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Linux/net/key/af_key.c

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  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         hdr->sadb_msg_reserved = 0;
1714 
1715         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716 
1717         return 0;
1718 }
1719 
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722         struct net *net = sock_net(sk);
1723         unsigned int proto;
1724         struct km_event c;
1725         struct xfrm_audit audit_info;
1726         int err, err2;
1727 
1728         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729         if (proto == 0)
1730                 return -EINVAL;
1731 
1732         audit_info.loginuid = audit_get_loginuid(current);
1733         audit_info.sessionid = audit_get_sessionid(current);
1734         audit_info.secid = 0;
1735         err = xfrm_state_flush(net, proto, &audit_info);
1736         err2 = unicast_flush_resp(sk, hdr);
1737         if (err || err2) {
1738                 if (err == -ESRCH) /* empty table - go quietly */
1739                         err = 0;
1740                 return err ? err : err2;
1741         }
1742 
1743         c.data.proto = proto;
1744         c.seq = hdr->sadb_msg_seq;
1745         c.portid = hdr->sadb_msg_pid;
1746         c.event = XFRM_MSG_FLUSHSA;
1747         c.net = net;
1748         km_state_notify(NULL, &c);
1749 
1750         return 0;
1751 }
1752 
1753 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1754 {
1755         struct pfkey_sock *pfk = ptr;
1756         struct sk_buff *out_skb;
1757         struct sadb_msg *out_hdr;
1758 
1759         if (!pfkey_can_dump(&pfk->sk))
1760                 return -ENOBUFS;
1761 
1762         out_skb = pfkey_xfrm_state2msg(x);
1763         if (IS_ERR(out_skb))
1764                 return PTR_ERR(out_skb);
1765 
1766         out_hdr = (struct sadb_msg *) out_skb->data;
1767         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1768         out_hdr->sadb_msg_type = SADB_DUMP;
1769         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1770         out_hdr->sadb_msg_errno = 0;
1771         out_hdr->sadb_msg_reserved = 0;
1772         out_hdr->sadb_msg_seq = count + 1;
1773         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1774 
1775         if (pfk->dump.skb)
1776                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1777                                 &pfk->sk, sock_net(&pfk->sk));
1778         pfk->dump.skb = out_skb;
1779 
1780         return 0;
1781 }
1782 
1783 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1784 {
1785         struct net *net = sock_net(&pfk->sk);
1786         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1787 }
1788 
1789 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1790 {
1791         xfrm_state_walk_done(&pfk->dump.u.state);
1792 }
1793 
1794 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1795 {
1796         u8 proto;
1797         struct pfkey_sock *pfk = pfkey_sk(sk);
1798 
1799         if (pfk->dump.dump != NULL)
1800                 return -EBUSY;
1801 
1802         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1803         if (proto == 0)
1804                 return -EINVAL;
1805 
1806         pfk->dump.msg_version = hdr->sadb_msg_version;
1807         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1808         pfk->dump.dump = pfkey_dump_sa;
1809         pfk->dump.done = pfkey_dump_sa_done;
1810         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1811 
1812         return pfkey_do_dump(pfk);
1813 }
1814 
1815 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1816 {
1817         struct pfkey_sock *pfk = pfkey_sk(sk);
1818         int satype = hdr->sadb_msg_satype;
1819         bool reset_errno = false;
1820 
1821         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1822                 reset_errno = true;
1823                 if (satype != 0 && satype != 1)
1824                         return -EINVAL;
1825                 pfk->promisc = satype;
1826         }
1827         if (reset_errno && skb_cloned(skb))
1828                 skb = skb_copy(skb, GFP_KERNEL);
1829         else
1830                 skb = skb_clone(skb, GFP_KERNEL);
1831 
1832         if (reset_errno && skb) {
1833                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1834                 new_hdr->sadb_msg_errno = 0;
1835         }
1836 
1837         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1838         return 0;
1839 }
1840 
1841 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1842 {
1843         int i;
1844         u32 reqid = *(u32*)ptr;
1845 
1846         for (i=0; i<xp->xfrm_nr; i++) {
1847                 if (xp->xfrm_vec[i].reqid == reqid)
1848                         return -EEXIST;
1849         }
1850         return 0;
1851 }
1852 
1853 static u32 gen_reqid(struct net *net)
1854 {
1855         struct xfrm_policy_walk walk;
1856         u32 start;
1857         int rc;
1858         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1859 
1860         start = reqid;
1861         do {
1862                 ++reqid;
1863                 if (reqid == 0)
1864                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1865                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1866                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1867                 xfrm_policy_walk_done(&walk);
1868                 if (rc != -EEXIST)
1869                         return reqid;
1870         } while (reqid != start);
1871         return 0;
1872 }
1873 
1874 static int
1875 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1876 {
1877         struct net *net = xp_net(xp);
1878         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1879         int mode;
1880 
1881         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1882                 return -ELOOP;
1883 
1884         if (rq->sadb_x_ipsecrequest_mode == 0)
1885                 return -EINVAL;
1886 
1887         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1888         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1889                 return -EINVAL;
1890         t->mode = mode;
1891         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1892                 t->optional = 1;
1893         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1894                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1895                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1896                         t->reqid = 0;
1897                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1898                         return -ENOBUFS;
1899         }
1900 
1901         /* addresses present only in tunnel mode */
1902         if (t->mode == XFRM_MODE_TUNNEL) {
1903                 u8 *sa = (u8 *) (rq + 1);
1904                 int family, socklen;
1905 
1906                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1907                                                 &t->saddr);
1908                 if (!family)
1909                         return -EINVAL;
1910 
1911                 socklen = pfkey_sockaddr_len(family);
1912                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1913                                            &t->id.daddr) != family)
1914                         return -EINVAL;
1915                 t->encap_family = family;
1916         } else
1917                 t->encap_family = xp->family;
1918 
1919         /* No way to set this via kame pfkey */
1920         t->allalgs = 1;
1921         xp->xfrm_nr++;
1922         return 0;
1923 }
1924 
1925 static int
1926 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1927 {
1928         int err;
1929         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1930         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1931 
1932         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1933                 return -EINVAL;
1934 
1935         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1936                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1937                         return err;
1938                 len -= rq->sadb_x_ipsecrequest_len;
1939                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1940         }
1941         return 0;
1942 }
1943 
1944 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1945 {
1946   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1947 
1948         if (xfrm_ctx) {
1949                 int len = sizeof(struct sadb_x_sec_ctx);
1950                 len += xfrm_ctx->ctx_len;
1951                 return PFKEY_ALIGN8(len);
1952         }
1953         return 0;
1954 }
1955 
1956 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1957 {
1958         const struct xfrm_tmpl *t;
1959         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1960         int socklen = 0;
1961         int i;
1962 
1963         for (i=0; i<xp->xfrm_nr; i++) {
1964                 t = xp->xfrm_vec + i;
1965                 socklen += pfkey_sockaddr_len(t->encap_family);
1966         }
1967 
1968         return sizeof(struct sadb_msg) +
1969                 (sizeof(struct sadb_lifetime) * 3) +
1970                 (sizeof(struct sadb_address) * 2) +
1971                 (sockaddr_size * 2) +
1972                 sizeof(struct sadb_x_policy) +
1973                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1974                 (socklen * 2) +
1975                 pfkey_xfrm_policy2sec_ctx_size(xp);
1976 }
1977 
1978 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1979 {
1980         struct sk_buff *skb;
1981         int size;
1982 
1983         size = pfkey_xfrm_policy2msg_size(xp);
1984 
1985         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1986         if (skb == NULL)
1987                 return ERR_PTR(-ENOBUFS);
1988 
1989         return skb;
1990 }
1991 
1992 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1993 {
1994         struct sadb_msg *hdr;
1995         struct sadb_address *addr;
1996         struct sadb_lifetime *lifetime;
1997         struct sadb_x_policy *pol;
1998         struct sadb_x_sec_ctx *sec_ctx;
1999         struct xfrm_sec_ctx *xfrm_ctx;
2000         int i;
2001         int size;
2002         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2003         int socklen = pfkey_sockaddr_len(xp->family);
2004 
2005         size = pfkey_xfrm_policy2msg_size(xp);
2006 
2007         /* call should fill header later */
2008         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2009         memset(hdr, 0, size);   /* XXX do we need this ? */
2010 
2011         /* src address */
2012         addr = (struct sadb_address*) skb_put(skb,
2013                                               sizeof(struct sadb_address)+sockaddr_size);
2014         addr->sadb_address_len =
2015                 (sizeof(struct sadb_address)+sockaddr_size)/
2016                         sizeof(uint64_t);
2017         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2018         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2019         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2020         addr->sadb_address_reserved = 0;
2021         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2022                                  xp->selector.sport,
2023                                  (struct sockaddr *) (addr + 1),
2024                                  xp->family))
2025                 BUG();
2026 
2027         /* dst address */
2028         addr = (struct sadb_address*) skb_put(skb,
2029                                               sizeof(struct sadb_address)+sockaddr_size);
2030         addr->sadb_address_len =
2031                 (sizeof(struct sadb_address)+sockaddr_size)/
2032                         sizeof(uint64_t);
2033         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2034         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2035         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2036         addr->sadb_address_reserved = 0;
2037 
2038         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2039                             (struct sockaddr *) (addr + 1),
2040                             xp->family);
2041 
2042         /* hard time */
2043         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2044                                                      sizeof(struct sadb_lifetime));
2045         lifetime->sadb_lifetime_len =
2046                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2048         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2049         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2050         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2051         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2052         /* soft time */
2053         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2054                                                      sizeof(struct sadb_lifetime));
2055         lifetime->sadb_lifetime_len =
2056                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2057         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2058         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2059         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2060         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2061         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2062         /* current time */
2063         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2064                                                      sizeof(struct sadb_lifetime));
2065         lifetime->sadb_lifetime_len =
2066                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2067         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2068         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2069         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2070         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2071         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2072 
2073         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2074         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2075         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2076         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2077         if (xp->action == XFRM_POLICY_ALLOW) {
2078                 if (xp->xfrm_nr)
2079                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2080                 else
2081                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2082         }
2083         pol->sadb_x_policy_dir = dir+1;
2084         pol->sadb_x_policy_reserved = 0;
2085         pol->sadb_x_policy_id = xp->index;
2086         pol->sadb_x_policy_priority = xp->priority;
2087 
2088         for (i=0; i<xp->xfrm_nr; i++) {
2089                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2090                 struct sadb_x_ipsecrequest *rq;
2091                 int req_size;
2092                 int mode;
2093 
2094                 req_size = sizeof(struct sadb_x_ipsecrequest);
2095                 if (t->mode == XFRM_MODE_TUNNEL) {
2096                         socklen = pfkey_sockaddr_len(t->encap_family);
2097                         req_size += socklen * 2;
2098                 } else {
2099                         size -= 2*socklen;
2100                 }
2101                 rq = (void*)skb_put(skb, req_size);
2102                 pol->sadb_x_policy_len += req_size/8;
2103                 memset(rq, 0, sizeof(*rq));
2104                 rq->sadb_x_ipsecrequest_len = req_size;
2105                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2106                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2107                         return -EINVAL;
2108                 rq->sadb_x_ipsecrequest_mode = mode;
2109                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2110                 if (t->reqid)
2111                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2112                 if (t->optional)
2113                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2114                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2115 
2116                 if (t->mode == XFRM_MODE_TUNNEL) {
2117                         u8 *sa = (void *)(rq + 1);
2118                         pfkey_sockaddr_fill(&t->saddr, 0,
2119                                             (struct sockaddr *)sa,
2120                                             t->encap_family);
2121                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2122                                             (struct sockaddr *) (sa + socklen),
2123                                             t->encap_family);
2124                 }
2125         }
2126 
2127         /* security context */
2128         if ((xfrm_ctx = xp->security)) {
2129                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2130 
2131                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2132                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2133                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2134                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2135                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2136                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2137                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2138                        xfrm_ctx->ctx_len);
2139         }
2140 
2141         hdr->sadb_msg_len = size / sizeof(uint64_t);
2142         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2143 
2144         return 0;
2145 }
2146 
2147 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2148 {
2149         struct sk_buff *out_skb;
2150         struct sadb_msg *out_hdr;
2151         int err;
2152 
2153         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2154         if (IS_ERR(out_skb))
2155                 return PTR_ERR(out_skb);
2156 
2157         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2158         if (err < 0)
2159                 return err;
2160 
2161         out_hdr = (struct sadb_msg *) out_skb->data;
2162         out_hdr->sadb_msg_version = PF_KEY_V2;
2163 
2164         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2165                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2166         else
2167                 out_hdr->sadb_msg_type = event2poltype(c->event);
2168         out_hdr->sadb_msg_errno = 0;
2169         out_hdr->sadb_msg_seq = c->seq;
2170         out_hdr->sadb_msg_pid = c->portid;
2171         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2172         return 0;
2173 
2174 }
2175 
2176 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2177 {
2178         struct net *net = sock_net(sk);
2179         int err = 0;
2180         struct sadb_lifetime *lifetime;
2181         struct sadb_address *sa;
2182         struct sadb_x_policy *pol;
2183         struct xfrm_policy *xp;
2184         struct km_event c;
2185         struct sadb_x_sec_ctx *sec_ctx;
2186 
2187         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2188                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2189             !ext_hdrs[SADB_X_EXT_POLICY-1])
2190                 return -EINVAL;
2191 
2192         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2193         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2194                 return -EINVAL;
2195         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2196                 return -EINVAL;
2197 
2198         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2199         if (xp == NULL)
2200                 return -ENOBUFS;
2201 
2202         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2203                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2204         xp->priority = pol->sadb_x_policy_priority;
2205 
2206         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2207         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2208         if (!xp->family) {
2209                 err = -EINVAL;
2210                 goto out;
2211         }
2212         xp->selector.family = xp->family;
2213         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2214         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2215         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2216         if (xp->selector.sport)
2217                 xp->selector.sport_mask = htons(0xffff);
2218 
2219         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2220         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2221         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2222 
2223         /* Amusing, we set this twice.  KAME apps appear to set same value
2224          * in both addresses.
2225          */
2226         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2227 
2228         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2229         if (xp->selector.dport)
2230                 xp->selector.dport_mask = htons(0xffff);
2231 
2232         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2233         if (sec_ctx != NULL) {
2234                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2235 
2236                 if (!uctx) {
2237                         err = -ENOBUFS;
2238                         goto out;
2239                 }
2240 
2241                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2242                 kfree(uctx);
2243 
2244                 if (err)
2245                         goto out;
2246         }
2247 
2248         xp->lft.soft_byte_limit = XFRM_INF;
2249         xp->lft.hard_byte_limit = XFRM_INF;
2250         xp->lft.soft_packet_limit = XFRM_INF;
2251         xp->lft.hard_packet_limit = XFRM_INF;
2252         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2253                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2254                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2255                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2256                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2257         }
2258         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2259                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2260                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2261                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2262                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2263         }
2264         xp->xfrm_nr = 0;
2265         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2266             (err = parse_ipsecrequests(xp, pol)) < 0)
2267                 goto out;
2268 
2269         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2270                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2271 
2272         xfrm_audit_policy_add(xp, err ? 0 : 1,
2273                               audit_get_loginuid(current),
2274                               audit_get_sessionid(current), 0);
2275 
2276         if (err)
2277                 goto out;
2278 
2279         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2280                 c.event = XFRM_MSG_UPDPOLICY;
2281         else
2282                 c.event = XFRM_MSG_NEWPOLICY;
2283 
2284         c.seq = hdr->sadb_msg_seq;
2285         c.portid = hdr->sadb_msg_pid;
2286 
2287         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2288         xfrm_pol_put(xp);
2289         return 0;
2290 
2291 out:
2292         xp->walk.dead = 1;
2293         xfrm_policy_destroy(xp);
2294         return err;
2295 }
2296 
2297 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2298 {
2299         struct net *net = sock_net(sk);
2300         int err;
2301         struct sadb_address *sa;
2302         struct sadb_x_policy *pol;
2303         struct xfrm_policy *xp;
2304         struct xfrm_selector sel;
2305         struct km_event c;
2306         struct sadb_x_sec_ctx *sec_ctx;
2307         struct xfrm_sec_ctx *pol_ctx = NULL;
2308 
2309         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2310                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2311             !ext_hdrs[SADB_X_EXT_POLICY-1])
2312                 return -EINVAL;
2313 
2314         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2315         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2316                 return -EINVAL;
2317 
2318         memset(&sel, 0, sizeof(sel));
2319 
2320         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2321         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2322         sel.prefixlen_s = sa->sadb_address_prefixlen;
2323         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2324         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2325         if (sel.sport)
2326                 sel.sport_mask = htons(0xffff);
2327 
2328         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2329         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2330         sel.prefixlen_d = sa->sadb_address_prefixlen;
2331         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2332         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2333         if (sel.dport)
2334                 sel.dport_mask = htons(0xffff);
2335 
2336         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2337         if (sec_ctx != NULL) {
2338                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2339 
2340                 if (!uctx)
2341                         return -ENOMEM;
2342 
2343                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2344                 kfree(uctx);
2345                 if (err)
2346                         return err;
2347         }
2348 
2349         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2350                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2351                                    1, &err);
2352         security_xfrm_policy_free(pol_ctx);
2353         if (xp == NULL)
2354                 return -ENOENT;
2355 
2356         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2357                                  audit_get_loginuid(current),
2358                                  audit_get_sessionid(current), 0);
2359 
2360         if (err)
2361                 goto out;
2362 
2363         c.seq = hdr->sadb_msg_seq;
2364         c.portid = hdr->sadb_msg_pid;
2365         c.data.byid = 0;
2366         c.event = XFRM_MSG_DELPOLICY;
2367         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2368 
2369 out:
2370         xfrm_pol_put(xp);
2371         if (err == 0)
2372                 xfrm_garbage_collect(net);
2373         return err;
2374 }
2375 
2376 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2377 {
2378         int err;
2379         struct sk_buff *out_skb;
2380         struct sadb_msg *out_hdr;
2381         err = 0;
2382 
2383         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2384         if (IS_ERR(out_skb)) {
2385                 err =  PTR_ERR(out_skb);
2386                 goto out;
2387         }
2388         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2389         if (err < 0)
2390                 goto out;
2391 
2392         out_hdr = (struct sadb_msg *) out_skb->data;
2393         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2394         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2395         out_hdr->sadb_msg_satype = 0;
2396         out_hdr->sadb_msg_errno = 0;
2397         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2398         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2399         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2400         err = 0;
2401 
2402 out:
2403         return err;
2404 }
2405 
2406 #ifdef CONFIG_NET_KEY_MIGRATE
2407 static int pfkey_sockaddr_pair_size(sa_family_t family)
2408 {
2409         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2410 }
2411 
2412 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2413                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2414                                u16 *family)
2415 {
2416         int af, socklen;
2417 
2418         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2419                 return -EINVAL;
2420 
2421         af = pfkey_sockaddr_extract(sa, saddr);
2422         if (!af)
2423                 return -EINVAL;
2424 
2425         socklen = pfkey_sockaddr_len(af);
2426         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2427                                    daddr) != af)
2428                 return -EINVAL;
2429 
2430         *family = af;
2431         return 0;
2432 }
2433 
2434 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2435                                     struct xfrm_migrate *m)
2436 {
2437         int err;
2438         struct sadb_x_ipsecrequest *rq2;
2439         int mode;
2440 
2441         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2442             len < rq1->sadb_x_ipsecrequest_len)
2443                 return -EINVAL;
2444 
2445         /* old endoints */
2446         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2447                                   rq1->sadb_x_ipsecrequest_len,
2448                                   &m->old_saddr, &m->old_daddr,
2449                                   &m->old_family);
2450         if (err)
2451                 return err;
2452 
2453         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2454         len -= rq1->sadb_x_ipsecrequest_len;
2455 
2456         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2457             len < rq2->sadb_x_ipsecrequest_len)
2458                 return -EINVAL;
2459 
2460         /* new endpoints */
2461         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2462                                   rq2->sadb_x_ipsecrequest_len,
2463                                   &m->new_saddr, &m->new_daddr,
2464                                   &m->new_family);
2465         if (err)
2466                 return err;
2467 
2468         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2469             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2470             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2471                 return -EINVAL;
2472 
2473         m->proto = rq1->sadb_x_ipsecrequest_proto;
2474         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2475                 return -EINVAL;
2476         m->mode = mode;
2477         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2478 
2479         return ((int)(rq1->sadb_x_ipsecrequest_len +
2480                       rq2->sadb_x_ipsecrequest_len));
2481 }
2482 
2483 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2484                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2485 {
2486         int i, len, ret, err = -EINVAL;
2487         u8 dir;
2488         struct sadb_address *sa;
2489         struct sadb_x_kmaddress *kma;
2490         struct sadb_x_policy *pol;
2491         struct sadb_x_ipsecrequest *rq;
2492         struct xfrm_selector sel;
2493         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2494         struct xfrm_kmaddress k;
2495 
2496         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2497                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2498             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2499                 err = -EINVAL;
2500                 goto out;
2501         }
2502 
2503         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2504         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2505 
2506         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2507                 err = -EINVAL;
2508                 goto out;
2509         }
2510 
2511         if (kma) {
2512                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2513                 k.reserved = kma->sadb_x_kmaddress_reserved;
2514                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2515                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2516                                           &k.local, &k.remote, &k.family);
2517                 if (ret < 0) {
2518                         err = ret;
2519                         goto out;
2520                 }
2521         }
2522 
2523         dir = pol->sadb_x_policy_dir - 1;
2524         memset(&sel, 0, sizeof(sel));
2525 
2526         /* set source address info of selector */
2527         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2528         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2529         sel.prefixlen_s = sa->sadb_address_prefixlen;
2530         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2531         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2532         if (sel.sport)
2533                 sel.sport_mask = htons(0xffff);
2534 
2535         /* set destination address info of selector */
2536         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2537         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2538         sel.prefixlen_d = sa->sadb_address_prefixlen;
2539         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2540         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2541         if (sel.dport)
2542                 sel.dport_mask = htons(0xffff);
2543 
2544         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2545 
2546         /* extract ipsecrequests */
2547         i = 0;
2548         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2549 
2550         while (len > 0 && i < XFRM_MAX_DEPTH) {
2551                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2552                 if (ret < 0) {
2553                         err = ret;
2554                         goto out;
2555                 } else {
2556                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2557                         len -= ret;
2558                         i++;
2559                 }
2560         }
2561 
2562         if (!i || len > 0) {
2563                 err = -EINVAL;
2564                 goto out;
2565         }
2566 
2567         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2568                             kma ? &k : NULL);
2569 
2570  out:
2571         return err;
2572 }
2573 #else
2574 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2575                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2576 {
2577         return -ENOPROTOOPT;
2578 }
2579 #endif
2580 
2581 
2582 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2583 {
2584         struct net *net = sock_net(sk);
2585         unsigned int dir;
2586         int err = 0, delete;
2587         struct sadb_x_policy *pol;
2588         struct xfrm_policy *xp;
2589         struct km_event c;
2590 
2591         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2592                 return -EINVAL;
2593 
2594         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2595         if (dir >= XFRM_POLICY_MAX)
2596                 return -EINVAL;
2597 
2598         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2599         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2600                               dir, pol->sadb_x_policy_id, delete, &err);
2601         if (xp == NULL)
2602                 return -ENOENT;
2603 
2604         if (delete) {
2605                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2606                                 audit_get_loginuid(current),
2607                                 audit_get_sessionid(current), 0);
2608 
2609                 if (err)
2610                         goto out;
2611                 c.seq = hdr->sadb_msg_seq;
2612                 c.portid = hdr->sadb_msg_pid;
2613                 c.data.byid = 1;
2614                 c.event = XFRM_MSG_DELPOLICY;
2615                 km_policy_notify(xp, dir, &c);
2616         } else {
2617                 err = key_pol_get_resp(sk, xp, hdr, dir);
2618         }
2619 
2620 out:
2621         xfrm_pol_put(xp);
2622         if (delete && err == 0)
2623                 xfrm_garbage_collect(net);
2624         return err;
2625 }
2626 
2627 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2628 {
2629         struct pfkey_sock *pfk = ptr;
2630         struct sk_buff *out_skb;
2631         struct sadb_msg *out_hdr;
2632         int err;
2633 
2634         if (!pfkey_can_dump(&pfk->sk))
2635                 return -ENOBUFS;
2636 
2637         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2638         if (IS_ERR(out_skb))
2639                 return PTR_ERR(out_skb);
2640 
2641         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2642         if (err < 0)
2643                 return err;
2644 
2645         out_hdr = (struct sadb_msg *) out_skb->data;
2646         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2647         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2648         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2649         out_hdr->sadb_msg_errno = 0;
2650         out_hdr->sadb_msg_seq = count + 1;
2651         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2652 
2653         if (pfk->dump.skb)
2654                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2655                                 &pfk->sk, sock_net(&pfk->sk));
2656         pfk->dump.skb = out_skb;
2657 
2658         return 0;
2659 }
2660 
2661 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2662 {
2663         struct net *net = sock_net(&pfk->sk);
2664         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2665 }
2666 
2667 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2668 {
2669         xfrm_policy_walk_done(&pfk->dump.u.policy);
2670 }
2671 
2672 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2673 {
2674         struct pfkey_sock *pfk = pfkey_sk(sk);
2675 
2676         if (pfk->dump.dump != NULL)
2677                 return -EBUSY;
2678 
2679         pfk->dump.msg_version = hdr->sadb_msg_version;
2680         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2681         pfk->dump.dump = pfkey_dump_sp;
2682         pfk->dump.done = pfkey_dump_sp_done;
2683         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2684 
2685         return pfkey_do_dump(pfk);
2686 }
2687 
2688 static int key_notify_policy_flush(const struct km_event *c)
2689 {
2690         struct sk_buff *skb_out;
2691         struct sadb_msg *hdr;
2692 
2693         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2694         if (!skb_out)
2695                 return -ENOBUFS;
2696         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2697         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2698         hdr->sadb_msg_seq = c->seq;
2699         hdr->sadb_msg_pid = c->portid;
2700         hdr->sadb_msg_version = PF_KEY_V2;
2701         hdr->sadb_msg_errno = (uint8_t) 0;
2702         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2703         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2704         hdr->sadb_msg_reserved = 0;
2705         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2706         return 0;
2707 
2708 }
2709 
2710 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2711 {
2712         struct net *net = sock_net(sk);
2713         struct km_event c;
2714         struct xfrm_audit audit_info;
2715         int err, err2;
2716 
2717         audit_info.loginuid = audit_get_loginuid(current);
2718         audit_info.sessionid = audit_get_sessionid(current);
2719         audit_info.secid = 0;
2720         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2721         err2 = unicast_flush_resp(sk, hdr);
2722         if (err || err2) {
2723                 if (err == -ESRCH) /* empty table - old silent behavior */
2724                         return 0;
2725                 return err;
2726         }
2727 
2728         c.data.type = XFRM_POLICY_TYPE_MAIN;
2729         c.event = XFRM_MSG_FLUSHPOLICY;
2730         c.portid = hdr->sadb_msg_pid;
2731         c.seq = hdr->sadb_msg_seq;
2732         c.net = net;
2733         km_policy_notify(NULL, 0, &c);
2734 
2735         return 0;
2736 }
2737 
2738 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2739                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2740 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2741         [SADB_RESERVED]         = pfkey_reserved,
2742         [SADB_GETSPI]           = pfkey_getspi,
2743         [SADB_UPDATE]           = pfkey_add,
2744         [SADB_ADD]              = pfkey_add,
2745         [SADB_DELETE]           = pfkey_delete,
2746         [SADB_GET]              = pfkey_get,
2747         [SADB_ACQUIRE]          = pfkey_acquire,
2748         [SADB_REGISTER]         = pfkey_register,
2749         [SADB_EXPIRE]           = NULL,
2750         [SADB_FLUSH]            = pfkey_flush,
2751         [SADB_DUMP]             = pfkey_dump,
2752         [SADB_X_PROMISC]        = pfkey_promisc,
2753         [SADB_X_PCHANGE]        = NULL,
2754         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2755         [SADB_X_SPDADD]         = pfkey_spdadd,
2756         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2757         [SADB_X_SPDGET]         = pfkey_spdget,
2758         [SADB_X_SPDACQUIRE]     = NULL,
2759         [SADB_X_SPDDUMP]        = pfkey_spddump,
2760         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2761         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2762         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2763         [SADB_X_MIGRATE]        = pfkey_migrate,
2764 };
2765 
2766 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2767 {
2768         void *ext_hdrs[SADB_EXT_MAX];
2769         int err;
2770 
2771         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2772                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2773 
2774         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2775         err = parse_exthdrs(skb, hdr, ext_hdrs);
2776         if (!err) {
2777                 err = -EOPNOTSUPP;
2778                 if (pfkey_funcs[hdr->sadb_msg_type])
2779                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2780         }
2781         return err;
2782 }
2783 
2784 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2785 {
2786         struct sadb_msg *hdr = NULL;
2787 
2788         if (skb->len < sizeof(*hdr)) {
2789                 *errp = -EMSGSIZE;
2790         } else {
2791                 hdr = (struct sadb_msg *) skb->data;
2792                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2793                     hdr->sadb_msg_reserved != 0 ||
2794                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2795                      hdr->sadb_msg_type > SADB_MAX)) {
2796                         hdr = NULL;
2797                         *errp = -EINVAL;
2798                 } else if (hdr->sadb_msg_len != (skb->len /
2799                                                  sizeof(uint64_t)) ||
2800                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2801                                                 sizeof(uint64_t))) {
2802                         hdr = NULL;
2803                         *errp = -EMSGSIZE;
2804                 } else {
2805                         *errp = 0;
2806                 }
2807         }
2808         return hdr;
2809 }
2810 
2811 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2812                                 const struct xfrm_algo_desc *d)
2813 {
2814         unsigned int id = d->desc.sadb_alg_id;
2815 
2816         if (id >= sizeof(t->aalgos) * 8)
2817                 return 0;
2818 
2819         return (t->aalgos >> id) & 1;
2820 }
2821 
2822 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2823                                 const struct xfrm_algo_desc *d)
2824 {
2825         unsigned int id = d->desc.sadb_alg_id;
2826 
2827         if (id >= sizeof(t->ealgos) * 8)
2828                 return 0;
2829 
2830         return (t->ealgos >> id) & 1;
2831 }
2832 
2833 static int count_ah_combs(const struct xfrm_tmpl *t)
2834 {
2835         int i, sz = 0;
2836 
2837         for (i = 0; ; i++) {
2838                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2839                 if (!aalg)
2840                         break;
2841                 if (!aalg->pfkey_supported)
2842                         continue;
2843                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2844                         sz += sizeof(struct sadb_comb);
2845         }
2846         return sz + sizeof(struct sadb_prop);
2847 }
2848 
2849 static int count_esp_combs(const struct xfrm_tmpl *t)
2850 {
2851         int i, k, sz = 0;
2852 
2853         for (i = 0; ; i++) {
2854                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2855                 if (!ealg)
2856                         break;
2857 
2858                 if (!ealg->pfkey_supported)
2859                         continue;
2860 
2861                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2862                         continue;
2863 
2864                 for (k = 1; ; k++) {
2865                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2866                         if (!aalg)
2867                                 break;
2868 
2869                         if (!aalg->pfkey_supported)
2870                                 continue;
2871 
2872                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2873                                 sz += sizeof(struct sadb_comb);
2874                 }
2875         }
2876         return sz + sizeof(struct sadb_prop);
2877 }
2878 
2879 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2880 {
2881         struct sadb_prop *p;
2882         int i;
2883 
2884         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2885         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2886         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2887         p->sadb_prop_replay = 32;
2888         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2889 
2890         for (i = 0; ; i++) {
2891                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2892                 if (!aalg)
2893                         break;
2894 
2895                 if (!aalg->pfkey_supported)
2896                         continue;
2897 
2898                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2899                         struct sadb_comb *c;
2900                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2901                         memset(c, 0, sizeof(*c));
2902                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2903                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2904                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2905                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2906                         c->sadb_comb_hard_addtime = 24*60*60;
2907                         c->sadb_comb_soft_addtime = 20*60*60;
2908                         c->sadb_comb_hard_usetime = 8*60*60;
2909                         c->sadb_comb_soft_usetime = 7*60*60;
2910                 }
2911         }
2912 }
2913 
2914 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2915 {
2916         struct sadb_prop *p;
2917         int i, k;
2918 
2919         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2920         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2921         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2922         p->sadb_prop_replay = 32;
2923         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2924 
2925         for (i=0; ; i++) {
2926                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2927                 if (!ealg)
2928                         break;
2929 
2930                 if (!ealg->pfkey_supported)
2931                         continue;
2932 
2933                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2934                         continue;
2935 
2936                 for (k = 1; ; k++) {
2937                         struct sadb_comb *c;
2938                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2939                         if (!aalg)
2940                                 break;
2941                         if (!aalg->pfkey_supported)
2942                                 continue;
2943                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2944                                 continue;
2945                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2946                         memset(c, 0, sizeof(*c));
2947                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2948                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2949                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2950                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2951                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2952                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2953                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2954                         c->sadb_comb_hard_addtime = 24*60*60;
2955                         c->sadb_comb_soft_addtime = 20*60*60;
2956                         c->sadb_comb_hard_usetime = 8*60*60;
2957                         c->sadb_comb_soft_usetime = 7*60*60;
2958                 }
2959         }
2960 }
2961 
2962 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2963 {
2964         return 0;
2965 }
2966 
2967 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2968 {
2969         struct sk_buff *out_skb;
2970         struct sadb_msg *out_hdr;
2971         int hard;
2972         int hsc;
2973 
2974         hard = c->data.hard;
2975         if (hard)
2976                 hsc = 2;
2977         else
2978                 hsc = 1;
2979 
2980         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2981         if (IS_ERR(out_skb))
2982                 return PTR_ERR(out_skb);
2983 
2984         out_hdr = (struct sadb_msg *) out_skb->data;
2985         out_hdr->sadb_msg_version = PF_KEY_V2;
2986         out_hdr->sadb_msg_type = SADB_EXPIRE;
2987         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2988         out_hdr->sadb_msg_errno = 0;
2989         out_hdr->sadb_msg_reserved = 0;
2990         out_hdr->sadb_msg_seq = 0;
2991         out_hdr->sadb_msg_pid = 0;
2992 
2993         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2994         return 0;
2995 }
2996 
2997 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2998 {
2999         struct net *net = x ? xs_net(x) : c->net;
3000         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3001 
3002         if (atomic_read(&net_pfkey->socks_nr) == 0)
3003                 return 0;
3004 
3005         switch (c->event) {
3006         case XFRM_MSG_EXPIRE:
3007                 return key_notify_sa_expire(x, c);
3008         case XFRM_MSG_DELSA:
3009         case XFRM_MSG_NEWSA:
3010         case XFRM_MSG_UPDSA:
3011                 return key_notify_sa(x, c);
3012         case XFRM_MSG_FLUSHSA:
3013                 return key_notify_sa_flush(c);
3014         case XFRM_MSG_NEWAE: /* not yet supported */
3015                 break;
3016         default:
3017                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3018                 break;
3019         }
3020 
3021         return 0;
3022 }
3023 
3024 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3025 {
3026         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3027                 return 0;
3028 
3029         switch (c->event) {
3030         case XFRM_MSG_POLEXPIRE:
3031                 return key_notify_policy_expire(xp, c);
3032         case XFRM_MSG_DELPOLICY:
3033         case XFRM_MSG_NEWPOLICY:
3034         case XFRM_MSG_UPDPOLICY:
3035                 return key_notify_policy(xp, dir, c);
3036         case XFRM_MSG_FLUSHPOLICY:
3037                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3038                         break;
3039                 return key_notify_policy_flush(c);
3040         default:
3041                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3042                 break;
3043         }
3044 
3045         return 0;
3046 }
3047 
3048 static u32 get_acqseq(void)
3049 {
3050         u32 res;
3051         static atomic_t acqseq;
3052 
3053         do {
3054                 res = atomic_inc_return(&acqseq);
3055         } while (!res);
3056         return res;
3057 }
3058 
3059 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3060 {
3061         struct sk_buff *skb;
3062         struct sadb_msg *hdr;
3063         struct sadb_address *addr;
3064         struct sadb_x_policy *pol;
3065         int sockaddr_size;
3066         int size;
3067         struct sadb_x_sec_ctx *sec_ctx;
3068         struct xfrm_sec_ctx *xfrm_ctx;
3069         int ctx_size = 0;
3070 
3071         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3072         if (!sockaddr_size)
3073                 return -EINVAL;
3074 
3075         size = sizeof(struct sadb_msg) +
3076                 (sizeof(struct sadb_address) * 2) +
3077                 (sockaddr_size * 2) +
3078                 sizeof(struct sadb_x_policy);
3079 
3080         if (x->id.proto == IPPROTO_AH)
3081                 size += count_ah_combs(t);
3082         else if (x->id.proto == IPPROTO_ESP)
3083                 size += count_esp_combs(t);
3084 
3085         if ((xfrm_ctx = x->security)) {
3086                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3087                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3088         }
3089 
3090         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3091         if (skb == NULL)
3092                 return -ENOMEM;
3093 
3094         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3095         hdr->sadb_msg_version = PF_KEY_V2;
3096         hdr->sadb_msg_type = SADB_ACQUIRE;
3097         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3098         hdr->sadb_msg_len = size / sizeof(uint64_t);
3099         hdr->sadb_msg_errno = 0;
3100         hdr->sadb_msg_reserved = 0;
3101         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3102         hdr->sadb_msg_pid = 0;
3103 
3104         /* src address */
3105         addr = (struct sadb_address*) skb_put(skb,
3106                                               sizeof(struct sadb_address)+sockaddr_size);
3107         addr->sadb_address_len =
3108                 (sizeof(struct sadb_address)+sockaddr_size)/
3109                         sizeof(uint64_t);
3110         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3111         addr->sadb_address_proto = 0;
3112         addr->sadb_address_reserved = 0;
3113         addr->sadb_address_prefixlen =
3114                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3115                                     (struct sockaddr *) (addr + 1),
3116                                     x->props.family);
3117         if (!addr->sadb_address_prefixlen)
3118                 BUG();
3119 
3120         /* dst address */
3121         addr = (struct sadb_address*) skb_put(skb,
3122                                               sizeof(struct sadb_address)+sockaddr_size);
3123         addr->sadb_address_len =
3124                 (sizeof(struct sadb_address)+sockaddr_size)/
3125                         sizeof(uint64_t);
3126         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3127         addr->sadb_address_proto = 0;
3128         addr->sadb_address_reserved = 0;
3129         addr->sadb_address_prefixlen =
3130                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3131                                     (struct sockaddr *) (addr + 1),
3132                                     x->props.family);
3133         if (!addr->sadb_address_prefixlen)
3134                 BUG();
3135 
3136         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3137         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3138         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3139         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3140         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3141         pol->sadb_x_policy_reserved = 0;
3142         pol->sadb_x_policy_id = xp->index;
3143         pol->sadb_x_policy_priority = xp->priority;
3144 
3145         /* Set sadb_comb's. */
3146         if (x->id.proto == IPPROTO_AH)
3147                 dump_ah_combs(skb, t);
3148         else if (x->id.proto == IPPROTO_ESP)
3149                 dump_esp_combs(skb, t);
3150 
3151         /* security context */
3152         if (xfrm_ctx) {
3153                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3154                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3155                 sec_ctx->sadb_x_sec_len =
3156                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3157                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3158                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3159                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3160                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3161                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3162                        xfrm_ctx->ctx_len);
3163         }
3164 
3165         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3166 }
3167 
3168 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3169                                                 u8 *data, int len, int *dir)
3170 {
3171         struct net *net = sock_net(sk);
3172         struct xfrm_policy *xp;
3173         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3174         struct sadb_x_sec_ctx *sec_ctx;
3175 
3176         switch (sk->sk_family) {
3177         case AF_INET:
3178                 if (opt != IP_IPSEC_POLICY) {
3179                         *dir = -EOPNOTSUPP;
3180                         return NULL;
3181                 }
3182                 break;
3183 #if IS_ENABLED(CONFIG_IPV6)
3184         case AF_INET6:
3185                 if (opt != IPV6_IPSEC_POLICY) {
3186                         *dir = -EOPNOTSUPP;
3187                         return NULL;
3188                 }
3189                 break;
3190 #endif
3191         default:
3192                 *dir = -EINVAL;
3193                 return NULL;
3194         }
3195 
3196         *dir = -EINVAL;
3197 
3198         if (len < sizeof(struct sadb_x_policy) ||
3199             pol->sadb_x_policy_len*8 > len ||
3200             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3201             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3202                 return NULL;
3203 
3204         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3205         if (xp == NULL) {
3206                 *dir = -ENOBUFS;
3207                 return NULL;
3208         }
3209 
3210         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3211                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3212 
3213         xp->lft.soft_byte_limit = XFRM_INF;
3214         xp->lft.hard_byte_limit = XFRM_INF;
3215         xp->lft.soft_packet_limit = XFRM_INF;
3216         xp->lft.hard_packet_limit = XFRM_INF;
3217         xp->family = sk->sk_family;
3218 
3219         xp->xfrm_nr = 0;
3220         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3221             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3222                 goto out;
3223 
3224         /* security context too */
3225         if (len >= (pol->sadb_x_policy_len*8 +
3226             sizeof(struct sadb_x_sec_ctx))) {
3227                 char *p = (char *)pol;
3228                 struct xfrm_user_sec_ctx *uctx;
3229 
3230                 p += pol->sadb_x_policy_len*8;
3231                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3232                 if (len < pol->sadb_x_policy_len*8 +
3233                     sec_ctx->sadb_x_sec_len) {
3234                         *dir = -EINVAL;
3235                         goto out;
3236                 }
3237                 if ((*dir = verify_sec_ctx_len(p)))
3238                         goto out;
3239                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3240                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3241                 kfree(uctx);
3242 
3243                 if (*dir)
3244                         goto out;
3245         }
3246 
3247         *dir = pol->sadb_x_policy_dir-1;
3248         return xp;
3249 
3250 out:
3251         xp->walk.dead = 1;
3252         xfrm_policy_destroy(xp);
3253         return NULL;
3254 }
3255 
3256 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3257 {
3258         struct sk_buff *skb;
3259         struct sadb_msg *hdr;
3260         struct sadb_sa *sa;
3261         struct sadb_address *addr;
3262         struct sadb_x_nat_t_port *n_port;
3263         int sockaddr_size;
3264         int size;
3265         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3266         struct xfrm_encap_tmpl *natt = NULL;
3267 
3268         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3269         if (!sockaddr_size)
3270                 return -EINVAL;
3271 
3272         if (!satype)
3273                 return -EINVAL;
3274 
3275         if (!x->encap)
3276                 return -EINVAL;
3277 
3278         natt = x->encap;
3279 
3280         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3281          *
3282          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3283          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3284          */
3285 
3286         size = sizeof(struct sadb_msg) +
3287                 sizeof(struct sadb_sa) +
3288                 (sizeof(struct sadb_address) * 2) +
3289                 (sockaddr_size * 2) +
3290                 (sizeof(struct sadb_x_nat_t_port) * 2);
3291 
3292         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3293         if (skb == NULL)
3294                 return -ENOMEM;
3295 
3296         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3297         hdr->sadb_msg_version = PF_KEY_V2;
3298         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3299         hdr->sadb_msg_satype = satype;
3300         hdr->sadb_msg_len = size / sizeof(uint64_t);
3301         hdr->sadb_msg_errno = 0;
3302         hdr->sadb_msg_reserved = 0;
3303         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3304         hdr->sadb_msg_pid = 0;
3305 
3306         /* SA */
3307         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3308         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3309         sa->sadb_sa_exttype = SADB_EXT_SA;
3310         sa->sadb_sa_spi = x->id.spi;
3311         sa->sadb_sa_replay = 0;
3312         sa->sadb_sa_state = 0;
3313         sa->sadb_sa_auth = 0;
3314         sa->sadb_sa_encrypt = 0;
3315         sa->sadb_sa_flags = 0;
3316 
3317         /* ADDRESS_SRC (old addr) */
3318         addr = (struct sadb_address*)
3319                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3320         addr->sadb_address_len =
3321                 (sizeof(struct sadb_address)+sockaddr_size)/
3322                         sizeof(uint64_t);
3323         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3324         addr->sadb_address_proto = 0;
3325         addr->sadb_address_reserved = 0;
3326         addr->sadb_address_prefixlen =
3327                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3328                                     (struct sockaddr *) (addr + 1),
3329                                     x->props.family);
3330         if (!addr->sadb_address_prefixlen)
3331                 BUG();
3332 
3333         /* NAT_T_SPORT (old port) */
3334         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3335         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3336         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3337         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3338         n_port->sadb_x_nat_t_port_reserved = 0;
3339 
3340         /* ADDRESS_DST (new addr) */
3341         addr = (struct sadb_address*)
3342                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3343         addr->sadb_address_len =
3344                 (sizeof(struct sadb_address)+sockaddr_size)/
3345                         sizeof(uint64_t);
3346         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3347         addr->sadb_address_proto = 0;
3348         addr->sadb_address_reserved = 0;
3349         addr->sadb_address_prefixlen =
3350                 pfkey_sockaddr_fill(ipaddr, 0,
3351                                     (struct sockaddr *) (addr + 1),
3352                                     x->props.family);
3353         if (!addr->sadb_address_prefixlen)
3354                 BUG();
3355 
3356         /* NAT_T_DPORT (new port) */
3357         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3358         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3359         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3360         n_port->sadb_x_nat_t_port_port = sport;
3361         n_port->sadb_x_nat_t_port_reserved = 0;
3362 
3363         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3364 }
3365 
3366 #ifdef CONFIG_NET_KEY_MIGRATE
3367 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3368                             const struct xfrm_selector *sel)
3369 {
3370         struct sadb_address *addr;
3371         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3372         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3373         addr->sadb_address_exttype = type;
3374         addr->sadb_address_proto = sel->proto;
3375         addr->sadb_address_reserved = 0;
3376 
3377         switch (type) {
3378         case SADB_EXT_ADDRESS_SRC:
3379                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3380                 pfkey_sockaddr_fill(&sel->saddr, 0,
3381                                     (struct sockaddr *)(addr + 1),
3382                                     sel->family);
3383                 break;
3384         case SADB_EXT_ADDRESS_DST:
3385                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3386                 pfkey_sockaddr_fill(&sel->daddr, 0,
3387                                     (struct sockaddr *)(addr + 1),
3388                                     sel->family);
3389                 break;
3390         default:
3391                 return -EINVAL;
3392         }
3393 
3394         return 0;
3395 }
3396 
3397 
3398 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3399 {
3400         struct sadb_x_kmaddress *kma;
3401         u8 *sa;
3402         int family = k->family;
3403         int socklen = pfkey_sockaddr_len(family);
3404         int size_req;
3405 
3406         size_req = (sizeof(struct sadb_x_kmaddress) +
3407                     pfkey_sockaddr_pair_size(family));
3408 
3409         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3410         memset(kma, 0, size_req);
3411         kma->sadb_x_kmaddress_len = size_req / 8;
3412         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3413         kma->sadb_x_kmaddress_reserved = k->reserved;
3414 
3415         sa = (u8 *)(kma + 1);
3416         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3417             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3418                 return -EINVAL;
3419 
3420         return 0;
3421 }
3422 
3423 static int set_ipsecrequest(struct sk_buff *skb,
3424                             uint8_t proto, uint8_t mode, int level,
3425                             uint32_t reqid, uint8_t family,
3426                             const xfrm_address_t *src, const xfrm_address_t *dst)
3427 {
3428         struct sadb_x_ipsecrequest *rq;
3429         u8 *sa;
3430         int socklen = pfkey_sockaddr_len(family);
3431         int size_req;
3432 
3433         size_req = sizeof(struct sadb_x_ipsecrequest) +
3434                    pfkey_sockaddr_pair_size(family);
3435 
3436         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3437         memset(rq, 0, size_req);
3438         rq->sadb_x_ipsecrequest_len = size_req;
3439         rq->sadb_x_ipsecrequest_proto = proto;
3440         rq->sadb_x_ipsecrequest_mode = mode;
3441         rq->sadb_x_ipsecrequest_level = level;
3442         rq->sadb_x_ipsecrequest_reqid = reqid;
3443 
3444         sa = (u8 *) (rq + 1);
3445         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3446             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3447                 return -EINVAL;
3448 
3449         return 0;
3450 }
3451 #endif
3452 
3453 #ifdef CONFIG_NET_KEY_MIGRATE
3454 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3455                               const struct xfrm_migrate *m, int num_bundles,
3456                               const struct xfrm_kmaddress *k)
3457 {
3458         int i;
3459         int sasize_sel;
3460         int size = 0;
3461         int size_pol = 0;
3462         struct sk_buff *skb;
3463         struct sadb_msg *hdr;
3464         struct sadb_x_policy *pol;
3465         const struct xfrm_migrate *mp;
3466 
3467         if (type != XFRM_POLICY_TYPE_MAIN)
3468                 return 0;
3469 
3470         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3471                 return -EINVAL;
3472 
3473         if (k != NULL) {
3474                 /* addresses for KM */
3475                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3476                                      pfkey_sockaddr_pair_size(k->family));
3477         }
3478 
3479         /* selector */
3480         sasize_sel = pfkey_sockaddr_size(sel->family);
3481         if (!sasize_sel)
3482                 return -EINVAL;
3483         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3484 
3485         /* policy info */
3486         size_pol += sizeof(struct sadb_x_policy);
3487 
3488         /* ipsecrequests */
3489         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3490                 /* old locator pair */
3491                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3492                             pfkey_sockaddr_pair_size(mp->old_family);
3493                 /* new locator pair */
3494                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3495                             pfkey_sockaddr_pair_size(mp->new_family);
3496         }
3497 
3498         size += sizeof(struct sadb_msg) + size_pol;
3499 
3500         /* alloc buffer */
3501         skb = alloc_skb(size, GFP_ATOMIC);
3502         if (skb == NULL)
3503                 return -ENOMEM;
3504 
3505         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3506         hdr->sadb_msg_version = PF_KEY_V2;
3507         hdr->sadb_msg_type = SADB_X_MIGRATE;
3508         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3509         hdr->sadb_msg_len = size / 8;
3510         hdr->sadb_msg_errno = 0;
3511         hdr->sadb_msg_reserved = 0;
3512         hdr->sadb_msg_seq = 0;
3513         hdr->sadb_msg_pid = 0;
3514 
3515         /* Addresses to be used by KM for negotiation, if ext is available */
3516         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3517                 goto err;
3518 
3519         /* selector src */
3520         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3521 
3522         /* selector dst */
3523         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3524 
3525         /* policy information */
3526         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3527         pol->sadb_x_policy_len = size_pol / 8;
3528         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3529         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3530         pol->sadb_x_policy_dir = dir + 1;
3531         pol->sadb_x_policy_reserved = 0;
3532         pol->sadb_x_policy_id = 0;
3533         pol->sadb_x_policy_priority = 0;
3534 
3535         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3536                 /* old ipsecrequest */
3537                 int mode = pfkey_mode_from_xfrm(mp->mode);
3538                 if (mode < 0)
3539                         goto err;
3540                 if (set_ipsecrequest(skb, mp->proto, mode,
3541                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3542                                      mp->reqid, mp->old_family,
3543                                      &mp->old_saddr, &mp->old_daddr) < 0)
3544                         goto err;
3545 
3546                 /* new ipsecrequest */
3547                 if (set_ipsecrequest(skb, mp->proto, mode,
3548                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3549                                      mp->reqid, mp->new_family,
3550                                      &mp->new_saddr, &mp->new_daddr) < 0)
3551                         goto err;
3552         }
3553 
3554         /* broadcast migrate message to sockets */
3555         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3556 
3557         return 0;
3558 
3559 err:
3560         kfree_skb(skb);
3561         return -EINVAL;
3562 }
3563 #else
3564 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3565                               const struct xfrm_migrate *m, int num_bundles,
3566                               const struct xfrm_kmaddress *k)
3567 {
3568         return -ENOPROTOOPT;
3569 }
3570 #endif
3571 
3572 static int pfkey_sendmsg(struct kiocb *kiocb,
3573                          struct socket *sock, struct msghdr *msg, size_t len)
3574 {
3575         struct sock *sk = sock->sk;
3576         struct sk_buff *skb = NULL;
3577         struct sadb_msg *hdr = NULL;
3578         int err;
3579 
3580         err = -EOPNOTSUPP;
3581         if (msg->msg_flags & MSG_OOB)
3582                 goto out;
3583 
3584         err = -EMSGSIZE;
3585         if ((unsigned int)len > sk->sk_sndbuf - 32)
3586                 goto out;
3587 
3588         err = -ENOBUFS;
3589         skb = alloc_skb(len, GFP_KERNEL);
3590         if (skb == NULL)
3591                 goto out;
3592 
3593         err = -EFAULT;
3594         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3595                 goto out;
3596 
3597         hdr = pfkey_get_base_msg(skb, &err);
3598         if (!hdr)
3599                 goto out;
3600 
3601         mutex_lock(&xfrm_cfg_mutex);
3602         err = pfkey_process(sk, skb, hdr);
3603         mutex_unlock(&xfrm_cfg_mutex);
3604 
3605 out:
3606         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3607                 err = 0;
3608         kfree_skb(skb);
3609 
3610         return err ? : len;
3611 }
3612 
3613 static int pfkey_recvmsg(struct kiocb *kiocb,
3614                          struct socket *sock, struct msghdr *msg, size_t len,
3615                          int flags)
3616 {
3617         struct sock *sk = sock->sk;
3618         struct pfkey_sock *pfk = pfkey_sk(sk);
3619         struct sk_buff *skb;
3620         int copied, err;
3621 
3622         err = -EINVAL;
3623         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3624                 goto out;
3625 
3626         msg->msg_namelen = 0;
3627         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3628         if (skb == NULL)
3629                 goto out;
3630 
3631         copied = skb->len;
3632         if (copied > len) {
3633                 msg->msg_flags |= MSG_TRUNC;
3634                 copied = len;
3635         }
3636 
3637         skb_reset_transport_header(skb);
3638         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3639         if (err)
3640                 goto out_free;
3641 
3642         sock_recv_ts_and_drops(msg, sk, skb);
3643 
3644         err = (flags & MSG_TRUNC) ? skb->len : copied;
3645 
3646         if (pfk->dump.dump != NULL &&
3647             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3648                 pfkey_do_dump(pfk);
3649 
3650 out_free:
3651         skb_free_datagram(sk, skb);
3652 out:
3653         return err;
3654 }
3655 
3656 static const struct proto_ops pfkey_ops = {
3657         .family         =       PF_KEY,
3658         .owner          =       THIS_MODULE,
3659         /* Operations that make no sense on pfkey sockets. */
3660         .bind           =       sock_no_bind,
3661         .connect        =       sock_no_connect,
3662         .socketpair     =       sock_no_socketpair,
3663         .accept         =       sock_no_accept,
3664         .getname        =       sock_no_getname,
3665         .ioctl          =       sock_no_ioctl,
3666         .listen         =       sock_no_listen,
3667         .shutdown       =       sock_no_shutdown,
3668         .setsockopt     =       sock_no_setsockopt,
3669         .getsockopt     =       sock_no_getsockopt,
3670         .mmap           =       sock_no_mmap,
3671         .sendpage       =       sock_no_sendpage,
3672 
3673         /* Now the operations that really occur. */
3674         .release        =       pfkey_release,
3675         .poll           =       datagram_poll,
3676         .sendmsg        =       pfkey_sendmsg,
3677         .recvmsg        =       pfkey_recvmsg,
3678 };
3679 
3680 static const struct net_proto_family pfkey_family_ops = {
3681         .family =       PF_KEY,
3682         .create =       pfkey_create,
3683         .owner  =       THIS_MODULE,
3684 };
3685 
3686 #ifdef CONFIG_PROC_FS
3687 static int pfkey_seq_show(struct seq_file *f, void *v)
3688 {
3689         struct sock *s = sk_entry(v);
3690 
3691         if (v == SEQ_START_TOKEN)
3692                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3693         else
3694                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3695                                s,
3696                                atomic_read(&s->sk_refcnt),
3697                                sk_rmem_alloc_get(s),
3698                                sk_wmem_alloc_get(s),
3699                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3700                                sock_i_ino(s)
3701                                );
3702         return 0;
3703 }
3704 
3705 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3706         __acquires(rcu)
3707 {
3708         struct net *net = seq_file_net(f);
3709         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3710 
3711         rcu_read_lock();
3712         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3713 }
3714 
3715 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3716 {
3717         struct net *net = seq_file_net(f);
3718         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3719 
3720         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3721 }
3722 
3723 static void pfkey_seq_stop(struct seq_file *f, void *v)
3724         __releases(rcu)
3725 {
3726         rcu_read_unlock();
3727 }
3728 
3729 static const struct seq_operations pfkey_seq_ops = {
3730         .start  = pfkey_seq_start,
3731         .next   = pfkey_seq_next,
3732         .stop   = pfkey_seq_stop,
3733         .show   = pfkey_seq_show,
3734 };
3735 
3736 static int pfkey_seq_open(struct inode *inode, struct file *file)
3737 {
3738         return seq_open_net(inode, file, &pfkey_seq_ops,
3739                             sizeof(struct seq_net_private));
3740 }
3741 
3742 static const struct file_operations pfkey_proc_ops = {
3743         .open    = pfkey_seq_open,
3744         .read    = seq_read,
3745         .llseek  = seq_lseek,
3746         .release = seq_release_net,
3747 };
3748 
3749 static int __net_init pfkey_init_proc(struct net *net)
3750 {
3751         struct proc_dir_entry *e;
3752 
3753         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3754         if (e == NULL)
3755                 return -ENOMEM;
3756 
3757         return 0;
3758 }
3759 
3760 static void __net_exit pfkey_exit_proc(struct net *net)
3761 {
3762         remove_proc_entry("pfkey", net->proc_net);
3763 }
3764 #else
3765 static inline int pfkey_init_proc(struct net *net)
3766 {
3767         return 0;
3768 }
3769 
3770 static inline void pfkey_exit_proc(struct net *net)
3771 {
3772 }
3773 #endif
3774 
3775 static struct xfrm_mgr pfkeyv2_mgr =
3776 {
3777         .id             = "pfkeyv2",
3778         .notify         = pfkey_send_notify,
3779         .acquire        = pfkey_send_acquire,
3780         .compile_policy = pfkey_compile_policy,
3781         .new_mapping    = pfkey_send_new_mapping,
3782         .notify_policy  = pfkey_send_policy_notify,
3783         .migrate        = pfkey_send_migrate,
3784 };
3785 
3786 static int __net_init pfkey_net_init(struct net *net)
3787 {
3788         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3789         int rv;
3790 
3791         INIT_HLIST_HEAD(&net_pfkey->table);
3792         atomic_set(&net_pfkey->socks_nr, 0);
3793 
3794         rv = pfkey_init_proc(net);
3795 
3796         return rv;
3797 }
3798 
3799 static void __net_exit pfkey_net_exit(struct net *net)
3800 {
3801         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3802 
3803         pfkey_exit_proc(net);
3804         BUG_ON(!hlist_empty(&net_pfkey->table));
3805 }
3806 
3807 static struct pernet_operations pfkey_net_ops = {
3808         .init = pfkey_net_init,
3809         .exit = pfkey_net_exit,
3810         .id   = &pfkey_net_id,
3811         .size = sizeof(struct netns_pfkey),
3812 };
3813 
3814 static void __exit ipsec_pfkey_exit(void)
3815 {
3816         xfrm_unregister_km(&pfkeyv2_mgr);
3817         sock_unregister(PF_KEY);
3818         unregister_pernet_subsys(&pfkey_net_ops);
3819         proto_unregister(&key_proto);
3820 }
3821 
3822 static int __init ipsec_pfkey_init(void)
3823 {
3824         int err = proto_register(&key_proto, 0);
3825 
3826         if (err != 0)
3827                 goto out;
3828 
3829         err = register_pernet_subsys(&pfkey_net_ops);
3830         if (err != 0)
3831                 goto out_unregister_key_proto;
3832         err = sock_register(&pfkey_family_ops);
3833         if (err != 0)
3834                 goto out_unregister_pernet;
3835         err = xfrm_register_km(&pfkeyv2_mgr);
3836         if (err != 0)
3837                 goto out_sock_unregister;
3838 out:
3839         return err;
3840 
3841 out_sock_unregister:
3842         sock_unregister(PF_KEY);
3843 out_unregister_pernet:
3844         unregister_pernet_subsys(&pfkey_net_ops);
3845 out_unregister_key_proto:
3846         proto_unregister(&key_proto);
3847         goto out;
3848 }
3849 
3850 module_init(ipsec_pfkey_init);
3851 module_exit(ipsec_pfkey_exit);
3852 MODULE_LICENSE("GPL");
3853 MODULE_ALIAS_NETPROTO(PF_KEY);
3854 

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