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         mutex_lock(&pfkey_mutex);
1701         xfrm_probe_algs();
1702
1703         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1704         mutex_unlock(&pfkey_mutex);
1705
1706         if (!supp_skb) {
1707                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1708                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1709
1710                 return -ENOBUFS;
1711         }
1712
1713         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1714                         sock_net(sk));
1715         return 0;
1716 }
1717
1718 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1719 {
1720         struct sk_buff *skb;
1721         struct sadb_msg *hdr;
1722
1723         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1724         if (!skb)
1725                 return -ENOBUFS;
1726
1727         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1728         hdr->sadb_msg_errno = (uint8_t) 0;
1729         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1730
1731         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1732                                sock_net(sk));
1733 }
1734
1735 static int key_notify_sa_flush(const struct km_event *c)
1736 {
1737         struct sk_buff *skb;
1738         struct sadb_msg *hdr;
1739
1740         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1741         if (!skb)
1742                 return -ENOBUFS;
1743         hdr = skb_put(skb, sizeof(struct sadb_msg));
1744         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1745         hdr->sadb_msg_type = SADB_FLUSH;
1746         hdr->sadb_msg_seq = c->seq;
1747         hdr->sadb_msg_pid = c->portid;
1748         hdr->sadb_msg_version = PF_KEY_V2;
1749         hdr->sadb_msg_errno = (uint8_t) 0;
1750         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1751         hdr->sadb_msg_reserved = 0;
1752
1753         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1754
1755         return 0;
1756 }
1757
1758 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1759 {
1760         struct net *net = sock_net(sk);
1761         unsigned int proto;
1762         struct km_event c;
1763         int err, err2;
1764
1765         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1766         if (proto == 0)
1767                 return -EINVAL;
1768
1769         err = xfrm_state_flush(net, proto, true, false);
1770         err2 = unicast_flush_resp(sk, hdr);
1771         if (err || err2) {
1772                 if (err == -ESRCH) /* empty table - go quietly */
1773                         err = 0;
1774                 return err ? err : err2;
1775         }
1776
1777         c.data.proto = proto;
1778         c.seq = hdr->sadb_msg_seq;
1779         c.portid = hdr->sadb_msg_pid;
1780         c.event = XFRM_MSG_FLUSHSA;
1781         c.net = net;
1782         km_state_notify(NULL, &c);
1783
1784         return 0;
1785 }
1786
1787 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1788 {
1789         struct pfkey_sock *pfk = ptr;
1790         struct sk_buff *out_skb;
1791         struct sadb_msg *out_hdr;
1792
1793         if (!pfkey_can_dump(&pfk->sk))
1794                 return -ENOBUFS;
1795
1796         out_skb = pfkey_xfrm_state2msg(x);
1797         if (IS_ERR(out_skb))
1798                 return PTR_ERR(out_skb);
1799
1800         out_hdr = (struct sadb_msg *) out_skb->data;
1801         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1802         out_hdr->sadb_msg_type = SADB_DUMP;
1803         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1804         out_hdr->sadb_msg_errno = 0;
1805         out_hdr->sadb_msg_reserved = 0;
1806         out_hdr->sadb_msg_seq = count + 1;
1807         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1808
1809         if (pfk->dump.skb)
1810                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1811                                 &pfk->sk, sock_net(&pfk->sk));
1812         pfk->dump.skb = out_skb;
1813
1814         return 0;
1815 }
1816
1817 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1818 {
1819         struct net *net = sock_net(&pfk->sk);
1820         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1821 }
1822
1823 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1824 {
1825         struct net *net = sock_net(&pfk->sk);
1826
1827         xfrm_state_walk_done(&pfk->dump.u.state, net);
1828 }
1829
1830 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1831 {
1832         u8 proto;
1833         struct xfrm_address_filter *filter = NULL;
1834         struct pfkey_sock *pfk = pfkey_sk(sk);
1835
1836         mutex_lock(&pfk->dump_lock);
1837         if (pfk->dump.dump != NULL) {
1838                 mutex_unlock(&pfk->dump_lock);
1839                 return -EBUSY;
1840         }
1841
1842         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1843         if (proto == 0) {
1844                 mutex_unlock(&pfk->dump_lock);
1845                 return -EINVAL;
1846         }
1847
1848         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1849                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1850
1851                 if ((xfilter->sadb_x_filter_splen >=
1852                         (sizeof(xfrm_address_t) << 3)) ||
1853                     (xfilter->sadb_x_filter_dplen >=
1854                         (sizeof(xfrm_address_t) << 3))) {
1855                         mutex_unlock(&pfk->dump_lock);
1856                         return -EINVAL;
1857                 }
1858                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1859                 if (filter == NULL) {
1860                         mutex_unlock(&pfk->dump_lock);
1861                         return -ENOMEM;
1862                 }
1863
1864                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1865                        sizeof(xfrm_address_t));
1866                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1867                        sizeof(xfrm_address_t));
1868                 filter->family = xfilter->sadb_x_filter_family;
1869                 filter->splen = xfilter->sadb_x_filter_splen;
1870                 filter->dplen = xfilter->sadb_x_filter_dplen;
1871         }
1872
1873         pfk->dump.msg_version = hdr->sadb_msg_version;
1874         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1875         pfk->dump.dump = pfkey_dump_sa;
1876         pfk->dump.done = pfkey_dump_sa_done;
1877         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1878         mutex_unlock(&pfk->dump_lock);
1879
1880         return pfkey_do_dump(pfk);
1881 }
1882
1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1884 {
1885         struct pfkey_sock *pfk = pfkey_sk(sk);
1886         int satype = hdr->sadb_msg_satype;
1887         bool reset_errno = false;
1888
1889         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1890                 reset_errno = true;
1891                 if (satype != 0 && satype != 1)
1892                         return -EINVAL;
1893                 pfk->promisc = satype;
1894         }
1895         if (reset_errno && skb_cloned(skb))
1896                 skb = skb_copy(skb, GFP_KERNEL);
1897         else
1898                 skb = skb_clone(skb, GFP_KERNEL);
1899
1900         if (reset_errno && skb) {
1901                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1902                 new_hdr->sadb_msg_errno = 0;
1903         }
1904
1905         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1906         return 0;
1907 }
1908
1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1910 {
1911         int i;
1912         u32 reqid = *(u32*)ptr;
1913
1914         for (i=0; i<xp->xfrm_nr; i++) {
1915                 if (xp->xfrm_vec[i].reqid == reqid)
1916                         return -EEXIST;
1917         }
1918         return 0;
1919 }
1920
1921 static u32 gen_reqid(struct net *net)
1922 {
1923         struct xfrm_policy_walk walk;
1924         u32 start;
1925         int rc;
1926         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1927
1928         start = reqid;
1929         do {
1930                 ++reqid;
1931                 if (reqid == 0)
1932                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1933                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1934                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1935                 xfrm_policy_walk_done(&walk, net);
1936                 if (rc != -EEXIST)
1937                         return reqid;
1938         } while (reqid != start);
1939         return 0;
1940 }
1941
1942 static int
1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1944 {
1945         struct net *net = xp_net(xp);
1946         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947         int mode;
1948
1949         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950                 return -ELOOP;
1951
1952         if (rq->sadb_x_ipsecrequest_mode == 0)
1953                 return -EINVAL;
1954         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955                 return -EINVAL;
1956
1957         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959                 return -EINVAL;
1960         t->mode = mode;
1961         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1962                 t->optional = 1;
1963         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1964                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1965                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1966                         t->reqid = 0;
1967                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1968                         return -ENOBUFS;
1969         }
1970
1971         /* addresses present only in tunnel mode */
1972         if (t->mode == XFRM_MODE_TUNNEL) {
1973                 int err;
1974
1975                 err = parse_sockaddr_pair(
1976                         (struct sockaddr *)(rq + 1),
1977                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1978                         &t->saddr, &t->id.daddr, &t->encap_family);
1979                 if (err)
1980                         return err;
1981         } else
1982                 t->encap_family = xp->family;
1983
1984         /* No way to set this via kame pfkey */
1985         t->allalgs = 1;
1986         xp->xfrm_nr++;
1987         return 0;
1988 }
1989
1990 static int
1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1992 {
1993         int err;
1994         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1995         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1996
1997         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1998                 return -EINVAL;
1999
2000         while (len >= sizeof(*rq)) {
2001                 if (len < rq->sadb_x_ipsecrequest_len ||
2002                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2003                         return -EINVAL;
2004
2005                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2006                         return err;
2007                 len -= rq->sadb_x_ipsecrequest_len;
2008                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2009         }
2010         return 0;
2011 }
2012
2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2014 {
2015         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2016
2017         if (xfrm_ctx) {
2018                 int len = sizeof(struct sadb_x_sec_ctx);
2019                 len += xfrm_ctx->ctx_len;
2020                 return PFKEY_ALIGN8(len);
2021         }
2022         return 0;
2023 }
2024
2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2026 {
2027         const struct xfrm_tmpl *t;
2028         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2029         int socklen = 0;
2030         int i;
2031
2032         for (i=0; i<xp->xfrm_nr; i++) {
2033                 t = xp->xfrm_vec + i;
2034                 socklen += pfkey_sockaddr_len(t->encap_family);
2035         }
2036
2037         return sizeof(struct sadb_msg) +
2038                 (sizeof(struct sadb_lifetime) * 3) +
2039                 (sizeof(struct sadb_address) * 2) +
2040                 (sockaddr_size * 2) +
2041                 sizeof(struct sadb_x_policy) +
2042                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2043                 (socklen * 2) +
2044                 pfkey_xfrm_policy2sec_ctx_size(xp);
2045 }
2046
2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2048 {
2049         struct sk_buff *skb;
2050         int size;
2051
2052         size = pfkey_xfrm_policy2msg_size(xp);
2053
2054         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2055         if (skb == NULL)
2056                 return ERR_PTR(-ENOBUFS);
2057
2058         return skb;
2059 }
2060
2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2062 {
2063         struct sadb_msg *hdr;
2064         struct sadb_address *addr;
2065         struct sadb_lifetime *lifetime;
2066         struct sadb_x_policy *pol;
2067         struct sadb_x_sec_ctx *sec_ctx;
2068         struct xfrm_sec_ctx *xfrm_ctx;
2069         int i;
2070         int size;
2071         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2072         int socklen = pfkey_sockaddr_len(xp->family);
2073
2074         size = pfkey_xfrm_policy2msg_size(xp);
2075
2076         /* call should fill header later */
2077         hdr = skb_put(skb, sizeof(struct sadb_msg));
2078         memset(hdr, 0, size);   /* XXX do we need this ? */
2079
2080         /* src address */
2081         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2082         addr->sadb_address_len =
2083                 (sizeof(struct sadb_address)+sockaddr_size)/
2084                         sizeof(uint64_t);
2085         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2086         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2087         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2088         addr->sadb_address_reserved = 0;
2089         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2090                                  xp->selector.sport,
2091                                  (struct sockaddr *) (addr + 1),
2092                                  xp->family))
2093                 BUG();
2094
2095         /* dst address */
2096         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2097         addr->sadb_address_len =
2098                 (sizeof(struct sadb_address)+sockaddr_size)/
2099                         sizeof(uint64_t);
2100         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2101         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2102         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2103         addr->sadb_address_reserved = 0;
2104
2105         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2106                             (struct sockaddr *) (addr + 1),
2107                             xp->family);
2108
2109         /* hard time */
2110         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2111         lifetime->sadb_lifetime_len =
2112                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2113         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2114         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2115         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2116         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2117         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2118         /* soft time */
2119         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2120         lifetime->sadb_lifetime_len =
2121                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2122         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2123         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2124         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2125         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2126         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2127         /* current time */
2128         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2129         lifetime->sadb_lifetime_len =
2130                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2131         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2132         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2133         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2134         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2135         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2136
2137         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2138         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2139         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2140         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2141         if (xp->action == XFRM_POLICY_ALLOW) {
2142                 if (xp->xfrm_nr)
2143                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2144                 else
2145                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2146         }
2147         pol->sadb_x_policy_dir = dir+1;
2148         pol->sadb_x_policy_reserved = 0;
2149         pol->sadb_x_policy_id = xp->index;
2150         pol->sadb_x_policy_priority = xp->priority;
2151
2152         for (i=0; i<xp->xfrm_nr; i++) {
2153                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2154                 struct sadb_x_ipsecrequest *rq;
2155                 int req_size;
2156                 int mode;
2157
2158                 req_size = sizeof(struct sadb_x_ipsecrequest);
2159                 if (t->mode == XFRM_MODE_TUNNEL) {
2160                         socklen = pfkey_sockaddr_len(t->encap_family);
2161                         req_size += socklen * 2;
2162                 } else {
2163                         size -= 2*socklen;
2164                 }
2165                 rq = skb_put(skb, req_size);
2166                 pol->sadb_x_policy_len += req_size/8;
2167                 memset(rq, 0, sizeof(*rq));
2168                 rq->sadb_x_ipsecrequest_len = req_size;
2169                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2170                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2171                         return -EINVAL;
2172                 rq->sadb_x_ipsecrequest_mode = mode;
2173                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2174                 if (t->reqid)
2175                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2176                 if (t->optional)
2177                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2178                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2179
2180                 if (t->mode == XFRM_MODE_TUNNEL) {
2181                         u8 *sa = (void *)(rq + 1);
2182                         pfkey_sockaddr_fill(&t->saddr, 0,
2183                                             (struct sockaddr *)sa,
2184                                             t->encap_family);
2185                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2186                                             (struct sockaddr *) (sa + socklen),
2187                                             t->encap_family);
2188                 }
2189         }
2190
2191         /* security context */
2192         if ((xfrm_ctx = xp->security)) {
2193                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2194
2195                 sec_ctx = skb_put(skb, ctx_size);
2196                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2197                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2198                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2199                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2200                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2201                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2202                        xfrm_ctx->ctx_len);
2203         }
2204
2205         hdr->sadb_msg_len = size / sizeof(uint64_t);
2206         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2207
2208         return 0;
2209 }
2210
2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2212 {
2213         struct sk_buff *out_skb;
2214         struct sadb_msg *out_hdr;
2215         int err;
2216
2217         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2218         if (IS_ERR(out_skb))
2219                 return PTR_ERR(out_skb);
2220
2221         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2222         if (err < 0) {
2223                 kfree_skb(out_skb);
2224                 return err;
2225         }
2226
2227         out_hdr = (struct sadb_msg *) out_skb->data;
2228         out_hdr->sadb_msg_version = PF_KEY_V2;
2229
2230         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2231                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2232         else
2233                 out_hdr->sadb_msg_type = event2poltype(c->event);
2234         out_hdr->sadb_msg_errno = 0;
2235         out_hdr->sadb_msg_seq = c->seq;
2236         out_hdr->sadb_msg_pid = c->portid;
2237         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2238         return 0;
2239
2240 }
2241
2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2243 {
2244         struct net *net = sock_net(sk);
2245         int err = 0;
2246         struct sadb_lifetime *lifetime;
2247         struct sadb_address *sa;
2248         struct sadb_x_policy *pol;
2249         struct xfrm_policy *xp;
2250         struct km_event c;
2251         struct sadb_x_sec_ctx *sec_ctx;
2252
2253         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2254                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2255             !ext_hdrs[SADB_X_EXT_POLICY-1])
2256                 return -EINVAL;
2257
2258         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2259         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2260                 return -EINVAL;
2261         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2262                 return -EINVAL;
2263
2264         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2265         if (xp == NULL)
2266                 return -ENOBUFS;
2267
2268         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2269                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2270         xp->priority = pol->sadb_x_policy_priority;
2271
2272         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2273         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2274         xp->selector.family = xp->family;
2275         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2276         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2277         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2278         if (xp->selector.sport)
2279                 xp->selector.sport_mask = htons(0xffff);
2280
2281         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2282         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2283         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2284
2285         /* Amusing, we set this twice.  KAME apps appear to set same value
2286          * in both addresses.
2287          */
2288         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2289
2290         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2291         if (xp->selector.dport)
2292                 xp->selector.dport_mask = htons(0xffff);
2293
2294         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2295         if (sec_ctx != NULL) {
2296                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2297
2298                 if (!uctx) {
2299                         err = -ENOBUFS;
2300                         goto out;
2301                 }
2302
2303                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2304                 kfree(uctx);
2305
2306                 if (err)
2307                         goto out;
2308         }
2309
2310         xp->lft.soft_byte_limit = XFRM_INF;
2311         xp->lft.hard_byte_limit = XFRM_INF;
2312         xp->lft.soft_packet_limit = XFRM_INF;
2313         xp->lft.hard_packet_limit = XFRM_INF;
2314         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2315                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2316                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2317                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2318                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2319         }
2320         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2321                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2322                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2323                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2324                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2325         }
2326         xp->xfrm_nr = 0;
2327         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2328             (err = parse_ipsecrequests(xp, pol)) < 0)
2329                 goto out;
2330
2331         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2332                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2333
2334         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2335
2336         if (err)
2337                 goto out;
2338
2339         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2340                 c.event = XFRM_MSG_UPDPOLICY;
2341         else
2342                 c.event = XFRM_MSG_NEWPOLICY;
2343
2344         c.seq = hdr->sadb_msg_seq;
2345         c.portid = hdr->sadb_msg_pid;
2346
2347         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2348         xfrm_pol_put(xp);
2349         return 0;
2350
2351 out:
2352         xp->walk.dead = 1;
2353         xfrm_policy_destroy(xp);
2354         return err;
2355 }
2356
2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2358 {
2359         struct net *net = sock_net(sk);
2360         int err;
2361         struct sadb_address *sa;
2362         struct sadb_x_policy *pol;
2363         struct xfrm_policy *xp;
2364         struct xfrm_selector sel;
2365         struct km_event c;
2366         struct sadb_x_sec_ctx *sec_ctx;
2367         struct xfrm_sec_ctx *pol_ctx = NULL;
2368
2369         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2370                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2371             !ext_hdrs[SADB_X_EXT_POLICY-1])
2372                 return -EINVAL;
2373
2374         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2375         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2376                 return -EINVAL;
2377
2378         memset(&sel, 0, sizeof(sel));
2379
2380         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2381         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2382         sel.prefixlen_s = sa->sadb_address_prefixlen;
2383         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2384         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2385         if (sel.sport)
2386                 sel.sport_mask = htons(0xffff);
2387
2388         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2389         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2390         sel.prefixlen_d = sa->sadb_address_prefixlen;
2391         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393         if (sel.dport)
2394                 sel.dport_mask = htons(0xffff);
2395
2396         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2397         if (sec_ctx != NULL) {
2398                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2399
2400                 if (!uctx)
2401                         return -ENOMEM;
2402
2403                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2404                 kfree(uctx);
2405                 if (err)
2406                         return err;
2407         }
2408
2409         xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2410                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2411                                    1, &err);
2412         security_xfrm_policy_free(pol_ctx);
2413         if (xp == NULL)
2414                 return -ENOENT;
2415
2416         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2417
2418         if (err)
2419                 goto out;
2420
2421         c.seq = hdr->sadb_msg_seq;
2422         c.portid = hdr->sadb_msg_pid;
2423         c.data.byid = 0;
2424         c.event = XFRM_MSG_DELPOLICY;
2425         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2426
2427 out:
2428         xfrm_pol_put(xp);
2429         return err;
2430 }
2431
2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2433 {
2434         int err;
2435         struct sk_buff *out_skb;
2436         struct sadb_msg *out_hdr;
2437         err = 0;
2438
2439         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2440         if (IS_ERR(out_skb)) {
2441                 err =  PTR_ERR(out_skb);
2442                 goto out;
2443         }
2444         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2445         if (err < 0) {
2446                 kfree_skb(out_skb);
2447                 goto out;
2448         }
2449
2450         out_hdr = (struct sadb_msg *) out_skb->data;
2451         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2452         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2453         out_hdr->sadb_msg_satype = 0;
2454         out_hdr->sadb_msg_errno = 0;
2455         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2456         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2457         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2458         err = 0;
2459
2460 out:
2461         return err;
2462 }
2463
2464 static int pfkey_sockaddr_pair_size(sa_family_t family)
2465 {
2466         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2467 }
2468
2469 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2470                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2471                                u16 *family)
2472 {
2473         int af, socklen;
2474
2475         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2476                 return -EINVAL;
2477
2478         af = pfkey_sockaddr_extract(sa, saddr);
2479         if (!af)
2480                 return -EINVAL;
2481
2482         socklen = pfkey_sockaddr_len(af);
2483         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2484                                    daddr) != af)
2485                 return -EINVAL;
2486
2487         *family = af;
2488         return 0;
2489 }
2490
2491 #ifdef CONFIG_NET_KEY_MIGRATE
2492 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2493                                     struct xfrm_migrate *m)
2494 {
2495         int err;
2496         struct sadb_x_ipsecrequest *rq2;
2497         int mode;
2498
2499         if (len < sizeof(*rq1) ||
2500             len < rq1->sadb_x_ipsecrequest_len ||
2501             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2502                 return -EINVAL;
2503
2504         /* old endoints */
2505         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2506                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2507                                   &m->old_saddr, &m->old_daddr,
2508                                   &m->old_family);
2509         if (err)
2510                 return err;
2511
2512         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2513         len -= rq1->sadb_x_ipsecrequest_len;
2514
2515         if (len <= sizeof(*rq2) ||
2516             len < rq2->sadb_x_ipsecrequest_len ||
2517             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2518                 return -EINVAL;
2519
2520         /* new endpoints */
2521         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2522                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2523                                   &m->new_saddr, &m->new_daddr,
2524                                   &m->new_family);
2525         if (err)
2526                 return err;
2527
2528         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2529             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2530             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2531                 return -EINVAL;
2532
2533         m->proto = rq1->sadb_x_ipsecrequest_proto;
2534         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2535                 return -EINVAL;
2536         m->mode = mode;
2537         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2538
2539         return ((int)(rq1->sadb_x_ipsecrequest_len +
2540                       rq2->sadb_x_ipsecrequest_len));
2541 }
2542
2543 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2544                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2545 {
2546         int i, len, ret, err = -EINVAL;
2547         u8 dir;
2548         struct sadb_address *sa;
2549         struct sadb_x_kmaddress *kma;
2550         struct sadb_x_policy *pol;
2551         struct sadb_x_ipsecrequest *rq;
2552         struct xfrm_selector sel;
2553         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2554         struct xfrm_kmaddress k;
2555         struct net *net = sock_net(sk);
2556
2557         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2558                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2559             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2560                 err = -EINVAL;
2561                 goto out;
2562         }
2563
2564         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2565         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2566
2567         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2568                 err = -EINVAL;
2569                 goto out;
2570         }
2571
2572         if (kma) {
2573                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2574                 k.reserved = kma->sadb_x_kmaddress_reserved;
2575                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2576                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2577                                           &k.local, &k.remote, &k.family);
2578                 if (ret < 0) {
2579                         err = ret;
2580                         goto out;
2581                 }
2582         }
2583
2584         dir = pol->sadb_x_policy_dir - 1;
2585         memset(&sel, 0, sizeof(sel));
2586
2587         /* set source address info of selector */
2588         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2589         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2590         sel.prefixlen_s = sa->sadb_address_prefixlen;
2591         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2592         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2593         if (sel.sport)
2594                 sel.sport_mask = htons(0xffff);
2595
2596         /* set destination address info of selector */
2597         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2598         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2599         sel.prefixlen_d = sa->sadb_address_prefixlen;
2600         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2601         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2602         if (sel.dport)
2603                 sel.dport_mask = htons(0xffff);
2604
2605         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2606
2607         /* extract ipsecrequests */
2608         i = 0;
2609         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2610
2611         while (len > 0 && i < XFRM_MAX_DEPTH) {
2612                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2613                 if (ret < 0) {
2614                         err = ret;
2615                         goto out;
2616                 } else {
2617                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2618                         len -= ret;
2619                         i++;
2620                 }
2621         }
2622
2623         if (!i || len > 0) {
2624                 err = -EINVAL;
2625                 goto out;
2626         }
2627
2628         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2629                             kma ? &k : NULL, net, NULL, 0);
2630
2631  out:
2632         return err;
2633 }
2634 #else
2635 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2636                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2637 {
2638         return -ENOPROTOOPT;
2639 }
2640 #endif
2641
2642
2643 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2644 {
2645         struct net *net = sock_net(sk);
2646         unsigned int dir;
2647         int err = 0, delete;
2648         struct sadb_x_policy *pol;
2649         struct xfrm_policy *xp;
2650         struct km_event c;
2651
2652         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2653                 return -EINVAL;
2654
2655         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2656         if (dir >= XFRM_POLICY_MAX)
2657                 return -EINVAL;
2658
2659         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2660         xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2661                               dir, pol->sadb_x_policy_id, delete, &err);
2662         if (xp == NULL)
2663                 return -ENOENT;
2664
2665         if (delete) {
2666                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2667
2668                 if (err)
2669                         goto out;
2670                 c.seq = hdr->sadb_msg_seq;
2671                 c.portid = hdr->sadb_msg_pid;
2672                 c.data.byid = 1;
2673                 c.event = XFRM_MSG_DELPOLICY;
2674                 km_policy_notify(xp, dir, &c);
2675         } else {
2676                 err = key_pol_get_resp(sk, xp, hdr, dir);
2677         }
2678
2679 out:
2680         xfrm_pol_put(xp);
2681         return err;
2682 }
2683
2684 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2685 {
2686         struct pfkey_sock *pfk = ptr;
2687         struct sk_buff *out_skb;
2688         struct sadb_msg *out_hdr;
2689         int err;
2690
2691         if (!pfkey_can_dump(&pfk->sk))
2692                 return -ENOBUFS;
2693
2694         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2695         if (IS_ERR(out_skb))
2696                 return PTR_ERR(out_skb);
2697
2698         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2699         if (err < 0) {
2700                 kfree_skb(out_skb);
2701                 return err;
2702         }
2703
2704         out_hdr = (struct sadb_msg *) out_skb->data;
2705         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2706         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2707         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2708         out_hdr->sadb_msg_errno = 0;
2709         out_hdr->sadb_msg_seq = count + 1;
2710         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2711
2712         if (pfk->dump.skb)
2713                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2714                                 &pfk->sk, sock_net(&pfk->sk));
2715         pfk->dump.skb = out_skb;
2716
2717         return 0;
2718 }
2719
2720 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2721 {
2722         struct net *net = sock_net(&pfk->sk);
2723         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2724 }
2725
2726 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2727 {
2728         struct net *net = sock_net((struct sock *)pfk);
2729
2730         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2731 }
2732
2733 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2734 {
2735         struct pfkey_sock *pfk = pfkey_sk(sk);
2736
2737         mutex_lock(&pfk->dump_lock);
2738         if (pfk->dump.dump != NULL) {
2739                 mutex_unlock(&pfk->dump_lock);
2740                 return -EBUSY;
2741         }
2742
2743         pfk->dump.msg_version = hdr->sadb_msg_version;
2744         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2745         pfk->dump.dump = pfkey_dump_sp;
2746         pfk->dump.done = pfkey_dump_sp_done;
2747         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2748         mutex_unlock(&pfk->dump_lock);
2749
2750         return pfkey_do_dump(pfk);
2751 }
2752
2753 static int key_notify_policy_flush(const struct km_event *c)
2754 {
2755         struct sk_buff *skb_out;
2756         struct sadb_msg *hdr;
2757
2758         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2759         if (!skb_out)
2760                 return -ENOBUFS;
2761         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2762         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2763         hdr->sadb_msg_seq = c->seq;
2764         hdr->sadb_msg_pid = c->portid;
2765         hdr->sadb_msg_version = PF_KEY_V2;
2766         hdr->sadb_msg_errno = (uint8_t) 0;
2767         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2768         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2769         hdr->sadb_msg_reserved = 0;
2770         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2771         return 0;
2772
2773 }
2774
2775 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2776 {
2777         struct net *net = sock_net(sk);
2778         struct km_event c;
2779         int err, err2;
2780
2781         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2782         err2 = unicast_flush_resp(sk, hdr);
2783         if (err || err2) {
2784                 if (err == -ESRCH) /* empty table - old silent behavior */
2785                         return 0;
2786                 return err;
2787         }
2788
2789         c.data.type = XFRM_POLICY_TYPE_MAIN;
2790         c.event = XFRM_MSG_FLUSHPOLICY;
2791         c.portid = hdr->sadb_msg_pid;
2792         c.seq = hdr->sadb_msg_seq;
2793         c.net = net;
2794         km_policy_notify(NULL, 0, &c);
2795
2796         return 0;
2797 }
2798
2799 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2800                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2801 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2802         [SADB_RESERVED]         = pfkey_reserved,
2803         [SADB_GETSPI]           = pfkey_getspi,
2804         [SADB_UPDATE]           = pfkey_add,
2805         [SADB_ADD]              = pfkey_add,
2806         [SADB_DELETE]           = pfkey_delete,
2807         [SADB_GET]              = pfkey_get,
2808         [SADB_ACQUIRE]          = pfkey_acquire,
2809         [SADB_REGISTER]         = pfkey_register,
2810         [SADB_EXPIRE]           = NULL,
2811         [SADB_FLUSH]            = pfkey_flush,
2812         [SADB_DUMP]             = pfkey_dump,
2813         [SADB_X_PROMISC]        = pfkey_promisc,
2814         [SADB_X_PCHANGE]        = NULL,
2815         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2816         [SADB_X_SPDADD]         = pfkey_spdadd,
2817         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2818         [SADB_X_SPDGET]         = pfkey_spdget,
2819         [SADB_X_SPDACQUIRE]     = NULL,
2820         [SADB_X_SPDDUMP]        = pfkey_spddump,
2821         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2822         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2823         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2824         [SADB_X_MIGRATE]        = pfkey_migrate,
2825 };
2826
2827 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2828 {
2829         void *ext_hdrs[SADB_EXT_MAX];
2830         int err;
2831
2832         /* Non-zero return value of pfkey_broadcast() does not always signal
2833          * an error and even on an actual error we may still want to process
2834          * the message so rather ignore the return value.
2835          */
2836         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2837                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2838
2839         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2840         err = parse_exthdrs(skb, hdr, ext_hdrs);
2841         if (!err) {
2842                 err = -EOPNOTSUPP;
2843                 if (pfkey_funcs[hdr->sadb_msg_type])
2844                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2845         }
2846         return err;
2847 }
2848
2849 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2850 {
2851         struct sadb_msg *hdr = NULL;
2852
2853         if (skb->len < sizeof(*hdr)) {
2854                 *errp = -EMSGSIZE;
2855         } else {
2856                 hdr = (struct sadb_msg *) skb->data;
2857                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2858                     hdr->sadb_msg_reserved != 0 ||
2859                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2860                      hdr->sadb_msg_type > SADB_MAX)) {
2861                         hdr = NULL;
2862                         *errp = -EINVAL;
2863                 } else if (hdr->sadb_msg_len != (skb->len /
2864                                                  sizeof(uint64_t)) ||
2865                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2866                                                 sizeof(uint64_t))) {
2867                         hdr = NULL;
2868                         *errp = -EMSGSIZE;
2869                 } else {
2870                         *errp = 0;
2871                 }
2872         }
2873         return hdr;
2874 }
2875
2876 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2877                                 const struct xfrm_algo_desc *d)
2878 {
2879         unsigned int id = d->desc.sadb_alg_id;
2880
2881         if (id >= sizeof(t->aalgos) * 8)
2882                 return 0;
2883
2884         return (t->aalgos >> id) & 1;
2885 }
2886
2887 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2888                                 const struct xfrm_algo_desc *d)
2889 {
2890         unsigned int id = d->desc.sadb_alg_id;
2891
2892         if (id >= sizeof(t->ealgos) * 8)
2893                 return 0;
2894
2895         return (t->ealgos >> id) & 1;
2896 }
2897
2898 static int count_ah_combs(const struct xfrm_tmpl *t)
2899 {
2900         int i, sz = 0;
2901
2902         for (i = 0; ; i++) {
2903                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2904                 if (!aalg)
2905                         break;
2906                 if (!aalg->pfkey_supported)
2907                         continue;
2908                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2909                         sz += sizeof(struct sadb_comb);
2910         }
2911         return sz + sizeof(struct sadb_prop);
2912 }
2913
2914 static int count_esp_combs(const struct xfrm_tmpl *t)
2915 {
2916         int i, k, sz = 0;
2917
2918         for (i = 0; ; i++) {
2919                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920                 if (!ealg)
2921                         break;
2922
2923                 if (!ealg->pfkey_supported)
2924                         continue;
2925
2926                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927                         continue;
2928
2929                 for (k = 1; ; k++) {
2930                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931                         if (!aalg)
2932                                 break;
2933
2934                         if (!aalg->pfkey_supported)
2935                                 continue;
2936
2937                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2938                                 sz += sizeof(struct sadb_comb);
2939                 }
2940         }
2941         return sz + sizeof(struct sadb_prop);
2942 }
2943
2944 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2945 {
2946         struct sadb_prop *p;
2947         int i;
2948
2949         p = skb_put(skb, sizeof(struct sadb_prop));
2950         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2951         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2952         p->sadb_prop_replay = 32;
2953         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2954
2955         for (i = 0; ; i++) {
2956                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2957                 if (!aalg)
2958                         break;
2959
2960                 if (!aalg->pfkey_supported)
2961                         continue;
2962
2963                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2964                         struct sadb_comb *c;
2965                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2966                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2967                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2968                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2969                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2970                         c->sadb_comb_hard_addtime = 24*60*60;
2971                         c->sadb_comb_soft_addtime = 20*60*60;
2972                         c->sadb_comb_hard_usetime = 8*60*60;
2973                         c->sadb_comb_soft_usetime = 7*60*60;
2974                 }
2975         }
2976 }
2977
2978 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2979 {
2980         struct sadb_prop *p;
2981         int i, k;
2982
2983         p = skb_put(skb, sizeof(struct sadb_prop));
2984         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2985         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2986         p->sadb_prop_replay = 32;
2987         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2988
2989         for (i=0; ; i++) {
2990                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2991                 if (!ealg)
2992                         break;
2993
2994                 if (!ealg->pfkey_supported)
2995                         continue;
2996
2997                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2998                         continue;
2999
3000                 for (k = 1; ; k++) {
3001                         struct sadb_comb *c;
3002                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3003                         if (!aalg)
3004                                 break;
3005                         if (!aalg->pfkey_supported)
3006                                 continue;
3007                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3008                                 continue;
3009                         c = skb_put(skb, sizeof(struct sadb_comb));
3010                         memset(c, 0, sizeof(*c));
3011                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3012                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3013                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3014                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3015                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3016                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3017                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3018                         c->sadb_comb_hard_addtime = 24*60*60;
3019                         c->sadb_comb_soft_addtime = 20*60*60;
3020                         c->sadb_comb_hard_usetime = 8*60*60;
3021                         c->sadb_comb_soft_usetime = 7*60*60;
3022                 }
3023         }
3024 }
3025
3026 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3027 {
3028         return 0;
3029 }
3030
3031 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3032 {
3033         struct sk_buff *out_skb;
3034         struct sadb_msg *out_hdr;
3035         int hard;
3036         int hsc;
3037
3038         hard = c->data.hard;
3039         if (hard)
3040                 hsc = 2;
3041         else
3042                 hsc = 1;
3043
3044         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3045         if (IS_ERR(out_skb))
3046                 return PTR_ERR(out_skb);
3047
3048         out_hdr = (struct sadb_msg *) out_skb->data;
3049         out_hdr->sadb_msg_version = PF_KEY_V2;
3050         out_hdr->sadb_msg_type = SADB_EXPIRE;
3051         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3052         out_hdr->sadb_msg_errno = 0;
3053         out_hdr->sadb_msg_reserved = 0;
3054         out_hdr->sadb_msg_seq = 0;
3055         out_hdr->sadb_msg_pid = 0;
3056
3057         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3058                         xs_net(x));
3059         return 0;
3060 }
3061
3062 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3063 {
3064         struct net *net = x ? xs_net(x) : c->net;
3065         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3066
3067         if (atomic_read(&net_pfkey->socks_nr) == 0)
3068                 return 0;
3069
3070         switch (c->event) {
3071         case XFRM_MSG_EXPIRE:
3072                 return key_notify_sa_expire(x, c);
3073         case XFRM_MSG_DELSA:
3074         case XFRM_MSG_NEWSA:
3075         case XFRM_MSG_UPDSA:
3076                 return key_notify_sa(x, c);
3077         case XFRM_MSG_FLUSHSA:
3078                 return key_notify_sa_flush(c);
3079         case XFRM_MSG_NEWAE: /* not yet supported */
3080                 break;
3081         default:
3082                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3083                 break;
3084         }
3085
3086         return 0;
3087 }
3088
3089 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3090 {
3091         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3092                 return 0;
3093
3094         switch (c->event) {
3095         case XFRM_MSG_POLEXPIRE:
3096                 return key_notify_policy_expire(xp, c);
3097         case XFRM_MSG_DELPOLICY:
3098         case XFRM_MSG_NEWPOLICY:
3099         case XFRM_MSG_UPDPOLICY:
3100                 return key_notify_policy(xp, dir, c);
3101         case XFRM_MSG_FLUSHPOLICY:
3102                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3103                         break;
3104                 return key_notify_policy_flush(c);
3105         default:
3106                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3107                 break;
3108         }
3109
3110         return 0;
3111 }
3112
3113 static u32 get_acqseq(void)
3114 {
3115         u32 res;
3116         static atomic_t acqseq;
3117
3118         do {
3119                 res = atomic_inc_return(&acqseq);
3120         } while (!res);
3121         return res;
3122 }
3123
3124 static bool pfkey_is_alive(const struct km_event *c)
3125 {
3126         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3127         struct sock *sk;
3128         bool is_alive = false;
3129
3130         rcu_read_lock();
3131         sk_for_each_rcu(sk, &net_pfkey->table) {
3132                 if (pfkey_sk(sk)->registered) {
3133                         is_alive = true;
3134                         break;
3135                 }
3136         }
3137         rcu_read_unlock();
3138
3139         return is_alive;
3140 }
3141
3142 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3143 {
3144         struct sk_buff *skb;
3145         struct sadb_msg *hdr;
3146         struct sadb_address *addr;
3147         struct sadb_x_policy *pol;
3148         int sockaddr_size;
3149         int size;
3150         struct sadb_x_sec_ctx *sec_ctx;
3151         struct xfrm_sec_ctx *xfrm_ctx;
3152         int ctx_size = 0;
3153
3154         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3155         if (!sockaddr_size)
3156                 return -EINVAL;
3157
3158         size = sizeof(struct sadb_msg) +
3159                 (sizeof(struct sadb_address) * 2) +
3160                 (sockaddr_size * 2) +
3161                 sizeof(struct sadb_x_policy);
3162
3163         if (x->id.proto == IPPROTO_AH)
3164                 size += count_ah_combs(t);
3165         else if (x->id.proto == IPPROTO_ESP)
3166                 size += count_esp_combs(t);
3167
3168         if ((xfrm_ctx = x->security)) {
3169                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3170                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3171         }
3172
3173         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3174         if (skb == NULL)
3175                 return -ENOMEM;
3176
3177         hdr = skb_put(skb, sizeof(struct sadb_msg));
3178         hdr->sadb_msg_version = PF_KEY_V2;
3179         hdr->sadb_msg_type = SADB_ACQUIRE;
3180         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3181         hdr->sadb_msg_len = size / sizeof(uint64_t);
3182         hdr->sadb_msg_errno = 0;
3183         hdr->sadb_msg_reserved = 0;
3184         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3185         hdr->sadb_msg_pid = 0;
3186
3187         /* src address */
3188         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3189         addr->sadb_address_len =
3190                 (sizeof(struct sadb_address)+sockaddr_size)/
3191                         sizeof(uint64_t);
3192         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3193         addr->sadb_address_proto = 0;
3194         addr->sadb_address_reserved = 0;
3195         addr->sadb_address_prefixlen =
3196                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3197                                     (struct sockaddr *) (addr + 1),
3198                                     x->props.family);
3199         if (!addr->sadb_address_prefixlen)
3200                 BUG();
3201
3202         /* dst address */
3203         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3204         addr->sadb_address_len =
3205                 (sizeof(struct sadb_address)+sockaddr_size)/
3206                         sizeof(uint64_t);
3207         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3208         addr->sadb_address_proto = 0;
3209         addr->sadb_address_reserved = 0;
3210         addr->sadb_address_prefixlen =
3211                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3212                                     (struct sockaddr *) (addr + 1),
3213                                     x->props.family);
3214         if (!addr->sadb_address_prefixlen)
3215                 BUG();
3216
3217         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3218         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3219         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3220         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3221         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3222         pol->sadb_x_policy_reserved = 0;
3223         pol->sadb_x_policy_id = xp->index;
3224         pol->sadb_x_policy_priority = xp->priority;
3225
3226         /* Set sadb_comb's. */
3227         if (x->id.proto == IPPROTO_AH)
3228                 dump_ah_combs(skb, t);
3229         else if (x->id.proto == IPPROTO_ESP)
3230                 dump_esp_combs(skb, t);
3231
3232         /* security context */
3233         if (xfrm_ctx) {
3234                 sec_ctx = skb_put(skb,
3235                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3236                 sec_ctx->sadb_x_sec_len =
3237                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3238                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3239                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3240                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3241                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3242                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3243                        xfrm_ctx->ctx_len);
3244         }
3245
3246         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3247                                xs_net(x));
3248 }
3249
3250 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3251                                                 u8 *data, int len, int *dir)
3252 {
3253         struct net *net = sock_net(sk);
3254         struct xfrm_policy *xp;
3255         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3256         struct sadb_x_sec_ctx *sec_ctx;
3257
3258         switch (sk->sk_family) {
3259         case AF_INET:
3260                 if (opt != IP_IPSEC_POLICY) {
3261                         *dir = -EOPNOTSUPP;
3262                         return NULL;
3263                 }
3264                 break;
3265 #if IS_ENABLED(CONFIG_IPV6)
3266         case AF_INET6:
3267                 if (opt != IPV6_IPSEC_POLICY) {
3268                         *dir = -EOPNOTSUPP;
3269                         return NULL;
3270                 }
3271                 break;
3272 #endif
3273         default:
3274                 *dir = -EINVAL;
3275                 return NULL;
3276         }
3277
3278         *dir = -EINVAL;
3279
3280         if (len < sizeof(struct sadb_x_policy) ||
3281             pol->sadb_x_policy_len*8 > len ||
3282             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3283             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3284                 return NULL;
3285
3286         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3287         if (xp == NULL) {
3288                 *dir = -ENOBUFS;
3289                 return NULL;
3290         }
3291
3292         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3293                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3294
3295         xp->lft.soft_byte_limit = XFRM_INF;
3296         xp->lft.hard_byte_limit = XFRM_INF;
3297         xp->lft.soft_packet_limit = XFRM_INF;
3298         xp->lft.hard_packet_limit = XFRM_INF;
3299         xp->family = sk->sk_family;
3300
3301         xp->xfrm_nr = 0;
3302         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3303             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3304                 goto out;
3305
3306         /* security context too */
3307         if (len >= (pol->sadb_x_policy_len*8 +
3308             sizeof(struct sadb_x_sec_ctx))) {
3309                 char *p = (char *)pol;
3310                 struct xfrm_user_sec_ctx *uctx;
3311
3312                 p += pol->sadb_x_policy_len*8;
3313                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3314                 if (len < pol->sadb_x_policy_len*8 +
3315                     sec_ctx->sadb_x_sec_len*8) {
3316                         *dir = -EINVAL;
3317                         goto out;
3318                 }
3319                 if ((*dir = verify_sec_ctx_len(p)))
3320                         goto out;
3321                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3322                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3323                 kfree(uctx);
3324
3325                 if (*dir)
3326                         goto out;
3327         }
3328
3329         *dir = pol->sadb_x_policy_dir-1;
3330         return xp;
3331
3332 out:
3333         xp->walk.dead = 1;
3334         xfrm_policy_destroy(xp);
3335         return NULL;
3336 }
3337
3338 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3339 {
3340         struct sk_buff *skb;
3341         struct sadb_msg *hdr;
3342         struct sadb_sa *sa;
3343         struct sadb_address *addr;
3344         struct sadb_x_nat_t_port *n_port;
3345         int sockaddr_size;
3346         int size;
3347         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3348         struct xfrm_encap_tmpl *natt = NULL;
3349
3350         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3351         if (!sockaddr_size)
3352                 return -EINVAL;
3353
3354         if (!satype)
3355                 return -EINVAL;
3356
3357         if (!x->encap)
3358                 return -EINVAL;
3359
3360         natt = x->encap;
3361
3362         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3363          *
3364          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3365          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3366          */
3367
3368         size = sizeof(struct sadb_msg) +
3369                 sizeof(struct sadb_sa) +
3370                 (sizeof(struct sadb_address) * 2) +
3371                 (sockaddr_size * 2) +
3372                 (sizeof(struct sadb_x_nat_t_port) * 2);
3373
3374         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3375         if (skb == NULL)
3376                 return -ENOMEM;
3377
3378         hdr = skb_put(skb, sizeof(struct sadb_msg));
3379         hdr->sadb_msg_version = PF_KEY_V2;
3380         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3381         hdr->sadb_msg_satype = satype;
3382         hdr->sadb_msg_len = size / sizeof(uint64_t);
3383         hdr->sadb_msg_errno = 0;
3384         hdr->sadb_msg_reserved = 0;
3385         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3386         hdr->sadb_msg_pid = 0;
3387
3388         /* SA */
3389         sa = skb_put(skb, sizeof(struct sadb_sa));
3390         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3391         sa->sadb_sa_exttype = SADB_EXT_SA;
3392         sa->sadb_sa_spi = x->id.spi;
3393         sa->sadb_sa_replay = 0;
3394         sa->sadb_sa_state = 0;
3395         sa->sadb_sa_auth = 0;
3396         sa->sadb_sa_encrypt = 0;
3397         sa->sadb_sa_flags = 0;
3398
3399         /* ADDRESS_SRC (old addr) */
3400         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3401         addr->sadb_address_len =
3402                 (sizeof(struct sadb_address)+sockaddr_size)/
3403                         sizeof(uint64_t);
3404         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3405         addr->sadb_address_proto = 0;
3406         addr->sadb_address_reserved = 0;
3407         addr->sadb_address_prefixlen =
3408                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3409                                     (struct sockaddr *) (addr + 1),
3410                                     x->props.family);
3411         if (!addr->sadb_address_prefixlen)
3412                 BUG();
3413
3414         /* NAT_T_SPORT (old port) */
3415         n_port = skb_put(skb, sizeof(*n_port));
3416         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3417         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3418         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3419         n_port->sadb_x_nat_t_port_reserved = 0;
3420
3421         /* ADDRESS_DST (new addr) */
3422         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3423         addr->sadb_address_len =
3424                 (sizeof(struct sadb_address)+sockaddr_size)/
3425                         sizeof(uint64_t);
3426         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3427         addr->sadb_address_proto = 0;
3428         addr->sadb_address_reserved = 0;
3429         addr->sadb_address_prefixlen =
3430                 pfkey_sockaddr_fill(ipaddr, 0,
3431                                     (struct sockaddr *) (addr + 1),
3432                                     x->props.family);
3433         if (!addr->sadb_address_prefixlen)
3434                 BUG();
3435
3436         /* NAT_T_DPORT (new port) */
3437         n_port = skb_put(skb, sizeof(*n_port));
3438         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3439         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3440         n_port->sadb_x_nat_t_port_port = sport;
3441         n_port->sadb_x_nat_t_port_reserved = 0;
3442
3443         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3444                                xs_net(x));
3445 }
3446
3447 #ifdef CONFIG_NET_KEY_MIGRATE
3448 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3449                             const struct xfrm_selector *sel)
3450 {
3451         struct sadb_address *addr;
3452         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3453         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3454         addr->sadb_address_exttype = type;
3455         addr->sadb_address_proto = sel->proto;
3456         addr->sadb_address_reserved = 0;
3457
3458         switch (type) {
3459         case SADB_EXT_ADDRESS_SRC:
3460                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3461                 pfkey_sockaddr_fill(&sel->saddr, 0,
3462                                     (struct sockaddr *)(addr + 1),
3463                                     sel->family);
3464                 break;
3465         case SADB_EXT_ADDRESS_DST:
3466                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3467                 pfkey_sockaddr_fill(&sel->daddr, 0,
3468                                     (struct sockaddr *)(addr + 1),
3469                                     sel->family);
3470                 break;
3471         default:
3472                 return -EINVAL;
3473         }
3474
3475         return 0;
3476 }
3477
3478
3479 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3480 {
3481         struct sadb_x_kmaddress *kma;
3482         u8 *sa;
3483         int family = k->family;
3484         int socklen = pfkey_sockaddr_len(family);
3485         int size_req;
3486
3487         size_req = (sizeof(struct sadb_x_kmaddress) +
3488                     pfkey_sockaddr_pair_size(family));
3489
3490         kma = skb_put_zero(skb, size_req);
3491         kma->sadb_x_kmaddress_len = size_req / 8;
3492         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3493         kma->sadb_x_kmaddress_reserved = k->reserved;
3494
3495         sa = (u8 *)(kma + 1);
3496         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3497             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3498                 return -EINVAL;
3499
3500         return 0;
3501 }
3502
3503 static int set_ipsecrequest(struct sk_buff *skb,
3504                             uint8_t proto, uint8_t mode, int level,
3505                             uint32_t reqid, uint8_t family,
3506                             const xfrm_address_t *src, const xfrm_address_t *dst)
3507 {
3508         struct sadb_x_ipsecrequest *rq;
3509         u8 *sa;
3510         int socklen = pfkey_sockaddr_len(family);
3511         int size_req;
3512
3513         size_req = sizeof(struct sadb_x_ipsecrequest) +
3514                    pfkey_sockaddr_pair_size(family);
3515
3516         rq = skb_put_zero(skb, size_req);
3517         rq->sadb_x_ipsecrequest_len = size_req;
3518         rq->sadb_x_ipsecrequest_proto = proto;
3519         rq->sadb_x_ipsecrequest_mode = mode;
3520         rq->sadb_x_ipsecrequest_level = level;
3521         rq->sadb_x_ipsecrequest_reqid = reqid;
3522
3523         sa = (u8 *) (rq + 1);
3524         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3525             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3526                 return -EINVAL;
3527
3528         return 0;
3529 }
3530 #endif
3531
3532 #ifdef CONFIG_NET_KEY_MIGRATE
3533 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3534                               const struct xfrm_migrate *m, int num_bundles,
3535                               const struct xfrm_kmaddress *k,
3536                               const struct xfrm_encap_tmpl *encap)
3537 {
3538         int i;
3539         int sasize_sel;
3540         int size = 0;
3541         int size_pol = 0;
3542         struct sk_buff *skb;
3543         struct sadb_msg *hdr;
3544         struct sadb_x_policy *pol;
3545         const struct xfrm_migrate *mp;
3546
3547         if (type != XFRM_POLICY_TYPE_MAIN)
3548                 return 0;
3549
3550         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3551                 return -EINVAL;
3552
3553         if (k != NULL) {
3554                 /* addresses for KM */
3555                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3556                                      pfkey_sockaddr_pair_size(k->family));
3557         }
3558
3559         /* selector */
3560         sasize_sel = pfkey_sockaddr_size(sel->family);
3561         if (!sasize_sel)
3562                 return -EINVAL;
3563         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3564
3565         /* policy info */
3566         size_pol += sizeof(struct sadb_x_policy);
3567
3568         /* ipsecrequests */
3569         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3570                 /* old locator pair */
3571                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3572                             pfkey_sockaddr_pair_size(mp->old_family);
3573                 /* new locator pair */
3574                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3575                             pfkey_sockaddr_pair_size(mp->new_family);
3576         }
3577
3578         size += sizeof(struct sadb_msg) + size_pol;
3579
3580         /* alloc buffer */
3581         skb = alloc_skb(size, GFP_ATOMIC);
3582         if (skb == NULL)
3583                 return -ENOMEM;
3584
3585         hdr = skb_put(skb, sizeof(struct sadb_msg));
3586         hdr->sadb_msg_version = PF_KEY_V2;
3587         hdr->sadb_msg_type = SADB_X_MIGRATE;
3588         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3589         hdr->sadb_msg_len = size / 8;
3590         hdr->sadb_msg_errno = 0;
3591         hdr->sadb_msg_reserved = 0;
3592         hdr->sadb_msg_seq = 0;
3593         hdr->sadb_msg_pid = 0;
3594
3595         /* Addresses to be used by KM for negotiation, if ext is available */
3596         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3597                 goto err;
3598
3599         /* selector src */
3600         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3601
3602         /* selector dst */
3603         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3604
3605         /* policy information */
3606         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3607         pol->sadb_x_policy_len = size_pol / 8;
3608         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3609         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3610         pol->sadb_x_policy_dir = dir + 1;
3611         pol->sadb_x_policy_reserved = 0;
3612         pol->sadb_x_policy_id = 0;
3613         pol->sadb_x_policy_priority = 0;
3614
3615         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3616                 /* old ipsecrequest */
3617                 int mode = pfkey_mode_from_xfrm(mp->mode);
3618                 if (mode < 0)
3619                         goto err;
3620                 if (set_ipsecrequest(skb, mp->proto, mode,
3621                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3622                                      mp->reqid, mp->old_family,
3623                                      &mp->old_saddr, &mp->old_daddr) < 0)
3624                         goto err;
3625
3626                 /* new ipsecrequest */
3627                 if (set_ipsecrequest(skb, mp->proto, mode,
3628                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3629                                      mp->reqid, mp->new_family,
3630                                      &mp->new_saddr, &mp->new_daddr) < 0)
3631                         goto err;
3632         }
3633
3634         /* broadcast migrate message to sockets */
3635         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3636
3637         return 0;
3638
3639 err:
3640         kfree_skb(skb);
3641         return -EINVAL;
3642 }
3643 #else
3644 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3645                               const struct xfrm_migrate *m, int num_bundles,
3646                               const struct xfrm_kmaddress *k,
3647                               const struct xfrm_encap_tmpl *encap)
3648 {
3649         return -ENOPROTOOPT;
3650 }
3651 #endif
3652
3653 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3654 {
3655         struct sock *sk = sock->sk;
3656         struct sk_buff *skb = NULL;
3657         struct sadb_msg *hdr = NULL;
3658         int err;
3659         struct net *net = sock_net(sk);
3660
3661         err = -EOPNOTSUPP;
3662         if (msg->msg_flags & MSG_OOB)
3663                 goto out;
3664
3665         err = -EMSGSIZE;
3666         if ((unsigned int)len > sk->sk_sndbuf - 32)
3667                 goto out;
3668
3669         err = -ENOBUFS;
3670         skb = alloc_skb(len, GFP_KERNEL);
3671         if (skb == NULL)
3672                 goto out;
3673
3674         err = -EFAULT;
3675         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3676                 goto out;
3677
3678         hdr = pfkey_get_base_msg(skb, &err);
3679         if (!hdr)
3680                 goto out;
3681
3682         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3683         err = pfkey_process(sk, skb, hdr);
3684         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3685
3686 out:
3687         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3688                 err = 0;
3689         kfree_skb(skb);
3690
3691         return err ? : len;
3692 }
3693
3694 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3695                          int flags)
3696 {
3697         struct sock *sk = sock->sk;
3698         struct pfkey_sock *pfk = pfkey_sk(sk);
3699         struct sk_buff *skb;
3700         int copied, err;
3701
3702         err = -EINVAL;
3703         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3704                 goto out;
3705
3706         skb = skb_recv_datagram(sk, flags, &err);
3707         if (skb == NULL)
3708                 goto out;
3709
3710         copied = skb->len;
3711         if (copied > len) {
3712                 msg->msg_flags |= MSG_TRUNC;
3713                 copied = len;
3714         }
3715
3716         skb_reset_transport_header(skb);
3717         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3718         if (err)
3719                 goto out_free;
3720
3721         sock_recv_cmsgs(msg, sk, skb);
3722
3723         err = (flags & MSG_TRUNC) ? skb->len : copied;
3724
3725         if (pfk->dump.dump != NULL &&
3726             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3727                 pfkey_do_dump(pfk);
3728
3729 out_free:
3730         skb_free_datagram(sk, skb);
3731 out:
3732         return err;
3733 }
3734
3735 static const struct proto_ops pfkey_ops = {
3736         .family         =       PF_KEY,
3737         .owner          =       THIS_MODULE,
3738         /* Operations that make no sense on pfkey sockets. */
3739         .bind           =       sock_no_bind,
3740         .connect        =       sock_no_connect,
3741         .socketpair     =       sock_no_socketpair,
3742         .accept         =       sock_no_accept,
3743         .getname        =       sock_no_getname,
3744         .ioctl          =       sock_no_ioctl,
3745         .listen         =       sock_no_listen,
3746         .shutdown       =       sock_no_shutdown,
3747         .mmap           =       sock_no_mmap,
3748         .sendpage       =       sock_no_sendpage,
3749
3750         /* Now the operations that really occur. */
3751         .release        =       pfkey_release,
3752         .poll           =       datagram_poll,
3753         .sendmsg        =       pfkey_sendmsg,
3754         .recvmsg        =       pfkey_recvmsg,
3755 };
3756
3757 static const struct net_proto_family pfkey_family_ops = {
3758         .family =       PF_KEY,
3759         .create =       pfkey_create,
3760         .owner  =       THIS_MODULE,
3761 };
3762
3763 #ifdef CONFIG_PROC_FS
3764 static int pfkey_seq_show(struct seq_file *f, void *v)
3765 {
3766         struct sock *s = sk_entry(v);
3767
3768         if (v == SEQ_START_TOKEN)
3769                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3770         else
3771                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3772                                s,
3773                                refcount_read(&s->sk_refcnt),
3774                                sk_rmem_alloc_get(s),
3775                                sk_wmem_alloc_get(s),
3776                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3777                                sock_i_ino(s)
3778                                );
3779         return 0;
3780 }
3781
3782 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3783         __acquires(rcu)
3784 {
3785         struct net *net = seq_file_net(f);
3786         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3787
3788         rcu_read_lock();
3789         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3790 }
3791
3792 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3793 {
3794         struct net *net = seq_file_net(f);
3795         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3796
3797         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3798 }
3799
3800 static void pfkey_seq_stop(struct seq_file *f, void *v)
3801         __releases(rcu)
3802 {
3803         rcu_read_unlock();
3804 }
3805
3806 static const struct seq_operations pfkey_seq_ops = {
3807         .start  = pfkey_seq_start,
3808         .next   = pfkey_seq_next,
3809         .stop   = pfkey_seq_stop,
3810         .show   = pfkey_seq_show,
3811 };
3812
3813 static int __net_init pfkey_init_proc(struct net *net)
3814 {
3815         struct proc_dir_entry *e;
3816
3817         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3818                         sizeof(struct seq_net_private));
3819         if (e == NULL)
3820                 return -ENOMEM;
3821
3822         return 0;
3823 }
3824
3825 static void __net_exit pfkey_exit_proc(struct net *net)
3826 {
3827         remove_proc_entry("pfkey", net->proc_net);
3828 }
3829 #else
3830 static inline int pfkey_init_proc(struct net *net)
3831 {
3832         return 0;
3833 }
3834
3835 static inline void pfkey_exit_proc(struct net *net)
3836 {
3837 }
3838 #endif
3839
3840 static struct xfrm_mgr pfkeyv2_mgr =
3841 {
3842         .notify         = pfkey_send_notify,
3843         .acquire        = pfkey_send_acquire,
3844         .compile_policy = pfkey_compile_policy,
3845         .new_mapping    = pfkey_send_new_mapping,
3846         .notify_policy  = pfkey_send_policy_notify,
3847         .migrate        = pfkey_send_migrate,
3848         .is_alive       = pfkey_is_alive,
3849 };
3850
3851 static int __net_init pfkey_net_init(struct net *net)
3852 {
3853         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3854         int rv;
3855
3856         INIT_HLIST_HEAD(&net_pfkey->table);
3857         atomic_set(&net_pfkey->socks_nr, 0);
3858
3859         rv = pfkey_init_proc(net);
3860
3861         return rv;
3862 }
3863
3864 static void __net_exit pfkey_net_exit(struct net *net)
3865 {
3866         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3867
3868         pfkey_exit_proc(net);
3869         WARN_ON(!hlist_empty(&net_pfkey->table));
3870 }
3871
3872 static struct pernet_operations pfkey_net_ops = {
3873         .init = pfkey_net_init,
3874         .exit = pfkey_net_exit,
3875         .id   = &pfkey_net_id,
3876         .size = sizeof(struct netns_pfkey),
3877 };
3878
3879 static void __exit ipsec_pfkey_exit(void)
3880 {
3881         xfrm_unregister_km(&pfkeyv2_mgr);
3882         sock_unregister(PF_KEY);
3883         unregister_pernet_subsys(&pfkey_net_ops);
3884         proto_unregister(&key_proto);
3885 }
3886
3887 static int __init ipsec_pfkey_init(void)
3888 {
3889         int err = proto_register(&key_proto, 0);
3890
3891         if (err != 0)
3892                 goto out;
3893
3894         err = register_pernet_subsys(&pfkey_net_ops);
3895         if (err != 0)
3896                 goto out_unregister_key_proto;
3897         err = sock_register(&pfkey_family_ops);
3898         if (err != 0)
3899                 goto out_unregister_pernet;
3900         xfrm_register_km(&pfkeyv2_mgr);
3901 out:
3902         return err;
3903
3904 out_unregister_pernet:
3905         unregister_pernet_subsys(&pfkey_net_ops);
3906 out_unregister_key_proto:
3907         proto_unregister(&key_proto);
3908         goto out;
3909 }
3910
3911 module_init(ipsec_pfkey_init);
3912 module_exit(ipsec_pfkey_exit);
3913 MODULE_LICENSE("GPL");
3914 MODULE_ALIAS_NETPROTO(PF_KEY);