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Linux/net/key/af_key.c

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  1 /*
  2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
 10  *              David S. Miller <davem@redhat.com>
 11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
 14  *              Derek Atkins <derek@ihtfp.com>
 15  */
 16 
 17 #include <linux/capability.h>
 18 #include <linux/module.h>
 19 #include <linux/kernel.h>
 20 #include <linux/socket.h>
 21 #include <linux/pfkeyv2.h>
 22 #include <linux/ipsec.h>
 23 #include <linux/skbuff.h>
 24 #include <linux/rtnetlink.h>
 25 #include <linux/in.h>
 26 #include <linux/in6.h>
 27 #include <linux/proc_fs.h>
 28 #include <linux/init.h>
 29 #include <linux/slab.h>
 30 #include <net/net_namespace.h>
 31 #include <net/netns/generic.h>
 32 #include <net/xfrm.h>
 33 
 34 #include <net/sock.h>
 35 
 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
 38 
 39 static int pfkey_net_id __read_mostly;
 40 struct netns_pfkey {
 41         /* List of all pfkey sockets. */
 42         struct hlist_head table;
 43         atomic_t socks_nr;
 44 };
 45 static DEFINE_MUTEX(pfkey_mutex);
 46 
 47 #define DUMMY_MARK 0
 48 static 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);
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, gfp_t allocation,
223                            int broadcast_flags, struct sock *one_sk,
224                            struct net *net)
225 {
226         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
227         struct sock *sk;
228         struct sk_buff *skb2 = NULL;
229         int err = -ESRCH;
230 
231         /* XXX Do we need something like netlink_overrun?  I think
232          * XXX PF_KEY socket apps will not mind current behavior.
233          */
234         if (!skb)
235                 return -ENOMEM;
236 
237         rcu_read_lock();
238         sk_for_each_rcu(sk, &net_pfkey->table) {
239                 struct pfkey_sock *pfk = pfkey_sk(sk);
240                 int err2;
241 
242                 /* Yes, it means that if you are meant to receive this
243                  * pfkey message you receive it twice as promiscuous
244                  * socket.
245                  */
246                 if (pfk->promisc)
247                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
248 
249                 /* the exact target will be processed later */
250                 if (sk == one_sk)
251                         continue;
252                 if (broadcast_flags != BROADCAST_ALL) {
253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
254                                 continue;
255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
256                             !pfk->registered)
257                                 continue;
258                         if (broadcast_flags & BROADCAST_ONE)
259                                 continue;
260                 }
261 
262                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
263 
264                 /* Error is cleare after succecful sending to at least one
265                  * registered KM */
266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
267                         err = err2;
268         }
269         rcu_read_unlock();
270 
271         if (one_sk != NULL)
272                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
273 
274         kfree_skb(skb2);
275         kfree_skb(skb);
276         return err;
277 }
278 
279 static int pfkey_do_dump(struct pfkey_sock *pfk)
280 {
281         struct sadb_msg *hdr;
282         int rc;
283 
284         rc = pfk->dump.dump(pfk);
285         if (rc == -ENOBUFS)
286                 return 0;
287 
288         if (pfk->dump.skb) {
289                 if (!pfkey_can_dump(&pfk->sk))
290                         return 0;
291 
292                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
293                 hdr->sadb_msg_seq = 0;
294                 hdr->sadb_msg_errno = rc;
295                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
296                                 &pfk->sk, sock_net(&pfk->sk));
297                 pfk->dump.skb = NULL;
298         }
299 
300         pfkey_terminate_dump(pfk);
301         return rc;
302 }
303 
304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
305                                  const struct sadb_msg *orig)
306 {
307         *new = *orig;
308 }
309 
310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
311 {
312         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
313         struct sadb_msg *hdr;
314 
315         if (!skb)
316                 return -ENOBUFS;
317 
318         /* Woe be to the platform trying to support PFKEY yet
319          * having normal errnos outside the 1-255 range, inclusive.
320          */
321         err = -err;
322         if (err == ERESTARTSYS ||
323             err == ERESTARTNOHAND ||
324             err == ERESTARTNOINTR)
325                 err = EINTR;
326         if (err >= 512)
327                 err = EINVAL;
328         BUG_ON(err <= 0 || err >= 256);
329 
330         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
331         pfkey_hdr_dup(hdr, orig);
332         hdr->sadb_msg_errno = (uint8_t) err;
333         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
334                              sizeof(uint64_t));
335 
336         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
337 
338         return 0;
339 }
340 
341 static 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 = *(struct in6_addr *)xaddr->a6;
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                 }
1194         }
1195         /* x->algo.flags = sa->sadb_sa_flags; */
1196 
1197         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198                                                     &x->props.saddr);
1199         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1200                                   &x->id.daddr);
1201 
1202         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1203                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1204                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1205                 if (mode < 0) {
1206                         err = -EINVAL;
1207                         goto out;
1208                 }
1209                 x->props.mode = mode;
1210                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1211         }
1212 
1213         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1214                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1215 
1216                 /* Nobody uses this, but we try. */
1217                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1218                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1219         }
1220 
1221         if (!x->sel.family)
1222                 x->sel.family = x->props.family;
1223 
1224         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1225                 const struct sadb_x_nat_t_type* n_type;
1226                 struct xfrm_encap_tmpl *natt;
1227 
1228                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1229                 if (!x->encap)
1230                         goto out;
1231 
1232                 natt = x->encap;
1233                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1234                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1235 
1236                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1237                         const struct sadb_x_nat_t_port *n_port =
1238                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1239                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1240                 }
1241                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1242                         const struct sadb_x_nat_t_port *n_port =
1243                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1244                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1245                 }
1246                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1247         }
1248 
1249         err = xfrm_init_state(x);
1250         if (err)
1251                 goto out;
1252 
1253         x->km.seq = hdr->sadb_msg_seq;
1254         return x;
1255 
1256 out:
1257         x->km.state = XFRM_STATE_DEAD;
1258         xfrm_state_put(x);
1259         return ERR_PTR(err);
1260 }
1261 
1262 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1263 {
1264         return -EOPNOTSUPP;
1265 }
1266 
1267 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1268 {
1269         struct net *net = sock_net(sk);
1270         struct sk_buff *resp_skb;
1271         struct sadb_x_sa2 *sa2;
1272         struct sadb_address *saddr, *daddr;
1273         struct sadb_msg *out_hdr;
1274         struct sadb_spirange *range;
1275         struct xfrm_state *x = NULL;
1276         int mode;
1277         int err;
1278         u32 min_spi, max_spi;
1279         u32 reqid;
1280         u8 proto;
1281         unsigned short family;
1282         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1283 
1284         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1285                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1286                 return -EINVAL;
1287 
1288         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1289         if (proto == 0)
1290                 return -EINVAL;
1291 
1292         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1293                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1294                 if (mode < 0)
1295                         return -EINVAL;
1296                 reqid = sa2->sadb_x_sa2_reqid;
1297         } else {
1298                 mode = 0;
1299                 reqid = 0;
1300         }
1301 
1302         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1303         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1304 
1305         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1306         switch (family) {
1307         case AF_INET:
1308                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1309                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1310                 break;
1311 #if IS_ENABLED(CONFIG_IPV6)
1312         case AF_INET6:
1313                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1314                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1315                 break;
1316 #endif
1317         }
1318 
1319         if (hdr->sadb_msg_seq) {
1320                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1321                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1322                         xfrm_state_put(x);
1323                         x = NULL;
1324                 }
1325         }
1326 
1327         if (!x)
1328                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1329 
1330         if (x == NULL)
1331                 return -ENOENT;
1332 
1333         min_spi = 0x100;
1334         max_spi = 0x0fffffff;
1335 
1336         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1337         if (range) {
1338                 min_spi = range->sadb_spirange_min;
1339                 max_spi = range->sadb_spirange_max;
1340         }
1341 
1342         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1343         if (err) {
1344                 xfrm_state_put(x);
1345                 return err;
1346         }
1347 
1348         err = xfrm_alloc_spi(x, min_spi, max_spi);
1349         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1350 
1351         if (IS_ERR(resp_skb)) {
1352                 xfrm_state_put(x);
1353                 return  PTR_ERR(resp_skb);
1354         }
1355 
1356         out_hdr = (struct sadb_msg *) resp_skb->data;
1357         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1358         out_hdr->sadb_msg_type = SADB_GETSPI;
1359         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1360         out_hdr->sadb_msg_errno = 0;
1361         out_hdr->sadb_msg_reserved = 0;
1362         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1363         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1364 
1365         xfrm_state_put(x);
1366 
1367         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1368 
1369         return 0;
1370 }
1371 
1372 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1373 {
1374         struct net *net = sock_net(sk);
1375         struct xfrm_state *x;
1376 
1377         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1378                 return -EOPNOTSUPP;
1379 
1380         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1381                 return 0;
1382 
1383         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1384         if (x == NULL)
1385                 return 0;
1386 
1387         spin_lock_bh(&x->lock);
1388         if (x->km.state == XFRM_STATE_ACQ)
1389                 x->km.state = XFRM_STATE_ERROR;
1390 
1391         spin_unlock_bh(&x->lock);
1392         xfrm_state_put(x);
1393         return 0;
1394 }
1395 
1396 static inline int event2poltype(int event)
1397 {
1398         switch (event) {
1399         case XFRM_MSG_DELPOLICY:
1400                 return SADB_X_SPDDELETE;
1401         case XFRM_MSG_NEWPOLICY:
1402                 return SADB_X_SPDADD;
1403         case XFRM_MSG_UPDPOLICY:
1404                 return SADB_X_SPDUPDATE;
1405         case XFRM_MSG_POLEXPIRE:
1406         //      return SADB_X_SPDEXPIRE;
1407         default:
1408                 pr_err("pfkey: Unknown policy event %d\n", event);
1409                 break;
1410         }
1411 
1412         return 0;
1413 }
1414 
1415 static inline int event2keytype(int event)
1416 {
1417         switch (event) {
1418         case XFRM_MSG_DELSA:
1419                 return SADB_DELETE;
1420         case XFRM_MSG_NEWSA:
1421                 return SADB_ADD;
1422         case XFRM_MSG_UPDSA:
1423                 return SADB_UPDATE;
1424         case XFRM_MSG_EXPIRE:
1425                 return SADB_EXPIRE;
1426         default:
1427                 pr_err("pfkey: Unknown SA event %d\n", event);
1428                 break;
1429         }
1430 
1431         return 0;
1432 }
1433 
1434 /* ADD/UPD/DEL */
1435 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1436 {
1437         struct sk_buff *skb;
1438         struct sadb_msg *hdr;
1439 
1440         skb = pfkey_xfrm_state2msg(x);
1441 
1442         if (IS_ERR(skb))
1443                 return PTR_ERR(skb);
1444 
1445         hdr = (struct sadb_msg *) skb->data;
1446         hdr->sadb_msg_version = PF_KEY_V2;
1447         hdr->sadb_msg_type = event2keytype(c->event);
1448         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1449         hdr->sadb_msg_errno = 0;
1450         hdr->sadb_msg_reserved = 0;
1451         hdr->sadb_msg_seq = c->seq;
1452         hdr->sadb_msg_pid = c->portid;
1453 
1454         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1455 
1456         return 0;
1457 }
1458 
1459 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1460 {
1461         struct net *net = sock_net(sk);
1462         struct xfrm_state *x;
1463         int err;
1464         struct km_event c;
1465 
1466         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1467         if (IS_ERR(x))
1468                 return PTR_ERR(x);
1469 
1470         xfrm_state_hold(x);
1471         if (hdr->sadb_msg_type == SADB_ADD)
1472                 err = xfrm_state_add(x);
1473         else
1474                 err = xfrm_state_update(x);
1475 
1476         xfrm_audit_state_add(x, err ? 0 : 1, true);
1477 
1478         if (err < 0) {
1479                 x->km.state = XFRM_STATE_DEAD;
1480                 __xfrm_state_put(x);
1481                 goto out;
1482         }
1483 
1484         if (hdr->sadb_msg_type == SADB_ADD)
1485                 c.event = XFRM_MSG_NEWSA;
1486         else
1487                 c.event = XFRM_MSG_UPDSA;
1488         c.seq = hdr->sadb_msg_seq;
1489         c.portid = hdr->sadb_msg_pid;
1490         km_state_notify(x, &c);
1491 out:
1492         xfrm_state_put(x);
1493         return err;
1494 }
1495 
1496 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1497 {
1498         struct net *net = sock_net(sk);
1499         struct xfrm_state *x;
1500         struct km_event c;
1501         int err;
1502 
1503         if (!ext_hdrs[SADB_EXT_SA-1] ||
1504             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506                 return -EINVAL;
1507 
1508         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1509         if (x == NULL)
1510                 return -ESRCH;
1511 
1512         if ((err = security_xfrm_state_delete(x)))
1513                 goto out;
1514 
1515         if (xfrm_state_kern(x)) {
1516                 err = -EPERM;
1517                 goto out;
1518         }
1519 
1520         err = xfrm_state_delete(x);
1521 
1522         if (err < 0)
1523                 goto out;
1524 
1525         c.seq = hdr->sadb_msg_seq;
1526         c.portid = hdr->sadb_msg_pid;
1527         c.event = XFRM_MSG_DELSA;
1528         km_state_notify(x, &c);
1529 out:
1530         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1531         xfrm_state_put(x);
1532 
1533         return err;
1534 }
1535 
1536 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1537 {
1538         struct net *net = sock_net(sk);
1539         __u8 proto;
1540         struct sk_buff *out_skb;
1541         struct sadb_msg *out_hdr;
1542         struct xfrm_state *x;
1543 
1544         if (!ext_hdrs[SADB_EXT_SA-1] ||
1545             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1546                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1547                 return -EINVAL;
1548 
1549         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1550         if (x == NULL)
1551                 return -ESRCH;
1552 
1553         out_skb = pfkey_xfrm_state2msg(x);
1554         proto = x->id.proto;
1555         xfrm_state_put(x);
1556         if (IS_ERR(out_skb))
1557                 return  PTR_ERR(out_skb);
1558 
1559         out_hdr = (struct sadb_msg *) out_skb->data;
1560         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561         out_hdr->sadb_msg_type = SADB_GET;
1562         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1563         out_hdr->sadb_msg_errno = 0;
1564         out_hdr->sadb_msg_reserved = 0;
1565         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1566         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1567         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1568 
1569         return 0;
1570 }
1571 
1572 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1573                                               gfp_t allocation)
1574 {
1575         struct sk_buff *skb;
1576         struct sadb_msg *hdr;
1577         int len, auth_len, enc_len, i;
1578 
1579         auth_len = xfrm_count_pfkey_auth_supported();
1580         if (auth_len) {
1581                 auth_len *= sizeof(struct sadb_alg);
1582                 auth_len += sizeof(struct sadb_supported);
1583         }
1584 
1585         enc_len = xfrm_count_pfkey_enc_supported();
1586         if (enc_len) {
1587                 enc_len *= sizeof(struct sadb_alg);
1588                 enc_len += sizeof(struct sadb_supported);
1589         }
1590 
1591         len = enc_len + auth_len + sizeof(struct sadb_msg);
1592 
1593         skb = alloc_skb(len + 16, allocation);
1594         if (!skb)
1595                 goto out_put_algs;
1596 
1597         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1598         pfkey_hdr_dup(hdr, orig);
1599         hdr->sadb_msg_errno = 0;
1600         hdr->sadb_msg_len = len / sizeof(uint64_t);
1601 
1602         if (auth_len) {
1603                 struct sadb_supported *sp;
1604                 struct sadb_alg *ap;
1605 
1606                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1607                 ap = (struct sadb_alg *) (sp + 1);
1608 
1609                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1610                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1611 
1612                 for (i = 0; ; i++) {
1613                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1614                         if (!aalg)
1615                                 break;
1616                         if (!aalg->pfkey_supported)
1617                                 continue;
1618                         if (aalg->available)
1619                                 *ap++ = aalg->desc;
1620                 }
1621         }
1622 
1623         if (enc_len) {
1624                 struct sadb_supported *sp;
1625                 struct sadb_alg *ap;
1626 
1627                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628                 ap = (struct sadb_alg *) (sp + 1);
1629 
1630                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632 
1633                 for (i = 0; ; i++) {
1634                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635                         if (!ealg)
1636                                 break;
1637                         if (!ealg->pfkey_supported)
1638                                 continue;
1639                         if (ealg->available)
1640                                 *ap++ = ealg->desc;
1641                 }
1642         }
1643 
1644 out_put_algs:
1645         return skb;
1646 }
1647 
1648 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1649 {
1650         struct pfkey_sock *pfk = pfkey_sk(sk);
1651         struct sk_buff *supp_skb;
1652 
1653         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1654                 return -EINVAL;
1655 
1656         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1657                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1658                         return -EEXIST;
1659                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1660         }
1661 
1662         xfrm_probe_algs();
1663 
1664         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1665         if (!supp_skb) {
1666                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1667                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1668 
1669                 return -ENOBUFS;
1670         }
1671 
1672         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1673 
1674         return 0;
1675 }
1676 
1677 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1678 {
1679         struct sk_buff *skb;
1680         struct sadb_msg *hdr;
1681 
1682         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1683         if (!skb)
1684                 return -ENOBUFS;
1685 
1686         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1687         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1688         hdr->sadb_msg_errno = (uint8_t) 0;
1689         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1690 
1691         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1692 }
1693 
1694 static int key_notify_sa_flush(const struct km_event *c)
1695 {
1696         struct sk_buff *skb;
1697         struct sadb_msg *hdr;
1698 
1699         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1700         if (!skb)
1701                 return -ENOBUFS;
1702         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1703         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1704         hdr->sadb_msg_type = SADB_FLUSH;
1705         hdr->sadb_msg_seq = c->seq;
1706         hdr->sadb_msg_pid = c->portid;
1707         hdr->sadb_msg_version = PF_KEY_V2;
1708         hdr->sadb_msg_errno = (uint8_t) 0;
1709         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1710         hdr->sadb_msg_reserved = 0;
1711 
1712         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1713 
1714         return 0;
1715 }
1716 
1717 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1718 {
1719         struct net *net = sock_net(sk);
1720         unsigned int proto;
1721         struct km_event c;
1722         int err, err2;
1723 
1724         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1725         if (proto == 0)
1726                 return -EINVAL;
1727 
1728         err = xfrm_state_flush(net, proto, true);
1729         err2 = unicast_flush_resp(sk, hdr);
1730         if (err || err2) {
1731                 if (err == -ESRCH) /* empty table - go quietly */
1732                         err = 0;
1733                 return err ? err : err2;
1734         }
1735 
1736         c.data.proto = proto;
1737         c.seq = hdr->sadb_msg_seq;
1738         c.portid = hdr->sadb_msg_pid;
1739         c.event = XFRM_MSG_FLUSHSA;
1740         c.net = net;
1741         km_state_notify(NULL, &c);
1742 
1743         return 0;
1744 }
1745 
1746 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1747 {
1748         struct pfkey_sock *pfk = ptr;
1749         struct sk_buff *out_skb;
1750         struct sadb_msg *out_hdr;
1751 
1752         if (!pfkey_can_dump(&pfk->sk))
1753                 return -ENOBUFS;
1754 
1755         out_skb = pfkey_xfrm_state2msg(x);
1756         if (IS_ERR(out_skb))
1757                 return PTR_ERR(out_skb);
1758 
1759         out_hdr = (struct sadb_msg *) out_skb->data;
1760         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1761         out_hdr->sadb_msg_type = SADB_DUMP;
1762         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1763         out_hdr->sadb_msg_errno = 0;
1764         out_hdr->sadb_msg_reserved = 0;
1765         out_hdr->sadb_msg_seq = count + 1;
1766         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1767 
1768         if (pfk->dump.skb)
1769                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1770                                 &pfk->sk, sock_net(&pfk->sk));
1771         pfk->dump.skb = out_skb;
1772 
1773         return 0;
1774 }
1775 
1776 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1777 {
1778         struct net *net = sock_net(&pfk->sk);
1779         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1780 }
1781 
1782 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1783 {
1784         struct net *net = sock_net(&pfk->sk);
1785 
1786         xfrm_state_walk_done(&pfk->dump.u.state, net);
1787 }
1788 
1789 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1790 {
1791         u8 proto;
1792         struct xfrm_address_filter *filter = NULL;
1793         struct pfkey_sock *pfk = pfkey_sk(sk);
1794 
1795         if (pfk->dump.dump != NULL)
1796                 return -EBUSY;
1797 
1798         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1799         if (proto == 0)
1800                 return -EINVAL;
1801 
1802         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1803                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1804 
1805                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1806                 if (filter == NULL)
1807                         return -ENOMEM;
1808 
1809                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1810                        sizeof(xfrm_address_t));
1811                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1812                        sizeof(xfrm_address_t));
1813                 filter->family = xfilter->sadb_x_filter_family;
1814                 filter->splen = xfilter->sadb_x_filter_splen;
1815                 filter->dplen = xfilter->sadb_x_filter_dplen;
1816         }
1817 
1818         pfk->dump.msg_version = hdr->sadb_msg_version;
1819         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1820         pfk->dump.dump = pfkey_dump_sa;
1821         pfk->dump.done = pfkey_dump_sa_done;
1822         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1823 
1824         return pfkey_do_dump(pfk);
1825 }
1826 
1827 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1828 {
1829         struct pfkey_sock *pfk = pfkey_sk(sk);
1830         int satype = hdr->sadb_msg_satype;
1831         bool reset_errno = false;
1832 
1833         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1834                 reset_errno = true;
1835                 if (satype != 0 && satype != 1)
1836                         return -EINVAL;
1837                 pfk->promisc = satype;
1838         }
1839         if (reset_errno && skb_cloned(skb))
1840                 skb = skb_copy(skb, GFP_KERNEL);
1841         else
1842                 skb = skb_clone(skb, GFP_KERNEL);
1843 
1844         if (reset_errno && skb) {
1845                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1846                 new_hdr->sadb_msg_errno = 0;
1847         }
1848 
1849         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1850         return 0;
1851 }
1852 
1853 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1854 {
1855         int i;
1856         u32 reqid = *(u32*)ptr;
1857 
1858         for (i=0; i<xp->xfrm_nr; i++) {
1859                 if (xp->xfrm_vec[i].reqid == reqid)
1860                         return -EEXIST;
1861         }
1862         return 0;
1863 }
1864 
1865 static u32 gen_reqid(struct net *net)
1866 {
1867         struct xfrm_policy_walk walk;
1868         u32 start;
1869         int rc;
1870         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1871 
1872         start = reqid;
1873         do {
1874                 ++reqid;
1875                 if (reqid == 0)
1876                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1877                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1878                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1879                 xfrm_policy_walk_done(&walk, net);
1880                 if (rc != -EEXIST)
1881                         return reqid;
1882         } while (reqid != start);
1883         return 0;
1884 }
1885 
1886 static int
1887 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1888 {
1889         struct net *net = xp_net(xp);
1890         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1891         int mode;
1892 
1893         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1894                 return -ELOOP;
1895 
1896         if (rq->sadb_x_ipsecrequest_mode == 0)
1897                 return -EINVAL;
1898 
1899         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1900         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1901                 return -EINVAL;
1902         t->mode = mode;
1903         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1904                 t->optional = 1;
1905         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1906                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1907                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1908                         t->reqid = 0;
1909                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1910                         return -ENOBUFS;
1911         }
1912 
1913         /* addresses present only in tunnel mode */
1914         if (t->mode == XFRM_MODE_TUNNEL) {
1915                 u8 *sa = (u8 *) (rq + 1);
1916                 int family, socklen;
1917 
1918                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1919                                                 &t->saddr);
1920                 if (!family)
1921                         return -EINVAL;
1922 
1923                 socklen = pfkey_sockaddr_len(family);
1924                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1925                                            &t->id.daddr) != family)
1926                         return -EINVAL;
1927                 t->encap_family = family;
1928         } else
1929                 t->encap_family = xp->family;
1930 
1931         /* No way to set this via kame pfkey */
1932         t->allalgs = 1;
1933         xp->xfrm_nr++;
1934         return 0;
1935 }
1936 
1937 static int
1938 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1939 {
1940         int err;
1941         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1942         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1943 
1944         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1945                 return -EINVAL;
1946 
1947         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1948                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1949                         return err;
1950                 len -= rq->sadb_x_ipsecrequest_len;
1951                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1952         }
1953         return 0;
1954 }
1955 
1956 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1957 {
1958   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1959 
1960         if (xfrm_ctx) {
1961                 int len = sizeof(struct sadb_x_sec_ctx);
1962                 len += xfrm_ctx->ctx_len;
1963                 return PFKEY_ALIGN8(len);
1964         }
1965         return 0;
1966 }
1967 
1968 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1969 {
1970         const struct xfrm_tmpl *t;
1971         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1972         int socklen = 0;
1973         int i;
1974 
1975         for (i=0; i<xp->xfrm_nr; i++) {
1976                 t = xp->xfrm_vec + i;
1977                 socklen += pfkey_sockaddr_len(t->encap_family);
1978         }
1979 
1980         return sizeof(struct sadb_msg) +
1981                 (sizeof(struct sadb_lifetime) * 3) +
1982                 (sizeof(struct sadb_address) * 2) +
1983                 (sockaddr_size * 2) +
1984                 sizeof(struct sadb_x_policy) +
1985                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1986                 (socklen * 2) +
1987                 pfkey_xfrm_policy2sec_ctx_size(xp);
1988 }
1989 
1990 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1991 {
1992         struct sk_buff *skb;
1993         int size;
1994 
1995         size = pfkey_xfrm_policy2msg_size(xp);
1996 
1997         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1998         if (skb == NULL)
1999                 return ERR_PTR(-ENOBUFS);
2000 
2001         return skb;
2002 }
2003 
2004 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2005 {
2006         struct sadb_msg *hdr;
2007         struct sadb_address *addr;
2008         struct sadb_lifetime *lifetime;
2009         struct sadb_x_policy *pol;
2010         struct sadb_x_sec_ctx *sec_ctx;
2011         struct xfrm_sec_ctx *xfrm_ctx;
2012         int i;
2013         int size;
2014         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2015         int socklen = pfkey_sockaddr_len(xp->family);
2016 
2017         size = pfkey_xfrm_policy2msg_size(xp);
2018 
2019         /* call should fill header later */
2020         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2021         memset(hdr, 0, size);   /* XXX do we need this ? */
2022 
2023         /* src address */
2024         addr = (struct sadb_address*) skb_put(skb,
2025                                               sizeof(struct sadb_address)+sockaddr_size);
2026         addr->sadb_address_len =
2027                 (sizeof(struct sadb_address)+sockaddr_size)/
2028                         sizeof(uint64_t);
2029         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2030         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2031         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2032         addr->sadb_address_reserved = 0;
2033         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2034                                  xp->selector.sport,
2035                                  (struct sockaddr *) (addr + 1),
2036                                  xp->family))
2037                 BUG();
2038 
2039         /* dst address */
2040         addr = (struct sadb_address*) skb_put(skb,
2041                                               sizeof(struct sadb_address)+sockaddr_size);
2042         addr->sadb_address_len =
2043                 (sizeof(struct sadb_address)+sockaddr_size)/
2044                         sizeof(uint64_t);
2045         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2046         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2047         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2048         addr->sadb_address_reserved = 0;
2049 
2050         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2051                             (struct sockaddr *) (addr + 1),
2052                             xp->family);
2053 
2054         /* hard time */
2055         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2056                                                      sizeof(struct sadb_lifetime));
2057         lifetime->sadb_lifetime_len =
2058                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2059         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2060         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2061         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2062         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2063         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2064         /* soft time */
2065         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2066                                                      sizeof(struct sadb_lifetime));
2067         lifetime->sadb_lifetime_len =
2068                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2069         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2070         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2071         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2072         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2073         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2074         /* current time */
2075         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2076                                                      sizeof(struct sadb_lifetime));
2077         lifetime->sadb_lifetime_len =
2078                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2079         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2080         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2081         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2082         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2083         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2084 
2085         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2086         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2087         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2088         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2089         if (xp->action == XFRM_POLICY_ALLOW) {
2090                 if (xp->xfrm_nr)
2091                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2092                 else
2093                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2094         }
2095         pol->sadb_x_policy_dir = dir+1;
2096         pol->sadb_x_policy_reserved = 0;
2097         pol->sadb_x_policy_id = xp->index;
2098         pol->sadb_x_policy_priority = xp->priority;
2099 
2100         for (i=0; i<xp->xfrm_nr; i++) {
2101                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2102                 struct sadb_x_ipsecrequest *rq;
2103                 int req_size;
2104                 int mode;
2105 
2106                 req_size = sizeof(struct sadb_x_ipsecrequest);
2107                 if (t->mode == XFRM_MODE_TUNNEL) {
2108                         socklen = pfkey_sockaddr_len(t->encap_family);
2109                         req_size += socklen * 2;
2110                 } else {
2111                         size -= 2*socklen;
2112                 }
2113                 rq = (void*)skb_put(skb, req_size);
2114                 pol->sadb_x_policy_len += req_size/8;
2115                 memset(rq, 0, sizeof(*rq));
2116                 rq->sadb_x_ipsecrequest_len = req_size;
2117                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2118                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2119                         return -EINVAL;
2120                 rq->sadb_x_ipsecrequest_mode = mode;
2121                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2122                 if (t->reqid)
2123                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2124                 if (t->optional)
2125                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2126                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2127 
2128                 if (t->mode == XFRM_MODE_TUNNEL) {
2129                         u8 *sa = (void *)(rq + 1);
2130                         pfkey_sockaddr_fill(&t->saddr, 0,
2131                                             (struct sockaddr *)sa,
2132                                             t->encap_family);
2133                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2134                                             (struct sockaddr *) (sa + socklen),
2135                                             t->encap_family);
2136                 }
2137         }
2138 
2139         /* security context */
2140         if ((xfrm_ctx = xp->security)) {
2141                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2142 
2143                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2144                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2145                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2146                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2147                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2148                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2149                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2150                        xfrm_ctx->ctx_len);
2151         }
2152 
2153         hdr->sadb_msg_len = size / sizeof(uint64_t);
2154         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2155 
2156         return 0;
2157 }
2158 
2159 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2160 {
2161         struct sk_buff *out_skb;
2162         struct sadb_msg *out_hdr;
2163         int err;
2164 
2165         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2166         if (IS_ERR(out_skb))
2167                 return PTR_ERR(out_skb);
2168 
2169         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2170         if (err < 0)
2171                 return err;
2172 
2173         out_hdr = (struct sadb_msg *) out_skb->data;
2174         out_hdr->sadb_msg_version = PF_KEY_V2;
2175 
2176         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2177                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2178         else
2179                 out_hdr->sadb_msg_type = event2poltype(c->event);
2180         out_hdr->sadb_msg_errno = 0;
2181         out_hdr->sadb_msg_seq = c->seq;
2182         out_hdr->sadb_msg_pid = c->portid;
2183         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2184         return 0;
2185 
2186 }
2187 
2188 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2189 {
2190         struct net *net = sock_net(sk);
2191         int err = 0;
2192         struct sadb_lifetime *lifetime;
2193         struct sadb_address *sa;
2194         struct sadb_x_policy *pol;
2195         struct xfrm_policy *xp;
2196         struct km_event c;
2197         struct sadb_x_sec_ctx *sec_ctx;
2198 
2199         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2200                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2201             !ext_hdrs[SADB_X_EXT_POLICY-1])
2202                 return -EINVAL;
2203 
2204         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2205         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2206                 return -EINVAL;
2207         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2208                 return -EINVAL;
2209 
2210         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2211         if (xp == NULL)
2212                 return -ENOBUFS;
2213 
2214         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2215                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2216         xp->priority = pol->sadb_x_policy_priority;
2217 
2218         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2219         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2220         xp->selector.family = xp->family;
2221         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2222         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2223         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2224         if (xp->selector.sport)
2225                 xp->selector.sport_mask = htons(0xffff);
2226 
2227         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2228         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2229         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2230 
2231         /* Amusing, we set this twice.  KAME apps appear to set same value
2232          * in both addresses.
2233          */
2234         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2235 
2236         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2237         if (xp->selector.dport)
2238                 xp->selector.dport_mask = htons(0xffff);
2239 
2240         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2241         if (sec_ctx != NULL) {
2242                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2243 
2244                 if (!uctx) {
2245                         err = -ENOBUFS;
2246                         goto out;
2247                 }
2248 
2249                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2250                 kfree(uctx);
2251 
2252                 if (err)
2253                         goto out;
2254         }
2255 
2256         xp->lft.soft_byte_limit = XFRM_INF;
2257         xp->lft.hard_byte_limit = XFRM_INF;
2258         xp->lft.soft_packet_limit = XFRM_INF;
2259         xp->lft.hard_packet_limit = XFRM_INF;
2260         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2261                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2262                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2263                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2264                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2265         }
2266         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2267                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2268                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2269                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2270                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2271         }
2272         xp->xfrm_nr = 0;
2273         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2274             (err = parse_ipsecrequests(xp, pol)) < 0)
2275                 goto out;
2276 
2277         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2278                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2279 
2280         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2281 
2282         if (err)
2283                 goto out;
2284 
2285         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2286                 c.event = XFRM_MSG_UPDPOLICY;
2287         else
2288                 c.event = XFRM_MSG_NEWPOLICY;
2289 
2290         c.seq = hdr->sadb_msg_seq;
2291         c.portid = hdr->sadb_msg_pid;
2292 
2293         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2294         xfrm_pol_put(xp);
2295         return 0;
2296 
2297 out:
2298         xp->walk.dead = 1;
2299         xfrm_policy_destroy(xp);
2300         return err;
2301 }
2302 
2303 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2304 {
2305         struct net *net = sock_net(sk);
2306         int err;
2307         struct sadb_address *sa;
2308         struct sadb_x_policy *pol;
2309         struct xfrm_policy *xp;
2310         struct xfrm_selector sel;
2311         struct km_event c;
2312         struct sadb_x_sec_ctx *sec_ctx;
2313         struct xfrm_sec_ctx *pol_ctx = NULL;
2314 
2315         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2316                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2317             !ext_hdrs[SADB_X_EXT_POLICY-1])
2318                 return -EINVAL;
2319 
2320         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2321         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2322                 return -EINVAL;
2323 
2324         memset(&sel, 0, sizeof(sel));
2325 
2326         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2327         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2328         sel.prefixlen_s = sa->sadb_address_prefixlen;
2329         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2330         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2331         if (sel.sport)
2332                 sel.sport_mask = htons(0xffff);
2333 
2334         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2335         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2336         sel.prefixlen_d = sa->sadb_address_prefixlen;
2337         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2338         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2339         if (sel.dport)
2340                 sel.dport_mask = htons(0xffff);
2341 
2342         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2343         if (sec_ctx != NULL) {
2344                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2345 
2346                 if (!uctx)
2347                         return -ENOMEM;
2348 
2349                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2350                 kfree(uctx);
2351                 if (err)
2352                         return err;
2353         }
2354 
2355         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2356                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2357                                    1, &err);
2358         security_xfrm_policy_free(pol_ctx);
2359         if (xp == NULL)
2360                 return -ENOENT;
2361 
2362         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2363 
2364         if (err)
2365                 goto out;
2366 
2367         c.seq = hdr->sadb_msg_seq;
2368         c.portid = hdr->sadb_msg_pid;
2369         c.data.byid = 0;
2370         c.event = XFRM_MSG_DELPOLICY;
2371         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2372 
2373 out:
2374         xfrm_pol_put(xp);
2375         if (err == 0)
2376                 xfrm_garbage_collect(net);
2377         return err;
2378 }
2379 
2380 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2381 {
2382         int err;
2383         struct sk_buff *out_skb;
2384         struct sadb_msg *out_hdr;
2385         err = 0;
2386 
2387         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2388         if (IS_ERR(out_skb)) {
2389                 err =  PTR_ERR(out_skb);
2390                 goto out;
2391         }
2392         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2393         if (err < 0)
2394                 goto out;
2395 
2396         out_hdr = (struct sadb_msg *) out_skb->data;
2397         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2398         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2399         out_hdr->sadb_msg_satype = 0;
2400         out_hdr->sadb_msg_errno = 0;
2401         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2402         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2403         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2404         err = 0;
2405 
2406 out:
2407         return err;
2408 }
2409 
2410 #ifdef CONFIG_NET_KEY_MIGRATE
2411 static int pfkey_sockaddr_pair_size(sa_family_t family)
2412 {
2413         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2414 }
2415 
2416 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2417                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2418                                u16 *family)
2419 {
2420         int af, socklen;
2421 
2422         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2423                 return -EINVAL;
2424 
2425         af = pfkey_sockaddr_extract(sa, saddr);
2426         if (!af)
2427                 return -EINVAL;
2428 
2429         socklen = pfkey_sockaddr_len(af);
2430         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2431                                    daddr) != af)
2432                 return -EINVAL;
2433 
2434         *family = af;
2435         return 0;
2436 }
2437 
2438 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2439                                     struct xfrm_migrate *m)
2440 {
2441         int err;
2442         struct sadb_x_ipsecrequest *rq2;
2443         int mode;
2444 
2445         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2446             len < rq1->sadb_x_ipsecrequest_len)
2447                 return -EINVAL;
2448 
2449         /* old endoints */
2450         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2451                                   rq1->sadb_x_ipsecrequest_len,
2452                                   &m->old_saddr, &m->old_daddr,
2453                                   &m->old_family);
2454         if (err)
2455                 return err;
2456 
2457         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2458         len -= rq1->sadb_x_ipsecrequest_len;
2459 
2460         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2461             len < rq2->sadb_x_ipsecrequest_len)
2462                 return -EINVAL;
2463 
2464         /* new endpoints */
2465         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2466                                   rq2->sadb_x_ipsecrequest_len,
2467                                   &m->new_saddr, &m->new_daddr,
2468                                   &m->new_family);
2469         if (err)
2470                 return err;
2471 
2472         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2473             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2474             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2475                 return -EINVAL;
2476 
2477         m->proto = rq1->sadb_x_ipsecrequest_proto;
2478         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2479                 return -EINVAL;
2480         m->mode = mode;
2481         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2482 
2483         return ((int)(rq1->sadb_x_ipsecrequest_len +
2484                       rq2->sadb_x_ipsecrequest_len));
2485 }
2486 
2487 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2488                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2489 {
2490         int i, len, ret, err = -EINVAL;
2491         u8 dir;
2492         struct sadb_address *sa;
2493         struct sadb_x_kmaddress *kma;
2494         struct sadb_x_policy *pol;
2495         struct sadb_x_ipsecrequest *rq;
2496         struct xfrm_selector sel;
2497         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2498         struct xfrm_kmaddress k;
2499         struct net *net = sock_net(sk);
2500 
2501         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2502                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2503             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2504                 err = -EINVAL;
2505                 goto out;
2506         }
2507 
2508         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2509         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2510 
2511         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2512                 err = -EINVAL;
2513                 goto out;
2514         }
2515 
2516         if (kma) {
2517                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2518                 k.reserved = kma->sadb_x_kmaddress_reserved;
2519                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2520                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2521                                           &k.local, &k.remote, &k.family);
2522                 if (ret < 0) {
2523                         err = ret;
2524                         goto out;
2525                 }
2526         }
2527 
2528         dir = pol->sadb_x_policy_dir - 1;
2529         memset(&sel, 0, sizeof(sel));
2530 
2531         /* set source address info of selector */
2532         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2533         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2534         sel.prefixlen_s = sa->sadb_address_prefixlen;
2535         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2536         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2537         if (sel.sport)
2538                 sel.sport_mask = htons(0xffff);
2539 
2540         /* set destination address info of selector */
2541         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2542         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2543         sel.prefixlen_d = sa->sadb_address_prefixlen;
2544         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2545         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2546         if (sel.dport)
2547                 sel.dport_mask = htons(0xffff);
2548 
2549         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2550 
2551         /* extract ipsecrequests */
2552         i = 0;
2553         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2554 
2555         while (len > 0 && i < XFRM_MAX_DEPTH) {
2556                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2557                 if (ret < 0) {
2558                         err = ret;
2559                         goto out;
2560                 } else {
2561                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2562                         len -= ret;
2563                         i++;
2564                 }
2565         }
2566 
2567         if (!i || len > 0) {
2568                 err = -EINVAL;
2569                 goto out;
2570         }
2571 
2572         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2573                             kma ? &k : NULL, net);
2574 
2575  out:
2576         return err;
2577 }
2578 #else
2579 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2580                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2581 {
2582         return -ENOPROTOOPT;
2583 }
2584 #endif
2585 
2586 
2587 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2588 {
2589         struct net *net = sock_net(sk);
2590         unsigned int dir;
2591         int err = 0, delete;
2592         struct sadb_x_policy *pol;
2593         struct xfrm_policy *xp;
2594         struct km_event c;
2595 
2596         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2597                 return -EINVAL;
2598 
2599         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2600         if (dir >= XFRM_POLICY_MAX)
2601                 return -EINVAL;
2602 
2603         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2604         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2605                               dir, pol->sadb_x_policy_id, delete, &err);
2606         if (xp == NULL)
2607                 return -ENOENT;
2608 
2609         if (delete) {
2610                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2611 
2612                 if (err)
2613                         goto out;
2614                 c.seq = hdr->sadb_msg_seq;
2615                 c.portid = hdr->sadb_msg_pid;
2616                 c.data.byid = 1;
2617                 c.event = XFRM_MSG_DELPOLICY;
2618                 km_policy_notify(xp, dir, &c);
2619         } else {
2620                 err = key_pol_get_resp(sk, xp, hdr, dir);
2621         }
2622 
2623 out:
2624         xfrm_pol_put(xp);
2625         if (delete && err == 0)
2626                 xfrm_garbage_collect(net);
2627         return err;
2628 }
2629 
2630 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2631 {
2632         struct pfkey_sock *pfk = ptr;
2633         struct sk_buff *out_skb;
2634         struct sadb_msg *out_hdr;
2635         int err;
2636 
2637         if (!pfkey_can_dump(&pfk->sk))
2638                 return -ENOBUFS;
2639 
2640         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2641         if (IS_ERR(out_skb))
2642                 return PTR_ERR(out_skb);
2643 
2644         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2645         if (err < 0)
2646                 return err;
2647 
2648         out_hdr = (struct sadb_msg *) out_skb->data;
2649         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2650         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2651         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2652         out_hdr->sadb_msg_errno = 0;
2653         out_hdr->sadb_msg_seq = count + 1;
2654         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2655 
2656         if (pfk->dump.skb)
2657                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2658                                 &pfk->sk, sock_net(&pfk->sk));
2659         pfk->dump.skb = out_skb;
2660 
2661         return 0;
2662 }
2663 
2664 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2665 {
2666         struct net *net = sock_net(&pfk->sk);
2667         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2668 }
2669 
2670 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2671 {
2672         struct net *net = sock_net((struct sock *)pfk);
2673 
2674         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2675 }
2676 
2677 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2678 {
2679         struct pfkey_sock *pfk = pfkey_sk(sk);
2680 
2681         if (pfk->dump.dump != NULL)
2682                 return -EBUSY;
2683 
2684         pfk->dump.msg_version = hdr->sadb_msg_version;
2685         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2686         pfk->dump.dump = pfkey_dump_sp;
2687         pfk->dump.done = pfkey_dump_sp_done;
2688         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2689 
2690         return pfkey_do_dump(pfk);
2691 }
2692 
2693 static int key_notify_policy_flush(const struct km_event *c)
2694 {
2695         struct sk_buff *skb_out;
2696         struct sadb_msg *hdr;
2697 
2698         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2699         if (!skb_out)
2700                 return -ENOBUFS;
2701         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2702         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2703         hdr->sadb_msg_seq = c->seq;
2704         hdr->sadb_msg_pid = c->portid;
2705         hdr->sadb_msg_version = PF_KEY_V2;
2706         hdr->sadb_msg_errno = (uint8_t) 0;
2707         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2708         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2709         hdr->sadb_msg_reserved = 0;
2710         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2711         return 0;
2712 
2713 }
2714 
2715 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2716 {
2717         struct net *net = sock_net(sk);
2718         struct km_event c;
2719         int err, err2;
2720 
2721         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2722         err2 = unicast_flush_resp(sk, hdr);
2723         if (err || err2) {
2724                 if (err == -ESRCH) /* empty table - old silent behavior */
2725                         return 0;
2726                 return err;
2727         }
2728 
2729         c.data.type = XFRM_POLICY_TYPE_MAIN;
2730         c.event = XFRM_MSG_FLUSHPOLICY;
2731         c.portid = hdr->sadb_msg_pid;
2732         c.seq = hdr->sadb_msg_seq;
2733         c.net = net;
2734         km_policy_notify(NULL, 0, &c);
2735 
2736         return 0;
2737 }
2738 
2739 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2740                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2741 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2742         [SADB_RESERVED]         = pfkey_reserved,
2743         [SADB_GETSPI]           = pfkey_getspi,
2744         [SADB_UPDATE]           = pfkey_add,
2745         [SADB_ADD]              = pfkey_add,
2746         [SADB_DELETE]           = pfkey_delete,
2747         [SADB_GET]              = pfkey_get,
2748         [SADB_ACQUIRE]          = pfkey_acquire,
2749         [SADB_REGISTER]         = pfkey_register,
2750         [SADB_EXPIRE]           = NULL,
2751         [SADB_FLUSH]            = pfkey_flush,
2752         [SADB_DUMP]             = pfkey_dump,
2753         [SADB_X_PROMISC]        = pfkey_promisc,
2754         [SADB_X_PCHANGE]        = NULL,
2755         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2756         [SADB_X_SPDADD]         = pfkey_spdadd,
2757         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2758         [SADB_X_SPDGET]         = pfkey_spdget,
2759         [SADB_X_SPDACQUIRE]     = NULL,
2760         [SADB_X_SPDDUMP]        = pfkey_spddump,
2761         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2762         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2763         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2764         [SADB_X_MIGRATE]        = pfkey_migrate,
2765 };
2766 
2767 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2768 {
2769         void *ext_hdrs[SADB_EXT_MAX];
2770         int err;
2771 
2772         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2773                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2774 
2775         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2776         err = parse_exthdrs(skb, hdr, ext_hdrs);
2777         if (!err) {
2778                 err = -EOPNOTSUPP;
2779                 if (pfkey_funcs[hdr->sadb_msg_type])
2780                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2781         }
2782         return err;
2783 }
2784 
2785 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2786 {
2787         struct sadb_msg *hdr = NULL;
2788 
2789         if (skb->len < sizeof(*hdr)) {
2790                 *errp = -EMSGSIZE;
2791         } else {
2792                 hdr = (struct sadb_msg *) skb->data;
2793                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2794                     hdr->sadb_msg_reserved != 0 ||
2795                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2796                      hdr->sadb_msg_type > SADB_MAX)) {
2797                         hdr = NULL;
2798                         *errp = -EINVAL;
2799                 } else if (hdr->sadb_msg_len != (skb->len /
2800                                                  sizeof(uint64_t)) ||
2801                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2802                                                 sizeof(uint64_t))) {
2803                         hdr = NULL;
2804                         *errp = -EMSGSIZE;
2805                 } else {
2806                         *errp = 0;
2807                 }
2808         }
2809         return hdr;
2810 }
2811 
2812 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2813                                 const struct xfrm_algo_desc *d)
2814 {
2815         unsigned int id = d->desc.sadb_alg_id;
2816 
2817         if (id >= sizeof(t->aalgos) * 8)
2818                 return 0;
2819 
2820         return (t->aalgos >> id) & 1;
2821 }
2822 
2823 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2824                                 const struct xfrm_algo_desc *d)
2825 {
2826         unsigned int id = d->desc.sadb_alg_id;
2827 
2828         if (id >= sizeof(t->ealgos) * 8)
2829                 return 0;
2830 
2831         return (t->ealgos >> id) & 1;
2832 }
2833 
2834 static int count_ah_combs(const struct xfrm_tmpl *t)
2835 {
2836         int i, sz = 0;
2837 
2838         for (i = 0; ; i++) {
2839                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2840                 if (!aalg)
2841                         break;
2842                 if (!aalg->pfkey_supported)
2843                         continue;
2844                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2845                         sz += sizeof(struct sadb_comb);
2846         }
2847         return sz + sizeof(struct sadb_prop);
2848 }
2849 
2850 static int count_esp_combs(const struct xfrm_tmpl *t)
2851 {
2852         int i, k, sz = 0;
2853 
2854         for (i = 0; ; i++) {
2855                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2856                 if (!ealg)
2857                         break;
2858 
2859                 if (!ealg->pfkey_supported)
2860                         continue;
2861 
2862                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2863                         continue;
2864 
2865                 for (k = 1; ; k++) {
2866                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2867                         if (!aalg)
2868                                 break;
2869 
2870                         if (!aalg->pfkey_supported)
2871                                 continue;
2872 
2873                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2874                                 sz += sizeof(struct sadb_comb);
2875                 }
2876         }
2877         return sz + sizeof(struct sadb_prop);
2878 }
2879 
2880 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2881 {
2882         struct sadb_prop *p;
2883         int i;
2884 
2885         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2886         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2887         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2888         p->sadb_prop_replay = 32;
2889         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2890 
2891         for (i = 0; ; i++) {
2892                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2893                 if (!aalg)
2894                         break;
2895 
2896                 if (!aalg->pfkey_supported)
2897                         continue;
2898 
2899                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2900                         struct sadb_comb *c;
2901                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2902                         memset(c, 0, sizeof(*c));
2903                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2904                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2905                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2906                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2907                         c->sadb_comb_hard_addtime = 24*60*60;
2908                         c->sadb_comb_soft_addtime = 20*60*60;
2909                         c->sadb_comb_hard_usetime = 8*60*60;
2910                         c->sadb_comb_soft_usetime = 7*60*60;
2911                 }
2912         }
2913 }
2914 
2915 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2916 {
2917         struct sadb_prop *p;
2918         int i, k;
2919 
2920         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2921         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2922         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2923         p->sadb_prop_replay = 32;
2924         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2925 
2926         for (i=0; ; i++) {
2927                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2928                 if (!ealg)
2929                         break;
2930 
2931                 if (!ealg->pfkey_supported)
2932                         continue;
2933 
2934                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2935                         continue;
2936 
2937                 for (k = 1; ; k++) {
2938                         struct sadb_comb *c;
2939                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2940                         if (!aalg)
2941                                 break;
2942                         if (!aalg->pfkey_supported)
2943                                 continue;
2944                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2945                                 continue;
2946                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2947                         memset(c, 0, sizeof(*c));
2948                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2949                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2950                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2951                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2952                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2953                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2954                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2955                         c->sadb_comb_hard_addtime = 24*60*60;
2956                         c->sadb_comb_soft_addtime = 20*60*60;
2957                         c->sadb_comb_hard_usetime = 8*60*60;
2958                         c->sadb_comb_soft_usetime = 7*60*60;
2959                 }
2960         }
2961 }
2962 
2963 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2964 {
2965         return 0;
2966 }
2967 
2968 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2969 {
2970         struct sk_buff *out_skb;
2971         struct sadb_msg *out_hdr;
2972         int hard;
2973         int hsc;
2974 
2975         hard = c->data.hard;
2976         if (hard)
2977                 hsc = 2;
2978         else
2979                 hsc = 1;
2980 
2981         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2982         if (IS_ERR(out_skb))
2983                 return PTR_ERR(out_skb);
2984 
2985         out_hdr = (struct sadb_msg *) out_skb->data;
2986         out_hdr->sadb_msg_version = PF_KEY_V2;
2987         out_hdr->sadb_msg_type = SADB_EXPIRE;
2988         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2989         out_hdr->sadb_msg_errno = 0;
2990         out_hdr->sadb_msg_reserved = 0;
2991         out_hdr->sadb_msg_seq = 0;
2992         out_hdr->sadb_msg_pid = 0;
2993 
2994         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2995         return 0;
2996 }
2997 
2998 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2999 {
3000         struct net *net = x ? xs_net(x) : c->net;
3001         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3002 
3003         if (atomic_read(&net_pfkey->socks_nr) == 0)
3004                 return 0;
3005 
3006         switch (c->event) {
3007         case XFRM_MSG_EXPIRE:
3008                 return key_notify_sa_expire(x, c);
3009         case XFRM_MSG_DELSA:
3010         case XFRM_MSG_NEWSA:
3011         case XFRM_MSG_UPDSA:
3012                 return key_notify_sa(x, c);
3013         case XFRM_MSG_FLUSHSA:
3014                 return key_notify_sa_flush(c);
3015         case XFRM_MSG_NEWAE: /* not yet supported */
3016                 break;
3017         default:
3018                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3019                 break;
3020         }
3021 
3022         return 0;
3023 }
3024 
3025 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3026 {
3027         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3028                 return 0;
3029 
3030         switch (c->event) {
3031         case XFRM_MSG_POLEXPIRE:
3032                 return key_notify_policy_expire(xp, c);
3033         case XFRM_MSG_DELPOLICY:
3034         case XFRM_MSG_NEWPOLICY:
3035         case XFRM_MSG_UPDPOLICY:
3036                 return key_notify_policy(xp, dir, c);
3037         case XFRM_MSG_FLUSHPOLICY:
3038                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3039                         break;
3040                 return key_notify_policy_flush(c);
3041         default:
3042                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3043                 break;
3044         }
3045 
3046         return 0;
3047 }
3048 
3049 static u32 get_acqseq(void)
3050 {
3051         u32 res;
3052         static atomic_t acqseq;
3053 
3054         do {
3055                 res = atomic_inc_return(&acqseq);
3056         } while (!res);
3057         return res;
3058 }
3059 
3060 static bool pfkey_is_alive(const struct km_event *c)
3061 {
3062         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3063         struct sock *sk;
3064         bool is_alive = false;
3065 
3066         rcu_read_lock();
3067         sk_for_each_rcu(sk, &net_pfkey->table) {
3068                 if (pfkey_sk(sk)->registered) {
3069                         is_alive = true;
3070                         break;
3071                 }
3072         }
3073         rcu_read_unlock();
3074 
3075         return is_alive;
3076 }
3077 
3078 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3079 {
3080         struct sk_buff *skb;
3081         struct sadb_msg *hdr;
3082         struct sadb_address *addr;
3083         struct sadb_x_policy *pol;
3084         int sockaddr_size;
3085         int size;
3086         struct sadb_x_sec_ctx *sec_ctx;
3087         struct xfrm_sec_ctx *xfrm_ctx;
3088         int ctx_size = 0;
3089 
3090         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3091         if (!sockaddr_size)
3092                 return -EINVAL;
3093 
3094         size = sizeof(struct sadb_msg) +
3095                 (sizeof(struct sadb_address) * 2) +
3096                 (sockaddr_size * 2) +
3097                 sizeof(struct sadb_x_policy);
3098 
3099         if (x->id.proto == IPPROTO_AH)
3100                 size += count_ah_combs(t);
3101         else if (x->id.proto == IPPROTO_ESP)
3102                 size += count_esp_combs(t);
3103 
3104         if ((xfrm_ctx = x->security)) {
3105                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3106                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3107         }
3108 
3109         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3110         if (skb == NULL)
3111                 return -ENOMEM;
3112 
3113         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3114         hdr->sadb_msg_version = PF_KEY_V2;
3115         hdr->sadb_msg_type = SADB_ACQUIRE;
3116         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3117         hdr->sadb_msg_len = size / sizeof(uint64_t);
3118         hdr->sadb_msg_errno = 0;
3119         hdr->sadb_msg_reserved = 0;
3120         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3121         hdr->sadb_msg_pid = 0;
3122 
3123         /* src address */
3124         addr = (struct sadb_address*) skb_put(skb,
3125                                               sizeof(struct sadb_address)+sockaddr_size);
3126         addr->sadb_address_len =
3127                 (sizeof(struct sadb_address)+sockaddr_size)/
3128                         sizeof(uint64_t);
3129         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3130         addr->sadb_address_proto = 0;
3131         addr->sadb_address_reserved = 0;
3132         addr->sadb_address_prefixlen =
3133                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3134                                     (struct sockaddr *) (addr + 1),
3135                                     x->props.family);
3136         if (!addr->sadb_address_prefixlen)
3137                 BUG();
3138 
3139         /* dst address */
3140         addr = (struct sadb_address*) skb_put(skb,
3141                                               sizeof(struct sadb_address)+sockaddr_size);
3142         addr->sadb_address_len =
3143                 (sizeof(struct sadb_address)+sockaddr_size)/
3144                         sizeof(uint64_t);
3145         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3146         addr->sadb_address_proto = 0;
3147         addr->sadb_address_reserved = 0;
3148         addr->sadb_address_prefixlen =
3149                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3150                                     (struct sockaddr *) (addr + 1),
3151                                     x->props.family);
3152         if (!addr->sadb_address_prefixlen)
3153                 BUG();
3154 
3155         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3156         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3157         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3158         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3159         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3160         pol->sadb_x_policy_reserved = 0;
3161         pol->sadb_x_policy_id = xp->index;
3162         pol->sadb_x_policy_priority = xp->priority;
3163 
3164         /* Set sadb_comb's. */
3165         if (x->id.proto == IPPROTO_AH)
3166                 dump_ah_combs(skb, t);
3167         else if (x->id.proto == IPPROTO_ESP)
3168                 dump_esp_combs(skb, t);
3169 
3170         /* security context */
3171         if (xfrm_ctx) {
3172                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3173                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3174                 sec_ctx->sadb_x_sec_len =
3175                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3176                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3177                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3178                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3179                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3180                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3181                        xfrm_ctx->ctx_len);
3182         }
3183 
3184         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3185 }
3186 
3187 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3188                                                 u8 *data, int len, int *dir)
3189 {
3190         struct net *net = sock_net(sk);
3191         struct xfrm_policy *xp;
3192         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3193         struct sadb_x_sec_ctx *sec_ctx;
3194 
3195         switch (sk->sk_family) {
3196         case AF_INET:
3197                 if (opt != IP_IPSEC_POLICY) {
3198                         *dir = -EOPNOTSUPP;
3199                         return NULL;
3200                 }
3201                 break;
3202 #if IS_ENABLED(CONFIG_IPV6)
3203         case AF_INET6:
3204                 if (opt != IPV6_IPSEC_POLICY) {
3205                         *dir = -EOPNOTSUPP;
3206                         return NULL;
3207                 }
3208                 break;
3209 #endif
3210         default:
3211                 *dir = -EINVAL;
3212                 return NULL;
3213         }
3214 
3215         *dir = -EINVAL;
3216 
3217         if (len < sizeof(struct sadb_x_policy) ||
3218             pol->sadb_x_policy_len*8 > len ||
3219             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3220             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3221                 return NULL;
3222 
3223         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3224         if (xp == NULL) {
3225                 *dir = -ENOBUFS;
3226                 return NULL;
3227         }
3228 
3229         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3230                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3231 
3232         xp->lft.soft_byte_limit = XFRM_INF;
3233         xp->lft.hard_byte_limit = XFRM_INF;
3234         xp->lft.soft_packet_limit = XFRM_INF;
3235         xp->lft.hard_packet_limit = XFRM_INF;
3236         xp->family = sk->sk_family;
3237 
3238         xp->xfrm_nr = 0;
3239         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3240             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3241                 goto out;
3242 
3243         /* security context too */
3244         if (len >= (pol->sadb_x_policy_len*8 +
3245             sizeof(struct sadb_x_sec_ctx))) {
3246                 char *p = (char *)pol;
3247                 struct xfrm_user_sec_ctx *uctx;
3248 
3249                 p += pol->sadb_x_policy_len*8;
3250                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3251                 if (len < pol->sadb_x_policy_len*8 +
3252                     sec_ctx->sadb_x_sec_len) {
3253                         *dir = -EINVAL;
3254                         goto out;
3255                 }
3256                 if ((*dir = verify_sec_ctx_len(p)))
3257                         goto out;
3258                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3259                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3260                 kfree(uctx);
3261 
3262                 if (*dir)
3263                         goto out;
3264         }
3265 
3266         *dir = pol->sadb_x_policy_dir-1;
3267         return xp;
3268 
3269 out:
3270         xp->walk.dead = 1;
3271         xfrm_policy_destroy(xp);
3272         return NULL;
3273 }
3274 
3275 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3276 {
3277         struct sk_buff *skb;
3278         struct sadb_msg *hdr;
3279         struct sadb_sa *sa;
3280         struct sadb_address *addr;
3281         struct sadb_x_nat_t_port *n_port;
3282         int sockaddr_size;
3283         int size;
3284         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3285         struct xfrm_encap_tmpl *natt = NULL;
3286 
3287         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3288         if (!sockaddr_size)
3289                 return -EINVAL;
3290 
3291         if (!satype)
3292                 return -EINVAL;
3293 
3294         if (!x->encap)
3295                 return -EINVAL;
3296 
3297         natt = x->encap;
3298 
3299         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3300          *
3301          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3302          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3303          */
3304 
3305         size = sizeof(struct sadb_msg) +
3306                 sizeof(struct sadb_sa) +
3307                 (sizeof(struct sadb_address) * 2) +
3308                 (sockaddr_size * 2) +
3309                 (sizeof(struct sadb_x_nat_t_port) * 2);
3310 
3311         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3312         if (skb == NULL)
3313                 return -ENOMEM;
3314 
3315         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3316         hdr->sadb_msg_version = PF_KEY_V2;
3317         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3318         hdr->sadb_msg_satype = satype;
3319         hdr->sadb_msg_len = size / sizeof(uint64_t);
3320         hdr->sadb_msg_errno = 0;
3321         hdr->sadb_msg_reserved = 0;
3322         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3323         hdr->sadb_msg_pid = 0;
3324 
3325         /* SA */
3326         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3327         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3328         sa->sadb_sa_exttype = SADB_EXT_SA;
3329         sa->sadb_sa_spi = x->id.spi;
3330         sa->sadb_sa_replay = 0;
3331         sa->sadb_sa_state = 0;
3332         sa->sadb_sa_auth = 0;
3333         sa->sadb_sa_encrypt = 0;
3334         sa->sadb_sa_flags = 0;
3335 
3336         /* ADDRESS_SRC (old addr) */
3337         addr = (struct sadb_address*)
3338                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3339         addr->sadb_address_len =
3340                 (sizeof(struct sadb_address)+sockaddr_size)/
3341                         sizeof(uint64_t);
3342         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3343         addr->sadb_address_proto = 0;
3344         addr->sadb_address_reserved = 0;
3345         addr->sadb_address_prefixlen =
3346                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3347                                     (struct sockaddr *) (addr + 1),
3348                                     x->props.family);
3349         if (!addr->sadb_address_prefixlen)
3350                 BUG();
3351 
3352         /* NAT_T_SPORT (old port) */
3353         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3354         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3355         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3356         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3357         n_port->sadb_x_nat_t_port_reserved = 0;
3358 
3359         /* ADDRESS_DST (new addr) */
3360         addr = (struct sadb_address*)
3361                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3362         addr->sadb_address_len =
3363                 (sizeof(struct sadb_address)+sockaddr_size)/
3364                         sizeof(uint64_t);
3365         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3366         addr->sadb_address_proto = 0;
3367         addr->sadb_address_reserved = 0;
3368         addr->sadb_address_prefixlen =
3369                 pfkey_sockaddr_fill(ipaddr, 0,
3370                                     (struct sockaddr *) (addr + 1),
3371                                     x->props.family);
3372         if (!addr->sadb_address_prefixlen)
3373                 BUG();
3374 
3375         /* NAT_T_DPORT (new port) */
3376         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3377         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3378         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3379         n_port->sadb_x_nat_t_port_port = sport;
3380         n_port->sadb_x_nat_t_port_reserved = 0;
3381 
3382         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3383 }
3384 
3385 #ifdef CONFIG_NET_KEY_MIGRATE
3386 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3387                             const struct xfrm_selector *sel)
3388 {
3389         struct sadb_address *addr;
3390         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3391         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3392         addr->sadb_address_exttype = type;
3393         addr->sadb_address_proto = sel->proto;
3394         addr->sadb_address_reserved = 0;
3395 
3396         switch (type) {
3397         case SADB_EXT_ADDRESS_SRC:
3398                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3399                 pfkey_sockaddr_fill(&sel->saddr, 0,
3400                                     (struct sockaddr *)(addr + 1),
3401                                     sel->family);
3402                 break;
3403         case SADB_EXT_ADDRESS_DST:
3404                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3405                 pfkey_sockaddr_fill(&sel->daddr, 0,
3406                                     (struct sockaddr *)(addr + 1),
3407                                     sel->family);
3408                 break;
3409         default:
3410                 return -EINVAL;
3411         }
3412 
3413         return 0;
3414 }
3415 
3416 
3417 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3418 {
3419         struct sadb_x_kmaddress *kma;
3420         u8 *sa;
3421         int family = k->family;
3422         int socklen = pfkey_sockaddr_len(family);
3423         int size_req;
3424 
3425         size_req = (sizeof(struct sadb_x_kmaddress) +
3426                     pfkey_sockaddr_pair_size(family));
3427 
3428         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3429         memset(kma, 0, size_req);
3430         kma->sadb_x_kmaddress_len = size_req / 8;
3431         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3432         kma->sadb_x_kmaddress_reserved = k->reserved;
3433 
3434         sa = (u8 *)(kma + 1);
3435         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3436             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3437                 return -EINVAL;
3438 
3439         return 0;
3440 }
3441 
3442 static int set_ipsecrequest(struct sk_buff *skb,
3443                             uint8_t proto, uint8_t mode, int level,
3444                             uint32_t reqid, uint8_t family,
3445                             const xfrm_address_t *src, const xfrm_address_t *dst)
3446 {
3447         struct sadb_x_ipsecrequest *rq;
3448         u8 *sa;
3449         int socklen = pfkey_sockaddr_len(family);
3450         int size_req;
3451 
3452         size_req = sizeof(struct sadb_x_ipsecrequest) +
3453                    pfkey_sockaddr_pair_size(family);
3454 
3455         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3456         memset(rq, 0, size_req);
3457         rq->sadb_x_ipsecrequest_len = size_req;
3458         rq->sadb_x_ipsecrequest_proto = proto;
3459         rq->sadb_x_ipsecrequest_mode = mode;
3460         rq->sadb_x_ipsecrequest_level = level;
3461         rq->sadb_x_ipsecrequest_reqid = reqid;
3462 
3463         sa = (u8 *) (rq + 1);
3464         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3465             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3466                 return -EINVAL;
3467 
3468         return 0;
3469 }
3470 #endif
3471 
3472 #ifdef CONFIG_NET_KEY_MIGRATE
3473 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3474                               const struct xfrm_migrate *m, int num_bundles,
3475                               const struct xfrm_kmaddress *k)
3476 {
3477         int i;
3478         int sasize_sel;
3479         int size = 0;
3480         int size_pol = 0;
3481         struct sk_buff *skb;
3482         struct sadb_msg *hdr;
3483         struct sadb_x_policy *pol;
3484         const struct xfrm_migrate *mp;
3485 
3486         if (type != XFRM_POLICY_TYPE_MAIN)
3487                 return 0;
3488 
3489         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3490                 return -EINVAL;
3491 
3492         if (k != NULL) {
3493                 /* addresses for KM */
3494                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3495                                      pfkey_sockaddr_pair_size(k->family));
3496         }
3497 
3498         /* selector */
3499         sasize_sel = pfkey_sockaddr_size(sel->family);
3500         if (!sasize_sel)
3501                 return -EINVAL;
3502         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3503 
3504         /* policy info */
3505         size_pol += sizeof(struct sadb_x_policy);
3506 
3507         /* ipsecrequests */
3508         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3509                 /* old locator pair */
3510                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3511                             pfkey_sockaddr_pair_size(mp->old_family);
3512                 /* new locator pair */
3513                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3514                             pfkey_sockaddr_pair_size(mp->new_family);
3515         }
3516 
3517         size += sizeof(struct sadb_msg) + size_pol;
3518 
3519         /* alloc buffer */
3520         skb = alloc_skb(size, GFP_ATOMIC);
3521         if (skb == NULL)
3522                 return -ENOMEM;
3523 
3524         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3525         hdr->sadb_msg_version = PF_KEY_V2;
3526         hdr->sadb_msg_type = SADB_X_MIGRATE;
3527         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3528         hdr->sadb_msg_len = size / 8;
3529         hdr->sadb_msg_errno = 0;
3530         hdr->sadb_msg_reserved = 0;
3531         hdr->sadb_msg_seq = 0;
3532         hdr->sadb_msg_pid = 0;
3533 
3534         /* Addresses to be used by KM for negotiation, if ext is available */
3535         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3536                 goto err;
3537 
3538         /* selector src */
3539         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3540 
3541         /* selector dst */
3542         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3543 
3544         /* policy information */
3545         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3546         pol->sadb_x_policy_len = size_pol / 8;
3547         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3548         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3549         pol->sadb_x_policy_dir = dir + 1;
3550         pol->sadb_x_policy_reserved = 0;
3551         pol->sadb_x_policy_id = 0;
3552         pol->sadb_x_policy_priority = 0;
3553 
3554         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3555                 /* old ipsecrequest */
3556                 int mode = pfkey_mode_from_xfrm(mp->mode);
3557                 if (mode < 0)
3558                         goto err;
3559                 if (set_ipsecrequest(skb, mp->proto, mode,
3560                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3561                                      mp->reqid, mp->old_family,
3562                                      &mp->old_saddr, &mp->old_daddr) < 0)
3563                         goto err;
3564 
3565                 /* new ipsecrequest */
3566                 if (set_ipsecrequest(skb, mp->proto, mode,
3567                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3568                                      mp->reqid, mp->new_family,
3569                                      &mp->new_saddr, &mp->new_daddr) < 0)
3570                         goto err;
3571         }
3572 
3573         /* broadcast migrate message to sockets */
3574         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3575 
3576         return 0;
3577 
3578 err:
3579         kfree_skb(skb);
3580         return -EINVAL;
3581 }
3582 #else
3583 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3584                               const struct xfrm_migrate *m, int num_bundles,
3585                               const struct xfrm_kmaddress *k)
3586 {
3587         return -ENOPROTOOPT;
3588 }
3589 #endif
3590 
3591 static int pfkey_sendmsg(struct kiocb *kiocb,
3592                          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 kiocb *kiocb,
3634                          struct socket *sock, struct msghdr *msg, size_t len,
3635                          int flags)
3636 {
3637         struct sock *sk = sock->sk;
3638         struct pfkey_sock *pfk = pfkey_sk(sk);
3639         struct sk_buff *skb;
3640         int copied, err;
3641 
3642         err = -EINVAL;
3643         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3644                 goto out;
3645 
3646         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3647         if (skb == NULL)
3648                 goto out;
3649 
3650         copied = skb->len;
3651         if (copied > len) {
3652                 msg->msg_flags |= MSG_TRUNC;
3653                 copied = len;
3654         }
3655 
3656         skb_reset_transport_header(skb);
3657         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3658         if (err)
3659                 goto out_free;
3660 
3661         sock_recv_ts_and_drops(msg, sk, skb);
3662 
3663         err = (flags & MSG_TRUNC) ? skb->len : copied;
3664 
3665         if (pfk->dump.dump != NULL &&
3666             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3667                 pfkey_do_dump(pfk);
3668 
3669 out_free:
3670         skb_free_datagram(sk, skb);
3671 out:
3672         return err;
3673 }
3674 
3675 static const struct proto_ops pfkey_ops = {
3676         .family         =       PF_KEY,
3677         .owner          =       THIS_MODULE,
3678         /* Operations that make no sense on pfkey sockets. */
3679         .bind           =       sock_no_bind,
3680         .connect        =       sock_no_connect,
3681         .socketpair     =       sock_no_socketpair,
3682         .accept         =       sock_no_accept,
3683         .getname        =       sock_no_getname,
3684         .ioctl          =       sock_no_ioctl,
3685         .listen         =       sock_no_listen,
3686         .shutdown       =       sock_no_shutdown,
3687         .setsockopt     =       sock_no_setsockopt,
3688         .getsockopt     =       sock_no_getsockopt,
3689         .mmap           =       sock_no_mmap,
3690         .sendpage       =       sock_no_sendpage,
3691 
3692         /* Now the operations that really occur. */
3693         .release        =       pfkey_release,
3694         .poll           =       datagram_poll,
3695         .sendmsg        =       pfkey_sendmsg,
3696         .recvmsg        =       pfkey_recvmsg,
3697 };
3698 
3699 static const struct net_proto_family pfkey_family_ops = {
3700         .family =       PF_KEY,
3701         .create =       pfkey_create,
3702         .owner  =       THIS_MODULE,
3703 };
3704 
3705 #ifdef CONFIG_PROC_FS
3706 static int pfkey_seq_show(struct seq_file *f, void *v)
3707 {
3708         struct sock *s = sk_entry(v);
3709 
3710         if (v == SEQ_START_TOKEN)
3711                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3712         else
3713                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3714                                s,
3715                                atomic_read(&s->sk_refcnt),
3716                                sk_rmem_alloc_get(s),
3717                                sk_wmem_alloc_get(s),
3718                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3719                                sock_i_ino(s)
3720                                );
3721         return 0;
3722 }
3723 
3724 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3725         __acquires(rcu)
3726 {
3727         struct net *net = seq_file_net(f);
3728         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3729 
3730         rcu_read_lock();
3731         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3732 }
3733 
3734 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3735 {
3736         struct net *net = seq_file_net(f);
3737         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3738 
3739         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3740 }
3741 
3742 static void pfkey_seq_stop(struct seq_file *f, void *v)
3743         __releases(rcu)
3744 {
3745         rcu_read_unlock();
3746 }
3747 
3748 static const struct seq_operations pfkey_seq_ops = {
3749         .start  = pfkey_seq_start,
3750         .next   = pfkey_seq_next,
3751         .stop   = pfkey_seq_stop,
3752         .show   = pfkey_seq_show,
3753 };
3754 
3755 static int pfkey_seq_open(struct inode *inode, struct file *file)
3756 {
3757         return seq_open_net(inode, file, &pfkey_seq_ops,
3758                             sizeof(struct seq_net_private));
3759 }
3760 
3761 static const struct file_operations pfkey_proc_ops = {
3762         .open    = pfkey_seq_open,
3763         .read    = seq_read,
3764         .llseek  = seq_lseek,
3765         .release = seq_release_net,
3766 };
3767 
3768 static int __net_init pfkey_init_proc(struct net *net)
3769 {
3770         struct proc_dir_entry *e;
3771 
3772         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3773         if (e == NULL)
3774                 return -ENOMEM;
3775 
3776         return 0;
3777 }
3778 
3779 static void __net_exit pfkey_exit_proc(struct net *net)
3780 {
3781         remove_proc_entry("pfkey", net->proc_net);
3782 }
3783 #else
3784 static inline int pfkey_init_proc(struct net *net)
3785 {
3786         return 0;
3787 }
3788 
3789 static inline void pfkey_exit_proc(struct net *net)
3790 {
3791 }
3792 #endif
3793 
3794 static struct xfrm_mgr pfkeyv2_mgr =
3795 {
3796         .id             = "pfkeyv2",
3797         .notify         = pfkey_send_notify,
3798         .acquire        = pfkey_send_acquire,
3799         .compile_policy = pfkey_compile_policy,
3800         .new_mapping    = pfkey_send_new_mapping,
3801         .notify_policy  = pfkey_send_policy_notify,
3802         .migrate        = pfkey_send_migrate,
3803         .is_alive       = pfkey_is_alive,
3804 };
3805 
3806 static int __net_init pfkey_net_init(struct net *net)
3807 {
3808         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3809         int rv;
3810 
3811         INIT_HLIST_HEAD(&net_pfkey->table);
3812         atomic_set(&net_pfkey->socks_nr, 0);
3813 
3814         rv = pfkey_init_proc(net);
3815 
3816         return rv;
3817 }
3818 
3819 static void __net_exit pfkey_net_exit(struct net *net)
3820 {
3821         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3822 
3823         pfkey_exit_proc(net);
3824         BUG_ON(!hlist_empty(&net_pfkey->table));
3825 }
3826 
3827 static struct pernet_operations pfkey_net_ops = {
3828         .init = pfkey_net_init,
3829         .exit = pfkey_net_exit,
3830         .id   = &pfkey_net_id,
3831         .size = sizeof(struct netns_pfkey),
3832 };
3833 
3834 static void __exit ipsec_pfkey_exit(void)
3835 {
3836         xfrm_unregister_km(&pfkeyv2_mgr);
3837         sock_unregister(PF_KEY);
3838         unregister_pernet_subsys(&pfkey_net_ops);
3839         proto_unregister(&key_proto);
3840 }
3841 
3842 static int __init ipsec_pfkey_init(void)
3843 {
3844         int err = proto_register(&key_proto, 0);
3845 
3846         if (err != 0)
3847                 goto out;
3848 
3849         err = register_pernet_subsys(&pfkey_net_ops);
3850         if (err != 0)
3851                 goto out_unregister_key_proto;
3852         err = sock_register(&pfkey_family_ops);
3853         if (err != 0)
3854                 goto out_unregister_pernet;
3855         err = xfrm_register_km(&pfkeyv2_mgr);
3856         if (err != 0)
3857                 goto out_sock_unregister;
3858 out:
3859         return err;
3860 
3861 out_sock_unregister:
3862         sock_unregister(PF_KEY);
3863 out_unregister_pernet:
3864         unregister_pernet_subsys(&pfkey_net_ops);
3865 out_unregister_key_proto:
3866         proto_unregister(&key_proto);
3867         goto out;
3868 }
3869 
3870 module_init(ipsec_pfkey_init);
3871 module_exit(ipsec_pfkey_exit);
3872 MODULE_LICENSE("GPL");
3873 MODULE_ALIAS_NETPROTO(PF_KEY);
3874 

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