net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static 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                 break;
 409         }
 410
 411         return 0;
 412 }
 413
 414 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 415 {
 416         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 417                             sec_ctx->sadb_x_ctx_len,
 418                             sizeof(uint64_t));
 419 }
 420
 421 static inline int verify_sec_ctx_len(const void *p)
 422 {
 423         const struct sadb_x_sec_ctx *sec_ctx = p;
 424         int len = sec_ctx->sadb_x_ctx_len;
 425
 426         if (len > PAGE_SIZE)
 427                 return -EINVAL;
 428
 429         len = pfkey_sec_ctx_len(sec_ctx);
 430
 431         if (sec_ctx->sadb_x_sec_len != len)
 432                 return -EINVAL;
 433
 434         return 0;
 435 }
 436
 437 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 438                                                                      gfp_t gfp)
 439 {
 440         struct xfrm_user_sec_ctx *uctx = NULL;
 441         int ctx_size = sec_ctx->sadb_x_ctx_len;
 442
 443         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 444
 445         if (!uctx)
 446                 return NULL;
 447
 448         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 449         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 450         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 451         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 452         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 453         memcpy(uctx + 1, sec_ctx + 1,
 454                uctx->ctx_len);
 455
 456         return uctx;
 457 }
 458
 459 static int present_and_same_family(const struct sadb_address *src,
 460                                    const struct sadb_address *dst)
 461 {
 462         const struct sockaddr *s_addr, *d_addr;
 463
 464         if (!src || !dst)
 465                 return 0;
 466
 467         s_addr = (const struct sockaddr *)(src + 1);
 468         d_addr = (const struct sockaddr *)(dst + 1);
 469         if (s_addr->sa_family != d_addr->sa_family)
 470                 return 0;
 471         if (s_addr->sa_family != AF_INET
 472 #if IS_ENABLED(CONFIG_IPV6)
 473             && s_addr->sa_family != AF_INET6
 474 #endif
 475                 )
 476                 return 0;
 477
 478         return 1;
 479 }
 480
 481 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 482 {
 483         const char *p = (char *) hdr;
 484         int len = skb->len;
 485
 486         len -= sizeof(*hdr);
 487         p += sizeof(*hdr);
 488         while (len > 0) {
 489                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 490                 uint16_t ext_type;
 491                 int ext_len;
 492
 493                 ext_len  = ehdr->sadb_ext_len;
 494                 ext_len *= sizeof(uint64_t);
 495                 ext_type = ehdr->sadb_ext_type;
 496                 if (ext_len < sizeof(uint64_t) ||
 497                     ext_len > len ||
 498                     ext_type == SADB_EXT_RESERVED)
 499                         return -EINVAL;
 500
 501                 if (ext_type <= SADB_EXT_MAX) {
 502                         int min = (int) sadb_ext_min_len[ext_type];
 503                         if (ext_len < min)
 504                                 return -EINVAL;
 505                         if (ext_hdrs[ext_type-1] != NULL)
 506                                 return -EINVAL;
 507                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 508                             ext_type == SADB_EXT_ADDRESS_DST ||
 509                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 510                             ext_type == SADB_X_EXT_NAT_T_OA) {
 511                                 if (verify_address_len(p))
 512                                         return -EINVAL;
 513                         }
 514                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 515                                 if (verify_sec_ctx_len(p))
 516                                         return -EINVAL;
 517                         }
 518                         ext_hdrs[ext_type-1] = (void *) p;
 519                 }
 520                 p   += ext_len;
 521                 len -= ext_len;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static uint16_t
 528 pfkey_satype2proto(uint8_t satype)
 529 {
 530         switch (satype) {
 531         case SADB_SATYPE_UNSPEC:
 532                 return IPSEC_PROTO_ANY;
 533         case SADB_SATYPE_AH:
 534                 return IPPROTO_AH;
 535         case SADB_SATYPE_ESP:
 536                 return IPPROTO_ESP;
 537         case SADB_X_SATYPE_IPCOMP:
 538                 return IPPROTO_COMP;
 539                 break;
 540         default:
 541                 return 0;
 542         }
 543         /* NOTREACHED */
 544 }
 545
 546 static uint8_t
 547 pfkey_proto2satype(uint16_t proto)
 548 {
 549         switch (proto) {
 550         case IPPROTO_AH:
 551                 return SADB_SATYPE_AH;
 552         case IPPROTO_ESP:
 553                 return SADB_SATYPE_ESP;
 554         case IPPROTO_COMP:
 555                 return SADB_X_SATYPE_IPCOMP;
 556                 break;
 557         default:
 558                 return 0;
 559         }
 560         /* NOTREACHED */
 561 }
 562
 563 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 564  * say specifically 'just raw sockets' as we encode them as 255.
 565  */
 566
 567 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 568 {
 569         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 570 }
 571
 572 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 573 {
 574         return proto ? proto : IPSEC_PROTO_ANY;
 575 }
 576
 577 static inline int pfkey_sockaddr_len(sa_family_t family)
 578 {
 579         switch (family) {
 580         case AF_INET:
 581                 return sizeof(struct sockaddr_in);
 582 #if IS_ENABLED(CONFIG_IPV6)
 583         case AF_INET6:
 584                 return sizeof(struct sockaddr_in6);
 585 #endif
 586         }
 587         return 0;
 588 }
 589
 590 static
 591 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 592 {
 593         switch (sa->sa_family) {
 594         case AF_INET:
 595                 xaddr->a4 =
 596                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 597                 return AF_INET;
 598 #if IS_ENABLED(CONFIG_IPV6)
 599         case AF_INET6:
 600                 memcpy(xaddr->a6,
 601                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 602                        sizeof(struct in6_addr));
 603                 return AF_INET6;
 604 #endif
 605         }
 606         return 0;
 607 }
 608
 609 static
 610 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 611 {
 612         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 613                                       xaddr);
 614 }
 615
 616 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 617 {
 618         const struct sadb_sa *sa;
 619         const struct sadb_address *addr;
 620         uint16_t proto;
 621         unsigned short family;
 622         xfrm_address_t *xaddr;
 623
 624         sa = ext_hdrs[SADB_EXT_SA - 1];
 625         if (sa == NULL)
 626                 return NULL;
 627
 628         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 629         if (proto == 0)
 630                 return NULL;
 631
 632         /* sadb_address_len should be checked by caller */
 633         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 634         if (addr == NULL)
 635                 return NULL;
 636
 637         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 638         switch (family) {
 639         case AF_INET:
 640                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 641                 break;
 642 #if IS_ENABLED(CONFIG_IPV6)
 643         case AF_INET6:
 644                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 645                 break;
 646 #endif
 647         default:
 648                 xaddr = NULL;
 649         }
 650
 651         if (!xaddr)
 652                 return NULL;
 653
 654         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 655 }
 656
 657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 658
 659 static int
 660 pfkey_sockaddr_size(sa_family_t family)
 661 {
 662         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 663 }
 664
 665 static inline int pfkey_mode_from_xfrm(int mode)
 666 {
 667         switch(mode) {
 668         case XFRM_MODE_TRANSPORT:
 669                 return IPSEC_MODE_TRANSPORT;
 670         case XFRM_MODE_TUNNEL:
 671                 return IPSEC_MODE_TUNNEL;
 672         case XFRM_MODE_BEET:
 673                 return IPSEC_MODE_BEET;
 674         default:
 675                 return -1;
 676         }
 677 }
 678
 679 static inline int pfkey_mode_to_xfrm(int mode)
 680 {
 681         switch(mode) {
 682         case IPSEC_MODE_ANY:    /*XXX*/
 683         case IPSEC_MODE_TRANSPORT:
 684                 return XFRM_MODE_TRANSPORT;
 685         case IPSEC_MODE_TUNNEL:
 686                 return XFRM_MODE_TUNNEL;
 687         case IPSEC_MODE_BEET:
 688                 return XFRM_MODE_BEET;
 689         default:
 690                 return -1;
 691         }
 692 }
 693
 694 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 695                                         struct sockaddr *sa,
 696                                         unsigned short family)
 697 {
 698         switch (family) {
 699         case AF_INET:
 700             {
 701                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 702                 sin->sin_family = AF_INET;
 703                 sin->sin_port = port;
 704                 sin->sin_addr.s_addr = xaddr->a4;
 705                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 706                 return 32;
 707             }
 708 #if IS_ENABLED(CONFIG_IPV6)
 709         case AF_INET6:
 710             {
 711                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 712                 sin6->sin6_family = AF_INET6;
 713                 sin6->sin6_port = port;
 714                 sin6->sin6_flowinfo = 0;
 715                 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
 716                 sin6->sin6_scope_id = 0;
 717                 return 128;
 718             }
 719 #endif
 720         }
 721         return 0;
 722 }
 723
 724 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 725                                               int add_keys, int hsc)
 726 {
 727         struct sk_buff *skb;
 728         struct sadb_msg *hdr;
 729         struct sadb_sa *sa;
 730         struct sadb_lifetime *lifetime;
 731         struct sadb_address *addr;
 732         struct sadb_key *key;
 733         struct sadb_x_sa2 *sa2;
 734         struct sadb_x_sec_ctx *sec_ctx;
 735         struct xfrm_sec_ctx *xfrm_ctx;
 736         int ctx_size = 0;
 737         int size;
 738         int auth_key_size = 0;
 739         int encrypt_key_size = 0;
 740         int sockaddr_size;
 741         struct xfrm_encap_tmpl *natt = NULL;
 742         int mode;
 743
 744         /* address family check */
 745         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 746         if (!sockaddr_size)
 747                 return ERR_PTR(-EINVAL);
 748
 749         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 750            key(AE), (identity(SD),) (sensitivity)> */
 751         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 752                 sizeof(struct sadb_lifetime) +
 753                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 754                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 755                         sizeof(struct sadb_address)*2 +
 756                                 sockaddr_size*2 +
 757                                         sizeof(struct sadb_x_sa2);
 758
 759         if ((xfrm_ctx = x->security)) {
 760                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 761                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 762         }
 763
 764         /* identity & sensitivity */
 765         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 766                 size += sizeof(struct sadb_address) + sockaddr_size;
 767
 768         if (add_keys) {
 769                 if (x->aalg && x->aalg->alg_key_len) {
 770                         auth_key_size =
 771                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 772                         size += sizeof(struct sadb_key) + auth_key_size;
 773                 }
 774                 if (x->ealg && x->ealg->alg_key_len) {
 775                         encrypt_key_size =
 776                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 777                         size += sizeof(struct sadb_key) + encrypt_key_size;
 778                 }
 779         }
 780         if (x->encap)
 781                 natt = x->encap;
 782
 783         if (natt && natt->encap_type) {
 784                 size += sizeof(struct sadb_x_nat_t_type);
 785                 size += sizeof(struct sadb_x_nat_t_port);
 786                 size += sizeof(struct sadb_x_nat_t_port);
 787         }
 788
 789         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 790         if (skb == NULL)
 791                 return ERR_PTR(-ENOBUFS);
 792
 793         /* call should fill header later */
 794         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 795         memset(hdr, 0, size);   /* XXX do we need this ? */
 796         hdr->sadb_msg_len = size / sizeof(uint64_t);
 797
 798         /* sa */
 799         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 800         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 801         sa->sadb_sa_exttype = SADB_EXT_SA;
 802         sa->sadb_sa_spi = x->id.spi;
 803         sa->sadb_sa_replay = x->props.replay_window;
 804         switch (x->km.state) {
 805         case XFRM_STATE_VALID:
 806                 sa->sadb_sa_state = x->km.dying ?
 807                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 808                 break;
 809         case XFRM_STATE_ACQ:
 810                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 811                 break;
 812         default:
 813                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 814                 break;
 815         }
 816         sa->sadb_sa_auth = 0;
 817         if (x->aalg) {
 818                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 819                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 820                                         a->desc.sadb_alg_id : 0;
 821         }
 822         sa->sadb_sa_encrypt = 0;
 823         BUG_ON(x->ealg && x->calg);
 824         if (x->ealg) {
 825                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 826                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 827                                         a->desc.sadb_alg_id : 0;
 828         }
 829         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 830         if (x->calg) {
 831                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 832                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 833                                         a->desc.sadb_alg_id : 0;
 834         }
 835
 836         sa->sadb_sa_flags = 0;
 837         if (x->props.flags & XFRM_STATE_NOECN)
 838                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 839         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 840                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 841         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 842                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 843
 844         /* hard time */
 845         if (hsc & 2) {
 846                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 847                                                              sizeof(struct sadb_lifetime));
 848                 lifetime->sadb_lifetime_len =
 849                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 850                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 851                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 852                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 853                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 854                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 855         }
 856         /* soft time */
 857         if (hsc & 1) {
 858                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 859                                                              sizeof(struct sadb_lifetime));
 860                 lifetime->sadb_lifetime_len =
 861                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 862                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 863                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 864                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 865                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 866                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 867         }
 868         /* current time */
 869         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 870                                                      sizeof(struct sadb_lifetime));
 871         lifetime->sadb_lifetime_len =
 872                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 873         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 874         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 875         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 876         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 877         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 878         /* src address */
 879         addr = (struct sadb_address*) skb_put(skb,
 880                                               sizeof(struct sadb_address)+sockaddr_size);
 881         addr->sadb_address_len =
 882                 (sizeof(struct sadb_address)+sockaddr_size)/
 883                         sizeof(uint64_t);
 884         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 885         /* "if the ports are non-zero, then the sadb_address_proto field,
 886            normally zero, MUST be filled in with the transport
 887            protocol's number." - RFC2367 */
 888         addr->sadb_address_proto = 0;
 889         addr->sadb_address_reserved = 0;
 890
 891         addr->sadb_address_prefixlen =
 892                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 893                                     (struct sockaddr *) (addr + 1),
 894                                     x->props.family);
 895         if (!addr->sadb_address_prefixlen)
 896                 BUG();
 897
 898         /* dst address */
 899         addr = (struct sadb_address*) skb_put(skb,
 900                                               sizeof(struct sadb_address)+sockaddr_size);
 901         addr->sadb_address_len =
 902                 (sizeof(struct sadb_address)+sockaddr_size)/
 903                         sizeof(uint64_t);
 904         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 905         addr->sadb_address_proto = 0;
 906         addr->sadb_address_reserved = 0;
 907
 908         addr->sadb_address_prefixlen =
 909                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 910                                     (struct sockaddr *) (addr + 1),
 911                                     x->props.family);
 912         if (!addr->sadb_address_prefixlen)
 913                 BUG();
 914
 915         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 916                              x->props.family)) {
 917                 addr = (struct sadb_address*) skb_put(skb,
 918                         sizeof(struct sadb_address)+sockaddr_size);
 919                 addr->sadb_address_len =
 920                         (sizeof(struct sadb_address)+sockaddr_size)/
 921                         sizeof(uint64_t);
 922                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 923                 addr->sadb_address_proto =
 924                         pfkey_proto_from_xfrm(x->sel.proto);
 925                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 926                 addr->sadb_address_reserved = 0;
 927
 928                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 929                                     (struct sockaddr *) (addr + 1),
 930                                     x->props.family);
 931         }
 932
 933         /* auth key */
 934         if (add_keys && auth_key_size) {
 935                 key = (struct sadb_key *) skb_put(skb,
 936                                                   sizeof(struct sadb_key)+auth_key_size);
 937                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 938                         sizeof(uint64_t);
 939                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 940                 key->sadb_key_bits = x->aalg->alg_key_len;
 941                 key->sadb_key_reserved = 0;
 942                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 943         }
 944         /* encrypt key */
 945         if (add_keys && encrypt_key_size) {
 946                 key = (struct sadb_key *) skb_put(skb,
 947                                                   sizeof(struct sadb_key)+encrypt_key_size);
 948                 key->sadb_key_len = (sizeof(struct sadb_key) +
 949                                      encrypt_key_size) / sizeof(uint64_t);
 950                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 951                 key->sadb_key_bits = x->ealg->alg_key_len;
 952                 key->sadb_key_reserved = 0;
 953                 memcpy(key + 1, x->ealg->alg_key,
 954                        (x->ealg->alg_key_len+7)/8);
 955         }
 956
 957         /* sa */
 958         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 959         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 960         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 961         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 962                 kfree_skb(skb);
 963                 return ERR_PTR(-EINVAL);
 964         }
 965         sa2->sadb_x_sa2_mode = mode;
 966         sa2->sadb_x_sa2_reserved1 = 0;
 967         sa2->sadb_x_sa2_reserved2 = 0;
 968         sa2->sadb_x_sa2_sequence = 0;
 969         sa2->sadb_x_sa2_reqid = x->props.reqid;
 970
 971         if (natt && natt->encap_type) {
 972                 struct sadb_x_nat_t_type *n_type;
 973                 struct sadb_x_nat_t_port *n_port;
 974
 975                 /* type */
 976                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 977                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 978                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 979                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 980                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 981                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 982                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 983
 984                 /* source port */
 985                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 986                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 987                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 988                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 989                 n_port->sadb_x_nat_t_port_reserved = 0;
 990
 991                 /* dest port */
 992                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 993                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 994                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 995                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 996                 n_port->sadb_x_nat_t_port_reserved = 0;
 997         }
 998
 999         /* security context */
1000         if (xfrm_ctx) {
1001                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1002                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1003                 sec_ctx->sadb_x_sec_len =
1004                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1005                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1006                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1007                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1008                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1009                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1010                        xfrm_ctx->ctx_len);
1011         }
1012
1013         return skb;
1014 }
1015
1016
1017 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1018 {
1019         struct sk_buff *skb;
1020
1021         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1022
1023         return skb;
1024 }
1025
1026 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1027                                                           int hsc)
1028 {
1029         return __pfkey_xfrm_state2msg(x, 0, hsc);
1030 }
1031
1032 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1033                                                 const struct sadb_msg *hdr,
1034                                                 void * const *ext_hdrs)
1035 {
1036         struct xfrm_state *x;
1037         const struct sadb_lifetime *lifetime;
1038         const struct sadb_sa *sa;
1039         const struct sadb_key *key;
1040         const struct sadb_x_sec_ctx *sec_ctx;
1041         uint16_t proto;
1042         int err;
1043
1044
1045         sa = ext_hdrs[SADB_EXT_SA - 1];
1046         if (!sa ||
1047             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1048                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1049                 return ERR_PTR(-EINVAL);
1050         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1051             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1052                 return ERR_PTR(-EINVAL);
1053         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1054             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1055                 return ERR_PTR(-EINVAL);
1056         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1057             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1058                 return ERR_PTR(-EINVAL);
1059
1060         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1061         if (proto == 0)
1062                 return ERR_PTR(-EINVAL);
1063
1064         /* default error is no buffer space */
1065         err = -ENOBUFS;
1066
1067         /* RFC2367:
1068
1069    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1070    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1071    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1072    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1073    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1074    not true.
1075
1076            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1077            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1078          */
1079         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1080             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1081              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1082             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1083                 return ERR_PTR(-EINVAL);
1084         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1085         if (key != NULL &&
1086             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1087             ((key->sadb_key_bits+7) / 8 == 0 ||
1088              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1089                 return ERR_PTR(-EINVAL);
1090         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1091         if (key != NULL &&
1092             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1093             ((key->sadb_key_bits+7) / 8 == 0 ||
1094              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1095                 return ERR_PTR(-EINVAL);
1096
1097         x = xfrm_state_alloc(net);
1098         if (x == NULL)
1099                 return ERR_PTR(-ENOBUFS);
1100
1101         x->id.proto = proto;
1102         x->id.spi = sa->sadb_sa_spi;
1103         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1104                                         (sizeof(x->replay.bitmap) * 8));
1105         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1106                 x->props.flags |= XFRM_STATE_NOECN;
1107         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1108                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1109         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1110                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1111
1112         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1113         if (lifetime != NULL) {
1114                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1115                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1116                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1117                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1118         }
1119         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1120         if (lifetime != NULL) {
1121                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1122                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1123                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1124                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1125         }
1126
1127         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1128         if (sec_ctx != NULL) {
1129                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1130
1131                 if (!uctx)
1132                         goto out;
1133
1134                 err = security_xfrm_state_alloc(x, uctx);
1135                 kfree(uctx);
1136
1137                 if (err)
1138                         goto out;
1139         }
1140
1141         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1142         if (sa->sadb_sa_auth) {
1143                 int keysize = 0;
1144                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1145                 if (!a || !a->pfkey_supported) {
1146                         err = -ENOSYS;
1147                         goto out;
1148                 }
1149                 if (key)
1150                         keysize = (key->sadb_key_bits + 7) / 8;
1151                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1152                 if (!x->aalg)
1153                         goto out;
1154                 strcpy(x->aalg->alg_name, a->name);
1155                 x->aalg->alg_key_len = 0;
1156                 if (key) {
1157                         x->aalg->alg_key_len = key->sadb_key_bits;
1158                         memcpy(x->aalg->alg_key, key+1, keysize);
1159                 }
1160                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1161                 x->props.aalgo = sa->sadb_sa_auth;
1162                 /* x->algo.flags = sa->sadb_sa_flags; */
1163         }
1164         if (sa->sadb_sa_encrypt) {
1165                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1166                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1167                         if (!a || !a->pfkey_supported) {
1168                                 err = -ENOSYS;
1169                                 goto out;
1170                         }
1171                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1172                         if (!x->calg)
1173                                 goto out;
1174                         strcpy(x->calg->alg_name, a->name);
1175                         x->props.calgo = sa->sadb_sa_encrypt;
1176                 } else {
1177                         int keysize = 0;
1178                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1179                         if (!a || !a->pfkey_supported) {
1180                                 err = -ENOSYS;
1181                                 goto out;
1182                         }
1183                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1184                         if (key)
1185                                 keysize = (key->sadb_key_bits + 7) / 8;
1186                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1187                         if (!x->ealg)
1188                                 goto out;
1189                         strcpy(x->ealg->alg_name, a->name);
1190                         x->ealg->alg_key_len = 0;
1191                         if (key) {
1192                                 x->ealg->alg_key_len = key->sadb_key_bits;
1193                                 memcpy(x->ealg->alg_key, key+1, keysize);
1194                         }
1195                         x->props.ealgo = sa->sadb_sa_encrypt;
1196                 }
1197         }
1198         /* x->algo.flags = sa->sadb_sa_flags; */
1199
1200         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1201                                                     &x->props.saddr);
1202         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1203                                   &x->id.daddr);
1204
1205         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1206                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1207                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1208                 if (mode < 0) {
1209                         err = -EINVAL;
1210                         goto out;
1211                 }
1212                 x->props.mode = mode;
1213                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1214         }
1215
1216         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1217                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1218
1219                 /* Nobody uses this, but we try. */
1220                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1221                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1222         }
1223
1224         if (!x->sel.family)
1225                 x->sel.family = x->props.family;
1226
1227         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1228                 const struct sadb_x_nat_t_type* n_type;
1229                 struct xfrm_encap_tmpl *natt;
1230
1231                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1232                 if (!x->encap)
1233                         goto out;
1234
1235                 natt = x->encap;
1236                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1237                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1238
1239                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1240                         const struct sadb_x_nat_t_port *n_port =
1241                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1242                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1243                 }
1244                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1245                         const struct sadb_x_nat_t_port *n_port =
1246                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1247                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1248                 }
1249                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1250         }
1251
1252         err = xfrm_init_state(x);
1253         if (err)
1254                 goto out;
1255
1256         x->km.seq = hdr->sadb_msg_seq;
1257         return x;
1258
1259 out:
1260         x->km.state = XFRM_STATE_DEAD;
1261         xfrm_state_put(x);
1262         return ERR_PTR(err);
1263 }
1264
1265 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1266 {
1267         return -EOPNOTSUPP;
1268 }
1269
1270 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1271 {
1272         struct net *net = sock_net(sk);
1273         struct sk_buff *resp_skb;
1274         struct sadb_x_sa2 *sa2;
1275         struct sadb_address *saddr, *daddr;
1276         struct sadb_msg *out_hdr;
1277         struct sadb_spirange *range;
1278         struct xfrm_state *x = NULL;
1279         int mode;
1280         int err;
1281         u32 min_spi, max_spi;
1282         u32 reqid;
1283         u8 proto;
1284         unsigned short family;
1285         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1286
1287         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289                 return -EINVAL;
1290
1291         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1292         if (proto == 0)
1293                 return -EINVAL;
1294
1295         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1296                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1297                 if (mode < 0)
1298                         return -EINVAL;
1299                 reqid = sa2->sadb_x_sa2_reqid;
1300         } else {
1301                 mode = 0;
1302                 reqid = 0;
1303         }
1304
1305         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1306         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1307
1308         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1309         switch (family) {
1310         case AF_INET:
1311                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1312                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1313                 break;
1314 #if IS_ENABLED(CONFIG_IPV6)
1315         case AF_INET6:
1316                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1317                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1318                 break;
1319 #endif
1320         }
1321
1322         if (hdr->sadb_msg_seq) {
1323                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1324                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1325                         xfrm_state_put(x);
1326                         x = NULL;
1327                 }
1328         }
1329
1330         if (!x)
1331                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1332
1333         if (x == NULL)
1334                 return -ENOENT;
1335
1336         min_spi = 0x100;
1337         max_spi = 0x0fffffff;
1338
1339         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1340         if (range) {
1341                 min_spi = range->sadb_spirange_min;
1342                 max_spi = range->sadb_spirange_max;
1343         }
1344
1345         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1346         if (err) {
1347                 xfrm_state_put(x);
1348                 return err;
1349         }
1350
1351         err = xfrm_alloc_spi(x, min_spi, max_spi);
1352         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1353
1354         if (IS_ERR(resp_skb)) {
1355                 xfrm_state_put(x);
1356                 return  PTR_ERR(resp_skb);
1357         }
1358
1359         out_hdr = (struct sadb_msg *) resp_skb->data;
1360         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1361         out_hdr->sadb_msg_type = SADB_GETSPI;
1362         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1363         out_hdr->sadb_msg_errno = 0;
1364         out_hdr->sadb_msg_reserved = 0;
1365         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1366         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1367
1368         xfrm_state_put(x);
1369
1370         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1371
1372         return 0;
1373 }
1374
1375 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1376 {
1377         struct net *net = sock_net(sk);
1378         struct xfrm_state *x;
1379
1380         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1381                 return -EOPNOTSUPP;
1382
1383         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1384                 return 0;
1385
1386         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1387         if (x == NULL)
1388                 return 0;
1389
1390         spin_lock_bh(&x->lock);
1391         if (x->km.state == XFRM_STATE_ACQ)
1392                 x->km.state = XFRM_STATE_ERROR;
1393
1394         spin_unlock_bh(&x->lock);
1395         xfrm_state_put(x);
1396         return 0;
1397 }
1398
1399 static inline int event2poltype(int event)
1400 {
1401         switch (event) {
1402         case XFRM_MSG_DELPOLICY:
1403                 return SADB_X_SPDDELETE;
1404         case XFRM_MSG_NEWPOLICY:
1405                 return SADB_X_SPDADD;
1406         case XFRM_MSG_UPDPOLICY:
1407                 return SADB_X_SPDUPDATE;
1408         case XFRM_MSG_POLEXPIRE:
1409         //      return SADB_X_SPDEXPIRE;
1410         default:
1411                 pr_err("pfkey: Unknown policy event %d\n", event);
1412                 break;
1413         }
1414
1415         return 0;
1416 }
1417
1418 static inline int event2keytype(int event)
1419 {
1420         switch (event) {
1421         case XFRM_MSG_DELSA:
1422                 return SADB_DELETE;
1423         case XFRM_MSG_NEWSA:
1424                 return SADB_ADD;
1425         case XFRM_MSG_UPDSA:
1426                 return SADB_UPDATE;
1427         case XFRM_MSG_EXPIRE:
1428                 return SADB_EXPIRE;
1429         default:
1430                 pr_err("pfkey: Unknown SA event %d\n", event);
1431                 break;
1432         }
1433
1434         return 0;
1435 }
1436
1437 /* ADD/UPD/DEL */
1438 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1439 {
1440         struct sk_buff *skb;
1441         struct sadb_msg *hdr;
1442
1443         skb = pfkey_xfrm_state2msg(x);
1444
1445         if (IS_ERR(skb))
1446                 return PTR_ERR(skb);
1447
1448         hdr = (struct sadb_msg *) skb->data;
1449         hdr->sadb_msg_version = PF_KEY_V2;
1450         hdr->sadb_msg_type = event2keytype(c->event);
1451         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1452         hdr->sadb_msg_errno = 0;
1453         hdr->sadb_msg_reserved = 0;
1454         hdr->sadb_msg_seq = c->seq;
1455         hdr->sadb_msg_pid = c->portid;
1456
1457         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1458
1459         return 0;
1460 }
1461
1462 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1463 {
1464         struct net *net = sock_net(sk);
1465         struct xfrm_state *x;
1466         int err;
1467         struct km_event c;
1468
1469         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1470         if (IS_ERR(x))
1471                 return PTR_ERR(x);
1472
1473         xfrm_state_hold(x);
1474         if (hdr->sadb_msg_type == SADB_ADD)
1475                 err = xfrm_state_add(x);
1476         else
1477                 err = xfrm_state_update(x);
1478
1479         xfrm_audit_state_add(x, err ? 0 : 1, true);
1480
1481         if (err < 0) {
1482                 x->km.state = XFRM_STATE_DEAD;
1483                 __xfrm_state_put(x);
1484                 goto out;
1485         }
1486
1487         if (hdr->sadb_msg_type == SADB_ADD)
1488                 c.event = XFRM_MSG_NEWSA;
1489         else
1490                 c.event = XFRM_MSG_UPDSA;
1491         c.seq = hdr->sadb_msg_seq;
1492         c.portid = hdr->sadb_msg_pid;
1493         km_state_notify(x, &c);
1494 out:
1495         xfrm_state_put(x);
1496         return err;
1497 }
1498
1499 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1500 {
1501         struct net *net = sock_net(sk);
1502         struct xfrm_state *x;
1503         struct km_event c;
1504         int err;
1505
1506         if (!ext_hdrs[SADB_EXT_SA-1] ||
1507             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1508                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1509                 return -EINVAL;
1510
1511         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1512         if (x == NULL)
1513                 return -ESRCH;
1514
1515         if ((err = security_xfrm_state_delete(x)))
1516                 goto out;
1517
1518         if (xfrm_state_kern(x)) {
1519                 err = -EPERM;
1520                 goto out;
1521         }
1522
1523         err = xfrm_state_delete(x);
1524
1525         if (err < 0)
1526                 goto out;
1527
1528         c.seq = hdr->sadb_msg_seq;
1529         c.portid = hdr->sadb_msg_pid;
1530         c.event = XFRM_MSG_DELSA;
1531         km_state_notify(x, &c);
1532 out:
1533         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1534         xfrm_state_put(x);
1535
1536         return err;
1537 }
1538
1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1540 {
1541         struct net *net = sock_net(sk);
1542         __u8 proto;
1543         struct sk_buff *out_skb;
1544         struct sadb_msg *out_hdr;
1545         struct xfrm_state *x;
1546
1547         if (!ext_hdrs[SADB_EXT_SA-1] ||
1548             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550                 return -EINVAL;
1551
1552         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553         if (x == NULL)
1554                 return -ESRCH;
1555
1556         out_skb = pfkey_xfrm_state2msg(x);
1557         proto = x->id.proto;
1558         xfrm_state_put(x);
1559         if (IS_ERR(out_skb))
1560                 return  PTR_ERR(out_skb);
1561
1562         out_hdr = (struct sadb_msg *) out_skb->data;
1563         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1564         out_hdr->sadb_msg_type = SADB_GET;
1565         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1566         out_hdr->sadb_msg_errno = 0;
1567         out_hdr->sadb_msg_reserved = 0;
1568         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1569         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1570         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1571
1572         return 0;
1573 }
1574
1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1576                                               gfp_t allocation)
1577 {
1578         struct sk_buff *skb;
1579         struct sadb_msg *hdr;
1580         int len, auth_len, enc_len, i;
1581
1582         auth_len = xfrm_count_pfkey_auth_supported();
1583         if (auth_len) {
1584                 auth_len *= sizeof(struct sadb_alg);
1585                 auth_len += sizeof(struct sadb_supported);
1586         }
1587
1588         enc_len = xfrm_count_pfkey_enc_supported();
1589         if (enc_len) {
1590                 enc_len *= sizeof(struct sadb_alg);
1591                 enc_len += sizeof(struct sadb_supported);
1592         }
1593
1594         len = enc_len + auth_len + sizeof(struct sadb_msg);
1595
1596         skb = alloc_skb(len + 16, allocation);
1597         if (!skb)
1598                 goto out_put_algs;
1599
1600         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1601         pfkey_hdr_dup(hdr, orig);
1602         hdr->sadb_msg_errno = 0;
1603         hdr->sadb_msg_len = len / sizeof(uint64_t);
1604
1605         if (auth_len) {
1606                 struct sadb_supported *sp;
1607                 struct sadb_alg *ap;
1608
1609                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1610                 ap = (struct sadb_alg *) (sp + 1);
1611
1612                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1613                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1614
1615                 for (i = 0; ; i++) {
1616                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1617                         if (!aalg)
1618                                 break;
1619                         if (!aalg->pfkey_supported)
1620                                 continue;
1621                         if (aalg->available)
1622                                 *ap++ = aalg->desc;
1623                 }
1624         }
1625
1626         if (enc_len) {
1627                 struct sadb_supported *sp;
1628                 struct sadb_alg *ap;
1629
1630                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1631                 ap = (struct sadb_alg *) (sp + 1);
1632
1633                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1634                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1635
1636                 for (i = 0; ; i++) {
1637                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1638                         if (!ealg)
1639                                 break;
1640                         if (!ealg->pfkey_supported)
1641                                 continue;
1642                         if (ealg->available)
1643                                 *ap++ = ealg->desc;
1644                 }
1645         }
1646
1647 out_put_algs:
1648         return skb;
1649 }
1650
1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1652 {
1653         struct pfkey_sock *pfk = pfkey_sk(sk);
1654         struct sk_buff *supp_skb;
1655
1656         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1657                 return -EINVAL;
1658
1659         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1660                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1661                         return -EEXIST;
1662                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1663         }
1664
1665         xfrm_probe_algs();
1666
1667         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1668         if (!supp_skb) {
1669                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1670                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1671
1672                 return -ENOBUFS;
1673         }
1674
1675         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1676
1677         return 0;
1678 }
1679
1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 {
1682         struct sk_buff *skb;
1683         struct sadb_msg *hdr;
1684
1685         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1686         if (!skb)
1687                 return -ENOBUFS;
1688
1689         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1690         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1691         hdr->sadb_msg_errno = (uint8_t) 0;
1692         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1693
1694         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1695 }
1696
1697 static int key_notify_sa_flush(const struct km_event *c)
1698 {
1699         struct sk_buff *skb;
1700         struct sadb_msg *hdr;
1701
1702         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1703         if (!skb)
1704                 return -ENOBUFS;
1705         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1706         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1707         hdr->sadb_msg_type = SADB_FLUSH;
1708         hdr->sadb_msg_seq = c->seq;
1709         hdr->sadb_msg_pid = c->portid;
1710         hdr->sadb_msg_version = PF_KEY_V2;
1711         hdr->sadb_msg_errno = (uint8_t) 0;
1712         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713         hdr->sadb_msg_reserved = 0;
1714
1715         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716
1717         return 0;
1718 }
1719
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722         struct net *net = sock_net(sk);
1723         unsigned int proto;
1724         struct km_event c;
1725         int err, err2;
1726
1727         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1728         if (proto == 0)
1729                 return -EINVAL;
1730
1731         err = xfrm_state_flush(net, proto, true);
1732         err2 = unicast_flush_resp(sk, hdr);
1733         if (err || err2) {
1734                 if (err == -ESRCH) /* empty table - go quietly */
1735                         err = 0;
1736                 return err ? err : err2;
1737         }
1738
1739         c.data.proto = proto;
1740         c.seq = hdr->sadb_msg_seq;
1741         c.portid = hdr->sadb_msg_pid;
1742         c.event = XFRM_MSG_FLUSHSA;
1743         c.net = net;
1744         km_state_notify(NULL, &c);
1745
1746         return 0;
1747 }
1748
1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1750 {
1751         struct pfkey_sock *pfk = ptr;
1752         struct sk_buff *out_skb;
1753         struct sadb_msg *out_hdr;
1754
1755         if (!pfkey_can_dump(&pfk->sk))
1756                 return -ENOBUFS;
1757
1758         out_skb = pfkey_xfrm_state2msg(x);
1759         if (IS_ERR(out_skb))
1760                 return PTR_ERR(out_skb);
1761
1762         out_hdr = (struct sadb_msg *) out_skb->data;
1763         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1764         out_hdr->sadb_msg_type = SADB_DUMP;
1765         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1766         out_hdr->sadb_msg_errno = 0;
1767         out_hdr->sadb_msg_reserved = 0;
1768         out_hdr->sadb_msg_seq = count + 1;
1769         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1770
1771         if (pfk->dump.skb)
1772                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1773                                 &pfk->sk, sock_net(&pfk->sk));
1774         pfk->dump.skb = out_skb;
1775
1776         return 0;
1777 }
1778
1779 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1780 {
1781         struct net *net = sock_net(&pfk->sk);
1782         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 }
1784
1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1786 {
1787         struct net *net = sock_net(&pfk->sk);
1788
1789         xfrm_state_walk_done(&pfk->dump.u.state, net);
1790 }
1791
1792 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1793 {
1794         u8 proto;
1795         struct xfrm_address_filter *filter = NULL;
1796         struct pfkey_sock *pfk = pfkey_sk(sk);
1797
1798         if (pfk->dump.dump != NULL)
1799                 return -EBUSY;
1800
1801         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1802         if (proto == 0)
1803                 return -EINVAL;
1804
1805         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1806                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1807
1808                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1809                 if (filter == NULL)
1810                         return -ENOMEM;
1811
1812                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1813                        sizeof(xfrm_address_t));
1814                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1815                        sizeof(xfrm_address_t));
1816                 filter->family = xfilter->sadb_x_filter_family;
1817                 filter->splen = xfilter->sadb_x_filter_splen;
1818                 filter->dplen = xfilter->sadb_x_filter_dplen;
1819         }
1820
1821         pfk->dump.msg_version = hdr->sadb_msg_version;
1822         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1823         pfk->dump.dump = pfkey_dump_sa;
1824         pfk->dump.done = pfkey_dump_sa_done;
1825         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1826
1827         return pfkey_do_dump(pfk);
1828 }
1829
1830 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1831 {
1832         struct pfkey_sock *pfk = pfkey_sk(sk);
1833         int satype = hdr->sadb_msg_satype;
1834         bool reset_errno = false;
1835
1836         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1837                 reset_errno = true;
1838                 if (satype != 0 && satype != 1)
1839                         return -EINVAL;
1840                 pfk->promisc = satype;
1841         }
1842         if (reset_errno && skb_cloned(skb))
1843                 skb = skb_copy(skb, GFP_KERNEL);
1844         else
1845                 skb = skb_clone(skb, GFP_KERNEL);
1846
1847         if (reset_errno && skb) {
1848                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1849                 new_hdr->sadb_msg_errno = 0;
1850         }
1851
1852         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1853         return 0;
1854 }
1855
1856 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1857 {
1858         int i;
1859         u32 reqid = *(u32*)ptr;
1860
1861         for (i=0; i<xp->xfrm_nr; i++) {
1862                 if (xp->xfrm_vec[i].reqid == reqid)
1863                         return -EEXIST;
1864         }
1865         return 0;
1866 }
1867
1868 static u32 gen_reqid(struct net *net)
1869 {
1870         struct xfrm_policy_walk walk;
1871         u32 start;
1872         int rc;
1873         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1874
1875         start = reqid;
1876         do {
1877                 ++reqid;
1878                 if (reqid == 0)
1879                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1880                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1881                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1882                 xfrm_policy_walk_done(&walk, net);
1883                 if (rc != -EEXIST)
1884                         return reqid;
1885         } while (reqid != start);
1886         return 0;
1887 }
1888
1889 static int
1890 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1891 {
1892         struct net *net = xp_net(xp);
1893         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1894         int mode;
1895
1896         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1897                 return -ELOOP;
1898
1899         if (rq->sadb_x_ipsecrequest_mode == 0)
1900                 return -EINVAL;
1901
1902         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1903         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1904                 return -EINVAL;
1905         t->mode = mode;
1906         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1907                 t->optional = 1;
1908         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1909                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1910                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1911                         t->reqid = 0;
1912                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1913                         return -ENOBUFS;
1914         }
1915
1916         /* addresses present only in tunnel mode */
1917         if (t->mode == XFRM_MODE_TUNNEL) {
1918                 u8 *sa = (u8 *) (rq + 1);
1919                 int family, socklen;
1920
1921                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1922                                                 &t->saddr);
1923                 if (!family)
1924                         return -EINVAL;
1925
1926                 socklen = pfkey_sockaddr_len(family);
1927                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1928                                            &t->id.daddr) != family)
1929                         return -EINVAL;
1930                 t->encap_family = family;
1931         } else
1932                 t->encap_family = xp->family;
1933
1934         /* No way to set this via kame pfkey */
1935         t->allalgs = 1;
1936         xp->xfrm_nr++;
1937         return 0;
1938 }
1939
1940 static int
1941 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1942 {
1943         int err;
1944         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1945         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1946
1947         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1948                 return -EINVAL;
1949
1950         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1951                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1952                         return err;
1953                 len -= rq->sadb_x_ipsecrequest_len;
1954                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1955         }
1956         return 0;
1957 }
1958
1959 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1960 {
1961   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1962
1963         if (xfrm_ctx) {
1964                 int len = sizeof(struct sadb_x_sec_ctx);
1965                 len += xfrm_ctx->ctx_len;
1966                 return PFKEY_ALIGN8(len);
1967         }
1968         return 0;
1969 }
1970
1971 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1972 {
1973         const struct xfrm_tmpl *t;
1974         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1975         int socklen = 0;
1976         int i;
1977
1978         for (i=0; i<xp->xfrm_nr; i++) {
1979                 t = xp->xfrm_vec + i;
1980                 socklen += pfkey_sockaddr_len(t->encap_family);
1981         }
1982
1983         return sizeof(struct sadb_msg) +
1984                 (sizeof(struct sadb_lifetime) * 3) +
1985                 (sizeof(struct sadb_address) * 2) +
1986                 (sockaddr_size * 2) +
1987                 sizeof(struct sadb_x_policy) +
1988                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1989                 (socklen * 2) +
1990                 pfkey_xfrm_policy2sec_ctx_size(xp);
1991 }
1992
1993 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1994 {
1995         struct sk_buff *skb;
1996         int size;
1997
1998         size = pfkey_xfrm_policy2msg_size(xp);
1999
2000         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2001         if (skb == NULL)
2002                 return ERR_PTR(-ENOBUFS);
2003
2004         return skb;
2005 }
2006
2007 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2008 {
2009         struct sadb_msg *hdr;
2010         struct sadb_address *addr;
2011         struct sadb_lifetime *lifetime;
2012         struct sadb_x_policy *pol;
2013         struct sadb_x_sec_ctx *sec_ctx;
2014         struct xfrm_sec_ctx *xfrm_ctx;
2015         int i;
2016         int size;
2017         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2018         int socklen = pfkey_sockaddr_len(xp->family);
2019
2020         size = pfkey_xfrm_policy2msg_size(xp);
2021
2022         /* call should fill header later */
2023         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2024         memset(hdr, 0, size);   /* XXX do we need this ? */
2025
2026         /* src address */
2027         addr = (struct sadb_address*) skb_put(skb,
2028                                               sizeof(struct sadb_address)+sockaddr_size);
2029         addr->sadb_address_len =
2030                 (sizeof(struct sadb_address)+sockaddr_size)/
2031                         sizeof(uint64_t);
2032         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2033         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2034         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2035         addr->sadb_address_reserved = 0;
2036         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2037                                  xp->selector.sport,
2038                                  (struct sockaddr *) (addr + 1),
2039                                  xp->family))
2040                 BUG();
2041
2042         /* dst address */
2043         addr = (struct sadb_address*) skb_put(skb,
2044                                               sizeof(struct sadb_address)+sockaddr_size);
2045         addr->sadb_address_len =
2046                 (sizeof(struct sadb_address)+sockaddr_size)/
2047                         sizeof(uint64_t);
2048         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2049         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2050         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2051         addr->sadb_address_reserved = 0;
2052
2053         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2054                             (struct sockaddr *) (addr + 1),
2055                             xp->family);
2056
2057         /* hard time */
2058         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2059                                                      sizeof(struct sadb_lifetime));
2060         lifetime->sadb_lifetime_len =
2061                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2062         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2063         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2064         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2065         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2066         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2067         /* soft time */
2068         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2069                                                      sizeof(struct sadb_lifetime));
2070         lifetime->sadb_lifetime_len =
2071                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2072         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2073         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2074         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2075         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2076         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2077         /* current time */
2078         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2079                                                      sizeof(struct sadb_lifetime));
2080         lifetime->sadb_lifetime_len =
2081                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2082         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2083         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2084         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2085         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2086         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2087
2088         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2089         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2090         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2091         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2092         if (xp->action == XFRM_POLICY_ALLOW) {
2093                 if (xp->xfrm_nr)
2094                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2095                 else
2096                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2097         }
2098         pol->sadb_x_policy_dir = dir+1;
2099         pol->sadb_x_policy_reserved = 0;
2100         pol->sadb_x_policy_id = xp->index;
2101         pol->sadb_x_policy_priority = xp->priority;
2102
2103         for (i=0; i<xp->xfrm_nr; i++) {
2104                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2105                 struct sadb_x_ipsecrequest *rq;
2106                 int req_size;
2107                 int mode;
2108
2109                 req_size = sizeof(struct sadb_x_ipsecrequest);
2110                 if (t->mode == XFRM_MODE_TUNNEL) {
2111                         socklen = pfkey_sockaddr_len(t->encap_family);
2112                         req_size += socklen * 2;
2113                 } else {
2114                         size -= 2*socklen;
2115                 }
2116                 rq = (void*)skb_put(skb, req_size);
2117                 pol->sadb_x_policy_len += req_size/8;
2118                 memset(rq, 0, sizeof(*rq));
2119                 rq->sadb_x_ipsecrequest_len = req_size;
2120                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2121                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2122                         return -EINVAL;
2123                 rq->sadb_x_ipsecrequest_mode = mode;
2124                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2125                 if (t->reqid)
2126                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2127                 if (t->optional)
2128                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2129                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2130
2131                 if (t->mode == XFRM_MODE_TUNNEL) {
2132                         u8 *sa = (void *)(rq + 1);
2133                         pfkey_sockaddr_fill(&t->saddr, 0,
2134                                             (struct sockaddr *)sa,
2135                                             t->encap_family);
2136                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2137                                             (struct sockaddr *) (sa + socklen),
2138                                             t->encap_family);
2139                 }
2140         }
2141
2142         /* security context */
2143         if ((xfrm_ctx = xp->security)) {
2144                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2145
2146                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2147                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2148                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2149                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2150                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2151                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2152                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2153                        xfrm_ctx->ctx_len);
2154         }
2155
2156         hdr->sadb_msg_len = size / sizeof(uint64_t);
2157         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2158
2159         return 0;
2160 }
2161
2162 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2163 {
2164         struct sk_buff *out_skb;
2165         struct sadb_msg *out_hdr;
2166         int err;
2167
2168         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2169         if (IS_ERR(out_skb))
2170                 return PTR_ERR(out_skb);
2171
2172         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2173         if (err < 0)
2174                 return err;
2175
2176         out_hdr = (struct sadb_msg *) out_skb->data;
2177         out_hdr->sadb_msg_version = PF_KEY_V2;
2178
2179         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2180                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2181         else
2182                 out_hdr->sadb_msg_type = event2poltype(c->event);
2183         out_hdr->sadb_msg_errno = 0;
2184         out_hdr->sadb_msg_seq = c->seq;
2185         out_hdr->sadb_msg_pid = c->portid;
2186         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2187         return 0;
2188
2189 }
2190
2191 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2192 {
2193         struct net *net = sock_net(sk);
2194         int err = 0;
2195         struct sadb_lifetime *lifetime;
2196         struct sadb_address *sa;
2197         struct sadb_x_policy *pol;
2198         struct xfrm_policy *xp;
2199         struct km_event c;
2200         struct sadb_x_sec_ctx *sec_ctx;
2201
2202         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2203                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2204             !ext_hdrs[SADB_X_EXT_POLICY-1])
2205                 return -EINVAL;
2206
2207         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2208         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2209                 return -EINVAL;
2210         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2211                 return -EINVAL;
2212
2213         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2214         if (xp == NULL)
2215                 return -ENOBUFS;
2216
2217         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2218                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2219         xp->priority = pol->sadb_x_policy_priority;
2220
2221         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2222         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2223         xp->selector.family = xp->family;
2224         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2225         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2227         if (xp->selector.sport)
2228                 xp->selector.sport_mask = htons(0xffff);
2229
2230         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2231         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2232         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2233
2234         /* Amusing, we set this twice.  KAME apps appear to set same value
2235          * in both addresses.
2236          */
2237         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2238
2239         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2240         if (xp->selector.dport)
2241                 xp->selector.dport_mask = htons(0xffff);
2242
2243         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2244         if (sec_ctx != NULL) {
2245                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2246
2247                 if (!uctx) {
2248                         err = -ENOBUFS;
2249                         goto out;
2250                 }
2251
2252                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2253                 kfree(uctx);
2254
2255                 if (err)
2256                         goto out;
2257         }
2258
2259         xp->lft.soft_byte_limit = XFRM_INF;
2260         xp->lft.hard_byte_limit = XFRM_INF;
2261         xp->lft.soft_packet_limit = XFRM_INF;
2262         xp->lft.hard_packet_limit = XFRM_INF;
2263         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2264                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2265                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2266                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2267                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2268         }
2269         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2270                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2271                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2272                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2273                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2274         }
2275         xp->xfrm_nr = 0;
2276         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2277             (err = parse_ipsecrequests(xp, pol)) < 0)
2278                 goto out;
2279
2280         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2281                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2282
2283         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2284
2285         if (err)
2286                 goto out;
2287
2288         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2289                 c.event = XFRM_MSG_UPDPOLICY;
2290         else
2291                 c.event = XFRM_MSG_NEWPOLICY;
2292
2293         c.seq = hdr->sadb_msg_seq;
2294         c.portid = hdr->sadb_msg_pid;
2295
2296         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2297         xfrm_pol_put(xp);
2298         return 0;
2299
2300 out:
2301         xp->walk.dead = 1;
2302         xfrm_policy_destroy(xp);
2303         return err;
2304 }
2305
2306 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2307 {
2308         struct net *net = sock_net(sk);
2309         int err;
2310         struct sadb_address *sa;
2311         struct sadb_x_policy *pol;
2312         struct xfrm_policy *xp;
2313         struct xfrm_selector sel;
2314         struct km_event c;
2315         struct sadb_x_sec_ctx *sec_ctx;
2316         struct xfrm_sec_ctx *pol_ctx = NULL;
2317
2318         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2319                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2320             !ext_hdrs[SADB_X_EXT_POLICY-1])
2321                 return -EINVAL;
2322
2323         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2324         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2325                 return -EINVAL;
2326
2327         memset(&sel, 0, sizeof(sel));
2328
2329         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2330         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2331         sel.prefixlen_s = sa->sadb_address_prefixlen;
2332         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2333         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2334         if (sel.sport)
2335                 sel.sport_mask = htons(0xffff);
2336
2337         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2338         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2339         sel.prefixlen_d = sa->sadb_address_prefixlen;
2340         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2341         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2342         if (sel.dport)
2343                 sel.dport_mask = htons(0xffff);
2344
2345         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2346         if (sec_ctx != NULL) {
2347                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2348
2349                 if (!uctx)
2350                         return -ENOMEM;
2351
2352                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2353                 kfree(uctx);
2354                 if (err)
2355                         return err;
2356         }
2357
2358         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2359                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2360                                    1, &err);
2361         security_xfrm_policy_free(pol_ctx);
2362         if (xp == NULL)
2363                 return -ENOENT;
2364
2365         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2366
2367         if (err)
2368                 goto out;
2369
2370         c.seq = hdr->sadb_msg_seq;
2371         c.portid = hdr->sadb_msg_pid;
2372         c.data.byid = 0;
2373         c.event = XFRM_MSG_DELPOLICY;
2374         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2375
2376 out:
2377         xfrm_pol_put(xp);
2378         if (err == 0)
2379                 xfrm_garbage_collect(net);
2380         return err;
2381 }
2382
2383 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2384 {
2385         int err;
2386         struct sk_buff *out_skb;
2387         struct sadb_msg *out_hdr;
2388         err = 0;
2389
2390         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2391         if (IS_ERR(out_skb)) {
2392                 err =  PTR_ERR(out_skb);
2393                 goto out;
2394         }
2395         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2396         if (err < 0)
2397                 goto out;
2398
2399         out_hdr = (struct sadb_msg *) out_skb->data;
2400         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2401         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2402         out_hdr->sadb_msg_satype = 0;
2403         out_hdr->sadb_msg_errno = 0;
2404         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2405         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2406         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2407         err = 0;
2408
2409 out:
2410         return err;
2411 }
2412
2413 #ifdef CONFIG_NET_KEY_MIGRATE
2414 static int pfkey_sockaddr_pair_size(sa_family_t family)
2415 {
2416         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2417 }
2418
2419 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2420                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2421                                u16 *family)
2422 {
2423         int af, socklen;
2424
2425         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2426                 return -EINVAL;
2427
2428         af = pfkey_sockaddr_extract(sa, saddr);
2429         if (!af)
2430                 return -EINVAL;
2431
2432         socklen = pfkey_sockaddr_len(af);
2433         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2434                                    daddr) != af)
2435                 return -EINVAL;
2436
2437         *family = af;
2438         return 0;
2439 }
2440
2441 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2442                                     struct xfrm_migrate *m)
2443 {
2444         int err;
2445         struct sadb_x_ipsecrequest *rq2;
2446         int mode;
2447
2448         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2449             len < rq1->sadb_x_ipsecrequest_len)
2450                 return -EINVAL;
2451
2452         /* old endoints */
2453         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2454                                   rq1->sadb_x_ipsecrequest_len,
2455                                   &m->old_saddr, &m->old_daddr,
2456                                   &m->old_family);
2457         if (err)
2458                 return err;
2459
2460         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2461         len -= rq1->sadb_x_ipsecrequest_len;
2462
2463         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2464             len < rq2->sadb_x_ipsecrequest_len)
2465                 return -EINVAL;
2466
2467         /* new endpoints */
2468         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2469                                   rq2->sadb_x_ipsecrequest_len,
2470                                   &m->new_saddr, &m->new_daddr,
2471                                   &m->new_family);
2472         if (err)
2473                 return err;
2474
2475         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2476             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2477             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2478                 return -EINVAL;
2479
2480         m->proto = rq1->sadb_x_ipsecrequest_proto;
2481         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2482                 return -EINVAL;
2483         m->mode = mode;
2484         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2485
2486         return ((int)(rq1->sadb_x_ipsecrequest_len +
2487                       rq2->sadb_x_ipsecrequest_len));
2488 }
2489
2490 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2491                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2492 {
2493         int i, len, ret, err = -EINVAL;
2494         u8 dir;
2495         struct sadb_address *sa;
2496         struct sadb_x_kmaddress *kma;
2497         struct sadb_x_policy *pol;
2498         struct sadb_x_ipsecrequest *rq;
2499         struct xfrm_selector sel;
2500         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2501         struct xfrm_kmaddress k;
2502         struct net *net = sock_net(sk);
2503
2504         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2505                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2506             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2507                 err = -EINVAL;
2508                 goto out;
2509         }
2510
2511         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2512         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2513
2514         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2515                 err = -EINVAL;
2516                 goto out;
2517         }
2518
2519         if (kma) {
2520                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2521                 k.reserved = kma->sadb_x_kmaddress_reserved;
2522                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2523                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2524                                           &k.local, &k.remote, &k.family);
2525                 if (ret < 0) {
2526                         err = ret;
2527                         goto out;
2528                 }
2529         }
2530
2531         dir = pol->sadb_x_policy_dir - 1;
2532         memset(&sel, 0, sizeof(sel));
2533
2534         /* set source address info of selector */
2535         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2536         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2537         sel.prefixlen_s = sa->sadb_address_prefixlen;
2538         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2539         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2540         if (sel.sport)
2541                 sel.sport_mask = htons(0xffff);
2542
2543         /* set destination address info of selector */
2544         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2545         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2546         sel.prefixlen_d = sa->sadb_address_prefixlen;
2547         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2548         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2549         if (sel.dport)
2550                 sel.dport_mask = htons(0xffff);
2551
2552         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2553
2554         /* extract ipsecrequests */
2555         i = 0;
2556         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2557
2558         while (len > 0 && i < XFRM_MAX_DEPTH) {
2559                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2560                 if (ret < 0) {
2561                         err = ret;
2562                         goto out;
2563                 } else {
2564                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2565                         len -= ret;
2566                         i++;
2567                 }
2568         }
2569
2570         if (!i || len > 0) {
2571                 err = -EINVAL;
2572                 goto out;
2573         }
2574
2575         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2576                             kma ? &k : NULL, net);
2577
2578  out:
2579         return err;
2580 }
2581 #else
2582 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2583                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2584 {
2585         return -ENOPROTOOPT;
2586 }
2587 #endif
2588
2589
2590 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2591 {
2592         struct net *net = sock_net(sk);
2593         unsigned int dir;
2594         int err = 0, delete;
2595         struct sadb_x_policy *pol;
2596         struct xfrm_policy *xp;
2597         struct km_event c;
2598
2599         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2600                 return -EINVAL;
2601
2602         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2603         if (dir >= XFRM_POLICY_MAX)
2604                 return -EINVAL;
2605
2606         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2607         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2608                               dir, pol->sadb_x_policy_id, delete, &err);
2609         if (xp == NULL)
2610                 return -ENOENT;
2611
2612         if (delete) {
2613                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2614
2615                 if (err)
2616                         goto out;
2617                 c.seq = hdr->sadb_msg_seq;
2618                 c.portid = hdr->sadb_msg_pid;
2619                 c.data.byid = 1;
2620                 c.event = XFRM_MSG_DELPOLICY;
2621                 km_policy_notify(xp, dir, &c);
2622         } else {
2623                 err = key_pol_get_resp(sk, xp, hdr, dir);
2624         }
2625
2626 out:
2627         xfrm_pol_put(xp);
2628         if (delete && err == 0)
2629                 xfrm_garbage_collect(net);
2630         return err;
2631 }
2632
2633 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2634 {
2635         struct pfkey_sock *pfk = ptr;
2636         struct sk_buff *out_skb;
2637         struct sadb_msg *out_hdr;
2638         int err;
2639
2640         if (!pfkey_can_dump(&pfk->sk))
2641                 return -ENOBUFS;
2642
2643         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2644         if (IS_ERR(out_skb))
2645                 return PTR_ERR(out_skb);
2646
2647         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2648         if (err < 0)
2649                 return err;
2650
2651         out_hdr = (struct sadb_msg *) out_skb->data;
2652         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2653         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2654         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2655         out_hdr->sadb_msg_errno = 0;
2656         out_hdr->sadb_msg_seq = count + 1;
2657         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2658
2659         if (pfk->dump.skb)
2660                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2661                                 &pfk->sk, sock_net(&pfk->sk));
2662         pfk->dump.skb = out_skb;
2663
2664         return 0;
2665 }
2666
2667 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2668 {
2669         struct net *net = sock_net(&pfk->sk);
2670         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2671 }
2672
2673 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2674 {
2675         struct net *net = sock_net((struct sock *)pfk);
2676
2677         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2678 }
2679
2680 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2681 {
2682         struct pfkey_sock *pfk = pfkey_sk(sk);
2683
2684         if (pfk->dump.dump != NULL)
2685                 return -EBUSY;
2686
2687         pfk->dump.msg_version = hdr->sadb_msg_version;
2688         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2689         pfk->dump.dump = pfkey_dump_sp;
2690         pfk->dump.done = pfkey_dump_sp_done;
2691         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2692
2693         return pfkey_do_dump(pfk);
2694 }
2695
2696 static int key_notify_policy_flush(const struct km_event *c)
2697 {
2698         struct sk_buff *skb_out;
2699         struct sadb_msg *hdr;
2700
2701         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2702         if (!skb_out)
2703                 return -ENOBUFS;
2704         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2705         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2706         hdr->sadb_msg_seq = c->seq;
2707         hdr->sadb_msg_pid = c->portid;
2708         hdr->sadb_msg_version = PF_KEY_V2;
2709         hdr->sadb_msg_errno = (uint8_t) 0;
2710         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2711         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2712         hdr->sadb_msg_reserved = 0;
2713         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2714         return 0;
2715
2716 }
2717
2718 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2719 {
2720         struct net *net = sock_net(sk);
2721         struct km_event c;
2722         int err, err2;
2723
2724         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2725         err2 = unicast_flush_resp(sk, hdr);
2726         if (err || err2) {
2727                 if (err == -ESRCH) /* empty table - old silent behavior */
2728                         return 0;
2729                 return err;
2730         }
2731
2732         c.data.type = XFRM_POLICY_TYPE_MAIN;
2733         c.event = XFRM_MSG_FLUSHPOLICY;
2734         c.portid = hdr->sadb_msg_pid;
2735         c.seq = hdr->sadb_msg_seq;
2736         c.net = net;
2737         km_policy_notify(NULL, 0, &c);
2738
2739         return 0;
2740 }
2741
2742 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2743                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2744 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2745         [SADB_RESERVED]         = pfkey_reserved,
2746         [SADB_GETSPI]           = pfkey_getspi,
2747         [SADB_UPDATE]           = pfkey_add,
2748         [SADB_ADD]              = pfkey_add,
2749         [SADB_DELETE]           = pfkey_delete,
2750         [SADB_GET]              = pfkey_get,
2751         [SADB_ACQUIRE]          = pfkey_acquire,
2752         [SADB_REGISTER]         = pfkey_register,
2753         [SADB_EXPIRE]           = NULL,
2754         [SADB_FLUSH]            = pfkey_flush,
2755         [SADB_DUMP]             = pfkey_dump,
2756         [SADB_X_PROMISC]        = pfkey_promisc,
2757         [SADB_X_PCHANGE]        = NULL,
2758         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2759         [SADB_X_SPDADD]         = pfkey_spdadd,
2760         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2761         [SADB_X_SPDGET]         = pfkey_spdget,
2762         [SADB_X_SPDACQUIRE]     = NULL,
2763         [SADB_X_SPDDUMP]        = pfkey_spddump,
2764         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2765         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2766         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2767         [SADB_X_MIGRATE]        = pfkey_migrate,
2768 };
2769
2770 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2771 {
2772         void *ext_hdrs[SADB_EXT_MAX];
2773         int err;
2774
2775         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2776                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2777
2778         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2779         err = parse_exthdrs(skb, hdr, ext_hdrs);
2780         if (!err) {
2781                 err = -EOPNOTSUPP;
2782                 if (pfkey_funcs[hdr->sadb_msg_type])
2783                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2784         }
2785         return err;
2786 }
2787
2788 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2789 {
2790         struct sadb_msg *hdr = NULL;
2791
2792         if (skb->len < sizeof(*hdr)) {
2793                 *errp = -EMSGSIZE;
2794         } else {
2795                 hdr = (struct sadb_msg *) skb->data;
2796                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2797                     hdr->sadb_msg_reserved != 0 ||
2798                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2799                      hdr->sadb_msg_type > SADB_MAX)) {
2800                         hdr = NULL;
2801                         *errp = -EINVAL;
2802                 } else if (hdr->sadb_msg_len != (skb->len /
2803                                                  sizeof(uint64_t)) ||
2804                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2805                                                 sizeof(uint64_t))) {
2806                         hdr = NULL;
2807                         *errp = -EMSGSIZE;
2808                 } else {
2809                         *errp = 0;
2810                 }
2811         }
2812         return hdr;
2813 }
2814
2815 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2816                                 const struct xfrm_algo_desc *d)
2817 {
2818         unsigned int id = d->desc.sadb_alg_id;
2819
2820         if (id >= sizeof(t->aalgos) * 8)
2821                 return 0;
2822
2823         return (t->aalgos >> id) & 1;
2824 }
2825
2826 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2827                                 const struct xfrm_algo_desc *d)
2828 {
2829         unsigned int id = d->desc.sadb_alg_id;
2830
2831         if (id >= sizeof(t->ealgos) * 8)
2832                 return 0;
2833
2834         return (t->ealgos >> id) & 1;
2835 }
2836
2837 static int count_ah_combs(const struct xfrm_tmpl *t)
2838 {
2839         int i, sz = 0;
2840
2841         for (i = 0; ; i++) {
2842                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2843                 if (!aalg)
2844                         break;
2845                 if (!aalg->pfkey_supported)
2846                         continue;
2847                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2848                         sz += sizeof(struct sadb_comb);
2849         }
2850         return sz + sizeof(struct sadb_prop);
2851 }
2852
2853 static int count_esp_combs(const struct xfrm_tmpl *t)
2854 {
2855         int i, k, sz = 0;
2856
2857         for (i = 0; ; i++) {
2858                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2859                 if (!ealg)
2860                         break;
2861
2862                 if (!ealg->pfkey_supported)
2863                         continue;
2864
2865                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2866                         continue;
2867
2868                 for (k = 1; ; k++) {
2869                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2870                         if (!aalg)
2871                                 break;
2872
2873                         if (!aalg->pfkey_supported)
2874                                 continue;
2875
2876                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2877                                 sz += sizeof(struct sadb_comb);
2878                 }
2879         }
2880         return sz + sizeof(struct sadb_prop);
2881 }
2882
2883 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2884 {
2885         struct sadb_prop *p;
2886         int i;
2887
2888         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2889         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2890         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2891         p->sadb_prop_replay = 32;
2892         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2893
2894         for (i = 0; ; i++) {
2895                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2896                 if (!aalg)
2897                         break;
2898
2899                 if (!aalg->pfkey_supported)
2900                         continue;
2901
2902                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2903                         struct sadb_comb *c;
2904                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2905                         memset(c, 0, sizeof(*c));
2906                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2907                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2908                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2909                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2910                         c->sadb_comb_hard_addtime = 24*60*60;
2911                         c->sadb_comb_soft_addtime = 20*60*60;
2912                         c->sadb_comb_hard_usetime = 8*60*60;
2913                         c->sadb_comb_soft_usetime = 7*60*60;
2914                 }
2915         }
2916 }
2917
2918 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2919 {
2920         struct sadb_prop *p;
2921         int i, k;
2922
2923         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2924         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2925         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2926         p->sadb_prop_replay = 32;
2927         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2928
2929         for (i=0; ; i++) {
2930                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2931                 if (!ealg)
2932                         break;
2933
2934                 if (!ealg->pfkey_supported)
2935                         continue;
2936
2937                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2938                         continue;
2939
2940                 for (k = 1; ; k++) {
2941                         struct sadb_comb *c;
2942                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2943                         if (!aalg)
2944                                 break;
2945                         if (!aalg->pfkey_supported)
2946                                 continue;
2947                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2948                                 continue;
2949                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2950                         memset(c, 0, sizeof(*c));
2951                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2952                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2953                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2954                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2955                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2956                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2957                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2958                         c->sadb_comb_hard_addtime = 24*60*60;
2959                         c->sadb_comb_soft_addtime = 20*60*60;
2960                         c->sadb_comb_hard_usetime = 8*60*60;
2961                         c->sadb_comb_soft_usetime = 7*60*60;
2962                 }
2963         }
2964 }
2965
2966 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2967 {
2968         return 0;
2969 }
2970
2971 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2972 {
2973         struct sk_buff *out_skb;
2974         struct sadb_msg *out_hdr;
2975         int hard;
2976         int hsc;
2977
2978         hard = c->data.hard;
2979         if (hard)
2980                 hsc = 2;
2981         else
2982                 hsc = 1;
2983
2984         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2985         if (IS_ERR(out_skb))
2986                 return PTR_ERR(out_skb);
2987
2988         out_hdr = (struct sadb_msg *) out_skb->data;
2989         out_hdr->sadb_msg_version = PF_KEY_V2;
2990         out_hdr->sadb_msg_type = SADB_EXPIRE;
2991         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2992         out_hdr->sadb_msg_errno = 0;
2993         out_hdr->sadb_msg_reserved = 0;
2994         out_hdr->sadb_msg_seq = 0;
2995         out_hdr->sadb_msg_pid = 0;
2996
2997         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2998         return 0;
2999 }
3000
3001 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3002 {
3003         struct net *net = x ? xs_net(x) : c->net;
3004         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3005
3006         if (atomic_read(&net_pfkey->socks_nr) == 0)
3007                 return 0;
3008
3009         switch (c->event) {
3010         case XFRM_MSG_EXPIRE:
3011                 return key_notify_sa_expire(x, c);
3012         case XFRM_MSG_DELSA:
3013         case XFRM_MSG_NEWSA:
3014         case XFRM_MSG_UPDSA:
3015                 return key_notify_sa(x, c);
3016         case XFRM_MSG_FLUSHSA:
3017                 return key_notify_sa_flush(c);
3018         case XFRM_MSG_NEWAE: /* not yet supported */
3019                 break;
3020         default:
3021                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3022                 break;
3023         }
3024
3025         return 0;
3026 }
3027
3028 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3029 {
3030         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3031                 return 0;
3032
3033         switch (c->event) {
3034         case XFRM_MSG_POLEXPIRE:
3035                 return key_notify_policy_expire(xp, c);
3036         case XFRM_MSG_DELPOLICY:
3037         case XFRM_MSG_NEWPOLICY:
3038         case XFRM_MSG_UPDPOLICY:
3039                 return key_notify_policy(xp, dir, c);
3040         case XFRM_MSG_FLUSHPOLICY:
3041                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3042                         break;
3043                 return key_notify_policy_flush(c);
3044         default:
3045                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3046                 break;
3047         }
3048
3049         return 0;
3050 }
3051
3052 static u32 get_acqseq(void)
3053 {
3054         u32 res;
3055         static atomic_t acqseq;
3056
3057         do {
3058                 res = atomic_inc_return(&acqseq);
3059         } while (!res);
3060         return res;
3061 }
3062
3063 static bool pfkey_is_alive(const struct km_event *c)
3064 {
3065         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3066         struct sock *sk;
3067         bool is_alive = false;
3068
3069         rcu_read_lock();
3070         sk_for_each_rcu(sk, &net_pfkey->table) {
3071                 if (pfkey_sk(sk)->registered) {
3072                         is_alive = true;
3073                         break;
3074                 }
3075         }
3076         rcu_read_unlock();
3077
3078         return is_alive;
3079 }
3080
3081 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3082 {
3083         struct sk_buff *skb;
3084         struct sadb_msg *hdr;
3085         struct sadb_address *addr;
3086         struct sadb_x_policy *pol;
3087         int sockaddr_size;
3088         int size;
3089         struct sadb_x_sec_ctx *sec_ctx;
3090         struct xfrm_sec_ctx *xfrm_ctx;
3091         int ctx_size = 0;
3092
3093         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3094         if (!sockaddr_size)
3095                 return -EINVAL;
3096
3097         size = sizeof(struct sadb_msg) +
3098                 (sizeof(struct sadb_address) * 2) +
3099                 (sockaddr_size * 2) +
3100                 sizeof(struct sadb_x_policy);
3101
3102         if (x->id.proto == IPPROTO_AH)
3103                 size += count_ah_combs(t);
3104         else if (x->id.proto == IPPROTO_ESP)
3105                 size += count_esp_combs(t);
3106
3107         if ((xfrm_ctx = x->security)) {
3108                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3109                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3110         }
3111
3112         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3113         if (skb == NULL)
3114                 return -ENOMEM;
3115
3116         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3117         hdr->sadb_msg_version = PF_KEY_V2;
3118         hdr->sadb_msg_type = SADB_ACQUIRE;
3119         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3120         hdr->sadb_msg_len = size / sizeof(uint64_t);
3121         hdr->sadb_msg_errno = 0;
3122         hdr->sadb_msg_reserved = 0;
3123         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3124         hdr->sadb_msg_pid = 0;
3125
3126         /* src address */
3127         addr = (struct sadb_address*) skb_put(skb,
3128                                               sizeof(struct sadb_address)+sockaddr_size);
3129         addr->sadb_address_len =
3130                 (sizeof(struct sadb_address)+sockaddr_size)/
3131                         sizeof(uint64_t);
3132         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3133         addr->sadb_address_proto = 0;
3134         addr->sadb_address_reserved = 0;
3135         addr->sadb_address_prefixlen =
3136                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3137                                     (struct sockaddr *) (addr + 1),
3138                                     x->props.family);
3139         if (!addr->sadb_address_prefixlen)
3140                 BUG();
3141
3142         /* dst address */
3143         addr = (struct sadb_address*) skb_put(skb,
3144                                               sizeof(struct sadb_address)+sockaddr_size);
3145         addr->sadb_address_len =
3146                 (sizeof(struct sadb_address)+sockaddr_size)/
3147                         sizeof(uint64_t);
3148         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3149         addr->sadb_address_proto = 0;
3150         addr->sadb_address_reserved = 0;
3151         addr->sadb_address_prefixlen =
3152                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3153                                     (struct sockaddr *) (addr + 1),
3154                                     x->props.family);
3155         if (!addr->sadb_address_prefixlen)
3156                 BUG();
3157
3158         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3159         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3160         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3161         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3162         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3163         pol->sadb_x_policy_reserved = 0;
3164         pol->sadb_x_policy_id = xp->index;
3165         pol->sadb_x_policy_priority = xp->priority;
3166
3167         /* Set sadb_comb's. */
3168         if (x->id.proto == IPPROTO_AH)
3169                 dump_ah_combs(skb, t);
3170         else if (x->id.proto == IPPROTO_ESP)
3171                 dump_esp_combs(skb, t);
3172
3173         /* security context */
3174         if (xfrm_ctx) {
3175                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3176                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3177                 sec_ctx->sadb_x_sec_len =
3178                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3179                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3180                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3181                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3182                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3183                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3184                        xfrm_ctx->ctx_len);
3185         }
3186
3187         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3188 }
3189
3190 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3191                                                 u8 *data, int len, int *dir)
3192 {
3193         struct net *net = sock_net(sk);
3194         struct xfrm_policy *xp;
3195         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3196         struct sadb_x_sec_ctx *sec_ctx;
3197
3198         switch (sk->sk_family) {
3199         case AF_INET:
3200                 if (opt != IP_IPSEC_POLICY) {
3201                         *dir = -EOPNOTSUPP;
3202                         return NULL;
3203                 }
3204                 break;
3205 #if IS_ENABLED(CONFIG_IPV6)
3206         case AF_INET6:
3207                 if (opt != IPV6_IPSEC_POLICY) {
3208                         *dir = -EOPNOTSUPP;
3209                         return NULL;
3210                 }
3211                 break;
3212 #endif
3213         default:
3214                 *dir = -EINVAL;
3215                 return NULL;
3216         }
3217
3218         *dir = -EINVAL;
3219
3220         if (len < sizeof(struct sadb_x_policy) ||
3221             pol->sadb_x_policy_len*8 > len ||
3222             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3223             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3224                 return NULL;
3225
3226         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3227         if (xp == NULL) {
3228                 *dir = -ENOBUFS;
3229                 return NULL;
3230         }
3231
3232         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3233                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3234
3235         xp->lft.soft_byte_limit = XFRM_INF;
3236         xp->lft.hard_byte_limit = XFRM_INF;
3237         xp->lft.soft_packet_limit = XFRM_INF;
3238         xp->lft.hard_packet_limit = XFRM_INF;
3239         xp->family = sk->sk_family;
3240
3241         xp->xfrm_nr = 0;
3242         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3243             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3244                 goto out;
3245
3246         /* security context too */
3247         if (len >= (pol->sadb_x_policy_len*8 +
3248             sizeof(struct sadb_x_sec_ctx))) {
3249                 char *p = (char *)pol;
3250                 struct xfrm_user_sec_ctx *uctx;
3251
3252                 p += pol->sadb_x_policy_len*8;
3253                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3254                 if (len < pol->sadb_x_policy_len*8 +
3255                     sec_ctx->sadb_x_sec_len) {
3256                         *dir = -EINVAL;
3257                         goto out;
3258                 }
3259                 if ((*dir = verify_sec_ctx_len(p)))
3260                         goto out;
3261                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3262                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3263                 kfree(uctx);
3264
3265                 if (*dir)
3266                         goto out;
3267         }
3268
3269         *dir = pol->sadb_x_policy_dir-1;
3270         return xp;
3271
3272 out:
3273         xp->walk.dead = 1;
3274         xfrm_policy_destroy(xp);
3275         return NULL;
3276 }
3277
3278 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3279 {
3280         struct sk_buff *skb;
3281         struct sadb_msg *hdr;
3282         struct sadb_sa *sa;
3283         struct sadb_address *addr;
3284         struct sadb_x_nat_t_port *n_port;
3285         int sockaddr_size;
3286         int size;
3287         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3288         struct xfrm_encap_tmpl *natt = NULL;
3289
3290         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3291         if (!sockaddr_size)
3292                 return -EINVAL;
3293
3294         if (!satype)
3295                 return -EINVAL;
3296
3297         if (!x->encap)
3298                 return -EINVAL;
3299
3300         natt = x->encap;
3301
3302         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3303          *
3304          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3305          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3306          */
3307
3308         size = sizeof(struct sadb_msg) +
3309                 sizeof(struct sadb_sa) +
3310                 (sizeof(struct sadb_address) * 2) +
3311                 (sockaddr_size * 2) +
3312                 (sizeof(struct sadb_x_nat_t_port) * 2);
3313
3314         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3315         if (skb == NULL)
3316                 return -ENOMEM;
3317
3318         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3319         hdr->sadb_msg_version = PF_KEY_V2;
3320         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3321         hdr->sadb_msg_satype = satype;
3322         hdr->sadb_msg_len = size / sizeof(uint64_t);
3323         hdr->sadb_msg_errno = 0;
3324         hdr->sadb_msg_reserved = 0;
3325         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3326         hdr->sadb_msg_pid = 0;
3327
3328         /* SA */
3329         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3330         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3331         sa->sadb_sa_exttype = SADB_EXT_SA;
3332         sa->sadb_sa_spi = x->id.spi;
3333         sa->sadb_sa_replay = 0;
3334         sa->sadb_sa_state = 0;
3335         sa->sadb_sa_auth = 0;
3336         sa->sadb_sa_encrypt = 0;
3337         sa->sadb_sa_flags = 0;
3338
3339         /* ADDRESS_SRC (old addr) */
3340         addr = (struct sadb_address*)
3341                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3342         addr->sadb_address_len =
3343                 (sizeof(struct sadb_address)+sockaddr_size)/
3344                         sizeof(uint64_t);
3345         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3346         addr->sadb_address_proto = 0;
3347         addr->sadb_address_reserved = 0;
3348         addr->sadb_address_prefixlen =
3349                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3350                                     (struct sockaddr *) (addr + 1),
3351                                     x->props.family);
3352         if (!addr->sadb_address_prefixlen)
3353                 BUG();
3354
3355         /* NAT_T_SPORT (old port) */
3356         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3357         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3358         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3359         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3360         n_port->sadb_x_nat_t_port_reserved = 0;
3361
3362         /* ADDRESS_DST (new addr) */
3363         addr = (struct sadb_address*)
3364                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3365         addr->sadb_address_len =
3366                 (sizeof(struct sadb_address)+sockaddr_size)/
3367                         sizeof(uint64_t);
3368         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3369         addr->sadb_address_proto = 0;
3370         addr->sadb_address_reserved = 0;
3371         addr->sadb_address_prefixlen =
3372                 pfkey_sockaddr_fill(ipaddr, 0,
3373                                     (struct sockaddr *) (addr + 1),
3374                                     x->props.family);
3375         if (!addr->sadb_address_prefixlen)
3376                 BUG();
3377
3378         /* NAT_T_DPORT (new port) */
3379         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3380         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3381         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3382         n_port->sadb_x_nat_t_port_port = sport;
3383         n_port->sadb_x_nat_t_port_reserved = 0;
3384
3385         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3386 }
3387
3388 #ifdef CONFIG_NET_KEY_MIGRATE
3389 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3390                             const struct xfrm_selector *sel)
3391 {
3392         struct sadb_address *addr;
3393         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3394         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3395         addr->sadb_address_exttype = type;
3396         addr->sadb_address_proto = sel->proto;
3397         addr->sadb_address_reserved = 0;
3398
3399         switch (type) {
3400         case SADB_EXT_ADDRESS_SRC:
3401                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3402                 pfkey_sockaddr_fill(&sel->saddr, 0,
3403                                     (struct sockaddr *)(addr + 1),
3404                                     sel->family);
3405                 break;
3406         case SADB_EXT_ADDRESS_DST:
3407                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3408                 pfkey_sockaddr_fill(&sel->daddr, 0,
3409                                     (struct sockaddr *)(addr + 1),
3410                                     sel->family);
3411                 break;
3412         default:
3413                 return -EINVAL;
3414         }
3415
3416         return 0;
3417 }
3418
3419
3420 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3421 {
3422         struct sadb_x_kmaddress *kma;
3423         u8 *sa;
3424         int family = k->family;
3425         int socklen = pfkey_sockaddr_len(family);
3426         int size_req;
3427
3428         size_req = (sizeof(struct sadb_x_kmaddress) +
3429                     pfkey_sockaddr_pair_size(family));
3430
3431         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3432         memset(kma, 0, size_req);
3433         kma->sadb_x_kmaddress_len = size_req / 8;
3434         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3435         kma->sadb_x_kmaddress_reserved = k->reserved;
3436
3437         sa = (u8 *)(kma + 1);
3438         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3439             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3440                 return -EINVAL;
3441
3442         return 0;
3443 }
3444
3445 static int set_ipsecrequest(struct sk_buff *skb,
3446                             uint8_t proto, uint8_t mode, int level,
3447                             uint32_t reqid, uint8_t family,
3448                             const xfrm_address_t *src, const xfrm_address_t *dst)
3449 {
3450         struct sadb_x_ipsecrequest *rq;
3451         u8 *sa;
3452         int socklen = pfkey_sockaddr_len(family);
3453         int size_req;
3454
3455         size_req = sizeof(struct sadb_x_ipsecrequest) +
3456                    pfkey_sockaddr_pair_size(family);
3457
3458         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3459         memset(rq, 0, size_req);
3460         rq->sadb_x_ipsecrequest_len = size_req;
3461         rq->sadb_x_ipsecrequest_proto = proto;
3462         rq->sadb_x_ipsecrequest_mode = mode;
3463         rq->sadb_x_ipsecrequest_level = level;
3464         rq->sadb_x_ipsecrequest_reqid = reqid;
3465
3466         sa = (u8 *) (rq + 1);
3467         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3468             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3469                 return -EINVAL;
3470
3471         return 0;
3472 }
3473 #endif
3474
3475 #ifdef CONFIG_NET_KEY_MIGRATE
3476 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3477                               const struct xfrm_migrate *m, int num_bundles,
3478                               const struct xfrm_kmaddress *k)
3479 {
3480         int i;
3481         int sasize_sel;
3482         int size = 0;
3483         int size_pol = 0;
3484         struct sk_buff *skb;
3485         struct sadb_msg *hdr;
3486         struct sadb_x_policy *pol;
3487         const struct xfrm_migrate *mp;
3488
3489         if (type != XFRM_POLICY_TYPE_MAIN)
3490                 return 0;
3491
3492         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3493                 return -EINVAL;
3494
3495         if (k != NULL) {
3496                 /* addresses for KM */
3497                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3498                                      pfkey_sockaddr_pair_size(k->family));
3499         }
3500
3501         /* selector */
3502         sasize_sel = pfkey_sockaddr_size(sel->family);
3503         if (!sasize_sel)
3504                 return -EINVAL;
3505         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3506
3507         /* policy info */
3508         size_pol += sizeof(struct sadb_x_policy);
3509
3510         /* ipsecrequests */
3511         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3512                 /* old locator pair */
3513                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3514                             pfkey_sockaddr_pair_size(mp->old_family);
3515                 /* new locator pair */
3516                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3517                             pfkey_sockaddr_pair_size(mp->new_family);
3518         }
3519
3520         size += sizeof(struct sadb_msg) + size_pol;
3521
3522         /* alloc buffer */
3523         skb = alloc_skb(size, GFP_ATOMIC);
3524         if (skb == NULL)
3525                 return -ENOMEM;
3526
3527         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3528         hdr->sadb_msg_version = PF_KEY_V2;
3529         hdr->sadb_msg_type = SADB_X_MIGRATE;
3530         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3531         hdr->sadb_msg_len = size / 8;
3532         hdr->sadb_msg_errno = 0;
3533         hdr->sadb_msg_reserved = 0;
3534         hdr->sadb_msg_seq = 0;
3535         hdr->sadb_msg_pid = 0;
3536
3537         /* Addresses to be used by KM for negotiation, if ext is available */
3538         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3539                 goto err;
3540
3541         /* selector src */
3542         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3543
3544         /* selector dst */
3545         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3546
3547         /* policy information */
3548         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3549         pol->sadb_x_policy_len = size_pol / 8;
3550         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3551         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3552         pol->sadb_x_policy_dir = dir + 1;
3553         pol->sadb_x_policy_reserved = 0;
3554         pol->sadb_x_policy_id = 0;
3555         pol->sadb_x_policy_priority = 0;
3556
3557         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3558                 /* old ipsecrequest */
3559                 int mode = pfkey_mode_from_xfrm(mp->mode);
3560                 if (mode < 0)
3561                         goto err;
3562                 if (set_ipsecrequest(skb, mp->proto, mode,
3563                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3564                                      mp->reqid, mp->old_family,
3565                                      &mp->old_saddr, &mp->old_daddr) < 0)
3566                         goto err;
3567
3568                 /* new ipsecrequest */
3569                 if (set_ipsecrequest(skb, mp->proto, mode,
3570                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3571                                      mp->reqid, mp->new_family,
3572                                      &mp->new_saddr, &mp->new_daddr) < 0)
3573                         goto err;
3574         }
3575
3576         /* broadcast migrate message to sockets */
3577         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3578
3579         return 0;
3580
3581 err:
3582         kfree_skb(skb);
3583         return -EINVAL;
3584 }
3585 #else
3586 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3587                               const struct xfrm_migrate *m, int num_bundles,
3588                               const struct xfrm_kmaddress *k)
3589 {
3590         return -ENOPROTOOPT;
3591 }
3592 #endif
3593
3594 static int pfkey_sendmsg(struct kiocb *kiocb,
3595                          struct socket *sock, struct msghdr *msg, size_t len)
3596 {
3597         struct sock *sk = sock->sk;
3598         struct sk_buff *skb = NULL;
3599         struct sadb_msg *hdr = NULL;
3600         int err;
3601         struct net *net = sock_net(sk);
3602
3603         err = -EOPNOTSUPP;
3604         if (msg->msg_flags & MSG_OOB)
3605                 goto out;
3606
3607         err = -EMSGSIZE;
3608         if ((unsigned int)len > sk->sk_sndbuf - 32)
3609                 goto out;
3610
3611         err = -ENOBUFS;
3612         skb = alloc_skb(len, GFP_KERNEL);
3613         if (skb == NULL)
3614                 goto out;
3615
3616         err = -EFAULT;
3617         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3618                 goto out;
3619
3620         hdr = pfkey_get_base_msg(skb, &err);
3621         if (!hdr)
3622                 goto out;
3623
3624         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3625         err = pfkey_process(sk, skb, hdr);
3626         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3627
3628 out:
3629         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3630                 err = 0;
3631         kfree_skb(skb);
3632
3633         return err ? : len;
3634 }
3635
3636 static int pfkey_recvmsg(struct kiocb *kiocb,
3637                          struct socket *sock, struct msghdr *msg, size_t len,
3638                          int flags)
3639 {
3640         struct sock *sk = sock->sk;
3641         struct pfkey_sock *pfk = pfkey_sk(sk);
3642         struct sk_buff *skb;
3643         int copied, err;
3644
3645         err = -EINVAL;
3646         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3647                 goto out;
3648
3649         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3650         if (skb == NULL)
3651                 goto out;
3652
3653         copied = skb->len;
3654         if (copied > len) {
3655                 msg->msg_flags |= MSG_TRUNC;
3656                 copied = len;
3657         }
3658
3659         skb_reset_transport_header(skb);
3660         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3661         if (err)
3662                 goto out_free;
3663
3664         sock_recv_ts_and_drops(msg, sk, skb);
3665
3666         err = (flags & MSG_TRUNC) ? skb->len : copied;
3667
3668         if (pfk->dump.dump != NULL &&
3669             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3670                 pfkey_do_dump(pfk);
3671
3672 out_free:
3673         skb_free_datagram(sk, skb);
3674 out:
3675         return err;
3676 }
3677
3678 static const struct proto_ops pfkey_ops = {
3679         .family         =       PF_KEY,
3680         .owner          =       THIS_MODULE,
3681         /* Operations that make no sense on pfkey sockets. */
3682         .bind           =       sock_no_bind,
3683         .connect        =       sock_no_connect,
3684         .socketpair     =       sock_no_socketpair,
3685         .accept         =       sock_no_accept,
3686         .getname        =       sock_no_getname,
3687         .ioctl          =       sock_no_ioctl,
3688         .listen         =       sock_no_listen,
3689         .shutdown       =       sock_no_shutdown,
3690         .setsockopt     =       sock_no_setsockopt,
3691         .getsockopt     =       sock_no_getsockopt,
3692         .mmap           =       sock_no_mmap,
3693         .sendpage       =       sock_no_sendpage,
3694
3695         /* Now the operations that really occur. */
3696         .release        =       pfkey_release,
3697         .poll           =       datagram_poll,
3698         .sendmsg        =       pfkey_sendmsg,
3699         .recvmsg        =       pfkey_recvmsg,
3700 };
3701
3702 static const struct net_proto_family pfkey_family_ops = {
3703         .family =       PF_KEY,
3704         .create =       pfkey_create,
3705         .owner  =       THIS_MODULE,
3706 };
3707
3708 #ifdef CONFIG_PROC_FS
3709 static int pfkey_seq_show(struct seq_file *f, void *v)
3710 {
3711         struct sock *s = sk_entry(v);
3712
3713         if (v == SEQ_START_TOKEN)
3714                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3715         else
3716                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3717                                s,
3718                                atomic_read(&s->sk_refcnt),
3719                                sk_rmem_alloc_get(s),
3720                                sk_wmem_alloc_get(s),
3721                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3722                                sock_i_ino(s)
3723                                );
3724         return 0;
3725 }
3726
3727 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3728         __acquires(rcu)
3729 {
3730         struct net *net = seq_file_net(f);
3731         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3732
3733         rcu_read_lock();
3734         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3735 }
3736
3737 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3738 {
3739         struct net *net = seq_file_net(f);
3740         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3741
3742         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3743 }
3744
3745 static void pfkey_seq_stop(struct seq_file *f, void *v)
3746         __releases(rcu)
3747 {
3748         rcu_read_unlock();
3749 }
3750
3751 static const struct seq_operations pfkey_seq_ops = {
3752         .start  = pfkey_seq_start,
3753         .next   = pfkey_seq_next,
3754         .stop   = pfkey_seq_stop,
3755         .show   = pfkey_seq_show,
3756 };
3757
3758 static int pfkey_seq_open(struct inode *inode, struct file *file)
3759 {
3760         return seq_open_net(inode, file, &pfkey_seq_ops,
3761                             sizeof(struct seq_net_private));
3762 }
3763
3764 static const struct file_operations pfkey_proc_ops = {
3765         .open    = pfkey_seq_open,
3766         .read    = seq_read,
3767         .llseek  = seq_lseek,
3768         .release = seq_release_net,
3769 };
3770
3771 static int __net_init pfkey_init_proc(struct net *net)
3772 {
3773         struct proc_dir_entry *e;
3774
3775         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3776         if (e == NULL)
3777                 return -ENOMEM;
3778
3779         return 0;
3780 }
3781
3782 static void __net_exit pfkey_exit_proc(struct net *net)
3783 {
3784         remove_proc_entry("pfkey", net->proc_net);
3785 }
3786 #else
3787 static inline int pfkey_init_proc(struct net *net)
3788 {
3789         return 0;
3790 }
3791
3792 static inline void pfkey_exit_proc(struct net *net)
3793 {
3794 }
3795 #endif
3796
3797 static struct xfrm_mgr pfkeyv2_mgr =
3798 {
3799         .id             = "pfkeyv2",
3800         .notify         = pfkey_send_notify,
3801         .acquire        = pfkey_send_acquire,
3802         .compile_policy = pfkey_compile_policy,
3803         .new_mapping    = pfkey_send_new_mapping,
3804         .notify_policy  = pfkey_send_policy_notify,
3805         .migrate        = pfkey_send_migrate,
3806         .is_alive       = pfkey_is_alive,
3807 };
3808
3809 static int __net_init pfkey_net_init(struct net *net)
3810 {
3811         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3812         int rv;
3813
3814         INIT_HLIST_HEAD(&net_pfkey->table);
3815         atomic_set(&net_pfkey->socks_nr, 0);
3816
3817         rv = pfkey_init_proc(net);
3818
3819         return rv;
3820 }
3821
3822 static void __net_exit pfkey_net_exit(struct net *net)
3823 {
3824         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3825
3826         pfkey_exit_proc(net);
3827         BUG_ON(!hlist_empty(&net_pfkey->table));
3828 }
3829
3830 static struct pernet_operations pfkey_net_ops = {
3831         .init = pfkey_net_init,
3832         .exit = pfkey_net_exit,
3833         .id   = &pfkey_net_id,
3834         .size = sizeof(struct netns_pfkey),
3835 };
3836
3837 static void __exit ipsec_pfkey_exit(void)
3838 {
3839         xfrm_unregister_km(&pfkeyv2_mgr);
3840         sock_unregister(PF_KEY);
3841         unregister_pernet_subsys(&pfkey_net_ops);
3842         proto_unregister(&key_proto);
3843 }
3844
3845 static int __init ipsec_pfkey_init(void)
3846 {
3847         int err = proto_register(&key_proto, 0);
3848
3849         if (err != 0)
3850                 goto out;
3851
3852         err = register_pernet_subsys(&pfkey_net_ops);
3853         if (err != 0)
3854                 goto out_unregister_key_proto;
3855         err = sock_register(&pfkey_family_ops);
3856         if (err != 0)
3857                 goto out_unregister_pernet;
3858         err = xfrm_register_km(&pfkeyv2_mgr);
3859         if (err != 0)
3860                 goto out_sock_unregister;
3861 out:
3862         return err;
3863
3864 out_sock_unregister:
3865         sock_unregister(PF_KEY);
3866 out_unregister_pernet:
3867         unregister_pernet_subsys(&pfkey_net_ops);
3868 out_unregister_key_proto:
3869         proto_unregister(&key_proto);
3870         goto out;
3871 }
3872
3873 module_init(ipsec_pfkey_init);
3874 module_exit(ipsec_pfkey_exit);
3875 MODULE_LICENSE("GPL");
3876 MODULE_ALIAS_NETPROTO(PF_KEY);