xfrm: SP lookups signature with mark
[linux-2.6.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 <net/net_namespace.h>
30 #include <net/netns/generic.h>
31 #include <net/xfrm.h>
32
33 #include <net/sock.h>
34
35 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
36 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
37
38 static int pfkey_net_id __read_mostly;
39 struct netns_pfkey {
40         /* List of all pfkey sockets. */
41         struct hlist_head table;
42         atomic_t socks_nr;
43 };
44 static DEFINE_MUTEX(pfkey_mutex);
45
46 #define DUMMY_MARK 0
47 static struct xfrm_mark dummy_mark = {0, 0};
48 struct pfkey_sock {
49         /* struct sock must be the first member of struct pfkey_sock */
50         struct sock     sk;
51         int             registered;
52         int             promisc;
53
54         struct {
55                 uint8_t         msg_version;
56                 uint32_t        msg_pid;
57                 int             (*dump)(struct pfkey_sock *sk);
58                 void            (*done)(struct pfkey_sock *sk);
59                 union {
60                         struct xfrm_policy_walk policy;
61                         struct xfrm_state_walk  state;
62                 } u;
63                 struct sk_buff  *skb;
64         } dump;
65 };
66
67 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
68 {
69         return (struct pfkey_sock *)sk;
70 }
71
72 static int pfkey_can_dump(struct sock *sk)
73 {
74         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
75                 return 1;
76         return 0;
77 }
78
79 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
80 {
81         if (pfk->dump.dump) {
82                 if (pfk->dump.skb) {
83                         kfree_skb(pfk->dump.skb);
84                         pfk->dump.skb = NULL;
85                 }
86                 pfk->dump.done(pfk);
87                 pfk->dump.dump = NULL;
88                 pfk->dump.done = NULL;
89         }
90 }
91
92 static void pfkey_sock_destruct(struct sock *sk)
93 {
94         struct net *net = sock_net(sk);
95         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
96
97         pfkey_terminate_dump(pfkey_sk(sk));
98         skb_queue_purge(&sk->sk_receive_queue);
99
100         if (!sock_flag(sk, SOCK_DEAD)) {
101                 printk("Attempt to release alive pfkey socket: %p\n", sk);
102                 return;
103         }
104
105         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
106         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
107
108         atomic_dec(&net_pfkey->socks_nr);
109 }
110
111 static const struct proto_ops pfkey_ops;
112
113 static void pfkey_insert(struct sock *sk)
114 {
115         struct net *net = sock_net(sk);
116         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
117
118         mutex_lock(&pfkey_mutex);
119         sk_add_node_rcu(sk, &net_pfkey->table);
120         mutex_unlock(&pfkey_mutex);
121 }
122
123 static void pfkey_remove(struct sock *sk)
124 {
125         mutex_lock(&pfkey_mutex);
126         sk_del_node_init_rcu(sk);
127         mutex_unlock(&pfkey_mutex);
128 }
129
130 static struct proto key_proto = {
131         .name     = "KEY",
132         .owner    = THIS_MODULE,
133         .obj_size = sizeof(struct pfkey_sock),
134 };
135
136 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
137                         int kern)
138 {
139         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
140         struct sock *sk;
141         int err;
142
143         if (!capable(CAP_NET_ADMIN))
144                 return -EPERM;
145         if (sock->type != SOCK_RAW)
146                 return -ESOCKTNOSUPPORT;
147         if (protocol != PF_KEY_V2)
148                 return -EPROTONOSUPPORT;
149
150         err = -ENOMEM;
151         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
152         if (sk == NULL)
153                 goto out;
154
155         sock->ops = &pfkey_ops;
156         sock_init_data(sock, sk);
157
158         sk->sk_family = PF_KEY;
159         sk->sk_destruct = pfkey_sock_destruct;
160
161         atomic_inc(&net_pfkey->socks_nr);
162
163         pfkey_insert(sk);
164
165         return 0;
166 out:
167         return err;
168 }
169
170 static int pfkey_release(struct socket *sock)
171 {
172         struct sock *sk = sock->sk;
173
174         if (!sk)
175                 return 0;
176
177         pfkey_remove(sk);
178
179         sock_orphan(sk);
180         sock->sk = NULL;
181         skb_queue_purge(&sk->sk_write_queue);
182
183         synchronize_rcu();
184         sock_put(sk);
185
186         return 0;
187 }
188
189 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
190                                gfp_t allocation, struct sock *sk)
191 {
192         int err = -ENOBUFS;
193
194         sock_hold(sk);
195         if (*skb2 == NULL) {
196                 if (atomic_read(&skb->users) != 1) {
197                         *skb2 = skb_clone(skb, allocation);
198                 } else {
199                         *skb2 = skb;
200                         atomic_inc(&skb->users);
201                 }
202         }
203         if (*skb2 != NULL) {
204                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
205                         skb_orphan(*skb2);
206                         skb_set_owner_r(*skb2, sk);
207                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
208                         sk->sk_data_ready(sk, (*skb2)->len);
209                         *skb2 = NULL;
210                         err = 0;
211                 }
212         }
213         sock_put(sk);
214         return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria.  */
218 #define BROADCAST_ALL           0
219 #define BROADCAST_ONE           1
220 #define BROADCAST_REGISTERED    2
221 #define BROADCAST_PROMISC_ONLY  4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223                            int broadcast_flags, struct sock *one_sk,
224                            struct net *net)
225 {
226         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227         struct sock *sk;
228         struct hlist_node *node;
229         struct sk_buff *skb2 = NULL;
230         int err = -ESRCH;
231
232         /* XXX Do we need something like netlink_overrun?  I think
233          * XXX PF_KEY socket apps will not mind current behavior.
234          */
235         if (!skb)
236                 return -ENOMEM;
237
238         rcu_read_lock();
239         sk_for_each_rcu(sk, node, &net_pfkey->table) {
240                 struct pfkey_sock *pfk = pfkey_sk(sk);
241                 int err2;
242
243                 /* Yes, it means that if you are meant to receive this
244                  * pfkey message you receive it twice as promiscuous
245                  * socket.
246                  */
247                 if (pfk->promisc)
248                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
249
250                 /* the exact target will be processed later */
251                 if (sk == one_sk)
252                         continue;
253                 if (broadcast_flags != BROADCAST_ALL) {
254                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
255                                 continue;
256                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
257                             !pfk->registered)
258                                 continue;
259                         if (broadcast_flags & BROADCAST_ONE)
260                                 continue;
261                 }
262
263                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
264
265                 /* Error is cleare after succecful sending to at least one
266                  * registered KM */
267                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
268                         err = err2;
269         }
270         rcu_read_unlock();
271
272         if (one_sk != NULL)
273                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
274
275         kfree_skb(skb2);
276         kfree_skb(skb);
277         return err;
278 }
279
280 static int pfkey_do_dump(struct pfkey_sock *pfk)
281 {
282         struct sadb_msg *hdr;
283         int rc;
284
285         rc = pfk->dump.dump(pfk);
286         if (rc == -ENOBUFS)
287                 return 0;
288
289         if (pfk->dump.skb) {
290                 if (!pfkey_can_dump(&pfk->sk))
291                         return 0;
292
293                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
294                 hdr->sadb_msg_seq = 0;
295                 hdr->sadb_msg_errno = rc;
296                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
297                                 &pfk->sk, sock_net(&pfk->sk));
298                 pfk->dump.skb = NULL;
299         }
300
301         pfkey_terminate_dump(pfk);
302         return rc;
303 }
304
305 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
306 {
307         *new = *orig;
308 }
309
310 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
311 {
312         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313         struct sadb_msg *hdr;
314
315         if (!skb)
316                 return -ENOBUFS;
317
318         /* Woe be to the platform trying to support PFKEY yet
319          * having normal errnos outside the 1-255 range, inclusive.
320          */
321         err = -err;
322         if (err == ERESTARTSYS ||
323             err == ERESTARTNOHAND ||
324             err == ERESTARTNOINTR)
325                 err = EINTR;
326         if (err >= 512)
327                 err = EINVAL;
328         BUG_ON(err <= 0 || err >= 256);
329
330         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331         pfkey_hdr_dup(hdr, orig);
332         hdr->sadb_msg_errno = (uint8_t) err;
333         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334                              sizeof(uint64_t));
335
336         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338         return 0;
339 }
340
341 static u8 sadb_ext_min_len[] = {
342         [SADB_EXT_RESERVED]             = (u8) 0,
343         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
344         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
345         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
346         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
347         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
348         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
349         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
350         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
351         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
352         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
353         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
354         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
355         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
356         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
357         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
358         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
359         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
360         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
361         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
362         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
363         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
364         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
365         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
366         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
367         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
371 static int verify_address_len(void *p)
372 {
373         struct sadb_address *sp = p;
374         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
375         struct sockaddr_in *sin;
376 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
377         struct sockaddr_in6 *sin6;
378 #endif
379         int len;
380
381         switch (addr->sa_family) {
382         case AF_INET:
383                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384                 if (sp->sadb_address_len != len ||
385                     sp->sadb_address_prefixlen > 32)
386                         return -EINVAL;
387                 break;
388 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
389         case AF_INET6:
390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391                 if (sp->sadb_address_len != len ||
392                     sp->sadb_address_prefixlen > 128)
393                         return -EINVAL;
394                 break;
395 #endif
396         default:
397                 /* It is user using kernel to keep track of security
398                  * associations for another protocol, such as
399                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
400                  * lengths.
401                  *
402                  * XXX Actually, association/policy database is not yet
403                  * XXX able to cope with arbitrary sockaddr families.
404                  * XXX When it can, remove this -EINVAL.  -DaveM
405                  */
406                 return -EINVAL;
407                 break;
408         }
409
410         return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
414 {
415         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416                             sec_ctx->sadb_x_ctx_len,
417                             sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(void *p)
421 {
422         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
423         int len = sec_ctx->sadb_x_ctx_len;
424
425         if (len > PAGE_SIZE)
426                 return -EINVAL;
427
428         len = pfkey_sec_ctx_len(sec_ctx);
429
430         if (sec_ctx->sadb_x_sec_len != len)
431                 return -EINVAL;
432
433         return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
437 {
438         struct xfrm_user_sec_ctx *uctx = NULL;
439         int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443         if (!uctx)
444                 return NULL;
445
446         uctx->len = pfkey_sec_ctx_len(sec_ctx);
447         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451         memcpy(uctx + 1, sec_ctx + 1,
452                uctx->ctx_len);
453
454         return uctx;
455 }
456
457 static int present_and_same_family(struct sadb_address *src,
458                                    struct sadb_address *dst)
459 {
460         struct sockaddr *s_addr, *d_addr;
461
462         if (!src || !dst)
463                 return 0;
464
465         s_addr = (struct sockaddr *)(src + 1);
466         d_addr = (struct sockaddr *)(dst + 1);
467         if (s_addr->sa_family != d_addr->sa_family)
468                 return 0;
469         if (s_addr->sa_family != AF_INET
470 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
471             && s_addr->sa_family != AF_INET6
472 #endif
473                 )
474                 return 0;
475
476         return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
480 {
481         char *p = (char *) hdr;
482         int len = skb->len;
483
484         len -= sizeof(*hdr);
485         p += sizeof(*hdr);
486         while (len > 0) {
487                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
488                 uint16_t ext_type;
489                 int ext_len;
490
491                 ext_len  = ehdr->sadb_ext_len;
492                 ext_len *= sizeof(uint64_t);
493                 ext_type = ehdr->sadb_ext_type;
494                 if (ext_len < sizeof(uint64_t) ||
495                     ext_len > len ||
496                     ext_type == SADB_EXT_RESERVED)
497                         return -EINVAL;
498
499                 if (ext_type <= SADB_EXT_MAX) {
500                         int min = (int) sadb_ext_min_len[ext_type];
501                         if (ext_len < min)
502                                 return -EINVAL;
503                         if (ext_hdrs[ext_type-1] != NULL)
504                                 return -EINVAL;
505                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
506                             ext_type == SADB_EXT_ADDRESS_DST ||
507                             ext_type == SADB_EXT_ADDRESS_PROXY ||
508                             ext_type == SADB_X_EXT_NAT_T_OA) {
509                                 if (verify_address_len(p))
510                                         return -EINVAL;
511                         }
512                         if (ext_type == SADB_X_EXT_SEC_CTX) {
513                                 if (verify_sec_ctx_len(p))
514                                         return -EINVAL;
515                         }
516                         ext_hdrs[ext_type-1] = p;
517                 }
518                 p   += ext_len;
519                 len -= ext_len;
520         }
521
522         return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528         switch (satype) {
529         case SADB_SATYPE_UNSPEC:
530                 return IPSEC_PROTO_ANY;
531         case SADB_SATYPE_AH:
532                 return IPPROTO_AH;
533         case SADB_SATYPE_ESP:
534                 return IPPROTO_ESP;
535         case SADB_X_SATYPE_IPCOMP:
536                 return IPPROTO_COMP;
537                 break;
538         default:
539                 return 0;
540         }
541         /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547         switch (proto) {
548         case IPPROTO_AH:
549                 return SADB_SATYPE_AH;
550         case IPPROTO_ESP:
551                 return SADB_SATYPE_ESP;
552         case IPPROTO_COMP:
553                 return SADB_X_SATYPE_IPCOMP;
554                 break;
555         default:
556                 return 0;
557         }
558         /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562  * say specifically 'just raw sockets' as we encode them as 255.
563  */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572         return (proto ? proto : IPSEC_PROTO_ANY);
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577         switch (family) {
578         case AF_INET:
579                 return sizeof(struct sockaddr_in);
580 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
581         case AF_INET6:
582                 return sizeof(struct sockaddr_in6);
583 #endif
584         }
585         return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591         switch (sa->sa_family) {
592         case AF_INET:
593                 xaddr->a4 =
594                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595                 return AF_INET;
596 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
597         case AF_INET6:
598                 memcpy(xaddr->a6,
599                        &((struct sockaddr_in6 *)sa)->sin6_addr,
600                        sizeof(struct in6_addr));
601                 return AF_INET6;
602 #endif
603         }
604         return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611                                       xaddr);
612 }
613
614 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs)
615 {
616         struct sadb_sa *sa;
617         struct sadb_address *addr;
618         uint16_t proto;
619         unsigned short family;
620         xfrm_address_t *xaddr;
621
622         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
623         if (sa == NULL)
624                 return NULL;
625
626         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627         if (proto == 0)
628                 return NULL;
629
630         /* sadb_address_len should be checked by caller */
631         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
632         if (addr == NULL)
633                 return NULL;
634
635         family = ((struct sockaddr *)(addr + 1))->sa_family;
636         switch (family) {
637         case AF_INET:
638                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
639                 break;
640 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
641         case AF_INET6:
642                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643                 break;
644 #endif
645         default:
646                 xaddr = NULL;
647         }
648
649         if (!xaddr)
650                 return NULL;
651
652         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665         switch(mode) {
666         case XFRM_MODE_TRANSPORT:
667                 return IPSEC_MODE_TRANSPORT;
668         case XFRM_MODE_TUNNEL:
669                 return IPSEC_MODE_TUNNEL;
670         case XFRM_MODE_BEET:
671                 return IPSEC_MODE_BEET;
672         default:
673                 return -1;
674         }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679         switch(mode) {
680         case IPSEC_MODE_ANY:    /*XXX*/
681         case IPSEC_MODE_TRANSPORT:
682                 return XFRM_MODE_TRANSPORT;
683         case IPSEC_MODE_TUNNEL:
684                 return XFRM_MODE_TUNNEL;
685         case IPSEC_MODE_BEET:
686                 return XFRM_MODE_BEET;
687         default:
688                 return -1;
689         }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
693                                        struct sockaddr *sa,
694                                        unsigned short family)
695 {
696         switch (family) {
697         case AF_INET:
698             {
699                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700                 sin->sin_family = AF_INET;
701                 sin->sin_port = port;
702                 sin->sin_addr.s_addr = xaddr->a4;
703                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704                 return 32;
705             }
706 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
707         case AF_INET6:
708             {
709                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710                 sin6->sin6_family = AF_INET6;
711                 sin6->sin6_port = port;
712                 sin6->sin6_flowinfo = 0;
713                 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
714                 sin6->sin6_scope_id = 0;
715                 return 128;
716             }
717 #endif
718         }
719         return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
723                                               int add_keys, int hsc)
724 {
725         struct sk_buff *skb;
726         struct sadb_msg *hdr;
727         struct sadb_sa *sa;
728         struct sadb_lifetime *lifetime;
729         struct sadb_address *addr;
730         struct sadb_key *key;
731         struct sadb_x_sa2 *sa2;
732         struct sadb_x_sec_ctx *sec_ctx;
733         struct xfrm_sec_ctx *xfrm_ctx;
734         int ctx_size = 0;
735         int size;
736         int auth_key_size = 0;
737         int encrypt_key_size = 0;
738         int sockaddr_size;
739         struct xfrm_encap_tmpl *natt = NULL;
740         int mode;
741
742         /* address family check */
743         sockaddr_size = pfkey_sockaddr_size(x->props.family);
744         if (!sockaddr_size)
745                 return ERR_PTR(-EINVAL);
746
747         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748            key(AE), (identity(SD),) (sensitivity)> */
749         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750                 sizeof(struct sadb_lifetime) +
751                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753                         sizeof(struct sadb_address)*2 +
754                                 sockaddr_size*2 +
755                                         sizeof(struct sadb_x_sa2);
756
757         if ((xfrm_ctx = x->security)) {
758                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760         }
761
762         /* identity & sensitivity */
763         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
764                 size += sizeof(struct sadb_address) + sockaddr_size;
765
766         if (add_keys) {
767                 if (x->aalg && x->aalg->alg_key_len) {
768                         auth_key_size =
769                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770                         size += sizeof(struct sadb_key) + auth_key_size;
771                 }
772                 if (x->ealg && x->ealg->alg_key_len) {
773                         encrypt_key_size =
774                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775                         size += sizeof(struct sadb_key) + encrypt_key_size;
776                 }
777         }
778         if (x->encap)
779                 natt = x->encap;
780
781         if (natt && natt->encap_type) {
782                 size += sizeof(struct sadb_x_nat_t_type);
783                 size += sizeof(struct sadb_x_nat_t_port);
784                 size += sizeof(struct sadb_x_nat_t_port);
785         }
786
787         skb =  alloc_skb(size + 16, GFP_ATOMIC);
788         if (skb == NULL)
789                 return ERR_PTR(-ENOBUFS);
790
791         /* call should fill header later */
792         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793         memset(hdr, 0, size);   /* XXX do we need this ? */
794         hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796         /* sa */
797         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
798         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799         sa->sadb_sa_exttype = SADB_EXT_SA;
800         sa->sadb_sa_spi = x->id.spi;
801         sa->sadb_sa_replay = x->props.replay_window;
802         switch (x->km.state) {
803         case XFRM_STATE_VALID:
804                 sa->sadb_sa_state = x->km.dying ?
805                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806                 break;
807         case XFRM_STATE_ACQ:
808                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809                 break;
810         default:
811                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812                 break;
813         }
814         sa->sadb_sa_auth = 0;
815         if (x->aalg) {
816                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
818         }
819         sa->sadb_sa_encrypt = 0;
820         BUG_ON(x->ealg && x->calg);
821         if (x->ealg) {
822                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
823                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
824         }
825         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
826         if (x->calg) {
827                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
828                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
829         }
830
831         sa->sadb_sa_flags = 0;
832         if (x->props.flags & XFRM_STATE_NOECN)
833                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
834         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
835                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
836         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
837                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
838
839         /* hard time */
840         if (hsc & 2) {
841                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
842                                                              sizeof(struct sadb_lifetime));
843                 lifetime->sadb_lifetime_len =
844                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
845                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
846                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
847                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
848                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
849                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
850         }
851         /* soft time */
852         if (hsc & 1) {
853                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
854                                                              sizeof(struct sadb_lifetime));
855                 lifetime->sadb_lifetime_len =
856                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
857                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
858                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
859                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
860                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
861                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
862         }
863         /* current time */
864         lifetime = (struct sadb_lifetime *)  skb_put(skb,
865                                                      sizeof(struct sadb_lifetime));
866         lifetime->sadb_lifetime_len =
867                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
868         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
869         lifetime->sadb_lifetime_allocations = x->curlft.packets;
870         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
871         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
872         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
873         /* src address */
874         addr = (struct sadb_address*) skb_put(skb,
875                                               sizeof(struct sadb_address)+sockaddr_size);
876         addr->sadb_address_len =
877                 (sizeof(struct sadb_address)+sockaddr_size)/
878                         sizeof(uint64_t);
879         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
880         /* "if the ports are non-zero, then the sadb_address_proto field,
881            normally zero, MUST be filled in with the transport
882            protocol's number." - RFC2367 */
883         addr->sadb_address_proto = 0;
884         addr->sadb_address_reserved = 0;
885
886         addr->sadb_address_prefixlen =
887                 pfkey_sockaddr_fill(&x->props.saddr, 0,
888                                     (struct sockaddr *) (addr + 1),
889                                     x->props.family);
890         if (!addr->sadb_address_prefixlen)
891                 BUG();
892
893         /* dst address */
894         addr = (struct sadb_address*) skb_put(skb,
895                                               sizeof(struct sadb_address)+sockaddr_size);
896         addr->sadb_address_len =
897                 (sizeof(struct sadb_address)+sockaddr_size)/
898                         sizeof(uint64_t);
899         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
900         addr->sadb_address_proto = 0;
901         addr->sadb_address_reserved = 0;
902
903         addr->sadb_address_prefixlen =
904                 pfkey_sockaddr_fill(&x->id.daddr, 0,
905                                     (struct sockaddr *) (addr + 1),
906                                     x->props.family);
907         if (!addr->sadb_address_prefixlen)
908                 BUG();
909
910         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
911                           x->props.family)) {
912                 addr = (struct sadb_address*) skb_put(skb,
913                         sizeof(struct sadb_address)+sockaddr_size);
914                 addr->sadb_address_len =
915                         (sizeof(struct sadb_address)+sockaddr_size)/
916                         sizeof(uint64_t);
917                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
918                 addr->sadb_address_proto =
919                         pfkey_proto_from_xfrm(x->sel.proto);
920                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
921                 addr->sadb_address_reserved = 0;
922
923                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
924                                     (struct sockaddr *) (addr + 1),
925                                     x->props.family);
926         }
927
928         /* auth key */
929         if (add_keys && auth_key_size) {
930                 key = (struct sadb_key *) skb_put(skb,
931                                                   sizeof(struct sadb_key)+auth_key_size);
932                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
933                         sizeof(uint64_t);
934                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
935                 key->sadb_key_bits = x->aalg->alg_key_len;
936                 key->sadb_key_reserved = 0;
937                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
938         }
939         /* encrypt key */
940         if (add_keys && encrypt_key_size) {
941                 key = (struct sadb_key *) skb_put(skb,
942                                                   sizeof(struct sadb_key)+encrypt_key_size);
943                 key->sadb_key_len = (sizeof(struct sadb_key) +
944                                      encrypt_key_size) / sizeof(uint64_t);
945                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
946                 key->sadb_key_bits = x->ealg->alg_key_len;
947                 key->sadb_key_reserved = 0;
948                 memcpy(key + 1, x->ealg->alg_key,
949                        (x->ealg->alg_key_len+7)/8);
950         }
951
952         /* sa */
953         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
954         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
955         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
956         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
957                 kfree_skb(skb);
958                 return ERR_PTR(-EINVAL);
959         }
960         sa2->sadb_x_sa2_mode = mode;
961         sa2->sadb_x_sa2_reserved1 = 0;
962         sa2->sadb_x_sa2_reserved2 = 0;
963         sa2->sadb_x_sa2_sequence = 0;
964         sa2->sadb_x_sa2_reqid = x->props.reqid;
965
966         if (natt && natt->encap_type) {
967                 struct sadb_x_nat_t_type *n_type;
968                 struct sadb_x_nat_t_port *n_port;
969
970                 /* type */
971                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
972                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
973                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
974                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
975                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
976                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
977                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
978
979                 /* source port */
980                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
981                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
982                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
983                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
984                 n_port->sadb_x_nat_t_port_reserved = 0;
985
986                 /* dest port */
987                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
988                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
989                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
990                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
991                 n_port->sadb_x_nat_t_port_reserved = 0;
992         }
993
994         /* security context */
995         if (xfrm_ctx) {
996                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
997                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
998                 sec_ctx->sadb_x_sec_len =
999                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1000                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1001                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1002                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1003                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1004                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1005                        xfrm_ctx->ctx_len);
1006         }
1007
1008         return skb;
1009 }
1010
1011
1012 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1013 {
1014         struct sk_buff *skb;
1015
1016         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1017
1018         return skb;
1019 }
1020
1021 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1022                                                           int hsc)
1023 {
1024         return __pfkey_xfrm_state2msg(x, 0, hsc);
1025 }
1026
1027 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1028                                                 struct sadb_msg *hdr,
1029                                                 void **ext_hdrs)
1030 {
1031         struct xfrm_state *x;
1032         struct sadb_lifetime *lifetime;
1033         struct sadb_sa *sa;
1034         struct sadb_key *key;
1035         struct sadb_x_sec_ctx *sec_ctx;
1036         uint16_t proto;
1037         int err;
1038
1039
1040         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1041         if (!sa ||
1042             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1043                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1044                 return ERR_PTR(-EINVAL);
1045         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1046             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1047                 return ERR_PTR(-EINVAL);
1048         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1049             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1050                 return ERR_PTR(-EINVAL);
1051         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1052             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1053                 return ERR_PTR(-EINVAL);
1054
1055         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1056         if (proto == 0)
1057                 return ERR_PTR(-EINVAL);
1058
1059         /* default error is no buffer space */
1060         err = -ENOBUFS;
1061
1062         /* RFC2367:
1063
1064    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1065    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1066    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1067    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1068    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1069    not true.
1070
1071            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1072            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1073          */
1074         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1075             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1076              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1077             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1078                 return ERR_PTR(-EINVAL);
1079         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1080         if (key != NULL &&
1081             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1082             ((key->sadb_key_bits+7) / 8 == 0 ||
1083              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1084                 return ERR_PTR(-EINVAL);
1085         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1086         if (key != NULL &&
1087             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1088             ((key->sadb_key_bits+7) / 8 == 0 ||
1089              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1090                 return ERR_PTR(-EINVAL);
1091
1092         x = xfrm_state_alloc(net);
1093         if (x == NULL)
1094                 return ERR_PTR(-ENOBUFS);
1095
1096         x->id.proto = proto;
1097         x->id.spi = sa->sadb_sa_spi;
1098         x->props.replay_window = sa->sadb_sa_replay;
1099         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1100                 x->props.flags |= XFRM_STATE_NOECN;
1101         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1102                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1103         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1104                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1105
1106         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1107         if (lifetime != NULL) {
1108                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1109                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1110                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1111                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1112         }
1113         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1114         if (lifetime != NULL) {
1115                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1116                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1117                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1118                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1119         }
1120
1121         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1122         if (sec_ctx != NULL) {
1123                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1124
1125                 if (!uctx)
1126                         goto out;
1127
1128                 err = security_xfrm_state_alloc(x, uctx);
1129                 kfree(uctx);
1130
1131                 if (err)
1132                         goto out;
1133         }
1134
1135         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1136         if (sa->sadb_sa_auth) {
1137                 int keysize = 0;
1138                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1139                 if (!a) {
1140                         err = -ENOSYS;
1141                         goto out;
1142                 }
1143                 if (key)
1144                         keysize = (key->sadb_key_bits + 7) / 8;
1145                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1146                 if (!x->aalg)
1147                         goto out;
1148                 strcpy(x->aalg->alg_name, a->name);
1149                 x->aalg->alg_key_len = 0;
1150                 if (key) {
1151                         x->aalg->alg_key_len = key->sadb_key_bits;
1152                         memcpy(x->aalg->alg_key, key+1, keysize);
1153                 }
1154                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1155                 x->props.aalgo = sa->sadb_sa_auth;
1156                 /* x->algo.flags = sa->sadb_sa_flags; */
1157         }
1158         if (sa->sadb_sa_encrypt) {
1159                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1160                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1161                         if (!a) {
1162                                 err = -ENOSYS;
1163                                 goto out;
1164                         }
1165                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1166                         if (!x->calg)
1167                                 goto out;
1168                         strcpy(x->calg->alg_name, a->name);
1169                         x->props.calgo = sa->sadb_sa_encrypt;
1170                 } else {
1171                         int keysize = 0;
1172                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1173                         if (!a) {
1174                                 err = -ENOSYS;
1175                                 goto out;
1176                         }
1177                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1178                         if (key)
1179                                 keysize = (key->sadb_key_bits + 7) / 8;
1180                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1181                         if (!x->ealg)
1182                                 goto out;
1183                         strcpy(x->ealg->alg_name, a->name);
1184                         x->ealg->alg_key_len = 0;
1185                         if (key) {
1186                                 x->ealg->alg_key_len = key->sadb_key_bits;
1187                                 memcpy(x->ealg->alg_key, key+1, keysize);
1188                         }
1189                         x->props.ealgo = sa->sadb_sa_encrypt;
1190                 }
1191         }
1192         /* x->algo.flags = sa->sadb_sa_flags; */
1193
1194         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1195                                                     &x->props.saddr);
1196         if (!x->props.family) {
1197                 err = -EAFNOSUPPORT;
1198                 goto out;
1199         }
1200         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201                                   &x->id.daddr);
1202
1203         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1205                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206                 if (mode < 0) {
1207                         err = -EINVAL;
1208                         goto out;
1209                 }
1210                 x->props.mode = mode;
1211                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212         }
1213
1214         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217                 /* Nobody uses this, but we try. */
1218                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220         }
1221
1222         if (!x->sel.family)
1223                 x->sel.family = x->props.family;
1224
1225         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226                 struct sadb_x_nat_t_type* n_type;
1227                 struct xfrm_encap_tmpl *natt;
1228
1229                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230                 if (!x->encap)
1231                         goto out;
1232
1233                 natt = x->encap;
1234                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238                         struct sadb_x_nat_t_port* n_port =
1239                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241                 }
1242                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243                         struct sadb_x_nat_t_port* n_port =
1244                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246                 }
1247                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248         }
1249
1250         err = xfrm_init_state(x);
1251         if (err)
1252                 goto out;
1253
1254         x->km.seq = hdr->sadb_msg_seq;
1255         return x;
1256
1257 out:
1258         x->km.state = XFRM_STATE_DEAD;
1259         xfrm_state_put(x);
1260         return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1264 {
1265         return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1269 {
1270         struct net *net = sock_net(sk);
1271         struct sk_buff *resp_skb;
1272         struct sadb_x_sa2 *sa2;
1273         struct sadb_address *saddr, *daddr;
1274         struct sadb_msg *out_hdr;
1275         struct sadb_spirange *range;
1276         struct xfrm_state *x = NULL;
1277         int mode;
1278         int err;
1279         u32 min_spi, max_spi;
1280         u32 reqid;
1281         u8 proto;
1282         unsigned short family;
1283         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287                 return -EINVAL;
1288
1289         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290         if (proto == 0)
1291                 return -EINVAL;
1292
1293         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295                 if (mode < 0)
1296                         return -EINVAL;
1297                 reqid = sa2->sadb_x_sa2_reqid;
1298         } else {
1299                 mode = 0;
1300                 reqid = 0;
1301         }
1302
1303         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307         switch (family) {
1308         case AF_INET:
1309                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311                 break;
1312 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1313         case AF_INET6:
1314                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316                 break;
1317 #endif
1318         }
1319
1320         if (hdr->sadb_msg_seq) {
1321                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1323                         xfrm_state_put(x);
1324                         x = NULL;
1325                 }
1326         }
1327
1328         if (!x)
1329                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331         if (x == NULL)
1332                 return -ENOENT;
1333
1334         min_spi = 0x100;
1335         max_spi = 0x0fffffff;
1336
1337         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338         if (range) {
1339                 min_spi = range->sadb_spirange_min;
1340                 max_spi = range->sadb_spirange_max;
1341         }
1342
1343         err = xfrm_alloc_spi(x, min_spi, max_spi);
1344         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1345
1346         if (IS_ERR(resp_skb)) {
1347                 xfrm_state_put(x);
1348                 return  PTR_ERR(resp_skb);
1349         }
1350
1351         out_hdr = (struct sadb_msg *) resp_skb->data;
1352         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1353         out_hdr->sadb_msg_type = SADB_GETSPI;
1354         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1355         out_hdr->sadb_msg_errno = 0;
1356         out_hdr->sadb_msg_reserved = 0;
1357         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1358         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1359
1360         xfrm_state_put(x);
1361
1362         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1363
1364         return 0;
1365 }
1366
1367 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1368 {
1369         struct net *net = sock_net(sk);
1370         struct xfrm_state *x;
1371
1372         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1373                 return -EOPNOTSUPP;
1374
1375         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1376                 return 0;
1377
1378         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379         if (x == NULL)
1380                 return 0;
1381
1382         spin_lock_bh(&x->lock);
1383         if (x->km.state == XFRM_STATE_ACQ) {
1384                 x->km.state = XFRM_STATE_ERROR;
1385                 wake_up(&net->xfrm.km_waitq);
1386         }
1387         spin_unlock_bh(&x->lock);
1388         xfrm_state_put(x);
1389         return 0;
1390 }
1391
1392 static inline int event2poltype(int event)
1393 {
1394         switch (event) {
1395         case XFRM_MSG_DELPOLICY:
1396                 return SADB_X_SPDDELETE;
1397         case XFRM_MSG_NEWPOLICY:
1398                 return SADB_X_SPDADD;
1399         case XFRM_MSG_UPDPOLICY:
1400                 return SADB_X_SPDUPDATE;
1401         case XFRM_MSG_POLEXPIRE:
1402         //      return SADB_X_SPDEXPIRE;
1403         default:
1404                 printk("pfkey: Unknown policy event %d\n", event);
1405                 break;
1406         }
1407
1408         return 0;
1409 }
1410
1411 static inline int event2keytype(int event)
1412 {
1413         switch (event) {
1414         case XFRM_MSG_DELSA:
1415                 return SADB_DELETE;
1416         case XFRM_MSG_NEWSA:
1417                 return SADB_ADD;
1418         case XFRM_MSG_UPDSA:
1419                 return SADB_UPDATE;
1420         case XFRM_MSG_EXPIRE:
1421                 return SADB_EXPIRE;
1422         default:
1423                 printk("pfkey: Unknown SA event %d\n", event);
1424                 break;
1425         }
1426
1427         return 0;
1428 }
1429
1430 /* ADD/UPD/DEL */
1431 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1432 {
1433         struct sk_buff *skb;
1434         struct sadb_msg *hdr;
1435
1436         skb = pfkey_xfrm_state2msg(x);
1437
1438         if (IS_ERR(skb))
1439                 return PTR_ERR(skb);
1440
1441         hdr = (struct sadb_msg *) skb->data;
1442         hdr->sadb_msg_version = PF_KEY_V2;
1443         hdr->sadb_msg_type = event2keytype(c->event);
1444         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1445         hdr->sadb_msg_errno = 0;
1446         hdr->sadb_msg_reserved = 0;
1447         hdr->sadb_msg_seq = c->seq;
1448         hdr->sadb_msg_pid = c->pid;
1449
1450         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1451
1452         return 0;
1453 }
1454
1455 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1456 {
1457         struct net *net = sock_net(sk);
1458         struct xfrm_state *x;
1459         int err;
1460         struct km_event c;
1461
1462         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1463         if (IS_ERR(x))
1464                 return PTR_ERR(x);
1465
1466         xfrm_state_hold(x);
1467         if (hdr->sadb_msg_type == SADB_ADD)
1468                 err = xfrm_state_add(x);
1469         else
1470                 err = xfrm_state_update(x);
1471
1472         xfrm_audit_state_add(x, err ? 0 : 1,
1473                              audit_get_loginuid(current),
1474                              audit_get_sessionid(current), 0);
1475
1476         if (err < 0) {
1477                 x->km.state = XFRM_STATE_DEAD;
1478                 __xfrm_state_put(x);
1479                 goto out;
1480         }
1481
1482         if (hdr->sadb_msg_type == SADB_ADD)
1483                 c.event = XFRM_MSG_NEWSA;
1484         else
1485                 c.event = XFRM_MSG_UPDSA;
1486         c.seq = hdr->sadb_msg_seq;
1487         c.pid = hdr->sadb_msg_pid;
1488         km_state_notify(x, &c);
1489 out:
1490         xfrm_state_put(x);
1491         return err;
1492 }
1493
1494 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1495 {
1496         struct net *net = sock_net(sk);
1497         struct xfrm_state *x;
1498         struct km_event c;
1499         int err;
1500
1501         if (!ext_hdrs[SADB_EXT_SA-1] ||
1502             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1503                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1504                 return -EINVAL;
1505
1506         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1507         if (x == NULL)
1508                 return -ESRCH;
1509
1510         if ((err = security_xfrm_state_delete(x)))
1511                 goto out;
1512
1513         if (xfrm_state_kern(x)) {
1514                 err = -EPERM;
1515                 goto out;
1516         }
1517
1518         err = xfrm_state_delete(x);
1519
1520         if (err < 0)
1521                 goto out;
1522
1523         c.seq = hdr->sadb_msg_seq;
1524         c.pid = hdr->sadb_msg_pid;
1525         c.event = XFRM_MSG_DELSA;
1526         km_state_notify(x, &c);
1527 out:
1528         xfrm_audit_state_delete(x, err ? 0 : 1,
1529                                 audit_get_loginuid(current),
1530                                 audit_get_sessionid(current), 0);
1531         xfrm_state_put(x);
1532
1533         return err;
1534 }
1535
1536 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1537 {
1538         struct net *net = sock_net(sk);
1539         __u8 proto;
1540         struct sk_buff *out_skb;
1541         struct sadb_msg *out_hdr;
1542         struct xfrm_state *x;
1543
1544         if (!ext_hdrs[SADB_EXT_SA-1] ||
1545             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1546                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1547                 return -EINVAL;
1548
1549         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1550         if (x == NULL)
1551                 return -ESRCH;
1552
1553         out_skb = pfkey_xfrm_state2msg(x);
1554         proto = x->id.proto;
1555         xfrm_state_put(x);
1556         if (IS_ERR(out_skb))
1557                 return  PTR_ERR(out_skb);
1558
1559         out_hdr = (struct sadb_msg *) out_skb->data;
1560         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561         out_hdr->sadb_msg_type = SADB_GET;
1562         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1563         out_hdr->sadb_msg_errno = 0;
1564         out_hdr->sadb_msg_reserved = 0;
1565         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1566         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1567         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1568
1569         return 0;
1570 }
1571
1572 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1573                                               gfp_t allocation)
1574 {
1575         struct sk_buff *skb;
1576         struct sadb_msg *hdr;
1577         int len, auth_len, enc_len, i;
1578
1579         auth_len = xfrm_count_auth_supported();
1580         if (auth_len) {
1581                 auth_len *= sizeof(struct sadb_alg);
1582                 auth_len += sizeof(struct sadb_supported);
1583         }
1584
1585         enc_len = xfrm_count_enc_supported();
1586         if (enc_len) {
1587                 enc_len *= sizeof(struct sadb_alg);
1588                 enc_len += sizeof(struct sadb_supported);
1589         }
1590
1591         len = enc_len + auth_len + sizeof(struct sadb_msg);
1592
1593         skb = alloc_skb(len + 16, allocation);
1594         if (!skb)
1595                 goto out_put_algs;
1596
1597         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1598         pfkey_hdr_dup(hdr, orig);
1599         hdr->sadb_msg_errno = 0;
1600         hdr->sadb_msg_len = len / sizeof(uint64_t);
1601
1602         if (auth_len) {
1603                 struct sadb_supported *sp;
1604                 struct sadb_alg *ap;
1605
1606                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1607                 ap = (struct sadb_alg *) (sp + 1);
1608
1609                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1610                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1611
1612                 for (i = 0; ; i++) {
1613                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1614                         if (!aalg)
1615                                 break;
1616                         if (aalg->available)
1617                                 *ap++ = aalg->desc;
1618                 }
1619         }
1620
1621         if (enc_len) {
1622                 struct sadb_supported *sp;
1623                 struct sadb_alg *ap;
1624
1625                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1626                 ap = (struct sadb_alg *) (sp + 1);
1627
1628                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1629                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1630
1631                 for (i = 0; ; i++) {
1632                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1633                         if (!ealg)
1634                                 break;
1635                         if (ealg->available)
1636                                 *ap++ = ealg->desc;
1637                 }
1638         }
1639
1640 out_put_algs:
1641         return skb;
1642 }
1643
1644 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1645 {
1646         struct pfkey_sock *pfk = pfkey_sk(sk);
1647         struct sk_buff *supp_skb;
1648
1649         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1650                 return -EINVAL;
1651
1652         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1653                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1654                         return -EEXIST;
1655                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1656         }
1657
1658         xfrm_probe_algs();
1659
1660         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1661         if (!supp_skb) {
1662                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1663                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1664
1665                 return -ENOBUFS;
1666         }
1667
1668         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1669
1670         return 0;
1671 }
1672
1673 static int unicast_flush_resp(struct sock *sk, struct sadb_msg *ihdr)
1674 {
1675         struct sk_buff *skb;
1676         struct sadb_msg *hdr;
1677
1678         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1679         if (!skb)
1680                 return -ENOBUFS;
1681
1682         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1683         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1684         hdr->sadb_msg_errno = (uint8_t) 0;
1685         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1686
1687         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1688 }
1689
1690 static int key_notify_sa_flush(struct km_event *c)
1691 {
1692         struct sk_buff *skb;
1693         struct sadb_msg *hdr;
1694
1695         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1696         if (!skb)
1697                 return -ENOBUFS;
1698         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1699         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1700         hdr->sadb_msg_type = SADB_FLUSH;
1701         hdr->sadb_msg_seq = c->seq;
1702         hdr->sadb_msg_pid = c->pid;
1703         hdr->sadb_msg_version = PF_KEY_V2;
1704         hdr->sadb_msg_errno = (uint8_t) 0;
1705         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1706
1707         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1708
1709         return 0;
1710 }
1711
1712 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1713 {
1714         struct net *net = sock_net(sk);
1715         unsigned proto;
1716         struct km_event c;
1717         struct xfrm_audit audit_info;
1718         int err, err2;
1719
1720         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1721         if (proto == 0)
1722                 return -EINVAL;
1723
1724         audit_info.loginuid = audit_get_loginuid(current);
1725         audit_info.sessionid = audit_get_sessionid(current);
1726         audit_info.secid = 0;
1727         err = xfrm_state_flush(net, proto, &audit_info);
1728         err2 = unicast_flush_resp(sk, hdr);
1729         if (err || err2) {
1730                 if (err == -ESRCH) /* empty table - go quietly */
1731                         err = 0;
1732                 return err ? err : err2;
1733         }
1734
1735         c.data.proto = proto;
1736         c.seq = hdr->sadb_msg_seq;
1737         c.pid = hdr->sadb_msg_pid;
1738         c.event = XFRM_MSG_FLUSHSA;
1739         c.net = net;
1740         km_state_notify(NULL, &c);
1741
1742         return 0;
1743 }
1744
1745 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1746 {
1747         struct pfkey_sock *pfk = ptr;
1748         struct sk_buff *out_skb;
1749         struct sadb_msg *out_hdr;
1750
1751         if (!pfkey_can_dump(&pfk->sk))
1752                 return -ENOBUFS;
1753
1754         out_skb = pfkey_xfrm_state2msg(x);
1755         if (IS_ERR(out_skb))
1756                 return PTR_ERR(out_skb);
1757
1758         out_hdr = (struct sadb_msg *) out_skb->data;
1759         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1760         out_hdr->sadb_msg_type = SADB_DUMP;
1761         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1762         out_hdr->sadb_msg_errno = 0;
1763         out_hdr->sadb_msg_reserved = 0;
1764         out_hdr->sadb_msg_seq = count + 1;
1765         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1766
1767         if (pfk->dump.skb)
1768                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1769                                 &pfk->sk, sock_net(&pfk->sk));
1770         pfk->dump.skb = out_skb;
1771
1772         return 0;
1773 }
1774
1775 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1776 {
1777         struct net *net = sock_net(&pfk->sk);
1778         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1779 }
1780
1781 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1782 {
1783         xfrm_state_walk_done(&pfk->dump.u.state);
1784 }
1785
1786 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1787 {
1788         u8 proto;
1789         struct pfkey_sock *pfk = pfkey_sk(sk);
1790
1791         if (pfk->dump.dump != NULL)
1792                 return -EBUSY;
1793
1794         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1795         if (proto == 0)
1796                 return -EINVAL;
1797
1798         pfk->dump.msg_version = hdr->sadb_msg_version;
1799         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1800         pfk->dump.dump = pfkey_dump_sa;
1801         pfk->dump.done = pfkey_dump_sa_done;
1802         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1803
1804         return pfkey_do_dump(pfk);
1805 }
1806
1807 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1808 {
1809         struct pfkey_sock *pfk = pfkey_sk(sk);
1810         int satype = hdr->sadb_msg_satype;
1811
1812         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1813                 /* XXX we mangle packet... */
1814                 hdr->sadb_msg_errno = 0;
1815                 if (satype != 0 && satype != 1)
1816                         return -EINVAL;
1817                 pfk->promisc = satype;
1818         }
1819         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1820         return 0;
1821 }
1822
1823 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1824 {
1825         int i;
1826         u32 reqid = *(u32*)ptr;
1827
1828         for (i=0; i<xp->xfrm_nr; i++) {
1829                 if (xp->xfrm_vec[i].reqid == reqid)
1830                         return -EEXIST;
1831         }
1832         return 0;
1833 }
1834
1835 static u32 gen_reqid(struct net *net)
1836 {
1837         struct xfrm_policy_walk walk;
1838         u32 start;
1839         int rc;
1840         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1841
1842         start = reqid;
1843         do {
1844                 ++reqid;
1845                 if (reqid == 0)
1846                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1847                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1848                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1849                 xfrm_policy_walk_done(&walk);
1850                 if (rc != -EEXIST)
1851                         return reqid;
1852         } while (reqid != start);
1853         return 0;
1854 }
1855
1856 static int
1857 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1858 {
1859         struct net *net = xp_net(xp);
1860         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1861         int mode;
1862
1863         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1864                 return -ELOOP;
1865
1866         if (rq->sadb_x_ipsecrequest_mode == 0)
1867                 return -EINVAL;
1868
1869         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1870         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1871                 return -EINVAL;
1872         t->mode = mode;
1873         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1874                 t->optional = 1;
1875         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1876                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1877                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1878                         t->reqid = 0;
1879                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1880                         return -ENOBUFS;
1881         }
1882
1883         /* addresses present only in tunnel mode */
1884         if (t->mode == XFRM_MODE_TUNNEL) {
1885                 u8 *sa = (u8 *) (rq + 1);
1886                 int family, socklen;
1887
1888                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1889                                                 &t->saddr);
1890                 if (!family)
1891                         return -EINVAL;
1892
1893                 socklen = pfkey_sockaddr_len(family);
1894                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1895                                            &t->id.daddr) != family)
1896                         return -EINVAL;
1897                 t->encap_family = family;
1898         } else
1899                 t->encap_family = xp->family;
1900
1901         /* No way to set this via kame pfkey */
1902         t->allalgs = 1;
1903         xp->xfrm_nr++;
1904         return 0;
1905 }
1906
1907 static int
1908 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1909 {
1910         int err;
1911         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1912         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1913
1914         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1915                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1916                         return err;
1917                 len -= rq->sadb_x_ipsecrequest_len;
1918                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1919         }
1920         return 0;
1921 }
1922
1923 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1924 {
1925   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1926
1927         if (xfrm_ctx) {
1928                 int len = sizeof(struct sadb_x_sec_ctx);
1929                 len += xfrm_ctx->ctx_len;
1930                 return PFKEY_ALIGN8(len);
1931         }
1932         return 0;
1933 }
1934
1935 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1936 {
1937         struct xfrm_tmpl *t;
1938         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1939         int socklen = 0;
1940         int i;
1941
1942         for (i=0; i<xp->xfrm_nr; i++) {
1943                 t = xp->xfrm_vec + i;
1944                 socklen += pfkey_sockaddr_len(t->encap_family);
1945         }
1946
1947         return sizeof(struct sadb_msg) +
1948                 (sizeof(struct sadb_lifetime) * 3) +
1949                 (sizeof(struct sadb_address) * 2) +
1950                 (sockaddr_size * 2) +
1951                 sizeof(struct sadb_x_policy) +
1952                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1953                 (socklen * 2) +
1954                 pfkey_xfrm_policy2sec_ctx_size(xp);
1955 }
1956
1957 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1958 {
1959         struct sk_buff *skb;
1960         int size;
1961
1962         size = pfkey_xfrm_policy2msg_size(xp);
1963
1964         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1965         if (skb == NULL)
1966                 return ERR_PTR(-ENOBUFS);
1967
1968         return skb;
1969 }
1970
1971 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1972 {
1973         struct sadb_msg *hdr;
1974         struct sadb_address *addr;
1975         struct sadb_lifetime *lifetime;
1976         struct sadb_x_policy *pol;
1977         struct sadb_x_sec_ctx *sec_ctx;
1978         struct xfrm_sec_ctx *xfrm_ctx;
1979         int i;
1980         int size;
1981         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1982         int socklen = pfkey_sockaddr_len(xp->family);
1983
1984         size = pfkey_xfrm_policy2msg_size(xp);
1985
1986         /* call should fill header later */
1987         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1988         memset(hdr, 0, size);   /* XXX do we need this ? */
1989
1990         /* src address */
1991         addr = (struct sadb_address*) skb_put(skb,
1992                                               sizeof(struct sadb_address)+sockaddr_size);
1993         addr->sadb_address_len =
1994                 (sizeof(struct sadb_address)+sockaddr_size)/
1995                         sizeof(uint64_t);
1996         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1997         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1998         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1999         addr->sadb_address_reserved = 0;
2000         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2001                                  xp->selector.sport,
2002                                  (struct sockaddr *) (addr + 1),
2003                                  xp->family))
2004                 BUG();
2005
2006         /* dst address */
2007         addr = (struct sadb_address*) skb_put(skb,
2008                                               sizeof(struct sadb_address)+sockaddr_size);
2009         addr->sadb_address_len =
2010                 (sizeof(struct sadb_address)+sockaddr_size)/
2011                         sizeof(uint64_t);
2012         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2013         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2014         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2015         addr->sadb_address_reserved = 0;
2016
2017         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2018                             (struct sockaddr *) (addr + 1),
2019                             xp->family);
2020
2021         /* hard time */
2022         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2023                                                      sizeof(struct sadb_lifetime));
2024         lifetime->sadb_lifetime_len =
2025                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2026         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2027         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2028         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2029         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2030         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2031         /* soft time */
2032         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2033                                                      sizeof(struct sadb_lifetime));
2034         lifetime->sadb_lifetime_len =
2035                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2036         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2037         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2038         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2039         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2040         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2041         /* current time */
2042         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2043                                                      sizeof(struct sadb_lifetime));
2044         lifetime->sadb_lifetime_len =
2045                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2046         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2047         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2048         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2049         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2050         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2051
2052         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2053         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2054         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2055         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2056         if (xp->action == XFRM_POLICY_ALLOW) {
2057                 if (xp->xfrm_nr)
2058                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2059                 else
2060                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2061         }
2062         pol->sadb_x_policy_dir = dir+1;
2063         pol->sadb_x_policy_id = xp->index;
2064         pol->sadb_x_policy_priority = xp->priority;
2065
2066         for (i=0; i<xp->xfrm_nr; i++) {
2067                 struct sadb_x_ipsecrequest *rq;
2068                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2069                 int req_size;
2070                 int mode;
2071
2072                 req_size = sizeof(struct sadb_x_ipsecrequest);
2073                 if (t->mode == XFRM_MODE_TUNNEL) {
2074                         socklen = pfkey_sockaddr_len(t->encap_family);
2075                         req_size += socklen * 2;
2076                 } else {
2077                         size -= 2*socklen;
2078                 }
2079                 rq = (void*)skb_put(skb, req_size);
2080                 pol->sadb_x_policy_len += req_size/8;
2081                 memset(rq, 0, sizeof(*rq));
2082                 rq->sadb_x_ipsecrequest_len = req_size;
2083                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2084                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2085                         return -EINVAL;
2086                 rq->sadb_x_ipsecrequest_mode = mode;
2087                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2088                 if (t->reqid)
2089                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2090                 if (t->optional)
2091                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2092                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2093
2094                 if (t->mode == XFRM_MODE_TUNNEL) {
2095                         u8 *sa = (void *)(rq + 1);
2096                         pfkey_sockaddr_fill(&t->saddr, 0,
2097                                             (struct sockaddr *)sa,
2098                                             t->encap_family);
2099                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2100                                             (struct sockaddr *) (sa + socklen),
2101                                             t->encap_family);
2102                 }
2103         }
2104
2105         /* security context */
2106         if ((xfrm_ctx = xp->security)) {
2107                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2108
2109                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2110                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2111                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2112                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2113                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2114                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2115                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2116                        xfrm_ctx->ctx_len);
2117         }
2118
2119         hdr->sadb_msg_len = size / sizeof(uint64_t);
2120         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2121
2122         return 0;
2123 }
2124
2125 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2126 {
2127         struct sk_buff *out_skb;
2128         struct sadb_msg *out_hdr;
2129         int err;
2130
2131         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2132         if (IS_ERR(out_skb)) {
2133                 err = PTR_ERR(out_skb);
2134                 goto out;
2135         }
2136         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2137         if (err < 0)
2138                 return err;
2139
2140         out_hdr = (struct sadb_msg *) out_skb->data;
2141         out_hdr->sadb_msg_version = PF_KEY_V2;
2142
2143         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2144                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2145         else
2146                 out_hdr->sadb_msg_type = event2poltype(c->event);
2147         out_hdr->sadb_msg_errno = 0;
2148         out_hdr->sadb_msg_seq = c->seq;
2149         out_hdr->sadb_msg_pid = c->pid;
2150         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2151 out:
2152         return 0;
2153
2154 }
2155
2156 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2157 {
2158         struct net *net = sock_net(sk);
2159         int err = 0;
2160         struct sadb_lifetime *lifetime;
2161         struct sadb_address *sa;
2162         struct sadb_x_policy *pol;
2163         struct xfrm_policy *xp;
2164         struct km_event c;
2165         struct sadb_x_sec_ctx *sec_ctx;
2166
2167         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2168                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2169             !ext_hdrs[SADB_X_EXT_POLICY-1])
2170                 return -EINVAL;
2171
2172         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2173         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2174                 return -EINVAL;
2175         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2176                 return -EINVAL;
2177
2178         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2179         if (xp == NULL)
2180                 return -ENOBUFS;
2181
2182         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2183                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2184         xp->priority = pol->sadb_x_policy_priority;
2185
2186         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2188         if (!xp->family) {
2189                 err = -EINVAL;
2190                 goto out;
2191         }
2192         xp->selector.family = xp->family;
2193         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2194         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2195         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2196         if (xp->selector.sport)
2197                 xp->selector.sport_mask = htons(0xffff);
2198
2199         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2200         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2201         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2202
2203         /* Amusing, we set this twice.  KAME apps appear to set same value
2204          * in both addresses.
2205          */
2206         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2207
2208         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2209         if (xp->selector.dport)
2210                 xp->selector.dport_mask = htons(0xffff);
2211
2212         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2213         if (sec_ctx != NULL) {
2214                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2215
2216                 if (!uctx) {
2217                         err = -ENOBUFS;
2218                         goto out;
2219                 }
2220
2221                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2222                 kfree(uctx);
2223
2224                 if (err)
2225                         goto out;
2226         }
2227
2228         xp->lft.soft_byte_limit = XFRM_INF;
2229         xp->lft.hard_byte_limit = XFRM_INF;
2230         xp->lft.soft_packet_limit = XFRM_INF;
2231         xp->lft.hard_packet_limit = XFRM_INF;
2232         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2233                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2234                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2235                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2236                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2237         }
2238         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2239                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2240                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2241                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2242                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2243         }
2244         xp->xfrm_nr = 0;
2245         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2246             (err = parse_ipsecrequests(xp, pol)) < 0)
2247                 goto out;
2248
2249         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2250                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2251
2252         xfrm_audit_policy_add(xp, err ? 0 : 1,
2253                               audit_get_loginuid(current),
2254                               audit_get_sessionid(current), 0);
2255
2256         if (err)
2257                 goto out;
2258
2259         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2260                 c.event = XFRM_MSG_UPDPOLICY;
2261         else
2262                 c.event = XFRM_MSG_NEWPOLICY;
2263
2264         c.seq = hdr->sadb_msg_seq;
2265         c.pid = hdr->sadb_msg_pid;
2266
2267         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2268         xfrm_pol_put(xp);
2269         return 0;
2270
2271 out:
2272         xp->walk.dead = 1;
2273         xfrm_policy_destroy(xp);
2274         return err;
2275 }
2276
2277 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2278 {
2279         struct net *net = sock_net(sk);
2280         int err;
2281         struct sadb_address *sa;
2282         struct sadb_x_policy *pol;
2283         struct xfrm_policy *xp;
2284         struct xfrm_selector sel;
2285         struct km_event c;
2286         struct sadb_x_sec_ctx *sec_ctx;
2287         struct xfrm_sec_ctx *pol_ctx = NULL;
2288
2289         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2290                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2291             !ext_hdrs[SADB_X_EXT_POLICY-1])
2292                 return -EINVAL;
2293
2294         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2295         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2296                 return -EINVAL;
2297
2298         memset(&sel, 0, sizeof(sel));
2299
2300         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2301         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2302         sel.prefixlen_s = sa->sadb_address_prefixlen;
2303         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2304         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2305         if (sel.sport)
2306                 sel.sport_mask = htons(0xffff);
2307
2308         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2309         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2310         sel.prefixlen_d = sa->sadb_address_prefixlen;
2311         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2312         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2313         if (sel.dport)
2314                 sel.dport_mask = htons(0xffff);
2315
2316         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2317         if (sec_ctx != NULL) {
2318                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2319
2320                 if (!uctx)
2321                         return -ENOMEM;
2322
2323                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2324                 kfree(uctx);
2325                 if (err)
2326                         return err;
2327         }
2328
2329         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2330                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2331                                    1, &err);
2332         security_xfrm_policy_free(pol_ctx);
2333         if (xp == NULL)
2334                 return -ENOENT;
2335
2336         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2337                                  audit_get_loginuid(current),
2338                                  audit_get_sessionid(current), 0);
2339
2340         if (err)
2341                 goto out;
2342
2343         c.seq = hdr->sadb_msg_seq;
2344         c.pid = hdr->sadb_msg_pid;
2345         c.data.byid = 0;
2346         c.event = XFRM_MSG_DELPOLICY;
2347         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2348
2349 out:
2350         xfrm_pol_put(xp);
2351         return err;
2352 }
2353
2354 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2355 {
2356         int err;
2357         struct sk_buff *out_skb;
2358         struct sadb_msg *out_hdr;
2359         err = 0;
2360
2361         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2362         if (IS_ERR(out_skb)) {
2363                 err =  PTR_ERR(out_skb);
2364                 goto out;
2365         }
2366         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2367         if (err < 0)
2368                 goto out;
2369
2370         out_hdr = (struct sadb_msg *) out_skb->data;
2371         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2372         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2373         out_hdr->sadb_msg_satype = 0;
2374         out_hdr->sadb_msg_errno = 0;
2375         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2376         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2377         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2378         err = 0;
2379
2380 out:
2381         return err;
2382 }
2383
2384 #ifdef CONFIG_NET_KEY_MIGRATE
2385 static int pfkey_sockaddr_pair_size(sa_family_t family)
2386 {
2387         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2388 }
2389
2390 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2391                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2392                                u16 *family)
2393 {
2394         int af, socklen;
2395
2396         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2397                 return -EINVAL;
2398
2399         af = pfkey_sockaddr_extract(sa, saddr);
2400         if (!af)
2401                 return -EINVAL;
2402
2403         socklen = pfkey_sockaddr_len(af);
2404         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2405                                    daddr) != af)
2406                 return -EINVAL;
2407
2408         *family = af;
2409         return 0;
2410 }
2411
2412 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2413                                     struct xfrm_migrate *m)
2414 {
2415         int err;
2416         struct sadb_x_ipsecrequest *rq2;
2417         int mode;
2418
2419         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2420             len < rq1->sadb_x_ipsecrequest_len)
2421                 return -EINVAL;
2422
2423         /* old endoints */
2424         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2425                                   rq1->sadb_x_ipsecrequest_len,
2426                                   &m->old_saddr, &m->old_daddr,
2427                                   &m->old_family);
2428         if (err)
2429                 return err;
2430
2431         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2432         len -= rq1->sadb_x_ipsecrequest_len;
2433
2434         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2435             len < rq2->sadb_x_ipsecrequest_len)
2436                 return -EINVAL;
2437
2438         /* new endpoints */
2439         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2440                                   rq2->sadb_x_ipsecrequest_len,
2441                                   &m->new_saddr, &m->new_daddr,
2442                                   &m->new_family);
2443         if (err)
2444                 return err;
2445
2446         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2447             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2448             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2449                 return -EINVAL;
2450
2451         m->proto = rq1->sadb_x_ipsecrequest_proto;
2452         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2453                 return -EINVAL;
2454         m->mode = mode;
2455         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2456
2457         return ((int)(rq1->sadb_x_ipsecrequest_len +
2458                       rq2->sadb_x_ipsecrequest_len));
2459 }
2460
2461 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2462                          struct sadb_msg *hdr, void **ext_hdrs)
2463 {
2464         int i, len, ret, err = -EINVAL;
2465         u8 dir;
2466         struct sadb_address *sa;
2467         struct sadb_x_kmaddress *kma;
2468         struct sadb_x_policy *pol;
2469         struct sadb_x_ipsecrequest *rq;
2470         struct xfrm_selector sel;
2471         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2472         struct xfrm_kmaddress k;
2473
2474         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2475                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2476             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2477                 err = -EINVAL;
2478                 goto out;
2479         }
2480
2481         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2482         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2483
2484         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2485                 err = -EINVAL;
2486                 goto out;
2487         }
2488
2489         if (kma) {
2490                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2491                 k.reserved = kma->sadb_x_kmaddress_reserved;
2492                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2493                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2494                                           &k.local, &k.remote, &k.family);
2495                 if (ret < 0) {
2496                         err = ret;
2497                         goto out;
2498                 }
2499         }
2500
2501         dir = pol->sadb_x_policy_dir - 1;
2502         memset(&sel, 0, sizeof(sel));
2503
2504         /* set source address info of selector */
2505         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2506         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2507         sel.prefixlen_s = sa->sadb_address_prefixlen;
2508         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2509         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2510         if (sel.sport)
2511                 sel.sport_mask = htons(0xffff);
2512
2513         /* set destination address info of selector */
2514         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2515         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2516         sel.prefixlen_d = sa->sadb_address_prefixlen;
2517         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2518         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2519         if (sel.dport)
2520                 sel.dport_mask = htons(0xffff);
2521
2522         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2523
2524         /* extract ipsecrequests */
2525         i = 0;
2526         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2527
2528         while (len > 0 && i < XFRM_MAX_DEPTH) {
2529                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2530                 if (ret < 0) {
2531                         err = ret;
2532                         goto out;
2533                 } else {
2534                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2535                         len -= ret;
2536                         i++;
2537                 }
2538         }
2539
2540         if (!i || len > 0) {
2541                 err = -EINVAL;
2542                 goto out;
2543         }
2544
2545         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2546                             kma ? &k : NULL);
2547
2548  out:
2549         return err;
2550 }
2551 #else
2552 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2553                          struct sadb_msg *hdr, void **ext_hdrs)
2554 {
2555         return -ENOPROTOOPT;
2556 }
2557 #endif
2558
2559
2560 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2561 {
2562         struct net *net = sock_net(sk);
2563         unsigned int dir;
2564         int err = 0, delete;
2565         struct sadb_x_policy *pol;
2566         struct xfrm_policy *xp;
2567         struct km_event c;
2568
2569         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2570                 return -EINVAL;
2571
2572         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2573         if (dir >= XFRM_POLICY_MAX)
2574                 return -EINVAL;
2575
2576         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2577         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2578                               dir, pol->sadb_x_policy_id, delete, &err);
2579         if (xp == NULL)
2580                 return -ENOENT;
2581
2582         if (delete) {
2583                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2584                                 audit_get_loginuid(current),
2585                                 audit_get_sessionid(current), 0);
2586
2587                 if (err)
2588                         goto out;
2589                 c.seq = hdr->sadb_msg_seq;
2590                 c.pid = hdr->sadb_msg_pid;
2591                 c.data.byid = 1;
2592                 c.event = XFRM_MSG_DELPOLICY;
2593                 km_policy_notify(xp, dir, &c);
2594         } else {
2595                 err = key_pol_get_resp(sk, xp, hdr, dir);
2596         }
2597
2598 out:
2599         xfrm_pol_put(xp);
2600         return err;
2601 }
2602
2603 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2604 {
2605         struct pfkey_sock *pfk = ptr;
2606         struct sk_buff *out_skb;
2607         struct sadb_msg *out_hdr;
2608         int err;
2609
2610         if (!pfkey_can_dump(&pfk->sk))
2611                 return -ENOBUFS;
2612
2613         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2614         if (IS_ERR(out_skb))
2615                 return PTR_ERR(out_skb);
2616
2617         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2618         if (err < 0)
2619                 return err;
2620
2621         out_hdr = (struct sadb_msg *) out_skb->data;
2622         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2623         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2624         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2625         out_hdr->sadb_msg_errno = 0;
2626         out_hdr->sadb_msg_seq = count + 1;
2627         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2628
2629         if (pfk->dump.skb)
2630                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2631                                 &pfk->sk, sock_net(&pfk->sk));
2632         pfk->dump.skb = out_skb;
2633
2634         return 0;
2635 }
2636
2637 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2638 {
2639         struct net *net = sock_net(&pfk->sk);
2640         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2641 }
2642
2643 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2644 {
2645         xfrm_policy_walk_done(&pfk->dump.u.policy);
2646 }
2647
2648 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2649 {
2650         struct pfkey_sock *pfk = pfkey_sk(sk);
2651
2652         if (pfk->dump.dump != NULL)
2653                 return -EBUSY;
2654
2655         pfk->dump.msg_version = hdr->sadb_msg_version;
2656         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2657         pfk->dump.dump = pfkey_dump_sp;
2658         pfk->dump.done = pfkey_dump_sp_done;
2659         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2660
2661         return pfkey_do_dump(pfk);
2662 }
2663
2664 static int key_notify_policy_flush(struct km_event *c)
2665 {
2666         struct sk_buff *skb_out;
2667         struct sadb_msg *hdr;
2668
2669         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2670         if (!skb_out)
2671                 return -ENOBUFS;
2672         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2673         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2674         hdr->sadb_msg_seq = c->seq;
2675         hdr->sadb_msg_pid = c->pid;
2676         hdr->sadb_msg_version = PF_KEY_V2;
2677         hdr->sadb_msg_errno = (uint8_t) 0;
2678         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2679         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2680         return 0;
2681
2682 }
2683
2684 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2685 {
2686         struct net *net = sock_net(sk);
2687         struct km_event c;
2688         struct xfrm_audit audit_info;
2689         int err, err2;
2690
2691         audit_info.loginuid = audit_get_loginuid(current);
2692         audit_info.sessionid = audit_get_sessionid(current);
2693         audit_info.secid = 0;
2694         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2695         err2 = unicast_flush_resp(sk, hdr);
2696         if (err || err2) {
2697                 if (err == -ESRCH) /* empty table - old silent behavior */
2698                         return 0;
2699                 return err;
2700         }
2701
2702         c.data.type = XFRM_POLICY_TYPE_MAIN;
2703         c.event = XFRM_MSG_FLUSHPOLICY;
2704         c.pid = hdr->sadb_msg_pid;
2705         c.seq = hdr->sadb_msg_seq;
2706         c.net = net;
2707         km_policy_notify(NULL, 0, &c);
2708
2709         return 0;
2710 }
2711
2712 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2713                              struct sadb_msg *hdr, void **ext_hdrs);
2714 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2715         [SADB_RESERVED]         = pfkey_reserved,
2716         [SADB_GETSPI]           = pfkey_getspi,
2717         [SADB_UPDATE]           = pfkey_add,
2718         [SADB_ADD]              = pfkey_add,
2719         [SADB_DELETE]           = pfkey_delete,
2720         [SADB_GET]              = pfkey_get,
2721         [SADB_ACQUIRE]          = pfkey_acquire,
2722         [SADB_REGISTER]         = pfkey_register,
2723         [SADB_EXPIRE]           = NULL,
2724         [SADB_FLUSH]            = pfkey_flush,
2725         [SADB_DUMP]             = pfkey_dump,
2726         [SADB_X_PROMISC]        = pfkey_promisc,
2727         [SADB_X_PCHANGE]        = NULL,
2728         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2729         [SADB_X_SPDADD]         = pfkey_spdadd,
2730         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2731         [SADB_X_SPDGET]         = pfkey_spdget,
2732         [SADB_X_SPDACQUIRE]     = NULL,
2733         [SADB_X_SPDDUMP]        = pfkey_spddump,
2734         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2735         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2736         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2737         [SADB_X_MIGRATE]        = pfkey_migrate,
2738 };
2739
2740 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2741 {
2742         void *ext_hdrs[SADB_EXT_MAX];
2743         int err;
2744
2745         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2746                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2747
2748         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2749         err = parse_exthdrs(skb, hdr, ext_hdrs);
2750         if (!err) {
2751                 err = -EOPNOTSUPP;
2752                 if (pfkey_funcs[hdr->sadb_msg_type])
2753                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2754         }
2755         return err;
2756 }
2757
2758 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2759 {
2760         struct sadb_msg *hdr = NULL;
2761
2762         if (skb->len < sizeof(*hdr)) {
2763                 *errp = -EMSGSIZE;
2764         } else {
2765                 hdr = (struct sadb_msg *) skb->data;
2766                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2767                     hdr->sadb_msg_reserved != 0 ||
2768                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2769                      hdr->sadb_msg_type > SADB_MAX)) {
2770                         hdr = NULL;
2771                         *errp = -EINVAL;
2772                 } else if (hdr->sadb_msg_len != (skb->len /
2773                                                  sizeof(uint64_t)) ||
2774                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2775                                                 sizeof(uint64_t))) {
2776                         hdr = NULL;
2777                         *errp = -EMSGSIZE;
2778                 } else {
2779                         *errp = 0;
2780                 }
2781         }
2782         return hdr;
2783 }
2784
2785 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2786 {
2787         unsigned int id = d->desc.sadb_alg_id;
2788
2789         if (id >= sizeof(t->aalgos) * 8)
2790                 return 0;
2791
2792         return (t->aalgos >> id) & 1;
2793 }
2794
2795 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2796 {
2797         unsigned int id = d->desc.sadb_alg_id;
2798
2799         if (id >= sizeof(t->ealgos) * 8)
2800                 return 0;
2801
2802         return (t->ealgos >> id) & 1;
2803 }
2804
2805 static int count_ah_combs(struct xfrm_tmpl *t)
2806 {
2807         int i, sz = 0;
2808
2809         for (i = 0; ; i++) {
2810                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2811                 if (!aalg)
2812                         break;
2813                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2814                         sz += sizeof(struct sadb_comb);
2815         }
2816         return sz + sizeof(struct sadb_prop);
2817 }
2818
2819 static int count_esp_combs(struct xfrm_tmpl *t)
2820 {
2821         int i, k, sz = 0;
2822
2823         for (i = 0; ; i++) {
2824                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2825                 if (!ealg)
2826                         break;
2827
2828                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2829                         continue;
2830
2831                 for (k = 1; ; k++) {
2832                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2833                         if (!aalg)
2834                                 break;
2835
2836                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2837                                 sz += sizeof(struct sadb_comb);
2838                 }
2839         }
2840         return sz + sizeof(struct sadb_prop);
2841 }
2842
2843 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2844 {
2845         struct sadb_prop *p;
2846         int i;
2847
2848         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2849         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2850         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2851         p->sadb_prop_replay = 32;
2852         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2853
2854         for (i = 0; ; i++) {
2855                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2856                 if (!aalg)
2857                         break;
2858
2859                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2860                         struct sadb_comb *c;
2861                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2862                         memset(c, 0, sizeof(*c));
2863                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2864                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2865                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2866                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2867                         c->sadb_comb_hard_addtime = 24*60*60;
2868                         c->sadb_comb_soft_addtime = 20*60*60;
2869                         c->sadb_comb_hard_usetime = 8*60*60;
2870                         c->sadb_comb_soft_usetime = 7*60*60;
2871                 }
2872         }
2873 }
2874
2875 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2876 {
2877         struct sadb_prop *p;
2878         int i, k;
2879
2880         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2881         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2882         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2883         p->sadb_prop_replay = 32;
2884         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2885
2886         for (i=0; ; i++) {
2887                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2888                 if (!ealg)
2889                         break;
2890
2891                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2892                         continue;
2893
2894                 for (k = 1; ; k++) {
2895                         struct sadb_comb *c;
2896                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2897                         if (!aalg)
2898                                 break;
2899                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2900                                 continue;
2901                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2902                         memset(c, 0, sizeof(*c));
2903                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2904                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2905                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2906                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2907                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2908                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2909                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2910                         c->sadb_comb_hard_addtime = 24*60*60;
2911                         c->sadb_comb_soft_addtime = 20*60*60;
2912                         c->sadb_comb_hard_usetime = 8*60*60;
2913                         c->sadb_comb_soft_usetime = 7*60*60;
2914                 }
2915         }
2916 }
2917
2918 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2919 {
2920         return 0;
2921 }
2922
2923 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2924 {
2925         struct sk_buff *out_skb;
2926         struct sadb_msg *out_hdr;
2927         int hard;
2928         int hsc;
2929
2930         hard = c->data.hard;
2931         if (hard)
2932                 hsc = 2;
2933         else
2934                 hsc = 1;
2935
2936         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2937         if (IS_ERR(out_skb))
2938                 return PTR_ERR(out_skb);
2939
2940         out_hdr = (struct sadb_msg *) out_skb->data;
2941         out_hdr->sadb_msg_version = PF_KEY_V2;
2942         out_hdr->sadb_msg_type = SADB_EXPIRE;
2943         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2944         out_hdr->sadb_msg_errno = 0;
2945         out_hdr->sadb_msg_reserved = 0;
2946         out_hdr->sadb_msg_seq = 0;
2947         out_hdr->sadb_msg_pid = 0;
2948
2949         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2950         return 0;
2951 }
2952
2953 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2954 {
2955         struct net *net = x ? xs_net(x) : c->net;
2956         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2957
2958         if (atomic_read(&net_pfkey->socks_nr) == 0)
2959                 return 0;
2960
2961         switch (c->event) {
2962         case XFRM_MSG_EXPIRE:
2963                 return key_notify_sa_expire(x, c);
2964         case XFRM_MSG_DELSA:
2965         case XFRM_MSG_NEWSA:
2966         case XFRM_MSG_UPDSA:
2967                 return key_notify_sa(x, c);
2968         case XFRM_MSG_FLUSHSA:
2969                 return key_notify_sa_flush(c);
2970         case XFRM_MSG_NEWAE: /* not yet supported */
2971                 break;
2972         default:
2973                 printk("pfkey: Unknown SA event %d\n", c->event);
2974                 break;
2975         }
2976
2977         return 0;
2978 }
2979
2980 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2981 {
2982         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2983                 return 0;
2984
2985         switch (c->event) {
2986         case XFRM_MSG_POLEXPIRE:
2987                 return key_notify_policy_expire(xp, c);
2988         case XFRM_MSG_DELPOLICY:
2989         case XFRM_MSG_NEWPOLICY:
2990         case XFRM_MSG_UPDPOLICY:
2991                 return key_notify_policy(xp, dir, c);
2992         case XFRM_MSG_FLUSHPOLICY:
2993                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2994                         break;
2995                 return key_notify_policy_flush(c);
2996         default:
2997                 printk("pfkey: Unknown policy event %d\n", c->event);
2998                 break;
2999         }
3000
3001         return 0;
3002 }
3003
3004 static u32 get_acqseq(void)
3005 {
3006         u32 res;
3007         static atomic_t acqseq;
3008
3009         do {
3010                 res = atomic_inc_return(&acqseq);
3011         } while (!res);
3012         return res;
3013 }
3014
3015 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3016 {
3017         struct sk_buff *skb;
3018         struct sadb_msg *hdr;
3019         struct sadb_address *addr;
3020         struct sadb_x_policy *pol;
3021         int sockaddr_size;
3022         int size;
3023         struct sadb_x_sec_ctx *sec_ctx;
3024         struct xfrm_sec_ctx *xfrm_ctx;
3025         int ctx_size = 0;
3026
3027         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3028         if (!sockaddr_size)
3029                 return -EINVAL;
3030
3031         size = sizeof(struct sadb_msg) +
3032                 (sizeof(struct sadb_address) * 2) +
3033                 (sockaddr_size * 2) +
3034                 sizeof(struct sadb_x_policy);
3035
3036         if (x->id.proto == IPPROTO_AH)
3037                 size += count_ah_combs(t);
3038         else if (x->id.proto == IPPROTO_ESP)
3039                 size += count_esp_combs(t);
3040
3041         if ((xfrm_ctx = x->security)) {
3042                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3043                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3044         }
3045
3046         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3047         if (skb == NULL)
3048                 return -ENOMEM;
3049
3050         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3051         hdr->sadb_msg_version = PF_KEY_V2;
3052         hdr->sadb_msg_type = SADB_ACQUIRE;
3053         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3054         hdr->sadb_msg_len = size / sizeof(uint64_t);
3055         hdr->sadb_msg_errno = 0;
3056         hdr->sadb_msg_reserved = 0;
3057         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3058         hdr->sadb_msg_pid = 0;
3059
3060         /* src address */
3061         addr = (struct sadb_address*) skb_put(skb,
3062                                               sizeof(struct sadb_address)+sockaddr_size);
3063         addr->sadb_address_len =
3064                 (sizeof(struct sadb_address)+sockaddr_size)/
3065                         sizeof(uint64_t);
3066         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3067         addr->sadb_address_proto = 0;
3068         addr->sadb_address_reserved = 0;
3069         addr->sadb_address_prefixlen =
3070                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3071                                     (struct sockaddr *) (addr + 1),
3072                                     x->props.family);
3073         if (!addr->sadb_address_prefixlen)
3074                 BUG();
3075
3076         /* dst address */
3077         addr = (struct sadb_address*) skb_put(skb,
3078                                               sizeof(struct sadb_address)+sockaddr_size);
3079         addr->sadb_address_len =
3080                 (sizeof(struct sadb_address)+sockaddr_size)/
3081                         sizeof(uint64_t);
3082         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3083         addr->sadb_address_proto = 0;
3084         addr->sadb_address_reserved = 0;
3085         addr->sadb_address_prefixlen =
3086                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3087                                     (struct sockaddr *) (addr + 1),
3088                                     x->props.family);
3089         if (!addr->sadb_address_prefixlen)
3090                 BUG();
3091
3092         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3093         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3094         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3095         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3096         pol->sadb_x_policy_dir = dir+1;
3097         pol->sadb_x_policy_id = xp->index;
3098
3099         /* Set sadb_comb's. */
3100         if (x->id.proto == IPPROTO_AH)
3101                 dump_ah_combs(skb, t);
3102         else if (x->id.proto == IPPROTO_ESP)
3103                 dump_esp_combs(skb, t);
3104
3105         /* security context */
3106         if (xfrm_ctx) {
3107                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3108                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3109                 sec_ctx->sadb_x_sec_len =
3110                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3111                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3112                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3113                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3114                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3115                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3116                        xfrm_ctx->ctx_len);
3117         }
3118
3119         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3120 }
3121
3122 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3123                                                 u8 *data, int len, int *dir)
3124 {
3125         struct net *net = sock_net(sk);
3126         struct xfrm_policy *xp;
3127         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3128         struct sadb_x_sec_ctx *sec_ctx;
3129
3130         switch (sk->sk_family) {
3131         case AF_INET:
3132                 if (opt != IP_IPSEC_POLICY) {
3133                         *dir = -EOPNOTSUPP;
3134                         return NULL;
3135                 }
3136                 break;
3137 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3138         case AF_INET6:
3139                 if (opt != IPV6_IPSEC_POLICY) {
3140                         *dir = -EOPNOTSUPP;
3141                         return NULL;
3142                 }
3143                 break;
3144 #endif
3145         default:
3146                 *dir = -EINVAL;
3147                 return NULL;
3148         }
3149
3150         *dir = -EINVAL;
3151
3152         if (len < sizeof(struct sadb_x_policy) ||
3153             pol->sadb_x_policy_len*8 > len ||
3154             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3155             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3156                 return NULL;
3157
3158         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3159         if (xp == NULL) {
3160                 *dir = -ENOBUFS;
3161                 return NULL;
3162         }
3163
3164         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3165                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3166
3167         xp->lft.soft_byte_limit = XFRM_INF;
3168         xp->lft.hard_byte_limit = XFRM_INF;
3169         xp->lft.soft_packet_limit = XFRM_INF;
3170         xp->lft.hard_packet_limit = XFRM_INF;
3171         xp->family = sk->sk_family;
3172
3173         xp->xfrm_nr = 0;
3174         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3175             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3176                 goto out;
3177
3178         /* security context too */
3179         if (len >= (pol->sadb_x_policy_len*8 +
3180             sizeof(struct sadb_x_sec_ctx))) {
3181                 char *p = (char *)pol;
3182                 struct xfrm_user_sec_ctx *uctx;
3183
3184                 p += pol->sadb_x_policy_len*8;
3185                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3186                 if (len < pol->sadb_x_policy_len*8 +
3187                     sec_ctx->sadb_x_sec_len) {
3188                         *dir = -EINVAL;
3189                         goto out;
3190                 }
3191                 if ((*dir = verify_sec_ctx_len(p)))
3192                         goto out;
3193                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3194                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3195                 kfree(uctx);
3196
3197                 if (*dir)
3198                         goto out;
3199         }
3200
3201         *dir = pol->sadb_x_policy_dir-1;
3202         return xp;
3203
3204 out:
3205         xp->walk.dead = 1;
3206         xfrm_policy_destroy(xp);
3207         return NULL;
3208 }
3209
3210 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3211 {
3212         struct sk_buff *skb;
3213         struct sadb_msg *hdr;
3214         struct sadb_sa *sa;
3215         struct sadb_address *addr;
3216         struct sadb_x_nat_t_port *n_port;
3217         int sockaddr_size;
3218         int size;
3219         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3220         struct xfrm_encap_tmpl *natt = NULL;
3221
3222         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3223         if (!sockaddr_size)
3224                 return -EINVAL;
3225
3226         if (!satype)
3227                 return -EINVAL;
3228
3229         if (!x->encap)
3230                 return -EINVAL;
3231
3232         natt = x->encap;
3233
3234         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3235          *
3236          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3237          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3238          */
3239
3240         size = sizeof(struct sadb_msg) +
3241                 sizeof(struct sadb_sa) +
3242                 (sizeof(struct sadb_address) * 2) +
3243                 (sockaddr_size * 2) +
3244                 (sizeof(struct sadb_x_nat_t_port) * 2);
3245
3246         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3247         if (skb == NULL)
3248                 return -ENOMEM;
3249
3250         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3251         hdr->sadb_msg_version = PF_KEY_V2;
3252         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3253         hdr->sadb_msg_satype = satype;
3254         hdr->sadb_msg_len = size / sizeof(uint64_t);
3255         hdr->sadb_msg_errno = 0;
3256         hdr->sadb_msg_reserved = 0;
3257         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3258         hdr->sadb_msg_pid = 0;
3259
3260         /* SA */
3261         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3262         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3263         sa->sadb_sa_exttype = SADB_EXT_SA;
3264         sa->sadb_sa_spi = x->id.spi;
3265         sa->sadb_sa_replay = 0;
3266         sa->sadb_sa_state = 0;
3267         sa->sadb_sa_auth = 0;
3268         sa->sadb_sa_encrypt = 0;
3269         sa->sadb_sa_flags = 0;
3270
3271         /* ADDRESS_SRC (old addr) */
3272         addr = (struct sadb_address*)
3273                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3274         addr->sadb_address_len =
3275                 (sizeof(struct sadb_address)+sockaddr_size)/
3276                         sizeof(uint64_t);
3277         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3278         addr->sadb_address_proto = 0;
3279         addr->sadb_address_reserved = 0;
3280         addr->sadb_address_prefixlen =
3281                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3282                                     (struct sockaddr *) (addr + 1),
3283                                     x->props.family);
3284         if (!addr->sadb_address_prefixlen)
3285                 BUG();
3286
3287         /* NAT_T_SPORT (old port) */
3288         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3289         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3290         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3291         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3292         n_port->sadb_x_nat_t_port_reserved = 0;
3293
3294         /* ADDRESS_DST (new addr) */
3295         addr = (struct sadb_address*)
3296                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3297         addr->sadb_address_len =
3298                 (sizeof(struct sadb_address)+sockaddr_size)/
3299                         sizeof(uint64_t);
3300         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3301         addr->sadb_address_proto = 0;
3302         addr->sadb_address_reserved = 0;
3303         addr->sadb_address_prefixlen =
3304                 pfkey_sockaddr_fill(ipaddr, 0,
3305                                     (struct sockaddr *) (addr + 1),
3306                                     x->props.family);
3307         if (!addr->sadb_address_prefixlen)
3308                 BUG();
3309
3310         /* NAT_T_DPORT (new port) */
3311         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3312         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3313         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3314         n_port->sadb_x_nat_t_port_port = sport;
3315         n_port->sadb_x_nat_t_port_reserved = 0;
3316
3317         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3318 }
3319
3320 #ifdef CONFIG_NET_KEY_MIGRATE
3321 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3322                             struct xfrm_selector *sel)
3323 {
3324         struct sadb_address *addr;
3325         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3326         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3327         addr->sadb_address_exttype = type;
3328         addr->sadb_address_proto = sel->proto;
3329         addr->sadb_address_reserved = 0;
3330
3331         switch (type) {
3332         case SADB_EXT_ADDRESS_SRC:
3333                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3334                 pfkey_sockaddr_fill(&sel->saddr, 0,
3335                                     (struct sockaddr *)(addr + 1),
3336                                     sel->family);
3337                 break;
3338         case SADB_EXT_ADDRESS_DST:
3339                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3340                 pfkey_sockaddr_fill(&sel->daddr, 0,
3341                                     (struct sockaddr *)(addr + 1),
3342                                     sel->family);
3343                 break;
3344         default:
3345                 return -EINVAL;
3346         }
3347
3348         return 0;
3349 }
3350
3351
3352 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3353 {
3354         struct sadb_x_kmaddress *kma;
3355         u8 *sa;
3356         int family = k->family;
3357         int socklen = pfkey_sockaddr_len(family);
3358         int size_req;
3359
3360         size_req = (sizeof(struct sadb_x_kmaddress) +
3361                     pfkey_sockaddr_pair_size(family));
3362
3363         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3364         memset(kma, 0, size_req);
3365         kma->sadb_x_kmaddress_len = size_req / 8;
3366         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3367         kma->sadb_x_kmaddress_reserved = k->reserved;
3368
3369         sa = (u8 *)(kma + 1);
3370         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3371             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3372                 return -EINVAL;
3373
3374         return 0;
3375 }
3376
3377 static int set_ipsecrequest(struct sk_buff *skb,
3378                             uint8_t proto, uint8_t mode, int level,
3379                             uint32_t reqid, uint8_t family,
3380                             xfrm_address_t *src, xfrm_address_t *dst)
3381 {
3382         struct sadb_x_ipsecrequest *rq;
3383         u8 *sa;
3384         int socklen = pfkey_sockaddr_len(family);
3385         int size_req;
3386
3387         size_req = sizeof(struct sadb_x_ipsecrequest) +
3388                    pfkey_sockaddr_pair_size(family);
3389
3390         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3391         memset(rq, 0, size_req);
3392         rq->sadb_x_ipsecrequest_len = size_req;
3393         rq->sadb_x_ipsecrequest_proto = proto;
3394         rq->sadb_x_ipsecrequest_mode = mode;
3395         rq->sadb_x_ipsecrequest_level = level;
3396         rq->sadb_x_ipsecrequest_reqid = reqid;
3397
3398         sa = (u8 *) (rq + 1);
3399         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3400             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3401                 return -EINVAL;
3402
3403         return 0;
3404 }
3405 #endif
3406
3407 #ifdef CONFIG_NET_KEY_MIGRATE
3408 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3409                               struct xfrm_migrate *m, int num_bundles,
3410                               struct xfrm_kmaddress *k)
3411 {
3412         int i;
3413         int sasize_sel;
3414         int size = 0;
3415         int size_pol = 0;
3416         struct sk_buff *skb;
3417         struct sadb_msg *hdr;
3418         struct sadb_x_policy *pol;
3419         struct xfrm_migrate *mp;
3420
3421         if (type != XFRM_POLICY_TYPE_MAIN)
3422                 return 0;
3423
3424         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3425                 return -EINVAL;
3426
3427         if (k != NULL) {
3428                 /* addresses for KM */
3429                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3430                                      pfkey_sockaddr_pair_size(k->family));
3431         }
3432
3433         /* selector */
3434         sasize_sel = pfkey_sockaddr_size(sel->family);
3435         if (!sasize_sel)
3436                 return -EINVAL;
3437         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3438
3439         /* policy info */
3440         size_pol += sizeof(struct sadb_x_policy);
3441
3442         /* ipsecrequests */
3443         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3444                 /* old locator pair */
3445                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3446                             pfkey_sockaddr_pair_size(mp->old_family);
3447                 /* new locator pair */
3448                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3449                             pfkey_sockaddr_pair_size(mp->new_family);
3450         }
3451
3452         size += sizeof(struct sadb_msg) + size_pol;
3453
3454         /* alloc buffer */
3455         skb = alloc_skb(size, GFP_ATOMIC);
3456         if (skb == NULL)
3457                 return -ENOMEM;
3458
3459         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3460         hdr->sadb_msg_version = PF_KEY_V2;
3461         hdr->sadb_msg_type = SADB_X_MIGRATE;
3462         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3463         hdr->sadb_msg_len = size / 8;
3464         hdr->sadb_msg_errno = 0;
3465         hdr->sadb_msg_reserved = 0;
3466         hdr->sadb_msg_seq = 0;
3467         hdr->sadb_msg_pid = 0;
3468
3469         /* Addresses to be used by KM for negotiation, if ext is available */
3470         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3471                 return -EINVAL;
3472
3473         /* selector src */
3474         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3475
3476         /* selector dst */
3477         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3478
3479         /* policy information */
3480         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3481         pol->sadb_x_policy_len = size_pol / 8;
3482         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3483         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3484         pol->sadb_x_policy_dir = dir + 1;
3485         pol->sadb_x_policy_id = 0;
3486         pol->sadb_x_policy_priority = 0;
3487
3488         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3489                 /* old ipsecrequest */
3490                 int mode = pfkey_mode_from_xfrm(mp->mode);
3491                 if (mode < 0)
3492                         goto err;
3493                 if (set_ipsecrequest(skb, mp->proto, mode,
3494                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3495                                      mp->reqid, mp->old_family,
3496                                      &mp->old_saddr, &mp->old_daddr) < 0)
3497                         goto err;
3498
3499                 /* new ipsecrequest */
3500                 if (set_ipsecrequest(skb, mp->proto, mode,
3501                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3502                                      mp->reqid, mp->new_family,
3503                                      &mp->new_saddr, &mp->new_daddr) < 0)
3504                         goto err;
3505         }
3506
3507         /* broadcast migrate message to sockets */
3508         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3509
3510         return 0;
3511
3512 err:
3513         kfree_skb(skb);
3514         return -EINVAL;
3515 }
3516 #else
3517 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3518                               struct xfrm_migrate *m, int num_bundles,
3519                               struct xfrm_kmaddress *k)
3520 {
3521         return -ENOPROTOOPT;
3522 }
3523 #endif
3524
3525 static int pfkey_sendmsg(struct kiocb *kiocb,
3526                          struct socket *sock, struct msghdr *msg, size_t len)
3527 {
3528         struct sock *sk = sock->sk;
3529         struct sk_buff *skb = NULL;
3530         struct sadb_msg *hdr = NULL;
3531         int err;
3532
3533         err = -EOPNOTSUPP;
3534         if (msg->msg_flags & MSG_OOB)
3535                 goto out;
3536
3537         err = -EMSGSIZE;
3538         if ((unsigned)len > sk->sk_sndbuf - 32)
3539                 goto out;
3540
3541         err = -ENOBUFS;
3542         skb = alloc_skb(len, GFP_KERNEL);
3543         if (skb == NULL)
3544                 goto out;
3545
3546         err = -EFAULT;
3547         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3548                 goto out;
3549
3550         hdr = pfkey_get_base_msg(skb, &err);
3551         if (!hdr)
3552                 goto out;
3553
3554         mutex_lock(&xfrm_cfg_mutex);
3555         err = pfkey_process(sk, skb, hdr);
3556         mutex_unlock(&xfrm_cfg_mutex);
3557
3558 out:
3559         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3560                 err = 0;
3561         kfree_skb(skb);
3562
3563         return err ? : len;
3564 }
3565
3566 static int pfkey_recvmsg(struct kiocb *kiocb,
3567                          struct socket *sock, struct msghdr *msg, size_t len,
3568                          int flags)
3569 {
3570         struct sock *sk = sock->sk;
3571         struct pfkey_sock *pfk = pfkey_sk(sk);
3572         struct sk_buff *skb;
3573         int copied, err;
3574
3575         err = -EINVAL;
3576         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3577                 goto out;
3578
3579         msg->msg_namelen = 0;
3580         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3581         if (skb == NULL)
3582                 goto out;
3583
3584         copied = skb->len;
3585         if (copied > len) {
3586                 msg->msg_flags |= MSG_TRUNC;
3587                 copied = len;
3588         }
3589
3590         skb_reset_transport_header(skb);
3591         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3592         if (err)
3593                 goto out_free;
3594
3595         sock_recv_ts_and_drops(msg, sk, skb);
3596
3597         err = (flags & MSG_TRUNC) ? skb->len : copied;
3598
3599         if (pfk->dump.dump != NULL &&
3600             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3601                 pfkey_do_dump(pfk);
3602
3603 out_free:
3604         skb_free_datagram(sk, skb);
3605 out:
3606         return err;
3607 }
3608
3609 static const struct proto_ops pfkey_ops = {
3610         .family         =       PF_KEY,
3611         .owner          =       THIS_MODULE,
3612         /* Operations that make no sense on pfkey sockets. */
3613         .bind           =       sock_no_bind,
3614         .connect        =       sock_no_connect,
3615         .socketpair     =       sock_no_socketpair,
3616         .accept         =       sock_no_accept,
3617         .getname        =       sock_no_getname,
3618         .ioctl          =       sock_no_ioctl,
3619         .listen         =       sock_no_listen,
3620         .shutdown       =       sock_no_shutdown,
3621         .setsockopt     =       sock_no_setsockopt,
3622         .getsockopt     =       sock_no_getsockopt,
3623         .mmap           =       sock_no_mmap,
3624         .sendpage       =       sock_no_sendpage,
3625
3626         /* Now the operations that really occur. */
3627         .release        =       pfkey_release,
3628         .poll           =       datagram_poll,
3629         .sendmsg        =       pfkey_sendmsg,
3630         .recvmsg        =       pfkey_recvmsg,
3631 };
3632
3633 static const struct net_proto_family pfkey_family_ops = {
3634         .family =       PF_KEY,
3635         .create =       pfkey_create,
3636         .owner  =       THIS_MODULE,
3637 };
3638
3639 #ifdef CONFIG_PROC_FS
3640 static int pfkey_seq_show(struct seq_file *f, void *v)
3641 {
3642         struct sock *s = sk_entry(v);
3643
3644         if (v == SEQ_START_TOKEN)
3645                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3646         else
3647                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3648                                s,
3649                                atomic_read(&s->sk_refcnt),
3650                                sk_rmem_alloc_get(s),
3651                                sk_wmem_alloc_get(s),
3652                                sock_i_uid(s),
3653                                sock_i_ino(s)
3654                                );
3655         return 0;
3656 }
3657
3658 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3659 {
3660         struct net *net = seq_file_net(f);
3661         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3662
3663         rcu_read_lock();
3664         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3665 }
3666
3667 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3668 {
3669         struct net *net = seq_file_net(f);
3670         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3671
3672         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3673 }
3674
3675 static void pfkey_seq_stop(struct seq_file *f, void *v)
3676 {
3677         rcu_read_unlock();
3678 }
3679
3680 static const struct seq_operations pfkey_seq_ops = {
3681         .start  = pfkey_seq_start,
3682         .next   = pfkey_seq_next,
3683         .stop   = pfkey_seq_stop,
3684         .show   = pfkey_seq_show,
3685 };
3686
3687 static int pfkey_seq_open(struct inode *inode, struct file *file)
3688 {
3689         return seq_open_net(inode, file, &pfkey_seq_ops,
3690                             sizeof(struct seq_net_private));
3691 }
3692
3693 static const struct file_operations pfkey_proc_ops = {
3694         .open    = pfkey_seq_open,
3695         .read    = seq_read,
3696         .llseek  = seq_lseek,
3697         .release = seq_release_net,
3698 };
3699
3700 static int __net_init pfkey_init_proc(struct net *net)
3701 {
3702         struct proc_dir_entry *e;
3703
3704         e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3705         if (e == NULL)
3706                 return -ENOMEM;
3707
3708         return 0;
3709 }
3710
3711 static void __net_exit pfkey_exit_proc(struct net *net)
3712 {
3713         proc_net_remove(net, "pfkey");
3714 }
3715 #else
3716 static inline int pfkey_init_proc(struct net *net)
3717 {
3718         return 0;
3719 }
3720
3721 static inline void pfkey_exit_proc(struct net *net)
3722 {
3723 }
3724 #endif
3725
3726 static struct xfrm_mgr pfkeyv2_mgr =
3727 {
3728         .id             = "pfkeyv2",
3729         .notify         = pfkey_send_notify,
3730         .acquire        = pfkey_send_acquire,
3731         .compile_policy = pfkey_compile_policy,
3732         .new_mapping    = pfkey_send_new_mapping,
3733         .notify_policy  = pfkey_send_policy_notify,
3734         .migrate        = pfkey_send_migrate,
3735 };
3736
3737 static int __net_init pfkey_net_init(struct net *net)
3738 {
3739         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3740         int rv;
3741
3742         INIT_HLIST_HEAD(&net_pfkey->table);
3743         atomic_set(&net_pfkey->socks_nr, 0);
3744
3745         rv = pfkey_init_proc(net);
3746
3747         return rv;
3748 }
3749
3750 static void __net_exit pfkey_net_exit(struct net *net)
3751 {
3752         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3753
3754         pfkey_exit_proc(net);
3755         BUG_ON(!hlist_empty(&net_pfkey->table));
3756 }
3757
3758 static struct pernet_operations pfkey_net_ops = {
3759         .init = pfkey_net_init,
3760         .exit = pfkey_net_exit,
3761         .id   = &pfkey_net_id,
3762         .size = sizeof(struct netns_pfkey),
3763 };
3764
3765 static void __exit ipsec_pfkey_exit(void)
3766 {
3767         xfrm_unregister_km(&pfkeyv2_mgr);
3768         sock_unregister(PF_KEY);
3769         unregister_pernet_subsys(&pfkey_net_ops);
3770         proto_unregister(&key_proto);
3771 }
3772
3773 static int __init ipsec_pfkey_init(void)
3774 {
3775         int err = proto_register(&key_proto, 0);
3776
3777         if (err != 0)
3778                 goto out;
3779
3780         err = register_pernet_subsys(&pfkey_net_ops);
3781         if (err != 0)
3782                 goto out_unregister_key_proto;
3783         err = sock_register(&pfkey_family_ops);
3784         if (err != 0)
3785                 goto out_unregister_pernet;
3786         err = xfrm_register_km(&pfkeyv2_mgr);
3787         if (err != 0)
3788                 goto out_sock_unregister;
3789 out:
3790         return err;
3791
3792 out_sock_unregister:
3793         sock_unregister(PF_KEY);
3794 out_unregister_pernet:
3795         unregister_pernet_subsys(&pfkey_net_ops);
3796 out_unregister_key_proto:
3797         proto_unregister(&key_proto);
3798         goto out;
3799 }
3800
3801 module_init(ipsec_pfkey_init);
3802 module_exit(ipsec_pfkey_exit);
3803 MODULE_LICENSE("GPL");
3804 MODULE_ALIAS_NETPROTO(PF_KEY);