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         int err;
 145
 146         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 147                 return -EPERM;
 148         if (sock->type != SOCK_RAW)
 149                 return -ESOCKTNOSUPPORT;
 150         if (protocol != PF_KEY_V2)
 151                 return -EPROTONOSUPPORT;
 152
 153         err = -ENOMEM;
 154         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 155         if (sk == NULL)
 156                 goto out;
 157
 158         pfk = pfkey_sk(sk);
 159         mutex_init(&pfk->dump_lock);
 160
 161         sock->ops = &pfkey_ops;
 162         sock_init_data(sock, sk);
 163
 164         sk->sk_family = PF_KEY;
 165         sk->sk_destruct = pfkey_sock_destruct;
 166
 167         atomic_inc(&net_pfkey->socks_nr);
 168
 169         pfkey_insert(sk);
 170
 171         return 0;
 172 out:
 173         return err;
 174 }
 175
 176 static int pfkey_release(struct socket *sock)
 177 {
 178         struct sock *sk = sock->sk;
 179
 180         if (!sk)
 181                 return 0;
 182
 183         pfkey_remove(sk);
 184
 185         sock_orphan(sk);
 186         sock->sk = NULL;
 187         skb_queue_purge(&sk->sk_write_queue);
 188
 189         synchronize_rcu();
 190         sock_put(sk);
 191
 192         return 0;
 193 }
 194
 195 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
 196                                struct sock *sk)
 197 {
 198         int err = -ENOBUFS;
 199
 200         if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 201                 return err;
 202
 203         skb = skb_clone(skb, allocation);
 204
 205         if (skb) {
 206                 skb_set_owner_r(skb, sk);
 207                 skb_queue_tail(&sk->sk_receive_queue, skb);
 208                 sk->sk_data_ready(sk);
 209                 err = 0;
 210         }
 211         return err;
 212 }
 213
 214 /* Send SKB to all pfkey sockets matching selected criteria.  */
 215 #define BROADCAST_ALL           0
 216 #define BROADCAST_ONE           1
 217 #define BROADCAST_REGISTERED    2
 218 #define BROADCAST_PROMISC_ONLY  4
 219 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 220                            int broadcast_flags, struct sock *one_sk,
 221                            struct net *net)
 222 {
 223         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 224         struct sock *sk;
 225         int err = -ESRCH;
 226
 227         /* XXX Do we need something like netlink_overrun?  I think
 228          * XXX PF_KEY socket apps will not mind current behavior.
 229          */
 230         if (!skb)
 231                 return -ENOMEM;
 232
 233         rcu_read_lock();
 234         sk_for_each_rcu(sk, &net_pfkey->table) {
 235                 struct pfkey_sock *pfk = pfkey_sk(sk);
 236                 int err2;
 237
 238                 /* Yes, it means that if you are meant to receive this
 239                  * pfkey message you receive it twice as promiscuous
 240                  * socket.
 241                  */
 242                 if (pfk->promisc)
 243                         pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 244
 245                 /* the exact target will be processed later */
 246                 if (sk == one_sk)
 247                         continue;
 248                 if (broadcast_flags != BROADCAST_ALL) {
 249                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 250                                 continue;
 251                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 252                             !pfk->registered)
 253                                 continue;
 254                         if (broadcast_flags & BROADCAST_ONE)
 255                                 continue;
 256                 }
 257
 258                 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 259
 260                 /* Error is cleared after successful sending to at least one
 261                  * registered KM */
 262                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 263                         err = err2;
 264         }
 265         rcu_read_unlock();
 266
 267         if (one_sk != NULL)
 268                 err = pfkey_broadcast_one(skb, allocation, one_sk);
 269
 270         kfree_skb(skb);
 271         return err;
 272 }
 273
 274 static int pfkey_do_dump(struct pfkey_sock *pfk)
 275 {
 276         struct sadb_msg *hdr;
 277         int rc;
 278
 279         mutex_lock(&pfk->dump_lock);
 280         if (!pfk->dump.dump) {
 281                 rc = 0;
 282                 goto out;
 283         }
 284
 285         rc = pfk->dump.dump(pfk);
 286         if (rc == -ENOBUFS) {
 287                 rc = 0;
 288                 goto out;
 289         }
 290
 291         if (pfk->dump.skb) {
 292                 if (!pfkey_can_dump(&pfk->sk)) {
 293                         rc = 0;
 294                         goto out;
 295                 }
 296
 297                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 298                 hdr->sadb_msg_seq = 0;
 299                 hdr->sadb_msg_errno = rc;
 300                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 301                                 &pfk->sk, sock_net(&pfk->sk));
 302                 pfk->dump.skb = NULL;
 303         }
 304
 305         pfkey_terminate_dump(pfk);
 306
 307 out:
 308         mutex_unlock(&pfk->dump_lock);
 309         return rc;
 310 }
 311
 312 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 313                                  const struct sadb_msg *orig)
 314 {
 315         *new = *orig;
 316 }
 317
 318 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 319 {
 320         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 321         struct sadb_msg *hdr;
 322
 323         if (!skb)
 324                 return -ENOBUFS;
 325
 326         /* Woe be to the platform trying to support PFKEY yet
 327          * having normal errnos outside the 1-255 range, inclusive.
 328          */
 329         err = -err;
 330         if (err == ERESTARTSYS ||
 331             err == ERESTARTNOHAND ||
 332             err == ERESTARTNOINTR)
 333                 err = EINTR;
 334         if (err >= 512)
 335                 err = EINVAL;
 336         BUG_ON(err <= 0 || err >= 256);
 337
 338         hdr = skb_put(skb, sizeof(struct sadb_msg));
 339         pfkey_hdr_dup(hdr, orig);
 340         hdr->sadb_msg_errno = (uint8_t) err;
 341         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 342                              sizeof(uint64_t));
 343
 344         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 345
 346         return 0;
 347 }
 348
 349 static const u8 sadb_ext_min_len[] = {
 350         [SADB_EXT_RESERVED]             = (u8) 0,
 351         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 352         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 353         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 354         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 355         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 356         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 357         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 358         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 359         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 360         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 361         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 362         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 363         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 364         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 365         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 366         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 367         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 368         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 369         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 370         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 371         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 372         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 373         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 374         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 375         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 376         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 377 };
 378
 379 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 380 static int verify_address_len(const void *p)
 381 {
 382         const struct sadb_address *sp = p;
 383         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 384         const struct sockaddr_in *sin;
 385 #if IS_ENABLED(CONFIG_IPV6)
 386         const struct sockaddr_in6 *sin6;
 387 #endif
 388         int len;
 389
 390         if (sp->sadb_address_len <
 391             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 392                          sizeof(uint64_t)))
 393                 return -EINVAL;
 394
 395         switch (addr->sa_family) {
 396         case AF_INET:
 397                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 398                 if (sp->sadb_address_len != len ||
 399                     sp->sadb_address_prefixlen > 32)
 400                         return -EINVAL;
 401                 break;
 402 #if IS_ENABLED(CONFIG_IPV6)
 403         case AF_INET6:
 404                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 405                 if (sp->sadb_address_len != len ||
 406                     sp->sadb_address_prefixlen > 128)
 407                         return -EINVAL;
 408                 break;
 409 #endif
 410         default:
 411                 /* It is user using kernel to keep track of security
 412                  * associations for another protocol, such as
 413                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 414                  * lengths.
 415                  *
 416                  * XXX Actually, association/policy database is not yet
 417                  * XXX able to cope with arbitrary sockaddr families.
 418                  * XXX When it can, remove this -EINVAL.  -DaveM
 419                  */
 420                 return -EINVAL;
 421         }
 422
 423         return 0;
 424 }
 425
 426 static inline int sadb_key_len(const struct sadb_key *key)
 427 {
 428         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 429
 430         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 431                             sizeof(uint64_t));
 432 }
 433
 434 static int verify_key_len(const void *p)
 435 {
 436         const struct sadb_key *key = p;
 437
 438         if (sadb_key_len(key) > key->sadb_key_len)
 439                 return -EINVAL;
 440
 441         return 0;
 442 }
 443
 444 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 445 {
 446         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 447                             sec_ctx->sadb_x_ctx_len,
 448                             sizeof(uint64_t));
 449 }
 450
 451 static inline int verify_sec_ctx_len(const void *p)
 452 {
 453         const struct sadb_x_sec_ctx *sec_ctx = p;
 454         int len = sec_ctx->sadb_x_ctx_len;
 455
 456         if (len > PAGE_SIZE)
 457                 return -EINVAL;
 458
 459         len = pfkey_sec_ctx_len(sec_ctx);
 460
 461         if (sec_ctx->sadb_x_sec_len != len)
 462                 return -EINVAL;
 463
 464         return 0;
 465 }
 466
 467 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 468                                                                      gfp_t gfp)
 469 {
 470         struct xfrm_user_sec_ctx *uctx = NULL;
 471         int ctx_size = sec_ctx->sadb_x_ctx_len;
 472
 473         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 474
 475         if (!uctx)
 476                 return NULL;
 477
 478         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 479         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 480         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 481         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 482         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 483         memcpy(uctx + 1, sec_ctx + 1,
 484                uctx->ctx_len);
 485
 486         return uctx;
 487 }
 488
 489 static int present_and_same_family(const struct sadb_address *src,
 490                                    const struct sadb_address *dst)
 491 {
 492         const struct sockaddr *s_addr, *d_addr;
 493
 494         if (!src || !dst)
 495                 return 0;
 496
 497         s_addr = (const struct sockaddr *)(src + 1);
 498         d_addr = (const struct sockaddr *)(dst + 1);
 499         if (s_addr->sa_family != d_addr->sa_family)
 500                 return 0;
 501         if (s_addr->sa_family != AF_INET
 502 #if IS_ENABLED(CONFIG_IPV6)
 503             && s_addr->sa_family != AF_INET6
 504 #endif
 505                 )
 506                 return 0;
 507
 508         return 1;
 509 }
 510
 511 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 512 {
 513         const char *p = (char *) hdr;
 514         int len = skb->len;
 515
 516         len -= sizeof(*hdr);
 517         p += sizeof(*hdr);
 518         while (len > 0) {
 519                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 520                 uint16_t ext_type;
 521                 int ext_len;
 522
 523                 if (len < sizeof(*ehdr))
 524                         return -EINVAL;
 525
 526                 ext_len  = ehdr->sadb_ext_len;
 527                 ext_len *= sizeof(uint64_t);
 528                 ext_type = ehdr->sadb_ext_type;
 529                 if (ext_len < sizeof(uint64_t) ||
 530                     ext_len > len ||
 531                     ext_type == SADB_EXT_RESERVED)
 532                         return -EINVAL;
 533
 534                 if (ext_type <= SADB_EXT_MAX) {
 535                         int min = (int) sadb_ext_min_len[ext_type];
 536                         if (ext_len < min)
 537                                 return -EINVAL;
 538                         if (ext_hdrs[ext_type-1] != NULL)
 539                                 return -EINVAL;
 540                         switch (ext_type) {
 541                         case SADB_EXT_ADDRESS_SRC:
 542                         case SADB_EXT_ADDRESS_DST:
 543                         case SADB_EXT_ADDRESS_PROXY:
 544                         case SADB_X_EXT_NAT_T_OA:
 545                                 if (verify_address_len(p))
 546                                         return -EINVAL;
 547                                 break;
 548                         case SADB_X_EXT_SEC_CTX:
 549                                 if (verify_sec_ctx_len(p))
 550                                         return -EINVAL;
 551                                 break;
 552                         case SADB_EXT_KEY_AUTH:
 553                         case SADB_EXT_KEY_ENCRYPT:
 554                                 if (verify_key_len(p))
 555                                         return -EINVAL;
 556                                 break;
 557                         default:
 558                                 break;
 559                         }
 560                         ext_hdrs[ext_type-1] = (void *) p;
 561                 }
 562                 p   += ext_len;
 563                 len -= ext_len;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static uint16_t
 570 pfkey_satype2proto(uint8_t satype)
 571 {
 572         switch (satype) {
 573         case SADB_SATYPE_UNSPEC:
 574                 return IPSEC_PROTO_ANY;
 575         case SADB_SATYPE_AH:
 576                 return IPPROTO_AH;
 577         case SADB_SATYPE_ESP:
 578                 return IPPROTO_ESP;
 579         case SADB_X_SATYPE_IPCOMP:
 580                 return IPPROTO_COMP;
 581         default:
 582                 return 0;
 583         }
 584         /* NOTREACHED */
 585 }
 586
 587 static uint8_t
 588 pfkey_proto2satype(uint16_t proto)
 589 {
 590         switch (proto) {
 591         case IPPROTO_AH:
 592                 return SADB_SATYPE_AH;
 593         case IPPROTO_ESP:
 594                 return SADB_SATYPE_ESP;
 595         case IPPROTO_COMP:
 596                 return SADB_X_SATYPE_IPCOMP;
 597         default:
 598                 return 0;
 599         }
 600         /* NOTREACHED */
 601 }
 602
 603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 604  * say specifically 'just raw sockets' as we encode them as 255.
 605  */
 606
 607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 608 {
 609         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 610 }
 611
 612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 613 {
 614         return proto ? proto : IPSEC_PROTO_ANY;
 615 }
 616
 617 static inline int pfkey_sockaddr_len(sa_family_t family)
 618 {
 619         switch (family) {
 620         case AF_INET:
 621                 return sizeof(struct sockaddr_in);
 622 #if IS_ENABLED(CONFIG_IPV6)
 623         case AF_INET6:
 624                 return sizeof(struct sockaddr_in6);
 625 #endif
 626         }
 627         return 0;
 628 }
 629
 630 static
 631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 632 {
 633         switch (sa->sa_family) {
 634         case AF_INET:
 635                 xaddr->a4 =
 636                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 637                 return AF_INET;
 638 #if IS_ENABLED(CONFIG_IPV6)
 639         case AF_INET6:
 640                 memcpy(xaddr->a6,
 641                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 642                        sizeof(struct in6_addr));
 643                 return AF_INET6;
 644 #endif
 645         }
 646         return 0;
 647 }
 648
 649 static
 650 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 651 {
 652         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 653                                       xaddr);
 654 }
 655
 656 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 657 {
 658         const struct sadb_sa *sa;
 659         const struct sadb_address *addr;
 660         uint16_t proto;
 661         unsigned short family;
 662         xfrm_address_t *xaddr;
 663
 664         sa = ext_hdrs[SADB_EXT_SA - 1];
 665         if (sa == NULL)
 666                 return NULL;
 667
 668         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 669         if (proto == 0)
 670                 return NULL;
 671
 672         /* sadb_address_len should be checked by caller */
 673         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 674         if (addr == NULL)
 675                 return NULL;
 676
 677         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 678         switch (family) {
 679         case AF_INET:
 680                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 681                 break;
 682 #if IS_ENABLED(CONFIG_IPV6)
 683         case AF_INET6:
 684                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 685                 break;
 686 #endif
 687         default:
 688                 xaddr = NULL;
 689         }
 690
 691         if (!xaddr)
 692                 return NULL;
 693
 694         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 695 }
 696
 697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 698
 699 static int
 700 pfkey_sockaddr_size(sa_family_t family)
 701 {
 702         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 703 }
 704
 705 static inline int pfkey_mode_from_xfrm(int mode)
 706 {
 707         switch(mode) {
 708         case XFRM_MODE_TRANSPORT:
 709                 return IPSEC_MODE_TRANSPORT;
 710         case XFRM_MODE_TUNNEL:
 711                 return IPSEC_MODE_TUNNEL;
 712         case XFRM_MODE_BEET:
 713                 return IPSEC_MODE_BEET;
 714         default:
 715                 return -1;
 716         }
 717 }
 718
 719 static inline int pfkey_mode_to_xfrm(int mode)
 720 {
 721         switch(mode) {
 722         case IPSEC_MODE_ANY:    /*XXX*/
 723         case IPSEC_MODE_TRANSPORT:
 724                 return XFRM_MODE_TRANSPORT;
 725         case IPSEC_MODE_TUNNEL:
 726                 return XFRM_MODE_TUNNEL;
 727         case IPSEC_MODE_BEET:
 728                 return XFRM_MODE_BEET;
 729         default:
 730                 return -1;
 731         }
 732 }
 733
 734 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 735                                         struct sockaddr *sa,
 736                                         unsigned short family)
 737 {
 738         switch (family) {
 739         case AF_INET:
 740             {
 741                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 742                 sin->sin_family = AF_INET;
 743                 sin->sin_port = port;
 744                 sin->sin_addr.s_addr = xaddr->a4;
 745                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 746                 return 32;
 747             }
 748 #if IS_ENABLED(CONFIG_IPV6)
 749         case AF_INET6:
 750             {
 751                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 752                 sin6->sin6_family = AF_INET6;
 753                 sin6->sin6_port = port;
 754                 sin6->sin6_flowinfo = 0;
 755                 sin6->sin6_addr = xaddr->in6;
 756                 sin6->sin6_scope_id = 0;
 757                 return 128;
 758             }
 759 #endif
 760         }
 761         return 0;
 762 }
 763
 764 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 765                                               int add_keys, int hsc)
 766 {
 767         struct sk_buff *skb;
 768         struct sadb_msg *hdr;
 769         struct sadb_sa *sa;
 770         struct sadb_lifetime *lifetime;
 771         struct sadb_address *addr;
 772         struct sadb_key *key;
 773         struct sadb_x_sa2 *sa2;
 774         struct sadb_x_sec_ctx *sec_ctx;
 775         struct xfrm_sec_ctx *xfrm_ctx;
 776         int ctx_size = 0;
 777         int size;
 778         int auth_key_size = 0;
 779         int encrypt_key_size = 0;
 780         int sockaddr_size;
 781         struct xfrm_encap_tmpl *natt = NULL;
 782         int mode;
 783
 784         /* address family check */
 785         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 786         if (!sockaddr_size)
 787                 return ERR_PTR(-EINVAL);
 788
 789         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 790            key(AE), (identity(SD),) (sensitivity)> */
 791         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 792                 sizeof(struct sadb_lifetime) +
 793                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 794                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 795                         sizeof(struct sadb_address)*2 +
 796                                 sockaddr_size*2 +
 797                                         sizeof(struct sadb_x_sa2);
 798
 799         if ((xfrm_ctx = x->security)) {
 800                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 801                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 802         }
 803
 804         /* identity & sensitivity */
 805         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 806                 size += sizeof(struct sadb_address) + sockaddr_size;
 807
 808         if (add_keys) {
 809                 if (x->aalg && x->aalg->alg_key_len) {
 810                         auth_key_size =
 811                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 812                         size += sizeof(struct sadb_key) + auth_key_size;
 813                 }
 814                 if (x->ealg && x->ealg->alg_key_len) {
 815                         encrypt_key_size =
 816                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 817                         size += sizeof(struct sadb_key) + encrypt_key_size;
 818                 }
 819         }
 820         if (x->encap)
 821                 natt = x->encap;
 822
 823         if (natt && natt->encap_type) {
 824                 size += sizeof(struct sadb_x_nat_t_type);
 825                 size += sizeof(struct sadb_x_nat_t_port);
 826                 size += sizeof(struct sadb_x_nat_t_port);
 827         }
 828
 829         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 830         if (skb == NULL)
 831                 return ERR_PTR(-ENOBUFS);
 832
 833         /* call should fill header later */
 834         hdr = skb_put(skb, sizeof(struct sadb_msg));
 835         memset(hdr, 0, size);   /* XXX do we need this ? */
 836         hdr->sadb_msg_len = size / sizeof(uint64_t);
 837
 838         /* sa */
 839         sa = skb_put(skb, sizeof(struct sadb_sa));
 840         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 841         sa->sadb_sa_exttype = SADB_EXT_SA;
 842         sa->sadb_sa_spi = x->id.spi;
 843         sa->sadb_sa_replay = x->props.replay_window;
 844         switch (x->km.state) {
 845         case XFRM_STATE_VALID:
 846                 sa->sadb_sa_state = x->km.dying ?
 847                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 848                 break;
 849         case XFRM_STATE_ACQ:
 850                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 851                 break;
 852         default:
 853                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 854                 break;
 855         }
 856         sa->sadb_sa_auth = 0;
 857         if (x->aalg) {
 858                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 859                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 860                                         a->desc.sadb_alg_id : 0;
 861         }
 862         sa->sadb_sa_encrypt = 0;
 863         BUG_ON(x->ealg && x->calg);
 864         if (x->ealg) {
 865                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 866                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 867                                         a->desc.sadb_alg_id : 0;
 868         }
 869         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 870         if (x->calg) {
 871                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 872                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 873                                         a->desc.sadb_alg_id : 0;
 874         }
 875
 876         sa->sadb_sa_flags = 0;
 877         if (x->props.flags & XFRM_STATE_NOECN)
 878                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 879         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 880                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 881         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 882                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 883
 884         /* hard time */
 885         if (hsc & 2) {
 886                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 887                 lifetime->sadb_lifetime_len =
 888                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 889                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 890                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 891                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 892                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 893                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 894         }
 895         /* soft time */
 896         if (hsc & 1) {
 897                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 898                 lifetime->sadb_lifetime_len =
 899                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 900                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 901                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 902                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 903                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 904                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 905         }
 906         /* current time */
 907         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 908         lifetime->sadb_lifetime_len =
 909                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 910         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 911         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 912         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 913         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 914         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 915         /* src address */
 916         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 917         addr->sadb_address_len =
 918                 (sizeof(struct sadb_address)+sockaddr_size)/
 919                         sizeof(uint64_t);
 920         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 921         /* "if the ports are non-zero, then the sadb_address_proto field,
 922            normally zero, MUST be filled in with the transport
 923            protocol's number." - RFC2367 */
 924         addr->sadb_address_proto = 0;
 925         addr->sadb_address_reserved = 0;
 926
 927         addr->sadb_address_prefixlen =
 928                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 929                                     (struct sockaddr *) (addr + 1),
 930                                     x->props.family);
 931         BUG_ON(!addr->sadb_address_prefixlen);
 932
 933         /* dst address */
 934         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 935         addr->sadb_address_len =
 936                 (sizeof(struct sadb_address)+sockaddr_size)/
 937                         sizeof(uint64_t);
 938         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 939         addr->sadb_address_proto = 0;
 940         addr->sadb_address_reserved = 0;
 941
 942         addr->sadb_address_prefixlen =
 943                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 944                                     (struct sockaddr *) (addr + 1),
 945                                     x->props.family);
 946         BUG_ON(!addr->sadb_address_prefixlen);
 947
 948         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 949                              x->props.family)) {
 950                 addr = skb_put(skb,
 951                                sizeof(struct sadb_address) + sockaddr_size);
 952                 addr->sadb_address_len =
 953                         (sizeof(struct sadb_address)+sockaddr_size)/
 954                         sizeof(uint64_t);
 955                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 956                 addr->sadb_address_proto =
 957                         pfkey_proto_from_xfrm(x->sel.proto);
 958                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 959                 addr->sadb_address_reserved = 0;
 960
 961                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 962                                     (struct sockaddr *) (addr + 1),
 963                                     x->props.family);
 964         }
 965
 966         /* auth key */
 967         if (add_keys && auth_key_size) {
 968                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 969                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 970                         sizeof(uint64_t);
 971                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 972                 key->sadb_key_bits = x->aalg->alg_key_len;
 973                 key->sadb_key_reserved = 0;
 974                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 975         }
 976         /* encrypt key */
 977         if (add_keys && encrypt_key_size) {
 978                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 979                 key->sadb_key_len = (sizeof(struct sadb_key) +
 980                                      encrypt_key_size) / sizeof(uint64_t);
 981                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 982                 key->sadb_key_bits = x->ealg->alg_key_len;
 983                 key->sadb_key_reserved = 0;
 984                 memcpy(key + 1, x->ealg->alg_key,
 985                        (x->ealg->alg_key_len+7)/8);
 986         }
 987
 988         /* sa */
 989         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 990         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 991         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 992         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 993                 kfree_skb(skb);
 994                 return ERR_PTR(-EINVAL);
 995         }
 996         sa2->sadb_x_sa2_mode = mode;
 997         sa2->sadb_x_sa2_reserved1 = 0;
 998         sa2->sadb_x_sa2_reserved2 = 0;
 999         sa2->sadb_x_sa2_sequence = 0;
1000         sa2->sadb_x_sa2_reqid = x->props.reqid;
1001
1002         if (natt && natt->encap_type) {
1003                 struct sadb_x_nat_t_type *n_type;
1004                 struct sadb_x_nat_t_port *n_port;
1005
1006                 /* type */
1007                 n_type = skb_put(skb, sizeof(*n_type));
1008                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1009                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1010                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1011                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1012                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1013                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1014
1015                 /* source port */
1016                 n_port = skb_put(skb, sizeof(*n_port));
1017                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1018                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1019                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1020                 n_port->sadb_x_nat_t_port_reserved = 0;
1021
1022                 /* dest port */
1023                 n_port = skb_put(skb, sizeof(*n_port));
1024                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1025                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1026                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1027                 n_port->sadb_x_nat_t_port_reserved = 0;
1028         }
1029
1030         /* security context */
1031         if (xfrm_ctx) {
1032                 sec_ctx = skb_put(skb,
1033                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1034                 sec_ctx->sadb_x_sec_len =
1035                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1036                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1037                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1038                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1039                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1040                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1041                        xfrm_ctx->ctx_len);
1042         }
1043
1044         return skb;
1045 }
1046
1047
1048 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1049 {
1050         struct sk_buff *skb;
1051
1052         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1053
1054         return skb;
1055 }
1056
1057 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1058                                                           int hsc)
1059 {
1060         return __pfkey_xfrm_state2msg(x, 0, hsc);
1061 }
1062
1063 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1064                                                 const struct sadb_msg *hdr,
1065                                                 void * const *ext_hdrs)
1066 {
1067         struct xfrm_state *x;
1068         const struct sadb_lifetime *lifetime;
1069         const struct sadb_sa *sa;
1070         const struct sadb_key *key;
1071         const struct sadb_x_sec_ctx *sec_ctx;
1072         uint16_t proto;
1073         int err;
1074
1075
1076         sa = ext_hdrs[SADB_EXT_SA - 1];
1077         if (!sa ||
1078             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1079                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1080                 return ERR_PTR(-EINVAL);
1081         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1082             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1083                 return ERR_PTR(-EINVAL);
1084         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1085             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1086                 return ERR_PTR(-EINVAL);
1087         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1088             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1089                 return ERR_PTR(-EINVAL);
1090
1091         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1092         if (proto == 0)
1093                 return ERR_PTR(-EINVAL);
1094
1095         /* default error is no buffer space */
1096         err = -ENOBUFS;
1097
1098         /* RFC2367:
1099
1100    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1101    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1102    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1103    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1104    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1105    not true.
1106
1107            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1108            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1109          */
1110         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1111             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1112              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1113             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1114                 return ERR_PTR(-EINVAL);
1115         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1116         if (key != NULL &&
1117             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1118             key->sadb_key_bits == 0)
1119                 return ERR_PTR(-EINVAL);
1120         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1121         if (key != NULL &&
1122             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1123             key->sadb_key_bits == 0)
1124                 return ERR_PTR(-EINVAL);
1125
1126         x = xfrm_state_alloc(net);
1127         if (x == NULL)
1128                 return ERR_PTR(-ENOBUFS);
1129
1130         x->id.proto = proto;
1131         x->id.spi = sa->sadb_sa_spi;
1132         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1133                                         (sizeof(x->replay.bitmap) * 8));
1134         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1135                 x->props.flags |= XFRM_STATE_NOECN;
1136         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1137                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1138         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1139                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1140
1141         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1142         if (lifetime != NULL) {
1143                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1144                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1145                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1146                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1147         }
1148         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1149         if (lifetime != NULL) {
1150                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1151                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1152                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1153                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1154         }
1155
1156         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1157         if (sec_ctx != NULL) {
1158                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1159
1160                 if (!uctx)
1161                         goto out;
1162
1163                 err = security_xfrm_state_alloc(x, uctx);
1164                 kfree(uctx);
1165
1166                 if (err)
1167                         goto out;
1168         }
1169
1170         err = -ENOBUFS;
1171         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1172         if (sa->sadb_sa_auth) {
1173                 int keysize = 0;
1174                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1175                 if (!a || !a->pfkey_supported) {
1176                         err = -ENOSYS;
1177                         goto out;
1178                 }
1179                 if (key)
1180                         keysize = (key->sadb_key_bits + 7) / 8;
1181                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1182                 if (!x->aalg) {
1183                         err = -ENOMEM;
1184                         goto out;
1185                 }
1186                 strcpy(x->aalg->alg_name, a->name);
1187                 x->aalg->alg_key_len = 0;
1188                 if (key) {
1189                         x->aalg->alg_key_len = key->sadb_key_bits;
1190                         memcpy(x->aalg->alg_key, key+1, keysize);
1191                 }
1192                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1193                 x->props.aalgo = sa->sadb_sa_auth;
1194                 /* x->algo.flags = sa->sadb_sa_flags; */
1195         }
1196         if (sa->sadb_sa_encrypt) {
1197                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1198                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1199                         if (!a || !a->pfkey_supported) {
1200                                 err = -ENOSYS;
1201                                 goto out;
1202                         }
1203                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1204                         if (!x->calg) {
1205                                 err = -ENOMEM;
1206                                 goto out;
1207                         }
1208                         strcpy(x->calg->alg_name, a->name);
1209                         x->props.calgo = sa->sadb_sa_encrypt;
1210                 } else {
1211                         int keysize = 0;
1212                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1213                         if (!a || !a->pfkey_supported) {
1214                                 err = -ENOSYS;
1215                                 goto out;
1216                         }
1217                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1218                         if (key)
1219                                 keysize = (key->sadb_key_bits + 7) / 8;
1220                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1221                         if (!x->ealg) {
1222                                 err = -ENOMEM;
1223                                 goto out;
1224                         }
1225                         strcpy(x->ealg->alg_name, a->name);
1226                         x->ealg->alg_key_len = 0;
1227                         if (key) {
1228                                 x->ealg->alg_key_len = key->sadb_key_bits;
1229                                 memcpy(x->ealg->alg_key, key+1, keysize);
1230                         }
1231                         x->props.ealgo = sa->sadb_sa_encrypt;
1232                         x->geniv = a->uinfo.encr.geniv;
1233                 }
1234         }
1235         /* x->algo.flags = sa->sadb_sa_flags; */
1236
1237         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1238                                                     &x->props.saddr);
1239         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1240                                   &x->id.daddr);
1241
1242         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1243                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1244                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1245                 if (mode < 0) {
1246                         err = -EINVAL;
1247                         goto out;
1248                 }
1249                 x->props.mode = mode;
1250                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1251         }
1252
1253         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1254                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1255
1256                 /* Nobody uses this, but we try. */
1257                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1258                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1259         }
1260
1261         if (!x->sel.family)
1262                 x->sel.family = x->props.family;
1263
1264         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1265                 const struct sadb_x_nat_t_type* n_type;
1266                 struct xfrm_encap_tmpl *natt;
1267
1268                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1269                 if (!x->encap) {
1270                         err = -ENOMEM;
1271                         goto out;
1272                 }
1273
1274                 natt = x->encap;
1275                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1276                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1277
1278                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1279                         const struct sadb_x_nat_t_port *n_port =
1280                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1281                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1282                 }
1283                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1284                         const struct sadb_x_nat_t_port *n_port =
1285                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1286                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1287                 }
1288                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1289         }
1290
1291         err = xfrm_init_state(x);
1292         if (err)
1293                 goto out;
1294
1295         x->km.seq = hdr->sadb_msg_seq;
1296         return x;
1297
1298 out:
1299         x->km.state = XFRM_STATE_DEAD;
1300         xfrm_state_put(x);
1301         return ERR_PTR(err);
1302 }
1303
1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1305 {
1306         return -EOPNOTSUPP;
1307 }
1308
1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1310 {
1311         struct net *net = sock_net(sk);
1312         struct sk_buff *resp_skb;
1313         struct sadb_x_sa2 *sa2;
1314         struct sadb_address *saddr, *daddr;
1315         struct sadb_msg *out_hdr;
1316         struct sadb_spirange *range;
1317         struct xfrm_state *x = NULL;
1318         int mode;
1319         int err;
1320         u32 min_spi, max_spi;
1321         u32 reqid;
1322         u8 proto;
1323         unsigned short family;
1324         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1325
1326         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1327                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1328                 return -EINVAL;
1329
1330         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1331         if (proto == 0)
1332                 return -EINVAL;
1333
1334         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1335                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1336                 if (mode < 0)
1337                         return -EINVAL;
1338                 reqid = sa2->sadb_x_sa2_reqid;
1339         } else {
1340                 mode = 0;
1341                 reqid = 0;
1342         }
1343
1344         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1345         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1346
1347         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1348         switch (family) {
1349         case AF_INET:
1350                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1351                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1352                 break;
1353 #if IS_ENABLED(CONFIG_IPV6)
1354         case AF_INET6:
1355                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1356                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1357                 break;
1358 #endif
1359         }
1360
1361         if (hdr->sadb_msg_seq) {
1362                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1363                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1364                         xfrm_state_put(x);
1365                         x = NULL;
1366                 }
1367         }
1368
1369         if (!x)
1370                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1371
1372         if (x == NULL)
1373                 return -ENOENT;
1374
1375         min_spi = 0x100;
1376         max_spi = 0x0fffffff;
1377
1378         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1379         if (range) {
1380                 min_spi = range->sadb_spirange_min;
1381                 max_spi = range->sadb_spirange_max;
1382         }
1383
1384         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1385         if (err) {
1386                 xfrm_state_put(x);
1387                 return err;
1388         }
1389
1390         err = xfrm_alloc_spi(x, min_spi, max_spi);
1391         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1392
1393         if (IS_ERR(resp_skb)) {
1394                 xfrm_state_put(x);
1395                 return  PTR_ERR(resp_skb);
1396         }
1397
1398         out_hdr = (struct sadb_msg *) resp_skb->data;
1399         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1400         out_hdr->sadb_msg_type = SADB_GETSPI;
1401         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1402         out_hdr->sadb_msg_errno = 0;
1403         out_hdr->sadb_msg_reserved = 0;
1404         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1405         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1406
1407         xfrm_state_put(x);
1408
1409         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1410
1411         return 0;
1412 }
1413
1414 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1415 {
1416         struct net *net = sock_net(sk);
1417         struct xfrm_state *x;
1418
1419         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1420                 return -EOPNOTSUPP;
1421
1422         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1423                 return 0;
1424
1425         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1426         if (x == NULL)
1427                 return 0;
1428
1429         spin_lock_bh(&x->lock);
1430         if (x->km.state == XFRM_STATE_ACQ)
1431                 x->km.state = XFRM_STATE_ERROR;
1432
1433         spin_unlock_bh(&x->lock);
1434         xfrm_state_put(x);
1435         return 0;
1436 }
1437
1438 static inline int event2poltype(int event)
1439 {
1440         switch (event) {
1441         case XFRM_MSG_DELPOLICY:
1442                 return SADB_X_SPDDELETE;
1443         case XFRM_MSG_NEWPOLICY:
1444                 return SADB_X_SPDADD;
1445         case XFRM_MSG_UPDPOLICY:
1446                 return SADB_X_SPDUPDATE;
1447         case XFRM_MSG_POLEXPIRE:
1448         //      return SADB_X_SPDEXPIRE;
1449         default:
1450                 pr_err("pfkey: Unknown policy event %d\n", event);
1451                 break;
1452         }
1453
1454         return 0;
1455 }
1456
1457 static inline int event2keytype(int event)
1458 {
1459         switch (event) {
1460         case XFRM_MSG_DELSA:
1461                 return SADB_DELETE;
1462         case XFRM_MSG_NEWSA:
1463                 return SADB_ADD;
1464         case XFRM_MSG_UPDSA:
1465                 return SADB_UPDATE;
1466         case XFRM_MSG_EXPIRE:
1467                 return SADB_EXPIRE;
1468         default:
1469                 pr_err("pfkey: Unknown SA event %d\n", event);
1470                 break;
1471         }
1472
1473         return 0;
1474 }
1475
1476 /* ADD/UPD/DEL */
1477 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1478 {
1479         struct sk_buff *skb;
1480         struct sadb_msg *hdr;
1481
1482         skb = pfkey_xfrm_state2msg(x);
1483
1484         if (IS_ERR(skb))
1485                 return PTR_ERR(skb);
1486
1487         hdr = (struct sadb_msg *) skb->data;
1488         hdr->sadb_msg_version = PF_KEY_V2;
1489         hdr->sadb_msg_type = event2keytype(c->event);
1490         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1491         hdr->sadb_msg_errno = 0;
1492         hdr->sadb_msg_reserved = 0;
1493         hdr->sadb_msg_seq = c->seq;
1494         hdr->sadb_msg_pid = c->portid;
1495
1496         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1497
1498         return 0;
1499 }
1500
1501 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1502 {
1503         struct net *net = sock_net(sk);
1504         struct xfrm_state *x;
1505         int err;
1506         struct km_event c;
1507
1508         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1509         if (IS_ERR(x))
1510                 return PTR_ERR(x);
1511
1512         xfrm_state_hold(x);
1513         if (hdr->sadb_msg_type == SADB_ADD)
1514                 err = xfrm_state_add(x);
1515         else
1516                 err = xfrm_state_update(x);
1517
1518         xfrm_audit_state_add(x, err ? 0 : 1, true);
1519
1520         if (err < 0) {
1521                 x->km.state = XFRM_STATE_DEAD;
1522                 __xfrm_state_put(x);
1523                 goto out;
1524         }
1525
1526         if (hdr->sadb_msg_type == SADB_ADD)
1527                 c.event = XFRM_MSG_NEWSA;
1528         else
1529                 c.event = XFRM_MSG_UPDSA;
1530         c.seq = hdr->sadb_msg_seq;
1531         c.portid = hdr->sadb_msg_pid;
1532         km_state_notify(x, &c);
1533 out:
1534         xfrm_state_put(x);
1535         return err;
1536 }
1537
1538 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1539 {
1540         struct net *net = sock_net(sk);
1541         struct xfrm_state *x;
1542         struct km_event c;
1543         int err;
1544
1545         if (!ext_hdrs[SADB_EXT_SA-1] ||
1546             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548                 return -EINVAL;
1549
1550         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551         if (x == NULL)
1552                 return -ESRCH;
1553
1554         if ((err = security_xfrm_state_delete(x)))
1555                 goto out;
1556
1557         if (xfrm_state_kern(x)) {
1558                 err = -EPERM;
1559                 goto out;
1560         }
1561
1562         err = xfrm_state_delete(x);
1563
1564         if (err < 0)
1565                 goto out;
1566
1567         c.seq = hdr->sadb_msg_seq;
1568         c.portid = hdr->sadb_msg_pid;
1569         c.event = XFRM_MSG_DELSA;
1570         km_state_notify(x, &c);
1571 out:
1572         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1573         xfrm_state_put(x);
1574
1575         return err;
1576 }
1577
1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1579 {
1580         struct net *net = sock_net(sk);
1581         __u8 proto;
1582         struct sk_buff *out_skb;
1583         struct sadb_msg *out_hdr;
1584         struct xfrm_state *x;
1585
1586         if (!ext_hdrs[SADB_EXT_SA-1] ||
1587             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1588                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1589                 return -EINVAL;
1590
1591         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1592         if (x == NULL)
1593                 return -ESRCH;
1594
1595         out_skb = pfkey_xfrm_state2msg(x);
1596         proto = x->id.proto;
1597         xfrm_state_put(x);
1598         if (IS_ERR(out_skb))
1599                 return  PTR_ERR(out_skb);
1600
1601         out_hdr = (struct sadb_msg *) out_skb->data;
1602         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1603         out_hdr->sadb_msg_type = SADB_GET;
1604         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1605         out_hdr->sadb_msg_errno = 0;
1606         out_hdr->sadb_msg_reserved = 0;
1607         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1608         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1609         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1610
1611         return 0;
1612 }
1613
1614 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1615                                               gfp_t allocation)
1616 {
1617         struct sk_buff *skb;
1618         struct sadb_msg *hdr;
1619         int len, auth_len, enc_len, i;
1620
1621         auth_len = xfrm_count_pfkey_auth_supported();
1622         if (auth_len) {
1623                 auth_len *= sizeof(struct sadb_alg);
1624                 auth_len += sizeof(struct sadb_supported);
1625         }
1626
1627         enc_len = xfrm_count_pfkey_enc_supported();
1628         if (enc_len) {
1629                 enc_len *= sizeof(struct sadb_alg);
1630                 enc_len += sizeof(struct sadb_supported);
1631         }
1632
1633         len = enc_len + auth_len + sizeof(struct sadb_msg);
1634
1635         skb = alloc_skb(len + 16, allocation);
1636         if (!skb)
1637                 goto out_put_algs;
1638
1639         hdr = skb_put(skb, sizeof(*hdr));
1640         pfkey_hdr_dup(hdr, orig);
1641         hdr->sadb_msg_errno = 0;
1642         hdr->sadb_msg_len = len / sizeof(uint64_t);
1643
1644         if (auth_len) {
1645                 struct sadb_supported *sp;
1646                 struct sadb_alg *ap;
1647
1648                 sp = skb_put(skb, auth_len);
1649                 ap = (struct sadb_alg *) (sp + 1);
1650
1651                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1652                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1653
1654                 for (i = 0; ; i++) {
1655                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1656                         if (!aalg)
1657                                 break;
1658                         if (!aalg->pfkey_supported)
1659                                 continue;
1660                         if (aalg->available)
1661                                 *ap++ = aalg->desc;
1662                 }
1663         }
1664
1665         if (enc_len) {
1666                 struct sadb_supported *sp;
1667                 struct sadb_alg *ap;
1668
1669                 sp = skb_put(skb, enc_len);
1670                 ap = (struct sadb_alg *) (sp + 1);
1671
1672                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1673                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1674
1675                 for (i = 0; ; i++) {
1676                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1677                         if (!ealg)
1678                                 break;
1679                         if (!ealg->pfkey_supported)
1680                                 continue;
1681                         if (ealg->available)
1682                                 *ap++ = ealg->desc;
1683                 }
1684         }
1685
1686 out_put_algs:
1687         return skb;
1688 }
1689
1690 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1691 {
1692         struct pfkey_sock *pfk = pfkey_sk(sk);
1693         struct sk_buff *supp_skb;
1694
1695         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1696                 return -EINVAL;
1697
1698         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1699                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1700                         return -EEXIST;
1701                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1702         }
1703
1704         xfrm_probe_algs();
1705
1706         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1707         if (!supp_skb) {
1708                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1709                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1710
1711                 return -ENOBUFS;
1712         }
1713
1714         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1715                         sock_net(sk));
1716         return 0;
1717 }
1718
1719 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1720 {
1721         struct sk_buff *skb;
1722         struct sadb_msg *hdr;
1723
1724         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1725         if (!skb)
1726                 return -ENOBUFS;
1727
1728         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1729         hdr->sadb_msg_errno = (uint8_t) 0;
1730         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1731
1732         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1733                                sock_net(sk));
1734 }
1735
1736 static int key_notify_sa_flush(const struct km_event *c)
1737 {
1738         struct sk_buff *skb;
1739         struct sadb_msg *hdr;
1740
1741         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1742         if (!skb)
1743                 return -ENOBUFS;
1744         hdr = skb_put(skb, sizeof(struct sadb_msg));
1745         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1746         hdr->sadb_msg_type = SADB_FLUSH;
1747         hdr->sadb_msg_seq = c->seq;
1748         hdr->sadb_msg_pid = c->portid;
1749         hdr->sadb_msg_version = PF_KEY_V2;
1750         hdr->sadb_msg_errno = (uint8_t) 0;
1751         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1752         hdr->sadb_msg_reserved = 0;
1753
1754         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1755
1756         return 0;
1757 }
1758
1759 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1760 {
1761         struct net *net = sock_net(sk);
1762         unsigned int proto;
1763         struct km_event c;
1764         int err, err2;
1765
1766         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1767         if (proto == 0)
1768                 return -EINVAL;
1769
1770         err = xfrm_state_flush(net, proto, true, false);
1771         err2 = unicast_flush_resp(sk, hdr);
1772         if (err || err2) {
1773                 if (err == -ESRCH) /* empty table - go quietly */
1774                         err = 0;
1775                 return err ? err : err2;
1776         }
1777
1778         c.data.proto = proto;
1779         c.seq = hdr->sadb_msg_seq;
1780         c.portid = hdr->sadb_msg_pid;
1781         c.event = XFRM_MSG_FLUSHSA;
1782         c.net = net;
1783         km_state_notify(NULL, &c);
1784
1785         return 0;
1786 }
1787
1788 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1789 {
1790         struct pfkey_sock *pfk = ptr;
1791         struct sk_buff *out_skb;
1792         struct sadb_msg *out_hdr;
1793
1794         if (!pfkey_can_dump(&pfk->sk))
1795                 return -ENOBUFS;
1796
1797         out_skb = pfkey_xfrm_state2msg(x);
1798         if (IS_ERR(out_skb))
1799                 return PTR_ERR(out_skb);
1800
1801         out_hdr = (struct sadb_msg *) out_skb->data;
1802         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1803         out_hdr->sadb_msg_type = SADB_DUMP;
1804         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1805         out_hdr->sadb_msg_errno = 0;
1806         out_hdr->sadb_msg_reserved = 0;
1807         out_hdr->sadb_msg_seq = count + 1;
1808         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1809
1810         if (pfk->dump.skb)
1811                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1812                                 &pfk->sk, sock_net(&pfk->sk));
1813         pfk->dump.skb = out_skb;
1814
1815         return 0;
1816 }
1817
1818 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1819 {
1820         struct net *net = sock_net(&pfk->sk);
1821         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1822 }
1823
1824 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1825 {
1826         struct net *net = sock_net(&pfk->sk);
1827
1828         xfrm_state_walk_done(&pfk->dump.u.state, net);
1829 }
1830
1831 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1832 {
1833         u8 proto;
1834         struct xfrm_address_filter *filter = NULL;
1835         struct pfkey_sock *pfk = pfkey_sk(sk);
1836
1837         mutex_lock(&pfk->dump_lock);
1838         if (pfk->dump.dump != NULL) {
1839                 mutex_unlock(&pfk->dump_lock);
1840                 return -EBUSY;
1841         }
1842
1843         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1844         if (proto == 0) {
1845                 mutex_unlock(&pfk->dump_lock);
1846                 return -EINVAL;
1847         }
1848
1849         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1850                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1851
1852                 if ((xfilter->sadb_x_filter_splen >=
1853                         (sizeof(xfrm_address_t) << 3)) ||
1854                     (xfilter->sadb_x_filter_dplen >=
1855                         (sizeof(xfrm_address_t) << 3))) {
1856                         mutex_unlock(&pfk->dump_lock);
1857                         return -EINVAL;
1858                 }
1859                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1860                 if (filter == NULL) {
1861                         mutex_unlock(&pfk->dump_lock);
1862                         return -ENOMEM;
1863                 }
1864
1865                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1866                        sizeof(xfrm_address_t));
1867                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1868                        sizeof(xfrm_address_t));
1869                 filter->family = xfilter->sadb_x_filter_family;
1870                 filter->splen = xfilter->sadb_x_filter_splen;
1871                 filter->dplen = xfilter->sadb_x_filter_dplen;
1872         }
1873
1874         pfk->dump.msg_version = hdr->sadb_msg_version;
1875         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1876         pfk->dump.dump = pfkey_dump_sa;
1877         pfk->dump.done = pfkey_dump_sa_done;
1878         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1879         mutex_unlock(&pfk->dump_lock);
1880
1881         return pfkey_do_dump(pfk);
1882 }
1883
1884 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1885 {
1886         struct pfkey_sock *pfk = pfkey_sk(sk);
1887         int satype = hdr->sadb_msg_satype;
1888         bool reset_errno = false;
1889
1890         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1891                 reset_errno = true;
1892                 if (satype != 0 && satype != 1)
1893                         return -EINVAL;
1894                 pfk->promisc = satype;
1895         }
1896         if (reset_errno && skb_cloned(skb))
1897                 skb = skb_copy(skb, GFP_KERNEL);
1898         else
1899                 skb = skb_clone(skb, GFP_KERNEL);
1900
1901         if (reset_errno && skb) {
1902                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1903                 new_hdr->sadb_msg_errno = 0;
1904         }
1905
1906         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1907         return 0;
1908 }
1909
1910 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1911 {
1912         int i;
1913         u32 reqid = *(u32*)ptr;
1914
1915         for (i=0; i<xp->xfrm_nr; i++) {
1916                 if (xp->xfrm_vec[i].reqid == reqid)
1917                         return -EEXIST;
1918         }
1919         return 0;
1920 }
1921
1922 static u32 gen_reqid(struct net *net)
1923 {
1924         struct xfrm_policy_walk walk;
1925         u32 start;
1926         int rc;
1927         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1928
1929         start = reqid;
1930         do {
1931                 ++reqid;
1932                 if (reqid == 0)
1933                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1934                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1935                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1936                 xfrm_policy_walk_done(&walk, net);
1937                 if (rc != -EEXIST)
1938                         return reqid;
1939         } while (reqid != start);
1940         return 0;
1941 }
1942
1943 static int
1944 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1945 {
1946         struct net *net = xp_net(xp);
1947         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1948         int mode;
1949
1950         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1951                 return -ELOOP;
1952
1953         if (rq->sadb_x_ipsecrequest_mode == 0)
1954                 return -EINVAL;
1955         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1956                 return -EINVAL;
1957
1958         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1959         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1960                 return -EINVAL;
1961         t->mode = mode;
1962         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1963                 t->optional = 1;
1964         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1965                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1966                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1967                         t->reqid = 0;
1968                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1969                         return -ENOBUFS;
1970         }
1971
1972         /* addresses present only in tunnel mode */
1973         if (t->mode == XFRM_MODE_TUNNEL) {
1974                 int err;
1975
1976                 err = parse_sockaddr_pair(
1977                         (struct sockaddr *)(rq + 1),
1978                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1979                         &t->saddr, &t->id.daddr, &t->encap_family);
1980                 if (err)
1981                         return err;
1982         } else
1983                 t->encap_family = xp->family;
1984
1985         /* No way to set this via kame pfkey */
1986         t->allalgs = 1;
1987         xp->xfrm_nr++;
1988         return 0;
1989 }
1990
1991 static int
1992 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1993 {
1994         int err;
1995         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1996         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1997
1998         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1999                 return -EINVAL;
2000
2001         while (len >= sizeof(*rq)) {
2002                 if (len < rq->sadb_x_ipsecrequest_len ||
2003                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2004                         return -EINVAL;
2005
2006                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2007                         return err;
2008                 len -= rq->sadb_x_ipsecrequest_len;
2009                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2010         }
2011         return 0;
2012 }
2013
2014 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2015 {
2016         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2017
2018         if (xfrm_ctx) {
2019                 int len = sizeof(struct sadb_x_sec_ctx);
2020                 len += xfrm_ctx->ctx_len;
2021                 return PFKEY_ALIGN8(len);
2022         }
2023         return 0;
2024 }
2025
2026 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2027 {
2028         const struct xfrm_tmpl *t;
2029         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2030         int socklen = 0;
2031         int i;
2032
2033         for (i=0; i<xp->xfrm_nr; i++) {
2034                 t = xp->xfrm_vec + i;
2035                 socklen += pfkey_sockaddr_len(t->encap_family);
2036         }
2037
2038         return sizeof(struct sadb_msg) +
2039                 (sizeof(struct sadb_lifetime) * 3) +
2040                 (sizeof(struct sadb_address) * 2) +
2041                 (sockaddr_size * 2) +
2042                 sizeof(struct sadb_x_policy) +
2043                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2044                 (socklen * 2) +
2045                 pfkey_xfrm_policy2sec_ctx_size(xp);
2046 }
2047
2048 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2049 {
2050         struct sk_buff *skb;
2051         int size;
2052
2053         size = pfkey_xfrm_policy2msg_size(xp);
2054
2055         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2056         if (skb == NULL)
2057                 return ERR_PTR(-ENOBUFS);
2058
2059         return skb;
2060 }
2061
2062 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2063 {
2064         struct sadb_msg *hdr;
2065         struct sadb_address *addr;
2066         struct sadb_lifetime *lifetime;
2067         struct sadb_x_policy *pol;
2068         struct sadb_x_sec_ctx *sec_ctx;
2069         struct xfrm_sec_ctx *xfrm_ctx;
2070         int i;
2071         int size;
2072         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2073         int socklen = pfkey_sockaddr_len(xp->family);
2074
2075         size = pfkey_xfrm_policy2msg_size(xp);
2076
2077         /* call should fill header later */
2078         hdr = skb_put(skb, sizeof(struct sadb_msg));
2079         memset(hdr, 0, size);   /* XXX do we need this ? */
2080
2081         /* src address */
2082         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2083         addr->sadb_address_len =
2084                 (sizeof(struct sadb_address)+sockaddr_size)/
2085                         sizeof(uint64_t);
2086         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2087         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2088         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2089         addr->sadb_address_reserved = 0;
2090         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2091                                  xp->selector.sport,
2092                                  (struct sockaddr *) (addr + 1),
2093                                  xp->family))
2094                 BUG();
2095
2096         /* dst address */
2097         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2098         addr->sadb_address_len =
2099                 (sizeof(struct sadb_address)+sockaddr_size)/
2100                         sizeof(uint64_t);
2101         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2102         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2103         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2104         addr->sadb_address_reserved = 0;
2105
2106         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2107                             (struct sockaddr *) (addr + 1),
2108                             xp->family);
2109
2110         /* hard time */
2111         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2112         lifetime->sadb_lifetime_len =
2113                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2114         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2115         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2116         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2117         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2118         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2119         /* soft time */
2120         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2121         lifetime->sadb_lifetime_len =
2122                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2123         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2124         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2125         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2126         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2127         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2128         /* current time */
2129         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2130         lifetime->sadb_lifetime_len =
2131                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2132         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2133         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2134         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2135         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2136         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2137
2138         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2139         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2140         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2141         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2142         if (xp->action == XFRM_POLICY_ALLOW) {
2143                 if (xp->xfrm_nr)
2144                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2145                 else
2146                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2147         }
2148         pol->sadb_x_policy_dir = dir+1;
2149         pol->sadb_x_policy_reserved = 0;
2150         pol->sadb_x_policy_id = xp->index;
2151         pol->sadb_x_policy_priority = xp->priority;
2152
2153         for (i=0; i<xp->xfrm_nr; i++) {
2154                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2155                 struct sadb_x_ipsecrequest *rq;
2156                 int req_size;
2157                 int mode;
2158
2159                 req_size = sizeof(struct sadb_x_ipsecrequest);
2160                 if (t->mode == XFRM_MODE_TUNNEL) {
2161                         socklen = pfkey_sockaddr_len(t->encap_family);
2162                         req_size += socklen * 2;
2163                 } else {
2164                         size -= 2*socklen;
2165                 }
2166                 rq = skb_put(skb, req_size);
2167                 pol->sadb_x_policy_len += req_size/8;
2168                 memset(rq, 0, sizeof(*rq));
2169                 rq->sadb_x_ipsecrequest_len = req_size;
2170                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2171                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2172                         return -EINVAL;
2173                 rq->sadb_x_ipsecrequest_mode = mode;
2174                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2175                 if (t->reqid)
2176                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2177                 if (t->optional)
2178                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2179                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2180
2181                 if (t->mode == XFRM_MODE_TUNNEL) {
2182                         u8 *sa = (void *)(rq + 1);
2183                         pfkey_sockaddr_fill(&t->saddr, 0,
2184                                             (struct sockaddr *)sa,
2185                                             t->encap_family);
2186                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2187                                             (struct sockaddr *) (sa + socklen),
2188                                             t->encap_family);
2189                 }
2190         }
2191
2192         /* security context */
2193         if ((xfrm_ctx = xp->security)) {
2194                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2195
2196                 sec_ctx = skb_put(skb, ctx_size);
2197                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2198                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2199                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2200                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2201                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2202                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2203                        xfrm_ctx->ctx_len);
2204         }
2205
2206         hdr->sadb_msg_len = size / sizeof(uint64_t);
2207         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2208
2209         return 0;
2210 }
2211
2212 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2213 {
2214         struct sk_buff *out_skb;
2215         struct sadb_msg *out_hdr;
2216         int err;
2217
2218         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2219         if (IS_ERR(out_skb))
2220                 return PTR_ERR(out_skb);
2221
2222         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2223         if (err < 0) {
2224                 kfree_skb(out_skb);
2225                 return err;
2226         }
2227
2228         out_hdr = (struct sadb_msg *) out_skb->data;
2229         out_hdr->sadb_msg_version = PF_KEY_V2;
2230
2231         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2232                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2233         else
2234                 out_hdr->sadb_msg_type = event2poltype(c->event);
2235         out_hdr->sadb_msg_errno = 0;
2236         out_hdr->sadb_msg_seq = c->seq;
2237         out_hdr->sadb_msg_pid = c->portid;
2238         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2239         return 0;
2240
2241 }
2242
2243 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2244 {
2245         struct net *net = sock_net(sk);
2246         int err = 0;
2247         struct sadb_lifetime *lifetime;
2248         struct sadb_address *sa;
2249         struct sadb_x_policy *pol;
2250         struct xfrm_policy *xp;
2251         struct km_event c;
2252         struct sadb_x_sec_ctx *sec_ctx;
2253
2254         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2255                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2256             !ext_hdrs[SADB_X_EXT_POLICY-1])
2257                 return -EINVAL;
2258
2259         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2260         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2261                 return -EINVAL;
2262         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2263                 return -EINVAL;
2264
2265         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2266         if (xp == NULL)
2267                 return -ENOBUFS;
2268
2269         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2270                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2271         xp->priority = pol->sadb_x_policy_priority;
2272
2273         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2274         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2275         xp->selector.family = xp->family;
2276         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2277         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2278         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2279         if (xp->selector.sport)
2280                 xp->selector.sport_mask = htons(0xffff);
2281
2282         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2283         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2284         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2285
2286         /* Amusing, we set this twice.  KAME apps appear to set same value
2287          * in both addresses.
2288          */
2289         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2290
2291         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2292         if (xp->selector.dport)
2293                 xp->selector.dport_mask = htons(0xffff);
2294
2295         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2296         if (sec_ctx != NULL) {
2297                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2298
2299                 if (!uctx) {
2300                         err = -ENOBUFS;
2301                         goto out;
2302                 }
2303
2304                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2305                 kfree(uctx);
2306
2307                 if (err)
2308                         goto out;
2309         }
2310
2311         xp->lft.soft_byte_limit = XFRM_INF;
2312         xp->lft.hard_byte_limit = XFRM_INF;
2313         xp->lft.soft_packet_limit = XFRM_INF;
2314         xp->lft.hard_packet_limit = XFRM_INF;
2315         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2316                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2317                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2318                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2319                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2320         }
2321         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2322                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2323                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2324                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2325                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2326         }
2327         xp->xfrm_nr = 0;
2328         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2329             (err = parse_ipsecrequests(xp, pol)) < 0)
2330                 goto out;
2331
2332         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2333                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2334
2335         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2336
2337         if (err)
2338                 goto out;
2339
2340         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2341                 c.event = XFRM_MSG_UPDPOLICY;
2342         else
2343                 c.event = XFRM_MSG_NEWPOLICY;
2344
2345         c.seq = hdr->sadb_msg_seq;
2346         c.portid = hdr->sadb_msg_pid;
2347
2348         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2349         xfrm_pol_put(xp);
2350         return 0;
2351
2352 out:
2353         xp->walk.dead = 1;
2354         xfrm_policy_destroy(xp);
2355         return err;
2356 }
2357
2358 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2359 {
2360         struct net *net = sock_net(sk);
2361         int err;
2362         struct sadb_address *sa;
2363         struct sadb_x_policy *pol;
2364         struct xfrm_policy *xp;
2365         struct xfrm_selector sel;
2366         struct km_event c;
2367         struct sadb_x_sec_ctx *sec_ctx;
2368         struct xfrm_sec_ctx *pol_ctx = NULL;
2369
2370         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2371                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2372             !ext_hdrs[SADB_X_EXT_POLICY-1])
2373                 return -EINVAL;
2374
2375         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2376         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2377                 return -EINVAL;
2378
2379         memset(&sel, 0, sizeof(sel));
2380
2381         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2382         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2383         sel.prefixlen_s = sa->sadb_address_prefixlen;
2384         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2385         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2386         if (sel.sport)
2387                 sel.sport_mask = htons(0xffff);
2388
2389         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2390         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2391         sel.prefixlen_d = sa->sadb_address_prefixlen;
2392         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2393         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2394         if (sel.dport)
2395                 sel.dport_mask = htons(0xffff);
2396
2397         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2398         if (sec_ctx != NULL) {
2399                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2400
2401                 if (!uctx)
2402                         return -ENOMEM;
2403
2404                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2405                 kfree(uctx);
2406                 if (err)
2407                         return err;
2408         }
2409
2410         xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2411                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2412                                    1, &err);
2413         security_xfrm_policy_free(pol_ctx);
2414         if (xp == NULL)
2415                 return -ENOENT;
2416
2417         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2418
2419         if (err)
2420                 goto out;
2421
2422         c.seq = hdr->sadb_msg_seq;
2423         c.portid = hdr->sadb_msg_pid;
2424         c.data.byid = 0;
2425         c.event = XFRM_MSG_DELPOLICY;
2426         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2427
2428 out:
2429         xfrm_pol_put(xp);
2430         return err;
2431 }
2432
2433 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2434 {
2435         int err;
2436         struct sk_buff *out_skb;
2437         struct sadb_msg *out_hdr;
2438         err = 0;
2439
2440         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2441         if (IS_ERR(out_skb)) {
2442                 err =  PTR_ERR(out_skb);
2443                 goto out;
2444         }
2445         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2446         if (err < 0) {
2447                 kfree_skb(out_skb);
2448                 goto out;
2449         }
2450
2451         out_hdr = (struct sadb_msg *) out_skb->data;
2452         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2453         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2454         out_hdr->sadb_msg_satype = 0;
2455         out_hdr->sadb_msg_errno = 0;
2456         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2457         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2458         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2459         err = 0;
2460
2461 out:
2462         return err;
2463 }
2464
2465 static int pfkey_sockaddr_pair_size(sa_family_t family)
2466 {
2467         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2468 }
2469
2470 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2471                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2472                                u16 *family)
2473 {
2474         int af, socklen;
2475
2476         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2477                 return -EINVAL;
2478
2479         af = pfkey_sockaddr_extract(sa, saddr);
2480         if (!af)
2481                 return -EINVAL;
2482
2483         socklen = pfkey_sockaddr_len(af);
2484         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2485                                    daddr) != af)
2486                 return -EINVAL;
2487
2488         *family = af;
2489         return 0;
2490 }
2491
2492 #ifdef CONFIG_NET_KEY_MIGRATE
2493 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2494                                     struct xfrm_migrate *m)
2495 {
2496         int err;
2497         struct sadb_x_ipsecrequest *rq2;
2498         int mode;
2499
2500         if (len < sizeof(*rq1) ||
2501             len < rq1->sadb_x_ipsecrequest_len ||
2502             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2503                 return -EINVAL;
2504
2505         /* old endoints */
2506         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2507                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2508                                   &m->old_saddr, &m->old_daddr,
2509                                   &m->old_family);
2510         if (err)
2511                 return err;
2512
2513         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2514         len -= rq1->sadb_x_ipsecrequest_len;
2515
2516         if (len <= sizeof(*rq2) ||
2517             len < rq2->sadb_x_ipsecrequest_len ||
2518             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2519                 return -EINVAL;
2520
2521         /* new endpoints */
2522         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2523                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2524                                   &m->new_saddr, &m->new_daddr,
2525                                   &m->new_family);
2526         if (err)
2527                 return err;
2528
2529         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2530             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2531             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2532                 return -EINVAL;
2533
2534         m->proto = rq1->sadb_x_ipsecrequest_proto;
2535         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2536                 return -EINVAL;
2537         m->mode = mode;
2538         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2539
2540         return ((int)(rq1->sadb_x_ipsecrequest_len +
2541                       rq2->sadb_x_ipsecrequest_len));
2542 }
2543
2544 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2545                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2546 {
2547         int i, len, ret, err = -EINVAL;
2548         u8 dir;
2549         struct sadb_address *sa;
2550         struct sadb_x_kmaddress *kma;
2551         struct sadb_x_policy *pol;
2552         struct sadb_x_ipsecrequest *rq;
2553         struct xfrm_selector sel;
2554         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2555         struct xfrm_kmaddress k;
2556         struct net *net = sock_net(sk);
2557
2558         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2559                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2560             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2561                 err = -EINVAL;
2562                 goto out;
2563         }
2564
2565         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2566         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2567
2568         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2569                 err = -EINVAL;
2570                 goto out;
2571         }
2572
2573         if (kma) {
2574                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2575                 k.reserved = kma->sadb_x_kmaddress_reserved;
2576                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2577                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2578                                           &k.local, &k.remote, &k.family);
2579                 if (ret < 0) {
2580                         err = ret;
2581                         goto out;
2582                 }
2583         }
2584
2585         dir = pol->sadb_x_policy_dir - 1;
2586         memset(&sel, 0, sizeof(sel));
2587
2588         /* set source address info of selector */
2589         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2590         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2591         sel.prefixlen_s = sa->sadb_address_prefixlen;
2592         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2593         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2594         if (sel.sport)
2595                 sel.sport_mask = htons(0xffff);
2596
2597         /* set destination address info of selector */
2598         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2599         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2600         sel.prefixlen_d = sa->sadb_address_prefixlen;
2601         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2602         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2603         if (sel.dport)
2604                 sel.dport_mask = htons(0xffff);
2605
2606         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2607
2608         /* extract ipsecrequests */
2609         i = 0;
2610         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2611
2612         while (len > 0 && i < XFRM_MAX_DEPTH) {
2613                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2614                 if (ret < 0) {
2615                         err = ret;
2616                         goto out;
2617                 } else {
2618                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2619                         len -= ret;
2620                         i++;
2621                 }
2622         }
2623
2624         if (!i || len > 0) {
2625                 err = -EINVAL;
2626                 goto out;
2627         }
2628
2629         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2630                             kma ? &k : NULL, net, NULL);
2631
2632  out:
2633         return err;
2634 }
2635 #else
2636 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2637                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2638 {
2639         return -ENOPROTOOPT;
2640 }
2641 #endif
2642
2643
2644 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2645 {
2646         struct net *net = sock_net(sk);
2647         unsigned int dir;
2648         int err = 0, delete;
2649         struct sadb_x_policy *pol;
2650         struct xfrm_policy *xp;
2651         struct km_event c;
2652
2653         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2654                 return -EINVAL;
2655
2656         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2657         if (dir >= XFRM_POLICY_MAX)
2658                 return -EINVAL;
2659
2660         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2661         xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2662                               dir, pol->sadb_x_policy_id, delete, &err);
2663         if (xp == NULL)
2664                 return -ENOENT;
2665
2666         if (delete) {
2667                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2668
2669                 if (err)
2670                         goto out;
2671                 c.seq = hdr->sadb_msg_seq;
2672                 c.portid = hdr->sadb_msg_pid;
2673                 c.data.byid = 1;
2674                 c.event = XFRM_MSG_DELPOLICY;
2675                 km_policy_notify(xp, dir, &c);
2676         } else {
2677                 err = key_pol_get_resp(sk, xp, hdr, dir);
2678         }
2679
2680 out:
2681         xfrm_pol_put(xp);
2682         return err;
2683 }
2684
2685 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2686 {
2687         struct pfkey_sock *pfk = ptr;
2688         struct sk_buff *out_skb;
2689         struct sadb_msg *out_hdr;
2690         int err;
2691
2692         if (!pfkey_can_dump(&pfk->sk))
2693                 return -ENOBUFS;
2694
2695         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2696         if (IS_ERR(out_skb))
2697                 return PTR_ERR(out_skb);
2698
2699         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2700         if (err < 0) {
2701                 kfree_skb(out_skb);
2702                 return err;
2703         }
2704
2705         out_hdr = (struct sadb_msg *) out_skb->data;
2706         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2707         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2708         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2709         out_hdr->sadb_msg_errno = 0;
2710         out_hdr->sadb_msg_seq = count + 1;
2711         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2712
2713         if (pfk->dump.skb)
2714                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2715                                 &pfk->sk, sock_net(&pfk->sk));
2716         pfk->dump.skb = out_skb;
2717
2718         return 0;
2719 }
2720
2721 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2722 {
2723         struct net *net = sock_net(&pfk->sk);
2724         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2725 }
2726
2727 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2728 {
2729         struct net *net = sock_net((struct sock *)pfk);
2730
2731         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2732 }
2733
2734 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2735 {
2736         struct pfkey_sock *pfk = pfkey_sk(sk);
2737
2738         mutex_lock(&pfk->dump_lock);
2739         if (pfk->dump.dump != NULL) {
2740                 mutex_unlock(&pfk->dump_lock);
2741                 return -EBUSY;
2742         }
2743
2744         pfk->dump.msg_version = hdr->sadb_msg_version;
2745         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2746         pfk->dump.dump = pfkey_dump_sp;
2747         pfk->dump.done = pfkey_dump_sp_done;
2748         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2749         mutex_unlock(&pfk->dump_lock);
2750
2751         return pfkey_do_dump(pfk);
2752 }
2753
2754 static int key_notify_policy_flush(const struct km_event *c)
2755 {
2756         struct sk_buff *skb_out;
2757         struct sadb_msg *hdr;
2758
2759         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2760         if (!skb_out)
2761                 return -ENOBUFS;
2762         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2763         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2764         hdr->sadb_msg_seq = c->seq;
2765         hdr->sadb_msg_pid = c->portid;
2766         hdr->sadb_msg_version = PF_KEY_V2;
2767         hdr->sadb_msg_errno = (uint8_t) 0;
2768         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2769         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2770         hdr->sadb_msg_reserved = 0;
2771         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2772         return 0;
2773
2774 }
2775
2776 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2777 {
2778         struct net *net = sock_net(sk);
2779         struct km_event c;
2780         int err, err2;
2781
2782         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2783         err2 = unicast_flush_resp(sk, hdr);
2784         if (err || err2) {
2785                 if (err == -ESRCH) /* empty table - old silent behavior */
2786                         return 0;
2787                 return err;
2788         }
2789
2790         c.data.type = XFRM_POLICY_TYPE_MAIN;
2791         c.event = XFRM_MSG_FLUSHPOLICY;
2792         c.portid = hdr->sadb_msg_pid;
2793         c.seq = hdr->sadb_msg_seq;
2794         c.net = net;
2795         km_policy_notify(NULL, 0, &c);
2796
2797         return 0;
2798 }
2799
2800 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2801                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2802 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2803         [SADB_RESERVED]         = pfkey_reserved,
2804         [SADB_GETSPI]           = pfkey_getspi,
2805         [SADB_UPDATE]           = pfkey_add,
2806         [SADB_ADD]              = pfkey_add,
2807         [SADB_DELETE]           = pfkey_delete,
2808         [SADB_GET]              = pfkey_get,
2809         [SADB_ACQUIRE]          = pfkey_acquire,
2810         [SADB_REGISTER]         = pfkey_register,
2811         [SADB_EXPIRE]           = NULL,
2812         [SADB_FLUSH]            = pfkey_flush,
2813         [SADB_DUMP]             = pfkey_dump,
2814         [SADB_X_PROMISC]        = pfkey_promisc,
2815         [SADB_X_PCHANGE]        = NULL,
2816         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2817         [SADB_X_SPDADD]         = pfkey_spdadd,
2818         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2819         [SADB_X_SPDGET]         = pfkey_spdget,
2820         [SADB_X_SPDACQUIRE]     = NULL,
2821         [SADB_X_SPDDUMP]        = pfkey_spddump,
2822         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2823         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2824         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2825         [SADB_X_MIGRATE]        = pfkey_migrate,
2826 };
2827
2828 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2829 {
2830         void *ext_hdrs[SADB_EXT_MAX];
2831         int err;
2832
2833         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2834                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2835
2836         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2837         err = parse_exthdrs(skb, hdr, ext_hdrs);
2838         if (!err) {
2839                 err = -EOPNOTSUPP;
2840                 if (pfkey_funcs[hdr->sadb_msg_type])
2841                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2842         }
2843         return err;
2844 }
2845
2846 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2847 {
2848         struct sadb_msg *hdr = NULL;
2849
2850         if (skb->len < sizeof(*hdr)) {
2851                 *errp = -EMSGSIZE;
2852         } else {
2853                 hdr = (struct sadb_msg *) skb->data;
2854                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2855                     hdr->sadb_msg_reserved != 0 ||
2856                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2857                      hdr->sadb_msg_type > SADB_MAX)) {
2858                         hdr = NULL;
2859                         *errp = -EINVAL;
2860                 } else if (hdr->sadb_msg_len != (skb->len /
2861                                                  sizeof(uint64_t)) ||
2862                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2863                                                 sizeof(uint64_t))) {
2864                         hdr = NULL;
2865                         *errp = -EMSGSIZE;
2866                 } else {
2867                         *errp = 0;
2868                 }
2869         }
2870         return hdr;
2871 }
2872
2873 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2874                                 const struct xfrm_algo_desc *d)
2875 {
2876         unsigned int id = d->desc.sadb_alg_id;
2877
2878         if (id >= sizeof(t->aalgos) * 8)
2879                 return 0;
2880
2881         return (t->aalgos >> id) & 1;
2882 }
2883
2884 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2885                                 const struct xfrm_algo_desc *d)
2886 {
2887         unsigned int id = d->desc.sadb_alg_id;
2888
2889         if (id >= sizeof(t->ealgos) * 8)
2890                 return 0;
2891
2892         return (t->ealgos >> id) & 1;
2893 }
2894
2895 static int count_ah_combs(const struct xfrm_tmpl *t)
2896 {
2897         int i, sz = 0;
2898
2899         for (i = 0; ; i++) {
2900                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2901                 if (!aalg)
2902                         break;
2903                 if (!aalg->pfkey_supported)
2904                         continue;
2905                 if (aalg_tmpl_set(t, aalg))
2906                         sz += sizeof(struct sadb_comb);
2907         }
2908         return sz + sizeof(struct sadb_prop);
2909 }
2910
2911 static int count_esp_combs(const struct xfrm_tmpl *t)
2912 {
2913         int i, k, sz = 0;
2914
2915         for (i = 0; ; i++) {
2916                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2917                 if (!ealg)
2918                         break;
2919
2920                 if (!ealg->pfkey_supported)
2921                         continue;
2922
2923                 if (!(ealg_tmpl_set(t, ealg)))
2924                         continue;
2925
2926                 for (k = 1; ; k++) {
2927                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2928                         if (!aalg)
2929                                 break;
2930
2931                         if (!aalg->pfkey_supported)
2932                                 continue;
2933
2934                         if (aalg_tmpl_set(t, aalg))
2935                                 sz += sizeof(struct sadb_comb);
2936                 }
2937         }
2938         return sz + sizeof(struct sadb_prop);
2939 }
2940
2941 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2942 {
2943         struct sadb_prop *p;
2944         int i;
2945
2946         p = skb_put(skb, sizeof(struct sadb_prop));
2947         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2948         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2949         p->sadb_prop_replay = 32;
2950         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2951
2952         for (i = 0; ; i++) {
2953                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2954                 if (!aalg)
2955                         break;
2956
2957                 if (!aalg->pfkey_supported)
2958                         continue;
2959
2960                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2961                         struct sadb_comb *c;
2962                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2963                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2964                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2965                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2966                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2967                         c->sadb_comb_hard_addtime = 24*60*60;
2968                         c->sadb_comb_soft_addtime = 20*60*60;
2969                         c->sadb_comb_hard_usetime = 8*60*60;
2970                         c->sadb_comb_soft_usetime = 7*60*60;
2971                 }
2972         }
2973 }
2974
2975 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2976 {
2977         struct sadb_prop *p;
2978         int i, k;
2979
2980         p = skb_put(skb, sizeof(struct sadb_prop));
2981         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2982         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2983         p->sadb_prop_replay = 32;
2984         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2985
2986         for (i=0; ; i++) {
2987                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2988                 if (!ealg)
2989                         break;
2990
2991                 if (!ealg->pfkey_supported)
2992                         continue;
2993
2994                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2995                         continue;
2996
2997                 for (k = 1; ; k++) {
2998                         struct sadb_comb *c;
2999                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3000                         if (!aalg)
3001                                 break;
3002                         if (!aalg->pfkey_supported)
3003                                 continue;
3004                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3005                                 continue;
3006                         c = skb_put(skb, sizeof(struct sadb_comb));
3007                         memset(c, 0, sizeof(*c));
3008                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3009                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3010                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3011                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3012                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3013                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3014                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3015                         c->sadb_comb_hard_addtime = 24*60*60;
3016                         c->sadb_comb_soft_addtime = 20*60*60;
3017                         c->sadb_comb_hard_usetime = 8*60*60;
3018                         c->sadb_comb_soft_usetime = 7*60*60;
3019                 }
3020         }
3021 }
3022
3023 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3024 {
3025         return 0;
3026 }
3027
3028 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3029 {
3030         struct sk_buff *out_skb;
3031         struct sadb_msg *out_hdr;
3032         int hard;
3033         int hsc;
3034
3035         hard = c->data.hard;
3036         if (hard)
3037                 hsc = 2;
3038         else
3039                 hsc = 1;
3040
3041         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3042         if (IS_ERR(out_skb))
3043                 return PTR_ERR(out_skb);
3044
3045         out_hdr = (struct sadb_msg *) out_skb->data;
3046         out_hdr->sadb_msg_version = PF_KEY_V2;
3047         out_hdr->sadb_msg_type = SADB_EXPIRE;
3048         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3049         out_hdr->sadb_msg_errno = 0;
3050         out_hdr->sadb_msg_reserved = 0;
3051         out_hdr->sadb_msg_seq = 0;
3052         out_hdr->sadb_msg_pid = 0;
3053
3054         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3055                         xs_net(x));
3056         return 0;
3057 }
3058
3059 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3060 {
3061         struct net *net = x ? xs_net(x) : c->net;
3062         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3063
3064         if (atomic_read(&net_pfkey->socks_nr) == 0)
3065                 return 0;
3066
3067         switch (c->event) {
3068         case XFRM_MSG_EXPIRE:
3069                 return key_notify_sa_expire(x, c);
3070         case XFRM_MSG_DELSA:
3071         case XFRM_MSG_NEWSA:
3072         case XFRM_MSG_UPDSA:
3073                 return key_notify_sa(x, c);
3074         case XFRM_MSG_FLUSHSA:
3075                 return key_notify_sa_flush(c);
3076         case XFRM_MSG_NEWAE: /* not yet supported */
3077                 break;
3078         default:
3079                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3080                 break;
3081         }
3082
3083         return 0;
3084 }
3085
3086 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3087 {
3088         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3089                 return 0;
3090
3091         switch (c->event) {
3092         case XFRM_MSG_POLEXPIRE:
3093                 return key_notify_policy_expire(xp, c);
3094         case XFRM_MSG_DELPOLICY:
3095         case XFRM_MSG_NEWPOLICY:
3096         case XFRM_MSG_UPDPOLICY:
3097                 return key_notify_policy(xp, dir, c);
3098         case XFRM_MSG_FLUSHPOLICY:
3099                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3100                         break;
3101                 return key_notify_policy_flush(c);
3102         default:
3103                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3104                 break;
3105         }
3106
3107         return 0;
3108 }
3109
3110 static u32 get_acqseq(void)
3111 {
3112         u32 res;
3113         static atomic_t acqseq;
3114
3115         do {
3116                 res = atomic_inc_return(&acqseq);
3117         } while (!res);
3118         return res;
3119 }
3120
3121 static bool pfkey_is_alive(const struct km_event *c)
3122 {
3123         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3124         struct sock *sk;
3125         bool is_alive = false;
3126
3127         rcu_read_lock();
3128         sk_for_each_rcu(sk, &net_pfkey->table) {
3129                 if (pfkey_sk(sk)->registered) {
3130                         is_alive = true;
3131                         break;
3132                 }
3133         }
3134         rcu_read_unlock();
3135
3136         return is_alive;
3137 }
3138
3139 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3140 {
3141         struct sk_buff *skb;
3142         struct sadb_msg *hdr;
3143         struct sadb_address *addr;
3144         struct sadb_x_policy *pol;
3145         int sockaddr_size;
3146         int size;
3147         struct sadb_x_sec_ctx *sec_ctx;
3148         struct xfrm_sec_ctx *xfrm_ctx;
3149         int ctx_size = 0;
3150
3151         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3152         if (!sockaddr_size)
3153                 return -EINVAL;
3154
3155         size = sizeof(struct sadb_msg) +
3156                 (sizeof(struct sadb_address) * 2) +
3157                 (sockaddr_size * 2) +
3158                 sizeof(struct sadb_x_policy);
3159
3160         if (x->id.proto == IPPROTO_AH)
3161                 size += count_ah_combs(t);
3162         else if (x->id.proto == IPPROTO_ESP)
3163                 size += count_esp_combs(t);
3164
3165         if ((xfrm_ctx = x->security)) {
3166                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3167                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3168         }
3169
3170         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3171         if (skb == NULL)
3172                 return -ENOMEM;
3173
3174         hdr = skb_put(skb, sizeof(struct sadb_msg));
3175         hdr->sadb_msg_version = PF_KEY_V2;
3176         hdr->sadb_msg_type = SADB_ACQUIRE;
3177         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3178         hdr->sadb_msg_len = size / sizeof(uint64_t);
3179         hdr->sadb_msg_errno = 0;
3180         hdr->sadb_msg_reserved = 0;
3181         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3182         hdr->sadb_msg_pid = 0;
3183
3184         /* src address */
3185         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3186         addr->sadb_address_len =
3187                 (sizeof(struct sadb_address)+sockaddr_size)/
3188                         sizeof(uint64_t);
3189         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3190         addr->sadb_address_proto = 0;
3191         addr->sadb_address_reserved = 0;
3192         addr->sadb_address_prefixlen =
3193                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3194                                     (struct sockaddr *) (addr + 1),
3195                                     x->props.family);
3196         if (!addr->sadb_address_prefixlen)
3197                 BUG();
3198
3199         /* dst address */
3200         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3201         addr->sadb_address_len =
3202                 (sizeof(struct sadb_address)+sockaddr_size)/
3203                         sizeof(uint64_t);
3204         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3205         addr->sadb_address_proto = 0;
3206         addr->sadb_address_reserved = 0;
3207         addr->sadb_address_prefixlen =
3208                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3209                                     (struct sockaddr *) (addr + 1),
3210                                     x->props.family);
3211         if (!addr->sadb_address_prefixlen)
3212                 BUG();
3213
3214         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3215         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3216         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3217         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3218         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3219         pol->sadb_x_policy_reserved = 0;
3220         pol->sadb_x_policy_id = xp->index;
3221         pol->sadb_x_policy_priority = xp->priority;
3222
3223         /* Set sadb_comb's. */
3224         if (x->id.proto == IPPROTO_AH)
3225                 dump_ah_combs(skb, t);
3226         else if (x->id.proto == IPPROTO_ESP)
3227                 dump_esp_combs(skb, t);
3228
3229         /* security context */
3230         if (xfrm_ctx) {
3231                 sec_ctx = skb_put(skb,
3232                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3233                 sec_ctx->sadb_x_sec_len =
3234                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3235                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3236                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3237                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3238                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3239                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3240                        xfrm_ctx->ctx_len);
3241         }
3242
3243         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3244                                xs_net(x));
3245 }
3246
3247 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3248                                                 u8 *data, int len, int *dir)
3249 {
3250         struct net *net = sock_net(sk);
3251         struct xfrm_policy *xp;
3252         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3253         struct sadb_x_sec_ctx *sec_ctx;
3254
3255         switch (sk->sk_family) {
3256         case AF_INET:
3257                 if (opt != IP_IPSEC_POLICY) {
3258                         *dir = -EOPNOTSUPP;
3259                         return NULL;
3260                 }
3261                 break;
3262 #if IS_ENABLED(CONFIG_IPV6)
3263         case AF_INET6:
3264                 if (opt != IPV6_IPSEC_POLICY) {
3265                         *dir = -EOPNOTSUPP;
3266                         return NULL;
3267                 }
3268                 break;
3269 #endif
3270         default:
3271                 *dir = -EINVAL;
3272                 return NULL;
3273         }
3274
3275         *dir = -EINVAL;
3276
3277         if (len < sizeof(struct sadb_x_policy) ||
3278             pol->sadb_x_policy_len*8 > len ||
3279             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3280             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3281                 return NULL;
3282
3283         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3284         if (xp == NULL) {
3285                 *dir = -ENOBUFS;
3286                 return NULL;
3287         }
3288
3289         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3290                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3291
3292         xp->lft.soft_byte_limit = XFRM_INF;
3293         xp->lft.hard_byte_limit = XFRM_INF;
3294         xp->lft.soft_packet_limit = XFRM_INF;
3295         xp->lft.hard_packet_limit = XFRM_INF;
3296         xp->family = sk->sk_family;
3297
3298         xp->xfrm_nr = 0;
3299         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3300             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3301                 goto out;
3302
3303         /* security context too */
3304         if (len >= (pol->sadb_x_policy_len*8 +
3305             sizeof(struct sadb_x_sec_ctx))) {
3306                 char *p = (char *)pol;
3307                 struct xfrm_user_sec_ctx *uctx;
3308
3309                 p += pol->sadb_x_policy_len*8;
3310                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3311                 if (len < pol->sadb_x_policy_len*8 +
3312                     sec_ctx->sadb_x_sec_len*8) {
3313                         *dir = -EINVAL;
3314                         goto out;
3315                 }
3316                 if ((*dir = verify_sec_ctx_len(p)))
3317                         goto out;
3318                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3319                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3320                 kfree(uctx);
3321
3322                 if (*dir)
3323                         goto out;
3324         }
3325
3326         *dir = pol->sadb_x_policy_dir-1;
3327         return xp;
3328
3329 out:
3330         xp->walk.dead = 1;
3331         xfrm_policy_destroy(xp);
3332         return NULL;
3333 }
3334
3335 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3336 {
3337         struct sk_buff *skb;
3338         struct sadb_msg *hdr;
3339         struct sadb_sa *sa;
3340         struct sadb_address *addr;
3341         struct sadb_x_nat_t_port *n_port;
3342         int sockaddr_size;
3343         int size;
3344         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3345         struct xfrm_encap_tmpl *natt = NULL;
3346
3347         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3348         if (!sockaddr_size)
3349                 return -EINVAL;
3350
3351         if (!satype)
3352                 return -EINVAL;
3353
3354         if (!x->encap)
3355                 return -EINVAL;
3356
3357         natt = x->encap;
3358
3359         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3360          *
3361          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3362          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3363          */
3364
3365         size = sizeof(struct sadb_msg) +
3366                 sizeof(struct sadb_sa) +
3367                 (sizeof(struct sadb_address) * 2) +
3368                 (sockaddr_size * 2) +
3369                 (sizeof(struct sadb_x_nat_t_port) * 2);
3370
3371         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3372         if (skb == NULL)
3373                 return -ENOMEM;
3374
3375         hdr = skb_put(skb, sizeof(struct sadb_msg));
3376         hdr->sadb_msg_version = PF_KEY_V2;
3377         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3378         hdr->sadb_msg_satype = satype;
3379         hdr->sadb_msg_len = size / sizeof(uint64_t);
3380         hdr->sadb_msg_errno = 0;
3381         hdr->sadb_msg_reserved = 0;
3382         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3383         hdr->sadb_msg_pid = 0;
3384
3385         /* SA */
3386         sa = skb_put(skb, sizeof(struct sadb_sa));
3387         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3388         sa->sadb_sa_exttype = SADB_EXT_SA;
3389         sa->sadb_sa_spi = x->id.spi;
3390         sa->sadb_sa_replay = 0;
3391         sa->sadb_sa_state = 0;
3392         sa->sadb_sa_auth = 0;
3393         sa->sadb_sa_encrypt = 0;
3394         sa->sadb_sa_flags = 0;
3395
3396         /* ADDRESS_SRC (old addr) */
3397         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3398         addr->sadb_address_len =
3399                 (sizeof(struct sadb_address)+sockaddr_size)/
3400                         sizeof(uint64_t);
3401         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3402         addr->sadb_address_proto = 0;
3403         addr->sadb_address_reserved = 0;
3404         addr->sadb_address_prefixlen =
3405                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3406                                     (struct sockaddr *) (addr + 1),
3407                                     x->props.family);
3408         if (!addr->sadb_address_prefixlen)
3409                 BUG();
3410
3411         /* NAT_T_SPORT (old port) */
3412         n_port = skb_put(skb, sizeof(*n_port));
3413         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3414         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3415         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3416         n_port->sadb_x_nat_t_port_reserved = 0;
3417
3418         /* ADDRESS_DST (new addr) */
3419         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3420         addr->sadb_address_len =
3421                 (sizeof(struct sadb_address)+sockaddr_size)/
3422                         sizeof(uint64_t);
3423         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3424         addr->sadb_address_proto = 0;
3425         addr->sadb_address_reserved = 0;
3426         addr->sadb_address_prefixlen =
3427                 pfkey_sockaddr_fill(ipaddr, 0,
3428                                     (struct sockaddr *) (addr + 1),
3429                                     x->props.family);
3430         if (!addr->sadb_address_prefixlen)
3431                 BUG();
3432
3433         /* NAT_T_DPORT (new port) */
3434         n_port = skb_put(skb, sizeof(*n_port));
3435         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3436         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3437         n_port->sadb_x_nat_t_port_port = sport;
3438         n_port->sadb_x_nat_t_port_reserved = 0;
3439
3440         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3441                                xs_net(x));
3442 }
3443
3444 #ifdef CONFIG_NET_KEY_MIGRATE
3445 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3446                             const struct xfrm_selector *sel)
3447 {
3448         struct sadb_address *addr;
3449         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3450         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3451         addr->sadb_address_exttype = type;
3452         addr->sadb_address_proto = sel->proto;
3453         addr->sadb_address_reserved = 0;
3454
3455         switch (type) {
3456         case SADB_EXT_ADDRESS_SRC:
3457                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3458                 pfkey_sockaddr_fill(&sel->saddr, 0,
3459                                     (struct sockaddr *)(addr + 1),
3460                                     sel->family);
3461                 break;
3462         case SADB_EXT_ADDRESS_DST:
3463                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3464                 pfkey_sockaddr_fill(&sel->daddr, 0,
3465                                     (struct sockaddr *)(addr + 1),
3466                                     sel->family);
3467                 break;
3468         default:
3469                 return -EINVAL;
3470         }
3471
3472         return 0;
3473 }
3474
3475
3476 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3477 {
3478         struct sadb_x_kmaddress *kma;
3479         u8 *sa;
3480         int family = k->family;
3481         int socklen = pfkey_sockaddr_len(family);
3482         int size_req;
3483
3484         size_req = (sizeof(struct sadb_x_kmaddress) +
3485                     pfkey_sockaddr_pair_size(family));
3486
3487         kma = skb_put_zero(skb, size_req);
3488         kma->sadb_x_kmaddress_len = size_req / 8;
3489         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3490         kma->sadb_x_kmaddress_reserved = k->reserved;
3491
3492         sa = (u8 *)(kma + 1);
3493         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3494             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3495                 return -EINVAL;
3496
3497         return 0;
3498 }
3499
3500 static int set_ipsecrequest(struct sk_buff *skb,
3501                             uint8_t proto, uint8_t mode, int level,
3502                             uint32_t reqid, uint8_t family,
3503                             const xfrm_address_t *src, const xfrm_address_t *dst)
3504 {
3505         struct sadb_x_ipsecrequest *rq;
3506         u8 *sa;
3507         int socklen = pfkey_sockaddr_len(family);
3508         int size_req;
3509
3510         size_req = sizeof(struct sadb_x_ipsecrequest) +
3511                    pfkey_sockaddr_pair_size(family);
3512
3513         rq = skb_put_zero(skb, size_req);
3514         rq->sadb_x_ipsecrequest_len = size_req;
3515         rq->sadb_x_ipsecrequest_proto = proto;
3516         rq->sadb_x_ipsecrequest_mode = mode;
3517         rq->sadb_x_ipsecrequest_level = level;
3518         rq->sadb_x_ipsecrequest_reqid = reqid;
3519
3520         sa = (u8 *) (rq + 1);
3521         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3522             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3523                 return -EINVAL;
3524
3525         return 0;
3526 }
3527 #endif
3528
3529 #ifdef CONFIG_NET_KEY_MIGRATE
3530 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3531                               const struct xfrm_migrate *m, int num_bundles,
3532                               const struct xfrm_kmaddress *k,
3533                               const struct xfrm_encap_tmpl *encap)
3534 {
3535         int i;
3536         int sasize_sel;
3537         int size = 0;
3538         int size_pol = 0;
3539         struct sk_buff *skb;
3540         struct sadb_msg *hdr;
3541         struct sadb_x_policy *pol;
3542         const struct xfrm_migrate *mp;
3543
3544         if (type != XFRM_POLICY_TYPE_MAIN)
3545                 return 0;
3546
3547         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3548                 return -EINVAL;
3549
3550         if (k != NULL) {
3551                 /* addresses for KM */
3552                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3553                                      pfkey_sockaddr_pair_size(k->family));
3554         }
3555
3556         /* selector */
3557         sasize_sel = pfkey_sockaddr_size(sel->family);
3558         if (!sasize_sel)
3559                 return -EINVAL;
3560         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3561
3562         /* policy info */
3563         size_pol += sizeof(struct sadb_x_policy);
3564
3565         /* ipsecrequests */
3566         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3567                 /* old locator pair */
3568                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3569                             pfkey_sockaddr_pair_size(mp->old_family);
3570                 /* new locator pair */
3571                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3572                             pfkey_sockaddr_pair_size(mp->new_family);
3573         }
3574
3575         size += sizeof(struct sadb_msg) + size_pol;
3576
3577         /* alloc buffer */
3578         skb = alloc_skb(size, GFP_ATOMIC);
3579         if (skb == NULL)
3580                 return -ENOMEM;
3581
3582         hdr = skb_put(skb, sizeof(struct sadb_msg));
3583         hdr->sadb_msg_version = PF_KEY_V2;
3584         hdr->sadb_msg_type = SADB_X_MIGRATE;
3585         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3586         hdr->sadb_msg_len = size / 8;
3587         hdr->sadb_msg_errno = 0;
3588         hdr->sadb_msg_reserved = 0;
3589         hdr->sadb_msg_seq = 0;
3590         hdr->sadb_msg_pid = 0;
3591
3592         /* Addresses to be used by KM for negotiation, if ext is available */
3593         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3594                 goto err;
3595
3596         /* selector src */
3597         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3598
3599         /* selector dst */
3600         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3601
3602         /* policy information */
3603         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3604         pol->sadb_x_policy_len = size_pol / 8;
3605         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3606         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3607         pol->sadb_x_policy_dir = dir + 1;
3608         pol->sadb_x_policy_reserved = 0;
3609         pol->sadb_x_policy_id = 0;
3610         pol->sadb_x_policy_priority = 0;
3611
3612         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3613                 /* old ipsecrequest */
3614                 int mode = pfkey_mode_from_xfrm(mp->mode);
3615                 if (mode < 0)
3616                         goto err;
3617                 if (set_ipsecrequest(skb, mp->proto, mode,
3618                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3619                                      mp->reqid, mp->old_family,
3620                                      &mp->old_saddr, &mp->old_daddr) < 0)
3621                         goto err;
3622
3623                 /* new ipsecrequest */
3624                 if (set_ipsecrequest(skb, mp->proto, mode,
3625                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3626                                      mp->reqid, mp->new_family,
3627                                      &mp->new_saddr, &mp->new_daddr) < 0)
3628                         goto err;
3629         }
3630
3631         /* broadcast migrate message to sockets */
3632         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3633
3634         return 0;
3635
3636 err:
3637         kfree_skb(skb);
3638         return -EINVAL;
3639 }
3640 #else
3641 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3642                               const struct xfrm_migrate *m, int num_bundles,
3643                               const struct xfrm_kmaddress *k,
3644                               const struct xfrm_encap_tmpl *encap)
3645 {
3646         return -ENOPROTOOPT;
3647 }
3648 #endif
3649
3650 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3651 {
3652         struct sock *sk = sock->sk;
3653         struct sk_buff *skb = NULL;
3654         struct sadb_msg *hdr = NULL;
3655         int err;
3656         struct net *net = sock_net(sk);
3657
3658         err = -EOPNOTSUPP;
3659         if (msg->msg_flags & MSG_OOB)
3660                 goto out;
3661
3662         err = -EMSGSIZE;
3663         if ((unsigned int)len > sk->sk_sndbuf - 32)
3664                 goto out;
3665
3666         err = -ENOBUFS;
3667         skb = alloc_skb(len, GFP_KERNEL);
3668         if (skb == NULL)
3669                 goto out;
3670
3671         err = -EFAULT;
3672         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3673                 goto out;
3674
3675         hdr = pfkey_get_base_msg(skb, &err);
3676         if (!hdr)
3677                 goto out;
3678
3679         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3680         err = pfkey_process(sk, skb, hdr);
3681         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3682
3683 out:
3684         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3685                 err = 0;
3686         kfree_skb(skb);
3687
3688         return err ? : len;
3689 }
3690
3691 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3692                          int flags)
3693 {
3694         struct sock *sk = sock->sk;
3695         struct pfkey_sock *pfk = pfkey_sk(sk);
3696         struct sk_buff *skb;
3697         int copied, err;
3698
3699         err = -EINVAL;
3700         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3701                 goto out;
3702
3703         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3704         if (skb == NULL)
3705                 goto out;
3706
3707         copied = skb->len;
3708         if (copied > len) {
3709                 msg->msg_flags |= MSG_TRUNC;
3710                 copied = len;
3711         }
3712
3713         skb_reset_transport_header(skb);
3714         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3715         if (err)
3716                 goto out_free;
3717
3718         sock_recv_ts_and_drops(msg, sk, skb);
3719
3720         err = (flags & MSG_TRUNC) ? skb->len : copied;
3721
3722         if (pfk->dump.dump != NULL &&
3723             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3724                 pfkey_do_dump(pfk);
3725
3726 out_free:
3727         skb_free_datagram(sk, skb);
3728 out:
3729         return err;
3730 }
3731
3732 static const struct proto_ops pfkey_ops = {
3733         .family         =       PF_KEY,
3734         .owner          =       THIS_MODULE,
3735         /* Operations that make no sense on pfkey sockets. */
3736         .bind           =       sock_no_bind,
3737         .connect        =       sock_no_connect,
3738         .socketpair     =       sock_no_socketpair,
3739         .accept         =       sock_no_accept,
3740         .getname        =       sock_no_getname,
3741         .ioctl          =       sock_no_ioctl,
3742         .listen         =       sock_no_listen,
3743         .shutdown       =       sock_no_shutdown,
3744         .mmap           =       sock_no_mmap,
3745         .sendpage       =       sock_no_sendpage,
3746
3747         /* Now the operations that really occur. */
3748         .release        =       pfkey_release,
3749         .poll           =       datagram_poll,
3750         .sendmsg        =       pfkey_sendmsg,
3751         .recvmsg        =       pfkey_recvmsg,
3752 };
3753
3754 static const struct net_proto_family pfkey_family_ops = {
3755         .family =       PF_KEY,
3756         .create =       pfkey_create,
3757         .owner  =       THIS_MODULE,
3758 };
3759
3760 #ifdef CONFIG_PROC_FS
3761 static int pfkey_seq_show(struct seq_file *f, void *v)
3762 {
3763         struct sock *s = sk_entry(v);
3764
3765         if (v == SEQ_START_TOKEN)
3766                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3767         else
3768                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3769                                s,
3770                                refcount_read(&s->sk_refcnt),
3771                                sk_rmem_alloc_get(s),
3772                                sk_wmem_alloc_get(s),
3773                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3774                                sock_i_ino(s)
3775                                );
3776         return 0;
3777 }
3778
3779 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3780         __acquires(rcu)
3781 {
3782         struct net *net = seq_file_net(f);
3783         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3784
3785         rcu_read_lock();
3786         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3787 }
3788
3789 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3790 {
3791         struct net *net = seq_file_net(f);
3792         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3793
3794         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3795 }
3796
3797 static void pfkey_seq_stop(struct seq_file *f, void *v)
3798         __releases(rcu)
3799 {
3800         rcu_read_unlock();
3801 }
3802
3803 static const struct seq_operations pfkey_seq_ops = {
3804         .start  = pfkey_seq_start,
3805         .next   = pfkey_seq_next,
3806         .stop   = pfkey_seq_stop,
3807         .show   = pfkey_seq_show,
3808 };
3809
3810 static int __net_init pfkey_init_proc(struct net *net)
3811 {
3812         struct proc_dir_entry *e;
3813
3814         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3815                         sizeof(struct seq_net_private));
3816         if (e == NULL)
3817                 return -ENOMEM;
3818
3819         return 0;
3820 }
3821
3822 static void __net_exit pfkey_exit_proc(struct net *net)
3823 {
3824         remove_proc_entry("pfkey", net->proc_net);
3825 }
3826 #else
3827 static inline int pfkey_init_proc(struct net *net)
3828 {
3829         return 0;
3830 }
3831
3832 static inline void pfkey_exit_proc(struct net *net)
3833 {
3834 }
3835 #endif
3836
3837 static struct xfrm_mgr pfkeyv2_mgr =
3838 {
3839         .notify         = pfkey_send_notify,
3840         .acquire        = pfkey_send_acquire,
3841         .compile_policy = pfkey_compile_policy,
3842         .new_mapping    = pfkey_send_new_mapping,
3843         .notify_policy  = pfkey_send_policy_notify,
3844         .migrate        = pfkey_send_migrate,
3845         .is_alive       = pfkey_is_alive,
3846 };
3847
3848 static int __net_init pfkey_net_init(struct net *net)
3849 {
3850         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3851         int rv;
3852
3853         INIT_HLIST_HEAD(&net_pfkey->table);
3854         atomic_set(&net_pfkey->socks_nr, 0);
3855
3856         rv = pfkey_init_proc(net);
3857
3858         return rv;
3859 }
3860
3861 static void __net_exit pfkey_net_exit(struct net *net)
3862 {
3863         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3864
3865         pfkey_exit_proc(net);
3866         WARN_ON(!hlist_empty(&net_pfkey->table));
3867 }
3868
3869 static struct pernet_operations pfkey_net_ops = {
3870         .init = pfkey_net_init,
3871         .exit = pfkey_net_exit,
3872         .id   = &pfkey_net_id,
3873         .size = sizeof(struct netns_pfkey),
3874 };
3875
3876 static void __exit ipsec_pfkey_exit(void)
3877 {
3878         xfrm_unregister_km(&pfkeyv2_mgr);
3879         sock_unregister(PF_KEY);
3880         unregister_pernet_subsys(&pfkey_net_ops);
3881         proto_unregister(&key_proto);
3882 }
3883
3884 static int __init ipsec_pfkey_init(void)
3885 {
3886         int err = proto_register(&key_proto, 0);
3887
3888         if (err != 0)
3889                 goto out;
3890
3891         err = register_pernet_subsys(&pfkey_net_ops);
3892         if (err != 0)
3893                 goto out_unregister_key_proto;
3894         err = sock_register(&pfkey_family_ops);
3895         if (err != 0)
3896                 goto out_unregister_pernet;
3897         err = xfrm_register_km(&pfkeyv2_mgr);
3898         if (err != 0)
3899                 goto out_sock_unregister;
3900 out:
3901         return err;
3902
3903 out_sock_unregister:
3904         sock_unregister(PF_KEY);
3905 out_unregister_pernet:
3906         unregister_pernet_subsys(&pfkey_net_ops);
3907 out_unregister_key_proto:
3908         proto_unregister(&key_proto);
3909         goto out;
3910 }
3911
3912 module_init(ipsec_pfkey_init);
3913 module_exit(ipsec_pfkey_exit);
3914 MODULE_LICENSE("GPL");
3915 MODULE_ALIAS_NETPROTO(PF_KEY);