net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static unsigned int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static const struct xfrm_mark dummy_mark = {0, 0};
  49 struct pfkey_sock {
  50         /* struct sock must be the first member of struct pfkey_sock */
  51         struct sock     sk;
  52         int             registered;
  53         int             promisc;
  54
  55         struct {
  56                 uint8_t         msg_version;
  57                 uint32_t        msg_portid;
  58                 int             (*dump)(struct pfkey_sock *sk);
  59                 void            (*done)(struct pfkey_sock *sk);
  60                 union {
  61                         struct xfrm_policy_walk policy;
  62                         struct xfrm_state_walk  state;
  63                 } u;
  64                 struct sk_buff  *skb;
  65         } dump;
  66         struct mutex dump_lock;
  67 };
  68
  69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  70                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  71                                u16 *family);
  72
  73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  74 {
  75         return (struct pfkey_sock *)sk;
  76 }
  77
  78 static int pfkey_can_dump(const struct sock *sk)
  79 {
  80         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  81                 return 1;
  82         return 0;
  83 }
  84
  85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  86 {
  87         if (pfk->dump.dump) {
  88                 if (pfk->dump.skb) {
  89                         kfree_skb(pfk->dump.skb);
  90                         pfk->dump.skb = NULL;
  91                 }
  92                 pfk->dump.done(pfk);
  93                 pfk->dump.dump = NULL;
  94                 pfk->dump.done = NULL;
  95         }
  96 }
  97
  98 static void pfkey_sock_destruct(struct sock *sk)
  99 {
 100         struct net *net = sock_net(sk);
 101         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 102
 103         pfkey_terminate_dump(pfkey_sk(sk));
 104         skb_queue_purge(&sk->sk_receive_queue);
 105
 106         if (!sock_flag(sk, SOCK_DEAD)) {
 107                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 108                 return;
 109         }
 110
 111         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 112         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 113
 114         atomic_dec(&net_pfkey->socks_nr);
 115 }
 116
 117 static const struct proto_ops pfkey_ops;
 118
 119 static void pfkey_insert(struct sock *sk)
 120 {
 121         struct net *net = sock_net(sk);
 122         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 123
 124         mutex_lock(&pfkey_mutex);
 125         sk_add_node_rcu(sk, &net_pfkey->table);
 126         mutex_unlock(&pfkey_mutex);
 127 }
 128
 129 static void pfkey_remove(struct sock *sk)
 130 {
 131         mutex_lock(&pfkey_mutex);
 132         sk_del_node_init_rcu(sk);
 133         mutex_unlock(&pfkey_mutex);
 134 }
 135
 136 static struct proto key_proto = {
 137         .name     = "KEY",
 138         .owner    = THIS_MODULE,
 139         .obj_size = sizeof(struct pfkey_sock),
 140 };
 141
 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 143                         int kern)
 144 {
 145         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 146         struct sock *sk;
 147         struct pfkey_sock *pfk;
 148         int err;
 149
 150         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 151                 return -EPERM;
 152         if (sock->type != SOCK_RAW)
 153                 return -ESOCKTNOSUPPORT;
 154         if (protocol != PF_KEY_V2)
 155                 return -EPROTONOSUPPORT;
 156
 157         err = -ENOMEM;
 158         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 159         if (sk == NULL)
 160                 goto out;
 161
 162         pfk = pfkey_sk(sk);
 163         mutex_init(&pfk->dump_lock);
 164
 165         sock->ops = &pfkey_ops;
 166         sock_init_data(sock, sk);
 167
 168         sk->sk_family = PF_KEY;
 169         sk->sk_destruct = pfkey_sock_destruct;
 170
 171         atomic_inc(&net_pfkey->socks_nr);
 172
 173         pfkey_insert(sk);
 174
 175         return 0;
 176 out:
 177         return err;
 178 }
 179
 180 static int pfkey_release(struct socket *sock)
 181 {
 182         struct sock *sk = sock->sk;
 183
 184         if (!sk)
 185                 return 0;
 186
 187         pfkey_remove(sk);
 188
 189         sock_orphan(sk);
 190         sock->sk = NULL;
 191         skb_queue_purge(&sk->sk_write_queue);
 192
 193         synchronize_rcu();
 194         sock_put(sk);
 195
 196         return 0;
 197 }
 198
 199 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
 200                                struct sock *sk)
 201 {
 202         int err = -ENOBUFS;
 203
 204         if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 205                 return err;
 206
 207         skb = skb_clone(skb, allocation);
 208
 209         if (skb) {
 210                 skb_set_owner_r(skb, sk);
 211                 skb_queue_tail(&sk->sk_receive_queue, skb);
 212                 sk->sk_data_ready(sk);
 213                 err = 0;
 214         }
 215         return err;
 216 }
 217
 218 /* Send SKB to all pfkey sockets matching selected criteria.  */
 219 #define BROADCAST_ALL           0
 220 #define BROADCAST_ONE           1
 221 #define BROADCAST_REGISTERED    2
 222 #define BROADCAST_PROMISC_ONLY  4
 223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 224                            int broadcast_flags, struct sock *one_sk,
 225                            struct net *net)
 226 {
 227         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 228         struct sock *sk;
 229         int err = -ESRCH;
 230
 231         /* XXX Do we need something like netlink_overrun?  I think
 232          * XXX PF_KEY socket apps will not mind current behavior.
 233          */
 234         if (!skb)
 235                 return -ENOMEM;
 236
 237         rcu_read_lock();
 238         sk_for_each_rcu(sk, &net_pfkey->table) {
 239                 struct pfkey_sock *pfk = pfkey_sk(sk);
 240                 int err2;
 241
 242                 /* Yes, it means that if you are meant to receive this
 243                  * pfkey message you receive it twice as promiscuous
 244                  * socket.
 245                  */
 246                 if (pfk->promisc)
 247                         pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 248
 249                 /* the exact target will be processed later */
 250                 if (sk == one_sk)
 251                         continue;
 252                 if (broadcast_flags != BROADCAST_ALL) {
 253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 254                                 continue;
 255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 256                             !pfk->registered)
 257                                 continue;
 258                         if (broadcast_flags & BROADCAST_ONE)
 259                                 continue;
 260                 }
 261
 262                 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 263
 264                 /* Error is cleared after successful sending to at least one
 265                  * registered KM */
 266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 267                         err = err2;
 268         }
 269         rcu_read_unlock();
 270
 271         if (one_sk != NULL)
 272                 err = pfkey_broadcast_one(skb, allocation, one_sk);
 273
 274         kfree_skb(skb);
 275         return err;
 276 }
 277
 278 static int pfkey_do_dump(struct pfkey_sock *pfk)
 279 {
 280         struct sadb_msg *hdr;
 281         int rc;
 282
 283         mutex_lock(&pfk->dump_lock);
 284         if (!pfk->dump.dump) {
 285                 rc = 0;
 286                 goto out;
 287         }
 288
 289         rc = pfk->dump.dump(pfk);
 290         if (rc == -ENOBUFS) {
 291                 rc = 0;
 292                 goto out;
 293         }
 294
 295         if (pfk->dump.skb) {
 296                 if (!pfkey_can_dump(&pfk->sk)) {
 297                         rc = 0;
 298                         goto out;
 299                 }
 300
 301                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 302                 hdr->sadb_msg_seq = 0;
 303                 hdr->sadb_msg_errno = rc;
 304                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 305                                 &pfk->sk, sock_net(&pfk->sk));
 306                 pfk->dump.skb = NULL;
 307         }
 308
 309         pfkey_terminate_dump(pfk);
 310
 311 out:
 312         mutex_unlock(&pfk->dump_lock);
 313         return rc;
 314 }
 315
 316 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 317                                  const struct sadb_msg *orig)
 318 {
 319         *new = *orig;
 320 }
 321
 322 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 323 {
 324         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 325         struct sadb_msg *hdr;
 326
 327         if (!skb)
 328                 return -ENOBUFS;
 329
 330         /* Woe be to the platform trying to support PFKEY yet
 331          * having normal errnos outside the 1-255 range, inclusive.
 332          */
 333         err = -err;
 334         if (err == ERESTARTSYS ||
 335             err == ERESTARTNOHAND ||
 336             err == ERESTARTNOINTR)
 337                 err = EINTR;
 338         if (err >= 512)
 339                 err = EINVAL;
 340         BUG_ON(err <= 0 || err >= 256);
 341
 342         hdr = skb_put(skb, sizeof(struct sadb_msg));
 343         pfkey_hdr_dup(hdr, orig);
 344         hdr->sadb_msg_errno = (uint8_t) err;
 345         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 346                              sizeof(uint64_t));
 347
 348         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 349
 350         return 0;
 351 }
 352
 353 static const u8 sadb_ext_min_len[] = {
 354         [SADB_EXT_RESERVED]             = (u8) 0,
 355         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 356         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 357         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 358         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 359         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 360         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 361         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 362         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 363         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 364         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 365         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 366         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 367         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 368         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 369         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 370         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 371         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 372         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 373         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 374         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 375         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 376         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 377         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 378         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 379         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 380         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 381 };
 382
 383 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 384 static int verify_address_len(const void *p)
 385 {
 386         const struct sadb_address *sp = p;
 387         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 388         const struct sockaddr_in *sin;
 389 #if IS_ENABLED(CONFIG_IPV6)
 390         const struct sockaddr_in6 *sin6;
 391 #endif
 392         int len;
 393
 394         if (sp->sadb_address_len <
 395             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 396                          sizeof(uint64_t)))
 397                 return -EINVAL;
 398
 399         switch (addr->sa_family) {
 400         case AF_INET:
 401                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 402                 if (sp->sadb_address_len != len ||
 403                     sp->sadb_address_prefixlen > 32)
 404                         return -EINVAL;
 405                 break;
 406 #if IS_ENABLED(CONFIG_IPV6)
 407         case AF_INET6:
 408                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 409                 if (sp->sadb_address_len != len ||
 410                     sp->sadb_address_prefixlen > 128)
 411                         return -EINVAL;
 412                 break;
 413 #endif
 414         default:
 415                 /* It is user using kernel to keep track of security
 416                  * associations for another protocol, such as
 417                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 418                  * lengths.
 419                  *
 420                  * XXX Actually, association/policy database is not yet
 421                  * XXX able to cope with arbitrary sockaddr families.
 422                  * XXX When it can, remove this -EINVAL.  -DaveM
 423                  */
 424                 return -EINVAL;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static inline int sadb_key_len(const struct sadb_key *key)
 431 {
 432         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 433
 434         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 435                             sizeof(uint64_t));
 436 }
 437
 438 static int verify_key_len(const void *p)
 439 {
 440         const struct sadb_key *key = p;
 441
 442         if (sadb_key_len(key) > key->sadb_key_len)
 443                 return -EINVAL;
 444
 445         return 0;
 446 }
 447
 448 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 449 {
 450         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 451                             sec_ctx->sadb_x_ctx_len,
 452                             sizeof(uint64_t));
 453 }
 454
 455 static inline int verify_sec_ctx_len(const void *p)
 456 {
 457         const struct sadb_x_sec_ctx *sec_ctx = p;
 458         int len = sec_ctx->sadb_x_ctx_len;
 459
 460         if (len > PAGE_SIZE)
 461                 return -EINVAL;
 462
 463         len = pfkey_sec_ctx_len(sec_ctx);
 464
 465         if (sec_ctx->sadb_x_sec_len != len)
 466                 return -EINVAL;
 467
 468         return 0;
 469 }
 470
 471 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 472                                                                      gfp_t gfp)
 473 {
 474         struct xfrm_user_sec_ctx *uctx = NULL;
 475         int ctx_size = sec_ctx->sadb_x_ctx_len;
 476
 477         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 478
 479         if (!uctx)
 480                 return NULL;
 481
 482         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 483         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 484         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 485         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 486         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 487         memcpy(uctx + 1, sec_ctx + 1,
 488                uctx->ctx_len);
 489
 490         return uctx;
 491 }
 492
 493 static int present_and_same_family(const struct sadb_address *src,
 494                                    const struct sadb_address *dst)
 495 {
 496         const struct sockaddr *s_addr, *d_addr;
 497
 498         if (!src || !dst)
 499                 return 0;
 500
 501         s_addr = (const struct sockaddr *)(src + 1);
 502         d_addr = (const struct sockaddr *)(dst + 1);
 503         if (s_addr->sa_family != d_addr->sa_family)
 504                 return 0;
 505         if (s_addr->sa_family != AF_INET
 506 #if IS_ENABLED(CONFIG_IPV6)
 507             && s_addr->sa_family != AF_INET6
 508 #endif
 509                 )
 510                 return 0;
 511
 512         return 1;
 513 }
 514
 515 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 516 {
 517         const char *p = (char *) hdr;
 518         int len = skb->len;
 519
 520         len -= sizeof(*hdr);
 521         p += sizeof(*hdr);
 522         while (len > 0) {
 523                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 524                 uint16_t ext_type;
 525                 int ext_len;
 526
 527                 if (len < sizeof(*ehdr))
 528                         return -EINVAL;
 529
 530                 ext_len  = ehdr->sadb_ext_len;
 531                 ext_len *= sizeof(uint64_t);
 532                 ext_type = ehdr->sadb_ext_type;
 533                 if (ext_len < sizeof(uint64_t) ||
 534                     ext_len > len ||
 535                     ext_type == SADB_EXT_RESERVED)
 536                         return -EINVAL;
 537
 538                 if (ext_type <= SADB_EXT_MAX) {
 539                         int min = (int) sadb_ext_min_len[ext_type];
 540                         if (ext_len < min)
 541                                 return -EINVAL;
 542                         if (ext_hdrs[ext_type-1] != NULL)
 543                                 return -EINVAL;
 544                         switch (ext_type) {
 545                         case SADB_EXT_ADDRESS_SRC:
 546                         case SADB_EXT_ADDRESS_DST:
 547                         case SADB_EXT_ADDRESS_PROXY:
 548                         case SADB_X_EXT_NAT_T_OA:
 549                                 if (verify_address_len(p))
 550                                         return -EINVAL;
 551                                 break;
 552                         case SADB_X_EXT_SEC_CTX:
 553                                 if (verify_sec_ctx_len(p))
 554                                         return -EINVAL;
 555                                 break;
 556                         case SADB_EXT_KEY_AUTH:
 557                         case SADB_EXT_KEY_ENCRYPT:
 558                                 if (verify_key_len(p))
 559                                         return -EINVAL;
 560                                 break;
 561                         default:
 562                                 break;
 563                         }
 564                         ext_hdrs[ext_type-1] = (void *) p;
 565                 }
 566                 p   += ext_len;
 567                 len -= ext_len;
 568         }
 569
 570         return 0;
 571 }
 572
 573 static uint16_t
 574 pfkey_satype2proto(uint8_t satype)
 575 {
 576         switch (satype) {
 577         case SADB_SATYPE_UNSPEC:
 578                 return IPSEC_PROTO_ANY;
 579         case SADB_SATYPE_AH:
 580                 return IPPROTO_AH;
 581         case SADB_SATYPE_ESP:
 582                 return IPPROTO_ESP;
 583         case SADB_X_SATYPE_IPCOMP:
 584                 return IPPROTO_COMP;
 585         default:
 586                 return 0;
 587         }
 588         /* NOTREACHED */
 589 }
 590
 591 static uint8_t
 592 pfkey_proto2satype(uint16_t proto)
 593 {
 594         switch (proto) {
 595         case IPPROTO_AH:
 596                 return SADB_SATYPE_AH;
 597         case IPPROTO_ESP:
 598                 return SADB_SATYPE_ESP;
 599         case IPPROTO_COMP:
 600                 return SADB_X_SATYPE_IPCOMP;
 601         default:
 602                 return 0;
 603         }
 604         /* NOTREACHED */
 605 }
 606
 607 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 608  * say specifically 'just raw sockets' as we encode them as 255.
 609  */
 610
 611 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 612 {
 613         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 614 }
 615
 616 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 617 {
 618         return proto ? proto : IPSEC_PROTO_ANY;
 619 }
 620
 621 static inline int pfkey_sockaddr_len(sa_family_t family)
 622 {
 623         switch (family) {
 624         case AF_INET:
 625                 return sizeof(struct sockaddr_in);
 626 #if IS_ENABLED(CONFIG_IPV6)
 627         case AF_INET6:
 628                 return sizeof(struct sockaddr_in6);
 629 #endif
 630         }
 631         return 0;
 632 }
 633
 634 static
 635 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 636 {
 637         switch (sa->sa_family) {
 638         case AF_INET:
 639                 xaddr->a4 =
 640                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 641                 return AF_INET;
 642 #if IS_ENABLED(CONFIG_IPV6)
 643         case AF_INET6:
 644                 memcpy(xaddr->a6,
 645                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 646                        sizeof(struct in6_addr));
 647                 return AF_INET6;
 648 #endif
 649         }
 650         return 0;
 651 }
 652
 653 static
 654 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 655 {
 656         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 657                                       xaddr);
 658 }
 659
 660 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 661 {
 662         const struct sadb_sa *sa;
 663         const struct sadb_address *addr;
 664         uint16_t proto;
 665         unsigned short family;
 666         xfrm_address_t *xaddr;
 667
 668         sa = ext_hdrs[SADB_EXT_SA - 1];
 669         if (sa == NULL)
 670                 return NULL;
 671
 672         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 673         if (proto == 0)
 674                 return NULL;
 675
 676         /* sadb_address_len should be checked by caller */
 677         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 678         if (addr == NULL)
 679                 return NULL;
 680
 681         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 682         switch (family) {
 683         case AF_INET:
 684                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 685                 break;
 686 #if IS_ENABLED(CONFIG_IPV6)
 687         case AF_INET6:
 688                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 689                 break;
 690 #endif
 691         default:
 692                 xaddr = NULL;
 693         }
 694
 695         if (!xaddr)
 696                 return NULL;
 697
 698         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 699 }
 700
 701 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 702
 703 static int
 704 pfkey_sockaddr_size(sa_family_t family)
 705 {
 706         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 707 }
 708
 709 static inline int pfkey_mode_from_xfrm(int mode)
 710 {
 711         switch(mode) {
 712         case XFRM_MODE_TRANSPORT:
 713                 return IPSEC_MODE_TRANSPORT;
 714         case XFRM_MODE_TUNNEL:
 715                 return IPSEC_MODE_TUNNEL;
 716         case XFRM_MODE_BEET:
 717                 return IPSEC_MODE_BEET;
 718         default:
 719                 return -1;
 720         }
 721 }
 722
 723 static inline int pfkey_mode_to_xfrm(int mode)
 724 {
 725         switch(mode) {
 726         case IPSEC_MODE_ANY:    /*XXX*/
 727         case IPSEC_MODE_TRANSPORT:
 728                 return XFRM_MODE_TRANSPORT;
 729         case IPSEC_MODE_TUNNEL:
 730                 return XFRM_MODE_TUNNEL;
 731         case IPSEC_MODE_BEET:
 732                 return XFRM_MODE_BEET;
 733         default:
 734                 return -1;
 735         }
 736 }
 737
 738 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 739                                         struct sockaddr *sa,
 740                                         unsigned short family)
 741 {
 742         switch (family) {
 743         case AF_INET:
 744             {
 745                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 746                 sin->sin_family = AF_INET;
 747                 sin->sin_port = port;
 748                 sin->sin_addr.s_addr = xaddr->a4;
 749                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 750                 return 32;
 751             }
 752 #if IS_ENABLED(CONFIG_IPV6)
 753         case AF_INET6:
 754             {
 755                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 756                 sin6->sin6_family = AF_INET6;
 757                 sin6->sin6_port = port;
 758                 sin6->sin6_flowinfo = 0;
 759                 sin6->sin6_addr = xaddr->in6;
 760                 sin6->sin6_scope_id = 0;
 761                 return 128;
 762             }
 763 #endif
 764         }
 765         return 0;
 766 }
 767
 768 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 769                                               int add_keys, int hsc)
 770 {
 771         struct sk_buff *skb;
 772         struct sadb_msg *hdr;
 773         struct sadb_sa *sa;
 774         struct sadb_lifetime *lifetime;
 775         struct sadb_address *addr;
 776         struct sadb_key *key;
 777         struct sadb_x_sa2 *sa2;
 778         struct sadb_x_sec_ctx *sec_ctx;
 779         struct xfrm_sec_ctx *xfrm_ctx;
 780         int ctx_size = 0;
 781         int size;
 782         int auth_key_size = 0;
 783         int encrypt_key_size = 0;
 784         int sockaddr_size;
 785         struct xfrm_encap_tmpl *natt = NULL;
 786         int mode;
 787
 788         /* address family check */
 789         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 790         if (!sockaddr_size)
 791                 return ERR_PTR(-EINVAL);
 792
 793         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 794            key(AE), (identity(SD),) (sensitivity)> */
 795         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 796                 sizeof(struct sadb_lifetime) +
 797                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 798                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 799                         sizeof(struct sadb_address)*2 +
 800                                 sockaddr_size*2 +
 801                                         sizeof(struct sadb_x_sa2);
 802
 803         if ((xfrm_ctx = x->security)) {
 804                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 805                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 806         }
 807
 808         /* identity & sensitivity */
 809         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 810                 size += sizeof(struct sadb_address) + sockaddr_size;
 811
 812         if (add_keys) {
 813                 if (x->aalg && x->aalg->alg_key_len) {
 814                         auth_key_size =
 815                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 816                         size += sizeof(struct sadb_key) + auth_key_size;
 817                 }
 818                 if (x->ealg && x->ealg->alg_key_len) {
 819                         encrypt_key_size =
 820                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 821                         size += sizeof(struct sadb_key) + encrypt_key_size;
 822                 }
 823         }
 824         if (x->encap)
 825                 natt = x->encap;
 826
 827         if (natt && natt->encap_type) {
 828                 size += sizeof(struct sadb_x_nat_t_type);
 829                 size += sizeof(struct sadb_x_nat_t_port);
 830                 size += sizeof(struct sadb_x_nat_t_port);
 831         }
 832
 833         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 834         if (skb == NULL)
 835                 return ERR_PTR(-ENOBUFS);
 836
 837         /* call should fill header later */
 838         hdr = skb_put(skb, sizeof(struct sadb_msg));
 839         memset(hdr, 0, size);   /* XXX do we need this ? */
 840         hdr->sadb_msg_len = size / sizeof(uint64_t);
 841
 842         /* sa */
 843         sa = skb_put(skb, sizeof(struct sadb_sa));
 844         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 845         sa->sadb_sa_exttype = SADB_EXT_SA;
 846         sa->sadb_sa_spi = x->id.spi;
 847         sa->sadb_sa_replay = x->props.replay_window;
 848         switch (x->km.state) {
 849         case XFRM_STATE_VALID:
 850                 sa->sadb_sa_state = x->km.dying ?
 851                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 852                 break;
 853         case XFRM_STATE_ACQ:
 854                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 855                 break;
 856         default:
 857                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 858                 break;
 859         }
 860         sa->sadb_sa_auth = 0;
 861         if (x->aalg) {
 862                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 863                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 864                                         a->desc.sadb_alg_id : 0;
 865         }
 866         sa->sadb_sa_encrypt = 0;
 867         BUG_ON(x->ealg && x->calg);
 868         if (x->ealg) {
 869                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 870                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 871                                         a->desc.sadb_alg_id : 0;
 872         }
 873         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 874         if (x->calg) {
 875                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 876                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 877                                         a->desc.sadb_alg_id : 0;
 878         }
 879
 880         sa->sadb_sa_flags = 0;
 881         if (x->props.flags & XFRM_STATE_NOECN)
 882                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 883         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 884                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 885         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 886                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 887
 888         /* hard time */
 889         if (hsc & 2) {
 890                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 891                 lifetime->sadb_lifetime_len =
 892                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 893                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 894                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 895                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 896                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 897                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 898         }
 899         /* soft time */
 900         if (hsc & 1) {
 901                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 902                 lifetime->sadb_lifetime_len =
 903                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 904                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 905                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 906                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 907                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 908                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 909         }
 910         /* current time */
 911         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 912         lifetime->sadb_lifetime_len =
 913                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 914         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 915         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 916         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 917         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 918         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 919         /* src address */
 920         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 921         addr->sadb_address_len =
 922                 (sizeof(struct sadb_address)+sockaddr_size)/
 923                         sizeof(uint64_t);
 924         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 925         /* "if the ports are non-zero, then the sadb_address_proto field,
 926            normally zero, MUST be filled in with the transport
 927            protocol's number." - RFC2367 */
 928         addr->sadb_address_proto = 0;
 929         addr->sadb_address_reserved = 0;
 930
 931         addr->sadb_address_prefixlen =
 932                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 933                                     (struct sockaddr *) (addr + 1),
 934                                     x->props.family);
 935         if (!addr->sadb_address_prefixlen)
 936                 BUG();
 937
 938         /* dst address */
 939         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 940         addr->sadb_address_len =
 941                 (sizeof(struct sadb_address)+sockaddr_size)/
 942                         sizeof(uint64_t);
 943         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 944         addr->sadb_address_proto = 0;
 945         addr->sadb_address_reserved = 0;
 946
 947         addr->sadb_address_prefixlen =
 948                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 949                                     (struct sockaddr *) (addr + 1),
 950                                     x->props.family);
 951         if (!addr->sadb_address_prefixlen)
 952                 BUG();
 953
 954         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 955                              x->props.family)) {
 956                 addr = skb_put(skb,
 957                                sizeof(struct sadb_address) + sockaddr_size);
 958                 addr->sadb_address_len =
 959                         (sizeof(struct sadb_address)+sockaddr_size)/
 960                         sizeof(uint64_t);
 961                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 962                 addr->sadb_address_proto =
 963                         pfkey_proto_from_xfrm(x->sel.proto);
 964                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 965                 addr->sadb_address_reserved = 0;
 966
 967                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 968                                     (struct sockaddr *) (addr + 1),
 969                                     x->props.family);
 970         }
 971
 972         /* auth key */
 973         if (add_keys && auth_key_size) {
 974                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 975                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 976                         sizeof(uint64_t);
 977                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 978                 key->sadb_key_bits = x->aalg->alg_key_len;
 979                 key->sadb_key_reserved = 0;
 980                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 981         }
 982         /* encrypt key */
 983         if (add_keys && encrypt_key_size) {
 984                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 985                 key->sadb_key_len = (sizeof(struct sadb_key) +
 986                                      encrypt_key_size) / sizeof(uint64_t);
 987                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 988                 key->sadb_key_bits = x->ealg->alg_key_len;
 989                 key->sadb_key_reserved = 0;
 990                 memcpy(key + 1, x->ealg->alg_key,
 991                        (x->ealg->alg_key_len+7)/8);
 992         }
 993
 994         /* sa */
 995         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 996         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 997         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 998         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 999                 kfree_skb(skb);
1000                 return ERR_PTR(-EINVAL);
1001         }
1002         sa2->sadb_x_sa2_mode = mode;
1003         sa2->sadb_x_sa2_reserved1 = 0;
1004         sa2->sadb_x_sa2_reserved2 = 0;
1005         sa2->sadb_x_sa2_sequence = 0;
1006         sa2->sadb_x_sa2_reqid = x->props.reqid;
1007
1008         if (natt && natt->encap_type) {
1009                 struct sadb_x_nat_t_type *n_type;
1010                 struct sadb_x_nat_t_port *n_port;
1011
1012                 /* type */
1013                 n_type = skb_put(skb, sizeof(*n_type));
1014                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1015                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1016                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1017                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1018                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1019                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1020
1021                 /* source port */
1022                 n_port = skb_put(skb, sizeof(*n_port));
1023                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1024                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1026                 n_port->sadb_x_nat_t_port_reserved = 0;
1027
1028                 /* dest port */
1029                 n_port = skb_put(skb, sizeof(*n_port));
1030                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1031                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1032                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1033                 n_port->sadb_x_nat_t_port_reserved = 0;
1034         }
1035
1036         /* security context */
1037         if (xfrm_ctx) {
1038                 sec_ctx = skb_put(skb,
1039                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1040                 sec_ctx->sadb_x_sec_len =
1041                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1042                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1043                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1044                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1045                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1046                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1047                        xfrm_ctx->ctx_len);
1048         }
1049
1050         return skb;
1051 }
1052
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1055 {
1056         struct sk_buff *skb;
1057
1058         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1059
1060         return skb;
1061 }
1062
1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1064                                                           int hsc)
1065 {
1066         return __pfkey_xfrm_state2msg(x, 0, hsc);
1067 }
1068
1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1070                                                 const struct sadb_msg *hdr,
1071                                                 void * const *ext_hdrs)
1072 {
1073         struct xfrm_state *x;
1074         const struct sadb_lifetime *lifetime;
1075         const struct sadb_sa *sa;
1076         const struct sadb_key *key;
1077         const struct sadb_x_sec_ctx *sec_ctx;
1078         uint16_t proto;
1079         int err;
1080
1081
1082         sa = ext_hdrs[SADB_EXT_SA - 1];
1083         if (!sa ||
1084             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1085                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1086                 return ERR_PTR(-EINVAL);
1087         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1088             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1089                 return ERR_PTR(-EINVAL);
1090         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1091             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1092                 return ERR_PTR(-EINVAL);
1093         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1094             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1095                 return ERR_PTR(-EINVAL);
1096
1097         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1098         if (proto == 0)
1099                 return ERR_PTR(-EINVAL);
1100
1101         /* default error is no buffer space */
1102         err = -ENOBUFS;
1103
1104         /* RFC2367:
1105
1106    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1107    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1108    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1109    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1110    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1111    not true.
1112
1113            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1114            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1115          */
1116         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1117             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1118              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1119             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1120                 return ERR_PTR(-EINVAL);
1121         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1122         if (key != NULL &&
1123             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1124             key->sadb_key_bits == 0)
1125                 return ERR_PTR(-EINVAL);
1126         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1127         if (key != NULL &&
1128             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1129             key->sadb_key_bits == 0)
1130                 return ERR_PTR(-EINVAL);
1131
1132         x = xfrm_state_alloc(net);
1133         if (x == NULL)
1134                 return ERR_PTR(-ENOBUFS);
1135
1136         x->id.proto = proto;
1137         x->id.spi = sa->sadb_sa_spi;
1138         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1139                                         (sizeof(x->replay.bitmap) * 8));
1140         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1141                 x->props.flags |= XFRM_STATE_NOECN;
1142         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1143                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1144         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1145                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1146
1147         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1148         if (lifetime != NULL) {
1149                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1150                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1151                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1152                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1153         }
1154         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1155         if (lifetime != NULL) {
1156                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1157                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1158                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1159                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1160         }
1161
1162         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1163         if (sec_ctx != NULL) {
1164                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1165
1166                 if (!uctx)
1167                         goto out;
1168
1169                 err = security_xfrm_state_alloc(x, uctx);
1170                 kfree(uctx);
1171
1172                 if (err)
1173                         goto out;
1174         }
1175
1176         err = -ENOBUFS;
1177         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1178         if (sa->sadb_sa_auth) {
1179                 int keysize = 0;
1180                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1181                 if (!a || !a->pfkey_supported) {
1182                         err = -ENOSYS;
1183                         goto out;
1184                 }
1185                 if (key)
1186                         keysize = (key->sadb_key_bits + 7) / 8;
1187                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1188                 if (!x->aalg) {
1189                         err = -ENOMEM;
1190                         goto out;
1191                 }
1192                 strcpy(x->aalg->alg_name, a->name);
1193                 x->aalg->alg_key_len = 0;
1194                 if (key) {
1195                         x->aalg->alg_key_len = key->sadb_key_bits;
1196                         memcpy(x->aalg->alg_key, key+1, keysize);
1197                 }
1198                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1199                 x->props.aalgo = sa->sadb_sa_auth;
1200                 /* x->algo.flags = sa->sadb_sa_flags; */
1201         }
1202         if (sa->sadb_sa_encrypt) {
1203                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1204                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1205                         if (!a || !a->pfkey_supported) {
1206                                 err = -ENOSYS;
1207                                 goto out;
1208                         }
1209                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1210                         if (!x->calg) {
1211                                 err = -ENOMEM;
1212                                 goto out;
1213                         }
1214                         strcpy(x->calg->alg_name, a->name);
1215                         x->props.calgo = sa->sadb_sa_encrypt;
1216                 } else {
1217                         int keysize = 0;
1218                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1219                         if (!a || !a->pfkey_supported) {
1220                                 err = -ENOSYS;
1221                                 goto out;
1222                         }
1223                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1224                         if (key)
1225                                 keysize = (key->sadb_key_bits + 7) / 8;
1226                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1227                         if (!x->ealg) {
1228                                 err = -ENOMEM;
1229                                 goto out;
1230                         }
1231                         strcpy(x->ealg->alg_name, a->name);
1232                         x->ealg->alg_key_len = 0;
1233                         if (key) {
1234                                 x->ealg->alg_key_len = key->sadb_key_bits;
1235                                 memcpy(x->ealg->alg_key, key+1, keysize);
1236                         }
1237                         x->props.ealgo = sa->sadb_sa_encrypt;
1238                         x->geniv = a->uinfo.encr.geniv;
1239                 }
1240         }
1241         /* x->algo.flags = sa->sadb_sa_flags; */
1242
1243         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1244                                                     &x->props.saddr);
1245         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1246                                   &x->id.daddr);
1247
1248         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1249                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1250                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1251                 if (mode < 0) {
1252                         err = -EINVAL;
1253                         goto out;
1254                 }
1255                 x->props.mode = mode;
1256                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1257         }
1258
1259         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1260                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1261
1262                 /* Nobody uses this, but we try. */
1263                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1264                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1265         }
1266
1267         if (!x->sel.family)
1268                 x->sel.family = x->props.family;
1269
1270         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1271                 const struct sadb_x_nat_t_type* n_type;
1272                 struct xfrm_encap_tmpl *natt;
1273
1274                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1275                 if (!x->encap) {
1276                         err = -ENOMEM;
1277                         goto out;
1278                 }
1279
1280                 natt = x->encap;
1281                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1282                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1283
1284                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1285                         const struct sadb_x_nat_t_port *n_port =
1286                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1287                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1288                 }
1289                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1290                         const struct sadb_x_nat_t_port *n_port =
1291                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1292                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1293                 }
1294                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1295         }
1296
1297         err = xfrm_init_state(x);
1298         if (err)
1299                 goto out;
1300
1301         x->km.seq = hdr->sadb_msg_seq;
1302         return x;
1303
1304 out:
1305         x->km.state = XFRM_STATE_DEAD;
1306         xfrm_state_put(x);
1307         return ERR_PTR(err);
1308 }
1309
1310 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1311 {
1312         return -EOPNOTSUPP;
1313 }
1314
1315 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1316 {
1317         struct net *net = sock_net(sk);
1318         struct sk_buff *resp_skb;
1319         struct sadb_x_sa2 *sa2;
1320         struct sadb_address *saddr, *daddr;
1321         struct sadb_msg *out_hdr;
1322         struct sadb_spirange *range;
1323         struct xfrm_state *x = NULL;
1324         int mode;
1325         int err;
1326         u32 min_spi, max_spi;
1327         u32 reqid;
1328         u8 proto;
1329         unsigned short family;
1330         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1331
1332         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1333                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1334                 return -EINVAL;
1335
1336         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1337         if (proto == 0)
1338                 return -EINVAL;
1339
1340         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1341                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1342                 if (mode < 0)
1343                         return -EINVAL;
1344                 reqid = sa2->sadb_x_sa2_reqid;
1345         } else {
1346                 mode = 0;
1347                 reqid = 0;
1348         }
1349
1350         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1351         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1352
1353         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1354         switch (family) {
1355         case AF_INET:
1356                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1357                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1358                 break;
1359 #if IS_ENABLED(CONFIG_IPV6)
1360         case AF_INET6:
1361                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1362                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1363                 break;
1364 #endif
1365         }
1366
1367         if (hdr->sadb_msg_seq) {
1368                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1369                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1370                         xfrm_state_put(x);
1371                         x = NULL;
1372                 }
1373         }
1374
1375         if (!x)
1376                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1377
1378         if (x == NULL)
1379                 return -ENOENT;
1380
1381         min_spi = 0x100;
1382         max_spi = 0x0fffffff;
1383
1384         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1385         if (range) {
1386                 min_spi = range->sadb_spirange_min;
1387                 max_spi = range->sadb_spirange_max;
1388         }
1389
1390         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1391         if (err) {
1392                 xfrm_state_put(x);
1393                 return err;
1394         }
1395
1396         err = xfrm_alloc_spi(x, min_spi, max_spi);
1397         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1398
1399         if (IS_ERR(resp_skb)) {
1400                 xfrm_state_put(x);
1401                 return  PTR_ERR(resp_skb);
1402         }
1403
1404         out_hdr = (struct sadb_msg *) resp_skb->data;
1405         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1406         out_hdr->sadb_msg_type = SADB_GETSPI;
1407         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1408         out_hdr->sadb_msg_errno = 0;
1409         out_hdr->sadb_msg_reserved = 0;
1410         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1411         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1412
1413         xfrm_state_put(x);
1414
1415         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1416
1417         return 0;
1418 }
1419
1420 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1421 {
1422         struct net *net = sock_net(sk);
1423         struct xfrm_state *x;
1424
1425         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1426                 return -EOPNOTSUPP;
1427
1428         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1429                 return 0;
1430
1431         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1432         if (x == NULL)
1433                 return 0;
1434
1435         spin_lock_bh(&x->lock);
1436         if (x->km.state == XFRM_STATE_ACQ)
1437                 x->km.state = XFRM_STATE_ERROR;
1438
1439         spin_unlock_bh(&x->lock);
1440         xfrm_state_put(x);
1441         return 0;
1442 }
1443
1444 static inline int event2poltype(int event)
1445 {
1446         switch (event) {
1447         case XFRM_MSG_DELPOLICY:
1448                 return SADB_X_SPDDELETE;
1449         case XFRM_MSG_NEWPOLICY:
1450                 return SADB_X_SPDADD;
1451         case XFRM_MSG_UPDPOLICY:
1452                 return SADB_X_SPDUPDATE;
1453         case XFRM_MSG_POLEXPIRE:
1454         //      return SADB_X_SPDEXPIRE;
1455         default:
1456                 pr_err("pfkey: Unknown policy event %d\n", event);
1457                 break;
1458         }
1459
1460         return 0;
1461 }
1462
1463 static inline int event2keytype(int event)
1464 {
1465         switch (event) {
1466         case XFRM_MSG_DELSA:
1467                 return SADB_DELETE;
1468         case XFRM_MSG_NEWSA:
1469                 return SADB_ADD;
1470         case XFRM_MSG_UPDSA:
1471                 return SADB_UPDATE;
1472         case XFRM_MSG_EXPIRE:
1473                 return SADB_EXPIRE;
1474         default:
1475                 pr_err("pfkey: Unknown SA event %d\n", event);
1476                 break;
1477         }
1478
1479         return 0;
1480 }
1481
1482 /* ADD/UPD/DEL */
1483 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1484 {
1485         struct sk_buff *skb;
1486         struct sadb_msg *hdr;
1487
1488         skb = pfkey_xfrm_state2msg(x);
1489
1490         if (IS_ERR(skb))
1491                 return PTR_ERR(skb);
1492
1493         hdr = (struct sadb_msg *) skb->data;
1494         hdr->sadb_msg_version = PF_KEY_V2;
1495         hdr->sadb_msg_type = event2keytype(c->event);
1496         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1497         hdr->sadb_msg_errno = 0;
1498         hdr->sadb_msg_reserved = 0;
1499         hdr->sadb_msg_seq = c->seq;
1500         hdr->sadb_msg_pid = c->portid;
1501
1502         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1503
1504         return 0;
1505 }
1506
1507 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1508 {
1509         struct net *net = sock_net(sk);
1510         struct xfrm_state *x;
1511         int err;
1512         struct km_event c;
1513
1514         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1515         if (IS_ERR(x))
1516                 return PTR_ERR(x);
1517
1518         xfrm_state_hold(x);
1519         if (hdr->sadb_msg_type == SADB_ADD)
1520                 err = xfrm_state_add(x);
1521         else
1522                 err = xfrm_state_update(x);
1523
1524         xfrm_audit_state_add(x, err ? 0 : 1, true);
1525
1526         if (err < 0) {
1527                 x->km.state = XFRM_STATE_DEAD;
1528                 __xfrm_state_put(x);
1529                 goto out;
1530         }
1531
1532         if (hdr->sadb_msg_type == SADB_ADD)
1533                 c.event = XFRM_MSG_NEWSA;
1534         else
1535                 c.event = XFRM_MSG_UPDSA;
1536         c.seq = hdr->sadb_msg_seq;
1537         c.portid = hdr->sadb_msg_pid;
1538         km_state_notify(x, &c);
1539 out:
1540         xfrm_state_put(x);
1541         return err;
1542 }
1543
1544 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1545 {
1546         struct net *net = sock_net(sk);
1547         struct xfrm_state *x;
1548         struct km_event c;
1549         int err;
1550
1551         if (!ext_hdrs[SADB_EXT_SA-1] ||
1552             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1553                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1554                 return -EINVAL;
1555
1556         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1557         if (x == NULL)
1558                 return -ESRCH;
1559
1560         if ((err = security_xfrm_state_delete(x)))
1561                 goto out;
1562
1563         if (xfrm_state_kern(x)) {
1564                 err = -EPERM;
1565                 goto out;
1566         }
1567
1568         err = xfrm_state_delete(x);
1569
1570         if (err < 0)
1571                 goto out;
1572
1573         c.seq = hdr->sadb_msg_seq;
1574         c.portid = hdr->sadb_msg_pid;
1575         c.event = XFRM_MSG_DELSA;
1576         km_state_notify(x, &c);
1577 out:
1578         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1579         xfrm_state_put(x);
1580
1581         return err;
1582 }
1583
1584 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1585 {
1586         struct net *net = sock_net(sk);
1587         __u8 proto;
1588         struct sk_buff *out_skb;
1589         struct sadb_msg *out_hdr;
1590         struct xfrm_state *x;
1591
1592         if (!ext_hdrs[SADB_EXT_SA-1] ||
1593             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1594                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1595                 return -EINVAL;
1596
1597         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1598         if (x == NULL)
1599                 return -ESRCH;
1600
1601         out_skb = pfkey_xfrm_state2msg(x);
1602         proto = x->id.proto;
1603         xfrm_state_put(x);
1604         if (IS_ERR(out_skb))
1605                 return  PTR_ERR(out_skb);
1606
1607         out_hdr = (struct sadb_msg *) out_skb->data;
1608         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1609         out_hdr->sadb_msg_type = SADB_GET;
1610         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1611         out_hdr->sadb_msg_errno = 0;
1612         out_hdr->sadb_msg_reserved = 0;
1613         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1614         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1615         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1616
1617         return 0;
1618 }
1619
1620 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1621                                               gfp_t allocation)
1622 {
1623         struct sk_buff *skb;
1624         struct sadb_msg *hdr;
1625         int len, auth_len, enc_len, i;
1626
1627         auth_len = xfrm_count_pfkey_auth_supported();
1628         if (auth_len) {
1629                 auth_len *= sizeof(struct sadb_alg);
1630                 auth_len += sizeof(struct sadb_supported);
1631         }
1632
1633         enc_len = xfrm_count_pfkey_enc_supported();
1634         if (enc_len) {
1635                 enc_len *= sizeof(struct sadb_alg);
1636                 enc_len += sizeof(struct sadb_supported);
1637         }
1638
1639         len = enc_len + auth_len + sizeof(struct sadb_msg);
1640
1641         skb = alloc_skb(len + 16, allocation);
1642         if (!skb)
1643                 goto out_put_algs;
1644
1645         hdr = skb_put(skb, sizeof(*hdr));
1646         pfkey_hdr_dup(hdr, orig);
1647         hdr->sadb_msg_errno = 0;
1648         hdr->sadb_msg_len = len / sizeof(uint64_t);
1649
1650         if (auth_len) {
1651                 struct sadb_supported *sp;
1652                 struct sadb_alg *ap;
1653
1654                 sp = skb_put(skb, auth_len);
1655                 ap = (struct sadb_alg *) (sp + 1);
1656
1657                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1658                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1659
1660                 for (i = 0; ; i++) {
1661                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1662                         if (!aalg)
1663                                 break;
1664                         if (!aalg->pfkey_supported)
1665                                 continue;
1666                         if (aalg->available)
1667                                 *ap++ = aalg->desc;
1668                 }
1669         }
1670
1671         if (enc_len) {
1672                 struct sadb_supported *sp;
1673                 struct sadb_alg *ap;
1674
1675                 sp = skb_put(skb, enc_len);
1676                 ap = (struct sadb_alg *) (sp + 1);
1677
1678                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1679                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1680
1681                 for (i = 0; ; i++) {
1682                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1683                         if (!ealg)
1684                                 break;
1685                         if (!ealg->pfkey_supported)
1686                                 continue;
1687                         if (ealg->available)
1688                                 *ap++ = ealg->desc;
1689                 }
1690         }
1691
1692 out_put_algs:
1693         return skb;
1694 }
1695
1696 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1697 {
1698         struct pfkey_sock *pfk = pfkey_sk(sk);
1699         struct sk_buff *supp_skb;
1700
1701         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1702                 return -EINVAL;
1703
1704         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1705                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1706                         return -EEXIST;
1707                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1708         }
1709
1710         xfrm_probe_algs();
1711
1712         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1713         if (!supp_skb) {
1714                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1715                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1716
1717                 return -ENOBUFS;
1718         }
1719
1720         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1721                         sock_net(sk));
1722         return 0;
1723 }
1724
1725 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1726 {
1727         struct sk_buff *skb;
1728         struct sadb_msg *hdr;
1729
1730         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1731         if (!skb)
1732                 return -ENOBUFS;
1733
1734         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1735         hdr->sadb_msg_errno = (uint8_t) 0;
1736         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1737
1738         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1739                                sock_net(sk));
1740 }
1741
1742 static int key_notify_sa_flush(const struct km_event *c)
1743 {
1744         struct sk_buff *skb;
1745         struct sadb_msg *hdr;
1746
1747         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1748         if (!skb)
1749                 return -ENOBUFS;
1750         hdr = skb_put(skb, sizeof(struct sadb_msg));
1751         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1752         hdr->sadb_msg_type = SADB_FLUSH;
1753         hdr->sadb_msg_seq = c->seq;
1754         hdr->sadb_msg_pid = c->portid;
1755         hdr->sadb_msg_version = PF_KEY_V2;
1756         hdr->sadb_msg_errno = (uint8_t) 0;
1757         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1758         hdr->sadb_msg_reserved = 0;
1759
1760         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1761
1762         return 0;
1763 }
1764
1765 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1766 {
1767         struct net *net = sock_net(sk);
1768         unsigned int proto;
1769         struct km_event c;
1770         int err, err2;
1771
1772         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1773         if (proto == 0)
1774                 return -EINVAL;
1775
1776         err = xfrm_state_flush(net, proto, true, false);
1777         err2 = unicast_flush_resp(sk, hdr);
1778         if (err || err2) {
1779                 if (err == -ESRCH) /* empty table - go quietly */
1780                         err = 0;
1781                 return err ? err : err2;
1782         }
1783
1784         c.data.proto = proto;
1785         c.seq = hdr->sadb_msg_seq;
1786         c.portid = hdr->sadb_msg_pid;
1787         c.event = XFRM_MSG_FLUSHSA;
1788         c.net = net;
1789         km_state_notify(NULL, &c);
1790
1791         return 0;
1792 }
1793
1794 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1795 {
1796         struct pfkey_sock *pfk = ptr;
1797         struct sk_buff *out_skb;
1798         struct sadb_msg *out_hdr;
1799
1800         if (!pfkey_can_dump(&pfk->sk))
1801                 return -ENOBUFS;
1802
1803         out_skb = pfkey_xfrm_state2msg(x);
1804         if (IS_ERR(out_skb))
1805                 return PTR_ERR(out_skb);
1806
1807         out_hdr = (struct sadb_msg *) out_skb->data;
1808         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1809         out_hdr->sadb_msg_type = SADB_DUMP;
1810         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1811         out_hdr->sadb_msg_errno = 0;
1812         out_hdr->sadb_msg_reserved = 0;
1813         out_hdr->sadb_msg_seq = count + 1;
1814         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1815
1816         if (pfk->dump.skb)
1817                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1818                                 &pfk->sk, sock_net(&pfk->sk));
1819         pfk->dump.skb = out_skb;
1820
1821         return 0;
1822 }
1823
1824 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1825 {
1826         struct net *net = sock_net(&pfk->sk);
1827         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1828 }
1829
1830 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1831 {
1832         struct net *net = sock_net(&pfk->sk);
1833
1834         xfrm_state_walk_done(&pfk->dump.u.state, net);
1835 }
1836
1837 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1838 {
1839         u8 proto;
1840         struct xfrm_address_filter *filter = NULL;
1841         struct pfkey_sock *pfk = pfkey_sk(sk);
1842
1843         mutex_lock(&pfk->dump_lock);
1844         if (pfk->dump.dump != NULL) {
1845                 mutex_unlock(&pfk->dump_lock);
1846                 return -EBUSY;
1847         }
1848
1849         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1850         if (proto == 0) {
1851                 mutex_unlock(&pfk->dump_lock);
1852                 return -EINVAL;
1853         }
1854
1855         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1856                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1857
1858                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1859                 if (filter == NULL) {
1860                         mutex_unlock(&pfk->dump_lock);
1861                         return -ENOMEM;
1862                 }
1863
1864                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1865                        sizeof(xfrm_address_t));
1866                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1867                        sizeof(xfrm_address_t));
1868                 filter->family = xfilter->sadb_x_filter_family;
1869                 filter->splen = xfilter->sadb_x_filter_splen;
1870                 filter->dplen = xfilter->sadb_x_filter_dplen;
1871         }
1872
1873         pfk->dump.msg_version = hdr->sadb_msg_version;
1874         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1875         pfk->dump.dump = pfkey_dump_sa;
1876         pfk->dump.done = pfkey_dump_sa_done;
1877         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1878         mutex_unlock(&pfk->dump_lock);
1879
1880         return pfkey_do_dump(pfk);
1881 }
1882
1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1884 {
1885         struct pfkey_sock *pfk = pfkey_sk(sk);
1886         int satype = hdr->sadb_msg_satype;
1887         bool reset_errno = false;
1888
1889         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1890                 reset_errno = true;
1891                 if (satype != 0 && satype != 1)
1892                         return -EINVAL;
1893                 pfk->promisc = satype;
1894         }
1895         if (reset_errno && skb_cloned(skb))
1896                 skb = skb_copy(skb, GFP_KERNEL);
1897         else
1898                 skb = skb_clone(skb, GFP_KERNEL);
1899
1900         if (reset_errno && skb) {
1901                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1902                 new_hdr->sadb_msg_errno = 0;
1903         }
1904
1905         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1906         return 0;
1907 }
1908
1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1910 {
1911         int i;
1912         u32 reqid = *(u32*)ptr;
1913
1914         for (i=0; i<xp->xfrm_nr; i++) {
1915                 if (xp->xfrm_vec[i].reqid == reqid)
1916                         return -EEXIST;
1917         }
1918         return 0;
1919 }
1920
1921 static u32 gen_reqid(struct net *net)
1922 {
1923         struct xfrm_policy_walk walk;
1924         u32 start;
1925         int rc;
1926         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1927
1928         start = reqid;
1929         do {
1930                 ++reqid;
1931                 if (reqid == 0)
1932                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1933                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1934                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1935                 xfrm_policy_walk_done(&walk, net);
1936                 if (rc != -EEXIST)
1937                         return reqid;
1938         } while (reqid != start);
1939         return 0;
1940 }
1941
1942 static int
1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1944 {
1945         struct net *net = xp_net(xp);
1946         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947         int mode;
1948
1949         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950                 return -ELOOP;
1951
1952         if (rq->sadb_x_ipsecrequest_mode == 0)
1953                 return -EINVAL;
1954         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955                 return -EINVAL;
1956
1957         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959                 return -EINVAL;
1960         t->mode = mode;
1961         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1962                 t->optional = 1;
1963         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1964                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1965                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1966                         t->reqid = 0;
1967                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1968                         return -ENOBUFS;
1969         }
1970
1971         /* addresses present only in tunnel mode */
1972         if (t->mode == XFRM_MODE_TUNNEL) {
1973                 int err;
1974
1975                 err = parse_sockaddr_pair(
1976                         (struct sockaddr *)(rq + 1),
1977                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1978                         &t->saddr, &t->id.daddr, &t->encap_family);
1979                 if (err)
1980                         return err;
1981         } else
1982                 t->encap_family = xp->family;
1983
1984         /* No way to set this via kame pfkey */
1985         t->allalgs = 1;
1986         xp->xfrm_nr++;
1987         return 0;
1988 }
1989
1990 static int
1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1992 {
1993         int err;
1994         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1995         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1996
1997         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1998                 return -EINVAL;
1999
2000         while (len >= sizeof(*rq)) {
2001                 if (len < rq->sadb_x_ipsecrequest_len ||
2002                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2003                         return -EINVAL;
2004
2005                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2006                         return err;
2007                 len -= rq->sadb_x_ipsecrequest_len;
2008                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2009         }
2010         return 0;
2011 }
2012
2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2014 {
2015         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2016
2017         if (xfrm_ctx) {
2018                 int len = sizeof(struct sadb_x_sec_ctx);
2019                 len += xfrm_ctx->ctx_len;
2020                 return PFKEY_ALIGN8(len);
2021         }
2022         return 0;
2023 }
2024
2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2026 {
2027         const struct xfrm_tmpl *t;
2028         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2029         int socklen = 0;
2030         int i;
2031
2032         for (i=0; i<xp->xfrm_nr; i++) {
2033                 t = xp->xfrm_vec + i;
2034                 socklen += pfkey_sockaddr_len(t->encap_family);
2035         }
2036
2037         return sizeof(struct sadb_msg) +
2038                 (sizeof(struct sadb_lifetime) * 3) +
2039                 (sizeof(struct sadb_address) * 2) +
2040                 (sockaddr_size * 2) +
2041                 sizeof(struct sadb_x_policy) +
2042                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2043                 (socklen * 2) +
2044                 pfkey_xfrm_policy2sec_ctx_size(xp);
2045 }
2046
2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2048 {
2049         struct sk_buff *skb;
2050         int size;
2051
2052         size = pfkey_xfrm_policy2msg_size(xp);
2053
2054         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2055         if (skb == NULL)
2056                 return ERR_PTR(-ENOBUFS);
2057
2058         return skb;
2059 }
2060
2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2062 {
2063         struct sadb_msg *hdr;
2064         struct sadb_address *addr;
2065         struct sadb_lifetime *lifetime;
2066         struct sadb_x_policy *pol;
2067         struct sadb_x_sec_ctx *sec_ctx;
2068         struct xfrm_sec_ctx *xfrm_ctx;
2069         int i;
2070         int size;
2071         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2072         int socklen = pfkey_sockaddr_len(xp->family);
2073
2074         size = pfkey_xfrm_policy2msg_size(xp);
2075
2076         /* call should fill header later */
2077         hdr = skb_put(skb, sizeof(struct sadb_msg));
2078         memset(hdr, 0, size);   /* XXX do we need this ? */
2079
2080         /* src address */
2081         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2082         addr->sadb_address_len =
2083                 (sizeof(struct sadb_address)+sockaddr_size)/
2084                         sizeof(uint64_t);
2085         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2086         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2087         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2088         addr->sadb_address_reserved = 0;
2089         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2090                                  xp->selector.sport,
2091                                  (struct sockaddr *) (addr + 1),
2092                                  xp->family))
2093                 BUG();
2094
2095         /* dst address */
2096         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2097         addr->sadb_address_len =
2098                 (sizeof(struct sadb_address)+sockaddr_size)/
2099                         sizeof(uint64_t);
2100         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2101         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2102         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2103         addr->sadb_address_reserved = 0;
2104
2105         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2106                             (struct sockaddr *) (addr + 1),
2107                             xp->family);
2108
2109         /* hard time */
2110         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2111         lifetime->sadb_lifetime_len =
2112                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2113         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2114         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2115         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2116         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2117         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2118         /* soft time */
2119         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2120         lifetime->sadb_lifetime_len =
2121                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2122         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2123         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2124         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2125         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2126         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2127         /* current time */
2128         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2129         lifetime->sadb_lifetime_len =
2130                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2131         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2132         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2133         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2134         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2135         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2136
2137         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2138         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2139         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2140         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2141         if (xp->action == XFRM_POLICY_ALLOW) {
2142                 if (xp->xfrm_nr)
2143                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2144                 else
2145                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2146         }
2147         pol->sadb_x_policy_dir = dir+1;
2148         pol->sadb_x_policy_reserved = 0;
2149         pol->sadb_x_policy_id = xp->index;
2150         pol->sadb_x_policy_priority = xp->priority;
2151
2152         for (i=0; i<xp->xfrm_nr; i++) {
2153                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2154                 struct sadb_x_ipsecrequest *rq;
2155                 int req_size;
2156                 int mode;
2157
2158                 req_size = sizeof(struct sadb_x_ipsecrequest);
2159                 if (t->mode == XFRM_MODE_TUNNEL) {
2160                         socklen = pfkey_sockaddr_len(t->encap_family);
2161                         req_size += socklen * 2;
2162                 } else {
2163                         size -= 2*socklen;
2164                 }
2165                 rq = skb_put(skb, req_size);
2166                 pol->sadb_x_policy_len += req_size/8;
2167                 memset(rq, 0, sizeof(*rq));
2168                 rq->sadb_x_ipsecrequest_len = req_size;
2169                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2170                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2171                         return -EINVAL;
2172                 rq->sadb_x_ipsecrequest_mode = mode;
2173                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2174                 if (t->reqid)
2175                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2176                 if (t->optional)
2177                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2178                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2179
2180                 if (t->mode == XFRM_MODE_TUNNEL) {
2181                         u8 *sa = (void *)(rq + 1);
2182                         pfkey_sockaddr_fill(&t->saddr, 0,
2183                                             (struct sockaddr *)sa,
2184                                             t->encap_family);
2185                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2186                                             (struct sockaddr *) (sa + socklen),
2187                                             t->encap_family);
2188                 }
2189         }
2190
2191         /* security context */
2192         if ((xfrm_ctx = xp->security)) {
2193                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2194
2195                 sec_ctx = skb_put(skb, ctx_size);
2196                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2197                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2198                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2199                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2200                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2201                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2202                        xfrm_ctx->ctx_len);
2203         }
2204
2205         hdr->sadb_msg_len = size / sizeof(uint64_t);
2206         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2207
2208         return 0;
2209 }
2210
2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2212 {
2213         struct sk_buff *out_skb;
2214         struct sadb_msg *out_hdr;
2215         int err;
2216
2217         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2218         if (IS_ERR(out_skb))
2219                 return PTR_ERR(out_skb);
2220
2221         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2222         if (err < 0) {
2223                 kfree_skb(out_skb);
2224                 return err;
2225         }
2226
2227         out_hdr = (struct sadb_msg *) out_skb->data;
2228         out_hdr->sadb_msg_version = PF_KEY_V2;
2229
2230         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2231                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2232         else
2233                 out_hdr->sadb_msg_type = event2poltype(c->event);
2234         out_hdr->sadb_msg_errno = 0;
2235         out_hdr->sadb_msg_seq = c->seq;
2236         out_hdr->sadb_msg_pid = c->portid;
2237         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2238         return 0;
2239
2240 }
2241
2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2243 {
2244         struct net *net = sock_net(sk);
2245         int err = 0;
2246         struct sadb_lifetime *lifetime;
2247         struct sadb_address *sa;
2248         struct sadb_x_policy *pol;
2249         struct xfrm_policy *xp;
2250         struct km_event c;
2251         struct sadb_x_sec_ctx *sec_ctx;
2252
2253         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2254                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2255             !ext_hdrs[SADB_X_EXT_POLICY-1])
2256                 return -EINVAL;
2257
2258         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2259         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2260                 return -EINVAL;
2261         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2262                 return -EINVAL;
2263
2264         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2265         if (xp == NULL)
2266                 return -ENOBUFS;
2267
2268         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2269                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2270         xp->priority = pol->sadb_x_policy_priority;
2271
2272         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2273         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2274         xp->selector.family = xp->family;
2275         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2276         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2277         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2278         if (xp->selector.sport)
2279                 xp->selector.sport_mask = htons(0xffff);
2280
2281         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2282         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2283         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2284
2285         /* Amusing, we set this twice.  KAME apps appear to set same value
2286          * in both addresses.
2287          */
2288         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2289
2290         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2291         if (xp->selector.dport)
2292                 xp->selector.dport_mask = htons(0xffff);
2293
2294         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2295         if (sec_ctx != NULL) {
2296                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2297
2298                 if (!uctx) {
2299                         err = -ENOBUFS;
2300                         goto out;
2301                 }
2302
2303                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2304                 kfree(uctx);
2305
2306                 if (err)
2307                         goto out;
2308         }
2309
2310         xp->lft.soft_byte_limit = XFRM_INF;
2311         xp->lft.hard_byte_limit = XFRM_INF;
2312         xp->lft.soft_packet_limit = XFRM_INF;
2313         xp->lft.hard_packet_limit = XFRM_INF;
2314         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2315                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2316                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2317                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2318                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2319         }
2320         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2321                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2322                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2323                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2324                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2325         }
2326         xp->xfrm_nr = 0;
2327         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2328             (err = parse_ipsecrequests(xp, pol)) < 0)
2329                 goto out;
2330
2331         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2332                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2333
2334         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2335
2336         if (err)
2337                 goto out;
2338
2339         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2340                 c.event = XFRM_MSG_UPDPOLICY;
2341         else
2342                 c.event = XFRM_MSG_NEWPOLICY;
2343
2344         c.seq = hdr->sadb_msg_seq;
2345         c.portid = hdr->sadb_msg_pid;
2346
2347         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2348         xfrm_pol_put(xp);
2349         return 0;
2350
2351 out:
2352         xp->walk.dead = 1;
2353         xfrm_policy_destroy(xp);
2354         return err;
2355 }
2356
2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2358 {
2359         struct net *net = sock_net(sk);
2360         int err;
2361         struct sadb_address *sa;
2362         struct sadb_x_policy *pol;
2363         struct xfrm_policy *xp;
2364         struct xfrm_selector sel;
2365         struct km_event c;
2366         struct sadb_x_sec_ctx *sec_ctx;
2367         struct xfrm_sec_ctx *pol_ctx = NULL;
2368
2369         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2370                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2371             !ext_hdrs[SADB_X_EXT_POLICY-1])
2372                 return -EINVAL;
2373
2374         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2375         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2376                 return -EINVAL;
2377
2378         memset(&sel, 0, sizeof(sel));
2379
2380         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2381         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2382         sel.prefixlen_s = sa->sadb_address_prefixlen;
2383         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2384         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2385         if (sel.sport)
2386                 sel.sport_mask = htons(0xffff);
2387
2388         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2389         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2390         sel.prefixlen_d = sa->sadb_address_prefixlen;
2391         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393         if (sel.dport)
2394                 sel.dport_mask = htons(0xffff);
2395
2396         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2397         if (sec_ctx != NULL) {
2398                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2399
2400                 if (!uctx)
2401                         return -ENOMEM;
2402
2403                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2404                 kfree(uctx);
2405                 if (err)
2406                         return err;
2407         }
2408
2409         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2410                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2411                                    1, &err);
2412         security_xfrm_policy_free(pol_ctx);
2413         if (xp == NULL)
2414                 return -ENOENT;
2415
2416         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2417
2418         if (err)
2419                 goto out;
2420
2421         c.seq = hdr->sadb_msg_seq;
2422         c.portid = hdr->sadb_msg_pid;
2423         c.data.byid = 0;
2424         c.event = XFRM_MSG_DELPOLICY;
2425         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2426
2427 out:
2428         xfrm_pol_put(xp);
2429         return err;
2430 }
2431
2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2433 {
2434         int err;
2435         struct sk_buff *out_skb;
2436         struct sadb_msg *out_hdr;
2437         err = 0;
2438
2439         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2440         if (IS_ERR(out_skb)) {
2441                 err =  PTR_ERR(out_skb);
2442                 goto out;
2443         }
2444         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2445         if (err < 0)
2446                 goto out;
2447
2448         out_hdr = (struct sadb_msg *) out_skb->data;
2449         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2450         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2451         out_hdr->sadb_msg_satype = 0;
2452         out_hdr->sadb_msg_errno = 0;
2453         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2454         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2455         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2456         err = 0;
2457
2458 out:
2459         return err;
2460 }
2461
2462 static int pfkey_sockaddr_pair_size(sa_family_t family)
2463 {
2464         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2465 }
2466
2467 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2468                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2469                                u16 *family)
2470 {
2471         int af, socklen;
2472
2473         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2474                 return -EINVAL;
2475
2476         af = pfkey_sockaddr_extract(sa, saddr);
2477         if (!af)
2478                 return -EINVAL;
2479
2480         socklen = pfkey_sockaddr_len(af);
2481         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2482                                    daddr) != af)
2483                 return -EINVAL;
2484
2485         *family = af;
2486         return 0;
2487 }
2488
2489 #ifdef CONFIG_NET_KEY_MIGRATE
2490 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2491                                     struct xfrm_migrate *m)
2492 {
2493         int err;
2494         struct sadb_x_ipsecrequest *rq2;
2495         int mode;
2496
2497         if (len < sizeof(*rq1) ||
2498             len < rq1->sadb_x_ipsecrequest_len ||
2499             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2500                 return -EINVAL;
2501
2502         /* old endoints */
2503         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2504                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2505                                   &m->old_saddr, &m->old_daddr,
2506                                   &m->old_family);
2507         if (err)
2508                 return err;
2509
2510         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2511         len -= rq1->sadb_x_ipsecrequest_len;
2512
2513         if (len <= sizeof(*rq2) ||
2514             len < rq2->sadb_x_ipsecrequest_len ||
2515             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2516                 return -EINVAL;
2517
2518         /* new endpoints */
2519         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2520                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2521                                   &m->new_saddr, &m->new_daddr,
2522                                   &m->new_family);
2523         if (err)
2524                 return err;
2525
2526         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2527             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2528             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2529                 return -EINVAL;
2530
2531         m->proto = rq1->sadb_x_ipsecrequest_proto;
2532         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2533                 return -EINVAL;
2534         m->mode = mode;
2535         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2536
2537         return ((int)(rq1->sadb_x_ipsecrequest_len +
2538                       rq2->sadb_x_ipsecrequest_len));
2539 }
2540
2541 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2542                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2543 {
2544         int i, len, ret, err = -EINVAL;
2545         u8 dir;
2546         struct sadb_address *sa;
2547         struct sadb_x_kmaddress *kma;
2548         struct sadb_x_policy *pol;
2549         struct sadb_x_ipsecrequest *rq;
2550         struct xfrm_selector sel;
2551         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2552         struct xfrm_kmaddress k;
2553         struct net *net = sock_net(sk);
2554
2555         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2556                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2557             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2558                 err = -EINVAL;
2559                 goto out;
2560         }
2561
2562         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2563         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2564
2565         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2566                 err = -EINVAL;
2567                 goto out;
2568         }
2569
2570         if (kma) {
2571                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2572                 k.reserved = kma->sadb_x_kmaddress_reserved;
2573                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2574                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2575                                           &k.local, &k.remote, &k.family);
2576                 if (ret < 0) {
2577                         err = ret;
2578                         goto out;
2579                 }
2580         }
2581
2582         dir = pol->sadb_x_policy_dir - 1;
2583         memset(&sel, 0, sizeof(sel));
2584
2585         /* set source address info of selector */
2586         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2587         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2588         sel.prefixlen_s = sa->sadb_address_prefixlen;
2589         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2590         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2591         if (sel.sport)
2592                 sel.sport_mask = htons(0xffff);
2593
2594         /* set destination address info of selector */
2595         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2596         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2597         sel.prefixlen_d = sa->sadb_address_prefixlen;
2598         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2599         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2600         if (sel.dport)
2601                 sel.dport_mask = htons(0xffff);
2602
2603         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2604
2605         /* extract ipsecrequests */
2606         i = 0;
2607         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2608
2609         while (len > 0 && i < XFRM_MAX_DEPTH) {
2610                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2611                 if (ret < 0) {
2612                         err = ret;
2613                         goto out;
2614                 } else {
2615                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2616                         len -= ret;
2617                         i++;
2618                 }
2619         }
2620
2621         if (!i || len > 0) {
2622                 err = -EINVAL;
2623                 goto out;
2624         }
2625
2626         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2627                             kma ? &k : NULL, net, NULL);
2628
2629  out:
2630         return err;
2631 }
2632 #else
2633 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2634                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2635 {
2636         return -ENOPROTOOPT;
2637 }
2638 #endif
2639
2640
2641 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2642 {
2643         struct net *net = sock_net(sk);
2644         unsigned int dir;
2645         int err = 0, delete;
2646         struct sadb_x_policy *pol;
2647         struct xfrm_policy *xp;
2648         struct km_event c;
2649
2650         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2651                 return -EINVAL;
2652
2653         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2654         if (dir >= XFRM_POLICY_MAX)
2655                 return -EINVAL;
2656
2657         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2658         xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
2659                               dir, pol->sadb_x_policy_id, delete, &err);
2660         if (xp == NULL)
2661                 return -ENOENT;
2662
2663         if (delete) {
2664                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2665
2666                 if (err)
2667                         goto out;
2668                 c.seq = hdr->sadb_msg_seq;
2669                 c.portid = hdr->sadb_msg_pid;
2670                 c.data.byid = 1;
2671                 c.event = XFRM_MSG_DELPOLICY;
2672                 km_policy_notify(xp, dir, &c);
2673         } else {
2674                 err = key_pol_get_resp(sk, xp, hdr, dir);
2675         }
2676
2677 out:
2678         xfrm_pol_put(xp);
2679         return err;
2680 }
2681
2682 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2683 {
2684         struct pfkey_sock *pfk = ptr;
2685         struct sk_buff *out_skb;
2686         struct sadb_msg *out_hdr;
2687         int err;
2688
2689         if (!pfkey_can_dump(&pfk->sk))
2690                 return -ENOBUFS;
2691
2692         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2693         if (IS_ERR(out_skb))
2694                 return PTR_ERR(out_skb);
2695
2696         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2697         if (err < 0)
2698                 return err;
2699
2700         out_hdr = (struct sadb_msg *) out_skb->data;
2701         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2702         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2703         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2704         out_hdr->sadb_msg_errno = 0;
2705         out_hdr->sadb_msg_seq = count + 1;
2706         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2707
2708         if (pfk->dump.skb)
2709                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2710                                 &pfk->sk, sock_net(&pfk->sk));
2711         pfk->dump.skb = out_skb;
2712
2713         return 0;
2714 }
2715
2716 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2717 {
2718         struct net *net = sock_net(&pfk->sk);
2719         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2720 }
2721
2722 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2723 {
2724         struct net *net = sock_net((struct sock *)pfk);
2725
2726         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2727 }
2728
2729 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2730 {
2731         struct pfkey_sock *pfk = pfkey_sk(sk);
2732
2733         mutex_lock(&pfk->dump_lock);
2734         if (pfk->dump.dump != NULL) {
2735                 mutex_unlock(&pfk->dump_lock);
2736                 return -EBUSY;
2737         }
2738
2739         pfk->dump.msg_version = hdr->sadb_msg_version;
2740         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2741         pfk->dump.dump = pfkey_dump_sp;
2742         pfk->dump.done = pfkey_dump_sp_done;
2743         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2744         mutex_unlock(&pfk->dump_lock);
2745
2746         return pfkey_do_dump(pfk);
2747 }
2748
2749 static int key_notify_policy_flush(const struct km_event *c)
2750 {
2751         struct sk_buff *skb_out;
2752         struct sadb_msg *hdr;
2753
2754         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2755         if (!skb_out)
2756                 return -ENOBUFS;
2757         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2758         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2759         hdr->sadb_msg_seq = c->seq;
2760         hdr->sadb_msg_pid = c->portid;
2761         hdr->sadb_msg_version = PF_KEY_V2;
2762         hdr->sadb_msg_errno = (uint8_t) 0;
2763         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2764         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2765         hdr->sadb_msg_reserved = 0;
2766         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2767         return 0;
2768
2769 }
2770
2771 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2772 {
2773         struct net *net = sock_net(sk);
2774         struct km_event c;
2775         int err, err2;
2776
2777         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2778         err2 = unicast_flush_resp(sk, hdr);
2779         if (err || err2) {
2780                 if (err == -ESRCH) /* empty table - old silent behavior */
2781                         return 0;
2782                 return err;
2783         }
2784
2785         c.data.type = XFRM_POLICY_TYPE_MAIN;
2786         c.event = XFRM_MSG_FLUSHPOLICY;
2787         c.portid = hdr->sadb_msg_pid;
2788         c.seq = hdr->sadb_msg_seq;
2789         c.net = net;
2790         km_policy_notify(NULL, 0, &c);
2791
2792         return 0;
2793 }
2794
2795 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2796                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2797 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2798         [SADB_RESERVED]         = pfkey_reserved,
2799         [SADB_GETSPI]           = pfkey_getspi,
2800         [SADB_UPDATE]           = pfkey_add,
2801         [SADB_ADD]              = pfkey_add,
2802         [SADB_DELETE]           = pfkey_delete,
2803         [SADB_GET]              = pfkey_get,
2804         [SADB_ACQUIRE]          = pfkey_acquire,
2805         [SADB_REGISTER]         = pfkey_register,
2806         [SADB_EXPIRE]           = NULL,
2807         [SADB_FLUSH]            = pfkey_flush,
2808         [SADB_DUMP]             = pfkey_dump,
2809         [SADB_X_PROMISC]        = pfkey_promisc,
2810         [SADB_X_PCHANGE]        = NULL,
2811         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2812         [SADB_X_SPDADD]         = pfkey_spdadd,
2813         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2814         [SADB_X_SPDGET]         = pfkey_spdget,
2815         [SADB_X_SPDACQUIRE]     = NULL,
2816         [SADB_X_SPDDUMP]        = pfkey_spddump,
2817         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2818         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2819         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2820         [SADB_X_MIGRATE]        = pfkey_migrate,
2821 };
2822
2823 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2824 {
2825         void *ext_hdrs[SADB_EXT_MAX];
2826         int err;
2827
2828         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2829                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2830
2831         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2832         err = parse_exthdrs(skb, hdr, ext_hdrs);
2833         if (!err) {
2834                 err = -EOPNOTSUPP;
2835                 if (pfkey_funcs[hdr->sadb_msg_type])
2836                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2837         }
2838         return err;
2839 }
2840
2841 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2842 {
2843         struct sadb_msg *hdr = NULL;
2844
2845         if (skb->len < sizeof(*hdr)) {
2846                 *errp = -EMSGSIZE;
2847         } else {
2848                 hdr = (struct sadb_msg *) skb->data;
2849                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2850                     hdr->sadb_msg_reserved != 0 ||
2851                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2852                      hdr->sadb_msg_type > SADB_MAX)) {
2853                         hdr = NULL;
2854                         *errp = -EINVAL;
2855                 } else if (hdr->sadb_msg_len != (skb->len /
2856                                                  sizeof(uint64_t)) ||
2857                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2858                                                 sizeof(uint64_t))) {
2859                         hdr = NULL;
2860                         *errp = -EMSGSIZE;
2861                 } else {
2862                         *errp = 0;
2863                 }
2864         }
2865         return hdr;
2866 }
2867
2868 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2869                                 const struct xfrm_algo_desc *d)
2870 {
2871         unsigned int id = d->desc.sadb_alg_id;
2872
2873         if (id >= sizeof(t->aalgos) * 8)
2874                 return 0;
2875
2876         return (t->aalgos >> id) & 1;
2877 }
2878
2879 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2880                                 const struct xfrm_algo_desc *d)
2881 {
2882         unsigned int id = d->desc.sadb_alg_id;
2883
2884         if (id >= sizeof(t->ealgos) * 8)
2885                 return 0;
2886
2887         return (t->ealgos >> id) & 1;
2888 }
2889
2890 static int count_ah_combs(const struct xfrm_tmpl *t)
2891 {
2892         int i, sz = 0;
2893
2894         for (i = 0; ; i++) {
2895                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2896                 if (!aalg)
2897                         break;
2898                 if (!aalg->pfkey_supported)
2899                         continue;
2900                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2901                         sz += sizeof(struct sadb_comb);
2902         }
2903         return sz + sizeof(struct sadb_prop);
2904 }
2905
2906 static int count_esp_combs(const struct xfrm_tmpl *t)
2907 {
2908         int i, k, sz = 0;
2909
2910         for (i = 0; ; i++) {
2911                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2912                 if (!ealg)
2913                         break;
2914
2915                 if (!ealg->pfkey_supported)
2916                         continue;
2917
2918                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2919                         continue;
2920
2921                 for (k = 1; ; k++) {
2922                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2923                         if (!aalg)
2924                                 break;
2925
2926                         if (!aalg->pfkey_supported)
2927                                 continue;
2928
2929                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2930                                 sz += sizeof(struct sadb_comb);
2931                 }
2932         }
2933         return sz + sizeof(struct sadb_prop);
2934 }
2935
2936 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2937 {
2938         struct sadb_prop *p;
2939         int i;
2940
2941         p = skb_put(skb, sizeof(struct sadb_prop));
2942         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2943         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2944         p->sadb_prop_replay = 32;
2945         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2946
2947         for (i = 0; ; i++) {
2948                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2949                 if (!aalg)
2950                         break;
2951
2952                 if (!aalg->pfkey_supported)
2953                         continue;
2954
2955                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2956                         struct sadb_comb *c;
2957                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2958                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2959                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2960                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2961                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2962                         c->sadb_comb_hard_addtime = 24*60*60;
2963                         c->sadb_comb_soft_addtime = 20*60*60;
2964                         c->sadb_comb_hard_usetime = 8*60*60;
2965                         c->sadb_comb_soft_usetime = 7*60*60;
2966                 }
2967         }
2968 }
2969
2970 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2971 {
2972         struct sadb_prop *p;
2973         int i, k;
2974
2975         p = skb_put(skb, sizeof(struct sadb_prop));
2976         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2977         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2978         p->sadb_prop_replay = 32;
2979         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2980
2981         for (i=0; ; i++) {
2982                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2983                 if (!ealg)
2984                         break;
2985
2986                 if (!ealg->pfkey_supported)
2987                         continue;
2988
2989                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2990                         continue;
2991
2992                 for (k = 1; ; k++) {
2993                         struct sadb_comb *c;
2994                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2995                         if (!aalg)
2996                                 break;
2997                         if (!aalg->pfkey_supported)
2998                                 continue;
2999                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3000                                 continue;
3001                         c = skb_put(skb, sizeof(struct sadb_comb));
3002                         memset(c, 0, sizeof(*c));
3003                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3004                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3005                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3006                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3007                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3008                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3009                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3010                         c->sadb_comb_hard_addtime = 24*60*60;
3011                         c->sadb_comb_soft_addtime = 20*60*60;
3012                         c->sadb_comb_hard_usetime = 8*60*60;
3013                         c->sadb_comb_soft_usetime = 7*60*60;
3014                 }
3015         }
3016 }
3017
3018 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3019 {
3020         return 0;
3021 }
3022
3023 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3024 {
3025         struct sk_buff *out_skb;
3026         struct sadb_msg *out_hdr;
3027         int hard;
3028         int hsc;
3029
3030         hard = c->data.hard;
3031         if (hard)
3032                 hsc = 2;
3033         else
3034                 hsc = 1;
3035
3036         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3037         if (IS_ERR(out_skb))
3038                 return PTR_ERR(out_skb);
3039
3040         out_hdr = (struct sadb_msg *) out_skb->data;
3041         out_hdr->sadb_msg_version = PF_KEY_V2;
3042         out_hdr->sadb_msg_type = SADB_EXPIRE;
3043         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3044         out_hdr->sadb_msg_errno = 0;
3045         out_hdr->sadb_msg_reserved = 0;
3046         out_hdr->sadb_msg_seq = 0;
3047         out_hdr->sadb_msg_pid = 0;
3048
3049         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3050                         xs_net(x));
3051         return 0;
3052 }
3053
3054 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3055 {
3056         struct net *net = x ? xs_net(x) : c->net;
3057         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3058
3059         if (atomic_read(&net_pfkey->socks_nr) == 0)
3060                 return 0;
3061
3062         switch (c->event) {
3063         case XFRM_MSG_EXPIRE:
3064                 return key_notify_sa_expire(x, c);
3065         case XFRM_MSG_DELSA:
3066         case XFRM_MSG_NEWSA:
3067         case XFRM_MSG_UPDSA:
3068                 return key_notify_sa(x, c);
3069         case XFRM_MSG_FLUSHSA:
3070                 return key_notify_sa_flush(c);
3071         case XFRM_MSG_NEWAE: /* not yet supported */
3072                 break;
3073         default:
3074                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3075                 break;
3076         }
3077
3078         return 0;
3079 }
3080
3081 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3082 {
3083         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3084                 return 0;
3085
3086         switch (c->event) {
3087         case XFRM_MSG_POLEXPIRE:
3088                 return key_notify_policy_expire(xp, c);
3089         case XFRM_MSG_DELPOLICY:
3090         case XFRM_MSG_NEWPOLICY:
3091         case XFRM_MSG_UPDPOLICY:
3092                 return key_notify_policy(xp, dir, c);
3093         case XFRM_MSG_FLUSHPOLICY:
3094                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3095                         break;
3096                 return key_notify_policy_flush(c);
3097         default:
3098                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3099                 break;
3100         }
3101
3102         return 0;
3103 }
3104
3105 static u32 get_acqseq(void)
3106 {
3107         u32 res;
3108         static atomic_t acqseq;
3109
3110         do {
3111                 res = atomic_inc_return(&acqseq);
3112         } while (!res);
3113         return res;
3114 }
3115
3116 static bool pfkey_is_alive(const struct km_event *c)
3117 {
3118         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3119         struct sock *sk;
3120         bool is_alive = false;
3121
3122         rcu_read_lock();
3123         sk_for_each_rcu(sk, &net_pfkey->table) {
3124                 if (pfkey_sk(sk)->registered) {
3125                         is_alive = true;
3126                         break;
3127                 }
3128         }
3129         rcu_read_unlock();
3130
3131         return is_alive;
3132 }
3133
3134 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3135 {
3136         struct sk_buff *skb;
3137         struct sadb_msg *hdr;
3138         struct sadb_address *addr;
3139         struct sadb_x_policy *pol;
3140         int sockaddr_size;
3141         int size;
3142         struct sadb_x_sec_ctx *sec_ctx;
3143         struct xfrm_sec_ctx *xfrm_ctx;
3144         int ctx_size = 0;
3145
3146         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3147         if (!sockaddr_size)
3148                 return -EINVAL;
3149
3150         size = sizeof(struct sadb_msg) +
3151                 (sizeof(struct sadb_address) * 2) +
3152                 (sockaddr_size * 2) +
3153                 sizeof(struct sadb_x_policy);
3154
3155         if (x->id.proto == IPPROTO_AH)
3156                 size += count_ah_combs(t);
3157         else if (x->id.proto == IPPROTO_ESP)
3158                 size += count_esp_combs(t);
3159
3160         if ((xfrm_ctx = x->security)) {
3161                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3162                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3163         }
3164
3165         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3166         if (skb == NULL)
3167                 return -ENOMEM;
3168
3169         hdr = skb_put(skb, sizeof(struct sadb_msg));
3170         hdr->sadb_msg_version = PF_KEY_V2;
3171         hdr->sadb_msg_type = SADB_ACQUIRE;
3172         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3173         hdr->sadb_msg_len = size / sizeof(uint64_t);
3174         hdr->sadb_msg_errno = 0;
3175         hdr->sadb_msg_reserved = 0;
3176         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3177         hdr->sadb_msg_pid = 0;
3178
3179         /* src address */
3180         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3181         addr->sadb_address_len =
3182                 (sizeof(struct sadb_address)+sockaddr_size)/
3183                         sizeof(uint64_t);
3184         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3185         addr->sadb_address_proto = 0;
3186         addr->sadb_address_reserved = 0;
3187         addr->sadb_address_prefixlen =
3188                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3189                                     (struct sockaddr *) (addr + 1),
3190                                     x->props.family);
3191         if (!addr->sadb_address_prefixlen)
3192                 BUG();
3193
3194         /* dst address */
3195         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3196         addr->sadb_address_len =
3197                 (sizeof(struct sadb_address)+sockaddr_size)/
3198                         sizeof(uint64_t);
3199         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3200         addr->sadb_address_proto = 0;
3201         addr->sadb_address_reserved = 0;
3202         addr->sadb_address_prefixlen =
3203                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3204                                     (struct sockaddr *) (addr + 1),
3205                                     x->props.family);
3206         if (!addr->sadb_address_prefixlen)
3207                 BUG();
3208
3209         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3210         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3211         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3212         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3213         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3214         pol->sadb_x_policy_reserved = 0;
3215         pol->sadb_x_policy_id = xp->index;
3216         pol->sadb_x_policy_priority = xp->priority;
3217
3218         /* Set sadb_comb's. */
3219         if (x->id.proto == IPPROTO_AH)
3220                 dump_ah_combs(skb, t);
3221         else if (x->id.proto == IPPROTO_ESP)
3222                 dump_esp_combs(skb, t);
3223
3224         /* security context */
3225         if (xfrm_ctx) {
3226                 sec_ctx = skb_put(skb,
3227                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3228                 sec_ctx->sadb_x_sec_len =
3229                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3230                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3231                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3232                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3233                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3234                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3235                        xfrm_ctx->ctx_len);
3236         }
3237
3238         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3239                                xs_net(x));
3240 }
3241
3242 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3243                                                 u8 *data, int len, int *dir)
3244 {
3245         struct net *net = sock_net(sk);
3246         struct xfrm_policy *xp;
3247         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3248         struct sadb_x_sec_ctx *sec_ctx;
3249
3250         switch (sk->sk_family) {
3251         case AF_INET:
3252                 if (opt != IP_IPSEC_POLICY) {
3253                         *dir = -EOPNOTSUPP;
3254                         return NULL;
3255                 }
3256                 break;
3257 #if IS_ENABLED(CONFIG_IPV6)
3258         case AF_INET6:
3259                 if (opt != IPV6_IPSEC_POLICY) {
3260                         *dir = -EOPNOTSUPP;
3261                         return NULL;
3262                 }
3263                 break;
3264 #endif
3265         default:
3266                 *dir = -EINVAL;
3267                 return NULL;
3268         }
3269
3270         *dir = -EINVAL;
3271
3272         if (len < sizeof(struct sadb_x_policy) ||
3273             pol->sadb_x_policy_len*8 > len ||
3274             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3275             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3276                 return NULL;
3277
3278         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3279         if (xp == NULL) {
3280                 *dir = -ENOBUFS;
3281                 return NULL;
3282         }
3283
3284         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3285                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3286
3287         xp->lft.soft_byte_limit = XFRM_INF;
3288         xp->lft.hard_byte_limit = XFRM_INF;
3289         xp->lft.soft_packet_limit = XFRM_INF;
3290         xp->lft.hard_packet_limit = XFRM_INF;
3291         xp->family = sk->sk_family;
3292
3293         xp->xfrm_nr = 0;
3294         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3295             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3296                 goto out;
3297
3298         /* security context too */
3299         if (len >= (pol->sadb_x_policy_len*8 +
3300             sizeof(struct sadb_x_sec_ctx))) {
3301                 char *p = (char *)pol;
3302                 struct xfrm_user_sec_ctx *uctx;
3303
3304                 p += pol->sadb_x_policy_len*8;
3305                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3306                 if (len < pol->sadb_x_policy_len*8 +
3307                     sec_ctx->sadb_x_sec_len*8) {
3308                         *dir = -EINVAL;
3309                         goto out;
3310                 }
3311                 if ((*dir = verify_sec_ctx_len(p)))
3312                         goto out;
3313                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3314                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3315                 kfree(uctx);
3316
3317                 if (*dir)
3318                         goto out;
3319         }
3320
3321         *dir = pol->sadb_x_policy_dir-1;
3322         return xp;
3323
3324 out:
3325         xp->walk.dead = 1;
3326         xfrm_policy_destroy(xp);
3327         return NULL;
3328 }
3329
3330 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3331 {
3332         struct sk_buff *skb;
3333         struct sadb_msg *hdr;
3334         struct sadb_sa *sa;
3335         struct sadb_address *addr;
3336         struct sadb_x_nat_t_port *n_port;
3337         int sockaddr_size;
3338         int size;
3339         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3340         struct xfrm_encap_tmpl *natt = NULL;
3341
3342         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3343         if (!sockaddr_size)
3344                 return -EINVAL;
3345
3346         if (!satype)
3347                 return -EINVAL;
3348
3349         if (!x->encap)
3350                 return -EINVAL;
3351
3352         natt = x->encap;
3353
3354         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3355          *
3356          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3357          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3358          */
3359
3360         size = sizeof(struct sadb_msg) +
3361                 sizeof(struct sadb_sa) +
3362                 (sizeof(struct sadb_address) * 2) +
3363                 (sockaddr_size * 2) +
3364                 (sizeof(struct sadb_x_nat_t_port) * 2);
3365
3366         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3367         if (skb == NULL)
3368                 return -ENOMEM;
3369
3370         hdr = skb_put(skb, sizeof(struct sadb_msg));
3371         hdr->sadb_msg_version = PF_KEY_V2;
3372         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3373         hdr->sadb_msg_satype = satype;
3374         hdr->sadb_msg_len = size / sizeof(uint64_t);
3375         hdr->sadb_msg_errno = 0;
3376         hdr->sadb_msg_reserved = 0;
3377         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3378         hdr->sadb_msg_pid = 0;
3379
3380         /* SA */
3381         sa = skb_put(skb, sizeof(struct sadb_sa));
3382         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3383         sa->sadb_sa_exttype = SADB_EXT_SA;
3384         sa->sadb_sa_spi = x->id.spi;
3385         sa->sadb_sa_replay = 0;
3386         sa->sadb_sa_state = 0;
3387         sa->sadb_sa_auth = 0;
3388         sa->sadb_sa_encrypt = 0;
3389         sa->sadb_sa_flags = 0;
3390
3391         /* ADDRESS_SRC (old addr) */
3392         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3393         addr->sadb_address_len =
3394                 (sizeof(struct sadb_address)+sockaddr_size)/
3395                         sizeof(uint64_t);
3396         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3397         addr->sadb_address_proto = 0;
3398         addr->sadb_address_reserved = 0;
3399         addr->sadb_address_prefixlen =
3400                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3401                                     (struct sockaddr *) (addr + 1),
3402                                     x->props.family);
3403         if (!addr->sadb_address_prefixlen)
3404                 BUG();
3405
3406         /* NAT_T_SPORT (old port) */
3407         n_port = skb_put(skb, sizeof(*n_port));
3408         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3409         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3410         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3411         n_port->sadb_x_nat_t_port_reserved = 0;
3412
3413         /* ADDRESS_DST (new addr) */
3414         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3415         addr->sadb_address_len =
3416                 (sizeof(struct sadb_address)+sockaddr_size)/
3417                         sizeof(uint64_t);
3418         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3419         addr->sadb_address_proto = 0;
3420         addr->sadb_address_reserved = 0;
3421         addr->sadb_address_prefixlen =
3422                 pfkey_sockaddr_fill(ipaddr, 0,
3423                                     (struct sockaddr *) (addr + 1),
3424                                     x->props.family);
3425         if (!addr->sadb_address_prefixlen)
3426                 BUG();
3427
3428         /* NAT_T_DPORT (new port) */
3429         n_port = skb_put(skb, sizeof(*n_port));
3430         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3431         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3432         n_port->sadb_x_nat_t_port_port = sport;
3433         n_port->sadb_x_nat_t_port_reserved = 0;
3434
3435         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3436                                xs_net(x));
3437 }
3438
3439 #ifdef CONFIG_NET_KEY_MIGRATE
3440 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3441                             const struct xfrm_selector *sel)
3442 {
3443         struct sadb_address *addr;
3444         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3445         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3446         addr->sadb_address_exttype = type;
3447         addr->sadb_address_proto = sel->proto;
3448         addr->sadb_address_reserved = 0;
3449
3450         switch (type) {
3451         case SADB_EXT_ADDRESS_SRC:
3452                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3453                 pfkey_sockaddr_fill(&sel->saddr, 0,
3454                                     (struct sockaddr *)(addr + 1),
3455                                     sel->family);
3456                 break;
3457         case SADB_EXT_ADDRESS_DST:
3458                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3459                 pfkey_sockaddr_fill(&sel->daddr, 0,
3460                                     (struct sockaddr *)(addr + 1),
3461                                     sel->family);
3462                 break;
3463         default:
3464                 return -EINVAL;
3465         }
3466
3467         return 0;
3468 }
3469
3470
3471 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3472 {
3473         struct sadb_x_kmaddress *kma;
3474         u8 *sa;
3475         int family = k->family;
3476         int socklen = pfkey_sockaddr_len(family);
3477         int size_req;
3478
3479         size_req = (sizeof(struct sadb_x_kmaddress) +
3480                     pfkey_sockaddr_pair_size(family));
3481
3482         kma = skb_put_zero(skb, size_req);
3483         kma->sadb_x_kmaddress_len = size_req / 8;
3484         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3485         kma->sadb_x_kmaddress_reserved = k->reserved;
3486
3487         sa = (u8 *)(kma + 1);
3488         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3489             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3490                 return -EINVAL;
3491
3492         return 0;
3493 }
3494
3495 static int set_ipsecrequest(struct sk_buff *skb,
3496                             uint8_t proto, uint8_t mode, int level,
3497                             uint32_t reqid, uint8_t family,
3498                             const xfrm_address_t *src, const xfrm_address_t *dst)
3499 {
3500         struct sadb_x_ipsecrequest *rq;
3501         u8 *sa;
3502         int socklen = pfkey_sockaddr_len(family);
3503         int size_req;
3504
3505         size_req = sizeof(struct sadb_x_ipsecrequest) +
3506                    pfkey_sockaddr_pair_size(family);
3507
3508         rq = skb_put_zero(skb, size_req);
3509         rq->sadb_x_ipsecrequest_len = size_req;
3510         rq->sadb_x_ipsecrequest_proto = proto;
3511         rq->sadb_x_ipsecrequest_mode = mode;
3512         rq->sadb_x_ipsecrequest_level = level;
3513         rq->sadb_x_ipsecrequest_reqid = reqid;
3514
3515         sa = (u8 *) (rq + 1);
3516         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3517             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3518                 return -EINVAL;
3519
3520         return 0;
3521 }
3522 #endif
3523
3524 #ifdef CONFIG_NET_KEY_MIGRATE
3525 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3526                               const struct xfrm_migrate *m, int num_bundles,
3527                               const struct xfrm_kmaddress *k,
3528                               const struct xfrm_encap_tmpl *encap)
3529 {
3530         int i;
3531         int sasize_sel;
3532         int size = 0;
3533         int size_pol = 0;
3534         struct sk_buff *skb;
3535         struct sadb_msg *hdr;
3536         struct sadb_x_policy *pol;
3537         const struct xfrm_migrate *mp;
3538
3539         if (type != XFRM_POLICY_TYPE_MAIN)
3540                 return 0;
3541
3542         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3543                 return -EINVAL;
3544
3545         if (k != NULL) {
3546                 /* addresses for KM */
3547                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3548                                      pfkey_sockaddr_pair_size(k->family));
3549         }
3550
3551         /* selector */
3552         sasize_sel = pfkey_sockaddr_size(sel->family);
3553         if (!sasize_sel)
3554                 return -EINVAL;
3555         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3556
3557         /* policy info */
3558         size_pol += sizeof(struct sadb_x_policy);
3559
3560         /* ipsecrequests */
3561         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3562                 /* old locator pair */
3563                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3564                             pfkey_sockaddr_pair_size(mp->old_family);
3565                 /* new locator pair */
3566                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3567                             pfkey_sockaddr_pair_size(mp->new_family);
3568         }
3569
3570         size += sizeof(struct sadb_msg) + size_pol;
3571
3572         /* alloc buffer */
3573         skb = alloc_skb(size, GFP_ATOMIC);
3574         if (skb == NULL)
3575                 return -ENOMEM;
3576
3577         hdr = skb_put(skb, sizeof(struct sadb_msg));
3578         hdr->sadb_msg_version = PF_KEY_V2;
3579         hdr->sadb_msg_type = SADB_X_MIGRATE;
3580         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3581         hdr->sadb_msg_len = size / 8;
3582         hdr->sadb_msg_errno = 0;
3583         hdr->sadb_msg_reserved = 0;
3584         hdr->sadb_msg_seq = 0;
3585         hdr->sadb_msg_pid = 0;
3586
3587         /* Addresses to be used by KM for negotiation, if ext is available */
3588         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3589                 goto err;
3590
3591         /* selector src */
3592         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3593
3594         /* selector dst */
3595         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3596
3597         /* policy information */
3598         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3599         pol->sadb_x_policy_len = size_pol / 8;
3600         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3601         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3602         pol->sadb_x_policy_dir = dir + 1;
3603         pol->sadb_x_policy_reserved = 0;
3604         pol->sadb_x_policy_id = 0;
3605         pol->sadb_x_policy_priority = 0;
3606
3607         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3608                 /* old ipsecrequest */
3609                 int mode = pfkey_mode_from_xfrm(mp->mode);
3610                 if (mode < 0)
3611                         goto err;
3612                 if (set_ipsecrequest(skb, mp->proto, mode,
3613                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3614                                      mp->reqid, mp->old_family,
3615                                      &mp->old_saddr, &mp->old_daddr) < 0)
3616                         goto err;
3617
3618                 /* new ipsecrequest */
3619                 if (set_ipsecrequest(skb, mp->proto, mode,
3620                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3621                                      mp->reqid, mp->new_family,
3622                                      &mp->new_saddr, &mp->new_daddr) < 0)
3623                         goto err;
3624         }
3625
3626         /* broadcast migrate message to sockets */
3627         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3628
3629         return 0;
3630
3631 err:
3632         kfree_skb(skb);
3633         return -EINVAL;
3634 }
3635 #else
3636 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3637                               const struct xfrm_migrate *m, int num_bundles,
3638                               const struct xfrm_kmaddress *k,
3639                               const struct xfrm_encap_tmpl *encap)
3640 {
3641         return -ENOPROTOOPT;
3642 }
3643 #endif
3644
3645 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3646 {
3647         struct sock *sk = sock->sk;
3648         struct sk_buff *skb = NULL;
3649         struct sadb_msg *hdr = NULL;
3650         int err;
3651         struct net *net = sock_net(sk);
3652
3653         err = -EOPNOTSUPP;
3654         if (msg->msg_flags & MSG_OOB)
3655                 goto out;
3656
3657         err = -EMSGSIZE;
3658         if ((unsigned int)len > sk->sk_sndbuf - 32)
3659                 goto out;
3660
3661         err = -ENOBUFS;
3662         skb = alloc_skb(len, GFP_KERNEL);
3663         if (skb == NULL)
3664                 goto out;
3665
3666         err = -EFAULT;
3667         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3668                 goto out;
3669
3670         hdr = pfkey_get_base_msg(skb, &err);
3671         if (!hdr)
3672                 goto out;
3673
3674         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3675         err = pfkey_process(sk, skb, hdr);
3676         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3677
3678 out:
3679         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3680                 err = 0;
3681         kfree_skb(skb);
3682
3683         return err ? : len;
3684 }
3685
3686 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3687                          int flags)
3688 {
3689         struct sock *sk = sock->sk;
3690         struct pfkey_sock *pfk = pfkey_sk(sk);
3691         struct sk_buff *skb;
3692         int copied, err;
3693
3694         err = -EINVAL;
3695         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3696                 goto out;
3697
3698         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3699         if (skb == NULL)
3700                 goto out;
3701
3702         copied = skb->len;
3703         if (copied > len) {
3704                 msg->msg_flags |= MSG_TRUNC;
3705                 copied = len;
3706         }
3707
3708         skb_reset_transport_header(skb);
3709         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3710         if (err)
3711                 goto out_free;
3712
3713         sock_recv_ts_and_drops(msg, sk, skb);
3714
3715         err = (flags & MSG_TRUNC) ? skb->len : copied;
3716
3717         if (pfk->dump.dump != NULL &&
3718             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3719                 pfkey_do_dump(pfk);
3720
3721 out_free:
3722         skb_free_datagram(sk, skb);
3723 out:
3724         return err;
3725 }
3726
3727 static const struct proto_ops pfkey_ops = {
3728         .family         =       PF_KEY,
3729         .owner          =       THIS_MODULE,
3730         /* Operations that make no sense on pfkey sockets. */
3731         .bind           =       sock_no_bind,
3732         .connect        =       sock_no_connect,
3733         .socketpair     =       sock_no_socketpair,
3734         .accept         =       sock_no_accept,
3735         .getname        =       sock_no_getname,
3736         .ioctl          =       sock_no_ioctl,
3737         .listen         =       sock_no_listen,
3738         .shutdown       =       sock_no_shutdown,
3739         .setsockopt     =       sock_no_setsockopt,
3740         .getsockopt     =       sock_no_getsockopt,
3741         .mmap           =       sock_no_mmap,
3742         .sendpage       =       sock_no_sendpage,
3743
3744         /* Now the operations that really occur. */
3745         .release        =       pfkey_release,
3746         .poll           =       datagram_poll,
3747         .sendmsg        =       pfkey_sendmsg,
3748         .recvmsg        =       pfkey_recvmsg,
3749 };
3750
3751 static const struct net_proto_family pfkey_family_ops = {
3752         .family =       PF_KEY,
3753         .create =       pfkey_create,
3754         .owner  =       THIS_MODULE,
3755 };
3756
3757 #ifdef CONFIG_PROC_FS
3758 static int pfkey_seq_show(struct seq_file *f, void *v)
3759 {
3760         struct sock *s = sk_entry(v);
3761
3762         if (v == SEQ_START_TOKEN)
3763                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3764         else
3765                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3766                                s,
3767                                refcount_read(&s->sk_refcnt),
3768                                sk_rmem_alloc_get(s),
3769                                sk_wmem_alloc_get(s),
3770                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3771                                sock_i_ino(s)
3772                                );
3773         return 0;
3774 }
3775
3776 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3777         __acquires(rcu)
3778 {
3779         struct net *net = seq_file_net(f);
3780         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3781
3782         rcu_read_lock();
3783         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3784 }
3785
3786 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3787 {
3788         struct net *net = seq_file_net(f);
3789         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3790
3791         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3792 }
3793
3794 static void pfkey_seq_stop(struct seq_file *f, void *v)
3795         __releases(rcu)
3796 {
3797         rcu_read_unlock();
3798 }
3799
3800 static const struct seq_operations pfkey_seq_ops = {
3801         .start  = pfkey_seq_start,
3802         .next   = pfkey_seq_next,
3803         .stop   = pfkey_seq_stop,
3804         .show   = pfkey_seq_show,
3805 };
3806
3807 static int __net_init pfkey_init_proc(struct net *net)
3808 {
3809         struct proc_dir_entry *e;
3810
3811         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3812                         sizeof(struct seq_net_private));
3813         if (e == NULL)
3814                 return -ENOMEM;
3815
3816         return 0;
3817 }
3818
3819 static void __net_exit pfkey_exit_proc(struct net *net)
3820 {
3821         remove_proc_entry("pfkey", net->proc_net);
3822 }
3823 #else
3824 static inline int pfkey_init_proc(struct net *net)
3825 {
3826         return 0;
3827 }
3828
3829 static inline void pfkey_exit_proc(struct net *net)
3830 {
3831 }
3832 #endif
3833
3834 static struct xfrm_mgr pfkeyv2_mgr =
3835 {
3836         .notify         = pfkey_send_notify,
3837         .acquire        = pfkey_send_acquire,
3838         .compile_policy = pfkey_compile_policy,
3839         .new_mapping    = pfkey_send_new_mapping,
3840         .notify_policy  = pfkey_send_policy_notify,
3841         .migrate        = pfkey_send_migrate,
3842         .is_alive       = pfkey_is_alive,
3843 };
3844
3845 static int __net_init pfkey_net_init(struct net *net)
3846 {
3847         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3848         int rv;
3849
3850         INIT_HLIST_HEAD(&net_pfkey->table);
3851         atomic_set(&net_pfkey->socks_nr, 0);
3852
3853         rv = pfkey_init_proc(net);
3854
3855         return rv;
3856 }
3857
3858 static void __net_exit pfkey_net_exit(struct net *net)
3859 {
3860         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3861
3862         pfkey_exit_proc(net);
3863         WARN_ON(!hlist_empty(&net_pfkey->table));
3864 }
3865
3866 static struct pernet_operations pfkey_net_ops = {
3867         .init = pfkey_net_init,
3868         .exit = pfkey_net_exit,
3869         .id   = &pfkey_net_id,
3870         .size = sizeof(struct netns_pfkey),
3871 };
3872
3873 static void __exit ipsec_pfkey_exit(void)
3874 {
3875         xfrm_unregister_km(&pfkeyv2_mgr);
3876         sock_unregister(PF_KEY);
3877         unregister_pernet_subsys(&pfkey_net_ops);
3878         proto_unregister(&key_proto);
3879 }
3880
3881 static int __init ipsec_pfkey_init(void)
3882 {
3883         int err = proto_register(&key_proto, 0);
3884
3885         if (err != 0)
3886                 goto out;
3887
3888         err = register_pernet_subsys(&pfkey_net_ops);
3889         if (err != 0)
3890                 goto out_unregister_key_proto;
3891         err = sock_register(&pfkey_family_ops);
3892         if (err != 0)
3893                 goto out_unregister_pernet;
3894         err = xfrm_register_km(&pfkeyv2_mgr);
3895         if (err != 0)
3896                 goto out_sock_unregister;
3897 out:
3898         return err;
3899
3900 out_sock_unregister:
3901         sock_unregister(PF_KEY);
3902 out_unregister_pernet:
3903         unregister_pernet_subsys(&pfkey_net_ops);
3904 out_unregister_key_proto:
3905         proto_unregister(&key_proto);
3906         goto out;
3907 }
3908
3909 module_init(ipsec_pfkey_init);
3910 module_exit(ipsec_pfkey_exit);
3911 MODULE_LICENSE("GPL");
3912 MODULE_ALIAS_NETPROTO(PF_KEY);