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 = sa->sadb_sa_replay;
1102         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103                 x->props.flags |= XFRM_STATE_NOECN;
1104         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110         if (lifetime != NULL) {
1111                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115         }
1116         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117         if (lifetime != NULL) {
1118                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122         }
1123
1124         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125         if (sec_ctx != NULL) {
1126                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1127
1128                 if (!uctx)
1129                         goto out;
1130
1131                 err = security_xfrm_state_alloc(x, uctx);
1132                 kfree(uctx);
1133
1134                 if (err)
1135                         goto out;
1136         }
1137
1138         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139         if (sa->sadb_sa_auth) {
1140                 int keysize = 0;
1141                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142                 if (!a || !a->pfkey_supported) {
1143                         err = -ENOSYS;
1144                         goto out;
1145                 }
1146                 if (key)
1147                         keysize = (key->sadb_key_bits + 7) / 8;
1148                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149                 if (!x->aalg)
1150                         goto out;
1151                 strcpy(x->aalg->alg_name, a->name);
1152                 x->aalg->alg_key_len = 0;
1153                 if (key) {
1154                         x->aalg->alg_key_len = key->sadb_key_bits;
1155                         memcpy(x->aalg->alg_key, key+1, keysize);
1156                 }
1157                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158                 x->props.aalgo = sa->sadb_sa_auth;
1159                 /* x->algo.flags = sa->sadb_sa_flags; */
1160         }
1161         if (sa->sadb_sa_encrypt) {
1162                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164                         if (!a || !a->pfkey_supported) {
1165                                 err = -ENOSYS;
1166                                 goto out;
1167                         }
1168                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169                         if (!x->calg)
1170                                 goto out;
1171                         strcpy(x->calg->alg_name, a->name);
1172                         x->props.calgo = sa->sadb_sa_encrypt;
1173                 } else {
1174                         int keysize = 0;
1175                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176                         if (!a || !a->pfkey_supported) {
1177                                 err = -ENOSYS;
1178                                 goto out;
1179                         }
1180                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181                         if (key)
1182                                 keysize = (key->sadb_key_bits + 7) / 8;
1183                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184                         if (!x->ealg)
1185                                 goto out;
1186                         strcpy(x->ealg->alg_name, a->name);
1187                         x->ealg->alg_key_len = 0;
1188                         if (key) {
1189                                 x->ealg->alg_key_len = key->sadb_key_bits;
1190                                 memcpy(x->ealg->alg_key, key+1, keysize);
1191                         }
1192                         x->props.ealgo = sa->sadb_sa_encrypt;
1193                 }
1194         }
1195         /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198                                                     &x->props.saddr);
1199         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1200                                   &x->id.daddr);
1201
1202         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1203                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1204                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1205                 if (mode < 0) {
1206                         err = -EINVAL;
1207                         goto out;
1208                 }
1209                 x->props.mode = mode;
1210                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1211         }
1212
1213         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1214                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1215
1216                 /* Nobody uses this, but we try. */
1217                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1218                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1219         }
1220
1221         if (!x->sel.family)
1222                 x->sel.family = x->props.family;
1223
1224         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1225                 const struct sadb_x_nat_t_type* n_type;
1226                 struct xfrm_encap_tmpl *natt;
1227
1228                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1229                 if (!x->encap)
1230                         goto out;
1231
1232                 natt = x->encap;
1233                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1234                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1235
1236                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1237                         const struct sadb_x_nat_t_port *n_port =
1238                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1239                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1240                 }
1241                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1242                         const struct sadb_x_nat_t_port *n_port =
1243                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1244                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1245                 }
1246                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1247         }
1248
1249         err = xfrm_init_state(x);
1250         if (err)
1251                 goto out;
1252
1253         x->km.seq = hdr->sadb_msg_seq;
1254         return x;
1255
1256 out:
1257         x->km.state = XFRM_STATE_DEAD;
1258         xfrm_state_put(x);
1259         return ERR_PTR(err);
1260 }
1261
1262 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1263 {
1264         return -EOPNOTSUPP;
1265 }
1266
1267 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1268 {
1269         struct net *net = sock_net(sk);
1270         struct sk_buff *resp_skb;
1271         struct sadb_x_sa2 *sa2;
1272         struct sadb_address *saddr, *daddr;
1273         struct sadb_msg *out_hdr;
1274         struct sadb_spirange *range;
1275         struct xfrm_state *x = NULL;
1276         int mode;
1277         int err;
1278         u32 min_spi, max_spi;
1279         u32 reqid;
1280         u8 proto;
1281         unsigned short family;
1282         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1283
1284         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1285                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1286                 return -EINVAL;
1287
1288         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1289         if (proto == 0)
1290                 return -EINVAL;
1291
1292         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1293                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1294                 if (mode < 0)
1295                         return -EINVAL;
1296                 reqid = sa2->sadb_x_sa2_reqid;
1297         } else {
1298                 mode = 0;
1299                 reqid = 0;
1300         }
1301
1302         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1303         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1304
1305         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1306         switch (family) {
1307         case AF_INET:
1308                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1309                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1310                 break;
1311 #if IS_ENABLED(CONFIG_IPV6)
1312         case AF_INET6:
1313                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1314                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1315                 break;
1316 #endif
1317         }
1318
1319         if (hdr->sadb_msg_seq) {
1320                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1321                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1322                         xfrm_state_put(x);
1323                         x = NULL;
1324                 }
1325         }
1326
1327         if (!x)
1328                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1329
1330         if (x == NULL)
1331                 return -ENOENT;
1332
1333         min_spi = 0x100;
1334         max_spi = 0x0fffffff;
1335
1336         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1337         if (range) {
1338                 min_spi = range->sadb_spirange_min;
1339                 max_spi = range->sadb_spirange_max;
1340         }
1341
1342         err = xfrm_alloc_spi(x, min_spi, max_spi);
1343         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1344
1345         if (IS_ERR(resp_skb)) {
1346                 xfrm_state_put(x);
1347                 return  PTR_ERR(resp_skb);
1348         }
1349
1350         out_hdr = (struct sadb_msg *) resp_skb->data;
1351         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1352         out_hdr->sadb_msg_type = SADB_GETSPI;
1353         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1354         out_hdr->sadb_msg_errno = 0;
1355         out_hdr->sadb_msg_reserved = 0;
1356         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1357         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1358
1359         xfrm_state_put(x);
1360
1361         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1362
1363         return 0;
1364 }
1365
1366 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1367 {
1368         struct net *net = sock_net(sk);
1369         struct xfrm_state *x;
1370
1371         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1372                 return -EOPNOTSUPP;
1373
1374         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1375                 return 0;
1376
1377         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1378         if (x == NULL)
1379                 return 0;
1380
1381         spin_lock_bh(&x->lock);
1382         if (x->km.state == XFRM_STATE_ACQ) {
1383                 x->km.state = XFRM_STATE_ERROR;
1384                 wake_up(&net->xfrm.km_waitq);
1385         }
1386         spin_unlock_bh(&x->lock);
1387         xfrm_state_put(x);
1388         return 0;
1389 }
1390
1391 static inline int event2poltype(int event)
1392 {
1393         switch (event) {
1394         case XFRM_MSG_DELPOLICY:
1395                 return SADB_X_SPDDELETE;
1396         case XFRM_MSG_NEWPOLICY:
1397                 return SADB_X_SPDADD;
1398         case XFRM_MSG_UPDPOLICY:
1399                 return SADB_X_SPDUPDATE;
1400         case XFRM_MSG_POLEXPIRE:
1401         //      return SADB_X_SPDEXPIRE;
1402         default:
1403                 pr_err("pfkey: Unknown policy event %d\n", event);
1404                 break;
1405         }
1406
1407         return 0;
1408 }
1409
1410 static inline int event2keytype(int event)
1411 {
1412         switch (event) {
1413         case XFRM_MSG_DELSA:
1414                 return SADB_DELETE;
1415         case XFRM_MSG_NEWSA:
1416                 return SADB_ADD;
1417         case XFRM_MSG_UPDSA:
1418                 return SADB_UPDATE;
1419         case XFRM_MSG_EXPIRE:
1420                 return SADB_EXPIRE;
1421         default:
1422                 pr_err("pfkey: Unknown SA event %d\n", event);
1423                 break;
1424         }
1425
1426         return 0;
1427 }
1428
1429 /* ADD/UPD/DEL */
1430 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1431 {
1432         struct sk_buff *skb;
1433         struct sadb_msg *hdr;
1434
1435         skb = pfkey_xfrm_state2msg(x);
1436
1437         if (IS_ERR(skb))
1438                 return PTR_ERR(skb);
1439
1440         hdr = (struct sadb_msg *) skb->data;
1441         hdr->sadb_msg_version = PF_KEY_V2;
1442         hdr->sadb_msg_type = event2keytype(c->event);
1443         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1444         hdr->sadb_msg_errno = 0;
1445         hdr->sadb_msg_reserved = 0;
1446         hdr->sadb_msg_seq = c->seq;
1447         hdr->sadb_msg_pid = c->portid;
1448
1449         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1450
1451         return 0;
1452 }
1453
1454 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1455 {
1456         struct net *net = sock_net(sk);
1457         struct xfrm_state *x;
1458         int err;
1459         struct km_event c;
1460
1461         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1462         if (IS_ERR(x))
1463                 return PTR_ERR(x);
1464
1465         xfrm_state_hold(x);
1466         if (hdr->sadb_msg_type == SADB_ADD)
1467                 err = xfrm_state_add(x);
1468         else
1469                 err = xfrm_state_update(x);
1470
1471         xfrm_audit_state_add(x, err ? 0 : 1,
1472                              audit_get_loginuid(current),
1473                              audit_get_sessionid(current), 0);
1474
1475         if (err < 0) {
1476                 x->km.state = XFRM_STATE_DEAD;
1477                 __xfrm_state_put(x);
1478                 goto out;
1479         }
1480
1481         if (hdr->sadb_msg_type == SADB_ADD)
1482                 c.event = XFRM_MSG_NEWSA;
1483         else
1484                 c.event = XFRM_MSG_UPDSA;
1485         c.seq = hdr->sadb_msg_seq;
1486         c.portid = hdr->sadb_msg_pid;
1487         km_state_notify(x, &c);
1488 out:
1489         xfrm_state_put(x);
1490         return err;
1491 }
1492
1493 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1494 {
1495         struct net *net = sock_net(sk);
1496         struct xfrm_state *x;
1497         struct km_event c;
1498         int err;
1499
1500         if (!ext_hdrs[SADB_EXT_SA-1] ||
1501             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1502                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1503                 return -EINVAL;
1504
1505         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1506         if (x == NULL)
1507                 return -ESRCH;
1508
1509         if ((err = security_xfrm_state_delete(x)))
1510                 goto out;
1511
1512         if (xfrm_state_kern(x)) {
1513                 err = -EPERM;
1514                 goto out;
1515         }
1516
1517         err = xfrm_state_delete(x);
1518
1519         if (err < 0)
1520                 goto out;
1521
1522         c.seq = hdr->sadb_msg_seq;
1523         c.portid = hdr->sadb_msg_pid;
1524         c.event = XFRM_MSG_DELSA;
1525         km_state_notify(x, &c);
1526 out:
1527         xfrm_audit_state_delete(x, err ? 0 : 1,
1528                                 audit_get_loginuid(current),
1529                                 audit_get_sessionid(current), 0);
1530         xfrm_state_put(x);
1531
1532         return err;
1533 }
1534
1535 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1536 {
1537         struct net *net = sock_net(sk);
1538         __u8 proto;
1539         struct sk_buff *out_skb;
1540         struct sadb_msg *out_hdr;
1541         struct xfrm_state *x;
1542
1543         if (!ext_hdrs[SADB_EXT_SA-1] ||
1544             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1545                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1546                 return -EINVAL;
1547
1548         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1549         if (x == NULL)
1550                 return -ESRCH;
1551
1552         out_skb = pfkey_xfrm_state2msg(x);
1553         proto = x->id.proto;
1554         xfrm_state_put(x);
1555         if (IS_ERR(out_skb))
1556                 return  PTR_ERR(out_skb);
1557
1558         out_hdr = (struct sadb_msg *) out_skb->data;
1559         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1560         out_hdr->sadb_msg_type = SADB_GET;
1561         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1562         out_hdr->sadb_msg_errno = 0;
1563         out_hdr->sadb_msg_reserved = 0;
1564         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1565         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1566         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1567
1568         return 0;
1569 }
1570
1571 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1572                                               gfp_t allocation)
1573 {
1574         struct sk_buff *skb;
1575         struct sadb_msg *hdr;
1576         int len, auth_len, enc_len, i;
1577
1578         auth_len = xfrm_count_pfkey_auth_supported();
1579         if (auth_len) {
1580                 auth_len *= sizeof(struct sadb_alg);
1581                 auth_len += sizeof(struct sadb_supported);
1582         }
1583
1584         enc_len = xfrm_count_pfkey_enc_supported();
1585         if (enc_len) {
1586                 enc_len *= sizeof(struct sadb_alg);
1587                 enc_len += sizeof(struct sadb_supported);
1588         }
1589
1590         len = enc_len + auth_len + sizeof(struct sadb_msg);
1591
1592         skb = alloc_skb(len + 16, allocation);
1593         if (!skb)
1594                 goto out_put_algs;
1595
1596         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1597         pfkey_hdr_dup(hdr, orig);
1598         hdr->sadb_msg_errno = 0;
1599         hdr->sadb_msg_len = len / sizeof(uint64_t);
1600
1601         if (auth_len) {
1602                 struct sadb_supported *sp;
1603                 struct sadb_alg *ap;
1604
1605                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1606                 ap = (struct sadb_alg *) (sp + 1);
1607
1608                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1609                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1610
1611                 for (i = 0; ; i++) {
1612                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1613                         if (!aalg)
1614                                 break;
1615                         if (!aalg->pfkey_supported)
1616                                 continue;
1617                         if (aalg->available)
1618                                 *ap++ = aalg->desc;
1619                 }
1620         }
1621
1622         if (enc_len) {
1623                 struct sadb_supported *sp;
1624                 struct sadb_alg *ap;
1625
1626                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1627                 ap = (struct sadb_alg *) (sp + 1);
1628
1629                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1630                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1631
1632                 for (i = 0; ; i++) {
1633                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1634                         if (!ealg)
1635                                 break;
1636                         if (!ealg->pfkey_supported)
1637                                 continue;
1638                         if (ealg->available)
1639                                 *ap++ = ealg->desc;
1640                 }
1641         }
1642
1643 out_put_algs:
1644         return skb;
1645 }
1646
1647 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1648 {
1649         struct pfkey_sock *pfk = pfkey_sk(sk);
1650         struct sk_buff *supp_skb;
1651
1652         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1653                 return -EINVAL;
1654
1655         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1656                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1657                         return -EEXIST;
1658                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1659         }
1660
1661         xfrm_probe_algs();
1662
1663         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1664         if (!supp_skb) {
1665                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1666                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1667
1668                 return -ENOBUFS;
1669         }
1670
1671         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1672
1673         return 0;
1674 }
1675
1676 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1677 {
1678         struct sk_buff *skb;
1679         struct sadb_msg *hdr;
1680
1681         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1682         if (!skb)
1683                 return -ENOBUFS;
1684
1685         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1686         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1687         hdr->sadb_msg_errno = (uint8_t) 0;
1688         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1689
1690         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1691 }
1692
1693 static int key_notify_sa_flush(const struct km_event *c)
1694 {
1695         struct sk_buff *skb;
1696         struct sadb_msg *hdr;
1697
1698         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1699         if (!skb)
1700                 return -ENOBUFS;
1701         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1702         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1703         hdr->sadb_msg_type = SADB_FLUSH;
1704         hdr->sadb_msg_seq = c->seq;
1705         hdr->sadb_msg_pid = c->portid;
1706         hdr->sadb_msg_version = PF_KEY_V2;
1707         hdr->sadb_msg_errno = (uint8_t) 0;
1708         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1709         hdr->sadb_msg_reserved = 0;
1710
1711         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1712
1713         return 0;
1714 }
1715
1716 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1717 {
1718         struct net *net = sock_net(sk);
1719         unsigned int proto;
1720         struct km_event c;
1721         struct xfrm_audit audit_info;
1722         int err, err2;
1723
1724         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1725         if (proto == 0)
1726                 return -EINVAL;
1727
1728         audit_info.loginuid = audit_get_loginuid(current);
1729         audit_info.sessionid = audit_get_sessionid(current);
1730         audit_info.secid = 0;
1731         err = xfrm_state_flush(net, proto, &audit_info);
1732         err2 = unicast_flush_resp(sk, hdr);
1733         if (err || err2) {
1734                 if (err == -ESRCH) /* empty table - go quietly */
1735                         err = 0;
1736                 return err ? err : err2;
1737         }
1738
1739         c.data.proto = proto;
1740         c.seq = hdr->sadb_msg_seq;
1741         c.portid = hdr->sadb_msg_pid;
1742         c.event = XFRM_MSG_FLUSHSA;
1743         c.net = net;
1744         km_state_notify(NULL, &c);
1745
1746         return 0;
1747 }
1748
1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1750 {
1751         struct pfkey_sock *pfk = ptr;
1752         struct sk_buff *out_skb;
1753         struct sadb_msg *out_hdr;
1754
1755         if (!pfkey_can_dump(&pfk->sk))
1756                 return -ENOBUFS;
1757
1758         out_skb = pfkey_xfrm_state2msg(x);
1759         if (IS_ERR(out_skb))
1760                 return PTR_ERR(out_skb);
1761
1762         out_hdr = (struct sadb_msg *) out_skb->data;
1763         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1764         out_hdr->sadb_msg_type = SADB_DUMP;
1765         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1766         out_hdr->sadb_msg_errno = 0;
1767         out_hdr->sadb_msg_reserved = 0;
1768         out_hdr->sadb_msg_seq = count + 1;
1769         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1770
1771         if (pfk->dump.skb)
1772                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1773                                 &pfk->sk, sock_net(&pfk->sk));
1774         pfk->dump.skb = out_skb;
1775
1776         return 0;
1777 }
1778
1779 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1780 {
1781         struct net *net = sock_net(&pfk->sk);
1782         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1783 }
1784
1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1786 {
1787         xfrm_state_walk_done(&pfk->dump.u.state);
1788 }
1789
1790 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1791 {
1792         u8 proto;
1793         struct pfkey_sock *pfk = pfkey_sk(sk);
1794
1795         if (pfk->dump.dump != NULL)
1796                 return -EBUSY;
1797
1798         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1799         if (proto == 0)
1800                 return -EINVAL;
1801
1802         pfk->dump.msg_version = hdr->sadb_msg_version;
1803         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1804         pfk->dump.dump = pfkey_dump_sa;
1805         pfk->dump.done = pfkey_dump_sa_done;
1806         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1807
1808         return pfkey_do_dump(pfk);
1809 }
1810
1811 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1812 {
1813         struct pfkey_sock *pfk = pfkey_sk(sk);
1814         int satype = hdr->sadb_msg_satype;
1815         bool reset_errno = false;
1816
1817         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1818                 reset_errno = true;
1819                 if (satype != 0 && satype != 1)
1820                         return -EINVAL;
1821                 pfk->promisc = satype;
1822         }
1823         if (reset_errno && skb_cloned(skb))
1824                 skb = skb_copy(skb, GFP_KERNEL);
1825         else
1826                 skb = skb_clone(skb, GFP_KERNEL);
1827
1828         if (reset_errno && skb) {
1829                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1830                 new_hdr->sadb_msg_errno = 0;
1831         }
1832
1833         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1834         return 0;
1835 }
1836
1837 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1838 {
1839         int i;
1840         u32 reqid = *(u32*)ptr;
1841
1842         for (i=0; i<xp->xfrm_nr; i++) {
1843                 if (xp->xfrm_vec[i].reqid == reqid)
1844                         return -EEXIST;
1845         }
1846         return 0;
1847 }
1848
1849 static u32 gen_reqid(struct net *net)
1850 {
1851         struct xfrm_policy_walk walk;
1852         u32 start;
1853         int rc;
1854         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1855
1856         start = reqid;
1857         do {
1858                 ++reqid;
1859                 if (reqid == 0)
1860                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1861                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1862                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1863                 xfrm_policy_walk_done(&walk);
1864                 if (rc != -EEXIST)
1865                         return reqid;
1866         } while (reqid != start);
1867         return 0;
1868 }
1869
1870 static int
1871 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1872 {
1873         struct net *net = xp_net(xp);
1874         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1875         int mode;
1876
1877         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1878                 return -ELOOP;
1879
1880         if (rq->sadb_x_ipsecrequest_mode == 0)
1881                 return -EINVAL;
1882
1883         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1884         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1885                 return -EINVAL;
1886         t->mode = mode;
1887         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1888                 t->optional = 1;
1889         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1890                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1891                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1892                         t->reqid = 0;
1893                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1894                         return -ENOBUFS;
1895         }
1896
1897         /* addresses present only in tunnel mode */
1898         if (t->mode == XFRM_MODE_TUNNEL) {
1899                 u8 *sa = (u8 *) (rq + 1);
1900                 int family, socklen;
1901
1902                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1903                                                 &t->saddr);
1904                 if (!family)
1905                         return -EINVAL;
1906
1907                 socklen = pfkey_sockaddr_len(family);
1908                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1909                                            &t->id.daddr) != family)
1910                         return -EINVAL;
1911                 t->encap_family = family;
1912         } else
1913                 t->encap_family = xp->family;
1914
1915         /* No way to set this via kame pfkey */
1916         t->allalgs = 1;
1917         xp->xfrm_nr++;
1918         return 0;
1919 }
1920
1921 static int
1922 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1923 {
1924         int err;
1925         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1926         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1927
1928         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1929                 return -EINVAL;
1930
1931         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1932                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1933                         return err;
1934                 len -= rq->sadb_x_ipsecrequest_len;
1935                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1936         }
1937         return 0;
1938 }
1939
1940 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1941 {
1942   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1943
1944         if (xfrm_ctx) {
1945                 int len = sizeof(struct sadb_x_sec_ctx);
1946                 len += xfrm_ctx->ctx_len;
1947                 return PFKEY_ALIGN8(len);
1948         }
1949         return 0;
1950 }
1951
1952 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1953 {
1954         const struct xfrm_tmpl *t;
1955         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1956         int socklen = 0;
1957         int i;
1958
1959         for (i=0; i<xp->xfrm_nr; i++) {
1960                 t = xp->xfrm_vec + i;
1961                 socklen += pfkey_sockaddr_len(t->encap_family);
1962         }
1963
1964         return sizeof(struct sadb_msg) +
1965                 (sizeof(struct sadb_lifetime) * 3) +
1966                 (sizeof(struct sadb_address) * 2) +
1967                 (sockaddr_size * 2) +
1968                 sizeof(struct sadb_x_policy) +
1969                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1970                 (socklen * 2) +
1971                 pfkey_xfrm_policy2sec_ctx_size(xp);
1972 }
1973
1974 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1975 {
1976         struct sk_buff *skb;
1977         int size;
1978
1979         size = pfkey_xfrm_policy2msg_size(xp);
1980
1981         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1982         if (skb == NULL)
1983                 return ERR_PTR(-ENOBUFS);
1984
1985         return skb;
1986 }
1987
1988 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1989 {
1990         struct sadb_msg *hdr;
1991         struct sadb_address *addr;
1992         struct sadb_lifetime *lifetime;
1993         struct sadb_x_policy *pol;
1994         struct sadb_x_sec_ctx *sec_ctx;
1995         struct xfrm_sec_ctx *xfrm_ctx;
1996         int i;
1997         int size;
1998         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1999         int socklen = pfkey_sockaddr_len(xp->family);
2000
2001         size = pfkey_xfrm_policy2msg_size(xp);
2002
2003         /* call should fill header later */
2004         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2005         memset(hdr, 0, size);   /* XXX do we need this ? */
2006
2007         /* src address */
2008         addr = (struct sadb_address*) skb_put(skb,
2009                                               sizeof(struct sadb_address)+sockaddr_size);
2010         addr->sadb_address_len =
2011                 (sizeof(struct sadb_address)+sockaddr_size)/
2012                         sizeof(uint64_t);
2013         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2014         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2015         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2016         addr->sadb_address_reserved = 0;
2017         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2018                                  xp->selector.sport,
2019                                  (struct sockaddr *) (addr + 1),
2020                                  xp->family))
2021                 BUG();
2022
2023         /* dst address */
2024         addr = (struct sadb_address*) skb_put(skb,
2025                                               sizeof(struct sadb_address)+sockaddr_size);
2026         addr->sadb_address_len =
2027                 (sizeof(struct sadb_address)+sockaddr_size)/
2028                         sizeof(uint64_t);
2029         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2030         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2031         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2032         addr->sadb_address_reserved = 0;
2033
2034         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2035                             (struct sockaddr *) (addr + 1),
2036                             xp->family);
2037
2038         /* hard time */
2039         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2040                                                      sizeof(struct sadb_lifetime));
2041         lifetime->sadb_lifetime_len =
2042                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2043         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2044         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2045         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2046         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2047         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2048         /* soft time */
2049         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2050                                                      sizeof(struct sadb_lifetime));
2051         lifetime->sadb_lifetime_len =
2052                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2053         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2054         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2055         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2056         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2057         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2058         /* current time */
2059         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2060                                                      sizeof(struct sadb_lifetime));
2061         lifetime->sadb_lifetime_len =
2062                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2063         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2064         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2065         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2066         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2067         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2068
2069         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2070         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2071         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2072         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2073         if (xp->action == XFRM_POLICY_ALLOW) {
2074                 if (xp->xfrm_nr)
2075                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2076                 else
2077                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2078         }
2079         pol->sadb_x_policy_dir = dir+1;
2080         pol->sadb_x_policy_reserved = 0;
2081         pol->sadb_x_policy_id = xp->index;
2082         pol->sadb_x_policy_priority = xp->priority;
2083
2084         for (i=0; i<xp->xfrm_nr; i++) {
2085                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2086                 struct sadb_x_ipsecrequest *rq;
2087                 int req_size;
2088                 int mode;
2089
2090                 req_size = sizeof(struct sadb_x_ipsecrequest);
2091                 if (t->mode == XFRM_MODE_TUNNEL) {
2092                         socklen = pfkey_sockaddr_len(t->encap_family);
2093                         req_size += socklen * 2;
2094                 } else {
2095                         size -= 2*socklen;
2096                 }
2097                 rq = (void*)skb_put(skb, req_size);
2098                 pol->sadb_x_policy_len += req_size/8;
2099                 memset(rq, 0, sizeof(*rq));
2100                 rq->sadb_x_ipsecrequest_len = req_size;
2101                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2102                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2103                         return -EINVAL;
2104                 rq->sadb_x_ipsecrequest_mode = mode;
2105                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2106                 if (t->reqid)
2107                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2108                 if (t->optional)
2109                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2110                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2111
2112                 if (t->mode == XFRM_MODE_TUNNEL) {
2113                         u8 *sa = (void *)(rq + 1);
2114                         pfkey_sockaddr_fill(&t->saddr, 0,
2115                                             (struct sockaddr *)sa,
2116                                             t->encap_family);
2117                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2118                                             (struct sockaddr *) (sa + socklen),
2119                                             t->encap_family);
2120                 }
2121         }
2122
2123         /* security context */
2124         if ((xfrm_ctx = xp->security)) {
2125                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2126
2127                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2128                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2129                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2130                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2131                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2132                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2133                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2134                        xfrm_ctx->ctx_len);
2135         }
2136
2137         hdr->sadb_msg_len = size / sizeof(uint64_t);
2138         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2139
2140         return 0;
2141 }
2142
2143 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2144 {
2145         struct sk_buff *out_skb;
2146         struct sadb_msg *out_hdr;
2147         int err;
2148
2149         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2150         if (IS_ERR(out_skb))
2151                 return PTR_ERR(out_skb);
2152
2153         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2154         if (err < 0)
2155                 return err;
2156
2157         out_hdr = (struct sadb_msg *) out_skb->data;
2158         out_hdr->sadb_msg_version = PF_KEY_V2;
2159
2160         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2161                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2162         else
2163                 out_hdr->sadb_msg_type = event2poltype(c->event);
2164         out_hdr->sadb_msg_errno = 0;
2165         out_hdr->sadb_msg_seq = c->seq;
2166         out_hdr->sadb_msg_pid = c->portid;
2167         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2168         return 0;
2169
2170 }
2171
2172 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2173 {
2174         struct net *net = sock_net(sk);
2175         int err = 0;
2176         struct sadb_lifetime *lifetime;
2177         struct sadb_address *sa;
2178         struct sadb_x_policy *pol;
2179         struct xfrm_policy *xp;
2180         struct km_event c;
2181         struct sadb_x_sec_ctx *sec_ctx;
2182
2183         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2184                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2185             !ext_hdrs[SADB_X_EXT_POLICY-1])
2186                 return -EINVAL;
2187
2188         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2189         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2190                 return -EINVAL;
2191         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2192                 return -EINVAL;
2193
2194         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2195         if (xp == NULL)
2196                 return -ENOBUFS;
2197
2198         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2199                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2200         xp->priority = pol->sadb_x_policy_priority;
2201
2202         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2203         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2204         xp->selector.family = xp->family;
2205         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2206         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2207         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2208         if (xp->selector.sport)
2209                 xp->selector.sport_mask = htons(0xffff);
2210
2211         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2212         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2213         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2214
2215         /* Amusing, we set this twice.  KAME apps appear to set same value
2216          * in both addresses.
2217          */
2218         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2219
2220         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2221         if (xp->selector.dport)
2222                 xp->selector.dport_mask = htons(0xffff);
2223
2224         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2225         if (sec_ctx != NULL) {
2226                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2227
2228                 if (!uctx) {
2229                         err = -ENOBUFS;
2230                         goto out;
2231                 }
2232
2233                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2234                 kfree(uctx);
2235
2236                 if (err)
2237                         goto out;
2238         }
2239
2240         xp->lft.soft_byte_limit = XFRM_INF;
2241         xp->lft.hard_byte_limit = XFRM_INF;
2242         xp->lft.soft_packet_limit = XFRM_INF;
2243         xp->lft.hard_packet_limit = XFRM_INF;
2244         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2245                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2246                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2247                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2248                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2249         }
2250         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2251                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2252                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2253                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2254                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2255         }
2256         xp->xfrm_nr = 0;
2257         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2258             (err = parse_ipsecrequests(xp, pol)) < 0)
2259                 goto out;
2260
2261         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2262                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2263
2264         xfrm_audit_policy_add(xp, err ? 0 : 1,
2265                               audit_get_loginuid(current),
2266                               audit_get_sessionid(current), 0);
2267
2268         if (err)
2269                 goto out;
2270
2271         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2272                 c.event = XFRM_MSG_UPDPOLICY;
2273         else
2274                 c.event = XFRM_MSG_NEWPOLICY;
2275
2276         c.seq = hdr->sadb_msg_seq;
2277         c.portid = hdr->sadb_msg_pid;
2278
2279         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2280         xfrm_pol_put(xp);
2281         return 0;
2282
2283 out:
2284         xp->walk.dead = 1;
2285         xfrm_policy_destroy(xp);
2286         return err;
2287 }
2288
2289 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2290 {
2291         struct net *net = sock_net(sk);
2292         int err;
2293         struct sadb_address *sa;
2294         struct sadb_x_policy *pol;
2295         struct xfrm_policy *xp;
2296         struct xfrm_selector sel;
2297         struct km_event c;
2298         struct sadb_x_sec_ctx *sec_ctx;
2299         struct xfrm_sec_ctx *pol_ctx = NULL;
2300
2301         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2302                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2303             !ext_hdrs[SADB_X_EXT_POLICY-1])
2304                 return -EINVAL;
2305
2306         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2307         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2308                 return -EINVAL;
2309
2310         memset(&sel, 0, sizeof(sel));
2311
2312         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2313         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2314         sel.prefixlen_s = sa->sadb_address_prefixlen;
2315         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2316         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2317         if (sel.sport)
2318                 sel.sport_mask = htons(0xffff);
2319
2320         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2321         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2322         sel.prefixlen_d = sa->sadb_address_prefixlen;
2323         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2324         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2325         if (sel.dport)
2326                 sel.dport_mask = htons(0xffff);
2327
2328         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2329         if (sec_ctx != NULL) {
2330                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2331
2332                 if (!uctx)
2333                         return -ENOMEM;
2334
2335                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2336                 kfree(uctx);
2337                 if (err)
2338                         return err;
2339         }
2340
2341         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2342                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2343                                    1, &err);
2344         security_xfrm_policy_free(pol_ctx);
2345         if (xp == NULL)
2346                 return -ENOENT;
2347
2348         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2349                                  audit_get_loginuid(current),
2350                                  audit_get_sessionid(current), 0);
2351
2352         if (err)
2353                 goto out;
2354
2355         c.seq = hdr->sadb_msg_seq;
2356         c.portid = hdr->sadb_msg_pid;
2357         c.data.byid = 0;
2358         c.event = XFRM_MSG_DELPOLICY;
2359         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2360
2361 out:
2362         xfrm_pol_put(xp);
2363         if (err == 0)
2364                 xfrm_garbage_collect(net);
2365         return err;
2366 }
2367
2368 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2369 {
2370         int err;
2371         struct sk_buff *out_skb;
2372         struct sadb_msg *out_hdr;
2373         err = 0;
2374
2375         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2376         if (IS_ERR(out_skb)) {
2377                 err =  PTR_ERR(out_skb);
2378                 goto out;
2379         }
2380         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2381         if (err < 0)
2382                 goto out;
2383
2384         out_hdr = (struct sadb_msg *) out_skb->data;
2385         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2386         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2387         out_hdr->sadb_msg_satype = 0;
2388         out_hdr->sadb_msg_errno = 0;
2389         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2390         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2391         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2392         err = 0;
2393
2394 out:
2395         return err;
2396 }
2397
2398 #ifdef CONFIG_NET_KEY_MIGRATE
2399 static int pfkey_sockaddr_pair_size(sa_family_t family)
2400 {
2401         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2402 }
2403
2404 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2405                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2406                                u16 *family)
2407 {
2408         int af, socklen;
2409
2410         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2411                 return -EINVAL;
2412
2413         af = pfkey_sockaddr_extract(sa, saddr);
2414         if (!af)
2415                 return -EINVAL;
2416
2417         socklen = pfkey_sockaddr_len(af);
2418         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2419                                    daddr) != af)
2420                 return -EINVAL;
2421
2422         *family = af;
2423         return 0;
2424 }
2425
2426 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2427                                     struct xfrm_migrate *m)
2428 {
2429         int err;
2430         struct sadb_x_ipsecrequest *rq2;
2431         int mode;
2432
2433         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2434             len < rq1->sadb_x_ipsecrequest_len)
2435                 return -EINVAL;
2436
2437         /* old endoints */
2438         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2439                                   rq1->sadb_x_ipsecrequest_len,
2440                                   &m->old_saddr, &m->old_daddr,
2441                                   &m->old_family);
2442         if (err)
2443                 return err;
2444
2445         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2446         len -= rq1->sadb_x_ipsecrequest_len;
2447
2448         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2449             len < rq2->sadb_x_ipsecrequest_len)
2450                 return -EINVAL;
2451
2452         /* new endpoints */
2453         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2454                                   rq2->sadb_x_ipsecrequest_len,
2455                                   &m->new_saddr, &m->new_daddr,
2456                                   &m->new_family);
2457         if (err)
2458                 return err;
2459
2460         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2461             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2462             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2463                 return -EINVAL;
2464
2465         m->proto = rq1->sadb_x_ipsecrequest_proto;
2466         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2467                 return -EINVAL;
2468         m->mode = mode;
2469         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2470
2471         return ((int)(rq1->sadb_x_ipsecrequest_len +
2472                       rq2->sadb_x_ipsecrequest_len));
2473 }
2474
2475 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2476                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2477 {
2478         int i, len, ret, err = -EINVAL;
2479         u8 dir;
2480         struct sadb_address *sa;
2481         struct sadb_x_kmaddress *kma;
2482         struct sadb_x_policy *pol;
2483         struct sadb_x_ipsecrequest *rq;
2484         struct xfrm_selector sel;
2485         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2486         struct xfrm_kmaddress k;
2487
2488         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2489                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2490             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2491                 err = -EINVAL;
2492                 goto out;
2493         }
2494
2495         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2496         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2497
2498         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2499                 err = -EINVAL;
2500                 goto out;
2501         }
2502
2503         if (kma) {
2504                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2505                 k.reserved = kma->sadb_x_kmaddress_reserved;
2506                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2507                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2508                                           &k.local, &k.remote, &k.family);
2509                 if (ret < 0) {
2510                         err = ret;
2511                         goto out;
2512                 }
2513         }
2514
2515         dir = pol->sadb_x_policy_dir - 1;
2516         memset(&sel, 0, sizeof(sel));
2517
2518         /* set source address info of selector */
2519         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2520         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2521         sel.prefixlen_s = sa->sadb_address_prefixlen;
2522         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2523         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2524         if (sel.sport)
2525                 sel.sport_mask = htons(0xffff);
2526
2527         /* set destination address info of selector */
2528         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2529         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2530         sel.prefixlen_d = sa->sadb_address_prefixlen;
2531         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2532         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2533         if (sel.dport)
2534                 sel.dport_mask = htons(0xffff);
2535
2536         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2537
2538         /* extract ipsecrequests */
2539         i = 0;
2540         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2541
2542         while (len > 0 && i < XFRM_MAX_DEPTH) {
2543                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2544                 if (ret < 0) {
2545                         err = ret;
2546                         goto out;
2547                 } else {
2548                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2549                         len -= ret;
2550                         i++;
2551                 }
2552         }
2553
2554         if (!i || len > 0) {
2555                 err = -EINVAL;
2556                 goto out;
2557         }
2558
2559         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2560                             kma ? &k : NULL);
2561
2562  out:
2563         return err;
2564 }
2565 #else
2566 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2567                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2568 {
2569         return -ENOPROTOOPT;
2570 }
2571 #endif
2572
2573
2574 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2575 {
2576         struct net *net = sock_net(sk);
2577         unsigned int dir;
2578         int err = 0, delete;
2579         struct sadb_x_policy *pol;
2580         struct xfrm_policy *xp;
2581         struct km_event c;
2582
2583         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2584                 return -EINVAL;
2585
2586         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2587         if (dir >= XFRM_POLICY_MAX)
2588                 return -EINVAL;
2589
2590         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2591         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2592                               dir, pol->sadb_x_policy_id, delete, &err);
2593         if (xp == NULL)
2594                 return -ENOENT;
2595
2596         if (delete) {
2597                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2598                                 audit_get_loginuid(current),
2599                                 audit_get_sessionid(current), 0);
2600
2601                 if (err)
2602                         goto out;
2603                 c.seq = hdr->sadb_msg_seq;
2604                 c.portid = hdr->sadb_msg_pid;
2605                 c.data.byid = 1;
2606                 c.event = XFRM_MSG_DELPOLICY;
2607                 km_policy_notify(xp, dir, &c);
2608         } else {
2609                 err = key_pol_get_resp(sk, xp, hdr, dir);
2610         }
2611
2612 out:
2613         xfrm_pol_put(xp);
2614         if (delete && err == 0)
2615                 xfrm_garbage_collect(net);
2616         return err;
2617 }
2618
2619 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2620 {
2621         struct pfkey_sock *pfk = ptr;
2622         struct sk_buff *out_skb;
2623         struct sadb_msg *out_hdr;
2624         int err;
2625
2626         if (!pfkey_can_dump(&pfk->sk))
2627                 return -ENOBUFS;
2628
2629         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2630         if (IS_ERR(out_skb))
2631                 return PTR_ERR(out_skb);
2632
2633         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2634         if (err < 0)
2635                 return err;
2636
2637         out_hdr = (struct sadb_msg *) out_skb->data;
2638         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2639         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2640         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2641         out_hdr->sadb_msg_errno = 0;
2642         out_hdr->sadb_msg_seq = count + 1;
2643         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2644
2645         if (pfk->dump.skb)
2646                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2647                                 &pfk->sk, sock_net(&pfk->sk));
2648         pfk->dump.skb = out_skb;
2649
2650         return 0;
2651 }
2652
2653 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2654 {
2655         struct net *net = sock_net(&pfk->sk);
2656         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2657 }
2658
2659 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2660 {
2661         xfrm_policy_walk_done(&pfk->dump.u.policy);
2662 }
2663
2664 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2665 {
2666         struct pfkey_sock *pfk = pfkey_sk(sk);
2667
2668         if (pfk->dump.dump != NULL)
2669                 return -EBUSY;
2670
2671         pfk->dump.msg_version = hdr->sadb_msg_version;
2672         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2673         pfk->dump.dump = pfkey_dump_sp;
2674         pfk->dump.done = pfkey_dump_sp_done;
2675         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2676
2677         return pfkey_do_dump(pfk);
2678 }
2679
2680 static int key_notify_policy_flush(const struct km_event *c)
2681 {
2682         struct sk_buff *skb_out;
2683         struct sadb_msg *hdr;
2684
2685         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2686         if (!skb_out)
2687                 return -ENOBUFS;
2688         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2689         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2690         hdr->sadb_msg_seq = c->seq;
2691         hdr->sadb_msg_pid = c->portid;
2692         hdr->sadb_msg_version = PF_KEY_V2;
2693         hdr->sadb_msg_errno = (uint8_t) 0;
2694         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2695         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2696         hdr->sadb_msg_reserved = 0;
2697         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2698         return 0;
2699
2700 }
2701
2702 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2703 {
2704         struct net *net = sock_net(sk);
2705         struct km_event c;
2706         struct xfrm_audit audit_info;
2707         int err, err2;
2708
2709         audit_info.loginuid = audit_get_loginuid(current);
2710         audit_info.sessionid = audit_get_sessionid(current);
2711         audit_info.secid = 0;
2712         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2713         err2 = unicast_flush_resp(sk, hdr);
2714         if (err || err2) {
2715                 if (err == -ESRCH) /* empty table - old silent behavior */
2716                         return 0;
2717                 return err;
2718         }
2719
2720         c.data.type = XFRM_POLICY_TYPE_MAIN;
2721         c.event = XFRM_MSG_FLUSHPOLICY;
2722         c.portid = hdr->sadb_msg_pid;
2723         c.seq = hdr->sadb_msg_seq;
2724         c.net = net;
2725         km_policy_notify(NULL, 0, &c);
2726
2727         return 0;
2728 }
2729
2730 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2731                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2732 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2733         [SADB_RESERVED]         = pfkey_reserved,
2734         [SADB_GETSPI]           = pfkey_getspi,
2735         [SADB_UPDATE]           = pfkey_add,
2736         [SADB_ADD]              = pfkey_add,
2737         [SADB_DELETE]           = pfkey_delete,
2738         [SADB_GET]              = pfkey_get,
2739         [SADB_ACQUIRE]          = pfkey_acquire,
2740         [SADB_REGISTER]         = pfkey_register,
2741         [SADB_EXPIRE]           = NULL,
2742         [SADB_FLUSH]            = pfkey_flush,
2743         [SADB_DUMP]             = pfkey_dump,
2744         [SADB_X_PROMISC]        = pfkey_promisc,
2745         [SADB_X_PCHANGE]        = NULL,
2746         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2747         [SADB_X_SPDADD]         = pfkey_spdadd,
2748         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2749         [SADB_X_SPDGET]         = pfkey_spdget,
2750         [SADB_X_SPDACQUIRE]     = NULL,
2751         [SADB_X_SPDDUMP]        = pfkey_spddump,
2752         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2753         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2754         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2755         [SADB_X_MIGRATE]        = pfkey_migrate,
2756 };
2757
2758 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2759 {
2760         void *ext_hdrs[SADB_EXT_MAX];
2761         int err;
2762
2763         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2764                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2765
2766         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2767         err = parse_exthdrs(skb, hdr, ext_hdrs);
2768         if (!err) {
2769                 err = -EOPNOTSUPP;
2770                 if (pfkey_funcs[hdr->sadb_msg_type])
2771                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2772         }
2773         return err;
2774 }
2775
2776 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2777 {
2778         struct sadb_msg *hdr = NULL;
2779
2780         if (skb->len < sizeof(*hdr)) {
2781                 *errp = -EMSGSIZE;
2782         } else {
2783                 hdr = (struct sadb_msg *) skb->data;
2784                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2785                     hdr->sadb_msg_reserved != 0 ||
2786                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2787                      hdr->sadb_msg_type > SADB_MAX)) {
2788                         hdr = NULL;
2789                         *errp = -EINVAL;
2790                 } else if (hdr->sadb_msg_len != (skb->len /
2791                                                  sizeof(uint64_t)) ||
2792                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2793                                                 sizeof(uint64_t))) {
2794                         hdr = NULL;
2795                         *errp = -EMSGSIZE;
2796                 } else {
2797                         *errp = 0;
2798                 }
2799         }
2800         return hdr;
2801 }
2802
2803 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2804                                 const struct xfrm_algo_desc *d)
2805 {
2806         unsigned int id = d->desc.sadb_alg_id;
2807
2808         if (id >= sizeof(t->aalgos) * 8)
2809                 return 0;
2810
2811         return (t->aalgos >> id) & 1;
2812 }
2813
2814 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2815                                 const struct xfrm_algo_desc *d)
2816 {
2817         unsigned int id = d->desc.sadb_alg_id;
2818
2819         if (id >= sizeof(t->ealgos) * 8)
2820                 return 0;
2821
2822         return (t->ealgos >> id) & 1;
2823 }
2824
2825 static int count_ah_combs(const struct xfrm_tmpl *t)
2826 {
2827         int i, sz = 0;
2828
2829         for (i = 0; ; i++) {
2830                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2831                 if (!aalg)
2832                         break;
2833                 if (!aalg->pfkey_supported)
2834                         continue;
2835                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2836                         sz += sizeof(struct sadb_comb);
2837         }
2838         return sz + sizeof(struct sadb_prop);
2839 }
2840
2841 static int count_esp_combs(const struct xfrm_tmpl *t)
2842 {
2843         int i, k, sz = 0;
2844
2845         for (i = 0; ; i++) {
2846                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2847                 if (!ealg)
2848                         break;
2849
2850                 if (!ealg->pfkey_supported)
2851                         continue;
2852
2853                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2854                         continue;
2855
2856                 for (k = 1; ; k++) {
2857                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2858                         if (!aalg)
2859                                 break;
2860
2861                         if (!aalg->pfkey_supported)
2862                                 continue;
2863
2864                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2865                                 sz += sizeof(struct sadb_comb);
2866                 }
2867         }
2868         return sz + sizeof(struct sadb_prop);
2869 }
2870
2871 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2872 {
2873         struct sadb_prop *p;
2874         int i;
2875
2876         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2877         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2878         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2879         p->sadb_prop_replay = 32;
2880         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2881
2882         for (i = 0; ; i++) {
2883                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2884                 if (!aalg)
2885                         break;
2886
2887                 if (!aalg->pfkey_supported)
2888                         continue;
2889
2890                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2891                         struct sadb_comb *c;
2892                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2893                         memset(c, 0, sizeof(*c));
2894                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2895                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2896                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2897                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2898                         c->sadb_comb_hard_addtime = 24*60*60;
2899                         c->sadb_comb_soft_addtime = 20*60*60;
2900                         c->sadb_comb_hard_usetime = 8*60*60;
2901                         c->sadb_comb_soft_usetime = 7*60*60;
2902                 }
2903         }
2904 }
2905
2906 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2907 {
2908         struct sadb_prop *p;
2909         int i, k;
2910
2911         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2912         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2913         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2914         p->sadb_prop_replay = 32;
2915         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2916
2917         for (i=0; ; i++) {
2918                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2919                 if (!ealg)
2920                         break;
2921
2922                 if (!ealg->pfkey_supported)
2923                         continue;
2924
2925                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2926                         continue;
2927
2928                 for (k = 1; ; k++) {
2929                         struct sadb_comb *c;
2930                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931                         if (!aalg)
2932                                 break;
2933                         if (!aalg->pfkey_supported)
2934                                 continue;
2935                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2936                                 continue;
2937                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2938                         memset(c, 0, sizeof(*c));
2939                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2940                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2941                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2942                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2943                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2944                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2945                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2946                         c->sadb_comb_hard_addtime = 24*60*60;
2947                         c->sadb_comb_soft_addtime = 20*60*60;
2948                         c->sadb_comb_hard_usetime = 8*60*60;
2949                         c->sadb_comb_soft_usetime = 7*60*60;
2950                 }
2951         }
2952 }
2953
2954 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2955 {
2956         return 0;
2957 }
2958
2959 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2960 {
2961         struct sk_buff *out_skb;
2962         struct sadb_msg *out_hdr;
2963         int hard;
2964         int hsc;
2965
2966         hard = c->data.hard;
2967         if (hard)
2968                 hsc = 2;
2969         else
2970                 hsc = 1;
2971
2972         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2973         if (IS_ERR(out_skb))
2974                 return PTR_ERR(out_skb);
2975
2976         out_hdr = (struct sadb_msg *) out_skb->data;
2977         out_hdr->sadb_msg_version = PF_KEY_V2;
2978         out_hdr->sadb_msg_type = SADB_EXPIRE;
2979         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2980         out_hdr->sadb_msg_errno = 0;
2981         out_hdr->sadb_msg_reserved = 0;
2982         out_hdr->sadb_msg_seq = 0;
2983         out_hdr->sadb_msg_pid = 0;
2984
2985         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2986         return 0;
2987 }
2988
2989 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2990 {
2991         struct net *net = x ? xs_net(x) : c->net;
2992         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2993
2994         if (atomic_read(&net_pfkey->socks_nr) == 0)
2995                 return 0;
2996
2997         switch (c->event) {
2998         case XFRM_MSG_EXPIRE:
2999                 return key_notify_sa_expire(x, c);
3000         case XFRM_MSG_DELSA:
3001         case XFRM_MSG_NEWSA:
3002         case XFRM_MSG_UPDSA:
3003                 return key_notify_sa(x, c);
3004         case XFRM_MSG_FLUSHSA:
3005                 return key_notify_sa_flush(c);
3006         case XFRM_MSG_NEWAE: /* not yet supported */
3007                 break;
3008         default:
3009                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3010                 break;
3011         }
3012
3013         return 0;
3014 }
3015
3016 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3017 {
3018         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3019                 return 0;
3020
3021         switch (c->event) {
3022         case XFRM_MSG_POLEXPIRE:
3023                 return key_notify_policy_expire(xp, c);
3024         case XFRM_MSG_DELPOLICY:
3025         case XFRM_MSG_NEWPOLICY:
3026         case XFRM_MSG_UPDPOLICY:
3027                 return key_notify_policy(xp, dir, c);
3028         case XFRM_MSG_FLUSHPOLICY:
3029                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3030                         break;
3031                 return key_notify_policy_flush(c);
3032         default:
3033                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3034                 break;
3035         }
3036
3037         return 0;
3038 }
3039
3040 static u32 get_acqseq(void)
3041 {
3042         u32 res;
3043         static atomic_t acqseq;
3044
3045         do {
3046                 res = atomic_inc_return(&acqseq);
3047         } while (!res);
3048         return res;
3049 }
3050
3051 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3052 {
3053         struct sk_buff *skb;
3054         struct sadb_msg *hdr;
3055         struct sadb_address *addr;
3056         struct sadb_x_policy *pol;
3057         int sockaddr_size;
3058         int size;
3059         struct sadb_x_sec_ctx *sec_ctx;
3060         struct xfrm_sec_ctx *xfrm_ctx;
3061         int ctx_size = 0;
3062
3063         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3064         if (!sockaddr_size)
3065                 return -EINVAL;
3066
3067         size = sizeof(struct sadb_msg) +
3068                 (sizeof(struct sadb_address) * 2) +
3069                 (sockaddr_size * 2) +
3070                 sizeof(struct sadb_x_policy);
3071
3072         if (x->id.proto == IPPROTO_AH)
3073                 size += count_ah_combs(t);
3074         else if (x->id.proto == IPPROTO_ESP)
3075                 size += count_esp_combs(t);
3076
3077         if ((xfrm_ctx = x->security)) {
3078                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3079                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3080         }
3081
3082         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3083         if (skb == NULL)
3084                 return -ENOMEM;
3085
3086         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3087         hdr->sadb_msg_version = PF_KEY_V2;
3088         hdr->sadb_msg_type = SADB_ACQUIRE;
3089         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3090         hdr->sadb_msg_len = size / sizeof(uint64_t);
3091         hdr->sadb_msg_errno = 0;
3092         hdr->sadb_msg_reserved = 0;
3093         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3094         hdr->sadb_msg_pid = 0;
3095
3096         /* src address */
3097         addr = (struct sadb_address*) skb_put(skb,
3098                                               sizeof(struct sadb_address)+sockaddr_size);
3099         addr->sadb_address_len =
3100                 (sizeof(struct sadb_address)+sockaddr_size)/
3101                         sizeof(uint64_t);
3102         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3103         addr->sadb_address_proto = 0;
3104         addr->sadb_address_reserved = 0;
3105         addr->sadb_address_prefixlen =
3106                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3107                                     (struct sockaddr *) (addr + 1),
3108                                     x->props.family);
3109         if (!addr->sadb_address_prefixlen)
3110                 BUG();
3111
3112         /* dst address */
3113         addr = (struct sadb_address*) skb_put(skb,
3114                                               sizeof(struct sadb_address)+sockaddr_size);
3115         addr->sadb_address_len =
3116                 (sizeof(struct sadb_address)+sockaddr_size)/
3117                         sizeof(uint64_t);
3118         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3119         addr->sadb_address_proto = 0;
3120         addr->sadb_address_reserved = 0;
3121         addr->sadb_address_prefixlen =
3122                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3123                                     (struct sockaddr *) (addr + 1),
3124                                     x->props.family);
3125         if (!addr->sadb_address_prefixlen)
3126                 BUG();
3127
3128         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3129         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3130         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3131         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3132         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3133         pol->sadb_x_policy_reserved = 0;
3134         pol->sadb_x_policy_id = xp->index;
3135         pol->sadb_x_policy_priority = xp->priority;
3136
3137         /* Set sadb_comb's. */
3138         if (x->id.proto == IPPROTO_AH)
3139                 dump_ah_combs(skb, t);
3140         else if (x->id.proto == IPPROTO_ESP)
3141                 dump_esp_combs(skb, t);
3142
3143         /* security context */
3144         if (xfrm_ctx) {
3145                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3146                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3147                 sec_ctx->sadb_x_sec_len =
3148                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3149                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3150                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3151                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3152                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3153                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3154                        xfrm_ctx->ctx_len);
3155         }
3156
3157         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3158 }
3159
3160 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3161                                                 u8 *data, int len, int *dir)
3162 {
3163         struct net *net = sock_net(sk);
3164         struct xfrm_policy *xp;
3165         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3166         struct sadb_x_sec_ctx *sec_ctx;
3167
3168         switch (sk->sk_family) {
3169         case AF_INET:
3170                 if (opt != IP_IPSEC_POLICY) {
3171                         *dir = -EOPNOTSUPP;
3172                         return NULL;
3173                 }
3174                 break;
3175 #if IS_ENABLED(CONFIG_IPV6)
3176         case AF_INET6:
3177                 if (opt != IPV6_IPSEC_POLICY) {
3178                         *dir = -EOPNOTSUPP;
3179                         return NULL;
3180                 }
3181                 break;
3182 #endif
3183         default:
3184                 *dir = -EINVAL;
3185                 return NULL;
3186         }
3187
3188         *dir = -EINVAL;
3189
3190         if (len < sizeof(struct sadb_x_policy) ||
3191             pol->sadb_x_policy_len*8 > len ||
3192             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3193             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3194                 return NULL;
3195
3196         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3197         if (xp == NULL) {
3198                 *dir = -ENOBUFS;
3199                 return NULL;
3200         }
3201
3202         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3203                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3204
3205         xp->lft.soft_byte_limit = XFRM_INF;
3206         xp->lft.hard_byte_limit = XFRM_INF;
3207         xp->lft.soft_packet_limit = XFRM_INF;
3208         xp->lft.hard_packet_limit = XFRM_INF;
3209         xp->family = sk->sk_family;
3210
3211         xp->xfrm_nr = 0;
3212         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3213             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3214                 goto out;
3215
3216         /* security context too */
3217         if (len >= (pol->sadb_x_policy_len*8 +
3218             sizeof(struct sadb_x_sec_ctx))) {
3219                 char *p = (char *)pol;
3220                 struct xfrm_user_sec_ctx *uctx;
3221
3222                 p += pol->sadb_x_policy_len*8;
3223                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3224                 if (len < pol->sadb_x_policy_len*8 +
3225                     sec_ctx->sadb_x_sec_len) {
3226                         *dir = -EINVAL;
3227                         goto out;
3228                 }
3229                 if ((*dir = verify_sec_ctx_len(p)))
3230                         goto out;
3231                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3232                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3233                 kfree(uctx);
3234
3235                 if (*dir)
3236                         goto out;
3237         }
3238
3239         *dir = pol->sadb_x_policy_dir-1;
3240         return xp;
3241
3242 out:
3243         xp->walk.dead = 1;
3244         xfrm_policy_destroy(xp);
3245         return NULL;
3246 }
3247
3248 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3249 {
3250         struct sk_buff *skb;
3251         struct sadb_msg *hdr;
3252         struct sadb_sa *sa;
3253         struct sadb_address *addr;
3254         struct sadb_x_nat_t_port *n_port;
3255         int sockaddr_size;
3256         int size;
3257         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3258         struct xfrm_encap_tmpl *natt = NULL;
3259
3260         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3261         if (!sockaddr_size)
3262                 return -EINVAL;
3263
3264         if (!satype)
3265                 return -EINVAL;
3266
3267         if (!x->encap)
3268                 return -EINVAL;
3269
3270         natt = x->encap;
3271
3272         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3273          *
3274          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3275          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3276          */
3277
3278         size = sizeof(struct sadb_msg) +
3279                 sizeof(struct sadb_sa) +
3280                 (sizeof(struct sadb_address) * 2) +
3281                 (sockaddr_size * 2) +
3282                 (sizeof(struct sadb_x_nat_t_port) * 2);
3283
3284         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3285         if (skb == NULL)
3286                 return -ENOMEM;
3287
3288         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3289         hdr->sadb_msg_version = PF_KEY_V2;
3290         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3291         hdr->sadb_msg_satype = satype;
3292         hdr->sadb_msg_len = size / sizeof(uint64_t);
3293         hdr->sadb_msg_errno = 0;
3294         hdr->sadb_msg_reserved = 0;
3295         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3296         hdr->sadb_msg_pid = 0;
3297
3298         /* SA */
3299         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3300         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3301         sa->sadb_sa_exttype = SADB_EXT_SA;
3302         sa->sadb_sa_spi = x->id.spi;
3303         sa->sadb_sa_replay = 0;
3304         sa->sadb_sa_state = 0;
3305         sa->sadb_sa_auth = 0;
3306         sa->sadb_sa_encrypt = 0;
3307         sa->sadb_sa_flags = 0;
3308
3309         /* ADDRESS_SRC (old addr) */
3310         addr = (struct sadb_address*)
3311                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3312         addr->sadb_address_len =
3313                 (sizeof(struct sadb_address)+sockaddr_size)/
3314                         sizeof(uint64_t);
3315         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3316         addr->sadb_address_proto = 0;
3317         addr->sadb_address_reserved = 0;
3318         addr->sadb_address_prefixlen =
3319                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3320                                     (struct sockaddr *) (addr + 1),
3321                                     x->props.family);
3322         if (!addr->sadb_address_prefixlen)
3323                 BUG();
3324
3325         /* NAT_T_SPORT (old port) */
3326         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3327         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3328         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3329         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3330         n_port->sadb_x_nat_t_port_reserved = 0;
3331
3332         /* ADDRESS_DST (new addr) */
3333         addr = (struct sadb_address*)
3334                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3335         addr->sadb_address_len =
3336                 (sizeof(struct sadb_address)+sockaddr_size)/
3337                         sizeof(uint64_t);
3338         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3339         addr->sadb_address_proto = 0;
3340         addr->sadb_address_reserved = 0;
3341         addr->sadb_address_prefixlen =
3342                 pfkey_sockaddr_fill(ipaddr, 0,
3343                                     (struct sockaddr *) (addr + 1),
3344                                     x->props.family);
3345         if (!addr->sadb_address_prefixlen)
3346                 BUG();
3347
3348         /* NAT_T_DPORT (new port) */
3349         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3350         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3351         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3352         n_port->sadb_x_nat_t_port_port = sport;
3353         n_port->sadb_x_nat_t_port_reserved = 0;
3354
3355         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3356 }
3357
3358 #ifdef CONFIG_NET_KEY_MIGRATE
3359 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3360                             const struct xfrm_selector *sel)
3361 {
3362         struct sadb_address *addr;
3363         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3364         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3365         addr->sadb_address_exttype = type;
3366         addr->sadb_address_proto = sel->proto;
3367         addr->sadb_address_reserved = 0;
3368
3369         switch (type) {
3370         case SADB_EXT_ADDRESS_SRC:
3371                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3372                 pfkey_sockaddr_fill(&sel->saddr, 0,
3373                                     (struct sockaddr *)(addr + 1),
3374                                     sel->family);
3375                 break;
3376         case SADB_EXT_ADDRESS_DST:
3377                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3378                 pfkey_sockaddr_fill(&sel->daddr, 0,
3379                                     (struct sockaddr *)(addr + 1),
3380                                     sel->family);
3381                 break;
3382         default:
3383                 return -EINVAL;
3384         }
3385
3386         return 0;
3387 }
3388
3389
3390 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3391 {
3392         struct sadb_x_kmaddress *kma;
3393         u8 *sa;
3394         int family = k->family;
3395         int socklen = pfkey_sockaddr_len(family);
3396         int size_req;
3397
3398         size_req = (sizeof(struct sadb_x_kmaddress) +
3399                     pfkey_sockaddr_pair_size(family));
3400
3401         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3402         memset(kma, 0, size_req);
3403         kma->sadb_x_kmaddress_len = size_req / 8;
3404         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3405         kma->sadb_x_kmaddress_reserved = k->reserved;
3406
3407         sa = (u8 *)(kma + 1);
3408         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3409             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3410                 return -EINVAL;
3411
3412         return 0;
3413 }
3414
3415 static int set_ipsecrequest(struct sk_buff *skb,
3416                             uint8_t proto, uint8_t mode, int level,
3417                             uint32_t reqid, uint8_t family,
3418                             const xfrm_address_t *src, const xfrm_address_t *dst)
3419 {
3420         struct sadb_x_ipsecrequest *rq;
3421         u8 *sa;
3422         int socklen = pfkey_sockaddr_len(family);
3423         int size_req;
3424
3425         size_req = sizeof(struct sadb_x_ipsecrequest) +
3426                    pfkey_sockaddr_pair_size(family);
3427
3428         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3429         memset(rq, 0, size_req);
3430         rq->sadb_x_ipsecrequest_len = size_req;
3431         rq->sadb_x_ipsecrequest_proto = proto;
3432         rq->sadb_x_ipsecrequest_mode = mode;
3433         rq->sadb_x_ipsecrequest_level = level;
3434         rq->sadb_x_ipsecrequest_reqid = reqid;
3435
3436         sa = (u8 *) (rq + 1);
3437         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3438             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3439                 return -EINVAL;
3440
3441         return 0;
3442 }
3443 #endif
3444
3445 #ifdef CONFIG_NET_KEY_MIGRATE
3446 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3447                               const struct xfrm_migrate *m, int num_bundles,
3448                               const struct xfrm_kmaddress *k)
3449 {
3450         int i;
3451         int sasize_sel;
3452         int size = 0;
3453         int size_pol = 0;
3454         struct sk_buff *skb;
3455         struct sadb_msg *hdr;
3456         struct sadb_x_policy *pol;
3457         const struct xfrm_migrate *mp;
3458
3459         if (type != XFRM_POLICY_TYPE_MAIN)
3460                 return 0;
3461
3462         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3463                 return -EINVAL;
3464
3465         if (k != NULL) {
3466                 /* addresses for KM */
3467                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3468                                      pfkey_sockaddr_pair_size(k->family));
3469         }
3470
3471         /* selector */
3472         sasize_sel = pfkey_sockaddr_size(sel->family);
3473         if (!sasize_sel)
3474                 return -EINVAL;
3475         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3476
3477         /* policy info */
3478         size_pol += sizeof(struct sadb_x_policy);
3479
3480         /* ipsecrequests */
3481         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3482                 /* old locator pair */
3483                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3484                             pfkey_sockaddr_pair_size(mp->old_family);
3485                 /* new locator pair */
3486                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3487                             pfkey_sockaddr_pair_size(mp->new_family);
3488         }
3489
3490         size += sizeof(struct sadb_msg) + size_pol;
3491
3492         /* alloc buffer */
3493         skb = alloc_skb(size, GFP_ATOMIC);
3494         if (skb == NULL)
3495                 return -ENOMEM;
3496
3497         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3498         hdr->sadb_msg_version = PF_KEY_V2;
3499         hdr->sadb_msg_type = SADB_X_MIGRATE;
3500         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3501         hdr->sadb_msg_len = size / 8;
3502         hdr->sadb_msg_errno = 0;
3503         hdr->sadb_msg_reserved = 0;
3504         hdr->sadb_msg_seq = 0;
3505         hdr->sadb_msg_pid = 0;
3506
3507         /* Addresses to be used by KM for negotiation, if ext is available */
3508         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3509                 goto err;
3510
3511         /* selector src */
3512         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3513
3514         /* selector dst */
3515         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3516
3517         /* policy information */
3518         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3519         pol->sadb_x_policy_len = size_pol / 8;
3520         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3521         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3522         pol->sadb_x_policy_dir = dir + 1;
3523         pol->sadb_x_policy_reserved = 0;
3524         pol->sadb_x_policy_id = 0;
3525         pol->sadb_x_policy_priority = 0;
3526
3527         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3528                 /* old ipsecrequest */
3529                 int mode = pfkey_mode_from_xfrm(mp->mode);
3530                 if (mode < 0)
3531                         goto err;
3532                 if (set_ipsecrequest(skb, mp->proto, mode,
3533                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3534                                      mp->reqid, mp->old_family,
3535                                      &mp->old_saddr, &mp->old_daddr) < 0)
3536                         goto err;
3537
3538                 /* new ipsecrequest */
3539                 if (set_ipsecrequest(skb, mp->proto, mode,
3540                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3541                                      mp->reqid, mp->new_family,
3542                                      &mp->new_saddr, &mp->new_daddr) < 0)
3543                         goto err;
3544         }
3545
3546         /* broadcast migrate message to sockets */
3547         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3548
3549         return 0;
3550
3551 err:
3552         kfree_skb(skb);
3553         return -EINVAL;
3554 }
3555 #else
3556 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3557                               const struct xfrm_migrate *m, int num_bundles,
3558                               const struct xfrm_kmaddress *k)
3559 {
3560         return -ENOPROTOOPT;
3561 }
3562 #endif
3563
3564 static int pfkey_sendmsg(struct kiocb *kiocb,
3565                          struct socket *sock, struct msghdr *msg, size_t len)
3566 {
3567         struct sock *sk = sock->sk;
3568         struct sk_buff *skb = NULL;
3569         struct sadb_msg *hdr = NULL;
3570         int err;
3571
3572         err = -EOPNOTSUPP;
3573         if (msg->msg_flags & MSG_OOB)
3574                 goto out;
3575
3576         err = -EMSGSIZE;
3577         if ((unsigned int)len > sk->sk_sndbuf - 32)
3578                 goto out;
3579
3580         err = -ENOBUFS;
3581         skb = alloc_skb(len, GFP_KERNEL);
3582         if (skb == NULL)
3583                 goto out;
3584
3585         err = -EFAULT;
3586         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3587                 goto out;
3588
3589         hdr = pfkey_get_base_msg(skb, &err);
3590         if (!hdr)
3591                 goto out;
3592
3593         mutex_lock(&xfrm_cfg_mutex);
3594         err = pfkey_process(sk, skb, hdr);
3595         mutex_unlock(&xfrm_cfg_mutex);
3596
3597 out:
3598         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3599                 err = 0;
3600         kfree_skb(skb);
3601
3602         return err ? : len;
3603 }
3604
3605 static int pfkey_recvmsg(struct kiocb *kiocb,
3606                          struct socket *sock, struct msghdr *msg, size_t len,
3607                          int flags)
3608 {
3609         struct sock *sk = sock->sk;
3610         struct pfkey_sock *pfk = pfkey_sk(sk);
3611         struct sk_buff *skb;
3612         int copied, err;
3613
3614         err = -EINVAL;
3615         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3616                 goto out;
3617
3618         msg->msg_namelen = 0;
3619         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3620         if (skb == NULL)
3621                 goto out;
3622
3623         copied = skb->len;
3624         if (copied > len) {
3625                 msg->msg_flags |= MSG_TRUNC;
3626                 copied = len;
3627         }
3628
3629         skb_reset_transport_header(skb);
3630         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3631         if (err)
3632                 goto out_free;
3633
3634         sock_recv_ts_and_drops(msg, sk, skb);
3635
3636         err = (flags & MSG_TRUNC) ? skb->len : copied;
3637
3638         if (pfk->dump.dump != NULL &&
3639             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3640                 pfkey_do_dump(pfk);
3641
3642 out_free:
3643         skb_free_datagram(sk, skb);
3644 out:
3645         return err;
3646 }
3647
3648 static const struct proto_ops pfkey_ops = {
3649         .family         =       PF_KEY,
3650         .owner          =       THIS_MODULE,
3651         /* Operations that make no sense on pfkey sockets. */
3652         .bind           =       sock_no_bind,
3653         .connect        =       sock_no_connect,
3654         .socketpair     =       sock_no_socketpair,
3655         .accept         =       sock_no_accept,
3656         .getname        =       sock_no_getname,
3657         .ioctl          =       sock_no_ioctl,
3658         .listen         =       sock_no_listen,
3659         .shutdown       =       sock_no_shutdown,
3660         .setsockopt     =       sock_no_setsockopt,
3661         .getsockopt     =       sock_no_getsockopt,
3662         .mmap           =       sock_no_mmap,
3663         .sendpage       =       sock_no_sendpage,
3664
3665         /* Now the operations that really occur. */
3666         .release        =       pfkey_release,
3667         .poll           =       datagram_poll,
3668         .sendmsg        =       pfkey_sendmsg,
3669         .recvmsg        =       pfkey_recvmsg,
3670 };
3671
3672 static const struct net_proto_family pfkey_family_ops = {
3673         .family =       PF_KEY,
3674         .create =       pfkey_create,
3675         .owner  =       THIS_MODULE,
3676 };
3677
3678 #ifdef CONFIG_PROC_FS
3679 static int pfkey_seq_show(struct seq_file *f, void *v)
3680 {
3681         struct sock *s = sk_entry(v);
3682
3683         if (v == SEQ_START_TOKEN)
3684                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3685         else
3686                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3687                                s,
3688                                atomic_read(&s->sk_refcnt),
3689                                sk_rmem_alloc_get(s),
3690                                sk_wmem_alloc_get(s),
3691                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3692                                sock_i_ino(s)
3693                                );
3694         return 0;
3695 }
3696
3697 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3698         __acquires(rcu)
3699 {
3700         struct net *net = seq_file_net(f);
3701         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3702
3703         rcu_read_lock();
3704         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3705 }
3706
3707 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3708 {
3709         struct net *net = seq_file_net(f);
3710         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3711
3712         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3713 }
3714
3715 static void pfkey_seq_stop(struct seq_file *f, void *v)
3716         __releases(rcu)
3717 {
3718         rcu_read_unlock();
3719 }
3720
3721 static const struct seq_operations pfkey_seq_ops = {
3722         .start  = pfkey_seq_start,
3723         .next   = pfkey_seq_next,
3724         .stop   = pfkey_seq_stop,
3725         .show   = pfkey_seq_show,
3726 };
3727
3728 static int pfkey_seq_open(struct inode *inode, struct file *file)
3729 {
3730         return seq_open_net(inode, file, &pfkey_seq_ops,
3731                             sizeof(struct seq_net_private));
3732 }
3733
3734 static const struct file_operations pfkey_proc_ops = {
3735         .open    = pfkey_seq_open,
3736         .read    = seq_read,
3737         .llseek  = seq_lseek,
3738         .release = seq_release_net,
3739 };
3740
3741 static int __net_init pfkey_init_proc(struct net *net)
3742 {
3743         struct proc_dir_entry *e;
3744
3745         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3746         if (e == NULL)
3747                 return -ENOMEM;
3748
3749         return 0;
3750 }
3751
3752 static void __net_exit pfkey_exit_proc(struct net *net)
3753 {
3754         remove_proc_entry("pfkey", net->proc_net);
3755 }
3756 #else
3757 static inline int pfkey_init_proc(struct net *net)
3758 {
3759         return 0;
3760 }
3761
3762 static inline void pfkey_exit_proc(struct net *net)
3763 {
3764 }
3765 #endif
3766
3767 static struct xfrm_mgr pfkeyv2_mgr =
3768 {
3769         .id             = "pfkeyv2",
3770         .notify         = pfkey_send_notify,
3771         .acquire        = pfkey_send_acquire,
3772         .compile_policy = pfkey_compile_policy,
3773         .new_mapping    = pfkey_send_new_mapping,
3774         .notify_policy  = pfkey_send_policy_notify,
3775         .migrate        = pfkey_send_migrate,
3776 };
3777
3778 static int __net_init pfkey_net_init(struct net *net)
3779 {
3780         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3781         int rv;
3782
3783         INIT_HLIST_HEAD(&net_pfkey->table);
3784         atomic_set(&net_pfkey->socks_nr, 0);
3785
3786         rv = pfkey_init_proc(net);
3787
3788         return rv;
3789 }
3790
3791 static void __net_exit pfkey_net_exit(struct net *net)
3792 {
3793         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3794
3795         pfkey_exit_proc(net);
3796         BUG_ON(!hlist_empty(&net_pfkey->table));
3797 }
3798
3799 static struct pernet_operations pfkey_net_ops = {
3800         .init = pfkey_net_init,
3801         .exit = pfkey_net_exit,
3802         .id   = &pfkey_net_id,
3803         .size = sizeof(struct netns_pfkey),
3804 };
3805
3806 static void __exit ipsec_pfkey_exit(void)
3807 {
3808         xfrm_unregister_km(&pfkeyv2_mgr);
3809         sock_unregister(PF_KEY);
3810         unregister_pernet_subsys(&pfkey_net_ops);
3811         proto_unregister(&key_proto);
3812 }
3813
3814 static int __init ipsec_pfkey_init(void)
3815 {
3816         int err = proto_register(&key_proto, 0);
3817
3818         if (err != 0)
3819                 goto out;
3820
3821         err = register_pernet_subsys(&pfkey_net_ops);
3822         if (err != 0)
3823                 goto out_unregister_key_proto;
3824         err = sock_register(&pfkey_family_ops);
3825         if (err != 0)
3826                 goto out_unregister_pernet;
3827         err = xfrm_register_km(&pfkeyv2_mgr);
3828         if (err != 0)
3829                 goto out_sock_unregister;
3830 out:
3831         return err;
3832
3833 out_sock_unregister:
3834         sock_unregister(PF_KEY);
3835 out_unregister_pernet:
3836         unregister_pernet_subsys(&pfkey_net_ops);
3837 out_unregister_key_proto:
3838         proto_unregister(&key_proto);
3839         goto out;
3840 }
3841
3842 module_init(ipsec_pfkey_init);
3843 module_exit(ipsec_pfkey_exit);
3844 MODULE_LICENSE("GPL");
3845 MODULE_ALIAS_NETPROTO(PF_KEY);