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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 unsigned 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 const 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, kern);
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);
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,
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, GFP_ATOMIC, 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, GFP_ATOMIC, sk);
263 
264                 /* Error is cleared after successful 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, GFP_KERNEL, 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, 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, BROADCAST_ONE, sk, sock_net(sk));
337 
338         return 0;
339 }
340 
341 static const 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         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
369 };
370 
371 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
372 static int verify_address_len(const void *p)
373 {
374         const struct sadb_address *sp = p;
375         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
376         const struct sockaddr_in *sin;
377 #if IS_ENABLED(CONFIG_IPV6)
378         const struct sockaddr_in6 *sin6;
379 #endif
380         int len;
381 
382         switch (addr->sa_family) {
383         case AF_INET:
384                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
385                 if (sp->sadb_address_len != len ||
386                     sp->sadb_address_prefixlen > 32)
387                         return -EINVAL;
388                 break;
389 #if IS_ENABLED(CONFIG_IPV6)
390         case AF_INET6:
391                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
392                 if (sp->sadb_address_len != len ||
393                     sp->sadb_address_prefixlen > 128)
394                         return -EINVAL;
395                 break;
396 #endif
397         default:
398                 /* It is user using kernel to keep track of security
399                  * associations for another protocol, such as
400                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
401                  * lengths.
402                  *
403                  * XXX Actually, association/policy database is not yet
404                  * XXX able to cope with arbitrary sockaddr families.
405                  * XXX When it can, remove this -EINVAL.  -DaveM
406                  */
407                 return -EINVAL;
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                                                                      gfp_t gfp)
438 {
439         struct xfrm_user_sec_ctx *uctx = NULL;
440         int ctx_size = sec_ctx->sadb_x_ctx_len;
441 
442         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
443 
444         if (!uctx)
445                 return NULL;
446 
447         uctx->len = pfkey_sec_ctx_len(sec_ctx);
448         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
449         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
450         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
451         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
452         memcpy(uctx + 1, sec_ctx + 1,
453                uctx->ctx_len);
454 
455         return uctx;
456 }
457 
458 static int present_and_same_family(const struct sadb_address *src,
459                                    const struct sadb_address *dst)
460 {
461         const struct sockaddr *s_addr, *d_addr;
462 
463         if (!src || !dst)
464                 return 0;
465 
466         s_addr = (const struct sockaddr *)(src + 1);
467         d_addr = (const struct sockaddr *)(dst + 1);
468         if (s_addr->sa_family != d_addr->sa_family)
469                 return 0;
470         if (s_addr->sa_family != AF_INET
471 #if IS_ENABLED(CONFIG_IPV6)
472             && s_addr->sa_family != AF_INET6
473 #endif
474                 )
475                 return 0;
476 
477         return 1;
478 }
479 
480 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
481 {
482         const char *p = (char *) hdr;
483         int len = skb->len;
484 
485         len -= sizeof(*hdr);
486         p += sizeof(*hdr);
487         while (len > 0) {
488                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
489                 uint16_t ext_type;
490                 int ext_len;
491 
492                 ext_len  = ehdr->sadb_ext_len;
493                 ext_len *= sizeof(uint64_t);
494                 ext_type = ehdr->sadb_ext_type;
495                 if (ext_len < sizeof(uint64_t) ||
496                     ext_len > len ||
497                     ext_type == SADB_EXT_RESERVED)
498                         return -EINVAL;
499 
500                 if (ext_type <= SADB_EXT_MAX) {
501                         int min = (int) sadb_ext_min_len[ext_type];
502                         if (ext_len < min)
503                                 return -EINVAL;
504                         if (ext_hdrs[ext_type-1] != NULL)
505                                 return -EINVAL;
506                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
507                             ext_type == SADB_EXT_ADDRESS_DST ||
508                             ext_type == SADB_EXT_ADDRESS_PROXY ||
509                             ext_type == SADB_X_EXT_NAT_T_OA) {
510                                 if (verify_address_len(p))
511                                         return -EINVAL;
512                         }
513                         if (ext_type == SADB_X_EXT_SEC_CTX) {
514                                 if (verify_sec_ctx_len(p))
515                                         return -EINVAL;
516                         }
517                         ext_hdrs[ext_type-1] = (void *) p;
518                 }
519                 p   += ext_len;
520                 len -= ext_len;
521         }
522 
523         return 0;
524 }
525 
526 static uint16_t
527 pfkey_satype2proto(uint8_t satype)
528 {
529         switch (satype) {
530         case SADB_SATYPE_UNSPEC:
531                 return IPSEC_PROTO_ANY;
532         case SADB_SATYPE_AH:
533                 return IPPROTO_AH;
534         case SADB_SATYPE_ESP:
535                 return IPPROTO_ESP;
536         case SADB_X_SATYPE_IPCOMP:
537                 return IPPROTO_COMP;
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         default:
555                 return 0;
556         }
557         /* NOTREACHED */
558 }
559 
560 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
561  * say specifically 'just raw sockets' as we encode them as 255.
562  */
563 
564 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
565 {
566         return proto == IPSEC_PROTO_ANY ? 0 : proto;
567 }
568 
569 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
570 {
571         return proto ? proto : IPSEC_PROTO_ANY;
572 }
573 
574 static inline int pfkey_sockaddr_len(sa_family_t family)
575 {
576         switch (family) {
577         case AF_INET:
578                 return sizeof(struct sockaddr_in);
579 #if IS_ENABLED(CONFIG_IPV6)
580         case AF_INET6:
581                 return sizeof(struct sockaddr_in6);
582 #endif
583         }
584         return 0;
585 }
586 
587 static
588 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
589 {
590         switch (sa->sa_family) {
591         case AF_INET:
592                 xaddr->a4 =
593                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
594                 return AF_INET;
595 #if IS_ENABLED(CONFIG_IPV6)
596         case AF_INET6:
597                 memcpy(xaddr->a6,
598                        &((struct sockaddr_in6 *)sa)->sin6_addr,
599                        sizeof(struct in6_addr));
600                 return AF_INET6;
601 #endif
602         }
603         return 0;
604 }
605 
606 static
607 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
608 {
609         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
610                                       xaddr);
611 }
612 
613 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
614 {
615         const struct sadb_sa *sa;
616         const struct sadb_address *addr;
617         uint16_t proto;
618         unsigned short family;
619         xfrm_address_t *xaddr;
620 
621         sa = ext_hdrs[SADB_EXT_SA - 1];
622         if (sa == NULL)
623                 return NULL;
624 
625         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
626         if (proto == 0)
627                 return NULL;
628 
629         /* sadb_address_len should be checked by caller */
630         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
631         if (addr == NULL)
632                 return NULL;
633 
634         family = ((const struct sockaddr *)(addr + 1))->sa_family;
635         switch (family) {
636         case AF_INET:
637                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
638                 break;
639 #if IS_ENABLED(CONFIG_IPV6)
640         case AF_INET6:
641                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
642                 break;
643 #endif
644         default:
645                 xaddr = NULL;
646         }
647 
648         if (!xaddr)
649                 return NULL;
650 
651         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
652 }
653 
654 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
655 
656 static int
657 pfkey_sockaddr_size(sa_family_t family)
658 {
659         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
660 }
661 
662 static inline int pfkey_mode_from_xfrm(int mode)
663 {
664         switch(mode) {
665         case XFRM_MODE_TRANSPORT:
666                 return IPSEC_MODE_TRANSPORT;
667         case XFRM_MODE_TUNNEL:
668                 return IPSEC_MODE_TUNNEL;
669         case XFRM_MODE_BEET:
670                 return IPSEC_MODE_BEET;
671         default:
672                 return -1;
673         }
674 }
675 
676 static inline int pfkey_mode_to_xfrm(int mode)
677 {
678         switch(mode) {
679         case IPSEC_MODE_ANY:    /*XXX*/
680         case IPSEC_MODE_TRANSPORT:
681                 return XFRM_MODE_TRANSPORT;
682         case IPSEC_MODE_TUNNEL:
683                 return XFRM_MODE_TUNNEL;
684         case IPSEC_MODE_BEET:
685                 return XFRM_MODE_BEET;
686         default:
687                 return -1;
688         }
689 }
690 
691 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
692                                         struct sockaddr *sa,
693                                         unsigned short family)
694 {
695         switch (family) {
696         case AF_INET:
697             {
698                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
699                 sin->sin_family = AF_INET;
700                 sin->sin_port = port;
701                 sin->sin_addr.s_addr = xaddr->a4;
702                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
703                 return 32;
704             }
705 #if IS_ENABLED(CONFIG_IPV6)
706         case AF_INET6:
707             {
708                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
709                 sin6->sin6_family = AF_INET6;
710                 sin6->sin6_port = port;
711                 sin6->sin6_flowinfo = 0;
712                 sin6->sin6_addr = xaddr->in6;
713                 sin6->sin6_scope_id = 0;
714                 return 128;
715             }
716 #endif
717         }
718         return 0;
719 }
720 
721 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
722                                               int add_keys, int hsc)
723 {
724         struct sk_buff *skb;
725         struct sadb_msg *hdr;
726         struct sadb_sa *sa;
727         struct sadb_lifetime *lifetime;
728         struct sadb_address *addr;
729         struct sadb_key *key;
730         struct sadb_x_sa2 *sa2;
731         struct sadb_x_sec_ctx *sec_ctx;
732         struct xfrm_sec_ctx *xfrm_ctx;
733         int ctx_size = 0;
734         int size;
735         int auth_key_size = 0;
736         int encrypt_key_size = 0;
737         int sockaddr_size;
738         struct xfrm_encap_tmpl *natt = NULL;
739         int mode;
740 
741         /* address family check */
742         sockaddr_size = pfkey_sockaddr_size(x->props.family);
743         if (!sockaddr_size)
744                 return ERR_PTR(-EINVAL);
745 
746         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
747            key(AE), (identity(SD),) (sensitivity)> */
748         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
749                 sizeof(struct sadb_lifetime) +
750                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
751                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
752                         sizeof(struct sadb_address)*2 +
753                                 sockaddr_size*2 +
754                                         sizeof(struct sadb_x_sa2);
755 
756         if ((xfrm_ctx = x->security)) {
757                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
758                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
759         }
760 
761         /* identity & sensitivity */
762         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
763                 size += sizeof(struct sadb_address) + sockaddr_size;
764 
765         if (add_keys) {
766                 if (x->aalg && x->aalg->alg_key_len) {
767                         auth_key_size =
768                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
769                         size += sizeof(struct sadb_key) + auth_key_size;
770                 }
771                 if (x->ealg && x->ealg->alg_key_len) {
772                         encrypt_key_size =
773                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
774                         size += sizeof(struct sadb_key) + encrypt_key_size;
775                 }
776         }
777         if (x->encap)
778                 natt = x->encap;
779 
780         if (natt && natt->encap_type) {
781                 size += sizeof(struct sadb_x_nat_t_type);
782                 size += sizeof(struct sadb_x_nat_t_port);
783                 size += sizeof(struct sadb_x_nat_t_port);
784         }
785 
786         skb =  alloc_skb(size + 16, GFP_ATOMIC);
787         if (skb == NULL)
788                 return ERR_PTR(-ENOBUFS);
789 
790         /* call should fill header later */
791         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
792         memset(hdr, 0, size);   /* XXX do we need this ? */
793         hdr->sadb_msg_len = size / sizeof(uint64_t);
794 
795         /* sa */
796         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
797         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
798         sa->sadb_sa_exttype = SADB_EXT_SA;
799         sa->sadb_sa_spi = x->id.spi;
800         sa->sadb_sa_replay = x->props.replay_window;
801         switch (x->km.state) {
802         case XFRM_STATE_VALID:
803                 sa->sadb_sa_state = x->km.dying ?
804                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
805                 break;
806         case XFRM_STATE_ACQ:
807                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
808                 break;
809         default:
810                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
811                 break;
812         }
813         sa->sadb_sa_auth = 0;
814         if (x->aalg) {
815                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
816                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
817                                         a->desc.sadb_alg_id : 0;
818         }
819         sa->sadb_sa_encrypt = 0;
820         BUG_ON(x->ealg && x->calg);
821         if (x->ealg) {
822                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
823                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
824                                         a->desc.sadb_alg_id : 0;
825         }
826         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
827         if (x->calg) {
828                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
829                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
830                                         a->desc.sadb_alg_id : 0;
831         }
832 
833         sa->sadb_sa_flags = 0;
834         if (x->props.flags & XFRM_STATE_NOECN)
835                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
836         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
837                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
838         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
839                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
840 
841         /* hard time */
842         if (hsc & 2) {
843                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
844                                                              sizeof(struct sadb_lifetime));
845                 lifetime->sadb_lifetime_len =
846                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
847                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
848                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
849                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
850                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
851                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
852         }
853         /* soft time */
854         if (hsc & 1) {
855                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
856                                                              sizeof(struct sadb_lifetime));
857                 lifetime->sadb_lifetime_len =
858                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
859                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
860                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
861                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
862                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
863                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
864         }
865         /* current time */
866         lifetime = (struct sadb_lifetime *)  skb_put(skb,
867                                                      sizeof(struct sadb_lifetime));
868         lifetime->sadb_lifetime_len =
869                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
870         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
871         lifetime->sadb_lifetime_allocations = x->curlft.packets;
872         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
873         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
874         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
875         /* src address */
876         addr = (struct sadb_address*) skb_put(skb,
877                                               sizeof(struct sadb_address)+sockaddr_size);
878         addr->sadb_address_len =
879                 (sizeof(struct sadb_address)+sockaddr_size)/
880                         sizeof(uint64_t);
881         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
882         /* "if the ports are non-zero, then the sadb_address_proto field,
883            normally zero, MUST be filled in with the transport
884            protocol's number." - RFC2367 */
885         addr->sadb_address_proto = 0;
886         addr->sadb_address_reserved = 0;
887 
888         addr->sadb_address_prefixlen =
889                 pfkey_sockaddr_fill(&x->props.saddr, 0,
890                                     (struct sockaddr *) (addr + 1),
891                                     x->props.family);
892         if (!addr->sadb_address_prefixlen)
893                 BUG();
894 
895         /* dst address */
896         addr = (struct sadb_address*) skb_put(skb,
897                                               sizeof(struct sadb_address)+sockaddr_size);
898         addr->sadb_address_len =
899                 (sizeof(struct sadb_address)+sockaddr_size)/
900                         sizeof(uint64_t);
901         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
902         addr->sadb_address_proto = 0;
903         addr->sadb_address_reserved = 0;
904 
905         addr->sadb_address_prefixlen =
906                 pfkey_sockaddr_fill(&x->id.daddr, 0,
907                                     (struct sockaddr *) (addr + 1),
908                                     x->props.family);
909         if (!addr->sadb_address_prefixlen)
910                 BUG();
911 
912         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
913                              x->props.family)) {
914                 addr = (struct sadb_address*) skb_put(skb,
915                         sizeof(struct sadb_address)+sockaddr_size);
916                 addr->sadb_address_len =
917                         (sizeof(struct sadb_address)+sockaddr_size)/
918                         sizeof(uint64_t);
919                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
920                 addr->sadb_address_proto =
921                         pfkey_proto_from_xfrm(x->sel.proto);
922                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
923                 addr->sadb_address_reserved = 0;
924 
925                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
926                                     (struct sockaddr *) (addr + 1),
927                                     x->props.family);
928         }
929 
930         /* auth key */
931         if (add_keys && auth_key_size) {
932                 key = (struct sadb_key *) skb_put(skb,
933                                                   sizeof(struct sadb_key)+auth_key_size);
934                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
935                         sizeof(uint64_t);
936                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
937                 key->sadb_key_bits = x->aalg->alg_key_len;
938                 key->sadb_key_reserved = 0;
939                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
940         }
941         /* encrypt key */
942         if (add_keys && encrypt_key_size) {
943                 key = (struct sadb_key *) skb_put(skb,
944                                                   sizeof(struct sadb_key)+encrypt_key_size);
945                 key->sadb_key_len = (sizeof(struct sadb_key) +
946                                      encrypt_key_size) / sizeof(uint64_t);
947                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
948                 key->sadb_key_bits = x->ealg->alg_key_len;
949                 key->sadb_key_reserved = 0;
950                 memcpy(key + 1, x->ealg->alg_key,
951                        (x->ealg->alg_key_len+7)/8);
952         }
953 
954         /* sa */
955         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
956         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
957         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
958         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
959                 kfree_skb(skb);
960                 return ERR_PTR(-EINVAL);
961         }
962         sa2->sadb_x_sa2_mode = mode;
963         sa2->sadb_x_sa2_reserved1 = 0;
964         sa2->sadb_x_sa2_reserved2 = 0;
965         sa2->sadb_x_sa2_sequence = 0;
966         sa2->sadb_x_sa2_reqid = x->props.reqid;
967 
968         if (natt && natt->encap_type) {
969                 struct sadb_x_nat_t_type *n_type;
970                 struct sadb_x_nat_t_port *n_port;
971 
972                 /* type */
973                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
974                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
975                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
976                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
977                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
978                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
979                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
980 
981                 /* source port */
982                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
983                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
984                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
985                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
986                 n_port->sadb_x_nat_t_port_reserved = 0;
987 
988                 /* dest port */
989                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
990                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
991                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
992                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
993                 n_port->sadb_x_nat_t_port_reserved = 0;
994         }
995 
996         /* security context */
997         if (xfrm_ctx) {
998                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
999                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1000                 sec_ctx->sadb_x_sec_len =
1001                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1002                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1003                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1004                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1005                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1006                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1007                        xfrm_ctx->ctx_len);
1008         }
1009 
1010         return skb;
1011 }
1012 
1013 
1014 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1015 {
1016         struct sk_buff *skb;
1017 
1018         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1019 
1020         return skb;
1021 }
1022 
1023 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1024                                                           int hsc)
1025 {
1026         return __pfkey_xfrm_state2msg(x, 0, hsc);
1027 }
1028 
1029 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1030                                                 const struct sadb_msg *hdr,
1031                                                 void * const *ext_hdrs)
1032 {
1033         struct xfrm_state *x;
1034         const struct sadb_lifetime *lifetime;
1035         const struct sadb_sa *sa;
1036         const struct sadb_key *key;
1037         const struct sadb_x_sec_ctx *sec_ctx;
1038         uint16_t proto;
1039         int err;
1040 
1041 
1042         sa = ext_hdrs[SADB_EXT_SA - 1];
1043         if (!sa ||
1044             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1045                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1046                 return ERR_PTR(-EINVAL);
1047         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1048             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1049                 return ERR_PTR(-EINVAL);
1050         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1051             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1052                 return ERR_PTR(-EINVAL);
1053         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1054             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1055                 return ERR_PTR(-EINVAL);
1056 
1057         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1058         if (proto == 0)
1059                 return ERR_PTR(-EINVAL);
1060 
1061         /* default error is no buffer space */
1062         err = -ENOBUFS;
1063 
1064         /* RFC2367:
1065 
1066    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1067    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1068    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1069    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1070    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1071    not true.
1072 
1073            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1074            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1075          */
1076         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1077             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1078              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1079             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1080                 return ERR_PTR(-EINVAL);
1081         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1082         if (key != NULL &&
1083             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1084             ((key->sadb_key_bits+7) / 8 == 0 ||
1085              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1086                 return ERR_PTR(-EINVAL);
1087         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1088         if (key != NULL &&
1089             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1090             ((key->sadb_key_bits+7) / 8 == 0 ||
1091              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092                 return ERR_PTR(-EINVAL);
1093 
1094         x = xfrm_state_alloc(net);
1095         if (x == NULL)
1096                 return ERR_PTR(-ENOBUFS);
1097 
1098         x->id.proto = proto;
1099         x->id.spi = sa->sadb_sa_spi;
1100         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1101                                         (sizeof(x->replay.bitmap) * 8));
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, GFP_KERNEL);
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                         x->geniv = a->uinfo.encr.geniv;
1194                 }
1195         }
1196         /* x->algo.flags = sa->sadb_sa_flags; */
1197 
1198         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199                                                     &x->props.saddr);
1200         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201                                   &x->id.daddr);
1202 
1203         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206                 if (mode < 0) {
1207                         err = -EINVAL;
1208                         goto out;
1209                 }
1210                 x->props.mode = mode;
1211                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212         }
1213 
1214         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216 
1217                 /* Nobody uses this, but we try. */
1218                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220         }
1221 
1222         if (!x->sel.family)
1223                 x->sel.family = x->props.family;
1224 
1225         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226                 const struct sadb_x_nat_t_type* n_type;
1227                 struct xfrm_encap_tmpl *natt;
1228 
1229                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230                 if (!x->encap)
1231                         goto out;
1232 
1233                 natt = x->encap;
1234                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236 
1237                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238                         const struct sadb_x_nat_t_port *n_port =
1239                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241                 }
1242                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243                         const struct sadb_x_nat_t_port *n_port =
1244                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246                 }
1247                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248         }
1249 
1250         err = xfrm_init_state(x);
1251         if (err)
1252                 goto out;
1253 
1254         x->km.seq = hdr->sadb_msg_seq;
1255         return x;
1256 
1257 out:
1258         x->km.state = XFRM_STATE_DEAD;
1259         xfrm_state_put(x);
1260         return ERR_PTR(err);
1261 }
1262 
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265         return -EOPNOTSUPP;
1266 }
1267 
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270         struct net *net = sock_net(sk);
1271         struct sk_buff *resp_skb;
1272         struct sadb_x_sa2 *sa2;
1273         struct sadb_address *saddr, *daddr;
1274         struct sadb_msg *out_hdr;
1275         struct sadb_spirange *range;
1276         struct xfrm_state *x = NULL;
1277         int mode;
1278         int err;
1279         u32 min_spi, max_spi;
1280         u32 reqid;
1281         u8 proto;
1282         unsigned short family;
1283         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284 
1285         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287                 return -EINVAL;
1288 
1289         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290         if (proto == 0)
1291                 return -EINVAL;
1292 
1293         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295                 if (mode < 0)
1296                         return -EINVAL;
1297                 reqid = sa2->sadb_x_sa2_reqid;
1298         } else {
1299                 mode = 0;
1300                 reqid = 0;
1301         }
1302 
1303         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305 
1306         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307         switch (family) {
1308         case AF_INET:
1309                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311                 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313         case AF_INET6:
1314                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316                 break;
1317 #endif
1318         }
1319 
1320         if (hdr->sadb_msg_seq) {
1321                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323                         xfrm_state_put(x);
1324                         x = NULL;
1325                 }
1326         }
1327 
1328         if (!x)
1329                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330 
1331         if (x == NULL)
1332                 return -ENOENT;
1333 
1334         min_spi = 0x100;
1335         max_spi = 0x0fffffff;
1336 
1337         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338         if (range) {
1339                 min_spi = range->sadb_spirange_min;
1340                 max_spi = range->sadb_spirange_max;
1341         }
1342 
1343         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1344         if (err) {
1345                 xfrm_state_put(x);
1346                 return err;
1347         }
1348 
1349         err = xfrm_alloc_spi(x, min_spi, max_spi);
1350         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1351 
1352         if (IS_ERR(resp_skb)) {
1353                 xfrm_state_put(x);
1354                 return  PTR_ERR(resp_skb);
1355         }
1356 
1357         out_hdr = (struct sadb_msg *) resp_skb->data;
1358         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1359         out_hdr->sadb_msg_type = SADB_GETSPI;
1360         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1361         out_hdr->sadb_msg_errno = 0;
1362         out_hdr->sadb_msg_reserved = 0;
1363         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1364         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1365 
1366         xfrm_state_put(x);
1367 
1368         pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1369 
1370         return 0;
1371 }
1372 
1373 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1374 {
1375         struct net *net = sock_net(sk);
1376         struct xfrm_state *x;
1377 
1378         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1379                 return -EOPNOTSUPP;
1380 
1381         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1382                 return 0;
1383 
1384         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1385         if (x == NULL)
1386                 return 0;
1387 
1388         spin_lock_bh(&x->lock);
1389         if (x->km.state == XFRM_STATE_ACQ)
1390                 x->km.state = XFRM_STATE_ERROR;
1391 
1392         spin_unlock_bh(&x->lock);
1393         xfrm_state_put(x);
1394         return 0;
1395 }
1396 
1397 static inline int event2poltype(int event)
1398 {
1399         switch (event) {
1400         case XFRM_MSG_DELPOLICY:
1401                 return SADB_X_SPDDELETE;
1402         case XFRM_MSG_NEWPOLICY:
1403                 return SADB_X_SPDADD;
1404         case XFRM_MSG_UPDPOLICY:
1405                 return SADB_X_SPDUPDATE;
1406         case XFRM_MSG_POLEXPIRE:
1407         //      return SADB_X_SPDEXPIRE;
1408         default:
1409                 pr_err("pfkey: Unknown policy event %d\n", event);
1410                 break;
1411         }
1412 
1413         return 0;
1414 }
1415 
1416 static inline int event2keytype(int event)
1417 {
1418         switch (event) {
1419         case XFRM_MSG_DELSA:
1420                 return SADB_DELETE;
1421         case XFRM_MSG_NEWSA:
1422                 return SADB_ADD;
1423         case XFRM_MSG_UPDSA:
1424                 return SADB_UPDATE;
1425         case XFRM_MSG_EXPIRE:
1426                 return SADB_EXPIRE;
1427         default:
1428                 pr_err("pfkey: Unknown SA event %d\n", event);
1429                 break;
1430         }
1431 
1432         return 0;
1433 }
1434 
1435 /* ADD/UPD/DEL */
1436 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1437 {
1438         struct sk_buff *skb;
1439         struct sadb_msg *hdr;
1440 
1441         skb = pfkey_xfrm_state2msg(x);
1442 
1443         if (IS_ERR(skb))
1444                 return PTR_ERR(skb);
1445 
1446         hdr = (struct sadb_msg *) skb->data;
1447         hdr->sadb_msg_version = PF_KEY_V2;
1448         hdr->sadb_msg_type = event2keytype(c->event);
1449         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1450         hdr->sadb_msg_errno = 0;
1451         hdr->sadb_msg_reserved = 0;
1452         hdr->sadb_msg_seq = c->seq;
1453         hdr->sadb_msg_pid = c->portid;
1454 
1455         pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1456 
1457         return 0;
1458 }
1459 
1460 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1461 {
1462         struct net *net = sock_net(sk);
1463         struct xfrm_state *x;
1464         int err;
1465         struct km_event c;
1466 
1467         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1468         if (IS_ERR(x))
1469                 return PTR_ERR(x);
1470 
1471         xfrm_state_hold(x);
1472         if (hdr->sadb_msg_type == SADB_ADD)
1473                 err = xfrm_state_add(x);
1474         else
1475                 err = xfrm_state_update(x);
1476 
1477         xfrm_audit_state_add(x, err ? 0 : 1, true);
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, true);
1532         xfrm_state_put(x);
1533 
1534         return err;
1535 }
1536 
1537 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1538 {
1539         struct net *net = sock_net(sk);
1540         __u8 proto;
1541         struct sk_buff *out_skb;
1542         struct sadb_msg *out_hdr;
1543         struct xfrm_state *x;
1544 
1545         if (!ext_hdrs[SADB_EXT_SA-1] ||
1546             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548                 return -EINVAL;
1549 
1550         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551         if (x == NULL)
1552                 return -ESRCH;
1553 
1554         out_skb = pfkey_xfrm_state2msg(x);
1555         proto = x->id.proto;
1556         xfrm_state_put(x);
1557         if (IS_ERR(out_skb))
1558                 return  PTR_ERR(out_skb);
1559 
1560         out_hdr = (struct sadb_msg *) out_skb->data;
1561         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1562         out_hdr->sadb_msg_type = SADB_GET;
1563         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1564         out_hdr->sadb_msg_errno = 0;
1565         out_hdr->sadb_msg_reserved = 0;
1566         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1567         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1568         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1569 
1570         return 0;
1571 }
1572 
1573 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1574                                               gfp_t allocation)
1575 {
1576         struct sk_buff *skb;
1577         struct sadb_msg *hdr;
1578         int len, auth_len, enc_len, i;
1579 
1580         auth_len = xfrm_count_pfkey_auth_supported();
1581         if (auth_len) {
1582                 auth_len *= sizeof(struct sadb_alg);
1583                 auth_len += sizeof(struct sadb_supported);
1584         }
1585 
1586         enc_len = xfrm_count_pfkey_enc_supported();
1587         if (enc_len) {
1588                 enc_len *= sizeof(struct sadb_alg);
1589                 enc_len += sizeof(struct sadb_supported);
1590         }
1591 
1592         len = enc_len + auth_len + sizeof(struct sadb_msg);
1593 
1594         skb = alloc_skb(len + 16, allocation);
1595         if (!skb)
1596                 goto out_put_algs;
1597 
1598         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1599         pfkey_hdr_dup(hdr, orig);
1600         hdr->sadb_msg_errno = 0;
1601         hdr->sadb_msg_len = len / sizeof(uint64_t);
1602 
1603         if (auth_len) {
1604                 struct sadb_supported *sp;
1605                 struct sadb_alg *ap;
1606 
1607                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1608                 ap = (struct sadb_alg *) (sp + 1);
1609 
1610                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1611                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1612 
1613                 for (i = 0; ; i++) {
1614                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1615                         if (!aalg)
1616                                 break;
1617                         if (!aalg->pfkey_supported)
1618                                 continue;
1619                         if (aalg->available)
1620                                 *ap++ = aalg->desc;
1621                 }
1622         }
1623 
1624         if (enc_len) {
1625                 struct sadb_supported *sp;
1626                 struct sadb_alg *ap;
1627 
1628                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1629                 ap = (struct sadb_alg *) (sp + 1);
1630 
1631                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1632                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1633 
1634                 for (i = 0; ; i++) {
1635                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1636                         if (!ealg)
1637                                 break;
1638                         if (!ealg->pfkey_supported)
1639                                 continue;
1640                         if (ealg->available)
1641                                 *ap++ = ealg->desc;
1642                 }
1643         }
1644 
1645 out_put_algs:
1646         return skb;
1647 }
1648 
1649 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1650 {
1651         struct pfkey_sock *pfk = pfkey_sk(sk);
1652         struct sk_buff *supp_skb;
1653 
1654         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1655                 return -EINVAL;
1656 
1657         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1658                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1659                         return -EEXIST;
1660                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1661         }
1662 
1663         xfrm_probe_algs();
1664 
1665         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1666         if (!supp_skb) {
1667                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1668                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1669 
1670                 return -ENOBUFS;
1671         }
1672 
1673         pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1674 
1675         return 0;
1676 }
1677 
1678 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1679 {
1680         struct sk_buff *skb;
1681         struct sadb_msg *hdr;
1682 
1683         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1684         if (!skb)
1685                 return -ENOBUFS;
1686 
1687         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1688         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1689         hdr->sadb_msg_errno = (uint8_t) 0;
1690         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1691 
1692         return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1693 }
1694 
1695 static int key_notify_sa_flush(const struct km_event *c)
1696 {
1697         struct sk_buff *skb;
1698         struct sadb_msg *hdr;
1699 
1700         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1701         if (!skb)
1702                 return -ENOBUFS;
1703         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1704         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1705         hdr->sadb_msg_type = SADB_FLUSH;
1706         hdr->sadb_msg_seq = c->seq;
1707         hdr->sadb_msg_pid = c->portid;
1708         hdr->sadb_msg_version = PF_KEY_V2;
1709         hdr->sadb_msg_errno = (uint8_t) 0;
1710         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1711         hdr->sadb_msg_reserved = 0;
1712 
1713         pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1714 
1715         return 0;
1716 }
1717 
1718 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1719 {
1720         struct net *net = sock_net(sk);
1721         unsigned int proto;
1722         struct km_event c;
1723         int err, err2;
1724 
1725         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1726         if (proto == 0)
1727                 return -EINVAL;
1728 
1729         err = xfrm_state_flush(net, proto, true);
1730         err2 = unicast_flush_resp(sk, hdr);
1731         if (err || err2) {
1732                 if (err == -ESRCH) /* empty table - go quietly */
1733                         err = 0;
1734                 return err ? err : err2;
1735         }
1736 
1737         c.data.proto = proto;
1738         c.seq = hdr->sadb_msg_seq;
1739         c.portid = hdr->sadb_msg_pid;
1740         c.event = XFRM_MSG_FLUSHSA;
1741         c.net = net;
1742         km_state_notify(NULL, &c);
1743 
1744         return 0;
1745 }
1746 
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749         struct pfkey_sock *pfk = ptr;
1750         struct sk_buff *out_skb;
1751         struct sadb_msg *out_hdr;
1752 
1753         if (!pfkey_can_dump(&pfk->sk))
1754                 return -ENOBUFS;
1755 
1756         out_skb = pfkey_xfrm_state2msg(x);
1757         if (IS_ERR(out_skb))
1758                 return PTR_ERR(out_skb);
1759 
1760         out_hdr = (struct sadb_msg *) out_skb->data;
1761         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762         out_hdr->sadb_msg_type = SADB_DUMP;
1763         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764         out_hdr->sadb_msg_errno = 0;
1765         out_hdr->sadb_msg_reserved = 0;
1766         out_hdr->sadb_msg_seq = count + 1;
1767         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1768 
1769         if (pfk->dump.skb)
1770                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1771                                 &pfk->sk, sock_net(&pfk->sk));
1772         pfk->dump.skb = out_skb;
1773 
1774         return 0;
1775 }
1776 
1777 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778 {
1779         struct net *net = sock_net(&pfk->sk);
1780         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781 }
1782 
1783 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784 {
1785         struct net *net = sock_net(&pfk->sk);
1786 
1787         xfrm_state_walk_done(&pfk->dump.u.state, net);
1788 }
1789 
1790 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1791 {
1792         u8 proto;
1793         struct xfrm_address_filter *filter = NULL;
1794         struct pfkey_sock *pfk = pfkey_sk(sk);
1795 
1796         if (pfk->dump.dump != NULL)
1797                 return -EBUSY;
1798 
1799         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1800         if (proto == 0)
1801                 return -EINVAL;
1802 
1803         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1804                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1805 
1806                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1807                 if (filter == NULL)
1808                         return -ENOMEM;
1809 
1810                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1811                        sizeof(xfrm_address_t));
1812                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1813                        sizeof(xfrm_address_t));
1814                 filter->family = xfilter->sadb_x_filter_family;
1815                 filter->splen = xfilter->sadb_x_filter_splen;
1816                 filter->dplen = xfilter->sadb_x_filter_dplen;
1817         }
1818 
1819         pfk->dump.msg_version = hdr->sadb_msg_version;
1820         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1821         pfk->dump.dump = pfkey_dump_sa;
1822         pfk->dump.done = pfkey_dump_sa_done;
1823         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1824 
1825         return pfkey_do_dump(pfk);
1826 }
1827 
1828 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1829 {
1830         struct pfkey_sock *pfk = pfkey_sk(sk);
1831         int satype = hdr->sadb_msg_satype;
1832         bool reset_errno = false;
1833 
1834         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1835                 reset_errno = true;
1836                 if (satype != 0 && satype != 1)
1837                         return -EINVAL;
1838                 pfk->promisc = satype;
1839         }
1840         if (reset_errno && skb_cloned(skb))
1841                 skb = skb_copy(skb, GFP_KERNEL);
1842         else
1843                 skb = skb_clone(skb, GFP_KERNEL);
1844 
1845         if (reset_errno && skb) {
1846                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1847                 new_hdr->sadb_msg_errno = 0;
1848         }
1849 
1850         pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1851         return 0;
1852 }
1853 
1854 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1855 {
1856         int i;
1857         u32 reqid = *(u32*)ptr;
1858 
1859         for (i=0; i<xp->xfrm_nr; i++) {
1860                 if (xp->xfrm_vec[i].reqid == reqid)
1861                         return -EEXIST;
1862         }
1863         return 0;
1864 }
1865 
1866 static u32 gen_reqid(struct net *net)
1867 {
1868         struct xfrm_policy_walk walk;
1869         u32 start;
1870         int rc;
1871         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1872 
1873         start = reqid;
1874         do {
1875                 ++reqid;
1876                 if (reqid == 0)
1877                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1878                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1879                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1880                 xfrm_policy_walk_done(&walk, net);
1881                 if (rc != -EEXIST)
1882                         return reqid;
1883         } while (reqid != start);
1884         return 0;
1885 }
1886 
1887 static int
1888 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1889 {
1890         struct net *net = xp_net(xp);
1891         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1892         int mode;
1893 
1894         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1895                 return -ELOOP;
1896 
1897         if (rq->sadb_x_ipsecrequest_mode == 0)
1898                 return -EINVAL;
1899 
1900         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1901         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1902                 return -EINVAL;
1903         t->mode = mode;
1904         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1905                 t->optional = 1;
1906         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1907                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1908                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1909                         t->reqid = 0;
1910                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1911                         return -ENOBUFS;
1912         }
1913 
1914         /* addresses present only in tunnel mode */
1915         if (t->mode == XFRM_MODE_TUNNEL) {
1916                 u8 *sa = (u8 *) (rq + 1);
1917                 int family, socklen;
1918 
1919                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1920                                                 &t->saddr);
1921                 if (!family)
1922                         return -EINVAL;
1923 
1924                 socklen = pfkey_sockaddr_len(family);
1925                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1926                                            &t->id.daddr) != family)
1927                         return -EINVAL;
1928                 t->encap_family = family;
1929         } else
1930                 t->encap_family = xp->family;
1931 
1932         /* No way to set this via kame pfkey */
1933         t->allalgs = 1;
1934         xp->xfrm_nr++;
1935         return 0;
1936 }
1937 
1938 static int
1939 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1940 {
1941         int err;
1942         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1943         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1944 
1945         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1946                 return -EINVAL;
1947 
1948         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1949                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1950                         return err;
1951                 len -= rq->sadb_x_ipsecrequest_len;
1952                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1953         }
1954         return 0;
1955 }
1956 
1957 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1958 {
1959   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1960 
1961         if (xfrm_ctx) {
1962                 int len = sizeof(struct sadb_x_sec_ctx);
1963                 len += xfrm_ctx->ctx_len;
1964                 return PFKEY_ALIGN8(len);
1965         }
1966         return 0;
1967 }
1968 
1969 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1970 {
1971         const struct xfrm_tmpl *t;
1972         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1973         int socklen = 0;
1974         int i;
1975 
1976         for (i=0; i<xp->xfrm_nr; i++) {
1977                 t = xp->xfrm_vec + i;
1978                 socklen += pfkey_sockaddr_len(t->encap_family);
1979         }
1980 
1981         return sizeof(struct sadb_msg) +
1982                 (sizeof(struct sadb_lifetime) * 3) +
1983                 (sizeof(struct sadb_address) * 2) +
1984                 (sockaddr_size * 2) +
1985                 sizeof(struct sadb_x_policy) +
1986                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1987                 (socklen * 2) +
1988                 pfkey_xfrm_policy2sec_ctx_size(xp);
1989 }
1990 
1991 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1992 {
1993         struct sk_buff *skb;
1994         int size;
1995 
1996         size = pfkey_xfrm_policy2msg_size(xp);
1997 
1998         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1999         if (skb == NULL)
2000                 return ERR_PTR(-ENOBUFS);
2001 
2002         return skb;
2003 }
2004 
2005 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2006 {
2007         struct sadb_msg *hdr;
2008         struct sadb_address *addr;
2009         struct sadb_lifetime *lifetime;
2010         struct sadb_x_policy *pol;
2011         struct sadb_x_sec_ctx *sec_ctx;
2012         struct xfrm_sec_ctx *xfrm_ctx;
2013         int i;
2014         int size;
2015         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2016         int socklen = pfkey_sockaddr_len(xp->family);
2017 
2018         size = pfkey_xfrm_policy2msg_size(xp);
2019 
2020         /* call should fill header later */
2021         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2022         memset(hdr, 0, size);   /* XXX do we need this ? */
2023 
2024         /* src address */
2025         addr = (struct sadb_address*) skb_put(skb,
2026                                               sizeof(struct sadb_address)+sockaddr_size);
2027         addr->sadb_address_len =
2028                 (sizeof(struct sadb_address)+sockaddr_size)/
2029                         sizeof(uint64_t);
2030         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2031         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2032         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2033         addr->sadb_address_reserved = 0;
2034         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2035                                  xp->selector.sport,
2036                                  (struct sockaddr *) (addr + 1),
2037                                  xp->family))
2038                 BUG();
2039 
2040         /* dst address */
2041         addr = (struct sadb_address*) skb_put(skb,
2042                                               sizeof(struct sadb_address)+sockaddr_size);
2043         addr->sadb_address_len =
2044                 (sizeof(struct sadb_address)+sockaddr_size)/
2045                         sizeof(uint64_t);
2046         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2047         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2048         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2049         addr->sadb_address_reserved = 0;
2050 
2051         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2052                             (struct sockaddr *) (addr + 1),
2053                             xp->family);
2054 
2055         /* hard time */
2056         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2057                                                      sizeof(struct sadb_lifetime));
2058         lifetime->sadb_lifetime_len =
2059                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2060         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2061         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2062         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2063         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2064         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2065         /* soft time */
2066         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2067                                                      sizeof(struct sadb_lifetime));
2068         lifetime->sadb_lifetime_len =
2069                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2070         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2071         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2072         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2073         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2074         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2075         /* current time */
2076         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2077                                                      sizeof(struct sadb_lifetime));
2078         lifetime->sadb_lifetime_len =
2079                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2080         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2081         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2082         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2083         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2084         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2085 
2086         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2087         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2088         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2089         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2090         if (xp->action == XFRM_POLICY_ALLOW) {
2091                 if (xp->xfrm_nr)
2092                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2093                 else
2094                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2095         }
2096         pol->sadb_x_policy_dir = dir+1;
2097         pol->sadb_x_policy_reserved = 0;
2098         pol->sadb_x_policy_id = xp->index;
2099         pol->sadb_x_policy_priority = xp->priority;
2100 
2101         for (i=0; i<xp->xfrm_nr; i++) {
2102                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2103                 struct sadb_x_ipsecrequest *rq;
2104                 int req_size;
2105                 int mode;
2106 
2107                 req_size = sizeof(struct sadb_x_ipsecrequest);
2108                 if (t->mode == XFRM_MODE_TUNNEL) {
2109                         socklen = pfkey_sockaddr_len(t->encap_family);
2110                         req_size += socklen * 2;
2111                 } else {
2112                         size -= 2*socklen;
2113                 }
2114                 rq = (void*)skb_put(skb, req_size);
2115                 pol->sadb_x_policy_len += req_size/8;
2116                 memset(rq, 0, sizeof(*rq));
2117                 rq->sadb_x_ipsecrequest_len = req_size;
2118                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2119                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2120                         return -EINVAL;
2121                 rq->sadb_x_ipsecrequest_mode = mode;
2122                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2123                 if (t->reqid)
2124                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2125                 if (t->optional)
2126                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2127                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2128 
2129                 if (t->mode == XFRM_MODE_TUNNEL) {
2130                         u8 *sa = (void *)(rq + 1);
2131                         pfkey_sockaddr_fill(&t->saddr, 0,
2132                                             (struct sockaddr *)sa,
2133                                             t->encap_family);
2134                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2135                                             (struct sockaddr *) (sa + socklen),
2136                                             t->encap_family);
2137                 }
2138         }
2139 
2140         /* security context */
2141         if ((xfrm_ctx = xp->security)) {
2142                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2143 
2144                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2145                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2146                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2147                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2148                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2149                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2150                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2151                        xfrm_ctx->ctx_len);
2152         }
2153 
2154         hdr->sadb_msg_len = size / sizeof(uint64_t);
2155         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2156 
2157         return 0;
2158 }
2159 
2160 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2161 {
2162         struct sk_buff *out_skb;
2163         struct sadb_msg *out_hdr;
2164         int err;
2165 
2166         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2167         if (IS_ERR(out_skb))
2168                 return PTR_ERR(out_skb);
2169 
2170         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2171         if (err < 0)
2172                 return err;
2173 
2174         out_hdr = (struct sadb_msg *) out_skb->data;
2175         out_hdr->sadb_msg_version = PF_KEY_V2;
2176 
2177         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2178                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2179         else
2180                 out_hdr->sadb_msg_type = event2poltype(c->event);
2181         out_hdr->sadb_msg_errno = 0;
2182         out_hdr->sadb_msg_seq = c->seq;
2183         out_hdr->sadb_msg_pid = c->portid;
2184         pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2185         return 0;
2186 
2187 }
2188 
2189 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2190 {
2191         struct net *net = sock_net(sk);
2192         int err = 0;
2193         struct sadb_lifetime *lifetime;
2194         struct sadb_address *sa;
2195         struct sadb_x_policy *pol;
2196         struct xfrm_policy *xp;
2197         struct km_event c;
2198         struct sadb_x_sec_ctx *sec_ctx;
2199 
2200         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2201                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2202             !ext_hdrs[SADB_X_EXT_POLICY-1])
2203                 return -EINVAL;
2204 
2205         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2206         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2207                 return -EINVAL;
2208         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2209                 return -EINVAL;
2210 
2211         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2212         if (xp == NULL)
2213                 return -ENOBUFS;
2214 
2215         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2216                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2217         xp->priority = pol->sadb_x_policy_priority;
2218 
2219         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2220         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2221         xp->selector.family = xp->family;
2222         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2223         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2224         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2225         if (xp->selector.sport)
2226                 xp->selector.sport_mask = htons(0xffff);
2227 
2228         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2229         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2230         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2231 
2232         /* Amusing, we set this twice.  KAME apps appear to set same value
2233          * in both addresses.
2234          */
2235         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2236 
2237         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2238         if (xp->selector.dport)
2239                 xp->selector.dport_mask = htons(0xffff);
2240 
2241         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2242         if (sec_ctx != NULL) {
2243                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2244 
2245                 if (!uctx) {
2246                         err = -ENOBUFS;
2247                         goto out;
2248                 }
2249 
2250                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2251                 kfree(uctx);
2252 
2253                 if (err)
2254                         goto out;
2255         }
2256 
2257         xp->lft.soft_byte_limit = XFRM_INF;
2258         xp->lft.hard_byte_limit = XFRM_INF;
2259         xp->lft.soft_packet_limit = XFRM_INF;
2260         xp->lft.hard_packet_limit = XFRM_INF;
2261         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2262                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2263                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2264                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2265                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2266         }
2267         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2268                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2269                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2270                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2271                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2272         }
2273         xp->xfrm_nr = 0;
2274         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2275             (err = parse_ipsecrequests(xp, pol)) < 0)
2276                 goto out;
2277 
2278         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2279                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2280 
2281         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2282 
2283         if (err)
2284                 goto out;
2285 
2286         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2287                 c.event = XFRM_MSG_UPDPOLICY;
2288         else
2289                 c.event = XFRM_MSG_NEWPOLICY;
2290 
2291         c.seq = hdr->sadb_msg_seq;
2292         c.portid = hdr->sadb_msg_pid;
2293 
2294         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2295         xfrm_pol_put(xp);
2296         return 0;
2297 
2298 out:
2299         xp->walk.dead = 1;
2300         xfrm_policy_destroy(xp);
2301         return err;
2302 }
2303 
2304 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2305 {
2306         struct net *net = sock_net(sk);
2307         int err;
2308         struct sadb_address *sa;
2309         struct sadb_x_policy *pol;
2310         struct xfrm_policy *xp;
2311         struct xfrm_selector sel;
2312         struct km_event c;
2313         struct sadb_x_sec_ctx *sec_ctx;
2314         struct xfrm_sec_ctx *pol_ctx = NULL;
2315 
2316         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2317                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2318             !ext_hdrs[SADB_X_EXT_POLICY-1])
2319                 return -EINVAL;
2320 
2321         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2322         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2323                 return -EINVAL;
2324 
2325         memset(&sel, 0, sizeof(sel));
2326 
2327         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2328         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2329         sel.prefixlen_s = sa->sadb_address_prefixlen;
2330         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332         if (sel.sport)
2333                 sel.sport_mask = htons(0xffff);
2334 
2335         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2336         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2337         sel.prefixlen_d = sa->sadb_address_prefixlen;
2338         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2339         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2340         if (sel.dport)
2341                 sel.dport_mask = htons(0xffff);
2342 
2343         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2344         if (sec_ctx != NULL) {
2345                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2346 
2347                 if (!uctx)
2348                         return -ENOMEM;
2349 
2350                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2351                 kfree(uctx);
2352                 if (err)
2353                         return err;
2354         }
2355 
2356         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2357                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2358                                    1, &err);
2359         security_xfrm_policy_free(pol_ctx);
2360         if (xp == NULL)
2361                 return -ENOENT;
2362 
2363         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2364 
2365         if (err)
2366                 goto out;
2367 
2368         c.seq = hdr->sadb_msg_seq;
2369         c.portid = hdr->sadb_msg_pid;
2370         c.data.byid = 0;
2371         c.event = XFRM_MSG_DELPOLICY;
2372         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2373 
2374 out:
2375         xfrm_pol_put(xp);
2376         if (err == 0)
2377                 xfrm_garbage_collect(net);
2378         return err;
2379 }
2380 
2381 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2382 {
2383         int err;
2384         struct sk_buff *out_skb;
2385         struct sadb_msg *out_hdr;
2386         err = 0;
2387 
2388         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2389         if (IS_ERR(out_skb)) {
2390                 err =  PTR_ERR(out_skb);
2391                 goto out;
2392         }
2393         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2394         if (err < 0)
2395                 goto out;
2396 
2397         out_hdr = (struct sadb_msg *) out_skb->data;
2398         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2399         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2400         out_hdr->sadb_msg_satype = 0;
2401         out_hdr->sadb_msg_errno = 0;
2402         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2403         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2404         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2405         err = 0;
2406 
2407 out:
2408         return err;
2409 }
2410 
2411 #ifdef CONFIG_NET_KEY_MIGRATE
2412 static int pfkey_sockaddr_pair_size(sa_family_t family)
2413 {
2414         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2415 }
2416 
2417 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2418                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2419                                u16 *family)
2420 {
2421         int af, socklen;
2422 
2423         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2424                 return -EINVAL;
2425 
2426         af = pfkey_sockaddr_extract(sa, saddr);
2427         if (!af)
2428                 return -EINVAL;
2429 
2430         socklen = pfkey_sockaddr_len(af);
2431         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2432                                    daddr) != af)
2433                 return -EINVAL;
2434 
2435         *family = af;
2436         return 0;
2437 }
2438 
2439 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2440                                     struct xfrm_migrate *m)
2441 {
2442         int err;
2443         struct sadb_x_ipsecrequest *rq2;
2444         int mode;
2445 
2446         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2447             len < rq1->sadb_x_ipsecrequest_len)
2448                 return -EINVAL;
2449 
2450         /* old endoints */
2451         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2452                                   rq1->sadb_x_ipsecrequest_len,
2453                                   &m->old_saddr, &m->old_daddr,
2454                                   &m->old_family);
2455         if (err)
2456                 return err;
2457 
2458         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2459         len -= rq1->sadb_x_ipsecrequest_len;
2460 
2461         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2462             len < rq2->sadb_x_ipsecrequest_len)
2463                 return -EINVAL;
2464 
2465         /* new endpoints */
2466         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2467                                   rq2->sadb_x_ipsecrequest_len,
2468                                   &m->new_saddr, &m->new_daddr,
2469                                   &m->new_family);
2470         if (err)
2471                 return err;
2472 
2473         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2474             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2475             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2476                 return -EINVAL;
2477 
2478         m->proto = rq1->sadb_x_ipsecrequest_proto;
2479         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2480                 return -EINVAL;
2481         m->mode = mode;
2482         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2483 
2484         return ((int)(rq1->sadb_x_ipsecrequest_len +
2485                       rq2->sadb_x_ipsecrequest_len));
2486 }
2487 
2488 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2489                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2490 {
2491         int i, len, ret, err = -EINVAL;
2492         u8 dir;
2493         struct sadb_address *sa;
2494         struct sadb_x_kmaddress *kma;
2495         struct sadb_x_policy *pol;
2496         struct sadb_x_ipsecrequest *rq;
2497         struct xfrm_selector sel;
2498         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2499         struct xfrm_kmaddress k;
2500         struct net *net = sock_net(sk);
2501 
2502         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2503                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2504             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2505                 err = -EINVAL;
2506                 goto out;
2507         }
2508 
2509         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2510         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2511 
2512         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2513                 err = -EINVAL;
2514                 goto out;
2515         }
2516 
2517         if (kma) {
2518                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2519                 k.reserved = kma->sadb_x_kmaddress_reserved;
2520                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2521                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2522                                           &k.local, &k.remote, &k.family);
2523                 if (ret < 0) {
2524                         err = ret;
2525                         goto out;
2526                 }
2527         }
2528 
2529         dir = pol->sadb_x_policy_dir - 1;
2530         memset(&sel, 0, sizeof(sel));
2531 
2532         /* set source address info of selector */
2533         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2534         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2535         sel.prefixlen_s = sa->sadb_address_prefixlen;
2536         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2537         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2538         if (sel.sport)
2539                 sel.sport_mask = htons(0xffff);
2540 
2541         /* set destination address info of selector */
2542         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2543         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2544         sel.prefixlen_d = sa->sadb_address_prefixlen;
2545         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2546         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2547         if (sel.dport)
2548                 sel.dport_mask = htons(0xffff);
2549 
2550         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2551 
2552         /* extract ipsecrequests */
2553         i = 0;
2554         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2555 
2556         while (len > 0 && i < XFRM_MAX_DEPTH) {
2557                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2558                 if (ret < 0) {
2559                         err = ret;
2560                         goto out;
2561                 } else {
2562                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2563                         len -= ret;
2564                         i++;
2565                 }
2566         }
2567 
2568         if (!i || len > 0) {
2569                 err = -EINVAL;
2570                 goto out;
2571         }
2572 
2573         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2574                             kma ? &k : NULL, net);
2575 
2576  out:
2577         return err;
2578 }
2579 #else
2580 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2581                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2582 {
2583         return -ENOPROTOOPT;
2584 }
2585 #endif
2586 
2587 
2588 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2589 {
2590         struct net *net = sock_net(sk);
2591         unsigned int dir;
2592         int err = 0, delete;
2593         struct sadb_x_policy *pol;
2594         struct xfrm_policy *xp;
2595         struct km_event c;
2596 
2597         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2598                 return -EINVAL;
2599 
2600         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2601         if (dir >= XFRM_POLICY_MAX)
2602                 return -EINVAL;
2603 
2604         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2605         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2606                               dir, pol->sadb_x_policy_id, delete, &err);
2607         if (xp == NULL)
2608                 return -ENOENT;
2609 
2610         if (delete) {
2611                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2612 
2613                 if (err)
2614                         goto out;
2615                 c.seq = hdr->sadb_msg_seq;
2616                 c.portid = hdr->sadb_msg_pid;
2617                 c.data.byid = 1;
2618                 c.event = XFRM_MSG_DELPOLICY;
2619                 km_policy_notify(xp, dir, &c);
2620         } else {
2621                 err = key_pol_get_resp(sk, xp, hdr, dir);
2622         }
2623 
2624 out:
2625         xfrm_pol_put(xp);
2626         if (delete && err == 0)
2627                 xfrm_garbage_collect(net);
2628         return err;
2629 }
2630 
2631 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2632 {
2633         struct pfkey_sock *pfk = ptr;
2634         struct sk_buff *out_skb;
2635         struct sadb_msg *out_hdr;
2636         int err;
2637 
2638         if (!pfkey_can_dump(&pfk->sk))
2639                 return -ENOBUFS;
2640 
2641         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2642         if (IS_ERR(out_skb))
2643                 return PTR_ERR(out_skb);
2644 
2645         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2646         if (err < 0)
2647                 return err;
2648 
2649         out_hdr = (struct sadb_msg *) out_skb->data;
2650         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2651         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2652         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2653         out_hdr->sadb_msg_errno = 0;
2654         out_hdr->sadb_msg_seq = count + 1;
2655         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2656 
2657         if (pfk->dump.skb)
2658                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2659                                 &pfk->sk, sock_net(&pfk->sk));
2660         pfk->dump.skb = out_skb;
2661 
2662         return 0;
2663 }
2664 
2665 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2666 {
2667         struct net *net = sock_net(&pfk->sk);
2668         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2669 }
2670 
2671 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2672 {
2673         struct net *net = sock_net((struct sock *)pfk);
2674 
2675         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2676 }
2677 
2678 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2679 {
2680         struct pfkey_sock *pfk = pfkey_sk(sk);
2681 
2682         if (pfk->dump.dump != NULL)
2683                 return -EBUSY;
2684 
2685         pfk->dump.msg_version = hdr->sadb_msg_version;
2686         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2687         pfk->dump.dump = pfkey_dump_sp;
2688         pfk->dump.done = pfkey_dump_sp_done;
2689         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2690 
2691         return pfkey_do_dump(pfk);
2692 }
2693 
2694 static int key_notify_policy_flush(const struct km_event *c)
2695 {
2696         struct sk_buff *skb_out;
2697         struct sadb_msg *hdr;
2698 
2699         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2700         if (!skb_out)
2701                 return -ENOBUFS;
2702         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2703         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2704         hdr->sadb_msg_seq = c->seq;
2705         hdr->sadb_msg_pid = c->portid;
2706         hdr->sadb_msg_version = PF_KEY_V2;
2707         hdr->sadb_msg_errno = (uint8_t) 0;
2708         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2709         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2710         hdr->sadb_msg_reserved = 0;
2711         pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2712         return 0;
2713 
2714 }
2715 
2716 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2717 {
2718         struct net *net = sock_net(sk);
2719         struct km_event c;
2720         int err, err2;
2721 
2722         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2723         err2 = unicast_flush_resp(sk, hdr);
2724         if (err || err2) {
2725                 if (err == -ESRCH) /* empty table - old silent behavior */
2726                         return 0;
2727                 return err;
2728         }
2729 
2730         c.data.type = XFRM_POLICY_TYPE_MAIN;
2731         c.event = XFRM_MSG_FLUSHPOLICY;
2732         c.portid = hdr->sadb_msg_pid;
2733         c.seq = hdr->sadb_msg_seq;
2734         c.net = net;
2735         km_policy_notify(NULL, 0, &c);
2736 
2737         return 0;
2738 }
2739 
2740 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2741                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2742 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2743         [SADB_RESERVED]         = pfkey_reserved,
2744         [SADB_GETSPI]           = pfkey_getspi,
2745         [SADB_UPDATE]           = pfkey_add,
2746         [SADB_ADD]              = pfkey_add,
2747         [SADB_DELETE]           = pfkey_delete,
2748         [SADB_GET]              = pfkey_get,
2749         [SADB_ACQUIRE]          = pfkey_acquire,
2750         [SADB_REGISTER]         = pfkey_register,
2751         [SADB_EXPIRE]           = NULL,
2752         [SADB_FLUSH]            = pfkey_flush,
2753         [SADB_DUMP]             = pfkey_dump,
2754         [SADB_X_PROMISC]        = pfkey_promisc,
2755         [SADB_X_PCHANGE]        = NULL,
2756         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2757         [SADB_X_SPDADD]         = pfkey_spdadd,
2758         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2759         [SADB_X_SPDGET]         = pfkey_spdget,
2760         [SADB_X_SPDACQUIRE]     = NULL,
2761         [SADB_X_SPDDUMP]        = pfkey_spddump,
2762         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2763         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2764         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2765         [SADB_X_MIGRATE]        = pfkey_migrate,
2766 };
2767 
2768 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2769 {
2770         void *ext_hdrs[SADB_EXT_MAX];
2771         int err;
2772 
2773         pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2774                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2775 
2776         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2777         err = parse_exthdrs(skb, hdr, ext_hdrs);
2778         if (!err) {
2779                 err = -EOPNOTSUPP;
2780                 if (pfkey_funcs[hdr->sadb_msg_type])
2781                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2782         }
2783         return err;
2784 }
2785 
2786 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2787 {
2788         struct sadb_msg *hdr = NULL;
2789 
2790         if (skb->len < sizeof(*hdr)) {
2791                 *errp = -EMSGSIZE;
2792         } else {
2793                 hdr = (struct sadb_msg *) skb->data;
2794                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2795                     hdr->sadb_msg_reserved != 0 ||
2796                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2797                      hdr->sadb_msg_type > SADB_MAX)) {
2798                         hdr = NULL;
2799                         *errp = -EINVAL;
2800                 } else if (hdr->sadb_msg_len != (skb->len /
2801                                                  sizeof(uint64_t)) ||
2802                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2803                                                 sizeof(uint64_t))) {
2804                         hdr = NULL;
2805                         *errp = -EMSGSIZE;
2806                 } else {
2807                         *errp = 0;
2808                 }
2809         }
2810         return hdr;
2811 }
2812 
2813 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2814                                 const struct xfrm_algo_desc *d)
2815 {
2816         unsigned int id = d->desc.sadb_alg_id;
2817 
2818         if (id >= sizeof(t->aalgos) * 8)
2819                 return 0;
2820 
2821         return (t->aalgos >> id) & 1;
2822 }
2823 
2824 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2825                                 const struct xfrm_algo_desc *d)
2826 {
2827         unsigned int id = d->desc.sadb_alg_id;
2828 
2829         if (id >= sizeof(t->ealgos) * 8)
2830                 return 0;
2831 
2832         return (t->ealgos >> id) & 1;
2833 }
2834 
2835 static int count_ah_combs(const struct xfrm_tmpl *t)
2836 {
2837         int i, sz = 0;
2838 
2839         for (i = 0; ; i++) {
2840                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2841                 if (!aalg)
2842                         break;
2843                 if (!aalg->pfkey_supported)
2844                         continue;
2845                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2846                         sz += sizeof(struct sadb_comb);
2847         }
2848         return sz + sizeof(struct sadb_prop);
2849 }
2850 
2851 static int count_esp_combs(const struct xfrm_tmpl *t)
2852 {
2853         int i, k, sz = 0;
2854 
2855         for (i = 0; ; i++) {
2856                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2857                 if (!ealg)
2858                         break;
2859 
2860                 if (!ealg->pfkey_supported)
2861                         continue;
2862 
2863                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2864                         continue;
2865 
2866                 for (k = 1; ; k++) {
2867                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2868                         if (!aalg)
2869                                 break;
2870 
2871                         if (!aalg->pfkey_supported)
2872                                 continue;
2873 
2874                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2875                                 sz += sizeof(struct sadb_comb);
2876                 }
2877         }
2878         return sz + sizeof(struct sadb_prop);
2879 }
2880 
2881 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2882 {
2883         struct sadb_prop *p;
2884         int i;
2885 
2886         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2887         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2888         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2889         p->sadb_prop_replay = 32;
2890         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2891 
2892         for (i = 0; ; i++) {
2893                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2894                 if (!aalg)
2895                         break;
2896 
2897                 if (!aalg->pfkey_supported)
2898                         continue;
2899 
2900                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2901                         struct sadb_comb *c;
2902                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2903                         memset(c, 0, sizeof(*c));
2904                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2905                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2906                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2907                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2908                         c->sadb_comb_hard_addtime = 24*60*60;
2909                         c->sadb_comb_soft_addtime = 20*60*60;
2910                         c->sadb_comb_hard_usetime = 8*60*60;
2911                         c->sadb_comb_soft_usetime = 7*60*60;
2912                 }
2913         }
2914 }
2915 
2916 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2917 {
2918         struct sadb_prop *p;
2919         int i, k;
2920 
2921         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2922         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2923         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2924         p->sadb_prop_replay = 32;
2925         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2926 
2927         for (i=0; ; i++) {
2928                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2929                 if (!ealg)
2930                         break;
2931 
2932                 if (!ealg->pfkey_supported)
2933                         continue;
2934 
2935                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2936                         continue;
2937 
2938                 for (k = 1; ; k++) {
2939                         struct sadb_comb *c;
2940                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2941                         if (!aalg)
2942                                 break;
2943                         if (!aalg->pfkey_supported)
2944                                 continue;
2945                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2946                                 continue;
2947                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2948                         memset(c, 0, sizeof(*c));
2949                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2950                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2951                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2952                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2953                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2954                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2955                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2956                         c->sadb_comb_hard_addtime = 24*60*60;
2957                         c->sadb_comb_soft_addtime = 20*60*60;
2958                         c->sadb_comb_hard_usetime = 8*60*60;
2959                         c->sadb_comb_soft_usetime = 7*60*60;
2960                 }
2961         }
2962 }
2963 
2964 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2965 {
2966         return 0;
2967 }
2968 
2969 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2970 {
2971         struct sk_buff *out_skb;
2972         struct sadb_msg *out_hdr;
2973         int hard;
2974         int hsc;
2975 
2976         hard = c->data.hard;
2977         if (hard)
2978                 hsc = 2;
2979         else
2980                 hsc = 1;
2981 
2982         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2983         if (IS_ERR(out_skb))
2984                 return PTR_ERR(out_skb);
2985 
2986         out_hdr = (struct sadb_msg *) out_skb->data;
2987         out_hdr->sadb_msg_version = PF_KEY_V2;
2988         out_hdr->sadb_msg_type = SADB_EXPIRE;
2989         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2990         out_hdr->sadb_msg_errno = 0;
2991         out_hdr->sadb_msg_reserved = 0;
2992         out_hdr->sadb_msg_seq = 0;
2993         out_hdr->sadb_msg_pid = 0;
2994 
2995         pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
2996         return 0;
2997 }
2998 
2999 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3000 {
3001         struct net *net = x ? xs_net(x) : c->net;
3002         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3003 
3004         if (atomic_read(&net_pfkey->socks_nr) == 0)
3005                 return 0;
3006 
3007         switch (c->event) {
3008         case XFRM_MSG_EXPIRE:
3009                 return key_notify_sa_expire(x, c);
3010         case XFRM_MSG_DELSA:
3011         case XFRM_MSG_NEWSA:
3012         case XFRM_MSG_UPDSA:
3013                 return key_notify_sa(x, c);
3014         case XFRM_MSG_FLUSHSA:
3015                 return key_notify_sa_flush(c);
3016         case XFRM_MSG_NEWAE: /* not yet supported */
3017                 break;
3018         default:
3019                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3020                 break;
3021         }
3022 
3023         return 0;
3024 }
3025 
3026 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3027 {
3028         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3029                 return 0;
3030 
3031         switch (c->event) {
3032         case XFRM_MSG_POLEXPIRE:
3033                 return key_notify_policy_expire(xp, c);
3034         case XFRM_MSG_DELPOLICY:
3035         case XFRM_MSG_NEWPOLICY:
3036         case XFRM_MSG_UPDPOLICY:
3037                 return key_notify_policy(xp, dir, c);
3038         case XFRM_MSG_FLUSHPOLICY:
3039                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3040                         break;
3041                 return key_notify_policy_flush(c);
3042         default:
3043                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3044                 break;
3045         }
3046 
3047         return 0;
3048 }
3049 
3050 static u32 get_acqseq(void)
3051 {
3052         u32 res;
3053         static atomic_t acqseq;
3054 
3055         do {
3056                 res = atomic_inc_return(&acqseq);
3057         } while (!res);
3058         return res;
3059 }
3060 
3061 static bool pfkey_is_alive(const struct km_event *c)
3062 {
3063         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3064         struct sock *sk;
3065         bool is_alive = false;
3066 
3067         rcu_read_lock();
3068         sk_for_each_rcu(sk, &net_pfkey->table) {
3069                 if (pfkey_sk(sk)->registered) {
3070                         is_alive = true;
3071                         break;
3072                 }
3073         }
3074         rcu_read_unlock();
3075 
3076         return is_alive;
3077 }
3078 
3079 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3080 {
3081         struct sk_buff *skb;
3082         struct sadb_msg *hdr;
3083         struct sadb_address *addr;
3084         struct sadb_x_policy *pol;
3085         int sockaddr_size;
3086         int size;
3087         struct sadb_x_sec_ctx *sec_ctx;
3088         struct xfrm_sec_ctx *xfrm_ctx;
3089         int ctx_size = 0;
3090 
3091         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3092         if (!sockaddr_size)
3093                 return -EINVAL;
3094 
3095         size = sizeof(struct sadb_msg) +
3096                 (sizeof(struct sadb_address) * 2) +
3097                 (sockaddr_size * 2) +
3098                 sizeof(struct sadb_x_policy);
3099 
3100         if (x->id.proto == IPPROTO_AH)
3101                 size += count_ah_combs(t);
3102         else if (x->id.proto == IPPROTO_ESP)
3103                 size += count_esp_combs(t);
3104 
3105         if ((xfrm_ctx = x->security)) {
3106                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3107                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3108         }
3109 
3110         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3111         if (skb == NULL)
3112                 return -ENOMEM;
3113 
3114         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3115         hdr->sadb_msg_version = PF_KEY_V2;
3116         hdr->sadb_msg_type = SADB_ACQUIRE;
3117         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3118         hdr->sadb_msg_len = size / sizeof(uint64_t);
3119         hdr->sadb_msg_errno = 0;
3120         hdr->sadb_msg_reserved = 0;
3121         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3122         hdr->sadb_msg_pid = 0;
3123 
3124         /* src address */
3125         addr = (struct sadb_address*) skb_put(skb,
3126                                               sizeof(struct sadb_address)+sockaddr_size);
3127         addr->sadb_address_len =
3128                 (sizeof(struct sadb_address)+sockaddr_size)/
3129                         sizeof(uint64_t);
3130         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3131         addr->sadb_address_proto = 0;
3132         addr->sadb_address_reserved = 0;
3133         addr->sadb_address_prefixlen =
3134                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3135                                     (struct sockaddr *) (addr + 1),
3136                                     x->props.family);
3137         if (!addr->sadb_address_prefixlen)
3138                 BUG();
3139 
3140         /* dst address */
3141         addr = (struct sadb_address*) skb_put(skb,
3142                                               sizeof(struct sadb_address)+sockaddr_size);
3143         addr->sadb_address_len =
3144                 (sizeof(struct sadb_address)+sockaddr_size)/
3145                         sizeof(uint64_t);
3146         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3147         addr->sadb_address_proto = 0;
3148         addr->sadb_address_reserved = 0;
3149         addr->sadb_address_prefixlen =
3150                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3151                                     (struct sockaddr *) (addr + 1),
3152                                     x->props.family);
3153         if (!addr->sadb_address_prefixlen)
3154                 BUG();
3155 
3156         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3157         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3158         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3159         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3160         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3161         pol->sadb_x_policy_reserved = 0;
3162         pol->sadb_x_policy_id = xp->index;
3163         pol->sadb_x_policy_priority = xp->priority;
3164 
3165         /* Set sadb_comb's. */
3166         if (x->id.proto == IPPROTO_AH)
3167                 dump_ah_combs(skb, t);
3168         else if (x->id.proto == IPPROTO_ESP)
3169                 dump_esp_combs(skb, t);
3170 
3171         /* security context */
3172         if (xfrm_ctx) {
3173                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3174                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3175                 sec_ctx->sadb_x_sec_len =
3176                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3177                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3178                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3179                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3180                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3181                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3182                        xfrm_ctx->ctx_len);
3183         }
3184 
3185         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3186 }
3187 
3188 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3189                                                 u8 *data, int len, int *dir)
3190 {
3191         struct net *net = sock_net(sk);
3192         struct xfrm_policy *xp;
3193         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3194         struct sadb_x_sec_ctx *sec_ctx;
3195 
3196         switch (sk->sk_family) {
3197         case AF_INET:
3198                 if (opt != IP_IPSEC_POLICY) {
3199                         *dir = -EOPNOTSUPP;
3200                         return NULL;
3201                 }
3202                 break;
3203 #if IS_ENABLED(CONFIG_IPV6)
3204         case AF_INET6:
3205                 if (opt != IPV6_IPSEC_POLICY) {
3206                         *dir = -EOPNOTSUPP;
3207                         return NULL;
3208                 }
3209                 break;
3210 #endif
3211         default:
3212                 *dir = -EINVAL;
3213                 return NULL;
3214         }
3215 
3216         *dir = -EINVAL;
3217 
3218         if (len < sizeof(struct sadb_x_policy) ||
3219             pol->sadb_x_policy_len*8 > len ||
3220             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3221             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3222                 return NULL;
3223 
3224         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3225         if (xp == NULL) {
3226                 *dir = -ENOBUFS;
3227                 return NULL;
3228         }
3229 
3230         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3231                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3232 
3233         xp->lft.soft_byte_limit = XFRM_INF;
3234         xp->lft.hard_byte_limit = XFRM_INF;
3235         xp->lft.soft_packet_limit = XFRM_INF;
3236         xp->lft.hard_packet_limit = XFRM_INF;
3237         xp->family = sk->sk_family;
3238 
3239         xp->xfrm_nr = 0;
3240         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3241             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3242                 goto out;
3243 
3244         /* security context too */
3245         if (len >= (pol->sadb_x_policy_len*8 +
3246             sizeof(struct sadb_x_sec_ctx))) {
3247                 char *p = (char *)pol;
3248                 struct xfrm_user_sec_ctx *uctx;
3249 
3250                 p += pol->sadb_x_policy_len*8;
3251                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3252                 if (len < pol->sadb_x_policy_len*8 +
3253                     sec_ctx->sadb_x_sec_len) {
3254                         *dir = -EINVAL;
3255                         goto out;
3256                 }
3257                 if ((*dir = verify_sec_ctx_len(p)))
3258                         goto out;
3259                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3260                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3261                 kfree(uctx);
3262 
3263                 if (*dir)
3264                         goto out;
3265         }
3266 
3267         *dir = pol->sadb_x_policy_dir-1;
3268         return xp;
3269 
3270 out:
3271         xp->walk.dead = 1;
3272         xfrm_policy_destroy(xp);
3273         return NULL;
3274 }
3275 
3276 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3277 {
3278         struct sk_buff *skb;
3279         struct sadb_msg *hdr;
3280         struct sadb_sa *sa;
3281         struct sadb_address *addr;
3282         struct sadb_x_nat_t_port *n_port;
3283         int sockaddr_size;
3284         int size;
3285         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3286         struct xfrm_encap_tmpl *natt = NULL;
3287 
3288         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3289         if (!sockaddr_size)
3290                 return -EINVAL;
3291 
3292         if (!satype)
3293                 return -EINVAL;
3294 
3295         if (!x->encap)
3296                 return -EINVAL;
3297 
3298         natt = x->encap;
3299 
3300         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3301          *
3302          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3303          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3304          */
3305 
3306         size = sizeof(struct sadb_msg) +
3307                 sizeof(struct sadb_sa) +
3308                 (sizeof(struct sadb_address) * 2) +
3309                 (sockaddr_size * 2) +
3310                 (sizeof(struct sadb_x_nat_t_port) * 2);
3311 
3312         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3313         if (skb == NULL)
3314                 return -ENOMEM;
3315 
3316         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3317         hdr->sadb_msg_version = PF_KEY_V2;
3318         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3319         hdr->sadb_msg_satype = satype;
3320         hdr->sadb_msg_len = size / sizeof(uint64_t);
3321         hdr->sadb_msg_errno = 0;
3322         hdr->sadb_msg_reserved = 0;
3323         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3324         hdr->sadb_msg_pid = 0;
3325 
3326         /* SA */
3327         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3328         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3329         sa->sadb_sa_exttype = SADB_EXT_SA;
3330         sa->sadb_sa_spi = x->id.spi;
3331         sa->sadb_sa_replay = 0;
3332         sa->sadb_sa_state = 0;
3333         sa->sadb_sa_auth = 0;
3334         sa->sadb_sa_encrypt = 0;
3335         sa->sadb_sa_flags = 0;
3336 
3337         /* ADDRESS_SRC (old addr) */
3338         addr = (struct sadb_address*)
3339                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3340         addr->sadb_address_len =
3341                 (sizeof(struct sadb_address)+sockaddr_size)/
3342                         sizeof(uint64_t);
3343         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3344         addr->sadb_address_proto = 0;
3345         addr->sadb_address_reserved = 0;
3346         addr->sadb_address_prefixlen =
3347                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3348                                     (struct sockaddr *) (addr + 1),
3349                                     x->props.family);
3350         if (!addr->sadb_address_prefixlen)
3351                 BUG();
3352 
3353         /* NAT_T_SPORT (old port) */
3354         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3355         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3356         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3357         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3358         n_port->sadb_x_nat_t_port_reserved = 0;
3359 
3360         /* ADDRESS_DST (new addr) */
3361         addr = (struct sadb_address*)
3362                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3363         addr->sadb_address_len =
3364                 (sizeof(struct sadb_address)+sockaddr_size)/
3365                         sizeof(uint64_t);
3366         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3367         addr->sadb_address_proto = 0;
3368         addr->sadb_address_reserved = 0;
3369         addr->sadb_address_prefixlen =
3370                 pfkey_sockaddr_fill(ipaddr, 0,
3371                                     (struct sockaddr *) (addr + 1),
3372                                     x->props.family);
3373         if (!addr->sadb_address_prefixlen)
3374                 BUG();
3375 
3376         /* NAT_T_DPORT (new port) */
3377         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3378         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3379         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3380         n_port->sadb_x_nat_t_port_port = sport;
3381         n_port->sadb_x_nat_t_port_reserved = 0;
3382 
3383         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3384 }
3385 
3386 #ifdef CONFIG_NET_KEY_MIGRATE
3387 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3388                             const struct xfrm_selector *sel)
3389 {
3390         struct sadb_address *addr;
3391         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3392         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3393         addr->sadb_address_exttype = type;
3394         addr->sadb_address_proto = sel->proto;
3395         addr->sadb_address_reserved = 0;
3396 
3397         switch (type) {
3398         case SADB_EXT_ADDRESS_SRC:
3399                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3400                 pfkey_sockaddr_fill(&sel->saddr, 0,
3401                                     (struct sockaddr *)(addr + 1),
3402                                     sel->family);
3403                 break;
3404         case SADB_EXT_ADDRESS_DST:
3405                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3406                 pfkey_sockaddr_fill(&sel->daddr, 0,
3407                                     (struct sockaddr *)(addr + 1),
3408                                     sel->family);
3409                 break;
3410         default:
3411                 return -EINVAL;
3412         }
3413 
3414         return 0;
3415 }
3416 
3417 
3418 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3419 {
3420         struct sadb_x_kmaddress *kma;
3421         u8 *sa;
3422         int family = k->family;
3423         int socklen = pfkey_sockaddr_len(family);
3424         int size_req;
3425 
3426         size_req = (sizeof(struct sadb_x_kmaddress) +
3427                     pfkey_sockaddr_pair_size(family));
3428 
3429         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3430         memset(kma, 0, size_req);
3431         kma->sadb_x_kmaddress_len = size_req / 8;
3432         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3433         kma->sadb_x_kmaddress_reserved = k->reserved;
3434 
3435         sa = (u8 *)(kma + 1);
3436         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3437             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3438                 return -EINVAL;
3439 
3440         return 0;
3441 }
3442 
3443 static int set_ipsecrequest(struct sk_buff *skb,
3444                             uint8_t proto, uint8_t mode, int level,
3445                             uint32_t reqid, uint8_t family,
3446                             const xfrm_address_t *src, const xfrm_address_t *dst)
3447 {
3448         struct sadb_x_ipsecrequest *rq;
3449         u8 *sa;
3450         int socklen = pfkey_sockaddr_len(family);
3451         int size_req;
3452 
3453         size_req = sizeof(struct sadb_x_ipsecrequest) +
3454                    pfkey_sockaddr_pair_size(family);
3455 
3456         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3457         memset(rq, 0, size_req);
3458         rq->sadb_x_ipsecrequest_len = size_req;
3459         rq->sadb_x_ipsecrequest_proto = proto;
3460         rq->sadb_x_ipsecrequest_mode = mode;
3461         rq->sadb_x_ipsecrequest_level = level;
3462         rq->sadb_x_ipsecrequest_reqid = reqid;
3463 
3464         sa = (u8 *) (rq + 1);
3465         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3466             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3467                 return -EINVAL;
3468 
3469         return 0;
3470 }
3471 #endif
3472 
3473 #ifdef CONFIG_NET_KEY_MIGRATE
3474 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3475                               const struct xfrm_migrate *m, int num_bundles,
3476                               const struct xfrm_kmaddress *k)
3477 {
3478         int i;
3479         int sasize_sel;
3480         int size = 0;
3481         int size_pol = 0;
3482         struct sk_buff *skb;
3483         struct sadb_msg *hdr;
3484         struct sadb_x_policy *pol;
3485         const struct xfrm_migrate *mp;
3486 
3487         if (type != XFRM_POLICY_TYPE_MAIN)
3488                 return 0;
3489 
3490         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3491                 return -EINVAL;
3492 
3493         if (k != NULL) {
3494                 /* addresses for KM */
3495                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3496                                      pfkey_sockaddr_pair_size(k->family));
3497         }
3498 
3499         /* selector */
3500         sasize_sel = pfkey_sockaddr_size(sel->family);
3501         if (!sasize_sel)
3502                 return -EINVAL;
3503         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3504 
3505         /* policy info */
3506         size_pol += sizeof(struct sadb_x_policy);
3507 
3508         /* ipsecrequests */
3509         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3510                 /* old locator pair */
3511                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3512                             pfkey_sockaddr_pair_size(mp->old_family);
3513                 /* new locator pair */
3514                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3515                             pfkey_sockaddr_pair_size(mp->new_family);
3516         }
3517 
3518         size += sizeof(struct sadb_msg) + size_pol;
3519 
3520         /* alloc buffer */
3521         skb = alloc_skb(size, GFP_ATOMIC);
3522         if (skb == NULL)
3523                 return -ENOMEM;
3524 
3525         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3526         hdr->sadb_msg_version = PF_KEY_V2;
3527         hdr->sadb_msg_type = SADB_X_MIGRATE;
3528         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3529         hdr->sadb_msg_len = size / 8;
3530         hdr->sadb_msg_errno = 0;
3531         hdr->sadb_msg_reserved = 0;
3532         hdr->sadb_msg_seq = 0;
3533         hdr->sadb_msg_pid = 0;
3534 
3535         /* Addresses to be used by KM for negotiation, if ext is available */
3536         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3537                 goto err;
3538 
3539         /* selector src */
3540         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3541 
3542         /* selector dst */
3543         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3544 
3545         /* policy information */
3546         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3547         pol->sadb_x_policy_len = size_pol / 8;
3548         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3549         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3550         pol->sadb_x_policy_dir = dir + 1;
3551         pol->sadb_x_policy_reserved = 0;
3552         pol->sadb_x_policy_id = 0;
3553         pol->sadb_x_policy_priority = 0;
3554 
3555         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3556                 /* old ipsecrequest */
3557                 int mode = pfkey_mode_from_xfrm(mp->mode);
3558                 if (mode < 0)
3559                         goto err;
3560                 if (set_ipsecrequest(skb, mp->proto, mode,
3561                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3562                                      mp->reqid, mp->old_family,
3563                                      &mp->old_saddr, &mp->old_daddr) < 0)
3564                         goto err;
3565 
3566                 /* new ipsecrequest */
3567                 if (set_ipsecrequest(skb, mp->proto, mode,
3568                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3569                                      mp->reqid, mp->new_family,
3570                                      &mp->new_saddr, &mp->new_daddr) < 0)
3571                         goto err;
3572         }
3573 
3574         /* broadcast migrate message to sockets */
3575         pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3576 
3577         return 0;
3578 
3579 err:
3580         kfree_skb(skb);
3581         return -EINVAL;
3582 }
3583 #else
3584 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3585                               const struct xfrm_migrate *m, int num_bundles,
3586                               const struct xfrm_kmaddress *k)
3587 {
3588         return -ENOPROTOOPT;
3589 }
3590 #endif
3591 
3592 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3593 {
3594         struct sock *sk = sock->sk;
3595         struct sk_buff *skb = NULL;
3596         struct sadb_msg *hdr = NULL;
3597         int err;
3598         struct net *net = sock_net(sk);
3599 
3600         err = -EOPNOTSUPP;
3601         if (msg->msg_flags & MSG_OOB)
3602                 goto out;
3603 
3604         err = -EMSGSIZE;
3605         if ((unsigned int)len > sk->sk_sndbuf - 32)
3606                 goto out;
3607 
3608         err = -ENOBUFS;
3609         skb = alloc_skb(len, GFP_KERNEL);
3610         if (skb == NULL)
3611                 goto out;
3612 
3613         err = -EFAULT;
3614         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3615                 goto out;
3616 
3617         hdr = pfkey_get_base_msg(skb, &err);
3618         if (!hdr)
3619                 goto out;
3620 
3621         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3622         err = pfkey_process(sk, skb, hdr);
3623         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3624 
3625 out:
3626         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3627                 err = 0;
3628         kfree_skb(skb);
3629 
3630         return err ? : len;
3631 }
3632 
3633 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3634                          int flags)
3635 {
3636         struct sock *sk = sock->sk;
3637         struct pfkey_sock *pfk = pfkey_sk(sk);
3638         struct sk_buff *skb;
3639         int copied, err;
3640 
3641         err = -EINVAL;
3642         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3643                 goto out;
3644 
3645         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3646         if (skb == NULL)
3647                 goto out;
3648 
3649         copied = skb->len;
3650         if (copied > len) {
3651                 msg->msg_flags |= MSG_TRUNC;
3652                 copied = len;
3653         }
3654 
3655         skb_reset_transport_header(skb);
3656         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3657         if (err)
3658                 goto out_free;
3659 
3660         sock_recv_ts_and_drops(msg, sk, skb);
3661 
3662         err = (flags & MSG_TRUNC) ? skb->len : copied;
3663 
3664         if (pfk->dump.dump != NULL &&
3665             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3666                 pfkey_do_dump(pfk);
3667 
3668 out_free:
3669         skb_free_datagram(sk, skb);
3670 out:
3671         return err;
3672 }
3673 
3674 static const struct proto_ops pfkey_ops = {
3675         .family         =       PF_KEY,
3676         .owner          =       THIS_MODULE,
3677         /* Operations that make no sense on pfkey sockets. */
3678         .bind           =       sock_no_bind,
3679         .connect        =       sock_no_connect,
3680         .socketpair     =       sock_no_socketpair,
3681         .accept         =       sock_no_accept,
3682         .getname        =       sock_no_getname,
3683         .ioctl          =       sock_no_ioctl,
3684         .listen         =       sock_no_listen,
3685         .shutdown       =       sock_no_shutdown,
3686         .setsockopt     =       sock_no_setsockopt,
3687         .getsockopt     =       sock_no_getsockopt,
3688         .mmap           =       sock_no_mmap,
3689         .sendpage       =       sock_no_sendpage,
3690 
3691         /* Now the operations that really occur. */
3692         .release        =       pfkey_release,
3693         .poll           =       datagram_poll,
3694         .sendmsg        =       pfkey_sendmsg,
3695         .recvmsg        =       pfkey_recvmsg,
3696 };
3697 
3698 static const struct net_proto_family pfkey_family_ops = {
3699         .family =       PF_KEY,
3700         .create =       pfkey_create,
3701         .owner  =       THIS_MODULE,
3702 };
3703 
3704 #ifdef CONFIG_PROC_FS
3705 static int pfkey_seq_show(struct seq_file *f, void *v)
3706 {
3707         struct sock *s = sk_entry(v);
3708 
3709         if (v == SEQ_START_TOKEN)
3710                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3711         else
3712                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3713                                s,
3714                                atomic_read(&s->sk_refcnt),
3715                                sk_rmem_alloc_get(s),
3716                                sk_wmem_alloc_get(s),
3717                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3718                                sock_i_ino(s)
3719                                );
3720         return 0;
3721 }
3722 
3723 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3724         __acquires(rcu)
3725 {
3726         struct net *net = seq_file_net(f);
3727         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3728 
3729         rcu_read_lock();
3730         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3731 }
3732 
3733 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3734 {
3735         struct net *net = seq_file_net(f);
3736         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3737 
3738         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3739 }
3740 
3741 static void pfkey_seq_stop(struct seq_file *f, void *v)
3742         __releases(rcu)
3743 {
3744         rcu_read_unlock();
3745 }
3746 
3747 static const struct seq_operations pfkey_seq_ops = {
3748         .start  = pfkey_seq_start,
3749         .next   = pfkey_seq_next,
3750         .stop   = pfkey_seq_stop,
3751         .show   = pfkey_seq_show,
3752 };
3753 
3754 static int pfkey_seq_open(struct inode *inode, struct file *file)
3755 {
3756         return seq_open_net(inode, file, &pfkey_seq_ops,
3757                             sizeof(struct seq_net_private));
3758 }
3759 
3760 static const struct file_operations pfkey_proc_ops = {
3761         .open    = pfkey_seq_open,
3762         .read    = seq_read,
3763         .llseek  = seq_lseek,
3764         .release = seq_release_net,
3765 };
3766 
3767 static int __net_init pfkey_init_proc(struct net *net)
3768 {
3769         struct proc_dir_entry *e;
3770 
3771         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3772         if (e == NULL)
3773                 return -ENOMEM;
3774 
3775         return 0;
3776 }
3777 
3778 static void __net_exit pfkey_exit_proc(struct net *net)
3779 {
3780         remove_proc_entry("pfkey", net->proc_net);
3781 }
3782 #else
3783 static inline int pfkey_init_proc(struct net *net)
3784 {
3785         return 0;
3786 }
3787 
3788 static inline void pfkey_exit_proc(struct net *net)
3789 {
3790 }
3791 #endif
3792 
3793 static struct xfrm_mgr pfkeyv2_mgr =
3794 {
3795         .id             = "pfkeyv2",
3796         .notify         = pfkey_send_notify,
3797         .acquire        = pfkey_send_acquire,
3798         .compile_policy = pfkey_compile_policy,
3799         .new_mapping    = pfkey_send_new_mapping,
3800         .notify_policy  = pfkey_send_policy_notify,
3801         .migrate        = pfkey_send_migrate,
3802         .is_alive       = pfkey_is_alive,
3803 };
3804 
3805 static int __net_init pfkey_net_init(struct net *net)
3806 {
3807         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3808         int rv;
3809 
3810         INIT_HLIST_HEAD(&net_pfkey->table);
3811         atomic_set(&net_pfkey->socks_nr, 0);
3812 
3813         rv = pfkey_init_proc(net);
3814 
3815         return rv;
3816 }
3817 
3818 static void __net_exit pfkey_net_exit(struct net *net)
3819 {
3820         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3821 
3822         pfkey_exit_proc(net);
3823         BUG_ON(!hlist_empty(&net_pfkey->table));
3824 }
3825 
3826 static struct pernet_operations pfkey_net_ops = {
3827         .init = pfkey_net_init,
3828         .exit = pfkey_net_exit,
3829         .id   = &pfkey_net_id,
3830         .size = sizeof(struct netns_pfkey),
3831 };
3832 
3833 static void __exit ipsec_pfkey_exit(void)
3834 {
3835         xfrm_unregister_km(&pfkeyv2_mgr);
3836         sock_unregister(PF_KEY);
3837         unregister_pernet_subsys(&pfkey_net_ops);
3838         proto_unregister(&key_proto);
3839 }
3840 
3841 static int __init ipsec_pfkey_init(void)
3842 {
3843         int err = proto_register(&key_proto, 0);
3844 
3845         if (err != 0)
3846                 goto out;
3847 
3848         err = register_pernet_subsys(&pfkey_net_ops);
3849         if (err != 0)
3850                 goto out_unregister_key_proto;
3851         err = sock_register(&pfkey_family_ops);
3852         if (err != 0)
3853                 goto out_unregister_pernet;
3854         err = xfrm_register_km(&pfkeyv2_mgr);
3855         if (err != 0)
3856                 goto out_sock_unregister;
3857 out:
3858         return err;
3859 
3860 out_sock_unregister:
3861         sock_unregister(PF_KEY);
3862 out_unregister_pernet:
3863         unregister_pernet_subsys(&pfkey_net_ops);
3864 out_unregister_key_proto:
3865         proto_unregister(&key_proto);
3866         goto out;
3867 }
3868 
3869 module_init(ipsec_pfkey_init);
3870 module_exit(ipsec_pfkey_exit);
3871 MODULE_LICENSE("GPL");
3872 MODULE_ALIAS_NETPROTO(PF_KEY);
3873 

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