projects/linux·blob master · refs

3954 lines · 102.1 KiB

1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/key/af_key.c An implementation of PF_KEYv2 sockets.
4 *
5 * Authors: Maxim Giryaev <[email protected]>
6 * David S. Miller <[email protected]>
7 * Alexey Kuznetsov <[email protected]>
8 * Kunihiro Ishiguro <[email protected]>
9 * Kazunori MIYAZAWA / USAGI Project <[email protected]>
10 * Derek Atkins <[email protected]>
11 */
12
13#include <linux/capability.h>
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/socket.h>
17#include <linux/pfkeyv2.h>
18#include <linux/ipsec.h>
19#include <linux/skbuff.h>
20#include <linux/rtnetlink.h>
21#include <linux/in.h>
22#include <linux/in6.h>
23#include <linux/proc_fs.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <net/net_namespace.h>
27#include <net/netns/generic.h>
28#include <net/xfrm.h>
29
30#include <net/sock.h>
31
32#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
33#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
34
35static unsigned int pfkey_net_id __read_mostly;
36struct netns_pfkey {
37 /* List of all pfkey sockets. */
38 struct hlist_head table;
39 atomic_t socks_nr;
40};
41static DEFINE_MUTEX(pfkey_mutex);
42
43#define DUMMY_MARK 0
44static const struct xfrm_mark dummy_mark = {0, 0};
45struct pfkey_sock {
46 /* struct sock must be the first member of struct pfkey_sock */
47 struct sock sk;
48 int registered;
49 int promisc;
50
51 struct {
52 uint8_t msg_version;
53 uint32_t msg_portid;
54 int (*dump)(struct pfkey_sock *sk);
55 void (*done)(struct pfkey_sock *sk);
56 union {
57 struct xfrm_policy_walk policy;
58 struct xfrm_state_walk state;
59 } u;
60 struct sk_buff *skb;
61 } dump;
62 struct mutex dump_lock;
63};
64
65static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
66 xfrm_address_t *saddr, xfrm_address_t *daddr,
67 u16 *family);
68
69static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
70{
71 return (struct pfkey_sock *)sk;
72}
73
74static int pfkey_can_dump(const struct sock *sk)
75{
76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
77 return 1;
78 return 0;
79}
80
81static void pfkey_terminate_dump(struct pfkey_sock *pfk)
82{
83 if (pfk->dump.dump) {
84 if (pfk->dump.skb) {
85 kfree_skb(pfk->dump.skb);
86 pfk->dump.skb = NULL;
87 }
88 pfk->dump.done(pfk);
89 pfk->dump.dump = NULL;
90 pfk->dump.done = NULL;
91 }
92}
93
94static void pfkey_sock_destruct(struct sock *sk)
95{
96 struct net *net = sock_net(sk);
97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
98
99 pfkey_terminate_dump(pfkey_sk(sk));
100 skb_queue_purge(&sk->sk_receive_queue);
101
102 if (!sock_flag(sk, SOCK_DEAD)) {
103 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
104 return;
105 }
106
107 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
108 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
109
110 atomic_dec(&net_pfkey->socks_nr);
111}
112
113static const struct proto_ops pfkey_ops;
114
115static void pfkey_insert(struct sock *sk)
116{
117 struct net *net = sock_net(sk);
118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
119
120 mutex_lock(&pfkey_mutex);
121 sk_add_node_rcu(sk, &net_pfkey->table);
122 mutex_unlock(&pfkey_mutex);
123}
124
125static void pfkey_remove(struct sock *sk)
126{
127 mutex_lock(&pfkey_mutex);
128 sk_del_node_init_rcu(sk);
129 mutex_unlock(&pfkey_mutex);
130}
131
132static struct proto key_proto = {
133 .name = "KEY",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct pfkey_sock),
136};
137
138static int pfkey_create(struct net *net, struct socket *sock, int protocol,
139 int kern)
140{
141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
142 struct sock *sk;
143 struct pfkey_sock *pfk;
144
145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
146 return -EPERM;
147 if (sock->type != SOCK_RAW)
148 return -ESOCKTNOSUPPORT;
149 if (protocol != PF_KEY_V2)
150 return -EPROTONOSUPPORT;
151
152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
153 if (sk == NULL)
154 return -ENOMEM;
155
156 pfk = pfkey_sk(sk);
157 mutex_init(&pfk->dump_lock);
158
159 sock->ops = &pfkey_ops;
160 sock_init_data(sock, sk);
161
162 sk->sk_family = PF_KEY;
163 sk->sk_destruct = pfkey_sock_destruct;
164
165 atomic_inc(&net_pfkey->socks_nr);
166
167 pfkey_insert(sk);
168
169 return 0;
170}
171
172static int pfkey_release(struct socket *sock)
173{
174 struct sock *sk = sock->sk;
175
176 if (!sk)
177 return 0;
178
179 pfkey_remove(sk);
180
181 sock_orphan(sk);
182 sock->sk = NULL;
183 skb_queue_purge(&sk->sk_write_queue);
184
185 synchronize_rcu();
186 sock_put(sk);
187
188 return 0;
189}
190
191static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
192 struct sock *sk)
193{
194 int err = -ENOBUFS;
195
196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
197 return err;
198
199 skb = skb_clone(skb, allocation);
200
201 if (skb) {
202 skb_set_owner_r(skb, sk);
203 skb_queue_tail(&sk->sk_receive_queue, skb);
204 sk->sk_data_ready(sk);
205 err = 0;
206 }
207 return err;
208}
209
210/* Send SKB to all pfkey sockets matching selected criteria. */
211#define BROADCAST_ALL 0
212#define BROADCAST_ONE 1
213#define BROADCAST_REGISTERED 2
214#define BROADCAST_PROMISC_ONLY 4
215static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
216 int broadcast_flags, struct sock *one_sk,
217 struct net *net)
218{
219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
220 struct sock *sk;
221 int err = -ESRCH;
222
223 /* XXX Do we need something like netlink_overrun? I think
224 * XXX PF_KEY socket apps will not mind current behavior.
225 */
226 if (!skb)
227 return -ENOMEM;
228
229 rcu_read_lock();
230 sk_for_each_rcu(sk, &net_pfkey->table) {
231 struct pfkey_sock *pfk = pfkey_sk(sk);
232 int err2;
233
234 /* Yes, it means that if you are meant to receive this
235 * pfkey message you receive it twice as promiscuous
236 * socket.
237 */
238 if (pfk->promisc)
239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
240
241 /* the exact target will be processed later */
242 if (sk == one_sk)
243 continue;
244 if (broadcast_flags != BROADCAST_ALL) {
245 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
246 continue;
247 if ((broadcast_flags & BROADCAST_REGISTERED) &&
248 !pfk->registered)
249 continue;
250 if (broadcast_flags & BROADCAST_ONE)
251 continue;
252 }
253
254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
255
256 /* Error is cleared after successful sending to at least one
257 * registered KM */
258 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
259 err = err2;
260 }
261 rcu_read_unlock();
262
263 if (one_sk != NULL)
264 err = pfkey_broadcast_one(skb, allocation, one_sk);
265
266 kfree_skb(skb);
267 return err;
268}
269
270static int pfkey_do_dump(struct pfkey_sock *pfk)
271{
272 struct sadb_msg *hdr;
273 int rc;
274
275 mutex_lock(&pfk->dump_lock);
276 if (!pfk->dump.dump) {
277 rc = 0;
278 goto out;
279 }
280
281 rc = pfk->dump.dump(pfk);
282 if (rc == -ENOBUFS) {
283 rc = 0;
284 goto out;
285 }
286
287 if (pfk->dump.skb) {
288 if (!pfkey_can_dump(&pfk->sk)) {
289 rc = 0;
290 goto out;
291 }
292
293 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294 hdr->sadb_msg_seq = 0;
295 hdr->sadb_msg_errno = rc;
296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297 &pfk->sk, sock_net(&pfk->sk));
298 pfk->dump.skb = NULL;
299 }
300
301 pfkey_terminate_dump(pfk);
302
303out:
304 mutex_unlock(&pfk->dump_lock);
305 return rc;
306}
307
308static inline void pfkey_hdr_dup(struct sadb_msg *new,
309 const struct sadb_msg *orig)
310{
311 *new = *orig;
312}
313
314static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
315{
316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
317 struct sadb_msg *hdr;
318
319 if (!skb)
320 return -ENOBUFS;
321
322 /* Woe be to the platform trying to support PFKEY yet
323 * having normal errnos outside the 1-255 range, inclusive.
324 */
325 err = -err;
326 if (err == ERESTARTSYS ||
327 err == ERESTARTNOHAND ||
328 err == ERESTARTNOINTR)
329 err = EINTR;
330 if (err >= 512)
331 err = EINVAL;
332 BUG_ON(err <= 0 || err >= 256);
333
334 hdr = skb_put(skb, sizeof(struct sadb_msg));
335 pfkey_hdr_dup(hdr, orig);
336 hdr->sadb_msg_errno = (uint8_t) err;
337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
338 sizeof(uint64_t));
339
340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
341
342 return 0;
343}
344
345static const u8 sadb_ext_min_len[] = {
346 [SADB_EXT_RESERVED] = (u8) 0,
347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
373};
374
375/* Verify sadb_address_{len,prefixlen} against sa_family. */
376static int verify_address_len(const void *p)
377{
378 const struct sadb_address *sp = p;
379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
380 const struct sockaddr_in *sin;
381#if IS_ENABLED(CONFIG_IPV6)
382 const struct sockaddr_in6 *sin6;
383#endif
384 int len;
385
386 if (sp->sadb_address_len <
387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
388 sizeof(uint64_t)))
389 return -EINVAL;
390
391 switch (addr->sa_family) {
392 case AF_INET:
393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
394 if (sp->sadb_address_len != len ||
395 sp->sadb_address_prefixlen > 32)
396 return -EINVAL;
397 break;
398#if IS_ENABLED(CONFIG_IPV6)
399 case AF_INET6:
400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
401 if (sp->sadb_address_len != len ||
402 sp->sadb_address_prefixlen > 128)
403 return -EINVAL;
404 break;
405#endif
406 default:
407 /* It is user using kernel to keep track of security
408 * associations for another protocol, such as
409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify
410 * lengths.
411 *
412 * XXX Actually, association/policy database is not yet
413 * XXX able to cope with arbitrary sockaddr families.
414 * XXX When it can, remove this -EINVAL. -DaveM
415 */
416 return -EINVAL;
417 }
418
419 return 0;
420}
421
422static inline int sadb_key_len(const struct sadb_key *key)
423{
424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
425
426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
427 sizeof(uint64_t));
428}
429
430static int verify_key_len(const void *p)
431{
432 const struct sadb_key *key = p;
433
434 if (sadb_key_len(key) > key->sadb_key_len)
435 return -EINVAL;
436
437 return 0;
438}
439
440static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
441{
442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
443 sec_ctx->sadb_x_ctx_len,
444 sizeof(uint64_t));
445}
446
447static inline int verify_sec_ctx_len(const void *p)
448{
449 const struct sadb_x_sec_ctx *sec_ctx = p;
450 int len = sec_ctx->sadb_x_ctx_len;
451
452 if (len > PAGE_SIZE)
453 return -EINVAL;
454
455 len = pfkey_sec_ctx_len(sec_ctx);
456
457 if (sec_ctx->sadb_x_sec_len != len)
458 return -EINVAL;
459
460 return 0;
461}
462
463static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
464 gfp_t gfp)
465{
466 struct xfrm_user_sec_ctx *uctx = NULL;
467 int ctx_size = sec_ctx->sadb_x_ctx_len;
468
469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
470
471 if (!uctx)
472 return NULL;
473
474 uctx->len = pfkey_sec_ctx_len(sec_ctx);
475 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
479 memcpy(uctx + 1, sec_ctx + 1,
480 uctx->ctx_len);
481
482 return uctx;
483}
484
485static int present_and_same_family(const struct sadb_address *src,
486 const struct sadb_address *dst)
487{
488 const struct sockaddr *s_addr, *d_addr;
489
490 if (!src || !dst)
491 return 0;
492
493 s_addr = (const struct sockaddr *)(src + 1);
494 d_addr = (const struct sockaddr *)(dst + 1);
495 if (s_addr->sa_family != d_addr->sa_family)
496 return 0;
497 if (s_addr->sa_family != AF_INET
498#if IS_ENABLED(CONFIG_IPV6)
499 && s_addr->sa_family != AF_INET6
500#endif
501 )
502 return 0;
503
504 return 1;
505}
506
507static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
508{
509 const char *p = (char *) hdr;
510 int len = skb->len;
511
512 len -= sizeof(*hdr);
513 p += sizeof(*hdr);
514 while (len > 0) {
515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
516 uint16_t ext_type;
517 int ext_len;
518
519 if (len < sizeof(*ehdr))
520 return -EINVAL;
521
522 ext_len = ehdr->sadb_ext_len;
523 ext_len *= sizeof(uint64_t);
524 ext_type = ehdr->sadb_ext_type;
525 if (ext_len < sizeof(uint64_t) ||
526 ext_len > len ||
527 ext_type == SADB_EXT_RESERVED)
528 return -EINVAL;
529
530 if (ext_type <= SADB_EXT_MAX) {
531 int min = (int) sadb_ext_min_len[ext_type];
532 if (ext_len < min)
533 return -EINVAL;
534 if (ext_hdrs[ext_type-1] != NULL)
535 return -EINVAL;
536 switch (ext_type) {
537 case SADB_EXT_ADDRESS_SRC:
538 case SADB_EXT_ADDRESS_DST:
539 case SADB_EXT_ADDRESS_PROXY:
540 case SADB_X_EXT_NAT_T_OA:
541 if (verify_address_len(p))
542 return -EINVAL;
543 break;
544 case SADB_X_EXT_SEC_CTX:
545 if (verify_sec_ctx_len(p))
546 return -EINVAL;
547 break;
548 case SADB_EXT_KEY_AUTH:
549 case SADB_EXT_KEY_ENCRYPT:
550 if (verify_key_len(p))
551 return -EINVAL;
552 break;
553 default:
554 break;
555 }
556 ext_hdrs[ext_type-1] = (void *) p;
557 }
558 p += ext_len;
559 len -= ext_len;
560 }
561
562 return 0;
563}
564
565static uint16_t
566pfkey_satype2proto(uint8_t satype)
567{
568 switch (satype) {
569 case SADB_SATYPE_UNSPEC:
570 return IPSEC_PROTO_ANY;
571 case SADB_SATYPE_AH:
572 return IPPROTO_AH;
573 case SADB_SATYPE_ESP:
574 return IPPROTO_ESP;
575 case SADB_X_SATYPE_IPCOMP:
576 return IPPROTO_COMP;
577 default:
578 return 0;
579 }
580 /* NOTREACHED */
581}
582
583static uint8_t
584pfkey_proto2satype(uint16_t proto)
585{
586 switch (proto) {
587 case IPPROTO_AH:
588 return SADB_SATYPE_AH;
589 case IPPROTO_ESP:
590 return SADB_SATYPE_ESP;
591 case IPPROTO_COMP:
592 return SADB_X_SATYPE_IPCOMP;
593 default:
594 return 0;
595 }
596 /* NOTREACHED */
597}
598
599/* BTW, this scheme means that there is no way with PFKEY2 sockets to
600 * say specifically 'just raw sockets' as we encode them as 255.
601 */
602
603static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
604{
605 return proto == IPSEC_PROTO_ANY ? 0 : proto;
606}
607
608static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
609{
610 return proto ? proto : IPSEC_PROTO_ANY;
611}
612
613static inline int pfkey_sockaddr_len(sa_family_t family)
614{
615 switch (family) {
616 case AF_INET:
617 return sizeof(struct sockaddr_in);
618#if IS_ENABLED(CONFIG_IPV6)
619 case AF_INET6:
620 return sizeof(struct sockaddr_in6);
621#endif
622 }
623 return 0;
624}
625
626static
627int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
628{
629 switch (sa->sa_family) {
630 case AF_INET:
631 xaddr->a4 =
632 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
633 return AF_INET;
634#if IS_ENABLED(CONFIG_IPV6)
635 case AF_INET6:
636 memcpy(xaddr->a6,
637 &((struct sockaddr_in6 *)sa)->sin6_addr,
638 sizeof(struct in6_addr));
639 return AF_INET6;
640#endif
641 }
642 return 0;
643}
644
645static
646int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
647{
648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
649 xaddr);
650}
651
652static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
653{
654 const struct sadb_sa *sa;
655 const struct sadb_address *addr;
656 uint16_t proto;
657 unsigned short family;
658 xfrm_address_t *xaddr;
659
660 sa = ext_hdrs[SADB_EXT_SA - 1];
661 if (sa == NULL)
662 return NULL;
663
664 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
665 if (proto == 0)
666 return NULL;
667
668 /* sadb_address_len should be checked by caller */
669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
670 if (addr == NULL)
671 return NULL;
672
673 family = ((const struct sockaddr *)(addr + 1))->sa_family;
674 switch (family) {
675 case AF_INET:
676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
677 break;
678#if IS_ENABLED(CONFIG_IPV6)
679 case AF_INET6:
680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
681 break;
682#endif
683 default:
684 xaddr = NULL;
685 }
686
687 if (!xaddr)
688 return NULL;
689
690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
691}
692
693#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
694
695static int
696pfkey_sockaddr_size(sa_family_t family)
697{
698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
699}
700
701static inline int pfkey_mode_from_xfrm(int mode)
702{
703 switch(mode) {
704 case XFRM_MODE_TRANSPORT:
705 return IPSEC_MODE_TRANSPORT;
706 case XFRM_MODE_TUNNEL:
707 return IPSEC_MODE_TUNNEL;
708 case XFRM_MODE_BEET:
709 return IPSEC_MODE_BEET;
710 default:
711 return -1;
712 }
713}
714
715static inline int pfkey_mode_to_xfrm(int mode)
716{
717 switch(mode) {
718 case IPSEC_MODE_ANY: /*XXX*/
719 case IPSEC_MODE_TRANSPORT:
720 return XFRM_MODE_TRANSPORT;
721 case IPSEC_MODE_TUNNEL:
722 return XFRM_MODE_TUNNEL;
723 case IPSEC_MODE_BEET:
724 return XFRM_MODE_BEET;
725 default:
726 return -1;
727 }
728}
729
730static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
731 struct sockaddr *sa,
732 unsigned short family)
733{
734 switch (family) {
735 case AF_INET:
736 {
737 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
738 sin->sin_family = AF_INET;
739 sin->sin_port = port;
740 sin->sin_addr.s_addr = xaddr->a4;
741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
742 return 32;
743 }
744#if IS_ENABLED(CONFIG_IPV6)
745 case AF_INET6:
746 {
747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
748 sin6->sin6_family = AF_INET6;
749 sin6->sin6_port = port;
750 sin6->sin6_flowinfo = 0;
751 sin6->sin6_addr = xaddr->in6;
752 sin6->sin6_scope_id = 0;
753 return 128;
754 }
755#endif
756 }
757 return 0;
758}
759
760static unsigned int pfkey_sockaddr_fill_zero_tail(const xfrm_address_t *xaddr,
761 __be16 port,
762 struct sockaddr *sa,
763 unsigned short family)
764{
765 unsigned int prefixlen;
766 int sockaddr_len = pfkey_sockaddr_len(family);
767 int sockaddr_size = pfkey_sockaddr_size(family);
768
769 prefixlen = pfkey_sockaddr_fill(xaddr, port, sa, family);
770 if (sockaddr_size > sockaddr_len)
771 memset((u8 *)sa + sockaddr_len, 0, sockaddr_size - sockaddr_len);
772
773 return prefixlen;
774}
775
776static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
777 int add_keys, int hsc)
778{
779 struct sk_buff *skb;
780 struct sadb_msg *hdr;
781 struct sadb_sa *sa;
782 struct sadb_lifetime *lifetime;
783 struct sadb_address *addr;
784 struct sadb_key *key;
785 struct sadb_x_sa2 *sa2;
786 struct sadb_x_sec_ctx *sec_ctx;
787 struct xfrm_sec_ctx *xfrm_ctx;
788 int ctx_size = 0;
789 int size;
790 int auth_key_size = 0;
791 int encrypt_key_size = 0;
792 int sockaddr_size;
793 struct xfrm_encap_tmpl *natt = NULL;
794 int mode;
795
796 /* address family check */
797 sockaddr_size = pfkey_sockaddr_size(x->props.family);
798 if (!sockaddr_size)
799 return ERR_PTR(-EINVAL);
800
801 /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
802 key(AE), (identity(SD),) (sensitivity)> */
803 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
804 sizeof(struct sadb_lifetime) +
805 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
806 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
807 sizeof(struct sadb_address)*2 +
808 sockaddr_size*2 +
809 sizeof(struct sadb_x_sa2);
810
811 if ((xfrm_ctx = x->security)) {
812 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
813 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
814 }
815
816 /* identity & sensitivity */
817 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
818 size += sizeof(struct sadb_address) + sockaddr_size;
819
820 if (add_keys) {
821 if (x->aalg && x->aalg->alg_key_len) {
822 auth_key_size =
823 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
824 size += sizeof(struct sadb_key) + auth_key_size;
825 }
826 if (x->ealg && x->ealg->alg_key_len) {
827 encrypt_key_size =
828 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
829 size += sizeof(struct sadb_key) + encrypt_key_size;
830 }
831 }
832 if (x->encap)
833 natt = x->encap;
834
835 if (natt && natt->encap_type) {
836 size += sizeof(struct sadb_x_nat_t_type);
837 size += sizeof(struct sadb_x_nat_t_port);
838 size += sizeof(struct sadb_x_nat_t_port);
839 }
840
841 skb = alloc_skb(size + 16, GFP_ATOMIC);
842 if (skb == NULL)
843 return ERR_PTR(-ENOBUFS);
844
845 /* call should fill header later */
846 hdr = skb_put(skb, sizeof(struct sadb_msg));
847 memset(hdr, 0, size); /* XXX do we need this ? */
848 hdr->sadb_msg_len = size / sizeof(uint64_t);
849
850 /* sa */
851 sa = skb_put(skb, sizeof(struct sadb_sa));
852 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
853 sa->sadb_sa_exttype = SADB_EXT_SA;
854 sa->sadb_sa_spi = x->id.spi;
855 sa->sadb_sa_replay = x->props.replay_window;
856 switch (x->km.state) {
857 case XFRM_STATE_VALID:
858 sa->sadb_sa_state = x->km.dying ?
859 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
860 break;
861 case XFRM_STATE_ACQ:
862 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
863 break;
864 default:
865 sa->sadb_sa_state = SADB_SASTATE_DEAD;
866 break;
867 }
868 sa->sadb_sa_auth = 0;
869 if (x->aalg) {
870 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
871 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
872 a->desc.sadb_alg_id : 0;
873 }
874 sa->sadb_sa_encrypt = 0;
875 BUG_ON(x->ealg && x->calg);
876 if (x->ealg) {
877 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
878 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
879 a->desc.sadb_alg_id : 0;
880 }
881 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
882 if (x->calg) {
883 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
884 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
885 a->desc.sadb_alg_id : 0;
886 }
887
888 sa->sadb_sa_flags = 0;
889 if (x->props.flags & XFRM_STATE_NOECN)
890 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
891 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
892 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
893 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
894 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
895
896 /* hard time */
897 if (hsc & 2) {
898 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
899 lifetime->sadb_lifetime_len =
900 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
901 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
902 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
903 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
904 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
905 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
906 }
907 /* soft time */
908 if (hsc & 1) {
909 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
910 lifetime->sadb_lifetime_len =
911 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
912 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
913 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
914 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
915 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
916 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
917 }
918 /* current time */
919 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
920 lifetime->sadb_lifetime_len =
921 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
922 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
923 lifetime->sadb_lifetime_allocations = x->curlft.packets;
924 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
925 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
926 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
927 /* src address */
928 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
929 addr->sadb_address_len =
930 (sizeof(struct sadb_address)+sockaddr_size)/
931 sizeof(uint64_t);
932 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
933 /* "if the ports are non-zero, then the sadb_address_proto field,
934 normally zero, MUST be filled in with the transport
935 protocol's number." - RFC2367 */
936 addr->sadb_address_proto = 0;
937 addr->sadb_address_reserved = 0;
938
939 addr->sadb_address_prefixlen =
940 pfkey_sockaddr_fill(&x->props.saddr, 0,
941 (struct sockaddr *) (addr + 1),
942 x->props.family);
943 BUG_ON(!addr->sadb_address_prefixlen);
944
945 /* dst address */
946 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
947 addr->sadb_address_len =
948 (sizeof(struct sadb_address)+sockaddr_size)/
949 sizeof(uint64_t);
950 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
951 addr->sadb_address_proto = 0;
952 addr->sadb_address_reserved = 0;
953
954 addr->sadb_address_prefixlen =
955 pfkey_sockaddr_fill(&x->id.daddr, 0,
956 (struct sockaddr *) (addr + 1),
957 x->props.family);
958 BUG_ON(!addr->sadb_address_prefixlen);
959
960 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
961 x->props.family)) {
962 addr = skb_put(skb,
963 sizeof(struct sadb_address) + sockaddr_size);
964 addr->sadb_address_len =
965 (sizeof(struct sadb_address)+sockaddr_size)/
966 sizeof(uint64_t);
967 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
968 addr->sadb_address_proto =
969 pfkey_proto_from_xfrm(x->sel.proto);
970 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
971 addr->sadb_address_reserved = 0;
972
973 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
974 (struct sockaddr *) (addr + 1),
975 x->props.family);
976 }
977
978 /* auth key */
979 if (add_keys && auth_key_size) {
980 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
981 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
982 sizeof(uint64_t);
983 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
984 key->sadb_key_bits = x->aalg->alg_key_len;
985 key->sadb_key_reserved = 0;
986 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
987 }
988 /* encrypt key */
989 if (add_keys && encrypt_key_size) {
990 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
991 key->sadb_key_len = (sizeof(struct sadb_key) +
992 encrypt_key_size) / sizeof(uint64_t);
993 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
994 key->sadb_key_bits = x->ealg->alg_key_len;
995 key->sadb_key_reserved = 0;
996 memcpy(key + 1, x->ealg->alg_key,
997 (x->ealg->alg_key_len+7)/8);
998 }
999
1000 /* sa */
1001 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
1002 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1003 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1004 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1005 kfree_skb(skb);
1006 return ERR_PTR(-EINVAL);
1007 }
1008 sa2->sadb_x_sa2_mode = mode;
1009 sa2->sadb_x_sa2_reserved1 = 0;
1010 sa2->sadb_x_sa2_reserved2 = 0;
1011 sa2->sadb_x_sa2_sequence = 0;
1012 sa2->sadb_x_sa2_reqid = x->props.reqid;
1013
1014 if (natt && natt->encap_type) {
1015 struct sadb_x_nat_t_type *n_type;
1016 struct sadb_x_nat_t_port *n_port;
1017
1018 /* type */
1019 n_type = skb_put(skb, sizeof(*n_type));
1020 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1021 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1022 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1023 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1024 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1025 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1026
1027 /* source port */
1028 n_port = skb_put(skb, sizeof(*n_port));
1029 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1030 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1031 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1032 n_port->sadb_x_nat_t_port_reserved = 0;
1033
1034 /* dest port */
1035 n_port = skb_put(skb, sizeof(*n_port));
1036 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1037 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1038 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1039 n_port->sadb_x_nat_t_port_reserved = 0;
1040 }
1041
1042 /* security context */
1043 if (xfrm_ctx) {
1044 sec_ctx = skb_put(skb,
1045 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1046 sec_ctx->sadb_x_sec_len =
1047 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1048 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1049 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1050 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1051 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1052 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1053 xfrm_ctx->ctx_len);
1054 }
1055
1056 return skb;
1057}
1058
1059
1060static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1061{
1062 struct sk_buff *skb;
1063
1064 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1065
1066 return skb;
1067}
1068
1069static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1070 int hsc)
1071{
1072 return __pfkey_xfrm_state2msg(x, 0, hsc);
1073}
1074
1075static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1076 const struct sadb_msg *hdr,
1077 void * const *ext_hdrs)
1078{
1079 struct xfrm_state *x;
1080 const struct sadb_lifetime *lifetime;
1081 const struct sadb_sa *sa;
1082 const struct sadb_key *key;
1083 const struct sadb_x_sec_ctx *sec_ctx;
1084 uint16_t proto;
1085 int err;
1086
1087
1088 sa = ext_hdrs[SADB_EXT_SA - 1];
1089 if (!sa ||
1090 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1091 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1092 return ERR_PTR(-EINVAL);
1093 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1094 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1095 return ERR_PTR(-EINVAL);
1096 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1097 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1098 return ERR_PTR(-EINVAL);
1099 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1100 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1101 return ERR_PTR(-EINVAL);
1102
1103 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1104 if (proto == 0)
1105 return ERR_PTR(-EINVAL);
1106
1107 /* default error is no buffer space */
1108 err = -ENOBUFS;
1109
1110 /* RFC2367:
1111
1112 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1113 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1114 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1115 Therefore, the sadb_sa_state field of all submitted SAs MUST be
1116 SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1117 not true.
1118
1119 However, KAME setkey always uses SADB_SASTATE_LARVAL.
1120 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1121 */
1122 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1123 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1124 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1125 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1126 return ERR_PTR(-EINVAL);
1127 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1128 if (key != NULL &&
1129 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1130 key->sadb_key_bits == 0)
1131 return ERR_PTR(-EINVAL);
1132 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1133 if (key != NULL &&
1134 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1135 key->sadb_key_bits == 0)
1136 return ERR_PTR(-EINVAL);
1137
1138 x = xfrm_state_alloc(net);
1139 if (x == NULL)
1140 return ERR_PTR(-ENOBUFS);
1141
1142 x->id.proto = proto;
1143 x->id.spi = sa->sadb_sa_spi;
1144 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1145 (sizeof(x->replay.bitmap) * 8));
1146 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1147 x->props.flags |= XFRM_STATE_NOECN;
1148 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1149 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1150 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1151 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1152
1153 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1154 if (lifetime != NULL) {
1155 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1156 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1157 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1158 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1159 }
1160 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1161 if (lifetime != NULL) {
1162 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1163 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1164 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1165 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1166 }
1167
1168 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1169 if (sec_ctx != NULL) {
1170 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1171
1172 if (!uctx)
1173 goto out;
1174
1175 err = security_xfrm_state_alloc(x, uctx);
1176 kfree(uctx);
1177
1178 if (err)
1179 goto out;
1180 }
1181
1182 err = -ENOBUFS;
1183 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1184 if (sa->sadb_sa_auth) {
1185 int keysize = 0;
1186 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1187 if (!a || !a->pfkey_supported) {
1188 err = -ENOSYS;
1189 goto out;
1190 }
1191 if (key)
1192 keysize = (key->sadb_key_bits + 7) / 8;
1193 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1194 if (!x->aalg) {
1195 err = -ENOMEM;
1196 goto out;
1197 }
1198 strcpy(x->aalg->alg_name, a->name);
1199 x->aalg->alg_key_len = 0;
1200 if (key) {
1201 x->aalg->alg_key_len = key->sadb_key_bits;
1202 memcpy(x->aalg->alg_key, key+1, keysize);
1203 }
1204 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1205 x->props.aalgo = sa->sadb_sa_auth;
1206 /* x->algo.flags = sa->sadb_sa_flags; */
1207 }
1208 if (sa->sadb_sa_encrypt) {
1209 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1210 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1211 if (!a || !a->pfkey_supported) {
1212 err = -ENOSYS;
1213 goto out;
1214 }
1215 x->calg = kmalloc_obj(*x->calg);
1216 if (!x->calg) {
1217 err = -ENOMEM;
1218 goto out;
1219 }
1220 strcpy(x->calg->alg_name, a->name);
1221 x->calg->alg_key_len = 0;
1222 x->props.calgo = sa->sadb_sa_encrypt;
1223 } else {
1224 int keysize = 0;
1225 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1226 if (!a || !a->pfkey_supported) {
1227 err = -ENOSYS;
1228 goto out;
1229 }
1230 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1231 if (key)
1232 keysize = (key->sadb_key_bits + 7) / 8;
1233 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1234 if (!x->ealg) {
1235 err = -ENOMEM;
1236 goto out;
1237 }
1238 strcpy(x->ealg->alg_name, a->name);
1239 x->ealg->alg_key_len = 0;
1240 if (key) {
1241 x->ealg->alg_key_len = key->sadb_key_bits;
1242 memcpy(x->ealg->alg_key, key+1, keysize);
1243 }
1244 x->props.ealgo = sa->sadb_sa_encrypt;
1245 x->geniv = a->uinfo.encr.geniv;
1246 }
1247 }
1248 /* x->algo.flags = sa->sadb_sa_flags; */
1249
1250 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1251 &x->props.saddr);
1252 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1253 &x->id.daddr);
1254
1255 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1256 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1257 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1258 if (mode < 0) {
1259 err = -EINVAL;
1260 goto out;
1261 }
1262 x->props.mode = mode;
1263 x->props.reqid = sa2->sadb_x_sa2_reqid;
1264 }
1265
1266 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1267 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1268
1269 /* Nobody uses this, but we try. */
1270 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1271 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1272 }
1273
1274 if (!x->sel.family)
1275 x->sel.family = x->props.family;
1276
1277 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1278 const struct sadb_x_nat_t_type* n_type;
1279 struct xfrm_encap_tmpl *natt;
1280
1281 x->encap = kzalloc_obj(*x->encap);
1282 if (!x->encap) {
1283 err = -ENOMEM;
1284 goto out;
1285 }
1286
1287 natt = x->encap;
1288 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1289 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1290
1291 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1292 const struct sadb_x_nat_t_port *n_port =
1293 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1294 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1295 }
1296 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1297 const struct sadb_x_nat_t_port *n_port =
1298 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1299 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1300 }
1301 }
1302
1303 err = xfrm_init_state(x, NULL);
1304 if (err)
1305 goto out;
1306
1307 x->km.seq = hdr->sadb_msg_seq;
1308 return x;
1309
1310out:
1311 x->km.state = XFRM_STATE_DEAD;
1312 xfrm_state_put(x);
1313 return ERR_PTR(err);
1314}
1315
1316static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1317{
1318 return -EOPNOTSUPP;
1319}
1320
1321static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1322{
1323 struct net *net = sock_net(sk);
1324 struct sk_buff *resp_skb;
1325 struct sadb_x_sa2 *sa2;
1326 struct sadb_address *saddr, *daddr;
1327 struct sadb_msg *out_hdr;
1328 struct sadb_spirange *range;
1329 struct xfrm_state *x = NULL;
1330 int mode;
1331 int err;
1332 u32 min_spi, max_spi;
1333 u32 reqid;
1334 u8 proto;
1335 unsigned short family;
1336 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1337
1338 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1339 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1340 return -EINVAL;
1341
1342 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1343 if (proto == 0)
1344 return -EINVAL;
1345
1346 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1347 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1348 if (mode < 0)
1349 return -EINVAL;
1350 reqid = sa2->sadb_x_sa2_reqid;
1351 } else {
1352 mode = 0;
1353 reqid = 0;
1354 }
1355
1356 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1357 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1358
1359 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1360 switch (family) {
1361 case AF_INET:
1362 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1363 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1364 break;
1365#if IS_ENABLED(CONFIG_IPV6)
1366 case AF_INET6:
1367 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1368 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1369 break;
1370#endif
1371 }
1372
1373 if (hdr->sadb_msg_seq) {
1374 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
1375 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1376 xfrm_state_put(x);
1377 x = NULL;
1378 }
1379 }
1380
1381 if (!x)
1382 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, UINT_MAX,
1383 proto, xdaddr, xsaddr, 1, family);
1384
1385 if (x == NULL)
1386 return -ENOENT;
1387
1388 min_spi = 0x100;
1389 max_spi = 0x0fffffff;
1390
1391 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1392 if (range) {
1393 min_spi = range->sadb_spirange_min;
1394 max_spi = range->sadb_spirange_max;
1395 }
1396
1397 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL);
1398 if (err) {
1399 xfrm_state_put(x);
1400 return err;
1401 }
1402
1403 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL);
1404 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1405
1406 if (IS_ERR(resp_skb)) {
1407 xfrm_state_put(x);
1408 return PTR_ERR(resp_skb);
1409 }
1410
1411 out_hdr = (struct sadb_msg *) resp_skb->data;
1412 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1413 out_hdr->sadb_msg_type = SADB_GETSPI;
1414 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1415 out_hdr->sadb_msg_errno = 0;
1416 out_hdr->sadb_msg_reserved = 0;
1417 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1418 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1419
1420 xfrm_state_put(x);
1421
1422 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1423
1424 return 0;
1425}
1426
1427static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1428{
1429 struct net *net = sock_net(sk);
1430 struct xfrm_state *x;
1431
1432 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1433 return -EOPNOTSUPP;
1434
1435 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1436 return 0;
1437
1438 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX);
1439 if (x == NULL)
1440 return 0;
1441
1442 spin_lock_bh(&x->lock);
1443 if (x->km.state == XFRM_STATE_ACQ)
1444 x->km.state = XFRM_STATE_ERROR;
1445
1446 spin_unlock_bh(&x->lock);
1447 xfrm_state_put(x);
1448 return 0;
1449}
1450
1451static inline int event2poltype(int event)
1452{
1453 switch (event) {
1454 case XFRM_MSG_DELPOLICY:
1455 return SADB_X_SPDDELETE;
1456 case XFRM_MSG_NEWPOLICY:
1457 return SADB_X_SPDADD;
1458 case XFRM_MSG_UPDPOLICY:
1459 return SADB_X_SPDUPDATE;
1460 case XFRM_MSG_POLEXPIRE:
1461 // return SADB_X_SPDEXPIRE;
1462 default:
1463 pr_err("pfkey: Unknown policy event %d\n", event);
1464 break;
1465 }
1466
1467 return 0;
1468}
1469
1470static inline int event2keytype(int event)
1471{
1472 switch (event) {
1473 case XFRM_MSG_DELSA:
1474 return SADB_DELETE;
1475 case XFRM_MSG_NEWSA:
1476 return SADB_ADD;
1477 case XFRM_MSG_UPDSA:
1478 return SADB_UPDATE;
1479 case XFRM_MSG_EXPIRE:
1480 return SADB_EXPIRE;
1481 default:
1482 pr_err("pfkey: Unknown SA event %d\n", event);
1483 break;
1484 }
1485
1486 return 0;
1487}
1488
1489/* ADD/UPD/DEL */
1490static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1491{
1492 struct sk_buff *skb;
1493 struct sadb_msg *hdr;
1494
1495 skb = pfkey_xfrm_state2msg(x);
1496
1497 if (IS_ERR(skb))
1498 return PTR_ERR(skb);
1499
1500 hdr = (struct sadb_msg *) skb->data;
1501 hdr->sadb_msg_version = PF_KEY_V2;
1502 hdr->sadb_msg_type = event2keytype(c->event);
1503 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1504 hdr->sadb_msg_errno = 0;
1505 hdr->sadb_msg_reserved = 0;
1506 hdr->sadb_msg_seq = c->seq;
1507 hdr->sadb_msg_pid = c->portid;
1508
1509 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1510
1511 return 0;
1512}
1513
1514static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1515{
1516 struct net *net = sock_net(sk);
1517 struct xfrm_state *x;
1518 int err;
1519 struct km_event c;
1520
1521 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1522 if (IS_ERR(x))
1523 return PTR_ERR(x);
1524
1525 xfrm_state_hold(x);
1526 if (hdr->sadb_msg_type == SADB_ADD)
1527 err = xfrm_state_add(x);
1528 else
1529 err = xfrm_state_update(x);
1530
1531 xfrm_audit_state_add(x, err ? 0 : 1, true);
1532
1533 if (err < 0) {
1534 x->km.state = XFRM_STATE_DEAD;
1535 __xfrm_state_put(x);
1536 goto out;
1537 }
1538
1539 if (hdr->sadb_msg_type == SADB_ADD)
1540 c.event = XFRM_MSG_NEWSA;
1541 else
1542 c.event = XFRM_MSG_UPDSA;
1543 c.seq = hdr->sadb_msg_seq;
1544 c.portid = hdr->sadb_msg_pid;
1545 km_state_notify(x, &c);
1546out:
1547 xfrm_state_put(x);
1548 return err;
1549}
1550
1551static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1552{
1553 struct net *net = sock_net(sk);
1554 struct xfrm_state *x;
1555 struct km_event c;
1556 int err;
1557
1558 if (!ext_hdrs[SADB_EXT_SA-1] ||
1559 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1560 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1561 return -EINVAL;
1562
1563 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1564 if (x == NULL)
1565 return -ESRCH;
1566
1567 if ((err = security_xfrm_state_delete(x)))
1568 goto out;
1569
1570 if (xfrm_state_kern(x)) {
1571 err = -EPERM;
1572 goto out;
1573 }
1574
1575 err = xfrm_state_delete(x);
1576
1577 if (err < 0)
1578 goto out;
1579
1580 c.seq = hdr->sadb_msg_seq;
1581 c.portid = hdr->sadb_msg_pid;
1582 c.event = XFRM_MSG_DELSA;
1583 km_state_notify(x, &c);
1584out:
1585 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1586 xfrm_state_put(x);
1587
1588 return err;
1589}
1590
1591static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1592{
1593 struct net *net = sock_net(sk);
1594 __u8 proto;
1595 struct sk_buff *out_skb;
1596 struct sadb_msg *out_hdr;
1597 struct xfrm_state *x;
1598
1599 if (!ext_hdrs[SADB_EXT_SA-1] ||
1600 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1601 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1602 return -EINVAL;
1603
1604 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1605 if (x == NULL)
1606 return -ESRCH;
1607
1608 out_skb = pfkey_xfrm_state2msg(x);
1609 proto = x->id.proto;
1610 xfrm_state_put(x);
1611 if (IS_ERR(out_skb))
1612 return PTR_ERR(out_skb);
1613
1614 out_hdr = (struct sadb_msg *) out_skb->data;
1615 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1616 out_hdr->sadb_msg_type = SADB_GET;
1617 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1618 out_hdr->sadb_msg_errno = 0;
1619 out_hdr->sadb_msg_reserved = 0;
1620 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1621 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1622 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1623
1624 return 0;
1625}
1626
1627static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1628 gfp_t allocation)
1629{
1630 struct sk_buff *skb;
1631 struct sadb_msg *hdr;
1632 int len, auth_len, enc_len, i;
1633
1634 auth_len = xfrm_count_pfkey_auth_supported();
1635 if (auth_len) {
1636 auth_len *= sizeof(struct sadb_alg);
1637 auth_len += sizeof(struct sadb_supported);
1638 }
1639
1640 enc_len = xfrm_count_pfkey_enc_supported();
1641 if (enc_len) {
1642 enc_len *= sizeof(struct sadb_alg);
1643 enc_len += sizeof(struct sadb_supported);
1644 }
1645
1646 len = enc_len + auth_len + sizeof(struct sadb_msg);
1647
1648 skb = alloc_skb(len + 16, allocation);
1649 if (!skb)
1650 goto out_put_algs;
1651
1652 hdr = skb_put(skb, sizeof(*hdr));
1653 pfkey_hdr_dup(hdr, orig);
1654 hdr->sadb_msg_errno = 0;
1655 hdr->sadb_msg_len = len / sizeof(uint64_t);
1656
1657 if (auth_len) {
1658 struct sadb_supported *sp;
1659 struct sadb_alg *ap;
1660
1661 sp = skb_put(skb, auth_len);
1662 ap = (struct sadb_alg *) (sp + 1);
1663
1664 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1665 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1666
1667 for (i = 0; ; i++) {
1668 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1669 if (!aalg)
1670 break;
1671 if (!aalg->pfkey_supported)
1672 continue;
1673 if (aalg->available)
1674 *ap++ = aalg->desc;
1675 }
1676 }
1677
1678 if (enc_len) {
1679 struct sadb_supported *sp;
1680 struct sadb_alg *ap;
1681
1682 sp = skb_put(skb, enc_len);
1683 ap = (struct sadb_alg *) (sp + 1);
1684
1685 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1686 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1687
1688 for (i = 0; ; i++) {
1689 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1690 if (!ealg)
1691 break;
1692 if (!ealg->pfkey_supported)
1693 continue;
1694 if (ealg->available)
1695 *ap++ = ealg->desc;
1696 }
1697 }
1698
1699out_put_algs:
1700 return skb;
1701}
1702
1703static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1704{
1705 struct pfkey_sock *pfk = pfkey_sk(sk);
1706 struct sk_buff *supp_skb;
1707
1708 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1709 return -EINVAL;
1710
1711 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1712 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1713 return -EEXIST;
1714 pfk->registered |= (1<<hdr->sadb_msg_satype);
1715 }
1716
1717 mutex_lock(&pfkey_mutex);
1718 xfrm_probe_algs();
1719
1720 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1721 mutex_unlock(&pfkey_mutex);
1722
1723 if (!supp_skb) {
1724 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1725 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1726
1727 return -ENOBUFS;
1728 }
1729
1730 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1731 sock_net(sk));
1732 return 0;
1733}
1734
1735static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1736{
1737 struct sk_buff *skb;
1738 struct sadb_msg *hdr;
1739
1740 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1741 if (!skb)
1742 return -ENOBUFS;
1743
1744 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1745 hdr->sadb_msg_errno = (uint8_t) 0;
1746 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1747
1748 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1749 sock_net(sk));
1750}
1751
1752static int key_notify_sa_flush(const struct km_event *c)
1753{
1754 struct sk_buff *skb;
1755 struct sadb_msg *hdr;
1756
1757 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1758 if (!skb)
1759 return -ENOBUFS;
1760 hdr = skb_put(skb, sizeof(struct sadb_msg));
1761 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1762 hdr->sadb_msg_type = SADB_FLUSH;
1763 hdr->sadb_msg_seq = c->seq;
1764 hdr->sadb_msg_pid = c->portid;
1765 hdr->sadb_msg_version = PF_KEY_V2;
1766 hdr->sadb_msg_errno = (uint8_t) 0;
1767 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1768 hdr->sadb_msg_reserved = 0;
1769
1770 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1771
1772 return 0;
1773}
1774
1775static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1776{
1777 struct net *net = sock_net(sk);
1778 unsigned int proto;
1779 struct km_event c;
1780 int err, err2;
1781
1782 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1783 if (proto == 0)
1784 return -EINVAL;
1785
1786 err = xfrm_state_flush(net, proto, true);
1787 err2 = unicast_flush_resp(sk, hdr);
1788 if (err || err2) {
1789 if (err == -ESRCH) /* empty table - go quietly */
1790 err = 0;
1791 return err ? err : err2;
1792 }
1793
1794 c.data.proto = proto;
1795 c.seq = hdr->sadb_msg_seq;
1796 c.portid = hdr->sadb_msg_pid;
1797 c.event = XFRM_MSG_FLUSHSA;
1798 c.net = net;
1799 km_state_notify(NULL, &c);
1800
1801 return 0;
1802}
1803
1804static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1805{
1806 struct pfkey_sock *pfk = ptr;
1807 struct sk_buff *out_skb;
1808 struct sadb_msg *out_hdr;
1809
1810 if (!pfkey_can_dump(&pfk->sk))
1811 return -ENOBUFS;
1812
1813 out_skb = pfkey_xfrm_state2msg(x);
1814 if (IS_ERR(out_skb))
1815 return PTR_ERR(out_skb);
1816
1817 out_hdr = (struct sadb_msg *) out_skb->data;
1818 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1819 out_hdr->sadb_msg_type = SADB_DUMP;
1820 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1821 out_hdr->sadb_msg_errno = 0;
1822 out_hdr->sadb_msg_reserved = 0;
1823 out_hdr->sadb_msg_seq = count + 1;
1824 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1825
1826 if (pfk->dump.skb)
1827 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1828 &pfk->sk, sock_net(&pfk->sk));
1829 pfk->dump.skb = out_skb;
1830
1831 return 0;
1832}
1833
1834static int pfkey_dump_sa(struct pfkey_sock *pfk)
1835{
1836 struct net *net = sock_net(&pfk->sk);
1837 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1838}
1839
1840static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1841{
1842 struct net *net = sock_net(&pfk->sk);
1843
1844 xfrm_state_walk_done(&pfk->dump.u.state, net);
1845}
1846
1847static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1848{
1849 u8 proto;
1850 struct xfrm_address_filter *filter = NULL;
1851 struct pfkey_sock *pfk = pfkey_sk(sk);
1852
1853 mutex_lock(&pfk->dump_lock);
1854 if (pfk->dump.dump != NULL) {
1855 mutex_unlock(&pfk->dump_lock);
1856 return -EBUSY;
1857 }
1858
1859 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1860 if (proto == 0) {
1861 mutex_unlock(&pfk->dump_lock);
1862 return -EINVAL;
1863 }
1864
1865 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1866 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1867
1868 if ((xfilter->sadb_x_filter_splen >
1869 (sizeof(xfrm_address_t) << 3)) ||
1870 (xfilter->sadb_x_filter_dplen >
1871 (sizeof(xfrm_address_t) << 3))) {
1872 mutex_unlock(&pfk->dump_lock);
1873 return -EINVAL;
1874 }
1875 filter = kmalloc_obj(*filter);
1876 if (filter == NULL) {
1877 mutex_unlock(&pfk->dump_lock);
1878 return -ENOMEM;
1879 }
1880
1881 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1882 sizeof(xfrm_address_t));
1883 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1884 sizeof(xfrm_address_t));
1885 filter->family = xfilter->sadb_x_filter_family;
1886 filter->splen = xfilter->sadb_x_filter_splen;
1887 filter->dplen = xfilter->sadb_x_filter_dplen;
1888 }
1889
1890 pfk->dump.msg_version = hdr->sadb_msg_version;
1891 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1892 pfk->dump.dump = pfkey_dump_sa;
1893 pfk->dump.done = pfkey_dump_sa_done;
1894 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1895 mutex_unlock(&pfk->dump_lock);
1896
1897 return pfkey_do_dump(pfk);
1898}
1899
1900static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1901{
1902 struct pfkey_sock *pfk = pfkey_sk(sk);
1903 int satype = hdr->sadb_msg_satype;
1904 bool reset_errno = false;
1905
1906 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1907 reset_errno = true;
1908 if (satype != 0 && satype != 1)
1909 return -EINVAL;
1910 pfk->promisc = satype;
1911 }
1912 if (reset_errno && skb_cloned(skb))
1913 skb = skb_copy(skb, GFP_KERNEL);
1914 else
1915 skb = skb_clone(skb, GFP_KERNEL);
1916
1917 if (reset_errno && skb) {
1918 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1919 new_hdr->sadb_msg_errno = 0;
1920 }
1921
1922 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1923 return 0;
1924}
1925
1926static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1927{
1928 int i;
1929 u32 reqid = *(u32*)ptr;
1930
1931 for (i=0; i<xp->xfrm_nr; i++) {
1932 if (xp->xfrm_vec[i].reqid == reqid)
1933 return -EEXIST;
1934 }
1935 return 0;
1936}
1937
1938static u32 gen_reqid(struct net *net)
1939{
1940 struct xfrm_policy_walk walk;
1941 u32 start;
1942 int rc;
1943 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1944
1945 start = reqid;
1946 do {
1947 ++reqid;
1948 if (reqid == 0)
1949 reqid = IPSEC_MANUAL_REQID_MAX+1;
1950 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1951 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1952 xfrm_policy_walk_done(&walk, net);
1953 if (rc != -EEXIST)
1954 return reqid;
1955 } while (reqid != start);
1956 return 0;
1957}
1958
1959static int
1960parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol,
1961 struct sadb_x_ipsecrequest *rq)
1962{
1963 struct net *net = xp_net(xp);
1964 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1965 int mode;
1966
1967 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1968 return -ELOOP;
1969
1970 if (rq->sadb_x_ipsecrequest_mode == 0)
1971 return -EINVAL;
1972 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1973 return -EINVAL;
1974
1975 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1976 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1977 return -EINVAL;
1978 t->mode = mode;
1979 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) {
1980 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) &&
1981 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND)
1982 return -EINVAL;
1983 t->optional = 1;
1984 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1985 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1986 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1987 t->reqid = 0;
1988 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1989 return -ENOBUFS;
1990 }
1991
1992 /* addresses present only in tunnel mode */
1993 if (t->mode == XFRM_MODE_TUNNEL) {
1994 int err;
1995
1996 err = parse_sockaddr_pair(
1997 (struct sockaddr *)(rq + 1),
1998 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1999 &t->saddr, &t->id.daddr, &t->encap_family);
2000 if (err)
2001 return err;
2002 } else
2003 t->encap_family = xp->family;
2004
2005 /* No way to set this via kame pfkey */
2006 t->allalgs = 1;
2007 xp->xfrm_nr++;
2008 return 0;
2009}
2010
2011static int
2012parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2013{
2014 int err;
2015 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2016 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2017
2018 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2019 return -EINVAL;
2020
2021 while (len >= sizeof(*rq)) {
2022 if (len < rq->sadb_x_ipsecrequest_len ||
2023 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2024 return -EINVAL;
2025
2026 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0)
2027 return err;
2028 len -= rq->sadb_x_ipsecrequest_len;
2029 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2030 }
2031 return 0;
2032}
2033
2034static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2035{
2036 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2037
2038 if (xfrm_ctx) {
2039 int len = sizeof(struct sadb_x_sec_ctx);
2040 len += xfrm_ctx->ctx_len;
2041 return PFKEY_ALIGN8(len);
2042 }
2043 return 0;
2044}
2045
2046static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2047{
2048 const struct xfrm_tmpl *t;
2049 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2050 int socklen = 0;
2051 int i;
2052
2053 for (i=0; i<xp->xfrm_nr; i++) {
2054 t = xp->xfrm_vec + i;
2055 socklen += pfkey_sockaddr_len(t->encap_family);
2056 }
2057
2058 return sizeof(struct sadb_msg) +
2059 (sizeof(struct sadb_lifetime) * 3) +
2060 (sizeof(struct sadb_address) * 2) +
2061 (sockaddr_size * 2) +
2062 sizeof(struct sadb_x_policy) +
2063 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2064 (socklen * 2) +
2065 pfkey_xfrm_policy2sec_ctx_size(xp);
2066}
2067
2068static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2069{
2070 struct sk_buff *skb;
2071 int size;
2072
2073 size = pfkey_xfrm_policy2msg_size(xp);
2074
2075 skb = alloc_skb(size + 16, GFP_ATOMIC);
2076 if (skb == NULL)
2077 return ERR_PTR(-ENOBUFS);
2078
2079 return skb;
2080}
2081
2082static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2083{
2084 struct sadb_msg *hdr;
2085 struct sadb_address *addr;
2086 struct sadb_lifetime *lifetime;
2087 struct sadb_x_policy *pol;
2088 struct sadb_x_sec_ctx *sec_ctx;
2089 struct xfrm_sec_ctx *xfrm_ctx;
2090 int i;
2091 int size;
2092 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2093 int socklen = pfkey_sockaddr_len(xp->family);
2094
2095 size = pfkey_xfrm_policy2msg_size(xp);
2096
2097 /* call should fill header later */
2098 hdr = skb_put(skb, sizeof(struct sadb_msg));
2099 memset(hdr, 0, size); /* XXX do we need this ? */
2100
2101 /* src address */
2102 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2103 addr->sadb_address_len =
2104 (sizeof(struct sadb_address)+sockaddr_size)/
2105 sizeof(uint64_t);
2106 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2107 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2108 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2109 addr->sadb_address_reserved = 0;
2110 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2111 xp->selector.sport,
2112 (struct sockaddr *) (addr + 1),
2113 xp->family))
2114 BUG();
2115
2116 /* dst address */
2117 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2118 addr->sadb_address_len =
2119 (sizeof(struct sadb_address)+sockaddr_size)/
2120 sizeof(uint64_t);
2121 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2122 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2123 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2124 addr->sadb_address_reserved = 0;
2125
2126 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2127 (struct sockaddr *) (addr + 1),
2128 xp->family);
2129
2130 /* hard time */
2131 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2132 lifetime->sadb_lifetime_len =
2133 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2134 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2135 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2136 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2137 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2138 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2139 /* soft time */
2140 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2141 lifetime->sadb_lifetime_len =
2142 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2143 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2144 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2145 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2146 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2147 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2148 /* current time */
2149 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2150 lifetime->sadb_lifetime_len =
2151 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2152 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2153 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2154 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2155 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2156 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2157
2158 pol = skb_put(skb, sizeof(struct sadb_x_policy));
2159 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2160 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2161 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2162 if (xp->action == XFRM_POLICY_ALLOW) {
2163 if (xp->xfrm_nr)
2164 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2165 else
2166 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2167 }
2168 pol->sadb_x_policy_dir = dir+1;
2169 pol->sadb_x_policy_reserved = 0;
2170 pol->sadb_x_policy_id = xp->index;
2171 pol->sadb_x_policy_priority = xp->priority;
2172
2173 for (i=0; i<xp->xfrm_nr; i++) {
2174 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2175 struct sadb_x_ipsecrequest *rq;
2176 int req_size;
2177 int mode;
2178
2179 req_size = sizeof(struct sadb_x_ipsecrequest);
2180 if (t->mode == XFRM_MODE_TUNNEL) {
2181 socklen = pfkey_sockaddr_len(t->encap_family);
2182 req_size += socklen * 2;
2183 } else {
2184 size -= 2*socklen;
2185 }
2186 rq = skb_put(skb, req_size);
2187 pol->sadb_x_policy_len += req_size/8;
2188 memset(rq, 0, sizeof(*rq));
2189 rq->sadb_x_ipsecrequest_len = req_size;
2190 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2191 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2192 return -EINVAL;
2193 rq->sadb_x_ipsecrequest_mode = mode;
2194 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2195 if (t->reqid)
2196 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2197 if (t->optional)
2198 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2199 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2200
2201 if (t->mode == XFRM_MODE_TUNNEL) {
2202 u8 *sa = (void *)(rq + 1);
2203 pfkey_sockaddr_fill(&t->saddr, 0,
2204 (struct sockaddr *)sa,
2205 t->encap_family);
2206 pfkey_sockaddr_fill(&t->id.daddr, 0,
2207 (struct sockaddr *) (sa + socklen),
2208 t->encap_family);
2209 }
2210 }
2211
2212 /* security context */
2213 if ((xfrm_ctx = xp->security)) {
2214 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2215
2216 sec_ctx = skb_put(skb, ctx_size);
2217 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2218 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2219 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2220 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2221 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2222 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2223 xfrm_ctx->ctx_len);
2224 }
2225
2226 hdr->sadb_msg_len = size / sizeof(uint64_t);
2227 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2228
2229 return 0;
2230}
2231
2232static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2233{
2234 struct sk_buff *out_skb;
2235 struct sadb_msg *out_hdr;
2236 int err;
2237
2238 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2239 if (IS_ERR(out_skb))
2240 return PTR_ERR(out_skb);
2241
2242 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2243 if (err < 0) {
2244 kfree_skb(out_skb);
2245 return err;
2246 }
2247
2248 out_hdr = (struct sadb_msg *) out_skb->data;
2249 out_hdr->sadb_msg_version = PF_KEY_V2;
2250
2251 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2252 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2253 else
2254 out_hdr->sadb_msg_type = event2poltype(c->event);
2255 out_hdr->sadb_msg_errno = 0;
2256 out_hdr->sadb_msg_seq = c->seq;
2257 out_hdr->sadb_msg_pid = c->portid;
2258 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2259 return 0;
2260
2261}
2262
2263static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2264{
2265 struct net *net = sock_net(sk);
2266 int err = 0;
2267 struct sadb_lifetime *lifetime;
2268 struct sadb_address *sa;
2269 struct sadb_x_policy *pol;
2270 struct xfrm_policy *xp;
2271 struct km_event c;
2272 struct sadb_x_sec_ctx *sec_ctx;
2273
2274 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2275 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2276 !ext_hdrs[SADB_X_EXT_POLICY-1])
2277 return -EINVAL;
2278
2279 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2280 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2281 return -EINVAL;
2282 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2283 return -EINVAL;
2284
2285 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2286 if (xp == NULL)
2287 return -ENOBUFS;
2288
2289 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2290 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2291 xp->priority = pol->sadb_x_policy_priority;
2292
2293 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2294 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2295 xp->selector.family = xp->family;
2296 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2297 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2298 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2299 if (xp->selector.sport)
2300 xp->selector.sport_mask = htons(0xffff);
2301
2302 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2303 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2304 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2305
2306 /* Amusing, we set this twice. KAME apps appear to set same value
2307 * in both addresses.
2308 */
2309 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2310
2311 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2312 if (xp->selector.dport)
2313 xp->selector.dport_mask = htons(0xffff);
2314
2315 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2316 if (sec_ctx != NULL) {
2317 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2318
2319 if (!uctx) {
2320 err = -ENOBUFS;
2321 goto out;
2322 }
2323
2324 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2325 kfree(uctx);
2326
2327 if (err)
2328 goto out;
2329 }
2330
2331 xp->lft.soft_byte_limit = XFRM_INF;
2332 xp->lft.hard_byte_limit = XFRM_INF;
2333 xp->lft.soft_packet_limit = XFRM_INF;
2334 xp->lft.hard_packet_limit = XFRM_INF;
2335 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2336 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2337 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2338 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2339 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2340 }
2341 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2342 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2343 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2344 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2345 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2346 }
2347 xp->xfrm_nr = 0;
2348 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2349 (err = parse_ipsecrequests(xp, pol)) < 0)
2350 goto out;
2351
2352 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2353 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2354
2355 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2356
2357 if (err)
2358 goto out;
2359
2360 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2361 c.event = XFRM_MSG_UPDPOLICY;
2362 else
2363 c.event = XFRM_MSG_NEWPOLICY;
2364
2365 c.seq = hdr->sadb_msg_seq;
2366 c.portid = hdr->sadb_msg_pid;
2367
2368 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2369 xfrm_pol_put(xp);
2370 return 0;
2371
2372out:
2373 xp->walk.dead = 1;
2374 xfrm_policy_destroy(xp);
2375 return err;
2376}
2377
2378static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2379{
2380 struct net *net = sock_net(sk);
2381 int err;
2382 struct sadb_address *sa;
2383 struct sadb_x_policy *pol;
2384 struct xfrm_policy *xp;
2385 struct xfrm_selector sel;
2386 struct km_event c;
2387 struct sadb_x_sec_ctx *sec_ctx;
2388 struct xfrm_sec_ctx *pol_ctx = NULL;
2389
2390 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2391 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2392 !ext_hdrs[SADB_X_EXT_POLICY-1])
2393 return -EINVAL;
2394
2395 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2396 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2397 return -EINVAL;
2398
2399 memset(&sel, 0, sizeof(sel));
2400
2401 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2402 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2403 sel.prefixlen_s = sa->sadb_address_prefixlen;
2404 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2405 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2406 if (sel.sport)
2407 sel.sport_mask = htons(0xffff);
2408
2409 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2410 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2411 sel.prefixlen_d = sa->sadb_address_prefixlen;
2412 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2413 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2414 if (sel.dport)
2415 sel.dport_mask = htons(0xffff);
2416
2417 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2418 if (sec_ctx != NULL) {
2419 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2420
2421 if (!uctx)
2422 return -ENOMEM;
2423
2424 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2425 kfree(uctx);
2426 if (err)
2427 return err;
2428 }
2429
2430 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2431 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2432 1, &err);
2433 security_xfrm_policy_free(pol_ctx);
2434 if (xp == NULL)
2435 return -ENOENT;
2436
2437 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2438
2439 if (err)
2440 goto out;
2441
2442 c.seq = hdr->sadb_msg_seq;
2443 c.portid = hdr->sadb_msg_pid;
2444 c.data.byid = 0;
2445 c.event = XFRM_MSG_DELPOLICY;
2446 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2447
2448out:
2449 xfrm_pol_put(xp);
2450 return err;
2451}
2452
2453static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2454{
2455 int err;
2456 struct sk_buff *out_skb;
2457 struct sadb_msg *out_hdr;
2458 err = 0;
2459
2460 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2461 if (IS_ERR(out_skb)) {
2462 err = PTR_ERR(out_skb);
2463 goto out;
2464 }
2465 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2466 if (err < 0) {
2467 kfree_skb(out_skb);
2468 goto out;
2469 }
2470
2471 out_hdr = (struct sadb_msg *) out_skb->data;
2472 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2473 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2474 out_hdr->sadb_msg_satype = 0;
2475 out_hdr->sadb_msg_errno = 0;
2476 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2477 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2478 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2479 err = 0;
2480
2481out:
2482 return err;
2483}
2484
2485static int pfkey_sockaddr_pair_size(sa_family_t family)
2486{
2487 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2488}
2489
2490static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2491 xfrm_address_t *saddr, xfrm_address_t *daddr,
2492 u16 *family)
2493{
2494 int af, socklen;
2495
2496 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2497 return -EINVAL;
2498
2499 af = pfkey_sockaddr_extract(sa, saddr);
2500 if (!af)
2501 return -EINVAL;
2502
2503 socklen = pfkey_sockaddr_len(af);
2504 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2505 daddr) != af)
2506 return -EINVAL;
2507
2508 *family = af;
2509 return 0;
2510}
2511
2512#ifdef CONFIG_NET_KEY_MIGRATE
2513static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2514 struct xfrm_migrate *m)
2515{
2516 int err;
2517 struct sadb_x_ipsecrequest *rq2;
2518 int mode;
2519
2520 if (len < sizeof(*rq1) ||
2521 len < rq1->sadb_x_ipsecrequest_len ||
2522 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2523 return -EINVAL;
2524
2525 /* old endoints */
2526 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2527 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2528 &m->old_saddr, &m->old_daddr,
2529 &m->old_family);
2530 if (err)
2531 return err;
2532
2533 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2534 len -= rq1->sadb_x_ipsecrequest_len;
2535
2536 if (len <= sizeof(*rq2) ||
2537 len < rq2->sadb_x_ipsecrequest_len ||
2538 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2539 return -EINVAL;
2540
2541 /* new endpoints */
2542 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2543 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2544 &m->new_saddr, &m->new_daddr,
2545 &m->new_family);
2546 if (err)
2547 return err;
2548
2549 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2550 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2551 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2552 return -EINVAL;
2553
2554 m->proto = rq1->sadb_x_ipsecrequest_proto;
2555 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2556 return -EINVAL;
2557 m->mode = mode;
2558 m->old_reqid = rq1->sadb_x_ipsecrequest_reqid;
2559
2560 return ((int)(rq1->sadb_x_ipsecrequest_len +
2561 rq2->sadb_x_ipsecrequest_len));
2562}
2563
2564static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2565 const struct sadb_msg *hdr, void * const *ext_hdrs)
2566{
2567 int i, len, ret, err = -EINVAL;
2568 u8 dir;
2569 struct sadb_address *sa;
2570 struct sadb_x_kmaddress *kma;
2571 struct sadb_x_policy *pol;
2572 struct sadb_x_ipsecrequest *rq;
2573 struct xfrm_selector sel;
2574 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2575 struct xfrm_kmaddress k;
2576 struct net *net = sock_net(sk);
2577
2578 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2579 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2580 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2581 err = -EINVAL;
2582 goto out;
2583 }
2584
2585 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2586 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2587
2588 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2589 err = -EINVAL;
2590 goto out;
2591 }
2592
2593 if (kma) {
2594 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2595 k.reserved = kma->sadb_x_kmaddress_reserved;
2596 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2597 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2598 &k.local, &k.remote, &k.family);
2599 if (ret < 0) {
2600 err = ret;
2601 goto out;
2602 }
2603 }
2604
2605 dir = pol->sadb_x_policy_dir - 1;
2606 memset(&sel, 0, sizeof(sel));
2607
2608 /* set source address info of selector */
2609 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2610 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2611 sel.prefixlen_s = sa->sadb_address_prefixlen;
2612 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2613 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2614 if (sel.sport)
2615 sel.sport_mask = htons(0xffff);
2616
2617 /* set destination address info of selector */
2618 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2619 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2620 sel.prefixlen_d = sa->sadb_address_prefixlen;
2621 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2622 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2623 if (sel.dport)
2624 sel.dport_mask = htons(0xffff);
2625
2626 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2627
2628 /* extract ipsecrequests */
2629 i = 0;
2630 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2631
2632 while (len > 0 && i < XFRM_MAX_DEPTH) {
2633 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2634 if (ret < 0) {
2635 err = ret;
2636 goto out;
2637 } else {
2638 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2639 len -= ret;
2640 i++;
2641 }
2642 }
2643
2644 if (!i || len > 0) {
2645 err = -EINVAL;
2646 goto out;
2647 }
2648
2649 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2650 kma ? &k : NULL, net, NULL, 0, NULL, NULL);
2651
2652 out:
2653 return err;
2654}
2655#else
2656static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2657 const struct sadb_msg *hdr, void * const *ext_hdrs)
2658{
2659 return -ENOPROTOOPT;
2660}
2661#endif
2662
2663
2664static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2665{
2666 struct net *net = sock_net(sk);
2667 unsigned int dir;
2668 int err = 0, delete;
2669 struct sadb_x_policy *pol;
2670 struct xfrm_policy *xp;
2671 struct km_event c;
2672
2673 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2674 return -EINVAL;
2675
2676 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2677 if (dir >= XFRM_POLICY_MAX)
2678 return -EINVAL;
2679
2680 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2681 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2682 dir, pol->sadb_x_policy_id, delete, &err);
2683 if (xp == NULL)
2684 return -ENOENT;
2685
2686 if (delete) {
2687 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2688
2689 if (err)
2690 goto out;
2691 c.seq = hdr->sadb_msg_seq;
2692 c.portid = hdr->sadb_msg_pid;
2693 c.data.byid = 1;
2694 c.event = XFRM_MSG_DELPOLICY;
2695 km_policy_notify(xp, dir, &c);
2696 } else {
2697 err = key_pol_get_resp(sk, xp, hdr, dir);
2698 }
2699
2700out:
2701 xfrm_pol_put(xp);
2702 return err;
2703}
2704
2705static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2706{
2707 struct pfkey_sock *pfk = ptr;
2708 struct sk_buff *out_skb;
2709 struct sadb_msg *out_hdr;
2710 int err;
2711
2712 if (!pfkey_can_dump(&pfk->sk))
2713 return -ENOBUFS;
2714
2715 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2716 if (IS_ERR(out_skb))
2717 return PTR_ERR(out_skb);
2718
2719 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2720 if (err < 0) {
2721 kfree_skb(out_skb);
2722 return err;
2723 }
2724
2725 out_hdr = (struct sadb_msg *) out_skb->data;
2726 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2727 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2728 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2729 out_hdr->sadb_msg_errno = 0;
2730 out_hdr->sadb_msg_seq = count + 1;
2731 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2732
2733 if (pfk->dump.skb)
2734 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2735 &pfk->sk, sock_net(&pfk->sk));
2736 pfk->dump.skb = out_skb;
2737
2738 return 0;
2739}
2740
2741static int pfkey_dump_sp(struct pfkey_sock *pfk)
2742{
2743 struct net *net = sock_net(&pfk->sk);
2744 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2745}
2746
2747static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2748{
2749 struct net *net = sock_net((struct sock *)pfk);
2750
2751 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2752}
2753
2754static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2755{
2756 struct pfkey_sock *pfk = pfkey_sk(sk);
2757
2758 mutex_lock(&pfk->dump_lock);
2759 if (pfk->dump.dump != NULL) {
2760 mutex_unlock(&pfk->dump_lock);
2761 return -EBUSY;
2762 }
2763
2764 pfk->dump.msg_version = hdr->sadb_msg_version;
2765 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2766 pfk->dump.dump = pfkey_dump_sp;
2767 pfk->dump.done = pfkey_dump_sp_done;
2768 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2769 mutex_unlock(&pfk->dump_lock);
2770
2771 return pfkey_do_dump(pfk);
2772}
2773
2774static int key_notify_policy_flush(const struct km_event *c)
2775{
2776 struct sk_buff *skb_out;
2777 struct sadb_msg *hdr;
2778
2779 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2780 if (!skb_out)
2781 return -ENOBUFS;
2782 hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2783 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2784 hdr->sadb_msg_seq = c->seq;
2785 hdr->sadb_msg_pid = c->portid;
2786 hdr->sadb_msg_version = PF_KEY_V2;
2787 hdr->sadb_msg_errno = (uint8_t) 0;
2788 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2789 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2790 hdr->sadb_msg_reserved = 0;
2791 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2792 return 0;
2793
2794}
2795
2796static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2797{
2798 struct net *net = sock_net(sk);
2799 struct km_event c;
2800 int err, err2;
2801
2802 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2803 err2 = unicast_flush_resp(sk, hdr);
2804 if (err || err2) {
2805 if (err == -ESRCH) /* empty table - old silent behavior */
2806 return 0;
2807 return err;
2808 }
2809
2810 c.data.type = XFRM_POLICY_TYPE_MAIN;
2811 c.event = XFRM_MSG_FLUSHPOLICY;
2812 c.portid = hdr->sadb_msg_pid;
2813 c.seq = hdr->sadb_msg_seq;
2814 c.net = net;
2815 km_policy_notify(NULL, 0, &c);
2816
2817 return 0;
2818}
2819
2820typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2821 const struct sadb_msg *hdr, void * const *ext_hdrs);
2822static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2823 [SADB_RESERVED] = pfkey_reserved,
2824 [SADB_GETSPI] = pfkey_getspi,
2825 [SADB_UPDATE] = pfkey_add,
2826 [SADB_ADD] = pfkey_add,
2827 [SADB_DELETE] = pfkey_delete,
2828 [SADB_GET] = pfkey_get,
2829 [SADB_ACQUIRE] = pfkey_acquire,
2830 [SADB_REGISTER] = pfkey_register,
2831 [SADB_EXPIRE] = NULL,
2832 [SADB_FLUSH] = pfkey_flush,
2833 [SADB_DUMP] = pfkey_dump,
2834 [SADB_X_PROMISC] = pfkey_promisc,
2835 [SADB_X_PCHANGE] = NULL,
2836 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2837 [SADB_X_SPDADD] = pfkey_spdadd,
2838 [SADB_X_SPDDELETE] = pfkey_spddelete,
2839 [SADB_X_SPDGET] = pfkey_spdget,
2840 [SADB_X_SPDACQUIRE] = NULL,
2841 [SADB_X_SPDDUMP] = pfkey_spddump,
2842 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2843 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2844 [SADB_X_SPDDELETE2] = pfkey_spdget,
2845 [SADB_X_MIGRATE] = pfkey_migrate,
2846};
2847
2848static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2849{
2850 void *ext_hdrs[SADB_EXT_MAX];
2851 int err;
2852
2853 /* Non-zero return value of pfkey_broadcast() does not always signal
2854 * an error and even on an actual error we may still want to process
2855 * the message so rather ignore the return value.
2856 */
2857 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2858 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2859
2860 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2861 err = parse_exthdrs(skb, hdr, ext_hdrs);
2862 if (!err) {
2863 err = -EOPNOTSUPP;
2864 if (pfkey_funcs[hdr->sadb_msg_type])
2865 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2866 }
2867 return err;
2868}
2869
2870static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2871{
2872 struct sadb_msg *hdr = NULL;
2873
2874 if (skb->len < sizeof(*hdr)) {
2875 *errp = -EMSGSIZE;
2876 } else {
2877 hdr = (struct sadb_msg *) skb->data;
2878 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2879 hdr->sadb_msg_reserved != 0 ||
2880 (hdr->sadb_msg_type <= SADB_RESERVED ||
2881 hdr->sadb_msg_type > SADB_MAX)) {
2882 hdr = NULL;
2883 *errp = -EINVAL;
2884 } else if (hdr->sadb_msg_len != (skb->len /
2885 sizeof(uint64_t)) ||
2886 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2887 sizeof(uint64_t))) {
2888 hdr = NULL;
2889 *errp = -EMSGSIZE;
2890 } else {
2891 *errp = 0;
2892 }
2893 }
2894 return hdr;
2895}
2896
2897static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2898 const struct xfrm_algo_desc *d)
2899{
2900 unsigned int id = d->desc.sadb_alg_id;
2901
2902 if (id >= sizeof(t->aalgos) * 8)
2903 return 0;
2904
2905 return (t->aalgos >> id) & 1;
2906}
2907
2908static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2909 const struct xfrm_algo_desc *d)
2910{
2911 unsigned int id = d->desc.sadb_alg_id;
2912
2913 if (id >= sizeof(t->ealgos) * 8)
2914 return 0;
2915
2916 return (t->ealgos >> id) & 1;
2917}
2918
2919static int count_ah_combs(const struct xfrm_tmpl *t)
2920{
2921 int i, sz = 0;
2922
2923 for (i = 0; ; i++) {
2924 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2925 if (!aalg)
2926 break;
2927 if (!aalg->pfkey_supported)
2928 continue;
2929 if (aalg_tmpl_set(t, aalg))
2930 sz += sizeof(struct sadb_comb);
2931 }
2932 return sz + sizeof(struct sadb_prop);
2933}
2934
2935static int count_esp_combs(const struct xfrm_tmpl *t)
2936{
2937 int i, k, sz = 0;
2938
2939 for (i = 0; ; i++) {
2940 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2941 if (!ealg)
2942 break;
2943
2944 if (!ealg->pfkey_supported)
2945 continue;
2946
2947 if (!(ealg_tmpl_set(t, ealg)))
2948 continue;
2949
2950 for (k = 1; ; k++) {
2951 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2952 if (!aalg)
2953 break;
2954
2955 if (!aalg->pfkey_supported)
2956 continue;
2957
2958 if (aalg_tmpl_set(t, aalg))
2959 sz += sizeof(struct sadb_comb);
2960 }
2961 }
2962 return sz + sizeof(struct sadb_prop);
2963}
2964
2965static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2966{
2967 struct sadb_prop *p;
2968 int sz = 0;
2969 int i;
2970
2971 p = skb_put(skb, sizeof(struct sadb_prop));
2972 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2973 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2974 p->sadb_prop_replay = 32;
2975 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2976
2977 for (i = 0; ; i++) {
2978 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2979 if (!aalg)
2980 break;
2981
2982 if (!aalg->pfkey_supported)
2983 continue;
2984
2985 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2986 struct sadb_comb *c;
2987 c = skb_put_zero(skb, sizeof(struct sadb_comb));
2988 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2989 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2990 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2991 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2992 c->sadb_comb_hard_addtime = 24*60*60;
2993 c->sadb_comb_soft_addtime = 20*60*60;
2994 c->sadb_comb_hard_usetime = 8*60*60;
2995 c->sadb_comb_soft_usetime = 7*60*60;
2996 sz += sizeof(*c);
2997 }
2998 }
2999
3000 return sz + sizeof(*p);
3001}
3002
3003static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
3004{
3005 struct sadb_prop *p;
3006 int sz = 0;
3007 int i, k;
3008
3009 p = skb_put(skb, sizeof(struct sadb_prop));
3010 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
3011 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
3012 p->sadb_prop_replay = 32;
3013 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3014
3015 for (i=0; ; i++) {
3016 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3017 if (!ealg)
3018 break;
3019
3020 if (!ealg->pfkey_supported)
3021 continue;
3022
3023 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3024 continue;
3025
3026 for (k = 1; ; k++) {
3027 struct sadb_comb *c;
3028 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3029 if (!aalg)
3030 break;
3031 if (!aalg->pfkey_supported)
3032 continue;
3033 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3034 continue;
3035 c = skb_put(skb, sizeof(struct sadb_comb));
3036 memset(c, 0, sizeof(*c));
3037 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3038 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3039 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3040 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3041 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3042 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3043 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3044 c->sadb_comb_hard_addtime = 24*60*60;
3045 c->sadb_comb_soft_addtime = 20*60*60;
3046 c->sadb_comb_hard_usetime = 8*60*60;
3047 c->sadb_comb_soft_usetime = 7*60*60;
3048 sz += sizeof(*c);
3049 }
3050 }
3051
3052 return sz + sizeof(*p);
3053}
3054
3055static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3056{
3057 return 0;
3058}
3059
3060static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3061{
3062 struct sk_buff *out_skb;
3063 struct sadb_msg *out_hdr;
3064 int hard;
3065 int hsc;
3066
3067 hard = c->data.hard;
3068 if (hard)
3069 hsc = 2;
3070 else
3071 hsc = 1;
3072
3073 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3074 if (IS_ERR(out_skb))
3075 return PTR_ERR(out_skb);
3076
3077 out_hdr = (struct sadb_msg *) out_skb->data;
3078 out_hdr->sadb_msg_version = PF_KEY_V2;
3079 out_hdr->sadb_msg_type = SADB_EXPIRE;
3080 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3081 out_hdr->sadb_msg_errno = 0;
3082 out_hdr->sadb_msg_reserved = 0;
3083 out_hdr->sadb_msg_seq = 0;
3084 out_hdr->sadb_msg_pid = 0;
3085
3086 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3087 xs_net(x));
3088 return 0;
3089}
3090
3091static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3092{
3093 struct net *net = x ? xs_net(x) : c->net;
3094 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3095
3096 if (atomic_read(&net_pfkey->socks_nr) == 0)
3097 return 0;
3098
3099 switch (c->event) {
3100 case XFRM_MSG_EXPIRE:
3101 return key_notify_sa_expire(x, c);
3102 case XFRM_MSG_DELSA:
3103 case XFRM_MSG_NEWSA:
3104 case XFRM_MSG_UPDSA:
3105 return key_notify_sa(x, c);
3106 case XFRM_MSG_FLUSHSA:
3107 return key_notify_sa_flush(c);
3108 case XFRM_MSG_NEWAE: /* not yet supported */
3109 break;
3110 default:
3111 pr_err("pfkey: Unknown SA event %d\n", c->event);
3112 break;
3113 }
3114
3115 return 0;
3116}
3117
3118static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3119{
3120 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3121 return 0;
3122
3123 switch (c->event) {
3124 case XFRM_MSG_POLEXPIRE:
3125 return key_notify_policy_expire(xp, c);
3126 case XFRM_MSG_DELPOLICY:
3127 case XFRM_MSG_NEWPOLICY:
3128 case XFRM_MSG_UPDPOLICY:
3129 return key_notify_policy(xp, dir, c);
3130 case XFRM_MSG_FLUSHPOLICY:
3131 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3132 break;
3133 return key_notify_policy_flush(c);
3134 default:
3135 pr_err("pfkey: Unknown policy event %d\n", c->event);
3136 break;
3137 }
3138
3139 return 0;
3140}
3141
3142static u32 get_acqseq(void)
3143{
3144 u32 res;
3145 static atomic_t acqseq;
3146
3147 do {
3148 res = atomic_inc_return(&acqseq);
3149 } while (!res);
3150 return res;
3151}
3152
3153static bool pfkey_is_alive(const struct km_event *c)
3154{
3155 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3156 struct sock *sk;
3157 bool is_alive = false;
3158
3159 rcu_read_lock();
3160 sk_for_each_rcu(sk, &net_pfkey->table) {
3161 if (pfkey_sk(sk)->registered) {
3162 is_alive = true;
3163 break;
3164 }
3165 }
3166 rcu_read_unlock();
3167
3168 return is_alive;
3169}
3170
3171static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3172{
3173 struct sk_buff *skb;
3174 struct sadb_msg *hdr;
3175 struct sadb_address *addr;
3176 struct sadb_x_policy *pol;
3177 int sockaddr_size;
3178 int size;
3179 struct sadb_x_sec_ctx *sec_ctx;
3180 struct xfrm_sec_ctx *xfrm_ctx;
3181 int ctx_size = 0;
3182 int alg_size = 0;
3183
3184 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3185 if (!sockaddr_size)
3186 return -EINVAL;
3187
3188 size = sizeof(struct sadb_msg) +
3189 (sizeof(struct sadb_address) * 2) +
3190 (sockaddr_size * 2) +
3191 sizeof(struct sadb_x_policy);
3192
3193 if (x->id.proto == IPPROTO_AH)
3194 alg_size = count_ah_combs(t);
3195 else if (x->id.proto == IPPROTO_ESP)
3196 alg_size = count_esp_combs(t);
3197
3198 if ((xfrm_ctx = x->security)) {
3199 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3200 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3201 }
3202
3203 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3204 if (skb == NULL)
3205 return -ENOMEM;
3206
3207 hdr = skb_put(skb, sizeof(struct sadb_msg));
3208 hdr->sadb_msg_version = PF_KEY_V2;
3209 hdr->sadb_msg_type = SADB_ACQUIRE;
3210 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3211 hdr->sadb_msg_len = size / sizeof(uint64_t);
3212 hdr->sadb_msg_errno = 0;
3213 hdr->sadb_msg_reserved = 0;
3214 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3215 hdr->sadb_msg_pid = 0;
3216
3217 /* src address */
3218 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3219 addr->sadb_address_len =
3220 (sizeof(struct sadb_address)+sockaddr_size)/
3221 sizeof(uint64_t);
3222 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3223 addr->sadb_address_proto = 0;
3224 addr->sadb_address_reserved = 0;
3225 addr->sadb_address_prefixlen =
3226 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0,
3227 (struct sockaddr *)(addr + 1),
3228 x->props.family);
3229 if (!addr->sadb_address_prefixlen)
3230 BUG();
3231
3232 /* dst address */
3233 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3234 addr->sadb_address_len =
3235 (sizeof(struct sadb_address)+sockaddr_size)/
3236 sizeof(uint64_t);
3237 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3238 addr->sadb_address_proto = 0;
3239 addr->sadb_address_reserved = 0;
3240 addr->sadb_address_prefixlen =
3241 pfkey_sockaddr_fill_zero_tail(&x->id.daddr, 0,
3242 (struct sockaddr *)(addr + 1),
3243 x->props.family);
3244 if (!addr->sadb_address_prefixlen)
3245 BUG();
3246
3247 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3248 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3249 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3250 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3251 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3252 pol->sadb_x_policy_reserved = 0;
3253 pol->sadb_x_policy_id = xp->index;
3254 pol->sadb_x_policy_priority = xp->priority;
3255
3256 /* Set sadb_comb's. */
3257 alg_size = 0;
3258 if (x->id.proto == IPPROTO_AH)
3259 alg_size = dump_ah_combs(skb, t);
3260 else if (x->id.proto == IPPROTO_ESP)
3261 alg_size = dump_esp_combs(skb, t);
3262
3263 hdr->sadb_msg_len += alg_size / 8;
3264
3265 /* security context */
3266 if (xfrm_ctx) {
3267 sec_ctx = skb_put(skb,
3268 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3269 sec_ctx->sadb_x_sec_len =
3270 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3271 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3272 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3273 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3274 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3275 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3276 xfrm_ctx->ctx_len);
3277 }
3278
3279 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3280 xs_net(x));
3281}
3282
3283static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3284 u8 *data, int len, int *dir)
3285{
3286 struct net *net = sock_net(sk);
3287 struct xfrm_policy *xp;
3288 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3289 struct sadb_x_sec_ctx *sec_ctx;
3290
3291 switch (sk->sk_family) {
3292 case AF_INET:
3293 if (opt != IP_IPSEC_POLICY) {
3294 *dir = -EOPNOTSUPP;
3295 return NULL;
3296 }
3297 break;
3298#if IS_ENABLED(CONFIG_IPV6)
3299 case AF_INET6:
3300 if (opt != IPV6_IPSEC_POLICY) {
3301 *dir = -EOPNOTSUPP;
3302 return NULL;
3303 }
3304 break;
3305#endif
3306 default:
3307 *dir = -EINVAL;
3308 return NULL;
3309 }
3310
3311 *dir = -EINVAL;
3312
3313 if (len < sizeof(struct sadb_x_policy) ||
3314 pol->sadb_x_policy_len*8 > len ||
3315 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3316 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3317 return NULL;
3318
3319 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3320 if (xp == NULL) {
3321 *dir = -ENOBUFS;
3322 return NULL;
3323 }
3324
3325 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3326 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3327
3328 xp->lft.soft_byte_limit = XFRM_INF;
3329 xp->lft.hard_byte_limit = XFRM_INF;
3330 xp->lft.soft_packet_limit = XFRM_INF;
3331 xp->lft.hard_packet_limit = XFRM_INF;
3332 xp->family = sk->sk_family;
3333
3334 xp->xfrm_nr = 0;
3335 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3336 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3337 goto out;
3338
3339 /* security context too */
3340 if (len >= (pol->sadb_x_policy_len*8 +
3341 sizeof(struct sadb_x_sec_ctx))) {
3342 char *p = (char *)pol;
3343 struct xfrm_user_sec_ctx *uctx;
3344
3345 p += pol->sadb_x_policy_len*8;
3346 sec_ctx = (struct sadb_x_sec_ctx *)p;
3347 if (len < pol->sadb_x_policy_len*8 +
3348 sec_ctx->sadb_x_sec_len*8) {
3349 *dir = -EINVAL;
3350 goto out;
3351 }
3352 if ((*dir = verify_sec_ctx_len(p)))
3353 goto out;
3354 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3355 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3356 kfree(uctx);
3357
3358 if (*dir)
3359 goto out;
3360 }
3361
3362 *dir = pol->sadb_x_policy_dir-1;
3363 return xp;
3364
3365out:
3366 xp->walk.dead = 1;
3367 xfrm_policy_destroy(xp);
3368 return NULL;
3369}
3370
3371static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3372{
3373 struct sk_buff *skb;
3374 struct sadb_msg *hdr;
3375 struct sadb_sa *sa;
3376 struct sadb_address *addr;
3377 struct sadb_x_nat_t_port *n_port;
3378 int sockaddr_size;
3379 int size;
3380 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3381 struct xfrm_encap_tmpl *natt = NULL;
3382
3383 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3384 if (!sockaddr_size)
3385 return -EINVAL;
3386
3387 if (!satype)
3388 return -EINVAL;
3389
3390 if (!x->encap)
3391 return -EINVAL;
3392
3393 natt = x->encap;
3394
3395 /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3396 *
3397 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3398 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3399 */
3400
3401 size = sizeof(struct sadb_msg) +
3402 sizeof(struct sadb_sa) +
3403 (sizeof(struct sadb_address) * 2) +
3404 (sockaddr_size * 2) +
3405 (sizeof(struct sadb_x_nat_t_port) * 2);
3406
3407 skb = alloc_skb(size + 16, GFP_ATOMIC);
3408 if (skb == NULL)
3409 return -ENOMEM;
3410
3411 hdr = skb_put(skb, sizeof(struct sadb_msg));
3412 hdr->sadb_msg_version = PF_KEY_V2;
3413 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3414 hdr->sadb_msg_satype = satype;
3415 hdr->sadb_msg_len = size / sizeof(uint64_t);
3416 hdr->sadb_msg_errno = 0;
3417 hdr->sadb_msg_reserved = 0;
3418 hdr->sadb_msg_seq = x->km.seq;
3419 hdr->sadb_msg_pid = 0;
3420
3421 /* SA */
3422 sa = skb_put(skb, sizeof(struct sadb_sa));
3423 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3424 sa->sadb_sa_exttype = SADB_EXT_SA;
3425 sa->sadb_sa_spi = x->id.spi;
3426 sa->sadb_sa_replay = 0;
3427 sa->sadb_sa_state = 0;
3428 sa->sadb_sa_auth = 0;
3429 sa->sadb_sa_encrypt = 0;
3430 sa->sadb_sa_flags = 0;
3431
3432 /* ADDRESS_SRC (old addr) */
3433 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3434 addr->sadb_address_len =
3435 (sizeof(struct sadb_address)+sockaddr_size)/
3436 sizeof(uint64_t);
3437 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3438 addr->sadb_address_proto = 0;
3439 addr->sadb_address_reserved = 0;
3440 addr->sadb_address_prefixlen =
3441 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0,
3442 (struct sockaddr *)(addr + 1),
3443 x->props.family);
3444 if (!addr->sadb_address_prefixlen)
3445 BUG();
3446
3447 /* NAT_T_SPORT (old port) */
3448 n_port = skb_put(skb, sizeof(*n_port));
3449 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3450 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3451 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3452 n_port->sadb_x_nat_t_port_reserved = 0;
3453
3454 /* ADDRESS_DST (new addr) */
3455 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3456 addr->sadb_address_len =
3457 (sizeof(struct sadb_address)+sockaddr_size)/
3458 sizeof(uint64_t);
3459 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3460 addr->sadb_address_proto = 0;
3461 addr->sadb_address_reserved = 0;
3462 addr->sadb_address_prefixlen =
3463 pfkey_sockaddr_fill_zero_tail(ipaddr, 0,
3464 (struct sockaddr *)(addr + 1),
3465 x->props.family);
3466 if (!addr->sadb_address_prefixlen)
3467 BUG();
3468
3469 /* NAT_T_DPORT (new port) */
3470 n_port = skb_put(skb, sizeof(*n_port));
3471 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3472 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3473 n_port->sadb_x_nat_t_port_port = sport;
3474 n_port->sadb_x_nat_t_port_reserved = 0;
3475
3476 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3477 xs_net(x));
3478}
3479
3480#ifdef CONFIG_NET_KEY_MIGRATE
3481static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3482 const struct xfrm_selector *sel)
3483{
3484 struct sadb_address *addr;
3485 addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3486 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3487 addr->sadb_address_exttype = type;
3488 addr->sadb_address_proto = sel->proto;
3489 addr->sadb_address_reserved = 0;
3490
3491 switch (type) {
3492 case SADB_EXT_ADDRESS_SRC:
3493 addr->sadb_address_prefixlen = sel->prefixlen_s;
3494 pfkey_sockaddr_fill_zero_tail(&sel->saddr, 0,
3495 (struct sockaddr *)(addr + 1),
3496 sel->family);
3497 break;
3498 case SADB_EXT_ADDRESS_DST:
3499 addr->sadb_address_prefixlen = sel->prefixlen_d;
3500 pfkey_sockaddr_fill_zero_tail(&sel->daddr, 0,
3501 (struct sockaddr *)(addr + 1),
3502 sel->family);
3503 break;
3504 default:
3505 return -EINVAL;
3506 }
3507
3508 return 0;
3509}
3510
3511
3512static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3513{
3514 struct sadb_x_kmaddress *kma;
3515 u8 *sa;
3516 int family = k->family;
3517 int socklen = pfkey_sockaddr_len(family);
3518 int size_req;
3519
3520 size_req = (sizeof(struct sadb_x_kmaddress) +
3521 pfkey_sockaddr_pair_size(family));
3522
3523 kma = skb_put_zero(skb, size_req);
3524 kma->sadb_x_kmaddress_len = size_req / 8;
3525 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3526 kma->sadb_x_kmaddress_reserved = k->reserved;
3527
3528 sa = (u8 *)(kma + 1);
3529 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3530 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3531 return -EINVAL;
3532
3533 return 0;
3534}
3535
3536static int set_ipsecrequest(struct sk_buff *skb,
3537 uint8_t proto, uint8_t mode, int level,
3538 uint32_t reqid, sa_family_t family,
3539 const xfrm_address_t *src, const xfrm_address_t *dst)
3540{
3541 struct sadb_x_ipsecrequest *rq;
3542 u8 *sa;
3543 int socklen = pfkey_sockaddr_len(family);
3544 int size_req;
3545
3546 size_req = sizeof(struct sadb_x_ipsecrequest) +
3547 pfkey_sockaddr_pair_size(family);
3548
3549 rq = skb_put_zero(skb, size_req);
3550 rq->sadb_x_ipsecrequest_len = size_req;
3551 rq->sadb_x_ipsecrequest_proto = proto;
3552 rq->sadb_x_ipsecrequest_mode = mode;
3553 rq->sadb_x_ipsecrequest_level = level;
3554 rq->sadb_x_ipsecrequest_reqid = reqid;
3555
3556 sa = (u8 *) (rq + 1);
3557 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3558 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3559 return -EINVAL;
3560
3561 return 0;
3562}
3563#endif
3564
3565#ifdef CONFIG_NET_KEY_MIGRATE
3566static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3567 const struct xfrm_migrate *m, int num_bundles,
3568 const struct xfrm_kmaddress *k, struct net *net,
3569 const struct xfrm_encap_tmpl *encap)
3570{
3571 int i;
3572 int sasize_sel;
3573 int size = 0;
3574 int size_pol = 0;
3575 struct sk_buff *skb;
3576 struct sadb_msg *hdr;
3577 struct sadb_x_policy *pol;
3578 const struct xfrm_migrate *mp;
3579
3580 if (type != XFRM_POLICY_TYPE_MAIN)
3581 return 0;
3582
3583 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3584 return -EINVAL;
3585
3586 if (k != NULL) {
3587 /* addresses for KM */
3588 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3589 pfkey_sockaddr_pair_size(k->family));
3590 }
3591
3592 /* selector */
3593 sasize_sel = pfkey_sockaddr_size(sel->family);
3594 if (!sasize_sel)
3595 return -EINVAL;
3596 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3597
3598 /* policy info */
3599 size_pol += sizeof(struct sadb_x_policy);
3600
3601 /* ipsecrequests */
3602 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3603 int pair_size;
3604
3605 pair_size = pfkey_sockaddr_pair_size(mp->old_family);
3606 if (!pair_size)
3607 return -EINVAL;
3608 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size;
3609
3610 pair_size = pfkey_sockaddr_pair_size(mp->new_family);
3611 if (!pair_size)
3612 return -EINVAL;
3613 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size;
3614 }
3615
3616 size += sizeof(struct sadb_msg) + size_pol;
3617
3618 /* alloc buffer */
3619 skb = alloc_skb(size, GFP_ATOMIC);
3620 if (skb == NULL)
3621 return -ENOMEM;
3622
3623 hdr = skb_put(skb, sizeof(struct sadb_msg));
3624 hdr->sadb_msg_version = PF_KEY_V2;
3625 hdr->sadb_msg_type = SADB_X_MIGRATE;
3626 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3627 hdr->sadb_msg_len = size / 8;
3628 hdr->sadb_msg_errno = 0;
3629 hdr->sadb_msg_reserved = 0;
3630 hdr->sadb_msg_seq = 0;
3631 hdr->sadb_msg_pid = 0;
3632
3633 /* Addresses to be used by KM for negotiation, if ext is available */
3634 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3635 goto err;
3636
3637 /* selector src */
3638 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3639
3640 /* selector dst */
3641 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3642
3643 /* policy information */
3644 pol = skb_put(skb, sizeof(struct sadb_x_policy));
3645 pol->sadb_x_policy_len = size_pol / 8;
3646 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3647 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3648 pol->sadb_x_policy_dir = dir + 1;
3649 pol->sadb_x_policy_reserved = 0;
3650 pol->sadb_x_policy_id = 0;
3651 pol->sadb_x_policy_priority = 0;
3652
3653 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3654 /* old ipsecrequest */
3655 int mode = pfkey_mode_from_xfrm(mp->mode);
3656 if (mode < 0)
3657 goto err;
3658 if (set_ipsecrequest(skb, mp->proto, mode,
3659 (mp->old_reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3660 mp->old_reqid, mp->old_family,
3661 &mp->old_saddr, &mp->old_daddr) < 0)
3662 goto err;
3663
3664 /* new ipsecrequest */
3665 if (set_ipsecrequest(skb, mp->proto, mode,
3666 (mp->old_reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3667 mp->old_reqid, mp->new_family,
3668 &mp->new_saddr, &mp->new_daddr) < 0)
3669 goto err;
3670 }
3671
3672 /* broadcast migrate message to sockets */
3673 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net);
3674
3675 return 0;
3676
3677err:
3678 kfree_skb(skb);
3679 return -EINVAL;
3680}
3681#else
3682static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3683 const struct xfrm_migrate *m, int num_bundles,
3684 const struct xfrm_kmaddress *k, struct net *net,
3685 const struct xfrm_encap_tmpl *encap)
3686{
3687 return -ENOPROTOOPT;
3688}
3689#endif
3690
3691static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3692{
3693 struct sock *sk = sock->sk;
3694 struct sk_buff *skb = NULL;
3695 struct sadb_msg *hdr = NULL;
3696 int err;
3697 struct net *net = sock_net(sk);
3698
3699 err = -EOPNOTSUPP;
3700 if (msg->msg_flags & MSG_OOB)
3701 goto out;
3702
3703 err = -EMSGSIZE;
3704 if ((unsigned int)len > sk->sk_sndbuf - 32)
3705 goto out;
3706
3707 err = -ENOBUFS;
3708 skb = alloc_skb(len, GFP_KERNEL);
3709 if (skb == NULL)
3710 goto out;
3711
3712 err = -EFAULT;
3713 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3714 goto out;
3715
3716 hdr = pfkey_get_base_msg(skb, &err);
3717 if (!hdr)
3718 goto out;
3719
3720 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3721 err = pfkey_process(sk, skb, hdr);
3722 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3723
3724out:
3725 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3726 err = 0;
3727 kfree_skb(skb);
3728
3729 return err ? : len;
3730}
3731
3732static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3733 int flags)
3734{
3735 struct sock *sk = sock->sk;
3736 struct pfkey_sock *pfk = pfkey_sk(sk);
3737 struct sk_buff *skb;
3738 int copied, err;
3739
3740 err = -EINVAL;
3741 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3742 goto out;
3743
3744 skb = skb_recv_datagram(sk, flags, &err);
3745 if (skb == NULL)
3746 goto out;
3747
3748 copied = skb->len;
3749 if (copied > len) {
3750 msg->msg_flags |= MSG_TRUNC;
3751 copied = len;
3752 }
3753
3754 skb_reset_transport_header(skb);
3755 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3756 if (err)
3757 goto out_free;
3758
3759 sock_recv_cmsgs(msg, sk, skb);
3760
3761 err = (flags & MSG_TRUNC) ? skb->len : copied;
3762
3763 if (pfk->dump.dump != NULL &&
3764 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3765 pfkey_do_dump(pfk);
3766
3767out_free:
3768 skb_free_datagram(sk, skb);
3769out:
3770 return err;
3771}
3772
3773static const struct proto_ops pfkey_ops = {
3774 .family = PF_KEY,
3775 .owner = THIS_MODULE,
3776 /* Operations that make no sense on pfkey sockets. */
3777 .bind = sock_no_bind,
3778 .connect = sock_no_connect,
3779 .socketpair = sock_no_socketpair,
3780 .accept = sock_no_accept,
3781 .getname = sock_no_getname,
3782 .ioctl = sock_no_ioctl,
3783 .listen = sock_no_listen,
3784 .shutdown = sock_no_shutdown,
3785 .mmap = sock_no_mmap,
3786
3787 /* Now the operations that really occur. */
3788 .release = pfkey_release,
3789 .poll = datagram_poll,
3790 .sendmsg = pfkey_sendmsg,
3791 .recvmsg = pfkey_recvmsg,
3792};
3793
3794static const struct net_proto_family pfkey_family_ops = {
3795 .family = PF_KEY,
3796 .create = pfkey_create,
3797 .owner = THIS_MODULE,
3798};
3799
3800#ifdef CONFIG_PROC_FS
3801static int pfkey_seq_show(struct seq_file *f, void *v)
3802{
3803 struct sock *s = sk_entry(v);
3804
3805 if (v == SEQ_START_TOKEN)
3806 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3807 else
3808 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6llu\n",
3809 s,
3810 refcount_read(&s->sk_refcnt),
3811 sk_rmem_alloc_get(s),
3812 sk_wmem_alloc_get(s),
3813 from_kuid_munged(seq_user_ns(f), sk_uid(s)),
3814 sock_i_ino(s)
3815 );
3816 return 0;
3817}
3818
3819static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3820 __acquires(rcu)
3821{
3822 struct net *net = seq_file_net(f);
3823 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3824
3825 rcu_read_lock();
3826 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3827}
3828
3829static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3830{
3831 struct net *net = seq_file_net(f);
3832 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3833
3834 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3835}
3836
3837static void pfkey_seq_stop(struct seq_file *f, void *v)
3838 __releases(rcu)
3839{
3840 rcu_read_unlock();
3841}
3842
3843static const struct seq_operations pfkey_seq_ops = {
3844 .start = pfkey_seq_start,
3845 .next = pfkey_seq_next,
3846 .stop = pfkey_seq_stop,
3847 .show = pfkey_seq_show,
3848};
3849
3850static int __net_init pfkey_init_proc(struct net *net)
3851{
3852 struct proc_dir_entry *e;
3853
3854 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3855 sizeof(struct seq_net_private));
3856 if (e == NULL)
3857 return -ENOMEM;
3858
3859 return 0;
3860}
3861
3862static void __net_exit pfkey_exit_proc(struct net *net)
3863{
3864 remove_proc_entry("pfkey", net->proc_net);
3865}
3866#else
3867static inline int pfkey_init_proc(struct net *net)
3868{
3869 return 0;
3870}
3871
3872static inline void pfkey_exit_proc(struct net *net)
3873{
3874}
3875#endif
3876
3877static struct xfrm_mgr pfkeyv2_mgr =
3878{
3879 .notify = pfkey_send_notify,
3880 .acquire = pfkey_send_acquire,
3881 .compile_policy = pfkey_compile_policy,
3882 .new_mapping = pfkey_send_new_mapping,
3883 .notify_policy = pfkey_send_policy_notify,
3884 .migrate = pfkey_send_migrate,
3885 .is_alive = pfkey_is_alive,
3886};
3887
3888static int __net_init pfkey_net_init(struct net *net)
3889{
3890 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3891 int rv;
3892
3893 INIT_HLIST_HEAD(&net_pfkey->table);
3894 atomic_set(&net_pfkey->socks_nr, 0);
3895
3896 rv = pfkey_init_proc(net);
3897
3898 return rv;
3899}
3900
3901static void __net_exit pfkey_net_exit(struct net *net)
3902{
3903 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3904
3905 pfkey_exit_proc(net);
3906 WARN_ON(!hlist_empty(&net_pfkey->table));
3907}
3908
3909static struct pernet_operations pfkey_net_ops = {
3910 .init = pfkey_net_init,
3911 .exit = pfkey_net_exit,
3912 .id = &pfkey_net_id,
3913 .size = sizeof(struct netns_pfkey),
3914};
3915
3916static void __exit ipsec_pfkey_exit(void)
3917{
3918 xfrm_unregister_km(&pfkeyv2_mgr);
3919 sock_unregister(PF_KEY);
3920 unregister_pernet_subsys(&pfkey_net_ops);
3921 proto_unregister(&key_proto);
3922}
3923
3924static int __init ipsec_pfkey_init(void)
3925{
3926 int err = proto_register(&key_proto, 0);
3927
3928 pr_warn_once("PFKEY is deprecated and scheduled to be removed in 2027, "
3929 "please contact the netdev mailing list\n");
3930 if (err != 0)
3931 goto out;
3932
3933 err = register_pernet_subsys(&pfkey_net_ops);
3934 if (err != 0)
3935 goto out_unregister_key_proto;
3936 err = sock_register(&pfkey_family_ops);
3937 if (err != 0)
3938 goto out_unregister_pernet;
3939 xfrm_register_km(&pfkeyv2_mgr);
3940out:
3941 return err;
3942
3943out_unregister_pernet:
3944 unregister_pernet_subsys(&pfkey_net_ops);
3945out_unregister_key_proto:
3946 proto_unregister(&key_proto);
3947 goto out;
3948}
3949
3950module_init(ipsec_pfkey_init);
3951module_exit(ipsec_pfkey_exit);
3952MODULE_DESCRIPTION("PF_KEY socket helpers");
3953MODULE_LICENSE("GPL");
3954MODULE_ALIAS_NETPROTO(PF_KEY);