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