Merge tag 'pxa-dt-4.21' of https://github.com/rjarzmik/linux into next/dt
[muen/linux.git] / net / key / af_key.c
1 /*
2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
3  *
4  *              This program is free software; you can redistribute it and/or
5  *              modify it under the terms of the GNU General Public License
6  *              as published by the Free Software Foundation; either version
7  *              2 of the License, or (at your option) any later version.
8  *
9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
10  *              David S. Miller <davem@redhat.com>
11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14  *              Derek Atkins <derek@ihtfp.com>
15  */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static unsigned int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41         /* List of all pfkey sockets. */
42         struct hlist_head table;
43         atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static const struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50         /* struct sock must be the first member of struct pfkey_sock */
51         struct sock     sk;
52         int             registered;
53         int             promisc;
54
55         struct {
56                 uint8_t         msg_version;
57                 uint32_t        msg_portid;
58                 int             (*dump)(struct pfkey_sock *sk);
59                 void            (*done)(struct pfkey_sock *sk);
60                 union {
61                         struct xfrm_policy_walk policy;
62                         struct xfrm_state_walk  state;
63                 } u;
64                 struct sk_buff  *skb;
65         } dump;
66         struct mutex dump_lock;
67 };
68
69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
70                                xfrm_address_t *saddr, xfrm_address_t *daddr,
71                                u16 *family);
72
73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
74 {
75         return (struct pfkey_sock *)sk;
76 }
77
78 static 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
85 static 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
98 static 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(refcount_read(&sk->sk_wmem_alloc));
113
114         atomic_dec(&net_pfkey->socks_nr);
115 }
116
117 static const struct proto_ops pfkey_ops;
118
119 static 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
129 static 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
136 static struct proto key_proto = {
137         .name     = "KEY",
138         .owner    = THIS_MODULE,
139         .obj_size = sizeof(struct pfkey_sock),
140 };
141
142 static 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;
176 out:
177         return err;
178 }
179
180 static 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
199 static 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 (refcount_read(&skb->users) != 1) {
207                         *skb2 = skb_clone(skb, allocation);
208                 } else {
209                         *skb2 = skb;
210                         refcount_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 /* Send SKB to all pfkey sockets matching selected criteria.  */
227 #define BROADCAST_ALL           0
228 #define BROADCAST_ONE           1
229 #define BROADCAST_REGISTERED    2
230 #define BROADCAST_PROMISC_ONLY  4
231 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
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         /* XXX Do we need something like netlink_overrun?  I think
241          * XXX PF_KEY socket apps will not mind current behavior.
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                 /* Yes, it means that if you are meant to receive this
252                  * pfkey message you receive it twice as promiscuous
253                  * socket.
254                  */
255                 if (pfk->promisc)
256                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
257
258                 /* the exact target will be processed later */
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                 /* Error is cleared after successful sending to at least one
274                  * registered KM */
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, allocation, one_sk);
282
283         kfree_skb(skb2);
284         kfree_skb(skb);
285         return err;
286 }
287
288 static 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, GFP_ATOMIC, BROADCAST_ONE,
315                                 &pfk->sk, sock_net(&pfk->sk));
316                 pfk->dump.skb = NULL;
317         }
318
319         pfkey_terminate_dump(pfk);
320
321 out:
322         mutex_unlock(&pfk->dump_lock);
323         return rc;
324 }
325
326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
327                                  const struct sadb_msg *orig)
328 {
329         *new = *orig;
330 }
331
332 static 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         /* Woe be to the platform trying to support PFKEY yet
341          * having normal errnos outside the 1-255 range, inclusive.
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 = 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, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
359
360         return 0;
361 }
362
363 static 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 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
394 static 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         if (sp->sadb_address_len <
405             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
406                          sizeof(uint64_t)))
407                 return -EINVAL;
408
409         switch (addr->sa_family) {
410         case AF_INET:
411                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
412                 if (sp->sadb_address_len != len ||
413                     sp->sadb_address_prefixlen > 32)
414                         return -EINVAL;
415                 break;
416 #if IS_ENABLED(CONFIG_IPV6)
417         case AF_INET6:
418                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
419                 if (sp->sadb_address_len != len ||
420                     sp->sadb_address_prefixlen > 128)
421                         return -EINVAL;
422                 break;
423 #endif
424         default:
425                 /* It is user using kernel to keep track of security
426                  * associations for another protocol, such as
427                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
428                  * lengths.
429                  *
430                  * XXX Actually, association/policy database is not yet
431                  * XXX able to cope with arbitrary sockaddr families.
432                  * XXX When it can, remove this -EINVAL.  -DaveM
433                  */
434                 return -EINVAL;
435         }
436
437         return 0;
438 }
439
440 static inline int sadb_key_len(const struct sadb_key *key)
441 {
442         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
443
444         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
445                             sizeof(uint64_t));
446 }
447
448 static int verify_key_len(const void *p)
449 {
450         const struct sadb_key *key = p;
451
452         if (sadb_key_len(key) > key->sadb_key_len)
453                 return -EINVAL;
454
455         return 0;
456 }
457
458 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
459 {
460         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
461                             sec_ctx->sadb_x_ctx_len,
462                             sizeof(uint64_t));
463 }
464
465 static inline int verify_sec_ctx_len(const void *p)
466 {
467         const struct sadb_x_sec_ctx *sec_ctx = p;
468         int len = sec_ctx->sadb_x_ctx_len;
469
470         if (len > PAGE_SIZE)
471                 return -EINVAL;
472
473         len = pfkey_sec_ctx_len(sec_ctx);
474
475         if (sec_ctx->sadb_x_sec_len != len)
476                 return -EINVAL;
477
478         return 0;
479 }
480
481 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
482                                                                      gfp_t gfp)
483 {
484         struct xfrm_user_sec_ctx *uctx = NULL;
485         int ctx_size = sec_ctx->sadb_x_ctx_len;
486
487         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
488
489         if (!uctx)
490                 return NULL;
491
492         uctx->len = pfkey_sec_ctx_len(sec_ctx);
493         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
494         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
495         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
496         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
497         memcpy(uctx + 1, sec_ctx + 1,
498                uctx->ctx_len);
499
500         return uctx;
501 }
502
503 static int present_and_same_family(const struct sadb_address *src,
504                                    const struct sadb_address *dst)
505 {
506         const struct sockaddr *s_addr, *d_addr;
507
508         if (!src || !dst)
509                 return 0;
510
511         s_addr = (const struct sockaddr *)(src + 1);
512         d_addr = (const struct sockaddr *)(dst + 1);
513         if (s_addr->sa_family != d_addr->sa_family)
514                 return 0;
515         if (s_addr->sa_family != AF_INET
516 #if IS_ENABLED(CONFIG_IPV6)
517             && s_addr->sa_family != AF_INET6
518 #endif
519                 )
520                 return 0;
521
522         return 1;
523 }
524
525 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
526 {
527         const char *p = (char *) hdr;
528         int len = skb->len;
529
530         len -= sizeof(*hdr);
531         p += sizeof(*hdr);
532         while (len > 0) {
533                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
534                 uint16_t ext_type;
535                 int ext_len;
536
537                 if (len < sizeof(*ehdr))
538                         return -EINVAL;
539
540                 ext_len  = ehdr->sadb_ext_len;
541                 ext_len *= sizeof(uint64_t);
542                 ext_type = ehdr->sadb_ext_type;
543                 if (ext_len < sizeof(uint64_t) ||
544                     ext_len > len ||
545                     ext_type == SADB_EXT_RESERVED)
546                         return -EINVAL;
547
548                 if (ext_type <= SADB_EXT_MAX) {
549                         int min = (int) sadb_ext_min_len[ext_type];
550                         if (ext_len < min)
551                                 return -EINVAL;
552                         if (ext_hdrs[ext_type-1] != NULL)
553                                 return -EINVAL;
554                         switch (ext_type) {
555                         case SADB_EXT_ADDRESS_SRC:
556                         case SADB_EXT_ADDRESS_DST:
557                         case SADB_EXT_ADDRESS_PROXY:
558                         case SADB_X_EXT_NAT_T_OA:
559                                 if (verify_address_len(p))
560                                         return -EINVAL;
561                                 break;
562                         case SADB_X_EXT_SEC_CTX:
563                                 if (verify_sec_ctx_len(p))
564                                         return -EINVAL;
565                                 break;
566                         case SADB_EXT_KEY_AUTH:
567                         case SADB_EXT_KEY_ENCRYPT:
568                                 if (verify_key_len(p))
569                                         return -EINVAL;
570                                 break;
571                         default:
572                                 break;
573                         }
574                         ext_hdrs[ext_type-1] = (void *) p;
575                 }
576                 p   += ext_len;
577                 len -= ext_len;
578         }
579
580         return 0;
581 }
582
583 static uint16_t
584 pfkey_satype2proto(uint8_t satype)
585 {
586         switch (satype) {
587         case SADB_SATYPE_UNSPEC:
588                 return IPSEC_PROTO_ANY;
589         case SADB_SATYPE_AH:
590                 return IPPROTO_AH;
591         case SADB_SATYPE_ESP:
592                 return IPPROTO_ESP;
593         case SADB_X_SATYPE_IPCOMP:
594                 return IPPROTO_COMP;
595         default:
596                 return 0;
597         }
598         /* NOTREACHED */
599 }
600
601 static uint8_t
602 pfkey_proto2satype(uint16_t proto)
603 {
604         switch (proto) {
605         case IPPROTO_AH:
606                 return SADB_SATYPE_AH;
607         case IPPROTO_ESP:
608                 return SADB_SATYPE_ESP;
609         case IPPROTO_COMP:
610                 return SADB_X_SATYPE_IPCOMP;
611         default:
612                 return 0;
613         }
614         /* NOTREACHED */
615 }
616
617 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
618  * say specifically 'just raw sockets' as we encode them as 255.
619  */
620
621 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
622 {
623         return proto == IPSEC_PROTO_ANY ? 0 : proto;
624 }
625
626 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
627 {
628         return proto ? proto : IPSEC_PROTO_ANY;
629 }
630
631 static inline int pfkey_sockaddr_len(sa_family_t family)
632 {
633         switch (family) {
634         case AF_INET:
635                 return sizeof(struct sockaddr_in);
636 #if IS_ENABLED(CONFIG_IPV6)
637         case AF_INET6:
638                 return sizeof(struct sockaddr_in6);
639 #endif
640         }
641         return 0;
642 }
643
644 static
645 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
646 {
647         switch (sa->sa_family) {
648         case AF_INET:
649                 xaddr->a4 =
650                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
651                 return AF_INET;
652 #if IS_ENABLED(CONFIG_IPV6)
653         case AF_INET6:
654                 memcpy(xaddr->a6,
655                        &((struct sockaddr_in6 *)sa)->sin6_addr,
656                        sizeof(struct in6_addr));
657                 return AF_INET6;
658 #endif
659         }
660         return 0;
661 }
662
663 static
664 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
665 {
666         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
667                                       xaddr);
668 }
669
670 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
671 {
672         const struct sadb_sa *sa;
673         const struct sadb_address *addr;
674         uint16_t proto;
675         unsigned short family;
676         xfrm_address_t *xaddr;
677
678         sa = ext_hdrs[SADB_EXT_SA - 1];
679         if (sa == NULL)
680                 return NULL;
681
682         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
683         if (proto == 0)
684                 return NULL;
685
686         /* sadb_address_len should be checked by caller */
687         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
688         if (addr == NULL)
689                 return NULL;
690
691         family = ((const struct sockaddr *)(addr + 1))->sa_family;
692         switch (family) {
693         case AF_INET:
694                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
695                 break;
696 #if IS_ENABLED(CONFIG_IPV6)
697         case AF_INET6:
698                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
699                 break;
700 #endif
701         default:
702                 xaddr = NULL;
703         }
704
705         if (!xaddr)
706                 return NULL;
707
708         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
709 }
710
711 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
712
713 static int
714 pfkey_sockaddr_size(sa_family_t family)
715 {
716         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
717 }
718
719 static inline int pfkey_mode_from_xfrm(int mode)
720 {
721         switch(mode) {
722         case XFRM_MODE_TRANSPORT:
723                 return IPSEC_MODE_TRANSPORT;
724         case XFRM_MODE_TUNNEL:
725                 return IPSEC_MODE_TUNNEL;
726         case XFRM_MODE_BEET:
727                 return IPSEC_MODE_BEET;
728         default:
729                 return -1;
730         }
731 }
732
733 static inline int pfkey_mode_to_xfrm(int mode)
734 {
735         switch(mode) {
736         case IPSEC_MODE_ANY:    /*XXX*/
737         case IPSEC_MODE_TRANSPORT:
738                 return XFRM_MODE_TRANSPORT;
739         case IPSEC_MODE_TUNNEL:
740                 return XFRM_MODE_TUNNEL;
741         case IPSEC_MODE_BEET:
742                 return XFRM_MODE_BEET;
743         default:
744                 return -1;
745         }
746 }
747
748 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
749                                         struct sockaddr *sa,
750                                         unsigned short family)
751 {
752         switch (family) {
753         case AF_INET:
754             {
755                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
756                 sin->sin_family = AF_INET;
757                 sin->sin_port = port;
758                 sin->sin_addr.s_addr = xaddr->a4;
759                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
760                 return 32;
761             }
762 #if IS_ENABLED(CONFIG_IPV6)
763         case AF_INET6:
764             {
765                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
766                 sin6->sin6_family = AF_INET6;
767                 sin6->sin6_port = port;
768                 sin6->sin6_flowinfo = 0;
769                 sin6->sin6_addr = xaddr->in6;
770                 sin6->sin6_scope_id = 0;
771                 return 128;
772             }
773 #endif
774         }
775         return 0;
776 }
777
778 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
779                                               int add_keys, int hsc)
780 {
781         struct sk_buff *skb;
782         struct sadb_msg *hdr;
783         struct sadb_sa *sa;
784         struct sadb_lifetime *lifetime;
785         struct sadb_address *addr;
786         struct sadb_key *key;
787         struct sadb_x_sa2 *sa2;
788         struct sadb_x_sec_ctx *sec_ctx;
789         struct xfrm_sec_ctx *xfrm_ctx;
790         int ctx_size = 0;
791         int size;
792         int auth_key_size = 0;
793         int encrypt_key_size = 0;
794         int sockaddr_size;
795         struct xfrm_encap_tmpl *natt = NULL;
796         int mode;
797
798         /* address family check */
799         sockaddr_size = pfkey_sockaddr_size(x->props.family);
800         if (!sockaddr_size)
801                 return ERR_PTR(-EINVAL);
802
803         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
804            key(AE), (identity(SD),) (sensitivity)> */
805         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
806                 sizeof(struct sadb_lifetime) +
807                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
808                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
809                         sizeof(struct sadb_address)*2 +
810                                 sockaddr_size*2 +
811                                         sizeof(struct sadb_x_sa2);
812
813         if ((xfrm_ctx = x->security)) {
814                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
815                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
816         }
817
818         /* identity & sensitivity */
819         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
820                 size += sizeof(struct sadb_address) + sockaddr_size;
821
822         if (add_keys) {
823                 if (x->aalg && x->aalg->alg_key_len) {
824                         auth_key_size =
825                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
826                         size += sizeof(struct sadb_key) + auth_key_size;
827                 }
828                 if (x->ealg && x->ealg->alg_key_len) {
829                         encrypt_key_size =
830                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
831                         size += sizeof(struct sadb_key) + encrypt_key_size;
832                 }
833         }
834         if (x->encap)
835                 natt = x->encap;
836
837         if (natt && natt->encap_type) {
838                 size += sizeof(struct sadb_x_nat_t_type);
839                 size += sizeof(struct sadb_x_nat_t_port);
840                 size += sizeof(struct sadb_x_nat_t_port);
841         }
842
843         skb =  alloc_skb(size + 16, GFP_ATOMIC);
844         if (skb == NULL)
845                 return ERR_PTR(-ENOBUFS);
846
847         /* call should fill header later */
848         hdr = skb_put(skb, sizeof(struct sadb_msg));
849         memset(hdr, 0, size);   /* XXX do we need this ? */
850         hdr->sadb_msg_len = size / sizeof(uint64_t);
851
852         /* sa */
853         sa = skb_put(skb, sizeof(struct sadb_sa));
854         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
855         sa->sadb_sa_exttype = SADB_EXT_SA;
856         sa->sadb_sa_spi = x->id.spi;
857         sa->sadb_sa_replay = x->props.replay_window;
858         switch (x->km.state) {
859         case XFRM_STATE_VALID:
860                 sa->sadb_sa_state = x->km.dying ?
861                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
862                 break;
863         case XFRM_STATE_ACQ:
864                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
865                 break;
866         default:
867                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
868                 break;
869         }
870         sa->sadb_sa_auth = 0;
871         if (x->aalg) {
872                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
873                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
874                                         a->desc.sadb_alg_id : 0;
875         }
876         sa->sadb_sa_encrypt = 0;
877         BUG_ON(x->ealg && x->calg);
878         if (x->ealg) {
879                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
880                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
881                                         a->desc.sadb_alg_id : 0;
882         }
883         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
884         if (x->calg) {
885                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
886                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
887                                         a->desc.sadb_alg_id : 0;
888         }
889
890         sa->sadb_sa_flags = 0;
891         if (x->props.flags & XFRM_STATE_NOECN)
892                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
893         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
894                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
895         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
896                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
897
898         /* hard time */
899         if (hsc & 2) {
900                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
901                 lifetime->sadb_lifetime_len =
902                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
903                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
904                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
905                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
906                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
907                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
908         }
909         /* soft time */
910         if (hsc & 1) {
911                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
912                 lifetime->sadb_lifetime_len =
913                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
914                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
915                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
916                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
917                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
918                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
919         }
920         /* current time */
921         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
922         lifetime->sadb_lifetime_len =
923                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
924         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
925         lifetime->sadb_lifetime_allocations = x->curlft.packets;
926         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
927         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
928         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
929         /* src address */
930         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
931         addr->sadb_address_len =
932                 (sizeof(struct sadb_address)+sockaddr_size)/
933                         sizeof(uint64_t);
934         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
935         /* "if the ports are non-zero, then the sadb_address_proto field,
936            normally zero, MUST be filled in with the transport
937            protocol's number." - RFC2367 */
938         addr->sadb_address_proto = 0;
939         addr->sadb_address_reserved = 0;
940
941         addr->sadb_address_prefixlen =
942                 pfkey_sockaddr_fill(&x->props.saddr, 0,
943                                     (struct sockaddr *) (addr + 1),
944                                     x->props.family);
945         if (!addr->sadb_address_prefixlen)
946                 BUG();
947
948         /* dst address */
949         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
950         addr->sadb_address_len =
951                 (sizeof(struct sadb_address)+sockaddr_size)/
952                         sizeof(uint64_t);
953         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
954         addr->sadb_address_proto = 0;
955         addr->sadb_address_reserved = 0;
956
957         addr->sadb_address_prefixlen =
958                 pfkey_sockaddr_fill(&x->id.daddr, 0,
959                                     (struct sockaddr *) (addr + 1),
960                                     x->props.family);
961         if (!addr->sadb_address_prefixlen)
962                 BUG();
963
964         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
965                              x->props.family)) {
966                 addr = skb_put(skb,
967                                sizeof(struct sadb_address) + sockaddr_size);
968                 addr->sadb_address_len =
969                         (sizeof(struct sadb_address)+sockaddr_size)/
970                         sizeof(uint64_t);
971                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
972                 addr->sadb_address_proto =
973                         pfkey_proto_from_xfrm(x->sel.proto);
974                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
975                 addr->sadb_address_reserved = 0;
976
977                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
978                                     (struct sockaddr *) (addr + 1),
979                                     x->props.family);
980         }
981
982         /* auth key */
983         if (add_keys && auth_key_size) {
984                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
985                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
986                         sizeof(uint64_t);
987                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
988                 key->sadb_key_bits = x->aalg->alg_key_len;
989                 key->sadb_key_reserved = 0;
990                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
991         }
992         /* encrypt key */
993         if (add_keys && encrypt_key_size) {
994                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
995                 key->sadb_key_len = (sizeof(struct sadb_key) +
996                                      encrypt_key_size) / sizeof(uint64_t);
997                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
998                 key->sadb_key_bits = x->ealg->alg_key_len;
999                 key->sadb_key_reserved = 0;
1000                 memcpy(key + 1, x->ealg->alg_key,
1001                        (x->ealg->alg_key_len+7)/8);
1002         }
1003
1004         /* sa */
1005         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
1006         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1007         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1008         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1009                 kfree_skb(skb);
1010                 return ERR_PTR(-EINVAL);
1011         }
1012         sa2->sadb_x_sa2_mode = mode;
1013         sa2->sadb_x_sa2_reserved1 = 0;
1014         sa2->sadb_x_sa2_reserved2 = 0;
1015         sa2->sadb_x_sa2_sequence = 0;
1016         sa2->sadb_x_sa2_reqid = x->props.reqid;
1017
1018         if (natt && natt->encap_type) {
1019                 struct sadb_x_nat_t_type *n_type;
1020                 struct sadb_x_nat_t_port *n_port;
1021
1022                 /* type */
1023                 n_type = skb_put(skb, sizeof(*n_type));
1024                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1025                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1026                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1027                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1028                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1029                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1030
1031                 /* source port */
1032                 n_port = skb_put(skb, sizeof(*n_port));
1033                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1034                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1035                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1036                 n_port->sadb_x_nat_t_port_reserved = 0;
1037
1038                 /* dest port */
1039                 n_port = skb_put(skb, sizeof(*n_port));
1040                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1041                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1042                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1043                 n_port->sadb_x_nat_t_port_reserved = 0;
1044         }
1045
1046         /* security context */
1047         if (xfrm_ctx) {
1048                 sec_ctx = skb_put(skb,
1049                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1050                 sec_ctx->sadb_x_sec_len =
1051                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1052                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1053                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1054                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1055                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1056                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1057                        xfrm_ctx->ctx_len);
1058         }
1059
1060         return skb;
1061 }
1062
1063
1064 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1065 {
1066         struct sk_buff *skb;
1067
1068         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1069
1070         return skb;
1071 }
1072
1073 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1074                                                           int hsc)
1075 {
1076         return __pfkey_xfrm_state2msg(x, 0, hsc);
1077 }
1078
1079 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1080                                                 const struct sadb_msg *hdr,
1081                                                 void * const *ext_hdrs)
1082 {
1083         struct xfrm_state *x;
1084         const struct sadb_lifetime *lifetime;
1085         const struct sadb_sa *sa;
1086         const struct sadb_key *key;
1087         const struct sadb_x_sec_ctx *sec_ctx;
1088         uint16_t proto;
1089         int err;
1090
1091
1092         sa = ext_hdrs[SADB_EXT_SA - 1];
1093         if (!sa ||
1094             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1095                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1096                 return ERR_PTR(-EINVAL);
1097         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1098             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1099                 return ERR_PTR(-EINVAL);
1100         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1101             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1102                 return ERR_PTR(-EINVAL);
1103         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1104             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1105                 return ERR_PTR(-EINVAL);
1106
1107         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1108         if (proto == 0)
1109                 return ERR_PTR(-EINVAL);
1110
1111         /* default error is no buffer space */
1112         err = -ENOBUFS;
1113
1114         /* RFC2367:
1115
1116    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1117    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1118    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1119    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1120    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1121    not true.
1122
1123            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1124            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1125          */
1126         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1127             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1128              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1129             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1130                 return ERR_PTR(-EINVAL);
1131         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1132         if (key != NULL &&
1133             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1134             key->sadb_key_bits == 0)
1135                 return ERR_PTR(-EINVAL);
1136         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1137         if (key != NULL &&
1138             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1139             key->sadb_key_bits == 0)
1140                 return ERR_PTR(-EINVAL);
1141
1142         x = xfrm_state_alloc(net);
1143         if (x == NULL)
1144                 return ERR_PTR(-ENOBUFS);
1145
1146         x->id.proto = proto;
1147         x->id.spi = sa->sadb_sa_spi;
1148         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1149                                         (sizeof(x->replay.bitmap) * 8));
1150         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1151                 x->props.flags |= XFRM_STATE_NOECN;
1152         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1153                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1154         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1155                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1156
1157         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1158         if (lifetime != NULL) {
1159                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1160                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1161                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1162                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1163         }
1164         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1165         if (lifetime != NULL) {
1166                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1167                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1168                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1169                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1170         }
1171
1172         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1173         if (sec_ctx != NULL) {
1174                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1175
1176                 if (!uctx)
1177                         goto out;
1178
1179                 err = security_xfrm_state_alloc(x, uctx);
1180                 kfree(uctx);
1181
1182                 if (err)
1183                         goto out;
1184         }
1185
1186         err = -ENOBUFS;
1187         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1188         if (sa->sadb_sa_auth) {
1189                 int keysize = 0;
1190                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1191                 if (!a || !a->pfkey_supported) {
1192                         err = -ENOSYS;
1193                         goto out;
1194                 }
1195                 if (key)
1196                         keysize = (key->sadb_key_bits + 7) / 8;
1197                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1198                 if (!x->aalg) {
1199                         err = -ENOMEM;
1200                         goto out;
1201                 }
1202                 strcpy(x->aalg->alg_name, a->name);
1203                 x->aalg->alg_key_len = 0;
1204                 if (key) {
1205                         x->aalg->alg_key_len = key->sadb_key_bits;
1206                         memcpy(x->aalg->alg_key, key+1, keysize);
1207                 }
1208                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1209                 x->props.aalgo = sa->sadb_sa_auth;
1210                 /* x->algo.flags = sa->sadb_sa_flags; */
1211         }
1212         if (sa->sadb_sa_encrypt) {
1213                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1214                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1215                         if (!a || !a->pfkey_supported) {
1216                                 err = -ENOSYS;
1217                                 goto out;
1218                         }
1219                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1220                         if (!x->calg) {
1221                                 err = -ENOMEM;
1222                                 goto out;
1223                         }
1224                         strcpy(x->calg->alg_name, a->name);
1225                         x->props.calgo = sa->sadb_sa_encrypt;
1226                 } else {
1227                         int keysize = 0;
1228                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1229                         if (!a || !a->pfkey_supported) {
1230                                 err = -ENOSYS;
1231                                 goto out;
1232                         }
1233                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1234                         if (key)
1235                                 keysize = (key->sadb_key_bits + 7) / 8;
1236                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1237                         if (!x->ealg) {
1238                                 err = -ENOMEM;
1239                                 goto out;
1240                         }
1241                         strcpy(x->ealg->alg_name, a->name);
1242                         x->ealg->alg_key_len = 0;
1243                         if (key) {
1244                                 x->ealg->alg_key_len = key->sadb_key_bits;
1245                                 memcpy(x->ealg->alg_key, key+1, keysize);
1246                         }
1247                         x->props.ealgo = sa->sadb_sa_encrypt;
1248                         x->geniv = a->uinfo.encr.geniv;
1249                 }
1250         }
1251         /* x->algo.flags = sa->sadb_sa_flags; */
1252
1253         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1254                                                     &x->props.saddr);
1255         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1256                                   &x->id.daddr);
1257
1258         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1259                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1260                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1261                 if (mode < 0) {
1262                         err = -EINVAL;
1263                         goto out;
1264                 }
1265                 x->props.mode = mode;
1266                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1267         }
1268
1269         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1270                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1271
1272                 /* Nobody uses this, but we try. */
1273                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1274                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1275         }
1276
1277         if (!x->sel.family)
1278                 x->sel.family = x->props.family;
1279
1280         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1281                 const struct sadb_x_nat_t_type* n_type;
1282                 struct xfrm_encap_tmpl *natt;
1283
1284                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1285                 if (!x->encap) {
1286                         err = -ENOMEM;
1287                         goto out;
1288                 }
1289
1290                 natt = x->encap;
1291                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1292                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1293
1294                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1295                         const struct sadb_x_nat_t_port *n_port =
1296                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1297                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1298                 }
1299                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1300                         const struct sadb_x_nat_t_port *n_port =
1301                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1302                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1303                 }
1304                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1305         }
1306
1307         err = xfrm_init_state(x);
1308         if (err)
1309                 goto out;
1310
1311         x->km.seq = hdr->sadb_msg_seq;
1312         return x;
1313
1314 out:
1315         x->km.state = XFRM_STATE_DEAD;
1316         xfrm_state_put(x);
1317         return ERR_PTR(err);
1318 }
1319
1320 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1321 {
1322         return -EOPNOTSUPP;
1323 }
1324
1325 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1326 {
1327         struct net *net = sock_net(sk);
1328         struct sk_buff *resp_skb;
1329         struct sadb_x_sa2 *sa2;
1330         struct sadb_address *saddr, *daddr;
1331         struct sadb_msg *out_hdr;
1332         struct sadb_spirange *range;
1333         struct xfrm_state *x = NULL;
1334         int mode;
1335         int err;
1336         u32 min_spi, max_spi;
1337         u32 reqid;
1338         u8 proto;
1339         unsigned short family;
1340         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1341
1342         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1343                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1344                 return -EINVAL;
1345
1346         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1347         if (proto == 0)
1348                 return -EINVAL;
1349
1350         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1351                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1352                 if (mode < 0)
1353                         return -EINVAL;
1354                 reqid = sa2->sadb_x_sa2_reqid;
1355         } else {
1356                 mode = 0;
1357                 reqid = 0;
1358         }
1359
1360         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1361         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1362
1363         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1364         switch (family) {
1365         case AF_INET:
1366                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1367                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1368                 break;
1369 #if IS_ENABLED(CONFIG_IPV6)
1370         case AF_INET6:
1371                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1372                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1373                 break;
1374 #endif
1375         }
1376
1377         if (hdr->sadb_msg_seq) {
1378                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1380                         xfrm_state_put(x);
1381                         x = NULL;
1382                 }
1383         }
1384
1385         if (!x)
1386                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1387
1388         if (x == NULL)
1389                 return -ENOENT;
1390
1391         min_spi = 0x100;
1392         max_spi = 0x0fffffff;
1393
1394         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1395         if (range) {
1396                 min_spi = range->sadb_spirange_min;
1397                 max_spi = range->sadb_spirange_max;
1398         }
1399
1400         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1401         if (err) {
1402                 xfrm_state_put(x);
1403                 return err;
1404         }
1405
1406         err = xfrm_alloc_spi(x, min_spi, max_spi);
1407         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1408
1409         if (IS_ERR(resp_skb)) {
1410                 xfrm_state_put(x);
1411                 return  PTR_ERR(resp_skb);
1412         }
1413
1414         out_hdr = (struct sadb_msg *) resp_skb->data;
1415         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1416         out_hdr->sadb_msg_type = SADB_GETSPI;
1417         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1418         out_hdr->sadb_msg_errno = 0;
1419         out_hdr->sadb_msg_reserved = 0;
1420         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1421         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1422
1423         xfrm_state_put(x);
1424
1425         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1426
1427         return 0;
1428 }
1429
1430 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1431 {
1432         struct net *net = sock_net(sk);
1433         struct xfrm_state *x;
1434
1435         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1436                 return -EOPNOTSUPP;
1437
1438         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1439                 return 0;
1440
1441         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1442         if (x == NULL)
1443                 return 0;
1444
1445         spin_lock_bh(&x->lock);
1446         if (x->km.state == XFRM_STATE_ACQ)
1447                 x->km.state = XFRM_STATE_ERROR;
1448
1449         spin_unlock_bh(&x->lock);
1450         xfrm_state_put(x);
1451         return 0;
1452 }
1453
1454 static inline int event2poltype(int event)
1455 {
1456         switch (event) {
1457         case XFRM_MSG_DELPOLICY:
1458                 return SADB_X_SPDDELETE;
1459         case XFRM_MSG_NEWPOLICY:
1460                 return SADB_X_SPDADD;
1461         case XFRM_MSG_UPDPOLICY:
1462                 return SADB_X_SPDUPDATE;
1463         case XFRM_MSG_POLEXPIRE:
1464         //      return SADB_X_SPDEXPIRE;
1465         default:
1466                 pr_err("pfkey: Unknown policy event %d\n", event);
1467                 break;
1468         }
1469
1470         return 0;
1471 }
1472
1473 static inline int event2keytype(int event)
1474 {
1475         switch (event) {
1476         case XFRM_MSG_DELSA:
1477                 return SADB_DELETE;
1478         case XFRM_MSG_NEWSA:
1479                 return SADB_ADD;
1480         case XFRM_MSG_UPDSA:
1481                 return SADB_UPDATE;
1482         case XFRM_MSG_EXPIRE:
1483                 return SADB_EXPIRE;
1484         default:
1485                 pr_err("pfkey: Unknown SA event %d\n", event);
1486                 break;
1487         }
1488
1489         return 0;
1490 }
1491
1492 /* ADD/UPD/DEL */
1493 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1494 {
1495         struct sk_buff *skb;
1496         struct sadb_msg *hdr;
1497
1498         skb = pfkey_xfrm_state2msg(x);
1499
1500         if (IS_ERR(skb))
1501                 return PTR_ERR(skb);
1502
1503         hdr = (struct sadb_msg *) skb->data;
1504         hdr->sadb_msg_version = PF_KEY_V2;
1505         hdr->sadb_msg_type = event2keytype(c->event);
1506         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1507         hdr->sadb_msg_errno = 0;
1508         hdr->sadb_msg_reserved = 0;
1509         hdr->sadb_msg_seq = c->seq;
1510         hdr->sadb_msg_pid = c->portid;
1511
1512         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1513
1514         return 0;
1515 }
1516
1517 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1518 {
1519         struct net *net = sock_net(sk);
1520         struct xfrm_state *x;
1521         int err;
1522         struct km_event c;
1523
1524         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1525         if (IS_ERR(x))
1526                 return PTR_ERR(x);
1527
1528         xfrm_state_hold(x);
1529         if (hdr->sadb_msg_type == SADB_ADD)
1530                 err = xfrm_state_add(x);
1531         else
1532                 err = xfrm_state_update(x);
1533
1534         xfrm_audit_state_add(x, err ? 0 : 1, true);
1535
1536         if (err < 0) {
1537                 x->km.state = XFRM_STATE_DEAD;
1538                 __xfrm_state_put(x);
1539                 goto out;
1540         }
1541
1542         if (hdr->sadb_msg_type == SADB_ADD)
1543                 c.event = XFRM_MSG_NEWSA;
1544         else
1545                 c.event = XFRM_MSG_UPDSA;
1546         c.seq = hdr->sadb_msg_seq;
1547         c.portid = hdr->sadb_msg_pid;
1548         km_state_notify(x, &c);
1549 out:
1550         xfrm_state_put(x);
1551         return err;
1552 }
1553
1554 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1555 {
1556         struct net *net = sock_net(sk);
1557         struct xfrm_state *x;
1558         struct km_event c;
1559         int err;
1560
1561         if (!ext_hdrs[SADB_EXT_SA-1] ||
1562             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1563                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1564                 return -EINVAL;
1565
1566         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1567         if (x == NULL)
1568                 return -ESRCH;
1569
1570         if ((err = security_xfrm_state_delete(x)))
1571                 goto out;
1572
1573         if (xfrm_state_kern(x)) {
1574                 err = -EPERM;
1575                 goto out;
1576         }
1577
1578         err = xfrm_state_delete(x);
1579
1580         if (err < 0)
1581                 goto out;
1582
1583         c.seq = hdr->sadb_msg_seq;
1584         c.portid = hdr->sadb_msg_pid;
1585         c.event = XFRM_MSG_DELSA;
1586         km_state_notify(x, &c);
1587 out:
1588         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1589         xfrm_state_put(x);
1590
1591         return err;
1592 }
1593
1594 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1595 {
1596         struct net *net = sock_net(sk);
1597         __u8 proto;
1598         struct sk_buff *out_skb;
1599         struct sadb_msg *out_hdr;
1600         struct xfrm_state *x;
1601
1602         if (!ext_hdrs[SADB_EXT_SA-1] ||
1603             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1604                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1605                 return -EINVAL;
1606
1607         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1608         if (x == NULL)
1609                 return -ESRCH;
1610
1611         out_skb = pfkey_xfrm_state2msg(x);
1612         proto = x->id.proto;
1613         xfrm_state_put(x);
1614         if (IS_ERR(out_skb))
1615                 return  PTR_ERR(out_skb);
1616
1617         out_hdr = (struct sadb_msg *) out_skb->data;
1618         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1619         out_hdr->sadb_msg_type = SADB_GET;
1620         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1621         out_hdr->sadb_msg_errno = 0;
1622         out_hdr->sadb_msg_reserved = 0;
1623         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1624         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1625         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1626
1627         return 0;
1628 }
1629
1630 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1631                                               gfp_t allocation)
1632 {
1633         struct sk_buff *skb;
1634         struct sadb_msg *hdr;
1635         int len, auth_len, enc_len, i;
1636
1637         auth_len = xfrm_count_pfkey_auth_supported();
1638         if (auth_len) {
1639                 auth_len *= sizeof(struct sadb_alg);
1640                 auth_len += sizeof(struct sadb_supported);
1641         }
1642
1643         enc_len = xfrm_count_pfkey_enc_supported();
1644         if (enc_len) {
1645                 enc_len *= sizeof(struct sadb_alg);
1646                 enc_len += sizeof(struct sadb_supported);
1647         }
1648
1649         len = enc_len + auth_len + sizeof(struct sadb_msg);
1650
1651         skb = alloc_skb(len + 16, allocation);
1652         if (!skb)
1653                 goto out_put_algs;
1654
1655         hdr = skb_put(skb, sizeof(*hdr));
1656         pfkey_hdr_dup(hdr, orig);
1657         hdr->sadb_msg_errno = 0;
1658         hdr->sadb_msg_len = len / sizeof(uint64_t);
1659
1660         if (auth_len) {
1661                 struct sadb_supported *sp;
1662                 struct sadb_alg *ap;
1663
1664                 sp = skb_put(skb, auth_len);
1665                 ap = (struct sadb_alg *) (sp + 1);
1666
1667                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1668                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1669
1670                 for (i = 0; ; i++) {
1671                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1672                         if (!aalg)
1673                                 break;
1674                         if (!aalg->pfkey_supported)
1675                                 continue;
1676                         if (aalg->available)
1677                                 *ap++ = aalg->desc;
1678                 }
1679         }
1680
1681         if (enc_len) {
1682                 struct sadb_supported *sp;
1683                 struct sadb_alg *ap;
1684
1685                 sp = skb_put(skb, enc_len);
1686                 ap = (struct sadb_alg *) (sp + 1);
1687
1688                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1689                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1690
1691                 for (i = 0; ; i++) {
1692                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1693                         if (!ealg)
1694                                 break;
1695                         if (!ealg->pfkey_supported)
1696                                 continue;
1697                         if (ealg->available)
1698                                 *ap++ = ealg->desc;
1699                 }
1700         }
1701
1702 out_put_algs:
1703         return skb;
1704 }
1705
1706 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1707 {
1708         struct pfkey_sock *pfk = pfkey_sk(sk);
1709         struct sk_buff *supp_skb;
1710
1711         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1712                 return -EINVAL;
1713
1714         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1715                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1716                         return -EEXIST;
1717                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1718         }
1719
1720         xfrm_probe_algs();
1721
1722         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1723         if (!supp_skb) {
1724                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1725                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1726
1727                 return -ENOBUFS;
1728         }
1729
1730         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1731                         sock_net(sk));
1732         return 0;
1733 }
1734
1735 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1736 {
1737         struct sk_buff *skb;
1738         struct sadb_msg *hdr;
1739
1740         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1741         if (!skb)
1742                 return -ENOBUFS;
1743
1744         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1745         hdr->sadb_msg_errno = (uint8_t) 0;
1746         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1747
1748         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1749                                sock_net(sk));
1750 }
1751
1752 static int key_notify_sa_flush(const struct km_event *c)
1753 {
1754         struct sk_buff *skb;
1755         struct sadb_msg *hdr;
1756
1757         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1758         if (!skb)
1759                 return -ENOBUFS;
1760         hdr = skb_put(skb, sizeof(struct sadb_msg));
1761         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1762         hdr->sadb_msg_type = SADB_FLUSH;
1763         hdr->sadb_msg_seq = c->seq;
1764         hdr->sadb_msg_pid = c->portid;
1765         hdr->sadb_msg_version = PF_KEY_V2;
1766         hdr->sadb_msg_errno = (uint8_t) 0;
1767         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1768         hdr->sadb_msg_reserved = 0;
1769
1770         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1771
1772         return 0;
1773 }
1774
1775 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1776 {
1777         struct net *net = sock_net(sk);
1778         unsigned int proto;
1779         struct km_event c;
1780         int err, err2;
1781
1782         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1783         if (proto == 0)
1784                 return -EINVAL;
1785
1786         err = xfrm_state_flush(net, proto, true);
1787         err2 = unicast_flush_resp(sk, hdr);
1788         if (err || err2) {
1789                 if (err == -ESRCH) /* empty table - go quietly */
1790                         err = 0;
1791                 return err ? err : err2;
1792         }
1793
1794         c.data.proto = proto;
1795         c.seq = hdr->sadb_msg_seq;
1796         c.portid = hdr->sadb_msg_pid;
1797         c.event = XFRM_MSG_FLUSHSA;
1798         c.net = net;
1799         km_state_notify(NULL, &c);
1800
1801         return 0;
1802 }
1803
1804 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1805 {
1806         struct pfkey_sock *pfk = ptr;
1807         struct sk_buff *out_skb;
1808         struct sadb_msg *out_hdr;
1809
1810         if (!pfkey_can_dump(&pfk->sk))
1811                 return -ENOBUFS;
1812
1813         out_skb = pfkey_xfrm_state2msg(x);
1814         if (IS_ERR(out_skb))
1815                 return PTR_ERR(out_skb);
1816
1817         out_hdr = (struct sadb_msg *) out_skb->data;
1818         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1819         out_hdr->sadb_msg_type = SADB_DUMP;
1820         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1821         out_hdr->sadb_msg_errno = 0;
1822         out_hdr->sadb_msg_reserved = 0;
1823         out_hdr->sadb_msg_seq = count + 1;
1824         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1825
1826         if (pfk->dump.skb)
1827                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1828                                 &pfk->sk, sock_net(&pfk->sk));
1829         pfk->dump.skb = out_skb;
1830
1831         return 0;
1832 }
1833
1834 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1835 {
1836         struct net *net = sock_net(&pfk->sk);
1837         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1838 }
1839
1840 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1841 {
1842         struct net *net = sock_net(&pfk->sk);
1843
1844         xfrm_state_walk_done(&pfk->dump.u.state, net);
1845 }
1846
1847 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1848 {
1849         u8 proto;
1850         struct xfrm_address_filter *filter = NULL;
1851         struct pfkey_sock *pfk = pfkey_sk(sk);
1852
1853         mutex_lock(&pfk->dump_lock);
1854         if (pfk->dump.dump != NULL) {
1855                 mutex_unlock(&pfk->dump_lock);
1856                 return -EBUSY;
1857         }
1858
1859         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1860         if (proto == 0) {
1861                 mutex_unlock(&pfk->dump_lock);
1862                 return -EINVAL;
1863         }
1864
1865         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1866                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1867
1868                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1869                 if (filter == NULL) {
1870                         mutex_unlock(&pfk->dump_lock);
1871                         return -ENOMEM;
1872                 }
1873
1874                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1875                        sizeof(xfrm_address_t));
1876                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1877                        sizeof(xfrm_address_t));
1878                 filter->family = xfilter->sadb_x_filter_family;
1879                 filter->splen = xfilter->sadb_x_filter_splen;
1880                 filter->dplen = xfilter->sadb_x_filter_dplen;
1881         }
1882
1883         pfk->dump.msg_version = hdr->sadb_msg_version;
1884         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1885         pfk->dump.dump = pfkey_dump_sa;
1886         pfk->dump.done = pfkey_dump_sa_done;
1887         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1888         mutex_unlock(&pfk->dump_lock);
1889
1890         return pfkey_do_dump(pfk);
1891 }
1892
1893 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1894 {
1895         struct pfkey_sock *pfk = pfkey_sk(sk);
1896         int satype = hdr->sadb_msg_satype;
1897         bool reset_errno = false;
1898
1899         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1900                 reset_errno = true;
1901                 if (satype != 0 && satype != 1)
1902                         return -EINVAL;
1903                 pfk->promisc = satype;
1904         }
1905         if (reset_errno && skb_cloned(skb))
1906                 skb = skb_copy(skb, GFP_KERNEL);
1907         else
1908                 skb = skb_clone(skb, GFP_KERNEL);
1909
1910         if (reset_errno && skb) {
1911                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1912                 new_hdr->sadb_msg_errno = 0;
1913         }
1914
1915         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1916         return 0;
1917 }
1918
1919 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1920 {
1921         int i;
1922         u32 reqid = *(u32*)ptr;
1923
1924         for (i=0; i<xp->xfrm_nr; i++) {
1925                 if (xp->xfrm_vec[i].reqid == reqid)
1926                         return -EEXIST;
1927         }
1928         return 0;
1929 }
1930
1931 static u32 gen_reqid(struct net *net)
1932 {
1933         struct xfrm_policy_walk walk;
1934         u32 start;
1935         int rc;
1936         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1937
1938         start = reqid;
1939         do {
1940                 ++reqid;
1941                 if (reqid == 0)
1942                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1943                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1944                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1945                 xfrm_policy_walk_done(&walk, net);
1946                 if (rc != -EEXIST)
1947                         return reqid;
1948         } while (reqid != start);
1949         return 0;
1950 }
1951
1952 static int
1953 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1954 {
1955         struct net *net = xp_net(xp);
1956         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1957         int mode;
1958
1959         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1960                 return -ELOOP;
1961
1962         if (rq->sadb_x_ipsecrequest_mode == 0)
1963                 return -EINVAL;
1964
1965         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1966         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1967                 return -EINVAL;
1968         t->mode = mode;
1969         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1970                 t->optional = 1;
1971         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1972                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1973                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1974                         t->reqid = 0;
1975                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1976                         return -ENOBUFS;
1977         }
1978
1979         /* addresses present only in tunnel mode */
1980         if (t->mode == XFRM_MODE_TUNNEL) {
1981                 int err;
1982
1983                 err = parse_sockaddr_pair(
1984                         (struct sockaddr *)(rq + 1),
1985                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1986                         &t->saddr, &t->id.daddr, &t->encap_family);
1987                 if (err)
1988                         return err;
1989         } else
1990                 t->encap_family = xp->family;
1991
1992         /* No way to set this via kame pfkey */
1993         t->allalgs = 1;
1994         xp->xfrm_nr++;
1995         return 0;
1996 }
1997
1998 static int
1999 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2000 {
2001         int err;
2002         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2003         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2004
2005         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2006                 return -EINVAL;
2007
2008         while (len >= sizeof(*rq)) {
2009                 if (len < rq->sadb_x_ipsecrequest_len ||
2010                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2011                         return -EINVAL;
2012
2013                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2014                         return err;
2015                 len -= rq->sadb_x_ipsecrequest_len;
2016                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2017         }
2018         return 0;
2019 }
2020
2021 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2022 {
2023   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2024
2025         if (xfrm_ctx) {
2026                 int len = sizeof(struct sadb_x_sec_ctx);
2027                 len += xfrm_ctx->ctx_len;
2028                 return PFKEY_ALIGN8(len);
2029         }
2030         return 0;
2031 }
2032
2033 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2034 {
2035         const struct xfrm_tmpl *t;
2036         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2037         int socklen = 0;
2038         int i;
2039
2040         for (i=0; i<xp->xfrm_nr; i++) {
2041                 t = xp->xfrm_vec + i;
2042                 socklen += pfkey_sockaddr_len(t->encap_family);
2043         }
2044
2045         return sizeof(struct sadb_msg) +
2046                 (sizeof(struct sadb_lifetime) * 3) +
2047                 (sizeof(struct sadb_address) * 2) +
2048                 (sockaddr_size * 2) +
2049                 sizeof(struct sadb_x_policy) +
2050                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2051                 (socklen * 2) +
2052                 pfkey_xfrm_policy2sec_ctx_size(xp);
2053 }
2054
2055 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2056 {
2057         struct sk_buff *skb;
2058         int size;
2059
2060         size = pfkey_xfrm_policy2msg_size(xp);
2061
2062         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2063         if (skb == NULL)
2064                 return ERR_PTR(-ENOBUFS);
2065
2066         return skb;
2067 }
2068
2069 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2070 {
2071         struct sadb_msg *hdr;
2072         struct sadb_address *addr;
2073         struct sadb_lifetime *lifetime;
2074         struct sadb_x_policy *pol;
2075         struct sadb_x_sec_ctx *sec_ctx;
2076         struct xfrm_sec_ctx *xfrm_ctx;
2077         int i;
2078         int size;
2079         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2080         int socklen = pfkey_sockaddr_len(xp->family);
2081
2082         size = pfkey_xfrm_policy2msg_size(xp);
2083
2084         /* call should fill header later */
2085         hdr = skb_put(skb, sizeof(struct sadb_msg));
2086         memset(hdr, 0, size);   /* XXX do we need this ? */
2087
2088         /* src address */
2089         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2090         addr->sadb_address_len =
2091                 (sizeof(struct sadb_address)+sockaddr_size)/
2092                         sizeof(uint64_t);
2093         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2094         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2095         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2096         addr->sadb_address_reserved = 0;
2097         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2098                                  xp->selector.sport,
2099                                  (struct sockaddr *) (addr + 1),
2100                                  xp->family))
2101                 BUG();
2102
2103         /* dst address */
2104         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2105         addr->sadb_address_len =
2106                 (sizeof(struct sadb_address)+sockaddr_size)/
2107                         sizeof(uint64_t);
2108         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2109         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2110         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2111         addr->sadb_address_reserved = 0;
2112
2113         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2114                             (struct sockaddr *) (addr + 1),
2115                             xp->family);
2116
2117         /* hard time */
2118         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2119         lifetime->sadb_lifetime_len =
2120                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2121         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2122         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2123         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2124         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2125         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2126         /* soft time */
2127         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2128         lifetime->sadb_lifetime_len =
2129                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2130         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2131         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2132         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2133         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2134         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2135         /* current time */
2136         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2137         lifetime->sadb_lifetime_len =
2138                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2139         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2140         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2141         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2142         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2143         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2144
2145         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2146         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2147         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2148         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2149         if (xp->action == XFRM_POLICY_ALLOW) {
2150                 if (xp->xfrm_nr)
2151                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2152                 else
2153                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2154         }
2155         pol->sadb_x_policy_dir = dir+1;
2156         pol->sadb_x_policy_reserved = 0;
2157         pol->sadb_x_policy_id = xp->index;
2158         pol->sadb_x_policy_priority = xp->priority;
2159
2160         for (i=0; i<xp->xfrm_nr; i++) {
2161                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2162                 struct sadb_x_ipsecrequest *rq;
2163                 int req_size;
2164                 int mode;
2165
2166                 req_size = sizeof(struct sadb_x_ipsecrequest);
2167                 if (t->mode == XFRM_MODE_TUNNEL) {
2168                         socklen = pfkey_sockaddr_len(t->encap_family);
2169                         req_size += socklen * 2;
2170                 } else {
2171                         size -= 2*socklen;
2172                 }
2173                 rq = skb_put(skb, req_size);
2174                 pol->sadb_x_policy_len += req_size/8;
2175                 memset(rq, 0, sizeof(*rq));
2176                 rq->sadb_x_ipsecrequest_len = req_size;
2177                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2178                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2179                         return -EINVAL;
2180                 rq->sadb_x_ipsecrequest_mode = mode;
2181                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2182                 if (t->reqid)
2183                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2184                 if (t->optional)
2185                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2186                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2187
2188                 if (t->mode == XFRM_MODE_TUNNEL) {
2189                         u8 *sa = (void *)(rq + 1);
2190                         pfkey_sockaddr_fill(&t->saddr, 0,
2191                                             (struct sockaddr *)sa,
2192                                             t->encap_family);
2193                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2194                                             (struct sockaddr *) (sa + socklen),
2195                                             t->encap_family);
2196                 }
2197         }
2198
2199         /* security context */
2200         if ((xfrm_ctx = xp->security)) {
2201                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2202
2203                 sec_ctx = skb_put(skb, ctx_size);
2204                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2205                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2206                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2207                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2208                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2209                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2210                        xfrm_ctx->ctx_len);
2211         }
2212
2213         hdr->sadb_msg_len = size / sizeof(uint64_t);
2214         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2215
2216         return 0;
2217 }
2218
2219 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2220 {
2221         struct sk_buff *out_skb;
2222         struct sadb_msg *out_hdr;
2223         int err;
2224
2225         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2226         if (IS_ERR(out_skb))
2227                 return PTR_ERR(out_skb);
2228
2229         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2230         if (err < 0) {
2231                 kfree_skb(out_skb);
2232                 return err;
2233         }
2234
2235         out_hdr = (struct sadb_msg *) out_skb->data;
2236         out_hdr->sadb_msg_version = PF_KEY_V2;
2237
2238         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2239                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2240         else
2241                 out_hdr->sadb_msg_type = event2poltype(c->event);
2242         out_hdr->sadb_msg_errno = 0;
2243         out_hdr->sadb_msg_seq = c->seq;
2244         out_hdr->sadb_msg_pid = c->portid;
2245         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2246         return 0;
2247
2248 }
2249
2250 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2251 {
2252         struct net *net = sock_net(sk);
2253         int err = 0;
2254         struct sadb_lifetime *lifetime;
2255         struct sadb_address *sa;
2256         struct sadb_x_policy *pol;
2257         struct xfrm_policy *xp;
2258         struct km_event c;
2259         struct sadb_x_sec_ctx *sec_ctx;
2260
2261         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2262                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2263             !ext_hdrs[SADB_X_EXT_POLICY-1])
2264                 return -EINVAL;
2265
2266         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2267         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2268                 return -EINVAL;
2269         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2270                 return -EINVAL;
2271
2272         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2273         if (xp == NULL)
2274                 return -ENOBUFS;
2275
2276         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2277                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2278         xp->priority = pol->sadb_x_policy_priority;
2279
2280         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2281         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2282         xp->selector.family = xp->family;
2283         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2284         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2285         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2286         if (xp->selector.sport)
2287                 xp->selector.sport_mask = htons(0xffff);
2288
2289         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2290         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2291         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2292
2293         /* Amusing, we set this twice.  KAME apps appear to set same value
2294          * in both addresses.
2295          */
2296         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2297
2298         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2299         if (xp->selector.dport)
2300                 xp->selector.dport_mask = htons(0xffff);
2301
2302         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2303         if (sec_ctx != NULL) {
2304                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2305
2306                 if (!uctx) {
2307                         err = -ENOBUFS;
2308                         goto out;
2309                 }
2310
2311                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2312                 kfree(uctx);
2313
2314                 if (err)
2315                         goto out;
2316         }
2317
2318         xp->lft.soft_byte_limit = XFRM_INF;
2319         xp->lft.hard_byte_limit = XFRM_INF;
2320         xp->lft.soft_packet_limit = XFRM_INF;
2321         xp->lft.hard_packet_limit = XFRM_INF;
2322         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2323                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2324                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2325                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2326                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2327         }
2328         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2329                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2330                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2331                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2332                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2333         }
2334         xp->xfrm_nr = 0;
2335         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2336             (err = parse_ipsecrequests(xp, pol)) < 0)
2337                 goto out;
2338
2339         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2340                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2341
2342         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2343
2344         if (err)
2345                 goto out;
2346
2347         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2348                 c.event = XFRM_MSG_UPDPOLICY;
2349         else
2350                 c.event = XFRM_MSG_NEWPOLICY;
2351
2352         c.seq = hdr->sadb_msg_seq;
2353         c.portid = hdr->sadb_msg_pid;
2354
2355         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2356         xfrm_pol_put(xp);
2357         return 0;
2358
2359 out:
2360         xp->walk.dead = 1;
2361         xfrm_policy_destroy(xp);
2362         return err;
2363 }
2364
2365 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2366 {
2367         struct net *net = sock_net(sk);
2368         int err;
2369         struct sadb_address *sa;
2370         struct sadb_x_policy *pol;
2371         struct xfrm_policy *xp;
2372         struct xfrm_selector sel;
2373         struct km_event c;
2374         struct sadb_x_sec_ctx *sec_ctx;
2375         struct xfrm_sec_ctx *pol_ctx = NULL;
2376
2377         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2378                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2379             !ext_hdrs[SADB_X_EXT_POLICY-1])
2380                 return -EINVAL;
2381
2382         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2383         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2384                 return -EINVAL;
2385
2386         memset(&sel, 0, sizeof(sel));
2387
2388         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2389         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2390         sel.prefixlen_s = sa->sadb_address_prefixlen;
2391         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393         if (sel.sport)
2394                 sel.sport_mask = htons(0xffff);
2395
2396         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2397         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2398         sel.prefixlen_d = sa->sadb_address_prefixlen;
2399         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2400         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2401         if (sel.dport)
2402                 sel.dport_mask = htons(0xffff);
2403
2404         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2405         if (sec_ctx != NULL) {
2406                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2407
2408                 if (!uctx)
2409                         return -ENOMEM;
2410
2411                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2412                 kfree(uctx);
2413                 if (err)
2414                         return err;
2415         }
2416
2417         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2418                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2419                                    1, &err);
2420         security_xfrm_policy_free(pol_ctx);
2421         if (xp == NULL)
2422                 return -ENOENT;
2423
2424         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2425
2426         if (err)
2427                 goto out;
2428
2429         c.seq = hdr->sadb_msg_seq;
2430         c.portid = hdr->sadb_msg_pid;
2431         c.data.byid = 0;
2432         c.event = XFRM_MSG_DELPOLICY;
2433         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2434
2435 out:
2436         xfrm_pol_put(xp);
2437         return err;
2438 }
2439
2440 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2441 {
2442         int err;
2443         struct sk_buff *out_skb;
2444         struct sadb_msg *out_hdr;
2445         err = 0;
2446
2447         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2448         if (IS_ERR(out_skb)) {
2449                 err =  PTR_ERR(out_skb);
2450                 goto out;
2451         }
2452         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2453         if (err < 0)
2454                 goto out;
2455
2456         out_hdr = (struct sadb_msg *) out_skb->data;
2457         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2458         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2459         out_hdr->sadb_msg_satype = 0;
2460         out_hdr->sadb_msg_errno = 0;
2461         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2462         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2463         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2464         err = 0;
2465
2466 out:
2467         return err;
2468 }
2469
2470 static int pfkey_sockaddr_pair_size(sa_family_t family)
2471 {
2472         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2473 }
2474
2475 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2476                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2477                                u16 *family)
2478 {
2479         int af, socklen;
2480
2481         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2482                 return -EINVAL;
2483
2484         af = pfkey_sockaddr_extract(sa, saddr);
2485         if (!af)
2486                 return -EINVAL;
2487
2488         socklen = pfkey_sockaddr_len(af);
2489         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2490                                    daddr) != af)
2491                 return -EINVAL;
2492
2493         *family = af;
2494         return 0;
2495 }
2496
2497 #ifdef CONFIG_NET_KEY_MIGRATE
2498 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2499                                     struct xfrm_migrate *m)
2500 {
2501         int err;
2502         struct sadb_x_ipsecrequest *rq2;
2503         int mode;
2504
2505         if (len < sizeof(*rq1) ||
2506             len < rq1->sadb_x_ipsecrequest_len ||
2507             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2508                 return -EINVAL;
2509
2510         /* old endoints */
2511         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2512                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2513                                   &m->old_saddr, &m->old_daddr,
2514                                   &m->old_family);
2515         if (err)
2516                 return err;
2517
2518         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2519         len -= rq1->sadb_x_ipsecrequest_len;
2520
2521         if (len <= sizeof(*rq2) ||
2522             len < rq2->sadb_x_ipsecrequest_len ||
2523             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2524                 return -EINVAL;
2525
2526         /* new endpoints */
2527         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2528                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2529                                   &m->new_saddr, &m->new_daddr,
2530                                   &m->new_family);
2531         if (err)
2532                 return err;
2533
2534         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2535             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2536             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2537                 return -EINVAL;
2538
2539         m->proto = rq1->sadb_x_ipsecrequest_proto;
2540         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2541                 return -EINVAL;
2542         m->mode = mode;
2543         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2544
2545         return ((int)(rq1->sadb_x_ipsecrequest_len +
2546                       rq2->sadb_x_ipsecrequest_len));
2547 }
2548
2549 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2550                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2551 {
2552         int i, len, ret, err = -EINVAL;
2553         u8 dir;
2554         struct sadb_address *sa;
2555         struct sadb_x_kmaddress *kma;
2556         struct sadb_x_policy *pol;
2557         struct sadb_x_ipsecrequest *rq;
2558         struct xfrm_selector sel;
2559         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2560         struct xfrm_kmaddress k;
2561         struct net *net = sock_net(sk);
2562
2563         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2564                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2565             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2566                 err = -EINVAL;
2567                 goto out;
2568         }
2569
2570         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2571         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2572
2573         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2574                 err = -EINVAL;
2575                 goto out;
2576         }
2577
2578         if (kma) {
2579                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2580                 k.reserved = kma->sadb_x_kmaddress_reserved;
2581                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2582                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2583                                           &k.local, &k.remote, &k.family);
2584                 if (ret < 0) {
2585                         err = ret;
2586                         goto out;
2587                 }
2588         }
2589
2590         dir = pol->sadb_x_policy_dir - 1;
2591         memset(&sel, 0, sizeof(sel));
2592
2593         /* set source address info of selector */
2594         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2595         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2596         sel.prefixlen_s = sa->sadb_address_prefixlen;
2597         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2598         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2599         if (sel.sport)
2600                 sel.sport_mask = htons(0xffff);
2601
2602         /* set destination address info of selector */
2603         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2604         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2605         sel.prefixlen_d = sa->sadb_address_prefixlen;
2606         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2607         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2608         if (sel.dport)
2609                 sel.dport_mask = htons(0xffff);
2610
2611         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2612
2613         /* extract ipsecrequests */
2614         i = 0;
2615         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2616
2617         while (len > 0 && i < XFRM_MAX_DEPTH) {
2618                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2619                 if (ret < 0) {
2620                         err = ret;
2621                         goto out;
2622                 } else {
2623                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2624                         len -= ret;
2625                         i++;
2626                 }
2627         }
2628
2629         if (!i || len > 0) {
2630                 err = -EINVAL;
2631                 goto out;
2632         }
2633
2634         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2635                             kma ? &k : NULL, net, NULL);
2636
2637  out:
2638         return err;
2639 }
2640 #else
2641 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2642                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2643 {
2644         return -ENOPROTOOPT;
2645 }
2646 #endif
2647
2648
2649 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2650 {
2651         struct net *net = sock_net(sk);
2652         unsigned int dir;
2653         int err = 0, delete;
2654         struct sadb_x_policy *pol;
2655         struct xfrm_policy *xp;
2656         struct km_event c;
2657
2658         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2659                 return -EINVAL;
2660
2661         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2662         if (dir >= XFRM_POLICY_MAX)
2663                 return -EINVAL;
2664
2665         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2666         xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2667                               dir, pol->sadb_x_policy_id, delete, &err);
2668         if (xp == NULL)
2669                 return -ENOENT;
2670
2671         if (delete) {
2672                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2673
2674                 if (err)
2675                         goto out;
2676                 c.seq = hdr->sadb_msg_seq;
2677                 c.portid = hdr->sadb_msg_pid;
2678                 c.data.byid = 1;
2679                 c.event = XFRM_MSG_DELPOLICY;
2680                 km_policy_notify(xp, dir, &c);
2681         } else {
2682                 err = key_pol_get_resp(sk, xp, hdr, dir);
2683         }
2684
2685 out:
2686         xfrm_pol_put(xp);
2687         return err;
2688 }
2689
2690 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2691 {
2692         struct pfkey_sock *pfk = ptr;
2693         struct sk_buff *out_skb;
2694         struct sadb_msg *out_hdr;
2695         int err;
2696
2697         if (!pfkey_can_dump(&pfk->sk))
2698                 return -ENOBUFS;
2699
2700         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2701         if (IS_ERR(out_skb))
2702                 return PTR_ERR(out_skb);
2703
2704         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2705         if (err < 0)
2706                 return err;
2707
2708         out_hdr = (struct sadb_msg *) out_skb->data;
2709         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2710         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2711         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2712         out_hdr->sadb_msg_errno = 0;
2713         out_hdr->sadb_msg_seq = count + 1;
2714         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2715
2716         if (pfk->dump.skb)
2717                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2718                                 &pfk->sk, sock_net(&pfk->sk));
2719         pfk->dump.skb = out_skb;
2720
2721         return 0;
2722 }
2723
2724 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2725 {
2726         struct net *net = sock_net(&pfk->sk);
2727         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2728 }
2729
2730 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2731 {
2732         struct net *net = sock_net((struct sock *)pfk);
2733
2734         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2735 }
2736
2737 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2738 {
2739         struct pfkey_sock *pfk = pfkey_sk(sk);
2740
2741         mutex_lock(&pfk->dump_lock);
2742         if (pfk->dump.dump != NULL) {
2743                 mutex_unlock(&pfk->dump_lock);
2744                 return -EBUSY;
2745         }
2746
2747         pfk->dump.msg_version = hdr->sadb_msg_version;
2748         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2749         pfk->dump.dump = pfkey_dump_sp;
2750         pfk->dump.done = pfkey_dump_sp_done;
2751         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2752         mutex_unlock(&pfk->dump_lock);
2753
2754         return pfkey_do_dump(pfk);
2755 }
2756
2757 static int key_notify_policy_flush(const struct km_event *c)
2758 {
2759         struct sk_buff *skb_out;
2760         struct sadb_msg *hdr;
2761
2762         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2763         if (!skb_out)
2764                 return -ENOBUFS;
2765         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2766         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2767         hdr->sadb_msg_seq = c->seq;
2768         hdr->sadb_msg_pid = c->portid;
2769         hdr->sadb_msg_version = PF_KEY_V2;
2770         hdr->sadb_msg_errno = (uint8_t) 0;
2771         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2772         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2773         hdr->sadb_msg_reserved = 0;
2774         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2775         return 0;
2776
2777 }
2778
2779 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2780 {
2781         struct net *net = sock_net(sk);
2782         struct km_event c;
2783         int err, err2;
2784
2785         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2786         err2 = unicast_flush_resp(sk, hdr);
2787         if (err || err2) {
2788                 if (err == -ESRCH) /* empty table - old silent behavior */
2789                         return 0;
2790                 return err;
2791         }
2792
2793         c.data.type = XFRM_POLICY_TYPE_MAIN;
2794         c.event = XFRM_MSG_FLUSHPOLICY;
2795         c.portid = hdr->sadb_msg_pid;
2796         c.seq = hdr->sadb_msg_seq;
2797         c.net = net;
2798         km_policy_notify(NULL, 0, &c);
2799
2800         return 0;
2801 }
2802
2803 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2804                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2805 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2806         [SADB_RESERVED]         = pfkey_reserved,
2807         [SADB_GETSPI]           = pfkey_getspi,
2808         [SADB_UPDATE]           = pfkey_add,
2809         [SADB_ADD]              = pfkey_add,
2810         [SADB_DELETE]           = pfkey_delete,
2811         [SADB_GET]              = pfkey_get,
2812         [SADB_ACQUIRE]          = pfkey_acquire,
2813         [SADB_REGISTER]         = pfkey_register,
2814         [SADB_EXPIRE]           = NULL,
2815         [SADB_FLUSH]            = pfkey_flush,
2816         [SADB_DUMP]             = pfkey_dump,
2817         [SADB_X_PROMISC]        = pfkey_promisc,
2818         [SADB_X_PCHANGE]        = NULL,
2819         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2820         [SADB_X_SPDADD]         = pfkey_spdadd,
2821         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2822         [SADB_X_SPDGET]         = pfkey_spdget,
2823         [SADB_X_SPDACQUIRE]     = NULL,
2824         [SADB_X_SPDDUMP]        = pfkey_spddump,
2825         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2826         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2827         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2828         [SADB_X_MIGRATE]        = pfkey_migrate,
2829 };
2830
2831 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2832 {
2833         void *ext_hdrs[SADB_EXT_MAX];
2834         int err;
2835
2836         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2837                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2838
2839         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2840         err = parse_exthdrs(skb, hdr, ext_hdrs);
2841         if (!err) {
2842                 err = -EOPNOTSUPP;
2843                 if (pfkey_funcs[hdr->sadb_msg_type])
2844                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2845         }
2846         return err;
2847 }
2848
2849 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2850 {
2851         struct sadb_msg *hdr = NULL;
2852
2853         if (skb->len < sizeof(*hdr)) {
2854                 *errp = -EMSGSIZE;
2855         } else {
2856                 hdr = (struct sadb_msg *) skb->data;
2857                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2858                     hdr->sadb_msg_reserved != 0 ||
2859                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2860                      hdr->sadb_msg_type > SADB_MAX)) {
2861                         hdr = NULL;
2862                         *errp = -EINVAL;
2863                 } else if (hdr->sadb_msg_len != (skb->len /
2864                                                  sizeof(uint64_t)) ||
2865                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2866                                                 sizeof(uint64_t))) {
2867                         hdr = NULL;
2868                         *errp = -EMSGSIZE;
2869                 } else {
2870                         *errp = 0;
2871                 }
2872         }
2873         return hdr;
2874 }
2875
2876 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2877                                 const struct xfrm_algo_desc *d)
2878 {
2879         unsigned int id = d->desc.sadb_alg_id;
2880
2881         if (id >= sizeof(t->aalgos) * 8)
2882                 return 0;
2883
2884         return (t->aalgos >> id) & 1;
2885 }
2886
2887 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2888                                 const struct xfrm_algo_desc *d)
2889 {
2890         unsigned int id = d->desc.sadb_alg_id;
2891
2892         if (id >= sizeof(t->ealgos) * 8)
2893                 return 0;
2894
2895         return (t->ealgos >> id) & 1;
2896 }
2897
2898 static int count_ah_combs(const struct xfrm_tmpl *t)
2899 {
2900         int i, sz = 0;
2901
2902         for (i = 0; ; i++) {
2903                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2904                 if (!aalg)
2905                         break;
2906                 if (!aalg->pfkey_supported)
2907                         continue;
2908                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2909                         sz += sizeof(struct sadb_comb);
2910         }
2911         return sz + sizeof(struct sadb_prop);
2912 }
2913
2914 static int count_esp_combs(const struct xfrm_tmpl *t)
2915 {
2916         int i, k, sz = 0;
2917
2918         for (i = 0; ; i++) {
2919                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920                 if (!ealg)
2921                         break;
2922
2923                 if (!ealg->pfkey_supported)
2924                         continue;
2925
2926                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927                         continue;
2928
2929                 for (k = 1; ; k++) {
2930                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931                         if (!aalg)
2932                                 break;
2933
2934                         if (!aalg->pfkey_supported)
2935                                 continue;
2936
2937                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2938                                 sz += sizeof(struct sadb_comb);
2939                 }
2940         }
2941         return sz + sizeof(struct sadb_prop);
2942 }
2943
2944 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2945 {
2946         struct sadb_prop *p;
2947         int i;
2948
2949         p = skb_put(skb, sizeof(struct sadb_prop));
2950         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2951         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2952         p->sadb_prop_replay = 32;
2953         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2954
2955         for (i = 0; ; i++) {
2956                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2957                 if (!aalg)
2958                         break;
2959
2960                 if (!aalg->pfkey_supported)
2961                         continue;
2962
2963                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2964                         struct sadb_comb *c;
2965                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2966                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2967                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2968                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2969                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2970                         c->sadb_comb_hard_addtime = 24*60*60;
2971                         c->sadb_comb_soft_addtime = 20*60*60;
2972                         c->sadb_comb_hard_usetime = 8*60*60;
2973                         c->sadb_comb_soft_usetime = 7*60*60;
2974                 }
2975         }
2976 }
2977
2978 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2979 {
2980         struct sadb_prop *p;
2981         int i, k;
2982
2983         p = skb_put(skb, sizeof(struct sadb_prop));
2984         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2985         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2986         p->sadb_prop_replay = 32;
2987         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2988
2989         for (i=0; ; i++) {
2990                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2991                 if (!ealg)
2992                         break;
2993
2994                 if (!ealg->pfkey_supported)
2995                         continue;
2996
2997                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2998                         continue;
2999
3000                 for (k = 1; ; k++) {
3001                         struct sadb_comb *c;
3002                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3003                         if (!aalg)
3004                                 break;
3005                         if (!aalg->pfkey_supported)
3006                                 continue;
3007                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3008                                 continue;
3009                         c = skb_put(skb, sizeof(struct sadb_comb));
3010                         memset(c, 0, sizeof(*c));
3011                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3012                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3013                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3014                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3015                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3016                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3017                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3018                         c->sadb_comb_hard_addtime = 24*60*60;
3019                         c->sadb_comb_soft_addtime = 20*60*60;
3020                         c->sadb_comb_hard_usetime = 8*60*60;
3021                         c->sadb_comb_soft_usetime = 7*60*60;
3022                 }
3023         }
3024 }
3025
3026 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3027 {
3028         return 0;
3029 }
3030
3031 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3032 {
3033         struct sk_buff *out_skb;
3034         struct sadb_msg *out_hdr;
3035         int hard;
3036         int hsc;
3037
3038         hard = c->data.hard;
3039         if (hard)
3040                 hsc = 2;
3041         else
3042                 hsc = 1;
3043
3044         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3045         if (IS_ERR(out_skb))
3046                 return PTR_ERR(out_skb);
3047
3048         out_hdr = (struct sadb_msg *) out_skb->data;
3049         out_hdr->sadb_msg_version = PF_KEY_V2;
3050         out_hdr->sadb_msg_type = SADB_EXPIRE;
3051         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3052         out_hdr->sadb_msg_errno = 0;
3053         out_hdr->sadb_msg_reserved = 0;
3054         out_hdr->sadb_msg_seq = 0;
3055         out_hdr->sadb_msg_pid = 0;
3056
3057         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3058                         xs_net(x));
3059         return 0;
3060 }
3061
3062 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3063 {
3064         struct net *net = x ? xs_net(x) : c->net;
3065         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3066
3067         if (atomic_read(&net_pfkey->socks_nr) == 0)
3068                 return 0;
3069
3070         switch (c->event) {
3071         case XFRM_MSG_EXPIRE:
3072                 return key_notify_sa_expire(x, c);
3073         case XFRM_MSG_DELSA:
3074         case XFRM_MSG_NEWSA:
3075         case XFRM_MSG_UPDSA:
3076                 return key_notify_sa(x, c);
3077         case XFRM_MSG_FLUSHSA:
3078                 return key_notify_sa_flush(c);
3079         case XFRM_MSG_NEWAE: /* not yet supported */
3080                 break;
3081         default:
3082                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3083                 break;
3084         }
3085
3086         return 0;
3087 }
3088
3089 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3090 {
3091         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3092                 return 0;
3093
3094         switch (c->event) {
3095         case XFRM_MSG_POLEXPIRE:
3096                 return key_notify_policy_expire(xp, c);
3097         case XFRM_MSG_DELPOLICY:
3098         case XFRM_MSG_NEWPOLICY:
3099         case XFRM_MSG_UPDPOLICY:
3100                 return key_notify_policy(xp, dir, c);
3101         case XFRM_MSG_FLUSHPOLICY:
3102                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3103                         break;
3104                 return key_notify_policy_flush(c);
3105         default:
3106                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3107                 break;
3108         }
3109
3110         return 0;
3111 }
3112
3113 static u32 get_acqseq(void)
3114 {
3115         u32 res;
3116         static atomic_t acqseq;
3117
3118         do {
3119                 res = atomic_inc_return(&acqseq);
3120         } while (!res);
3121         return res;
3122 }
3123
3124 static bool pfkey_is_alive(const struct km_event *c)
3125 {
3126         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3127         struct sock *sk;
3128         bool is_alive = false;
3129
3130         rcu_read_lock();
3131         sk_for_each_rcu(sk, &net_pfkey->table) {
3132                 if (pfkey_sk(sk)->registered) {
3133                         is_alive = true;
3134                         break;
3135                 }
3136         }
3137         rcu_read_unlock();
3138
3139         return is_alive;
3140 }
3141
3142 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3143 {
3144         struct sk_buff *skb;
3145         struct sadb_msg *hdr;
3146         struct sadb_address *addr;
3147         struct sadb_x_policy *pol;
3148         int sockaddr_size;
3149         int size;
3150         struct sadb_x_sec_ctx *sec_ctx;
3151         struct xfrm_sec_ctx *xfrm_ctx;
3152         int ctx_size = 0;
3153
3154         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3155         if (!sockaddr_size)
3156                 return -EINVAL;
3157
3158         size = sizeof(struct sadb_msg) +
3159                 (sizeof(struct sadb_address) * 2) +
3160                 (sockaddr_size * 2) +
3161                 sizeof(struct sadb_x_policy);
3162
3163         if (x->id.proto == IPPROTO_AH)
3164                 size += count_ah_combs(t);
3165         else if (x->id.proto == IPPROTO_ESP)
3166                 size += count_esp_combs(t);
3167
3168         if ((xfrm_ctx = x->security)) {
3169                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3170                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3171         }
3172
3173         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3174         if (skb == NULL)
3175                 return -ENOMEM;
3176
3177         hdr = skb_put(skb, sizeof(struct sadb_msg));
3178         hdr->sadb_msg_version = PF_KEY_V2;
3179         hdr->sadb_msg_type = SADB_ACQUIRE;
3180         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3181         hdr->sadb_msg_len = size / sizeof(uint64_t);
3182         hdr->sadb_msg_errno = 0;
3183         hdr->sadb_msg_reserved = 0;
3184         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3185         hdr->sadb_msg_pid = 0;
3186
3187         /* src address */
3188         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3189         addr->sadb_address_len =
3190                 (sizeof(struct sadb_address)+sockaddr_size)/
3191                         sizeof(uint64_t);
3192         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3193         addr->sadb_address_proto = 0;
3194         addr->sadb_address_reserved = 0;
3195         addr->sadb_address_prefixlen =
3196                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3197                                     (struct sockaddr *) (addr + 1),
3198                                     x->props.family);
3199         if (!addr->sadb_address_prefixlen)
3200                 BUG();
3201
3202         /* dst address */
3203         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3204         addr->sadb_address_len =
3205                 (sizeof(struct sadb_address)+sockaddr_size)/
3206                         sizeof(uint64_t);
3207         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3208         addr->sadb_address_proto = 0;
3209         addr->sadb_address_reserved = 0;
3210         addr->sadb_address_prefixlen =
3211                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3212                                     (struct sockaddr *) (addr + 1),
3213                                     x->props.family);
3214         if (!addr->sadb_address_prefixlen)
3215                 BUG();
3216
3217         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3218         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3219         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3220         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3221         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3222         pol->sadb_x_policy_reserved = 0;
3223         pol->sadb_x_policy_id = xp->index;
3224         pol->sadb_x_policy_priority = xp->priority;
3225
3226         /* Set sadb_comb's. */
3227         if (x->id.proto == IPPROTO_AH)
3228                 dump_ah_combs(skb, t);
3229         else if (x->id.proto == IPPROTO_ESP)
3230                 dump_esp_combs(skb, t);
3231
3232         /* security context */
3233         if (xfrm_ctx) {
3234                 sec_ctx = skb_put(skb,
3235                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3236                 sec_ctx->sadb_x_sec_len =
3237                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3238                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3239                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3240                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3241                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3242                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3243                        xfrm_ctx->ctx_len);
3244         }
3245
3246         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3247                                xs_net(x));
3248 }
3249
3250 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3251                                                 u8 *data, int len, int *dir)
3252 {
3253         struct net *net = sock_net(sk);
3254         struct xfrm_policy *xp;
3255         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3256         struct sadb_x_sec_ctx *sec_ctx;
3257
3258         switch (sk->sk_family) {
3259         case AF_INET:
3260                 if (opt != IP_IPSEC_POLICY) {
3261                         *dir = -EOPNOTSUPP;
3262                         return NULL;
3263                 }
3264                 break;
3265 #if IS_ENABLED(CONFIG_IPV6)
3266         case AF_INET6:
3267                 if (opt != IPV6_IPSEC_POLICY) {
3268                         *dir = -EOPNOTSUPP;
3269                         return NULL;
3270                 }
3271                 break;
3272 #endif
3273         default:
3274                 *dir = -EINVAL;
3275                 return NULL;
3276         }
3277
3278         *dir = -EINVAL;
3279
3280         if (len < sizeof(struct sadb_x_policy) ||
3281             pol->sadb_x_policy_len*8 > len ||
3282             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3283             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3284                 return NULL;
3285
3286         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3287         if (xp == NULL) {
3288                 *dir = -ENOBUFS;
3289                 return NULL;
3290         }
3291
3292         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3293                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3294
3295         xp->lft.soft_byte_limit = XFRM_INF;
3296         xp->lft.hard_byte_limit = XFRM_INF;
3297         xp->lft.soft_packet_limit = XFRM_INF;
3298         xp->lft.hard_packet_limit = XFRM_INF;
3299         xp->family = sk->sk_family;
3300
3301         xp->xfrm_nr = 0;
3302         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3303             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3304                 goto out;
3305
3306         /* security context too */
3307         if (len >= (pol->sadb_x_policy_len*8 +
3308             sizeof(struct sadb_x_sec_ctx))) {
3309                 char *p = (char *)pol;
3310                 struct xfrm_user_sec_ctx *uctx;
3311
3312                 p += pol->sadb_x_policy_len*8;
3313                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3314                 if (len < pol->sadb_x_policy_len*8 +
3315                     sec_ctx->sadb_x_sec_len*8) {
3316                         *dir = -EINVAL;
3317                         goto out;
3318                 }
3319                 if ((*dir = verify_sec_ctx_len(p)))
3320                         goto out;
3321                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3322                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3323                 kfree(uctx);
3324
3325                 if (*dir)
3326                         goto out;
3327         }
3328
3329         *dir = pol->sadb_x_policy_dir-1;
3330         return xp;
3331
3332 out:
3333         xp->walk.dead = 1;
3334         xfrm_policy_destroy(xp);
3335         return NULL;
3336 }
3337
3338 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3339 {
3340         struct sk_buff *skb;
3341         struct sadb_msg *hdr;
3342         struct sadb_sa *sa;
3343         struct sadb_address *addr;
3344         struct sadb_x_nat_t_port *n_port;
3345         int sockaddr_size;
3346         int size;
3347         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3348         struct xfrm_encap_tmpl *natt = NULL;
3349
3350         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3351         if (!sockaddr_size)
3352                 return -EINVAL;
3353
3354         if (!satype)
3355                 return -EINVAL;
3356
3357         if (!x->encap)
3358                 return -EINVAL;
3359
3360         natt = x->encap;
3361
3362         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3363          *
3364          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3365          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3366          */
3367
3368         size = sizeof(struct sadb_msg) +
3369                 sizeof(struct sadb_sa) +
3370                 (sizeof(struct sadb_address) * 2) +
3371                 (sockaddr_size * 2) +
3372                 (sizeof(struct sadb_x_nat_t_port) * 2);
3373
3374         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3375         if (skb == NULL)
3376                 return -ENOMEM;
3377
3378         hdr = skb_put(skb, sizeof(struct sadb_msg));
3379         hdr->sadb_msg_version = PF_KEY_V2;
3380         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3381         hdr->sadb_msg_satype = satype;
3382         hdr->sadb_msg_len = size / sizeof(uint64_t);
3383         hdr->sadb_msg_errno = 0;
3384         hdr->sadb_msg_reserved = 0;
3385         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3386         hdr->sadb_msg_pid = 0;
3387
3388         /* SA */
3389         sa = skb_put(skb, sizeof(struct sadb_sa));
3390         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3391         sa->sadb_sa_exttype = SADB_EXT_SA;
3392         sa->sadb_sa_spi = x->id.spi;
3393         sa->sadb_sa_replay = 0;
3394         sa->sadb_sa_state = 0;
3395         sa->sadb_sa_auth = 0;
3396         sa->sadb_sa_encrypt = 0;
3397         sa->sadb_sa_flags = 0;
3398
3399         /* ADDRESS_SRC (old addr) */
3400         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3401         addr->sadb_address_len =
3402                 (sizeof(struct sadb_address)+sockaddr_size)/
3403                         sizeof(uint64_t);
3404         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3405         addr->sadb_address_proto = 0;
3406         addr->sadb_address_reserved = 0;
3407         addr->sadb_address_prefixlen =
3408                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3409                                     (struct sockaddr *) (addr + 1),
3410                                     x->props.family);
3411         if (!addr->sadb_address_prefixlen)
3412                 BUG();
3413
3414         /* NAT_T_SPORT (old port) */
3415         n_port = skb_put(skb, sizeof(*n_port));
3416         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3417         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3418         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3419         n_port->sadb_x_nat_t_port_reserved = 0;
3420
3421         /* ADDRESS_DST (new addr) */
3422         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3423         addr->sadb_address_len =
3424                 (sizeof(struct sadb_address)+sockaddr_size)/
3425                         sizeof(uint64_t);
3426         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3427         addr->sadb_address_proto = 0;
3428         addr->sadb_address_reserved = 0;
3429         addr->sadb_address_prefixlen =
3430                 pfkey_sockaddr_fill(ipaddr, 0,
3431                                     (struct sockaddr *) (addr + 1),
3432                                     x->props.family);
3433         if (!addr->sadb_address_prefixlen)
3434                 BUG();
3435
3436         /* NAT_T_DPORT (new port) */
3437         n_port = skb_put(skb, sizeof(*n_port));
3438         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3439         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3440         n_port->sadb_x_nat_t_port_port = sport;
3441         n_port->sadb_x_nat_t_port_reserved = 0;
3442
3443         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3444                                xs_net(x));
3445 }
3446
3447 #ifdef CONFIG_NET_KEY_MIGRATE
3448 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3449                             const struct xfrm_selector *sel)
3450 {
3451         struct sadb_address *addr;
3452         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3453         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3454         addr->sadb_address_exttype = type;
3455         addr->sadb_address_proto = sel->proto;
3456         addr->sadb_address_reserved = 0;
3457
3458         switch (type) {
3459         case SADB_EXT_ADDRESS_SRC:
3460                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3461                 pfkey_sockaddr_fill(&sel->saddr, 0,
3462                                     (struct sockaddr *)(addr + 1),
3463                                     sel->family);
3464                 break;
3465         case SADB_EXT_ADDRESS_DST:
3466                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3467                 pfkey_sockaddr_fill(&sel->daddr, 0