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