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, struct sk_buff **skb2,
 200                                gfp_t allocation, struct sock *sk)
 201 {
 202         int err = -ENOBUFS;
 203
 204         sock_hold(sk);
 205         if (*skb2 == NULL) {
 206                 if (refcount_read(&skb->users) != 1) {
 207                         *skb2 = skb_clone(skb, allocation);
 208                 } else {
 209                         *skb2 = skb;
 210                         refcount_inc(&skb->users);
 211                 }
 212         }
 213         if (*skb2 != NULL) {
 214                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 215                         skb_set_owner_r(*skb2, sk);
 216                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 217                         sk->sk_data_ready(sk);
 218                         *skb2 = NULL;
 219                         err = 0;
 220                 }
 221         }
 222         sock_put(sk);
 223         return err;
 224 }
 225
 226 /* Send SKB to all pfkey sockets matching selected criteria.  */
 227 #define BROADCAST_ALL           0
 228 #define BROADCAST_ONE           1
 229 #define BROADCAST_REGISTERED    2
 230 #define BROADCAST_PROMISC_ONLY  4
 231 static int pfkey_broadcast(struct sk_buff *skb,
 232                            int broadcast_flags, struct sock *one_sk,
 233                            struct net *net)
 234 {
 235         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 236         struct sock *sk;
 237         struct sk_buff *skb2 = NULL;
 238         int err = -ESRCH;
 239
 240         /* XXX Do we need something like netlink_overrun?  I think
 241          * XXX PF_KEY socket apps will not mind current behavior.
 242          */
 243         if (!skb)
 244                 return -ENOMEM;
 245
 246         rcu_read_lock();
 247         sk_for_each_rcu(sk, &net_pfkey->table) {
 248                 struct pfkey_sock *pfk = pfkey_sk(sk);
 249                 int err2;
 250
 251                 /* Yes, it means that if you are meant to receive this
 252                  * pfkey message you receive it twice as promiscuous
 253                  * socket.
 254                  */
 255                 if (pfk->promisc)
 256                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 257
 258                 /* the exact target will be processed later */
 259                 if (sk == one_sk)
 260                         continue;
 261                 if (broadcast_flags != BROADCAST_ALL) {
 262                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 263                                 continue;
 264                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 265                             !pfk->registered)
 266                                 continue;
 267                         if (broadcast_flags & BROADCAST_ONE)
 268                                 continue;
 269                 }
 270
 271                 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 272
 273                 /* Error is cleared after successful sending to at least one
 274                  * registered KM */
 275                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 276                         err = err2;
 277         }
 278         rcu_read_unlock();
 279
 280         if (one_sk != NULL)
 281                 err = pfkey_broadcast_one(skb, &skb2, GFP_KERNEL, one_sk);
 282
 283         kfree_skb(skb2);
 284         kfree_skb(skb);
 285         return err;
 286 }
 287
 288 static int pfkey_do_dump(struct pfkey_sock *pfk)
 289 {
 290         struct sadb_msg *hdr;
 291         int rc;
 292
 293         mutex_lock(&pfk->dump_lock);
 294         if (!pfk->dump.dump) {
 295                 rc = 0;
 296                 goto out;
 297         }
 298
 299         rc = pfk->dump.dump(pfk);
 300         if (rc == -ENOBUFS) {
 301                 rc = 0;
 302                 goto out;
 303         }
 304
 305         if (pfk->dump.skb) {
 306                 if (!pfkey_can_dump(&pfk->sk)) {
 307                         rc = 0;
 308                         goto out;
 309                 }
 310
 311                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 312                 hdr->sadb_msg_seq = 0;
 313                 hdr->sadb_msg_errno = rc;
 314                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
 315                                 &pfk->sk, sock_net(&pfk->sk));
 316                 pfk->dump.skb = NULL;
 317         }
 318
 319         pfkey_terminate_dump(pfk);
 320
 321 out:
 322         mutex_unlock(&pfk->dump_lock);
 323         return rc;
 324 }
 325
 326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 327                                  const struct sadb_msg *orig)
 328 {
 329         *new = *orig;
 330 }
 331
 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 333 {
 334         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 335         struct sadb_msg *hdr;
 336
 337         if (!skb)
 338                 return -ENOBUFS;
 339
 340         /* Woe be to the platform trying to support PFKEY yet
 341          * having normal errnos outside the 1-255 range, inclusive.
 342          */
 343         err = -err;
 344         if (err == ERESTARTSYS ||
 345             err == ERESTARTNOHAND ||
 346             err == ERESTARTNOINTR)
 347                 err = EINTR;
 348         if (err >= 512)
 349                 err = EINVAL;
 350         BUG_ON(err <= 0 || err >= 256);
 351
 352         hdr = skb_put(skb, sizeof(struct sadb_msg));
 353         pfkey_hdr_dup(hdr, orig);
 354         hdr->sadb_msg_errno = (uint8_t) err;
 355         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 356                              sizeof(uint64_t));
 357
 358         pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
 359
 360         return 0;
 361 }
 362
 363 static const u8 sadb_ext_min_len[] = {
 364         [SADB_EXT_RESERVED]             = (u8) 0,
 365         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 366         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 367         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 368         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 369         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 370         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 371         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 372         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 373         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 374         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 375         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 376         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 377         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 378         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 379         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 380         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 381         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 382         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 383         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 384         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 385         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 386         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 387         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 388         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 389         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 390         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 391 };
 392
 393 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 394 static int verify_address_len(const void *p)
 395 {
 396         const struct sadb_address *sp = p;
 397         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 398         const struct sockaddr_in *sin;
 399 #if IS_ENABLED(CONFIG_IPV6)
 400         const struct sockaddr_in6 *sin6;
 401 #endif
 402         int len;
 403
 404         switch (addr->sa_family) {
 405         case AF_INET:
 406                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 407                 if (sp->sadb_address_len != len ||
 408                     sp->sadb_address_prefixlen > 32)
 409                         return -EINVAL;
 410                 break;
 411 #if IS_ENABLED(CONFIG_IPV6)
 412         case AF_INET6:
 413                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 414                 if (sp->sadb_address_len != len ||
 415                     sp->sadb_address_prefixlen > 128)
 416                         return -EINVAL;
 417                 break;
 418 #endif
 419         default:
 420                 /* It is user using kernel to keep track of security
 421                  * associations for another protocol, such as
 422                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 423                  * lengths.
 424                  *
 425                  * XXX Actually, association/policy database is not yet
 426                  * XXX able to cope with arbitrary sockaddr families.
 427                  * XXX When it can, remove this -EINVAL.  -DaveM
 428                  */
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 436 {
 437         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 438                             sec_ctx->sadb_x_ctx_len,
 439                             sizeof(uint64_t));
 440 }
 441
 442 static inline int verify_sec_ctx_len(const void *p)
 443 {
 444         const struct sadb_x_sec_ctx *sec_ctx = p;
 445         int len = sec_ctx->sadb_x_ctx_len;
 446
 447         if (len > PAGE_SIZE)
 448                 return -EINVAL;
 449
 450         len = pfkey_sec_ctx_len(sec_ctx);
 451
 452         if (sec_ctx->sadb_x_sec_len != len)
 453                 return -EINVAL;
 454
 455         return 0;
 456 }
 457
 458 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 459                                                                      gfp_t gfp)
 460 {
 461         struct xfrm_user_sec_ctx *uctx = NULL;
 462         int ctx_size = sec_ctx->sadb_x_ctx_len;
 463
 464         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 465
 466         if (!uctx)
 467                 return NULL;
 468
 469         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 470         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 471         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 472         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 473         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 474         memcpy(uctx + 1, sec_ctx + 1,
 475                uctx->ctx_len);
 476
 477         return uctx;
 478 }
 479
 480 static int present_and_same_family(const struct sadb_address *src,
 481                                    const struct sadb_address *dst)
 482 {
 483         const struct sockaddr *s_addr, *d_addr;
 484
 485         if (!src || !dst)
 486                 return 0;
 487
 488         s_addr = (const struct sockaddr *)(src + 1);
 489         d_addr = (const struct sockaddr *)(dst + 1);
 490         if (s_addr->sa_family != d_addr->sa_family)
 491                 return 0;
 492         if (s_addr->sa_family != AF_INET
 493 #if IS_ENABLED(CONFIG_IPV6)
 494             && s_addr->sa_family != AF_INET6
 495 #endif
 496                 )
 497                 return 0;
 498
 499         return 1;
 500 }
 501
 502 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 503 {
 504         const char *p = (char *) hdr;
 505         int len = skb->len;
 506
 507         len -= sizeof(*hdr);
 508         p += sizeof(*hdr);
 509         while (len > 0) {
 510                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 511                 uint16_t ext_type;
 512                 int ext_len;
 513
 514                 ext_len  = ehdr->sadb_ext_len;
 515                 ext_len *= sizeof(uint64_t);
 516                 ext_type = ehdr->sadb_ext_type;
 517                 if (ext_len < sizeof(uint64_t) ||
 518                     ext_len > len ||
 519                     ext_type == SADB_EXT_RESERVED)
 520                         return -EINVAL;
 521
 522                 if (ext_type <= SADB_EXT_MAX) {
 523                         int min = (int) sadb_ext_min_len[ext_type];
 524                         if (ext_len < min)
 525                                 return -EINVAL;
 526                         if (ext_hdrs[ext_type-1] != NULL)
 527                                 return -EINVAL;
 528                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 529                             ext_type == SADB_EXT_ADDRESS_DST ||
 530                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 531                             ext_type == SADB_X_EXT_NAT_T_OA) {
 532                                 if (verify_address_len(p))
 533                                         return -EINVAL;
 534                         }
 535                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 536                                 if (verify_sec_ctx_len(p))
 537                                         return -EINVAL;
 538                         }
 539                         ext_hdrs[ext_type-1] = (void *) p;
 540                 }
 541                 p   += ext_len;
 542                 len -= ext_len;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static uint16_t
 549 pfkey_satype2proto(uint8_t satype)
 550 {
 551         switch (satype) {
 552         case SADB_SATYPE_UNSPEC:
 553                 return IPSEC_PROTO_ANY;
 554         case SADB_SATYPE_AH:
 555                 return IPPROTO_AH;
 556         case SADB_SATYPE_ESP:
 557                 return IPPROTO_ESP;
 558         case SADB_X_SATYPE_IPCOMP:
 559                 return IPPROTO_COMP;
 560         default:
 561                 return 0;
 562         }
 563         /* NOTREACHED */
 564 }
 565
 566 static uint8_t
 567 pfkey_proto2satype(uint16_t proto)
 568 {
 569         switch (proto) {
 570         case IPPROTO_AH:
 571                 return SADB_SATYPE_AH;
 572         case IPPROTO_ESP:
 573                 return SADB_SATYPE_ESP;
 574         case IPPROTO_COMP:
 575                 return SADB_X_SATYPE_IPCOMP;
 576         default:
 577                 return 0;
 578         }
 579         /* NOTREACHED */
 580 }
 581
 582 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 583  * say specifically 'just raw sockets' as we encode them as 255.
 584  */
 585
 586 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 587 {
 588         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 589 }
 590
 591 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 592 {
 593         return proto ? proto : IPSEC_PROTO_ANY;
 594 }
 595
 596 static inline int pfkey_sockaddr_len(sa_family_t family)
 597 {
 598         switch (family) {
 599         case AF_INET:
 600                 return sizeof(struct sockaddr_in);
 601 #if IS_ENABLED(CONFIG_IPV6)
 602         case AF_INET6:
 603                 return sizeof(struct sockaddr_in6);
 604 #endif
 605         }
 606         return 0;
 607 }
 608
 609 static
 610 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 611 {
 612         switch (sa->sa_family) {
 613         case AF_INET:
 614                 xaddr->a4 =
 615                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 616                 return AF_INET;
 617 #if IS_ENABLED(CONFIG_IPV6)
 618         case AF_INET6:
 619                 memcpy(xaddr->a6,
 620                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 621                        sizeof(struct in6_addr));
 622                 return AF_INET6;
 623 #endif
 624         }
 625         return 0;
 626 }
 627
 628 static
 629 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 630 {
 631         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 632                                       xaddr);
 633 }
 634
 635 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 636 {
 637         const struct sadb_sa *sa;
 638         const struct sadb_address *addr;
 639         uint16_t proto;
 640         unsigned short family;
 641         xfrm_address_t *xaddr;
 642
 643         sa = ext_hdrs[SADB_EXT_SA - 1];
 644         if (sa == NULL)
 645                 return NULL;
 646
 647         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 648         if (proto == 0)
 649                 return NULL;
 650
 651         /* sadb_address_len should be checked by caller */
 652         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 653         if (addr == NULL)
 654                 return NULL;
 655
 656         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 657         switch (family) {
 658         case AF_INET:
 659                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 660                 break;
 661 #if IS_ENABLED(CONFIG_IPV6)
 662         case AF_INET6:
 663                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 664                 break;
 665 #endif
 666         default:
 667                 xaddr = NULL;
 668         }
 669
 670         if (!xaddr)
 671                 return NULL;
 672
 673         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 674 }
 675
 676 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 677
 678 static int
 679 pfkey_sockaddr_size(sa_family_t family)
 680 {
 681         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 682 }
 683
 684 static inline int pfkey_mode_from_xfrm(int mode)
 685 {
 686         switch(mode) {
 687         case XFRM_MODE_TRANSPORT:
 688                 return IPSEC_MODE_TRANSPORT;
 689         case XFRM_MODE_TUNNEL:
 690                 return IPSEC_MODE_TUNNEL;
 691         case XFRM_MODE_BEET:
 692                 return IPSEC_MODE_BEET;
 693         default:
 694                 return -1;
 695         }
 696 }
 697
 698 static inline int pfkey_mode_to_xfrm(int mode)
 699 {
 700         switch(mode) {
 701         case IPSEC_MODE_ANY:    /*XXX*/
 702         case IPSEC_MODE_TRANSPORT:
 703                 return XFRM_MODE_TRANSPORT;
 704         case IPSEC_MODE_TUNNEL:
 705                 return XFRM_MODE_TUNNEL;
 706         case IPSEC_MODE_BEET:
 707                 return XFRM_MODE_BEET;
 708         default:
 709                 return -1;
 710         }
 711 }
 712
 713 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 714                                         struct sockaddr *sa,
 715                                         unsigned short family)
 716 {
 717         switch (family) {
 718         case AF_INET:
 719             {
 720                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 721                 sin->sin_family = AF_INET;
 722                 sin->sin_port = port;
 723                 sin->sin_addr.s_addr = xaddr->a4;
 724                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 725                 return 32;
 726             }
 727 #if IS_ENABLED(CONFIG_IPV6)
 728         case AF_INET6:
 729             {
 730                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 731                 sin6->sin6_family = AF_INET6;
 732                 sin6->sin6_port = port;
 733                 sin6->sin6_flowinfo = 0;
 734                 sin6->sin6_addr = xaddr->in6;
 735                 sin6->sin6_scope_id = 0;
 736                 return 128;
 737             }
 738 #endif
 739         }
 740         return 0;
 741 }
 742
 743 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 744                                               int add_keys, int hsc)
 745 {
 746         struct sk_buff *skb;
 747         struct sadb_msg *hdr;
 748         struct sadb_sa *sa;
 749         struct sadb_lifetime *lifetime;
 750         struct sadb_address *addr;
 751         struct sadb_key *key;
 752         struct sadb_x_sa2 *sa2;
 753         struct sadb_x_sec_ctx *sec_ctx;
 754         struct xfrm_sec_ctx *xfrm_ctx;
 755         int ctx_size = 0;
 756         int size;
 757         int auth_key_size = 0;
 758         int encrypt_key_size = 0;
 759         int sockaddr_size;
 760         struct xfrm_encap_tmpl *natt = NULL;
 761         int mode;
 762
 763         /* address family check */
 764         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 765         if (!sockaddr_size)
 766                 return ERR_PTR(-EINVAL);
 767
 768         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 769            key(AE), (identity(SD),) (sensitivity)> */
 770         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 771                 sizeof(struct sadb_lifetime) +
 772                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 773                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 774                         sizeof(struct sadb_address)*2 +
 775                                 sockaddr_size*2 +
 776                                         sizeof(struct sadb_x_sa2);
 777
 778         if ((xfrm_ctx = x->security)) {
 779                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 780                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 781         }
 782
 783         /* identity & sensitivity */
 784         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 785                 size += sizeof(struct sadb_address) + sockaddr_size;
 786
 787         if (add_keys) {
 788                 if (x->aalg && x->aalg->alg_key_len) {
 789                         auth_key_size =
 790                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 791                         size += sizeof(struct sadb_key) + auth_key_size;
 792                 }
 793                 if (x->ealg && x->ealg->alg_key_len) {
 794                         encrypt_key_size =
 795                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 796                         size += sizeof(struct sadb_key) + encrypt_key_size;
 797                 }
 798         }
 799         if (x->encap)
 800                 natt = x->encap;
 801
 802         if (natt && natt->encap_type) {
 803                 size += sizeof(struct sadb_x_nat_t_type);
 804                 size += sizeof(struct sadb_x_nat_t_port);
 805                 size += sizeof(struct sadb_x_nat_t_port);
 806         }
 807
 808         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 809         if (skb == NULL)
 810                 return ERR_PTR(-ENOBUFS);
 811
 812         /* call should fill header later */
 813         hdr = skb_put(skb, sizeof(struct sadb_msg));
 814         memset(hdr, 0, size);   /* XXX do we need this ? */
 815         hdr->sadb_msg_len = size / sizeof(uint64_t);
 816
 817         /* sa */
 818         sa = skb_put(skb, sizeof(struct sadb_sa));
 819         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 820         sa->sadb_sa_exttype = SADB_EXT_SA;
 821         sa->sadb_sa_spi = x->id.spi;
 822         sa->sadb_sa_replay = x->props.replay_window;
 823         switch (x->km.state) {
 824         case XFRM_STATE_VALID:
 825                 sa->sadb_sa_state = x->km.dying ?
 826                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 827                 break;
 828         case XFRM_STATE_ACQ:
 829                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 830                 break;
 831         default:
 832                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 833                 break;
 834         }
 835         sa->sadb_sa_auth = 0;
 836         if (x->aalg) {
 837                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 838                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 839                                         a->desc.sadb_alg_id : 0;
 840         }
 841         sa->sadb_sa_encrypt = 0;
 842         BUG_ON(x->ealg && x->calg);
 843         if (x->ealg) {
 844                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 845                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 846                                         a->desc.sadb_alg_id : 0;
 847         }
 848         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 849         if (x->calg) {
 850                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 851                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 852                                         a->desc.sadb_alg_id : 0;
 853         }
 854
 855         sa->sadb_sa_flags = 0;
 856         if (x->props.flags & XFRM_STATE_NOECN)
 857                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 858         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 859                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 860         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 861                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 862
 863         /* hard time */
 864         if (hsc & 2) {
 865                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 866                 lifetime->sadb_lifetime_len =
 867                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 868                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 869                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 870                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 871                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 872                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 873         }
 874         /* soft time */
 875         if (hsc & 1) {
 876                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 877                 lifetime->sadb_lifetime_len =
 878                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 879                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 880                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 881                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 882                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 883                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 884         }
 885         /* current time */
 886         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 887         lifetime->sadb_lifetime_len =
 888                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 889         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 890         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 891         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 892         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 893         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 894         /* src address */
 895         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 896         addr->sadb_address_len =
 897                 (sizeof(struct sadb_address)+sockaddr_size)/
 898                         sizeof(uint64_t);
 899         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 900         /* "if the ports are non-zero, then the sadb_address_proto field,
 901            normally zero, MUST be filled in with the transport
 902            protocol's number." - RFC2367 */
 903         addr->sadb_address_proto = 0;
 904         addr->sadb_address_reserved = 0;
 905
 906         addr->sadb_address_prefixlen =
 907                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 908                                     (struct sockaddr *) (addr + 1),
 909                                     x->props.family);
 910         if (!addr->sadb_address_prefixlen)
 911                 BUG();
 912
 913         /* dst address */
 914         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 915         addr->sadb_address_len =
 916                 (sizeof(struct sadb_address)+sockaddr_size)/
 917                         sizeof(uint64_t);
 918         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 919         addr->sadb_address_proto = 0;
 920         addr->sadb_address_reserved = 0;
 921
 922         addr->sadb_address_prefixlen =
 923                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 924                                     (struct sockaddr *) (addr + 1),
 925                                     x->props.family);
 926         if (!addr->sadb_address_prefixlen)
 927                 BUG();
 928
 929         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 930                              x->props.family)) {
 931                 addr = skb_put(skb,
 932                                sizeof(struct sadb_address) + sockaddr_size);
 933                 addr->sadb_address_len =
 934                         (sizeof(struct sadb_address)+sockaddr_size)/
 935                         sizeof(uint64_t);
 936                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 937                 addr->sadb_address_proto =
 938                         pfkey_proto_from_xfrm(x->sel.proto);
 939                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 940                 addr->sadb_address_reserved = 0;
 941
 942                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 943                                     (struct sockaddr *) (addr + 1),
 944                                     x->props.family);
 945         }
 946
 947         /* auth key */
 948         if (add_keys && auth_key_size) {
 949                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 950                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 951                         sizeof(uint64_t);
 952                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 953                 key->sadb_key_bits = x->aalg->alg_key_len;
 954                 key->sadb_key_reserved = 0;
 955                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 956         }
 957         /* encrypt key */
 958         if (add_keys && encrypt_key_size) {
 959                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 960                 key->sadb_key_len = (sizeof(struct sadb_key) +
 961                                      encrypt_key_size) / sizeof(uint64_t);
 962                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 963                 key->sadb_key_bits = x->ealg->alg_key_len;
 964                 key->sadb_key_reserved = 0;
 965                 memcpy(key + 1, x->ealg->alg_key,
 966                        (x->ealg->alg_key_len+7)/8);
 967         }
 968
 969         /* sa */
 970         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 971         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 972         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 973         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 974                 kfree_skb(skb);
 975                 return ERR_PTR(-EINVAL);
 976         }
 977         sa2->sadb_x_sa2_mode = mode;
 978         sa2->sadb_x_sa2_reserved1 = 0;
 979         sa2->sadb_x_sa2_reserved2 = 0;
 980         sa2->sadb_x_sa2_sequence = 0;
 981         sa2->sadb_x_sa2_reqid = x->props.reqid;
 982
 983         if (natt && natt->encap_type) {
 984                 struct sadb_x_nat_t_type *n_type;
 985                 struct sadb_x_nat_t_port *n_port;
 986
 987                 /* type */
 988                 n_type = skb_put(skb, sizeof(*n_type));
 989                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 990                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 991                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 992                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 993                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 994                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 995
 996                 /* source port */
 997                 n_port = skb_put(skb, sizeof(*n_port));
 998                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 999                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1000                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1001                 n_port->sadb_x_nat_t_port_reserved = 0;
1002
1003                 /* dest port */
1004                 n_port = skb_put(skb, sizeof(*n_port));
1005                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1006                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1007                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1008                 n_port->sadb_x_nat_t_port_reserved = 0;
1009         }
1010
1011         /* security context */
1012         if (xfrm_ctx) {
1013                 sec_ctx = skb_put(skb,
1014                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1015                 sec_ctx->sadb_x_sec_len =
1016                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1017                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1018                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1019                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1020                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1021                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1022                        xfrm_ctx->ctx_len);
1023         }
1024
1025         return skb;
1026 }
1027
1028
1029 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1030 {
1031         struct sk_buff *skb;
1032
1033         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1034
1035         return skb;
1036 }
1037
1038 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1039                                                           int hsc)
1040 {
1041         return __pfkey_xfrm_state2msg(x, 0, hsc);
1042 }
1043
1044 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1045                                                 const struct sadb_msg *hdr,
1046                                                 void * const *ext_hdrs)
1047 {
1048         struct xfrm_state *x;
1049         const struct sadb_lifetime *lifetime;
1050         const struct sadb_sa *sa;
1051         const struct sadb_key *key;
1052         const struct sadb_x_sec_ctx *sec_ctx;
1053         uint16_t proto;
1054         int err;
1055
1056
1057         sa = ext_hdrs[SADB_EXT_SA - 1];
1058         if (!sa ||
1059             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1060                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1061                 return ERR_PTR(-EINVAL);
1062         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1063             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1064                 return ERR_PTR(-EINVAL);
1065         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1066             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1067                 return ERR_PTR(-EINVAL);
1068         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1069             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1070                 return ERR_PTR(-EINVAL);
1071
1072         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1073         if (proto == 0)
1074                 return ERR_PTR(-EINVAL);
1075
1076         /* default error is no buffer space */
1077         err = -ENOBUFS;
1078
1079         /* RFC2367:
1080
1081    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1082    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1083    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1084    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1085    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1086    not true.
1087
1088            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1089            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1090          */
1091         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1092             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1093              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1094             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1095                 return ERR_PTR(-EINVAL);
1096         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1097         if (key != NULL &&
1098             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1099             ((key->sadb_key_bits+7) / 8 == 0 ||
1100              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1101                 return ERR_PTR(-EINVAL);
1102         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1103         if (key != NULL &&
1104             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1105             ((key->sadb_key_bits+7) / 8 == 0 ||
1106              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1107                 return ERR_PTR(-EINVAL);
1108
1109         x = xfrm_state_alloc(net);
1110         if (x == NULL)
1111                 return ERR_PTR(-ENOBUFS);
1112
1113         x->id.proto = proto;
1114         x->id.spi = sa->sadb_sa_spi;
1115         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1116                                         (sizeof(x->replay.bitmap) * 8));
1117         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1118                 x->props.flags |= XFRM_STATE_NOECN;
1119         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1120                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1121         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1122                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1123
1124         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1125         if (lifetime != NULL) {
1126                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1127                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1128                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1129                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1130         }
1131         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1132         if (lifetime != NULL) {
1133                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1134                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1135                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1136                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1137         }
1138
1139         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1140         if (sec_ctx != NULL) {
1141                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1142
1143                 if (!uctx)
1144                         goto out;
1145
1146                 err = security_xfrm_state_alloc(x, uctx);
1147                 kfree(uctx);
1148
1149                 if (err)
1150                         goto out;
1151         }
1152
1153         err = -ENOBUFS;
1154         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1155         if (sa->sadb_sa_auth) {
1156                 int keysize = 0;
1157                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1158                 if (!a || !a->pfkey_supported) {
1159                         err = -ENOSYS;
1160                         goto out;
1161                 }
1162                 if (key)
1163                         keysize = (key->sadb_key_bits + 7) / 8;
1164                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1165                 if (!x->aalg) {
1166                         err = -ENOMEM;
1167                         goto out;
1168                 }
1169                 strcpy(x->aalg->alg_name, a->name);
1170                 x->aalg->alg_key_len = 0;
1171                 if (key) {
1172                         x->aalg->alg_key_len = key->sadb_key_bits;
1173                         memcpy(x->aalg->alg_key, key+1, keysize);
1174                 }
1175                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1176                 x->props.aalgo = sa->sadb_sa_auth;
1177                 /* x->algo.flags = sa->sadb_sa_flags; */
1178         }
1179         if (sa->sadb_sa_encrypt) {
1180                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1181                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1182                         if (!a || !a->pfkey_supported) {
1183                                 err = -ENOSYS;
1184                                 goto out;
1185                         }
1186                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1187                         if (!x->calg) {
1188                                 err = -ENOMEM;
1189                                 goto out;
1190                         }
1191                         strcpy(x->calg->alg_name, a->name);
1192                         x->props.calgo = sa->sadb_sa_encrypt;
1193                 } else {
1194                         int keysize = 0;
1195                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1196                         if (!a || !a->pfkey_supported) {
1197                                 err = -ENOSYS;
1198                                 goto out;
1199                         }
1200                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1201                         if (key)
1202                                 keysize = (key->sadb_key_bits + 7) / 8;
1203                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1204                         if (!x->ealg) {
1205                                 err = -ENOMEM;
1206                                 goto out;
1207                         }
1208                         strcpy(x->ealg->alg_name, a->name);
1209                         x->ealg->alg_key_len = 0;
1210                         if (key) {
1211                                 x->ealg->alg_key_len = key->sadb_key_bits;
1212                                 memcpy(x->ealg->alg_key, key+1, keysize);
1213                         }
1214                         x->props.ealgo = sa->sadb_sa_encrypt;
1215                         x->geniv = a->uinfo.encr.geniv;
1216                 }
1217         }
1218         /* x->algo.flags = sa->sadb_sa_flags; */
1219
1220         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1221                                                     &x->props.saddr);
1222         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1223                                   &x->id.daddr);
1224
1225         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1226                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1227                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1228                 if (mode < 0) {
1229                         err = -EINVAL;
1230                         goto out;
1231                 }
1232                 x->props.mode = mode;
1233                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1234         }
1235
1236         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1237                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1238
1239                 /* Nobody uses this, but we try. */
1240                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1241                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1242         }
1243
1244         if (!x->sel.family)
1245                 x->sel.family = x->props.family;
1246
1247         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1248                 const struct sadb_x_nat_t_type* n_type;
1249                 struct xfrm_encap_tmpl *natt;
1250
1251                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1252                 if (!x->encap) {
1253                         err = -ENOMEM;
1254                         goto out;
1255                 }
1256
1257                 natt = x->encap;
1258                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1259                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1260
1261                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1262                         const struct sadb_x_nat_t_port *n_port =
1263                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1264                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1265                 }
1266                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1267                         const struct sadb_x_nat_t_port *n_port =
1268                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1269                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1270                 }
1271                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1272         }
1273
1274         err = xfrm_init_state(x);
1275         if (err)
1276                 goto out;
1277
1278         x->km.seq = hdr->sadb_msg_seq;
1279         return x;
1280
1281 out:
1282         x->km.state = XFRM_STATE_DEAD;
1283         xfrm_state_put(x);
1284         return ERR_PTR(err);
1285 }
1286
1287 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1288 {
1289         return -EOPNOTSUPP;
1290 }
1291
1292 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1293 {
1294         struct net *net = sock_net(sk);
1295         struct sk_buff *resp_skb;
1296         struct sadb_x_sa2 *sa2;
1297         struct sadb_address *saddr, *daddr;
1298         struct sadb_msg *out_hdr;
1299         struct sadb_spirange *range;
1300         struct xfrm_state *x = NULL;
1301         int mode;
1302         int err;
1303         u32 min_spi, max_spi;
1304         u32 reqid;
1305         u8 proto;
1306         unsigned short family;
1307         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1308
1309         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1310                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1311                 return -EINVAL;
1312
1313         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1314         if (proto == 0)
1315                 return -EINVAL;
1316
1317         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1318                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1319                 if (mode < 0)
1320                         return -EINVAL;
1321                 reqid = sa2->sadb_x_sa2_reqid;
1322         } else {
1323                 mode = 0;
1324                 reqid = 0;
1325         }
1326
1327         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1328         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1329
1330         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1331         switch (family) {
1332         case AF_INET:
1333                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1334                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1335                 break;
1336 #if IS_ENABLED(CONFIG_IPV6)
1337         case AF_INET6:
1338                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1339                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1340                 break;
1341 #endif
1342         }
1343
1344         if (hdr->sadb_msg_seq) {
1345                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1346                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1347                         xfrm_state_put(x);
1348                         x = NULL;
1349                 }
1350         }
1351
1352         if (!x)
1353                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1354
1355         if (x == NULL)
1356                 return -ENOENT;
1357
1358         min_spi = 0x100;
1359         max_spi = 0x0fffffff;
1360
1361         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1362         if (range) {
1363                 min_spi = range->sadb_spirange_min;
1364                 max_spi = range->sadb_spirange_max;
1365         }
1366
1367         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1368         if (err) {
1369                 xfrm_state_put(x);
1370                 return err;
1371         }
1372
1373         err = xfrm_alloc_spi(x, min_spi, max_spi);
1374         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1375
1376         if (IS_ERR(resp_skb)) {
1377                 xfrm_state_put(x);
1378                 return  PTR_ERR(resp_skb);
1379         }
1380
1381         out_hdr = (struct sadb_msg *) resp_skb->data;
1382         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1383         out_hdr->sadb_msg_type = SADB_GETSPI;
1384         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1385         out_hdr->sadb_msg_errno = 0;
1386         out_hdr->sadb_msg_reserved = 0;
1387         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1388         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1389
1390         xfrm_state_put(x);
1391
1392         pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1393
1394         return 0;
1395 }
1396
1397 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1398 {
1399         struct net *net = sock_net(sk);
1400         struct xfrm_state *x;
1401
1402         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1403                 return -EOPNOTSUPP;
1404
1405         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1406                 return 0;
1407
1408         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1409         if (x == NULL)
1410                 return 0;
1411
1412         spin_lock_bh(&x->lock);
1413         if (x->km.state == XFRM_STATE_ACQ)
1414                 x->km.state = XFRM_STATE_ERROR;
1415
1416         spin_unlock_bh(&x->lock);
1417         xfrm_state_put(x);
1418         return 0;
1419 }
1420
1421 static inline int event2poltype(int event)
1422 {
1423         switch (event) {
1424         case XFRM_MSG_DELPOLICY:
1425                 return SADB_X_SPDDELETE;
1426         case XFRM_MSG_NEWPOLICY:
1427                 return SADB_X_SPDADD;
1428         case XFRM_MSG_UPDPOLICY:
1429                 return SADB_X_SPDUPDATE;
1430         case XFRM_MSG_POLEXPIRE:
1431         //      return SADB_X_SPDEXPIRE;
1432         default:
1433                 pr_err("pfkey: Unknown policy event %d\n", event);
1434                 break;
1435         }
1436
1437         return 0;
1438 }
1439
1440 static inline int event2keytype(int event)
1441 {
1442         switch (event) {
1443         case XFRM_MSG_DELSA:
1444                 return SADB_DELETE;
1445         case XFRM_MSG_NEWSA:
1446                 return SADB_ADD;
1447         case XFRM_MSG_UPDSA:
1448                 return SADB_UPDATE;
1449         case XFRM_MSG_EXPIRE:
1450                 return SADB_EXPIRE;
1451         default:
1452                 pr_err("pfkey: Unknown SA event %d\n", event);
1453                 break;
1454         }
1455
1456         return 0;
1457 }
1458
1459 /* ADD/UPD/DEL */
1460 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1461 {
1462         struct sk_buff *skb;
1463         struct sadb_msg *hdr;
1464
1465         skb = pfkey_xfrm_state2msg(x);
1466
1467         if (IS_ERR(skb))
1468                 return PTR_ERR(skb);
1469
1470         hdr = (struct sadb_msg *) skb->data;
1471         hdr->sadb_msg_version = PF_KEY_V2;
1472         hdr->sadb_msg_type = event2keytype(c->event);
1473         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1474         hdr->sadb_msg_errno = 0;
1475         hdr->sadb_msg_reserved = 0;
1476         hdr->sadb_msg_seq = c->seq;
1477         hdr->sadb_msg_pid = c->portid;
1478
1479         pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1480
1481         return 0;
1482 }
1483
1484 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1485 {
1486         struct net *net = sock_net(sk);
1487         struct xfrm_state *x;
1488         int err;
1489         struct km_event c;
1490
1491         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1492         if (IS_ERR(x))
1493                 return PTR_ERR(x);
1494
1495         xfrm_state_hold(x);
1496         if (hdr->sadb_msg_type == SADB_ADD)
1497                 err = xfrm_state_add(x);
1498         else
1499                 err = xfrm_state_update(x);
1500
1501         xfrm_audit_state_add(x, err ? 0 : 1, true);
1502
1503         if (err < 0) {
1504                 x->km.state = XFRM_STATE_DEAD;
1505                 __xfrm_state_put(x);
1506                 goto out;
1507         }
1508
1509         if (hdr->sadb_msg_type == SADB_ADD)
1510                 c.event = XFRM_MSG_NEWSA;
1511         else
1512                 c.event = XFRM_MSG_UPDSA;
1513         c.seq = hdr->sadb_msg_seq;
1514         c.portid = hdr->sadb_msg_pid;
1515         km_state_notify(x, &c);
1516 out:
1517         xfrm_state_put(x);
1518         return err;
1519 }
1520
1521 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1522 {
1523         struct net *net = sock_net(sk);
1524         struct xfrm_state *x;
1525         struct km_event c;
1526         int err;
1527
1528         if (!ext_hdrs[SADB_EXT_SA-1] ||
1529             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1530                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1531                 return -EINVAL;
1532
1533         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1534         if (x == NULL)
1535                 return -ESRCH;
1536
1537         if ((err = security_xfrm_state_delete(x)))
1538                 goto out;
1539
1540         if (xfrm_state_kern(x)) {
1541                 err = -EPERM;
1542                 goto out;
1543         }
1544
1545         err = xfrm_state_delete(x);
1546
1547         if (err < 0)
1548                 goto out;
1549
1550         c.seq = hdr->sadb_msg_seq;
1551         c.portid = hdr->sadb_msg_pid;
1552         c.event = XFRM_MSG_DELSA;
1553         km_state_notify(x, &c);
1554 out:
1555         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1556         xfrm_state_put(x);
1557
1558         return err;
1559 }
1560
1561 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1562 {
1563         struct net *net = sock_net(sk);
1564         __u8 proto;
1565         struct sk_buff *out_skb;
1566         struct sadb_msg *out_hdr;
1567         struct xfrm_state *x;
1568
1569         if (!ext_hdrs[SADB_EXT_SA-1] ||
1570             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1571                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1572                 return -EINVAL;
1573
1574         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1575         if (x == NULL)
1576                 return -ESRCH;
1577
1578         out_skb = pfkey_xfrm_state2msg(x);
1579         proto = x->id.proto;
1580         xfrm_state_put(x);
1581         if (IS_ERR(out_skb))
1582                 return  PTR_ERR(out_skb);
1583
1584         out_hdr = (struct sadb_msg *) out_skb->data;
1585         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1586         out_hdr->sadb_msg_type = SADB_GET;
1587         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1588         out_hdr->sadb_msg_errno = 0;
1589         out_hdr->sadb_msg_reserved = 0;
1590         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1591         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1592         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1593
1594         return 0;
1595 }
1596
1597 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1598                                               gfp_t allocation)
1599 {
1600         struct sk_buff *skb;
1601         struct sadb_msg *hdr;
1602         int len, auth_len, enc_len, i;
1603
1604         auth_len = xfrm_count_pfkey_auth_supported();
1605         if (auth_len) {
1606                 auth_len *= sizeof(struct sadb_alg);
1607                 auth_len += sizeof(struct sadb_supported);
1608         }
1609
1610         enc_len = xfrm_count_pfkey_enc_supported();
1611         if (enc_len) {
1612                 enc_len *= sizeof(struct sadb_alg);
1613                 enc_len += sizeof(struct sadb_supported);
1614         }
1615
1616         len = enc_len + auth_len + sizeof(struct sadb_msg);
1617
1618         skb = alloc_skb(len + 16, allocation);
1619         if (!skb)
1620                 goto out_put_algs;
1621
1622         hdr = skb_put(skb, sizeof(*hdr));
1623         pfkey_hdr_dup(hdr, orig);
1624         hdr->sadb_msg_errno = 0;
1625         hdr->sadb_msg_len = len / sizeof(uint64_t);
1626
1627         if (auth_len) {
1628                 struct sadb_supported *sp;
1629                 struct sadb_alg *ap;
1630
1631                 sp = skb_put(skb, auth_len);
1632                 ap = (struct sadb_alg *) (sp + 1);
1633
1634                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1635                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1636
1637                 for (i = 0; ; i++) {
1638                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1639                         if (!aalg)
1640                                 break;
1641                         if (!aalg->pfkey_supported)
1642                                 continue;
1643                         if (aalg->available)
1644                                 *ap++ = aalg->desc;
1645                 }
1646         }
1647
1648         if (enc_len) {
1649                 struct sadb_supported *sp;
1650                 struct sadb_alg *ap;
1651
1652                 sp = skb_put(skb, enc_len);
1653                 ap = (struct sadb_alg *) (sp + 1);
1654
1655                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1656                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1657
1658                 for (i = 0; ; i++) {
1659                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1660                         if (!ealg)
1661                                 break;
1662                         if (!ealg->pfkey_supported)
1663                                 continue;
1664                         if (ealg->available)
1665                                 *ap++ = ealg->desc;
1666                 }
1667         }
1668
1669 out_put_algs:
1670         return skb;
1671 }
1672
1673 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1674 {
1675         struct pfkey_sock *pfk = pfkey_sk(sk);
1676         struct sk_buff *supp_skb;
1677
1678         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1679                 return -EINVAL;
1680
1681         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1682                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1683                         return -EEXIST;
1684                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1685         }
1686
1687         xfrm_probe_algs();
1688
1689         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1690         if (!supp_skb) {
1691                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1692                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1693
1694                 return -ENOBUFS;
1695         }
1696
1697         pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1698
1699         return 0;
1700 }
1701
1702 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1703 {
1704         struct sk_buff *skb;
1705         struct sadb_msg *hdr;
1706
1707         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1708         if (!skb)
1709                 return -ENOBUFS;
1710
1711         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1712         hdr->sadb_msg_errno = (uint8_t) 0;
1713         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1714
1715         return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1716 }
1717
1718 static int key_notify_sa_flush(const struct km_event *c)
1719 {
1720         struct sk_buff *skb;
1721         struct sadb_msg *hdr;
1722
1723         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1724         if (!skb)
1725                 return -ENOBUFS;
1726         hdr = skb_put(skb, sizeof(struct sadb_msg));
1727         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1728         hdr->sadb_msg_type = SADB_FLUSH;
1729         hdr->sadb_msg_seq = c->seq;
1730         hdr->sadb_msg_pid = c->portid;
1731         hdr->sadb_msg_version = PF_KEY_V2;
1732         hdr->sadb_msg_errno = (uint8_t) 0;
1733         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1734         hdr->sadb_msg_reserved = 0;
1735
1736         pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1737
1738         return 0;
1739 }
1740
1741 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1742 {
1743         struct net *net = sock_net(sk);
1744         unsigned int proto;
1745         struct km_event c;
1746         int err, err2;
1747
1748         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1749         if (proto == 0)
1750                 return -EINVAL;
1751
1752         err = xfrm_state_flush(net, proto, true);
1753         err2 = unicast_flush_resp(sk, hdr);
1754         if (err || err2) {
1755                 if (err == -ESRCH) /* empty table - go quietly */
1756                         err = 0;
1757                 return err ? err : err2;
1758         }
1759
1760         c.data.proto = proto;
1761         c.seq = hdr->sadb_msg_seq;
1762         c.portid = hdr->sadb_msg_pid;
1763         c.event = XFRM_MSG_FLUSHSA;
1764         c.net = net;
1765         km_state_notify(NULL, &c);
1766
1767         return 0;
1768 }
1769
1770 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1771 {
1772         struct pfkey_sock *pfk = ptr;
1773         struct sk_buff *out_skb;
1774         struct sadb_msg *out_hdr;
1775
1776         if (!pfkey_can_dump(&pfk->sk))
1777                 return -ENOBUFS;
1778
1779         out_skb = pfkey_xfrm_state2msg(x);
1780         if (IS_ERR(out_skb))
1781                 return PTR_ERR(out_skb);
1782
1783         out_hdr = (struct sadb_msg *) out_skb->data;
1784         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1785         out_hdr->sadb_msg_type = SADB_DUMP;
1786         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1787         out_hdr->sadb_msg_errno = 0;
1788         out_hdr->sadb_msg_reserved = 0;
1789         out_hdr->sadb_msg_seq = count + 1;
1790         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1791
1792         if (pfk->dump.skb)
1793                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1794                                 &pfk->sk, sock_net(&pfk->sk));
1795         pfk->dump.skb = out_skb;
1796
1797         return 0;
1798 }
1799
1800 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1801 {
1802         struct net *net = sock_net(&pfk->sk);
1803         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1804 }
1805
1806 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1807 {
1808         struct net *net = sock_net(&pfk->sk);
1809
1810         xfrm_state_walk_done(&pfk->dump.u.state, net);
1811 }
1812
1813 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1814 {
1815         u8 proto;
1816         struct xfrm_address_filter *filter = NULL;
1817         struct pfkey_sock *pfk = pfkey_sk(sk);
1818
1819         mutex_lock(&pfk->dump_lock);
1820         if (pfk->dump.dump != NULL) {
1821                 mutex_unlock(&pfk->dump_lock);
1822                 return -EBUSY;
1823         }
1824
1825         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1826         if (proto == 0) {
1827                 mutex_unlock(&pfk->dump_lock);
1828                 return -EINVAL;
1829         }
1830
1831         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1832                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1833
1834                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1835                 if (filter == NULL) {
1836                         mutex_unlock(&pfk->dump_lock);
1837                         return -ENOMEM;
1838                 }
1839
1840                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1841                        sizeof(xfrm_address_t));
1842                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1843                        sizeof(xfrm_address_t));
1844                 filter->family = xfilter->sadb_x_filter_family;
1845                 filter->splen = xfilter->sadb_x_filter_splen;
1846                 filter->dplen = xfilter->sadb_x_filter_dplen;
1847         }
1848
1849         pfk->dump.msg_version = hdr->sadb_msg_version;
1850         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1851         pfk->dump.dump = pfkey_dump_sa;
1852         pfk->dump.done = pfkey_dump_sa_done;
1853         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1854         mutex_unlock(&pfk->dump_lock);
1855
1856         return pfkey_do_dump(pfk);
1857 }
1858
1859 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1860 {
1861         struct pfkey_sock *pfk = pfkey_sk(sk);
1862         int satype = hdr->sadb_msg_satype;
1863         bool reset_errno = false;
1864
1865         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1866                 reset_errno = true;
1867                 if (satype != 0 && satype != 1)
1868                         return -EINVAL;
1869                 pfk->promisc = satype;
1870         }
1871         if (reset_errno && skb_cloned(skb))
1872                 skb = skb_copy(skb, GFP_KERNEL);
1873         else
1874                 skb = skb_clone(skb, GFP_KERNEL);
1875
1876         if (reset_errno && skb) {
1877                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1878                 new_hdr->sadb_msg_errno = 0;
1879         }
1880
1881         pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1882         return 0;
1883 }
1884
1885 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1886 {
1887         int i;
1888         u32 reqid = *(u32*)ptr;
1889
1890         for (i=0; i<xp->xfrm_nr; i++) {
1891                 if (xp->xfrm_vec[i].reqid == reqid)
1892                         return -EEXIST;
1893         }
1894         return 0;
1895 }
1896
1897 static u32 gen_reqid(struct net *net)
1898 {
1899         struct xfrm_policy_walk walk;
1900         u32 start;
1901         int rc;
1902         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1903
1904         start = reqid;
1905         do {
1906                 ++reqid;
1907                 if (reqid == 0)
1908                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1909                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1910                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1911                 xfrm_policy_walk_done(&walk, net);
1912                 if (rc != -EEXIST)
1913                         return reqid;
1914         } while (reqid != start);
1915         return 0;
1916 }
1917
1918 static int
1919 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1920 {
1921         struct net *net = xp_net(xp);
1922         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1923         int mode;
1924
1925         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1926                 return -ELOOP;
1927
1928         if (rq->sadb_x_ipsecrequest_mode == 0)
1929                 return -EINVAL;
1930
1931         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1932         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1933                 return -EINVAL;
1934         t->mode = mode;
1935         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1936                 t->optional = 1;
1937         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1938                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1939                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1940                         t->reqid = 0;
1941                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1942                         return -ENOBUFS;
1943         }
1944
1945         /* addresses present only in tunnel mode */
1946         if (t->mode == XFRM_MODE_TUNNEL) {
1947                 int err;
1948
1949                 err = parse_sockaddr_pair(
1950                         (struct sockaddr *)(rq + 1),
1951                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1952                         &t->saddr, &t->id.daddr, &t->encap_family);
1953                 if (err)
1954                         return err;
1955         } else
1956                 t->encap_family = xp->family;
1957
1958         /* No way to set this via kame pfkey */
1959         t->allalgs = 1;
1960         xp->xfrm_nr++;
1961         return 0;
1962 }
1963
1964 static int
1965 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1966 {
1967         int err;
1968         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1969         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1970
1971         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1972                 return -EINVAL;
1973
1974         while (len >= sizeof(*rq)) {
1975                 if (len < rq->sadb_x_ipsecrequest_len ||
1976                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1977                         return -EINVAL;
1978
1979                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1980                         return err;
1981                 len -= rq->sadb_x_ipsecrequest_len;
1982                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1983         }
1984         return 0;
1985 }
1986
1987 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1988 {
1989   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1990
1991         if (xfrm_ctx) {
1992                 int len = sizeof(struct sadb_x_sec_ctx);
1993                 len += xfrm_ctx->ctx_len;
1994                 return PFKEY_ALIGN8(len);
1995         }
1996         return 0;
1997 }
1998
1999 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2000 {
2001         const struct xfrm_tmpl *t;
2002         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2003         int socklen = 0;
2004         int i;
2005
2006         for (i=0; i<xp->xfrm_nr; i++) {
2007                 t = xp->xfrm_vec + i;
2008                 socklen += pfkey_sockaddr_len(t->encap_family);
2009         }
2010
2011         return sizeof(struct sadb_msg) +
2012                 (sizeof(struct sadb_lifetime) * 3) +
2013                 (sizeof(struct sadb_address) * 2) +
2014                 (sockaddr_size * 2) +
2015                 sizeof(struct sadb_x_policy) +
2016                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2017                 (socklen * 2) +
2018                 pfkey_xfrm_policy2sec_ctx_size(xp);
2019 }
2020
2021 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2022 {
2023         struct sk_buff *skb;
2024         int size;
2025
2026         size = pfkey_xfrm_policy2msg_size(xp);
2027
2028         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2029         if (skb == NULL)
2030                 return ERR_PTR(-ENOBUFS);
2031
2032         return skb;
2033 }
2034
2035 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2036 {
2037         struct sadb_msg *hdr;
2038         struct sadb_address *addr;
2039         struct sadb_lifetime *lifetime;
2040         struct sadb_x_policy *pol;
2041         struct sadb_x_sec_ctx *sec_ctx;
2042         struct xfrm_sec_ctx *xfrm_ctx;
2043         int i;
2044         int size;
2045         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2046         int socklen = pfkey_sockaddr_len(xp->family);
2047
2048         size = pfkey_xfrm_policy2msg_size(xp);
2049
2050         /* call should fill header later */
2051         hdr = skb_put(skb, sizeof(struct sadb_msg));
2052         memset(hdr, 0, size);   /* XXX do we need this ? */
2053
2054         /* src address */
2055         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2056         addr->sadb_address_len =
2057                 (sizeof(struct sadb_address)+sockaddr_size)/
2058                         sizeof(uint64_t);
2059         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2060         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2061         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2062         addr->sadb_address_reserved = 0;
2063         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2064                                  xp->selector.sport,
2065                                  (struct sockaddr *) (addr + 1),
2066                                  xp->family))
2067                 BUG();
2068
2069         /* dst address */
2070         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2071         addr->sadb_address_len =
2072                 (sizeof(struct sadb_address)+sockaddr_size)/
2073                         sizeof(uint64_t);
2074         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2075         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2076         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2077         addr->sadb_address_reserved = 0;
2078
2079         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2080                             (struct sockaddr *) (addr + 1),
2081                             xp->family);
2082
2083         /* hard time */
2084         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2085         lifetime->sadb_lifetime_len =
2086                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2087         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2088         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2089         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2090         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2091         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2092         /* soft time */
2093         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2094         lifetime->sadb_lifetime_len =
2095                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2096         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2097         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2098         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2099         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2100         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2101         /* current time */
2102         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2103         lifetime->sadb_lifetime_len =
2104                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2105         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2106         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2107         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2108         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2109         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2110
2111         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2112         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2113         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2114         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2115         if (xp->action == XFRM_POLICY_ALLOW) {
2116                 if (xp->xfrm_nr)
2117                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2118                 else
2119                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2120         }
2121         pol->sadb_x_policy_dir = dir+1;
2122         pol->sadb_x_policy_reserved = 0;
2123         pol->sadb_x_policy_id = xp->index;
2124         pol->sadb_x_policy_priority = xp->priority;
2125
2126         for (i=0; i<xp->xfrm_nr; i++) {
2127                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2128                 struct sadb_x_ipsecrequest *rq;
2129                 int req_size;
2130                 int mode;
2131
2132                 req_size = sizeof(struct sadb_x_ipsecrequest);
2133                 if (t->mode == XFRM_MODE_TUNNEL) {
2134                         socklen = pfkey_sockaddr_len(t->encap_family);
2135                         req_size += socklen * 2;
2136                 } else {
2137                         size -= 2*socklen;
2138                 }
2139                 rq = skb_put(skb, req_size);
2140                 pol->sadb_x_policy_len += req_size/8;
2141                 memset(rq, 0, sizeof(*rq));
2142                 rq->sadb_x_ipsecrequest_len = req_size;
2143                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2144                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2145                         return -EINVAL;
2146                 rq->sadb_x_ipsecrequest_mode = mode;
2147                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2148                 if (t->reqid)
2149                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2150                 if (t->optional)
2151                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2152                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2153
2154                 if (t->mode == XFRM_MODE_TUNNEL) {
2155                         u8 *sa = (void *)(rq + 1);
2156                         pfkey_sockaddr_fill(&t->saddr, 0,
2157                                             (struct sockaddr *)sa,
2158                                             t->encap_family);
2159                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2160                                             (struct sockaddr *) (sa + socklen),
2161                                             t->encap_family);
2162                 }
2163         }
2164
2165         /* security context */
2166         if ((xfrm_ctx = xp->security)) {
2167                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2168
2169                 sec_ctx = skb_put(skb, ctx_size);
2170                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2171                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2172                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2173                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2174                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2175                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2176                        xfrm_ctx->ctx_len);
2177         }
2178
2179         hdr->sadb_msg_len = size / sizeof(uint64_t);
2180         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2181
2182         return 0;
2183 }
2184
2185 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2186 {
2187         struct sk_buff *out_skb;
2188         struct sadb_msg *out_hdr;
2189         int err;
2190
2191         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2192         if (IS_ERR(out_skb))
2193                 return PTR_ERR(out_skb);
2194
2195         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2196         if (err < 0)
2197                 return err;
2198
2199         out_hdr = (struct sadb_msg *) out_skb->data;
2200         out_hdr->sadb_msg_version = PF_KEY_V2;
2201
2202         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2203                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2204         else
2205                 out_hdr->sadb_msg_type = event2poltype(c->event);
2206         out_hdr->sadb_msg_errno = 0;
2207         out_hdr->sadb_msg_seq = c->seq;
2208         out_hdr->sadb_msg_pid = c->portid;
2209         pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2210         return 0;
2211
2212 }
2213
2214 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2215 {
2216         struct net *net = sock_net(sk);
2217         int err = 0;
2218         struct sadb_lifetime *lifetime;
2219         struct sadb_address *sa;
2220         struct sadb_x_policy *pol;
2221         struct xfrm_policy *xp;
2222         struct km_event c;
2223         struct sadb_x_sec_ctx *sec_ctx;
2224
2225         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2226                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2227             !ext_hdrs[SADB_X_EXT_POLICY-1])
2228                 return -EINVAL;
2229
2230         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2231         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2232                 return -EINVAL;
2233         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2234                 return -EINVAL;
2235
2236         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2237         if (xp == NULL)
2238                 return -ENOBUFS;
2239
2240         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2241                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2242         xp->priority = pol->sadb_x_policy_priority;
2243
2244         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2245         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2246         xp->selector.family = xp->family;
2247         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2248         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2249         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2250         if (xp->selector.sport)
2251                 xp->selector.sport_mask = htons(0xffff);
2252
2253         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2254         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2255         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2256
2257         /* Amusing, we set this twice.  KAME apps appear to set same value
2258          * in both addresses.
2259          */
2260         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2261
2262         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2263         if (xp->selector.dport)
2264                 xp->selector.dport_mask = htons(0xffff);
2265
2266         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2267         if (sec_ctx != NULL) {
2268                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2269
2270                 if (!uctx) {
2271                         err = -ENOBUFS;
2272                         goto out;
2273                 }
2274
2275                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2276                 kfree(uctx);
2277
2278                 if (err)
2279                         goto out;
2280         }
2281
2282         xp->lft.soft_byte_limit = XFRM_INF;
2283         xp->lft.hard_byte_limit = XFRM_INF;
2284         xp->lft.soft_packet_limit = XFRM_INF;
2285         xp->lft.hard_packet_limit = XFRM_INF;
2286         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2287                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2288                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2289                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2290                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2291         }
2292         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2293                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2294                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2295                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2296                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2297         }
2298         xp->xfrm_nr = 0;
2299         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2300             (err = parse_ipsecrequests(xp, pol)) < 0)
2301                 goto out;
2302
2303         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2304                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2305
2306         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2307
2308         if (err)
2309                 goto out;
2310
2311         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2312                 c.event = XFRM_MSG_UPDPOLICY;
2313         else
2314                 c.event = XFRM_MSG_NEWPOLICY;
2315
2316         c.seq = hdr->sadb_msg_seq;
2317         c.portid = hdr->sadb_msg_pid;
2318
2319         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2320         xfrm_pol_put(xp);
2321         return 0;
2322
2323 out:
2324         xp->walk.dead = 1;
2325         xfrm_policy_destroy(xp);
2326         return err;
2327 }
2328
2329 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2330 {
2331         struct net *net = sock_net(sk);
2332         int err;
2333         struct sadb_address *sa;
2334         struct sadb_x_policy *pol;
2335         struct xfrm_policy *xp;
2336         struct xfrm_selector sel;
2337         struct km_event c;
2338         struct sadb_x_sec_ctx *sec_ctx;
2339         struct xfrm_sec_ctx *pol_ctx = NULL;
2340
2341         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2342                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2343             !ext_hdrs[SADB_X_EXT_POLICY-1])
2344                 return -EINVAL;
2345
2346         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2347         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2348                 return -EINVAL;
2349
2350         memset(&sel, 0, sizeof(sel));
2351
2352         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2353         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2354         sel.prefixlen_s = sa->sadb_address_prefixlen;
2355         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2356         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2357         if (sel.sport)
2358                 sel.sport_mask = htons(0xffff);
2359
2360         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2361         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2362         sel.prefixlen_d = sa->sadb_address_prefixlen;
2363         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2364         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2365         if (sel.dport)
2366                 sel.dport_mask = htons(0xffff);
2367
2368         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2369         if (sec_ctx != NULL) {
2370                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2371
2372                 if (!uctx)
2373                         return -ENOMEM;
2374
2375                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2376                 kfree(uctx);
2377                 if (err)
2378                         return err;
2379         }
2380
2381         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2382                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2383                                    1, &err);
2384         security_xfrm_policy_free(pol_ctx);
2385         if (xp == NULL)
2386                 return -ENOENT;
2387
2388         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2389
2390         if (err)
2391                 goto out;
2392
2393         c.seq = hdr->sadb_msg_seq;
2394         c.portid = hdr->sadb_msg_pid;
2395         c.data.byid = 0;
2396         c.event = XFRM_MSG_DELPOLICY;
2397         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2398
2399 out:
2400         xfrm_pol_put(xp);
2401         if (err == 0)
2402                 xfrm_garbage_collect(net);
2403         return err;
2404 }
2405
2406 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2407 {
2408         int err;
2409         struct sk_buff *out_skb;
2410         struct sadb_msg *out_hdr;
2411         err = 0;
2412
2413         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2414         if (IS_ERR(out_skb)) {
2415                 err =  PTR_ERR(out_skb);
2416                 goto out;
2417         }
2418         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2419         if (err < 0)
2420                 goto out;
2421
2422         out_hdr = (struct sadb_msg *) out_skb->data;
2423         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2424         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2425         out_hdr->sadb_msg_satype = 0;
2426         out_hdr->sadb_msg_errno = 0;
2427         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2428         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2429         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2430         err = 0;
2431
2432 out:
2433         return err;
2434 }
2435
2436 static int pfkey_sockaddr_pair_size(sa_family_t family)
2437 {
2438         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2439 }
2440
2441 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2442                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2443                                u16 *family)
2444 {
2445         int af, socklen;
2446
2447         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2448                 return -EINVAL;
2449
2450         af = pfkey_sockaddr_extract(sa, saddr);
2451         if (!af)
2452                 return -EINVAL;
2453
2454         socklen = pfkey_sockaddr_len(af);
2455         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2456                                    daddr) != af)
2457                 return -EINVAL;
2458
2459         *family = af;
2460         return 0;
2461 }
2462
2463 #ifdef CONFIG_NET_KEY_MIGRATE
2464 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2465                                     struct xfrm_migrate *m)
2466 {
2467         int err;
2468         struct sadb_x_ipsecrequest *rq2;
2469         int mode;
2470
2471         if (len < sizeof(*rq1) ||
2472             len < rq1->sadb_x_ipsecrequest_len ||
2473             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2474                 return -EINVAL;
2475
2476         /* old endoints */
2477         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2478                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2479                                   &m->old_saddr, &m->old_daddr,
2480                                   &m->old_family);
2481         if (err)
2482                 return err;
2483
2484         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2485         len -= rq1->sadb_x_ipsecrequest_len;
2486
2487         if (len <= sizeof(*rq2) ||
2488             len < rq2->sadb_x_ipsecrequest_len ||
2489             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2490                 return -EINVAL;
2491
2492         /* new endpoints */
2493         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2494                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2495                                   &m->new_saddr, &m->new_daddr,
2496                                   &m->new_family);
2497         if (err)
2498                 return err;
2499
2500         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2501             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2502             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2503                 return -EINVAL;
2504
2505         m->proto = rq1->sadb_x_ipsecrequest_proto;
2506         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2507                 return -EINVAL;
2508         m->mode = mode;
2509         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2510
2511         return ((int)(rq1->sadb_x_ipsecrequest_len +
2512                       rq2->sadb_x_ipsecrequest_len));
2513 }
2514
2515 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2516                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2517 {
2518         int i, len, ret, err = -EINVAL;
2519         u8 dir;
2520         struct sadb_address *sa;
2521         struct sadb_x_kmaddress *kma;
2522         struct sadb_x_policy *pol;
2523         struct sadb_x_ipsecrequest *rq;
2524         struct xfrm_selector sel;
2525         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2526         struct xfrm_kmaddress k;
2527         struct net *net = sock_net(sk);
2528
2529         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2530                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2531             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2532                 err = -EINVAL;
2533                 goto out;
2534         }
2535
2536         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2537         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2538
2539         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2540                 err = -EINVAL;
2541                 goto out;
2542         }
2543
2544         if (kma) {
2545                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2546                 k.reserved = kma->sadb_x_kmaddress_reserved;
2547                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2548                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2549                                           &k.local, &k.remote, &k.family);
2550                 if (ret < 0) {
2551                         err = ret;
2552                         goto out;
2553                 }
2554         }
2555
2556         dir = pol->sadb_x_policy_dir - 1;
2557         memset(&sel, 0, sizeof(sel));
2558
2559         /* set source address info of selector */
2560         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2561         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2562         sel.prefixlen_s = sa->sadb_address_prefixlen;
2563         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2564         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2565         if (sel.sport)
2566                 sel.sport_mask = htons(0xffff);
2567
2568         /* set destination address info of selector */
2569         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2570         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2571         sel.prefixlen_d = sa->sadb_address_prefixlen;
2572         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2573         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2574         if (sel.dport)
2575                 sel.dport_mask = htons(0xffff);
2576
2577         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2578
2579         /* extract ipsecrequests */
2580         i = 0;
2581         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2582
2583         while (len > 0 && i < XFRM_MAX_DEPTH) {
2584                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2585                 if (ret < 0) {
2586                         err = ret;
2587                         goto out;
2588                 } else {
2589                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2590                         len -= ret;
2591                         i++;
2592                 }
2593         }
2594
2595         if (!i || len > 0) {
2596                 err = -EINVAL;
2597                 goto out;
2598         }
2599
2600         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2601                             kma ? &k : NULL, net, NULL);
2602
2603  out:
2604         return err;
2605 }
2606 #else
2607 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2608                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2609 {
2610         return -ENOPROTOOPT;
2611 }
2612 #endif
2613
2614
2615 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2616 {
2617         struct net *net = sock_net(sk);
2618         unsigned int dir;
2619         int err = 0, delete;
2620         struct sadb_x_policy *pol;
2621         struct xfrm_policy *xp;
2622         struct km_event c;
2623
2624         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2625                 return -EINVAL;
2626
2627         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2628         if (dir >= XFRM_POLICY_MAX)
2629                 return -EINVAL;
2630
2631         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2632         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2633                               dir, pol->sadb_x_policy_id, delete, &err);
2634         if (xp == NULL)
2635                 return -ENOENT;
2636
2637         if (delete) {
2638                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2639
2640                 if (err)
2641                         goto out;
2642                 c.seq = hdr->sadb_msg_seq;
2643                 c.portid = hdr->sadb_msg_pid;
2644                 c.data.byid = 1;
2645                 c.event = XFRM_MSG_DELPOLICY;
2646                 km_policy_notify(xp, dir, &c);
2647         } else {
2648                 err = key_pol_get_resp(sk, xp, hdr, dir);
2649         }
2650
2651 out:
2652         xfrm_pol_put(xp);
2653         if (delete && err == 0)
2654                 xfrm_garbage_collect(net);
2655         return err;
2656 }
2657
2658 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2659 {
2660         struct pfkey_sock *pfk = ptr;
2661         struct sk_buff *out_skb;
2662         struct sadb_msg *out_hdr;
2663         int err;
2664
2665         if (!pfkey_can_dump(&pfk->sk))
2666                 return -ENOBUFS;
2667
2668         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2669         if (IS_ERR(out_skb))
2670                 return PTR_ERR(out_skb);
2671
2672         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2673         if (err < 0)
2674                 return err;
2675
2676         out_hdr = (struct sadb_msg *) out_skb->data;
2677         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2678         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2679         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2680         out_hdr->sadb_msg_errno = 0;
2681         out_hdr->sadb_msg_seq = count + 1;
2682         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2683
2684         if (pfk->dump.skb)
2685                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2686                                 &pfk->sk, sock_net(&pfk->sk));
2687         pfk->dump.skb = out_skb;
2688
2689         return 0;
2690 }
2691
2692 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2693 {
2694         struct net *net = sock_net(&pfk->sk);
2695         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2696 }
2697
2698 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2699 {
2700         struct net *net = sock_net((struct sock *)pfk);
2701
2702         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2703 }
2704
2705 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2706 {
2707         struct pfkey_sock *pfk = pfkey_sk(sk);
2708
2709         mutex_lock(&pfk->dump_lock);
2710         if (pfk->dump.dump != NULL) {
2711                 mutex_unlock(&pfk->dump_lock);
2712                 return -EBUSY;
2713         }
2714
2715         pfk->dump.msg_version = hdr->sadb_msg_version;
2716         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2717         pfk->dump.dump = pfkey_dump_sp;
2718         pfk->dump.done = pfkey_dump_sp_done;
2719         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2720         mutex_unlock(&pfk->dump_lock);
2721
2722         return pfkey_do_dump(pfk);
2723 }
2724
2725 static int key_notify_policy_flush(const struct km_event *c)
2726 {
2727         struct sk_buff *skb_out;
2728         struct sadb_msg *hdr;
2729
2730         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2731         if (!skb_out)
2732                 return -ENOBUFS;
2733         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2734         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2735         hdr->sadb_msg_seq = c->seq;
2736         hdr->sadb_msg_pid = c->portid;
2737         hdr->sadb_msg_version = PF_KEY_V2;
2738         hdr->sadb_msg_errno = (uint8_t) 0;
2739         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2740         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2741         hdr->sadb_msg_reserved = 0;
2742         pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2743         return 0;
2744
2745 }
2746
2747 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2748 {
2749         struct net *net = sock_net(sk);
2750         struct km_event c;
2751         int err, err2;
2752
2753         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2754         if (!err)
2755                 xfrm_garbage_collect(net);
2756         err2 = unicast_flush_resp(sk, hdr);
2757         if (err || err2) {
2758                 if (err == -ESRCH) /* empty table - old silent behavior */
2759                         return 0;
2760                 return err;
2761         }
2762
2763         c.data.type = XFRM_POLICY_TYPE_MAIN;
2764         c.event = XFRM_MSG_FLUSHPOLICY;
2765         c.portid = hdr->sadb_msg_pid;
2766         c.seq = hdr->sadb_msg_seq;
2767         c.net = net;
2768         km_policy_notify(NULL, 0, &c);
2769
2770         return 0;
2771 }
2772
2773 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2774                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2775 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2776         [SADB_RESERVED]         = pfkey_reserved,
2777         [SADB_GETSPI]           = pfkey_getspi,
2778         [SADB_UPDATE]           = pfkey_add,
2779         [SADB_ADD]              = pfkey_add,
2780         [SADB_DELETE]           = pfkey_delete,
2781         [SADB_GET]              = pfkey_get,
2782         [SADB_ACQUIRE]          = pfkey_acquire,
2783         [SADB_REGISTER]         = pfkey_register,
2784         [SADB_EXPIRE]           = NULL,
2785         [SADB_FLUSH]            = pfkey_flush,
2786         [SADB_DUMP]             = pfkey_dump,
2787         [SADB_X_PROMISC]        = pfkey_promisc,
2788         [SADB_X_PCHANGE]        = NULL,
2789         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2790         [SADB_X_SPDADD]         = pfkey_spdadd,
2791         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2792         [SADB_X_SPDGET]         = pfkey_spdget,
2793         [SADB_X_SPDACQUIRE]     = NULL,
2794         [SADB_X_SPDDUMP]        = pfkey_spddump,
2795         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2796         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2797         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2798         [SADB_X_MIGRATE]        = pfkey_migrate,
2799 };
2800
2801 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2802 {
2803         void *ext_hdrs[SADB_EXT_MAX];
2804         int err;
2805
2806         pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2807                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2808
2809         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2810         err = parse_exthdrs(skb, hdr, ext_hdrs);
2811         if (!err) {
2812                 err = -EOPNOTSUPP;
2813                 if (pfkey_funcs[hdr->sadb_msg_type])
2814                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2815         }
2816         return err;
2817 }
2818
2819 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2820 {
2821         struct sadb_msg *hdr = NULL;
2822
2823         if (skb->len < sizeof(*hdr)) {
2824                 *errp = -EMSGSIZE;
2825         } else {
2826                 hdr = (struct sadb_msg *) skb->data;
2827                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2828                     hdr->sadb_msg_reserved != 0 ||
2829                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2830                      hdr->sadb_msg_type > SADB_MAX)) {
2831                         hdr = NULL;
2832                         *errp = -EINVAL;
2833                 } else if (hdr->sadb_msg_len != (skb->len /
2834                                                  sizeof(uint64_t)) ||
2835                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2836                                                 sizeof(uint64_t))) {
2837                         hdr = NULL;
2838                         *errp = -EMSGSIZE;
2839                 } else {
2840                         *errp = 0;
2841                 }
2842         }
2843         return hdr;
2844 }
2845
2846 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2847                                 const struct xfrm_algo_desc *d)
2848 {
2849         unsigned int id = d->desc.sadb_alg_id;
2850
2851         if (id >= sizeof(t->aalgos) * 8)
2852                 return 0;
2853
2854         return (t->aalgos >> id) & 1;
2855 }
2856
2857 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2858                                 const struct xfrm_algo_desc *d)
2859 {
2860         unsigned int id = d->desc.sadb_alg_id;
2861
2862         if (id >= sizeof(t->ealgos) * 8)
2863                 return 0;
2864
2865         return (t->ealgos >> id) & 1;
2866 }
2867
2868 static int count_ah_combs(const struct xfrm_tmpl *t)
2869 {
2870         int i, sz = 0;
2871
2872         for (i = 0; ; i++) {
2873                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2874                 if (!aalg)
2875                         break;
2876                 if (!aalg->pfkey_supported)
2877                         continue;
2878                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2879                         sz += sizeof(struct sadb_comb);
2880         }
2881         return sz + sizeof(struct sadb_prop);
2882 }
2883
2884 static int count_esp_combs(const struct xfrm_tmpl *t)
2885 {
2886         int i, k, sz = 0;
2887
2888         for (i = 0; ; i++) {
2889                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2890                 if (!ealg)
2891                         break;
2892
2893                 if (!ealg->pfkey_supported)
2894                         continue;
2895
2896                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2897                         continue;
2898
2899                 for (k = 1; ; k++) {
2900                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2901                         if (!aalg)
2902                                 break;
2903
2904                         if (!aalg->pfkey_supported)
2905                                 continue;
2906
2907                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2908                                 sz += sizeof(struct sadb_comb);
2909                 }
2910         }
2911         return sz + sizeof(struct sadb_prop);
2912 }
2913
2914 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2915 {
2916         struct sadb_prop *p;
2917         int i;
2918
2919         p = skb_put(skb, sizeof(struct sadb_prop));
2920         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2921         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2922         p->sadb_prop_replay = 32;
2923         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2924
2925         for (i = 0; ; i++) {
2926                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2927                 if (!aalg)
2928                         break;
2929
2930                 if (!aalg->pfkey_supported)
2931                         continue;
2932
2933                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2934                         struct sadb_comb *c;
2935                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2936                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2937                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2938                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2939                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2940                         c->sadb_comb_hard_addtime = 24*60*60;
2941                         c->sadb_comb_soft_addtime = 20*60*60;
2942                         c->sadb_comb_hard_usetime = 8*60*60;
2943                         c->sadb_comb_soft_usetime = 7*60*60;
2944                 }
2945         }
2946 }
2947
2948 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2949 {
2950         struct sadb_prop *p;
2951         int i, k;
2952
2953         p = skb_put(skb, sizeof(struct sadb_prop));
2954         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2955         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2956         p->sadb_prop_replay = 32;
2957         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2958
2959         for (i=0; ; i++) {
2960                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2961                 if (!ealg)
2962                         break;
2963
2964                 if (!ealg->pfkey_supported)
2965                         continue;
2966
2967                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2968                         continue;
2969
2970                 for (k = 1; ; k++) {
2971                         struct sadb_comb *c;
2972                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2973                         if (!aalg)
2974                                 break;
2975                         if (!aalg->pfkey_supported)
2976                                 continue;
2977                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2978                                 continue;
2979                         c = skb_put(skb, sizeof(struct sadb_comb));
2980                         memset(c, 0, sizeof(*c));
2981                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2982                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2983                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2984                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2985                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2986                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2987                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2988                         c->sadb_comb_hard_addtime = 24*60*60;
2989                         c->sadb_comb_soft_addtime = 20*60*60;
2990                         c->sadb_comb_hard_usetime = 8*60*60;
2991                         c->sadb_comb_soft_usetime = 7*60*60;
2992                 }
2993         }
2994 }
2995
2996 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2997 {
2998         return 0;
2999 }
3000
3001 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3002 {
3003         struct sk_buff *out_skb;
3004         struct sadb_msg *out_hdr;
3005         int hard;
3006         int hsc;
3007
3008         hard = c->data.hard;
3009         if (hard)
3010                 hsc = 2;
3011         else
3012                 hsc = 1;
3013
3014         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3015         if (IS_ERR(out_skb))
3016                 return PTR_ERR(out_skb);
3017
3018         out_hdr = (struct sadb_msg *) out_skb->data;
3019         out_hdr->sadb_msg_version = PF_KEY_V2;
3020         out_hdr->sadb_msg_type = SADB_EXPIRE;
3021         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3022         out_hdr->sadb_msg_errno = 0;
3023         out_hdr->sadb_msg_reserved = 0;
3024         out_hdr->sadb_msg_seq = 0;
3025         out_hdr->sadb_msg_pid = 0;
3026
3027         pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3028         return 0;
3029 }
3030
3031 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3032 {
3033         struct net *net = x ? xs_net(x) : c->net;
3034         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3035
3036         if (atomic_read(&net_pfkey->socks_nr) == 0)
3037                 return 0;
3038
3039         switch (c->event) {
3040         case XFRM_MSG_EXPIRE:
3041                 return key_notify_sa_expire(x, c);
3042         case XFRM_MSG_DELSA:
3043         case XFRM_MSG_NEWSA:
3044         case XFRM_MSG_UPDSA:
3045                 return key_notify_sa(x, c);
3046         case XFRM_MSG_FLUSHSA:
3047                 return key_notify_sa_flush(c);
3048         case XFRM_MSG_NEWAE: /* not yet supported */
3049                 break;
3050         default:
3051                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3052                 break;
3053         }
3054
3055         return 0;
3056 }
3057
3058 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3059 {
3060         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3061                 return 0;
3062
3063         switch (c->event) {
3064         case XFRM_MSG_POLEXPIRE:
3065                 return key_notify_policy_expire(xp, c);
3066         case XFRM_MSG_DELPOLICY:
3067         case XFRM_MSG_NEWPOLICY:
3068         case XFRM_MSG_UPDPOLICY:
3069                 return key_notify_policy(xp, dir, c);
3070         case XFRM_MSG_FLUSHPOLICY:
3071                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3072                         break;
3073                 return key_notify_policy_flush(c);
3074         default:
3075                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3076                 break;
3077         }
3078
3079         return 0;
3080 }
3081
3082 static u32 get_acqseq(void)
3083 {
3084         u32 res;
3085         static atomic_t acqseq;
3086
3087         do {
3088                 res = atomic_inc_return(&acqseq);
3089         } while (!res);
3090         return res;
3091 }
3092
3093 static bool pfkey_is_alive(const struct km_event *c)
3094 {
3095         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3096         struct sock *sk;
3097         bool is_alive = false;
3098
3099         rcu_read_lock();
3100         sk_for_each_rcu(sk, &net_pfkey->table) {
3101                 if (pfkey_sk(sk)->registered) {
3102                         is_alive = true;
3103                         break;
3104                 }
3105         }
3106         rcu_read_unlock();
3107
3108         return is_alive;
3109 }
3110
3111 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3112 {
3113         struct sk_buff *skb;
3114         struct sadb_msg *hdr;
3115         struct sadb_address *addr;
3116         struct sadb_x_policy *pol;
3117         int sockaddr_size;
3118         int size;
3119         struct sadb_x_sec_ctx *sec_ctx;
3120         struct xfrm_sec_ctx *xfrm_ctx;
3121         int ctx_size = 0;
3122
3123         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3124         if (!sockaddr_size)
3125                 return -EINVAL;
3126
3127         size = sizeof(struct sadb_msg) +
3128                 (sizeof(struct sadb_address) * 2) +
3129                 (sockaddr_size * 2) +
3130                 sizeof(struct sadb_x_policy);
3131
3132         if (x->id.proto == IPPROTO_AH)
3133                 size += count_ah_combs(t);
3134         else if (x->id.proto == IPPROTO_ESP)
3135                 size += count_esp_combs(t);
3136
3137         if ((xfrm_ctx = x->security)) {
3138                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3139                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3140         }
3141
3142         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3143         if (skb == NULL)
3144                 return -ENOMEM;
3145
3146         hdr = skb_put(skb, sizeof(struct sadb_msg));
3147         hdr->sadb_msg_version = PF_KEY_V2;
3148         hdr->sadb_msg_type = SADB_ACQUIRE;
3149         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3150         hdr->sadb_msg_len = size / sizeof(uint64_t);
3151         hdr->sadb_msg_errno = 0;
3152         hdr->sadb_msg_reserved = 0;
3153         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3154         hdr->sadb_msg_pid = 0;
3155
3156         /* src address */
3157         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3158         addr->sadb_address_len =
3159                 (sizeof(struct sadb_address)+sockaddr_size)/
3160                         sizeof(uint64_t);
3161         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3162         addr->sadb_address_proto = 0;
3163         addr->sadb_address_reserved = 0;
3164         addr->sadb_address_prefixlen =
3165                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3166                                     (struct sockaddr *) (addr + 1),
3167                                     x->props.family);
3168         if (!addr->sadb_address_prefixlen)
3169                 BUG();
3170
3171         /* dst address */
3172         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3173         addr->sadb_address_len =
3174                 (sizeof(struct sadb_address)+sockaddr_size)/
3175                         sizeof(uint64_t);
3176         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3177         addr->sadb_address_proto = 0;
3178         addr->sadb_address_reserved = 0;
3179         addr->sadb_address_prefixlen =
3180                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3181                                     (struct sockaddr *) (addr + 1),
3182                                     x->props.family);
3183         if (!addr->sadb_address_prefixlen)
3184                 BUG();
3185
3186         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3187         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3188         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3189         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3190         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3191         pol->sadb_x_policy_reserved = 0;
3192         pol->sadb_x_policy_id = xp->index;
3193         pol->sadb_x_policy_priority = xp->priority;
3194
3195         /* Set sadb_comb's. */
3196         if (x->id.proto == IPPROTO_AH)
3197                 dump_ah_combs(skb, t);
3198         else if (x->id.proto == IPPROTO_ESP)
3199                 dump_esp_combs(skb, t);
3200
3201         /* security context */
3202         if (xfrm_ctx) {
3203                 sec_ctx = skb_put(skb,
3204                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3205                 sec_ctx->sadb_x_sec_len =
3206                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3207                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3208                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3209                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3210                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3211                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3212                        xfrm_ctx->ctx_len);
3213         }
3214
3215         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3216 }
3217
3218 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3219                                                 u8 *data, int len, int *dir)
3220 {
3221         struct net *net = sock_net(sk);
3222         struct xfrm_policy *xp;
3223         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3224         struct sadb_x_sec_ctx *sec_ctx;
3225
3226         switch (sk->sk_family) {
3227         case AF_INET:
3228                 if (opt != IP_IPSEC_POLICY) {
3229                         *dir = -EOPNOTSUPP;
3230                         return NULL;
3231                 }
3232                 break;
3233 #if IS_ENABLED(CONFIG_IPV6)
3234         case AF_INET6:
3235                 if (opt != IPV6_IPSEC_POLICY) {
3236                         *dir = -EOPNOTSUPP;
3237                         return NULL;
3238                 }
3239                 break;
3240 #endif
3241         default:
3242                 *dir = -EINVAL;
3243                 return NULL;
3244         }
3245
3246         *dir = -EINVAL;
3247
3248         if (len < sizeof(struct sadb_x_policy) ||
3249             pol->sadb_x_policy_len*8 > len ||
3250             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3251             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3252                 return NULL;
3253
3254         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3255         if (xp == NULL) {
3256                 *dir = -ENOBUFS;
3257                 return NULL;
3258         }
3259
3260         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3261                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3262
3263         xp->lft.soft_byte_limit = XFRM_INF;
3264         xp->lft.hard_byte_limit = XFRM_INF;
3265         xp->lft.soft_packet_limit = XFRM_INF;
3266         xp->lft.hard_packet_limit = XFRM_INF;
3267         xp->family = sk->sk_family;
3268
3269         xp->xfrm_nr = 0;
3270         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3271             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3272                 goto out;
3273
3274         /* security context too */
3275         if (len >= (pol->sadb_x_policy_len*8 +
3276             sizeof(struct sadb_x_sec_ctx))) {
3277                 char *p = (char *)pol;
3278                 struct xfrm_user_sec_ctx *uctx;
3279
3280                 p += pol->sadb_x_policy_len*8;
3281                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3282                 if (len < pol->sadb_x_policy_len*8 +
3283                     sec_ctx->sadb_x_sec_len*8) {
3284                         *dir = -EINVAL;
3285                         goto out;
3286                 }
3287                 if ((*dir = verify_sec_ctx_len(p)))
3288                         goto out;
3289                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3290                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3291                 kfree(uctx);
3292
3293                 if (*dir)
3294                         goto out;
3295         }
3296
3297         *dir = pol->sadb_x_policy_dir-1;
3298         return xp;
3299
3300 out:
3301         xp->walk.dead = 1;
3302         xfrm_policy_destroy(xp);
3303         return NULL;
3304 }
3305
3306 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3307 {
3308         struct sk_buff *skb;
3309         struct sadb_msg *hdr;
3310         struct sadb_sa *sa;
3311         struct sadb_address *addr;
3312         struct sadb_x_nat_t_port *n_port;
3313         int sockaddr_size;
3314         int size;
3315         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3316         struct xfrm_encap_tmpl *natt = NULL;
3317
3318         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3319         if (!sockaddr_size)
3320                 return -EINVAL;
3321
3322         if (!satype)
3323                 return -EINVAL;
3324
3325         if (!x->encap)
3326                 return -EINVAL;
3327
3328         natt = x->encap;
3329
3330         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3331          *
3332          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3333          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3334          */
3335
3336         size = sizeof(struct sadb_msg) +
3337                 sizeof(struct sadb_sa) +
3338                 (sizeof(struct sadb_address) * 2) +
3339                 (sockaddr_size * 2) +
3340                 (sizeof(struct sadb_x_nat_t_port) * 2);
3341
3342         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3343         if (skb == NULL)
3344                 return -ENOMEM;
3345
3346         hdr = skb_put(skb, sizeof(struct sadb_msg));
3347         hdr->sadb_msg_version = PF_KEY_V2;
3348         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3349         hdr->sadb_msg_satype = satype;
3350         hdr->sadb_msg_len = size / sizeof(uint64_t);
3351         hdr->sadb_msg_errno = 0;
3352         hdr->sadb_msg_reserved = 0;
3353         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3354         hdr->sadb_msg_pid = 0;
3355
3356         /* SA */
3357         sa = skb_put(skb, sizeof(struct sadb_sa));
3358         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3359         sa->sadb_sa_exttype = SADB_EXT_SA;
3360         sa->sadb_sa_spi = x->id.spi;
3361         sa->sadb_sa_replay = 0;
3362         sa->sadb_sa_state = 0;
3363         sa->sadb_sa_auth = 0;
3364         sa->sadb_sa_encrypt = 0;
3365         sa->sadb_sa_flags = 0;
3366
3367         /* ADDRESS_SRC (old addr) */
3368         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3369         addr->sadb_address_len =
3370                 (sizeof(struct sadb_address)+sockaddr_size)/
3371                         sizeof(uint64_t);
3372         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3373         addr->sadb_address_proto = 0;
3374         addr->sadb_address_reserved = 0;
3375         addr->sadb_address_prefixlen =
3376                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3377                                     (struct sockaddr *) (addr + 1),
3378                                     x->props.family);
3379         if (!addr->sadb_address_prefixlen)
3380                 BUG();
3381
3382         /* NAT_T_SPORT (old port) */
3383         n_port = skb_put(skb, sizeof(*n_port));
3384         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3385         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3386         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3387         n_port->sadb_x_nat_t_port_reserved = 0;
3388
3389         /* ADDRESS_DST (new addr) */
3390         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3391         addr->sadb_address_len =
3392                 (sizeof(struct sadb_address)+sockaddr_size)/
3393                         sizeof(uint64_t);
3394         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3395         addr->sadb_address_proto = 0;
3396         addr->sadb_address_reserved = 0;
3397         addr->sadb_address_prefixlen =
3398                 pfkey_sockaddr_fill(ipaddr, 0,
3399                                     (struct sockaddr *) (addr + 1),
3400                                     x->props.family);
3401         if (!addr->sadb_address_prefixlen)
3402                 BUG();
3403
3404         /* NAT_T_DPORT (new port) */
3405         n_port = skb_put(skb, sizeof(*n_port));
3406         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3407         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3408         n_port->sadb_x_nat_t_port_port = sport;
3409         n_port->sadb_x_nat_t_port_reserved = 0;
3410
3411         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3412 }
3413
3414 #ifdef CONFIG_NET_KEY_MIGRATE
3415 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3416                             const struct xfrm_selector *sel)
3417 {
3418         struct sadb_address *addr;
3419         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3420         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3421         addr->sadb_address_exttype = type;
3422         addr->sadb_address_proto = sel->proto;
3423         addr->sadb_address_reserved = 0;
3424
3425         switch (type) {
3426         case SADB_EXT_ADDRESS_SRC:
3427                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3428                 pfkey_sockaddr_fill(&sel->saddr, 0,
3429                                     (struct sockaddr *)(addr + 1),
3430                                     sel->family);
3431                 break;
3432         case SADB_EXT_ADDRESS_DST:
3433                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3434                 pfkey_sockaddr_fill(&sel->daddr, 0,
3435                                     (struct sockaddr *)(addr + 1),
3436                                     sel->family);
3437                 break;
3438         default:
3439                 return -EINVAL;
3440         }
3441
3442         return 0;
3443 }
3444
3445
3446 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3447 {
3448         struct sadb_x_kmaddress *kma;
3449         u8 *sa;
3450         int family = k->family;
3451         int socklen = pfkey_sockaddr_len(family);
3452         int size_req;
3453
3454         size_req = (sizeof(struct sadb_x_kmaddress) +
3455                     pfkey_sockaddr_pair_size(family));
3456
3457         kma = skb_put_zero(skb, size_req);
3458         kma->sadb_x_kmaddress_len = size_req / 8;
3459         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3460         kma->sadb_x_kmaddress_reserved = k->reserved;
3461
3462         sa = (u8 *)(kma + 1);
3463         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3464             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3465                 return -EINVAL;
3466
3467         return 0;
3468 }
3469
3470 static int set_ipsecrequest(struct sk_buff *skb,
3471                             uint8_t proto, uint8_t mode, int level,
3472                             uint32_t reqid, uint8_t family,
3473                             const xfrm_address_t *src, const xfrm_address_t *dst)
3474 {
3475         struct sadb_x_ipsecrequest *rq;
3476         u8 *sa;
3477         int socklen = pfkey_sockaddr_len(family);
3478         int size_req;
3479
3480         size_req = sizeof(struct sadb_x_ipsecrequest) +
3481                    pfkey_sockaddr_pair_size(family);
3482
3483         rq = skb_put_zero(skb, size_req);
3484         rq->sadb_x_ipsecrequest_len = size_req;
3485         rq->sadb_x_ipsecrequest_proto = proto;
3486         rq->sadb_x_ipsecrequest_mode = mode;
3487         rq->sadb_x_ipsecrequest_level = level;
3488         rq->sadb_x_ipsecrequest_reqid = reqid;
3489
3490         sa = (u8 *) (rq + 1);
3491         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3492             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3493                 return -EINVAL;
3494
3495         return 0;
3496 }
3497 #endif
3498
3499 #ifdef CONFIG_NET_KEY_MIGRATE
3500 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3501                               const struct xfrm_migrate *m, int num_bundles,
3502                               const struct xfrm_kmaddress *k,
3503                               const struct xfrm_encap_tmpl *encap)
3504 {
3505         int i;
3506         int sasize_sel;
3507         int size = 0;
3508         int size_pol = 0;
3509         struct sk_buff *skb;
3510         struct sadb_msg *hdr;
3511         struct sadb_x_policy *pol;
3512         const struct xfrm_migrate *mp;
3513
3514         if (type != XFRM_POLICY_TYPE_MAIN)
3515                 return 0;
3516
3517         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3518                 return -EINVAL;
3519
3520         if (k != NULL) {
3521                 /* addresses for KM */
3522                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3523                                      pfkey_sockaddr_pair_size(k->family));
3524         }
3525
3526         /* selector */
3527         sasize_sel = pfkey_sockaddr_size(sel->family);
3528         if (!sasize_sel)
3529                 return -EINVAL;
3530         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3531
3532         /* policy info */
3533         size_pol += sizeof(struct sadb_x_policy);
3534
3535         /* ipsecrequests */
3536         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3537                 /* old locator pair */
3538                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3539                             pfkey_sockaddr_pair_size(mp->old_family);
3540                 /* new locator pair */
3541                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3542                             pfkey_sockaddr_pair_size(mp->new_family);
3543         }
3544
3545         size += sizeof(struct sadb_msg) + size_pol;
3546
3547         /* alloc buffer */
3548         skb = alloc_skb(size, GFP_ATOMIC);
3549         if (skb == NULL)
3550                 return -ENOMEM;
3551
3552         hdr = skb_put(skb, sizeof(struct sadb_msg));
3553         hdr->sadb_msg_version = PF_KEY_V2;
3554         hdr->sadb_msg_type = SADB_X_MIGRATE;
3555         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3556         hdr->sadb_msg_len = size / 8;
3557         hdr->sadb_msg_errno = 0;
3558         hdr->sadb_msg_reserved = 0;
3559         hdr->sadb_msg_seq = 0;
3560         hdr->sadb_msg_pid = 0;
3561
3562         /* Addresses to be used by KM for negotiation, if ext is available */
3563         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3564                 goto err;
3565
3566         /* selector src */
3567         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3568
3569         /* selector dst */
3570         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3571
3572         /* policy information */
3573         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3574         pol->sadb_x_policy_len = size_pol / 8;
3575         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3576         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3577         pol->sadb_x_policy_dir = dir + 1;
3578         pol->sadb_x_policy_reserved = 0;
3579         pol->sadb_x_policy_id = 0;
3580         pol->sadb_x_policy_priority = 0;
3581
3582         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3583                 /* old ipsecrequest */
3584                 int mode = pfkey_mode_from_xfrm(mp->mode);
3585                 if (mode < 0)
3586                         goto err;
3587                 if (set_ipsecrequest(skb, mp->proto, mode,
3588                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3589                                      mp->reqid, mp->old_family,
3590                                      &mp->old_saddr, &mp->old_daddr) < 0)
3591                         goto err;
3592
3593                 /* new ipsecrequest */
3594                 if (set_ipsecrequest(skb, mp->proto, mode,
3595                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3596                                      mp->reqid, mp->new_family,
3597                                      &mp->new_saddr, &mp->new_daddr) < 0)
3598                         goto err;
3599         }
3600
3601         /* broadcast migrate message to sockets */
3602         pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3603
3604         return 0;
3605
3606 err:
3607         kfree_skb(skb);
3608         return -EINVAL;
3609 }
3610 #else
3611 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3612                               const struct xfrm_migrate *m, int num_bundles,
3613                               const struct xfrm_kmaddress *k,
3614                               const struct xfrm_encap_tmpl *encap)
3615 {
3616         return -ENOPROTOOPT;
3617 }
3618 #endif
3619
3620 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3621 {
3622         struct sock *sk = sock->sk;
3623         struct sk_buff *skb = NULL;
3624         struct sadb_msg *hdr = NULL;
3625         int err;
3626         struct net *net = sock_net(sk);
3627
3628         err = -EOPNOTSUPP;
3629         if (msg->msg_flags & MSG_OOB)
3630                 goto out;
3631
3632         err = -EMSGSIZE;
3633         if ((unsigned int)len > sk->sk_sndbuf - 32)
3634                 goto out;
3635
3636         err = -ENOBUFS;
3637         skb = alloc_skb(len, GFP_KERNEL);
3638         if (skb == NULL)
3639                 goto out;
3640
3641         err = -EFAULT;
3642         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3643                 goto out;
3644
3645         hdr = pfkey_get_base_msg(skb, &err);
3646         if (!hdr)
3647                 goto out;
3648
3649         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3650         err = pfkey_process(sk, skb, hdr);
3651         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3652
3653 out:
3654         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3655                 err = 0;
3656         kfree_skb(skb);
3657
3658         return err ? : len;
3659 }
3660
3661 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3662                          int flags)
3663 {
3664         struct sock *sk = sock->sk;
3665         struct pfkey_sock *pfk = pfkey_sk(sk);
3666         struct sk_buff *skb;
3667         int copied, err;
3668
3669         err = -EINVAL;
3670         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3671                 goto out;
3672
3673         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3674         if (skb == NULL)
3675                 goto out;
3676
3677         copied = skb->len;
3678         if (copied > len) {
3679                 msg->msg_flags |= MSG_TRUNC;
3680                 copied = len;
3681         }
3682
3683         skb_reset_transport_header(skb);
3684         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3685         if (err)
3686                 goto out_free;
3687
3688         sock_recv_ts_and_drops(msg, sk, skb);
3689
3690         err = (flags & MSG_TRUNC) ? skb->len : copied;
3691
3692         if (pfk->dump.dump != NULL &&
3693             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3694                 pfkey_do_dump(pfk);
3695
3696 out_free:
3697         skb_free_datagram(sk, skb);
3698 out:
3699         return err;
3700 }
3701
3702 static const struct proto_ops pfkey_ops = {
3703         .family         =       PF_KEY,
3704         .owner          =       THIS_MODULE,
3705         /* Operations that make no sense on pfkey sockets. */
3706         .bind           =       sock_no_bind,
3707         .connect        =       sock_no_connect,
3708         .socketpair     =       sock_no_socketpair,
3709         .accept         =       sock_no_accept,
3710         .getname        =       sock_no_getname,
3711         .ioctl          =       sock_no_ioctl,
3712         .listen         =       sock_no_listen,
3713         .shutdown       =       sock_no_shutdown,
3714         .setsockopt     =       sock_no_setsockopt,
3715         .getsockopt     =       sock_no_getsockopt,
3716         .mmap           =       sock_no_mmap,
3717         .sendpage       =       sock_no_sendpage,
3718
3719         /* Now the operations that really occur. */
3720         .release        =       pfkey_release,
3721         .poll           =       datagram_poll,
3722         .sendmsg        =       pfkey_sendmsg,
3723         .recvmsg        =       pfkey_recvmsg,
3724 };
3725
3726 static const struct net_proto_family pfkey_family_ops = {
3727         .family =       PF_KEY,
3728         .create =       pfkey_create,
3729         .owner  =       THIS_MODULE,
3730 };
3731
3732 #ifdef CONFIG_PROC_FS
3733 static int pfkey_seq_show(struct seq_file *f, void *v)
3734 {
3735         struct sock *s = sk_entry(v);
3736
3737         if (v == SEQ_START_TOKEN)
3738                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3739         else
3740                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3741                                s,
3742                                refcount_read(&s->sk_refcnt),
3743                                sk_rmem_alloc_get(s),
3744                                sk_wmem_alloc_get(s),
3745                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3746                                sock_i_ino(s)
3747                                );
3748         return 0;
3749 }
3750
3751 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3752         __acquires(rcu)
3753 {
3754         struct net *net = seq_file_net(f);
3755         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3756
3757         rcu_read_lock();
3758         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3759 }
3760
3761 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3762 {
3763         struct net *net = seq_file_net(f);
3764         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3765
3766         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3767 }
3768
3769 static void pfkey_seq_stop(struct seq_file *f, void *v)
3770         __releases(rcu)
3771 {
3772         rcu_read_unlock();
3773 }
3774
3775 static const struct seq_operations pfkey_seq_ops = {
3776         .start  = pfkey_seq_start,
3777         .next   = pfkey_seq_next,
3778         .stop   = pfkey_seq_stop,
3779         .show   = pfkey_seq_show,
3780 };
3781
3782 static int pfkey_seq_open(struct inode *inode, struct file *file)
3783 {
3784         return seq_open_net(inode, file, &pfkey_seq_ops,
3785                             sizeof(struct seq_net_private));
3786 }
3787
3788 static const struct file_operations pfkey_proc_ops = {
3789         .open    = pfkey_seq_open,
3790         .read    = seq_read,
3791         .llseek  = seq_lseek,
3792         .release = seq_release_net,
3793 };
3794
3795 static int __net_init pfkey_init_proc(struct net *net)
3796 {
3797         struct proc_dir_entry *e;
3798
3799         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3800         if (e == NULL)
3801                 return -ENOMEM;
3802
3803         return 0;
3804 }
3805
3806 static void __net_exit pfkey_exit_proc(struct net *net)
3807 {
3808         remove_proc_entry("pfkey", net->proc_net);
3809 }
3810 #else
3811 static inline int pfkey_init_proc(struct net *net)
3812 {
3813         return 0;
3814 }
3815
3816 static inline void pfkey_exit_proc(struct net *net)
3817 {
3818 }
3819 #endif
3820
3821 static struct xfrm_mgr pfkeyv2_mgr =
3822 {
3823         .notify         = pfkey_send_notify,
3824         .acquire        = pfkey_send_acquire,
3825         .compile_policy = pfkey_compile_policy,
3826         .new_mapping    = pfkey_send_new_mapping,
3827         .notify_policy  = pfkey_send_policy_notify,
3828         .migrate        = pfkey_send_migrate,
3829         .is_alive       = pfkey_is_alive,
3830 };
3831
3832 static int __net_init pfkey_net_init(struct net *net)
3833 {
3834         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3835         int rv;
3836
3837         INIT_HLIST_HEAD(&net_pfkey->table);
3838         atomic_set(&net_pfkey->socks_nr, 0);
3839
3840         rv = pfkey_init_proc(net);
3841
3842         return rv;
3843 }
3844
3845 static void __net_exit pfkey_net_exit(struct net *net)
3846 {
3847         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3848
3849         pfkey_exit_proc(net);
3850         BUG_ON(!hlist_empty(&net_pfkey->table));
3851 }
3852
3853 static struct pernet_operations pfkey_net_ops = {
3854         .init = pfkey_net_init,
3855         .exit = pfkey_net_exit,
3856         .id   = &pfkey_net_id,
3857         .size = sizeof(struct netns_pfkey),
3858 };
3859
3860 static void __exit ipsec_pfkey_exit(void)
3861 {
3862         xfrm_unregister_km(&pfkeyv2_mgr);
3863         sock_unregister(PF_KEY);
3864         unregister_pernet_subsys(&pfkey_net_ops);
3865         proto_unregister(&key_proto);
3866 }
3867
3868 static int __init ipsec_pfkey_init(void)
3869 {
3870         int err = proto_register(&key_proto, 0);
3871
3872         if (err != 0)
3873                 goto out;
3874
3875         err = register_pernet_subsys(&pfkey_net_ops);
3876         if (err != 0)
3877                 goto out_unregister_key_proto;
3878         err = sock_register(&pfkey_family_ops);
3879         if (err != 0)
3880                 goto out_unregister_pernet;
3881         err = xfrm_register_km(&pfkeyv2_mgr);
3882         if (err != 0)
3883                 goto out_sock_unregister;
3884 out:
3885         return err;
3886
3887 out_sock_unregister:
3888         sock_unregister(PF_KEY);
3889 out_unregister_pernet:
3890         unregister_pernet_subsys(&pfkey_net_ops);
3891 out_unregister_key_proto:
3892         proto_unregister(&key_proto);
3893         goto out;
3894 }
3895
3896 module_init(ipsec_pfkey_init);
3897 module_exit(ipsec_pfkey_exit);
3898 MODULE_LICENSE("GPL");
3899 MODULE_ALIAS_NETPROTO(PF_KEY);