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, (*skb2)->len);
 209                         *skb2 = NULL;
 210                         err = 0;
 211                 }
 212         }
 213         sock_put(sk);
 214         return err;
 215 }
 216
 217 /* Send SKB to all pfkey sockets matching selected criteria.  */
 218 #define BROADCAST_ALL           0
 219 #define BROADCAST_ONE           1
 220 #define BROADCAST_REGISTERED    2
 221 #define BROADCAST_PROMISC_ONLY  4
 222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 223                            int broadcast_flags, struct sock *one_sk,
 224                            struct net *net)
 225 {
 226         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 227         struct sock *sk;
 228         struct sk_buff *skb2 = NULL;
 229         int err = -ESRCH;
 230
 231         /* XXX Do we need something like netlink_overrun?  I think
 232          * XXX PF_KEY socket apps will not mind current behavior.
 233          */
 234         if (!skb)
 235                 return -ENOMEM;
 236
 237         rcu_read_lock();
 238         sk_for_each_rcu(sk, &net_pfkey->table) {
 239                 struct pfkey_sock *pfk = pfkey_sk(sk);
 240                 int err2;
 241
 242                 /* Yes, it means that if you are meant to receive this
 243                  * pfkey message you receive it twice as promiscuous
 244                  * socket.
 245                  */
 246                 if (pfk->promisc)
 247                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 248
 249                 /* the exact target will be processed later */
 250                 if (sk == one_sk)
 251                         continue;
 252                 if (broadcast_flags != BROADCAST_ALL) {
 253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 254                                 continue;
 255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 256                             !pfk->registered)
 257                                 continue;
 258                         if (broadcast_flags & BROADCAST_ONE)
 259                                 continue;
 260                 }
 261
 262                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 263
 264                 /* Error is cleare after succecful sending to at least one
 265                  * registered KM */
 266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 267                         err = err2;
 268         }
 269         rcu_read_unlock();
 270
 271         if (one_sk != NULL)
 272                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 273
 274         kfree_skb(skb2);
 275         kfree_skb(skb);
 276         return err;
 277 }
 278
 279 static int pfkey_do_dump(struct pfkey_sock *pfk)
 280 {
 281         struct sadb_msg *hdr;
 282         int rc;
 283
 284         rc = pfk->dump.dump(pfk);
 285         if (rc == -ENOBUFS)
 286                 return 0;
 287
 288         if (pfk->dump.skb) {
 289                 if (!pfkey_can_dump(&pfk->sk))
 290                         return 0;
 291
 292                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 293                 hdr->sadb_msg_seq = 0;
 294                 hdr->sadb_msg_errno = rc;
 295                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 296                                 &pfk->sk, sock_net(&pfk->sk));
 297                 pfk->dump.skb = NULL;
 298         }
 299
 300         pfkey_terminate_dump(pfk);
 301         return rc;
 302 }
 303
 304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 305                                  const struct sadb_msg *orig)
 306 {
 307         *new = *orig;
 308 }
 309
 310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 311 {
 312         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 313         struct sadb_msg *hdr;
 314
 315         if (!skb)
 316                 return -ENOBUFS;
 317
 318         /* Woe be to the platform trying to support PFKEY yet
 319          * having normal errnos outside the 1-255 range, inclusive.
 320          */
 321         err = -err;
 322         if (err == ERESTARTSYS ||
 323             err == ERESTARTNOHAND ||
 324             err == ERESTARTNOINTR)
 325                 err = EINTR;
 326         if (err >= 512)
 327                 err = EINVAL;
 328         BUG_ON(err <= 0 || err >= 256);
 329
 330         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 331         pfkey_hdr_dup(hdr, orig);
 332         hdr->sadb_msg_errno = (uint8_t) err;
 333         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 334                              sizeof(uint64_t));
 335
 336         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 337
 338         return 0;
 339 }
 340
 341 static 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 };
 369
 370 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 371 static int verify_address_len(const void *p)
 372 {
 373         const struct sadb_address *sp = p;
 374         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 375         const struct sockaddr_in *sin;
 376 #if IS_ENABLED(CONFIG_IPV6)
 377         const struct sockaddr_in6 *sin6;
 378 #endif
 379         int len;
 380
 381         switch (addr->sa_family) {
 382         case AF_INET:
 383                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 384                 if (sp->sadb_address_len != len ||
 385                     sp->sadb_address_prefixlen > 32)
 386                         return -EINVAL;
 387                 break;
 388 #if IS_ENABLED(CONFIG_IPV6)
 389         case AF_INET6:
 390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 391                 if (sp->sadb_address_len != len ||
 392                     sp->sadb_address_prefixlen > 128)
 393                         return -EINVAL;
 394                 break;
 395 #endif
 396         default:
 397                 /* It is user using kernel to keep track of security
 398                  * associations for another protocol, such as
 399                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 400                  * lengths.
 401                  *
 402                  * XXX Actually, association/policy database is not yet
 403                  * XXX able to cope with arbitrary sockaddr families.
 404                  * XXX When it can, remove this -EINVAL.  -DaveM
 405                  */
 406                 return -EINVAL;
 407                 break;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 414 {
 415         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 416                             sec_ctx->sadb_x_ctx_len,
 417                             sizeof(uint64_t));
 418 }
 419
 420 static inline int verify_sec_ctx_len(const void *p)
 421 {
 422         const struct sadb_x_sec_ctx *sec_ctx = p;
 423         int len = sec_ctx->sadb_x_ctx_len;
 424
 425         if (len > PAGE_SIZE)
 426                 return -EINVAL;
 427
 428         len = pfkey_sec_ctx_len(sec_ctx);
 429
 430         if (sec_ctx->sadb_x_sec_len != len)
 431                 return -EINVAL;
 432
 433         return 0;
 434 }
 435
 436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
 437 {
 438         struct xfrm_user_sec_ctx *uctx = NULL;
 439         int ctx_size = sec_ctx->sadb_x_ctx_len;
 440
 441         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 442
 443         if (!uctx)
 444                 return NULL;
 445
 446         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 447         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 448         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 449         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 450         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 451         memcpy(uctx + 1, sec_ctx + 1,
 452                uctx->ctx_len);
 453
 454         return uctx;
 455 }
 456
 457 static int present_and_same_family(const struct sadb_address *src,
 458                                    const struct sadb_address *dst)
 459 {
 460         const struct sockaddr *s_addr, *d_addr;
 461
 462         if (!src || !dst)
 463                 return 0;
 464
 465         s_addr = (const struct sockaddr *)(src + 1);
 466         d_addr = (const struct sockaddr *)(dst + 1);
 467         if (s_addr->sa_family != d_addr->sa_family)
 468                 return 0;
 469         if (s_addr->sa_family != AF_INET
 470 #if IS_ENABLED(CONFIG_IPV6)
 471             && s_addr->sa_family != AF_INET6
 472 #endif
 473                 )
 474                 return 0;
 475
 476         return 1;
 477 }
 478
 479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 480 {
 481         const char *p = (char *) hdr;
 482         int len = skb->len;
 483
 484         len -= sizeof(*hdr);
 485         p += sizeof(*hdr);
 486         while (len > 0) {
 487                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 488                 uint16_t ext_type;
 489                 int ext_len;
 490
 491                 ext_len  = ehdr->sadb_ext_len;
 492                 ext_len *= sizeof(uint64_t);
 493                 ext_type = ehdr->sadb_ext_type;
 494                 if (ext_len < sizeof(uint64_t) ||
 495                     ext_len > len ||
 496                     ext_type == SADB_EXT_RESERVED)
 497                         return -EINVAL;
 498
 499                 if (ext_type <= SADB_EXT_MAX) {
 500                         int min = (int) sadb_ext_min_len[ext_type];
 501                         if (ext_len < min)
 502                                 return -EINVAL;
 503                         if (ext_hdrs[ext_type-1] != NULL)
 504                                 return -EINVAL;
 505                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 506                             ext_type == SADB_EXT_ADDRESS_DST ||
 507                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 508                             ext_type == SADB_X_EXT_NAT_T_OA) {
 509                                 if (verify_address_len(p))
 510                                         return -EINVAL;
 511                         }
 512                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 513                                 if (verify_sec_ctx_len(p))
 514                                         return -EINVAL;
 515                         }
 516                         ext_hdrs[ext_type-1] = (void *) p;
 517                 }
 518                 p   += ext_len;
 519                 len -= ext_len;
 520         }
 521
 522         return 0;
 523 }
 524
 525 static uint16_t
 526 pfkey_satype2proto(uint8_t satype)
 527 {
 528         switch (satype) {
 529         case SADB_SATYPE_UNSPEC:
 530                 return IPSEC_PROTO_ANY;
 531         case SADB_SATYPE_AH:
 532                 return IPPROTO_AH;
 533         case SADB_SATYPE_ESP:
 534                 return IPPROTO_ESP;
 535         case SADB_X_SATYPE_IPCOMP:
 536                 return IPPROTO_COMP;
 537                 break;
 538         default:
 539                 return 0;
 540         }
 541         /* NOTREACHED */
 542 }
 543
 544 static uint8_t
 545 pfkey_proto2satype(uint16_t proto)
 546 {
 547         switch (proto) {
 548         case IPPROTO_AH:
 549                 return SADB_SATYPE_AH;
 550         case IPPROTO_ESP:
 551                 return SADB_SATYPE_ESP;
 552         case IPPROTO_COMP:
 553                 return SADB_X_SATYPE_IPCOMP;
 554                 break;
 555         default:
 556                 return 0;
 557         }
 558         /* NOTREACHED */
 559 }
 560
 561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 562  * say specifically 'just raw sockets' as we encode them as 255.
 563  */
 564
 565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 566 {
 567         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 568 }
 569
 570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 571 {
 572         return proto ? proto : IPSEC_PROTO_ANY;
 573 }
 574
 575 static inline int pfkey_sockaddr_len(sa_family_t family)
 576 {
 577         switch (family) {
 578         case AF_INET:
 579                 return sizeof(struct sockaddr_in);
 580 #if IS_ENABLED(CONFIG_IPV6)
 581         case AF_INET6:
 582                 return sizeof(struct sockaddr_in6);
 583 #endif
 584         }
 585         return 0;
 586 }
 587
 588 static
 589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 590 {
 591         switch (sa->sa_family) {
 592         case AF_INET:
 593                 xaddr->a4 =
 594                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 595                 return AF_INET;
 596 #if IS_ENABLED(CONFIG_IPV6)
 597         case AF_INET6:
 598                 memcpy(xaddr->a6,
 599                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 600                        sizeof(struct in6_addr));
 601                 return AF_INET6;
 602 #endif
 603         }
 604         return 0;
 605 }
 606
 607 static
 608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 609 {
 610         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 611                                       xaddr);
 612 }
 613
 614 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 615 {
 616         const struct sadb_sa *sa;
 617         const struct sadb_address *addr;
 618         uint16_t proto;
 619         unsigned short family;
 620         xfrm_address_t *xaddr;
 621
 622         sa = ext_hdrs[SADB_EXT_SA - 1];
 623         if (sa == NULL)
 624                 return NULL;
 625
 626         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 627         if (proto == 0)
 628                 return NULL;
 629
 630         /* sadb_address_len should be checked by caller */
 631         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 632         if (addr == NULL)
 633                 return NULL;
 634
 635         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 636         switch (family) {
 637         case AF_INET:
 638                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 639                 break;
 640 #if IS_ENABLED(CONFIG_IPV6)
 641         case AF_INET6:
 642                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 643                 break;
 644 #endif
 645         default:
 646                 xaddr = NULL;
 647         }
 648
 649         if (!xaddr)
 650                 return NULL;
 651
 652         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 653 }
 654
 655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 656
 657 static int
 658 pfkey_sockaddr_size(sa_family_t family)
 659 {
 660         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 661 }
 662
 663 static inline int pfkey_mode_from_xfrm(int mode)
 664 {
 665         switch(mode) {
 666         case XFRM_MODE_TRANSPORT:
 667                 return IPSEC_MODE_TRANSPORT;
 668         case XFRM_MODE_TUNNEL:
 669                 return IPSEC_MODE_TUNNEL;
 670         case XFRM_MODE_BEET:
 671                 return IPSEC_MODE_BEET;
 672         default:
 673                 return -1;
 674         }
 675 }
 676
 677 static inline int pfkey_mode_to_xfrm(int mode)
 678 {
 679         switch(mode) {
 680         case IPSEC_MODE_ANY:    /*XXX*/
 681         case IPSEC_MODE_TRANSPORT:
 682                 return XFRM_MODE_TRANSPORT;
 683         case IPSEC_MODE_TUNNEL:
 684                 return XFRM_MODE_TUNNEL;
 685         case IPSEC_MODE_BEET:
 686                 return XFRM_MODE_BEET;
 687         default:
 688                 return -1;
 689         }
 690 }
 691
 692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 693                                         struct sockaddr *sa,
 694                                         unsigned short family)
 695 {
 696         switch (family) {
 697         case AF_INET:
 698             {
 699                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 700                 sin->sin_family = AF_INET;
 701                 sin->sin_port = port;
 702                 sin->sin_addr.s_addr = xaddr->a4;
 703                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 704                 return 32;
 705             }
 706 #if IS_ENABLED(CONFIG_IPV6)
 707         case AF_INET6:
 708             {
 709                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 710                 sin6->sin6_family = AF_INET6;
 711                 sin6->sin6_port = port;
 712                 sin6->sin6_flowinfo = 0;
 713                 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
 714                 sin6->sin6_scope_id = 0;
 715                 return 128;
 716             }
 717 #endif
 718         }
 719         return 0;
 720 }
 721
 722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 723                                               int add_keys, int hsc)
 724 {
 725         struct sk_buff *skb;
 726         struct sadb_msg *hdr;
 727         struct sadb_sa *sa;
 728         struct sadb_lifetime *lifetime;
 729         struct sadb_address *addr;
 730         struct sadb_key *key;
 731         struct sadb_x_sa2 *sa2;
 732         struct sadb_x_sec_ctx *sec_ctx;
 733         struct xfrm_sec_ctx *xfrm_ctx;
 734         int ctx_size = 0;
 735         int size;
 736         int auth_key_size = 0;
 737         int encrypt_key_size = 0;
 738         int sockaddr_size;
 739         struct xfrm_encap_tmpl *natt = NULL;
 740         int mode;
 741
 742         /* address family check */
 743         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 744         if (!sockaddr_size)
 745                 return ERR_PTR(-EINVAL);
 746
 747         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 748            key(AE), (identity(SD),) (sensitivity)> */
 749         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 750                 sizeof(struct sadb_lifetime) +
 751                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 752                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 753                         sizeof(struct sadb_address)*2 +
 754                                 sockaddr_size*2 +
 755                                         sizeof(struct sadb_x_sa2);
 756
 757         if ((xfrm_ctx = x->security)) {
 758                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 759                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 760         }
 761
 762         /* identity & sensitivity */
 763         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 764                 size += sizeof(struct sadb_address) + sockaddr_size;
 765
 766         if (add_keys) {
 767                 if (x->aalg && x->aalg->alg_key_len) {
 768                         auth_key_size =
 769                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 770                         size += sizeof(struct sadb_key) + auth_key_size;
 771                 }
 772                 if (x->ealg && x->ealg->alg_key_len) {
 773                         encrypt_key_size =
 774                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 775                         size += sizeof(struct sadb_key) + encrypt_key_size;
 776                 }
 777         }
 778         if (x->encap)
 779                 natt = x->encap;
 780
 781         if (natt && natt->encap_type) {
 782                 size += sizeof(struct sadb_x_nat_t_type);
 783                 size += sizeof(struct sadb_x_nat_t_port);
 784                 size += sizeof(struct sadb_x_nat_t_port);
 785         }
 786
 787         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 788         if (skb == NULL)
 789                 return ERR_PTR(-ENOBUFS);
 790
 791         /* call should fill header later */
 792         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 793         memset(hdr, 0, size);   /* XXX do we need this ? */
 794         hdr->sadb_msg_len = size / sizeof(uint64_t);
 795
 796         /* sa */
 797         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 798         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 799         sa->sadb_sa_exttype = SADB_EXT_SA;
 800         sa->sadb_sa_spi = x->id.spi;
 801         sa->sadb_sa_replay = x->props.replay_window;
 802         switch (x->km.state) {
 803         case XFRM_STATE_VALID:
 804                 sa->sadb_sa_state = x->km.dying ?
 805                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 806                 break;
 807         case XFRM_STATE_ACQ:
 808                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 809                 break;
 810         default:
 811                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 812                 break;
 813         }
 814         sa->sadb_sa_auth = 0;
 815         if (x->aalg) {
 816                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 817                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 818                                         a->desc.sadb_alg_id : 0;
 819         }
 820         sa->sadb_sa_encrypt = 0;
 821         BUG_ON(x->ealg && x->calg);
 822         if (x->ealg) {
 823                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 824                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 825                                         a->desc.sadb_alg_id : 0;
 826         }
 827         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 828         if (x->calg) {
 829                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 830                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 831                                         a->desc.sadb_alg_id : 0;
 832         }
 833
 834         sa->sadb_sa_flags = 0;
 835         if (x->props.flags & XFRM_STATE_NOECN)
 836                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 837         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 838                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 839         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 840                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 841
 842         /* hard time */
 843         if (hsc & 2) {
 844                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 845                                                              sizeof(struct sadb_lifetime));
 846                 lifetime->sadb_lifetime_len =
 847                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 848                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 849                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 850                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 851                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 852                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 853         }
 854         /* soft time */
 855         if (hsc & 1) {
 856                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 857                                                              sizeof(struct sadb_lifetime));
 858                 lifetime->sadb_lifetime_len =
 859                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 860                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 861                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 862                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 863                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 864                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 865         }
 866         /* current time */
 867         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 868                                                      sizeof(struct sadb_lifetime));
 869         lifetime->sadb_lifetime_len =
 870                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 871         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 872         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 873         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 874         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 875         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 876         /* src address */
 877         addr = (struct sadb_address*) skb_put(skb,
 878                                               sizeof(struct sadb_address)+sockaddr_size);
 879         addr->sadb_address_len =
 880                 (sizeof(struct sadb_address)+sockaddr_size)/
 881                         sizeof(uint64_t);
 882         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 883         /* "if the ports are non-zero, then the sadb_address_proto field,
 884            normally zero, MUST be filled in with the transport
 885            protocol's number." - RFC2367 */
 886         addr->sadb_address_proto = 0;
 887         addr->sadb_address_reserved = 0;
 888
 889         addr->sadb_address_prefixlen =
 890                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 891                                     (struct sockaddr *) (addr + 1),
 892                                     x->props.family);
 893         if (!addr->sadb_address_prefixlen)
 894                 BUG();
 895
 896         /* dst address */
 897         addr = (struct sadb_address*) skb_put(skb,
 898                                               sizeof(struct sadb_address)+sockaddr_size);
 899         addr->sadb_address_len =
 900                 (sizeof(struct sadb_address)+sockaddr_size)/
 901                         sizeof(uint64_t);
 902         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 903         addr->sadb_address_proto = 0;
 904         addr->sadb_address_reserved = 0;
 905
 906         addr->sadb_address_prefixlen =
 907                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 908                                     (struct sockaddr *) (addr + 1),
 909                                     x->props.family);
 910         if (!addr->sadb_address_prefixlen)
 911                 BUG();
 912
 913         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 914                              x->props.family)) {
 915                 addr = (struct sadb_address*) skb_put(skb,
 916                         sizeof(struct sadb_address)+sockaddr_size);
 917                 addr->sadb_address_len =
 918                         (sizeof(struct sadb_address)+sockaddr_size)/
 919                         sizeof(uint64_t);
 920                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 921                 addr->sadb_address_proto =
 922                         pfkey_proto_from_xfrm(x->sel.proto);
 923                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 924                 addr->sadb_address_reserved = 0;
 925
 926                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 927                                     (struct sockaddr *) (addr + 1),
 928                                     x->props.family);
 929         }
 930
 931         /* auth key */
 932         if (add_keys && auth_key_size) {
 933                 key = (struct sadb_key *) skb_put(skb,
 934                                                   sizeof(struct sadb_key)+auth_key_size);
 935                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 936                         sizeof(uint64_t);
 937                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 938                 key->sadb_key_bits = x->aalg->alg_key_len;
 939                 key->sadb_key_reserved = 0;
 940                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 941         }
 942         /* encrypt key */
 943         if (add_keys && encrypt_key_size) {
 944                 key = (struct sadb_key *) skb_put(skb,
 945                                                   sizeof(struct sadb_key)+encrypt_key_size);
 946                 key->sadb_key_len = (sizeof(struct sadb_key) +
 947                                      encrypt_key_size) / sizeof(uint64_t);
 948                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 949                 key->sadb_key_bits = x->ealg->alg_key_len;
 950                 key->sadb_key_reserved = 0;
 951                 memcpy(key + 1, x->ealg->alg_key,
 952                        (x->ealg->alg_key_len+7)/8);
 953         }
 954
 955         /* sa */
 956         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 957         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 958         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 959         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 960                 kfree_skb(skb);
 961                 return ERR_PTR(-EINVAL);
 962         }
 963         sa2->sadb_x_sa2_mode = mode;
 964         sa2->sadb_x_sa2_reserved1 = 0;
 965         sa2->sadb_x_sa2_reserved2 = 0;
 966         sa2->sadb_x_sa2_sequence = 0;
 967         sa2->sadb_x_sa2_reqid = x->props.reqid;
 968
 969         if (natt && natt->encap_type) {
 970                 struct sadb_x_nat_t_type *n_type;
 971                 struct sadb_x_nat_t_port *n_port;
 972
 973                 /* type */
 974                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 975                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 976                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 977                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 978                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 979                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 980                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 981
 982                 /* source port */
 983                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 984                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 985                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 986                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 987                 n_port->sadb_x_nat_t_port_reserved = 0;
 988
 989                 /* dest port */
 990                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 991                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 992                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 993                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 994                 n_port->sadb_x_nat_t_port_reserved = 0;
 995         }
 996
 997         /* security context */
 998         if (xfrm_ctx) {
 999                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001                 sec_ctx->sadb_x_sec_len =
1002                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008                        xfrm_ctx->ctx_len);
1009         }
1010
1011         return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017         struct sk_buff *skb;
1018
1019         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021         return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025                                                           int hsc)
1026 {
1027         return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031                                                 const struct sadb_msg *hdr,
1032                                                 void * const *ext_hdrs)
1033 {
1034         struct xfrm_state *x;
1035         const struct sadb_lifetime *lifetime;
1036         const struct sadb_sa *sa;
1037         const struct sadb_key *key;
1038         const struct sadb_x_sec_ctx *sec_ctx;
1039         uint16_t proto;
1040         int err;
1041
1042
1043         sa = ext_hdrs[SADB_EXT_SA - 1];
1044         if (!sa ||
1045             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047                 return ERR_PTR(-EINVAL);
1048         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050                 return ERR_PTR(-EINVAL);
1051         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053                 return ERR_PTR(-EINVAL);
1054         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056                 return ERR_PTR(-EINVAL);
1057
1058         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059         if (proto == 0)
1060                 return ERR_PTR(-EINVAL);
1061
1062         /* default error is no buffer space */
1063         err = -ENOBUFS;
1064
1065         /* RFC2367:
1066
1067    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072    not true.
1073
1074            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076          */
1077         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081                 return ERR_PTR(-EINVAL);
1082         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083         if (key != NULL &&
1084             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085             ((key->sadb_key_bits+7) / 8 == 0 ||
1086              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087                 return ERR_PTR(-EINVAL);
1088         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089         if (key != NULL &&
1090             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091             ((key->sadb_key_bits+7) / 8 == 0 ||
1092              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093                 return ERR_PTR(-EINVAL);
1094
1095         x = xfrm_state_alloc(net);
1096         if (x == NULL)
1097                 return ERR_PTR(-ENOBUFS);
1098
1099         x->id.proto = proto;
1100         x->id.spi = sa->sadb_sa_spi;
1101         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1102                                         (sizeof(x->replay.bitmap) * 8));
1103         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1104                 x->props.flags |= XFRM_STATE_NOECN;
1105         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1106                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1107         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1108                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1109
1110         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1111         if (lifetime != NULL) {
1112                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1113                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1114                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1115                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1116         }
1117         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1118         if (lifetime != NULL) {
1119                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1120                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1121                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1122                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1123         }
1124
1125         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126         if (sec_ctx != NULL) {
1127                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1128
1129                 if (!uctx)
1130                         goto out;
1131
1132                 err = security_xfrm_state_alloc(x, uctx);
1133                 kfree(uctx);
1134
1135                 if (err)
1136                         goto out;
1137         }
1138
1139         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1140         if (sa->sadb_sa_auth) {
1141                 int keysize = 0;
1142                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143                 if (!a || !a->pfkey_supported) {
1144                         err = -ENOSYS;
1145                         goto out;
1146                 }
1147                 if (key)
1148                         keysize = (key->sadb_key_bits + 7) / 8;
1149                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1150                 if (!x->aalg)
1151                         goto out;
1152                 strcpy(x->aalg->alg_name, a->name);
1153                 x->aalg->alg_key_len = 0;
1154                 if (key) {
1155                         x->aalg->alg_key_len = key->sadb_key_bits;
1156                         memcpy(x->aalg->alg_key, key+1, keysize);
1157                 }
1158                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1159                 x->props.aalgo = sa->sadb_sa_auth;
1160                 /* x->algo.flags = sa->sadb_sa_flags; */
1161         }
1162         if (sa->sadb_sa_encrypt) {
1163                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1164                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1165                         if (!a || !a->pfkey_supported) {
1166                                 err = -ENOSYS;
1167                                 goto out;
1168                         }
1169                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1170                         if (!x->calg)
1171                                 goto out;
1172                         strcpy(x->calg->alg_name, a->name);
1173                         x->props.calgo = sa->sadb_sa_encrypt;
1174                 } else {
1175                         int keysize = 0;
1176                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1177                         if (!a || !a->pfkey_supported) {
1178                                 err = -ENOSYS;
1179                                 goto out;
1180                         }
1181                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1182                         if (key)
1183                                 keysize = (key->sadb_key_bits + 7) / 8;
1184                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1185                         if (!x->ealg)
1186                                 goto out;
1187                         strcpy(x->ealg->alg_name, a->name);
1188                         x->ealg->alg_key_len = 0;
1189                         if (key) {
1190                                 x->ealg->alg_key_len = key->sadb_key_bits;
1191                                 memcpy(x->ealg->alg_key, key+1, keysize);
1192                         }
1193                         x->props.ealgo = sa->sadb_sa_encrypt;
1194                 }
1195         }
1196         /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199                                                     &x->props.saddr);
1200         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201                                   &x->id.daddr);
1202
1203         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206                 if (mode < 0) {
1207                         err = -EINVAL;
1208                         goto out;
1209                 }
1210                 x->props.mode = mode;
1211                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212         }
1213
1214         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217                 /* Nobody uses this, but we try. */
1218                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220         }
1221
1222         if (!x->sel.family)
1223                 x->sel.family = x->props.family;
1224
1225         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226                 const struct sadb_x_nat_t_type* n_type;
1227                 struct xfrm_encap_tmpl *natt;
1228
1229                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230                 if (!x->encap)
1231                         goto out;
1232
1233                 natt = x->encap;
1234                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238                         const struct sadb_x_nat_t_port *n_port =
1239                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241                 }
1242                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243                         const struct sadb_x_nat_t_port *n_port =
1244                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246                 }
1247                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248         }
1249
1250         err = xfrm_init_state(x);
1251         if (err)
1252                 goto out;
1253
1254         x->km.seq = hdr->sadb_msg_seq;
1255         return x;
1256
1257 out:
1258         x->km.state = XFRM_STATE_DEAD;
1259         xfrm_state_put(x);
1260         return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265         return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270         struct net *net = sock_net(sk);
1271         struct sk_buff *resp_skb;
1272         struct sadb_x_sa2 *sa2;
1273         struct sadb_address *saddr, *daddr;
1274         struct sadb_msg *out_hdr;
1275         struct sadb_spirange *range;
1276         struct xfrm_state *x = NULL;
1277         int mode;
1278         int err;
1279         u32 min_spi, max_spi;
1280         u32 reqid;
1281         u8 proto;
1282         unsigned short family;
1283         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287                 return -EINVAL;
1288
1289         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290         if (proto == 0)
1291                 return -EINVAL;
1292
1293         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295                 if (mode < 0)
1296                         return -EINVAL;
1297                 reqid = sa2->sadb_x_sa2_reqid;
1298         } else {
1299                 mode = 0;
1300                 reqid = 0;
1301         }
1302
1303         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307         switch (family) {
1308         case AF_INET:
1309                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311                 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313         case AF_INET6:
1314                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316                 break;
1317 #endif
1318         }
1319
1320         if (hdr->sadb_msg_seq) {
1321                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323                         xfrm_state_put(x);
1324                         x = NULL;
1325                 }
1326         }
1327
1328         if (!x)
1329                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331         if (x == NULL)
1332                 return -ENOENT;
1333
1334         min_spi = 0x100;
1335         max_spi = 0x0fffffff;
1336
1337         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338         if (range) {
1339                 min_spi = range->sadb_spirange_min;
1340                 max_spi = range->sadb_spirange_max;
1341         }
1342
1343         err = xfrm_alloc_spi(x, min_spi, max_spi);
1344         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1345
1346         if (IS_ERR(resp_skb)) {
1347                 xfrm_state_put(x);
1348                 return  PTR_ERR(resp_skb);
1349         }
1350
1351         out_hdr = (struct sadb_msg *) resp_skb->data;
1352         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1353         out_hdr->sadb_msg_type = SADB_GETSPI;
1354         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1355         out_hdr->sadb_msg_errno = 0;
1356         out_hdr->sadb_msg_reserved = 0;
1357         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1358         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1359
1360         xfrm_state_put(x);
1361
1362         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1363
1364         return 0;
1365 }
1366
1367 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1368 {
1369         struct net *net = sock_net(sk);
1370         struct xfrm_state *x;
1371
1372         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1373                 return -EOPNOTSUPP;
1374
1375         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1376                 return 0;
1377
1378         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379         if (x == NULL)
1380                 return 0;
1381
1382         spin_lock_bh(&x->lock);
1383         if (x->km.state == XFRM_STATE_ACQ) {
1384                 x->km.state = XFRM_STATE_ERROR;
1385                 wake_up(&net->xfrm.km_waitq);
1386         }
1387         spin_unlock_bh(&x->lock);
1388         xfrm_state_put(x);
1389         return 0;
1390 }
1391
1392 static inline int event2poltype(int event)
1393 {
1394         switch (event) {
1395         case XFRM_MSG_DELPOLICY:
1396                 return SADB_X_SPDDELETE;
1397         case XFRM_MSG_NEWPOLICY:
1398                 return SADB_X_SPDADD;
1399         case XFRM_MSG_UPDPOLICY:
1400                 return SADB_X_SPDUPDATE;
1401         case XFRM_MSG_POLEXPIRE:
1402         //      return SADB_X_SPDEXPIRE;
1403         default:
1404                 pr_err("pfkey: Unknown policy event %d\n", event);
1405                 break;
1406         }
1407
1408         return 0;
1409 }
1410
1411 static inline int event2keytype(int event)
1412 {
1413         switch (event) {
1414         case XFRM_MSG_DELSA:
1415                 return SADB_DELETE;
1416         case XFRM_MSG_NEWSA:
1417                 return SADB_ADD;
1418         case XFRM_MSG_UPDSA:
1419                 return SADB_UPDATE;
1420         case XFRM_MSG_EXPIRE:
1421                 return SADB_EXPIRE;
1422         default:
1423                 pr_err("pfkey: Unknown SA event %d\n", event);
1424                 break;
1425         }
1426
1427         return 0;
1428 }
1429
1430 /* ADD/UPD/DEL */
1431 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1432 {
1433         struct sk_buff *skb;
1434         struct sadb_msg *hdr;
1435
1436         skb = pfkey_xfrm_state2msg(x);
1437
1438         if (IS_ERR(skb))
1439                 return PTR_ERR(skb);
1440
1441         hdr = (struct sadb_msg *) skb->data;
1442         hdr->sadb_msg_version = PF_KEY_V2;
1443         hdr->sadb_msg_type = event2keytype(c->event);
1444         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1445         hdr->sadb_msg_errno = 0;
1446         hdr->sadb_msg_reserved = 0;
1447         hdr->sadb_msg_seq = c->seq;
1448         hdr->sadb_msg_pid = c->portid;
1449
1450         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1451
1452         return 0;
1453 }
1454
1455 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1456 {
1457         struct net *net = sock_net(sk);
1458         struct xfrm_state *x;
1459         int err;
1460         struct km_event c;
1461
1462         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1463         if (IS_ERR(x))
1464                 return PTR_ERR(x);
1465
1466         xfrm_state_hold(x);
1467         if (hdr->sadb_msg_type == SADB_ADD)
1468                 err = xfrm_state_add(x);
1469         else
1470                 err = xfrm_state_update(x);
1471
1472         xfrm_audit_state_add(x, err ? 0 : 1,
1473                              audit_get_loginuid(current),
1474                              audit_get_sessionid(current), 0);
1475
1476         if (err < 0) {
1477                 x->km.state = XFRM_STATE_DEAD;
1478                 __xfrm_state_put(x);
1479                 goto out;
1480         }
1481
1482         if (hdr->sadb_msg_type == SADB_ADD)
1483                 c.event = XFRM_MSG_NEWSA;
1484         else
1485                 c.event = XFRM_MSG_UPDSA;
1486         c.seq = hdr->sadb_msg_seq;
1487         c.portid = hdr->sadb_msg_pid;
1488         km_state_notify(x, &c);
1489 out:
1490         xfrm_state_put(x);
1491         return err;
1492 }
1493
1494 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1495 {
1496         struct net *net = sock_net(sk);
1497         struct xfrm_state *x;
1498         struct km_event c;
1499         int err;
1500
1501         if (!ext_hdrs[SADB_EXT_SA-1] ||
1502             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1503                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1504                 return -EINVAL;
1505
1506         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1507         if (x == NULL)
1508                 return -ESRCH;
1509
1510         if ((err = security_xfrm_state_delete(x)))
1511                 goto out;
1512
1513         if (xfrm_state_kern(x)) {
1514                 err = -EPERM;
1515                 goto out;
1516         }
1517
1518         err = xfrm_state_delete(x);
1519
1520         if (err < 0)
1521                 goto out;
1522
1523         c.seq = hdr->sadb_msg_seq;
1524         c.portid = hdr->sadb_msg_pid;
1525         c.event = XFRM_MSG_DELSA;
1526         km_state_notify(x, &c);
1527 out:
1528         xfrm_audit_state_delete(x, err ? 0 : 1,
1529                                 audit_get_loginuid(current),
1530                                 audit_get_sessionid(current), 0);
1531         xfrm_state_put(x);
1532
1533         return err;
1534 }
1535
1536 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1537 {
1538         struct net *net = sock_net(sk);
1539         __u8 proto;
1540         struct sk_buff *out_skb;
1541         struct sadb_msg *out_hdr;
1542         struct xfrm_state *x;
1543
1544         if (!ext_hdrs[SADB_EXT_SA-1] ||
1545             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1546                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1547                 return -EINVAL;
1548
1549         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1550         if (x == NULL)
1551                 return -ESRCH;
1552
1553         out_skb = pfkey_xfrm_state2msg(x);
1554         proto = x->id.proto;
1555         xfrm_state_put(x);
1556         if (IS_ERR(out_skb))
1557                 return  PTR_ERR(out_skb);
1558
1559         out_hdr = (struct sadb_msg *) out_skb->data;
1560         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1561         out_hdr->sadb_msg_type = SADB_GET;
1562         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1563         out_hdr->sadb_msg_errno = 0;
1564         out_hdr->sadb_msg_reserved = 0;
1565         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1566         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1567         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1568
1569         return 0;
1570 }
1571
1572 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1573                                               gfp_t allocation)
1574 {
1575         struct sk_buff *skb;
1576         struct sadb_msg *hdr;
1577         int len, auth_len, enc_len, i;
1578
1579         auth_len = xfrm_count_pfkey_auth_supported();
1580         if (auth_len) {
1581                 auth_len *= sizeof(struct sadb_alg);
1582                 auth_len += sizeof(struct sadb_supported);
1583         }
1584
1585         enc_len = xfrm_count_pfkey_enc_supported();
1586         if (enc_len) {
1587                 enc_len *= sizeof(struct sadb_alg);
1588                 enc_len += sizeof(struct sadb_supported);
1589         }
1590
1591         len = enc_len + auth_len + sizeof(struct sadb_msg);
1592
1593         skb = alloc_skb(len + 16, allocation);
1594         if (!skb)
1595                 goto out_put_algs;
1596
1597         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1598         pfkey_hdr_dup(hdr, orig);
1599         hdr->sadb_msg_errno = 0;
1600         hdr->sadb_msg_len = len / sizeof(uint64_t);
1601
1602         if (auth_len) {
1603                 struct sadb_supported *sp;
1604                 struct sadb_alg *ap;
1605
1606                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1607                 ap = (struct sadb_alg *) (sp + 1);
1608
1609                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1610                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1611
1612                 for (i = 0; ; i++) {
1613                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1614                         if (!aalg)
1615                                 break;
1616                         if (!aalg->pfkey_supported)
1617                                 continue;
1618                         if (aalg->available)
1619                                 *ap++ = aalg->desc;
1620                 }
1621         }
1622
1623         if (enc_len) {
1624                 struct sadb_supported *sp;
1625                 struct sadb_alg *ap;
1626
1627                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1628                 ap = (struct sadb_alg *) (sp + 1);
1629
1630                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1631                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1632
1633                 for (i = 0; ; i++) {
1634                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1635                         if (!ealg)
1636                                 break;
1637                         if (!ealg->pfkey_supported)
1638                                 continue;
1639                         if (ealg->available)
1640                                 *ap++ = ealg->desc;
1641                 }
1642         }
1643
1644 out_put_algs:
1645         return skb;
1646 }
1647
1648 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1649 {
1650         struct pfkey_sock *pfk = pfkey_sk(sk);
1651         struct sk_buff *supp_skb;
1652
1653         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1654                 return -EINVAL;
1655
1656         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1657                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1658                         return -EEXIST;
1659                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1660         }
1661
1662         xfrm_probe_algs();
1663
1664         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1665         if (!supp_skb) {
1666                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1667                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1668
1669                 return -ENOBUFS;
1670         }
1671
1672         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1673
1674         return 0;
1675 }
1676
1677 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1678 {
1679         struct sk_buff *skb;
1680         struct sadb_msg *hdr;
1681
1682         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1683         if (!skb)
1684                 return -ENOBUFS;
1685
1686         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1687         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1688         hdr->sadb_msg_errno = (uint8_t) 0;
1689         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1690
1691         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1692 }
1693
1694 static int key_notify_sa_flush(const struct km_event *c)
1695 {
1696         struct sk_buff *skb;
1697         struct sadb_msg *hdr;
1698
1699         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1700         if (!skb)
1701                 return -ENOBUFS;
1702         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1703         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1704         hdr->sadb_msg_type = SADB_FLUSH;
1705         hdr->sadb_msg_seq = c->seq;
1706         hdr->sadb_msg_pid = c->portid;
1707         hdr->sadb_msg_version = PF_KEY_V2;
1708         hdr->sadb_msg_errno = (uint8_t) 0;
1709         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1710         hdr->sadb_msg_reserved = 0;
1711
1712         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1713
1714         return 0;
1715 }
1716
1717 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1718 {
1719         struct net *net = sock_net(sk);
1720         unsigned int proto;
1721         struct km_event c;
1722         struct xfrm_audit audit_info;
1723         int err, err2;
1724
1725         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1726         if (proto == 0)
1727                 return -EINVAL;
1728
1729         audit_info.loginuid = audit_get_loginuid(current);
1730         audit_info.sessionid = audit_get_sessionid(current);
1731         audit_info.secid = 0;
1732         err = xfrm_state_flush(net, proto, &audit_info);
1733         err2 = unicast_flush_resp(sk, hdr);
1734         if (err || err2) {
1735                 if (err == -ESRCH) /* empty table - go quietly */
1736                         err = 0;
1737                 return err ? err : err2;
1738         }
1739
1740         c.data.proto = proto;
1741         c.seq = hdr->sadb_msg_seq;
1742         c.portid = hdr->sadb_msg_pid;
1743         c.event = XFRM_MSG_FLUSHSA;
1744         c.net = net;
1745         km_state_notify(NULL, &c);
1746
1747         return 0;
1748 }
1749
1750 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1751 {
1752         struct pfkey_sock *pfk = ptr;
1753         struct sk_buff *out_skb;
1754         struct sadb_msg *out_hdr;
1755
1756         if (!pfkey_can_dump(&pfk->sk))
1757                 return -ENOBUFS;
1758
1759         out_skb = pfkey_xfrm_state2msg(x);
1760         if (IS_ERR(out_skb))
1761                 return PTR_ERR(out_skb);
1762
1763         out_hdr = (struct sadb_msg *) out_skb->data;
1764         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1765         out_hdr->sadb_msg_type = SADB_DUMP;
1766         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1767         out_hdr->sadb_msg_errno = 0;
1768         out_hdr->sadb_msg_reserved = 0;
1769         out_hdr->sadb_msg_seq = count + 1;
1770         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1771
1772         if (pfk->dump.skb)
1773                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1774                                 &pfk->sk, sock_net(&pfk->sk));
1775         pfk->dump.skb = out_skb;
1776
1777         return 0;
1778 }
1779
1780 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1781 {
1782         struct net *net = sock_net(&pfk->sk);
1783         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1784 }
1785
1786 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1787 {
1788         xfrm_state_walk_done(&pfk->dump.u.state);
1789 }
1790
1791 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1792 {
1793         u8 proto;
1794         struct pfkey_sock *pfk = pfkey_sk(sk);
1795
1796         if (pfk->dump.dump != NULL)
1797                 return -EBUSY;
1798
1799         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1800         if (proto == 0)
1801                 return -EINVAL;
1802
1803         pfk->dump.msg_version = hdr->sadb_msg_version;
1804         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1805         pfk->dump.dump = pfkey_dump_sa;
1806         pfk->dump.done = pfkey_dump_sa_done;
1807         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1808
1809         return pfkey_do_dump(pfk);
1810 }
1811
1812 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1813 {
1814         struct pfkey_sock *pfk = pfkey_sk(sk);
1815         int satype = hdr->sadb_msg_satype;
1816         bool reset_errno = false;
1817
1818         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1819                 reset_errno = true;
1820                 if (satype != 0 && satype != 1)
1821                         return -EINVAL;
1822                 pfk->promisc = satype;
1823         }
1824         if (reset_errno && skb_cloned(skb))
1825                 skb = skb_copy(skb, GFP_KERNEL);
1826         else
1827                 skb = skb_clone(skb, GFP_KERNEL);
1828
1829         if (reset_errno && skb) {
1830                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1831                 new_hdr->sadb_msg_errno = 0;
1832         }
1833
1834         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1835         return 0;
1836 }
1837
1838 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1839 {
1840         int i;
1841         u32 reqid = *(u32*)ptr;
1842
1843         for (i=0; i<xp->xfrm_nr; i++) {
1844                 if (xp->xfrm_vec[i].reqid == reqid)
1845                         return -EEXIST;
1846         }
1847         return 0;
1848 }
1849
1850 static u32 gen_reqid(struct net *net)
1851 {
1852         struct xfrm_policy_walk walk;
1853         u32 start;
1854         int rc;
1855         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1856
1857         start = reqid;
1858         do {
1859                 ++reqid;
1860                 if (reqid == 0)
1861                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1862                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1863                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1864                 xfrm_policy_walk_done(&walk);
1865                 if (rc != -EEXIST)
1866                         return reqid;
1867         } while (reqid != start);
1868         return 0;
1869 }
1870
1871 static int
1872 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1873 {
1874         struct net *net = xp_net(xp);
1875         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1876         int mode;
1877
1878         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1879                 return -ELOOP;
1880
1881         if (rq->sadb_x_ipsecrequest_mode == 0)
1882                 return -EINVAL;
1883
1884         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1885         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1886                 return -EINVAL;
1887         t->mode = mode;
1888         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1889                 t->optional = 1;
1890         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1891                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1892                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1893                         t->reqid = 0;
1894                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1895                         return -ENOBUFS;
1896         }
1897
1898         /* addresses present only in tunnel mode */
1899         if (t->mode == XFRM_MODE_TUNNEL) {
1900                 u8 *sa = (u8 *) (rq + 1);
1901                 int family, socklen;
1902
1903                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1904                                                 &t->saddr);
1905                 if (!family)
1906                         return -EINVAL;
1907
1908                 socklen = pfkey_sockaddr_len(family);
1909                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1910                                            &t->id.daddr) != family)
1911                         return -EINVAL;
1912                 t->encap_family = family;
1913         } else
1914                 t->encap_family = xp->family;
1915
1916         /* No way to set this via kame pfkey */
1917         t->allalgs = 1;
1918         xp->xfrm_nr++;
1919         return 0;
1920 }
1921
1922 static int
1923 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1924 {
1925         int err;
1926         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1927         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1928
1929         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1930                 return -EINVAL;
1931
1932         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1933                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1934                         return err;
1935                 len -= rq->sadb_x_ipsecrequest_len;
1936                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1937         }
1938         return 0;
1939 }
1940
1941 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1942 {
1943   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1944
1945         if (xfrm_ctx) {
1946                 int len = sizeof(struct sadb_x_sec_ctx);
1947                 len += xfrm_ctx->ctx_len;
1948                 return PFKEY_ALIGN8(len);
1949         }
1950         return 0;
1951 }
1952
1953 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1954 {
1955         const struct xfrm_tmpl *t;
1956         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1957         int socklen = 0;
1958         int i;
1959
1960         for (i=0; i<xp->xfrm_nr; i++) {
1961                 t = xp->xfrm_vec + i;
1962                 socklen += pfkey_sockaddr_len(t->encap_family);
1963         }
1964
1965         return sizeof(struct sadb_msg) +
1966                 (sizeof(struct sadb_lifetime) * 3) +
1967                 (sizeof(struct sadb_address) * 2) +
1968                 (sockaddr_size * 2) +
1969                 sizeof(struct sadb_x_policy) +
1970                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1971                 (socklen * 2) +
1972                 pfkey_xfrm_policy2sec_ctx_size(xp);
1973 }
1974
1975 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1976 {
1977         struct sk_buff *skb;
1978         int size;
1979
1980         size = pfkey_xfrm_policy2msg_size(xp);
1981
1982         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1983         if (skb == NULL)
1984                 return ERR_PTR(-ENOBUFS);
1985
1986         return skb;
1987 }
1988
1989 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1990 {
1991         struct sadb_msg *hdr;
1992         struct sadb_address *addr;
1993         struct sadb_lifetime *lifetime;
1994         struct sadb_x_policy *pol;
1995         struct sadb_x_sec_ctx *sec_ctx;
1996         struct xfrm_sec_ctx *xfrm_ctx;
1997         int i;
1998         int size;
1999         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2000         int socklen = pfkey_sockaddr_len(xp->family);
2001
2002         size = pfkey_xfrm_policy2msg_size(xp);
2003
2004         /* call should fill header later */
2005         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2006         memset(hdr, 0, size);   /* XXX do we need this ? */
2007
2008         /* src address */
2009         addr = (struct sadb_address*) skb_put(skb,
2010                                               sizeof(struct sadb_address)+sockaddr_size);
2011         addr->sadb_address_len =
2012                 (sizeof(struct sadb_address)+sockaddr_size)/
2013                         sizeof(uint64_t);
2014         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2015         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2016         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2017         addr->sadb_address_reserved = 0;
2018         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2019                                  xp->selector.sport,
2020                                  (struct sockaddr *) (addr + 1),
2021                                  xp->family))
2022                 BUG();
2023
2024         /* dst address */
2025         addr = (struct sadb_address*) skb_put(skb,
2026                                               sizeof(struct sadb_address)+sockaddr_size);
2027         addr->sadb_address_len =
2028                 (sizeof(struct sadb_address)+sockaddr_size)/
2029                         sizeof(uint64_t);
2030         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2031         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2032         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2033         addr->sadb_address_reserved = 0;
2034
2035         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2036                             (struct sockaddr *) (addr + 1),
2037                             xp->family);
2038
2039         /* hard time */
2040         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2041                                                      sizeof(struct sadb_lifetime));
2042         lifetime->sadb_lifetime_len =
2043                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2044         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2045         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2046         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2047         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2048         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2049         /* soft time */
2050         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2051                                                      sizeof(struct sadb_lifetime));
2052         lifetime->sadb_lifetime_len =
2053                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2054         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2055         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2056         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2057         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2058         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2059         /* current time */
2060         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2061                                                      sizeof(struct sadb_lifetime));
2062         lifetime->sadb_lifetime_len =
2063                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2064         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2065         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2066         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2067         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2068         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2069
2070         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2071         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2072         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2073         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2074         if (xp->action == XFRM_POLICY_ALLOW) {
2075                 if (xp->xfrm_nr)
2076                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2077                 else
2078                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2079         }
2080         pol->sadb_x_policy_dir = dir+1;
2081         pol->sadb_x_policy_reserved = 0;
2082         pol->sadb_x_policy_id = xp->index;
2083         pol->sadb_x_policy_priority = xp->priority;
2084
2085         for (i=0; i<xp->xfrm_nr; i++) {
2086                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2087                 struct sadb_x_ipsecrequest *rq;
2088                 int req_size;
2089                 int mode;
2090
2091                 req_size = sizeof(struct sadb_x_ipsecrequest);
2092                 if (t->mode == XFRM_MODE_TUNNEL) {
2093                         socklen = pfkey_sockaddr_len(t->encap_family);
2094                         req_size += socklen * 2;
2095                 } else {
2096                         size -= 2*socklen;
2097                 }
2098                 rq = (void*)skb_put(skb, req_size);
2099                 pol->sadb_x_policy_len += req_size/8;
2100                 memset(rq, 0, sizeof(*rq));
2101                 rq->sadb_x_ipsecrequest_len = req_size;
2102                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2103                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2104                         return -EINVAL;
2105                 rq->sadb_x_ipsecrequest_mode = mode;
2106                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2107                 if (t->reqid)
2108                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2109                 if (t->optional)
2110                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2111                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2112
2113                 if (t->mode == XFRM_MODE_TUNNEL) {
2114                         u8 *sa = (void *)(rq + 1);
2115                         pfkey_sockaddr_fill(&t->saddr, 0,
2116                                             (struct sockaddr *)sa,
2117                                             t->encap_family);
2118                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2119                                             (struct sockaddr *) (sa + socklen),
2120                                             t->encap_family);
2121                 }
2122         }
2123
2124         /* security context */
2125         if ((xfrm_ctx = xp->security)) {
2126                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2127
2128                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2129                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2130                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2131                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2132                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2133                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2134                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2135                        xfrm_ctx->ctx_len);
2136         }
2137
2138         hdr->sadb_msg_len = size / sizeof(uint64_t);
2139         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2140
2141         return 0;
2142 }
2143
2144 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2145 {
2146         struct sk_buff *out_skb;
2147         struct sadb_msg *out_hdr;
2148         int err;
2149
2150         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2151         if (IS_ERR(out_skb))
2152                 return PTR_ERR(out_skb);
2153
2154         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2155         if (err < 0)
2156                 return err;
2157
2158         out_hdr = (struct sadb_msg *) out_skb->data;
2159         out_hdr->sadb_msg_version = PF_KEY_V2;
2160
2161         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2162                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2163         else
2164                 out_hdr->sadb_msg_type = event2poltype(c->event);
2165         out_hdr->sadb_msg_errno = 0;
2166         out_hdr->sadb_msg_seq = c->seq;
2167         out_hdr->sadb_msg_pid = c->portid;
2168         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2169         return 0;
2170
2171 }
2172
2173 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2174 {
2175         struct net *net = sock_net(sk);
2176         int err = 0;
2177         struct sadb_lifetime *lifetime;
2178         struct sadb_address *sa;
2179         struct sadb_x_policy *pol;
2180         struct xfrm_policy *xp;
2181         struct km_event c;
2182         struct sadb_x_sec_ctx *sec_ctx;
2183
2184         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2185                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2186             !ext_hdrs[SADB_X_EXT_POLICY-1])
2187                 return -EINVAL;
2188
2189         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2190         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2191                 return -EINVAL;
2192         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2193                 return -EINVAL;
2194
2195         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2196         if (xp == NULL)
2197                 return -ENOBUFS;
2198
2199         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2200                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2201         xp->priority = pol->sadb_x_policy_priority;
2202
2203         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2204         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2205         xp->selector.family = xp->family;
2206         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2207         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2208         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2209         if (xp->selector.sport)
2210                 xp->selector.sport_mask = htons(0xffff);
2211
2212         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2213         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2214         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2215
2216         /* Amusing, we set this twice.  KAME apps appear to set same value
2217          * in both addresses.
2218          */
2219         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2220
2221         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2222         if (xp->selector.dport)
2223                 xp->selector.dport_mask = htons(0xffff);
2224
2225         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2226         if (sec_ctx != NULL) {
2227                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2228
2229                 if (!uctx) {
2230                         err = -ENOBUFS;
2231                         goto out;
2232                 }
2233
2234                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2235                 kfree(uctx);
2236
2237                 if (err)
2238                         goto out;
2239         }
2240
2241         xp->lft.soft_byte_limit = XFRM_INF;
2242         xp->lft.hard_byte_limit = XFRM_INF;
2243         xp->lft.soft_packet_limit = XFRM_INF;
2244         xp->lft.hard_packet_limit = XFRM_INF;
2245         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2246                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2247                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2248                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2249                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2250         }
2251         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2252                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256         }
2257         xp->xfrm_nr = 0;
2258         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2259             (err = parse_ipsecrequests(xp, pol)) < 0)
2260                 goto out;
2261
2262         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2263                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2264
2265         xfrm_audit_policy_add(xp, err ? 0 : 1,
2266                               audit_get_loginuid(current),
2267                               audit_get_sessionid(current), 0);
2268
2269         if (err)
2270                 goto out;
2271
2272         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2273                 c.event = XFRM_MSG_UPDPOLICY;
2274         else
2275                 c.event = XFRM_MSG_NEWPOLICY;
2276
2277         c.seq = hdr->sadb_msg_seq;
2278         c.portid = hdr->sadb_msg_pid;
2279
2280         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2281         xfrm_pol_put(xp);
2282         return 0;
2283
2284 out:
2285         xp->walk.dead = 1;
2286         xfrm_policy_destroy(xp);
2287         return err;
2288 }
2289
2290 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2291 {
2292         struct net *net = sock_net(sk);
2293         int err;
2294         struct sadb_address *sa;
2295         struct sadb_x_policy *pol;
2296         struct xfrm_policy *xp;
2297         struct xfrm_selector sel;
2298         struct km_event c;
2299         struct sadb_x_sec_ctx *sec_ctx;
2300         struct xfrm_sec_ctx *pol_ctx = NULL;
2301
2302         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2303                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2304             !ext_hdrs[SADB_X_EXT_POLICY-1])
2305                 return -EINVAL;
2306
2307         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2308         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2309                 return -EINVAL;
2310
2311         memset(&sel, 0, sizeof(sel));
2312
2313         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2314         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2315         sel.prefixlen_s = sa->sadb_address_prefixlen;
2316         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2317         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2318         if (sel.sport)
2319                 sel.sport_mask = htons(0xffff);
2320
2321         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2322         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2323         sel.prefixlen_d = sa->sadb_address_prefixlen;
2324         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2325         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2326         if (sel.dport)
2327                 sel.dport_mask = htons(0xffff);
2328
2329         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2330         if (sec_ctx != NULL) {
2331                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2332
2333                 if (!uctx)
2334                         return -ENOMEM;
2335
2336                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2337                 kfree(uctx);
2338                 if (err)
2339                         return err;
2340         }
2341
2342         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2343                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2344                                    1, &err);
2345         security_xfrm_policy_free(pol_ctx);
2346         if (xp == NULL)
2347                 return -ENOENT;
2348
2349         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2350                                  audit_get_loginuid(current),
2351                                  audit_get_sessionid(current), 0);
2352
2353         if (err)
2354                 goto out;
2355
2356         c.seq = hdr->sadb_msg_seq;
2357         c.portid = hdr->sadb_msg_pid;
2358         c.data.byid = 0;
2359         c.event = XFRM_MSG_DELPOLICY;
2360         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2361
2362 out:
2363         xfrm_pol_put(xp);
2364         if (err == 0)
2365                 xfrm_garbage_collect(net);
2366         return err;
2367 }
2368
2369 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2370 {
2371         int err;
2372         struct sk_buff *out_skb;
2373         struct sadb_msg *out_hdr;
2374         err = 0;
2375
2376         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2377         if (IS_ERR(out_skb)) {
2378                 err =  PTR_ERR(out_skb);
2379                 goto out;
2380         }
2381         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2382         if (err < 0)
2383                 goto out;
2384
2385         out_hdr = (struct sadb_msg *) out_skb->data;
2386         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2387         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2388         out_hdr->sadb_msg_satype = 0;
2389         out_hdr->sadb_msg_errno = 0;
2390         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2391         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2392         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2393         err = 0;
2394
2395 out:
2396         return err;
2397 }
2398
2399 #ifdef CONFIG_NET_KEY_MIGRATE
2400 static int pfkey_sockaddr_pair_size(sa_family_t family)
2401 {
2402         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2403 }
2404
2405 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2406                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2407                                u16 *family)
2408 {
2409         int af, socklen;
2410
2411         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2412                 return -EINVAL;
2413
2414         af = pfkey_sockaddr_extract(sa, saddr);
2415         if (!af)
2416                 return -EINVAL;
2417
2418         socklen = pfkey_sockaddr_len(af);
2419         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2420                                    daddr) != af)
2421                 return -EINVAL;
2422
2423         *family = af;
2424         return 0;
2425 }
2426
2427 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2428                                     struct xfrm_migrate *m)
2429 {
2430         int err;
2431         struct sadb_x_ipsecrequest *rq2;
2432         int mode;
2433
2434         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2435             len < rq1->sadb_x_ipsecrequest_len)
2436                 return -EINVAL;
2437
2438         /* old endoints */
2439         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2440                                   rq1->sadb_x_ipsecrequest_len,
2441                                   &m->old_saddr, &m->old_daddr,
2442                                   &m->old_family);
2443         if (err)
2444                 return err;
2445
2446         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2447         len -= rq1->sadb_x_ipsecrequest_len;
2448
2449         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2450             len < rq2->sadb_x_ipsecrequest_len)
2451                 return -EINVAL;
2452
2453         /* new endpoints */
2454         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2455                                   rq2->sadb_x_ipsecrequest_len,
2456                                   &m->new_saddr, &m->new_daddr,
2457                                   &m->new_family);
2458         if (err)
2459                 return err;
2460
2461         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2462             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2463             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2464                 return -EINVAL;
2465
2466         m->proto = rq1->sadb_x_ipsecrequest_proto;
2467         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2468                 return -EINVAL;
2469         m->mode = mode;
2470         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2471
2472         return ((int)(rq1->sadb_x_ipsecrequest_len +
2473                       rq2->sadb_x_ipsecrequest_len));
2474 }
2475
2476 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2477                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2478 {
2479         int i, len, ret, err = -EINVAL;
2480         u8 dir;
2481         struct sadb_address *sa;
2482         struct sadb_x_kmaddress *kma;
2483         struct sadb_x_policy *pol;
2484         struct sadb_x_ipsecrequest *rq;
2485         struct xfrm_selector sel;
2486         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2487         struct xfrm_kmaddress k;
2488
2489         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2490                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2491             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2492                 err = -EINVAL;
2493                 goto out;
2494         }
2495
2496         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2497         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2498
2499         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2500                 err = -EINVAL;
2501                 goto out;
2502         }
2503
2504         if (kma) {
2505                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2506                 k.reserved = kma->sadb_x_kmaddress_reserved;
2507                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2508                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2509                                           &k.local, &k.remote, &k.family);
2510                 if (ret < 0) {
2511                         err = ret;
2512                         goto out;
2513                 }
2514         }
2515
2516         dir = pol->sadb_x_policy_dir - 1;
2517         memset(&sel, 0, sizeof(sel));
2518
2519         /* set source address info of selector */
2520         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2521         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2522         sel.prefixlen_s = sa->sadb_address_prefixlen;
2523         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2524         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2525         if (sel.sport)
2526                 sel.sport_mask = htons(0xffff);
2527
2528         /* set destination address info of selector */
2529         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2530         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2531         sel.prefixlen_d = sa->sadb_address_prefixlen;
2532         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2533         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2534         if (sel.dport)
2535                 sel.dport_mask = htons(0xffff);
2536
2537         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2538
2539         /* extract ipsecrequests */
2540         i = 0;
2541         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2542
2543         while (len > 0 && i < XFRM_MAX_DEPTH) {
2544                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2545                 if (ret < 0) {
2546                         err = ret;
2547                         goto out;
2548                 } else {
2549                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2550                         len -= ret;
2551                         i++;
2552                 }
2553         }
2554
2555         if (!i || len > 0) {
2556                 err = -EINVAL;
2557                 goto out;
2558         }
2559
2560         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2561                             kma ? &k : NULL);
2562
2563  out:
2564         return err;
2565 }
2566 #else
2567 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2568                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2569 {
2570         return -ENOPROTOOPT;
2571 }
2572 #endif
2573
2574
2575 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2576 {
2577         struct net *net = sock_net(sk);
2578         unsigned int dir;
2579         int err = 0, delete;
2580         struct sadb_x_policy *pol;
2581         struct xfrm_policy *xp;
2582         struct km_event c;
2583
2584         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2585                 return -EINVAL;
2586
2587         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2588         if (dir >= XFRM_POLICY_MAX)
2589                 return -EINVAL;
2590
2591         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2592         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2593                               dir, pol->sadb_x_policy_id, delete, &err);
2594         if (xp == NULL)
2595                 return -ENOENT;
2596
2597         if (delete) {
2598                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2599                                 audit_get_loginuid(current),
2600                                 audit_get_sessionid(current), 0);
2601
2602                 if (err)
2603                         goto out;
2604                 c.seq = hdr->sadb_msg_seq;
2605                 c.portid = hdr->sadb_msg_pid;
2606                 c.data.byid = 1;
2607                 c.event = XFRM_MSG_DELPOLICY;
2608                 km_policy_notify(xp, dir, &c);
2609         } else {
2610                 err = key_pol_get_resp(sk, xp, hdr, dir);
2611         }
2612
2613 out:
2614         xfrm_pol_put(xp);
2615         if (delete && err == 0)
2616                 xfrm_garbage_collect(net);
2617         return err;
2618 }
2619
2620 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2621 {
2622         struct pfkey_sock *pfk = ptr;
2623         struct sk_buff *out_skb;
2624         struct sadb_msg *out_hdr;
2625         int err;
2626
2627         if (!pfkey_can_dump(&pfk->sk))
2628                 return -ENOBUFS;
2629
2630         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2631         if (IS_ERR(out_skb))
2632                 return PTR_ERR(out_skb);
2633
2634         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2635         if (err < 0)
2636                 return err;
2637
2638         out_hdr = (struct sadb_msg *) out_skb->data;
2639         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2640         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2641         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2642         out_hdr->sadb_msg_errno = 0;
2643         out_hdr->sadb_msg_seq = count + 1;
2644         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2645
2646         if (pfk->dump.skb)
2647                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2648                                 &pfk->sk, sock_net(&pfk->sk));
2649         pfk->dump.skb = out_skb;
2650
2651         return 0;
2652 }
2653
2654 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2655 {
2656         struct net *net = sock_net(&pfk->sk);
2657         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2658 }
2659
2660 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2661 {
2662         xfrm_policy_walk_done(&pfk->dump.u.policy);
2663 }
2664
2665 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2666 {
2667         struct pfkey_sock *pfk = pfkey_sk(sk);
2668
2669         if (pfk->dump.dump != NULL)
2670                 return -EBUSY;
2671
2672         pfk->dump.msg_version = hdr->sadb_msg_version;
2673         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2674         pfk->dump.dump = pfkey_dump_sp;
2675         pfk->dump.done = pfkey_dump_sp_done;
2676         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2677
2678         return pfkey_do_dump(pfk);
2679 }
2680
2681 static int key_notify_policy_flush(const struct km_event *c)
2682 {
2683         struct sk_buff *skb_out;
2684         struct sadb_msg *hdr;
2685
2686         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2687         if (!skb_out)
2688                 return -ENOBUFS;
2689         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2690         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2691         hdr->sadb_msg_seq = c->seq;
2692         hdr->sadb_msg_pid = c->portid;
2693         hdr->sadb_msg_version = PF_KEY_V2;
2694         hdr->sadb_msg_errno = (uint8_t) 0;
2695         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2696         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2697         hdr->sadb_msg_reserved = 0;
2698         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2699         return 0;
2700
2701 }
2702
2703 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2704 {
2705         struct net *net = sock_net(sk);
2706         struct km_event c;
2707         struct xfrm_audit audit_info;
2708         int err, err2;
2709
2710         audit_info.loginuid = audit_get_loginuid(current);
2711         audit_info.sessionid = audit_get_sessionid(current);
2712         audit_info.secid = 0;
2713         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2714         err2 = unicast_flush_resp(sk, hdr);
2715         if (err || err2) {
2716                 if (err == -ESRCH) /* empty table - old silent behavior */
2717                         return 0;
2718                 return err;
2719         }
2720
2721         c.data.type = XFRM_POLICY_TYPE_MAIN;
2722         c.event = XFRM_MSG_FLUSHPOLICY;
2723         c.portid = hdr->sadb_msg_pid;
2724         c.seq = hdr->sadb_msg_seq;
2725         c.net = net;
2726         km_policy_notify(NULL, 0, &c);
2727
2728         return 0;
2729 }
2730
2731 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2732                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2733 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2734         [SADB_RESERVED]         = pfkey_reserved,
2735         [SADB_GETSPI]           = pfkey_getspi,
2736         [SADB_UPDATE]           = pfkey_add,
2737         [SADB_ADD]              = pfkey_add,
2738         [SADB_DELETE]           = pfkey_delete,
2739         [SADB_GET]              = pfkey_get,
2740         [SADB_ACQUIRE]          = pfkey_acquire,
2741         [SADB_REGISTER]         = pfkey_register,
2742         [SADB_EXPIRE]           = NULL,
2743         [SADB_FLUSH]            = pfkey_flush,
2744         [SADB_DUMP]             = pfkey_dump,
2745         [SADB_X_PROMISC]        = pfkey_promisc,
2746         [SADB_X_PCHANGE]        = NULL,
2747         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2748         [SADB_X_SPDADD]         = pfkey_spdadd,
2749         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2750         [SADB_X_SPDGET]         = pfkey_spdget,
2751         [SADB_X_SPDACQUIRE]     = NULL,
2752         [SADB_X_SPDDUMP]        = pfkey_spddump,
2753         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2754         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2755         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2756         [SADB_X_MIGRATE]        = pfkey_migrate,
2757 };
2758
2759 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2760 {
2761         void *ext_hdrs[SADB_EXT_MAX];
2762         int err;
2763
2764         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2765                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2766
2767         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2768         err = parse_exthdrs(skb, hdr, ext_hdrs);
2769         if (!err) {
2770                 err = -EOPNOTSUPP;
2771                 if (pfkey_funcs[hdr->sadb_msg_type])
2772                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2773         }
2774         return err;
2775 }
2776
2777 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2778 {
2779         struct sadb_msg *hdr = NULL;
2780
2781         if (skb->len < sizeof(*hdr)) {
2782                 *errp = -EMSGSIZE;
2783         } else {
2784                 hdr = (struct sadb_msg *) skb->data;
2785                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2786                     hdr->sadb_msg_reserved != 0 ||
2787                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2788                      hdr->sadb_msg_type > SADB_MAX)) {
2789                         hdr = NULL;
2790                         *errp = -EINVAL;
2791                 } else if (hdr->sadb_msg_len != (skb->len /
2792                                                  sizeof(uint64_t)) ||
2793                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2794                                                 sizeof(uint64_t))) {
2795                         hdr = NULL;
2796                         *errp = -EMSGSIZE;
2797                 } else {
2798                         *errp = 0;
2799                 }
2800         }
2801         return hdr;
2802 }
2803
2804 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2805                                 const struct xfrm_algo_desc *d)
2806 {
2807         unsigned int id = d->desc.sadb_alg_id;
2808
2809         if (id >= sizeof(t->aalgos) * 8)
2810                 return 0;
2811
2812         return (t->aalgos >> id) & 1;
2813 }
2814
2815 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2816                                 const struct xfrm_algo_desc *d)
2817 {
2818         unsigned int id = d->desc.sadb_alg_id;
2819
2820         if (id >= sizeof(t->ealgos) * 8)
2821                 return 0;
2822
2823         return (t->ealgos >> id) & 1;
2824 }
2825
2826 static int count_ah_combs(const struct xfrm_tmpl *t)
2827 {
2828         int i, sz = 0;
2829
2830         for (i = 0; ; i++) {
2831                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2832                 if (!aalg)
2833                         break;
2834                 if (!aalg->pfkey_supported)
2835                         continue;
2836                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2837                         sz += sizeof(struct sadb_comb);
2838         }
2839         return sz + sizeof(struct sadb_prop);
2840 }
2841
2842 static int count_esp_combs(const struct xfrm_tmpl *t)
2843 {
2844         int i, k, sz = 0;
2845
2846         for (i = 0; ; i++) {
2847                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2848                 if (!ealg)
2849                         break;
2850
2851                 if (!ealg->pfkey_supported)
2852                         continue;
2853
2854                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2855                         continue;
2856
2857                 for (k = 1; ; k++) {
2858                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2859                         if (!aalg)
2860                                 break;
2861
2862                         if (!aalg->pfkey_supported)
2863                                 continue;
2864
2865                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2866                                 sz += sizeof(struct sadb_comb);
2867                 }
2868         }
2869         return sz + sizeof(struct sadb_prop);
2870 }
2871
2872 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2873 {
2874         struct sadb_prop *p;
2875         int i;
2876
2877         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2878         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2879         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2880         p->sadb_prop_replay = 32;
2881         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2882
2883         for (i = 0; ; i++) {
2884                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2885                 if (!aalg)
2886                         break;
2887
2888                 if (!aalg->pfkey_supported)
2889                         continue;
2890
2891                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2892                         struct sadb_comb *c;
2893                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2894                         memset(c, 0, sizeof(*c));
2895                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2896                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2897                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2898                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2899                         c->sadb_comb_hard_addtime = 24*60*60;
2900                         c->sadb_comb_soft_addtime = 20*60*60;
2901                         c->sadb_comb_hard_usetime = 8*60*60;
2902                         c->sadb_comb_soft_usetime = 7*60*60;
2903                 }
2904         }
2905 }
2906
2907 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2908 {
2909         struct sadb_prop *p;
2910         int i, k;
2911
2912         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2913         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2914         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2915         p->sadb_prop_replay = 32;
2916         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2917
2918         for (i=0; ; i++) {
2919                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920                 if (!ealg)
2921                         break;
2922
2923                 if (!ealg->pfkey_supported)
2924                         continue;
2925
2926                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927                         continue;
2928
2929                 for (k = 1; ; k++) {
2930                         struct sadb_comb *c;
2931                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2932                         if (!aalg)
2933                                 break;
2934                         if (!aalg->pfkey_supported)
2935                                 continue;
2936                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2937                                 continue;
2938                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2939                         memset(c, 0, sizeof(*c));
2940                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2941                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2942                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2943                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2944                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2945                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2946                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2947                         c->sadb_comb_hard_addtime = 24*60*60;
2948                         c->sadb_comb_soft_addtime = 20*60*60;
2949                         c->sadb_comb_hard_usetime = 8*60*60;
2950                         c->sadb_comb_soft_usetime = 7*60*60;
2951                 }
2952         }
2953 }
2954
2955 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2956 {
2957         return 0;
2958 }
2959
2960 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2961 {
2962         struct sk_buff *out_skb;
2963         struct sadb_msg *out_hdr;
2964         int hard;
2965         int hsc;
2966
2967         hard = c->data.hard;
2968         if (hard)
2969                 hsc = 2;
2970         else
2971                 hsc = 1;
2972
2973         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2974         if (IS_ERR(out_skb))
2975                 return PTR_ERR(out_skb);
2976
2977         out_hdr = (struct sadb_msg *) out_skb->data;
2978         out_hdr->sadb_msg_version = PF_KEY_V2;
2979         out_hdr->sadb_msg_type = SADB_EXPIRE;
2980         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2981         out_hdr->sadb_msg_errno = 0;
2982         out_hdr->sadb_msg_reserved = 0;
2983         out_hdr->sadb_msg_seq = 0;
2984         out_hdr->sadb_msg_pid = 0;
2985
2986         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2987         return 0;
2988 }
2989
2990 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2991 {
2992         struct net *net = x ? xs_net(x) : c->net;
2993         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2994
2995         if (atomic_read(&net_pfkey->socks_nr) == 0)
2996                 return 0;
2997
2998         switch (c->event) {
2999         case XFRM_MSG_EXPIRE:
3000                 return key_notify_sa_expire(x, c);
3001         case XFRM_MSG_DELSA:
3002         case XFRM_MSG_NEWSA:
3003         case XFRM_MSG_UPDSA:
3004                 return key_notify_sa(x, c);
3005         case XFRM_MSG_FLUSHSA:
3006                 return key_notify_sa_flush(c);
3007         case XFRM_MSG_NEWAE: /* not yet supported */
3008                 break;
3009         default:
3010                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3011                 break;
3012         }
3013
3014         return 0;
3015 }
3016
3017 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3018 {
3019         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3020                 return 0;
3021
3022         switch (c->event) {
3023         case XFRM_MSG_POLEXPIRE:
3024                 return key_notify_policy_expire(xp, c);
3025         case XFRM_MSG_DELPOLICY:
3026         case XFRM_MSG_NEWPOLICY:
3027         case XFRM_MSG_UPDPOLICY:
3028                 return key_notify_policy(xp, dir, c);
3029         case XFRM_MSG_FLUSHPOLICY:
3030                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3031                         break;
3032                 return key_notify_policy_flush(c);
3033         default:
3034                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3035                 break;
3036         }
3037
3038         return 0;
3039 }
3040
3041 static u32 get_acqseq(void)
3042 {
3043         u32 res;
3044         static atomic_t acqseq;
3045
3046         do {
3047                 res = atomic_inc_return(&acqseq);
3048         } while (!res);
3049         return res;
3050 }
3051
3052 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3053 {
3054         struct sk_buff *skb;
3055         struct sadb_msg *hdr;
3056         struct sadb_address *addr;
3057         struct sadb_x_policy *pol;
3058         int sockaddr_size;
3059         int size;
3060         struct sadb_x_sec_ctx *sec_ctx;
3061         struct xfrm_sec_ctx *xfrm_ctx;
3062         int ctx_size = 0;
3063
3064         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3065         if (!sockaddr_size)
3066                 return -EINVAL;
3067
3068         size = sizeof(struct sadb_msg) +
3069                 (sizeof(struct sadb_address) * 2) +
3070                 (sockaddr_size * 2) +
3071                 sizeof(struct sadb_x_policy);
3072
3073         if (x->id.proto == IPPROTO_AH)
3074                 size += count_ah_combs(t);
3075         else if (x->id.proto == IPPROTO_ESP)
3076                 size += count_esp_combs(t);
3077
3078         if ((xfrm_ctx = x->security)) {
3079                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3080                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3081         }
3082
3083         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3084         if (skb == NULL)
3085                 return -ENOMEM;
3086
3087         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3088         hdr->sadb_msg_version = PF_KEY_V2;
3089         hdr->sadb_msg_type = SADB_ACQUIRE;
3090         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3091         hdr->sadb_msg_len = size / sizeof(uint64_t);
3092         hdr->sadb_msg_errno = 0;
3093         hdr->sadb_msg_reserved = 0;
3094         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3095         hdr->sadb_msg_pid = 0;
3096
3097         /* src address */
3098         addr = (struct sadb_address*) skb_put(skb,
3099                                               sizeof(struct sadb_address)+sockaddr_size);
3100         addr->sadb_address_len =
3101                 (sizeof(struct sadb_address)+sockaddr_size)/
3102                         sizeof(uint64_t);
3103         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3104         addr->sadb_address_proto = 0;
3105         addr->sadb_address_reserved = 0;
3106         addr->sadb_address_prefixlen =
3107                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3108                                     (struct sockaddr *) (addr + 1),
3109                                     x->props.family);
3110         if (!addr->sadb_address_prefixlen)
3111                 BUG();
3112
3113         /* dst address */
3114         addr = (struct sadb_address*) skb_put(skb,
3115                                               sizeof(struct sadb_address)+sockaddr_size);
3116         addr->sadb_address_len =
3117                 (sizeof(struct sadb_address)+sockaddr_size)/
3118                         sizeof(uint64_t);
3119         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3120         addr->sadb_address_proto = 0;
3121         addr->sadb_address_reserved = 0;
3122         addr->sadb_address_prefixlen =
3123                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3124                                     (struct sockaddr *) (addr + 1),
3125                                     x->props.family);
3126         if (!addr->sadb_address_prefixlen)
3127                 BUG();
3128
3129         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3130         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3131         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3132         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3133         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3134         pol->sadb_x_policy_reserved = 0;
3135         pol->sadb_x_policy_id = xp->index;
3136         pol->sadb_x_policy_priority = xp->priority;
3137
3138         /* Set sadb_comb's. */
3139         if (x->id.proto == IPPROTO_AH)
3140                 dump_ah_combs(skb, t);
3141         else if (x->id.proto == IPPROTO_ESP)
3142                 dump_esp_combs(skb, t);
3143
3144         /* security context */
3145         if (xfrm_ctx) {
3146                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3147                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3148                 sec_ctx->sadb_x_sec_len =
3149                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3150                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3151                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3152                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3153                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3154                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3155                        xfrm_ctx->ctx_len);
3156         }
3157
3158         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3159 }
3160
3161 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3162                                                 u8 *data, int len, int *dir)
3163 {
3164         struct net *net = sock_net(sk);
3165         struct xfrm_policy *xp;
3166         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3167         struct sadb_x_sec_ctx *sec_ctx;
3168
3169         switch (sk->sk_family) {
3170         case AF_INET:
3171                 if (opt != IP_IPSEC_POLICY) {
3172                         *dir = -EOPNOTSUPP;
3173                         return NULL;
3174                 }
3175                 break;
3176 #if IS_ENABLED(CONFIG_IPV6)
3177         case AF_INET6:
3178                 if (opt != IPV6_IPSEC_POLICY) {
3179                         *dir = -EOPNOTSUPP;
3180                         return NULL;
3181                 }
3182                 break;
3183 #endif
3184         default:
3185                 *dir = -EINVAL;
3186                 return NULL;
3187         }
3188
3189         *dir = -EINVAL;
3190
3191         if (len < sizeof(struct sadb_x_policy) ||
3192             pol->sadb_x_policy_len*8 > len ||
3193             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3194             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3195                 return NULL;
3196
3197         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3198         if (xp == NULL) {
3199                 *dir = -ENOBUFS;
3200                 return NULL;
3201         }
3202
3203         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3204                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3205
3206         xp->lft.soft_byte_limit = XFRM_INF;
3207         xp->lft.hard_byte_limit = XFRM_INF;
3208         xp->lft.soft_packet_limit = XFRM_INF;
3209         xp->lft.hard_packet_limit = XFRM_INF;
3210         xp->family = sk->sk_family;
3211
3212         xp->xfrm_nr = 0;
3213         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3214             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3215                 goto out;
3216
3217         /* security context too */
3218         if (len >= (pol->sadb_x_policy_len*8 +
3219             sizeof(struct sadb_x_sec_ctx))) {
3220                 char *p = (char *)pol;
3221                 struct xfrm_user_sec_ctx *uctx;
3222
3223                 p += pol->sadb_x_policy_len*8;
3224                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3225                 if (len < pol->sadb_x_policy_len*8 +
3226                     sec_ctx->sadb_x_sec_len) {
3227                         *dir = -EINVAL;
3228                         goto out;
3229                 }
3230                 if ((*dir = verify_sec_ctx_len(p)))
3231                         goto out;
3232                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3233                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3234                 kfree(uctx);
3235
3236                 if (*dir)
3237                         goto out;
3238         }
3239
3240         *dir = pol->sadb_x_policy_dir-1;
3241         return xp;
3242
3243 out:
3244         xp->walk.dead = 1;
3245         xfrm_policy_destroy(xp);
3246         return NULL;
3247 }
3248
3249 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3250 {
3251         struct sk_buff *skb;
3252         struct sadb_msg *hdr;
3253         struct sadb_sa *sa;
3254         struct sadb_address *addr;
3255         struct sadb_x_nat_t_port *n_port;
3256         int sockaddr_size;
3257         int size;
3258         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3259         struct xfrm_encap_tmpl *natt = NULL;
3260
3261         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3262         if (!sockaddr_size)
3263                 return -EINVAL;
3264
3265         if (!satype)
3266                 return -EINVAL;
3267
3268         if (!x->encap)
3269                 return -EINVAL;
3270
3271         natt = x->encap;
3272
3273         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3274          *
3275          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3276          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3277          */
3278
3279         size = sizeof(struct sadb_msg) +
3280                 sizeof(struct sadb_sa) +
3281                 (sizeof(struct sadb_address) * 2) +
3282                 (sockaddr_size * 2) +
3283                 (sizeof(struct sadb_x_nat_t_port) * 2);
3284
3285         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3286         if (skb == NULL)
3287                 return -ENOMEM;
3288
3289         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3290         hdr->sadb_msg_version = PF_KEY_V2;
3291         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3292         hdr->sadb_msg_satype = satype;
3293         hdr->sadb_msg_len = size / sizeof(uint64_t);
3294         hdr->sadb_msg_errno = 0;
3295         hdr->sadb_msg_reserved = 0;
3296         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3297         hdr->sadb_msg_pid = 0;
3298
3299         /* SA */
3300         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3301         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3302         sa->sadb_sa_exttype = SADB_EXT_SA;
3303         sa->sadb_sa_spi = x->id.spi;
3304         sa->sadb_sa_replay = 0;
3305         sa->sadb_sa_state = 0;
3306         sa->sadb_sa_auth = 0;
3307         sa->sadb_sa_encrypt = 0;
3308         sa->sadb_sa_flags = 0;
3309
3310         /* ADDRESS_SRC (old addr) */
3311         addr = (struct sadb_address*)
3312                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3313         addr->sadb_address_len =
3314                 (sizeof(struct sadb_address)+sockaddr_size)/
3315                         sizeof(uint64_t);
3316         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3317         addr->sadb_address_proto = 0;
3318         addr->sadb_address_reserved = 0;
3319         addr->sadb_address_prefixlen =
3320                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3321                                     (struct sockaddr *) (addr + 1),
3322                                     x->props.family);
3323         if (!addr->sadb_address_prefixlen)
3324                 BUG();
3325
3326         /* NAT_T_SPORT (old port) */
3327         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3328         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3329         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3330         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3331         n_port->sadb_x_nat_t_port_reserved = 0;
3332
3333         /* ADDRESS_DST (new addr) */
3334         addr = (struct sadb_address*)
3335                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3336         addr->sadb_address_len =
3337                 (sizeof(struct sadb_address)+sockaddr_size)/
3338                         sizeof(uint64_t);
3339         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3340         addr->sadb_address_proto = 0;
3341         addr->sadb_address_reserved = 0;
3342         addr->sadb_address_prefixlen =
3343                 pfkey_sockaddr_fill(ipaddr, 0,
3344                                     (struct sockaddr *) (addr + 1),
3345                                     x->props.family);
3346         if (!addr->sadb_address_prefixlen)
3347                 BUG();
3348
3349         /* NAT_T_DPORT (new port) */
3350         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3351         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3352         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3353         n_port->sadb_x_nat_t_port_port = sport;
3354         n_port->sadb_x_nat_t_port_reserved = 0;
3355
3356         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3357 }
3358
3359 #ifdef CONFIG_NET_KEY_MIGRATE
3360 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3361                             const struct xfrm_selector *sel)
3362 {
3363         struct sadb_address *addr;
3364         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3365         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3366         addr->sadb_address_exttype = type;
3367         addr->sadb_address_proto = sel->proto;
3368         addr->sadb_address_reserved = 0;
3369
3370         switch (type) {
3371         case SADB_EXT_ADDRESS_SRC:
3372                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3373                 pfkey_sockaddr_fill(&sel->saddr, 0,
3374                                     (struct sockaddr *)(addr + 1),
3375                                     sel->family);
3376                 break;
3377         case SADB_EXT_ADDRESS_DST:
3378                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3379                 pfkey_sockaddr_fill(&sel->daddr, 0,
3380                                     (struct sockaddr *)(addr + 1),
3381                                     sel->family);
3382                 break;
3383         default:
3384                 return -EINVAL;
3385         }
3386
3387         return 0;
3388 }
3389
3390
3391 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3392 {
3393         struct sadb_x_kmaddress *kma;
3394         u8 *sa;
3395         int family = k->family;
3396         int socklen = pfkey_sockaddr_len(family);
3397         int size_req;
3398
3399         size_req = (sizeof(struct sadb_x_kmaddress) +
3400                     pfkey_sockaddr_pair_size(family));
3401
3402         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3403         memset(kma, 0, size_req);
3404         kma->sadb_x_kmaddress_len = size_req / 8;
3405         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3406         kma->sadb_x_kmaddress_reserved = k->reserved;
3407
3408         sa = (u8 *)(kma + 1);
3409         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3410             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3411                 return -EINVAL;
3412
3413         return 0;
3414 }
3415
3416 static int set_ipsecrequest(struct sk_buff *skb,
3417                             uint8_t proto, uint8_t mode, int level,
3418                             uint32_t reqid, uint8_t family,
3419                             const xfrm_address_t *src, const xfrm_address_t *dst)
3420 {
3421         struct sadb_x_ipsecrequest *rq;
3422         u8 *sa;
3423         int socklen = pfkey_sockaddr_len(family);
3424         int size_req;
3425
3426         size_req = sizeof(struct sadb_x_ipsecrequest) +
3427                    pfkey_sockaddr_pair_size(family);
3428
3429         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3430         memset(rq, 0, size_req);
3431         rq->sadb_x_ipsecrequest_len = size_req;
3432         rq->sadb_x_ipsecrequest_proto = proto;
3433         rq->sadb_x_ipsecrequest_mode = mode;
3434         rq->sadb_x_ipsecrequest_level = level;
3435         rq->sadb_x_ipsecrequest_reqid = reqid;
3436
3437         sa = (u8 *) (rq + 1);
3438         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3439             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3440                 return -EINVAL;
3441
3442         return 0;
3443 }
3444 #endif
3445
3446 #ifdef CONFIG_NET_KEY_MIGRATE
3447 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3448                               const struct xfrm_migrate *m, int num_bundles,
3449                               const struct xfrm_kmaddress *k)
3450 {
3451         int i;
3452         int sasize_sel;
3453         int size = 0;
3454         int size_pol = 0;
3455         struct sk_buff *skb;
3456         struct sadb_msg *hdr;
3457         struct sadb_x_policy *pol;
3458         const struct xfrm_migrate *mp;
3459
3460         if (type != XFRM_POLICY_TYPE_MAIN)
3461                 return 0;
3462
3463         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3464                 return -EINVAL;
3465
3466         if (k != NULL) {
3467                 /* addresses for KM */
3468                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3469                                      pfkey_sockaddr_pair_size(k->family));
3470         }
3471
3472         /* selector */
3473         sasize_sel = pfkey_sockaddr_size(sel->family);
3474         if (!sasize_sel)
3475                 return -EINVAL;
3476         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3477
3478         /* policy info */
3479         size_pol += sizeof(struct sadb_x_policy);
3480
3481         /* ipsecrequests */
3482         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3483                 /* old locator pair */
3484                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3485                             pfkey_sockaddr_pair_size(mp->old_family);
3486                 /* new locator pair */
3487                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3488                             pfkey_sockaddr_pair_size(mp->new_family);
3489         }
3490
3491         size += sizeof(struct sadb_msg) + size_pol;
3492
3493         /* alloc buffer */
3494         skb = alloc_skb(size, GFP_ATOMIC);
3495         if (skb == NULL)
3496                 return -ENOMEM;
3497
3498         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3499         hdr->sadb_msg_version = PF_KEY_V2;
3500         hdr->sadb_msg_type = SADB_X_MIGRATE;
3501         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3502         hdr->sadb_msg_len = size / 8;
3503         hdr->sadb_msg_errno = 0;
3504         hdr->sadb_msg_reserved = 0;
3505         hdr->sadb_msg_seq = 0;
3506         hdr->sadb_msg_pid = 0;
3507
3508         /* Addresses to be used by KM for negotiation, if ext is available */
3509         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3510                 goto err;
3511
3512         /* selector src */
3513         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3514
3515         /* selector dst */
3516         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3517
3518         /* policy information */
3519         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3520         pol->sadb_x_policy_len = size_pol / 8;
3521         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3522         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3523         pol->sadb_x_policy_dir = dir + 1;
3524         pol->sadb_x_policy_reserved = 0;
3525         pol->sadb_x_policy_id = 0;
3526         pol->sadb_x_policy_priority = 0;
3527
3528         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3529                 /* old ipsecrequest */
3530                 int mode = pfkey_mode_from_xfrm(mp->mode);
3531                 if (mode < 0)
3532                         goto err;
3533                 if (set_ipsecrequest(skb, mp->proto, mode,
3534                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3535                                      mp->reqid, mp->old_family,
3536                                      &mp->old_saddr, &mp->old_daddr) < 0)
3537                         goto err;
3538
3539                 /* new ipsecrequest */
3540                 if (set_ipsecrequest(skb, mp->proto, mode,
3541                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3542                                      mp->reqid, mp->new_family,
3543                                      &mp->new_saddr, &mp->new_daddr) < 0)
3544                         goto err;
3545         }
3546
3547         /* broadcast migrate message to sockets */
3548         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3549
3550         return 0;
3551
3552 err:
3553         kfree_skb(skb);
3554         return -EINVAL;
3555 }
3556 #else
3557 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3558                               const struct xfrm_migrate *m, int num_bundles,
3559                               const struct xfrm_kmaddress *k)
3560 {
3561         return -ENOPROTOOPT;
3562 }
3563 #endif
3564
3565 static int pfkey_sendmsg(struct kiocb *kiocb,
3566                          struct socket *sock, struct msghdr *msg, size_t len)
3567 {
3568         struct sock *sk = sock->sk;
3569         struct sk_buff *skb = NULL;
3570         struct sadb_msg *hdr = NULL;
3571         int err;
3572
3573         err = -EOPNOTSUPP;
3574         if (msg->msg_flags & MSG_OOB)
3575                 goto out;
3576
3577         err = -EMSGSIZE;
3578         if ((unsigned int)len > sk->sk_sndbuf - 32)
3579                 goto out;
3580
3581         err = -ENOBUFS;
3582         skb = alloc_skb(len, GFP_KERNEL);
3583         if (skb == NULL)
3584                 goto out;
3585
3586         err = -EFAULT;
3587         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3588                 goto out;
3589
3590         hdr = pfkey_get_base_msg(skb, &err);
3591         if (!hdr)
3592                 goto out;
3593
3594         mutex_lock(&xfrm_cfg_mutex);
3595         err = pfkey_process(sk, skb, hdr);
3596         mutex_unlock(&xfrm_cfg_mutex);
3597
3598 out:
3599         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3600                 err = 0;
3601         kfree_skb(skb);
3602
3603         return err ? : len;
3604 }
3605
3606 static int pfkey_recvmsg(struct kiocb *kiocb,
3607                          struct socket *sock, struct msghdr *msg, size_t len,
3608                          int flags)
3609 {
3610         struct sock *sk = sock->sk;
3611         struct pfkey_sock *pfk = pfkey_sk(sk);
3612         struct sk_buff *skb;
3613         int copied, err;
3614
3615         err = -EINVAL;
3616         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3617                 goto out;
3618
3619         msg->msg_namelen = 0;
3620         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3621         if (skb == NULL)
3622                 goto out;
3623
3624         copied = skb->len;
3625         if (copied > len) {
3626                 msg->msg_flags |= MSG_TRUNC;
3627                 copied = len;
3628         }
3629
3630         skb_reset_transport_header(skb);
3631         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3632         if (err)
3633                 goto out_free;
3634
3635         sock_recv_ts_and_drops(msg, sk, skb);
3636
3637         err = (flags & MSG_TRUNC) ? skb->len : copied;
3638
3639         if (pfk->dump.dump != NULL &&
3640             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3641                 pfkey_do_dump(pfk);
3642
3643 out_free:
3644         skb_free_datagram(sk, skb);
3645 out:
3646         return err;
3647 }
3648
3649 static const struct proto_ops pfkey_ops = {
3650         .family         =       PF_KEY,
3651         .owner          =       THIS_MODULE,
3652         /* Operations that make no sense on pfkey sockets. */
3653         .bind           =       sock_no_bind,
3654         .connect        =       sock_no_connect,
3655         .socketpair     =       sock_no_socketpair,
3656         .accept         =       sock_no_accept,
3657         .getname        =       sock_no_getname,
3658         .ioctl          =       sock_no_ioctl,
3659         .listen         =       sock_no_listen,
3660         .shutdown       =       sock_no_shutdown,
3661         .setsockopt     =       sock_no_setsockopt,
3662         .getsockopt     =       sock_no_getsockopt,
3663         .mmap           =       sock_no_mmap,
3664         .sendpage       =       sock_no_sendpage,
3665
3666         /* Now the operations that really occur. */
3667         .release        =       pfkey_release,
3668         .poll           =       datagram_poll,
3669         .sendmsg        =       pfkey_sendmsg,
3670         .recvmsg        =       pfkey_recvmsg,
3671 };
3672
3673 static const struct net_proto_family pfkey_family_ops = {
3674         .family =       PF_KEY,
3675         .create =       pfkey_create,
3676         .owner  =       THIS_MODULE,
3677 };
3678
3679 #ifdef CONFIG_PROC_FS
3680 static int pfkey_seq_show(struct seq_file *f, void *v)
3681 {
3682         struct sock *s = sk_entry(v);
3683
3684         if (v == SEQ_START_TOKEN)
3685                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3686         else
3687                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3688                                s,
3689                                atomic_read(&s->sk_refcnt),
3690                                sk_rmem_alloc_get(s),
3691                                sk_wmem_alloc_get(s),
3692                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3693                                sock_i_ino(s)
3694                                );
3695         return 0;
3696 }
3697
3698 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3699         __acquires(rcu)
3700 {
3701         struct net *net = seq_file_net(f);
3702         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3703
3704         rcu_read_lock();
3705         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3706 }
3707
3708 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3709 {
3710         struct net *net = seq_file_net(f);
3711         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3712
3713         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3714 }
3715
3716 static void pfkey_seq_stop(struct seq_file *f, void *v)
3717         __releases(rcu)
3718 {
3719         rcu_read_unlock();
3720 }
3721
3722 static const struct seq_operations pfkey_seq_ops = {
3723         .start  = pfkey_seq_start,
3724         .next   = pfkey_seq_next,
3725         .stop   = pfkey_seq_stop,
3726         .show   = pfkey_seq_show,
3727 };
3728
3729 static int pfkey_seq_open(struct inode *inode, struct file *file)
3730 {
3731         return seq_open_net(inode, file, &pfkey_seq_ops,
3732                             sizeof(struct seq_net_private));
3733 }
3734
3735 static const struct file_operations pfkey_proc_ops = {
3736         .open    = pfkey_seq_open,
3737         .read    = seq_read,
3738         .llseek  = seq_lseek,
3739         .release = seq_release_net,
3740 };
3741
3742 static int __net_init pfkey_init_proc(struct net *net)
3743 {
3744         struct proc_dir_entry *e;
3745
3746         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3747         if (e == NULL)
3748                 return -ENOMEM;
3749
3750         return 0;
3751 }
3752
3753 static void __net_exit pfkey_exit_proc(struct net *net)
3754 {
3755         remove_proc_entry("pfkey", net->proc_net);
3756 }
3757 #else
3758 static inline int pfkey_init_proc(struct net *net)
3759 {
3760         return 0;
3761 }
3762
3763 static inline void pfkey_exit_proc(struct net *net)
3764 {
3765 }
3766 #endif
3767
3768 static struct xfrm_mgr pfkeyv2_mgr =
3769 {
3770         .id             = "pfkeyv2",
3771         .notify         = pfkey_send_notify,
3772         .acquire        = pfkey_send_acquire,
3773         .compile_policy = pfkey_compile_policy,
3774         .new_mapping    = pfkey_send_new_mapping,
3775         .notify_policy  = pfkey_send_policy_notify,
3776         .migrate        = pfkey_send_migrate,
3777 };
3778
3779 static int __net_init pfkey_net_init(struct net *net)
3780 {
3781         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3782         int rv;
3783
3784         INIT_HLIST_HEAD(&net_pfkey->table);
3785         atomic_set(&net_pfkey->socks_nr, 0);
3786
3787         rv = pfkey_init_proc(net);
3788
3789         return rv;
3790 }
3791
3792 static void __net_exit pfkey_net_exit(struct net *net)
3793 {
3794         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3795
3796         pfkey_exit_proc(net);
3797         BUG_ON(!hlist_empty(&net_pfkey->table));
3798 }
3799
3800 static struct pernet_operations pfkey_net_ops = {
3801         .init = pfkey_net_init,
3802         .exit = pfkey_net_exit,
3803         .id   = &pfkey_net_id,
3804         .size = sizeof(struct netns_pfkey),
3805 };
3806
3807 static void __exit ipsec_pfkey_exit(void)
3808 {
3809         xfrm_unregister_km(&pfkeyv2_mgr);
3810         sock_unregister(PF_KEY);
3811         unregister_pernet_subsys(&pfkey_net_ops);
3812         proto_unregister(&key_proto);
3813 }
3814
3815 static int __init ipsec_pfkey_init(void)
3816 {
3817         int err = proto_register(&key_proto, 0);
3818
3819         if (err != 0)
3820                 goto out;
3821
3822         err = register_pernet_subsys(&pfkey_net_ops);
3823         if (err != 0)
3824                 goto out_unregister_key_proto;
3825         err = sock_register(&pfkey_family_ops);
3826         if (err != 0)
3827                 goto out_unregister_pernet;
3828         err = xfrm_register_km(&pfkeyv2_mgr);
3829         if (err != 0)
3830                 goto out_sock_unregister;
3831 out:
3832         return err;
3833
3834 out_sock_unregister:
3835         sock_unregister(PF_KEY);
3836 out_unregister_pernet:
3837         unregister_pernet_subsys(&pfkey_net_ops);
3838 out_unregister_key_proto:
3839         proto_unregister(&key_proto);
3840         goto out;
3841 }
3842
3843 module_init(ipsec_pfkey_init);
3844 module_exit(ipsec_pfkey_exit);
3845 MODULE_LICENSE("GPL");
3846 MODULE_ALIAS_NETPROTO(PF_KEY);