Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
[pandora-kernel.git] / net / key / af_key.c
1 /*
2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
3  *
4  *              This program is free software; you can redistribute it and/or
5  *              modify it under the terms of the GNU General Public License
6  *              as published by the Free Software Foundation; either version
7  *              2 of the License, or (at your option) any later version.
8  *
9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
10  *              David S. Miller <davem@redhat.com>
11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
14  *              Derek Atkins <derek@ihtfp.com>
15  */
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/socket.h>
21 #include <linux/pfkeyv2.h>
22 #include <linux/ipsec.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25 #include <linux/in.h>
26 #include <linux/in6.h>
27 #include <linux/proc_fs.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <net/net_namespace.h>
31 #include <net/netns/generic.h>
32 #include <net/xfrm.h>
33
34 #include <net/sock.h>
35
36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
38
39 static int pfkey_net_id __read_mostly;
40 struct netns_pfkey {
41         /* List of all pfkey sockets. */
42         struct hlist_head table;
43         atomic_t socks_nr;
44 };
45 static DEFINE_MUTEX(pfkey_mutex);
46
47 #define DUMMY_MARK 0
48 static struct xfrm_mark dummy_mark = {0, 0};
49 struct pfkey_sock {
50         /* struct sock must be the first member of struct pfkey_sock */
51         struct sock     sk;
52         int             registered;
53         int             promisc;
54
55         struct {
56                 uint8_t         msg_version;
57                 uint32_t        msg_portid;
58                 int             (*dump)(struct pfkey_sock *sk);
59                 void            (*done)(struct pfkey_sock *sk);
60                 union {
61                         struct xfrm_policy_walk policy;
62                         struct xfrm_state_walk  state;
63                 } u;
64                 struct sk_buff  *skb;
65         } dump;
66 };
67
68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
69 {
70         return (struct pfkey_sock *)sk;
71 }
72
73 static int pfkey_can_dump(const struct sock *sk)
74 {
75         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
76                 return 1;
77         return 0;
78 }
79
80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
81 {
82         if (pfk->dump.dump) {
83                 if (pfk->dump.skb) {
84                         kfree_skb(pfk->dump.skb);
85                         pfk->dump.skb = NULL;
86                 }
87                 pfk->dump.done(pfk);
88                 pfk->dump.dump = NULL;
89                 pfk->dump.done = NULL;
90         }
91 }
92
93 static void pfkey_sock_destruct(struct sock *sk)
94 {
95         struct net *net = sock_net(sk);
96         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
97
98         pfkey_terminate_dump(pfkey_sk(sk));
99         skb_queue_purge(&sk->sk_receive_queue);
100
101         if (!sock_flag(sk, SOCK_DEAD)) {
102                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
103                 return;
104         }
105
106         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
107         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
108
109         atomic_dec(&net_pfkey->socks_nr);
110 }
111
112 static const struct proto_ops pfkey_ops;
113
114 static void pfkey_insert(struct sock *sk)
115 {
116         struct net *net = sock_net(sk);
117         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
118
119         mutex_lock(&pfkey_mutex);
120         sk_add_node_rcu(sk, &net_pfkey->table);
121         mutex_unlock(&pfkey_mutex);
122 }
123
124 static void pfkey_remove(struct sock *sk)
125 {
126         mutex_lock(&pfkey_mutex);
127         sk_del_node_init_rcu(sk);
128         mutex_unlock(&pfkey_mutex);
129 }
130
131 static struct proto key_proto = {
132         .name     = "KEY",
133         .owner    = THIS_MODULE,
134         .obj_size = sizeof(struct pfkey_sock),
135 };
136
137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
138                         int kern)
139 {
140         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
141         struct sock *sk;
142         int err;
143
144         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
145                 return -EPERM;
146         if (sock->type != SOCK_RAW)
147                 return -ESOCKTNOSUPPORT;
148         if (protocol != PF_KEY_V2)
149                 return -EPROTONOSUPPORT;
150
151         err = -ENOMEM;
152         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
153         if (sk == NULL)
154                 goto out;
155
156         sock->ops = &pfkey_ops;
157         sock_init_data(sock, sk);
158
159         sk->sk_family = PF_KEY;
160         sk->sk_destruct = pfkey_sock_destruct;
161
162         atomic_inc(&net_pfkey->socks_nr);
163
164         pfkey_insert(sk);
165
166         return 0;
167 out:
168         return err;
169 }
170
171 static int pfkey_release(struct socket *sock)
172 {
173         struct sock *sk = sock->sk;
174
175         if (!sk)
176                 return 0;
177
178         pfkey_remove(sk);
179
180         sock_orphan(sk);
181         sock->sk = NULL;
182         skb_queue_purge(&sk->sk_write_queue);
183
184         synchronize_rcu();
185         sock_put(sk);
186
187         return 0;
188 }
189
190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
191                                gfp_t allocation, struct sock *sk)
192 {
193         int err = -ENOBUFS;
194
195         sock_hold(sk);
196         if (*skb2 == NULL) {
197                 if (atomic_read(&skb->users) != 1) {
198                         *skb2 = skb_clone(skb, allocation);
199                 } else {
200                         *skb2 = skb;
201                         atomic_inc(&skb->users);
202                 }
203         }
204         if (*skb2 != NULL) {
205                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
206                         skb_set_owner_r(*skb2, sk);
207                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
208                         sk->sk_data_ready(sk, (*skb2)->len);
209                         *skb2 = NULL;
210                         err = 0;
211                 }
212         }
213         sock_put(sk);
214         return err;
215 }
216
217 /* Send SKB to all pfkey sockets matching selected criteria.  */
218 #define BROADCAST_ALL           0
219 #define BROADCAST_ONE           1
220 #define BROADCAST_REGISTERED    2
221 #define BROADCAST_PROMISC_ONLY  4
222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
223                            int broadcast_flags, struct sock *one_sk,
224                            struct net *net)
225 {
226         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227         struct sock *sk;
228         struct sk_buff *skb2 = NULL;
229         int err = -ESRCH;
230
231         /* XXX Do we need something like netlink_overrun?  I think
232          * XXX PF_KEY socket apps will not mind current behavior.
233          */
234         if (!skb)
235                 return -ENOMEM;
236
237         rcu_read_lock();
238         sk_for_each_rcu(sk, &net_pfkey->table) {
239                 struct pfkey_sock *pfk = pfkey_sk(sk);
240                 int err2;
241
242                 /* Yes, it means that if you are meant to receive this
243                  * pfkey message you receive it twice as promiscuous
244                  * socket.
245                  */
246                 if (pfk->promisc)
247                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
248
249                 /* the exact target will be processed later */
250                 if (sk == one_sk)
251                         continue;
252                 if (broadcast_flags != BROADCAST_ALL) {
253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254                                 continue;
255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
256                             !pfk->registered)
257                                 continue;
258                         if (broadcast_flags & BROADCAST_ONE)
259                                 continue;
260                 }
261
262                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263
264                 /* Error is cleare after succecful sending to at least one
265                  * registered KM */
266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267                         err = err2;
268         }
269         rcu_read_unlock();
270
271         if (one_sk != NULL)
272                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273
274         kfree_skb(skb2);
275         kfree_skb(skb);
276         return err;
277 }
278
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281         struct sadb_msg *hdr;
282         int rc;
283
284         rc = pfk->dump.dump(pfk);
285         if (rc == -ENOBUFS)
286                 return 0;
287
288         if (pfk->dump.skb) {
289                 if (!pfkey_can_dump(&pfk->sk))
290                         return 0;
291
292                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293                 hdr->sadb_msg_seq = 0;
294                 hdr->sadb_msg_errno = rc;
295                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296                                 &pfk->sk, sock_net(&pfk->sk));
297                 pfk->dump.skb = NULL;
298         }
299
300         pfkey_terminate_dump(pfk);
301         return rc;
302 }
303
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305                                  const struct sadb_msg *orig)
306 {
307         *new = *orig;
308 }
309
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313         struct sadb_msg *hdr;
314
315         if (!skb)
316                 return -ENOBUFS;
317
318         /* Woe be to the platform trying to support PFKEY yet
319          * having normal errnos outside the 1-255 range, inclusive.
320          */
321         err = -err;
322         if (err == ERESTARTSYS ||
323             err == ERESTARTNOHAND ||
324             err == ERESTARTNOINTR)
325                 err = EINTR;
326         if (err >= 512)
327                 err = EINVAL;
328         BUG_ON(err <= 0 || err >= 256);
329
330         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331         pfkey_hdr_dup(hdr, orig);
332         hdr->sadb_msg_errno = (uint8_t) err;
333         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334                              sizeof(uint64_t));
335
336         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337
338         return 0;
339 }
340
341 static u8 sadb_ext_min_len[] = {
342         [SADB_EXT_RESERVED]             = (u8) 0,
343         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
344         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
345         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
346         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
347         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
348         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
349         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
350         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
351         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
352         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
353         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
354         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
355         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
356         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
357         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
358         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
359         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
360         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
361         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
362         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
363         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
364         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
365         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
366         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
367         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
368 };
369
370 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
371 static int verify_address_len(const void *p)
372 {
373         const struct sadb_address *sp = p;
374         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
375         const struct sockaddr_in *sin;
376 #if IS_ENABLED(CONFIG_IPV6)
377         const struct sockaddr_in6 *sin6;
378 #endif
379         int len;
380
381         switch (addr->sa_family) {
382         case AF_INET:
383                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
384                 if (sp->sadb_address_len != len ||
385                     sp->sadb_address_prefixlen > 32)
386                         return -EINVAL;
387                 break;
388 #if IS_ENABLED(CONFIG_IPV6)
389         case AF_INET6:
390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
391                 if (sp->sadb_address_len != len ||
392                     sp->sadb_address_prefixlen > 128)
393                         return -EINVAL;
394                 break;
395 #endif
396         default:
397                 /* It is user using kernel to keep track of security
398                  * associations for another protocol, such as
399                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
400                  * lengths.
401                  *
402                  * XXX Actually, association/policy database is not yet
403                  * XXX able to cope with arbitrary sockaddr families.
404                  * XXX When it can, remove this -EINVAL.  -DaveM
405                  */
406                 return -EINVAL;
407                 break;
408         }
409
410         return 0;
411 }
412
413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
414 {
415         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
416                             sec_ctx->sadb_x_ctx_len,
417                             sizeof(uint64_t));
418 }
419
420 static inline int verify_sec_ctx_len(const void *p)
421 {
422         const struct sadb_x_sec_ctx *sec_ctx = p;
423         int len = sec_ctx->sadb_x_ctx_len;
424
425         if (len > PAGE_SIZE)
426                 return -EINVAL;
427
428         len = pfkey_sec_ctx_len(sec_ctx);
429
430         if (sec_ctx->sadb_x_sec_len != len)
431                 return -EINVAL;
432
433         return 0;
434 }
435
436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
437 {
438         struct xfrm_user_sec_ctx *uctx = NULL;
439         int ctx_size = sec_ctx->sadb_x_ctx_len;
440
441         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
442
443         if (!uctx)
444                 return NULL;
445
446         uctx->len = pfkey_sec_ctx_len(sec_ctx);
447         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
448         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
449         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
450         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
451         memcpy(uctx + 1, sec_ctx + 1,
452                uctx->ctx_len);
453
454         return uctx;
455 }
456
457 static int present_and_same_family(const struct sadb_address *src,
458                                    const struct sadb_address *dst)
459 {
460         const struct sockaddr *s_addr, *d_addr;
461
462         if (!src || !dst)
463                 return 0;
464
465         s_addr = (const struct sockaddr *)(src + 1);
466         d_addr = (const struct sockaddr *)(dst + 1);
467         if (s_addr->sa_family != d_addr->sa_family)
468                 return 0;
469         if (s_addr->sa_family != AF_INET
470 #if IS_ENABLED(CONFIG_IPV6)
471             && s_addr->sa_family != AF_INET6
472 #endif
473                 )
474                 return 0;
475
476         return 1;
477 }
478
479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
480 {
481         const char *p = (char *) hdr;
482         int len = skb->len;
483
484         len -= sizeof(*hdr);
485         p += sizeof(*hdr);
486         while (len > 0) {
487                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
488                 uint16_t ext_type;
489                 int ext_len;
490
491                 ext_len  = ehdr->sadb_ext_len;
492                 ext_len *= sizeof(uint64_t);
493                 ext_type = ehdr->sadb_ext_type;
494                 if (ext_len < sizeof(uint64_t) ||
495                     ext_len > len ||
496                     ext_type == SADB_EXT_RESERVED)
497                         return -EINVAL;
498
499                 if (ext_type <= SADB_EXT_MAX) {
500                         int min = (int) sadb_ext_min_len[ext_type];
501                         if (ext_len < min)
502                                 return -EINVAL;
503                         if (ext_hdrs[ext_type-1] != NULL)
504                                 return -EINVAL;
505                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
506                             ext_type == SADB_EXT_ADDRESS_DST ||
507                             ext_type == SADB_EXT_ADDRESS_PROXY ||
508                             ext_type == SADB_X_EXT_NAT_T_OA) {
509                                 if (verify_address_len(p))
510                                         return -EINVAL;
511                         }
512                         if (ext_type == SADB_X_EXT_SEC_CTX) {
513                                 if (verify_sec_ctx_len(p))
514                                         return -EINVAL;
515                         }
516                         ext_hdrs[ext_type-1] = (void *) p;
517                 }
518                 p   += ext_len;
519                 len -= ext_len;
520         }
521
522         return 0;
523 }
524
525 static uint16_t
526 pfkey_satype2proto(uint8_t satype)
527 {
528         switch (satype) {
529         case SADB_SATYPE_UNSPEC:
530                 return IPSEC_PROTO_ANY;
531         case SADB_SATYPE_AH:
532                 return IPPROTO_AH;
533         case SADB_SATYPE_ESP:
534                 return IPPROTO_ESP;
535         case SADB_X_SATYPE_IPCOMP:
536                 return IPPROTO_COMP;
537                 break;
538         default:
539                 return 0;
540         }
541         /* NOTREACHED */
542 }
543
544 static uint8_t
545 pfkey_proto2satype(uint16_t proto)
546 {
547         switch (proto) {
548         case IPPROTO_AH:
549                 return SADB_SATYPE_AH;
550         case IPPROTO_ESP:
551                 return SADB_SATYPE_ESP;
552         case IPPROTO_COMP:
553                 return SADB_X_SATYPE_IPCOMP;
554                 break;
555         default:
556                 return 0;
557         }
558         /* NOTREACHED */
559 }
560
561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
562  * say specifically 'just raw sockets' as we encode them as 255.
563  */
564
565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
566 {
567         return proto == IPSEC_PROTO_ANY ? 0 : proto;
568 }
569
570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
571 {
572         return proto ? proto : IPSEC_PROTO_ANY;
573 }
574
575 static inline int pfkey_sockaddr_len(sa_family_t family)
576 {
577         switch (family) {
578         case AF_INET:
579                 return sizeof(struct sockaddr_in);
580 #if IS_ENABLED(CONFIG_IPV6)
581         case AF_INET6:
582                 return sizeof(struct sockaddr_in6);
583 #endif
584         }
585         return 0;
586 }
587
588 static
589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
590 {
591         switch (sa->sa_family) {
592         case AF_INET:
593                 xaddr->a4 =
594                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
595                 return AF_INET;
596 #if IS_ENABLED(CONFIG_IPV6)
597         case AF_INET6:
598                 memcpy(xaddr->a6,
599                        &((struct sockaddr_in6 *)sa)->sin6_addr,
600                        sizeof(struct in6_addr));
601                 return AF_INET6;
602 #endif
603         }
604         return 0;
605 }
606
607 static
608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
609 {
610         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
611                                       xaddr);
612 }
613
614 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
615 {
616         const struct sadb_sa *sa;
617         const struct sadb_address *addr;
618         uint16_t proto;
619         unsigned short family;
620         xfrm_address_t *xaddr;
621
622         sa = ext_hdrs[SADB_EXT_SA - 1];
623         if (sa == NULL)
624                 return NULL;
625
626         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
627         if (proto == 0)
628                 return NULL;
629
630         /* sadb_address_len should be checked by caller */
631         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
632         if (addr == NULL)
633                 return NULL;
634
635         family = ((const struct sockaddr *)(addr + 1))->sa_family;
636         switch (family) {
637         case AF_INET:
638                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
639                 break;
640 #if IS_ENABLED(CONFIG_IPV6)
641         case AF_INET6:
642                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
643                 break;
644 #endif
645         default:
646                 xaddr = NULL;
647         }
648
649         if (!xaddr)
650                 return NULL;
651
652         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
653 }
654
655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
656
657 static int
658 pfkey_sockaddr_size(sa_family_t family)
659 {
660         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
661 }
662
663 static inline int pfkey_mode_from_xfrm(int mode)
664 {
665         switch(mode) {
666         case XFRM_MODE_TRANSPORT:
667                 return IPSEC_MODE_TRANSPORT;
668         case XFRM_MODE_TUNNEL:
669                 return IPSEC_MODE_TUNNEL;
670         case XFRM_MODE_BEET:
671                 return IPSEC_MODE_BEET;
672         default:
673                 return -1;
674         }
675 }
676
677 static inline int pfkey_mode_to_xfrm(int mode)
678 {
679         switch(mode) {
680         case IPSEC_MODE_ANY:    /*XXX*/
681         case IPSEC_MODE_TRANSPORT:
682                 return XFRM_MODE_TRANSPORT;
683         case IPSEC_MODE_TUNNEL:
684                 return XFRM_MODE_TUNNEL;
685         case IPSEC_MODE_BEET:
686                 return XFRM_MODE_BEET;
687         default:
688                 return -1;
689         }
690 }
691
692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
693                                         struct sockaddr *sa,
694                                         unsigned short family)
695 {
696         switch (family) {
697         case AF_INET:
698             {
699                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
700                 sin->sin_family = AF_INET;
701                 sin->sin_port = port;
702                 sin->sin_addr.s_addr = xaddr->a4;
703                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
704                 return 32;
705             }
706 #if IS_ENABLED(CONFIG_IPV6)
707         case AF_INET6:
708             {
709                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
710                 sin6->sin6_family = AF_INET6;
711                 sin6->sin6_port = port;
712                 sin6->sin6_flowinfo = 0;
713                 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
714                 sin6->sin6_scope_id = 0;
715                 return 128;
716             }
717 #endif
718         }
719         return 0;
720 }
721
722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
723                                               int add_keys, int hsc)
724 {
725         struct sk_buff *skb;
726         struct sadb_msg *hdr;
727         struct sadb_sa *sa;
728         struct sadb_lifetime *lifetime;
729         struct sadb_address *addr;
730         struct sadb_key *key;
731         struct sadb_x_sa2 *sa2;
732         struct sadb_x_sec_ctx *sec_ctx;
733         struct xfrm_sec_ctx *xfrm_ctx;
734         int ctx_size = 0;
735         int size;
736         int auth_key_size = 0;
737         int encrypt_key_size = 0;
738         int sockaddr_size;
739         struct xfrm_encap_tmpl *natt = NULL;
740         int mode;
741
742         /* address family check */
743         sockaddr_size = pfkey_sockaddr_size(x->props.family);
744         if (!sockaddr_size)
745                 return ERR_PTR(-EINVAL);
746
747         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
748            key(AE), (identity(SD),) (sensitivity)> */
749         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
750                 sizeof(struct sadb_lifetime) +
751                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
752                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
753                         sizeof(struct sadb_address)*2 +
754                                 sockaddr_size*2 +
755                                         sizeof(struct sadb_x_sa2);
756
757         if ((xfrm_ctx = x->security)) {
758                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
759                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
760         }
761
762         /* identity & sensitivity */
763         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
764                 size += sizeof(struct sadb_address) + sockaddr_size;
765
766         if (add_keys) {
767                 if (x->aalg && x->aalg->alg_key_len) {
768                         auth_key_size =
769                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
770                         size += sizeof(struct sadb_key) + auth_key_size;
771                 }
772                 if (x->ealg && x->ealg->alg_key_len) {
773                         encrypt_key_size =
774                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
775                         size += sizeof(struct sadb_key) + encrypt_key_size;
776                 }
777         }
778         if (x->encap)
779                 natt = x->encap;
780
781         if (natt && natt->encap_type) {
782                 size += sizeof(struct sadb_x_nat_t_type);
783                 size += sizeof(struct sadb_x_nat_t_port);
784                 size += sizeof(struct sadb_x_nat_t_port);
785         }
786
787         skb =  alloc_skb(size + 16, GFP_ATOMIC);
788         if (skb == NULL)
789                 return ERR_PTR(-ENOBUFS);
790
791         /* call should fill header later */
792         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
793         memset(hdr, 0, size);   /* XXX do we need this ? */
794         hdr->sadb_msg_len = size / sizeof(uint64_t);
795
796         /* sa */
797         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
798         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
799         sa->sadb_sa_exttype = SADB_EXT_SA;
800         sa->sadb_sa_spi = x->id.spi;
801         sa->sadb_sa_replay = x->props.replay_window;
802         switch (x->km.state) {
803         case XFRM_STATE_VALID:
804                 sa->sadb_sa_state = x->km.dying ?
805                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
806                 break;
807         case XFRM_STATE_ACQ:
808                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
809                 break;
810         default:
811                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
812                 break;
813         }
814         sa->sadb_sa_auth = 0;
815         if (x->aalg) {
816                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
817                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
818                                         a->desc.sadb_alg_id : 0;
819         }
820         sa->sadb_sa_encrypt = 0;
821         BUG_ON(x->ealg && x->calg);
822         if (x->ealg) {
823                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
824                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
825                                         a->desc.sadb_alg_id : 0;
826         }
827         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
828         if (x->calg) {
829                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
830                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
831                                         a->desc.sadb_alg_id : 0;
832         }
833
834         sa->sadb_sa_flags = 0;
835         if (x->props.flags & XFRM_STATE_NOECN)
836                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
837         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
838                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
839         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
840                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
841
842         /* hard time */
843         if (hsc & 2) {
844                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
845                                                              sizeof(struct sadb_lifetime));
846                 lifetime->sadb_lifetime_len =
847                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
848                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
849                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
850                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
851                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
852                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
853         }
854         /* soft time */
855         if (hsc & 1) {
856                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
857                                                              sizeof(struct sadb_lifetime));
858                 lifetime->sadb_lifetime_len =
859                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
860                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
861                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
862                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
863                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
864                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
865         }
866         /* current time */
867         lifetime = (struct sadb_lifetime *)  skb_put(skb,
868                                                      sizeof(struct sadb_lifetime));
869         lifetime->sadb_lifetime_len =
870                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
871         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
872         lifetime->sadb_lifetime_allocations = x->curlft.packets;
873         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
874         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
875         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
876         /* src address */
877         addr = (struct sadb_address*) skb_put(skb,
878                                               sizeof(struct sadb_address)+sockaddr_size);
879         addr->sadb_address_len =
880                 (sizeof(struct sadb_address)+sockaddr_size)/
881                         sizeof(uint64_t);
882         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
883         /* "if the ports are non-zero, then the sadb_address_proto field,
884            normally zero, MUST be filled in with the transport
885            protocol's number." - RFC2367 */
886         addr->sadb_address_proto = 0;
887         addr->sadb_address_reserved = 0;
888
889         addr->sadb_address_prefixlen =
890                 pfkey_sockaddr_fill(&x->props.saddr, 0,
891                                     (struct sockaddr *) (addr + 1),
892                                     x->props.family);
893         if (!addr->sadb_address_prefixlen)
894                 BUG();
895
896         /* dst address */
897         addr = (struct sadb_address*) skb_put(skb,
898                                               sizeof(struct sadb_address)+sockaddr_size);
899         addr->sadb_address_len =
900                 (sizeof(struct sadb_address)+sockaddr_size)/
901                         sizeof(uint64_t);
902         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
903         addr->sadb_address_proto = 0;
904         addr->sadb_address_reserved = 0;
905
906         addr->sadb_address_prefixlen =
907                 pfkey_sockaddr_fill(&x->id.daddr, 0,
908                                     (struct sockaddr *) (addr + 1),
909                                     x->props.family);
910         if (!addr->sadb_address_prefixlen)
911                 BUG();
912
913         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
914                              x->props.family)) {
915                 addr = (struct sadb_address*) skb_put(skb,
916                         sizeof(struct sadb_address)+sockaddr_size);
917                 addr->sadb_address_len =
918                         (sizeof(struct sadb_address)+sockaddr_size)/
919                         sizeof(uint64_t);
920                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
921                 addr->sadb_address_proto =
922                         pfkey_proto_from_xfrm(x->sel.proto);
923                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
924                 addr->sadb_address_reserved = 0;
925
926                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
927                                     (struct sockaddr *) (addr + 1),
928                                     x->props.family);
929         }
930
931         /* auth key */
932         if (add_keys && auth_key_size) {
933                 key = (struct sadb_key *) skb_put(skb,
934                                                   sizeof(struct sadb_key)+auth_key_size);
935                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
936                         sizeof(uint64_t);
937                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
938                 key->sadb_key_bits = x->aalg->alg_key_len;
939                 key->sadb_key_reserved = 0;
940                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
941         }
942         /* encrypt key */
943         if (add_keys && encrypt_key_size) {
944                 key = (struct sadb_key *) skb_put(skb,
945                                                   sizeof(struct sadb_key)+encrypt_key_size);
946                 key->sadb_key_len = (sizeof(struct sadb_key) +
947                                      encrypt_key_size) / sizeof(uint64_t);
948                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
949                 key->sadb_key_bits = x->ealg->alg_key_len;
950                 key->sadb_key_reserved = 0;
951                 memcpy(key + 1, x->ealg->alg_key,
952                        (x->ealg->alg_key_len+7)/8);
953         }
954
955         /* sa */
956         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
957         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
958         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
959         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
960                 kfree_skb(skb);
961                 return ERR_PTR(-EINVAL);
962         }
963         sa2->sadb_x_sa2_mode = mode;
964         sa2->sadb_x_sa2_reserved1 = 0;
965         sa2->sadb_x_sa2_reserved2 = 0;
966         sa2->sadb_x_sa2_sequence = 0;
967         sa2->sadb_x_sa2_reqid = x->props.reqid;
968
969         if (natt && natt->encap_type) {
970                 struct sadb_x_nat_t_type *n_type;
971                 struct sadb_x_nat_t_port *n_port;
972
973                 /* type */
974                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
975                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
976                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
977                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
978                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
979                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
980                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
981
982                 /* source port */
983                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
984                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
985                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
986                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
987                 n_port->sadb_x_nat_t_port_reserved = 0;
988
989                 /* dest port */
990                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
991                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
992                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
993                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
994                 n_port->sadb_x_nat_t_port_reserved = 0;
995         }
996
997         /* security context */
998         if (xfrm_ctx) {
999                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001                 sec_ctx->sadb_x_sec_len =
1002                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008                        xfrm_ctx->ctx_len);
1009         }
1010
1011         return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017         struct sk_buff *skb;
1018
1019         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021         return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025                                                           int hsc)
1026 {
1027         return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031                                                 const struct sadb_msg *hdr,
1032                                                 void * const *ext_hdrs)
1033 {
1034         struct xfrm_state *x;
1035         const struct sadb_lifetime *lifetime;
1036         const struct sadb_sa *sa;
1037         const struct sadb_key *key;
1038         const struct sadb_x_sec_ctx *sec_ctx;
1039         uint16_t proto;
1040         int err;
1041
1042
1043         sa = ext_hdrs[SADB_EXT_SA - 1];
1044         if (!sa ||
1045             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047                 return ERR_PTR(-EINVAL);
1048         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050                 return ERR_PTR(-EINVAL);
1051         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053                 return ERR_PTR(-EINVAL);
1054         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056                 return ERR_PTR(-EINVAL);
1057
1058         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059         if (proto == 0)
1060                 return ERR_PTR(-EINVAL);
1061
1062         /* default error is no buffer space */
1063         err = -ENOBUFS;
1064
1065         /* RFC2367:
1066
1067    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072    not true.
1073
1074            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076          */
1077         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081                 return ERR_PTR(-EINVAL);
1082         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083         if (key != NULL &&
1084             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085             ((key->sadb_key_bits+7) / 8 == 0 ||
1086              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087                 return ERR_PTR(-EINVAL);
1088         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089         if (key != NULL &&
1090             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091             ((key->sadb_key_bits+7) / 8 == 0 ||
1092              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093                 return ERR_PTR(-EINVAL);
1094
1095         x = xfrm_state_alloc(net);
1096         if (x == NULL)
1097                 return ERR_PTR(-ENOBUFS);
1098
1099         x->id.proto = proto;
1100         x->id.spi = sa->sadb_sa_spi;
1101         x->props.replay_window = sa->sadb_sa_replay;
1102         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103                 x->props.flags |= XFRM_STATE_NOECN;
1104         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110         if (lifetime != NULL) {
1111                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115         }
1116         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117         if (lifetime != NULL) {
1118                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122         }
1123
1124         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125         if (sec_ctx != NULL) {
1126                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1127
1128                 if (!uctx)
1129                         goto out;
1130
1131                 err = security_xfrm_state_alloc(x, uctx);
1132                 kfree(uctx);
1133
1134                 if (err)
1135                         goto out;
1136         }
1137
1138         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139         if (sa->sadb_sa_auth) {
1140                 int keysize = 0;
1141                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142                 if (!a || !a->pfkey_supported) {
1143                         err = -ENOSYS;
1144                         goto out;
1145                 }
1146                 if (key)
1147                         keysize = (key->sadb_key_bits + 7) / 8;
1148                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149                 if (!x->aalg)
1150                         goto out;
1151                 strcpy(x->aalg->alg_name, a->name);
1152                 x->aalg->alg_key_len = 0;
1153                 if (key) {
1154                         x->aalg->alg_key_len = key->sadb_key_bits;
1155                         memcpy(x->aalg->alg_key, key+1, keysize);
1156                 }
1157                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158                 x->props.aalgo = sa->sadb_sa_auth;
1159                 /* x->algo.flags = sa->sadb_sa_flags; */
1160         }
1161         if (sa->sadb_sa_encrypt) {
1162                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164                         if (!a || !a->pfkey_supported) {
1165                                 err = -ENOSYS;
1166                                 goto out;
1167                         }
1168                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169                         if (!x->calg)
1170                                 goto out;
1171                         strcpy(x->calg->alg_name, a->name);
1172                         x->props.calgo = sa->sadb_sa_encrypt;
1173                 } else {
1174                         int keysize = 0;
1175                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176                         if (!a || !a->pfkey_supported) {
1177                                 err = -ENOSYS;
1178                                 goto out;
1179                         }
1180                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181                         if (key)
1182                                 keysize = (key->sadb_key_bits + 7) / 8;
1183                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184                         if (!x->ealg)
1185                                 goto out;
1186                         strcpy(x->ealg->alg_name, a->name);
1187                         x->ealg->alg_key_len = 0;
1188                         if (key) {
1189                                 x->ealg->alg_key_len = key->sadb_key_bits;
1190                                 memcpy(x->ealg->alg_key, key+1, keysize);
1191                         }
1192                         x->props.ealgo = sa->sadb_sa_encrypt;
1193                 }
1194         }
1195         /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198                                                     &x->props.saddr);
1199         if (!x->props.family) {
1200                 err = -EAFNOSUPPORT;
1201                 goto out;
1202         }
1203         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1204                                   &x->id.daddr);
1205
1206         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1207                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1208                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1209                 if (mode < 0) {
1210                         err = -EINVAL;
1211                         goto out;
1212                 }
1213                 x->props.mode = mode;
1214                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1215         }
1216
1217         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1218                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1219
1220                 /* Nobody uses this, but we try. */
1221                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1222                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1223         }
1224
1225         if (!x->sel.family)
1226                 x->sel.family = x->props.family;
1227
1228         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1229                 const struct sadb_x_nat_t_type* n_type;
1230                 struct xfrm_encap_tmpl *natt;
1231
1232                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1233                 if (!x->encap)
1234                         goto out;
1235
1236                 natt = x->encap;
1237                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1238                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1239
1240                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1241                         const struct sadb_x_nat_t_port *n_port =
1242                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1243                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1244                 }
1245                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1246                         const struct sadb_x_nat_t_port *n_port =
1247                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1248                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1249                 }
1250                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1251         }
1252
1253         err = xfrm_init_state(x);
1254         if (err)
1255                 goto out;
1256
1257         x->km.seq = hdr->sadb_msg_seq;
1258         return x;
1259
1260 out:
1261         x->km.state = XFRM_STATE_DEAD;
1262         xfrm_state_put(x);
1263         return ERR_PTR(err);
1264 }
1265
1266 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1267 {
1268         return -EOPNOTSUPP;
1269 }
1270
1271 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1272 {
1273         struct net *net = sock_net(sk);
1274         struct sk_buff *resp_skb;
1275         struct sadb_x_sa2 *sa2;
1276         struct sadb_address *saddr, *daddr;
1277         struct sadb_msg *out_hdr;
1278         struct sadb_spirange *range;
1279         struct xfrm_state *x = NULL;
1280         int mode;
1281         int err;
1282         u32 min_spi, max_spi;
1283         u32 reqid;
1284         u8 proto;
1285         unsigned short family;
1286         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1287
1288         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1289                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1290                 return -EINVAL;
1291
1292         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1293         if (proto == 0)
1294                 return -EINVAL;
1295
1296         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1297                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1298                 if (mode < 0)
1299                         return -EINVAL;
1300                 reqid = sa2->sadb_x_sa2_reqid;
1301         } else {
1302                 mode = 0;
1303                 reqid = 0;
1304         }
1305
1306         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1307         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1308
1309         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1310         switch (family) {
1311         case AF_INET:
1312                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1313                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1314                 break;
1315 #if IS_ENABLED(CONFIG_IPV6)
1316         case AF_INET6:
1317                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1318                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1319                 break;
1320 #endif
1321         }
1322
1323         if (hdr->sadb_msg_seq) {
1324                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1325                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1326                         xfrm_state_put(x);
1327                         x = NULL;
1328                 }
1329         }
1330
1331         if (!x)
1332                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1333
1334         if (x == NULL)
1335                 return -ENOENT;
1336
1337         min_spi = 0x100;
1338         max_spi = 0x0fffffff;
1339
1340         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1341         if (range) {
1342                 min_spi = range->sadb_spirange_min;
1343                 max_spi = range->sadb_spirange_max;
1344         }
1345
1346         err = xfrm_alloc_spi(x, min_spi, max_spi);
1347         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1348
1349         if (IS_ERR(resp_skb)) {
1350                 xfrm_state_put(x);
1351                 return  PTR_ERR(resp_skb);
1352         }
1353
1354         out_hdr = (struct sadb_msg *) resp_skb->data;
1355         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1356         out_hdr->sadb_msg_type = SADB_GETSPI;
1357         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1358         out_hdr->sadb_msg_errno = 0;
1359         out_hdr->sadb_msg_reserved = 0;
1360         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1361         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1362
1363         xfrm_state_put(x);
1364
1365         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1366
1367         return 0;
1368 }
1369
1370 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1371 {
1372         struct net *net = sock_net(sk);
1373         struct xfrm_state *x;
1374
1375         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1376                 return -EOPNOTSUPP;
1377
1378         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1379                 return 0;
1380
1381         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1382         if (x == NULL)
1383                 return 0;
1384
1385         spin_lock_bh(&x->lock);
1386         if (x->km.state == XFRM_STATE_ACQ) {
1387                 x->km.state = XFRM_STATE_ERROR;
1388                 wake_up(&net->xfrm.km_waitq);
1389         }
1390         spin_unlock_bh(&x->lock);
1391         xfrm_state_put(x);
1392         return 0;
1393 }
1394
1395 static inline int event2poltype(int event)
1396 {
1397         switch (event) {
1398         case XFRM_MSG_DELPOLICY:
1399                 return SADB_X_SPDDELETE;
1400         case XFRM_MSG_NEWPOLICY:
1401                 return SADB_X_SPDADD;
1402         case XFRM_MSG_UPDPOLICY:
1403                 return SADB_X_SPDUPDATE;
1404         case XFRM_MSG_POLEXPIRE:
1405         //      return SADB_X_SPDEXPIRE;
1406         default:
1407                 pr_err("pfkey: Unknown policy event %d\n", event);
1408                 break;
1409         }
1410
1411         return 0;
1412 }
1413
1414 static inline int event2keytype(int event)
1415 {
1416         switch (event) {
1417         case XFRM_MSG_DELSA:
1418                 return SADB_DELETE;
1419         case XFRM_MSG_NEWSA:
1420                 return SADB_ADD;
1421         case XFRM_MSG_UPDSA:
1422                 return SADB_UPDATE;
1423         case XFRM_MSG_EXPIRE:
1424                 return SADB_EXPIRE;
1425         default:
1426                 pr_err("pfkey: Unknown SA event %d\n", event);
1427                 break;
1428         }
1429
1430         return 0;
1431 }
1432
1433 /* ADD/UPD/DEL */
1434 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1435 {
1436         struct sk_buff *skb;
1437         struct sadb_msg *hdr;
1438
1439         skb = pfkey_xfrm_state2msg(x);
1440
1441         if (IS_ERR(skb))
1442                 return PTR_ERR(skb);
1443
1444         hdr = (struct sadb_msg *) skb->data;
1445         hdr->sadb_msg_version = PF_KEY_V2;
1446         hdr->sadb_msg_type = event2keytype(c->event);
1447         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1448         hdr->sadb_msg_errno = 0;
1449         hdr->sadb_msg_reserved = 0;
1450         hdr->sadb_msg_seq = c->seq;
1451         hdr->sadb_msg_pid = c->portid;
1452
1453         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1454
1455         return 0;
1456 }
1457
1458 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1459 {
1460         struct net *net = sock_net(sk);
1461         struct xfrm_state *x;
1462         int err;
1463         struct km_event c;
1464
1465         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1466         if (IS_ERR(x))
1467                 return PTR_ERR(x);
1468
1469         xfrm_state_hold(x);
1470         if (hdr->sadb_msg_type == SADB_ADD)
1471                 err = xfrm_state_add(x);
1472         else
1473                 err = xfrm_state_update(x);
1474
1475         xfrm_audit_state_add(x, err ? 0 : 1,
1476                              audit_get_loginuid(current),
1477                              audit_get_sessionid(current), 0);
1478
1479         if (err < 0) {
1480                 x->km.state = XFRM_STATE_DEAD;
1481                 __xfrm_state_put(x);
1482                 goto out;
1483         }
1484
1485         if (hdr->sadb_msg_type == SADB_ADD)
1486                 c.event = XFRM_MSG_NEWSA;
1487         else
1488                 c.event = XFRM_MSG_UPDSA;
1489         c.seq = hdr->sadb_msg_seq;
1490         c.portid = hdr->sadb_msg_pid;
1491         km_state_notify(x, &c);
1492 out:
1493         xfrm_state_put(x);
1494         return err;
1495 }
1496
1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499         struct net *net = sock_net(sk);
1500         struct xfrm_state *x;
1501         struct km_event c;
1502         int err;
1503
1504         if (!ext_hdrs[SADB_EXT_SA-1] ||
1505             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1506                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1507                 return -EINVAL;
1508
1509         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1510         if (x == NULL)
1511                 return -ESRCH;
1512
1513         if ((err = security_xfrm_state_delete(x)))
1514                 goto out;
1515
1516         if (xfrm_state_kern(x)) {
1517                 err = -EPERM;
1518                 goto out;
1519         }
1520
1521         err = xfrm_state_delete(x);
1522
1523         if (err < 0)
1524                 goto out;
1525
1526         c.seq = hdr->sadb_msg_seq;
1527         c.portid = hdr->sadb_msg_pid;
1528         c.event = XFRM_MSG_DELSA;
1529         km_state_notify(x, &c);
1530 out:
1531         xfrm_audit_state_delete(x, err ? 0 : 1,
1532                                 audit_get_loginuid(current),
1533                                 audit_get_sessionid(current), 0);
1534         xfrm_state_put(x);
1535
1536         return err;
1537 }
1538
1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1540 {
1541         struct net *net = sock_net(sk);
1542         __u8 proto;
1543         struct sk_buff *out_skb;
1544         struct sadb_msg *out_hdr;
1545         struct xfrm_state *x;
1546
1547         if (!ext_hdrs[SADB_EXT_SA-1] ||
1548             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550                 return -EINVAL;
1551
1552         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553         if (x == NULL)
1554                 return -ESRCH;
1555
1556         out_skb = pfkey_xfrm_state2msg(x);
1557         proto = x->id.proto;
1558         xfrm_state_put(x);
1559         if (IS_ERR(out_skb))
1560                 return  PTR_ERR(out_skb);
1561
1562         out_hdr = (struct sadb_msg *) out_skb->data;
1563         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1564         out_hdr->sadb_msg_type = SADB_GET;
1565         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1566         out_hdr->sadb_msg_errno = 0;
1567         out_hdr->sadb_msg_reserved = 0;
1568         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1569         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1570         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1571
1572         return 0;
1573 }
1574
1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1576                                               gfp_t allocation)
1577 {
1578         struct sk_buff *skb;
1579         struct sadb_msg *hdr;
1580         int len, auth_len, enc_len, i;
1581
1582         auth_len = xfrm_count_pfkey_auth_supported();
1583         if (auth_len) {
1584                 auth_len *= sizeof(struct sadb_alg);
1585                 auth_len += sizeof(struct sadb_supported);
1586         }
1587
1588         enc_len = xfrm_count_pfkey_enc_supported();
1589         if (enc_len) {
1590                 enc_len *= sizeof(struct sadb_alg);
1591                 enc_len += sizeof(struct sadb_supported);
1592         }
1593
1594         len = enc_len + auth_len + sizeof(struct sadb_msg);
1595
1596         skb = alloc_skb(len + 16, allocation);
1597         if (!skb)
1598                 goto out_put_algs;
1599
1600         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1601         pfkey_hdr_dup(hdr, orig);
1602         hdr->sadb_msg_errno = 0;
1603         hdr->sadb_msg_len = len / sizeof(uint64_t);
1604
1605         if (auth_len) {
1606                 struct sadb_supported *sp;
1607                 struct sadb_alg *ap;
1608
1609                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1610                 ap = (struct sadb_alg *) (sp + 1);
1611
1612                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1613                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1614
1615                 for (i = 0; ; i++) {
1616                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1617                         if (!aalg)
1618                                 break;
1619                         if (!aalg->pfkey_supported)
1620                                 continue;
1621                         if (aalg->available)
1622                                 *ap++ = aalg->desc;
1623                 }
1624         }
1625
1626         if (enc_len) {
1627                 struct sadb_supported *sp;
1628                 struct sadb_alg *ap;
1629
1630                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1631                 ap = (struct sadb_alg *) (sp + 1);
1632
1633                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1634                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1635
1636                 for (i = 0; ; i++) {
1637                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1638                         if (!ealg)
1639                                 break;
1640                         if (!ealg->pfkey_supported)
1641                                 continue;
1642                         if (ealg->available)
1643                                 *ap++ = ealg->desc;
1644                 }
1645         }
1646
1647 out_put_algs:
1648         return skb;
1649 }
1650
1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1652 {
1653         struct pfkey_sock *pfk = pfkey_sk(sk);
1654         struct sk_buff *supp_skb;
1655
1656         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1657                 return -EINVAL;
1658
1659         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1660                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1661                         return -EEXIST;
1662                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1663         }
1664
1665         xfrm_probe_algs();
1666
1667         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1668         if (!supp_skb) {
1669                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1670                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1671
1672                 return -ENOBUFS;
1673         }
1674
1675         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1676
1677         return 0;
1678 }
1679
1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 {
1682         struct sk_buff *skb;
1683         struct sadb_msg *hdr;
1684
1685         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1686         if (!skb)
1687                 return -ENOBUFS;
1688
1689         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1690         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1691         hdr->sadb_msg_errno = (uint8_t) 0;
1692         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1693
1694         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1695 }
1696
1697 static int key_notify_sa_flush(const struct km_event *c)
1698 {
1699         struct sk_buff *skb;
1700         struct sadb_msg *hdr;
1701
1702         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1703         if (!skb)
1704                 return -ENOBUFS;
1705         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1706         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1707         hdr->sadb_msg_type = SADB_FLUSH;
1708         hdr->sadb_msg_seq = c->seq;
1709         hdr->sadb_msg_pid = c->portid;
1710         hdr->sadb_msg_version = PF_KEY_V2;
1711         hdr->sadb_msg_errno = (uint8_t) 0;
1712         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713
1714         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1715
1716         return 0;
1717 }
1718
1719 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1720 {
1721         struct net *net = sock_net(sk);
1722         unsigned int proto;
1723         struct km_event c;
1724         struct xfrm_audit audit_info;
1725         int err, err2;
1726
1727         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1728         if (proto == 0)
1729                 return -EINVAL;
1730
1731         audit_info.loginuid = audit_get_loginuid(current);
1732         audit_info.sessionid = audit_get_sessionid(current);
1733         audit_info.secid = 0;
1734         err = xfrm_state_flush(net, proto, &audit_info);
1735         err2 = unicast_flush_resp(sk, hdr);
1736         if (err || err2) {
1737                 if (err == -ESRCH) /* empty table - go quietly */
1738                         err = 0;
1739                 return err ? err : err2;
1740         }
1741
1742         c.data.proto = proto;
1743         c.seq = hdr->sadb_msg_seq;
1744         c.portid = hdr->sadb_msg_pid;
1745         c.event = XFRM_MSG_FLUSHSA;
1746         c.net = net;
1747         km_state_notify(NULL, &c);
1748
1749         return 0;
1750 }
1751
1752 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1753 {
1754         struct pfkey_sock *pfk = ptr;
1755         struct sk_buff *out_skb;
1756         struct sadb_msg *out_hdr;
1757
1758         if (!pfkey_can_dump(&pfk->sk))
1759                 return -ENOBUFS;
1760
1761         out_skb = pfkey_xfrm_state2msg(x);
1762         if (IS_ERR(out_skb))
1763                 return PTR_ERR(out_skb);
1764
1765         out_hdr = (struct sadb_msg *) out_skb->data;
1766         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1767         out_hdr->sadb_msg_type = SADB_DUMP;
1768         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1769         out_hdr->sadb_msg_errno = 0;
1770         out_hdr->sadb_msg_reserved = 0;
1771         out_hdr->sadb_msg_seq = count + 1;
1772         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1773
1774         if (pfk->dump.skb)
1775                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1776                                 &pfk->sk, sock_net(&pfk->sk));
1777         pfk->dump.skb = out_skb;
1778
1779         return 0;
1780 }
1781
1782 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1783 {
1784         struct net *net = sock_net(&pfk->sk);
1785         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1786 }
1787
1788 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1789 {
1790         xfrm_state_walk_done(&pfk->dump.u.state);
1791 }
1792
1793 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1794 {
1795         u8 proto;
1796         struct pfkey_sock *pfk = pfkey_sk(sk);
1797
1798         if (pfk->dump.dump != NULL)
1799                 return -EBUSY;
1800
1801         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1802         if (proto == 0)
1803                 return -EINVAL;
1804
1805         pfk->dump.msg_version = hdr->sadb_msg_version;
1806         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1807         pfk->dump.dump = pfkey_dump_sa;
1808         pfk->dump.done = pfkey_dump_sa_done;
1809         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1810
1811         return pfkey_do_dump(pfk);
1812 }
1813
1814 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1815 {
1816         struct pfkey_sock *pfk = pfkey_sk(sk);
1817         int satype = hdr->sadb_msg_satype;
1818         bool reset_errno = false;
1819
1820         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1821                 reset_errno = true;
1822                 if (satype != 0 && satype != 1)
1823                         return -EINVAL;
1824                 pfk->promisc = satype;
1825         }
1826         if (reset_errno && skb_cloned(skb))
1827                 skb = skb_copy(skb, GFP_KERNEL);
1828         else
1829                 skb = skb_clone(skb, GFP_KERNEL);
1830
1831         if (reset_errno && skb) {
1832                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1833                 new_hdr->sadb_msg_errno = 0;
1834         }
1835
1836         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1837         return 0;
1838 }
1839
1840 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1841 {
1842         int i;
1843         u32 reqid = *(u32*)ptr;
1844
1845         for (i=0; i<xp->xfrm_nr; i++) {
1846                 if (xp->xfrm_vec[i].reqid == reqid)
1847                         return -EEXIST;
1848         }
1849         return 0;
1850 }
1851
1852 static u32 gen_reqid(struct net *net)
1853 {
1854         struct xfrm_policy_walk walk;
1855         u32 start;
1856         int rc;
1857         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1858
1859         start = reqid;
1860         do {
1861                 ++reqid;
1862                 if (reqid == 0)
1863                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1864                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1865                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1866                 xfrm_policy_walk_done(&walk);
1867                 if (rc != -EEXIST)
1868                         return reqid;
1869         } while (reqid != start);
1870         return 0;
1871 }
1872
1873 static int
1874 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1875 {
1876         struct net *net = xp_net(xp);
1877         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1878         int mode;
1879
1880         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1881                 return -ELOOP;
1882
1883         if (rq->sadb_x_ipsecrequest_mode == 0)
1884                 return -EINVAL;
1885
1886         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1887         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1888                 return -EINVAL;
1889         t->mode = mode;
1890         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1891                 t->optional = 1;
1892         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1893                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1894                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1895                         t->reqid = 0;
1896                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1897                         return -ENOBUFS;
1898         }
1899
1900         /* addresses present only in tunnel mode */
1901         if (t->mode == XFRM_MODE_TUNNEL) {
1902                 u8 *sa = (u8 *) (rq + 1);
1903                 int family, socklen;
1904
1905                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1906                                                 &t->saddr);
1907                 if (!family)
1908                         return -EINVAL;
1909
1910                 socklen = pfkey_sockaddr_len(family);
1911                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1912                                            &t->id.daddr) != family)
1913                         return -EINVAL;
1914                 t->encap_family = family;
1915         } else
1916                 t->encap_family = xp->family;
1917
1918         /* No way to set this via kame pfkey */
1919         t->allalgs = 1;
1920         xp->xfrm_nr++;
1921         return 0;
1922 }
1923
1924 static int
1925 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1926 {
1927         int err;
1928         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1929         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1930
1931         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1932                 return -EINVAL;
1933
1934         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1935                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1936                         return err;
1937                 len -= rq->sadb_x_ipsecrequest_len;
1938                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1939         }
1940         return 0;
1941 }
1942
1943 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1944 {
1945   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1946
1947         if (xfrm_ctx) {
1948                 int len = sizeof(struct sadb_x_sec_ctx);
1949                 len += xfrm_ctx->ctx_len;
1950                 return PFKEY_ALIGN8(len);
1951         }
1952         return 0;
1953 }
1954
1955 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1956 {
1957         const struct xfrm_tmpl *t;
1958         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1959         int socklen = 0;
1960         int i;
1961
1962         for (i=0; i<xp->xfrm_nr; i++) {
1963                 t = xp->xfrm_vec + i;
1964                 socklen += pfkey_sockaddr_len(t->encap_family);
1965         }
1966
1967         return sizeof(struct sadb_msg) +
1968                 (sizeof(struct sadb_lifetime) * 3) +
1969                 (sizeof(struct sadb_address) * 2) +
1970                 (sockaddr_size * 2) +
1971                 sizeof(struct sadb_x_policy) +
1972                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1973                 (socklen * 2) +
1974                 pfkey_xfrm_policy2sec_ctx_size(xp);
1975 }
1976
1977 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1978 {
1979         struct sk_buff *skb;
1980         int size;
1981
1982         size = pfkey_xfrm_policy2msg_size(xp);
1983
1984         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1985         if (skb == NULL)
1986                 return ERR_PTR(-ENOBUFS);
1987
1988         return skb;
1989 }
1990
1991 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1992 {
1993         struct sadb_msg *hdr;
1994         struct sadb_address *addr;
1995         struct sadb_lifetime *lifetime;
1996         struct sadb_x_policy *pol;
1997         struct sadb_x_sec_ctx *sec_ctx;
1998         struct xfrm_sec_ctx *xfrm_ctx;
1999         int i;
2000         int size;
2001         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2002         int socklen = pfkey_sockaddr_len(xp->family);
2003
2004         size = pfkey_xfrm_policy2msg_size(xp);
2005
2006         /* call should fill header later */
2007         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2008         memset(hdr, 0, size);   /* XXX do we need this ? */
2009
2010         /* src address */
2011         addr = (struct sadb_address*) skb_put(skb,
2012                                               sizeof(struct sadb_address)+sockaddr_size);
2013         addr->sadb_address_len =
2014                 (sizeof(struct sadb_address)+sockaddr_size)/
2015                         sizeof(uint64_t);
2016         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2017         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2018         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2019         addr->sadb_address_reserved = 0;
2020         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2021                                  xp->selector.sport,
2022                                  (struct sockaddr *) (addr + 1),
2023                                  xp->family))
2024                 BUG();
2025
2026         /* dst address */
2027         addr = (struct sadb_address*) skb_put(skb,
2028                                               sizeof(struct sadb_address)+sockaddr_size);
2029         addr->sadb_address_len =
2030                 (sizeof(struct sadb_address)+sockaddr_size)/
2031                         sizeof(uint64_t);
2032         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2033         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2034         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2035         addr->sadb_address_reserved = 0;
2036
2037         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2038                             (struct sockaddr *) (addr + 1),
2039                             xp->family);
2040
2041         /* hard time */
2042         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2043                                                      sizeof(struct sadb_lifetime));
2044         lifetime->sadb_lifetime_len =
2045                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2046         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2047         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2048         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2049         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2050         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2051         /* soft time */
2052         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2053                                                      sizeof(struct sadb_lifetime));
2054         lifetime->sadb_lifetime_len =
2055                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2056         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2057         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2058         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2059         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2060         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2061         /* current time */
2062         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2063                                                      sizeof(struct sadb_lifetime));
2064         lifetime->sadb_lifetime_len =
2065                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2066         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2067         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2068         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2069         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2070         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2071
2072         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2073         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2074         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2075         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2076         if (xp->action == XFRM_POLICY_ALLOW) {
2077                 if (xp->xfrm_nr)
2078                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2079                 else
2080                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2081         }
2082         pol->sadb_x_policy_dir = dir+1;
2083         pol->sadb_x_policy_id = xp->index;
2084         pol->sadb_x_policy_priority = xp->priority;
2085
2086         for (i=0; i<xp->xfrm_nr; i++) {
2087                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2088                 struct sadb_x_ipsecrequest *rq;
2089                 int req_size;
2090                 int mode;
2091
2092                 req_size = sizeof(struct sadb_x_ipsecrequest);
2093                 if (t->mode == XFRM_MODE_TUNNEL) {
2094                         socklen = pfkey_sockaddr_len(t->encap_family);
2095                         req_size += socklen * 2;
2096                 } else {
2097                         size -= 2*socklen;
2098                 }
2099                 rq = (void*)skb_put(skb, req_size);
2100                 pol->sadb_x_policy_len += req_size/8;
2101                 memset(rq, 0, sizeof(*rq));
2102                 rq->sadb_x_ipsecrequest_len = req_size;
2103                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2104                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2105                         return -EINVAL;
2106                 rq->sadb_x_ipsecrequest_mode = mode;
2107                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2108                 if (t->reqid)
2109                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2110                 if (t->optional)
2111                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2112                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2113
2114                 if (t->mode == XFRM_MODE_TUNNEL) {
2115                         u8 *sa = (void *)(rq + 1);
2116                         pfkey_sockaddr_fill(&t->saddr, 0,
2117                                             (struct sockaddr *)sa,
2118                                             t->encap_family);
2119                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2120                                             (struct sockaddr *) (sa + socklen),
2121                                             t->encap_family);
2122                 }
2123         }
2124
2125         /* security context */
2126         if ((xfrm_ctx = xp->security)) {
2127                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2128
2129                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2130                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2131                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2132                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2133                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2134                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2135                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2136                        xfrm_ctx->ctx_len);
2137         }
2138
2139         hdr->sadb_msg_len = size / sizeof(uint64_t);
2140         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2141
2142         return 0;
2143 }
2144
2145 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2146 {
2147         struct sk_buff *out_skb;
2148         struct sadb_msg *out_hdr;
2149         int err;
2150
2151         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2152         if (IS_ERR(out_skb))
2153                 return PTR_ERR(out_skb);
2154
2155         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2156         if (err < 0)
2157                 return err;
2158
2159         out_hdr = (struct sadb_msg *) out_skb->data;
2160         out_hdr->sadb_msg_version = PF_KEY_V2;
2161
2162         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2163                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2164         else
2165                 out_hdr->sadb_msg_type = event2poltype(c->event);
2166         out_hdr->sadb_msg_errno = 0;
2167         out_hdr->sadb_msg_seq = c->seq;
2168         out_hdr->sadb_msg_pid = c->portid;
2169         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2170         return 0;
2171
2172 }
2173
2174 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2175 {
2176         struct net *net = sock_net(sk);
2177         int err = 0;
2178         struct sadb_lifetime *lifetime;
2179         struct sadb_address *sa;
2180         struct sadb_x_policy *pol;
2181         struct xfrm_policy *xp;
2182         struct km_event c;
2183         struct sadb_x_sec_ctx *sec_ctx;
2184
2185         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2186                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2187             !ext_hdrs[SADB_X_EXT_POLICY-1])
2188                 return -EINVAL;
2189
2190         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2191         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2192                 return -EINVAL;
2193         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2194                 return -EINVAL;
2195
2196         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2197         if (xp == NULL)
2198                 return -ENOBUFS;
2199
2200         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2201                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2202         xp->priority = pol->sadb_x_policy_priority;
2203
2204         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2205         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2206         if (!xp->family) {
2207                 err = -EINVAL;
2208                 goto out;
2209         }
2210         xp->selector.family = xp->family;
2211         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2212         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2213         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2214         if (xp->selector.sport)
2215                 xp->selector.sport_mask = htons(0xffff);
2216
2217         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2218         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2219         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2220
2221         /* Amusing, we set this twice.  KAME apps appear to set same value
2222          * in both addresses.
2223          */
2224         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2225
2226         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2227         if (xp->selector.dport)
2228                 xp->selector.dport_mask = htons(0xffff);
2229
2230         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2231         if (sec_ctx != NULL) {
2232                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2233
2234                 if (!uctx) {
2235                         err = -ENOBUFS;
2236                         goto out;
2237                 }
2238
2239                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2240                 kfree(uctx);
2241
2242                 if (err)
2243                         goto out;
2244         }
2245
2246         xp->lft.soft_byte_limit = XFRM_INF;
2247         xp->lft.hard_byte_limit = XFRM_INF;
2248         xp->lft.soft_packet_limit = XFRM_INF;
2249         xp->lft.hard_packet_limit = XFRM_INF;
2250         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2251                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2252                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2253                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2254                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2255         }
2256         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2257                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2258                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2259                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2260                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2261         }
2262         xp->xfrm_nr = 0;
2263         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2264             (err = parse_ipsecrequests(xp, pol)) < 0)
2265                 goto out;
2266
2267         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2268                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2269
2270         xfrm_audit_policy_add(xp, err ? 0 : 1,
2271                               audit_get_loginuid(current),
2272                               audit_get_sessionid(current), 0);
2273
2274         if (err)
2275                 goto out;
2276
2277         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2278                 c.event = XFRM_MSG_UPDPOLICY;
2279         else
2280                 c.event = XFRM_MSG_NEWPOLICY;
2281
2282         c.seq = hdr->sadb_msg_seq;
2283         c.portid = hdr->sadb_msg_pid;
2284
2285         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2286         xfrm_pol_put(xp);
2287         return 0;
2288
2289 out:
2290         xp->walk.dead = 1;
2291         xfrm_policy_destroy(xp);
2292         return err;
2293 }
2294
2295 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2296 {
2297         struct net *net = sock_net(sk);
2298         int err;
2299         struct sadb_address *sa;
2300         struct sadb_x_policy *pol;
2301         struct xfrm_policy *xp;
2302         struct xfrm_selector sel;
2303         struct km_event c;
2304         struct sadb_x_sec_ctx *sec_ctx;
2305         struct xfrm_sec_ctx *pol_ctx = NULL;
2306
2307         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2308                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2309             !ext_hdrs[SADB_X_EXT_POLICY-1])
2310                 return -EINVAL;
2311
2312         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2313         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2314                 return -EINVAL;
2315
2316         memset(&sel, 0, sizeof(sel));
2317
2318         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2319         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2320         sel.prefixlen_s = sa->sadb_address_prefixlen;
2321         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2322         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2323         if (sel.sport)
2324                 sel.sport_mask = htons(0xffff);
2325
2326         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2327         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2328         sel.prefixlen_d = sa->sadb_address_prefixlen;
2329         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2330         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2331         if (sel.dport)
2332                 sel.dport_mask = htons(0xffff);
2333
2334         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2335         if (sec_ctx != NULL) {
2336                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2337
2338                 if (!uctx)
2339                         return -ENOMEM;
2340
2341                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2342                 kfree(uctx);
2343                 if (err)
2344                         return err;
2345         }
2346
2347         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2348                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2349                                    1, &err);
2350         security_xfrm_policy_free(pol_ctx);
2351         if (xp == NULL)
2352                 return -ENOENT;
2353
2354         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2355                                  audit_get_loginuid(current),
2356                                  audit_get_sessionid(current), 0);
2357
2358         if (err)
2359                 goto out;
2360
2361         c.seq = hdr->sadb_msg_seq;
2362         c.portid = hdr->sadb_msg_pid;
2363         c.data.byid = 0;
2364         c.event = XFRM_MSG_DELPOLICY;
2365         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2366
2367 out:
2368         xfrm_pol_put(xp);
2369         return err;
2370 }
2371
2372 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2373 {
2374         int err;
2375         struct sk_buff *out_skb;
2376         struct sadb_msg *out_hdr;
2377         err = 0;
2378
2379         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2380         if (IS_ERR(out_skb)) {
2381                 err =  PTR_ERR(out_skb);
2382                 goto out;
2383         }
2384         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2385         if (err < 0)
2386                 goto out;
2387
2388         out_hdr = (struct sadb_msg *) out_skb->data;
2389         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2390         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2391         out_hdr->sadb_msg_satype = 0;
2392         out_hdr->sadb_msg_errno = 0;
2393         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2394         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2395         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2396         err = 0;
2397
2398 out:
2399         return err;
2400 }
2401
2402 #ifdef CONFIG_NET_KEY_MIGRATE
2403 static int pfkey_sockaddr_pair_size(sa_family_t family)
2404 {
2405         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2406 }
2407
2408 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2409                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2410                                u16 *family)
2411 {
2412         int af, socklen;
2413
2414         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2415                 return -EINVAL;
2416
2417         af = pfkey_sockaddr_extract(sa, saddr);
2418         if (!af)
2419                 return -EINVAL;
2420
2421         socklen = pfkey_sockaddr_len(af);
2422         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2423                                    daddr) != af)
2424                 return -EINVAL;
2425
2426         *family = af;
2427         return 0;
2428 }
2429
2430 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2431                                     struct xfrm_migrate *m)
2432 {
2433         int err;
2434         struct sadb_x_ipsecrequest *rq2;
2435         int mode;
2436
2437         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2438             len < rq1->sadb_x_ipsecrequest_len)
2439                 return -EINVAL;
2440
2441         /* old endoints */
2442         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2443                                   rq1->sadb_x_ipsecrequest_len,
2444                                   &m->old_saddr, &m->old_daddr,
2445                                   &m->old_family);
2446         if (err)
2447                 return err;
2448
2449         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2450         len -= rq1->sadb_x_ipsecrequest_len;
2451
2452         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2453             len < rq2->sadb_x_ipsecrequest_len)
2454                 return -EINVAL;
2455
2456         /* new endpoints */
2457         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2458                                   rq2->sadb_x_ipsecrequest_len,
2459                                   &m->new_saddr, &m->new_daddr,
2460                                   &m->new_family);
2461         if (err)
2462                 return err;
2463
2464         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2465             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2466             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2467                 return -EINVAL;
2468
2469         m->proto = rq1->sadb_x_ipsecrequest_proto;
2470         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2471                 return -EINVAL;
2472         m->mode = mode;
2473         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2474
2475         return ((int)(rq1->sadb_x_ipsecrequest_len +
2476                       rq2->sadb_x_ipsecrequest_len));
2477 }
2478
2479 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2480                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2481 {
2482         int i, len, ret, err = -EINVAL;
2483         u8 dir;
2484         struct sadb_address *sa;
2485         struct sadb_x_kmaddress *kma;
2486         struct sadb_x_policy *pol;
2487         struct sadb_x_ipsecrequest *rq;
2488         struct xfrm_selector sel;
2489         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2490         struct xfrm_kmaddress k;
2491
2492         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2493                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2494             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2495                 err = -EINVAL;
2496                 goto out;
2497         }
2498
2499         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2500         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2501
2502         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2503                 err = -EINVAL;
2504                 goto out;
2505         }
2506
2507         if (kma) {
2508                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2509                 k.reserved = kma->sadb_x_kmaddress_reserved;
2510                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2511                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2512                                           &k.local, &k.remote, &k.family);
2513                 if (ret < 0) {
2514                         err = ret;
2515                         goto out;
2516                 }
2517         }
2518
2519         dir = pol->sadb_x_policy_dir - 1;
2520         memset(&sel, 0, sizeof(sel));
2521
2522         /* set source address info of selector */
2523         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2524         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2525         sel.prefixlen_s = sa->sadb_address_prefixlen;
2526         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2527         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2528         if (sel.sport)
2529                 sel.sport_mask = htons(0xffff);
2530
2531         /* set destination address info of selector */
2532         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2533         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2534         sel.prefixlen_d = sa->sadb_address_prefixlen;
2535         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2536         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2537         if (sel.dport)
2538                 sel.dport_mask = htons(0xffff);
2539
2540         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2541
2542         /* extract ipsecrequests */
2543         i = 0;
2544         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2545
2546         while (len > 0 && i < XFRM_MAX_DEPTH) {
2547                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2548                 if (ret < 0) {
2549                         err = ret;
2550                         goto out;
2551                 } else {
2552                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2553                         len -= ret;
2554                         i++;
2555                 }
2556         }
2557
2558         if (!i || len > 0) {
2559                 err = -EINVAL;
2560                 goto out;
2561         }
2562
2563         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2564                             kma ? &k : NULL);
2565
2566  out:
2567         return err;
2568 }
2569 #else
2570 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2571                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2572 {
2573         return -ENOPROTOOPT;
2574 }
2575 #endif
2576
2577
2578 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2579 {
2580         struct net *net = sock_net(sk);
2581         unsigned int dir;
2582         int err = 0, delete;
2583         struct sadb_x_policy *pol;
2584         struct xfrm_policy *xp;
2585         struct km_event c;
2586
2587         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2588                 return -EINVAL;
2589
2590         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2591         if (dir >= XFRM_POLICY_MAX)
2592                 return -EINVAL;
2593
2594         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2595         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2596                               dir, pol->sadb_x_policy_id, delete, &err);
2597         if (xp == NULL)
2598                 return -ENOENT;
2599
2600         if (delete) {
2601                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2602                                 audit_get_loginuid(current),
2603                                 audit_get_sessionid(current), 0);
2604
2605                 if (err)
2606                         goto out;
2607                 c.seq = hdr->sadb_msg_seq;
2608                 c.portid = hdr->sadb_msg_pid;
2609                 c.data.byid = 1;
2610                 c.event = XFRM_MSG_DELPOLICY;
2611                 km_policy_notify(xp, dir, &c);
2612         } else {
2613                 err = key_pol_get_resp(sk, xp, hdr, dir);
2614         }
2615
2616 out:
2617         xfrm_pol_put(xp);
2618         return err;
2619 }
2620
2621 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2622 {
2623         struct pfkey_sock *pfk = ptr;
2624         struct sk_buff *out_skb;
2625         struct sadb_msg *out_hdr;
2626         int err;
2627
2628         if (!pfkey_can_dump(&pfk->sk))
2629                 return -ENOBUFS;
2630
2631         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2632         if (IS_ERR(out_skb))
2633                 return PTR_ERR(out_skb);
2634
2635         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2636         if (err < 0)
2637                 return err;
2638
2639         out_hdr = (struct sadb_msg *) out_skb->data;
2640         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2641         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2642         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2643         out_hdr->sadb_msg_errno = 0;
2644         out_hdr->sadb_msg_seq = count + 1;
2645         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2646
2647         if (pfk->dump.skb)
2648                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2649                                 &pfk->sk, sock_net(&pfk->sk));
2650         pfk->dump.skb = out_skb;
2651
2652         return 0;
2653 }
2654
2655 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2656 {
2657         struct net *net = sock_net(&pfk->sk);
2658         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2659 }
2660
2661 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2662 {
2663         xfrm_policy_walk_done(&pfk->dump.u.policy);
2664 }
2665
2666 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2667 {
2668         struct pfkey_sock *pfk = pfkey_sk(sk);
2669
2670         if (pfk->dump.dump != NULL)
2671                 return -EBUSY;
2672
2673         pfk->dump.msg_version = hdr->sadb_msg_version;
2674         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2675         pfk->dump.dump = pfkey_dump_sp;
2676         pfk->dump.done = pfkey_dump_sp_done;
2677         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2678
2679         return pfkey_do_dump(pfk);
2680 }
2681
2682 static int key_notify_policy_flush(const struct km_event *c)
2683 {
2684         struct sk_buff *skb_out;
2685         struct sadb_msg *hdr;
2686
2687         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2688         if (!skb_out)
2689                 return -ENOBUFS;
2690         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2691         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2692         hdr->sadb_msg_seq = c->seq;
2693         hdr->sadb_msg_pid = c->portid;
2694         hdr->sadb_msg_version = PF_KEY_V2;
2695         hdr->sadb_msg_errno = (uint8_t) 0;
2696         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2697         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2698         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2699         return 0;
2700
2701 }
2702
2703 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2704 {
2705         struct net *net = sock_net(sk);
2706         struct km_event c;
2707         struct xfrm_audit audit_info;
2708         int err, err2;
2709
2710         audit_info.loginuid = audit_get_loginuid(current);
2711         audit_info.sessionid = audit_get_sessionid(current);
2712         audit_info.secid = 0;
2713         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2714         err2 = unicast_flush_resp(sk, hdr);
2715         if (err || err2) {
2716                 if (err == -ESRCH) /* empty table - old silent behavior */
2717                         return 0;
2718                 return err;
2719         }
2720
2721         c.data.type = XFRM_POLICY_TYPE_MAIN;
2722         c.event = XFRM_MSG_FLUSHPOLICY;
2723         c.portid = hdr->sadb_msg_pid;
2724         c.seq = hdr->sadb_msg_seq;
2725         c.net = net;
2726         km_policy_notify(NULL, 0, &c);
2727
2728         return 0;
2729 }
2730
2731 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2732                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2733 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2734         [SADB_RESERVED]         = pfkey_reserved,
2735         [SADB_GETSPI]           = pfkey_getspi,
2736         [SADB_UPDATE]           = pfkey_add,
2737         [SADB_ADD]              = pfkey_add,
2738         [SADB_DELETE]           = pfkey_delete,
2739         [SADB_GET]              = pfkey_get,
2740         [SADB_ACQUIRE]          = pfkey_acquire,
2741         [SADB_REGISTER]         = pfkey_register,
2742         [SADB_EXPIRE]           = NULL,
2743         [SADB_FLUSH]            = pfkey_flush,
2744         [SADB_DUMP]             = pfkey_dump,
2745         [SADB_X_PROMISC]        = pfkey_promisc,
2746         [SADB_X_PCHANGE]        = NULL,
2747         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2748         [SADB_X_SPDADD]         = pfkey_spdadd,
2749         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2750         [SADB_X_SPDGET]         = pfkey_spdget,
2751         [SADB_X_SPDACQUIRE]     = NULL,
2752         [SADB_X_SPDDUMP]        = pfkey_spddump,
2753         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2754         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2755         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2756         [SADB_X_MIGRATE]        = pfkey_migrate,
2757 };
2758
2759 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2760 {
2761         void *ext_hdrs[SADB_EXT_MAX];
2762         int err;
2763
2764         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2765                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2766
2767         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2768         err = parse_exthdrs(skb, hdr, ext_hdrs);
2769         if (!err) {
2770                 err = -EOPNOTSUPP;
2771                 if (pfkey_funcs[hdr->sadb_msg_type])
2772                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2773         }
2774         return err;
2775 }
2776
2777 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2778 {
2779         struct sadb_msg *hdr = NULL;
2780
2781         if (skb->len < sizeof(*hdr)) {
2782                 *errp = -EMSGSIZE;
2783         } else {
2784                 hdr = (struct sadb_msg *) skb->data;
2785                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2786                     hdr->sadb_msg_reserved != 0 ||
2787                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2788                      hdr->sadb_msg_type > SADB_MAX)) {
2789                         hdr = NULL;
2790                         *errp = -EINVAL;
2791                 } else if (hdr->sadb_msg_len != (skb->len /
2792                                                  sizeof(uint64_t)) ||
2793                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2794                                                 sizeof(uint64_t))) {
2795                         hdr = NULL;
2796                         *errp = -EMSGSIZE;
2797                 } else {
2798                         *errp = 0;
2799                 }
2800         }
2801         return hdr;
2802 }
2803
2804 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2805                                 const struct xfrm_algo_desc *d)
2806 {
2807         unsigned int id = d->desc.sadb_alg_id;
2808
2809         if (id >= sizeof(t->aalgos) * 8)
2810                 return 0;
2811
2812         return (t->aalgos >> id) & 1;
2813 }
2814
2815 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2816                                 const struct xfrm_algo_desc *d)
2817 {
2818         unsigned int id = d->desc.sadb_alg_id;
2819
2820         if (id >= sizeof(t->ealgos) * 8)
2821                 return 0;
2822
2823         return (t->ealgos >> id) & 1;
2824 }
2825
2826 static int count_ah_combs(const struct xfrm_tmpl *t)
2827 {
2828         int i, sz = 0;
2829
2830         for (i = 0; ; i++) {
2831                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2832                 if (!aalg)
2833                         break;
2834                 if (!aalg->pfkey_supported)
2835                         continue;
2836                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2837                         sz += sizeof(struct sadb_comb);
2838         }
2839         return sz + sizeof(struct sadb_prop);
2840 }
2841
2842 static int count_esp_combs(const struct xfrm_tmpl *t)
2843 {
2844         int i, k, sz = 0;
2845
2846         for (i = 0; ; i++) {
2847                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2848                 if (!ealg)
2849                         break;
2850
2851                 if (!ealg->pfkey_supported)
2852                         continue;
2853
2854                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2855                         continue;
2856
2857                 for (k = 1; ; k++) {
2858                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2859                         if (!aalg)
2860                                 break;
2861
2862                         if (!aalg->pfkey_supported)
2863                                 continue;
2864
2865                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2866                                 sz += sizeof(struct sadb_comb);
2867                 }
2868         }
2869         return sz + sizeof(struct sadb_prop);
2870 }
2871
2872 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2873 {
2874         struct sadb_prop *p;
2875         int i;
2876
2877         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2878         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2879         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2880         p->sadb_prop_replay = 32;
2881         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2882
2883         for (i = 0; ; i++) {
2884                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2885                 if (!aalg)
2886                         break;
2887
2888                 if (!aalg->pfkey_supported)
2889                         continue;
2890
2891                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2892                         struct sadb_comb *c;
2893                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2894                         memset(c, 0, sizeof(*c));
2895                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2896                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2897                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2898                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2899                         c->sadb_comb_hard_addtime = 24*60*60;
2900                         c->sadb_comb_soft_addtime = 20*60*60;
2901                         c->sadb_comb_hard_usetime = 8*60*60;
2902                         c->sadb_comb_soft_usetime = 7*60*60;
2903                 }
2904         }
2905 }
2906
2907 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2908 {
2909         struct sadb_prop *p;
2910         int i, k;
2911
2912         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2913         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2914         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2915         p->sadb_prop_replay = 32;
2916         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2917
2918         for (i=0; ; i++) {
2919                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920                 if (!ealg)
2921                         break;
2922
2923                 if (!ealg->pfkey_supported)
2924                         continue;
2925
2926                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927                         continue;
2928
2929                 for (k = 1; ; k++) {
2930                         struct sadb_comb *c;
2931                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2932                         if (!aalg)
2933                                 break;
2934                         if (!aalg->pfkey_supported)
2935                                 continue;
2936                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2937                                 continue;
2938                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2939                         memset(c, 0, sizeof(*c));
2940                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2941                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2942                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2943                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2944                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2945                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2946                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2947                         c->sadb_comb_hard_addtime = 24*60*60;
2948                         c->sadb_comb_soft_addtime = 20*60*60;
2949                         c->sadb_comb_hard_usetime = 8*60*60;
2950                         c->sadb_comb_soft_usetime = 7*60*60;
2951                 }
2952         }
2953 }
2954
2955 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2956 {
2957         return 0;
2958 }
2959
2960 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2961 {
2962         struct sk_buff *out_skb;
2963         struct sadb_msg *out_hdr;
2964         int hard;
2965         int hsc;
2966
2967         hard = c->data.hard;
2968         if (hard)
2969                 hsc = 2;
2970         else
2971                 hsc = 1;
2972
2973         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2974         if (IS_ERR(out_skb))
2975                 return PTR_ERR(out_skb);
2976
2977         out_hdr = (struct sadb_msg *) out_skb->data;
2978         out_hdr->sadb_msg_version = PF_KEY_V2;
2979         out_hdr->sadb_msg_type = SADB_EXPIRE;
2980         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2981         out_hdr->sadb_msg_errno = 0;
2982         out_hdr->sadb_msg_reserved = 0;
2983         out_hdr->sadb_msg_seq = 0;
2984         out_hdr->sadb_msg_pid = 0;
2985
2986         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2987         return 0;
2988 }
2989
2990 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2991 {
2992         struct net *net = x ? xs_net(x) : c->net;
2993         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2994
2995         if (atomic_read(&net_pfkey->socks_nr) == 0)
2996                 return 0;
2997
2998         switch (c->event) {
2999         case XFRM_MSG_EXPIRE:
3000                 return key_notify_sa_expire(x, c);
3001         case XFRM_MSG_DELSA:
3002         case XFRM_MSG_NEWSA:
3003         case XFRM_MSG_UPDSA:
3004                 return key_notify_sa(x, c);
3005         case XFRM_MSG_FLUSHSA:
3006                 return key_notify_sa_flush(c);
3007         case XFRM_MSG_NEWAE: /* not yet supported */
3008                 break;
3009         default:
3010                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3011                 break;
3012         }
3013
3014         return 0;
3015 }
3016
3017 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3018 {
3019         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3020                 return 0;
3021
3022         switch (c->event) {
3023         case XFRM_MSG_POLEXPIRE:
3024                 return key_notify_policy_expire(xp, c);
3025         case XFRM_MSG_DELPOLICY:
3026         case XFRM_MSG_NEWPOLICY:
3027         case XFRM_MSG_UPDPOLICY:
3028                 return key_notify_policy(xp, dir, c);
3029         case XFRM_MSG_FLUSHPOLICY:
3030                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3031                         break;
3032                 return key_notify_policy_flush(c);
3033         default:
3034                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3035                 break;
3036         }
3037
3038         return 0;
3039 }
3040
3041 static u32 get_acqseq(void)
3042 {
3043         u32 res;
3044         static atomic_t acqseq;
3045
3046         do {
3047                 res = atomic_inc_return(&acqseq);
3048         } while (!res);
3049         return res;
3050 }
3051
3052 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3053 {
3054         struct sk_buff *skb;
3055         struct sadb_msg *hdr;
3056         struct sadb_address *addr;
3057         struct sadb_x_policy *pol;
3058         int sockaddr_size;
3059         int size;
3060         struct sadb_x_sec_ctx *sec_ctx;
3061         struct xfrm_sec_ctx *xfrm_ctx;
3062         int ctx_size = 0;
3063
3064         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3065         if (!sockaddr_size)
3066                 return -EINVAL;
3067
3068         size = sizeof(struct sadb_msg) +
3069                 (sizeof(struct sadb_address) * 2) +
3070                 (sockaddr_size * 2) +
3071                 sizeof(struct sadb_x_policy);
3072
3073         if (x->id.proto == IPPROTO_AH)
3074                 size += count_ah_combs(t);
3075         else if (x->id.proto == IPPROTO_ESP)
3076                 size += count_esp_combs(t);
3077
3078         if ((xfrm_ctx = x->security)) {
3079                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3080                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3081         }
3082
3083         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3084         if (skb == NULL)
3085                 return -ENOMEM;
3086
3087         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3088         hdr->sadb_msg_version = PF_KEY_V2;
3089         hdr->sadb_msg_type = SADB_ACQUIRE;
3090         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3091         hdr->sadb_msg_len = size / sizeof(uint64_t);
3092         hdr->sadb_msg_errno = 0;
3093         hdr->sadb_msg_reserved = 0;
3094         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3095         hdr->sadb_msg_pid = 0;
3096
3097         /* src address */
3098         addr = (struct sadb_address*) skb_put(skb,
3099                                               sizeof(struct sadb_address)+sockaddr_size);
3100         addr->sadb_address_len =
3101                 (sizeof(struct sadb_address)+sockaddr_size)/
3102                         sizeof(uint64_t);
3103         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3104         addr->sadb_address_proto = 0;
3105         addr->sadb_address_reserved = 0;
3106         addr->sadb_address_prefixlen =
3107                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3108                                     (struct sockaddr *) (addr + 1),
3109                                     x->props.family);
3110         if (!addr->sadb_address_prefixlen)
3111                 BUG();
3112
3113         /* dst address */
3114         addr = (struct sadb_address*) skb_put(skb,
3115                                               sizeof(struct sadb_address)+sockaddr_size);
3116         addr->sadb_address_len =
3117                 (sizeof(struct sadb_address)+sockaddr_size)/
3118                         sizeof(uint64_t);
3119         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3120         addr->sadb_address_proto = 0;
3121         addr->sadb_address_reserved = 0;
3122         addr->sadb_address_prefixlen =
3123                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3124                                     (struct sockaddr *) (addr + 1),
3125                                     x->props.family);
3126         if (!addr->sadb_address_prefixlen)
3127                 BUG();
3128
3129         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3130         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3131         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3132         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3133         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3134         pol->sadb_x_policy_id = xp->index;
3135
3136         /* Set sadb_comb's. */
3137         if (x->id.proto == IPPROTO_AH)
3138                 dump_ah_combs(skb, t);
3139         else if (x->id.proto == IPPROTO_ESP)
3140                 dump_esp_combs(skb, t);
3141
3142         /* security context */
3143         if (xfrm_ctx) {
3144                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3145                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3146                 sec_ctx->sadb_x_sec_len =
3147                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3148                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3149                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3150                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3151                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3152                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3153                        xfrm_ctx->ctx_len);
3154         }
3155
3156         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3157 }
3158
3159 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3160                                                 u8 *data, int len, int *dir)
3161 {
3162         struct net *net = sock_net(sk);
3163         struct xfrm_policy *xp;
3164         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3165         struct sadb_x_sec_ctx *sec_ctx;
3166
3167         switch (sk->sk_family) {
3168         case AF_INET:
3169                 if (opt != IP_IPSEC_POLICY) {
3170                         *dir = -EOPNOTSUPP;
3171                         return NULL;
3172                 }
3173                 break;
3174 #if IS_ENABLED(CONFIG_IPV6)
3175         case AF_INET6:
3176                 if (opt != IPV6_IPSEC_POLICY) {
3177                         *dir = -EOPNOTSUPP;
3178                         return NULL;
3179                 }
3180                 break;
3181 #endif
3182         default:
3183                 *dir = -EINVAL;
3184                 return NULL;
3185         }
3186
3187         *dir = -EINVAL;
3188
3189         if (len < sizeof(struct sadb_x_policy) ||
3190             pol->sadb_x_policy_len*8 > len ||
3191             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3192             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3193                 return NULL;
3194
3195         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3196         if (xp == NULL) {
3197                 *dir = -ENOBUFS;
3198                 return NULL;
3199         }
3200
3201         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3202                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3203
3204         xp->lft.soft_byte_limit = XFRM_INF;
3205         xp->lft.hard_byte_limit = XFRM_INF;
3206         xp->lft.soft_packet_limit = XFRM_INF;
3207         xp->lft.hard_packet_limit = XFRM_INF;
3208         xp->family = sk->sk_family;
3209
3210         xp->xfrm_nr = 0;
3211         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3212             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3213                 goto out;
3214
3215         /* security context too */
3216         if (len >= (pol->sadb_x_policy_len*8 +
3217             sizeof(struct sadb_x_sec_ctx))) {