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