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17#include <linux/capability.h>
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/socket.h>
21#include <linux/pfkeyv2.h>
22#include <linux/ipsec.h>
23#include <linux/skbuff.h>
24#include <linux/rtnetlink.h>
25#include <linux/in.h>
26#include <linux/in6.h>
27#include <linux/proc_fs.h>
28#include <linux/init.h>
29#include <linux/slab.h>
30#include <net/net_namespace.h>
31#include <net/netns/generic.h>
32#include <net/xfrm.h>
33
34#include <net/sock.h>
35
36#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39static unsigned int pfkey_net_id __read_mostly;
40struct netns_pfkey {
41
42 struct hlist_head table;
43 atomic_t socks_nr;
44};
45static DEFINE_MUTEX(pfkey_mutex);
46
47#define DUMMY_MARK 0
48static const struct xfrm_mark dummy_mark = {0, 0};
49struct pfkey_sock {
50
51 struct sock sk;
52 int registered;
53 int promisc;
54
55 struct {
56 uint8_t msg_version;
57 uint32_t msg_portid;
58 int (*dump)(struct pfkey_sock *sk);
59 void (*done)(struct pfkey_sock *sk);
60 union {
61 struct xfrm_policy_walk policy;
62 struct xfrm_state_walk state;
63 } u;
64 struct sk_buff *skb;
65 } dump;
66 struct mutex dump_lock;
67};
68
69static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
70 xfrm_address_t *saddr, xfrm_address_t *daddr,
71 u16 *family);
72
73static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
74{
75 return (struct pfkey_sock *)sk;
76}
77
78static int pfkey_can_dump(const struct sock *sk)
79{
80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
81 return 1;
82 return 0;
83}
84
85static void pfkey_terminate_dump(struct pfkey_sock *pfk)
86{
87 if (pfk->dump.dump) {
88 if (pfk->dump.skb) {
89 kfree_skb(pfk->dump.skb);
90 pfk->dump.skb = NULL;
91 }
92 pfk->dump.done(pfk);
93 pfk->dump.dump = NULL;
94 pfk->dump.done = NULL;
95 }
96}
97
98static void pfkey_sock_destruct(struct sock *sk)
99{
100 struct net *net = sock_net(sk);
101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
102
103 pfkey_terminate_dump(pfkey_sk(sk));
104 skb_queue_purge(&sk->sk_receive_queue);
105
106 if (!sock_flag(sk, SOCK_DEAD)) {
107 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
108 return;
109 }
110
111 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
112 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
113
114 atomic_dec(&net_pfkey->socks_nr);
115}
116
117static const struct proto_ops pfkey_ops;
118
119static void pfkey_insert(struct sock *sk)
120{
121 struct net *net = sock_net(sk);
122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
123
124 mutex_lock(&pfkey_mutex);
125 sk_add_node_rcu(sk, &net_pfkey->table);
126 mutex_unlock(&pfkey_mutex);
127}
128
129static void pfkey_remove(struct sock *sk)
130{
131 mutex_lock(&pfkey_mutex);
132 sk_del_node_init_rcu(sk);
133 mutex_unlock(&pfkey_mutex);
134}
135
136static struct proto key_proto = {
137 .name = "KEY",
138 .owner = THIS_MODULE,
139 .obj_size = sizeof(struct pfkey_sock),
140};
141
142static int pfkey_create(struct net *net, struct socket *sock, int protocol,
143 int kern)
144{
145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
146 struct sock *sk;
147 struct pfkey_sock *pfk;
148 int err;
149
150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
151 return -EPERM;
152 if (sock->type != SOCK_RAW)
153 return -ESOCKTNOSUPPORT;
154 if (protocol != PF_KEY_V2)
155 return -EPROTONOSUPPORT;
156
157 err = -ENOMEM;
158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
159 if (sk == NULL)
160 goto out;
161
162 pfk = pfkey_sk(sk);
163 mutex_init(&pfk->dump_lock);
164
165 sock->ops = &pfkey_ops;
166 sock_init_data(sock, sk);
167
168 sk->sk_family = PF_KEY;
169 sk->sk_destruct = pfkey_sock_destruct;
170
171 atomic_inc(&net_pfkey->socks_nr);
172
173 pfkey_insert(sk);
174
175 return 0;
176out:
177 return err;
178}
179
180static int pfkey_release(struct socket *sock)
181{
182 struct sock *sk = sock->sk;
183
184 if (!sk)
185 return 0;
186
187 pfkey_remove(sk);
188
189 sock_orphan(sk);
190 sock->sk = NULL;
191 skb_queue_purge(&sk->sk_write_queue);
192
193 synchronize_rcu();
194 sock_put(sk);
195
196 return 0;
197}
198
199static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
200 gfp_t allocation, struct sock *sk)
201{
202 int err = -ENOBUFS;
203
204 sock_hold(sk);
205 if (*skb2 == NULL) {
206 if (atomic_read(&skb->users) != 1) {
207 *skb2 = skb_clone(skb, allocation);
208 } else {
209 *skb2 = skb;
210 atomic_inc(&skb->users);
211 }
212 }
213 if (*skb2 != NULL) {
214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
215 skb_set_owner_r(*skb2, sk);
216 skb_queue_tail(&sk->sk_receive_queue, *skb2);
217 sk->sk_data_ready(sk);
218 *skb2 = NULL;
219 err = 0;
220 }
221 }
222 sock_put(sk);
223 return err;
224}
225
226
227#define BROADCAST_ALL 0
228#define BROADCAST_ONE 1
229#define BROADCAST_REGISTERED 2
230#define BROADCAST_PROMISC_ONLY 4
231static int pfkey_broadcast(struct sk_buff *skb,
232 int broadcast_flags, struct sock *one_sk,
233 struct net *net)
234{
235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
236 struct sock *sk;
237 struct sk_buff *skb2 = NULL;
238 int err = -ESRCH;
239
240
241
242
243 if (!skb)
244 return -ENOMEM;
245
246 rcu_read_lock();
247 sk_for_each_rcu(sk, &net_pfkey->table) {
248 struct pfkey_sock *pfk = pfkey_sk(sk);
249 int err2;
250
251
252
253
254
255 if (pfk->promisc)
256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
257
258
259 if (sk == one_sk)
260 continue;
261 if (broadcast_flags != BROADCAST_ALL) {
262 if (broadcast_flags & BROADCAST_PROMISC_ONLY)
263 continue;
264 if ((broadcast_flags & BROADCAST_REGISTERED) &&
265 !pfk->registered)
266 continue;
267 if (broadcast_flags & BROADCAST_ONE)
268 continue;
269 }
270
271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
272
273
274
275 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
276 err = err2;
277 }
278 rcu_read_unlock();
279
280 if (one_sk != NULL)
281 err = pfkey_broadcast_one(skb, &skb2, GFP_KERNEL, one_sk);
282
283 kfree_skb(skb2);
284 kfree_skb(skb);
285 return err;
286}
287
288static int pfkey_do_dump(struct pfkey_sock *pfk)
289{
290 struct sadb_msg *hdr;
291 int rc;
292
293 mutex_lock(&pfk->dump_lock);
294 if (!pfk->dump.dump) {
295 rc = 0;
296 goto out;
297 }
298
299 rc = pfk->dump.dump(pfk);
300 if (rc == -ENOBUFS) {
301 rc = 0;
302 goto out;
303 }
304
305 if (pfk->dump.skb) {
306 if (!pfkey_can_dump(&pfk->sk)) {
307 rc = 0;
308 goto out;
309 }
310
311 hdr = (struct sadb_msg *) pfk->dump.skb->data;
312 hdr->sadb_msg_seq = 0;
313 hdr->sadb_msg_errno = rc;
314 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
315 &pfk->sk, sock_net(&pfk->sk));
316 pfk->dump.skb = NULL;
317 }
318
319 pfkey_terminate_dump(pfk);
320
321out:
322 mutex_unlock(&pfk->dump_lock);
323 return rc;
324}
325
326static inline void pfkey_hdr_dup(struct sadb_msg *new,
327 const struct sadb_msg *orig)
328{
329 *new = *orig;
330}
331
332static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
333{
334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
335 struct sadb_msg *hdr;
336
337 if (!skb)
338 return -ENOBUFS;
339
340
341
342
343 err = -err;
344 if (err == ERESTARTSYS ||
345 err == ERESTARTNOHAND ||
346 err == ERESTARTNOINTR)
347 err = EINTR;
348 if (err >= 512)
349 err = EINVAL;
350 BUG_ON(err <= 0 || err >= 256);
351
352 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
353 pfkey_hdr_dup(hdr, orig);
354 hdr->sadb_msg_errno = (uint8_t) err;
355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
356 sizeof(uint64_t));
357
358 pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
359
360 return 0;
361}
362
363static const u8 sadb_ext_min_len[] = {
364 [SADB_EXT_RESERVED] = (u8) 0,
365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa),
366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime),
368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime),
369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address),
370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address),
371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address),
372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key),
373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key),
374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident),
375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident),
376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens),
377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop),
378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported),
379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported),
380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange),
381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate),
382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy),
383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2),
384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type),
385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port),
387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address),
388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx),
389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress),
390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter),
391};
392
393
394static int verify_address_len(const void *p)
395{
396 const struct sadb_address *sp = p;
397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
398 const struct sockaddr_in *sin;
399#if IS_ENABLED(CONFIG_IPV6)
400 const struct sockaddr_in6 *sin6;
401#endif
402 int len;
403
404 switch (addr->sa_family) {
405 case AF_INET:
406 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
407 if (sp->sadb_address_len != len ||
408 sp->sadb_address_prefixlen > 32)
409 return -EINVAL;
410 break;
411#if IS_ENABLED(CONFIG_IPV6)
412 case AF_INET6:
413 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
414 if (sp->sadb_address_len != len ||
415 sp->sadb_address_prefixlen > 128)
416 return -EINVAL;
417 break;
418#endif
419 default:
420
421
422
423
424
425
426
427
428
429 return -EINVAL;
430 }
431
432 return 0;
433}
434
435static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
436{
437 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
438 sec_ctx->sadb_x_ctx_len,
439 sizeof(uint64_t));
440}
441
442static inline int verify_sec_ctx_len(const void *p)
443{
444 const struct sadb_x_sec_ctx *sec_ctx = p;
445 int len = sec_ctx->sadb_x_ctx_len;
446
447 if (len > PAGE_SIZE)
448 return -EINVAL;
449
450 len = pfkey_sec_ctx_len(sec_ctx);
451
452 if (sec_ctx->sadb_x_sec_len != len)
453 return -EINVAL;
454
455 return 0;
456}
457
458static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
459 gfp_t gfp)
460{
461 struct xfrm_user_sec_ctx *uctx = NULL;
462 int ctx_size = sec_ctx->sadb_x_ctx_len;
463
464 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
465
466 if (!uctx)
467 return NULL;
468
469 uctx->len = pfkey_sec_ctx_len(sec_ctx);
470 uctx->exttype = sec_ctx->sadb_x_sec_exttype;
471 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
472 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
473 uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
474 memcpy(uctx + 1, sec_ctx + 1,
475 uctx->ctx_len);
476
477 return uctx;
478}
479
480static int present_and_same_family(const struct sadb_address *src,
481 const struct sadb_address *dst)
482{
483 const struct sockaddr *s_addr, *d_addr;
484
485 if (!src || !dst)
486 return 0;
487
488 s_addr = (const struct sockaddr *)(src + 1);
489 d_addr = (const struct sockaddr *)(dst + 1);
490 if (s_addr->sa_family != d_addr->sa_family)
491 return 0;
492 if (s_addr->sa_family != AF_INET
493#if IS_ENABLED(CONFIG_IPV6)
494 && s_addr->sa_family != AF_INET6
495#endif
496 )
497 return 0;
498
499 return 1;
500}
501
502static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
503{
504 const char *p = (char *) hdr;
505 int len = skb->len;
506
507 len -= sizeof(*hdr);
508 p += sizeof(*hdr);
509 while (len > 0) {
510 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
511 uint16_t ext_type;
512 int ext_len;
513
514 ext_len = ehdr->sadb_ext_len;
515 ext_len *= sizeof(uint64_t);
516 ext_type = ehdr->sadb_ext_type;
517 if (ext_len < sizeof(uint64_t) ||
518 ext_len > len ||
519 ext_type == SADB_EXT_RESERVED)
520 return -EINVAL;
521
522 if (ext_type <= SADB_EXT_MAX) {
523 int min = (int) sadb_ext_min_len[ext_type];
524 if (ext_len < min)
525 return -EINVAL;
526 if (ext_hdrs[ext_type-1] != NULL)
527 return -EINVAL;
528 if (ext_type == SADB_EXT_ADDRESS_SRC ||
529 ext_type == SADB_EXT_ADDRESS_DST ||
530 ext_type == SADB_EXT_ADDRESS_PROXY ||
531 ext_type == SADB_X_EXT_NAT_T_OA) {
532 if (verify_address_len(p))
533 return -EINVAL;
534 }
535 if (ext_type == SADB_X_EXT_SEC_CTX) {
536 if (verify_sec_ctx_len(p))
537 return -EINVAL;
538 }
539 ext_hdrs[ext_type-1] = (void *) p;
540 }
541 p += ext_len;
542 len -= ext_len;
543 }
544
545 return 0;
546}
547
548static uint16_t
549pfkey_satype2proto(uint8_t satype)
550{
551 switch (satype) {
552 case SADB_SATYPE_UNSPEC:
553 return IPSEC_PROTO_ANY;
554 case SADB_SATYPE_AH:
555 return IPPROTO_AH;
556 case SADB_SATYPE_ESP:
557 return IPPROTO_ESP;
558 case SADB_X_SATYPE_IPCOMP:
559 return IPPROTO_COMP;
560 default:
561 return 0;
562 }
563
564}
565
566static uint8_t
567pfkey_proto2satype(uint16_t proto)
568{
569 switch (proto) {
570 case IPPROTO_AH:
571 return SADB_SATYPE_AH;
572 case IPPROTO_ESP:
573 return SADB_SATYPE_ESP;
574 case IPPROTO_COMP:
575 return SADB_X_SATYPE_IPCOMP;
576 default:
577 return 0;
578 }
579
580}
581
582
583
584
585
586static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
587{
588 return proto == IPSEC_PROTO_ANY ? 0 : proto;
589}
590
591static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
592{
593 return proto ? proto : IPSEC_PROTO_ANY;
594}
595
596static inline int pfkey_sockaddr_len(sa_family_t family)
597{
598 switch (family) {
599 case AF_INET:
600 return sizeof(struct sockaddr_in);
601#if IS_ENABLED(CONFIG_IPV6)
602 case AF_INET6:
603 return sizeof(struct sockaddr_in6);
604#endif
605 }
606 return 0;
607}
608
609static
610int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
611{
612 switch (sa->sa_family) {
613 case AF_INET:
614 xaddr->a4 =
615 ((struct sockaddr_in *)sa)->sin_addr.s_addr;
616 return AF_INET;
617#if IS_ENABLED(CONFIG_IPV6)
618 case AF_INET6:
619 memcpy(xaddr->a6,
620 &((struct sockaddr_in6 *)sa)->sin6_addr,
621 sizeof(struct in6_addr));
622 return AF_INET6;
623#endif
624 }
625 return 0;
626}
627
628static
629int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
630{
631 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
632 xaddr);
633}
634
635static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
636{
637 const struct sadb_sa *sa;
638 const struct sadb_address *addr;
639 uint16_t proto;
640 unsigned short family;
641 xfrm_address_t *xaddr;
642
643 sa = ext_hdrs[SADB_EXT_SA - 1];
644 if (sa == NULL)
645 return NULL;
646
647 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
648 if (proto == 0)
649 return NULL;
650
651
652 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
653 if (addr == NULL)
654 return NULL;
655
656 family = ((const struct sockaddr *)(addr + 1))->sa_family;
657 switch (family) {
658 case AF_INET:
659 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
660 break;
661#if IS_ENABLED(CONFIG_IPV6)
662 case AF_INET6:
663 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
664 break;
665#endif
666 default:
667 xaddr = NULL;
668 }
669
670 if (!xaddr)
671 return NULL;
672
673 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
674}
675
676#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
677
678static int
679pfkey_sockaddr_size(sa_family_t family)
680{
681 return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
682}
683
684static inline int pfkey_mode_from_xfrm(int mode)
685{
686 switch(mode) {
687 case XFRM_MODE_TRANSPORT:
688 return IPSEC_MODE_TRANSPORT;
689 case XFRM_MODE_TUNNEL:
690 return IPSEC_MODE_TUNNEL;
691 case XFRM_MODE_BEET:
692 return IPSEC_MODE_BEET;
693 default:
694 return -1;
695 }
696}
697
698static inline int pfkey_mode_to_xfrm(int mode)
699{
700 switch(mode) {
701 case IPSEC_MODE_ANY:
702 case IPSEC_MODE_TRANSPORT:
703 return XFRM_MODE_TRANSPORT;
704 case IPSEC_MODE_TUNNEL:
705 return XFRM_MODE_TUNNEL;
706 case IPSEC_MODE_BEET:
707 return XFRM_MODE_BEET;
708 default:
709 return -1;
710 }
711}
712
713static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
714 struct sockaddr *sa,
715 unsigned short family)
716{
717 switch (family) {
718 case AF_INET:
719 {
720 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
721 sin->sin_family = AF_INET;
722 sin->sin_port = port;
723 sin->sin_addr.s_addr = xaddr->a4;
724 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
725 return 32;
726 }
727#if IS_ENABLED(CONFIG_IPV6)
728 case AF_INET6:
729 {
730 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
731 sin6->sin6_family = AF_INET6;
732 sin6->sin6_port = port;
733 sin6->sin6_flowinfo = 0;
734 sin6->sin6_addr = xaddr->in6;
735 sin6->sin6_scope_id = 0;
736 return 128;
737 }
738#endif
739 }
740 return 0;
741}
742
743static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
744 int add_keys, int hsc)
745{
746 struct sk_buff *skb;
747 struct sadb_msg *hdr;
748 struct sadb_sa *sa;
749 struct sadb_lifetime *lifetime;
750 struct sadb_address *addr;
751 struct sadb_key *key;
752 struct sadb_x_sa2 *sa2;
753 struct sadb_x_sec_ctx *sec_ctx;
754 struct xfrm_sec_ctx *xfrm_ctx;
755 int ctx_size = 0;
756 int size;
757 int auth_key_size = 0;
758 int encrypt_key_size = 0;
759 int sockaddr_size;
760 struct xfrm_encap_tmpl *natt = NULL;
761 int mode;
762
763
764 sockaddr_size = pfkey_sockaddr_size(x->props.family);
765 if (!sockaddr_size)
766 return ERR_PTR(-EINVAL);
767
768
769
770 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
771 sizeof(struct sadb_lifetime) +
772 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
773 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
774 sizeof(struct sadb_address)*2 +
775 sockaddr_size*2 +
776 sizeof(struct sadb_x_sa2);
777
778 if ((xfrm_ctx = x->security)) {
779 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
780 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
781 }
782
783
784 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
785 size += sizeof(struct sadb_address) + sockaddr_size;
786
787 if (add_keys) {
788 if (x->aalg && x->aalg->alg_key_len) {
789 auth_key_size =
790 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
791 size += sizeof(struct sadb_key) + auth_key_size;
792 }
793 if (x->ealg && x->ealg->alg_key_len) {
794 encrypt_key_size =
795 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
796 size += sizeof(struct sadb_key) + encrypt_key_size;
797 }
798 }
799 if (x->encap)
800 natt = x->encap;
801
802 if (natt && natt->encap_type) {
803 size += sizeof(struct sadb_x_nat_t_type);
804 size += sizeof(struct sadb_x_nat_t_port);
805 size += sizeof(struct sadb_x_nat_t_port);
806 }
807
808 skb = alloc_skb(size + 16, GFP_ATOMIC);
809 if (skb == NULL)
810 return ERR_PTR(-ENOBUFS);
811
812
813 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
814 memset(hdr, 0, size);
815 hdr->sadb_msg_len = size / sizeof(uint64_t);
816
817
818 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
819 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
820 sa->sadb_sa_exttype = SADB_EXT_SA;
821 sa->sadb_sa_spi = x->id.spi;
822 sa->sadb_sa_replay = x->props.replay_window;
823 switch (x->km.state) {
824 case XFRM_STATE_VALID:
825 sa->sadb_sa_state = x->km.dying ?
826 SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
827 break;
828 case XFRM_STATE_ACQ:
829 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
830 break;
831 default:
832 sa->sadb_sa_state = SADB_SASTATE_DEAD;
833 break;
834 }
835 sa->sadb_sa_auth = 0;
836 if (x->aalg) {
837 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
838 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
839 a->desc.sadb_alg_id : 0;
840 }
841 sa->sadb_sa_encrypt = 0;
842 BUG_ON(x->ealg && x->calg);
843 if (x->ealg) {
844 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
845 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
846 a->desc.sadb_alg_id : 0;
847 }
848
849 if (x->calg) {
850 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
851 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
852 a->desc.sadb_alg_id : 0;
853 }
854
855 sa->sadb_sa_flags = 0;
856 if (x->props.flags & XFRM_STATE_NOECN)
857 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
858 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
859 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
860 if (x->props.flags & XFRM_STATE_NOPMTUDISC)
861 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
862
863
864 if (hsc & 2) {
865 lifetime = (struct sadb_lifetime *) skb_put(skb,
866 sizeof(struct sadb_lifetime));
867 lifetime->sadb_lifetime_len =
868 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
869 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
870 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit);
871 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
872 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
873 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
874 }
875
876 if (hsc & 1) {
877 lifetime = (struct sadb_lifetime *) skb_put(skb,
878 sizeof(struct sadb_lifetime));
879 lifetime->sadb_lifetime_len =
880 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
881 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
882 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit);
883 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
884 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
885 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
886 }
887
888 lifetime = (struct sadb_lifetime *) skb_put(skb,
889 sizeof(struct sadb_lifetime));
890 lifetime->sadb_lifetime_len =
891 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
892 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
893 lifetime->sadb_lifetime_allocations = x->curlft.packets;
894 lifetime->sadb_lifetime_bytes = x->curlft.bytes;
895 lifetime->sadb_lifetime_addtime = x->curlft.add_time;
896 lifetime->sadb_lifetime_usetime = x->curlft.use_time;
897
898 addr = (struct sadb_address*) skb_put(skb,
899 sizeof(struct sadb_address)+sockaddr_size);
900 addr->sadb_address_len =
901 (sizeof(struct sadb_address)+sockaddr_size)/
902 sizeof(uint64_t);
903 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
904
905
906
907 addr->sadb_address_proto = 0;
908 addr->sadb_address_reserved = 0;
909
910 addr->sadb_address_prefixlen =
911 pfkey_sockaddr_fill(&x->props.saddr, 0,
912 (struct sockaddr *) (addr + 1),
913 x->props.family);
914 if (!addr->sadb_address_prefixlen)
915 BUG();
916
917
918 addr = (struct sadb_address*) skb_put(skb,
919 sizeof(struct sadb_address)+sockaddr_size);
920 addr->sadb_address_len =
921 (sizeof(struct sadb_address)+sockaddr_size)/
922 sizeof(uint64_t);
923 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
924 addr->sadb_address_proto = 0;
925 addr->sadb_address_reserved = 0;
926
927 addr->sadb_address_prefixlen =
928 pfkey_sockaddr_fill(&x->id.daddr, 0,
929 (struct sockaddr *) (addr + 1),
930 x->props.family);
931 if (!addr->sadb_address_prefixlen)
932 BUG();
933
934 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
935 x->props.family)) {
936 addr = (struct sadb_address*) skb_put(skb,
937 sizeof(struct sadb_address)+sockaddr_size);
938 addr->sadb_address_len =
939 (sizeof(struct sadb_address)+sockaddr_size)/
940 sizeof(uint64_t);
941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
942 addr->sadb_address_proto =
943 pfkey_proto_from_xfrm(x->sel.proto);
944 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
945 addr->sadb_address_reserved = 0;
946
947 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
948 (struct sockaddr *) (addr + 1),
949 x->props.family);
950 }
951
952
953 if (add_keys && auth_key_size) {
954 key = (struct sadb_key *) skb_put(skb,
955 sizeof(struct sadb_key)+auth_key_size);
956 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
957 sizeof(uint64_t);
958 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
959 key->sadb_key_bits = x->aalg->alg_key_len;
960 key->sadb_key_reserved = 0;
961 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
962 }
963
964 if (add_keys && encrypt_key_size) {
965 key = (struct sadb_key *) skb_put(skb,
966 sizeof(struct sadb_key)+encrypt_key_size);
967 key->sadb_key_len = (sizeof(struct sadb_key) +
968 encrypt_key_size) / sizeof(uint64_t);
969 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
970 key->sadb_key_bits = x->ealg->alg_key_len;
971 key->sadb_key_reserved = 0;
972 memcpy(key + 1, x->ealg->alg_key,
973 (x->ealg->alg_key_len+7)/8);
974 }
975
976
977 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2));
978 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
979 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
980 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
981 kfree_skb(skb);
982 return ERR_PTR(-EINVAL);
983 }
984 sa2->sadb_x_sa2_mode = mode;
985 sa2->sadb_x_sa2_reserved1 = 0;
986 sa2->sadb_x_sa2_reserved2 = 0;
987 sa2->sadb_x_sa2_sequence = 0;
988 sa2->sadb_x_sa2_reqid = x->props.reqid;
989
990 if (natt && natt->encap_type) {
991 struct sadb_x_nat_t_type *n_type;
992 struct sadb_x_nat_t_port *n_port;
993
994
995 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
996 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
997 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
998 n_type->sadb_x_nat_t_type_type = natt->encap_type;
999 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1000 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1001 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1002
1003
1004 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1005 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1006 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1007 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1008 n_port->sadb_x_nat_t_port_reserved = 0;
1009
1010
1011 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1012 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1013 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1014 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1015 n_port->sadb_x_nat_t_port_reserved = 0;
1016 }
1017
1018
1019 if (xfrm_ctx) {
1020 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1021 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1022 sec_ctx->sadb_x_sec_len =
1023 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1024 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1025 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1026 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1027 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1028 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1029 xfrm_ctx->ctx_len);
1030 }
1031
1032 return skb;
1033}
1034
1035
1036static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1037{
1038 struct sk_buff *skb;
1039
1040 skb = __pfkey_xfrm_state2msg(x, 1, 3);
1041
1042 return skb;
1043}
1044
1045static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1046 int hsc)
1047{
1048 return __pfkey_xfrm_state2msg(x, 0, hsc);
1049}
1050
1051static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1052 const struct sadb_msg *hdr,
1053 void * const *ext_hdrs)
1054{
1055 struct xfrm_state *x;
1056 const struct sadb_lifetime *lifetime;
1057 const struct sadb_sa *sa;
1058 const struct sadb_key *key;
1059 const struct sadb_x_sec_ctx *sec_ctx;
1060 uint16_t proto;
1061 int err;
1062
1063
1064 sa = ext_hdrs[SADB_EXT_SA - 1];
1065 if (!sa ||
1066 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1067 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1068 return ERR_PTR(-EINVAL);
1069 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1070 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1071 return ERR_PTR(-EINVAL);
1072 if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1073 !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1074 return ERR_PTR(-EINVAL);
1075 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1076 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1077 return ERR_PTR(-EINVAL);
1078
1079 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1080 if (proto == 0)
1081 return ERR_PTR(-EINVAL);
1082
1083
1084 err = -ENOBUFS;
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098 if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1099 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1100 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1101 sa->sadb_sa_encrypt > SADB_EALG_MAX)
1102 return ERR_PTR(-EINVAL);
1103 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1104 if (key != NULL &&
1105 sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1106 ((key->sadb_key_bits+7) / 8 == 0 ||
1107 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1108 return ERR_PTR(-EINVAL);
1109 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1110 if (key != NULL &&
1111 sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1112 ((key->sadb_key_bits+7) / 8 == 0 ||
1113 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1114 return ERR_PTR(-EINVAL);
1115
1116 x = xfrm_state_alloc(net);
1117 if (x == NULL)
1118 return ERR_PTR(-ENOBUFS);
1119
1120 x->id.proto = proto;
1121 x->id.spi = sa->sadb_sa_spi;
1122 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1123 (sizeof(x->replay.bitmap) * 8));
1124 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1125 x->props.flags |= XFRM_STATE_NOECN;
1126 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1127 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1128 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1129 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1130
1131 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1132 if (lifetime != NULL) {
1133 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1134 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1135 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1136 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1137 }
1138 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1139 if (lifetime != NULL) {
1140 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1141 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1142 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1143 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1144 }
1145
1146 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1147 if (sec_ctx != NULL) {
1148 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1149
1150 if (!uctx)
1151 goto out;
1152
1153 err = security_xfrm_state_alloc(x, uctx);
1154 kfree(uctx);
1155
1156 if (err)
1157 goto out;
1158 }
1159
1160 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1161 if (sa->sadb_sa_auth) {
1162 int keysize = 0;
1163 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1164 if (!a || !a->pfkey_supported) {
1165 err = -ENOSYS;
1166 goto out;
1167 }
1168 if (key)
1169 keysize = (key->sadb_key_bits + 7) / 8;
1170 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1171 if (!x->aalg)
1172 goto out;
1173 strcpy(x->aalg->alg_name, a->name);
1174 x->aalg->alg_key_len = 0;
1175 if (key) {
1176 x->aalg->alg_key_len = key->sadb_key_bits;
1177 memcpy(x->aalg->alg_key, key+1, keysize);
1178 }
1179 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1180 x->props.aalgo = sa->sadb_sa_auth;
1181
1182 }
1183 if (sa->sadb_sa_encrypt) {
1184 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1185 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1186 if (!a || !a->pfkey_supported) {
1187 err = -ENOSYS;
1188 goto out;
1189 }
1190 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1191 if (!x->calg)
1192 goto out;
1193 strcpy(x->calg->alg_name, a->name);
1194 x->props.calgo = sa->sadb_sa_encrypt;
1195 } else {
1196 int keysize = 0;
1197 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1198 if (!a || !a->pfkey_supported) {
1199 err = -ENOSYS;
1200 goto out;
1201 }
1202 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1203 if (key)
1204 keysize = (key->sadb_key_bits + 7) / 8;
1205 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1206 if (!x->ealg)
1207 goto out;
1208 strcpy(x->ealg->alg_name, a->name);
1209 x->ealg->alg_key_len = 0;
1210 if (key) {
1211 x->ealg->alg_key_len = key->sadb_key_bits;
1212 memcpy(x->ealg->alg_key, key+1, keysize);
1213 }
1214 x->props.ealgo = sa->sadb_sa_encrypt;
1215 x->geniv = a->uinfo.encr.geniv;
1216 }
1217 }
1218
1219
1220 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1221 &x->props.saddr);
1222 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1223 &x->id.daddr);
1224
1225 if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1226 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1227 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1228 if (mode < 0) {
1229 err = -EINVAL;
1230 goto out;
1231 }
1232 x->props.mode = mode;
1233 x->props.reqid = sa2->sadb_x_sa2_reqid;
1234 }
1235
1236 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1237 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1238
1239
1240 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1241 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1242 }
1243
1244 if (!x->sel.family)
1245 x->sel.family = x->props.family;
1246
1247 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1248 const struct sadb_x_nat_t_type* n_type;
1249 struct xfrm_encap_tmpl *natt;
1250
1251 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1252 if (!x->encap)
1253 goto out;
1254
1255 natt = x->encap;
1256 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1257 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1258
1259 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1260 const struct sadb_x_nat_t_port *n_port =
1261 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1262 natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1263 }
1264 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1265 const struct sadb_x_nat_t_port *n_port =
1266 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1267 natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1268 }
1269 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1270 }
1271
1272 err = xfrm_init_state(x);
1273 if (err)
1274 goto out;
1275
1276 x->km.seq = hdr->sadb_msg_seq;
1277 return x;
1278
1279out:
1280 x->km.state = XFRM_STATE_DEAD;
1281 xfrm_state_put(x);
1282 return ERR_PTR(err);
1283}
1284
1285static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1286{
1287 return -EOPNOTSUPP;
1288}
1289
1290static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1291{
1292 struct net *net = sock_net(sk);
1293 struct sk_buff *resp_skb;
1294 struct sadb_x_sa2 *sa2;
1295 struct sadb_address *saddr, *daddr;
1296 struct sadb_msg *out_hdr;
1297 struct sadb_spirange *range;
1298 struct xfrm_state *x = NULL;
1299 int mode;
1300 int err;
1301 u32 min_spi, max_spi;
1302 u32 reqid;
1303 u8 proto;
1304 unsigned short family;
1305 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1306
1307 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1308 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1309 return -EINVAL;
1310
1311 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1312 if (proto == 0)
1313 return -EINVAL;
1314
1315 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1316 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1317 if (mode < 0)
1318 return -EINVAL;
1319 reqid = sa2->sadb_x_sa2_reqid;
1320 } else {
1321 mode = 0;
1322 reqid = 0;
1323 }
1324
1325 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1326 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1327
1328 family = ((struct sockaddr *)(saddr + 1))->sa_family;
1329 switch (family) {
1330 case AF_INET:
1331 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1332 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1333 break;
1334#if IS_ENABLED(CONFIG_IPV6)
1335 case AF_INET6:
1336 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1337 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1338 break;
1339#endif
1340 }
1341
1342 if (hdr->sadb_msg_seq) {
1343 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1344 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1345 xfrm_state_put(x);
1346 x = NULL;
1347 }
1348 }
1349
1350 if (!x)
1351 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1352
1353 if (x == NULL)
1354 return -ENOENT;
1355
1356 min_spi = 0x100;
1357 max_spi = 0x0fffffff;
1358
1359 range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1360 if (range) {
1361 min_spi = range->sadb_spirange_min;
1362 max_spi = range->sadb_spirange_max;
1363 }
1364
1365 err = verify_spi_info(x->id.proto, min_spi, max_spi);
1366 if (err) {
1367 xfrm_state_put(x);
1368 return err;
1369 }
1370
1371 err = xfrm_alloc_spi(x, min_spi, max_spi);
1372 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1373
1374 if (IS_ERR(resp_skb)) {
1375 xfrm_state_put(x);
1376 return PTR_ERR(resp_skb);
1377 }
1378
1379 out_hdr = (struct sadb_msg *) resp_skb->data;
1380 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1381 out_hdr->sadb_msg_type = SADB_GETSPI;
1382 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1383 out_hdr->sadb_msg_errno = 0;
1384 out_hdr->sadb_msg_reserved = 0;
1385 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1386 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1387
1388 xfrm_state_put(x);
1389
1390 pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1391
1392 return 0;
1393}
1394
1395static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1396{
1397 struct net *net = sock_net(sk);
1398 struct xfrm_state *x;
1399
1400 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1401 return -EOPNOTSUPP;
1402
1403 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1404 return 0;
1405
1406 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1407 if (x == NULL)
1408 return 0;
1409
1410 spin_lock_bh(&x->lock);
1411 if (x->km.state == XFRM_STATE_ACQ)
1412 x->km.state = XFRM_STATE_ERROR;
1413
1414 spin_unlock_bh(&x->lock);
1415 xfrm_state_put(x);
1416 return 0;
1417}
1418
1419static inline int event2poltype(int event)
1420{
1421 switch (event) {
1422 case XFRM_MSG_DELPOLICY:
1423 return SADB_X_SPDDELETE;
1424 case XFRM_MSG_NEWPOLICY:
1425 return SADB_X_SPDADD;
1426 case XFRM_MSG_UPDPOLICY:
1427 return SADB_X_SPDUPDATE;
1428 case XFRM_MSG_POLEXPIRE:
1429
1430 default:
1431 pr_err("pfkey: Unknown policy event %d\n", event);
1432 break;
1433 }
1434
1435 return 0;
1436}
1437
1438static inline int event2keytype(int event)
1439{
1440 switch (event) {
1441 case XFRM_MSG_DELSA:
1442 return SADB_DELETE;
1443 case XFRM_MSG_NEWSA:
1444 return SADB_ADD;
1445 case XFRM_MSG_UPDSA:
1446 return SADB_UPDATE;
1447 case XFRM_MSG_EXPIRE:
1448 return SADB_EXPIRE;
1449 default:
1450 pr_err("pfkey: Unknown SA event %d\n", event);
1451 break;
1452 }
1453
1454 return 0;
1455}
1456
1457
1458static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1459{
1460 struct sk_buff *skb;
1461 struct sadb_msg *hdr;
1462
1463 skb = pfkey_xfrm_state2msg(x);
1464
1465 if (IS_ERR(skb))
1466 return PTR_ERR(skb);
1467
1468 hdr = (struct sadb_msg *) skb->data;
1469 hdr->sadb_msg_version = PF_KEY_V2;
1470 hdr->sadb_msg_type = event2keytype(c->event);
1471 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1472 hdr->sadb_msg_errno = 0;
1473 hdr->sadb_msg_reserved = 0;
1474 hdr->sadb_msg_seq = c->seq;
1475 hdr->sadb_msg_pid = c->portid;
1476
1477 pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1478
1479 return 0;
1480}
1481
1482static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1483{
1484 struct net *net = sock_net(sk);
1485 struct xfrm_state *x;
1486 int err;
1487 struct km_event c;
1488
1489 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1490 if (IS_ERR(x))
1491 return PTR_ERR(x);
1492
1493 xfrm_state_hold(x);
1494 if (hdr->sadb_msg_type == SADB_ADD)
1495 err = xfrm_state_add(x);
1496 else
1497 err = xfrm_state_update(x);
1498
1499 xfrm_audit_state_add(x, err ? 0 : 1, true);
1500
1501 if (err < 0) {
1502 x->km.state = XFRM_STATE_DEAD;
1503 __xfrm_state_put(x);
1504 goto out;
1505 }
1506
1507 if (hdr->sadb_msg_type == SADB_ADD)
1508 c.event = XFRM_MSG_NEWSA;
1509 else
1510 c.event = XFRM_MSG_UPDSA;
1511 c.seq = hdr->sadb_msg_seq;
1512 c.portid = hdr->sadb_msg_pid;
1513 km_state_notify(x, &c);
1514out:
1515 xfrm_state_put(x);
1516 return err;
1517}
1518
1519static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1520{
1521 struct net *net = sock_net(sk);
1522 struct xfrm_state *x;
1523 struct km_event c;
1524 int err;
1525
1526 if (!ext_hdrs[SADB_EXT_SA-1] ||
1527 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1528 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1529 return -EINVAL;
1530
1531 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1532 if (x == NULL)
1533 return -ESRCH;
1534
1535 if ((err = security_xfrm_state_delete(x)))
1536 goto out;
1537
1538 if (xfrm_state_kern(x)) {
1539 err = -EPERM;
1540 goto out;
1541 }
1542
1543 err = xfrm_state_delete(x);
1544
1545 if (err < 0)
1546 goto out;
1547
1548 c.seq = hdr->sadb_msg_seq;
1549 c.portid = hdr->sadb_msg_pid;
1550 c.event = XFRM_MSG_DELSA;
1551 km_state_notify(x, &c);
1552out:
1553 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1554 xfrm_state_put(x);
1555
1556 return err;
1557}
1558
1559static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1560{
1561 struct net *net = sock_net(sk);
1562 __u8 proto;
1563 struct sk_buff *out_skb;
1564 struct sadb_msg *out_hdr;
1565 struct xfrm_state *x;
1566
1567 if (!ext_hdrs[SADB_EXT_SA-1] ||
1568 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1569 ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1570 return -EINVAL;
1571
1572 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1573 if (x == NULL)
1574 return -ESRCH;
1575
1576 out_skb = pfkey_xfrm_state2msg(x);
1577 proto = x->id.proto;
1578 xfrm_state_put(x);
1579 if (IS_ERR(out_skb))
1580 return PTR_ERR(out_skb);
1581
1582 out_hdr = (struct sadb_msg *) out_skb->data;
1583 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1584 out_hdr->sadb_msg_type = SADB_GET;
1585 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1586 out_hdr->sadb_msg_errno = 0;
1587 out_hdr->sadb_msg_reserved = 0;
1588 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1589 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1590 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1591
1592 return 0;
1593}
1594
1595static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1596 gfp_t allocation)
1597{
1598 struct sk_buff *skb;
1599 struct sadb_msg *hdr;
1600 int len, auth_len, enc_len, i;
1601
1602 auth_len = xfrm_count_pfkey_auth_supported();
1603 if (auth_len) {
1604 auth_len *= sizeof(struct sadb_alg);
1605 auth_len += sizeof(struct sadb_supported);
1606 }
1607
1608 enc_len = xfrm_count_pfkey_enc_supported();
1609 if (enc_len) {
1610 enc_len *= sizeof(struct sadb_alg);
1611 enc_len += sizeof(struct sadb_supported);
1612 }
1613
1614 len = enc_len + auth_len + sizeof(struct sadb_msg);
1615
1616 skb = alloc_skb(len + 16, allocation);
1617 if (!skb)
1618 goto out_put_algs;
1619
1620 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1621 pfkey_hdr_dup(hdr, orig);
1622 hdr->sadb_msg_errno = 0;
1623 hdr->sadb_msg_len = len / sizeof(uint64_t);
1624
1625 if (auth_len) {
1626 struct sadb_supported *sp;
1627 struct sadb_alg *ap;
1628
1629 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1630 ap = (struct sadb_alg *) (sp + 1);
1631
1632 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1633 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1634
1635 for (i = 0; ; i++) {
1636 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1637 if (!aalg)
1638 break;
1639 if (!aalg->pfkey_supported)
1640 continue;
1641 if (aalg->available)
1642 *ap++ = aalg->desc;
1643 }
1644 }
1645
1646 if (enc_len) {
1647 struct sadb_supported *sp;
1648 struct sadb_alg *ap;
1649
1650 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1651 ap = (struct sadb_alg *) (sp + 1);
1652
1653 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1654 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1655
1656 for (i = 0; ; i++) {
1657 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1658 if (!ealg)
1659 break;
1660 if (!ealg->pfkey_supported)
1661 continue;
1662 if (ealg->available)
1663 *ap++ = ealg->desc;
1664 }
1665 }
1666
1667out_put_algs:
1668 return skb;
1669}
1670
1671static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1672{
1673 struct pfkey_sock *pfk = pfkey_sk(sk);
1674 struct sk_buff *supp_skb;
1675
1676 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1677 return -EINVAL;
1678
1679 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1680 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1681 return -EEXIST;
1682 pfk->registered |= (1<<hdr->sadb_msg_satype);
1683 }
1684
1685 xfrm_probe_algs();
1686
1687 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1688 if (!supp_skb) {
1689 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1690 pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1691
1692 return -ENOBUFS;
1693 }
1694
1695 pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1696
1697 return 0;
1698}
1699
1700static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1701{
1702 struct sk_buff *skb;
1703 struct sadb_msg *hdr;
1704
1705 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1706 if (!skb)
1707 return -ENOBUFS;
1708
1709 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1710 memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1711 hdr->sadb_msg_errno = (uint8_t) 0;
1712 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713
1714 return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1715}
1716
1717static int key_notify_sa_flush(const struct km_event *c)
1718{
1719 struct sk_buff *skb;
1720 struct sadb_msg *hdr;
1721
1722 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1723 if (!skb)
1724 return -ENOBUFS;
1725 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1726 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1727 hdr->sadb_msg_type = SADB_FLUSH;
1728 hdr->sadb_msg_seq = c->seq;
1729 hdr->sadb_msg_pid = c->portid;
1730 hdr->sadb_msg_version = PF_KEY_V2;
1731 hdr->sadb_msg_errno = (uint8_t) 0;
1732 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1733 hdr->sadb_msg_reserved = 0;
1734
1735 pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1736
1737 return 0;
1738}
1739
1740static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1741{
1742 struct net *net = sock_net(sk);
1743 unsigned int proto;
1744 struct km_event c;
1745 int err, err2;
1746
1747 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1748 if (proto == 0)
1749 return -EINVAL;
1750
1751 err = xfrm_state_flush(net, proto, true);
1752 err2 = unicast_flush_resp(sk, hdr);
1753 if (err || err2) {
1754 if (err == -ESRCH)
1755 err = 0;
1756 return err ? err : err2;
1757 }
1758
1759 c.data.proto = proto;
1760 c.seq = hdr->sadb_msg_seq;
1761 c.portid = hdr->sadb_msg_pid;
1762 c.event = XFRM_MSG_FLUSHSA;
1763 c.net = net;
1764 km_state_notify(NULL, &c);
1765
1766 return 0;
1767}
1768
1769static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1770{
1771 struct pfkey_sock *pfk = ptr;
1772 struct sk_buff *out_skb;
1773 struct sadb_msg *out_hdr;
1774
1775 if (!pfkey_can_dump(&pfk->sk))
1776 return -ENOBUFS;
1777
1778 out_skb = pfkey_xfrm_state2msg(x);
1779 if (IS_ERR(out_skb))
1780 return PTR_ERR(out_skb);
1781
1782 out_hdr = (struct sadb_msg *) out_skb->data;
1783 out_hdr->sadb_msg_version = pfk->dump.msg_version;
1784 out_hdr->sadb_msg_type = SADB_DUMP;
1785 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1786 out_hdr->sadb_msg_errno = 0;
1787 out_hdr->sadb_msg_reserved = 0;
1788 out_hdr->sadb_msg_seq = count + 1;
1789 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1790
1791 if (pfk->dump.skb)
1792 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1793 &pfk->sk, sock_net(&pfk->sk));
1794 pfk->dump.skb = out_skb;
1795
1796 return 0;
1797}
1798
1799static int pfkey_dump_sa(struct pfkey_sock *pfk)
1800{
1801 struct net *net = sock_net(&pfk->sk);
1802 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1803}
1804
1805static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1806{
1807 struct net *net = sock_net(&pfk->sk);
1808
1809 xfrm_state_walk_done(&pfk->dump.u.state, net);
1810}
1811
1812static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1813{
1814 u8 proto;
1815 struct xfrm_address_filter *filter = NULL;
1816 struct pfkey_sock *pfk = pfkey_sk(sk);
1817
1818 mutex_lock(&pfk->dump_lock);
1819 if (pfk->dump.dump != NULL) {
1820 mutex_unlock(&pfk->dump_lock);
1821 return -EBUSY;
1822 }
1823
1824 proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1825 if (proto == 0) {
1826 mutex_unlock(&pfk->dump_lock);
1827 return -EINVAL;
1828 }
1829
1830 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1831 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1832
1833 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1834 if (filter == NULL) {
1835 mutex_unlock(&pfk->dump_lock);
1836 return -ENOMEM;
1837 }
1838
1839 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1840 sizeof(xfrm_address_t));
1841 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1842 sizeof(xfrm_address_t));
1843 filter->family = xfilter->sadb_x_filter_family;
1844 filter->splen = xfilter->sadb_x_filter_splen;
1845 filter->dplen = xfilter->sadb_x_filter_dplen;
1846 }
1847
1848 pfk->dump.msg_version = hdr->sadb_msg_version;
1849 pfk->dump.msg_portid = hdr->sadb_msg_pid;
1850 pfk->dump.dump = pfkey_dump_sa;
1851 pfk->dump.done = pfkey_dump_sa_done;
1852 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1853 mutex_unlock(&pfk->dump_lock);
1854
1855 return pfkey_do_dump(pfk);
1856}
1857
1858static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1859{
1860 struct pfkey_sock *pfk = pfkey_sk(sk);
1861 int satype = hdr->sadb_msg_satype;
1862 bool reset_errno = false;
1863
1864 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1865 reset_errno = true;
1866 if (satype != 0 && satype != 1)
1867 return -EINVAL;
1868 pfk->promisc = satype;
1869 }
1870 if (reset_errno && skb_cloned(skb))
1871 skb = skb_copy(skb, GFP_KERNEL);
1872 else
1873 skb = skb_clone(skb, GFP_KERNEL);
1874
1875 if (reset_errno && skb) {
1876 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1877 new_hdr->sadb_msg_errno = 0;
1878 }
1879
1880 pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1881 return 0;
1882}
1883
1884static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1885{
1886 int i;
1887 u32 reqid = *(u32*)ptr;
1888
1889 for (i=0; i<xp->xfrm_nr; i++) {
1890 if (xp->xfrm_vec[i].reqid == reqid)
1891 return -EEXIST;
1892 }
1893 return 0;
1894}
1895
1896static u32 gen_reqid(struct net *net)
1897{
1898 struct xfrm_policy_walk walk;
1899 u32 start;
1900 int rc;
1901 static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1902
1903 start = reqid;
1904 do {
1905 ++reqid;
1906 if (reqid == 0)
1907 reqid = IPSEC_MANUAL_REQID_MAX+1;
1908 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1909 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1910 xfrm_policy_walk_done(&walk, net);
1911 if (rc != -EEXIST)
1912 return reqid;
1913 } while (reqid != start);
1914 return 0;
1915}
1916
1917static int
1918parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1919{
1920 struct net *net = xp_net(xp);
1921 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1922 int mode;
1923
1924 if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1925 return -ELOOP;
1926
1927 if (rq->sadb_x_ipsecrequest_mode == 0)
1928 return -EINVAL;
1929
1930 t->id.proto = rq->sadb_x_ipsecrequest_proto;
1931 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1932 return -EINVAL;
1933 t->mode = mode;
1934 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1935 t->optional = 1;
1936 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1937 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1938 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1939 t->reqid = 0;
1940 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1941 return -ENOBUFS;
1942 }
1943
1944
1945 if (t->mode == XFRM_MODE_TUNNEL) {
1946 int err;
1947
1948 err = parse_sockaddr_pair(
1949 (struct sockaddr *)(rq + 1),
1950 rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1951 &t->saddr, &t->id.daddr, &t->encap_family);
1952 if (err)
1953 return err;
1954 } else
1955 t->encap_family = xp->family;
1956
1957
1958 t->allalgs = 1;
1959 xp->xfrm_nr++;
1960 return 0;
1961}
1962
1963static int
1964parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1965{
1966 int err;
1967 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1968 struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1969
1970 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1971 return -EINVAL;
1972
1973 while (len >= sizeof(*rq)) {
1974 if (len < rq->sadb_x_ipsecrequest_len ||
1975 rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1976 return -EINVAL;
1977
1978 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1979 return err;
1980 len -= rq->sadb_x_ipsecrequest_len;
1981 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1982 }
1983 return 0;
1984}
1985
1986static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1987{
1988 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1989
1990 if (xfrm_ctx) {
1991 int len = sizeof(struct sadb_x_sec_ctx);
1992 len += xfrm_ctx->ctx_len;
1993 return PFKEY_ALIGN8(len);
1994 }
1995 return 0;
1996}
1997
1998static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1999{
2000 const struct xfrm_tmpl *t;
2001 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2002 int socklen = 0;
2003 int i;
2004
2005 for (i=0; i<xp->xfrm_nr; i++) {
2006 t = xp->xfrm_vec + i;
2007 socklen += pfkey_sockaddr_len(t->encap_family);
2008 }
2009
2010 return sizeof(struct sadb_msg) +
2011 (sizeof(struct sadb_lifetime) * 3) +
2012 (sizeof(struct sadb_address) * 2) +
2013 (sockaddr_size * 2) +
2014 sizeof(struct sadb_x_policy) +
2015 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2016 (socklen * 2) +
2017 pfkey_xfrm_policy2sec_ctx_size(xp);
2018}
2019
2020static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2021{
2022 struct sk_buff *skb;
2023 int size;
2024
2025 size = pfkey_xfrm_policy2msg_size(xp);
2026
2027 skb = alloc_skb(size + 16, GFP_ATOMIC);
2028 if (skb == NULL)
2029 return ERR_PTR(-ENOBUFS);
2030
2031 return skb;
2032}
2033
2034static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2035{
2036 struct sadb_msg *hdr;
2037 struct sadb_address *addr;
2038 struct sadb_lifetime *lifetime;
2039 struct sadb_x_policy *pol;
2040 struct sadb_x_sec_ctx *sec_ctx;
2041 struct xfrm_sec_ctx *xfrm_ctx;
2042 int i;
2043 int size;
2044 int sockaddr_size = pfkey_sockaddr_size(xp->family);
2045 int socklen = pfkey_sockaddr_len(xp->family);
2046
2047 size = pfkey_xfrm_policy2msg_size(xp);
2048
2049
2050 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2051 memset(hdr, 0, size);
2052
2053
2054 addr = (struct sadb_address*) skb_put(skb,
2055 sizeof(struct sadb_address)+sockaddr_size);
2056 addr->sadb_address_len =
2057 (sizeof(struct sadb_address)+sockaddr_size)/
2058 sizeof(uint64_t);
2059 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2060 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2061 addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2062 addr->sadb_address_reserved = 0;
2063 if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2064 xp->selector.sport,
2065 (struct sockaddr *) (addr + 1),
2066 xp->family))
2067 BUG();
2068
2069
2070 addr = (struct sadb_address*) skb_put(skb,
2071 sizeof(struct sadb_address)+sockaddr_size);
2072 addr->sadb_address_len =
2073 (sizeof(struct sadb_address)+sockaddr_size)/
2074 sizeof(uint64_t);
2075 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2076 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2077 addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2078 addr->sadb_address_reserved = 0;
2079
2080 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2081 (struct sockaddr *) (addr + 1),
2082 xp->family);
2083
2084
2085 lifetime = (struct sadb_lifetime *) skb_put(skb,
2086 sizeof(struct sadb_lifetime));
2087 lifetime->sadb_lifetime_len =
2088 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2089 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2090 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit);
2091 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2092 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2093 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2094
2095 lifetime = (struct sadb_lifetime *) skb_put(skb,
2096 sizeof(struct sadb_lifetime));
2097 lifetime->sadb_lifetime_len =
2098 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2099 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2100 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit);
2101 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2102 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2103 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2104
2105 lifetime = (struct sadb_lifetime *) skb_put(skb,
2106 sizeof(struct sadb_lifetime));
2107 lifetime->sadb_lifetime_len =
2108 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2109 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2110 lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2111 lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2112 lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2113 lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2114
2115 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
2116 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2117 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2118 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2119 if (xp->action == XFRM_POLICY_ALLOW) {
2120 if (xp->xfrm_nr)
2121 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2122 else
2123 pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2124 }
2125 pol->sadb_x_policy_dir = dir+1;
2126 pol->sadb_x_policy_reserved = 0;
2127 pol->sadb_x_policy_id = xp->index;
2128 pol->sadb_x_policy_priority = xp->priority;
2129
2130 for (i=0; i<xp->xfrm_nr; i++) {
2131 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2132 struct sadb_x_ipsecrequest *rq;
2133 int req_size;
2134 int mode;
2135
2136 req_size = sizeof(struct sadb_x_ipsecrequest);
2137 if (t->mode == XFRM_MODE_TUNNEL) {
2138 socklen = pfkey_sockaddr_len(t->encap_family);
2139 req_size += socklen * 2;
2140 } else {
2141 size -= 2*socklen;
2142 }
2143 rq = (void*)skb_put(skb, req_size);
2144 pol->sadb_x_policy_len += req_size/8;
2145 memset(rq, 0, sizeof(*rq));
2146 rq->sadb_x_ipsecrequest_len = req_size;
2147 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2148 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2149 return -EINVAL;
2150 rq->sadb_x_ipsecrequest_mode = mode;
2151 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2152 if (t->reqid)
2153 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2154 if (t->optional)
2155 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2156 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2157
2158 if (t->mode == XFRM_MODE_TUNNEL) {
2159 u8 *sa = (void *)(rq + 1);
2160 pfkey_sockaddr_fill(&t->saddr, 0,
2161 (struct sockaddr *)sa,
2162 t->encap_family);
2163 pfkey_sockaddr_fill(&t->id.daddr, 0,
2164 (struct sockaddr *) (sa + socklen),
2165 t->encap_family);
2166 }
2167 }
2168
2169
2170 if ((xfrm_ctx = xp->security)) {
2171 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2172
2173 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2174 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2175 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2176 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2177 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2178 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2179 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2180 xfrm_ctx->ctx_len);
2181 }
2182
2183 hdr->sadb_msg_len = size / sizeof(uint64_t);
2184 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2185
2186 return 0;
2187}
2188
2189static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2190{
2191 struct sk_buff *out_skb;
2192 struct sadb_msg *out_hdr;
2193 int err;
2194
2195 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2196 if (IS_ERR(out_skb))
2197 return PTR_ERR(out_skb);
2198
2199 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2200 if (err < 0)
2201 return err;
2202
2203 out_hdr = (struct sadb_msg *) out_skb->data;
2204 out_hdr->sadb_msg_version = PF_KEY_V2;
2205
2206 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2207 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2208 else
2209 out_hdr->sadb_msg_type = event2poltype(c->event);
2210 out_hdr->sadb_msg_errno = 0;
2211 out_hdr->sadb_msg_seq = c->seq;
2212 out_hdr->sadb_msg_pid = c->portid;
2213 pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2214 return 0;
2215
2216}
2217
2218static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2219{
2220 struct net *net = sock_net(sk);
2221 int err = 0;
2222 struct sadb_lifetime *lifetime;
2223 struct sadb_address *sa;
2224 struct sadb_x_policy *pol;
2225 struct xfrm_policy *xp;
2226 struct km_event c;
2227 struct sadb_x_sec_ctx *sec_ctx;
2228
2229 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2230 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2231 !ext_hdrs[SADB_X_EXT_POLICY-1])
2232 return -EINVAL;
2233
2234 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2235 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2236 return -EINVAL;
2237 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2238 return -EINVAL;
2239
2240 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2241 if (xp == NULL)
2242 return -ENOBUFS;
2243
2244 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2245 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2246 xp->priority = pol->sadb_x_policy_priority;
2247
2248 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2249 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2250 xp->selector.family = xp->family;
2251 xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2252 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2253 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2254 if (xp->selector.sport)
2255 xp->selector.sport_mask = htons(0xffff);
2256
2257 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2258 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2259 xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2260
2261
2262
2263
2264 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2265
2266 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2267 if (xp->selector.dport)
2268 xp->selector.dport_mask = htons(0xffff);
2269
2270 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2271 if (sec_ctx != NULL) {
2272 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2273
2274 if (!uctx) {
2275 err = -ENOBUFS;
2276 goto out;
2277 }
2278
2279 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2280 kfree(uctx);
2281
2282 if (err)
2283 goto out;
2284 }
2285
2286 xp->lft.soft_byte_limit = XFRM_INF;
2287 xp->lft.hard_byte_limit = XFRM_INF;
2288 xp->lft.soft_packet_limit = XFRM_INF;
2289 xp->lft.hard_packet_limit = XFRM_INF;
2290 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2291 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2292 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2293 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2294 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2295 }
2296 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2297 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2298 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2299 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2300 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2301 }
2302 xp->xfrm_nr = 0;
2303 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2304 (err = parse_ipsecrequests(xp, pol)) < 0)
2305 goto out;
2306
2307 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2308 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2309
2310 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2311
2312 if (err)
2313 goto out;
2314
2315 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2316 c.event = XFRM_MSG_UPDPOLICY;
2317 else
2318 c.event = XFRM_MSG_NEWPOLICY;
2319
2320 c.seq = hdr->sadb_msg_seq;
2321 c.portid = hdr->sadb_msg_pid;
2322
2323 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2324 xfrm_pol_put(xp);
2325 return 0;
2326
2327out:
2328 xp->walk.dead = 1;
2329 xfrm_policy_destroy(xp);
2330 return err;
2331}
2332
2333static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2334{
2335 struct net *net = sock_net(sk);
2336 int err;
2337 struct sadb_address *sa;
2338 struct sadb_x_policy *pol;
2339 struct xfrm_policy *xp;
2340 struct xfrm_selector sel;
2341 struct km_event c;
2342 struct sadb_x_sec_ctx *sec_ctx;
2343 struct xfrm_sec_ctx *pol_ctx = NULL;
2344
2345 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2346 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2347 !ext_hdrs[SADB_X_EXT_POLICY-1])
2348 return -EINVAL;
2349
2350 pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2351 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2352 return -EINVAL;
2353
2354 memset(&sel, 0, sizeof(sel));
2355
2356 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2357 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2358 sel.prefixlen_s = sa->sadb_address_prefixlen;
2359 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2360 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2361 if (sel.sport)
2362 sel.sport_mask = htons(0xffff);
2363
2364 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2365 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2366 sel.prefixlen_d = sa->sadb_address_prefixlen;
2367 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2368 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2369 if (sel.dport)
2370 sel.dport_mask = htons(0xffff);
2371
2372 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2373 if (sec_ctx != NULL) {
2374 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2375
2376 if (!uctx)
2377 return -ENOMEM;
2378
2379 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2380 kfree(uctx);
2381 if (err)
2382 return err;
2383 }
2384
2385 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2386 pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2387 1, &err);
2388 security_xfrm_policy_free(pol_ctx);
2389 if (xp == NULL)
2390 return -ENOENT;
2391
2392 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2393
2394 if (err)
2395 goto out;
2396
2397 c.seq = hdr->sadb_msg_seq;
2398 c.portid = hdr->sadb_msg_pid;
2399 c.data.byid = 0;
2400 c.event = XFRM_MSG_DELPOLICY;
2401 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2402
2403out:
2404 xfrm_pol_put(xp);
2405 if (err == 0)
2406 xfrm_garbage_collect(net);
2407 return err;
2408}
2409
2410static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2411{
2412 int err;
2413 struct sk_buff *out_skb;
2414 struct sadb_msg *out_hdr;
2415 err = 0;
2416
2417 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2418 if (IS_ERR(out_skb)) {
2419 err = PTR_ERR(out_skb);
2420 goto out;
2421 }
2422 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2423 if (err < 0)
2424 goto out;
2425
2426 out_hdr = (struct sadb_msg *) out_skb->data;
2427 out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2428 out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2429 out_hdr->sadb_msg_satype = 0;
2430 out_hdr->sadb_msg_errno = 0;
2431 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2432 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2433 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2434 err = 0;
2435
2436out:
2437 return err;
2438}
2439
2440static int pfkey_sockaddr_pair_size(sa_family_t family)
2441{
2442 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2443}
2444
2445static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2446 xfrm_address_t *saddr, xfrm_address_t *daddr,
2447 u16 *family)
2448{
2449 int af, socklen;
2450
2451 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2452 return -EINVAL;
2453
2454 af = pfkey_sockaddr_extract(sa, saddr);
2455 if (!af)
2456 return -EINVAL;
2457
2458 socklen = pfkey_sockaddr_len(af);
2459 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2460 daddr) != af)
2461 return -EINVAL;
2462
2463 *family = af;
2464 return 0;
2465}
2466
2467#ifdef CONFIG_NET_KEY_MIGRATE
2468static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2469 struct xfrm_migrate *m)
2470{
2471 int err;
2472 struct sadb_x_ipsecrequest *rq2;
2473 int mode;
2474
2475 if (len < sizeof(*rq1) ||
2476 len < rq1->sadb_x_ipsecrequest_len ||
2477 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2478 return -EINVAL;
2479
2480
2481 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2482 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2483 &m->old_saddr, &m->old_daddr,
2484 &m->old_family);
2485 if (err)
2486 return err;
2487
2488 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2489 len -= rq1->sadb_x_ipsecrequest_len;
2490
2491 if (len <= sizeof(*rq2) ||
2492 len < rq2->sadb_x_ipsecrequest_len ||
2493 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2494 return -EINVAL;
2495
2496
2497 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2498 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2499 &m->new_saddr, &m->new_daddr,
2500 &m->new_family);
2501 if (err)
2502 return err;
2503
2504 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2505 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2506 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2507 return -EINVAL;
2508
2509 m->proto = rq1->sadb_x_ipsecrequest_proto;
2510 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2511 return -EINVAL;
2512 m->mode = mode;
2513 m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2514
2515 return ((int)(rq1->sadb_x_ipsecrequest_len +
2516 rq2->sadb_x_ipsecrequest_len));
2517}
2518
2519static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2520 const struct sadb_msg *hdr, void * const *ext_hdrs)
2521{
2522 int i, len, ret, err = -EINVAL;
2523 u8 dir;
2524 struct sadb_address *sa;
2525 struct sadb_x_kmaddress *kma;
2526 struct sadb_x_policy *pol;
2527 struct sadb_x_ipsecrequest *rq;
2528 struct xfrm_selector sel;
2529 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2530 struct xfrm_kmaddress k;
2531 struct net *net = sock_net(sk);
2532
2533 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2534 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2535 !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2536 err = -EINVAL;
2537 goto out;
2538 }
2539
2540 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2541 pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2542
2543 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2544 err = -EINVAL;
2545 goto out;
2546 }
2547
2548 if (kma) {
2549
2550 k.reserved = kma->sadb_x_kmaddress_reserved;
2551 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2552 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2553 &k.local, &k.remote, &k.family);
2554 if (ret < 0) {
2555 err = ret;
2556 goto out;
2557 }
2558 }
2559
2560 dir = pol->sadb_x_policy_dir - 1;
2561 memset(&sel, 0, sizeof(sel));
2562
2563
2564 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2565 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2566 sel.prefixlen_s = sa->sadb_address_prefixlen;
2567 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2568 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2569 if (sel.sport)
2570 sel.sport_mask = htons(0xffff);
2571
2572
2573 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2574 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2575 sel.prefixlen_d = sa->sadb_address_prefixlen;
2576 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2577 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2578 if (sel.dport)
2579 sel.dport_mask = htons(0xffff);
2580
2581 rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2582
2583
2584 i = 0;
2585 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2586
2587 while (len > 0 && i < XFRM_MAX_DEPTH) {
2588 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2589 if (ret < 0) {
2590 err = ret;
2591 goto out;
2592 } else {
2593 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2594 len -= ret;
2595 i++;
2596 }
2597 }
2598
2599 if (!i || len > 0) {
2600 err = -EINVAL;
2601 goto out;
2602 }
2603
2604 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2605 kma ? &k : NULL, net);
2606
2607 out:
2608 return err;
2609}
2610#else
2611static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2612 const struct sadb_msg *hdr, void * const *ext_hdrs)
2613{
2614 return -ENOPROTOOPT;
2615}
2616#endif
2617
2618
2619static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2620{
2621 struct net *net = sock_net(sk);
2622 unsigned int dir;
2623 int err = 0, delete;
2624 struct sadb_x_policy *pol;
2625 struct xfrm_policy *xp;
2626 struct km_event c;
2627
2628 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2629 return -EINVAL;
2630
2631 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2632 if (dir >= XFRM_POLICY_MAX)
2633 return -EINVAL;
2634
2635 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2636 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2637 dir, pol->sadb_x_policy_id, delete, &err);
2638 if (xp == NULL)
2639 return -ENOENT;
2640
2641 if (delete) {
2642 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2643
2644 if (err)
2645 goto out;
2646 c.seq = hdr->sadb_msg_seq;
2647 c.portid = hdr->sadb_msg_pid;
2648 c.data.byid = 1;
2649 c.event = XFRM_MSG_DELPOLICY;
2650 km_policy_notify(xp, dir, &c);
2651 } else {
2652 err = key_pol_get_resp(sk, xp, hdr, dir);
2653 }
2654
2655out:
2656 xfrm_pol_put(xp);
2657 if (delete && err == 0)
2658 xfrm_garbage_collect(net);
2659 return err;
2660}
2661
2662static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2663{
2664 struct pfkey_sock *pfk = ptr;
2665 struct sk_buff *out_skb;
2666 struct sadb_msg *out_hdr;
2667 int err;
2668
2669 if (!pfkey_can_dump(&pfk->sk))
2670 return -ENOBUFS;
2671
2672 out_skb = pfkey_xfrm_policy2msg_prep(xp);
2673 if (IS_ERR(out_skb))
2674 return PTR_ERR(out_skb);
2675
2676 err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2677 if (err < 0)
2678 return err;
2679
2680 out_hdr = (struct sadb_msg *) out_skb->data;
2681 out_hdr->sadb_msg_version = pfk->dump.msg_version;
2682 out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2683 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2684 out_hdr->sadb_msg_errno = 0;
2685 out_hdr->sadb_msg_seq = count + 1;
2686 out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2687
2688 if (pfk->dump.skb)
2689 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2690 &pfk->sk, sock_net(&pfk->sk));
2691 pfk->dump.skb = out_skb;
2692
2693 return 0;
2694}
2695
2696static int pfkey_dump_sp(struct pfkey_sock *pfk)
2697{
2698 struct net *net = sock_net(&pfk->sk);
2699 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2700}
2701
2702static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2703{
2704 struct net *net = sock_net((struct sock *)pfk);
2705
2706 xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2707}
2708
2709static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2710{
2711 struct pfkey_sock *pfk = pfkey_sk(sk);
2712
2713 mutex_lock(&pfk->dump_lock);
2714 if (pfk->dump.dump != NULL) {
2715 mutex_unlock(&pfk->dump_lock);
2716 return -EBUSY;
2717 }
2718
2719 pfk->dump.msg_version = hdr->sadb_msg_version;
2720 pfk->dump.msg_portid = hdr->sadb_msg_pid;
2721 pfk->dump.dump = pfkey_dump_sp;
2722 pfk->dump.done = pfkey_dump_sp_done;
2723 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2724 mutex_unlock(&pfk->dump_lock);
2725
2726 return pfkey_do_dump(pfk);
2727}
2728
2729static int key_notify_policy_flush(const struct km_event *c)
2730{
2731 struct sk_buff *skb_out;
2732 struct sadb_msg *hdr;
2733
2734 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2735 if (!skb_out)
2736 return -ENOBUFS;
2737 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2738 hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2739 hdr->sadb_msg_seq = c->seq;
2740 hdr->sadb_msg_pid = c->portid;
2741 hdr->sadb_msg_version = PF_KEY_V2;
2742 hdr->sadb_msg_errno = (uint8_t) 0;
2743 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2744 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2745 hdr->sadb_msg_reserved = 0;
2746 pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2747 return 0;
2748
2749}
2750
2751static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2752{
2753 struct net *net = sock_net(sk);
2754 struct km_event c;
2755 int err, err2;
2756
2757 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2758 err2 = unicast_flush_resp(sk, hdr);
2759 if (err || err2) {
2760 if (err == -ESRCH)
2761 return 0;
2762 return err;
2763 }
2764
2765 c.data.type = XFRM_POLICY_TYPE_MAIN;
2766 c.event = XFRM_MSG_FLUSHPOLICY;
2767 c.portid = hdr->sadb_msg_pid;
2768 c.seq = hdr->sadb_msg_seq;
2769 c.net = net;
2770 km_policy_notify(NULL, 0, &c);
2771
2772 return 0;
2773}
2774
2775typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2776 const struct sadb_msg *hdr, void * const *ext_hdrs);
2777static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2778 [SADB_RESERVED] = pfkey_reserved,
2779 [SADB_GETSPI] = pfkey_getspi,
2780 [SADB_UPDATE] = pfkey_add,
2781 [SADB_ADD] = pfkey_add,
2782 [SADB_DELETE] = pfkey_delete,
2783 [SADB_GET] = pfkey_get,
2784 [SADB_ACQUIRE] = pfkey_acquire,
2785 [SADB_REGISTER] = pfkey_register,
2786 [SADB_EXPIRE] = NULL,
2787 [SADB_FLUSH] = pfkey_flush,
2788 [SADB_DUMP] = pfkey_dump,
2789 [SADB_X_PROMISC] = pfkey_promisc,
2790 [SADB_X_PCHANGE] = NULL,
2791 [SADB_X_SPDUPDATE] = pfkey_spdadd,
2792 [SADB_X_SPDADD] = pfkey_spdadd,
2793 [SADB_X_SPDDELETE] = pfkey_spddelete,
2794 [SADB_X_SPDGET] = pfkey_spdget,
2795 [SADB_X_SPDACQUIRE] = NULL,
2796 [SADB_X_SPDDUMP] = pfkey_spddump,
2797 [SADB_X_SPDFLUSH] = pfkey_spdflush,
2798 [SADB_X_SPDSETIDX] = pfkey_spdadd,
2799 [SADB_X_SPDDELETE2] = pfkey_spdget,
2800 [SADB_X_MIGRATE] = pfkey_migrate,
2801};
2802
2803static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2804{
2805 void *ext_hdrs[SADB_EXT_MAX];
2806 int err;
2807
2808 pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2809 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2810
2811 memset(ext_hdrs, 0, sizeof(ext_hdrs));
2812 err = parse_exthdrs(skb, hdr, ext_hdrs);
2813 if (!err) {
2814 err = -EOPNOTSUPP;
2815 if (pfkey_funcs[hdr->sadb_msg_type])
2816 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2817 }
2818 return err;
2819}
2820
2821static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2822{
2823 struct sadb_msg *hdr = NULL;
2824
2825 if (skb->len < sizeof(*hdr)) {
2826 *errp = -EMSGSIZE;
2827 } else {
2828 hdr = (struct sadb_msg *) skb->data;
2829 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2830 hdr->sadb_msg_reserved != 0 ||
2831 (hdr->sadb_msg_type <= SADB_RESERVED ||
2832 hdr->sadb_msg_type > SADB_MAX)) {
2833 hdr = NULL;
2834 *errp = -EINVAL;
2835 } else if (hdr->sadb_msg_len != (skb->len /
2836 sizeof(uint64_t)) ||
2837 hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2838 sizeof(uint64_t))) {
2839 hdr = NULL;
2840 *errp = -EMSGSIZE;
2841 } else {
2842 *errp = 0;
2843 }
2844 }
2845 return hdr;
2846}
2847
2848static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2849 const struct xfrm_algo_desc *d)
2850{
2851 unsigned int id = d->desc.sadb_alg_id;
2852
2853 if (id >= sizeof(t->aalgos) * 8)
2854 return 0;
2855
2856 return (t->aalgos >> id) & 1;
2857}
2858
2859static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2860 const struct xfrm_algo_desc *d)
2861{
2862 unsigned int id = d->desc.sadb_alg_id;
2863
2864 if (id >= sizeof(t->ealgos) * 8)
2865 return 0;
2866
2867 return (t->ealgos >> id) & 1;
2868}
2869
2870static int count_ah_combs(const struct xfrm_tmpl *t)
2871{
2872 int i, sz = 0;
2873
2874 for (i = 0; ; i++) {
2875 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2876 if (!aalg)
2877 break;
2878 if (!aalg->pfkey_supported)
2879 continue;
2880 if (aalg_tmpl_set(t, aalg) && aalg->available)
2881 sz += sizeof(struct sadb_comb);
2882 }
2883 return sz + sizeof(struct sadb_prop);
2884}
2885
2886static int count_esp_combs(const struct xfrm_tmpl *t)
2887{
2888 int i, k, sz = 0;
2889
2890 for (i = 0; ; i++) {
2891 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2892 if (!ealg)
2893 break;
2894
2895 if (!ealg->pfkey_supported)
2896 continue;
2897
2898 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2899 continue;
2900
2901 for (k = 1; ; k++) {
2902 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2903 if (!aalg)
2904 break;
2905
2906 if (!aalg->pfkey_supported)
2907 continue;
2908
2909 if (aalg_tmpl_set(t, aalg) && aalg->available)
2910 sz += sizeof(struct sadb_comb);
2911 }
2912 }
2913 return sz + sizeof(struct sadb_prop);
2914}
2915
2916static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2917{
2918 struct sadb_prop *p;
2919 int i;
2920
2921 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2922 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2923 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2924 p->sadb_prop_replay = 32;
2925 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2926
2927 for (i = 0; ; i++) {
2928 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2929 if (!aalg)
2930 break;
2931
2932 if (!aalg->pfkey_supported)
2933 continue;
2934
2935 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2936 struct sadb_comb *c;
2937 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2938 memset(c, 0, sizeof(*c));
2939 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2940 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2941 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2942 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2943 c->sadb_comb_hard_addtime = 24*60*60;
2944 c->sadb_comb_soft_addtime = 20*60*60;
2945 c->sadb_comb_hard_usetime = 8*60*60;
2946 c->sadb_comb_soft_usetime = 7*60*60;
2947 }
2948 }
2949}
2950
2951static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2952{
2953 struct sadb_prop *p;
2954 int i, k;
2955
2956 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2957 p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2958 p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2959 p->sadb_prop_replay = 32;
2960 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2961
2962 for (i=0; ; i++) {
2963 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2964 if (!ealg)
2965 break;
2966
2967 if (!ealg->pfkey_supported)
2968 continue;
2969
2970 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2971 continue;
2972
2973 for (k = 1; ; k++) {
2974 struct sadb_comb *c;
2975 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2976 if (!aalg)
2977 break;
2978 if (!aalg->pfkey_supported)
2979 continue;
2980 if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2981 continue;
2982 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2983 memset(c, 0, sizeof(*c));
2984 p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2985 c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2986 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2987 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2988 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2989 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2990 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2991 c->sadb_comb_hard_addtime = 24*60*60;
2992 c->sadb_comb_soft_addtime = 20*60*60;
2993 c->sadb_comb_hard_usetime = 8*60*60;
2994 c->sadb_comb_soft_usetime = 7*60*60;
2995 }
2996 }
2997}
2998
2999static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3000{
3001 return 0;
3002}
3003
3004static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3005{
3006 struct sk_buff *out_skb;
3007 struct sadb_msg *out_hdr;
3008 int hard;
3009 int hsc;
3010
3011 hard = c->data.hard;
3012 if (hard)
3013 hsc = 2;
3014 else
3015 hsc = 1;
3016
3017 out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3018 if (IS_ERR(out_skb))
3019 return PTR_ERR(out_skb);
3020
3021 out_hdr = (struct sadb_msg *) out_skb->data;
3022 out_hdr->sadb_msg_version = PF_KEY_V2;
3023 out_hdr->sadb_msg_type = SADB_EXPIRE;
3024 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3025 out_hdr->sadb_msg_errno = 0;
3026 out_hdr->sadb_msg_reserved = 0;
3027 out_hdr->sadb_msg_seq = 0;
3028 out_hdr->sadb_msg_pid = 0;
3029
3030 pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3031 return 0;
3032}
3033
3034static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3035{
3036 struct net *net = x ? xs_net(x) : c->net;
3037 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3038
3039 if (atomic_read(&net_pfkey->socks_nr) == 0)
3040 return 0;
3041
3042 switch (c->event) {
3043 case XFRM_MSG_EXPIRE:
3044 return key_notify_sa_expire(x, c);
3045 case XFRM_MSG_DELSA:
3046 case XFRM_MSG_NEWSA:
3047 case XFRM_MSG_UPDSA:
3048 return key_notify_sa(x, c);
3049 case XFRM_MSG_FLUSHSA:
3050 return key_notify_sa_flush(c);
3051 case XFRM_MSG_NEWAE:
3052 break;
3053 default:
3054 pr_err("pfkey: Unknown SA event %d\n", c->event);
3055 break;
3056 }
3057
3058 return 0;
3059}
3060
3061static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3062{
3063 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3064 return 0;
3065
3066 switch (c->event) {
3067 case XFRM_MSG_POLEXPIRE:
3068 return key_notify_policy_expire(xp, c);
3069 case XFRM_MSG_DELPOLICY:
3070 case XFRM_MSG_NEWPOLICY:
3071 case XFRM_MSG_UPDPOLICY:
3072 return key_notify_policy(xp, dir, c);
3073 case XFRM_MSG_FLUSHPOLICY:
3074 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3075 break;
3076 return key_notify_policy_flush(c);
3077 default:
3078 pr_err("pfkey: Unknown policy event %d\n", c->event);
3079 break;
3080 }
3081
3082 return 0;
3083}
3084
3085static u32 get_acqseq(void)
3086{
3087 u32 res;
3088 static atomic_t acqseq;
3089
3090 do {
3091 res = atomic_inc_return(&acqseq);
3092 } while (!res);
3093 return res;
3094}
3095
3096static bool pfkey_is_alive(const struct km_event *c)
3097{
3098 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3099 struct sock *sk;
3100 bool is_alive = false;
3101
3102 rcu_read_lock();
3103 sk_for_each_rcu(sk, &net_pfkey->table) {
3104 if (pfkey_sk(sk)->registered) {
3105 is_alive = true;
3106 break;
3107 }
3108 }
3109 rcu_read_unlock();
3110
3111 return is_alive;
3112}
3113
3114static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3115{
3116 struct sk_buff *skb;
3117 struct sadb_msg *hdr;
3118 struct sadb_address *addr;
3119 struct sadb_x_policy *pol;
3120 int sockaddr_size;
3121 int size;
3122 struct sadb_x_sec_ctx *sec_ctx;
3123 struct xfrm_sec_ctx *xfrm_ctx;
3124 int ctx_size = 0;
3125
3126 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3127 if (!sockaddr_size)
3128 return -EINVAL;
3129
3130 size = sizeof(struct sadb_msg) +
3131 (sizeof(struct sadb_address) * 2) +
3132 (sockaddr_size * 2) +
3133 sizeof(struct sadb_x_policy);
3134
3135 if (x->id.proto == IPPROTO_AH)
3136 size += count_ah_combs(t);
3137 else if (x->id.proto == IPPROTO_ESP)
3138 size += count_esp_combs(t);
3139
3140 if ((xfrm_ctx = x->security)) {
3141 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3142 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
3143 }
3144
3145 skb = alloc_skb(size + 16, GFP_ATOMIC);
3146 if (skb == NULL)
3147 return -ENOMEM;
3148
3149 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3150 hdr->sadb_msg_version = PF_KEY_V2;
3151 hdr->sadb_msg_type = SADB_ACQUIRE;
3152 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3153 hdr->sadb_msg_len = size / sizeof(uint64_t);
3154 hdr->sadb_msg_errno = 0;
3155 hdr->sadb_msg_reserved = 0;
3156 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3157 hdr->sadb_msg_pid = 0;
3158
3159
3160 addr = (struct sadb_address*) skb_put(skb,
3161 sizeof(struct sadb_address)+sockaddr_size);
3162 addr->sadb_address_len =
3163 (sizeof(struct sadb_address)+sockaddr_size)/
3164 sizeof(uint64_t);
3165 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3166 addr->sadb_address_proto = 0;
3167 addr->sadb_address_reserved = 0;
3168 addr->sadb_address_prefixlen =
3169 pfkey_sockaddr_fill(&x->props.saddr, 0,
3170 (struct sockaddr *) (addr + 1),
3171 x->props.family);
3172 if (!addr->sadb_address_prefixlen)
3173 BUG();
3174
3175
3176 addr = (struct sadb_address*) skb_put(skb,
3177 sizeof(struct sadb_address)+sockaddr_size);
3178 addr->sadb_address_len =
3179 (sizeof(struct sadb_address)+sockaddr_size)/
3180 sizeof(uint64_t);
3181 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3182 addr->sadb_address_proto = 0;
3183 addr->sadb_address_reserved = 0;
3184 addr->sadb_address_prefixlen =
3185 pfkey_sockaddr_fill(&x->id.daddr, 0,
3186 (struct sockaddr *) (addr + 1),
3187 x->props.family);
3188 if (!addr->sadb_address_prefixlen)
3189 BUG();
3190
3191 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy));
3192 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3193 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3194 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3195 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3196 pol->sadb_x_policy_reserved = 0;
3197 pol->sadb_x_policy_id = xp->index;
3198 pol->sadb_x_policy_priority = xp->priority;
3199
3200
3201 if (x->id.proto == IPPROTO_AH)
3202 dump_ah_combs(skb, t);
3203 else if (x->id.proto == IPPROTO_ESP)
3204 dump_esp_combs(skb, t);
3205
3206
3207 if (xfrm_ctx) {
3208 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3209 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3210 sec_ctx->sadb_x_sec_len =
3211 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3212 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3213 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3214 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3215 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3216 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3217 xfrm_ctx->ctx_len);
3218 }
3219
3220 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3221}
3222
3223static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3224 u8 *data, int len, int *dir)
3225{
3226 struct net *net = sock_net(sk);
3227 struct xfrm_policy *xp;
3228 struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3229 struct sadb_x_sec_ctx *sec_ctx;
3230
3231 switch (sk->sk_family) {
3232 case AF_INET:
3233 if (opt != IP_IPSEC_POLICY) {
3234 *dir = -EOPNOTSUPP;
3235 return NULL;
3236 }
3237 break;
3238#if IS_ENABLED(CONFIG_IPV6)
3239 case AF_INET6:
3240 if (opt != IPV6_IPSEC_POLICY) {
3241 *dir = -EOPNOTSUPP;
3242 return NULL;
3243 }
3244 break;
3245#endif
3246 default:
3247 *dir = -EINVAL;
3248 return NULL;
3249 }
3250
3251 *dir = -EINVAL;
3252
3253 if (len < sizeof(struct sadb_x_policy) ||
3254 pol->sadb_x_policy_len*8 > len ||
3255 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3256 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3257 return NULL;
3258
3259 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3260 if (xp == NULL) {
3261 *dir = -ENOBUFS;
3262 return NULL;
3263 }
3264
3265 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3266 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3267
3268 xp->lft.soft_byte_limit = XFRM_INF;
3269 xp->lft.hard_byte_limit = XFRM_INF;
3270 xp->lft.soft_packet_limit = XFRM_INF;
3271 xp->lft.hard_packet_limit = XFRM_INF;
3272 xp->family = sk->sk_family;
3273
3274 xp->xfrm_nr = 0;
3275 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3276 (*dir = parse_ipsecrequests(xp, pol)) < 0)
3277 goto out;
3278
3279
3280 if (len >= (pol->sadb_x_policy_len*8 +
3281 sizeof(struct sadb_x_sec_ctx))) {
3282 char *p = (char *)pol;
3283 struct xfrm_user_sec_ctx *uctx;
3284
3285 p += pol->sadb_x_policy_len*8;
3286 sec_ctx = (struct sadb_x_sec_ctx *)p;
3287 if (len < pol->sadb_x_policy_len*8 +
3288 sec_ctx->sadb_x_sec_len) {
3289 *dir = -EINVAL;
3290 goto out;
3291 }
3292 if ((*dir = verify_sec_ctx_len(p)))
3293 goto out;
3294 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3295 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3296 kfree(uctx);
3297
3298 if (*dir)
3299 goto out;
3300 }
3301
3302 *dir = pol->sadb_x_policy_dir-1;
3303 return xp;
3304
3305out:
3306 xp->walk.dead = 1;
3307 xfrm_policy_destroy(xp);
3308 return NULL;
3309}
3310
3311static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3312{
3313 struct sk_buff *skb;
3314 struct sadb_msg *hdr;
3315 struct sadb_sa *sa;
3316 struct sadb_address *addr;
3317 struct sadb_x_nat_t_port *n_port;
3318 int sockaddr_size;
3319 int size;
3320 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3321 struct xfrm_encap_tmpl *natt = NULL;
3322
3323 sockaddr_size = pfkey_sockaddr_size(x->props.family);
3324 if (!sockaddr_size)
3325 return -EINVAL;
3326
3327 if (!satype)
3328 return -EINVAL;
3329
3330 if (!x->encap)
3331 return -EINVAL;
3332
3333 natt = x->encap;
3334
3335
3336
3337
3338
3339
3340
3341 size = sizeof(struct sadb_msg) +
3342 sizeof(struct sadb_sa) +
3343 (sizeof(struct sadb_address) * 2) +
3344 (sockaddr_size * 2) +
3345 (sizeof(struct sadb_x_nat_t_port) * 2);
3346
3347 skb = alloc_skb(size + 16, GFP_ATOMIC);
3348 if (skb == NULL)
3349 return -ENOMEM;
3350
3351 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3352 hdr->sadb_msg_version = PF_KEY_V2;
3353 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3354 hdr->sadb_msg_satype = satype;
3355 hdr->sadb_msg_len = size / sizeof(uint64_t);
3356 hdr->sadb_msg_errno = 0;
3357 hdr->sadb_msg_reserved = 0;
3358 hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3359 hdr->sadb_msg_pid = 0;
3360
3361
3362 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3363 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3364 sa->sadb_sa_exttype = SADB_EXT_SA;
3365 sa->sadb_sa_spi = x->id.spi;
3366 sa->sadb_sa_replay = 0;
3367 sa->sadb_sa_state = 0;
3368 sa->sadb_sa_auth = 0;
3369 sa->sadb_sa_encrypt = 0;
3370 sa->sadb_sa_flags = 0;
3371
3372
3373 addr = (struct sadb_address*)
3374 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3375 addr->sadb_address_len =
3376 (sizeof(struct sadb_address)+sockaddr_size)/
3377 sizeof(uint64_t);
3378 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3379 addr->sadb_address_proto = 0;
3380 addr->sadb_address_reserved = 0;
3381 addr->sadb_address_prefixlen =
3382 pfkey_sockaddr_fill(&x->props.saddr, 0,
3383 (struct sockaddr *) (addr + 1),
3384 x->props.family);
3385 if (!addr->sadb_address_prefixlen)
3386 BUG();
3387
3388
3389 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3390 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3391 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3392 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3393 n_port->sadb_x_nat_t_port_reserved = 0;
3394
3395
3396 addr = (struct sadb_address*)
3397 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3398 addr->sadb_address_len =
3399 (sizeof(struct sadb_address)+sockaddr_size)/
3400 sizeof(uint64_t);
3401 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3402 addr->sadb_address_proto = 0;
3403 addr->sadb_address_reserved = 0;
3404 addr->sadb_address_prefixlen =
3405 pfkey_sockaddr_fill(ipaddr, 0,
3406 (struct sockaddr *) (addr + 1),
3407 x->props.family);
3408 if (!addr->sadb_address_prefixlen)
3409 BUG();
3410
3411
3412 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3413 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3414 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3415 n_port->sadb_x_nat_t_port_port = sport;
3416 n_port->sadb_x_nat_t_port_reserved = 0;
3417
3418 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3419}
3420
3421#ifdef CONFIG_NET_KEY_MIGRATE
3422static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3423 const struct xfrm_selector *sel)
3424{
3425 struct sadb_address *addr;
3426 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3427 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3428 addr->sadb_address_exttype = type;
3429 addr->sadb_address_proto = sel->proto;
3430 addr->sadb_address_reserved = 0;
3431
3432 switch (type) {
3433 case SADB_EXT_ADDRESS_SRC:
3434 addr->sadb_address_prefixlen = sel->prefixlen_s;
3435 pfkey_sockaddr_fill(&sel->saddr, 0,
3436 (struct sockaddr *)(addr + 1),
3437 sel->family);
3438 break;
3439 case SADB_EXT_ADDRESS_DST:
3440 addr->sadb_address_prefixlen = sel->prefixlen_d;
3441 pfkey_sockaddr_fill(&sel->daddr, 0,
3442 (struct sockaddr *)(addr + 1),
3443 sel->family);
3444 break;
3445 default:
3446 return -EINVAL;
3447 }
3448
3449 return 0;
3450}
3451
3452
3453static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3454{
3455 struct sadb_x_kmaddress *kma;
3456 u8 *sa;
3457 int family = k->family;
3458 int socklen = pfkey_sockaddr_len(family);
3459 int size_req;
3460
3461 size_req = (sizeof(struct sadb_x_kmaddress) +
3462 pfkey_sockaddr_pair_size(family));
3463
3464 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3465 memset(kma, 0, size_req);
3466 kma->sadb_x_kmaddress_len = size_req / 8;
3467 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3468 kma->sadb_x_kmaddress_reserved = k->reserved;
3469
3470 sa = (u8 *)(kma + 1);
3471 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3472 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3473 return -EINVAL;
3474
3475 return 0;
3476}
3477
3478static int set_ipsecrequest(struct sk_buff *skb,
3479 uint8_t proto, uint8_t mode, int level,
3480 uint32_t reqid, uint8_t family,
3481 const xfrm_address_t *src, const xfrm_address_t *dst)
3482{
3483 struct sadb_x_ipsecrequest *rq;
3484 u8 *sa;
3485 int socklen = pfkey_sockaddr_len(family);
3486 int size_req;
3487
3488 size_req = sizeof(struct sadb_x_ipsecrequest) +
3489 pfkey_sockaddr_pair_size(family);
3490
3491 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3492 memset(rq, 0, size_req);
3493 rq->sadb_x_ipsecrequest_len = size_req;
3494 rq->sadb_x_ipsecrequest_proto = proto;
3495 rq->sadb_x_ipsecrequest_mode = mode;
3496 rq->sadb_x_ipsecrequest_level = level;
3497 rq->sadb_x_ipsecrequest_reqid = reqid;
3498
3499 sa = (u8 *) (rq + 1);
3500 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3501 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3502 return -EINVAL;
3503
3504 return 0;
3505}
3506#endif
3507
3508#ifdef CONFIG_NET_KEY_MIGRATE
3509static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3510 const struct xfrm_migrate *m, int num_bundles,
3511 const struct xfrm_kmaddress *k)
3512{
3513 int i;
3514 int sasize_sel;
3515 int size = 0;
3516 int size_pol = 0;
3517 struct sk_buff *skb;
3518 struct sadb_msg *hdr;
3519 struct sadb_x_policy *pol;
3520 const struct xfrm_migrate *mp;
3521
3522 if (type != XFRM_POLICY_TYPE_MAIN)
3523 return 0;
3524
3525 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3526 return -EINVAL;
3527
3528 if (k != NULL) {
3529
3530 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3531 pfkey_sockaddr_pair_size(k->family));
3532 }
3533
3534
3535 sasize_sel = pfkey_sockaddr_size(sel->family);
3536 if (!sasize_sel)
3537 return -EINVAL;
3538 size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3539
3540
3541 size_pol += sizeof(struct sadb_x_policy);
3542
3543
3544 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3545
3546 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3547 pfkey_sockaddr_pair_size(mp->old_family);
3548
3549 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3550 pfkey_sockaddr_pair_size(mp->new_family);
3551 }
3552
3553 size += sizeof(struct sadb_msg) + size_pol;
3554
3555
3556 skb = alloc_skb(size, GFP_ATOMIC);
3557 if (skb == NULL)
3558 return -ENOMEM;
3559
3560 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3561 hdr->sadb_msg_version = PF_KEY_V2;
3562 hdr->sadb_msg_type = SADB_X_MIGRATE;
3563 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3564 hdr->sadb_msg_len = size / 8;
3565 hdr->sadb_msg_errno = 0;
3566 hdr->sadb_msg_reserved = 0;
3567 hdr->sadb_msg_seq = 0;
3568 hdr->sadb_msg_pid = 0;
3569
3570
3571 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3572 goto err;
3573
3574
3575 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3576
3577
3578 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3579
3580
3581 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3582 pol->sadb_x_policy_len = size_pol / 8;
3583 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3584 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3585 pol->sadb_x_policy_dir = dir + 1;
3586 pol->sadb_x_policy_reserved = 0;
3587 pol->sadb_x_policy_id = 0;
3588 pol->sadb_x_policy_priority = 0;
3589
3590 for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3591
3592 int mode = pfkey_mode_from_xfrm(mp->mode);
3593 if (mode < 0)
3594 goto err;
3595 if (set_ipsecrequest(skb, mp->proto, mode,
3596 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3597 mp->reqid, mp->old_family,
3598 &mp->old_saddr, &mp->old_daddr) < 0)
3599 goto err;
3600
3601
3602 if (set_ipsecrequest(skb, mp->proto, mode,
3603 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3604 mp->reqid, mp->new_family,
3605 &mp->new_saddr, &mp->new_daddr) < 0)
3606 goto err;
3607 }
3608
3609
3610 pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3611
3612 return 0;
3613
3614err:
3615 kfree_skb(skb);
3616 return -EINVAL;
3617}
3618#else
3619static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3620 const struct xfrm_migrate *m, int num_bundles,
3621 const struct xfrm_kmaddress *k)
3622{
3623 return -ENOPROTOOPT;
3624}
3625#endif
3626
3627static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3628{
3629 struct sock *sk = sock->sk;
3630 struct sk_buff *skb = NULL;
3631 struct sadb_msg *hdr = NULL;
3632 int err;
3633 struct net *net = sock_net(sk);
3634
3635 err = -EOPNOTSUPP;
3636 if (msg->msg_flags & MSG_OOB)
3637 goto out;
3638
3639 err = -EMSGSIZE;
3640 if ((unsigned int)len > sk->sk_sndbuf - 32)
3641 goto out;
3642
3643 err = -ENOBUFS;
3644 skb = alloc_skb(len, GFP_KERNEL);
3645 if (skb == NULL)
3646 goto out;
3647
3648 err = -EFAULT;
3649 if (memcpy_from_msg(skb_put(skb,len), msg, len))
3650 goto out;
3651
3652 hdr = pfkey_get_base_msg(skb, &err);
3653 if (!hdr)
3654 goto out;
3655
3656 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3657 err = pfkey_process(sk, skb, hdr);
3658 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3659
3660out:
3661 if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3662 err = 0;
3663 kfree_skb(skb);
3664
3665 return err ? : len;
3666}
3667
3668static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3669 int flags)
3670{
3671 struct sock *sk = sock->sk;
3672 struct pfkey_sock *pfk = pfkey_sk(sk);
3673 struct sk_buff *skb;
3674 int copied, err;
3675
3676 err = -EINVAL;
3677 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3678 goto out;
3679
3680 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3681 if (skb == NULL)
3682 goto out;
3683
3684 copied = skb->len;
3685 if (copied > len) {
3686 msg->msg_flags |= MSG_TRUNC;
3687 copied = len;
3688 }
3689
3690 skb_reset_transport_header(skb);
3691 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3692 if (err)
3693 goto out_free;
3694
3695 sock_recv_ts_and_drops(msg, sk, skb);
3696
3697 err = (flags & MSG_TRUNC) ? skb->len : copied;
3698
3699 if (pfk->dump.dump != NULL &&
3700 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3701 pfkey_do_dump(pfk);
3702
3703out_free:
3704 skb_free_datagram(sk, skb);
3705out:
3706 return err;
3707}
3708
3709static const struct proto_ops pfkey_ops = {
3710 .family = PF_KEY,
3711 .owner = THIS_MODULE,
3712
3713 .bind = sock_no_bind,
3714 .connect = sock_no_connect,
3715 .socketpair = sock_no_socketpair,
3716 .accept = sock_no_accept,
3717 .getname = sock_no_getname,
3718 .ioctl = sock_no_ioctl,
3719 .listen = sock_no_listen,
3720 .shutdown = sock_no_shutdown,
3721 .setsockopt = sock_no_setsockopt,
3722 .getsockopt = sock_no_getsockopt,
3723 .mmap = sock_no_mmap,
3724 .sendpage = sock_no_sendpage,
3725
3726
3727 .release = pfkey_release,
3728 .poll = datagram_poll,
3729 .sendmsg = pfkey_sendmsg,
3730 .recvmsg = pfkey_recvmsg,
3731};
3732
3733static const struct net_proto_family pfkey_family_ops = {
3734 .family = PF_KEY,
3735 .create = pfkey_create,
3736 .owner = THIS_MODULE,
3737};
3738
3739#ifdef CONFIG_PROC_FS
3740static int pfkey_seq_show(struct seq_file *f, void *v)
3741{
3742 struct sock *s = sk_entry(v);
3743
3744 if (v == SEQ_START_TOKEN)
3745 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n");
3746 else
3747 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3748 s,
3749 atomic_read(&s->sk_refcnt),
3750 sk_rmem_alloc_get(s),
3751 sk_wmem_alloc_get(s),
3752 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3753 sock_i_ino(s)
3754 );
3755 return 0;
3756}
3757
3758static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3759 __acquires(rcu)
3760{
3761 struct net *net = seq_file_net(f);
3762 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3763
3764 rcu_read_lock();
3765 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3766}
3767
3768static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3769{
3770 struct net *net = seq_file_net(f);
3771 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3772
3773 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3774}
3775
3776static void pfkey_seq_stop(struct seq_file *f, void *v)
3777 __releases(rcu)
3778{
3779 rcu_read_unlock();
3780}
3781
3782static const struct seq_operations pfkey_seq_ops = {
3783 .start = pfkey_seq_start,
3784 .next = pfkey_seq_next,
3785 .stop = pfkey_seq_stop,
3786 .show = pfkey_seq_show,
3787};
3788
3789static int pfkey_seq_open(struct inode *inode, struct file *file)
3790{
3791 return seq_open_net(inode, file, &pfkey_seq_ops,
3792 sizeof(struct seq_net_private));
3793}
3794
3795static const struct file_operations pfkey_proc_ops = {
3796 .open = pfkey_seq_open,
3797 .read = seq_read,
3798 .llseek = seq_lseek,
3799 .release = seq_release_net,
3800};
3801
3802static int __net_init pfkey_init_proc(struct net *net)
3803{
3804 struct proc_dir_entry *e;
3805
3806 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3807 if (e == NULL)
3808 return -ENOMEM;
3809
3810 return 0;
3811}
3812
3813static void __net_exit pfkey_exit_proc(struct net *net)
3814{
3815 remove_proc_entry("pfkey", net->proc_net);
3816}
3817#else
3818static inline int pfkey_init_proc(struct net *net)
3819{
3820 return 0;
3821}
3822
3823static inline void pfkey_exit_proc(struct net *net)
3824{
3825}
3826#endif
3827
3828static struct xfrm_mgr pfkeyv2_mgr =
3829{
3830 .id = "pfkeyv2",
3831 .notify = pfkey_send_notify,
3832 .acquire = pfkey_send_acquire,
3833 .compile_policy = pfkey_compile_policy,
3834 .new_mapping = pfkey_send_new_mapping,
3835 .notify_policy = pfkey_send_policy_notify,
3836 .migrate = pfkey_send_migrate,
3837 .is_alive = pfkey_is_alive,
3838};
3839
3840static int __net_init pfkey_net_init(struct net *net)
3841{
3842 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3843 int rv;
3844
3845 INIT_HLIST_HEAD(&net_pfkey->table);
3846 atomic_set(&net_pfkey->socks_nr, 0);
3847
3848 rv = pfkey_init_proc(net);
3849
3850 return rv;
3851}
3852
3853static void __net_exit pfkey_net_exit(struct net *net)
3854{
3855 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3856
3857 pfkey_exit_proc(net);
3858 BUG_ON(!hlist_empty(&net_pfkey->table));
3859}
3860
3861static struct pernet_operations pfkey_net_ops = {
3862 .init = pfkey_net_init,
3863 .exit = pfkey_net_exit,
3864 .id = &pfkey_net_id,
3865 .size = sizeof(struct netns_pfkey),
3866};
3867
3868static void __exit ipsec_pfkey_exit(void)
3869{
3870 xfrm_unregister_km(&pfkeyv2_mgr);
3871 sock_unregister(PF_KEY);
3872 unregister_pernet_subsys(&pfkey_net_ops);
3873 proto_unregister(&key_proto);
3874}
3875
3876static int __init ipsec_pfkey_init(void)
3877{
3878 int err = proto_register(&key_proto, 0);
3879
3880 if (err != 0)
3881 goto out;
3882
3883 err = register_pernet_subsys(&pfkey_net_ops);
3884 if (err != 0)
3885 goto out_unregister_key_proto;
3886 err = sock_register(&pfkey_family_ops);
3887 if (err != 0)
3888 goto out_unregister_pernet;
3889 err = xfrm_register_km(&pfkeyv2_mgr);
3890 if (err != 0)
3891 goto out_sock_unregister;
3892out:
3893 return err;
3894
3895out_sock_unregister:
3896 sock_unregister(PF_KEY);
3897out_unregister_pernet:
3898 unregister_pernet_subsys(&pfkey_net_ops);
3899out_unregister_key_proto:
3900 proto_unregister(&key_proto);
3901 goto out;
3902}
3903
3904module_init(ipsec_pfkey_init);
3905module_exit(ipsec_pfkey_exit);
3906MODULE_LICENSE("GPL");
3907MODULE_ALIAS_NETPROTO(PF_KEY);
3908
