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   <[email protected]>
   6  *              David S. Miller <[email protected]>
   7  *              Alexey Kuznetsov <[email protected]>
   8  *              Kunihiro Ishiguro <[email protected]>
   9  *              Kazunori MIYAZAWA / USAGI Project <[email protected]>
  10  *              Derek Atkins <[email protected]>
  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         if (!addr->sadb_address_prefixlen)
 932                 BUG();
 933
 934         /* dst address */
 935         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 936         addr->sadb_address_len =
 937                 (sizeof(struct sadb_address)+sockaddr_size)/
 938                         sizeof(uint64_t);
 939         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 940         addr->sadb_address_proto = 0;
 941         addr->sadb_address_reserved = 0;
 942
 943         addr->sadb_address_prefixlen =
 944                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 945                                     (struct sockaddr *) (addr + 1),
 946                                     x->props.family);
 947         if (!addr->sadb_address_prefixlen)
 948                 BUG();
 949
 950         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 951                              x->props.family)) {
 952                 addr = skb_put(skb,
 953                                sizeof(struct sadb_address) + sockaddr_size);
 954                 addr->sadb_address_len =
 955                         (sizeof(struct sadb_address)+sockaddr_size)/
 956                         sizeof(uint64_t);
 957                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 958                 addr->sadb_address_proto =
 959                         pfkey_proto_from_xfrm(x->sel.proto);
 960                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 961                 addr->sadb_address_reserved = 0;
 962
 963                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 964                                     (struct sockaddr *) (addr + 1),
 965                                     x->props.family);
 966         }
 967
 968         /* auth key */
 969         if (add_keys && auth_key_size) {
 970                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 971                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 972                         sizeof(uint64_t);
 973                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 974                 key->sadb_key_bits = x->aalg->alg_key_len;
 975                 key->sadb_key_reserved = 0;
 976                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 977         }
 978         /* encrypt key */
 979         if (add_keys && encrypt_key_size) {
 980                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 981                 key->sadb_key_len = (sizeof(struct sadb_key) +
 982                                      encrypt_key_size) / sizeof(uint64_t);
 983                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 984                 key->sadb_key_bits = x->ealg->alg_key_len;
 985                 key->sadb_key_reserved = 0;
 986                 memcpy(key + 1, x->ealg->alg_key,
 987                        (x->ealg->alg_key_len+7)/8);
 988         }
 989
 990         /* sa */
 991         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 992         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 993         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 994         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 995                 kfree_skb(skb);
 996                 return ERR_PTR(-EINVAL);
 997         }
 998         sa2->sadb_x_sa2_mode = mode;
 999         sa2->sadb_x_sa2_reserved1 = 0;
1000         sa2->sadb_x_sa2_reserved2 = 0;
1001         sa2->sadb_x_sa2_sequence = 0;
1002         sa2->sadb_x_sa2_reqid = x->props.reqid;
1003
1004         if (natt && natt->encap_type) {
1005                 struct sadb_x_nat_t_type *n_type;
1006                 struct sadb_x_nat_t_port *n_port;
1007
1008                 /* type */
1009                 n_type = skb_put(skb, sizeof(*n_type));
1010                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1011                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1012                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1013                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1014                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1015                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1016
1017                 /* source port */
1018                 n_port = skb_put(skb, sizeof(*n_port));
1019                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1020                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1021                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1022                 n_port->sadb_x_nat_t_port_reserved = 0;
1023
1024                 /* dest port */
1025                 n_port = skb_put(skb, sizeof(*n_port));
1026                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1027                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1028                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1029                 n_port->sadb_x_nat_t_port_reserved = 0;
1030         }
1031
1032         /* security context */
1033         if (xfrm_ctx) {
1034                 sec_ctx = skb_put(skb,
1035                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1036                 sec_ctx->sadb_x_sec_len =
1037                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1038                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1039                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1040                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1041                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1042                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1043                        xfrm_ctx->ctx_len);
1044         }
1045
1046         return skb;
1047 }
1048
1049
1050 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1051 {
1052         struct sk_buff *skb;
1053
1054         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1055
1056         return skb;
1057 }
1058
1059 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1060                                                           int hsc)
1061 {
1062         return __pfkey_xfrm_state2msg(x, 0, hsc);
1063 }
1064
1065 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1066                                                 const struct sadb_msg *hdr,
1067                                                 void * const *ext_hdrs)
1068 {
1069         struct xfrm_state *x;
1070         const struct sadb_lifetime *lifetime;
1071         const struct sadb_sa *sa;
1072         const struct sadb_key *key;
1073         const struct sadb_x_sec_ctx *sec_ctx;
1074         uint16_t proto;
1075         int err;
1076
1077
1078         sa = ext_hdrs[SADB_EXT_SA - 1];
1079         if (!sa ||
1080             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1081                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1082                 return ERR_PTR(-EINVAL);
1083         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1084             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1085                 return ERR_PTR(-EINVAL);
1086         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1087             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1088                 return ERR_PTR(-EINVAL);
1089         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1090             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1091                 return ERR_PTR(-EINVAL);
1092
1093         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1094         if (proto == 0)
1095                 return ERR_PTR(-EINVAL);
1096
1097         /* default error is no buffer space */
1098         err = -ENOBUFS;
1099
1100         /* RFC2367:
1101
1102    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1103    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1104    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1105    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1106    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1107    not true.
1108
1109            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1110            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1111          */
1112         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1113             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1114              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1115             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1116                 return ERR_PTR(-EINVAL);
1117         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1118         if (key != NULL &&
1119             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1120             key->sadb_key_bits == 0)
1121                 return ERR_PTR(-EINVAL);
1122         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1123         if (key != NULL &&
1124             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1125             key->sadb_key_bits == 0)
1126                 return ERR_PTR(-EINVAL);
1127
1128         x = xfrm_state_alloc(net);
1129         if (x == NULL)
1130                 return ERR_PTR(-ENOBUFS);
1131
1132         x->id.proto = proto;
1133         x->id.spi = sa->sadb_sa_spi;
1134         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1135                                         (sizeof(x->replay.bitmap) * 8));
1136         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1137                 x->props.flags |= XFRM_STATE_NOECN;
1138         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1139                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1140         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1141                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1142
1143         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1144         if (lifetime != NULL) {
1145                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1146                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1147                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1148                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1149         }
1150         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1151         if (lifetime != NULL) {
1152                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1153                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1154                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1155                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1156         }
1157
1158         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1159         if (sec_ctx != NULL) {
1160                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1161
1162                 if (!uctx)
1163                         goto out;
1164
1165                 err = security_xfrm_state_alloc(x, uctx);
1166                 kfree(uctx);
1167
1168                 if (err)
1169                         goto out;
1170         }
1171
1172         err = -ENOBUFS;
1173         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1174         if (sa->sadb_sa_auth) {
1175                 int keysize = 0;
1176                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1177                 if (!a || !a->pfkey_supported) {
1178                         err = -ENOSYS;
1179                         goto out;
1180                 }
1181                 if (key)
1182                         keysize = (key->sadb_key_bits + 7) / 8;
1183                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1184                 if (!x->aalg) {
1185                         err = -ENOMEM;
1186                         goto out;
1187                 }
1188                 strcpy(x->aalg->alg_name, a->name);
1189                 x->aalg->alg_key_len = 0;
1190                 if (key) {
1191                         x->aalg->alg_key_len = key->sadb_key_bits;
1192                         memcpy(x->aalg->alg_key, key+1, keysize);
1193                 }
1194                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1195                 x->props.aalgo = sa->sadb_sa_auth;
1196                 /* x->algo.flags = sa->sadb_sa_flags; */
1197         }
1198         if (sa->sadb_sa_encrypt) {
1199                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1200                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1201                         if (!a || !a->pfkey_supported) {
1202                                 err = -ENOSYS;
1203                                 goto out;
1204                         }
1205                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1206                         if (!x->calg) {
1207                                 err = -ENOMEM;
1208                                 goto out;
1209                         }
1210                         strcpy(x->calg->alg_name, a->name);
1211                         x->props.calgo = sa->sadb_sa_encrypt;
1212                 } else {
1213                         int keysize = 0;
1214                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1215                         if (!a || !a->pfkey_supported) {
1216                                 err = -ENOSYS;
1217                                 goto out;
1218                         }
1219                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1220                         if (key)
1221                                 keysize = (key->sadb_key_bits + 7) / 8;
1222                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1223                         if (!x->ealg) {
1224                                 err = -ENOMEM;
1225                                 goto out;
1226                         }
1227                         strcpy(x->ealg->alg_name, a->name);
1228                         x->ealg->alg_key_len = 0;
1229                         if (key) {
1230                                 x->ealg->alg_key_len = key->sadb_key_bits;
1231                                 memcpy(x->ealg->alg_key, key+1, keysize);
1232                         }
1233                         x->props.ealgo = sa->sadb_sa_encrypt;
1234                         x->geniv = a->uinfo.encr.geniv;
1235                 }
1236         }
1237         /* x->algo.flags = sa->sadb_sa_flags; */
1238
1239         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1240                                                     &x->props.saddr);
1241         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1242                                   &x->id.daddr);
1243
1244         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1245                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1246                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1247                 if (mode < 0) {
1248                         err = -EINVAL;
1249                         goto out;
1250                 }
1251                 x->props.mode = mode;
1252                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1253         }
1254
1255         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1256                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1257
1258                 /* Nobody uses this, but we try. */
1259                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1260                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1261         }
1262
1263         if (!x->sel.family)
1264                 x->sel.family = x->props.family;
1265
1266         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1267                 const struct sadb_x_nat_t_type* n_type;
1268                 struct xfrm_encap_tmpl *natt;
1269
1270                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1271                 if (!x->encap) {
1272                         err = -ENOMEM;
1273                         goto out;
1274                 }
1275
1276                 natt = x->encap;
1277                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1278                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1279
1280                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1281                         const struct sadb_x_nat_t_port *n_port =
1282                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1283                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1284                 }
1285                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1286                         const struct sadb_x_nat_t_port *n_port =
1287                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1288                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1289                 }
1290                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1291         }
1292
1293         err = xfrm_init_state(x);
1294         if (err)
1295                 goto out;
1296
1297         x->km.seq = hdr->sadb_msg_seq;
1298         return x;
1299
1300 out:
1301         x->km.state = XFRM_STATE_DEAD;
1302         xfrm_state_put(x);
1303         return ERR_PTR(err);
1304 }
1305
1306 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1307 {
1308         return -EOPNOTSUPP;
1309 }
1310
1311 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1312 {
1313         struct net *net = sock_net(sk);
1314         struct sk_buff *resp_skb;
1315         struct sadb_x_sa2 *sa2;
1316         struct sadb_address *saddr, *daddr;
1317         struct sadb_msg *out_hdr;
1318         struct sadb_spirange *range;
1319         struct xfrm_state *x = NULL;
1320         int mode;
1321         int err;
1322         u32 min_spi, max_spi;
1323         u32 reqid;
1324         u8 proto;
1325         unsigned short family;
1326         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1327
1328         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1329                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1330                 return -EINVAL;
1331
1332         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1333         if (proto == 0)
1334                 return -EINVAL;
1335
1336         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1337                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1338                 if (mode < 0)
1339                         return -EINVAL;
1340                 reqid = sa2->sadb_x_sa2_reqid;
1341         } else {
1342                 mode = 0;
1343                 reqid = 0;
1344         }
1345
1346         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1347         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1348
1349         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1350         switch (family) {
1351         case AF_INET:
1352                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1353                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1354                 break;
1355 #if IS_ENABLED(CONFIG_IPV6)
1356         case AF_INET6:
1357                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1358                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1359                 break;
1360 #endif
1361         }
1362
1363         if (hdr->sadb_msg_seq) {
1364                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1365                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1366                         xfrm_state_put(x);
1367                         x = NULL;
1368                 }
1369         }
1370
1371         if (!x)
1372                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1373
1374         if (x == NULL)
1375                 return -ENOENT;
1376
1377         min_spi = 0x100;
1378         max_spi = 0x0fffffff;
1379
1380         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1381         if (range) {
1382                 min_spi = range->sadb_spirange_min;
1383                 max_spi = range->sadb_spirange_max;
1384         }
1385
1386         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1387         if (err) {
1388                 xfrm_state_put(x);
1389                 return err;
1390         }
1391
1392         err = xfrm_alloc_spi(x, min_spi, max_spi);
1393         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1394
1395         if (IS_ERR(resp_skb)) {
1396                 xfrm_state_put(x);
1397                 return  PTR_ERR(resp_skb);
1398         }
1399
1400         out_hdr = (struct sadb_msg *) resp_skb->data;
1401         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1402         out_hdr->sadb_msg_type = SADB_GETSPI;
1403         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1404         out_hdr->sadb_msg_errno = 0;
1405         out_hdr->sadb_msg_reserved = 0;
1406         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1407         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1408
1409         xfrm_state_put(x);
1410
1411         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1412
1413         return 0;
1414 }
1415
1416 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1417 {
1418         struct net *net = sock_net(sk);
1419         struct xfrm_state *x;
1420
1421         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1422                 return -EOPNOTSUPP;
1423
1424         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1425                 return 0;
1426
1427         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1428         if (x == NULL)
1429                 return 0;
1430
1431         spin_lock_bh(&x->lock);
1432         if (x->km.state == XFRM_STATE_ACQ)
1433                 x->km.state = XFRM_STATE_ERROR;
1434
1435         spin_unlock_bh(&x->lock);
1436         xfrm_state_put(x);
1437         return 0;
1438 }
1439
1440 static inline int event2poltype(int event)
1441 {
1442         switch (event) {
1443         case XFRM_MSG_DELPOLICY:
1444                 return SADB_X_SPDDELETE;
1445         case XFRM_MSG_NEWPOLICY:
1446                 return SADB_X_SPDADD;
1447         case XFRM_MSG_UPDPOLICY:
1448                 return SADB_X_SPDUPDATE;
1449         case XFRM_MSG_POLEXPIRE:
1450         //      return SADB_X_SPDEXPIRE;
1451         default:
1452                 pr_err("pfkey: Unknown policy event %d\n", event);
1453                 break;
1454         }
1455
1456         return 0;
1457 }
1458
1459 static inline int event2keytype(int event)
1460 {
1461         switch (event) {
1462         case XFRM_MSG_DELSA:
1463                 return SADB_DELETE;
1464         case XFRM_MSG_NEWSA:
1465                 return SADB_ADD;
1466         case XFRM_MSG_UPDSA:
1467                 return SADB_UPDATE;
1468         case XFRM_MSG_EXPIRE:
1469                 return SADB_EXPIRE;
1470         default:
1471                 pr_err("pfkey: Unknown SA event %d\n", event);
1472                 break;
1473         }
1474
1475         return 0;
1476 }
1477
1478 /* ADD/UPD/DEL */
1479 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1480 {
1481         struct sk_buff *skb;
1482         struct sadb_msg *hdr;
1483
1484         skb = pfkey_xfrm_state2msg(x);
1485
1486         if (IS_ERR(skb))
1487                 return PTR_ERR(skb);
1488
1489         hdr = (struct sadb_msg *) skb->data;
1490         hdr->sadb_msg_version = PF_KEY_V2;
1491         hdr->sadb_msg_type = event2keytype(c->event);
1492         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1493         hdr->sadb_msg_errno = 0;
1494         hdr->sadb_msg_reserved = 0;
1495         hdr->sadb_msg_seq = c->seq;
1496         hdr->sadb_msg_pid = c->portid;
1497
1498         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1499
1500         return 0;
1501 }
1502
1503 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1504 {
1505         struct net *net = sock_net(sk);
1506         struct xfrm_state *x;
1507         int err;
1508         struct km_event c;
1509
1510         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1511         if (IS_ERR(x))
1512                 return PTR_ERR(x);
1513
1514         xfrm_state_hold(x);
1515         if (hdr->sadb_msg_type == SADB_ADD)
1516                 err = xfrm_state_add(x);
1517         else
1518                 err = xfrm_state_update(x);
1519
1520         xfrm_audit_state_add(x, err ? 0 : 1, true);
1521
1522         if (err < 0) {
1523                 x->km.state = XFRM_STATE_DEAD;
1524                 __xfrm_state_put(x);
1525                 goto out;
1526         }
1527
1528         if (hdr->sadb_msg_type == SADB_ADD)
1529                 c.event = XFRM_MSG_NEWSA;
1530         else
1531                 c.event = XFRM_MSG_UPDSA;
1532         c.seq = hdr->sadb_msg_seq;
1533         c.portid = hdr->sadb_msg_pid;
1534         km_state_notify(x, &c);
1535 out:
1536         xfrm_state_put(x);
1537         return err;
1538 }
1539
1540 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1541 {
1542         struct net *net = sock_net(sk);
1543         struct xfrm_state *x;
1544         struct km_event c;
1545         int err;
1546
1547         if (!ext_hdrs[SADB_EXT_SA-1] ||
1548             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550                 return -EINVAL;
1551
1552         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553         if (x == NULL)
1554                 return -ESRCH;
1555
1556         if ((err = security_xfrm_state_delete(x)))
1557                 goto out;
1558
1559         if (xfrm_state_kern(x)) {
1560                 err = -EPERM;
1561                 goto out;
1562         }
1563
1564         err = xfrm_state_delete(x);
1565
1566         if (err < 0)
1567                 goto out;
1568
1569         c.seq = hdr->sadb_msg_seq;
1570         c.portid = hdr->sadb_msg_pid;
1571         c.event = XFRM_MSG_DELSA;
1572         km_state_notify(x, &c);
1573 out:
1574         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1575         xfrm_state_put(x);
1576
1577         return err;
1578 }
1579
1580 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1581 {
1582         struct net *net = sock_net(sk);
1583         __u8 proto;
1584         struct sk_buff *out_skb;
1585         struct sadb_msg *out_hdr;
1586         struct xfrm_state *x;
1587
1588         if (!ext_hdrs[SADB_EXT_SA-1] ||
1589             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1590                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1591                 return -EINVAL;
1592
1593         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1594         if (x == NULL)
1595                 return -ESRCH;
1596
1597         out_skb = pfkey_xfrm_state2msg(x);
1598         proto = x->id.proto;
1599         xfrm_state_put(x);
1600         if (IS_ERR(out_skb))
1601                 return  PTR_ERR(out_skb);
1602
1603         out_hdr = (struct sadb_msg *) out_skb->data;
1604         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1605         out_hdr->sadb_msg_type = SADB_GET;
1606         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1607         out_hdr->sadb_msg_errno = 0;
1608         out_hdr->sadb_msg_reserved = 0;
1609         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1610         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1611         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1612
1613         return 0;
1614 }
1615
1616 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1617                                               gfp_t allocation)
1618 {
1619         struct sk_buff *skb;
1620         struct sadb_msg *hdr;
1621         int len, auth_len, enc_len, i;
1622
1623         auth_len = xfrm_count_pfkey_auth_supported();
1624         if (auth_len) {
1625                 auth_len *= sizeof(struct sadb_alg);
1626                 auth_len += sizeof(struct sadb_supported);
1627         }
1628
1629         enc_len = xfrm_count_pfkey_enc_supported();
1630         if (enc_len) {
1631                 enc_len *= sizeof(struct sadb_alg);
1632                 enc_len += sizeof(struct sadb_supported);
1633         }
1634
1635         len = enc_len + auth_len + sizeof(struct sadb_msg);
1636
1637         skb = alloc_skb(len + 16, allocation);
1638         if (!skb)
1639                 goto out_put_algs;
1640
1641         hdr = skb_put(skb, sizeof(*hdr));
1642         pfkey_hdr_dup(hdr, orig);
1643         hdr->sadb_msg_errno = 0;
1644         hdr->sadb_msg_len = len / sizeof(uint64_t);
1645
1646         if (auth_len) {
1647                 struct sadb_supported *sp;
1648                 struct sadb_alg *ap;
1649
1650                 sp = skb_put(skb, auth_len);
1651                 ap = (struct sadb_alg *) (sp + 1);
1652
1653                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1654                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1655
1656                 for (i = 0; ; i++) {
1657                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1658                         if (!aalg)
1659                                 break;
1660                         if (!aalg->pfkey_supported)
1661                                 continue;
1662                         if (aalg->available)
1663                                 *ap++ = aalg->desc;
1664                 }
1665         }
1666
1667         if (enc_len) {
1668                 struct sadb_supported *sp;
1669                 struct sadb_alg *ap;
1670
1671                 sp = skb_put(skb, enc_len);
1672                 ap = (struct sadb_alg *) (sp + 1);
1673
1674                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1675                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1676
1677                 for (i = 0; ; i++) {
1678                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1679                         if (!ealg)
1680                                 break;
1681                         if (!ealg->pfkey_supported)
1682                                 continue;
1683                         if (ealg->available)
1684                                 *ap++ = ealg->desc;
1685                 }
1686         }
1687
1688 out_put_algs:
1689         return skb;
1690 }
1691
1692 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1693 {
1694         struct pfkey_sock *pfk = pfkey_sk(sk);
1695         struct sk_buff *supp_skb;
1696
1697         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1698                 return -EINVAL;
1699
1700         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1701                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1702                         return -EEXIST;
1703                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1704         }
1705
1706         xfrm_probe_algs();
1707
1708         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1709         if (!supp_skb) {
1710                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1711                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1712
1713                 return -ENOBUFS;
1714         }
1715
1716         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1717                         sock_net(sk));
1718         return 0;
1719 }
1720
1721 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1722 {
1723         struct sk_buff *skb;
1724         struct sadb_msg *hdr;
1725
1726         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1727         if (!skb)
1728                 return -ENOBUFS;
1729
1730         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1731         hdr->sadb_msg_errno = (uint8_t) 0;
1732         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1733
1734         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1735                                sock_net(sk));
1736 }
1737
1738 static int key_notify_sa_flush(const struct km_event *c)
1739 {
1740         struct sk_buff *skb;
1741         struct sadb_msg *hdr;
1742
1743         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1744         if (!skb)
1745                 return -ENOBUFS;
1746         hdr = skb_put(skb, sizeof(struct sadb_msg));
1747         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1748         hdr->sadb_msg_type = SADB_FLUSH;
1749         hdr->sadb_msg_seq = c->seq;
1750         hdr->sadb_msg_pid = c->portid;
1751         hdr->sadb_msg_version = PF_KEY_V2;
1752         hdr->sadb_msg_errno = (uint8_t) 0;
1753         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1754         hdr->sadb_msg_reserved = 0;
1755
1756         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1757
1758         return 0;
1759 }
1760
1761 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1762 {
1763         struct net *net = sock_net(sk);
1764         unsigned int proto;
1765         struct km_event c;
1766         int err, err2;
1767
1768         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1769         if (proto == 0)
1770                 return -EINVAL;
1771
1772         err = xfrm_state_flush(net, proto, true, false);
1773         err2 = unicast_flush_resp(sk, hdr);
1774         if (err || err2) {
1775                 if (err == -ESRCH) /* empty table - go quietly */
1776                         err = 0;
1777                 return err ? err : err2;
1778         }
1779
1780         c.data.proto = proto;
1781         c.seq = hdr->sadb_msg_seq;
1782         c.portid = hdr->sadb_msg_pid;
1783         c.event = XFRM_MSG_FLUSHSA;
1784         c.net = net;
1785         km_state_notify(NULL, &c);
1786
1787         return 0;
1788 }
1789
1790 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1791 {
1792         struct pfkey_sock *pfk = ptr;
1793         struct sk_buff *out_skb;
1794         struct sadb_msg *out_hdr;
1795
1796         if (!pfkey_can_dump(&pfk->sk))
1797                 return -ENOBUFS;
1798
1799         out_skb = pfkey_xfrm_state2msg(x);
1800         if (IS_ERR(out_skb))
1801                 return PTR_ERR(out_skb);
1802
1803         out_hdr = (struct sadb_msg *) out_skb->data;
1804         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1805         out_hdr->sadb_msg_type = SADB_DUMP;
1806         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1807         out_hdr->sadb_msg_errno = 0;
1808         out_hdr->sadb_msg_reserved = 0;
1809         out_hdr->sadb_msg_seq = count + 1;
1810         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1811
1812         if (pfk->dump.skb)
1813                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1814                                 &pfk->sk, sock_net(&pfk->sk));
1815         pfk->dump.skb = out_skb;
1816
1817         return 0;
1818 }
1819
1820 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1821 {
1822         struct net *net = sock_net(&pfk->sk);
1823         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1824 }
1825
1826 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1827 {
1828         struct net *net = sock_net(&pfk->sk);
1829
1830         xfrm_state_walk_done(&pfk->dump.u.state, net);
1831 }
1832
1833 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1834 {
1835         u8 proto;
1836         struct xfrm_address_filter *filter = NULL;
1837         struct pfkey_sock *pfk = pfkey_sk(sk);
1838
1839         mutex_lock(&pfk->dump_lock);
1840         if (pfk->dump.dump != NULL) {
1841                 mutex_unlock(&pfk->dump_lock);
1842                 return -EBUSY;
1843         }
1844
1845         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1846         if (proto == 0) {
1847                 mutex_unlock(&pfk->dump_lock);
1848                 return -EINVAL;
1849         }
1850
1851         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1852                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1853
1854                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1855                 if (filter == NULL) {
1856                         mutex_unlock(&pfk->dump_lock);
1857                         return -ENOMEM;
1858                 }
1859
1860                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1861                        sizeof(xfrm_address_t));
1862                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1863                        sizeof(xfrm_address_t));
1864                 filter->family = xfilter->sadb_x_filter_family;
1865                 filter->splen = xfilter->sadb_x_filter_splen;
1866                 filter->dplen = xfilter->sadb_x_filter_dplen;
1867         }
1868
1869         pfk->dump.msg_version = hdr->sadb_msg_version;
1870         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1871         pfk->dump.dump = pfkey_dump_sa;
1872         pfk->dump.done = pfkey_dump_sa_done;
1873         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1874         mutex_unlock(&pfk->dump_lock);
1875
1876         return pfkey_do_dump(pfk);
1877 }
1878
1879 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1880 {
1881         struct pfkey_sock *pfk = pfkey_sk(sk);
1882         int satype = hdr->sadb_msg_satype;
1883         bool reset_errno = false;
1884
1885         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1886                 reset_errno = true;
1887                 if (satype != 0 && satype != 1)
1888                         return -EINVAL;
1889                 pfk->promisc = satype;
1890         }
1891         if (reset_errno && skb_cloned(skb))
1892                 skb = skb_copy(skb, GFP_KERNEL);
1893         else
1894                 skb = skb_clone(skb, GFP_KERNEL);
1895
1896         if (reset_errno && skb) {
1897                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1898                 new_hdr->sadb_msg_errno = 0;
1899         }
1900
1901         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1902         return 0;
1903 }
1904
1905 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1906 {
1907         int i;
1908         u32 reqid = *(u32*)ptr;
1909
1910         for (i=0; i<xp->xfrm_nr; i++) {
1911                 if (xp->xfrm_vec[i].reqid == reqid)
1912                         return -EEXIST;
1913         }
1914         return 0;
1915 }
1916
1917 static u32 gen_reqid(struct net *net)
1918 {
1919         struct xfrm_policy_walk walk;
1920         u32 start;
1921         int rc;
1922         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1923
1924         start = reqid;
1925         do {
1926                 ++reqid;
1927                 if (reqid == 0)
1928                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1929                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1930                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1931                 xfrm_policy_walk_done(&walk, net);
1932                 if (rc != -EEXIST)
1933                         return reqid;
1934         } while (reqid != start);
1935         return 0;
1936 }
1937
1938 static int
1939 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1940 {
1941         struct net *net = xp_net(xp);
1942         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1943         int mode;
1944
1945         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1946                 return -ELOOP;
1947
1948         if (rq->sadb_x_ipsecrequest_mode == 0)
1949                 return -EINVAL;
1950         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1951                 return -EINVAL;
1952
1953         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1954         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1955                 return -EINVAL;
1956         t->mode = mode;
1957         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1958                 t->optional = 1;
1959         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1960                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1961                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1962                         t->reqid = 0;
1963                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1964                         return -ENOBUFS;
1965         }
1966
1967         /* addresses present only in tunnel mode */
1968         if (t->mode == XFRM_MODE_TUNNEL) {
1969                 int err;
1970
1971                 err = parse_sockaddr_pair(
1972                         (struct sockaddr *)(rq + 1),
1973                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1974                         &t->saddr, &t->id.daddr, &t->encap_family);
1975                 if (err)
1976                         return err;
1977         } else
1978                 t->encap_family = xp->family;
1979
1980         /* No way to set this via kame pfkey */
1981         t->allalgs = 1;
1982         xp->xfrm_nr++;
1983         return 0;
1984 }
1985
1986 static int
1987 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1988 {
1989         int err;
1990         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1991         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1992
1993         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1994                 return -EINVAL;
1995
1996         while (len >= sizeof(*rq)) {
1997                 if (len < rq->sadb_x_ipsecrequest_len ||
1998                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1999                         return -EINVAL;
2000
2001                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2002                         return err;
2003                 len -= rq->sadb_x_ipsecrequest_len;
2004                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2005         }
2006         return 0;
2007 }
2008
2009 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2010 {
2011         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2012
2013         if (xfrm_ctx) {
2014                 int len = sizeof(struct sadb_x_sec_ctx);
2015                 len += xfrm_ctx->ctx_len;
2016                 return PFKEY_ALIGN8(len);
2017         }
2018         return 0;
2019 }
2020
2021 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2022 {
2023         const struct xfrm_tmpl *t;
2024         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2025         int socklen = 0;
2026         int i;
2027
2028         for (i=0; i<xp->xfrm_nr; i++) {
2029                 t = xp->xfrm_vec + i;
2030                 socklen += pfkey_sockaddr_len(t->encap_family);
2031         }
2032
2033         return sizeof(struct sadb_msg) +
2034                 (sizeof(struct sadb_lifetime) * 3) +
2035                 (sizeof(struct sadb_address) * 2) +
2036                 (sockaddr_size * 2) +
2037                 sizeof(struct sadb_x_policy) +
2038                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2039                 (socklen * 2) +
2040                 pfkey_xfrm_policy2sec_ctx_size(xp);
2041 }
2042
2043 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2044 {
2045         struct sk_buff *skb;
2046         int size;
2047
2048         size = pfkey_xfrm_policy2msg_size(xp);
2049
2050         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2051         if (skb == NULL)
2052                 return ERR_PTR(-ENOBUFS);
2053
2054         return skb;
2055 }
2056
2057 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2058 {
2059         struct sadb_msg *hdr;
2060         struct sadb_address *addr;
2061         struct sadb_lifetime *lifetime;
2062         struct sadb_x_policy *pol;
2063         struct sadb_x_sec_ctx *sec_ctx;
2064         struct xfrm_sec_ctx *xfrm_ctx;
2065         int i;
2066         int size;
2067         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2068         int socklen = pfkey_sockaddr_len(xp->family);
2069
2070         size = pfkey_xfrm_policy2msg_size(xp);
2071
2072         /* call should fill header later */
2073         hdr = skb_put(skb, sizeof(struct sadb_msg));
2074         memset(hdr, 0, size);   /* XXX do we need this ? */
2075
2076         /* src address */
2077         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2078         addr->sadb_address_len =
2079                 (sizeof(struct sadb_address)+sockaddr_size)/
2080                         sizeof(uint64_t);
2081         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2082         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2083         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2084         addr->sadb_address_reserved = 0;
2085         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2086                                  xp->selector.sport,
2087                                  (struct sockaddr *) (addr + 1),
2088                                  xp->family))
2089                 BUG();
2090
2091         /* dst address */
2092         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2093         addr->sadb_address_len =
2094                 (sizeof(struct sadb_address)+sockaddr_size)/
2095                         sizeof(uint64_t);
2096         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2097         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2098         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2099         addr->sadb_address_reserved = 0;
2100
2101         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2102                             (struct sockaddr *) (addr + 1),
2103                             xp->family);
2104
2105         /* hard time */
2106         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2107         lifetime->sadb_lifetime_len =
2108                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2109         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2110         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2111         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2112         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2113         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2114         /* soft time */
2115         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2116         lifetime->sadb_lifetime_len =
2117                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2118         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2119         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2120         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2121         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2122         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2123         /* current time */
2124         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2125         lifetime->sadb_lifetime_len =
2126                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2127         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2128         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2129         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2130         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2131         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2132
2133         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2134         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2135         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2136         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2137         if (xp->action == XFRM_POLICY_ALLOW) {
2138                 if (xp->xfrm_nr)
2139                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2140                 else
2141                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2142         }
2143         pol->sadb_x_policy_dir = dir+1;
2144         pol->sadb_x_policy_reserved = 0;
2145         pol->sadb_x_policy_id = xp->index;
2146         pol->sadb_x_policy_priority = xp->priority;
2147
2148         for (i=0; i<xp->xfrm_nr; i++) {
2149                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2150                 struct sadb_x_ipsecrequest *rq;
2151                 int req_size;
2152                 int mode;
2153
2154                 req_size = sizeof(struct sadb_x_ipsecrequest);
2155                 if (t->mode == XFRM_MODE_TUNNEL) {
2156                         socklen = pfkey_sockaddr_len(t->encap_family);
2157                         req_size += socklen * 2;
2158                 } else {
2159                         size -= 2*socklen;
2160                 }
2161                 rq = skb_put(skb, req_size);
2162                 pol->sadb_x_policy_len += req_size/8;
2163                 memset(rq, 0, sizeof(*rq));
2164                 rq->sadb_x_ipsecrequest_len = req_size;
2165                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2166                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2167                         return -EINVAL;
2168                 rq->sadb_x_ipsecrequest_mode = mode;
2169                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2170                 if (t->reqid)
2171                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2172                 if (t->optional)
2173                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2174                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2175
2176                 if (t->mode == XFRM_MODE_TUNNEL) {
2177                         u8 *sa = (void *)(rq + 1);
2178                         pfkey_sockaddr_fill(&t->saddr, 0,
2179                                             (struct sockaddr *)sa,
2180                                             t->encap_family);
2181                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2182                                             (struct sockaddr *) (sa + socklen),
2183                                             t->encap_family);
2184                 }
2185         }
2186
2187         /* security context */
2188         if ((xfrm_ctx = xp->security)) {
2189                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2190
2191                 sec_ctx = skb_put(skb, ctx_size);
2192                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2193                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2194                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2195                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2196                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2197                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2198                        xfrm_ctx->ctx_len);
2199         }
2200
2201         hdr->sadb_msg_len = size / sizeof(uint64_t);
2202         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2203
2204         return 0;
2205 }
2206
2207 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2208 {
2209         struct sk_buff *out_skb;
2210         struct sadb_msg *out_hdr;
2211         int err;
2212
2213         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2214         if (IS_ERR(out_skb))
2215                 return PTR_ERR(out_skb);
2216
2217         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2218         if (err < 0) {
2219                 kfree_skb(out_skb);
2220                 return err;
2221         }
2222
2223         out_hdr = (struct sadb_msg *) out_skb->data;
2224         out_hdr->sadb_msg_version = PF_KEY_V2;
2225
2226         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2227                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2228         else
2229                 out_hdr->sadb_msg_type = event2poltype(c->event);
2230         out_hdr->sadb_msg_errno = 0;
2231         out_hdr->sadb_msg_seq = c->seq;
2232         out_hdr->sadb_msg_pid = c->portid;
2233         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2234         return 0;
2235
2236 }
2237
2238 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2239 {
2240         struct net *net = sock_net(sk);
2241         int err = 0;
2242         struct sadb_lifetime *lifetime;
2243         struct sadb_address *sa;
2244         struct sadb_x_policy *pol;
2245         struct xfrm_policy *xp;
2246         struct km_event c;
2247         struct sadb_x_sec_ctx *sec_ctx;
2248
2249         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2250                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2251             !ext_hdrs[SADB_X_EXT_POLICY-1])
2252                 return -EINVAL;
2253
2254         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2255         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2256                 return -EINVAL;
2257         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2258                 return -EINVAL;
2259
2260         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2261         if (xp == NULL)
2262                 return -ENOBUFS;
2263
2264         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2265                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2266         xp->priority = pol->sadb_x_policy_priority;
2267
2268         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2269         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2270         xp->selector.family = xp->family;
2271         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2272         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2273         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2274         if (xp->selector.sport)
2275                 xp->selector.sport_mask = htons(0xffff);
2276
2277         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2278         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2279         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2280
2281         /* Amusing, we set this twice.  KAME apps appear to set same value
2282          * in both addresses.
2283          */
2284         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2285
2286         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2287         if (xp->selector.dport)
2288                 xp->selector.dport_mask = htons(0xffff);
2289
2290         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2291         if (sec_ctx != NULL) {
2292                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2293
2294                 if (!uctx) {
2295                         err = -ENOBUFS;
2296                         goto out;
2297                 }
2298
2299                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2300                 kfree(uctx);
2301
2302                 if (err)
2303                         goto out;
2304         }
2305
2306         xp->lft.soft_byte_limit = XFRM_INF;
2307         xp->lft.hard_byte_limit = XFRM_INF;
2308         xp->lft.soft_packet_limit = XFRM_INF;
2309         xp->lft.hard_packet_limit = XFRM_INF;
2310         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2311                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2312                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2313                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2314                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2315         }
2316         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2317                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2318                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2319                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2320                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2321         }
2322         xp->xfrm_nr = 0;
2323         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2324             (err = parse_ipsecrequests(xp, pol)) < 0)
2325                 goto out;
2326
2327         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2328                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2329
2330         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2331
2332         if (err)
2333                 goto out;
2334
2335         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2336                 c.event = XFRM_MSG_UPDPOLICY;
2337         else
2338                 c.event = XFRM_MSG_NEWPOLICY;
2339
2340         c.seq = hdr->sadb_msg_seq;
2341         c.portid = hdr->sadb_msg_pid;
2342
2343         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2344         xfrm_pol_put(xp);
2345         return 0;
2346
2347 out:
2348         xp->walk.dead = 1;
2349         xfrm_policy_destroy(xp);
2350         return err;
2351 }
2352
2353 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2354 {
2355         struct net *net = sock_net(sk);
2356         int err;
2357         struct sadb_address *sa;
2358         struct sadb_x_policy *pol;
2359         struct xfrm_policy *xp;
2360         struct xfrm_selector sel;
2361         struct km_event c;
2362         struct sadb_x_sec_ctx *sec_ctx;
2363         struct xfrm_sec_ctx *pol_ctx = NULL;
2364
2365         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2366                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2367             !ext_hdrs[SADB_X_EXT_POLICY-1])
2368                 return -EINVAL;
2369
2370         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2371         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2372                 return -EINVAL;
2373
2374         memset(&sel, 0, sizeof(sel));
2375
2376         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2377         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2378         sel.prefixlen_s = sa->sadb_address_prefixlen;
2379         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2380         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2381         if (sel.sport)
2382                 sel.sport_mask = htons(0xffff);
2383
2384         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2385         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2386         sel.prefixlen_d = sa->sadb_address_prefixlen;
2387         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2388         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2389         if (sel.dport)
2390                 sel.dport_mask = htons(0xffff);
2391
2392         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2393         if (sec_ctx != NULL) {
2394                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2395
2396                 if (!uctx)
2397                         return -ENOMEM;
2398
2399                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2400                 kfree(uctx);
2401                 if (err)
2402                         return err;
2403         }
2404
2405         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2406                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2407                                    1, &err);
2408         security_xfrm_policy_free(pol_ctx);
2409         if (xp == NULL)
2410                 return -ENOENT;
2411
2412         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2413
2414         if (err)
2415                 goto out;
2416
2417         c.seq = hdr->sadb_msg_seq;
2418         c.portid = hdr->sadb_msg_pid;
2419         c.data.byid = 0;
2420         c.event = XFRM_MSG_DELPOLICY;
2421         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2422
2423 out:
2424         xfrm_pol_put(xp);
2425         return err;
2426 }
2427
2428 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2429 {
2430         int err;
2431         struct sk_buff *out_skb;
2432         struct sadb_msg *out_hdr;
2433         err = 0;
2434
2435         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2436         if (IS_ERR(out_skb)) {
2437                 err =  PTR_ERR(out_skb);
2438                 goto out;
2439         }
2440         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2441         if (err < 0)
2442                 goto out;
2443
2444         out_hdr = (struct sadb_msg *) out_skb->data;
2445         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2446         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2447         out_hdr->sadb_msg_satype = 0;
2448         out_hdr->sadb_msg_errno = 0;
2449         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2450         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2451         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2452         err = 0;
2453
2454 out:
2455         return err;
2456 }
2457
2458 static int pfkey_sockaddr_pair_size(sa_family_t family)
2459 {
2460         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2461 }
2462
2463 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2464                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2465                                u16 *family)
2466 {
2467         int af, socklen;
2468
2469         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2470                 return -EINVAL;
2471
2472         af = pfkey_sockaddr_extract(sa, saddr);
2473         if (!af)
2474                 return -EINVAL;
2475
2476         socklen = pfkey_sockaddr_len(af);
2477         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2478                                    daddr) != af)
2479                 return -EINVAL;
2480
2481         *family = af;
2482         return 0;
2483 }
2484
2485 #ifdef CONFIG_NET_KEY_MIGRATE
2486 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2487                                     struct xfrm_migrate *m)
2488 {
2489         int err;
2490         struct sadb_x_ipsecrequest *rq2;
2491         int mode;
2492
2493         if (len < sizeof(*rq1) ||
2494             len < rq1->sadb_x_ipsecrequest_len ||
2495             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2496                 return -EINVAL;
2497
2498         /* old endoints */
2499         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2500                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2501                                   &m->old_saddr, &m->old_daddr,
2502                                   &m->old_family);
2503         if (err)
2504                 return err;
2505
2506         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2507         len -= rq1->sadb_x_ipsecrequest_len;
2508
2509         if (len <= sizeof(*rq2) ||
2510             len < rq2->sadb_x_ipsecrequest_len ||
2511             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2512                 return -EINVAL;
2513
2514         /* new endpoints */
2515         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2516                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2517                                   &m->new_saddr, &m->new_daddr,
2518                                   &m->new_family);
2519         if (err)
2520                 return err;
2521
2522         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2523             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2524             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2525                 return -EINVAL;
2526
2527         m->proto = rq1->sadb_x_ipsecrequest_proto;
2528         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2529                 return -EINVAL;
2530         m->mode = mode;
2531         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2532
2533         return ((int)(rq1->sadb_x_ipsecrequest_len +
2534                       rq2->sadb_x_ipsecrequest_len));
2535 }
2536
2537 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2538                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2539 {
2540         int i, len, ret, err = -EINVAL;
2541         u8 dir;
2542         struct sadb_address *sa;
2543         struct sadb_x_kmaddress *kma;
2544         struct sadb_x_policy *pol;
2545         struct sadb_x_ipsecrequest *rq;
2546         struct xfrm_selector sel;
2547         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2548         struct xfrm_kmaddress k;
2549         struct net *net = sock_net(sk);
2550
2551         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2552                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2553             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2554                 err = -EINVAL;
2555                 goto out;
2556         }
2557
2558         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2559         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2560
2561         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2562                 err = -EINVAL;
2563                 goto out;
2564         }
2565
2566         if (kma) {
2567                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2568                 k.reserved = kma->sadb_x_kmaddress_reserved;
2569                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2570                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2571                                           &k.local, &k.remote, &k.family);
2572                 if (ret < 0) {
2573                         err = ret;
2574                         goto out;
2575                 }
2576         }
2577
2578         dir = pol->sadb_x_policy_dir - 1;
2579         memset(&sel, 0, sizeof(sel));
2580
2581         /* set source address info of selector */
2582         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2583         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2584         sel.prefixlen_s = sa->sadb_address_prefixlen;
2585         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2586         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2587         if (sel.sport)
2588                 sel.sport_mask = htons(0xffff);
2589
2590         /* set destination address info of selector */
2591         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2592         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2593         sel.prefixlen_d = sa->sadb_address_prefixlen;
2594         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2595         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2596         if (sel.dport)
2597                 sel.dport_mask = htons(0xffff);
2598
2599         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2600
2601         /* extract ipsecrequests */
2602         i = 0;
2603         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2604
2605         while (len > 0 && i < XFRM_MAX_DEPTH) {
2606                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2607                 if (ret < 0) {
2608                         err = ret;
2609                         goto out;
2610                 } else {
2611                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2612                         len -= ret;
2613                         i++;
2614                 }
2615         }
2616
2617         if (!i || len > 0) {
2618                 err = -EINVAL;
2619                 goto out;
2620         }
2621
2622         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2623                             kma ? &k : NULL, net, NULL);
2624
2625  out:
2626         return err;
2627 }
2628 #else
2629 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2630                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2631 {
2632         return -ENOPROTOOPT;
2633 }
2634 #endif
2635
2636
2637 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2638 {
2639         struct net *net = sock_net(sk);
2640         unsigned int dir;
2641         int err = 0, delete;
2642         struct sadb_x_policy *pol;
2643         struct xfrm_policy *xp;
2644         struct km_event c;
2645
2646         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2647                 return -EINVAL;
2648
2649         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2650         if (dir >= XFRM_POLICY_MAX)
2651                 return -EINVAL;
2652
2653         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2654         xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2655                               dir, pol->sadb_x_policy_id, delete, &err);
2656         if (xp == NULL)
2657                 return -ENOENT;
2658
2659         if (delete) {
2660                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2661
2662                 if (err)
2663                         goto out;
2664                 c.seq = hdr->sadb_msg_seq;
2665                 c.portid = hdr->sadb_msg_pid;
2666                 c.data.byid = 1;
2667                 c.event = XFRM_MSG_DELPOLICY;
2668                 km_policy_notify(xp, dir, &c);
2669         } else {
2670                 err = key_pol_get_resp(sk, xp, hdr, dir);
2671         }
2672
2673 out:
2674         xfrm_pol_put(xp);
2675         return err;
2676 }
2677
2678 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2679 {
2680         struct pfkey_sock *pfk = ptr;
2681         struct sk_buff *out_skb;
2682         struct sadb_msg *out_hdr;
2683         int err;
2684
2685         if (!pfkey_can_dump(&pfk->sk))
2686                 return -ENOBUFS;
2687
2688         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2689         if (IS_ERR(out_skb))
2690                 return PTR_ERR(out_skb);
2691
2692         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2693         if (err < 0)
2694                 return err;
2695
2696         out_hdr = (struct sadb_msg *) out_skb->data;
2697         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2698         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2699         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2700         out_hdr->sadb_msg_errno = 0;
2701         out_hdr->sadb_msg_seq = count + 1;
2702         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2703
2704         if (pfk->dump.skb)
2705                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2706                                 &pfk->sk, sock_net(&pfk->sk));
2707         pfk->dump.skb = out_skb;
2708
2709         return 0;
2710 }
2711
2712 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2713 {
2714         struct net *net = sock_net(&pfk->sk);
2715         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2716 }
2717
2718 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2719 {
2720         struct net *net = sock_net((struct sock *)pfk);
2721
2722         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2723 }
2724
2725 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2726 {
2727         struct pfkey_sock *pfk = pfkey_sk(sk);
2728
2729         mutex_lock(&pfk->dump_lock);
2730         if (pfk->dump.dump != NULL) {
2731                 mutex_unlock(&pfk->dump_lock);
2732                 return -EBUSY;
2733         }
2734
2735         pfk->dump.msg_version = hdr->sadb_msg_version;
2736         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2737         pfk->dump.dump = pfkey_dump_sp;
2738         pfk->dump.done = pfkey_dump_sp_done;
2739         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2740         mutex_unlock(&pfk->dump_lock);
2741
2742         return pfkey_do_dump(pfk);
2743 }
2744
2745 static int key_notify_policy_flush(const struct km_event *c)
2746 {
2747         struct sk_buff *skb_out;
2748         struct sadb_msg *hdr;
2749
2750         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2751         if (!skb_out)
2752                 return -ENOBUFS;
2753         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2754         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2755         hdr->sadb_msg_seq = c->seq;
2756         hdr->sadb_msg_pid = c->portid;
2757         hdr->sadb_msg_version = PF_KEY_V2;
2758         hdr->sadb_msg_errno = (uint8_t) 0;
2759         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2760         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2761         hdr->sadb_msg_reserved = 0;
2762         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2763         return 0;
2764
2765 }
2766
2767 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2768 {
2769         struct net *net = sock_net(sk);
2770         struct km_event c;
2771         int err, err2;
2772
2773         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2774         err2 = unicast_flush_resp(sk, hdr);
2775         if (err || err2) {
2776                 if (err == -ESRCH) /* empty table - old silent behavior */
2777                         return 0;
2778                 return err;
2779         }
2780
2781         c.data.type = XFRM_POLICY_TYPE_MAIN;
2782         c.event = XFRM_MSG_FLUSHPOLICY;
2783         c.portid = hdr->sadb_msg_pid;
2784         c.seq = hdr->sadb_msg_seq;
2785         c.net = net;
2786         km_policy_notify(NULL, 0, &c);
2787
2788         return 0;
2789 }
2790
2791 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2792                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2793 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2794         [SADB_RESERVED]         = pfkey_reserved,
2795         [SADB_GETSPI]           = pfkey_getspi,
2796         [SADB_UPDATE]           = pfkey_add,
2797         [SADB_ADD]              = pfkey_add,
2798         [SADB_DELETE]           = pfkey_delete,
2799         [SADB_GET]              = pfkey_get,
2800         [SADB_ACQUIRE]          = pfkey_acquire,
2801         [SADB_REGISTER]         = pfkey_register,
2802         [SADB_EXPIRE]           = NULL,
2803         [SADB_FLUSH]            = pfkey_flush,
2804         [SADB_DUMP]             = pfkey_dump,
2805         [SADB_X_PROMISC]        = pfkey_promisc,
2806         [SADB_X_PCHANGE]        = NULL,
2807         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2808         [SADB_X_SPDADD]         = pfkey_spdadd,
2809         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2810         [SADB_X_SPDGET]         = pfkey_spdget,
2811         [SADB_X_SPDACQUIRE]     = NULL,
2812         [SADB_X_SPDDUMP]        = pfkey_spddump,
2813         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2814         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2815         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2816         [SADB_X_MIGRATE]        = pfkey_migrate,
2817 };
2818
2819 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2820 {
2821         void *ext_hdrs[SADB_EXT_MAX];
2822         int err;
2823
2824         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2825                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2826
2827         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2828         err = parse_exthdrs(skb, hdr, ext_hdrs);
2829         if (!err) {
2830                 err = -EOPNOTSUPP;
2831                 if (pfkey_funcs[hdr->sadb_msg_type])
2832                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2833         }
2834         return err;
2835 }
2836
2837 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2838 {
2839         struct sadb_msg *hdr = NULL;
2840
2841         if (skb->len < sizeof(*hdr)) {
2842                 *errp = -EMSGSIZE;
2843         } else {
2844                 hdr = (struct sadb_msg *) skb->data;
2845                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2846                     hdr->sadb_msg_reserved != 0 ||
2847                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2848                      hdr->sadb_msg_type > SADB_MAX)) {
2849                         hdr = NULL;
2850                         *errp = -EINVAL;
2851                 } else if (hdr->sadb_msg_len != (skb->len /
2852                                                  sizeof(uint64_t)) ||
2853                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2854                                                 sizeof(uint64_t))) {
2855                         hdr = NULL;
2856                         *errp = -EMSGSIZE;
2857                 } else {
2858                         *errp = 0;
2859                 }
2860         }
2861         return hdr;
2862 }
2863
2864 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2865                                 const struct xfrm_algo_desc *d)
2866 {
2867         unsigned int id = d->desc.sadb_alg_id;
2868
2869         if (id >= sizeof(t->aalgos) * 8)
2870                 return 0;
2871
2872         return (t->aalgos >> id) & 1;
2873 }
2874
2875 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2876                                 const struct xfrm_algo_desc *d)
2877 {
2878         unsigned int id = d->desc.sadb_alg_id;
2879
2880         if (id >= sizeof(t->ealgos) * 8)
2881                 return 0;
2882
2883         return (t->ealgos >> id) & 1;
2884 }
2885
2886 static int count_ah_combs(const struct xfrm_tmpl *t)
2887 {
2888         int i, sz = 0;
2889
2890         for (i = 0; ; i++) {
2891                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2892                 if (!aalg)
2893                         break;
2894                 if (!aalg->pfkey_supported)
2895                         continue;
2896                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2897                         sz += sizeof(struct sadb_comb);
2898         }
2899         return sz + sizeof(struct sadb_prop);
2900 }
2901
2902 static int count_esp_combs(const struct xfrm_tmpl *t)
2903 {
2904         int i, k, sz = 0;
2905
2906         for (i = 0; ; i++) {
2907                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2908                 if (!ealg)
2909                         break;
2910
2911                 if (!ealg->pfkey_supported)
2912                         continue;
2913
2914                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2915                         continue;
2916
2917                 for (k = 1; ; k++) {
2918                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2919                         if (!aalg)
2920                                 break;
2921
2922                         if (!aalg->pfkey_supported)
2923                                 continue;
2924
2925                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2926                                 sz += sizeof(struct sadb_comb);
2927                 }
2928         }
2929         return sz + sizeof(struct sadb_prop);
2930 }
2931
2932 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2933 {
2934         struct sadb_prop *p;
2935         int i;
2936
2937         p = skb_put(skb, sizeof(struct sadb_prop));
2938         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2939         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2940         p->sadb_prop_replay = 32;
2941         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2942
2943         for (i = 0; ; i++) {
2944                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2945                 if (!aalg)
2946                         break;
2947
2948                 if (!aalg->pfkey_supported)
2949                         continue;
2950
2951                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2952                         struct sadb_comb *c;
2953                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2954                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2955                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2956                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2957                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2958                         c->sadb_comb_hard_addtime = 24*60*60;
2959                         c->sadb_comb_soft_addtime = 20*60*60;
2960                         c->sadb_comb_hard_usetime = 8*60*60;
2961                         c->sadb_comb_soft_usetime = 7*60*60;
2962                 }
2963         }
2964 }
2965
2966 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2967 {
2968         struct sadb_prop *p;
2969         int i, k;
2970
2971         p = skb_put(skb, sizeof(struct sadb_prop));
2972         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2973         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2974         p->sadb_prop_replay = 32;
2975         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2976
2977         for (i=0; ; i++) {
2978                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2979                 if (!ealg)
2980                         break;
2981
2982                 if (!ealg->pfkey_supported)
2983                         continue;
2984
2985                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2986                         continue;
2987
2988                 for (k = 1; ; k++) {
2989                         struct sadb_comb *c;
2990                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2991                         if (!aalg)
2992                                 break;
2993                         if (!aalg->pfkey_supported)
2994                                 continue;
2995                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2996                                 continue;
2997                         c = skb_put(skb, sizeof(struct sadb_comb));
2998                         memset(c, 0, sizeof(*c));
2999                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3000                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3001                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3002                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3003                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3004                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3005                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3006                         c->sadb_comb_hard_addtime = 24*60*60;
3007                         c->sadb_comb_soft_addtime = 20*60*60;
3008                         c->sadb_comb_hard_usetime = 8*60*60;
3009                         c->sadb_comb_soft_usetime = 7*60*60;
3010                 }
3011         }
3012 }
3013
3014 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3015 {
3016         return 0;
3017 }
3018
3019 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3020 {
3021         struct sk_buff *out_skb;
3022         struct sadb_msg *out_hdr;
3023         int hard;
3024         int hsc;
3025
3026         hard = c->data.hard;
3027         if (hard)
3028                 hsc = 2;
3029         else
3030                 hsc = 1;
3031
3032         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3033         if (IS_ERR(out_skb))
3034                 return PTR_ERR(out_skb);
3035
3036         out_hdr = (struct sadb_msg *) out_skb->data;
3037         out_hdr->sadb_msg_version = PF_KEY_V2;
3038         out_hdr->sadb_msg_type = SADB_EXPIRE;
3039         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3040         out_hdr->sadb_msg_errno = 0;
3041         out_hdr->sadb_msg_reserved = 0;
3042         out_hdr->sadb_msg_seq = 0;
3043         out_hdr->sadb_msg_pid = 0;
3044
3045         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3046                         xs_net(x));
3047         return 0;
3048 }
3049
3050 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3051 {
3052         struct net *net = x ? xs_net(x) : c->net;
3053         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3054
3055         if (atomic_read(&net_pfkey->socks_nr) == 0)
3056                 return 0;
3057
3058         switch (c->event) {
3059         case XFRM_MSG_EXPIRE:
3060                 return key_notify_sa_expire(x, c);
3061         case XFRM_MSG_DELSA:
3062         case XFRM_MSG_NEWSA:
3063         case XFRM_MSG_UPDSA:
3064                 return key_notify_sa(x, c);
3065         case XFRM_MSG_FLUSHSA:
3066                 return key_notify_sa_flush(c);
3067         case XFRM_MSG_NEWAE: /* not yet supported */
3068                 break;
3069         default:
3070                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3071                 break;
3072         }
3073
3074         return 0;
3075 }
3076
3077 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3078 {
3079         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3080                 return 0;
3081
3082         switch (c->event) {
3083         case XFRM_MSG_POLEXPIRE:
3084                 return key_notify_policy_expire(xp, c);
3085         case XFRM_MSG_DELPOLICY:
3086         case XFRM_MSG_NEWPOLICY:
3087         case XFRM_MSG_UPDPOLICY:
3088                 return key_notify_policy(xp, dir, c);
3089         case XFRM_MSG_FLUSHPOLICY:
3090                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3091                         break;
3092                 return key_notify_policy_flush(c);
3093         default:
3094                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3095                 break;
3096         }
3097
3098         return 0;
3099 }
3100
3101 static u32 get_acqseq(void)
3102 {
3103         u32 res;
3104         static atomic_t acqseq;
3105
3106         do {
3107                 res = atomic_inc_return(&acqseq);
3108         } while (!res);
3109         return res;
3110 }
3111
3112 static bool pfkey_is_alive(const struct km_event *c)
3113 {
3114         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3115         struct sock *sk;
3116         bool is_alive = false;
3117
3118         rcu_read_lock();
3119         sk_for_each_rcu(sk, &net_pfkey->table) {
3120                 if (pfkey_sk(sk)->registered) {
3121                         is_alive = true;
3122                         break;
3123                 }
3124         }
3125         rcu_read_unlock();
3126
3127         return is_alive;
3128 }
3129
3130 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3131 {
3132         struct sk_buff *skb;
3133         struct sadb_msg *hdr;
3134         struct sadb_address *addr;
3135         struct sadb_x_policy *pol;
3136         int sockaddr_size;
3137         int size;
3138         struct sadb_x_sec_ctx *sec_ctx;
3139         struct xfrm_sec_ctx *xfrm_ctx;
3140         int ctx_size = 0;
3141
3142         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3143         if (!sockaddr_size)
3144                 return -EINVAL;
3145
3146         size = sizeof(struct sadb_msg) +
3147                 (sizeof(struct sadb_address) * 2) +
3148                 (sockaddr_size * 2) +
3149                 sizeof(struct sadb_x_policy);
3150
3151         if (x->id.proto == IPPROTO_AH)
3152                 size += count_ah_combs(t);
3153         else if (x->id.proto == IPPROTO_ESP)
3154                 size += count_esp_combs(t);
3155
3156         if ((xfrm_ctx = x->security)) {
3157                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3158                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3159         }
3160
3161         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3162         if (skb == NULL)
3163                 return -ENOMEM;
3164
3165         hdr = skb_put(skb, sizeof(struct sadb_msg));
3166         hdr->sadb_msg_version = PF_KEY_V2;
3167         hdr->sadb_msg_type = SADB_ACQUIRE;
3168         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3169         hdr->sadb_msg_len = size / sizeof(uint64_t);
3170         hdr->sadb_msg_errno = 0;
3171         hdr->sadb_msg_reserved = 0;
3172         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3173         hdr->sadb_msg_pid = 0;
3174
3175         /* src address */
3176         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3177         addr->sadb_address_len =
3178                 (sizeof(struct sadb_address)+sockaddr_size)/
3179                         sizeof(uint64_t);
3180         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3181         addr->sadb_address_proto = 0;
3182         addr->sadb_address_reserved = 0;
3183         addr->sadb_address_prefixlen =
3184                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3185                                     (struct sockaddr *) (addr + 1),
3186                                     x->props.family);
3187         if (!addr->sadb_address_prefixlen)
3188                 BUG();
3189
3190         /* dst address */
3191         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3192         addr->sadb_address_len =
3193                 (sizeof(struct sadb_address)+sockaddr_size)/
3194                         sizeof(uint64_t);
3195         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3196         addr->sadb_address_proto = 0;
3197         addr->sadb_address_reserved = 0;
3198         addr->sadb_address_prefixlen =
3199                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3200                                     (struct sockaddr *) (addr + 1),
3201                                     x->props.family);
3202         if (!addr->sadb_address_prefixlen)
3203                 BUG();
3204
3205         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3206         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3207         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3208         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3209         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3210         pol->sadb_x_policy_reserved = 0;
3211         pol->sadb_x_policy_id = xp->index;
3212         pol->sadb_x_policy_priority = xp->priority;
3213
3214         /* Set sadb_comb's. */
3215         if (x->id.proto == IPPROTO_AH)
3216                 dump_ah_combs(skb, t);
3217         else if (x->id.proto == IPPROTO_ESP)
3218                 dump_esp_combs(skb, t);
3219
3220         /* security context */
3221         if (xfrm_ctx) {
3222                 sec_ctx = skb_put(skb,
3223                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3224                 sec_ctx->sadb_x_sec_len =
3225                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3226                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3227                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3228                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3229                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3230                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3231                        xfrm_ctx->ctx_len);
3232         }
3233
3234         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3235                                xs_net(x));
3236 }
3237
3238 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3239                                                 u8 *data, int len, int *dir)
3240 {
3241         struct net *net = sock_net(sk);
3242         struct xfrm_policy *xp;
3243         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3244         struct sadb_x_sec_ctx *sec_ctx;
3245
3246         switch (sk->sk_family) {
3247         case AF_INET:
3248                 if (opt != IP_IPSEC_POLICY) {
3249                         *dir = -EOPNOTSUPP;
3250                         return NULL;
3251                 }
3252                 break;
3253 #if IS_ENABLED(CONFIG_IPV6)
3254         case AF_INET6:
3255                 if (opt != IPV6_IPSEC_POLICY) {
3256                         *dir = -EOPNOTSUPP;
3257                         return NULL;
3258                 }
3259                 break;
3260 #endif
3261         default:
3262                 *dir = -EINVAL;
3263                 return NULL;
3264         }
3265
3266         *dir = -EINVAL;
3267
3268         if (len < sizeof(struct sadb_x_policy) ||
3269             pol->sadb_x_policy_len*8 > len ||
3270             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3271             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3272                 return NULL;
3273
3274         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3275         if (xp == NULL) {
3276                 *dir = -ENOBUFS;
3277                 return NULL;
3278         }
3279
3280         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3281                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3282
3283         xp->lft.soft_byte_limit = XFRM_INF;
3284         xp->lft.hard_byte_limit = XFRM_INF;
3285         xp->lft.soft_packet_limit = XFRM_INF;
3286         xp->lft.hard_packet_limit = XFRM_INF;
3287         xp->family = sk->sk_family;
3288
3289         xp->xfrm_nr = 0;
3290         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3291             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3292                 goto out;
3293
3294         /* security context too */
3295         if (len >= (pol->sadb_x_policy_len*8 +
3296             sizeof(struct sadb_x_sec_ctx))) {
3297                 char *p = (char *)pol;
3298                 struct xfrm_user_sec_ctx *uctx;
3299
3300                 p += pol->sadb_x_policy_len*8;
3301                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3302                 if (len < pol->sadb_x_policy_len*8 +
3303                     sec_ctx->sadb_x_sec_len*8) {
3304                         *dir = -EINVAL;
3305                         goto out;
3306                 }
3307                 if ((*dir = verify_sec_ctx_len(p)))
3308                         goto out;
3309                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3310                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3311                 kfree(uctx);
3312
3313                 if (*dir)
3314                         goto out;
3315         }
3316
3317         *dir = pol->sadb_x_policy_dir-1;
3318         return xp;
3319
3320 out:
3321         xp->walk.dead = 1;
3322         xfrm_policy_destroy(xp);
3323         return NULL;
3324 }
3325
3326 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3327 {
3328         struct sk_buff *skb;
3329         struct sadb_msg *hdr;
3330         struct sadb_sa *sa;
3331         struct sadb_address *addr;
3332         struct sadb_x_nat_t_port *n_port;
3333         int sockaddr_size;
3334         int size;
3335         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3336         struct xfrm_encap_tmpl *natt = NULL;
3337
3338         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3339         if (!sockaddr_size)
3340                 return -EINVAL;
3341
3342         if (!satype)
3343                 return -EINVAL;
3344
3345         if (!x->encap)
3346                 return -EINVAL;
3347
3348         natt = x->encap;
3349
3350         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3351          *
3352          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3353          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3354          */
3355
3356         size = sizeof(struct sadb_msg) +
3357                 sizeof(struct sadb_sa) +
3358                 (sizeof(struct sadb_address) * 2) +
3359                 (sockaddr_size * 2) +
3360                 (sizeof(struct sadb_x_nat_t_port) * 2);
3361
3362         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3363         if (skb == NULL)
3364                 return -ENOMEM;
3365
3366         hdr = skb_put(skb, sizeof(struct sadb_msg));
3367         hdr->sadb_msg_version = PF_KEY_V2;
3368         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3369         hdr->sadb_msg_satype = satype;
3370         hdr->sadb_msg_len = size / sizeof(uint64_t);
3371         hdr->sadb_msg_errno = 0;
3372         hdr->sadb_msg_reserved = 0;
3373         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3374         hdr->sadb_msg_pid = 0;
3375
3376         /* SA */
3377         sa = skb_put(skb, sizeof(struct sadb_sa));
3378         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3379         sa->sadb_sa_exttype = SADB_EXT_SA;
3380         sa->sadb_sa_spi = x->id.spi;
3381         sa->sadb_sa_replay = 0;
3382         sa->sadb_sa_state = 0;
3383         sa->sadb_sa_auth = 0;
3384         sa->sadb_sa_encrypt = 0;
3385         sa->sadb_sa_flags = 0;
3386
3387         /* ADDRESS_SRC (old addr) */
3388         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3389         addr->sadb_address_len =
3390                 (sizeof(struct sadb_address)+sockaddr_size)/
3391                         sizeof(uint64_t);
3392         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3393         addr->sadb_address_proto = 0;
3394         addr->sadb_address_reserved = 0;
3395         addr->sadb_address_prefixlen =
3396                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3397                                     (struct sockaddr *) (addr + 1),
3398                                     x->props.family);
3399         if (!addr->sadb_address_prefixlen)
3400                 BUG();
3401
3402         /* NAT_T_SPORT (old port) */
3403         n_port = skb_put(skb, sizeof(*n_port));
3404         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3405         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3406         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3407         n_port->sadb_x_nat_t_port_reserved = 0;
3408
3409         /* ADDRESS_DST (new addr) */
3410         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3411         addr->sadb_address_len =
3412                 (sizeof(struct sadb_address)+sockaddr_size)/
3413                         sizeof(uint64_t);
3414         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3415         addr->sadb_address_proto = 0;
3416         addr->sadb_address_reserved = 0;
3417         addr->sadb_address_prefixlen =
3418                 pfkey_sockaddr_fill(ipaddr, 0,
3419                                     (struct sockaddr *) (addr + 1),
3420                                     x->props.family);
3421         if (!addr->sadb_address_prefixlen)
3422                 BUG();
3423
3424         /* NAT_T_DPORT (new port) */
3425         n_port = skb_put(skb, sizeof(*n_port));
3426         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3427         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3428         n_port->sadb_x_nat_t_port_port = sport;
3429         n_port->sadb_x_nat_t_port_reserved = 0;
3430
3431         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3432                                xs_net(x));
3433 }
3434
3435 #ifdef CONFIG_NET_KEY_MIGRATE
3436 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3437                             const struct xfrm_selector *sel)
3438 {
3439         struct sadb_address *addr;
3440         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3441         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3442         addr->sadb_address_exttype = type;
3443         addr->sadb_address_proto = sel->proto;
3444         addr->sadb_address_reserved = 0;
3445
3446         switch (type) {
3447         case SADB_EXT_ADDRESS_SRC:
3448                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3449                 pfkey_sockaddr_fill(&sel->saddr, 0,
3450                                     (struct sockaddr *)(addr + 1),
3451                                     sel->family);
3452                 break;
3453         case SADB_EXT_ADDRESS_DST:
3454                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3455                 pfkey_sockaddr_fill(&sel->daddr, 0,
3456                                     (struct sockaddr *)(addr + 1),
3457                                     sel->family);
3458                 break;
3459         default:
3460                 return -EINVAL;
3461         }
3462
3463         return 0;
3464 }
3465
3466
3467 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3468 {
3469         struct sadb_x_kmaddress *kma;
3470         u8 *sa;
3471         int family = k->family;
3472         int socklen = pfkey_sockaddr_len(family);
3473         int size_req;
3474
3475         size_req = (sizeof(struct sadb_x_kmaddress) +
3476                     pfkey_sockaddr_pair_size(family));
3477
3478         kma = skb_put_zero(skb, size_req);
3479         kma->sadb_x_kmaddress_len = size_req / 8;
3480         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3481         kma->sadb_x_kmaddress_reserved = k->reserved;
3482
3483         sa = (u8 *)(kma + 1);
3484         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3485             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3486                 return -EINVAL;
3487
3488         return 0;
3489 }
3490
3491 static int set_ipsecrequest(struct sk_buff *skb,
3492                             uint8_t proto, uint8_t mode, int level,
3493                             uint32_t reqid, uint8_t family,
3494                             const xfrm_address_t *src, const xfrm_address_t *dst)
3495 {
3496         struct sadb_x_ipsecrequest *rq;
3497         u8 *sa;
3498         int socklen = pfkey_sockaddr_len(family);
3499         int size_req;
3500
3501         size_req = sizeof(struct sadb_x_ipsecrequest) +
3502                    pfkey_sockaddr_pair_size(family);
3503
3504         rq = skb_put_zero(skb, size_req);
3505         rq->sadb_x_ipsecrequest_len = size_req;
3506         rq->sadb_x_ipsecrequest_proto = proto;
3507         rq->sadb_x_ipsecrequest_mode = mode;
3508         rq->sadb_x_ipsecrequest_level = level;
3509         rq->sadb_x_ipsecrequest_reqid = reqid;
3510
3511         sa = (u8 *) (rq + 1);
3512         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3513             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3514                 return -EINVAL;
3515
3516         return 0;
3517 }
3518 #endif
3519
3520 #ifdef CONFIG_NET_KEY_MIGRATE
3521 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3522                               const struct xfrm_migrate *m, int num_bundles,
3523                               const struct xfrm_kmaddress *k,
3524                               const struct xfrm_encap_tmpl *encap)
3525 {
3526         int i;
3527         int sasize_sel;
3528         int size = 0;
3529         int size_pol = 0;
3530         struct sk_buff *skb;
3531         struct sadb_msg *hdr;
3532         struct sadb_x_policy *pol;
3533         const struct xfrm_migrate *mp;
3534
3535         if (type != XFRM_POLICY_TYPE_MAIN)
3536                 return 0;
3537
3538         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3539                 return -EINVAL;
3540
3541         if (k != NULL) {
3542                 /* addresses for KM */
3543                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3544                                      pfkey_sockaddr_pair_size(k->family));
3545         }
3546
3547         /* selector */
3548         sasize_sel = pfkey_sockaddr_size(sel->family);
3549         if (!sasize_sel)
3550                 return -EINVAL;
3551         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3552
3553         /* policy info */
3554         size_pol += sizeof(struct sadb_x_policy);
3555
3556         /* ipsecrequests */
3557         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3558                 /* old locator pair */
3559                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3560                             pfkey_sockaddr_pair_size(mp->old_family);
3561                 /* new locator pair */
3562                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3563                             pfkey_sockaddr_pair_size(mp->new_family);
3564         }
3565
3566         size += sizeof(struct sadb_msg) + size_pol;
3567
3568         /* alloc buffer */
3569         skb = alloc_skb(size, GFP_ATOMIC);
3570         if (skb == NULL)
3571                 return -ENOMEM;
3572
3573         hdr = skb_put(skb, sizeof(struct sadb_msg));
3574         hdr->sadb_msg_version = PF_KEY_V2;
3575         hdr->sadb_msg_type = SADB_X_MIGRATE;
3576         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3577         hdr->sadb_msg_len = size / 8;
3578         hdr->sadb_msg_errno = 0;
3579         hdr->sadb_msg_reserved = 0;
3580         hdr->sadb_msg_seq = 0;
3581         hdr->sadb_msg_pid = 0;
3582
3583         /* Addresses to be used by KM for negotiation, if ext is available */
3584         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3585                 goto err;
3586
3587         /* selector src */
3588         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3589
3590         /* selector dst */
3591         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3592
3593         /* policy information */
3594         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3595         pol->sadb_x_policy_len = size_pol / 8;
3596         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3597         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3598         pol->sadb_x_policy_dir = dir + 1;
3599         pol->sadb_x_policy_reserved = 0;
3600         pol->sadb_x_policy_id = 0;
3601         pol->sadb_x_policy_priority = 0;
3602
3603         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3604                 /* old ipsecrequest */
3605                 int mode = pfkey_mode_from_xfrm(mp->mode);
3606                 if (mode < 0)
3607                         goto err;
3608                 if (set_ipsecrequest(skb, mp->proto, mode,
3609                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3610                                      mp->reqid, mp->old_family,
3611                                      &mp->old_saddr, &mp->old_daddr) < 0)
3612                         goto err;
3613
3614                 /* new ipsecrequest */
3615                 if (set_ipsecrequest(skb, mp->proto, mode,
3616                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3617                                      mp->reqid, mp->new_family,
3618                                      &mp->new_saddr, &mp->new_daddr) < 0)
3619                         goto err;
3620         }
3621
3622         /* broadcast migrate message to sockets */
3623         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3624
3625         return 0;
3626
3627 err:
3628         kfree_skb(skb);
3629         return -EINVAL;
3630 }
3631 #else
3632 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3633                               const struct xfrm_migrate *m, int num_bundles,
3634                               const struct xfrm_kmaddress *k,
3635                               const struct xfrm_encap_tmpl *encap)
3636 {
3637         return -ENOPROTOOPT;
3638 }
3639 #endif
3640
3641 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3642 {
3643         struct sock *sk = sock->sk;
3644         struct sk_buff *skb = NULL;
3645         struct sadb_msg *hdr = NULL;
3646         int err;
3647         struct net *net = sock_net(sk);
3648
3649         err = -EOPNOTSUPP;
3650         if (msg->msg_flags & MSG_OOB)
3651                 goto out;
3652
3653         err = -EMSGSIZE;
3654         if ((unsigned int)len > sk->sk_sndbuf - 32)
3655                 goto out;
3656
3657         err = -ENOBUFS;
3658         skb = alloc_skb(len, GFP_KERNEL);
3659         if (skb == NULL)
3660                 goto out;
3661
3662         err = -EFAULT;
3663         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3664                 goto out;
3665
3666         hdr = pfkey_get_base_msg(skb, &err);
3667         if (!hdr)
3668                 goto out;
3669
3670         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3671         err = pfkey_process(sk, skb, hdr);
3672         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3673
3674 out:
3675         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3676                 err = 0;
3677         kfree_skb(skb);
3678
3679         return err ? : len;
3680 }
3681
3682 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3683                          int flags)
3684 {
3685         struct sock *sk = sock->sk;
3686         struct pfkey_sock *pfk = pfkey_sk(sk);
3687         struct sk_buff *skb;
3688         int copied, err;
3689
3690         err = -EINVAL;
3691         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3692                 goto out;
3693
3694         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3695         if (skb == NULL)
3696                 goto out;
3697
3698         copied = skb->len;
3699         if (copied > len) {
3700                 msg->msg_flags |= MSG_TRUNC;
3701                 copied = len;
3702         }
3703
3704         skb_reset_transport_header(skb);
3705         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3706         if (err)
3707                 goto out_free;
3708
3709         sock_recv_ts_and_drops(msg, sk, skb);
3710
3711         err = (flags & MSG_TRUNC) ? skb->len : copied;
3712
3713         if (pfk->dump.dump != NULL &&
3714             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3715                 pfkey_do_dump(pfk);
3716
3717 out_free:
3718         skb_free_datagram(sk, skb);
3719 out:
3720         return err;
3721 }
3722
3723 static const struct proto_ops pfkey_ops = {
3724         .family         =       PF_KEY,
3725         .owner          =       THIS_MODULE,
3726         /* Operations that make no sense on pfkey sockets. */
3727         .bind           =       sock_no_bind,
3728         .connect        =       sock_no_connect,
3729         .socketpair     =       sock_no_socketpair,
3730         .accept         =       sock_no_accept,
3731         .getname        =       sock_no_getname,
3732         .ioctl          =       sock_no_ioctl,
3733         .listen         =       sock_no_listen,
3734         .shutdown       =       sock_no_shutdown,
3735         .setsockopt     =       sock_no_setsockopt,
3736         .getsockopt     =       sock_no_getsockopt,
3737         .mmap           =       sock_no_mmap,
3738         .sendpage       =       sock_no_sendpage,
3739
3740         /* Now the operations that really occur. */
3741         .release        =       pfkey_release,
3742         .poll           =       datagram_poll,
3743         .sendmsg        =       pfkey_sendmsg,
3744         .recvmsg        =       pfkey_recvmsg,
3745 };
3746
3747 static const struct net_proto_family pfkey_family_ops = {
3748         .family =       PF_KEY,
3749         .create =       pfkey_create,
3750         .owner  =       THIS_MODULE,
3751 };
3752
3753 #ifdef CONFIG_PROC_FS
3754 static int pfkey_seq_show(struct seq_file *f, void *v)
3755 {
3756         struct sock *s = sk_entry(v);
3757
3758         if (v == SEQ_START_TOKEN)
3759                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3760         else
3761                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3762                                s,
3763                                refcount_read(&s->sk_refcnt),
3764                                sk_rmem_alloc_get(s),
3765                                sk_wmem_alloc_get(s),
3766                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3767                                sock_i_ino(s)
3768                                );
3769         return 0;
3770 }
3771
3772 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3773         __acquires(rcu)
3774 {
3775         struct net *net = seq_file_net(f);
3776         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3777
3778         rcu_read_lock();
3779         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3780 }
3781
3782 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3783 {
3784         struct net *net = seq_file_net(f);
3785         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3786
3787         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3788 }
3789
3790 static void pfkey_seq_stop(struct seq_file *f, void *v)
3791         __releases(rcu)
3792 {
3793         rcu_read_unlock();
3794 }
3795
3796 static const struct seq_operations pfkey_seq_ops = {
3797         .start  = pfkey_seq_start,
3798         .next   = pfkey_seq_next,
3799         .stop   = pfkey_seq_stop,
3800         .show   = pfkey_seq_show,
3801 };
3802
3803 static int __net_init pfkey_init_proc(struct net *net)
3804 {
3805         struct proc_dir_entry *e;
3806
3807         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3808                         sizeof(struct seq_net_private));
3809         if (e == NULL)
3810                 return -ENOMEM;
3811
3812         return 0;
3813 }
3814
3815 static void __net_exit pfkey_exit_proc(struct net *net)
3816 {
3817         remove_proc_entry("pfkey", net->proc_net);
3818 }
3819 #else
3820 static inline int pfkey_init_proc(struct net *net)
3821 {
3822         return 0;
3823 }
3824
3825 static inline void pfkey_exit_proc(struct net *net)
3826 {
3827 }
3828 #endif
3829
3830 static struct xfrm_mgr pfkeyv2_mgr =
3831 {
3832         .notify         = pfkey_send_notify,
3833         .acquire        = pfkey_send_acquire,
3834         .compile_policy = pfkey_compile_policy,
3835         .new_mapping    = pfkey_send_new_mapping,
3836         .notify_policy  = pfkey_send_policy_notify,
3837         .migrate        = pfkey_send_migrate,
3838         .is_alive       = pfkey_is_alive,
3839 };
3840
3841 static int __net_init pfkey_net_init(struct net *net)
3842 {
3843         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3844         int rv;
3845
3846         INIT_HLIST_HEAD(&net_pfkey->table);
3847         atomic_set(&net_pfkey->socks_nr, 0);
3848
3849         rv = pfkey_init_proc(net);
3850
3851         return rv;
3852 }
3853
3854 static void __net_exit pfkey_net_exit(struct net *net)
3855 {
3856         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3857
3858         pfkey_exit_proc(net);
3859         WARN_ON(!hlist_empty(&net_pfkey->table));
3860 }
3861
3862 static struct pernet_operations pfkey_net_ops = {
3863         .init = pfkey_net_init,
3864         .exit = pfkey_net_exit,
3865         .id   = &pfkey_net_id,
3866         .size = sizeof(struct netns_pfkey),
3867 };
3868
3869 static void __exit ipsec_pfkey_exit(void)
3870 {
3871         xfrm_unregister_km(&pfkeyv2_mgr);
3872         sock_unregister(PF_KEY);
3873         unregister_pernet_subsys(&pfkey_net_ops);
3874         proto_unregister(&key_proto);
3875 }
3876
3877 static int __init ipsec_pfkey_init(void)
3878 {
3879         int err = proto_register(&key_proto, 0);
3880
3881         if (err != 0)
3882                 goto out;
3883
3884         err = register_pernet_subsys(&pfkey_net_ops);
3885         if (err != 0)
3886                 goto out_unregister_key_proto;
3887         err = sock_register(&pfkey_family_ops);
3888         if (err != 0)
3889                 goto out_unregister_pernet;
3890         err = xfrm_register_km(&pfkeyv2_mgr);
3891         if (err != 0)
3892                 goto out_sock_unregister;
3893 out:
3894         return err;
3895
3896 out_sock_unregister:
3897         sock_unregister(PF_KEY);
3898 out_unregister_pernet:
3899         unregister_pernet_subsys(&pfkey_net_ops);
3900 out_unregister_key_proto:
3901         proto_unregister(&key_proto);
3902         goto out;
3903 }
3904
3905 module_init(ipsec_pfkey_init);
3906 module_exit(ipsec_pfkey_exit);
3907 MODULE_LICENSE("GPL");
3908 MODULE_ALIAS_NETPROTO(PF_KEY);