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