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