /* Nobody uses this, but we try. */
1269 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1270 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1271 }
1272
1273 if (!x->sel.family)
1274 x->sel.family = x->props.family;
1275
1276 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1277 const struct sadb_x_nat_t_type* n_type;
1278 struct xfrm_encap_tmpl *natt;
1279
1280 x->encap = kzalloc_obj(*x->encap);
1281 if (!x->encap) {
1282 err = -ENOMEM;
1283 goto out;
1284 }
1285
1286 natt = x->encap;
1287 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1288 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1289
1290 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1291 const struct sadb_x_nat_t_port *n_port =
1292 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1293 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1294 }
1295 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1296 const struct sadb_x_nat_t_port *n_port =
1297 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1298 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1299 }
1300 }
1301
1302 err = xfrm_init_state(x);
1303 if (err)
1304 goto out;
1305
1306 x->km.seq = hdr->sadb_msg_seq;
1307 return x;
1308
1309 out:
1310 x->km.state = XFRM_STATE_DEAD;
1311 xfrm_state_put(x);
1312 return ERR_PTR(err);
1313 }
1314
pfkey_reserved(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1315 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1316 {
1317 return -EOPNOTSUPP;
1318 }
1319
pfkey_getspi(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1320 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1321 {
1322 struct net *net = sock_net(sk);
1323 struct sk_buff *resp_skb;
1324 struct sadb_x_sa2 *sa2;
1325 struct sadb_address *saddr, *daddr;
1326 struct sadb_msg *out_hdr;
1327 struct sadb_spirange *range;
1328 struct xfrm_state *x = NULL;
1329 int mode;
1330 int err;
1331 u32 min_spi, max_spi;
1332 u32 reqid;
1333 u8 proto;
1334 unsigned short family;
1335 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1336
1337 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1338 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1339 return -EINVAL;
1340
1341 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1342 if (proto == 0)
1343 return -EINVAL;
1344
1345 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1346 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1347 if (mode < 0)
1348 return -EINVAL;
1349 reqid = sa2->sadb_x_sa2_reqid;
1350 } else {
1351 mode = 0;
1352 reqid = 0;
1353 }
1354
1355 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1356 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1357
1358 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1359 switch (family) {
1360 case AF_INET:
1361 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1362 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1363 break;
1364 #if IS_ENABLED(CONFIG_IPV6)
1365 case AF_INET6:
1366 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1367 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1368 break;
1369 #endif
1370 }
1371
1372 if (hdr->sadb_msg_seq) {
1373 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
1374 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1375 xfrm_state_put(x);
1376 x = NULL;
1377 }
1378 }
1379
1380 if (!x)
1381 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, UINT_MAX,
1382 proto, xdaddr, xsaddr, 1, family);
1383
1384 if (x == NULL)
1385 return -ENOENT;
1386
1387 min_spi = 0x100;
1388 max_spi = 0x0fffffff;
1389
1390 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1391 if (range) {
1392 min_spi = range->sadb_spirange_min;
1393 max_spi = range->sadb_spirange_max;
1394 }
1395
1396 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
1397 if (err) {
1398 xfrm_state_put(x);
1399 return err;
1400 }
1401
1402 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
1403 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1404
1405 if (IS_ERR(resp_skb)) {
1406 xfrm_state_put(x);
1407 return PTR_ERR(resp_skb);
1408 }
1409
1410 out_hdr = (struct sadb_msg *) resp_skb->data;
1411 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1412 out_hdr->sadb_msg_type = SADB_GETSPI;
1413 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1414 out_hdr->sadb_msg_errno = 0;
1415 out_hdr->sadb_msg_reserved = 0;
1416 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1417 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1418
1419 xfrm_state_put(x);
1420
1421 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1422
1423 return 0;
1424 }
1425
pfkey_acquire(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1426 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1427 {
1428 struct net *net = sock_net(sk);
1429 struct xfrm_state *x;
1430
1431 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1432 return -EOPNOTSUPP;
1433
1434 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1435 return 0;
1436
1437 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
1438 if (x == NULL)
1439 return 0;
1440
1441 spin_lock_bh(&x->lock);
1442 if (x->km.state == XFRM_STATE_ACQ)
1443 x->km.state = XFRM_STATE_ERROR;
1444
1445 spin_unlock_bh(&x->lock);
1446 xfrm_state_put(x);
1447 return 0;
1448 }
1449
event2poltype(int event)1450 static inline int event2poltype(int event)
1451 {
1452 switch (event) {
1453 case XFRM_MSG_DELPOLICY:
1454 return SADB_X_SPDDELETE;
1455 case XFRM_MSG_NEWPOLICY:
1456 return SADB_X_SPDADD;
1457 case XFRM_MSG_UPDPOLICY:
1458 return SADB_X_SPDUPDATE;
1459 case XFRM_MSG_POLEXPIRE:
1460 // return SADB_X_SPDEXPIRE;
1461 default:
1462 pr_err("pfkey: Unknown policy event %d\n", event);
1463 break;
1464 }
1465
1466 return 0;
1467 }
1468
event2keytype(int event)1469 static inline int event2keytype(int event)
1470 {
1471 switch (event) {
1472 case XFRM_MSG_DELSA:
1473 return SADB_DELETE;
1474 case XFRM_MSG_NEWSA:
1475 return SADB_ADD;
1476 case XFRM_MSG_UPDSA:
1477 return SADB_UPDATE;
1478 case XFRM_MSG_EXPIRE:
1479 return SADB_EXPIRE;
1480 default:
1481 pr_err("pfkey: Unknown SA event %d\n", event);
1482 break;
1483 }
1484
1485 return 0;
1486 }
1487
1488 /* ADD/UPD/DEL */
key_notify_sa(struct xfrm_state * x,const struct km_event * c)1489 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1490 {
1491 struct sk_buff *skb;
1492 struct sadb_msg *hdr;
1493
1494 skb = pfkey_xfrm_state2msg(x);
1495
1496 if (IS_ERR(skb))
1497 return PTR_ERR(skb);
1498
1499 hdr = (struct sadb_msg *) skb->data;
1500 hdr->sadb_msg_version = PF_KEY_V2;
1501 hdr->sadb_msg_type = event2keytype(c->event);
1502 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1503 hdr->sadb_msg_errno = 0;
1504 hdr->sadb_msg_reserved = 0;
1505 hdr->sadb_msg_seq = c->seq;
1506 hdr->sadb_msg_pid = c->portid;
1507
1508 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1509
1510 return 0;
1511 }
1512
pfkey_add(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1513 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1514 {
1515 struct net *net = sock_net(sk);
1516 struct xfrm_state *x;
1517 int err;
1518 struct km_event c;
1519
1520 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1521 if (IS_ERR(x))
1522 return PTR_ERR(x);
1523
1524 xfrm_state_hold(x);
1525 if (hdr->sadb_msg_type == SADB_ADD)
1526 err = xfrm_state_add(x);
1527 else
1528 err = xfrm_state_update(x);
1529
1530 xfrm_audit_state_add(x, err ? 0 : 1, true);
1531
1532 if (err < 0) {
1533 x->km.state = XFRM_STATE_DEAD;
1534 __xfrm_state_put(x);
1535 goto out;
1536 }
1537
1538 if (hdr->sadb_msg_type == SADB_ADD)
1539 c.event = XFRM_MSG_NEWSA;
1540 else
1541 c.event = XFRM_MSG_UPDSA;
1542 c.seq = hdr->sadb_msg_seq;
1543 c.portid = hdr->sadb_msg_pid;
1544 km_state_notify(x, &c);
1545 out:
1546 xfrm_state_put(x);
1547 return err;
1548 }
1549
pfkey_delete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1550 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1551 {
1552 struct net *net = sock_net(sk);
1553 struct xfrm_state *x;
1554 struct km_event c;
1555 int err;
1556
1557 if (!ext_hdrs[SADB_EXT_SA-1] ||
1558 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1559 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1560 return -EINVAL;
1561
1562 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1563 if (x == NULL)
1564 return -ESRCH;
1565
1566 if ((err = security_xfrm_state_delete(x)))
1567 goto out;
1568
1569 if (xfrm_state_kern(x)) {
1570 err = -EPERM;
1571 goto out;
1572 }
1573
1574 err = xfrm_state_delete(x);
1575
1576 if (err < 0)
1577 goto out;
1578
1579 c.seq = hdr->sadb_msg_seq;
1580 c.portid = hdr->sadb_msg_pid;
1581 c.event = XFRM_MSG_DELSA;
1582 km_state_notify(x, &c);
1583 out:
1584 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1585 xfrm_state_put(x);
1586
1587 return err;
1588 }
1589
pfkey_get(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1590 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1591 {
1592 struct net *net = sock_net(sk);
1593 __u8 proto;
1594 struct sk_buff *out_skb;
1595 struct sadb_msg *out_hdr;
1596 struct xfrm_state *x;
1597
1598 if (!ext_hdrs[SADB_EXT_SA-1] ||
1599 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1600 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1601 return -EINVAL;
1602
1603 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1604 if (x == NULL)
1605 return -ESRCH;
1606
1607 out_skb = pfkey_xfrm_state2msg(x);
1608 proto = x->id.proto;
1609 xfrm_state_put(x);
1610 if (IS_ERR(out_skb))
1611 return PTR_ERR(out_skb);
1612
1613 out_hdr = (struct sadb_msg *) out_skb->data;
1614 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1615 out_hdr->sadb_msg_type = SADB_GET;
1616 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1617 out_hdr->sadb_msg_errno = 0;
1618 out_hdr->sadb_msg_reserved = 0;
1619 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1620 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1621 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1622
1623 return 0;
1624 }
1625
compose_sadb_supported(const struct sadb_msg * orig,gfp_t allocation)1626 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1627 gfp_t allocation)
1628 {
1629 struct sk_buff *skb;
1630 struct sadb_msg *hdr;
1631 int len, auth_len, enc_len, i;
1632
1633 auth_len = xfrm_count_pfkey_auth_supported();
1634 if (auth_len) {
1635 auth_len *= sizeof(struct sadb_alg);
1636 auth_len += sizeof(struct sadb_supported);
1637 }
1638
1639 enc_len = xfrm_count_pfkey_enc_supported();
1640 if (enc_len) {
1641 enc_len *= sizeof(struct sadb_alg);
1642 enc_len += sizeof(struct sadb_supported);
1643 }
1644
1645 len = enc_len + auth_len + sizeof(struct sadb_msg);
1646
1647 skb = alloc_skb(len + 16, allocation);
1648 if (!skb)
1649 goto out_put_algs;
1650
1651 hdr = skb_put(skb, sizeof(*hdr));
1652 pfkey_hdr_dup(hdr, orig);
1653 hdr->sadb_msg_errno = 0;
1654 hdr->sadb_msg_len = len / sizeof(uint64_t);
1655
1656 if (auth_len) {
1657 struct sadb_supported *sp;
1658 struct sadb_alg *ap;
1659
1660 sp = skb_put(skb, auth_len);
1661 ap = (struct sadb_alg *) (sp + 1);
1662
1663 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1664 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1665
1666 for (i = 0; ; i++) {
1667 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1668 if (!aalg)
1669 break;
1670 if (!aalg->pfkey_supported)
1671 continue;
1672 if (aalg->available)
1673 *ap++ = aalg->desc;
1674 }
1675 }
1676
1677 if (enc_len) {
1678 struct sadb_supported *sp;
1679 struct sadb_alg *ap;
1680
1681 sp = skb_put(skb, enc_len);
1682 ap = (struct sadb_alg *) (sp + 1);
1683
1684 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1685 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1686
1687 for (i = 0; ; i++) {
1688 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1689 if (!ealg)
1690 break;
1691 if (!ealg->pfkey_supported)
1692 continue;
1693 if (ealg->available)
1694 *ap++ = ealg->desc;
1695 }
1696 }
1697
1698 out_put_algs:
1699 return skb;
1700 }
1701
pfkey_register(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1702 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1703 {
1704 struct pfkey_sock *pfk = pfkey_sk(sk);
1705 struct sk_buff *supp_skb;
1706
1707 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1708 return -EINVAL;
1709
1710 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1711 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1712 return -EEXIST;
1713 pfk->registered |= (1<<hdr->sadb_msg_satype);
1714 }
1715
1716 mutex_lock(&pfkey_mutex);
1717 xfrm_probe_algs();
1718
1719 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1720 mutex_unlock(&pfkey_mutex);
1721
1722 if (!supp_skb) {
1723 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1724 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1725
1726 return -ENOBUFS;
1727 }
1728
1729 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1730 sock_net(sk));
1731 return 0;
1732 }
1733
unicast_flush_resp(struct sock * sk,const struct sadb_msg * ihdr)1734 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1735 {
1736 struct sk_buff *skb;
1737 struct sadb_msg *hdr;
1738
1739 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1740 if (!skb)
1741 return -ENOBUFS;
1742
1743 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1744 hdr->sadb_msg_errno = (uint8_t) 0;
1745 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1746
1747 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1748 sock_net(sk));
1749 }
1750
key_notify_sa_flush(const struct km_event * c)1751 static int key_notify_sa_flush(const struct km_event *c)
1752 {
1753 struct sk_buff *skb;
1754 struct sadb_msg *hdr;
1755
1756 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1757 if (!skb)
1758 return -ENOBUFS;
1759 hdr = skb_put(skb, sizeof(struct sadb_msg));
1760 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1761 hdr->sadb_msg_type = SADB_FLUSH;
1762 hdr->sadb_msg_seq = c->seq;
1763 hdr->sadb_msg_pid = c->portid;
1764 hdr->sadb_msg_version = PF_KEY_V2;
1765 hdr->sadb_msg_errno = (uint8_t) 0;
1766 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1767 hdr->sadb_msg_reserved = 0;
1768
1769 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1770
1771 return 0;
1772 }
1773
pfkey_flush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1774 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1775 {
1776 struct net *net = sock_net(sk);
1777 unsigned int proto;
1778 struct km_event c;
1779 int err, err2;
1780
1781 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1782 if (proto == 0)
1783 return -EINVAL;
1784
1785 err = xfrm_state_flush(net, proto, true);
1786 err2 = unicast_flush_resp(sk, hdr);
1787 if (err || err2) {
1788 if (err == -ESRCH) /* empty table - go quietly */
1789 err = 0;
1790 return err ? err : err2;
1791 }
1792
1793 c.data.proto = proto;
1794 c.seq = hdr->sadb_msg_seq;
1795 c.portid = hdr->sadb_msg_pid;
1796 c.event = XFRM_MSG_FLUSHSA;
1797 c.net = net;
1798 km_state_notify(NULL, &c);
1799
1800 return 0;
1801 }
1802
dump_sa(struct xfrm_state * x,int count,void * ptr)1803 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1804 {
1805 struct pfkey_sock *pfk = ptr;
1806 struct sk_buff *out_skb;
1807 struct sadb_msg *out_hdr;
1808
1809 if (!pfkey_can_dump(&pfk->sk))
1810 return -ENOBUFS;
1811
1812 out_skb = pfkey_xfrm_state2msg(x);
1813 if (IS_ERR(out_skb))
1814 return PTR_ERR(out_skb);
1815
1816 out_hdr = (struct sadb_msg *) out_skb->data;
1817 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1818 out_hdr->sadb_msg_type = SADB_DUMP;
1819 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1820 out_hdr->sadb_msg_errno = 0;
1821 out_hdr->sadb_msg_reserved = 0;
1822 out_hdr->sadb_msg_seq = count + 1;
1823 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1824
1825 if (pfk->dump.skb)
1826 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1827 &pfk->sk, sock_net(&pfk->sk));
1828 pfk->dump.skb = out_skb;
1829
1830 return 0;
1831 }
1832
pfkey_dump_sa(struct pfkey_sock * pfk)1833 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1834 {
1835 struct net *net = sock_net(&pfk->sk);
1836 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1837 }
1838
pfkey_dump_sa_done(struct pfkey_sock * pfk)1839 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1840 {
1841 struct net *net = sock_net(&pfk->sk);
1842
1843 xfrm_state_walk_done(&pfk->dump.u.state, net);
1844 }
1845
pfkey_dump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1846 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1847 {
1848 u8 proto;
1849 struct xfrm_address_filter *filter = NULL;
1850 struct pfkey_sock *pfk = pfkey_sk(sk);
1851
1852 mutex_lock(&pfk->dump_lock);
1853 if (pfk->dump.dump != NULL) {
1854 mutex_unlock(&pfk->dump_lock);
1855 return -EBUSY;
1856 }
1857
1858 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1859 if (proto == 0) {
1860 mutex_unlock(&pfk->dump_lock);
1861 return -EINVAL;
1862 }
1863
1864 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1865 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1866
1867 if ((xfilter->sadb_x_filter_splen >
1868 (sizeof(xfrm_address_t) << 3)) ||
1869 (xfilter->sadb_x_filter_dplen >
1870 (sizeof(xfrm_address_t) << 3))) {
1871 mutex_unlock(&pfk->dump_lock);
1872 return -EINVAL;
1873 }
1874 filter = kmalloc_obj(*filter);
1875 if (filter == NULL) {
1876 mutex_unlock(&pfk->dump_lock);
1877 return -ENOMEM;
1878 }
1879
1880 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1881 sizeof(xfrm_address_t));
1882 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1883 sizeof(xfrm_address_t));
1884 filter->family = xfilter->sadb_x_filter_family;
1885 filter->splen = xfilter->sadb_x_filter_splen;
1886 filter->dplen = xfilter->sadb_x_filter_dplen;
1887 }
1888
1889 pfk->dump.msg_version = hdr->sadb_msg_version;
1890 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1891 pfk->dump.dump = pfkey_dump_sa;
1892 pfk->dump.done = pfkey_dump_sa_done;
1893 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1894 mutex_unlock(&pfk->dump_lock);
1895
1896 return pfkey_do_dump(pfk);
1897 }
1898
pfkey_promisc(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)1899 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1900 {
1901 struct pfkey_sock *pfk = pfkey_sk(sk);
1902 int satype = hdr->sadb_msg_satype;
1903 bool reset_errno = false;
1904
1905 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1906 reset_errno = true;
1907 if (satype != 0 && satype != 1)
1908 return -EINVAL;
1909 pfk->promisc = satype;
1910 }
1911 if (reset_errno && skb_cloned(skb))
1912 skb = skb_copy(skb, GFP_KERNEL);
1913 else
1914 skb = skb_clone(skb, GFP_KERNEL);
1915
1916 if (reset_errno && skb) {
1917 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1918 new_hdr->sadb_msg_errno = 0;
1919 }
1920
1921 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1922 return 0;
1923 }
1924
check_reqid(struct xfrm_policy * xp,int dir,int count,void * ptr)1925 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1926 {
1927 int i;
1928 u32 reqid = *(u32*)ptr;
1929
1930 for (i=0; i<xp->xfrm_nr; i++) {
1931 if (xp->xfrm_vec[i].reqid == reqid)
1932 return -EEXIST;
1933 }
1934 return 0;
1935 }
1936
gen_reqid(struct net * net)1937 static u32 gen_reqid(struct net *net)
1938 {
1939 struct xfrm_policy_walk walk;
1940 u32 start;
1941 int rc;
1942 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1943
1944 start = reqid;
1945 do {
1946 ++reqid;
1947 if (reqid == 0)
1948 reqid = IPSEC_MANUAL_REQID_MAX+1;
1949 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1950 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1951 xfrm_policy_walk_done(&walk, net);
1952 if (rc != -EEXIST)
1953 return reqid;
1954 } while (reqid != start);
1955 return 0;
1956 }
1957
1958 static int
parse_ipsecrequest(struct xfrm_policy * xp,struct sadb_x_policy * pol,struct sadb_x_ipsecrequest * rq)1959 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol,
1960 struct sadb_x_ipsecrequest *rq)
1961 {
1962 struct net *net = xp_net(xp);
1963 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1964 int mode;
1965
1966 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1967 return -ELOOP;
1968
1969 if (rq->sadb_x_ipsecrequest_mode == 0)
1970 return -EINVAL;
1971 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1972 return -EINVAL;
1973
1974 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1975 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1976 return -EINVAL;
1977 t->mode = mode;
1978 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) {
1979 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) &&
1980 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND)
1981 return -EINVAL;
1982 t->optional = 1;
1983 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1984 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1985 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1986 t->reqid = 0;
1987 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1988 return -ENOBUFS;
1989 }
1990
1991 /* addresses present only in tunnel mode */
1992 if (t->mode == XFRM_MODE_TUNNEL) {
1993 int err;
1994
1995 err = parse_sockaddr_pair(
1996 (struct sockaddr *)(rq + 1),
1997 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1998 &t->saddr, &t->id.daddr, &t->encap_family);
1999 if (err)
2000 return err;
2001 } else
2002 t->encap_family = xp->family;
2003
2004 /* No way to set this via kame pfkey */
2005 t->allalgs = 1;
2006 xp->xfrm_nr++;
2007 return 0;
2008 }
2009
2010 static int
parse_ipsecrequests(struct xfrm_policy * xp,struct sadb_x_policy * pol)2011 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2012 {
2013 int err;
2014 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2015 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2016
2017 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2018 return -EINVAL;
2019
2020 while (len >= sizeof(*rq)) {
2021 if (len < rq->sadb_x_ipsecrequest_len ||
2022 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2023 return -EINVAL;
2024
2025 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0)
2026 return err;
2027 len -= rq->sadb_x_ipsecrequest_len;
2028 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2029 }
2030 return 0;
2031 }
2032
pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy * xp)2033 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2034 {
2035 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2036
2037 if (xfrm_ctx) {
2038 int len = sizeof(struct sadb_x_sec_ctx);
2039 len += xfrm_ctx->ctx_len;
2040 return PFKEY_ALIGN8(len);
2041 }
2042 return 0;
2043 }
2044
pfkey_xfrm_policy2msg_size(const struct xfrm_policy * xp)2045 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2046 {
2047 const struct xfrm_tmpl *t;
2048 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2049 int socklen = 0;
2050 int i;
2051
2052 for (i=0; i<xp->xfrm_nr; i++) {
2053 t = xp->xfrm_vec + i;
2054 socklen += pfkey_sockaddr_len(t->encap_family);
2055 }
2056
2057 return sizeof(struct sadb_msg) +
2058 (sizeof(struct sadb_lifetime) * 3) +
2059 (sizeof(struct sadb_address) * 2) +
2060 (sockaddr_size * 2) +
2061 sizeof(struct sadb_x_policy) +
2062 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2063 (socklen * 2) +
2064 pfkey_xfrm_policy2sec_ctx_size(xp);
2065 }
2066
pfkey_xfrm_policy2msg_prep(const struct xfrm_policy * xp)2067 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2068 {
2069 struct sk_buff *skb;
2070 int size;
2071
2072 size = pfkey_xfrm_policy2msg_size(xp);
2073
2074 skb = alloc_skb(size + 16, GFP_ATOMIC);
2075 if (skb == NULL)
2076 return ERR_PTR(-ENOBUFS);
2077
2078 return skb;
2079 }
2080
pfkey_xfrm_policy2msg(struct sk_buff * skb,const struct xfrm_policy * xp,int dir)2081 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2082 {
2083 struct sadb_msg *hdr;
2084 struct sadb_address *addr;
2085 struct sadb_lifetime *lifetime;
2086 struct sadb_x_policy *pol;
2087 struct sadb_x_sec_ctx *sec_ctx;
2088 struct xfrm_sec_ctx *xfrm_ctx;
2089 int i;
2090 int size;
2091 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2092 int socklen = pfkey_sockaddr_len(xp->family);
2093
2094 size = pfkey_xfrm_policy2msg_size(xp);
2095
2096 /* call should fill header later */
2097 hdr = skb_put(skb, sizeof(struct sadb_msg));
2098 memset(hdr, 0, size); /* XXX do we need this ? */
2099
2100 /* src address */
2101 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2102 addr->sadb_address_len =
2103 (sizeof(struct sadb_address)+sockaddr_size)/
2104 sizeof(uint64_t);
2105 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2106 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2107 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2108 addr->sadb_address_reserved = 0;
2109 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2110 xp->selector.sport,
2111 (struct sockaddr *) (addr + 1),
2112 xp->family))
2113 BUG();
2114
2115 /* dst address */
2116 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2117 addr->sadb_address_len =
2118 (sizeof(struct sadb_address)+sockaddr_size)/
2119 sizeof(uint64_t);
2120 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2121 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2122 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2123 addr->sadb_address_reserved = 0;
2124
2125 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2126 (struct sockaddr *) (addr + 1),
2127 xp->family);
2128
2129 /* hard time */
2130 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2131 lifetime->sadb_lifetime_len =
2132 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2133 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2134 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2135 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2136 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2137 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2138 /* soft time */
2139 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2140 lifetime->sadb_lifetime_len =
2141 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2142 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2143 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2144 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2145 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2146 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2147 /* current time */
2148 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2149 lifetime->sadb_lifetime_len =
2150 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2151 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2152 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2153 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2154 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2155 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2156
2157 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2158 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2159 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2160 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2161 if (xp->action == XFRM_POLICY_ALLOW) {
2162 if (xp->xfrm_nr)
2163 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2164 else
2165 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2166 }
2167 pol->sadb_x_policy_dir = dir+1;
2168 pol->sadb_x_policy_reserved = 0;
2169 pol->sadb_x_policy_id = xp->index;
2170 pol->sadb_x_policy_priority = xp->priority;
2171
2172 for (i=0; i<xp->xfrm_nr; i++) {
2173 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2174 struct sadb_x_ipsecrequest *rq;
2175 int req_size;
2176 int mode;
2177
2178 req_size = sizeof(struct sadb_x_ipsecrequest);
2179 if (t->mode == XFRM_MODE_TUNNEL) {
2180 socklen = pfkey_sockaddr_len(t->encap_family);
2181 req_size += socklen * 2;
2182 } else {
2183 size -= 2*socklen;
2184 }
2185 rq = skb_put(skb, req_size);
2186 pol->sadb_x_policy_len += req_size/8;
2187 memset(rq, 0, sizeof(*rq));
2188 rq->sadb_x_ipsecrequest_len = req_size;
2189 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2190 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2191 return -EINVAL;
2192 rq->sadb_x_ipsecrequest_mode = mode;
2193 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2194 if (t->reqid)
2195 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2196 if (t->optional)
2197 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2198 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2199
2200 if (t->mode == XFRM_MODE_TUNNEL) {
2201 u8 *sa = (void *)(rq + 1);
2202 pfkey_sockaddr_fill(&t->saddr, 0,
2203 (struct sockaddr *)sa,
2204 t->encap_family);
2205 pfkey_sockaddr_fill(&t->id.daddr, 0,
2206 (struct sockaddr *) (sa + socklen),
2207 t->encap_family);
2208 }
2209 }
2210
2211 /* security context */
2212 if ((xfrm_ctx = xp->security)) {
2213 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2214
2215 sec_ctx = skb_put(skb, ctx_size);
2216 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2217 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2218 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2219 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2220 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2221 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2222 xfrm_ctx->ctx_len);
2223 }
2224
2225 hdr->sadb_msg_len = size / sizeof(uint64_t);
2226 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2227
2228 return 0;
2229 }
2230
key_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)2231 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2232 {
2233 struct sk_buff *out_skb;
2234 struct sadb_msg *out_hdr;
2235 int err;
2236
2237 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2238 if (IS_ERR(out_skb))
2239 return PTR_ERR(out_skb);
2240
2241 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2242 if (err < 0) {
2243 kfree_skb(out_skb);
2244 return err;
2245 }
2246
2247 out_hdr = (struct sadb_msg *) out_skb->data;
2248 out_hdr->sadb_msg_version = PF_KEY_V2;
2249
2250 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2251 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2252 else
2253 out_hdr->sadb_msg_type = event2poltype(c->event);
2254 out_hdr->sadb_msg_errno = 0;
2255 out_hdr->sadb_msg_seq = c->seq;
2256 out_hdr->sadb_msg_pid = c->portid;
2257 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2258 return 0;
2259
2260 }
2261
pfkey_spdadd(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2262 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2263 {
2264 struct net *net = sock_net(sk);
2265 int err = 0;
2266 struct sadb_lifetime *lifetime;
2267 struct sadb_address *sa;
2268 struct sadb_x_policy *pol;
2269 struct xfrm_policy *xp;
2270 struct km_event c;
2271 struct sadb_x_sec_ctx *sec_ctx;
2272
2273 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2274 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2275 !ext_hdrs[SADB_X_EXT_POLICY-1])
2276 return -EINVAL;
2277
2278 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2279 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2280 return -EINVAL;
2281 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2282 return -EINVAL;
2283
2284 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2285 if (xp == NULL)
2286 return -ENOBUFS;
2287
2288 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2289 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2290 xp->priority = pol->sadb_x_policy_priority;
2291
2292 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2293 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2294 xp->selector.family = xp->family;
2295 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2296 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2297 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2298 if (xp->selector.sport)
2299 xp->selector.sport_mask = htons(0xffff);
2300
2301 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2302 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2303 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2304
2305 /* Amusing, we set this twice. KAME apps appear to set same value
2306 * in both addresses.
2307 */
2308 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2309
2310 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2311 if (xp->selector.dport)
2312 xp->selector.dport_mask = htons(0xffff);
2313
2314 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2315 if (sec_ctx != NULL) {
2316 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2317
2318 if (!uctx) {
2319 err = -ENOBUFS;
2320 goto out;
2321 }
2322
2323 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2324 kfree(uctx);
2325
2326 if (err)
2327 goto out;
2328 }
2329
2330 xp->lft.soft_byte_limit = XFRM_INF;
2331 xp->lft.hard_byte_limit = XFRM_INF;
2332 xp->lft.soft_packet_limit = XFRM_INF;
2333 xp->lft.hard_packet_limit = XFRM_INF;
2334 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2335 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2336 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2337 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2338 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2339 }
2340 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2341 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2342 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2343 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2344 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2345 }
2346 xp->xfrm_nr = 0;
2347 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2348 (err = parse_ipsecrequests(xp, pol)) < 0)
2349 goto out;
2350
2351 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2352 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2353
2354 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2355
2356 if (err)
2357 goto out;
2358
2359 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2360 c.event = XFRM_MSG_UPDPOLICY;
2361 else
2362 c.event = XFRM_MSG_NEWPOLICY;
2363
2364 c.seq = hdr->sadb_msg_seq;
2365 c.portid = hdr->sadb_msg_pid;
2366
2367 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2368 xfrm_pol_put(xp);
2369 return 0;
2370
2371 out:
2372 xp->walk.dead = 1;
2373 xfrm_policy_destroy(xp);
2374 return err;
2375 }
2376
pfkey_spddelete(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2377 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2378 {
2379 struct net *net = sock_net(sk);
2380 int err;
2381 struct sadb_address *sa;
2382 struct sadb_x_policy *pol;
2383 struct xfrm_policy *xp;
2384 struct xfrm_selector sel;
2385 struct km_event c;
2386 struct sadb_x_sec_ctx *sec_ctx;
2387 struct xfrm_sec_ctx *pol_ctx = NULL;
2388
2389 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2390 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2391 !ext_hdrs[SADB_X_EXT_POLICY-1])
2392 return -EINVAL;
2393
2394 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2395 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2396 return -EINVAL;
2397
2398 memset(&sel, 0, sizeof(sel));
2399
2400 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2401 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2402 sel.prefixlen_s = sa->sadb_address_prefixlen;
2403 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2404 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2405 if (sel.sport)
2406 sel.sport_mask = htons(0xffff);
2407
2408 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2409 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2410 sel.prefixlen_d = sa->sadb_address_prefixlen;
2411 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2412 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2413 if (sel.dport)
2414 sel.dport_mask = htons(0xffff);
2415
2416 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2417 if (sec_ctx != NULL) {
2418 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2419
2420 if (!uctx)
2421 return -ENOMEM;
2422
2423 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2424 kfree(uctx);
2425 if (err)
2426 return err;
2427 }
2428
2429 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2430 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2431 1, &err);
2432 security_xfrm_policy_free(pol_ctx);
2433 if (xp == NULL)
2434 return -ENOENT;
2435
2436 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2437
2438 if (err)
2439 goto out;
2440
2441 c.seq = hdr->sadb_msg_seq;
2442 c.portid = hdr->sadb_msg_pid;
2443 c.data.byid = 0;
2444 c.event = XFRM_MSG_DELPOLICY;
2445 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2446
2447 out:
2448 xfrm_pol_put(xp);
2449 return err;
2450 }
2451
key_pol_get_resp(struct sock * sk,struct xfrm_policy * xp,const struct sadb_msg * hdr,int dir)2452 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2453 {
2454 int err;
2455 struct sk_buff *out_skb;
2456 struct sadb_msg *out_hdr;
2457 err = 0;
2458
2459 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2460 if (IS_ERR(out_skb)) {
2461 err = PTR_ERR(out_skb);
2462 goto out;
2463 }
2464 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2465 if (err < 0) {
2466 kfree_skb(out_skb);
2467 goto out;
2468 }
2469
2470 out_hdr = (struct sadb_msg *) out_skb->data;
2471 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2472 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2473 out_hdr->sadb_msg_satype = 0;
2474 out_hdr->sadb_msg_errno = 0;
2475 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2476 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2477 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2478 err = 0;
2479
2480 out:
2481 return err;
2482 }
2483
pfkey_sockaddr_pair_size(sa_family_t family)2484 static int pfkey_sockaddr_pair_size(sa_family_t family)
2485 {
2486 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2487 }
2488
parse_sockaddr_pair(struct sockaddr * sa,int ext_len,xfrm_address_t * saddr,xfrm_address_t * daddr,u16 * family)2489 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2490 xfrm_address_t *saddr, xfrm_address_t *daddr,
2491 u16 *family)
2492 {
2493 int af, socklen;
2494
2495 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2496 return -EINVAL;
2497
2498 af = pfkey_sockaddr_extract(sa, saddr);
2499 if (!af)
2500 return -EINVAL;
2501
2502 socklen = pfkey_sockaddr_len(af);
2503 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2504 daddr) != af)
2505 return -EINVAL;
2506
2507 *family = af;
2508 return 0;
2509 }
2510
2511 #ifdef CONFIG_NET_KEY_MIGRATE
ipsecrequests_to_migrate(struct sadb_x_ipsecrequest * rq1,int len,struct xfrm_migrate * m)2512 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2513 struct xfrm_migrate *m)
2514 {
2515 int err;
2516 struct sadb_x_ipsecrequest *rq2;
2517 int mode;
2518
2519 if (len < sizeof(*rq1) ||
2520 len < rq1->sadb_x_ipsecrequest_len ||
2521 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2522 return -EINVAL;
2523
2524 /* old endoints */
2525 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2526 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2527 &m->old_saddr, &m->old_daddr,
2528 &m->old_family);
2529 if (err)
2530 return err;
2531
2532 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2533 len -= rq1->sadb_x_ipsecrequest_len;
2534
2535 if (len <= sizeof(*rq2) ||
2536 len < rq2->sadb_x_ipsecrequest_len ||
2537 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2538 return -EINVAL;
2539
2540 /* new endpoints */
2541 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2542 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2543 &m->new_saddr, &m->new_daddr,
2544 &m->new_family);
2545 if (err)
2546 return err;
2547
2548 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2549 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2550 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2551 return -EINVAL;
2552
2553 m->proto = rq1->sadb_x_ipsecrequest_proto;
2554 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2555 return -EINVAL;
2556 m->mode = mode;
2557 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2558
2559 return ((int)(rq1->sadb_x_ipsecrequest_len +
2560 rq2->sadb_x_ipsecrequest_len));
2561 }
2562
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2563 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2564 const struct sadb_msg *hdr, void * const *ext_hdrs)
2565 {
2566 int i, len, ret, err = -EINVAL;
2567 u8 dir;
2568 struct sadb_address *sa;
2569 struct sadb_x_kmaddress *kma;
2570 struct sadb_x_policy *pol;
2571 struct sadb_x_ipsecrequest *rq;
2572 struct xfrm_selector sel;
2573 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2574 struct xfrm_kmaddress k;
2575 struct net *net = sock_net(sk);
2576
2577 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2578 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2579 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2580 err = -EINVAL;
2581 goto out;
2582 }
2583
2584 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2585 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2586
2587 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2588 err = -EINVAL;
2589 goto out;
2590 }
2591
2592 if (kma) {
2593 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2594 k.reserved = kma->sadb_x_kmaddress_reserved;
2595 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2596 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2597 &k.local, &k.remote, &k.family);
2598 if (ret < 0) {
2599 err = ret;
2600 goto out;
2601 }
2602 }
2603
2604 dir = pol->sadb_x_policy_dir - 1;
2605 memset(&sel, 0, sizeof(sel));
2606
2607 /* set source address info of selector */
2608 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2609 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2610 sel.prefixlen_s = sa->sadb_address_prefixlen;
2611 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2612 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2613 if (sel.sport)
2614 sel.sport_mask = htons(0xffff);
2615
2616 /* set destination address info of selector */
2617 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2618 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2619 sel.prefixlen_d = sa->sadb_address_prefixlen;
2620 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2621 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2622 if (sel.dport)
2623 sel.dport_mask = htons(0xffff);
2624
2625 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2626
2627 /* extract ipsecrequests */
2628 i = 0;
2629 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2630
2631 while (len > 0 && i < XFRM_MAX_DEPTH) {
2632 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2633 if (ret < 0) {
2634 err = ret;
2635 goto out;
2636 } else {
2637 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2638 len -= ret;
2639 i++;
2640 }
2641 }
2642
2643 if (!i || len > 0) {
2644 err = -EINVAL;
2645 goto out;
2646 }
2647
2648 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2649 kma ? &k : NULL, net, NULL, 0, NULL, NULL);
2650
2651 out:
2652 return err;
2653 }
2654 #else
pfkey_migrate(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2655 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2656 const struct sadb_msg *hdr, void * const *ext_hdrs)
2657 {
2658 return -ENOPROTOOPT;
2659 }
2660 #endif
2661
2662
pfkey_spdget(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2663 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2664 {
2665 struct net *net = sock_net(sk);
2666 unsigned int dir;
2667 int err = 0, delete;
2668 struct sadb_x_policy *pol;
2669 struct xfrm_policy *xp;
2670 struct km_event c;
2671
2672 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2673 return -EINVAL;
2674
2675 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2676 if (dir >= XFRM_POLICY_MAX)
2677 return -EINVAL;
2678
2679 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2680 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2681 dir, pol->sadb_x_policy_id, delete, &err);
2682 if (xp == NULL)
2683 return -ENOENT;
2684
2685 if (delete) {
2686 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2687
2688 if (err)
2689 goto out;
2690 c.seq = hdr->sadb_msg_seq;
2691 c.portid = hdr->sadb_msg_pid;
2692 c.data.byid = 1;
2693 c.event = XFRM_MSG_DELPOLICY;
2694 km_policy_notify(xp, dir, &c);
2695 } else {
2696 err = key_pol_get_resp(sk, xp, hdr, dir);
2697 }
2698
2699 out:
2700 xfrm_pol_put(xp);
2701 return err;
2702 }
2703
dump_sp(struct xfrm_policy * xp,int dir,int count,void * ptr)2704 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2705 {
2706 struct pfkey_sock *pfk = ptr;
2707 struct sk_buff *out_skb;
2708 struct sadb_msg *out_hdr;
2709 int err;
2710
2711 if (!pfkey_can_dump(&pfk->sk))
2712 return -ENOBUFS;
2713
2714 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2715 if (IS_ERR(out_skb))
2716 return PTR_ERR(out_skb);
2717
2718 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2719 if (err < 0) {
2720 kfree_skb(out_skb);
2721 return err;
2722 }
2723
2724 out_hdr = (struct sadb_msg *) out_skb->data;
2725 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2726 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2727 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2728 out_hdr->sadb_msg_errno = 0;
2729 out_hdr->sadb_msg_seq = count + 1;
2730 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2731
2732 if (pfk->dump.skb)
2733 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2734 &pfk->sk, sock_net(&pfk->sk));
2735 pfk->dump.skb = out_skb;
2736
2737 return 0;
2738 }
2739
pfkey_dump_sp(struct pfkey_sock * pfk)2740 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2741 {
2742 struct net *net = sock_net(&pfk->sk);
2743 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2744 }
2745
pfkey_dump_sp_done(struct pfkey_sock * pfk)2746 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2747 {
2748 struct net *net = sock_net((struct sock *)pfk);
2749
2750 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2751 }
2752
pfkey_spddump(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2753 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2754 {
2755 struct pfkey_sock *pfk = pfkey_sk(sk);
2756
2757 mutex_lock(&pfk->dump_lock);
2758 if (pfk->dump.dump != NULL) {
2759 mutex_unlock(&pfk->dump_lock);
2760 return -EBUSY;
2761 }
2762
2763 pfk->dump.msg_version = hdr->sadb_msg_version;
2764 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2765 pfk->dump.dump = pfkey_dump_sp;
2766 pfk->dump.done = pfkey_dump_sp_done;
2767 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2768 mutex_unlock(&pfk->dump_lock);
2769
2770 return pfkey_do_dump(pfk);
2771 }
2772
key_notify_policy_flush(const struct km_event * c)2773 static int key_notify_policy_flush(const struct km_event *c)
2774 {
2775 struct sk_buff *skb_out;
2776 struct sadb_msg *hdr;
2777
2778 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2779 if (!skb_out)
2780 return -ENOBUFS;
2781 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2782 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2783 hdr->sadb_msg_seq = c->seq;
2784 hdr->sadb_msg_pid = c->portid;
2785 hdr->sadb_msg_version = PF_KEY_V2;
2786 hdr->sadb_msg_errno = (uint8_t) 0;
2787 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2788 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2789 hdr->sadb_msg_reserved = 0;
2790 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2791 return 0;
2792
2793 }
2794
pfkey_spdflush(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr,void * const * ext_hdrs)2795 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2796 {
2797 struct net *net = sock_net(sk);
2798 struct km_event c;
2799 int err, err2;
2800
2801 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2802 err2 = unicast_flush_resp(sk, hdr);
2803 if (err || err2) {
2804 if (err == -ESRCH) /* empty table - old silent behavior */
2805 return 0;
2806 return err;
2807 }
2808
2809 c.data.type = XFRM_POLICY_TYPE_MAIN;
2810 c.event = XFRM_MSG_FLUSHPOLICY;
2811 c.portid = hdr->sadb_msg_pid;
2812 c.seq = hdr->sadb_msg_seq;
2813 c.net = net;
2814 km_policy_notify(NULL, 0, &c);
2815
2816 return 0;
2817 }
2818
2819 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2820 const struct sadb_msg *hdr, void * const *ext_hdrs);
2821 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2822 [SADB_RESERVED] = pfkey_reserved,
2823 [SADB_GETSPI] = pfkey_getspi,
2824 [SADB_UPDATE] = pfkey_add,
2825 [SADB_ADD] = pfkey_add,
2826 [SADB_DELETE] = pfkey_delete,
2827 [SADB_GET] = pfkey_get,
2828 [SADB_ACQUIRE] = pfkey_acquire,
2829 [SADB_REGISTER] = pfkey_register,
2830 [SADB_EXPIRE] = NULL,
2831 [SADB_FLUSH] = pfkey_flush,
2832 [SADB_DUMP] = pfkey_dump,
2833 [SADB_X_PROMISC] = pfkey_promisc,
2834 [SADB_X_PCHANGE] = NULL,
2835 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2836 [SADB_X_SPDADD] = pfkey_spdadd,
2837 [SADB_X_SPDDELETE] = pfkey_spddelete,
2838 [SADB_X_SPDGET] = pfkey_spdget,
2839 [SADB_X_SPDACQUIRE] = NULL,
2840 [SADB_X_SPDDUMP] = pfkey_spddump,
2841 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2842 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2843 [SADB_X_SPDDELETE2] = pfkey_spdget,
2844 [SADB_X_MIGRATE] = pfkey_migrate,
2845 };
2846
pfkey_process(struct sock * sk,struct sk_buff * skb,const struct sadb_msg * hdr)2847 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2848 {
2849 void *ext_hdrs[SADB_EXT_MAX];
2850 int err;
2851
2852 /* Non-zero return value of pfkey_broadcast() does not always signal
2853 * an error and even on an actual error we may still want to process
2854 * the message so rather ignore the return value.
2855 */
2856 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2857 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2858
2859 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2860 err = parse_exthdrs(skb, hdr, ext_hdrs);
2861 if (!err) {
2862 err = -EOPNOTSUPP;
2863 if (pfkey_funcs[hdr->sadb_msg_type])
2864 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2865 }
2866 return err;
2867 }
2868
pfkey_get_base_msg(struct sk_buff * skb,int * errp)2869 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2870 {
2871 struct sadb_msg *hdr = NULL;
2872
2873 if (skb->len < sizeof(*hdr)) {
2874 *errp = -EMSGSIZE;
2875 } else {
2876 hdr = (struct sadb_msg *) skb->data;
2877 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2878 hdr->sadb_msg_reserved != 0 ||
2879 (hdr->sadb_msg_type <= SADB_RESERVED ||
2880 hdr->sadb_msg_type > SADB_MAX)) {
2881 hdr = NULL;
2882 *errp = -EINVAL;
2883 } else if (hdr->sadb_msg_len != (skb->len /
2884 sizeof(uint64_t)) ||
2885 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2886 sizeof(uint64_t))) {
2887 hdr = NULL;
2888 *errp = -EMSGSIZE;
2889 } else {
2890 *errp = 0;
2891 }
2892 }
2893 return hdr;
2894 }
2895
aalg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2896 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2897 const struct xfrm_algo_desc *d)
2898 {
2899 unsigned int id = d->desc.sadb_alg_id;
2900
2901 if (id >= sizeof(t->aalgos) * 8)
2902 return 0;
2903
2904 return (t->aalgos >> id) & 1;
2905 }
2906
ealg_tmpl_set(const struct xfrm_tmpl * t,const struct xfrm_algo_desc * d)2907 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2908 const struct xfrm_algo_desc *d)
2909 {
2910 unsigned int id = d->desc.sadb_alg_id;
2911
2912 if (id >= sizeof(t->ealgos) * 8)
2913 return 0;
2914
2915 return (t->ealgos >> id) & 1;
2916 }
2917
count_ah_combs(const struct xfrm_tmpl * t)2918 static int count_ah_combs(const struct xfrm_tmpl *t)
2919 {
2920 int i, sz = 0;
2921
2922 for (i = 0; ; i++) {
2923 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2924 if (!aalg)
2925 break;
2926 if (!aalg->pfkey_supported)
2927 continue;
2928 if (aalg_tmpl_set(t, aalg))
2929 sz += sizeof(struct sadb_comb);
2930 }
2931 return sz + sizeof(struct sadb_prop);
2932 }
2933
count_esp_combs(const struct xfrm_tmpl * t)2934 static int count_esp_combs(const struct xfrm_tmpl *t)
2935 {
2936 int i, k, sz = 0;
2937
2938 for (i = 0; ; i++) {
2939 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2940 if (!ealg)
2941 break;
2942
2943 if (!ealg->pfkey_supported)
2944 continue;
2945
2946 if (!(ealg_tmpl_set(t, ealg)))
2947 continue;
2948
2949 for (k = 1; ; k++) {
2950 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2951 if (!aalg)
2952 break;
2953
2954 if (!aalg->pfkey_supported)
2955 continue;
2956
2957 if (aalg_tmpl_set(t, aalg))
2958 sz += sizeof(struct sadb_comb);
2959 }
2960 }
2961 return sz + sizeof(struct sadb_prop);
2962 }
2963
dump_ah_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)2964 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2965 {
2966 struct sadb_prop *p;
2967 int sz = 0;
2968 int i;
2969
2970 p = skb_put(skb, sizeof(struct sadb_prop));
2971 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2972 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2973 p->sadb_prop_replay = 32;
2974 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2975
2976 for (i = 0; ; i++) {
2977 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2978 if (!aalg)
2979 break;
2980
2981 if (!aalg->pfkey_supported)
2982 continue;
2983
2984 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2985 struct sadb_comb *c;
2986 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2987 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2988 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2989 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2990 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2991 c->sadb_comb_hard_addtime = 24*60*60;
2992 c->sadb_comb_soft_addtime = 20*60*60;
2993 c->sadb_comb_hard_usetime = 8*60*60;
2994 c->sadb_comb_soft_usetime = 7*60*60;
2995 sz += sizeof(*c);
2996 }
2997 }
2998
2999 return sz + sizeof(*p);
3000 }
3001
dump_esp_combs(struct sk_buff * skb,const struct xfrm_tmpl * t)3002 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
3003 {
3004 struct sadb_prop *p;
3005 int sz = 0;
3006 int i, k;
3007
3008 p = skb_put(skb, sizeof(struct sadb_prop));
3009 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
3010 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
3011 p->sadb_prop_replay = 32;
3012 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3013
3014 for (i=0; ; i++) {
3015 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3016 if (!ealg)
3017 break;
3018
3019 if (!ealg->pfkey_supported)
3020 continue;
3021
3022 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3023 continue;
3024
3025 for (k = 1; ; k++) {
3026 struct sadb_comb *c;
3027 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3028 if (!aalg)
3029 break;
3030 if (!aalg->pfkey_supported)
3031 continue;
3032 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3033 continue;
3034 c = skb_put(skb, sizeof(struct sadb_comb));
3035 memset(c, 0, sizeof(*c));
3036 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3037 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3038 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3039 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3040 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3041 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3042 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3043 c->sadb_comb_hard_addtime = 24*60*60;
3044 c->sadb_comb_soft_addtime = 20*60*60;
3045 c->sadb_comb_hard_usetime = 8*60*60;
3046 c->sadb_comb_soft_usetime = 7*60*60;
3047 sz += sizeof(*c);
3048 }
3049 }
3050
3051 return sz + sizeof(*p);
3052 }
3053
key_notify_policy_expire(struct xfrm_policy * xp,const struct km_event * c)3054 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3055 {
3056 return 0;
3057 }
3058
key_notify_sa_expire(struct xfrm_state * x,const struct km_event * c)3059 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3060 {
3061 struct sk_buff *out_skb;
3062 struct sadb_msg *out_hdr;
3063 int hard;
3064 int hsc;
3065
3066 hard = c->data.hard;
3067 if (hard)
3068 hsc = 2;
3069 else
3070 hsc = 1;
3071
3072 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3073 if (IS_ERR(out_skb))
3074 return PTR_ERR(out_skb);
3075
3076 out_hdr = (struct sadb_msg *) out_skb->data;
3077 out_hdr->sadb_msg_version = PF_KEY_V2;
3078 out_hdr->sadb_msg_type = SADB_EXPIRE;
3079 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3080 out_hdr->sadb_msg_errno = 0;
3081 out_hdr->sadb_msg_reserved = 0;
3082 out_hdr->sadb_msg_seq = 0;
3083 out_hdr->sadb_msg_pid = 0;
3084
3085 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3086 xs_net(x));
3087 return 0;
3088 }
3089
pfkey_send_notify(struct xfrm_state * x,const struct km_event * c)3090 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3091 {
3092 struct net *net = x ? xs_net(x) : c->net;
3093 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3094
3095 if (atomic_read(&net_pfkey->socks_nr) == 0)
3096 return 0;
3097
3098 switch (c->event) {
3099 case XFRM_MSG_EXPIRE:
3100 return key_notify_sa_expire(x, c);
3101 case XFRM_MSG_DELSA:
3102 case XFRM_MSG_NEWSA:
3103 case XFRM_MSG_UPDSA:
3104 return key_notify_sa(x, c);
3105 case XFRM_MSG_FLUSHSA:
3106 return key_notify_sa_flush(c);
3107 case XFRM_MSG_NEWAE: /* not yet supported */
3108 break;
3109 default:
3110 pr_err("pfkey: Unknown SA event %d\n", c->event);
3111 break;
3112 }
3113
3114 return 0;
3115 }
3116
pfkey_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3117 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3118 {
3119 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3120 return 0;
3121
3122 switch (c->event) {
3123 case XFRM_MSG_POLEXPIRE:
3124 return key_notify_policy_expire(xp, c);
3125 case XFRM_MSG_DELPOLICY:
3126 case XFRM_MSG_NEWPOLICY:
3127 case XFRM_MSG_UPDPOLICY:
3128 return key_notify_policy(xp, dir, c);
3129 case XFRM_MSG_FLUSHPOLICY:
3130 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3131 break;
3132 return key_notify_policy_flush(c);
3133 default:
3134 pr_err("pfkey: Unknown policy event %d\n", c->event);
3135 break;
3136 }
3137
3138 return 0;
3139 }
3140
get_acqseq(void)3141 static u32 get_acqseq(void)
3142 {
3143 u32 res;
3144 static atomic_t acqseq;
3145
3146 do {
3147 res = atomic_inc_return(&acqseq);
3148 } while (!res);
3149 return res;
3150 }
3151
pfkey_is_alive(const struct km_event * c)3152 static bool pfkey_is_alive(const struct km_event *c)
3153 {
3154 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3155 struct sock *sk;
3156 bool is_alive = false;
3157
3158 rcu_read_lock();
3159 sk_for_each_rcu(sk, &net_pfkey->table) {
3160 if (pfkey_sk(sk)->registered) {
3161 is_alive = true;
3162 break;
3163 }
3164 }
3165 rcu_read_unlock();
3166
3167 return is_alive;
3168 }
3169
pfkey_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * t,struct xfrm_policy * xp)3170 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3171 {
3172 struct sk_buff *skb;
3173 struct sadb_msg *hdr;
3174 struct sadb_address *addr;
3175 struct sadb_x_policy *pol;
3176 int sockaddr_size;
3177 int size;
3178 struct sadb_x_sec_ctx *sec_ctx;
3179 struct xfrm_sec_ctx *xfrm_ctx;
3180 int ctx_size = 0;
3181 int alg_size = 0;
3182
3183 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3184 if (!sockaddr_size)
3185 return -EINVAL;
3186
3187 size = sizeof(struct sadb_msg) +
3188 (sizeof(struct sadb_address) * 2) +
3189 (sockaddr_size * 2) +
3190 sizeof(struct sadb_x_policy);
3191
3192 if (x->id.proto == IPPROTO_AH)
3193 alg_size = count_ah_combs(t);
3194 else if (x->id.proto == IPPROTO_ESP)
3195 alg_size = count_esp_combs(t);
3196
3197 if ((xfrm_ctx = x->security)) {
3198 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3199 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3200 }
3201
3202 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3203 if (skb == NULL)
3204 return -ENOMEM;
3205
3206 hdr = skb_put(skb, sizeof(struct sadb_msg));
3207 hdr->sadb_msg_version = PF_KEY_V2;
3208 hdr->sadb_msg_type = SADB_ACQUIRE;
3209 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3210 hdr->sadb_msg_len = size / sizeof(uint64_t);
3211 hdr->sadb_msg_errno = 0;
3212 hdr->sadb_msg_reserved = 0;
3213 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3214 hdr->sadb_msg_pid = 0;
3215
3216 /* src address */
3217 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3218 addr->sadb_address_len =
3219 (sizeof(struct sadb_address)+sockaddr_size)/
3220 sizeof(uint64_t);
3221 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3222 addr->sadb_address_proto = 0;
3223 addr->sadb_address_reserved = 0;
3224 addr->sadb_address_prefixlen =
3225 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0,
3226 (struct sockaddr *)(addr + 1),
3227 x->props.family);
3228 if (!addr->sadb_address_prefixlen)
3229 BUG();
3230
3231 /* dst address */
3232 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3233 addr->sadb_address_len =
3234 (sizeof(struct sadb_address)+sockaddr_size)/
3235 sizeof(uint64_t);
3236 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3237 addr->sadb_address_proto = 0;
3238 addr->sadb_address_reserved = 0;
3239 addr->sadb_address_prefixlen =
3240 pfkey_sockaddr_fill_zero_tail(&x->id.daddr, 0,
3241 (struct sockaddr *)(addr + 1),
3242 x->props.family);
3243 if (!addr->sadb_address_prefixlen)
3244 BUG();
3245
3246 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3247 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3248 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3249 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3250 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3251 pol->sadb_x_policy_reserved = 0;
3252 pol->sadb_x_policy_id = xp->index;
3253 pol->sadb_x_policy_priority = xp->priority;
3254
3255 /* Set sadb_comb's. */
3256 alg_size = 0;
3257 if (x->id.proto == IPPROTO_AH)
3258 alg_size = dump_ah_combs(skb, t);
3259 else if (x->id.proto == IPPROTO_ESP)
3260 alg_size = dump_esp_combs(skb, t);
3261
3262 hdr->sadb_msg_len += alg_size / 8;
3263
3264 /* security context */
3265 if (xfrm_ctx) {
3266 sec_ctx = skb_put(skb,
3267 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3268 sec_ctx->sadb_x_sec_len =
3269 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3270 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3271 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3272 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3273 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3274 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3275 xfrm_ctx->ctx_len);
3276 }
3277
3278 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3279 xs_net(x));
3280 }
3281
pfkey_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3282 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3283 u8 *data, int len, int *dir)
3284 {
3285 struct net *net = sock_net(sk);
3286 struct xfrm_policy *xp;
3287 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3288 struct sadb_x_sec_ctx *sec_ctx;
3289
3290 switch (sk->sk_family) {
3291 case AF_INET:
3292 if (opt != IP_IPSEC_POLICY) {
3293 *dir = -EOPNOTSUPP;
3294 return NULL;
3295 }
3296 break;
3297 #if IS_ENABLED(CONFIG_IPV6)
3298 case AF_INET6:
3299 if (opt != IPV6_IPSEC_POLICY) {
3300 *dir = -EOPNOTSUPP;
3301 return NULL;
3302 }
3303 break;
3304 #endif
3305 default:
3306 *dir = -EINVAL;
3307 return NULL;
3308 }
3309
3310 *dir = -EINVAL;
3311
3312 if (len < sizeof(struct sadb_x_policy) ||
3313 pol->sadb_x_policy_len*8 > len ||
3314 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3315 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3316 return NULL;
3317
3318 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3319 if (xp == NULL) {
3320 *dir = -ENOBUFS;
3321 return NULL;
3322 }
3323
3324 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3325 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3326
3327 xp->lft.soft_byte_limit = XFRM_INF;
3328 xp->lft.hard_byte_limit = XFRM_INF;
3329 xp->lft.soft_packet_limit = XFRM_INF;
3330 xp->lft.hard_packet_limit = XFRM_INF;
3331 xp->family = sk->sk_family;
3332
3333 xp->xfrm_nr = 0;
3334 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3335 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3336 goto out;
3337
3338 /* security context too */
3339 if (len >= (pol->sadb_x_policy_len*8 +
3340 sizeof(struct sadb_x_sec_ctx))) {
3341 char *p = (char *)pol;
3342 struct xfrm_user_sec_ctx *uctx;
3343
3344 p += pol->sadb_x_policy_len*8;
3345 sec_ctx = (struct sadb_x_sec_ctx *)p;
3346 if (len < pol->sadb_x_policy_len*8 +
3347 sec_ctx->sadb_x_sec_len*8) {
3348 *dir = -EINVAL;
3349 goto out;
3350 }
3351 if ((*dir = verify_sec_ctx_len(p)))
3352 goto out;
3353 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3354 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3355 kfree(uctx);
3356
3357 if (*dir)
3358 goto out;
3359 }
3360
3361 *dir = pol->sadb_x_policy_dir-1;
3362 return xp;
3363
3364 out:
3365 xp->walk.dead = 1;
3366 xfrm_policy_destroy(xp);
3367 return NULL;
3368 }
3369
pfkey_send_new_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3370 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3371 {
3372 struct sk_buff *skb;
3373 struct sadb_msg *hdr;
3374 struct sadb_sa *sa;
3375 struct sadb_address *addr;
3376 struct sadb_x_nat_t_port *n_port;
3377 int sockaddr_size;
3378 int size;
3379 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3380 struct xfrm_encap_tmpl *natt = NULL;
3381
3382 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3383 if (!sockaddr_size)
3384 return -EINVAL;
3385
3386 if (!satype)
3387 return -EINVAL;
3388
3389 if (!x->encap)
3390 return -EINVAL;
3391
3392 natt = x->encap;
3393
3394 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3395 *
3396 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3397 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3398 */
3399
3400 size = sizeof(struct sadb_msg) +
3401 sizeof(struct sadb_sa) +
3402 (sizeof(struct sadb_address) * 2) +
3403 (sockaddr_size * 2) +
3404 (sizeof(struct sadb_x_nat_t_port) * 2);
3405
3406 skb = alloc_skb(size + 16, GFP_ATOMIC);
3407 if (skb == NULL)
3408 return -ENOMEM;
3409
3410 hdr = skb_put(skb, sizeof(struct sadb_msg));
3411 hdr->sadb_msg_version = PF_KEY_V2;
3412 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3413 hdr->sadb_msg_satype = satype;
3414 hdr->sadb_msg_len = size / sizeof(uint64_t);
3415 hdr->sadb_msg_errno = 0;
3416 hdr->sadb_msg_reserved = 0;
3417 hdr->sadb_msg_seq = x->km.seq;
3418 hdr->sadb_msg_pid = 0;
3419
3420 /* SA */
3421 sa = skb_put(skb, sizeof(struct sadb_sa));
3422 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3423 sa->sadb_sa_exttype = SADB_EXT_SA;
3424 sa->sadb_sa_spi = x->id.spi;
3425 sa->sadb_sa_replay = 0;
3426 sa->sadb_sa_state = 0;
3427 sa->sadb_sa_auth = 0;
3428 sa->sadb_sa_encrypt = 0;
3429 sa->sadb_sa_flags = 0;
3430
3431 /* ADDRESS_SRC (old addr) */
3432 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3433 addr->sadb_address_len =
3434 (sizeof(struct sadb_address)+sockaddr_size)/
3435 sizeof(uint64_t);
3436 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3437 addr->sadb_address_proto = 0;
3438 addr->sadb_address_reserved = 0;
3439 addr->sadb_address_prefixlen =
3440 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0,
3441 (struct sockaddr *)(addr + 1),
3442 x->props.family);
3443 if (!addr->sadb_address_prefixlen)
3444 BUG();
3445
3446 /* NAT_T_SPORT (old port) */
3447 n_port = skb_put(skb, sizeof(*n_port));
3448 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3449 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3450 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3451 n_port->sadb_x_nat_t_port_reserved = 0;
3452
3453 /* ADDRESS_DST (new addr) */
3454 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3455 addr->sadb_address_len =
3456 (sizeof(struct sadb_address)+sockaddr_size)/
3457 sizeof(uint64_t);
3458 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3459 addr->sadb_address_proto = 0;
3460 addr->sadb_address_reserved = 0;
3461 addr->sadb_address_prefixlen =
3462 pfkey_sockaddr_fill_zero_tail(ipaddr, 0,
3463 (struct sockaddr *)(addr + 1),
3464 x->props.family);
3465 if (!addr->sadb_address_prefixlen)
3466 BUG();
3467
3468 /* NAT_T_DPORT (new port) */
3469 n_port = skb_put(skb, sizeof(*n_port));
3470 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3471 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3472 n_port->sadb_x_nat_t_port_port = sport;
3473 n_port->sadb_x_nat_t_port_reserved = 0;
3474
3475 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3476 xs_net(x));
3477 }
3478
3479 #ifdef CONFIG_NET_KEY_MIGRATE
set_sadb_address(struct sk_buff * skb,int sasize,int type,const struct xfrm_selector * sel)3480 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3481 const struct xfrm_selector *sel)
3482 {
3483 struct sadb_address *addr;
3484 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3485 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3486 addr->sadb_address_exttype = type;
3487 addr->sadb_address_proto = sel->proto;
3488 addr->sadb_address_reserved = 0;
3489
3490 switch (type) {
3491 case SADB_EXT_ADDRESS_SRC:
3492 addr->sadb_address_prefixlen = sel->prefixlen_s;
3493 pfkey_sockaddr_fill_zero_tail(&sel->saddr, 0,
3494 (struct sockaddr *)(addr + 1),
3495 sel->family);
3496 break;
3497 case SADB_EXT_ADDRESS_DST:
3498 addr->sadb_address_prefixlen = sel->prefixlen_d;
3499 pfkey_sockaddr_fill_zero_tail(&sel->daddr, 0,
3500 (struct sockaddr *)(addr + 1),
3501 sel->family);
3502 break;
3503 default:
3504 return -EINVAL;
3505 }
3506
3507 return 0;
3508 }
3509
3510
set_sadb_kmaddress(struct sk_buff * skb,const struct xfrm_kmaddress * k)3511 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3512 {
3513 struct sadb_x_kmaddress *kma;
3514 u8 *sa;
3515 int family = k->family;
3516 int socklen = pfkey_sockaddr_len(family);
3517 int size_req;
3518
3519 size_req = (sizeof(struct sadb_x_kmaddress) +
3520 pfkey_sockaddr_pair_size(family));
3521
3522 kma = skb_put_zero(skb, size_req);
3523 kma->sadb_x_kmaddress_len = size_req / 8;
3524 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3525 kma->sadb_x_kmaddress_reserved = k->reserved;
3526
3527 sa = (u8 *)(kma + 1);
3528 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3529 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3530 return -EINVAL;
3531
3532 return 0;
3533 }
3534
set_ipsecrequest(struct sk_buff * skb,uint8_t proto,uint8_t mode,int level,uint32_t reqid,sa_family_t family,const xfrm_address_t * src,const xfrm_address_t * dst)3535 static int set_ipsecrequest(struct sk_buff *skb,
3536 uint8_t proto, uint8_t mode, int level,
3537 uint32_t reqid, sa_family_t family,
3538 const xfrm_address_t *src, const xfrm_address_t *dst)
3539 {
3540 struct sadb_x_ipsecrequest *rq;
3541 u8 *sa;
3542 int socklen = pfkey_sockaddr_len(family);
3543 int size_req;
3544
3545 size_req = sizeof(struct sadb_x_ipsecrequest) +
3546 pfkey_sockaddr_pair_size(family);
3547
3548 rq = skb_put_zero(skb, size_req);
3549 rq->sadb_x_ipsecrequest_len = size_req;
3550 rq->sadb_x_ipsecrequest_proto = proto;
3551 rq->sadb_x_ipsecrequest_mode = mode;
3552 rq->sadb_x_ipsecrequest_level = level;
3553 rq->sadb_x_ipsecrequest_reqid = reqid;
3554
3555 sa = (u8 *) (rq + 1);
3556 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3557 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3558 return -EINVAL;
3559
3560 return 0;
3561 }
3562 #endif
3563
3564 #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)3565 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3566 const struct xfrm_migrate *m, int num_bundles,
3567 const struct xfrm_kmaddress *k,
3568 const struct xfrm_encap_tmpl *encap)
3569 {
3570 int i;
3571 int sasize_sel;
3572 int size = 0;
3573 int size_pol = 0;
3574 struct sk_buff *skb;
3575 struct sadb_msg *hdr;
3576 struct sadb_x_policy *pol;
3577 const struct xfrm_migrate *mp;
3578
3579 if (type != XFRM_POLICY_TYPE_MAIN)
3580 return 0;
3581
3582 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3583 return -EINVAL;
3584
3585 if (k != NULL) {
3586 /* addresses for KM */
3587 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3588 pfkey_sockaddr_pair_size(k->family));
3589 }
3590
3591 /* selector */
3592 sasize_sel = pfkey_sockaddr_size(sel->family);
3593 if (!sasize_sel)
3594 return -EINVAL;
3595 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3596
3597 /* policy info */
3598 size_pol += sizeof(struct sadb_x_policy);
3599
3600 /* ipsecrequests */
3601 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3602 int pair_size;
3603
3604 pair_size = pfkey_sockaddr_pair_size(mp->old_family);
3605 if (!pair_size)
3606 return -EINVAL;
3607 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size;
3608
3609 pair_size = pfkey_sockaddr_pair_size(mp->new_family);
3610 if (!pair_size)
3611 return -EINVAL;
3612 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size;
3613 }
3614
3615 size += sizeof(struct sadb_msg) + size_pol;
3616
3617 /* alloc buffer */
3618 skb = alloc_skb(size, GFP_ATOMIC);
3619 if (skb == NULL)
3620 return -ENOMEM;
3621
3622 hdr = skb_put(skb, sizeof(struct sadb_msg));
3623 hdr->sadb_msg_version = PF_KEY_V2;
3624 hdr->sadb_msg_type = SADB_X_MIGRATE;
3625 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3626 hdr->sadb_msg_len = size / 8;
3627 hdr->sadb_msg_errno = 0;
3628 hdr->sadb_msg_reserved = 0;
3629 hdr->sadb_msg_seq = 0;
3630 hdr->sadb_msg_pid = 0;
3631
3632 /* Addresses to be used by KM for negotiation, if ext is available */
3633 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3634 goto err;
3635
3636 /* selector src */
3637 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3638
3639 /* selector dst */
3640 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3641
3642 /* policy information */
3643 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3644 pol->sadb_x_policy_len = size_pol / 8;
3645 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3646 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3647 pol->sadb_x_policy_dir = dir + 1;
3648 pol->sadb_x_policy_reserved = 0;
3649 pol->sadb_x_policy_id = 0;
3650 pol->sadb_x_policy_priority = 0;
3651
3652 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3653 /* old ipsecrequest */
3654 int mode = pfkey_mode_from_xfrm(mp->mode);
3655 if (mode < 0)
3656 goto err;
3657 if (set_ipsecrequest(skb, mp->proto, mode,
3658 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3659 mp->reqid, mp->old_family,
3660 &mp->old_saddr, &mp->old_daddr) < 0)
3661 goto err;
3662
3663 /* new ipsecrequest */
3664 if (set_ipsecrequest(skb, mp->proto, mode,
3665 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3666 mp->reqid, mp->new_family,
3667 &mp->new_saddr, &mp->new_daddr) < 0)
3668 goto err;
3669 }
3670
3671 /* broadcast migrate message to sockets */
3672 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3673
3674 return 0;
3675
3676 err:
3677 kfree_skb(skb);
3678 return -EINVAL;
3679 }
3680 #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)3681 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3682 const struct xfrm_migrate *m, int num_bundles,
3683 const struct xfrm_kmaddress *k,
3684 const struct xfrm_encap_tmpl *encap)
3685 {
3686 return -ENOPROTOOPT;
3687 }
3688 #endif
3689
pfkey_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)3690 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3691 {
3692 struct sock *sk = sock->sk;
3693 struct sk_buff *skb = NULL;
3694 struct sadb_msg *hdr = NULL;
3695 int err;
3696 struct net *net = sock_net(sk);
3697
3698 err = -EOPNOTSUPP;
3699 if (msg->msg_flags & MSG_OOB)
3700 goto out;
3701
3702 err = -EMSGSIZE;
3703 if ((unsigned int)len > sk->sk_sndbuf - 32)
3704 goto out;
3705
3706 err = -ENOBUFS;
3707 skb = alloc_skb(len, GFP_KERNEL);
3708 if (skb == NULL)
3709 goto out;
3710
3711 err = -EFAULT;
3712 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3713 goto out;
3714
3715 hdr = pfkey_get_base_msg(skb, &err);
3716 if (!hdr)
3717 goto out;
3718
3719 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3720 err = pfkey_process(sk, skb, hdr);
3721 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3722
3723 out:
3724 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3725 err = 0;
3726 kfree_skb(skb);
3727
3728 return err ? : len;
3729 }
3730
pfkey_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)3731 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3732 int flags)
3733 {
3734 struct sock *sk = sock->sk;
3735 struct pfkey_sock *pfk = pfkey_sk(sk);
3736 struct sk_buff *skb;
3737 int copied, err;
3738
3739 err = -EINVAL;
3740 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3741 goto out;
3742
3743 skb = skb_recv_datagram(sk, flags, &err);
3744 if (skb == NULL)
3745 goto out;
3746
3747 copied = skb->len;
3748 if (copied > len) {
3749 msg->msg_flags |= MSG_TRUNC;
3750 copied = len;
3751 }
3752
3753 skb_reset_transport_header(skb);
3754 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3755 if (err)
3756 goto out_free;
3757
3758 sock_recv_cmsgs(msg, sk, skb);
3759
3760 err = (flags & MSG_TRUNC) ? skb->len : copied;
3761
3762 if (pfk->dump.dump != NULL &&
3763 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3764 pfkey_do_dump(pfk);
3765
3766 out_free:
3767 skb_free_datagram(sk, skb);
3768 out:
3769 return err;
3770 }
3771
3772 static const struct proto_ops pfkey_ops = {
3773 .family = PF_KEY,
3774 .owner = THIS_MODULE,
3775 /* Operations that make no sense on pfkey sockets. */
3776 .bind = sock_no_bind,
3777 .connect = sock_no_connect,
3778 .socketpair = sock_no_socketpair,
3779 .accept = sock_no_accept,
3780 .getname = sock_no_getname,
3781 .ioctl = sock_no_ioctl,
3782 .listen = sock_no_listen,
3783 .shutdown = sock_no_shutdown,
3784 .mmap = sock_no_mmap,
3785
3786 /* Now the operations that really occur. */
3787 .release = pfkey_release,
3788 .poll = datagram_poll,
3789 .sendmsg = pfkey_sendmsg,
3790 .recvmsg = pfkey_recvmsg,
3791 };
3792
3793 static const struct net_proto_family pfkey_family_ops = {
3794 .family = PF_KEY,
3795 .create = pfkey_create,
3796 .owner = THIS_MODULE,
3797 };
3798
3799 #ifdef CONFIG_PROC_FS
pfkey_seq_show(struct seq_file * f,void * v)3800 static int pfkey_seq_show(struct seq_file *f, void *v)
3801 {
3802 struct sock *s = sk_entry(v);
3803
3804 if (v == SEQ_START_TOKEN)
3805 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3806 else
3807 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3808 s,
3809 refcount_read(&s->sk_refcnt),
3810 sk_rmem_alloc_get(s),
3811 sk_wmem_alloc_get(s),
3812 from_kuid_munged(seq_user_ns(f), sk_uid(s)),
3813 sock_i_ino(s)
3814 );
3815 return 0;
3816 }
3817
pfkey_seq_start(struct seq_file * f,loff_t * ppos)3818 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3819 __acquires(rcu)
3820 {
3821 struct net *net = seq_file_net(f);
3822 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3823
3824 rcu_read_lock();
3825 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3826 }
3827
pfkey_seq_next(struct seq_file * f,void * v,loff_t * ppos)3828 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3829 {
3830 struct net *net = seq_file_net(f);
3831 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3832
3833 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3834 }
3835
pfkey_seq_stop(struct seq_file * f,void * v)3836 static void pfkey_seq_stop(struct seq_file *f, void *v)
3837 __releases(rcu)
3838 {
3839 rcu_read_unlock();
3840 }
3841
3842 static const struct seq_operations pfkey_seq_ops = {
3843 .start = pfkey_seq_start,
3844 .next = pfkey_seq_next,
3845 .stop = pfkey_seq_stop,
3846 .show = pfkey_seq_show,
3847 };
3848
pfkey_init_proc(struct net * net)3849 static int __net_init pfkey_init_proc(struct net *net)
3850 {
3851 struct proc_dir_entry *e;
3852
3853 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3854 sizeof(struct seq_net_private));
3855 if (e == NULL)
3856 return -ENOMEM;
3857
3858 return 0;
3859 }
3860
pfkey_exit_proc(struct net * net)3861 static void __net_exit pfkey_exit_proc(struct net *net)
3862 {
3863 remove_proc_entry("pfkey", net->proc_net);
3864 }
3865 #else
pfkey_init_proc(struct net * net)3866 static inline int pfkey_init_proc(struct net *net)
3867 {
3868 return 0;
3869 }
3870
pfkey_exit_proc(struct net * net)3871 static inline void pfkey_exit_proc(struct net *net)
3872 {
3873 }
3874 #endif
3875
3876 static struct xfrm_mgr pfkeyv2_mgr =
3877 {
3878 .notify = pfkey_send_notify,
3879 .acquire = pfkey_send_acquire,
3880 .compile_policy = pfkey_compile_policy,
3881 .new_mapping = pfkey_send_new_mapping,
3882 .notify_policy = pfkey_send_policy_notify,
3883 .migrate = pfkey_send_migrate,
3884 .is_alive = pfkey_is_alive,
3885 };
3886
pfkey_net_init(struct net * net)3887 static int __net_init pfkey_net_init(struct net *net)
3888 {
3889 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3890 int rv;
3891
3892 INIT_HLIST_HEAD(&net_pfkey->table);
3893 atomic_set(&net_pfkey->socks_nr, 0);
3894
3895 rv = pfkey_init_proc(net);
3896
3897 return rv;
3898 }
3899
pfkey_net_exit(struct net * net)3900 static void __net_exit pfkey_net_exit(struct net *net)
3901 {
3902 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3903
3904 pfkey_exit_proc(net);
3905 WARN_ON(!hlist_empty(&net_pfkey->table));
3906 }
3907
3908 static struct pernet_operations pfkey_net_ops = {
3909 .init = pfkey_net_init,
3910 .exit = pfkey_net_exit,
3911 .id = &pfkey_net_id,
3912 .size = sizeof(struct netns_pfkey),
3913 };
3914
ipsec_pfkey_exit(void)3915 static void __exit ipsec_pfkey_exit(void)
3916 {
3917 xfrm_unregister_km(&pfkeyv2_mgr);
3918 sock_unregister(PF_KEY);
3919 unregister_pernet_subsys(&pfkey_net_ops);
3920 proto_unregister(&key_proto);
3921 }
3922
ipsec_pfkey_init(void)3923 static int __init ipsec_pfkey_init(void)
3924 {
3925 int err = proto_register(&key_proto, 0);
3926
3927 pr_warn_once("PFKEY is deprecated and scheduled to be removed in 2027, "
3928 "please contact the netdev mailing list\n");
3929 if (err != 0)
3930 goto out;
3931
3932 err = register_pernet_subsys(&pfkey_net_ops);
3933 if (err != 0)
3934 goto out_unregister_key_proto;
3935 err = sock_register(&pfkey_family_ops);
3936 if (err != 0)
3937 goto out_unregister_pernet;
3938 xfrm_register_km(&pfkeyv2_mgr);
3939 out:
3940 return err;
3941
3942 out_unregister_pernet:
3943 unregister_pernet_subsys(&pfkey_net_ops);
3944 out_unregister_key_proto:
3945 proto_unregister(&key_proto);
3946 goto out;
3947 }
3948
3949 module_init(ipsec_pfkey_init);
3950 module_exit(ipsec_pfkey_exit);
3951 MODULE_DESCRIPTION("PF_KEY socket helpers");
3952 MODULE_LICENSE("GPL");
3953 MODULE_ALIAS_NETPROTO(PF_KEY);
3954