net/key/af_key.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   4  *
   5  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
   6  *              David S. Miller <davem@redhat.com>
   7  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
   8  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  10  *              Derek Atkins <derek@ihtfp.com>
  11  */
  12
  13 #include <linux/capability.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/socket.h>
  17 #include <linux/pfkeyv2.h>
  18 #include <linux/ipsec.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/in.h>
  22 #include <linux/in6.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <net/net_namespace.h>
  27 #include <net/netns/generic.h>
  28 #include <net/xfrm.h>
  29
  30 #include <net/sock.h>
  31
  32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  34
  35 static unsigned int pfkey_net_id __read_mostly;
  36 struct netns_pfkey {
  37         /* List of all pfkey sockets. */
  38         struct hlist_head table;
  39         atomic_t socks_nr;
  40 };
  41 static DEFINE_MUTEX(pfkey_mutex);
  42
  43 #define DUMMY_MARK 0
  44 static const struct xfrm_mark dummy_mark = {0, 0};
  45 struct pfkey_sock {
  46         /* struct sock must be the first member of struct pfkey_sock */
  47         struct sock     sk;
  48         int             registered;
  49         int             promisc;
  50
  51         struct {
  52                 uint8_t         msg_version;
  53                 uint32_t        msg_portid;
  54                 int             (*dump)(struct pfkey_sock *sk);
  55                 void            (*done)(struct pfkey_sock *sk);
  56                 union {
  57                         struct xfrm_policy_walk policy;
  58                         struct xfrm_state_walk  state;
  59                 } u;
  60                 struct sk_buff  *skb;
  61         } dump;
  62         struct mutex dump_lock;
  63 };
  64
  65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  66                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  67                                u16 *family);
  68
  69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  70 {
  71         return (struct pfkey_sock *)sk;
  72 }
  73
  74 static int pfkey_can_dump(const struct sock *sk)
  75 {
  76         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  77                 return 1;
  78         return 0;
  79 }
  80
  81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  82 {
  83         if (pfk->dump.dump) {
  84                 if (pfk->dump.skb) {
  85                         kfree_skb(pfk->dump.skb);
  86                         pfk->dump.skb = NULL;
  87                 }
  88                 pfk->dump.done(pfk);
  89                 pfk->dump.dump = NULL;
  90                 pfk->dump.done = NULL;
  91         }
  92 }
  93
  94 static void pfkey_sock_destruct(struct sock *sk)
  95 {
  96         struct net *net = sock_net(sk);
  97         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  98
  99         pfkey_terminate_dump(pfkey_sk(sk));
 100         skb_queue_purge(&sk->sk_receive_queue);
 101
 102         if (!sock_flag(sk, SOCK_DEAD)) {
 103                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 104                 return;
 105         }
 106
 107         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 108         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 109
 110         atomic_dec(&net_pfkey->socks_nr);
 111 }
 112
 113 static const struct proto_ops pfkey_ops;
 114
 115 static void pfkey_insert(struct sock *sk)
 116 {
 117         struct net *net = sock_net(sk);
 118         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 119
 120         mutex_lock(&pfkey_mutex);
 121         sk_add_node_rcu(sk, &net_pfkey->table);
 122         mutex_unlock(&pfkey_mutex);
 123 }
 124
 125 static void pfkey_remove(struct sock *sk)
 126 {
 127         mutex_lock(&pfkey_mutex);
 128         sk_del_node_init_rcu(sk);
 129         mutex_unlock(&pfkey_mutex);
 130 }
 131
 132 static struct proto key_proto = {
 133         .name     = "KEY",
 134         .owner    = THIS_MODULE,
 135         .obj_size = sizeof(struct pfkey_sock),
 136 };
 137
 138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 139                         int kern)
 140 {
 141         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 142         struct sock *sk;
 143         struct pfkey_sock *pfk;
 144
 145         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 146                 return -EPERM;
 147         if (sock->type != SOCK_RAW)
 148                 return -ESOCKTNOSUPPORT;
 149         if (protocol != PF_KEY_V2)
 150                 return -EPROTONOSUPPORT;
 151
 152         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 153         if (sk == NULL)
 154                 return -ENOMEM;
 155
 156         pfk = pfkey_sk(sk);
 157         mutex_init(&pfk->dump_lock);
 158
 159         sock->ops = &pfkey_ops;
 160         sock_init_data(sock, sk);
 161
 162         sk->sk_family = PF_KEY;
 163         sk->sk_destruct = pfkey_sock_destruct;
 164
 165         atomic_inc(&net_pfkey->socks_nr);
 166
 167         pfkey_insert(sk);
 168
 169         return 0;
 170 }
 171
 172 static int pfkey_release(struct socket *sock)
 173 {
 174         struct sock *sk = sock->sk;
 175
 176         if (!sk)
 177                 return 0;
 178
 179         pfkey_remove(sk);
 180
 181         sock_orphan(sk);
 182         sock->sk = NULL;
 183         skb_queue_purge(&sk->sk_write_queue);
 184
 185         synchronize_rcu();
 186         sock_put(sk);
 187
 188         return 0;
 189 }
 190
 191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
 192                                struct sock *sk)
 193 {
 194         int err = -ENOBUFS;
 195
 196         if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 197                 return err;
 198
 199         skb = skb_clone(skb, allocation);
 200
 201         if (skb) {
 202                 skb_set_owner_r(skb, sk);
 203                 skb_queue_tail(&sk->sk_receive_queue, skb);
 204                 sk->sk_data_ready(sk);
 205                 err = 0;
 206         }
 207         return err;
 208 }
 209
 210 /* Send SKB to all pfkey sockets matching selected criteria.  */
 211 #define BROADCAST_ALL           0
 212 #define BROADCAST_ONE           1
 213 #define BROADCAST_REGISTERED    2
 214 #define BROADCAST_PROMISC_ONLY  4
 215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 216                            int broadcast_flags, struct sock *one_sk,
 217                            struct net *net)
 218 {
 219         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 220         struct sock *sk;
 221         int err = -ESRCH;
 222
 223         /* XXX Do we need something like netlink_overrun?  I think
 224          * XXX PF_KEY socket apps will not mind current behavior.
 225          */
 226         if (!skb)
 227                 return -ENOMEM;
 228
 229         rcu_read_lock();
 230         sk_for_each_rcu(sk, &net_pfkey->table) {
 231                 struct pfkey_sock *pfk = pfkey_sk(sk);
 232                 int err2;
 233
 234                 /* Yes, it means that if you are meant to receive this
 235                  * pfkey message you receive it twice as promiscuous
 236                  * socket.
 237                  */
 238                 if (pfk->promisc)
 239                         pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 240
 241                 /* the exact target will be processed later */
 242                 if (sk == one_sk)
 243                         continue;
 244                 if (broadcast_flags != BROADCAST_ALL) {
 245                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 246                                 continue;
 247                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 248                             !pfk->registered)
 249                                 continue;
 250                         if (broadcast_flags & BROADCAST_ONE)
 251                                 continue;
 252                 }
 253
 254                 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 255
 256                 /* Error is cleared after successful sending to at least one
 257                  * registered KM */
 258                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 259                         err = err2;
 260         }
 261         rcu_read_unlock();
 262
 263         if (one_sk != NULL)
 264                 err = pfkey_broadcast_one(skb, allocation, one_sk);
 265
 266         kfree_skb(skb);
 267         return err;
 268 }
 269
 270 static int pfkey_do_dump(struct pfkey_sock *pfk)
 271 {
 272         struct sadb_msg *hdr;
 273         int rc;
 274
 275         mutex_lock(&pfk->dump_lock);
 276         if (!pfk->dump.dump) {
 277                 rc = 0;
 278                 goto out;
 279         }
 280
 281         rc = pfk->dump.dump(pfk);
 282         if (rc == -ENOBUFS) {
 283                 rc = 0;
 284                 goto out;
 285         }
 286
 287         if (pfk->dump.skb) {
 288                 if (!pfkey_can_dump(&pfk->sk)) {
 289                         rc = 0;
 290                         goto out;
 291                 }
 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
 303 out:
 304         mutex_unlock(&pfk->dump_lock);
 305         return rc;
 306 }
 307
 308 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 309                                  const struct sadb_msg *orig)
 310 {
 311         *new = *orig;
 312 }
 313
 314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 315 {
 316         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 317         struct sadb_msg *hdr;
 318
 319         if (!skb)
 320                 return -ENOBUFS;
 321
 322         /* Woe be to the platform trying to support PFKEY yet
 323          * having normal errnos outside the 1-255 range, inclusive.
 324          */
 325         err = -err;
 326         if (err == ERESTARTSYS ||
 327             err == ERESTARTNOHAND ||
 328             err == ERESTARTNOINTR)
 329                 err = EINTR;
 330         if (err >= 512)
 331                 err = EINVAL;
 332         BUG_ON(err <= 0 || err >= 256);
 333
 334         hdr = skb_put(skb, sizeof(struct sadb_msg));
 335         pfkey_hdr_dup(hdr, orig);
 336         hdr->sadb_msg_errno = (uint8_t) err;
 337         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 338                              sizeof(uint64_t));
 339
 340         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 341
 342         return 0;
 343 }
 344
 345 static const u8 sadb_ext_min_len[] = {
 346         [SADB_EXT_RESERVED]             = (u8) 0,
 347         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 348         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 349         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 350         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 351         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 352         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 353         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 354         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 355         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 356         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 357         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 358         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 359         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 360         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 361         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 362         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 363         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 364         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 365         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 366         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 367         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 368         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 369         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 370         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 371         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 372         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 373 };
 374
 375 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 376 static int verify_address_len(const void *p)
 377 {
 378         const struct sadb_address *sp = p;
 379         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 380         const struct sockaddr_in *sin;
 381 #if IS_ENABLED(CONFIG_IPV6)
 382         const struct sockaddr_in6 *sin6;
 383 #endif
 384         int len;
 385
 386         if (sp->sadb_address_len <
 387             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 388                          sizeof(uint64_t)))
 389                 return -EINVAL;
 390
 391         switch (addr->sa_family) {
 392         case AF_INET:
 393                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 394                 if (sp->sadb_address_len != len ||
 395                     sp->sadb_address_prefixlen > 32)
 396                         return -EINVAL;
 397                 break;
 398 #if IS_ENABLED(CONFIG_IPV6)
 399         case AF_INET6:
 400                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 401                 if (sp->sadb_address_len != len ||
 402                     sp->sadb_address_prefixlen > 128)
 403                         return -EINVAL;
 404                 break;
 405 #endif
 406         default:
 407                 /* It is user using kernel to keep track of security
 408                  * associations for another protocol, such as
 409                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 410                  * lengths.
 411                  *
 412                  * XXX Actually, association/policy database is not yet
 413                  * XXX able to cope with arbitrary sockaddr families.
 414                  * XXX When it can, remove this -EINVAL.  -DaveM
 415                  */
 416                 return -EINVAL;
 417         }
 418
 419         return 0;
 420 }
 421
 422 static inline int sadb_key_len(const struct sadb_key *key)
 423 {
 424         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 425
 426         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 427                             sizeof(uint64_t));
 428 }
 429
 430 static int verify_key_len(const void *p)
 431 {
 432         const struct sadb_key *key = p;
 433
 434         if (sadb_key_len(key) > key->sadb_key_len)
 435                 return -EINVAL;
 436
 437         return 0;
 438 }
 439
 440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 441 {
 442         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 443                             sec_ctx->sadb_x_ctx_len,
 444                             sizeof(uint64_t));
 445 }
 446
 447 static inline int verify_sec_ctx_len(const void *p)
 448 {
 449         const struct sadb_x_sec_ctx *sec_ctx = p;
 450         int len = sec_ctx->sadb_x_ctx_len;
 451
 452         if (len > PAGE_SIZE)
 453                 return -EINVAL;
 454
 455         len = pfkey_sec_ctx_len(sec_ctx);
 456
 457         if (sec_ctx->sadb_x_sec_len != len)
 458                 return -EINVAL;
 459
 460         return 0;
 461 }
 462
 463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 464                                                                      gfp_t gfp)
 465 {
 466         struct xfrm_user_sec_ctx *uctx = NULL;
 467         int ctx_size = sec_ctx->sadb_x_ctx_len;
 468
 469         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 470
 471         if (!uctx)
 472                 return NULL;
 473
 474         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 475         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 476         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 477         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 478         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 479         memcpy(uctx + 1, sec_ctx + 1,
 480                uctx->ctx_len);
 481
 482         return uctx;
 483 }
 484
 485 static int present_and_same_family(const struct sadb_address *src,
 486                                    const struct sadb_address *dst)
 487 {
 488         const struct sockaddr *s_addr, *d_addr;
 489
 490         if (!src || !dst)
 491                 return 0;
 492
 493         s_addr = (const struct sockaddr *)(src + 1);
 494         d_addr = (const struct sockaddr *)(dst + 1);
 495         if (s_addr->sa_family != d_addr->sa_family)
 496                 return 0;
 497         if (s_addr->sa_family != AF_INET
 498 #if IS_ENABLED(CONFIG_IPV6)
 499             && s_addr->sa_family != AF_INET6
 500 #endif
 501                 )
 502                 return 0;
 503
 504         return 1;
 505 }
 506
 507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 508 {
 509         const char *p = (char *) hdr;
 510         int len = skb->len;
 511
 512         len -= sizeof(*hdr);
 513         p += sizeof(*hdr);
 514         while (len > 0) {
 515                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 516                 uint16_t ext_type;
 517                 int ext_len;
 518
 519                 if (len < sizeof(*ehdr))
 520                         return -EINVAL;
 521
 522                 ext_len  = ehdr->sadb_ext_len;
 523                 ext_len *= sizeof(uint64_t);
 524                 ext_type = ehdr->sadb_ext_type;
 525                 if (ext_len < sizeof(uint64_t) ||
 526                     ext_len > len ||
 527                     ext_type == SADB_EXT_RESERVED)
 528                         return -EINVAL;
 529
 530                 if (ext_type <= SADB_EXT_MAX) {
 531                         int min = (int) sadb_ext_min_len[ext_type];
 532                         if (ext_len < min)
 533                                 return -EINVAL;
 534                         if (ext_hdrs[ext_type-1] != NULL)
 535                                 return -EINVAL;
 536                         switch (ext_type) {
 537                         case SADB_EXT_ADDRESS_SRC:
 538                         case SADB_EXT_ADDRESS_DST:
 539                         case SADB_EXT_ADDRESS_PROXY:
 540                         case SADB_X_EXT_NAT_T_OA:
 541                                 if (verify_address_len(p))
 542                                         return -EINVAL;
 543                                 break;
 544                         case SADB_X_EXT_SEC_CTX:
 545                                 if (verify_sec_ctx_len(p))
 546                                         return -EINVAL;
 547                                 break;
 548                         case SADB_EXT_KEY_AUTH:
 549                         case SADB_EXT_KEY_ENCRYPT:
 550                                 if (verify_key_len(p))
 551                                         return -EINVAL;
 552                                 break;
 553                         default:
 554                                 break;
 555                         }
 556                         ext_hdrs[ext_type-1] = (void *) p;
 557                 }
 558                 p   += ext_len;
 559                 len -= ext_len;
 560         }
 561
 562         return 0;
 563 }
 564
 565 static uint16_t
 566 pfkey_satype2proto(uint8_t satype)
 567 {
 568         switch (satype) {
 569         case SADB_SATYPE_UNSPEC:
 570                 return IPSEC_PROTO_ANY;
 571         case SADB_SATYPE_AH:
 572                 return IPPROTO_AH;
 573         case SADB_SATYPE_ESP:
 574                 return IPPROTO_ESP;
 575         case SADB_X_SATYPE_IPCOMP:
 576                 return IPPROTO_COMP;
 577         default:
 578                 return 0;
 579         }
 580         /* NOTREACHED */
 581 }
 582
 583 static uint8_t
 584 pfkey_proto2satype(uint16_t proto)
 585 {
 586         switch (proto) {
 587         case IPPROTO_AH:
 588                 return SADB_SATYPE_AH;
 589         case IPPROTO_ESP:
 590                 return SADB_SATYPE_ESP;
 591         case IPPROTO_COMP:
 592                 return SADB_X_SATYPE_IPCOMP;
 593         default:
 594                 return 0;
 595         }
 596         /* NOTREACHED */
 597 }
 598
 599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 600  * say specifically 'just raw sockets' as we encode them as 255.
 601  */
 602
 603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 604 {
 605         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 606 }
 607
 608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 609 {
 610         return proto ? proto : IPSEC_PROTO_ANY;
 611 }
 612
 613 static inline int pfkey_sockaddr_len(sa_family_t family)
 614 {
 615         switch (family) {
 616         case AF_INET:
 617                 return sizeof(struct sockaddr_in);
 618 #if IS_ENABLED(CONFIG_IPV6)
 619         case AF_INET6:
 620                 return sizeof(struct sockaddr_in6);
 621 #endif
 622         }
 623         return 0;
 624 }
 625
 626 static
 627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 628 {
 629         switch (sa->sa_family) {
 630         case AF_INET:
 631                 xaddr->a4 =
 632                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 633                 return AF_INET;
 634 #if IS_ENABLED(CONFIG_IPV6)
 635         case AF_INET6:
 636                 memcpy(xaddr->a6,
 637                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 638                        sizeof(struct in6_addr));
 639                 return AF_INET6;
 640 #endif
 641         }
 642         return 0;
 643 }
 644
 645 static
 646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 647 {
 648         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 649                                       xaddr);
 650 }
 651
 652 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 653 {
 654         const struct sadb_sa *sa;
 655         const struct sadb_address *addr;
 656         uint16_t proto;
 657         unsigned short family;
 658         xfrm_address_t *xaddr;
 659
 660         sa = ext_hdrs[SADB_EXT_SA - 1];
 661         if (sa == NULL)
 662                 return NULL;
 663
 664         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 665         if (proto == 0)
 666                 return NULL;
 667
 668         /* sadb_address_len should be checked by caller */
 669         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 670         if (addr == NULL)
 671                 return NULL;
 672
 673         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 674         switch (family) {
 675         case AF_INET:
 676                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 677                 break;
 678 #if IS_ENABLED(CONFIG_IPV6)
 679         case AF_INET6:
 680                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 681                 break;
 682 #endif
 683         default:
 684                 xaddr = NULL;
 685         }
 686
 687         if (!xaddr)
 688                 return NULL;
 689
 690         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 691 }
 692
 693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 694
 695 static int
 696 pfkey_sockaddr_size(sa_family_t family)
 697 {
 698         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 699 }
 700
 701 static inline int pfkey_mode_from_xfrm(int mode)
 702 {
 703         switch(mode) {
 704         case XFRM_MODE_TRANSPORT:
 705                 return IPSEC_MODE_TRANSPORT;
 706         case XFRM_MODE_TUNNEL:
 707                 return IPSEC_MODE_TUNNEL;
 708         case XFRM_MODE_BEET:
 709                 return IPSEC_MODE_BEET;
 710         default:
 711                 return -1;
 712         }
 713 }
 714
 715 static inline int pfkey_mode_to_xfrm(int mode)
 716 {
 717         switch(mode) {
 718         case IPSEC_MODE_ANY:    /*XXX*/
 719         case IPSEC_MODE_TRANSPORT:
 720                 return XFRM_MODE_TRANSPORT;
 721         case IPSEC_MODE_TUNNEL:
 722                 return XFRM_MODE_TUNNEL;
 723         case IPSEC_MODE_BEET:
 724                 return XFRM_MODE_BEET;
 725         default:
 726                 return -1;
 727         }
 728 }
 729
 730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 731                                         struct sockaddr *sa,
 732                                         unsigned short family)
 733 {
 734         switch (family) {
 735         case AF_INET:
 736             {
 737                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 738                 sin->sin_family = AF_INET;
 739                 sin->sin_port = port;
 740                 sin->sin_addr.s_addr = xaddr->a4;
 741                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 742                 return 32;
 743             }
 744 #if IS_ENABLED(CONFIG_IPV6)
 745         case AF_INET6:
 746             {
 747                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 748                 sin6->sin6_family = AF_INET6;
 749                 sin6->sin6_port = port;
 750                 sin6->sin6_flowinfo = 0;
 751                 sin6->sin6_addr = xaddr->in6;
 752                 sin6->sin6_scope_id = 0;
 753                 return 128;
 754             }
 755 #endif
 756         }
 757         return 0;
 758 }
 759
 760 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 761                                               int add_keys, int hsc)
 762 {
 763         struct sk_buff *skb;
 764         struct sadb_msg *hdr;
 765         struct sadb_sa *sa;
 766         struct sadb_lifetime *lifetime;
 767         struct sadb_address *addr;
 768         struct sadb_key *key;
 769         struct sadb_x_sa2 *sa2;
 770         struct sadb_x_sec_ctx *sec_ctx;
 771         struct xfrm_sec_ctx *xfrm_ctx;
 772         int ctx_size = 0;
 773         int size;
 774         int auth_key_size = 0;
 775         int encrypt_key_size = 0;
 776         int sockaddr_size;
 777         struct xfrm_encap_tmpl *natt = NULL;
 778         int mode;
 779
 780         /* address family check */
 781         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 782         if (!sockaddr_size)
 783                 return ERR_PTR(-EINVAL);
 784
 785         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 786            key(AE), (identity(SD),) (sensitivity)> */
 787         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 788                 sizeof(struct sadb_lifetime) +
 789                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 790                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 791                         sizeof(struct sadb_address)*2 +
 792                                 sockaddr_size*2 +
 793                                         sizeof(struct sadb_x_sa2);
 794
 795         if ((xfrm_ctx = x->security)) {
 796                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 797                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 798         }
 799
 800         /* identity & sensitivity */
 801         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 802                 size += sizeof(struct sadb_address) + sockaddr_size;
 803
 804         if (add_keys) {
 805                 if (x->aalg && x->aalg->alg_key_len) {
 806                         auth_key_size =
 807                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 808                         size += sizeof(struct sadb_key) + auth_key_size;
 809                 }
 810                 if (x->ealg && x->ealg->alg_key_len) {
 811                         encrypt_key_size =
 812                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 813                         size += sizeof(struct sadb_key) + encrypt_key_size;
 814                 }
 815         }
 816         if (x->encap)
 817                 natt = x->encap;
 818
 819         if (natt && natt->encap_type) {
 820                 size += sizeof(struct sadb_x_nat_t_type);
 821                 size += sizeof(struct sadb_x_nat_t_port);
 822                 size += sizeof(struct sadb_x_nat_t_port);
 823         }
 824
 825         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 826         if (skb == NULL)
 827                 return ERR_PTR(-ENOBUFS);
 828
 829         /* call should fill header later */
 830         hdr = skb_put(skb, sizeof(struct sadb_msg));
 831         memset(hdr, 0, size);   /* XXX do we need this ? */
 832         hdr->sadb_msg_len = size / sizeof(uint64_t);
 833
 834         /* sa */
 835         sa = skb_put(skb, sizeof(struct sadb_sa));
 836         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 837         sa->sadb_sa_exttype = SADB_EXT_SA;
 838         sa->sadb_sa_spi = x->id.spi;
 839         sa->sadb_sa_replay = x->props.replay_window;
 840         switch (x->km.state) {
 841         case XFRM_STATE_VALID:
 842                 sa->sadb_sa_state = x->km.dying ?
 843                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 844                 break;
 845         case XFRM_STATE_ACQ:
 846                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 847                 break;
 848         default:
 849                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 850                 break;
 851         }
 852         sa->sadb_sa_auth = 0;
 853         if (x->aalg) {
 854                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 855                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 856                                         a->desc.sadb_alg_id : 0;
 857         }
 858         sa->sadb_sa_encrypt = 0;
 859         BUG_ON(x->ealg && x->calg);
 860         if (x->ealg) {
 861                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 862                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 863                                         a->desc.sadb_alg_id : 0;
 864         }
 865         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 866         if (x->calg) {
 867                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 868                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 869                                         a->desc.sadb_alg_id : 0;
 870         }
 871
 872         sa->sadb_sa_flags = 0;
 873         if (x->props.flags & XFRM_STATE_NOECN)
 874                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 875         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 876                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 877         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 878                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 879
 880         /* hard time */
 881         if (hsc & 2) {
 882                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 883                 lifetime->sadb_lifetime_len =
 884                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 885                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 886                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 887                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 888                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 889                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 890         }
 891         /* soft time */
 892         if (hsc & 1) {
 893                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 894                 lifetime->sadb_lifetime_len =
 895                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 896                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 897                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 898                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 899                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 900                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 901         }
 902         /* current time */
 903         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 904         lifetime->sadb_lifetime_len =
 905                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 906         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 907         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 908         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 909         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 910         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 911         /* src address */
 912         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 913         addr->sadb_address_len =
 914                 (sizeof(struct sadb_address)+sockaddr_size)/
 915                         sizeof(uint64_t);
 916         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 917         /* "if the ports are non-zero, then the sadb_address_proto field,
 918            normally zero, MUST be filled in with the transport
 919            protocol's number." - RFC2367 */
 920         addr->sadb_address_proto = 0;
 921         addr->sadb_address_reserved = 0;
 922
 923         addr->sadb_address_prefixlen =
 924                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 925                                     (struct sockaddr *) (addr + 1),
 926                                     x->props.family);
 927         BUG_ON(!addr->sadb_address_prefixlen);
 928
 929         /* dst address */
 930         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 931         addr->sadb_address_len =
 932                 (sizeof(struct sadb_address)+sockaddr_size)/
 933                         sizeof(uint64_t);
 934         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 935         addr->sadb_address_proto = 0;
 936         addr->sadb_address_reserved = 0;
 937
 938         addr->sadb_address_prefixlen =
 939                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 940                                     (struct sockaddr *) (addr + 1),
 941                                     x->props.family);
 942         BUG_ON(!addr->sadb_address_prefixlen);
 943
 944         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 945                              x->props.family)) {
 946                 addr = skb_put(skb,
 947                                sizeof(struct sadb_address) + sockaddr_size);
 948                 addr->sadb_address_len =
 949                         (sizeof(struct sadb_address)+sockaddr_size)/
 950                         sizeof(uint64_t);
 951                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 952                 addr->sadb_address_proto =
 953                         pfkey_proto_from_xfrm(x->sel.proto);
 954                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 955                 addr->sadb_address_reserved = 0;
 956
 957                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 958                                     (struct sockaddr *) (addr + 1),
 959                                     x->props.family);
 960         }
 961
 962         /* auth key */
 963         if (add_keys && auth_key_size) {
 964                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 965                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 966                         sizeof(uint64_t);
 967                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 968                 key->sadb_key_bits = x->aalg->alg_key_len;
 969                 key->sadb_key_reserved = 0;
 970                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 971         }
 972         /* encrypt key */
 973         if (add_keys && encrypt_key_size) {
 974                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 975                 key->sadb_key_len = (sizeof(struct sadb_key) +
 976                                      encrypt_key_size) / sizeof(uint64_t);
 977                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 978                 key->sadb_key_bits = x->ealg->alg_key_len;
 979                 key->sadb_key_reserved = 0;
 980                 memcpy(key + 1, x->ealg->alg_key,
 981                        (x->ealg->alg_key_len+7)/8);
 982         }
 983
 984         /* sa */
 985         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 986         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 987         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 988         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 989                 kfree_skb(skb);
 990                 return ERR_PTR(-EINVAL);
 991         }
 992         sa2->sadb_x_sa2_mode = mode;
 993         sa2->sadb_x_sa2_reserved1 = 0;
 994         sa2->sadb_x_sa2_reserved2 = 0;
 995         sa2->sadb_x_sa2_sequence = 0;
 996         sa2->sadb_x_sa2_reqid = x->props.reqid;
 997
 998         if (natt && natt->encap_type) {
 999                 struct sadb_x_nat_t_type *n_type;
1000                 struct sadb_x_nat_t_port *n_port;
1001
1002                 /* type */
1003                 n_type = skb_put(skb, sizeof(*n_type));
1004                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1005                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1006                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1007                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1008                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1009                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1010
1011                 /* source port */
1012                 n_port = skb_put(skb, sizeof(*n_port));
1013                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1014                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1015                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1016                 n_port->sadb_x_nat_t_port_reserved = 0;
1017
1018                 /* dest port */
1019                 n_port = skb_put(skb, sizeof(*n_port));
1020                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1021                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1022                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1023                 n_port->sadb_x_nat_t_port_reserved = 0;
1024         }
1025
1026         /* security context */
1027         if (xfrm_ctx) {
1028                 sec_ctx = skb_put(skb,
1029                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1030                 sec_ctx->sadb_x_sec_len =
1031                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1032                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1033                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1034                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1035                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1036                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1037                        xfrm_ctx->ctx_len);
1038         }
1039
1040         return skb;
1041 }
1042
1043
1044 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1045 {
1046         struct sk_buff *skb;
1047
1048         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1049
1050         return skb;
1051 }
1052
1053 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1054                                                           int hsc)
1055 {
1056         return __pfkey_xfrm_state2msg(x, 0, hsc);
1057 }
1058
1059 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1060                                                 const struct sadb_msg *hdr,
1061                                                 void * const *ext_hdrs)
1062 {
1063         struct xfrm_state *x;
1064         const struct sadb_lifetime *lifetime;
1065         const struct sadb_sa *sa;
1066         const struct sadb_key *key;
1067         const struct sadb_x_sec_ctx *sec_ctx;
1068         uint16_t proto;
1069         int err;
1070
1071
1072         sa = ext_hdrs[SADB_EXT_SA - 1];
1073         if (!sa ||
1074             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076                 return ERR_PTR(-EINVAL);
1077         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079                 return ERR_PTR(-EINVAL);
1080         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082                 return ERR_PTR(-EINVAL);
1083         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085                 return ERR_PTR(-EINVAL);
1086
1087         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088         if (proto == 0)
1089                 return ERR_PTR(-EINVAL);
1090
1091         /* default error is no buffer space */
1092         err = -ENOBUFS;
1093
1094         /* RFC2367:
1095
1096    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1097    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1098    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1099    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1100    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1101    not true.
1102
1103            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1104            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1105          */
1106         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1107             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1108              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1109             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1110                 return ERR_PTR(-EINVAL);
1111         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1112         if (key != NULL &&
1113             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1114             key->sadb_key_bits == 0)
1115                 return ERR_PTR(-EINVAL);
1116         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1117         if (key != NULL &&
1118             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1119             key->sadb_key_bits == 0)
1120                 return ERR_PTR(-EINVAL);
1121
1122         x = xfrm_state_alloc(net);
1123         if (x == NULL)
1124                 return ERR_PTR(-ENOBUFS);
1125
1126         x->id.proto = proto;
1127         x->id.spi = sa->sadb_sa_spi;
1128         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1129                                         (sizeof(x->replay.bitmap) * 8));
1130         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1131                 x->props.flags |= XFRM_STATE_NOECN;
1132         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1133                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1134         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1135                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1136
1137         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1138         if (lifetime != NULL) {
1139                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1140                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1141                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1142                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1143         }
1144         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1145         if (lifetime != NULL) {
1146                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1147                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1148                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1149                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1150         }
1151
1152         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1153         if (sec_ctx != NULL) {
1154                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1155
1156                 if (!uctx)
1157                         goto out;
1158
1159                 err = security_xfrm_state_alloc(x, uctx);
1160                 kfree(uctx);
1161
1162                 if (err)
1163                         goto out;
1164         }
1165
1166         err = -ENOBUFS;
1167         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1168         if (sa->sadb_sa_auth) {
1169                 int keysize = 0;
1170                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1171                 if (!a || !a->pfkey_supported) {
1172                         err = -ENOSYS;
1173                         goto out;
1174                 }
1175                 if (key)
1176                         keysize = (key->sadb_key_bits + 7) / 8;
1177                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1178                 if (!x->aalg) {
1179                         err = -ENOMEM;
1180                         goto out;
1181                 }
1182                 strcpy(x->aalg->alg_name, a->name);
1183                 x->aalg->alg_key_len = 0;
1184                 if (key) {
1185                         x->aalg->alg_key_len = key->sadb_key_bits;
1186                         memcpy(x->aalg->alg_key, key+1, keysize);
1187                 }
1188                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1189                 x->props.aalgo = sa->sadb_sa_auth;
1190                 /* x->algo.flags = sa->sadb_sa_flags; */
1191         }
1192         if (sa->sadb_sa_encrypt) {
1193                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1194                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1195                         if (!a || !a->pfkey_supported) {
1196                                 err = -ENOSYS;
1197                                 goto out;
1198                         }
1199                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1200                         if (!x->calg) {
1201                                 err = -ENOMEM;
1202                                 goto out;
1203                         }
1204                         strcpy(x->calg->alg_name, a->name);
1205                         x->props.calgo = sa->sadb_sa_encrypt;
1206                 } else {
1207                         int keysize = 0;
1208                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1209                         if (!a || !a->pfkey_supported) {
1210                                 err = -ENOSYS;
1211                                 goto out;
1212                         }
1213                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1214                         if (key)
1215                                 keysize = (key->sadb_key_bits + 7) / 8;
1216                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1217                         if (!x->ealg) {
1218                                 err = -ENOMEM;
1219                                 goto out;
1220                         }
1221                         strcpy(x->ealg->alg_name, a->name);
1222                         x->ealg->alg_key_len = 0;
1223                         if (key) {
1224                                 x->ealg->alg_key_len = key->sadb_key_bits;
1225                                 memcpy(x->ealg->alg_key, key+1, keysize);
1226                         }
1227                         x->props.ealgo = sa->sadb_sa_encrypt;
1228                         x->geniv = a->uinfo.encr.geniv;
1229                 }
1230         }
1231         /* x->algo.flags = sa->sadb_sa_flags; */
1232
1233         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1234                                                     &x->props.saddr);
1235         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1236                                   &x->id.daddr);
1237
1238         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1239                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1240                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241                 if (mode < 0) {
1242                         err = -EINVAL;
1243                         goto out;
1244                 }
1245                 x->props.mode = mode;
1246                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1247         }
1248
1249         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1250                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1251
1252                 /* Nobody uses this, but we try. */
1253                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255         }
1256
1257         if (!x->sel.family)
1258                 x->sel.family = x->props.family;
1259
1260         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1261                 const struct sadb_x_nat_t_type* n_type;
1262                 struct xfrm_encap_tmpl *natt;
1263
1264                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1265                 if (!x->encap) {
1266                         err = -ENOMEM;
1267                         goto out;
1268                 }
1269
1270                 natt = x->encap;
1271                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1272                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1273
1274                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1275                         const struct sadb_x_nat_t_port *n_port =
1276                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1277                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1278                 }
1279                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1280                         const struct sadb_x_nat_t_port *n_port =
1281                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283                 }
1284                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1285         }
1286
1287         err = xfrm_init_state(x);
1288         if (err)
1289                 goto out;
1290
1291         x->km.seq = hdr->sadb_msg_seq;
1292         return x;
1293
1294 out:
1295         x->km.state = XFRM_STATE_DEAD;
1296         xfrm_state_put(x);
1297         return ERR_PTR(err);
1298 }
1299
1300 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1301 {
1302         return -EOPNOTSUPP;
1303 }
1304
1305 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1306 {
1307         struct net *net = sock_net(sk);
1308         struct sk_buff *resp_skb;
1309         struct sadb_x_sa2 *sa2;
1310         struct sadb_address *saddr, *daddr;
1311         struct sadb_msg *out_hdr;
1312         struct sadb_spirange *range;
1313         struct xfrm_state *x = NULL;
1314         int mode;
1315         int err;
1316         u32 min_spi, max_spi;
1317         u32 reqid;
1318         u8 proto;
1319         unsigned short family;
1320         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1321
1322         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1323                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1324                 return -EINVAL;
1325
1326         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1327         if (proto == 0)
1328                 return -EINVAL;
1329
1330         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1331                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1332                 if (mode < 0)
1333                         return -EINVAL;
1334                 reqid = sa2->sadb_x_sa2_reqid;
1335         } else {
1336                 mode = 0;
1337                 reqid = 0;
1338         }
1339
1340         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1341         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1342
1343         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1344         switch (family) {
1345         case AF_INET:
1346                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1347                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1348                 break;
1349 #if IS_ENABLED(CONFIG_IPV6)
1350         case AF_INET6:
1351                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1352                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1353                 break;
1354 #endif
1355         }
1356
1357         if (hdr->sadb_msg_seq) {
1358                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1359                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1360                         xfrm_state_put(x);
1361                         x = NULL;
1362                 }
1363         }
1364
1365         if (!x)
1366                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1367
1368         if (x == NULL)
1369                 return -ENOENT;
1370
1371         min_spi = 0x100;
1372         max_spi = 0x0fffffff;
1373
1374         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1375         if (range) {
1376                 min_spi = range->sadb_spirange_min;
1377                 max_spi = range->sadb_spirange_max;
1378         }
1379
1380         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1381         if (err) {
1382                 xfrm_state_put(x);
1383                 return err;
1384         }
1385
1386         err = xfrm_alloc_spi(x, min_spi, max_spi);
1387         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1388
1389         if (IS_ERR(resp_skb)) {
1390                 xfrm_state_put(x);
1391                 return  PTR_ERR(resp_skb);
1392         }
1393
1394         out_hdr = (struct sadb_msg *) resp_skb->data;
1395         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1396         out_hdr->sadb_msg_type = SADB_GETSPI;
1397         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1398         out_hdr->sadb_msg_errno = 0;
1399         out_hdr->sadb_msg_reserved = 0;
1400         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1401         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1402
1403         xfrm_state_put(x);
1404
1405         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1406
1407         return 0;
1408 }
1409
1410 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1411 {
1412         struct net *net = sock_net(sk);
1413         struct xfrm_state *x;
1414
1415         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1416                 return -EOPNOTSUPP;
1417
1418         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1419                 return 0;
1420
1421         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1422         if (x == NULL)
1423                 return 0;
1424
1425         spin_lock_bh(&x->lock);
1426         if (x->km.state == XFRM_STATE_ACQ)
1427                 x->km.state = XFRM_STATE_ERROR;
1428
1429         spin_unlock_bh(&x->lock);
1430         xfrm_state_put(x);
1431         return 0;
1432 }
1433
1434 static inline int event2poltype(int event)
1435 {
1436         switch (event) {
1437         case XFRM_MSG_DELPOLICY:
1438                 return SADB_X_SPDDELETE;
1439         case XFRM_MSG_NEWPOLICY:
1440                 return SADB_X_SPDADD;
1441         case XFRM_MSG_UPDPOLICY:
1442                 return SADB_X_SPDUPDATE;
1443         case XFRM_MSG_POLEXPIRE:
1444         //      return SADB_X_SPDEXPIRE;
1445         default:
1446                 pr_err("pfkey: Unknown policy event %d\n", event);
1447                 break;
1448         }
1449
1450         return 0;
1451 }
1452
1453 static inline int event2keytype(int event)
1454 {
1455         switch (event) {
1456         case XFRM_MSG_DELSA:
1457                 return SADB_DELETE;
1458         case XFRM_MSG_NEWSA:
1459                 return SADB_ADD;
1460         case XFRM_MSG_UPDSA:
1461                 return SADB_UPDATE;
1462         case XFRM_MSG_EXPIRE:
1463                 return SADB_EXPIRE;
1464         default:
1465                 pr_err("pfkey: Unknown SA event %d\n", event);
1466                 break;
1467         }
1468
1469         return 0;
1470 }
1471
1472 /* ADD/UPD/DEL */
1473 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1474 {
1475         struct sk_buff *skb;
1476         struct sadb_msg *hdr;
1477
1478         skb = pfkey_xfrm_state2msg(x);
1479
1480         if (IS_ERR(skb))
1481                 return PTR_ERR(skb);
1482
1483         hdr = (struct sadb_msg *) skb->data;
1484         hdr->sadb_msg_version = PF_KEY_V2;
1485         hdr->sadb_msg_type = event2keytype(c->event);
1486         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1487         hdr->sadb_msg_errno = 0;
1488         hdr->sadb_msg_reserved = 0;
1489         hdr->sadb_msg_seq = c->seq;
1490         hdr->sadb_msg_pid = c->portid;
1491
1492         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1493
1494         return 0;
1495 }
1496
1497 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499         struct net *net = sock_net(sk);
1500         struct xfrm_state *x;
1501         int err;
1502         struct km_event c;
1503
1504         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1505         if (IS_ERR(x))
1506                 return PTR_ERR(x);
1507
1508         xfrm_state_hold(x);
1509         if (hdr->sadb_msg_type == SADB_ADD)
1510                 err = xfrm_state_add(x);
1511         else
1512                 err = xfrm_state_update(x);
1513
1514         xfrm_audit_state_add(x, err ? 0 : 1, true);
1515
1516         if (err < 0) {
1517                 x->km.state = XFRM_STATE_DEAD;
1518                 __xfrm_state_put(x);
1519                 goto out;
1520         }
1521
1522         if (hdr->sadb_msg_type == SADB_ADD)
1523                 c.event = XFRM_MSG_NEWSA;
1524         else
1525                 c.event = XFRM_MSG_UPDSA;
1526         c.seq = hdr->sadb_msg_seq;
1527         c.portid = hdr->sadb_msg_pid;
1528         km_state_notify(x, &c);
1529 out:
1530         xfrm_state_put(x);
1531         return err;
1532 }
1533
1534 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1535 {
1536         struct net *net = sock_net(sk);
1537         struct xfrm_state *x;
1538         struct km_event c;
1539         int err;
1540
1541         if (!ext_hdrs[SADB_EXT_SA-1] ||
1542             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1543                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1544                 return -EINVAL;
1545
1546         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1547         if (x == NULL)
1548                 return -ESRCH;
1549
1550         if ((err = security_xfrm_state_delete(x)))
1551                 goto out;
1552
1553         if (xfrm_state_kern(x)) {
1554                 err = -EPERM;
1555                 goto out;
1556         }
1557
1558         err = xfrm_state_delete(x);
1559
1560         if (err < 0)
1561                 goto out;
1562
1563         c.seq = hdr->sadb_msg_seq;
1564         c.portid = hdr->sadb_msg_pid;
1565         c.event = XFRM_MSG_DELSA;
1566         km_state_notify(x, &c);
1567 out:
1568         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1569         xfrm_state_put(x);
1570
1571         return err;
1572 }
1573
1574 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1575 {
1576         struct net *net = sock_net(sk);
1577         __u8 proto;
1578         struct sk_buff *out_skb;
1579         struct sadb_msg *out_hdr;
1580         struct xfrm_state *x;
1581
1582         if (!ext_hdrs[SADB_EXT_SA-1] ||
1583             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1584                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1585                 return -EINVAL;
1586
1587         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1588         if (x == NULL)
1589                 return -ESRCH;
1590
1591         out_skb = pfkey_xfrm_state2msg(x);
1592         proto = x->id.proto;
1593         xfrm_state_put(x);
1594         if (IS_ERR(out_skb))
1595                 return  PTR_ERR(out_skb);
1596
1597         out_hdr = (struct sadb_msg *) out_skb->data;
1598         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1599         out_hdr->sadb_msg_type = SADB_GET;
1600         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1601         out_hdr->sadb_msg_errno = 0;
1602         out_hdr->sadb_msg_reserved = 0;
1603         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1604         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1605         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1606
1607         return 0;
1608 }
1609
1610 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1611                                               gfp_t allocation)
1612 {
1613         struct sk_buff *skb;
1614         struct sadb_msg *hdr;
1615         int len, auth_len, enc_len, i;
1616
1617         auth_len = xfrm_count_pfkey_auth_supported();
1618         if (auth_len) {
1619                 auth_len *= sizeof(struct sadb_alg);
1620                 auth_len += sizeof(struct sadb_supported);
1621         }
1622
1623         enc_len = xfrm_count_pfkey_enc_supported();
1624         if (enc_len) {
1625                 enc_len *= sizeof(struct sadb_alg);
1626                 enc_len += sizeof(struct sadb_supported);
1627         }
1628
1629         len = enc_len + auth_len + sizeof(struct sadb_msg);
1630
1631         skb = alloc_skb(len + 16, allocation);
1632         if (!skb)
1633                 goto out_put_algs;
1634
1635         hdr = skb_put(skb, sizeof(*hdr));
1636         pfkey_hdr_dup(hdr, orig);
1637         hdr->sadb_msg_errno = 0;
1638         hdr->sadb_msg_len = len / sizeof(uint64_t);
1639
1640         if (auth_len) {
1641                 struct sadb_supported *sp;
1642                 struct sadb_alg *ap;
1643
1644                 sp = skb_put(skb, auth_len);
1645                 ap = (struct sadb_alg *) (sp + 1);
1646
1647                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1648                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1649
1650                 for (i = 0; ; i++) {
1651                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1652                         if (!aalg)
1653                                 break;
1654                         if (!aalg->pfkey_supported)
1655                                 continue;
1656                         if (aalg->available)
1657                                 *ap++ = aalg->desc;
1658                 }
1659         }
1660
1661         if (enc_len) {
1662                 struct sadb_supported *sp;
1663                 struct sadb_alg *ap;
1664
1665                 sp = skb_put(skb, enc_len);
1666                 ap = (struct sadb_alg *) (sp + 1);
1667
1668                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1669                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1670
1671                 for (i = 0; ; i++) {
1672                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1673                         if (!ealg)
1674                                 break;
1675                         if (!ealg->pfkey_supported)
1676                                 continue;
1677                         if (ealg->available)
1678                                 *ap++ = ealg->desc;
1679                 }
1680         }
1681
1682 out_put_algs:
1683         return skb;
1684 }
1685
1686 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1687 {
1688         struct pfkey_sock *pfk = pfkey_sk(sk);
1689         struct sk_buff *supp_skb;
1690
1691         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1692                 return -EINVAL;
1693
1694         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1695                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1696                         return -EEXIST;
1697                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1698         }
1699
1700         xfrm_probe_algs();
1701
1702         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1703         if (!supp_skb) {
1704                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1705                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1706
1707                 return -ENOBUFS;
1708         }
1709
1710         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1711                         sock_net(sk));
1712         return 0;
1713 }
1714
1715 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1716 {
1717         struct sk_buff *skb;
1718         struct sadb_msg *hdr;
1719
1720         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1721         if (!skb)
1722                 return -ENOBUFS;
1723
1724         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1725         hdr->sadb_msg_errno = (uint8_t) 0;
1726         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1727
1728         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1729                                sock_net(sk));
1730 }
1731
1732 static int key_notify_sa_flush(const struct km_event *c)
1733 {
1734         struct sk_buff *skb;
1735         struct sadb_msg *hdr;
1736
1737         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1738         if (!skb)
1739                 return -ENOBUFS;
1740         hdr = skb_put(skb, sizeof(struct sadb_msg));
1741         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1742         hdr->sadb_msg_type = SADB_FLUSH;
1743         hdr->sadb_msg_seq = c->seq;
1744         hdr->sadb_msg_pid = c->portid;
1745         hdr->sadb_msg_version = PF_KEY_V2;
1746         hdr->sadb_msg_errno = (uint8_t) 0;
1747         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1748         hdr->sadb_msg_reserved = 0;
1749
1750         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1751
1752         return 0;
1753 }
1754
1755 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1756 {
1757         struct net *net = sock_net(sk);
1758         unsigned int proto;
1759         struct km_event c;
1760         int err, err2;
1761
1762         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1763         if (proto == 0)
1764                 return -EINVAL;
1765
1766         err = xfrm_state_flush(net, proto, true, false);
1767         err2 = unicast_flush_resp(sk, hdr);
1768         if (err || err2) {
1769                 if (err == -ESRCH) /* empty table - go quietly */
1770                         err = 0;
1771                 return err ? err : err2;
1772         }
1773
1774         c.data.proto = proto;
1775         c.seq = hdr->sadb_msg_seq;
1776         c.portid = hdr->sadb_msg_pid;
1777         c.event = XFRM_MSG_FLUSHSA;
1778         c.net = net;
1779         km_state_notify(NULL, &c);
1780
1781         return 0;
1782 }
1783
1784 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1785 {
1786         struct pfkey_sock *pfk = ptr;
1787         struct sk_buff *out_skb;
1788         struct sadb_msg *out_hdr;
1789
1790         if (!pfkey_can_dump(&pfk->sk))
1791                 return -ENOBUFS;
1792
1793         out_skb = pfkey_xfrm_state2msg(x);
1794         if (IS_ERR(out_skb))
1795                 return PTR_ERR(out_skb);
1796
1797         out_hdr = (struct sadb_msg *) out_skb->data;
1798         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1799         out_hdr->sadb_msg_type = SADB_DUMP;
1800         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1801         out_hdr->sadb_msg_errno = 0;
1802         out_hdr->sadb_msg_reserved = 0;
1803         out_hdr->sadb_msg_seq = count + 1;
1804         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1805
1806         if (pfk->dump.skb)
1807                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1808                                 &pfk->sk, sock_net(&pfk->sk));
1809         pfk->dump.skb = out_skb;
1810
1811         return 0;
1812 }
1813
1814 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1815 {
1816         struct net *net = sock_net(&pfk->sk);
1817         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1818 }
1819
1820 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1821 {
1822         struct net *net = sock_net(&pfk->sk);
1823
1824         xfrm_state_walk_done(&pfk->dump.u.state, net);
1825 }
1826
1827 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1828 {
1829         u8 proto;
1830         struct xfrm_address_filter *filter = NULL;
1831         struct pfkey_sock *pfk = pfkey_sk(sk);
1832
1833         mutex_lock(&pfk->dump_lock);
1834         if (pfk->dump.dump != NULL) {
1835                 mutex_unlock(&pfk->dump_lock);
1836                 return -EBUSY;
1837         }
1838
1839         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1840         if (proto == 0) {
1841                 mutex_unlock(&pfk->dump_lock);
1842                 return -EINVAL;
1843         }
1844
1845         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1846                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1847
1848                 if ((xfilter->sadb_x_filter_splen >=
1849                         (sizeof(xfrm_address_t) << 3)) ||
1850                     (xfilter->sadb_x_filter_dplen >=
1851                         (sizeof(xfrm_address_t) << 3))) {
1852                         mutex_unlock(&pfk->dump_lock);
1853                         return -EINVAL;
1854                 }
1855                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1856                 if (filter == NULL) {
1857                         mutex_unlock(&pfk->dump_lock);
1858                         return -ENOMEM;
1859                 }
1860
1861                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1862                        sizeof(xfrm_address_t));
1863                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1864                        sizeof(xfrm_address_t));
1865                 filter->family = xfilter->sadb_x_filter_family;
1866                 filter->splen = xfilter->sadb_x_filter_splen;
1867                 filter->dplen = xfilter->sadb_x_filter_dplen;
1868         }
1869
1870         pfk->dump.msg_version = hdr->sadb_msg_version;
1871         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1872         pfk->dump.dump = pfkey_dump_sa;
1873         pfk->dump.done = pfkey_dump_sa_done;
1874         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1875         mutex_unlock(&pfk->dump_lock);
1876
1877         return pfkey_do_dump(pfk);
1878 }
1879
1880 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1881 {
1882         struct pfkey_sock *pfk = pfkey_sk(sk);
1883         int satype = hdr->sadb_msg_satype;
1884         bool reset_errno = false;
1885
1886         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1887                 reset_errno = true;
1888                 if (satype != 0 && satype != 1)
1889                         return -EINVAL;
1890                 pfk->promisc = satype;
1891         }
1892         if (reset_errno && skb_cloned(skb))
1893                 skb = skb_copy(skb, GFP_KERNEL);
1894         else
1895                 skb = skb_clone(skb, GFP_KERNEL);
1896
1897         if (reset_errno && skb) {
1898                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1899                 new_hdr->sadb_msg_errno = 0;
1900         }
1901
1902         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1903         return 0;
1904 }
1905
1906 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1907 {
1908         int i;
1909         u32 reqid = *(u32*)ptr;
1910
1911         for (i=0; i<xp->xfrm_nr; i++) {
1912                 if (xp->xfrm_vec[i].reqid == reqid)
1913                         return -EEXIST;
1914         }
1915         return 0;
1916 }
1917
1918 static u32 gen_reqid(struct net *net)
1919 {
1920         struct xfrm_policy_walk walk;
1921         u32 start;
1922         int rc;
1923         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1924
1925         start = reqid;
1926         do {
1927                 ++reqid;
1928                 if (reqid == 0)
1929                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1930                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1931                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1932                 xfrm_policy_walk_done(&walk, net);
1933                 if (rc != -EEXIST)
1934                         return reqid;
1935         } while (reqid != start);
1936         return 0;
1937 }
1938
1939 static int
1940 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1941 {
1942         struct net *net = xp_net(xp);
1943         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1944         int mode;
1945
1946         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1947                 return -ELOOP;
1948
1949         if (rq->sadb_x_ipsecrequest_mode == 0)
1950                 return -EINVAL;
1951         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1952                 return -EINVAL;
1953
1954         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1955         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1956                 return -EINVAL;
1957         t->mode = mode;
1958         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1959                 t->optional = 1;
1960         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1961                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1962                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1963                         t->reqid = 0;
1964                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1965                         return -ENOBUFS;
1966         }
1967
1968         /* addresses present only in tunnel mode */
1969         if (t->mode == XFRM_MODE_TUNNEL) {
1970                 int err;
1971
1972                 err = parse_sockaddr_pair(
1973                         (struct sockaddr *)(rq + 1),
1974                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1975                         &t->saddr, &t->id.daddr, &t->encap_family);
1976                 if (err)
1977                         return err;
1978         } else
1979                 t->encap_family = xp->family;
1980
1981         /* No way to set this via kame pfkey */
1982         t->allalgs = 1;
1983         xp->xfrm_nr++;
1984         return 0;
1985 }
1986
1987 static int
1988 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1989 {
1990         int err;
1991         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1992         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1993
1994         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1995                 return -EINVAL;
1996
1997         while (len >= sizeof(*rq)) {
1998                 if (len < rq->sadb_x_ipsecrequest_len ||
1999                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2000                         return -EINVAL;
2001
2002                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2003                         return err;
2004                 len -= rq->sadb_x_ipsecrequest_len;
2005                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2006         }
2007         return 0;
2008 }
2009
2010 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2011 {
2012         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2013
2014         if (xfrm_ctx) {
2015                 int len = sizeof(struct sadb_x_sec_ctx);
2016                 len += xfrm_ctx->ctx_len;
2017                 return PFKEY_ALIGN8(len);
2018         }
2019         return 0;
2020 }
2021
2022 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2023 {
2024         const struct xfrm_tmpl *t;
2025         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2026         int socklen = 0;
2027         int i;
2028
2029         for (i=0; i<xp->xfrm_nr; i++) {
2030                 t = xp->xfrm_vec + i;
2031                 socklen += pfkey_sockaddr_len(t->encap_family);
2032         }
2033
2034         return sizeof(struct sadb_msg) +
2035                 (sizeof(struct sadb_lifetime) * 3) +
2036                 (sizeof(struct sadb_address) * 2) +
2037                 (sockaddr_size * 2) +
2038                 sizeof(struct sadb_x_policy) +
2039                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2040                 (socklen * 2) +
2041                 pfkey_xfrm_policy2sec_ctx_size(xp);
2042 }
2043
2044 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2045 {
2046         struct sk_buff *skb;
2047         int size;
2048
2049         size = pfkey_xfrm_policy2msg_size(xp);
2050
2051         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2052         if (skb == NULL)
2053                 return ERR_PTR(-ENOBUFS);
2054
2055         return skb;
2056 }
2057
2058 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2059 {
2060         struct sadb_msg *hdr;
2061         struct sadb_address *addr;
2062         struct sadb_lifetime *lifetime;
2063         struct sadb_x_policy *pol;
2064         struct sadb_x_sec_ctx *sec_ctx;
2065         struct xfrm_sec_ctx *xfrm_ctx;
2066         int i;
2067         int size;
2068         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2069         int socklen = pfkey_sockaddr_len(xp->family);
2070
2071         size = pfkey_xfrm_policy2msg_size(xp);
2072
2073         /* call should fill header later */
2074         hdr = skb_put(skb, sizeof(struct sadb_msg));
2075         memset(hdr, 0, size);   /* XXX do we need this ? */
2076
2077         /* src address */
2078         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2079         addr->sadb_address_len =
2080                 (sizeof(struct sadb_address)+sockaddr_size)/
2081                         sizeof(uint64_t);
2082         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2083         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2084         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2085         addr->sadb_address_reserved = 0;
2086         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2087                                  xp->selector.sport,
2088                                  (struct sockaddr *) (addr + 1),
2089                                  xp->family))
2090                 BUG();
2091
2092         /* dst address */
2093         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2094         addr->sadb_address_len =
2095                 (sizeof(struct sadb_address)+sockaddr_size)/
2096                         sizeof(uint64_t);
2097         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2098         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2099         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2100         addr->sadb_address_reserved = 0;
2101
2102         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2103                             (struct sockaddr *) (addr + 1),
2104                             xp->family);
2105
2106         /* hard time */
2107         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2108         lifetime->sadb_lifetime_len =
2109                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2110         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2111         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2112         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2113         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2114         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2115         /* soft time */
2116         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2117         lifetime->sadb_lifetime_len =
2118                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2119         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2120         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2121         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2122         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2123         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2124         /* current time */
2125         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2126         lifetime->sadb_lifetime_len =
2127                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2128         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2129         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2130         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2131         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2132         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2133
2134         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2135         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2136         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2137         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2138         if (xp->action == XFRM_POLICY_ALLOW) {
2139                 if (xp->xfrm_nr)
2140                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2141                 else
2142                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2143         }
2144         pol->sadb_x_policy_dir = dir+1;
2145         pol->sadb_x_policy_reserved = 0;
2146         pol->sadb_x_policy_id = xp->index;
2147         pol->sadb_x_policy_priority = xp->priority;
2148
2149         for (i=0; i<xp->xfrm_nr; i++) {
2150                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2151                 struct sadb_x_ipsecrequest *rq;
2152                 int req_size;
2153                 int mode;
2154
2155                 req_size = sizeof(struct sadb_x_ipsecrequest);
2156                 if (t->mode == XFRM_MODE_TUNNEL) {
2157                         socklen = pfkey_sockaddr_len(t->encap_family);
2158                         req_size += socklen * 2;
2159                 } else {
2160                         size -= 2*socklen;
2161                 }
2162                 rq = skb_put(skb, req_size);
2163                 pol->sadb_x_policy_len += req_size/8;
2164                 memset(rq, 0, sizeof(*rq));
2165                 rq->sadb_x_ipsecrequest_len = req_size;
2166                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2167                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2168                         return -EINVAL;
2169                 rq->sadb_x_ipsecrequest_mode = mode;
2170                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2171                 if (t->reqid)
2172                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2173                 if (t->optional)
2174                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2175                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2176
2177                 if (t->mode == XFRM_MODE_TUNNEL) {
2178                         u8 *sa = (void *)(rq + 1);
2179                         pfkey_sockaddr_fill(&t->saddr, 0,
2180                                             (struct sockaddr *)sa,
2181                                             t->encap_family);
2182                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2183                                             (struct sockaddr *) (sa + socklen),
2184                                             t->encap_family);
2185                 }
2186         }
2187
2188         /* security context */
2189         if ((xfrm_ctx = xp->security)) {
2190                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2191
2192                 sec_ctx = skb_put(skb, ctx_size);
2193                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2194                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2195                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2196                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2197                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2198                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2199                        xfrm_ctx->ctx_len);
2200         }
2201
2202         hdr->sadb_msg_len = size / sizeof(uint64_t);
2203         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2204
2205         return 0;
2206 }
2207
2208 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2209 {
2210         struct sk_buff *out_skb;
2211         struct sadb_msg *out_hdr;
2212         int err;
2213
2214         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2215         if (IS_ERR(out_skb))
2216                 return PTR_ERR(out_skb);
2217
2218         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2219         if (err < 0) {
2220                 kfree_skb(out_skb);
2221                 return err;
2222         }
2223
2224         out_hdr = (struct sadb_msg *) out_skb->data;
2225         out_hdr->sadb_msg_version = PF_KEY_V2;
2226
2227         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2228                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2229         else
2230                 out_hdr->sadb_msg_type = event2poltype(c->event);
2231         out_hdr->sadb_msg_errno = 0;
2232         out_hdr->sadb_msg_seq = c->seq;
2233         out_hdr->sadb_msg_pid = c->portid;
2234         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2235         return 0;
2236
2237 }
2238
2239 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2240 {
2241         struct net *net = sock_net(sk);
2242         int err = 0;
2243         struct sadb_lifetime *lifetime;
2244         struct sadb_address *sa;
2245         struct sadb_x_policy *pol;
2246         struct xfrm_policy *xp;
2247         struct km_event c;
2248         struct sadb_x_sec_ctx *sec_ctx;
2249
2250         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2251                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2252             !ext_hdrs[SADB_X_EXT_POLICY-1])
2253                 return -EINVAL;
2254
2255         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2256         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2257                 return -EINVAL;
2258         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2259                 return -EINVAL;
2260
2261         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2262         if (xp == NULL)
2263                 return -ENOBUFS;
2264
2265         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2266                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2267         xp->priority = pol->sadb_x_policy_priority;
2268
2269         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2270         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2271         xp->selector.family = xp->family;
2272         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2273         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2274         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2275         if (xp->selector.sport)
2276                 xp->selector.sport_mask = htons(0xffff);
2277
2278         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2279         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2280         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2281
2282         /* Amusing, we set this twice.  KAME apps appear to set same value
2283          * in both addresses.
2284          */
2285         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2286
2287         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2288         if (xp->selector.dport)
2289                 xp->selector.dport_mask = htons(0xffff);
2290
2291         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2292         if (sec_ctx != NULL) {
2293                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2294
2295                 if (!uctx) {
2296                         err = -ENOBUFS;
2297                         goto out;
2298                 }
2299
2300                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2301                 kfree(uctx);
2302
2303                 if (err)
2304                         goto out;
2305         }
2306
2307         xp->lft.soft_byte_limit = XFRM_INF;
2308         xp->lft.hard_byte_limit = XFRM_INF;
2309         xp->lft.soft_packet_limit = XFRM_INF;
2310         xp->lft.hard_packet_limit = XFRM_INF;
2311         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2312                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2313                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2314                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2315                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2316         }
2317         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2318                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2319                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2320                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2321                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2322         }
2323         xp->xfrm_nr = 0;
2324         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2325             (err = parse_ipsecrequests(xp, pol)) < 0)
2326                 goto out;
2327
2328         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2329                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2330
2331         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2332
2333         if (err)
2334                 goto out;
2335
2336         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2337                 c.event = XFRM_MSG_UPDPOLICY;
2338         else
2339                 c.event = XFRM_MSG_NEWPOLICY;
2340
2341         c.seq = hdr->sadb_msg_seq;
2342         c.portid = hdr->sadb_msg_pid;
2343
2344         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2345         xfrm_pol_put(xp);
2346         return 0;
2347
2348 out:
2349         xp->walk.dead = 1;
2350         xfrm_policy_destroy(xp);
2351         return err;
2352 }
2353
2354 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2355 {
2356         struct net *net = sock_net(sk);
2357         int err;
2358         struct sadb_address *sa;
2359         struct sadb_x_policy *pol;
2360         struct xfrm_policy *xp;
2361         struct xfrm_selector sel;
2362         struct km_event c;
2363         struct sadb_x_sec_ctx *sec_ctx;
2364         struct xfrm_sec_ctx *pol_ctx = NULL;
2365
2366         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2367                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2368             !ext_hdrs[SADB_X_EXT_POLICY-1])
2369                 return -EINVAL;
2370
2371         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2372         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2373                 return -EINVAL;
2374
2375         memset(&sel, 0, sizeof(sel));
2376
2377         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2378         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2379         sel.prefixlen_s = sa->sadb_address_prefixlen;
2380         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2381         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2382         if (sel.sport)
2383                 sel.sport_mask = htons(0xffff);
2384
2385         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2386         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2387         sel.prefixlen_d = sa->sadb_address_prefixlen;
2388         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2389         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2390         if (sel.dport)
2391                 sel.dport_mask = htons(0xffff);
2392
2393         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2394         if (sec_ctx != NULL) {
2395                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2396
2397                 if (!uctx)
2398                         return -ENOMEM;
2399
2400                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2401                 kfree(uctx);
2402                 if (err)
2403                         return err;
2404         }
2405
2406         xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2407                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2408                                    1, &err);
2409         security_xfrm_policy_free(pol_ctx);
2410         if (xp == NULL)
2411                 return -ENOENT;
2412
2413         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2414
2415         if (err)
2416                 goto out;
2417
2418         c.seq = hdr->sadb_msg_seq;
2419         c.portid = hdr->sadb_msg_pid;
2420         c.data.byid = 0;
2421         c.event = XFRM_MSG_DELPOLICY;
2422         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2423
2424 out:
2425         xfrm_pol_put(xp);
2426         return err;
2427 }
2428
2429 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2430 {
2431         int err;
2432         struct sk_buff *out_skb;
2433         struct sadb_msg *out_hdr;
2434         err = 0;
2435
2436         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2437         if (IS_ERR(out_skb)) {
2438                 err =  PTR_ERR(out_skb);
2439                 goto out;
2440         }
2441         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2442         if (err < 0) {
2443                 kfree_skb(out_skb);
2444                 goto out;
2445         }
2446
2447         out_hdr = (struct sadb_msg *) out_skb->data;
2448         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2449         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2450         out_hdr->sadb_msg_satype = 0;
2451         out_hdr->sadb_msg_errno = 0;
2452         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2453         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2454         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2455         err = 0;
2456
2457 out:
2458         return err;
2459 }
2460
2461 static int pfkey_sockaddr_pair_size(sa_family_t family)
2462 {
2463         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2464 }
2465
2466 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2467                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2468                                u16 *family)
2469 {
2470         int af, socklen;
2471
2472         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2473                 return -EINVAL;
2474
2475         af = pfkey_sockaddr_extract(sa, saddr);
2476         if (!af)
2477                 return -EINVAL;
2478
2479         socklen = pfkey_sockaddr_len(af);
2480         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2481                                    daddr) != af)
2482                 return -EINVAL;
2483
2484         *family = af;
2485         return 0;
2486 }
2487
2488 #ifdef CONFIG_NET_KEY_MIGRATE
2489 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2490                                     struct xfrm_migrate *m)
2491 {
2492         int err;
2493         struct sadb_x_ipsecrequest *rq2;
2494         int mode;
2495
2496         if (len < sizeof(*rq1) ||
2497             len < rq1->sadb_x_ipsecrequest_len ||
2498             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2499                 return -EINVAL;
2500
2501         /* old endoints */
2502         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2503                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2504                                   &m->old_saddr, &m->old_daddr,
2505                                   &m->old_family);
2506         if (err)
2507                 return err;
2508
2509         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2510         len -= rq1->sadb_x_ipsecrequest_len;
2511
2512         if (len <= sizeof(*rq2) ||
2513             len < rq2->sadb_x_ipsecrequest_len ||
2514             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2515                 return -EINVAL;
2516
2517         /* new endpoints */
2518         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2519                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2520                                   &m->new_saddr, &m->new_daddr,
2521                                   &m->new_family);
2522         if (err)
2523                 return err;
2524
2525         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2526             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2527             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2528                 return -EINVAL;
2529
2530         m->proto = rq1->sadb_x_ipsecrequest_proto;
2531         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2532                 return -EINVAL;
2533         m->mode = mode;
2534         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2535
2536         return ((int)(rq1->sadb_x_ipsecrequest_len +
2537                       rq2->sadb_x_ipsecrequest_len));
2538 }
2539
2540 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2541                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2542 {
2543         int i, len, ret, err = -EINVAL;
2544         u8 dir;
2545         struct sadb_address *sa;
2546         struct sadb_x_kmaddress *kma;
2547         struct sadb_x_policy *pol;
2548         struct sadb_x_ipsecrequest *rq;
2549         struct xfrm_selector sel;
2550         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2551         struct xfrm_kmaddress k;
2552         struct net *net = sock_net(sk);
2553
2554         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2555                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2556             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2557                 err = -EINVAL;
2558                 goto out;
2559         }
2560
2561         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2562         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2563
2564         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2565                 err = -EINVAL;
2566                 goto out;
2567         }
2568
2569         if (kma) {
2570                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2571                 k.reserved = kma->sadb_x_kmaddress_reserved;
2572                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2573                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2574                                           &k.local, &k.remote, &k.family);
2575                 if (ret < 0) {
2576                         err = ret;
2577                         goto out;
2578                 }
2579         }
2580
2581         dir = pol->sadb_x_policy_dir - 1;
2582         memset(&sel, 0, sizeof(sel));
2583
2584         /* set source address info of selector */
2585         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2586         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2587         sel.prefixlen_s = sa->sadb_address_prefixlen;
2588         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2589         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2590         if (sel.sport)
2591                 sel.sport_mask = htons(0xffff);
2592
2593         /* set destination address info of selector */
2594         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2595         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2596         sel.prefixlen_d = sa->sadb_address_prefixlen;
2597         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2598         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2599         if (sel.dport)
2600                 sel.dport_mask = htons(0xffff);
2601
2602         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2603
2604         /* extract ipsecrequests */
2605         i = 0;
2606         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2607
2608         while (len > 0 && i < XFRM_MAX_DEPTH) {
2609                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2610                 if (ret < 0) {
2611                         err = ret;
2612                         goto out;
2613                 } else {
2614                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2615                         len -= ret;
2616                         i++;
2617                 }
2618         }
2619
2620         if (!i || len > 0) {
2621                 err = -EINVAL;
2622                 goto out;
2623         }
2624
2625         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2626                             kma ? &k : NULL, net, NULL);
2627
2628  out:
2629         return err;
2630 }
2631 #else
2632 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2633                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2634 {
2635         return -ENOPROTOOPT;
2636 }
2637 #endif
2638
2639
2640 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2641 {
2642         struct net *net = sock_net(sk);
2643         unsigned int dir;
2644         int err = 0, delete;
2645         struct sadb_x_policy *pol;
2646         struct xfrm_policy *xp;
2647         struct km_event c;
2648
2649         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2650                 return -EINVAL;
2651
2652         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2653         if (dir >= XFRM_POLICY_MAX)
2654                 return -EINVAL;
2655
2656         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2657         xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2658                               dir, pol->sadb_x_policy_id, delete, &err);
2659         if (xp == NULL)
2660                 return -ENOENT;
2661
2662         if (delete) {
2663                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2664
2665                 if (err)
2666                         goto out;
2667                 c.seq = hdr->sadb_msg_seq;
2668                 c.portid = hdr->sadb_msg_pid;
2669                 c.data.byid = 1;
2670                 c.event = XFRM_MSG_DELPOLICY;
2671                 km_policy_notify(xp, dir, &c);
2672         } else {
2673                 err = key_pol_get_resp(sk, xp, hdr, dir);
2674         }
2675
2676 out:
2677         xfrm_pol_put(xp);
2678         return err;
2679 }
2680
2681 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2682 {
2683         struct pfkey_sock *pfk = ptr;
2684         struct sk_buff *out_skb;
2685         struct sadb_msg *out_hdr;
2686         int err;
2687
2688         if (!pfkey_can_dump(&pfk->sk))
2689                 return -ENOBUFS;
2690
2691         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2692         if (IS_ERR(out_skb))
2693                 return PTR_ERR(out_skb);
2694
2695         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2696         if (err < 0) {
2697                 kfree_skb(out_skb);
2698                 return err;
2699         }
2700
2701         out_hdr = (struct sadb_msg *) out_skb->data;
2702         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2703         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2704         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2705         out_hdr->sadb_msg_errno = 0;
2706         out_hdr->sadb_msg_seq = count + 1;
2707         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2708
2709         if (pfk->dump.skb)
2710                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2711                                 &pfk->sk, sock_net(&pfk->sk));
2712         pfk->dump.skb = out_skb;
2713
2714         return 0;
2715 }
2716
2717 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2718 {
2719         struct net *net = sock_net(&pfk->sk);
2720         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2721 }
2722
2723 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2724 {
2725         struct net *net = sock_net((struct sock *)pfk);
2726
2727         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2728 }
2729
2730 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2731 {
2732         struct pfkey_sock *pfk = pfkey_sk(sk);
2733
2734         mutex_lock(&pfk->dump_lock);
2735         if (pfk->dump.dump != NULL) {
2736                 mutex_unlock(&pfk->dump_lock);
2737                 return -EBUSY;
2738         }
2739
2740         pfk->dump.msg_version = hdr->sadb_msg_version;
2741         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2742         pfk->dump.dump = pfkey_dump_sp;
2743         pfk->dump.done = pfkey_dump_sp_done;
2744         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2745         mutex_unlock(&pfk->dump_lock);
2746
2747         return pfkey_do_dump(pfk);
2748 }
2749
2750 static int key_notify_policy_flush(const struct km_event *c)
2751 {
2752         struct sk_buff *skb_out;
2753         struct sadb_msg *hdr;
2754
2755         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2756         if (!skb_out)
2757                 return -ENOBUFS;
2758         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2759         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2760         hdr->sadb_msg_seq = c->seq;
2761         hdr->sadb_msg_pid = c->portid;
2762         hdr->sadb_msg_version = PF_KEY_V2;
2763         hdr->sadb_msg_errno = (uint8_t) 0;
2764         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2765         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2766         hdr->sadb_msg_reserved = 0;
2767         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2768         return 0;
2769
2770 }
2771
2772 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2773 {
2774         struct net *net = sock_net(sk);
2775         struct km_event c;
2776         int err, err2;
2777
2778         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2779         err2 = unicast_flush_resp(sk, hdr);
2780         if (err || err2) {
2781                 if (err == -ESRCH) /* empty table - old silent behavior */
2782                         return 0;
2783                 return err;
2784         }
2785
2786         c.data.type = XFRM_POLICY_TYPE_MAIN;
2787         c.event = XFRM_MSG_FLUSHPOLICY;
2788         c.portid = hdr->sadb_msg_pid;
2789         c.seq = hdr->sadb_msg_seq;
2790         c.net = net;
2791         km_policy_notify(NULL, 0, &c);
2792
2793         return 0;
2794 }
2795
2796 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2797                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2798 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2799         [SADB_RESERVED]         = pfkey_reserved,
2800         [SADB_GETSPI]           = pfkey_getspi,
2801         [SADB_UPDATE]           = pfkey_add,
2802         [SADB_ADD]              = pfkey_add,
2803         [SADB_DELETE]           = pfkey_delete,
2804         [SADB_GET]              = pfkey_get,
2805         [SADB_ACQUIRE]          = pfkey_acquire,
2806         [SADB_REGISTER]         = pfkey_register,
2807         [SADB_EXPIRE]           = NULL,
2808         [SADB_FLUSH]            = pfkey_flush,
2809         [SADB_DUMP]             = pfkey_dump,
2810         [SADB_X_PROMISC]        = pfkey_promisc,
2811         [SADB_X_PCHANGE]        = NULL,
2812         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2813         [SADB_X_SPDADD]         = pfkey_spdadd,
2814         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2815         [SADB_X_SPDGET]         = pfkey_spdget,
2816         [SADB_X_SPDACQUIRE]     = NULL,
2817         [SADB_X_SPDDUMP]        = pfkey_spddump,
2818         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2819         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2820         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2821         [SADB_X_MIGRATE]        = pfkey_migrate,
2822 };
2823
2824 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2825 {
2826         void *ext_hdrs[SADB_EXT_MAX];
2827         int err;
2828
2829         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2830                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2831
2832         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2833         err = parse_exthdrs(skb, hdr, ext_hdrs);
2834         if (!err) {
2835                 err = -EOPNOTSUPP;
2836                 if (pfkey_funcs[hdr->sadb_msg_type])
2837                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2838         }
2839         return err;
2840 }
2841
2842 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2843 {
2844         struct sadb_msg *hdr = NULL;
2845
2846         if (skb->len < sizeof(*hdr)) {
2847                 *errp = -EMSGSIZE;
2848         } else {
2849                 hdr = (struct sadb_msg *) skb->data;
2850                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2851                     hdr->sadb_msg_reserved != 0 ||
2852                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2853                      hdr->sadb_msg_type > SADB_MAX)) {
2854                         hdr = NULL;
2855                         *errp = -EINVAL;
2856                 } else if (hdr->sadb_msg_len != (skb->len /
2857                                                  sizeof(uint64_t)) ||
2858                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2859                                                 sizeof(uint64_t))) {
2860                         hdr = NULL;
2861                         *errp = -EMSGSIZE;
2862                 } else {
2863                         *errp = 0;
2864                 }
2865         }
2866         return hdr;
2867 }
2868
2869 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2870                                 const struct xfrm_algo_desc *d)
2871 {
2872         unsigned int id = d->desc.sadb_alg_id;
2873
2874         if (id >= sizeof(t->aalgos) * 8)
2875                 return 0;
2876
2877         return (t->aalgos >> id) & 1;
2878 }
2879
2880 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2881                                 const struct xfrm_algo_desc *d)
2882 {
2883         unsigned int id = d->desc.sadb_alg_id;
2884
2885         if (id >= sizeof(t->ealgos) * 8)
2886                 return 0;
2887
2888         return (t->ealgos >> id) & 1;
2889 }
2890
2891 static int count_ah_combs(const struct xfrm_tmpl *t)
2892 {
2893         int i, sz = 0;
2894
2895         for (i = 0; ; i++) {
2896                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2897                 if (!aalg)
2898                         break;
2899                 if (!aalg->pfkey_supported)
2900                         continue;
2901                 if (aalg_tmpl_set(t, aalg))
2902                         sz += sizeof(struct sadb_comb);
2903         }
2904         return sz + sizeof(struct sadb_prop);
2905 }
2906
2907 static int count_esp_combs(const struct xfrm_tmpl *t)
2908 {
2909         int i, k, sz = 0;
2910
2911         for (i = 0; ; i++) {
2912                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2913                 if (!ealg)
2914                         break;
2915
2916                 if (!ealg->pfkey_supported)
2917                         continue;
2918
2919                 if (!(ealg_tmpl_set(t, ealg)))
2920                         continue;
2921
2922                 for (k = 1; ; k++) {
2923                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2924                         if (!aalg)
2925                                 break;
2926
2927                         if (!aalg->pfkey_supported)
2928                                 continue;
2929
2930                         if (aalg_tmpl_set(t, aalg))
2931                                 sz += sizeof(struct sadb_comb);
2932                 }
2933         }
2934         return sz + sizeof(struct sadb_prop);
2935 }
2936
2937 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2938 {
2939         struct sadb_prop *p;
2940         int i;
2941
2942         p = skb_put(skb, sizeof(struct sadb_prop));
2943         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2944         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2945         p->sadb_prop_replay = 32;
2946         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2947
2948         for (i = 0; ; i++) {
2949                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2950                 if (!aalg)
2951                         break;
2952
2953                 if (!aalg->pfkey_supported)
2954                         continue;
2955
2956                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2957                         struct sadb_comb *c;
2958                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2959                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2960                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2961                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2962                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2963                         c->sadb_comb_hard_addtime = 24*60*60;
2964                         c->sadb_comb_soft_addtime = 20*60*60;
2965                         c->sadb_comb_hard_usetime = 8*60*60;
2966                         c->sadb_comb_soft_usetime = 7*60*60;
2967                 }
2968         }
2969 }
2970
2971 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2972 {
2973         struct sadb_prop *p;
2974         int i, k;
2975
2976         p = skb_put(skb, sizeof(struct sadb_prop));
2977         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2978         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2979         p->sadb_prop_replay = 32;
2980         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2981
2982         for (i=0; ; i++) {
2983                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2984                 if (!ealg)
2985                         break;
2986
2987                 if (!ealg->pfkey_supported)
2988                         continue;
2989
2990                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2991                         continue;
2992
2993                 for (k = 1; ; k++) {
2994                         struct sadb_comb *c;
2995                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2996                         if (!aalg)
2997                                 break;
2998                         if (!aalg->pfkey_supported)
2999                                 continue;
3000                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3001                                 continue;
3002                         c = skb_put(skb, sizeof(struct sadb_comb));
3003                         memset(c, 0, sizeof(*c));
3004                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3005                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3006                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3007                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3008                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3009                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3010                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3011                         c->sadb_comb_hard_addtime = 24*60*60;
3012                         c->sadb_comb_soft_addtime = 20*60*60;
3013                         c->sadb_comb_hard_usetime = 8*60*60;
3014                         c->sadb_comb_soft_usetime = 7*60*60;
3015                 }
3016         }
3017 }
3018
3019 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3020 {
3021         return 0;
3022 }
3023
3024 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3025 {
3026         struct sk_buff *out_skb;
3027         struct sadb_msg *out_hdr;
3028         int hard;
3029         int hsc;
3030
3031         hard = c->data.hard;
3032         if (hard)
3033                 hsc = 2;
3034         else
3035                 hsc = 1;
3036
3037         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3038         if (IS_ERR(out_skb))
3039                 return PTR_ERR(out_skb);
3040
3041         out_hdr = (struct sadb_msg *) out_skb->data;
3042         out_hdr->sadb_msg_version = PF_KEY_V2;
3043         out_hdr->sadb_msg_type = SADB_EXPIRE;
3044         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3045         out_hdr->sadb_msg_errno = 0;
3046         out_hdr->sadb_msg_reserved = 0;
3047         out_hdr->sadb_msg_seq = 0;
3048         out_hdr->sadb_msg_pid = 0;
3049
3050         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3051                         xs_net(x));
3052         return 0;
3053 }
3054
3055 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3056 {
3057         struct net *net = x ? xs_net(x) : c->net;
3058         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3059
3060         if (atomic_read(&net_pfkey->socks_nr) == 0)
3061                 return 0;
3062
3063         switch (c->event) {
3064         case XFRM_MSG_EXPIRE:
3065                 return key_notify_sa_expire(x, c);
3066         case XFRM_MSG_DELSA:
3067         case XFRM_MSG_NEWSA:
3068         case XFRM_MSG_UPDSA:
3069                 return key_notify_sa(x, c);
3070         case XFRM_MSG_FLUSHSA:
3071                 return key_notify_sa_flush(c);
3072         case XFRM_MSG_NEWAE: /* not yet supported */
3073                 break;
3074         default:
3075                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3076                 break;
3077         }
3078
3079         return 0;
3080 }
3081
3082 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3083 {
3084         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3085                 return 0;
3086
3087         switch (c->event) {
3088         case XFRM_MSG_POLEXPIRE:
3089                 return key_notify_policy_expire(xp, c);
3090         case XFRM_MSG_DELPOLICY:
3091         case XFRM_MSG_NEWPOLICY:
3092         case XFRM_MSG_UPDPOLICY:
3093                 return key_notify_policy(xp, dir, c);
3094         case XFRM_MSG_FLUSHPOLICY:
3095                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3096                         break;
3097                 return key_notify_policy_flush(c);
3098         default:
3099                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3100                 break;
3101         }
3102
3103         return 0;
3104 }
3105
3106 static u32 get_acqseq(void)
3107 {
3108         u32 res;
3109         static atomic_t acqseq;
3110
3111         do {
3112                 res = atomic_inc_return(&acqseq);
3113         } while (!res);
3114         return res;
3115 }
3116
3117 static bool pfkey_is_alive(const struct km_event *c)
3118 {
3119         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3120         struct sock *sk;
3121         bool is_alive = false;
3122
3123         rcu_read_lock();
3124         sk_for_each_rcu(sk, &net_pfkey->table) {
3125                 if (pfkey_sk(sk)->registered) {
3126                         is_alive = true;
3127                         break;
3128                 }
3129         }
3130         rcu_read_unlock();
3131
3132         return is_alive;
3133 }
3134
3135 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3136 {
3137         struct sk_buff *skb;
3138         struct sadb_msg *hdr;
3139         struct sadb_address *addr;
3140         struct sadb_x_policy *pol;
3141         int sockaddr_size;
3142         int size;
3143         struct sadb_x_sec_ctx *sec_ctx;
3144         struct xfrm_sec_ctx *xfrm_ctx;
3145         int ctx_size = 0;
3146
3147         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3148         if (!sockaddr_size)
3149                 return -EINVAL;
3150
3151         size = sizeof(struct sadb_msg) +
3152                 (sizeof(struct sadb_address) * 2) +
3153                 (sockaddr_size * 2) +
3154                 sizeof(struct sadb_x_policy);
3155
3156         if (x->id.proto == IPPROTO_AH)
3157                 size += count_ah_combs(t);
3158         else if (x->id.proto == IPPROTO_ESP)
3159                 size += count_esp_combs(t);
3160
3161         if ((xfrm_ctx = x->security)) {
3162                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3163                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3164         }
3165
3166         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3167         if (skb == NULL)
3168                 return -ENOMEM;
3169
3170         hdr = skb_put(skb, sizeof(struct sadb_msg));
3171         hdr->sadb_msg_version = PF_KEY_V2;
3172         hdr->sadb_msg_type = SADB_ACQUIRE;
3173         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3174         hdr->sadb_msg_len = size / sizeof(uint64_t);
3175         hdr->sadb_msg_errno = 0;
3176         hdr->sadb_msg_reserved = 0;
3177         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3178         hdr->sadb_msg_pid = 0;
3179
3180         /* src address */
3181         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3182         addr->sadb_address_len =
3183                 (sizeof(struct sadb_address)+sockaddr_size)/
3184                         sizeof(uint64_t);
3185         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3186         addr->sadb_address_proto = 0;
3187         addr->sadb_address_reserved = 0;
3188         addr->sadb_address_prefixlen =
3189                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3190                                     (struct sockaddr *) (addr + 1),
3191                                     x->props.family);
3192         if (!addr->sadb_address_prefixlen)
3193                 BUG();
3194
3195         /* dst address */
3196         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3197         addr->sadb_address_len =
3198                 (sizeof(struct sadb_address)+sockaddr_size)/
3199                         sizeof(uint64_t);
3200         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3201         addr->sadb_address_proto = 0;
3202         addr->sadb_address_reserved = 0;
3203         addr->sadb_address_prefixlen =
3204                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3205                                     (struct sockaddr *) (addr + 1),
3206                                     x->props.family);
3207         if (!addr->sadb_address_prefixlen)
3208                 BUG();
3209
3210         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3211         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3212         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3213         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3214         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3215         pol->sadb_x_policy_reserved = 0;
3216         pol->sadb_x_policy_id = xp->index;
3217         pol->sadb_x_policy_priority = xp->priority;
3218
3219         /* Set sadb_comb's. */
3220         if (x->id.proto == IPPROTO_AH)
3221                 dump_ah_combs(skb, t);
3222         else if (x->id.proto == IPPROTO_ESP)
3223                 dump_esp_combs(skb, t);
3224
3225         /* security context */
3226         if (xfrm_ctx) {
3227                 sec_ctx = skb_put(skb,
3228                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3229                 sec_ctx->sadb_x_sec_len =
3230                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3231                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3232                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3233                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3234                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3235                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3236                        xfrm_ctx->ctx_len);
3237         }
3238
3239         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3240                                xs_net(x));
3241 }
3242
3243 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3244                                                 u8 *data, int len, int *dir)
3245 {
3246         struct net *net = sock_net(sk);
3247         struct xfrm_policy *xp;
3248         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3249         struct sadb_x_sec_ctx *sec_ctx;
3250
3251         switch (sk->sk_family) {
3252         case AF_INET:
3253                 if (opt != IP_IPSEC_POLICY) {
3254                         *dir = -EOPNOTSUPP;
3255                         return NULL;
3256                 }
3257                 break;
3258 #if IS_ENABLED(CONFIG_IPV6)
3259         case AF_INET6:
3260                 if (opt != IPV6_IPSEC_POLICY) {
3261                         *dir = -EOPNOTSUPP;
3262                         return NULL;
3263                 }
3264                 break;
3265 #endif
3266         default:
3267                 *dir = -EINVAL;
3268                 return NULL;
3269         }
3270
3271         *dir = -EINVAL;
3272
3273         if (len < sizeof(struct sadb_x_policy) ||
3274             pol->sadb_x_policy_len*8 > len ||
3275             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3276             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3277                 return NULL;
3278
3279         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3280         if (xp == NULL) {
3281                 *dir = -ENOBUFS;
3282                 return NULL;
3283         }
3284
3285         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3286                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3287
3288         xp->lft.soft_byte_limit = XFRM_INF;
3289         xp->lft.hard_byte_limit = XFRM_INF;
3290         xp->lft.soft_packet_limit = XFRM_INF;
3291         xp->lft.hard_packet_limit = XFRM_INF;
3292         xp->family = sk->sk_family;
3293
3294         xp->xfrm_nr = 0;
3295         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3296             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3297                 goto out;
3298
3299         /* security context too */
3300         if (len >= (pol->sadb_x_policy_len*8 +
3301             sizeof(struct sadb_x_sec_ctx))) {
3302                 char *p = (char *)pol;
3303                 struct xfrm_user_sec_ctx *uctx;
3304
3305                 p += pol->sadb_x_policy_len*8;
3306                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3307                 if (len < pol->sadb_x_policy_len*8 +
3308                     sec_ctx->sadb_x_sec_len*8) {
3309                         *dir = -EINVAL;
3310                         goto out;
3311                 }
3312                 if ((*dir = verify_sec_ctx_len(p)))
3313                         goto out;
3314                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3315                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3316                 kfree(uctx);
3317
3318                 if (*dir)
3319                         goto out;
3320         }
3321
3322         *dir = pol->sadb_x_policy_dir-1;
3323         return xp;
3324
3325 out:
3326         xp->walk.dead = 1;
3327         xfrm_policy_destroy(xp);
3328         return NULL;
3329 }
3330
3331 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3332 {
3333         struct sk_buff *skb;
3334         struct sadb_msg *hdr;
3335         struct sadb_sa *sa;
3336         struct sadb_address *addr;
3337         struct sadb_x_nat_t_port *n_port;
3338         int sockaddr_size;
3339         int size;
3340         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3341         struct xfrm_encap_tmpl *natt = NULL;
3342
3343         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3344         if (!sockaddr_size)
3345                 return -EINVAL;
3346
3347         if (!satype)
3348                 return -EINVAL;
3349
3350         if (!x->encap)
3351                 return -EINVAL;
3352
3353         natt = x->encap;
3354
3355         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3356          *
3357          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3358          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3359          */
3360
3361         size = sizeof(struct sadb_msg) +
3362                 sizeof(struct sadb_sa) +
3363                 (sizeof(struct sadb_address) * 2) +
3364                 (sockaddr_size * 2) +
3365                 (sizeof(struct sadb_x_nat_t_port) * 2);
3366
3367         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3368         if (skb == NULL)
3369                 return -ENOMEM;
3370
3371         hdr = skb_put(skb, sizeof(struct sadb_msg));
3372         hdr->sadb_msg_version = PF_KEY_V2;
3373         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3374         hdr->sadb_msg_satype = satype;
3375         hdr->sadb_msg_len = size / sizeof(uint64_t);
3376         hdr->sadb_msg_errno = 0;
3377         hdr->sadb_msg_reserved = 0;
3378         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3379         hdr->sadb_msg_pid = 0;
3380
3381         /* SA */
3382         sa = skb_put(skb, sizeof(struct sadb_sa));
3383         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3384         sa->sadb_sa_exttype = SADB_EXT_SA;
3385         sa->sadb_sa_spi = x->id.spi;
3386         sa->sadb_sa_replay = 0;
3387         sa->sadb_sa_state = 0;
3388         sa->sadb_sa_auth = 0;
3389         sa->sadb_sa_encrypt = 0;
3390         sa->sadb_sa_flags = 0;
3391
3392         /* ADDRESS_SRC (old addr) */
3393         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3394         addr->sadb_address_len =
3395                 (sizeof(struct sadb_address)+sockaddr_size)/
3396                         sizeof(uint64_t);
3397         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3398         addr->sadb_address_proto = 0;
3399         addr->sadb_address_reserved = 0;
3400         addr->sadb_address_prefixlen =
3401                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3402                                     (struct sockaddr *) (addr + 1),
3403                                     x->props.family);
3404         if (!addr->sadb_address_prefixlen)
3405                 BUG();
3406
3407         /* NAT_T_SPORT (old port) */
3408         n_port = skb_put(skb, sizeof(*n_port));
3409         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3410         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3411         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3412         n_port->sadb_x_nat_t_port_reserved = 0;
3413
3414         /* ADDRESS_DST (new addr) */
3415         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3416         addr->sadb_address_len =
3417                 (sizeof(struct sadb_address)+sockaddr_size)/
3418                         sizeof(uint64_t);
3419         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3420         addr->sadb_address_proto = 0;
3421         addr->sadb_address_reserved = 0;
3422         addr->sadb_address_prefixlen =
3423                 pfkey_sockaddr_fill(ipaddr, 0,
3424                                     (struct sockaddr *) (addr + 1),
3425                                     x->props.family);
3426         if (!addr->sadb_address_prefixlen)
3427                 BUG();
3428
3429         /* NAT_T_DPORT (new port) */
3430         n_port = skb_put(skb, sizeof(*n_port));
3431         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3432         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3433         n_port->sadb_x_nat_t_port_port = sport;
3434         n_port->sadb_x_nat_t_port_reserved = 0;
3435
3436         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3437                                xs_net(x));
3438 }
3439
3440 #ifdef CONFIG_NET_KEY_MIGRATE
3441 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3442                             const struct xfrm_selector *sel)
3443 {
3444         struct sadb_address *addr;
3445         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3446         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3447         addr->sadb_address_exttype = type;
3448         addr->sadb_address_proto = sel->proto;
3449         addr->sadb_address_reserved = 0;
3450
3451         switch (type) {
3452         case SADB_EXT_ADDRESS_SRC:
3453                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3454                 pfkey_sockaddr_fill(&sel->saddr, 0,
3455                                     (struct sockaddr *)(addr + 1),
3456                                     sel->family);
3457                 break;
3458         case SADB_EXT_ADDRESS_DST:
3459                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3460                 pfkey_sockaddr_fill(&sel->daddr, 0,
3461                                     (struct sockaddr *)(addr + 1),
3462                                     sel->family);
3463                 break;
3464         default:
3465                 return -EINVAL;
3466         }
3467
3468         return 0;
3469 }
3470
3471
3472 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3473 {
3474         struct sadb_x_kmaddress *kma;
3475         u8 *sa;
3476         int family = k->family;
3477         int socklen = pfkey_sockaddr_len(family);
3478         int size_req;
3479
3480         size_req = (sizeof(struct sadb_x_kmaddress) +
3481                     pfkey_sockaddr_pair_size(family));
3482
3483         kma = skb_put_zero(skb, size_req);
3484         kma->sadb_x_kmaddress_len = size_req / 8;
3485         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3486         kma->sadb_x_kmaddress_reserved = k->reserved;
3487
3488         sa = (u8 *)(kma + 1);
3489         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3490             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3491                 return -EINVAL;
3492
3493         return 0;
3494 }
3495
3496 static int set_ipsecrequest(struct sk_buff *skb,
3497                             uint8_t proto, uint8_t mode, int level,
3498                             uint32_t reqid, uint8_t family,
3499                             const xfrm_address_t *src, const xfrm_address_t *dst)
3500 {
3501         struct sadb_x_ipsecrequest *rq;
3502         u8 *sa;
3503         int socklen = pfkey_sockaddr_len(family);
3504         int size_req;
3505
3506         size_req = sizeof(struct sadb_x_ipsecrequest) +
3507                    pfkey_sockaddr_pair_size(family);
3508
3509         rq = skb_put_zero(skb, size_req);
3510         rq->sadb_x_ipsecrequest_len = size_req;
3511         rq->sadb_x_ipsecrequest_proto = proto;
3512         rq->sadb_x_ipsecrequest_mode = mode;
3513         rq->sadb_x_ipsecrequest_level = level;
3514         rq->sadb_x_ipsecrequest_reqid = reqid;
3515
3516         sa = (u8 *) (rq + 1);
3517         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3518             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3519                 return -EINVAL;
3520
3521         return 0;
3522 }
3523 #endif
3524
3525 #ifdef CONFIG_NET_KEY_MIGRATE
3526 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3527                               const struct xfrm_migrate *m, int num_bundles,
3528                               const struct xfrm_kmaddress *k,
3529                               const struct xfrm_encap_tmpl *encap)
3530 {
3531         int i;
3532         int sasize_sel;
3533         int size = 0;
3534         int size_pol = 0;
3535         struct sk_buff *skb;
3536         struct sadb_msg *hdr;
3537         struct sadb_x_policy *pol;
3538         const struct xfrm_migrate *mp;
3539
3540         if (type != XFRM_POLICY_TYPE_MAIN)
3541                 return 0;
3542
3543         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3544                 return -EINVAL;
3545
3546         if (k != NULL) {
3547                 /* addresses for KM */
3548                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3549                                      pfkey_sockaddr_pair_size(k->family));
3550         }
3551
3552         /* selector */
3553         sasize_sel = pfkey_sockaddr_size(sel->family);
3554         if (!sasize_sel)
3555                 return -EINVAL;
3556         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3557
3558         /* policy info */
3559         size_pol += sizeof(struct sadb_x_policy);
3560
3561         /* ipsecrequests */
3562         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3563                 /* old locator pair */
3564                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3565                             pfkey_sockaddr_pair_size(mp->old_family);
3566                 /* new locator pair */
3567                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3568                             pfkey_sockaddr_pair_size(mp->new_family);
3569         }
3570
3571         size += sizeof(struct sadb_msg) + size_pol;
3572
3573         /* alloc buffer */
3574         skb = alloc_skb(size, GFP_ATOMIC);
3575         if (skb == NULL)
3576                 return -ENOMEM;
3577
3578         hdr = skb_put(skb, sizeof(struct sadb_msg));
3579         hdr->sadb_msg_version = PF_KEY_V2;
3580         hdr->sadb_msg_type = SADB_X_MIGRATE;
3581         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3582         hdr->sadb_msg_len = size / 8;
3583         hdr->sadb_msg_errno = 0;
3584         hdr->sadb_msg_reserved = 0;
3585         hdr->sadb_msg_seq = 0;
3586         hdr->sadb_msg_pid = 0;
3587
3588         /* Addresses to be used by KM for negotiation, if ext is available */
3589         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3590                 goto err;
3591
3592         /* selector src */
3593         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3594
3595         /* selector dst */
3596         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3597
3598         /* policy information */
3599         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3600         pol->sadb_x_policy_len = size_pol / 8;
3601         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3602         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3603         pol->sadb_x_policy_dir = dir + 1;
3604         pol->sadb_x_policy_reserved = 0;
3605         pol->sadb_x_policy_id = 0;
3606         pol->sadb_x_policy_priority = 0;
3607
3608         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3609                 /* old ipsecrequest */
3610                 int mode = pfkey_mode_from_xfrm(mp->mode);
3611                 if (mode < 0)
3612                         goto err;
3613                 if (set_ipsecrequest(skb, mp->proto, mode,
3614                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3615                                      mp->reqid, mp->old_family,
3616                                      &mp->old_saddr, &mp->old_daddr) < 0)
3617                         goto err;
3618
3619                 /* new ipsecrequest */
3620                 if (set_ipsecrequest(skb, mp->proto, mode,
3621                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3622                                      mp->reqid, mp->new_family,
3623                                      &mp->new_saddr, &mp->new_daddr) < 0)
3624                         goto err;
3625         }
3626
3627         /* broadcast migrate message to sockets */
3628         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3629
3630         return 0;
3631
3632 err:
3633         kfree_skb(skb);
3634         return -EINVAL;
3635 }
3636 #else
3637 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3638                               const struct xfrm_migrate *m, int num_bundles,
3639                               const struct xfrm_kmaddress *k,
3640                               const struct xfrm_encap_tmpl *encap)
3641 {
3642         return -ENOPROTOOPT;
3643 }
3644 #endif
3645
3646 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3647 {
3648         struct sock *sk = sock->sk;
3649         struct sk_buff *skb = NULL;
3650         struct sadb_msg *hdr = NULL;
3651         int err;
3652         struct net *net = sock_net(sk);
3653
3654         err = -EOPNOTSUPP;
3655         if (msg->msg_flags & MSG_OOB)
3656                 goto out;
3657
3658         err = -EMSGSIZE;
3659         if ((unsigned int)len > sk->sk_sndbuf - 32)
3660                 goto out;
3661
3662         err = -ENOBUFS;
3663         skb = alloc_skb(len, GFP_KERNEL);
3664         if (skb == NULL)
3665                 goto out;
3666
3667         err = -EFAULT;
3668         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3669                 goto out;
3670
3671         hdr = pfkey_get_base_msg(skb, &err);
3672         if (!hdr)
3673                 goto out;
3674
3675         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3676         err = pfkey_process(sk, skb, hdr);
3677         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3678
3679 out:
3680         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3681                 err = 0;
3682         kfree_skb(skb);
3683
3684         return err ? : len;
3685 }
3686
3687 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3688                          int flags)
3689 {
3690         struct sock *sk = sock->sk;
3691         struct pfkey_sock *pfk = pfkey_sk(sk);
3692         struct sk_buff *skb;
3693         int copied, err;
3694
3695         err = -EINVAL;
3696         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3697                 goto out;
3698
3699         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3700         if (skb == NULL)
3701                 goto out;
3702
3703         copied = skb->len;
3704         if (copied > len) {
3705                 msg->msg_flags |= MSG_TRUNC;
3706                 copied = len;
3707         }
3708
3709         skb_reset_transport_header(skb);
3710         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3711         if (err)
3712                 goto out_free;
3713
3714         sock_recv_ts_and_drops(msg, sk, skb);
3715
3716         err = (flags & MSG_TRUNC) ? skb->len : copied;
3717
3718         if (pfk->dump.dump != NULL &&
3719             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3720                 pfkey_do_dump(pfk);
3721
3722 out_free:
3723         skb_free_datagram(sk, skb);
3724 out:
3725         return err;
3726 }
3727
3728 static const struct proto_ops pfkey_ops = {
3729         .family         =       PF_KEY,
3730         .owner          =       THIS_MODULE,
3731         /* Operations that make no sense on pfkey sockets. */
3732         .bind           =       sock_no_bind,
3733         .connect        =       sock_no_connect,
3734         .socketpair     =       sock_no_socketpair,
3735         .accept         =       sock_no_accept,
3736         .getname        =       sock_no_getname,
3737         .ioctl          =       sock_no_ioctl,
3738         .listen         =       sock_no_listen,
3739         .shutdown       =       sock_no_shutdown,
3740         .mmap           =       sock_no_mmap,
3741         .sendpage       =       sock_no_sendpage,
3742
3743         /* Now the operations that really occur. */
3744         .release        =       pfkey_release,
3745         .poll           =       datagram_poll,
3746         .sendmsg        =       pfkey_sendmsg,
3747         .recvmsg        =       pfkey_recvmsg,
3748 };
3749
3750 static const struct net_proto_family pfkey_family_ops = {
3751         .family =       PF_KEY,
3752         .create =       pfkey_create,
3753         .owner  =       THIS_MODULE,
3754 };
3755
3756 #ifdef CONFIG_PROC_FS
3757 static int pfkey_seq_show(struct seq_file *f, void *v)
3758 {
3759         struct sock *s = sk_entry(v);
3760
3761         if (v == SEQ_START_TOKEN)
3762                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3763         else
3764                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3765                                s,
3766                                refcount_read(&s->sk_refcnt),
3767                                sk_rmem_alloc_get(s),
3768                                sk_wmem_alloc_get(s),
3769                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3770                                sock_i_ino(s)
3771                                );
3772         return 0;
3773 }
3774
3775 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3776         __acquires(rcu)
3777 {
3778         struct net *net = seq_file_net(f);
3779         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3780
3781         rcu_read_lock();
3782         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3783 }
3784
3785 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3786 {
3787         struct net *net = seq_file_net(f);
3788         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3789
3790         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3791 }
3792
3793 static void pfkey_seq_stop(struct seq_file *f, void *v)
3794         __releases(rcu)
3795 {
3796         rcu_read_unlock();
3797 }
3798
3799 static const struct seq_operations pfkey_seq_ops = {
3800         .start  = pfkey_seq_start,
3801         .next   = pfkey_seq_next,
3802         .stop   = pfkey_seq_stop,
3803         .show   = pfkey_seq_show,
3804 };
3805
3806 static int __net_init pfkey_init_proc(struct net *net)
3807 {
3808         struct proc_dir_entry *e;
3809
3810         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3811                         sizeof(struct seq_net_private));
3812         if (e == NULL)
3813                 return -ENOMEM;
3814
3815         return 0;
3816 }
3817
3818 static void __net_exit pfkey_exit_proc(struct net *net)
3819 {
3820         remove_proc_entry("pfkey", net->proc_net);
3821 }
3822 #else
3823 static inline int pfkey_init_proc(struct net *net)
3824 {
3825         return 0;
3826 }
3827
3828 static inline void pfkey_exit_proc(struct net *net)
3829 {
3830 }
3831 #endif
3832
3833 static struct xfrm_mgr pfkeyv2_mgr =
3834 {
3835         .notify         = pfkey_send_notify,
3836         .acquire        = pfkey_send_acquire,
3837         .compile_policy = pfkey_compile_policy,
3838         .new_mapping    = pfkey_send_new_mapping,
3839         .notify_policy  = pfkey_send_policy_notify,
3840         .migrate        = pfkey_send_migrate,
3841         .is_alive       = pfkey_is_alive,
3842 };
3843
3844 static int __net_init pfkey_net_init(struct net *net)
3845 {
3846         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3847         int rv;
3848
3849         INIT_HLIST_HEAD(&net_pfkey->table);
3850         atomic_set(&net_pfkey->socks_nr, 0);
3851
3852         rv = pfkey_init_proc(net);
3853
3854         return rv;
3855 }
3856
3857 static void __net_exit pfkey_net_exit(struct net *net)
3858 {
3859         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3860
3861         pfkey_exit_proc(net);
3862         WARN_ON(!hlist_empty(&net_pfkey->table));
3863 }
3864
3865 static struct pernet_operations pfkey_net_ops = {
3866         .init = pfkey_net_init,
3867         .exit = pfkey_net_exit,
3868         .id   = &pfkey_net_id,
3869         .size = sizeof(struct netns_pfkey),
3870 };
3871
3872 static void __exit ipsec_pfkey_exit(void)
3873 {
3874         xfrm_unregister_km(&pfkeyv2_mgr);
3875         sock_unregister(PF_KEY);
3876         unregister_pernet_subsys(&pfkey_net_ops);
3877         proto_unregister(&key_proto);
3878 }
3879
3880 static int __init ipsec_pfkey_init(void)
3881 {
3882         int err = proto_register(&key_proto, 0);
3883
3884         if (err != 0)
3885                 goto out;
3886
3887         err = register_pernet_subsys(&pfkey_net_ops);
3888         if (err != 0)
3889                 goto out_unregister_key_proto;
3890         err = sock_register(&pfkey_family_ops);
3891         if (err != 0)
3892                 goto out_unregister_pernet;
3893         err = xfrm_register_km(&pfkeyv2_mgr);
3894         if (err != 0)
3895                 goto out_sock_unregister;
3896 out:
3897         return err;
3898
3899 out_sock_unregister:
3900         sock_unregister(PF_KEY);
3901 out_unregister_pernet:
3902         unregister_pernet_subsys(&pfkey_net_ops);
3903 out_unregister_key_proto:
3904         proto_unregister(&key_proto);
3905         goto out;
3906 }
3907
3908 module_init(ipsec_pfkey_init);
3909 module_exit(ipsec_pfkey_exit);
3910 MODULE_LICENSE("GPL");
3911 MODULE_ALIAS_NETPROTO(PF_KEY);